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 | 254 | if (est) { |
22e0f8b9 JF |
255 | int err = gen_new_estimator(&p->tcfc_bstats, NULL, |
256 | &p->tcfc_rate_est, | |
0e991ec6 SH |
257 | &p->tcfc_lock, est); |
258 | if (err) { | |
259 | kfree(p); | |
86062033 | 260 | return err; |
0e991ec6 SH |
261 | } |
262 | } | |
263 | ||
e9ce1cd3 | 264 | a->priv = (void *) p; |
86062033 | 265 | return 0; |
e9ce1cd3 DM |
266 | } |
267 | EXPORT_SYMBOL(tcf_hash_create); | |
268 | ||
86062033 | 269 | void tcf_hash_insert(struct tc_action *a) |
e9ce1cd3 | 270 | { |
86062033 WC |
271 | struct tcf_common *p = a->priv; |
272 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
e9ce1cd3 DM |
273 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); |
274 | ||
89819dc0 WC |
275 | spin_lock_bh(&hinfo->lock); |
276 | hlist_add_head(&p->tcfc_head, &hinfo->htab[h]); | |
277 | spin_unlock_bh(&hinfo->lock); | |
e9ce1cd3 DM |
278 | } |
279 | EXPORT_SYMBOL(tcf_hash_insert); | |
1da177e4 | 280 | |
1f747c26 | 281 | static LIST_HEAD(act_base); |
1da177e4 LT |
282 | static DEFINE_RWLOCK(act_mod_lock); |
283 | ||
4f1e9d89 | 284 | int tcf_register_action(struct tc_action_ops *act, unsigned int mask) |
1da177e4 | 285 | { |
1f747c26 | 286 | struct tc_action_ops *a; |
4f1e9d89 | 287 | int err; |
1da177e4 | 288 | |
a5b5c958 WC |
289 | /* Must supply act, dump and init */ |
290 | if (!act->act || !act->dump || !act->init) | |
76c82d7a JHS |
291 | return -EINVAL; |
292 | ||
382ca8a1 | 293 | /* Supply defaults */ |
63ef6174 JHS |
294 | if (!act->lookup) |
295 | act->lookup = tcf_hash_search; | |
382ca8a1 JHS |
296 | if (!act->walk) |
297 | act->walk = tcf_generic_walker; | |
63ef6174 | 298 | |
4f1e9d89 WC |
299 | act->hinfo = kmalloc(sizeof(struct tcf_hashinfo), GFP_KERNEL); |
300 | if (!act->hinfo) | |
301 | return -ENOMEM; | |
302 | err = tcf_hashinfo_init(act->hinfo, mask); | |
303 | if (err) { | |
304 | kfree(act->hinfo); | |
305 | return err; | |
306 | } | |
307 | ||
1da177e4 | 308 | write_lock(&act_mod_lock); |
1f747c26 | 309 | list_for_each_entry(a, &act_base, head) { |
1da177e4 LT |
310 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { |
311 | write_unlock(&act_mod_lock); | |
4f1e9d89 WC |
312 | tcf_hashinfo_destroy(act->hinfo); |
313 | kfree(act->hinfo); | |
1da177e4 LT |
314 | return -EEXIST; |
315 | } | |
316 | } | |
1f747c26 | 317 | list_add_tail(&act->head, &act_base); |
1da177e4 LT |
318 | write_unlock(&act_mod_lock); |
319 | return 0; | |
320 | } | |
62e3ba1b | 321 | EXPORT_SYMBOL(tcf_register_action); |
1da177e4 LT |
322 | |
323 | int tcf_unregister_action(struct tc_action_ops *act) | |
324 | { | |
1f747c26 | 325 | struct tc_action_ops *a; |
1da177e4 LT |
326 | int err = -ENOENT; |
327 | ||
328 | write_lock(&act_mod_lock); | |
a792866a ED |
329 | list_for_each_entry(a, &act_base, head) { |
330 | if (a == act) { | |
331 | list_del(&act->head); | |
4f1e9d89 WC |
332 | tcf_hashinfo_destroy(act->hinfo); |
333 | kfree(act->hinfo); | |
a792866a | 334 | err = 0; |
1da177e4 | 335 | break; |
a792866a | 336 | } |
1da177e4 LT |
337 | } |
338 | write_unlock(&act_mod_lock); | |
339 | return err; | |
340 | } | |
62e3ba1b | 341 | EXPORT_SYMBOL(tcf_unregister_action); |
1da177e4 LT |
342 | |
343 | /* lookup by name */ | |
344 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
345 | { | |
a792866a | 346 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
347 | |
348 | if (kind) { | |
349 | read_lock(&act_mod_lock); | |
1f747c26 | 350 | list_for_each_entry(a, &act_base, head) { |
1da177e4 | 351 | if (strcmp(kind, a->kind) == 0) { |
a792866a ED |
352 | if (try_module_get(a->owner)) |
353 | res = a; | |
1da177e4 LT |
354 | break; |
355 | } | |
356 | } | |
357 | read_unlock(&act_mod_lock); | |
358 | } | |
a792866a | 359 | return res; |
1da177e4 LT |
360 | } |
361 | ||
7ba699c6 PM |
362 | /* lookup by nlattr */ |
363 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) | |
1da177e4 | 364 | { |
a792866a | 365 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
366 | |
367 | if (kind) { | |
368 | read_lock(&act_mod_lock); | |
1f747c26 | 369 | list_for_each_entry(a, &act_base, head) { |
7ba699c6 | 370 | if (nla_strcmp(kind, a->kind) == 0) { |
a792866a ED |
371 | if (try_module_get(a->owner)) |
372 | res = a; | |
1da177e4 LT |
373 | break; |
374 | } | |
375 | } | |
376 | read_unlock(&act_mod_lock); | |
377 | } | |
a792866a | 378 | return res; |
1da177e4 | 379 | } |
1da177e4 | 380 | |
33be6271 | 381 | int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions, |
10297b99 | 382 | struct tcf_result *res) |
1da177e4 | 383 | { |
dc7f9f6e | 384 | const struct tc_action *a; |
1da177e4 LT |
385 | int ret = -1; |
386 | ||
387 | if (skb->tc_verd & TC_NCLS) { | |
388 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
1da177e4 LT |
389 | ret = TC_ACT_OK; |
390 | goto exec_done; | |
391 | } | |
33be6271 | 392 | list_for_each_entry(a, actions, list) { |
1da177e4 | 393 | repeat: |
63acd680 JHS |
394 | ret = a->ops->act(skb, a, res); |
395 | if (TC_MUNGED & skb->tc_verd) { | |
396 | /* copied already, allow trampling */ | |
397 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); | |
398 | skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd); | |
1da177e4 | 399 | } |
63acd680 JHS |
400 | if (ret == TC_ACT_REPEAT) |
401 | goto repeat; /* we need a ttl - JHS */ | |
402 | if (ret != TC_ACT_PIPE) | |
403 | goto exec_done; | |
1da177e4 LT |
404 | } |
405 | exec_done: | |
1da177e4 LT |
406 | return ret; |
407 | } | |
62e3ba1b | 408 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 | 409 | |
55334a5d | 410 | int tcf_action_destroy(struct list_head *actions, int bind) |
1da177e4 | 411 | { |
33be6271 | 412 | struct tc_action *a, *tmp; |
55334a5d | 413 | int ret = 0; |
1da177e4 | 414 | |
33be6271 | 415 | list_for_each_entry_safe(a, tmp, actions, list) { |
55334a5d WC |
416 | ret = tcf_hash_release(a, bind); |
417 | if (ret == ACT_P_DELETED) | |
63acd680 | 418 | module_put(a->ops->owner); |
55334a5d WC |
419 | else if (ret < 0) |
420 | return ret; | |
63acd680 JHS |
421 | list_del(&a->list); |
422 | kfree(a); | |
1da177e4 | 423 | } |
55334a5d | 424 | return ret; |
1da177e4 LT |
425 | } |
426 | ||
427 | int | |
428 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
429 | { | |
1da177e4 LT |
430 | return a->ops->dump(skb, a, bind, ref); |
431 | } | |
432 | ||
433 | int | |
434 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
435 | { | |
436 | int err = -EINVAL; | |
27a884dc | 437 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 438 | struct nlattr *nest; |
1da177e4 | 439 | |
1b34ec43 DM |
440 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) |
441 | goto nla_put_failure; | |
1da177e4 | 442 | if (tcf_action_copy_stats(skb, a, 0)) |
7ba699c6 | 443 | goto nla_put_failure; |
4b3550ef PM |
444 | nest = nla_nest_start(skb, TCA_OPTIONS); |
445 | if (nest == NULL) | |
446 | goto nla_put_failure; | |
cc7ec456 ED |
447 | err = tcf_action_dump_old(skb, a, bind, ref); |
448 | if (err > 0) { | |
4b3550ef | 449 | nla_nest_end(skb, nest); |
1da177e4 LT |
450 | return err; |
451 | } | |
452 | ||
7ba699c6 | 453 | nla_put_failure: |
dc5fc579 | 454 | nlmsg_trim(skb, b); |
1da177e4 LT |
455 | return -1; |
456 | } | |
62e3ba1b | 457 | EXPORT_SYMBOL(tcf_action_dump_1); |
1da177e4 LT |
458 | |
459 | int | |
33be6271 | 460 | tcf_action_dump(struct sk_buff *skb, struct list_head *actions, int bind, int ref) |
1da177e4 LT |
461 | { |
462 | struct tc_action *a; | |
463 | int err = -EINVAL; | |
4b3550ef | 464 | struct nlattr *nest; |
1da177e4 | 465 | |
33be6271 | 466 | list_for_each_entry(a, actions, list) { |
4b3550ef PM |
467 | nest = nla_nest_start(skb, a->order); |
468 | if (nest == NULL) | |
469 | goto nla_put_failure; | |
1da177e4 LT |
470 | err = tcf_action_dump_1(skb, a, bind, ref); |
471 | if (err < 0) | |
4fe683f5 | 472 | goto errout; |
4b3550ef | 473 | nla_nest_end(skb, nest); |
1da177e4 LT |
474 | } |
475 | ||
476 | return 0; | |
477 | ||
7ba699c6 | 478 | nla_put_failure: |
4fe683f5 TG |
479 | err = -EINVAL; |
480 | errout: | |
4b3550ef | 481 | nla_nest_cancel(skb, nest); |
4fe683f5 | 482 | return err; |
1da177e4 LT |
483 | } |
484 | ||
c1b52739 BL |
485 | struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla, |
486 | struct nlattr *est, char *name, int ovr, | |
487 | int bind) | |
1da177e4 LT |
488 | { |
489 | struct tc_action *a; | |
490 | struct tc_action_ops *a_o; | |
491 | char act_name[IFNAMSIZ]; | |
cc7ec456 | 492 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 493 | struct nlattr *kind; |
ab27cfb8 | 494 | int err; |
1da177e4 | 495 | |
1da177e4 | 496 | if (name == NULL) { |
cee63723 PM |
497 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
498 | if (err < 0) | |
1da177e4 | 499 | goto err_out; |
cee63723 | 500 | err = -EINVAL; |
7ba699c6 | 501 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
502 | if (kind == NULL) |
503 | goto err_out; | |
7ba699c6 | 504 | if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) |
1da177e4 LT |
505 | goto err_out; |
506 | } else { | |
cee63723 | 507 | err = -EINVAL; |
1da177e4 LT |
508 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) |
509 | goto err_out; | |
510 | } | |
511 | ||
512 | a_o = tc_lookup_action_n(act_name); | |
513 | if (a_o == NULL) { | |
95a5afca | 514 | #ifdef CONFIG_MODULES |
1da177e4 | 515 | rtnl_unlock(); |
4bba3925 | 516 | request_module("act_%s", act_name); |
1da177e4 LT |
517 | rtnl_lock(); |
518 | ||
519 | a_o = tc_lookup_action_n(act_name); | |
520 | ||
521 | /* We dropped the RTNL semaphore in order to | |
522 | * perform the module load. So, even if we | |
523 | * succeeded in loading the module we have to | |
524 | * tell the caller to replay the request. We | |
525 | * indicate this using -EAGAIN. | |
526 | */ | |
527 | if (a_o != NULL) { | |
ab27cfb8 | 528 | err = -EAGAIN; |
1da177e4 LT |
529 | goto err_mod; |
530 | } | |
531 | #endif | |
ab27cfb8 | 532 | err = -ENOENT; |
1da177e4 LT |
533 | goto err_out; |
534 | } | |
535 | ||
ab27cfb8 | 536 | err = -ENOMEM; |
0da974f4 | 537 | a = kzalloc(sizeof(*a), GFP_KERNEL); |
1da177e4 LT |
538 | if (a == NULL) |
539 | goto err_mod; | |
1da177e4 | 540 | |
c779f7af | 541 | a->ops = a_o; |
33be6271 | 542 | INIT_LIST_HEAD(&a->list); |
1da177e4 LT |
543 | /* backward compatibility for policer */ |
544 | if (name == NULL) | |
c1b52739 | 545 | err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, a, ovr, bind); |
1da177e4 | 546 | else |
c1b52739 | 547 | err = a_o->init(net, nla, est, a, ovr, bind); |
ab27cfb8 | 548 | if (err < 0) |
1da177e4 LT |
549 | goto err_free; |
550 | ||
551 | /* module count goes up only when brand new policy is created | |
cc7ec456 ED |
552 | * if it exists and is only bound to in a_o->init() then |
553 | * ACT_P_CREATED is not returned (a zero is). | |
554 | */ | |
ab27cfb8 | 555 | if (err != ACT_P_CREATED) |
1da177e4 | 556 | module_put(a_o->owner); |
1da177e4 | 557 | |
1da177e4 LT |
558 | return a; |
559 | ||
560 | err_free: | |
561 | kfree(a); | |
562 | err_mod: | |
563 | module_put(a_o->owner); | |
564 | err_out: | |
ab27cfb8 | 565 | return ERR_PTR(err); |
1da177e4 LT |
566 | } |
567 | ||
33be6271 | 568 | int tcf_action_init(struct net *net, struct nlattr *nla, |
c1b52739 | 569 | struct nlattr *est, char *name, int ovr, |
33be6271 | 570 | int bind, struct list_head *actions) |
1da177e4 | 571 | { |
cc7ec456 | 572 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 | 573 | struct tc_action *act; |
cee63723 | 574 | int err; |
1da177e4 LT |
575 | int i; |
576 | ||
cee63723 PM |
577 | err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
578 | if (err < 0) | |
33be6271 | 579 | return err; |
1da177e4 | 580 | |
7ba699c6 | 581 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
c1b52739 | 582 | act = tcf_action_init_1(net, tb[i], est, name, ovr, bind); |
33be6271 WC |
583 | if (IS_ERR(act)) { |
584 | err = PTR_ERR(act); | |
1da177e4 | 585 | goto err; |
33be6271 | 586 | } |
7ba699c6 | 587 | act->order = i; |
33be6271 | 588 | list_add_tail(&act->list, actions); |
1da177e4 | 589 | } |
33be6271 | 590 | return 0; |
1da177e4 LT |
591 | |
592 | err: | |
33be6271 WC |
593 | tcf_action_destroy(actions, bind); |
594 | return err; | |
1da177e4 LT |
595 | } |
596 | ||
597 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a, | |
598 | int compat_mode) | |
599 | { | |
600 | int err = 0; | |
601 | struct gnet_dump d; | |
7eb8896d | 602 | struct tcf_common *p = a->priv; |
10297b99 | 603 | |
7eb8896d | 604 | if (p == NULL) |
1da177e4 LT |
605 | goto errout; |
606 | ||
607 | /* compat_mode being true specifies a call that is supposed | |
06fe9fb4 | 608 | * to add additional backward compatibility statistic TLVs. |
1da177e4 LT |
609 | */ |
610 | if (compat_mode) { | |
611 | if (a->type == TCA_OLD_COMPAT) | |
612 | err = gnet_stats_start_copy_compat(skb, 0, | |
7eb8896d | 613 | TCA_STATS, TCA_XSTATS, &p->tcfc_lock, &d); |
1da177e4 LT |
614 | else |
615 | return 0; | |
616 | } else | |
617 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
7eb8896d | 618 | &p->tcfc_lock, &d); |
1da177e4 LT |
619 | |
620 | if (err < 0) | |
621 | goto errout; | |
622 | ||
22e0f8b9 | 623 | if (gnet_stats_copy_basic(&d, NULL, &p->tcfc_bstats) < 0 || |
7eb8896d WC |
624 | gnet_stats_copy_rate_est(&d, &p->tcfc_bstats, |
625 | &p->tcfc_rate_est) < 0 || | |
b0ab6f92 | 626 | gnet_stats_copy_queue(&d, NULL, |
64015853 JF |
627 | &p->tcfc_qstats, |
628 | p->tcfc_qstats.qlen) < 0) | |
1da177e4 LT |
629 | goto errout; |
630 | ||
631 | if (gnet_stats_finish_copy(&d) < 0) | |
632 | goto errout; | |
633 | ||
634 | return 0; | |
635 | ||
636 | errout: | |
637 | return -1; | |
638 | } | |
639 | ||
640 | static int | |
33be6271 | 641 | tca_get_fill(struct sk_buff *skb, struct list_head *actions, u32 portid, u32 seq, |
10297b99 | 642 | u16 flags, int event, int bind, int ref) |
1da177e4 LT |
643 | { |
644 | struct tcamsg *t; | |
645 | struct nlmsghdr *nlh; | |
27a884dc | 646 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 647 | struct nlattr *nest; |
1da177e4 | 648 | |
15e47304 | 649 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags); |
8b00a53c DM |
650 | if (!nlh) |
651 | goto out_nlmsg_trim; | |
652 | t = nlmsg_data(nlh); | |
1da177e4 | 653 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
654 | t->tca__pad1 = 0; |
655 | t->tca__pad2 = 0; | |
10297b99 | 656 | |
4b3550ef PM |
657 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
658 | if (nest == NULL) | |
8b00a53c | 659 | goto out_nlmsg_trim; |
1da177e4 | 660 | |
33be6271 | 661 | if (tcf_action_dump(skb, actions, bind, ref) < 0) |
8b00a53c | 662 | goto out_nlmsg_trim; |
1da177e4 | 663 | |
4b3550ef | 664 | nla_nest_end(skb, nest); |
10297b99 | 665 | |
27a884dc | 666 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
667 | return skb->len; |
668 | ||
8b00a53c | 669 | out_nlmsg_trim: |
dc5fc579 | 670 | nlmsg_trim(skb, b); |
1da177e4 LT |
671 | return -1; |
672 | } | |
673 | ||
674 | static int | |
15e47304 | 675 | act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n, |
33be6271 | 676 | struct list_head *actions, int event) |
1da177e4 LT |
677 | { |
678 | struct sk_buff *skb; | |
1da177e4 LT |
679 | |
680 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
681 | if (!skb) | |
682 | return -ENOBUFS; | |
33be6271 | 683 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { |
1da177e4 LT |
684 | kfree_skb(skb); |
685 | return -EINVAL; | |
686 | } | |
2942e900 | 687 | |
15e47304 | 688 | return rtnl_unicast(skb, net, portid); |
1da177e4 LT |
689 | } |
690 | ||
03701d6e WC |
691 | static struct tc_action *create_a(int i) |
692 | { | |
693 | struct tc_action *act; | |
694 | ||
695 | act = kzalloc(sizeof(*act), GFP_KERNEL); | |
696 | if (act == NULL) { | |
697 | pr_debug("create_a: failed to alloc!\n"); | |
698 | return NULL; | |
699 | } | |
700 | act->order = i; | |
701 | INIT_LIST_HEAD(&act->list); | |
702 | return act; | |
703 | } | |
704 | ||
1da177e4 | 705 | static struct tc_action * |
15e47304 | 706 | tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 portid) |
1da177e4 | 707 | { |
cc7ec456 | 708 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
1da177e4 LT |
709 | struct tc_action *a; |
710 | int index; | |
ab27cfb8 | 711 | int err; |
1da177e4 | 712 | |
cee63723 PM |
713 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
714 | if (err < 0) | |
ab27cfb8 | 715 | goto err_out; |
1da177e4 | 716 | |
cee63723 | 717 | err = -EINVAL; |
7ba699c6 PM |
718 | if (tb[TCA_ACT_INDEX] == NULL || |
719 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) | |
ab27cfb8 | 720 | goto err_out; |
1587bac4 | 721 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 722 | |
ab27cfb8 | 723 | err = -ENOMEM; |
03701d6e | 724 | a = create_a(0); |
1da177e4 | 725 | if (a == NULL) |
ab27cfb8 | 726 | goto err_out; |
1da177e4 | 727 | |
ab27cfb8 | 728 | err = -EINVAL; |
7ba699c6 | 729 | a->ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
63acd680 | 730 | if (a->ops == NULL) /* could happen in batch of actions */ |
1da177e4 | 731 | goto err_free; |
ab27cfb8 | 732 | err = -ENOENT; |
1da177e4 LT |
733 | if (a->ops->lookup(a, index) == 0) |
734 | goto err_mod; | |
735 | ||
736 | module_put(a->ops->owner); | |
1da177e4 | 737 | return a; |
ab27cfb8 | 738 | |
1da177e4 LT |
739 | err_mod: |
740 | module_put(a->ops->owner); | |
741 | err_free: | |
742 | kfree(a); | |
ab27cfb8 PM |
743 | err_out: |
744 | return ERR_PTR(err); | |
1da177e4 LT |
745 | } |
746 | ||
33be6271 | 747 | static void cleanup_a(struct list_head *actions) |
1da177e4 | 748 | { |
33be6271 | 749 | struct tc_action *a, *tmp; |
1da177e4 | 750 | |
33be6271 WC |
751 | list_for_each_entry_safe(a, tmp, actions, list) { |
752 | list_del(&a->list); | |
1da177e4 LT |
753 | kfree(a); |
754 | } | |
755 | } | |
756 | ||
7316ae88 | 757 | static int tca_action_flush(struct net *net, struct nlattr *nla, |
15e47304 | 758 | struct nlmsghdr *n, u32 portid) |
1da177e4 LT |
759 | { |
760 | struct sk_buff *skb; | |
761 | unsigned char *b; | |
762 | struct nlmsghdr *nlh; | |
763 | struct tcamsg *t; | |
764 | struct netlink_callback dcb; | |
4b3550ef | 765 | struct nlattr *nest; |
cc7ec456 | 766 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 767 | struct nlattr *kind; |
03701d6e | 768 | struct tc_action a; |
36723873 | 769 | int err = -ENOMEM; |
1da177e4 | 770 | |
1da177e4 LT |
771 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
772 | if (!skb) { | |
6ff9c364 | 773 | pr_debug("tca_action_flush: failed skb alloc\n"); |
36723873 | 774 | return err; |
1da177e4 LT |
775 | } |
776 | ||
27a884dc | 777 | b = skb_tail_pointer(skb); |
1da177e4 | 778 | |
cee63723 PM |
779 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
780 | if (err < 0) | |
1da177e4 LT |
781 | goto err_out; |
782 | ||
cee63723 | 783 | err = -EINVAL; |
7ba699c6 | 784 | kind = tb[TCA_ACT_KIND]; |
03701d6e WC |
785 | memset(&a, 0, sizeof(struct tc_action)); |
786 | INIT_LIST_HEAD(&a.list); | |
787 | a.ops = tc_lookup_action(kind); | |
788 | if (a.ops == NULL) /*some idjot trying to flush unknown action */ | |
1da177e4 LT |
789 | goto err_out; |
790 | ||
15e47304 | 791 | nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t), 0); |
8b00a53c DM |
792 | if (!nlh) |
793 | goto out_module_put; | |
794 | t = nlmsg_data(nlh); | |
1da177e4 | 795 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
796 | t->tca__pad1 = 0; |
797 | t->tca__pad2 = 0; | |
1da177e4 | 798 | |
4b3550ef PM |
799 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
800 | if (nest == NULL) | |
8b00a53c | 801 | goto out_module_put; |
1da177e4 | 802 | |
03701d6e | 803 | err = a.ops->walk(skb, &dcb, RTM_DELACTION, &a); |
1da177e4 | 804 | if (err < 0) |
8b00a53c | 805 | goto out_module_put; |
f97017cd JHS |
806 | if (err == 0) |
807 | goto noflush_out; | |
1da177e4 | 808 | |
4b3550ef | 809 | nla_nest_end(skb, nest); |
1da177e4 | 810 | |
27a884dc | 811 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 | 812 | nlh->nlmsg_flags |= NLM_F_ROOT; |
03701d6e | 813 | module_put(a.ops->owner); |
15e47304 | 814 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 815 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
816 | if (err > 0) |
817 | return 0; | |
818 | ||
819 | return err; | |
820 | ||
8b00a53c | 821 | out_module_put: |
03701d6e | 822 | module_put(a.ops->owner); |
1da177e4 | 823 | err_out: |
f97017cd | 824 | noflush_out: |
1da177e4 | 825 | kfree_skb(skb); |
1da177e4 LT |
826 | return err; |
827 | } | |
828 | ||
a56e1953 WC |
829 | static int |
830 | tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions, | |
831 | u32 portid) | |
832 | { | |
833 | int ret; | |
834 | struct sk_buff *skb; | |
835 | ||
836 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
837 | if (!skb) | |
838 | return -ENOBUFS; | |
839 | ||
840 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION, | |
841 | 0, 1) <= 0) { | |
842 | kfree_skb(skb); | |
843 | return -EINVAL; | |
844 | } | |
845 | ||
846 | /* now do the delete */ | |
55334a5d WC |
847 | ret = tcf_action_destroy(actions, 0); |
848 | if (ret < 0) { | |
849 | kfree_skb(skb); | |
850 | return ret; | |
851 | } | |
a56e1953 WC |
852 | |
853 | ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
854 | n->nlmsg_flags & NLM_F_ECHO); | |
855 | if (ret > 0) | |
856 | return 0; | |
857 | return ret; | |
858 | } | |
859 | ||
1da177e4 | 860 | static int |
7316ae88 | 861 | tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
15e47304 | 862 | u32 portid, int event) |
1da177e4 | 863 | { |
cee63723 | 864 | int i, ret; |
cc7ec456 | 865 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 WC |
866 | struct tc_action *act; |
867 | LIST_HEAD(actions); | |
1da177e4 | 868 | |
cee63723 PM |
869 | ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
870 | if (ret < 0) | |
871 | return ret; | |
1da177e4 | 872 | |
cc7ec456 | 873 | if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) { |
f97017cd | 874 | if (tb[1] != NULL) |
15e47304 | 875 | return tca_action_flush(net, tb[1], n, portid); |
f97017cd JHS |
876 | else |
877 | return -EINVAL; | |
1da177e4 LT |
878 | } |
879 | ||
7ba699c6 | 880 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
15e47304 | 881 | act = tcf_action_get_1(tb[i], n, portid); |
ab27cfb8 PM |
882 | if (IS_ERR(act)) { |
883 | ret = PTR_ERR(act); | |
1da177e4 | 884 | goto err; |
ab27cfb8 | 885 | } |
7ba699c6 | 886 | act->order = i; |
33be6271 | 887 | list_add_tail(&act->list, &actions); |
1da177e4 LT |
888 | } |
889 | ||
890 | if (event == RTM_GETACTION) | |
33be6271 | 891 | ret = act_get_notify(net, portid, n, &actions, event); |
1da177e4 | 892 | else { /* delete */ |
a56e1953 WC |
893 | ret = tcf_del_notify(net, n, &actions, portid); |
894 | if (ret) | |
1da177e4 | 895 | goto err; |
1da177e4 LT |
896 | return ret; |
897 | } | |
898 | err: | |
33be6271 | 899 | cleanup_a(&actions); |
1da177e4 LT |
900 | return ret; |
901 | } | |
902 | ||
a56e1953 WC |
903 | static int |
904 | tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions, | |
905 | u32 portid) | |
1da177e4 | 906 | { |
1da177e4 | 907 | struct sk_buff *skb; |
1da177e4 LT |
908 | int err = 0; |
909 | ||
910 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
911 | if (!skb) | |
912 | return -ENOBUFS; | |
913 | ||
a56e1953 WC |
914 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags, |
915 | RTM_NEWACTION, 0, 0) <= 0) { | |
916 | kfree_skb(skb); | |
917 | return -EINVAL; | |
918 | } | |
10297b99 | 919 | |
a56e1953 WC |
920 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
921 | n->nlmsg_flags & NLM_F_ECHO); | |
1da177e4 LT |
922 | if (err > 0) |
923 | err = 0; | |
924 | return err; | |
1da177e4 LT |
925 | } |
926 | ||
1da177e4 | 927 | static int |
7316ae88 | 928 | tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
15e47304 | 929 | u32 portid, int ovr) |
1da177e4 LT |
930 | { |
931 | int ret = 0; | |
33be6271 | 932 | LIST_HEAD(actions); |
1da177e4 | 933 | |
33be6271 WC |
934 | ret = tcf_action_init(net, nla, NULL, NULL, ovr, 0, &actions); |
935 | if (ret) | |
ab27cfb8 | 936 | goto done; |
1da177e4 LT |
937 | |
938 | /* dump then free all the actions after update; inserted policy | |
939 | * stays intact | |
cc7ec456 | 940 | */ |
a56e1953 | 941 | ret = tcf_add_notify(net, n, &actions, portid); |
33be6271 | 942 | cleanup_a(&actions); |
1da177e4 LT |
943 | done: |
944 | return ret; | |
945 | } | |
946 | ||
661d2967 | 947 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 948 | { |
3b1e0a65 | 949 | struct net *net = sock_net(skb->sk); |
7ba699c6 | 950 | struct nlattr *tca[TCA_ACT_MAX + 1]; |
15e47304 | 951 | u32 portid = skb ? NETLINK_CB(skb).portid : 0; |
1da177e4 LT |
952 | int ret = 0, ovr = 0; |
953 | ||
90f62cf3 | 954 | if ((n->nlmsg_type != RTM_GETACTION) && !netlink_capable(skb, CAP_NET_ADMIN)) |
dfc47ef8 EB |
955 | return -EPERM; |
956 | ||
7ba699c6 PM |
957 | ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL); |
958 | if (ret < 0) | |
959 | return ret; | |
960 | ||
961 | if (tca[TCA_ACT_TAB] == NULL) { | |
6ff9c364 | 962 | pr_notice("tc_ctl_action: received NO action attribs\n"); |
1da177e4 LT |
963 | return -EINVAL; |
964 | } | |
965 | ||
cc7ec456 | 966 | /* n->nlmsg_flags & NLM_F_CREATE */ |
1da177e4 LT |
967 | switch (n->nlmsg_type) { |
968 | case RTM_NEWACTION: | |
969 | /* we are going to assume all other flags | |
25985edc | 970 | * imply create only if it doesn't exist |
1da177e4 LT |
971 | * Note that CREATE | EXCL implies that |
972 | * but since we want avoid ambiguity (eg when flags | |
973 | * is zero) then just set this | |
974 | */ | |
cc7ec456 | 975 | if (n->nlmsg_flags & NLM_F_REPLACE) |
1da177e4 LT |
976 | ovr = 1; |
977 | replay: | |
15e47304 | 978 | ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr); |
1da177e4 LT |
979 | if (ret == -EAGAIN) |
980 | goto replay; | |
981 | break; | |
982 | case RTM_DELACTION: | |
7316ae88 | 983 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
15e47304 | 984 | portid, RTM_DELACTION); |
1da177e4 LT |
985 | break; |
986 | case RTM_GETACTION: | |
7316ae88 | 987 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
15e47304 | 988 | portid, RTM_GETACTION); |
1da177e4 LT |
989 | break; |
990 | default: | |
991 | BUG(); | |
992 | } | |
993 | ||
994 | return ret; | |
995 | } | |
996 | ||
7ba699c6 | 997 | static struct nlattr * |
3a6c2b41 | 998 | find_dump_kind(const struct nlmsghdr *n) |
1da177e4 | 999 | { |
cc7ec456 | 1000 | struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1]; |
7ba699c6 PM |
1001 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
1002 | struct nlattr *nla[TCAA_MAX + 1]; | |
1003 | struct nlattr *kind; | |
1da177e4 | 1004 | |
c96c9471 | 1005 | if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0) |
1da177e4 | 1006 | return NULL; |
7ba699c6 | 1007 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
1008 | if (tb1 == NULL) |
1009 | return NULL; | |
1010 | ||
7ba699c6 PM |
1011 | if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), |
1012 | NLMSG_ALIGN(nla_len(tb1)), NULL) < 0) | |
1da177e4 | 1013 | return NULL; |
1da177e4 | 1014 | |
6d834e04 PM |
1015 | if (tb[1] == NULL) |
1016 | return NULL; | |
1017 | if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]), | |
1018 | nla_len(tb[1]), NULL) < 0) | |
1da177e4 | 1019 | return NULL; |
7ba699c6 | 1020 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 1021 | |
26dab893 | 1022 | return kind; |
1da177e4 LT |
1023 | } |
1024 | ||
1025 | static int | |
1026 | tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) | |
1027 | { | |
1028 | struct nlmsghdr *nlh; | |
27a884dc | 1029 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1030 | struct nlattr *nest; |
1da177e4 LT |
1031 | struct tc_action_ops *a_o; |
1032 | struct tc_action a; | |
1033 | int ret = 0; | |
8b00a53c | 1034 | struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh); |
7ba699c6 | 1035 | struct nlattr *kind = find_dump_kind(cb->nlh); |
1da177e4 LT |
1036 | |
1037 | if (kind == NULL) { | |
6ff9c364 | 1038 | pr_info("tc_dump_action: action bad kind\n"); |
1da177e4 LT |
1039 | return 0; |
1040 | } | |
1041 | ||
26dab893 | 1042 | a_o = tc_lookup_action(kind); |
cc7ec456 | 1043 | if (a_o == NULL) |
1da177e4 | 1044 | return 0; |
1da177e4 LT |
1045 | |
1046 | memset(&a, 0, sizeof(struct tc_action)); | |
1047 | a.ops = a_o; | |
1048 | ||
15e47304 | 1049 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
8b00a53c DM |
1050 | cb->nlh->nlmsg_type, sizeof(*t), 0); |
1051 | if (!nlh) | |
1052 | goto out_module_put; | |
1053 | t = nlmsg_data(nlh); | |
1da177e4 | 1054 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1055 | t->tca__pad1 = 0; |
1056 | t->tca__pad2 = 0; | |
1da177e4 | 1057 | |
4b3550ef PM |
1058 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
1059 | if (nest == NULL) | |
8b00a53c | 1060 | goto out_module_put; |
1da177e4 LT |
1061 | |
1062 | ret = a_o->walk(skb, cb, RTM_GETACTION, &a); | |
1063 | if (ret < 0) | |
8b00a53c | 1064 | goto out_module_put; |
1da177e4 LT |
1065 | |
1066 | if (ret > 0) { | |
4b3550ef | 1067 | nla_nest_end(skb, nest); |
1da177e4 LT |
1068 | ret = skb->len; |
1069 | } else | |
4b3550ef | 1070 | nla_nest_cancel(skb, nest); |
1da177e4 | 1071 | |
27a884dc | 1072 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
15e47304 | 1073 | if (NETLINK_CB(cb->skb).portid && ret) |
1da177e4 LT |
1074 | nlh->nlmsg_flags |= NLM_F_MULTI; |
1075 | module_put(a_o->owner); | |
1076 | return skb->len; | |
1077 | ||
8b00a53c | 1078 | out_module_put: |
1da177e4 | 1079 | module_put(a_o->owner); |
dc5fc579 | 1080 | nlmsg_trim(skb, b); |
1da177e4 LT |
1081 | return skb->len; |
1082 | } | |
1083 | ||
1084 | static int __init tc_action_init(void) | |
1085 | { | |
c7ac8679 GR |
1086 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL); |
1087 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL); | |
1088 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, | |
1089 | NULL); | |
1da177e4 | 1090 | |
1da177e4 LT |
1091 | return 0; |
1092 | } | |
1093 | ||
1094 | subsys_initcall(tc_action_init); |