Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * net/sched/act_api.c Packet action API. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Author: Jamal Hadi Salim | |
10 | * | |
11 | * | |
12 | */ | |
13 | ||
1da177e4 LT |
14 | #include <linux/types.h> |
15 | #include <linux/kernel.h> | |
1da177e4 | 16 | #include <linux/string.h> |
1da177e4 | 17 | #include <linux/errno.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
1da177e4 | 19 | #include <linux/skbuff.h> |
1da177e4 LT |
20 | #include <linux/init.h> |
21 | #include <linux/kmod.h> | |
ab27cfb8 | 22 | #include <linux/err.h> |
3a9a231d | 23 | #include <linux/module.h> |
b3f55bdd JP |
24 | #include <linux/rhashtable.h> |
25 | #include <linux/list.h> | |
b854272b DL |
26 | #include <net/net_namespace.h> |
27 | #include <net/sock.h> | |
1da177e4 | 28 | #include <net/sch_generic.h> |
1045ba77 | 29 | #include <net/pkt_cls.h> |
1da177e4 | 30 | #include <net/act_api.h> |
dc5fc579 | 31 | #include <net/netlink.h> |
1da177e4 | 32 | |
db50514f JP |
33 | static int tcf_action_goto_chain_init(struct tc_action *a, struct tcf_proto *tp) |
34 | { | |
35 | u32 chain_index = a->tcfa_action & TC_ACT_EXT_VAL_MASK; | |
36 | ||
37 | if (!tp) | |
38 | return -EINVAL; | |
1f3ed383 | 39 | a->goto_chain = tcf_chain_get_by_act(tp->chain->block, chain_index); |
db50514f JP |
40 | if (!a->goto_chain) |
41 | return -ENOMEM; | |
42 | return 0; | |
43 | } | |
44 | ||
45 | static void tcf_action_goto_chain_fini(struct tc_action *a) | |
46 | { | |
1f3ed383 | 47 | tcf_chain_put_by_act(a->goto_chain); |
db50514f JP |
48 | } |
49 | ||
50 | static void tcf_action_goto_chain_exec(const struct tc_action *a, | |
51 | struct tcf_result *res) | |
52 | { | |
53 | const struct tcf_chain *chain = a->goto_chain; | |
54 | ||
55 | res->goto_tp = rcu_dereference_bh(chain->filter_chain); | |
56 | } | |
57 | ||
eec94fdb VB |
58 | static void tcf_free_cookie_rcu(struct rcu_head *p) |
59 | { | |
60 | struct tc_cookie *cookie = container_of(p, struct tc_cookie, rcu); | |
61 | ||
62 | kfree(cookie->data); | |
63 | kfree(cookie); | |
64 | } | |
65 | ||
66 | static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie, | |
67 | struct tc_cookie *new_cookie) | |
68 | { | |
69 | struct tc_cookie *old; | |
70 | ||
0dbc81ea | 71 | old = xchg((__force struct tc_cookie **)old_cookie, new_cookie); |
eec94fdb VB |
72 | if (old) |
73 | call_rcu(&old->rcu, tcf_free_cookie_rcu); | |
74 | } | |
75 | ||
d7fb60b9 CW |
76 | /* XXX: For standalone actions, we don't need a RCU grace period either, because |
77 | * actions are always connected to filters and filters are already destroyed in | |
78 | * RCU callbacks, so after a RCU grace period actions are already disconnected | |
79 | * from filters. Readers later can not find us. | |
80 | */ | |
81 | static void free_tcf(struct tc_action *p) | |
519c818e | 82 | { |
519c818e | 83 | free_percpu(p->cpu_bstats); |
28169aba | 84 | free_percpu(p->cpu_bstats_hw); |
519c818e | 85 | free_percpu(p->cpu_qstats); |
1045ba77 | 86 | |
eec94fdb | 87 | tcf_set_action_cookie(&p->act_cookie, NULL); |
db50514f JP |
88 | if (p->goto_chain) |
89 | tcf_action_goto_chain_fini(p); | |
1045ba77 | 90 | |
519c818e ED |
91 | kfree(p); |
92 | } | |
93 | ||
16af6067 | 94 | static void tcf_action_cleanup(struct tc_action *p) |
e9ce1cd3 | 95 | { |
16af6067 VB |
96 | if (p->ops->cleanup) |
97 | p->ops->cleanup(p); | |
98 | ||
1c0d32fd | 99 | gen_kill_estimator(&p->tcfa_rate_est); |
d7fb60b9 | 100 | free_tcf(p); |
e9ce1cd3 | 101 | } |
e9ce1cd3 | 102 | |
16af6067 VB |
103 | static int __tcf_action_put(struct tc_action *p, bool bind) |
104 | { | |
105 | struct tcf_idrinfo *idrinfo = p->idrinfo; | |
106 | ||
107 | if (refcount_dec_and_lock(&p->tcfa_refcnt, &idrinfo->lock)) { | |
108 | if (bind) | |
109 | atomic_dec(&p->tcfa_bindcnt); | |
110 | idr_remove(&idrinfo->action_idr, p->tcfa_index); | |
111 | spin_unlock(&idrinfo->lock); | |
112 | ||
113 | tcf_action_cleanup(p); | |
114 | return 1; | |
115 | } | |
116 | ||
117 | if (bind) | |
118 | atomic_dec(&p->tcfa_bindcnt); | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
65a206c0 | 123 | int __tcf_idr_release(struct tc_action *p, bool bind, bool strict) |
e9ce1cd3 DM |
124 | { |
125 | int ret = 0; | |
126 | ||
036bb443 VB |
127 | /* Release with strict==1 and bind==0 is only called through act API |
128 | * interface (classifiers always bind). Only case when action with | |
129 | * positive reference count and zero bind count can exist is when it was | |
130 | * also created with act API (unbinding last classifier will destroy the | |
131 | * action if it was created by classifier). So only case when bind count | |
132 | * can be changed after initial check is when unbound action is | |
133 | * destroyed by act API while classifier binds to action with same id | |
134 | * concurrently. This result either creation of new action(same behavior | |
135 | * as before), or reusing existing action if concurrent process | |
136 | * increments reference count before action is deleted. Both scenarios | |
137 | * are acceptable. | |
138 | */ | |
e9ce1cd3 | 139 | if (p) { |
16af6067 | 140 | if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0) |
55334a5d | 141 | return -EPERM; |
e9ce1cd3 | 142 | |
16af6067 | 143 | if (__tcf_action_put(p, bind)) |
1d4150c0 | 144 | ret = ACT_P_DELETED; |
e9ce1cd3 | 145 | } |
28e6b67f | 146 | |
e9ce1cd3 DM |
147 | return ret; |
148 | } | |
65a206c0 | 149 | EXPORT_SYMBOL(__tcf_idr_release); |
e9ce1cd3 | 150 | |
4e76e75d RM |
151 | static size_t tcf_action_shared_attrs_size(const struct tc_action *act) |
152 | { | |
e0479b67 | 153 | struct tc_cookie *act_cookie; |
4e76e75d RM |
154 | u32 cookie_len = 0; |
155 | ||
e0479b67 VB |
156 | rcu_read_lock(); |
157 | act_cookie = rcu_dereference(act->act_cookie); | |
158 | ||
159 | if (act_cookie) | |
160 | cookie_len = nla_total_size(act_cookie->len); | |
161 | rcu_read_unlock(); | |
4e76e75d RM |
162 | |
163 | return nla_total_size(0) /* action number nested */ | |
164 | + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */ | |
165 | + cookie_len /* TCA_ACT_COOKIE */ | |
166 | + nla_total_size(0) /* TCA_ACT_STATS nested */ | |
167 | /* TCA_STATS_BASIC */ | |
168 | + nla_total_size_64bit(sizeof(struct gnet_stats_basic)) | |
169 | /* TCA_STATS_QUEUE */ | |
170 | + nla_total_size_64bit(sizeof(struct gnet_stats_queue)) | |
171 | + nla_total_size(0) /* TCA_OPTIONS nested */ | |
172 | + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */ | |
173 | } | |
174 | ||
175 | static size_t tcf_action_full_attrs_size(size_t sz) | |
176 | { | |
177 | return NLMSG_HDRLEN /* struct nlmsghdr */ | |
178 | + sizeof(struct tcamsg) | |
179 | + nla_total_size(0) /* TCA_ACT_TAB nested */ | |
180 | + sz; | |
181 | } | |
182 | ||
183 | static size_t tcf_action_fill_size(const struct tc_action *act) | |
184 | { | |
185 | size_t sz = tcf_action_shared_attrs_size(act); | |
186 | ||
187 | if (act->ops->get_fill_size) | |
188 | return act->ops->get_fill_size(act) + sz; | |
189 | return sz; | |
190 | } | |
191 | ||
65a206c0 | 192 | static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb, |
a85a970a | 193 | struct netlink_callback *cb) |
e9ce1cd3 | 194 | { |
65a206c0 | 195 | int err = 0, index = -1, s_i = 0, n_i = 0; |
90825b23 | 196 | u32 act_flags = cb->args[2]; |
e62e484d | 197 | unsigned long jiffy_since = cb->args[3]; |
4b3550ef | 198 | struct nlattr *nest; |
65a206c0 CM |
199 | struct idr *idr = &idrinfo->action_idr; |
200 | struct tc_action *p; | |
201 | unsigned long id = 1; | |
e9ce1cd3 | 202 | |
290aa0ad | 203 | spin_lock(&idrinfo->lock); |
e9ce1cd3 DM |
204 | |
205 | s_i = cb->args[0]; | |
206 | ||
7a457577 | 207 | idr_for_each_entry_ul(idr, p, id) { |
65a206c0 CM |
208 | index++; |
209 | if (index < s_i) | |
210 | continue; | |
211 | ||
212 | if (jiffy_since && | |
213 | time_after(jiffy_since, | |
214 | (unsigned long)p->tcfa_tm.lastuse)) | |
215 | continue; | |
216 | ||
217 | nest = nla_nest_start(skb, n_i); | |
734549eb CD |
218 | if (!nest) { |
219 | index--; | |
65a206c0 | 220 | goto nla_put_failure; |
734549eb | 221 | } |
65a206c0 CM |
222 | err = tcf_action_dump_1(skb, p, 0, 0); |
223 | if (err < 0) { | |
224 | index--; | |
225 | nlmsg_trim(skb, nest); | |
226 | goto done; | |
e9ce1cd3 | 227 | } |
65a206c0 CM |
228 | nla_nest_end(skb, nest); |
229 | n_i++; | |
230 | if (!(act_flags & TCA_FLAG_LARGE_DUMP_ON) && | |
231 | n_i >= TCA_ACT_MAX_PRIO) | |
232 | goto done; | |
e9ce1cd3 DM |
233 | } |
234 | done: | |
e62e484d JHS |
235 | if (index >= 0) |
236 | cb->args[0] = index + 1; | |
237 | ||
290aa0ad | 238 | spin_unlock(&idrinfo->lock); |
90825b23 | 239 | if (n_i) { |
90825b23 JHS |
240 | if (act_flags & TCA_FLAG_LARGE_DUMP_ON) |
241 | cb->args[1] = n_i; | |
242 | } | |
e9ce1cd3 DM |
243 | return n_i; |
244 | ||
7ba699c6 | 245 | nla_put_failure: |
4b3550ef | 246 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
247 | goto done; |
248 | } | |
249 | ||
ec3ed293 VB |
250 | static int tcf_idr_release_unsafe(struct tc_action *p) |
251 | { | |
252 | if (atomic_read(&p->tcfa_bindcnt) > 0) | |
253 | return -EPERM; | |
254 | ||
255 | if (refcount_dec_and_test(&p->tcfa_refcnt)) { | |
256 | idr_remove(&p->idrinfo->action_idr, p->tcfa_index); | |
257 | tcf_action_cleanup(p); | |
258 | return ACT_P_DELETED; | |
259 | } | |
260 | ||
261 | return 0; | |
262 | } | |
263 | ||
65a206c0 | 264 | static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb, |
a85a970a | 265 | const struct tc_action_ops *ops) |
e9ce1cd3 | 266 | { |
4b3550ef | 267 | struct nlattr *nest; |
65a206c0 | 268 | int n_i = 0; |
55334a5d | 269 | int ret = -EINVAL; |
65a206c0 CM |
270 | struct idr *idr = &idrinfo->action_idr; |
271 | struct tc_action *p; | |
272 | unsigned long id = 1; | |
e9ce1cd3 | 273 | |
a85a970a | 274 | nest = nla_nest_start(skb, 0); |
4b3550ef PM |
275 | if (nest == NULL) |
276 | goto nla_put_failure; | |
a85a970a | 277 | if (nla_put_string(skb, TCA_KIND, ops->kind)) |
1b34ec43 | 278 | goto nla_put_failure; |
65a206c0 | 279 | |
ec3ed293 | 280 | spin_lock(&idrinfo->lock); |
7a457577 | 281 | idr_for_each_entry_ul(idr, p, id) { |
ec3ed293 | 282 | ret = tcf_idr_release_unsafe(p); |
65a206c0 | 283 | if (ret == ACT_P_DELETED) { |
255cd50f | 284 | module_put(ops->owner); |
65a206c0 CM |
285 | n_i++; |
286 | } else if (ret < 0) { | |
ec3ed293 | 287 | spin_unlock(&idrinfo->lock); |
65a206c0 | 288 | goto nla_put_failure; |
e9ce1cd3 DM |
289 | } |
290 | } | |
ec3ed293 VB |
291 | spin_unlock(&idrinfo->lock); |
292 | ||
1b34ec43 DM |
293 | if (nla_put_u32(skb, TCA_FCNT, n_i)) |
294 | goto nla_put_failure; | |
4b3550ef | 295 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
296 | |
297 | return n_i; | |
7ba699c6 | 298 | nla_put_failure: |
4b3550ef | 299 | nla_nest_cancel(skb, nest); |
55334a5d | 300 | return ret; |
e9ce1cd3 DM |
301 | } |
302 | ||
ddf97ccd WC |
303 | int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, |
304 | struct netlink_callback *cb, int type, | |
b3620145 AA |
305 | const struct tc_action_ops *ops, |
306 | struct netlink_ext_ack *extack) | |
e9ce1cd3 | 307 | { |
65a206c0 | 308 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
ddf97ccd | 309 | |
e9ce1cd3 | 310 | if (type == RTM_DELACTION) { |
65a206c0 | 311 | return tcf_del_walker(idrinfo, skb, ops); |
e9ce1cd3 | 312 | } else if (type == RTM_GETACTION) { |
65a206c0 | 313 | return tcf_dump_walker(idrinfo, skb, cb); |
e9ce1cd3 | 314 | } else { |
b3620145 AA |
315 | WARN(1, "tcf_generic_walker: unknown command %d\n", type); |
316 | NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command"); | |
e9ce1cd3 DM |
317 | return -EINVAL; |
318 | } | |
319 | } | |
ddf97ccd | 320 | EXPORT_SYMBOL(tcf_generic_walker); |
e9ce1cd3 | 321 | |
7d485c45 | 322 | int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index) |
e9ce1cd3 | 323 | { |
3f7c72bc VB |
324 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
325 | struct tc_action *p; | |
e9ce1cd3 | 326 | |
290aa0ad | 327 | spin_lock(&idrinfo->lock); |
322d884b | 328 | p = idr_find(&idrinfo->action_idr, index); |
7d485c45 | 329 | if (IS_ERR(p)) |
0190c1d4 | 330 | p = NULL; |
7d485c45 | 331 | else if (p) |
3f7c72bc | 332 | refcount_inc(&p->tcfa_refcnt); |
290aa0ad | 333 | spin_unlock(&idrinfo->lock); |
e9ce1cd3 | 334 | |
3f7c72bc VB |
335 | if (p) { |
336 | *a = p; | |
337 | return true; | |
338 | } | |
339 | return false; | |
e9ce1cd3 | 340 | } |
65a206c0 | 341 | EXPORT_SYMBOL(tcf_idr_search); |
e9ce1cd3 | 342 | |
97a3f84f | 343 | static int tcf_idr_delete_index(struct tcf_idrinfo *idrinfo, u32 index) |
2a2ea349 | 344 | { |
2a2ea349 VB |
345 | struct tc_action *p; |
346 | int ret = 0; | |
347 | ||
348 | spin_lock(&idrinfo->lock); | |
349 | p = idr_find(&idrinfo->action_idr, index); | |
350 | if (!p) { | |
351 | spin_unlock(&idrinfo->lock); | |
352 | return -ENOENT; | |
353 | } | |
354 | ||
355 | if (!atomic_read(&p->tcfa_bindcnt)) { | |
356 | if (refcount_dec_and_test(&p->tcfa_refcnt)) { | |
357 | struct module *owner = p->ops->owner; | |
358 | ||
359 | WARN_ON(p != idr_remove(&idrinfo->action_idr, | |
360 | p->tcfa_index)); | |
361 | spin_unlock(&idrinfo->lock); | |
362 | ||
16af6067 | 363 | tcf_action_cleanup(p); |
2a2ea349 VB |
364 | module_put(owner); |
365 | return 0; | |
366 | } | |
367 | ret = 0; | |
368 | } else { | |
369 | ret = -EPERM; | |
370 | } | |
371 | ||
372 | spin_unlock(&idrinfo->lock); | |
373 | return ret; | |
374 | } | |
2a2ea349 | 375 | |
65a206c0 CM |
376 | int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est, |
377 | struct tc_action **a, const struct tc_action_ops *ops, | |
378 | int bind, bool cpustats) | |
e9ce1cd3 | 379 | { |
ec0595cc | 380 | struct tc_action *p = kzalloc(ops->size, GFP_KERNEL); |
65a206c0 | 381 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
519c818e | 382 | int err = -ENOMEM; |
e9ce1cd3 DM |
383 | |
384 | if (unlikely(!p)) | |
86062033 | 385 | return -ENOMEM; |
036bb443 | 386 | refcount_set(&p->tcfa_refcnt, 1); |
e9ce1cd3 | 387 | if (bind) |
036bb443 | 388 | atomic_set(&p->tcfa_bindcnt, 1); |
e9ce1cd3 | 389 | |
519c818e ED |
390 | if (cpustats) { |
391 | p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); | |
339913a8 | 392 | if (!p->cpu_bstats) |
519c818e | 393 | goto err1; |
28169aba EC |
394 | p->cpu_bstats_hw = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); |
395 | if (!p->cpu_bstats_hw) | |
396 | goto err2; | |
339913a8 MW |
397 | p->cpu_qstats = alloc_percpu(struct gnet_stats_queue); |
398 | if (!p->cpu_qstats) | |
28169aba | 399 | goto err3; |
519c818e | 400 | } |
ec0595cc | 401 | spin_lock_init(&p->tcfa_lock); |
339913a8 | 402 | p->tcfa_index = index; |
ec0595cc WC |
403 | p->tcfa_tm.install = jiffies; |
404 | p->tcfa_tm.lastuse = jiffies; | |
405 | p->tcfa_tm.firstuse = 0; | |
0e991ec6 | 406 | if (est) { |
ec0595cc WC |
407 | err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats, |
408 | &p->tcfa_rate_est, | |
409 | &p->tcfa_lock, NULL, est); | |
339913a8 | 410 | if (err) |
28169aba | 411 | goto err4; |
0e991ec6 SH |
412 | } |
413 | ||
65a206c0 | 414 | p->idrinfo = idrinfo; |
ec0595cc | 415 | p->ops = ops; |
ec0595cc | 416 | *a = p; |
86062033 | 417 | return 0; |
28169aba | 418 | err4: |
339913a8 | 419 | free_percpu(p->cpu_qstats); |
28169aba EC |
420 | err3: |
421 | free_percpu(p->cpu_bstats_hw); | |
339913a8 MW |
422 | err2: |
423 | free_percpu(p->cpu_bstats); | |
424 | err1: | |
425 | kfree(p); | |
426 | return err; | |
e9ce1cd3 | 427 | } |
65a206c0 | 428 | EXPORT_SYMBOL(tcf_idr_create); |
e9ce1cd3 | 429 | |
65a206c0 | 430 | void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a) |
e9ce1cd3 | 431 | { |
65a206c0 | 432 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
e9ce1cd3 | 433 | |
290aa0ad | 434 | spin_lock(&idrinfo->lock); |
0190c1d4 VB |
435 | /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */ |
436 | WARN_ON(!IS_ERR(idr_replace(&idrinfo->action_idr, a, a->tcfa_index))); | |
290aa0ad | 437 | spin_unlock(&idrinfo->lock); |
e9ce1cd3 | 438 | } |
65a206c0 | 439 | EXPORT_SYMBOL(tcf_idr_insert); |
1da177e4 | 440 | |
0190c1d4 VB |
441 | /* Cleanup idr index that was allocated but not initialized. */ |
442 | ||
443 | void tcf_idr_cleanup(struct tc_action_net *tn, u32 index) | |
444 | { | |
445 | struct tcf_idrinfo *idrinfo = tn->idrinfo; | |
446 | ||
447 | spin_lock(&idrinfo->lock); | |
448 | /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */ | |
449 | WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index))); | |
450 | spin_unlock(&idrinfo->lock); | |
451 | } | |
452 | EXPORT_SYMBOL(tcf_idr_cleanup); | |
453 | ||
454 | /* Check if action with specified index exists. If actions is found, increments | |
455 | * its reference and bind counters, and return 1. Otherwise insert temporary | |
456 | * error pointer (to prevent concurrent users from inserting actions with same | |
457 | * index) and return 0. | |
458 | */ | |
459 | ||
460 | int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, | |
461 | struct tc_action **a, int bind) | |
462 | { | |
463 | struct tcf_idrinfo *idrinfo = tn->idrinfo; | |
464 | struct tc_action *p; | |
465 | int ret; | |
466 | ||
467 | again: | |
468 | spin_lock(&idrinfo->lock); | |
469 | if (*index) { | |
470 | p = idr_find(&idrinfo->action_idr, *index); | |
471 | if (IS_ERR(p)) { | |
472 | /* This means that another process allocated | |
473 | * index but did not assign the pointer yet. | |
474 | */ | |
475 | spin_unlock(&idrinfo->lock); | |
476 | goto again; | |
477 | } | |
478 | ||
479 | if (p) { | |
480 | refcount_inc(&p->tcfa_refcnt); | |
481 | if (bind) | |
482 | atomic_inc(&p->tcfa_bindcnt); | |
483 | *a = p; | |
484 | ret = 1; | |
485 | } else { | |
486 | *a = NULL; | |
487 | ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index, | |
488 | *index, GFP_ATOMIC); | |
489 | if (!ret) | |
490 | idr_replace(&idrinfo->action_idr, | |
491 | ERR_PTR(-EBUSY), *index); | |
492 | } | |
493 | } else { | |
494 | *index = 1; | |
495 | *a = NULL; | |
496 | ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index, | |
497 | UINT_MAX, GFP_ATOMIC); | |
498 | if (!ret) | |
499 | idr_replace(&idrinfo->action_idr, ERR_PTR(-EBUSY), | |
500 | *index); | |
501 | } | |
502 | spin_unlock(&idrinfo->lock); | |
503 | return ret; | |
504 | } | |
505 | EXPORT_SYMBOL(tcf_idr_check_alloc); | |
506 | ||
65a206c0 CM |
507 | void tcf_idrinfo_destroy(const struct tc_action_ops *ops, |
508 | struct tcf_idrinfo *idrinfo) | |
1d4150c0 | 509 | { |
65a206c0 CM |
510 | struct idr *idr = &idrinfo->action_idr; |
511 | struct tc_action *p; | |
512 | int ret; | |
513 | unsigned long id = 1; | |
1d4150c0 | 514 | |
7a457577 | 515 | idr_for_each_entry_ul(idr, p, id) { |
65a206c0 CM |
516 | ret = __tcf_idr_release(p, false, true); |
517 | if (ret == ACT_P_DELETED) | |
518 | module_put(ops->owner); | |
519 | else if (ret < 0) | |
520 | return; | |
1d4150c0 | 521 | } |
65a206c0 | 522 | idr_destroy(&idrinfo->action_idr); |
1d4150c0 | 523 | } |
65a206c0 | 524 | EXPORT_SYMBOL(tcf_idrinfo_destroy); |
1d4150c0 | 525 | |
1f747c26 | 526 | static LIST_HEAD(act_base); |
1da177e4 LT |
527 | static DEFINE_RWLOCK(act_mod_lock); |
528 | ||
ddf97ccd WC |
529 | int tcf_register_action(struct tc_action_ops *act, |
530 | struct pernet_operations *ops) | |
1da177e4 | 531 | { |
1f747c26 | 532 | struct tc_action_ops *a; |
ddf97ccd | 533 | int ret; |
1da177e4 | 534 | |
ddf97ccd | 535 | if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup) |
76c82d7a JHS |
536 | return -EINVAL; |
537 | ||
ab102b80 WC |
538 | /* We have to register pernet ops before making the action ops visible, |
539 | * otherwise tcf_action_init_1() could get a partially initialized | |
540 | * netns. | |
541 | */ | |
542 | ret = register_pernet_subsys(ops); | |
543 | if (ret) | |
544 | return ret; | |
545 | ||
1da177e4 | 546 | write_lock(&act_mod_lock); |
1f747c26 | 547 | list_for_each_entry(a, &act_base, head) { |
1da177e4 LT |
548 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { |
549 | write_unlock(&act_mod_lock); | |
ab102b80 | 550 | unregister_pernet_subsys(ops); |
1da177e4 LT |
551 | return -EEXIST; |
552 | } | |
553 | } | |
1f747c26 | 554 | list_add_tail(&act->head, &act_base); |
1da177e4 | 555 | write_unlock(&act_mod_lock); |
ddf97ccd | 556 | |
1da177e4 LT |
557 | return 0; |
558 | } | |
62e3ba1b | 559 | EXPORT_SYMBOL(tcf_register_action); |
1da177e4 | 560 | |
ddf97ccd WC |
561 | int tcf_unregister_action(struct tc_action_ops *act, |
562 | struct pernet_operations *ops) | |
1da177e4 | 563 | { |
1f747c26 | 564 | struct tc_action_ops *a; |
1da177e4 LT |
565 | int err = -ENOENT; |
566 | ||
567 | write_lock(&act_mod_lock); | |
a792866a ED |
568 | list_for_each_entry(a, &act_base, head) { |
569 | if (a == act) { | |
570 | list_del(&act->head); | |
571 | err = 0; | |
1da177e4 | 572 | break; |
a792866a | 573 | } |
1da177e4 LT |
574 | } |
575 | write_unlock(&act_mod_lock); | |
ab102b80 WC |
576 | if (!err) |
577 | unregister_pernet_subsys(ops); | |
1da177e4 LT |
578 | return err; |
579 | } | |
62e3ba1b | 580 | EXPORT_SYMBOL(tcf_unregister_action); |
1da177e4 LT |
581 | |
582 | /* lookup by name */ | |
583 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
584 | { | |
a792866a | 585 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
586 | |
587 | if (kind) { | |
588 | read_lock(&act_mod_lock); | |
1f747c26 | 589 | list_for_each_entry(a, &act_base, head) { |
1da177e4 | 590 | if (strcmp(kind, a->kind) == 0) { |
a792866a ED |
591 | if (try_module_get(a->owner)) |
592 | res = a; | |
1da177e4 LT |
593 | break; |
594 | } | |
595 | } | |
596 | read_unlock(&act_mod_lock); | |
597 | } | |
a792866a | 598 | return res; |
1da177e4 LT |
599 | } |
600 | ||
7ba699c6 PM |
601 | /* lookup by nlattr */ |
602 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) | |
1da177e4 | 603 | { |
a792866a | 604 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
605 | |
606 | if (kind) { | |
607 | read_lock(&act_mod_lock); | |
1f747c26 | 608 | list_for_each_entry(a, &act_base, head) { |
7ba699c6 | 609 | if (nla_strcmp(kind, a->kind) == 0) { |
a792866a ED |
610 | if (try_module_get(a->owner)) |
611 | res = a; | |
1da177e4 LT |
612 | break; |
613 | } | |
614 | } | |
615 | read_unlock(&act_mod_lock); | |
616 | } | |
a792866a | 617 | return res; |
1da177e4 | 618 | } |
1da177e4 | 619 | |
e0ee84de JHS |
620 | /*TCA_ACT_MAX_PRIO is 32, there count upto 32 */ |
621 | #define TCA_ACT_MAX_PRIO_MASK 0x1FF | |
22dc13c8 WC |
622 | int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, |
623 | int nr_actions, struct tcf_result *res) | |
1da177e4 | 624 | { |
e0ee84de JHS |
625 | u32 jmp_prgcnt = 0; |
626 | u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */ | |
ec1a9cca JP |
627 | int i; |
628 | int ret = TC_ACT_OK; | |
1da177e4 | 629 | |
e7246e12 WB |
630 | if (skb_skip_tc_classify(skb)) |
631 | return TC_ACT_OK; | |
632 | ||
e0ee84de | 633 | restart_act_graph: |
22dc13c8 WC |
634 | for (i = 0; i < nr_actions; i++) { |
635 | const struct tc_action *a = actions[i]; | |
636 | ||
e0ee84de JHS |
637 | if (jmp_prgcnt > 0) { |
638 | jmp_prgcnt -= 1; | |
639 | continue; | |
640 | } | |
1da177e4 | 641 | repeat: |
63acd680 | 642 | ret = a->ops->act(skb, a, res); |
63acd680 JHS |
643 | if (ret == TC_ACT_REPEAT) |
644 | goto repeat; /* we need a ttl - JHS */ | |
e0ee84de | 645 | |
9da3242e | 646 | if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) { |
e0ee84de JHS |
647 | jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK; |
648 | if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) { | |
649 | /* faulty opcode, stop pipeline */ | |
650 | return TC_ACT_OK; | |
651 | } else { | |
652 | jmp_ttl -= 1; | |
653 | if (jmp_ttl > 0) | |
654 | goto restart_act_graph; | |
655 | else /* faulty graph, stop pipeline */ | |
656 | return TC_ACT_OK; | |
657 | } | |
db50514f JP |
658 | } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) { |
659 | tcf_action_goto_chain_exec(a, res); | |
e0ee84de JHS |
660 | } |
661 | ||
63acd680 | 662 | if (ret != TC_ACT_PIPE) |
e7246e12 | 663 | break; |
1da177e4 | 664 | } |
e0ee84de | 665 | |
1da177e4 LT |
666 | return ret; |
667 | } | |
62e3ba1b | 668 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 | 669 | |
90b73b77 | 670 | int tcf_action_destroy(struct tc_action *actions[], int bind) |
1da177e4 | 671 | { |
255cd50f | 672 | const struct tc_action_ops *ops; |
90b73b77 VB |
673 | struct tc_action *a; |
674 | int ret = 0, i; | |
1da177e4 | 675 | |
90b73b77 VB |
676 | for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) { |
677 | a = actions[i]; | |
678 | actions[i] = NULL; | |
255cd50f | 679 | ops = a->ops; |
65a206c0 | 680 | ret = __tcf_idr_release(a, bind, true); |
55334a5d | 681 | if (ret == ACT_P_DELETED) |
255cd50f | 682 | module_put(ops->owner); |
55334a5d WC |
683 | else if (ret < 0) |
684 | return ret; | |
1da177e4 | 685 | } |
55334a5d | 686 | return ret; |
1da177e4 LT |
687 | } |
688 | ||
97763dc0 PA |
689 | static int tcf_action_destroy_1(struct tc_action *a, int bind) |
690 | { | |
691 | struct tc_action *actions[] = { a, NULL }; | |
692 | ||
693 | return tcf_action_destroy(actions, bind); | |
694 | } | |
695 | ||
16af6067 VB |
696 | static int tcf_action_put(struct tc_action *p) |
697 | { | |
698 | return __tcf_action_put(p, false); | |
699 | } | |
700 | ||
edfaf94f | 701 | /* Put all actions in this array, skip those NULL's. */ |
90b73b77 | 702 | static void tcf_action_put_many(struct tc_action *actions[]) |
cae422f3 | 703 | { |
90b73b77 | 704 | int i; |
cae422f3 | 705 | |
edfaf94f | 706 | for (i = 0; i < TCA_ACT_MAX_PRIO; i++) { |
90b73b77 | 707 | struct tc_action *a = actions[i]; |
edfaf94f | 708 | const struct tc_action_ops *ops; |
cae422f3 | 709 | |
edfaf94f CW |
710 | if (!a) |
711 | continue; | |
712 | ops = a->ops; | |
cae422f3 VB |
713 | if (tcf_action_put(a)) |
714 | module_put(ops->owner); | |
715 | } | |
716 | } | |
717 | ||
1da177e4 LT |
718 | int |
719 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
720 | { | |
1da177e4 LT |
721 | return a->ops->dump(skb, a, bind, ref); |
722 | } | |
723 | ||
724 | int | |
725 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
726 | { | |
727 | int err = -EINVAL; | |
27a884dc | 728 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 729 | struct nlattr *nest; |
eec94fdb | 730 | struct tc_cookie *cookie; |
1da177e4 | 731 | |
1b34ec43 DM |
732 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) |
733 | goto nla_put_failure; | |
1da177e4 | 734 | if (tcf_action_copy_stats(skb, a, 0)) |
7ba699c6 | 735 | goto nla_put_failure; |
eec94fdb VB |
736 | |
737 | rcu_read_lock(); | |
738 | cookie = rcu_dereference(a->act_cookie); | |
739 | if (cookie) { | |
740 | if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) { | |
741 | rcu_read_unlock(); | |
1045ba77 | 742 | goto nla_put_failure; |
eec94fdb | 743 | } |
1045ba77 | 744 | } |
eec94fdb | 745 | rcu_read_unlock(); |
1045ba77 | 746 | |
4b3550ef PM |
747 | nest = nla_nest_start(skb, TCA_OPTIONS); |
748 | if (nest == NULL) | |
749 | goto nla_put_failure; | |
cc7ec456 ED |
750 | err = tcf_action_dump_old(skb, a, bind, ref); |
751 | if (err > 0) { | |
4b3550ef | 752 | nla_nest_end(skb, nest); |
1da177e4 LT |
753 | return err; |
754 | } | |
755 | ||
7ba699c6 | 756 | nla_put_failure: |
dc5fc579 | 757 | nlmsg_trim(skb, b); |
1da177e4 LT |
758 | return -1; |
759 | } | |
62e3ba1b | 760 | EXPORT_SYMBOL(tcf_action_dump_1); |
1da177e4 | 761 | |
90b73b77 | 762 | int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], |
0b0f43fe | 763 | int bind, int ref) |
1da177e4 LT |
764 | { |
765 | struct tc_action *a; | |
90b73b77 | 766 | int err = -EINVAL, i; |
4b3550ef | 767 | struct nlattr *nest; |
1da177e4 | 768 | |
90b73b77 VB |
769 | for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) { |
770 | a = actions[i]; | |
4b3550ef PM |
771 | nest = nla_nest_start(skb, a->order); |
772 | if (nest == NULL) | |
773 | goto nla_put_failure; | |
1da177e4 LT |
774 | err = tcf_action_dump_1(skb, a, bind, ref); |
775 | if (err < 0) | |
4fe683f5 | 776 | goto errout; |
4b3550ef | 777 | nla_nest_end(skb, nest); |
1da177e4 LT |
778 | } |
779 | ||
780 | return 0; | |
781 | ||
7ba699c6 | 782 | nla_put_failure: |
4fe683f5 TG |
783 | err = -EINVAL; |
784 | errout: | |
4b3550ef | 785 | nla_nest_cancel(skb, nest); |
4fe683f5 | 786 | return err; |
1da177e4 LT |
787 | } |
788 | ||
e0535ce5 | 789 | static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb) |
1045ba77 | 790 | { |
e0535ce5 WB |
791 | struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL); |
792 | if (!c) | |
793 | return NULL; | |
794 | ||
795 | c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL); | |
796 | if (!c->data) { | |
797 | kfree(c); | |
798 | return NULL; | |
1045ba77 | 799 | } |
e0535ce5 | 800 | c->len = nla_len(tb[TCA_ACT_COOKIE]); |
1045ba77 | 801 | |
e0535ce5 | 802 | return c; |
1045ba77 JHS |
803 | } |
804 | ||
802bfb19 PA |
805 | static bool tcf_action_valid(int action) |
806 | { | |
807 | int opcode = TC_ACT_EXT_OPCODE(action); | |
808 | ||
809 | if (!opcode) | |
810 | return action <= TC_ACT_VALUE_MAX; | |
811 | return opcode <= TC_ACT_EXT_OPCODE_MAX || action == TC_ACT_UNSPEC; | |
812 | } | |
813 | ||
9fb9f251 JP |
814 | struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, |
815 | struct nlattr *nla, struct nlattr *est, | |
aea0d727 | 816 | char *name, int ovr, int bind, |
789871bb | 817 | bool rtnl_held, |
aea0d727 | 818 | struct netlink_ext_ack *extack) |
1da177e4 LT |
819 | { |
820 | struct tc_action *a; | |
821 | struct tc_action_ops *a_o; | |
e0535ce5 | 822 | struct tc_cookie *cookie = NULL; |
1da177e4 | 823 | char act_name[IFNAMSIZ]; |
cc7ec456 | 824 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 825 | struct nlattr *kind; |
ab27cfb8 | 826 | int err; |
1da177e4 | 827 | |
1da177e4 | 828 | if (name == NULL) { |
84ae017a | 829 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack); |
cee63723 | 830 | if (err < 0) |
1da177e4 | 831 | goto err_out; |
cee63723 | 832 | err = -EINVAL; |
7ba699c6 | 833 | kind = tb[TCA_ACT_KIND]; |
84ae017a AA |
834 | if (!kind) { |
835 | NL_SET_ERR_MSG(extack, "TC action kind must be specified"); | |
1da177e4 | 836 | goto err_out; |
84ae017a AA |
837 | } |
838 | if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) { | |
839 | NL_SET_ERR_MSG(extack, "TC action name too long"); | |
1da177e4 | 840 | goto err_out; |
84ae017a | 841 | } |
e0535ce5 WB |
842 | if (tb[TCA_ACT_COOKIE]) { |
843 | int cklen = nla_len(tb[TCA_ACT_COOKIE]); | |
844 | ||
84ae017a AA |
845 | if (cklen > TC_COOKIE_MAX_SIZE) { |
846 | NL_SET_ERR_MSG(extack, "TC cookie size above the maximum"); | |
e0535ce5 | 847 | goto err_out; |
84ae017a | 848 | } |
e0535ce5 WB |
849 | |
850 | cookie = nla_memdup_cookie(tb); | |
851 | if (!cookie) { | |
84ae017a | 852 | NL_SET_ERR_MSG(extack, "No memory to generate TC cookie"); |
e0535ce5 WB |
853 | err = -ENOMEM; |
854 | goto err_out; | |
855 | } | |
856 | } | |
1da177e4 | 857 | } else { |
84ae017a AA |
858 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) { |
859 | NL_SET_ERR_MSG(extack, "TC action name too long"); | |
860 | err = -EINVAL; | |
1da177e4 | 861 | goto err_out; |
84ae017a | 862 | } |
1da177e4 LT |
863 | } |
864 | ||
865 | a_o = tc_lookup_action_n(act_name); | |
866 | if (a_o == NULL) { | |
95a5afca | 867 | #ifdef CONFIG_MODULES |
789871bb VB |
868 | if (rtnl_held) |
869 | rtnl_unlock(); | |
4bba3925 | 870 | request_module("act_%s", act_name); |
789871bb VB |
871 | if (rtnl_held) |
872 | rtnl_lock(); | |
1da177e4 LT |
873 | |
874 | a_o = tc_lookup_action_n(act_name); | |
875 | ||
876 | /* We dropped the RTNL semaphore in order to | |
877 | * perform the module load. So, even if we | |
878 | * succeeded in loading the module we have to | |
879 | * tell the caller to replay the request. We | |
880 | * indicate this using -EAGAIN. | |
881 | */ | |
882 | if (a_o != NULL) { | |
ab27cfb8 | 883 | err = -EAGAIN; |
1da177e4 LT |
884 | goto err_mod; |
885 | } | |
886 | #endif | |
84ae017a | 887 | NL_SET_ERR_MSG(extack, "Failed to load TC action module"); |
ab27cfb8 | 888 | err = -ENOENT; |
1da177e4 LT |
889 | goto err_out; |
890 | } | |
891 | ||
1da177e4 LT |
892 | /* backward compatibility for policer */ |
893 | if (name == NULL) | |
589dad6d | 894 | err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind, |
789871bb | 895 | rtnl_held, extack); |
1da177e4 | 896 | else |
789871bb VB |
897 | err = a_o->init(net, nla, est, &a, ovr, bind, rtnl_held, |
898 | extack); | |
ab27cfb8 | 899 | if (err < 0) |
a85a970a | 900 | goto err_mod; |
1da177e4 | 901 | |
eec94fdb VB |
902 | if (!name && tb[TCA_ACT_COOKIE]) |
903 | tcf_set_action_cookie(&a->act_cookie, cookie); | |
1045ba77 | 904 | |
1da177e4 | 905 | /* module count goes up only when brand new policy is created |
cc7ec456 ED |
906 | * if it exists and is only bound to in a_o->init() then |
907 | * ACT_P_CREATED is not returned (a zero is). | |
908 | */ | |
ab27cfb8 | 909 | if (err != ACT_P_CREATED) |
1da177e4 | 910 | module_put(a_o->owner); |
1da177e4 | 911 | |
db50514f JP |
912 | if (TC_ACT_EXT_CMP(a->tcfa_action, TC_ACT_GOTO_CHAIN)) { |
913 | err = tcf_action_goto_chain_init(a, tp); | |
914 | if (err) { | |
97763dc0 | 915 | tcf_action_destroy_1(a, bind); |
84ae017a | 916 | NL_SET_ERR_MSG(extack, "Failed to init TC action chain"); |
db50514f JP |
917 | return ERR_PTR(err); |
918 | } | |
919 | } | |
920 | ||
802bfb19 | 921 | if (!tcf_action_valid(a->tcfa_action)) { |
97763dc0 PA |
922 | tcf_action_destroy_1(a, bind); |
923 | NL_SET_ERR_MSG(extack, "Invalid control action value"); | |
924 | return ERR_PTR(-EINVAL); | |
802bfb19 PA |
925 | } |
926 | ||
1da177e4 LT |
927 | return a; |
928 | ||
1da177e4 LT |
929 | err_mod: |
930 | module_put(a_o->owner); | |
931 | err_out: | |
e0535ce5 WB |
932 | if (cookie) { |
933 | kfree(cookie->data); | |
934 | kfree(cookie); | |
935 | } | |
ab27cfb8 | 936 | return ERR_PTR(err); |
1da177e4 LT |
937 | } |
938 | ||
90b73b77 VB |
939 | /* Returns numbers of initialized actions or negative error. */ |
940 | ||
9fb9f251 JP |
941 | int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, |
942 | struct nlattr *est, char *name, int ovr, int bind, | |
90b73b77 | 943 | struct tc_action *actions[], size_t *attr_size, |
789871bb | 944 | bool rtnl_held, struct netlink_ext_ack *extack) |
1da177e4 | 945 | { |
cc7ec456 | 946 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 | 947 | struct tc_action *act; |
4e76e75d | 948 | size_t sz = 0; |
cee63723 | 949 | int err; |
1da177e4 LT |
950 | int i; |
951 | ||
84ae017a | 952 | err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, extack); |
cee63723 | 953 | if (err < 0) |
33be6271 | 954 | return err; |
1da177e4 | 955 | |
7ba699c6 | 956 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
aea0d727 | 957 | act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind, |
789871bb | 958 | rtnl_held, extack); |
33be6271 WC |
959 | if (IS_ERR(act)) { |
960 | err = PTR_ERR(act); | |
1da177e4 | 961 | goto err; |
33be6271 | 962 | } |
7ba699c6 | 963 | act->order = i; |
4e76e75d | 964 | sz += tcf_action_fill_size(act); |
90b73b77 VB |
965 | /* Start from index 0 */ |
966 | actions[i - 1] = act; | |
1da177e4 | 967 | } |
aecc5cef | 968 | |
4e76e75d | 969 | *attr_size = tcf_action_full_attrs_size(sz); |
90b73b77 | 970 | return i - 1; |
1da177e4 LT |
971 | |
972 | err: | |
33be6271 WC |
973 | tcf_action_destroy(actions, bind); |
974 | return err; | |
1da177e4 LT |
975 | } |
976 | ||
ec0595cc | 977 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p, |
1da177e4 LT |
978 | int compat_mode) |
979 | { | |
980 | int err = 0; | |
981 | struct gnet_dump d; | |
10297b99 | 982 | |
7eb8896d | 983 | if (p == NULL) |
1da177e4 LT |
984 | goto errout; |
985 | ||
986 | /* compat_mode being true specifies a call that is supposed | |
06fe9fb4 | 987 | * to add additional backward compatibility statistic TLVs. |
1da177e4 LT |
988 | */ |
989 | if (compat_mode) { | |
ec0595cc | 990 | if (p->type == TCA_OLD_COMPAT) |
1da177e4 | 991 | err = gnet_stats_start_copy_compat(skb, 0, |
9854518e ND |
992 | TCA_STATS, |
993 | TCA_XSTATS, | |
ec0595cc | 994 | &p->tcfa_lock, &d, |
9854518e | 995 | TCA_PAD); |
1da177e4 LT |
996 | else |
997 | return 0; | |
998 | } else | |
999 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
ec0595cc | 1000 | &p->tcfa_lock, &d, TCA_ACT_PAD); |
1da177e4 LT |
1001 | |
1002 | if (err < 0) | |
1003 | goto errout; | |
1004 | ||
ec0595cc | 1005 | if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 || |
28169aba EC |
1006 | gnet_stats_copy_basic_hw(NULL, &d, p->cpu_bstats_hw, |
1007 | &p->tcfa_bstats_hw) < 0 || | |
1c0d32fd | 1008 | gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 || |
519c818e | 1009 | gnet_stats_copy_queue(&d, p->cpu_qstats, |
ec0595cc WC |
1010 | &p->tcfa_qstats, |
1011 | p->tcfa_qstats.qlen) < 0) | |
1da177e4 LT |
1012 | goto errout; |
1013 | ||
1014 | if (gnet_stats_finish_copy(&d) < 0) | |
1015 | goto errout; | |
1016 | ||
1017 | return 0; | |
1018 | ||
1019 | errout: | |
1020 | return -1; | |
1021 | } | |
1022 | ||
90b73b77 | 1023 | static int tca_get_fill(struct sk_buff *skb, struct tc_action *actions[], |
0b0f43fe JHS |
1024 | u32 portid, u32 seq, u16 flags, int event, int bind, |
1025 | int ref) | |
1da177e4 LT |
1026 | { |
1027 | struct tcamsg *t; | |
1028 | struct nlmsghdr *nlh; | |
27a884dc | 1029 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1030 | struct nlattr *nest; |
1da177e4 | 1031 | |
15e47304 | 1032 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags); |
8b00a53c DM |
1033 | if (!nlh) |
1034 | goto out_nlmsg_trim; | |
1035 | t = nlmsg_data(nlh); | |
1da177e4 | 1036 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1037 | t->tca__pad1 = 0; |
1038 | t->tca__pad2 = 0; | |
10297b99 | 1039 | |
4b3550ef | 1040 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
1af85155 | 1041 | if (!nest) |
8b00a53c | 1042 | goto out_nlmsg_trim; |
1da177e4 | 1043 | |
33be6271 | 1044 | if (tcf_action_dump(skb, actions, bind, ref) < 0) |
8b00a53c | 1045 | goto out_nlmsg_trim; |
1da177e4 | 1046 | |
4b3550ef | 1047 | nla_nest_end(skb, nest); |
10297b99 | 1048 | |
27a884dc | 1049 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1050 | return skb->len; |
1051 | ||
8b00a53c | 1052 | out_nlmsg_trim: |
dc5fc579 | 1053 | nlmsg_trim(skb, b); |
1da177e4 LT |
1054 | return -1; |
1055 | } | |
1056 | ||
1057 | static int | |
c4c4290c | 1058 | tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n, |
90b73b77 | 1059 | struct tc_action *actions[], int event, |
84ae017a | 1060 | struct netlink_ext_ack *extack) |
1da177e4 LT |
1061 | { |
1062 | struct sk_buff *skb; | |
1da177e4 LT |
1063 | |
1064 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1065 | if (!skb) | |
1066 | return -ENOBUFS; | |
0b0f43fe | 1067 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, |
3f7c72bc | 1068 | 0, 1) <= 0) { |
84ae017a | 1069 | NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action"); |
1da177e4 LT |
1070 | kfree_skb(skb); |
1071 | return -EINVAL; | |
1072 | } | |
2942e900 | 1073 | |
15e47304 | 1074 | return rtnl_unicast(skb, net, portid); |
1da177e4 LT |
1075 | } |
1076 | ||
ddf97ccd | 1077 | static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla, |
84ae017a AA |
1078 | struct nlmsghdr *n, u32 portid, |
1079 | struct netlink_ext_ack *extack) | |
1da177e4 | 1080 | { |
cc7ec456 | 1081 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
a85a970a | 1082 | const struct tc_action_ops *ops; |
1da177e4 LT |
1083 | struct tc_action *a; |
1084 | int index; | |
ab27cfb8 | 1085 | int err; |
1da177e4 | 1086 | |
84ae017a | 1087 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack); |
cee63723 | 1088 | if (err < 0) |
ab27cfb8 | 1089 | goto err_out; |
1da177e4 | 1090 | |
cee63723 | 1091 | err = -EINVAL; |
7ba699c6 | 1092 | if (tb[TCA_ACT_INDEX] == NULL || |
84ae017a AA |
1093 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) { |
1094 | NL_SET_ERR_MSG(extack, "Invalid TC action index value"); | |
ab27cfb8 | 1095 | goto err_out; |
84ae017a | 1096 | } |
1587bac4 | 1097 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 1098 | |
ab27cfb8 | 1099 | err = -EINVAL; |
a85a970a | 1100 | ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
84ae017a | 1101 | if (!ops) { /* could happen in batch of actions */ |
f061b48c | 1102 | NL_SET_ERR_MSG(extack, "Specified TC action kind not found"); |
a85a970a | 1103 | goto err_out; |
84ae017a | 1104 | } |
ab27cfb8 | 1105 | err = -ENOENT; |
f061b48c CW |
1106 | if (ops->lookup(net, &a, index) == 0) { |
1107 | NL_SET_ERR_MSG(extack, "TC action with specified index not found"); | |
1da177e4 | 1108 | goto err_mod; |
f061b48c | 1109 | } |
1da177e4 | 1110 | |
a85a970a | 1111 | module_put(ops->owner); |
1da177e4 | 1112 | return a; |
ab27cfb8 | 1113 | |
1da177e4 | 1114 | err_mod: |
a85a970a | 1115 | module_put(ops->owner); |
ab27cfb8 PM |
1116 | err_out: |
1117 | return ERR_PTR(err); | |
1da177e4 LT |
1118 | } |
1119 | ||
7316ae88 | 1120 | static int tca_action_flush(struct net *net, struct nlattr *nla, |
84ae017a AA |
1121 | struct nlmsghdr *n, u32 portid, |
1122 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
1123 | { |
1124 | struct sk_buff *skb; | |
1125 | unsigned char *b; | |
1126 | struct nlmsghdr *nlh; | |
1127 | struct tcamsg *t; | |
1128 | struct netlink_callback dcb; | |
4b3550ef | 1129 | struct nlattr *nest; |
cc7ec456 | 1130 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
a85a970a | 1131 | const struct tc_action_ops *ops; |
7ba699c6 | 1132 | struct nlattr *kind; |
36723873 | 1133 | int err = -ENOMEM; |
1da177e4 | 1134 | |
1da177e4 | 1135 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
84ae017a | 1136 | if (!skb) |
36723873 | 1137 | return err; |
1da177e4 | 1138 | |
27a884dc | 1139 | b = skb_tail_pointer(skb); |
1da177e4 | 1140 | |
84ae017a | 1141 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack); |
cee63723 | 1142 | if (err < 0) |
1da177e4 LT |
1143 | goto err_out; |
1144 | ||
cee63723 | 1145 | err = -EINVAL; |
7ba699c6 | 1146 | kind = tb[TCA_ACT_KIND]; |
a85a970a | 1147 | ops = tc_lookup_action(kind); |
84ae017a AA |
1148 | if (!ops) { /*some idjot trying to flush unknown action */ |
1149 | NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action"); | |
1da177e4 | 1150 | goto err_out; |
84ae017a | 1151 | } |
1da177e4 | 1152 | |
0b0f43fe JHS |
1153 | nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, |
1154 | sizeof(*t), 0); | |
84ae017a AA |
1155 | if (!nlh) { |
1156 | NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification"); | |
8b00a53c | 1157 | goto out_module_put; |
84ae017a | 1158 | } |
8b00a53c | 1159 | t = nlmsg_data(nlh); |
1da177e4 | 1160 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1161 | t->tca__pad1 = 0; |
1162 | t->tca__pad2 = 0; | |
1da177e4 | 1163 | |
4b3550ef | 1164 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
84ae017a AA |
1165 | if (!nest) { |
1166 | NL_SET_ERR_MSG(extack, "Failed to add new netlink message"); | |
8b00a53c | 1167 | goto out_module_put; |
84ae017a | 1168 | } |
1da177e4 | 1169 | |
41780105 | 1170 | err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops, extack); |
66dede2d DC |
1171 | if (err <= 0) { |
1172 | nla_nest_cancel(skb, nest); | |
8b00a53c | 1173 | goto out_module_put; |
66dede2d | 1174 | } |
1da177e4 | 1175 | |
4b3550ef | 1176 | nla_nest_end(skb, nest); |
1da177e4 | 1177 | |
27a884dc | 1178 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 | 1179 | nlh->nlmsg_flags |= NLM_F_ROOT; |
a85a970a | 1180 | module_put(ops->owner); |
15e47304 | 1181 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 1182 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
1183 | if (err > 0) |
1184 | return 0; | |
84ae017a AA |
1185 | if (err < 0) |
1186 | NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification"); | |
1da177e4 LT |
1187 | |
1188 | return err; | |
1189 | ||
8b00a53c | 1190 | out_module_put: |
a85a970a | 1191 | module_put(ops->owner); |
1da177e4 LT |
1192 | err_out: |
1193 | kfree_skb(skb); | |
1da177e4 LT |
1194 | return err; |
1195 | } | |
1196 | ||
b144e7ec | 1197 | static int tcf_action_delete(struct net *net, struct tc_action *actions[]) |
16af6067 | 1198 | { |
97a3f84f | 1199 | int i; |
16af6067 | 1200 | |
90b73b77 VB |
1201 | for (i = 0; i < TCA_ACT_MAX_PRIO && actions[i]; i++) { |
1202 | struct tc_action *a = actions[i]; | |
16af6067 | 1203 | const struct tc_action_ops *ops = a->ops; |
16af6067 VB |
1204 | /* Actions can be deleted concurrently so we must save their |
1205 | * type and id to search again after reference is released. | |
1206 | */ | |
97a3f84f CW |
1207 | struct tcf_idrinfo *idrinfo = a->idrinfo; |
1208 | u32 act_index = a->tcfa_index; | |
16af6067 | 1209 | |
c10bbfae | 1210 | actions[i] = NULL; |
16af6067 VB |
1211 | if (tcf_action_put(a)) { |
1212 | /* last reference, action was deleted concurrently */ | |
1213 | module_put(ops->owner); | |
1214 | } else { | |
97a3f84f CW |
1215 | int ret; |
1216 | ||
16af6067 | 1217 | /* now do the delete */ |
97a3f84f | 1218 | ret = tcf_idr_delete_index(idrinfo, act_index); |
edfaf94f | 1219 | if (ret < 0) |
16af6067 VB |
1220 | return ret; |
1221 | } | |
1222 | } | |
1223 | return 0; | |
1224 | } | |
1225 | ||
a56e1953 | 1226 | static int |
90b73b77 | 1227 | tcf_del_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[], |
edfaf94f | 1228 | u32 portid, size_t attr_size, struct netlink_ext_ack *extack) |
a56e1953 WC |
1229 | { |
1230 | int ret; | |
1231 | struct sk_buff *skb; | |
1232 | ||
d04e6990 RM |
1233 | skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size, |
1234 | GFP_KERNEL); | |
a56e1953 WC |
1235 | if (!skb) |
1236 | return -ENOBUFS; | |
1237 | ||
1238 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION, | |
3f7c72bc | 1239 | 0, 2) <= 0) { |
84ae017a | 1240 | NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes"); |
a56e1953 WC |
1241 | kfree_skb(skb); |
1242 | return -EINVAL; | |
1243 | } | |
1244 | ||
1245 | /* now do the delete */ | |
b144e7ec | 1246 | ret = tcf_action_delete(net, actions); |
55334a5d | 1247 | if (ret < 0) { |
84ae017a | 1248 | NL_SET_ERR_MSG(extack, "Failed to delete TC action"); |
55334a5d WC |
1249 | kfree_skb(skb); |
1250 | return ret; | |
1251 | } | |
a56e1953 WC |
1252 | |
1253 | ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
1254 | n->nlmsg_flags & NLM_F_ECHO); | |
1255 | if (ret > 0) | |
1256 | return 0; | |
1257 | return ret; | |
1258 | } | |
1259 | ||
1da177e4 | 1260 | static int |
7316ae88 | 1261 | tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
84ae017a | 1262 | u32 portid, int event, struct netlink_ext_ack *extack) |
1da177e4 | 1263 | { |
cee63723 | 1264 | int i, ret; |
cc7ec456 | 1265 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 | 1266 | struct tc_action *act; |
d04e6990 | 1267 | size_t attr_size = 0; |
edfaf94f | 1268 | struct tc_action *actions[TCA_ACT_MAX_PRIO] = {}; |
1da177e4 | 1269 | |
84ae017a | 1270 | ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, extack); |
cee63723 PM |
1271 | if (ret < 0) |
1272 | return ret; | |
1da177e4 | 1273 | |
cc7ec456 | 1274 | if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) { |
1af85155 | 1275 | if (tb[1]) |
84ae017a | 1276 | return tca_action_flush(net, tb[1], n, portid, extack); |
1af85155 | 1277 | |
84ae017a | 1278 | NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action"); |
1af85155 | 1279 | return -EINVAL; |
1da177e4 LT |
1280 | } |
1281 | ||
7ba699c6 | 1282 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
84ae017a | 1283 | act = tcf_action_get_1(net, tb[i], n, portid, extack); |
ab27cfb8 PM |
1284 | if (IS_ERR(act)) { |
1285 | ret = PTR_ERR(act); | |
1da177e4 | 1286 | goto err; |
ab27cfb8 | 1287 | } |
7ba699c6 | 1288 | act->order = i; |
4e76e75d | 1289 | attr_size += tcf_action_fill_size(act); |
90b73b77 | 1290 | actions[i - 1] = act; |
1da177e4 | 1291 | } |
4e76e75d RM |
1292 | |
1293 | attr_size = tcf_action_full_attrs_size(attr_size); | |
1da177e4 LT |
1294 | |
1295 | if (event == RTM_GETACTION) | |
90b73b77 | 1296 | ret = tcf_get_notify(net, portid, n, actions, event, extack); |
1da177e4 | 1297 | else { /* delete */ |
edfaf94f | 1298 | ret = tcf_del_notify(net, n, actions, portid, attr_size, extack); |
a56e1953 | 1299 | if (ret) |
1da177e4 | 1300 | goto err; |
edfaf94f | 1301 | return 0; |
1da177e4 LT |
1302 | } |
1303 | err: | |
edfaf94f | 1304 | tcf_action_put_many(actions); |
1da177e4 LT |
1305 | return ret; |
1306 | } | |
1307 | ||
a56e1953 | 1308 | static int |
90b73b77 | 1309 | tcf_add_notify(struct net *net, struct nlmsghdr *n, struct tc_action *actions[], |
d04e6990 | 1310 | u32 portid, size_t attr_size, struct netlink_ext_ack *extack) |
1da177e4 | 1311 | { |
1da177e4 | 1312 | struct sk_buff *skb; |
1da177e4 LT |
1313 | int err = 0; |
1314 | ||
d04e6990 RM |
1315 | skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size, |
1316 | GFP_KERNEL); | |
1da177e4 LT |
1317 | if (!skb) |
1318 | return -ENOBUFS; | |
1319 | ||
a56e1953 WC |
1320 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags, |
1321 | RTM_NEWACTION, 0, 0) <= 0) { | |
d143b9e3 | 1322 | NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action"); |
a56e1953 WC |
1323 | kfree_skb(skb); |
1324 | return -EINVAL; | |
1325 | } | |
10297b99 | 1326 | |
a56e1953 WC |
1327 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
1328 | n->nlmsg_flags & NLM_F_ECHO); | |
1da177e4 LT |
1329 | if (err > 0) |
1330 | err = 0; | |
1331 | return err; | |
1da177e4 LT |
1332 | } |
1333 | ||
5a7a5555 | 1334 | static int tcf_action_add(struct net *net, struct nlattr *nla, |
aea0d727 AA |
1335 | struct nlmsghdr *n, u32 portid, int ovr, |
1336 | struct netlink_ext_ack *extack) | |
1da177e4 | 1337 | { |
d04e6990 | 1338 | size_t attr_size = 0; |
1da177e4 | 1339 | int ret = 0; |
90b73b77 | 1340 | struct tc_action *actions[TCA_ACT_MAX_PRIO] = {}; |
1da177e4 | 1341 | |
90b73b77 | 1342 | ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0, actions, |
789871bb | 1343 | &attr_size, true, extack); |
90b73b77 | 1344 | if (ret < 0) |
f07fed82 | 1345 | return ret; |
90b73b77 | 1346 | ret = tcf_add_notify(net, n, actions, portid, attr_size, extack); |
cae422f3 | 1347 | if (ovr) |
90b73b77 | 1348 | tcf_action_put_many(actions); |
1da177e4 | 1349 | |
cae422f3 | 1350 | return ret; |
1da177e4 LT |
1351 | } |
1352 | ||
90825b23 JHS |
1353 | static u32 tcaa_root_flags_allowed = TCA_FLAG_LARGE_DUMP_ON; |
1354 | static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = { | |
1355 | [TCA_ROOT_FLAGS] = { .type = NLA_BITFIELD32, | |
1356 | .validation_data = &tcaa_root_flags_allowed }, | |
e62e484d | 1357 | [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 }, |
90825b23 JHS |
1358 | }; |
1359 | ||
c21ef3e3 DA |
1360 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, |
1361 | struct netlink_ext_ack *extack) | |
1da177e4 | 1362 | { |
3b1e0a65 | 1363 | struct net *net = sock_net(skb->sk); |
90825b23 | 1364 | struct nlattr *tca[TCA_ROOT_MAX + 1]; |
15e47304 | 1365 | u32 portid = skb ? NETLINK_CB(skb).portid : 0; |
1da177e4 LT |
1366 | int ret = 0, ovr = 0; |
1367 | ||
0b0f43fe JHS |
1368 | if ((n->nlmsg_type != RTM_GETACTION) && |
1369 | !netlink_capable(skb, CAP_NET_ADMIN)) | |
dfc47ef8 EB |
1370 | return -EPERM; |
1371 | ||
90825b23 | 1372 | ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ROOT_MAX, NULL, |
c21ef3e3 | 1373 | extack); |
7ba699c6 PM |
1374 | if (ret < 0) |
1375 | return ret; | |
1376 | ||
1377 | if (tca[TCA_ACT_TAB] == NULL) { | |
84ae017a | 1378 | NL_SET_ERR_MSG(extack, "Netlink action attributes missing"); |
1da177e4 LT |
1379 | return -EINVAL; |
1380 | } | |
1381 | ||
cc7ec456 | 1382 | /* n->nlmsg_flags & NLM_F_CREATE */ |
1da177e4 LT |
1383 | switch (n->nlmsg_type) { |
1384 | case RTM_NEWACTION: | |
1385 | /* we are going to assume all other flags | |
25985edc | 1386 | * imply create only if it doesn't exist |
1da177e4 LT |
1387 | * Note that CREATE | EXCL implies that |
1388 | * but since we want avoid ambiguity (eg when flags | |
1389 | * is zero) then just set this | |
1390 | */ | |
cc7ec456 | 1391 | if (n->nlmsg_flags & NLM_F_REPLACE) |
1da177e4 LT |
1392 | ovr = 1; |
1393 | replay: | |
aea0d727 AA |
1394 | ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr, |
1395 | extack); | |
1da177e4 LT |
1396 | if (ret == -EAGAIN) |
1397 | goto replay; | |
1398 | break; | |
1399 | case RTM_DELACTION: | |
7316ae88 | 1400 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
84ae017a | 1401 | portid, RTM_DELACTION, extack); |
1da177e4 LT |
1402 | break; |
1403 | case RTM_GETACTION: | |
7316ae88 | 1404 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
84ae017a | 1405 | portid, RTM_GETACTION, extack); |
1da177e4 LT |
1406 | break; |
1407 | default: | |
1408 | BUG(); | |
1409 | } | |
1410 | ||
1411 | return ret; | |
1412 | } | |
1413 | ||
90825b23 | 1414 | static struct nlattr *find_dump_kind(struct nlattr **nla) |
1da177e4 | 1415 | { |
cc7ec456 | 1416 | struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1]; |
7ba699c6 | 1417 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
7ba699c6 | 1418 | struct nlattr *kind; |
1da177e4 | 1419 | |
7ba699c6 | 1420 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
1421 | if (tb1 == NULL) |
1422 | return NULL; | |
1423 | ||
7ba699c6 | 1424 | if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), |
fceb6435 | 1425 | NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0) |
1da177e4 | 1426 | return NULL; |
1da177e4 | 1427 | |
6d834e04 PM |
1428 | if (tb[1] == NULL) |
1429 | return NULL; | |
fceb6435 | 1430 | if (nla_parse_nested(tb2, TCA_ACT_MAX, tb[1], NULL, NULL) < 0) |
1da177e4 | 1431 | return NULL; |
7ba699c6 | 1432 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 1433 | |
26dab893 | 1434 | return kind; |
1da177e4 LT |
1435 | } |
1436 | ||
5a7a5555 | 1437 | static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 1438 | { |
ddf97ccd | 1439 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1440 | struct nlmsghdr *nlh; |
27a884dc | 1441 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1442 | struct nlattr *nest; |
1da177e4 | 1443 | struct tc_action_ops *a_o; |
1da177e4 | 1444 | int ret = 0; |
8b00a53c | 1445 | struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh); |
90825b23 JHS |
1446 | struct nlattr *tb[TCA_ROOT_MAX + 1]; |
1447 | struct nlattr *count_attr = NULL; | |
e62e484d | 1448 | unsigned long jiffy_since = 0; |
90825b23 JHS |
1449 | struct nlattr *kind = NULL; |
1450 | struct nla_bitfield32 bf; | |
e62e484d | 1451 | u32 msecs_since = 0; |
90825b23 JHS |
1452 | u32 act_count = 0; |
1453 | ||
1454 | ret = nlmsg_parse(cb->nlh, sizeof(struct tcamsg), tb, TCA_ROOT_MAX, | |
1455 | tcaa_policy, NULL); | |
1456 | if (ret < 0) | |
1457 | return ret; | |
1da177e4 | 1458 | |
90825b23 | 1459 | kind = find_dump_kind(tb); |
1da177e4 | 1460 | if (kind == NULL) { |
6ff9c364 | 1461 | pr_info("tc_dump_action: action bad kind\n"); |
1da177e4 LT |
1462 | return 0; |
1463 | } | |
1464 | ||
26dab893 | 1465 | a_o = tc_lookup_action(kind); |
cc7ec456 | 1466 | if (a_o == NULL) |
1da177e4 | 1467 | return 0; |
1da177e4 | 1468 | |
90825b23 JHS |
1469 | cb->args[2] = 0; |
1470 | if (tb[TCA_ROOT_FLAGS]) { | |
1471 | bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]); | |
1472 | cb->args[2] = bf.value; | |
1473 | } | |
1474 | ||
e62e484d JHS |
1475 | if (tb[TCA_ROOT_TIME_DELTA]) { |
1476 | msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]); | |
1477 | } | |
1478 | ||
15e47304 | 1479 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
8b00a53c DM |
1480 | cb->nlh->nlmsg_type, sizeof(*t), 0); |
1481 | if (!nlh) | |
1482 | goto out_module_put; | |
90825b23 | 1483 | |
e62e484d JHS |
1484 | if (msecs_since) |
1485 | jiffy_since = jiffies - msecs_to_jiffies(msecs_since); | |
1486 | ||
8b00a53c | 1487 | t = nlmsg_data(nlh); |
1da177e4 | 1488 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1489 | t->tca__pad1 = 0; |
1490 | t->tca__pad2 = 0; | |
e62e484d | 1491 | cb->args[3] = jiffy_since; |
90825b23 JHS |
1492 | count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32)); |
1493 | if (!count_attr) | |
1494 | goto out_module_put; | |
1da177e4 | 1495 | |
4b3550ef PM |
1496 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
1497 | if (nest == NULL) | |
8b00a53c | 1498 | goto out_module_put; |
1da177e4 | 1499 | |
41780105 | 1500 | ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o, NULL); |
1da177e4 | 1501 | if (ret < 0) |
8b00a53c | 1502 | goto out_module_put; |
1da177e4 LT |
1503 | |
1504 | if (ret > 0) { | |
4b3550ef | 1505 | nla_nest_end(skb, nest); |
1da177e4 | 1506 | ret = skb->len; |
90825b23 JHS |
1507 | act_count = cb->args[1]; |
1508 | memcpy(nla_data(count_attr), &act_count, sizeof(u32)); | |
1509 | cb->args[1] = 0; | |
1da177e4 | 1510 | } else |
ebecaa66 | 1511 | nlmsg_trim(skb, b); |
1da177e4 | 1512 | |
27a884dc | 1513 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
15e47304 | 1514 | if (NETLINK_CB(cb->skb).portid && ret) |
1da177e4 LT |
1515 | nlh->nlmsg_flags |= NLM_F_MULTI; |
1516 | module_put(a_o->owner); | |
1517 | return skb->len; | |
1518 | ||
8b00a53c | 1519 | out_module_put: |
1da177e4 | 1520 | module_put(a_o->owner); |
dc5fc579 | 1521 | nlmsg_trim(skb, b); |
1da177e4 LT |
1522 | return skb->len; |
1523 | } | |
1524 | ||
b3f55bdd JP |
1525 | struct tcf_action_net { |
1526 | struct rhashtable egdev_ht; | |
1527 | }; | |
1528 | ||
1529 | static unsigned int tcf_action_net_id; | |
1530 | ||
1531 | struct tcf_action_egdev_cb { | |
1532 | struct list_head list; | |
1533 | tc_setup_cb_t *cb; | |
1534 | void *cb_priv; | |
1535 | }; | |
1536 | ||
1537 | struct tcf_action_egdev { | |
1538 | struct rhash_head ht_node; | |
1539 | const struct net_device *dev; | |
1540 | unsigned int refcnt; | |
1541 | struct list_head cb_list; | |
1542 | }; | |
1543 | ||
1544 | static const struct rhashtable_params tcf_action_egdev_ht_params = { | |
1545 | .key_offset = offsetof(struct tcf_action_egdev, dev), | |
1546 | .head_offset = offsetof(struct tcf_action_egdev, ht_node), | |
1547 | .key_len = sizeof(const struct net_device *), | |
1548 | }; | |
1549 | ||
1550 | static struct tcf_action_egdev * | |
1551 | tcf_action_egdev_lookup(const struct net_device *dev) | |
1552 | { | |
1553 | struct net *net = dev_net(dev); | |
1554 | struct tcf_action_net *tan = net_generic(net, tcf_action_net_id); | |
1555 | ||
1556 | return rhashtable_lookup_fast(&tan->egdev_ht, &dev, | |
1557 | tcf_action_egdev_ht_params); | |
1558 | } | |
1559 | ||
1560 | static struct tcf_action_egdev * | |
1561 | tcf_action_egdev_get(const struct net_device *dev) | |
1562 | { | |
1563 | struct tcf_action_egdev *egdev; | |
1564 | struct tcf_action_net *tan; | |
1565 | ||
1566 | egdev = tcf_action_egdev_lookup(dev); | |
1567 | if (egdev) | |
1568 | goto inc_ref; | |
1569 | ||
1570 | egdev = kzalloc(sizeof(*egdev), GFP_KERNEL); | |
1571 | if (!egdev) | |
1572 | return NULL; | |
1573 | INIT_LIST_HEAD(&egdev->cb_list); | |
0843c092 | 1574 | egdev->dev = dev; |
b3f55bdd JP |
1575 | tan = net_generic(dev_net(dev), tcf_action_net_id); |
1576 | rhashtable_insert_fast(&tan->egdev_ht, &egdev->ht_node, | |
1577 | tcf_action_egdev_ht_params); | |
1578 | ||
1579 | inc_ref: | |
1580 | egdev->refcnt++; | |
1581 | return egdev; | |
1582 | } | |
1583 | ||
1584 | static void tcf_action_egdev_put(struct tcf_action_egdev *egdev) | |
1585 | { | |
1586 | struct tcf_action_net *tan; | |
1587 | ||
1588 | if (--egdev->refcnt) | |
1589 | return; | |
1590 | tan = net_generic(dev_net(egdev->dev), tcf_action_net_id); | |
1591 | rhashtable_remove_fast(&tan->egdev_ht, &egdev->ht_node, | |
1592 | tcf_action_egdev_ht_params); | |
1593 | kfree(egdev); | |
1594 | } | |
1595 | ||
1596 | static struct tcf_action_egdev_cb * | |
1597 | tcf_action_egdev_cb_lookup(struct tcf_action_egdev *egdev, | |
1598 | tc_setup_cb_t *cb, void *cb_priv) | |
1599 | { | |
1600 | struct tcf_action_egdev_cb *egdev_cb; | |
1601 | ||
1602 | list_for_each_entry(egdev_cb, &egdev->cb_list, list) | |
1603 | if (egdev_cb->cb == cb && egdev_cb->cb_priv == cb_priv) | |
1604 | return egdev_cb; | |
1605 | return NULL; | |
1606 | } | |
1607 | ||
1608 | static int tcf_action_egdev_cb_call(struct tcf_action_egdev *egdev, | |
1609 | enum tc_setup_type type, | |
1610 | void *type_data, bool err_stop) | |
1611 | { | |
1612 | struct tcf_action_egdev_cb *egdev_cb; | |
1613 | int ok_count = 0; | |
1614 | int err; | |
1615 | ||
1616 | list_for_each_entry(egdev_cb, &egdev->cb_list, list) { | |
1617 | err = egdev_cb->cb(type, type_data, egdev_cb->cb_priv); | |
1618 | if (err) { | |
1619 | if (err_stop) | |
1620 | return err; | |
1621 | } else { | |
1622 | ok_count++; | |
1623 | } | |
1624 | } | |
1625 | return ok_count; | |
1626 | } | |
1627 | ||
1628 | static int tcf_action_egdev_cb_add(struct tcf_action_egdev *egdev, | |
1629 | tc_setup_cb_t *cb, void *cb_priv) | |
1630 | { | |
1631 | struct tcf_action_egdev_cb *egdev_cb; | |
1632 | ||
1633 | egdev_cb = tcf_action_egdev_cb_lookup(egdev, cb, cb_priv); | |
1634 | if (WARN_ON(egdev_cb)) | |
1635 | return -EEXIST; | |
1636 | egdev_cb = kzalloc(sizeof(*egdev_cb), GFP_KERNEL); | |
1637 | if (!egdev_cb) | |
1638 | return -ENOMEM; | |
1639 | egdev_cb->cb = cb; | |
1640 | egdev_cb->cb_priv = cb_priv; | |
1641 | list_add(&egdev_cb->list, &egdev->cb_list); | |
1642 | return 0; | |
1643 | } | |
1644 | ||
1645 | static void tcf_action_egdev_cb_del(struct tcf_action_egdev *egdev, | |
1646 | tc_setup_cb_t *cb, void *cb_priv) | |
1647 | { | |
1648 | struct tcf_action_egdev_cb *egdev_cb; | |
1649 | ||
1650 | egdev_cb = tcf_action_egdev_cb_lookup(egdev, cb, cb_priv); | |
1651 | if (WARN_ON(!egdev_cb)) | |
1652 | return; | |
1653 | list_del(&egdev_cb->list); | |
1654 | kfree(egdev_cb); | |
1655 | } | |
1656 | ||
1657 | static int __tc_setup_cb_egdev_register(const struct net_device *dev, | |
1658 | tc_setup_cb_t *cb, void *cb_priv) | |
1659 | { | |
1660 | struct tcf_action_egdev *egdev = tcf_action_egdev_get(dev); | |
1661 | int err; | |
1662 | ||
1663 | if (!egdev) | |
1664 | return -ENOMEM; | |
1665 | err = tcf_action_egdev_cb_add(egdev, cb, cb_priv); | |
1666 | if (err) | |
1667 | goto err_cb_add; | |
1668 | return 0; | |
1669 | ||
1670 | err_cb_add: | |
1671 | tcf_action_egdev_put(egdev); | |
1672 | return err; | |
1673 | } | |
1674 | int tc_setup_cb_egdev_register(const struct net_device *dev, | |
1675 | tc_setup_cb_t *cb, void *cb_priv) | |
1676 | { | |
1677 | int err; | |
1678 | ||
1679 | rtnl_lock(); | |
1680 | err = __tc_setup_cb_egdev_register(dev, cb, cb_priv); | |
1681 | rtnl_unlock(); | |
1682 | return err; | |
1683 | } | |
1684 | EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_register); | |
1685 | ||
1686 | static void __tc_setup_cb_egdev_unregister(const struct net_device *dev, | |
1687 | tc_setup_cb_t *cb, void *cb_priv) | |
1688 | { | |
1689 | struct tcf_action_egdev *egdev = tcf_action_egdev_lookup(dev); | |
1690 | ||
1691 | if (WARN_ON(!egdev)) | |
1692 | return; | |
1693 | tcf_action_egdev_cb_del(egdev, cb, cb_priv); | |
1694 | tcf_action_egdev_put(egdev); | |
1695 | } | |
1696 | void tc_setup_cb_egdev_unregister(const struct net_device *dev, | |
1697 | tc_setup_cb_t *cb, void *cb_priv) | |
1698 | { | |
1699 | rtnl_lock(); | |
1700 | __tc_setup_cb_egdev_unregister(dev, cb, cb_priv); | |
1701 | rtnl_unlock(); | |
1702 | } | |
1703 | EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_unregister); | |
1704 | ||
1705 | int tc_setup_cb_egdev_call(const struct net_device *dev, | |
1706 | enum tc_setup_type type, void *type_data, | |
1707 | bool err_stop) | |
1708 | { | |
1709 | struct tcf_action_egdev *egdev = tcf_action_egdev_lookup(dev); | |
1710 | ||
1711 | if (!egdev) | |
1712 | return 0; | |
1713 | return tcf_action_egdev_cb_call(egdev, type, type_data, err_stop); | |
1714 | } | |
1715 | EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_call); | |
1716 | ||
1717 | static __net_init int tcf_action_net_init(struct net *net) | |
1718 | { | |
1719 | struct tcf_action_net *tan = net_generic(net, tcf_action_net_id); | |
1720 | ||
1721 | return rhashtable_init(&tan->egdev_ht, &tcf_action_egdev_ht_params); | |
1722 | } | |
1723 | ||
1724 | static void __net_exit tcf_action_net_exit(struct net *net) | |
1725 | { | |
1726 | struct tcf_action_net *tan = net_generic(net, tcf_action_net_id); | |
1727 | ||
1728 | rhashtable_destroy(&tan->egdev_ht); | |
1729 | } | |
1730 | ||
1731 | static struct pernet_operations tcf_action_net_ops = { | |
1732 | .init = tcf_action_net_init, | |
1733 | .exit = tcf_action_net_exit, | |
1734 | .id = &tcf_action_net_id, | |
1735 | .size = sizeof(struct tcf_action_net), | |
1736 | }; | |
1737 | ||
1da177e4 LT |
1738 | static int __init tc_action_init(void) |
1739 | { | |
b3f55bdd JP |
1740 | int err; |
1741 | ||
1742 | err = register_pernet_subsys(&tcf_action_net_ops); | |
1743 | if (err) | |
1744 | return err; | |
1745 | ||
b97bac64 FW |
1746 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0); |
1747 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0); | |
c7ac8679 | 1748 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, |
b97bac64 | 1749 | 0); |
1da177e4 | 1750 | |
1da177e4 LT |
1751 | return 0; |
1752 | } | |
1753 | ||
1754 | subsys_initcall(tc_action_init); |