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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * net/sched/act_api.c Packet action API. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Author: Jamal Hadi Salim | |
10 | * | |
11 | * | |
12 | */ | |
13 | ||
1da177e4 LT |
14 | #include <linux/types.h> |
15 | #include <linux/kernel.h> | |
1da177e4 | 16 | #include <linux/string.h> |
1da177e4 | 17 | #include <linux/errno.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
1da177e4 | 19 | #include <linux/skbuff.h> |
1da177e4 LT |
20 | #include <linux/init.h> |
21 | #include <linux/kmod.h> | |
ab27cfb8 | 22 | #include <linux/err.h> |
b854272b DL |
23 | #include <net/net_namespace.h> |
24 | #include <net/sock.h> | |
1da177e4 LT |
25 | #include <net/sch_generic.h> |
26 | #include <net/act_api.h> | |
dc5fc579 | 27 | #include <net/netlink.h> |
1da177e4 | 28 | |
c7de2cf0 ED |
29 | static void tcf_common_free_rcu(struct rcu_head *head) |
30 | { | |
31 | kfree(container_of(head, struct tcf_common, tcfc_rcu)); | |
32 | } | |
33 | ||
e9ce1cd3 DM |
34 | void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo) |
35 | { | |
36 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); | |
37 | struct tcf_common **p1p; | |
38 | ||
39 | for (p1p = &hinfo->htab[h]; *p1p; p1p = &(*p1p)->tcfc_next) { | |
40 | if (*p1p == p) { | |
41 | write_lock_bh(hinfo->lock); | |
42 | *p1p = p->tcfc_next; | |
43 | write_unlock_bh(hinfo->lock); | |
e9ce1cd3 DM |
44 | gen_kill_estimator(&p->tcfc_bstats, |
45 | &p->tcfc_rate_est); | |
c7de2cf0 ED |
46 | /* |
47 | * gen_estimator est_timer() might access p->tcfc_lock | |
48 | * or bstats, wait a RCU grace period before freeing p | |
49 | */ | |
50 | call_rcu(&p->tcfc_rcu, tcf_common_free_rcu); | |
e9ce1cd3 DM |
51 | return; |
52 | } | |
53 | } | |
547b792c | 54 | WARN_ON(1); |
e9ce1cd3 DM |
55 | } |
56 | EXPORT_SYMBOL(tcf_hash_destroy); | |
57 | ||
58 | int tcf_hash_release(struct tcf_common *p, int bind, | |
59 | struct tcf_hashinfo *hinfo) | |
60 | { | |
61 | int ret = 0; | |
62 | ||
63 | if (p) { | |
64 | if (bind) | |
65 | p->tcfc_bindcnt--; | |
66 | ||
67 | p->tcfc_refcnt--; | |
10297b99 | 68 | if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) { |
e9ce1cd3 DM |
69 | tcf_hash_destroy(p, hinfo); |
70 | ret = 1; | |
71 | } | |
72 | } | |
73 | return ret; | |
74 | } | |
75 | EXPORT_SYMBOL(tcf_hash_release); | |
76 | ||
77 | static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
78 | struct tc_action *a, struct tcf_hashinfo *hinfo) | |
79 | { | |
80 | struct tcf_common *p; | |
cc7ec456 | 81 | int err = 0, index = -1, i = 0, s_i = 0, n_i = 0; |
4b3550ef | 82 | struct nlattr *nest; |
e9ce1cd3 | 83 | |
e1e992e5 | 84 | read_lock_bh(hinfo->lock); |
e9ce1cd3 DM |
85 | |
86 | s_i = cb->args[0]; | |
87 | ||
88 | for (i = 0; i < (hinfo->hmask + 1); i++) { | |
89 | p = hinfo->htab[tcf_hash(i, hinfo->hmask)]; | |
90 | ||
91 | for (; p; p = p->tcfc_next) { | |
92 | index++; | |
93 | if (index < s_i) | |
94 | continue; | |
95 | a->priv = p; | |
96 | a->order = n_i; | |
4b3550ef PM |
97 | |
98 | nest = nla_nest_start(skb, a->order); | |
99 | if (nest == NULL) | |
100 | goto nla_put_failure; | |
e9ce1cd3 DM |
101 | err = tcf_action_dump_1(skb, a, 0, 0); |
102 | if (err < 0) { | |
103 | index--; | |
4b3550ef | 104 | nlmsg_trim(skb, nest); |
e9ce1cd3 DM |
105 | goto done; |
106 | } | |
4b3550ef | 107 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
108 | n_i++; |
109 | if (n_i >= TCA_ACT_MAX_PRIO) | |
110 | goto done; | |
111 | } | |
112 | } | |
113 | done: | |
e1e992e5 | 114 | read_unlock_bh(hinfo->lock); |
e9ce1cd3 DM |
115 | if (n_i) |
116 | cb->args[0] += n_i; | |
117 | return n_i; | |
118 | ||
7ba699c6 | 119 | nla_put_failure: |
4b3550ef | 120 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
121 | goto done; |
122 | } | |
123 | ||
124 | static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a, | |
125 | struct tcf_hashinfo *hinfo) | |
126 | { | |
127 | struct tcf_common *p, *s_p; | |
4b3550ef | 128 | struct nlattr *nest; |
cc7ec456 | 129 | int i = 0, n_i = 0; |
e9ce1cd3 | 130 | |
4b3550ef PM |
131 | nest = nla_nest_start(skb, a->order); |
132 | if (nest == NULL) | |
133 | goto nla_put_failure; | |
57e1c487 | 134 | NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind); |
e9ce1cd3 DM |
135 | for (i = 0; i < (hinfo->hmask + 1); i++) { |
136 | p = hinfo->htab[tcf_hash(i, hinfo->hmask)]; | |
137 | ||
138 | while (p != NULL) { | |
139 | s_p = p->tcfc_next; | |
140 | if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo)) | |
cc7ec456 | 141 | module_put(a->ops->owner); |
e9ce1cd3 DM |
142 | n_i++; |
143 | p = s_p; | |
144 | } | |
145 | } | |
24beeab5 | 146 | NLA_PUT_U32(skb, TCA_FCNT, n_i); |
4b3550ef | 147 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
148 | |
149 | return n_i; | |
7ba699c6 | 150 | nla_put_failure: |
4b3550ef | 151 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
152 | return -EINVAL; |
153 | } | |
154 | ||
155 | int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
156 | int type, struct tc_action *a) | |
157 | { | |
158 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
159 | ||
160 | if (type == RTM_DELACTION) { | |
161 | return tcf_del_walker(skb, a, hinfo); | |
162 | } else if (type == RTM_GETACTION) { | |
163 | return tcf_dump_walker(skb, cb, a, hinfo); | |
164 | } else { | |
6ff9c364 | 165 | WARN(1, "tcf_generic_walker: unknown action %d\n", type); |
e9ce1cd3 DM |
166 | return -EINVAL; |
167 | } | |
168 | } | |
169 | EXPORT_SYMBOL(tcf_generic_walker); | |
170 | ||
171 | struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo) | |
172 | { | |
173 | struct tcf_common *p; | |
174 | ||
e1e992e5 | 175 | read_lock_bh(hinfo->lock); |
e9ce1cd3 DM |
176 | for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p; |
177 | p = p->tcfc_next) { | |
178 | if (p->tcfc_index == index) | |
179 | break; | |
180 | } | |
e1e992e5 | 181 | read_unlock_bh(hinfo->lock); |
e9ce1cd3 DM |
182 | |
183 | return p; | |
184 | } | |
185 | EXPORT_SYMBOL(tcf_hash_lookup); | |
186 | ||
187 | u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo) | |
188 | { | |
189 | u32 val = *idx_gen; | |
190 | ||
191 | do { | |
192 | if (++val == 0) | |
193 | val = 1; | |
194 | } while (tcf_hash_lookup(val, hinfo)); | |
195 | ||
196 | return (*idx_gen = val); | |
197 | } | |
198 | EXPORT_SYMBOL(tcf_hash_new_index); | |
199 | ||
200 | int tcf_hash_search(struct tc_action *a, u32 index) | |
201 | { | |
202 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
203 | struct tcf_common *p = tcf_hash_lookup(index, hinfo); | |
204 | ||
205 | if (p) { | |
206 | a->priv = p; | |
207 | return 1; | |
208 | } | |
209 | return 0; | |
210 | } | |
211 | EXPORT_SYMBOL(tcf_hash_search); | |
212 | ||
213 | struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind, | |
214 | struct tcf_hashinfo *hinfo) | |
215 | { | |
216 | struct tcf_common *p = NULL; | |
217 | if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) { | |
76aab2c1 | 218 | if (bind) |
e9ce1cd3 | 219 | p->tcfc_bindcnt++; |
76aab2c1 | 220 | p->tcfc_refcnt++; |
e9ce1cd3 DM |
221 | a->priv = p; |
222 | } | |
223 | return p; | |
224 | } | |
225 | EXPORT_SYMBOL(tcf_hash_check); | |
226 | ||
0e991ec6 SH |
227 | struct tcf_common *tcf_hash_create(u32 index, struct nlattr *est, |
228 | struct tc_action *a, int size, int bind, | |
229 | u32 *idx_gen, struct tcf_hashinfo *hinfo) | |
e9ce1cd3 DM |
230 | { |
231 | struct tcf_common *p = kzalloc(size, GFP_KERNEL); | |
232 | ||
233 | if (unlikely(!p)) | |
0e991ec6 | 234 | return ERR_PTR(-ENOMEM); |
e9ce1cd3 DM |
235 | p->tcfc_refcnt = 1; |
236 | if (bind) | |
237 | p->tcfc_bindcnt = 1; | |
238 | ||
239 | spin_lock_init(&p->tcfc_lock); | |
e9ce1cd3 DM |
240 | p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo); |
241 | p->tcfc_tm.install = jiffies; | |
242 | p->tcfc_tm.lastuse = jiffies; | |
0e991ec6 SH |
243 | if (est) { |
244 | int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est, | |
245 | &p->tcfc_lock, est); | |
246 | if (err) { | |
247 | kfree(p); | |
248 | return ERR_PTR(err); | |
249 | } | |
250 | } | |
251 | ||
e9ce1cd3 DM |
252 | a->priv = (void *) p; |
253 | return p; | |
254 | } | |
255 | EXPORT_SYMBOL(tcf_hash_create); | |
256 | ||
257 | void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo) | |
258 | { | |
259 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); | |
260 | ||
261 | write_lock_bh(hinfo->lock); | |
262 | p->tcfc_next = hinfo->htab[h]; | |
263 | hinfo->htab[h] = p; | |
264 | write_unlock_bh(hinfo->lock); | |
265 | } | |
266 | EXPORT_SYMBOL(tcf_hash_insert); | |
1da177e4 LT |
267 | |
268 | static struct tc_action_ops *act_base = NULL; | |
269 | static DEFINE_RWLOCK(act_mod_lock); | |
270 | ||
271 | int tcf_register_action(struct tc_action_ops *act) | |
272 | { | |
273 | struct tc_action_ops *a, **ap; | |
274 | ||
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 | ||
373 | int tcf_action_exec(struct sk_buff *skb, struct tc_action *act, | |
10297b99 | 374 | struct tcf_result *res) |
1da177e4 LT |
375 | { |
376 | struct tc_action *a; | |
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 | } | |
384 | while ((a = act) != NULL) { | |
385 | repeat: | |
386 | if (a->ops && a->ops->act) { | |
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 LT |
397 | } |
398 | act = a->next; | |
399 | } | |
400 | exec_done: | |
1da177e4 LT |
401 | return ret; |
402 | } | |
62e3ba1b | 403 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 LT |
404 | |
405 | void tcf_action_destroy(struct tc_action *act, int bind) | |
406 | { | |
407 | struct tc_action *a; | |
408 | ||
409 | for (a = act; a; a = act) { | |
410 | if (a->ops && a->ops->cleanup) { | |
1da177e4 LT |
411 | if (a->ops->cleanup(a, bind) == ACT_P_DELETED) |
412 | module_put(a->ops->owner); | |
413 | act = act->next; | |
414 | kfree(a); | |
6ff9c364 | 415 | } else { |
416 | /*FIXME: Remove later - catch insertion bugs*/ | |
417 | WARN(1, "tcf_action_destroy: BUG? destroying NULL ops\n"); | |
1da177e4 LT |
418 | act = act->next; |
419 | kfree(a); | |
420 | } | |
421 | } | |
422 | } | |
423 | ||
424 | int | |
425 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
426 | { | |
427 | int err = -EINVAL; | |
428 | ||
429 | if (a->ops == NULL || a->ops->dump == NULL) | |
430 | return err; | |
431 | return a->ops->dump(skb, a, bind, ref); | |
432 | } | |
433 | ||
434 | int | |
435 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
436 | { | |
437 | int err = -EINVAL; | |
27a884dc | 438 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 439 | struct nlattr *nest; |
1da177e4 LT |
440 | |
441 | if (a->ops == NULL || a->ops->dump == NULL) | |
442 | return err; | |
443 | ||
57e1c487 | 444 | NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind); |
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 | |
463 | tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref) | |
464 | { | |
465 | struct tc_action *a; | |
466 | int err = -EINVAL; | |
4b3550ef | 467 | struct nlattr *nest; |
1da177e4 LT |
468 | |
469 | while ((a = act) != NULL) { | |
1da177e4 | 470 | act = a->next; |
4b3550ef PM |
471 | nest = nla_nest_start(skb, a->order); |
472 | if (nest == NULL) | |
473 | goto nla_put_failure; | |
1da177e4 LT |
474 | err = tcf_action_dump_1(skb, a, bind, ref); |
475 | if (err < 0) | |
4fe683f5 | 476 | goto errout; |
4b3550ef | 477 | nla_nest_end(skb, nest); |
1da177e4 LT |
478 | } |
479 | ||
480 | return 0; | |
481 | ||
7ba699c6 | 482 | nla_put_failure: |
4fe683f5 TG |
483 | err = -EINVAL; |
484 | errout: | |
4b3550ef | 485 | nla_nest_cancel(skb, nest); |
4fe683f5 | 486 | return err; |
1da177e4 LT |
487 | } |
488 | ||
7ba699c6 | 489 | struct tc_action *tcf_action_init_1(struct nlattr *nla, struct nlattr *est, |
ab27cfb8 | 490 | char *name, int ovr, 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 LT |
543 | |
544 | /* backward compatibility for policer */ | |
545 | if (name == NULL) | |
ab27cfb8 | 546 | err = a_o->init(tb[TCA_ACT_OPTIONS], est, a, ovr, bind); |
1da177e4 | 547 | else |
ab27cfb8 PM |
548 | err = a_o->init(nla, est, a, ovr, bind); |
549 | if (err < 0) | |
1da177e4 LT |
550 | goto err_free; |
551 | ||
552 | /* module count goes up only when brand new policy is created | |
cc7ec456 ED |
553 | * if it exists and is only bound to in a_o->init() then |
554 | * ACT_P_CREATED is not returned (a zero is). | |
555 | */ | |
ab27cfb8 | 556 | if (err != ACT_P_CREATED) |
1da177e4 LT |
557 | module_put(a_o->owner); |
558 | a->ops = a_o; | |
1da177e4 | 559 | |
1da177e4 LT |
560 | return a; |
561 | ||
562 | err_free: | |
563 | kfree(a); | |
564 | err_mod: | |
565 | module_put(a_o->owner); | |
566 | err_out: | |
ab27cfb8 | 567 | return ERR_PTR(err); |
1da177e4 LT |
568 | } |
569 | ||
7ba699c6 | 570 | struct tc_action *tcf_action_init(struct nlattr *nla, struct nlattr *est, |
ab27cfb8 | 571 | char *name, int ovr, int bind) |
1da177e4 | 572 | { |
cc7ec456 | 573 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
1da177e4 | 574 | struct tc_action *head = NULL, *act, *act_prev = NULL; |
cee63723 | 575 | int err; |
1da177e4 LT |
576 | int i; |
577 | ||
cee63723 PM |
578 | err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
579 | if (err < 0) | |
580 | return ERR_PTR(err); | |
1da177e4 | 581 | |
7ba699c6 | 582 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
ab27cfb8 PM |
583 | act = tcf_action_init_1(tb[i], est, name, ovr, bind); |
584 | if (IS_ERR(act)) | |
1da177e4 | 585 | goto err; |
7ba699c6 | 586 | act->order = i; |
1da177e4 LT |
587 | |
588 | if (head == NULL) | |
589 | head = act; | |
590 | else | |
591 | act_prev->next = act; | |
592 | act_prev = act; | |
593 | } | |
594 | return head; | |
595 | ||
596 | err: | |
597 | if (head != NULL) | |
598 | tcf_action_destroy(head, bind); | |
ab27cfb8 | 599 | return act; |
1da177e4 LT |
600 | } |
601 | ||
602 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a, | |
603 | int compat_mode) | |
604 | { | |
605 | int err = 0; | |
606 | struct gnet_dump d; | |
607 | struct tcf_act_hdr *h = a->priv; | |
10297b99 | 608 | |
1da177e4 LT |
609 | if (h == NULL) |
610 | goto errout; | |
611 | ||
612 | /* compat_mode being true specifies a call that is supposed | |
06fe9fb4 | 613 | * to add additional backward compatibility statistic TLVs. |
1da177e4 LT |
614 | */ |
615 | if (compat_mode) { | |
616 | if (a->type == TCA_OLD_COMPAT) | |
617 | err = gnet_stats_start_copy_compat(skb, 0, | |
4bdf3991 | 618 | TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d); |
1da177e4 LT |
619 | else |
620 | return 0; | |
621 | } else | |
622 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
4bdf3991 | 623 | &h->tcf_lock, &d); |
1da177e4 LT |
624 | |
625 | if (err < 0) | |
626 | goto errout; | |
627 | ||
628 | if (a->ops != NULL && a->ops->get_stats != NULL) | |
629 | if (a->ops->get_stats(skb, a) < 0) | |
630 | goto errout; | |
631 | ||
e9ce1cd3 | 632 | if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 || |
d250a5f9 ED |
633 | gnet_stats_copy_rate_est(&d, &h->tcf_bstats, |
634 | &h->tcf_rate_est) < 0 || | |
e9ce1cd3 | 635 | gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0) |
1da177e4 LT |
636 | goto errout; |
637 | ||
638 | if (gnet_stats_finish_copy(&d) < 0) | |
639 | goto errout; | |
640 | ||
641 | return 0; | |
642 | ||
643 | errout: | |
644 | return -1; | |
645 | } | |
646 | ||
647 | static int | |
648 | tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq, | |
10297b99 | 649 | u16 flags, int event, int bind, int ref) |
1da177e4 LT |
650 | { |
651 | struct tcamsg *t; | |
652 | struct nlmsghdr *nlh; | |
27a884dc | 653 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 654 | struct nlattr *nest; |
1da177e4 | 655 | |
e431b8c0 JHS |
656 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
657 | ||
1da177e4 LT |
658 | t = NLMSG_DATA(nlh); |
659 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
660 | t->tca__pad1 = 0; |
661 | t->tca__pad2 = 0; | |
10297b99 | 662 | |
4b3550ef PM |
663 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
664 | if (nest == NULL) | |
665 | goto nla_put_failure; | |
1da177e4 LT |
666 | |
667 | if (tcf_action_dump(skb, a, bind, ref) < 0) | |
7ba699c6 | 668 | goto nla_put_failure; |
1da177e4 | 669 | |
4b3550ef | 670 | nla_nest_end(skb, nest); |
10297b99 | 671 | |
27a884dc | 672 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
673 | return skb->len; |
674 | ||
7ba699c6 | 675 | nla_put_failure: |
1da177e4 | 676 | nlmsg_failure: |
dc5fc579 | 677 | nlmsg_trim(skb, b); |
1da177e4 LT |
678 | return -1; |
679 | } | |
680 | ||
681 | static int | |
7316ae88 TG |
682 | act_get_notify(struct net *net, u32 pid, struct nlmsghdr *n, |
683 | struct tc_action *a, int event) | |
1da177e4 LT |
684 | { |
685 | struct sk_buff *skb; | |
1da177e4 LT |
686 | |
687 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
688 | if (!skb) | |
689 | return -ENOBUFS; | |
690 | if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { | |
691 | kfree_skb(skb); | |
692 | return -EINVAL; | |
693 | } | |
2942e900 | 694 | |
7316ae88 | 695 | return rtnl_unicast(skb, net, pid); |
1da177e4 LT |
696 | } |
697 | ||
698 | static struct tc_action * | |
ab27cfb8 | 699 | tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid) |
1da177e4 | 700 | { |
cc7ec456 | 701 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
1da177e4 LT |
702 | struct tc_action *a; |
703 | int index; | |
ab27cfb8 | 704 | int err; |
1da177e4 | 705 | |
cee63723 PM |
706 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
707 | if (err < 0) | |
ab27cfb8 | 708 | goto err_out; |
1da177e4 | 709 | |
cee63723 | 710 | err = -EINVAL; |
7ba699c6 PM |
711 | if (tb[TCA_ACT_INDEX] == NULL || |
712 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) | |
ab27cfb8 | 713 | goto err_out; |
1587bac4 | 714 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 715 | |
ab27cfb8 | 716 | err = -ENOMEM; |
0da974f4 | 717 | a = kzalloc(sizeof(struct tc_action), GFP_KERNEL); |
1da177e4 | 718 | if (a == NULL) |
ab27cfb8 | 719 | goto err_out; |
1da177e4 | 720 | |
ab27cfb8 | 721 | err = -EINVAL; |
7ba699c6 | 722 | a->ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
1da177e4 LT |
723 | if (a->ops == NULL) |
724 | goto err_free; | |
725 | if (a->ops->lookup == NULL) | |
726 | goto err_mod; | |
ab27cfb8 | 727 | err = -ENOENT; |
1da177e4 LT |
728 | if (a->ops->lookup(a, index) == 0) |
729 | goto err_mod; | |
730 | ||
731 | module_put(a->ops->owner); | |
1da177e4 | 732 | return a; |
ab27cfb8 | 733 | |
1da177e4 LT |
734 | err_mod: |
735 | module_put(a->ops->owner); | |
736 | err_free: | |
737 | kfree(a); | |
ab27cfb8 PM |
738 | err_out: |
739 | return ERR_PTR(err); | |
1da177e4 LT |
740 | } |
741 | ||
742 | static void cleanup_a(struct tc_action *act) | |
743 | { | |
744 | struct tc_action *a; | |
745 | ||
746 | for (a = act; a; a = act) { | |
747 | act = a->next; | |
748 | kfree(a); | |
749 | } | |
750 | } | |
751 | ||
752 | static struct tc_action *create_a(int i) | |
753 | { | |
754 | struct tc_action *act; | |
755 | ||
0da974f4 | 756 | act = kzalloc(sizeof(*act), GFP_KERNEL); |
1da177e4 | 757 | if (act == NULL) { |
6ff9c364 | 758 | pr_debug("create_a: failed to alloc!\n"); |
1da177e4 LT |
759 | return NULL; |
760 | } | |
1da177e4 LT |
761 | act->order = i; |
762 | return act; | |
763 | } | |
764 | ||
7316ae88 TG |
765 | static int tca_action_flush(struct net *net, struct nlattr *nla, |
766 | struct nlmsghdr *n, u32 pid) | |
1da177e4 LT |
767 | { |
768 | struct sk_buff *skb; | |
769 | unsigned char *b; | |
770 | struct nlmsghdr *nlh; | |
771 | struct tcamsg *t; | |
772 | struct netlink_callback dcb; | |
4b3550ef | 773 | struct nlattr *nest; |
cc7ec456 | 774 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 775 | struct nlattr *kind; |
1da177e4 | 776 | struct tc_action *a = create_a(0); |
36723873 | 777 | int err = -ENOMEM; |
1da177e4 LT |
778 | |
779 | if (a == NULL) { | |
6ff9c364 | 780 | pr_debug("tca_action_flush: couldnt create tc_action\n"); |
1da177e4 LT |
781 | return err; |
782 | } | |
783 | ||
784 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
785 | if (!skb) { | |
6ff9c364 | 786 | pr_debug("tca_action_flush: failed skb alloc\n"); |
1da177e4 | 787 | kfree(a); |
36723873 | 788 | return err; |
1da177e4 LT |
789 | } |
790 | ||
27a884dc | 791 | b = skb_tail_pointer(skb); |
1da177e4 | 792 | |
cee63723 PM |
793 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
794 | if (err < 0) | |
1da177e4 LT |
795 | goto err_out; |
796 | ||
cee63723 | 797 | err = -EINVAL; |
7ba699c6 | 798 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
799 | a->ops = tc_lookup_action(kind); |
800 | if (a->ops == NULL) | |
801 | goto err_out; | |
802 | ||
803 | nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t)); | |
804 | t = NLMSG_DATA(nlh); | |
805 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
806 | t->tca__pad1 = 0; |
807 | t->tca__pad2 = 0; | |
1da177e4 | 808 | |
4b3550ef PM |
809 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
810 | if (nest == NULL) | |
811 | goto nla_put_failure; | |
1da177e4 LT |
812 | |
813 | err = a->ops->walk(skb, &dcb, RTM_DELACTION, a); | |
814 | if (err < 0) | |
7ba699c6 | 815 | goto nla_put_failure; |
f97017cd JHS |
816 | if (err == 0) |
817 | goto noflush_out; | |
1da177e4 | 818 | |
4b3550ef | 819 | nla_nest_end(skb, nest); |
1da177e4 | 820 | |
27a884dc | 821 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
822 | nlh->nlmsg_flags |= NLM_F_ROOT; |
823 | module_put(a->ops->owner); | |
824 | kfree(a); | |
cc7ec456 ED |
825 | err = rtnetlink_send(skb, net, pid, RTNLGRP_TC, |
826 | n->nlmsg_flags & NLM_F_ECHO); | |
1da177e4 LT |
827 | if (err > 0) |
828 | return 0; | |
829 | ||
830 | return err; | |
831 | ||
7ba699c6 | 832 | nla_put_failure: |
1da177e4 | 833 | nlmsg_failure: |
ebbaeab1 | 834 | module_put(a->ops->owner); |
1da177e4 | 835 | err_out: |
f97017cd | 836 | noflush_out: |
1da177e4 LT |
837 | kfree_skb(skb); |
838 | kfree(a); | |
839 | return err; | |
840 | } | |
841 | ||
842 | static int | |
7316ae88 TG |
843 | tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
844 | u32 pid, int event) | |
1da177e4 | 845 | { |
cee63723 | 846 | int i, ret; |
cc7ec456 | 847 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
1da177e4 LT |
848 | struct tc_action *head = NULL, *act, *act_prev = NULL; |
849 | ||
cee63723 PM |
850 | ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
851 | if (ret < 0) | |
852 | return ret; | |
1da177e4 | 853 | |
cc7ec456 | 854 | if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) { |
f97017cd | 855 | if (tb[1] != NULL) |
7316ae88 | 856 | return tca_action_flush(net, tb[1], n, pid); |
f97017cd JHS |
857 | else |
858 | return -EINVAL; | |
1da177e4 LT |
859 | } |
860 | ||
7ba699c6 | 861 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
ab27cfb8 PM |
862 | act = tcf_action_get_1(tb[i], n, pid); |
863 | if (IS_ERR(act)) { | |
864 | ret = PTR_ERR(act); | |
1da177e4 | 865 | goto err; |
ab27cfb8 | 866 | } |
7ba699c6 | 867 | act->order = i; |
1da177e4 LT |
868 | |
869 | if (head == NULL) | |
870 | head = act; | |
871 | else | |
872 | act_prev->next = act; | |
873 | act_prev = act; | |
874 | } | |
875 | ||
876 | if (event == RTM_GETACTION) | |
7316ae88 | 877 | ret = act_get_notify(net, pid, n, head, event); |
1da177e4 LT |
878 | else { /* delete */ |
879 | struct sk_buff *skb; | |
880 | ||
881 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
882 | if (!skb) { | |
883 | ret = -ENOBUFS; | |
884 | goto err; | |
885 | } | |
886 | ||
887 | if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event, | |
10297b99 | 888 | 0, 1) <= 0) { |
1da177e4 LT |
889 | kfree_skb(skb); |
890 | ret = -EINVAL; | |
891 | goto err; | |
892 | } | |
893 | ||
894 | /* now do the delete */ | |
895 | tcf_action_destroy(head, 0); | |
7316ae88 | 896 | ret = rtnetlink_send(skb, net, pid, RTNLGRP_TC, |
cc7ec456 | 897 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
898 | if (ret > 0) |
899 | return 0; | |
900 | return ret; | |
901 | } | |
902 | err: | |
903 | cleanup_a(head); | |
904 | return ret; | |
905 | } | |
906 | ||
7316ae88 TG |
907 | static int tcf_add_notify(struct net *net, struct tc_action *a, |
908 | u32 pid, u32 seq, int event, u16 flags) | |
1da177e4 LT |
909 | { |
910 | struct tcamsg *t; | |
911 | struct nlmsghdr *nlh; | |
912 | struct sk_buff *skb; | |
4b3550ef | 913 | struct nlattr *nest; |
1da177e4 LT |
914 | unsigned char *b; |
915 | int err = 0; | |
916 | ||
917 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
918 | if (!skb) | |
919 | return -ENOBUFS; | |
920 | ||
27a884dc | 921 | b = skb_tail_pointer(skb); |
1da177e4 | 922 | |
e431b8c0 | 923 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
1da177e4 LT |
924 | t = NLMSG_DATA(nlh); |
925 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
926 | t->tca__pad1 = 0; |
927 | t->tca__pad2 = 0; | |
928 | ||
4b3550ef PM |
929 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
930 | if (nest == NULL) | |
931 | goto nla_put_failure; | |
1da177e4 LT |
932 | |
933 | if (tcf_action_dump(skb, a, 0, 0) < 0) | |
7ba699c6 | 934 | goto nla_put_failure; |
1da177e4 | 935 | |
4b3550ef | 936 | nla_nest_end(skb, nest); |
10297b99 | 937 | |
27a884dc | 938 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
ac6d439d | 939 | NETLINK_CB(skb).dst_group = RTNLGRP_TC; |
10297b99 | 940 | |
cc7ec456 | 941 | err = rtnetlink_send(skb, net, pid, RTNLGRP_TC, flags & NLM_F_ECHO); |
1da177e4 LT |
942 | if (err > 0) |
943 | err = 0; | |
944 | return err; | |
945 | ||
7ba699c6 | 946 | nla_put_failure: |
1da177e4 | 947 | nlmsg_failure: |
f6e57464 | 948 | kfree_skb(skb); |
1da177e4 LT |
949 | return -1; |
950 | } | |
951 | ||
10297b99 | 952 | |
1da177e4 | 953 | static int |
7316ae88 TG |
954 | tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
955 | u32 pid, int ovr) | |
1da177e4 LT |
956 | { |
957 | int ret = 0; | |
958 | struct tc_action *act; | |
959 | struct tc_action *a; | |
960 | u32 seq = n->nlmsg_seq; | |
961 | ||
ab27cfb8 | 962 | act = tcf_action_init(nla, NULL, NULL, ovr, 0); |
1da177e4 LT |
963 | if (act == NULL) |
964 | goto done; | |
ab27cfb8 PM |
965 | if (IS_ERR(act)) { |
966 | ret = PTR_ERR(act); | |
967 | goto done; | |
968 | } | |
1da177e4 LT |
969 | |
970 | /* dump then free all the actions after update; inserted policy | |
971 | * stays intact | |
cc7ec456 | 972 | */ |
7316ae88 | 973 | ret = tcf_add_notify(net, act, pid, seq, RTM_NEWACTION, n->nlmsg_flags); |
1da177e4 LT |
974 | for (a = act; a; a = act) { |
975 | act = a->next; | |
976 | kfree(a); | |
977 | } | |
978 | done: | |
979 | return ret; | |
980 | } | |
981 | ||
982 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
983 | { | |
3b1e0a65 | 984 | struct net *net = sock_net(skb->sk); |
7ba699c6 | 985 | struct nlattr *tca[TCA_ACT_MAX + 1]; |
1da177e4 LT |
986 | u32 pid = skb ? NETLINK_CB(skb).pid : 0; |
987 | int ret = 0, ovr = 0; | |
988 | ||
7ba699c6 PM |
989 | ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL); |
990 | if (ret < 0) | |
991 | return ret; | |
992 | ||
993 | if (tca[TCA_ACT_TAB] == NULL) { | |
6ff9c364 | 994 | pr_notice("tc_ctl_action: received NO action attribs\n"); |
1da177e4 LT |
995 | return -EINVAL; |
996 | } | |
997 | ||
cc7ec456 | 998 | /* n->nlmsg_flags & NLM_F_CREATE */ |
1da177e4 LT |
999 | switch (n->nlmsg_type) { |
1000 | case RTM_NEWACTION: | |
1001 | /* we are going to assume all other flags | |
1002 | * imply create only if it doesnt exist | |
1003 | * Note that CREATE | EXCL implies that | |
1004 | * but since we want avoid ambiguity (eg when flags | |
1005 | * is zero) then just set this | |
1006 | */ | |
cc7ec456 | 1007 | if (n->nlmsg_flags & NLM_F_REPLACE) |
1da177e4 LT |
1008 | ovr = 1; |
1009 | replay: | |
7316ae88 | 1010 | ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, pid, ovr); |
1da177e4 LT |
1011 | if (ret == -EAGAIN) |
1012 | goto replay; | |
1013 | break; | |
1014 | case RTM_DELACTION: | |
7316ae88 TG |
1015 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
1016 | pid, RTM_DELACTION); | |
1da177e4 LT |
1017 | break; |
1018 | case RTM_GETACTION: | |
7316ae88 TG |
1019 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
1020 | pid, RTM_GETACTION); | |
1da177e4 LT |
1021 | break; |
1022 | default: | |
1023 | BUG(); | |
1024 | } | |
1025 | ||
1026 | return ret; | |
1027 | } | |
1028 | ||
7ba699c6 | 1029 | static struct nlattr * |
3a6c2b41 | 1030 | find_dump_kind(const struct nlmsghdr *n) |
1da177e4 | 1031 | { |
cc7ec456 | 1032 | struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1]; |
7ba699c6 PM |
1033 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
1034 | struct nlattr *nla[TCAA_MAX + 1]; | |
1035 | struct nlattr *kind; | |
1da177e4 | 1036 | |
c96c9471 | 1037 | if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0) |
1da177e4 | 1038 | return NULL; |
7ba699c6 | 1039 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
1040 | if (tb1 == NULL) |
1041 | return NULL; | |
1042 | ||
7ba699c6 PM |
1043 | if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), |
1044 | NLMSG_ALIGN(nla_len(tb1)), NULL) < 0) | |
1da177e4 | 1045 | return NULL; |
1da177e4 | 1046 | |
6d834e04 PM |
1047 | if (tb[1] == NULL) |
1048 | return NULL; | |
1049 | if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]), | |
1050 | nla_len(tb[1]), NULL) < 0) | |
1da177e4 | 1051 | return NULL; |
7ba699c6 | 1052 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 1053 | |
26dab893 | 1054 | return kind; |
1da177e4 LT |
1055 | } |
1056 | ||
1057 | static int | |
1058 | tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) | |
1059 | { | |
1060 | struct nlmsghdr *nlh; | |
27a884dc | 1061 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1062 | struct nlattr *nest; |
1da177e4 LT |
1063 | struct tc_action_ops *a_o; |
1064 | struct tc_action a; | |
1065 | int ret = 0; | |
1066 | struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh); | |
7ba699c6 | 1067 | struct nlattr *kind = find_dump_kind(cb->nlh); |
1da177e4 LT |
1068 | |
1069 | if (kind == NULL) { | |
6ff9c364 | 1070 | pr_info("tc_dump_action: action bad kind\n"); |
1da177e4 LT |
1071 | return 0; |
1072 | } | |
1073 | ||
26dab893 | 1074 | a_o = tc_lookup_action(kind); |
cc7ec456 | 1075 | if (a_o == NULL) |
1da177e4 | 1076 | return 0; |
1da177e4 LT |
1077 | |
1078 | memset(&a, 0, sizeof(struct tc_action)); | |
1079 | a.ops = a_o; | |
1080 | ||
1081 | if (a_o->walk == NULL) { | |
6ff9c364 | 1082 | WARN(1, "tc_dump_action: %s !capable of dumping table\n", |
1083 | a_o->kind); | |
7ba699c6 | 1084 | goto nla_put_failure; |
1da177e4 LT |
1085 | } |
1086 | ||
1087 | nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, | |
10297b99 | 1088 | cb->nlh->nlmsg_type, sizeof(*t)); |
1da177e4 LT |
1089 | t = NLMSG_DATA(nlh); |
1090 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
1091 | t->tca__pad1 = 0; |
1092 | t->tca__pad2 = 0; | |
1da177e4 | 1093 | |
4b3550ef PM |
1094 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
1095 | if (nest == NULL) | |
1096 | goto nla_put_failure; | |
1da177e4 LT |
1097 | |
1098 | ret = a_o->walk(skb, cb, RTM_GETACTION, &a); | |
1099 | if (ret < 0) | |
7ba699c6 | 1100 | goto nla_put_failure; |
1da177e4 LT |
1101 | |
1102 | if (ret > 0) { | |
4b3550ef | 1103 | nla_nest_end(skb, nest); |
1da177e4 LT |
1104 | ret = skb->len; |
1105 | } else | |
4b3550ef | 1106 | nla_nest_cancel(skb, nest); |
1da177e4 | 1107 | |
27a884dc | 1108 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1109 | if (NETLINK_CB(cb->skb).pid && ret) |
1110 | nlh->nlmsg_flags |= NLM_F_MULTI; | |
1111 | module_put(a_o->owner); | |
1112 | return skb->len; | |
1113 | ||
7ba699c6 | 1114 | nla_put_failure: |
1da177e4 LT |
1115 | nlmsg_failure: |
1116 | module_put(a_o->owner); | |
dc5fc579 | 1117 | nlmsg_trim(skb, b); |
1da177e4 LT |
1118 | return skb->len; |
1119 | } | |
1120 | ||
1121 | static int __init tc_action_init(void) | |
1122 | { | |
708914cc TG |
1123 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL); |
1124 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL); | |
1125 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action); | |
1da177e4 | 1126 | |
1da177e4 LT |
1127 | return 0; |
1128 | } | |
1129 | ||
1130 | subsys_initcall(tc_action_init); |