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 | ||
b3650bf7 | 161 | static 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 | } | |
b3650bf7 VB |
187 | |
188 | int tcf_idr_release(struct tc_action *a, bool bind) | |
189 | { | |
190 | const struct tc_action_ops *ops = a->ops; | |
191 | int ret; | |
192 | ||
193 | ret = __tcf_idr_release(a, bind, false); | |
194 | if (ret == ACT_P_DELETED) | |
195 | module_put(ops->owner); | |
196 | return ret; | |
197 | } | |
198 | EXPORT_SYMBOL(tcf_idr_release); | |
e9ce1cd3 | 199 | |
4e76e75d RM |
200 | static size_t tcf_action_shared_attrs_size(const struct tc_action *act) |
201 | { | |
e0479b67 | 202 | struct tc_cookie *act_cookie; |
4e76e75d RM |
203 | u32 cookie_len = 0; |
204 | ||
e0479b67 VB |
205 | rcu_read_lock(); |
206 | act_cookie = rcu_dereference(act->act_cookie); | |
207 | ||
208 | if (act_cookie) | |
209 | cookie_len = nla_total_size(act_cookie->len); | |
210 | rcu_read_unlock(); | |
4e76e75d RM |
211 | |
212 | return nla_total_size(0) /* action number nested */ | |
213 | + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */ | |
214 | + cookie_len /* TCA_ACT_COOKIE */ | |
0dfb2d82 | 215 | + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */ |
4e76e75d | 216 | + nla_total_size(0) /* TCA_ACT_STATS nested */ |
1521a67e | 217 | + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_FLAGS */ |
4e76e75d RM |
218 | /* TCA_STATS_BASIC */ |
219 | + nla_total_size_64bit(sizeof(struct gnet_stats_basic)) | |
b33e699f ED |
220 | /* TCA_STATS_PKT64 */ |
221 | + nla_total_size_64bit(sizeof(u64)) | |
4e76e75d RM |
222 | /* TCA_STATS_QUEUE */ |
223 | + nla_total_size_64bit(sizeof(struct gnet_stats_queue)) | |
224 | + nla_total_size(0) /* TCA_OPTIONS nested */ | |
225 | + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */ | |
226 | } | |
227 | ||
228 | static size_t tcf_action_full_attrs_size(size_t sz) | |
229 | { | |
230 | return NLMSG_HDRLEN /* struct nlmsghdr */ | |
231 | + sizeof(struct tcamsg) | |
232 | + nla_total_size(0) /* TCA_ACT_TAB nested */ | |
233 | + sz; | |
234 | } | |
235 | ||
236 | static size_t tcf_action_fill_size(const struct tc_action *act) | |
237 | { | |
238 | size_t sz = tcf_action_shared_attrs_size(act); | |
239 | ||
240 | if (act->ops->get_fill_size) | |
241 | return act->ops->get_fill_size(act) + sz; | |
242 | return sz; | |
243 | } | |
244 | ||
94f44f28 VB |
245 | static int |
246 | tcf_action_dump_terse(struct sk_buff *skb, struct tc_action *a, bool from_act) | |
247 | { | |
248 | unsigned char *b = skb_tail_pointer(skb); | |
249 | struct tc_cookie *cookie; | |
250 | ||
251 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) | |
252 | goto nla_put_failure; | |
253 | if (tcf_action_copy_stats(skb, a, 0)) | |
254 | goto nla_put_failure; | |
255 | if (from_act && nla_put_u32(skb, TCA_ACT_INDEX, a->tcfa_index)) | |
256 | goto nla_put_failure; | |
257 | ||
258 | rcu_read_lock(); | |
259 | cookie = rcu_dereference(a->act_cookie); | |
260 | if (cookie) { | |
261 | if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) { | |
262 | rcu_read_unlock(); | |
263 | goto nla_put_failure; | |
264 | } | |
265 | } | |
266 | rcu_read_unlock(); | |
267 | ||
268 | return 0; | |
269 | ||
270 | nla_put_failure: | |
271 | nlmsg_trim(skb, b); | |
272 | return -1; | |
273 | } | |
274 | ||
65a206c0 | 275 | static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb, |
a85a970a | 276 | struct netlink_callback *cb) |
e9ce1cd3 | 277 | { |
65a206c0 | 278 | int err = 0, index = -1, s_i = 0, n_i = 0; |
90825b23 | 279 | u32 act_flags = cb->args[2]; |
e62e484d | 280 | unsigned long jiffy_since = cb->args[3]; |
4b3550ef | 281 | struct nlattr *nest; |
65a206c0 CM |
282 | struct idr *idr = &idrinfo->action_idr; |
283 | struct tc_action *p; | |
284 | unsigned long id = 1; | |
e33d2b74 | 285 | unsigned long tmp; |
e9ce1cd3 | 286 | |
95278dda | 287 | mutex_lock(&idrinfo->lock); |
e9ce1cd3 DM |
288 | |
289 | s_i = cb->args[0]; | |
290 | ||
e33d2b74 | 291 | idr_for_each_entry_ul(idr, p, tmp, id) { |
65a206c0 CM |
292 | index++; |
293 | if (index < s_i) | |
294 | continue; | |
580e4273 CW |
295 | if (IS_ERR(p)) |
296 | continue; | |
65a206c0 CM |
297 | |
298 | if (jiffy_since && | |
299 | time_after(jiffy_since, | |
300 | (unsigned long)p->tcfa_tm.lastuse)) | |
301 | continue; | |
302 | ||
ae0be8de | 303 | nest = nla_nest_start_noflag(skb, n_i); |
734549eb CD |
304 | if (!nest) { |
305 | index--; | |
65a206c0 | 306 | goto nla_put_failure; |
734549eb | 307 | } |
f460019b | 308 | err = (act_flags & TCA_ACT_FLAG_TERSE_DUMP) ? |
94f44f28 VB |
309 | tcf_action_dump_terse(skb, p, true) : |
310 | tcf_action_dump_1(skb, p, 0, 0); | |
65a206c0 CM |
311 | if (err < 0) { |
312 | index--; | |
313 | nlmsg_trim(skb, nest); | |
314 | goto done; | |
e9ce1cd3 | 315 | } |
65a206c0 CM |
316 | nla_nest_end(skb, nest); |
317 | n_i++; | |
f460019b | 318 | if (!(act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) && |
65a206c0 CM |
319 | n_i >= TCA_ACT_MAX_PRIO) |
320 | goto done; | |
e9ce1cd3 DM |
321 | } |
322 | done: | |
e62e484d JHS |
323 | if (index >= 0) |
324 | cb->args[0] = index + 1; | |
325 | ||
95278dda | 326 | mutex_unlock(&idrinfo->lock); |
90825b23 | 327 | if (n_i) { |
f460019b | 328 | if (act_flags & TCA_ACT_FLAG_LARGE_DUMP_ON) |
90825b23 JHS |
329 | cb->args[1] = n_i; |
330 | } | |
e9ce1cd3 DM |
331 | return n_i; |
332 | ||
7ba699c6 | 333 | nla_put_failure: |
4b3550ef | 334 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
335 | goto done; |
336 | } | |
337 | ||
ec3ed293 VB |
338 | static int tcf_idr_release_unsafe(struct tc_action *p) |
339 | { | |
340 | if (atomic_read(&p->tcfa_bindcnt) > 0) | |
341 | return -EPERM; | |
342 | ||
343 | if (refcount_dec_and_test(&p->tcfa_refcnt)) { | |
344 | idr_remove(&p->idrinfo->action_idr, p->tcfa_index); | |
345 | tcf_action_cleanup(p); | |
346 | return ACT_P_DELETED; | |
347 | } | |
348 | ||
349 | return 0; | |
350 | } | |
351 | ||
65a206c0 | 352 | static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb, |
a85a970a | 353 | const struct tc_action_ops *ops) |
e9ce1cd3 | 354 | { |
4b3550ef | 355 | struct nlattr *nest; |
65a206c0 | 356 | int n_i = 0; |
55334a5d | 357 | int ret = -EINVAL; |
65a206c0 CM |
358 | struct idr *idr = &idrinfo->action_idr; |
359 | struct tc_action *p; | |
360 | unsigned long id = 1; | |
e33d2b74 | 361 | unsigned long tmp; |
e9ce1cd3 | 362 | |
ae0be8de | 363 | nest = nla_nest_start_noflag(skb, 0); |
4b3550ef PM |
364 | if (nest == NULL) |
365 | goto nla_put_failure; | |
a85a970a | 366 | if (nla_put_string(skb, TCA_KIND, ops->kind)) |
1b34ec43 | 367 | goto nla_put_failure; |
65a206c0 | 368 | |
95278dda | 369 | mutex_lock(&idrinfo->lock); |
e33d2b74 | 370 | idr_for_each_entry_ul(idr, p, tmp, id) { |
0fedc63f CW |
371 | if (IS_ERR(p)) |
372 | continue; | |
ec3ed293 | 373 | ret = tcf_idr_release_unsafe(p); |
65a206c0 | 374 | if (ret == ACT_P_DELETED) { |
255cd50f | 375 | module_put(ops->owner); |
65a206c0 CM |
376 | n_i++; |
377 | } else if (ret < 0) { | |
95278dda | 378 | mutex_unlock(&idrinfo->lock); |
65a206c0 | 379 | goto nla_put_failure; |
e9ce1cd3 DM |
380 | } |
381 | } | |
95278dda | 382 | mutex_unlock(&idrinfo->lock); |
ec3ed293 | 383 | |
55d96f72 YY |
384 | ret = nla_put_u32(skb, TCA_FCNT, n_i); |
385 | if (ret) | |
1b34ec43 | 386 | goto nla_put_failure; |
4b3550ef | 387 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
388 | |
389 | return n_i; | |
7ba699c6 | 390 | nla_put_failure: |
4b3550ef | 391 | nla_nest_cancel(skb, nest); |
55334a5d | 392 | return ret; |
e9ce1cd3 DM |
393 | } |
394 | ||
ddf97ccd WC |
395 | int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, |
396 | struct netlink_callback *cb, int type, | |
b3620145 AA |
397 | const struct tc_action_ops *ops, |
398 | struct netlink_ext_ack *extack) | |
e9ce1cd3 | 399 | { |
65a206c0 | 400 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
ddf97ccd | 401 | |
e9ce1cd3 | 402 | if (type == RTM_DELACTION) { |
65a206c0 | 403 | return tcf_del_walker(idrinfo, skb, ops); |
e9ce1cd3 | 404 | } else if (type == RTM_GETACTION) { |
65a206c0 | 405 | return tcf_dump_walker(idrinfo, skb, cb); |
e9ce1cd3 | 406 | } else { |
b3620145 AA |
407 | WARN(1, "tcf_generic_walker: unknown command %d\n", type); |
408 | NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command"); | |
e9ce1cd3 DM |
409 | return -EINVAL; |
410 | } | |
411 | } | |
ddf97ccd | 412 | EXPORT_SYMBOL(tcf_generic_walker); |
e9ce1cd3 | 413 | |
7d485c45 | 414 | int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index) |
e9ce1cd3 | 415 | { |
3f7c72bc VB |
416 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
417 | struct tc_action *p; | |
e9ce1cd3 | 418 | |
95278dda | 419 | mutex_lock(&idrinfo->lock); |
322d884b | 420 | p = idr_find(&idrinfo->action_idr, index); |
7d485c45 | 421 | if (IS_ERR(p)) |
0190c1d4 | 422 | p = NULL; |
7d485c45 | 423 | else if (p) |
3f7c72bc | 424 | refcount_inc(&p->tcfa_refcnt); |
95278dda | 425 | mutex_unlock(&idrinfo->lock); |
e9ce1cd3 | 426 | |
3f7c72bc VB |
427 | if (p) { |
428 | *a = p; | |
429 | return true; | |
430 | } | |
431 | return false; | |
e9ce1cd3 | 432 | } |
65a206c0 | 433 | EXPORT_SYMBOL(tcf_idr_search); |
e9ce1cd3 | 434 | |
97a3f84f | 435 | static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index) |
2a2ea349 | 436 | { |
2a2ea349 VB |
437 | struct tc_action *p; |
438 | int ret = 0; | |
439 | ||
95278dda | 440 | mutex_lock(&idrinfo->lock); |
2a2ea349 VB |
441 | p = idr_find(&idrinfo->action_idr, index); |
442 | if (!p) { | |
95278dda | 443 | mutex_unlock(&idrinfo->lock); |
2a2ea349 VB |
444 | return -ENOENT; |
445 | } | |
446 | ||
447 | if (!atomic_read(&p->tcfa_bindcnt)) { | |
448 | if (refcount_dec_and_test(&p->tcfa_refcnt)) { | |
449 | struct module *owner = p->ops->owner; | |
450 | ||
451 | WARN_ON(p != idr_remove(&idrinfo->action_idr, | |
452 | p->tcfa_index)); | |
95278dda | 453 | mutex_unlock(&idrinfo->lock); |
2a2ea349 | 454 | |
16af6067 | 455 | tcf_action_cleanup(p); |
2a2ea349 VB |
456 | module_put(owner); |
457 | return 0; | |
458 | } | |
459 | ret = 0; | |
460 | } else { | |
461 | ret = -EPERM; | |
462 | } | |
463 | ||
95278dda | 464 | mutex_unlock(&idrinfo->lock); |
2a2ea349 VB |
465 | return ret; |
466 | } | |
2a2ea349 | 467 | |
65a206c0 CM |
468 | int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est, |
469 | struct tc_action **a, const struct tc_action_ops *ops, | |
e3822678 | 470 | int bind, bool cpustats, u32 flags) |
e9ce1cd3 | 471 | { |
ec0595cc | 472 | struct tc_action *p = kzalloc(ops->size, GFP_KERNEL); |
65a206c0 | 473 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
519c818e | 474 | int err = -ENOMEM; |
e9ce1cd3 DM |
475 | |
476 | if (unlikely(!p)) | |
86062033 | 477 | return -ENOMEM; |
036bb443 | 478 | refcount_set(&p->tcfa_refcnt, 1); |
e9ce1cd3 | 479 | if (bind) |
036bb443 | 480 | atomic_set(&p->tcfa_bindcnt, 1); |
e9ce1cd3 | 481 | |
519c818e ED |
482 | if (cpustats) { |
483 | p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); | |
339913a8 | 484 | if (!p->cpu_bstats) |
519c818e | 485 | goto err1; |
28169aba EC |
486 | p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); |
487 | if (!p->cpu_bstats_hw) | |
488 | goto err2; | |
339913a8 MW |
489 | p->cpu_qstats = alloc_percpu(struct gnet_stats_queue); |
490 | if (!p->cpu_qstats) | |
28169aba | 491 | goto err3; |
519c818e | 492 | } |
ec0595cc | 493 | spin_lock_init(&p->tcfa_lock); |
339913a8 | 494 | p->tcfa_index = index; |
ec0595cc WC |
495 | p->tcfa_tm.install = jiffies; |
496 | p->tcfa_tm.lastuse = jiffies; | |
497 | p->tcfa_tm.firstuse = 0; | |
e3822678 | 498 | p->tcfa_flags = flags; |
0e991ec6 | 499 | if (est) { |
ec0595cc WC |
500 | err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats, |
501 | &p->tcfa_rate_est, | |
502 | &p->tcfa_lock, NULL, est); | |
339913a8 | 503 | if (err) |
28169aba | 504 | goto err4; |
0e991ec6 SH |
505 | } |
506 | ||
65a206c0 | 507 | p->idrinfo = idrinfo; |
b3650bf7 | 508 | __module_get(ops->owner); |
ec0595cc | 509 | p->ops = ops; |
ec0595cc | 510 | *a = p; |
86062033 | 511 | return 0; |
28169aba | 512 | err4: |
339913a8 | 513 | free_percpu(p->cpu_qstats); |
28169aba EC |
514 | err3: |
515 | free_percpu(p->cpu_bstats_hw); | |
339913a8 MW |
516 | err2: |
517 | free_percpu(p->cpu_bstats); | |
518 | err1: | |
519 | kfree(p); | |
520 | return err; | |
e9ce1cd3 | 521 | } |
65a206c0 | 522 | EXPORT_SYMBOL(tcf_idr_create); |
e9ce1cd3 | 523 | |
e3822678 VB |
524 | int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index, |
525 | struct nlattr *est, struct tc_action **a, | |
526 | const struct tc_action_ops *ops, int bind, | |
527 | u32 flags) | |
528 | { | |
529 | /* Set cpustats according to actions flags. */ | |
530 | return tcf_idr_create(tn, index, est, a, ops, bind, | |
531 | !(flags & TCA_ACT_FLAGS_NO_PERCPU_STATS), flags); | |
532 | } | |
533 | EXPORT_SYMBOL(tcf_idr_create_from_flags); | |
534 | ||
0190c1d4 VB |
535 | /* Cleanup idr index that was allocated but not initialized. */ |
536 | ||
537 | void tcf_idr_cleanup(struct tc_action_net *tn, u32 index) | |
538 | { | |
539 | struct tcf_idrinfo *idrinfo = tn->idrinfo; | |
540 | ||
95278dda | 541 | mutex_lock(&idrinfo->lock); |
0190c1d4 VB |
542 | /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */ |
543 | WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index))); | |
95278dda | 544 | mutex_unlock(&idrinfo->lock); |
0190c1d4 VB |
545 | } |
546 | EXPORT_SYMBOL(tcf_idr_cleanup); | |
547 | ||
548 | /* Check if action with specified index exists. If actions is found, increments | |
549 | * its reference and bind counters, and return 1. Otherwise insert temporary | |
550 | * error pointer (to prevent concurrent users from inserting actions with same | |
551 | * index) and return 0. | |
552 | */ | |
553 | ||
554 | int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, | |
555 | struct tc_action **a, int bind) | |
556 | { | |
557 | struct tcf_idrinfo *idrinfo = tn->idrinfo; | |
558 | struct tc_action *p; | |
559 | int ret; | |
560 | ||
561 | again: | |
95278dda | 562 | mutex_lock(&idrinfo->lock); |
0190c1d4 VB |
563 | if (*index) { |
564 | p = idr_find(&idrinfo->action_idr, *index); | |
565 | if (IS_ERR(p)) { | |
566 | /* This means that another process allocated | |
567 | * index but did not assign the pointer yet. | |
568 | */ | |
95278dda | 569 | mutex_unlock(&idrinfo->lock); |
0190c1d4 VB |
570 | goto again; |
571 | } | |
572 | ||
573 | if (p) { | |
574 | refcount_inc(&p->tcfa_refcnt); | |
575 | if (bind) | |
576 | atomic_inc(&p->tcfa_bindcnt); | |
577 | *a = p; | |
578 | ret = 1; | |
579 | } else { | |
580 | *a = NULL; | |
581 | ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index, | |
95278dda | 582 | *index, GFP_KERNEL); |
0190c1d4 VB |
583 | if (!ret) |
584 | idr_replace(&idrinfo->action_idr, | |
585 | ERR_PTR(-EBUSY), *index); | |
586 | } | |
587 | } else { | |
588 | *index = 1; | |
589 | *a = NULL; | |
590 | ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index, | |
95278dda | 591 | UINT_MAX, GFP_KERNEL); |
0190c1d4 VB |
592 | if (!ret) |
593 | idr_replace(&idrinfo->action_idr, ERR_PTR(-EBUSY), | |
594 | *index); | |
595 | } | |
95278dda | 596 | mutex_unlock(&idrinfo->lock); |
0190c1d4 VB |
597 | return ret; |
598 | } | |
599 | EXPORT_SYMBOL(tcf_idr_check_alloc); | |
600 | ||
65a206c0 CM |
601 | void tcf_idrinfo_destroy(const struct tc_action_ops *ops, |
602 | struct tcf_idrinfo *idrinfo) | |
1d4150c0 | 603 | { |
65a206c0 CM |
604 | struct idr *idr = &idrinfo->action_idr; |
605 | struct tc_action *p; | |
606 | int ret; | |
607 | unsigned long id = 1; | |
e33d2b74 | 608 | unsigned long tmp; |
1d4150c0 | 609 | |
e33d2b74 | 610 | idr_for_each_entry_ul(idr, p, tmp, id) { |
65a206c0 CM |
611 | ret = __tcf_idr_release(p, false, true); |
612 | if (ret == ACT_P_DELETED) | |
613 | module_put(ops->owner); | |
614 | else if (ret < 0) | |
615 | return; | |
1d4150c0 | 616 | } |
65a206c0 | 617 | idr_destroy(&idrinfo->action_idr); |
1d4150c0 | 618 | } |
65a206c0 | 619 | EXPORT_SYMBOL(tcf_idrinfo_destroy); |
1d4150c0 | 620 | |
1f747c26 | 621 | static LIST_HEAD(act_base); |
1da177e4 LT |
622 | static DEFINE_RWLOCK(act_mod_lock); |
623 | ||
ddf97ccd WC |
624 | int tcf_register_action(struct tc_action_ops *act, |
625 | struct pernet_operations *ops) | |
1da177e4 | 626 | { |
1f747c26 | 627 | struct tc_action_ops *a; |
ddf97ccd | 628 | int ret; |
1da177e4 | 629 | |
ddf97ccd | 630 | if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup) |
76c82d7a JHS |
631 | return -EINVAL; |
632 | ||
ab102b80 WC |
633 | /* We have to register pernet ops before making the action ops visible, |
634 | * otherwise tcf_action_init_1() could get a partially initialized | |
635 | * netns. | |
636 | */ | |
637 | ret = register_pernet_subsys(ops); | |
638 | if (ret) | |
639 | return ret; | |
640 | ||
1da177e4 | 641 | write_lock(&act_mod_lock); |
1f747c26 | 642 | list_for_each_entry(a, &act_base, head) { |
eddd2cf1 | 643 | if (act->id == a->id || (strcmp(act->kind, a->kind) == 0)) { |
1da177e4 | 644 | write_unlock(&act_mod_lock); |
ab102b80 | 645 | unregister_pernet_subsys(ops); |
1da177e4 LT |
646 | return -EEXIST; |
647 | } | |
648 | } | |
1f747c26 | 649 | list_add_tail(&act->head, &act_base); |
1da177e4 | 650 | write_unlock(&act_mod_lock); |
ddf97ccd | 651 | |
1da177e4 LT |
652 | return 0; |
653 | } | |
62e3ba1b | 654 | EXPORT_SYMBOL(tcf_register_action); |
1da177e4 | 655 | |
ddf97ccd WC |
656 | int tcf_unregister_action(struct tc_action_ops *act, |
657 | struct pernet_operations *ops) | |
1da177e4 | 658 | { |
1f747c26 | 659 | struct tc_action_ops *a; |
1da177e4 LT |
660 | int err = -ENOENT; |
661 | ||
662 | write_lock(&act_mod_lock); | |
a792866a ED |
663 | list_for_each_entry(a, &act_base, head) { |
664 | if (a == act) { | |
665 | list_del(&act->head); | |
666 | err = 0; | |
1da177e4 | 667 | break; |
a792866a | 668 | } |
1da177e4 LT |
669 | } |
670 | write_unlock(&act_mod_lock); | |
ab102b80 WC |
671 | if (!err) |
672 | unregister_pernet_subsys(ops); | |
1da177e4 LT |
673 | return err; |
674 | } | |
62e3ba1b | 675 | EXPORT_SYMBOL(tcf_unregister_action); |
1da177e4 LT |
676 | |
677 | /* lookup by name */ | |
678 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
679 | { | |
a792866a | 680 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
681 | |
682 | if (kind) { | |
683 | read_lock(&act_mod_lock); | |
1f747c26 | 684 | list_for_each_entry(a, &act_base, head) { |
1da177e4 | 685 | if (strcmp(kind, a->kind) == 0) { |
a792866a ED |
686 | if (try_module_get(a->owner)) |
687 | res = a; | |
1da177e4 LT |
688 | break; |
689 | } | |
690 | } | |
691 | read_unlock(&act_mod_lock); | |
692 | } | |
a792866a | 693 | return res; |
1da177e4 LT |
694 | } |
695 | ||
7ba699c6 PM |
696 | /* lookup by nlattr */ |
697 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) | |
1da177e4 | 698 | { |
a792866a | 699 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
700 | |
701 | if (kind) { | |
702 | read_lock(&act_mod_lock); | |
1f747c26 | 703 | list_for_each_entry(a, &act_base, head) { |
7ba699c6 | 704 | if (nla_strcmp(kind, a->kind) == 0) { |
a792866a ED |
705 | if (try_module_get(a->owner)) |
706 | res = a; | |
1da177e4 LT |
707 | break; |
708 | } | |
709 | } | |
710 | read_unlock(&act_mod_lock); | |
711 | } | |
a792866a | 712 | return res; |
1da177e4 | 713 | } |
1da177e4 | 714 | |
e5a4b17d | 715 | /*TCA_ACT_MAX_PRIO is 32, there count up to 32 */ |
e0ee84de | 716 | #define TCA_ACT_MAX_PRIO_MASK 0x1FF |
22dc13c8 WC |
717 | int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, |
718 | int nr_actions, struct tcf_result *res) | |
1da177e4 | 719 | { |
e0ee84de JHS |
720 | u32 jmp_prgcnt = 0; |
721 | u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */ | |
ec1a9cca JP |
722 | int i; |
723 | int ret = TC_ACT_OK; | |
1da177e4 | 724 | |
e7246e12 WB |
725 | if (skb_skip_tc_classify(skb)) |
726 | return TC_ACT_OK; | |
727 | ||
e0ee84de | 728 | restart_act_graph: |
22dc13c8 WC |
729 | for (i = 0; i < nr_actions; i++) { |
730 | const struct tc_action *a = actions[i]; | |
731 | ||
e0ee84de JHS |
732 | if (jmp_prgcnt > 0) { |
733 | jmp_prgcnt -= 1; | |
734 | continue; | |
735 | } | |
1da177e4 | 736 | repeat: |
63acd680 | 737 | ret = a->ops->act(skb, a, res); |
63acd680 JHS |
738 | if (ret == TC_ACT_REPEAT) |
739 | goto repeat; /* we need a ttl - JHS */ | |
e0ee84de | 740 | |
9da3242e | 741 | if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) { |
e0ee84de JHS |
742 | jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK; |
743 | if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) { | |
744 | /* faulty opcode, stop pipeline */ | |
745 | return TC_ACT_OK; | |
746 | } else { | |
747 | jmp_ttl -= 1; | |
748 | if (jmp_ttl > 0) | |
749 | goto restart_act_graph; | |
750 | else /* faulty graph, stop pipeline */ | |
751 | return TC_ACT_OK; | |
752 | } | |
db50514f | 753 | } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) { |
ee3bbfe8 DC |
754 | if (unlikely(!rcu_access_pointer(a->goto_chain))) { |
755 | net_warn_ratelimited("can't go to NULL chain!\n"); | |
756 | return TC_ACT_SHOT; | |
757 | } | |
db50514f | 758 | tcf_action_goto_chain_exec(a, res); |
e0ee84de JHS |
759 | } |
760 | ||
63acd680 | 761 | if (ret != TC_ACT_PIPE) |
e7246e12 | 762 | break; |
1da177e4 | 763 | } |
e0ee84de | 764 | |
1da177e4 LT |
765 | return ret; |
766 | } | |
62e3ba1b | 767 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 | 768 | |
90b73b77 | 769 | int tcf_action_destroy(struct tc_action *actions[], int bind) |
1da177e4 | 770 | { |
255cd50f | 771 | const struct tc_action_ops *ops; |
90b73b77 VB |
772 | struct tc_action *a; |
773 | int ret = 0, i; | |
1da177e4 | 774 | |
90b73b77 VB |
775 | for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) { |
776 | a = actions[i]; | |
777 | actions[i] = NULL; | |
255cd50f | 778 | ops = a->ops; |
65a206c0 | 779 | ret = __tcf_idr_release(a, bind, true); |
55334a5d | 780 | if (ret == ACT_P_DELETED) |
255cd50f | 781 | module_put(ops->owner); |
55334a5d WC |
782 | else if (ret < 0) |
783 | return ret; | |
1da177e4 | 784 | } |
55334a5d | 785 | return ret; |
1da177e4 LT |
786 | } |
787 | ||
16af6067 VB |
788 | static int tcf_action_put(struct tc_action *p) |
789 | { | |
790 | return __tcf_action_put(p, false); | |
791 | } | |
792 | ||
edfaf94f | 793 | /* Put all actions in this array, skip those NULL's. */ |
90b73b77 | 794 | static void tcf_action_put_many(struct tc_action *actions[]) |
cae422f3 | 795 | { |
90b73b77 | 796 | int i; |
cae422f3 | 797 | |
edfaf94f | 798 | for (i = 0; i < TCA_ACT_MAX_PRIO; i++) { |
90b73b77 | 799 | struct tc_action *a = actions[i]; |
edfaf94f | 800 | const struct tc_action_ops *ops; |
cae422f3 | 801 | |
edfaf94f CW |
802 | if (!a) |
803 | continue; | |
804 | ops = a->ops; | |
cae422f3 VB |
805 | if (tcf_action_put(a)) |
806 | module_put(ops->owner); | |
807 | } | |
808 | } | |
809 | ||
1da177e4 LT |
810 | int |
811 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
812 | { | |
1da177e4 LT |
813 | return a->ops->dump(skb, a, bind, ref); |
814 | } | |
815 | ||
ca44b738 VB |
816 | int |
817 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
818 | { | |
819 | int err = -EINVAL; | |
820 | unsigned char *b = skb_tail_pointer(skb); | |
821 | struct nlattr *nest; | |
822 | ||
94f44f28 | 823 | if (tcf_action_dump_terse(skb, a, false)) |
ca44b738 VB |
824 | goto nla_put_failure; |
825 | ||
8953b077 JP |
826 | if (a->hw_stats != TCA_ACT_HW_STATS_ANY && |
827 | nla_put_bitfield32(skb, TCA_ACT_HW_STATS, | |
828 | a->hw_stats, TCA_ACT_HW_STATS_ANY)) | |
829 | goto nla_put_failure; | |
e3822678 | 830 | |
93a129eb JP |
831 | if (a->used_hw_stats_valid && |
832 | nla_put_bitfield32(skb, TCA_ACT_USED_HW_STATS, | |
833 | a->used_hw_stats, TCA_ACT_HW_STATS_ANY)) | |
834 | goto nla_put_failure; | |
835 | ||
8953b077 JP |
836 | if (a->tcfa_flags && |
837 | nla_put_bitfield32(skb, TCA_ACT_FLAGS, | |
838 | a->tcfa_flags, a->tcfa_flags)) | |
839 | goto nla_put_failure; | |
e3822678 | 840 | |
ae0be8de | 841 | nest = nla_nest_start_noflag(skb, TCA_OPTIONS); |
4b3550ef PM |
842 | if (nest == NULL) |
843 | goto nla_put_failure; | |
cc7ec456 ED |
844 | err = tcf_action_dump_old(skb, a, bind, ref); |
845 | if (err > 0) { | |
4b3550ef | 846 | nla_nest_end(skb, nest); |
1da177e4 LT |
847 | return err; |
848 | } | |
849 | ||
7ba699c6 | 850 | nla_put_failure: |
dc5fc579 | 851 | nlmsg_trim(skb, b); |
1da177e4 LT |
852 | return -1; |
853 | } | |
62e3ba1b | 854 | EXPORT_SYMBOL(tcf_action_dump_1); |
1da177e4 | 855 | |
90b73b77 | 856 | int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], |
ca44b738 | 857 | int bind, int ref, bool terse) |
1da177e4 LT |
858 | { |
859 | struct tc_action *a; | |
90b73b77 | 860 | int err = -EINVAL, i; |
4b3550ef | 861 | struct nlattr *nest; |
1da177e4 | 862 | |
90b73b77 VB |
863 | for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) { |
864 | a = actions[i]; | |
4097e9d2 | 865 | nest = nla_nest_start_noflag(skb, i + 1); |
4b3550ef PM |
866 | if (nest == NULL) |
867 | goto nla_put_failure; | |
94f44f28 | 868 | err = terse ? tcf_action_dump_terse(skb, a, false) : |
ca44b738 | 869 | tcf_action_dump_1(skb, a, bind, ref); |
1da177e4 | 870 | if (err < 0) |
4fe683f5 | 871 | goto errout; |
4b3550ef | 872 | nla_nest_end(skb, nest); |
1da177e4 LT |
873 | } |
874 | ||
875 | return 0; | |
876 | ||
7ba699c6 | 877 | nla_put_failure: |
4fe683f5 TG |
878 | err = -EINVAL; |
879 | errout: | |
4b3550ef | 880 | nla_nest_cancel(skb, nest); |
4fe683f5 | 881 | return err; |
1da177e4 LT |
882 | } |
883 | ||
e0535ce5 | 884 | static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb) |
1045ba77 | 885 | { |
e0535ce5 WB |
886 | struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL); |
887 | if (!c) | |
888 | return NULL; | |
889 | ||
890 | c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL); | |
891 | if (!c->data) { | |
892 | kfree(c); | |
893 | return NULL; | |
1045ba77 | 894 | } |
e0535ce5 | 895 | c->len = nla_len(tb[TCA_ACT_COOKIE]); |
1045ba77 | 896 | |
e0535ce5 | 897 | return c; |
1045ba77 JHS |
898 | } |
899 | ||
0dfb2d82 | 900 | static u8 tcf_action_hw_stats_get(struct nlattr *hw_stats_attr) |
44f86580 | 901 | { |
0dfb2d82 | 902 | struct nla_bitfield32 hw_stats_bf; |
44f86580 JP |
903 | |
904 | /* If the user did not pass the attr, that means he does | |
905 | * not care about the type. Return "any" in that case | |
906 | * which is setting on all supported types. | |
907 | */ | |
0dfb2d82 JK |
908 | if (!hw_stats_attr) |
909 | return TCA_ACT_HW_STATS_ANY; | |
910 | hw_stats_bf = nla_get_bitfield32(hw_stats_attr); | |
911 | return hw_stats_bf.value; | |
44f86580 JP |
912 | } |
913 | ||
199ce850 | 914 | static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = { |
4b793fec | 915 | [TCA_ACT_KIND] = { .type = NLA_STRING }, |
199ce850 CW |
916 | [TCA_ACT_INDEX] = { .type = NLA_U32 }, |
917 | [TCA_ACT_COOKIE] = { .type = NLA_BINARY, | |
918 | .len = TC_COOKIE_MAX_SIZE }, | |
919 | [TCA_ACT_OPTIONS] = { .type = NLA_NESTED }, | |
47a1494b JB |
920 | [TCA_ACT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAGS_NO_PERCPU_STATS), |
921 | [TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY), | |
199ce850 CW |
922 | }; |
923 | ||
396d7f23 | 924 | void tcf_idr_insert_many(struct tc_action *actions[]) |
e49d8c22 | 925 | { |
0fedc63f | 926 | int i; |
e49d8c22 | 927 | |
0fedc63f CW |
928 | for (i = 0; i < TCA_ACT_MAX_PRIO; i++) { |
929 | struct tc_action *a = actions[i]; | |
930 | struct tcf_idrinfo *idrinfo; | |
931 | ||
932 | if (!a) | |
933 | continue; | |
934 | idrinfo = a->idrinfo; | |
935 | mutex_lock(&idrinfo->lock); | |
936 | /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc if | |
937 | * it is just created, otherwise this is just a nop. | |
938 | */ | |
939 | idr_replace(&idrinfo->action_idr, a, a->tcfa_index); | |
940 | mutex_unlock(&idrinfo->lock); | |
941 | } | |
e49d8c22 CW |
942 | } |
943 | ||
d349f997 CW |
944 | struct tc_action_ops *tc_action_load_ops(char *name, struct nlattr *nla, |
945 | bool rtnl_held, | |
946 | struct netlink_ext_ack *extack) | |
1da177e4 | 947 | { |
d349f997 | 948 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
1da177e4 LT |
949 | struct tc_action_ops *a_o; |
950 | char act_name[IFNAMSIZ]; | |
7ba699c6 | 951 | struct nlattr *kind; |
ab27cfb8 | 952 | int err; |
1da177e4 | 953 | |
1da177e4 | 954 | if (name == NULL) { |
199ce850 CW |
955 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, |
956 | tcf_action_policy, extack); | |
cee63723 | 957 | if (err < 0) |
d349f997 | 958 | return ERR_PTR(err); |
cee63723 | 959 | err = -EINVAL; |
7ba699c6 | 960 | kind = tb[TCA_ACT_KIND]; |
84ae017a AA |
961 | if (!kind) { |
962 | NL_SET_ERR_MSG(extack, "TC action kind must be specified"); | |
d349f997 | 963 | return ERR_PTR(err); |
84ae017a | 964 | } |
872f6903 | 965 | if (nla_strscpy(act_name, kind, IFNAMSIZ) < 0) { |
4b793fec | 966 | NL_SET_ERR_MSG(extack, "TC action name too long"); |
d349f997 | 967 | return ERR_PTR(err); |
4b793fec | 968 | } |
1da177e4 | 969 | } else { |
84ae017a AA |
970 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) { |
971 | NL_SET_ERR_MSG(extack, "TC action name too long"); | |
d349f997 | 972 | return ERR_PTR(-EINVAL); |
84ae017a | 973 | } |
1da177e4 LT |
974 | } |
975 | ||
976 | a_o = tc_lookup_action_n(act_name); | |
977 | if (a_o == NULL) { | |
95a5afca | 978 | #ifdef CONFIG_MODULES |
789871bb VB |
979 | if (rtnl_held) |
980 | rtnl_unlock(); | |
4bba3925 | 981 | request_module("act_%s", act_name); |
789871bb VB |
982 | if (rtnl_held) |
983 | rtnl_lock(); | |
1da177e4 LT |
984 | |
985 | a_o = tc_lookup_action_n(act_name); | |
986 | ||
987 | /* We dropped the RTNL semaphore in order to | |
988 | * perform the module load. So, even if we | |
989 | * succeeded in loading the module we have to | |
990 | * tell the caller to replay the request. We | |
991 | * indicate this using -EAGAIN. | |
992 | */ | |
993 | if (a_o != NULL) { | |
d349f997 CW |
994 | module_put(a_o->owner); |
995 | return ERR_PTR(-EAGAIN); | |
1da177e4 LT |
996 | } |
997 | #endif | |
84ae017a | 998 | NL_SET_ERR_MSG(extack, "Failed to load TC action module"); |
d349f997 | 999 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
1000 | } |
1001 | ||
d349f997 CW |
1002 | return a_o; |
1003 | } | |
1004 | ||
1005 | struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, | |
1006 | struct nlattr *nla, struct nlattr *est, | |
1007 | char *name, int ovr, int bind, | |
87c750e8 VB |
1008 | struct tc_action_ops *a_o, int *init_res, |
1009 | bool rtnl_held, | |
d349f997 CW |
1010 | struct netlink_ext_ack *extack) |
1011 | { | |
1012 | struct nla_bitfield32 flags = { 0, 0 }; | |
1013 | u8 hw_stats = TCA_ACT_HW_STATS_ANY; | |
1014 | struct nlattr *tb[TCA_ACT_MAX + 1]; | |
1015 | struct tc_cookie *cookie = NULL; | |
1016 | struct tc_action *a; | |
1017 | int err; | |
1018 | ||
1da177e4 | 1019 | /* backward compatibility for policer */ |
d349f997 CW |
1020 | if (name == NULL) { |
1021 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, | |
1022 | tcf_action_policy, extack); | |
1023 | if (err < 0) | |
1024 | return ERR_PTR(err); | |
1025 | if (tb[TCA_ACT_COOKIE]) { | |
1026 | cookie = nla_memdup_cookie(tb); | |
1027 | if (!cookie) { | |
1028 | NL_SET_ERR_MSG(extack, "No memory to generate TC cookie"); | |
1029 | err = -ENOMEM; | |
1030 | goto err_out; | |
1031 | } | |
1032 | } | |
1033 | hw_stats = tcf_action_hw_stats_get(tb[TCA_ACT_HW_STATS]); | |
1034 | if (tb[TCA_ACT_FLAGS]) | |
1035 | flags = nla_get_bitfield32(tb[TCA_ACT_FLAGS]); | |
1036 | ||
589dad6d | 1037 | err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind, |
abbb0d33 | 1038 | rtnl_held, tp, flags.value, extack); |
d349f997 | 1039 | } else { |
789871bb | 1040 | err = a_o->init(net, nla, est, &a, ovr, bind, rtnl_held, |
abbb0d33 | 1041 | tp, flags.value, extack); |
d349f997 | 1042 | } |
ab27cfb8 | 1043 | if (err < 0) |
d349f997 | 1044 | goto err_out; |
87c750e8 | 1045 | *init_res = err; |
1da177e4 | 1046 | |
eec94fdb VB |
1047 | if (!name && tb[TCA_ACT_COOKIE]) |
1048 | tcf_set_action_cookie(&a->act_cookie, cookie); | |
1045ba77 | 1049 | |
44f86580 | 1050 | if (!name) |
0dfb2d82 | 1051 | a->hw_stats = hw_stats; |
44f86580 | 1052 | |
1da177e4 LT |
1053 | return a; |
1054 | ||
d349f997 | 1055 | err_out: |
e0535ce5 WB |
1056 | if (cookie) { |
1057 | kfree(cookie->data); | |
1058 | kfree(cookie); | |
1059 | } | |
ab27cfb8 | 1060 | return ERR_PTR(err); |
1da177e4 LT |
1061 | } |
1062 | ||
90b73b77 VB |
1063 | /* Returns numbers of initialized actions or negative error. */ |
1064 | ||
9fb9f251 JP |
1065 | int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, |
1066 | struct nlattr *est, char *name, int ovr, int bind, | |
87c750e8 | 1067 | struct tc_action *actions[], int init_res[], size_t *attr_size, |
789871bb | 1068 | bool rtnl_held, struct netlink_ext_ack *extack) |
1da177e4 | 1069 | { |
d349f997 | 1070 | struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {}; |
cc7ec456 | 1071 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 | 1072 | struct tc_action *act; |
4e76e75d | 1073 | size_t sz = 0; |
cee63723 | 1074 | int err; |
1da177e4 LT |
1075 | int i; |
1076 | ||
8cb08174 JB |
1077 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL, |
1078 | extack); | |
cee63723 | 1079 | if (err < 0) |
33be6271 | 1080 | return err; |
1da177e4 | 1081 | |
d349f997 CW |
1082 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
1083 | struct tc_action_ops *a_o; | |
1084 | ||
1085 | a_o = tc_action_load_ops(name, tb[i], rtnl_held, extack); | |
1086 | if (IS_ERR(a_o)) { | |
1087 | err = PTR_ERR(a_o); | |
1088 | goto err_mod; | |
1089 | } | |
1090 | ops[i - 1] = a_o; | |
1091 | } | |
1092 | ||
7ba699c6 | 1093 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
aea0d727 | 1094 | act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind, |
87c750e8 VB |
1095 | ops[i - 1], &init_res[i - 1], rtnl_held, |
1096 | extack); | |
33be6271 WC |
1097 | if (IS_ERR(act)) { |
1098 | err = PTR_ERR(act); | |
1da177e4 | 1099 | goto err; |
33be6271 | 1100 | } |
4e76e75d | 1101 | sz += tcf_action_fill_size(act); |
90b73b77 VB |
1102 | /* Start from index 0 */ |
1103 | actions[i - 1] = act; | |
1da177e4 | 1104 | } |
aecc5cef | 1105 | |
0fedc63f CW |
1106 | /* We have to commit them all together, because if any error happened in |
1107 | * between, we could not handle the failure gracefully. | |
1108 | */ | |
1109 | tcf_idr_insert_many(actions); | |
1110 | ||
4e76e75d | 1111 | *attr_size = tcf_action_full_attrs_size(sz); |
b3650bf7 VB |
1112 | err = i - 1; |
1113 | goto err_mod; | |
1da177e4 LT |
1114 | |
1115 | err: | |
33be6271 | 1116 | tcf_action_destroy(actions, bind); |
d349f997 CW |
1117 | err_mod: |
1118 | for (i = 0; i < TCA_ACT_MAX_PRIO; i++) { | |
1119 | if (ops[i]) | |
1120 | module_put(ops[i]->owner); | |
1121 | } | |
33be6271 | 1122 | return err; |
1da177e4 LT |
1123 | } |
1124 | ||
4b61d3e8 PL |
1125 | void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets, |
1126 | u64 drops, bool hw) | |
c8ecebd0 | 1127 | { |
5e174d5e VB |
1128 | if (a->cpu_bstats) { |
1129 | _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), bytes, packets); | |
c8ecebd0 | 1130 | |
4b61d3e8 | 1131 | this_cpu_ptr(a->cpu_qstats)->drops += drops; |
5e174d5e VB |
1132 | |
1133 | if (hw) | |
1134 | _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats_hw), | |
1135 | bytes, packets); | |
1136 | return; | |
1137 | } | |
c8ecebd0 | 1138 | |
5e174d5e | 1139 | _bstats_update(&a->tcfa_bstats, bytes, packets); |
4b61d3e8 | 1140 | a->tcfa_qstats.drops += drops; |
c8ecebd0 | 1141 | if (hw) |
5e174d5e | 1142 | _bstats_update(&a->tcfa_bstats_hw, bytes, packets); |
c8ecebd0 VB |
1143 | } |
1144 | EXPORT_SYMBOL(tcf_action_update_stats); | |
1145 | ||
ec0595cc | 1146 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p, |
1da177e4 LT |
1147 | int compat_mode) |
1148 | { | |
1149 | int err = 0; | |
1150 | struct gnet_dump d; | |
10297b99 | 1151 | |
7eb8896d | 1152 | if (p == NULL) |
1da177e4 LT |
1153 | goto errout; |
1154 | ||
1155 | /* compat_mode being true specifies a call that is supposed | |
06fe9fb4 | 1156 | * to add additional backward compatibility statistic TLVs. |
1da177e4 LT |
1157 | */ |
1158 | if (compat_mode) { | |
ec0595cc | 1159 | if (p->type == TCA_OLD_COMPAT) |
1da177e4 | 1160 | err = gnet_stats_start_copy_compat(skb, 0, |
9854518e ND |
1161 | TCA_STATS, |
1162 | TCA_XSTATS, | |
ec0595cc | 1163 | &p->tcfa_lock, &d, |
9854518e | 1164 | TCA_PAD); |
1da177e4 LT |
1165 | else |
1166 | return 0; | |
1167 | } else | |
1168 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
ec0595cc | 1169 | &p->tcfa_lock, &d, TCA_ACT_PAD); |
1da177e4 LT |
1170 | |
1171 | if (err < 0) | |
1172 | goto errout; | |
1173 | ||
ec0595cc | 1174 | if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 || |
28169aba EC |
1175 | gnet_stats_copy_basic_hw(NULL, &d, p->cpu_bstats_hw, |
1176 | &p->tcfa_bstats_hw) < 0 || | |
1c0d32fd | 1177 | gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 || |
519c818e | 1178 | gnet_stats_copy_queue(&d, p->cpu_qstats, |
ec0595cc WC |
1179 | &p->tcfa_qstats, |
1180 | p->tcfa_qstats.qlen) < 0) | |
1da177e4 LT |
1181 | goto errout; |
1182 | ||
1183 | if (gnet_stats_finish_copy(&d) < 0) | |
1184 | goto errout; | |
1185 | ||
1186 | return 0; | |
1187 | ||
1188 | errout: | |
1189 | return -1; | |
1190 | } | |
1191 | ||
90b73b77 | 1192 | static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[], |
0b0f43fe JHS |
1193 | u32 portid, u32 seq, u16 flags, int event, int bind, |
1194 | int ref) | |
1da177e4 LT |
1195 | { |
1196 | struct tcamsg *t; | |
1197 | struct nlmsghdr *nlh; | |
27a884dc | 1198 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1199 | struct nlattr *nest; |
1da177e4 | 1200 | |
15e47304 | 1201 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags); |
8b00a53c DM |
1202 | if (!nlh) |
1203 | goto out_nlmsg_trim; | |
1204 | t = nlmsg_data(nlh); | |
1da177e4 | 1205 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1206 | t->tca__pad1 = 0; |
1207 | t->tca__pad2 = 0; | |
10297b99 | 1208 | |
ae0be8de | 1209 | nest = nla_nest_start_noflag(skb, TCA_ACT_TAB); |
1af85155 | 1210 | if (!nest) |
8b00a53c | 1211 | goto out_nlmsg_trim; |
1da177e4 | 1212 | |
ca44b738 | 1213 | if (tcf_action_dump(skb, actions, bind, ref, false) < 0) |
8b00a53c | 1214 | goto out_nlmsg_trim; |
1da177e4 | 1215 | |
4b3550ef | 1216 | nla_nest_end(skb, nest); |
10297b99 | 1217 | |
27a884dc | 1218 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1219 | return skb->len; |
1220 | ||
8b00a53c | 1221 | out_nlmsg_trim: |
dc5fc579 | 1222 | nlmsg_trim(skb, b); |
1da177e4 LT |
1223 | return -1; |
1224 | } | |
1225 | ||
1226 | static int | |
c4c4290c | 1227 | tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n, |
90b73b77 | 1228 | struct tc_action *actions[], int event, |
84ae017a | 1229 | struct netlink_ext_ack *extack) |
1da177e4 LT |
1230 | { |
1231 | struct sk_buff *skb; | |
1da177e4 LT |
1232 | |
1233 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1234 | if (!skb) | |
1235 | return -ENOBUFS; | |
0b0f43fe | 1236 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, |
3f7c72bc | 1237 | 0, 1) <= 0) { |
84ae017a | 1238 | NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action"); |
1da177e4 LT |
1239 | kfree_skb(skb); |
1240 | return -EINVAL; | |
1241 | } | |
2942e900 | 1242 | |
15e47304 | 1243 | return rtnl_unicast(skb, net, portid); |
1da177e4 LT |
1244 | } |
1245 | ||
ddf97ccd | 1246 | static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla, |
84ae017a AA |
1247 | struct nlmsghdr *n, u32 portid, |
1248 | struct netlink_ext_ack *extack) | |
1da177e4 | 1249 | { |
cc7ec456 | 1250 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
a85a970a | 1251 | const struct tc_action_ops *ops; |
1da177e4 LT |
1252 | struct tc_action *a; |
1253 | int index; | |
ab27cfb8 | 1254 | int err; |
1da177e4 | 1255 | |
199ce850 CW |
1256 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, |
1257 | tcf_action_policy, extack); | |
cee63723 | 1258 | if (err < 0) |
ab27cfb8 | 1259 | goto err_out; |
1da177e4 | 1260 | |
cee63723 | 1261 | err = -EINVAL; |
7ba699c6 | 1262 | if (tb[TCA_ACT_INDEX] == NULL || |
84ae017a AA |
1263 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) { |
1264 | NL_SET_ERR_MSG(extack, "Invalid TC action index value"); | |
ab27cfb8 | 1265 | goto err_out; |
84ae017a | 1266 | } |
1587bac4 | 1267 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 1268 | |
ab27cfb8 | 1269 | err = -EINVAL; |
a85a970a | 1270 | ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
84ae017a | 1271 | if (!ops) { /* could happen in batch of actions */ |
f061b48c | 1272 | NL_SET_ERR_MSG(extack, "Specified TC action kind not found"); |
a85a970a | 1273 | goto err_out; |
84ae017a | 1274 | } |
ab27cfb8 | 1275 | err = -ENOENT; |
f061b48c CW |
1276 | if (ops->lookup(net, &a, index) == 0) { |
1277 | NL_SET_ERR_MSG(extack, "TC action with specified index not found"); | |
1da177e4 | 1278 | goto err_mod; |
f061b48c | 1279 | } |
1da177e4 | 1280 | |
a85a970a | 1281 | module_put(ops->owner); |
1da177e4 | 1282 | return a; |
ab27cfb8 | 1283 | |
1da177e4 | 1284 | err_mod: |
a85a970a | 1285 | module_put(ops->owner); |
ab27cfb8 PM |
1286 | err_out: |
1287 | return ERR_PTR(err); | |
1da177e4 LT |
1288 | } |
1289 | ||
7316ae88 | 1290 | static int tca_action_flush(struct net *net, struct nlattr *nla, |
84ae017a AA |
1291 | struct nlmsghdr *n, u32 portid, |
1292 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
1293 | { |
1294 | struct sk_buff *skb; | |
1295 | unsigned char *b; | |
1296 | struct nlmsghdr *nlh; | |
1297 | struct tcamsg *t; | |
1298 | struct netlink_callback dcb; | |
4b3550ef | 1299 | struct nlattr *nest; |
cc7ec456 | 1300 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
a85a970a | 1301 | const struct tc_action_ops *ops; |
7ba699c6 | 1302 | struct nlattr *kind; |
36723873 | 1303 | int err = -ENOMEM; |
1da177e4 | 1304 | |
1da177e4 | 1305 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
84ae017a | 1306 | if (!skb) |
36723873 | 1307 | return err; |
1da177e4 | 1308 | |
27a884dc | 1309 | b = skb_tail_pointer(skb); |
1da177e4 | 1310 | |
199ce850 CW |
1311 | err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, |
1312 | tcf_action_policy, extack); | |
cee63723 | 1313 | if (err < 0) |
1da177e4 LT |
1314 | goto err_out; |
1315 | ||
cee63723 | 1316 | err = -EINVAL; |
7ba699c6 | 1317 | kind = tb[TCA_ACT_KIND]; |
a85a970a | 1318 | ops = tc_lookup_action(kind); |
84ae017a AA |
1319 | if (!ops) { /*some idjot trying to flush unknown action */ |
1320 | NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action"); | |
1da177e4 | 1321 | goto err_out; |
84ae017a | 1322 | } |
1da177e4 | 1323 | |
0b0f43fe JHS |
1324 | nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, |
1325 | sizeof(*t), 0); | |
84ae017a AA |
1326 | if (!nlh) { |
1327 | NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification"); | |
8b00a53c | 1328 | goto out_module_put; |
84ae017a | 1329 | } |
8b00a53c | 1330 | t = nlmsg_data(nlh); |
1da177e4 | 1331 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1332 | t->tca__pad1 = 0; |
1333 | t->tca__pad2 = 0; | |
1da177e4 | 1334 | |
ae0be8de | 1335 | nest = nla_nest_start_noflag(skb, TCA_ACT_TAB); |
84ae017a AA |
1336 | if (!nest) { |
1337 | NL_SET_ERR_MSG(extack, "Failed to add new netlink message"); | |
8b00a53c | 1338 | goto out_module_put; |
84ae017a | 1339 | } |
1da177e4 | 1340 | |
41780105 | 1341 | err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops, extack); |
66dede2d DC |
1342 | if (err <= 0) { |
1343 | nla_nest_cancel(skb, nest); | |
8b00a53c | 1344 | goto out_module_put; |
66dede2d | 1345 | } |
1da177e4 | 1346 | |
4b3550ef | 1347 | nla_nest_end(skb, nest); |
1da177e4 | 1348 | |
27a884dc | 1349 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 | 1350 | nlh->nlmsg_flags |= NLM_F_ROOT; |
a85a970a | 1351 | module_put(ops->owner); |
15e47304 | 1352 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 1353 | n->nlmsg_flags & NLM_F_ECHO); |
84ae017a AA |
1354 | if (err < 0) |
1355 | NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification"); | |
1da177e4 LT |
1356 | |
1357 | return err; | |
1358 | ||
8b00a53c | 1359 | out_module_put: |
a85a970a | 1360 | module_put(ops->owner); |
1da177e4 LT |
1361 | err_out: |
1362 | kfree_skb(skb); | |
1da177e4 LT |
1363 | return err; |
1364 | } | |
1365 | ||
b144e7ec | 1366 | static int tcf_action_delete(struct net *net, struct tc_action *actions[]) |
16af6067 | 1367 | { |
97a3f84f | 1368 | int i; |
16af6067 | 1369 | |
90b73b77 VB |
1370 | for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) { |
1371 | struct tc_action *a = actions[i]; | |
16af6067 | 1372 | const struct tc_action_ops *ops = a->ops; |
16af6067 VB |
1373 | /* Actions can be deleted concurrently so we must save their |
1374 | * type and id to search again after reference is released. | |
1375 | */ | |
97a3f84f CW |
1376 | struct tcf_idrinfo *idrinfo = a->idrinfo; |
1377 | u32 act_index = a->tcfa_index; | |
16af6067 | 1378 | |
c10bbfae | 1379 | actions[i] = NULL; |
16af6067 VB |
1380 | if (tcf_action_put(a)) { |
1381 | /* last reference, action was deleted concurrently */ | |
1382 | module_put(ops->owner); | |
1383 | } else { | |
97a3f84f CW |
1384 | int ret; |
1385 | ||
16af6067 | 1386 | /* now do the delete */ |
97a3f84f | 1387 | ret = tcf_idr_delete_index(idrinfo, act_index); |
edfaf94f | 1388 | if (ret < 0) |
16af6067 VB |
1389 | return ret; |
1390 | } | |
1391 | } | |
1392 | return 0; | |
1393 | } | |
1394 | ||
a56e1953 | 1395 | static int |
90b73b77 | 1396 | tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[], |
edfaf94f | 1397 | u32 portid, size_t attr_size, struct netlink_ext_ack *extack) |
a56e1953 WC |
1398 | { |
1399 | int ret; | |
1400 | struct sk_buff *skb; | |
1401 | ||
d04e6990 RM |
1402 | skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size, |
1403 | GFP_KERNEL); | |
a56e1953 WC |
1404 | if (!skb) |
1405 | return -ENOBUFS; | |
1406 | ||
1407 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION, | |
3f7c72bc | 1408 | 0, 2) <= 0) { |
84ae017a | 1409 | NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes"); |
a56e1953 WC |
1410 | kfree_skb(skb); |
1411 | return -EINVAL; | |
1412 | } | |
1413 | ||
1414 | /* now do the delete */ | |
b144e7ec | 1415 | ret = tcf_action_delete(net, actions); |
55334a5d | 1416 | if (ret < 0) { |
84ae017a | 1417 | NL_SET_ERR_MSG(extack, "Failed to delete TC action"); |
55334a5d WC |
1418 | kfree_skb(skb); |
1419 | return ret; | |
1420 | } | |
a56e1953 WC |
1421 | |
1422 | ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
1423 | n->nlmsg_flags & NLM_F_ECHO); | |
a56e1953 WC |
1424 | return ret; |
1425 | } | |
1426 | ||
1da177e4 | 1427 | static int |
7316ae88 | 1428 | tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
84ae017a | 1429 | u32 portid, int event, struct netlink_ext_ack *extack) |
1da177e4 | 1430 | { |
cee63723 | 1431 | int i, ret; |
cc7ec456 | 1432 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 | 1433 | struct tc_action *act; |
d04e6990 | 1434 | size_t attr_size = 0; |
edfaf94f | 1435 | struct tc_action *actions[TCA_ACT_MAX_PRIO] = {}; |
1da177e4 | 1436 | |
8cb08174 JB |
1437 | ret = nla_parse_nested_deprecated(tb, TCA_ACT_MAX_PRIO, nla, NULL, |
1438 | extack); | |
cee63723 PM |
1439 | if (ret < 0) |
1440 | return ret; | |
1da177e4 | 1441 | |
cc7ec456 | 1442 | if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) { |
1af85155 | 1443 | if (tb[1]) |
84ae017a | 1444 | return tca_action_flush(net, tb[1], n, portid, extack); |
1af85155 | 1445 | |
84ae017a | 1446 | NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action"); |
1af85155 | 1447 | return -EINVAL; |
1da177e4 LT |
1448 | } |
1449 | ||
7ba699c6 | 1450 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
84ae017a | 1451 | act = tcf_action_get_1(net, tb[i], n, portid, extack); |
ab27cfb8 PM |
1452 | if (IS_ERR(act)) { |
1453 | ret = PTR_ERR(act); | |
1da177e4 | 1454 | goto err; |
ab27cfb8 | 1455 | } |
4e76e75d | 1456 | attr_size += tcf_action_fill_size(act); |
90b73b77 | 1457 | actions[i - 1] = act; |
1da177e4 | 1458 | } |
4e76e75d RM |
1459 | |
1460 | attr_size = tcf_action_full_attrs_size(attr_size); | |
1da177e4 LT |
1461 | |
1462 | if (event == RTM_GETACTION) | |
90b73b77 | 1463 | ret = tcf_get_notify(net, portid, n, actions, event, extack); |
1da177e4 | 1464 | else { /* delete */ |
edfaf94f | 1465 | ret = tcf_del_notify(net, n, actions, portid, attr_size, extack); |
a56e1953 | 1466 | if (ret) |
1da177e4 | 1467 | goto err; |
edfaf94f | 1468 | return 0; |
1da177e4 LT |
1469 | } |
1470 | err: | |
edfaf94f | 1471 | tcf_action_put_many(actions); |
1da177e4 LT |
1472 | return ret; |
1473 | } | |
1474 | ||
a56e1953 | 1475 | static int |
90b73b77 | 1476 | tcf_add_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[], |
d04e6990 | 1477 | u32 portid, size_t attr_size, struct netlink_ext_ack *extack) |
1da177e4 | 1478 | { |
1da177e4 | 1479 | struct sk_buff *skb; |
1da177e4 | 1480 | |
d04e6990 RM |
1481 | skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size, |
1482 | GFP_KERNEL); | |
1da177e4 LT |
1483 | if (!skb) |
1484 | return -ENOBUFS; | |
1485 | ||
a56e1953 WC |
1486 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags, |
1487 | RTM_NEWACTION, 0, 0) <= 0) { | |
d143b9e3 | 1488 | NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action"); |
a56e1953 WC |
1489 | kfree_skb(skb); |
1490 | return -EINVAL; | |
1491 | } | |
10297b99 | 1492 | |
f79a3bcb YD |
1493 | return rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
1494 | n->nlmsg_flags & NLM_F_ECHO); | |
1da177e4 LT |
1495 | } |
1496 | ||
5a7a5555 | 1497 | static int tcf_action_add(struct net *net, struct nlattr *nla, |
aea0d727 AA |
1498 | struct nlmsghdr *n, u32 portid, int ovr, |
1499 | struct netlink_ext_ack *extack) | |
1da177e4 | 1500 | { |
d04e6990 | 1501 | size_t attr_size = 0; |
87c750e8 | 1502 | int loop, ret, i; |
90b73b77 | 1503 | struct tc_action *actions[TCA_ACT_MAX_PRIO] = {}; |
87c750e8 | 1504 | int init_res[TCA_ACT_MAX_PRIO] = {}; |
1da177e4 | 1505 | |
39f13ea2 ED |
1506 | for (loop = 0; loop < 10; loop++) { |
1507 | ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0, | |
87c750e8 | 1508 | actions, init_res, &attr_size, true, extack); |
39f13ea2 ED |
1509 | if (ret != -EAGAIN) |
1510 | break; | |
1511 | } | |
1512 | ||
90b73b77 | 1513 | if (ret < 0) |
f07fed82 | 1514 | return ret; |
90b73b77 | 1515 | ret = tcf_add_notify(net, n, actions, portid, attr_size, extack); |
87c750e8 VB |
1516 | |
1517 | /* only put existing actions */ | |
1518 | for (i = 0; i < TCA_ACT_MAX_PRIO; i++) | |
1519 | if (init_res[i] == ACT_P_CREATED) | |
1520 | actions[i] = NULL; | |
1521 | tcf_action_put_many(actions); | |
1da177e4 | 1522 | |
cae422f3 | 1523 | return ret; |
1da177e4 LT |
1524 | } |
1525 | ||
90825b23 | 1526 | static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = { |
f460019b VB |
1527 | [TCA_ROOT_FLAGS] = NLA_POLICY_BITFIELD32(TCA_ACT_FLAG_LARGE_DUMP_ON | |
1528 | TCA_ACT_FLAG_TERSE_DUMP), | |
e62e484d | 1529 | [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 }, |
90825b23 JHS |
1530 | }; |
1531 | ||
c21ef3e3 DA |
1532 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, |
1533 | struct netlink_ext_ack *extack) | |
1da177e4 | 1534 | { |
3b1e0a65 | 1535 | struct net *net = sock_net(skb->sk); |
90825b23 | 1536 | struct nlattr *tca[TCA_ROOT_MAX + 1]; |
8bf15395 | 1537 | u32 portid = NETLINK_CB(skb).portid; |
1da177e4 LT |
1538 | int ret = 0, ovr = 0; |
1539 | ||
0b0f43fe JHS |
1540 | if ((n->nlmsg_type != RTM_GETACTION) && |
1541 | !netlink_capable(skb, CAP_NET_ADMIN)) | |
dfc47ef8 EB |
1542 | return -EPERM; |
1543 | ||
8cb08174 JB |
1544 | ret = nlmsg_parse_deprecated(n, sizeof(struct tcamsg), tca, |
1545 | TCA_ROOT_MAX, NULL, extack); | |
7ba699c6 PM |
1546 | if (ret < 0) |
1547 | return ret; | |
1548 | ||
1549 | if (tca[TCA_ACT_TAB] == NULL) { | |
84ae017a | 1550 | NL_SET_ERR_MSG(extack, "Netlink action attributes missing"); |
1da177e4 LT |
1551 | return -EINVAL; |
1552 | } | |
1553 | ||
cc7ec456 | 1554 | /* n->nlmsg_flags & NLM_F_CREATE */ |
1da177e4 LT |
1555 | switch (n->nlmsg_type) { |
1556 | case RTM_NEWACTION: | |
1557 | /* we are going to assume all other flags | |
25985edc | 1558 | * imply create only if it doesn't exist |
1da177e4 LT |
1559 | * Note that CREATE | EXCL implies that |
1560 | * but since we want avoid ambiguity (eg when flags | |
1561 | * is zero) then just set this | |
1562 | */ | |
cc7ec456 | 1563 | if (n->nlmsg_flags & NLM_F_REPLACE) |
1da177e4 | 1564 | ovr = 1; |
aea0d727 AA |
1565 | ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr, |
1566 | extack); | |
1da177e4 LT |
1567 | break; |
1568 | case RTM_DELACTION: | |
7316ae88 | 1569 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
84ae017a | 1570 | portid, RTM_DELACTION, extack); |
1da177e4 LT |
1571 | break; |
1572 | case RTM_GETACTION: | |
7316ae88 | 1573 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
84ae017a | 1574 | portid, RTM_GETACTION, extack); |
1da177e4 LT |
1575 | break; |
1576 | default: | |
1577 | BUG(); | |
1578 | } | |
1579 | ||
1580 | return ret; | |
1581 | } | |
1582 | ||
90825b23 | 1583 | static struct nlattr *find_dump_kind(struct nlattr **nla) |
1da177e4 | 1584 | { |
cc7ec456 | 1585 | struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1]; |
7ba699c6 | 1586 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
7ba699c6 | 1587 | struct nlattr *kind; |
1da177e4 | 1588 | |
7ba699c6 | 1589 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
1590 | if (tb1 == NULL) |
1591 | return NULL; | |
1592 | ||
8cb08174 | 1593 | if (nla_parse_deprecated(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0) |
1da177e4 | 1594 | return NULL; |
1da177e4 | 1595 | |
6d834e04 PM |
1596 | if (tb[1] == NULL) |
1597 | return NULL; | |
199ce850 | 1598 | if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0) |
1da177e4 | 1599 | return NULL; |
7ba699c6 | 1600 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 1601 | |
26dab893 | 1602 | return kind; |
1da177e4 LT |
1603 | } |
1604 | ||
5a7a5555 | 1605 | static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 1606 | { |
ddf97ccd | 1607 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1608 | struct nlmsghdr *nlh; |
27a884dc | 1609 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1610 | struct nlattr *nest; |
1da177e4 | 1611 | struct tc_action_ops *a_o; |
1da177e4 | 1612 | int ret = 0; |
8b00a53c | 1613 | struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh); |
90825b23 JHS |
1614 | struct nlattr *tb[TCA_ROOT_MAX + 1]; |
1615 | struct nlattr *count_attr = NULL; | |
e62e484d | 1616 | unsigned long jiffy_since = 0; |
90825b23 JHS |
1617 | struct nlattr *kind = NULL; |
1618 | struct nla_bitfield32 bf; | |
e62e484d | 1619 | u32 msecs_since = 0; |
90825b23 JHS |
1620 | u32 act_count = 0; |
1621 | ||
8cb08174 JB |
1622 | ret = nlmsg_parse_deprecated(cb->nlh, sizeof(struct tcamsg), tb, |
1623 | TCA_ROOT_MAX, tcaa_policy, cb->extack); | |
90825b23 JHS |
1624 | if (ret < 0) |
1625 | return ret; | |
1da177e4 | 1626 | |
90825b23 | 1627 | kind = find_dump_kind(tb); |
1da177e4 | 1628 | if (kind == NULL) { |
6ff9c364 | 1629 | pr_info("tc_dump_action: action bad kind\n"); |
1da177e4 LT |
1630 | return 0; |
1631 | } | |
1632 | ||
26dab893 | 1633 | a_o = tc_lookup_action(kind); |
cc7ec456 | 1634 | if (a_o == NULL) |
1da177e4 | 1635 | return 0; |
1da177e4 | 1636 | |
90825b23 JHS |
1637 | cb->args[2] = 0; |
1638 | if (tb[TCA_ROOT_FLAGS]) { | |
1639 | bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]); | |
1640 | cb->args[2] = bf.value; | |
1641 | } | |
1642 | ||
e62e484d JHS |
1643 | if (tb[TCA_ROOT_TIME_DELTA]) { |
1644 | msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]); | |
1645 | } | |
1646 | ||
15e47304 | 1647 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
8b00a53c DM |
1648 | cb->nlh->nlmsg_type, sizeof(*t), 0); |
1649 | if (!nlh) | |
1650 | goto out_module_put; | |
90825b23 | 1651 | |
e62e484d JHS |
1652 | if (msecs_since) |
1653 | jiffy_since = jiffies - msecs_to_jiffies(msecs_since); | |
1654 | ||
8b00a53c | 1655 | t = nlmsg_data(nlh); |
1da177e4 | 1656 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1657 | t->tca__pad1 = 0; |
1658 | t->tca__pad2 = 0; | |
e62e484d | 1659 | cb->args[3] = jiffy_since; |
90825b23 JHS |
1660 | count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32)); |
1661 | if (!count_attr) | |
1662 | goto out_module_put; | |
1da177e4 | 1663 | |
ae0be8de | 1664 | nest = nla_nest_start_noflag(skb, TCA_ACT_TAB); |
4b3550ef | 1665 | if (nest == NULL) |
8b00a53c | 1666 | goto out_module_put; |
1da177e4 | 1667 | |
41780105 | 1668 | ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o, NULL); |
1da177e4 | 1669 | if (ret < 0) |
8b00a53c | 1670 | goto out_module_put; |
1da177e4 LT |
1671 | |
1672 | if (ret > 0) { | |
4b3550ef | 1673 | nla_nest_end(skb, nest); |
1da177e4 | 1674 | ret = skb->len; |
90825b23 JHS |
1675 | act_count = cb->args[1]; |
1676 | memcpy(nla_data(count_attr), &act_count, sizeof(u32)); | |
1677 | cb->args[1] = 0; | |
1da177e4 | 1678 | } else |
ebecaa66 | 1679 | nlmsg_trim(skb, b); |
1da177e4 | 1680 | |
27a884dc | 1681 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
15e47304 | 1682 | if (NETLINK_CB(cb->skb).portid && ret) |
1da177e4 LT |
1683 | nlh->nlmsg_flags |= NLM_F_MULTI; |
1684 | module_put(a_o->owner); | |
1685 | return skb->len; | |
1686 | ||
8b00a53c | 1687 | out_module_put: |
1da177e4 | 1688 | module_put(a_o->owner); |
dc5fc579 | 1689 | nlmsg_trim(skb, b); |
1da177e4 LT |
1690 | return skb->len; |
1691 | } | |
1692 | ||
1693 | static int __init tc_action_init(void) | |
1694 | { | |
b97bac64 FW |
1695 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0); |
1696 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0); | |
c7ac8679 | 1697 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, |
b97bac64 | 1698 | 0); |
1da177e4 | 1699 | |
1da177e4 LT |
1700 | return 0; |
1701 | } | |
1702 | ||
1703 | subsys_initcall(tc_action_init); |