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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> |
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; | |
57e1c487 | 130 | NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind); |
e9ce1cd3 DM |
131 | for (i = 0; i < (hinfo->hmask + 1); i++) { |
132 | p = hinfo->htab[tcf_hash(i, hinfo->hmask)]; | |
133 | ||
134 | while (p != NULL) { | |
135 | s_p = p->tcfc_next; | |
136 | if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo)) | |
cc7ec456 | 137 | module_put(a->ops->owner); |
e9ce1cd3 DM |
138 | n_i++; |
139 | p = s_p; | |
140 | } | |
141 | } | |
24beeab5 | 142 | NLA_PUT_U32(skb, TCA_FCNT, n_i); |
4b3550ef | 143 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
144 | |
145 | return n_i; | |
7ba699c6 | 146 | nla_put_failure: |
4b3550ef | 147 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
148 | return -EINVAL; |
149 | } | |
150 | ||
151 | int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
152 | int type, struct tc_action *a) | |
153 | { | |
154 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
155 | ||
156 | if (type == RTM_DELACTION) { | |
157 | return tcf_del_walker(skb, a, hinfo); | |
158 | } else if (type == RTM_GETACTION) { | |
159 | return tcf_dump_walker(skb, cb, a, hinfo); | |
160 | } else { | |
6ff9c364 | 161 | WARN(1, "tcf_generic_walker: unknown action %d\n", type); |
e9ce1cd3 DM |
162 | return -EINVAL; |
163 | } | |
164 | } | |
165 | EXPORT_SYMBOL(tcf_generic_walker); | |
166 | ||
167 | struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo) | |
168 | { | |
169 | struct tcf_common *p; | |
170 | ||
e1e992e5 | 171 | read_lock_bh(hinfo->lock); |
e9ce1cd3 DM |
172 | for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p; |
173 | p = p->tcfc_next) { | |
174 | if (p->tcfc_index == index) | |
175 | break; | |
176 | } | |
e1e992e5 | 177 | read_unlock_bh(hinfo->lock); |
e9ce1cd3 DM |
178 | |
179 | return p; | |
180 | } | |
181 | EXPORT_SYMBOL(tcf_hash_lookup); | |
182 | ||
183 | u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo) | |
184 | { | |
185 | u32 val = *idx_gen; | |
186 | ||
187 | do { | |
188 | if (++val == 0) | |
189 | val = 1; | |
190 | } while (tcf_hash_lookup(val, hinfo)); | |
191 | ||
192 | return (*idx_gen = val); | |
193 | } | |
194 | EXPORT_SYMBOL(tcf_hash_new_index); | |
195 | ||
196 | int tcf_hash_search(struct tc_action *a, u32 index) | |
197 | { | |
198 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
199 | struct tcf_common *p = tcf_hash_lookup(index, hinfo); | |
200 | ||
201 | if (p) { | |
202 | a->priv = p; | |
203 | return 1; | |
204 | } | |
205 | return 0; | |
206 | } | |
207 | EXPORT_SYMBOL(tcf_hash_search); | |
208 | ||
209 | struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind, | |
210 | struct tcf_hashinfo *hinfo) | |
211 | { | |
212 | struct tcf_common *p = NULL; | |
213 | if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) { | |
76aab2c1 | 214 | if (bind) |
e9ce1cd3 | 215 | p->tcfc_bindcnt++; |
76aab2c1 | 216 | p->tcfc_refcnt++; |
e9ce1cd3 DM |
217 | a->priv = p; |
218 | } | |
219 | return p; | |
220 | } | |
221 | EXPORT_SYMBOL(tcf_hash_check); | |
222 | ||
0e991ec6 SH |
223 | struct tcf_common *tcf_hash_create(u32 index, struct nlattr *est, |
224 | struct tc_action *a, int size, int bind, | |
225 | u32 *idx_gen, struct tcf_hashinfo *hinfo) | |
e9ce1cd3 DM |
226 | { |
227 | struct tcf_common *p = kzalloc(size, GFP_KERNEL); | |
228 | ||
229 | if (unlikely(!p)) | |
0e991ec6 | 230 | return ERR_PTR(-ENOMEM); |
e9ce1cd3 DM |
231 | p->tcfc_refcnt = 1; |
232 | if (bind) | |
233 | p->tcfc_bindcnt = 1; | |
234 | ||
235 | spin_lock_init(&p->tcfc_lock); | |
e9ce1cd3 DM |
236 | p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo); |
237 | p->tcfc_tm.install = jiffies; | |
238 | p->tcfc_tm.lastuse = jiffies; | |
0e991ec6 SH |
239 | if (est) { |
240 | int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est, | |
241 | &p->tcfc_lock, est); | |
242 | if (err) { | |
243 | kfree(p); | |
244 | return ERR_PTR(err); | |
245 | } | |
246 | } | |
247 | ||
e9ce1cd3 DM |
248 | a->priv = (void *) p; |
249 | return p; | |
250 | } | |
251 | EXPORT_SYMBOL(tcf_hash_create); | |
252 | ||
253 | void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo) | |
254 | { | |
255 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); | |
256 | ||
257 | write_lock_bh(hinfo->lock); | |
258 | p->tcfc_next = hinfo->htab[h]; | |
259 | hinfo->htab[h] = p; | |
260 | write_unlock_bh(hinfo->lock); | |
261 | } | |
262 | EXPORT_SYMBOL(tcf_hash_insert); | |
1da177e4 LT |
263 | |
264 | static struct tc_action_ops *act_base = NULL; | |
265 | static DEFINE_RWLOCK(act_mod_lock); | |
266 | ||
267 | int tcf_register_action(struct tc_action_ops *act) | |
268 | { | |
269 | struct tc_action_ops *a, **ap; | |
270 | ||
271 | write_lock(&act_mod_lock); | |
272 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) { | |
273 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { | |
274 | write_unlock(&act_mod_lock); | |
275 | return -EEXIST; | |
276 | } | |
277 | } | |
278 | act->next = NULL; | |
279 | *ap = act; | |
280 | write_unlock(&act_mod_lock); | |
281 | return 0; | |
282 | } | |
62e3ba1b | 283 | EXPORT_SYMBOL(tcf_register_action); |
1da177e4 LT |
284 | |
285 | int tcf_unregister_action(struct tc_action_ops *act) | |
286 | { | |
287 | struct tc_action_ops *a, **ap; | |
288 | int err = -ENOENT; | |
289 | ||
290 | write_lock(&act_mod_lock); | |
291 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) | |
292 | if (a == act) | |
293 | break; | |
294 | if (a) { | |
295 | *ap = a->next; | |
296 | a->next = NULL; | |
297 | err = 0; | |
298 | } | |
299 | write_unlock(&act_mod_lock); | |
300 | return err; | |
301 | } | |
62e3ba1b | 302 | EXPORT_SYMBOL(tcf_unregister_action); |
1da177e4 LT |
303 | |
304 | /* lookup by name */ | |
305 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
306 | { | |
307 | struct tc_action_ops *a = NULL; | |
308 | ||
309 | if (kind) { | |
310 | read_lock(&act_mod_lock); | |
311 | for (a = act_base; a; a = a->next) { | |
312 | if (strcmp(kind, a->kind) == 0) { | |
313 | if (!try_module_get(a->owner)) { | |
314 | read_unlock(&act_mod_lock); | |
315 | return NULL; | |
316 | } | |
317 | break; | |
318 | } | |
319 | } | |
320 | read_unlock(&act_mod_lock); | |
321 | } | |
322 | return a; | |
323 | } | |
324 | ||
7ba699c6 PM |
325 | /* lookup by nlattr */ |
326 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) | |
1da177e4 LT |
327 | { |
328 | struct tc_action_ops *a = NULL; | |
329 | ||
330 | if (kind) { | |
331 | read_lock(&act_mod_lock); | |
332 | for (a = act_base; a; a = a->next) { | |
7ba699c6 | 333 | if (nla_strcmp(kind, a->kind) == 0) { |
1da177e4 LT |
334 | if (!try_module_get(a->owner)) { |
335 | read_unlock(&act_mod_lock); | |
336 | return NULL; | |
337 | } | |
338 | break; | |
339 | } | |
340 | } | |
341 | read_unlock(&act_mod_lock); | |
342 | } | |
343 | return a; | |
344 | } | |
345 | ||
346 | #if 0 | |
347 | /* lookup by id */ | |
348 | static struct tc_action_ops *tc_lookup_action_id(u32 type) | |
349 | { | |
350 | struct tc_action_ops *a = NULL; | |
351 | ||
352 | if (type) { | |
353 | read_lock(&act_mod_lock); | |
354 | for (a = act_base; a; a = a->next) { | |
355 | if (a->type == type) { | |
356 | if (!try_module_get(a->owner)) { | |
357 | read_unlock(&act_mod_lock); | |
358 | return NULL; | |
359 | } | |
360 | break; | |
361 | } | |
362 | } | |
363 | read_unlock(&act_mod_lock); | |
364 | } | |
365 | return a; | |
366 | } | |
367 | #endif | |
368 | ||
dc7f9f6e | 369 | int tcf_action_exec(struct sk_buff *skb, const struct tc_action *act, |
10297b99 | 370 | struct tcf_result *res) |
1da177e4 | 371 | { |
dc7f9f6e | 372 | const struct tc_action *a; |
1da177e4 LT |
373 | int ret = -1; |
374 | ||
375 | if (skb->tc_verd & TC_NCLS) { | |
376 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
1da177e4 LT |
377 | ret = TC_ACT_OK; |
378 | goto exec_done; | |
379 | } | |
380 | while ((a = act) != NULL) { | |
381 | repeat: | |
382 | if (a->ops && a->ops->act) { | |
f43c5a0d | 383 | ret = a->ops->act(skb, a, res); |
1da177e4 LT |
384 | if (TC_MUNGED & skb->tc_verd) { |
385 | /* copied already, allow trampling */ | |
386 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); | |
387 | skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd); | |
388 | } | |
1da177e4 LT |
389 | if (ret == TC_ACT_REPEAT) |
390 | goto repeat; /* we need a ttl - JHS */ | |
14d50e78 HS |
391 | if (ret != TC_ACT_PIPE) |
392 | goto exec_done; | |
1da177e4 LT |
393 | } |
394 | act = a->next; | |
395 | } | |
396 | exec_done: | |
1da177e4 LT |
397 | return ret; |
398 | } | |
62e3ba1b | 399 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 LT |
400 | |
401 | void tcf_action_destroy(struct tc_action *act, int bind) | |
402 | { | |
403 | struct tc_action *a; | |
404 | ||
405 | for (a = act; a; a = act) { | |
406 | if (a->ops && a->ops->cleanup) { | |
1da177e4 LT |
407 | if (a->ops->cleanup(a, bind) == ACT_P_DELETED) |
408 | module_put(a->ops->owner); | |
409 | act = act->next; | |
410 | kfree(a); | |
6ff9c364 | 411 | } else { |
412 | /*FIXME: Remove later - catch insertion bugs*/ | |
413 | WARN(1, "tcf_action_destroy: BUG? destroying NULL ops\n"); | |
1da177e4 LT |
414 | act = act->next; |
415 | kfree(a); | |
416 | } | |
417 | } | |
418 | } | |
419 | ||
420 | int | |
421 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
422 | { | |
423 | int err = -EINVAL; | |
424 | ||
425 | if (a->ops == NULL || a->ops->dump == NULL) | |
426 | return err; | |
427 | return a->ops->dump(skb, a, bind, ref); | |
428 | } | |
429 | ||
430 | int | |
431 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
432 | { | |
433 | int err = -EINVAL; | |
27a884dc | 434 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 435 | struct nlattr *nest; |
1da177e4 LT |
436 | |
437 | if (a->ops == NULL || a->ops->dump == NULL) | |
438 | return err; | |
439 | ||
57e1c487 | 440 | NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind); |
1da177e4 | 441 | if (tcf_action_copy_stats(skb, a, 0)) |
7ba699c6 | 442 | goto nla_put_failure; |
4b3550ef PM |
443 | nest = nla_nest_start(skb, TCA_OPTIONS); |
444 | if (nest == NULL) | |
445 | goto nla_put_failure; | |
cc7ec456 ED |
446 | err = tcf_action_dump_old(skb, a, bind, ref); |
447 | if (err > 0) { | |
4b3550ef | 448 | nla_nest_end(skb, nest); |
1da177e4 LT |
449 | return err; |
450 | } | |
451 | ||
7ba699c6 | 452 | nla_put_failure: |
dc5fc579 | 453 | nlmsg_trim(skb, b); |
1da177e4 LT |
454 | return -1; |
455 | } | |
62e3ba1b | 456 | EXPORT_SYMBOL(tcf_action_dump_1); |
1da177e4 LT |
457 | |
458 | int | |
459 | tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref) | |
460 | { | |
461 | struct tc_action *a; | |
462 | int err = -EINVAL; | |
4b3550ef | 463 | struct nlattr *nest; |
1da177e4 LT |
464 | |
465 | while ((a = act) != NULL) { | |
1da177e4 | 466 | act = a->next; |
4b3550ef PM |
467 | nest = nla_nest_start(skb, a->order); |
468 | if (nest == NULL) | |
469 | goto nla_put_failure; | |
1da177e4 LT |
470 | err = tcf_action_dump_1(skb, a, bind, ref); |
471 | if (err < 0) | |
4fe683f5 | 472 | goto errout; |
4b3550ef | 473 | nla_nest_end(skb, nest); |
1da177e4 LT |
474 | } |
475 | ||
476 | return 0; | |
477 | ||
7ba699c6 | 478 | nla_put_failure: |
4fe683f5 TG |
479 | err = -EINVAL; |
480 | errout: | |
4b3550ef | 481 | nla_nest_cancel(skb, nest); |
4fe683f5 | 482 | return err; |
1da177e4 LT |
483 | } |
484 | ||
7ba699c6 | 485 | struct tc_action *tcf_action_init_1(struct nlattr *nla, struct nlattr *est, |
ab27cfb8 | 486 | char *name, int ovr, int bind) |
1da177e4 LT |
487 | { |
488 | struct tc_action *a; | |
489 | struct tc_action_ops *a_o; | |
490 | char act_name[IFNAMSIZ]; | |
cc7ec456 | 491 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 492 | struct nlattr *kind; |
ab27cfb8 | 493 | int err; |
1da177e4 | 494 | |
1da177e4 | 495 | if (name == NULL) { |
cee63723 PM |
496 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
497 | if (err < 0) | |
1da177e4 | 498 | goto err_out; |
cee63723 | 499 | err = -EINVAL; |
7ba699c6 | 500 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
501 | if (kind == NULL) |
502 | goto err_out; | |
7ba699c6 | 503 | if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) |
1da177e4 LT |
504 | goto err_out; |
505 | } else { | |
cee63723 | 506 | err = -EINVAL; |
1da177e4 LT |
507 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) |
508 | goto err_out; | |
509 | } | |
510 | ||
511 | a_o = tc_lookup_action_n(act_name); | |
512 | if (a_o == NULL) { | |
95a5afca | 513 | #ifdef CONFIG_MODULES |
1da177e4 | 514 | rtnl_unlock(); |
4bba3925 | 515 | request_module("act_%s", act_name); |
1da177e4 LT |
516 | rtnl_lock(); |
517 | ||
518 | a_o = tc_lookup_action_n(act_name); | |
519 | ||
520 | /* We dropped the RTNL semaphore in order to | |
521 | * perform the module load. So, even if we | |
522 | * succeeded in loading the module we have to | |
523 | * tell the caller to replay the request. We | |
524 | * indicate this using -EAGAIN. | |
525 | */ | |
526 | if (a_o != NULL) { | |
ab27cfb8 | 527 | err = -EAGAIN; |
1da177e4 LT |
528 | goto err_mod; |
529 | } | |
530 | #endif | |
ab27cfb8 | 531 | err = -ENOENT; |
1da177e4 LT |
532 | goto err_out; |
533 | } | |
534 | ||
ab27cfb8 | 535 | err = -ENOMEM; |
0da974f4 | 536 | a = kzalloc(sizeof(*a), GFP_KERNEL); |
1da177e4 LT |
537 | if (a == NULL) |
538 | goto err_mod; | |
1da177e4 LT |
539 | |
540 | /* backward compatibility for policer */ | |
541 | if (name == NULL) | |
ab27cfb8 | 542 | err = a_o->init(tb[TCA_ACT_OPTIONS], est, a, ovr, bind); |
1da177e4 | 543 | else |
ab27cfb8 PM |
544 | err = a_o->init(nla, est, a, ovr, bind); |
545 | if (err < 0) | |
1da177e4 LT |
546 | goto err_free; |
547 | ||
548 | /* module count goes up only when brand new policy is created | |
cc7ec456 ED |
549 | * if it exists and is only bound to in a_o->init() then |
550 | * ACT_P_CREATED is not returned (a zero is). | |
551 | */ | |
ab27cfb8 | 552 | if (err != ACT_P_CREATED) |
1da177e4 LT |
553 | module_put(a_o->owner); |
554 | a->ops = a_o; | |
1da177e4 | 555 | |
1da177e4 LT |
556 | return a; |
557 | ||
558 | err_free: | |
559 | kfree(a); | |
560 | err_mod: | |
561 | module_put(a_o->owner); | |
562 | err_out: | |
ab27cfb8 | 563 | return ERR_PTR(err); |
1da177e4 LT |
564 | } |
565 | ||
7ba699c6 | 566 | struct tc_action *tcf_action_init(struct nlattr *nla, struct nlattr *est, |
ab27cfb8 | 567 | char *name, int ovr, int bind) |
1da177e4 | 568 | { |
cc7ec456 | 569 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
1da177e4 | 570 | struct tc_action *head = NULL, *act, *act_prev = NULL; |
cee63723 | 571 | int err; |
1da177e4 LT |
572 | int i; |
573 | ||
cee63723 PM |
574 | err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
575 | if (err < 0) | |
576 | return ERR_PTR(err); | |
1da177e4 | 577 | |
7ba699c6 | 578 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
ab27cfb8 PM |
579 | act = tcf_action_init_1(tb[i], est, name, ovr, bind); |
580 | if (IS_ERR(act)) | |
1da177e4 | 581 | goto err; |
7ba699c6 | 582 | act->order = i; |
1da177e4 LT |
583 | |
584 | if (head == NULL) | |
585 | head = act; | |
586 | else | |
587 | act_prev->next = act; | |
588 | act_prev = act; | |
589 | } | |
590 | return head; | |
591 | ||
592 | err: | |
593 | if (head != NULL) | |
594 | tcf_action_destroy(head, bind); | |
ab27cfb8 | 595 | return act; |
1da177e4 LT |
596 | } |
597 | ||
598 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a, | |
599 | int compat_mode) | |
600 | { | |
601 | int err = 0; | |
602 | struct gnet_dump d; | |
603 | struct tcf_act_hdr *h = a->priv; | |
10297b99 | 604 | |
1da177e4 LT |
605 | if (h == NULL) |
606 | goto errout; | |
607 | ||
608 | /* compat_mode being true specifies a call that is supposed | |
06fe9fb4 | 609 | * to add additional backward compatibility statistic TLVs. |
1da177e4 LT |
610 | */ |
611 | if (compat_mode) { | |
612 | if (a->type == TCA_OLD_COMPAT) | |
613 | err = gnet_stats_start_copy_compat(skb, 0, | |
4bdf3991 | 614 | TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d); |
1da177e4 LT |
615 | else |
616 | return 0; | |
617 | } else | |
618 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
4bdf3991 | 619 | &h->tcf_lock, &d); |
1da177e4 LT |
620 | |
621 | if (err < 0) | |
622 | goto errout; | |
623 | ||
624 | if (a->ops != NULL && a->ops->get_stats != NULL) | |
625 | if (a->ops->get_stats(skb, a) < 0) | |
626 | goto errout; | |
627 | ||
e9ce1cd3 | 628 | if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 || |
d250a5f9 ED |
629 | gnet_stats_copy_rate_est(&d, &h->tcf_bstats, |
630 | &h->tcf_rate_est) < 0 || | |
e9ce1cd3 | 631 | gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0) |
1da177e4 LT |
632 | goto errout; |
633 | ||
634 | if (gnet_stats_finish_copy(&d) < 0) | |
635 | goto errout; | |
636 | ||
637 | return 0; | |
638 | ||
639 | errout: | |
640 | return -1; | |
641 | } | |
642 | ||
643 | static int | |
644 | tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq, | |
10297b99 | 645 | u16 flags, int event, int bind, int ref) |
1da177e4 LT |
646 | { |
647 | struct tcamsg *t; | |
648 | struct nlmsghdr *nlh; | |
27a884dc | 649 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 650 | struct nlattr *nest; |
1da177e4 | 651 | |
e431b8c0 JHS |
652 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
653 | ||
1da177e4 LT |
654 | t = NLMSG_DATA(nlh); |
655 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
656 | t->tca__pad1 = 0; |
657 | t->tca__pad2 = 0; | |
10297b99 | 658 | |
4b3550ef PM |
659 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
660 | if (nest == NULL) | |
661 | goto nla_put_failure; | |
1da177e4 LT |
662 | |
663 | if (tcf_action_dump(skb, a, bind, ref) < 0) | |
7ba699c6 | 664 | goto nla_put_failure; |
1da177e4 | 665 | |
4b3550ef | 666 | nla_nest_end(skb, nest); |
10297b99 | 667 | |
27a884dc | 668 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
669 | return skb->len; |
670 | ||
7ba699c6 | 671 | nla_put_failure: |
1da177e4 | 672 | nlmsg_failure: |
dc5fc579 | 673 | nlmsg_trim(skb, b); |
1da177e4 LT |
674 | return -1; |
675 | } | |
676 | ||
677 | static int | |
7316ae88 TG |
678 | act_get_notify(struct net *net, u32 pid, struct nlmsghdr *n, |
679 | struct tc_action *a, int event) | |
1da177e4 LT |
680 | { |
681 | struct sk_buff *skb; | |
1da177e4 LT |
682 | |
683 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
684 | if (!skb) | |
685 | return -ENOBUFS; | |
686 | if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { | |
687 | kfree_skb(skb); | |
688 | return -EINVAL; | |
689 | } | |
2942e900 | 690 | |
7316ae88 | 691 | return rtnl_unicast(skb, net, pid); |
1da177e4 LT |
692 | } |
693 | ||
694 | static struct tc_action * | |
ab27cfb8 | 695 | tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid) |
1da177e4 | 696 | { |
cc7ec456 | 697 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
1da177e4 LT |
698 | struct tc_action *a; |
699 | int index; | |
ab27cfb8 | 700 | int err; |
1da177e4 | 701 | |
cee63723 PM |
702 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
703 | if (err < 0) | |
ab27cfb8 | 704 | goto err_out; |
1da177e4 | 705 | |
cee63723 | 706 | err = -EINVAL; |
7ba699c6 PM |
707 | if (tb[TCA_ACT_INDEX] == NULL || |
708 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) | |
ab27cfb8 | 709 | goto err_out; |
1587bac4 | 710 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 711 | |
ab27cfb8 | 712 | err = -ENOMEM; |
0da974f4 | 713 | a = kzalloc(sizeof(struct tc_action), GFP_KERNEL); |
1da177e4 | 714 | if (a == NULL) |
ab27cfb8 | 715 | goto err_out; |
1da177e4 | 716 | |
ab27cfb8 | 717 | err = -EINVAL; |
7ba699c6 | 718 | a->ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
1da177e4 LT |
719 | if (a->ops == NULL) |
720 | goto err_free; | |
721 | if (a->ops->lookup == NULL) | |
722 | goto err_mod; | |
ab27cfb8 | 723 | err = -ENOENT; |
1da177e4 LT |
724 | if (a->ops->lookup(a, index) == 0) |
725 | goto err_mod; | |
726 | ||
727 | module_put(a->ops->owner); | |
1da177e4 | 728 | return a; |
ab27cfb8 | 729 | |
1da177e4 LT |
730 | err_mod: |
731 | module_put(a->ops->owner); | |
732 | err_free: | |
733 | kfree(a); | |
ab27cfb8 PM |
734 | err_out: |
735 | return ERR_PTR(err); | |
1da177e4 LT |
736 | } |
737 | ||
738 | static void cleanup_a(struct tc_action *act) | |
739 | { | |
740 | struct tc_action *a; | |
741 | ||
742 | for (a = act; a; a = act) { | |
743 | act = a->next; | |
744 | kfree(a); | |
745 | } | |
746 | } | |
747 | ||
748 | static struct tc_action *create_a(int i) | |
749 | { | |
750 | struct tc_action *act; | |
751 | ||
0da974f4 | 752 | act = kzalloc(sizeof(*act), GFP_KERNEL); |
1da177e4 | 753 | if (act == NULL) { |
6ff9c364 | 754 | pr_debug("create_a: failed to alloc!\n"); |
1da177e4 LT |
755 | return NULL; |
756 | } | |
1da177e4 LT |
757 | act->order = i; |
758 | return act; | |
759 | } | |
760 | ||
7316ae88 TG |
761 | static int tca_action_flush(struct net *net, struct nlattr *nla, |
762 | struct nlmsghdr *n, u32 pid) | |
1da177e4 LT |
763 | { |
764 | struct sk_buff *skb; | |
765 | unsigned char *b; | |
766 | struct nlmsghdr *nlh; | |
767 | struct tcamsg *t; | |
768 | struct netlink_callback dcb; | |
4b3550ef | 769 | struct nlattr *nest; |
cc7ec456 | 770 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 771 | struct nlattr *kind; |
1da177e4 | 772 | struct tc_action *a = create_a(0); |
36723873 | 773 | int err = -ENOMEM; |
1da177e4 LT |
774 | |
775 | if (a == NULL) { | |
6ff9c364 | 776 | pr_debug("tca_action_flush: couldnt create tc_action\n"); |
1da177e4 LT |
777 | return err; |
778 | } | |
779 | ||
780 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
781 | if (!skb) { | |
6ff9c364 | 782 | pr_debug("tca_action_flush: failed skb alloc\n"); |
1da177e4 | 783 | kfree(a); |
36723873 | 784 | return err; |
1da177e4 LT |
785 | } |
786 | ||
27a884dc | 787 | b = skb_tail_pointer(skb); |
1da177e4 | 788 | |
cee63723 PM |
789 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
790 | if (err < 0) | |
1da177e4 LT |
791 | goto err_out; |
792 | ||
cee63723 | 793 | err = -EINVAL; |
7ba699c6 | 794 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
795 | a->ops = tc_lookup_action(kind); |
796 | if (a->ops == NULL) | |
797 | goto err_out; | |
798 | ||
799 | nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t)); | |
800 | t = NLMSG_DATA(nlh); | |
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) | |
807 | goto nla_put_failure; | |
1da177e4 LT |
808 | |
809 | err = a->ops->walk(skb, &dcb, RTM_DELACTION, a); | |
810 | if (err < 0) | |
7ba699c6 | 811 | goto nla_put_failure; |
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); | |
cc7ec456 ED |
821 | err = rtnetlink_send(skb, net, pid, RTNLGRP_TC, |
822 | n->nlmsg_flags & NLM_F_ECHO); | |
1da177e4 LT |
823 | if (err > 0) |
824 | return 0; | |
825 | ||
826 | return err; | |
827 | ||
7ba699c6 | 828 | nla_put_failure: |
1da177e4 | 829 | nlmsg_failure: |
ebbaeab1 | 830 | module_put(a->ops->owner); |
1da177e4 | 831 | err_out: |
f97017cd | 832 | noflush_out: |
1da177e4 LT |
833 | kfree_skb(skb); |
834 | kfree(a); | |
835 | return err; | |
836 | } | |
837 | ||
838 | static int | |
7316ae88 TG |
839 | tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
840 | u32 pid, int event) | |
1da177e4 | 841 | { |
cee63723 | 842 | int i, ret; |
cc7ec456 | 843 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
1da177e4 LT |
844 | struct tc_action *head = NULL, *act, *act_prev = NULL; |
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) |
7316ae88 | 852 | return tca_action_flush(net, tb[1], n, pid); |
f97017cd JHS |
853 | else |
854 | return -EINVAL; | |
1da177e4 LT |
855 | } |
856 | ||
7ba699c6 | 857 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
ab27cfb8 PM |
858 | act = tcf_action_get_1(tb[i], n, pid); |
859 | if (IS_ERR(act)) { | |
860 | ret = PTR_ERR(act); | |
1da177e4 | 861 | goto err; |
ab27cfb8 | 862 | } |
7ba699c6 | 863 | act->order = i; |
1da177e4 LT |
864 | |
865 | if (head == NULL) | |
866 | head = act; | |
867 | else | |
868 | act_prev->next = act; | |
869 | act_prev = act; | |
870 | } | |
871 | ||
872 | if (event == RTM_GETACTION) | |
7316ae88 | 873 | ret = act_get_notify(net, pid, n, head, event); |
1da177e4 LT |
874 | else { /* delete */ |
875 | struct sk_buff *skb; | |
876 | ||
877 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
878 | if (!skb) { | |
879 | ret = -ENOBUFS; | |
880 | goto err; | |
881 | } | |
882 | ||
883 | if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event, | |
10297b99 | 884 | 0, 1) <= 0) { |
1da177e4 LT |
885 | kfree_skb(skb); |
886 | ret = -EINVAL; | |
887 | goto err; | |
888 | } | |
889 | ||
890 | /* now do the delete */ | |
891 | tcf_action_destroy(head, 0); | |
7316ae88 | 892 | ret = rtnetlink_send(skb, net, pid, RTNLGRP_TC, |
cc7ec456 | 893 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
894 | if (ret > 0) |
895 | return 0; | |
896 | return ret; | |
897 | } | |
898 | err: | |
899 | cleanup_a(head); | |
900 | return ret; | |
901 | } | |
902 | ||
7316ae88 TG |
903 | static int tcf_add_notify(struct net *net, struct tc_action *a, |
904 | u32 pid, u32 seq, int event, u16 flags) | |
1da177e4 LT |
905 | { |
906 | struct tcamsg *t; | |
907 | struct nlmsghdr *nlh; | |
908 | struct sk_buff *skb; | |
4b3550ef | 909 | struct nlattr *nest; |
1da177e4 LT |
910 | unsigned char *b; |
911 | int err = 0; | |
912 | ||
913 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
914 | if (!skb) | |
915 | return -ENOBUFS; | |
916 | ||
27a884dc | 917 | b = skb_tail_pointer(skb); |
1da177e4 | 918 | |
e431b8c0 | 919 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
1da177e4 LT |
920 | t = NLMSG_DATA(nlh); |
921 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
922 | t->tca__pad1 = 0; |
923 | t->tca__pad2 = 0; | |
924 | ||
4b3550ef PM |
925 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
926 | if (nest == NULL) | |
927 | goto nla_put_failure; | |
1da177e4 LT |
928 | |
929 | if (tcf_action_dump(skb, a, 0, 0) < 0) | |
7ba699c6 | 930 | goto nla_put_failure; |
1da177e4 | 931 | |
4b3550ef | 932 | nla_nest_end(skb, nest); |
10297b99 | 933 | |
27a884dc | 934 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
ac6d439d | 935 | NETLINK_CB(skb).dst_group = RTNLGRP_TC; |
10297b99 | 936 | |
cc7ec456 | 937 | err = rtnetlink_send(skb, net, pid, RTNLGRP_TC, flags & NLM_F_ECHO); |
1da177e4 LT |
938 | if (err > 0) |
939 | err = 0; | |
940 | return err; | |
941 | ||
7ba699c6 | 942 | nla_put_failure: |
1da177e4 | 943 | nlmsg_failure: |
f6e57464 | 944 | kfree_skb(skb); |
1da177e4 LT |
945 | return -1; |
946 | } | |
947 | ||
10297b99 | 948 | |
1da177e4 | 949 | static int |
7316ae88 TG |
950 | tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
951 | u32 pid, int ovr) | |
1da177e4 LT |
952 | { |
953 | int ret = 0; | |
954 | struct tc_action *act; | |
955 | struct tc_action *a; | |
956 | u32 seq = n->nlmsg_seq; | |
957 | ||
ab27cfb8 | 958 | act = tcf_action_init(nla, NULL, NULL, ovr, 0); |
1da177e4 LT |
959 | if (act == NULL) |
960 | goto done; | |
ab27cfb8 PM |
961 | if (IS_ERR(act)) { |
962 | ret = PTR_ERR(act); | |
963 | goto done; | |
964 | } | |
1da177e4 LT |
965 | |
966 | /* dump then free all the actions after update; inserted policy | |
967 | * stays intact | |
cc7ec456 | 968 | */ |
7316ae88 | 969 | ret = tcf_add_notify(net, act, pid, seq, RTM_NEWACTION, n->nlmsg_flags); |
1da177e4 LT |
970 | for (a = act; a; a = act) { |
971 | act = a->next; | |
972 | kfree(a); | |
973 | } | |
974 | done: | |
975 | return ret; | |
976 | } | |
977 | ||
978 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
979 | { | |
3b1e0a65 | 980 | struct net *net = sock_net(skb->sk); |
7ba699c6 | 981 | struct nlattr *tca[TCA_ACT_MAX + 1]; |
1da177e4 LT |
982 | u32 pid = skb ? NETLINK_CB(skb).pid : 0; |
983 | int ret = 0, ovr = 0; | |
984 | ||
7ba699c6 PM |
985 | ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL); |
986 | if (ret < 0) | |
987 | return ret; | |
988 | ||
989 | if (tca[TCA_ACT_TAB] == NULL) { | |
6ff9c364 | 990 | pr_notice("tc_ctl_action: received NO action attribs\n"); |
1da177e4 LT |
991 | return -EINVAL; |
992 | } | |
993 | ||
cc7ec456 | 994 | /* n->nlmsg_flags & NLM_F_CREATE */ |
1da177e4 LT |
995 | switch (n->nlmsg_type) { |
996 | case RTM_NEWACTION: | |
997 | /* we are going to assume all other flags | |
25985edc | 998 | * imply create only if it doesn't exist |
1da177e4 LT |
999 | * Note that CREATE | EXCL implies that |
1000 | * but since we want avoid ambiguity (eg when flags | |
1001 | * is zero) then just set this | |
1002 | */ | |
cc7ec456 | 1003 | if (n->nlmsg_flags & NLM_F_REPLACE) |
1da177e4 LT |
1004 | ovr = 1; |
1005 | replay: | |
7316ae88 | 1006 | ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, pid, ovr); |
1da177e4 LT |
1007 | if (ret == -EAGAIN) |
1008 | goto replay; | |
1009 | break; | |
1010 | case RTM_DELACTION: | |
7316ae88 TG |
1011 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
1012 | pid, RTM_DELACTION); | |
1da177e4 LT |
1013 | break; |
1014 | case RTM_GETACTION: | |
7316ae88 TG |
1015 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
1016 | pid, RTM_GETACTION); | |
1da177e4 LT |
1017 | break; |
1018 | default: | |
1019 | BUG(); | |
1020 | } | |
1021 | ||
1022 | return ret; | |
1023 | } | |
1024 | ||
7ba699c6 | 1025 | static struct nlattr * |
3a6c2b41 | 1026 | find_dump_kind(const struct nlmsghdr *n) |
1da177e4 | 1027 | { |
cc7ec456 | 1028 | struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1]; |
7ba699c6 PM |
1029 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
1030 | struct nlattr *nla[TCAA_MAX + 1]; | |
1031 | struct nlattr *kind; | |
1da177e4 | 1032 | |
c96c9471 | 1033 | if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0) |
1da177e4 | 1034 | return NULL; |
7ba699c6 | 1035 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
1036 | if (tb1 == NULL) |
1037 | return NULL; | |
1038 | ||
7ba699c6 PM |
1039 | if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), |
1040 | NLMSG_ALIGN(nla_len(tb1)), NULL) < 0) | |
1da177e4 | 1041 | return NULL; |
1da177e4 | 1042 | |
6d834e04 PM |
1043 | if (tb[1] == NULL) |
1044 | return NULL; | |
1045 | if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]), | |
1046 | nla_len(tb[1]), NULL) < 0) | |
1da177e4 | 1047 | return NULL; |
7ba699c6 | 1048 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 1049 | |
26dab893 | 1050 | return kind; |
1da177e4 LT |
1051 | } |
1052 | ||
1053 | static int | |
1054 | tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) | |
1055 | { | |
1056 | struct nlmsghdr *nlh; | |
27a884dc | 1057 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1058 | struct nlattr *nest; |
1da177e4 LT |
1059 | struct tc_action_ops *a_o; |
1060 | struct tc_action a; | |
1061 | int ret = 0; | |
1062 | struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh); | |
7ba699c6 | 1063 | struct nlattr *kind = find_dump_kind(cb->nlh); |
1da177e4 LT |
1064 | |
1065 | if (kind == NULL) { | |
6ff9c364 | 1066 | pr_info("tc_dump_action: action bad kind\n"); |
1da177e4 LT |
1067 | return 0; |
1068 | } | |
1069 | ||
26dab893 | 1070 | a_o = tc_lookup_action(kind); |
cc7ec456 | 1071 | if (a_o == NULL) |
1da177e4 | 1072 | return 0; |
1da177e4 LT |
1073 | |
1074 | memset(&a, 0, sizeof(struct tc_action)); | |
1075 | a.ops = a_o; | |
1076 | ||
1077 | if (a_o->walk == NULL) { | |
6ff9c364 | 1078 | WARN(1, "tc_dump_action: %s !capable of dumping table\n", |
1079 | a_o->kind); | |
7ba699c6 | 1080 | goto nla_put_failure; |
1da177e4 LT |
1081 | } |
1082 | ||
1083 | nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, | |
10297b99 | 1084 | cb->nlh->nlmsg_type, sizeof(*t)); |
1da177e4 LT |
1085 | t = NLMSG_DATA(nlh); |
1086 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
1087 | t->tca__pad1 = 0; |
1088 | t->tca__pad2 = 0; | |
1da177e4 | 1089 | |
4b3550ef PM |
1090 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
1091 | if (nest == NULL) | |
1092 | goto nla_put_failure; | |
1da177e4 LT |
1093 | |
1094 | ret = a_o->walk(skb, cb, RTM_GETACTION, &a); | |
1095 | if (ret < 0) | |
7ba699c6 | 1096 | goto nla_put_failure; |
1da177e4 LT |
1097 | |
1098 | if (ret > 0) { | |
4b3550ef | 1099 | nla_nest_end(skb, nest); |
1da177e4 LT |
1100 | ret = skb->len; |
1101 | } else | |
4b3550ef | 1102 | nla_nest_cancel(skb, nest); |
1da177e4 | 1103 | |
27a884dc | 1104 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1105 | if (NETLINK_CB(cb->skb).pid && ret) |
1106 | nlh->nlmsg_flags |= NLM_F_MULTI; | |
1107 | module_put(a_o->owner); | |
1108 | return skb->len; | |
1109 | ||
7ba699c6 | 1110 | nla_put_failure: |
1da177e4 LT |
1111 | nlmsg_failure: |
1112 | module_put(a_o->owner); | |
dc5fc579 | 1113 | nlmsg_trim(skb, b); |
1da177e4 LT |
1114 | return skb->len; |
1115 | } | |
1116 | ||
1117 | static int __init tc_action_init(void) | |
1118 | { | |
c7ac8679 GR |
1119 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL); |
1120 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL); | |
1121 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, | |
1122 | NULL); | |
1da177e4 | 1123 | |
1da177e4 LT |
1124 | return 0; |
1125 | } | |
1126 | ||
1127 | subsys_initcall(tc_action_init); |