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); | |
c7de2cf0 ED |
41 | /* |
42 | * gen_estimator est_timer() might access p->tcfc_lock | |
43 | * or bstats, wait a RCU grace period before freeing p | |
44 | */ | |
f5c8593c | 45 | kfree_rcu(p, tcfc_rcu); |
e9ce1cd3 DM |
46 | return; |
47 | } | |
48 | } | |
547b792c | 49 | WARN_ON(1); |
e9ce1cd3 DM |
50 | } |
51 | EXPORT_SYMBOL(tcf_hash_destroy); | |
52 | ||
53 | int tcf_hash_release(struct tcf_common *p, int bind, | |
54 | struct tcf_hashinfo *hinfo) | |
55 | { | |
56 | int ret = 0; | |
57 | ||
58 | if (p) { | |
59 | if (bind) | |
60 | p->tcfc_bindcnt--; | |
61 | ||
62 | p->tcfc_refcnt--; | |
10297b99 | 63 | if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) { |
e9ce1cd3 DM |
64 | tcf_hash_destroy(p, hinfo); |
65 | ret = 1; | |
66 | } | |
67 | } | |
68 | return ret; | |
69 | } | |
70 | EXPORT_SYMBOL(tcf_hash_release); | |
71 | ||
72 | static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
73 | struct tc_action *a, struct tcf_hashinfo *hinfo) | |
74 | { | |
75 | struct tcf_common *p; | |
cc7ec456 | 76 | int err = 0, index = -1, i = 0, s_i = 0, n_i = 0; |
4b3550ef | 77 | struct nlattr *nest; |
e9ce1cd3 | 78 | |
e1e992e5 | 79 | read_lock_bh(hinfo->lock); |
e9ce1cd3 DM |
80 | |
81 | s_i = cb->args[0]; | |
82 | ||
83 | for (i = 0; i < (hinfo->hmask + 1); i++) { | |
84 | p = hinfo->htab[tcf_hash(i, hinfo->hmask)]; | |
85 | ||
86 | for (; p; p = p->tcfc_next) { | |
87 | index++; | |
88 | if (index < s_i) | |
89 | continue; | |
90 | a->priv = p; | |
91 | a->order = n_i; | |
4b3550ef PM |
92 | |
93 | nest = nla_nest_start(skb, a->order); | |
94 | if (nest == NULL) | |
95 | goto nla_put_failure; | |
e9ce1cd3 DM |
96 | err = tcf_action_dump_1(skb, a, 0, 0); |
97 | if (err < 0) { | |
98 | index--; | |
4b3550ef | 99 | nlmsg_trim(skb, nest); |
e9ce1cd3 DM |
100 | goto done; |
101 | } | |
4b3550ef | 102 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
103 | n_i++; |
104 | if (n_i >= TCA_ACT_MAX_PRIO) | |
105 | goto done; | |
106 | } | |
107 | } | |
108 | done: | |
e1e992e5 | 109 | read_unlock_bh(hinfo->lock); |
e9ce1cd3 DM |
110 | if (n_i) |
111 | cb->args[0] += n_i; | |
112 | return n_i; | |
113 | ||
7ba699c6 | 114 | nla_put_failure: |
4b3550ef | 115 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
116 | goto done; |
117 | } | |
118 | ||
119 | static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a, | |
120 | struct tcf_hashinfo *hinfo) | |
121 | { | |
122 | struct tcf_common *p, *s_p; | |
4b3550ef | 123 | struct nlattr *nest; |
cc7ec456 | 124 | int i = 0, n_i = 0; |
e9ce1cd3 | 125 | |
4b3550ef PM |
126 | nest = nla_nest_start(skb, a->order); |
127 | if (nest == NULL) | |
128 | goto nla_put_failure; | |
57e1c487 | 129 | NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind); |
e9ce1cd3 DM |
130 | for (i = 0; i < (hinfo->hmask + 1); i++) { |
131 | p = hinfo->htab[tcf_hash(i, hinfo->hmask)]; | |
132 | ||
133 | while (p != NULL) { | |
134 | s_p = p->tcfc_next; | |
135 | if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo)) | |
cc7ec456 | 136 | module_put(a->ops->owner); |
e9ce1cd3 DM |
137 | n_i++; |
138 | p = s_p; | |
139 | } | |
140 | } | |
24beeab5 | 141 | NLA_PUT_U32(skb, TCA_FCNT, n_i); |
4b3550ef | 142 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
143 | |
144 | return n_i; | |
7ba699c6 | 145 | nla_put_failure: |
4b3550ef | 146 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
147 | return -EINVAL; |
148 | } | |
149 | ||
150 | int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
151 | int type, struct tc_action *a) | |
152 | { | |
153 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
154 | ||
155 | if (type == RTM_DELACTION) { | |
156 | return tcf_del_walker(skb, a, hinfo); | |
157 | } else if (type == RTM_GETACTION) { | |
158 | return tcf_dump_walker(skb, cb, a, hinfo); | |
159 | } else { | |
6ff9c364 | 160 | WARN(1, "tcf_generic_walker: unknown action %d\n", type); |
e9ce1cd3 DM |
161 | return -EINVAL; |
162 | } | |
163 | } | |
164 | EXPORT_SYMBOL(tcf_generic_walker); | |
165 | ||
166 | struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo) | |
167 | { | |
168 | struct tcf_common *p; | |
169 | ||
e1e992e5 | 170 | read_lock_bh(hinfo->lock); |
e9ce1cd3 DM |
171 | for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p; |
172 | p = p->tcfc_next) { | |
173 | if (p->tcfc_index == index) | |
174 | break; | |
175 | } | |
e1e992e5 | 176 | read_unlock_bh(hinfo->lock); |
e9ce1cd3 DM |
177 | |
178 | return p; | |
179 | } | |
180 | EXPORT_SYMBOL(tcf_hash_lookup); | |
181 | ||
182 | u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo) | |
183 | { | |
184 | u32 val = *idx_gen; | |
185 | ||
186 | do { | |
187 | if (++val == 0) | |
188 | val = 1; | |
189 | } while (tcf_hash_lookup(val, hinfo)); | |
190 | ||
191 | return (*idx_gen = val); | |
192 | } | |
193 | EXPORT_SYMBOL(tcf_hash_new_index); | |
194 | ||
195 | int tcf_hash_search(struct tc_action *a, u32 index) | |
196 | { | |
197 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
198 | struct tcf_common *p = tcf_hash_lookup(index, hinfo); | |
199 | ||
200 | if (p) { | |
201 | a->priv = p; | |
202 | return 1; | |
203 | } | |
204 | return 0; | |
205 | } | |
206 | EXPORT_SYMBOL(tcf_hash_search); | |
207 | ||
208 | struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind, | |
209 | struct tcf_hashinfo *hinfo) | |
210 | { | |
211 | struct tcf_common *p = NULL; | |
212 | if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) { | |
76aab2c1 | 213 | if (bind) |
e9ce1cd3 | 214 | p->tcfc_bindcnt++; |
76aab2c1 | 215 | p->tcfc_refcnt++; |
e9ce1cd3 DM |
216 | a->priv = p; |
217 | } | |
218 | return p; | |
219 | } | |
220 | EXPORT_SYMBOL(tcf_hash_check); | |
221 | ||
0e991ec6 SH |
222 | struct tcf_common *tcf_hash_create(u32 index, struct nlattr *est, |
223 | struct tc_action *a, int size, int bind, | |
224 | u32 *idx_gen, struct tcf_hashinfo *hinfo) | |
e9ce1cd3 DM |
225 | { |
226 | struct tcf_common *p = kzalloc(size, GFP_KERNEL); | |
227 | ||
228 | if (unlikely(!p)) | |
0e991ec6 | 229 | return ERR_PTR(-ENOMEM); |
e9ce1cd3 DM |
230 | p->tcfc_refcnt = 1; |
231 | if (bind) | |
232 | p->tcfc_bindcnt = 1; | |
233 | ||
234 | spin_lock_init(&p->tcfc_lock); | |
e9ce1cd3 DM |
235 | p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo); |
236 | p->tcfc_tm.install = jiffies; | |
237 | p->tcfc_tm.lastuse = jiffies; | |
0e991ec6 SH |
238 | if (est) { |
239 | int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est, | |
240 | &p->tcfc_lock, est); | |
241 | if (err) { | |
242 | kfree(p); | |
243 | return ERR_PTR(err); | |
244 | } | |
245 | } | |
246 | ||
e9ce1cd3 DM |
247 | a->priv = (void *) p; |
248 | return p; | |
249 | } | |
250 | EXPORT_SYMBOL(tcf_hash_create); | |
251 | ||
252 | void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo) | |
253 | { | |
254 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); | |
255 | ||
256 | write_lock_bh(hinfo->lock); | |
257 | p->tcfc_next = hinfo->htab[h]; | |
258 | hinfo->htab[h] = p; | |
259 | write_unlock_bh(hinfo->lock); | |
260 | } | |
261 | EXPORT_SYMBOL(tcf_hash_insert); | |
1da177e4 LT |
262 | |
263 | static struct tc_action_ops *act_base = NULL; | |
264 | static DEFINE_RWLOCK(act_mod_lock); | |
265 | ||
266 | int tcf_register_action(struct tc_action_ops *act) | |
267 | { | |
268 | struct tc_action_ops *a, **ap; | |
269 | ||
270 | write_lock(&act_mod_lock); | |
271 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) { | |
272 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { | |
273 | write_unlock(&act_mod_lock); | |
274 | return -EEXIST; | |
275 | } | |
276 | } | |
277 | act->next = NULL; | |
278 | *ap = act; | |
279 | write_unlock(&act_mod_lock); | |
280 | return 0; | |
281 | } | |
62e3ba1b | 282 | EXPORT_SYMBOL(tcf_register_action); |
1da177e4 LT |
283 | |
284 | int tcf_unregister_action(struct tc_action_ops *act) | |
285 | { | |
286 | struct tc_action_ops *a, **ap; | |
287 | int err = -ENOENT; | |
288 | ||
289 | write_lock(&act_mod_lock); | |
290 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) | |
291 | if (a == act) | |
292 | break; | |
293 | if (a) { | |
294 | *ap = a->next; | |
295 | a->next = NULL; | |
296 | err = 0; | |
297 | } | |
298 | write_unlock(&act_mod_lock); | |
299 | return err; | |
300 | } | |
62e3ba1b | 301 | EXPORT_SYMBOL(tcf_unregister_action); |
1da177e4 LT |
302 | |
303 | /* lookup by name */ | |
304 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
305 | { | |
306 | struct tc_action_ops *a = NULL; | |
307 | ||
308 | if (kind) { | |
309 | read_lock(&act_mod_lock); | |
310 | for (a = act_base; a; a = a->next) { | |
311 | if (strcmp(kind, a->kind) == 0) { | |
312 | if (!try_module_get(a->owner)) { | |
313 | read_unlock(&act_mod_lock); | |
314 | return NULL; | |
315 | } | |
316 | break; | |
317 | } | |
318 | } | |
319 | read_unlock(&act_mod_lock); | |
320 | } | |
321 | return a; | |
322 | } | |
323 | ||
7ba699c6 PM |
324 | /* lookup by nlattr */ |
325 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) | |
1da177e4 LT |
326 | { |
327 | struct tc_action_ops *a = NULL; | |
328 | ||
329 | if (kind) { | |
330 | read_lock(&act_mod_lock); | |
331 | for (a = act_base; a; a = a->next) { | |
7ba699c6 | 332 | if (nla_strcmp(kind, a->kind) == 0) { |
1da177e4 LT |
333 | if (!try_module_get(a->owner)) { |
334 | read_unlock(&act_mod_lock); | |
335 | return NULL; | |
336 | } | |
337 | break; | |
338 | } | |
339 | } | |
340 | read_unlock(&act_mod_lock); | |
341 | } | |
342 | return a; | |
343 | } | |
344 | ||
345 | #if 0 | |
346 | /* lookup by id */ | |
347 | static struct tc_action_ops *tc_lookup_action_id(u32 type) | |
348 | { | |
349 | struct tc_action_ops *a = NULL; | |
350 | ||
351 | if (type) { | |
352 | read_lock(&act_mod_lock); | |
353 | for (a = act_base; a; a = a->next) { | |
354 | if (a->type == type) { | |
355 | if (!try_module_get(a->owner)) { | |
356 | read_unlock(&act_mod_lock); | |
357 | return NULL; | |
358 | } | |
359 | break; | |
360 | } | |
361 | } | |
362 | read_unlock(&act_mod_lock); | |
363 | } | |
364 | return a; | |
365 | } | |
366 | #endif | |
367 | ||
368 | int tcf_action_exec(struct sk_buff *skb, struct tc_action *act, | |
10297b99 | 369 | struct tcf_result *res) |
1da177e4 LT |
370 | { |
371 | struct tc_action *a; | |
372 | int ret = -1; | |
373 | ||
374 | if (skb->tc_verd & TC_NCLS) { | |
375 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
1da177e4 LT |
376 | ret = TC_ACT_OK; |
377 | goto exec_done; | |
378 | } | |
379 | while ((a = act) != NULL) { | |
380 | repeat: | |
381 | if (a->ops && a->ops->act) { | |
f43c5a0d | 382 | ret = a->ops->act(skb, a, res); |
1da177e4 LT |
383 | if (TC_MUNGED & skb->tc_verd) { |
384 | /* copied already, allow trampling */ | |
385 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); | |
386 | skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd); | |
387 | } | |
1da177e4 LT |
388 | if (ret == TC_ACT_REPEAT) |
389 | goto repeat; /* we need a ttl - JHS */ | |
14d50e78 HS |
390 | if (ret != TC_ACT_PIPE) |
391 | goto exec_done; | |
1da177e4 LT |
392 | } |
393 | act = a->next; | |
394 | } | |
395 | exec_done: | |
1da177e4 LT |
396 | return ret; |
397 | } | |
62e3ba1b | 398 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 LT |
399 | |
400 | void tcf_action_destroy(struct tc_action *act, int bind) | |
401 | { | |
402 | struct tc_action *a; | |
403 | ||
404 | for (a = act; a; a = act) { | |
405 | if (a->ops && a->ops->cleanup) { | |
1da177e4 LT |
406 | if (a->ops->cleanup(a, bind) == ACT_P_DELETED) |
407 | module_put(a->ops->owner); | |
408 | act = act->next; | |
409 | kfree(a); | |
6ff9c364 | 410 | } else { |
411 | /*FIXME: Remove later - catch insertion bugs*/ | |
412 | WARN(1, "tcf_action_destroy: BUG? destroying NULL ops\n"); | |
1da177e4 LT |
413 | act = act->next; |
414 | kfree(a); | |
415 | } | |
416 | } | |
417 | } | |
418 | ||
419 | int | |
420 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
421 | { | |
422 | int err = -EINVAL; | |
423 | ||
424 | if (a->ops == NULL || a->ops->dump == NULL) | |
425 | return err; | |
426 | return a->ops->dump(skb, a, bind, ref); | |
427 | } | |
428 | ||
429 | int | |
430 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
431 | { | |
432 | int err = -EINVAL; | |
27a884dc | 433 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 434 | struct nlattr *nest; |
1da177e4 LT |
435 | |
436 | if (a->ops == NULL || a->ops->dump == NULL) | |
437 | return err; | |
438 | ||
57e1c487 | 439 | NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind); |
1da177e4 | 440 | if (tcf_action_copy_stats(skb, a, 0)) |
7ba699c6 | 441 | goto nla_put_failure; |
4b3550ef PM |
442 | nest = nla_nest_start(skb, TCA_OPTIONS); |
443 | if (nest == NULL) | |
444 | goto nla_put_failure; | |
cc7ec456 ED |
445 | err = tcf_action_dump_old(skb, a, bind, ref); |
446 | if (err > 0) { | |
4b3550ef | 447 | nla_nest_end(skb, nest); |
1da177e4 LT |
448 | return err; |
449 | } | |
450 | ||
7ba699c6 | 451 | nla_put_failure: |
dc5fc579 | 452 | nlmsg_trim(skb, b); |
1da177e4 LT |
453 | return -1; |
454 | } | |
62e3ba1b | 455 | EXPORT_SYMBOL(tcf_action_dump_1); |
1da177e4 LT |
456 | |
457 | int | |
458 | tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref) | |
459 | { | |
460 | struct tc_action *a; | |
461 | int err = -EINVAL; | |
4b3550ef | 462 | struct nlattr *nest; |
1da177e4 LT |
463 | |
464 | while ((a = act) != NULL) { | |
1da177e4 | 465 | act = a->next; |
4b3550ef PM |
466 | nest = nla_nest_start(skb, a->order); |
467 | if (nest == NULL) | |
468 | goto nla_put_failure; | |
1da177e4 LT |
469 | err = tcf_action_dump_1(skb, a, bind, ref); |
470 | if (err < 0) | |
4fe683f5 | 471 | goto errout; |
4b3550ef | 472 | nla_nest_end(skb, nest); |
1da177e4 LT |
473 | } |
474 | ||
475 | return 0; | |
476 | ||
7ba699c6 | 477 | nla_put_failure: |
4fe683f5 TG |
478 | err = -EINVAL; |
479 | errout: | |
4b3550ef | 480 | nla_nest_cancel(skb, nest); |
4fe683f5 | 481 | return err; |
1da177e4 LT |
482 | } |
483 | ||
7ba699c6 | 484 | struct tc_action *tcf_action_init_1(struct nlattr *nla, struct nlattr *est, |
ab27cfb8 | 485 | char *name, int ovr, int bind) |
1da177e4 LT |
486 | { |
487 | struct tc_action *a; | |
488 | struct tc_action_ops *a_o; | |
489 | char act_name[IFNAMSIZ]; | |
cc7ec456 | 490 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 491 | struct nlattr *kind; |
ab27cfb8 | 492 | int err; |
1da177e4 | 493 | |
1da177e4 | 494 | if (name == NULL) { |
cee63723 PM |
495 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
496 | if (err < 0) | |
1da177e4 | 497 | goto err_out; |
cee63723 | 498 | err = -EINVAL; |
7ba699c6 | 499 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
500 | if (kind == NULL) |
501 | goto err_out; | |
7ba699c6 | 502 | if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) |
1da177e4 LT |
503 | goto err_out; |
504 | } else { | |
cee63723 | 505 | err = -EINVAL; |
1da177e4 LT |
506 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) |
507 | goto err_out; | |
508 | } | |
509 | ||
510 | a_o = tc_lookup_action_n(act_name); | |
511 | if (a_o == NULL) { | |
95a5afca | 512 | #ifdef CONFIG_MODULES |
1da177e4 | 513 | rtnl_unlock(); |
4bba3925 | 514 | request_module("act_%s", act_name); |
1da177e4 LT |
515 | rtnl_lock(); |
516 | ||
517 | a_o = tc_lookup_action_n(act_name); | |
518 | ||
519 | /* We dropped the RTNL semaphore in order to | |
520 | * perform the module load. So, even if we | |
521 | * succeeded in loading the module we have to | |
522 | * tell the caller to replay the request. We | |
523 | * indicate this using -EAGAIN. | |
524 | */ | |
525 | if (a_o != NULL) { | |
ab27cfb8 | 526 | err = -EAGAIN; |
1da177e4 LT |
527 | goto err_mod; |
528 | } | |
529 | #endif | |
ab27cfb8 | 530 | err = -ENOENT; |
1da177e4 LT |
531 | goto err_out; |
532 | } | |
533 | ||
ab27cfb8 | 534 | err = -ENOMEM; |
0da974f4 | 535 | a = kzalloc(sizeof(*a), GFP_KERNEL); |
1da177e4 LT |
536 | if (a == NULL) |
537 | goto err_mod; | |
1da177e4 LT |
538 | |
539 | /* backward compatibility for policer */ | |
540 | if (name == NULL) | |
ab27cfb8 | 541 | err = a_o->init(tb[TCA_ACT_OPTIONS], est, a, ovr, bind); |
1da177e4 | 542 | else |
ab27cfb8 PM |
543 | err = a_o->init(nla, est, a, ovr, bind); |
544 | if (err < 0) | |
1da177e4 LT |
545 | goto err_free; |
546 | ||
547 | /* module count goes up only when brand new policy is created | |
cc7ec456 ED |
548 | * if it exists and is only bound to in a_o->init() then |
549 | * ACT_P_CREATED is not returned (a zero is). | |
550 | */ | |
ab27cfb8 | 551 | if (err != ACT_P_CREATED) |
1da177e4 LT |
552 | module_put(a_o->owner); |
553 | a->ops = a_o; | |
1da177e4 | 554 | |
1da177e4 LT |
555 | return a; |
556 | ||
557 | err_free: | |
558 | kfree(a); | |
559 | err_mod: | |
560 | module_put(a_o->owner); | |
561 | err_out: | |
ab27cfb8 | 562 | return ERR_PTR(err); |
1da177e4 LT |
563 | } |
564 | ||
7ba699c6 | 565 | struct tc_action *tcf_action_init(struct nlattr *nla, struct nlattr *est, |
ab27cfb8 | 566 | char *name, int ovr, int bind) |
1da177e4 | 567 | { |
cc7ec456 | 568 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
1da177e4 | 569 | struct tc_action *head = NULL, *act, *act_prev = NULL; |
cee63723 | 570 | int err; |
1da177e4 LT |
571 | int i; |
572 | ||
cee63723 PM |
573 | err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
574 | if (err < 0) | |
575 | return ERR_PTR(err); | |
1da177e4 | 576 | |
7ba699c6 | 577 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
ab27cfb8 PM |
578 | act = tcf_action_init_1(tb[i], est, name, ovr, bind); |
579 | if (IS_ERR(act)) | |
1da177e4 | 580 | goto err; |
7ba699c6 | 581 | act->order = i; |
1da177e4 LT |
582 | |
583 | if (head == NULL) | |
584 | head = act; | |
585 | else | |
586 | act_prev->next = act; | |
587 | act_prev = act; | |
588 | } | |
589 | return head; | |
590 | ||
591 | err: | |
592 | if (head != NULL) | |
593 | tcf_action_destroy(head, bind); | |
ab27cfb8 | 594 | return act; |
1da177e4 LT |
595 | } |
596 | ||
597 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a, | |
598 | int compat_mode) | |
599 | { | |
600 | int err = 0; | |
601 | struct gnet_dump d; | |
602 | struct tcf_act_hdr *h = a->priv; | |
10297b99 | 603 | |
1da177e4 LT |
604 | if (h == NULL) |
605 | goto errout; | |
606 | ||
607 | /* compat_mode being true specifies a call that is supposed | |
06fe9fb4 | 608 | * to add additional backward compatibility statistic TLVs. |
1da177e4 LT |
609 | */ |
610 | if (compat_mode) { | |
611 | if (a->type == TCA_OLD_COMPAT) | |
612 | err = gnet_stats_start_copy_compat(skb, 0, | |
4bdf3991 | 613 | TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d); |
1da177e4 LT |
614 | else |
615 | return 0; | |
616 | } else | |
617 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
4bdf3991 | 618 | &h->tcf_lock, &d); |
1da177e4 LT |
619 | |
620 | if (err < 0) | |
621 | goto errout; | |
622 | ||
623 | if (a->ops != NULL && a->ops->get_stats != NULL) | |
624 | if (a->ops->get_stats(skb, a) < 0) | |
625 | goto errout; | |
626 | ||
e9ce1cd3 | 627 | if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 || |
d250a5f9 ED |
628 | gnet_stats_copy_rate_est(&d, &h->tcf_bstats, |
629 | &h->tcf_rate_est) < 0 || | |
e9ce1cd3 | 630 | gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0) |
1da177e4 LT |
631 | goto errout; |
632 | ||
633 | if (gnet_stats_finish_copy(&d) < 0) | |
634 | goto errout; | |
635 | ||
636 | return 0; | |
637 | ||
638 | errout: | |
639 | return -1; | |
640 | } | |
641 | ||
642 | static int | |
643 | tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq, | |
10297b99 | 644 | u16 flags, int event, int bind, int ref) |
1da177e4 LT |
645 | { |
646 | struct tcamsg *t; | |
647 | struct nlmsghdr *nlh; | |
27a884dc | 648 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 649 | struct nlattr *nest; |
1da177e4 | 650 | |
e431b8c0 JHS |
651 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
652 | ||
1da177e4 LT |
653 | t = NLMSG_DATA(nlh); |
654 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
655 | t->tca__pad1 = 0; |
656 | t->tca__pad2 = 0; | |
10297b99 | 657 | |
4b3550ef PM |
658 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
659 | if (nest == NULL) | |
660 | goto nla_put_failure; | |
1da177e4 LT |
661 | |
662 | if (tcf_action_dump(skb, a, bind, ref) < 0) | |
7ba699c6 | 663 | goto nla_put_failure; |
1da177e4 | 664 | |
4b3550ef | 665 | nla_nest_end(skb, nest); |
10297b99 | 666 | |
27a884dc | 667 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
668 | return skb->len; |
669 | ||
7ba699c6 | 670 | nla_put_failure: |
1da177e4 | 671 | nlmsg_failure: |
dc5fc579 | 672 | nlmsg_trim(skb, b); |
1da177e4 LT |
673 | return -1; |
674 | } | |
675 | ||
676 | static int | |
7316ae88 TG |
677 | act_get_notify(struct net *net, u32 pid, struct nlmsghdr *n, |
678 | struct tc_action *a, int event) | |
1da177e4 LT |
679 | { |
680 | struct sk_buff *skb; | |
1da177e4 LT |
681 | |
682 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
683 | if (!skb) | |
684 | return -ENOBUFS; | |
685 | if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { | |
686 | kfree_skb(skb); | |
687 | return -EINVAL; | |
688 | } | |
2942e900 | 689 | |
7316ae88 | 690 | return rtnl_unicast(skb, net, pid); |
1da177e4 LT |
691 | } |
692 | ||
693 | static struct tc_action * | |
ab27cfb8 | 694 | tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid) |
1da177e4 | 695 | { |
cc7ec456 | 696 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
1da177e4 LT |
697 | struct tc_action *a; |
698 | int index; | |
ab27cfb8 | 699 | int err; |
1da177e4 | 700 | |
cee63723 PM |
701 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
702 | if (err < 0) | |
ab27cfb8 | 703 | goto err_out; |
1da177e4 | 704 | |
cee63723 | 705 | err = -EINVAL; |
7ba699c6 PM |
706 | if (tb[TCA_ACT_INDEX] == NULL || |
707 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) | |
ab27cfb8 | 708 | goto err_out; |
1587bac4 | 709 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 710 | |
ab27cfb8 | 711 | err = -ENOMEM; |
0da974f4 | 712 | a = kzalloc(sizeof(struct tc_action), GFP_KERNEL); |
1da177e4 | 713 | if (a == NULL) |
ab27cfb8 | 714 | goto err_out; |
1da177e4 | 715 | |
ab27cfb8 | 716 | err = -EINVAL; |
7ba699c6 | 717 | a->ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
1da177e4 LT |
718 | if (a->ops == NULL) |
719 | goto err_free; | |
720 | if (a->ops->lookup == NULL) | |
721 | goto err_mod; | |
ab27cfb8 | 722 | err = -ENOENT; |
1da177e4 LT |
723 | if (a->ops->lookup(a, index) == 0) |
724 | goto err_mod; | |
725 | ||
726 | module_put(a->ops->owner); | |
1da177e4 | 727 | return a; |
ab27cfb8 | 728 | |
1da177e4 LT |
729 | err_mod: |
730 | module_put(a->ops->owner); | |
731 | err_free: | |
732 | kfree(a); | |
ab27cfb8 PM |
733 | err_out: |
734 | return ERR_PTR(err); | |
1da177e4 LT |
735 | } |
736 | ||
737 | static void cleanup_a(struct tc_action *act) | |
738 | { | |
739 | struct tc_action *a; | |
740 | ||
741 | for (a = act; a; a = act) { | |
742 | act = a->next; | |
743 | kfree(a); | |
744 | } | |
745 | } | |
746 | ||
747 | static struct tc_action *create_a(int i) | |
748 | { | |
749 | struct tc_action *act; | |
750 | ||
0da974f4 | 751 | act = kzalloc(sizeof(*act), GFP_KERNEL); |
1da177e4 | 752 | if (act == NULL) { |
6ff9c364 | 753 | pr_debug("create_a: failed to alloc!\n"); |
1da177e4 LT |
754 | return NULL; |
755 | } | |
1da177e4 LT |
756 | act->order = i; |
757 | return act; | |
758 | } | |
759 | ||
7316ae88 TG |
760 | static int tca_action_flush(struct net *net, struct nlattr *nla, |
761 | struct nlmsghdr *n, u32 pid) | |
1da177e4 LT |
762 | { |
763 | struct sk_buff *skb; | |
764 | unsigned char *b; | |
765 | struct nlmsghdr *nlh; | |
766 | struct tcamsg *t; | |
767 | struct netlink_callback dcb; | |
4b3550ef | 768 | struct nlattr *nest; |
cc7ec456 | 769 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 770 | struct nlattr *kind; |
1da177e4 | 771 | struct tc_action *a = create_a(0); |
36723873 | 772 | int err = -ENOMEM; |
1da177e4 LT |
773 | |
774 | if (a == NULL) { | |
6ff9c364 | 775 | pr_debug("tca_action_flush: couldnt create tc_action\n"); |
1da177e4 LT |
776 | return err; |
777 | } | |
778 | ||
779 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
780 | if (!skb) { | |
6ff9c364 | 781 | pr_debug("tca_action_flush: failed skb alloc\n"); |
1da177e4 | 782 | kfree(a); |
36723873 | 783 | return err; |
1da177e4 LT |
784 | } |
785 | ||
27a884dc | 786 | b = skb_tail_pointer(skb); |
1da177e4 | 787 | |
cee63723 PM |
788 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
789 | if (err < 0) | |
1da177e4 LT |
790 | goto err_out; |
791 | ||
cee63723 | 792 | err = -EINVAL; |
7ba699c6 | 793 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
794 | a->ops = tc_lookup_action(kind); |
795 | if (a->ops == NULL) | |
796 | goto err_out; | |
797 | ||
798 | nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t)); | |
799 | t = NLMSG_DATA(nlh); | |
800 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
801 | t->tca__pad1 = 0; |
802 | t->tca__pad2 = 0; | |
1da177e4 | 803 | |
4b3550ef PM |
804 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
805 | if (nest == NULL) | |
806 | goto nla_put_failure; | |
1da177e4 LT |
807 | |
808 | err = a->ops->walk(skb, &dcb, RTM_DELACTION, a); | |
809 | if (err < 0) | |
7ba699c6 | 810 | goto nla_put_failure; |
f97017cd JHS |
811 | if (err == 0) |
812 | goto noflush_out; | |
1da177e4 | 813 | |
4b3550ef | 814 | nla_nest_end(skb, nest); |
1da177e4 | 815 | |
27a884dc | 816 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
817 | nlh->nlmsg_flags |= NLM_F_ROOT; |
818 | module_put(a->ops->owner); | |
819 | kfree(a); | |
cc7ec456 ED |
820 | err = rtnetlink_send(skb, net, pid, RTNLGRP_TC, |
821 | n->nlmsg_flags & NLM_F_ECHO); | |
1da177e4 LT |
822 | if (err > 0) |
823 | return 0; | |
824 | ||
825 | return err; | |
826 | ||
7ba699c6 | 827 | nla_put_failure: |
1da177e4 | 828 | nlmsg_failure: |
ebbaeab1 | 829 | module_put(a->ops->owner); |
1da177e4 | 830 | err_out: |
f97017cd | 831 | noflush_out: |
1da177e4 LT |
832 | kfree_skb(skb); |
833 | kfree(a); | |
834 | return err; | |
835 | } | |
836 | ||
837 | static int | |
7316ae88 TG |
838 | tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
839 | u32 pid, int event) | |
1da177e4 | 840 | { |
cee63723 | 841 | int i, ret; |
cc7ec456 | 842 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
1da177e4 LT |
843 | struct tc_action *head = NULL, *act, *act_prev = NULL; |
844 | ||
cee63723 PM |
845 | ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
846 | if (ret < 0) | |
847 | return ret; | |
1da177e4 | 848 | |
cc7ec456 | 849 | if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) { |
f97017cd | 850 | if (tb[1] != NULL) |
7316ae88 | 851 | return tca_action_flush(net, tb[1], n, pid); |
f97017cd JHS |
852 | else |
853 | return -EINVAL; | |
1da177e4 LT |
854 | } |
855 | ||
7ba699c6 | 856 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
ab27cfb8 PM |
857 | act = tcf_action_get_1(tb[i], n, pid); |
858 | if (IS_ERR(act)) { | |
859 | ret = PTR_ERR(act); | |
1da177e4 | 860 | goto err; |
ab27cfb8 | 861 | } |
7ba699c6 | 862 | act->order = i; |
1da177e4 LT |
863 | |
864 | if (head == NULL) | |
865 | head = act; | |
866 | else | |
867 | act_prev->next = act; | |
868 | act_prev = act; | |
869 | } | |
870 | ||
871 | if (event == RTM_GETACTION) | |
7316ae88 | 872 | ret = act_get_notify(net, pid, n, head, event); |
1da177e4 LT |
873 | else { /* delete */ |
874 | struct sk_buff *skb; | |
875 | ||
876 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
877 | if (!skb) { | |
878 | ret = -ENOBUFS; | |
879 | goto err; | |
880 | } | |
881 | ||
882 | if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event, | |
10297b99 | 883 | 0, 1) <= 0) { |
1da177e4 LT |
884 | kfree_skb(skb); |
885 | ret = -EINVAL; | |
886 | goto err; | |
887 | } | |
888 | ||
889 | /* now do the delete */ | |
890 | tcf_action_destroy(head, 0); | |
7316ae88 | 891 | ret = rtnetlink_send(skb, net, pid, RTNLGRP_TC, |
cc7ec456 | 892 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
893 | if (ret > 0) |
894 | return 0; | |
895 | return ret; | |
896 | } | |
897 | err: | |
898 | cleanup_a(head); | |
899 | return ret; | |
900 | } | |
901 | ||
7316ae88 TG |
902 | static int tcf_add_notify(struct net *net, struct tc_action *a, |
903 | u32 pid, u32 seq, int event, u16 flags) | |
1da177e4 LT |
904 | { |
905 | struct tcamsg *t; | |
906 | struct nlmsghdr *nlh; | |
907 | struct sk_buff *skb; | |
4b3550ef | 908 | struct nlattr *nest; |
1da177e4 LT |
909 | unsigned char *b; |
910 | int err = 0; | |
911 | ||
912 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
913 | if (!skb) | |
914 | return -ENOBUFS; | |
915 | ||
27a884dc | 916 | b = skb_tail_pointer(skb); |
1da177e4 | 917 | |
e431b8c0 | 918 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
1da177e4 LT |
919 | t = NLMSG_DATA(nlh); |
920 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
921 | t->tca__pad1 = 0; |
922 | t->tca__pad2 = 0; | |
923 | ||
4b3550ef PM |
924 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
925 | if (nest == NULL) | |
926 | goto nla_put_failure; | |
1da177e4 LT |
927 | |
928 | if (tcf_action_dump(skb, a, 0, 0) < 0) | |
7ba699c6 | 929 | goto nla_put_failure; |
1da177e4 | 930 | |
4b3550ef | 931 | nla_nest_end(skb, nest); |
10297b99 | 932 | |
27a884dc | 933 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
ac6d439d | 934 | NETLINK_CB(skb).dst_group = RTNLGRP_TC; |
10297b99 | 935 | |
cc7ec456 | 936 | err = rtnetlink_send(skb, net, pid, RTNLGRP_TC, flags & NLM_F_ECHO); |
1da177e4 LT |
937 | if (err > 0) |
938 | err = 0; | |
939 | return err; | |
940 | ||
7ba699c6 | 941 | nla_put_failure: |
1da177e4 | 942 | nlmsg_failure: |
f6e57464 | 943 | kfree_skb(skb); |
1da177e4 LT |
944 | return -1; |
945 | } | |
946 | ||
10297b99 | 947 | |
1da177e4 | 948 | static int |
7316ae88 TG |
949 | tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
950 | u32 pid, int ovr) | |
1da177e4 LT |
951 | { |
952 | int ret = 0; | |
953 | struct tc_action *act; | |
954 | struct tc_action *a; | |
955 | u32 seq = n->nlmsg_seq; | |
956 | ||
ab27cfb8 | 957 | act = tcf_action_init(nla, NULL, NULL, ovr, 0); |
1da177e4 LT |
958 | if (act == NULL) |
959 | goto done; | |
ab27cfb8 PM |
960 | if (IS_ERR(act)) { |
961 | ret = PTR_ERR(act); | |
962 | goto done; | |
963 | } | |
1da177e4 LT |
964 | |
965 | /* dump then free all the actions after update; inserted policy | |
966 | * stays intact | |
cc7ec456 | 967 | */ |
7316ae88 | 968 | ret = tcf_add_notify(net, act, pid, seq, RTM_NEWACTION, n->nlmsg_flags); |
1da177e4 LT |
969 | for (a = act; a; a = act) { |
970 | act = a->next; | |
971 | kfree(a); | |
972 | } | |
973 | done: | |
974 | return ret; | |
975 | } | |
976 | ||
977 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
978 | { | |
3b1e0a65 | 979 | struct net *net = sock_net(skb->sk); |
7ba699c6 | 980 | struct nlattr *tca[TCA_ACT_MAX + 1]; |
1da177e4 LT |
981 | u32 pid = skb ? NETLINK_CB(skb).pid : 0; |
982 | int ret = 0, ovr = 0; | |
983 | ||
7ba699c6 PM |
984 | ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL); |
985 | if (ret < 0) | |
986 | return ret; | |
987 | ||
988 | if (tca[TCA_ACT_TAB] == NULL) { | |
6ff9c364 | 989 | pr_notice("tc_ctl_action: received NO action attribs\n"); |
1da177e4 LT |
990 | return -EINVAL; |
991 | } | |
992 | ||
cc7ec456 | 993 | /* n->nlmsg_flags & NLM_F_CREATE */ |
1da177e4 LT |
994 | switch (n->nlmsg_type) { |
995 | case RTM_NEWACTION: | |
996 | /* we are going to assume all other flags | |
25985edc | 997 | * imply create only if it doesn't exist |
1da177e4 LT |
998 | * Note that CREATE | EXCL implies that |
999 | * but since we want avoid ambiguity (eg when flags | |
1000 | * is zero) then just set this | |
1001 | */ | |
cc7ec456 | 1002 | if (n->nlmsg_flags & NLM_F_REPLACE) |
1da177e4 LT |
1003 | ovr = 1; |
1004 | replay: | |
7316ae88 | 1005 | ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, pid, ovr); |
1da177e4 LT |
1006 | if (ret == -EAGAIN) |
1007 | goto replay; | |
1008 | break; | |
1009 | case RTM_DELACTION: | |
7316ae88 TG |
1010 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
1011 | pid, RTM_DELACTION); | |
1da177e4 LT |
1012 | break; |
1013 | case RTM_GETACTION: | |
7316ae88 TG |
1014 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
1015 | pid, RTM_GETACTION); | |
1da177e4 LT |
1016 | break; |
1017 | default: | |
1018 | BUG(); | |
1019 | } | |
1020 | ||
1021 | return ret; | |
1022 | } | |
1023 | ||
7ba699c6 | 1024 | static struct nlattr * |
3a6c2b41 | 1025 | find_dump_kind(const struct nlmsghdr *n) |
1da177e4 | 1026 | { |
cc7ec456 | 1027 | struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1]; |
7ba699c6 PM |
1028 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
1029 | struct nlattr *nla[TCAA_MAX + 1]; | |
1030 | struct nlattr *kind; | |
1da177e4 | 1031 | |
c96c9471 | 1032 | if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0) |
1da177e4 | 1033 | return NULL; |
7ba699c6 | 1034 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
1035 | if (tb1 == NULL) |
1036 | return NULL; | |
1037 | ||
7ba699c6 PM |
1038 | if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), |
1039 | NLMSG_ALIGN(nla_len(tb1)), NULL) < 0) | |
1da177e4 | 1040 | return NULL; |
1da177e4 | 1041 | |
6d834e04 PM |
1042 | if (tb[1] == NULL) |
1043 | return NULL; | |
1044 | if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]), | |
1045 | nla_len(tb[1]), NULL) < 0) | |
1da177e4 | 1046 | return NULL; |
7ba699c6 | 1047 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 1048 | |
26dab893 | 1049 | return kind; |
1da177e4 LT |
1050 | } |
1051 | ||
1052 | static int | |
1053 | tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) | |
1054 | { | |
1055 | struct nlmsghdr *nlh; | |
27a884dc | 1056 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1057 | struct nlattr *nest; |
1da177e4 LT |
1058 | struct tc_action_ops *a_o; |
1059 | struct tc_action a; | |
1060 | int ret = 0; | |
1061 | struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh); | |
7ba699c6 | 1062 | struct nlattr *kind = find_dump_kind(cb->nlh); |
1da177e4 LT |
1063 | |
1064 | if (kind == NULL) { | |
6ff9c364 | 1065 | pr_info("tc_dump_action: action bad kind\n"); |
1da177e4 LT |
1066 | return 0; |
1067 | } | |
1068 | ||
26dab893 | 1069 | a_o = tc_lookup_action(kind); |
cc7ec456 | 1070 | if (a_o == NULL) |
1da177e4 | 1071 | return 0; |
1da177e4 LT |
1072 | |
1073 | memset(&a, 0, sizeof(struct tc_action)); | |
1074 | a.ops = a_o; | |
1075 | ||
1076 | if (a_o->walk == NULL) { | |
6ff9c364 | 1077 | WARN(1, "tc_dump_action: %s !capable of dumping table\n", |
1078 | a_o->kind); | |
7ba699c6 | 1079 | goto nla_put_failure; |
1da177e4 LT |
1080 | } |
1081 | ||
1082 | nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, | |
10297b99 | 1083 | cb->nlh->nlmsg_type, sizeof(*t)); |
1da177e4 LT |
1084 | t = NLMSG_DATA(nlh); |
1085 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
1086 | t->tca__pad1 = 0; |
1087 | t->tca__pad2 = 0; | |
1da177e4 | 1088 | |
4b3550ef PM |
1089 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
1090 | if (nest == NULL) | |
1091 | goto nla_put_failure; | |
1da177e4 LT |
1092 | |
1093 | ret = a_o->walk(skb, cb, RTM_GETACTION, &a); | |
1094 | if (ret < 0) | |
7ba699c6 | 1095 | goto nla_put_failure; |
1da177e4 LT |
1096 | |
1097 | if (ret > 0) { | |
4b3550ef | 1098 | nla_nest_end(skb, nest); |
1da177e4 LT |
1099 | ret = skb->len; |
1100 | } else | |
4b3550ef | 1101 | nla_nest_cancel(skb, nest); |
1da177e4 | 1102 | |
27a884dc | 1103 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1104 | if (NETLINK_CB(cb->skb).pid && ret) |
1105 | nlh->nlmsg_flags |= NLM_F_MULTI; | |
1106 | module_put(a_o->owner); | |
1107 | return skb->len; | |
1108 | ||
7ba699c6 | 1109 | nla_put_failure: |
1da177e4 LT |
1110 | nlmsg_failure: |
1111 | module_put(a_o->owner); | |
dc5fc579 | 1112 | nlmsg_trim(skb, b); |
1da177e4 LT |
1113 | return skb->len; |
1114 | } | |
1115 | ||
1116 | static int __init tc_action_init(void) | |
1117 | { | |
c7ac8679 GR |
1118 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL); |
1119 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL); | |
1120 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, | |
1121 | NULL); | |
1da177e4 | 1122 | |
1da177e4 LT |
1123 | return 0; |
1124 | } | |
1125 | ||
1126 | subsys_initcall(tc_action_init); |