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 | ||
0e991ec6 SH |
217 | struct tcf_common *tcf_hash_create(u32 index, struct nlattr *est, |
218 | struct tc_action *a, int size, int bind, | |
219 | u32 *idx_gen, struct tcf_hashinfo *hinfo) | |
e9ce1cd3 DM |
220 | { |
221 | struct tcf_common *p = kzalloc(size, GFP_KERNEL); | |
222 | ||
223 | if (unlikely(!p)) | |
0e991ec6 | 224 | return ERR_PTR(-ENOMEM); |
e9ce1cd3 DM |
225 | p->tcfc_refcnt = 1; |
226 | if (bind) | |
227 | p->tcfc_bindcnt = 1; | |
228 | ||
229 | spin_lock_init(&p->tcfc_lock); | |
e9ce1cd3 DM |
230 | p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo); |
231 | p->tcfc_tm.install = jiffies; | |
232 | p->tcfc_tm.lastuse = jiffies; | |
0e991ec6 SH |
233 | if (est) { |
234 | int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est, | |
235 | &p->tcfc_lock, est); | |
236 | if (err) { | |
237 | kfree(p); | |
238 | return ERR_PTR(err); | |
239 | } | |
240 | } | |
241 | ||
e9ce1cd3 DM |
242 | a->priv = (void *) p; |
243 | return p; | |
244 | } | |
245 | EXPORT_SYMBOL(tcf_hash_create); | |
246 | ||
247 | void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo) | |
248 | { | |
249 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); | |
250 | ||
251 | write_lock_bh(hinfo->lock); | |
252 | p->tcfc_next = hinfo->htab[h]; | |
253 | hinfo->htab[h] = p; | |
254 | write_unlock_bh(hinfo->lock); | |
255 | } | |
256 | EXPORT_SYMBOL(tcf_hash_insert); | |
1da177e4 LT |
257 | |
258 | static struct tc_action_ops *act_base = NULL; | |
259 | static DEFINE_RWLOCK(act_mod_lock); | |
260 | ||
261 | int tcf_register_action(struct tc_action_ops *act) | |
262 | { | |
263 | struct tc_action_ops *a, **ap; | |
264 | ||
265 | write_lock(&act_mod_lock); | |
266 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) { | |
267 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { | |
268 | write_unlock(&act_mod_lock); | |
269 | return -EEXIST; | |
270 | } | |
271 | } | |
272 | act->next = NULL; | |
273 | *ap = act; | |
274 | write_unlock(&act_mod_lock); | |
275 | return 0; | |
276 | } | |
62e3ba1b | 277 | EXPORT_SYMBOL(tcf_register_action); |
1da177e4 LT |
278 | |
279 | int tcf_unregister_action(struct tc_action_ops *act) | |
280 | { | |
281 | struct tc_action_ops *a, **ap; | |
282 | int err = -ENOENT; | |
283 | ||
284 | write_lock(&act_mod_lock); | |
285 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) | |
286 | if (a == act) | |
287 | break; | |
288 | if (a) { | |
289 | *ap = a->next; | |
290 | a->next = NULL; | |
291 | err = 0; | |
292 | } | |
293 | write_unlock(&act_mod_lock); | |
294 | return err; | |
295 | } | |
62e3ba1b | 296 | EXPORT_SYMBOL(tcf_unregister_action); |
1da177e4 LT |
297 | |
298 | /* lookup by name */ | |
299 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
300 | { | |
301 | struct tc_action_ops *a = NULL; | |
302 | ||
303 | if (kind) { | |
304 | read_lock(&act_mod_lock); | |
305 | for (a = act_base; a; a = a->next) { | |
306 | if (strcmp(kind, a->kind) == 0) { | |
307 | if (!try_module_get(a->owner)) { | |
308 | read_unlock(&act_mod_lock); | |
309 | return NULL; | |
310 | } | |
311 | break; | |
312 | } | |
313 | } | |
314 | read_unlock(&act_mod_lock); | |
315 | } | |
316 | return a; | |
317 | } | |
318 | ||
7ba699c6 PM |
319 | /* lookup by nlattr */ |
320 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) | |
1da177e4 LT |
321 | { |
322 | struct tc_action_ops *a = NULL; | |
323 | ||
324 | if (kind) { | |
325 | read_lock(&act_mod_lock); | |
326 | for (a = act_base; a; a = a->next) { | |
7ba699c6 | 327 | if (nla_strcmp(kind, a->kind) == 0) { |
1da177e4 LT |
328 | if (!try_module_get(a->owner)) { |
329 | read_unlock(&act_mod_lock); | |
330 | return NULL; | |
331 | } | |
332 | break; | |
333 | } | |
334 | } | |
335 | read_unlock(&act_mod_lock); | |
336 | } | |
337 | return a; | |
338 | } | |
339 | ||
340 | #if 0 | |
341 | /* lookup by id */ | |
342 | static struct tc_action_ops *tc_lookup_action_id(u32 type) | |
343 | { | |
344 | struct tc_action_ops *a = NULL; | |
345 | ||
346 | if (type) { | |
347 | read_lock(&act_mod_lock); | |
348 | for (a = act_base; a; a = a->next) { | |
349 | if (a->type == type) { | |
350 | if (!try_module_get(a->owner)) { | |
351 | read_unlock(&act_mod_lock); | |
352 | return NULL; | |
353 | } | |
354 | break; | |
355 | } | |
356 | } | |
357 | read_unlock(&act_mod_lock); | |
358 | } | |
359 | return a; | |
360 | } | |
361 | #endif | |
362 | ||
363 | int tcf_action_exec(struct sk_buff *skb, struct tc_action *act, | |
10297b99 | 364 | struct tcf_result *res) |
1da177e4 LT |
365 | { |
366 | struct tc_action *a; | |
367 | int ret = -1; | |
368 | ||
369 | if (skb->tc_verd & TC_NCLS) { | |
370 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
1da177e4 LT |
371 | ret = TC_ACT_OK; |
372 | goto exec_done; | |
373 | } | |
374 | while ((a = act) != NULL) { | |
375 | repeat: | |
376 | if (a->ops && a->ops->act) { | |
f43c5a0d | 377 | ret = a->ops->act(skb, a, res); |
1da177e4 LT |
378 | if (TC_MUNGED & skb->tc_verd) { |
379 | /* copied already, allow trampling */ | |
380 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); | |
381 | skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd); | |
382 | } | |
1da177e4 LT |
383 | if (ret == TC_ACT_REPEAT) |
384 | goto repeat; /* we need a ttl - JHS */ | |
14d50e78 HS |
385 | if (ret != TC_ACT_PIPE) |
386 | goto exec_done; | |
1da177e4 LT |
387 | } |
388 | act = a->next; | |
389 | } | |
390 | exec_done: | |
1da177e4 LT |
391 | return ret; |
392 | } | |
62e3ba1b | 393 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 LT |
394 | |
395 | void tcf_action_destroy(struct tc_action *act, int bind) | |
396 | { | |
397 | struct tc_action *a; | |
398 | ||
399 | for (a = act; a; a = act) { | |
400 | if (a->ops && a->ops->cleanup) { | |
1da177e4 LT |
401 | if (a->ops->cleanup(a, bind) == ACT_P_DELETED) |
402 | module_put(a->ops->owner); | |
403 | act = act->next; | |
404 | kfree(a); | |
405 | } else { /*FIXME: Remove later - catch insertion bugs*/ | |
406 | printk("tcf_action_destroy: BUG? destroying NULL ops\n"); | |
407 | act = act->next; | |
408 | kfree(a); | |
409 | } | |
410 | } | |
411 | } | |
412 | ||
413 | int | |
414 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
415 | { | |
416 | int err = -EINVAL; | |
417 | ||
418 | if (a->ops == NULL || a->ops->dump == NULL) | |
419 | return err; | |
420 | return a->ops->dump(skb, a, bind, ref); | |
421 | } | |
422 | ||
423 | int | |
424 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
425 | { | |
426 | int err = -EINVAL; | |
27a884dc | 427 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 428 | struct nlattr *nest; |
1da177e4 LT |
429 | |
430 | if (a->ops == NULL || a->ops->dump == NULL) | |
431 | return err; | |
432 | ||
57e1c487 | 433 | NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind); |
1da177e4 | 434 | if (tcf_action_copy_stats(skb, a, 0)) |
7ba699c6 | 435 | goto nla_put_failure; |
4b3550ef PM |
436 | nest = nla_nest_start(skb, TCA_OPTIONS); |
437 | if (nest == NULL) | |
438 | goto nla_put_failure; | |
1da177e4 | 439 | if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) { |
4b3550ef | 440 | nla_nest_end(skb, nest); |
1da177e4 LT |
441 | return err; |
442 | } | |
443 | ||
7ba699c6 | 444 | nla_put_failure: |
dc5fc579 | 445 | nlmsg_trim(skb, b); |
1da177e4 LT |
446 | return -1; |
447 | } | |
62e3ba1b | 448 | EXPORT_SYMBOL(tcf_action_dump_1); |
1da177e4 LT |
449 | |
450 | int | |
451 | tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref) | |
452 | { | |
453 | struct tc_action *a; | |
454 | int err = -EINVAL; | |
4b3550ef | 455 | struct nlattr *nest; |
1da177e4 LT |
456 | |
457 | while ((a = act) != NULL) { | |
1da177e4 | 458 | act = a->next; |
4b3550ef PM |
459 | nest = nla_nest_start(skb, a->order); |
460 | if (nest == NULL) | |
461 | goto nla_put_failure; | |
1da177e4 LT |
462 | err = tcf_action_dump_1(skb, a, bind, ref); |
463 | if (err < 0) | |
4fe683f5 | 464 | goto errout; |
4b3550ef | 465 | nla_nest_end(skb, nest); |
1da177e4 LT |
466 | } |
467 | ||
468 | return 0; | |
469 | ||
7ba699c6 | 470 | nla_put_failure: |
4fe683f5 TG |
471 | err = -EINVAL; |
472 | errout: | |
4b3550ef | 473 | nla_nest_cancel(skb, nest); |
4fe683f5 | 474 | return err; |
1da177e4 LT |
475 | } |
476 | ||
7ba699c6 | 477 | struct tc_action *tcf_action_init_1(struct nlattr *nla, struct nlattr *est, |
ab27cfb8 | 478 | char *name, int ovr, int bind) |
1da177e4 LT |
479 | { |
480 | struct tc_action *a; | |
481 | struct tc_action_ops *a_o; | |
482 | char act_name[IFNAMSIZ]; | |
7ba699c6 PM |
483 | struct nlattr *tb[TCA_ACT_MAX+1]; |
484 | struct nlattr *kind; | |
ab27cfb8 | 485 | int err; |
1da177e4 | 486 | |
1da177e4 | 487 | if (name == NULL) { |
cee63723 PM |
488 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
489 | if (err < 0) | |
1da177e4 | 490 | goto err_out; |
cee63723 | 491 | err = -EINVAL; |
7ba699c6 | 492 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
493 | if (kind == NULL) |
494 | goto err_out; | |
7ba699c6 | 495 | if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) |
1da177e4 LT |
496 | goto err_out; |
497 | } else { | |
cee63723 | 498 | err = -EINVAL; |
1da177e4 LT |
499 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) |
500 | goto err_out; | |
501 | } | |
502 | ||
503 | a_o = tc_lookup_action_n(act_name); | |
504 | if (a_o == NULL) { | |
95a5afca | 505 | #ifdef CONFIG_MODULES |
1da177e4 | 506 | rtnl_unlock(); |
4bba3925 | 507 | request_module("act_%s", act_name); |
1da177e4 LT |
508 | rtnl_lock(); |
509 | ||
510 | a_o = tc_lookup_action_n(act_name); | |
511 | ||
512 | /* We dropped the RTNL semaphore in order to | |
513 | * perform the module load. So, even if we | |
514 | * succeeded in loading the module we have to | |
515 | * tell the caller to replay the request. We | |
516 | * indicate this using -EAGAIN. | |
517 | */ | |
518 | if (a_o != NULL) { | |
ab27cfb8 | 519 | err = -EAGAIN; |
1da177e4 LT |
520 | goto err_mod; |
521 | } | |
522 | #endif | |
ab27cfb8 | 523 | err = -ENOENT; |
1da177e4 LT |
524 | goto err_out; |
525 | } | |
526 | ||
ab27cfb8 | 527 | err = -ENOMEM; |
0da974f4 | 528 | a = kzalloc(sizeof(*a), GFP_KERNEL); |
1da177e4 LT |
529 | if (a == NULL) |
530 | goto err_mod; | |
1da177e4 LT |
531 | |
532 | /* backward compatibility for policer */ | |
533 | if (name == NULL) | |
ab27cfb8 | 534 | err = a_o->init(tb[TCA_ACT_OPTIONS], est, a, ovr, bind); |
1da177e4 | 535 | else |
ab27cfb8 PM |
536 | err = a_o->init(nla, est, a, ovr, bind); |
537 | if (err < 0) | |
1da177e4 LT |
538 | goto err_free; |
539 | ||
540 | /* module count goes up only when brand new policy is created | |
541 | if it exists and is only bound to in a_o->init() then | |
542 | ACT_P_CREATED is not returned (a zero is). | |
543 | */ | |
ab27cfb8 | 544 | if (err != ACT_P_CREATED) |
1da177e4 LT |
545 | module_put(a_o->owner); |
546 | a->ops = a_o; | |
1da177e4 | 547 | |
1da177e4 LT |
548 | return a; |
549 | ||
550 | err_free: | |
551 | kfree(a); | |
552 | err_mod: | |
553 | module_put(a_o->owner); | |
554 | err_out: | |
ab27cfb8 | 555 | return ERR_PTR(err); |
1da177e4 LT |
556 | } |
557 | ||
7ba699c6 | 558 | struct tc_action *tcf_action_init(struct nlattr *nla, struct nlattr *est, |
ab27cfb8 | 559 | char *name, int ovr, int bind) |
1da177e4 | 560 | { |
7ba699c6 | 561 | struct nlattr *tb[TCA_ACT_MAX_PRIO+1]; |
1da177e4 | 562 | struct tc_action *head = NULL, *act, *act_prev = NULL; |
cee63723 | 563 | int err; |
1da177e4 LT |
564 | int i; |
565 | ||
cee63723 PM |
566 | err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
567 | if (err < 0) | |
568 | return ERR_PTR(err); | |
1da177e4 | 569 | |
7ba699c6 | 570 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
ab27cfb8 PM |
571 | act = tcf_action_init_1(tb[i], est, name, ovr, bind); |
572 | if (IS_ERR(act)) | |
1da177e4 | 573 | goto err; |
7ba699c6 | 574 | act->order = i; |
1da177e4 LT |
575 | |
576 | if (head == NULL) | |
577 | head = act; | |
578 | else | |
579 | act_prev->next = act; | |
580 | act_prev = act; | |
581 | } | |
582 | return head; | |
583 | ||
584 | err: | |
585 | if (head != NULL) | |
586 | tcf_action_destroy(head, bind); | |
ab27cfb8 | 587 | return act; |
1da177e4 LT |
588 | } |
589 | ||
590 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a, | |
591 | int compat_mode) | |
592 | { | |
593 | int err = 0; | |
594 | struct gnet_dump d; | |
595 | struct tcf_act_hdr *h = a->priv; | |
10297b99 | 596 | |
1da177e4 LT |
597 | if (h == NULL) |
598 | goto errout; | |
599 | ||
600 | /* compat_mode being true specifies a call that is supposed | |
601 | * to add additional backward compatiblity statistic TLVs. | |
602 | */ | |
603 | if (compat_mode) { | |
604 | if (a->type == TCA_OLD_COMPAT) | |
605 | err = gnet_stats_start_copy_compat(skb, 0, | |
4bdf3991 | 606 | TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d); |
1da177e4 LT |
607 | else |
608 | return 0; | |
609 | } else | |
610 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
4bdf3991 | 611 | &h->tcf_lock, &d); |
1da177e4 LT |
612 | |
613 | if (err < 0) | |
614 | goto errout; | |
615 | ||
616 | if (a->ops != NULL && a->ops->get_stats != NULL) | |
617 | if (a->ops->get_stats(skb, a) < 0) | |
618 | goto errout; | |
619 | ||
e9ce1cd3 | 620 | if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 || |
e9ce1cd3 | 621 | gnet_stats_copy_rate_est(&d, &h->tcf_rate_est) < 0 || |
e9ce1cd3 | 622 | gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0) |
1da177e4 LT |
623 | goto errout; |
624 | ||
625 | if (gnet_stats_finish_copy(&d) < 0) | |
626 | goto errout; | |
627 | ||
628 | return 0; | |
629 | ||
630 | errout: | |
631 | return -1; | |
632 | } | |
633 | ||
634 | static int | |
635 | tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq, | |
10297b99 | 636 | u16 flags, int event, int bind, int ref) |
1da177e4 LT |
637 | { |
638 | struct tcamsg *t; | |
639 | struct nlmsghdr *nlh; | |
27a884dc | 640 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 641 | struct nlattr *nest; |
1da177e4 | 642 | |
e431b8c0 JHS |
643 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
644 | ||
1da177e4 LT |
645 | t = NLMSG_DATA(nlh); |
646 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
647 | t->tca__pad1 = 0; |
648 | t->tca__pad2 = 0; | |
10297b99 | 649 | |
4b3550ef PM |
650 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
651 | if (nest == NULL) | |
652 | goto nla_put_failure; | |
1da177e4 LT |
653 | |
654 | if (tcf_action_dump(skb, a, bind, ref) < 0) | |
7ba699c6 | 655 | goto nla_put_failure; |
1da177e4 | 656 | |
4b3550ef | 657 | nla_nest_end(skb, nest); |
10297b99 | 658 | |
27a884dc | 659 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
660 | return skb->len; |
661 | ||
7ba699c6 | 662 | nla_put_failure: |
1da177e4 | 663 | nlmsg_failure: |
dc5fc579 | 664 | nlmsg_trim(skb, b); |
1da177e4 LT |
665 | return -1; |
666 | } | |
667 | ||
668 | static int | |
669 | act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event) | |
670 | { | |
671 | struct sk_buff *skb; | |
1da177e4 LT |
672 | |
673 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
674 | if (!skb) | |
675 | return -ENOBUFS; | |
676 | if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { | |
677 | kfree_skb(skb); | |
678 | return -EINVAL; | |
679 | } | |
2942e900 | 680 | |
97c53cac | 681 | return rtnl_unicast(skb, &init_net, pid); |
1da177e4 LT |
682 | } |
683 | ||
684 | static struct tc_action * | |
ab27cfb8 | 685 | tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid) |
1da177e4 | 686 | { |
7ba699c6 | 687 | struct nlattr *tb[TCA_ACT_MAX+1]; |
1da177e4 LT |
688 | struct tc_action *a; |
689 | int index; | |
ab27cfb8 | 690 | int err; |
1da177e4 | 691 | |
cee63723 PM |
692 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
693 | if (err < 0) | |
ab27cfb8 | 694 | goto err_out; |
1da177e4 | 695 | |
cee63723 | 696 | err = -EINVAL; |
7ba699c6 PM |
697 | if (tb[TCA_ACT_INDEX] == NULL || |
698 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) | |
ab27cfb8 | 699 | goto err_out; |
1587bac4 | 700 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 701 | |
ab27cfb8 | 702 | err = -ENOMEM; |
0da974f4 | 703 | a = kzalloc(sizeof(struct tc_action), GFP_KERNEL); |
1da177e4 | 704 | if (a == NULL) |
ab27cfb8 | 705 | goto err_out; |
1da177e4 | 706 | |
ab27cfb8 | 707 | err = -EINVAL; |
7ba699c6 | 708 | a->ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
1da177e4 LT |
709 | if (a->ops == NULL) |
710 | goto err_free; | |
711 | if (a->ops->lookup == NULL) | |
712 | goto err_mod; | |
ab27cfb8 | 713 | err = -ENOENT; |
1da177e4 LT |
714 | if (a->ops->lookup(a, index) == 0) |
715 | goto err_mod; | |
716 | ||
717 | module_put(a->ops->owner); | |
1da177e4 | 718 | return a; |
ab27cfb8 | 719 | |
1da177e4 LT |
720 | err_mod: |
721 | module_put(a->ops->owner); | |
722 | err_free: | |
723 | kfree(a); | |
ab27cfb8 PM |
724 | err_out: |
725 | return ERR_PTR(err); | |
1da177e4 LT |
726 | } |
727 | ||
728 | static void cleanup_a(struct tc_action *act) | |
729 | { | |
730 | struct tc_action *a; | |
731 | ||
732 | for (a = act; a; a = act) { | |
733 | act = a->next; | |
734 | kfree(a); | |
735 | } | |
736 | } | |
737 | ||
738 | static struct tc_action *create_a(int i) | |
739 | { | |
740 | struct tc_action *act; | |
741 | ||
0da974f4 | 742 | act = kzalloc(sizeof(*act), GFP_KERNEL); |
1da177e4 LT |
743 | if (act == NULL) { |
744 | printk("create_a: failed to alloc!\n"); | |
745 | return NULL; | |
746 | } | |
1da177e4 LT |
747 | act->order = i; |
748 | return act; | |
749 | } | |
750 | ||
7ba699c6 | 751 | static int tca_action_flush(struct nlattr *nla, struct nlmsghdr *n, u32 pid) |
1da177e4 LT |
752 | { |
753 | struct sk_buff *skb; | |
754 | unsigned char *b; | |
755 | struct nlmsghdr *nlh; | |
756 | struct tcamsg *t; | |
757 | struct netlink_callback dcb; | |
4b3550ef | 758 | struct nlattr *nest; |
7ba699c6 PM |
759 | struct nlattr *tb[TCA_ACT_MAX+1]; |
760 | struct nlattr *kind; | |
1da177e4 | 761 | struct tc_action *a = create_a(0); |
36723873 | 762 | int err = -ENOMEM; |
1da177e4 LT |
763 | |
764 | if (a == NULL) { | |
765 | printk("tca_action_flush: couldnt create tc_action\n"); | |
766 | return err; | |
767 | } | |
768 | ||
769 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
770 | if (!skb) { | |
771 | printk("tca_action_flush: failed skb alloc\n"); | |
772 | kfree(a); | |
36723873 | 773 | return err; |
1da177e4 LT |
774 | } |
775 | ||
27a884dc | 776 | b = skb_tail_pointer(skb); |
1da177e4 | 777 | |
cee63723 PM |
778 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
779 | if (err < 0) | |
1da177e4 LT |
780 | goto err_out; |
781 | ||
cee63723 | 782 | err = -EINVAL; |
7ba699c6 | 783 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
784 | a->ops = tc_lookup_action(kind); |
785 | if (a->ops == NULL) | |
786 | goto err_out; | |
787 | ||
788 | nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t)); | |
789 | t = NLMSG_DATA(nlh); | |
790 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
791 | t->tca__pad1 = 0; |
792 | t->tca__pad2 = 0; | |
1da177e4 | 793 | |
4b3550ef PM |
794 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
795 | if (nest == NULL) | |
796 | goto nla_put_failure; | |
1da177e4 LT |
797 | |
798 | err = a->ops->walk(skb, &dcb, RTM_DELACTION, a); | |
799 | if (err < 0) | |
7ba699c6 | 800 | goto nla_put_failure; |
f97017cd JHS |
801 | if (err == 0) |
802 | goto noflush_out; | |
1da177e4 | 803 | |
4b3550ef | 804 | nla_nest_end(skb, nest); |
1da177e4 | 805 | |
27a884dc | 806 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
807 | nlh->nlmsg_flags |= NLM_F_ROOT; |
808 | module_put(a->ops->owner); | |
809 | kfree(a); | |
97c53cac | 810 | err = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
811 | if (err > 0) |
812 | return 0; | |
813 | ||
814 | return err; | |
815 | ||
7ba699c6 | 816 | nla_put_failure: |
1da177e4 | 817 | nlmsg_failure: |
ebbaeab1 | 818 | module_put(a->ops->owner); |
1da177e4 | 819 | err_out: |
f97017cd | 820 | noflush_out: |
1da177e4 LT |
821 | kfree_skb(skb); |
822 | kfree(a); | |
823 | return err; | |
824 | } | |
825 | ||
826 | static int | |
7ba699c6 | 827 | tca_action_gd(struct nlattr *nla, struct nlmsghdr *n, u32 pid, int event) |
1da177e4 | 828 | { |
cee63723 | 829 | int i, ret; |
7ba699c6 | 830 | struct nlattr *tb[TCA_ACT_MAX_PRIO+1]; |
1da177e4 LT |
831 | struct tc_action *head = NULL, *act, *act_prev = NULL; |
832 | ||
cee63723 PM |
833 | ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
834 | if (ret < 0) | |
835 | return ret; | |
1da177e4 LT |
836 | |
837 | if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) { | |
f97017cd JHS |
838 | if (tb[1] != NULL) |
839 | return tca_action_flush(tb[1], n, pid); | |
840 | else | |
841 | return -EINVAL; | |
1da177e4 LT |
842 | } |
843 | ||
7ba699c6 | 844 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
ab27cfb8 PM |
845 | act = tcf_action_get_1(tb[i], n, pid); |
846 | if (IS_ERR(act)) { | |
847 | ret = PTR_ERR(act); | |
1da177e4 | 848 | goto err; |
ab27cfb8 | 849 | } |
7ba699c6 | 850 | act->order = i; |
1da177e4 LT |
851 | |
852 | if (head == NULL) | |
853 | head = act; | |
854 | else | |
855 | act_prev->next = act; | |
856 | act_prev = act; | |
857 | } | |
858 | ||
859 | if (event == RTM_GETACTION) | |
860 | ret = act_get_notify(pid, n, head, event); | |
861 | else { /* delete */ | |
862 | struct sk_buff *skb; | |
863 | ||
864 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
865 | if (!skb) { | |
866 | ret = -ENOBUFS; | |
867 | goto err; | |
868 | } | |
869 | ||
870 | if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event, | |
10297b99 | 871 | 0, 1) <= 0) { |
1da177e4 LT |
872 | kfree_skb(skb); |
873 | ret = -EINVAL; | |
874 | goto err; | |
875 | } | |
876 | ||
877 | /* now do the delete */ | |
878 | tcf_action_destroy(head, 0); | |
97c53cac | 879 | ret = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, |
10297b99 | 880 | n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
881 | if (ret > 0) |
882 | return 0; | |
883 | return ret; | |
884 | } | |
885 | err: | |
886 | cleanup_a(head); | |
887 | return ret; | |
888 | } | |
889 | ||
890 | static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event, | |
10297b99 | 891 | u16 flags) |
1da177e4 LT |
892 | { |
893 | struct tcamsg *t; | |
894 | struct nlmsghdr *nlh; | |
895 | struct sk_buff *skb; | |
4b3550ef | 896 | struct nlattr *nest; |
1da177e4 LT |
897 | unsigned char *b; |
898 | int err = 0; | |
899 | ||
900 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
901 | if (!skb) | |
902 | return -ENOBUFS; | |
903 | ||
27a884dc | 904 | b = skb_tail_pointer(skb); |
1da177e4 | 905 | |
e431b8c0 | 906 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
1da177e4 LT |
907 | t = NLMSG_DATA(nlh); |
908 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
909 | t->tca__pad1 = 0; |
910 | t->tca__pad2 = 0; | |
911 | ||
4b3550ef PM |
912 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
913 | if (nest == NULL) | |
914 | goto nla_put_failure; | |
1da177e4 LT |
915 | |
916 | if (tcf_action_dump(skb, a, 0, 0) < 0) | |
7ba699c6 | 917 | goto nla_put_failure; |
1da177e4 | 918 | |
4b3550ef | 919 | nla_nest_end(skb, nest); |
10297b99 | 920 | |
27a884dc | 921 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
ac6d439d | 922 | NETLINK_CB(skb).dst_group = RTNLGRP_TC; |
10297b99 | 923 | |
97c53cac | 924 | err = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, flags&NLM_F_ECHO); |
1da177e4 LT |
925 | if (err > 0) |
926 | err = 0; | |
927 | return err; | |
928 | ||
7ba699c6 | 929 | nla_put_failure: |
1da177e4 | 930 | nlmsg_failure: |
f6e57464 | 931 | kfree_skb(skb); |
1da177e4 LT |
932 | return -1; |
933 | } | |
934 | ||
10297b99 | 935 | |
1da177e4 | 936 | static int |
7ba699c6 | 937 | tcf_action_add(struct nlattr *nla, struct nlmsghdr *n, u32 pid, int ovr) |
1da177e4 LT |
938 | { |
939 | int ret = 0; | |
940 | struct tc_action *act; | |
941 | struct tc_action *a; | |
942 | u32 seq = n->nlmsg_seq; | |
943 | ||
ab27cfb8 | 944 | act = tcf_action_init(nla, NULL, NULL, ovr, 0); |
1da177e4 LT |
945 | if (act == NULL) |
946 | goto done; | |
ab27cfb8 PM |
947 | if (IS_ERR(act)) { |
948 | ret = PTR_ERR(act); | |
949 | goto done; | |
950 | } | |
1da177e4 LT |
951 | |
952 | /* dump then free all the actions after update; inserted policy | |
953 | * stays intact | |
954 | * */ | |
955 | ret = tcf_add_notify(act, pid, seq, RTM_NEWACTION, n->nlmsg_flags); | |
956 | for (a = act; a; a = act) { | |
957 | act = a->next; | |
958 | kfree(a); | |
959 | } | |
960 | done: | |
961 | return ret; | |
962 | } | |
963 | ||
964 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
965 | { | |
3b1e0a65 | 966 | struct net *net = sock_net(skb->sk); |
7ba699c6 | 967 | struct nlattr *tca[TCA_ACT_MAX + 1]; |
1da177e4 LT |
968 | u32 pid = skb ? NETLINK_CB(skb).pid : 0; |
969 | int ret = 0, ovr = 0; | |
970 | ||
b854272b DL |
971 | if (net != &init_net) |
972 | return -EINVAL; | |
973 | ||
7ba699c6 PM |
974 | ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL); |
975 | if (ret < 0) | |
976 | return ret; | |
977 | ||
978 | if (tca[TCA_ACT_TAB] == NULL) { | |
1da177e4 LT |
979 | printk("tc_ctl_action: received NO action attribs\n"); |
980 | return -EINVAL; | |
981 | } | |
982 | ||
983 | /* n->nlmsg_flags&NLM_F_CREATE | |
984 | * */ | |
985 | switch (n->nlmsg_type) { | |
986 | case RTM_NEWACTION: | |
987 | /* we are going to assume all other flags | |
988 | * imply create only if it doesnt exist | |
989 | * Note that CREATE | EXCL implies that | |
990 | * but since we want avoid ambiguity (eg when flags | |
991 | * is zero) then just set this | |
992 | */ | |
993 | if (n->nlmsg_flags&NLM_F_REPLACE) | |
994 | ovr = 1; | |
995 | replay: | |
7ba699c6 | 996 | ret = tcf_action_add(tca[TCA_ACT_TAB], n, pid, ovr); |
1da177e4 LT |
997 | if (ret == -EAGAIN) |
998 | goto replay; | |
999 | break; | |
1000 | case RTM_DELACTION: | |
7ba699c6 | 1001 | ret = tca_action_gd(tca[TCA_ACT_TAB], n, pid, RTM_DELACTION); |
1da177e4 LT |
1002 | break; |
1003 | case RTM_GETACTION: | |
7ba699c6 | 1004 | ret = tca_action_gd(tca[TCA_ACT_TAB], n, pid, RTM_GETACTION); |
1da177e4 LT |
1005 | break; |
1006 | default: | |
1007 | BUG(); | |
1008 | } | |
1009 | ||
1010 | return ret; | |
1011 | } | |
1012 | ||
7ba699c6 | 1013 | static struct nlattr * |
1da177e4 LT |
1014 | find_dump_kind(struct nlmsghdr *n) |
1015 | { | |
7ba699c6 PM |
1016 | struct nlattr *tb1, *tb2[TCA_ACT_MAX+1]; |
1017 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; | |
1018 | struct nlattr *nla[TCAA_MAX + 1]; | |
1019 | struct nlattr *kind; | |
1da177e4 | 1020 | |
c96c9471 | 1021 | if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0) |
1da177e4 | 1022 | return NULL; |
7ba699c6 | 1023 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
1024 | if (tb1 == NULL) |
1025 | return NULL; | |
1026 | ||
7ba699c6 PM |
1027 | if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), |
1028 | NLMSG_ALIGN(nla_len(tb1)), NULL) < 0) | |
1da177e4 | 1029 | return NULL; |
1da177e4 | 1030 | |
6d834e04 PM |
1031 | if (tb[1] == NULL) |
1032 | return NULL; | |
1033 | if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]), | |
1034 | nla_len(tb[1]), NULL) < 0) | |
1da177e4 | 1035 | return NULL; |
7ba699c6 | 1036 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 1037 | |
26dab893 | 1038 | return kind; |
1da177e4 LT |
1039 | } |
1040 | ||
1041 | static int | |
1042 | tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) | |
1043 | { | |
3b1e0a65 | 1044 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1045 | struct nlmsghdr *nlh; |
27a884dc | 1046 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1047 | struct nlattr *nest; |
1da177e4 LT |
1048 | struct tc_action_ops *a_o; |
1049 | struct tc_action a; | |
1050 | int ret = 0; | |
1051 | struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh); | |
7ba699c6 | 1052 | struct nlattr *kind = find_dump_kind(cb->nlh); |
1da177e4 | 1053 | |
b854272b DL |
1054 | if (net != &init_net) |
1055 | return 0; | |
1056 | ||
1da177e4 LT |
1057 | if (kind == NULL) { |
1058 | printk("tc_dump_action: action bad kind\n"); | |
1059 | return 0; | |
1060 | } | |
1061 | ||
26dab893 | 1062 | a_o = tc_lookup_action(kind); |
1da177e4 | 1063 | if (a_o == NULL) { |
1da177e4 LT |
1064 | return 0; |
1065 | } | |
1066 | ||
1067 | memset(&a, 0, sizeof(struct tc_action)); | |
1068 | a.ops = a_o; | |
1069 | ||
1070 | if (a_o->walk == NULL) { | |
26dab893 | 1071 | printk("tc_dump_action: %s !capable of dumping table\n", a_o->kind); |
7ba699c6 | 1072 | goto nla_put_failure; |
1da177e4 LT |
1073 | } |
1074 | ||
1075 | nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, | |
10297b99 | 1076 | cb->nlh->nlmsg_type, sizeof(*t)); |
1da177e4 LT |
1077 | t = NLMSG_DATA(nlh); |
1078 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
1079 | t->tca__pad1 = 0; |
1080 | t->tca__pad2 = 0; | |
1da177e4 | 1081 | |
4b3550ef PM |
1082 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
1083 | if (nest == NULL) | |
1084 | goto nla_put_failure; | |
1da177e4 LT |
1085 | |
1086 | ret = a_o->walk(skb, cb, RTM_GETACTION, &a); | |
1087 | if (ret < 0) | |
7ba699c6 | 1088 | goto nla_put_failure; |
1da177e4 LT |
1089 | |
1090 | if (ret > 0) { | |
4b3550ef | 1091 | nla_nest_end(skb, nest); |
1da177e4 LT |
1092 | ret = skb->len; |
1093 | } else | |
4b3550ef | 1094 | nla_nest_cancel(skb, nest); |
1da177e4 | 1095 | |
27a884dc | 1096 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1097 | if (NETLINK_CB(cb->skb).pid && ret) |
1098 | nlh->nlmsg_flags |= NLM_F_MULTI; | |
1099 | module_put(a_o->owner); | |
1100 | return skb->len; | |
1101 | ||
7ba699c6 | 1102 | nla_put_failure: |
1da177e4 LT |
1103 | nlmsg_failure: |
1104 | module_put(a_o->owner); | |
dc5fc579 | 1105 | nlmsg_trim(skb, b); |
1da177e4 LT |
1106 | return skb->len; |
1107 | } | |
1108 | ||
1109 | static int __init tc_action_init(void) | |
1110 | { | |
708914cc TG |
1111 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL); |
1112 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL); | |
1113 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action); | |
1da177e4 | 1114 | |
1da177e4 LT |
1115 | return 0; |
1116 | } | |
1117 | ||
1118 | subsys_initcall(tc_action_init); |