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> |
1da177e4 | 18 | #include <linux/skbuff.h> |
1da177e4 LT |
19 | #include <linux/init.h> |
20 | #include <linux/kmod.h> | |
ab27cfb8 | 21 | #include <linux/err.h> |
b854272b DL |
22 | #include <net/net_namespace.h> |
23 | #include <net/sock.h> | |
1da177e4 LT |
24 | #include <net/sch_generic.h> |
25 | #include <net/act_api.h> | |
dc5fc579 | 26 | #include <net/netlink.h> |
1da177e4 | 27 | |
e9ce1cd3 DM |
28 | void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo) |
29 | { | |
30 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); | |
31 | struct tcf_common **p1p; | |
32 | ||
33 | for (p1p = &hinfo->htab[h]; *p1p; p1p = &(*p1p)->tcfc_next) { | |
34 | if (*p1p == p) { | |
35 | write_lock_bh(hinfo->lock); | |
36 | *p1p = p->tcfc_next; | |
37 | write_unlock_bh(hinfo->lock); | |
e9ce1cd3 DM |
38 | gen_kill_estimator(&p->tcfc_bstats, |
39 | &p->tcfc_rate_est); | |
e9ce1cd3 DM |
40 | kfree(p); |
41 | return; | |
42 | } | |
43 | } | |
547b792c | 44 | WARN_ON(1); |
e9ce1cd3 DM |
45 | } |
46 | EXPORT_SYMBOL(tcf_hash_destroy); | |
47 | ||
48 | int tcf_hash_release(struct tcf_common *p, int bind, | |
49 | struct tcf_hashinfo *hinfo) | |
50 | { | |
51 | int ret = 0; | |
52 | ||
53 | if (p) { | |
54 | if (bind) | |
55 | p->tcfc_bindcnt--; | |
56 | ||
57 | p->tcfc_refcnt--; | |
10297b99 | 58 | if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) { |
e9ce1cd3 DM |
59 | tcf_hash_destroy(p, hinfo); |
60 | ret = 1; | |
61 | } | |
62 | } | |
63 | return ret; | |
64 | } | |
65 | EXPORT_SYMBOL(tcf_hash_release); | |
66 | ||
67 | static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
68 | struct tc_action *a, struct tcf_hashinfo *hinfo) | |
69 | { | |
70 | struct tcf_common *p; | |
71 | int err = 0, index = -1,i = 0, s_i = 0, n_i = 0; | |
4b3550ef | 72 | struct nlattr *nest; |
e9ce1cd3 | 73 | |
e1e992e5 | 74 | read_lock_bh(hinfo->lock); |
e9ce1cd3 DM |
75 | |
76 | s_i = cb->args[0]; | |
77 | ||
78 | for (i = 0; i < (hinfo->hmask + 1); i++) { | |
79 | p = hinfo->htab[tcf_hash(i, hinfo->hmask)]; | |
80 | ||
81 | for (; p; p = p->tcfc_next) { | |
82 | index++; | |
83 | if (index < s_i) | |
84 | continue; | |
85 | a->priv = p; | |
86 | a->order = n_i; | |
4b3550ef PM |
87 | |
88 | nest = nla_nest_start(skb, a->order); | |
89 | if (nest == NULL) | |
90 | goto nla_put_failure; | |
e9ce1cd3 DM |
91 | err = tcf_action_dump_1(skb, a, 0, 0); |
92 | if (err < 0) { | |
93 | index--; | |
4b3550ef | 94 | nlmsg_trim(skb, nest); |
e9ce1cd3 DM |
95 | goto done; |
96 | } | |
4b3550ef | 97 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
98 | n_i++; |
99 | if (n_i >= TCA_ACT_MAX_PRIO) | |
100 | goto done; | |
101 | } | |
102 | } | |
103 | done: | |
e1e992e5 | 104 | read_unlock_bh(hinfo->lock); |
e9ce1cd3 DM |
105 | if (n_i) |
106 | cb->args[0] += n_i; | |
107 | return n_i; | |
108 | ||
7ba699c6 | 109 | nla_put_failure: |
4b3550ef | 110 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
111 | goto done; |
112 | } | |
113 | ||
114 | static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a, | |
115 | struct tcf_hashinfo *hinfo) | |
116 | { | |
117 | struct tcf_common *p, *s_p; | |
4b3550ef | 118 | struct nlattr *nest; |
e9ce1cd3 DM |
119 | int i= 0, n_i = 0; |
120 | ||
4b3550ef PM |
121 | nest = nla_nest_start(skb, a->order); |
122 | if (nest == NULL) | |
123 | goto nla_put_failure; | |
57e1c487 | 124 | NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind); |
e9ce1cd3 DM |
125 | for (i = 0; i < (hinfo->hmask + 1); i++) { |
126 | p = hinfo->htab[tcf_hash(i, hinfo->hmask)]; | |
127 | ||
128 | while (p != NULL) { | |
129 | s_p = p->tcfc_next; | |
130 | if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo)) | |
131 | module_put(a->ops->owner); | |
132 | n_i++; | |
133 | p = s_p; | |
134 | } | |
135 | } | |
24beeab5 | 136 | NLA_PUT_U32(skb, TCA_FCNT, n_i); |
4b3550ef | 137 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
138 | |
139 | return n_i; | |
7ba699c6 | 140 | nla_put_failure: |
4b3550ef | 141 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
142 | return -EINVAL; |
143 | } | |
144 | ||
145 | int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
146 | int type, struct tc_action *a) | |
147 | { | |
148 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
149 | ||
150 | if (type == RTM_DELACTION) { | |
151 | return tcf_del_walker(skb, a, hinfo); | |
152 | } else if (type == RTM_GETACTION) { | |
153 | return tcf_dump_walker(skb, cb, a, hinfo); | |
154 | } else { | |
155 | printk("tcf_generic_walker: unknown action %d\n", type); | |
156 | return -EINVAL; | |
157 | } | |
158 | } | |
159 | EXPORT_SYMBOL(tcf_generic_walker); | |
160 | ||
161 | struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo) | |
162 | { | |
163 | struct tcf_common *p; | |
164 | ||
e1e992e5 | 165 | read_lock_bh(hinfo->lock); |
e9ce1cd3 DM |
166 | for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p; |
167 | p = p->tcfc_next) { | |
168 | if (p->tcfc_index == index) | |
169 | break; | |
170 | } | |
e1e992e5 | 171 | read_unlock_bh(hinfo->lock); |
e9ce1cd3 DM |
172 | |
173 | return p; | |
174 | } | |
175 | EXPORT_SYMBOL(tcf_hash_lookup); | |
176 | ||
177 | u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo) | |
178 | { | |
179 | u32 val = *idx_gen; | |
180 | ||
181 | do { | |
182 | if (++val == 0) | |
183 | val = 1; | |
184 | } while (tcf_hash_lookup(val, hinfo)); | |
185 | ||
186 | return (*idx_gen = val); | |
187 | } | |
188 | EXPORT_SYMBOL(tcf_hash_new_index); | |
189 | ||
190 | int tcf_hash_search(struct tc_action *a, u32 index) | |
191 | { | |
192 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
193 | struct tcf_common *p = tcf_hash_lookup(index, hinfo); | |
194 | ||
195 | if (p) { | |
196 | a->priv = p; | |
197 | return 1; | |
198 | } | |
199 | return 0; | |
200 | } | |
201 | EXPORT_SYMBOL(tcf_hash_search); | |
202 | ||
203 | struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind, | |
204 | struct tcf_hashinfo *hinfo) | |
205 | { | |
206 | struct tcf_common *p = NULL; | |
207 | if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) { | |
76aab2c1 | 208 | if (bind) |
e9ce1cd3 | 209 | p->tcfc_bindcnt++; |
76aab2c1 | 210 | p->tcfc_refcnt++; |
e9ce1cd3 DM |
211 | a->priv = p; |
212 | } | |
213 | return p; | |
214 | } | |
215 | EXPORT_SYMBOL(tcf_hash_check); | |
216 | ||
7ba699c6 | 217 | struct tcf_common *tcf_hash_create(u32 index, struct nlattr *est, struct tc_action *a, int size, int bind, u32 *idx_gen, struct tcf_hashinfo *hinfo) |
e9ce1cd3 DM |
218 | { |
219 | struct tcf_common *p = kzalloc(size, GFP_KERNEL); | |
220 | ||
221 | if (unlikely(!p)) | |
222 | return p; | |
223 | p->tcfc_refcnt = 1; | |
224 | if (bind) | |
225 | p->tcfc_bindcnt = 1; | |
226 | ||
227 | spin_lock_init(&p->tcfc_lock); | |
e9ce1cd3 DM |
228 | p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo); |
229 | p->tcfc_tm.install = jiffies; | |
230 | p->tcfc_tm.lastuse = jiffies; | |
e9ce1cd3 DM |
231 | if (est) |
232 | gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est, | |
7ba699c6 | 233 | &p->tcfc_lock, est); |
e9ce1cd3 DM |
234 | a->priv = (void *) p; |
235 | return p; | |
236 | } | |
237 | EXPORT_SYMBOL(tcf_hash_create); | |
238 | ||
239 | void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo) | |
240 | { | |
241 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); | |
242 | ||
243 | write_lock_bh(hinfo->lock); | |
244 | p->tcfc_next = hinfo->htab[h]; | |
245 | hinfo->htab[h] = p; | |
246 | write_unlock_bh(hinfo->lock); | |
247 | } | |
248 | EXPORT_SYMBOL(tcf_hash_insert); | |
1da177e4 LT |
249 | |
250 | static struct tc_action_ops *act_base = NULL; | |
251 | static DEFINE_RWLOCK(act_mod_lock); | |
252 | ||
253 | int tcf_register_action(struct tc_action_ops *act) | |
254 | { | |
255 | struct tc_action_ops *a, **ap; | |
256 | ||
257 | write_lock(&act_mod_lock); | |
258 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) { | |
259 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { | |
260 | write_unlock(&act_mod_lock); | |
261 | return -EEXIST; | |
262 | } | |
263 | } | |
264 | act->next = NULL; | |
265 | *ap = act; | |
266 | write_unlock(&act_mod_lock); | |
267 | return 0; | |
268 | } | |
62e3ba1b | 269 | EXPORT_SYMBOL(tcf_register_action); |
1da177e4 LT |
270 | |
271 | int tcf_unregister_action(struct tc_action_ops *act) | |
272 | { | |
273 | struct tc_action_ops *a, **ap; | |
274 | int err = -ENOENT; | |
275 | ||
276 | write_lock(&act_mod_lock); | |
277 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) | |
278 | if (a == act) | |
279 | break; | |
280 | if (a) { | |
281 | *ap = a->next; | |
282 | a->next = NULL; | |
283 | err = 0; | |
284 | } | |
285 | write_unlock(&act_mod_lock); | |
286 | return err; | |
287 | } | |
62e3ba1b | 288 | EXPORT_SYMBOL(tcf_unregister_action); |
1da177e4 LT |
289 | |
290 | /* lookup by name */ | |
291 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
292 | { | |
293 | struct tc_action_ops *a = NULL; | |
294 | ||
295 | if (kind) { | |
296 | read_lock(&act_mod_lock); | |
297 | for (a = act_base; a; a = a->next) { | |
298 | if (strcmp(kind, a->kind) == 0) { | |
299 | if (!try_module_get(a->owner)) { | |
300 | read_unlock(&act_mod_lock); | |
301 | return NULL; | |
302 | } | |
303 | break; | |
304 | } | |
305 | } | |
306 | read_unlock(&act_mod_lock); | |
307 | } | |
308 | return a; | |
309 | } | |
310 | ||
7ba699c6 PM |
311 | /* lookup by nlattr */ |
312 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) | |
1da177e4 LT |
313 | { |
314 | struct tc_action_ops *a = NULL; | |
315 | ||
316 | if (kind) { | |
317 | read_lock(&act_mod_lock); | |
318 | for (a = act_base; a; a = a->next) { | |
7ba699c6 | 319 | if (nla_strcmp(kind, a->kind) == 0) { |
1da177e4 LT |
320 | if (!try_module_get(a->owner)) { |
321 | read_unlock(&act_mod_lock); | |
322 | return NULL; | |
323 | } | |
324 | break; | |
325 | } | |
326 | } | |
327 | read_unlock(&act_mod_lock); | |
328 | } | |
329 | return a; | |
330 | } | |
331 | ||
332 | #if 0 | |
333 | /* lookup by id */ | |
334 | static struct tc_action_ops *tc_lookup_action_id(u32 type) | |
335 | { | |
336 | struct tc_action_ops *a = NULL; | |
337 | ||
338 | if (type) { | |
339 | read_lock(&act_mod_lock); | |
340 | for (a = act_base; a; a = a->next) { | |
341 | if (a->type == type) { | |
342 | if (!try_module_get(a->owner)) { | |
343 | read_unlock(&act_mod_lock); | |
344 | return NULL; | |
345 | } | |
346 | break; | |
347 | } | |
348 | } | |
349 | read_unlock(&act_mod_lock); | |
350 | } | |
351 | return a; | |
352 | } | |
353 | #endif | |
354 | ||
355 | int tcf_action_exec(struct sk_buff *skb, struct tc_action *act, | |
10297b99 | 356 | struct tcf_result *res) |
1da177e4 LT |
357 | { |
358 | struct tc_action *a; | |
359 | int ret = -1; | |
360 | ||
361 | if (skb->tc_verd & TC_NCLS) { | |
362 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
1da177e4 LT |
363 | ret = TC_ACT_OK; |
364 | goto exec_done; | |
365 | } | |
366 | while ((a = act) != NULL) { | |
367 | repeat: | |
368 | if (a->ops && a->ops->act) { | |
f43c5a0d | 369 | ret = a->ops->act(skb, a, res); |
1da177e4 LT |
370 | if (TC_MUNGED & skb->tc_verd) { |
371 | /* copied already, allow trampling */ | |
372 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); | |
373 | skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd); | |
374 | } | |
1da177e4 LT |
375 | if (ret == TC_ACT_REPEAT) |
376 | goto repeat; /* we need a ttl - JHS */ | |
14d50e78 HS |
377 | if (ret != TC_ACT_PIPE) |
378 | goto exec_done; | |
1da177e4 LT |
379 | } |
380 | act = a->next; | |
381 | } | |
382 | exec_done: | |
1da177e4 LT |
383 | return ret; |
384 | } | |
62e3ba1b | 385 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 LT |
386 | |
387 | void tcf_action_destroy(struct tc_action *act, int bind) | |
388 | { | |
389 | struct tc_action *a; | |
390 | ||
391 | for (a = act; a; a = act) { | |
392 | if (a->ops && a->ops->cleanup) { | |
1da177e4 LT |
393 | if (a->ops->cleanup(a, bind) == ACT_P_DELETED) |
394 | module_put(a->ops->owner); | |
395 | act = act->next; | |
396 | kfree(a); | |
397 | } else { /*FIXME: Remove later - catch insertion bugs*/ | |
398 | printk("tcf_action_destroy: BUG? destroying NULL ops\n"); | |
399 | act = act->next; | |
400 | kfree(a); | |
401 | } | |
402 | } | |
403 | } | |
404 | ||
405 | int | |
406 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
407 | { | |
408 | int err = -EINVAL; | |
409 | ||
410 | if (a->ops == NULL || a->ops->dump == NULL) | |
411 | return err; | |
412 | return a->ops->dump(skb, a, bind, ref); | |
413 | } | |
414 | ||
415 | int | |
416 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
417 | { | |
418 | int err = -EINVAL; | |
27a884dc | 419 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 420 | struct nlattr *nest; |
1da177e4 LT |
421 | |
422 | if (a->ops == NULL || a->ops->dump == NULL) | |
423 | return err; | |
424 | ||
57e1c487 | 425 | NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind); |
1da177e4 | 426 | if (tcf_action_copy_stats(skb, a, 0)) |
7ba699c6 | 427 | goto nla_put_failure; |
4b3550ef PM |
428 | nest = nla_nest_start(skb, TCA_OPTIONS); |
429 | if (nest == NULL) | |
430 | goto nla_put_failure; | |
1da177e4 | 431 | if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) { |
4b3550ef | 432 | nla_nest_end(skb, nest); |
1da177e4 LT |
433 | return err; |
434 | } | |
435 | ||
7ba699c6 | 436 | nla_put_failure: |
dc5fc579 | 437 | nlmsg_trim(skb, b); |
1da177e4 LT |
438 | return -1; |
439 | } | |
62e3ba1b | 440 | EXPORT_SYMBOL(tcf_action_dump_1); |
1da177e4 LT |
441 | |
442 | int | |
443 | tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref) | |
444 | { | |
445 | struct tc_action *a; | |
446 | int err = -EINVAL; | |
4b3550ef | 447 | struct nlattr *nest; |
1da177e4 LT |
448 | |
449 | while ((a = act) != NULL) { | |
1da177e4 | 450 | act = a->next; |
4b3550ef PM |
451 | nest = nla_nest_start(skb, a->order); |
452 | if (nest == NULL) | |
453 | goto nla_put_failure; | |
1da177e4 LT |
454 | err = tcf_action_dump_1(skb, a, bind, ref); |
455 | if (err < 0) | |
4fe683f5 | 456 | goto errout; |
4b3550ef | 457 | nla_nest_end(skb, nest); |
1da177e4 LT |
458 | } |
459 | ||
460 | return 0; | |
461 | ||
7ba699c6 | 462 | nla_put_failure: |
4fe683f5 TG |
463 | err = -EINVAL; |
464 | errout: | |
4b3550ef | 465 | nla_nest_cancel(skb, nest); |
4fe683f5 | 466 | return err; |
1da177e4 LT |
467 | } |
468 | ||
7ba699c6 | 469 | struct tc_action *tcf_action_init_1(struct nlattr *nla, struct nlattr *est, |
ab27cfb8 | 470 | char *name, int ovr, int bind) |
1da177e4 LT |
471 | { |
472 | struct tc_action *a; | |
473 | struct tc_action_ops *a_o; | |
474 | char act_name[IFNAMSIZ]; | |
7ba699c6 PM |
475 | struct nlattr *tb[TCA_ACT_MAX+1]; |
476 | struct nlattr *kind; | |
ab27cfb8 | 477 | int err; |
1da177e4 | 478 | |
1da177e4 | 479 | if (name == NULL) { |
cee63723 PM |
480 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
481 | if (err < 0) | |
1da177e4 | 482 | goto err_out; |
cee63723 | 483 | err = -EINVAL; |
7ba699c6 | 484 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
485 | if (kind == NULL) |
486 | goto err_out; | |
7ba699c6 | 487 | if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) |
1da177e4 LT |
488 | goto err_out; |
489 | } else { | |
cee63723 | 490 | err = -EINVAL; |
1da177e4 LT |
491 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) |
492 | goto err_out; | |
493 | } | |
494 | ||
495 | a_o = tc_lookup_action_n(act_name); | |
496 | if (a_o == NULL) { | |
95a5afca | 497 | #ifdef CONFIG_MODULES |
1da177e4 | 498 | rtnl_unlock(); |
4bba3925 | 499 | request_module("act_%s", act_name); |
1da177e4 LT |
500 | rtnl_lock(); |
501 | ||
502 | a_o = tc_lookup_action_n(act_name); | |
503 | ||
504 | /* We dropped the RTNL semaphore in order to | |
505 | * perform the module load. So, even if we | |
506 | * succeeded in loading the module we have to | |
507 | * tell the caller to replay the request. We | |
508 | * indicate this using -EAGAIN. | |
509 | */ | |
510 | if (a_o != NULL) { | |
ab27cfb8 | 511 | err = -EAGAIN; |
1da177e4 LT |
512 | goto err_mod; |
513 | } | |
514 | #endif | |
ab27cfb8 | 515 | err = -ENOENT; |
1da177e4 LT |
516 | goto err_out; |
517 | } | |
518 | ||
ab27cfb8 | 519 | err = -ENOMEM; |
0da974f4 | 520 | a = kzalloc(sizeof(*a), GFP_KERNEL); |
1da177e4 LT |
521 | if (a == NULL) |
522 | goto err_mod; | |
1da177e4 LT |
523 | |
524 | /* backward compatibility for policer */ | |
525 | if (name == NULL) | |
ab27cfb8 | 526 | err = a_o->init(tb[TCA_ACT_OPTIONS], est, a, ovr, bind); |
1da177e4 | 527 | else |
ab27cfb8 PM |
528 | err = a_o->init(nla, est, a, ovr, bind); |
529 | if (err < 0) | |
1da177e4 LT |
530 | goto err_free; |
531 | ||
532 | /* module count goes up only when brand new policy is created | |
533 | if it exists and is only bound to in a_o->init() then | |
534 | ACT_P_CREATED is not returned (a zero is). | |
535 | */ | |
ab27cfb8 | 536 | if (err != ACT_P_CREATED) |
1da177e4 LT |
537 | module_put(a_o->owner); |
538 | a->ops = a_o; | |
1da177e4 | 539 | |
1da177e4 LT |
540 | return a; |
541 | ||
542 | err_free: | |
543 | kfree(a); | |
544 | err_mod: | |
545 | module_put(a_o->owner); | |
546 | err_out: | |
ab27cfb8 | 547 | return ERR_PTR(err); |
1da177e4 LT |
548 | } |
549 | ||
7ba699c6 | 550 | struct tc_action *tcf_action_init(struct nlattr *nla, struct nlattr *est, |
ab27cfb8 | 551 | char *name, int ovr, int bind) |
1da177e4 | 552 | { |
7ba699c6 | 553 | struct nlattr *tb[TCA_ACT_MAX_PRIO+1]; |
1da177e4 | 554 | struct tc_action *head = NULL, *act, *act_prev = NULL; |
cee63723 | 555 | int err; |
1da177e4 LT |
556 | int i; |
557 | ||
cee63723 PM |
558 | err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
559 | if (err < 0) | |
560 | return ERR_PTR(err); | |
1da177e4 | 561 | |
7ba699c6 | 562 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
ab27cfb8 PM |
563 | act = tcf_action_init_1(tb[i], est, name, ovr, bind); |
564 | if (IS_ERR(act)) | |
1da177e4 | 565 | goto err; |
7ba699c6 | 566 | act->order = i; |
1da177e4 LT |
567 | |
568 | if (head == NULL) | |
569 | head = act; | |
570 | else | |
571 | act_prev->next = act; | |
572 | act_prev = act; | |
573 | } | |
574 | return head; | |
575 | ||
576 | err: | |
577 | if (head != NULL) | |
578 | tcf_action_destroy(head, bind); | |
ab27cfb8 | 579 | return act; |
1da177e4 LT |
580 | } |
581 | ||
582 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a, | |
583 | int compat_mode) | |
584 | { | |
585 | int err = 0; | |
586 | struct gnet_dump d; | |
587 | struct tcf_act_hdr *h = a->priv; | |
10297b99 | 588 | |
1da177e4 LT |
589 | if (h == NULL) |
590 | goto errout; | |
591 | ||
592 | /* compat_mode being true specifies a call that is supposed | |
593 | * to add additional backward compatiblity statistic TLVs. | |
594 | */ | |
595 | if (compat_mode) { | |
596 | if (a->type == TCA_OLD_COMPAT) | |
597 | err = gnet_stats_start_copy_compat(skb, 0, | |
4bdf3991 | 598 | TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d); |
1da177e4 LT |
599 | else |
600 | return 0; | |
601 | } else | |
602 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
4bdf3991 | 603 | &h->tcf_lock, &d); |
1da177e4 LT |
604 | |
605 | if (err < 0) | |
606 | goto errout; | |
607 | ||
608 | if (a->ops != NULL && a->ops->get_stats != NULL) | |
609 | if (a->ops->get_stats(skb, a) < 0) | |
610 | goto errout; | |
611 | ||
e9ce1cd3 | 612 | if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 || |
e9ce1cd3 | 613 | gnet_stats_copy_rate_est(&d, &h->tcf_rate_est) < 0 || |
e9ce1cd3 | 614 | gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0) |
1da177e4 LT |
615 | goto errout; |
616 | ||
617 | if (gnet_stats_finish_copy(&d) < 0) | |
618 | goto errout; | |
619 | ||
620 | return 0; | |
621 | ||
622 | errout: | |
623 | return -1; | |
624 | } | |
625 | ||
626 | static int | |
627 | tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq, | |
10297b99 | 628 | u16 flags, int event, int bind, int ref) |
1da177e4 LT |
629 | { |
630 | struct tcamsg *t; | |
631 | struct nlmsghdr *nlh; | |
27a884dc | 632 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 633 | struct nlattr *nest; |
1da177e4 | 634 | |
e431b8c0 JHS |
635 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
636 | ||
1da177e4 LT |
637 | t = NLMSG_DATA(nlh); |
638 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
639 | t->tca__pad1 = 0; |
640 | t->tca__pad2 = 0; | |
10297b99 | 641 | |
4b3550ef PM |
642 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
643 | if (nest == NULL) | |
644 | goto nla_put_failure; | |
1da177e4 LT |
645 | |
646 | if (tcf_action_dump(skb, a, bind, ref) < 0) | |
7ba699c6 | 647 | goto nla_put_failure; |
1da177e4 | 648 | |
4b3550ef | 649 | nla_nest_end(skb, nest); |
10297b99 | 650 | |
27a884dc | 651 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
652 | return skb->len; |
653 | ||
7ba699c6 | 654 | nla_put_failure: |
1da177e4 | 655 | nlmsg_failure: |
dc5fc579 | 656 | nlmsg_trim(skb, b); |
1da177e4 LT |
657 | return -1; |
658 | } | |
659 | ||
660 | static int | |
661 | act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event) | |
662 | { | |
663 | struct sk_buff *skb; | |
1da177e4 LT |
664 | |
665 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
666 | if (!skb) | |
667 | return -ENOBUFS; | |
668 | if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { | |
669 | kfree_skb(skb); | |
670 | return -EINVAL; | |
671 | } | |
2942e900 | 672 | |
97c53cac | 673 | return rtnl_unicast(skb, &init_net, pid); |
1da177e4 LT |
674 | } |
675 | ||
676 | static struct tc_action * | |
ab27cfb8 | 677 | tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid) |
1da177e4 | 678 | { |
7ba699c6 | 679 | struct nlattr *tb[TCA_ACT_MAX+1]; |
1da177e4 LT |
680 | struct tc_action *a; |
681 | int index; | |
ab27cfb8 | 682 | int err; |
1da177e4 | 683 | |
cee63723 PM |
684 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
685 | if (err < 0) | |
ab27cfb8 | 686 | goto err_out; |
1da177e4 | 687 | |
cee63723 | 688 | err = -EINVAL; |
7ba699c6 PM |
689 | if (tb[TCA_ACT_INDEX] == NULL || |
690 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) | |
ab27cfb8 | 691 | goto err_out; |
1587bac4 | 692 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 693 | |
ab27cfb8 | 694 | err = -ENOMEM; |
0da974f4 | 695 | a = kzalloc(sizeof(struct tc_action), GFP_KERNEL); |
1da177e4 | 696 | if (a == NULL) |
ab27cfb8 | 697 | goto err_out; |
1da177e4 | 698 | |
ab27cfb8 | 699 | err = -EINVAL; |
7ba699c6 | 700 | a->ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
1da177e4 LT |
701 | if (a->ops == NULL) |
702 | goto err_free; | |
703 | if (a->ops->lookup == NULL) | |
704 | goto err_mod; | |
ab27cfb8 | 705 | err = -ENOENT; |
1da177e4 LT |
706 | if (a->ops->lookup(a, index) == 0) |
707 | goto err_mod; | |
708 | ||
709 | module_put(a->ops->owner); | |
1da177e4 | 710 | return a; |
ab27cfb8 | 711 | |
1da177e4 LT |
712 | err_mod: |
713 | module_put(a->ops->owner); | |
714 | err_free: | |
715 | kfree(a); | |
ab27cfb8 PM |
716 | err_out: |
717 | return ERR_PTR(err); | |
1da177e4 LT |
718 | } |
719 | ||
720 | static void cleanup_a(struct tc_action *act) | |
721 | { | |
722 | struct tc_action *a; | |
723 | ||
724 | for (a = act; a; a = act) { | |
725 | act = a->next; | |
726 | kfree(a); | |
727 | } | |
728 | } | |
729 | ||
730 | static struct tc_action *create_a(int i) | |
731 | { | |
732 | struct tc_action *act; | |
733 | ||
0da974f4 | 734 | act = kzalloc(sizeof(*act), GFP_KERNEL); |
1da177e4 LT |
735 | if (act == NULL) { |
736 | printk("create_a: failed to alloc!\n"); | |
737 | return NULL; | |
738 | } | |
1da177e4 LT |
739 | act->order = i; |
740 | return act; | |
741 | } | |
742 | ||
7ba699c6 | 743 | static int tca_action_flush(struct nlattr *nla, struct nlmsghdr *n, u32 pid) |
1da177e4 LT |
744 | { |
745 | struct sk_buff *skb; | |
746 | unsigned char *b; | |
747 | struct nlmsghdr *nlh; | |
748 | struct tcamsg *t; | |
749 | struct netlink_callback dcb; | |
4b3550ef | 750 | struct nlattr *nest; |
7ba699c6 PM |
751 | struct nlattr *tb[TCA_ACT_MAX+1]; |
752 | struct nlattr *kind; | |
1da177e4 | 753 | struct tc_action *a = create_a(0); |
36723873 | 754 | int err = -ENOMEM; |
1da177e4 LT |
755 | |
756 | if (a == NULL) { | |
757 | printk("tca_action_flush: couldnt create tc_action\n"); | |
758 | return err; | |
759 | } | |
760 | ||
761 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
762 | if (!skb) { | |
763 | printk("tca_action_flush: failed skb alloc\n"); | |
764 | kfree(a); | |
36723873 | 765 | return err; |
1da177e4 LT |
766 | } |
767 | ||
27a884dc | 768 | b = skb_tail_pointer(skb); |
1da177e4 | 769 | |
cee63723 PM |
770 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
771 | if (err < 0) | |
1da177e4 LT |
772 | goto err_out; |
773 | ||
cee63723 | 774 | err = -EINVAL; |
7ba699c6 | 775 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
776 | a->ops = tc_lookup_action(kind); |
777 | if (a->ops == NULL) | |
778 | goto err_out; | |
779 | ||
780 | nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t)); | |
781 | t = NLMSG_DATA(nlh); | |
782 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
783 | t->tca__pad1 = 0; |
784 | t->tca__pad2 = 0; | |
1da177e4 | 785 | |
4b3550ef PM |
786 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
787 | if (nest == NULL) | |
788 | goto nla_put_failure; | |
1da177e4 LT |
789 | |
790 | err = a->ops->walk(skb, &dcb, RTM_DELACTION, a); | |
791 | if (err < 0) | |
7ba699c6 | 792 | goto nla_put_failure; |
f97017cd JHS |
793 | if (err == 0) |
794 | goto noflush_out; | |
1da177e4 | 795 | |
4b3550ef | 796 | nla_nest_end(skb, nest); |
1da177e4 | 797 | |
27a884dc | 798 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
799 | nlh->nlmsg_flags |= NLM_F_ROOT; |
800 | module_put(a->ops->owner); | |
801 | kfree(a); | |
97c53cac | 802 | err = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
803 | if (err > 0) |
804 | return 0; | |
805 | ||
806 | return err; | |
807 | ||
7ba699c6 | 808 | nla_put_failure: |
1da177e4 | 809 | nlmsg_failure: |
ebbaeab1 | 810 | module_put(a->ops->owner); |
1da177e4 | 811 | err_out: |
f97017cd | 812 | noflush_out: |
1da177e4 LT |
813 | kfree_skb(skb); |
814 | kfree(a); | |
815 | return err; | |
816 | } | |
817 | ||
818 | static int | |
7ba699c6 | 819 | tca_action_gd(struct nlattr *nla, struct nlmsghdr *n, u32 pid, int event) |
1da177e4 | 820 | { |
cee63723 | 821 | int i, ret; |
7ba699c6 | 822 | struct nlattr *tb[TCA_ACT_MAX_PRIO+1]; |
1da177e4 LT |
823 | struct tc_action *head = NULL, *act, *act_prev = NULL; |
824 | ||
cee63723 PM |
825 | ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
826 | if (ret < 0) | |
827 | return ret; | |
1da177e4 LT |
828 | |
829 | if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) { | |
f97017cd JHS |
830 | if (tb[1] != NULL) |
831 | return tca_action_flush(tb[1], n, pid); | |
832 | else | |
833 | return -EINVAL; | |
1da177e4 LT |
834 | } |
835 | ||
7ba699c6 | 836 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
ab27cfb8 PM |
837 | act = tcf_action_get_1(tb[i], n, pid); |
838 | if (IS_ERR(act)) { | |
839 | ret = PTR_ERR(act); | |
1da177e4 | 840 | goto err; |
ab27cfb8 | 841 | } |
7ba699c6 | 842 | act->order = i; |
1da177e4 LT |
843 | |
844 | if (head == NULL) | |
845 | head = act; | |
846 | else | |
847 | act_prev->next = act; | |
848 | act_prev = act; | |
849 | } | |
850 | ||
851 | if (event == RTM_GETACTION) | |
852 | ret = act_get_notify(pid, n, head, event); | |
853 | else { /* delete */ | |
854 | struct sk_buff *skb; | |
855 | ||
856 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
857 | if (!skb) { | |
858 | ret = -ENOBUFS; | |
859 | goto err; | |
860 | } | |
861 | ||
862 | if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event, | |
10297b99 | 863 | 0, 1) <= 0) { |
1da177e4 LT |
864 | kfree_skb(skb); |
865 | ret = -EINVAL; | |
866 | goto err; | |
867 | } | |
868 | ||
869 | /* now do the delete */ | |
870 | tcf_action_destroy(head, 0); | |
97c53cac | 871 | ret = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, |
10297b99 | 872 | n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
873 | if (ret > 0) |
874 | return 0; | |
875 | return ret; | |
876 | } | |
877 | err: | |
878 | cleanup_a(head); | |
879 | return ret; | |
880 | } | |
881 | ||
882 | static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event, | |
10297b99 | 883 | u16 flags) |
1da177e4 LT |
884 | { |
885 | struct tcamsg *t; | |
886 | struct nlmsghdr *nlh; | |
887 | struct sk_buff *skb; | |
4b3550ef | 888 | struct nlattr *nest; |
1da177e4 LT |
889 | unsigned char *b; |
890 | int err = 0; | |
891 | ||
892 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
893 | if (!skb) | |
894 | return -ENOBUFS; | |
895 | ||
27a884dc | 896 | b = skb_tail_pointer(skb); |
1da177e4 | 897 | |
e431b8c0 | 898 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
1da177e4 LT |
899 | t = NLMSG_DATA(nlh); |
900 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
901 | t->tca__pad1 = 0; |
902 | t->tca__pad2 = 0; | |
903 | ||
4b3550ef PM |
904 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
905 | if (nest == NULL) | |
906 | goto nla_put_failure; | |
1da177e4 LT |
907 | |
908 | if (tcf_action_dump(skb, a, 0, 0) < 0) | |
7ba699c6 | 909 | goto nla_put_failure; |
1da177e4 | 910 | |
4b3550ef | 911 | nla_nest_end(skb, nest); |
10297b99 | 912 | |
27a884dc | 913 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
ac6d439d | 914 | NETLINK_CB(skb).dst_group = RTNLGRP_TC; |
10297b99 | 915 | |
97c53cac | 916 | err = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, flags&NLM_F_ECHO); |
1da177e4 LT |
917 | if (err > 0) |
918 | err = 0; | |
919 | return err; | |
920 | ||
7ba699c6 | 921 | nla_put_failure: |
1da177e4 | 922 | nlmsg_failure: |
f6e57464 | 923 | kfree_skb(skb); |
1da177e4 LT |
924 | return -1; |
925 | } | |
926 | ||
10297b99 | 927 | |
1da177e4 | 928 | static int |
7ba699c6 | 929 | tcf_action_add(struct nlattr *nla, struct nlmsghdr *n, u32 pid, int ovr) |
1da177e4 LT |
930 | { |
931 | int ret = 0; | |
932 | struct tc_action *act; | |
933 | struct tc_action *a; | |
934 | u32 seq = n->nlmsg_seq; | |
935 | ||
ab27cfb8 | 936 | act = tcf_action_init(nla, NULL, NULL, ovr, 0); |
1da177e4 LT |
937 | if (act == NULL) |
938 | goto done; | |
ab27cfb8 PM |
939 | if (IS_ERR(act)) { |
940 | ret = PTR_ERR(act); | |
941 | goto done; | |
942 | } | |
1da177e4 LT |
943 | |
944 | /* dump then free all the actions after update; inserted policy | |
945 | * stays intact | |
946 | * */ | |
947 | ret = tcf_add_notify(act, pid, seq, RTM_NEWACTION, n->nlmsg_flags); | |
948 | for (a = act; a; a = act) { | |
949 | act = a->next; | |
950 | kfree(a); | |
951 | } | |
952 | done: | |
953 | return ret; | |
954 | } | |
955 | ||
956 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
957 | { | |
3b1e0a65 | 958 | struct net *net = sock_net(skb->sk); |
7ba699c6 | 959 | struct nlattr *tca[TCA_ACT_MAX + 1]; |
1da177e4 LT |
960 | u32 pid = skb ? NETLINK_CB(skb).pid : 0; |
961 | int ret = 0, ovr = 0; | |
962 | ||
b854272b DL |
963 | if (net != &init_net) |
964 | return -EINVAL; | |
965 | ||
7ba699c6 PM |
966 | ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL); |
967 | if (ret < 0) | |
968 | return ret; | |
969 | ||
970 | if (tca[TCA_ACT_TAB] == NULL) { | |
1da177e4 LT |
971 | printk("tc_ctl_action: received NO action attribs\n"); |
972 | return -EINVAL; | |
973 | } | |
974 | ||
975 | /* n->nlmsg_flags&NLM_F_CREATE | |
976 | * */ | |
977 | switch (n->nlmsg_type) { | |
978 | case RTM_NEWACTION: | |
979 | /* we are going to assume all other flags | |
980 | * imply create only if it doesnt exist | |
981 | * Note that CREATE | EXCL implies that | |
982 | * but since we want avoid ambiguity (eg when flags | |
983 | * is zero) then just set this | |
984 | */ | |
985 | if (n->nlmsg_flags&NLM_F_REPLACE) | |
986 | ovr = 1; | |
987 | replay: | |
7ba699c6 | 988 | ret = tcf_action_add(tca[TCA_ACT_TAB], n, pid, ovr); |
1da177e4 LT |
989 | if (ret == -EAGAIN) |
990 | goto replay; | |
991 | break; | |
992 | case RTM_DELACTION: | |
7ba699c6 | 993 | ret = tca_action_gd(tca[TCA_ACT_TAB], n, pid, RTM_DELACTION); |
1da177e4 LT |
994 | break; |
995 | case RTM_GETACTION: | |
7ba699c6 | 996 | ret = tca_action_gd(tca[TCA_ACT_TAB], n, pid, RTM_GETACTION); |
1da177e4 LT |
997 | break; |
998 | default: | |
999 | BUG(); | |
1000 | } | |
1001 | ||
1002 | return ret; | |
1003 | } | |
1004 | ||
7ba699c6 | 1005 | static struct nlattr * |
1da177e4 LT |
1006 | find_dump_kind(struct nlmsghdr *n) |
1007 | { | |
7ba699c6 PM |
1008 | struct nlattr *tb1, *tb2[TCA_ACT_MAX+1]; |
1009 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; | |
1010 | struct nlattr *nla[TCAA_MAX + 1]; | |
1011 | struct nlattr *kind; | |
1da177e4 | 1012 | |
c96c9471 | 1013 | if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0) |
1da177e4 | 1014 | return NULL; |
7ba699c6 | 1015 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
1016 | if (tb1 == NULL) |
1017 | return NULL; | |
1018 | ||
7ba699c6 PM |
1019 | if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), |
1020 | NLMSG_ALIGN(nla_len(tb1)), NULL) < 0) | |
1da177e4 | 1021 | return NULL; |
1da177e4 | 1022 | |
6d834e04 PM |
1023 | if (tb[1] == NULL) |
1024 | return NULL; | |
1025 | if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]), | |
1026 | nla_len(tb[1]), NULL) < 0) | |
1da177e4 | 1027 | return NULL; |
7ba699c6 | 1028 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 1029 | |
26dab893 | 1030 | return kind; |
1da177e4 LT |
1031 | } |
1032 | ||
1033 | static int | |
1034 | tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) | |
1035 | { | |
3b1e0a65 | 1036 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1037 | struct nlmsghdr *nlh; |
27a884dc | 1038 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1039 | struct nlattr *nest; |
1da177e4 LT |
1040 | struct tc_action_ops *a_o; |
1041 | struct tc_action a; | |
1042 | int ret = 0; | |
1043 | struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh); | |
7ba699c6 | 1044 | struct nlattr *kind = find_dump_kind(cb->nlh); |
1da177e4 | 1045 | |
b854272b DL |
1046 | if (net != &init_net) |
1047 | return 0; | |
1048 | ||
1da177e4 LT |
1049 | if (kind == NULL) { |
1050 | printk("tc_dump_action: action bad kind\n"); | |
1051 | return 0; | |
1052 | } | |
1053 | ||
26dab893 | 1054 | a_o = tc_lookup_action(kind); |
1da177e4 | 1055 | if (a_o == NULL) { |
1da177e4 LT |
1056 | return 0; |
1057 | } | |
1058 | ||
1059 | memset(&a, 0, sizeof(struct tc_action)); | |
1060 | a.ops = a_o; | |
1061 | ||
1062 | if (a_o->walk == NULL) { | |
26dab893 | 1063 | printk("tc_dump_action: %s !capable of dumping table\n", a_o->kind); |
7ba699c6 | 1064 | goto nla_put_failure; |
1da177e4 LT |
1065 | } |
1066 | ||
1067 | nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, | |
10297b99 | 1068 | cb->nlh->nlmsg_type, sizeof(*t)); |
1da177e4 LT |
1069 | t = NLMSG_DATA(nlh); |
1070 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
1071 | t->tca__pad1 = 0; |
1072 | t->tca__pad2 = 0; | |
1da177e4 | 1073 | |
4b3550ef PM |
1074 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
1075 | if (nest == NULL) | |
1076 | goto nla_put_failure; | |
1da177e4 LT |
1077 | |
1078 | ret = a_o->walk(skb, cb, RTM_GETACTION, &a); | |
1079 | if (ret < 0) | |
7ba699c6 | 1080 | goto nla_put_failure; |
1da177e4 LT |
1081 | |
1082 | if (ret > 0) { | |
4b3550ef | 1083 | nla_nest_end(skb, nest); |
1da177e4 LT |
1084 | ret = skb->len; |
1085 | } else | |
4b3550ef | 1086 | nla_nest_cancel(skb, nest); |
1da177e4 | 1087 | |
27a884dc | 1088 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1089 | if (NETLINK_CB(cb->skb).pid && ret) |
1090 | nlh->nlmsg_flags |= NLM_F_MULTI; | |
1091 | module_put(a_o->owner); | |
1092 | return skb->len; | |
1093 | ||
7ba699c6 | 1094 | nla_put_failure: |
1da177e4 LT |
1095 | nlmsg_failure: |
1096 | module_put(a_o->owner); | |
dc5fc579 | 1097 | nlmsg_trim(skb, b); |
1da177e4 LT |
1098 | return skb->len; |
1099 | } | |
1100 | ||
1101 | static int __init tc_action_init(void) | |
1102 | { | |
708914cc TG |
1103 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL); |
1104 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL); | |
1105 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action); | |
1da177e4 | 1106 | |
1da177e4 LT |
1107 | return 0; |
1108 | } | |
1109 | ||
1110 | subsys_initcall(tc_action_init); |