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--; | |
55334a5d WC |
56 | else if (p->tcfc_bindcnt > 0) |
57 | return -EPERM; | |
e9ce1cd3 DM |
58 | |
59 | p->tcfc_refcnt--; | |
10297b99 | 60 | if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) { |
a5b5c958 WC |
61 | if (a->ops->cleanup) |
62 | a->ops->cleanup(a, bind); | |
86062033 | 63 | tcf_hash_destroy(a); |
e9ce1cd3 DM |
64 | ret = 1; |
65 | } | |
66 | } | |
67 | return ret; | |
68 | } | |
69 | EXPORT_SYMBOL(tcf_hash_release); | |
70 | ||
71 | static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
c779f7af | 72 | struct tc_action *a) |
e9ce1cd3 | 73 | { |
c779f7af | 74 | struct tcf_hashinfo *hinfo = a->ops->hinfo; |
89819dc0 | 75 | struct hlist_head *head; |
e9ce1cd3 | 76 | struct tcf_common *p; |
cc7ec456 | 77 | int err = 0, index = -1, i = 0, s_i = 0, n_i = 0; |
4b3550ef | 78 | struct nlattr *nest; |
e9ce1cd3 | 79 | |
89819dc0 | 80 | spin_lock_bh(&hinfo->lock); |
e9ce1cd3 DM |
81 | |
82 | s_i = cb->args[0]; | |
83 | ||
84 | for (i = 0; i < (hinfo->hmask + 1); i++) { | |
89819dc0 | 85 | head = &hinfo->htab[tcf_hash(i, hinfo->hmask)]; |
e9ce1cd3 | 86 | |
89819dc0 | 87 | hlist_for_each_entry_rcu(p, head, tcfc_head) { |
e9ce1cd3 DM |
88 | index++; |
89 | if (index < s_i) | |
90 | continue; | |
91 | a->priv = p; | |
92 | a->order = n_i; | |
4b3550ef PM |
93 | |
94 | nest = nla_nest_start(skb, a->order); | |
95 | if (nest == NULL) | |
96 | goto nla_put_failure; | |
e9ce1cd3 DM |
97 | err = tcf_action_dump_1(skb, a, 0, 0); |
98 | if (err < 0) { | |
99 | index--; | |
4b3550ef | 100 | nlmsg_trim(skb, nest); |
e9ce1cd3 DM |
101 | goto done; |
102 | } | |
4b3550ef | 103 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
104 | n_i++; |
105 | if (n_i >= TCA_ACT_MAX_PRIO) | |
106 | goto done; | |
107 | } | |
108 | } | |
109 | done: | |
89819dc0 | 110 | spin_unlock_bh(&hinfo->lock); |
e9ce1cd3 DM |
111 | if (n_i) |
112 | cb->args[0] += n_i; | |
113 | return n_i; | |
114 | ||
7ba699c6 | 115 | nla_put_failure: |
4b3550ef | 116 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
117 | goto done; |
118 | } | |
119 | ||
c779f7af | 120 | static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a) |
e9ce1cd3 | 121 | { |
c779f7af | 122 | struct tcf_hashinfo *hinfo = a->ops->hinfo; |
89819dc0 WC |
123 | struct hlist_head *head; |
124 | struct hlist_node *n; | |
125 | struct tcf_common *p; | |
4b3550ef | 126 | struct nlattr *nest; |
cc7ec456 | 127 | int i = 0, n_i = 0; |
55334a5d | 128 | int ret = -EINVAL; |
e9ce1cd3 | 129 | |
4b3550ef PM |
130 | nest = nla_nest_start(skb, a->order); |
131 | if (nest == NULL) | |
132 | goto nla_put_failure; | |
1b34ec43 DM |
133 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) |
134 | goto nla_put_failure; | |
e9ce1cd3 | 135 | for (i = 0; i < (hinfo->hmask + 1); i++) { |
89819dc0 WC |
136 | head = &hinfo->htab[tcf_hash(i, hinfo->hmask)]; |
137 | hlist_for_each_entry_safe(p, n, head, tcfc_head) { | |
86062033 | 138 | a->priv = p; |
55334a5d WC |
139 | ret = tcf_hash_release(a, 0); |
140 | if (ret == ACT_P_DELETED) { | |
cc7ec456 | 141 | module_put(a->ops->owner); |
805c1f4a | 142 | n_i++; |
55334a5d WC |
143 | } else if (ret < 0) |
144 | goto nla_put_failure; | |
e9ce1cd3 DM |
145 | } |
146 | } | |
1b34ec43 DM |
147 | if (nla_put_u32(skb, TCA_FCNT, n_i)) |
148 | goto nla_put_failure; | |
4b3550ef | 149 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
150 | |
151 | return n_i; | |
7ba699c6 | 152 | nla_put_failure: |
4b3550ef | 153 | nla_nest_cancel(skb, nest); |
55334a5d | 154 | return ret; |
e9ce1cd3 DM |
155 | } |
156 | ||
9c75f402 | 157 | static int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb, |
158 | int type, struct tc_action *a) | |
e9ce1cd3 | 159 | { |
e9ce1cd3 | 160 | if (type == RTM_DELACTION) { |
c779f7af | 161 | return tcf_del_walker(skb, a); |
e9ce1cd3 | 162 | } else if (type == RTM_GETACTION) { |
c779f7af | 163 | return tcf_dump_walker(skb, cb, a); |
e9ce1cd3 | 164 | } else { |
6ff9c364 | 165 | WARN(1, "tcf_generic_walker: unknown action %d\n", type); |
e9ce1cd3 DM |
166 | return -EINVAL; |
167 | } | |
168 | } | |
e9ce1cd3 | 169 | |
6e6a50c2 | 170 | static struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo) |
e9ce1cd3 | 171 | { |
89819dc0 WC |
172 | struct tcf_common *p = NULL; |
173 | struct hlist_head *head; | |
e9ce1cd3 | 174 | |
89819dc0 WC |
175 | spin_lock_bh(&hinfo->lock); |
176 | head = &hinfo->htab[tcf_hash(index, hinfo->hmask)]; | |
177 | hlist_for_each_entry_rcu(p, head, tcfc_head) | |
e9ce1cd3 DM |
178 | if (p->tcfc_index == index) |
179 | break; | |
89819dc0 | 180 | spin_unlock_bh(&hinfo->lock); |
e9ce1cd3 DM |
181 | |
182 | return p; | |
183 | } | |
e9ce1cd3 | 184 | |
ddafd34f | 185 | u32 tcf_hash_new_index(struct tcf_hashinfo *hinfo) |
e9ce1cd3 | 186 | { |
ddafd34f | 187 | u32 val = hinfo->index; |
e9ce1cd3 DM |
188 | |
189 | do { | |
190 | if (++val == 0) | |
191 | val = 1; | |
192 | } while (tcf_hash_lookup(val, hinfo)); | |
193 | ||
ddafd34f | 194 | hinfo->index = val; |
17569fae | 195 | return val; |
e9ce1cd3 DM |
196 | } |
197 | EXPORT_SYMBOL(tcf_hash_new_index); | |
198 | ||
6e6a50c2 | 199 | int tcf_hash_search(struct tc_action *a, u32 index) |
e9ce1cd3 DM |
200 | { |
201 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
202 | struct tcf_common *p = tcf_hash_lookup(index, hinfo); | |
203 | ||
204 | if (p) { | |
205 | a->priv = p; | |
206 | return 1; | |
207 | } | |
208 | return 0; | |
209 | } | |
6e6a50c2 | 210 | EXPORT_SYMBOL(tcf_hash_search); |
e9ce1cd3 | 211 | |
86062033 | 212 | int tcf_hash_check(u32 index, struct tc_action *a, int bind) |
e9ce1cd3 | 213 | { |
c779f7af | 214 | struct tcf_hashinfo *hinfo = a->ops->hinfo; |
e9ce1cd3 DM |
215 | struct tcf_common *p = NULL; |
216 | if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) { | |
76aab2c1 | 217 | if (bind) |
e9ce1cd3 | 218 | p->tcfc_bindcnt++; |
76aab2c1 | 219 | p->tcfc_refcnt++; |
e9ce1cd3 | 220 | a->priv = p; |
86062033 | 221 | return 1; |
e9ce1cd3 | 222 | } |
86062033 | 223 | return 0; |
e9ce1cd3 DM |
224 | } |
225 | EXPORT_SYMBOL(tcf_hash_check); | |
226 | ||
86062033 WC |
227 | void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est) |
228 | { | |
229 | struct tcf_common *pc = a->priv; | |
230 | if (est) | |
231 | gen_kill_estimator(&pc->tcfc_bstats, | |
232 | &pc->tcfc_rate_est); | |
233 | kfree_rcu(pc, tcfc_rcu); | |
234 | } | |
235 | EXPORT_SYMBOL(tcf_hash_cleanup); | |
236 | ||
237 | int tcf_hash_create(u32 index, struct nlattr *est, struct tc_action *a, | |
238 | int size, int bind) | |
e9ce1cd3 | 239 | { |
c779f7af | 240 | struct tcf_hashinfo *hinfo = a->ops->hinfo; |
e9ce1cd3 DM |
241 | struct tcf_common *p = kzalloc(size, GFP_KERNEL); |
242 | ||
243 | if (unlikely(!p)) | |
86062033 | 244 | return -ENOMEM; |
e9ce1cd3 DM |
245 | p->tcfc_refcnt = 1; |
246 | if (bind) | |
247 | p->tcfc_bindcnt = 1; | |
248 | ||
249 | spin_lock_init(&p->tcfc_lock); | |
89819dc0 | 250 | INIT_HLIST_NODE(&p->tcfc_head); |
ddafd34f | 251 | p->tcfc_index = index ? index : tcf_hash_new_index(hinfo); |
e9ce1cd3 DM |
252 | p->tcfc_tm.install = jiffies; |
253 | p->tcfc_tm.lastuse = jiffies; | |
0e991ec6 SH |
254 | if (est) { |
255 | int err = gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est, | |
256 | &p->tcfc_lock, est); | |
257 | if (err) { | |
258 | kfree(p); | |
86062033 | 259 | return err; |
0e991ec6 SH |
260 | } |
261 | } | |
262 | ||
e9ce1cd3 | 263 | a->priv = (void *) p; |
86062033 | 264 | return 0; |
e9ce1cd3 DM |
265 | } |
266 | EXPORT_SYMBOL(tcf_hash_create); | |
267 | ||
86062033 | 268 | void tcf_hash_insert(struct tc_action *a) |
e9ce1cd3 | 269 | { |
86062033 WC |
270 | struct tcf_common *p = a->priv; |
271 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
e9ce1cd3 DM |
272 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); |
273 | ||
89819dc0 WC |
274 | spin_lock_bh(&hinfo->lock); |
275 | hlist_add_head(&p->tcfc_head, &hinfo->htab[h]); | |
276 | spin_unlock_bh(&hinfo->lock); | |
e9ce1cd3 DM |
277 | } |
278 | EXPORT_SYMBOL(tcf_hash_insert); | |
1da177e4 | 279 | |
1f747c26 | 280 | static LIST_HEAD(act_base); |
1da177e4 LT |
281 | static DEFINE_RWLOCK(act_mod_lock); |
282 | ||
4f1e9d89 | 283 | int tcf_register_action(struct tc_action_ops *act, unsigned int mask) |
1da177e4 | 284 | { |
1f747c26 | 285 | struct tc_action_ops *a; |
4f1e9d89 | 286 | int err; |
1da177e4 | 287 | |
a5b5c958 WC |
288 | /* Must supply act, dump and init */ |
289 | if (!act->act || !act->dump || !act->init) | |
76c82d7a JHS |
290 | return -EINVAL; |
291 | ||
382ca8a1 | 292 | /* Supply defaults */ |
63ef6174 JHS |
293 | if (!act->lookup) |
294 | act->lookup = tcf_hash_search; | |
382ca8a1 JHS |
295 | if (!act->walk) |
296 | act->walk = tcf_generic_walker; | |
63ef6174 | 297 | |
4f1e9d89 WC |
298 | act->hinfo = kmalloc(sizeof(struct tcf_hashinfo), GFP_KERNEL); |
299 | if (!act->hinfo) | |
300 | return -ENOMEM; | |
301 | err = tcf_hashinfo_init(act->hinfo, mask); | |
302 | if (err) { | |
303 | kfree(act->hinfo); | |
304 | return err; | |
305 | } | |
306 | ||
1da177e4 | 307 | write_lock(&act_mod_lock); |
1f747c26 | 308 | list_for_each_entry(a, &act_base, head) { |
1da177e4 LT |
309 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { |
310 | write_unlock(&act_mod_lock); | |
4f1e9d89 WC |
311 | tcf_hashinfo_destroy(act->hinfo); |
312 | kfree(act->hinfo); | |
1da177e4 LT |
313 | return -EEXIST; |
314 | } | |
315 | } | |
1f747c26 | 316 | list_add_tail(&act->head, &act_base); |
1da177e4 LT |
317 | write_unlock(&act_mod_lock); |
318 | return 0; | |
319 | } | |
62e3ba1b | 320 | EXPORT_SYMBOL(tcf_register_action); |
1da177e4 LT |
321 | |
322 | int tcf_unregister_action(struct tc_action_ops *act) | |
323 | { | |
1f747c26 | 324 | struct tc_action_ops *a; |
1da177e4 LT |
325 | int err = -ENOENT; |
326 | ||
327 | write_lock(&act_mod_lock); | |
a792866a ED |
328 | list_for_each_entry(a, &act_base, head) { |
329 | if (a == act) { | |
330 | list_del(&act->head); | |
4f1e9d89 WC |
331 | tcf_hashinfo_destroy(act->hinfo); |
332 | kfree(act->hinfo); | |
a792866a | 333 | err = 0; |
1da177e4 | 334 | break; |
a792866a | 335 | } |
1da177e4 LT |
336 | } |
337 | write_unlock(&act_mod_lock); | |
338 | return err; | |
339 | } | |
62e3ba1b | 340 | EXPORT_SYMBOL(tcf_unregister_action); |
1da177e4 LT |
341 | |
342 | /* lookup by name */ | |
343 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
344 | { | |
a792866a | 345 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
346 | |
347 | if (kind) { | |
348 | read_lock(&act_mod_lock); | |
1f747c26 | 349 | list_for_each_entry(a, &act_base, head) { |
1da177e4 | 350 | if (strcmp(kind, a->kind) == 0) { |
a792866a ED |
351 | if (try_module_get(a->owner)) |
352 | res = a; | |
1da177e4 LT |
353 | break; |
354 | } | |
355 | } | |
356 | read_unlock(&act_mod_lock); | |
357 | } | |
a792866a | 358 | return res; |
1da177e4 LT |
359 | } |
360 | ||
7ba699c6 PM |
361 | /* lookup by nlattr */ |
362 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) | |
1da177e4 | 363 | { |
a792866a | 364 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
365 | |
366 | if (kind) { | |
367 | read_lock(&act_mod_lock); | |
1f747c26 | 368 | list_for_each_entry(a, &act_base, head) { |
7ba699c6 | 369 | if (nla_strcmp(kind, a->kind) == 0) { |
a792866a ED |
370 | if (try_module_get(a->owner)) |
371 | res = a; | |
1da177e4 LT |
372 | break; |
373 | } | |
374 | } | |
375 | read_unlock(&act_mod_lock); | |
376 | } | |
a792866a | 377 | return res; |
1da177e4 | 378 | } |
1da177e4 | 379 | |
33be6271 | 380 | int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions, |
10297b99 | 381 | struct tcf_result *res) |
1da177e4 | 382 | { |
dc7f9f6e | 383 | const struct tc_action *a; |
1da177e4 LT |
384 | int ret = -1; |
385 | ||
386 | if (skb->tc_verd & TC_NCLS) { | |
387 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
1da177e4 LT |
388 | ret = TC_ACT_OK; |
389 | goto exec_done; | |
390 | } | |
33be6271 | 391 | list_for_each_entry(a, actions, list) { |
1da177e4 | 392 | repeat: |
63acd680 JHS |
393 | ret = a->ops->act(skb, a, res); |
394 | if (TC_MUNGED & skb->tc_verd) { | |
395 | /* copied already, allow trampling */ | |
396 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); | |
397 | skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd); | |
1da177e4 | 398 | } |
63acd680 JHS |
399 | if (ret == TC_ACT_REPEAT) |
400 | goto repeat; /* we need a ttl - JHS */ | |
401 | if (ret != TC_ACT_PIPE) | |
402 | goto exec_done; | |
1da177e4 LT |
403 | } |
404 | exec_done: | |
1da177e4 LT |
405 | return ret; |
406 | } | |
62e3ba1b | 407 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 | 408 | |
55334a5d | 409 | int tcf_action_destroy(struct list_head *actions, int bind) |
1da177e4 | 410 | { |
33be6271 | 411 | struct tc_action *a, *tmp; |
55334a5d | 412 | int ret = 0; |
1da177e4 | 413 | |
33be6271 | 414 | list_for_each_entry_safe(a, tmp, actions, list) { |
55334a5d WC |
415 | ret = tcf_hash_release(a, bind); |
416 | if (ret == ACT_P_DELETED) | |
63acd680 | 417 | module_put(a->ops->owner); |
55334a5d WC |
418 | else if (ret < 0) |
419 | return ret; | |
63acd680 JHS |
420 | list_del(&a->list); |
421 | kfree(a); | |
1da177e4 | 422 | } |
55334a5d | 423 | return ret; |
1da177e4 LT |
424 | } |
425 | ||
426 | int | |
427 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
428 | { | |
1da177e4 LT |
429 | return a->ops->dump(skb, a, bind, ref); |
430 | } | |
431 | ||
432 | int | |
433 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
434 | { | |
435 | int err = -EINVAL; | |
27a884dc | 436 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 437 | struct nlattr *nest; |
1da177e4 | 438 | |
1b34ec43 DM |
439 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) |
440 | goto nla_put_failure; | |
1da177e4 | 441 | if (tcf_action_copy_stats(skb, a, 0)) |
7ba699c6 | 442 | goto nla_put_failure; |
4b3550ef PM |
443 | nest = nla_nest_start(skb, TCA_OPTIONS); |
444 | if (nest == NULL) | |
445 | goto nla_put_failure; | |
cc7ec456 ED |
446 | err = tcf_action_dump_old(skb, a, bind, ref); |
447 | if (err > 0) { | |
4b3550ef | 448 | nla_nest_end(skb, nest); |
1da177e4 LT |
449 | return err; |
450 | } | |
451 | ||
7ba699c6 | 452 | nla_put_failure: |
dc5fc579 | 453 | nlmsg_trim(skb, b); |
1da177e4 LT |
454 | return -1; |
455 | } | |
62e3ba1b | 456 | EXPORT_SYMBOL(tcf_action_dump_1); |
1da177e4 LT |
457 | |
458 | int | |
33be6271 | 459 | tcf_action_dump(struct sk_buff *skb, struct list_head *actions, int bind, int ref) |
1da177e4 LT |
460 | { |
461 | struct tc_action *a; | |
462 | int err = -EINVAL; | |
4b3550ef | 463 | struct nlattr *nest; |
1da177e4 | 464 | |
33be6271 | 465 | list_for_each_entry(a, actions, list) { |
4b3550ef PM |
466 | nest = nla_nest_start(skb, a->order); |
467 | if (nest == NULL) | |
468 | goto nla_put_failure; | |
1da177e4 LT |
469 | err = tcf_action_dump_1(skb, a, bind, ref); |
470 | if (err < 0) | |
4fe683f5 | 471 | goto errout; |
4b3550ef | 472 | nla_nest_end(skb, nest); |
1da177e4 LT |
473 | } |
474 | ||
475 | return 0; | |
476 | ||
7ba699c6 | 477 | nla_put_failure: |
4fe683f5 TG |
478 | err = -EINVAL; |
479 | errout: | |
4b3550ef | 480 | nla_nest_cancel(skb, nest); |
4fe683f5 | 481 | return err; |
1da177e4 LT |
482 | } |
483 | ||
c1b52739 BL |
484 | struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla, |
485 | struct nlattr *est, char *name, int ovr, | |
486 | int bind) | |
1da177e4 LT |
487 | { |
488 | struct tc_action *a; | |
489 | struct tc_action_ops *a_o; | |
490 | char act_name[IFNAMSIZ]; | |
cc7ec456 | 491 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 492 | struct nlattr *kind; |
ab27cfb8 | 493 | int err; |
1da177e4 | 494 | |
1da177e4 | 495 | if (name == NULL) { |
cee63723 PM |
496 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
497 | if (err < 0) | |
1da177e4 | 498 | goto err_out; |
cee63723 | 499 | err = -EINVAL; |
7ba699c6 | 500 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
501 | if (kind == NULL) |
502 | goto err_out; | |
7ba699c6 | 503 | if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) |
1da177e4 LT |
504 | goto err_out; |
505 | } else { | |
cee63723 | 506 | err = -EINVAL; |
1da177e4 LT |
507 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) |
508 | goto err_out; | |
509 | } | |
510 | ||
511 | a_o = tc_lookup_action_n(act_name); | |
512 | if (a_o == NULL) { | |
95a5afca | 513 | #ifdef CONFIG_MODULES |
1da177e4 | 514 | rtnl_unlock(); |
4bba3925 | 515 | request_module("act_%s", act_name); |
1da177e4 LT |
516 | rtnl_lock(); |
517 | ||
518 | a_o = tc_lookup_action_n(act_name); | |
519 | ||
520 | /* We dropped the RTNL semaphore in order to | |
521 | * perform the module load. So, even if we | |
522 | * succeeded in loading the module we have to | |
523 | * tell the caller to replay the request. We | |
524 | * indicate this using -EAGAIN. | |
525 | */ | |
526 | if (a_o != NULL) { | |
ab27cfb8 | 527 | err = -EAGAIN; |
1da177e4 LT |
528 | goto err_mod; |
529 | } | |
530 | #endif | |
ab27cfb8 | 531 | err = -ENOENT; |
1da177e4 LT |
532 | goto err_out; |
533 | } | |
534 | ||
ab27cfb8 | 535 | err = -ENOMEM; |
0da974f4 | 536 | a = kzalloc(sizeof(*a), GFP_KERNEL); |
1da177e4 LT |
537 | if (a == NULL) |
538 | goto err_mod; | |
1da177e4 | 539 | |
c779f7af | 540 | a->ops = a_o; |
33be6271 | 541 | INIT_LIST_HEAD(&a->list); |
1da177e4 LT |
542 | /* backward compatibility for policer */ |
543 | if (name == NULL) | |
c1b52739 | 544 | err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, a, ovr, bind); |
1da177e4 | 545 | else |
c1b52739 | 546 | err = a_o->init(net, nla, est, a, ovr, bind); |
ab27cfb8 | 547 | if (err < 0) |
1da177e4 LT |
548 | goto err_free; |
549 | ||
550 | /* module count goes up only when brand new policy is created | |
cc7ec456 ED |
551 | * if it exists and is only bound to in a_o->init() then |
552 | * ACT_P_CREATED is not returned (a zero is). | |
553 | */ | |
ab27cfb8 | 554 | if (err != ACT_P_CREATED) |
1da177e4 | 555 | module_put(a_o->owner); |
1da177e4 | 556 | |
1da177e4 LT |
557 | return a; |
558 | ||
559 | err_free: | |
560 | kfree(a); | |
561 | err_mod: | |
562 | module_put(a_o->owner); | |
563 | err_out: | |
ab27cfb8 | 564 | return ERR_PTR(err); |
1da177e4 LT |
565 | } |
566 | ||
33be6271 | 567 | int tcf_action_init(struct net *net, struct nlattr *nla, |
c1b52739 | 568 | struct nlattr *est, char *name, int ovr, |
33be6271 | 569 | int bind, struct list_head *actions) |
1da177e4 | 570 | { |
cc7ec456 | 571 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 | 572 | struct tc_action *act; |
cee63723 | 573 | int err; |
1da177e4 LT |
574 | int i; |
575 | ||
cee63723 PM |
576 | err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
577 | if (err < 0) | |
33be6271 | 578 | return err; |
1da177e4 | 579 | |
7ba699c6 | 580 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
c1b52739 | 581 | act = tcf_action_init_1(net, tb[i], est, name, ovr, bind); |
33be6271 WC |
582 | if (IS_ERR(act)) { |
583 | err = PTR_ERR(act); | |
1da177e4 | 584 | goto err; |
33be6271 | 585 | } |
7ba699c6 | 586 | act->order = i; |
33be6271 | 587 | list_add_tail(&act->list, actions); |
1da177e4 | 588 | } |
33be6271 | 589 | return 0; |
1da177e4 LT |
590 | |
591 | err: | |
33be6271 WC |
592 | tcf_action_destroy(actions, bind); |
593 | return err; | |
1da177e4 LT |
594 | } |
595 | ||
596 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a, | |
597 | int compat_mode) | |
598 | { | |
599 | int err = 0; | |
600 | struct gnet_dump d; | |
7eb8896d | 601 | struct tcf_common *p = a->priv; |
10297b99 | 602 | |
7eb8896d | 603 | if (p == NULL) |
1da177e4 LT |
604 | goto errout; |
605 | ||
606 | /* compat_mode being true specifies a call that is supposed | |
06fe9fb4 | 607 | * to add additional backward compatibility statistic TLVs. |
1da177e4 LT |
608 | */ |
609 | if (compat_mode) { | |
610 | if (a->type == TCA_OLD_COMPAT) | |
611 | err = gnet_stats_start_copy_compat(skb, 0, | |
7eb8896d | 612 | TCA_STATS, TCA_XSTATS, &p->tcfc_lock, &d); |
1da177e4 LT |
613 | else |
614 | return 0; | |
615 | } else | |
616 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
7eb8896d | 617 | &p->tcfc_lock, &d); |
1da177e4 LT |
618 | |
619 | if (err < 0) | |
620 | goto errout; | |
621 | ||
7eb8896d WC |
622 | if (gnet_stats_copy_basic(&d, &p->tcfc_bstats) < 0 || |
623 | gnet_stats_copy_rate_est(&d, &p->tcfc_bstats, | |
624 | &p->tcfc_rate_est) < 0 || | |
625 | gnet_stats_copy_queue(&d, &p->tcfc_qstats) < 0) | |
1da177e4 LT |
626 | goto errout; |
627 | ||
628 | if (gnet_stats_finish_copy(&d) < 0) | |
629 | goto errout; | |
630 | ||
631 | return 0; | |
632 | ||
633 | errout: | |
634 | return -1; | |
635 | } | |
636 | ||
637 | static int | |
33be6271 | 638 | tca_get_fill(struct sk_buff *skb, struct list_head *actions, u32 portid, u32 seq, |
10297b99 | 639 | u16 flags, int event, int bind, int ref) |
1da177e4 LT |
640 | { |
641 | struct tcamsg *t; | |
642 | struct nlmsghdr *nlh; | |
27a884dc | 643 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 644 | struct nlattr *nest; |
1da177e4 | 645 | |
15e47304 | 646 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags); |
8b00a53c DM |
647 | if (!nlh) |
648 | goto out_nlmsg_trim; | |
649 | t = nlmsg_data(nlh); | |
1da177e4 | 650 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
651 | t->tca__pad1 = 0; |
652 | t->tca__pad2 = 0; | |
10297b99 | 653 | |
4b3550ef PM |
654 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
655 | if (nest == NULL) | |
8b00a53c | 656 | goto out_nlmsg_trim; |
1da177e4 | 657 | |
33be6271 | 658 | if (tcf_action_dump(skb, actions, bind, ref) < 0) |
8b00a53c | 659 | goto out_nlmsg_trim; |
1da177e4 | 660 | |
4b3550ef | 661 | nla_nest_end(skb, nest); |
10297b99 | 662 | |
27a884dc | 663 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
664 | return skb->len; |
665 | ||
8b00a53c | 666 | out_nlmsg_trim: |
dc5fc579 | 667 | nlmsg_trim(skb, b); |
1da177e4 LT |
668 | return -1; |
669 | } | |
670 | ||
671 | static int | |
15e47304 | 672 | act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n, |
33be6271 | 673 | struct list_head *actions, int event) |
1da177e4 LT |
674 | { |
675 | struct sk_buff *skb; | |
1da177e4 LT |
676 | |
677 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
678 | if (!skb) | |
679 | return -ENOBUFS; | |
33be6271 | 680 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { |
1da177e4 LT |
681 | kfree_skb(skb); |
682 | return -EINVAL; | |
683 | } | |
2942e900 | 684 | |
15e47304 | 685 | return rtnl_unicast(skb, net, portid); |
1da177e4 LT |
686 | } |
687 | ||
03701d6e WC |
688 | static struct tc_action *create_a(int i) |
689 | { | |
690 | struct tc_action *act; | |
691 | ||
692 | act = kzalloc(sizeof(*act), GFP_KERNEL); | |
693 | if (act == NULL) { | |
694 | pr_debug("create_a: failed to alloc!\n"); | |
695 | return NULL; | |
696 | } | |
697 | act->order = i; | |
698 | INIT_LIST_HEAD(&act->list); | |
699 | return act; | |
700 | } | |
701 | ||
1da177e4 | 702 | static struct tc_action * |
15e47304 | 703 | tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 portid) |
1da177e4 | 704 | { |
cc7ec456 | 705 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
1da177e4 LT |
706 | struct tc_action *a; |
707 | int index; | |
ab27cfb8 | 708 | int err; |
1da177e4 | 709 | |
cee63723 PM |
710 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
711 | if (err < 0) | |
ab27cfb8 | 712 | goto err_out; |
1da177e4 | 713 | |
cee63723 | 714 | err = -EINVAL; |
7ba699c6 PM |
715 | if (tb[TCA_ACT_INDEX] == NULL || |
716 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) | |
ab27cfb8 | 717 | goto err_out; |
1587bac4 | 718 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 719 | |
ab27cfb8 | 720 | err = -ENOMEM; |
03701d6e | 721 | a = create_a(0); |
1da177e4 | 722 | if (a == NULL) |
ab27cfb8 | 723 | goto err_out; |
1da177e4 | 724 | |
ab27cfb8 | 725 | err = -EINVAL; |
7ba699c6 | 726 | a->ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
63acd680 | 727 | if (a->ops == NULL) /* could happen in batch of actions */ |
1da177e4 | 728 | goto err_free; |
ab27cfb8 | 729 | err = -ENOENT; |
1da177e4 LT |
730 | if (a->ops->lookup(a, index) == 0) |
731 | goto err_mod; | |
732 | ||
733 | module_put(a->ops->owner); | |
1da177e4 | 734 | return a; |
ab27cfb8 | 735 | |
1da177e4 LT |
736 | err_mod: |
737 | module_put(a->ops->owner); | |
738 | err_free: | |
739 | kfree(a); | |
ab27cfb8 PM |
740 | err_out: |
741 | return ERR_PTR(err); | |
1da177e4 LT |
742 | } |
743 | ||
33be6271 | 744 | static void cleanup_a(struct list_head *actions) |
1da177e4 | 745 | { |
33be6271 | 746 | struct tc_action *a, *tmp; |
1da177e4 | 747 | |
33be6271 WC |
748 | list_for_each_entry_safe(a, tmp, actions, list) { |
749 | list_del(&a->list); | |
1da177e4 LT |
750 | kfree(a); |
751 | } | |
752 | } | |
753 | ||
7316ae88 | 754 | static int tca_action_flush(struct net *net, struct nlattr *nla, |
15e47304 | 755 | struct nlmsghdr *n, u32 portid) |
1da177e4 LT |
756 | { |
757 | struct sk_buff *skb; | |
758 | unsigned char *b; | |
759 | struct nlmsghdr *nlh; | |
760 | struct tcamsg *t; | |
761 | struct netlink_callback dcb; | |
4b3550ef | 762 | struct nlattr *nest; |
cc7ec456 | 763 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 764 | struct nlattr *kind; |
03701d6e | 765 | struct tc_action a; |
36723873 | 766 | int err = -ENOMEM; |
1da177e4 | 767 | |
1da177e4 LT |
768 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
769 | if (!skb) { | |
6ff9c364 | 770 | pr_debug("tca_action_flush: failed skb alloc\n"); |
36723873 | 771 | return err; |
1da177e4 LT |
772 | } |
773 | ||
27a884dc | 774 | b = skb_tail_pointer(skb); |
1da177e4 | 775 | |
cee63723 PM |
776 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
777 | if (err < 0) | |
1da177e4 LT |
778 | goto err_out; |
779 | ||
cee63723 | 780 | err = -EINVAL; |
7ba699c6 | 781 | kind = tb[TCA_ACT_KIND]; |
03701d6e WC |
782 | memset(&a, 0, sizeof(struct tc_action)); |
783 | INIT_LIST_HEAD(&a.list); | |
784 | a.ops = tc_lookup_action(kind); | |
785 | if (a.ops == NULL) /*some idjot trying to flush unknown action */ | |
1da177e4 LT |
786 | goto err_out; |
787 | ||
15e47304 | 788 | nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t), 0); |
8b00a53c DM |
789 | if (!nlh) |
790 | goto out_module_put; | |
791 | t = nlmsg_data(nlh); | |
1da177e4 | 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) | |
8b00a53c | 798 | goto out_module_put; |
1da177e4 | 799 | |
03701d6e | 800 | err = a.ops->walk(skb, &dcb, RTM_DELACTION, &a); |
1da177e4 | 801 | if (err < 0) |
8b00a53c | 802 | goto out_module_put; |
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 | 809 | nlh->nlmsg_flags |= NLM_F_ROOT; |
03701d6e | 810 | module_put(a.ops->owner); |
15e47304 | 811 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 812 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
813 | if (err > 0) |
814 | return 0; | |
815 | ||
816 | return err; | |
817 | ||
8b00a53c | 818 | out_module_put: |
03701d6e | 819 | module_put(a.ops->owner); |
1da177e4 | 820 | err_out: |
f97017cd | 821 | noflush_out: |
1da177e4 | 822 | kfree_skb(skb); |
1da177e4 LT |
823 | return err; |
824 | } | |
825 | ||
a56e1953 WC |
826 | static int |
827 | tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions, | |
828 | u32 portid) | |
829 | { | |
830 | int ret; | |
831 | struct sk_buff *skb; | |
832 | ||
833 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
834 | if (!skb) | |
835 | return -ENOBUFS; | |
836 | ||
837 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION, | |
838 | 0, 1) <= 0) { | |
839 | kfree_skb(skb); | |
840 | return -EINVAL; | |
841 | } | |
842 | ||
843 | /* now do the delete */ | |
55334a5d WC |
844 | ret = tcf_action_destroy(actions, 0); |
845 | if (ret < 0) { | |
846 | kfree_skb(skb); | |
847 | return ret; | |
848 | } | |
a56e1953 WC |
849 | |
850 | ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
851 | n->nlmsg_flags & NLM_F_ECHO); | |
852 | if (ret > 0) | |
853 | return 0; | |
854 | return ret; | |
855 | } | |
856 | ||
1da177e4 | 857 | static int |
7316ae88 | 858 | tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
15e47304 | 859 | u32 portid, int event) |
1da177e4 | 860 | { |
cee63723 | 861 | int i, ret; |
cc7ec456 | 862 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 WC |
863 | struct tc_action *act; |
864 | LIST_HEAD(actions); | |
1da177e4 | 865 | |
cee63723 PM |
866 | ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
867 | if (ret < 0) | |
868 | return ret; | |
1da177e4 | 869 | |
cc7ec456 | 870 | if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) { |
f97017cd | 871 | if (tb[1] != NULL) |
15e47304 | 872 | return tca_action_flush(net, tb[1], n, portid); |
f97017cd JHS |
873 | else |
874 | return -EINVAL; | |
1da177e4 LT |
875 | } |
876 | ||
7ba699c6 | 877 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
15e47304 | 878 | act = tcf_action_get_1(tb[i], n, portid); |
ab27cfb8 PM |
879 | if (IS_ERR(act)) { |
880 | ret = PTR_ERR(act); | |
1da177e4 | 881 | goto err; |
ab27cfb8 | 882 | } |
7ba699c6 | 883 | act->order = i; |
33be6271 | 884 | list_add_tail(&act->list, &actions); |
1da177e4 LT |
885 | } |
886 | ||
887 | if (event == RTM_GETACTION) | |
33be6271 | 888 | ret = act_get_notify(net, portid, n, &actions, event); |
1da177e4 | 889 | else { /* delete */ |
a56e1953 WC |
890 | ret = tcf_del_notify(net, n, &actions, portid); |
891 | if (ret) | |
1da177e4 | 892 | goto err; |
1da177e4 LT |
893 | return ret; |
894 | } | |
895 | err: | |
33be6271 | 896 | cleanup_a(&actions); |
1da177e4 LT |
897 | return ret; |
898 | } | |
899 | ||
a56e1953 WC |
900 | static int |
901 | tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions, | |
902 | u32 portid) | |
1da177e4 | 903 | { |
1da177e4 | 904 | struct sk_buff *skb; |
1da177e4 LT |
905 | int err = 0; |
906 | ||
907 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
908 | if (!skb) | |
909 | return -ENOBUFS; | |
910 | ||
a56e1953 WC |
911 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags, |
912 | RTM_NEWACTION, 0, 0) <= 0) { | |
913 | kfree_skb(skb); | |
914 | return -EINVAL; | |
915 | } | |
10297b99 | 916 | |
a56e1953 WC |
917 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
918 | n->nlmsg_flags & NLM_F_ECHO); | |
1da177e4 LT |
919 | if (err > 0) |
920 | err = 0; | |
921 | return err; | |
1da177e4 LT |
922 | } |
923 | ||
1da177e4 | 924 | static int |
7316ae88 | 925 | tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
15e47304 | 926 | u32 portid, int ovr) |
1da177e4 LT |
927 | { |
928 | int ret = 0; | |
33be6271 | 929 | LIST_HEAD(actions); |
1da177e4 | 930 | |
33be6271 WC |
931 | ret = tcf_action_init(net, nla, NULL, NULL, ovr, 0, &actions); |
932 | if (ret) | |
ab27cfb8 | 933 | goto done; |
1da177e4 LT |
934 | |
935 | /* dump then free all the actions after update; inserted policy | |
936 | * stays intact | |
cc7ec456 | 937 | */ |
a56e1953 | 938 | ret = tcf_add_notify(net, n, &actions, portid); |
33be6271 | 939 | cleanup_a(&actions); |
1da177e4 LT |
940 | done: |
941 | return ret; | |
942 | } | |
943 | ||
661d2967 | 944 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 945 | { |
3b1e0a65 | 946 | struct net *net = sock_net(skb->sk); |
7ba699c6 | 947 | struct nlattr *tca[TCA_ACT_MAX + 1]; |
15e47304 | 948 | u32 portid = skb ? NETLINK_CB(skb).portid : 0; |
1da177e4 LT |
949 | int ret = 0, ovr = 0; |
950 | ||
90f62cf3 | 951 | if ((n->nlmsg_type != RTM_GETACTION) && !netlink_capable(skb, CAP_NET_ADMIN)) |
dfc47ef8 EB |
952 | return -EPERM; |
953 | ||
7ba699c6 PM |
954 | ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL); |
955 | if (ret < 0) | |
956 | return ret; | |
957 | ||
958 | if (tca[TCA_ACT_TAB] == NULL) { | |
6ff9c364 | 959 | pr_notice("tc_ctl_action: received NO action attribs\n"); |
1da177e4 LT |
960 | return -EINVAL; |
961 | } | |
962 | ||
cc7ec456 | 963 | /* n->nlmsg_flags & NLM_F_CREATE */ |
1da177e4 LT |
964 | switch (n->nlmsg_type) { |
965 | case RTM_NEWACTION: | |
966 | /* we are going to assume all other flags | |
25985edc | 967 | * imply create only if it doesn't exist |
1da177e4 LT |
968 | * Note that CREATE | EXCL implies that |
969 | * but since we want avoid ambiguity (eg when flags | |
970 | * is zero) then just set this | |
971 | */ | |
cc7ec456 | 972 | if (n->nlmsg_flags & NLM_F_REPLACE) |
1da177e4 LT |
973 | ovr = 1; |
974 | replay: | |
15e47304 | 975 | ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr); |
1da177e4 LT |
976 | if (ret == -EAGAIN) |
977 | goto replay; | |
978 | break; | |
979 | case RTM_DELACTION: | |
7316ae88 | 980 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
15e47304 | 981 | portid, RTM_DELACTION); |
1da177e4 LT |
982 | break; |
983 | case RTM_GETACTION: | |
7316ae88 | 984 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
15e47304 | 985 | portid, RTM_GETACTION); |
1da177e4 LT |
986 | break; |
987 | default: | |
988 | BUG(); | |
989 | } | |
990 | ||
991 | return ret; | |
992 | } | |
993 | ||
7ba699c6 | 994 | static struct nlattr * |
3a6c2b41 | 995 | find_dump_kind(const struct nlmsghdr *n) |
1da177e4 | 996 | { |
cc7ec456 | 997 | struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1]; |
7ba699c6 PM |
998 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
999 | struct nlattr *nla[TCAA_MAX + 1]; | |
1000 | struct nlattr *kind; | |
1da177e4 | 1001 | |
c96c9471 | 1002 | if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0) |
1da177e4 | 1003 | return NULL; |
7ba699c6 | 1004 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
1005 | if (tb1 == NULL) |
1006 | return NULL; | |
1007 | ||
7ba699c6 PM |
1008 | if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), |
1009 | NLMSG_ALIGN(nla_len(tb1)), NULL) < 0) | |
1da177e4 | 1010 | return NULL; |
1da177e4 | 1011 | |
6d834e04 PM |
1012 | if (tb[1] == NULL) |
1013 | return NULL; | |
1014 | if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]), | |
1015 | nla_len(tb[1]), NULL) < 0) | |
1da177e4 | 1016 | return NULL; |
7ba699c6 | 1017 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 1018 | |
26dab893 | 1019 | return kind; |
1da177e4 LT |
1020 | } |
1021 | ||
1022 | static int | |
1023 | tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) | |
1024 | { | |
1025 | struct nlmsghdr *nlh; | |
27a884dc | 1026 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1027 | struct nlattr *nest; |
1da177e4 LT |
1028 | struct tc_action_ops *a_o; |
1029 | struct tc_action a; | |
1030 | int ret = 0; | |
8b00a53c | 1031 | struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh); |
7ba699c6 | 1032 | struct nlattr *kind = find_dump_kind(cb->nlh); |
1da177e4 LT |
1033 | |
1034 | if (kind == NULL) { | |
6ff9c364 | 1035 | pr_info("tc_dump_action: action bad kind\n"); |
1da177e4 LT |
1036 | return 0; |
1037 | } | |
1038 | ||
26dab893 | 1039 | a_o = tc_lookup_action(kind); |
cc7ec456 | 1040 | if (a_o == NULL) |
1da177e4 | 1041 | return 0; |
1da177e4 LT |
1042 | |
1043 | memset(&a, 0, sizeof(struct tc_action)); | |
1044 | a.ops = a_o; | |
1045 | ||
15e47304 | 1046 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
8b00a53c DM |
1047 | cb->nlh->nlmsg_type, sizeof(*t), 0); |
1048 | if (!nlh) | |
1049 | goto out_module_put; | |
1050 | t = nlmsg_data(nlh); | |
1da177e4 | 1051 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1052 | t->tca__pad1 = 0; |
1053 | t->tca__pad2 = 0; | |
1da177e4 | 1054 | |
4b3550ef PM |
1055 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
1056 | if (nest == NULL) | |
8b00a53c | 1057 | goto out_module_put; |
1da177e4 LT |
1058 | |
1059 | ret = a_o->walk(skb, cb, RTM_GETACTION, &a); | |
1060 | if (ret < 0) | |
8b00a53c | 1061 | goto out_module_put; |
1da177e4 LT |
1062 | |
1063 | if (ret > 0) { | |
4b3550ef | 1064 | nla_nest_end(skb, nest); |
1da177e4 LT |
1065 | ret = skb->len; |
1066 | } else | |
4b3550ef | 1067 | nla_nest_cancel(skb, nest); |
1da177e4 | 1068 | |
27a884dc | 1069 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
15e47304 | 1070 | if (NETLINK_CB(cb->skb).portid && ret) |
1da177e4 LT |
1071 | nlh->nlmsg_flags |= NLM_F_MULTI; |
1072 | module_put(a_o->owner); | |
1073 | return skb->len; | |
1074 | ||
8b00a53c | 1075 | out_module_put: |
1da177e4 | 1076 | module_put(a_o->owner); |
dc5fc579 | 1077 | nlmsg_trim(skb, b); |
1da177e4 LT |
1078 | return skb->len; |
1079 | } | |
1080 | ||
1081 | static int __init tc_action_init(void) | |
1082 | { | |
c7ac8679 GR |
1083 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL); |
1084 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL); | |
1085 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, | |
1086 | NULL); | |
1da177e4 | 1087 | |
1da177e4 LT |
1088 | return 0; |
1089 | } | |
1090 | ||
1091 | subsys_initcall(tc_action_init); |