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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; | |
367a8ce8 | 39 | a->goto_chain = tcf_chain_get(tp->chain->block, chain_index, true); |
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 | { | |
47 | tcf_chain_put(a->goto_chain); | |
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 | ||
71 | old = xchg(old_cookie, new_cookie); | |
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 ED |
83 | free_percpu(p->cpu_bstats); |
84 | free_percpu(p->cpu_qstats); | |
1045ba77 | 85 | |
eec94fdb | 86 | tcf_set_action_cookie(&p->act_cookie, NULL); |
db50514f JP |
87 | if (p->goto_chain) |
88 | tcf_action_goto_chain_fini(p); | |
1045ba77 | 89 | |
519c818e ED |
90 | kfree(p); |
91 | } | |
92 | ||
16af6067 | 93 | static void tcf_action_cleanup(struct tc_action *p) |
e9ce1cd3 | 94 | { |
16af6067 VB |
95 | if (p->ops->cleanup) |
96 | p->ops->cleanup(p); | |
97 | ||
1c0d32fd | 98 | gen_kill_estimator(&p->tcfa_rate_est); |
d7fb60b9 | 99 | free_tcf(p); |
e9ce1cd3 | 100 | } |
e9ce1cd3 | 101 | |
16af6067 VB |
102 | static int __tcf_action_put(struct tc_action *p, bool bind) |
103 | { | |
104 | struct tcf_idrinfo *idrinfo = p->idrinfo; | |
105 | ||
106 | if (refcount_dec_and_lock(&p->tcfa_refcnt, &idrinfo->lock)) { | |
107 | if (bind) | |
108 | atomic_dec(&p->tcfa_bindcnt); | |
109 | idr_remove(&idrinfo->action_idr, p->tcfa_index); | |
110 | spin_unlock(&idrinfo->lock); | |
111 | ||
112 | tcf_action_cleanup(p); | |
113 | return 1; | |
114 | } | |
115 | ||
116 | if (bind) | |
117 | atomic_dec(&p->tcfa_bindcnt); | |
118 | ||
119 | return 0; | |
120 | } | |
121 | ||
65a206c0 | 122 | int __tcf_idr_release(struct tc_action *p, bool bind, bool strict) |
e9ce1cd3 DM |
123 | { |
124 | int ret = 0; | |
125 | ||
036bb443 VB |
126 | /* Release with strict==1 and bind==0 is only called through act API |
127 | * interface (classifiers always bind). Only case when action with | |
128 | * positive reference count and zero bind count can exist is when it was | |
129 | * also created with act API (unbinding last classifier will destroy the | |
130 | * action if it was created by classifier). So only case when bind count | |
131 | * can be changed after initial check is when unbound action is | |
132 | * destroyed by act API while classifier binds to action with same id | |
133 | * concurrently. This result either creation of new action(same behavior | |
134 | * as before), or reusing existing action if concurrent process | |
135 | * increments reference count before action is deleted. Both scenarios | |
136 | * are acceptable. | |
137 | */ | |
e9ce1cd3 | 138 | if (p) { |
16af6067 | 139 | if (!bind && strict && atomic_read(&p->tcfa_bindcnt) > 0) |
55334a5d | 140 | return -EPERM; |
e9ce1cd3 | 141 | |
16af6067 | 142 | if (__tcf_action_put(p, bind)) |
1d4150c0 | 143 | ret = ACT_P_DELETED; |
e9ce1cd3 | 144 | } |
28e6b67f | 145 | |
e9ce1cd3 DM |
146 | return ret; |
147 | } | |
65a206c0 | 148 | EXPORT_SYMBOL(__tcf_idr_release); |
e9ce1cd3 | 149 | |
4e76e75d RM |
150 | static size_t tcf_action_shared_attrs_size(const struct tc_action *act) |
151 | { | |
152 | u32 cookie_len = 0; | |
153 | ||
154 | if (act->act_cookie) | |
155 | cookie_len = nla_total_size(act->act_cookie->len); | |
156 | ||
157 | return nla_total_size(0) /* action number nested */ | |
158 | + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */ | |
159 | + cookie_len /* TCA_ACT_COOKIE */ | |
160 | + nla_total_size(0) /* TCA_ACT_STATS nested */ | |
161 | /* TCA_STATS_BASIC */ | |
162 | + nla_total_size_64bit(sizeof(struct gnet_stats_basic)) | |
163 | /* TCA_STATS_QUEUE */ | |
164 | + nla_total_size_64bit(sizeof(struct gnet_stats_queue)) | |
165 | + nla_total_size(0) /* TCA_OPTIONS nested */ | |
166 | + nla_total_size(sizeof(struct tcf_t)); /* TCA_GACT_TM */ | |
167 | } | |
168 | ||
169 | static size_t tcf_action_full_attrs_size(size_t sz) | |
170 | { | |
171 | return NLMSG_HDRLEN /* struct nlmsghdr */ | |
172 | + sizeof(struct tcamsg) | |
173 | + nla_total_size(0) /* TCA_ACT_TAB nested */ | |
174 | + sz; | |
175 | } | |
176 | ||
177 | static size_t tcf_action_fill_size(const struct tc_action *act) | |
178 | { | |
179 | size_t sz = tcf_action_shared_attrs_size(act); | |
180 | ||
181 | if (act->ops->get_fill_size) | |
182 | return act->ops->get_fill_size(act) + sz; | |
183 | return sz; | |
184 | } | |
185 | ||
65a206c0 | 186 | static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb, |
a85a970a | 187 | struct netlink_callback *cb) |
e9ce1cd3 | 188 | { |
65a206c0 | 189 | int err = 0, index = -1, s_i = 0, n_i = 0; |
90825b23 | 190 | u32 act_flags = cb->args[2]; |
e62e484d | 191 | unsigned long jiffy_since = cb->args[3]; |
4b3550ef | 192 | struct nlattr *nest; |
65a206c0 CM |
193 | struct idr *idr = &idrinfo->action_idr; |
194 | struct tc_action *p; | |
195 | unsigned long id = 1; | |
e9ce1cd3 | 196 | |
290aa0ad | 197 | spin_lock(&idrinfo->lock); |
e9ce1cd3 DM |
198 | |
199 | s_i = cb->args[0]; | |
200 | ||
7a457577 | 201 | idr_for_each_entry_ul(idr, p, id) { |
65a206c0 CM |
202 | index++; |
203 | if (index < s_i) | |
204 | continue; | |
205 | ||
206 | if (jiffy_since && | |
207 | time_after(jiffy_since, | |
208 | (unsigned long)p->tcfa_tm.lastuse)) | |
209 | continue; | |
210 | ||
211 | nest = nla_nest_start(skb, n_i); | |
734549eb CD |
212 | if (!nest) { |
213 | index--; | |
65a206c0 | 214 | goto nla_put_failure; |
734549eb | 215 | } |
65a206c0 CM |
216 | err = tcf_action_dump_1(skb, p, 0, 0); |
217 | if (err < 0) { | |
218 | index--; | |
219 | nlmsg_trim(skb, nest); | |
220 | goto done; | |
e9ce1cd3 | 221 | } |
65a206c0 CM |
222 | nla_nest_end(skb, nest); |
223 | n_i++; | |
224 | if (!(act_flags & TCA_FLAG_LARGE_DUMP_ON) && | |
225 | n_i >= TCA_ACT_MAX_PRIO) | |
226 | goto done; | |
e9ce1cd3 DM |
227 | } |
228 | done: | |
e62e484d JHS |
229 | if (index >= 0) |
230 | cb->args[0] = index + 1; | |
231 | ||
290aa0ad | 232 | spin_unlock(&idrinfo->lock); |
90825b23 | 233 | if (n_i) { |
90825b23 JHS |
234 | if (act_flags & TCA_FLAG_LARGE_DUMP_ON) |
235 | cb->args[1] = n_i; | |
236 | } | |
e9ce1cd3 DM |
237 | return n_i; |
238 | ||
7ba699c6 | 239 | nla_put_failure: |
4b3550ef | 240 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
241 | goto done; |
242 | } | |
243 | ||
65a206c0 | 244 | static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb, |
a85a970a | 245 | const struct tc_action_ops *ops) |
e9ce1cd3 | 246 | { |
4b3550ef | 247 | struct nlattr *nest; |
65a206c0 | 248 | int n_i = 0; |
55334a5d | 249 | int ret = -EINVAL; |
65a206c0 CM |
250 | struct idr *idr = &idrinfo->action_idr; |
251 | struct tc_action *p; | |
252 | unsigned long id = 1; | |
e9ce1cd3 | 253 | |
a85a970a | 254 | nest = nla_nest_start(skb, 0); |
4b3550ef PM |
255 | if (nest == NULL) |
256 | goto nla_put_failure; | |
a85a970a | 257 | if (nla_put_string(skb, TCA_KIND, ops->kind)) |
1b34ec43 | 258 | goto nla_put_failure; |
65a206c0 | 259 | |
7a457577 | 260 | idr_for_each_entry_ul(idr, p, id) { |
65a206c0 CM |
261 | ret = __tcf_idr_release(p, false, true); |
262 | if (ret == ACT_P_DELETED) { | |
255cd50f | 263 | module_put(ops->owner); |
65a206c0 CM |
264 | n_i++; |
265 | } else if (ret < 0) { | |
266 | goto nla_put_failure; | |
e9ce1cd3 DM |
267 | } |
268 | } | |
1b34ec43 DM |
269 | if (nla_put_u32(skb, TCA_FCNT, n_i)) |
270 | goto nla_put_failure; | |
4b3550ef | 271 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
272 | |
273 | return n_i; | |
7ba699c6 | 274 | nla_put_failure: |
4b3550ef | 275 | nla_nest_cancel(skb, nest); |
55334a5d | 276 | return ret; |
e9ce1cd3 DM |
277 | } |
278 | ||
ddf97ccd WC |
279 | int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, |
280 | struct netlink_callback *cb, int type, | |
b3620145 AA |
281 | const struct tc_action_ops *ops, |
282 | struct netlink_ext_ack *extack) | |
e9ce1cd3 | 283 | { |
65a206c0 | 284 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
ddf97ccd | 285 | |
e9ce1cd3 | 286 | if (type == RTM_DELACTION) { |
65a206c0 | 287 | return tcf_del_walker(idrinfo, skb, ops); |
e9ce1cd3 | 288 | } else if (type == RTM_GETACTION) { |
65a206c0 | 289 | return tcf_dump_walker(idrinfo, skb, cb); |
e9ce1cd3 | 290 | } else { |
b3620145 AA |
291 | WARN(1, "tcf_generic_walker: unknown command %d\n", type); |
292 | NL_SET_ERR_MSG(extack, "tcf_generic_walker: unknown command"); | |
e9ce1cd3 DM |
293 | return -EINVAL; |
294 | } | |
295 | } | |
ddf97ccd | 296 | EXPORT_SYMBOL(tcf_generic_walker); |
e9ce1cd3 | 297 | |
3f7c72bc VB |
298 | static bool __tcf_idr_check(struct tc_action_net *tn, u32 index, |
299 | struct tc_action **a, int bind) | |
e9ce1cd3 | 300 | { |
3f7c72bc VB |
301 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
302 | struct tc_action *p; | |
e9ce1cd3 | 303 | |
290aa0ad | 304 | spin_lock(&idrinfo->lock); |
322d884b | 305 | p = idr_find(&idrinfo->action_idr, index); |
0190c1d4 VB |
306 | if (IS_ERR(p)) { |
307 | p = NULL; | |
308 | } else if (p) { | |
3f7c72bc VB |
309 | refcount_inc(&p->tcfa_refcnt); |
310 | if (bind) | |
311 | atomic_inc(&p->tcfa_bindcnt); | |
312 | } | |
290aa0ad | 313 | spin_unlock(&idrinfo->lock); |
e9ce1cd3 | 314 | |
3f7c72bc VB |
315 | if (p) { |
316 | *a = p; | |
317 | return true; | |
318 | } | |
319 | return false; | |
e9ce1cd3 | 320 | } |
e9ce1cd3 | 321 | |
65a206c0 | 322 | int tcf_idr_search(struct tc_action_net *tn, struct tc_action **a, u32 index) |
e9ce1cd3 | 323 | { |
3f7c72bc | 324 | return __tcf_idr_check(tn, index, a, 0); |
e9ce1cd3 | 325 | } |
65a206c0 | 326 | EXPORT_SYMBOL(tcf_idr_search); |
e9ce1cd3 | 327 | |
65a206c0 CM |
328 | bool tcf_idr_check(struct tc_action_net *tn, u32 index, struct tc_action **a, |
329 | int bind) | |
e9ce1cd3 | 330 | { |
3f7c72bc | 331 | return __tcf_idr_check(tn, index, a, bind); |
e9ce1cd3 | 332 | } |
65a206c0 | 333 | EXPORT_SYMBOL(tcf_idr_check); |
e9ce1cd3 | 334 | |
2a2ea349 VB |
335 | int tcf_idr_delete_index(struct tc_action_net *tn, u32 index) |
336 | { | |
337 | struct tcf_idrinfo *idrinfo = tn->idrinfo; | |
338 | struct tc_action *p; | |
339 | int ret = 0; | |
340 | ||
341 | spin_lock(&idrinfo->lock); | |
342 | p = idr_find(&idrinfo->action_idr, index); | |
343 | if (!p) { | |
344 | spin_unlock(&idrinfo->lock); | |
345 | return -ENOENT; | |
346 | } | |
347 | ||
348 | if (!atomic_read(&p->tcfa_bindcnt)) { | |
349 | if (refcount_dec_and_test(&p->tcfa_refcnt)) { | |
350 | struct module *owner = p->ops->owner; | |
351 | ||
352 | WARN_ON(p != idr_remove(&idrinfo->action_idr, | |
353 | p->tcfa_index)); | |
354 | spin_unlock(&idrinfo->lock); | |
355 | ||
16af6067 | 356 | tcf_action_cleanup(p); |
2a2ea349 VB |
357 | module_put(owner); |
358 | return 0; | |
359 | } | |
360 | ret = 0; | |
361 | } else { | |
362 | ret = -EPERM; | |
363 | } | |
364 | ||
365 | spin_unlock(&idrinfo->lock); | |
366 | return ret; | |
367 | } | |
368 | EXPORT_SYMBOL(tcf_idr_delete_index); | |
369 | ||
65a206c0 CM |
370 | int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est, |
371 | struct tc_action **a, const struct tc_action_ops *ops, | |
372 | int bind, bool cpustats) | |
e9ce1cd3 | 373 | { |
ec0595cc | 374 | struct tc_action *p = kzalloc(ops->size, GFP_KERNEL); |
65a206c0 | 375 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
519c818e | 376 | int err = -ENOMEM; |
e9ce1cd3 DM |
377 | |
378 | if (unlikely(!p)) | |
86062033 | 379 | return -ENOMEM; |
036bb443 | 380 | refcount_set(&p->tcfa_refcnt, 1); |
e9ce1cd3 | 381 | if (bind) |
036bb443 | 382 | atomic_set(&p->tcfa_bindcnt, 1); |
e9ce1cd3 | 383 | |
519c818e ED |
384 | if (cpustats) { |
385 | p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); | |
339913a8 | 386 | if (!p->cpu_bstats) |
519c818e | 387 | goto err1; |
339913a8 MW |
388 | p->cpu_qstats = alloc_percpu(struct gnet_stats_queue); |
389 | if (!p->cpu_qstats) | |
390 | goto err2; | |
519c818e | 391 | } |
ec0595cc | 392 | spin_lock_init(&p->tcfa_lock); |
339913a8 | 393 | p->tcfa_index = index; |
ec0595cc WC |
394 | p->tcfa_tm.install = jiffies; |
395 | p->tcfa_tm.lastuse = jiffies; | |
396 | p->tcfa_tm.firstuse = 0; | |
0e991ec6 | 397 | if (est) { |
ec0595cc WC |
398 | err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats, |
399 | &p->tcfa_rate_est, | |
400 | &p->tcfa_lock, NULL, est); | |
339913a8 | 401 | if (err) |
0190c1d4 | 402 | goto err3; |
0e991ec6 SH |
403 | } |
404 | ||
65a206c0 | 405 | p->idrinfo = idrinfo; |
ec0595cc WC |
406 | p->ops = ops; |
407 | INIT_LIST_HEAD(&p->list); | |
408 | *a = p; | |
86062033 | 409 | return 0; |
339913a8 MW |
410 | err3: |
411 | free_percpu(p->cpu_qstats); | |
412 | err2: | |
413 | free_percpu(p->cpu_bstats); | |
414 | err1: | |
415 | kfree(p); | |
416 | return err; | |
e9ce1cd3 | 417 | } |
65a206c0 | 418 | EXPORT_SYMBOL(tcf_idr_create); |
e9ce1cd3 | 419 | |
65a206c0 | 420 | void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a) |
e9ce1cd3 | 421 | { |
65a206c0 | 422 | struct tcf_idrinfo *idrinfo = tn->idrinfo; |
e9ce1cd3 | 423 | |
290aa0ad | 424 | spin_lock(&idrinfo->lock); |
0190c1d4 VB |
425 | /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */ |
426 | WARN_ON(!IS_ERR(idr_replace(&idrinfo->action_idr, a, a->tcfa_index))); | |
290aa0ad | 427 | spin_unlock(&idrinfo->lock); |
e9ce1cd3 | 428 | } |
65a206c0 | 429 | EXPORT_SYMBOL(tcf_idr_insert); |
1da177e4 | 430 | |
0190c1d4 VB |
431 | /* Cleanup idr index that was allocated but not initialized. */ |
432 | ||
433 | void tcf_idr_cleanup(struct tc_action_net *tn, u32 index) | |
434 | { | |
435 | struct tcf_idrinfo *idrinfo = tn->idrinfo; | |
436 | ||
437 | spin_lock(&idrinfo->lock); | |
438 | /* Remove ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */ | |
439 | WARN_ON(!IS_ERR(idr_remove(&idrinfo->action_idr, index))); | |
440 | spin_unlock(&idrinfo->lock); | |
441 | } | |
442 | EXPORT_SYMBOL(tcf_idr_cleanup); | |
443 | ||
444 | /* Check if action with specified index exists. If actions is found, increments | |
445 | * its reference and bind counters, and return 1. Otherwise insert temporary | |
446 | * error pointer (to prevent concurrent users from inserting actions with same | |
447 | * index) and return 0. | |
448 | */ | |
449 | ||
450 | int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, | |
451 | struct tc_action **a, int bind) | |
452 | { | |
453 | struct tcf_idrinfo *idrinfo = tn->idrinfo; | |
454 | struct tc_action *p; | |
455 | int ret; | |
456 | ||
457 | again: | |
458 | spin_lock(&idrinfo->lock); | |
459 | if (*index) { | |
460 | p = idr_find(&idrinfo->action_idr, *index); | |
461 | if (IS_ERR(p)) { | |
462 | /* This means that another process allocated | |
463 | * index but did not assign the pointer yet. | |
464 | */ | |
465 | spin_unlock(&idrinfo->lock); | |
466 | goto again; | |
467 | } | |
468 | ||
469 | if (p) { | |
470 | refcount_inc(&p->tcfa_refcnt); | |
471 | if (bind) | |
472 | atomic_inc(&p->tcfa_bindcnt); | |
473 | *a = p; | |
474 | ret = 1; | |
475 | } else { | |
476 | *a = NULL; | |
477 | ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index, | |
478 | *index, GFP_ATOMIC); | |
479 | if (!ret) | |
480 | idr_replace(&idrinfo->action_idr, | |
481 | ERR_PTR(-EBUSY), *index); | |
482 | } | |
483 | } else { | |
484 | *index = 1; | |
485 | *a = NULL; | |
486 | ret = idr_alloc_u32(&idrinfo->action_idr, NULL, index, | |
487 | UINT_MAX, GFP_ATOMIC); | |
488 | if (!ret) | |
489 | idr_replace(&idrinfo->action_idr, ERR_PTR(-EBUSY), | |
490 | *index); | |
491 | } | |
492 | spin_unlock(&idrinfo->lock); | |
493 | return ret; | |
494 | } | |
495 | EXPORT_SYMBOL(tcf_idr_check_alloc); | |
496 | ||
65a206c0 CM |
497 | void tcf_idrinfo_destroy(const struct tc_action_ops *ops, |
498 | struct tcf_idrinfo *idrinfo) | |
1d4150c0 | 499 | { |
65a206c0 CM |
500 | struct idr *idr = &idrinfo->action_idr; |
501 | struct tc_action *p; | |
502 | int ret; | |
503 | unsigned long id = 1; | |
1d4150c0 | 504 | |
7a457577 | 505 | idr_for_each_entry_ul(idr, p, id) { |
65a206c0 CM |
506 | ret = __tcf_idr_release(p, false, true); |
507 | if (ret == ACT_P_DELETED) | |
508 | module_put(ops->owner); | |
509 | else if (ret < 0) | |
510 | return; | |
1d4150c0 | 511 | } |
65a206c0 | 512 | idr_destroy(&idrinfo->action_idr); |
1d4150c0 | 513 | } |
65a206c0 | 514 | EXPORT_SYMBOL(tcf_idrinfo_destroy); |
1d4150c0 | 515 | |
1f747c26 | 516 | static LIST_HEAD(act_base); |
1da177e4 LT |
517 | static DEFINE_RWLOCK(act_mod_lock); |
518 | ||
ddf97ccd WC |
519 | int tcf_register_action(struct tc_action_ops *act, |
520 | struct pernet_operations *ops) | |
1da177e4 | 521 | { |
1f747c26 | 522 | struct tc_action_ops *a; |
ddf97ccd | 523 | int ret; |
1da177e4 | 524 | |
ddf97ccd | 525 | if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup) |
76c82d7a JHS |
526 | return -EINVAL; |
527 | ||
ab102b80 WC |
528 | /* We have to register pernet ops before making the action ops visible, |
529 | * otherwise tcf_action_init_1() could get a partially initialized | |
530 | * netns. | |
531 | */ | |
532 | ret = register_pernet_subsys(ops); | |
533 | if (ret) | |
534 | return ret; | |
535 | ||
1da177e4 | 536 | write_lock(&act_mod_lock); |
1f747c26 | 537 | list_for_each_entry(a, &act_base, head) { |
1da177e4 LT |
538 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { |
539 | write_unlock(&act_mod_lock); | |
ab102b80 | 540 | unregister_pernet_subsys(ops); |
1da177e4 LT |
541 | return -EEXIST; |
542 | } | |
543 | } | |
1f747c26 | 544 | list_add_tail(&act->head, &act_base); |
1da177e4 | 545 | write_unlock(&act_mod_lock); |
ddf97ccd | 546 | |
1da177e4 LT |
547 | return 0; |
548 | } | |
62e3ba1b | 549 | EXPORT_SYMBOL(tcf_register_action); |
1da177e4 | 550 | |
ddf97ccd WC |
551 | int tcf_unregister_action(struct tc_action_ops *act, |
552 | struct pernet_operations *ops) | |
1da177e4 | 553 | { |
1f747c26 | 554 | struct tc_action_ops *a; |
1da177e4 LT |
555 | int err = -ENOENT; |
556 | ||
557 | write_lock(&act_mod_lock); | |
a792866a ED |
558 | list_for_each_entry(a, &act_base, head) { |
559 | if (a == act) { | |
560 | list_del(&act->head); | |
561 | err = 0; | |
1da177e4 | 562 | break; |
a792866a | 563 | } |
1da177e4 LT |
564 | } |
565 | write_unlock(&act_mod_lock); | |
ab102b80 WC |
566 | if (!err) |
567 | unregister_pernet_subsys(ops); | |
1da177e4 LT |
568 | return err; |
569 | } | |
62e3ba1b | 570 | EXPORT_SYMBOL(tcf_unregister_action); |
1da177e4 LT |
571 | |
572 | /* lookup by name */ | |
573 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
574 | { | |
a792866a | 575 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
576 | |
577 | if (kind) { | |
578 | read_lock(&act_mod_lock); | |
1f747c26 | 579 | list_for_each_entry(a, &act_base, head) { |
1da177e4 | 580 | if (strcmp(kind, a->kind) == 0) { |
a792866a ED |
581 | if (try_module_get(a->owner)) |
582 | res = a; | |
1da177e4 LT |
583 | break; |
584 | } | |
585 | } | |
586 | read_unlock(&act_mod_lock); | |
587 | } | |
a792866a | 588 | return res; |
1da177e4 LT |
589 | } |
590 | ||
7ba699c6 PM |
591 | /* lookup by nlattr */ |
592 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) | |
1da177e4 | 593 | { |
a792866a | 594 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
595 | |
596 | if (kind) { | |
597 | read_lock(&act_mod_lock); | |
1f747c26 | 598 | list_for_each_entry(a, &act_base, head) { |
7ba699c6 | 599 | if (nla_strcmp(kind, a->kind) == 0) { |
a792866a ED |
600 | if (try_module_get(a->owner)) |
601 | res = a; | |
1da177e4 LT |
602 | break; |
603 | } | |
604 | } | |
605 | read_unlock(&act_mod_lock); | |
606 | } | |
a792866a | 607 | return res; |
1da177e4 | 608 | } |
1da177e4 | 609 | |
e0ee84de JHS |
610 | /*TCA_ACT_MAX_PRIO is 32, there count upto 32 */ |
611 | #define TCA_ACT_MAX_PRIO_MASK 0x1FF | |
22dc13c8 WC |
612 | int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, |
613 | int nr_actions, struct tcf_result *res) | |
1da177e4 | 614 | { |
e0ee84de JHS |
615 | u32 jmp_prgcnt = 0; |
616 | u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */ | |
ec1a9cca JP |
617 | int i; |
618 | int ret = TC_ACT_OK; | |
1da177e4 | 619 | |
e7246e12 WB |
620 | if (skb_skip_tc_classify(skb)) |
621 | return TC_ACT_OK; | |
622 | ||
e0ee84de | 623 | restart_act_graph: |
22dc13c8 WC |
624 | for (i = 0; i < nr_actions; i++) { |
625 | const struct tc_action *a = actions[i]; | |
626 | ||
e0ee84de JHS |
627 | if (jmp_prgcnt > 0) { |
628 | jmp_prgcnt -= 1; | |
629 | continue; | |
630 | } | |
1da177e4 | 631 | repeat: |
63acd680 | 632 | ret = a->ops->act(skb, a, res); |
63acd680 JHS |
633 | if (ret == TC_ACT_REPEAT) |
634 | goto repeat; /* we need a ttl - JHS */ | |
e0ee84de | 635 | |
9da3242e | 636 | if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) { |
e0ee84de JHS |
637 | jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK; |
638 | if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) { | |
639 | /* faulty opcode, stop pipeline */ | |
640 | return TC_ACT_OK; | |
641 | } else { | |
642 | jmp_ttl -= 1; | |
643 | if (jmp_ttl > 0) | |
644 | goto restart_act_graph; | |
645 | else /* faulty graph, stop pipeline */ | |
646 | return TC_ACT_OK; | |
647 | } | |
db50514f JP |
648 | } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) { |
649 | tcf_action_goto_chain_exec(a, res); | |
e0ee84de JHS |
650 | } |
651 | ||
63acd680 | 652 | if (ret != TC_ACT_PIPE) |
e7246e12 | 653 | break; |
1da177e4 | 654 | } |
e0ee84de | 655 | |
1da177e4 LT |
656 | return ret; |
657 | } | |
62e3ba1b | 658 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 | 659 | |
55334a5d | 660 | int tcf_action_destroy(struct list_head *actions, int bind) |
1da177e4 | 661 | { |
255cd50f | 662 | const struct tc_action_ops *ops; |
33be6271 | 663 | struct tc_action *a, *tmp; |
55334a5d | 664 | int ret = 0; |
1da177e4 | 665 | |
33be6271 | 666 | list_for_each_entry_safe(a, tmp, actions, list) { |
255cd50f | 667 | ops = a->ops; |
65a206c0 | 668 | ret = __tcf_idr_release(a, bind, true); |
55334a5d | 669 | if (ret == ACT_P_DELETED) |
255cd50f | 670 | module_put(ops->owner); |
55334a5d WC |
671 | else if (ret < 0) |
672 | return ret; | |
1da177e4 | 673 | } |
55334a5d | 674 | return ret; |
1da177e4 LT |
675 | } |
676 | ||
16af6067 VB |
677 | static int tcf_action_put(struct tc_action *p) |
678 | { | |
679 | return __tcf_action_put(p, false); | |
680 | } | |
681 | ||
cae422f3 VB |
682 | static void tcf_action_put_lst(struct list_head *actions) |
683 | { | |
684 | struct tc_action *a, *tmp; | |
685 | ||
686 | list_for_each_entry_safe(a, tmp, actions, list) { | |
687 | const struct tc_action_ops *ops = a->ops; | |
688 | ||
689 | if (tcf_action_put(a)) | |
690 | module_put(ops->owner); | |
691 | } | |
692 | } | |
693 | ||
1da177e4 LT |
694 | int |
695 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
696 | { | |
1da177e4 LT |
697 | return a->ops->dump(skb, a, bind, ref); |
698 | } | |
699 | ||
700 | int | |
701 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
702 | { | |
703 | int err = -EINVAL; | |
27a884dc | 704 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 705 | struct nlattr *nest; |
eec94fdb | 706 | struct tc_cookie *cookie; |
1da177e4 | 707 | |
1b34ec43 DM |
708 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) |
709 | goto nla_put_failure; | |
1da177e4 | 710 | if (tcf_action_copy_stats(skb, a, 0)) |
7ba699c6 | 711 | goto nla_put_failure; |
eec94fdb VB |
712 | |
713 | rcu_read_lock(); | |
714 | cookie = rcu_dereference(a->act_cookie); | |
715 | if (cookie) { | |
716 | if (nla_put(skb, TCA_ACT_COOKIE, cookie->len, cookie->data)) { | |
717 | rcu_read_unlock(); | |
1045ba77 | 718 | goto nla_put_failure; |
eec94fdb | 719 | } |
1045ba77 | 720 | } |
eec94fdb | 721 | rcu_read_unlock(); |
1045ba77 | 722 | |
4b3550ef PM |
723 | nest = nla_nest_start(skb, TCA_OPTIONS); |
724 | if (nest == NULL) | |
725 | goto nla_put_failure; | |
cc7ec456 ED |
726 | err = tcf_action_dump_old(skb, a, bind, ref); |
727 | if (err > 0) { | |
4b3550ef | 728 | nla_nest_end(skb, nest); |
1da177e4 LT |
729 | return err; |
730 | } | |
731 | ||
7ba699c6 | 732 | nla_put_failure: |
dc5fc579 | 733 | nlmsg_trim(skb, b); |
1da177e4 LT |
734 | return -1; |
735 | } | |
62e3ba1b | 736 | EXPORT_SYMBOL(tcf_action_dump_1); |
1da177e4 | 737 | |
0b0f43fe JHS |
738 | int tcf_action_dump(struct sk_buff *skb, struct list_head *actions, |
739 | int bind, int ref) | |
1da177e4 LT |
740 | { |
741 | struct tc_action *a; | |
742 | int err = -EINVAL; | |
4b3550ef | 743 | struct nlattr *nest; |
1da177e4 | 744 | |
33be6271 | 745 | list_for_each_entry(a, actions, list) { |
4b3550ef PM |
746 | nest = nla_nest_start(skb, a->order); |
747 | if (nest == NULL) | |
748 | goto nla_put_failure; | |
1da177e4 LT |
749 | err = tcf_action_dump_1(skb, a, bind, ref); |
750 | if (err < 0) | |
4fe683f5 | 751 | goto errout; |
4b3550ef | 752 | nla_nest_end(skb, nest); |
1da177e4 LT |
753 | } |
754 | ||
755 | return 0; | |
756 | ||
7ba699c6 | 757 | nla_put_failure: |
4fe683f5 TG |
758 | err = -EINVAL; |
759 | errout: | |
4b3550ef | 760 | nla_nest_cancel(skb, nest); |
4fe683f5 | 761 | return err; |
1da177e4 LT |
762 | } |
763 | ||
e0535ce5 | 764 | static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb) |
1045ba77 | 765 | { |
e0535ce5 WB |
766 | struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL); |
767 | if (!c) | |
768 | return NULL; | |
769 | ||
770 | c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL); | |
771 | if (!c->data) { | |
772 | kfree(c); | |
773 | return NULL; | |
1045ba77 | 774 | } |
e0535ce5 | 775 | c->len = nla_len(tb[TCA_ACT_COOKIE]); |
1045ba77 | 776 | |
e0535ce5 | 777 | return c; |
1045ba77 JHS |
778 | } |
779 | ||
9fb9f251 JP |
780 | struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, |
781 | struct nlattr *nla, struct nlattr *est, | |
aea0d727 | 782 | char *name, int ovr, int bind, |
789871bb | 783 | bool rtnl_held, |
aea0d727 | 784 | struct netlink_ext_ack *extack) |
1da177e4 LT |
785 | { |
786 | struct tc_action *a; | |
787 | struct tc_action_ops *a_o; | |
e0535ce5 | 788 | struct tc_cookie *cookie = NULL; |
1da177e4 | 789 | char act_name[IFNAMSIZ]; |
cc7ec456 | 790 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 791 | struct nlattr *kind; |
ab27cfb8 | 792 | int err; |
1da177e4 | 793 | |
1da177e4 | 794 | if (name == NULL) { |
84ae017a | 795 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack); |
cee63723 | 796 | if (err < 0) |
1da177e4 | 797 | goto err_out; |
cee63723 | 798 | err = -EINVAL; |
7ba699c6 | 799 | kind = tb[TCA_ACT_KIND]; |
84ae017a AA |
800 | if (!kind) { |
801 | NL_SET_ERR_MSG(extack, "TC action kind must be specified"); | |
1da177e4 | 802 | goto err_out; |
84ae017a AA |
803 | } |
804 | if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) { | |
805 | NL_SET_ERR_MSG(extack, "TC action name too long"); | |
1da177e4 | 806 | goto err_out; |
84ae017a | 807 | } |
e0535ce5 WB |
808 | if (tb[TCA_ACT_COOKIE]) { |
809 | int cklen = nla_len(tb[TCA_ACT_COOKIE]); | |
810 | ||
84ae017a AA |
811 | if (cklen > TC_COOKIE_MAX_SIZE) { |
812 | NL_SET_ERR_MSG(extack, "TC cookie size above the maximum"); | |
e0535ce5 | 813 | goto err_out; |
84ae017a | 814 | } |
e0535ce5 WB |
815 | |
816 | cookie = nla_memdup_cookie(tb); | |
817 | if (!cookie) { | |
84ae017a | 818 | NL_SET_ERR_MSG(extack, "No memory to generate TC cookie"); |
e0535ce5 WB |
819 | err = -ENOMEM; |
820 | goto err_out; | |
821 | } | |
822 | } | |
1da177e4 | 823 | } else { |
84ae017a AA |
824 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) { |
825 | NL_SET_ERR_MSG(extack, "TC action name too long"); | |
826 | err = -EINVAL; | |
1da177e4 | 827 | goto err_out; |
84ae017a | 828 | } |
1da177e4 LT |
829 | } |
830 | ||
831 | a_o = tc_lookup_action_n(act_name); | |
832 | if (a_o == NULL) { | |
95a5afca | 833 | #ifdef CONFIG_MODULES |
789871bb VB |
834 | if (rtnl_held) |
835 | rtnl_unlock(); | |
4bba3925 | 836 | request_module("act_%s", act_name); |
789871bb VB |
837 | if (rtnl_held) |
838 | rtnl_lock(); | |
1da177e4 LT |
839 | |
840 | a_o = tc_lookup_action_n(act_name); | |
841 | ||
842 | /* We dropped the RTNL semaphore in order to | |
843 | * perform the module load. So, even if we | |
844 | * succeeded in loading the module we have to | |
845 | * tell the caller to replay the request. We | |
846 | * indicate this using -EAGAIN. | |
847 | */ | |
848 | if (a_o != NULL) { | |
ab27cfb8 | 849 | err = -EAGAIN; |
1da177e4 LT |
850 | goto err_mod; |
851 | } | |
852 | #endif | |
84ae017a | 853 | NL_SET_ERR_MSG(extack, "Failed to load TC action module"); |
ab27cfb8 | 854 | err = -ENOENT; |
1da177e4 LT |
855 | goto err_out; |
856 | } | |
857 | ||
1da177e4 LT |
858 | /* backward compatibility for policer */ |
859 | if (name == NULL) | |
589dad6d | 860 | err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind, |
789871bb | 861 | rtnl_held, extack); |
1da177e4 | 862 | else |
789871bb VB |
863 | err = a_o->init(net, nla, est, &a, ovr, bind, rtnl_held, |
864 | extack); | |
ab27cfb8 | 865 | if (err < 0) |
a85a970a | 866 | goto err_mod; |
1da177e4 | 867 | |
eec94fdb VB |
868 | if (!name && tb[TCA_ACT_COOKIE]) |
869 | tcf_set_action_cookie(&a->act_cookie, cookie); | |
1045ba77 | 870 | |
1da177e4 | 871 | /* module count goes up only when brand new policy is created |
cc7ec456 ED |
872 | * if it exists and is only bound to in a_o->init() then |
873 | * ACT_P_CREATED is not returned (a zero is). | |
874 | */ | |
ab27cfb8 | 875 | if (err != ACT_P_CREATED) |
1da177e4 | 876 | module_put(a_o->owner); |
1da177e4 | 877 | |
db50514f JP |
878 | if (TC_ACT_EXT_CMP(a->tcfa_action, TC_ACT_GOTO_CHAIN)) { |
879 | err = tcf_action_goto_chain_init(a, tp); | |
880 | if (err) { | |
881 | LIST_HEAD(actions); | |
882 | ||
883 | list_add_tail(&a->list, &actions); | |
884 | tcf_action_destroy(&actions, bind); | |
84ae017a | 885 | NL_SET_ERR_MSG(extack, "Failed to init TC action chain"); |
db50514f JP |
886 | return ERR_PTR(err); |
887 | } | |
888 | } | |
889 | ||
1da177e4 LT |
890 | return a; |
891 | ||
1da177e4 LT |
892 | err_mod: |
893 | module_put(a_o->owner); | |
894 | err_out: | |
e0535ce5 WB |
895 | if (cookie) { |
896 | kfree(cookie->data); | |
897 | kfree(cookie); | |
898 | } | |
ab27cfb8 | 899 | return ERR_PTR(err); |
1da177e4 LT |
900 | } |
901 | ||
9fb9f251 JP |
902 | int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, |
903 | struct nlattr *est, char *name, int ovr, int bind, | |
d04e6990 | 904 | struct list_head *actions, size_t *attr_size, |
789871bb | 905 | bool rtnl_held, struct netlink_ext_ack *extack) |
1da177e4 | 906 | { |
cc7ec456 | 907 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 | 908 | struct tc_action *act; |
4e76e75d | 909 | size_t sz = 0; |
cee63723 | 910 | int err; |
1da177e4 LT |
911 | int i; |
912 | ||
84ae017a | 913 | err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, extack); |
cee63723 | 914 | if (err < 0) |
33be6271 | 915 | return err; |
1da177e4 | 916 | |
7ba699c6 | 917 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
aea0d727 | 918 | act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind, |
789871bb | 919 | rtnl_held, extack); |
33be6271 WC |
920 | if (IS_ERR(act)) { |
921 | err = PTR_ERR(act); | |
1da177e4 | 922 | goto err; |
33be6271 | 923 | } |
7ba699c6 | 924 | act->order = i; |
4e76e75d | 925 | sz += tcf_action_fill_size(act); |
33be6271 | 926 | list_add_tail(&act->list, actions); |
1da177e4 | 927 | } |
aecc5cef | 928 | |
4e76e75d | 929 | *attr_size = tcf_action_full_attrs_size(sz); |
33be6271 | 930 | return 0; |
1da177e4 LT |
931 | |
932 | err: | |
33be6271 WC |
933 | tcf_action_destroy(actions, bind); |
934 | return err; | |
1da177e4 LT |
935 | } |
936 | ||
ec0595cc | 937 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p, |
1da177e4 LT |
938 | int compat_mode) |
939 | { | |
940 | int err = 0; | |
941 | struct gnet_dump d; | |
10297b99 | 942 | |
7eb8896d | 943 | if (p == NULL) |
1da177e4 LT |
944 | goto errout; |
945 | ||
946 | /* compat_mode being true specifies a call that is supposed | |
06fe9fb4 | 947 | * to add additional backward compatibility statistic TLVs. |
1da177e4 LT |
948 | */ |
949 | if (compat_mode) { | |
ec0595cc | 950 | if (p->type == TCA_OLD_COMPAT) |
1da177e4 | 951 | err = gnet_stats_start_copy_compat(skb, 0, |
9854518e ND |
952 | TCA_STATS, |
953 | TCA_XSTATS, | |
ec0595cc | 954 | &p->tcfa_lock, &d, |
9854518e | 955 | TCA_PAD); |
1da177e4 LT |
956 | else |
957 | return 0; | |
958 | } else | |
959 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
ec0595cc | 960 | &p->tcfa_lock, &d, TCA_ACT_PAD); |
1da177e4 LT |
961 | |
962 | if (err < 0) | |
963 | goto errout; | |
964 | ||
ec0595cc | 965 | if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 || |
1c0d32fd | 966 | gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 || |
519c818e | 967 | gnet_stats_copy_queue(&d, p->cpu_qstats, |
ec0595cc WC |
968 | &p->tcfa_qstats, |
969 | p->tcfa_qstats.qlen) < 0) | |
1da177e4 LT |
970 | goto errout; |
971 | ||
972 | if (gnet_stats_finish_copy(&d) < 0) | |
973 | goto errout; | |
974 | ||
975 | return 0; | |
976 | ||
977 | errout: | |
978 | return -1; | |
979 | } | |
980 | ||
0b0f43fe JHS |
981 | static int tca_get_fill(struct sk_buff *skb, struct list_head *actions, |
982 | u32 portid, u32 seq, u16 flags, int event, int bind, | |
983 | int ref) | |
1da177e4 LT |
984 | { |
985 | struct tcamsg *t; | |
986 | struct nlmsghdr *nlh; | |
27a884dc | 987 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 988 | struct nlattr *nest; |
1da177e4 | 989 | |
15e47304 | 990 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags); |
8b00a53c DM |
991 | if (!nlh) |
992 | goto out_nlmsg_trim; | |
993 | t = nlmsg_data(nlh); | |
1da177e4 | 994 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
995 | t->tca__pad1 = 0; |
996 | t->tca__pad2 = 0; | |
10297b99 | 997 | |
4b3550ef | 998 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
1af85155 | 999 | if (!nest) |
8b00a53c | 1000 | goto out_nlmsg_trim; |
1da177e4 | 1001 | |
33be6271 | 1002 | if (tcf_action_dump(skb, actions, bind, ref) < 0) |
8b00a53c | 1003 | goto out_nlmsg_trim; |
1da177e4 | 1004 | |
4b3550ef | 1005 | nla_nest_end(skb, nest); |
10297b99 | 1006 | |
27a884dc | 1007 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1008 | return skb->len; |
1009 | ||
8b00a53c | 1010 | out_nlmsg_trim: |
dc5fc579 | 1011 | nlmsg_trim(skb, b); |
1da177e4 LT |
1012 | return -1; |
1013 | } | |
1014 | ||
1015 | static int | |
c4c4290c | 1016 | tcf_get_notify(struct net *net, u32 portid, struct nlmsghdr *n, |
84ae017a AA |
1017 | struct list_head *actions, int event, |
1018 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
1019 | { |
1020 | struct sk_buff *skb; | |
1da177e4 LT |
1021 | |
1022 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1023 | if (!skb) | |
1024 | return -ENOBUFS; | |
0b0f43fe | 1025 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, |
3f7c72bc | 1026 | 0, 1) <= 0) { |
84ae017a | 1027 | NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action"); |
1da177e4 LT |
1028 | kfree_skb(skb); |
1029 | return -EINVAL; | |
1030 | } | |
2942e900 | 1031 | |
15e47304 | 1032 | return rtnl_unicast(skb, net, portid); |
1da177e4 LT |
1033 | } |
1034 | ||
ddf97ccd | 1035 | static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla, |
84ae017a AA |
1036 | struct nlmsghdr *n, u32 portid, |
1037 | struct netlink_ext_ack *extack) | |
1da177e4 | 1038 | { |
cc7ec456 | 1039 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
a85a970a | 1040 | const struct tc_action_ops *ops; |
1da177e4 LT |
1041 | struct tc_action *a; |
1042 | int index; | |
ab27cfb8 | 1043 | int err; |
1da177e4 | 1044 | |
84ae017a | 1045 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack); |
cee63723 | 1046 | if (err < 0) |
ab27cfb8 | 1047 | goto err_out; |
1da177e4 | 1048 | |
cee63723 | 1049 | err = -EINVAL; |
7ba699c6 | 1050 | if (tb[TCA_ACT_INDEX] == NULL || |
84ae017a AA |
1051 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) { |
1052 | NL_SET_ERR_MSG(extack, "Invalid TC action index value"); | |
ab27cfb8 | 1053 | goto err_out; |
84ae017a | 1054 | } |
1587bac4 | 1055 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 1056 | |
ab27cfb8 | 1057 | err = -EINVAL; |
a85a970a | 1058 | ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
84ae017a AA |
1059 | if (!ops) { /* could happen in batch of actions */ |
1060 | NL_SET_ERR_MSG(extack, "Specified TC action not found"); | |
a85a970a | 1061 | goto err_out; |
84ae017a | 1062 | } |
ab27cfb8 | 1063 | err = -ENOENT; |
331a9295 | 1064 | if (ops->lookup(net, &a, index, extack) == 0) |
1da177e4 LT |
1065 | goto err_mod; |
1066 | ||
a85a970a | 1067 | module_put(ops->owner); |
1da177e4 | 1068 | return a; |
ab27cfb8 | 1069 | |
1da177e4 | 1070 | err_mod: |
a85a970a | 1071 | module_put(ops->owner); |
ab27cfb8 PM |
1072 | err_out: |
1073 | return ERR_PTR(err); | |
1da177e4 LT |
1074 | } |
1075 | ||
7316ae88 | 1076 | static int tca_action_flush(struct net *net, struct nlattr *nla, |
84ae017a AA |
1077 | struct nlmsghdr *n, u32 portid, |
1078 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
1079 | { |
1080 | struct sk_buff *skb; | |
1081 | unsigned char *b; | |
1082 | struct nlmsghdr *nlh; | |
1083 | struct tcamsg *t; | |
1084 | struct netlink_callback dcb; | |
4b3550ef | 1085 | struct nlattr *nest; |
cc7ec456 | 1086 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
a85a970a | 1087 | const struct tc_action_ops *ops; |
7ba699c6 | 1088 | struct nlattr *kind; |
36723873 | 1089 | int err = -ENOMEM; |
1da177e4 | 1090 | |
1da177e4 | 1091 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
84ae017a | 1092 | if (!skb) |
36723873 | 1093 | return err; |
1da177e4 | 1094 | |
27a884dc | 1095 | b = skb_tail_pointer(skb); |
1da177e4 | 1096 | |
84ae017a | 1097 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, extack); |
cee63723 | 1098 | if (err < 0) |
1da177e4 LT |
1099 | goto err_out; |
1100 | ||
cee63723 | 1101 | err = -EINVAL; |
7ba699c6 | 1102 | kind = tb[TCA_ACT_KIND]; |
a85a970a | 1103 | ops = tc_lookup_action(kind); |
84ae017a AA |
1104 | if (!ops) { /*some idjot trying to flush unknown action */ |
1105 | NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action"); | |
1da177e4 | 1106 | goto err_out; |
84ae017a | 1107 | } |
1da177e4 | 1108 | |
0b0f43fe JHS |
1109 | nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, |
1110 | sizeof(*t), 0); | |
84ae017a AA |
1111 | if (!nlh) { |
1112 | NL_SET_ERR_MSG(extack, "Failed to create TC action flush notification"); | |
8b00a53c | 1113 | goto out_module_put; |
84ae017a | 1114 | } |
8b00a53c | 1115 | t = nlmsg_data(nlh); |
1da177e4 | 1116 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1117 | t->tca__pad1 = 0; |
1118 | t->tca__pad2 = 0; | |
1da177e4 | 1119 | |
4b3550ef | 1120 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
84ae017a AA |
1121 | if (!nest) { |
1122 | NL_SET_ERR_MSG(extack, "Failed to add new netlink message"); | |
8b00a53c | 1123 | goto out_module_put; |
84ae017a | 1124 | } |
1da177e4 | 1125 | |
41780105 | 1126 | err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops, extack); |
66dede2d DC |
1127 | if (err <= 0) { |
1128 | nla_nest_cancel(skb, nest); | |
8b00a53c | 1129 | goto out_module_put; |
66dede2d | 1130 | } |
1da177e4 | 1131 | |
4b3550ef | 1132 | nla_nest_end(skb, nest); |
1da177e4 | 1133 | |
27a884dc | 1134 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 | 1135 | nlh->nlmsg_flags |= NLM_F_ROOT; |
a85a970a | 1136 | module_put(ops->owner); |
15e47304 | 1137 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 1138 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
1139 | if (err > 0) |
1140 | return 0; | |
84ae017a AA |
1141 | if (err < 0) |
1142 | NL_SET_ERR_MSG(extack, "Failed to send TC action flush notification"); | |
1da177e4 LT |
1143 | |
1144 | return err; | |
1145 | ||
8b00a53c | 1146 | out_module_put: |
a85a970a | 1147 | module_put(ops->owner); |
1da177e4 LT |
1148 | err_out: |
1149 | kfree_skb(skb); | |
1da177e4 LT |
1150 | return err; |
1151 | } | |
1152 | ||
16af6067 VB |
1153 | static int tcf_action_delete(struct net *net, struct list_head *actions, |
1154 | struct netlink_ext_ack *extack) | |
1155 | { | |
1156 | struct tc_action *a, *tmp; | |
1157 | u32 act_index; | |
1158 | int ret; | |
1159 | ||
1160 | list_for_each_entry_safe(a, tmp, actions, list) { | |
1161 | const struct tc_action_ops *ops = a->ops; | |
1162 | ||
1163 | /* Actions can be deleted concurrently so we must save their | |
1164 | * type and id to search again after reference is released. | |
1165 | */ | |
1166 | act_index = a->tcfa_index; | |
1167 | ||
1168 | list_del(&a->list); | |
1169 | if (tcf_action_put(a)) { | |
1170 | /* last reference, action was deleted concurrently */ | |
1171 | module_put(ops->owner); | |
1172 | } else { | |
1173 | /* now do the delete */ | |
1174 | ret = ops->delete(net, act_index); | |
1175 | if (ret < 0) | |
1176 | return ret; | |
1177 | } | |
1178 | } | |
1179 | return 0; | |
1180 | } | |
1181 | ||
a56e1953 WC |
1182 | static int |
1183 | tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions, | |
d04e6990 | 1184 | u32 portid, size_t attr_size, struct netlink_ext_ack *extack) |
a56e1953 WC |
1185 | { |
1186 | int ret; | |
1187 | struct sk_buff *skb; | |
1188 | ||
d04e6990 RM |
1189 | skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size, |
1190 | GFP_KERNEL); | |
a56e1953 WC |
1191 | if (!skb) |
1192 | return -ENOBUFS; | |
1193 | ||
1194 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION, | |
3f7c72bc | 1195 | 0, 2) <= 0) { |
84ae017a | 1196 | NL_SET_ERR_MSG(extack, "Failed to fill netlink TC action attributes"); |
a56e1953 WC |
1197 | kfree_skb(skb); |
1198 | return -EINVAL; | |
1199 | } | |
1200 | ||
1201 | /* now do the delete */ | |
16af6067 | 1202 | ret = tcf_action_delete(net, actions, extack); |
55334a5d | 1203 | if (ret < 0) { |
84ae017a | 1204 | NL_SET_ERR_MSG(extack, "Failed to delete TC action"); |
55334a5d WC |
1205 | kfree_skb(skb); |
1206 | return ret; | |
1207 | } | |
a56e1953 WC |
1208 | |
1209 | ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
1210 | n->nlmsg_flags & NLM_F_ECHO); | |
1211 | if (ret > 0) | |
1212 | return 0; | |
1213 | return ret; | |
1214 | } | |
1215 | ||
1da177e4 | 1216 | static int |
7316ae88 | 1217 | tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
84ae017a | 1218 | u32 portid, int event, struct netlink_ext_ack *extack) |
1da177e4 | 1219 | { |
cee63723 | 1220 | int i, ret; |
cc7ec456 | 1221 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 | 1222 | struct tc_action *act; |
d04e6990 | 1223 | size_t attr_size = 0; |
33be6271 | 1224 | LIST_HEAD(actions); |
1da177e4 | 1225 | |
84ae017a | 1226 | ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, extack); |
cee63723 PM |
1227 | if (ret < 0) |
1228 | return ret; | |
1da177e4 | 1229 | |
cc7ec456 | 1230 | if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) { |
1af85155 | 1231 | if (tb[1]) |
84ae017a | 1232 | return tca_action_flush(net, tb[1], n, portid, extack); |
1af85155 | 1233 | |
84ae017a | 1234 | NL_SET_ERR_MSG(extack, "Invalid netlink attributes while flushing TC action"); |
1af85155 | 1235 | return -EINVAL; |
1da177e4 LT |
1236 | } |
1237 | ||
7ba699c6 | 1238 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
84ae017a | 1239 | act = tcf_action_get_1(net, tb[i], n, portid, extack); |
ab27cfb8 PM |
1240 | if (IS_ERR(act)) { |
1241 | ret = PTR_ERR(act); | |
1da177e4 | 1242 | goto err; |
ab27cfb8 | 1243 | } |
7ba699c6 | 1244 | act->order = i; |
4e76e75d | 1245 | attr_size += tcf_action_fill_size(act); |
33be6271 | 1246 | list_add_tail(&act->list, &actions); |
1da177e4 | 1247 | } |
4e76e75d RM |
1248 | |
1249 | attr_size = tcf_action_full_attrs_size(attr_size); | |
1da177e4 LT |
1250 | |
1251 | if (event == RTM_GETACTION) | |
84ae017a | 1252 | ret = tcf_get_notify(net, portid, n, &actions, event, extack); |
1da177e4 | 1253 | else { /* delete */ |
d04e6990 | 1254 | ret = tcf_del_notify(net, n, &actions, portid, attr_size, extack); |
a56e1953 | 1255 | if (ret) |
1da177e4 | 1256 | goto err; |
1da177e4 LT |
1257 | return ret; |
1258 | } | |
1259 | err: | |
cae422f3 | 1260 | tcf_action_put_lst(&actions); |
1da177e4 LT |
1261 | return ret; |
1262 | } | |
1263 | ||
a56e1953 WC |
1264 | static int |
1265 | tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions, | |
d04e6990 | 1266 | u32 portid, size_t attr_size, struct netlink_ext_ack *extack) |
1da177e4 | 1267 | { |
1da177e4 | 1268 | struct sk_buff *skb; |
1da177e4 LT |
1269 | int err = 0; |
1270 | ||
d04e6990 RM |
1271 | skb = alloc_skb(attr_size <= NLMSG_GOODSIZE ? NLMSG_GOODSIZE : attr_size, |
1272 | GFP_KERNEL); | |
1da177e4 LT |
1273 | if (!skb) |
1274 | return -ENOBUFS; | |
1275 | ||
a56e1953 WC |
1276 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags, |
1277 | RTM_NEWACTION, 0, 0) <= 0) { | |
d143b9e3 | 1278 | NL_SET_ERR_MSG(extack, "Failed to fill netlink attributes while adding TC action"); |
a56e1953 WC |
1279 | kfree_skb(skb); |
1280 | return -EINVAL; | |
1281 | } | |
10297b99 | 1282 | |
a56e1953 WC |
1283 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
1284 | n->nlmsg_flags & NLM_F_ECHO); | |
1da177e4 LT |
1285 | if (err > 0) |
1286 | err = 0; | |
1287 | return err; | |
1da177e4 LT |
1288 | } |
1289 | ||
5a7a5555 | 1290 | static int tcf_action_add(struct net *net, struct nlattr *nla, |
aea0d727 AA |
1291 | struct nlmsghdr *n, u32 portid, int ovr, |
1292 | struct netlink_ext_ack *extack) | |
1da177e4 | 1293 | { |
d04e6990 | 1294 | size_t attr_size = 0; |
1da177e4 | 1295 | int ret = 0; |
33be6271 | 1296 | LIST_HEAD(actions); |
1da177e4 | 1297 | |
aea0d727 | 1298 | ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0, &actions, |
789871bb | 1299 | &attr_size, true, extack); |
33be6271 | 1300 | if (ret) |
f07fed82 | 1301 | return ret; |
cae422f3 VB |
1302 | ret = tcf_add_notify(net, n, &actions, portid, attr_size, extack); |
1303 | if (ovr) | |
1304 | tcf_action_put_lst(&actions); | |
1da177e4 | 1305 | |
cae422f3 | 1306 | return ret; |
1da177e4 LT |
1307 | } |
1308 | ||
90825b23 JHS |
1309 | static u32 tcaa_root_flags_allowed = TCA_FLAG_LARGE_DUMP_ON; |
1310 | static const struct nla_policy tcaa_policy[TCA_ROOT_MAX + 1] = { | |
1311 | [TCA_ROOT_FLAGS] = { .type = NLA_BITFIELD32, | |
1312 | .validation_data = &tcaa_root_flags_allowed }, | |
e62e484d | 1313 | [TCA_ROOT_TIME_DELTA] = { .type = NLA_U32 }, |
90825b23 JHS |
1314 | }; |
1315 | ||
c21ef3e3 DA |
1316 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, |
1317 | struct netlink_ext_ack *extack) | |
1da177e4 | 1318 | { |
3b1e0a65 | 1319 | struct net *net = sock_net(skb->sk); |
90825b23 | 1320 | struct nlattr *tca[TCA_ROOT_MAX + 1]; |
15e47304 | 1321 | u32 portid = skb ? NETLINK_CB(skb).portid : 0; |
1da177e4 LT |
1322 | int ret = 0, ovr = 0; |
1323 | ||
0b0f43fe JHS |
1324 | if ((n->nlmsg_type != RTM_GETACTION) && |
1325 | !netlink_capable(skb, CAP_NET_ADMIN)) | |
dfc47ef8 EB |
1326 | return -EPERM; |
1327 | ||
90825b23 | 1328 | ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ROOT_MAX, NULL, |
c21ef3e3 | 1329 | extack); |
7ba699c6 PM |
1330 | if (ret < 0) |
1331 | return ret; | |
1332 | ||
1333 | if (tca[TCA_ACT_TAB] == NULL) { | |
84ae017a | 1334 | NL_SET_ERR_MSG(extack, "Netlink action attributes missing"); |
1da177e4 LT |
1335 | return -EINVAL; |
1336 | } | |
1337 | ||
cc7ec456 | 1338 | /* n->nlmsg_flags & NLM_F_CREATE */ |
1da177e4 LT |
1339 | switch (n->nlmsg_type) { |
1340 | case RTM_NEWACTION: | |
1341 | /* we are going to assume all other flags | |
25985edc | 1342 | * imply create only if it doesn't exist |
1da177e4 LT |
1343 | * Note that CREATE | EXCL implies that |
1344 | * but since we want avoid ambiguity (eg when flags | |
1345 | * is zero) then just set this | |
1346 | */ | |
cc7ec456 | 1347 | if (n->nlmsg_flags & NLM_F_REPLACE) |
1da177e4 LT |
1348 | ovr = 1; |
1349 | replay: | |
aea0d727 AA |
1350 | ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr, |
1351 | extack); | |
1da177e4 LT |
1352 | if (ret == -EAGAIN) |
1353 | goto replay; | |
1354 | break; | |
1355 | case RTM_DELACTION: | |
7316ae88 | 1356 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
84ae017a | 1357 | portid, RTM_DELACTION, extack); |
1da177e4 LT |
1358 | break; |
1359 | case RTM_GETACTION: | |
7316ae88 | 1360 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
84ae017a | 1361 | portid, RTM_GETACTION, extack); |
1da177e4 LT |
1362 | break; |
1363 | default: | |
1364 | BUG(); | |
1365 | } | |
1366 | ||
1367 | return ret; | |
1368 | } | |
1369 | ||
90825b23 | 1370 | static struct nlattr *find_dump_kind(struct nlattr **nla) |
1da177e4 | 1371 | { |
cc7ec456 | 1372 | struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1]; |
7ba699c6 | 1373 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
7ba699c6 | 1374 | struct nlattr *kind; |
1da177e4 | 1375 | |
7ba699c6 | 1376 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
1377 | if (tb1 == NULL) |
1378 | return NULL; | |
1379 | ||
7ba699c6 | 1380 | if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), |
fceb6435 | 1381 | NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0) |
1da177e4 | 1382 | return NULL; |
1da177e4 | 1383 | |
6d834e04 PM |
1384 | if (tb[1] == NULL) |
1385 | return NULL; | |
fceb6435 | 1386 | if (nla_parse_nested(tb2, TCA_ACT_MAX, tb[1], NULL, NULL) < 0) |
1da177e4 | 1387 | return NULL; |
7ba699c6 | 1388 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 1389 | |
26dab893 | 1390 | return kind; |
1da177e4 LT |
1391 | } |
1392 | ||
5a7a5555 | 1393 | static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 1394 | { |
ddf97ccd | 1395 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1396 | struct nlmsghdr *nlh; |
27a884dc | 1397 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1398 | struct nlattr *nest; |
1da177e4 | 1399 | struct tc_action_ops *a_o; |
1da177e4 | 1400 | int ret = 0; |
8b00a53c | 1401 | struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh); |
90825b23 JHS |
1402 | struct nlattr *tb[TCA_ROOT_MAX + 1]; |
1403 | struct nlattr *count_attr = NULL; | |
e62e484d | 1404 | unsigned long jiffy_since = 0; |
90825b23 JHS |
1405 | struct nlattr *kind = NULL; |
1406 | struct nla_bitfield32 bf; | |
e62e484d | 1407 | u32 msecs_since = 0; |
90825b23 JHS |
1408 | u32 act_count = 0; |
1409 | ||
1410 | ret = nlmsg_parse(cb->nlh, sizeof(struct tcamsg), tb, TCA_ROOT_MAX, | |
1411 | tcaa_policy, NULL); | |
1412 | if (ret < 0) | |
1413 | return ret; | |
1da177e4 | 1414 | |
90825b23 | 1415 | kind = find_dump_kind(tb); |
1da177e4 | 1416 | if (kind == NULL) { |
6ff9c364 | 1417 | pr_info("tc_dump_action: action bad kind\n"); |
1da177e4 LT |
1418 | return 0; |
1419 | } | |
1420 | ||
26dab893 | 1421 | a_o = tc_lookup_action(kind); |
cc7ec456 | 1422 | if (a_o == NULL) |
1da177e4 | 1423 | return 0; |
1da177e4 | 1424 | |
90825b23 JHS |
1425 | cb->args[2] = 0; |
1426 | if (tb[TCA_ROOT_FLAGS]) { | |
1427 | bf = nla_get_bitfield32(tb[TCA_ROOT_FLAGS]); | |
1428 | cb->args[2] = bf.value; | |
1429 | } | |
1430 | ||
e62e484d JHS |
1431 | if (tb[TCA_ROOT_TIME_DELTA]) { |
1432 | msecs_since = nla_get_u32(tb[TCA_ROOT_TIME_DELTA]); | |
1433 | } | |
1434 | ||
15e47304 | 1435 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
8b00a53c DM |
1436 | cb->nlh->nlmsg_type, sizeof(*t), 0); |
1437 | if (!nlh) | |
1438 | goto out_module_put; | |
90825b23 | 1439 | |
e62e484d JHS |
1440 | if (msecs_since) |
1441 | jiffy_since = jiffies - msecs_to_jiffies(msecs_since); | |
1442 | ||
8b00a53c | 1443 | t = nlmsg_data(nlh); |
1da177e4 | 1444 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1445 | t->tca__pad1 = 0; |
1446 | t->tca__pad2 = 0; | |
e62e484d | 1447 | cb->args[3] = jiffy_since; |
90825b23 JHS |
1448 | count_attr = nla_reserve(skb, TCA_ROOT_COUNT, sizeof(u32)); |
1449 | if (!count_attr) | |
1450 | goto out_module_put; | |
1da177e4 | 1451 | |
4b3550ef PM |
1452 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
1453 | if (nest == NULL) | |
8b00a53c | 1454 | goto out_module_put; |
1da177e4 | 1455 | |
41780105 | 1456 | ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o, NULL); |
1da177e4 | 1457 | if (ret < 0) |
8b00a53c | 1458 | goto out_module_put; |
1da177e4 LT |
1459 | |
1460 | if (ret > 0) { | |
4b3550ef | 1461 | nla_nest_end(skb, nest); |
1da177e4 | 1462 | ret = skb->len; |
90825b23 JHS |
1463 | act_count = cb->args[1]; |
1464 | memcpy(nla_data(count_attr), &act_count, sizeof(u32)); | |
1465 | cb->args[1] = 0; | |
1da177e4 | 1466 | } else |
ebecaa66 | 1467 | nlmsg_trim(skb, b); |
1da177e4 | 1468 | |
27a884dc | 1469 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
15e47304 | 1470 | if (NETLINK_CB(cb->skb).portid && ret) |
1da177e4 LT |
1471 | nlh->nlmsg_flags |= NLM_F_MULTI; |
1472 | module_put(a_o->owner); | |
1473 | return skb->len; | |
1474 | ||
8b00a53c | 1475 | out_module_put: |
1da177e4 | 1476 | module_put(a_o->owner); |
dc5fc579 | 1477 | nlmsg_trim(skb, b); |
1da177e4 LT |
1478 | return skb->len; |
1479 | } | |
1480 | ||
b3f55bdd JP |
1481 | struct tcf_action_net { |
1482 | struct rhashtable egdev_ht; | |
1483 | }; | |
1484 | ||
1485 | static unsigned int tcf_action_net_id; | |
1486 | ||
1487 | struct tcf_action_egdev_cb { | |
1488 | struct list_head list; | |
1489 | tc_setup_cb_t *cb; | |
1490 | void *cb_priv; | |
1491 | }; | |
1492 | ||
1493 | struct tcf_action_egdev { | |
1494 | struct rhash_head ht_node; | |
1495 | const struct net_device *dev; | |
1496 | unsigned int refcnt; | |
1497 | struct list_head cb_list; | |
1498 | }; | |
1499 | ||
1500 | static const struct rhashtable_params tcf_action_egdev_ht_params = { | |
1501 | .key_offset = offsetof(struct tcf_action_egdev, dev), | |
1502 | .head_offset = offsetof(struct tcf_action_egdev, ht_node), | |
1503 | .key_len = sizeof(const struct net_device *), | |
1504 | }; | |
1505 | ||
1506 | static struct tcf_action_egdev * | |
1507 | tcf_action_egdev_lookup(const struct net_device *dev) | |
1508 | { | |
1509 | struct net *net = dev_net(dev); | |
1510 | struct tcf_action_net *tan = net_generic(net, tcf_action_net_id); | |
1511 | ||
1512 | return rhashtable_lookup_fast(&tan->egdev_ht, &dev, | |
1513 | tcf_action_egdev_ht_params); | |
1514 | } | |
1515 | ||
1516 | static struct tcf_action_egdev * | |
1517 | tcf_action_egdev_get(const struct net_device *dev) | |
1518 | { | |
1519 | struct tcf_action_egdev *egdev; | |
1520 | struct tcf_action_net *tan; | |
1521 | ||
1522 | egdev = tcf_action_egdev_lookup(dev); | |
1523 | if (egdev) | |
1524 | goto inc_ref; | |
1525 | ||
1526 | egdev = kzalloc(sizeof(*egdev), GFP_KERNEL); | |
1527 | if (!egdev) | |
1528 | return NULL; | |
1529 | INIT_LIST_HEAD(&egdev->cb_list); | |
0843c092 | 1530 | egdev->dev = dev; |
b3f55bdd JP |
1531 | tan = net_generic(dev_net(dev), tcf_action_net_id); |
1532 | rhashtable_insert_fast(&tan->egdev_ht, &egdev->ht_node, | |
1533 | tcf_action_egdev_ht_params); | |
1534 | ||
1535 | inc_ref: | |
1536 | egdev->refcnt++; | |
1537 | return egdev; | |
1538 | } | |
1539 | ||
1540 | static void tcf_action_egdev_put(struct tcf_action_egdev *egdev) | |
1541 | { | |
1542 | struct tcf_action_net *tan; | |
1543 | ||
1544 | if (--egdev->refcnt) | |
1545 | return; | |
1546 | tan = net_generic(dev_net(egdev->dev), tcf_action_net_id); | |
1547 | rhashtable_remove_fast(&tan->egdev_ht, &egdev->ht_node, | |
1548 | tcf_action_egdev_ht_params); | |
1549 | kfree(egdev); | |
1550 | } | |
1551 | ||
1552 | static struct tcf_action_egdev_cb * | |
1553 | tcf_action_egdev_cb_lookup(struct tcf_action_egdev *egdev, | |
1554 | tc_setup_cb_t *cb, void *cb_priv) | |
1555 | { | |
1556 | struct tcf_action_egdev_cb *egdev_cb; | |
1557 | ||
1558 | list_for_each_entry(egdev_cb, &egdev->cb_list, list) | |
1559 | if (egdev_cb->cb == cb && egdev_cb->cb_priv == cb_priv) | |
1560 | return egdev_cb; | |
1561 | return NULL; | |
1562 | } | |
1563 | ||
1564 | static int tcf_action_egdev_cb_call(struct tcf_action_egdev *egdev, | |
1565 | enum tc_setup_type type, | |
1566 | void *type_data, bool err_stop) | |
1567 | { | |
1568 | struct tcf_action_egdev_cb *egdev_cb; | |
1569 | int ok_count = 0; | |
1570 | int err; | |
1571 | ||
1572 | list_for_each_entry(egdev_cb, &egdev->cb_list, list) { | |
1573 | err = egdev_cb->cb(type, type_data, egdev_cb->cb_priv); | |
1574 | if (err) { | |
1575 | if (err_stop) | |
1576 | return err; | |
1577 | } else { | |
1578 | ok_count++; | |
1579 | } | |
1580 | } | |
1581 | return ok_count; | |
1582 | } | |
1583 | ||
1584 | static int tcf_action_egdev_cb_add(struct tcf_action_egdev *egdev, | |
1585 | tc_setup_cb_t *cb, void *cb_priv) | |
1586 | { | |
1587 | struct tcf_action_egdev_cb *egdev_cb; | |
1588 | ||
1589 | egdev_cb = tcf_action_egdev_cb_lookup(egdev, cb, cb_priv); | |
1590 | if (WARN_ON(egdev_cb)) | |
1591 | return -EEXIST; | |
1592 | egdev_cb = kzalloc(sizeof(*egdev_cb), GFP_KERNEL); | |
1593 | if (!egdev_cb) | |
1594 | return -ENOMEM; | |
1595 | egdev_cb->cb = cb; | |
1596 | egdev_cb->cb_priv = cb_priv; | |
1597 | list_add(&egdev_cb->list, &egdev->cb_list); | |
1598 | return 0; | |
1599 | } | |
1600 | ||
1601 | static void tcf_action_egdev_cb_del(struct tcf_action_egdev *egdev, | |
1602 | tc_setup_cb_t *cb, void *cb_priv) | |
1603 | { | |
1604 | struct tcf_action_egdev_cb *egdev_cb; | |
1605 | ||
1606 | egdev_cb = tcf_action_egdev_cb_lookup(egdev, cb, cb_priv); | |
1607 | if (WARN_ON(!egdev_cb)) | |
1608 | return; | |
1609 | list_del(&egdev_cb->list); | |
1610 | kfree(egdev_cb); | |
1611 | } | |
1612 | ||
1613 | static int __tc_setup_cb_egdev_register(const struct net_device *dev, | |
1614 | tc_setup_cb_t *cb, void *cb_priv) | |
1615 | { | |
1616 | struct tcf_action_egdev *egdev = tcf_action_egdev_get(dev); | |
1617 | int err; | |
1618 | ||
1619 | if (!egdev) | |
1620 | return -ENOMEM; | |
1621 | err = tcf_action_egdev_cb_add(egdev, cb, cb_priv); | |
1622 | if (err) | |
1623 | goto err_cb_add; | |
1624 | return 0; | |
1625 | ||
1626 | err_cb_add: | |
1627 | tcf_action_egdev_put(egdev); | |
1628 | return err; | |
1629 | } | |
1630 | int tc_setup_cb_egdev_register(const struct net_device *dev, | |
1631 | tc_setup_cb_t *cb, void *cb_priv) | |
1632 | { | |
1633 | int err; | |
1634 | ||
1635 | rtnl_lock(); | |
1636 | err = __tc_setup_cb_egdev_register(dev, cb, cb_priv); | |
1637 | rtnl_unlock(); | |
1638 | return err; | |
1639 | } | |
1640 | EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_register); | |
1641 | ||
1642 | static void __tc_setup_cb_egdev_unregister(const struct net_device *dev, | |
1643 | tc_setup_cb_t *cb, void *cb_priv) | |
1644 | { | |
1645 | struct tcf_action_egdev *egdev = tcf_action_egdev_lookup(dev); | |
1646 | ||
1647 | if (WARN_ON(!egdev)) | |
1648 | return; | |
1649 | tcf_action_egdev_cb_del(egdev, cb, cb_priv); | |
1650 | tcf_action_egdev_put(egdev); | |
1651 | } | |
1652 | void tc_setup_cb_egdev_unregister(const struct net_device *dev, | |
1653 | tc_setup_cb_t *cb, void *cb_priv) | |
1654 | { | |
1655 | rtnl_lock(); | |
1656 | __tc_setup_cb_egdev_unregister(dev, cb, cb_priv); | |
1657 | rtnl_unlock(); | |
1658 | } | |
1659 | EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_unregister); | |
1660 | ||
1661 | int tc_setup_cb_egdev_call(const struct net_device *dev, | |
1662 | enum tc_setup_type type, void *type_data, | |
1663 | bool err_stop) | |
1664 | { | |
1665 | struct tcf_action_egdev *egdev = tcf_action_egdev_lookup(dev); | |
1666 | ||
1667 | if (!egdev) | |
1668 | return 0; | |
1669 | return tcf_action_egdev_cb_call(egdev, type, type_data, err_stop); | |
1670 | } | |
1671 | EXPORT_SYMBOL_GPL(tc_setup_cb_egdev_call); | |
1672 | ||
1673 | static __net_init int tcf_action_net_init(struct net *net) | |
1674 | { | |
1675 | struct tcf_action_net *tan = net_generic(net, tcf_action_net_id); | |
1676 | ||
1677 | return rhashtable_init(&tan->egdev_ht, &tcf_action_egdev_ht_params); | |
1678 | } | |
1679 | ||
1680 | static void __net_exit tcf_action_net_exit(struct net *net) | |
1681 | { | |
1682 | struct tcf_action_net *tan = net_generic(net, tcf_action_net_id); | |
1683 | ||
1684 | rhashtable_destroy(&tan->egdev_ht); | |
1685 | } | |
1686 | ||
1687 | static struct pernet_operations tcf_action_net_ops = { | |
1688 | .init = tcf_action_net_init, | |
1689 | .exit = tcf_action_net_exit, | |
1690 | .id = &tcf_action_net_id, | |
1691 | .size = sizeof(struct tcf_action_net), | |
1692 | }; | |
1693 | ||
1da177e4 LT |
1694 | static int __init tc_action_init(void) |
1695 | { | |
b3f55bdd JP |
1696 | int err; |
1697 | ||
1698 | err = register_pernet_subsys(&tcf_action_net_ops); | |
1699 | if (err) | |
1700 | return err; | |
1701 | ||
b97bac64 FW |
1702 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, 0); |
1703 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, 0); | |
c7ac8679 | 1704 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, |
b97bac64 | 1705 | 0); |
1da177e4 | 1706 | |
1da177e4 LT |
1707 | return 0; |
1708 | } | |
1709 | ||
1710 | subsys_initcall(tc_action_init); |