1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2016, Amir Vadai <amir@vadai.me>
4 * Copyright (c) 2016, Mellanox Technologies. All rights reserved.
5 */
6
7 #include <linux/module.h>
8 #include <linux/init.h>
9 #include <linux/kernel.h>
10 #include <linux/skbuff.h>
11 #include <linux/rtnetlink.h>
12 #include <net/geneve.h>
13 #include <net/vxlan.h>
14 #include <net/erspan.h>
15 #include <net/netlink.h>
16 #include <net/pkt_sched.h>
17 #include <net/dst.h>
18 #include <net/pkt_cls.h>
19 #include <net/tc_wrapper.h>
20
21 #include <linux/tc_act/tc_tunnel_key.h>
22 #include <net/tc_act/tc_tunnel_key.h>
23
24 static struct tc_action_ops act_tunnel_key_ops;
25
tunnel_key_act(struct sk_buff * skb,const struct tc_action * a,struct tcf_result * res)26 TC_INDIRECT_SCOPE int tunnel_key_act(struct sk_buff *skb,
27 const struct tc_action *a,
28 struct tcf_result *res)
29 {
30 struct tcf_tunnel_key *t = to_tunnel_key(a);
31 struct tcf_tunnel_key_params *params;
32 int action;
33
34 params = rcu_dereference_bh(t->params);
35
36 tcf_lastuse_update(&t->tcf_tm);
37 tcf_action_update_bstats(&t->common, skb);
38 action = READ_ONCE(t->tcf_action);
39
40 switch (params->tcft_action) {
41 case TCA_TUNNEL_KEY_ACT_RELEASE:
42 skb_dst_drop(skb);
43 break;
44 case TCA_TUNNEL_KEY_ACT_SET:
45 skb_dst_drop(skb);
46 skb_dst_set(skb, dst_clone(¶ms->tcft_enc_metadata->dst));
47 break;
48 default:
49 WARN_ONCE(1, "Bad tunnel_key action %d.\n",
50 params->tcft_action);
51 break;
52 }
53
54 return action;
55 }
56
57 static const struct nla_policy
58 enc_opts_policy[TCA_TUNNEL_KEY_ENC_OPTS_MAX + 1] = {
59 [TCA_TUNNEL_KEY_ENC_OPTS_UNSPEC] = {
60 .strict_start_type = TCA_TUNNEL_KEY_ENC_OPTS_VXLAN },
61 [TCA_TUNNEL_KEY_ENC_OPTS_GENEVE] = { .type = NLA_NESTED },
62 [TCA_TUNNEL_KEY_ENC_OPTS_VXLAN] = { .type = NLA_NESTED },
63 [TCA_TUNNEL_KEY_ENC_OPTS_ERSPAN] = { .type = NLA_NESTED },
64 };
65
66 static const struct nla_policy
67 geneve_opt_policy[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX + 1] = {
68 [TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS] = { .type = NLA_U16 },
69 [TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE] = { .type = NLA_U8 },
70 [TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA] = { .type = NLA_BINARY,
71 .len = 128 },
72 };
73
74 static const struct nla_policy
75 vxlan_opt_policy[TCA_TUNNEL_KEY_ENC_OPT_VXLAN_MAX + 1] = {
76 [TCA_TUNNEL_KEY_ENC_OPT_VXLAN_GBP] = { .type = NLA_U32 },
77 };
78
79 static const struct nla_policy
80 erspan_opt_policy[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_MAX + 1] = {
81 [TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_VER] = { .type = NLA_U8 },
82 [TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_INDEX] = { .type = NLA_U32 },
83 [TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_DIR] = { .type = NLA_U8 },
84 [TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_HWID] = { .type = NLA_U8 },
85 };
86
87 static int
tunnel_key_copy_geneve_opt(const struct nlattr * nla,void * dst,int dst_len,struct netlink_ext_ack * extack)88 tunnel_key_copy_geneve_opt(const struct nlattr *nla, void *dst, int dst_len,
89 struct netlink_ext_ack *extack)
90 {
91 struct nlattr *tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX + 1];
92 int err, data_len, opt_len;
93 u8 *data;
94
95 err = nla_parse_nested_deprecated(tb,
96 TCA_TUNNEL_KEY_ENC_OPT_GENEVE_MAX,
97 nla, geneve_opt_policy, extack);
98 if (err < 0)
99 return err;
100
101 if (!tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS] ||
102 !tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE] ||
103 !tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]) {
104 NL_SET_ERR_MSG(extack, "Missing tunnel key geneve option class, type or data");
105 return -EINVAL;
106 }
107
108 data = nla_data(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]);
109 data_len = nla_len(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA]);
110 if (data_len < 4) {
111 NL_SET_ERR_MSG(extack, "Tunnel key geneve option data is less than 4 bytes long");
112 return -ERANGE;
113 }
114 if (data_len % 4) {
115 NL_SET_ERR_MSG(extack, "Tunnel key geneve option data is not a multiple of 4 bytes long");
116 return -ERANGE;
117 }
118
119 opt_len = sizeof(struct geneve_opt) + data_len;
120 if (dst) {
121 struct geneve_opt *opt = dst;
122
123 WARN_ON(dst_len < opt_len);
124
125 opt->opt_class =
126 nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS]);
127 opt->type = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE]);
128 opt->length = data_len / 4; /* length is in units of 4 bytes */
129 opt->r1 = 0;
130 opt->r2 = 0;
131 opt->r3 = 0;
132
133 memcpy(opt + 1, data, data_len);
134 }
135
136 return opt_len;
137 }
138
139 static int
tunnel_key_copy_vxlan_opt(const struct nlattr * nla,void * dst,int dst_len,struct netlink_ext_ack * extack)140 tunnel_key_copy_vxlan_opt(const struct nlattr *nla, void *dst, int dst_len,
141 struct netlink_ext_ack *extack)
142 {
143 struct nlattr *tb[TCA_TUNNEL_KEY_ENC_OPT_VXLAN_MAX + 1];
144 int err;
145
146 err = nla_parse_nested(tb, TCA_TUNNEL_KEY_ENC_OPT_VXLAN_MAX, nla,
147 vxlan_opt_policy, extack);
148 if (err < 0)
149 return err;
150
151 if (!tb[TCA_TUNNEL_KEY_ENC_OPT_VXLAN_GBP]) {
152 NL_SET_ERR_MSG(extack, "Missing tunnel key vxlan option gbp");
153 return -EINVAL;
154 }
155
156 if (dst) {
157 struct vxlan_metadata *md = dst;
158
159 md->gbp = nla_get_u32(tb[TCA_TUNNEL_KEY_ENC_OPT_VXLAN_GBP]);
160 md->gbp &= VXLAN_GBP_MASK;
161 }
162
163 return sizeof(struct vxlan_metadata);
164 }
165
166 static int
tunnel_key_copy_erspan_opt(const struct nlattr * nla,void * dst,int dst_len,struct netlink_ext_ack * extack)167 tunnel_key_copy_erspan_opt(const struct nlattr *nla, void *dst, int dst_len,
168 struct netlink_ext_ack *extack)
169 {
170 struct nlattr *tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_MAX + 1];
171 int err;
172 u8 ver;
173
174 err = nla_parse_nested(tb, TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_MAX, nla,
175 erspan_opt_policy, extack);
176 if (err < 0)
177 return err;
178
179 if (!tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_VER]) {
180 NL_SET_ERR_MSG(extack, "Missing tunnel key erspan option ver");
181 return -EINVAL;
182 }
183
184 ver = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_VER]);
185 if (ver == 1) {
186 if (!tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_INDEX]) {
187 NL_SET_ERR_MSG(extack, "Missing tunnel key erspan option index");
188 return -EINVAL;
189 }
190 } else if (ver == 2) {
191 if (!tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_DIR] ||
192 !tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_HWID]) {
193 NL_SET_ERR_MSG(extack, "Missing tunnel key erspan option dir or hwid");
194 return -EINVAL;
195 }
196 } else {
197 NL_SET_ERR_MSG(extack, "Tunnel key erspan option ver is incorrect");
198 return -EINVAL;
199 }
200
201 if (dst) {
202 struct erspan_metadata *md = dst;
203
204 md->version = ver;
205 if (ver == 1) {
206 nla = tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_INDEX];
207 md->u.index = nla_get_be32(nla);
208 } else {
209 nla = tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_DIR];
210 md->u.md2.dir = nla_get_u8(nla);
211 nla = tb[TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_HWID];
212 set_hwid(&md->u.md2, nla_get_u8(nla));
213 }
214 }
215
216 return sizeof(struct erspan_metadata);
217 }
218
tunnel_key_copy_opts(const struct nlattr * nla,u8 * dst,int dst_len,struct netlink_ext_ack * extack)219 static int tunnel_key_copy_opts(const struct nlattr *nla, u8 *dst,
220 int dst_len, struct netlink_ext_ack *extack)
221 {
222 int err, rem, opt_len, len = nla_len(nla), opts_len = 0, type = 0;
223 const struct nlattr *attr, *head = nla_data(nla);
224
225 err = nla_validate_deprecated(head, len, TCA_TUNNEL_KEY_ENC_OPTS_MAX,
226 enc_opts_policy, extack);
227 if (err)
228 return err;
229
230 nla_for_each_attr(attr, head, len, rem) {
231 switch (nla_type(attr)) {
232 case TCA_TUNNEL_KEY_ENC_OPTS_GENEVE:
233 if (type && type != TUNNEL_GENEVE_OPT) {
234 NL_SET_ERR_MSG(extack, "Duplicate type for geneve options");
235 return -EINVAL;
236 }
237 opt_len = tunnel_key_copy_geneve_opt(attr, dst,
238 dst_len, extack);
239 if (opt_len < 0)
240 return opt_len;
241 opts_len += opt_len;
242 if (opts_len > IP_TUNNEL_OPTS_MAX) {
243 NL_SET_ERR_MSG(extack, "Tunnel options exceeds max size");
244 return -EINVAL;
245 }
246 if (dst) {
247 dst_len -= opt_len;
248 dst += opt_len;
249 }
250 type = TUNNEL_GENEVE_OPT;
251 break;
252 case TCA_TUNNEL_KEY_ENC_OPTS_VXLAN:
253 if (type) {
254 NL_SET_ERR_MSG(extack, "Duplicate type for vxlan options");
255 return -EINVAL;
256 }
257 opt_len = tunnel_key_copy_vxlan_opt(attr, dst,
258 dst_len, extack);
259 if (opt_len < 0)
260 return opt_len;
261 opts_len += opt_len;
262 type = TUNNEL_VXLAN_OPT;
263 break;
264 case TCA_TUNNEL_KEY_ENC_OPTS_ERSPAN:
265 if (type) {
266 NL_SET_ERR_MSG(extack, "Duplicate type for erspan options");
267 return -EINVAL;
268 }
269 opt_len = tunnel_key_copy_erspan_opt(attr, dst,
270 dst_len, extack);
271 if (opt_len < 0)
272 return opt_len;
273 opts_len += opt_len;
274 type = TUNNEL_ERSPAN_OPT;
275 break;
276 }
277 }
278
279 if (!opts_len) {
280 NL_SET_ERR_MSG(extack, "Empty list of tunnel options");
281 return -EINVAL;
282 }
283
284 if (rem > 0) {
285 NL_SET_ERR_MSG(extack, "Trailing data after parsing tunnel key options attributes");
286 return -EINVAL;
287 }
288
289 return opts_len;
290 }
291
tunnel_key_get_opts_len(struct nlattr * nla,struct netlink_ext_ack * extack)292 static int tunnel_key_get_opts_len(struct nlattr *nla,
293 struct netlink_ext_ack *extack)
294 {
295 return tunnel_key_copy_opts(nla, NULL, 0, extack);
296 }
297
tunnel_key_opts_set(struct nlattr * nla,struct ip_tunnel_info * info,int opts_len,struct netlink_ext_ack * extack)298 static int tunnel_key_opts_set(struct nlattr *nla, struct ip_tunnel_info *info,
299 int opts_len, struct netlink_ext_ack *extack)
300 {
301 info->options_len = opts_len;
302 switch (nla_type(nla_data(nla))) {
303 case TCA_TUNNEL_KEY_ENC_OPTS_GENEVE:
304 #if IS_ENABLED(CONFIG_INET)
305 info->key.tun_flags |= TUNNEL_GENEVE_OPT;
306 return tunnel_key_copy_opts(nla, ip_tunnel_info_opts(info),
307 opts_len, extack);
308 #else
309 return -EAFNOSUPPORT;
310 #endif
311 case TCA_TUNNEL_KEY_ENC_OPTS_VXLAN:
312 #if IS_ENABLED(CONFIG_INET)
313 info->key.tun_flags |= TUNNEL_VXLAN_OPT;
314 return tunnel_key_copy_opts(nla, ip_tunnel_info_opts(info),
315 opts_len, extack);
316 #else
317 return -EAFNOSUPPORT;
318 #endif
319 case TCA_TUNNEL_KEY_ENC_OPTS_ERSPAN:
320 #if IS_ENABLED(CONFIG_INET)
321 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
322 return tunnel_key_copy_opts(nla, ip_tunnel_info_opts(info),
323 opts_len, extack);
324 #else
325 return -EAFNOSUPPORT;
326 #endif
327 default:
328 NL_SET_ERR_MSG(extack, "Cannot set tunnel options for unknown tunnel type");
329 return -EINVAL;
330 }
331 }
332
333 static const struct nla_policy tunnel_key_policy[TCA_TUNNEL_KEY_MAX + 1] = {
334 [TCA_TUNNEL_KEY_PARMS] = { .len = sizeof(struct tc_tunnel_key) },
335 [TCA_TUNNEL_KEY_ENC_IPV4_SRC] = { .type = NLA_U32 },
336 [TCA_TUNNEL_KEY_ENC_IPV4_DST] = { .type = NLA_U32 },
337 [TCA_TUNNEL_KEY_ENC_IPV6_SRC] = { .len = sizeof(struct in6_addr) },
338 [TCA_TUNNEL_KEY_ENC_IPV6_DST] = { .len = sizeof(struct in6_addr) },
339 [TCA_TUNNEL_KEY_ENC_KEY_ID] = { .type = NLA_U32 },
340 [TCA_TUNNEL_KEY_ENC_DST_PORT] = {.type = NLA_U16},
341 [TCA_TUNNEL_KEY_NO_CSUM] = { .type = NLA_U8 },
342 [TCA_TUNNEL_KEY_ENC_OPTS] = { .type = NLA_NESTED },
343 [TCA_TUNNEL_KEY_ENC_TOS] = { .type = NLA_U8 },
344 [TCA_TUNNEL_KEY_ENC_TTL] = { .type = NLA_U8 },
345 };
346
tunnel_key_release_params(struct tcf_tunnel_key_params * p)347 static void tunnel_key_release_params(struct tcf_tunnel_key_params *p)
348 {
349 if (!p)
350 return;
351 if (p->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
352 dst_release(&p->tcft_enc_metadata->dst);
353
354 kfree_rcu(p, rcu);
355 }
356
tunnel_key_init(struct net * net,struct nlattr * nla,struct nlattr * est,struct tc_action ** a,struct tcf_proto * tp,u32 act_flags,struct netlink_ext_ack * extack)357 static int tunnel_key_init(struct net *net, struct nlattr *nla,
358 struct nlattr *est, struct tc_action **a,
359 struct tcf_proto *tp, u32 act_flags,
360 struct netlink_ext_ack *extack)
361 {
362 struct tc_action_net *tn = net_generic(net, act_tunnel_key_ops.net_id);
363 bool bind = act_flags & TCA_ACT_FLAGS_BIND;
364 struct nlattr *tb[TCA_TUNNEL_KEY_MAX + 1];
365 struct tcf_tunnel_key_params *params_new;
366 struct metadata_dst *metadata = NULL;
367 struct tcf_chain *goto_ch = NULL;
368 struct tc_tunnel_key *parm;
369 struct tcf_tunnel_key *t;
370 bool exists = false;
371 __be16 dst_port = 0;
372 __be64 key_id = 0;
373 int opts_len = 0;
374 __be16 flags = 0;
375 u8 tos, ttl;
376 int ret = 0;
377 u32 index;
378 int err;
379
380 if (!nla) {
381 NL_SET_ERR_MSG(extack, "Tunnel requires attributes to be passed");
382 return -EINVAL;
383 }
384
385 err = nla_parse_nested_deprecated(tb, TCA_TUNNEL_KEY_MAX, nla,
386 tunnel_key_policy, extack);
387 if (err < 0) {
388 NL_SET_ERR_MSG(extack, "Failed to parse nested tunnel key attributes");
389 return err;
390 }
391
392 if (!tb[TCA_TUNNEL_KEY_PARMS]) {
393 NL_SET_ERR_MSG(extack, "Missing tunnel key parameters");
394 return -EINVAL;
395 }
396
397 parm = nla_data(tb[TCA_TUNNEL_KEY_PARMS]);
398 index = parm->index;
399 err = tcf_idr_check_alloc(tn, &index, a, bind);
400 if (err < 0)
401 return err;
402 exists = err;
403 if (exists && bind)
404 return 0;
405
406 switch (parm->t_action) {
407 case TCA_TUNNEL_KEY_ACT_RELEASE:
408 break;
409 case TCA_TUNNEL_KEY_ACT_SET:
410 if (tb[TCA_TUNNEL_KEY_ENC_KEY_ID]) {
411 __be32 key32;
412
413 key32 = nla_get_be32(tb[TCA_TUNNEL_KEY_ENC_KEY_ID]);
414 key_id = key32_to_tunnel_id(key32);
415 flags = TUNNEL_KEY;
416 }
417
418 flags |= TUNNEL_CSUM;
419 if (tb[TCA_TUNNEL_KEY_NO_CSUM] &&
420 nla_get_u8(tb[TCA_TUNNEL_KEY_NO_CSUM]))
421 flags &= ~TUNNEL_CSUM;
422
423 if (nla_get_flag(tb[TCA_TUNNEL_KEY_NO_FRAG]))
424 flags |= TUNNEL_DONT_FRAGMENT;
425
426 if (tb[TCA_TUNNEL_KEY_ENC_DST_PORT])
427 dst_port = nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_DST_PORT]);
428
429 if (tb[TCA_TUNNEL_KEY_ENC_OPTS]) {
430 opts_len = tunnel_key_get_opts_len(tb[TCA_TUNNEL_KEY_ENC_OPTS],
431 extack);
432 if (opts_len < 0) {
433 ret = opts_len;
434 goto err_out;
435 }
436 }
437
438 tos = 0;
439 if (tb[TCA_TUNNEL_KEY_ENC_TOS])
440 tos = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_TOS]);
441 ttl = 0;
442 if (tb[TCA_TUNNEL_KEY_ENC_TTL])
443 ttl = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_TTL]);
444
445 if (tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC] &&
446 tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]) {
447 __be32 saddr;
448 __be32 daddr;
449
450 saddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC]);
451 daddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]);
452
453 metadata = __ip_tun_set_dst(saddr, daddr, tos, ttl,
454 dst_port, flags,
455 key_id, opts_len);
456 } else if (tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC] &&
457 tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]) {
458 struct in6_addr saddr;
459 struct in6_addr daddr;
460
461 saddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC]);
462 daddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]);
463
464 metadata = __ipv6_tun_set_dst(&saddr, &daddr, tos, ttl, dst_port,
465 0, flags,
466 key_id, opts_len);
467 } else {
468 NL_SET_ERR_MSG(extack, "Missing either ipv4 or ipv6 src and dst");
469 ret = -EINVAL;
470 goto err_out;
471 }
472
473 if (!metadata) {
474 NL_SET_ERR_MSG(extack, "Cannot allocate tunnel metadata dst");
475 ret = -ENOMEM;
476 goto err_out;
477 }
478
479 #ifdef CONFIG_DST_CACHE
480 ret = dst_cache_init(&metadata->u.tun_info.dst_cache, GFP_KERNEL);
481 if (ret)
482 goto release_tun_meta;
483 #endif
484
485 if (opts_len) {
486 ret = tunnel_key_opts_set(tb[TCA_TUNNEL_KEY_ENC_OPTS],
487 &metadata->u.tun_info,
488 opts_len, extack);
489 if (ret < 0)
490 goto release_tun_meta;
491 }
492
493 metadata->u.tun_info.mode |= IP_TUNNEL_INFO_TX;
494 break;
495 default:
496 NL_SET_ERR_MSG(extack, "Unknown tunnel key action");
497 ret = -EINVAL;
498 goto err_out;
499 }
500
501 if (!exists) {
502 ret = tcf_idr_create_from_flags(tn, index, est, a,
503 &act_tunnel_key_ops, bind,
504 act_flags);
505 if (ret) {
506 NL_SET_ERR_MSG(extack, "Cannot create TC IDR");
507 goto release_tun_meta;
508 }
509
510 ret = ACT_P_CREATED;
511 } else if (!(act_flags & TCA_ACT_FLAGS_REPLACE)) {
512 NL_SET_ERR_MSG(extack, "TC IDR already exists");
513 ret = -EEXIST;
514 goto release_tun_meta;
515 }
516
517 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
518 if (err < 0) {
519 ret = err;
520 exists = true;
521 goto release_tun_meta;
522 }
523 t = to_tunnel_key(*a);
524
525 params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
526 if (unlikely(!params_new)) {
527 NL_SET_ERR_MSG(extack, "Cannot allocate tunnel key parameters");
528 ret = -ENOMEM;
529 exists = true;
530 goto put_chain;
531 }
532 params_new->tcft_action = parm->t_action;
533 params_new->tcft_enc_metadata = metadata;
534
535 spin_lock_bh(&t->tcf_lock);
536 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
537 params_new = rcu_replace_pointer(t->params, params_new,
538 lockdep_is_held(&t->tcf_lock));
539 spin_unlock_bh(&t->tcf_lock);
540 tunnel_key_release_params(params_new);
541 if (goto_ch)
542 tcf_chain_put_by_act(goto_ch);
543
544 return ret;
545
546 put_chain:
547 if (goto_ch)
548 tcf_chain_put_by_act(goto_ch);
549
550 release_tun_meta:
551 if (metadata)
552 dst_release(&metadata->dst);
553
554 err_out:
555 if (exists)
556 tcf_idr_release(*a, bind);
557 else
558 tcf_idr_cleanup(tn, index);
559 return ret;
560 }
561
tunnel_key_release(struct tc_action * a)562 static void tunnel_key_release(struct tc_action *a)
563 {
564 struct tcf_tunnel_key *t = to_tunnel_key(a);
565 struct tcf_tunnel_key_params *params;
566
567 params = rcu_dereference_protected(t->params, 1);
568 tunnel_key_release_params(params);
569 }
570
tunnel_key_geneve_opts_dump(struct sk_buff * skb,const struct ip_tunnel_info * info)571 static int tunnel_key_geneve_opts_dump(struct sk_buff *skb,
572 const struct ip_tunnel_info *info)
573 {
574 int len = info->options_len;
575 u8 *src = (u8 *)(info + 1);
576 struct nlattr *start;
577
578 start = nla_nest_start_noflag(skb, TCA_TUNNEL_KEY_ENC_OPTS_GENEVE);
579 if (!start)
580 return -EMSGSIZE;
581
582 while (len > 0) {
583 struct geneve_opt *opt = (struct geneve_opt *)src;
584
585 if (nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_CLASS,
586 opt->opt_class) ||
587 nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_TYPE,
588 opt->type) ||
589 nla_put(skb, TCA_TUNNEL_KEY_ENC_OPT_GENEVE_DATA,
590 opt->length * 4, opt + 1)) {
591 nla_nest_cancel(skb, start);
592 return -EMSGSIZE;
593 }
594
595 len -= sizeof(struct geneve_opt) + opt->length * 4;
596 src += sizeof(struct geneve_opt) + opt->length * 4;
597 }
598
599 nla_nest_end(skb, start);
600 return 0;
601 }
602
tunnel_key_vxlan_opts_dump(struct sk_buff * skb,const struct ip_tunnel_info * info)603 static int tunnel_key_vxlan_opts_dump(struct sk_buff *skb,
604 const struct ip_tunnel_info *info)
605 {
606 struct vxlan_metadata *md = (struct vxlan_metadata *)(info + 1);
607 struct nlattr *start;
608
609 start = nla_nest_start_noflag(skb, TCA_TUNNEL_KEY_ENC_OPTS_VXLAN);
610 if (!start)
611 return -EMSGSIZE;
612
613 if (nla_put_u32(skb, TCA_TUNNEL_KEY_ENC_OPT_VXLAN_GBP, md->gbp)) {
614 nla_nest_cancel(skb, start);
615 return -EMSGSIZE;
616 }
617
618 nla_nest_end(skb, start);
619 return 0;
620 }
621
tunnel_key_erspan_opts_dump(struct sk_buff * skb,const struct ip_tunnel_info * info)622 static int tunnel_key_erspan_opts_dump(struct sk_buff *skb,
623 const struct ip_tunnel_info *info)
624 {
625 struct erspan_metadata *md = (struct erspan_metadata *)(info + 1);
626 struct nlattr *start;
627
628 start = nla_nest_start_noflag(skb, TCA_TUNNEL_KEY_ENC_OPTS_ERSPAN);
629 if (!start)
630 return -EMSGSIZE;
631
632 if (nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_VER, md->version))
633 goto err;
634
635 if (md->version == 1 &&
636 nla_put_be32(skb, TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_INDEX, md->u.index))
637 goto err;
638
639 if (md->version == 2 &&
640 (nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_DIR,
641 md->u.md2.dir) ||
642 nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_OPT_ERSPAN_HWID,
643 get_hwid(&md->u.md2))))
644 goto err;
645
646 nla_nest_end(skb, start);
647 return 0;
648 err:
649 nla_nest_cancel(skb, start);
650 return -EMSGSIZE;
651 }
652
tunnel_key_opts_dump(struct sk_buff * skb,const struct ip_tunnel_info * info)653 static int tunnel_key_opts_dump(struct sk_buff *skb,
654 const struct ip_tunnel_info *info)
655 {
656 struct nlattr *start;
657 int err = -EINVAL;
658
659 if (!info->options_len)
660 return 0;
661
662 start = nla_nest_start_noflag(skb, TCA_TUNNEL_KEY_ENC_OPTS);
663 if (!start)
664 return -EMSGSIZE;
665
666 if (info->key.tun_flags & TUNNEL_GENEVE_OPT) {
667 err = tunnel_key_geneve_opts_dump(skb, info);
668 if (err)
669 goto err_out;
670 } else if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
671 err = tunnel_key_vxlan_opts_dump(skb, info);
672 if (err)
673 goto err_out;
674 } else if (info->key.tun_flags & TUNNEL_ERSPAN_OPT) {
675 err = tunnel_key_erspan_opts_dump(skb, info);
676 if (err)
677 goto err_out;
678 } else {
679 err_out:
680 nla_nest_cancel(skb, start);
681 return err;
682 }
683
684 nla_nest_end(skb, start);
685 return 0;
686 }
687
tunnel_key_dump_addresses(struct sk_buff * skb,const struct ip_tunnel_info * info)688 static int tunnel_key_dump_addresses(struct sk_buff *skb,
689 const struct ip_tunnel_info *info)
690 {
691 unsigned short family = ip_tunnel_info_af(info);
692
693 if (family == AF_INET) {
694 __be32 saddr = info->key.u.ipv4.src;
695 __be32 daddr = info->key.u.ipv4.dst;
696
697 if (!nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_SRC, saddr) &&
698 !nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_DST, daddr))
699 return 0;
700 }
701
702 if (family == AF_INET6) {
703 const struct in6_addr *saddr6 = &info->key.u.ipv6.src;
704 const struct in6_addr *daddr6 = &info->key.u.ipv6.dst;
705
706 if (!nla_put_in6_addr(skb,
707 TCA_TUNNEL_KEY_ENC_IPV6_SRC, saddr6) &&
708 !nla_put_in6_addr(skb,
709 TCA_TUNNEL_KEY_ENC_IPV6_DST, daddr6))
710 return 0;
711 }
712
713 return -EINVAL;
714 }
715
tunnel_key_dump(struct sk_buff * skb,struct tc_action * a,int bind,int ref)716 static int tunnel_key_dump(struct sk_buff *skb, struct tc_action *a,
717 int bind, int ref)
718 {
719 unsigned char *b = skb_tail_pointer(skb);
720 struct tcf_tunnel_key *t = to_tunnel_key(a);
721 struct tcf_tunnel_key_params *params;
722 struct tc_tunnel_key opt = {
723 .index = t->tcf_index,
724 .refcnt = refcount_read(&t->tcf_refcnt) - ref,
725 .bindcnt = atomic_read(&t->tcf_bindcnt) - bind,
726 };
727 struct tcf_t tm;
728
729 spin_lock_bh(&t->tcf_lock);
730 params = rcu_dereference_protected(t->params,
731 lockdep_is_held(&t->tcf_lock));
732 opt.action = t->tcf_action;
733 opt.t_action = params->tcft_action;
734
735 if (nla_put(skb, TCA_TUNNEL_KEY_PARMS, sizeof(opt), &opt))
736 goto nla_put_failure;
737
738 if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET) {
739 struct ip_tunnel_info *info =
740 ¶ms->tcft_enc_metadata->u.tun_info;
741 struct ip_tunnel_key *key = &info->key;
742 __be32 key_id = tunnel_id_to_key32(key->tun_id);
743
744 if (((key->tun_flags & TUNNEL_KEY) &&
745 nla_put_be32(skb, TCA_TUNNEL_KEY_ENC_KEY_ID, key_id)) ||
746 tunnel_key_dump_addresses(skb,
747 ¶ms->tcft_enc_metadata->u.tun_info) ||
748 (key->tp_dst &&
749 nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_DST_PORT,
750 key->tp_dst)) ||
751 nla_put_u8(skb, TCA_TUNNEL_KEY_NO_CSUM,
752 !(key->tun_flags & TUNNEL_CSUM)) ||
753 ((key->tun_flags & TUNNEL_DONT_FRAGMENT) &&
754 nla_put_flag(skb, TCA_TUNNEL_KEY_NO_FRAG)) ||
755 tunnel_key_opts_dump(skb, info))
756 goto nla_put_failure;
757
758 if (key->tos && nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_TOS, key->tos))
759 goto nla_put_failure;
760
761 if (key->ttl && nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_TTL, key->ttl))
762 goto nla_put_failure;
763 }
764
765 tcf_tm_dump(&tm, &t->tcf_tm);
766 if (nla_put_64bit(skb, TCA_TUNNEL_KEY_TM, sizeof(tm),
767 &tm, TCA_TUNNEL_KEY_PAD))
768 goto nla_put_failure;
769 spin_unlock_bh(&t->tcf_lock);
770
771 return skb->len;
772
773 nla_put_failure:
774 spin_unlock_bh(&t->tcf_lock);
775 nlmsg_trim(skb, b);
776 return -1;
777 }
778
tcf_tunnel_encap_put_tunnel(void * priv)779 static void tcf_tunnel_encap_put_tunnel(void *priv)
780 {
781 struct ip_tunnel_info *tunnel = priv;
782
783 kfree(tunnel);
784 }
785
tcf_tunnel_encap_get_tunnel(struct flow_action_entry * entry,const struct tc_action * act)786 static int tcf_tunnel_encap_get_tunnel(struct flow_action_entry *entry,
787 const struct tc_action *act)
788 {
789 entry->tunnel = tcf_tunnel_info_copy(act);
790 if (!entry->tunnel)
791 return -ENOMEM;
792 entry->destructor = tcf_tunnel_encap_put_tunnel;
793 entry->destructor_priv = entry->tunnel;
794 return 0;
795 }
796
tcf_tunnel_key_offload_act_setup(struct tc_action * act,void * entry_data,u32 * index_inc,bool bind,struct netlink_ext_ack * extack)797 static int tcf_tunnel_key_offload_act_setup(struct tc_action *act,
798 void *entry_data,
799 u32 *index_inc,
800 bool bind,
801 struct netlink_ext_ack *extack)
802 {
803 int err;
804
805 if (bind) {
806 struct flow_action_entry *entry = entry_data;
807
808 if (is_tcf_tunnel_set(act)) {
809 entry->id = FLOW_ACTION_TUNNEL_ENCAP;
810 err = tcf_tunnel_encap_get_tunnel(entry, act);
811 if (err)
812 return err;
813 } else if (is_tcf_tunnel_release(act)) {
814 entry->id = FLOW_ACTION_TUNNEL_DECAP;
815 } else {
816 NL_SET_ERR_MSG_MOD(extack, "Unsupported tunnel key mode offload");
817 return -EOPNOTSUPP;
818 }
819 *index_inc = 1;
820 } else {
821 struct flow_offload_action *fl_action = entry_data;
822
823 if (is_tcf_tunnel_set(act))
824 fl_action->id = FLOW_ACTION_TUNNEL_ENCAP;
825 else if (is_tcf_tunnel_release(act))
826 fl_action->id = FLOW_ACTION_TUNNEL_DECAP;
827 else
828 return -EOPNOTSUPP;
829 }
830
831 return 0;
832 }
833
834 static struct tc_action_ops act_tunnel_key_ops = {
835 .kind = "tunnel_key",
836 .id = TCA_ID_TUNNEL_KEY,
837 .owner = THIS_MODULE,
838 .act = tunnel_key_act,
839 .dump = tunnel_key_dump,
840 .init = tunnel_key_init,
841 .cleanup = tunnel_key_release,
842 .offload_act_setup = tcf_tunnel_key_offload_act_setup,
843 .size = sizeof(struct tcf_tunnel_key),
844 };
845
tunnel_key_init_net(struct net * net)846 static __net_init int tunnel_key_init_net(struct net *net)
847 {
848 struct tc_action_net *tn = net_generic(net, act_tunnel_key_ops.net_id);
849
850 return tc_action_net_init(net, tn, &act_tunnel_key_ops);
851 }
852
tunnel_key_exit_net(struct list_head * net_list)853 static void __net_exit tunnel_key_exit_net(struct list_head *net_list)
854 {
855 tc_action_net_exit(net_list, act_tunnel_key_ops.net_id);
856 }
857
858 static struct pernet_operations tunnel_key_net_ops = {
859 .init = tunnel_key_init_net,
860 .exit_batch = tunnel_key_exit_net,
861 .id = &act_tunnel_key_ops.net_id,
862 .size = sizeof(struct tc_action_net),
863 };
864
tunnel_key_init_module(void)865 static int __init tunnel_key_init_module(void)
866 {
867 return tcf_register_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
868 }
869
tunnel_key_cleanup_module(void)870 static void __exit tunnel_key_cleanup_module(void)
871 {
872 tcf_unregister_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
873 }
874
875 module_init(tunnel_key_init_module);
876 module_exit(tunnel_key_cleanup_module);
877
878 MODULE_AUTHOR("Amir Vadai <amir@vadai.me>");
879 MODULE_DESCRIPTION("ip tunnel manipulation actions");
880 MODULE_LICENSE("GPL v2");
881