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> |
3a9a231d | 23 | #include <linux/module.h> |
b854272b DL |
24 | #include <net/net_namespace.h> |
25 | #include <net/sock.h> | |
1da177e4 LT |
26 | #include <net/sch_generic.h> |
27 | #include <net/act_api.h> | |
dc5fc579 | 28 | #include <net/netlink.h> |
1da177e4 | 29 | |
e9ce1cd3 DM |
30 | void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo) |
31 | { | |
89819dc0 WC |
32 | spin_lock_bh(&hinfo->lock); |
33 | hlist_del(&p->tcfc_head); | |
34 | spin_unlock_bh(&hinfo->lock); | |
35 | gen_kill_estimator(&p->tcfc_bstats, | |
36 | &p->tcfc_rate_est); | |
37 | /* | |
38 | * gen_estimator est_timer() might access p->tcfc_lock | |
39 | * or bstats, wait a RCU grace period before freeing p | |
40 | */ | |
41 | kfree_rcu(p, tcfc_rcu); | |
e9ce1cd3 DM |
42 | } |
43 | EXPORT_SYMBOL(tcf_hash_destroy); | |
44 | ||
45 | int tcf_hash_release(struct tcf_common *p, int bind, | |
46 | struct tcf_hashinfo *hinfo) | |
47 | { | |
48 | int ret = 0; | |
49 | ||
50 | if (p) { | |
51 | if (bind) | |
52 | p->tcfc_bindcnt--; | |
53 | ||
54 | p->tcfc_refcnt--; | |
10297b99 | 55 | if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) { |
e9ce1cd3 DM |
56 | tcf_hash_destroy(p, hinfo); |
57 | ret = 1; | |
58 | } | |
59 | } | |
60 | return ret; | |
61 | } | |
62 | EXPORT_SYMBOL(tcf_hash_release); | |
63 | ||
64 | static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
c779f7af | 65 | struct tc_action *a) |
e9ce1cd3 | 66 | { |
c779f7af | 67 | struct tcf_hashinfo *hinfo = a->ops->hinfo; |
89819dc0 | 68 | struct hlist_head *head; |
e9ce1cd3 | 69 | struct tcf_common *p; |
cc7ec456 | 70 | int err = 0, index = -1, i = 0, s_i = 0, n_i = 0; |
4b3550ef | 71 | struct nlattr *nest; |
e9ce1cd3 | 72 | |
89819dc0 | 73 | spin_lock_bh(&hinfo->lock); |
e9ce1cd3 DM |
74 | |
75 | s_i = cb->args[0]; | |
76 | ||
77 | for (i = 0; i < (hinfo->hmask + 1); i++) { | |
89819dc0 | 78 | head = &hinfo->htab[tcf_hash(i, hinfo->hmask)]; |
e9ce1cd3 | 79 | |
89819dc0 | 80 | hlist_for_each_entry_rcu(p, head, tcfc_head) { |
e9ce1cd3 DM |
81 | index++; |
82 | if (index < s_i) | |
83 | continue; | |
84 | a->priv = p; | |
85 | a->order = n_i; | |
4b3550ef PM |
86 | |
87 | nest = nla_nest_start(skb, a->order); | |
88 | if (nest == NULL) | |
89 | goto nla_put_failure; | |
e9ce1cd3 DM |
90 | err = tcf_action_dump_1(skb, a, 0, 0); |
91 | if (err < 0) { | |
92 | index--; | |
4b3550ef | 93 | nlmsg_trim(skb, nest); |
e9ce1cd3 DM |
94 | goto done; |
95 | } | |
4b3550ef | 96 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
97 | n_i++; |
98 | if (n_i >= TCA_ACT_MAX_PRIO) | |
99 | goto done; | |
100 | } | |
101 | } | |
102 | done: | |
89819dc0 | 103 | spin_unlock_bh(&hinfo->lock); |
e9ce1cd3 DM |
104 | if (n_i) |
105 | cb->args[0] += n_i; | |
106 | return n_i; | |
107 | ||
7ba699c6 | 108 | nla_put_failure: |
4b3550ef | 109 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
110 | goto done; |
111 | } | |
112 | ||
c779f7af | 113 | static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a) |
e9ce1cd3 | 114 | { |
c779f7af | 115 | struct tcf_hashinfo *hinfo = a->ops->hinfo; |
89819dc0 WC |
116 | struct hlist_head *head; |
117 | struct hlist_node *n; | |
118 | struct tcf_common *p; | |
4b3550ef | 119 | struct nlattr *nest; |
cc7ec456 | 120 | int i = 0, n_i = 0; |
e9ce1cd3 | 121 | |
4b3550ef PM |
122 | nest = nla_nest_start(skb, a->order); |
123 | if (nest == NULL) | |
124 | goto nla_put_failure; | |
1b34ec43 DM |
125 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) |
126 | goto nla_put_failure; | |
e9ce1cd3 | 127 | for (i = 0; i < (hinfo->hmask + 1); i++) { |
89819dc0 WC |
128 | head = &hinfo->htab[tcf_hash(i, hinfo->hmask)]; |
129 | hlist_for_each_entry_safe(p, n, head, tcfc_head) { | |
805c1f4a | 130 | if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo)) { |
cc7ec456 | 131 | module_put(a->ops->owner); |
805c1f4a JHS |
132 | n_i++; |
133 | } | |
e9ce1cd3 DM |
134 | } |
135 | } | |
1b34ec43 DM |
136 | if (nla_put_u32(skb, TCA_FCNT, n_i)) |
137 | goto nla_put_failure; | |
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 | ||
9c75f402 | 146 | static int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb, |
147 | int type, struct tc_action *a) | |
e9ce1cd3 | 148 | { |
e9ce1cd3 | 149 | if (type == RTM_DELACTION) { |
c779f7af | 150 | return tcf_del_walker(skb, a); |
e9ce1cd3 | 151 | } else if (type == RTM_GETACTION) { |
c779f7af | 152 | return tcf_dump_walker(skb, cb, a); |
e9ce1cd3 | 153 | } else { |
6ff9c364 | 154 | WARN(1, "tcf_generic_walker: unknown action %d\n", type); |
e9ce1cd3 DM |
155 | return -EINVAL; |
156 | } | |
157 | } | |
e9ce1cd3 | 158 | |
6e6a50c2 | 159 | static struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo) |
e9ce1cd3 | 160 | { |
89819dc0 WC |
161 | struct tcf_common *p = NULL; |
162 | struct hlist_head *head; | |
e9ce1cd3 | 163 | |
89819dc0 WC |
164 | spin_lock_bh(&hinfo->lock); |
165 | head = &hinfo->htab[tcf_hash(index, hinfo->hmask)]; | |
166 | hlist_for_each_entry_rcu(p, head, tcfc_head) | |
e9ce1cd3 DM |
167 | if (p->tcfc_index == index) |
168 | break; | |
89819dc0 | 169 | spin_unlock_bh(&hinfo->lock); |
e9ce1cd3 DM |
170 | |
171 | return p; | |
172 | } | |
e9ce1cd3 | 173 | |
ddafd34f | 174 | u32 tcf_hash_new_index(struct tcf_hashinfo *hinfo) |
e9ce1cd3 | 175 | { |
ddafd34f | 176 | u32 val = hinfo->index; |
e9ce1cd3 DM |
177 | |
178 | do { | |
179 | if (++val == 0) | |
180 | val = 1; | |
181 | } while (tcf_hash_lookup(val, hinfo)); | |
182 | ||
ddafd34f | 183 | hinfo->index = val; |
17569fae | 184 | return val; |
e9ce1cd3 DM |
185 | } |
186 | EXPORT_SYMBOL(tcf_hash_new_index); | |
187 | ||
6e6a50c2 | 188 | int tcf_hash_search(struct tc_action *a, u32 index) |
e9ce1cd3 DM |
189 | { |
190 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
191 | struct tcf_common *p = tcf_hash_lookup(index, hinfo); | |
192 | ||
193 | if (p) { | |
194 | a->priv = p; | |
195 | return 1; | |
196 | } | |
197 | return 0; | |
198 | } | |
6e6a50c2 | 199 | EXPORT_SYMBOL(tcf_hash_search); |
e9ce1cd3 | 200 | |
c779f7af | 201 | struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind) |
e9ce1cd3 | 202 | { |
c779f7af | 203 | struct tcf_hashinfo *hinfo = a->ops->hinfo; |
e9ce1cd3 DM |
204 | struct tcf_common *p = NULL; |
205 | if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) { | |
76aab2c1 | 206 | if (bind) |
e9ce1cd3 | 207 | p->tcfc_bindcnt++; |
76aab2c1 | 208 | p->tcfc_refcnt++; |
e9ce1cd3 DM |
209 | a->priv = p; |
210 | } | |
211 | return p; | |
212 | } | |
213 | EXPORT_SYMBOL(tcf_hash_check); | |
214 | ||
0e991ec6 | 215 | struct tcf_common *tcf_hash_create(u32 index, struct nlattr *est, |
c779f7af | 216 | struct tc_action *a, int size, int bind) |
e9ce1cd3 | 217 | { |
c779f7af | 218 | struct tcf_hashinfo *hinfo = a->ops->hinfo; |
e9ce1cd3 DM |
219 | struct tcf_common *p = kzalloc(size, GFP_KERNEL); |
220 | ||
221 | if (unlikely(!p)) | |
0e991ec6 | 222 | return ERR_PTR(-ENOMEM); |
e9ce1cd3 DM |
223 | p->tcfc_refcnt = 1; |
224 | if (bind) | |
225 | p->tcfc_bindcnt = 1; | |
226 | ||
227 | spin_lock_init(&p->tcfc_lock); | |
89819dc0 | 228 | INIT_HLIST_NODE(&p->tcfc_head); |
ddafd34f | 229 | p->tcfc_index = index ? index : tcf_hash_new_index(hinfo); |
e9ce1cd3 DM |
230 | p->tcfc_tm.install = jiffies; |
231 | p->tcfc_tm.lastuse = jiffies; | |
0e991ec6 SH |
232 | if (est) { |
233 | int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est, | |
234 | &p->tcfc_lock, est); | |
235 | if (err) { | |
236 | kfree(p); | |
237 | return ERR_PTR(err); | |
238 | } | |
239 | } | |
240 | ||
e9ce1cd3 DM |
241 | a->priv = (void *) p; |
242 | return p; | |
243 | } | |
244 | EXPORT_SYMBOL(tcf_hash_create); | |
245 | ||
246 | void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo) | |
247 | { | |
248 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); | |
249 | ||
89819dc0 WC |
250 | spin_lock_bh(&hinfo->lock); |
251 | hlist_add_head(&p->tcfc_head, &hinfo->htab[h]); | |
252 | spin_unlock_bh(&hinfo->lock); | |
e9ce1cd3 DM |
253 | } |
254 | EXPORT_SYMBOL(tcf_hash_insert); | |
1da177e4 | 255 | |
1f747c26 | 256 | static LIST_HEAD(act_base); |
1da177e4 LT |
257 | static DEFINE_RWLOCK(act_mod_lock); |
258 | ||
259 | int tcf_register_action(struct tc_action_ops *act) | |
260 | { | |
1f747c26 | 261 | struct tc_action_ops *a; |
1da177e4 | 262 | |
76c82d7a JHS |
263 | /* Must supply act, dump, cleanup and init */ |
264 | if (!act->act || !act->dump || !act->cleanup || !act->init) | |
265 | return -EINVAL; | |
266 | ||
382ca8a1 | 267 | /* Supply defaults */ |
63ef6174 JHS |
268 | if (!act->lookup) |
269 | act->lookup = tcf_hash_search; | |
382ca8a1 JHS |
270 | if (!act->walk) |
271 | act->walk = tcf_generic_walker; | |
63ef6174 | 272 | |
1da177e4 | 273 | write_lock(&act_mod_lock); |
1f747c26 | 274 | list_for_each_entry(a, &act_base, head) { |
1da177e4 LT |
275 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { |
276 | write_unlock(&act_mod_lock); | |
277 | return -EEXIST; | |
278 | } | |
279 | } | |
1f747c26 | 280 | list_add_tail(&act->head, &act_base); |
1da177e4 LT |
281 | write_unlock(&act_mod_lock); |
282 | return 0; | |
283 | } | |
62e3ba1b | 284 | EXPORT_SYMBOL(tcf_register_action); |
1da177e4 LT |
285 | |
286 | int tcf_unregister_action(struct tc_action_ops *act) | |
287 | { | |
1f747c26 | 288 | struct tc_action_ops *a; |
1da177e4 LT |
289 | int err = -ENOENT; |
290 | ||
291 | write_lock(&act_mod_lock); | |
a792866a ED |
292 | list_for_each_entry(a, &act_base, head) { |
293 | if (a == act) { | |
294 | list_del(&act->head); | |
295 | err = 0; | |
1da177e4 | 296 | break; |
a792866a | 297 | } |
1da177e4 LT |
298 | } |
299 | write_unlock(&act_mod_lock); | |
300 | return err; | |
301 | } | |
62e3ba1b | 302 | EXPORT_SYMBOL(tcf_unregister_action); |
1da177e4 LT |
303 | |
304 | /* lookup by name */ | |
305 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
306 | { | |
a792866a | 307 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
308 | |
309 | if (kind) { | |
310 | read_lock(&act_mod_lock); | |
1f747c26 | 311 | list_for_each_entry(a, &act_base, head) { |
1da177e4 | 312 | if (strcmp(kind, a->kind) == 0) { |
a792866a ED |
313 | if (try_module_get(a->owner)) |
314 | res = a; | |
1da177e4 LT |
315 | break; |
316 | } | |
317 | } | |
318 | read_unlock(&act_mod_lock); | |
319 | } | |
a792866a | 320 | return res; |
1da177e4 LT |
321 | } |
322 | ||
7ba699c6 PM |
323 | /* lookup by nlattr */ |
324 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) | |
1da177e4 | 325 | { |
a792866a | 326 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
327 | |
328 | if (kind) { | |
329 | read_lock(&act_mod_lock); | |
1f747c26 | 330 | list_for_each_entry(a, &act_base, head) { |
7ba699c6 | 331 | if (nla_strcmp(kind, a->kind) == 0) { |
a792866a ED |
332 | if (try_module_get(a->owner)) |
333 | res = a; | |
1da177e4 LT |
334 | break; |
335 | } | |
336 | } | |
337 | read_unlock(&act_mod_lock); | |
338 | } | |
a792866a | 339 | return res; |
1da177e4 | 340 | } |
1da177e4 | 341 | |
33be6271 | 342 | int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions, |
10297b99 | 343 | struct tcf_result *res) |
1da177e4 | 344 | { |
dc7f9f6e | 345 | const struct tc_action *a; |
1da177e4 LT |
346 | int ret = -1; |
347 | ||
348 | if (skb->tc_verd & TC_NCLS) { | |
349 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
1da177e4 LT |
350 | ret = TC_ACT_OK; |
351 | goto exec_done; | |
352 | } | |
33be6271 | 353 | list_for_each_entry(a, actions, list) { |
1da177e4 | 354 | repeat: |
63acd680 JHS |
355 | ret = a->ops->act(skb, a, res); |
356 | if (TC_MUNGED & skb->tc_verd) { | |
357 | /* copied already, allow trampling */ | |
358 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); | |
359 | skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd); | |
1da177e4 | 360 | } |
63acd680 JHS |
361 | if (ret == TC_ACT_REPEAT) |
362 | goto repeat; /* we need a ttl - JHS */ | |
363 | if (ret != TC_ACT_PIPE) | |
364 | goto exec_done; | |
1da177e4 LT |
365 | } |
366 | exec_done: | |
1da177e4 LT |
367 | return ret; |
368 | } | |
62e3ba1b | 369 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 | 370 | |
33be6271 | 371 | void tcf_action_destroy(struct list_head *actions, int bind) |
1da177e4 | 372 | { |
33be6271 | 373 | struct tc_action *a, *tmp; |
1da177e4 | 374 | |
33be6271 | 375 | list_for_each_entry_safe(a, tmp, actions, list) { |
63acd680 JHS |
376 | if (a->ops->cleanup(a, bind) == ACT_P_DELETED) |
377 | module_put(a->ops->owner); | |
378 | list_del(&a->list); | |
379 | kfree(a); | |
1da177e4 LT |
380 | } |
381 | } | |
382 | ||
383 | int | |
384 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
385 | { | |
1da177e4 LT |
386 | return a->ops->dump(skb, a, bind, ref); |
387 | } | |
388 | ||
389 | int | |
390 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
391 | { | |
392 | int err = -EINVAL; | |
27a884dc | 393 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 394 | struct nlattr *nest; |
1da177e4 | 395 | |
1b34ec43 DM |
396 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) |
397 | goto nla_put_failure; | |
1da177e4 | 398 | if (tcf_action_copy_stats(skb, a, 0)) |
7ba699c6 | 399 | goto nla_put_failure; |
4b3550ef PM |
400 | nest = nla_nest_start(skb, TCA_OPTIONS); |
401 | if (nest == NULL) | |
402 | goto nla_put_failure; | |
cc7ec456 ED |
403 | err = tcf_action_dump_old(skb, a, bind, ref); |
404 | if (err > 0) { | |
4b3550ef | 405 | nla_nest_end(skb, nest); |
1da177e4 LT |
406 | return err; |
407 | } | |
408 | ||
7ba699c6 | 409 | nla_put_failure: |
dc5fc579 | 410 | nlmsg_trim(skb, b); |
1da177e4 LT |
411 | return -1; |
412 | } | |
62e3ba1b | 413 | EXPORT_SYMBOL(tcf_action_dump_1); |
1da177e4 LT |
414 | |
415 | int | |
33be6271 | 416 | tcf_action_dump(struct sk_buff *skb, struct list_head *actions, int bind, int ref) |
1da177e4 LT |
417 | { |
418 | struct tc_action *a; | |
419 | int err = -EINVAL; | |
4b3550ef | 420 | struct nlattr *nest; |
1da177e4 | 421 | |
33be6271 | 422 | list_for_each_entry(a, actions, list) { |
4b3550ef PM |
423 | nest = nla_nest_start(skb, a->order); |
424 | if (nest == NULL) | |
425 | goto nla_put_failure; | |
1da177e4 LT |
426 | err = tcf_action_dump_1(skb, a, bind, ref); |
427 | if (err < 0) | |
4fe683f5 | 428 | goto errout; |
4b3550ef | 429 | nla_nest_end(skb, nest); |
1da177e4 LT |
430 | } |
431 | ||
432 | return 0; | |
433 | ||
7ba699c6 | 434 | nla_put_failure: |
4fe683f5 TG |
435 | err = -EINVAL; |
436 | errout: | |
4b3550ef | 437 | nla_nest_cancel(skb, nest); |
4fe683f5 | 438 | return err; |
1da177e4 LT |
439 | } |
440 | ||
c1b52739 BL |
441 | struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla, |
442 | struct nlattr *est, char *name, int ovr, | |
443 | int bind) | |
1da177e4 LT |
444 | { |
445 | struct tc_action *a; | |
446 | struct tc_action_ops *a_o; | |
447 | char act_name[IFNAMSIZ]; | |
cc7ec456 | 448 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 449 | struct nlattr *kind; |
ab27cfb8 | 450 | int err; |
1da177e4 | 451 | |
1da177e4 | 452 | if (name == NULL) { |
cee63723 PM |
453 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
454 | if (err < 0) | |
1da177e4 | 455 | goto err_out; |
cee63723 | 456 | err = -EINVAL; |
7ba699c6 | 457 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
458 | if (kind == NULL) |
459 | goto err_out; | |
7ba699c6 | 460 | if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) |
1da177e4 LT |
461 | goto err_out; |
462 | } else { | |
cee63723 | 463 | err = -EINVAL; |
1da177e4 LT |
464 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) |
465 | goto err_out; | |
466 | } | |
467 | ||
468 | a_o = tc_lookup_action_n(act_name); | |
469 | if (a_o == NULL) { | |
95a5afca | 470 | #ifdef CONFIG_MODULES |
1da177e4 | 471 | rtnl_unlock(); |
4bba3925 | 472 | request_module("act_%s", act_name); |
1da177e4 LT |
473 | rtnl_lock(); |
474 | ||
475 | a_o = tc_lookup_action_n(act_name); | |
476 | ||
477 | /* We dropped the RTNL semaphore in order to | |
478 | * perform the module load. So, even if we | |
479 | * succeeded in loading the module we have to | |
480 | * tell the caller to replay the request. We | |
481 | * indicate this using -EAGAIN. | |
482 | */ | |
483 | if (a_o != NULL) { | |
ab27cfb8 | 484 | err = -EAGAIN; |
1da177e4 LT |
485 | goto err_mod; |
486 | } | |
487 | #endif | |
ab27cfb8 | 488 | err = -ENOENT; |
1da177e4 LT |
489 | goto err_out; |
490 | } | |
491 | ||
ab27cfb8 | 492 | err = -ENOMEM; |
0da974f4 | 493 | a = kzalloc(sizeof(*a), GFP_KERNEL); |
1da177e4 LT |
494 | if (a == NULL) |
495 | goto err_mod; | |
1da177e4 | 496 | |
c779f7af | 497 | a->ops = a_o; |
33be6271 | 498 | INIT_LIST_HEAD(&a->list); |
1da177e4 LT |
499 | /* backward compatibility for policer */ |
500 | if (name == NULL) | |
c1b52739 | 501 | err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, a, ovr, bind); |
1da177e4 | 502 | else |
c1b52739 | 503 | err = a_o->init(net, nla, est, a, ovr, bind); |
ab27cfb8 | 504 | if (err < 0) |
1da177e4 LT |
505 | goto err_free; |
506 | ||
507 | /* module count goes up only when brand new policy is created | |
cc7ec456 ED |
508 | * if it exists and is only bound to in a_o->init() then |
509 | * ACT_P_CREATED is not returned (a zero is). | |
510 | */ | |
ab27cfb8 | 511 | if (err != ACT_P_CREATED) |
1da177e4 | 512 | module_put(a_o->owner); |
1da177e4 | 513 | |
1da177e4 LT |
514 | return a; |
515 | ||
516 | err_free: | |
517 | kfree(a); | |
518 | err_mod: | |
519 | module_put(a_o->owner); | |
520 | err_out: | |
ab27cfb8 | 521 | return ERR_PTR(err); |
1da177e4 LT |
522 | } |
523 | ||
33be6271 | 524 | int tcf_action_init(struct net *net, struct nlattr *nla, |
c1b52739 | 525 | struct nlattr *est, char *name, int ovr, |
33be6271 | 526 | int bind, struct list_head *actions) |
1da177e4 | 527 | { |
cc7ec456 | 528 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 | 529 | struct tc_action *act; |
cee63723 | 530 | int err; |
1da177e4 LT |
531 | int i; |
532 | ||
cee63723 PM |
533 | err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
534 | if (err < 0) | |
33be6271 | 535 | return err; |
1da177e4 | 536 | |
7ba699c6 | 537 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
c1b52739 | 538 | act = tcf_action_init_1(net, tb[i], est, name, ovr, bind); |
33be6271 WC |
539 | if (IS_ERR(act)) { |
540 | err = PTR_ERR(act); | |
1da177e4 | 541 | goto err; |
33be6271 | 542 | } |
7ba699c6 | 543 | act->order = i; |
33be6271 | 544 | list_add_tail(&act->list, actions); |
1da177e4 | 545 | } |
33be6271 | 546 | return 0; |
1da177e4 LT |
547 | |
548 | err: | |
33be6271 WC |
549 | tcf_action_destroy(actions, bind); |
550 | return err; | |
1da177e4 LT |
551 | } |
552 | ||
553 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a, | |
554 | int compat_mode) | |
555 | { | |
556 | int err = 0; | |
557 | struct gnet_dump d; | |
7eb8896d | 558 | struct tcf_common *p = a->priv; |
10297b99 | 559 | |
7eb8896d | 560 | if (p == NULL) |
1da177e4 LT |
561 | goto errout; |
562 | ||
563 | /* compat_mode being true specifies a call that is supposed | |
06fe9fb4 | 564 | * to add additional backward compatibility statistic TLVs. |
1da177e4 LT |
565 | */ |
566 | if (compat_mode) { | |
567 | if (a->type == TCA_OLD_COMPAT) | |
568 | err = gnet_stats_start_copy_compat(skb, 0, | |
7eb8896d | 569 | TCA_STATS, TCA_XSTATS, &p->tcfc_lock, &d); |
1da177e4 LT |
570 | else |
571 | return 0; | |
572 | } else | |
573 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
7eb8896d | 574 | &p->tcfc_lock, &d); |
1da177e4 LT |
575 | |
576 | if (err < 0) | |
577 | goto errout; | |
578 | ||
7eb8896d WC |
579 | if (gnet_stats_copy_basic(&d, &p->tcfc_bstats) < 0 || |
580 | gnet_stats_copy_rate_est(&d, &p->tcfc_bstats, | |
581 | &p->tcfc_rate_est) < 0 || | |
582 | gnet_stats_copy_queue(&d, &p->tcfc_qstats) < 0) | |
1da177e4 LT |
583 | goto errout; |
584 | ||
585 | if (gnet_stats_finish_copy(&d) < 0) | |
586 | goto errout; | |
587 | ||
588 | return 0; | |
589 | ||
590 | errout: | |
591 | return -1; | |
592 | } | |
593 | ||
594 | static int | |
33be6271 | 595 | tca_get_fill(struct sk_buff *skb, struct list_head *actions, u32 portid, u32 seq, |
10297b99 | 596 | u16 flags, int event, int bind, int ref) |
1da177e4 LT |
597 | { |
598 | struct tcamsg *t; | |
599 | struct nlmsghdr *nlh; | |
27a884dc | 600 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 601 | struct nlattr *nest; |
1da177e4 | 602 | |
15e47304 | 603 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags); |
8b00a53c DM |
604 | if (!nlh) |
605 | goto out_nlmsg_trim; | |
606 | t = nlmsg_data(nlh); | |
1da177e4 | 607 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
608 | t->tca__pad1 = 0; |
609 | t->tca__pad2 = 0; | |
10297b99 | 610 | |
4b3550ef PM |
611 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
612 | if (nest == NULL) | |
8b00a53c | 613 | goto out_nlmsg_trim; |
1da177e4 | 614 | |
33be6271 | 615 | if (tcf_action_dump(skb, actions, bind, ref) < 0) |
8b00a53c | 616 | goto out_nlmsg_trim; |
1da177e4 | 617 | |
4b3550ef | 618 | nla_nest_end(skb, nest); |
10297b99 | 619 | |
27a884dc | 620 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
621 | return skb->len; |
622 | ||
8b00a53c | 623 | out_nlmsg_trim: |
dc5fc579 | 624 | nlmsg_trim(skb, b); |
1da177e4 LT |
625 | return -1; |
626 | } | |
627 | ||
628 | static int | |
15e47304 | 629 | act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n, |
33be6271 | 630 | struct list_head *actions, int event) |
1da177e4 LT |
631 | { |
632 | struct sk_buff *skb; | |
1da177e4 LT |
633 | |
634 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
635 | if (!skb) | |
636 | return -ENOBUFS; | |
33be6271 | 637 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { |
1da177e4 LT |
638 | kfree_skb(skb); |
639 | return -EINVAL; | |
640 | } | |
2942e900 | 641 | |
15e47304 | 642 | return rtnl_unicast(skb, net, portid); |
1da177e4 LT |
643 | } |
644 | ||
645 | static struct tc_action * | |
15e47304 | 646 | tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 portid) |
1da177e4 | 647 | { |
cc7ec456 | 648 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
1da177e4 LT |
649 | struct tc_action *a; |
650 | int index; | |
ab27cfb8 | 651 | int err; |
1da177e4 | 652 | |
cee63723 PM |
653 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
654 | if (err < 0) | |
ab27cfb8 | 655 | goto err_out; |
1da177e4 | 656 | |
cee63723 | 657 | err = -EINVAL; |
7ba699c6 PM |
658 | if (tb[TCA_ACT_INDEX] == NULL || |
659 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) | |
ab27cfb8 | 660 | goto err_out; |
1587bac4 | 661 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 662 | |
ab27cfb8 | 663 | err = -ENOMEM; |
0da974f4 | 664 | a = kzalloc(sizeof(struct tc_action), GFP_KERNEL); |
1da177e4 | 665 | if (a == NULL) |
ab27cfb8 | 666 | goto err_out; |
1da177e4 | 667 | |
33be6271 | 668 | INIT_LIST_HEAD(&a->list); |
ab27cfb8 | 669 | err = -EINVAL; |
7ba699c6 | 670 | a->ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
63acd680 | 671 | if (a->ops == NULL) /* could happen in batch of actions */ |
1da177e4 | 672 | goto err_free; |
ab27cfb8 | 673 | err = -ENOENT; |
1da177e4 LT |
674 | if (a->ops->lookup(a, index) == 0) |
675 | goto err_mod; | |
676 | ||
677 | module_put(a->ops->owner); | |
1da177e4 | 678 | return a; |
ab27cfb8 | 679 | |
1da177e4 LT |
680 | err_mod: |
681 | module_put(a->ops->owner); | |
682 | err_free: | |
683 | kfree(a); | |
ab27cfb8 PM |
684 | err_out: |
685 | return ERR_PTR(err); | |
1da177e4 LT |
686 | } |
687 | ||
33be6271 | 688 | static void cleanup_a(struct list_head *actions) |
1da177e4 | 689 | { |
33be6271 | 690 | struct tc_action *a, *tmp; |
1da177e4 | 691 | |
33be6271 WC |
692 | list_for_each_entry_safe(a, tmp, actions, list) { |
693 | list_del(&a->list); | |
1da177e4 LT |
694 | kfree(a); |
695 | } | |
696 | } | |
697 | ||
698 | static struct tc_action *create_a(int i) | |
699 | { | |
700 | struct tc_action *act; | |
701 | ||
0da974f4 | 702 | act = kzalloc(sizeof(*act), GFP_KERNEL); |
1da177e4 | 703 | if (act == NULL) { |
6ff9c364 | 704 | pr_debug("create_a: failed to alloc!\n"); |
1da177e4 LT |
705 | return NULL; |
706 | } | |
1da177e4 | 707 | act->order = i; |
33be6271 | 708 | INIT_LIST_HEAD(&act->list); |
1da177e4 LT |
709 | return act; |
710 | } | |
711 | ||
7316ae88 | 712 | static int tca_action_flush(struct net *net, struct nlattr *nla, |
15e47304 | 713 | struct nlmsghdr *n, u32 portid) |
1da177e4 LT |
714 | { |
715 | struct sk_buff *skb; | |
716 | unsigned char *b; | |
717 | struct nlmsghdr *nlh; | |
718 | struct tcamsg *t; | |
719 | struct netlink_callback dcb; | |
4b3550ef | 720 | struct nlattr *nest; |
cc7ec456 | 721 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 722 | struct nlattr *kind; |
1da177e4 | 723 | struct tc_action *a = create_a(0); |
36723873 | 724 | int err = -ENOMEM; |
1da177e4 LT |
725 | |
726 | if (a == NULL) { | |
6ff9c364 | 727 | pr_debug("tca_action_flush: couldnt create tc_action\n"); |
1da177e4 LT |
728 | return err; |
729 | } | |
730 | ||
731 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
732 | if (!skb) { | |
6ff9c364 | 733 | pr_debug("tca_action_flush: failed skb alloc\n"); |
1da177e4 | 734 | kfree(a); |
36723873 | 735 | return err; |
1da177e4 LT |
736 | } |
737 | ||
27a884dc | 738 | b = skb_tail_pointer(skb); |
1da177e4 | 739 | |
cee63723 PM |
740 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
741 | if (err < 0) | |
1da177e4 LT |
742 | goto err_out; |
743 | ||
cee63723 | 744 | err = -EINVAL; |
7ba699c6 | 745 | kind = tb[TCA_ACT_KIND]; |
1da177e4 | 746 | a->ops = tc_lookup_action(kind); |
63acd680 | 747 | if (a->ops == NULL) /*some idjot trying to flush unknown action */ |
1da177e4 LT |
748 | goto err_out; |
749 | ||
15e47304 | 750 | nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t), 0); |
8b00a53c DM |
751 | if (!nlh) |
752 | goto out_module_put; | |
753 | t = nlmsg_data(nlh); | |
1da177e4 | 754 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
755 | t->tca__pad1 = 0; |
756 | t->tca__pad2 = 0; | |
1da177e4 | 757 | |
4b3550ef PM |
758 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
759 | if (nest == NULL) | |
8b00a53c | 760 | goto out_module_put; |
1da177e4 LT |
761 | |
762 | err = a->ops->walk(skb, &dcb, RTM_DELACTION, a); | |
763 | if (err < 0) | |
8b00a53c | 764 | goto out_module_put; |
f97017cd JHS |
765 | if (err == 0) |
766 | goto noflush_out; | |
1da177e4 | 767 | |
4b3550ef | 768 | nla_nest_end(skb, nest); |
1da177e4 | 769 | |
27a884dc | 770 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
771 | nlh->nlmsg_flags |= NLM_F_ROOT; |
772 | module_put(a->ops->owner); | |
773 | kfree(a); | |
15e47304 | 774 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 775 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
776 | if (err > 0) |
777 | return 0; | |
778 | ||
779 | return err; | |
780 | ||
8b00a53c | 781 | out_module_put: |
ebbaeab1 | 782 | module_put(a->ops->owner); |
1da177e4 | 783 | err_out: |
f97017cd | 784 | noflush_out: |
1da177e4 LT |
785 | kfree_skb(skb); |
786 | kfree(a); | |
787 | return err; | |
788 | } | |
789 | ||
a56e1953 WC |
790 | static int |
791 | tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions, | |
792 | u32 portid) | |
793 | { | |
794 | int ret; | |
795 | struct sk_buff *skb; | |
796 | ||
797 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
798 | if (!skb) | |
799 | return -ENOBUFS; | |
800 | ||
801 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION, | |
802 | 0, 1) <= 0) { | |
803 | kfree_skb(skb); | |
804 | return -EINVAL; | |
805 | } | |
806 | ||
807 | /* now do the delete */ | |
808 | tcf_action_destroy(actions, 0); | |
809 | ||
810 | ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
811 | n->nlmsg_flags & NLM_F_ECHO); | |
812 | if (ret > 0) | |
813 | return 0; | |
814 | return ret; | |
815 | } | |
816 | ||
1da177e4 | 817 | static int |
7316ae88 | 818 | tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
15e47304 | 819 | u32 portid, int event) |
1da177e4 | 820 | { |
cee63723 | 821 | int i, ret; |
cc7ec456 | 822 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 WC |
823 | struct tc_action *act; |
824 | LIST_HEAD(actions); | |
1da177e4 | 825 | |
cee63723 PM |
826 | ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
827 | if (ret < 0) | |
828 | return ret; | |
1da177e4 | 829 | |
cc7ec456 | 830 | if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) { |
f97017cd | 831 | if (tb[1] != NULL) |
15e47304 | 832 | return tca_action_flush(net, tb[1], n, portid); |
f97017cd JHS |
833 | else |
834 | return -EINVAL; | |
1da177e4 LT |
835 | } |
836 | ||
7ba699c6 | 837 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
15e47304 | 838 | act = tcf_action_get_1(tb[i], n, portid); |
ab27cfb8 PM |
839 | if (IS_ERR(act)) { |
840 | ret = PTR_ERR(act); | |
1da177e4 | 841 | goto err; |
ab27cfb8 | 842 | } |
7ba699c6 | 843 | act->order = i; |
33be6271 | 844 | list_add_tail(&act->list, &actions); |
1da177e4 LT |
845 | } |
846 | ||
847 | if (event == RTM_GETACTION) | |
33be6271 | 848 | ret = act_get_notify(net, portid, n, &actions, event); |
1da177e4 | 849 | else { /* delete */ |
a56e1953 WC |
850 | ret = tcf_del_notify(net, n, &actions, portid); |
851 | if (ret) | |
1da177e4 | 852 | goto err; |
1da177e4 LT |
853 | return ret; |
854 | } | |
855 | err: | |
33be6271 | 856 | cleanup_a(&actions); |
1da177e4 LT |
857 | return ret; |
858 | } | |
859 | ||
a56e1953 WC |
860 | static int |
861 | tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions, | |
862 | u32 portid) | |
1da177e4 | 863 | { |
1da177e4 | 864 | struct sk_buff *skb; |
1da177e4 LT |
865 | int err = 0; |
866 | ||
867 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
868 | if (!skb) | |
869 | return -ENOBUFS; | |
870 | ||
a56e1953 WC |
871 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags, |
872 | RTM_NEWACTION, 0, 0) <= 0) { | |
873 | kfree_skb(skb); | |
874 | return -EINVAL; | |
875 | } | |
10297b99 | 876 | |
a56e1953 WC |
877 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
878 | n->nlmsg_flags & NLM_F_ECHO); | |
1da177e4 LT |
879 | if (err > 0) |
880 | err = 0; | |
881 | return err; | |
1da177e4 LT |
882 | } |
883 | ||
1da177e4 | 884 | static int |
7316ae88 | 885 | tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
15e47304 | 886 | u32 portid, int ovr) |
1da177e4 LT |
887 | { |
888 | int ret = 0; | |
33be6271 | 889 | LIST_HEAD(actions); |
1da177e4 | 890 | |
33be6271 WC |
891 | ret = tcf_action_init(net, nla, NULL, NULL, ovr, 0, &actions); |
892 | if (ret) | |
ab27cfb8 | 893 | goto done; |
1da177e4 LT |
894 | |
895 | /* dump then free all the actions after update; inserted policy | |
896 | * stays intact | |
cc7ec456 | 897 | */ |
a56e1953 | 898 | ret = tcf_add_notify(net, n, &actions, portid); |
33be6271 | 899 | cleanup_a(&actions); |
1da177e4 LT |
900 | done: |
901 | return ret; | |
902 | } | |
903 | ||
661d2967 | 904 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 905 | { |
3b1e0a65 | 906 | struct net *net = sock_net(skb->sk); |
7ba699c6 | 907 | struct nlattr *tca[TCA_ACT_MAX + 1]; |
15e47304 | 908 | u32 portid = skb ? NETLINK_CB(skb).portid : 0; |
1da177e4 LT |
909 | int ret = 0, ovr = 0; |
910 | ||
dfc47ef8 EB |
911 | if ((n->nlmsg_type != RTM_GETACTION) && !capable(CAP_NET_ADMIN)) |
912 | return -EPERM; | |
913 | ||
7ba699c6 PM |
914 | ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL); |
915 | if (ret < 0) | |
916 | return ret; | |
917 | ||
918 | if (tca[TCA_ACT_TAB] == NULL) { | |
6ff9c364 | 919 | pr_notice("tc_ctl_action: received NO action attribs\n"); |
1da177e4 LT |
920 | return -EINVAL; |
921 | } | |
922 | ||
cc7ec456 | 923 | /* n->nlmsg_flags & NLM_F_CREATE */ |
1da177e4 LT |
924 | switch (n->nlmsg_type) { |
925 | case RTM_NEWACTION: | |
926 | /* we are going to assume all other flags | |
25985edc | 927 | * imply create only if it doesn't exist |
1da177e4 LT |
928 | * Note that CREATE | EXCL implies that |
929 | * but since we want avoid ambiguity (eg when flags | |
930 | * is zero) then just set this | |
931 | */ | |
cc7ec456 | 932 | if (n->nlmsg_flags & NLM_F_REPLACE) |
1da177e4 LT |
933 | ovr = 1; |
934 | replay: | |
15e47304 | 935 | ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr); |
1da177e4 LT |
936 | if (ret == -EAGAIN) |
937 | goto replay; | |
938 | break; | |
939 | case RTM_DELACTION: | |
7316ae88 | 940 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
15e47304 | 941 | portid, RTM_DELACTION); |
1da177e4 LT |
942 | break; |
943 | case RTM_GETACTION: | |
7316ae88 | 944 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
15e47304 | 945 | portid, RTM_GETACTION); |
1da177e4 LT |
946 | break; |
947 | default: | |
948 | BUG(); | |
949 | } | |
950 | ||
951 | return ret; | |
952 | } | |
953 | ||
7ba699c6 | 954 | static struct nlattr * |
3a6c2b41 | 955 | find_dump_kind(const struct nlmsghdr *n) |
1da177e4 | 956 | { |
cc7ec456 | 957 | struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1]; |
7ba699c6 PM |
958 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
959 | struct nlattr *nla[TCAA_MAX + 1]; | |
960 | struct nlattr *kind; | |
1da177e4 | 961 | |
c96c9471 | 962 | if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0) |
1da177e4 | 963 | return NULL; |
7ba699c6 | 964 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
965 | if (tb1 == NULL) |
966 | return NULL; | |
967 | ||
7ba699c6 PM |
968 | if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), |
969 | NLMSG_ALIGN(nla_len(tb1)), NULL) < 0) | |
1da177e4 | 970 | return NULL; |
1da177e4 | 971 | |
6d834e04 PM |
972 | if (tb[1] == NULL) |
973 | return NULL; | |
974 | if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]), | |
975 | nla_len(tb[1]), NULL) < 0) | |
1da177e4 | 976 | return NULL; |
7ba699c6 | 977 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 978 | |
26dab893 | 979 | return kind; |
1da177e4 LT |
980 | } |
981 | ||
982 | static int | |
983 | tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) | |
984 | { | |
985 | struct nlmsghdr *nlh; | |
27a884dc | 986 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 987 | struct nlattr *nest; |
1da177e4 LT |
988 | struct tc_action_ops *a_o; |
989 | struct tc_action a; | |
990 | int ret = 0; | |
8b00a53c | 991 | struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh); |
7ba699c6 | 992 | struct nlattr *kind = find_dump_kind(cb->nlh); |
1da177e4 LT |
993 | |
994 | if (kind == NULL) { | |
6ff9c364 | 995 | pr_info("tc_dump_action: action bad kind\n"); |
1da177e4 LT |
996 | return 0; |
997 | } | |
998 | ||
26dab893 | 999 | a_o = tc_lookup_action(kind); |
cc7ec456 | 1000 | if (a_o == NULL) |
1da177e4 | 1001 | return 0; |
1da177e4 LT |
1002 | |
1003 | memset(&a, 0, sizeof(struct tc_action)); | |
1004 | a.ops = a_o; | |
1005 | ||
15e47304 | 1006 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
8b00a53c DM |
1007 | cb->nlh->nlmsg_type, sizeof(*t), 0); |
1008 | if (!nlh) | |
1009 | goto out_module_put; | |
1010 | t = nlmsg_data(nlh); | |
1da177e4 | 1011 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1012 | t->tca__pad1 = 0; |
1013 | t->tca__pad2 = 0; | |
1da177e4 | 1014 | |
4b3550ef PM |
1015 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
1016 | if (nest == NULL) | |
8b00a53c | 1017 | goto out_module_put; |
1da177e4 LT |
1018 | |
1019 | ret = a_o->walk(skb, cb, RTM_GETACTION, &a); | |
1020 | if (ret < 0) | |
8b00a53c | 1021 | goto out_module_put; |
1da177e4 LT |
1022 | |
1023 | if (ret > 0) { | |
4b3550ef | 1024 | nla_nest_end(skb, nest); |
1da177e4 LT |
1025 | ret = skb->len; |
1026 | } else | |
4b3550ef | 1027 | nla_nest_cancel(skb, nest); |
1da177e4 | 1028 | |
27a884dc | 1029 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
15e47304 | 1030 | if (NETLINK_CB(cb->skb).portid && ret) |
1da177e4 LT |
1031 | nlh->nlmsg_flags |= NLM_F_MULTI; |
1032 | module_put(a_o->owner); | |
1033 | return skb->len; | |
1034 | ||
8b00a53c | 1035 | out_module_put: |
1da177e4 | 1036 | module_put(a_o->owner); |
dc5fc579 | 1037 | nlmsg_trim(skb, b); |
1da177e4 LT |
1038 | return skb->len; |
1039 | } | |
1040 | ||
1041 | static int __init tc_action_init(void) | |
1042 | { | |
c7ac8679 GR |
1043 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL); |
1044 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL); | |
1045 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, | |
1046 | NULL); | |
1da177e4 | 1047 | |
1da177e4 LT |
1048 | return 0; |
1049 | } | |
1050 | ||
1051 | subsys_initcall(tc_action_init); |