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 | { | |
32 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); | |
33 | struct tcf_common **p1p; | |
34 | ||
35 | for (p1p = &hinfo->htab[h]; *p1p; p1p = &(*p1p)->tcfc_next) { | |
36 | if (*p1p == p) { | |
37 | write_lock_bh(hinfo->lock); | |
38 | *p1p = p->tcfc_next; | |
39 | write_unlock_bh(hinfo->lock); | |
e9ce1cd3 DM |
40 | gen_kill_estimator(&p->tcfc_bstats, |
41 | &p->tcfc_rate_est); | |
c7de2cf0 ED |
42 | /* |
43 | * gen_estimator est_timer() might access p->tcfc_lock | |
44 | * or bstats, wait a RCU grace period before freeing p | |
45 | */ | |
f5c8593c | 46 | kfree_rcu(p, tcfc_rcu); |
e9ce1cd3 DM |
47 | return; |
48 | } | |
49 | } | |
547b792c | 50 | WARN_ON(1); |
e9ce1cd3 DM |
51 | } |
52 | EXPORT_SYMBOL(tcf_hash_destroy); | |
53 | ||
54 | int tcf_hash_release(struct tcf_common *p, int bind, | |
55 | struct tcf_hashinfo *hinfo) | |
56 | { | |
57 | int ret = 0; | |
58 | ||
59 | if (p) { | |
60 | if (bind) | |
61 | p->tcfc_bindcnt--; | |
62 | ||
63 | p->tcfc_refcnt--; | |
10297b99 | 64 | if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) { |
e9ce1cd3 DM |
65 | tcf_hash_destroy(p, hinfo); |
66 | ret = 1; | |
67 | } | |
68 | } | |
69 | return ret; | |
70 | } | |
71 | EXPORT_SYMBOL(tcf_hash_release); | |
72 | ||
73 | static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
74 | struct tc_action *a, struct tcf_hashinfo *hinfo) | |
75 | { | |
76 | struct tcf_common *p; | |
cc7ec456 | 77 | int err = 0, index = -1, i = 0, s_i = 0, n_i = 0; |
4b3550ef | 78 | struct nlattr *nest; |
e9ce1cd3 | 79 | |
e1e992e5 | 80 | read_lock_bh(hinfo->lock); |
e9ce1cd3 DM |
81 | |
82 | s_i = cb->args[0]; | |
83 | ||
84 | for (i = 0; i < (hinfo->hmask + 1); i++) { | |
85 | p = hinfo->htab[tcf_hash(i, hinfo->hmask)]; | |
86 | ||
87 | for (; p; p = p->tcfc_next) { | |
88 | index++; | |
89 | if (index < s_i) | |
90 | continue; | |
91 | a->priv = p; | |
92 | a->order = n_i; | |
4b3550ef PM |
93 | |
94 | nest = nla_nest_start(skb, a->order); | |
95 | if (nest == NULL) | |
96 | goto nla_put_failure; | |
e9ce1cd3 DM |
97 | err = tcf_action_dump_1(skb, a, 0, 0); |
98 | if (err < 0) { | |
99 | index--; | |
4b3550ef | 100 | nlmsg_trim(skb, nest); |
e9ce1cd3 DM |
101 | goto done; |
102 | } | |
4b3550ef | 103 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
104 | n_i++; |
105 | if (n_i >= TCA_ACT_MAX_PRIO) | |
106 | goto done; | |
107 | } | |
108 | } | |
109 | done: | |
e1e992e5 | 110 | read_unlock_bh(hinfo->lock); |
e9ce1cd3 DM |
111 | if (n_i) |
112 | cb->args[0] += n_i; | |
113 | return n_i; | |
114 | ||
7ba699c6 | 115 | nla_put_failure: |
4b3550ef | 116 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
117 | goto done; |
118 | } | |
119 | ||
120 | static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a, | |
121 | struct tcf_hashinfo *hinfo) | |
122 | { | |
123 | struct tcf_common *p, *s_p; | |
4b3550ef | 124 | struct nlattr *nest; |
cc7ec456 | 125 | int i = 0, n_i = 0; |
e9ce1cd3 | 126 | |
4b3550ef PM |
127 | nest = nla_nest_start(skb, a->order); |
128 | if (nest == NULL) | |
129 | goto nla_put_failure; | |
1b34ec43 DM |
130 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) |
131 | goto nla_put_failure; | |
e9ce1cd3 DM |
132 | for (i = 0; i < (hinfo->hmask + 1); i++) { |
133 | p = hinfo->htab[tcf_hash(i, hinfo->hmask)]; | |
134 | ||
135 | while (p != NULL) { | |
136 | s_p = p->tcfc_next; | |
137 | if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo)) | |
cc7ec456 | 138 | module_put(a->ops->owner); |
e9ce1cd3 DM |
139 | n_i++; |
140 | p = s_p; | |
141 | } | |
142 | } | |
1b34ec43 DM |
143 | if (nla_put_u32(skb, TCA_FCNT, n_i)) |
144 | goto nla_put_failure; | |
4b3550ef | 145 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
146 | |
147 | return n_i; | |
7ba699c6 | 148 | nla_put_failure: |
4b3550ef | 149 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
150 | return -EINVAL; |
151 | } | |
152 | ||
153 | int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
154 | int type, struct tc_action *a) | |
155 | { | |
156 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
157 | ||
158 | if (type == RTM_DELACTION) { | |
159 | return tcf_del_walker(skb, a, hinfo); | |
160 | } else if (type == RTM_GETACTION) { | |
161 | return tcf_dump_walker(skb, cb, a, hinfo); | |
162 | } else { | |
6ff9c364 | 163 | WARN(1, "tcf_generic_walker: unknown action %d\n", type); |
e9ce1cd3 DM |
164 | return -EINVAL; |
165 | } | |
166 | } | |
167 | EXPORT_SYMBOL(tcf_generic_walker); | |
168 | ||
169 | struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo) | |
170 | { | |
171 | struct tcf_common *p; | |
172 | ||
e1e992e5 | 173 | read_lock_bh(hinfo->lock); |
e9ce1cd3 DM |
174 | for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p; |
175 | p = p->tcfc_next) { | |
176 | if (p->tcfc_index == index) | |
177 | break; | |
178 | } | |
e1e992e5 | 179 | read_unlock_bh(hinfo->lock); |
e9ce1cd3 DM |
180 | |
181 | return p; | |
182 | } | |
183 | EXPORT_SYMBOL(tcf_hash_lookup); | |
184 | ||
185 | u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo) | |
186 | { | |
187 | u32 val = *idx_gen; | |
188 | ||
189 | do { | |
190 | if (++val == 0) | |
191 | val = 1; | |
192 | } while (tcf_hash_lookup(val, hinfo)); | |
193 | ||
194 | return (*idx_gen = val); | |
195 | } | |
196 | EXPORT_SYMBOL(tcf_hash_new_index); | |
197 | ||
198 | int tcf_hash_search(struct tc_action *a, u32 index) | |
199 | { | |
200 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
201 | struct tcf_common *p = tcf_hash_lookup(index, hinfo); | |
202 | ||
203 | if (p) { | |
204 | a->priv = p; | |
205 | return 1; | |
206 | } | |
207 | return 0; | |
208 | } | |
209 | EXPORT_SYMBOL(tcf_hash_search); | |
210 | ||
211 | struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind, | |
212 | struct tcf_hashinfo *hinfo) | |
213 | { | |
214 | struct tcf_common *p = NULL; | |
215 | if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) { | |
76aab2c1 | 216 | if (bind) |
e9ce1cd3 | 217 | p->tcfc_bindcnt++; |
76aab2c1 | 218 | p->tcfc_refcnt++; |
e9ce1cd3 DM |
219 | a->priv = p; |
220 | } | |
221 | return p; | |
222 | } | |
223 | EXPORT_SYMBOL(tcf_hash_check); | |
224 | ||
0e991ec6 SH |
225 | struct tcf_common *tcf_hash_create(u32 index, struct nlattr *est, |
226 | struct tc_action *a, int size, int bind, | |
227 | u32 *idx_gen, struct tcf_hashinfo *hinfo) | |
e9ce1cd3 DM |
228 | { |
229 | struct tcf_common *p = kzalloc(size, GFP_KERNEL); | |
230 | ||
231 | if (unlikely(!p)) | |
0e991ec6 | 232 | return ERR_PTR(-ENOMEM); |
e9ce1cd3 DM |
233 | p->tcfc_refcnt = 1; |
234 | if (bind) | |
235 | p->tcfc_bindcnt = 1; | |
236 | ||
237 | spin_lock_init(&p->tcfc_lock); | |
e9ce1cd3 DM |
238 | p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo); |
239 | p->tcfc_tm.install = jiffies; | |
240 | p->tcfc_tm.lastuse = jiffies; | |
0e991ec6 SH |
241 | if (est) { |
242 | int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est, | |
243 | &p->tcfc_lock, est); | |
244 | if (err) { | |
245 | kfree(p); | |
246 | return ERR_PTR(err); | |
247 | } | |
248 | } | |
249 | ||
e9ce1cd3 DM |
250 | a->priv = (void *) p; |
251 | return p; | |
252 | } | |
253 | EXPORT_SYMBOL(tcf_hash_create); | |
254 | ||
255 | void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo) | |
256 | { | |
257 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); | |
258 | ||
259 | write_lock_bh(hinfo->lock); | |
260 | p->tcfc_next = hinfo->htab[h]; | |
261 | hinfo->htab[h] = p; | |
262 | write_unlock_bh(hinfo->lock); | |
263 | } | |
264 | EXPORT_SYMBOL(tcf_hash_insert); | |
1da177e4 LT |
265 | |
266 | static struct tc_action_ops *act_base = NULL; | |
267 | static DEFINE_RWLOCK(act_mod_lock); | |
268 | ||
269 | int tcf_register_action(struct tc_action_ops *act) | |
270 | { | |
271 | struct tc_action_ops *a, **ap; | |
272 | ||
76c82d7a JHS |
273 | /* Must supply act, dump, cleanup and init */ |
274 | if (!act->act || !act->dump || !act->cleanup || !act->init) | |
275 | return -EINVAL; | |
276 | ||
382ca8a1 | 277 | /* Supply defaults */ |
63ef6174 JHS |
278 | if (!act->lookup) |
279 | act->lookup = tcf_hash_search; | |
382ca8a1 JHS |
280 | if (!act->walk) |
281 | act->walk = tcf_generic_walker; | |
63ef6174 | 282 | |
1da177e4 LT |
283 | write_lock(&act_mod_lock); |
284 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) { | |
285 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { | |
286 | write_unlock(&act_mod_lock); | |
287 | return -EEXIST; | |
288 | } | |
289 | } | |
290 | act->next = NULL; | |
291 | *ap = act; | |
292 | write_unlock(&act_mod_lock); | |
293 | return 0; | |
294 | } | |
62e3ba1b | 295 | EXPORT_SYMBOL(tcf_register_action); |
1da177e4 LT |
296 | |
297 | int tcf_unregister_action(struct tc_action_ops *act) | |
298 | { | |
299 | struct tc_action_ops *a, **ap; | |
300 | int err = -ENOENT; | |
301 | ||
302 | write_lock(&act_mod_lock); | |
303 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) | |
304 | if (a == act) | |
305 | break; | |
306 | if (a) { | |
307 | *ap = a->next; | |
308 | a->next = NULL; | |
309 | err = 0; | |
310 | } | |
311 | write_unlock(&act_mod_lock); | |
312 | return err; | |
313 | } | |
62e3ba1b | 314 | EXPORT_SYMBOL(tcf_unregister_action); |
1da177e4 LT |
315 | |
316 | /* lookup by name */ | |
317 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
318 | { | |
319 | struct tc_action_ops *a = NULL; | |
320 | ||
321 | if (kind) { | |
322 | read_lock(&act_mod_lock); | |
323 | for (a = act_base; a; a = a->next) { | |
324 | if (strcmp(kind, a->kind) == 0) { | |
325 | if (!try_module_get(a->owner)) { | |
326 | read_unlock(&act_mod_lock); | |
327 | return NULL; | |
328 | } | |
329 | break; | |
330 | } | |
331 | } | |
332 | read_unlock(&act_mod_lock); | |
333 | } | |
334 | return a; | |
335 | } | |
336 | ||
7ba699c6 PM |
337 | /* lookup by nlattr */ |
338 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) | |
1da177e4 LT |
339 | { |
340 | struct tc_action_ops *a = NULL; | |
341 | ||
342 | if (kind) { | |
343 | read_lock(&act_mod_lock); | |
344 | for (a = act_base; a; a = a->next) { | |
7ba699c6 | 345 | if (nla_strcmp(kind, a->kind) == 0) { |
1da177e4 LT |
346 | if (!try_module_get(a->owner)) { |
347 | read_unlock(&act_mod_lock); | |
348 | return NULL; | |
349 | } | |
350 | break; | |
351 | } | |
352 | } | |
353 | read_unlock(&act_mod_lock); | |
354 | } | |
355 | return a; | |
356 | } | |
357 | ||
358 | #if 0 | |
359 | /* lookup by id */ | |
360 | static struct tc_action_ops *tc_lookup_action_id(u32 type) | |
361 | { | |
362 | struct tc_action_ops *a = NULL; | |
363 | ||
364 | if (type) { | |
365 | read_lock(&act_mod_lock); | |
366 | for (a = act_base; a; a = a->next) { | |
367 | if (a->type == type) { | |
368 | if (!try_module_get(a->owner)) { | |
369 | read_unlock(&act_mod_lock); | |
370 | return NULL; | |
371 | } | |
372 | break; | |
373 | } | |
374 | } | |
375 | read_unlock(&act_mod_lock); | |
376 | } | |
377 | return a; | |
378 | } | |
379 | #endif | |
380 | ||
dc7f9f6e | 381 | int tcf_action_exec(struct sk_buff *skb, const struct tc_action *act, |
10297b99 | 382 | struct tcf_result *res) |
1da177e4 | 383 | { |
dc7f9f6e | 384 | const struct tc_action *a; |
1da177e4 LT |
385 | int ret = -1; |
386 | ||
387 | if (skb->tc_verd & TC_NCLS) { | |
388 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
1da177e4 LT |
389 | ret = TC_ACT_OK; |
390 | goto exec_done; | |
391 | } | |
392 | while ((a = act) != NULL) { | |
393 | repeat: | |
76c82d7a | 394 | if (a->ops) { |
f43c5a0d | 395 | ret = a->ops->act(skb, a, res); |
1da177e4 LT |
396 | if (TC_MUNGED & skb->tc_verd) { |
397 | /* copied already, allow trampling */ | |
398 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); | |
399 | skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd); | |
400 | } | |
1da177e4 LT |
401 | if (ret == TC_ACT_REPEAT) |
402 | goto repeat; /* we need a ttl - JHS */ | |
14d50e78 HS |
403 | if (ret != TC_ACT_PIPE) |
404 | goto exec_done; | |
1da177e4 LT |
405 | } |
406 | act = a->next; | |
407 | } | |
408 | exec_done: | |
1da177e4 LT |
409 | return ret; |
410 | } | |
62e3ba1b | 411 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 LT |
412 | |
413 | void tcf_action_destroy(struct tc_action *act, int bind) | |
414 | { | |
415 | struct tc_action *a; | |
416 | ||
417 | for (a = act; a; a = act) { | |
76c82d7a | 418 | if (a->ops) { |
1da177e4 LT |
419 | if (a->ops->cleanup(a, bind) == ACT_P_DELETED) |
420 | module_put(a->ops->owner); | |
421 | act = act->next; | |
422 | kfree(a); | |
6ff9c364 | 423 | } else { |
424 | /*FIXME: Remove later - catch insertion bugs*/ | |
425 | WARN(1, "tcf_action_destroy: BUG? destroying NULL ops\n"); | |
1da177e4 LT |
426 | act = act->next; |
427 | kfree(a); | |
428 | } | |
429 | } | |
430 | } | |
431 | ||
432 | int | |
433 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
434 | { | |
435 | int err = -EINVAL; | |
436 | ||
76c82d7a | 437 | if (a->ops == NULL) |
1da177e4 LT |
438 | return err; |
439 | return a->ops->dump(skb, a, bind, ref); | |
440 | } | |
441 | ||
442 | int | |
443 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
444 | { | |
445 | int err = -EINVAL; | |
27a884dc | 446 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 447 | struct nlattr *nest; |
1da177e4 | 448 | |
76c82d7a | 449 | if (a->ops == NULL) |
1da177e4 LT |
450 | return err; |
451 | ||
1b34ec43 DM |
452 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) |
453 | goto nla_put_failure; | |
1da177e4 | 454 | if (tcf_action_copy_stats(skb, a, 0)) |
7ba699c6 | 455 | goto nla_put_failure; |
4b3550ef PM |
456 | nest = nla_nest_start(skb, TCA_OPTIONS); |
457 | if (nest == NULL) | |
458 | goto nla_put_failure; | |
cc7ec456 ED |
459 | err = tcf_action_dump_old(skb, a, bind, ref); |
460 | if (err > 0) { | |
4b3550ef | 461 | nla_nest_end(skb, nest); |
1da177e4 LT |
462 | return err; |
463 | } | |
464 | ||
7ba699c6 | 465 | nla_put_failure: |
dc5fc579 | 466 | nlmsg_trim(skb, b); |
1da177e4 LT |
467 | return -1; |
468 | } | |
62e3ba1b | 469 | EXPORT_SYMBOL(tcf_action_dump_1); |
1da177e4 LT |
470 | |
471 | int | |
472 | tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref) | |
473 | { | |
474 | struct tc_action *a; | |
475 | int err = -EINVAL; | |
4b3550ef | 476 | struct nlattr *nest; |
1da177e4 LT |
477 | |
478 | while ((a = act) != NULL) { | |
1da177e4 | 479 | act = a->next; |
4b3550ef PM |
480 | nest = nla_nest_start(skb, a->order); |
481 | if (nest == NULL) | |
482 | goto nla_put_failure; | |
1da177e4 LT |
483 | err = tcf_action_dump_1(skb, a, bind, ref); |
484 | if (err < 0) | |
4fe683f5 | 485 | goto errout; |
4b3550ef | 486 | nla_nest_end(skb, nest); |
1da177e4 LT |
487 | } |
488 | ||
489 | return 0; | |
490 | ||
7ba699c6 | 491 | nla_put_failure: |
4fe683f5 TG |
492 | err = -EINVAL; |
493 | errout: | |
4b3550ef | 494 | nla_nest_cancel(skb, nest); |
4fe683f5 | 495 | return err; |
1da177e4 LT |
496 | } |
497 | ||
c1b52739 BL |
498 | struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla, |
499 | struct nlattr *est, char *name, int ovr, | |
500 | int bind) | |
1da177e4 LT |
501 | { |
502 | struct tc_action *a; | |
503 | struct tc_action_ops *a_o; | |
504 | char act_name[IFNAMSIZ]; | |
cc7ec456 | 505 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 506 | struct nlattr *kind; |
ab27cfb8 | 507 | int err; |
1da177e4 | 508 | |
1da177e4 | 509 | if (name == NULL) { |
cee63723 PM |
510 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
511 | if (err < 0) | |
1da177e4 | 512 | goto err_out; |
cee63723 | 513 | err = -EINVAL; |
7ba699c6 | 514 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
515 | if (kind == NULL) |
516 | goto err_out; | |
7ba699c6 | 517 | if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) |
1da177e4 LT |
518 | goto err_out; |
519 | } else { | |
cee63723 | 520 | err = -EINVAL; |
1da177e4 LT |
521 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) |
522 | goto err_out; | |
523 | } | |
524 | ||
525 | a_o = tc_lookup_action_n(act_name); | |
526 | if (a_o == NULL) { | |
95a5afca | 527 | #ifdef CONFIG_MODULES |
1da177e4 | 528 | rtnl_unlock(); |
4bba3925 | 529 | request_module("act_%s", act_name); |
1da177e4 LT |
530 | rtnl_lock(); |
531 | ||
532 | a_o = tc_lookup_action_n(act_name); | |
533 | ||
534 | /* We dropped the RTNL semaphore in order to | |
535 | * perform the module load. So, even if we | |
536 | * succeeded in loading the module we have to | |
537 | * tell the caller to replay the request. We | |
538 | * indicate this using -EAGAIN. | |
539 | */ | |
540 | if (a_o != NULL) { | |
ab27cfb8 | 541 | err = -EAGAIN; |
1da177e4 LT |
542 | goto err_mod; |
543 | } | |
544 | #endif | |
ab27cfb8 | 545 | err = -ENOENT; |
1da177e4 LT |
546 | goto err_out; |
547 | } | |
548 | ||
ab27cfb8 | 549 | err = -ENOMEM; |
0da974f4 | 550 | a = kzalloc(sizeof(*a), GFP_KERNEL); |
1da177e4 LT |
551 | if (a == NULL) |
552 | goto err_mod; | |
1da177e4 LT |
553 | |
554 | /* backward compatibility for policer */ | |
555 | if (name == NULL) | |
c1b52739 | 556 | err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, a, ovr, bind); |
1da177e4 | 557 | else |
c1b52739 | 558 | err = a_o->init(net, nla, est, a, ovr, bind); |
ab27cfb8 | 559 | if (err < 0) |
1da177e4 LT |
560 | goto err_free; |
561 | ||
562 | /* module count goes up only when brand new policy is created | |
cc7ec456 ED |
563 | * if it exists and is only bound to in a_o->init() then |
564 | * ACT_P_CREATED is not returned (a zero is). | |
565 | */ | |
ab27cfb8 | 566 | if (err != ACT_P_CREATED) |
1da177e4 LT |
567 | module_put(a_o->owner); |
568 | a->ops = a_o; | |
1da177e4 | 569 | |
1da177e4 LT |
570 | return a; |
571 | ||
572 | err_free: | |
573 | kfree(a); | |
574 | err_mod: | |
575 | module_put(a_o->owner); | |
576 | err_out: | |
ab27cfb8 | 577 | return ERR_PTR(err); |
1da177e4 LT |
578 | } |
579 | ||
c1b52739 BL |
580 | struct tc_action *tcf_action_init(struct net *net, struct nlattr *nla, |
581 | struct nlattr *est, char *name, int ovr, | |
582 | int bind) | |
1da177e4 | 583 | { |
cc7ec456 | 584 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
1da177e4 | 585 | struct tc_action *head = NULL, *act, *act_prev = NULL; |
cee63723 | 586 | int err; |
1da177e4 LT |
587 | int i; |
588 | ||
cee63723 PM |
589 | err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
590 | if (err < 0) | |
591 | return ERR_PTR(err); | |
1da177e4 | 592 | |
7ba699c6 | 593 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
c1b52739 | 594 | act = tcf_action_init_1(net, tb[i], est, name, ovr, bind); |
ab27cfb8 | 595 | if (IS_ERR(act)) |
1da177e4 | 596 | goto err; |
7ba699c6 | 597 | act->order = i; |
1da177e4 LT |
598 | |
599 | if (head == NULL) | |
600 | head = act; | |
601 | else | |
602 | act_prev->next = act; | |
603 | act_prev = act; | |
604 | } | |
605 | return head; | |
606 | ||
607 | err: | |
608 | if (head != NULL) | |
609 | tcf_action_destroy(head, bind); | |
ab27cfb8 | 610 | return act; |
1da177e4 LT |
611 | } |
612 | ||
613 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a, | |
614 | int compat_mode) | |
615 | { | |
616 | int err = 0; | |
617 | struct gnet_dump d; | |
618 | struct tcf_act_hdr *h = a->priv; | |
10297b99 | 619 | |
1da177e4 LT |
620 | if (h == NULL) |
621 | goto errout; | |
622 | ||
623 | /* compat_mode being true specifies a call that is supposed | |
06fe9fb4 | 624 | * to add additional backward compatibility statistic TLVs. |
1da177e4 LT |
625 | */ |
626 | if (compat_mode) { | |
627 | if (a->type == TCA_OLD_COMPAT) | |
628 | err = gnet_stats_start_copy_compat(skb, 0, | |
4bdf3991 | 629 | TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d); |
1da177e4 LT |
630 | else |
631 | return 0; | |
632 | } else | |
633 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
4bdf3991 | 634 | &h->tcf_lock, &d); |
1da177e4 LT |
635 | |
636 | if (err < 0) | |
637 | goto errout; | |
638 | ||
639 | if (a->ops != NULL && a->ops->get_stats != NULL) | |
640 | if (a->ops->get_stats(skb, a) < 0) | |
641 | goto errout; | |
642 | ||
e9ce1cd3 | 643 | if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 || |
d250a5f9 ED |
644 | gnet_stats_copy_rate_est(&d, &h->tcf_bstats, |
645 | &h->tcf_rate_est) < 0 || | |
e9ce1cd3 | 646 | gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0) |
1da177e4 LT |
647 | goto errout; |
648 | ||
649 | if (gnet_stats_finish_copy(&d) < 0) | |
650 | goto errout; | |
651 | ||
652 | return 0; | |
653 | ||
654 | errout: | |
655 | return -1; | |
656 | } | |
657 | ||
658 | static int | |
15e47304 | 659 | tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 portid, u32 seq, |
10297b99 | 660 | u16 flags, int event, int bind, int ref) |
1da177e4 LT |
661 | { |
662 | struct tcamsg *t; | |
663 | struct nlmsghdr *nlh; | |
27a884dc | 664 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 665 | struct nlattr *nest; |
1da177e4 | 666 | |
15e47304 | 667 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags); |
8b00a53c DM |
668 | if (!nlh) |
669 | goto out_nlmsg_trim; | |
670 | t = nlmsg_data(nlh); | |
1da177e4 | 671 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
672 | t->tca__pad1 = 0; |
673 | t->tca__pad2 = 0; | |
10297b99 | 674 | |
4b3550ef PM |
675 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
676 | if (nest == NULL) | |
8b00a53c | 677 | goto out_nlmsg_trim; |
1da177e4 LT |
678 | |
679 | if (tcf_action_dump(skb, a, bind, ref) < 0) | |
8b00a53c | 680 | goto out_nlmsg_trim; |
1da177e4 | 681 | |
4b3550ef | 682 | nla_nest_end(skb, nest); |
10297b99 | 683 | |
27a884dc | 684 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
685 | return skb->len; |
686 | ||
8b00a53c | 687 | out_nlmsg_trim: |
dc5fc579 | 688 | nlmsg_trim(skb, b); |
1da177e4 LT |
689 | return -1; |
690 | } | |
691 | ||
692 | static int | |
15e47304 | 693 | act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n, |
7316ae88 | 694 | struct tc_action *a, int event) |
1da177e4 LT |
695 | { |
696 | struct sk_buff *skb; | |
1da177e4 LT |
697 | |
698 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
699 | if (!skb) | |
700 | return -ENOBUFS; | |
15e47304 | 701 | if (tca_get_fill(skb, a, portid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { |
1da177e4 LT |
702 | kfree_skb(skb); |
703 | return -EINVAL; | |
704 | } | |
2942e900 | 705 | |
15e47304 | 706 | return rtnl_unicast(skb, net, portid); |
1da177e4 LT |
707 | } |
708 | ||
709 | static struct tc_action * | |
15e47304 | 710 | tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 portid) |
1da177e4 | 711 | { |
cc7ec456 | 712 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
1da177e4 LT |
713 | struct tc_action *a; |
714 | int index; | |
ab27cfb8 | 715 | int err; |
1da177e4 | 716 | |
cee63723 PM |
717 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
718 | if (err < 0) | |
ab27cfb8 | 719 | goto err_out; |
1da177e4 | 720 | |
cee63723 | 721 | err = -EINVAL; |
7ba699c6 PM |
722 | if (tb[TCA_ACT_INDEX] == NULL || |
723 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) | |
ab27cfb8 | 724 | goto err_out; |
1587bac4 | 725 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 726 | |
ab27cfb8 | 727 | err = -ENOMEM; |
0da974f4 | 728 | a = kzalloc(sizeof(struct tc_action), GFP_KERNEL); |
1da177e4 | 729 | if (a == NULL) |
ab27cfb8 | 730 | goto err_out; |
1da177e4 | 731 | |
ab27cfb8 | 732 | err = -EINVAL; |
7ba699c6 | 733 | a->ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
1da177e4 LT |
734 | if (a->ops == NULL) |
735 | goto err_free; | |
ab27cfb8 | 736 | err = -ENOENT; |
1da177e4 LT |
737 | if (a->ops->lookup(a, index) == 0) |
738 | goto err_mod; | |
739 | ||
740 | module_put(a->ops->owner); | |
1da177e4 | 741 | return a; |
ab27cfb8 | 742 | |
1da177e4 LT |
743 | err_mod: |
744 | module_put(a->ops->owner); | |
745 | err_free: | |
746 | kfree(a); | |
ab27cfb8 PM |
747 | err_out: |
748 | return ERR_PTR(err); | |
1da177e4 LT |
749 | } |
750 | ||
751 | static void cleanup_a(struct tc_action *act) | |
752 | { | |
753 | struct tc_action *a; | |
754 | ||
755 | for (a = act; a; a = act) { | |
756 | act = a->next; | |
757 | kfree(a); | |
758 | } | |
759 | } | |
760 | ||
761 | static struct tc_action *create_a(int i) | |
762 | { | |
763 | struct tc_action *act; | |
764 | ||
0da974f4 | 765 | act = kzalloc(sizeof(*act), GFP_KERNEL); |
1da177e4 | 766 | if (act == NULL) { |
6ff9c364 | 767 | pr_debug("create_a: failed to alloc!\n"); |
1da177e4 LT |
768 | return NULL; |
769 | } | |
1da177e4 LT |
770 | act->order = i; |
771 | return act; | |
772 | } | |
773 | ||
7316ae88 | 774 | static int tca_action_flush(struct net *net, struct nlattr *nla, |
15e47304 | 775 | struct nlmsghdr *n, u32 portid) |
1da177e4 LT |
776 | { |
777 | struct sk_buff *skb; | |
778 | unsigned char *b; | |
779 | struct nlmsghdr *nlh; | |
780 | struct tcamsg *t; | |
781 | struct netlink_callback dcb; | |
4b3550ef | 782 | struct nlattr *nest; |
cc7ec456 | 783 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 784 | struct nlattr *kind; |
1da177e4 | 785 | struct tc_action *a = create_a(0); |
36723873 | 786 | int err = -ENOMEM; |
1da177e4 LT |
787 | |
788 | if (a == NULL) { | |
6ff9c364 | 789 | pr_debug("tca_action_flush: couldnt create tc_action\n"); |
1da177e4 LT |
790 | return err; |
791 | } | |
792 | ||
793 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
794 | if (!skb) { | |
6ff9c364 | 795 | pr_debug("tca_action_flush: failed skb alloc\n"); |
1da177e4 | 796 | kfree(a); |
36723873 | 797 | return err; |
1da177e4 LT |
798 | } |
799 | ||
27a884dc | 800 | b = skb_tail_pointer(skb); |
1da177e4 | 801 | |
cee63723 PM |
802 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
803 | if (err < 0) | |
1da177e4 LT |
804 | goto err_out; |
805 | ||
cee63723 | 806 | err = -EINVAL; |
7ba699c6 | 807 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
808 | a->ops = tc_lookup_action(kind); |
809 | if (a->ops == NULL) | |
810 | goto err_out; | |
811 | ||
15e47304 | 812 | nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t), 0); |
8b00a53c DM |
813 | if (!nlh) |
814 | goto out_module_put; | |
815 | t = nlmsg_data(nlh); | |
1da177e4 | 816 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
817 | t->tca__pad1 = 0; |
818 | t->tca__pad2 = 0; | |
1da177e4 | 819 | |
4b3550ef PM |
820 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
821 | if (nest == NULL) | |
8b00a53c | 822 | goto out_module_put; |
1da177e4 LT |
823 | |
824 | err = a->ops->walk(skb, &dcb, RTM_DELACTION, a); | |
825 | if (err < 0) | |
8b00a53c | 826 | goto out_module_put; |
f97017cd JHS |
827 | if (err == 0) |
828 | goto noflush_out; | |
1da177e4 | 829 | |
4b3550ef | 830 | nla_nest_end(skb, nest); |
1da177e4 | 831 | |
27a884dc | 832 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
833 | nlh->nlmsg_flags |= NLM_F_ROOT; |
834 | module_put(a->ops->owner); | |
835 | kfree(a); | |
15e47304 | 836 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 837 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
838 | if (err > 0) |
839 | return 0; | |
840 | ||
841 | return err; | |
842 | ||
8b00a53c | 843 | out_module_put: |
ebbaeab1 | 844 | module_put(a->ops->owner); |
1da177e4 | 845 | err_out: |
f97017cd | 846 | noflush_out: |
1da177e4 LT |
847 | kfree_skb(skb); |
848 | kfree(a); | |
849 | return err; | |
850 | } | |
851 | ||
852 | static int | |
7316ae88 | 853 | tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
15e47304 | 854 | u32 portid, int event) |
1da177e4 | 855 | { |
cee63723 | 856 | int i, ret; |
cc7ec456 | 857 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
1da177e4 LT |
858 | struct tc_action *head = NULL, *act, *act_prev = NULL; |
859 | ||
cee63723 PM |
860 | ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
861 | if (ret < 0) | |
862 | return ret; | |
1da177e4 | 863 | |
cc7ec456 | 864 | if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) { |
f97017cd | 865 | if (tb[1] != NULL) |
15e47304 | 866 | return tca_action_flush(net, tb[1], n, portid); |
f97017cd JHS |
867 | else |
868 | return -EINVAL; | |
1da177e4 LT |
869 | } |
870 | ||
7ba699c6 | 871 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
15e47304 | 872 | act = tcf_action_get_1(tb[i], n, portid); |
ab27cfb8 PM |
873 | if (IS_ERR(act)) { |
874 | ret = PTR_ERR(act); | |
1da177e4 | 875 | goto err; |
ab27cfb8 | 876 | } |
7ba699c6 | 877 | act->order = i; |
1da177e4 LT |
878 | |
879 | if (head == NULL) | |
880 | head = act; | |
881 | else | |
882 | act_prev->next = act; | |
883 | act_prev = act; | |
884 | } | |
885 | ||
886 | if (event == RTM_GETACTION) | |
15e47304 | 887 | ret = act_get_notify(net, portid, n, head, event); |
1da177e4 LT |
888 | else { /* delete */ |
889 | struct sk_buff *skb; | |
890 | ||
891 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
892 | if (!skb) { | |
893 | ret = -ENOBUFS; | |
894 | goto err; | |
895 | } | |
896 | ||
15e47304 | 897 | if (tca_get_fill(skb, head, portid, n->nlmsg_seq, 0, event, |
10297b99 | 898 | 0, 1) <= 0) { |
1da177e4 LT |
899 | kfree_skb(skb); |
900 | ret = -EINVAL; | |
901 | goto err; | |
902 | } | |
903 | ||
904 | /* now do the delete */ | |
905 | tcf_action_destroy(head, 0); | |
15e47304 | 906 | ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 907 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
908 | if (ret > 0) |
909 | return 0; | |
910 | return ret; | |
911 | } | |
912 | err: | |
913 | cleanup_a(head); | |
914 | return ret; | |
915 | } | |
916 | ||
7316ae88 | 917 | static int tcf_add_notify(struct net *net, struct tc_action *a, |
15e47304 | 918 | u32 portid, u32 seq, int event, u16 flags) |
1da177e4 LT |
919 | { |
920 | struct tcamsg *t; | |
921 | struct nlmsghdr *nlh; | |
922 | struct sk_buff *skb; | |
4b3550ef | 923 | struct nlattr *nest; |
1da177e4 LT |
924 | unsigned char *b; |
925 | int err = 0; | |
926 | ||
927 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
928 | if (!skb) | |
929 | return -ENOBUFS; | |
930 | ||
27a884dc | 931 | b = skb_tail_pointer(skb); |
1da177e4 | 932 | |
15e47304 | 933 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags); |
8b00a53c DM |
934 | if (!nlh) |
935 | goto out_kfree_skb; | |
936 | t = nlmsg_data(nlh); | |
1da177e4 | 937 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
938 | t->tca__pad1 = 0; |
939 | t->tca__pad2 = 0; | |
940 | ||
4b3550ef PM |
941 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
942 | if (nest == NULL) | |
8b00a53c | 943 | goto out_kfree_skb; |
1da177e4 LT |
944 | |
945 | if (tcf_action_dump(skb, a, 0, 0) < 0) | |
8b00a53c | 946 | goto out_kfree_skb; |
1da177e4 | 947 | |
4b3550ef | 948 | nla_nest_end(skb, nest); |
10297b99 | 949 | |
27a884dc | 950 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
ac6d439d | 951 | NETLINK_CB(skb).dst_group = RTNLGRP_TC; |
10297b99 | 952 | |
15e47304 | 953 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO); |
1da177e4 LT |
954 | if (err > 0) |
955 | err = 0; | |
956 | return err; | |
957 | ||
8b00a53c | 958 | out_kfree_skb: |
f6e57464 | 959 | kfree_skb(skb); |
1da177e4 LT |
960 | return -1; |
961 | } | |
962 | ||
10297b99 | 963 | |
1da177e4 | 964 | static int |
7316ae88 | 965 | tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
15e47304 | 966 | u32 portid, int ovr) |
1da177e4 LT |
967 | { |
968 | int ret = 0; | |
969 | struct tc_action *act; | |
970 | struct tc_action *a; | |
971 | u32 seq = n->nlmsg_seq; | |
972 | ||
c1b52739 | 973 | act = tcf_action_init(net, nla, NULL, NULL, ovr, 0); |
1da177e4 LT |
974 | if (act == NULL) |
975 | goto done; | |
ab27cfb8 PM |
976 | if (IS_ERR(act)) { |
977 | ret = PTR_ERR(act); | |
978 | goto done; | |
979 | } | |
1da177e4 LT |
980 | |
981 | /* dump then free all the actions after update; inserted policy | |
982 | * stays intact | |
cc7ec456 | 983 | */ |
15e47304 | 984 | ret = tcf_add_notify(net, act, portid, seq, RTM_NEWACTION, n->nlmsg_flags); |
1da177e4 LT |
985 | for (a = act; a; a = act) { |
986 | act = a->next; | |
987 | kfree(a); | |
988 | } | |
989 | done: | |
990 | return ret; | |
991 | } | |
992 | ||
661d2967 | 993 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 994 | { |
3b1e0a65 | 995 | struct net *net = sock_net(skb->sk); |
7ba699c6 | 996 | struct nlattr *tca[TCA_ACT_MAX + 1]; |
15e47304 | 997 | u32 portid = skb ? NETLINK_CB(skb).portid : 0; |
1da177e4 LT |
998 | int ret = 0, ovr = 0; |
999 | ||
dfc47ef8 EB |
1000 | if ((n->nlmsg_type != RTM_GETACTION) && !capable(CAP_NET_ADMIN)) |
1001 | return -EPERM; | |
1002 | ||
7ba699c6 PM |
1003 | ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL); |
1004 | if (ret < 0) | |
1005 | return ret; | |
1006 | ||
1007 | if (tca[TCA_ACT_TAB] == NULL) { | |
6ff9c364 | 1008 | pr_notice("tc_ctl_action: received NO action attribs\n"); |
1da177e4 LT |
1009 | return -EINVAL; |
1010 | } | |
1011 | ||
cc7ec456 | 1012 | /* n->nlmsg_flags & NLM_F_CREATE */ |
1da177e4 LT |
1013 | switch (n->nlmsg_type) { |
1014 | case RTM_NEWACTION: | |
1015 | /* we are going to assume all other flags | |
25985edc | 1016 | * imply create only if it doesn't exist |
1da177e4 LT |
1017 | * Note that CREATE | EXCL implies that |
1018 | * but since we want avoid ambiguity (eg when flags | |
1019 | * is zero) then just set this | |
1020 | */ | |
cc7ec456 | 1021 | if (n->nlmsg_flags & NLM_F_REPLACE) |
1da177e4 LT |
1022 | ovr = 1; |
1023 | replay: | |
15e47304 | 1024 | ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr); |
1da177e4 LT |
1025 | if (ret == -EAGAIN) |
1026 | goto replay; | |
1027 | break; | |
1028 | case RTM_DELACTION: | |
7316ae88 | 1029 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
15e47304 | 1030 | portid, RTM_DELACTION); |
1da177e4 LT |
1031 | break; |
1032 | case RTM_GETACTION: | |
7316ae88 | 1033 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
15e47304 | 1034 | portid, RTM_GETACTION); |
1da177e4 LT |
1035 | break; |
1036 | default: | |
1037 | BUG(); | |
1038 | } | |
1039 | ||
1040 | return ret; | |
1041 | } | |
1042 | ||
7ba699c6 | 1043 | static struct nlattr * |
3a6c2b41 | 1044 | find_dump_kind(const struct nlmsghdr *n) |
1da177e4 | 1045 | { |
cc7ec456 | 1046 | struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1]; |
7ba699c6 PM |
1047 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
1048 | struct nlattr *nla[TCAA_MAX + 1]; | |
1049 | struct nlattr *kind; | |
1da177e4 | 1050 | |
c96c9471 | 1051 | if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0) |
1da177e4 | 1052 | return NULL; |
7ba699c6 | 1053 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
1054 | if (tb1 == NULL) |
1055 | return NULL; | |
1056 | ||
7ba699c6 PM |
1057 | if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), |
1058 | NLMSG_ALIGN(nla_len(tb1)), NULL) < 0) | |
1da177e4 | 1059 | return NULL; |
1da177e4 | 1060 | |
6d834e04 PM |
1061 | if (tb[1] == NULL) |
1062 | return NULL; | |
1063 | if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]), | |
1064 | nla_len(tb[1]), NULL) < 0) | |
1da177e4 | 1065 | return NULL; |
7ba699c6 | 1066 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 1067 | |
26dab893 | 1068 | return kind; |
1da177e4 LT |
1069 | } |
1070 | ||
1071 | static int | |
1072 | tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) | |
1073 | { | |
1074 | struct nlmsghdr *nlh; | |
27a884dc | 1075 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1076 | struct nlattr *nest; |
1da177e4 LT |
1077 | struct tc_action_ops *a_o; |
1078 | struct tc_action a; | |
1079 | int ret = 0; | |
8b00a53c | 1080 | struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh); |
7ba699c6 | 1081 | struct nlattr *kind = find_dump_kind(cb->nlh); |
1da177e4 LT |
1082 | |
1083 | if (kind == NULL) { | |
6ff9c364 | 1084 | pr_info("tc_dump_action: action bad kind\n"); |
1da177e4 LT |
1085 | return 0; |
1086 | } | |
1087 | ||
26dab893 | 1088 | a_o = tc_lookup_action(kind); |
cc7ec456 | 1089 | if (a_o == NULL) |
1da177e4 | 1090 | return 0; |
1da177e4 LT |
1091 | |
1092 | memset(&a, 0, sizeof(struct tc_action)); | |
1093 | a.ops = a_o; | |
1094 | ||
15e47304 | 1095 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
8b00a53c DM |
1096 | cb->nlh->nlmsg_type, sizeof(*t), 0); |
1097 | if (!nlh) | |
1098 | goto out_module_put; | |
1099 | t = nlmsg_data(nlh); | |
1da177e4 | 1100 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1101 | t->tca__pad1 = 0; |
1102 | t->tca__pad2 = 0; | |
1da177e4 | 1103 | |
4b3550ef PM |
1104 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
1105 | if (nest == NULL) | |
8b00a53c | 1106 | goto out_module_put; |
1da177e4 LT |
1107 | |
1108 | ret = a_o->walk(skb, cb, RTM_GETACTION, &a); | |
1109 | if (ret < 0) | |
8b00a53c | 1110 | goto out_module_put; |
1da177e4 LT |
1111 | |
1112 | if (ret > 0) { | |
4b3550ef | 1113 | nla_nest_end(skb, nest); |
1da177e4 LT |
1114 | ret = skb->len; |
1115 | } else | |
4b3550ef | 1116 | nla_nest_cancel(skb, nest); |
1da177e4 | 1117 | |
27a884dc | 1118 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
15e47304 | 1119 | if (NETLINK_CB(cb->skb).portid && ret) |
1da177e4 LT |
1120 | nlh->nlmsg_flags |= NLM_F_MULTI; |
1121 | module_put(a_o->owner); | |
1122 | return skb->len; | |
1123 | ||
8b00a53c | 1124 | out_module_put: |
1da177e4 | 1125 | module_put(a_o->owner); |
dc5fc579 | 1126 | nlmsg_trim(skb, b); |
1da177e4 LT |
1127 | return skb->len; |
1128 | } | |
1129 | ||
1130 | static int __init tc_action_init(void) | |
1131 | { | |
c7ac8679 GR |
1132 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL); |
1133 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL); | |
1134 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, | |
1135 | NULL); | |
1da177e4 | 1136 | |
1da177e4 LT |
1137 | return 0; |
1138 | } | |
1139 | ||
1140 | subsys_initcall(tc_action_init); |