1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * net/sched/act_api.c Packet action API.
4 *
5 * Author: Jamal Hadi Salim
6 */
7
8 #include <linux/types.h>
9 #include <linux/kernel.h>
10 #include <linux/string.h>
11 #include <linux/errno.h>
12 #include <linux/slab.h>
13 #include <linux/skbuff.h>
14 #include <linux/init.h>
15 #include <linux/kmod.h>
16 #include <linux/err.h>
17 #include <linux/module.h>
18 #include <net/net_namespace.h>
19 #include <net/sock.h>
20 #include <net/sch_generic.h>
21 #include <net/pkt_cls.h>
22 #include <net/tc_act/tc_pedit.h>
23 #include <net/act_api.h>
24 #include <net/netlink.h>
25 #include <net/flow_offload.h>
26 #include <net/tc_wrapper.h>
27
28 #ifdef CONFIG_INET
29 DEFINE_STATIC_KEY_FALSE(tcf_frag_xmit_count);
30 EXPORT_SYMBOL_GPL(tcf_frag_xmit_count);
31 #endif
32
tcf_dev_queue_xmit(struct sk_buff * skb,int (* xmit)(struct sk_buff * skb))33 int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb))
34 {
35 #ifdef CONFIG_INET
36 if (static_branch_unlikely(&tcf_frag_xmit_count))
37 return sch_frag_xmit_hook(skb, xmit);
38 #endif
39
40 return xmit(skb);
41 }
42 EXPORT_SYMBOL_GPL(tcf_dev_queue_xmit);
43
tcf_action_goto_chain_exec(const struct tc_action * a,struct tcf_result * res)44 static void tcf_action_goto_chain_exec(const struct tc_action *a,
45 struct tcf_result *res)
46 {
47 const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain);
48
49 res->goto_tp = rcu_dereference_bh(chain->filter_chain);
50 }
51
tcf_free_cookie_rcu(struct rcu_head * p)52 static void tcf_free_cookie_rcu(struct rcu_head *p)
53 {
54 struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu);
55
56 kfree(cookie->data);
57 kfree(cookie);
58 }
59
tcf_set_action_cookie(struct tc_cookie __rcu ** old_cookie,struct tc_cookie * new_cookie)60 static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie,
61 struct tc_cookie *new_cookie)
62 {
63 struct tc_cookie *old;
64
65 old = xchg((__force struct tc_cookie **)old_cookie, new_cookie);
66 if (old)
67 call_rcu(&old->rcu, tcf_free_cookie_rcu);
68 }
69
tcf_action_check_ctrlact(int action,struct tcf_proto * tp,struct tcf_chain ** newchain,struct netlink_ext_ack * extack)70 int tcf_action_check_ctrlact(int action, struct tcf_proto *tp,
71 struct tcf_chain **newchain,
72 struct netlink_ext_ack *extack)
73 {
74 int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL;
75 u32 chain_index;
76
77 if (!opcode)
78 ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0;
79 else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC)
80 ret = 0;
81 if (ret) {
82 NL_SET_ERR_MSG(extack, "invalid control action");
83 goto end;
84 }
85
86 if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) {
87 chain_index = action & TC_ACT_EXT_VAL_MASK;
88 if (!tp || !newchain) {
89 ret = -EINVAL;
90 NL_SET_ERR_MSG(extack,
91 "can't goto NULL proto/chain");
92 goto end;
93 }
94 *newchain = tcf_chain_get_by_act(tp->chain->block, chain_index);
95 if (!*newchain) {
96 ret = -ENOMEM;
97 NL_SET_ERR_MSG(extack,
98 "can't allocate goto_chain");
99 }
100 }
101 end:
102 return ret;
103 }
104 EXPORT_SYMBOL(tcf_action_check_ctrlact);
105
tcf_action_set_ctrlact(struct tc_action * a,int action,struct tcf_chain * goto_chain)106 struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action,
107 struct tcf_chain *goto_chain)
108 {
109 a->tcfa_action = action;
110 goto_chain = rcu_replace_pointer(a->goto_chain, goto_chain, 1);
111 return goto_chain;
112 }
113 EXPORT_SYMBOL(tcf_action_set_ctrlact);
114
115 /* XXX: For standalone actions, we don't need a RCU grace period either, because
116 * actions are always connected to filters and filters are already destroyed in
117 * RCU callbacks, so after a RCU grace period actions are already disconnected
118 * from filters. Readers later can not find us.
119 */
free_tcf(struct tc_action * p)120 static void free_tcf(struct tc_action *p)
121 {
122 struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1);
123
124 free_percpu(p->cpu_bstats);
125 free_percpu(p->cpu_bstats_hw);
126 free_percpu(p->cpu_qstats);
127
128 tcf_set_action_cookie(&p->user_cookie, NULL);
129 if (chain)
130 tcf_chain_put_by_act(chain);
131
132 kfree(p);
133 }
134
offload_action_hw_count_set(struct tc_action * act,u32 hw_count)135 static void offload_action_hw_count_set(struct tc_action *act,
136 u32 hw_count)
137 {
138 act->in_hw_count = hw_count;
139 }
140
offload_action_hw_count_inc(struct tc_action * act,u32 hw_count)141 static void offload_action_hw_count_inc(struct tc_action *act,
142 u32 hw_count)
143 {
144 act->in_hw_count += hw_count;
145 }
146
offload_action_hw_count_dec(struct tc_action * act,u32 hw_count)147 static void offload_action_hw_count_dec(struct tc_action *act,
148 u32 hw_count)
149 {
150 act->in_hw_count = act->in_hw_count > hw_count ?
151 act->in_hw_count - hw_count : 0;
152 }
153
tcf_offload_act_num_actions_single(struct tc_action * act)154 static unsigned int tcf_offload_act_num_actions_single(struct tc_action *act)
155 {
156 if (is_tcf_pedit(act))
157 return tcf_pedit_nkeys(act);
158 else
159 return 1;
160 }
161
tc_act_skip_hw(u32 flags)162 static bool tc_act_skip_hw(u32 flags)
163 {
164 return (flags & TCA_ACT_FLAGS_SKIP_HW) ? true : false;
165 }
166
tc_act_skip_sw(u32 flags)167 static bool tc_act_skip_sw(u32 flags)
168 {
169 return (flags & TCA_ACT_FLAGS_SKIP_SW) ? true : false;
170 }
171
172 /* SKIP_HW and SKIP_SW are mutually exclusive flags. */
tc_act_flags_valid(u32 flags)173 static bool tc_act_flags_valid(u32 flags)
174 {
175 flags &= TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW;
176
177 return flags ^ (TCA_ACT_FLAGS_SKIP_HW | TCA_ACT_FLAGS_SKIP_SW);
178 }
179
offload_action_init(struct flow_offload_action * fl_action,struct tc_action * act,enum offload_act_command cmd,struct netlink_ext_ack * extack)180 static int offload_action_init(struct flow_offload_action *fl_action,
181 struct tc_action *act,
182 enum offload_act_command cmd,
183 struct netlink_ext_ack *extack)
184 {
185 int err;
186
187 fl_action->extack = extack;
188 fl_action->command = cmd;
189 fl_action->index = act->tcfa_index;
190 fl_action->cookie = (unsigned long)act;
191
192 if (act->ops->offload_act_setup) {
193 spin_lock_bh(&act->tcfa_lock);
194 err = act->ops->offload_act_setup(act, fl_action, NULL,
195 false, extack);
196 spin_unlock_bh(&act->tcfa_lock);
197 return err;
198 }
199
200 return -EOPNOTSUPP;
201 }
202
tcf_action_offload_cmd_ex(struct flow_offload_action * fl_act,u32 * hw_count)203 static int tcf_action_offload_cmd_ex(struct flow_offload_action *fl_act,
204 u32 *hw_count)
205 {
206 int err;
207
208 err = flow_indr_dev_setup_offload(NULL, NULL, TC_SETUP_ACT,
209 fl_act, NULL, NULL);
210 if (err < 0)
211 return err;
212
213 if (hw_count)
214 *hw_count = err;
215
216 return 0;
217 }
218
tcf_action_offload_cmd_cb_ex(struct flow_offload_action * fl_act,u32 * hw_count,flow_indr_block_bind_cb_t * cb,void * cb_priv)219 static int tcf_action_offload_cmd_cb_ex(struct flow_offload_action *fl_act,
220 u32 *hw_count,
221 flow_indr_block_bind_cb_t *cb,
222 void *cb_priv)
223 {
224 int err;
225
226 err = cb(NULL, NULL, cb_priv, TC_SETUP_ACT, NULL, fl_act, NULL);
227 if (err < 0)
228 return err;
229
230 if (hw_count)
231 *hw_count = 1;
232
233 return 0;
234 }
235
tcf_action_offload_cmd(struct flow_offload_action * fl_act,u32 * hw_count,flow_indr_block_bind_cb_t * cb,void * cb_priv)236 static int tcf_action_offload_cmd(struct flow_offload_action *fl_act,
237 u32 *hw_count,
238 flow_indr_block_bind_cb_t *cb,
239 void *cb_priv)
240 {
241 return cb ? tcf_action_offload_cmd_cb_ex(fl_act, hw_count,
242 cb, cb_priv) :
243 tcf_action_offload_cmd_ex(fl_act, hw_count);
244 }
245
tcf_action_offload_add_ex(struct tc_action * action,struct netlink_ext_ack * extack,flow_indr_block_bind_cb_t * cb,void * cb_priv)246 static int tcf_action_offload_add_ex(struct tc_action *action,
247 struct netlink_ext_ack *extack,
248 flow_indr_block_bind_cb_t *cb,
249 void *cb_priv)
250 {
251 bool skip_sw = tc_act_skip_sw(action->tcfa_flags);
252 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
253 [0] = action,
254 };
255 struct flow_offload_action *fl_action;
256 u32 in_hw_count = 0;
257 int num, err = 0;
258
259 if (tc_act_skip_hw(action->tcfa_flags))
260 return 0;
261
262 num = tcf_offload_act_num_actions_single(action);
263 fl_action = offload_action_alloc(num);
264 if (!fl_action)
265 return -ENOMEM;
266
267 err = offload_action_init(fl_action, action, FLOW_ACT_REPLACE, extack);
268 if (err)
269 goto fl_err;
270
271 err = tc_setup_action(&fl_action->action, actions, 0, extack);
272 if (err) {
273 NL_SET_ERR_MSG_MOD(extack,
274 "Failed to setup tc actions for offload");
275 goto fl_err;
276 }
277
278 err = tcf_action_offload_cmd(fl_action, &in_hw_count, cb, cb_priv);
279 if (!err)
280 cb ? offload_action_hw_count_inc(action, in_hw_count) :
281 offload_action_hw_count_set(action, in_hw_count);
282
283 if (skip_sw && !tc_act_in_hw(action))
284 err = -EINVAL;
285
286 tc_cleanup_offload_action(&fl_action->action);
287
288 fl_err:
289 kfree(fl_action);
290
291 return err;
292 }
293
294 /* offload the tc action after it is inserted */
tcf_action_offload_add(struct tc_action * action,struct netlink_ext_ack * extack)295 static int tcf_action_offload_add(struct tc_action *action,
296 struct netlink_ext_ack *extack)
297 {
298 return tcf_action_offload_add_ex(action, extack, NULL, NULL);
299 }
300
tcf_action_update_hw_stats(struct tc_action * action)301 int tcf_action_update_hw_stats(struct tc_action *action)
302 {
303 struct flow_offload_action fl_act = {};
304 int err;
305
306 err = offload_action_init(&fl_act, action, FLOW_ACT_STATS, NULL);
307 if (err)
308 return err;
309
310 err = tcf_action_offload_cmd(&fl_act, NULL, NULL, NULL);
311 if (!err) {
312 preempt_disable();
313 tcf_action_stats_update(action, fl_act.stats.bytes,
314 fl_act.stats.pkts,
315 fl_act.stats.drops,
316 fl_act.stats.lastused,
317 true);
318 preempt_enable();
319 action->used_hw_stats = fl_act.stats.used_hw_stats;
320 action->used_hw_stats_valid = true;
321 } else {
322 return -EOPNOTSUPP;
323 }
324
325 return 0;
326 }
327 EXPORT_SYMBOL(tcf_action_update_hw_stats);
328
tcf_action_offload_del_ex(struct tc_action * action,flow_indr_block_bind_cb_t * cb,void * cb_priv)329 static int tcf_action_offload_del_ex(struct tc_action *action,
330 flow_indr_block_bind_cb_t *cb,
331 void *cb_priv)
332 {
333 struct flow_offload_action fl_act = {};
334 u32 in_hw_count = 0;
335 int err = 0;
336
337 if (!tc_act_in_hw(action))
338 return 0;
339
340 err = offload_action_init(&fl_act, action, FLOW_ACT_DESTROY, NULL);
341 if (err)
342 return err;
343
344 err = tcf_action_offload_cmd(&fl_act, &in_hw_count, cb, cb_priv);
345 if (err < 0)
346 return err;
347
348 if (!cb && action->in_hw_count != in_hw_count)
349 return -EINVAL;
350
351 /* do not need to update hw state when deleting action */
352 if (cb && in_hw_count)
353 offload_action_hw_count_dec(action, in_hw_count);
354
355 return 0;
356 }
357
tcf_action_offload_del(struct tc_action * action)358 static int tcf_action_offload_del(struct tc_action *action)
359 {
360 return tcf_action_offload_del_ex(action, NULL, NULL);
361 }
362
tcf_action_cleanup(struct tc_action * p)363 static void tcf_action_cleanup(struct tc_action *p)
364 {
365 tcf_action_offload_del(p);
366 if (p->ops->cleanup)
367 p->ops->cleanup(p);
368
369 gen_kill_estimator(&p->tcfa_rate_est);
370 free_tcf(p);
371 }
372
__tcf_action_put(struct tc_action * p,bool bind)373 static int __tcf_action_put(struct tc_action *p, bool bind)
374 {
375 struct tcf_idrinfo *idrinfo = p->idrinfo;
376
377 if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) {
378 if (bind)
379 atomic_dec(&p->tcfa_bindcnt);
380 idr_remove(&idrinfo->action_idr, p->tcfa_index);
381 mutex_unlock(&idrinfo->lock);
382
383 tcf_action_cleanup(p);
384 return 1;
385 }
386
387 if (bind)
388 atomic_dec(&p->tcfa_bindcnt);
389
390 return 0;
391 }
392
__tcf_idr_release(struct tc_action * p,bool bind,bool strict)393 static int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
394 {
395 int ret = 0;
396
397 /* Release with strict==1 and bind==0 is only called through act API
398 * interface (classifiers always bind). Only case when action with
399 * positive reference count and zero bind count can exist is when it was
400 * also created with act API (unbinding last classifier will destroy the
401 * action if it was created by classifier). So only case when bind count
402 * can be changed after initial check is when unbound action is
403 * destroyed by act API while classifier binds to action with same id
404 * concurrently. This result either creation of new action(same behavior
405 * as before), or reusing existing action if concurrent process
406 * increments reference count before action is deleted. Both scenarios
407 * are acceptable.
408 */
409 if (p) {
410 if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0)
411 return -EPERM;
412
413 if (__tcf_action_put(p, bind))
414 ret = ACT_P_DELETED;
415 }
416
417 return ret;
418 }
419
tcf_idr_release(struct tc_action * a,bool bind)420 int tcf_idr_release(struct tc_action *a, bool bind)
421 {
422 const struct tc_action_ops *ops = a->ops;
423 int ret;
424
425 ret = __tcf_idr_release(a, bind, false);
426 if (ret == ACT_P_DELETED)
427 module_put(ops->owner);
428 return ret;
429 }
430 EXPORT_SYMBOL(tcf_idr_release);
431
tcf_action_shared_attrs_size(const struct tc_action * act)432 static size_t tcf_action_shared_attrs_size(const struct tc_action *act)
433 {
434 struct tc_cookie *user_cookie;
435 u32 cookie_len = 0;
436
437 rcu_read_lock();
438 user_cookie = rcu_dereference(act->user_cookie);
439
440 if (user_cookie)
441 cookie_len = nla_total_size(user_cookie->len);
442 rcu_read_unlock();
443
444 return nla_total_size(0) /* action number nested */
445 + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */
446 + cookie_len /* TCA_ACT_COOKIE */
447 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */
448 + nla_total_size(0) /* TCA_ACT_STATS nested */
449 + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */
450 /* TCA_STATS_BASIC */
451 + nla_total_size_64bit(sizeof(struct gnet_stats_basic))
452 /* TCA_STATS_PKT64 */
453 + nla_total_size_64bit(sizeof(u64))
454 /* TCA_STATS_QUEUE */
455 + nla_total_size_64bit(sizeof(struct gnet_stats_queue))
456 + nla_total_size(0) /* TCA_ACT_OPTIONS nested */
457 + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */
458 }
459
tcf_action_full_attrs_size(size_t sz)460 static size_t tcf_action_full_attrs_size(size_t sz)
461 {
462 return NLMSG_HDRLEN /* struct nlmsghdr */
463 + sizeof(struct tcamsg)
464 + nla_total_size(0) /* TCA_ACT_TAB nested */
465 + sz;
466 }
467
tcf_action_fill_size(const struct tc_action * act)468 static size_t tcf_action_fill_size(const struct tc_action *act)
469 {
470 size_t sz = tcf_action_shared_attrs_size(act);
471
472 if (act->ops->get_fill_size)
473 return act->ops->get_fill_size(act) + sz;
474 return sz;
475 }
476
477 static int
tcf_action_dump_terse(struct sk_buff * skb,struct tc_action * a,bool from_act)478 tcf_action_dump_terse(struct sk_buff *skb, struct tc_action *a, bool from_act)
479 {
480 unsigned char *b = skb_tail_pointer(skb);
481 struct tc_cookie *cookie;
482
483 if (nla_put_string(skb, TCA_ACT_KIND, a->ops->kind))
484 goto nla_put_failure;
485 if (tcf_action_copy_stats(skb, a, 0))
486 goto nla_put_failure;
487 if (from_act && nla_put_u32(skb, TCA_ACT_INDEX, a->tcfa_index))
488 goto nla_put_failure;
489
490 rcu_read_lock();
491 cookie = rcu_dereference(a->user_cookie);
492 if (cookie) {
493 if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) {
494 rcu_read_unlock();
495 goto nla_put_failure;
496 }
497 }
498 rcu_read_unlock();
499
500 return 0;
501
502 nla_put_failure:
503 nlmsg_trim(skb, b);
504 return -1;
505 }
506
tcf_dump_walker(struct tcf_idrinfo * idrinfo,struct sk_buff * skb,struct netlink_callback * cb)507 static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
508 struct netlink_callback *cb)
509 {
510 int err = 0, index = -1, s_i = 0, n_i = 0;
511 u32 act_flags = cb->args[2];
512 unsigned long jiffy_since = cb->args[3];
513 struct nlattr *nest;
514 struct idr *idr = &idrinfo->action_idr;
515 struct tc_action *p;
516 unsigned long id = 1;
517 unsigned long tmp;
518
519 mutex_lock(&idrinfo->lock);
520
521 s_i = cb->args[0];
522
523 idr_for_each_entry_ul(idr, p, tmp, id) {
524 index++;
525 if (index < s_i)
526 continue;
527 if (IS_ERR(p))
528 continue;
529
530 if (jiffy_since &&
531 time_after(jiffy_since,
532 (unsigned long)p->tcfa_tm.lastuse))
533 continue;
534
535 tcf_action_update_hw_stats(p);
536
537 nest = nla_nest_start_noflag(skb, n_i);
538 if (!nest) {
539 index--;
540 goto nla_put_failure;
541 }
542 err = (act_flags & TCA_ACT_FLAG_TERSE_DUMP) ?
543 tcf_action_dump_terse(skb, p, true) :
544 tcf_action_dump_1(skb, p, 0, 0);
545 if (err < 0) {
546 index--;
547 nlmsg_trim(skb, nest);
548 goto done;
549 }
550 nla_nest_end(skb, nest);
551 n_i++;
552 if (!(act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) &&
553 n_i >= TCA_ACT_MAX_PRIO)
554 goto done;
555 }
556 done:
557 if (index >= 0)
558 cb->args[0] = index + 1;
559
560 mutex_unlock(&idrinfo->lock);
561 if (n_i) {
562 if (act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON)
563 cb->args[1] = n_i;
564 }
565 return n_i;
566
567 nla_put_failure:
568 nla_nest_cancel(skb, nest);
569 goto done;
570 }
571
tcf_idr_release_unsafe(struct tc_action * p)572 static int tcf_idr_release_unsafe(struct tc_action *p)
573 {
574 if (atomic_read(&p->tcfa_bindcnt) > 0)
575 return -EPERM;
576
577 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
578 idr_remove(&p->idrinfo->action_idr, p->tcfa_index);
579 tcf_action_cleanup(p);
580 return ACT_P_DELETED;
581 }
582
583 return 0;
584 }
585
tcf_del_walker(struct tcf_idrinfo * idrinfo,struct sk_buff * skb,const struct tc_action_ops * ops,struct netlink_ext_ack * extack)586 static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
587 const struct tc_action_ops *ops,
588 struct netlink_ext_ack *extack)
589 {
590 struct nlattr *nest;
591 int n_i = 0;
592 int ret = -EINVAL;
593 struct idr *idr = &idrinfo->action_idr;
594 struct tc_action *p;
595 unsigned long id = 1;
596 unsigned long tmp;
597
598 nest = nla_nest_start_noflag(skb, 0);
599 if (nest == NULL)
600 goto nla_put_failure;
601 if (nla_put_string(skb, TCA_ACT_KIND, ops->kind))
602 goto nla_put_failure;
603
604 ret = 0;
605 mutex_lock(&idrinfo->lock);
606 idr_for_each_entry_ul(idr, p, tmp, id) {
607 if (IS_ERR(p))
608 continue;
609 ret = tcf_idr_release_unsafe(p);
610 if (ret == ACT_P_DELETED)
611 module_put(ops->owner);
612 else if (ret < 0)
613 break;
614 n_i++;
615 }
616 mutex_unlock(&idrinfo->lock);
617 if (ret < 0) {
618 if (n_i)
619 NL_SET_ERR_MSG(extack, "Unable to flush all TC actions");
620 else
621 goto nla_put_failure;
622 }
623
624 ret = nla_put_u32(skb, TCA_FCNT, n_i);
625 if (ret)
626 goto nla_put_failure;
627 nla_nest_end(skb, nest);
628
629 return n_i;
630 nla_put_failure:
631 nla_nest_cancel(skb, nest);
632 return ret;
633 }
634
tcf_generic_walker(struct tc_action_net * tn,struct sk_buff * skb,struct netlink_callback * cb,int type,const struct tc_action_ops * ops,struct netlink_ext_ack * extack)635 int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb,
636 struct netlink_callback *cb, int type,
637 const struct tc_action_ops *ops,
638 struct netlink_ext_ack *extack)
639 {
640 struct tcf_idrinfo *idrinfo = tn->idrinfo;
641
642 if (type == RTM_DELACTION) {
643 return tcf_del_walker(idrinfo, skb, ops, extack);
644 } else if (type == RTM_GETACTION) {
645 return tcf_dump_walker(idrinfo, skb, cb);
646 } else {
647 WARN(1, "tcf_generic_walker: unknown command %d\n", type);
648 NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command");
649 return -EINVAL;
650 }
651 }
652 EXPORT_SYMBOL(tcf_generic_walker);
653
tcf_idr_search(struct tc_action_net * tn,struct tc_action ** a,u32 index)654 int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index)
655 {
656 struct tcf_idrinfo *idrinfo = tn->idrinfo;
657 struct tc_action *p;
658
659 mutex_lock(&idrinfo->lock);
660 p = idr_find(&idrinfo->action_idr, index);
661 if (IS_ERR(p))
662 p = NULL;
663 else if (p)
664 refcount_inc(&p->tcfa_refcnt);
665 mutex_unlock(&idrinfo->lock);
666
667 if (p) {
668 *a = p;
669 return true;
670 }
671 return false;
672 }
673 EXPORT_SYMBOL(tcf_idr_search);
674
__tcf_generic_walker(struct net * net,struct sk_buff * skb,struct netlink_callback * cb,int type,const struct tc_action_ops * ops,struct netlink_ext_ack * extack)675 static int __tcf_generic_walker(struct net *net, struct sk_buff *skb,
676 struct netlink_callback *cb, int type,
677 const struct tc_action_ops *ops,
678 struct netlink_ext_ack *extack)
679 {
680 struct tc_action_net *tn = net_generic(net, ops->net_id);
681
682 if (unlikely(ops->walk))
683 return ops->walk(net, skb, cb, type, ops, extack);
684
685 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
686 }
687
__tcf_idr_search(struct net * net,const struct tc_action_ops * ops,struct tc_action ** a,u32 index)688 static int __tcf_idr_search(struct net *net,
689 const struct tc_action_ops *ops,
690 struct tc_action **a, u32 index)
691 {
692 struct tc_action_net *tn = net_generic(net, ops->net_id);
693
694 if (unlikely(ops->lookup))
695 return ops->lookup(net, a, index);
696
697 return tcf_idr_search(tn, a, index);
698 }
699
tcf_idr_delete_index(struct tcf_idrinfo * idrinfo,u32 index)700 static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index)
701 {
702 struct tc_action *p;
703 int ret = 0;
704
705 mutex_lock(&idrinfo->lock);
706 p = idr_find(&idrinfo->action_idr, index);
707 if (!p) {
708 mutex_unlock(&idrinfo->lock);
709 return -ENOENT;
710 }
711
712 if (!atomic_read(&p->tcfa_bindcnt)) {
713 if (refcount_dec_and_test(&p->tcfa_refcnt)) {
714 struct module *owner = p->ops->owner;
715
716 WARN_ON(p != idr_remove(&idrinfo->action_idr,
717 p->tcfa_index));
718 mutex_unlock(&idrinfo->lock);
719
720 tcf_action_cleanup(p);
721 module_put(owner);
722 return 0;
723 }
724 ret = 0;
725 } else {
726 ret = -EPERM;
727 }
728
729 mutex_unlock(&idrinfo->lock);
730 return ret;
731 }
732
tcf_idr_create(struct tc_action_net * tn,u32 index,struct nlattr * est,struct tc_action ** a,const struct tc_action_ops * ops,int bind,bool cpustats,u32 flags)733 int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
734 struct tc_action **a, const struct tc_action_ops *ops,
735 int bind, bool cpustats, u32 flags)
736 {
737 struct tc_action *p = kzalloc(ops->size, GFP_KERNEL);
738 struct tcf_idrinfo *idrinfo = tn->idrinfo;
739 int err = -ENOMEM;
740
741 if (unlikely(!p))
742 return -ENOMEM;
743 refcount_set(&p->tcfa_refcnt, 1);
744 if (bind)
745 atomic_set(&p->tcfa_bindcnt, 1);
746
747 if (cpustats) {
748 p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
749 if (!p->cpu_bstats)
750 goto err1;
751 p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync);
752 if (!p->cpu_bstats_hw)
753 goto err2;
754 p->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
755 if (!p->cpu_qstats)
756 goto err3;
757 }
758 gnet_stats_basic_sync_init(&p->tcfa_bstats);
759 gnet_stats_basic_sync_init(&p->tcfa_bstats_hw);
760 spin_lock_init(&p->tcfa_lock);
761 p->tcfa_index = index;
762 p->tcfa_tm.install = jiffies;
763 p->tcfa_tm.lastuse = jiffies;
764 p->tcfa_tm.firstuse = 0;
765 p->tcfa_flags = flags;
766 if (est) {
767 err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
768 &p->tcfa_rate_est,
769 &p->tcfa_lock, false, est);
770 if (err)
771 goto err4;
772 }
773
774 p->idrinfo = idrinfo;
775 __module_get(ops->owner);
776 p->ops = ops;
777 *a = p;
778 return 0;
779 err4:
780 free_percpu(p->cpu_qstats);
781 err3:
782 free_percpu(p->cpu_bstats_hw);
783 err2:
784 free_percpu(p->cpu_bstats);
785 err1:
786 kfree(p);
787 return err;
788 }
789 EXPORT_SYMBOL(tcf_idr_create);
790
tcf_idr_create_from_flags(struct tc_action_net * tn,u32 index,struct nlattr * est,struct tc_action ** a,const struct tc_action_ops * ops,int bind,u32 flags)791 int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
792 struct nlattr *est, struct tc_action **a,
793 const struct tc_action_ops *ops, int bind,
794 u32 flags)
795 {
796 /* Set cpustats according to actions flags. */
797 return tcf_idr_create(tn, index, est, a, ops, bind,
798 !(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags);
799 }
800 EXPORT_SYMBOL(tcf_idr_create_from_flags);
801
802 /* Cleanup idr index that was allocated but not initialized. */
803
tcf_idr_cleanup(struct tc_action_net * tn,u32 index)804 void tcf_idr_cleanup(struct tc_action_net *tn, u32 index)
805 {
806 struct tcf_idrinfo *idrinfo = tn->idrinfo;
807
808 mutex_lock(&idrinfo->lock);
809 /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
810 WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index)));
811 mutex_unlock(&idrinfo->lock);
812 }
813 EXPORT_SYMBOL(tcf_idr_cleanup);
814
815 /* Check if action with specified index exists. If actions is found, increments
816 * its reference and bind counters, and return 1. Otherwise insert temporary
817 * error pointer (to prevent concurrent users from inserting actions with same
818 * index) and return 0.
819 *
820 * May return -EAGAIN for binding actions in case of a parallel add/delete on
821 * the requested index.
822 */
823
tcf_idr_check_alloc(struct tc_action_net * tn,u32 * index,struct tc_action ** a,int bind)824 int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
825 struct tc_action **a, int bind)
826 {
827 struct tcf_idrinfo *idrinfo = tn->idrinfo;
828 struct tc_action *p;
829 int ret;
830 u32 max;
831
832 if (*index) {
833 rcu_read_lock();
834 p = idr_find(&idrinfo->action_idr, *index);
835
836 if (IS_ERR(p)) {
837 /* This means that another process allocated
838 * index but did not assign the pointer yet.
839 */
840 rcu_read_unlock();
841 return -EAGAIN;
842 }
843
844 if (!p) {
845 /* Empty slot, try to allocate it */
846 max = *index;
847 rcu_read_unlock();
848 goto new;
849 }
850
851 if (!refcount_inc_not_zero(&p->tcfa_refcnt)) {
852 /* Action was deleted in parallel */
853 rcu_read_unlock();
854 return -EAGAIN;
855 }
856
857 if (bind)
858 atomic_inc(&p->tcfa_bindcnt);
859 *a = p;
860
861 rcu_read_unlock();
862
863 return 1;
864 } else {
865 /* Find a slot */
866 *index = 1;
867 max = UINT_MAX;
868 }
869
870 new:
871 *a = NULL;
872
873 mutex_lock(&idrinfo->lock);
874 ret = idr_alloc_u32(&idrinfo->action_idr, ERR_PTR(-EBUSY), index, max,
875 GFP_KERNEL);
876 mutex_unlock(&idrinfo->lock);
877
878 /* N binds raced for action allocation,
879 * retry for all the ones that failed.
880 */
881 if (ret == -ENOSPC && *index == max)
882 ret = -EAGAIN;
883
884 return ret;
885 }
886 EXPORT_SYMBOL(tcf_idr_check_alloc);
887
tcf_idrinfo_destroy(const struct tc_action_ops * ops,struct tcf_idrinfo * idrinfo)888 void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
889 struct tcf_idrinfo *idrinfo)
890 {
891 struct idr *idr = &idrinfo->action_idr;
892 struct tc_action *p;
893 int ret;
894 unsigned long id = 1;
895 unsigned long tmp;
896
897 idr_for_each_entry_ul(idr, p, tmp, id) {
898 ret = __tcf_idr_release(p, false, true);
899 if (ret == ACT_P_DELETED)
900 module_put(ops->owner);
901 else if (ret < 0)
902 return;
903 }
904 idr_destroy(&idrinfo->action_idr);
905 }
906 EXPORT_SYMBOL(tcf_idrinfo_destroy);
907
908 static LIST_HEAD(act_base);
909 static DEFINE_RWLOCK(act_mod_lock);
910 /* since act ops id is stored in pernet subsystem list,
911 * then there is no way to walk through only all the action
912 * subsystem, so we keep tc action pernet ops id for
913 * reoffload to walk through.
914 */
915 static LIST_HEAD(act_pernet_id_list);
916 static DEFINE_MUTEX(act_id_mutex);
917 struct tc_act_pernet_id {
918 struct list_head list;
919 unsigned int id;
920 };
921
tcf_pernet_add_id_list(unsigned int id)922 static int tcf_pernet_add_id_list(unsigned int id)
923 {
924 struct tc_act_pernet_id *id_ptr;
925 int ret = 0;
926
927 mutex_lock(&act_id_mutex);
928 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
929 if (id_ptr->id == id) {
930 ret = -EEXIST;
931 goto err_out;
932 }
933 }
934
935 id_ptr = kzalloc(sizeof(*id_ptr), GFP_KERNEL);
936 if (!id_ptr) {
937 ret = -ENOMEM;
938 goto err_out;
939 }
940 id_ptr->id = id;
941
942 list_add_tail(&id_ptr->list, &act_pernet_id_list);
943
944 err_out:
945 mutex_unlock(&act_id_mutex);
946 return ret;
947 }
948
tcf_pernet_del_id_list(unsigned int id)949 static void tcf_pernet_del_id_list(unsigned int id)
950 {
951 struct tc_act_pernet_id *id_ptr;
952
953 mutex_lock(&act_id_mutex);
954 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
955 if (id_ptr->id == id) {
956 list_del(&id_ptr->list);
957 kfree(id_ptr);
958 break;
959 }
960 }
961 mutex_unlock(&act_id_mutex);
962 }
963
tcf_register_action(struct tc_action_ops * act,struct pernet_operations * ops)964 int tcf_register_action(struct tc_action_ops *act,
965 struct pernet_operations *ops)
966 {
967 struct tc_action_ops *a;
968 int ret;
969
970 if (!act->act || !act->dump || !act->init)
971 return -EINVAL;
972
973 /* We have to register pernet ops before making the action ops visible,
974 * otherwise tcf_action_init_1() could get a partially initialized
975 * netns.
976 */
977 ret = register_pernet_subsys(ops);
978 if (ret)
979 return ret;
980
981 if (ops->id) {
982 ret = tcf_pernet_add_id_list(*ops->id);
983 if (ret)
984 goto err_id;
985 }
986
987 write_lock(&act_mod_lock);
988 list_for_each_entry(a, &act_base, head) {
989 if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) {
990 ret = -EEXIST;
991 goto err_out;
992 }
993 }
994 list_add_tail(&act->head, &act_base);
995 write_unlock(&act_mod_lock);
996
997 return 0;
998
999 err_out:
1000 write_unlock(&act_mod_lock);
1001 if (ops->id)
1002 tcf_pernet_del_id_list(*ops->id);
1003 err_id:
1004 unregister_pernet_subsys(ops);
1005 return ret;
1006 }
1007 EXPORT_SYMBOL(tcf_register_action);
1008
tcf_unregister_action(struct tc_action_ops * act,struct pernet_operations * ops)1009 int tcf_unregister_action(struct tc_action_ops *act,
1010 struct pernet_operations *ops)
1011 {
1012 struct tc_action_ops *a;
1013 int err = -ENOENT;
1014
1015 write_lock(&act_mod_lock);
1016 list_for_each_entry(a, &act_base, head) {
1017 if (a == act) {
1018 list_del(&act->head);
1019 err = 0;
1020 break;
1021 }
1022 }
1023 write_unlock(&act_mod_lock);
1024 if (!err) {
1025 unregister_pernet_subsys(ops);
1026 if (ops->id)
1027 tcf_pernet_del_id_list(*ops->id);
1028 }
1029 return err;
1030 }
1031 EXPORT_SYMBOL(tcf_unregister_action);
1032
1033 /* lookup by name */
tc_lookup_action_n(char * kind)1034 static struct tc_action_ops *tc_lookup_action_n(char *kind)
1035 {
1036 struct tc_action_ops *a, *res = NULL;
1037
1038 if (kind) {
1039 read_lock(&act_mod_lock);
1040 list_for_each_entry(a, &act_base, head) {
1041 if (strcmp(kind, a->kind) == 0) {
1042 if (try_module_get(a->owner))
1043 res = a;
1044 break;
1045 }
1046 }
1047 read_unlock(&act_mod_lock);
1048 }
1049 return res;
1050 }
1051
1052 /* lookup by nlattr */
tc_lookup_action(struct nlattr * kind)1053 static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
1054 {
1055 struct tc_action_ops *a, *res = NULL;
1056
1057 if (kind) {
1058 read_lock(&act_mod_lock);
1059 list_for_each_entry(a, &act_base, head) {
1060 if (nla_strcmp(kind, a->kind) == 0) {
1061 if (try_module_get(a->owner))
1062 res = a;
1063 break;
1064 }
1065 }
1066 read_unlock(&act_mod_lock);
1067 }
1068 return res;
1069 }
1070
1071 /*TCA_ACT_MAX_PRIO is 32, there count up to 32 */
1072 #define TCA_ACT_MAX_PRIO_MASK 0x1FF
tcf_action_exec(struct sk_buff * skb,struct tc_action ** actions,int nr_actions,struct tcf_result * res)1073 int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
1074 int nr_actions, struct tcf_result *res)
1075 {
1076 u32 jmp_prgcnt = 0;
1077 u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */
1078 int i;
1079 int ret = TC_ACT_OK;
1080
1081 if (skb_skip_tc_classify(skb))
1082 return TC_ACT_OK;
1083
1084 restart_act_graph:
1085 for (i = 0; i < nr_actions; i++) {
1086 const struct tc_action *a = actions[i];
1087 int repeat_ttl;
1088
1089 if (jmp_prgcnt > 0) {
1090 jmp_prgcnt -= 1;
1091 continue;
1092 }
1093
1094 if (tc_act_skip_sw(a->tcfa_flags))
1095 continue;
1096
1097 repeat_ttl = 32;
1098 repeat:
1099 ret = tc_act(skb, a, res);
1100 if (unlikely(ret == TC_ACT_REPEAT)) {
1101 if (--repeat_ttl != 0)
1102 goto repeat;
1103 /* suspicious opcode, stop pipeline */
1104 net_warn_ratelimited("TC_ACT_REPEAT abuse ?\n");
1105 return TC_ACT_OK;
1106 }
1107 if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
1108 jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
1109 if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
1110 /* faulty opcode, stop pipeline */
1111 return TC_ACT_OK;
1112 } else {
1113 jmp_ttl -= 1;
1114 if (jmp_ttl > 0)
1115 goto restart_act_graph;
1116 else /* faulty graph, stop pipeline */
1117 return TC_ACT_OK;
1118 }
1119 } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
1120 if (unlikely(!rcu_access_pointer(a->goto_chain))) {
1121 net_warn_ratelimited("can't go to NULL chain!\n");
1122 return TC_ACT_SHOT;
1123 }
1124 tcf_action_goto_chain_exec(a, res);
1125 }
1126
1127 if (ret != TC_ACT_PIPE)
1128 break;
1129 }
1130
1131 return ret;
1132 }
1133 EXPORT_SYMBOL(tcf_action_exec);
1134
tcf_action_destroy(struct tc_action * actions[],int bind)1135 int tcf_action_destroy(struct tc_action *actions[], int bind)
1136 {
1137 const struct tc_action_ops *ops;
1138 struct tc_action *a;
1139 int ret = 0, i;
1140
1141 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1142 a = actions[i];
1143 actions[i] = NULL;
1144 ops = a->ops;
1145 ret = __tcf_idr_release(a, bind, true);
1146 if (ret == ACT_P_DELETED)
1147 module_put(ops->owner);
1148 else if (ret < 0)
1149 return ret;
1150 }
1151 return ret;
1152 }
1153
tcf_action_put(struct tc_action * p)1154 static int tcf_action_put(struct tc_action *p)
1155 {
1156 return __tcf_action_put(p, false);
1157 }
1158
1159 /* Put all actions in this array, skip those NULL's. */
tcf_action_put_many(struct tc_action * actions[])1160 static void tcf_action_put_many(struct tc_action *actions[])
1161 {
1162 int i;
1163
1164 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
1165 struct tc_action *a = actions[i];
1166 const struct tc_action_ops *ops;
1167
1168 if (!a)
1169 continue;
1170 ops = a->ops;
1171 if (tcf_action_put(a))
1172 module_put(ops->owner);
1173 }
1174 }
1175
1176 int
tcf_action_dump_old(struct sk_buff * skb,struct tc_action * a,int bind,int ref)1177 tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
1178 {
1179 return a->ops->dump(skb, a, bind, ref);
1180 }
1181
1182 int
tcf_action_dump_1(struct sk_buff * skb,struct tc_action * a,int bind,int ref)1183 tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
1184 {
1185 int err = -EINVAL;
1186 unsigned char *b = skb_tail_pointer(skb);
1187 struct nlattr *nest;
1188 u32 flags;
1189
1190 if (tcf_action_dump_terse(skb, a, false))
1191 goto nla_put_failure;
1192
1193 if (a->hw_stats != TCA_ACT_HW_STATS_ANY &&
1194 nla_put_bitfield32(skb, TCA_ACT_HW_STATS,
1195 a->hw_stats, TCA_ACT_HW_STATS_ANY))
1196 goto nla_put_failure;
1197
1198 if (a->used_hw_stats_valid &&
1199 nla_put_bitfield32(skb, TCA_ACT_USED_HW_STATS,
1200 a->used_hw_stats, TCA_ACT_HW_STATS_ANY))
1201 goto nla_put_failure;
1202
1203 flags = a->tcfa_flags & TCA_ACT_FLAGS_USER_MASK;
1204 if (flags &&
1205 nla_put_bitfield32(skb, TCA_ACT_FLAGS,
1206 flags, flags))
1207 goto nla_put_failure;
1208
1209 if (nla_put_u32(skb, TCA_ACT_IN_HW_COUNT, a->in_hw_count))
1210 goto nla_put_failure;
1211
1212 nest = nla_nest_start_noflag(skb, TCA_ACT_OPTIONS);
1213 if (nest == NULL)
1214 goto nla_put_failure;
1215 err = tcf_action_dump_old(skb, a, bind, ref);
1216 if (err > 0) {
1217 nla_nest_end(skb, nest);
1218 return err;
1219 }
1220
1221 nla_put_failure:
1222 nlmsg_trim(skb, b);
1223 return -1;
1224 }
1225 EXPORT_SYMBOL(tcf_action_dump_1);
1226
tcf_action_dump(struct sk_buff * skb,struct tc_action * actions[],int bind,int ref,bool terse)1227 int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[],
1228 int bind, int ref, bool terse)
1229 {
1230 struct tc_action *a;
1231 int err = -EINVAL, i;
1232 struct nlattr *nest;
1233
1234 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1235 a = actions[i];
1236 nest = nla_nest_start_noflag(skb, i + 1);
1237 if (nest == NULL)
1238 goto nla_put_failure;
1239 err = terse ? tcf_action_dump_terse(skb, a, false) :
1240 tcf_action_dump_1(skb, a, bind, ref);
1241 if (err < 0)
1242 goto errout;
1243 nla_nest_end(skb, nest);
1244 }
1245
1246 return 0;
1247
1248 nla_put_failure:
1249 err = -EINVAL;
1250 errout:
1251 nla_nest_cancel(skb, nest);
1252 return err;
1253 }
1254
nla_memdup_cookie(struct nlattr ** tb)1255 static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb)
1256 {
1257 struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL);
1258 if (!c)
1259 return NULL;
1260
1261 c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL);
1262 if (!c->data) {
1263 kfree(c);
1264 return NULL;
1265 }
1266 c->len = nla_len(tb[TCA_ACT_COOKIE]);
1267
1268 return c;
1269 }
1270
tcf_action_hw_stats_get(struct nlattr * hw_stats_attr)1271 static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr)
1272 {
1273 struct nla_bitfield32 hw_stats_bf;
1274
1275 /* If the user did not pass the attr, that means he does
1276 * not care about the type. Return "any" in that case
1277 * which is setting on all supported types.
1278 */
1279 if (!hw_stats_attr)
1280 return TCA_ACT_HW_STATS_ANY;
1281 hw_stats_bf = nla_get_bitfield32(hw_stats_attr);
1282 return hw_stats_bf.value;
1283 }
1284
1285 static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
1286 [TCA_ACT_KIND] = { .type = NLA_STRING },
1287 [TCA_ACT_INDEX] = { .type = NLA_U32 },
1288 [TCA_ACT_COOKIE] = { .type = NLA_BINARY,
1289 .len = TC_COOKIE_MAX_SIZE },
1290 [TCA_ACT_OPTIONS] = { .type = NLA_NESTED },
1291 [TCA_ACT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS |
1292 TCA_ACT_FLAGS_SKIP_HW |
1293 TCA_ACT_FLAGS_SKIP_SW),
1294 [TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY),
1295 };
1296
tcf_idr_insert_many(struct tc_action * actions[])1297 void tcf_idr_insert_many(struct tc_action *actions[])
1298 {
1299 int i;
1300
1301 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
1302 struct tc_action *a = actions[i];
1303 struct tcf_idrinfo *idrinfo;
1304
1305 if (!a)
1306 continue;
1307 idrinfo = a->idrinfo;
1308 mutex_lock(&idrinfo->lock);
1309 /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc if
1310 * it is just created, otherwise this is just a nop.
1311 */
1312 idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
1313 mutex_unlock(&idrinfo->lock);
1314 }
1315 }
1316
tc_action_load_ops(struct nlattr * nla,bool police,bool rtnl_held,struct netlink_ext_ack * extack)1317 struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, bool police,
1318 bool rtnl_held,
1319 struct netlink_ext_ack *extack)
1320 {
1321 struct nlattr *tb[TCA_ACT_MAX + 1];
1322 struct tc_action_ops *a_o;
1323 char act_name[IFNAMSIZ];
1324 struct nlattr *kind;
1325 int err;
1326
1327 if (!police) {
1328 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1329 tcf_action_policy, extack);
1330 if (err < 0)
1331 return ERR_PTR(err);
1332 err = -EINVAL;
1333 kind = tb[TCA_ACT_KIND];
1334 if (!kind) {
1335 NL_SET_ERR_MSG(extack, "TC action kind must be specified");
1336 return ERR_PTR(err);
1337 }
1338 if (nla_strscpy(act_name, kind, IFNAMSIZ) < 0) {
1339 NL_SET_ERR_MSG(extack, "TC action name too long");
1340 return ERR_PTR(err);
1341 }
1342 } else {
1343 if (strscpy(act_name, "police", IFNAMSIZ) < 0) {
1344 NL_SET_ERR_MSG(extack, "TC action name too long");
1345 return ERR_PTR(-EINVAL);
1346 }
1347 }
1348
1349 a_o = tc_lookup_action_n(act_name);
1350 if (a_o == NULL) {
1351 #ifdef CONFIG_MODULES
1352 if (rtnl_held)
1353 rtnl_unlock();
1354 request_module("act_%s", act_name);
1355 if (rtnl_held)
1356 rtnl_lock();
1357
1358 a_o = tc_lookup_action_n(act_name);
1359
1360 /* We dropped the RTNL semaphore in order to
1361 * perform the module load. So, even if we
1362 * succeeded in loading the module we have to
1363 * tell the caller to replay the request. We
1364 * indicate this using -EAGAIN.
1365 */
1366 if (a_o != NULL) {
1367 module_put(a_o->owner);
1368 return ERR_PTR(-EAGAIN);
1369 }
1370 #endif
1371 NL_SET_ERR_MSG(extack, "Failed to load TC action module");
1372 return ERR_PTR(-ENOENT);
1373 }
1374
1375 return a_o;
1376 }
1377
tcf_action_init_1(struct net * net,struct tcf_proto * tp,struct nlattr * nla,struct nlattr * est,struct tc_action_ops * a_o,int * init_res,u32 flags,struct netlink_ext_ack * extack)1378 struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
1379 struct nlattr *nla, struct nlattr *est,
1380 struct tc_action_ops *a_o, int *init_res,
1381 u32 flags, struct netlink_ext_ack *extack)
1382 {
1383 bool police = flags & TCA_ACT_FLAGS_POLICE;
1384 struct nla_bitfield32 userflags = { 0, 0 };
1385 struct tc_cookie *user_cookie = NULL;
1386 u8 hw_stats = TCA_ACT_HW_STATS_ANY;
1387 struct nlattr *tb[TCA_ACT_MAX + 1];
1388 struct tc_action *a;
1389 int err;
1390
1391 /* backward compatibility for policer */
1392 if (!police) {
1393 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1394 tcf_action_policy, extack);
1395 if (err < 0)
1396 return ERR_PTR(err);
1397 if (tb[TCA_ACT_COOKIE]) {
1398 user_cookie = nla_memdup_cookie(tb);
1399 if (!user_cookie) {
1400 NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
1401 err = -ENOMEM;
1402 goto err_out;
1403 }
1404 }
1405 hw_stats = tcf_action_hw_stats_get(tb[TCA_ACT_HW_STATS]);
1406 if (tb[TCA_ACT_FLAGS]) {
1407 userflags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]);
1408 if (!tc_act_flags_valid(userflags.value)) {
1409 err = -EINVAL;
1410 goto err_out;
1411 }
1412 }
1413
1414 err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp,
1415 userflags.value | flags, extack);
1416 } else {
1417 err = a_o->init(net, nla, est, &a, tp, userflags.value | flags,
1418 extack);
1419 }
1420 if (err < 0)
1421 goto err_out;
1422 *init_res = err;
1423
1424 if (!police && tb[TCA_ACT_COOKIE])
1425 tcf_set_action_cookie(&a->user_cookie, user_cookie);
1426
1427 if (!police)
1428 a->hw_stats = hw_stats;
1429
1430 return a;
1431
1432 err_out:
1433 if (user_cookie) {
1434 kfree(user_cookie->data);
1435 kfree(user_cookie);
1436 }
1437 return ERR_PTR(err);
1438 }
1439
tc_act_bind(u32 flags)1440 static bool tc_act_bind(u32 flags)
1441 {
1442 return !!(flags & TCA_ACT_FLAGS_BIND);
1443 }
1444
1445 /* Returns numbers of initialized actions or negative error. */
1446
tcf_action_init(struct net * net,struct tcf_proto * tp,struct nlattr * nla,struct nlattr * est,struct tc_action * actions[],int init_res[],size_t * attr_size,u32 flags,u32 fl_flags,struct netlink_ext_ack * extack)1447 int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
1448 struct nlattr *est, struct tc_action *actions[],
1449 int init_res[], size_t *attr_size,
1450 u32 flags, u32 fl_flags,
1451 struct netlink_ext_ack *extack)
1452 {
1453 struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {};
1454 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1455 struct tc_action *act;
1456 size_t sz = 0;
1457 int err;
1458 int i;
1459
1460 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1461 extack);
1462 if (err < 0)
1463 return err;
1464
1465 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1466 struct tc_action_ops *a_o;
1467
1468 a_o = tc_action_load_ops(tb[i], flags & TCA_ACT_FLAGS_POLICE,
1469 !(flags & TCA_ACT_FLAGS_NO_RTNL),
1470 extack);
1471 if (IS_ERR(a_o)) {
1472 err = PTR_ERR(a_o);
1473 goto err_mod;
1474 }
1475 ops[i - 1] = a_o;
1476 }
1477
1478 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1479 act = tcf_action_init_1(net, tp, tb[i], est, ops[i - 1],
1480 &init_res[i - 1], flags, extack);
1481 if (IS_ERR(act)) {
1482 err = PTR_ERR(act);
1483 goto err;
1484 }
1485 sz += tcf_action_fill_size(act);
1486 /* Start from index 0 */
1487 actions[i - 1] = act;
1488 if (tc_act_bind(flags)) {
1489 bool skip_sw = tc_skip_sw(fl_flags);
1490 bool skip_hw = tc_skip_hw(fl_flags);
1491
1492 if (tc_act_bind(act->tcfa_flags))
1493 continue;
1494 if (skip_sw != tc_act_skip_sw(act->tcfa_flags) ||
1495 skip_hw != tc_act_skip_hw(act->tcfa_flags)) {
1496 NL_SET_ERR_MSG(extack,
1497 "Mismatch between action and filter offload flags");
1498 err = -EINVAL;
1499 goto err;
1500 }
1501 } else {
1502 err = tcf_action_offload_add(act, extack);
1503 if (tc_act_skip_sw(act->tcfa_flags) && err)
1504 goto err;
1505 }
1506 }
1507
1508 /* We have to commit them all together, because if any error happened in
1509 * between, we could not handle the failure gracefully.
1510 */
1511 tcf_idr_insert_many(actions);
1512
1513 *attr_size = tcf_action_full_attrs_size(sz);
1514 err = i - 1;
1515 goto err_mod;
1516
1517 err:
1518 tcf_action_destroy(actions, flags & TCA_ACT_FLAGS_BIND);
1519 err_mod:
1520 for (i = 0; i < TCA_ACT_MAX_PRIO; i++) {
1521 if (ops[i])
1522 module_put(ops[i]->owner);
1523 }
1524 return err;
1525 }
1526
tcf_action_update_stats(struct tc_action * a,u64 bytes,u64 packets,u64 drops,bool hw)1527 void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets,
1528 u64 drops, bool hw)
1529 {
1530 if (a->cpu_bstats) {
1531 _bstats_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
1532
1533 this_cpu_ptr(a->cpu_qstats)->drops += drops;
1534
1535 if (hw)
1536 _bstats_update(this_cpu_ptr(a->cpu_bstats_hw),
1537 bytes, packets);
1538 return;
1539 }
1540
1541 _bstats_update(&a->tcfa_bstats, bytes, packets);
1542 a->tcfa_qstats.drops += drops;
1543 if (hw)
1544 _bstats_update(&a->tcfa_bstats_hw, bytes, packets);
1545 }
1546 EXPORT_SYMBOL(tcf_action_update_stats);
1547
tcf_action_copy_stats(struct sk_buff * skb,struct tc_action * p,int compat_mode)1548 int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
1549 int compat_mode)
1550 {
1551 int err = 0;
1552 struct gnet_dump d;
1553
1554 if (p == NULL)
1555 goto errout;
1556
1557 /* compat_mode being true specifies a call that is supposed
1558 * to add additional backward compatibility statistic TLVs.
1559 */
1560 if (compat_mode) {
1561 if (p->type == TCA_OLD_COMPAT)
1562 err = gnet_stats_start_copy_compat(skb, 0,
1563 TCA_STATS,
1564 TCA_XSTATS,
1565 &p->tcfa_lock, &d,
1566 TCA_PAD);
1567 else
1568 return 0;
1569 } else
1570 err = gnet_stats_start_copy(skb, TCA_ACT_STATS,
1571 &p->tcfa_lock, &d, TCA_ACT_PAD);
1572
1573 if (err < 0)
1574 goto errout;
1575
1576 if (gnet_stats_copy_basic(&d, p->cpu_bstats,
1577 &p->tcfa_bstats, false) < 0 ||
1578 gnet_stats_copy_basic_hw(&d, p->cpu_bstats_hw,
1579 &p->tcfa_bstats_hw, false) < 0 ||
1580 gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
1581 gnet_stats_copy_queue(&d, p->cpu_qstats,
1582 &p->tcfa_qstats,
1583 p->tcfa_qstats.qlen) < 0)
1584 goto errout;
1585
1586 if (gnet_stats_finish_copy(&d) < 0)
1587 goto errout;
1588
1589 return 0;
1590
1591 errout:
1592 return -1;
1593 }
1594
tca_get_fill(struct sk_buff * skb,struct tc_action * actions[],u32 portid,u32 seq,u16 flags,int event,int bind,int ref,struct netlink_ext_ack * extack)1595 static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[],
1596 u32 portid, u32 seq, u16 flags, int event, int bind,
1597 int ref, struct netlink_ext_ack *extack)
1598 {
1599 struct tcamsg *t;
1600 struct nlmsghdr *nlh;
1601 unsigned char *b = skb_tail_pointer(skb);
1602 struct nlattr *nest;
1603
1604 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags);
1605 if (!nlh)
1606 goto out_nlmsg_trim;
1607 t = nlmsg_data(nlh);
1608 t->tca_family = AF_UNSPEC;
1609 t->tca__pad1 = 0;
1610 t->tca__pad2 = 0;
1611
1612 if (extack && extack->_msg &&
1613 nla_put_string(skb, TCA_ROOT_EXT_WARN_MSG, extack->_msg))
1614 goto out_nlmsg_trim;
1615
1616 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1617 if (!nest)
1618 goto out_nlmsg_trim;
1619
1620 if (tcf_action_dump(skb, actions, bind, ref, false) < 0)
1621 goto out_nlmsg_trim;
1622
1623 nla_nest_end(skb, nest);
1624
1625 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1626
1627 return skb->len;
1628
1629 out_nlmsg_trim:
1630 nlmsg_trim(skb, b);
1631 return -1;
1632 }
1633
1634 static int
tcf_get_notify(struct net * net,u32 portid,struct nlmsghdr * n,struct tc_action * actions[],int event,struct netlink_ext_ack * extack)1635 tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
1636 struct tc_action *actions[], int event,
1637 struct netlink_ext_ack *extack)
1638 {
1639 struct sk_buff *skb;
1640
1641 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1642 if (!skb)
1643 return -ENOBUFS;
1644 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event,
1645 0, 1, NULL) <= 0) {
1646 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1647 kfree_skb(skb);
1648 return -EINVAL;
1649 }
1650
1651 return rtnl_unicast(skb, net, portid);
1652 }
1653
tcf_action_get_1(struct net * net,struct nlattr * nla,struct nlmsghdr * n,u32 portid,struct netlink_ext_ack * extack)1654 static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla,
1655 struct nlmsghdr *n, u32 portid,
1656 struct netlink_ext_ack *extack)
1657 {
1658 struct nlattr *tb[TCA_ACT_MAX + 1];
1659 const struct tc_action_ops *ops;
1660 struct tc_action *a;
1661 int index;
1662 int err;
1663
1664 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1665 tcf_action_policy, extack);
1666 if (err < 0)
1667 goto err_out;
1668
1669 err = -EINVAL;
1670 if (tb[TCA_ACT_INDEX] == NULL ||
1671 nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) {
1672 NL_SET_ERR_MSG(extack, "Invalid TC action index value");
1673 goto err_out;
1674 }
1675 index = nla_get_u32(tb[TCA_ACT_INDEX]);
1676
1677 err = -EINVAL;
1678 ops = tc_lookup_action(tb[TCA_ACT_KIND]);
1679 if (!ops) { /* could happen in batch of actions */
1680 NL_SET_ERR_MSG(extack, "Specified TC action kind not found");
1681 goto err_out;
1682 }
1683 err = -ENOENT;
1684 if (__tcf_idr_search(net, ops, &a, index) == 0) {
1685 NL_SET_ERR_MSG(extack, "TC action with specified index not found");
1686 goto err_mod;
1687 }
1688
1689 module_put(ops->owner);
1690 return a;
1691
1692 err_mod:
1693 module_put(ops->owner);
1694 err_out:
1695 return ERR_PTR(err);
1696 }
1697
tca_action_flush(struct net * net,struct nlattr * nla,struct nlmsghdr * n,u32 portid,struct netlink_ext_ack * extack)1698 static int tca_action_flush(struct net *net, struct nlattr *nla,
1699 struct nlmsghdr *n, u32 portid,
1700 struct netlink_ext_ack *extack)
1701 {
1702 struct sk_buff *skb;
1703 unsigned char *b;
1704 struct nlmsghdr *nlh;
1705 struct tcamsg *t;
1706 struct netlink_callback dcb;
1707 struct nlattr *nest;
1708 struct nlattr *tb[TCA_ACT_MAX + 1];
1709 const struct tc_action_ops *ops;
1710 struct nlattr *kind;
1711 int err = -ENOMEM;
1712
1713 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1714 if (!skb)
1715 return err;
1716
1717 b = skb_tail_pointer(skb);
1718
1719 err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
1720 tcf_action_policy, extack);
1721 if (err < 0)
1722 goto err_out;
1723
1724 err = -EINVAL;
1725 kind = tb[TCA_ACT_KIND];
1726 ops = tc_lookup_action(kind);
1727 if (!ops) { /*some idjot trying to flush unknown action */
1728 NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action");
1729 goto err_out;
1730 }
1731
1732 nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION,
1733 sizeof(*t), 0);
1734 if (!nlh) {
1735 NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification");
1736 goto out_module_put;
1737 }
1738 t = nlmsg_data(nlh);
1739 t->tca_family = AF_UNSPEC;
1740 t->tca__pad1 = 0;
1741 t->tca__pad2 = 0;
1742
1743 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
1744 if (!nest) {
1745 NL_SET_ERR_MSG(extack, "Failed to add new netlink message");
1746 goto out_module_put;
1747 }
1748
1749 err = __tcf_generic_walker(net, skb, &dcb, RTM_DELACTION, ops, extack);
1750 if (err <= 0) {
1751 nla_nest_cancel(skb, nest);
1752 goto out_module_put;
1753 }
1754
1755 nla_nest_end(skb, nest);
1756
1757 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1758 nlh->nlmsg_flags |= NLM_F_ROOT;
1759 module_put(ops->owner);
1760 err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1761 n->nlmsg_flags & NLM_F_ECHO);
1762 if (err < 0)
1763 NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification");
1764
1765 return err;
1766
1767 out_module_put:
1768 module_put(ops->owner);
1769 err_out:
1770 kfree_skb(skb);
1771 return err;
1772 }
1773
tcf_action_delete(struct net * net,struct tc_action * actions[])1774 static int tcf_action_delete(struct net *net, struct tc_action *actions[])
1775 {
1776 int i;
1777
1778 for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) {
1779 struct tc_action *a = actions[i];
1780 const struct tc_action_ops *ops = a->ops;
1781 /* Actions can be deleted concurrently so we must save their
1782 * type and id to search again after reference is released.
1783 */
1784 struct tcf_idrinfo *idrinfo = a->idrinfo;
1785 u32 act_index = a->tcfa_index;
1786
1787 actions[i] = NULL;
1788 if (tcf_action_put(a)) {
1789 /* last reference, action was deleted concurrently */
1790 module_put(ops->owner);
1791 } else {
1792 int ret;
1793
1794 /* now do the delete */
1795 ret = tcf_idr_delete_index(idrinfo, act_index);
1796 if (ret < 0)
1797 return ret;
1798 }
1799 }
1800 return 0;
1801 }
1802
1803 static int
tcf_reoffload_del_notify(struct net * net,struct tc_action * action)1804 tcf_reoffload_del_notify(struct net *net, struct tc_action *action)
1805 {
1806 size_t attr_size = tcf_action_fill_size(action);
1807 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {
1808 [0] = action,
1809 };
1810 const struct tc_action_ops *ops = action->ops;
1811 struct sk_buff *skb;
1812 int ret;
1813
1814 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1815 GFP_KERNEL);
1816 if (!skb)
1817 return -ENOBUFS;
1818
1819 if (tca_get_fill(skb, actions, 0, 0, 0, RTM_DELACTION, 0, 1, NULL) <= 0) {
1820 kfree_skb(skb);
1821 return -EINVAL;
1822 }
1823
1824 ret = tcf_idr_release_unsafe(action);
1825 if (ret == ACT_P_DELETED) {
1826 module_put(ops->owner);
1827 ret = rtnetlink_send(skb, net, 0, RTNLGRP_TC, 0);
1828 } else {
1829 kfree_skb(skb);
1830 }
1831
1832 return ret;
1833 }
1834
tcf_action_reoffload_cb(flow_indr_block_bind_cb_t * cb,void * cb_priv,bool add)1835 int tcf_action_reoffload_cb(flow_indr_block_bind_cb_t *cb,
1836 void *cb_priv, bool add)
1837 {
1838 struct tc_act_pernet_id *id_ptr;
1839 struct tcf_idrinfo *idrinfo;
1840 struct tc_action_net *tn;
1841 struct tc_action *p;
1842 unsigned int act_id;
1843 unsigned long tmp;
1844 unsigned long id;
1845 struct idr *idr;
1846 struct net *net;
1847 int ret;
1848
1849 if (!cb)
1850 return -EINVAL;
1851
1852 down_read(&net_rwsem);
1853 mutex_lock(&act_id_mutex);
1854
1855 for_each_net(net) {
1856 list_for_each_entry(id_ptr, &act_pernet_id_list, list) {
1857 act_id = id_ptr->id;
1858 tn = net_generic(net, act_id);
1859 if (!tn)
1860 continue;
1861 idrinfo = tn->idrinfo;
1862 if (!idrinfo)
1863 continue;
1864
1865 mutex_lock(&idrinfo->lock);
1866 idr = &idrinfo->action_idr;
1867 idr_for_each_entry_ul(idr, p, tmp, id) {
1868 if (IS_ERR(p) || tc_act_bind(p->tcfa_flags))
1869 continue;
1870 if (add) {
1871 tcf_action_offload_add_ex(p, NULL, cb,
1872 cb_priv);
1873 continue;
1874 }
1875
1876 /* cb unregister to update hw count */
1877 ret = tcf_action_offload_del_ex(p, cb, cb_priv);
1878 if (ret < 0)
1879 continue;
1880 if (tc_act_skip_sw(p->tcfa_flags) &&
1881 !tc_act_in_hw(p))
1882 tcf_reoffload_del_notify(net, p);
1883 }
1884 mutex_unlock(&idrinfo->lock);
1885 }
1886 }
1887 mutex_unlock(&act_id_mutex);
1888 up_read(&net_rwsem);
1889
1890 return 0;
1891 }
1892
1893 static int
tcf_del_notify(struct net * net,struct nlmsghdr * n,struct tc_action * actions[],u32 portid,size_t attr_size,struct netlink_ext_ack * extack)1894 tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1895 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1896 {
1897 int ret;
1898 struct sk_buff *skb;
1899
1900 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1901 GFP_KERNEL);
1902 if (!skb)
1903 return -ENOBUFS;
1904
1905 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION,
1906 0, 2, extack) <= 0) {
1907 NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes");
1908 kfree_skb(skb);
1909 return -EINVAL;
1910 }
1911
1912 /* now do the delete */
1913 ret = tcf_action_delete(net, actions);
1914 if (ret < 0) {
1915 NL_SET_ERR_MSG(extack, "Failed to delete TC action");
1916 kfree_skb(skb);
1917 return ret;
1918 }
1919
1920 ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1921 n->nlmsg_flags & NLM_F_ECHO);
1922 return ret;
1923 }
1924
1925 static int
tca_action_gd(struct net * net,struct nlattr * nla,struct nlmsghdr * n,u32 portid,int event,struct netlink_ext_ack * extack)1926 tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
1927 u32 portid, int event, struct netlink_ext_ack *extack)
1928 {
1929 int i, ret;
1930 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
1931 struct tc_action *act;
1932 size_t attr_size = 0;
1933 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
1934
1935 ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL,
1936 extack);
1937 if (ret < 0)
1938 return ret;
1939
1940 if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) {
1941 if (tb[1])
1942 return tca_action_flush(net, tb[1], n, portid, extack);
1943
1944 NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action");
1945 return -EINVAL;
1946 }
1947
1948 for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
1949 act = tcf_action_get_1(net, tb[i], n, portid, extack);
1950 if (IS_ERR(act)) {
1951 ret = PTR_ERR(act);
1952 goto err;
1953 }
1954 attr_size += tcf_action_fill_size(act);
1955 actions[i - 1] = act;
1956 }
1957
1958 attr_size = tcf_action_full_attrs_size(attr_size);
1959
1960 if (event == RTM_GETACTION)
1961 ret = tcf_get_notify(net, portid, n, actions, event, extack);
1962 else { /* delete */
1963 ret = tcf_del_notify(net, n, actions, portid, attr_size, extack);
1964 if (ret)
1965 goto err;
1966 return 0;
1967 }
1968 err:
1969 tcf_action_put_many(actions);
1970 return ret;
1971 }
1972
1973 static int
tcf_add_notify(struct net * net,struct nlmsghdr * n,struct tc_action * actions[],u32 portid,size_t attr_size,struct netlink_ext_ack * extack)1974 tcf_add_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[],
1975 u32 portid, size_t attr_size, struct netlink_ext_ack *extack)
1976 {
1977 struct sk_buff *skb;
1978
1979 skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size,
1980 GFP_KERNEL);
1981 if (!skb)
1982 return -ENOBUFS;
1983
1984 if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags,
1985 RTM_NEWACTION, 0, 0, extack) <= 0) {
1986 NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action");
1987 kfree_skb(skb);
1988 return -EINVAL;
1989 }
1990
1991 return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
1992 n->nlmsg_flags & NLM_F_ECHO);
1993 }
1994
tcf_action_add(struct net * net,struct nlattr * nla,struct nlmsghdr * n,u32 portid,u32 flags,struct netlink_ext_ack * extack)1995 static int tcf_action_add(struct net *net, struct nlattr *nla,
1996 struct nlmsghdr *n, u32 portid, u32 flags,
1997 struct netlink_ext_ack *extack)
1998 {
1999 size_t attr_size = 0;
2000 int loop, ret, i;
2001 struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
2002 int init_res[TCA_ACT_MAX_PRIO] = {};
2003
2004 for (loop = 0; loop < 10; loop++) {
2005 ret = tcf_action_init(net, NULL, nla, NULL, actions, init_res,
2006 &attr_size, flags, 0, extack);
2007 if (ret != -EAGAIN)
2008 break;
2009 }
2010
2011 if (ret < 0)
2012 return ret;
2013 ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
2014
2015 /* only put existing actions */
2016 for (i = 0; i < TCA_ACT_MAX_PRIO; i++)
2017 if (init_res[i] == ACT_P_CREATED)
2018 actions[i] = NULL;
2019 tcf_action_put_many(actions);
2020
2021 return ret;
2022 }
2023
2024 static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = {
2025 [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON |
2026 TCA_ACT_FLAG_TERSE_DUMP),
2027 [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 },
2028 };
2029
tc_ctl_action(struct sk_buff * skb,struct nlmsghdr * n,struct netlink_ext_ack * extack)2030 static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n,
2031 struct netlink_ext_ack *extack)
2032 {
2033 struct net *net = sock_net(skb->sk);
2034 struct nlattr *tca[TCA_ROOT_MAX + 1];
2035 u32 portid = NETLINK_CB(skb).portid;
2036 u32 flags = 0;
2037 int ret = 0;
2038
2039 if ((n->nlmsg_type != RTM_GETACTION) &&
2040 !netlink_capable(skb, CAP_NET_ADMIN))
2041 return -EPERM;
2042
2043 ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca,
2044 TCA_ROOT_MAX, NULL, extack);
2045 if (ret < 0)
2046 return ret;
2047
2048 if (tca[TCA_ACT_TAB] == NULL) {
2049 NL_SET_ERR_MSG(extack, "Netlink action attributes missing");
2050 return -EINVAL;
2051 }
2052
2053 /* n->nlmsg_flags & NLM_F_CREATE */
2054 switch (n->nlmsg_type) {
2055 case RTM_NEWACTION:
2056 /* we are going to assume all other flags
2057 * imply create only if it doesn't exist
2058 * Note that CREATE | EXCL implies that
2059 * but since we want avoid ambiguity (eg when flags
2060 * is zero) then just set this
2061 */
2062 if (n->nlmsg_flags & NLM_F_REPLACE)
2063 flags = TCA_ACT_FLAGS_REPLACE;
2064 ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, flags,
2065 extack);
2066 break;
2067 case RTM_DELACTION:
2068 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
2069 portid, RTM_DELACTION, extack);
2070 break;
2071 case RTM_GETACTION:
2072 ret = tca_action_gd(net, tca[TCA_ACT_TAB], n,
2073 portid, RTM_GETACTION, extack);
2074 break;
2075 default:
2076 BUG();
2077 }
2078
2079 return ret;
2080 }
2081
find_dump_kind(struct nlattr ** nla)2082 static struct nlattr *find_dump_kind(struct nlattr **nla)
2083 {
2084 struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1];
2085 struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
2086 struct nlattr *kind;
2087
2088 tb1 = nla[TCA_ACT_TAB];
2089 if (tb1 == NULL)
2090 return NULL;
2091
2092 if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0)
2093 return NULL;
2094
2095 if (tb[1] == NULL)
2096 return NULL;
2097 if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0)
2098 return NULL;
2099 kind = tb2[TCA_ACT_KIND];
2100
2101 return kind;
2102 }
2103
tc_dump_action(struct sk_buff * skb,struct netlink_callback * cb)2104 static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
2105 {
2106 struct net *net = sock_net(skb->sk);
2107 struct nlmsghdr *nlh;
2108 unsigned char *b = skb_tail_pointer(skb);
2109 struct nlattr *nest;
2110 struct tc_action_ops *a_o;
2111 int ret = 0;
2112 struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh);
2113 struct nlattr *tb[TCA_ROOT_MAX + 1];
2114 struct nlattr *count_attr = NULL;
2115 unsigned long jiffy_since = 0;
2116 struct nlattr *kind = NULL;
2117 struct nla_bitfield32 bf;
2118 u32 msecs_since = 0;
2119 u32 act_count = 0;
2120
2121 ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb,
2122 TCA_ROOT_MAX, tcaa_policy, cb->extack);
2123 if (ret < 0)
2124 return ret;
2125
2126 kind = find_dump_kind(tb);
2127 if (kind == NULL) {
2128 pr_info("tc_dump_action: action bad kind\n");
2129 return 0;
2130 }
2131
2132 a_o = tc_lookup_action(kind);
2133 if (a_o == NULL)
2134 return 0;
2135
2136 cb->args[2] = 0;
2137 if (tb[TCA_ROOT_FLAGS]) {
2138 bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]);
2139 cb->args[2] = bf.value;
2140 }
2141
2142 if (tb[TCA_ROOT_TIME_DELTA]) {
2143 msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]);
2144 }
2145
2146 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2147 cb->nlh->nlmsg_type, sizeof(*t), 0);
2148 if (!nlh)
2149 goto out_module_put;
2150
2151 if (msecs_since)
2152 jiffy_since = jiffies - msecs_to_jiffies(msecs_since);
2153
2154 t = nlmsg_data(nlh);
2155 t->tca_family = AF_UNSPEC;
2156 t->tca__pad1 = 0;
2157 t->tca__pad2 = 0;
2158 cb->args[3] = jiffy_since;
2159 count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32));
2160 if (!count_attr)
2161 goto out_module_put;
2162
2163 nest = nla_nest_start_noflag(skb, TCA_ACT_TAB);
2164 if (nest == NULL)
2165 goto out_module_put;
2166
2167 ret = __tcf_generic_walker(net, skb, cb, RTM_GETACTION, a_o, NULL);
2168 if (ret < 0)
2169 goto out_module_put;
2170
2171 if (ret > 0) {
2172 nla_nest_end(skb, nest);
2173 ret = skb->len;
2174 act_count = cb->args[1];
2175 memcpy(nla_data(count_attr), &act_count, sizeof(u32));
2176 cb->args[1] = 0;
2177 } else
2178 nlmsg_trim(skb, b);
2179
2180 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2181 if (NETLINK_CB(cb->skb).portid && ret)
2182 nlh->nlmsg_flags |= NLM_F_MULTI;
2183 module_put(a_o->owner);
2184 return skb->len;
2185
2186 out_module_put:
2187 module_put(a_o->owner);
2188 nlmsg_trim(skb, b);
2189 return skb->len;
2190 }
2191
tc_action_init(void)2192 static int __init tc_action_init(void)
2193 {
2194 rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0);
2195 rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0);
2196 rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
2197 0);
2198
2199 return 0;
2200 }
2201
2202 subsys_initcall(tc_action_init);
2203