xref: /openbmc/linux/net/netfilter/nf_tables_api.c (revision f24d8abc)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
4  *
5  * Development of this code funded by Astaro AG (http://www.astaro.com/)
6  */
7 
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/list.h>
11 #include <linux/skbuff.h>
12 #include <linux/netlink.h>
13 #include <linux/vmalloc.h>
14 #include <linux/rhashtable.h>
15 #include <linux/audit.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_flow_table.h>
20 #include <net/netfilter/nf_tables_core.h>
21 #include <net/netfilter/nf_tables.h>
22 #include <net/netfilter/nf_tables_offload.h>
23 #include <net/net_namespace.h>
24 #include <net/sock.h>
25 
26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
27 #define NFT_SET_MAX_ANONLEN 16
28 
29 unsigned int nf_tables_net_id __read_mostly;
30 
31 static LIST_HEAD(nf_tables_expressions);
32 static LIST_HEAD(nf_tables_objects);
33 static LIST_HEAD(nf_tables_flowtables);
34 static LIST_HEAD(nf_tables_destroy_list);
35 static LIST_HEAD(nf_tables_gc_list);
36 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
37 static DEFINE_SPINLOCK(nf_tables_gc_list_lock);
38 
39 enum {
40 	NFT_VALIDATE_SKIP	= 0,
41 	NFT_VALIDATE_NEED,
42 	NFT_VALIDATE_DO,
43 };
44 
45 static struct rhltable nft_objname_ht;
46 
47 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
48 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
49 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
50 
51 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
52 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
53 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
54 
55 static const struct rhashtable_params nft_chain_ht_params = {
56 	.head_offset		= offsetof(struct nft_chain, rhlhead),
57 	.key_offset		= offsetof(struct nft_chain, name),
58 	.hashfn			= nft_chain_hash,
59 	.obj_hashfn		= nft_chain_hash_obj,
60 	.obj_cmpfn		= nft_chain_hash_cmp,
61 	.automatic_shrinking	= true,
62 };
63 
64 static const struct rhashtable_params nft_objname_ht_params = {
65 	.head_offset		= offsetof(struct nft_object, rhlhead),
66 	.key_offset		= offsetof(struct nft_object, key),
67 	.hashfn			= nft_objname_hash,
68 	.obj_hashfn		= nft_objname_hash_obj,
69 	.obj_cmpfn		= nft_objname_hash_cmp,
70 	.automatic_shrinking	= true,
71 };
72 
73 struct nft_audit_data {
74 	struct nft_table *table;
75 	int entries;
76 	int op;
77 	struct list_head list;
78 };
79 
80 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
81 	[NFT_MSG_NEWTABLE]	= AUDIT_NFT_OP_TABLE_REGISTER,
82 	[NFT_MSG_GETTABLE]	= AUDIT_NFT_OP_INVALID,
83 	[NFT_MSG_DELTABLE]	= AUDIT_NFT_OP_TABLE_UNREGISTER,
84 	[NFT_MSG_NEWCHAIN]	= AUDIT_NFT_OP_CHAIN_REGISTER,
85 	[NFT_MSG_GETCHAIN]	= AUDIT_NFT_OP_INVALID,
86 	[NFT_MSG_DELCHAIN]	= AUDIT_NFT_OP_CHAIN_UNREGISTER,
87 	[NFT_MSG_NEWRULE]	= AUDIT_NFT_OP_RULE_REGISTER,
88 	[NFT_MSG_GETRULE]	= AUDIT_NFT_OP_INVALID,
89 	[NFT_MSG_DELRULE]	= AUDIT_NFT_OP_RULE_UNREGISTER,
90 	[NFT_MSG_NEWSET]	= AUDIT_NFT_OP_SET_REGISTER,
91 	[NFT_MSG_GETSET]	= AUDIT_NFT_OP_INVALID,
92 	[NFT_MSG_DELSET]	= AUDIT_NFT_OP_SET_UNREGISTER,
93 	[NFT_MSG_NEWSETELEM]	= AUDIT_NFT_OP_SETELEM_REGISTER,
94 	[NFT_MSG_GETSETELEM]	= AUDIT_NFT_OP_INVALID,
95 	[NFT_MSG_DELSETELEM]	= AUDIT_NFT_OP_SETELEM_UNREGISTER,
96 	[NFT_MSG_NEWGEN]	= AUDIT_NFT_OP_GEN_REGISTER,
97 	[NFT_MSG_GETGEN]	= AUDIT_NFT_OP_INVALID,
98 	[NFT_MSG_TRACE]		= AUDIT_NFT_OP_INVALID,
99 	[NFT_MSG_NEWOBJ]	= AUDIT_NFT_OP_OBJ_REGISTER,
100 	[NFT_MSG_GETOBJ]	= AUDIT_NFT_OP_INVALID,
101 	[NFT_MSG_DELOBJ]	= AUDIT_NFT_OP_OBJ_UNREGISTER,
102 	[NFT_MSG_GETOBJ_RESET]	= AUDIT_NFT_OP_OBJ_RESET,
103 	[NFT_MSG_NEWFLOWTABLE]	= AUDIT_NFT_OP_FLOWTABLE_REGISTER,
104 	[NFT_MSG_GETFLOWTABLE]	= AUDIT_NFT_OP_INVALID,
105 	[NFT_MSG_DELFLOWTABLE]	= AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
106 	[NFT_MSG_GETSETELEM_RESET] = AUDIT_NFT_OP_SETELEM_RESET,
107 };
108 
nft_validate_state_update(struct nft_table * table,u8 new_validate_state)109 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
110 {
111 	switch (table->validate_state) {
112 	case NFT_VALIDATE_SKIP:
113 		WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
114 		break;
115 	case NFT_VALIDATE_NEED:
116 		break;
117 	case NFT_VALIDATE_DO:
118 		if (new_validate_state == NFT_VALIDATE_NEED)
119 			return;
120 	}
121 
122 	table->validate_state = new_validate_state;
123 }
124 static void nf_tables_trans_destroy_work(struct work_struct *w);
125 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
126 
127 static void nft_trans_gc_work(struct work_struct *work);
128 static DECLARE_WORK(trans_gc_work, nft_trans_gc_work);
129 
nft_ctx_init(struct nft_ctx * ctx,struct net * net,const struct sk_buff * skb,const struct nlmsghdr * nlh,u8 family,struct nft_table * table,struct nft_chain * chain,const struct nlattr * const * nla)130 static void nft_ctx_init(struct nft_ctx *ctx,
131 			 struct net *net,
132 			 const struct sk_buff *skb,
133 			 const struct nlmsghdr *nlh,
134 			 u8 family,
135 			 struct nft_table *table,
136 			 struct nft_chain *chain,
137 			 const struct nlattr * const *nla)
138 {
139 	ctx->net	= net;
140 	ctx->family	= family;
141 	ctx->level	= 0;
142 	ctx->table	= table;
143 	ctx->chain	= chain;
144 	ctx->nla   	= nla;
145 	ctx->portid	= NETLINK_CB(skb).portid;
146 	ctx->report	= nlmsg_report(nlh);
147 	ctx->flags	= nlh->nlmsg_flags;
148 	ctx->seq	= nlh->nlmsg_seq;
149 }
150 
nft_trans_alloc_gfp(const struct nft_ctx * ctx,int msg_type,u32 size,gfp_t gfp)151 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
152 					     int msg_type, u32 size, gfp_t gfp)
153 {
154 	struct nft_trans *trans;
155 
156 	trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
157 	if (trans == NULL)
158 		return NULL;
159 
160 	INIT_LIST_HEAD(&trans->list);
161 	INIT_LIST_HEAD(&trans->binding_list);
162 	trans->msg_type = msg_type;
163 	trans->ctx	= *ctx;
164 
165 	return trans;
166 }
167 
nft_trans_alloc(const struct nft_ctx * ctx,int msg_type,u32 size)168 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
169 					 int msg_type, u32 size)
170 {
171 	return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
172 }
173 
nft_trans_list_del(struct nft_trans * trans)174 static void nft_trans_list_del(struct nft_trans *trans)
175 {
176 	list_del(&trans->list);
177 	list_del(&trans->binding_list);
178 }
179 
nft_trans_destroy(struct nft_trans * trans)180 static void nft_trans_destroy(struct nft_trans *trans)
181 {
182 	nft_trans_list_del(trans);
183 	kfree(trans);
184 }
185 
__nft_set_trans_bind(const struct nft_ctx * ctx,struct nft_set * set,bool bind)186 static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
187 				 bool bind)
188 {
189 	struct nftables_pernet *nft_net;
190 	struct net *net = ctx->net;
191 	struct nft_trans *trans;
192 
193 	if (!nft_set_is_anonymous(set))
194 		return;
195 
196 	nft_net = nft_pernet(net);
197 	list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
198 		switch (trans->msg_type) {
199 		case NFT_MSG_NEWSET:
200 			if (nft_trans_set(trans) == set)
201 				nft_trans_set_bound(trans) = bind;
202 			break;
203 		case NFT_MSG_NEWSETELEM:
204 			if (nft_trans_elem_set(trans) == set)
205 				nft_trans_elem_set_bound(trans) = bind;
206 			break;
207 		}
208 	}
209 }
210 
nft_set_trans_bind(const struct nft_ctx * ctx,struct nft_set * set)211 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
212 {
213 	return __nft_set_trans_bind(ctx, set, true);
214 }
215 
nft_set_trans_unbind(const struct nft_ctx * ctx,struct nft_set * set)216 static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
217 {
218 	return __nft_set_trans_bind(ctx, set, false);
219 }
220 
__nft_chain_trans_bind(const struct nft_ctx * ctx,struct nft_chain * chain,bool bind)221 static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
222 				   struct nft_chain *chain, bool bind)
223 {
224 	struct nftables_pernet *nft_net;
225 	struct net *net = ctx->net;
226 	struct nft_trans *trans;
227 
228 	if (!nft_chain_binding(chain))
229 		return;
230 
231 	nft_net = nft_pernet(net);
232 	list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
233 		switch (trans->msg_type) {
234 		case NFT_MSG_NEWCHAIN:
235 			if (nft_trans_chain(trans) == chain)
236 				nft_trans_chain_bound(trans) = bind;
237 			break;
238 		case NFT_MSG_NEWRULE:
239 			if (trans->ctx.chain == chain)
240 				nft_trans_rule_bound(trans) = bind;
241 			break;
242 		}
243 	}
244 }
245 
nft_chain_trans_bind(const struct nft_ctx * ctx,struct nft_chain * chain)246 static void nft_chain_trans_bind(const struct nft_ctx *ctx,
247 				 struct nft_chain *chain)
248 {
249 	__nft_chain_trans_bind(ctx, chain, true);
250 }
251 
nf_tables_bind_chain(const struct nft_ctx * ctx,struct nft_chain * chain)252 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
253 {
254 	if (!nft_chain_binding(chain))
255 		return 0;
256 
257 	if (nft_chain_binding(ctx->chain))
258 		return -EOPNOTSUPP;
259 
260 	if (chain->bound)
261 		return -EBUSY;
262 
263 	if (!nft_use_inc(&chain->use))
264 		return -EMFILE;
265 
266 	chain->bound = true;
267 	nft_chain_trans_bind(ctx, chain);
268 
269 	return 0;
270 }
271 
nf_tables_unbind_chain(const struct nft_ctx * ctx,struct nft_chain * chain)272 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
273 {
274 	__nft_chain_trans_bind(ctx, chain, false);
275 }
276 
nft_netdev_register_hooks(struct net * net,struct list_head * hook_list)277 static int nft_netdev_register_hooks(struct net *net,
278 				     struct list_head *hook_list)
279 {
280 	struct nft_hook *hook;
281 	int err, j;
282 
283 	j = 0;
284 	list_for_each_entry(hook, hook_list, list) {
285 		err = nf_register_net_hook(net, &hook->ops);
286 		if (err < 0)
287 			goto err_register;
288 
289 		j++;
290 	}
291 	return 0;
292 
293 err_register:
294 	list_for_each_entry(hook, hook_list, list) {
295 		if (j-- <= 0)
296 			break;
297 
298 		nf_unregister_net_hook(net, &hook->ops);
299 	}
300 	return err;
301 }
302 
nft_netdev_unregister_hooks(struct net * net,struct list_head * hook_list,bool release_netdev)303 static void nft_netdev_unregister_hooks(struct net *net,
304 					struct list_head *hook_list,
305 					bool release_netdev)
306 {
307 	struct nft_hook *hook, *next;
308 
309 	list_for_each_entry_safe(hook, next, hook_list, list) {
310 		nf_unregister_net_hook(net, &hook->ops);
311 		if (release_netdev) {
312 			list_del(&hook->list);
313 			kfree_rcu(hook, rcu);
314 		}
315 	}
316 }
317 
nf_tables_register_hook(struct net * net,const struct nft_table * table,struct nft_chain * chain)318 static int nf_tables_register_hook(struct net *net,
319 				   const struct nft_table *table,
320 				   struct nft_chain *chain)
321 {
322 	struct nft_base_chain *basechain;
323 	const struct nf_hook_ops *ops;
324 
325 	if (table->flags & NFT_TABLE_F_DORMANT ||
326 	    !nft_is_base_chain(chain))
327 		return 0;
328 
329 	basechain = nft_base_chain(chain);
330 	ops = &basechain->ops;
331 
332 	if (basechain->type->ops_register)
333 		return basechain->type->ops_register(net, ops);
334 
335 	if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
336 		return nft_netdev_register_hooks(net, &basechain->hook_list);
337 
338 	return nf_register_net_hook(net, &basechain->ops);
339 }
340 
__nf_tables_unregister_hook(struct net * net,const struct nft_table * table,struct nft_chain * chain,bool release_netdev)341 static void __nf_tables_unregister_hook(struct net *net,
342 					const struct nft_table *table,
343 					struct nft_chain *chain,
344 					bool release_netdev)
345 {
346 	struct nft_base_chain *basechain;
347 	const struct nf_hook_ops *ops;
348 
349 	if (table->flags & NFT_TABLE_F_DORMANT ||
350 	    !nft_is_base_chain(chain))
351 		return;
352 	basechain = nft_base_chain(chain);
353 	ops = &basechain->ops;
354 
355 	if (basechain->type->ops_unregister)
356 		return basechain->type->ops_unregister(net, ops);
357 
358 	if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
359 		nft_netdev_unregister_hooks(net, &basechain->hook_list,
360 					    release_netdev);
361 	else
362 		nf_unregister_net_hook(net, &basechain->ops);
363 }
364 
nf_tables_unregister_hook(struct net * net,const struct nft_table * table,struct nft_chain * chain)365 static void nf_tables_unregister_hook(struct net *net,
366 				      const struct nft_table *table,
367 				      struct nft_chain *chain)
368 {
369 	return __nf_tables_unregister_hook(net, table, chain, false);
370 }
371 
nft_trans_commit_list_add_tail(struct net * net,struct nft_trans * trans)372 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
373 {
374 	struct nftables_pernet *nft_net = nft_pernet(net);
375 
376 	switch (trans->msg_type) {
377 	case NFT_MSG_NEWSET:
378 		if (!nft_trans_set_update(trans) &&
379 		    nft_set_is_anonymous(nft_trans_set(trans)))
380 			list_add_tail(&trans->binding_list, &nft_net->binding_list);
381 		break;
382 	case NFT_MSG_NEWCHAIN:
383 		if (!nft_trans_chain_update(trans) &&
384 		    nft_chain_binding(nft_trans_chain(trans)))
385 			list_add_tail(&trans->binding_list, &nft_net->binding_list);
386 		break;
387 	}
388 
389 	list_add_tail(&trans->list, &nft_net->commit_list);
390 }
391 
nft_trans_table_add(struct nft_ctx * ctx,int msg_type)392 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
393 {
394 	struct nft_trans *trans;
395 
396 	trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
397 	if (trans == NULL)
398 		return -ENOMEM;
399 
400 	if (msg_type == NFT_MSG_NEWTABLE)
401 		nft_activate_next(ctx->net, ctx->table);
402 
403 	nft_trans_commit_list_add_tail(ctx->net, trans);
404 	return 0;
405 }
406 
nft_deltable(struct nft_ctx * ctx)407 static int nft_deltable(struct nft_ctx *ctx)
408 {
409 	int err;
410 
411 	err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
412 	if (err < 0)
413 		return err;
414 
415 	nft_deactivate_next(ctx->net, ctx->table);
416 	return err;
417 }
418 
nft_trans_chain_add(struct nft_ctx * ctx,int msg_type)419 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
420 {
421 	struct nft_trans *trans;
422 
423 	trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
424 	if (trans == NULL)
425 		return ERR_PTR(-ENOMEM);
426 
427 	if (msg_type == NFT_MSG_NEWCHAIN) {
428 		nft_activate_next(ctx->net, ctx->chain);
429 
430 		if (ctx->nla[NFTA_CHAIN_ID]) {
431 			nft_trans_chain_id(trans) =
432 				ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
433 		}
434 	}
435 	nft_trans_chain(trans) = ctx->chain;
436 	nft_trans_commit_list_add_tail(ctx->net, trans);
437 
438 	return trans;
439 }
440 
nft_delchain(struct nft_ctx * ctx)441 static int nft_delchain(struct nft_ctx *ctx)
442 {
443 	struct nft_trans *trans;
444 
445 	trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
446 	if (IS_ERR(trans))
447 		return PTR_ERR(trans);
448 
449 	nft_use_dec(&ctx->table->use);
450 	nft_deactivate_next(ctx->net, ctx->chain);
451 
452 	return 0;
453 }
454 
nft_rule_expr_activate(const struct nft_ctx * ctx,struct nft_rule * rule)455 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
456 {
457 	struct nft_expr *expr;
458 
459 	expr = nft_expr_first(rule);
460 	while (nft_expr_more(rule, expr)) {
461 		if (expr->ops->activate)
462 			expr->ops->activate(ctx, expr);
463 
464 		expr = nft_expr_next(expr);
465 	}
466 }
467 
nft_rule_expr_deactivate(const struct nft_ctx * ctx,struct nft_rule * rule,enum nft_trans_phase phase)468 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
469 			      enum nft_trans_phase phase)
470 {
471 	struct nft_expr *expr;
472 
473 	expr = nft_expr_first(rule);
474 	while (nft_expr_more(rule, expr)) {
475 		if (expr->ops->deactivate)
476 			expr->ops->deactivate(ctx, expr, phase);
477 
478 		expr = nft_expr_next(expr);
479 	}
480 }
481 
482 static int
nf_tables_delrule_deactivate(struct nft_ctx * ctx,struct nft_rule * rule)483 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
484 {
485 	/* You cannot delete the same rule twice */
486 	if (nft_is_active_next(ctx->net, rule)) {
487 		nft_deactivate_next(ctx->net, rule);
488 		nft_use_dec(&ctx->chain->use);
489 		return 0;
490 	}
491 	return -ENOENT;
492 }
493 
nft_trans_rule_add(struct nft_ctx * ctx,int msg_type,struct nft_rule * rule)494 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
495 					    struct nft_rule *rule)
496 {
497 	struct nft_trans *trans;
498 
499 	trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
500 	if (trans == NULL)
501 		return NULL;
502 
503 	if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
504 		nft_trans_rule_id(trans) =
505 			ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
506 	}
507 	nft_trans_rule(trans) = rule;
508 	nft_trans_commit_list_add_tail(ctx->net, trans);
509 
510 	return trans;
511 }
512 
nft_delrule(struct nft_ctx * ctx,struct nft_rule * rule)513 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
514 {
515 	struct nft_flow_rule *flow;
516 	struct nft_trans *trans;
517 	int err;
518 
519 	trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
520 	if (trans == NULL)
521 		return -ENOMEM;
522 
523 	if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
524 		flow = nft_flow_rule_create(ctx->net, rule);
525 		if (IS_ERR(flow)) {
526 			nft_trans_destroy(trans);
527 			return PTR_ERR(flow);
528 		}
529 
530 		nft_trans_flow_rule(trans) = flow;
531 	}
532 
533 	err = nf_tables_delrule_deactivate(ctx, rule);
534 	if (err < 0) {
535 		nft_trans_destroy(trans);
536 		return err;
537 	}
538 	nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
539 
540 	return 0;
541 }
542 
nft_delrule_by_chain(struct nft_ctx * ctx)543 static int nft_delrule_by_chain(struct nft_ctx *ctx)
544 {
545 	struct nft_rule *rule;
546 	int err;
547 
548 	list_for_each_entry(rule, &ctx->chain->rules, list) {
549 		if (!nft_is_active_next(ctx->net, rule))
550 			continue;
551 
552 		err = nft_delrule(ctx, rule);
553 		if (err < 0)
554 			return err;
555 	}
556 	return 0;
557 }
558 
__nft_trans_set_add(const struct nft_ctx * ctx,int msg_type,struct nft_set * set,const struct nft_set_desc * desc)559 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
560 			       struct nft_set *set,
561 			       const struct nft_set_desc *desc)
562 {
563 	struct nft_trans *trans;
564 
565 	trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
566 	if (trans == NULL)
567 		return -ENOMEM;
568 
569 	if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
570 		nft_trans_set_id(trans) =
571 			ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
572 		nft_activate_next(ctx->net, set);
573 	}
574 	nft_trans_set(trans) = set;
575 	if (desc) {
576 		nft_trans_set_update(trans) = true;
577 		nft_trans_set_gc_int(trans) = desc->gc_int;
578 		nft_trans_set_timeout(trans) = desc->timeout;
579 		nft_trans_set_size(trans) = desc->size;
580 	}
581 	nft_trans_commit_list_add_tail(ctx->net, trans);
582 
583 	return 0;
584 }
585 
nft_trans_set_add(const struct nft_ctx * ctx,int msg_type,struct nft_set * set)586 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
587 			     struct nft_set *set)
588 {
589 	return __nft_trans_set_add(ctx, msg_type, set, NULL);
590 }
591 
nft_mapelem_deactivate(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)592 static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
593 				  struct nft_set *set,
594 				  const struct nft_set_iter *iter,
595 				  struct nft_set_elem *elem)
596 {
597 	nft_setelem_data_deactivate(ctx->net, set, elem);
598 
599 	return 0;
600 }
601 
602 struct nft_set_elem_catchall {
603 	struct list_head	list;
604 	struct rcu_head		rcu;
605 	void			*elem;
606 };
607 
nft_map_catchall_deactivate(const struct nft_ctx * ctx,struct nft_set * set)608 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
609 					struct nft_set *set)
610 {
611 	u8 genmask = nft_genmask_next(ctx->net);
612 	struct nft_set_elem_catchall *catchall;
613 	struct nft_set_elem elem;
614 	struct nft_set_ext *ext;
615 
616 	list_for_each_entry(catchall, &set->catchall_list, list) {
617 		ext = nft_set_elem_ext(set, catchall->elem);
618 		if (!nft_set_elem_active(ext, genmask))
619 			continue;
620 
621 		elem.priv = catchall->elem;
622 		nft_setelem_data_deactivate(ctx->net, set, &elem);
623 		break;
624 	}
625 }
626 
nft_map_deactivate(const struct nft_ctx * ctx,struct nft_set * set)627 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
628 {
629 	struct nft_set_iter iter = {
630 		.genmask	= nft_genmask_next(ctx->net),
631 		.type		= NFT_ITER_UPDATE,
632 		.fn		= nft_mapelem_deactivate,
633 	};
634 
635 	set->ops->walk(ctx, set, &iter);
636 	WARN_ON_ONCE(iter.err);
637 
638 	nft_map_catchall_deactivate(ctx, set);
639 }
640 
nft_delset(const struct nft_ctx * ctx,struct nft_set * set)641 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
642 {
643 	int err;
644 
645 	err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
646 	if (err < 0)
647 		return err;
648 
649 	if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
650 		nft_map_deactivate(ctx, set);
651 
652 	nft_deactivate_next(ctx->net, set);
653 	nft_use_dec(&ctx->table->use);
654 
655 	return err;
656 }
657 
nft_trans_obj_add(struct nft_ctx * ctx,int msg_type,struct nft_object * obj)658 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
659 			     struct nft_object *obj)
660 {
661 	struct nft_trans *trans;
662 
663 	trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
664 	if (trans == NULL)
665 		return -ENOMEM;
666 
667 	if (msg_type == NFT_MSG_NEWOBJ)
668 		nft_activate_next(ctx->net, obj);
669 
670 	nft_trans_obj(trans) = obj;
671 	nft_trans_commit_list_add_tail(ctx->net, trans);
672 
673 	return 0;
674 }
675 
nft_delobj(struct nft_ctx * ctx,struct nft_object * obj)676 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
677 {
678 	int err;
679 
680 	err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
681 	if (err < 0)
682 		return err;
683 
684 	nft_deactivate_next(ctx->net, obj);
685 	nft_use_dec(&ctx->table->use);
686 
687 	return err;
688 }
689 
690 static struct nft_trans *
nft_trans_flowtable_add(struct nft_ctx * ctx,int msg_type,struct nft_flowtable * flowtable)691 nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
692 		        struct nft_flowtable *flowtable)
693 {
694 	struct nft_trans *trans;
695 
696 	trans = nft_trans_alloc(ctx, msg_type,
697 				sizeof(struct nft_trans_flowtable));
698 	if (trans == NULL)
699 		return ERR_PTR(-ENOMEM);
700 
701 	if (msg_type == NFT_MSG_NEWFLOWTABLE)
702 		nft_activate_next(ctx->net, flowtable);
703 
704 	INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
705 	nft_trans_flowtable(trans) = flowtable;
706 	nft_trans_commit_list_add_tail(ctx->net, trans);
707 
708 	return trans;
709 }
710 
nft_delflowtable(struct nft_ctx * ctx,struct nft_flowtable * flowtable)711 static int nft_delflowtable(struct nft_ctx *ctx,
712 			    struct nft_flowtable *flowtable)
713 {
714 	struct nft_trans *trans;
715 
716 	trans = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
717 	if (IS_ERR(trans))
718 		return PTR_ERR(trans);
719 
720 	nft_deactivate_next(ctx->net, flowtable);
721 	nft_use_dec(&ctx->table->use);
722 
723 	return 0;
724 }
725 
__nft_reg_track_clobber(struct nft_regs_track * track,u8 dreg)726 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
727 {
728 	int i;
729 
730 	for (i = track->regs[dreg].num_reg; i > 0; i--)
731 		__nft_reg_track_cancel(track, dreg - i);
732 }
733 
__nft_reg_track_update(struct nft_regs_track * track,const struct nft_expr * expr,u8 dreg,u8 num_reg)734 static void __nft_reg_track_update(struct nft_regs_track *track,
735 				   const struct nft_expr *expr,
736 				   u8 dreg, u8 num_reg)
737 {
738 	track->regs[dreg].selector = expr;
739 	track->regs[dreg].bitwise = NULL;
740 	track->regs[dreg].num_reg = num_reg;
741 }
742 
nft_reg_track_update(struct nft_regs_track * track,const struct nft_expr * expr,u8 dreg,u8 len)743 void nft_reg_track_update(struct nft_regs_track *track,
744 			  const struct nft_expr *expr, u8 dreg, u8 len)
745 {
746 	unsigned int regcount;
747 	int i;
748 
749 	__nft_reg_track_clobber(track, dreg);
750 
751 	regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
752 	for (i = 0; i < regcount; i++, dreg++)
753 		__nft_reg_track_update(track, expr, dreg, i);
754 }
755 EXPORT_SYMBOL_GPL(nft_reg_track_update);
756 
nft_reg_track_cancel(struct nft_regs_track * track,u8 dreg,u8 len)757 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
758 {
759 	unsigned int regcount;
760 	int i;
761 
762 	__nft_reg_track_clobber(track, dreg);
763 
764 	regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
765 	for (i = 0; i < regcount; i++, dreg++)
766 		__nft_reg_track_cancel(track, dreg);
767 }
768 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
769 
__nft_reg_track_cancel(struct nft_regs_track * track,u8 dreg)770 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
771 {
772 	track->regs[dreg].selector = NULL;
773 	track->regs[dreg].bitwise = NULL;
774 	track->regs[dreg].num_reg = 0;
775 }
776 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
777 
778 /*
779  * Tables
780  */
781 
nft_table_lookup(const struct net * net,const struct nlattr * nla,u8 family,u8 genmask,u32 nlpid)782 static struct nft_table *nft_table_lookup(const struct net *net,
783 					  const struct nlattr *nla,
784 					  u8 family, u8 genmask, u32 nlpid)
785 {
786 	struct nftables_pernet *nft_net;
787 	struct nft_table *table;
788 
789 	if (nla == NULL)
790 		return ERR_PTR(-EINVAL);
791 
792 	nft_net = nft_pernet(net);
793 	list_for_each_entry_rcu(table, &nft_net->tables, list,
794 				lockdep_is_held(&nft_net->commit_mutex)) {
795 		if (!nla_strcmp(nla, table->name) &&
796 		    table->family == family &&
797 		    nft_active_genmask(table, genmask)) {
798 			if (nft_table_has_owner(table) &&
799 			    nlpid && table->nlpid != nlpid)
800 				return ERR_PTR(-EPERM);
801 
802 			return table;
803 		}
804 	}
805 
806 	return ERR_PTR(-ENOENT);
807 }
808 
nft_table_lookup_byhandle(const struct net * net,const struct nlattr * nla,int family,u8 genmask,u32 nlpid)809 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
810 						   const struct nlattr *nla,
811 						   int family, u8 genmask, u32 nlpid)
812 {
813 	struct nftables_pernet *nft_net;
814 	struct nft_table *table;
815 
816 	nft_net = nft_pernet(net);
817 	list_for_each_entry(table, &nft_net->tables, list) {
818 		if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
819 		    table->family == family &&
820 		    nft_active_genmask(table, genmask)) {
821 			if (nft_table_has_owner(table) &&
822 			    nlpid && table->nlpid != nlpid)
823 				return ERR_PTR(-EPERM);
824 
825 			return table;
826 		}
827 	}
828 
829 	return ERR_PTR(-ENOENT);
830 }
831 
nf_tables_alloc_handle(struct nft_table * table)832 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
833 {
834 	return ++table->hgenerator;
835 }
836 
837 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
838 
839 static const struct nft_chain_type *
__nft_chain_type_get(u8 family,enum nft_chain_types type)840 __nft_chain_type_get(u8 family, enum nft_chain_types type)
841 {
842 	if (family >= NFPROTO_NUMPROTO ||
843 	    type >= NFT_CHAIN_T_MAX)
844 		return NULL;
845 
846 	return chain_type[family][type];
847 }
848 
849 static const struct nft_chain_type *
__nf_tables_chain_type_lookup(const struct nlattr * nla,u8 family)850 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
851 {
852 	const struct nft_chain_type *type;
853 	int i;
854 
855 	for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
856 		type = __nft_chain_type_get(family, i);
857 		if (!type)
858 			continue;
859 		if (!nla_strcmp(nla, type->name))
860 			return type;
861 	}
862 	return NULL;
863 }
864 
865 struct nft_module_request {
866 	struct list_head	list;
867 	char			module[MODULE_NAME_LEN];
868 	bool			done;
869 };
870 
871 #ifdef CONFIG_MODULES
nft_request_module(struct net * net,const char * fmt,...)872 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
873 				      ...)
874 {
875 	char module_name[MODULE_NAME_LEN];
876 	struct nftables_pernet *nft_net;
877 	struct nft_module_request *req;
878 	va_list args;
879 	int ret;
880 
881 	va_start(args, fmt);
882 	ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
883 	va_end(args);
884 	if (ret >= MODULE_NAME_LEN)
885 		return 0;
886 
887 	nft_net = nft_pernet(net);
888 	list_for_each_entry(req, &nft_net->module_list, list) {
889 		if (!strcmp(req->module, module_name)) {
890 			if (req->done)
891 				return 0;
892 
893 			/* A request to load this module already exists. */
894 			return -EAGAIN;
895 		}
896 	}
897 
898 	req = kmalloc(sizeof(*req), GFP_KERNEL);
899 	if (!req)
900 		return -ENOMEM;
901 
902 	req->done = false;
903 	strscpy(req->module, module_name, MODULE_NAME_LEN);
904 	list_add_tail(&req->list, &nft_net->module_list);
905 
906 	return -EAGAIN;
907 }
908 EXPORT_SYMBOL_GPL(nft_request_module);
909 #endif
910 
lockdep_nfnl_nft_mutex_not_held(void)911 static void lockdep_nfnl_nft_mutex_not_held(void)
912 {
913 #ifdef CONFIG_PROVE_LOCKING
914 	if (debug_locks)
915 		WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
916 #endif
917 }
918 
919 static const struct nft_chain_type *
nf_tables_chain_type_lookup(struct net * net,const struct nlattr * nla,u8 family,bool autoload)920 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
921 			    u8 family, bool autoload)
922 {
923 	const struct nft_chain_type *type;
924 
925 	type = __nf_tables_chain_type_lookup(nla, family);
926 	if (type != NULL)
927 		return type;
928 
929 	lockdep_nfnl_nft_mutex_not_held();
930 #ifdef CONFIG_MODULES
931 	if (autoload) {
932 		if (nft_request_module(net, "nft-chain-%u-%.*s", family,
933 				       nla_len(nla),
934 				       (const char *)nla_data(nla)) == -EAGAIN)
935 			return ERR_PTR(-EAGAIN);
936 	}
937 #endif
938 	return ERR_PTR(-ENOENT);
939 }
940 
nft_base_seq(const struct net * net)941 static __be16 nft_base_seq(const struct net *net)
942 {
943 	struct nftables_pernet *nft_net = nft_pernet(net);
944 
945 	return htons(nft_net->base_seq & 0xffff);
946 }
947 
948 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
949 	[NFTA_TABLE_NAME]	= { .type = NLA_STRING,
950 				    .len = NFT_TABLE_MAXNAMELEN - 1 },
951 	[NFTA_TABLE_FLAGS]	= { .type = NLA_U32 },
952 	[NFTA_TABLE_HANDLE]	= { .type = NLA_U64 },
953 	[NFTA_TABLE_USERDATA]	= { .type = NLA_BINARY,
954 				    .len = NFT_USERDATA_MAXLEN }
955 };
956 
nf_tables_fill_table_info(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,int event,u32 flags,int family,const struct nft_table * table)957 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
958 				     u32 portid, u32 seq, int event, u32 flags,
959 				     int family, const struct nft_table *table)
960 {
961 	struct nlmsghdr *nlh;
962 
963 	event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
964 	nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
965 			   NFNETLINK_V0, nft_base_seq(net));
966 	if (!nlh)
967 		goto nla_put_failure;
968 
969 	if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
970 	    nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
971 	    nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
972 			 NFTA_TABLE_PAD))
973 		goto nla_put_failure;
974 
975 	if (event == NFT_MSG_DELTABLE) {
976 		nlmsg_end(skb, nlh);
977 		return 0;
978 	}
979 
980 	if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
981 			 htonl(table->flags & NFT_TABLE_F_MASK)))
982 		goto nla_put_failure;
983 
984 	if (nft_table_has_owner(table) &&
985 	    nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
986 		goto nla_put_failure;
987 
988 	if (table->udata) {
989 		if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
990 			goto nla_put_failure;
991 	}
992 
993 	nlmsg_end(skb, nlh);
994 	return 0;
995 
996 nla_put_failure:
997 	nlmsg_trim(skb, nlh);
998 	return -1;
999 }
1000 
1001 struct nftnl_skb_parms {
1002 	bool report;
1003 };
1004 #define NFT_CB(skb)	(*(struct nftnl_skb_parms*)&((skb)->cb))
1005 
nft_notify_enqueue(struct sk_buff * skb,bool report,struct list_head * notify_list)1006 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
1007 			       struct list_head *notify_list)
1008 {
1009 	NFT_CB(skb).report = report;
1010 	list_add_tail(&skb->list, notify_list);
1011 }
1012 
nf_tables_table_notify(const struct nft_ctx * ctx,int event)1013 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
1014 {
1015 	struct nftables_pernet *nft_net;
1016 	struct sk_buff *skb;
1017 	u16 flags = 0;
1018 	int err;
1019 
1020 	if (!ctx->report &&
1021 	    !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1022 		return;
1023 
1024 	skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1025 	if (skb == NULL)
1026 		goto err;
1027 
1028 	if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1029 		flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1030 
1031 	err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
1032 					event, flags, ctx->family, ctx->table);
1033 	if (err < 0) {
1034 		kfree_skb(skb);
1035 		goto err;
1036 	}
1037 
1038 	nft_net = nft_pernet(ctx->net);
1039 	nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1040 	return;
1041 err:
1042 	nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1043 }
1044 
nf_tables_dump_tables(struct sk_buff * skb,struct netlink_callback * cb)1045 static int nf_tables_dump_tables(struct sk_buff *skb,
1046 				 struct netlink_callback *cb)
1047 {
1048 	const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1049 	struct nftables_pernet *nft_net;
1050 	const struct nft_table *table;
1051 	unsigned int idx = 0, s_idx = cb->args[0];
1052 	struct net *net = sock_net(skb->sk);
1053 	int family = nfmsg->nfgen_family;
1054 
1055 	rcu_read_lock();
1056 	nft_net = nft_pernet(net);
1057 	cb->seq = READ_ONCE(nft_net->base_seq);
1058 
1059 	list_for_each_entry_rcu(table, &nft_net->tables, list) {
1060 		if (family != NFPROTO_UNSPEC && family != table->family)
1061 			continue;
1062 
1063 		if (idx < s_idx)
1064 			goto cont;
1065 		if (idx > s_idx)
1066 			memset(&cb->args[1], 0,
1067 			       sizeof(cb->args) - sizeof(cb->args[0]));
1068 		if (!nft_is_active(net, table))
1069 			continue;
1070 		if (nf_tables_fill_table_info(skb, net,
1071 					      NETLINK_CB(cb->skb).portid,
1072 					      cb->nlh->nlmsg_seq,
1073 					      NFT_MSG_NEWTABLE, NLM_F_MULTI,
1074 					      table->family, table) < 0)
1075 			goto done;
1076 
1077 		nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1078 cont:
1079 		idx++;
1080 	}
1081 done:
1082 	rcu_read_unlock();
1083 	cb->args[0] = idx;
1084 	return skb->len;
1085 }
1086 
nft_netlink_dump_start_rcu(struct sock * nlsk,struct sk_buff * skb,const struct nlmsghdr * nlh,struct netlink_dump_control * c)1087 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
1088 				      const struct nlmsghdr *nlh,
1089 				      struct netlink_dump_control *c)
1090 {
1091 	int err;
1092 
1093 	if (!try_module_get(THIS_MODULE))
1094 		return -EINVAL;
1095 
1096 	rcu_read_unlock();
1097 	err = netlink_dump_start(nlsk, skb, nlh, c);
1098 	rcu_read_lock();
1099 	module_put(THIS_MODULE);
1100 
1101 	return err;
1102 }
1103 
1104 /* called with rcu_read_lock held */
nf_tables_gettable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])1105 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
1106 			      const struct nlattr * const nla[])
1107 {
1108 	struct netlink_ext_ack *extack = info->extack;
1109 	u8 genmask = nft_genmask_cur(info->net);
1110 	u8 family = info->nfmsg->nfgen_family;
1111 	const struct nft_table *table;
1112 	struct net *net = info->net;
1113 	struct sk_buff *skb2;
1114 	int err;
1115 
1116 	if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1117 		struct netlink_dump_control c = {
1118 			.dump = nf_tables_dump_tables,
1119 			.module = THIS_MODULE,
1120 		};
1121 
1122 		return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1123 	}
1124 
1125 	table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
1126 	if (IS_ERR(table)) {
1127 		NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
1128 		return PTR_ERR(table);
1129 	}
1130 
1131 	skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1132 	if (!skb2)
1133 		return -ENOMEM;
1134 
1135 	err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
1136 					info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
1137 					0, family, table);
1138 	if (err < 0)
1139 		goto err_fill_table_info;
1140 
1141 	return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1142 
1143 err_fill_table_info:
1144 	kfree_skb(skb2);
1145 	return err;
1146 }
1147 
nft_table_disable(struct net * net,struct nft_table * table,u32 cnt)1148 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1149 {
1150 	struct nft_chain *chain;
1151 	u32 i = 0;
1152 
1153 	list_for_each_entry(chain, &table->chains, list) {
1154 		if (!nft_is_active_next(net, chain))
1155 			continue;
1156 		if (!nft_is_base_chain(chain))
1157 			continue;
1158 
1159 		if (cnt && i++ == cnt)
1160 			break;
1161 
1162 		nf_tables_unregister_hook(net, table, chain);
1163 	}
1164 }
1165 
nf_tables_table_enable(struct net * net,struct nft_table * table)1166 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1167 {
1168 	struct nft_chain *chain;
1169 	int err, i = 0;
1170 
1171 	list_for_each_entry(chain, &table->chains, list) {
1172 		if (!nft_is_active_next(net, chain))
1173 			continue;
1174 		if (!nft_is_base_chain(chain))
1175 			continue;
1176 
1177 		err = nf_tables_register_hook(net, table, chain);
1178 		if (err < 0)
1179 			goto err_register_hooks;
1180 
1181 		i++;
1182 	}
1183 	return 0;
1184 
1185 err_register_hooks:
1186 	if (i)
1187 		nft_table_disable(net, table, i);
1188 	return err;
1189 }
1190 
nf_tables_table_disable(struct net * net,struct nft_table * table)1191 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1192 {
1193 	table->flags &= ~NFT_TABLE_F_DORMANT;
1194 	nft_table_disable(net, table, 0);
1195 	table->flags |= NFT_TABLE_F_DORMANT;
1196 }
1197 
1198 #define __NFT_TABLE_F_INTERNAL		(NFT_TABLE_F_MASK + 1)
1199 #define __NFT_TABLE_F_WAS_DORMANT	(__NFT_TABLE_F_INTERNAL << 0)
1200 #define __NFT_TABLE_F_WAS_AWAKEN	(__NFT_TABLE_F_INTERNAL << 1)
1201 #define __NFT_TABLE_F_UPDATE		(__NFT_TABLE_F_WAS_DORMANT | \
1202 					 __NFT_TABLE_F_WAS_AWAKEN)
1203 
nft_table_pending_update(const struct nft_ctx * ctx)1204 static bool nft_table_pending_update(const struct nft_ctx *ctx)
1205 {
1206 	struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1207 	struct nft_trans *trans;
1208 
1209 	if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
1210 		return true;
1211 
1212 	list_for_each_entry(trans, &nft_net->commit_list, list) {
1213 		if (trans->ctx.table == ctx->table &&
1214 		    ((trans->msg_type == NFT_MSG_NEWCHAIN &&
1215 		      nft_trans_chain_update(trans)) ||
1216 		     (trans->msg_type == NFT_MSG_DELCHAIN &&
1217 		      nft_is_base_chain(trans->ctx.chain))))
1218 			return true;
1219 	}
1220 
1221 	return false;
1222 }
1223 
nf_tables_updtable(struct nft_ctx * ctx)1224 static int nf_tables_updtable(struct nft_ctx *ctx)
1225 {
1226 	struct nft_trans *trans;
1227 	u32 flags;
1228 	int ret;
1229 
1230 	if (!ctx->nla[NFTA_TABLE_FLAGS])
1231 		return 0;
1232 
1233 	flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1234 	if (flags & ~NFT_TABLE_F_MASK)
1235 		return -EOPNOTSUPP;
1236 
1237 	if (flags == (ctx->table->flags & NFT_TABLE_F_MASK))
1238 		return 0;
1239 
1240 	if ((nft_table_has_owner(ctx->table) &&
1241 	     !(flags & NFT_TABLE_F_OWNER)) ||
1242 	    (!nft_table_has_owner(ctx->table) &&
1243 	     flags & NFT_TABLE_F_OWNER))
1244 		return -EOPNOTSUPP;
1245 
1246 	/* No dormant off/on/off/on games in single transaction */
1247 	if (nft_table_pending_update(ctx))
1248 		return -EINVAL;
1249 
1250 	trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1251 				sizeof(struct nft_trans_table));
1252 	if (trans == NULL)
1253 		return -ENOMEM;
1254 
1255 	if ((flags & NFT_TABLE_F_DORMANT) &&
1256 	    !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1257 		ctx->table->flags |= NFT_TABLE_F_DORMANT;
1258 		if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1259 			ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1260 	} else if (!(flags & NFT_TABLE_F_DORMANT) &&
1261 		   ctx->table->flags & NFT_TABLE_F_DORMANT) {
1262 		ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1263 		if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1264 			ret = nf_tables_table_enable(ctx->net, ctx->table);
1265 			if (ret < 0)
1266 				goto err_register_hooks;
1267 
1268 			ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1269 		}
1270 	}
1271 
1272 	nft_trans_table_update(trans) = true;
1273 	nft_trans_commit_list_add_tail(ctx->net, trans);
1274 
1275 	return 0;
1276 
1277 err_register_hooks:
1278 	ctx->table->flags |= NFT_TABLE_F_DORMANT;
1279 	nft_trans_destroy(trans);
1280 	return ret;
1281 }
1282 
nft_chain_hash(const void * data,u32 len,u32 seed)1283 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1284 {
1285 	const char *name = data;
1286 
1287 	return jhash(name, strlen(name), seed);
1288 }
1289 
nft_chain_hash_obj(const void * data,u32 len,u32 seed)1290 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1291 {
1292 	const struct nft_chain *chain = data;
1293 
1294 	return nft_chain_hash(chain->name, 0, seed);
1295 }
1296 
nft_chain_hash_cmp(struct rhashtable_compare_arg * arg,const void * ptr)1297 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1298 			      const void *ptr)
1299 {
1300 	const struct nft_chain *chain = ptr;
1301 	const char *name = arg->key;
1302 
1303 	return strcmp(chain->name, name);
1304 }
1305 
nft_objname_hash(const void * data,u32 len,u32 seed)1306 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1307 {
1308 	const struct nft_object_hash_key *k = data;
1309 
1310 	seed ^= hash_ptr(k->table, 32);
1311 
1312 	return jhash(k->name, strlen(k->name), seed);
1313 }
1314 
nft_objname_hash_obj(const void * data,u32 len,u32 seed)1315 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1316 {
1317 	const struct nft_object *obj = data;
1318 
1319 	return nft_objname_hash(&obj->key, 0, seed);
1320 }
1321 
nft_objname_hash_cmp(struct rhashtable_compare_arg * arg,const void * ptr)1322 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1323 				const void *ptr)
1324 {
1325 	const struct nft_object_hash_key *k = arg->key;
1326 	const struct nft_object *obj = ptr;
1327 
1328 	if (obj->key.table != k->table)
1329 		return -1;
1330 
1331 	return strcmp(obj->key.name, k->name);
1332 }
1333 
nft_supported_family(u8 family)1334 static bool nft_supported_family(u8 family)
1335 {
1336 	return false
1337 #ifdef CONFIG_NF_TABLES_INET
1338 		|| family == NFPROTO_INET
1339 #endif
1340 #ifdef CONFIG_NF_TABLES_IPV4
1341 		|| family == NFPROTO_IPV4
1342 #endif
1343 #ifdef CONFIG_NF_TABLES_ARP
1344 		|| family == NFPROTO_ARP
1345 #endif
1346 #ifdef CONFIG_NF_TABLES_NETDEV
1347 		|| family == NFPROTO_NETDEV
1348 #endif
1349 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1350 		|| family == NFPROTO_BRIDGE
1351 #endif
1352 #ifdef CONFIG_NF_TABLES_IPV6
1353 		|| family == NFPROTO_IPV6
1354 #endif
1355 		;
1356 }
1357 
nf_tables_newtable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])1358 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1359 			      const struct nlattr * const nla[])
1360 {
1361 	struct nftables_pernet *nft_net = nft_pernet(info->net);
1362 	struct netlink_ext_ack *extack = info->extack;
1363 	u8 genmask = nft_genmask_next(info->net);
1364 	u8 family = info->nfmsg->nfgen_family;
1365 	struct net *net = info->net;
1366 	const struct nlattr *attr;
1367 	struct nft_table *table;
1368 	struct nft_ctx ctx;
1369 	u32 flags = 0;
1370 	int err;
1371 
1372 	if (!nft_supported_family(family))
1373 		return -EOPNOTSUPP;
1374 
1375 	lockdep_assert_held(&nft_net->commit_mutex);
1376 	attr = nla[NFTA_TABLE_NAME];
1377 	table = nft_table_lookup(net, attr, family, genmask,
1378 				 NETLINK_CB(skb).portid);
1379 	if (IS_ERR(table)) {
1380 		if (PTR_ERR(table) != -ENOENT)
1381 			return PTR_ERR(table);
1382 	} else {
1383 		if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1384 			NL_SET_BAD_ATTR(extack, attr);
1385 			return -EEXIST;
1386 		}
1387 		if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1388 			return -EOPNOTSUPP;
1389 
1390 		nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1391 
1392 		return nf_tables_updtable(&ctx);
1393 	}
1394 
1395 	if (nla[NFTA_TABLE_FLAGS]) {
1396 		flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1397 		if (flags & ~NFT_TABLE_F_MASK)
1398 			return -EOPNOTSUPP;
1399 	}
1400 
1401 	err = -ENOMEM;
1402 	table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1403 	if (table == NULL)
1404 		goto err_kzalloc;
1405 
1406 	table->validate_state = nft_net->validate_state;
1407 	table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1408 	if (table->name == NULL)
1409 		goto err_strdup;
1410 
1411 	if (nla[NFTA_TABLE_USERDATA]) {
1412 		table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1413 		if (table->udata == NULL)
1414 			goto err_table_udata;
1415 
1416 		table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1417 	}
1418 
1419 	err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1420 	if (err)
1421 		goto err_chain_ht;
1422 
1423 	INIT_LIST_HEAD(&table->chains);
1424 	INIT_LIST_HEAD(&table->sets);
1425 	INIT_LIST_HEAD(&table->objects);
1426 	INIT_LIST_HEAD(&table->flowtables);
1427 	table->family = family;
1428 	table->flags = flags;
1429 	table->handle = ++nft_net->table_handle;
1430 	if (table->flags & NFT_TABLE_F_OWNER)
1431 		table->nlpid = NETLINK_CB(skb).portid;
1432 
1433 	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1434 	err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1435 	if (err < 0)
1436 		goto err_trans;
1437 
1438 	list_add_tail_rcu(&table->list, &nft_net->tables);
1439 	return 0;
1440 err_trans:
1441 	rhltable_destroy(&table->chains_ht);
1442 err_chain_ht:
1443 	kfree(table->udata);
1444 err_table_udata:
1445 	kfree(table->name);
1446 err_strdup:
1447 	kfree(table);
1448 err_kzalloc:
1449 	return err;
1450 }
1451 
nft_flush_table(struct nft_ctx * ctx)1452 static int nft_flush_table(struct nft_ctx *ctx)
1453 {
1454 	struct nft_flowtable *flowtable, *nft;
1455 	struct nft_chain *chain, *nc;
1456 	struct nft_object *obj, *ne;
1457 	struct nft_set *set, *ns;
1458 	int err;
1459 
1460 	list_for_each_entry(chain, &ctx->table->chains, list) {
1461 		if (!nft_is_active_next(ctx->net, chain))
1462 			continue;
1463 
1464 		if (nft_chain_binding(chain))
1465 			continue;
1466 
1467 		ctx->chain = chain;
1468 
1469 		err = nft_delrule_by_chain(ctx);
1470 		if (err < 0)
1471 			goto out;
1472 	}
1473 
1474 	list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1475 		if (!nft_is_active_next(ctx->net, set))
1476 			continue;
1477 
1478 		if (nft_set_is_anonymous(set))
1479 			continue;
1480 
1481 		err = nft_delset(ctx, set);
1482 		if (err < 0)
1483 			goto out;
1484 	}
1485 
1486 	list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1487 		if (!nft_is_active_next(ctx->net, flowtable))
1488 			continue;
1489 
1490 		err = nft_delflowtable(ctx, flowtable);
1491 		if (err < 0)
1492 			goto out;
1493 	}
1494 
1495 	list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1496 		if (!nft_is_active_next(ctx->net, obj))
1497 			continue;
1498 
1499 		err = nft_delobj(ctx, obj);
1500 		if (err < 0)
1501 			goto out;
1502 	}
1503 
1504 	list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1505 		if (!nft_is_active_next(ctx->net, chain))
1506 			continue;
1507 
1508 		if (nft_chain_binding(chain))
1509 			continue;
1510 
1511 		ctx->chain = chain;
1512 
1513 		err = nft_delchain(ctx);
1514 		if (err < 0)
1515 			goto out;
1516 	}
1517 
1518 	err = nft_deltable(ctx);
1519 out:
1520 	return err;
1521 }
1522 
nft_flush(struct nft_ctx * ctx,int family)1523 static int nft_flush(struct nft_ctx *ctx, int family)
1524 {
1525 	struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1526 	const struct nlattr * const *nla = ctx->nla;
1527 	struct nft_table *table, *nt;
1528 	int err = 0;
1529 
1530 	list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1531 		if (family != AF_UNSPEC && table->family != family)
1532 			continue;
1533 
1534 		ctx->family = table->family;
1535 
1536 		if (!nft_is_active_next(ctx->net, table))
1537 			continue;
1538 
1539 		if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1540 			continue;
1541 
1542 		if (nla[NFTA_TABLE_NAME] &&
1543 		    nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1544 			continue;
1545 
1546 		ctx->table = table;
1547 
1548 		err = nft_flush_table(ctx);
1549 		if (err < 0)
1550 			goto out;
1551 	}
1552 out:
1553 	return err;
1554 }
1555 
nf_tables_deltable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])1556 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1557 			      const struct nlattr * const nla[])
1558 {
1559 	struct netlink_ext_ack *extack = info->extack;
1560 	u8 genmask = nft_genmask_next(info->net);
1561 	u8 family = info->nfmsg->nfgen_family;
1562 	struct net *net = info->net;
1563 	const struct nlattr *attr;
1564 	struct nft_table *table;
1565 	struct nft_ctx ctx;
1566 
1567 	nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1568 	if (family == AF_UNSPEC ||
1569 	    (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1570 		return nft_flush(&ctx, family);
1571 
1572 	if (nla[NFTA_TABLE_HANDLE]) {
1573 		attr = nla[NFTA_TABLE_HANDLE];
1574 		table = nft_table_lookup_byhandle(net, attr, family, genmask,
1575 						  NETLINK_CB(skb).portid);
1576 	} else {
1577 		attr = nla[NFTA_TABLE_NAME];
1578 		table = nft_table_lookup(net, attr, family, genmask,
1579 					 NETLINK_CB(skb).portid);
1580 	}
1581 
1582 	if (IS_ERR(table)) {
1583 		if (PTR_ERR(table) == -ENOENT &&
1584 		    NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1585 			return 0;
1586 
1587 		NL_SET_BAD_ATTR(extack, attr);
1588 		return PTR_ERR(table);
1589 	}
1590 
1591 	if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1592 	    table->use > 0)
1593 		return -EBUSY;
1594 
1595 	ctx.family = family;
1596 	ctx.table = table;
1597 
1598 	return nft_flush_table(&ctx);
1599 }
1600 
nf_tables_table_destroy(struct nft_ctx * ctx)1601 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1602 {
1603 	if (WARN_ON(ctx->table->use > 0))
1604 		return;
1605 
1606 	rhltable_destroy(&ctx->table->chains_ht);
1607 	kfree(ctx->table->name);
1608 	kfree(ctx->table->udata);
1609 	kfree(ctx->table);
1610 }
1611 
nft_register_chain_type(const struct nft_chain_type * ctype)1612 void nft_register_chain_type(const struct nft_chain_type *ctype)
1613 {
1614 	nfnl_lock(NFNL_SUBSYS_NFTABLES);
1615 	if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1616 		nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1617 		return;
1618 	}
1619 	chain_type[ctype->family][ctype->type] = ctype;
1620 	nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1621 }
1622 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1623 
nft_unregister_chain_type(const struct nft_chain_type * ctype)1624 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1625 {
1626 	nfnl_lock(NFNL_SUBSYS_NFTABLES);
1627 	chain_type[ctype->family][ctype->type] = NULL;
1628 	nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1629 }
1630 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1631 
1632 /*
1633  * Chains
1634  */
1635 
1636 static struct nft_chain *
nft_chain_lookup_byhandle(const struct nft_table * table,u64 handle,u8 genmask)1637 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1638 {
1639 	struct nft_chain *chain;
1640 
1641 	list_for_each_entry(chain, &table->chains, list) {
1642 		if (chain->handle == handle &&
1643 		    nft_active_genmask(chain, genmask))
1644 			return chain;
1645 	}
1646 
1647 	return ERR_PTR(-ENOENT);
1648 }
1649 
lockdep_commit_lock_is_held(const struct net * net)1650 static bool lockdep_commit_lock_is_held(const struct net *net)
1651 {
1652 #ifdef CONFIG_PROVE_LOCKING
1653 	struct nftables_pernet *nft_net = nft_pernet(net);
1654 
1655 	return lockdep_is_held(&nft_net->commit_mutex);
1656 #else
1657 	return true;
1658 #endif
1659 }
1660 
nft_chain_lookup(struct net * net,struct nft_table * table,const struct nlattr * nla,u8 genmask)1661 static struct nft_chain *nft_chain_lookup(struct net *net,
1662 					  struct nft_table *table,
1663 					  const struct nlattr *nla, u8 genmask)
1664 {
1665 	char search[NFT_CHAIN_MAXNAMELEN + 1];
1666 	struct rhlist_head *tmp, *list;
1667 	struct nft_chain *chain;
1668 
1669 	if (nla == NULL)
1670 		return ERR_PTR(-EINVAL);
1671 
1672 	nla_strscpy(search, nla, sizeof(search));
1673 
1674 	WARN_ON(!rcu_read_lock_held() &&
1675 		!lockdep_commit_lock_is_held(net));
1676 
1677 	chain = ERR_PTR(-ENOENT);
1678 	rcu_read_lock();
1679 	list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1680 	if (!list)
1681 		goto out_unlock;
1682 
1683 	rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1684 		if (nft_active_genmask(chain, genmask))
1685 			goto out_unlock;
1686 	}
1687 	chain = ERR_PTR(-ENOENT);
1688 out_unlock:
1689 	rcu_read_unlock();
1690 	return chain;
1691 }
1692 
1693 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1694 	[NFTA_CHAIN_TABLE]	= { .type = NLA_STRING,
1695 				    .len = NFT_TABLE_MAXNAMELEN - 1 },
1696 	[NFTA_CHAIN_HANDLE]	= { .type = NLA_U64 },
1697 	[NFTA_CHAIN_NAME]	= { .type = NLA_STRING,
1698 				    .len = NFT_CHAIN_MAXNAMELEN - 1 },
1699 	[NFTA_CHAIN_HOOK]	= { .type = NLA_NESTED },
1700 	[NFTA_CHAIN_POLICY]	= { .type = NLA_U32 },
1701 	[NFTA_CHAIN_TYPE]	= { .type = NLA_STRING,
1702 				    .len = NFT_MODULE_AUTOLOAD_LIMIT },
1703 	[NFTA_CHAIN_COUNTERS]	= { .type = NLA_NESTED },
1704 	[NFTA_CHAIN_FLAGS]	= { .type = NLA_U32 },
1705 	[NFTA_CHAIN_ID]		= { .type = NLA_U32 },
1706 	[NFTA_CHAIN_USERDATA]	= { .type = NLA_BINARY,
1707 				    .len = NFT_USERDATA_MAXLEN },
1708 };
1709 
1710 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1711 	[NFTA_HOOK_HOOKNUM]	= { .type = NLA_U32 },
1712 	[NFTA_HOOK_PRIORITY]	= { .type = NLA_U32 },
1713 	[NFTA_HOOK_DEV]		= { .type = NLA_STRING,
1714 				    .len = IFNAMSIZ - 1 },
1715 };
1716 
nft_dump_stats(struct sk_buff * skb,struct nft_stats __percpu * stats)1717 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1718 {
1719 	struct nft_stats *cpu_stats, total;
1720 	struct nlattr *nest;
1721 	unsigned int seq;
1722 	u64 pkts, bytes;
1723 	int cpu;
1724 
1725 	if (!stats)
1726 		return 0;
1727 
1728 	memset(&total, 0, sizeof(total));
1729 	for_each_possible_cpu(cpu) {
1730 		cpu_stats = per_cpu_ptr(stats, cpu);
1731 		do {
1732 			seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1733 			pkts = cpu_stats->pkts;
1734 			bytes = cpu_stats->bytes;
1735 		} while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1736 		total.pkts += pkts;
1737 		total.bytes += bytes;
1738 	}
1739 	nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1740 	if (nest == NULL)
1741 		goto nla_put_failure;
1742 
1743 	if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1744 			 NFTA_COUNTER_PAD) ||
1745 	    nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1746 			 NFTA_COUNTER_PAD))
1747 		goto nla_put_failure;
1748 
1749 	nla_nest_end(skb, nest);
1750 	return 0;
1751 
1752 nla_put_failure:
1753 	return -ENOSPC;
1754 }
1755 
nft_dump_basechain_hook(struct sk_buff * skb,int family,const struct nft_base_chain * basechain,const struct list_head * hook_list)1756 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1757 				   const struct nft_base_chain *basechain,
1758 				   const struct list_head *hook_list)
1759 {
1760 	const struct nf_hook_ops *ops = &basechain->ops;
1761 	struct nft_hook *hook, *first = NULL;
1762 	struct nlattr *nest, *nest_devs;
1763 	int n = 0;
1764 
1765 	nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1766 	if (nest == NULL)
1767 		goto nla_put_failure;
1768 	if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1769 		goto nla_put_failure;
1770 	if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1771 		goto nla_put_failure;
1772 
1773 	if (nft_base_chain_netdev(family, ops->hooknum)) {
1774 		nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1775 		if (!nest_devs)
1776 			goto nla_put_failure;
1777 
1778 		if (!hook_list)
1779 			hook_list = &basechain->hook_list;
1780 
1781 		list_for_each_entry(hook, hook_list, list) {
1782 			if (!first)
1783 				first = hook;
1784 
1785 			if (nla_put_string(skb, NFTA_DEVICE_NAME,
1786 					   hook->ops.dev->name))
1787 				goto nla_put_failure;
1788 			n++;
1789 		}
1790 		nla_nest_end(skb, nest_devs);
1791 
1792 		if (n == 1 &&
1793 		    nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1794 			goto nla_put_failure;
1795 	}
1796 	nla_nest_end(skb, nest);
1797 
1798 	return 0;
1799 nla_put_failure:
1800 	return -1;
1801 }
1802 
nf_tables_fill_chain_info(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,int event,u32 flags,int family,const struct nft_table * table,const struct nft_chain * chain,const struct list_head * hook_list)1803 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1804 				     u32 portid, u32 seq, int event, u32 flags,
1805 				     int family, const struct nft_table *table,
1806 				     const struct nft_chain *chain,
1807 				     const struct list_head *hook_list)
1808 {
1809 	struct nlmsghdr *nlh;
1810 
1811 	event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1812 	nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1813 			   NFNETLINK_V0, nft_base_seq(net));
1814 	if (!nlh)
1815 		goto nla_put_failure;
1816 
1817 	if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1818 	    nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1819 	    nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1820 			 NFTA_CHAIN_PAD))
1821 		goto nla_put_failure;
1822 
1823 	if (event == NFT_MSG_DELCHAIN && !hook_list) {
1824 		nlmsg_end(skb, nlh);
1825 		return 0;
1826 	}
1827 
1828 	if (nft_is_base_chain(chain)) {
1829 		const struct nft_base_chain *basechain = nft_base_chain(chain);
1830 		struct nft_stats __percpu *stats;
1831 
1832 		if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1833 			goto nla_put_failure;
1834 
1835 		if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1836 				 htonl(basechain->policy)))
1837 			goto nla_put_failure;
1838 
1839 		if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1840 			goto nla_put_failure;
1841 
1842 		stats = rcu_dereference_check(basechain->stats,
1843 					      lockdep_commit_lock_is_held(net));
1844 		if (nft_dump_stats(skb, stats))
1845 			goto nla_put_failure;
1846 	}
1847 
1848 	if (chain->flags &&
1849 	    nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1850 		goto nla_put_failure;
1851 
1852 	if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1853 		goto nla_put_failure;
1854 
1855 	if (chain->udata &&
1856 	    nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1857 		goto nla_put_failure;
1858 
1859 	nlmsg_end(skb, nlh);
1860 	return 0;
1861 
1862 nla_put_failure:
1863 	nlmsg_trim(skb, nlh);
1864 	return -1;
1865 }
1866 
nf_tables_chain_notify(const struct nft_ctx * ctx,int event,const struct list_head * hook_list)1867 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1868 				   const struct list_head *hook_list)
1869 {
1870 	struct nftables_pernet *nft_net;
1871 	struct sk_buff *skb;
1872 	u16 flags = 0;
1873 	int err;
1874 
1875 	if (!ctx->report &&
1876 	    !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1877 		return;
1878 
1879 	skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1880 	if (skb == NULL)
1881 		goto err;
1882 
1883 	if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1884 		flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1885 
1886 	err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1887 					event, flags, ctx->family, ctx->table,
1888 					ctx->chain, hook_list);
1889 	if (err < 0) {
1890 		kfree_skb(skb);
1891 		goto err;
1892 	}
1893 
1894 	nft_net = nft_pernet(ctx->net);
1895 	nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1896 	return;
1897 err:
1898 	nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1899 }
1900 
nf_tables_dump_chains(struct sk_buff * skb,struct netlink_callback * cb)1901 static int nf_tables_dump_chains(struct sk_buff *skb,
1902 				 struct netlink_callback *cb)
1903 {
1904 	const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1905 	unsigned int idx = 0, s_idx = cb->args[0];
1906 	struct net *net = sock_net(skb->sk);
1907 	int family = nfmsg->nfgen_family;
1908 	struct nftables_pernet *nft_net;
1909 	const struct nft_table *table;
1910 	const struct nft_chain *chain;
1911 
1912 	rcu_read_lock();
1913 	nft_net = nft_pernet(net);
1914 	cb->seq = READ_ONCE(nft_net->base_seq);
1915 
1916 	list_for_each_entry_rcu(table, &nft_net->tables, list) {
1917 		if (family != NFPROTO_UNSPEC && family != table->family)
1918 			continue;
1919 
1920 		list_for_each_entry_rcu(chain, &table->chains, list) {
1921 			if (idx < s_idx)
1922 				goto cont;
1923 			if (idx > s_idx)
1924 				memset(&cb->args[1], 0,
1925 				       sizeof(cb->args) - sizeof(cb->args[0]));
1926 			if (!nft_is_active(net, chain))
1927 				continue;
1928 			if (nf_tables_fill_chain_info(skb, net,
1929 						      NETLINK_CB(cb->skb).portid,
1930 						      cb->nlh->nlmsg_seq,
1931 						      NFT_MSG_NEWCHAIN,
1932 						      NLM_F_MULTI,
1933 						      table->family, table,
1934 						      chain, NULL) < 0)
1935 				goto done;
1936 
1937 			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1938 cont:
1939 			idx++;
1940 		}
1941 	}
1942 done:
1943 	rcu_read_unlock();
1944 	cb->args[0] = idx;
1945 	return skb->len;
1946 }
1947 
1948 /* called with rcu_read_lock held */
nf_tables_getchain(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])1949 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1950 			      const struct nlattr * const nla[])
1951 {
1952 	struct netlink_ext_ack *extack = info->extack;
1953 	u8 genmask = nft_genmask_cur(info->net);
1954 	u8 family = info->nfmsg->nfgen_family;
1955 	const struct nft_chain *chain;
1956 	struct net *net = info->net;
1957 	struct nft_table *table;
1958 	struct sk_buff *skb2;
1959 	int err;
1960 
1961 	if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1962 		struct netlink_dump_control c = {
1963 			.dump = nf_tables_dump_chains,
1964 			.module = THIS_MODULE,
1965 		};
1966 
1967 		return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1968 	}
1969 
1970 	table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1971 	if (IS_ERR(table)) {
1972 		NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1973 		return PTR_ERR(table);
1974 	}
1975 
1976 	chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1977 	if (IS_ERR(chain)) {
1978 		NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1979 		return PTR_ERR(chain);
1980 	}
1981 
1982 	skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1983 	if (!skb2)
1984 		return -ENOMEM;
1985 
1986 	err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1987 					info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1988 					0, family, table, chain, NULL);
1989 	if (err < 0)
1990 		goto err_fill_chain_info;
1991 
1992 	return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1993 
1994 err_fill_chain_info:
1995 	kfree_skb(skb2);
1996 	return err;
1997 }
1998 
1999 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
2000 	[NFTA_COUNTER_PACKETS]	= { .type = NLA_U64 },
2001 	[NFTA_COUNTER_BYTES]	= { .type = NLA_U64 },
2002 };
2003 
nft_stats_alloc(const struct nlattr * attr)2004 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
2005 {
2006 	struct nlattr *tb[NFTA_COUNTER_MAX+1];
2007 	struct nft_stats __percpu *newstats;
2008 	struct nft_stats *stats;
2009 	int err;
2010 
2011 	err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
2012 					  nft_counter_policy, NULL);
2013 	if (err < 0)
2014 		return ERR_PTR(err);
2015 
2016 	if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
2017 		return ERR_PTR(-EINVAL);
2018 
2019 	newstats = netdev_alloc_pcpu_stats(struct nft_stats);
2020 	if (newstats == NULL)
2021 		return ERR_PTR(-ENOMEM);
2022 
2023 	/* Restore old counters on this cpu, no problem. Per-cpu statistics
2024 	 * are not exposed to userspace.
2025 	 */
2026 	preempt_disable();
2027 	stats = this_cpu_ptr(newstats);
2028 	stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
2029 	stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
2030 	preempt_enable();
2031 
2032 	return newstats;
2033 }
2034 
nft_chain_stats_replace(struct nft_trans * trans)2035 static void nft_chain_stats_replace(struct nft_trans *trans)
2036 {
2037 	struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
2038 
2039 	if (!nft_trans_chain_stats(trans))
2040 		return;
2041 
2042 	nft_trans_chain_stats(trans) =
2043 		rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
2044 				    lockdep_commit_lock_is_held(trans->ctx.net));
2045 
2046 	if (!nft_trans_chain_stats(trans))
2047 		static_branch_inc(&nft_counters_enabled);
2048 }
2049 
nf_tables_chain_free_chain_rules(struct nft_chain * chain)2050 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
2051 {
2052 	struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
2053 	struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
2054 
2055 	if (g0 != g1)
2056 		kvfree(g1);
2057 	kvfree(g0);
2058 
2059 	/* should be NULL either via abort or via successful commit */
2060 	WARN_ON_ONCE(chain->blob_next);
2061 	kvfree(chain->blob_next);
2062 }
2063 
nf_tables_chain_destroy(struct nft_ctx * ctx)2064 void nf_tables_chain_destroy(struct nft_ctx *ctx)
2065 {
2066 	struct nft_chain *chain = ctx->chain;
2067 	struct nft_hook *hook, *next;
2068 
2069 	if (WARN_ON(chain->use > 0))
2070 		return;
2071 
2072 	/* no concurrent access possible anymore */
2073 	nf_tables_chain_free_chain_rules(chain);
2074 
2075 	if (nft_is_base_chain(chain)) {
2076 		struct nft_base_chain *basechain = nft_base_chain(chain);
2077 
2078 		if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2079 			list_for_each_entry_safe(hook, next,
2080 						 &basechain->hook_list, list) {
2081 				list_del_rcu(&hook->list);
2082 				kfree_rcu(hook, rcu);
2083 			}
2084 		}
2085 		module_put(basechain->type->owner);
2086 		if (rcu_access_pointer(basechain->stats)) {
2087 			static_branch_dec(&nft_counters_enabled);
2088 			free_percpu(rcu_dereference_raw(basechain->stats));
2089 		}
2090 		kfree(chain->name);
2091 		kfree(chain->udata);
2092 		kfree(basechain);
2093 	} else {
2094 		kfree(chain->name);
2095 		kfree(chain->udata);
2096 		kfree(chain);
2097 	}
2098 }
2099 
nft_netdev_hook_alloc(struct net * net,const struct nlattr * attr)2100 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2101 					      const struct nlattr *attr)
2102 {
2103 	struct net_device *dev;
2104 	char ifname[IFNAMSIZ];
2105 	struct nft_hook *hook;
2106 	int err;
2107 
2108 	hook = kzalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2109 	if (!hook) {
2110 		err = -ENOMEM;
2111 		goto err_hook_alloc;
2112 	}
2113 
2114 	nla_strscpy(ifname, attr, IFNAMSIZ);
2115 	/* nf_tables_netdev_event() is called under rtnl_mutex, this is
2116 	 * indirectly serializing all the other holders of the commit_mutex with
2117 	 * the rtnl_mutex.
2118 	 */
2119 	dev = __dev_get_by_name(net, ifname);
2120 	if (!dev) {
2121 		err = -ENOENT;
2122 		goto err_hook_dev;
2123 	}
2124 	hook->ops.dev = dev;
2125 
2126 	return hook;
2127 
2128 err_hook_dev:
2129 	kfree(hook);
2130 err_hook_alloc:
2131 	return ERR_PTR(err);
2132 }
2133 
nft_hook_list_find(struct list_head * hook_list,const struct nft_hook * this)2134 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2135 					   const struct nft_hook *this)
2136 {
2137 	struct nft_hook *hook;
2138 
2139 	list_for_each_entry(hook, hook_list, list) {
2140 		if (this->ops.dev == hook->ops.dev)
2141 			return hook;
2142 	}
2143 
2144 	return NULL;
2145 }
2146 
nf_tables_parse_netdev_hooks(struct net * net,const struct nlattr * attr,struct list_head * hook_list,struct netlink_ext_ack * extack)2147 static int nf_tables_parse_netdev_hooks(struct net *net,
2148 					const struct nlattr *attr,
2149 					struct list_head *hook_list,
2150 					struct netlink_ext_ack *extack)
2151 {
2152 	struct nft_hook *hook, *next;
2153 	const struct nlattr *tmp;
2154 	int rem, n = 0, err;
2155 
2156 	nla_for_each_nested(tmp, attr, rem) {
2157 		if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2158 			err = -EINVAL;
2159 			goto err_hook;
2160 		}
2161 
2162 		hook = nft_netdev_hook_alloc(net, tmp);
2163 		if (IS_ERR(hook)) {
2164 			NL_SET_BAD_ATTR(extack, tmp);
2165 			err = PTR_ERR(hook);
2166 			goto err_hook;
2167 		}
2168 		if (nft_hook_list_find(hook_list, hook)) {
2169 			NL_SET_BAD_ATTR(extack, tmp);
2170 			kfree(hook);
2171 			err = -EEXIST;
2172 			goto err_hook;
2173 		}
2174 		list_add_tail(&hook->list, hook_list);
2175 		n++;
2176 
2177 		if (n == NFT_NETDEVICE_MAX) {
2178 			err = -EFBIG;
2179 			goto err_hook;
2180 		}
2181 	}
2182 
2183 	return 0;
2184 
2185 err_hook:
2186 	list_for_each_entry_safe(hook, next, hook_list, list) {
2187 		list_del(&hook->list);
2188 		kfree(hook);
2189 	}
2190 	return err;
2191 }
2192 
2193 struct nft_chain_hook {
2194 	u32				num;
2195 	s32				priority;
2196 	const struct nft_chain_type	*type;
2197 	struct list_head		list;
2198 };
2199 
nft_chain_parse_netdev(struct net * net,struct nlattr * tb[],struct list_head * hook_list,struct netlink_ext_ack * extack,u32 flags)2200 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2201 				  struct list_head *hook_list,
2202 				  struct netlink_ext_ack *extack, u32 flags)
2203 {
2204 	struct nft_hook *hook;
2205 	int err;
2206 
2207 	if (tb[NFTA_HOOK_DEV]) {
2208 		hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2209 		if (IS_ERR(hook)) {
2210 			NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2211 			return PTR_ERR(hook);
2212 		}
2213 
2214 		list_add_tail(&hook->list, hook_list);
2215 	} else if (tb[NFTA_HOOK_DEVS]) {
2216 		err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2217 						   hook_list, extack);
2218 		if (err < 0)
2219 			return err;
2220 
2221 	}
2222 
2223 	if (flags & NFT_CHAIN_HW_OFFLOAD &&
2224 	    list_empty(hook_list))
2225 		return -EINVAL;
2226 
2227 	return 0;
2228 }
2229 
nft_chain_parse_hook(struct net * net,struct nft_base_chain * basechain,const struct nlattr * const nla[],struct nft_chain_hook * hook,u8 family,u32 flags,struct netlink_ext_ack * extack)2230 static int nft_chain_parse_hook(struct net *net,
2231 				struct nft_base_chain *basechain,
2232 				const struct nlattr * const nla[],
2233 				struct nft_chain_hook *hook, u8 family,
2234 				u32 flags, struct netlink_ext_ack *extack)
2235 {
2236 	struct nftables_pernet *nft_net = nft_pernet(net);
2237 	struct nlattr *ha[NFTA_HOOK_MAX + 1];
2238 	const struct nft_chain_type *type;
2239 	int err;
2240 
2241 	lockdep_assert_held(&nft_net->commit_mutex);
2242 	lockdep_nfnl_nft_mutex_not_held();
2243 
2244 	err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2245 					  nla[NFTA_CHAIN_HOOK],
2246 					  nft_hook_policy, NULL);
2247 	if (err < 0)
2248 		return err;
2249 
2250 	if (!basechain) {
2251 		if (!ha[NFTA_HOOK_HOOKNUM] ||
2252 		    !ha[NFTA_HOOK_PRIORITY]) {
2253 			NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2254 			return -ENOENT;
2255 		}
2256 
2257 		hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2258 		hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2259 
2260 		type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2261 		if (!type)
2262 			return -EOPNOTSUPP;
2263 
2264 		if (nla[NFTA_CHAIN_TYPE]) {
2265 			type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2266 							   family, true);
2267 			if (IS_ERR(type)) {
2268 				NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2269 				return PTR_ERR(type);
2270 			}
2271 		}
2272 		if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2273 			return -EOPNOTSUPP;
2274 
2275 		if (type->type == NFT_CHAIN_T_NAT &&
2276 		    hook->priority <= NF_IP_PRI_CONNTRACK)
2277 			return -EOPNOTSUPP;
2278 	} else {
2279 		if (ha[NFTA_HOOK_HOOKNUM]) {
2280 			hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2281 			if (hook->num != basechain->ops.hooknum)
2282 				return -EOPNOTSUPP;
2283 		}
2284 		if (ha[NFTA_HOOK_PRIORITY]) {
2285 			hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2286 			if (hook->priority != basechain->ops.priority)
2287 				return -EOPNOTSUPP;
2288 		}
2289 
2290 		if (nla[NFTA_CHAIN_TYPE]) {
2291 			type = __nf_tables_chain_type_lookup(nla[NFTA_CHAIN_TYPE],
2292 							     family);
2293 			if (!type) {
2294 				NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2295 				return -ENOENT;
2296 			}
2297 		} else {
2298 			type = basechain->type;
2299 		}
2300 	}
2301 
2302 	if (!try_module_get(type->owner)) {
2303 		if (nla[NFTA_CHAIN_TYPE])
2304 			NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2305 		return -ENOENT;
2306 	}
2307 
2308 	hook->type = type;
2309 
2310 	INIT_LIST_HEAD(&hook->list);
2311 	if (nft_base_chain_netdev(family, hook->num)) {
2312 		err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2313 		if (err < 0) {
2314 			module_put(type->owner);
2315 			return err;
2316 		}
2317 	} else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2318 		module_put(type->owner);
2319 		return -EOPNOTSUPP;
2320 	}
2321 
2322 	return 0;
2323 }
2324 
nft_chain_release_hook(struct nft_chain_hook * hook)2325 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2326 {
2327 	struct nft_hook *h, *next;
2328 
2329 	list_for_each_entry_safe(h, next, &hook->list, list) {
2330 		list_del(&h->list);
2331 		kfree(h);
2332 	}
2333 	module_put(hook->type->owner);
2334 }
2335 
nft_last_rule(const struct nft_chain * chain,const void * ptr)2336 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2337 {
2338 	struct nft_rule_dp_last *lrule;
2339 
2340 	BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2341 
2342 	lrule = (struct nft_rule_dp_last *)ptr;
2343 	lrule->end.is_last = 1;
2344 	lrule->chain = chain;
2345 	/* blob size does not include the trailer rule */
2346 }
2347 
nf_tables_chain_alloc_rules(const struct nft_chain * chain,unsigned int size)2348 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2349 							 unsigned int size)
2350 {
2351 	struct nft_rule_blob *blob;
2352 
2353 	if (size > INT_MAX)
2354 		return NULL;
2355 
2356 	size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2357 
2358 	blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2359 	if (!blob)
2360 		return NULL;
2361 
2362 	blob->size = 0;
2363 	nft_last_rule(chain, blob->data);
2364 
2365 	return blob;
2366 }
2367 
nft_basechain_hook_init(struct nf_hook_ops * ops,u8 family,const struct nft_chain_hook * hook,struct nft_chain * chain)2368 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2369 				    const struct nft_chain_hook *hook,
2370 				    struct nft_chain *chain)
2371 {
2372 	ops->pf			= family;
2373 	ops->hooknum		= hook->num;
2374 	ops->priority		= hook->priority;
2375 	ops->priv		= chain;
2376 	ops->hook		= hook->type->hooks[ops->hooknum];
2377 	ops->hook_ops_type	= NF_HOOK_OP_NF_TABLES;
2378 }
2379 
nft_basechain_init(struct nft_base_chain * basechain,u8 family,struct nft_chain_hook * hook,u32 flags)2380 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2381 			      struct nft_chain_hook *hook, u32 flags)
2382 {
2383 	struct nft_chain *chain;
2384 	struct nft_hook *h;
2385 
2386 	basechain->type = hook->type;
2387 	INIT_LIST_HEAD(&basechain->hook_list);
2388 	chain = &basechain->chain;
2389 
2390 	if (nft_base_chain_netdev(family, hook->num)) {
2391 		list_splice_init(&hook->list, &basechain->hook_list);
2392 		list_for_each_entry(h, &basechain->hook_list, list)
2393 			nft_basechain_hook_init(&h->ops, family, hook, chain);
2394 	}
2395 	nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2396 
2397 	chain->flags |= NFT_CHAIN_BASE | flags;
2398 	basechain->policy = NF_ACCEPT;
2399 	if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2400 	    !nft_chain_offload_support(basechain)) {
2401 		list_splice_init(&basechain->hook_list, &hook->list);
2402 		return -EOPNOTSUPP;
2403 	}
2404 
2405 	flow_block_init(&basechain->flow_block);
2406 
2407 	return 0;
2408 }
2409 
nft_chain_add(struct nft_table * table,struct nft_chain * chain)2410 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2411 {
2412 	int err;
2413 
2414 	err = rhltable_insert_key(&table->chains_ht, chain->name,
2415 				  &chain->rhlhead, nft_chain_ht_params);
2416 	if (err)
2417 		return err;
2418 
2419 	list_add_tail_rcu(&chain->list, &table->chains);
2420 
2421 	return 0;
2422 }
2423 
2424 static u64 chain_id;
2425 
nf_tables_addchain(struct nft_ctx * ctx,u8 family,u8 genmask,u8 policy,u32 flags,struct netlink_ext_ack * extack)2426 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2427 			      u8 policy, u32 flags,
2428 			      struct netlink_ext_ack *extack)
2429 {
2430 	const struct nlattr * const *nla = ctx->nla;
2431 	struct nft_table *table = ctx->table;
2432 	struct nft_base_chain *basechain;
2433 	struct net *net = ctx->net;
2434 	char name[NFT_NAME_MAXLEN];
2435 	struct nft_rule_blob *blob;
2436 	struct nft_trans *trans;
2437 	struct nft_chain *chain;
2438 	int err;
2439 
2440 	if (nla[NFTA_CHAIN_HOOK]) {
2441 		struct nft_stats __percpu *stats = NULL;
2442 		struct nft_chain_hook hook = {};
2443 
2444 		if (table->flags & __NFT_TABLE_F_UPDATE)
2445 			return -EINVAL;
2446 
2447 		if (flags & NFT_CHAIN_BINDING)
2448 			return -EOPNOTSUPP;
2449 
2450 		err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
2451 					   extack);
2452 		if (err < 0)
2453 			return err;
2454 
2455 		basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2456 		if (basechain == NULL) {
2457 			nft_chain_release_hook(&hook);
2458 			return -ENOMEM;
2459 		}
2460 		chain = &basechain->chain;
2461 
2462 		if (nla[NFTA_CHAIN_COUNTERS]) {
2463 			stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2464 			if (IS_ERR(stats)) {
2465 				nft_chain_release_hook(&hook);
2466 				kfree(basechain);
2467 				return PTR_ERR(stats);
2468 			}
2469 			rcu_assign_pointer(basechain->stats, stats);
2470 		}
2471 
2472 		err = nft_basechain_init(basechain, family, &hook, flags);
2473 		if (err < 0) {
2474 			nft_chain_release_hook(&hook);
2475 			kfree(basechain);
2476 			free_percpu(stats);
2477 			return err;
2478 		}
2479 		if (stats)
2480 			static_branch_inc(&nft_counters_enabled);
2481 	} else {
2482 		if (flags & NFT_CHAIN_BASE)
2483 			return -EINVAL;
2484 		if (flags & NFT_CHAIN_HW_OFFLOAD)
2485 			return -EOPNOTSUPP;
2486 
2487 		chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2488 		if (chain == NULL)
2489 			return -ENOMEM;
2490 
2491 		chain->flags = flags;
2492 	}
2493 	ctx->chain = chain;
2494 
2495 	INIT_LIST_HEAD(&chain->rules);
2496 	chain->handle = nf_tables_alloc_handle(table);
2497 	chain->table = table;
2498 
2499 	if (nla[NFTA_CHAIN_NAME]) {
2500 		chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2501 	} else {
2502 		if (!(flags & NFT_CHAIN_BINDING)) {
2503 			err = -EINVAL;
2504 			goto err_destroy_chain;
2505 		}
2506 
2507 		snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2508 		chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2509 	}
2510 
2511 	if (!chain->name) {
2512 		err = -ENOMEM;
2513 		goto err_destroy_chain;
2514 	}
2515 
2516 	if (nla[NFTA_CHAIN_USERDATA]) {
2517 		chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2518 		if (chain->udata == NULL) {
2519 			err = -ENOMEM;
2520 			goto err_destroy_chain;
2521 		}
2522 		chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2523 	}
2524 
2525 	blob = nf_tables_chain_alloc_rules(chain, 0);
2526 	if (!blob) {
2527 		err = -ENOMEM;
2528 		goto err_destroy_chain;
2529 	}
2530 
2531 	RCU_INIT_POINTER(chain->blob_gen_0, blob);
2532 	RCU_INIT_POINTER(chain->blob_gen_1, blob);
2533 
2534 	if (!nft_use_inc(&table->use)) {
2535 		err = -EMFILE;
2536 		goto err_destroy_chain;
2537 	}
2538 
2539 	trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2540 	if (IS_ERR(trans)) {
2541 		err = PTR_ERR(trans);
2542 		goto err_trans;
2543 	}
2544 
2545 	nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2546 	if (nft_is_base_chain(chain))
2547 		nft_trans_chain_policy(trans) = policy;
2548 
2549 	err = nft_chain_add(table, chain);
2550 	if (err < 0)
2551 		goto err_chain_add;
2552 
2553 	/* This must be LAST to ensure no packets are walking over this chain. */
2554 	err = nf_tables_register_hook(net, table, chain);
2555 	if (err < 0)
2556 		goto err_register_hook;
2557 
2558 	return 0;
2559 
2560 err_register_hook:
2561 	nft_chain_del(chain);
2562 err_chain_add:
2563 	nft_trans_destroy(trans);
2564 err_trans:
2565 	nft_use_dec_restore(&table->use);
2566 err_destroy_chain:
2567 	nf_tables_chain_destroy(ctx);
2568 
2569 	return err;
2570 }
2571 
nf_tables_updchain(struct nft_ctx * ctx,u8 genmask,u8 policy,u32 flags,const struct nlattr * attr,struct netlink_ext_ack * extack)2572 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2573 			      u32 flags, const struct nlattr *attr,
2574 			      struct netlink_ext_ack *extack)
2575 {
2576 	const struct nlattr * const *nla = ctx->nla;
2577 	struct nft_base_chain *basechain = NULL;
2578 	struct nft_table *table = ctx->table;
2579 	struct nft_chain *chain = ctx->chain;
2580 	struct nft_chain_hook hook = {};
2581 	struct nft_stats *stats = NULL;
2582 	struct nft_hook *h, *next;
2583 	struct nf_hook_ops *ops;
2584 	struct nft_trans *trans;
2585 	bool unregister = false;
2586 	int err;
2587 
2588 	if (chain->flags ^ flags)
2589 		return -EOPNOTSUPP;
2590 
2591 	INIT_LIST_HEAD(&hook.list);
2592 
2593 	if (nla[NFTA_CHAIN_HOOK]) {
2594 		if (!nft_is_base_chain(chain)) {
2595 			NL_SET_BAD_ATTR(extack, attr);
2596 			return -EEXIST;
2597 		}
2598 
2599 		basechain = nft_base_chain(chain);
2600 		err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2601 					   ctx->family, flags, extack);
2602 		if (err < 0)
2603 			return err;
2604 
2605 		if (basechain->type != hook.type) {
2606 			nft_chain_release_hook(&hook);
2607 			NL_SET_BAD_ATTR(extack, attr);
2608 			return -EEXIST;
2609 		}
2610 
2611 		if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2612 			list_for_each_entry_safe(h, next, &hook.list, list) {
2613 				h->ops.pf	= basechain->ops.pf;
2614 				h->ops.hooknum	= basechain->ops.hooknum;
2615 				h->ops.priority	= basechain->ops.priority;
2616 				h->ops.priv	= basechain->ops.priv;
2617 				h->ops.hook	= basechain->ops.hook;
2618 
2619 				if (nft_hook_list_find(&basechain->hook_list, h)) {
2620 					list_del(&h->list);
2621 					kfree(h);
2622 				}
2623 			}
2624 		} else {
2625 			ops = &basechain->ops;
2626 			if (ops->hooknum != hook.num ||
2627 			    ops->priority != hook.priority) {
2628 				nft_chain_release_hook(&hook);
2629 				NL_SET_BAD_ATTR(extack, attr);
2630 				return -EEXIST;
2631 			}
2632 		}
2633 	}
2634 
2635 	if (nla[NFTA_CHAIN_HANDLE] &&
2636 	    nla[NFTA_CHAIN_NAME]) {
2637 		struct nft_chain *chain2;
2638 
2639 		chain2 = nft_chain_lookup(ctx->net, table,
2640 					  nla[NFTA_CHAIN_NAME], genmask);
2641 		if (!IS_ERR(chain2)) {
2642 			NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2643 			err = -EEXIST;
2644 			goto err_hooks;
2645 		}
2646 	}
2647 
2648 	if (table->flags & __NFT_TABLE_F_UPDATE &&
2649 	    !list_empty(&hook.list)) {
2650 		NL_SET_BAD_ATTR(extack, attr);
2651 		err = -EOPNOTSUPP;
2652 		goto err_hooks;
2653 	}
2654 
2655 	if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2656 	    nft_is_base_chain(chain) &&
2657 	    !list_empty(&hook.list)) {
2658 		basechain = nft_base_chain(chain);
2659 		ops = &basechain->ops;
2660 
2661 		if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2662 			err = nft_netdev_register_hooks(ctx->net, &hook.list);
2663 			if (err < 0)
2664 				goto err_hooks;
2665 		}
2666 	}
2667 
2668 	unregister = true;
2669 
2670 	if (nla[NFTA_CHAIN_COUNTERS]) {
2671 		if (!nft_is_base_chain(chain)) {
2672 			err = -EOPNOTSUPP;
2673 			goto err_hooks;
2674 		}
2675 
2676 		stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2677 		if (IS_ERR(stats)) {
2678 			err = PTR_ERR(stats);
2679 			goto err_hooks;
2680 		}
2681 	}
2682 
2683 	err = -ENOMEM;
2684 	trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2685 				sizeof(struct nft_trans_chain));
2686 	if (trans == NULL)
2687 		goto err_trans;
2688 
2689 	nft_trans_chain_stats(trans) = stats;
2690 	nft_trans_chain_update(trans) = true;
2691 
2692 	if (nla[NFTA_CHAIN_POLICY])
2693 		nft_trans_chain_policy(trans) = policy;
2694 	else
2695 		nft_trans_chain_policy(trans) = -1;
2696 
2697 	if (nla[NFTA_CHAIN_HANDLE] &&
2698 	    nla[NFTA_CHAIN_NAME]) {
2699 		struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2700 		struct nft_trans *tmp;
2701 		char *name;
2702 
2703 		err = -ENOMEM;
2704 		name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2705 		if (!name)
2706 			goto err_trans;
2707 
2708 		err = -EEXIST;
2709 		list_for_each_entry(tmp, &nft_net->commit_list, list) {
2710 			if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2711 			    tmp->ctx.table == table &&
2712 			    nft_trans_chain_update(tmp) &&
2713 			    nft_trans_chain_name(tmp) &&
2714 			    strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2715 				NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2716 				kfree(name);
2717 				goto err_trans;
2718 			}
2719 		}
2720 
2721 		nft_trans_chain_name(trans) = name;
2722 	}
2723 
2724 	nft_trans_basechain(trans) = basechain;
2725 	INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2726 	list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2727 	if (nla[NFTA_CHAIN_HOOK])
2728 		module_put(hook.type->owner);
2729 
2730 	nft_trans_commit_list_add_tail(ctx->net, trans);
2731 
2732 	return 0;
2733 
2734 err_trans:
2735 	free_percpu(stats);
2736 	kfree(trans);
2737 err_hooks:
2738 	if (nla[NFTA_CHAIN_HOOK]) {
2739 		list_for_each_entry_safe(h, next, &hook.list, list) {
2740 			if (unregister)
2741 				nf_unregister_net_hook(ctx->net, &h->ops);
2742 			list_del(&h->list);
2743 			kfree_rcu(h, rcu);
2744 		}
2745 		module_put(hook.type->owner);
2746 	}
2747 
2748 	return err;
2749 }
2750 
nft_chain_lookup_byid(const struct net * net,const struct nft_table * table,const struct nlattr * nla,u8 genmask)2751 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2752 					       const struct nft_table *table,
2753 					       const struct nlattr *nla, u8 genmask)
2754 {
2755 	struct nftables_pernet *nft_net = nft_pernet(net);
2756 	u32 id = ntohl(nla_get_be32(nla));
2757 	struct nft_trans *trans;
2758 
2759 	list_for_each_entry(trans, &nft_net->commit_list, list) {
2760 		struct nft_chain *chain = trans->ctx.chain;
2761 
2762 		if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2763 		    chain->table == table &&
2764 		    id == nft_trans_chain_id(trans) &&
2765 		    nft_active_genmask(chain, genmask))
2766 			return chain;
2767 	}
2768 	return ERR_PTR(-ENOENT);
2769 }
2770 
nf_tables_newchain(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])2771 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2772 			      const struct nlattr * const nla[])
2773 {
2774 	struct nftables_pernet *nft_net = nft_pernet(info->net);
2775 	struct netlink_ext_ack *extack = info->extack;
2776 	u8 genmask = nft_genmask_next(info->net);
2777 	u8 family = info->nfmsg->nfgen_family;
2778 	struct nft_chain *chain = NULL;
2779 	struct net *net = info->net;
2780 	const struct nlattr *attr;
2781 	struct nft_table *table;
2782 	u8 policy = NF_ACCEPT;
2783 	struct nft_ctx ctx;
2784 	u64 handle = 0;
2785 	u32 flags = 0;
2786 
2787 	lockdep_assert_held(&nft_net->commit_mutex);
2788 
2789 	table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2790 				 NETLINK_CB(skb).portid);
2791 	if (IS_ERR(table)) {
2792 		NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2793 		return PTR_ERR(table);
2794 	}
2795 
2796 	chain = NULL;
2797 	attr = nla[NFTA_CHAIN_NAME];
2798 
2799 	if (nla[NFTA_CHAIN_HANDLE]) {
2800 		handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2801 		chain = nft_chain_lookup_byhandle(table, handle, genmask);
2802 		if (IS_ERR(chain)) {
2803 			NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2804 			return PTR_ERR(chain);
2805 		}
2806 		attr = nla[NFTA_CHAIN_HANDLE];
2807 	} else if (nla[NFTA_CHAIN_NAME]) {
2808 		chain = nft_chain_lookup(net, table, attr, genmask);
2809 		if (IS_ERR(chain)) {
2810 			if (PTR_ERR(chain) != -ENOENT) {
2811 				NL_SET_BAD_ATTR(extack, attr);
2812 				return PTR_ERR(chain);
2813 			}
2814 			chain = NULL;
2815 		}
2816 	} else if (!nla[NFTA_CHAIN_ID]) {
2817 		return -EINVAL;
2818 	}
2819 
2820 	if (nla[NFTA_CHAIN_POLICY]) {
2821 		if (chain != NULL &&
2822 		    !nft_is_base_chain(chain)) {
2823 			NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2824 			return -EOPNOTSUPP;
2825 		}
2826 
2827 		if (chain == NULL &&
2828 		    nla[NFTA_CHAIN_HOOK] == NULL) {
2829 			NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2830 			return -EOPNOTSUPP;
2831 		}
2832 
2833 		policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2834 		switch (policy) {
2835 		case NF_DROP:
2836 		case NF_ACCEPT:
2837 			break;
2838 		default:
2839 			return -EINVAL;
2840 		}
2841 	}
2842 
2843 	if (nla[NFTA_CHAIN_FLAGS])
2844 		flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2845 	else if (chain)
2846 		flags = chain->flags;
2847 
2848 	if (flags & ~NFT_CHAIN_FLAGS)
2849 		return -EOPNOTSUPP;
2850 
2851 	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2852 
2853 	if (chain != NULL) {
2854 		if (chain->flags & NFT_CHAIN_BINDING)
2855 			return -EINVAL;
2856 
2857 		if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2858 			NL_SET_BAD_ATTR(extack, attr);
2859 			return -EEXIST;
2860 		}
2861 		if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2862 			return -EOPNOTSUPP;
2863 
2864 		flags |= chain->flags & NFT_CHAIN_BASE;
2865 		return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2866 					  extack);
2867 	}
2868 
2869 	return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2870 }
2871 
nft_delchain_hook(struct nft_ctx * ctx,struct nft_base_chain * basechain,struct netlink_ext_ack * extack)2872 static int nft_delchain_hook(struct nft_ctx *ctx,
2873 			     struct nft_base_chain *basechain,
2874 			     struct netlink_ext_ack *extack)
2875 {
2876 	const struct nft_chain *chain = &basechain->chain;
2877 	const struct nlattr * const *nla = ctx->nla;
2878 	struct nft_chain_hook chain_hook = {};
2879 	struct nft_hook *this, *hook;
2880 	LIST_HEAD(chain_del_list);
2881 	struct nft_trans *trans;
2882 	int err;
2883 
2884 	if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
2885 		return -EOPNOTSUPP;
2886 
2887 	err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2888 				   ctx->family, chain->flags, extack);
2889 	if (err < 0)
2890 		return err;
2891 
2892 	list_for_each_entry(this, &chain_hook.list, list) {
2893 		hook = nft_hook_list_find(&basechain->hook_list, this);
2894 		if (!hook) {
2895 			err = -ENOENT;
2896 			goto err_chain_del_hook;
2897 		}
2898 		list_move(&hook->list, &chain_del_list);
2899 	}
2900 
2901 	trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2902 				sizeof(struct nft_trans_chain));
2903 	if (!trans) {
2904 		err = -ENOMEM;
2905 		goto err_chain_del_hook;
2906 	}
2907 
2908 	nft_trans_basechain(trans) = basechain;
2909 	nft_trans_chain_update(trans) = true;
2910 	INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2911 	list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2912 	nft_chain_release_hook(&chain_hook);
2913 
2914 	nft_trans_commit_list_add_tail(ctx->net, trans);
2915 
2916 	return 0;
2917 
2918 err_chain_del_hook:
2919 	list_splice(&chain_del_list, &basechain->hook_list);
2920 	nft_chain_release_hook(&chain_hook);
2921 
2922 	return err;
2923 }
2924 
nf_tables_delchain(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])2925 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2926 			      const struct nlattr * const nla[])
2927 {
2928 	struct netlink_ext_ack *extack = info->extack;
2929 	u8 genmask = nft_genmask_next(info->net);
2930 	u8 family = info->nfmsg->nfgen_family;
2931 	struct net *net = info->net;
2932 	const struct nlattr *attr;
2933 	struct nft_table *table;
2934 	struct nft_chain *chain;
2935 	struct nft_rule *rule;
2936 	struct nft_ctx ctx;
2937 	u64 handle;
2938 	u32 use;
2939 	int err;
2940 
2941 	table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2942 				 NETLINK_CB(skb).portid);
2943 	if (IS_ERR(table)) {
2944 		NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2945 		return PTR_ERR(table);
2946 	}
2947 
2948 	if (nla[NFTA_CHAIN_HANDLE]) {
2949 		attr = nla[NFTA_CHAIN_HANDLE];
2950 		handle = be64_to_cpu(nla_get_be64(attr));
2951 		chain = nft_chain_lookup_byhandle(table, handle, genmask);
2952 	} else {
2953 		attr = nla[NFTA_CHAIN_NAME];
2954 		chain = nft_chain_lookup(net, table, attr, genmask);
2955 	}
2956 	if (IS_ERR(chain)) {
2957 		if (PTR_ERR(chain) == -ENOENT &&
2958 		    NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2959 			return 0;
2960 
2961 		NL_SET_BAD_ATTR(extack, attr);
2962 		return PTR_ERR(chain);
2963 	}
2964 
2965 	if (nft_chain_binding(chain))
2966 		return -EOPNOTSUPP;
2967 
2968 	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2969 
2970 	if (nla[NFTA_CHAIN_HOOK]) {
2971 		if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN ||
2972 		    chain->flags & NFT_CHAIN_HW_OFFLOAD)
2973 			return -EOPNOTSUPP;
2974 
2975 		if (nft_is_base_chain(chain)) {
2976 			struct nft_base_chain *basechain = nft_base_chain(chain);
2977 
2978 			if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2979 				return nft_delchain_hook(&ctx, basechain, extack);
2980 		}
2981 	}
2982 
2983 	if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2984 	    chain->use > 0)
2985 		return -EBUSY;
2986 
2987 	use = chain->use;
2988 	list_for_each_entry(rule, &chain->rules, list) {
2989 		if (!nft_is_active_next(net, rule))
2990 			continue;
2991 		use--;
2992 
2993 		err = nft_delrule(&ctx, rule);
2994 		if (err < 0)
2995 			return err;
2996 	}
2997 
2998 	/* There are rules and elements that are still holding references to us,
2999 	 * we cannot do a recursive removal in this case.
3000 	 */
3001 	if (use > 0) {
3002 		NL_SET_BAD_ATTR(extack, attr);
3003 		return -EBUSY;
3004 	}
3005 
3006 	return nft_delchain(&ctx);
3007 }
3008 
3009 /*
3010  * Expressions
3011  */
3012 
3013 /**
3014  *	nft_register_expr - register nf_tables expr type
3015  *	@type: expr type
3016  *
3017  *	Registers the expr type for use with nf_tables. Returns zero on
3018  *	success or a negative errno code otherwise.
3019  */
nft_register_expr(struct nft_expr_type * type)3020 int nft_register_expr(struct nft_expr_type *type)
3021 {
3022 	nfnl_lock(NFNL_SUBSYS_NFTABLES);
3023 	if (type->family == NFPROTO_UNSPEC)
3024 		list_add_tail_rcu(&type->list, &nf_tables_expressions);
3025 	else
3026 		list_add_rcu(&type->list, &nf_tables_expressions);
3027 	nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3028 	return 0;
3029 }
3030 EXPORT_SYMBOL_GPL(nft_register_expr);
3031 
3032 /**
3033  *	nft_unregister_expr - unregister nf_tables expr type
3034  *	@type: expr type
3035  *
3036  * 	Unregisters the expr typefor use with nf_tables.
3037  */
nft_unregister_expr(struct nft_expr_type * type)3038 void nft_unregister_expr(struct nft_expr_type *type)
3039 {
3040 	nfnl_lock(NFNL_SUBSYS_NFTABLES);
3041 	list_del_rcu(&type->list);
3042 	nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3043 }
3044 EXPORT_SYMBOL_GPL(nft_unregister_expr);
3045 
__nft_expr_type_get(u8 family,struct nlattr * nla)3046 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
3047 						       struct nlattr *nla)
3048 {
3049 	const struct nft_expr_type *type, *candidate = NULL;
3050 
3051 	list_for_each_entry_rcu(type, &nf_tables_expressions, list) {
3052 		if (!nla_strcmp(nla, type->name)) {
3053 			if (!type->family && !candidate)
3054 				candidate = type;
3055 			else if (type->family == family)
3056 				candidate = type;
3057 		}
3058 	}
3059 	return candidate;
3060 }
3061 
3062 #ifdef CONFIG_MODULES
nft_expr_type_request_module(struct net * net,u8 family,struct nlattr * nla)3063 static int nft_expr_type_request_module(struct net *net, u8 family,
3064 					struct nlattr *nla)
3065 {
3066 	if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3067 			       nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3068 		return -EAGAIN;
3069 
3070 	return 0;
3071 }
3072 #endif
3073 
nft_expr_type_get(struct net * net,u8 family,struct nlattr * nla)3074 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3075 						     u8 family,
3076 						     struct nlattr *nla)
3077 {
3078 	const struct nft_expr_type *type;
3079 
3080 	if (nla == NULL)
3081 		return ERR_PTR(-EINVAL);
3082 
3083 	rcu_read_lock();
3084 	type = __nft_expr_type_get(family, nla);
3085 	if (type != NULL && try_module_get(type->owner)) {
3086 		rcu_read_unlock();
3087 		return type;
3088 	}
3089 	rcu_read_unlock();
3090 
3091 	lockdep_nfnl_nft_mutex_not_held();
3092 #ifdef CONFIG_MODULES
3093 	if (type == NULL) {
3094 		if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3095 			return ERR_PTR(-EAGAIN);
3096 
3097 		if (nft_request_module(net, "nft-expr-%.*s",
3098 				       nla_len(nla),
3099 				       (char *)nla_data(nla)) == -EAGAIN)
3100 			return ERR_PTR(-EAGAIN);
3101 	}
3102 #endif
3103 	return ERR_PTR(-ENOENT);
3104 }
3105 
3106 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3107 	[NFTA_EXPR_NAME]	= { .type = NLA_STRING,
3108 				    .len = NFT_MODULE_AUTOLOAD_LIMIT },
3109 	[NFTA_EXPR_DATA]	= { .type = NLA_NESTED },
3110 };
3111 
nf_tables_fill_expr_info(struct sk_buff * skb,const struct nft_expr * expr,bool reset)3112 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3113 				    const struct nft_expr *expr, bool reset)
3114 {
3115 	if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3116 		goto nla_put_failure;
3117 
3118 	if (expr->ops->dump) {
3119 		struct nlattr *data = nla_nest_start_noflag(skb,
3120 							    NFTA_EXPR_DATA);
3121 		if (data == NULL)
3122 			goto nla_put_failure;
3123 		if (expr->ops->dump(skb, expr, reset) < 0)
3124 			goto nla_put_failure;
3125 		nla_nest_end(skb, data);
3126 	}
3127 
3128 	return skb->len;
3129 
3130 nla_put_failure:
3131 	return -1;
3132 };
3133 
nft_expr_dump(struct sk_buff * skb,unsigned int attr,const struct nft_expr * expr,bool reset)3134 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3135 		  const struct nft_expr *expr, bool reset)
3136 {
3137 	struct nlattr *nest;
3138 
3139 	nest = nla_nest_start_noflag(skb, attr);
3140 	if (!nest)
3141 		goto nla_put_failure;
3142 	if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3143 		goto nla_put_failure;
3144 	nla_nest_end(skb, nest);
3145 	return 0;
3146 
3147 nla_put_failure:
3148 	return -1;
3149 }
3150 
3151 struct nft_expr_info {
3152 	const struct nft_expr_ops	*ops;
3153 	const struct nlattr		*attr;
3154 	struct nlattr			*tb[NFT_EXPR_MAXATTR + 1];
3155 };
3156 
nf_tables_expr_parse(const struct nft_ctx * ctx,const struct nlattr * nla,struct nft_expr_info * info)3157 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3158 				const struct nlattr *nla,
3159 				struct nft_expr_info *info)
3160 {
3161 	const struct nft_expr_type *type;
3162 	const struct nft_expr_ops *ops;
3163 	struct nlattr *tb[NFTA_EXPR_MAX + 1];
3164 	int err;
3165 
3166 	err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3167 					  nft_expr_policy, NULL);
3168 	if (err < 0)
3169 		return err;
3170 
3171 	type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3172 	if (IS_ERR(type))
3173 		return PTR_ERR(type);
3174 
3175 	if (tb[NFTA_EXPR_DATA]) {
3176 		err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3177 						  tb[NFTA_EXPR_DATA],
3178 						  type->policy, NULL);
3179 		if (err < 0)
3180 			goto err1;
3181 	} else
3182 		memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3183 
3184 	if (type->select_ops != NULL) {
3185 		ops = type->select_ops(ctx,
3186 				       (const struct nlattr * const *)info->tb);
3187 		if (IS_ERR(ops)) {
3188 			err = PTR_ERR(ops);
3189 #ifdef CONFIG_MODULES
3190 			if (err == -EAGAIN)
3191 				if (nft_expr_type_request_module(ctx->net,
3192 								 ctx->family,
3193 								 tb[NFTA_EXPR_NAME]) != -EAGAIN)
3194 					err = -ENOENT;
3195 #endif
3196 			goto err1;
3197 		}
3198 	} else
3199 		ops = type->ops;
3200 
3201 	info->attr = nla;
3202 	info->ops = ops;
3203 
3204 	return 0;
3205 
3206 err1:
3207 	module_put(type->owner);
3208 	return err;
3209 }
3210 
nft_expr_inner_parse(const struct nft_ctx * ctx,const struct nlattr * nla,struct nft_expr_info * info)3211 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3212 			 struct nft_expr_info *info)
3213 {
3214 	struct nlattr *tb[NFTA_EXPR_MAX + 1];
3215 	const struct nft_expr_type *type;
3216 	int err;
3217 
3218 	err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3219 					  nft_expr_policy, NULL);
3220 	if (err < 0)
3221 		return err;
3222 
3223 	if (!tb[NFTA_EXPR_DATA] || !tb[NFTA_EXPR_NAME])
3224 		return -EINVAL;
3225 
3226 	type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3227 	if (!type)
3228 		return -ENOENT;
3229 
3230 	if (!type->inner_ops)
3231 		return -EOPNOTSUPP;
3232 
3233 	err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3234 					  tb[NFTA_EXPR_DATA],
3235 					  type->policy, NULL);
3236 	if (err < 0)
3237 		goto err_nla_parse;
3238 
3239 	info->attr = nla;
3240 	info->ops = type->inner_ops;
3241 
3242 	return 0;
3243 
3244 err_nla_parse:
3245 	return err;
3246 }
3247 
nf_tables_newexpr(const struct nft_ctx * ctx,const struct nft_expr_info * expr_info,struct nft_expr * expr)3248 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3249 			     const struct nft_expr_info *expr_info,
3250 			     struct nft_expr *expr)
3251 {
3252 	const struct nft_expr_ops *ops = expr_info->ops;
3253 	int err;
3254 
3255 	expr->ops = ops;
3256 	if (ops->init) {
3257 		err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3258 		if (err < 0)
3259 			goto err1;
3260 	}
3261 
3262 	return 0;
3263 err1:
3264 	expr->ops = NULL;
3265 	return err;
3266 }
3267 
nf_tables_expr_destroy(const struct nft_ctx * ctx,struct nft_expr * expr)3268 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3269 				   struct nft_expr *expr)
3270 {
3271 	const struct nft_expr_type *type = expr->ops->type;
3272 
3273 	if (expr->ops->destroy)
3274 		expr->ops->destroy(ctx, expr);
3275 	module_put(type->owner);
3276 }
3277 
nft_expr_init(const struct nft_ctx * ctx,const struct nlattr * nla)3278 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3279 				      const struct nlattr *nla)
3280 {
3281 	struct nft_expr_info expr_info;
3282 	struct nft_expr *expr;
3283 	struct module *owner;
3284 	int err;
3285 
3286 	err = nf_tables_expr_parse(ctx, nla, &expr_info);
3287 	if (err < 0)
3288 		goto err_expr_parse;
3289 
3290 	err = -EOPNOTSUPP;
3291 	if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3292 		goto err_expr_stateful;
3293 
3294 	err = -ENOMEM;
3295 	expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3296 	if (expr == NULL)
3297 		goto err_expr_stateful;
3298 
3299 	err = nf_tables_newexpr(ctx, &expr_info, expr);
3300 	if (err < 0)
3301 		goto err_expr_new;
3302 
3303 	return expr;
3304 err_expr_new:
3305 	kfree(expr);
3306 err_expr_stateful:
3307 	owner = expr_info.ops->type->owner;
3308 	if (expr_info.ops->type->release_ops)
3309 		expr_info.ops->type->release_ops(expr_info.ops);
3310 
3311 	module_put(owner);
3312 err_expr_parse:
3313 	return ERR_PTR(err);
3314 }
3315 
nft_expr_clone(struct nft_expr * dst,struct nft_expr * src)3316 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3317 {
3318 	int err;
3319 
3320 	if (src->ops->clone) {
3321 		dst->ops = src->ops;
3322 		err = src->ops->clone(dst, src);
3323 		if (err < 0)
3324 			return err;
3325 	} else {
3326 		memcpy(dst, src, src->ops->size);
3327 	}
3328 
3329 	__module_get(src->ops->type->owner);
3330 
3331 	return 0;
3332 }
3333 
nft_expr_destroy(const struct nft_ctx * ctx,struct nft_expr * expr)3334 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3335 {
3336 	nf_tables_expr_destroy(ctx, expr);
3337 	kfree(expr);
3338 }
3339 
3340 /*
3341  * Rules
3342  */
3343 
__nft_rule_lookup(const struct nft_chain * chain,u64 handle)3344 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3345 					  u64 handle)
3346 {
3347 	struct nft_rule *rule;
3348 
3349 	// FIXME: this sucks
3350 	list_for_each_entry_rcu(rule, &chain->rules, list) {
3351 		if (handle == rule->handle)
3352 			return rule;
3353 	}
3354 
3355 	return ERR_PTR(-ENOENT);
3356 }
3357 
nft_rule_lookup(const struct nft_chain * chain,const struct nlattr * nla)3358 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3359 					const struct nlattr *nla)
3360 {
3361 	if (nla == NULL)
3362 		return ERR_PTR(-EINVAL);
3363 
3364 	return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3365 }
3366 
3367 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3368 	[NFTA_RULE_TABLE]	= { .type = NLA_STRING,
3369 				    .len = NFT_TABLE_MAXNAMELEN - 1 },
3370 	[NFTA_RULE_CHAIN]	= { .type = NLA_STRING,
3371 				    .len = NFT_CHAIN_MAXNAMELEN - 1 },
3372 	[NFTA_RULE_HANDLE]	= { .type = NLA_U64 },
3373 	[NFTA_RULE_EXPRESSIONS]	= { .type = NLA_NESTED },
3374 	[NFTA_RULE_COMPAT]	= { .type = NLA_NESTED },
3375 	[NFTA_RULE_POSITION]	= { .type = NLA_U64 },
3376 	[NFTA_RULE_USERDATA]	= { .type = NLA_BINARY,
3377 				    .len = NFT_USERDATA_MAXLEN },
3378 	[NFTA_RULE_ID]		= { .type = NLA_U32 },
3379 	[NFTA_RULE_POSITION_ID]	= { .type = NLA_U32 },
3380 	[NFTA_RULE_CHAIN_ID]	= { .type = NLA_U32 },
3381 };
3382 
nf_tables_fill_rule_info(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,int event,u32 flags,int family,const struct nft_table * table,const struct nft_chain * chain,const struct nft_rule * rule,u64 handle,bool reset)3383 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3384 				    u32 portid, u32 seq, int event,
3385 				    u32 flags, int family,
3386 				    const struct nft_table *table,
3387 				    const struct nft_chain *chain,
3388 				    const struct nft_rule *rule, u64 handle,
3389 				    bool reset)
3390 {
3391 	struct nlmsghdr *nlh;
3392 	const struct nft_expr *expr, *next;
3393 	struct nlattr *list;
3394 	u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3395 
3396 	nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3397 			   nft_base_seq(net));
3398 	if (!nlh)
3399 		goto nla_put_failure;
3400 
3401 	if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3402 		goto nla_put_failure;
3403 	if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3404 		goto nla_put_failure;
3405 	if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3406 			 NFTA_RULE_PAD))
3407 		goto nla_put_failure;
3408 
3409 	if (event != NFT_MSG_DELRULE && handle) {
3410 		if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3411 				 NFTA_RULE_PAD))
3412 			goto nla_put_failure;
3413 	}
3414 
3415 	if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3416 		nft_flow_rule_stats(chain, rule);
3417 
3418 	list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3419 	if (list == NULL)
3420 		goto nla_put_failure;
3421 	nft_rule_for_each_expr(expr, next, rule) {
3422 		if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3423 			goto nla_put_failure;
3424 	}
3425 	nla_nest_end(skb, list);
3426 
3427 	if (rule->udata) {
3428 		struct nft_userdata *udata = nft_userdata(rule);
3429 		if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3430 			    udata->data) < 0)
3431 			goto nla_put_failure;
3432 	}
3433 
3434 	nlmsg_end(skb, nlh);
3435 	return 0;
3436 
3437 nla_put_failure:
3438 	nlmsg_trim(skb, nlh);
3439 	return -1;
3440 }
3441 
nf_tables_rule_notify(const struct nft_ctx * ctx,const struct nft_rule * rule,int event)3442 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3443 				  const struct nft_rule *rule, int event)
3444 {
3445 	struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3446 	const struct nft_rule *prule;
3447 	struct sk_buff *skb;
3448 	u64 handle = 0;
3449 	u16 flags = 0;
3450 	int err;
3451 
3452 	if (!ctx->report &&
3453 	    !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3454 		return;
3455 
3456 	skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3457 	if (skb == NULL)
3458 		goto err;
3459 
3460 	if (event == NFT_MSG_NEWRULE &&
3461 	    !list_is_first(&rule->list, &ctx->chain->rules) &&
3462 	    !list_is_last(&rule->list, &ctx->chain->rules)) {
3463 		prule = list_prev_entry(rule, list);
3464 		handle = prule->handle;
3465 	}
3466 	if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3467 		flags |= NLM_F_APPEND;
3468 	if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3469 		flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3470 
3471 	err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3472 				       event, flags, ctx->family, ctx->table,
3473 				       ctx->chain, rule, handle, false);
3474 	if (err < 0) {
3475 		kfree_skb(skb);
3476 		goto err;
3477 	}
3478 
3479 	nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3480 	return;
3481 err:
3482 	nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3483 }
3484 
audit_log_rule_reset(const struct nft_table * table,unsigned int base_seq,unsigned int nentries)3485 static void audit_log_rule_reset(const struct nft_table *table,
3486 				 unsigned int base_seq,
3487 				 unsigned int nentries)
3488 {
3489 	char *buf = kasprintf(GFP_ATOMIC, "%s:%u",
3490 			      table->name, base_seq);
3491 
3492 	audit_log_nfcfg(buf, table->family, nentries,
3493 			AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3494 	kfree(buf);
3495 }
3496 
3497 struct nft_rule_dump_ctx {
3498 	char *table;
3499 	char *chain;
3500 };
3501 
__nf_tables_dump_rules(struct sk_buff * skb,unsigned int * idx,struct netlink_callback * cb,const struct nft_table * table,const struct nft_chain * chain,bool reset)3502 static int __nf_tables_dump_rules(struct sk_buff *skb,
3503 				  unsigned int *idx,
3504 				  struct netlink_callback *cb,
3505 				  const struct nft_table *table,
3506 				  const struct nft_chain *chain,
3507 				  bool reset)
3508 {
3509 	struct net *net = sock_net(skb->sk);
3510 	const struct nft_rule *rule, *prule;
3511 	unsigned int s_idx = cb->args[0];
3512 	unsigned int entries = 0;
3513 	int ret = 0;
3514 	u64 handle;
3515 
3516 	prule = NULL;
3517 	list_for_each_entry_rcu(rule, &chain->rules, list) {
3518 		if (!nft_is_active(net, rule))
3519 			goto cont_skip;
3520 		if (*idx < s_idx)
3521 			goto cont;
3522 		if (prule)
3523 			handle = prule->handle;
3524 		else
3525 			handle = 0;
3526 
3527 		if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3528 					cb->nlh->nlmsg_seq,
3529 					NFT_MSG_NEWRULE,
3530 					NLM_F_MULTI | NLM_F_APPEND,
3531 					table->family,
3532 					table, chain, rule, handle, reset) < 0) {
3533 			ret = 1;
3534 			break;
3535 		}
3536 		entries++;
3537 		nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3538 cont:
3539 		prule = rule;
3540 cont_skip:
3541 		(*idx)++;
3542 	}
3543 
3544 	if (reset && entries)
3545 		audit_log_rule_reset(table, cb->seq, entries);
3546 
3547 	return ret;
3548 }
3549 
nf_tables_dump_rules(struct sk_buff * skb,struct netlink_callback * cb)3550 static int nf_tables_dump_rules(struct sk_buff *skb,
3551 				struct netlink_callback *cb)
3552 {
3553 	const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3554 	const struct nft_rule_dump_ctx *ctx = cb->data;
3555 	struct nft_table *table;
3556 	const struct nft_chain *chain;
3557 	unsigned int idx = 0;
3558 	struct net *net = sock_net(skb->sk);
3559 	int family = nfmsg->nfgen_family;
3560 	struct nftables_pernet *nft_net;
3561 	bool reset = false;
3562 
3563 	if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3564 		reset = true;
3565 
3566 	rcu_read_lock();
3567 	nft_net = nft_pernet(net);
3568 	cb->seq = READ_ONCE(nft_net->base_seq);
3569 
3570 	list_for_each_entry_rcu(table, &nft_net->tables, list) {
3571 		if (family != NFPROTO_UNSPEC && family != table->family)
3572 			continue;
3573 
3574 		if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3575 			continue;
3576 
3577 		if (ctx && ctx->table && ctx->chain) {
3578 			struct rhlist_head *list, *tmp;
3579 
3580 			list = rhltable_lookup(&table->chains_ht, ctx->chain,
3581 					       nft_chain_ht_params);
3582 			if (!list)
3583 				goto done;
3584 
3585 			rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3586 				if (!nft_is_active(net, chain))
3587 					continue;
3588 				__nf_tables_dump_rules(skb, &idx,
3589 						       cb, table, chain, reset);
3590 				break;
3591 			}
3592 			goto done;
3593 		}
3594 
3595 		list_for_each_entry_rcu(chain, &table->chains, list) {
3596 			if (__nf_tables_dump_rules(skb, &idx,
3597 						   cb, table, chain, reset))
3598 				goto done;
3599 		}
3600 
3601 		if (ctx && ctx->table)
3602 			break;
3603 	}
3604 done:
3605 	rcu_read_unlock();
3606 
3607 	cb->args[0] = idx;
3608 	return skb->len;
3609 }
3610 
nf_tables_dump_rules_start(struct netlink_callback * cb)3611 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3612 {
3613 	const struct nlattr * const *nla = cb->data;
3614 	struct nft_rule_dump_ctx *ctx = NULL;
3615 
3616 	if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3617 		ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3618 		if (!ctx)
3619 			return -ENOMEM;
3620 
3621 		if (nla[NFTA_RULE_TABLE]) {
3622 			ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3623 							GFP_ATOMIC);
3624 			if (!ctx->table) {
3625 				kfree(ctx);
3626 				return -ENOMEM;
3627 			}
3628 		}
3629 		if (nla[NFTA_RULE_CHAIN]) {
3630 			ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3631 						GFP_ATOMIC);
3632 			if (!ctx->chain) {
3633 				kfree(ctx->table);
3634 				kfree(ctx);
3635 				return -ENOMEM;
3636 			}
3637 		}
3638 	}
3639 
3640 	cb->data = ctx;
3641 	return 0;
3642 }
3643 
nf_tables_dump_rules_done(struct netlink_callback * cb)3644 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3645 {
3646 	struct nft_rule_dump_ctx *ctx = cb->data;
3647 
3648 	if (ctx) {
3649 		kfree(ctx->table);
3650 		kfree(ctx->chain);
3651 		kfree(ctx);
3652 	}
3653 	return 0;
3654 }
3655 
3656 /* called with rcu_read_lock held */
nf_tables_getrule(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])3657 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3658 			     const struct nlattr * const nla[])
3659 {
3660 	struct netlink_ext_ack *extack = info->extack;
3661 	u8 genmask = nft_genmask_cur(info->net);
3662 	u8 family = info->nfmsg->nfgen_family;
3663 	const struct nft_chain *chain;
3664 	const struct nft_rule *rule;
3665 	struct net *net = info->net;
3666 	struct nft_table *table;
3667 	struct sk_buff *skb2;
3668 	bool reset = false;
3669 	int err;
3670 
3671 	if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3672 		struct netlink_dump_control c = {
3673 			.start= nf_tables_dump_rules_start,
3674 			.dump = nf_tables_dump_rules,
3675 			.done = nf_tables_dump_rules_done,
3676 			.module = THIS_MODULE,
3677 			.data = (void *)nla,
3678 		};
3679 
3680 		return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3681 	}
3682 
3683 	table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3684 	if (IS_ERR(table)) {
3685 		NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3686 		return PTR_ERR(table);
3687 	}
3688 
3689 	chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3690 	if (IS_ERR(chain)) {
3691 		NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3692 		return PTR_ERR(chain);
3693 	}
3694 
3695 	rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3696 	if (IS_ERR(rule)) {
3697 		NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3698 		return PTR_ERR(rule);
3699 	}
3700 
3701 	skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3702 	if (!skb2)
3703 		return -ENOMEM;
3704 
3705 	if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3706 		reset = true;
3707 
3708 	err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3709 				       info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3710 				       family, table, chain, rule, 0, reset);
3711 	if (err < 0)
3712 		goto err_fill_rule_info;
3713 
3714 	if (reset)
3715 		audit_log_rule_reset(table, nft_pernet(net)->base_seq, 1);
3716 
3717 	return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3718 
3719 err_fill_rule_info:
3720 	kfree_skb(skb2);
3721 	return err;
3722 }
3723 
nf_tables_rule_destroy(const struct nft_ctx * ctx,struct nft_rule * rule)3724 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3725 {
3726 	struct nft_expr *expr, *next;
3727 
3728 	/*
3729 	 * Careful: some expressions might not be initialized in case this
3730 	 * is called on error from nf_tables_newrule().
3731 	 */
3732 	expr = nft_expr_first(rule);
3733 	while (nft_expr_more(rule, expr)) {
3734 		next = nft_expr_next(expr);
3735 		nf_tables_expr_destroy(ctx, expr);
3736 		expr = next;
3737 	}
3738 	kfree(rule);
3739 }
3740 
nf_tables_rule_release(const struct nft_ctx * ctx,struct nft_rule * rule)3741 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3742 {
3743 	nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3744 	nf_tables_rule_destroy(ctx, rule);
3745 }
3746 
3747 /** nft_chain_validate - loop detection and hook validation
3748  *
3749  * @ctx: context containing call depth and base chain
3750  * @chain: chain to validate
3751  *
3752  * Walk through the rules of the given chain and chase all jumps/gotos
3753  * and set lookups until either the jump limit is hit or all reachable
3754  * chains have been validated.
3755  */
nft_chain_validate(const struct nft_ctx * ctx,const struct nft_chain * chain)3756 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3757 {
3758 	struct nft_expr *expr, *last;
3759 	const struct nft_data *data;
3760 	struct nft_rule *rule;
3761 	int err;
3762 
3763 	if (ctx->level == NFT_JUMP_STACK_SIZE)
3764 		return -EMLINK;
3765 
3766 	list_for_each_entry(rule, &chain->rules, list) {
3767 		if (fatal_signal_pending(current))
3768 			return -EINTR;
3769 
3770 		if (!nft_is_active_next(ctx->net, rule))
3771 			continue;
3772 
3773 		nft_rule_for_each_expr(expr, last, rule) {
3774 			if (!expr->ops->validate)
3775 				continue;
3776 
3777 			/* This may call nft_chain_validate() recursively,
3778 			 * callers that do so must increment ctx->level.
3779 			 */
3780 			err = expr->ops->validate(ctx, expr, &data);
3781 			if (err < 0)
3782 				return err;
3783 		}
3784 	}
3785 
3786 	return 0;
3787 }
3788 EXPORT_SYMBOL_GPL(nft_chain_validate);
3789 
nft_table_validate(struct net * net,const struct nft_table * table)3790 static int nft_table_validate(struct net *net, const struct nft_table *table)
3791 {
3792 	struct nft_chain *chain;
3793 	struct nft_ctx ctx = {
3794 		.net	= net,
3795 		.family	= table->family,
3796 	};
3797 	int err;
3798 
3799 	list_for_each_entry(chain, &table->chains, list) {
3800 		if (!nft_is_base_chain(chain))
3801 			continue;
3802 
3803 		ctx.chain = chain;
3804 		err = nft_chain_validate(&ctx, chain);
3805 		if (err < 0)
3806 			return err;
3807 
3808 		cond_resched();
3809 	}
3810 
3811 	return 0;
3812 }
3813 
nft_setelem_validate(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)3814 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3815 			 const struct nft_set_iter *iter,
3816 			 struct nft_set_elem *elem)
3817 {
3818 	const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3819 	struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3820 	const struct nft_data *data;
3821 	int err;
3822 
3823 	if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3824 	    *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3825 		return 0;
3826 
3827 	data = nft_set_ext_data(ext);
3828 	switch (data->verdict.code) {
3829 	case NFT_JUMP:
3830 	case NFT_GOTO:
3831 		pctx->level++;
3832 		err = nft_chain_validate(ctx, data->verdict.chain);
3833 		if (err < 0)
3834 			return err;
3835 		pctx->level--;
3836 		break;
3837 	default:
3838 		break;
3839 	}
3840 
3841 	return 0;
3842 }
3843 
nft_set_catchall_validate(const struct nft_ctx * ctx,struct nft_set * set)3844 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3845 {
3846 	u8 genmask = nft_genmask_next(ctx->net);
3847 	struct nft_set_elem_catchall *catchall;
3848 	struct nft_set_elem elem;
3849 	struct nft_set_ext *ext;
3850 	int ret = 0;
3851 
3852 	list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3853 		ext = nft_set_elem_ext(set, catchall->elem);
3854 		if (!nft_set_elem_active(ext, genmask))
3855 			continue;
3856 
3857 		elem.priv = catchall->elem;
3858 		ret = nft_setelem_validate(ctx, set, NULL, &elem);
3859 		if (ret < 0)
3860 			return ret;
3861 	}
3862 
3863 	return ret;
3864 }
3865 
3866 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3867 					     const struct nft_chain *chain,
3868 					     const struct nlattr *nla);
3869 
3870 #define NFT_RULE_MAXEXPRS	128
3871 
nf_tables_newrule(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])3872 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3873 			     const struct nlattr * const nla[])
3874 {
3875 	struct nftables_pernet *nft_net = nft_pernet(info->net);
3876 	struct netlink_ext_ack *extack = info->extack;
3877 	unsigned int size, i, n, ulen = 0, usize = 0;
3878 	u8 genmask = nft_genmask_next(info->net);
3879 	struct nft_rule *rule, *old_rule = NULL;
3880 	struct nft_expr_info *expr_info = NULL;
3881 	u8 family = info->nfmsg->nfgen_family;
3882 	struct nft_flow_rule *flow = NULL;
3883 	struct net *net = info->net;
3884 	struct nft_userdata *udata;
3885 	struct nft_table *table;
3886 	struct nft_chain *chain;
3887 	struct nft_trans *trans;
3888 	u64 handle, pos_handle;
3889 	struct nft_expr *expr;
3890 	struct nft_ctx ctx;
3891 	struct nlattr *tmp;
3892 	int err, rem;
3893 
3894 	lockdep_assert_held(&nft_net->commit_mutex);
3895 
3896 	table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3897 				 NETLINK_CB(skb).portid);
3898 	if (IS_ERR(table)) {
3899 		NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3900 		return PTR_ERR(table);
3901 	}
3902 
3903 	if (nla[NFTA_RULE_CHAIN]) {
3904 		chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3905 					 genmask);
3906 		if (IS_ERR(chain)) {
3907 			NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3908 			return PTR_ERR(chain);
3909 		}
3910 
3911 	} else if (nla[NFTA_RULE_CHAIN_ID]) {
3912 		chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
3913 					      genmask);
3914 		if (IS_ERR(chain)) {
3915 			NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3916 			return PTR_ERR(chain);
3917 		}
3918 	} else {
3919 		return -EINVAL;
3920 	}
3921 
3922 	if (nft_chain_is_bound(chain))
3923 		return -EOPNOTSUPP;
3924 
3925 	if (nla[NFTA_RULE_HANDLE]) {
3926 		handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3927 		rule = __nft_rule_lookup(chain, handle);
3928 		if (IS_ERR(rule)) {
3929 			NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3930 			return PTR_ERR(rule);
3931 		}
3932 
3933 		if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3934 			NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3935 			return -EEXIST;
3936 		}
3937 		if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3938 			old_rule = rule;
3939 		else
3940 			return -EOPNOTSUPP;
3941 	} else {
3942 		if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3943 		    info->nlh->nlmsg_flags & NLM_F_REPLACE)
3944 			return -EINVAL;
3945 		handle = nf_tables_alloc_handle(table);
3946 
3947 		if (nla[NFTA_RULE_POSITION]) {
3948 			pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3949 			old_rule = __nft_rule_lookup(chain, pos_handle);
3950 			if (IS_ERR(old_rule)) {
3951 				NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3952 				return PTR_ERR(old_rule);
3953 			}
3954 		} else if (nla[NFTA_RULE_POSITION_ID]) {
3955 			old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3956 			if (IS_ERR(old_rule)) {
3957 				NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3958 				return PTR_ERR(old_rule);
3959 			}
3960 		}
3961 	}
3962 
3963 	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3964 
3965 	n = 0;
3966 	size = 0;
3967 	if (nla[NFTA_RULE_EXPRESSIONS]) {
3968 		expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3969 					   sizeof(struct nft_expr_info),
3970 					   GFP_KERNEL);
3971 		if (!expr_info)
3972 			return -ENOMEM;
3973 
3974 		nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3975 			err = -EINVAL;
3976 			if (nla_type(tmp) != NFTA_LIST_ELEM)
3977 				goto err_release_expr;
3978 			if (n == NFT_RULE_MAXEXPRS)
3979 				goto err_release_expr;
3980 			err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3981 			if (err < 0) {
3982 				NL_SET_BAD_ATTR(extack, tmp);
3983 				goto err_release_expr;
3984 			}
3985 			size += expr_info[n].ops->size;
3986 			n++;
3987 		}
3988 	}
3989 	/* Check for overflow of dlen field */
3990 	err = -EFBIG;
3991 	if (size >= 1 << 12)
3992 		goto err_release_expr;
3993 
3994 	if (nla[NFTA_RULE_USERDATA]) {
3995 		ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3996 		if (ulen > 0)
3997 			usize = sizeof(struct nft_userdata) + ulen;
3998 	}
3999 
4000 	err = -ENOMEM;
4001 	rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
4002 	if (rule == NULL)
4003 		goto err_release_expr;
4004 
4005 	nft_activate_next(net, rule);
4006 
4007 	rule->handle = handle;
4008 	rule->dlen   = size;
4009 	rule->udata  = ulen ? 1 : 0;
4010 
4011 	if (ulen) {
4012 		udata = nft_userdata(rule);
4013 		udata->len = ulen - 1;
4014 		nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
4015 	}
4016 
4017 	expr = nft_expr_first(rule);
4018 	for (i = 0; i < n; i++) {
4019 		err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
4020 		if (err < 0) {
4021 			NL_SET_BAD_ATTR(extack, expr_info[i].attr);
4022 			goto err_release_rule;
4023 		}
4024 
4025 		if (expr_info[i].ops->validate)
4026 			nft_validate_state_update(table, NFT_VALIDATE_NEED);
4027 
4028 		expr_info[i].ops = NULL;
4029 		expr = nft_expr_next(expr);
4030 	}
4031 
4032 	if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
4033 		flow = nft_flow_rule_create(net, rule);
4034 		if (IS_ERR(flow)) {
4035 			err = PTR_ERR(flow);
4036 			goto err_release_rule;
4037 		}
4038 	}
4039 
4040 	if (!nft_use_inc(&chain->use)) {
4041 		err = -EMFILE;
4042 		goto err_release_rule;
4043 	}
4044 
4045 	if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
4046 		if (nft_chain_binding(chain)) {
4047 			err = -EOPNOTSUPP;
4048 			goto err_destroy_flow_rule;
4049 		}
4050 
4051 		err = nft_delrule(&ctx, old_rule);
4052 		if (err < 0)
4053 			goto err_destroy_flow_rule;
4054 
4055 		trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4056 		if (trans == NULL) {
4057 			err = -ENOMEM;
4058 			goto err_destroy_flow_rule;
4059 		}
4060 		list_add_tail_rcu(&rule->list, &old_rule->list);
4061 	} else {
4062 		trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4063 		if (!trans) {
4064 			err = -ENOMEM;
4065 			goto err_destroy_flow_rule;
4066 		}
4067 
4068 		if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
4069 			if (old_rule)
4070 				list_add_rcu(&rule->list, &old_rule->list);
4071 			else
4072 				list_add_tail_rcu(&rule->list, &chain->rules);
4073 		 } else {
4074 			if (old_rule)
4075 				list_add_tail_rcu(&rule->list, &old_rule->list);
4076 			else
4077 				list_add_rcu(&rule->list, &chain->rules);
4078 		}
4079 	}
4080 	kvfree(expr_info);
4081 
4082 	if (flow)
4083 		nft_trans_flow_rule(trans) = flow;
4084 
4085 	if (table->validate_state == NFT_VALIDATE_DO)
4086 		return nft_table_validate(net, table);
4087 
4088 	return 0;
4089 
4090 err_destroy_flow_rule:
4091 	nft_use_dec_restore(&chain->use);
4092 	if (flow)
4093 		nft_flow_rule_destroy(flow);
4094 err_release_rule:
4095 	nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
4096 	nf_tables_rule_destroy(&ctx, rule);
4097 err_release_expr:
4098 	for (i = 0; i < n; i++) {
4099 		if (expr_info[i].ops) {
4100 			module_put(expr_info[i].ops->type->owner);
4101 			if (expr_info[i].ops->type->release_ops)
4102 				expr_info[i].ops->type->release_ops(expr_info[i].ops);
4103 		}
4104 	}
4105 	kvfree(expr_info);
4106 
4107 	return err;
4108 }
4109 
nft_rule_lookup_byid(const struct net * net,const struct nft_chain * chain,const struct nlattr * nla)4110 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4111 					     const struct nft_chain *chain,
4112 					     const struct nlattr *nla)
4113 {
4114 	struct nftables_pernet *nft_net = nft_pernet(net);
4115 	u32 id = ntohl(nla_get_be32(nla));
4116 	struct nft_trans *trans;
4117 
4118 	list_for_each_entry(trans, &nft_net->commit_list, list) {
4119 		if (trans->msg_type == NFT_MSG_NEWRULE &&
4120 		    trans->ctx.chain == chain &&
4121 		    id == nft_trans_rule_id(trans))
4122 			return nft_trans_rule(trans);
4123 	}
4124 	return ERR_PTR(-ENOENT);
4125 }
4126 
nf_tables_delrule(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])4127 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4128 			     const struct nlattr * const nla[])
4129 {
4130 	struct netlink_ext_ack *extack = info->extack;
4131 	u8 genmask = nft_genmask_next(info->net);
4132 	u8 family = info->nfmsg->nfgen_family;
4133 	struct nft_chain *chain = NULL;
4134 	struct net *net = info->net;
4135 	struct nft_table *table;
4136 	struct nft_rule *rule;
4137 	struct nft_ctx ctx;
4138 	int err = 0;
4139 
4140 	table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4141 				 NETLINK_CB(skb).portid);
4142 	if (IS_ERR(table)) {
4143 		NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4144 		return PTR_ERR(table);
4145 	}
4146 
4147 	if (nla[NFTA_RULE_CHAIN]) {
4148 		chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4149 					 genmask);
4150 		if (IS_ERR(chain)) {
4151 			if (PTR_ERR(chain) == -ENOENT &&
4152 			    NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4153 				return 0;
4154 
4155 			NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4156 			return PTR_ERR(chain);
4157 		}
4158 		if (nft_chain_binding(chain))
4159 			return -EOPNOTSUPP;
4160 	}
4161 
4162 	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4163 
4164 	if (chain) {
4165 		if (nla[NFTA_RULE_HANDLE]) {
4166 			rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4167 			if (IS_ERR(rule)) {
4168 				if (PTR_ERR(rule) == -ENOENT &&
4169 				    NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4170 					return 0;
4171 
4172 				NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4173 				return PTR_ERR(rule);
4174 			}
4175 
4176 			err = nft_delrule(&ctx, rule);
4177 		} else if (nla[NFTA_RULE_ID]) {
4178 			rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4179 			if (IS_ERR(rule)) {
4180 				NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4181 				return PTR_ERR(rule);
4182 			}
4183 
4184 			err = nft_delrule(&ctx, rule);
4185 		} else {
4186 			err = nft_delrule_by_chain(&ctx);
4187 		}
4188 	} else {
4189 		list_for_each_entry(chain, &table->chains, list) {
4190 			if (!nft_is_active_next(net, chain))
4191 				continue;
4192 			if (nft_chain_binding(chain))
4193 				continue;
4194 
4195 			ctx.chain = chain;
4196 			err = nft_delrule_by_chain(&ctx);
4197 			if (err < 0)
4198 				break;
4199 		}
4200 	}
4201 
4202 	return err;
4203 }
4204 
4205 /*
4206  * Sets
4207  */
4208 static const struct nft_set_type *nft_set_types[] = {
4209 	&nft_set_hash_fast_type,
4210 	&nft_set_hash_type,
4211 	&nft_set_rhash_type,
4212 	&nft_set_bitmap_type,
4213 	&nft_set_rbtree_type,
4214 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4215 	&nft_set_pipapo_avx2_type,
4216 #endif
4217 	&nft_set_pipapo_type,
4218 };
4219 
4220 #define NFT_SET_FEATURES	(NFT_SET_INTERVAL | NFT_SET_MAP | \
4221 				 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4222 				 NFT_SET_EVAL)
4223 
nft_set_ops_candidate(const struct nft_set_type * type,u32 flags)4224 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4225 {
4226 	return (flags & type->features) == (flags & NFT_SET_FEATURES);
4227 }
4228 
4229 /*
4230  * Select a set implementation based on the data characteristics and the
4231  * given policy. The total memory use might not be known if no size is
4232  * given, in that case the amount of memory per element is used.
4233  */
4234 static const struct nft_set_ops *
nft_select_set_ops(const struct nft_ctx * ctx,const struct nlattr * const nla[],const struct nft_set_desc * desc)4235 nft_select_set_ops(const struct nft_ctx *ctx,
4236 		   const struct nlattr * const nla[],
4237 		   const struct nft_set_desc *desc)
4238 {
4239 	struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4240 	const struct nft_set_ops *ops, *bops;
4241 	struct nft_set_estimate est, best;
4242 	const struct nft_set_type *type;
4243 	u32 flags = 0;
4244 	int i;
4245 
4246 	lockdep_assert_held(&nft_net->commit_mutex);
4247 	lockdep_nfnl_nft_mutex_not_held();
4248 
4249 	if (nla[NFTA_SET_FLAGS] != NULL)
4250 		flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4251 
4252 	bops	    = NULL;
4253 	best.size   = ~0;
4254 	best.lookup = ~0;
4255 	best.space  = ~0;
4256 
4257 	for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4258 		type = nft_set_types[i];
4259 		ops = &type->ops;
4260 
4261 		if (!nft_set_ops_candidate(type, flags))
4262 			continue;
4263 		if (!ops->estimate(desc, flags, &est))
4264 			continue;
4265 
4266 		switch (desc->policy) {
4267 		case NFT_SET_POL_PERFORMANCE:
4268 			if (est.lookup < best.lookup)
4269 				break;
4270 			if (est.lookup == best.lookup &&
4271 			    est.space < best.space)
4272 				break;
4273 			continue;
4274 		case NFT_SET_POL_MEMORY:
4275 			if (!desc->size) {
4276 				if (est.space < best.space)
4277 					break;
4278 				if (est.space == best.space &&
4279 				    est.lookup < best.lookup)
4280 					break;
4281 			} else if (est.size < best.size || !bops) {
4282 				break;
4283 			}
4284 			continue;
4285 		default:
4286 			break;
4287 		}
4288 
4289 		bops = ops;
4290 		best = est;
4291 	}
4292 
4293 	if (bops != NULL)
4294 		return bops;
4295 
4296 	return ERR_PTR(-EOPNOTSUPP);
4297 }
4298 
4299 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4300 	[NFTA_SET_TABLE]		= { .type = NLA_STRING,
4301 					    .len = NFT_TABLE_MAXNAMELEN - 1 },
4302 	[NFTA_SET_NAME]			= { .type = NLA_STRING,
4303 					    .len = NFT_SET_MAXNAMELEN - 1 },
4304 	[NFTA_SET_FLAGS]		= { .type = NLA_U32 },
4305 	[NFTA_SET_KEY_TYPE]		= { .type = NLA_U32 },
4306 	[NFTA_SET_KEY_LEN]		= { .type = NLA_U32 },
4307 	[NFTA_SET_DATA_TYPE]		= { .type = NLA_U32 },
4308 	[NFTA_SET_DATA_LEN]		= { .type = NLA_U32 },
4309 	[NFTA_SET_POLICY]		= { .type = NLA_U32 },
4310 	[NFTA_SET_DESC]			= { .type = NLA_NESTED },
4311 	[NFTA_SET_ID]			= { .type = NLA_U32 },
4312 	[NFTA_SET_TIMEOUT]		= { .type = NLA_U64 },
4313 	[NFTA_SET_GC_INTERVAL]		= { .type = NLA_U32 },
4314 	[NFTA_SET_USERDATA]		= { .type = NLA_BINARY,
4315 					    .len  = NFT_USERDATA_MAXLEN },
4316 	[NFTA_SET_OBJ_TYPE]		= { .type = NLA_U32 },
4317 	[NFTA_SET_HANDLE]		= { .type = NLA_U64 },
4318 	[NFTA_SET_EXPR]			= { .type = NLA_NESTED },
4319 	[NFTA_SET_EXPRESSIONS]		= { .type = NLA_NESTED },
4320 };
4321 
4322 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4323 	[NFTA_SET_DESC_SIZE]		= { .type = NLA_U32 },
4324 	[NFTA_SET_DESC_CONCAT]		= { .type = NLA_NESTED },
4325 };
4326 
nft_set_lookup(const struct nft_table * table,const struct nlattr * nla,u8 genmask)4327 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4328 				      const struct nlattr *nla, u8 genmask)
4329 {
4330 	struct nft_set *set;
4331 
4332 	if (nla == NULL)
4333 		return ERR_PTR(-EINVAL);
4334 
4335 	list_for_each_entry_rcu(set, &table->sets, list) {
4336 		if (!nla_strcmp(nla, set->name) &&
4337 		    nft_active_genmask(set, genmask))
4338 			return set;
4339 	}
4340 	return ERR_PTR(-ENOENT);
4341 }
4342 
nft_set_lookup_byhandle(const struct nft_table * table,const struct nlattr * nla,u8 genmask)4343 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4344 					       const struct nlattr *nla,
4345 					       u8 genmask)
4346 {
4347 	struct nft_set *set;
4348 
4349 	list_for_each_entry(set, &table->sets, list) {
4350 		if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4351 		    nft_active_genmask(set, genmask))
4352 			return set;
4353 	}
4354 	return ERR_PTR(-ENOENT);
4355 }
4356 
nft_set_lookup_byid(const struct net * net,const struct nft_table * table,const struct nlattr * nla,u8 genmask)4357 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4358 					   const struct nft_table *table,
4359 					   const struct nlattr *nla, u8 genmask)
4360 {
4361 	struct nftables_pernet *nft_net = nft_pernet(net);
4362 	u32 id = ntohl(nla_get_be32(nla));
4363 	struct nft_trans *trans;
4364 
4365 	list_for_each_entry(trans, &nft_net->commit_list, list) {
4366 		if (trans->msg_type == NFT_MSG_NEWSET) {
4367 			struct nft_set *set = nft_trans_set(trans);
4368 
4369 			if (id == nft_trans_set_id(trans) &&
4370 			    set->table == table &&
4371 			    nft_active_genmask(set, genmask))
4372 				return set;
4373 		}
4374 	}
4375 	return ERR_PTR(-ENOENT);
4376 }
4377 
nft_set_lookup_global(const struct net * net,const struct nft_table * table,const struct nlattr * nla_set_name,const struct nlattr * nla_set_id,u8 genmask)4378 struct nft_set *nft_set_lookup_global(const struct net *net,
4379 				      const struct nft_table *table,
4380 				      const struct nlattr *nla_set_name,
4381 				      const struct nlattr *nla_set_id,
4382 				      u8 genmask)
4383 {
4384 	struct nft_set *set;
4385 
4386 	set = nft_set_lookup(table, nla_set_name, genmask);
4387 	if (IS_ERR(set)) {
4388 		if (!nla_set_id)
4389 			return set;
4390 
4391 		set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4392 	}
4393 	return set;
4394 }
4395 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4396 
nf_tables_set_alloc_name(struct nft_ctx * ctx,struct nft_set * set,const char * name)4397 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4398 				    const char *name)
4399 {
4400 	const struct nft_set *i;
4401 	const char *p;
4402 	unsigned long *inuse;
4403 	unsigned int n = 0, min = 0;
4404 
4405 	p = strchr(name, '%');
4406 	if (p != NULL) {
4407 		if (p[1] != 'd' || strchr(p + 2, '%'))
4408 			return -EINVAL;
4409 
4410 		if (strnlen(name, NFT_SET_MAX_ANONLEN) >= NFT_SET_MAX_ANONLEN)
4411 			return -EINVAL;
4412 
4413 		inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4414 		if (inuse == NULL)
4415 			return -ENOMEM;
4416 cont:
4417 		list_for_each_entry(i, &ctx->table->sets, list) {
4418 			int tmp;
4419 
4420 			if (!nft_is_active_next(ctx->net, i))
4421 				continue;
4422 			if (!sscanf(i->name, name, &tmp))
4423 				continue;
4424 			if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4425 				continue;
4426 
4427 			set_bit(tmp - min, inuse);
4428 		}
4429 
4430 		n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4431 		if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4432 			min += BITS_PER_BYTE * PAGE_SIZE;
4433 			memset(inuse, 0, PAGE_SIZE);
4434 			goto cont;
4435 		}
4436 		free_page((unsigned long)inuse);
4437 	}
4438 
4439 	set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4440 	if (!set->name)
4441 		return -ENOMEM;
4442 
4443 	list_for_each_entry(i, &ctx->table->sets, list) {
4444 		if (!nft_is_active_next(ctx->net, i))
4445 			continue;
4446 		if (!strcmp(set->name, i->name)) {
4447 			kfree(set->name);
4448 			set->name = NULL;
4449 			return -ENFILE;
4450 		}
4451 	}
4452 	return 0;
4453 }
4454 
nf_msecs_to_jiffies64(const struct nlattr * nla,u64 * result)4455 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4456 {
4457 	u64 ms = be64_to_cpu(nla_get_be64(nla));
4458 	u64 max = (u64)(~((u64)0));
4459 
4460 	max = div_u64(max, NSEC_PER_MSEC);
4461 	if (ms >= max)
4462 		return -ERANGE;
4463 
4464 	ms *= NSEC_PER_MSEC;
4465 	*result = nsecs_to_jiffies64(ms);
4466 	return 0;
4467 }
4468 
nf_jiffies64_to_msecs(u64 input)4469 __be64 nf_jiffies64_to_msecs(u64 input)
4470 {
4471 	return cpu_to_be64(jiffies64_to_msecs(input));
4472 }
4473 
nf_tables_fill_set_concat(struct sk_buff * skb,const struct nft_set * set)4474 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4475 				     const struct nft_set *set)
4476 {
4477 	struct nlattr *concat, *field;
4478 	int i;
4479 
4480 	concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4481 	if (!concat)
4482 		return -ENOMEM;
4483 
4484 	for (i = 0; i < set->field_count; i++) {
4485 		field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4486 		if (!field)
4487 			return -ENOMEM;
4488 
4489 		if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4490 				 htonl(set->field_len[i])))
4491 			return -ENOMEM;
4492 
4493 		nla_nest_end(skb, field);
4494 	}
4495 
4496 	nla_nest_end(skb, concat);
4497 
4498 	return 0;
4499 }
4500 
nf_tables_fill_set(struct sk_buff * skb,const struct nft_ctx * ctx,const struct nft_set * set,u16 event,u16 flags)4501 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4502 			      const struct nft_set *set, u16 event, u16 flags)
4503 {
4504 	u64 timeout = READ_ONCE(set->timeout);
4505 	u32 gc_int = READ_ONCE(set->gc_int);
4506 	u32 portid = ctx->portid;
4507 	struct nlmsghdr *nlh;
4508 	struct nlattr *nest;
4509 	u32 seq = ctx->seq;
4510 	int i;
4511 
4512 	event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4513 	nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4514 			   NFNETLINK_V0, nft_base_seq(ctx->net));
4515 	if (!nlh)
4516 		goto nla_put_failure;
4517 
4518 	if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4519 		goto nla_put_failure;
4520 	if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4521 		goto nla_put_failure;
4522 	if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4523 			 NFTA_SET_PAD))
4524 		goto nla_put_failure;
4525 
4526 	if (event == NFT_MSG_DELSET) {
4527 		nlmsg_end(skb, nlh);
4528 		return 0;
4529 	}
4530 
4531 	if (set->flags != 0)
4532 		if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4533 			goto nla_put_failure;
4534 
4535 	if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4536 		goto nla_put_failure;
4537 	if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4538 		goto nla_put_failure;
4539 	if (set->flags & NFT_SET_MAP) {
4540 		if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4541 			goto nla_put_failure;
4542 		if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4543 			goto nla_put_failure;
4544 	}
4545 	if (set->flags & NFT_SET_OBJECT &&
4546 	    nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4547 		goto nla_put_failure;
4548 
4549 	if (timeout &&
4550 	    nla_put_be64(skb, NFTA_SET_TIMEOUT,
4551 			 nf_jiffies64_to_msecs(timeout),
4552 			 NFTA_SET_PAD))
4553 		goto nla_put_failure;
4554 	if (gc_int &&
4555 	    nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4556 		goto nla_put_failure;
4557 
4558 	if (set->policy != NFT_SET_POL_PERFORMANCE) {
4559 		if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4560 			goto nla_put_failure;
4561 	}
4562 
4563 	if (set->udata &&
4564 	    nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4565 		goto nla_put_failure;
4566 
4567 	nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4568 	if (!nest)
4569 		goto nla_put_failure;
4570 	if (set->size &&
4571 	    nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4572 		goto nla_put_failure;
4573 
4574 	if (set->field_count > 1 &&
4575 	    nf_tables_fill_set_concat(skb, set))
4576 		goto nla_put_failure;
4577 
4578 	nla_nest_end(skb, nest);
4579 
4580 	if (set->num_exprs == 1) {
4581 		nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4582 		if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4583 			goto nla_put_failure;
4584 
4585 		nla_nest_end(skb, nest);
4586 	} else if (set->num_exprs > 1) {
4587 		nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4588 		if (nest == NULL)
4589 			goto nla_put_failure;
4590 
4591 		for (i = 0; i < set->num_exprs; i++) {
4592 			if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4593 					  set->exprs[i], false) < 0)
4594 				goto nla_put_failure;
4595 		}
4596 		nla_nest_end(skb, nest);
4597 	}
4598 
4599 	nlmsg_end(skb, nlh);
4600 	return 0;
4601 
4602 nla_put_failure:
4603 	nlmsg_trim(skb, nlh);
4604 	return -1;
4605 }
4606 
nf_tables_set_notify(const struct nft_ctx * ctx,const struct nft_set * set,int event,gfp_t gfp_flags)4607 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4608 				 const struct nft_set *set, int event,
4609 			         gfp_t gfp_flags)
4610 {
4611 	struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4612 	u32 portid = ctx->portid;
4613 	struct sk_buff *skb;
4614 	u16 flags = 0;
4615 	int err;
4616 
4617 	if (!ctx->report &&
4618 	    !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4619 		return;
4620 
4621 	skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4622 	if (skb == NULL)
4623 		goto err;
4624 
4625 	if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4626 		flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4627 
4628 	err = nf_tables_fill_set(skb, ctx, set, event, flags);
4629 	if (err < 0) {
4630 		kfree_skb(skb);
4631 		goto err;
4632 	}
4633 
4634 	nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4635 	return;
4636 err:
4637 	nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4638 }
4639 
nf_tables_dump_sets(struct sk_buff * skb,struct netlink_callback * cb)4640 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4641 {
4642 	const struct nft_set *set;
4643 	unsigned int idx, s_idx = cb->args[0];
4644 	struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4645 	struct net *net = sock_net(skb->sk);
4646 	struct nft_ctx *ctx = cb->data, ctx_set;
4647 	struct nftables_pernet *nft_net;
4648 
4649 	if (cb->args[1])
4650 		return skb->len;
4651 
4652 	rcu_read_lock();
4653 	nft_net = nft_pernet(net);
4654 	cb->seq = READ_ONCE(nft_net->base_seq);
4655 
4656 	list_for_each_entry_rcu(table, &nft_net->tables, list) {
4657 		if (ctx->family != NFPROTO_UNSPEC &&
4658 		    ctx->family != table->family)
4659 			continue;
4660 
4661 		if (ctx->table && ctx->table != table)
4662 			continue;
4663 
4664 		if (cur_table) {
4665 			if (cur_table != table)
4666 				continue;
4667 
4668 			cur_table = NULL;
4669 		}
4670 		idx = 0;
4671 		list_for_each_entry_rcu(set, &table->sets, list) {
4672 			if (idx < s_idx)
4673 				goto cont;
4674 			if (!nft_is_active(net, set))
4675 				goto cont;
4676 
4677 			ctx_set = *ctx;
4678 			ctx_set.table = table;
4679 			ctx_set.family = table->family;
4680 
4681 			if (nf_tables_fill_set(skb, &ctx_set, set,
4682 					       NFT_MSG_NEWSET,
4683 					       NLM_F_MULTI) < 0) {
4684 				cb->args[0] = idx;
4685 				cb->args[2] = (unsigned long) table;
4686 				goto done;
4687 			}
4688 			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4689 cont:
4690 			idx++;
4691 		}
4692 		if (s_idx)
4693 			s_idx = 0;
4694 	}
4695 	cb->args[1] = 1;
4696 done:
4697 	rcu_read_unlock();
4698 	return skb->len;
4699 }
4700 
nf_tables_dump_sets_start(struct netlink_callback * cb)4701 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4702 {
4703 	struct nft_ctx *ctx_dump = NULL;
4704 
4705 	ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4706 	if (ctx_dump == NULL)
4707 		return -ENOMEM;
4708 
4709 	cb->data = ctx_dump;
4710 	return 0;
4711 }
4712 
nf_tables_dump_sets_done(struct netlink_callback * cb)4713 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4714 {
4715 	kfree(cb->data);
4716 	return 0;
4717 }
4718 
4719 /* called with rcu_read_lock held */
nf_tables_getset(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])4720 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4721 			    const struct nlattr * const nla[])
4722 {
4723 	struct netlink_ext_ack *extack = info->extack;
4724 	u8 genmask = nft_genmask_cur(info->net);
4725 	u8 family = info->nfmsg->nfgen_family;
4726 	struct nft_table *table = NULL;
4727 	struct net *net = info->net;
4728 	const struct nft_set *set;
4729 	struct sk_buff *skb2;
4730 	struct nft_ctx ctx;
4731 	int err;
4732 
4733 	if (nla[NFTA_SET_TABLE]) {
4734 		table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4735 					 genmask, 0);
4736 		if (IS_ERR(table)) {
4737 			NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4738 			return PTR_ERR(table);
4739 		}
4740 	}
4741 
4742 	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4743 
4744 	if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4745 		struct netlink_dump_control c = {
4746 			.start = nf_tables_dump_sets_start,
4747 			.dump = nf_tables_dump_sets,
4748 			.done = nf_tables_dump_sets_done,
4749 			.data = &ctx,
4750 			.module = THIS_MODULE,
4751 		};
4752 
4753 		return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4754 	}
4755 
4756 	/* Only accept unspec with dump */
4757 	if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4758 		return -EAFNOSUPPORT;
4759 	if (!nla[NFTA_SET_TABLE])
4760 		return -EINVAL;
4761 
4762 	set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4763 	if (IS_ERR(set))
4764 		return PTR_ERR(set);
4765 
4766 	skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4767 	if (skb2 == NULL)
4768 		return -ENOMEM;
4769 
4770 	err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4771 	if (err < 0)
4772 		goto err_fill_set_info;
4773 
4774 	return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4775 
4776 err_fill_set_info:
4777 	kfree_skb(skb2);
4778 	return err;
4779 }
4780 
4781 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4782 	[NFTA_SET_FIELD_LEN]	= { .type = NLA_U32 },
4783 };
4784 
nft_set_desc_concat_parse(const struct nlattr * attr,struct nft_set_desc * desc)4785 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4786 				     struct nft_set_desc *desc)
4787 {
4788 	struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4789 	u32 len;
4790 	int err;
4791 
4792 	if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4793 		return -E2BIG;
4794 
4795 	err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4796 					  nft_concat_policy, NULL);
4797 	if (err < 0)
4798 		return err;
4799 
4800 	if (!tb[NFTA_SET_FIELD_LEN])
4801 		return -EINVAL;
4802 
4803 	len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4804 	if (!len || len > U8_MAX)
4805 		return -EINVAL;
4806 
4807 	desc->field_len[desc->field_count++] = len;
4808 
4809 	return 0;
4810 }
4811 
nft_set_desc_concat(struct nft_set_desc * desc,const struct nlattr * nla)4812 static int nft_set_desc_concat(struct nft_set_desc *desc,
4813 			       const struct nlattr *nla)
4814 {
4815 	u32 num_regs = 0, key_num_regs = 0;
4816 	struct nlattr *attr;
4817 	int rem, err, i;
4818 
4819 	nla_for_each_nested(attr, nla, rem) {
4820 		if (nla_type(attr) != NFTA_LIST_ELEM)
4821 			return -EINVAL;
4822 
4823 		err = nft_set_desc_concat_parse(attr, desc);
4824 		if (err < 0)
4825 			return err;
4826 	}
4827 
4828 	for (i = 0; i < desc->field_count; i++)
4829 		num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4830 
4831 	key_num_regs = DIV_ROUND_UP(desc->klen, sizeof(u32));
4832 	if (key_num_regs != num_regs)
4833 		return -EINVAL;
4834 
4835 	if (num_regs > NFT_REG32_COUNT)
4836 		return -E2BIG;
4837 
4838 	return 0;
4839 }
4840 
nf_tables_set_desc_parse(struct nft_set_desc * desc,const struct nlattr * nla)4841 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4842 				    const struct nlattr *nla)
4843 {
4844 	struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4845 	int err;
4846 
4847 	err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4848 					  nft_set_desc_policy, NULL);
4849 	if (err < 0)
4850 		return err;
4851 
4852 	if (da[NFTA_SET_DESC_SIZE] != NULL)
4853 		desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4854 	if (da[NFTA_SET_DESC_CONCAT])
4855 		err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4856 
4857 	return err;
4858 }
4859 
nft_set_expr_alloc(struct nft_ctx * ctx,struct nft_set * set,const struct nlattr * const * nla,struct nft_expr ** exprs,int * num_exprs,u32 flags)4860 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4861 			      const struct nlattr * const *nla,
4862 			      struct nft_expr **exprs, int *num_exprs,
4863 			      u32 flags)
4864 {
4865 	struct nft_expr *expr;
4866 	int err, i;
4867 
4868 	if (nla[NFTA_SET_EXPR]) {
4869 		expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4870 		if (IS_ERR(expr)) {
4871 			err = PTR_ERR(expr);
4872 			goto err_set_expr_alloc;
4873 		}
4874 		exprs[0] = expr;
4875 		(*num_exprs)++;
4876 	} else if (nla[NFTA_SET_EXPRESSIONS]) {
4877 		struct nlattr *tmp;
4878 		int left;
4879 
4880 		if (!(flags & NFT_SET_EXPR)) {
4881 			err = -EINVAL;
4882 			goto err_set_expr_alloc;
4883 		}
4884 		i = 0;
4885 		nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4886 			if (i == NFT_SET_EXPR_MAX) {
4887 				err = -E2BIG;
4888 				goto err_set_expr_alloc;
4889 			}
4890 			if (nla_type(tmp) != NFTA_LIST_ELEM) {
4891 				err = -EINVAL;
4892 				goto err_set_expr_alloc;
4893 			}
4894 			expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4895 			if (IS_ERR(expr)) {
4896 				err = PTR_ERR(expr);
4897 				goto err_set_expr_alloc;
4898 			}
4899 			exprs[i++] = expr;
4900 			(*num_exprs)++;
4901 		}
4902 	}
4903 
4904 	return 0;
4905 
4906 err_set_expr_alloc:
4907 	for (i = 0; i < *num_exprs; i++)
4908 		nft_expr_destroy(ctx, exprs[i]);
4909 
4910 	return err;
4911 }
4912 
nft_set_is_same(const struct nft_set * set,const struct nft_set_desc * desc,struct nft_expr * exprs[],u32 num_exprs,u32 flags)4913 static bool nft_set_is_same(const struct nft_set *set,
4914 			    const struct nft_set_desc *desc,
4915 			    struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4916 {
4917 	int i;
4918 
4919 	if (set->ktype != desc->ktype ||
4920 	    set->dtype != desc->dtype ||
4921 	    set->flags != flags ||
4922 	    set->klen != desc->klen ||
4923 	    set->dlen != desc->dlen ||
4924 	    set->field_count != desc->field_count ||
4925 	    set->num_exprs != num_exprs)
4926 		return false;
4927 
4928 	for (i = 0; i < desc->field_count; i++) {
4929 		if (set->field_len[i] != desc->field_len[i])
4930 			return false;
4931 	}
4932 
4933 	for (i = 0; i < num_exprs; i++) {
4934 		if (set->exprs[i]->ops != exprs[i]->ops)
4935 			return false;
4936 	}
4937 
4938 	return true;
4939 }
4940 
nf_tables_newset(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])4941 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4942 			    const struct nlattr * const nla[])
4943 {
4944 	struct netlink_ext_ack *extack = info->extack;
4945 	u8 genmask = nft_genmask_next(info->net);
4946 	u8 family = info->nfmsg->nfgen_family;
4947 	const struct nft_set_ops *ops;
4948 	struct net *net = info->net;
4949 	struct nft_set_desc desc;
4950 	struct nft_table *table;
4951 	unsigned char *udata;
4952 	struct nft_set *set;
4953 	struct nft_ctx ctx;
4954 	size_t alloc_size;
4955 	int num_exprs = 0;
4956 	char *name;
4957 	int err, i;
4958 	u16 udlen;
4959 	u32 flags;
4960 	u64 size;
4961 
4962 	if (nla[NFTA_SET_TABLE] == NULL ||
4963 	    nla[NFTA_SET_NAME] == NULL ||
4964 	    nla[NFTA_SET_KEY_LEN] == NULL ||
4965 	    nla[NFTA_SET_ID] == NULL)
4966 		return -EINVAL;
4967 
4968 	memset(&desc, 0, sizeof(desc));
4969 
4970 	desc.ktype = NFT_DATA_VALUE;
4971 	if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4972 		desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4973 		if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4974 			return -EINVAL;
4975 	}
4976 
4977 	desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4978 	if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4979 		return -EINVAL;
4980 
4981 	flags = 0;
4982 	if (nla[NFTA_SET_FLAGS] != NULL) {
4983 		flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4984 		if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4985 			      NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4986 			      NFT_SET_MAP | NFT_SET_EVAL |
4987 			      NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4988 			return -EOPNOTSUPP;
4989 		/* Only one of these operations is supported */
4990 		if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4991 			     (NFT_SET_MAP | NFT_SET_OBJECT))
4992 			return -EOPNOTSUPP;
4993 		if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4994 			     (NFT_SET_EVAL | NFT_SET_OBJECT))
4995 			return -EOPNOTSUPP;
4996 		if ((flags & (NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT | NFT_SET_EVAL)) ==
4997 			     (NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT))
4998 			return -EOPNOTSUPP;
4999 		if ((flags & (NFT_SET_CONSTANT | NFT_SET_TIMEOUT)) ==
5000 			     (NFT_SET_CONSTANT | NFT_SET_TIMEOUT))
5001 			return -EOPNOTSUPP;
5002 	}
5003 
5004 	desc.dtype = 0;
5005 	if (nla[NFTA_SET_DATA_TYPE] != NULL) {
5006 		if (!(flags & NFT_SET_MAP))
5007 			return -EINVAL;
5008 
5009 		desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
5010 		if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
5011 		    desc.dtype != NFT_DATA_VERDICT)
5012 			return -EINVAL;
5013 
5014 		if (desc.dtype != NFT_DATA_VERDICT) {
5015 			if (nla[NFTA_SET_DATA_LEN] == NULL)
5016 				return -EINVAL;
5017 			desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
5018 			if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
5019 				return -EINVAL;
5020 		} else
5021 			desc.dlen = sizeof(struct nft_verdict);
5022 	} else if (flags & NFT_SET_MAP)
5023 		return -EINVAL;
5024 
5025 	if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
5026 		if (!(flags & NFT_SET_OBJECT))
5027 			return -EINVAL;
5028 
5029 		desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
5030 		if (desc.objtype == NFT_OBJECT_UNSPEC ||
5031 		    desc.objtype > NFT_OBJECT_MAX)
5032 			return -EOPNOTSUPP;
5033 	} else if (flags & NFT_SET_OBJECT)
5034 		return -EINVAL;
5035 	else
5036 		desc.objtype = NFT_OBJECT_UNSPEC;
5037 
5038 	desc.timeout = 0;
5039 	if (nla[NFTA_SET_TIMEOUT] != NULL) {
5040 		if (!(flags & NFT_SET_TIMEOUT))
5041 			return -EINVAL;
5042 
5043 		if (flags & NFT_SET_ANONYMOUS)
5044 			return -EOPNOTSUPP;
5045 
5046 		err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
5047 		if (err)
5048 			return err;
5049 	}
5050 	desc.gc_int = 0;
5051 	if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
5052 		if (!(flags & NFT_SET_TIMEOUT))
5053 			return -EINVAL;
5054 
5055 		if (flags & NFT_SET_ANONYMOUS)
5056 			return -EOPNOTSUPP;
5057 
5058 		desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
5059 	}
5060 
5061 	desc.policy = NFT_SET_POL_PERFORMANCE;
5062 	if (nla[NFTA_SET_POLICY] != NULL) {
5063 		desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
5064 		switch (desc.policy) {
5065 		case NFT_SET_POL_PERFORMANCE:
5066 		case NFT_SET_POL_MEMORY:
5067 			break;
5068 		default:
5069 			return -EOPNOTSUPP;
5070 		}
5071 	}
5072 
5073 	if (nla[NFTA_SET_DESC] != NULL) {
5074 		err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
5075 		if (err < 0)
5076 			return err;
5077 
5078 		if (desc.field_count > 1) {
5079 			if (!(flags & NFT_SET_CONCAT))
5080 				return -EINVAL;
5081 		} else if (flags & NFT_SET_CONCAT) {
5082 			return -EINVAL;
5083 		}
5084 	} else if (flags & NFT_SET_CONCAT) {
5085 		return -EINVAL;
5086 	}
5087 
5088 	if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
5089 		desc.expr = true;
5090 
5091 	table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
5092 				 NETLINK_CB(skb).portid);
5093 	if (IS_ERR(table)) {
5094 		NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5095 		return PTR_ERR(table);
5096 	}
5097 
5098 	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5099 
5100 	set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
5101 	if (IS_ERR(set)) {
5102 		if (PTR_ERR(set) != -ENOENT) {
5103 			NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5104 			return PTR_ERR(set);
5105 		}
5106 	} else {
5107 		struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
5108 
5109 		if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
5110 			NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5111 			return -EEXIST;
5112 		}
5113 		if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
5114 			return -EOPNOTSUPP;
5115 
5116 		if (nft_set_is_anonymous(set))
5117 			return -EOPNOTSUPP;
5118 
5119 		err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
5120 		if (err < 0)
5121 			return err;
5122 
5123 		err = 0;
5124 		if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
5125 			NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5126 			err = -EEXIST;
5127 		}
5128 
5129 		for (i = 0; i < num_exprs; i++)
5130 			nft_expr_destroy(&ctx, exprs[i]);
5131 
5132 		if (err < 0)
5133 			return err;
5134 
5135 		return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5136 	}
5137 
5138 	if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5139 		return -ENOENT;
5140 
5141 	ops = nft_select_set_ops(&ctx, nla, &desc);
5142 	if (IS_ERR(ops))
5143 		return PTR_ERR(ops);
5144 
5145 	udlen = 0;
5146 	if (nla[NFTA_SET_USERDATA])
5147 		udlen = nla_len(nla[NFTA_SET_USERDATA]);
5148 
5149 	size = 0;
5150 	if (ops->privsize != NULL)
5151 		size = ops->privsize(nla, &desc);
5152 	alloc_size = sizeof(*set) + size + udlen;
5153 	if (alloc_size < size || alloc_size > INT_MAX)
5154 		return -ENOMEM;
5155 
5156 	if (!nft_use_inc(&table->use))
5157 		return -EMFILE;
5158 
5159 	set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5160 	if (!set) {
5161 		err = -ENOMEM;
5162 		goto err_alloc;
5163 	}
5164 
5165 	name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5166 	if (!name) {
5167 		err = -ENOMEM;
5168 		goto err_set_name;
5169 	}
5170 
5171 	err = nf_tables_set_alloc_name(&ctx, set, name);
5172 	kfree(name);
5173 	if (err < 0)
5174 		goto err_set_name;
5175 
5176 	udata = NULL;
5177 	if (udlen) {
5178 		udata = set->data + size;
5179 		nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5180 	}
5181 
5182 	INIT_LIST_HEAD(&set->bindings);
5183 	INIT_LIST_HEAD(&set->catchall_list);
5184 	refcount_set(&set->refs, 1);
5185 	set->table = table;
5186 	write_pnet(&set->net, net);
5187 	set->ops = ops;
5188 	set->ktype = desc.ktype;
5189 	set->klen = desc.klen;
5190 	set->dtype = desc.dtype;
5191 	set->objtype = desc.objtype;
5192 	set->dlen = desc.dlen;
5193 	set->flags = flags;
5194 	set->size = desc.size;
5195 	set->policy = desc.policy;
5196 	set->udlen = udlen;
5197 	set->udata = udata;
5198 	set->timeout = desc.timeout;
5199 	set->gc_int = desc.gc_int;
5200 
5201 	set->field_count = desc.field_count;
5202 	for (i = 0; i < desc.field_count; i++)
5203 		set->field_len[i] = desc.field_len[i];
5204 
5205 	err = ops->init(set, &desc, nla);
5206 	if (err < 0)
5207 		goto err_set_init;
5208 
5209 	err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5210 	if (err < 0)
5211 		goto err_set_destroy;
5212 
5213 	set->num_exprs = num_exprs;
5214 	set->handle = nf_tables_alloc_handle(table);
5215 	INIT_LIST_HEAD(&set->pending_update);
5216 
5217 	err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5218 	if (err < 0)
5219 		goto err_set_expr_alloc;
5220 
5221 	list_add_tail_rcu(&set->list, &table->sets);
5222 
5223 	return 0;
5224 
5225 err_set_expr_alloc:
5226 	for (i = 0; i < set->num_exprs; i++)
5227 		nft_expr_destroy(&ctx, set->exprs[i]);
5228 err_set_destroy:
5229 	ops->destroy(&ctx, set);
5230 err_set_init:
5231 	kfree(set->name);
5232 err_set_name:
5233 	kvfree(set);
5234 err_alloc:
5235 	nft_use_dec_restore(&table->use);
5236 
5237 	return err;
5238 }
5239 
nft_set_catchall_destroy(const struct nft_ctx * ctx,struct nft_set * set)5240 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5241 				     struct nft_set *set)
5242 {
5243 	struct nft_set_elem_catchall *next, *catchall;
5244 
5245 	list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5246 		list_del_rcu(&catchall->list);
5247 		nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5248 		kfree_rcu(catchall, rcu);
5249 	}
5250 }
5251 
nft_set_put(struct nft_set * set)5252 static void nft_set_put(struct nft_set *set)
5253 {
5254 	if (refcount_dec_and_test(&set->refs)) {
5255 		kfree(set->name);
5256 		kvfree(set);
5257 	}
5258 }
5259 
nft_set_destroy(const struct nft_ctx * ctx,struct nft_set * set)5260 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5261 {
5262 	int i;
5263 
5264 	if (WARN_ON(set->use > 0))
5265 		return;
5266 
5267 	for (i = 0; i < set->num_exprs; i++)
5268 		nft_expr_destroy(ctx, set->exprs[i]);
5269 
5270 	set->ops->destroy(ctx, set);
5271 	nft_set_catchall_destroy(ctx, set);
5272 	nft_set_put(set);
5273 }
5274 
nf_tables_delset(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])5275 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5276 			    const struct nlattr * const nla[])
5277 {
5278 	struct netlink_ext_ack *extack = info->extack;
5279 	u8 genmask = nft_genmask_next(info->net);
5280 	u8 family = info->nfmsg->nfgen_family;
5281 	struct net *net = info->net;
5282 	const struct nlattr *attr;
5283 	struct nft_table *table;
5284 	struct nft_set *set;
5285 	struct nft_ctx ctx;
5286 
5287 	if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5288 		return -EAFNOSUPPORT;
5289 
5290 	table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5291 				 genmask, NETLINK_CB(skb).portid);
5292 	if (IS_ERR(table)) {
5293 		NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5294 		return PTR_ERR(table);
5295 	}
5296 
5297 	if (nla[NFTA_SET_HANDLE]) {
5298 		attr = nla[NFTA_SET_HANDLE];
5299 		set = nft_set_lookup_byhandle(table, attr, genmask);
5300 	} else {
5301 		attr = nla[NFTA_SET_NAME];
5302 		set = nft_set_lookup(table, attr, genmask);
5303 	}
5304 
5305 	if (IS_ERR(set)) {
5306 		if (PTR_ERR(set) == -ENOENT &&
5307 		    NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5308 			return 0;
5309 
5310 		NL_SET_BAD_ATTR(extack, attr);
5311 		return PTR_ERR(set);
5312 	}
5313 	if (set->use ||
5314 	    (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5315 	     atomic_read(&set->nelems) > 0)) {
5316 		NL_SET_BAD_ATTR(extack, attr);
5317 		return -EBUSY;
5318 	}
5319 
5320 	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5321 
5322 	return nft_delset(&ctx, set);
5323 }
5324 
5325 static int nft_validate_register_store(const struct nft_ctx *ctx,
5326 				       enum nft_registers reg,
5327 				       const struct nft_data *data,
5328 				       enum nft_data_types type,
5329 				       unsigned int len);
5330 
nft_setelem_data_validate(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_elem * elem)5331 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5332 				     struct nft_set *set,
5333 				     struct nft_set_elem *elem)
5334 {
5335 	const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5336 	enum nft_registers dreg;
5337 
5338 	dreg = nft_type_to_reg(set->dtype);
5339 	return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5340 					   set->dtype == NFT_DATA_VERDICT ?
5341 					   NFT_DATA_VERDICT : NFT_DATA_VALUE,
5342 					   set->dlen);
5343 }
5344 
nf_tables_bind_check_setelem(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)5345 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5346 					struct nft_set *set,
5347 					const struct nft_set_iter *iter,
5348 					struct nft_set_elem *elem)
5349 {
5350 	return nft_setelem_data_validate(ctx, set, elem);
5351 }
5352 
nft_set_catchall_bind_check(const struct nft_ctx * ctx,struct nft_set * set)5353 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5354 				       struct nft_set *set)
5355 {
5356 	u8 genmask = nft_genmask_next(ctx->net);
5357 	struct nft_set_elem_catchall *catchall;
5358 	struct nft_set_elem elem;
5359 	struct nft_set_ext *ext;
5360 	int ret = 0;
5361 
5362 	list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5363 		ext = nft_set_elem_ext(set, catchall->elem);
5364 		if (!nft_set_elem_active(ext, genmask))
5365 			continue;
5366 
5367 		elem.priv = catchall->elem;
5368 		ret = nft_setelem_data_validate(ctx, set, &elem);
5369 		if (ret < 0)
5370 			break;
5371 	}
5372 
5373 	return ret;
5374 }
5375 
nf_tables_bind_set(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_binding * binding)5376 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5377 		       struct nft_set_binding *binding)
5378 {
5379 	struct nft_set_binding *i;
5380 	struct nft_set_iter iter;
5381 
5382 	if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5383 		return -EBUSY;
5384 
5385 	if (binding->flags & NFT_SET_MAP) {
5386 		/* If the set is already bound to the same chain all
5387 		 * jumps are already validated for that chain.
5388 		 */
5389 		list_for_each_entry(i, &set->bindings, list) {
5390 			if (i->flags & NFT_SET_MAP &&
5391 			    i->chain == binding->chain)
5392 				goto bind;
5393 		}
5394 
5395 		iter.genmask	= nft_genmask_next(ctx->net);
5396 		iter.type	= NFT_ITER_UPDATE;
5397 		iter.skip 	= 0;
5398 		iter.count	= 0;
5399 		iter.err	= 0;
5400 		iter.fn		= nf_tables_bind_check_setelem;
5401 
5402 		set->ops->walk(ctx, set, &iter);
5403 		if (!iter.err)
5404 			iter.err = nft_set_catchall_bind_check(ctx, set);
5405 
5406 		if (iter.err < 0)
5407 			return iter.err;
5408 	}
5409 bind:
5410 	if (!nft_use_inc(&set->use))
5411 		return -EMFILE;
5412 
5413 	binding->chain = ctx->chain;
5414 	list_add_tail_rcu(&binding->list, &set->bindings);
5415 	nft_set_trans_bind(ctx, set);
5416 
5417 	return 0;
5418 }
5419 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5420 
nf_tables_unbind_set(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_binding * binding,bool event)5421 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5422 				 struct nft_set_binding *binding, bool event)
5423 {
5424 	list_del_rcu(&binding->list);
5425 
5426 	if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5427 		list_del_rcu(&set->list);
5428 		set->dead = 1;
5429 		if (event)
5430 			nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5431 					     GFP_KERNEL);
5432 	}
5433 }
5434 
5435 static void nft_setelem_data_activate(const struct net *net,
5436 				      const struct nft_set *set,
5437 				      struct nft_set_elem *elem);
5438 
nft_mapelem_activate(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)5439 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5440 				struct nft_set *set,
5441 				const struct nft_set_iter *iter,
5442 				struct nft_set_elem *elem)
5443 {
5444 	nft_setelem_data_activate(ctx->net, set, elem);
5445 
5446 	return 0;
5447 }
5448 
nft_map_catchall_activate(const struct nft_ctx * ctx,struct nft_set * set)5449 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5450 				      struct nft_set *set)
5451 {
5452 	u8 genmask = nft_genmask_next(ctx->net);
5453 	struct nft_set_elem_catchall *catchall;
5454 	struct nft_set_elem elem;
5455 	struct nft_set_ext *ext;
5456 
5457 	list_for_each_entry(catchall, &set->catchall_list, list) {
5458 		ext = nft_set_elem_ext(set, catchall->elem);
5459 		if (!nft_set_elem_active(ext, genmask))
5460 			continue;
5461 
5462 		elem.priv = catchall->elem;
5463 		nft_setelem_data_activate(ctx->net, set, &elem);
5464 		break;
5465 	}
5466 }
5467 
nft_map_activate(const struct nft_ctx * ctx,struct nft_set * set)5468 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5469 {
5470 	struct nft_set_iter iter = {
5471 		.genmask	= nft_genmask_next(ctx->net),
5472 		.type		= NFT_ITER_UPDATE,
5473 		.fn		= nft_mapelem_activate,
5474 	};
5475 
5476 	set->ops->walk(ctx, set, &iter);
5477 	WARN_ON_ONCE(iter.err);
5478 
5479 	nft_map_catchall_activate(ctx, set);
5480 }
5481 
nf_tables_activate_set(const struct nft_ctx * ctx,struct nft_set * set)5482 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5483 {
5484 	if (nft_set_is_anonymous(set)) {
5485 		if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5486 			nft_map_activate(ctx, set);
5487 
5488 		nft_clear(ctx->net, set);
5489 	}
5490 
5491 	nft_use_inc_restore(&set->use);
5492 }
5493 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5494 
nf_tables_deactivate_set(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_binding * binding,enum nft_trans_phase phase)5495 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5496 			      struct nft_set_binding *binding,
5497 			      enum nft_trans_phase phase)
5498 {
5499 	switch (phase) {
5500 	case NFT_TRANS_PREPARE_ERROR:
5501 		nft_set_trans_unbind(ctx, set);
5502 		if (nft_set_is_anonymous(set))
5503 			nft_deactivate_next(ctx->net, set);
5504 		else
5505 			list_del_rcu(&binding->list);
5506 
5507 		nft_use_dec(&set->use);
5508 		break;
5509 	case NFT_TRANS_PREPARE:
5510 		if (nft_set_is_anonymous(set)) {
5511 			if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5512 				nft_map_deactivate(ctx, set);
5513 
5514 			nft_deactivate_next(ctx->net, set);
5515 		}
5516 		nft_use_dec(&set->use);
5517 		return;
5518 	case NFT_TRANS_ABORT:
5519 	case NFT_TRANS_RELEASE:
5520 		if (nft_set_is_anonymous(set) &&
5521 		    set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5522 			nft_map_deactivate(ctx, set);
5523 
5524 		nft_use_dec(&set->use);
5525 		fallthrough;
5526 	default:
5527 		nf_tables_unbind_set(ctx, set, binding,
5528 				     phase == NFT_TRANS_COMMIT);
5529 	}
5530 }
5531 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5532 
nf_tables_destroy_set(const struct nft_ctx * ctx,struct nft_set * set)5533 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5534 {
5535 	if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5536 		nft_set_destroy(ctx, set);
5537 }
5538 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5539 
5540 const struct nft_set_ext_type nft_set_ext_types[] = {
5541 	[NFT_SET_EXT_KEY]		= {
5542 		.align	= __alignof__(u32),
5543 	},
5544 	[NFT_SET_EXT_DATA]		= {
5545 		.align	= __alignof__(u32),
5546 	},
5547 	[NFT_SET_EXT_EXPRESSIONS]	= {
5548 		.align	= __alignof__(struct nft_set_elem_expr),
5549 	},
5550 	[NFT_SET_EXT_OBJREF]		= {
5551 		.len	= sizeof(struct nft_object *),
5552 		.align	= __alignof__(struct nft_object *),
5553 	},
5554 	[NFT_SET_EXT_FLAGS]		= {
5555 		.len	= sizeof(u8),
5556 		.align	= __alignof__(u8),
5557 	},
5558 	[NFT_SET_EXT_TIMEOUT]		= {
5559 		.len	= sizeof(u64),
5560 		.align	= __alignof__(u64),
5561 	},
5562 	[NFT_SET_EXT_EXPIRATION]	= {
5563 		.len	= sizeof(u64),
5564 		.align	= __alignof__(u64),
5565 	},
5566 	[NFT_SET_EXT_USERDATA]		= {
5567 		.len	= sizeof(struct nft_userdata),
5568 		.align	= __alignof__(struct nft_userdata),
5569 	},
5570 	[NFT_SET_EXT_KEY_END]		= {
5571 		.align	= __alignof__(u32),
5572 	},
5573 };
5574 
5575 /*
5576  * Set elements
5577  */
5578 
5579 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5580 	[NFTA_SET_ELEM_KEY]		= { .type = NLA_NESTED },
5581 	[NFTA_SET_ELEM_DATA]		= { .type = NLA_NESTED },
5582 	[NFTA_SET_ELEM_FLAGS]		= { .type = NLA_U32 },
5583 	[NFTA_SET_ELEM_TIMEOUT]		= { .type = NLA_U64 },
5584 	[NFTA_SET_ELEM_EXPIRATION]	= { .type = NLA_U64 },
5585 	[NFTA_SET_ELEM_USERDATA]	= { .type = NLA_BINARY,
5586 					    .len = NFT_USERDATA_MAXLEN },
5587 	[NFTA_SET_ELEM_EXPR]		= { .type = NLA_NESTED },
5588 	[NFTA_SET_ELEM_OBJREF]		= { .type = NLA_STRING,
5589 					    .len = NFT_OBJ_MAXNAMELEN - 1 },
5590 	[NFTA_SET_ELEM_KEY_END]		= { .type = NLA_NESTED },
5591 	[NFTA_SET_ELEM_EXPRESSIONS]	= { .type = NLA_NESTED },
5592 };
5593 
5594 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5595 	[NFTA_SET_ELEM_LIST_TABLE]	= { .type = NLA_STRING,
5596 					    .len = NFT_TABLE_MAXNAMELEN - 1 },
5597 	[NFTA_SET_ELEM_LIST_SET]	= { .type = NLA_STRING,
5598 					    .len = NFT_SET_MAXNAMELEN - 1 },
5599 	[NFTA_SET_ELEM_LIST_ELEMENTS]	= { .type = NLA_NESTED },
5600 	[NFTA_SET_ELEM_LIST_SET_ID]	= { .type = NLA_U32 },
5601 };
5602 
nft_set_elem_expr_dump(struct sk_buff * skb,const struct nft_set * set,const struct nft_set_ext * ext,bool reset)5603 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5604 				  const struct nft_set *set,
5605 				  const struct nft_set_ext *ext,
5606 				  bool reset)
5607 {
5608 	struct nft_set_elem_expr *elem_expr;
5609 	u32 size, num_exprs = 0;
5610 	struct nft_expr *expr;
5611 	struct nlattr *nest;
5612 
5613 	elem_expr = nft_set_ext_expr(ext);
5614 	nft_setelem_expr_foreach(expr, elem_expr, size)
5615 		num_exprs++;
5616 
5617 	if (num_exprs == 1) {
5618 		expr = nft_setelem_expr_at(elem_expr, 0);
5619 		if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5620 			return -1;
5621 
5622 		return 0;
5623 	} else if (num_exprs > 1) {
5624 		nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5625 		if (nest == NULL)
5626 			goto nla_put_failure;
5627 
5628 		nft_setelem_expr_foreach(expr, elem_expr, size) {
5629 			expr = nft_setelem_expr_at(elem_expr, size);
5630 			if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5631 				goto nla_put_failure;
5632 		}
5633 		nla_nest_end(skb, nest);
5634 	}
5635 	return 0;
5636 
5637 nla_put_failure:
5638 	return -1;
5639 }
5640 
nf_tables_fill_setelem(struct sk_buff * skb,const struct nft_set * set,const struct nft_set_elem * elem,bool reset)5641 static int nf_tables_fill_setelem(struct sk_buff *skb,
5642 				  const struct nft_set *set,
5643 				  const struct nft_set_elem *elem,
5644 				  bool reset)
5645 {
5646 	const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5647 	unsigned char *b = skb_tail_pointer(skb);
5648 	struct nlattr *nest;
5649 
5650 	nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5651 	if (nest == NULL)
5652 		goto nla_put_failure;
5653 
5654 	if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5655 	    nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5656 			  NFT_DATA_VALUE, set->klen) < 0)
5657 		goto nla_put_failure;
5658 
5659 	if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5660 	    nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5661 			  NFT_DATA_VALUE, set->klen) < 0)
5662 		goto nla_put_failure;
5663 
5664 	if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5665 	    nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5666 			  nft_set_datatype(set), set->dlen) < 0)
5667 		goto nla_put_failure;
5668 
5669 	if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5670 	    nft_set_elem_expr_dump(skb, set, ext, reset))
5671 		goto nla_put_failure;
5672 
5673 	if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5674 	    nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5675 			   (*nft_set_ext_obj(ext))->key.name) < 0)
5676 		goto nla_put_failure;
5677 
5678 	if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5679 	    nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5680 		         htonl(*nft_set_ext_flags(ext))))
5681 		goto nla_put_failure;
5682 
5683 	if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5684 	    nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5685 			 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5686 			 NFTA_SET_ELEM_PAD))
5687 		goto nla_put_failure;
5688 
5689 	if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5690 		u64 expires, now = get_jiffies_64();
5691 
5692 		expires = *nft_set_ext_expiration(ext);
5693 		if (time_before64(now, expires))
5694 			expires -= now;
5695 		else
5696 			expires = 0;
5697 
5698 		if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5699 				 nf_jiffies64_to_msecs(expires),
5700 				 NFTA_SET_ELEM_PAD))
5701 			goto nla_put_failure;
5702 	}
5703 
5704 	if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5705 		struct nft_userdata *udata;
5706 
5707 		udata = nft_set_ext_userdata(ext);
5708 		if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5709 			    udata->len + 1, udata->data))
5710 			goto nla_put_failure;
5711 	}
5712 
5713 	nla_nest_end(skb, nest);
5714 	return 0;
5715 
5716 nla_put_failure:
5717 	nlmsg_trim(skb, b);
5718 	return -EMSGSIZE;
5719 }
5720 
5721 struct nft_set_dump_args {
5722 	const struct netlink_callback	*cb;
5723 	struct nft_set_iter		iter;
5724 	struct sk_buff			*skb;
5725 	bool				reset;
5726 };
5727 
nf_tables_dump_setelem(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)5728 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5729 				  struct nft_set *set,
5730 				  const struct nft_set_iter *iter,
5731 				  struct nft_set_elem *elem)
5732 {
5733 	const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5734 	struct nft_set_dump_args *args;
5735 
5736 	if (nft_set_elem_expired(ext) || nft_set_elem_is_dead(ext))
5737 		return 0;
5738 
5739 	args = container_of(iter, struct nft_set_dump_args, iter);
5740 	return nf_tables_fill_setelem(args->skb, set, elem, args->reset);
5741 }
5742 
audit_log_nft_set_reset(const struct nft_table * table,unsigned int base_seq,unsigned int nentries)5743 static void audit_log_nft_set_reset(const struct nft_table *table,
5744 				    unsigned int base_seq,
5745 				    unsigned int nentries)
5746 {
5747 	char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
5748 
5749 	audit_log_nfcfg(buf, table->family, nentries,
5750 			AUDIT_NFT_OP_SETELEM_RESET, GFP_ATOMIC);
5751 	kfree(buf);
5752 }
5753 
5754 struct nft_set_dump_ctx {
5755 	const struct nft_set	*set;
5756 	struct nft_ctx		ctx;
5757 };
5758 
nft_set_catchall_dump(struct net * net,struct sk_buff * skb,const struct nft_set * set,bool reset,unsigned int base_seq)5759 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5760 				 const struct nft_set *set, bool reset,
5761 				 unsigned int base_seq)
5762 {
5763 	struct nft_set_elem_catchall *catchall;
5764 	u8 genmask = nft_genmask_cur(net);
5765 	struct nft_set_elem elem;
5766 	struct nft_set_ext *ext;
5767 	int ret = 0;
5768 
5769 	list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5770 		ext = nft_set_elem_ext(set, catchall->elem);
5771 		if (!nft_set_elem_active(ext, genmask) ||
5772 		    nft_set_elem_expired(ext))
5773 			continue;
5774 
5775 		elem.priv = catchall->elem;
5776 		ret = nf_tables_fill_setelem(skb, set, &elem, reset);
5777 		if (reset && !ret)
5778 			audit_log_nft_set_reset(set->table, base_seq, 1);
5779 		break;
5780 	}
5781 
5782 	return ret;
5783 }
5784 
nf_tables_dump_set(struct sk_buff * skb,struct netlink_callback * cb)5785 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5786 {
5787 	struct nft_set_dump_ctx *dump_ctx = cb->data;
5788 	struct net *net = sock_net(skb->sk);
5789 	struct nftables_pernet *nft_net;
5790 	struct nft_table *table;
5791 	struct nft_set *set;
5792 	struct nft_set_dump_args args;
5793 	bool set_found = false;
5794 	struct nlmsghdr *nlh;
5795 	struct nlattr *nest;
5796 	bool reset = false;
5797 	u32 portid, seq;
5798 	int event;
5799 
5800 	rcu_read_lock();
5801 	nft_net = nft_pernet(net);
5802 	cb->seq = READ_ONCE(nft_net->base_seq);
5803 
5804 	list_for_each_entry_rcu(table, &nft_net->tables, list) {
5805 		if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5806 		    dump_ctx->ctx.family != table->family)
5807 			continue;
5808 
5809 		if (table != dump_ctx->ctx.table)
5810 			continue;
5811 
5812 		list_for_each_entry_rcu(set, &table->sets, list) {
5813 			if (set == dump_ctx->set) {
5814 				set_found = true;
5815 				break;
5816 			}
5817 		}
5818 		break;
5819 	}
5820 
5821 	if (!set_found) {
5822 		rcu_read_unlock();
5823 		return -ENOENT;
5824 	}
5825 
5826 	event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5827 	portid = NETLINK_CB(cb->skb).portid;
5828 	seq    = cb->nlh->nlmsg_seq;
5829 
5830 	nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5831 			   table->family, NFNETLINK_V0, nft_base_seq(net));
5832 	if (!nlh)
5833 		goto nla_put_failure;
5834 
5835 	if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5836 		goto nla_put_failure;
5837 	if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5838 		goto nla_put_failure;
5839 
5840 	nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5841 	if (nest == NULL)
5842 		goto nla_put_failure;
5843 
5844 	if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
5845 		reset = true;
5846 
5847 	args.cb			= cb;
5848 	args.skb		= skb;
5849 	args.reset		= reset;
5850 	args.iter.genmask	= nft_genmask_cur(net);
5851 	args.iter.type		= NFT_ITER_READ;
5852 	args.iter.skip		= cb->args[0];
5853 	args.iter.count		= 0;
5854 	args.iter.err		= 0;
5855 	args.iter.fn		= nf_tables_dump_setelem;
5856 	set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5857 
5858 	if (!args.iter.err && args.iter.count == cb->args[0])
5859 		args.iter.err = nft_set_catchall_dump(net, skb, set,
5860 						      reset, cb->seq);
5861 	nla_nest_end(skb, nest);
5862 	nlmsg_end(skb, nlh);
5863 
5864 	if (reset && args.iter.count > args.iter.skip)
5865 		audit_log_nft_set_reset(table, cb->seq,
5866 					args.iter.count - args.iter.skip);
5867 
5868 	rcu_read_unlock();
5869 
5870 	if (args.iter.err && args.iter.err != -EMSGSIZE)
5871 		return args.iter.err;
5872 	if (args.iter.count == cb->args[0])
5873 		return 0;
5874 
5875 	cb->args[0] = args.iter.count;
5876 	return skb->len;
5877 
5878 nla_put_failure:
5879 	rcu_read_unlock();
5880 	return -ENOSPC;
5881 }
5882 
nf_tables_dump_set_start(struct netlink_callback * cb)5883 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5884 {
5885 	struct nft_set_dump_ctx *dump_ctx = cb->data;
5886 
5887 	cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5888 
5889 	return cb->data ? 0 : -ENOMEM;
5890 }
5891 
nf_tables_dump_set_done(struct netlink_callback * cb)5892 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5893 {
5894 	kfree(cb->data);
5895 	return 0;
5896 }
5897 
nf_tables_fill_setelem_info(struct sk_buff * skb,const struct nft_ctx * ctx,u32 seq,u32 portid,int event,u16 flags,const struct nft_set * set,const struct nft_set_elem * elem,bool reset)5898 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5899 				       const struct nft_ctx *ctx, u32 seq,
5900 				       u32 portid, int event, u16 flags,
5901 				       const struct nft_set *set,
5902 				       const struct nft_set_elem *elem,
5903 				       bool reset)
5904 {
5905 	struct nlmsghdr *nlh;
5906 	struct nlattr *nest;
5907 	int err;
5908 
5909 	event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5910 	nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5911 			   NFNETLINK_V0, nft_base_seq(ctx->net));
5912 	if (!nlh)
5913 		goto nla_put_failure;
5914 
5915 	if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5916 		goto nla_put_failure;
5917 	if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5918 		goto nla_put_failure;
5919 
5920 	nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5921 	if (nest == NULL)
5922 		goto nla_put_failure;
5923 
5924 	err = nf_tables_fill_setelem(skb, set, elem, reset);
5925 	if (err < 0)
5926 		goto nla_put_failure;
5927 
5928 	nla_nest_end(skb, nest);
5929 
5930 	nlmsg_end(skb, nlh);
5931 	return 0;
5932 
5933 nla_put_failure:
5934 	nlmsg_trim(skb, nlh);
5935 	return -1;
5936 }
5937 
nft_setelem_parse_flags(const struct nft_set * set,const struct nlattr * attr,u32 * flags)5938 static int nft_setelem_parse_flags(const struct nft_set *set,
5939 				   const struct nlattr *attr, u32 *flags)
5940 {
5941 	if (attr == NULL)
5942 		return 0;
5943 
5944 	*flags = ntohl(nla_get_be32(attr));
5945 	if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5946 		return -EOPNOTSUPP;
5947 	if (!(set->flags & NFT_SET_INTERVAL) &&
5948 	    *flags & NFT_SET_ELEM_INTERVAL_END)
5949 		return -EINVAL;
5950 	if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5951 	    (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5952 		return -EINVAL;
5953 
5954 	return 0;
5955 }
5956 
nft_setelem_parse_key(struct nft_ctx * ctx,struct nft_set * set,struct nft_data * key,struct nlattr * attr)5957 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5958 				 struct nft_data *key, struct nlattr *attr)
5959 {
5960 	struct nft_data_desc desc = {
5961 		.type	= NFT_DATA_VALUE,
5962 		.size	= NFT_DATA_VALUE_MAXLEN,
5963 		.len	= set->klen,
5964 	};
5965 
5966 	return nft_data_init(ctx, key, &desc, attr);
5967 }
5968 
nft_setelem_parse_data(struct nft_ctx * ctx,struct nft_set * set,struct nft_data_desc * desc,struct nft_data * data,struct nlattr * attr)5969 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5970 				  struct nft_data_desc *desc,
5971 				  struct nft_data *data,
5972 				  struct nlattr *attr)
5973 {
5974 	u32 dtype;
5975 
5976 	if (set->dtype == NFT_DATA_VERDICT)
5977 		dtype = NFT_DATA_VERDICT;
5978 	else
5979 		dtype = NFT_DATA_VALUE;
5980 
5981 	desc->type = dtype;
5982 	desc->size = NFT_DATA_VALUE_MAXLEN;
5983 	desc->len = set->dlen;
5984 	desc->flags = NFT_DATA_DESC_SETELEM;
5985 
5986 	return nft_data_init(ctx, data, desc, attr);
5987 }
5988 
nft_setelem_catchall_get(const struct net * net,const struct nft_set * set)5989 static void *nft_setelem_catchall_get(const struct net *net,
5990 				      const struct nft_set *set)
5991 {
5992 	struct nft_set_elem_catchall *catchall;
5993 	u8 genmask = nft_genmask_cur(net);
5994 	struct nft_set_ext *ext;
5995 	void *priv = NULL;
5996 
5997 	list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5998 		ext = nft_set_elem_ext(set, catchall->elem);
5999 		if (!nft_set_elem_active(ext, genmask) ||
6000 		    nft_set_elem_expired(ext))
6001 			continue;
6002 
6003 		priv = catchall->elem;
6004 		break;
6005 	}
6006 
6007 	return priv;
6008 }
6009 
nft_setelem_get(struct nft_ctx * ctx,struct nft_set * set,struct nft_set_elem * elem,u32 flags)6010 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
6011 			   struct nft_set_elem *elem, u32 flags)
6012 {
6013 	void *priv;
6014 
6015 	if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6016 		priv = set->ops->get(ctx->net, set, elem, flags);
6017 		if (IS_ERR(priv))
6018 			return PTR_ERR(priv);
6019 	} else {
6020 		priv = nft_setelem_catchall_get(ctx->net, set);
6021 		if (!priv)
6022 			return -ENOENT;
6023 	}
6024 	elem->priv = priv;
6025 
6026 	return 0;
6027 }
6028 
nft_get_set_elem(struct nft_ctx * ctx,struct nft_set * set,const struct nlattr * attr,bool reset)6029 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6030 			    const struct nlattr *attr, bool reset)
6031 {
6032 	struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6033 	struct nft_set_elem elem;
6034 	struct sk_buff *skb;
6035 	uint32_t flags = 0;
6036 	int err;
6037 
6038 	err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6039 					  nft_set_elem_policy, NULL);
6040 	if (err < 0)
6041 		return err;
6042 
6043 	err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6044 	if (err < 0)
6045 		return err;
6046 
6047 	if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6048 		return -EINVAL;
6049 
6050 	if (nla[NFTA_SET_ELEM_KEY]) {
6051 		err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6052 					    nla[NFTA_SET_ELEM_KEY]);
6053 		if (err < 0)
6054 			return err;
6055 	}
6056 
6057 	if (nla[NFTA_SET_ELEM_KEY_END]) {
6058 		err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6059 					    nla[NFTA_SET_ELEM_KEY_END]);
6060 		if (err < 0)
6061 			return err;
6062 	}
6063 
6064 	err = nft_setelem_get(ctx, set, &elem, flags);
6065 	if (err < 0)
6066 		return err;
6067 
6068 	err = -ENOMEM;
6069 	skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
6070 	if (skb == NULL)
6071 		return err;
6072 
6073 	err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
6074 					  NFT_MSG_NEWSETELEM, 0, set, &elem,
6075 					  reset);
6076 	if (err < 0)
6077 		goto err_fill_setelem;
6078 
6079 	return nfnetlink_unicast(skb, ctx->net, ctx->portid);
6080 
6081 err_fill_setelem:
6082 	kfree_skb(skb);
6083 	return err;
6084 }
6085 
6086 /* called with rcu_read_lock held */
nf_tables_getsetelem(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])6087 static int nf_tables_getsetelem(struct sk_buff *skb,
6088 				const struct nfnl_info *info,
6089 				const struct nlattr * const nla[])
6090 {
6091 	struct netlink_ext_ack *extack = info->extack;
6092 	u8 genmask = nft_genmask_cur(info->net);
6093 	u8 family = info->nfmsg->nfgen_family;
6094 	int rem, err = 0, nelems = 0;
6095 	struct net *net = info->net;
6096 	struct nft_table *table;
6097 	struct nft_set *set;
6098 	struct nlattr *attr;
6099 	struct nft_ctx ctx;
6100 	bool reset = false;
6101 
6102 	table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6103 				 genmask, 0);
6104 	if (IS_ERR(table)) {
6105 		NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6106 		return PTR_ERR(table);
6107 	}
6108 
6109 	set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6110 	if (IS_ERR(set))
6111 		return PTR_ERR(set);
6112 
6113 	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6114 
6115 	if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6116 		struct netlink_dump_control c = {
6117 			.start = nf_tables_dump_set_start,
6118 			.dump = nf_tables_dump_set,
6119 			.done = nf_tables_dump_set_done,
6120 			.module = THIS_MODULE,
6121 		};
6122 		struct nft_set_dump_ctx dump_ctx = {
6123 			.set = set,
6124 			.ctx = ctx,
6125 		};
6126 
6127 		c.data = &dump_ctx;
6128 		return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6129 	}
6130 
6131 	if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6132 		return -EINVAL;
6133 
6134 	if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
6135 		reset = true;
6136 
6137 	nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6138 		err = nft_get_set_elem(&ctx, set, attr, reset);
6139 		if (err < 0) {
6140 			NL_SET_BAD_ATTR(extack, attr);
6141 			break;
6142 		}
6143 		nelems++;
6144 	}
6145 
6146 	if (reset)
6147 		audit_log_nft_set_reset(table, nft_pernet(net)->base_seq,
6148 					nelems);
6149 
6150 	return err;
6151 }
6152 
nf_tables_setelem_notify(const struct nft_ctx * ctx,const struct nft_set * set,const struct nft_set_elem * elem,int event)6153 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
6154 				     const struct nft_set *set,
6155 				     const struct nft_set_elem *elem,
6156 				     int event)
6157 {
6158 	struct nftables_pernet *nft_net;
6159 	struct net *net = ctx->net;
6160 	u32 portid = ctx->portid;
6161 	struct sk_buff *skb;
6162 	u16 flags = 0;
6163 	int err;
6164 
6165 	if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6166 		return;
6167 
6168 	skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6169 	if (skb == NULL)
6170 		goto err;
6171 
6172 	if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6173 		flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6174 
6175 	err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6176 					  set, elem, false);
6177 	if (err < 0) {
6178 		kfree_skb(skb);
6179 		goto err;
6180 	}
6181 
6182 	nft_net = nft_pernet(net);
6183 	nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6184 	return;
6185 err:
6186 	nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6187 }
6188 
nft_trans_elem_alloc(struct nft_ctx * ctx,int msg_type,struct nft_set * set)6189 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6190 					      int msg_type,
6191 					      struct nft_set *set)
6192 {
6193 	struct nft_trans *trans;
6194 
6195 	trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6196 	if (trans == NULL)
6197 		return NULL;
6198 
6199 	nft_trans_elem_set(trans) = set;
6200 	return trans;
6201 }
6202 
nft_set_elem_expr_alloc(const struct nft_ctx * ctx,const struct nft_set * set,const struct nlattr * attr)6203 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6204 					 const struct nft_set *set,
6205 					 const struct nlattr *attr)
6206 {
6207 	struct nft_expr *expr;
6208 	int err;
6209 
6210 	expr = nft_expr_init(ctx, attr);
6211 	if (IS_ERR(expr))
6212 		return expr;
6213 
6214 	err = -EOPNOTSUPP;
6215 	if (expr->ops->type->flags & NFT_EXPR_GC) {
6216 		if (set->flags & NFT_SET_TIMEOUT)
6217 			goto err_set_elem_expr;
6218 		if (!set->ops->gc_init)
6219 			goto err_set_elem_expr;
6220 		set->ops->gc_init(set);
6221 	}
6222 
6223 	return expr;
6224 
6225 err_set_elem_expr:
6226 	nft_expr_destroy(ctx, expr);
6227 	return ERR_PTR(err);
6228 }
6229 
nft_set_ext_check(const struct nft_set_ext_tmpl * tmpl,u8 id,u32 len)6230 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6231 {
6232 	len += nft_set_ext_types[id].len;
6233 	if (len > tmpl->ext_len[id] ||
6234 	    len > U8_MAX)
6235 		return -1;
6236 
6237 	return 0;
6238 }
6239 
nft_set_ext_memcpy(const struct nft_set_ext_tmpl * tmpl,u8 id,void * to,const void * from,u32 len)6240 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6241 			      void *to, const void *from, u32 len)
6242 {
6243 	if (nft_set_ext_check(tmpl, id, len) < 0)
6244 		return -1;
6245 
6246 	memcpy(to, from, len);
6247 
6248 	return 0;
6249 }
6250 
nft_set_elem_init(const struct nft_set * set,const struct nft_set_ext_tmpl * tmpl,const u32 * key,const u32 * key_end,const u32 * data,u64 timeout,u64 expiration,gfp_t gfp)6251 void *nft_set_elem_init(const struct nft_set *set,
6252 			const struct nft_set_ext_tmpl *tmpl,
6253 			const u32 *key, const u32 *key_end,
6254 			const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
6255 {
6256 	struct nft_set_ext *ext;
6257 	void *elem;
6258 
6259 	elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6260 	if (elem == NULL)
6261 		return ERR_PTR(-ENOMEM);
6262 
6263 	ext = nft_set_elem_ext(set, elem);
6264 	nft_set_ext_init(ext, tmpl);
6265 
6266 	if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6267 	    nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6268 			       nft_set_ext_key(ext), key, set->klen) < 0)
6269 		goto err_ext_check;
6270 
6271 	if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6272 	    nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6273 			       nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6274 		goto err_ext_check;
6275 
6276 	if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6277 	    nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6278 			       nft_set_ext_data(ext), data, set->dlen) < 0)
6279 		goto err_ext_check;
6280 
6281 	if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6282 		*nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6283 		if (expiration == 0)
6284 			*nft_set_ext_expiration(ext) += timeout;
6285 	}
6286 	if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6287 		*nft_set_ext_timeout(ext) = timeout;
6288 
6289 	return elem;
6290 
6291 err_ext_check:
6292 	kfree(elem);
6293 
6294 	return ERR_PTR(-EINVAL);
6295 }
6296 
__nft_set_elem_expr_destroy(const struct nft_ctx * ctx,struct nft_expr * expr)6297 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6298 					struct nft_expr *expr)
6299 {
6300 	if (expr->ops->destroy_clone) {
6301 		expr->ops->destroy_clone(ctx, expr);
6302 		module_put(expr->ops->type->owner);
6303 	} else {
6304 		nf_tables_expr_destroy(ctx, expr);
6305 	}
6306 }
6307 
nft_set_elem_expr_destroy(const struct nft_ctx * ctx,struct nft_set_elem_expr * elem_expr)6308 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6309 				      struct nft_set_elem_expr *elem_expr)
6310 {
6311 	struct nft_expr *expr;
6312 	u32 size;
6313 
6314 	nft_setelem_expr_foreach(expr, elem_expr, size)
6315 		__nft_set_elem_expr_destroy(ctx, expr);
6316 }
6317 
6318 /* Drop references and destroy. Called from gc, dynset and abort path. */
nft_set_elem_destroy(const struct nft_set * set,void * elem,bool destroy_expr)6319 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
6320 			  bool destroy_expr)
6321 {
6322 	struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6323 	struct nft_ctx ctx = {
6324 		.net	= read_pnet(&set->net),
6325 		.family	= set->table->family,
6326 	};
6327 
6328 	nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6329 	if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6330 		nft_data_release(nft_set_ext_data(ext), set->dtype);
6331 	if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6332 		nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6333 
6334 	if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6335 		nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6336 	kfree(elem);
6337 }
6338 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6339 
6340 /* Destroy element. References have been already dropped in the preparation
6341  * path via nft_setelem_data_deactivate().
6342  */
nf_tables_set_elem_destroy(const struct nft_ctx * ctx,const struct nft_set * set,void * elem)6343 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6344 				const struct nft_set *set, void *elem)
6345 {
6346 	struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6347 
6348 	if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6349 		nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6350 
6351 	kfree(elem);
6352 }
6353 
nft_set_elem_expr_clone(const struct nft_ctx * ctx,struct nft_set * set,struct nft_expr * expr_array[])6354 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6355 			    struct nft_expr *expr_array[])
6356 {
6357 	struct nft_expr *expr;
6358 	int err, i, k;
6359 
6360 	for (i = 0; i < set->num_exprs; i++) {
6361 		expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6362 		if (!expr)
6363 			goto err_expr;
6364 
6365 		err = nft_expr_clone(expr, set->exprs[i]);
6366 		if (err < 0) {
6367 			kfree(expr);
6368 			goto err_expr;
6369 		}
6370 		expr_array[i] = expr;
6371 	}
6372 
6373 	return 0;
6374 
6375 err_expr:
6376 	for (k = i - 1; k >= 0; k--)
6377 		nft_expr_destroy(ctx, expr_array[k]);
6378 
6379 	return -ENOMEM;
6380 }
6381 
nft_set_elem_expr_setup(struct nft_ctx * ctx,const struct nft_set_ext_tmpl * tmpl,const struct nft_set_ext * ext,struct nft_expr * expr_array[],u32 num_exprs)6382 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6383 				   const struct nft_set_ext_tmpl *tmpl,
6384 				   const struct nft_set_ext *ext,
6385 				   struct nft_expr *expr_array[],
6386 				   u32 num_exprs)
6387 {
6388 	struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6389 	u32 len = sizeof(struct nft_set_elem_expr);
6390 	struct nft_expr *expr;
6391 	int i, err;
6392 
6393 	if (num_exprs == 0)
6394 		return 0;
6395 
6396 	for (i = 0; i < num_exprs; i++)
6397 		len += expr_array[i]->ops->size;
6398 
6399 	if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6400 		return -EINVAL;
6401 
6402 	for (i = 0; i < num_exprs; i++) {
6403 		expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6404 		err = nft_expr_clone(expr, expr_array[i]);
6405 		if (err < 0)
6406 			goto err_elem_expr_setup;
6407 
6408 		elem_expr->size += expr_array[i]->ops->size;
6409 		nft_expr_destroy(ctx, expr_array[i]);
6410 		expr_array[i] = NULL;
6411 	}
6412 
6413 	return 0;
6414 
6415 err_elem_expr_setup:
6416 	for (; i < num_exprs; i++) {
6417 		nft_expr_destroy(ctx, expr_array[i]);
6418 		expr_array[i] = NULL;
6419 	}
6420 
6421 	return -ENOMEM;
6422 }
6423 
nft_set_catchall_lookup(const struct net * net,const struct nft_set * set)6424 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6425 					    const struct nft_set *set)
6426 {
6427 	struct nft_set_elem_catchall *catchall;
6428 	u8 genmask = nft_genmask_cur(net);
6429 	struct nft_set_ext *ext;
6430 
6431 	list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6432 		ext = nft_set_elem_ext(set, catchall->elem);
6433 		if (nft_set_elem_active(ext, genmask) &&
6434 		    !nft_set_elem_expired(ext) &&
6435 		    !nft_set_elem_is_dead(ext))
6436 			return ext;
6437 	}
6438 
6439 	return NULL;
6440 }
6441 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6442 
nft_setelem_catchall_insert(const struct net * net,struct nft_set * set,const struct nft_set_elem * elem,struct nft_set_ext ** pext)6443 static int nft_setelem_catchall_insert(const struct net *net,
6444 				       struct nft_set *set,
6445 				       const struct nft_set_elem *elem,
6446 				       struct nft_set_ext **pext)
6447 {
6448 	struct nft_set_elem_catchall *catchall;
6449 	u8 genmask = nft_genmask_next(net);
6450 	struct nft_set_ext *ext;
6451 
6452 	list_for_each_entry(catchall, &set->catchall_list, list) {
6453 		ext = nft_set_elem_ext(set, catchall->elem);
6454 		if (nft_set_elem_active(ext, genmask)) {
6455 			*pext = ext;
6456 			return -EEXIST;
6457 		}
6458 	}
6459 
6460 	catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6461 	if (!catchall)
6462 		return -ENOMEM;
6463 
6464 	catchall->elem = elem->priv;
6465 	list_add_tail_rcu(&catchall->list, &set->catchall_list);
6466 
6467 	return 0;
6468 }
6469 
nft_setelem_insert(const struct net * net,struct nft_set * set,const struct nft_set_elem * elem,struct nft_set_ext ** ext,unsigned int flags)6470 static int nft_setelem_insert(const struct net *net,
6471 			      struct nft_set *set,
6472 			      const struct nft_set_elem *elem,
6473 			      struct nft_set_ext **ext, unsigned int flags)
6474 {
6475 	int ret;
6476 
6477 	if (flags & NFT_SET_ELEM_CATCHALL)
6478 		ret = nft_setelem_catchall_insert(net, set, elem, ext);
6479 	else
6480 		ret = set->ops->insert(net, set, elem, ext);
6481 
6482 	return ret;
6483 }
6484 
nft_setelem_is_catchall(const struct nft_set * set,const struct nft_set_elem * elem)6485 static bool nft_setelem_is_catchall(const struct nft_set *set,
6486 				    const struct nft_set_elem *elem)
6487 {
6488 	struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6489 
6490 	if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6491 	    *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6492 		return true;
6493 
6494 	return false;
6495 }
6496 
nft_setelem_activate(struct net * net,struct nft_set * set,struct nft_set_elem * elem)6497 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6498 				 struct nft_set_elem *elem)
6499 {
6500 	struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6501 
6502 	if (nft_setelem_is_catchall(set, elem)) {
6503 		nft_set_elem_change_active(net, set, ext);
6504 	} else {
6505 		set->ops->activate(net, set, elem);
6506 	}
6507 }
6508 
nft_setelem_catchall_deactivate(const struct net * net,struct nft_set * set,struct nft_set_elem * elem)6509 static int nft_setelem_catchall_deactivate(const struct net *net,
6510 					   struct nft_set *set,
6511 					   struct nft_set_elem *elem)
6512 {
6513 	struct nft_set_elem_catchall *catchall;
6514 	struct nft_set_ext *ext;
6515 
6516 	list_for_each_entry(catchall, &set->catchall_list, list) {
6517 		ext = nft_set_elem_ext(set, catchall->elem);
6518 		if (!nft_is_active_next(net, ext))
6519 			continue;
6520 
6521 		kfree(elem->priv);
6522 		elem->priv = catchall->elem;
6523 		nft_set_elem_change_active(net, set, ext);
6524 		return 0;
6525 	}
6526 
6527 	return -ENOENT;
6528 }
6529 
__nft_setelem_deactivate(const struct net * net,struct nft_set * set,struct nft_set_elem * elem)6530 static int __nft_setelem_deactivate(const struct net *net,
6531 				    struct nft_set *set,
6532 				    struct nft_set_elem *elem)
6533 {
6534 	void *priv;
6535 
6536 	priv = set->ops->deactivate(net, set, elem);
6537 	if (!priv)
6538 		return -ENOENT;
6539 
6540 	kfree(elem->priv);
6541 	elem->priv = priv;
6542 	set->ndeact++;
6543 
6544 	return 0;
6545 }
6546 
nft_setelem_deactivate(const struct net * net,struct nft_set * set,struct nft_set_elem * elem,u32 flags)6547 static int nft_setelem_deactivate(const struct net *net,
6548 				  struct nft_set *set,
6549 				  struct nft_set_elem *elem, u32 flags)
6550 {
6551 	int ret;
6552 
6553 	if (flags & NFT_SET_ELEM_CATCHALL)
6554 		ret = nft_setelem_catchall_deactivate(net, set, elem);
6555 	else
6556 		ret = __nft_setelem_deactivate(net, set, elem);
6557 
6558 	return ret;
6559 }
6560 
nft_setelem_catchall_destroy(struct nft_set_elem_catchall * catchall)6561 static void nft_setelem_catchall_destroy(struct nft_set_elem_catchall *catchall)
6562 {
6563 	list_del_rcu(&catchall->list);
6564 	kfree_rcu(catchall, rcu);
6565 }
6566 
nft_setelem_catchall_remove(const struct net * net,const struct nft_set * set,const struct nft_set_elem * elem)6567 static void nft_setelem_catchall_remove(const struct net *net,
6568 					const struct nft_set *set,
6569 					const struct nft_set_elem *elem)
6570 {
6571 	struct nft_set_elem_catchall *catchall, *next;
6572 
6573 	list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6574 		if (catchall->elem == elem->priv) {
6575 			nft_setelem_catchall_destroy(catchall);
6576 			break;
6577 		}
6578 	}
6579 }
6580 
nft_setelem_remove(const struct net * net,const struct nft_set * set,const struct nft_set_elem * elem)6581 static void nft_setelem_remove(const struct net *net,
6582 			       const struct nft_set *set,
6583 			       const struct nft_set_elem *elem)
6584 {
6585 	if (nft_setelem_is_catchall(set, elem))
6586 		nft_setelem_catchall_remove(net, set, elem);
6587 	else
6588 		set->ops->remove(net, set, elem);
6589 }
6590 
nft_setelem_valid_key_end(const struct nft_set * set,struct nlattr ** nla,u32 flags)6591 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6592 				      struct nlattr **nla, u32 flags)
6593 {
6594 	if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6595 			  (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6596 		if (flags & NFT_SET_ELEM_INTERVAL_END)
6597 			return false;
6598 
6599 		if (nla[NFTA_SET_ELEM_KEY_END] &&
6600 		    flags & NFT_SET_ELEM_CATCHALL)
6601 			return false;
6602 	} else {
6603 		if (nla[NFTA_SET_ELEM_KEY_END])
6604 			return false;
6605 	}
6606 
6607 	return true;
6608 }
6609 
nft_add_set_elem(struct nft_ctx * ctx,struct nft_set * set,const struct nlattr * attr,u32 nlmsg_flags)6610 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6611 			    const struct nlattr *attr, u32 nlmsg_flags)
6612 {
6613 	struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6614 	struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6615 	u8 genmask = nft_genmask_next(ctx->net);
6616 	u32 flags = 0, size = 0, num_exprs = 0;
6617 	struct nft_set_ext_tmpl tmpl;
6618 	struct nft_set_ext *ext, *ext2;
6619 	struct nft_set_elem elem;
6620 	struct nft_set_binding *binding;
6621 	struct nft_object *obj = NULL;
6622 	struct nft_userdata *udata;
6623 	struct nft_data_desc desc;
6624 	enum nft_registers dreg;
6625 	struct nft_trans *trans;
6626 	u64 timeout;
6627 	u64 expiration;
6628 	int err, i;
6629 	u8 ulen;
6630 
6631 	err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6632 					  nft_set_elem_policy, NULL);
6633 	if (err < 0)
6634 		return err;
6635 
6636 	nft_set_ext_prepare(&tmpl);
6637 
6638 	err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6639 	if (err < 0)
6640 		return err;
6641 
6642 	if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6643 	    (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6644 		return -EINVAL;
6645 
6646 	if (flags != 0) {
6647 		err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6648 		if (err < 0)
6649 			return err;
6650 	}
6651 
6652 	if (set->flags & NFT_SET_MAP) {
6653 		if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6654 		    !(flags & NFT_SET_ELEM_INTERVAL_END))
6655 			return -EINVAL;
6656 	} else {
6657 		if (nla[NFTA_SET_ELEM_DATA] != NULL)
6658 			return -EINVAL;
6659 	}
6660 
6661 	if (set->flags & NFT_SET_OBJECT) {
6662 		if (!nla[NFTA_SET_ELEM_OBJREF] &&
6663 		    !(flags & NFT_SET_ELEM_INTERVAL_END))
6664 			return -EINVAL;
6665 	} else {
6666 		if (nla[NFTA_SET_ELEM_OBJREF])
6667 			return -EINVAL;
6668 	}
6669 
6670 	if (!nft_setelem_valid_key_end(set, nla, flags))
6671 		return -EINVAL;
6672 
6673 	if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6674 	     (nla[NFTA_SET_ELEM_DATA] ||
6675 	      nla[NFTA_SET_ELEM_OBJREF] ||
6676 	      nla[NFTA_SET_ELEM_TIMEOUT] ||
6677 	      nla[NFTA_SET_ELEM_EXPIRATION] ||
6678 	      nla[NFTA_SET_ELEM_USERDATA] ||
6679 	      nla[NFTA_SET_ELEM_EXPR] ||
6680 	      nla[NFTA_SET_ELEM_KEY_END] ||
6681 	      nla[NFTA_SET_ELEM_EXPRESSIONS]))
6682 		return -EINVAL;
6683 
6684 	timeout = 0;
6685 	if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6686 		if (!(set->flags & NFT_SET_TIMEOUT))
6687 			return -EINVAL;
6688 		err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6689 					    &timeout);
6690 		if (err)
6691 			return err;
6692 	} else if (set->flags & NFT_SET_TIMEOUT &&
6693 		   !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6694 		timeout = READ_ONCE(set->timeout);
6695 	}
6696 
6697 	expiration = 0;
6698 	if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6699 		if (!(set->flags & NFT_SET_TIMEOUT))
6700 			return -EINVAL;
6701 		err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6702 					    &expiration);
6703 		if (err)
6704 			return err;
6705 	}
6706 
6707 	if (nla[NFTA_SET_ELEM_EXPR]) {
6708 		struct nft_expr *expr;
6709 
6710 		if (set->num_exprs && set->num_exprs != 1)
6711 			return -EOPNOTSUPP;
6712 
6713 		expr = nft_set_elem_expr_alloc(ctx, set,
6714 					       nla[NFTA_SET_ELEM_EXPR]);
6715 		if (IS_ERR(expr))
6716 			return PTR_ERR(expr);
6717 
6718 		expr_array[0] = expr;
6719 		num_exprs = 1;
6720 
6721 		if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6722 			err = -EOPNOTSUPP;
6723 			goto err_set_elem_expr;
6724 		}
6725 	} else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6726 		struct nft_expr *expr;
6727 		struct nlattr *tmp;
6728 		int left;
6729 
6730 		i = 0;
6731 		nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6732 			if (i == NFT_SET_EXPR_MAX ||
6733 			    (set->num_exprs && set->num_exprs == i)) {
6734 				err = -E2BIG;
6735 				goto err_set_elem_expr;
6736 			}
6737 			if (nla_type(tmp) != NFTA_LIST_ELEM) {
6738 				err = -EINVAL;
6739 				goto err_set_elem_expr;
6740 			}
6741 			expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6742 			if (IS_ERR(expr)) {
6743 				err = PTR_ERR(expr);
6744 				goto err_set_elem_expr;
6745 			}
6746 			expr_array[i] = expr;
6747 			num_exprs++;
6748 
6749 			if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6750 				err = -EOPNOTSUPP;
6751 				goto err_set_elem_expr;
6752 			}
6753 			i++;
6754 		}
6755 		if (set->num_exprs && set->num_exprs != i) {
6756 			err = -EOPNOTSUPP;
6757 			goto err_set_elem_expr;
6758 		}
6759 	} else if (set->num_exprs > 0 &&
6760 		   !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6761 		err = nft_set_elem_expr_clone(ctx, set, expr_array);
6762 		if (err < 0)
6763 			goto err_set_elem_expr_clone;
6764 
6765 		num_exprs = set->num_exprs;
6766 	}
6767 
6768 	if (nla[NFTA_SET_ELEM_KEY]) {
6769 		err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6770 					    nla[NFTA_SET_ELEM_KEY]);
6771 		if (err < 0)
6772 			goto err_set_elem_expr;
6773 
6774 		err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6775 		if (err < 0)
6776 			goto err_parse_key;
6777 	}
6778 
6779 	if (nla[NFTA_SET_ELEM_KEY_END]) {
6780 		err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6781 					    nla[NFTA_SET_ELEM_KEY_END]);
6782 		if (err < 0)
6783 			goto err_parse_key;
6784 
6785 		err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6786 		if (err < 0)
6787 			goto err_parse_key_end;
6788 	}
6789 
6790 	if (timeout > 0) {
6791 		err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6792 		if (err < 0)
6793 			goto err_parse_key_end;
6794 
6795 		if (timeout != READ_ONCE(set->timeout)) {
6796 			err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6797 			if (err < 0)
6798 				goto err_parse_key_end;
6799 		}
6800 	}
6801 
6802 	if (num_exprs) {
6803 		for (i = 0; i < num_exprs; i++)
6804 			size += expr_array[i]->ops->size;
6805 
6806 		err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6807 					     sizeof(struct nft_set_elem_expr) + size);
6808 		if (err < 0)
6809 			goto err_parse_key_end;
6810 	}
6811 
6812 	if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6813 		obj = nft_obj_lookup(ctx->net, ctx->table,
6814 				     nla[NFTA_SET_ELEM_OBJREF],
6815 				     set->objtype, genmask);
6816 		if (IS_ERR(obj)) {
6817 			err = PTR_ERR(obj);
6818 			obj = NULL;
6819 			goto err_parse_key_end;
6820 		}
6821 
6822 		if (!nft_use_inc(&obj->use)) {
6823 			err = -EMFILE;
6824 			obj = NULL;
6825 			goto err_parse_key_end;
6826 		}
6827 
6828 		err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6829 		if (err < 0)
6830 			goto err_parse_key_end;
6831 	}
6832 
6833 	if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6834 		err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6835 					     nla[NFTA_SET_ELEM_DATA]);
6836 		if (err < 0)
6837 			goto err_parse_key_end;
6838 
6839 		dreg = nft_type_to_reg(set->dtype);
6840 		list_for_each_entry(binding, &set->bindings, list) {
6841 			struct nft_ctx bind_ctx = {
6842 				.net	= ctx->net,
6843 				.family	= ctx->family,
6844 				.table	= ctx->table,
6845 				.chain	= (struct nft_chain *)binding->chain,
6846 			};
6847 
6848 			if (!(binding->flags & NFT_SET_MAP))
6849 				continue;
6850 
6851 			err = nft_validate_register_store(&bind_ctx, dreg,
6852 							  &elem.data.val,
6853 							  desc.type, desc.len);
6854 			if (err < 0)
6855 				goto err_parse_data;
6856 
6857 			if (desc.type == NFT_DATA_VERDICT &&
6858 			    (elem.data.val.verdict.code == NFT_GOTO ||
6859 			     elem.data.val.verdict.code == NFT_JUMP))
6860 				nft_validate_state_update(ctx->table,
6861 							  NFT_VALIDATE_NEED);
6862 		}
6863 
6864 		err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6865 		if (err < 0)
6866 			goto err_parse_data;
6867 	}
6868 
6869 	/* The full maximum length of userdata can exceed the maximum
6870 	 * offset value (U8_MAX) for following extensions, therefor it
6871 	 * must be the last extension added.
6872 	 */
6873 	ulen = 0;
6874 	if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6875 		ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6876 		if (ulen > 0) {
6877 			err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6878 						     ulen);
6879 			if (err < 0)
6880 				goto err_parse_data;
6881 		}
6882 	}
6883 
6884 	elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6885 				      elem.key_end.val.data, elem.data.val.data,
6886 				      timeout, expiration, GFP_KERNEL_ACCOUNT);
6887 	if (IS_ERR(elem.priv)) {
6888 		err = PTR_ERR(elem.priv);
6889 		goto err_parse_data;
6890 	}
6891 
6892 	ext = nft_set_elem_ext(set, elem.priv);
6893 	if (flags)
6894 		*nft_set_ext_flags(ext) = flags;
6895 
6896 	if (obj)
6897 		*nft_set_ext_obj(ext) = obj;
6898 
6899 	if (ulen > 0) {
6900 		if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6901 			err = -EINVAL;
6902 			goto err_elem_free;
6903 		}
6904 		udata = nft_set_ext_userdata(ext);
6905 		udata->len = ulen - 1;
6906 		nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6907 	}
6908 	err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6909 	if (err < 0)
6910 		goto err_elem_free;
6911 
6912 	trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6913 	if (trans == NULL) {
6914 		err = -ENOMEM;
6915 		goto err_elem_free;
6916 	}
6917 
6918 	ext->genmask = nft_genmask_cur(ctx->net);
6919 
6920 	err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6921 	if (err) {
6922 		if (err == -EEXIST) {
6923 			if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6924 			    nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6925 			    nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6926 			    nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6927 				goto err_element_clash;
6928 			if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6929 			     nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6930 			     memcmp(nft_set_ext_data(ext),
6931 				    nft_set_ext_data(ext2), set->dlen) != 0) ||
6932 			    (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6933 			     nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6934 			     *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6935 				goto err_element_clash;
6936 			else if (!(nlmsg_flags & NLM_F_EXCL))
6937 				err = 0;
6938 		} else if (err == -ENOTEMPTY) {
6939 			/* ENOTEMPTY reports overlapping between this element
6940 			 * and an existing one.
6941 			 */
6942 			err = -EEXIST;
6943 		}
6944 		goto err_element_clash;
6945 	}
6946 
6947 	if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6948 		unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
6949 
6950 		if (!atomic_add_unless(&set->nelems, 1, max)) {
6951 			err = -ENFILE;
6952 			goto err_set_full;
6953 		}
6954 	}
6955 
6956 	nft_trans_elem(trans) = elem;
6957 	nft_trans_commit_list_add_tail(ctx->net, trans);
6958 	return 0;
6959 
6960 err_set_full:
6961 	nft_setelem_remove(ctx->net, set, &elem);
6962 err_element_clash:
6963 	kfree(trans);
6964 err_elem_free:
6965 	nf_tables_set_elem_destroy(ctx, set, elem.priv);
6966 err_parse_data:
6967 	if (nla[NFTA_SET_ELEM_DATA] != NULL)
6968 		nft_data_release(&elem.data.val, desc.type);
6969 err_parse_key_end:
6970 	if (obj)
6971 		nft_use_dec_restore(&obj->use);
6972 
6973 	nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6974 err_parse_key:
6975 	nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6976 err_set_elem_expr:
6977 	for (i = 0; i < num_exprs && expr_array[i]; i++)
6978 		nft_expr_destroy(ctx, expr_array[i]);
6979 err_set_elem_expr_clone:
6980 	return err;
6981 }
6982 
nf_tables_newsetelem(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])6983 static int nf_tables_newsetelem(struct sk_buff *skb,
6984 				const struct nfnl_info *info,
6985 				const struct nlattr * const nla[])
6986 {
6987 	struct netlink_ext_ack *extack = info->extack;
6988 	u8 genmask = nft_genmask_next(info->net);
6989 	u8 family = info->nfmsg->nfgen_family;
6990 	struct net *net = info->net;
6991 	const struct nlattr *attr;
6992 	struct nft_table *table;
6993 	struct nft_set *set;
6994 	struct nft_ctx ctx;
6995 	int rem, err;
6996 
6997 	if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6998 		return -EINVAL;
6999 
7000 	table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7001 				 genmask, NETLINK_CB(skb).portid);
7002 	if (IS_ERR(table)) {
7003 		NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7004 		return PTR_ERR(table);
7005 	}
7006 
7007 	set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
7008 				    nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
7009 	if (IS_ERR(set))
7010 		return PTR_ERR(set);
7011 
7012 	if (!list_empty(&set->bindings) &&
7013 	    (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
7014 		return -EBUSY;
7015 
7016 	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7017 
7018 	nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7019 		err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
7020 		if (err < 0) {
7021 			NL_SET_BAD_ATTR(extack, attr);
7022 			return err;
7023 		}
7024 	}
7025 
7026 	if (table->validate_state == NFT_VALIDATE_DO)
7027 		return nft_table_validate(net, table);
7028 
7029 	return 0;
7030 }
7031 
7032 /**
7033  *	nft_data_hold - hold a nft_data item
7034  *
7035  *	@data: struct nft_data to release
7036  *	@type: type of data
7037  *
7038  *	Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7039  *	NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
7040  *	NFT_GOTO verdicts. This function must be called on active data objects
7041  *	from the second phase of the commit protocol.
7042  */
nft_data_hold(const struct nft_data * data,enum nft_data_types type)7043 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
7044 {
7045 	struct nft_chain *chain;
7046 
7047 	if (type == NFT_DATA_VERDICT) {
7048 		switch (data->verdict.code) {
7049 		case NFT_JUMP:
7050 		case NFT_GOTO:
7051 			chain = data->verdict.chain;
7052 			nft_use_inc_restore(&chain->use);
7053 			break;
7054 		}
7055 	}
7056 }
7057 
nft_setelem_data_activate(const struct net * net,const struct nft_set * set,struct nft_set_elem * elem)7058 static void nft_setelem_data_activate(const struct net *net,
7059 				      const struct nft_set *set,
7060 				      struct nft_set_elem *elem)
7061 {
7062 	const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
7063 
7064 	if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7065 		nft_data_hold(nft_set_ext_data(ext), set->dtype);
7066 	if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7067 		nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
7068 }
7069 
nft_setelem_data_deactivate(const struct net * net,const struct nft_set * set,struct nft_set_elem * elem)7070 void nft_setelem_data_deactivate(const struct net *net,
7071 				 const struct nft_set *set,
7072 				 struct nft_set_elem *elem)
7073 {
7074 	const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
7075 
7076 	if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7077 		nft_data_release(nft_set_ext_data(ext), set->dtype);
7078 	if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7079 		nft_use_dec(&(*nft_set_ext_obj(ext))->use);
7080 }
7081 
nft_del_setelem(struct nft_ctx * ctx,struct nft_set * set,const struct nlattr * attr)7082 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
7083 			   const struct nlattr *attr)
7084 {
7085 	struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
7086 	struct nft_set_ext_tmpl tmpl;
7087 	struct nft_set_elem elem;
7088 	struct nft_set_ext *ext;
7089 	struct nft_trans *trans;
7090 	u32 flags = 0;
7091 	int err;
7092 
7093 	err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
7094 					  nft_set_elem_policy, NULL);
7095 	if (err < 0)
7096 		return err;
7097 
7098 	err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
7099 	if (err < 0)
7100 		return err;
7101 
7102 	if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
7103 		return -EINVAL;
7104 
7105 	if (!nft_setelem_valid_key_end(set, nla, flags))
7106 		return -EINVAL;
7107 
7108 	nft_set_ext_prepare(&tmpl);
7109 
7110 	if (flags != 0) {
7111 		err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
7112 		if (err < 0)
7113 			return err;
7114 	}
7115 
7116 	if (nla[NFTA_SET_ELEM_KEY]) {
7117 		err = nft_setelem_parse_key(ctx, set, &elem.key.val,
7118 					    nla[NFTA_SET_ELEM_KEY]);
7119 		if (err < 0)
7120 			return err;
7121 
7122 		err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7123 		if (err < 0)
7124 			goto fail_elem;
7125 	}
7126 
7127 	if (nla[NFTA_SET_ELEM_KEY_END]) {
7128 		err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
7129 					    nla[NFTA_SET_ELEM_KEY_END]);
7130 		if (err < 0)
7131 			goto fail_elem;
7132 
7133 		err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
7134 		if (err < 0)
7135 			goto fail_elem_key_end;
7136 	}
7137 
7138 	err = -ENOMEM;
7139 	elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7140 				      elem.key_end.val.data, NULL, 0, 0,
7141 				      GFP_KERNEL_ACCOUNT);
7142 	if (IS_ERR(elem.priv)) {
7143 		err = PTR_ERR(elem.priv);
7144 		goto fail_elem_key_end;
7145 	}
7146 
7147 	ext = nft_set_elem_ext(set, elem.priv);
7148 	if (flags)
7149 		*nft_set_ext_flags(ext) = flags;
7150 
7151 	trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7152 	if (trans == NULL)
7153 		goto fail_trans;
7154 
7155 	err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7156 	if (err < 0)
7157 		goto fail_ops;
7158 
7159 	nft_setelem_data_deactivate(ctx->net, set, &elem);
7160 
7161 	nft_trans_elem(trans) = elem;
7162 	nft_trans_commit_list_add_tail(ctx->net, trans);
7163 	return 0;
7164 
7165 fail_ops:
7166 	kfree(trans);
7167 fail_trans:
7168 	kfree(elem.priv);
7169 fail_elem_key_end:
7170 	nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7171 fail_elem:
7172 	nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7173 	return err;
7174 }
7175 
nft_setelem_flush(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)7176 static int nft_setelem_flush(const struct nft_ctx *ctx,
7177 			     struct nft_set *set,
7178 			     const struct nft_set_iter *iter,
7179 			     struct nft_set_elem *elem)
7180 {
7181 	struct nft_trans *trans;
7182 	int err;
7183 
7184 	trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7185 				    sizeof(struct nft_trans_elem), GFP_ATOMIC);
7186 	if (!trans)
7187 		return -ENOMEM;
7188 
7189 	if (!set->ops->flush(ctx->net, set, elem->priv)) {
7190 		err = -ENOENT;
7191 		goto err1;
7192 	}
7193 	set->ndeact++;
7194 
7195 	nft_setelem_data_deactivate(ctx->net, set, elem);
7196 	nft_trans_elem_set(trans) = set;
7197 	nft_trans_elem(trans) = *elem;
7198 	nft_trans_commit_list_add_tail(ctx->net, trans);
7199 
7200 	return 0;
7201 err1:
7202 	kfree(trans);
7203 	return err;
7204 }
7205 
__nft_set_catchall_flush(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_elem * elem)7206 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7207 				    struct nft_set *set,
7208 				    struct nft_set_elem *elem)
7209 {
7210 	struct nft_trans *trans;
7211 
7212 	trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7213 				    sizeof(struct nft_trans_elem), GFP_KERNEL);
7214 	if (!trans)
7215 		return -ENOMEM;
7216 
7217 	nft_setelem_data_deactivate(ctx->net, set, elem);
7218 	nft_trans_elem_set(trans) = set;
7219 	nft_trans_elem(trans) = *elem;
7220 	nft_trans_commit_list_add_tail(ctx->net, trans);
7221 
7222 	return 0;
7223 }
7224 
nft_set_catchall_flush(const struct nft_ctx * ctx,struct nft_set * set)7225 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7226 				  struct nft_set *set)
7227 {
7228 	u8 genmask = nft_genmask_next(ctx->net);
7229 	struct nft_set_elem_catchall *catchall;
7230 	struct nft_set_elem elem;
7231 	struct nft_set_ext *ext;
7232 	int ret = 0;
7233 
7234 	list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7235 		ext = nft_set_elem_ext(set, catchall->elem);
7236 		if (!nft_set_elem_active(ext, genmask))
7237 			continue;
7238 
7239 		elem.priv = catchall->elem;
7240 		ret = __nft_set_catchall_flush(ctx, set, &elem);
7241 		if (ret < 0)
7242 			break;
7243 		nft_set_elem_change_active(ctx->net, set, ext);
7244 	}
7245 
7246 	return ret;
7247 }
7248 
nft_set_flush(struct nft_ctx * ctx,struct nft_set * set,u8 genmask)7249 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7250 {
7251 	struct nft_set_iter iter = {
7252 		.genmask	= genmask,
7253 		.type		= NFT_ITER_UPDATE,
7254 		.fn		= nft_setelem_flush,
7255 	};
7256 
7257 	set->ops->walk(ctx, set, &iter);
7258 	if (!iter.err)
7259 		iter.err = nft_set_catchall_flush(ctx, set);
7260 
7261 	return iter.err;
7262 }
7263 
nf_tables_delsetelem(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])7264 static int nf_tables_delsetelem(struct sk_buff *skb,
7265 				const struct nfnl_info *info,
7266 				const struct nlattr * const nla[])
7267 {
7268 	struct netlink_ext_ack *extack = info->extack;
7269 	u8 genmask = nft_genmask_next(info->net);
7270 	u8 family = info->nfmsg->nfgen_family;
7271 	struct net *net = info->net;
7272 	const struct nlattr *attr;
7273 	struct nft_table *table;
7274 	struct nft_set *set;
7275 	struct nft_ctx ctx;
7276 	int rem, err = 0;
7277 
7278 	table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7279 				 genmask, NETLINK_CB(skb).portid);
7280 	if (IS_ERR(table)) {
7281 		NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7282 		return PTR_ERR(table);
7283 	}
7284 
7285 	set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7286 	if (IS_ERR(set))
7287 		return PTR_ERR(set);
7288 
7289 	if (nft_set_is_anonymous(set))
7290 		return -EOPNOTSUPP;
7291 
7292 	if (!list_empty(&set->bindings) && (set->flags & NFT_SET_CONSTANT))
7293 		return -EBUSY;
7294 
7295 	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7296 
7297 	if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7298 		return nft_set_flush(&ctx, set, genmask);
7299 
7300 	nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7301 		err = nft_del_setelem(&ctx, set, attr);
7302 		if (err == -ENOENT &&
7303 		    NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7304 			continue;
7305 
7306 		if (err < 0) {
7307 			NL_SET_BAD_ATTR(extack, attr);
7308 			return err;
7309 		}
7310 	}
7311 
7312 	return 0;
7313 }
7314 
7315 /*
7316  * Stateful objects
7317  */
7318 
7319 /**
7320  *	nft_register_obj- register nf_tables stateful object type
7321  *	@obj_type: object type
7322  *
7323  *	Registers the object type for use with nf_tables. Returns zero on
7324  *	success or a negative errno code otherwise.
7325  */
nft_register_obj(struct nft_object_type * obj_type)7326 int nft_register_obj(struct nft_object_type *obj_type)
7327 {
7328 	if (obj_type->type == NFT_OBJECT_UNSPEC)
7329 		return -EINVAL;
7330 
7331 	nfnl_lock(NFNL_SUBSYS_NFTABLES);
7332 	list_add_rcu(&obj_type->list, &nf_tables_objects);
7333 	nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7334 	return 0;
7335 }
7336 EXPORT_SYMBOL_GPL(nft_register_obj);
7337 
7338 /**
7339  *	nft_unregister_obj - unregister nf_tables object type
7340  *	@obj_type: object type
7341  *
7342  * 	Unregisters the object type for use with nf_tables.
7343  */
nft_unregister_obj(struct nft_object_type * obj_type)7344 void nft_unregister_obj(struct nft_object_type *obj_type)
7345 {
7346 	nfnl_lock(NFNL_SUBSYS_NFTABLES);
7347 	list_del_rcu(&obj_type->list);
7348 	nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7349 }
7350 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7351 
nft_obj_lookup(const struct net * net,const struct nft_table * table,const struct nlattr * nla,u32 objtype,u8 genmask)7352 struct nft_object *nft_obj_lookup(const struct net *net,
7353 				  const struct nft_table *table,
7354 				  const struct nlattr *nla, u32 objtype,
7355 				  u8 genmask)
7356 {
7357 	struct nft_object_hash_key k = { .table = table };
7358 	char search[NFT_OBJ_MAXNAMELEN];
7359 	struct rhlist_head *tmp, *list;
7360 	struct nft_object *obj;
7361 
7362 	nla_strscpy(search, nla, sizeof(search));
7363 	k.name = search;
7364 
7365 	WARN_ON_ONCE(!rcu_read_lock_held() &&
7366 		     !lockdep_commit_lock_is_held(net));
7367 
7368 	rcu_read_lock();
7369 	list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7370 	if (!list)
7371 		goto out;
7372 
7373 	rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7374 		if (objtype == obj->ops->type->type &&
7375 		    nft_active_genmask(obj, genmask)) {
7376 			rcu_read_unlock();
7377 			return obj;
7378 		}
7379 	}
7380 out:
7381 	rcu_read_unlock();
7382 	return ERR_PTR(-ENOENT);
7383 }
7384 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7385 
nft_obj_lookup_byhandle(const struct nft_table * table,const struct nlattr * nla,u32 objtype,u8 genmask)7386 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7387 						  const struct nlattr *nla,
7388 						  u32 objtype, u8 genmask)
7389 {
7390 	struct nft_object *obj;
7391 
7392 	list_for_each_entry(obj, &table->objects, list) {
7393 		if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7394 		    objtype == obj->ops->type->type &&
7395 		    nft_active_genmask(obj, genmask))
7396 			return obj;
7397 	}
7398 	return ERR_PTR(-ENOENT);
7399 }
7400 
7401 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7402 	[NFTA_OBJ_TABLE]	= { .type = NLA_STRING,
7403 				    .len = NFT_TABLE_MAXNAMELEN - 1 },
7404 	[NFTA_OBJ_NAME]		= { .type = NLA_STRING,
7405 				    .len = NFT_OBJ_MAXNAMELEN - 1 },
7406 	[NFTA_OBJ_TYPE]		= { .type = NLA_U32 },
7407 	[NFTA_OBJ_DATA]		= { .type = NLA_NESTED },
7408 	[NFTA_OBJ_HANDLE]	= { .type = NLA_U64},
7409 	[NFTA_OBJ_USERDATA]	= { .type = NLA_BINARY,
7410 				    .len = NFT_USERDATA_MAXLEN },
7411 };
7412 
nft_obj_init(const struct nft_ctx * ctx,const struct nft_object_type * type,const struct nlattr * attr)7413 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7414 				       const struct nft_object_type *type,
7415 				       const struct nlattr *attr)
7416 {
7417 	struct nlattr **tb;
7418 	const struct nft_object_ops *ops;
7419 	struct nft_object *obj;
7420 	int err = -ENOMEM;
7421 
7422 	tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7423 	if (!tb)
7424 		goto err1;
7425 
7426 	if (attr) {
7427 		err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7428 						  type->policy, NULL);
7429 		if (err < 0)
7430 			goto err2;
7431 	} else {
7432 		memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7433 	}
7434 
7435 	if (type->select_ops) {
7436 		ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7437 		if (IS_ERR(ops)) {
7438 			err = PTR_ERR(ops);
7439 			goto err2;
7440 		}
7441 	} else {
7442 		ops = type->ops;
7443 	}
7444 
7445 	err = -ENOMEM;
7446 	obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7447 	if (!obj)
7448 		goto err2;
7449 
7450 	err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7451 	if (err < 0)
7452 		goto err3;
7453 
7454 	obj->ops = ops;
7455 
7456 	kfree(tb);
7457 	return obj;
7458 err3:
7459 	kfree(obj);
7460 err2:
7461 	kfree(tb);
7462 err1:
7463 	return ERR_PTR(err);
7464 }
7465 
nft_object_dump(struct sk_buff * skb,unsigned int attr,struct nft_object * obj,bool reset)7466 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7467 			   struct nft_object *obj, bool reset)
7468 {
7469 	struct nlattr *nest;
7470 
7471 	nest = nla_nest_start_noflag(skb, attr);
7472 	if (!nest)
7473 		goto nla_put_failure;
7474 	if (obj->ops->dump(skb, obj, reset) < 0)
7475 		goto nla_put_failure;
7476 	nla_nest_end(skb, nest);
7477 	return 0;
7478 
7479 nla_put_failure:
7480 	return -1;
7481 }
7482 
__nft_obj_type_get(u32 objtype,u8 family)7483 static const struct nft_object_type *__nft_obj_type_get(u32 objtype, u8 family)
7484 {
7485 	const struct nft_object_type *type;
7486 
7487 	list_for_each_entry_rcu(type, &nf_tables_objects, list) {
7488 		if (type->family != NFPROTO_UNSPEC &&
7489 		    type->family != family)
7490 			continue;
7491 
7492 		if (objtype == type->type)
7493 			return type;
7494 	}
7495 	return NULL;
7496 }
7497 
7498 static const struct nft_object_type *
nft_obj_type_get(struct net * net,u32 objtype,u8 family)7499 nft_obj_type_get(struct net *net, u32 objtype, u8 family)
7500 {
7501 	const struct nft_object_type *type;
7502 
7503 	rcu_read_lock();
7504 	type = __nft_obj_type_get(objtype, family);
7505 	if (type != NULL && try_module_get(type->owner)) {
7506 		rcu_read_unlock();
7507 		return type;
7508 	}
7509 	rcu_read_unlock();
7510 
7511 	lockdep_nfnl_nft_mutex_not_held();
7512 #ifdef CONFIG_MODULES
7513 	if (type == NULL) {
7514 		if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7515 			return ERR_PTR(-EAGAIN);
7516 	}
7517 #endif
7518 	return ERR_PTR(-ENOENT);
7519 }
7520 
nf_tables_updobj(const struct nft_ctx * ctx,const struct nft_object_type * type,const struct nlattr * attr,struct nft_object * obj)7521 static int nf_tables_updobj(const struct nft_ctx *ctx,
7522 			    const struct nft_object_type *type,
7523 			    const struct nlattr *attr,
7524 			    struct nft_object *obj)
7525 {
7526 	struct nft_object *newobj;
7527 	struct nft_trans *trans;
7528 	int err = -ENOMEM;
7529 
7530 	if (!try_module_get(type->owner))
7531 		return -ENOENT;
7532 
7533 	trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7534 				sizeof(struct nft_trans_obj));
7535 	if (!trans)
7536 		goto err_trans;
7537 
7538 	newobj = nft_obj_init(ctx, type, attr);
7539 	if (IS_ERR(newobj)) {
7540 		err = PTR_ERR(newobj);
7541 		goto err_free_trans;
7542 	}
7543 
7544 	nft_trans_obj(trans) = obj;
7545 	nft_trans_obj_update(trans) = true;
7546 	nft_trans_obj_newobj(trans) = newobj;
7547 	nft_trans_commit_list_add_tail(ctx->net, trans);
7548 
7549 	return 0;
7550 
7551 err_free_trans:
7552 	kfree(trans);
7553 err_trans:
7554 	module_put(type->owner);
7555 	return err;
7556 }
7557 
nf_tables_newobj(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])7558 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7559 			    const struct nlattr * const nla[])
7560 {
7561 	struct netlink_ext_ack *extack = info->extack;
7562 	u8 genmask = nft_genmask_next(info->net);
7563 	u8 family = info->nfmsg->nfgen_family;
7564 	const struct nft_object_type *type;
7565 	struct net *net = info->net;
7566 	struct nft_table *table;
7567 	struct nft_object *obj;
7568 	struct nft_ctx ctx;
7569 	u32 objtype;
7570 	int err;
7571 
7572 	if (!nla[NFTA_OBJ_TYPE] ||
7573 	    !nla[NFTA_OBJ_NAME] ||
7574 	    !nla[NFTA_OBJ_DATA])
7575 		return -EINVAL;
7576 
7577 	table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7578 				 NETLINK_CB(skb).portid);
7579 	if (IS_ERR(table)) {
7580 		NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7581 		return PTR_ERR(table);
7582 	}
7583 
7584 	objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7585 	obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7586 	if (IS_ERR(obj)) {
7587 		err = PTR_ERR(obj);
7588 		if (err != -ENOENT) {
7589 			NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7590 			return err;
7591 		}
7592 	} else {
7593 		if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7594 			NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7595 			return -EEXIST;
7596 		}
7597 		if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7598 			return -EOPNOTSUPP;
7599 
7600 		type = __nft_obj_type_get(objtype, family);
7601 		if (WARN_ON_ONCE(!type))
7602 			return -ENOENT;
7603 
7604 		nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7605 
7606 		return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7607 	}
7608 
7609 	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7610 
7611 	if (!nft_use_inc(&table->use))
7612 		return -EMFILE;
7613 
7614 	type = nft_obj_type_get(net, objtype, family);
7615 	if (IS_ERR(type)) {
7616 		err = PTR_ERR(type);
7617 		goto err_type;
7618 	}
7619 
7620 	obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7621 	if (IS_ERR(obj)) {
7622 		err = PTR_ERR(obj);
7623 		goto err_init;
7624 	}
7625 	obj->key.table = table;
7626 	obj->handle = nf_tables_alloc_handle(table);
7627 
7628 	obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7629 	if (!obj->key.name) {
7630 		err = -ENOMEM;
7631 		goto err_strdup;
7632 	}
7633 
7634 	if (nla[NFTA_OBJ_USERDATA]) {
7635 		obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7636 		if (obj->udata == NULL)
7637 			goto err_userdata;
7638 
7639 		obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7640 	}
7641 
7642 	err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7643 	if (err < 0)
7644 		goto err_trans;
7645 
7646 	err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7647 			      nft_objname_ht_params);
7648 	if (err < 0)
7649 		goto err_obj_ht;
7650 
7651 	list_add_tail_rcu(&obj->list, &table->objects);
7652 
7653 	return 0;
7654 err_obj_ht:
7655 	/* queued in transaction log */
7656 	INIT_LIST_HEAD(&obj->list);
7657 	return err;
7658 err_trans:
7659 	kfree(obj->udata);
7660 err_userdata:
7661 	kfree(obj->key.name);
7662 err_strdup:
7663 	if (obj->ops->destroy)
7664 		obj->ops->destroy(&ctx, obj);
7665 	kfree(obj);
7666 err_init:
7667 	module_put(type->owner);
7668 err_type:
7669 	nft_use_dec_restore(&table->use);
7670 
7671 	return err;
7672 }
7673 
nf_tables_fill_obj_info(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,int event,u32 flags,int family,const struct nft_table * table,struct nft_object * obj,bool reset)7674 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7675 				   u32 portid, u32 seq, int event, u32 flags,
7676 				   int family, const struct nft_table *table,
7677 				   struct nft_object *obj, bool reset)
7678 {
7679 	struct nlmsghdr *nlh;
7680 
7681 	event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7682 	nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7683 			   NFNETLINK_V0, nft_base_seq(net));
7684 	if (!nlh)
7685 		goto nla_put_failure;
7686 
7687 	if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7688 	    nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7689 	    nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7690 			 NFTA_OBJ_PAD))
7691 		goto nla_put_failure;
7692 
7693 	if (event == NFT_MSG_DELOBJ) {
7694 		nlmsg_end(skb, nlh);
7695 		return 0;
7696 	}
7697 
7698 	if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7699 	    nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7700 	    nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7701 		goto nla_put_failure;
7702 
7703 	if (obj->udata &&
7704 	    nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7705 		goto nla_put_failure;
7706 
7707 	nlmsg_end(skb, nlh);
7708 	return 0;
7709 
7710 nla_put_failure:
7711 	nlmsg_trim(skb, nlh);
7712 	return -1;
7713 }
7714 
audit_log_obj_reset(const struct nft_table * table,unsigned int base_seq,unsigned int nentries)7715 static void audit_log_obj_reset(const struct nft_table *table,
7716 				unsigned int base_seq, unsigned int nentries)
7717 {
7718 	char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
7719 
7720 	audit_log_nfcfg(buf, table->family, nentries,
7721 			AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
7722 	kfree(buf);
7723 }
7724 
7725 struct nft_obj_dump_ctx {
7726 	unsigned int	s_idx;
7727 	char		*table;
7728 	u32		type;
7729 	bool		reset;
7730 };
7731 
nf_tables_dump_obj(struct sk_buff * skb,struct netlink_callback * cb)7732 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7733 {
7734 	const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7735 	struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7736 	struct net *net = sock_net(skb->sk);
7737 	int family = nfmsg->nfgen_family;
7738 	struct nftables_pernet *nft_net;
7739 	const struct nft_table *table;
7740 	unsigned int entries = 0;
7741 	struct nft_object *obj;
7742 	unsigned int idx = 0;
7743 	int rc = 0;
7744 
7745 	rcu_read_lock();
7746 	nft_net = nft_pernet(net);
7747 	cb->seq = READ_ONCE(nft_net->base_seq);
7748 
7749 	list_for_each_entry_rcu(table, &nft_net->tables, list) {
7750 		if (family != NFPROTO_UNSPEC && family != table->family)
7751 			continue;
7752 
7753 		entries = 0;
7754 		list_for_each_entry_rcu(obj, &table->objects, list) {
7755 			if (!nft_is_active(net, obj))
7756 				goto cont;
7757 			if (idx < ctx->s_idx)
7758 				goto cont;
7759 			if (ctx->table && strcmp(ctx->table, table->name))
7760 				goto cont;
7761 			if (ctx->type != NFT_OBJECT_UNSPEC &&
7762 			    obj->ops->type->type != ctx->type)
7763 				goto cont;
7764 
7765 			rc = nf_tables_fill_obj_info(skb, net,
7766 						     NETLINK_CB(cb->skb).portid,
7767 						     cb->nlh->nlmsg_seq,
7768 						     NFT_MSG_NEWOBJ,
7769 						     NLM_F_MULTI | NLM_F_APPEND,
7770 						     table->family, table,
7771 						     obj, ctx->reset);
7772 			if (rc < 0)
7773 				break;
7774 
7775 			entries++;
7776 			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7777 cont:
7778 			idx++;
7779 		}
7780 		if (ctx->reset && entries)
7781 			audit_log_obj_reset(table, nft_net->base_seq, entries);
7782 		if (rc < 0)
7783 			break;
7784 	}
7785 	rcu_read_unlock();
7786 
7787 	ctx->s_idx = idx;
7788 	return skb->len;
7789 }
7790 
nf_tables_dumpreset_obj(struct sk_buff * skb,struct netlink_callback * cb)7791 static int nf_tables_dumpreset_obj(struct sk_buff *skb,
7792 				   struct netlink_callback *cb)
7793 {
7794 	struct nftables_pernet *nft_net = nft_pernet(sock_net(skb->sk));
7795 	int ret;
7796 
7797 	mutex_lock(&nft_net->commit_mutex);
7798 	ret = nf_tables_dump_obj(skb, cb);
7799 	mutex_unlock(&nft_net->commit_mutex);
7800 
7801 	return ret;
7802 }
7803 
nf_tables_dump_obj_start(struct netlink_callback * cb)7804 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7805 {
7806 	struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7807 	const struct nlattr * const *nla = cb->data;
7808 
7809 	BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
7810 
7811 	if (nla[NFTA_OBJ_TABLE]) {
7812 		ctx->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7813 		if (!ctx->table)
7814 			return -ENOMEM;
7815 	}
7816 
7817 	if (nla[NFTA_OBJ_TYPE])
7818 		ctx->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7819 
7820 	return 0;
7821 }
7822 
nf_tables_dumpreset_obj_start(struct netlink_callback * cb)7823 static int nf_tables_dumpreset_obj_start(struct netlink_callback *cb)
7824 {
7825 	struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7826 
7827 	ctx->reset = true;
7828 
7829 	return nf_tables_dump_obj_start(cb);
7830 }
7831 
nf_tables_dump_obj_done(struct netlink_callback * cb)7832 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7833 {
7834 	struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7835 
7836 	kfree(ctx->table);
7837 
7838 	return 0;
7839 }
7840 
7841 /* called with rcu_read_lock held */
7842 static struct sk_buff *
nf_tables_getobj_single(u32 portid,const struct nfnl_info * info,const struct nlattr * const nla[],bool reset)7843 nf_tables_getobj_single(u32 portid, const struct nfnl_info *info,
7844 			const struct nlattr * const nla[], bool reset)
7845 {
7846 	struct netlink_ext_ack *extack = info->extack;
7847 	u8 genmask = nft_genmask_cur(info->net);
7848 	u8 family = info->nfmsg->nfgen_family;
7849 	const struct nft_table *table;
7850 	struct net *net = info->net;
7851 	struct nft_object *obj;
7852 	struct sk_buff *skb2;
7853 	u32 objtype;
7854 	int err;
7855 
7856 	if (!nla[NFTA_OBJ_NAME] ||
7857 	    !nla[NFTA_OBJ_TYPE])
7858 		return ERR_PTR(-EINVAL);
7859 
7860 	table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7861 	if (IS_ERR(table)) {
7862 		NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7863 		return ERR_CAST(table);
7864 	}
7865 
7866 	objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7867 	obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7868 	if (IS_ERR(obj)) {
7869 		NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7870 		return ERR_CAST(obj);
7871 	}
7872 
7873 	skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7874 	if (!skb2)
7875 		return ERR_PTR(-ENOMEM);
7876 
7877 	err = nf_tables_fill_obj_info(skb2, net, portid,
7878 				      info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7879 				      family, table, obj, reset);
7880 	if (err < 0) {
7881 		kfree_skb(skb2);
7882 		return ERR_PTR(err);
7883 	}
7884 
7885 	return skb2;
7886 }
7887 
nf_tables_getobj(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])7888 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7889 			    const struct nlattr * const nla[])
7890 {
7891 	u32 portid = NETLINK_CB(skb).portid;
7892 	struct sk_buff *skb2;
7893 
7894 	if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7895 		struct netlink_dump_control c = {
7896 			.start = nf_tables_dump_obj_start,
7897 			.dump = nf_tables_dump_obj,
7898 			.done = nf_tables_dump_obj_done,
7899 			.module = THIS_MODULE,
7900 			.data = (void *)nla,
7901 		};
7902 
7903 		return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7904 	}
7905 
7906 	skb2 = nf_tables_getobj_single(portid, info, nla, false);
7907 	if (IS_ERR(skb2))
7908 		return PTR_ERR(skb2);
7909 
7910 	return nfnetlink_unicast(skb2, info->net, portid);
7911 }
7912 
nf_tables_getobj_reset(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])7913 static int nf_tables_getobj_reset(struct sk_buff *skb,
7914 				  const struct nfnl_info *info,
7915 				  const struct nlattr * const nla[])
7916 {
7917 	struct nftables_pernet *nft_net = nft_pernet(info->net);
7918 	u32 portid = NETLINK_CB(skb).portid;
7919 	struct net *net = info->net;
7920 	struct sk_buff *skb2;
7921 	char *buf;
7922 
7923 	if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7924 		struct netlink_dump_control c = {
7925 			.start = nf_tables_dumpreset_obj_start,
7926 			.dump = nf_tables_dumpreset_obj,
7927 			.done = nf_tables_dump_obj_done,
7928 			.module = THIS_MODULE,
7929 			.data = (void *)nla,
7930 		};
7931 
7932 		return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7933 	}
7934 
7935 	if (!try_module_get(THIS_MODULE))
7936 		return -EINVAL;
7937 	rcu_read_unlock();
7938 	mutex_lock(&nft_net->commit_mutex);
7939 	skb2 = nf_tables_getobj_single(portid, info, nla, true);
7940 	mutex_unlock(&nft_net->commit_mutex);
7941 	rcu_read_lock();
7942 	module_put(THIS_MODULE);
7943 
7944 	if (IS_ERR(skb2))
7945 		return PTR_ERR(skb2);
7946 
7947 	buf = kasprintf(GFP_ATOMIC, "%.*s:%u",
7948 			nla_len(nla[NFTA_OBJ_TABLE]),
7949 			(char *)nla_data(nla[NFTA_OBJ_TABLE]),
7950 			nft_net->base_seq);
7951 	audit_log_nfcfg(buf, info->nfmsg->nfgen_family, 1,
7952 			AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
7953 	kfree(buf);
7954 
7955 	return nfnetlink_unicast(skb2, net, portid);
7956 }
7957 
nft_obj_destroy(const struct nft_ctx * ctx,struct nft_object * obj)7958 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7959 {
7960 	if (obj->ops->destroy)
7961 		obj->ops->destroy(ctx, obj);
7962 
7963 	module_put(obj->ops->type->owner);
7964 	kfree(obj->key.name);
7965 	kfree(obj->udata);
7966 	kfree(obj);
7967 }
7968 
nf_tables_delobj(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])7969 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7970 			    const struct nlattr * const nla[])
7971 {
7972 	struct netlink_ext_ack *extack = info->extack;
7973 	u8 genmask = nft_genmask_next(info->net);
7974 	u8 family = info->nfmsg->nfgen_family;
7975 	struct net *net = info->net;
7976 	const struct nlattr *attr;
7977 	struct nft_table *table;
7978 	struct nft_object *obj;
7979 	struct nft_ctx ctx;
7980 	u32 objtype;
7981 
7982 	if (!nla[NFTA_OBJ_TYPE] ||
7983 	    (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7984 		return -EINVAL;
7985 
7986 	table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7987 				 NETLINK_CB(skb).portid);
7988 	if (IS_ERR(table)) {
7989 		NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7990 		return PTR_ERR(table);
7991 	}
7992 
7993 	objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7994 	if (nla[NFTA_OBJ_HANDLE]) {
7995 		attr = nla[NFTA_OBJ_HANDLE];
7996 		obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7997 	} else {
7998 		attr = nla[NFTA_OBJ_NAME];
7999 		obj = nft_obj_lookup(net, table, attr, objtype, genmask);
8000 	}
8001 
8002 	if (IS_ERR(obj)) {
8003 		if (PTR_ERR(obj) == -ENOENT &&
8004 		    NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
8005 			return 0;
8006 
8007 		NL_SET_BAD_ATTR(extack, attr);
8008 		return PTR_ERR(obj);
8009 	}
8010 	if (obj->use > 0) {
8011 		NL_SET_BAD_ATTR(extack, attr);
8012 		return -EBUSY;
8013 	}
8014 
8015 	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8016 
8017 	return nft_delobj(&ctx, obj);
8018 }
8019 
8020 static void
__nft_obj_notify(struct net * net,const struct nft_table * table,struct nft_object * obj,u32 portid,u32 seq,int event,u16 flags,int family,int report,gfp_t gfp)8021 __nft_obj_notify(struct net *net, const struct nft_table *table,
8022 		 struct nft_object *obj, u32 portid, u32 seq, int event,
8023 		 u16 flags, int family, int report, gfp_t gfp)
8024 {
8025 	struct nftables_pernet *nft_net = nft_pernet(net);
8026 	struct sk_buff *skb;
8027 	int err;
8028 
8029 	if (!report &&
8030 	    !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8031 		return;
8032 
8033 	skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
8034 	if (skb == NULL)
8035 		goto err;
8036 
8037 	err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
8038 				      flags & (NLM_F_CREATE | NLM_F_EXCL),
8039 				      family, table, obj, false);
8040 	if (err < 0) {
8041 		kfree_skb(skb);
8042 		goto err;
8043 	}
8044 
8045 	nft_notify_enqueue(skb, report, &nft_net->notify_list);
8046 	return;
8047 err:
8048 	nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
8049 }
8050 
nft_obj_notify(struct net * net,const struct nft_table * table,struct nft_object * obj,u32 portid,u32 seq,int event,u16 flags,int family,int report,gfp_t gfp)8051 void nft_obj_notify(struct net *net, const struct nft_table *table,
8052 		    struct nft_object *obj, u32 portid, u32 seq, int event,
8053 		    u16 flags, int family, int report, gfp_t gfp)
8054 {
8055 	struct nftables_pernet *nft_net = nft_pernet(net);
8056 	char *buf = kasprintf(gfp, "%s:%u",
8057 			      table->name, nft_net->base_seq);
8058 
8059 	audit_log_nfcfg(buf,
8060 			family,
8061 			obj->handle,
8062 			event == NFT_MSG_NEWOBJ ?
8063 				 AUDIT_NFT_OP_OBJ_REGISTER :
8064 				 AUDIT_NFT_OP_OBJ_UNREGISTER,
8065 			gfp);
8066 	kfree(buf);
8067 
8068 	__nft_obj_notify(net, table, obj, portid, seq, event,
8069 			 flags, family, report, gfp);
8070 }
8071 EXPORT_SYMBOL_GPL(nft_obj_notify);
8072 
nf_tables_obj_notify(const struct nft_ctx * ctx,struct nft_object * obj,int event)8073 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
8074 				 struct nft_object *obj, int event)
8075 {
8076 	__nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
8077 			 ctx->seq, event, ctx->flags, ctx->family,
8078 			 ctx->report, GFP_KERNEL);
8079 }
8080 
8081 /*
8082  * Flow tables
8083  */
nft_register_flowtable_type(struct nf_flowtable_type * type)8084 void nft_register_flowtable_type(struct nf_flowtable_type *type)
8085 {
8086 	nfnl_lock(NFNL_SUBSYS_NFTABLES);
8087 	list_add_tail_rcu(&type->list, &nf_tables_flowtables);
8088 	nfnl_unlock(NFNL_SUBSYS_NFTABLES);
8089 }
8090 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
8091 
nft_unregister_flowtable_type(struct nf_flowtable_type * type)8092 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
8093 {
8094 	nfnl_lock(NFNL_SUBSYS_NFTABLES);
8095 	list_del_rcu(&type->list);
8096 	nfnl_unlock(NFNL_SUBSYS_NFTABLES);
8097 }
8098 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
8099 
8100 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
8101 	[NFTA_FLOWTABLE_TABLE]		= { .type = NLA_STRING,
8102 					    .len = NFT_NAME_MAXLEN - 1 },
8103 	[NFTA_FLOWTABLE_NAME]		= { .type = NLA_STRING,
8104 					    .len = NFT_NAME_MAXLEN - 1 },
8105 	[NFTA_FLOWTABLE_HOOK]		= { .type = NLA_NESTED },
8106 	[NFTA_FLOWTABLE_HANDLE]		= { .type = NLA_U64 },
8107 	[NFTA_FLOWTABLE_FLAGS]		= { .type = NLA_U32 },
8108 };
8109 
nft_flowtable_lookup(const struct nft_table * table,const struct nlattr * nla,u8 genmask)8110 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
8111 					   const struct nlattr *nla, u8 genmask)
8112 {
8113 	struct nft_flowtable *flowtable;
8114 
8115 	list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8116 		if (!nla_strcmp(nla, flowtable->name) &&
8117 		    nft_active_genmask(flowtable, genmask))
8118 			return flowtable;
8119 	}
8120 	return ERR_PTR(-ENOENT);
8121 }
8122 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
8123 
nf_tables_deactivate_flowtable(const struct nft_ctx * ctx,struct nft_flowtable * flowtable,enum nft_trans_phase phase)8124 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
8125 				    struct nft_flowtable *flowtable,
8126 				    enum nft_trans_phase phase)
8127 {
8128 	switch (phase) {
8129 	case NFT_TRANS_PREPARE_ERROR:
8130 	case NFT_TRANS_PREPARE:
8131 	case NFT_TRANS_ABORT:
8132 	case NFT_TRANS_RELEASE:
8133 		nft_use_dec(&flowtable->use);
8134 		fallthrough;
8135 	default:
8136 		return;
8137 	}
8138 }
8139 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
8140 
8141 static struct nft_flowtable *
nft_flowtable_lookup_byhandle(const struct nft_table * table,const struct nlattr * nla,u8 genmask)8142 nft_flowtable_lookup_byhandle(const struct nft_table *table,
8143 			      const struct nlattr *nla, u8 genmask)
8144 {
8145        struct nft_flowtable *flowtable;
8146 
8147        list_for_each_entry(flowtable, &table->flowtables, list) {
8148                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
8149                    nft_active_genmask(flowtable, genmask))
8150                        return flowtable;
8151        }
8152        return ERR_PTR(-ENOENT);
8153 }
8154 
8155 struct nft_flowtable_hook {
8156 	u32			num;
8157 	int			priority;
8158 	struct list_head	list;
8159 };
8160 
8161 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
8162 	[NFTA_FLOWTABLE_HOOK_NUM]	= { .type = NLA_U32 },
8163 	[NFTA_FLOWTABLE_HOOK_PRIORITY]	= { .type = NLA_U32 },
8164 	[NFTA_FLOWTABLE_HOOK_DEVS]	= { .type = NLA_NESTED },
8165 };
8166 
nft_flowtable_parse_hook(const struct nft_ctx * ctx,const struct nlattr * const nla[],struct nft_flowtable_hook * flowtable_hook,struct nft_flowtable * flowtable,struct netlink_ext_ack * extack,bool add)8167 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
8168 				    const struct nlattr * const nla[],
8169 				    struct nft_flowtable_hook *flowtable_hook,
8170 				    struct nft_flowtable *flowtable,
8171 				    struct netlink_ext_ack *extack, bool add)
8172 {
8173 	struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
8174 	struct nft_hook *hook;
8175 	int hooknum, priority;
8176 	int err;
8177 
8178 	INIT_LIST_HEAD(&flowtable_hook->list);
8179 
8180 	err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
8181 					  nla[NFTA_FLOWTABLE_HOOK],
8182 					  nft_flowtable_hook_policy, NULL);
8183 	if (err < 0)
8184 		return err;
8185 
8186 	if (add) {
8187 		if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
8188 		    !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8189 			NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8190 			return -ENOENT;
8191 		}
8192 
8193 		hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8194 		if (hooknum != NF_NETDEV_INGRESS)
8195 			return -EOPNOTSUPP;
8196 
8197 		priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8198 
8199 		flowtable_hook->priority	= priority;
8200 		flowtable_hook->num		= hooknum;
8201 	} else {
8202 		if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
8203 			hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8204 			if (hooknum != flowtable->hooknum)
8205 				return -EOPNOTSUPP;
8206 		}
8207 
8208 		if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8209 			priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8210 			if (priority != flowtable->data.priority)
8211 				return -EOPNOTSUPP;
8212 		}
8213 
8214 		flowtable_hook->priority	= flowtable->data.priority;
8215 		flowtable_hook->num		= flowtable->hooknum;
8216 	}
8217 
8218 	if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
8219 		err = nf_tables_parse_netdev_hooks(ctx->net,
8220 						   tb[NFTA_FLOWTABLE_HOOK_DEVS],
8221 						   &flowtable_hook->list,
8222 						   extack);
8223 		if (err < 0)
8224 			return err;
8225 	}
8226 
8227 	list_for_each_entry(hook, &flowtable_hook->list, list) {
8228 		hook->ops.pf		= NFPROTO_NETDEV;
8229 		hook->ops.hooknum	= flowtable_hook->num;
8230 		hook->ops.priority	= flowtable_hook->priority;
8231 		hook->ops.priv		= &flowtable->data;
8232 		hook->ops.hook		= flowtable->data.type->hook;
8233 	}
8234 
8235 	return err;
8236 }
8237 
8238 /* call under rcu_read_lock */
__nft_flowtable_type_get(u8 family)8239 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8240 {
8241 	const struct nf_flowtable_type *type;
8242 
8243 	list_for_each_entry_rcu(type, &nf_tables_flowtables, list) {
8244 		if (family == type->family)
8245 			return type;
8246 	}
8247 	return NULL;
8248 }
8249 
8250 static const struct nf_flowtable_type *
nft_flowtable_type_get(struct net * net,u8 family)8251 nft_flowtable_type_get(struct net *net, u8 family)
8252 {
8253 	const struct nf_flowtable_type *type;
8254 
8255 	rcu_read_lock();
8256 	type = __nft_flowtable_type_get(family);
8257 	if (type != NULL && try_module_get(type->owner)) {
8258 		rcu_read_unlock();
8259 		return type;
8260 	}
8261 	rcu_read_unlock();
8262 
8263 	lockdep_nfnl_nft_mutex_not_held();
8264 #ifdef CONFIG_MODULES
8265 	if (type == NULL) {
8266 		if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8267 			return ERR_PTR(-EAGAIN);
8268 	}
8269 #endif
8270 	return ERR_PTR(-ENOENT);
8271 }
8272 
8273 /* Only called from error and netdev event paths. */
nft_unregister_flowtable_hook(struct net * net,struct nft_flowtable * flowtable,struct nft_hook * hook)8274 static void nft_unregister_flowtable_hook(struct net *net,
8275 					  struct nft_flowtable *flowtable,
8276 					  struct nft_hook *hook)
8277 {
8278 	nf_unregister_net_hook(net, &hook->ops);
8279 	flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8280 				    FLOW_BLOCK_UNBIND);
8281 }
8282 
__nft_unregister_flowtable_net_hooks(struct net * net,struct list_head * hook_list,bool release_netdev)8283 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8284 						 struct list_head *hook_list,
8285 					         bool release_netdev)
8286 {
8287 	struct nft_hook *hook, *next;
8288 
8289 	list_for_each_entry_safe(hook, next, hook_list, list) {
8290 		nf_unregister_net_hook(net, &hook->ops);
8291 		if (release_netdev) {
8292 			list_del(&hook->list);
8293 			kfree_rcu(hook, rcu);
8294 		}
8295 	}
8296 }
8297 
nft_unregister_flowtable_net_hooks(struct net * net,struct list_head * hook_list)8298 static void nft_unregister_flowtable_net_hooks(struct net *net,
8299 					       struct list_head *hook_list)
8300 {
8301 	__nft_unregister_flowtable_net_hooks(net, hook_list, false);
8302 }
8303 
nft_register_flowtable_net_hooks(struct net * net,struct nft_table * table,struct list_head * hook_list,struct nft_flowtable * flowtable)8304 static int nft_register_flowtable_net_hooks(struct net *net,
8305 					    struct nft_table *table,
8306 					    struct list_head *hook_list,
8307 					    struct nft_flowtable *flowtable)
8308 {
8309 	struct nft_hook *hook, *hook2, *next;
8310 	struct nft_flowtable *ft;
8311 	int err, i = 0;
8312 
8313 	list_for_each_entry(hook, hook_list, list) {
8314 		list_for_each_entry(ft, &table->flowtables, list) {
8315 			if (!nft_is_active_next(net, ft))
8316 				continue;
8317 
8318 			list_for_each_entry(hook2, &ft->hook_list, list) {
8319 				if (hook->ops.dev == hook2->ops.dev &&
8320 				    hook->ops.pf == hook2->ops.pf) {
8321 					err = -EEXIST;
8322 					goto err_unregister_net_hooks;
8323 				}
8324 			}
8325 		}
8326 
8327 		err = flowtable->data.type->setup(&flowtable->data,
8328 						  hook->ops.dev,
8329 						  FLOW_BLOCK_BIND);
8330 		if (err < 0)
8331 			goto err_unregister_net_hooks;
8332 
8333 		err = nf_register_net_hook(net, &hook->ops);
8334 		if (err < 0) {
8335 			flowtable->data.type->setup(&flowtable->data,
8336 						    hook->ops.dev,
8337 						    FLOW_BLOCK_UNBIND);
8338 			goto err_unregister_net_hooks;
8339 		}
8340 
8341 		i++;
8342 	}
8343 
8344 	return 0;
8345 
8346 err_unregister_net_hooks:
8347 	list_for_each_entry_safe(hook, next, hook_list, list) {
8348 		if (i-- <= 0)
8349 			break;
8350 
8351 		nft_unregister_flowtable_hook(net, flowtable, hook);
8352 		list_del_rcu(&hook->list);
8353 		kfree_rcu(hook, rcu);
8354 	}
8355 
8356 	return err;
8357 }
8358 
nft_hooks_destroy(struct list_head * hook_list)8359 static void nft_hooks_destroy(struct list_head *hook_list)
8360 {
8361 	struct nft_hook *hook, *next;
8362 
8363 	list_for_each_entry_safe(hook, next, hook_list, list) {
8364 		list_del_rcu(&hook->list);
8365 		kfree_rcu(hook, rcu);
8366 	}
8367 }
8368 
nft_flowtable_update(struct nft_ctx * ctx,const struct nlmsghdr * nlh,struct nft_flowtable * flowtable,struct netlink_ext_ack * extack)8369 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8370 				struct nft_flowtable *flowtable,
8371 				struct netlink_ext_ack *extack)
8372 {
8373 	const struct nlattr * const *nla = ctx->nla;
8374 	struct nft_flowtable_hook flowtable_hook;
8375 	struct nft_hook *hook, *next;
8376 	struct nft_trans *trans;
8377 	bool unregister = false;
8378 	u32 flags;
8379 	int err;
8380 
8381 	err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8382 				       extack, false);
8383 	if (err < 0)
8384 		return err;
8385 
8386 	list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8387 		if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8388 			list_del(&hook->list);
8389 			kfree(hook);
8390 		}
8391 	}
8392 
8393 	if (nla[NFTA_FLOWTABLE_FLAGS]) {
8394 		flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8395 		if (flags & ~NFT_FLOWTABLE_MASK) {
8396 			err = -EOPNOTSUPP;
8397 			goto err_flowtable_update_hook;
8398 		}
8399 		if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8400 		    (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8401 			err = -EOPNOTSUPP;
8402 			goto err_flowtable_update_hook;
8403 		}
8404 	} else {
8405 		flags = flowtable->data.flags;
8406 	}
8407 
8408 	err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8409 					       &flowtable_hook.list, flowtable);
8410 	if (err < 0)
8411 		goto err_flowtable_update_hook;
8412 
8413 	trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8414 				sizeof(struct nft_trans_flowtable));
8415 	if (!trans) {
8416 		unregister = true;
8417 		err = -ENOMEM;
8418 		goto err_flowtable_update_hook;
8419 	}
8420 
8421 	nft_trans_flowtable_flags(trans) = flags;
8422 	nft_trans_flowtable(trans) = flowtable;
8423 	nft_trans_flowtable_update(trans) = true;
8424 	INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8425 	list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8426 
8427 	nft_trans_commit_list_add_tail(ctx->net, trans);
8428 
8429 	return 0;
8430 
8431 err_flowtable_update_hook:
8432 	list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8433 		if (unregister)
8434 			nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8435 		list_del_rcu(&hook->list);
8436 		kfree_rcu(hook, rcu);
8437 	}
8438 
8439 	return err;
8440 
8441 }
8442 
nf_tables_newflowtable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])8443 static int nf_tables_newflowtable(struct sk_buff *skb,
8444 				  const struct nfnl_info *info,
8445 				  const struct nlattr * const nla[])
8446 {
8447 	struct netlink_ext_ack *extack = info->extack;
8448 	struct nft_flowtable_hook flowtable_hook;
8449 	u8 genmask = nft_genmask_next(info->net);
8450 	u8 family = info->nfmsg->nfgen_family;
8451 	const struct nf_flowtable_type *type;
8452 	struct nft_flowtable *flowtable;
8453 	struct net *net = info->net;
8454 	struct nft_table *table;
8455 	struct nft_trans *trans;
8456 	struct nft_ctx ctx;
8457 	int err;
8458 
8459 	if (!nla[NFTA_FLOWTABLE_TABLE] ||
8460 	    !nla[NFTA_FLOWTABLE_NAME] ||
8461 	    !nla[NFTA_FLOWTABLE_HOOK])
8462 		return -EINVAL;
8463 
8464 	table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8465 				 genmask, NETLINK_CB(skb).portid);
8466 	if (IS_ERR(table)) {
8467 		NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8468 		return PTR_ERR(table);
8469 	}
8470 
8471 	flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8472 					 genmask);
8473 	if (IS_ERR(flowtable)) {
8474 		err = PTR_ERR(flowtable);
8475 		if (err != -ENOENT) {
8476 			NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8477 			return err;
8478 		}
8479 	} else {
8480 		if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8481 			NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8482 			return -EEXIST;
8483 		}
8484 
8485 		nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8486 
8487 		return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8488 	}
8489 
8490 	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8491 
8492 	if (!nft_use_inc(&table->use))
8493 		return -EMFILE;
8494 
8495 	flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8496 	if (!flowtable) {
8497 		err = -ENOMEM;
8498 		goto flowtable_alloc;
8499 	}
8500 
8501 	flowtable->table = table;
8502 	flowtable->handle = nf_tables_alloc_handle(table);
8503 	INIT_LIST_HEAD(&flowtable->hook_list);
8504 
8505 	flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8506 	if (!flowtable->name) {
8507 		err = -ENOMEM;
8508 		goto err1;
8509 	}
8510 
8511 	type = nft_flowtable_type_get(net, family);
8512 	if (IS_ERR(type)) {
8513 		err = PTR_ERR(type);
8514 		goto err2;
8515 	}
8516 
8517 	if (nla[NFTA_FLOWTABLE_FLAGS]) {
8518 		flowtable->data.flags =
8519 			ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8520 		if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8521 			err = -EOPNOTSUPP;
8522 			goto err3;
8523 		}
8524 	}
8525 
8526 	write_pnet(&flowtable->data.net, net);
8527 	flowtable->data.type = type;
8528 	err = type->init(&flowtable->data);
8529 	if (err < 0)
8530 		goto err3;
8531 
8532 	err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8533 				       extack, true);
8534 	if (err < 0)
8535 		goto err_flowtable_parse_hooks;
8536 
8537 	list_splice(&flowtable_hook.list, &flowtable->hook_list);
8538 	flowtable->data.priority = flowtable_hook.priority;
8539 	flowtable->hooknum = flowtable_hook.num;
8540 
8541 	trans = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8542 	if (IS_ERR(trans)) {
8543 		err = PTR_ERR(trans);
8544 		goto err_flowtable_trans;
8545 	}
8546 
8547 	/* This must be LAST to ensure no packets are walking over this flowtable. */
8548 	err = nft_register_flowtable_net_hooks(ctx.net, table,
8549 					       &flowtable->hook_list,
8550 					       flowtable);
8551 	if (err < 0)
8552 		goto err_flowtable_hooks;
8553 
8554 	list_add_tail_rcu(&flowtable->list, &table->flowtables);
8555 
8556 	return 0;
8557 
8558 err_flowtable_hooks:
8559 	nft_trans_destroy(trans);
8560 err_flowtable_trans:
8561 	nft_hooks_destroy(&flowtable->hook_list);
8562 err_flowtable_parse_hooks:
8563 	flowtable->data.type->free(&flowtable->data);
8564 err3:
8565 	module_put(type->owner);
8566 err2:
8567 	kfree(flowtable->name);
8568 err1:
8569 	kfree(flowtable);
8570 flowtable_alloc:
8571 	nft_use_dec_restore(&table->use);
8572 
8573 	return err;
8574 }
8575 
nft_flowtable_hook_release(struct nft_flowtable_hook * flowtable_hook)8576 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8577 {
8578 	struct nft_hook *this, *next;
8579 
8580 	list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8581 		list_del(&this->list);
8582 		kfree(this);
8583 	}
8584 }
8585 
nft_delflowtable_hook(struct nft_ctx * ctx,struct nft_flowtable * flowtable,struct netlink_ext_ack * extack)8586 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8587 				 struct nft_flowtable *flowtable,
8588 				 struct netlink_ext_ack *extack)
8589 {
8590 	const struct nlattr * const *nla = ctx->nla;
8591 	struct nft_flowtable_hook flowtable_hook;
8592 	LIST_HEAD(flowtable_del_list);
8593 	struct nft_hook *this, *hook;
8594 	struct nft_trans *trans;
8595 	int err;
8596 
8597 	err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8598 				       extack, false);
8599 	if (err < 0)
8600 		return err;
8601 
8602 	list_for_each_entry(this, &flowtable_hook.list, list) {
8603 		hook = nft_hook_list_find(&flowtable->hook_list, this);
8604 		if (!hook) {
8605 			err = -ENOENT;
8606 			goto err_flowtable_del_hook;
8607 		}
8608 		list_move(&hook->list, &flowtable_del_list);
8609 	}
8610 
8611 	trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8612 				sizeof(struct nft_trans_flowtable));
8613 	if (!trans) {
8614 		err = -ENOMEM;
8615 		goto err_flowtable_del_hook;
8616 	}
8617 
8618 	nft_trans_flowtable(trans) = flowtable;
8619 	nft_trans_flowtable_update(trans) = true;
8620 	INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8621 	list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8622 	nft_flowtable_hook_release(&flowtable_hook);
8623 
8624 	nft_trans_commit_list_add_tail(ctx->net, trans);
8625 
8626 	return 0;
8627 
8628 err_flowtable_del_hook:
8629 	list_splice(&flowtable_del_list, &flowtable->hook_list);
8630 	nft_flowtable_hook_release(&flowtable_hook);
8631 
8632 	return err;
8633 }
8634 
nf_tables_delflowtable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])8635 static int nf_tables_delflowtable(struct sk_buff *skb,
8636 				  const struct nfnl_info *info,
8637 				  const struct nlattr * const nla[])
8638 {
8639 	struct netlink_ext_ack *extack = info->extack;
8640 	u8 genmask = nft_genmask_next(info->net);
8641 	u8 family = info->nfmsg->nfgen_family;
8642 	struct nft_flowtable *flowtable;
8643 	struct net *net = info->net;
8644 	const struct nlattr *attr;
8645 	struct nft_table *table;
8646 	struct nft_ctx ctx;
8647 
8648 	if (!nla[NFTA_FLOWTABLE_TABLE] ||
8649 	    (!nla[NFTA_FLOWTABLE_NAME] &&
8650 	     !nla[NFTA_FLOWTABLE_HANDLE]))
8651 		return -EINVAL;
8652 
8653 	table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8654 				 genmask, NETLINK_CB(skb).portid);
8655 	if (IS_ERR(table)) {
8656 		NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8657 		return PTR_ERR(table);
8658 	}
8659 
8660 	if (nla[NFTA_FLOWTABLE_HANDLE]) {
8661 		attr = nla[NFTA_FLOWTABLE_HANDLE];
8662 		flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8663 	} else {
8664 		attr = nla[NFTA_FLOWTABLE_NAME];
8665 		flowtable = nft_flowtable_lookup(table, attr, genmask);
8666 	}
8667 
8668 	if (IS_ERR(flowtable)) {
8669 		if (PTR_ERR(flowtable) == -ENOENT &&
8670 		    NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8671 			return 0;
8672 
8673 		NL_SET_BAD_ATTR(extack, attr);
8674 		return PTR_ERR(flowtable);
8675 	}
8676 
8677 	nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8678 
8679 	if (nla[NFTA_FLOWTABLE_HOOK])
8680 		return nft_delflowtable_hook(&ctx, flowtable, extack);
8681 
8682 	if (flowtable->use > 0) {
8683 		NL_SET_BAD_ATTR(extack, attr);
8684 		return -EBUSY;
8685 	}
8686 
8687 	return nft_delflowtable(&ctx, flowtable);
8688 }
8689 
nf_tables_fill_flowtable_info(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,int event,u32 flags,int family,struct nft_flowtable * flowtable,struct list_head * hook_list)8690 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8691 					 u32 portid, u32 seq, int event,
8692 					 u32 flags, int family,
8693 					 struct nft_flowtable *flowtable,
8694 					 struct list_head *hook_list)
8695 {
8696 	struct nlattr *nest, *nest_devs;
8697 	struct nft_hook *hook;
8698 	struct nlmsghdr *nlh;
8699 
8700 	event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8701 	nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8702 			   NFNETLINK_V0, nft_base_seq(net));
8703 	if (!nlh)
8704 		goto nla_put_failure;
8705 
8706 	if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8707 	    nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8708 	    nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8709 			 NFTA_FLOWTABLE_PAD))
8710 		goto nla_put_failure;
8711 
8712 	if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8713 		nlmsg_end(skb, nlh);
8714 		return 0;
8715 	}
8716 
8717 	if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8718 	    nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8719 		goto nla_put_failure;
8720 
8721 	nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8722 	if (!nest)
8723 		goto nla_put_failure;
8724 	if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8725 	    nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8726 		goto nla_put_failure;
8727 
8728 	nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8729 	if (!nest_devs)
8730 		goto nla_put_failure;
8731 
8732 	if (!hook_list)
8733 		hook_list = &flowtable->hook_list;
8734 
8735 	list_for_each_entry_rcu(hook, hook_list, list) {
8736 		if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8737 			goto nla_put_failure;
8738 	}
8739 	nla_nest_end(skb, nest_devs);
8740 	nla_nest_end(skb, nest);
8741 
8742 	nlmsg_end(skb, nlh);
8743 	return 0;
8744 
8745 nla_put_failure:
8746 	nlmsg_trim(skb, nlh);
8747 	return -1;
8748 }
8749 
8750 struct nft_flowtable_filter {
8751 	char		*table;
8752 };
8753 
nf_tables_dump_flowtable(struct sk_buff * skb,struct netlink_callback * cb)8754 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8755 				    struct netlink_callback *cb)
8756 {
8757 	const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8758 	struct nft_flowtable_filter *filter = cb->data;
8759 	unsigned int idx = 0, s_idx = cb->args[0];
8760 	struct net *net = sock_net(skb->sk);
8761 	int family = nfmsg->nfgen_family;
8762 	struct nft_flowtable *flowtable;
8763 	struct nftables_pernet *nft_net;
8764 	const struct nft_table *table;
8765 
8766 	rcu_read_lock();
8767 	nft_net = nft_pernet(net);
8768 	cb->seq = READ_ONCE(nft_net->base_seq);
8769 
8770 	list_for_each_entry_rcu(table, &nft_net->tables, list) {
8771 		if (family != NFPROTO_UNSPEC && family != table->family)
8772 			continue;
8773 
8774 		list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8775 			if (!nft_is_active(net, flowtable))
8776 				goto cont;
8777 			if (idx < s_idx)
8778 				goto cont;
8779 			if (idx > s_idx)
8780 				memset(&cb->args[1], 0,
8781 				       sizeof(cb->args) - sizeof(cb->args[0]));
8782 			if (filter && filter->table &&
8783 			    strcmp(filter->table, table->name))
8784 				goto cont;
8785 
8786 			if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8787 							  cb->nlh->nlmsg_seq,
8788 							  NFT_MSG_NEWFLOWTABLE,
8789 							  NLM_F_MULTI | NLM_F_APPEND,
8790 							  table->family,
8791 							  flowtable, NULL) < 0)
8792 				goto done;
8793 
8794 			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8795 cont:
8796 			idx++;
8797 		}
8798 	}
8799 done:
8800 	rcu_read_unlock();
8801 
8802 	cb->args[0] = idx;
8803 	return skb->len;
8804 }
8805 
nf_tables_dump_flowtable_start(struct netlink_callback * cb)8806 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8807 {
8808 	const struct nlattr * const *nla = cb->data;
8809 	struct nft_flowtable_filter *filter = NULL;
8810 
8811 	if (nla[NFTA_FLOWTABLE_TABLE]) {
8812 		filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8813 		if (!filter)
8814 			return -ENOMEM;
8815 
8816 		filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8817 					   GFP_ATOMIC);
8818 		if (!filter->table) {
8819 			kfree(filter);
8820 			return -ENOMEM;
8821 		}
8822 	}
8823 
8824 	cb->data = filter;
8825 	return 0;
8826 }
8827 
nf_tables_dump_flowtable_done(struct netlink_callback * cb)8828 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8829 {
8830 	struct nft_flowtable_filter *filter = cb->data;
8831 
8832 	if (!filter)
8833 		return 0;
8834 
8835 	kfree(filter->table);
8836 	kfree(filter);
8837 
8838 	return 0;
8839 }
8840 
8841 /* called with rcu_read_lock held */
nf_tables_getflowtable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])8842 static int nf_tables_getflowtable(struct sk_buff *skb,
8843 				  const struct nfnl_info *info,
8844 				  const struct nlattr * const nla[])
8845 {
8846 	u8 genmask = nft_genmask_cur(info->net);
8847 	u8 family = info->nfmsg->nfgen_family;
8848 	struct nft_flowtable *flowtable;
8849 	const struct nft_table *table;
8850 	struct net *net = info->net;
8851 	struct sk_buff *skb2;
8852 	int err;
8853 
8854 	if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8855 		struct netlink_dump_control c = {
8856 			.start = nf_tables_dump_flowtable_start,
8857 			.dump = nf_tables_dump_flowtable,
8858 			.done = nf_tables_dump_flowtable_done,
8859 			.module = THIS_MODULE,
8860 			.data = (void *)nla,
8861 		};
8862 
8863 		return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8864 	}
8865 
8866 	if (!nla[NFTA_FLOWTABLE_NAME])
8867 		return -EINVAL;
8868 
8869 	table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8870 				 genmask, 0);
8871 	if (IS_ERR(table))
8872 		return PTR_ERR(table);
8873 
8874 	flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8875 					 genmask);
8876 	if (IS_ERR(flowtable))
8877 		return PTR_ERR(flowtable);
8878 
8879 	skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8880 	if (!skb2)
8881 		return -ENOMEM;
8882 
8883 	err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8884 					    info->nlh->nlmsg_seq,
8885 					    NFT_MSG_NEWFLOWTABLE, 0, family,
8886 					    flowtable, NULL);
8887 	if (err < 0)
8888 		goto err_fill_flowtable_info;
8889 
8890 	return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8891 
8892 err_fill_flowtable_info:
8893 	kfree_skb(skb2);
8894 	return err;
8895 }
8896 
nf_tables_flowtable_notify(struct nft_ctx * ctx,struct nft_flowtable * flowtable,struct list_head * hook_list,int event)8897 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8898 				       struct nft_flowtable *flowtable,
8899 				       struct list_head *hook_list, int event)
8900 {
8901 	struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8902 	struct sk_buff *skb;
8903 	u16 flags = 0;
8904 	int err;
8905 
8906 	if (!ctx->report &&
8907 	    !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8908 		return;
8909 
8910 	skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8911 	if (skb == NULL)
8912 		goto err;
8913 
8914 	if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8915 		flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8916 
8917 	err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8918 					    ctx->seq, event, flags,
8919 					    ctx->family, flowtable, hook_list);
8920 	if (err < 0) {
8921 		kfree_skb(skb);
8922 		goto err;
8923 	}
8924 
8925 	nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8926 	return;
8927 err:
8928 	nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8929 }
8930 
nf_tables_flowtable_destroy(struct nft_flowtable * flowtable)8931 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8932 {
8933 	struct nft_hook *hook, *next;
8934 
8935 	flowtable->data.type->free(&flowtable->data);
8936 	list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8937 		flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8938 					    FLOW_BLOCK_UNBIND);
8939 		list_del_rcu(&hook->list);
8940 		kfree(hook);
8941 	}
8942 	kfree(flowtable->name);
8943 	module_put(flowtable->data.type->owner);
8944 	kfree(flowtable);
8945 }
8946 
nf_tables_fill_gen_info(struct sk_buff * skb,struct net * net,u32 portid,u32 seq)8947 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8948 				   u32 portid, u32 seq)
8949 {
8950 	struct nftables_pernet *nft_net = nft_pernet(net);
8951 	struct nlmsghdr *nlh;
8952 	char buf[TASK_COMM_LEN];
8953 	int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8954 
8955 	nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8956 			   NFNETLINK_V0, nft_base_seq(net));
8957 	if (!nlh)
8958 		goto nla_put_failure;
8959 
8960 	if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8961 	    nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8962 	    nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8963 		goto nla_put_failure;
8964 
8965 	nlmsg_end(skb, nlh);
8966 	return 0;
8967 
8968 nla_put_failure:
8969 	nlmsg_trim(skb, nlh);
8970 	return -EMSGSIZE;
8971 }
8972 
nft_flowtable_event(unsigned long event,struct net_device * dev,struct nft_flowtable * flowtable)8973 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8974 				struct nft_flowtable *flowtable)
8975 {
8976 	struct nft_hook *hook;
8977 
8978 	list_for_each_entry(hook, &flowtable->hook_list, list) {
8979 		if (hook->ops.dev != dev)
8980 			continue;
8981 
8982 		/* flow_offload_netdev_event() cleans up entries for us. */
8983 		nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8984 		list_del_rcu(&hook->list);
8985 		kfree_rcu(hook, rcu);
8986 		break;
8987 	}
8988 }
8989 
nf_tables_flowtable_event(struct notifier_block * this,unsigned long event,void * ptr)8990 static int nf_tables_flowtable_event(struct notifier_block *this,
8991 				     unsigned long event, void *ptr)
8992 {
8993 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8994 	struct nft_flowtable *flowtable;
8995 	struct nftables_pernet *nft_net;
8996 	struct nft_table *table;
8997 	struct net *net;
8998 
8999 	if (event != NETDEV_UNREGISTER)
9000 		return 0;
9001 
9002 	net = dev_net(dev);
9003 	nft_net = nft_pernet(net);
9004 	mutex_lock(&nft_net->commit_mutex);
9005 	list_for_each_entry(table, &nft_net->tables, list) {
9006 		list_for_each_entry(flowtable, &table->flowtables, list) {
9007 			nft_flowtable_event(event, dev, flowtable);
9008 		}
9009 	}
9010 	mutex_unlock(&nft_net->commit_mutex);
9011 
9012 	return NOTIFY_DONE;
9013 }
9014 
9015 static struct notifier_block nf_tables_flowtable_notifier = {
9016 	.notifier_call	= nf_tables_flowtable_event,
9017 };
9018 
nf_tables_gen_notify(struct net * net,struct sk_buff * skb,int event)9019 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
9020 				 int event)
9021 {
9022 	struct nlmsghdr *nlh = nlmsg_hdr(skb);
9023 	struct sk_buff *skb2;
9024 	int err;
9025 
9026 	if (!nlmsg_report(nlh) &&
9027 	    !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
9028 		return;
9029 
9030 	skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
9031 	if (skb2 == NULL)
9032 		goto err;
9033 
9034 	err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
9035 				      nlh->nlmsg_seq);
9036 	if (err < 0) {
9037 		kfree_skb(skb2);
9038 		goto err;
9039 	}
9040 
9041 	nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
9042 		       nlmsg_report(nlh), GFP_KERNEL);
9043 	return;
9044 err:
9045 	nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
9046 			  -ENOBUFS);
9047 }
9048 
nf_tables_getgen(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])9049 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
9050 			    const struct nlattr * const nla[])
9051 {
9052 	struct sk_buff *skb2;
9053 	int err;
9054 
9055 	skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
9056 	if (skb2 == NULL)
9057 		return -ENOMEM;
9058 
9059 	err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
9060 				      info->nlh->nlmsg_seq);
9061 	if (err < 0)
9062 		goto err_fill_gen_info;
9063 
9064 	return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
9065 
9066 err_fill_gen_info:
9067 	kfree_skb(skb2);
9068 	return err;
9069 }
9070 
9071 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
9072 	[NFT_MSG_NEWTABLE] = {
9073 		.call		= nf_tables_newtable,
9074 		.type		= NFNL_CB_BATCH,
9075 		.attr_count	= NFTA_TABLE_MAX,
9076 		.policy		= nft_table_policy,
9077 	},
9078 	[NFT_MSG_GETTABLE] = {
9079 		.call		= nf_tables_gettable,
9080 		.type		= NFNL_CB_RCU,
9081 		.attr_count	= NFTA_TABLE_MAX,
9082 		.policy		= nft_table_policy,
9083 	},
9084 	[NFT_MSG_DELTABLE] = {
9085 		.call		= nf_tables_deltable,
9086 		.type		= NFNL_CB_BATCH,
9087 		.attr_count	= NFTA_TABLE_MAX,
9088 		.policy		= nft_table_policy,
9089 	},
9090 	[NFT_MSG_DESTROYTABLE] = {
9091 		.call		= nf_tables_deltable,
9092 		.type		= NFNL_CB_BATCH,
9093 		.attr_count	= NFTA_TABLE_MAX,
9094 		.policy		= nft_table_policy,
9095 	},
9096 	[NFT_MSG_NEWCHAIN] = {
9097 		.call		= nf_tables_newchain,
9098 		.type		= NFNL_CB_BATCH,
9099 		.attr_count	= NFTA_CHAIN_MAX,
9100 		.policy		= nft_chain_policy,
9101 	},
9102 	[NFT_MSG_GETCHAIN] = {
9103 		.call		= nf_tables_getchain,
9104 		.type		= NFNL_CB_RCU,
9105 		.attr_count	= NFTA_CHAIN_MAX,
9106 		.policy		= nft_chain_policy,
9107 	},
9108 	[NFT_MSG_DELCHAIN] = {
9109 		.call		= nf_tables_delchain,
9110 		.type		= NFNL_CB_BATCH,
9111 		.attr_count	= NFTA_CHAIN_MAX,
9112 		.policy		= nft_chain_policy,
9113 	},
9114 	[NFT_MSG_DESTROYCHAIN] = {
9115 		.call		= nf_tables_delchain,
9116 		.type		= NFNL_CB_BATCH,
9117 		.attr_count	= NFTA_CHAIN_MAX,
9118 		.policy		= nft_chain_policy,
9119 	},
9120 	[NFT_MSG_NEWRULE] = {
9121 		.call		= nf_tables_newrule,
9122 		.type		= NFNL_CB_BATCH,
9123 		.attr_count	= NFTA_RULE_MAX,
9124 		.policy		= nft_rule_policy,
9125 	},
9126 	[NFT_MSG_GETRULE] = {
9127 		.call		= nf_tables_getrule,
9128 		.type		= NFNL_CB_RCU,
9129 		.attr_count	= NFTA_RULE_MAX,
9130 		.policy		= nft_rule_policy,
9131 	},
9132 	[NFT_MSG_GETRULE_RESET] = {
9133 		.call		= nf_tables_getrule,
9134 		.type		= NFNL_CB_RCU,
9135 		.attr_count	= NFTA_RULE_MAX,
9136 		.policy		= nft_rule_policy,
9137 	},
9138 	[NFT_MSG_DELRULE] = {
9139 		.call		= nf_tables_delrule,
9140 		.type		= NFNL_CB_BATCH,
9141 		.attr_count	= NFTA_RULE_MAX,
9142 		.policy		= nft_rule_policy,
9143 	},
9144 	[NFT_MSG_DESTROYRULE] = {
9145 		.call		= nf_tables_delrule,
9146 		.type		= NFNL_CB_BATCH,
9147 		.attr_count	= NFTA_RULE_MAX,
9148 		.policy		= nft_rule_policy,
9149 	},
9150 	[NFT_MSG_NEWSET] = {
9151 		.call		= nf_tables_newset,
9152 		.type		= NFNL_CB_BATCH,
9153 		.attr_count	= NFTA_SET_MAX,
9154 		.policy		= nft_set_policy,
9155 	},
9156 	[NFT_MSG_GETSET] = {
9157 		.call		= nf_tables_getset,
9158 		.type		= NFNL_CB_RCU,
9159 		.attr_count	= NFTA_SET_MAX,
9160 		.policy		= nft_set_policy,
9161 	},
9162 	[NFT_MSG_DELSET] = {
9163 		.call		= nf_tables_delset,
9164 		.type		= NFNL_CB_BATCH,
9165 		.attr_count	= NFTA_SET_MAX,
9166 		.policy		= nft_set_policy,
9167 	},
9168 	[NFT_MSG_DESTROYSET] = {
9169 		.call		= nf_tables_delset,
9170 		.type		= NFNL_CB_BATCH,
9171 		.attr_count	= NFTA_SET_MAX,
9172 		.policy		= nft_set_policy,
9173 	},
9174 	[NFT_MSG_NEWSETELEM] = {
9175 		.call		= nf_tables_newsetelem,
9176 		.type		= NFNL_CB_BATCH,
9177 		.attr_count	= NFTA_SET_ELEM_LIST_MAX,
9178 		.policy		= nft_set_elem_list_policy,
9179 	},
9180 	[NFT_MSG_GETSETELEM] = {
9181 		.call		= nf_tables_getsetelem,
9182 		.type		= NFNL_CB_RCU,
9183 		.attr_count	= NFTA_SET_ELEM_LIST_MAX,
9184 		.policy		= nft_set_elem_list_policy,
9185 	},
9186 	[NFT_MSG_GETSETELEM_RESET] = {
9187 		.call		= nf_tables_getsetelem,
9188 		.type		= NFNL_CB_RCU,
9189 		.attr_count	= NFTA_SET_ELEM_LIST_MAX,
9190 		.policy		= nft_set_elem_list_policy,
9191 	},
9192 	[NFT_MSG_DELSETELEM] = {
9193 		.call		= nf_tables_delsetelem,
9194 		.type		= NFNL_CB_BATCH,
9195 		.attr_count	= NFTA_SET_ELEM_LIST_MAX,
9196 		.policy		= nft_set_elem_list_policy,
9197 	},
9198 	[NFT_MSG_DESTROYSETELEM] = {
9199 		.call		= nf_tables_delsetelem,
9200 		.type		= NFNL_CB_BATCH,
9201 		.attr_count	= NFTA_SET_ELEM_LIST_MAX,
9202 		.policy		= nft_set_elem_list_policy,
9203 	},
9204 	[NFT_MSG_GETGEN] = {
9205 		.call		= nf_tables_getgen,
9206 		.type		= NFNL_CB_RCU,
9207 	},
9208 	[NFT_MSG_NEWOBJ] = {
9209 		.call		= nf_tables_newobj,
9210 		.type		= NFNL_CB_BATCH,
9211 		.attr_count	= NFTA_OBJ_MAX,
9212 		.policy		= nft_obj_policy,
9213 	},
9214 	[NFT_MSG_GETOBJ] = {
9215 		.call		= nf_tables_getobj,
9216 		.type		= NFNL_CB_RCU,
9217 		.attr_count	= NFTA_OBJ_MAX,
9218 		.policy		= nft_obj_policy,
9219 	},
9220 	[NFT_MSG_DELOBJ] = {
9221 		.call		= nf_tables_delobj,
9222 		.type		= NFNL_CB_BATCH,
9223 		.attr_count	= NFTA_OBJ_MAX,
9224 		.policy		= nft_obj_policy,
9225 	},
9226 	[NFT_MSG_DESTROYOBJ] = {
9227 		.call		= nf_tables_delobj,
9228 		.type		= NFNL_CB_BATCH,
9229 		.attr_count	= NFTA_OBJ_MAX,
9230 		.policy		= nft_obj_policy,
9231 	},
9232 	[NFT_MSG_GETOBJ_RESET] = {
9233 		.call		= nf_tables_getobj_reset,
9234 		.type		= NFNL_CB_RCU,
9235 		.attr_count	= NFTA_OBJ_MAX,
9236 		.policy		= nft_obj_policy,
9237 	},
9238 	[NFT_MSG_NEWFLOWTABLE] = {
9239 		.call		= nf_tables_newflowtable,
9240 		.type		= NFNL_CB_BATCH,
9241 		.attr_count	= NFTA_FLOWTABLE_MAX,
9242 		.policy		= nft_flowtable_policy,
9243 	},
9244 	[NFT_MSG_GETFLOWTABLE] = {
9245 		.call		= nf_tables_getflowtable,
9246 		.type		= NFNL_CB_RCU,
9247 		.attr_count	= NFTA_FLOWTABLE_MAX,
9248 		.policy		= nft_flowtable_policy,
9249 	},
9250 	[NFT_MSG_DELFLOWTABLE] = {
9251 		.call		= nf_tables_delflowtable,
9252 		.type		= NFNL_CB_BATCH,
9253 		.attr_count	= NFTA_FLOWTABLE_MAX,
9254 		.policy		= nft_flowtable_policy,
9255 	},
9256 	[NFT_MSG_DESTROYFLOWTABLE] = {
9257 		.call		= nf_tables_delflowtable,
9258 		.type		= NFNL_CB_BATCH,
9259 		.attr_count	= NFTA_FLOWTABLE_MAX,
9260 		.policy		= nft_flowtable_policy,
9261 	},
9262 };
9263 
nf_tables_validate(struct net * net)9264 static int nf_tables_validate(struct net *net)
9265 {
9266 	struct nftables_pernet *nft_net = nft_pernet(net);
9267 	struct nft_table *table;
9268 
9269 	list_for_each_entry(table, &nft_net->tables, list) {
9270 		switch (table->validate_state) {
9271 		case NFT_VALIDATE_SKIP:
9272 			continue;
9273 		case NFT_VALIDATE_NEED:
9274 			nft_validate_state_update(table, NFT_VALIDATE_DO);
9275 			fallthrough;
9276 		case NFT_VALIDATE_DO:
9277 			if (nft_table_validate(net, table) < 0)
9278 				return -EAGAIN;
9279 
9280 			nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9281 			break;
9282 		}
9283 	}
9284 
9285 	return 0;
9286 }
9287 
9288 /* a drop policy has to be deferred until all rules have been activated,
9289  * otherwise a large ruleset that contains a drop-policy base chain will
9290  * cause all packets to get dropped until the full transaction has been
9291  * processed.
9292  *
9293  * We defer the drop policy until the transaction has been finalized.
9294  */
nft_chain_commit_drop_policy(struct nft_trans * trans)9295 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9296 {
9297 	struct nft_base_chain *basechain;
9298 
9299 	if (nft_trans_chain_policy(trans) != NF_DROP)
9300 		return;
9301 
9302 	if (!nft_is_base_chain(trans->ctx.chain))
9303 		return;
9304 
9305 	basechain = nft_base_chain(trans->ctx.chain);
9306 	basechain->policy = NF_DROP;
9307 }
9308 
nft_chain_commit_update(struct nft_trans * trans)9309 static void nft_chain_commit_update(struct nft_trans *trans)
9310 {
9311 	struct nft_base_chain *basechain;
9312 
9313 	if (nft_trans_chain_name(trans)) {
9314 		rhltable_remove(&trans->ctx.table->chains_ht,
9315 				&trans->ctx.chain->rhlhead,
9316 				nft_chain_ht_params);
9317 		swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9318 		rhltable_insert_key(&trans->ctx.table->chains_ht,
9319 				    trans->ctx.chain->name,
9320 				    &trans->ctx.chain->rhlhead,
9321 				    nft_chain_ht_params);
9322 	}
9323 
9324 	if (!nft_is_base_chain(trans->ctx.chain))
9325 		return;
9326 
9327 	nft_chain_stats_replace(trans);
9328 
9329 	basechain = nft_base_chain(trans->ctx.chain);
9330 
9331 	switch (nft_trans_chain_policy(trans)) {
9332 	case NF_DROP:
9333 	case NF_ACCEPT:
9334 		basechain->policy = nft_trans_chain_policy(trans);
9335 		break;
9336 	}
9337 }
9338 
nft_obj_commit_update(struct nft_trans * trans)9339 static void nft_obj_commit_update(struct nft_trans *trans)
9340 {
9341 	struct nft_object *newobj;
9342 	struct nft_object *obj;
9343 
9344 	obj = nft_trans_obj(trans);
9345 	newobj = nft_trans_obj_newobj(trans);
9346 
9347 	if (obj->ops->update)
9348 		obj->ops->update(obj, newobj);
9349 
9350 	nft_obj_destroy(&trans->ctx, newobj);
9351 }
9352 
nft_commit_release(struct nft_trans * trans)9353 static void nft_commit_release(struct nft_trans *trans)
9354 {
9355 	switch (trans->msg_type) {
9356 	case NFT_MSG_DELTABLE:
9357 	case NFT_MSG_DESTROYTABLE:
9358 		nf_tables_table_destroy(&trans->ctx);
9359 		break;
9360 	case NFT_MSG_NEWCHAIN:
9361 		free_percpu(nft_trans_chain_stats(trans));
9362 		kfree(nft_trans_chain_name(trans));
9363 		break;
9364 	case NFT_MSG_DELCHAIN:
9365 	case NFT_MSG_DESTROYCHAIN:
9366 		if (nft_trans_chain_update(trans))
9367 			nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9368 		else
9369 			nf_tables_chain_destroy(&trans->ctx);
9370 		break;
9371 	case NFT_MSG_DELRULE:
9372 	case NFT_MSG_DESTROYRULE:
9373 		nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9374 		break;
9375 	case NFT_MSG_DELSET:
9376 	case NFT_MSG_DESTROYSET:
9377 		nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9378 		break;
9379 	case NFT_MSG_DELSETELEM:
9380 	case NFT_MSG_DESTROYSETELEM:
9381 		nf_tables_set_elem_destroy(&trans->ctx,
9382 					   nft_trans_elem_set(trans),
9383 					   nft_trans_elem(trans).priv);
9384 		break;
9385 	case NFT_MSG_DELOBJ:
9386 	case NFT_MSG_DESTROYOBJ:
9387 		nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9388 		break;
9389 	case NFT_MSG_DELFLOWTABLE:
9390 	case NFT_MSG_DESTROYFLOWTABLE:
9391 		if (nft_trans_flowtable_update(trans))
9392 			nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9393 		else
9394 			nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9395 		break;
9396 	}
9397 
9398 	if (trans->put_net)
9399 		put_net(trans->ctx.net);
9400 
9401 	kfree(trans);
9402 }
9403 
nf_tables_trans_destroy_work(struct work_struct * w)9404 static void nf_tables_trans_destroy_work(struct work_struct *w)
9405 {
9406 	struct nft_trans *trans, *next;
9407 	LIST_HEAD(head);
9408 
9409 	spin_lock(&nf_tables_destroy_list_lock);
9410 	list_splice_init(&nf_tables_destroy_list, &head);
9411 	spin_unlock(&nf_tables_destroy_list_lock);
9412 
9413 	if (list_empty(&head))
9414 		return;
9415 
9416 	synchronize_rcu();
9417 
9418 	list_for_each_entry_safe(trans, next, &head, list) {
9419 		nft_trans_list_del(trans);
9420 		nft_commit_release(trans);
9421 	}
9422 }
9423 
nf_tables_trans_destroy_flush_work(void)9424 void nf_tables_trans_destroy_flush_work(void)
9425 {
9426 	flush_work(&trans_destroy_work);
9427 }
9428 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9429 
nft_expr_reduce(struct nft_regs_track * track,const struct nft_expr * expr)9430 static bool nft_expr_reduce(struct nft_regs_track *track,
9431 			    const struct nft_expr *expr)
9432 {
9433 	return false;
9434 }
9435 
nf_tables_commit_chain_prepare(struct net * net,struct nft_chain * chain)9436 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9437 {
9438 	const struct nft_expr *expr, *last;
9439 	struct nft_regs_track track = {};
9440 	unsigned int size, data_size;
9441 	void *data, *data_boundary;
9442 	struct nft_rule_dp *prule;
9443 	struct nft_rule *rule;
9444 
9445 	/* already handled or inactive chain? */
9446 	if (chain->blob_next || !nft_is_active_next(net, chain))
9447 		return 0;
9448 
9449 	data_size = 0;
9450 	list_for_each_entry(rule, &chain->rules, list) {
9451 		if (nft_is_active_next(net, rule)) {
9452 			data_size += sizeof(*prule) + rule->dlen;
9453 			if (data_size > INT_MAX)
9454 				return -ENOMEM;
9455 		}
9456 	}
9457 
9458 	chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9459 	if (!chain->blob_next)
9460 		return -ENOMEM;
9461 
9462 	data = (void *)chain->blob_next->data;
9463 	data_boundary = data + data_size;
9464 	size = 0;
9465 
9466 	list_for_each_entry(rule, &chain->rules, list) {
9467 		if (!nft_is_active_next(net, rule))
9468 			continue;
9469 
9470 		prule = (struct nft_rule_dp *)data;
9471 		data += offsetof(struct nft_rule_dp, data);
9472 		if (WARN_ON_ONCE(data > data_boundary))
9473 			return -ENOMEM;
9474 
9475 		size = 0;
9476 		track.last = nft_expr_last(rule);
9477 		nft_rule_for_each_expr(expr, last, rule) {
9478 			track.cur = expr;
9479 
9480 			if (nft_expr_reduce(&track, expr)) {
9481 				expr = track.cur;
9482 				continue;
9483 			}
9484 
9485 			if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9486 				return -ENOMEM;
9487 
9488 			memcpy(data + size, expr, expr->ops->size);
9489 			size += expr->ops->size;
9490 		}
9491 		if (WARN_ON_ONCE(size >= 1 << 12))
9492 			return -ENOMEM;
9493 
9494 		prule->handle = rule->handle;
9495 		prule->dlen = size;
9496 		prule->is_last = 0;
9497 
9498 		data += size;
9499 		size = 0;
9500 		chain->blob_next->size += (unsigned long)(data - (void *)prule);
9501 	}
9502 
9503 	if (WARN_ON_ONCE(data > data_boundary))
9504 		return -ENOMEM;
9505 
9506 	prule = (struct nft_rule_dp *)data;
9507 	nft_last_rule(chain, prule);
9508 
9509 	return 0;
9510 }
9511 
nf_tables_commit_chain_prepare_cancel(struct net * net)9512 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9513 {
9514 	struct nftables_pernet *nft_net = nft_pernet(net);
9515 	struct nft_trans *trans, *next;
9516 
9517 	list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9518 		struct nft_chain *chain = trans->ctx.chain;
9519 
9520 		if (trans->msg_type == NFT_MSG_NEWRULE ||
9521 		    trans->msg_type == NFT_MSG_DELRULE) {
9522 			kvfree(chain->blob_next);
9523 			chain->blob_next = NULL;
9524 		}
9525 	}
9526 }
9527 
__nf_tables_commit_chain_free_rules(struct rcu_head * h)9528 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9529 {
9530 	struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9531 
9532 	kvfree(l->blob);
9533 }
9534 
nf_tables_commit_chain_free_rules_old(struct nft_rule_blob * blob)9535 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9536 {
9537 	struct nft_rule_dp_last *last;
9538 
9539 	/* last rule trailer is after end marker */
9540 	last = (void *)blob + sizeof(*blob) + blob->size;
9541 	last->blob = blob;
9542 
9543 	call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9544 }
9545 
nf_tables_commit_chain(struct net * net,struct nft_chain * chain)9546 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9547 {
9548 	struct nft_rule_blob *g0, *g1;
9549 	bool next_genbit;
9550 
9551 	next_genbit = nft_gencursor_next(net);
9552 
9553 	g0 = rcu_dereference_protected(chain->blob_gen_0,
9554 				       lockdep_commit_lock_is_held(net));
9555 	g1 = rcu_dereference_protected(chain->blob_gen_1,
9556 				       lockdep_commit_lock_is_held(net));
9557 
9558 	/* No changes to this chain? */
9559 	if (chain->blob_next == NULL) {
9560 		/* chain had no change in last or next generation */
9561 		if (g0 == g1)
9562 			return;
9563 		/*
9564 		 * chain had no change in this generation; make sure next
9565 		 * one uses same rules as current generation.
9566 		 */
9567 		if (next_genbit) {
9568 			rcu_assign_pointer(chain->blob_gen_1, g0);
9569 			nf_tables_commit_chain_free_rules_old(g1);
9570 		} else {
9571 			rcu_assign_pointer(chain->blob_gen_0, g1);
9572 			nf_tables_commit_chain_free_rules_old(g0);
9573 		}
9574 
9575 		return;
9576 	}
9577 
9578 	if (next_genbit)
9579 		rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9580 	else
9581 		rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9582 
9583 	chain->blob_next = NULL;
9584 
9585 	if (g0 == g1)
9586 		return;
9587 
9588 	if (next_genbit)
9589 		nf_tables_commit_chain_free_rules_old(g1);
9590 	else
9591 		nf_tables_commit_chain_free_rules_old(g0);
9592 }
9593 
nft_obj_del(struct nft_object * obj)9594 static void nft_obj_del(struct nft_object *obj)
9595 {
9596 	rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9597 	list_del_rcu(&obj->list);
9598 }
9599 
nft_chain_del(struct nft_chain * chain)9600 void nft_chain_del(struct nft_chain *chain)
9601 {
9602 	struct nft_table *table = chain->table;
9603 
9604 	WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9605 				     nft_chain_ht_params));
9606 	list_del_rcu(&chain->list);
9607 }
9608 
nft_trans_gc_setelem_remove(struct nft_ctx * ctx,struct nft_trans_gc * trans)9609 static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
9610 					struct nft_trans_gc *trans)
9611 {
9612 	void **priv = trans->priv;
9613 	unsigned int i;
9614 
9615 	for (i = 0; i < trans->count; i++) {
9616 		struct nft_set_elem elem = {
9617 			.priv = priv[i],
9618 		};
9619 
9620 		nft_setelem_data_deactivate(ctx->net, trans->set, &elem);
9621 		nft_setelem_remove(ctx->net, trans->set, &elem);
9622 	}
9623 }
9624 
nft_trans_gc_destroy(struct nft_trans_gc * trans)9625 void nft_trans_gc_destroy(struct nft_trans_gc *trans)
9626 {
9627 	nft_set_put(trans->set);
9628 	put_net(trans->net);
9629 	kfree(trans);
9630 }
9631 
nft_trans_gc_trans_free(struct rcu_head * rcu)9632 static void nft_trans_gc_trans_free(struct rcu_head *rcu)
9633 {
9634 	struct nft_set_elem elem = {};
9635 	struct nft_trans_gc *trans;
9636 	struct nft_ctx ctx = {};
9637 	unsigned int i;
9638 
9639 	trans = container_of(rcu, struct nft_trans_gc, rcu);
9640 	ctx.net	= read_pnet(&trans->set->net);
9641 
9642 	for (i = 0; i < trans->count; i++) {
9643 		elem.priv = trans->priv[i];
9644 		if (!nft_setelem_is_catchall(trans->set, &elem))
9645 			atomic_dec(&trans->set->nelems);
9646 
9647 		nf_tables_set_elem_destroy(&ctx, trans->set, elem.priv);
9648 	}
9649 
9650 	nft_trans_gc_destroy(trans);
9651 }
9652 
nft_trans_gc_work_done(struct nft_trans_gc * trans)9653 static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
9654 {
9655 	struct nftables_pernet *nft_net;
9656 	struct nft_ctx ctx = {};
9657 
9658 	nft_net = nft_pernet(trans->net);
9659 
9660 	mutex_lock(&nft_net->commit_mutex);
9661 
9662 	/* Check for race with transaction, otherwise this batch refers to
9663 	 * stale objects that might not be there anymore. Skip transaction if
9664 	 * set has been destroyed from control plane transaction in case gc
9665 	 * worker loses race.
9666 	 */
9667 	if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
9668 		mutex_unlock(&nft_net->commit_mutex);
9669 		return false;
9670 	}
9671 
9672 	ctx.net = trans->net;
9673 	ctx.table = trans->set->table;
9674 
9675 	nft_trans_gc_setelem_remove(&ctx, trans);
9676 	mutex_unlock(&nft_net->commit_mutex);
9677 
9678 	return true;
9679 }
9680 
nft_trans_gc_work(struct work_struct * work)9681 static void nft_trans_gc_work(struct work_struct *work)
9682 {
9683 	struct nft_trans_gc *trans, *next;
9684 	LIST_HEAD(trans_gc_list);
9685 
9686 	spin_lock(&nf_tables_gc_list_lock);
9687 	list_splice_init(&nf_tables_gc_list, &trans_gc_list);
9688 	spin_unlock(&nf_tables_gc_list_lock);
9689 
9690 	list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
9691 		list_del(&trans->list);
9692 		if (!nft_trans_gc_work_done(trans)) {
9693 			nft_trans_gc_destroy(trans);
9694 			continue;
9695 		}
9696 		call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9697 	}
9698 }
9699 
nft_trans_gc_alloc(struct nft_set * set,unsigned int gc_seq,gfp_t gfp)9700 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
9701 					unsigned int gc_seq, gfp_t gfp)
9702 {
9703 	struct net *net = read_pnet(&set->net);
9704 	struct nft_trans_gc *trans;
9705 
9706 	trans = kzalloc(sizeof(*trans), gfp);
9707 	if (!trans)
9708 		return NULL;
9709 
9710 	trans->net = maybe_get_net(net);
9711 	if (!trans->net) {
9712 		kfree(trans);
9713 		return NULL;
9714 	}
9715 
9716 	refcount_inc(&set->refs);
9717 	trans->set = set;
9718 	trans->seq = gc_seq;
9719 
9720 	return trans;
9721 }
9722 
nft_trans_gc_elem_add(struct nft_trans_gc * trans,void * priv)9723 void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
9724 {
9725 	trans->priv[trans->count++] = priv;
9726 }
9727 
nft_trans_gc_queue_work(struct nft_trans_gc * trans)9728 static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
9729 {
9730 	spin_lock(&nf_tables_gc_list_lock);
9731 	list_add_tail(&trans->list, &nf_tables_gc_list);
9732 	spin_unlock(&nf_tables_gc_list_lock);
9733 
9734 	schedule_work(&trans_gc_work);
9735 }
9736 
nft_trans_gc_space(struct nft_trans_gc * trans)9737 static int nft_trans_gc_space(struct nft_trans_gc *trans)
9738 {
9739 	return NFT_TRANS_GC_BATCHCOUNT - trans->count;
9740 }
9741 
nft_trans_gc_queue_async(struct nft_trans_gc * gc,unsigned int gc_seq,gfp_t gfp)9742 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
9743 					      unsigned int gc_seq, gfp_t gfp)
9744 {
9745 	struct nft_set *set;
9746 
9747 	if (nft_trans_gc_space(gc))
9748 		return gc;
9749 
9750 	set = gc->set;
9751 	nft_trans_gc_queue_work(gc);
9752 
9753 	return nft_trans_gc_alloc(set, gc_seq, gfp);
9754 }
9755 
nft_trans_gc_queue_async_done(struct nft_trans_gc * trans)9756 void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
9757 {
9758 	if (trans->count == 0) {
9759 		nft_trans_gc_destroy(trans);
9760 		return;
9761 	}
9762 
9763 	nft_trans_gc_queue_work(trans);
9764 }
9765 
nft_trans_gc_queue_sync(struct nft_trans_gc * gc,gfp_t gfp)9766 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
9767 {
9768 	struct nft_set *set;
9769 
9770 	if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
9771 		return NULL;
9772 
9773 	if (nft_trans_gc_space(gc))
9774 		return gc;
9775 
9776 	set = gc->set;
9777 	call_rcu(&gc->rcu, nft_trans_gc_trans_free);
9778 
9779 	return nft_trans_gc_alloc(set, 0, gfp);
9780 }
9781 
nft_trans_gc_queue_sync_done(struct nft_trans_gc * trans)9782 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
9783 {
9784 	WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
9785 
9786 	if (trans->count == 0) {
9787 		nft_trans_gc_destroy(trans);
9788 		return;
9789 	}
9790 
9791 	call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9792 }
9793 
nft_trans_gc_catchall_async(struct nft_trans_gc * gc,unsigned int gc_seq)9794 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
9795 						 unsigned int gc_seq)
9796 {
9797 	struct nft_set_elem_catchall *catchall;
9798 	const struct nft_set *set = gc->set;
9799 	struct nft_set_ext *ext;
9800 
9801 	list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9802 		ext = nft_set_elem_ext(set, catchall->elem);
9803 
9804 		if (!nft_set_elem_expired(ext))
9805 			continue;
9806 		if (nft_set_elem_is_dead(ext))
9807 			goto dead_elem;
9808 
9809 		nft_set_elem_dead(ext);
9810 dead_elem:
9811 		gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
9812 		if (!gc)
9813 			return NULL;
9814 
9815 		nft_trans_gc_elem_add(gc, catchall->elem);
9816 	}
9817 
9818 	return gc;
9819 }
9820 
nft_trans_gc_catchall_sync(struct nft_trans_gc * gc)9821 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc)
9822 {
9823 	struct nft_set_elem_catchall *catchall, *next;
9824 	const struct nft_set *set = gc->set;
9825 	struct nft_set_elem elem;
9826 	struct nft_set_ext *ext;
9827 
9828 	WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net));
9829 
9830 	list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
9831 		ext = nft_set_elem_ext(set, catchall->elem);
9832 
9833 		if (!nft_set_elem_expired(ext))
9834 			continue;
9835 
9836 		gc = nft_trans_gc_queue_sync(gc, GFP_KERNEL);
9837 		if (!gc)
9838 			return NULL;
9839 
9840 		memset(&elem, 0, sizeof(elem));
9841 		elem.priv = catchall->elem;
9842 
9843 		nft_setelem_data_deactivate(gc->net, gc->set, &elem);
9844 		nft_setelem_catchall_destroy(catchall);
9845 		nft_trans_gc_elem_add(gc, elem.priv);
9846 	}
9847 
9848 	return gc;
9849 }
9850 
nf_tables_module_autoload_cleanup(struct net * net)9851 static void nf_tables_module_autoload_cleanup(struct net *net)
9852 {
9853 	struct nftables_pernet *nft_net = nft_pernet(net);
9854 	struct nft_module_request *req, *next;
9855 
9856 	WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9857 	list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9858 		WARN_ON_ONCE(!req->done);
9859 		list_del(&req->list);
9860 		kfree(req);
9861 	}
9862 }
9863 
nf_tables_commit_release(struct net * net)9864 static void nf_tables_commit_release(struct net *net)
9865 {
9866 	struct nftables_pernet *nft_net = nft_pernet(net);
9867 	struct nft_trans *trans;
9868 
9869 	/* all side effects have to be made visible.
9870 	 * For example, if a chain named 'foo' has been deleted, a
9871 	 * new transaction must not find it anymore.
9872 	 *
9873 	 * Memory reclaim happens asynchronously from work queue
9874 	 * to prevent expensive synchronize_rcu() in commit phase.
9875 	 */
9876 	if (list_empty(&nft_net->commit_list)) {
9877 		nf_tables_module_autoload_cleanup(net);
9878 		mutex_unlock(&nft_net->commit_mutex);
9879 		return;
9880 	}
9881 
9882 	trans = list_last_entry(&nft_net->commit_list,
9883 				struct nft_trans, list);
9884 	get_net(trans->ctx.net);
9885 	WARN_ON_ONCE(trans->put_net);
9886 
9887 	trans->put_net = true;
9888 	spin_lock(&nf_tables_destroy_list_lock);
9889 	list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9890 	spin_unlock(&nf_tables_destroy_list_lock);
9891 
9892 	nf_tables_module_autoload_cleanup(net);
9893 	schedule_work(&trans_destroy_work);
9894 
9895 	mutex_unlock(&nft_net->commit_mutex);
9896 }
9897 
nft_commit_notify(struct net * net,u32 portid)9898 static void nft_commit_notify(struct net *net, u32 portid)
9899 {
9900 	struct nftables_pernet *nft_net = nft_pernet(net);
9901 	struct sk_buff *batch_skb = NULL, *nskb, *skb;
9902 	unsigned char *data;
9903 	int len;
9904 
9905 	list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9906 		if (!batch_skb) {
9907 new_batch:
9908 			batch_skb = skb;
9909 			len = NLMSG_GOODSIZE - skb->len;
9910 			list_del(&skb->list);
9911 			continue;
9912 		}
9913 		len -= skb->len;
9914 		if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9915 			data = skb_put(batch_skb, skb->len);
9916 			memcpy(data, skb->data, skb->len);
9917 			list_del(&skb->list);
9918 			kfree_skb(skb);
9919 			continue;
9920 		}
9921 		nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9922 			       NFT_CB(batch_skb).report, GFP_KERNEL);
9923 		goto new_batch;
9924 	}
9925 
9926 	if (batch_skb) {
9927 		nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9928 			       NFT_CB(batch_skb).report, GFP_KERNEL);
9929 	}
9930 
9931 	WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9932 }
9933 
nf_tables_commit_audit_alloc(struct list_head * adl,struct nft_table * table)9934 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9935 					struct nft_table *table)
9936 {
9937 	struct nft_audit_data *adp;
9938 
9939 	list_for_each_entry(adp, adl, list) {
9940 		if (adp->table == table)
9941 			return 0;
9942 	}
9943 	adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9944 	if (!adp)
9945 		return -ENOMEM;
9946 	adp->table = table;
9947 	list_add(&adp->list, adl);
9948 	return 0;
9949 }
9950 
nf_tables_commit_audit_free(struct list_head * adl)9951 static void nf_tables_commit_audit_free(struct list_head *adl)
9952 {
9953 	struct nft_audit_data *adp, *adn;
9954 
9955 	list_for_each_entry_safe(adp, adn, adl, list) {
9956 		list_del(&adp->list);
9957 		kfree(adp);
9958 	}
9959 }
9960 
nf_tables_commit_audit_collect(struct list_head * adl,struct nft_table * table,u32 op)9961 static void nf_tables_commit_audit_collect(struct list_head *adl,
9962 					   struct nft_table *table, u32 op)
9963 {
9964 	struct nft_audit_data *adp;
9965 
9966 	list_for_each_entry(adp, adl, list) {
9967 		if (adp->table == table)
9968 			goto found;
9969 	}
9970 	WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9971 	return;
9972 found:
9973 	adp->entries++;
9974 	if (!adp->op || adp->op > op)
9975 		adp->op = op;
9976 }
9977 
9978 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9979 
nf_tables_commit_audit_log(struct list_head * adl,u32 generation)9980 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9981 {
9982 	struct nft_audit_data *adp, *adn;
9983 	char aubuf[AUNFTABLENAMELEN];
9984 
9985 	list_for_each_entry_safe(adp, adn, adl, list) {
9986 		snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9987 			 generation);
9988 		audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9989 				nft2audit_op[adp->op], GFP_KERNEL);
9990 		list_del(&adp->list);
9991 		kfree(adp);
9992 	}
9993 }
9994 
nft_set_commit_update(struct list_head * set_update_list)9995 static void nft_set_commit_update(struct list_head *set_update_list)
9996 {
9997 	struct nft_set *set, *next;
9998 
9999 	list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10000 		list_del_init(&set->pending_update);
10001 
10002 		if (!set->ops->commit || set->dead)
10003 			continue;
10004 
10005 		set->ops->commit(set);
10006 	}
10007 }
10008 
nft_gc_seq_begin(struct nftables_pernet * nft_net)10009 static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
10010 {
10011 	unsigned int gc_seq;
10012 
10013 	/* Bump gc counter, it becomes odd, this is the busy mark. */
10014 	gc_seq = READ_ONCE(nft_net->gc_seq);
10015 	WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
10016 
10017 	return gc_seq;
10018 }
10019 
nft_gc_seq_end(struct nftables_pernet * nft_net,unsigned int gc_seq)10020 static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
10021 {
10022 	WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
10023 }
10024 
nf_tables_commit(struct net * net,struct sk_buff * skb)10025 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
10026 {
10027 	struct nftables_pernet *nft_net = nft_pernet(net);
10028 	struct nft_trans *trans, *next;
10029 	unsigned int base_seq, gc_seq;
10030 	LIST_HEAD(set_update_list);
10031 	struct nft_trans_elem *te;
10032 	struct nft_chain *chain;
10033 	struct nft_table *table;
10034 	LIST_HEAD(adl);
10035 	int err;
10036 
10037 	if (list_empty(&nft_net->commit_list)) {
10038 		mutex_unlock(&nft_net->commit_mutex);
10039 		return 0;
10040 	}
10041 
10042 	list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
10043 		switch (trans->msg_type) {
10044 		case NFT_MSG_NEWSET:
10045 			if (!nft_trans_set_update(trans) &&
10046 			    nft_set_is_anonymous(nft_trans_set(trans)) &&
10047 			    !nft_trans_set_bound(trans)) {
10048 				pr_warn_once("nftables ruleset with unbound set\n");
10049 				return -EINVAL;
10050 			}
10051 			break;
10052 		case NFT_MSG_NEWCHAIN:
10053 			if (!nft_trans_chain_update(trans) &&
10054 			    nft_chain_binding(nft_trans_chain(trans)) &&
10055 			    !nft_trans_chain_bound(trans)) {
10056 				pr_warn_once("nftables ruleset with unbound chain\n");
10057 				return -EINVAL;
10058 			}
10059 			break;
10060 		}
10061 	}
10062 
10063 	/* 0. Validate ruleset, otherwise roll back for error reporting. */
10064 	if (nf_tables_validate(net) < 0) {
10065 		nft_net->validate_state = NFT_VALIDATE_DO;
10066 		return -EAGAIN;
10067 	}
10068 
10069 	err = nft_flow_rule_offload_commit(net);
10070 	if (err < 0)
10071 		return err;
10072 
10073 	/* 1.  Allocate space for next generation rules_gen_X[] */
10074 	list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10075 		int ret;
10076 
10077 		ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
10078 		if (ret) {
10079 			nf_tables_commit_chain_prepare_cancel(net);
10080 			nf_tables_commit_audit_free(&adl);
10081 			return ret;
10082 		}
10083 		if (trans->msg_type == NFT_MSG_NEWRULE ||
10084 		    trans->msg_type == NFT_MSG_DELRULE) {
10085 			chain = trans->ctx.chain;
10086 
10087 			ret = nf_tables_commit_chain_prepare(net, chain);
10088 			if (ret < 0) {
10089 				nf_tables_commit_chain_prepare_cancel(net);
10090 				nf_tables_commit_audit_free(&adl);
10091 				return ret;
10092 			}
10093 		}
10094 	}
10095 
10096 	/* step 2.  Make rules_gen_X visible to packet path */
10097 	list_for_each_entry(table, &nft_net->tables, list) {
10098 		list_for_each_entry(chain, &table->chains, list)
10099 			nf_tables_commit_chain(net, chain);
10100 	}
10101 
10102 	/*
10103 	 * Bump generation counter, invalidate any dump in progress.
10104 	 * Cannot fail after this point.
10105 	 */
10106 	base_seq = READ_ONCE(nft_net->base_seq);
10107 	while (++base_seq == 0)
10108 		;
10109 
10110 	WRITE_ONCE(nft_net->base_seq, base_seq);
10111 
10112 	gc_seq = nft_gc_seq_begin(nft_net);
10113 
10114 	/* step 3. Start new generation, rules_gen_X now in use. */
10115 	net->nft.gencursor = nft_gencursor_next(net);
10116 
10117 	list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10118 		nf_tables_commit_audit_collect(&adl, trans->ctx.table,
10119 					       trans->msg_type);
10120 		switch (trans->msg_type) {
10121 		case NFT_MSG_NEWTABLE:
10122 			if (nft_trans_table_update(trans)) {
10123 				if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10124 					nft_trans_destroy(trans);
10125 					break;
10126 				}
10127 				if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
10128 					nf_tables_table_disable(net, trans->ctx.table);
10129 
10130 				trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10131 			} else {
10132 				nft_clear(net, trans->ctx.table);
10133 			}
10134 			nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
10135 			nft_trans_destroy(trans);
10136 			break;
10137 		case NFT_MSG_DELTABLE:
10138 		case NFT_MSG_DESTROYTABLE:
10139 			list_del_rcu(&trans->ctx.table->list);
10140 			nf_tables_table_notify(&trans->ctx, trans->msg_type);
10141 			break;
10142 		case NFT_MSG_NEWCHAIN:
10143 			if (nft_trans_chain_update(trans)) {
10144 				nft_chain_commit_update(trans);
10145 				nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
10146 						       &nft_trans_chain_hooks(trans));
10147 				list_splice(&nft_trans_chain_hooks(trans),
10148 					    &nft_trans_basechain(trans)->hook_list);
10149 				/* trans destroyed after rcu grace period */
10150 			} else {
10151 				nft_chain_commit_drop_policy(trans);
10152 				nft_clear(net, trans->ctx.chain);
10153 				nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
10154 				nft_trans_destroy(trans);
10155 			}
10156 			break;
10157 		case NFT_MSG_DELCHAIN:
10158 		case NFT_MSG_DESTROYCHAIN:
10159 			if (nft_trans_chain_update(trans)) {
10160 				nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10161 						       &nft_trans_chain_hooks(trans));
10162 				if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT)) {
10163 					nft_netdev_unregister_hooks(net,
10164 								    &nft_trans_chain_hooks(trans),
10165 								    true);
10166 				}
10167 			} else {
10168 				nft_chain_del(trans->ctx.chain);
10169 				nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10170 						       NULL);
10171 				nf_tables_unregister_hook(trans->ctx.net,
10172 							  trans->ctx.table,
10173 							  trans->ctx.chain);
10174 			}
10175 			break;
10176 		case NFT_MSG_NEWRULE:
10177 			nft_clear(trans->ctx.net, nft_trans_rule(trans));
10178 			nf_tables_rule_notify(&trans->ctx,
10179 					      nft_trans_rule(trans),
10180 					      NFT_MSG_NEWRULE);
10181 			if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10182 				nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10183 
10184 			nft_trans_destroy(trans);
10185 			break;
10186 		case NFT_MSG_DELRULE:
10187 		case NFT_MSG_DESTROYRULE:
10188 			list_del_rcu(&nft_trans_rule(trans)->list);
10189 			nf_tables_rule_notify(&trans->ctx,
10190 					      nft_trans_rule(trans),
10191 					      trans->msg_type);
10192 			nft_rule_expr_deactivate(&trans->ctx,
10193 						 nft_trans_rule(trans),
10194 						 NFT_TRANS_COMMIT);
10195 
10196 			if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10197 				nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10198 			break;
10199 		case NFT_MSG_NEWSET:
10200 			if (nft_trans_set_update(trans)) {
10201 				struct nft_set *set = nft_trans_set(trans);
10202 
10203 				WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
10204 				WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
10205 
10206 				if (nft_trans_set_size(trans))
10207 					WRITE_ONCE(set->size, nft_trans_set_size(trans));
10208 			} else {
10209 				nft_clear(net, nft_trans_set(trans));
10210 				/* This avoids hitting -EBUSY when deleting the table
10211 				 * from the transaction.
10212 				 */
10213 				if (nft_set_is_anonymous(nft_trans_set(trans)) &&
10214 				    !list_empty(&nft_trans_set(trans)->bindings))
10215 					nft_use_dec(&trans->ctx.table->use);
10216 			}
10217 			nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10218 					     NFT_MSG_NEWSET, GFP_KERNEL);
10219 			nft_trans_destroy(trans);
10220 			break;
10221 		case NFT_MSG_DELSET:
10222 		case NFT_MSG_DESTROYSET:
10223 			nft_trans_set(trans)->dead = 1;
10224 			list_del_rcu(&nft_trans_set(trans)->list);
10225 			nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10226 					     trans->msg_type, GFP_KERNEL);
10227 			break;
10228 		case NFT_MSG_NEWSETELEM:
10229 			te = (struct nft_trans_elem *)trans->data;
10230 
10231 			nft_setelem_activate(net, te->set, &te->elem);
10232 			nf_tables_setelem_notify(&trans->ctx, te->set,
10233 						 &te->elem,
10234 						 NFT_MSG_NEWSETELEM);
10235 			if (te->set->ops->commit &&
10236 			    list_empty(&te->set->pending_update)) {
10237 				list_add_tail(&te->set->pending_update,
10238 					      &set_update_list);
10239 			}
10240 			nft_trans_destroy(trans);
10241 			break;
10242 		case NFT_MSG_DELSETELEM:
10243 		case NFT_MSG_DESTROYSETELEM:
10244 			te = (struct nft_trans_elem *)trans->data;
10245 
10246 			nf_tables_setelem_notify(&trans->ctx, te->set,
10247 						 &te->elem,
10248 						 trans->msg_type);
10249 			nft_setelem_remove(net, te->set, &te->elem);
10250 			if (!nft_setelem_is_catchall(te->set, &te->elem)) {
10251 				atomic_dec(&te->set->nelems);
10252 				te->set->ndeact--;
10253 			}
10254 			if (te->set->ops->commit &&
10255 			    list_empty(&te->set->pending_update)) {
10256 				list_add_tail(&te->set->pending_update,
10257 					      &set_update_list);
10258 			}
10259 			break;
10260 		case NFT_MSG_NEWOBJ:
10261 			if (nft_trans_obj_update(trans)) {
10262 				nft_obj_commit_update(trans);
10263 				nf_tables_obj_notify(&trans->ctx,
10264 						     nft_trans_obj(trans),
10265 						     NFT_MSG_NEWOBJ);
10266 			} else {
10267 				nft_clear(net, nft_trans_obj(trans));
10268 				nf_tables_obj_notify(&trans->ctx,
10269 						     nft_trans_obj(trans),
10270 						     NFT_MSG_NEWOBJ);
10271 				nft_trans_destroy(trans);
10272 			}
10273 			break;
10274 		case NFT_MSG_DELOBJ:
10275 		case NFT_MSG_DESTROYOBJ:
10276 			nft_obj_del(nft_trans_obj(trans));
10277 			nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
10278 					     trans->msg_type);
10279 			break;
10280 		case NFT_MSG_NEWFLOWTABLE:
10281 			if (nft_trans_flowtable_update(trans)) {
10282 				nft_trans_flowtable(trans)->data.flags =
10283 					nft_trans_flowtable_flags(trans);
10284 				nf_tables_flowtable_notify(&trans->ctx,
10285 							   nft_trans_flowtable(trans),
10286 							   &nft_trans_flowtable_hooks(trans),
10287 							   NFT_MSG_NEWFLOWTABLE);
10288 				list_splice(&nft_trans_flowtable_hooks(trans),
10289 					    &nft_trans_flowtable(trans)->hook_list);
10290 			} else {
10291 				nft_clear(net, nft_trans_flowtable(trans));
10292 				nf_tables_flowtable_notify(&trans->ctx,
10293 							   nft_trans_flowtable(trans),
10294 							   NULL,
10295 							   NFT_MSG_NEWFLOWTABLE);
10296 			}
10297 			nft_trans_destroy(trans);
10298 			break;
10299 		case NFT_MSG_DELFLOWTABLE:
10300 		case NFT_MSG_DESTROYFLOWTABLE:
10301 			if (nft_trans_flowtable_update(trans)) {
10302 				nf_tables_flowtable_notify(&trans->ctx,
10303 							   nft_trans_flowtable(trans),
10304 							   &nft_trans_flowtable_hooks(trans),
10305 							   trans->msg_type);
10306 				nft_unregister_flowtable_net_hooks(net,
10307 								   &nft_trans_flowtable_hooks(trans));
10308 			} else {
10309 				list_del_rcu(&nft_trans_flowtable(trans)->list);
10310 				nf_tables_flowtable_notify(&trans->ctx,
10311 							   nft_trans_flowtable(trans),
10312 							   NULL,
10313 							   trans->msg_type);
10314 				nft_unregister_flowtable_net_hooks(net,
10315 						&nft_trans_flowtable(trans)->hook_list);
10316 			}
10317 			break;
10318 		}
10319 	}
10320 
10321 	nft_set_commit_update(&set_update_list);
10322 
10323 	nft_commit_notify(net, NETLINK_CB(skb).portid);
10324 	nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
10325 	nf_tables_commit_audit_log(&adl, nft_net->base_seq);
10326 
10327 	nft_gc_seq_end(nft_net, gc_seq);
10328 	nft_net->validate_state = NFT_VALIDATE_SKIP;
10329 	nf_tables_commit_release(net);
10330 
10331 	return 0;
10332 }
10333 
nf_tables_module_autoload(struct net * net)10334 static void nf_tables_module_autoload(struct net *net)
10335 {
10336 	struct nftables_pernet *nft_net = nft_pernet(net);
10337 	struct nft_module_request *req, *next;
10338 	LIST_HEAD(module_list);
10339 
10340 	list_splice_init(&nft_net->module_list, &module_list);
10341 	mutex_unlock(&nft_net->commit_mutex);
10342 	list_for_each_entry_safe(req, next, &module_list, list) {
10343 		request_module("%s", req->module);
10344 		req->done = true;
10345 	}
10346 	mutex_lock(&nft_net->commit_mutex);
10347 	list_splice(&module_list, &nft_net->module_list);
10348 }
10349 
nf_tables_abort_release(struct nft_trans * trans)10350 static void nf_tables_abort_release(struct nft_trans *trans)
10351 {
10352 	switch (trans->msg_type) {
10353 	case NFT_MSG_NEWTABLE:
10354 		nf_tables_table_destroy(&trans->ctx);
10355 		break;
10356 	case NFT_MSG_NEWCHAIN:
10357 		if (nft_trans_chain_update(trans))
10358 			nft_hooks_destroy(&nft_trans_chain_hooks(trans));
10359 		else
10360 			nf_tables_chain_destroy(&trans->ctx);
10361 		break;
10362 	case NFT_MSG_NEWRULE:
10363 		nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
10364 		break;
10365 	case NFT_MSG_NEWSET:
10366 		nft_set_destroy(&trans->ctx, nft_trans_set(trans));
10367 		break;
10368 	case NFT_MSG_NEWSETELEM:
10369 		nft_set_elem_destroy(nft_trans_elem_set(trans),
10370 				     nft_trans_elem(trans).priv, true);
10371 		break;
10372 	case NFT_MSG_NEWOBJ:
10373 		nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
10374 		break;
10375 	case NFT_MSG_NEWFLOWTABLE:
10376 		if (nft_trans_flowtable_update(trans))
10377 			nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
10378 		else
10379 			nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
10380 		break;
10381 	}
10382 	kfree(trans);
10383 }
10384 
nft_set_abort_update(struct list_head * set_update_list)10385 static void nft_set_abort_update(struct list_head *set_update_list)
10386 {
10387 	struct nft_set *set, *next;
10388 
10389 	list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10390 		list_del_init(&set->pending_update);
10391 
10392 		if (!set->ops->abort)
10393 			continue;
10394 
10395 		set->ops->abort(set);
10396 	}
10397 }
10398 
__nf_tables_abort(struct net * net,enum nfnl_abort_action action)10399 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
10400 {
10401 	struct nftables_pernet *nft_net = nft_pernet(net);
10402 	struct nft_trans *trans, *next;
10403 	LIST_HEAD(set_update_list);
10404 	struct nft_trans_elem *te;
10405 	int err = 0;
10406 
10407 	if (action == NFNL_ABORT_VALIDATE &&
10408 	    nf_tables_validate(net) < 0)
10409 		err = -EAGAIN;
10410 
10411 	list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
10412 					 list) {
10413 		switch (trans->msg_type) {
10414 		case NFT_MSG_NEWTABLE:
10415 			if (nft_trans_table_update(trans)) {
10416 				if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10417 					nft_trans_destroy(trans);
10418 					break;
10419 				}
10420 				if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
10421 					nf_tables_table_disable(net, trans->ctx.table);
10422 					trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
10423 				} else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
10424 					trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
10425 				}
10426 				trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10427 				nft_trans_destroy(trans);
10428 			} else {
10429 				list_del_rcu(&trans->ctx.table->list);
10430 			}
10431 			break;
10432 		case NFT_MSG_DELTABLE:
10433 		case NFT_MSG_DESTROYTABLE:
10434 			nft_clear(trans->ctx.net, trans->ctx.table);
10435 			nft_trans_destroy(trans);
10436 			break;
10437 		case NFT_MSG_NEWCHAIN:
10438 			if (nft_trans_chain_update(trans)) {
10439 				if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT)) {
10440 					nft_netdev_unregister_hooks(net,
10441 								    &nft_trans_chain_hooks(trans),
10442 								    true);
10443 				}
10444 				free_percpu(nft_trans_chain_stats(trans));
10445 				kfree(nft_trans_chain_name(trans));
10446 				nft_trans_destroy(trans);
10447 			} else {
10448 				if (nft_trans_chain_bound(trans)) {
10449 					nft_trans_destroy(trans);
10450 					break;
10451 				}
10452 				nft_use_dec_restore(&trans->ctx.table->use);
10453 				nft_chain_del(trans->ctx.chain);
10454 				nf_tables_unregister_hook(trans->ctx.net,
10455 							  trans->ctx.table,
10456 							  trans->ctx.chain);
10457 			}
10458 			break;
10459 		case NFT_MSG_DELCHAIN:
10460 		case NFT_MSG_DESTROYCHAIN:
10461 			if (nft_trans_chain_update(trans)) {
10462 				list_splice(&nft_trans_chain_hooks(trans),
10463 					    &nft_trans_basechain(trans)->hook_list);
10464 			} else {
10465 				nft_use_inc_restore(&trans->ctx.table->use);
10466 				nft_clear(trans->ctx.net, trans->ctx.chain);
10467 			}
10468 			nft_trans_destroy(trans);
10469 			break;
10470 		case NFT_MSG_NEWRULE:
10471 			if (nft_trans_rule_bound(trans)) {
10472 				nft_trans_destroy(trans);
10473 				break;
10474 			}
10475 			nft_use_dec_restore(&trans->ctx.chain->use);
10476 			list_del_rcu(&nft_trans_rule(trans)->list);
10477 			nft_rule_expr_deactivate(&trans->ctx,
10478 						 nft_trans_rule(trans),
10479 						 NFT_TRANS_ABORT);
10480 			if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10481 				nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10482 			break;
10483 		case NFT_MSG_DELRULE:
10484 		case NFT_MSG_DESTROYRULE:
10485 			nft_use_inc_restore(&trans->ctx.chain->use);
10486 			nft_clear(trans->ctx.net, nft_trans_rule(trans));
10487 			nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10488 			if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10489 				nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10490 
10491 			nft_trans_destroy(trans);
10492 			break;
10493 		case NFT_MSG_NEWSET:
10494 			if (nft_trans_set_update(trans)) {
10495 				nft_trans_destroy(trans);
10496 				break;
10497 			}
10498 			nft_use_dec_restore(&trans->ctx.table->use);
10499 			if (nft_trans_set_bound(trans)) {
10500 				nft_trans_destroy(trans);
10501 				break;
10502 			}
10503 			nft_trans_set(trans)->dead = 1;
10504 			list_del_rcu(&nft_trans_set(trans)->list);
10505 			break;
10506 		case NFT_MSG_DELSET:
10507 		case NFT_MSG_DESTROYSET:
10508 			nft_use_inc_restore(&trans->ctx.table->use);
10509 			nft_clear(trans->ctx.net, nft_trans_set(trans));
10510 			if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10511 				nft_map_activate(&trans->ctx, nft_trans_set(trans));
10512 
10513 			nft_trans_destroy(trans);
10514 			break;
10515 		case NFT_MSG_NEWSETELEM:
10516 			if (nft_trans_elem_set_bound(trans)) {
10517 				nft_trans_destroy(trans);
10518 				break;
10519 			}
10520 			te = (struct nft_trans_elem *)trans->data;
10521 			nft_setelem_remove(net, te->set, &te->elem);
10522 			if (!nft_setelem_is_catchall(te->set, &te->elem))
10523 				atomic_dec(&te->set->nelems);
10524 
10525 			if (te->set->ops->abort &&
10526 			    list_empty(&te->set->pending_update)) {
10527 				list_add_tail(&te->set->pending_update,
10528 					      &set_update_list);
10529 			}
10530 			break;
10531 		case NFT_MSG_DELSETELEM:
10532 		case NFT_MSG_DESTROYSETELEM:
10533 			te = (struct nft_trans_elem *)trans->data;
10534 
10535 			nft_setelem_data_activate(net, te->set, &te->elem);
10536 			nft_setelem_activate(net, te->set, &te->elem);
10537 			if (!nft_setelem_is_catchall(te->set, &te->elem))
10538 				te->set->ndeact--;
10539 
10540 			if (te->set->ops->abort &&
10541 			    list_empty(&te->set->pending_update)) {
10542 				list_add_tail(&te->set->pending_update,
10543 					      &set_update_list);
10544 			}
10545 			nft_trans_destroy(trans);
10546 			break;
10547 		case NFT_MSG_NEWOBJ:
10548 			if (nft_trans_obj_update(trans)) {
10549 				nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10550 				nft_trans_destroy(trans);
10551 			} else {
10552 				nft_use_dec_restore(&trans->ctx.table->use);
10553 				nft_obj_del(nft_trans_obj(trans));
10554 			}
10555 			break;
10556 		case NFT_MSG_DELOBJ:
10557 		case NFT_MSG_DESTROYOBJ:
10558 			nft_use_inc_restore(&trans->ctx.table->use);
10559 			nft_clear(trans->ctx.net, nft_trans_obj(trans));
10560 			nft_trans_destroy(trans);
10561 			break;
10562 		case NFT_MSG_NEWFLOWTABLE:
10563 			if (nft_trans_flowtable_update(trans)) {
10564 				nft_unregister_flowtable_net_hooks(net,
10565 						&nft_trans_flowtable_hooks(trans));
10566 			} else {
10567 				nft_use_dec_restore(&trans->ctx.table->use);
10568 				list_del_rcu(&nft_trans_flowtable(trans)->list);
10569 				nft_unregister_flowtable_net_hooks(net,
10570 						&nft_trans_flowtable(trans)->hook_list);
10571 			}
10572 			break;
10573 		case NFT_MSG_DELFLOWTABLE:
10574 		case NFT_MSG_DESTROYFLOWTABLE:
10575 			if (nft_trans_flowtable_update(trans)) {
10576 				list_splice(&nft_trans_flowtable_hooks(trans),
10577 					    &nft_trans_flowtable(trans)->hook_list);
10578 			} else {
10579 				nft_use_inc_restore(&trans->ctx.table->use);
10580 				nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10581 			}
10582 			nft_trans_destroy(trans);
10583 			break;
10584 		}
10585 	}
10586 
10587 	nft_set_abort_update(&set_update_list);
10588 
10589 	synchronize_rcu();
10590 
10591 	list_for_each_entry_safe_reverse(trans, next,
10592 					 &nft_net->commit_list, list) {
10593 		nft_trans_list_del(trans);
10594 		nf_tables_abort_release(trans);
10595 	}
10596 
10597 	return err;
10598 }
10599 
nf_tables_abort(struct net * net,struct sk_buff * skb,enum nfnl_abort_action action)10600 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10601 			   enum nfnl_abort_action action)
10602 {
10603 	struct nftables_pernet *nft_net = nft_pernet(net);
10604 	unsigned int gc_seq;
10605 	int ret;
10606 
10607 	gc_seq = nft_gc_seq_begin(nft_net);
10608 	ret = __nf_tables_abort(net, action);
10609 	nft_gc_seq_end(nft_net, gc_seq);
10610 
10611 	WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
10612 
10613 	/* module autoload needs to happen after GC sequence update because it
10614 	 * temporarily releases and grabs mutex again.
10615 	 */
10616 	if (action == NFNL_ABORT_AUTOLOAD)
10617 		nf_tables_module_autoload(net);
10618 	else
10619 		nf_tables_module_autoload_cleanup(net);
10620 
10621 	mutex_unlock(&nft_net->commit_mutex);
10622 
10623 	return ret;
10624 }
10625 
nf_tables_valid_genid(struct net * net,u32 genid)10626 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10627 {
10628 	struct nftables_pernet *nft_net = nft_pernet(net);
10629 	bool genid_ok;
10630 
10631 	mutex_lock(&nft_net->commit_mutex);
10632 
10633 	genid_ok = genid == 0 || nft_net->base_seq == genid;
10634 	if (!genid_ok)
10635 		mutex_unlock(&nft_net->commit_mutex);
10636 
10637 	/* else, commit mutex has to be released by commit or abort function */
10638 	return genid_ok;
10639 }
10640 
10641 static const struct nfnetlink_subsystem nf_tables_subsys = {
10642 	.name		= "nf_tables",
10643 	.subsys_id	= NFNL_SUBSYS_NFTABLES,
10644 	.cb_count	= NFT_MSG_MAX,
10645 	.cb		= nf_tables_cb,
10646 	.commit		= nf_tables_commit,
10647 	.abort		= nf_tables_abort,
10648 	.valid_genid	= nf_tables_valid_genid,
10649 	.owner		= THIS_MODULE,
10650 };
10651 
nft_chain_validate_dependency(const struct nft_chain * chain,enum nft_chain_types type)10652 int nft_chain_validate_dependency(const struct nft_chain *chain,
10653 				  enum nft_chain_types type)
10654 {
10655 	const struct nft_base_chain *basechain;
10656 
10657 	if (nft_is_base_chain(chain)) {
10658 		basechain = nft_base_chain(chain);
10659 		if (basechain->type->type != type)
10660 			return -EOPNOTSUPP;
10661 	}
10662 	return 0;
10663 }
10664 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10665 
nft_chain_validate_hooks(const struct nft_chain * chain,unsigned int hook_flags)10666 int nft_chain_validate_hooks(const struct nft_chain *chain,
10667 			     unsigned int hook_flags)
10668 {
10669 	struct nft_base_chain *basechain;
10670 
10671 	if (nft_is_base_chain(chain)) {
10672 		basechain = nft_base_chain(chain);
10673 
10674 		if ((1 << basechain->ops.hooknum) & hook_flags)
10675 			return 0;
10676 
10677 		return -EOPNOTSUPP;
10678 	}
10679 
10680 	return 0;
10681 }
10682 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10683 
10684 /**
10685  *	nft_parse_u32_check - fetch u32 attribute and check for maximum value
10686  *
10687  *	@attr: netlink attribute to fetch value from
10688  *	@max: maximum value to be stored in dest
10689  *	@dest: pointer to the variable
10690  *
10691  *	Parse, check and store a given u32 netlink attribute into variable.
10692  *	This function returns -ERANGE if the value goes over maximum value.
10693  *	Otherwise a 0 is returned and the attribute value is stored in the
10694  *	destination variable.
10695  */
nft_parse_u32_check(const struct nlattr * attr,int max,u32 * dest)10696 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10697 {
10698 	u32 val;
10699 
10700 	val = ntohl(nla_get_be32(attr));
10701 	if (val > max)
10702 		return -ERANGE;
10703 
10704 	*dest = val;
10705 	return 0;
10706 }
10707 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10708 
nft_parse_register(const struct nlattr * attr,u32 * preg)10709 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10710 {
10711 	unsigned int reg;
10712 
10713 	reg = ntohl(nla_get_be32(attr));
10714 	switch (reg) {
10715 	case NFT_REG_VERDICT...NFT_REG_4:
10716 		*preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10717 		break;
10718 	case NFT_REG32_00...NFT_REG32_15:
10719 		*preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10720 		break;
10721 	default:
10722 		return -ERANGE;
10723 	}
10724 
10725 	return 0;
10726 }
10727 
10728 /**
10729  *	nft_dump_register - dump a register value to a netlink attribute
10730  *
10731  *	@skb: socket buffer
10732  *	@attr: attribute number
10733  *	@reg: register number
10734  *
10735  *	Construct a netlink attribute containing the register number. For
10736  *	compatibility reasons, register numbers being a multiple of 4 are
10737  *	translated to the corresponding 128 bit register numbers.
10738  */
nft_dump_register(struct sk_buff * skb,unsigned int attr,unsigned int reg)10739 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10740 {
10741 	if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10742 		reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10743 	else
10744 		reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10745 
10746 	return nla_put_be32(skb, attr, htonl(reg));
10747 }
10748 EXPORT_SYMBOL_GPL(nft_dump_register);
10749 
nft_validate_register_load(enum nft_registers reg,unsigned int len)10750 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10751 {
10752 	if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10753 		return -EINVAL;
10754 	if (len == 0)
10755 		return -EINVAL;
10756 	if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10757 		return -ERANGE;
10758 
10759 	return 0;
10760 }
10761 
nft_parse_register_load(const struct nlattr * attr,u8 * sreg,u32 len)10762 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10763 {
10764 	u32 reg;
10765 	int err;
10766 
10767 	err = nft_parse_register(attr, &reg);
10768 	if (err < 0)
10769 		return err;
10770 
10771 	err = nft_validate_register_load(reg, len);
10772 	if (err < 0)
10773 		return err;
10774 
10775 	*sreg = reg;
10776 	return 0;
10777 }
10778 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10779 
nft_validate_register_store(const struct nft_ctx * ctx,enum nft_registers reg,const struct nft_data * data,enum nft_data_types type,unsigned int len)10780 static int nft_validate_register_store(const struct nft_ctx *ctx,
10781 				       enum nft_registers reg,
10782 				       const struct nft_data *data,
10783 				       enum nft_data_types type,
10784 				       unsigned int len)
10785 {
10786 	int err;
10787 
10788 	switch (reg) {
10789 	case NFT_REG_VERDICT:
10790 		if (type != NFT_DATA_VERDICT)
10791 			return -EINVAL;
10792 
10793 		if (data != NULL &&
10794 		    (data->verdict.code == NFT_GOTO ||
10795 		     data->verdict.code == NFT_JUMP)) {
10796 			err = nft_chain_validate(ctx, data->verdict.chain);
10797 			if (err < 0)
10798 				return err;
10799 		}
10800 
10801 		return 0;
10802 	default:
10803 		if (type != NFT_DATA_VALUE)
10804 			return -EINVAL;
10805 
10806 		if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10807 			return -EINVAL;
10808 		if (len == 0)
10809 			return -EINVAL;
10810 		if (reg * NFT_REG32_SIZE + len >
10811 		    sizeof_field(struct nft_regs, data))
10812 			return -ERANGE;
10813 
10814 		return 0;
10815 	}
10816 }
10817 
nft_parse_register_store(const struct nft_ctx * ctx,const struct nlattr * attr,u8 * dreg,const struct nft_data * data,enum nft_data_types type,unsigned int len)10818 int nft_parse_register_store(const struct nft_ctx *ctx,
10819 			     const struct nlattr *attr, u8 *dreg,
10820 			     const struct nft_data *data,
10821 			     enum nft_data_types type, unsigned int len)
10822 {
10823 	int err;
10824 	u32 reg;
10825 
10826 	err = nft_parse_register(attr, &reg);
10827 	if (err < 0)
10828 		return err;
10829 
10830 	err = nft_validate_register_store(ctx, reg, data, type, len);
10831 	if (err < 0)
10832 		return err;
10833 
10834 	*dreg = reg;
10835 	return 0;
10836 }
10837 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10838 
10839 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10840 	[NFTA_VERDICT_CODE]	= { .type = NLA_U32 },
10841 	[NFTA_VERDICT_CHAIN]	= { .type = NLA_STRING,
10842 				    .len = NFT_CHAIN_MAXNAMELEN - 1 },
10843 	[NFTA_VERDICT_CHAIN_ID]	= { .type = NLA_U32 },
10844 };
10845 
nft_verdict_init(const struct nft_ctx * ctx,struct nft_data * data,struct nft_data_desc * desc,const struct nlattr * nla)10846 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10847 			    struct nft_data_desc *desc, const struct nlattr *nla)
10848 {
10849 	u8 genmask = nft_genmask_next(ctx->net);
10850 	struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10851 	struct nft_chain *chain;
10852 	int err;
10853 
10854 	err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10855 					  nft_verdict_policy, NULL);
10856 	if (err < 0)
10857 		return err;
10858 
10859 	if (!tb[NFTA_VERDICT_CODE])
10860 		return -EINVAL;
10861 
10862 	/* zero padding hole for memcmp */
10863 	memset(data, 0, sizeof(*data));
10864 	data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10865 
10866 	switch (data->verdict.code) {
10867 	case NF_ACCEPT:
10868 	case NF_DROP:
10869 	case NF_QUEUE:
10870 		break;
10871 	case NFT_CONTINUE:
10872 	case NFT_BREAK:
10873 	case NFT_RETURN:
10874 		break;
10875 	case NFT_JUMP:
10876 	case NFT_GOTO:
10877 		if (tb[NFTA_VERDICT_CHAIN]) {
10878 			chain = nft_chain_lookup(ctx->net, ctx->table,
10879 						 tb[NFTA_VERDICT_CHAIN],
10880 						 genmask);
10881 		} else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10882 			chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10883 						      tb[NFTA_VERDICT_CHAIN_ID],
10884 						      genmask);
10885 			if (IS_ERR(chain))
10886 				return PTR_ERR(chain);
10887 		} else {
10888 			return -EINVAL;
10889 		}
10890 
10891 		if (IS_ERR(chain))
10892 			return PTR_ERR(chain);
10893 		if (nft_is_base_chain(chain))
10894 			return -EOPNOTSUPP;
10895 		if (nft_chain_is_bound(chain))
10896 			return -EINVAL;
10897 		if (desc->flags & NFT_DATA_DESC_SETELEM &&
10898 		    chain->flags & NFT_CHAIN_BINDING)
10899 			return -EINVAL;
10900 		if (!nft_use_inc(&chain->use))
10901 			return -EMFILE;
10902 
10903 		data->verdict.chain = chain;
10904 		break;
10905 	default:
10906 		return -EINVAL;
10907 	}
10908 
10909 	desc->len = sizeof(data->verdict);
10910 
10911 	return 0;
10912 }
10913 
nft_verdict_uninit(const struct nft_data * data)10914 static void nft_verdict_uninit(const struct nft_data *data)
10915 {
10916 	struct nft_chain *chain;
10917 
10918 	switch (data->verdict.code) {
10919 	case NFT_JUMP:
10920 	case NFT_GOTO:
10921 		chain = data->verdict.chain;
10922 		nft_use_dec(&chain->use);
10923 		break;
10924 	}
10925 }
10926 
nft_verdict_dump(struct sk_buff * skb,int type,const struct nft_verdict * v)10927 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10928 {
10929 	struct nlattr *nest;
10930 
10931 	nest = nla_nest_start_noflag(skb, type);
10932 	if (!nest)
10933 		goto nla_put_failure;
10934 
10935 	if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10936 		goto nla_put_failure;
10937 
10938 	switch (v->code) {
10939 	case NFT_JUMP:
10940 	case NFT_GOTO:
10941 		if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10942 				   v->chain->name))
10943 			goto nla_put_failure;
10944 	}
10945 	nla_nest_end(skb, nest);
10946 	return 0;
10947 
10948 nla_put_failure:
10949 	return -1;
10950 }
10951 
nft_value_init(const struct nft_ctx * ctx,struct nft_data * data,struct nft_data_desc * desc,const struct nlattr * nla)10952 static int nft_value_init(const struct nft_ctx *ctx,
10953 			  struct nft_data *data, struct nft_data_desc *desc,
10954 			  const struct nlattr *nla)
10955 {
10956 	unsigned int len;
10957 
10958 	len = nla_len(nla);
10959 	if (len == 0)
10960 		return -EINVAL;
10961 	if (len > desc->size)
10962 		return -EOVERFLOW;
10963 	if (desc->len) {
10964 		if (len != desc->len)
10965 			return -EINVAL;
10966 	} else {
10967 		desc->len = len;
10968 	}
10969 
10970 	nla_memcpy(data->data, nla, len);
10971 
10972 	return 0;
10973 }
10974 
nft_value_dump(struct sk_buff * skb,const struct nft_data * data,unsigned int len)10975 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10976 			  unsigned int len)
10977 {
10978 	return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10979 }
10980 
10981 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10982 	[NFTA_DATA_VALUE]	= { .type = NLA_BINARY },
10983 	[NFTA_DATA_VERDICT]	= { .type = NLA_NESTED },
10984 };
10985 
10986 /**
10987  *	nft_data_init - parse nf_tables data netlink attributes
10988  *
10989  *	@ctx: context of the expression using the data
10990  *	@data: destination struct nft_data
10991  *	@desc: data description
10992  *	@nla: netlink attribute containing data
10993  *
10994  *	Parse the netlink data attributes and initialize a struct nft_data.
10995  *	The type and length of data are returned in the data description.
10996  *
10997  *	The caller can indicate that it only wants to accept data of type
10998  *	NFT_DATA_VALUE by passing NULL for the ctx argument.
10999  */
nft_data_init(const struct nft_ctx * ctx,struct nft_data * data,struct nft_data_desc * desc,const struct nlattr * nla)11000 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
11001 		  struct nft_data_desc *desc, const struct nlattr *nla)
11002 {
11003 	struct nlattr *tb[NFTA_DATA_MAX + 1];
11004 	int err;
11005 
11006 	if (WARN_ON_ONCE(!desc->size))
11007 		return -EINVAL;
11008 
11009 	err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
11010 					  nft_data_policy, NULL);
11011 	if (err < 0)
11012 		return err;
11013 
11014 	if (tb[NFTA_DATA_VALUE]) {
11015 		if (desc->type != NFT_DATA_VALUE)
11016 			return -EINVAL;
11017 
11018 		err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
11019 	} else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
11020 		if (desc->type != NFT_DATA_VERDICT)
11021 			return -EINVAL;
11022 
11023 		err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
11024 	} else {
11025 		err = -EINVAL;
11026 	}
11027 
11028 	return err;
11029 }
11030 EXPORT_SYMBOL_GPL(nft_data_init);
11031 
11032 /**
11033  *	nft_data_release - release a nft_data item
11034  *
11035  *	@data: struct nft_data to release
11036  *	@type: type of data
11037  *
11038  *	Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
11039  *	all others need to be released by calling this function.
11040  */
nft_data_release(const struct nft_data * data,enum nft_data_types type)11041 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
11042 {
11043 	if (type < NFT_DATA_VERDICT)
11044 		return;
11045 	switch (type) {
11046 	case NFT_DATA_VERDICT:
11047 		return nft_verdict_uninit(data);
11048 	default:
11049 		WARN_ON(1);
11050 	}
11051 }
11052 EXPORT_SYMBOL_GPL(nft_data_release);
11053 
nft_data_dump(struct sk_buff * skb,int attr,const struct nft_data * data,enum nft_data_types type,unsigned int len)11054 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
11055 		  enum nft_data_types type, unsigned int len)
11056 {
11057 	struct nlattr *nest;
11058 	int err;
11059 
11060 	nest = nla_nest_start_noflag(skb, attr);
11061 	if (nest == NULL)
11062 		return -1;
11063 
11064 	switch (type) {
11065 	case NFT_DATA_VALUE:
11066 		err = nft_value_dump(skb, data, len);
11067 		break;
11068 	case NFT_DATA_VERDICT:
11069 		err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
11070 		break;
11071 	default:
11072 		err = -EINVAL;
11073 		WARN_ON(1);
11074 	}
11075 
11076 	nla_nest_end(skb, nest);
11077 	return err;
11078 }
11079 EXPORT_SYMBOL_GPL(nft_data_dump);
11080 
__nft_release_basechain(struct nft_ctx * ctx)11081 int __nft_release_basechain(struct nft_ctx *ctx)
11082 {
11083 	struct nft_rule *rule, *nr;
11084 
11085 	if (WARN_ON(!nft_is_base_chain(ctx->chain)))
11086 		return 0;
11087 
11088 	nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
11089 	list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
11090 		list_del(&rule->list);
11091 		nft_use_dec(&ctx->chain->use);
11092 		nf_tables_rule_release(ctx, rule);
11093 	}
11094 	nft_chain_del(ctx->chain);
11095 	nft_use_dec(&ctx->table->use);
11096 	nf_tables_chain_destroy(ctx);
11097 
11098 	return 0;
11099 }
11100 EXPORT_SYMBOL_GPL(__nft_release_basechain);
11101 
__nft_release_hook(struct net * net,struct nft_table * table)11102 static void __nft_release_hook(struct net *net, struct nft_table *table)
11103 {
11104 	struct nft_flowtable *flowtable;
11105 	struct nft_chain *chain;
11106 
11107 	list_for_each_entry(chain, &table->chains, list)
11108 		__nf_tables_unregister_hook(net, table, chain, true);
11109 	list_for_each_entry(flowtable, &table->flowtables, list)
11110 		__nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
11111 						     true);
11112 }
11113 
__nft_release_hooks(struct net * net)11114 static void __nft_release_hooks(struct net *net)
11115 {
11116 	struct nftables_pernet *nft_net = nft_pernet(net);
11117 	struct nft_table *table;
11118 
11119 	list_for_each_entry(table, &nft_net->tables, list) {
11120 		if (nft_table_has_owner(table))
11121 			continue;
11122 
11123 		__nft_release_hook(net, table);
11124 	}
11125 }
11126 
__nft_release_table(struct net * net,struct nft_table * table)11127 static void __nft_release_table(struct net *net, struct nft_table *table)
11128 {
11129 	struct nft_flowtable *flowtable, *nf;
11130 	struct nft_chain *chain, *nc;
11131 	struct nft_object *obj, *ne;
11132 	struct nft_rule *rule, *nr;
11133 	struct nft_set *set, *ns;
11134 	struct nft_ctx ctx = {
11135 		.net	= net,
11136 		.family	= NFPROTO_NETDEV,
11137 	};
11138 
11139 	ctx.family = table->family;
11140 	ctx.table = table;
11141 	list_for_each_entry(chain, &table->chains, list) {
11142 		if (nft_chain_binding(chain))
11143 			continue;
11144 
11145 		ctx.chain = chain;
11146 		list_for_each_entry_safe(rule, nr, &chain->rules, list) {
11147 			list_del(&rule->list);
11148 			nft_use_dec(&chain->use);
11149 			nf_tables_rule_release(&ctx, rule);
11150 		}
11151 	}
11152 	list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
11153 		list_del(&flowtable->list);
11154 		nft_use_dec(&table->use);
11155 		nf_tables_flowtable_destroy(flowtable);
11156 	}
11157 	list_for_each_entry_safe(set, ns, &table->sets, list) {
11158 		list_del(&set->list);
11159 		nft_use_dec(&table->use);
11160 		if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
11161 			nft_map_deactivate(&ctx, set);
11162 
11163 		nft_set_destroy(&ctx, set);
11164 	}
11165 	list_for_each_entry_safe(obj, ne, &table->objects, list) {
11166 		nft_obj_del(obj);
11167 		nft_use_dec(&table->use);
11168 		nft_obj_destroy(&ctx, obj);
11169 	}
11170 	list_for_each_entry_safe(chain, nc, &table->chains, list) {
11171 		ctx.chain = chain;
11172 		nft_chain_del(chain);
11173 		nft_use_dec(&table->use);
11174 		nf_tables_chain_destroy(&ctx);
11175 	}
11176 	nf_tables_table_destroy(&ctx);
11177 }
11178 
__nft_release_tables(struct net * net)11179 static void __nft_release_tables(struct net *net)
11180 {
11181 	struct nftables_pernet *nft_net = nft_pernet(net);
11182 	struct nft_table *table, *nt;
11183 
11184 	list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
11185 		if (nft_table_has_owner(table))
11186 			continue;
11187 
11188 		list_del(&table->list);
11189 
11190 		__nft_release_table(net, table);
11191 	}
11192 }
11193 
nft_rcv_nl_event(struct notifier_block * this,unsigned long event,void * ptr)11194 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
11195 			    void *ptr)
11196 {
11197 	struct nft_table *table, *to_delete[8];
11198 	struct nftables_pernet *nft_net;
11199 	struct netlink_notify *n = ptr;
11200 	struct net *net = n->net;
11201 	unsigned int deleted;
11202 	bool restart = false;
11203 	unsigned int gc_seq;
11204 
11205 	if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
11206 		return NOTIFY_DONE;
11207 
11208 	nft_net = nft_pernet(net);
11209 	deleted = 0;
11210 	mutex_lock(&nft_net->commit_mutex);
11211 
11212 	gc_seq = nft_gc_seq_begin(nft_net);
11213 
11214 	nf_tables_trans_destroy_flush_work();
11215 again:
11216 	list_for_each_entry(table, &nft_net->tables, list) {
11217 		if (nft_table_has_owner(table) &&
11218 		    n->portid == table->nlpid) {
11219 			__nft_release_hook(net, table);
11220 			list_del_rcu(&table->list);
11221 			to_delete[deleted++] = table;
11222 			if (deleted >= ARRAY_SIZE(to_delete))
11223 				break;
11224 		}
11225 	}
11226 	if (deleted) {
11227 		restart = deleted >= ARRAY_SIZE(to_delete);
11228 		synchronize_rcu();
11229 		while (deleted)
11230 			__nft_release_table(net, to_delete[--deleted]);
11231 
11232 		if (restart)
11233 			goto again;
11234 	}
11235 	nft_gc_seq_end(nft_net, gc_seq);
11236 
11237 	mutex_unlock(&nft_net->commit_mutex);
11238 
11239 	return NOTIFY_DONE;
11240 }
11241 
11242 static struct notifier_block nft_nl_notifier = {
11243 	.notifier_call  = nft_rcv_nl_event,
11244 };
11245 
nf_tables_init_net(struct net * net)11246 static int __net_init nf_tables_init_net(struct net *net)
11247 {
11248 	struct nftables_pernet *nft_net = nft_pernet(net);
11249 
11250 	INIT_LIST_HEAD(&nft_net->tables);
11251 	INIT_LIST_HEAD(&nft_net->commit_list);
11252 	INIT_LIST_HEAD(&nft_net->binding_list);
11253 	INIT_LIST_HEAD(&nft_net->module_list);
11254 	INIT_LIST_HEAD(&nft_net->notify_list);
11255 	mutex_init(&nft_net->commit_mutex);
11256 	nft_net->base_seq = 1;
11257 	nft_net->gc_seq = 0;
11258 	nft_net->validate_state = NFT_VALIDATE_SKIP;
11259 
11260 	return 0;
11261 }
11262 
nf_tables_pre_exit_net(struct net * net)11263 static void __net_exit nf_tables_pre_exit_net(struct net *net)
11264 {
11265 	struct nftables_pernet *nft_net = nft_pernet(net);
11266 
11267 	mutex_lock(&nft_net->commit_mutex);
11268 	__nft_release_hooks(net);
11269 	mutex_unlock(&nft_net->commit_mutex);
11270 }
11271 
nf_tables_exit_net(struct net * net)11272 static void __net_exit nf_tables_exit_net(struct net *net)
11273 {
11274 	struct nftables_pernet *nft_net = nft_pernet(net);
11275 	unsigned int gc_seq;
11276 
11277 	mutex_lock(&nft_net->commit_mutex);
11278 
11279 	gc_seq = nft_gc_seq_begin(nft_net);
11280 
11281 	WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
11282 
11283 	if (!list_empty(&nft_net->module_list))
11284 		nf_tables_module_autoload_cleanup(net);
11285 
11286 	__nft_release_tables(net);
11287 
11288 	nft_gc_seq_end(nft_net, gc_seq);
11289 
11290 	mutex_unlock(&nft_net->commit_mutex);
11291 	WARN_ON_ONCE(!list_empty(&nft_net->tables));
11292 	WARN_ON_ONCE(!list_empty(&nft_net->module_list));
11293 	WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
11294 }
11295 
nf_tables_exit_batch(struct list_head * net_exit_list)11296 static void nf_tables_exit_batch(struct list_head *net_exit_list)
11297 {
11298 	flush_work(&trans_gc_work);
11299 }
11300 
11301 static struct pernet_operations nf_tables_net_ops = {
11302 	.init		= nf_tables_init_net,
11303 	.pre_exit	= nf_tables_pre_exit_net,
11304 	.exit		= nf_tables_exit_net,
11305 	.exit_batch	= nf_tables_exit_batch,
11306 	.id		= &nf_tables_net_id,
11307 	.size		= sizeof(struct nftables_pernet),
11308 };
11309 
nf_tables_module_init(void)11310 static int __init nf_tables_module_init(void)
11311 {
11312 	int err;
11313 
11314 	err = register_pernet_subsys(&nf_tables_net_ops);
11315 	if (err < 0)
11316 		return err;
11317 
11318 	err = nft_chain_filter_init();
11319 	if (err < 0)
11320 		goto err_chain_filter;
11321 
11322 	err = nf_tables_core_module_init();
11323 	if (err < 0)
11324 		goto err_core_module;
11325 
11326 	err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
11327 	if (err < 0)
11328 		goto err_netdev_notifier;
11329 
11330 	err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
11331 	if (err < 0)
11332 		goto err_rht_objname;
11333 
11334 	err = nft_offload_init();
11335 	if (err < 0)
11336 		goto err_offload;
11337 
11338 	err = netlink_register_notifier(&nft_nl_notifier);
11339 	if (err < 0)
11340 		goto err_netlink_notifier;
11341 
11342 	/* must be last */
11343 	err = nfnetlink_subsys_register(&nf_tables_subsys);
11344 	if (err < 0)
11345 		goto err_nfnl_subsys;
11346 
11347 	nft_chain_route_init();
11348 
11349 	return err;
11350 
11351 err_nfnl_subsys:
11352 	netlink_unregister_notifier(&nft_nl_notifier);
11353 err_netlink_notifier:
11354 	nft_offload_exit();
11355 err_offload:
11356 	rhltable_destroy(&nft_objname_ht);
11357 err_rht_objname:
11358 	unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11359 err_netdev_notifier:
11360 	nf_tables_core_module_exit();
11361 err_core_module:
11362 	nft_chain_filter_fini();
11363 err_chain_filter:
11364 	unregister_pernet_subsys(&nf_tables_net_ops);
11365 	return err;
11366 }
11367 
nf_tables_module_exit(void)11368 static void __exit nf_tables_module_exit(void)
11369 {
11370 	nfnetlink_subsys_unregister(&nf_tables_subsys);
11371 	netlink_unregister_notifier(&nft_nl_notifier);
11372 	nft_offload_exit();
11373 	unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11374 	nft_chain_filter_fini();
11375 	nft_chain_route_fini();
11376 	nf_tables_trans_destroy_flush_work();
11377 	unregister_pernet_subsys(&nf_tables_net_ops);
11378 	cancel_work_sync(&trans_gc_work);
11379 	cancel_work_sync(&trans_destroy_work);
11380 	rcu_barrier();
11381 	rhltable_destroy(&nft_objname_ht);
11382 	nf_tables_core_module_exit();
11383 }
11384 
11385 module_init(nf_tables_module_init);
11386 module_exit(nf_tables_module_exit);
11387 
11388 MODULE_LICENSE("GPL");
11389 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11390 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
11391