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> |
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 | |
e9ce1cd3 DM |
29 | void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo) |
30 | { | |
31 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); | |
32 | struct tcf_common **p1p; | |
33 | ||
34 | for (p1p = &hinfo->htab[h]; *p1p; p1p = &(*p1p)->tcfc_next) { | |
35 | if (*p1p == p) { | |
36 | write_lock_bh(hinfo->lock); | |
37 | *p1p = p->tcfc_next; | |
38 | write_unlock_bh(hinfo->lock); | |
e9ce1cd3 DM |
39 | gen_kill_estimator(&p->tcfc_bstats, |
40 | &p->tcfc_rate_est); | |
e9ce1cd3 DM |
41 | kfree(p); |
42 | return; | |
43 | } | |
44 | } | |
547b792c | 45 | WARN_ON(1); |
e9ce1cd3 DM |
46 | } |
47 | EXPORT_SYMBOL(tcf_hash_destroy); | |
48 | ||
49 | int tcf_hash_release(struct tcf_common *p, int bind, | |
50 | struct tcf_hashinfo *hinfo) | |
51 | { | |
52 | int ret = 0; | |
53 | ||
54 | if (p) { | |
55 | if (bind) | |
56 | p->tcfc_bindcnt--; | |
57 | ||
58 | p->tcfc_refcnt--; | |
10297b99 | 59 | if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) { |
e9ce1cd3 DM |
60 | tcf_hash_destroy(p, hinfo); |
61 | ret = 1; | |
62 | } | |
63 | } | |
64 | return ret; | |
65 | } | |
66 | EXPORT_SYMBOL(tcf_hash_release); | |
67 | ||
68 | static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
69 | struct tc_action *a, struct tcf_hashinfo *hinfo) | |
70 | { | |
71 | struct tcf_common *p; | |
72 | int err = 0, index = -1,i = 0, s_i = 0, n_i = 0; | |
4b3550ef | 73 | struct nlattr *nest; |
e9ce1cd3 | 74 | |
e1e992e5 | 75 | read_lock_bh(hinfo->lock); |
e9ce1cd3 DM |
76 | |
77 | s_i = cb->args[0]; | |
78 | ||
79 | for (i = 0; i < (hinfo->hmask + 1); i++) { | |
80 | p = hinfo->htab[tcf_hash(i, hinfo->hmask)]; | |
81 | ||
82 | for (; p; p = p->tcfc_next) { | |
83 | index++; | |
84 | if (index < s_i) | |
85 | continue; | |
86 | a->priv = p; | |
87 | a->order = n_i; | |
4b3550ef PM |
88 | |
89 | nest = nla_nest_start(skb, a->order); | |
90 | if (nest == NULL) | |
91 | goto nla_put_failure; | |
e9ce1cd3 DM |
92 | err = tcf_action_dump_1(skb, a, 0, 0); |
93 | if (err < 0) { | |
94 | index--; | |
4b3550ef | 95 | nlmsg_trim(skb, nest); |
e9ce1cd3 DM |
96 | goto done; |
97 | } | |
4b3550ef | 98 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
99 | n_i++; |
100 | if (n_i >= TCA_ACT_MAX_PRIO) | |
101 | goto done; | |
102 | } | |
103 | } | |
104 | done: | |
e1e992e5 | 105 | read_unlock_bh(hinfo->lock); |
e9ce1cd3 DM |
106 | if (n_i) |
107 | cb->args[0] += n_i; | |
108 | return n_i; | |
109 | ||
7ba699c6 | 110 | nla_put_failure: |
4b3550ef | 111 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
112 | goto done; |
113 | } | |
114 | ||
115 | static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a, | |
116 | struct tcf_hashinfo *hinfo) | |
117 | { | |
118 | struct tcf_common *p, *s_p; | |
4b3550ef | 119 | struct nlattr *nest; |
e9ce1cd3 DM |
120 | int i= 0, n_i = 0; |
121 | ||
4b3550ef PM |
122 | nest = nla_nest_start(skb, a->order); |
123 | if (nest == NULL) | |
124 | goto nla_put_failure; | |
57e1c487 | 125 | NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind); |
e9ce1cd3 DM |
126 | for (i = 0; i < (hinfo->hmask + 1); i++) { |
127 | p = hinfo->htab[tcf_hash(i, hinfo->hmask)]; | |
128 | ||
129 | while (p != NULL) { | |
130 | s_p = p->tcfc_next; | |
131 | if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo)) | |
132 | module_put(a->ops->owner); | |
133 | n_i++; | |
134 | p = s_p; | |
135 | } | |
136 | } | |
24beeab5 | 137 | NLA_PUT_U32(skb, TCA_FCNT, n_i); |
4b3550ef | 138 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
139 | |
140 | return n_i; | |
7ba699c6 | 141 | nla_put_failure: |
4b3550ef | 142 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
143 | return -EINVAL; |
144 | } | |
145 | ||
146 | int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
147 | int type, struct tc_action *a) | |
148 | { | |
149 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
150 | ||
151 | if (type == RTM_DELACTION) { | |
152 | return tcf_del_walker(skb, a, hinfo); | |
153 | } else if (type == RTM_GETACTION) { | |
154 | return tcf_dump_walker(skb, cb, a, hinfo); | |
155 | } else { | |
6ff9c364 | 156 | WARN(1, "tcf_generic_walker: unknown action %d\n", type); |
e9ce1cd3 DM |
157 | return -EINVAL; |
158 | } | |
159 | } | |
160 | EXPORT_SYMBOL(tcf_generic_walker); | |
161 | ||
162 | struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo) | |
163 | { | |
164 | struct tcf_common *p; | |
165 | ||
e1e992e5 | 166 | read_lock_bh(hinfo->lock); |
e9ce1cd3 DM |
167 | for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p; |
168 | p = p->tcfc_next) { | |
169 | if (p->tcfc_index == index) | |
170 | break; | |
171 | } | |
e1e992e5 | 172 | read_unlock_bh(hinfo->lock); |
e9ce1cd3 DM |
173 | |
174 | return p; | |
175 | } | |
176 | EXPORT_SYMBOL(tcf_hash_lookup); | |
177 | ||
178 | u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo) | |
179 | { | |
180 | u32 val = *idx_gen; | |
181 | ||
182 | do { | |
183 | if (++val == 0) | |
184 | val = 1; | |
185 | } while (tcf_hash_lookup(val, hinfo)); | |
186 | ||
187 | return (*idx_gen = val); | |
188 | } | |
189 | EXPORT_SYMBOL(tcf_hash_new_index); | |
190 | ||
191 | int tcf_hash_search(struct tc_action *a, u32 index) | |
192 | { | |
193 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
194 | struct tcf_common *p = tcf_hash_lookup(index, hinfo); | |
195 | ||
196 | if (p) { | |
197 | a->priv = p; | |
198 | return 1; | |
199 | } | |
200 | return 0; | |
201 | } | |
202 | EXPORT_SYMBOL(tcf_hash_search); | |
203 | ||
204 | struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind, | |
205 | struct tcf_hashinfo *hinfo) | |
206 | { | |
207 | struct tcf_common *p = NULL; | |
208 | if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) { | |
76aab2c1 | 209 | if (bind) |
e9ce1cd3 | 210 | p->tcfc_bindcnt++; |
76aab2c1 | 211 | p->tcfc_refcnt++; |
e9ce1cd3 DM |
212 | a->priv = p; |
213 | } | |
214 | return p; | |
215 | } | |
216 | EXPORT_SYMBOL(tcf_hash_check); | |
217 | ||
0e991ec6 SH |
218 | struct tcf_common *tcf_hash_create(u32 index, struct nlattr *est, |
219 | struct tc_action *a, int size, int bind, | |
220 | u32 *idx_gen, struct tcf_hashinfo *hinfo) | |
e9ce1cd3 DM |
221 | { |
222 | struct tcf_common *p = kzalloc(size, GFP_KERNEL); | |
223 | ||
224 | if (unlikely(!p)) | |
0e991ec6 | 225 | return ERR_PTR(-ENOMEM); |
e9ce1cd3 DM |
226 | p->tcfc_refcnt = 1; |
227 | if (bind) | |
228 | p->tcfc_bindcnt = 1; | |
229 | ||
230 | spin_lock_init(&p->tcfc_lock); | |
e9ce1cd3 DM |
231 | p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo); |
232 | p->tcfc_tm.install = jiffies; | |
233 | p->tcfc_tm.lastuse = jiffies; | |
0e991ec6 SH |
234 | if (est) { |
235 | int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est, | |
236 | &p->tcfc_lock, est); | |
237 | if (err) { | |
238 | kfree(p); | |
239 | return ERR_PTR(err); | |
240 | } | |
241 | } | |
242 | ||
e9ce1cd3 DM |
243 | a->priv = (void *) p; |
244 | return p; | |
245 | } | |
246 | EXPORT_SYMBOL(tcf_hash_create); | |
247 | ||
248 | void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo) | |
249 | { | |
250 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); | |
251 | ||
252 | write_lock_bh(hinfo->lock); | |
253 | p->tcfc_next = hinfo->htab[h]; | |
254 | hinfo->htab[h] = p; | |
255 | write_unlock_bh(hinfo->lock); | |
256 | } | |
257 | EXPORT_SYMBOL(tcf_hash_insert); | |
1da177e4 LT |
258 | |
259 | static struct tc_action_ops *act_base = NULL; | |
260 | static DEFINE_RWLOCK(act_mod_lock); | |
261 | ||
262 | int tcf_register_action(struct tc_action_ops *act) | |
263 | { | |
264 | struct tc_action_ops *a, **ap; | |
265 | ||
266 | write_lock(&act_mod_lock); | |
267 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) { | |
268 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { | |
269 | write_unlock(&act_mod_lock); | |
270 | return -EEXIST; | |
271 | } | |
272 | } | |
273 | act->next = NULL; | |
274 | *ap = act; | |
275 | write_unlock(&act_mod_lock); | |
276 | return 0; | |
277 | } | |
62e3ba1b | 278 | EXPORT_SYMBOL(tcf_register_action); |
1da177e4 LT |
279 | |
280 | int tcf_unregister_action(struct tc_action_ops *act) | |
281 | { | |
282 | struct tc_action_ops *a, **ap; | |
283 | int err = -ENOENT; | |
284 | ||
285 | write_lock(&act_mod_lock); | |
286 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) | |
287 | if (a == act) | |
288 | break; | |
289 | if (a) { | |
290 | *ap = a->next; | |
291 | a->next = NULL; | |
292 | err = 0; | |
293 | } | |
294 | write_unlock(&act_mod_lock); | |
295 | return err; | |
296 | } | |
62e3ba1b | 297 | EXPORT_SYMBOL(tcf_unregister_action); |
1da177e4 LT |
298 | |
299 | /* lookup by name */ | |
300 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
301 | { | |
302 | struct tc_action_ops *a = NULL; | |
303 | ||
304 | if (kind) { | |
305 | read_lock(&act_mod_lock); | |
306 | for (a = act_base; a; a = a->next) { | |
307 | if (strcmp(kind, a->kind) == 0) { | |
308 | if (!try_module_get(a->owner)) { | |
309 | read_unlock(&act_mod_lock); | |
310 | return NULL; | |
311 | } | |
312 | break; | |
313 | } | |
314 | } | |
315 | read_unlock(&act_mod_lock); | |
316 | } | |
317 | return a; | |
318 | } | |
319 | ||
7ba699c6 PM |
320 | /* lookup by nlattr */ |
321 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) | |
1da177e4 LT |
322 | { |
323 | struct tc_action_ops *a = NULL; | |
324 | ||
325 | if (kind) { | |
326 | read_lock(&act_mod_lock); | |
327 | for (a = act_base; a; a = a->next) { | |
7ba699c6 | 328 | if (nla_strcmp(kind, a->kind) == 0) { |
1da177e4 LT |
329 | if (!try_module_get(a->owner)) { |
330 | read_unlock(&act_mod_lock); | |
331 | return NULL; | |
332 | } | |
333 | break; | |
334 | } | |
335 | } | |
336 | read_unlock(&act_mod_lock); | |
337 | } | |
338 | return a; | |
339 | } | |
340 | ||
341 | #if 0 | |
342 | /* lookup by id */ | |
343 | static struct tc_action_ops *tc_lookup_action_id(u32 type) | |
344 | { | |
345 | struct tc_action_ops *a = NULL; | |
346 | ||
347 | if (type) { | |
348 | read_lock(&act_mod_lock); | |
349 | for (a = act_base; a; a = a->next) { | |
350 | if (a->type == type) { | |
351 | if (!try_module_get(a->owner)) { | |
352 | read_unlock(&act_mod_lock); | |
353 | return NULL; | |
354 | } | |
355 | break; | |
356 | } | |
357 | } | |
358 | read_unlock(&act_mod_lock); | |
359 | } | |
360 | return a; | |
361 | } | |
362 | #endif | |
363 | ||
364 | int tcf_action_exec(struct sk_buff *skb, struct tc_action *act, | |
10297b99 | 365 | struct tcf_result *res) |
1da177e4 LT |
366 | { |
367 | struct tc_action *a; | |
368 | int ret = -1; | |
369 | ||
370 | if (skb->tc_verd & TC_NCLS) { | |
371 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
1da177e4 LT |
372 | ret = TC_ACT_OK; |
373 | goto exec_done; | |
374 | } | |
375 | while ((a = act) != NULL) { | |
376 | repeat: | |
377 | if (a->ops && a->ops->act) { | |
f43c5a0d | 378 | ret = a->ops->act(skb, a, res); |
1da177e4 LT |
379 | if (TC_MUNGED & skb->tc_verd) { |
380 | /* copied already, allow trampling */ | |
381 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); | |
382 | skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd); | |
383 | } | |
1da177e4 LT |
384 | if (ret == TC_ACT_REPEAT) |
385 | goto repeat; /* we need a ttl - JHS */ | |
14d50e78 HS |
386 | if (ret != TC_ACT_PIPE) |
387 | goto exec_done; | |
1da177e4 LT |
388 | } |
389 | act = a->next; | |
390 | } | |
391 | exec_done: | |
1da177e4 LT |
392 | return ret; |
393 | } | |
62e3ba1b | 394 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 LT |
395 | |
396 | void tcf_action_destroy(struct tc_action *act, int bind) | |
397 | { | |
398 | struct tc_action *a; | |
399 | ||
400 | for (a = act; a; a = act) { | |
401 | if (a->ops && a->ops->cleanup) { | |
1da177e4 LT |
402 | if (a->ops->cleanup(a, bind) == ACT_P_DELETED) |
403 | module_put(a->ops->owner); | |
404 | act = act->next; | |
405 | kfree(a); | |
6ff9c364 | 406 | } else { |
407 | /*FIXME: Remove later - catch insertion bugs*/ | |
408 | WARN(1, "tcf_action_destroy: BUG? destroying NULL ops\n"); | |
1da177e4 LT |
409 | act = act->next; |
410 | kfree(a); | |
411 | } | |
412 | } | |
413 | } | |
414 | ||
415 | int | |
416 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
417 | { | |
418 | int err = -EINVAL; | |
419 | ||
420 | if (a->ops == NULL || a->ops->dump == NULL) | |
421 | return err; | |
422 | return a->ops->dump(skb, a, bind, ref); | |
423 | } | |
424 | ||
425 | int | |
426 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
427 | { | |
428 | int err = -EINVAL; | |
27a884dc | 429 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 430 | struct nlattr *nest; |
1da177e4 LT |
431 | |
432 | if (a->ops == NULL || a->ops->dump == NULL) | |
433 | return err; | |
434 | ||
57e1c487 | 435 | NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind); |
1da177e4 | 436 | if (tcf_action_copy_stats(skb, a, 0)) |
7ba699c6 | 437 | goto nla_put_failure; |
4b3550ef PM |
438 | nest = nla_nest_start(skb, TCA_OPTIONS); |
439 | if (nest == NULL) | |
440 | goto nla_put_failure; | |
1da177e4 | 441 | if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) { |
4b3550ef | 442 | nla_nest_end(skb, nest); |
1da177e4 LT |
443 | return err; |
444 | } | |
445 | ||
7ba699c6 | 446 | nla_put_failure: |
dc5fc579 | 447 | nlmsg_trim(skb, b); |
1da177e4 LT |
448 | return -1; |
449 | } | |
62e3ba1b | 450 | EXPORT_SYMBOL(tcf_action_dump_1); |
1da177e4 LT |
451 | |
452 | int | |
453 | tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref) | |
454 | { | |
455 | struct tc_action *a; | |
456 | int err = -EINVAL; | |
4b3550ef | 457 | struct nlattr *nest; |
1da177e4 LT |
458 | |
459 | while ((a = act) != NULL) { | |
1da177e4 | 460 | act = a->next; |
4b3550ef PM |
461 | nest = nla_nest_start(skb, a->order); |
462 | if (nest == NULL) | |
463 | goto nla_put_failure; | |
1da177e4 LT |
464 | err = tcf_action_dump_1(skb, a, bind, ref); |
465 | if (err < 0) | |
4fe683f5 | 466 | goto errout; |
4b3550ef | 467 | nla_nest_end(skb, nest); |
1da177e4 LT |
468 | } |
469 | ||
470 | return 0; | |
471 | ||
7ba699c6 | 472 | nla_put_failure: |
4fe683f5 TG |
473 | err = -EINVAL; |
474 | errout: | |
4b3550ef | 475 | nla_nest_cancel(skb, nest); |
4fe683f5 | 476 | return err; |
1da177e4 LT |
477 | } |
478 | ||
7ba699c6 | 479 | struct tc_action *tcf_action_init_1(struct nlattr *nla, struct nlattr *est, |
ab27cfb8 | 480 | char *name, int ovr, int bind) |
1da177e4 LT |
481 | { |
482 | struct tc_action *a; | |
483 | struct tc_action_ops *a_o; | |
484 | char act_name[IFNAMSIZ]; | |
7ba699c6 PM |
485 | struct nlattr *tb[TCA_ACT_MAX+1]; |
486 | struct nlattr *kind; | |
ab27cfb8 | 487 | int err; |
1da177e4 | 488 | |
1da177e4 | 489 | if (name == NULL) { |
cee63723 PM |
490 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
491 | if (err < 0) | |
1da177e4 | 492 | goto err_out; |
cee63723 | 493 | err = -EINVAL; |
7ba699c6 | 494 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
495 | if (kind == NULL) |
496 | goto err_out; | |
7ba699c6 | 497 | if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) |
1da177e4 LT |
498 | goto err_out; |
499 | } else { | |
cee63723 | 500 | err = -EINVAL; |
1da177e4 LT |
501 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) |
502 | goto err_out; | |
503 | } | |
504 | ||
505 | a_o = tc_lookup_action_n(act_name); | |
506 | if (a_o == NULL) { | |
95a5afca | 507 | #ifdef CONFIG_MODULES |
1da177e4 | 508 | rtnl_unlock(); |
4bba3925 | 509 | request_module("act_%s", act_name); |
1da177e4 LT |
510 | rtnl_lock(); |
511 | ||
512 | a_o = tc_lookup_action_n(act_name); | |
513 | ||
514 | /* We dropped the RTNL semaphore in order to | |
515 | * perform the module load. So, even if we | |
516 | * succeeded in loading the module we have to | |
517 | * tell the caller to replay the request. We | |
518 | * indicate this using -EAGAIN. | |
519 | */ | |
520 | if (a_o != NULL) { | |
ab27cfb8 | 521 | err = -EAGAIN; |
1da177e4 LT |
522 | goto err_mod; |
523 | } | |
524 | #endif | |
ab27cfb8 | 525 | err = -ENOENT; |
1da177e4 LT |
526 | goto err_out; |
527 | } | |
528 | ||
ab27cfb8 | 529 | err = -ENOMEM; |
0da974f4 | 530 | a = kzalloc(sizeof(*a), GFP_KERNEL); |
1da177e4 LT |
531 | if (a == NULL) |
532 | goto err_mod; | |
1da177e4 LT |
533 | |
534 | /* backward compatibility for policer */ | |
535 | if (name == NULL) | |
ab27cfb8 | 536 | err = a_o->init(tb[TCA_ACT_OPTIONS], est, a, ovr, bind); |
1da177e4 | 537 | else |
ab27cfb8 PM |
538 | err = a_o->init(nla, est, a, ovr, bind); |
539 | if (err < 0) | |
1da177e4 LT |
540 | goto err_free; |
541 | ||
542 | /* module count goes up only when brand new policy is created | |
543 | if it exists and is only bound to in a_o->init() then | |
544 | ACT_P_CREATED is not returned (a zero is). | |
545 | */ | |
ab27cfb8 | 546 | if (err != ACT_P_CREATED) |
1da177e4 LT |
547 | module_put(a_o->owner); |
548 | a->ops = a_o; | |
1da177e4 | 549 | |
1da177e4 LT |
550 | return a; |
551 | ||
552 | err_free: | |
553 | kfree(a); | |
554 | err_mod: | |
555 | module_put(a_o->owner); | |
556 | err_out: | |
ab27cfb8 | 557 | return ERR_PTR(err); |
1da177e4 LT |
558 | } |
559 | ||
7ba699c6 | 560 | struct tc_action *tcf_action_init(struct nlattr *nla, struct nlattr *est, |
ab27cfb8 | 561 | char *name, int ovr, int bind) |
1da177e4 | 562 | { |
7ba699c6 | 563 | struct nlattr *tb[TCA_ACT_MAX_PRIO+1]; |
1da177e4 | 564 | struct tc_action *head = NULL, *act, *act_prev = NULL; |
cee63723 | 565 | int err; |
1da177e4 LT |
566 | int i; |
567 | ||
cee63723 PM |
568 | err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
569 | if (err < 0) | |
570 | return ERR_PTR(err); | |
1da177e4 | 571 | |
7ba699c6 | 572 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
ab27cfb8 PM |
573 | act = tcf_action_init_1(tb[i], est, name, ovr, bind); |
574 | if (IS_ERR(act)) | |
1da177e4 | 575 | goto err; |
7ba699c6 | 576 | act->order = i; |
1da177e4 LT |
577 | |
578 | if (head == NULL) | |
579 | head = act; | |
580 | else | |
581 | act_prev->next = act; | |
582 | act_prev = act; | |
583 | } | |
584 | return head; | |
585 | ||
586 | err: | |
587 | if (head != NULL) | |
588 | tcf_action_destroy(head, bind); | |
ab27cfb8 | 589 | return act; |
1da177e4 LT |
590 | } |
591 | ||
592 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a, | |
593 | int compat_mode) | |
594 | { | |
595 | int err = 0; | |
596 | struct gnet_dump d; | |
597 | struct tcf_act_hdr *h = a->priv; | |
10297b99 | 598 | |
1da177e4 LT |
599 | if (h == NULL) |
600 | goto errout; | |
601 | ||
602 | /* compat_mode being true specifies a call that is supposed | |
06fe9fb4 | 603 | * to add additional backward compatibility statistic TLVs. |
1da177e4 LT |
604 | */ |
605 | if (compat_mode) { | |
606 | if (a->type == TCA_OLD_COMPAT) | |
607 | err = gnet_stats_start_copy_compat(skb, 0, | |
4bdf3991 | 608 | TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d); |
1da177e4 LT |
609 | else |
610 | return 0; | |
611 | } else | |
612 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
4bdf3991 | 613 | &h->tcf_lock, &d); |
1da177e4 LT |
614 | |
615 | if (err < 0) | |
616 | goto errout; | |
617 | ||
618 | if (a->ops != NULL && a->ops->get_stats != NULL) | |
619 | if (a->ops->get_stats(skb, a) < 0) | |
620 | goto errout; | |
621 | ||
e9ce1cd3 | 622 | if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 || |
d250a5f9 ED |
623 | gnet_stats_copy_rate_est(&d, &h->tcf_bstats, |
624 | &h->tcf_rate_est) < 0 || | |
e9ce1cd3 | 625 | gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0) |
1da177e4 LT |
626 | goto errout; |
627 | ||
628 | if (gnet_stats_finish_copy(&d) < 0) | |
629 | goto errout; | |
630 | ||
631 | return 0; | |
632 | ||
633 | errout: | |
634 | return -1; | |
635 | } | |
636 | ||
637 | static int | |
638 | tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq, | |
10297b99 | 639 | u16 flags, int event, int bind, int ref) |
1da177e4 LT |
640 | { |
641 | struct tcamsg *t; | |
642 | struct nlmsghdr *nlh; | |
27a884dc | 643 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 644 | struct nlattr *nest; |
1da177e4 | 645 | |
e431b8c0 JHS |
646 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
647 | ||
1da177e4 LT |
648 | t = NLMSG_DATA(nlh); |
649 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
650 | t->tca__pad1 = 0; |
651 | t->tca__pad2 = 0; | |
10297b99 | 652 | |
4b3550ef PM |
653 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
654 | if (nest == NULL) | |
655 | goto nla_put_failure; | |
1da177e4 LT |
656 | |
657 | if (tcf_action_dump(skb, a, bind, ref) < 0) | |
7ba699c6 | 658 | goto nla_put_failure; |
1da177e4 | 659 | |
4b3550ef | 660 | nla_nest_end(skb, nest); |
10297b99 | 661 | |
27a884dc | 662 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
663 | return skb->len; |
664 | ||
7ba699c6 | 665 | nla_put_failure: |
1da177e4 | 666 | nlmsg_failure: |
dc5fc579 | 667 | nlmsg_trim(skb, b); |
1da177e4 LT |
668 | return -1; |
669 | } | |
670 | ||
671 | static int | |
7316ae88 TG |
672 | act_get_notify(struct net *net, u32 pid, struct nlmsghdr *n, |
673 | struct tc_action *a, int event) | |
1da177e4 LT |
674 | { |
675 | struct sk_buff *skb; | |
1da177e4 LT |
676 | |
677 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
678 | if (!skb) | |
679 | return -ENOBUFS; | |
680 | if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { | |
681 | kfree_skb(skb); | |
682 | return -EINVAL; | |
683 | } | |
2942e900 | 684 | |
7316ae88 | 685 | return rtnl_unicast(skb, net, pid); |
1da177e4 LT |
686 | } |
687 | ||
688 | static struct tc_action * | |
ab27cfb8 | 689 | tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid) |
1da177e4 | 690 | { |
7ba699c6 | 691 | struct nlattr *tb[TCA_ACT_MAX+1]; |
1da177e4 LT |
692 | struct tc_action *a; |
693 | int index; | |
ab27cfb8 | 694 | int err; |
1da177e4 | 695 | |
cee63723 PM |
696 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
697 | if (err < 0) | |
ab27cfb8 | 698 | goto err_out; |
1da177e4 | 699 | |
cee63723 | 700 | err = -EINVAL; |
7ba699c6 PM |
701 | if (tb[TCA_ACT_INDEX] == NULL || |
702 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) | |
ab27cfb8 | 703 | goto err_out; |
1587bac4 | 704 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 705 | |
ab27cfb8 | 706 | err = -ENOMEM; |
0da974f4 | 707 | a = kzalloc(sizeof(struct tc_action), GFP_KERNEL); |
1da177e4 | 708 | if (a == NULL) |
ab27cfb8 | 709 | goto err_out; |
1da177e4 | 710 | |
ab27cfb8 | 711 | err = -EINVAL; |
7ba699c6 | 712 | a->ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
1da177e4 LT |
713 | if (a->ops == NULL) |
714 | goto err_free; | |
715 | if (a->ops->lookup == NULL) | |
716 | goto err_mod; | |
ab27cfb8 | 717 | err = -ENOENT; |
1da177e4 LT |
718 | if (a->ops->lookup(a, index) == 0) |
719 | goto err_mod; | |
720 | ||
721 | module_put(a->ops->owner); | |
1da177e4 | 722 | return a; |
ab27cfb8 | 723 | |
1da177e4 LT |
724 | err_mod: |
725 | module_put(a->ops->owner); | |
726 | err_free: | |
727 | kfree(a); | |
ab27cfb8 PM |
728 | err_out: |
729 | return ERR_PTR(err); | |
1da177e4 LT |
730 | } |
731 | ||
732 | static void cleanup_a(struct tc_action *act) | |
733 | { | |
734 | struct tc_action *a; | |
735 | ||
736 | for (a = act; a; a = act) { | |
737 | act = a->next; | |
738 | kfree(a); | |
739 | } | |
740 | } | |
741 | ||
742 | static struct tc_action *create_a(int i) | |
743 | { | |
744 | struct tc_action *act; | |
745 | ||
0da974f4 | 746 | act = kzalloc(sizeof(*act), GFP_KERNEL); |
1da177e4 | 747 | if (act == NULL) { |
6ff9c364 | 748 | pr_debug("create_a: failed to alloc!\n"); |
1da177e4 LT |
749 | return NULL; |
750 | } | |
1da177e4 LT |
751 | act->order = i; |
752 | return act; | |
753 | } | |
754 | ||
7316ae88 TG |
755 | static int tca_action_flush(struct net *net, struct nlattr *nla, |
756 | struct nlmsghdr *n, u32 pid) | |
1da177e4 LT |
757 | { |
758 | struct sk_buff *skb; | |
759 | unsigned char *b; | |
760 | struct nlmsghdr *nlh; | |
761 | struct tcamsg *t; | |
762 | struct netlink_callback dcb; | |
4b3550ef | 763 | struct nlattr *nest; |
7ba699c6 PM |
764 | struct nlattr *tb[TCA_ACT_MAX+1]; |
765 | struct nlattr *kind; | |
1da177e4 | 766 | struct tc_action *a = create_a(0); |
36723873 | 767 | int err = -ENOMEM; |
1da177e4 LT |
768 | |
769 | if (a == NULL) { | |
6ff9c364 | 770 | pr_debug("tca_action_flush: couldnt create tc_action\n"); |
1da177e4 LT |
771 | return err; |
772 | } | |
773 | ||
774 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
775 | if (!skb) { | |
6ff9c364 | 776 | pr_debug("tca_action_flush: failed skb alloc\n"); |
1da177e4 | 777 | kfree(a); |
36723873 | 778 | return err; |
1da177e4 LT |
779 | } |
780 | ||
27a884dc | 781 | b = skb_tail_pointer(skb); |
1da177e4 | 782 | |
cee63723 PM |
783 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
784 | if (err < 0) | |
1da177e4 LT |
785 | goto err_out; |
786 | ||
cee63723 | 787 | err = -EINVAL; |
7ba699c6 | 788 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
789 | a->ops = tc_lookup_action(kind); |
790 | if (a->ops == NULL) | |
791 | goto err_out; | |
792 | ||
793 | nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t)); | |
794 | t = NLMSG_DATA(nlh); | |
795 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
796 | t->tca__pad1 = 0; |
797 | t->tca__pad2 = 0; | |
1da177e4 | 798 | |
4b3550ef PM |
799 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
800 | if (nest == NULL) | |
801 | goto nla_put_failure; | |
1da177e4 LT |
802 | |
803 | err = a->ops->walk(skb, &dcb, RTM_DELACTION, a); | |
804 | if (err < 0) | |
7ba699c6 | 805 | goto nla_put_failure; |
f97017cd JHS |
806 | if (err == 0) |
807 | goto noflush_out; | |
1da177e4 | 808 | |
4b3550ef | 809 | nla_nest_end(skb, nest); |
1da177e4 | 810 | |
27a884dc | 811 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
812 | nlh->nlmsg_flags |= NLM_F_ROOT; |
813 | module_put(a->ops->owner); | |
814 | kfree(a); | |
7316ae88 | 815 | err = rtnetlink_send(skb, net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
816 | if (err > 0) |
817 | return 0; | |
818 | ||
819 | return err; | |
820 | ||
7ba699c6 | 821 | nla_put_failure: |
1da177e4 | 822 | nlmsg_failure: |
ebbaeab1 | 823 | module_put(a->ops->owner); |
1da177e4 | 824 | err_out: |
f97017cd | 825 | noflush_out: |
1da177e4 LT |
826 | kfree_skb(skb); |
827 | kfree(a); | |
828 | return err; | |
829 | } | |
830 | ||
831 | static int | |
7316ae88 TG |
832 | tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
833 | u32 pid, int event) | |
1da177e4 | 834 | { |
cee63723 | 835 | int i, ret; |
7ba699c6 | 836 | struct nlattr *tb[TCA_ACT_MAX_PRIO+1]; |
1da177e4 LT |
837 | struct tc_action *head = NULL, *act, *act_prev = NULL; |
838 | ||
cee63723 PM |
839 | ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
840 | if (ret < 0) | |
841 | return ret; | |
1da177e4 LT |
842 | |
843 | if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) { | |
f97017cd | 844 | if (tb[1] != NULL) |
7316ae88 | 845 | return tca_action_flush(net, tb[1], n, pid); |
f97017cd JHS |
846 | else |
847 | return -EINVAL; | |
1da177e4 LT |
848 | } |
849 | ||
7ba699c6 | 850 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
ab27cfb8 PM |
851 | act = tcf_action_get_1(tb[i], n, pid); |
852 | if (IS_ERR(act)) { | |
853 | ret = PTR_ERR(act); | |
1da177e4 | 854 | goto err; |
ab27cfb8 | 855 | } |
7ba699c6 | 856 | act->order = i; |
1da177e4 LT |
857 | |
858 | if (head == NULL) | |
859 | head = act; | |
860 | else | |
861 | act_prev->next = act; | |
862 | act_prev = act; | |
863 | } | |
864 | ||
865 | if (event == RTM_GETACTION) | |
7316ae88 | 866 | ret = act_get_notify(net, pid, n, head, event); |
1da177e4 LT |
867 | else { /* delete */ |
868 | struct sk_buff *skb; | |
869 | ||
870 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
871 | if (!skb) { | |
872 | ret = -ENOBUFS; | |
873 | goto err; | |
874 | } | |
875 | ||
876 | if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event, | |
10297b99 | 877 | 0, 1) <= 0) { |
1da177e4 LT |
878 | kfree_skb(skb); |
879 | ret = -EINVAL; | |
880 | goto err; | |
881 | } | |
882 | ||
883 | /* now do the delete */ | |
884 | tcf_action_destroy(head, 0); | |
7316ae88 | 885 | ret = rtnetlink_send(skb, net, pid, RTNLGRP_TC, |
10297b99 | 886 | n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
887 | if (ret > 0) |
888 | return 0; | |
889 | return ret; | |
890 | } | |
891 | err: | |
892 | cleanup_a(head); | |
893 | return ret; | |
894 | } | |
895 | ||
7316ae88 TG |
896 | static int tcf_add_notify(struct net *net, struct tc_action *a, |
897 | u32 pid, u32 seq, int event, u16 flags) | |
1da177e4 LT |
898 | { |
899 | struct tcamsg *t; | |
900 | struct nlmsghdr *nlh; | |
901 | struct sk_buff *skb; | |
4b3550ef | 902 | struct nlattr *nest; |
1da177e4 LT |
903 | unsigned char *b; |
904 | int err = 0; | |
905 | ||
906 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
907 | if (!skb) | |
908 | return -ENOBUFS; | |
909 | ||
27a884dc | 910 | b = skb_tail_pointer(skb); |
1da177e4 | 911 | |
e431b8c0 | 912 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
1da177e4 LT |
913 | t = NLMSG_DATA(nlh); |
914 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
915 | t->tca__pad1 = 0; |
916 | t->tca__pad2 = 0; | |
917 | ||
4b3550ef PM |
918 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
919 | if (nest == NULL) | |
920 | goto nla_put_failure; | |
1da177e4 LT |
921 | |
922 | if (tcf_action_dump(skb, a, 0, 0) < 0) | |
7ba699c6 | 923 | goto nla_put_failure; |
1da177e4 | 924 | |
4b3550ef | 925 | nla_nest_end(skb, nest); |
10297b99 | 926 | |
27a884dc | 927 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
ac6d439d | 928 | NETLINK_CB(skb).dst_group = RTNLGRP_TC; |
10297b99 | 929 | |
7316ae88 | 930 | err = rtnetlink_send(skb, net, pid, RTNLGRP_TC, flags&NLM_F_ECHO); |
1da177e4 LT |
931 | if (err > 0) |
932 | err = 0; | |
933 | return err; | |
934 | ||
7ba699c6 | 935 | nla_put_failure: |
1da177e4 | 936 | nlmsg_failure: |
f6e57464 | 937 | kfree_skb(skb); |
1da177e4 LT |
938 | return -1; |
939 | } | |
940 | ||
10297b99 | 941 | |
1da177e4 | 942 | static int |
7316ae88 TG |
943 | tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
944 | u32 pid, int ovr) | |
1da177e4 LT |
945 | { |
946 | int ret = 0; | |
947 | struct tc_action *act; | |
948 | struct tc_action *a; | |
949 | u32 seq = n->nlmsg_seq; | |
950 | ||
ab27cfb8 | 951 | act = tcf_action_init(nla, NULL, NULL, ovr, 0); |
1da177e4 LT |
952 | if (act == NULL) |
953 | goto done; | |
ab27cfb8 PM |
954 | if (IS_ERR(act)) { |
955 | ret = PTR_ERR(act); | |
956 | goto done; | |
957 | } | |
1da177e4 LT |
958 | |
959 | /* dump then free all the actions after update; inserted policy | |
960 | * stays intact | |
961 | * */ | |
7316ae88 | 962 | ret = tcf_add_notify(net, act, pid, seq, RTM_NEWACTION, n->nlmsg_flags); |
1da177e4 LT |
963 | for (a = act; a; a = act) { |
964 | act = a->next; | |
965 | kfree(a); | |
966 | } | |
967 | done: | |
968 | return ret; | |
969 | } | |
970 | ||
971 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
972 | { | |
3b1e0a65 | 973 | struct net *net = sock_net(skb->sk); |
7ba699c6 | 974 | struct nlattr *tca[TCA_ACT_MAX + 1]; |
1da177e4 LT |
975 | u32 pid = skb ? NETLINK_CB(skb).pid : 0; |
976 | int ret = 0, ovr = 0; | |
977 | ||
7ba699c6 PM |
978 | ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL); |
979 | if (ret < 0) | |
980 | return ret; | |
981 | ||
982 | if (tca[TCA_ACT_TAB] == NULL) { | |
6ff9c364 | 983 | pr_notice("tc_ctl_action: received NO action attribs\n"); |
1da177e4 LT |
984 | return -EINVAL; |
985 | } | |
986 | ||
987 | /* n->nlmsg_flags&NLM_F_CREATE | |
988 | * */ | |
989 | switch (n->nlmsg_type) { | |
990 | case RTM_NEWACTION: | |
991 | /* we are going to assume all other flags | |
992 | * imply create only if it doesnt exist | |
993 | * Note that CREATE | EXCL implies that | |
994 | * but since we want avoid ambiguity (eg when flags | |
995 | * is zero) then just set this | |
996 | */ | |
997 | if (n->nlmsg_flags&NLM_F_REPLACE) | |
998 | ovr = 1; | |
999 | replay: | |
7316ae88 | 1000 | ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, pid, ovr); |
1da177e4 LT |
1001 | if (ret == -EAGAIN) |
1002 | goto replay; | |
1003 | break; | |
1004 | case RTM_DELACTION: | |
7316ae88 TG |
1005 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
1006 | pid, RTM_DELACTION); | |
1da177e4 LT |
1007 | break; |
1008 | case RTM_GETACTION: | |
7316ae88 TG |
1009 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
1010 | pid, RTM_GETACTION); | |
1da177e4 LT |
1011 | break; |
1012 | default: | |
1013 | BUG(); | |
1014 | } | |
1015 | ||
1016 | return ret; | |
1017 | } | |
1018 | ||
7ba699c6 | 1019 | static struct nlattr * |
3a6c2b41 | 1020 | find_dump_kind(const struct nlmsghdr *n) |
1da177e4 | 1021 | { |
7ba699c6 PM |
1022 | struct nlattr *tb1, *tb2[TCA_ACT_MAX+1]; |
1023 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; | |
1024 | struct nlattr *nla[TCAA_MAX + 1]; | |
1025 | struct nlattr *kind; | |
1da177e4 | 1026 | |
c96c9471 | 1027 | if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0) |
1da177e4 | 1028 | return NULL; |
7ba699c6 | 1029 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
1030 | if (tb1 == NULL) |
1031 | return NULL; | |
1032 | ||
7ba699c6 PM |
1033 | if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), |
1034 | NLMSG_ALIGN(nla_len(tb1)), NULL) < 0) | |
1da177e4 | 1035 | return NULL; |
1da177e4 | 1036 | |
6d834e04 PM |
1037 | if (tb[1] == NULL) |
1038 | return NULL; | |
1039 | if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]), | |
1040 | nla_len(tb[1]), NULL) < 0) | |
1da177e4 | 1041 | return NULL; |
7ba699c6 | 1042 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 1043 | |
26dab893 | 1044 | return kind; |
1da177e4 LT |
1045 | } |
1046 | ||
1047 | static int | |
1048 | tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) | |
1049 | { | |
1050 | struct nlmsghdr *nlh; | |
27a884dc | 1051 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1052 | struct nlattr *nest; |
1da177e4 LT |
1053 | struct tc_action_ops *a_o; |
1054 | struct tc_action a; | |
1055 | int ret = 0; | |
1056 | struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh); | |
7ba699c6 | 1057 | struct nlattr *kind = find_dump_kind(cb->nlh); |
1da177e4 LT |
1058 | |
1059 | if (kind == NULL) { | |
6ff9c364 | 1060 | pr_info("tc_dump_action: action bad kind\n"); |
1da177e4 LT |
1061 | return 0; |
1062 | } | |
1063 | ||
26dab893 | 1064 | a_o = tc_lookup_action(kind); |
1da177e4 | 1065 | if (a_o == NULL) { |
1da177e4 LT |
1066 | return 0; |
1067 | } | |
1068 | ||
1069 | memset(&a, 0, sizeof(struct tc_action)); | |
1070 | a.ops = a_o; | |
1071 | ||
1072 | if (a_o->walk == NULL) { | |
6ff9c364 | 1073 | WARN(1, "tc_dump_action: %s !capable of dumping table\n", |
1074 | a_o->kind); | |
7ba699c6 | 1075 | goto nla_put_failure; |
1da177e4 LT |
1076 | } |
1077 | ||
1078 | nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, | |
10297b99 | 1079 | cb->nlh->nlmsg_type, sizeof(*t)); |
1da177e4 LT |
1080 | t = NLMSG_DATA(nlh); |
1081 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
1082 | t->tca__pad1 = 0; |
1083 | t->tca__pad2 = 0; | |
1da177e4 | 1084 | |
4b3550ef PM |
1085 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
1086 | if (nest == NULL) | |
1087 | goto nla_put_failure; | |
1da177e4 LT |
1088 | |
1089 | ret = a_o->walk(skb, cb, RTM_GETACTION, &a); | |
1090 | if (ret < 0) | |
7ba699c6 | 1091 | goto nla_put_failure; |
1da177e4 LT |
1092 | |
1093 | if (ret > 0) { | |
4b3550ef | 1094 | nla_nest_end(skb, nest); |
1da177e4 LT |
1095 | ret = skb->len; |
1096 | } else | |
4b3550ef | 1097 | nla_nest_cancel(skb, nest); |
1da177e4 | 1098 | |
27a884dc | 1099 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1100 | if (NETLINK_CB(cb->skb).pid && ret) |
1101 | nlh->nlmsg_flags |= NLM_F_MULTI; | |
1102 | module_put(a_o->owner); | |
1103 | return skb->len; | |
1104 | ||
7ba699c6 | 1105 | nla_put_failure: |
1da177e4 LT |
1106 | nlmsg_failure: |
1107 | module_put(a_o->owner); | |
dc5fc579 | 1108 | nlmsg_trim(skb, b); |
1da177e4 LT |
1109 | return skb->len; |
1110 | } | |
1111 | ||
1112 | static int __init tc_action_init(void) | |
1113 | { | |
708914cc TG |
1114 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL); |
1115 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL); | |
1116 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action); | |
1da177e4 | 1117 | |
1da177e4 LT |
1118 | return 0; |
1119 | } | |
1120 | ||
1121 | subsys_initcall(tc_action_init); |