Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * net/sched/act_api.c Packet action API. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Author: Jamal Hadi Salim | |
10 | * | |
11 | * | |
12 | */ | |
13 | ||
1da177e4 LT |
14 | #include <linux/types.h> |
15 | #include <linux/kernel.h> | |
1da177e4 | 16 | #include <linux/string.h> |
1da177e4 | 17 | #include <linux/errno.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
1da177e4 | 19 | #include <linux/skbuff.h> |
1da177e4 LT |
20 | #include <linux/init.h> |
21 | #include <linux/kmod.h> | |
ab27cfb8 | 22 | #include <linux/err.h> |
b854272b DL |
23 | #include <net/net_namespace.h> |
24 | #include <net/sock.h> | |
1da177e4 LT |
25 | #include <net/sch_generic.h> |
26 | #include <net/act_api.h> | |
dc5fc579 | 27 | #include <net/netlink.h> |
1da177e4 | 28 | |
e9ce1cd3 DM |
29 | void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo) |
30 | { | |
31 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); | |
32 | struct tcf_common **p1p; | |
33 | ||
34 | for (p1p = &hinfo->htab[h]; *p1p; p1p = &(*p1p)->tcfc_next) { | |
35 | if (*p1p == p) { | |
36 | write_lock_bh(hinfo->lock); | |
37 | *p1p = p->tcfc_next; | |
38 | write_unlock_bh(hinfo->lock); | |
e9ce1cd3 DM |
39 | gen_kill_estimator(&p->tcfc_bstats, |
40 | &p->tcfc_rate_est); | |
e9ce1cd3 DM |
41 | kfree(p); |
42 | return; | |
43 | } | |
44 | } | |
547b792c | 45 | WARN_ON(1); |
e9ce1cd3 DM |
46 | } |
47 | EXPORT_SYMBOL(tcf_hash_destroy); | |
48 | ||
49 | int tcf_hash_release(struct tcf_common *p, int bind, | |
50 | struct tcf_hashinfo *hinfo) | |
51 | { | |
52 | int ret = 0; | |
53 | ||
54 | if (p) { | |
55 | if (bind) | |
56 | p->tcfc_bindcnt--; | |
57 | ||
58 | p->tcfc_refcnt--; | |
10297b99 | 59 | if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) { |
e9ce1cd3 DM |
60 | tcf_hash_destroy(p, hinfo); |
61 | ret = 1; | |
62 | } | |
63 | } | |
64 | return ret; | |
65 | } | |
66 | EXPORT_SYMBOL(tcf_hash_release); | |
67 | ||
68 | static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
69 | struct tc_action *a, struct tcf_hashinfo *hinfo) | |
70 | { | |
71 | struct tcf_common *p; | |
72 | int err = 0, index = -1,i = 0, s_i = 0, n_i = 0; | |
4b3550ef | 73 | struct nlattr *nest; |
e9ce1cd3 | 74 | |
e1e992e5 | 75 | read_lock_bh(hinfo->lock); |
e9ce1cd3 DM |
76 | |
77 | s_i = cb->args[0]; | |
78 | ||
79 | for (i = 0; i < (hinfo->hmask + 1); i++) { | |
80 | p = hinfo->htab[tcf_hash(i, hinfo->hmask)]; | |
81 | ||
82 | for (; p; p = p->tcfc_next) { | |
83 | index++; | |
84 | if (index < s_i) | |
85 | continue; | |
86 | a->priv = p; | |
87 | a->order = n_i; | |
4b3550ef PM |
88 | |
89 | nest = nla_nest_start(skb, a->order); | |
90 | if (nest == NULL) | |
91 | goto nla_put_failure; | |
e9ce1cd3 DM |
92 | err = tcf_action_dump_1(skb, a, 0, 0); |
93 | if (err < 0) { | |
94 | index--; | |
4b3550ef | 95 | nlmsg_trim(skb, nest); |
e9ce1cd3 DM |
96 | goto done; |
97 | } | |
4b3550ef | 98 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
99 | n_i++; |
100 | if (n_i >= TCA_ACT_MAX_PRIO) | |
101 | goto done; | |
102 | } | |
103 | } | |
104 | done: | |
e1e992e5 | 105 | read_unlock_bh(hinfo->lock); |
e9ce1cd3 DM |
106 | if (n_i) |
107 | cb->args[0] += n_i; | |
108 | return n_i; | |
109 | ||
7ba699c6 | 110 | nla_put_failure: |
4b3550ef | 111 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
112 | goto done; |
113 | } | |
114 | ||
115 | static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a, | |
116 | struct tcf_hashinfo *hinfo) | |
117 | { | |
118 | struct tcf_common *p, *s_p; | |
4b3550ef | 119 | struct nlattr *nest; |
e9ce1cd3 DM |
120 | int i= 0, n_i = 0; |
121 | ||
4b3550ef PM |
122 | nest = nla_nest_start(skb, a->order); |
123 | if (nest == NULL) | |
124 | goto nla_put_failure; | |
57e1c487 | 125 | NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind); |
e9ce1cd3 DM |
126 | for (i = 0; i < (hinfo->hmask + 1); i++) { |
127 | p = hinfo->htab[tcf_hash(i, hinfo->hmask)]; | |
128 | ||
129 | while (p != NULL) { | |
130 | s_p = p->tcfc_next; | |
131 | if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo)) | |
132 | module_put(a->ops->owner); | |
133 | n_i++; | |
134 | p = s_p; | |
135 | } | |
136 | } | |
24beeab5 | 137 | NLA_PUT_U32(skb, TCA_FCNT, n_i); |
4b3550ef | 138 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
139 | |
140 | return n_i; | |
7ba699c6 | 141 | nla_put_failure: |
4b3550ef | 142 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
143 | return -EINVAL; |
144 | } | |
145 | ||
146 | int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
147 | int type, struct tc_action *a) | |
148 | { | |
149 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
150 | ||
151 | if (type == RTM_DELACTION) { | |
152 | return tcf_del_walker(skb, a, hinfo); | |
153 | } else if (type == RTM_GETACTION) { | |
154 | return tcf_dump_walker(skb, cb, a, hinfo); | |
155 | } else { | |
156 | printk("tcf_generic_walker: unknown action %d\n", type); | |
157 | return -EINVAL; | |
158 | } | |
159 | } | |
160 | EXPORT_SYMBOL(tcf_generic_walker); | |
161 | ||
162 | struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo) | |
163 | { | |
164 | struct tcf_common *p; | |
165 | ||
e1e992e5 | 166 | read_lock_bh(hinfo->lock); |
e9ce1cd3 DM |
167 | for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p; |
168 | p = p->tcfc_next) { | |
169 | if (p->tcfc_index == index) | |
170 | break; | |
171 | } | |
e1e992e5 | 172 | read_unlock_bh(hinfo->lock); |
e9ce1cd3 DM |
173 | |
174 | return p; | |
175 | } | |
176 | EXPORT_SYMBOL(tcf_hash_lookup); | |
177 | ||
178 | u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo) | |
179 | { | |
180 | u32 val = *idx_gen; | |
181 | ||
182 | do { | |
183 | if (++val == 0) | |
184 | val = 1; | |
185 | } while (tcf_hash_lookup(val, hinfo)); | |
186 | ||
187 | return (*idx_gen = val); | |
188 | } | |
189 | EXPORT_SYMBOL(tcf_hash_new_index); | |
190 | ||
191 | int tcf_hash_search(struct tc_action *a, u32 index) | |
192 | { | |
193 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
194 | struct tcf_common *p = tcf_hash_lookup(index, hinfo); | |
195 | ||
196 | if (p) { | |
197 | a->priv = p; | |
198 | return 1; | |
199 | } | |
200 | return 0; | |
201 | } | |
202 | EXPORT_SYMBOL(tcf_hash_search); | |
203 | ||
204 | struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind, | |
205 | struct tcf_hashinfo *hinfo) | |
206 | { | |
207 | struct tcf_common *p = NULL; | |
208 | if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) { | |
76aab2c1 | 209 | if (bind) |
e9ce1cd3 | 210 | p->tcfc_bindcnt++; |
76aab2c1 | 211 | p->tcfc_refcnt++; |
e9ce1cd3 DM |
212 | a->priv = p; |
213 | } | |
214 | return p; | |
215 | } | |
216 | EXPORT_SYMBOL(tcf_hash_check); | |
217 | ||
0e991ec6 SH |
218 | struct tcf_common *tcf_hash_create(u32 index, struct nlattr *est, |
219 | struct tc_action *a, int size, int bind, | |
220 | u32 *idx_gen, struct tcf_hashinfo *hinfo) | |
e9ce1cd3 DM |
221 | { |
222 | struct tcf_common *p = kzalloc(size, GFP_KERNEL); | |
223 | ||
224 | if (unlikely(!p)) | |
0e991ec6 | 225 | return ERR_PTR(-ENOMEM); |
e9ce1cd3 DM |
226 | p->tcfc_refcnt = 1; |
227 | if (bind) | |
228 | p->tcfc_bindcnt = 1; | |
229 | ||
230 | spin_lock_init(&p->tcfc_lock); | |
e9ce1cd3 DM |
231 | p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo); |
232 | p->tcfc_tm.install = jiffies; | |
233 | p->tcfc_tm.lastuse = jiffies; | |
0e991ec6 SH |
234 | if (est) { |
235 | int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est, | |
236 | &p->tcfc_lock, est); | |
237 | if (err) { | |
238 | kfree(p); | |
239 | return ERR_PTR(err); | |
240 | } | |
241 | } | |
242 | ||
e9ce1cd3 DM |
243 | a->priv = (void *) p; |
244 | return p; | |
245 | } | |
246 | EXPORT_SYMBOL(tcf_hash_create); | |
247 | ||
248 | void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo) | |
249 | { | |
250 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); | |
251 | ||
252 | write_lock_bh(hinfo->lock); | |
253 | p->tcfc_next = hinfo->htab[h]; | |
254 | hinfo->htab[h] = p; | |
255 | write_unlock_bh(hinfo->lock); | |
256 | } | |
257 | EXPORT_SYMBOL(tcf_hash_insert); | |
1da177e4 LT |
258 | |
259 | static struct tc_action_ops *act_base = NULL; | |
260 | static DEFINE_RWLOCK(act_mod_lock); | |
261 | ||
262 | int tcf_register_action(struct tc_action_ops *act) | |
263 | { | |
264 | struct tc_action_ops *a, **ap; | |
265 | ||
266 | write_lock(&act_mod_lock); | |
267 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) { | |
268 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { | |
269 | write_unlock(&act_mod_lock); | |
270 | return -EEXIST; | |
271 | } | |
272 | } | |
273 | act->next = NULL; | |
274 | *ap = act; | |
275 | write_unlock(&act_mod_lock); | |
276 | return 0; | |
277 | } | |
62e3ba1b | 278 | EXPORT_SYMBOL(tcf_register_action); |
1da177e4 LT |
279 | |
280 | int tcf_unregister_action(struct tc_action_ops *act) | |
281 | { | |
282 | struct tc_action_ops *a, **ap; | |
283 | int err = -ENOENT; | |
284 | ||
285 | write_lock(&act_mod_lock); | |
286 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) | |
287 | if (a == act) | |
288 | break; | |
289 | if (a) { | |
290 | *ap = a->next; | |
291 | a->next = NULL; | |
292 | err = 0; | |
293 | } | |
294 | write_unlock(&act_mod_lock); | |
295 | return err; | |
296 | } | |
62e3ba1b | 297 | EXPORT_SYMBOL(tcf_unregister_action); |
1da177e4 LT |
298 | |
299 | /* lookup by name */ | |
300 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
301 | { | |
302 | struct tc_action_ops *a = NULL; | |
303 | ||
304 | if (kind) { | |
305 | read_lock(&act_mod_lock); | |
306 | for (a = act_base; a; a = a->next) { | |
307 | if (strcmp(kind, a->kind) == 0) { | |
308 | if (!try_module_get(a->owner)) { | |
309 | read_unlock(&act_mod_lock); | |
310 | return NULL; | |
311 | } | |
312 | break; | |
313 | } | |
314 | } | |
315 | read_unlock(&act_mod_lock); | |
316 | } | |
317 | return a; | |
318 | } | |
319 | ||
7ba699c6 PM |
320 | /* lookup by nlattr */ |
321 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) | |
1da177e4 LT |
322 | { |
323 | struct tc_action_ops *a = NULL; | |
324 | ||
325 | if (kind) { | |
326 | read_lock(&act_mod_lock); | |
327 | for (a = act_base; a; a = a->next) { | |
7ba699c6 | 328 | if (nla_strcmp(kind, a->kind) == 0) { |
1da177e4 LT |
329 | if (!try_module_get(a->owner)) { |
330 | read_unlock(&act_mod_lock); | |
331 | return NULL; | |
332 | } | |
333 | break; | |
334 | } | |
335 | } | |
336 | read_unlock(&act_mod_lock); | |
337 | } | |
338 | return a; | |
339 | } | |
340 | ||
341 | #if 0 | |
342 | /* lookup by id */ | |
343 | static struct tc_action_ops *tc_lookup_action_id(u32 type) | |
344 | { | |
345 | struct tc_action_ops *a = NULL; | |
346 | ||
347 | if (type) { | |
348 | read_lock(&act_mod_lock); | |
349 | for (a = act_base; a; a = a->next) { | |
350 | if (a->type == type) { | |
351 | if (!try_module_get(a->owner)) { | |
352 | read_unlock(&act_mod_lock); | |
353 | return NULL; | |
354 | } | |
355 | break; | |
356 | } | |
357 | } | |
358 | read_unlock(&act_mod_lock); | |
359 | } | |
360 | return a; | |
361 | } | |
362 | #endif | |
363 | ||
364 | int tcf_action_exec(struct sk_buff *skb, struct tc_action *act, | |
10297b99 | 365 | struct tcf_result *res) |
1da177e4 LT |
366 | { |
367 | struct tc_action *a; | |
368 | int ret = -1; | |
369 | ||
370 | if (skb->tc_verd & TC_NCLS) { | |
371 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
1da177e4 LT |
372 | ret = TC_ACT_OK; |
373 | goto exec_done; | |
374 | } | |
375 | while ((a = act) != NULL) { | |
376 | repeat: | |
377 | if (a->ops && a->ops->act) { | |
f43c5a0d | 378 | ret = a->ops->act(skb, a, res); |
1da177e4 LT |
379 | if (TC_MUNGED & skb->tc_verd) { |
380 | /* copied already, allow trampling */ | |
381 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); | |
382 | skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd); | |
383 | } | |
1da177e4 LT |
384 | if (ret == TC_ACT_REPEAT) |
385 | goto repeat; /* we need a ttl - JHS */ | |
14d50e78 HS |
386 | if (ret != TC_ACT_PIPE) |
387 | goto exec_done; | |
1da177e4 LT |
388 | } |
389 | act = a->next; | |
390 | } | |
391 | exec_done: | |
1da177e4 LT |
392 | return ret; |
393 | } | |
62e3ba1b | 394 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 LT |
395 | |
396 | void tcf_action_destroy(struct tc_action *act, int bind) | |
397 | { | |
398 | struct tc_action *a; | |
399 | ||
400 | for (a = act; a; a = act) { | |
401 | if (a->ops && a->ops->cleanup) { | |
1da177e4 LT |
402 | if (a->ops->cleanup(a, bind) == ACT_P_DELETED) |
403 | module_put(a->ops->owner); | |
404 | act = act->next; | |
405 | kfree(a); | |
406 | } else { /*FIXME: Remove later - catch insertion bugs*/ | |
407 | printk("tcf_action_destroy: BUG? destroying NULL ops\n"); | |
408 | act = act->next; | |
409 | kfree(a); | |
410 | } | |
411 | } | |
412 | } | |
413 | ||
414 | int | |
415 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
416 | { | |
417 | int err = -EINVAL; | |
418 | ||
419 | if (a->ops == NULL || a->ops->dump == NULL) | |
420 | return err; | |
421 | return a->ops->dump(skb, a, bind, ref); | |
422 | } | |
423 | ||
424 | int | |
425 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
426 | { | |
427 | int err = -EINVAL; | |
27a884dc | 428 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 429 | struct nlattr *nest; |
1da177e4 LT |
430 | |
431 | if (a->ops == NULL || a->ops->dump == NULL) | |
432 | return err; | |
433 | ||
57e1c487 | 434 | NLA_PUT_STRING(skb, TCA_KIND, a->ops->kind); |
1da177e4 | 435 | if (tcf_action_copy_stats(skb, a, 0)) |
7ba699c6 | 436 | goto nla_put_failure; |
4b3550ef PM |
437 | nest = nla_nest_start(skb, TCA_OPTIONS); |
438 | if (nest == NULL) | |
439 | goto nla_put_failure; | |
1da177e4 | 440 | if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) { |
4b3550ef | 441 | nla_nest_end(skb, nest); |
1da177e4 LT |
442 | return err; |
443 | } | |
444 | ||
7ba699c6 | 445 | nla_put_failure: |
dc5fc579 | 446 | nlmsg_trim(skb, b); |
1da177e4 LT |
447 | return -1; |
448 | } | |
62e3ba1b | 449 | EXPORT_SYMBOL(tcf_action_dump_1); |
1da177e4 LT |
450 | |
451 | int | |
452 | tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref) | |
453 | { | |
454 | struct tc_action *a; | |
455 | int err = -EINVAL; | |
4b3550ef | 456 | struct nlattr *nest; |
1da177e4 LT |
457 | |
458 | while ((a = act) != NULL) { | |
1da177e4 | 459 | act = a->next; |
4b3550ef PM |
460 | nest = nla_nest_start(skb, a->order); |
461 | if (nest == NULL) | |
462 | goto nla_put_failure; | |
1da177e4 LT |
463 | err = tcf_action_dump_1(skb, a, bind, ref); |
464 | if (err < 0) | |
4fe683f5 | 465 | goto errout; |
4b3550ef | 466 | nla_nest_end(skb, nest); |
1da177e4 LT |
467 | } |
468 | ||
469 | return 0; | |
470 | ||
7ba699c6 | 471 | nla_put_failure: |
4fe683f5 TG |
472 | err = -EINVAL; |
473 | errout: | |
4b3550ef | 474 | nla_nest_cancel(skb, nest); |
4fe683f5 | 475 | return err; |
1da177e4 LT |
476 | } |
477 | ||
7ba699c6 | 478 | struct tc_action *tcf_action_init_1(struct nlattr *nla, struct nlattr *est, |
ab27cfb8 | 479 | char *name, int ovr, int bind) |
1da177e4 LT |
480 | { |
481 | struct tc_action *a; | |
482 | struct tc_action_ops *a_o; | |
483 | char act_name[IFNAMSIZ]; | |
7ba699c6 PM |
484 | struct nlattr *tb[TCA_ACT_MAX+1]; |
485 | struct nlattr *kind; | |
ab27cfb8 | 486 | int err; |
1da177e4 | 487 | |
1da177e4 | 488 | if (name == NULL) { |
cee63723 PM |
489 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
490 | if (err < 0) | |
1da177e4 | 491 | goto err_out; |
cee63723 | 492 | err = -EINVAL; |
7ba699c6 | 493 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
494 | if (kind == NULL) |
495 | goto err_out; | |
7ba699c6 | 496 | if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) |
1da177e4 LT |
497 | goto err_out; |
498 | } else { | |
cee63723 | 499 | err = -EINVAL; |
1da177e4 LT |
500 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) |
501 | goto err_out; | |
502 | } | |
503 | ||
504 | a_o = tc_lookup_action_n(act_name); | |
505 | if (a_o == NULL) { | |
95a5afca | 506 | #ifdef CONFIG_MODULES |
1da177e4 | 507 | rtnl_unlock(); |
4bba3925 | 508 | request_module("act_%s", act_name); |
1da177e4 LT |
509 | rtnl_lock(); |
510 | ||
511 | a_o = tc_lookup_action_n(act_name); | |
512 | ||
513 | /* We dropped the RTNL semaphore in order to | |
514 | * perform the module load. So, even if we | |
515 | * succeeded in loading the module we have to | |
516 | * tell the caller to replay the request. We | |
517 | * indicate this using -EAGAIN. | |
518 | */ | |
519 | if (a_o != NULL) { | |
ab27cfb8 | 520 | err = -EAGAIN; |
1da177e4 LT |
521 | goto err_mod; |
522 | } | |
523 | #endif | |
ab27cfb8 | 524 | err = -ENOENT; |
1da177e4 LT |
525 | goto err_out; |
526 | } | |
527 | ||
ab27cfb8 | 528 | err = -ENOMEM; |
0da974f4 | 529 | a = kzalloc(sizeof(*a), GFP_KERNEL); |
1da177e4 LT |
530 | if (a == NULL) |
531 | goto err_mod; | |
1da177e4 LT |
532 | |
533 | /* backward compatibility for policer */ | |
534 | if (name == NULL) | |
ab27cfb8 | 535 | err = a_o->init(tb[TCA_ACT_OPTIONS], est, a, ovr, bind); |
1da177e4 | 536 | else |
ab27cfb8 PM |
537 | err = a_o->init(nla, est, a, ovr, bind); |
538 | if (err < 0) | |
1da177e4 LT |
539 | goto err_free; |
540 | ||
541 | /* module count goes up only when brand new policy is created | |
542 | if it exists and is only bound to in a_o->init() then | |
543 | ACT_P_CREATED is not returned (a zero is). | |
544 | */ | |
ab27cfb8 | 545 | if (err != ACT_P_CREATED) |
1da177e4 LT |
546 | module_put(a_o->owner); |
547 | a->ops = a_o; | |
1da177e4 | 548 | |
1da177e4 LT |
549 | return a; |
550 | ||
551 | err_free: | |
552 | kfree(a); | |
553 | err_mod: | |
554 | module_put(a_o->owner); | |
555 | err_out: | |
ab27cfb8 | 556 | return ERR_PTR(err); |
1da177e4 LT |
557 | } |
558 | ||
7ba699c6 | 559 | struct tc_action *tcf_action_init(struct nlattr *nla, struct nlattr *est, |
ab27cfb8 | 560 | char *name, int ovr, int bind) |
1da177e4 | 561 | { |
7ba699c6 | 562 | struct nlattr *tb[TCA_ACT_MAX_PRIO+1]; |
1da177e4 | 563 | struct tc_action *head = NULL, *act, *act_prev = NULL; |
cee63723 | 564 | int err; |
1da177e4 LT |
565 | int i; |
566 | ||
cee63723 PM |
567 | err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
568 | if (err < 0) | |
569 | return ERR_PTR(err); | |
1da177e4 | 570 | |
7ba699c6 | 571 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
ab27cfb8 PM |
572 | act = tcf_action_init_1(tb[i], est, name, ovr, bind); |
573 | if (IS_ERR(act)) | |
1da177e4 | 574 | goto err; |
7ba699c6 | 575 | act->order = i; |
1da177e4 LT |
576 | |
577 | if (head == NULL) | |
578 | head = act; | |
579 | else | |
580 | act_prev->next = act; | |
581 | act_prev = act; | |
582 | } | |
583 | return head; | |
584 | ||
585 | err: | |
586 | if (head != NULL) | |
587 | tcf_action_destroy(head, bind); | |
ab27cfb8 | 588 | return act; |
1da177e4 LT |
589 | } |
590 | ||
591 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a, | |
592 | int compat_mode) | |
593 | { | |
594 | int err = 0; | |
595 | struct gnet_dump d; | |
596 | struct tcf_act_hdr *h = a->priv; | |
10297b99 | 597 | |
1da177e4 LT |
598 | if (h == NULL) |
599 | goto errout; | |
600 | ||
601 | /* compat_mode being true specifies a call that is supposed | |
06fe9fb4 | 602 | * to add additional backward compatibility statistic TLVs. |
1da177e4 LT |
603 | */ |
604 | if (compat_mode) { | |
605 | if (a->type == TCA_OLD_COMPAT) | |
606 | err = gnet_stats_start_copy_compat(skb, 0, | |
4bdf3991 | 607 | TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d); |
1da177e4 LT |
608 | else |
609 | return 0; | |
610 | } else | |
611 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
4bdf3991 | 612 | &h->tcf_lock, &d); |
1da177e4 LT |
613 | |
614 | if (err < 0) | |
615 | goto errout; | |
616 | ||
617 | if (a->ops != NULL && a->ops->get_stats != NULL) | |
618 | if (a->ops->get_stats(skb, a) < 0) | |
619 | goto errout; | |
620 | ||
e9ce1cd3 | 621 | if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 || |
d250a5f9 ED |
622 | gnet_stats_copy_rate_est(&d, &h->tcf_bstats, |
623 | &h->tcf_rate_est) < 0 || | |
e9ce1cd3 | 624 | gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0) |
1da177e4 LT |
625 | goto errout; |
626 | ||
627 | if (gnet_stats_finish_copy(&d) < 0) | |
628 | goto errout; | |
629 | ||
630 | return 0; | |
631 | ||
632 | errout: | |
633 | return -1; | |
634 | } | |
635 | ||
636 | static int | |
637 | tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq, | |
10297b99 | 638 | u16 flags, int event, int bind, int ref) |
1da177e4 LT |
639 | { |
640 | struct tcamsg *t; | |
641 | struct nlmsghdr *nlh; | |
27a884dc | 642 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 643 | struct nlattr *nest; |
1da177e4 | 644 | |
e431b8c0 JHS |
645 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
646 | ||
1da177e4 LT |
647 | t = NLMSG_DATA(nlh); |
648 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
649 | t->tca__pad1 = 0; |
650 | t->tca__pad2 = 0; | |
10297b99 | 651 | |
4b3550ef PM |
652 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
653 | if (nest == NULL) | |
654 | goto nla_put_failure; | |
1da177e4 LT |
655 | |
656 | if (tcf_action_dump(skb, a, bind, ref) < 0) | |
7ba699c6 | 657 | goto nla_put_failure; |
1da177e4 | 658 | |
4b3550ef | 659 | nla_nest_end(skb, nest); |
10297b99 | 660 | |
27a884dc | 661 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
662 | return skb->len; |
663 | ||
7ba699c6 | 664 | nla_put_failure: |
1da177e4 | 665 | nlmsg_failure: |
dc5fc579 | 666 | nlmsg_trim(skb, b); |
1da177e4 LT |
667 | return -1; |
668 | } | |
669 | ||
670 | static int | |
671 | act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event) | |
672 | { | |
673 | struct sk_buff *skb; | |
1da177e4 LT |
674 | |
675 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
676 | if (!skb) | |
677 | return -ENOBUFS; | |
678 | if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { | |
679 | kfree_skb(skb); | |
680 | return -EINVAL; | |
681 | } | |
2942e900 | 682 | |
97c53cac | 683 | return rtnl_unicast(skb, &init_net, pid); |
1da177e4 LT |
684 | } |
685 | ||
686 | static struct tc_action * | |
ab27cfb8 | 687 | tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 pid) |
1da177e4 | 688 | { |
7ba699c6 | 689 | struct nlattr *tb[TCA_ACT_MAX+1]; |
1da177e4 LT |
690 | struct tc_action *a; |
691 | int index; | |
ab27cfb8 | 692 | int err; |
1da177e4 | 693 | |
cee63723 PM |
694 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
695 | if (err < 0) | |
ab27cfb8 | 696 | goto err_out; |
1da177e4 | 697 | |
cee63723 | 698 | err = -EINVAL; |
7ba699c6 PM |
699 | if (tb[TCA_ACT_INDEX] == NULL || |
700 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) | |
ab27cfb8 | 701 | goto err_out; |
1587bac4 | 702 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 703 | |
ab27cfb8 | 704 | err = -ENOMEM; |
0da974f4 | 705 | a = kzalloc(sizeof(struct tc_action), GFP_KERNEL); |
1da177e4 | 706 | if (a == NULL) |
ab27cfb8 | 707 | goto err_out; |
1da177e4 | 708 | |
ab27cfb8 | 709 | err = -EINVAL; |
7ba699c6 | 710 | a->ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
1da177e4 LT |
711 | if (a->ops == NULL) |
712 | goto err_free; | |
713 | if (a->ops->lookup == NULL) | |
714 | goto err_mod; | |
ab27cfb8 | 715 | err = -ENOENT; |
1da177e4 LT |
716 | if (a->ops->lookup(a, index) == 0) |
717 | goto err_mod; | |
718 | ||
719 | module_put(a->ops->owner); | |
1da177e4 | 720 | return a; |
ab27cfb8 | 721 | |
1da177e4 LT |
722 | err_mod: |
723 | module_put(a->ops->owner); | |
724 | err_free: | |
725 | kfree(a); | |
ab27cfb8 PM |
726 | err_out: |
727 | return ERR_PTR(err); | |
1da177e4 LT |
728 | } |
729 | ||
730 | static void cleanup_a(struct tc_action *act) | |
731 | { | |
732 | struct tc_action *a; | |
733 | ||
734 | for (a = act; a; a = act) { | |
735 | act = a->next; | |
736 | kfree(a); | |
737 | } | |
738 | } | |
739 | ||
740 | static struct tc_action *create_a(int i) | |
741 | { | |
742 | struct tc_action *act; | |
743 | ||
0da974f4 | 744 | act = kzalloc(sizeof(*act), GFP_KERNEL); |
1da177e4 LT |
745 | if (act == NULL) { |
746 | printk("create_a: failed to alloc!\n"); | |
747 | return NULL; | |
748 | } | |
1da177e4 LT |
749 | act->order = i; |
750 | return act; | |
751 | } | |
752 | ||
7ba699c6 | 753 | static int tca_action_flush(struct nlattr *nla, struct nlmsghdr *n, u32 pid) |
1da177e4 LT |
754 | { |
755 | struct sk_buff *skb; | |
756 | unsigned char *b; | |
757 | struct nlmsghdr *nlh; | |
758 | struct tcamsg *t; | |
759 | struct netlink_callback dcb; | |
4b3550ef | 760 | struct nlattr *nest; |
7ba699c6 PM |
761 | struct nlattr *tb[TCA_ACT_MAX+1]; |
762 | struct nlattr *kind; | |
1da177e4 | 763 | struct tc_action *a = create_a(0); |
36723873 | 764 | int err = -ENOMEM; |
1da177e4 LT |
765 | |
766 | if (a == NULL) { | |
767 | printk("tca_action_flush: couldnt create tc_action\n"); | |
768 | return err; | |
769 | } | |
770 | ||
771 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
772 | if (!skb) { | |
773 | printk("tca_action_flush: failed skb alloc\n"); | |
774 | kfree(a); | |
36723873 | 775 | return err; |
1da177e4 LT |
776 | } |
777 | ||
27a884dc | 778 | b = skb_tail_pointer(skb); |
1da177e4 | 779 | |
cee63723 PM |
780 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
781 | if (err < 0) | |
1da177e4 LT |
782 | goto err_out; |
783 | ||
cee63723 | 784 | err = -EINVAL; |
7ba699c6 | 785 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
786 | a->ops = tc_lookup_action(kind); |
787 | if (a->ops == NULL) | |
788 | goto err_out; | |
789 | ||
790 | nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t)); | |
791 | t = NLMSG_DATA(nlh); | |
792 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
793 | t->tca__pad1 = 0; |
794 | t->tca__pad2 = 0; | |
1da177e4 | 795 | |
4b3550ef PM |
796 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
797 | if (nest == NULL) | |
798 | goto nla_put_failure; | |
1da177e4 LT |
799 | |
800 | err = a->ops->walk(skb, &dcb, RTM_DELACTION, a); | |
801 | if (err < 0) | |
7ba699c6 | 802 | goto nla_put_failure; |
f97017cd JHS |
803 | if (err == 0) |
804 | goto noflush_out; | |
1da177e4 | 805 | |
4b3550ef | 806 | nla_nest_end(skb, nest); |
1da177e4 | 807 | |
27a884dc | 808 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
809 | nlh->nlmsg_flags |= NLM_F_ROOT; |
810 | module_put(a->ops->owner); | |
811 | kfree(a); | |
97c53cac | 812 | err = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
813 | if (err > 0) |
814 | return 0; | |
815 | ||
816 | return err; | |
817 | ||
7ba699c6 | 818 | nla_put_failure: |
1da177e4 | 819 | nlmsg_failure: |
ebbaeab1 | 820 | module_put(a->ops->owner); |
1da177e4 | 821 | err_out: |
f97017cd | 822 | noflush_out: |
1da177e4 LT |
823 | kfree_skb(skb); |
824 | kfree(a); | |
825 | return err; | |
826 | } | |
827 | ||
828 | static int | |
7ba699c6 | 829 | tca_action_gd(struct nlattr *nla, struct nlmsghdr *n, u32 pid, int event) |
1da177e4 | 830 | { |
cee63723 | 831 | int i, ret; |
7ba699c6 | 832 | struct nlattr *tb[TCA_ACT_MAX_PRIO+1]; |
1da177e4 LT |
833 | struct tc_action *head = NULL, *act, *act_prev = NULL; |
834 | ||
cee63723 PM |
835 | ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
836 | if (ret < 0) | |
837 | return ret; | |
1da177e4 LT |
838 | |
839 | if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) { | |
f97017cd JHS |
840 | if (tb[1] != NULL) |
841 | return tca_action_flush(tb[1], n, pid); | |
842 | else | |
843 | return -EINVAL; | |
1da177e4 LT |
844 | } |
845 | ||
7ba699c6 | 846 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
ab27cfb8 PM |
847 | act = tcf_action_get_1(tb[i], n, pid); |
848 | if (IS_ERR(act)) { | |
849 | ret = PTR_ERR(act); | |
1da177e4 | 850 | goto err; |
ab27cfb8 | 851 | } |
7ba699c6 | 852 | act->order = i; |
1da177e4 LT |
853 | |
854 | if (head == NULL) | |
855 | head = act; | |
856 | else | |
857 | act_prev->next = act; | |
858 | act_prev = act; | |
859 | } | |
860 | ||
861 | if (event == RTM_GETACTION) | |
862 | ret = act_get_notify(pid, n, head, event); | |
863 | else { /* delete */ | |
864 | struct sk_buff *skb; | |
865 | ||
866 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
867 | if (!skb) { | |
868 | ret = -ENOBUFS; | |
869 | goto err; | |
870 | } | |
871 | ||
872 | if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event, | |
10297b99 | 873 | 0, 1) <= 0) { |
1da177e4 LT |
874 | kfree_skb(skb); |
875 | ret = -EINVAL; | |
876 | goto err; | |
877 | } | |
878 | ||
879 | /* now do the delete */ | |
880 | tcf_action_destroy(head, 0); | |
97c53cac | 881 | ret = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, |
10297b99 | 882 | n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
883 | if (ret > 0) |
884 | return 0; | |
885 | return ret; | |
886 | } | |
887 | err: | |
888 | cleanup_a(head); | |
889 | return ret; | |
890 | } | |
891 | ||
892 | static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event, | |
10297b99 | 893 | u16 flags) |
1da177e4 LT |
894 | { |
895 | struct tcamsg *t; | |
896 | struct nlmsghdr *nlh; | |
897 | struct sk_buff *skb; | |
4b3550ef | 898 | struct nlattr *nest; |
1da177e4 LT |
899 | unsigned char *b; |
900 | int err = 0; | |
901 | ||
902 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
903 | if (!skb) | |
904 | return -ENOBUFS; | |
905 | ||
27a884dc | 906 | b = skb_tail_pointer(skb); |
1da177e4 | 907 | |
e431b8c0 | 908 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
1da177e4 LT |
909 | t = NLMSG_DATA(nlh); |
910 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
911 | t->tca__pad1 = 0; |
912 | t->tca__pad2 = 0; | |
913 | ||
4b3550ef PM |
914 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
915 | if (nest == NULL) | |
916 | goto nla_put_failure; | |
1da177e4 LT |
917 | |
918 | if (tcf_action_dump(skb, a, 0, 0) < 0) | |
7ba699c6 | 919 | goto nla_put_failure; |
1da177e4 | 920 | |
4b3550ef | 921 | nla_nest_end(skb, nest); |
10297b99 | 922 | |
27a884dc | 923 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
ac6d439d | 924 | NETLINK_CB(skb).dst_group = RTNLGRP_TC; |
10297b99 | 925 | |
97c53cac | 926 | err = rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, flags&NLM_F_ECHO); |
1da177e4 LT |
927 | if (err > 0) |
928 | err = 0; | |
929 | return err; | |
930 | ||
7ba699c6 | 931 | nla_put_failure: |
1da177e4 | 932 | nlmsg_failure: |
f6e57464 | 933 | kfree_skb(skb); |
1da177e4 LT |
934 | return -1; |
935 | } | |
936 | ||
10297b99 | 937 | |
1da177e4 | 938 | static int |
7ba699c6 | 939 | tcf_action_add(struct nlattr *nla, struct nlmsghdr *n, u32 pid, int ovr) |
1da177e4 LT |
940 | { |
941 | int ret = 0; | |
942 | struct tc_action *act; | |
943 | struct tc_action *a; | |
944 | u32 seq = n->nlmsg_seq; | |
945 | ||
ab27cfb8 | 946 | act = tcf_action_init(nla, NULL, NULL, ovr, 0); |
1da177e4 LT |
947 | if (act == NULL) |
948 | goto done; | |
ab27cfb8 PM |
949 | if (IS_ERR(act)) { |
950 | ret = PTR_ERR(act); | |
951 | goto done; | |
952 | } | |
1da177e4 LT |
953 | |
954 | /* dump then free all the actions after update; inserted policy | |
955 | * stays intact | |
956 | * */ | |
957 | ret = tcf_add_notify(act, pid, seq, RTM_NEWACTION, n->nlmsg_flags); | |
958 | for (a = act; a; a = act) { | |
959 | act = a->next; | |
960 | kfree(a); | |
961 | } | |
962 | done: | |
963 | return ret; | |
964 | } | |
965 | ||
966 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
967 | { | |
3b1e0a65 | 968 | struct net *net = sock_net(skb->sk); |
7ba699c6 | 969 | struct nlattr *tca[TCA_ACT_MAX + 1]; |
1da177e4 LT |
970 | u32 pid = skb ? NETLINK_CB(skb).pid : 0; |
971 | int ret = 0, ovr = 0; | |
972 | ||
09ad9bc7 | 973 | if (!net_eq(net, &init_net)) |
b854272b DL |
974 | return -EINVAL; |
975 | ||
7ba699c6 PM |
976 | ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL); |
977 | if (ret < 0) | |
978 | return ret; | |
979 | ||
980 | if (tca[TCA_ACT_TAB] == NULL) { | |
1da177e4 LT |
981 | printk("tc_ctl_action: received NO action attribs\n"); |
982 | return -EINVAL; | |
983 | } | |
984 | ||
985 | /* n->nlmsg_flags&NLM_F_CREATE | |
986 | * */ | |
987 | switch (n->nlmsg_type) { | |
988 | case RTM_NEWACTION: | |
989 | /* we are going to assume all other flags | |
990 | * imply create only if it doesnt exist | |
991 | * Note that CREATE | EXCL implies that | |
992 | * but since we want avoid ambiguity (eg when flags | |
993 | * is zero) then just set this | |
994 | */ | |
995 | if (n->nlmsg_flags&NLM_F_REPLACE) | |
996 | ovr = 1; | |
997 | replay: | |
7ba699c6 | 998 | ret = tcf_action_add(tca[TCA_ACT_TAB], n, pid, ovr); |
1da177e4 LT |
999 | if (ret == -EAGAIN) |
1000 | goto replay; | |
1001 | break; | |
1002 | case RTM_DELACTION: | |
7ba699c6 | 1003 | ret = tca_action_gd(tca[TCA_ACT_TAB], n, pid, RTM_DELACTION); |
1da177e4 LT |
1004 | break; |
1005 | case RTM_GETACTION: | |
7ba699c6 | 1006 | ret = tca_action_gd(tca[TCA_ACT_TAB], n, pid, RTM_GETACTION); |
1da177e4 LT |
1007 | break; |
1008 | default: | |
1009 | BUG(); | |
1010 | } | |
1011 | ||
1012 | return ret; | |
1013 | } | |
1014 | ||
7ba699c6 | 1015 | static struct nlattr * |
3a6c2b41 | 1016 | find_dump_kind(const struct nlmsghdr *n) |
1da177e4 | 1017 | { |
7ba699c6 PM |
1018 | struct nlattr *tb1, *tb2[TCA_ACT_MAX+1]; |
1019 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; | |
1020 | struct nlattr *nla[TCAA_MAX + 1]; | |
1021 | struct nlattr *kind; | |
1da177e4 | 1022 | |
c96c9471 | 1023 | if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0) |
1da177e4 | 1024 | return NULL; |
7ba699c6 | 1025 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
1026 | if (tb1 == NULL) |
1027 | return NULL; | |
1028 | ||
7ba699c6 PM |
1029 | if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), |
1030 | NLMSG_ALIGN(nla_len(tb1)), NULL) < 0) | |
1da177e4 | 1031 | return NULL; |
1da177e4 | 1032 | |
6d834e04 PM |
1033 | if (tb[1] == NULL) |
1034 | return NULL; | |
1035 | if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]), | |
1036 | nla_len(tb[1]), NULL) < 0) | |
1da177e4 | 1037 | return NULL; |
7ba699c6 | 1038 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 1039 | |
26dab893 | 1040 | return kind; |
1da177e4 LT |
1041 | } |
1042 | ||
1043 | static int | |
1044 | tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) | |
1045 | { | |
3b1e0a65 | 1046 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1047 | struct nlmsghdr *nlh; |
27a884dc | 1048 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1049 | struct nlattr *nest; |
1da177e4 LT |
1050 | struct tc_action_ops *a_o; |
1051 | struct tc_action a; | |
1052 | int ret = 0; | |
1053 | struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh); | |
7ba699c6 | 1054 | struct nlattr *kind = find_dump_kind(cb->nlh); |
1da177e4 | 1055 | |
09ad9bc7 | 1056 | if (!net_eq(net, &init_net)) |
b854272b DL |
1057 | return 0; |
1058 | ||
1da177e4 LT |
1059 | if (kind == NULL) { |
1060 | printk("tc_dump_action: action bad kind\n"); | |
1061 | return 0; | |
1062 | } | |
1063 | ||
26dab893 | 1064 | a_o = tc_lookup_action(kind); |
1da177e4 | 1065 | if (a_o == NULL) { |
1da177e4 LT |
1066 | return 0; |
1067 | } | |
1068 | ||
1069 | memset(&a, 0, sizeof(struct tc_action)); | |
1070 | a.ops = a_o; | |
1071 | ||
1072 | if (a_o->walk == NULL) { | |
26dab893 | 1073 | printk("tc_dump_action: %s !capable of dumping table\n", a_o->kind); |
7ba699c6 | 1074 | goto nla_put_failure; |
1da177e4 LT |
1075 | } |
1076 | ||
1077 | nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, | |
10297b99 | 1078 | cb->nlh->nlmsg_type, sizeof(*t)); |
1da177e4 LT |
1079 | t = NLMSG_DATA(nlh); |
1080 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
1081 | t->tca__pad1 = 0; |
1082 | t->tca__pad2 = 0; | |
1da177e4 | 1083 | |
4b3550ef PM |
1084 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
1085 | if (nest == NULL) | |
1086 | goto nla_put_failure; | |
1da177e4 LT |
1087 | |
1088 | ret = a_o->walk(skb, cb, RTM_GETACTION, &a); | |
1089 | if (ret < 0) | |
7ba699c6 | 1090 | goto nla_put_failure; |
1da177e4 LT |
1091 | |
1092 | if (ret > 0) { | |
4b3550ef | 1093 | nla_nest_end(skb, nest); |
1da177e4 LT |
1094 | ret = skb->len; |
1095 | } else | |
4b3550ef | 1096 | nla_nest_cancel(skb, nest); |
1da177e4 | 1097 | |
27a884dc | 1098 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1099 | if (NETLINK_CB(cb->skb).pid && ret) |
1100 | nlh->nlmsg_flags |= NLM_F_MULTI; | |
1101 | module_put(a_o->owner); | |
1102 | return skb->len; | |
1103 | ||
7ba699c6 | 1104 | nla_put_failure: |
1da177e4 LT |
1105 | nlmsg_failure: |
1106 | module_put(a_o->owner); | |
dc5fc579 | 1107 | nlmsg_trim(skb, b); |
1da177e4 LT |
1108 | return skb->len; |
1109 | } | |
1110 | ||
1111 | static int __init tc_action_init(void) | |
1112 | { | |
708914cc TG |
1113 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL); |
1114 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL); | |
1115 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action); | |
1da177e4 | 1116 | |
1da177e4 LT |
1117 | return 0; |
1118 | } | |
1119 | ||
1120 | subsys_initcall(tc_action_init); |