Commit | Line | Data |
---|---|---|
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> |
b854272b DL |
24 | #include <net/net_namespace.h> |
25 | #include <net/sock.h> | |
1da177e4 LT |
26 | #include <net/sch_generic.h> |
27 | #include <net/act_api.h> | |
dc5fc579 | 28 | #include <net/netlink.h> |
1da177e4 | 29 | |
e9ce1cd3 DM |
30 | void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo) |
31 | { | |
89819dc0 WC |
32 | spin_lock_bh(&hinfo->lock); |
33 | hlist_del(&p->tcfc_head); | |
34 | spin_unlock_bh(&hinfo->lock); | |
35 | gen_kill_estimator(&p->tcfc_bstats, | |
36 | &p->tcfc_rate_est); | |
37 | /* | |
38 | * gen_estimator est_timer() might access p->tcfc_lock | |
39 | * or bstats, wait a RCU grace period before freeing p | |
40 | */ | |
41 | kfree_rcu(p, tcfc_rcu); | |
e9ce1cd3 DM |
42 | } |
43 | EXPORT_SYMBOL(tcf_hash_destroy); | |
44 | ||
45 | int tcf_hash_release(struct tcf_common *p, int bind, | |
46 | struct tcf_hashinfo *hinfo) | |
47 | { | |
48 | int ret = 0; | |
49 | ||
50 | if (p) { | |
51 | if (bind) | |
52 | p->tcfc_bindcnt--; | |
53 | ||
54 | p->tcfc_refcnt--; | |
10297b99 | 55 | if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) { |
e9ce1cd3 DM |
56 | tcf_hash_destroy(p, hinfo); |
57 | ret = 1; | |
58 | } | |
59 | } | |
60 | return ret; | |
61 | } | |
62 | EXPORT_SYMBOL(tcf_hash_release); | |
63 | ||
64 | static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
65 | struct tc_action *a, struct tcf_hashinfo *hinfo) | |
66 | { | |
89819dc0 | 67 | struct hlist_head *head; |
e9ce1cd3 | 68 | struct tcf_common *p; |
cc7ec456 | 69 | int err = 0, index = -1, i = 0, s_i = 0, n_i = 0; |
4b3550ef | 70 | struct nlattr *nest; |
e9ce1cd3 | 71 | |
89819dc0 | 72 | spin_lock_bh(&hinfo->lock); |
e9ce1cd3 DM |
73 | |
74 | s_i = cb->args[0]; | |
75 | ||
76 | for (i = 0; i < (hinfo->hmask + 1); i++) { | |
89819dc0 | 77 | head = &hinfo->htab[tcf_hash(i, hinfo->hmask)]; |
e9ce1cd3 | 78 | |
89819dc0 | 79 | hlist_for_each_entry_rcu(p, head, tcfc_head) { |
e9ce1cd3 DM |
80 | index++; |
81 | if (index < s_i) | |
82 | continue; | |
83 | a->priv = p; | |
84 | a->order = n_i; | |
4b3550ef PM |
85 | |
86 | nest = nla_nest_start(skb, a->order); | |
87 | if (nest == NULL) | |
88 | goto nla_put_failure; | |
e9ce1cd3 DM |
89 | err = tcf_action_dump_1(skb, a, 0, 0); |
90 | if (err < 0) { | |
91 | index--; | |
4b3550ef | 92 | nlmsg_trim(skb, nest); |
e9ce1cd3 DM |
93 | goto done; |
94 | } | |
4b3550ef | 95 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
96 | n_i++; |
97 | if (n_i >= TCA_ACT_MAX_PRIO) | |
98 | goto done; | |
99 | } | |
100 | } | |
101 | done: | |
89819dc0 | 102 | spin_unlock_bh(&hinfo->lock); |
e9ce1cd3 DM |
103 | if (n_i) |
104 | cb->args[0] += n_i; | |
105 | return n_i; | |
106 | ||
7ba699c6 | 107 | nla_put_failure: |
4b3550ef | 108 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
109 | goto done; |
110 | } | |
111 | ||
112 | static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a, | |
113 | struct tcf_hashinfo *hinfo) | |
114 | { | |
89819dc0 WC |
115 | struct hlist_head *head; |
116 | struct hlist_node *n; | |
117 | struct tcf_common *p; | |
4b3550ef | 118 | struct nlattr *nest; |
cc7ec456 | 119 | int i = 0, n_i = 0; |
e9ce1cd3 | 120 | |
4b3550ef PM |
121 | nest = nla_nest_start(skb, a->order); |
122 | if (nest == NULL) | |
123 | goto nla_put_failure; | |
1b34ec43 DM |
124 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) |
125 | goto nla_put_failure; | |
e9ce1cd3 | 126 | for (i = 0; i < (hinfo->hmask + 1); i++) { |
89819dc0 WC |
127 | head = &hinfo->htab[tcf_hash(i, hinfo->hmask)]; |
128 | hlist_for_each_entry_safe(p, n, head, tcfc_head) { | |
e9ce1cd3 | 129 | if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo)) |
cc7ec456 | 130 | module_put(a->ops->owner); |
e9ce1cd3 | 131 | n_i++; |
e9ce1cd3 DM |
132 | } |
133 | } | |
1b34ec43 DM |
134 | if (nla_put_u32(skb, TCA_FCNT, n_i)) |
135 | goto nla_put_failure; | |
4b3550ef | 136 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
137 | |
138 | return n_i; | |
7ba699c6 | 139 | nla_put_failure: |
4b3550ef | 140 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
141 | return -EINVAL; |
142 | } | |
143 | ||
144 | int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
145 | int type, struct tc_action *a) | |
146 | { | |
147 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
148 | ||
149 | if (type == RTM_DELACTION) { | |
150 | return tcf_del_walker(skb, a, hinfo); | |
151 | } else if (type == RTM_GETACTION) { | |
152 | return tcf_dump_walker(skb, cb, a, hinfo); | |
153 | } else { | |
6ff9c364 | 154 | WARN(1, "tcf_generic_walker: unknown action %d\n", type); |
e9ce1cd3 DM |
155 | return -EINVAL; |
156 | } | |
157 | } | |
158 | EXPORT_SYMBOL(tcf_generic_walker); | |
159 | ||
160 | struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo) | |
161 | { | |
89819dc0 WC |
162 | struct tcf_common *p = NULL; |
163 | struct hlist_head *head; | |
e9ce1cd3 | 164 | |
89819dc0 WC |
165 | spin_lock_bh(&hinfo->lock); |
166 | head = &hinfo->htab[tcf_hash(index, hinfo->hmask)]; | |
167 | hlist_for_each_entry_rcu(p, head, tcfc_head) | |
e9ce1cd3 DM |
168 | if (p->tcfc_index == index) |
169 | break; | |
89819dc0 | 170 | spin_unlock_bh(&hinfo->lock); |
e9ce1cd3 DM |
171 | |
172 | return p; | |
173 | } | |
174 | EXPORT_SYMBOL(tcf_hash_lookup); | |
175 | ||
176 | u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo) | |
177 | { | |
178 | u32 val = *idx_gen; | |
179 | ||
180 | do { | |
181 | if (++val == 0) | |
182 | val = 1; | |
183 | } while (tcf_hash_lookup(val, hinfo)); | |
184 | ||
17569fae YY |
185 | *idx_gen = val; |
186 | return val; | |
e9ce1cd3 DM |
187 | } |
188 | EXPORT_SYMBOL(tcf_hash_new_index); | |
189 | ||
190 | int tcf_hash_search(struct tc_action *a, u32 index) | |
191 | { | |
192 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
193 | struct tcf_common *p = tcf_hash_lookup(index, hinfo); | |
194 | ||
195 | if (p) { | |
196 | a->priv = p; | |
197 | return 1; | |
198 | } | |
199 | return 0; | |
200 | } | |
201 | EXPORT_SYMBOL(tcf_hash_search); | |
202 | ||
203 | struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind, | |
204 | struct tcf_hashinfo *hinfo) | |
205 | { | |
206 | struct tcf_common *p = NULL; | |
207 | if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) { | |
76aab2c1 | 208 | if (bind) |
e9ce1cd3 | 209 | p->tcfc_bindcnt++; |
76aab2c1 | 210 | p->tcfc_refcnt++; |
e9ce1cd3 DM |
211 | a->priv = p; |
212 | } | |
213 | return p; | |
214 | } | |
215 | EXPORT_SYMBOL(tcf_hash_check); | |
216 | ||
0e991ec6 SH |
217 | struct tcf_common *tcf_hash_create(u32 index, struct nlattr *est, |
218 | struct tc_action *a, int size, int bind, | |
219 | u32 *idx_gen, struct tcf_hashinfo *hinfo) | |
e9ce1cd3 DM |
220 | { |
221 | struct tcf_common *p = kzalloc(size, GFP_KERNEL); | |
222 | ||
223 | if (unlikely(!p)) | |
0e991ec6 | 224 | return ERR_PTR(-ENOMEM); |
e9ce1cd3 DM |
225 | p->tcfc_refcnt = 1; |
226 | if (bind) | |
227 | p->tcfc_bindcnt = 1; | |
228 | ||
229 | spin_lock_init(&p->tcfc_lock); | |
89819dc0 | 230 | INIT_HLIST_NODE(&p->tcfc_head); |
e9ce1cd3 DM |
231 | p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo); |
232 | p->tcfc_tm.install = jiffies; | |
233 | p->tcfc_tm.lastuse = jiffies; | |
0e991ec6 SH |
234 | if (est) { |
235 | int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est, | |
236 | &p->tcfc_lock, est); | |
237 | if (err) { | |
238 | kfree(p); | |
239 | return ERR_PTR(err); | |
240 | } | |
241 | } | |
242 | ||
e9ce1cd3 DM |
243 | a->priv = (void *) p; |
244 | return p; | |
245 | } | |
246 | EXPORT_SYMBOL(tcf_hash_create); | |
247 | ||
248 | void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo) | |
249 | { | |
250 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); | |
251 | ||
89819dc0 WC |
252 | spin_lock_bh(&hinfo->lock); |
253 | hlist_add_head(&p->tcfc_head, &hinfo->htab[h]); | |
254 | spin_unlock_bh(&hinfo->lock); | |
e9ce1cd3 DM |
255 | } |
256 | EXPORT_SYMBOL(tcf_hash_insert); | |
1da177e4 LT |
257 | |
258 | static struct tc_action_ops *act_base = NULL; | |
259 | static DEFINE_RWLOCK(act_mod_lock); | |
260 | ||
261 | int tcf_register_action(struct tc_action_ops *act) | |
262 | { | |
263 | struct tc_action_ops *a, **ap; | |
264 | ||
76c82d7a JHS |
265 | /* Must supply act, dump, cleanup and init */ |
266 | if (!act->act || !act->dump || !act->cleanup || !act->init) | |
267 | return -EINVAL; | |
268 | ||
382ca8a1 | 269 | /* Supply defaults */ |
63ef6174 JHS |
270 | if (!act->lookup) |
271 | act->lookup = tcf_hash_search; | |
382ca8a1 JHS |
272 | if (!act->walk) |
273 | act->walk = tcf_generic_walker; | |
63ef6174 | 274 | |
1da177e4 LT |
275 | write_lock(&act_mod_lock); |
276 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) { | |
277 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { | |
278 | write_unlock(&act_mod_lock); | |
279 | return -EEXIST; | |
280 | } | |
281 | } | |
282 | act->next = NULL; | |
283 | *ap = act; | |
284 | write_unlock(&act_mod_lock); | |
285 | return 0; | |
286 | } | |
62e3ba1b | 287 | EXPORT_SYMBOL(tcf_register_action); |
1da177e4 LT |
288 | |
289 | int tcf_unregister_action(struct tc_action_ops *act) | |
290 | { | |
291 | struct tc_action_ops *a, **ap; | |
292 | int err = -ENOENT; | |
293 | ||
294 | write_lock(&act_mod_lock); | |
295 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) | |
296 | if (a == act) | |
297 | break; | |
298 | if (a) { | |
299 | *ap = a->next; | |
300 | a->next = NULL; | |
301 | err = 0; | |
302 | } | |
303 | write_unlock(&act_mod_lock); | |
304 | return err; | |
305 | } | |
62e3ba1b | 306 | EXPORT_SYMBOL(tcf_unregister_action); |
1da177e4 LT |
307 | |
308 | /* lookup by name */ | |
309 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
310 | { | |
311 | struct tc_action_ops *a = NULL; | |
312 | ||
313 | if (kind) { | |
314 | read_lock(&act_mod_lock); | |
315 | for (a = act_base; a; a = a->next) { | |
316 | if (strcmp(kind, a->kind) == 0) { | |
317 | if (!try_module_get(a->owner)) { | |
318 | read_unlock(&act_mod_lock); | |
319 | return NULL; | |
320 | } | |
321 | break; | |
322 | } | |
323 | } | |
324 | read_unlock(&act_mod_lock); | |
325 | } | |
326 | return a; | |
327 | } | |
328 | ||
7ba699c6 PM |
329 | /* lookup by nlattr */ |
330 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) | |
1da177e4 LT |
331 | { |
332 | struct tc_action_ops *a = NULL; | |
333 | ||
334 | if (kind) { | |
335 | read_lock(&act_mod_lock); | |
336 | for (a = act_base; a; a = a->next) { | |
7ba699c6 | 337 | if (nla_strcmp(kind, a->kind) == 0) { |
1da177e4 LT |
338 | if (!try_module_get(a->owner)) { |
339 | read_unlock(&act_mod_lock); | |
340 | return NULL; | |
341 | } | |
342 | break; | |
343 | } | |
344 | } | |
345 | read_unlock(&act_mod_lock); | |
346 | } | |
347 | return a; | |
348 | } | |
349 | ||
350 | #if 0 | |
351 | /* lookup by id */ | |
352 | static struct tc_action_ops *tc_lookup_action_id(u32 type) | |
353 | { | |
354 | struct tc_action_ops *a = NULL; | |
355 | ||
356 | if (type) { | |
357 | read_lock(&act_mod_lock); | |
358 | for (a = act_base; a; a = a->next) { | |
359 | if (a->type == type) { | |
360 | if (!try_module_get(a->owner)) { | |
361 | read_unlock(&act_mod_lock); | |
362 | return NULL; | |
363 | } | |
364 | break; | |
365 | } | |
366 | } | |
367 | read_unlock(&act_mod_lock); | |
368 | } | |
369 | return a; | |
370 | } | |
371 | #endif | |
372 | ||
33be6271 | 373 | int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions, |
10297b99 | 374 | struct tcf_result *res) |
1da177e4 | 375 | { |
dc7f9f6e | 376 | const struct tc_action *a; |
1da177e4 LT |
377 | int ret = -1; |
378 | ||
379 | if (skb->tc_verd & TC_NCLS) { | |
380 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
1da177e4 LT |
381 | ret = TC_ACT_OK; |
382 | goto exec_done; | |
383 | } | |
33be6271 | 384 | list_for_each_entry(a, actions, list) { |
1da177e4 | 385 | repeat: |
76c82d7a | 386 | if (a->ops) { |
f43c5a0d | 387 | ret = a->ops->act(skb, a, res); |
1da177e4 LT |
388 | if (TC_MUNGED & skb->tc_verd) { |
389 | /* copied already, allow trampling */ | |
390 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); | |
391 | skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd); | |
392 | } | |
1da177e4 LT |
393 | if (ret == TC_ACT_REPEAT) |
394 | goto repeat; /* we need a ttl - JHS */ | |
14d50e78 HS |
395 | if (ret != TC_ACT_PIPE) |
396 | goto exec_done; | |
1da177e4 | 397 | } |
1da177e4 LT |
398 | } |
399 | exec_done: | |
1da177e4 LT |
400 | return ret; |
401 | } | |
62e3ba1b | 402 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 | 403 | |
33be6271 | 404 | void tcf_action_destroy(struct list_head *actions, int bind) |
1da177e4 | 405 | { |
33be6271 | 406 | struct tc_action *a, *tmp; |
1da177e4 | 407 | |
33be6271 | 408 | list_for_each_entry_safe(a, tmp, actions, list) { |
76c82d7a | 409 | if (a->ops) { |
1da177e4 LT |
410 | if (a->ops->cleanup(a, bind) == ACT_P_DELETED) |
411 | module_put(a->ops->owner); | |
33be6271 | 412 | list_del(&a->list); |
1da177e4 | 413 | kfree(a); |
6ff9c364 | 414 | } else { |
415 | /*FIXME: Remove later - catch insertion bugs*/ | |
416 | WARN(1, "tcf_action_destroy: BUG? destroying NULL ops\n"); | |
33be6271 | 417 | list_del(&a->list); |
1da177e4 LT |
418 | kfree(a); |
419 | } | |
420 | } | |
421 | } | |
422 | ||
423 | int | |
424 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
425 | { | |
426 | int err = -EINVAL; | |
427 | ||
76c82d7a | 428 | if (a->ops == NULL) |
1da177e4 LT |
429 | return err; |
430 | return a->ops->dump(skb, a, bind, ref); | |
431 | } | |
432 | ||
433 | int | |
434 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
435 | { | |
436 | int err = -EINVAL; | |
27a884dc | 437 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 438 | struct nlattr *nest; |
1da177e4 | 439 | |
76c82d7a | 440 | if (a->ops == NULL) |
1da177e4 LT |
441 | return err; |
442 | ||
1b34ec43 DM |
443 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) |
444 | goto nla_put_failure; | |
1da177e4 | 445 | if (tcf_action_copy_stats(skb, a, 0)) |
7ba699c6 | 446 | goto nla_put_failure; |
4b3550ef PM |
447 | nest = nla_nest_start(skb, TCA_OPTIONS); |
448 | if (nest == NULL) | |
449 | goto nla_put_failure; | |
cc7ec456 ED |
450 | err = tcf_action_dump_old(skb, a, bind, ref); |
451 | if (err > 0) { | |
4b3550ef | 452 | nla_nest_end(skb, nest); |
1da177e4 LT |
453 | return err; |
454 | } | |
455 | ||
7ba699c6 | 456 | nla_put_failure: |
dc5fc579 | 457 | nlmsg_trim(skb, b); |
1da177e4 LT |
458 | return -1; |
459 | } | |
62e3ba1b | 460 | EXPORT_SYMBOL(tcf_action_dump_1); |
1da177e4 LT |
461 | |
462 | int | |
33be6271 | 463 | tcf_action_dump(struct sk_buff *skb, struct list_head *actions, int bind, int ref) |
1da177e4 LT |
464 | { |
465 | struct tc_action *a; | |
466 | int err = -EINVAL; | |
4b3550ef | 467 | struct nlattr *nest; |
1da177e4 | 468 | |
33be6271 | 469 | list_for_each_entry(a, actions, list) { |
4b3550ef PM |
470 | nest = nla_nest_start(skb, a->order); |
471 | if (nest == NULL) | |
472 | goto nla_put_failure; | |
1da177e4 LT |
473 | err = tcf_action_dump_1(skb, a, bind, ref); |
474 | if (err < 0) | |
4fe683f5 | 475 | goto errout; |
4b3550ef | 476 | nla_nest_end(skb, nest); |
1da177e4 LT |
477 | } |
478 | ||
479 | return 0; | |
480 | ||
7ba699c6 | 481 | nla_put_failure: |
4fe683f5 TG |
482 | err = -EINVAL; |
483 | errout: | |
4b3550ef | 484 | nla_nest_cancel(skb, nest); |
4fe683f5 | 485 | return err; |
1da177e4 LT |
486 | } |
487 | ||
c1b52739 BL |
488 | struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla, |
489 | struct nlattr *est, char *name, int ovr, | |
490 | int bind) | |
1da177e4 LT |
491 | { |
492 | struct tc_action *a; | |
493 | struct tc_action_ops *a_o; | |
494 | char act_name[IFNAMSIZ]; | |
cc7ec456 | 495 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 496 | struct nlattr *kind; |
ab27cfb8 | 497 | int err; |
1da177e4 | 498 | |
1da177e4 | 499 | if (name == NULL) { |
cee63723 PM |
500 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
501 | if (err < 0) | |
1da177e4 | 502 | goto err_out; |
cee63723 | 503 | err = -EINVAL; |
7ba699c6 | 504 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
505 | if (kind == NULL) |
506 | goto err_out; | |
7ba699c6 | 507 | if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) |
1da177e4 LT |
508 | goto err_out; |
509 | } else { | |
cee63723 | 510 | err = -EINVAL; |
1da177e4 LT |
511 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) |
512 | goto err_out; | |
513 | } | |
514 | ||
515 | a_o = tc_lookup_action_n(act_name); | |
516 | if (a_o == NULL) { | |
95a5afca | 517 | #ifdef CONFIG_MODULES |
1da177e4 | 518 | rtnl_unlock(); |
4bba3925 | 519 | request_module("act_%s", act_name); |
1da177e4 LT |
520 | rtnl_lock(); |
521 | ||
522 | a_o = tc_lookup_action_n(act_name); | |
523 | ||
524 | /* We dropped the RTNL semaphore in order to | |
525 | * perform the module load. So, even if we | |
526 | * succeeded in loading the module we have to | |
527 | * tell the caller to replay the request. We | |
528 | * indicate this using -EAGAIN. | |
529 | */ | |
530 | if (a_o != NULL) { | |
ab27cfb8 | 531 | err = -EAGAIN; |
1da177e4 LT |
532 | goto err_mod; |
533 | } | |
534 | #endif | |
ab27cfb8 | 535 | err = -ENOENT; |
1da177e4 LT |
536 | goto err_out; |
537 | } | |
538 | ||
ab27cfb8 | 539 | err = -ENOMEM; |
0da974f4 | 540 | a = kzalloc(sizeof(*a), GFP_KERNEL); |
1da177e4 LT |
541 | if (a == NULL) |
542 | goto err_mod; | |
1da177e4 | 543 | |
33be6271 | 544 | INIT_LIST_HEAD(&a->list); |
1da177e4 LT |
545 | /* backward compatibility for policer */ |
546 | if (name == NULL) | |
c1b52739 | 547 | err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, a, ovr, bind); |
1da177e4 | 548 | else |
c1b52739 | 549 | err = a_o->init(net, nla, est, a, ovr, bind); |
ab27cfb8 | 550 | if (err < 0) |
1da177e4 LT |
551 | goto err_free; |
552 | ||
553 | /* module count goes up only when brand new policy is created | |
cc7ec456 ED |
554 | * if it exists and is only bound to in a_o->init() then |
555 | * ACT_P_CREATED is not returned (a zero is). | |
556 | */ | |
ab27cfb8 | 557 | if (err != ACT_P_CREATED) |
1da177e4 LT |
558 | module_put(a_o->owner); |
559 | a->ops = a_o; | |
1da177e4 | 560 | |
1da177e4 LT |
561 | return a; |
562 | ||
563 | err_free: | |
564 | kfree(a); | |
565 | err_mod: | |
566 | module_put(a_o->owner); | |
567 | err_out: | |
ab27cfb8 | 568 | return ERR_PTR(err); |
1da177e4 LT |
569 | } |
570 | ||
33be6271 | 571 | int tcf_action_init(struct net *net, struct nlattr *nla, |
c1b52739 | 572 | struct nlattr *est, char *name, int ovr, |
33be6271 | 573 | int bind, struct list_head *actions) |
1da177e4 | 574 | { |
cc7ec456 | 575 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 | 576 | struct tc_action *act; |
cee63723 | 577 | int err; |
1da177e4 LT |
578 | int i; |
579 | ||
cee63723 PM |
580 | err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
581 | if (err < 0) | |
33be6271 | 582 | return err; |
1da177e4 | 583 | |
7ba699c6 | 584 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
c1b52739 | 585 | act = tcf_action_init_1(net, tb[i], est, name, ovr, bind); |
33be6271 WC |
586 | if (IS_ERR(act)) { |
587 | err = PTR_ERR(act); | |
1da177e4 | 588 | goto err; |
33be6271 | 589 | } |
7ba699c6 | 590 | act->order = i; |
33be6271 | 591 | list_add_tail(&act->list, actions); |
1da177e4 | 592 | } |
33be6271 | 593 | return 0; |
1da177e4 LT |
594 | |
595 | err: | |
33be6271 WC |
596 | tcf_action_destroy(actions, bind); |
597 | return err; | |
1da177e4 LT |
598 | } |
599 | ||
600 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a, | |
601 | int compat_mode) | |
602 | { | |
603 | int err = 0; | |
604 | struct gnet_dump d; | |
605 | struct tcf_act_hdr *h = a->priv; | |
10297b99 | 606 | |
1da177e4 LT |
607 | if (h == NULL) |
608 | goto errout; | |
609 | ||
610 | /* compat_mode being true specifies a call that is supposed | |
06fe9fb4 | 611 | * to add additional backward compatibility statistic TLVs. |
1da177e4 LT |
612 | */ |
613 | if (compat_mode) { | |
614 | if (a->type == TCA_OLD_COMPAT) | |
615 | err = gnet_stats_start_copy_compat(skb, 0, | |
4bdf3991 | 616 | TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d); |
1da177e4 LT |
617 | else |
618 | return 0; | |
619 | } else | |
620 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
4bdf3991 | 621 | &h->tcf_lock, &d); |
1da177e4 LT |
622 | |
623 | if (err < 0) | |
624 | goto errout; | |
625 | ||
e9ce1cd3 | 626 | if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 || |
d250a5f9 ED |
627 | gnet_stats_copy_rate_est(&d, &h->tcf_bstats, |
628 | &h->tcf_rate_est) < 0 || | |
e9ce1cd3 | 629 | gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0) |
1da177e4 LT |
630 | goto errout; |
631 | ||
632 | if (gnet_stats_finish_copy(&d) < 0) | |
633 | goto errout; | |
634 | ||
635 | return 0; | |
636 | ||
637 | errout: | |
638 | return -1; | |
639 | } | |
640 | ||
641 | static int | |
33be6271 | 642 | tca_get_fill(struct sk_buff *skb, struct list_head *actions, u32 portid, u32 seq, |
10297b99 | 643 | u16 flags, int event, int bind, int ref) |
1da177e4 LT |
644 | { |
645 | struct tcamsg *t; | |
646 | struct nlmsghdr *nlh; | |
27a884dc | 647 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 648 | struct nlattr *nest; |
1da177e4 | 649 | |
15e47304 | 650 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags); |
8b00a53c DM |
651 | if (!nlh) |
652 | goto out_nlmsg_trim; | |
653 | t = nlmsg_data(nlh); | |
1da177e4 | 654 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
655 | t->tca__pad1 = 0; |
656 | t->tca__pad2 = 0; | |
10297b99 | 657 | |
4b3550ef PM |
658 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
659 | if (nest == NULL) | |
8b00a53c | 660 | goto out_nlmsg_trim; |
1da177e4 | 661 | |
33be6271 | 662 | if (tcf_action_dump(skb, actions, bind, ref) < 0) |
8b00a53c | 663 | goto out_nlmsg_trim; |
1da177e4 | 664 | |
4b3550ef | 665 | nla_nest_end(skb, nest); |
10297b99 | 666 | |
27a884dc | 667 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
668 | return skb->len; |
669 | ||
8b00a53c | 670 | out_nlmsg_trim: |
dc5fc579 | 671 | nlmsg_trim(skb, b); |
1da177e4 LT |
672 | return -1; |
673 | } | |
674 | ||
675 | static int | |
15e47304 | 676 | act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n, |
33be6271 | 677 | struct list_head *actions, int event) |
1da177e4 LT |
678 | { |
679 | struct sk_buff *skb; | |
1da177e4 LT |
680 | |
681 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
682 | if (!skb) | |
683 | return -ENOBUFS; | |
33be6271 | 684 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { |
1da177e4 LT |
685 | kfree_skb(skb); |
686 | return -EINVAL; | |
687 | } | |
2942e900 | 688 | |
15e47304 | 689 | return rtnl_unicast(skb, net, portid); |
1da177e4 LT |
690 | } |
691 | ||
692 | static struct tc_action * | |
15e47304 | 693 | tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 portid) |
1da177e4 | 694 | { |
cc7ec456 | 695 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
1da177e4 LT |
696 | struct tc_action *a; |
697 | int index; | |
ab27cfb8 | 698 | int err; |
1da177e4 | 699 | |
cee63723 PM |
700 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
701 | if (err < 0) | |
ab27cfb8 | 702 | goto err_out; |
1da177e4 | 703 | |
cee63723 | 704 | err = -EINVAL; |
7ba699c6 PM |
705 | if (tb[TCA_ACT_INDEX] == NULL || |
706 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) | |
ab27cfb8 | 707 | goto err_out; |
1587bac4 | 708 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 709 | |
ab27cfb8 | 710 | err = -ENOMEM; |
0da974f4 | 711 | a = kzalloc(sizeof(struct tc_action), GFP_KERNEL); |
1da177e4 | 712 | if (a == NULL) |
ab27cfb8 | 713 | goto err_out; |
1da177e4 | 714 | |
33be6271 | 715 | INIT_LIST_HEAD(&a->list); |
ab27cfb8 | 716 | err = -EINVAL; |
7ba699c6 | 717 | a->ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
1da177e4 LT |
718 | if (a->ops == NULL) |
719 | goto err_free; | |
ab27cfb8 | 720 | err = -ENOENT; |
1da177e4 LT |
721 | if (a->ops->lookup(a, index) == 0) |
722 | goto err_mod; | |
723 | ||
724 | module_put(a->ops->owner); | |
1da177e4 | 725 | return a; |
ab27cfb8 | 726 | |
1da177e4 LT |
727 | err_mod: |
728 | module_put(a->ops->owner); | |
729 | err_free: | |
730 | kfree(a); | |
ab27cfb8 PM |
731 | err_out: |
732 | return ERR_PTR(err); | |
1da177e4 LT |
733 | } |
734 | ||
33be6271 | 735 | static void cleanup_a(struct list_head *actions) |
1da177e4 | 736 | { |
33be6271 | 737 | struct tc_action *a, *tmp; |
1da177e4 | 738 | |
33be6271 WC |
739 | list_for_each_entry_safe(a, tmp, actions, list) { |
740 | list_del(&a->list); | |
1da177e4 LT |
741 | kfree(a); |
742 | } | |
743 | } | |
744 | ||
745 | static struct tc_action *create_a(int i) | |
746 | { | |
747 | struct tc_action *act; | |
748 | ||
0da974f4 | 749 | act = kzalloc(sizeof(*act), GFP_KERNEL); |
1da177e4 | 750 | if (act == NULL) { |
6ff9c364 | 751 | pr_debug("create_a: failed to alloc!\n"); |
1da177e4 LT |
752 | return NULL; |
753 | } | |
1da177e4 | 754 | act->order = i; |
33be6271 | 755 | INIT_LIST_HEAD(&act->list); |
1da177e4 LT |
756 | return act; |
757 | } | |
758 | ||
7316ae88 | 759 | static int tca_action_flush(struct net *net, struct nlattr *nla, |
15e47304 | 760 | struct nlmsghdr *n, u32 portid) |
1da177e4 LT |
761 | { |
762 | struct sk_buff *skb; | |
763 | unsigned char *b; | |
764 | struct nlmsghdr *nlh; | |
765 | struct tcamsg *t; | |
766 | struct netlink_callback dcb; | |
4b3550ef | 767 | struct nlattr *nest; |
cc7ec456 | 768 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 769 | struct nlattr *kind; |
1da177e4 | 770 | struct tc_action *a = create_a(0); |
36723873 | 771 | int err = -ENOMEM; |
1da177e4 LT |
772 | |
773 | if (a == NULL) { | |
6ff9c364 | 774 | pr_debug("tca_action_flush: couldnt create tc_action\n"); |
1da177e4 LT |
775 | return err; |
776 | } | |
777 | ||
778 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
779 | if (!skb) { | |
6ff9c364 | 780 | pr_debug("tca_action_flush: failed skb alloc\n"); |
1da177e4 | 781 | kfree(a); |
36723873 | 782 | return err; |
1da177e4 LT |
783 | } |
784 | ||
27a884dc | 785 | b = skb_tail_pointer(skb); |
1da177e4 | 786 | |
cee63723 PM |
787 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
788 | if (err < 0) | |
1da177e4 LT |
789 | goto err_out; |
790 | ||
cee63723 | 791 | err = -EINVAL; |
7ba699c6 | 792 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
793 | a->ops = tc_lookup_action(kind); |
794 | if (a->ops == NULL) | |
795 | goto err_out; | |
796 | ||
15e47304 | 797 | nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t), 0); |
8b00a53c DM |
798 | if (!nlh) |
799 | goto out_module_put; | |
800 | t = nlmsg_data(nlh); | |
1da177e4 | 801 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
802 | t->tca__pad1 = 0; |
803 | t->tca__pad2 = 0; | |
1da177e4 | 804 | |
4b3550ef PM |
805 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
806 | if (nest == NULL) | |
8b00a53c | 807 | goto out_module_put; |
1da177e4 LT |
808 | |
809 | err = a->ops->walk(skb, &dcb, RTM_DELACTION, a); | |
810 | if (err < 0) | |
8b00a53c | 811 | goto out_module_put; |
f97017cd JHS |
812 | if (err == 0) |
813 | goto noflush_out; | |
1da177e4 | 814 | |
4b3550ef | 815 | nla_nest_end(skb, nest); |
1da177e4 | 816 | |
27a884dc | 817 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
818 | nlh->nlmsg_flags |= NLM_F_ROOT; |
819 | module_put(a->ops->owner); | |
820 | kfree(a); | |
15e47304 | 821 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 822 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
823 | if (err > 0) |
824 | return 0; | |
825 | ||
826 | return err; | |
827 | ||
8b00a53c | 828 | out_module_put: |
ebbaeab1 | 829 | module_put(a->ops->owner); |
1da177e4 | 830 | err_out: |
f97017cd | 831 | noflush_out: |
1da177e4 LT |
832 | kfree_skb(skb); |
833 | kfree(a); | |
834 | return err; | |
835 | } | |
836 | ||
837 | static int | |
7316ae88 | 838 | tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
15e47304 | 839 | u32 portid, int event) |
1da177e4 | 840 | { |
cee63723 | 841 | int i, ret; |
cc7ec456 | 842 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 WC |
843 | struct tc_action *act; |
844 | LIST_HEAD(actions); | |
1da177e4 | 845 | |
cee63723 PM |
846 | ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
847 | if (ret < 0) | |
848 | return ret; | |
1da177e4 | 849 | |
cc7ec456 | 850 | if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) { |
f97017cd | 851 | if (tb[1] != NULL) |
15e47304 | 852 | return tca_action_flush(net, tb[1], n, portid); |
f97017cd JHS |
853 | else |
854 | return -EINVAL; | |
1da177e4 LT |
855 | } |
856 | ||
7ba699c6 | 857 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
15e47304 | 858 | act = tcf_action_get_1(tb[i], n, portid); |
ab27cfb8 PM |
859 | if (IS_ERR(act)) { |
860 | ret = PTR_ERR(act); | |
1da177e4 | 861 | goto err; |
ab27cfb8 | 862 | } |
7ba699c6 | 863 | act->order = i; |
33be6271 | 864 | list_add_tail(&act->list, &actions); |
1da177e4 LT |
865 | } |
866 | ||
867 | if (event == RTM_GETACTION) | |
33be6271 | 868 | ret = act_get_notify(net, portid, n, &actions, event); |
1da177e4 LT |
869 | else { /* delete */ |
870 | struct sk_buff *skb; | |
871 | ||
872 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
873 | if (!skb) { | |
874 | ret = -ENOBUFS; | |
875 | goto err; | |
876 | } | |
877 | ||
33be6271 | 878 | if (tca_get_fill(skb, &actions, portid, n->nlmsg_seq, 0, event, |
10297b99 | 879 | 0, 1) <= 0) { |
1da177e4 LT |
880 | kfree_skb(skb); |
881 | ret = -EINVAL; | |
882 | goto err; | |
883 | } | |
884 | ||
885 | /* now do the delete */ | |
33be6271 | 886 | tcf_action_destroy(&actions, 0); |
15e47304 | 887 | ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 888 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
889 | if (ret > 0) |
890 | return 0; | |
891 | return ret; | |
892 | } | |
893 | err: | |
33be6271 | 894 | cleanup_a(&actions); |
1da177e4 LT |
895 | return ret; |
896 | } | |
897 | ||
33be6271 | 898 | static int tcf_add_notify(struct net *net, struct list_head *actions, |
15e47304 | 899 | u32 portid, u32 seq, int event, u16 flags) |
1da177e4 LT |
900 | { |
901 | struct tcamsg *t; | |
902 | struct nlmsghdr *nlh; | |
903 | struct sk_buff *skb; | |
4b3550ef | 904 | struct nlattr *nest; |
1da177e4 LT |
905 | unsigned char *b; |
906 | int err = 0; | |
907 | ||
908 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
909 | if (!skb) | |
910 | return -ENOBUFS; | |
911 | ||
27a884dc | 912 | b = skb_tail_pointer(skb); |
1da177e4 | 913 | |
15e47304 | 914 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags); |
8b00a53c DM |
915 | if (!nlh) |
916 | goto out_kfree_skb; | |
917 | t = nlmsg_data(nlh); | |
1da177e4 | 918 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
919 | t->tca__pad1 = 0; |
920 | t->tca__pad2 = 0; | |
921 | ||
4b3550ef PM |
922 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
923 | if (nest == NULL) | |
8b00a53c | 924 | goto out_kfree_skb; |
1da177e4 | 925 | |
33be6271 | 926 | if (tcf_action_dump(skb, actions, 0, 0) < 0) |
8b00a53c | 927 | goto out_kfree_skb; |
1da177e4 | 928 | |
4b3550ef | 929 | nla_nest_end(skb, nest); |
10297b99 | 930 | |
27a884dc | 931 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
ac6d439d | 932 | NETLINK_CB(skb).dst_group = RTNLGRP_TC; |
10297b99 | 933 | |
15e47304 | 934 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO); |
1da177e4 LT |
935 | if (err > 0) |
936 | err = 0; | |
937 | return err; | |
938 | ||
8b00a53c | 939 | out_kfree_skb: |
f6e57464 | 940 | kfree_skb(skb); |
1da177e4 LT |
941 | return -1; |
942 | } | |
943 | ||
10297b99 | 944 | |
1da177e4 | 945 | static int |
7316ae88 | 946 | tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
15e47304 | 947 | u32 portid, int ovr) |
1da177e4 LT |
948 | { |
949 | int ret = 0; | |
33be6271 | 950 | LIST_HEAD(actions); |
1da177e4 LT |
951 | u32 seq = n->nlmsg_seq; |
952 | ||
33be6271 WC |
953 | ret = tcf_action_init(net, nla, NULL, NULL, ovr, 0, &actions); |
954 | if (ret) | |
ab27cfb8 | 955 | goto done; |
1da177e4 LT |
956 | |
957 | /* dump then free all the actions after update; inserted policy | |
958 | * stays intact | |
cc7ec456 | 959 | */ |
33be6271 WC |
960 | ret = tcf_add_notify(net, &actions, portid, seq, RTM_NEWACTION, n->nlmsg_flags); |
961 | cleanup_a(&actions); | |
1da177e4 LT |
962 | done: |
963 | return ret; | |
964 | } | |
965 | ||
661d2967 | 966 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 967 | { |
3b1e0a65 | 968 | struct net *net = sock_net(skb->sk); |
7ba699c6 | 969 | struct nlattr *tca[TCA_ACT_MAX + 1]; |
15e47304 | 970 | u32 portid = skb ? NETLINK_CB(skb).portid : 0; |
1da177e4 LT |
971 | int ret = 0, ovr = 0; |
972 | ||
dfc47ef8 EB |
973 | if ((n->nlmsg_type != RTM_GETACTION) && !capable(CAP_NET_ADMIN)) |
974 | return -EPERM; | |
975 | ||
7ba699c6 PM |
976 | ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL); |
977 | if (ret < 0) | |
978 | return ret; | |
979 | ||
980 | if (tca[TCA_ACT_TAB] == NULL) { | |
6ff9c364 | 981 | pr_notice("tc_ctl_action: received NO action attribs\n"); |
1da177e4 LT |
982 | return -EINVAL; |
983 | } | |
984 | ||
cc7ec456 | 985 | /* n->nlmsg_flags & NLM_F_CREATE */ |
1da177e4 LT |
986 | switch (n->nlmsg_type) { |
987 | case RTM_NEWACTION: | |
988 | /* we are going to assume all other flags | |
25985edc | 989 | * imply create only if it doesn't exist |
1da177e4 LT |
990 | * Note that CREATE | EXCL implies that |
991 | * but since we want avoid ambiguity (eg when flags | |
992 | * is zero) then just set this | |
993 | */ | |
cc7ec456 | 994 | if (n->nlmsg_flags & NLM_F_REPLACE) |
1da177e4 LT |
995 | ovr = 1; |
996 | replay: | |
15e47304 | 997 | ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr); |
1da177e4 LT |
998 | if (ret == -EAGAIN) |
999 | goto replay; | |
1000 | break; | |
1001 | case RTM_DELACTION: | |
7316ae88 | 1002 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
15e47304 | 1003 | portid, RTM_DELACTION); |
1da177e4 LT |
1004 | break; |
1005 | case RTM_GETACTION: | |
7316ae88 | 1006 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
15e47304 | 1007 | portid, RTM_GETACTION); |
1da177e4 LT |
1008 | break; |
1009 | default: | |
1010 | BUG(); | |
1011 | } | |
1012 | ||
1013 | return ret; | |
1014 | } | |
1015 | ||
7ba699c6 | 1016 | static struct nlattr * |
3a6c2b41 | 1017 | find_dump_kind(const struct nlmsghdr *n) |
1da177e4 | 1018 | { |
cc7ec456 | 1019 | struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1]; |
7ba699c6 PM |
1020 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
1021 | struct nlattr *nla[TCAA_MAX + 1]; | |
1022 | struct nlattr *kind; | |
1da177e4 | 1023 | |
c96c9471 | 1024 | if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0) |
1da177e4 | 1025 | return NULL; |
7ba699c6 | 1026 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
1027 | if (tb1 == NULL) |
1028 | return NULL; | |
1029 | ||
7ba699c6 PM |
1030 | if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), |
1031 | NLMSG_ALIGN(nla_len(tb1)), NULL) < 0) | |
1da177e4 | 1032 | return NULL; |
1da177e4 | 1033 | |
6d834e04 PM |
1034 | if (tb[1] == NULL) |
1035 | return NULL; | |
1036 | if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]), | |
1037 | nla_len(tb[1]), NULL) < 0) | |
1da177e4 | 1038 | return NULL; |
7ba699c6 | 1039 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 1040 | |
26dab893 | 1041 | return kind; |
1da177e4 LT |
1042 | } |
1043 | ||
1044 | static int | |
1045 | tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) | |
1046 | { | |
1047 | struct nlmsghdr *nlh; | |
27a884dc | 1048 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1049 | struct nlattr *nest; |
1da177e4 LT |
1050 | struct tc_action_ops *a_o; |
1051 | struct tc_action a; | |
1052 | int ret = 0; | |
8b00a53c | 1053 | struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh); |
7ba699c6 | 1054 | struct nlattr *kind = find_dump_kind(cb->nlh); |
1da177e4 LT |
1055 | |
1056 | if (kind == NULL) { | |
6ff9c364 | 1057 | pr_info("tc_dump_action: action bad kind\n"); |
1da177e4 LT |
1058 | return 0; |
1059 | } | |
1060 | ||
26dab893 | 1061 | a_o = tc_lookup_action(kind); |
cc7ec456 | 1062 | if (a_o == NULL) |
1da177e4 | 1063 | return 0; |
1da177e4 LT |
1064 | |
1065 | memset(&a, 0, sizeof(struct tc_action)); | |
1066 | a.ops = a_o; | |
1067 | ||
15e47304 | 1068 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
8b00a53c DM |
1069 | cb->nlh->nlmsg_type, sizeof(*t), 0); |
1070 | if (!nlh) | |
1071 | goto out_module_put; | |
1072 | t = nlmsg_data(nlh); | |
1da177e4 | 1073 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1074 | t->tca__pad1 = 0; |
1075 | t->tca__pad2 = 0; | |
1da177e4 | 1076 | |
4b3550ef PM |
1077 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
1078 | if (nest == NULL) | |
8b00a53c | 1079 | goto out_module_put; |
1da177e4 LT |
1080 | |
1081 | ret = a_o->walk(skb, cb, RTM_GETACTION, &a); | |
1082 | if (ret < 0) | |
8b00a53c | 1083 | goto out_module_put; |
1da177e4 LT |
1084 | |
1085 | if (ret > 0) { | |
4b3550ef | 1086 | nla_nest_end(skb, nest); |
1da177e4 LT |
1087 | ret = skb->len; |
1088 | } else | |
4b3550ef | 1089 | nla_nest_cancel(skb, nest); |
1da177e4 | 1090 | |
27a884dc | 1091 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
15e47304 | 1092 | if (NETLINK_CB(cb->skb).portid && ret) |
1da177e4 LT |
1093 | nlh->nlmsg_flags |= NLM_F_MULTI; |
1094 | module_put(a_o->owner); | |
1095 | return skb->len; | |
1096 | ||
8b00a53c | 1097 | out_module_put: |
1da177e4 | 1098 | module_put(a_o->owner); |
dc5fc579 | 1099 | nlmsg_trim(skb, b); |
1da177e4 LT |
1100 | return skb->len; |
1101 | } | |
1102 | ||
1103 | static int __init tc_action_init(void) | |
1104 | { | |
c7ac8679 GR |
1105 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL); |
1106 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL); | |
1107 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, | |
1108 | NULL); | |
1da177e4 | 1109 | |
1da177e4 LT |
1110 | return 0; |
1111 | } | |
1112 | ||
1113 | subsys_initcall(tc_action_init); |