Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * net/sched/act_api.c Packet action API. | |
4 | * | |
1da177e4 | 5 | * Author: Jamal Hadi Salim |
1da177e4 LT |
6 | */ |
7 | ||
1da177e4 LT |
8 | #include <linux/types.h> |
9 | #include <linux/kernel.h> | |
1da177e4 | 10 | #include <linux/string.h> |
1da177e4 | 11 | #include <linux/errno.h> |
5a0e3ad6 | 12 | #include <linux/slab.h> |
1da177e4 | 13 | #include <linux/skbuff.h> |
1da177e4 LT |
14 | #include <linux/init.h> |
15 | #include <linux/kmod.h> | |
ab27cfb8 | 16 | #include <linux/err.h> |
3a9a231d | 17 | #include <linux/module.h> |
b854272b DL |
18 | #include <net/net_namespace.h> |
19 | #include <net/sock.h> | |
1da177e4 | 20 | #include <net/sch_generic.h> |
1045ba77 | 21 | #include <net/pkt_cls.h> |
1da177e4 | 22 | #include <net/act_api.h> |
dc5fc579 | 23 | #include <net/netlink.h> |
1da177e4 | 24 | |
c129412f | 25 | #ifdef CONFIG_INET |
26 | DEFINE_STATIC_KEY_FALSE(tcf_frag_xmit_count); | |
27 | EXPORT_SYMBOL_GPL(tcf_frag_xmit_count); | |
28 | #endif | |
29 | ||
30 | int tcf_dev_queue_xmit(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb)) | |
31 | { | |
32 | #ifdef CONFIG_INET | |
33 | if (static_branch_unlikely(&tcf_frag_xmit_count)) | |
34 | return sch_frag_xmit_hook(skb, xmit); | |
35 | #endif | |
36 | ||
37 | return xmit(skb); | |
38 | } | |
39 | EXPORT_SYMBOL_GPL(tcf_dev_queue_xmit); | |
40 | ||
db50514f JP |
41 | static void tcf_action_goto_chain_exec(const struct tc_action *a, |
42 | struct tcf_result *res) | |
43 | { | |
ee3bbfe8 | 44 | const struct tcf_chain *chain = rcu_dereference_bh(a->goto_chain); |
db50514f JP |
45 | |
46 | res->goto_tp = rcu_dereference_bh(chain->filter_chain); | |
47 | } | |
48 | ||
eec94fdb VB |
49 | static void tcf_free_cookie_rcu(struct rcu_head *p) |
50 | { | |
51 | struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu); | |
52 | ||
53 | kfree(cookie->data); | |
54 | kfree(cookie); | |
55 | } | |
56 | ||
57 | static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie, | |
58 | struct tc_cookie *new_cookie) | |
59 | { | |
60 | struct tc_cookie *old; | |
61 | ||
0dbc81ea | 62 | old = xchg((__force struct tc_cookie **)old_cookie, new_cookie); |
eec94fdb VB |
63 | if (old) |
64 | call_rcu(&old->rcu, tcf_free_cookie_rcu); | |
65 | } | |
66 | ||
85d0966f DC |
67 | int tcf_action_check_ctrlact(int action, struct tcf_proto *tp, |
68 | struct tcf_chain **newchain, | |
69 | struct netlink_ext_ack *extack) | |
70 | { | |
71 | int opcode = TC_ACT_EXT_OPCODE(action), ret = -EINVAL; | |
72 | u32 chain_index; | |
73 | ||
74 | if (!opcode) | |
75 | ret = action > TC_ACT_VALUE_MAX ? -EINVAL : 0; | |
76 | else if (opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC) | |
77 | ret = 0; | |
78 | if (ret) { | |
79 | NL_SET_ERR_MSG(extack, "invalid control action"); | |
80 | goto end; | |
81 | } | |
82 | ||
83 | if (TC_ACT_EXT_CMP(action, TC_ACT_GOTO_CHAIN)) { | |
84 | chain_index = action & TC_ACT_EXT_VAL_MASK; | |
85 | if (!tp || !newchain) { | |
86 | ret = -EINVAL; | |
87 | NL_SET_ERR_MSG(extack, | |
88 | "can't goto NULL proto/chain"); | |
89 | goto end; | |
90 | } | |
91 | *newchain = tcf_chain_get_by_act(tp->chain->block, chain_index); | |
92 | if (!*newchain) { | |
93 | ret = -ENOMEM; | |
94 | NL_SET_ERR_MSG(extack, | |
95 | "can't allocate goto_chain"); | |
96 | } | |
97 | } | |
98 | end: | |
99 | return ret; | |
100 | } | |
101 | EXPORT_SYMBOL(tcf_action_check_ctrlact); | |
102 | ||
103 | struct tcf_chain *tcf_action_set_ctrlact(struct tc_action *a, int action, | |
ee3bbfe8 | 104 | struct tcf_chain *goto_chain) |
85d0966f | 105 | { |
85d0966f | 106 | a->tcfa_action = action; |
445d3749 | 107 | goto_chain = rcu_replace_pointer(a->goto_chain, goto_chain, 1); |
ee3bbfe8 | 108 | return goto_chain; |
85d0966f DC |
109 | } |
110 | EXPORT_SYMBOL(tcf_action_set_ctrlact); | |
111 | ||
d7fb60b9 CW |
112 | /* XXX: For standalone actions, we don't need a RCU grace period either, because |
113 | * actions are always connected to filters and filters are already destroyed in | |
114 | * RCU callbacks, so after a RCU grace period actions are already disconnected | |
115 | * from filters. Readers later can not find us. | |
116 | */ | |
117 | static void free_tcf(struct tc_action *p) | |
519c818e | 118 | { |
ee3bbfe8 | 119 | struct tcf_chain *chain = rcu_dereference_protected(p->goto_chain, 1); |
85d0966f | 120 | |
519c818e | 121 | free_percpu(p->cpu_bstats); |
28169aba | 122 | free_percpu(p->cpu_bstats_hw); |
519c818e | 123 | free_percpu(p->cpu_qstats); |
1045ba77 | 124 | |
eec94fdb | 125 | tcf_set_action_cookie(&p->act_cookie, NULL); |
85d0966f DC |
126 | if (chain) |
127 | tcf_chain_put_by_act(chain); | |
1045ba77 | 128 | |
519c818e ED |
129 | kfree(p); |
130 | } | |
131 | ||
16af6067 | 132 | static void tcf_action_cleanup(struct tc_action *p) |
e9ce1cd3 | 133 | { |
16af6067 VB |
134 | if (p->ops->cleanup) |
135 | p->ops->cleanup(p); | |
136 | ||
1c0d32fd | 137 | gen_kill_estimator(&p->tcfa_rate_est); |
d7fb60b9 | 138 | free_tcf(p); |
e9ce1cd3 | 139 | } |
e9ce1cd3 | 140 | |
16af6067 VB |
141 | static int __tcf_action_put(struct tc_action *p, bool bind) |
142 | { | |
143 | struct tcf_idrinfo *idrinfo = p->idrinfo; | |
144 | ||
95278dda | 145 | if (refcount_dec_and_mutex_lock(&p->tcfa_refcnt, &idrinfo->lock)) { |
16af6067 VB |
146 | if (bind) |
147 | atomic_dec(&p->tcfa_bindcnt); | |
148 | idr_remove(&idrinfo->action_idr, p->tcfa_index); | |
95278dda | 149 | mutex_unlock(&idrinfo->lock); |
16af6067 VB |
150 | |
151 | tcf_action_cleanup(p); | |
152 | return 1; | |
153 | } | |
154 | ||
155 | if (bind) | |
156 | atomic_dec(&p->tcfa_bindcnt); | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
65a206c0 | 161 | int __tcf_idr_release(struct tc_action *p, bool bind, bool strict) |
e9ce1cd3 DM |
162 | { |
163 | int ret = 0; | |
164 | ||
036bb443 VB |
165 | /* Release with strict==1 and bind==0 is only called through act API |
166 | * interface (classifiers always bind). Only case when action with | |
167 | * positive reference count and zero bind count can exist is when it was | |
168 | * also created with act API (unbinding last classifier will destroy the | |
169 | * action if it was created by classifier). So only case when bind count | |
170 | * can be changed after initial check is when unbound action is | |
171 | * destroyed by act API while classifier binds to action with same id | |
172 | * concurrently. This result either creation of new action(same behavior | |
173 | * as before), or reusing existing action if concurrent process | |
174 | * increments reference count before action is deleted. Both scenarios | |
175 | * are acceptable. | |
176 | */ | |
e9ce1cd3 | 177 | if (p) { |
16af6067 | 178 | if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0) |
55334a5d | 179 | return -EPERM; |
e9ce1cd3 | 180 | |
16af6067 | 181 | if (__tcf_action_put(p, bind)) |
1d4150c0 | 182 | ret = ACT_P_DELETED; |
e9ce1cd3 | 183 | } |
28e6b67f | 184 | |
e9ce1cd3 DM |
185 | return ret; |
186 | } | |
65a206c0 | 187 | EXPORT_SYMBOL(__tcf_idr_release); |
e9ce1cd3 | 188 | |
4e76e75d RM |
189 | static size_t tcf_action_shared_attrs_size(const struct tc_action *act) |
190 | { | |
e0479b67 | 191 | struct tc_cookie *act_cookie; |
4e76e75d RM |
192 | u32 cookie_len = 0; |
193 | ||
e0479b67 VB |
194 | rcu_read_lock(); |
195 | act_cookie = rcu_dereference(act->act_cookie); | |
196 | ||
197 | if (act_cookie) | |
198 | cookie_len = nla_total_size(act_cookie->len); | |
199 | rcu_read_unlock(); | |
4e76e75d RM |
200 | |
201 | return nla_total_size(0) /* action number nested */ | |
202 | + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */ | |
203 | + cookie_len /* TCA_ACT_COOKIE */ | |
0dfb2d82 | 204 | + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */ |
4e76e75d | 205 | + nla_total_size(0) /* TCA_ACT_STATS nested */ |
1521a67e | 206 | + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */ |
4e76e75d RM |
207 | /* TCA_STATS_BASIC */ |
208 | + nla_total_size_64bit(sizeof(struct gnet_stats_basic)) | |
b33e699f ED |
209 | /* TCA_STATS_PKT64 */ |
210 | + nla_total_size_64bit(sizeof(u64)) | |
4e76e75d RM |
211 | /* TCA_STATS_QUEUE */ |
212 | + nla_total_size_64bit(sizeof(struct gnet_stats_queue)) | |
213 | + nla_total_size(0) /* TCA_OPTIONS nested */ | |
214 | + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */ | |
215 | } | |
216 | ||
217 | static size_t tcf_action_full_attrs_size(size_t sz) | |
218 | { | |
219 | return NLMSG_HDRLEN /* struct nlmsghdr */ | |
220 | + sizeof(struct tcamsg) | |
221 | + nla_total_size(0) /* TCA_ACT_TAB nested */ | |
222 | + sz; | |
223 | } | |
224 | ||
225 | static size_t tcf_action_fill_size(const struct tc_action *act) | |
226 | { | |
227 | size_t sz = tcf_action_shared_attrs_size(act); | |
228 | ||
229 | if (act->ops->get_fill_size) | |
230 | return act->ops->get_fill_size(act) + sz; | |
231 | return sz; | |
232 | } | |
233 | ||
94f44f28 VB |
234 | static int |
235 | tcf_action_dump_terse(struct sk_buff *skb, struct tc_action *a, bool from_act) | |
236 | { | |
237 | unsigned char *b = skb_tail_pointer(skb); | |
238 | struct tc_cookie *cookie; | |
239 | ||
240 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) | |
241 | goto nla_put_failure; | |
242 | if (tcf_action_copy_stats(skb, a, 0)) | |
243 | goto nla_put_failure; | |
244 | if (from_act && nla_put_u32(skb, TCA_ACT_INDEX, a->tcfa_index)) | |
245 | goto nla_put_failure; | |
246 | ||
247 | rcu_read_lock(); | |
248 | cookie = rcu_dereference(a->act_cookie); | |
249 | if (cookie) { | |
250 | if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) { | |
251 | rcu_read_unlock(); | |
252 | goto nla_put_failure; | |
253 | } | |
254 | } | |
255 | rcu_read_unlock(); | |
256 | ||
257 | return 0; | |
258 | ||
259 | nla_put_failure: | |
260 | nlmsg_trim(skb, b); | |
261 | return -1; | |
262 | } | |
263 | ||
65a206c0 | 264 | static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb, |
a85a970a | 265 | struct netlink_callback *cb) |
e9ce1cd3 | 266 | { |
65a206c0 | 267 | int err = 0, index = -1, s_i = 0, n_i = 0; |
90825b23 | 268 | u32 act_flags = cb->args[2]; |
e62e484d | 269 | unsigned long jiffy_since = cb->args[3]; |
4b3550ef | 270 | struct nlattr *nest; |
65a206c0 CM |
271 | struct idr *idr = &idrinfo->action_idr; |
272 | struct tc_action *p; | |
273 | unsigned long id = 1; | |
e33d2b74 | 274 | unsigned long tmp; |
e9ce1cd3 | 275 | |
95278dda | 276 | mutex_lock(&idrinfo->lock); |
e9ce1cd3 DM |
277 | |
278 | s_i = cb->args[0]; | |
279 | ||
e33d2b74 | 280 | idr_for_each_entry_ul(idr, p, tmp, id) { |
65a206c0 CM |
281 | index++; |
282 | if (index < s_i) | |
283 | continue; | |
580e4273 CW |
284 | if (IS_ERR(p)) |
285 | continue; | |
65a206c0 CM |
286 | |
287 | if (jiffy_since && | |
288 | time_after(jiffy_since, | |
289 | (unsigned long)p->tcfa_tm.lastuse)) | |
290 | continue; | |
291 | ||
ae0be8de | 292 | nest = nla_nest_start_noflag(skb, n_i); |
734549eb CD |
293 | if (!nest) { |
294 | index--; | |
65a206c0 | 295 | goto nla_put_failure; |
734549eb | 296 | } |
f460019b | 297 | err = (act_flags & TCA_ACT_FLAG_TERSE_DUMP) ? |
94f44f28 VB |
298 | tcf_action_dump_terse(skb, p, true) : |
299 | tcf_action_dump_1(skb, p, 0, 0); | |
65a206c0 CM |
300 | if (err < 0) { |
301 | index--; | |
302 | nlmsg_trim(skb, nest); | |
303 | goto done; | |
e9ce1cd3 | 304 | } |
65a206c0 CM |
305 | nla_nest_end(skb, nest); |
306 | n_i++; | |
f460019b | 307 | if (!(act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) && |
65a206c0 CM |
308 | n_i >= TCA_ACT_MAX_PRIO) |
309 | goto done; | |
e9ce1cd3 DM |
310 | } |
311 | done: | |
e62e484d JHS |
312 | if (index >= 0) |
313 | cb->args[0] = index + 1; | |
314 | ||
95278dda | 315 | mutex_unlock(&idrinfo->lock); |
90825b23 | 316 | if (n_i) { |
f460019b | 317 | if (act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) |
90825b23 JHS |
318 | cb->args[1] = n_i; |
319 | } | |
e9ce1cd3 DM |
320 | return n_i; |
321 | ||
7ba699c6 | 322 | nla_put_failure: |
4b3550ef | 323 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
324 | goto done; |
325 | } | |
326 | ||
ec3ed293 VB |
327 | static int tcf_idr_release_unsafe(struct tc_action *p) |
328 | { | |
329 | if (atomic_read(&p->tcfa_bindcnt) > 0) | |
330 | return -EPERM; | |
331 | ||
332 | if (refcount_dec_and_test(&p->tcfa_refcnt)) { | |
333 | idr_remove(&p->idrinfo->action_idr, p->tcfa_index); | |
334 | tcf_action_cleanup(p); | |
335 | return ACT_P_DELETED; | |
336 | } | |
337 | ||
338 | return 0; | |
339 | } | |
340 | ||
65a206c0 | 341 | static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb, |
a85a970a | 342 | const struct tc_action_ops *ops) |
e9ce1cd3 | 343 | { |
4b3550ef | 344 | struct nlattr *nest; |
65a206c0 | 345 | int n_i = 0; |
55334a5d | 346 | int ret = -EINVAL; |
65a206c0 CM |
347 | struct idr *idr = &idrinfo->action_idr; |
348 | struct tc_action *p; | |
349 | unsigned long id = 1; | |
e33d2b74 | 350 | unsigned long tmp; |
e9ce1cd3 | 351 | |
ae0be8de | 352 | nest = nla_nest_start_noflag(skb, 0); |
4b3550ef PM |
353 | if (nest == NULL) |
354 | goto nla_put_failure; | |
a85a970a | 355 | if (nla_put_string(skb, TCA_KIND, ops->kind)) |
1b34ec43 | 356 | goto nla_put_failure; |
65a206c0 | 357 | |
95278dda | 358 | mutex_lock(&idrinfo->lock); |
e33d2b74 | 359 | idr_for_each_entry_ul(idr, p, tmp, id) { |
0fedc63f CW |
360 | if (IS_ERR(p)) |
361 | continue; | |
ec3ed293 | 362 | ret = tcf_idr_release_unsafe(p); |
65a206c0 | 363 | if (ret == ACT_P_DELETED) { |
255cd50f | 364 | module_put(ops->owner); |
65a206c0 CM |
365 | n_i++; |
366 | } else if (ret < 0) { | |
95278dda | 367 | mutex_unlock(&idrinfo->lock); |
65a206c0 | 368 | goto nla_put_failure; |
e9ce1cd3 DM |
369 | } |
370 | } | |
95278dda | 371 | mutex_unlock(&idrinfo->lock); |
ec3ed293 | 372 | |
1b34ec43 DM |
373 | if (nla_put_u32(skb, TCA_FCNT, n_i)) |
374 | goto nla_put_failure; | |
4b3550ef | 375 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
376 | |
377 | return n_i; | |
7ba699c6 | 378 | nla_put_failure: |
4b3550ef | 379 | nla_nest_cancel(skb, nest); |
55334a5d | 380 | return ret; |
e9ce1cd3 DM |
381 | } |
382 | ||
ddf97ccd WC |
383 | int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, |
384 | struct netlink_callback *cb, int type, | |
b3620145 AA |
385 | const struct tc_action_ops *ops, |
386 | struct netlink_ext_ack *extack) | |
e9ce1cd3 | 387 | { |
65a206c0 | 388 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
ddf97ccd | 389 | |
e9ce1cd3 | 390 | if (type == RTM_DELACTION) { |
65a206c0 | 391 | return tcf_del_walker(idrinfo, skb, ops); |
e9ce1cd3 | 392 | } else if (type == RTM_GETACTION) { |
65a206c0 | 393 | return tcf_dump_walker(idrinfo, skb, cb); |
e9ce1cd3 | 394 | } else { |
b3620145 AA |
395 | WARN(1, "tcf_generic_walker: unknown command %d\n", type); |
396 | NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command"); | |
e9ce1cd3 DM |
397 | return -EINVAL; |
398 | } | |
399 | } | |
ddf97ccd | 400 | EXPORT_SYMBOL(tcf_generic_walker); |
e9ce1cd3 | 401 | |
7d485c45 | 402 | int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index) |
e9ce1cd3 | 403 | { |
3f7c72bc VB |
404 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
405 | struct tc_action *p; | |
e9ce1cd3 | 406 | |
95278dda | 407 | mutex_lock(&idrinfo->lock); |
322d884b | 408 | p = idr_find(&idrinfo->action_idr, index); |
7d485c45 | 409 | if (IS_ERR(p)) |
0190c1d4 | 410 | p = NULL; |
7d485c45 | 411 | else if (p) |
3f7c72bc | 412 | refcount_inc(&p->tcfa_refcnt); |
95278dda | 413 | mutex_unlock(&idrinfo->lock); |
e9ce1cd3 | 414 | |
3f7c72bc VB |
415 | if (p) { |
416 | *a = p; | |
417 | return true; | |
418 | } | |
419 | return false; | |
e9ce1cd3 | 420 | } |
65a206c0 | 421 | EXPORT_SYMBOL(tcf_idr_search); |
e9ce1cd3 | 422 | |
97a3f84f | 423 | static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index) |
2a2ea349 | 424 | { |
2a2ea349 VB |
425 | struct tc_action *p; |
426 | int ret = 0; | |
427 | ||
95278dda | 428 | mutex_lock(&idrinfo->lock); |
2a2ea349 VB |
429 | p = idr_find(&idrinfo->action_idr, index); |
430 | if (!p) { | |
95278dda | 431 | mutex_unlock(&idrinfo->lock); |
2a2ea349 VB |
432 | return -ENOENT; |
433 | } | |
434 | ||
435 | if (!atomic_read(&p->tcfa_bindcnt)) { | |
436 | if (refcount_dec_and_test(&p->tcfa_refcnt)) { | |
437 | struct module *owner = p->ops->owner; | |
438 | ||
439 | WARN_ON(p != idr_remove(&idrinfo->action_idr, | |
440 | p->tcfa_index)); | |
95278dda | 441 | mutex_unlock(&idrinfo->lock); |
2a2ea349 | 442 | |
16af6067 | 443 | tcf_action_cleanup(p); |
2a2ea349 VB |
444 | module_put(owner); |
445 | return 0; | |
446 | } | |
447 | ret = 0; | |
448 | } else { | |
449 | ret = -EPERM; | |
450 | } | |
451 | ||
95278dda | 452 | mutex_unlock(&idrinfo->lock); |
2a2ea349 VB |
453 | return ret; |
454 | } | |
2a2ea349 | 455 | |
65a206c0 CM |
456 | int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est, |
457 | struct tc_action **a, const struct tc_action_ops *ops, | |
e3822678 | 458 | int bind, bool cpustats, u32 flags) |
e9ce1cd3 | 459 | { |
ec0595cc | 460 | struct tc_action *p = kzalloc(ops->size, GFP_KERNEL); |
65a206c0 | 461 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
519c818e | 462 | int err = -ENOMEM; |
e9ce1cd3 DM |
463 | |
464 | if (unlikely(!p)) | |
86062033 | 465 | return -ENOMEM; |
036bb443 | 466 | refcount_set(&p->tcfa_refcnt, 1); |
e9ce1cd3 | 467 | if (bind) |
036bb443 | 468 | atomic_set(&p->tcfa_bindcnt, 1); |
e9ce1cd3 | 469 | |
519c818e ED |
470 | if (cpustats) { |
471 | p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); | |
339913a8 | 472 | if (!p->cpu_bstats) |
519c818e | 473 | goto err1; |
28169aba EC |
474 | p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); |
475 | if (!p->cpu_bstats_hw) | |
476 | goto err2; | |
339913a8 MW |
477 | p->cpu_qstats = alloc_percpu(struct gnet_stats_queue); |
478 | if (!p->cpu_qstats) | |
28169aba | 479 | goto err3; |
519c818e | 480 | } |
ec0595cc | 481 | spin_lock_init(&p->tcfa_lock); |
339913a8 | 482 | p->tcfa_index = index; |
ec0595cc WC |
483 | p->tcfa_tm.install = jiffies; |
484 | p->tcfa_tm.lastuse = jiffies; | |
485 | p->tcfa_tm.firstuse = 0; | |
e3822678 | 486 | p->tcfa_flags = flags; |
0e991ec6 | 487 | if (est) { |
ec0595cc WC |
488 | err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats, |
489 | &p->tcfa_rate_est, | |
490 | &p->tcfa_lock, NULL, est); | |
339913a8 | 491 | if (err) |
28169aba | 492 | goto err4; |
0e991ec6 SH |
493 | } |
494 | ||
65a206c0 | 495 | p->idrinfo = idrinfo; |
ec0595cc | 496 | p->ops = ops; |
ec0595cc | 497 | *a = p; |
86062033 | 498 | return 0; |
28169aba | 499 | err4: |
339913a8 | 500 | free_percpu(p->cpu_qstats); |
28169aba EC |
501 | err3: |
502 | free_percpu(p->cpu_bstats_hw); | |
339913a8 MW |
503 | err2: |
504 | free_percpu(p->cpu_bstats); | |
505 | err1: | |
506 | kfree(p); | |
507 | return err; | |
e9ce1cd3 | 508 | } |
65a206c0 | 509 | EXPORT_SYMBOL(tcf_idr_create); |
e9ce1cd3 | 510 | |
e3822678 VB |
511 | int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index, |
512 | struct nlattr *est, struct tc_action **a, | |
513 | const struct tc_action_ops *ops, int bind, | |
514 | u32 flags) | |
515 | { | |
516 | /* Set cpustats according to actions flags. */ | |
517 | return tcf_idr_create(tn, index, est, a, ops, bind, | |
518 | !(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags); | |
519 | } | |
520 | EXPORT_SYMBOL(tcf_idr_create_from_flags); | |
521 | ||
0190c1d4 VB |
522 | /* Cleanup idr index that was allocated but not initialized. */ |
523 | ||
524 | void tcf_idr_cleanup(struct tc_action_net *tn, u32 index) | |
525 | { | |
526 | struct tcf_idrinfo *idrinfo = tn->idrinfo; | |
527 | ||
95278dda | 528 | mutex_lock(&idrinfo->lock); |
0190c1d4 VB |
529 | /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */ |
530 | WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index))); | |
95278dda | 531 | mutex_unlock(&idrinfo->lock); |
0190c1d4 VB |
532 | } |
533 | EXPORT_SYMBOL(tcf_idr_cleanup); | |
534 | ||
535 | /* Check if action with specified index exists. If actions is found, increments | |
536 | * its reference and bind counters, and return 1. Otherwise insert temporary | |
537 | * error pointer (to prevent concurrent users from inserting actions with same | |
538 | * index) and return 0. | |
539 | */ | |
540 | ||
541 | int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, | |
542 | struct tc_action **a, int bind) | |
543 | { | |
544 | struct tcf_idrinfo *idrinfo = tn->idrinfo; | |
545 | struct tc_action *p; | |
546 | int ret; | |
547 | ||
548 | again: | |
95278dda | 549 | mutex_lock(&idrinfo->lock); |
0190c1d4 VB |
550 | if (*index) { |
551 | p = idr_find(&idrinfo->action_idr, *index); | |
552 | if (IS_ERR(p)) { | |
553 | /* This means that another process allocated | |
554 | * index but did not assign the pointer yet. | |
555 | */ | |
95278dda | 556 | mutex_unlock(&idrinfo->lock); |
0190c1d4 VB |
557 | goto again; |
558 | } | |
559 | ||
560 | if (p) { | |
561 | refcount_inc(&p->tcfa_refcnt); | |
562 | if (bind) | |
563 | atomic_inc(&p->tcfa_bindcnt); | |
564 | *a = p; | |
565 | ret = 1; | |
566 | } else { | |
567 | *a = NULL; | |
568 | ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index, | |
95278dda | 569 | *index, GFP_KERNEL); |
0190c1d4 VB |
570 | if (!ret) |
571 | idr_replace(&idrinfo->action_idr, | |
572 | ERR_PTR(-EBUSY), *index); | |
573 | } | |
574 | } else { | |
575 | *index = 1; | |
576 | *a = NULL; | |
577 | ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index, | |
95278dda | 578 | UINT_MAX, GFP_KERNEL); |
0190c1d4 VB |
579 | if (!ret) |
580 | idr_replace(&idrinfo->action_idr, ERR_PTR(-EBUSY), | |
581 | *index); | |
582 | } | |
95278dda | 583 | mutex_unlock(&idrinfo->lock); |
0190c1d4 VB |
584 | return ret; |
585 | } | |
586 | EXPORT_SYMBOL(tcf_idr_check_alloc); | |
587 | ||
65a206c0 CM |
588 | void tcf_idrinfo_destroy(const struct tc_action_ops *ops, |
589 | struct tcf_idrinfo *idrinfo) | |
1d4150c0 | 590 | { |
65a206c0 CM |
591 | struct idr *idr = &idrinfo->action_idr; |
592 | struct tc_action *p; | |
593 | int ret; | |
594 | unsigned long id = 1; | |
e33d2b74 | 595 | unsigned long tmp; |
1d4150c0 | 596 | |
e33d2b74 | 597 | idr_for_each_entry_ul(idr, p, tmp, id) { |
65a206c0 CM |
598 | ret = __tcf_idr_release(p, false, true); |
599 | if (ret == ACT_P_DELETED) | |
600 | module_put(ops->owner); | |
601 | else if (ret < 0) | |
602 | return; | |
1d4150c0 | 603 | } |
65a206c0 | 604 | idr_destroy(&idrinfo->action_idr); |
1d4150c0 | 605 | } |
65a206c0 | 606 | EXPORT_SYMBOL(tcf_idrinfo_destroy); |
1d4150c0 | 607 | |
1f747c26 | 608 | static LIST_HEAD(act_base); |
1da177e4 LT |
609 | static DEFINE_RWLOCK(act_mod_lock); |
610 | ||
ddf97ccd WC |
611 | int tcf_register_action(struct tc_action_ops *act, |
612 | struct pernet_operations *ops) | |
1da177e4 | 613 | { |
1f747c26 | 614 | struct tc_action_ops *a; |
ddf97ccd | 615 | int ret; |
1da177e4 | 616 | |
ddf97ccd | 617 | if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup) |
76c82d7a JHS |
618 | return -EINVAL; |
619 | ||
ab102b80 WC |
620 | /* We have to register pernet ops before making the action ops visible, |
621 | * otherwise tcf_action_init_1() could get a partially initialized | |
622 | * netns. | |
623 | */ | |
624 | ret = register_pernet_subsys(ops); | |
625 | if (ret) | |
626 | return ret; | |
627 | ||
1da177e4 | 628 | write_lock(&act_mod_lock); |
1f747c26 | 629 | list_for_each_entry(a, &act_base, head) { |
eddd2cf1 | 630 | if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) { |
1da177e4 | 631 | write_unlock(&act_mod_lock); |
ab102b80 | 632 | unregister_pernet_subsys(ops); |
1da177e4 LT |
633 | return -EEXIST; |
634 | } | |
635 | } | |
1f747c26 | 636 | list_add_tail(&act->head, &act_base); |
1da177e4 | 637 | write_unlock(&act_mod_lock); |
ddf97ccd | 638 | |
1da177e4 LT |
639 | return 0; |
640 | } | |
62e3ba1b | 641 | EXPORT_SYMBOL(tcf_register_action); |
1da177e4 | 642 | |
ddf97ccd WC |
643 | int tcf_unregister_action(struct tc_action_ops *act, |
644 | struct pernet_operations *ops) | |
1da177e4 | 645 | { |
1f747c26 | 646 | struct tc_action_ops *a; |
1da177e4 LT |
647 | int err = -ENOENT; |
648 | ||
649 | write_lock(&act_mod_lock); | |
a792866a ED |
650 | list_for_each_entry(a, &act_base, head) { |
651 | if (a == act) { | |
652 | list_del(&act->head); | |
653 | err = 0; | |
1da177e4 | 654 | break; |
a792866a | 655 | } |
1da177e4 LT |
656 | } |
657 | write_unlock(&act_mod_lock); | |
ab102b80 WC |
658 | if (!err) |
659 | unregister_pernet_subsys(ops); | |
1da177e4 LT |
660 | return err; |
661 | } | |
62e3ba1b | 662 | EXPORT_SYMBOL(tcf_unregister_action); |
1da177e4 LT |
663 | |
664 | /* lookup by name */ | |
665 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
666 | { | |
a792866a | 667 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
668 | |
669 | if (kind) { | |
670 | read_lock(&act_mod_lock); | |
1f747c26 | 671 | list_for_each_entry(a, &act_base, head) { |
1da177e4 | 672 | if (strcmp(kind, a->kind) == 0) { |
a792866a ED |
673 | if (try_module_get(a->owner)) |
674 | res = a; | |
1da177e4 LT |
675 | break; |
676 | } | |
677 | } | |
678 | read_unlock(&act_mod_lock); | |
679 | } | |
a792866a | 680 | return res; |
1da177e4 LT |
681 | } |
682 | ||
7ba699c6 PM |
683 | /* lookup by nlattr */ |
684 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) | |
1da177e4 | 685 | { |
a792866a | 686 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
687 | |
688 | if (kind) { | |
689 | read_lock(&act_mod_lock); | |
1f747c26 | 690 | list_for_each_entry(a, &act_base, head) { |
7ba699c6 | 691 | if (nla_strcmp(kind, a->kind) == 0) { |
a792866a ED |
692 | if (try_module_get(a->owner)) |
693 | res = a; | |
1da177e4 LT |
694 | break; |
695 | } | |
696 | } | |
697 | read_unlock(&act_mod_lock); | |
698 | } | |
a792866a | 699 | return res; |
1da177e4 | 700 | } |
1da177e4 | 701 | |
e5a4b17d | 702 | /*TCA_ACT_MAX_PRIO is 32, there count up to 32 */ |
e0ee84de | 703 | #define TCA_ACT_MAX_PRIO_MASK 0x1FF |
22dc13c8 WC |
704 | int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, |
705 | int nr_actions, struct tcf_result *res) | |
1da177e4 | 706 | { |
e0ee84de JHS |
707 | u32 jmp_prgcnt = 0; |
708 | u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */ | |
ec1a9cca JP |
709 | int i; |
710 | int ret = TC_ACT_OK; | |
1da177e4 | 711 | |
e7246e12 WB |
712 | if (skb_skip_tc_classify(skb)) |
713 | return TC_ACT_OK; | |
714 | ||
e0ee84de | 715 | restart_act_graph: |
22dc13c8 WC |
716 | for (i = 0; i < nr_actions; i++) { |
717 | const struct tc_action *a = actions[i]; | |
718 | ||
e0ee84de JHS |
719 | if (jmp_prgcnt > 0) { |
720 | jmp_prgcnt -= 1; | |
721 | continue; | |
722 | } | |
1da177e4 | 723 | repeat: |
63acd680 | 724 | ret = a->ops->act(skb, a, res); |
63acd680 JHS |
725 | if (ret == TC_ACT_REPEAT) |
726 | goto repeat; /* we need a ttl - JHS */ | |
e0ee84de | 727 | |
9da3242e | 728 | if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) { |
e0ee84de JHS |
729 | jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK; |
730 | if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) { | |
731 | /* faulty opcode, stop pipeline */ | |
732 | return TC_ACT_OK; | |
733 | } else { | |
734 | jmp_ttl -= 1; | |
735 | if (jmp_ttl > 0) | |
736 | goto restart_act_graph; | |
737 | else /* faulty graph, stop pipeline */ | |
738 | return TC_ACT_OK; | |
739 | } | |
db50514f | 740 | } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) { |
ee3bbfe8 DC |
741 | if (unlikely(!rcu_access_pointer(a->goto_chain))) { |
742 | net_warn_ratelimited("can't go to NULL chain!\n"); | |
743 | return TC_ACT_SHOT; | |
744 | } | |
db50514f | 745 | tcf_action_goto_chain_exec(a, res); |
e0ee84de JHS |
746 | } |
747 | ||
63acd680 | 748 | if (ret != TC_ACT_PIPE) |
e7246e12 | 749 | break; |
1da177e4 | 750 | } |
e0ee84de | 751 | |
1da177e4 LT |
752 | return ret; |
753 | } | |
62e3ba1b | 754 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 | 755 | |
90b73b77 | 756 | int tcf_action_destroy(struct tc_action *actions[], int bind) |
1da177e4 | 757 | { |
255cd50f | 758 | const struct tc_action_ops *ops; |
90b73b77 VB |
759 | struct tc_action *a; |
760 | int ret = 0, i; | |
1da177e4 | 761 | |
90b73b77 VB |
762 | for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) { |
763 | a = actions[i]; | |
764 | actions[i] = NULL; | |
255cd50f | 765 | ops = a->ops; |
65a206c0 | 766 | ret = __tcf_idr_release(a, bind, true); |
55334a5d | 767 | if (ret == ACT_P_DELETED) |
255cd50f | 768 | module_put(ops->owner); |
55334a5d WC |
769 | else if (ret < 0) |
770 | return ret; | |
1da177e4 | 771 | } |
55334a5d | 772 | return ret; |
1da177e4 LT |
773 | } |
774 | ||
16af6067 VB |
775 | static int tcf_action_put(struct tc_action *p) |
776 | { | |
777 | return __tcf_action_put(p, false); | |
778 | } | |
779 | ||
edfaf94f | 780 | /* Put all actions in this array, skip those NULL's. */ |
90b73b77 | 781 | static void tcf_action_put_many(struct tc_action *actions[]) |
cae422f3 | 782 | { |
90b73b77 | 783 | int i; |
cae422f3 | 784 | |
edfaf94f | 785 | for (i = 0; i < TCA_ACT_MAX_PRIO; i++) { |
90b73b77 | 786 | struct tc_action *a = actions[i]; |
edfaf94f | 787 | const struct tc_action_ops *ops; |
cae422f3 | 788 | |
edfaf94f CW |
789 | if (!a) |
790 | continue; | |
791 | ops = a->ops; | |
cae422f3 VB |
792 | if (tcf_action_put(a)) |
793 | module_put(ops->owner); | |
794 | } | |
795 | } | |
796 | ||
1da177e4 LT |
797 | int |
798 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
799 | { | |
1da177e4 LT |
800 | return a->ops->dump(skb, a, bind, ref); |
801 | } | |
802 | ||
ca44b738 VB |
803 | int |
804 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
805 | { | |
806 | int err = -EINVAL; | |
807 | unsigned char *b = skb_tail_pointer(skb); | |
808 | struct nlattr *nest; | |
809 | ||
94f44f28 | 810 | if (tcf_action_dump_terse(skb, a, false)) |
ca44b738 VB |
811 | goto nla_put_failure; |
812 | ||
8953b077 JP |
813 | if (a->hw_stats != TCA_ACT_HW_STATS_ANY && |
814 | nla_put_bitfield32(skb, TCA_ACT_HW_STATS, | |
815 | a->hw_stats, TCA_ACT_HW_STATS_ANY)) | |
816 | goto nla_put_failure; | |
e3822678 | 817 | |
93a129eb JP |
818 | if (a->used_hw_stats_valid && |
819 | nla_put_bitfield32(skb, TCA_ACT_USED_HW_STATS, | |
820 | a->used_hw_stats, TCA_ACT_HW_STATS_ANY)) | |
821 | goto nla_put_failure; | |
822 | ||
8953b077 JP |
823 | if (a->tcfa_flags && |
824 | nla_put_bitfield32(skb, TCA_ACT_FLAGS, | |
825 | a->tcfa_flags, a->tcfa_flags)) | |
826 | goto nla_put_failure; | |
e3822678 | 827 | |
ae0be8de | 828 | nest = nla_nest_start_noflag(skb, TCA_OPTIONS); |
4b3550ef PM |
829 | if (nest == NULL) |
830 | goto nla_put_failure; | |
cc7ec456 ED |
831 | err = tcf_action_dump_old(skb, a, bind, ref); |
832 | if (err > 0) { | |
4b3550ef | 833 | nla_nest_end(skb, nest); |
1da177e4 LT |
834 | return err; |
835 | } | |
836 | ||
7ba699c6 | 837 | nla_put_failure: |
dc5fc579 | 838 | nlmsg_trim(skb, b); |
1da177e4 LT |
839 | return -1; |
840 | } | |
62e3ba1b | 841 | EXPORT_SYMBOL(tcf_action_dump_1); |
1da177e4 | 842 | |
90b73b77 | 843 | int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], |
ca44b738 | 844 | int bind, int ref, bool terse) |
1da177e4 LT |
845 | { |
846 | struct tc_action *a; | |
90b73b77 | 847 | int err = -EINVAL, i; |
4b3550ef | 848 | struct nlattr *nest; |
1da177e4 | 849 | |
90b73b77 VB |
850 | for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) { |
851 | a = actions[i]; | |
4097e9d2 | 852 | nest = nla_nest_start_noflag(skb, i + 1); |
4b3550ef PM |
853 | if (nest == NULL) |
854 | goto nla_put_failure; | |
94f44f28 | 855 | err = terse ? tcf_action_dump_terse(skb, a, false) : |
ca44b738 | 856 | tcf_action_dump_1(skb, a, bind, ref); |
1da177e4 | 857 | if (err < 0) |
4fe683f5 | 858 | goto errout; |
4b3550ef | 859 | nla_nest_end(skb, nest); |
1da177e4 LT |
860 | } |
861 | ||
862 | return 0; | |
863 | ||
7ba699c6 | 864 | nla_put_failure: |
4fe683f5 TG |
865 | err = -EINVAL; |
866 | errout: | |
4b3550ef | 867 | nla_nest_cancel(skb, nest); |
4fe683f5 | 868 | return err; |
1da177e4 LT |
869 | } |
870 | ||
e0535ce5 | 871 | static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb) |
1045ba77 | 872 | { |
e0535ce5 WB |
873 | struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL); |
874 | if (!c) | |
875 | return NULL; | |
876 | ||
877 | c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL); | |
878 | if (!c->data) { | |
879 | kfree(c); | |
880 | return NULL; | |
1045ba77 | 881 | } |
e0535ce5 | 882 | c->len = nla_len(tb[TCA_ACT_COOKIE]); |
1045ba77 | 883 | |
e0535ce5 | 884 | return c; |
1045ba77 JHS |
885 | } |
886 | ||
0dfb2d82 | 887 | static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr) |
44f86580 | 888 | { |
0dfb2d82 | 889 | struct nla_bitfield32 hw_stats_bf; |
44f86580 JP |
890 | |
891 | /* If the user did not pass the attr, that means he does | |
892 | * not care about the type. Return "any" in that case | |
893 | * which is setting on all supported types. | |
894 | */ | |
0dfb2d82 JK |
895 | if (!hw_stats_attr) |
896 | return TCA_ACT_HW_STATS_ANY; | |
897 | hw_stats_bf = nla_get_bitfield32(hw_stats_attr); | |
898 | return hw_stats_bf.value; | |
44f86580 JP |
899 | } |
900 | ||
199ce850 | 901 | static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = { |
4b793fec | 902 | [TCA_ACT_KIND] = { .type = NLA_STRING }, |
199ce850 CW |
903 | [TCA_ACT_INDEX] = { .type = NLA_U32 }, |
904 | [TCA_ACT_COOKIE] = { .type = NLA_BINARY, | |
905 | .len = TC_COOKIE_MAX_SIZE }, | |
906 | [TCA_ACT_OPTIONS] = { .type = NLA_NESTED }, | |
47a1494b JB |
907 | [TCA_ACT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS), |
908 | [TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY), | |
199ce850 CW |
909 | }; |
910 | ||
0fedc63f | 911 | static void tcf_idr_insert_many(struct tc_action *actions[]) |
e49d8c22 | 912 | { |
0fedc63f | 913 | int i; |
e49d8c22 | 914 | |
0fedc63f CW |
915 | for (i = 0; i < TCA_ACT_MAX_PRIO; i++) { |
916 | struct tc_action *a = actions[i]; | |
917 | struct tcf_idrinfo *idrinfo; | |
918 | ||
919 | if (!a) | |
920 | continue; | |
921 | idrinfo = a->idrinfo; | |
922 | mutex_lock(&idrinfo->lock); | |
923 | /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc if | |
924 | * it is just created, otherwise this is just a nop. | |
925 | */ | |
926 | idr_replace(&idrinfo->action_idr, a, a->tcfa_index); | |
927 | mutex_unlock(&idrinfo->lock); | |
928 | } | |
e49d8c22 CW |
929 | } |
930 | ||
9fb9f251 JP |
931 | struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, |
932 | struct nlattr *nla, struct nlattr *est, | |
aea0d727 | 933 | char *name, int ovr, int bind, |
789871bb | 934 | bool rtnl_held, |
aea0d727 | 935 | struct netlink_ext_ack *extack) |
1da177e4 | 936 | { |
abbb0d33 | 937 | struct nla_bitfield32 flags = { 0, 0 }; |
0dfb2d82 | 938 | u8 hw_stats = TCA_ACT_HW_STATS_ANY; |
1da177e4 LT |
939 | struct tc_action *a; |
940 | struct tc_action_ops *a_o; | |
e0535ce5 | 941 | struct tc_cookie *cookie = NULL; |
1da177e4 | 942 | char act_name[IFNAMSIZ]; |
cc7ec456 | 943 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 944 | struct nlattr *kind; |
ab27cfb8 | 945 | int err; |
1da177e4 | 946 | |
1da177e4 | 947 | if (name == NULL) { |
199ce850 CW |
948 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, |
949 | tcf_action_policy, extack); | |
cee63723 | 950 | if (err < 0) |
1da177e4 | 951 | goto err_out; |
cee63723 | 952 | err = -EINVAL; |
7ba699c6 | 953 | kind = tb[TCA_ACT_KIND]; |
84ae017a AA |
954 | if (!kind) { |
955 | NL_SET_ERR_MSG(extack, "TC action kind must be specified"); | |
1da177e4 | 956 | goto err_out; |
84ae017a | 957 | } |
872f6903 | 958 | if (nla_strscpy(act_name, kind, IFNAMSIZ) < 0) { |
4b793fec CW |
959 | NL_SET_ERR_MSG(extack, "TC action name too long"); |
960 | goto err_out; | |
961 | } | |
199ce850 | 962 | if (tb[TCA_ACT_COOKIE]) { |
e0535ce5 WB |
963 | cookie = nla_memdup_cookie(tb); |
964 | if (!cookie) { | |
84ae017a | 965 | NL_SET_ERR_MSG(extack, "No memory to generate TC cookie"); |
e0535ce5 WB |
966 | err = -ENOMEM; |
967 | goto err_out; | |
968 | } | |
969 | } | |
0dfb2d82 | 970 | hw_stats = tcf_action_hw_stats_get(tb[TCA_ACT_HW_STATS]); |
abbb0d33 VB |
971 | if (tb[TCA_ACT_FLAGS]) |
972 | flags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]); | |
1da177e4 | 973 | } else { |
84ae017a AA |
974 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) { |
975 | NL_SET_ERR_MSG(extack, "TC action name too long"); | |
976 | err = -EINVAL; | |
1da177e4 | 977 | goto err_out; |
84ae017a | 978 | } |
1da177e4 LT |
979 | } |
980 | ||
981 | a_o = tc_lookup_action_n(act_name); | |
982 | if (a_o == NULL) { | |
95a5afca | 983 | #ifdef CONFIG_MODULES |
789871bb VB |
984 | if (rtnl_held) |
985 | rtnl_unlock(); | |
4bba3925 | 986 | request_module("act_%s", act_name); |
789871bb VB |
987 | if (rtnl_held) |
988 | rtnl_lock(); | |
1da177e4 LT |
989 | |
990 | a_o = tc_lookup_action_n(act_name); | |
991 | ||
992 | /* We dropped the RTNL semaphore in order to | |
993 | * perform the module load. So, even if we | |
994 | * succeeded in loading the module we have to | |
995 | * tell the caller to replay the request. We | |
996 | * indicate this using -EAGAIN. | |
997 | */ | |
998 | if (a_o != NULL) { | |
ab27cfb8 | 999 | err = -EAGAIN; |
1da177e4 LT |
1000 | goto err_mod; |
1001 | } | |
1002 | #endif | |
84ae017a | 1003 | NL_SET_ERR_MSG(extack, "Failed to load TC action module"); |
ab27cfb8 | 1004 | err = -ENOENT; |
c1f1f16c | 1005 | goto err_free; |
1da177e4 LT |
1006 | } |
1007 | ||
1da177e4 LT |
1008 | /* backward compatibility for policer */ |
1009 | if (name == NULL) | |
589dad6d | 1010 | err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind, |
abbb0d33 | 1011 | rtnl_held, tp, flags.value, extack); |
1da177e4 | 1012 | else |
789871bb | 1013 | err = a_o->init(net, nla, est, &a, ovr, bind, rtnl_held, |
abbb0d33 | 1014 | tp, flags.value, extack); |
ab27cfb8 | 1015 | if (err < 0) |
a85a970a | 1016 | goto err_mod; |
1da177e4 | 1017 | |
eec94fdb VB |
1018 | if (!name && tb[TCA_ACT_COOKIE]) |
1019 | tcf_set_action_cookie(&a->act_cookie, cookie); | |
1045ba77 | 1020 | |
44f86580 | 1021 | if (!name) |
0dfb2d82 | 1022 | a->hw_stats = hw_stats; |
44f86580 | 1023 | |
1da177e4 | 1024 | /* module count goes up only when brand new policy is created |
cc7ec456 ED |
1025 | * if it exists and is only bound to in a_o->init() then |
1026 | * ACT_P_CREATED is not returned (a zero is). | |
1027 | */ | |
ab27cfb8 | 1028 | if (err != ACT_P_CREATED) |
1da177e4 | 1029 | module_put(a_o->owner); |
1da177e4 | 1030 | |
1da177e4 LT |
1031 | return a; |
1032 | ||
1da177e4 LT |
1033 | err_mod: |
1034 | module_put(a_o->owner); | |
c1f1f16c | 1035 | err_free: |
e0535ce5 WB |
1036 | if (cookie) { |
1037 | kfree(cookie->data); | |
1038 | kfree(cookie); | |
1039 | } | |
c1f1f16c | 1040 | err_out: |
ab27cfb8 | 1041 | return ERR_PTR(err); |
1da177e4 LT |
1042 | } |
1043 | ||
90b73b77 VB |
1044 | /* Returns numbers of initialized actions or negative error. */ |
1045 | ||
9fb9f251 JP |
1046 | int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, |
1047 | struct nlattr *est, char *name, int ovr, int bind, | |
90b73b77 | 1048 | struct tc_action *actions[], size_t *attr_size, |
789871bb | 1049 | bool rtnl_held, struct netlink_ext_ack *extack) |
1da177e4 | 1050 | { |
cc7ec456 | 1051 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 | 1052 | struct tc_action *act; |
4e76e75d | 1053 | size_t sz = 0; |
cee63723 | 1054 | int err; |
1da177e4 LT |
1055 | int i; |
1056 | ||
8cb08174 JB |
1057 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL, |
1058 | extack); | |
cee63723 | 1059 | if (err < 0) |
33be6271 | 1060 | return err; |
1da177e4 | 1061 | |
7ba699c6 | 1062 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
aea0d727 | 1063 | act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind, |
789871bb | 1064 | rtnl_held, extack); |
33be6271 WC |
1065 | if (IS_ERR(act)) { |
1066 | err = PTR_ERR(act); | |
1da177e4 | 1067 | goto err; |
33be6271 | 1068 | } |
4e76e75d | 1069 | sz += tcf_action_fill_size(act); |
90b73b77 VB |
1070 | /* Start from index 0 */ |
1071 | actions[i - 1] = act; | |
1da177e4 | 1072 | } |
aecc5cef | 1073 | |
0fedc63f CW |
1074 | /* We have to commit them all together, because if any error happened in |
1075 | * between, we could not handle the failure gracefully. | |
1076 | */ | |
1077 | tcf_idr_insert_many(actions); | |
1078 | ||
4e76e75d | 1079 | *attr_size = tcf_action_full_attrs_size(sz); |
90b73b77 | 1080 | return i - 1; |
1da177e4 LT |
1081 | |
1082 | err: | |
33be6271 WC |
1083 | tcf_action_destroy(actions, bind); |
1084 | return err; | |
1da177e4 LT |
1085 | } |
1086 | ||
4b61d3e8 PL |
1087 | void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets, |
1088 | u64 drops, bool hw) | |
c8ecebd0 | 1089 | { |
5e174d5e VB |
1090 | if (a->cpu_bstats) { |
1091 | _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), bytes, packets); | |
c8ecebd0 | 1092 | |
4b61d3e8 | 1093 | this_cpu_ptr(a->cpu_qstats)->drops += drops; |
5e174d5e VB |
1094 | |
1095 | if (hw) | |
1096 | _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats_hw), | |
1097 | bytes, packets); | |
1098 | return; | |
1099 | } | |
c8ecebd0 | 1100 | |
5e174d5e | 1101 | _bstats_update(&a->tcfa_bstats, bytes, packets); |
4b61d3e8 | 1102 | a->tcfa_qstats.drops += drops; |
c8ecebd0 | 1103 | if (hw) |
5e174d5e | 1104 | _bstats_update(&a->tcfa_bstats_hw, bytes, packets); |
c8ecebd0 VB |
1105 | } |
1106 | EXPORT_SYMBOL(tcf_action_update_stats); | |
1107 | ||
ec0595cc | 1108 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p, |
1da177e4 LT |
1109 | int compat_mode) |
1110 | { | |
1111 | int err = 0; | |
1112 | struct gnet_dump d; | |
10297b99 | 1113 | |
7eb8896d | 1114 | if (p == NULL) |
1da177e4 LT |
1115 | goto errout; |
1116 | ||
1117 | /* compat_mode being true specifies a call that is supposed | |
06fe9fb4 | 1118 | * to add additional backward compatibility statistic TLVs. |
1da177e4 LT |
1119 | */ |
1120 | if (compat_mode) { | |
ec0595cc | 1121 | if (p->type == TCA_OLD_COMPAT) |
1da177e4 | 1122 | err = gnet_stats_start_copy_compat(skb, 0, |
9854518e ND |
1123 | TCA_STATS, |
1124 | TCA_XSTATS, | |
ec0595cc | 1125 | &p->tcfa_lock, &d, |
9854518e | 1126 | TCA_PAD); |
1da177e4 LT |
1127 | else |
1128 | return 0; | |
1129 | } else | |
1130 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
ec0595cc | 1131 | &p->tcfa_lock, &d, TCA_ACT_PAD); |
1da177e4 LT |
1132 | |
1133 | if (err < 0) | |
1134 | goto errout; | |
1135 | ||
ec0595cc | 1136 | if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 || |
28169aba EC |
1137 | gnet_stats_copy_basic_hw(NULL, &d, p->cpu_bstats_hw, |
1138 | &p->tcfa_bstats_hw) < 0 || | |
1c0d32fd | 1139 | gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 || |
519c818e | 1140 | gnet_stats_copy_queue(&d, p->cpu_qstats, |
ec0595cc WC |
1141 | &p->tcfa_qstats, |
1142 | p->tcfa_qstats.qlen) < 0) | |
1da177e4 LT |
1143 | goto errout; |
1144 | ||
1145 | if (gnet_stats_finish_copy(&d) < 0) | |
1146 | goto errout; | |
1147 | ||
1148 | return 0; | |
1149 | ||
1150 | errout: | |
1151 | return -1; | |
1152 | } | |
1153 | ||
90b73b77 | 1154 | static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[], |
0b0f43fe JHS |
1155 | u32 portid, u32 seq, u16 flags, int event, int bind, |
1156 | int ref) | |
1da177e4 LT |
1157 | { |
1158 | struct tcamsg *t; | |
1159 | struct nlmsghdr *nlh; | |
27a884dc | 1160 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1161 | struct nlattr *nest; |
1da177e4 | 1162 | |
15e47304 | 1163 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags); |
8b00a53c DM |
1164 | if (!nlh) |
1165 | goto out_nlmsg_trim; | |
1166 | t = nlmsg_data(nlh); | |
1da177e4 | 1167 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1168 | t->tca__pad1 = 0; |
1169 | t->tca__pad2 = 0; | |
10297b99 | 1170 | |
ae0be8de | 1171 | nest = nla_nest_start_noflag(skb, TCA_ACT_TAB); |
1af85155 | 1172 | if (!nest) |
8b00a53c | 1173 | goto out_nlmsg_trim; |
1da177e4 | 1174 | |
ca44b738 | 1175 | if (tcf_action_dump(skb, actions, bind, ref, false) < 0) |
8b00a53c | 1176 | goto out_nlmsg_trim; |
1da177e4 | 1177 | |
4b3550ef | 1178 | nla_nest_end(skb, nest); |
10297b99 | 1179 | |
27a884dc | 1180 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1181 | return skb->len; |
1182 | ||
8b00a53c | 1183 | out_nlmsg_trim: |
dc5fc579 | 1184 | nlmsg_trim(skb, b); |
1da177e4 LT |
1185 | return -1; |
1186 | } | |
1187 | ||
1188 | static int | |
c4c4290c | 1189 | tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n, |
90b73b77 | 1190 | struct tc_action *actions[], int event, |
84ae017a | 1191 | struct netlink_ext_ack *extack) |
1da177e4 LT |
1192 | { |
1193 | struct sk_buff *skb; | |
1da177e4 LT |
1194 | |
1195 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1196 | if (!skb) | |
1197 | return -ENOBUFS; | |
0b0f43fe | 1198 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, |
3f7c72bc | 1199 | 0, 1) <= 0) { |
84ae017a | 1200 | NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action"); |
1da177e4 LT |
1201 | kfree_skb(skb); |
1202 | return -EINVAL; | |
1203 | } | |
2942e900 | 1204 | |
15e47304 | 1205 | return rtnl_unicast(skb, net, portid); |
1da177e4 LT |
1206 | } |
1207 | ||
ddf97ccd | 1208 | static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla, |
84ae017a AA |
1209 | struct nlmsghdr *n, u32 portid, |
1210 | struct netlink_ext_ack *extack) | |
1da177e4 | 1211 | { |
cc7ec456 | 1212 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
a85a970a | 1213 | const struct tc_action_ops *ops; |
1da177e4 LT |
1214 | struct tc_action *a; |
1215 | int index; | |
ab27cfb8 | 1216 | int err; |
1da177e4 | 1217 | |
199ce850 CW |
1218 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, |
1219 | tcf_action_policy, extack); | |
cee63723 | 1220 | if (err < 0) |
ab27cfb8 | 1221 | goto err_out; |
1da177e4 | 1222 | |
cee63723 | 1223 | err = -EINVAL; |
7ba699c6 | 1224 | if (tb[TCA_ACT_INDEX] == NULL || |
84ae017a AA |
1225 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) { |
1226 | NL_SET_ERR_MSG(extack, "Invalid TC action index value"); | |
ab27cfb8 | 1227 | goto err_out; |
84ae017a | 1228 | } |
1587bac4 | 1229 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 1230 | |
ab27cfb8 | 1231 | err = -EINVAL; |
a85a970a | 1232 | ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
84ae017a | 1233 | if (!ops) { /* could happen in batch of actions */ |
f061b48c | 1234 | NL_SET_ERR_MSG(extack, "Specified TC action kind not found"); |
a85a970a | 1235 | goto err_out; |
84ae017a | 1236 | } |
ab27cfb8 | 1237 | err = -ENOENT; |
f061b48c CW |
1238 | if (ops->lookup(net, &a, index) == 0) { |
1239 | NL_SET_ERR_MSG(extack, "TC action with specified index not found"); | |
1da177e4 | 1240 | goto err_mod; |
f061b48c | 1241 | } |
1da177e4 | 1242 | |
a85a970a | 1243 | module_put(ops->owner); |
1da177e4 | 1244 | return a; |
ab27cfb8 | 1245 | |
1da177e4 | 1246 | err_mod: |
a85a970a | 1247 | module_put(ops->owner); |
ab27cfb8 PM |
1248 | err_out: |
1249 | return ERR_PTR(err); | |
1da177e4 LT |
1250 | } |
1251 | ||
7316ae88 | 1252 | static int tca_action_flush(struct net *net, struct nlattr *nla, |
84ae017a AA |
1253 | struct nlmsghdr *n, u32 portid, |
1254 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
1255 | { |
1256 | struct sk_buff *skb; | |
1257 | unsigned char *b; | |
1258 | struct nlmsghdr *nlh; | |
1259 | struct tcamsg *t; | |
1260 | struct netlink_callback dcb; | |
4b3550ef | 1261 | struct nlattr *nest; |
cc7ec456 | 1262 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
a85a970a | 1263 | const struct tc_action_ops *ops; |
7ba699c6 | 1264 | struct nlattr *kind; |
36723873 | 1265 | int err = -ENOMEM; |
1da177e4 | 1266 | |
1da177e4 | 1267 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
84ae017a | 1268 | if (!skb) |
36723873 | 1269 | return err; |
1da177e4 | 1270 | |
27a884dc | 1271 | b = skb_tail_pointer(skb); |
1da177e4 | 1272 | |
199ce850 CW |
1273 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, |
1274 | tcf_action_policy, extack); | |
cee63723 | 1275 | if (err < 0) |
1da177e4 LT |
1276 | goto err_out; |
1277 | ||
cee63723 | 1278 | err = -EINVAL; |
7ba699c6 | 1279 | kind = tb[TCA_ACT_KIND]; |
a85a970a | 1280 | ops = tc_lookup_action(kind); |
84ae017a AA |
1281 | if (!ops) { /*some idjot trying to flush unknown action */ |
1282 | NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action"); | |
1da177e4 | 1283 | goto err_out; |
84ae017a | 1284 | } |
1da177e4 | 1285 | |
0b0f43fe JHS |
1286 | nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, |
1287 | sizeof(*t), 0); | |
84ae017a AA |
1288 | if (!nlh) { |
1289 | NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification"); | |
8b00a53c | 1290 | goto out_module_put; |
84ae017a | 1291 | } |
8b00a53c | 1292 | t = nlmsg_data(nlh); |
1da177e4 | 1293 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1294 | t->tca__pad1 = 0; |
1295 | t->tca__pad2 = 0; | |
1da177e4 | 1296 | |
ae0be8de | 1297 | nest = nla_nest_start_noflag(skb, TCA_ACT_TAB); |
84ae017a AA |
1298 | if (!nest) { |
1299 | NL_SET_ERR_MSG(extack, "Failed to add new netlink message"); | |
8b00a53c | 1300 | goto out_module_put; |
84ae017a | 1301 | } |
1da177e4 | 1302 | |
41780105 | 1303 | err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops, extack); |
66dede2d DC |
1304 | if (err <= 0) { |
1305 | nla_nest_cancel(skb, nest); | |
8b00a53c | 1306 | goto out_module_put; |
66dede2d | 1307 | } |
1da177e4 | 1308 | |
4b3550ef | 1309 | nla_nest_end(skb, nest); |
1da177e4 | 1310 | |
27a884dc | 1311 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 | 1312 | nlh->nlmsg_flags |= NLM_F_ROOT; |
a85a970a | 1313 | module_put(ops->owner); |
15e47304 | 1314 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 1315 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
1316 | if (err > 0) |
1317 | return 0; | |
84ae017a AA |
1318 | if (err < 0) |
1319 | NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification"); | |
1da177e4 LT |
1320 | |
1321 | return err; | |
1322 | ||
8b00a53c | 1323 | out_module_put: |
a85a970a | 1324 | module_put(ops->owner); |
1da177e4 LT |
1325 | err_out: |
1326 | kfree_skb(skb); | |
1da177e4 LT |
1327 | return err; |
1328 | } | |
1329 | ||
b144e7ec | 1330 | static int tcf_action_delete(struct net *net, struct tc_action *actions[]) |
16af6067 | 1331 | { |
97a3f84f | 1332 | int i; |
16af6067 | 1333 | |
90b73b77 VB |
1334 | for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) { |
1335 | struct tc_action *a = actions[i]; | |
16af6067 | 1336 | const struct tc_action_ops *ops = a->ops; |
16af6067 VB |
1337 | /* Actions can be deleted concurrently so we must save their |
1338 | * type and id to search again after reference is released. | |
1339 | */ | |
97a3f84f CW |
1340 | struct tcf_idrinfo *idrinfo = a->idrinfo; |
1341 | u32 act_index = a->tcfa_index; | |
16af6067 | 1342 | |
c10bbfae | 1343 | actions[i] = NULL; |
16af6067 VB |
1344 | if (tcf_action_put(a)) { |
1345 | /* last reference, action was deleted concurrently */ | |
1346 | module_put(ops->owner); | |
1347 | } else { | |
97a3f84f CW |
1348 | int ret; |
1349 | ||
16af6067 | 1350 | /* now do the delete */ |
97a3f84f | 1351 | ret = tcf_idr_delete_index(idrinfo, act_index); |
edfaf94f | 1352 | if (ret < 0) |
16af6067 VB |
1353 | return ret; |
1354 | } | |
1355 | } | |
1356 | return 0; | |
1357 | } | |
1358 | ||
a56e1953 | 1359 | static int |
90b73b77 | 1360 | tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[], |
edfaf94f | 1361 | u32 portid, size_t attr_size, struct netlink_ext_ack *extack) |
a56e1953 WC |
1362 | { |
1363 | int ret; | |
1364 | struct sk_buff *skb; | |
1365 | ||
d04e6990 RM |
1366 | skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size, |
1367 | GFP_KERNEL); | |
a56e1953 WC |
1368 | if (!skb) |
1369 | return -ENOBUFS; | |
1370 | ||
1371 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION, | |
3f7c72bc | 1372 | 0, 2) <= 0) { |
84ae017a | 1373 | NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes"); |
a56e1953 WC |
1374 | kfree_skb(skb); |
1375 | return -EINVAL; | |
1376 | } | |
1377 | ||
1378 | /* now do the delete */ | |
b144e7ec | 1379 | ret = tcf_action_delete(net, actions); |
55334a5d | 1380 | if (ret < 0) { |
84ae017a | 1381 | NL_SET_ERR_MSG(extack, "Failed to delete TC action"); |
55334a5d WC |
1382 | kfree_skb(skb); |
1383 | return ret; | |
1384 | } | |
a56e1953 WC |
1385 | |
1386 | ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
1387 | n->nlmsg_flags & NLM_F_ECHO); | |
1388 | if (ret > 0) | |
1389 | return 0; | |
1390 | return ret; | |
1391 | } | |
1392 | ||
1da177e4 | 1393 | static int |
7316ae88 | 1394 | tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
84ae017a | 1395 | u32 portid, int event, struct netlink_ext_ack *extack) |
1da177e4 | 1396 | { |
cee63723 | 1397 | int i, ret; |
cc7ec456 | 1398 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 | 1399 | struct tc_action *act; |
d04e6990 | 1400 | size_t attr_size = 0; |
edfaf94f | 1401 | struct tc_action *actions[TCA_ACT_MAX_PRIO] = {}; |
1da177e4 | 1402 | |
8cb08174 JB |
1403 | ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL, |
1404 | extack); | |
cee63723 PM |
1405 | if (ret < 0) |
1406 | return ret; | |
1da177e4 | 1407 | |
cc7ec456 | 1408 | if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) { |
1af85155 | 1409 | if (tb[1]) |
84ae017a | 1410 | return tca_action_flush(net, tb[1], n, portid, extack); |
1af85155 | 1411 | |
84ae017a | 1412 | NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action"); |
1af85155 | 1413 | return -EINVAL; |
1da177e4 LT |
1414 | } |
1415 | ||
7ba699c6 | 1416 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
84ae017a | 1417 | act = tcf_action_get_1(net, tb[i], n, portid, extack); |
ab27cfb8 PM |
1418 | if (IS_ERR(act)) { |
1419 | ret = PTR_ERR(act); | |
1da177e4 | 1420 | goto err; |
ab27cfb8 | 1421 | } |
4e76e75d | 1422 | attr_size += tcf_action_fill_size(act); |
90b73b77 | 1423 | actions[i - 1] = act; |
1da177e4 | 1424 | } |
4e76e75d RM |
1425 | |
1426 | attr_size = tcf_action_full_attrs_size(attr_size); | |
1da177e4 LT |
1427 | |
1428 | if (event == RTM_GETACTION) | |
90b73b77 | 1429 | ret = tcf_get_notify(net, portid, n, actions, event, extack); |
1da177e4 | 1430 | else { /* delete */ |
edfaf94f | 1431 | ret = tcf_del_notify(net, n, actions, portid, attr_size, extack); |
a56e1953 | 1432 | if (ret) |
1da177e4 | 1433 | goto err; |
edfaf94f | 1434 | return 0; |
1da177e4 LT |
1435 | } |
1436 | err: | |
edfaf94f | 1437 | tcf_action_put_many(actions); |
1da177e4 LT |
1438 | return ret; |
1439 | } | |
1440 | ||
a56e1953 | 1441 | static int |
90b73b77 | 1442 | tcf_add_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[], |
d04e6990 | 1443 | u32 portid, size_t attr_size, struct netlink_ext_ack *extack) |
1da177e4 | 1444 | { |
1da177e4 | 1445 | struct sk_buff *skb; |
1da177e4 LT |
1446 | int err = 0; |
1447 | ||
d04e6990 RM |
1448 | skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size, |
1449 | GFP_KERNEL); | |
1da177e4 LT |
1450 | if (!skb) |
1451 | return -ENOBUFS; | |
1452 | ||
a56e1953 WC |
1453 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags, |
1454 | RTM_NEWACTION, 0, 0) <= 0) { | |
d143b9e3 | 1455 | NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action"); |
a56e1953 WC |
1456 | kfree_skb(skb); |
1457 | return -EINVAL; | |
1458 | } | |
10297b99 | 1459 | |
a56e1953 WC |
1460 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
1461 | n->nlmsg_flags & NLM_F_ECHO); | |
1da177e4 LT |
1462 | if (err > 0) |
1463 | err = 0; | |
1464 | return err; | |
1da177e4 LT |
1465 | } |
1466 | ||
5a7a5555 | 1467 | static int tcf_action_add(struct net *net, struct nlattr *nla, |
aea0d727 AA |
1468 | struct nlmsghdr *n, u32 portid, int ovr, |
1469 | struct netlink_ext_ack *extack) | |
1da177e4 | 1470 | { |
d04e6990 | 1471 | size_t attr_size = 0; |
39f13ea2 | 1472 | int loop, ret; |
90b73b77 | 1473 | struct tc_action *actions[TCA_ACT_MAX_PRIO] = {}; |
1da177e4 | 1474 | |
39f13ea2 ED |
1475 | for (loop = 0; loop < 10; loop++) { |
1476 | ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0, | |
1477 | actions, &attr_size, true, extack); | |
1478 | if (ret != -EAGAIN) | |
1479 | break; | |
1480 | } | |
1481 | ||
90b73b77 | 1482 | if (ret < 0) |
f07fed82 | 1483 | return ret; |
90b73b77 | 1484 | ret = tcf_add_notify(net, n, actions, portid, attr_size, extack); |
cae422f3 | 1485 | if (ovr) |
90b73b77 | 1486 | tcf_action_put_many(actions); |
1da177e4 | 1487 | |
cae422f3 | 1488 | return ret; |
1da177e4 LT |
1489 | } |
1490 | ||
90825b23 | 1491 | static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = { |
f460019b VB |
1492 | [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON | |
1493 | TCA_ACT_FLAG_TERSE_DUMP), | |
e62e484d | 1494 | [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 }, |
90825b23 JHS |
1495 | }; |
1496 | ||
c21ef3e3 DA |
1497 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, |
1498 | struct netlink_ext_ack *extack) | |
1da177e4 | 1499 | { |
3b1e0a65 | 1500 | struct net *net = sock_net(skb->sk); |
90825b23 | 1501 | struct nlattr *tca[TCA_ROOT_MAX + 1]; |
8bf15395 | 1502 | u32 portid = NETLINK_CB(skb).portid; |
1da177e4 LT |
1503 | int ret = 0, ovr = 0; |
1504 | ||
0b0f43fe JHS |
1505 | if ((n->nlmsg_type != RTM_GETACTION) && |
1506 | !netlink_capable(skb, CAP_NET_ADMIN)) | |
dfc47ef8 EB |
1507 | return -EPERM; |
1508 | ||
8cb08174 JB |
1509 | ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca, |
1510 | TCA_ROOT_MAX, NULL, extack); | |
7ba699c6 PM |
1511 | if (ret < 0) |
1512 | return ret; | |
1513 | ||
1514 | if (tca[TCA_ACT_TAB] == NULL) { | |
84ae017a | 1515 | NL_SET_ERR_MSG(extack, "Netlink action attributes missing"); |
1da177e4 LT |
1516 | return -EINVAL; |
1517 | } | |
1518 | ||
cc7ec456 | 1519 | /* n->nlmsg_flags & NLM_F_CREATE */ |
1da177e4 LT |
1520 | switch (n->nlmsg_type) { |
1521 | case RTM_NEWACTION: | |
1522 | /* we are going to assume all other flags | |
25985edc | 1523 | * imply create only if it doesn't exist |
1da177e4 LT |
1524 | * Note that CREATE | EXCL implies that |
1525 | * but since we want avoid ambiguity (eg when flags | |
1526 | * is zero) then just set this | |
1527 | */ | |
cc7ec456 | 1528 | if (n->nlmsg_flags & NLM_F_REPLACE) |
1da177e4 | 1529 | ovr = 1; |
aea0d727 AA |
1530 | ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr, |
1531 | extack); | |
1da177e4 LT |
1532 | break; |
1533 | case RTM_DELACTION: | |
7316ae88 | 1534 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
84ae017a | 1535 | portid, RTM_DELACTION, extack); |
1da177e4 LT |
1536 | break; |
1537 | case RTM_GETACTION: | |
7316ae88 | 1538 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
84ae017a | 1539 | portid, RTM_GETACTION, extack); |
1da177e4 LT |
1540 | break; |
1541 | default: | |
1542 | BUG(); | |
1543 | } | |
1544 | ||
1545 | return ret; | |
1546 | } | |
1547 | ||
90825b23 | 1548 | static struct nlattr *find_dump_kind(struct nlattr **nla) |
1da177e4 | 1549 | { |
cc7ec456 | 1550 | struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1]; |
7ba699c6 | 1551 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
7ba699c6 | 1552 | struct nlattr *kind; |
1da177e4 | 1553 | |
7ba699c6 | 1554 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
1555 | if (tb1 == NULL) |
1556 | return NULL; | |
1557 | ||
8cb08174 | 1558 | if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0) |
1da177e4 | 1559 | return NULL; |
1da177e4 | 1560 | |
6d834e04 PM |
1561 | if (tb[1] == NULL) |
1562 | return NULL; | |
199ce850 | 1563 | if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0) |
1da177e4 | 1564 | return NULL; |
7ba699c6 | 1565 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 1566 | |
26dab893 | 1567 | return kind; |
1da177e4 LT |
1568 | } |
1569 | ||
5a7a5555 | 1570 | static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 1571 | { |
ddf97ccd | 1572 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1573 | struct nlmsghdr *nlh; |
27a884dc | 1574 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1575 | struct nlattr *nest; |
1da177e4 | 1576 | struct tc_action_ops *a_o; |
1da177e4 | 1577 | int ret = 0; |
8b00a53c | 1578 | struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh); |
90825b23 JHS |
1579 | struct nlattr *tb[TCA_ROOT_MAX + 1]; |
1580 | struct nlattr *count_attr = NULL; | |
e62e484d | 1581 | unsigned long jiffy_since = 0; |
90825b23 JHS |
1582 | struct nlattr *kind = NULL; |
1583 | struct nla_bitfield32 bf; | |
e62e484d | 1584 | u32 msecs_since = 0; |
90825b23 JHS |
1585 | u32 act_count = 0; |
1586 | ||
8cb08174 JB |
1587 | ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb, |
1588 | TCA_ROOT_MAX, tcaa_policy, cb->extack); | |
90825b23 JHS |
1589 | if (ret < 0) |
1590 | return ret; | |
1da177e4 | 1591 | |
90825b23 | 1592 | kind = find_dump_kind(tb); |
1da177e4 | 1593 | if (kind == NULL) { |
6ff9c364 | 1594 | pr_info("tc_dump_action: action bad kind\n"); |
1da177e4 LT |
1595 | return 0; |
1596 | } | |
1597 | ||
26dab893 | 1598 | a_o = tc_lookup_action(kind); |
cc7ec456 | 1599 | if (a_o == NULL) |
1da177e4 | 1600 | return 0; |
1da177e4 | 1601 | |
90825b23 JHS |
1602 | cb->args[2] = 0; |
1603 | if (tb[TCA_ROOT_FLAGS]) { | |
1604 | bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]); | |
1605 | cb->args[2] = bf.value; | |
1606 | } | |
1607 | ||
e62e484d JHS |
1608 | if (tb[TCA_ROOT_TIME_DELTA]) { |
1609 | msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]); | |
1610 | } | |
1611 | ||
15e47304 | 1612 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
8b00a53c DM |
1613 | cb->nlh->nlmsg_type, sizeof(*t), 0); |
1614 | if (!nlh) | |
1615 | goto out_module_put; | |
90825b23 | 1616 | |
e62e484d JHS |
1617 | if (msecs_since) |
1618 | jiffy_since = jiffies - msecs_to_jiffies(msecs_since); | |
1619 | ||
8b00a53c | 1620 | t = nlmsg_data(nlh); |
1da177e4 | 1621 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1622 | t->tca__pad1 = 0; |
1623 | t->tca__pad2 = 0; | |
e62e484d | 1624 | cb->args[3] = jiffy_since; |
90825b23 JHS |
1625 | count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32)); |
1626 | if (!count_attr) | |
1627 | goto out_module_put; | |
1da177e4 | 1628 | |
ae0be8de | 1629 | nest = nla_nest_start_noflag(skb, TCA_ACT_TAB); |
4b3550ef | 1630 | if (nest == NULL) |
8b00a53c | 1631 | goto out_module_put; |
1da177e4 | 1632 | |
41780105 | 1633 | ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o, NULL); |
1da177e4 | 1634 | if (ret < 0) |
8b00a53c | 1635 | goto out_module_put; |
1da177e4 LT |
1636 | |
1637 | if (ret > 0) { | |
4b3550ef | 1638 | nla_nest_end(skb, nest); |
1da177e4 | 1639 | ret = skb->len; |
90825b23 JHS |
1640 | act_count = cb->args[1]; |
1641 | memcpy(nla_data(count_attr), &act_count, sizeof(u32)); | |
1642 | cb->args[1] = 0; | |
1da177e4 | 1643 | } else |
ebecaa66 | 1644 | nlmsg_trim(skb, b); |
1da177e4 | 1645 | |
27a884dc | 1646 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
15e47304 | 1647 | if (NETLINK_CB(cb->skb).portid && ret) |
1da177e4 LT |
1648 | nlh->nlmsg_flags |= NLM_F_MULTI; |
1649 | module_put(a_o->owner); | |
1650 | return skb->len; | |
1651 | ||
8b00a53c | 1652 | out_module_put: |
1da177e4 | 1653 | module_put(a_o->owner); |
dc5fc579 | 1654 | nlmsg_trim(skb, b); |
1da177e4 LT |
1655 | return skb->len; |
1656 | } | |
1657 | ||
1658 | static int __init tc_action_init(void) | |
1659 | { | |
b97bac64 FW |
1660 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0); |
1661 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0); | |
c7ac8679 | 1662 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, |
b97bac64 | 1663 | 0); |
1da177e4 | 1664 | |
1da177e4 LT |
1665 | return 0; |
1666 | } | |
1667 | ||
1668 | subsys_initcall(tc_action_init); |