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 | |
86062033 | 30 | void tcf_hash_destroy(struct tc_action *a) |
e9ce1cd3 | 31 | { |
86062033 WC |
32 | struct tcf_common *p = a->priv; |
33 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
34 | ||
89819dc0 WC |
35 | spin_lock_bh(&hinfo->lock); |
36 | hlist_del(&p->tcfc_head); | |
37 | spin_unlock_bh(&hinfo->lock); | |
38 | gen_kill_estimator(&p->tcfc_bstats, | |
39 | &p->tcfc_rate_est); | |
40 | /* | |
41 | * gen_estimator est_timer() might access p->tcfc_lock | |
42 | * or bstats, wait a RCU grace period before freeing p | |
43 | */ | |
44 | kfree_rcu(p, tcfc_rcu); | |
e9ce1cd3 DM |
45 | } |
46 | EXPORT_SYMBOL(tcf_hash_destroy); | |
47 | ||
86062033 | 48 | int tcf_hash_release(struct tc_action *a, int bind) |
e9ce1cd3 | 49 | { |
86062033 | 50 | struct tcf_common *p = a->priv; |
e9ce1cd3 DM |
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) { |
86062033 | 59 | tcf_hash_destroy(a); |
e9ce1cd3 DM |
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, | |
c779f7af | 68 | struct tc_action *a) |
e9ce1cd3 | 69 | { |
c779f7af | 70 | struct tcf_hashinfo *hinfo = a->ops->hinfo; |
89819dc0 | 71 | struct hlist_head *head; |
e9ce1cd3 | 72 | struct tcf_common *p; |
cc7ec456 | 73 | int err = 0, index = -1, i = 0, s_i = 0, n_i = 0; |
4b3550ef | 74 | struct nlattr *nest; |
e9ce1cd3 | 75 | |
89819dc0 | 76 | spin_lock_bh(&hinfo->lock); |
e9ce1cd3 DM |
77 | |
78 | s_i = cb->args[0]; | |
79 | ||
80 | for (i = 0; i < (hinfo->hmask + 1); i++) { | |
89819dc0 | 81 | head = &hinfo->htab[tcf_hash(i, hinfo->hmask)]; |
e9ce1cd3 | 82 | |
89819dc0 | 83 | hlist_for_each_entry_rcu(p, head, tcfc_head) { |
e9ce1cd3 DM |
84 | index++; |
85 | if (index < s_i) | |
86 | continue; | |
87 | a->priv = p; | |
88 | a->order = n_i; | |
4b3550ef PM |
89 | |
90 | nest = nla_nest_start(skb, a->order); | |
91 | if (nest == NULL) | |
92 | goto nla_put_failure; | |
e9ce1cd3 DM |
93 | err = tcf_action_dump_1(skb, a, 0, 0); |
94 | if (err < 0) { | |
95 | index--; | |
4b3550ef | 96 | nlmsg_trim(skb, nest); |
e9ce1cd3 DM |
97 | goto done; |
98 | } | |
4b3550ef | 99 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
100 | n_i++; |
101 | if (n_i >= TCA_ACT_MAX_PRIO) | |
102 | goto done; | |
103 | } | |
104 | } | |
105 | done: | |
89819dc0 | 106 | spin_unlock_bh(&hinfo->lock); |
e9ce1cd3 DM |
107 | if (n_i) |
108 | cb->args[0] += n_i; | |
109 | return n_i; | |
110 | ||
7ba699c6 | 111 | nla_put_failure: |
4b3550ef | 112 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
113 | goto done; |
114 | } | |
115 | ||
c779f7af | 116 | static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a) |
e9ce1cd3 | 117 | { |
c779f7af | 118 | struct tcf_hashinfo *hinfo = a->ops->hinfo; |
89819dc0 WC |
119 | struct hlist_head *head; |
120 | struct hlist_node *n; | |
121 | struct tcf_common *p; | |
4b3550ef | 122 | struct nlattr *nest; |
cc7ec456 | 123 | int i = 0, n_i = 0; |
e9ce1cd3 | 124 | |
4b3550ef PM |
125 | nest = nla_nest_start(skb, a->order); |
126 | if (nest == NULL) | |
127 | goto nla_put_failure; | |
1b34ec43 DM |
128 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) |
129 | goto nla_put_failure; | |
e9ce1cd3 | 130 | for (i = 0; i < (hinfo->hmask + 1); i++) { |
89819dc0 WC |
131 | head = &hinfo->htab[tcf_hash(i, hinfo->hmask)]; |
132 | hlist_for_each_entry_safe(p, n, head, tcfc_head) { | |
86062033 WC |
133 | a->priv = p; |
134 | if (ACT_P_DELETED == tcf_hash_release(a, 0)) { | |
cc7ec456 | 135 | module_put(a->ops->owner); |
805c1f4a JHS |
136 | n_i++; |
137 | } | |
e9ce1cd3 DM |
138 | } |
139 | } | |
1b34ec43 DM |
140 | if (nla_put_u32(skb, TCA_FCNT, n_i)) |
141 | goto nla_put_failure; | |
4b3550ef | 142 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
143 | |
144 | return n_i; | |
7ba699c6 | 145 | nla_put_failure: |
4b3550ef | 146 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
147 | return -EINVAL; |
148 | } | |
149 | ||
9c75f402 | 150 | static int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb, |
151 | int type, struct tc_action *a) | |
e9ce1cd3 | 152 | { |
e9ce1cd3 | 153 | if (type == RTM_DELACTION) { |
c779f7af | 154 | return tcf_del_walker(skb, a); |
e9ce1cd3 | 155 | } else if (type == RTM_GETACTION) { |
c779f7af | 156 | return tcf_dump_walker(skb, cb, a); |
e9ce1cd3 | 157 | } else { |
6ff9c364 | 158 | WARN(1, "tcf_generic_walker: unknown action %d\n", type); |
e9ce1cd3 DM |
159 | return -EINVAL; |
160 | } | |
161 | } | |
e9ce1cd3 | 162 | |
6e6a50c2 | 163 | static struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo) |
e9ce1cd3 | 164 | { |
89819dc0 WC |
165 | struct tcf_common *p = NULL; |
166 | struct hlist_head *head; | |
e9ce1cd3 | 167 | |
89819dc0 WC |
168 | spin_lock_bh(&hinfo->lock); |
169 | head = &hinfo->htab[tcf_hash(index, hinfo->hmask)]; | |
170 | hlist_for_each_entry_rcu(p, head, tcfc_head) | |
e9ce1cd3 DM |
171 | if (p->tcfc_index == index) |
172 | break; | |
89819dc0 | 173 | spin_unlock_bh(&hinfo->lock); |
e9ce1cd3 DM |
174 | |
175 | return p; | |
176 | } | |
e9ce1cd3 | 177 | |
ddafd34f | 178 | u32 tcf_hash_new_index(struct tcf_hashinfo *hinfo) |
e9ce1cd3 | 179 | { |
ddafd34f | 180 | u32 val = hinfo->index; |
e9ce1cd3 DM |
181 | |
182 | do { | |
183 | if (++val == 0) | |
184 | val = 1; | |
185 | } while (tcf_hash_lookup(val, hinfo)); | |
186 | ||
ddafd34f | 187 | hinfo->index = val; |
17569fae | 188 | return val; |
e9ce1cd3 DM |
189 | } |
190 | EXPORT_SYMBOL(tcf_hash_new_index); | |
191 | ||
6e6a50c2 | 192 | int tcf_hash_search(struct tc_action *a, u32 index) |
e9ce1cd3 DM |
193 | { |
194 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
195 | struct tcf_common *p = tcf_hash_lookup(index, hinfo); | |
196 | ||
197 | if (p) { | |
198 | a->priv = p; | |
199 | return 1; | |
200 | } | |
201 | return 0; | |
202 | } | |
6e6a50c2 | 203 | EXPORT_SYMBOL(tcf_hash_search); |
e9ce1cd3 | 204 | |
86062033 | 205 | int tcf_hash_check(u32 index, struct tc_action *a, int bind) |
e9ce1cd3 | 206 | { |
c779f7af | 207 | struct tcf_hashinfo *hinfo = a->ops->hinfo; |
e9ce1cd3 DM |
208 | struct tcf_common *p = NULL; |
209 | if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) { | |
76aab2c1 | 210 | if (bind) |
e9ce1cd3 | 211 | p->tcfc_bindcnt++; |
76aab2c1 | 212 | p->tcfc_refcnt++; |
e9ce1cd3 | 213 | a->priv = p; |
86062033 | 214 | return 1; |
e9ce1cd3 | 215 | } |
86062033 | 216 | return 0; |
e9ce1cd3 DM |
217 | } |
218 | EXPORT_SYMBOL(tcf_hash_check); | |
219 | ||
86062033 WC |
220 | void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est) |
221 | { | |
222 | struct tcf_common *pc = a->priv; | |
223 | if (est) | |
224 | gen_kill_estimator(&pc->tcfc_bstats, | |
225 | &pc->tcfc_rate_est); | |
226 | kfree_rcu(pc, tcfc_rcu); | |
227 | } | |
228 | EXPORT_SYMBOL(tcf_hash_cleanup); | |
229 | ||
230 | int tcf_hash_create(u32 index, struct nlattr *est, struct tc_action *a, | |
231 | int size, int bind) | |
e9ce1cd3 | 232 | { |
c779f7af | 233 | struct tcf_hashinfo *hinfo = a->ops->hinfo; |
e9ce1cd3 DM |
234 | struct tcf_common *p = kzalloc(size, GFP_KERNEL); |
235 | ||
236 | if (unlikely(!p)) | |
86062033 | 237 | return -ENOMEM; |
e9ce1cd3 DM |
238 | p->tcfc_refcnt = 1; |
239 | if (bind) | |
240 | p->tcfc_bindcnt = 1; | |
241 | ||
242 | spin_lock_init(&p->tcfc_lock); | |
89819dc0 | 243 | INIT_HLIST_NODE(&p->tcfc_head); |
ddafd34f | 244 | p->tcfc_index = index ? index : tcf_hash_new_index(hinfo); |
e9ce1cd3 DM |
245 | p->tcfc_tm.install = jiffies; |
246 | p->tcfc_tm.lastuse = jiffies; | |
0e991ec6 SH |
247 | if (est) { |
248 | int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est, | |
249 | &p->tcfc_lock, est); | |
250 | if (err) { | |
251 | kfree(p); | |
86062033 | 252 | return err; |
0e991ec6 SH |
253 | } |
254 | } | |
255 | ||
e9ce1cd3 | 256 | a->priv = (void *) p; |
86062033 | 257 | return 0; |
e9ce1cd3 DM |
258 | } |
259 | EXPORT_SYMBOL(tcf_hash_create); | |
260 | ||
86062033 | 261 | void tcf_hash_insert(struct tc_action *a) |
e9ce1cd3 | 262 | { |
86062033 WC |
263 | struct tcf_common *p = a->priv; |
264 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
e9ce1cd3 DM |
265 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); |
266 | ||
89819dc0 WC |
267 | spin_lock_bh(&hinfo->lock); |
268 | hlist_add_head(&p->tcfc_head, &hinfo->htab[h]); | |
269 | spin_unlock_bh(&hinfo->lock); | |
e9ce1cd3 DM |
270 | } |
271 | EXPORT_SYMBOL(tcf_hash_insert); | |
1da177e4 | 272 | |
1f747c26 | 273 | static LIST_HEAD(act_base); |
1da177e4 LT |
274 | static DEFINE_RWLOCK(act_mod_lock); |
275 | ||
276 | int tcf_register_action(struct tc_action_ops *act) | |
277 | { | |
1f747c26 | 278 | struct tc_action_ops *a; |
1da177e4 | 279 | |
76c82d7a JHS |
280 | /* Must supply act, dump, cleanup and init */ |
281 | if (!act->act || !act->dump || !act->cleanup || !act->init) | |
282 | return -EINVAL; | |
283 | ||
382ca8a1 | 284 | /* Supply defaults */ |
63ef6174 JHS |
285 | if (!act->lookup) |
286 | act->lookup = tcf_hash_search; | |
382ca8a1 JHS |
287 | if (!act->walk) |
288 | act->walk = tcf_generic_walker; | |
63ef6174 | 289 | |
1da177e4 | 290 | write_lock(&act_mod_lock); |
1f747c26 | 291 | list_for_each_entry(a, &act_base, head) { |
1da177e4 LT |
292 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { |
293 | write_unlock(&act_mod_lock); | |
294 | return -EEXIST; | |
295 | } | |
296 | } | |
1f747c26 | 297 | list_add_tail(&act->head, &act_base); |
1da177e4 LT |
298 | write_unlock(&act_mod_lock); |
299 | return 0; | |
300 | } | |
62e3ba1b | 301 | EXPORT_SYMBOL(tcf_register_action); |
1da177e4 LT |
302 | |
303 | int tcf_unregister_action(struct tc_action_ops *act) | |
304 | { | |
1f747c26 | 305 | struct tc_action_ops *a; |
1da177e4 LT |
306 | int err = -ENOENT; |
307 | ||
308 | write_lock(&act_mod_lock); | |
a792866a ED |
309 | list_for_each_entry(a, &act_base, head) { |
310 | if (a == act) { | |
311 | list_del(&act->head); | |
312 | err = 0; | |
1da177e4 | 313 | break; |
a792866a | 314 | } |
1da177e4 LT |
315 | } |
316 | write_unlock(&act_mod_lock); | |
317 | return err; | |
318 | } | |
62e3ba1b | 319 | EXPORT_SYMBOL(tcf_unregister_action); |
1da177e4 LT |
320 | |
321 | /* lookup by name */ | |
322 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
323 | { | |
a792866a | 324 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
325 | |
326 | if (kind) { | |
327 | read_lock(&act_mod_lock); | |
1f747c26 | 328 | list_for_each_entry(a, &act_base, head) { |
1da177e4 | 329 | if (strcmp(kind, a->kind) == 0) { |
a792866a ED |
330 | if (try_module_get(a->owner)) |
331 | res = a; | |
1da177e4 LT |
332 | break; |
333 | } | |
334 | } | |
335 | read_unlock(&act_mod_lock); | |
336 | } | |
a792866a | 337 | return res; |
1da177e4 LT |
338 | } |
339 | ||
7ba699c6 PM |
340 | /* lookup by nlattr */ |
341 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) | |
1da177e4 | 342 | { |
a792866a | 343 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
344 | |
345 | if (kind) { | |
346 | read_lock(&act_mod_lock); | |
1f747c26 | 347 | list_for_each_entry(a, &act_base, head) { |
7ba699c6 | 348 | if (nla_strcmp(kind, a->kind) == 0) { |
a792866a ED |
349 | if (try_module_get(a->owner)) |
350 | res = a; | |
1da177e4 LT |
351 | break; |
352 | } | |
353 | } | |
354 | read_unlock(&act_mod_lock); | |
355 | } | |
a792866a | 356 | return res; |
1da177e4 | 357 | } |
1da177e4 | 358 | |
33be6271 | 359 | int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions, |
10297b99 | 360 | struct tcf_result *res) |
1da177e4 | 361 | { |
dc7f9f6e | 362 | const struct tc_action *a; |
1da177e4 LT |
363 | int ret = -1; |
364 | ||
365 | if (skb->tc_verd & TC_NCLS) { | |
366 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
1da177e4 LT |
367 | ret = TC_ACT_OK; |
368 | goto exec_done; | |
369 | } | |
33be6271 | 370 | list_for_each_entry(a, actions, list) { |
1da177e4 | 371 | repeat: |
63acd680 JHS |
372 | ret = a->ops->act(skb, a, res); |
373 | if (TC_MUNGED & skb->tc_verd) { | |
374 | /* copied already, allow trampling */ | |
375 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); | |
376 | skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd); | |
1da177e4 | 377 | } |
63acd680 JHS |
378 | if (ret == TC_ACT_REPEAT) |
379 | goto repeat; /* we need a ttl - JHS */ | |
380 | if (ret != TC_ACT_PIPE) | |
381 | goto exec_done; | |
1da177e4 LT |
382 | } |
383 | exec_done: | |
1da177e4 LT |
384 | return ret; |
385 | } | |
62e3ba1b | 386 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 | 387 | |
33be6271 | 388 | void tcf_action_destroy(struct list_head *actions, int bind) |
1da177e4 | 389 | { |
33be6271 | 390 | struct tc_action *a, *tmp; |
1da177e4 | 391 | |
33be6271 | 392 | list_for_each_entry_safe(a, tmp, actions, list) { |
63acd680 JHS |
393 | if (a->ops->cleanup(a, bind) == ACT_P_DELETED) |
394 | module_put(a->ops->owner); | |
395 | list_del(&a->list); | |
396 | kfree(a); | |
1da177e4 LT |
397 | } |
398 | } | |
399 | ||
400 | int | |
401 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
402 | { | |
1da177e4 LT |
403 | return a->ops->dump(skb, a, bind, ref); |
404 | } | |
405 | ||
406 | int | |
407 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
408 | { | |
409 | int err = -EINVAL; | |
27a884dc | 410 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 411 | struct nlattr *nest; |
1da177e4 | 412 | |
1b34ec43 DM |
413 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) |
414 | goto nla_put_failure; | |
1da177e4 | 415 | if (tcf_action_copy_stats(skb, a, 0)) |
7ba699c6 | 416 | goto nla_put_failure; |
4b3550ef PM |
417 | nest = nla_nest_start(skb, TCA_OPTIONS); |
418 | if (nest == NULL) | |
419 | goto nla_put_failure; | |
cc7ec456 ED |
420 | err = tcf_action_dump_old(skb, a, bind, ref); |
421 | if (err > 0) { | |
4b3550ef | 422 | nla_nest_end(skb, nest); |
1da177e4 LT |
423 | return err; |
424 | } | |
425 | ||
7ba699c6 | 426 | nla_put_failure: |
dc5fc579 | 427 | nlmsg_trim(skb, b); |
1da177e4 LT |
428 | return -1; |
429 | } | |
62e3ba1b | 430 | EXPORT_SYMBOL(tcf_action_dump_1); |
1da177e4 LT |
431 | |
432 | int | |
33be6271 | 433 | tcf_action_dump(struct sk_buff *skb, struct list_head *actions, int bind, int ref) |
1da177e4 LT |
434 | { |
435 | struct tc_action *a; | |
436 | int err = -EINVAL; | |
4b3550ef | 437 | struct nlattr *nest; |
1da177e4 | 438 | |
33be6271 | 439 | list_for_each_entry(a, actions, list) { |
4b3550ef PM |
440 | nest = nla_nest_start(skb, a->order); |
441 | if (nest == NULL) | |
442 | goto nla_put_failure; | |
1da177e4 LT |
443 | err = tcf_action_dump_1(skb, a, bind, ref); |
444 | if (err < 0) | |
4fe683f5 | 445 | goto errout; |
4b3550ef | 446 | nla_nest_end(skb, nest); |
1da177e4 LT |
447 | } |
448 | ||
449 | return 0; | |
450 | ||
7ba699c6 | 451 | nla_put_failure: |
4fe683f5 TG |
452 | err = -EINVAL; |
453 | errout: | |
4b3550ef | 454 | nla_nest_cancel(skb, nest); |
4fe683f5 | 455 | return err; |
1da177e4 LT |
456 | } |
457 | ||
c1b52739 BL |
458 | struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla, |
459 | struct nlattr *est, char *name, int ovr, | |
460 | int bind) | |
1da177e4 LT |
461 | { |
462 | struct tc_action *a; | |
463 | struct tc_action_ops *a_o; | |
464 | char act_name[IFNAMSIZ]; | |
cc7ec456 | 465 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 466 | struct nlattr *kind; |
ab27cfb8 | 467 | int err; |
1da177e4 | 468 | |
1da177e4 | 469 | if (name == NULL) { |
cee63723 PM |
470 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
471 | if (err < 0) | |
1da177e4 | 472 | goto err_out; |
cee63723 | 473 | err = -EINVAL; |
7ba699c6 | 474 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
475 | if (kind == NULL) |
476 | goto err_out; | |
7ba699c6 | 477 | if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) |
1da177e4 LT |
478 | goto err_out; |
479 | } else { | |
cee63723 | 480 | err = -EINVAL; |
1da177e4 LT |
481 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) |
482 | goto err_out; | |
483 | } | |
484 | ||
485 | a_o = tc_lookup_action_n(act_name); | |
486 | if (a_o == NULL) { | |
95a5afca | 487 | #ifdef CONFIG_MODULES |
1da177e4 | 488 | rtnl_unlock(); |
4bba3925 | 489 | request_module("act_%s", act_name); |
1da177e4 LT |
490 | rtnl_lock(); |
491 | ||
492 | a_o = tc_lookup_action_n(act_name); | |
493 | ||
494 | /* We dropped the RTNL semaphore in order to | |
495 | * perform the module load. So, even if we | |
496 | * succeeded in loading the module we have to | |
497 | * tell the caller to replay the request. We | |
498 | * indicate this using -EAGAIN. | |
499 | */ | |
500 | if (a_o != NULL) { | |
ab27cfb8 | 501 | err = -EAGAIN; |
1da177e4 LT |
502 | goto err_mod; |
503 | } | |
504 | #endif | |
ab27cfb8 | 505 | err = -ENOENT; |
1da177e4 LT |
506 | goto err_out; |
507 | } | |
508 | ||
ab27cfb8 | 509 | err = -ENOMEM; |
0da974f4 | 510 | a = kzalloc(sizeof(*a), GFP_KERNEL); |
1da177e4 LT |
511 | if (a == NULL) |
512 | goto err_mod; | |
1da177e4 | 513 | |
c779f7af | 514 | a->ops = a_o; |
33be6271 | 515 | INIT_LIST_HEAD(&a->list); |
1da177e4 LT |
516 | /* backward compatibility for policer */ |
517 | if (name == NULL) | |
c1b52739 | 518 | err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, a, ovr, bind); |
1da177e4 | 519 | else |
c1b52739 | 520 | err = a_o->init(net, nla, est, a, ovr, bind); |
ab27cfb8 | 521 | if (err < 0) |
1da177e4 LT |
522 | goto err_free; |
523 | ||
524 | /* module count goes up only when brand new policy is created | |
cc7ec456 ED |
525 | * if it exists and is only bound to in a_o->init() then |
526 | * ACT_P_CREATED is not returned (a zero is). | |
527 | */ | |
ab27cfb8 | 528 | if (err != ACT_P_CREATED) |
1da177e4 | 529 | module_put(a_o->owner); |
1da177e4 | 530 | |
1da177e4 LT |
531 | return a; |
532 | ||
533 | err_free: | |
534 | kfree(a); | |
535 | err_mod: | |
536 | module_put(a_o->owner); | |
537 | err_out: | |
ab27cfb8 | 538 | return ERR_PTR(err); |
1da177e4 LT |
539 | } |
540 | ||
33be6271 | 541 | int tcf_action_init(struct net *net, struct nlattr *nla, |
c1b52739 | 542 | struct nlattr *est, char *name, int ovr, |
33be6271 | 543 | int bind, struct list_head *actions) |
1da177e4 | 544 | { |
cc7ec456 | 545 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 | 546 | struct tc_action *act; |
cee63723 | 547 | int err; |
1da177e4 LT |
548 | int i; |
549 | ||
cee63723 PM |
550 | err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
551 | if (err < 0) | |
33be6271 | 552 | return err; |
1da177e4 | 553 | |
7ba699c6 | 554 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
c1b52739 | 555 | act = tcf_action_init_1(net, tb[i], est, name, ovr, bind); |
33be6271 WC |
556 | if (IS_ERR(act)) { |
557 | err = PTR_ERR(act); | |
1da177e4 | 558 | goto err; |
33be6271 | 559 | } |
7ba699c6 | 560 | act->order = i; |
33be6271 | 561 | list_add_tail(&act->list, actions); |
1da177e4 | 562 | } |
33be6271 | 563 | return 0; |
1da177e4 LT |
564 | |
565 | err: | |
33be6271 WC |
566 | tcf_action_destroy(actions, bind); |
567 | return err; | |
1da177e4 LT |
568 | } |
569 | ||
570 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a, | |
571 | int compat_mode) | |
572 | { | |
573 | int err = 0; | |
574 | struct gnet_dump d; | |
7eb8896d | 575 | struct tcf_common *p = a->priv; |
10297b99 | 576 | |
7eb8896d | 577 | if (p == NULL) |
1da177e4 LT |
578 | goto errout; |
579 | ||
580 | /* compat_mode being true specifies a call that is supposed | |
06fe9fb4 | 581 | * to add additional backward compatibility statistic TLVs. |
1da177e4 LT |
582 | */ |
583 | if (compat_mode) { | |
584 | if (a->type == TCA_OLD_COMPAT) | |
585 | err = gnet_stats_start_copy_compat(skb, 0, | |
7eb8896d | 586 | TCA_STATS, TCA_XSTATS, &p->tcfc_lock, &d); |
1da177e4 LT |
587 | else |
588 | return 0; | |
589 | } else | |
590 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
7eb8896d | 591 | &p->tcfc_lock, &d); |
1da177e4 LT |
592 | |
593 | if (err < 0) | |
594 | goto errout; | |
595 | ||
7eb8896d WC |
596 | if (gnet_stats_copy_basic(&d, &p->tcfc_bstats) < 0 || |
597 | gnet_stats_copy_rate_est(&d, &p->tcfc_bstats, | |
598 | &p->tcfc_rate_est) < 0 || | |
599 | gnet_stats_copy_queue(&d, &p->tcfc_qstats) < 0) | |
1da177e4 LT |
600 | goto errout; |
601 | ||
602 | if (gnet_stats_finish_copy(&d) < 0) | |
603 | goto errout; | |
604 | ||
605 | return 0; | |
606 | ||
607 | errout: | |
608 | return -1; | |
609 | } | |
610 | ||
611 | static int | |
33be6271 | 612 | tca_get_fill(struct sk_buff *skb, struct list_head *actions, u32 portid, u32 seq, |
10297b99 | 613 | u16 flags, int event, int bind, int ref) |
1da177e4 LT |
614 | { |
615 | struct tcamsg *t; | |
616 | struct nlmsghdr *nlh; | |
27a884dc | 617 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 618 | struct nlattr *nest; |
1da177e4 | 619 | |
15e47304 | 620 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags); |
8b00a53c DM |
621 | if (!nlh) |
622 | goto out_nlmsg_trim; | |
623 | t = nlmsg_data(nlh); | |
1da177e4 | 624 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
625 | t->tca__pad1 = 0; |
626 | t->tca__pad2 = 0; | |
10297b99 | 627 | |
4b3550ef PM |
628 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
629 | if (nest == NULL) | |
8b00a53c | 630 | goto out_nlmsg_trim; |
1da177e4 | 631 | |
33be6271 | 632 | if (tcf_action_dump(skb, actions, bind, ref) < 0) |
8b00a53c | 633 | goto out_nlmsg_trim; |
1da177e4 | 634 | |
4b3550ef | 635 | nla_nest_end(skb, nest); |
10297b99 | 636 | |
27a884dc | 637 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
638 | return skb->len; |
639 | ||
8b00a53c | 640 | out_nlmsg_trim: |
dc5fc579 | 641 | nlmsg_trim(skb, b); |
1da177e4 LT |
642 | return -1; |
643 | } | |
644 | ||
645 | static int | |
15e47304 | 646 | act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n, |
33be6271 | 647 | struct list_head *actions, int event) |
1da177e4 LT |
648 | { |
649 | struct sk_buff *skb; | |
1da177e4 LT |
650 | |
651 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
652 | if (!skb) | |
653 | return -ENOBUFS; | |
33be6271 | 654 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { |
1da177e4 LT |
655 | kfree_skb(skb); |
656 | return -EINVAL; | |
657 | } | |
2942e900 | 658 | |
15e47304 | 659 | return rtnl_unicast(skb, net, portid); |
1da177e4 LT |
660 | } |
661 | ||
662 | static struct tc_action * | |
15e47304 | 663 | tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 portid) |
1da177e4 | 664 | { |
cc7ec456 | 665 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
1da177e4 LT |
666 | struct tc_action *a; |
667 | int index; | |
ab27cfb8 | 668 | int err; |
1da177e4 | 669 | |
cee63723 PM |
670 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
671 | if (err < 0) | |
ab27cfb8 | 672 | goto err_out; |
1da177e4 | 673 | |
cee63723 | 674 | err = -EINVAL; |
7ba699c6 PM |
675 | if (tb[TCA_ACT_INDEX] == NULL || |
676 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) | |
ab27cfb8 | 677 | goto err_out; |
1587bac4 | 678 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 679 | |
ab27cfb8 | 680 | err = -ENOMEM; |
0da974f4 | 681 | a = kzalloc(sizeof(struct tc_action), GFP_KERNEL); |
1da177e4 | 682 | if (a == NULL) |
ab27cfb8 | 683 | goto err_out; |
1da177e4 | 684 | |
33be6271 | 685 | INIT_LIST_HEAD(&a->list); |
ab27cfb8 | 686 | err = -EINVAL; |
7ba699c6 | 687 | a->ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
63acd680 | 688 | if (a->ops == NULL) /* could happen in batch of actions */ |
1da177e4 | 689 | goto err_free; |
ab27cfb8 | 690 | err = -ENOENT; |
1da177e4 LT |
691 | if (a->ops->lookup(a, index) == 0) |
692 | goto err_mod; | |
693 | ||
694 | module_put(a->ops->owner); | |
1da177e4 | 695 | return a; |
ab27cfb8 | 696 | |
1da177e4 LT |
697 | err_mod: |
698 | module_put(a->ops->owner); | |
699 | err_free: | |
700 | kfree(a); | |
ab27cfb8 PM |
701 | err_out: |
702 | return ERR_PTR(err); | |
1da177e4 LT |
703 | } |
704 | ||
33be6271 | 705 | static void cleanup_a(struct list_head *actions) |
1da177e4 | 706 | { |
33be6271 | 707 | struct tc_action *a, *tmp; |
1da177e4 | 708 | |
33be6271 WC |
709 | list_for_each_entry_safe(a, tmp, actions, list) { |
710 | list_del(&a->list); | |
1da177e4 LT |
711 | kfree(a); |
712 | } | |
713 | } | |
714 | ||
715 | static struct tc_action *create_a(int i) | |
716 | { | |
717 | struct tc_action *act; | |
718 | ||
0da974f4 | 719 | act = kzalloc(sizeof(*act), GFP_KERNEL); |
1da177e4 | 720 | if (act == NULL) { |
6ff9c364 | 721 | pr_debug("create_a: failed to alloc!\n"); |
1da177e4 LT |
722 | return NULL; |
723 | } | |
1da177e4 | 724 | act->order = i; |
33be6271 | 725 | INIT_LIST_HEAD(&act->list); |
1da177e4 LT |
726 | return act; |
727 | } | |
728 | ||
7316ae88 | 729 | static int tca_action_flush(struct net *net, struct nlattr *nla, |
15e47304 | 730 | struct nlmsghdr *n, u32 portid) |
1da177e4 LT |
731 | { |
732 | struct sk_buff *skb; | |
733 | unsigned char *b; | |
734 | struct nlmsghdr *nlh; | |
735 | struct tcamsg *t; | |
736 | struct netlink_callback dcb; | |
4b3550ef | 737 | struct nlattr *nest; |
cc7ec456 | 738 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 739 | struct nlattr *kind; |
1da177e4 | 740 | struct tc_action *a = create_a(0); |
36723873 | 741 | int err = -ENOMEM; |
1da177e4 LT |
742 | |
743 | if (a == NULL) { | |
6ff9c364 | 744 | pr_debug("tca_action_flush: couldnt create tc_action\n"); |
1da177e4 LT |
745 | return err; |
746 | } | |
747 | ||
748 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
749 | if (!skb) { | |
6ff9c364 | 750 | pr_debug("tca_action_flush: failed skb alloc\n"); |
1da177e4 | 751 | kfree(a); |
36723873 | 752 | return err; |
1da177e4 LT |
753 | } |
754 | ||
27a884dc | 755 | b = skb_tail_pointer(skb); |
1da177e4 | 756 | |
cee63723 PM |
757 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
758 | if (err < 0) | |
1da177e4 LT |
759 | goto err_out; |
760 | ||
cee63723 | 761 | err = -EINVAL; |
7ba699c6 | 762 | kind = tb[TCA_ACT_KIND]; |
1da177e4 | 763 | a->ops = tc_lookup_action(kind); |
63acd680 | 764 | if (a->ops == NULL) /*some idjot trying to flush unknown action */ |
1da177e4 LT |
765 | goto err_out; |
766 | ||
15e47304 | 767 | nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t), 0); |
8b00a53c DM |
768 | if (!nlh) |
769 | goto out_module_put; | |
770 | t = nlmsg_data(nlh); | |
1da177e4 | 771 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
772 | t->tca__pad1 = 0; |
773 | t->tca__pad2 = 0; | |
1da177e4 | 774 | |
4b3550ef PM |
775 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
776 | if (nest == NULL) | |
8b00a53c | 777 | goto out_module_put; |
1da177e4 LT |
778 | |
779 | err = a->ops->walk(skb, &dcb, RTM_DELACTION, a); | |
780 | if (err < 0) | |
8b00a53c | 781 | goto out_module_put; |
f97017cd JHS |
782 | if (err == 0) |
783 | goto noflush_out; | |
1da177e4 | 784 | |
4b3550ef | 785 | nla_nest_end(skb, nest); |
1da177e4 | 786 | |
27a884dc | 787 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
788 | nlh->nlmsg_flags |= NLM_F_ROOT; |
789 | module_put(a->ops->owner); | |
790 | kfree(a); | |
15e47304 | 791 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 792 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
793 | if (err > 0) |
794 | return 0; | |
795 | ||
796 | return err; | |
797 | ||
8b00a53c | 798 | out_module_put: |
ebbaeab1 | 799 | module_put(a->ops->owner); |
1da177e4 | 800 | err_out: |
f97017cd | 801 | noflush_out: |
1da177e4 LT |
802 | kfree_skb(skb); |
803 | kfree(a); | |
804 | return err; | |
805 | } | |
806 | ||
a56e1953 WC |
807 | static int |
808 | tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions, | |
809 | u32 portid) | |
810 | { | |
811 | int ret; | |
812 | struct sk_buff *skb; | |
813 | ||
814 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
815 | if (!skb) | |
816 | return -ENOBUFS; | |
817 | ||
818 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION, | |
819 | 0, 1) <= 0) { | |
820 | kfree_skb(skb); | |
821 | return -EINVAL; | |
822 | } | |
823 | ||
824 | /* now do the delete */ | |
825 | tcf_action_destroy(actions, 0); | |
826 | ||
827 | ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
828 | n->nlmsg_flags & NLM_F_ECHO); | |
829 | if (ret > 0) | |
830 | return 0; | |
831 | return ret; | |
832 | } | |
833 | ||
1da177e4 | 834 | static int |
7316ae88 | 835 | tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
15e47304 | 836 | u32 portid, int event) |
1da177e4 | 837 | { |
cee63723 | 838 | int i, ret; |
cc7ec456 | 839 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 WC |
840 | struct tc_action *act; |
841 | LIST_HEAD(actions); | |
1da177e4 | 842 | |
cee63723 PM |
843 | ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
844 | if (ret < 0) | |
845 | return ret; | |
1da177e4 | 846 | |
cc7ec456 | 847 | if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) { |
f97017cd | 848 | if (tb[1] != NULL) |
15e47304 | 849 | return tca_action_flush(net, tb[1], n, portid); |
f97017cd JHS |
850 | else |
851 | return -EINVAL; | |
1da177e4 LT |
852 | } |
853 | ||
7ba699c6 | 854 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
15e47304 | 855 | act = tcf_action_get_1(tb[i], n, portid); |
ab27cfb8 PM |
856 | if (IS_ERR(act)) { |
857 | ret = PTR_ERR(act); | |
1da177e4 | 858 | goto err; |
ab27cfb8 | 859 | } |
7ba699c6 | 860 | act->order = i; |
33be6271 | 861 | list_add_tail(&act->list, &actions); |
1da177e4 LT |
862 | } |
863 | ||
864 | if (event == RTM_GETACTION) | |
33be6271 | 865 | ret = act_get_notify(net, portid, n, &actions, event); |
1da177e4 | 866 | else { /* delete */ |
a56e1953 WC |
867 | ret = tcf_del_notify(net, n, &actions, portid); |
868 | if (ret) | |
1da177e4 | 869 | goto err; |
1da177e4 LT |
870 | return ret; |
871 | } | |
872 | err: | |
33be6271 | 873 | cleanup_a(&actions); |
1da177e4 LT |
874 | return ret; |
875 | } | |
876 | ||
a56e1953 WC |
877 | static int |
878 | tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions, | |
879 | u32 portid) | |
1da177e4 | 880 | { |
1da177e4 | 881 | struct sk_buff *skb; |
1da177e4 LT |
882 | int err = 0; |
883 | ||
884 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
885 | if (!skb) | |
886 | return -ENOBUFS; | |
887 | ||
a56e1953 WC |
888 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags, |
889 | RTM_NEWACTION, 0, 0) <= 0) { | |
890 | kfree_skb(skb); | |
891 | return -EINVAL; | |
892 | } | |
10297b99 | 893 | |
a56e1953 WC |
894 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
895 | n->nlmsg_flags & NLM_F_ECHO); | |
1da177e4 LT |
896 | if (err > 0) |
897 | err = 0; | |
898 | return err; | |
1da177e4 LT |
899 | } |
900 | ||
1da177e4 | 901 | static int |
7316ae88 | 902 | tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
15e47304 | 903 | u32 portid, int ovr) |
1da177e4 LT |
904 | { |
905 | int ret = 0; | |
33be6271 | 906 | LIST_HEAD(actions); |
1da177e4 | 907 | |
33be6271 WC |
908 | ret = tcf_action_init(net, nla, NULL, NULL, ovr, 0, &actions); |
909 | if (ret) | |
ab27cfb8 | 910 | goto done; |
1da177e4 LT |
911 | |
912 | /* dump then free all the actions after update; inserted policy | |
913 | * stays intact | |
cc7ec456 | 914 | */ |
a56e1953 | 915 | ret = tcf_add_notify(net, n, &actions, portid); |
33be6271 | 916 | cleanup_a(&actions); |
1da177e4 LT |
917 | done: |
918 | return ret; | |
919 | } | |
920 | ||
661d2967 | 921 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 922 | { |
3b1e0a65 | 923 | struct net *net = sock_net(skb->sk); |
7ba699c6 | 924 | struct nlattr *tca[TCA_ACT_MAX + 1]; |
15e47304 | 925 | u32 portid = skb ? NETLINK_CB(skb).portid : 0; |
1da177e4 LT |
926 | int ret = 0, ovr = 0; |
927 | ||
dfc47ef8 EB |
928 | if ((n->nlmsg_type != RTM_GETACTION) && !capable(CAP_NET_ADMIN)) |
929 | return -EPERM; | |
930 | ||
7ba699c6 PM |
931 | ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL); |
932 | if (ret < 0) | |
933 | return ret; | |
934 | ||
935 | if (tca[TCA_ACT_TAB] == NULL) { | |
6ff9c364 | 936 | pr_notice("tc_ctl_action: received NO action attribs\n"); |
1da177e4 LT |
937 | return -EINVAL; |
938 | } | |
939 | ||
cc7ec456 | 940 | /* n->nlmsg_flags & NLM_F_CREATE */ |
1da177e4 LT |
941 | switch (n->nlmsg_type) { |
942 | case RTM_NEWACTION: | |
943 | /* we are going to assume all other flags | |
25985edc | 944 | * imply create only if it doesn't exist |
1da177e4 LT |
945 | * Note that CREATE | EXCL implies that |
946 | * but since we want avoid ambiguity (eg when flags | |
947 | * is zero) then just set this | |
948 | */ | |
cc7ec456 | 949 | if (n->nlmsg_flags & NLM_F_REPLACE) |
1da177e4 LT |
950 | ovr = 1; |
951 | replay: | |
15e47304 | 952 | ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr); |
1da177e4 LT |
953 | if (ret == -EAGAIN) |
954 | goto replay; | |
955 | break; | |
956 | case RTM_DELACTION: | |
7316ae88 | 957 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
15e47304 | 958 | portid, RTM_DELACTION); |
1da177e4 LT |
959 | break; |
960 | case RTM_GETACTION: | |
7316ae88 | 961 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
15e47304 | 962 | portid, RTM_GETACTION); |
1da177e4 LT |
963 | break; |
964 | default: | |
965 | BUG(); | |
966 | } | |
967 | ||
968 | return ret; | |
969 | } | |
970 | ||
7ba699c6 | 971 | static struct nlattr * |
3a6c2b41 | 972 | find_dump_kind(const struct nlmsghdr *n) |
1da177e4 | 973 | { |
cc7ec456 | 974 | struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1]; |
7ba699c6 PM |
975 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
976 | struct nlattr *nla[TCAA_MAX + 1]; | |
977 | struct nlattr *kind; | |
1da177e4 | 978 | |
c96c9471 | 979 | if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0) |
1da177e4 | 980 | return NULL; |
7ba699c6 | 981 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
982 | if (tb1 == NULL) |
983 | return NULL; | |
984 | ||
7ba699c6 PM |
985 | if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), |
986 | NLMSG_ALIGN(nla_len(tb1)), NULL) < 0) | |
1da177e4 | 987 | return NULL; |
1da177e4 | 988 | |
6d834e04 PM |
989 | if (tb[1] == NULL) |
990 | return NULL; | |
991 | if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]), | |
992 | nla_len(tb[1]), NULL) < 0) | |
1da177e4 | 993 | return NULL; |
7ba699c6 | 994 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 995 | |
26dab893 | 996 | return kind; |
1da177e4 LT |
997 | } |
998 | ||
999 | static int | |
1000 | tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) | |
1001 | { | |
1002 | struct nlmsghdr *nlh; | |
27a884dc | 1003 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1004 | struct nlattr *nest; |
1da177e4 LT |
1005 | struct tc_action_ops *a_o; |
1006 | struct tc_action a; | |
1007 | int ret = 0; | |
8b00a53c | 1008 | struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh); |
7ba699c6 | 1009 | struct nlattr *kind = find_dump_kind(cb->nlh); |
1da177e4 LT |
1010 | |
1011 | if (kind == NULL) { | |
6ff9c364 | 1012 | pr_info("tc_dump_action: action bad kind\n"); |
1da177e4 LT |
1013 | return 0; |
1014 | } | |
1015 | ||
26dab893 | 1016 | a_o = tc_lookup_action(kind); |
cc7ec456 | 1017 | if (a_o == NULL) |
1da177e4 | 1018 | return 0; |
1da177e4 LT |
1019 | |
1020 | memset(&a, 0, sizeof(struct tc_action)); | |
1021 | a.ops = a_o; | |
1022 | ||
15e47304 | 1023 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
8b00a53c DM |
1024 | cb->nlh->nlmsg_type, sizeof(*t), 0); |
1025 | if (!nlh) | |
1026 | goto out_module_put; | |
1027 | t = nlmsg_data(nlh); | |
1da177e4 | 1028 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1029 | t->tca__pad1 = 0; |
1030 | t->tca__pad2 = 0; | |
1da177e4 | 1031 | |
4b3550ef PM |
1032 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
1033 | if (nest == NULL) | |
8b00a53c | 1034 | goto out_module_put; |
1da177e4 LT |
1035 | |
1036 | ret = a_o->walk(skb, cb, RTM_GETACTION, &a); | |
1037 | if (ret < 0) | |
8b00a53c | 1038 | goto out_module_put; |
1da177e4 LT |
1039 | |
1040 | if (ret > 0) { | |
4b3550ef | 1041 | nla_nest_end(skb, nest); |
1da177e4 LT |
1042 | ret = skb->len; |
1043 | } else | |
4b3550ef | 1044 | nla_nest_cancel(skb, nest); |
1da177e4 | 1045 | |
27a884dc | 1046 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
15e47304 | 1047 | if (NETLINK_CB(cb->skb).portid && ret) |
1da177e4 LT |
1048 | nlh->nlmsg_flags |= NLM_F_MULTI; |
1049 | module_put(a_o->owner); | |
1050 | return skb->len; | |
1051 | ||
8b00a53c | 1052 | out_module_put: |
1da177e4 | 1053 | module_put(a_o->owner); |
dc5fc579 | 1054 | nlmsg_trim(skb, b); |
1da177e4 LT |
1055 | return skb->len; |
1056 | } | |
1057 | ||
1058 | static int __init tc_action_init(void) | |
1059 | { | |
c7ac8679 GR |
1060 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL); |
1061 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL); | |
1062 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, | |
1063 | NULL); | |
1da177e4 | 1064 | |
1da177e4 LT |
1065 | return 0; |
1066 | } | |
1067 | ||
1068 | subsys_initcall(tc_action_init); |