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 | |
519c818e ED |
30 | static void free_tcf(struct rcu_head *head) |
31 | { | |
32 | struct tcf_common *p = container_of(head, struct tcf_common, tcfc_rcu); | |
33 | ||
34 | free_percpu(p->cpu_bstats); | |
35 | free_percpu(p->cpu_qstats); | |
36 | kfree(p); | |
37 | } | |
38 | ||
3c645621 | 39 | static void tcf_hash_destroy(struct tc_action *a) |
e9ce1cd3 | 40 | { |
86062033 WC |
41 | struct tcf_common *p = a->priv; |
42 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
43 | ||
89819dc0 WC |
44 | spin_lock_bh(&hinfo->lock); |
45 | hlist_del(&p->tcfc_head); | |
46 | spin_unlock_bh(&hinfo->lock); | |
47 | gen_kill_estimator(&p->tcfc_bstats, | |
48 | &p->tcfc_rate_est); | |
49 | /* | |
50 | * gen_estimator est_timer() might access p->tcfc_lock | |
51 | * or bstats, wait a RCU grace period before freeing p | |
52 | */ | |
519c818e | 53 | call_rcu(&p->tcfc_rcu, free_tcf); |
e9ce1cd3 | 54 | } |
e9ce1cd3 | 55 | |
28e6b67f | 56 | int __tcf_hash_release(struct tc_action *a, bool bind, bool strict) |
e9ce1cd3 | 57 | { |
86062033 | 58 | struct tcf_common *p = a->priv; |
e9ce1cd3 DM |
59 | int ret = 0; |
60 | ||
61 | if (p) { | |
62 | if (bind) | |
63 | p->tcfc_bindcnt--; | |
28e6b67f | 64 | else if (strict && p->tcfc_bindcnt > 0) |
55334a5d | 65 | return -EPERM; |
e9ce1cd3 DM |
66 | |
67 | p->tcfc_refcnt--; | |
10297b99 | 68 | if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) { |
a5b5c958 WC |
69 | if (a->ops->cleanup) |
70 | a->ops->cleanup(a, bind); | |
86062033 | 71 | tcf_hash_destroy(a); |
e9ce1cd3 DM |
72 | ret = 1; |
73 | } | |
74 | } | |
28e6b67f | 75 | |
e9ce1cd3 DM |
76 | return ret; |
77 | } | |
28e6b67f | 78 | EXPORT_SYMBOL(__tcf_hash_release); |
e9ce1cd3 DM |
79 | |
80 | static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
c779f7af | 81 | struct tc_action *a) |
e9ce1cd3 | 82 | { |
c779f7af | 83 | struct tcf_hashinfo *hinfo = a->ops->hinfo; |
89819dc0 | 84 | struct hlist_head *head; |
e9ce1cd3 | 85 | struct tcf_common *p; |
cc7ec456 | 86 | int err = 0, index = -1, i = 0, s_i = 0, n_i = 0; |
4b3550ef | 87 | struct nlattr *nest; |
e9ce1cd3 | 88 | |
89819dc0 | 89 | spin_lock_bh(&hinfo->lock); |
e9ce1cd3 DM |
90 | |
91 | s_i = cb->args[0]; | |
92 | ||
93 | for (i = 0; i < (hinfo->hmask + 1); i++) { | |
89819dc0 | 94 | head = &hinfo->htab[tcf_hash(i, hinfo->hmask)]; |
e9ce1cd3 | 95 | |
89819dc0 | 96 | hlist_for_each_entry_rcu(p, head, tcfc_head) { |
e9ce1cd3 DM |
97 | index++; |
98 | if (index < s_i) | |
99 | continue; | |
100 | a->priv = p; | |
101 | a->order = n_i; | |
4b3550ef PM |
102 | |
103 | nest = nla_nest_start(skb, a->order); | |
104 | if (nest == NULL) | |
105 | goto nla_put_failure; | |
e9ce1cd3 DM |
106 | err = tcf_action_dump_1(skb, a, 0, 0); |
107 | if (err < 0) { | |
108 | index--; | |
4b3550ef | 109 | nlmsg_trim(skb, nest); |
e9ce1cd3 DM |
110 | goto done; |
111 | } | |
4b3550ef | 112 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
113 | n_i++; |
114 | if (n_i >= TCA_ACT_MAX_PRIO) | |
115 | goto done; | |
116 | } | |
117 | } | |
118 | done: | |
89819dc0 | 119 | spin_unlock_bh(&hinfo->lock); |
e9ce1cd3 DM |
120 | if (n_i) |
121 | cb->args[0] += n_i; | |
122 | return n_i; | |
123 | ||
7ba699c6 | 124 | nla_put_failure: |
4b3550ef | 125 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
126 | goto done; |
127 | } | |
128 | ||
c779f7af | 129 | static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a) |
e9ce1cd3 | 130 | { |
c779f7af | 131 | struct tcf_hashinfo *hinfo = a->ops->hinfo; |
89819dc0 WC |
132 | struct hlist_head *head; |
133 | struct hlist_node *n; | |
134 | struct tcf_common *p; | |
4b3550ef | 135 | struct nlattr *nest; |
cc7ec456 | 136 | int i = 0, n_i = 0; |
55334a5d | 137 | int ret = -EINVAL; |
e9ce1cd3 | 138 | |
4b3550ef PM |
139 | nest = nla_nest_start(skb, a->order); |
140 | if (nest == NULL) | |
141 | goto nla_put_failure; | |
1b34ec43 DM |
142 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) |
143 | goto nla_put_failure; | |
e9ce1cd3 | 144 | for (i = 0; i < (hinfo->hmask + 1); i++) { |
89819dc0 WC |
145 | head = &hinfo->htab[tcf_hash(i, hinfo->hmask)]; |
146 | hlist_for_each_entry_safe(p, n, head, tcfc_head) { | |
86062033 | 147 | a->priv = p; |
28e6b67f | 148 | ret = __tcf_hash_release(a, false, true); |
55334a5d | 149 | if (ret == ACT_P_DELETED) { |
cc7ec456 | 150 | module_put(a->ops->owner); |
805c1f4a | 151 | n_i++; |
55334a5d WC |
152 | } else if (ret < 0) |
153 | goto nla_put_failure; | |
e9ce1cd3 DM |
154 | } |
155 | } | |
1b34ec43 DM |
156 | if (nla_put_u32(skb, TCA_FCNT, n_i)) |
157 | goto nla_put_failure; | |
4b3550ef | 158 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
159 | |
160 | return n_i; | |
7ba699c6 | 161 | nla_put_failure: |
4b3550ef | 162 | nla_nest_cancel(skb, nest); |
55334a5d | 163 | return ret; |
e9ce1cd3 DM |
164 | } |
165 | ||
9c75f402 | 166 | static int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb, |
167 | int type, struct tc_action *a) | |
e9ce1cd3 | 168 | { |
e9ce1cd3 | 169 | if (type == RTM_DELACTION) { |
c779f7af | 170 | return tcf_del_walker(skb, a); |
e9ce1cd3 | 171 | } else if (type == RTM_GETACTION) { |
c779f7af | 172 | return tcf_dump_walker(skb, cb, a); |
e9ce1cd3 | 173 | } else { |
6ff9c364 | 174 | WARN(1, "tcf_generic_walker: unknown action %d\n", type); |
e9ce1cd3 DM |
175 | return -EINVAL; |
176 | } | |
177 | } | |
e9ce1cd3 | 178 | |
6e6a50c2 | 179 | static struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo) |
e9ce1cd3 | 180 | { |
89819dc0 WC |
181 | struct tcf_common *p = NULL; |
182 | struct hlist_head *head; | |
e9ce1cd3 | 183 | |
89819dc0 WC |
184 | spin_lock_bh(&hinfo->lock); |
185 | head = &hinfo->htab[tcf_hash(index, hinfo->hmask)]; | |
186 | hlist_for_each_entry_rcu(p, head, tcfc_head) | |
e9ce1cd3 DM |
187 | if (p->tcfc_index == index) |
188 | break; | |
89819dc0 | 189 | spin_unlock_bh(&hinfo->lock); |
e9ce1cd3 DM |
190 | |
191 | return p; | |
192 | } | |
e9ce1cd3 | 193 | |
ddafd34f | 194 | u32 tcf_hash_new_index(struct tcf_hashinfo *hinfo) |
e9ce1cd3 | 195 | { |
ddafd34f | 196 | u32 val = hinfo->index; |
e9ce1cd3 DM |
197 | |
198 | do { | |
199 | if (++val == 0) | |
200 | val = 1; | |
201 | } while (tcf_hash_lookup(val, hinfo)); | |
202 | ||
ddafd34f | 203 | hinfo->index = val; |
17569fae | 204 | return val; |
e9ce1cd3 DM |
205 | } |
206 | EXPORT_SYMBOL(tcf_hash_new_index); | |
207 | ||
6e6a50c2 | 208 | int tcf_hash_search(struct tc_action *a, u32 index) |
e9ce1cd3 DM |
209 | { |
210 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
211 | struct tcf_common *p = tcf_hash_lookup(index, hinfo); | |
212 | ||
213 | if (p) { | |
214 | a->priv = p; | |
215 | return 1; | |
216 | } | |
217 | return 0; | |
218 | } | |
6e6a50c2 | 219 | EXPORT_SYMBOL(tcf_hash_search); |
e9ce1cd3 | 220 | |
86062033 | 221 | int tcf_hash_check(u32 index, struct tc_action *a, int bind) |
e9ce1cd3 | 222 | { |
c779f7af | 223 | struct tcf_hashinfo *hinfo = a->ops->hinfo; |
e9ce1cd3 DM |
224 | struct tcf_common *p = NULL; |
225 | if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) { | |
76aab2c1 | 226 | if (bind) |
e9ce1cd3 | 227 | p->tcfc_bindcnt++; |
76aab2c1 | 228 | p->tcfc_refcnt++; |
e9ce1cd3 | 229 | a->priv = p; |
86062033 | 230 | return 1; |
e9ce1cd3 | 231 | } |
86062033 | 232 | return 0; |
e9ce1cd3 DM |
233 | } |
234 | EXPORT_SYMBOL(tcf_hash_check); | |
235 | ||
86062033 WC |
236 | void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est) |
237 | { | |
238 | struct tcf_common *pc = a->priv; | |
239 | if (est) | |
240 | gen_kill_estimator(&pc->tcfc_bstats, | |
241 | &pc->tcfc_rate_est); | |
519c818e | 242 | call_rcu(&pc->tcfc_rcu, free_tcf); |
86062033 WC |
243 | } |
244 | EXPORT_SYMBOL(tcf_hash_cleanup); | |
245 | ||
246 | int tcf_hash_create(u32 index, struct nlattr *est, struct tc_action *a, | |
519c818e | 247 | int size, int bind, bool cpustats) |
e9ce1cd3 | 248 | { |
c779f7af | 249 | struct tcf_hashinfo *hinfo = a->ops->hinfo; |
e9ce1cd3 | 250 | struct tcf_common *p = kzalloc(size, GFP_KERNEL); |
519c818e | 251 | int err = -ENOMEM; |
e9ce1cd3 DM |
252 | |
253 | if (unlikely(!p)) | |
86062033 | 254 | return -ENOMEM; |
e9ce1cd3 DM |
255 | p->tcfc_refcnt = 1; |
256 | if (bind) | |
257 | p->tcfc_bindcnt = 1; | |
258 | ||
519c818e ED |
259 | if (cpustats) { |
260 | p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); | |
261 | if (!p->cpu_bstats) { | |
262 | err1: | |
263 | kfree(p); | |
264 | return err; | |
265 | } | |
266 | p->cpu_qstats = alloc_percpu(struct gnet_stats_queue); | |
267 | if (!p->cpu_qstats) { | |
268 | err2: | |
269 | free_percpu(p->cpu_bstats); | |
270 | goto err1; | |
271 | } | |
272 | } | |
e9ce1cd3 | 273 | spin_lock_init(&p->tcfc_lock); |
89819dc0 | 274 | INIT_HLIST_NODE(&p->tcfc_head); |
ddafd34f | 275 | p->tcfc_index = index ? index : tcf_hash_new_index(hinfo); |
e9ce1cd3 DM |
276 | p->tcfc_tm.install = jiffies; |
277 | p->tcfc_tm.lastuse = jiffies; | |
0e991ec6 | 278 | if (est) { |
519c818e ED |
279 | err = gen_new_estimator(&p->tcfc_bstats, p->cpu_bstats, |
280 | &p->tcfc_rate_est, | |
281 | &p->tcfc_lock, est); | |
0e991ec6 | 282 | if (err) { |
519c818e ED |
283 | free_percpu(p->cpu_qstats); |
284 | goto err2; | |
0e991ec6 SH |
285 | } |
286 | } | |
287 | ||
e9ce1cd3 | 288 | a->priv = (void *) p; |
86062033 | 289 | return 0; |
e9ce1cd3 DM |
290 | } |
291 | EXPORT_SYMBOL(tcf_hash_create); | |
292 | ||
86062033 | 293 | void tcf_hash_insert(struct tc_action *a) |
e9ce1cd3 | 294 | { |
86062033 WC |
295 | struct tcf_common *p = a->priv; |
296 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
e9ce1cd3 DM |
297 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); |
298 | ||
89819dc0 WC |
299 | spin_lock_bh(&hinfo->lock); |
300 | hlist_add_head(&p->tcfc_head, &hinfo->htab[h]); | |
301 | spin_unlock_bh(&hinfo->lock); | |
e9ce1cd3 DM |
302 | } |
303 | EXPORT_SYMBOL(tcf_hash_insert); | |
1da177e4 | 304 | |
1f747c26 | 305 | static LIST_HEAD(act_base); |
1da177e4 LT |
306 | static DEFINE_RWLOCK(act_mod_lock); |
307 | ||
4f1e9d89 | 308 | int tcf_register_action(struct tc_action_ops *act, unsigned int mask) |
1da177e4 | 309 | { |
1f747c26 | 310 | struct tc_action_ops *a; |
4f1e9d89 | 311 | int err; |
1da177e4 | 312 | |
a5b5c958 WC |
313 | /* Must supply act, dump and init */ |
314 | if (!act->act || !act->dump || !act->init) | |
76c82d7a JHS |
315 | return -EINVAL; |
316 | ||
382ca8a1 | 317 | /* Supply defaults */ |
63ef6174 JHS |
318 | if (!act->lookup) |
319 | act->lookup = tcf_hash_search; | |
382ca8a1 JHS |
320 | if (!act->walk) |
321 | act->walk = tcf_generic_walker; | |
63ef6174 | 322 | |
4f1e9d89 WC |
323 | act->hinfo = kmalloc(sizeof(struct tcf_hashinfo), GFP_KERNEL); |
324 | if (!act->hinfo) | |
325 | return -ENOMEM; | |
326 | err = tcf_hashinfo_init(act->hinfo, mask); | |
327 | if (err) { | |
328 | kfree(act->hinfo); | |
329 | return err; | |
330 | } | |
331 | ||
1da177e4 | 332 | write_lock(&act_mod_lock); |
1f747c26 | 333 | list_for_each_entry(a, &act_base, head) { |
1da177e4 LT |
334 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { |
335 | write_unlock(&act_mod_lock); | |
4f1e9d89 WC |
336 | tcf_hashinfo_destroy(act->hinfo); |
337 | kfree(act->hinfo); | |
1da177e4 LT |
338 | return -EEXIST; |
339 | } | |
340 | } | |
1f747c26 | 341 | list_add_tail(&act->head, &act_base); |
1da177e4 LT |
342 | write_unlock(&act_mod_lock); |
343 | return 0; | |
344 | } | |
62e3ba1b | 345 | EXPORT_SYMBOL(tcf_register_action); |
1da177e4 LT |
346 | |
347 | int tcf_unregister_action(struct tc_action_ops *act) | |
348 | { | |
1f747c26 | 349 | struct tc_action_ops *a; |
1da177e4 LT |
350 | int err = -ENOENT; |
351 | ||
352 | write_lock(&act_mod_lock); | |
a792866a ED |
353 | list_for_each_entry(a, &act_base, head) { |
354 | if (a == act) { | |
355 | list_del(&act->head); | |
4f1e9d89 WC |
356 | tcf_hashinfo_destroy(act->hinfo); |
357 | kfree(act->hinfo); | |
a792866a | 358 | err = 0; |
1da177e4 | 359 | break; |
a792866a | 360 | } |
1da177e4 LT |
361 | } |
362 | write_unlock(&act_mod_lock); | |
363 | return err; | |
364 | } | |
62e3ba1b | 365 | EXPORT_SYMBOL(tcf_unregister_action); |
1da177e4 LT |
366 | |
367 | /* lookup by name */ | |
368 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
369 | { | |
a792866a | 370 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
371 | |
372 | if (kind) { | |
373 | read_lock(&act_mod_lock); | |
1f747c26 | 374 | list_for_each_entry(a, &act_base, head) { |
1da177e4 | 375 | if (strcmp(kind, a->kind) == 0) { |
a792866a ED |
376 | if (try_module_get(a->owner)) |
377 | res = a; | |
1da177e4 LT |
378 | break; |
379 | } | |
380 | } | |
381 | read_unlock(&act_mod_lock); | |
382 | } | |
a792866a | 383 | return res; |
1da177e4 LT |
384 | } |
385 | ||
7ba699c6 PM |
386 | /* lookup by nlattr */ |
387 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) | |
1da177e4 | 388 | { |
a792866a | 389 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
390 | |
391 | if (kind) { | |
392 | read_lock(&act_mod_lock); | |
1f747c26 | 393 | list_for_each_entry(a, &act_base, head) { |
7ba699c6 | 394 | if (nla_strcmp(kind, a->kind) == 0) { |
a792866a ED |
395 | if (try_module_get(a->owner)) |
396 | res = a; | |
1da177e4 LT |
397 | break; |
398 | } | |
399 | } | |
400 | read_unlock(&act_mod_lock); | |
401 | } | |
a792866a | 402 | return res; |
1da177e4 | 403 | } |
1da177e4 | 404 | |
33be6271 | 405 | int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions, |
10297b99 | 406 | struct tcf_result *res) |
1da177e4 | 407 | { |
dc7f9f6e | 408 | const struct tc_action *a; |
1da177e4 LT |
409 | int ret = -1; |
410 | ||
411 | if (skb->tc_verd & TC_NCLS) { | |
412 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
1da177e4 LT |
413 | ret = TC_ACT_OK; |
414 | goto exec_done; | |
415 | } | |
33be6271 | 416 | list_for_each_entry(a, actions, list) { |
1da177e4 | 417 | repeat: |
63acd680 | 418 | ret = a->ops->act(skb, a, res); |
63acd680 JHS |
419 | if (ret == TC_ACT_REPEAT) |
420 | goto repeat; /* we need a ttl - JHS */ | |
421 | if (ret != TC_ACT_PIPE) | |
422 | goto exec_done; | |
1da177e4 LT |
423 | } |
424 | exec_done: | |
1da177e4 LT |
425 | return ret; |
426 | } | |
62e3ba1b | 427 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 | 428 | |
55334a5d | 429 | int tcf_action_destroy(struct list_head *actions, int bind) |
1da177e4 | 430 | { |
33be6271 | 431 | struct tc_action *a, *tmp; |
55334a5d | 432 | int ret = 0; |
1da177e4 | 433 | |
33be6271 | 434 | list_for_each_entry_safe(a, tmp, actions, list) { |
28e6b67f | 435 | ret = __tcf_hash_release(a, bind, true); |
55334a5d | 436 | if (ret == ACT_P_DELETED) |
63acd680 | 437 | module_put(a->ops->owner); |
55334a5d WC |
438 | else if (ret < 0) |
439 | return ret; | |
63acd680 JHS |
440 | list_del(&a->list); |
441 | kfree(a); | |
1da177e4 | 442 | } |
55334a5d | 443 | return ret; |
1da177e4 LT |
444 | } |
445 | ||
446 | int | |
447 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
448 | { | |
1da177e4 LT |
449 | return a->ops->dump(skb, a, bind, ref); |
450 | } | |
451 | ||
452 | int | |
453 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
454 | { | |
455 | int err = -EINVAL; | |
27a884dc | 456 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 457 | struct nlattr *nest; |
1da177e4 | 458 | |
1b34ec43 DM |
459 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) |
460 | goto nla_put_failure; | |
1da177e4 | 461 | if (tcf_action_copy_stats(skb, a, 0)) |
7ba699c6 | 462 | goto nla_put_failure; |
4b3550ef PM |
463 | nest = nla_nest_start(skb, TCA_OPTIONS); |
464 | if (nest == NULL) | |
465 | goto nla_put_failure; | |
cc7ec456 ED |
466 | err = tcf_action_dump_old(skb, a, bind, ref); |
467 | if (err > 0) { | |
4b3550ef | 468 | nla_nest_end(skb, nest); |
1da177e4 LT |
469 | return err; |
470 | } | |
471 | ||
7ba699c6 | 472 | nla_put_failure: |
dc5fc579 | 473 | nlmsg_trim(skb, b); |
1da177e4 LT |
474 | return -1; |
475 | } | |
62e3ba1b | 476 | EXPORT_SYMBOL(tcf_action_dump_1); |
1da177e4 LT |
477 | |
478 | int | |
33be6271 | 479 | tcf_action_dump(struct sk_buff *skb, struct list_head *actions, int bind, int ref) |
1da177e4 LT |
480 | { |
481 | struct tc_action *a; | |
482 | int err = -EINVAL; | |
4b3550ef | 483 | struct nlattr *nest; |
1da177e4 | 484 | |
33be6271 | 485 | list_for_each_entry(a, actions, list) { |
4b3550ef PM |
486 | nest = nla_nest_start(skb, a->order); |
487 | if (nest == NULL) | |
488 | goto nla_put_failure; | |
1da177e4 LT |
489 | err = tcf_action_dump_1(skb, a, bind, ref); |
490 | if (err < 0) | |
4fe683f5 | 491 | goto errout; |
4b3550ef | 492 | nla_nest_end(skb, nest); |
1da177e4 LT |
493 | } |
494 | ||
495 | return 0; | |
496 | ||
7ba699c6 | 497 | nla_put_failure: |
4fe683f5 TG |
498 | err = -EINVAL; |
499 | errout: | |
4b3550ef | 500 | nla_nest_cancel(skb, nest); |
4fe683f5 | 501 | return err; |
1da177e4 LT |
502 | } |
503 | ||
c1b52739 BL |
504 | struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla, |
505 | struct nlattr *est, char *name, int ovr, | |
506 | int bind) | |
1da177e4 LT |
507 | { |
508 | struct tc_action *a; | |
509 | struct tc_action_ops *a_o; | |
510 | char act_name[IFNAMSIZ]; | |
cc7ec456 | 511 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 512 | struct nlattr *kind; |
ab27cfb8 | 513 | int err; |
1da177e4 | 514 | |
1da177e4 | 515 | if (name == NULL) { |
cee63723 PM |
516 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
517 | if (err < 0) | |
1da177e4 | 518 | goto err_out; |
cee63723 | 519 | err = -EINVAL; |
7ba699c6 | 520 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
521 | if (kind == NULL) |
522 | goto err_out; | |
7ba699c6 | 523 | if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) |
1da177e4 LT |
524 | goto err_out; |
525 | } else { | |
cee63723 | 526 | err = -EINVAL; |
1da177e4 LT |
527 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) |
528 | goto err_out; | |
529 | } | |
530 | ||
531 | a_o = tc_lookup_action_n(act_name); | |
532 | if (a_o == NULL) { | |
95a5afca | 533 | #ifdef CONFIG_MODULES |
1da177e4 | 534 | rtnl_unlock(); |
4bba3925 | 535 | request_module("act_%s", act_name); |
1da177e4 LT |
536 | rtnl_lock(); |
537 | ||
538 | a_o = tc_lookup_action_n(act_name); | |
539 | ||
540 | /* We dropped the RTNL semaphore in order to | |
541 | * perform the module load. So, even if we | |
542 | * succeeded in loading the module we have to | |
543 | * tell the caller to replay the request. We | |
544 | * indicate this using -EAGAIN. | |
545 | */ | |
546 | if (a_o != NULL) { | |
ab27cfb8 | 547 | err = -EAGAIN; |
1da177e4 LT |
548 | goto err_mod; |
549 | } | |
550 | #endif | |
ab27cfb8 | 551 | err = -ENOENT; |
1da177e4 LT |
552 | goto err_out; |
553 | } | |
554 | ||
ab27cfb8 | 555 | err = -ENOMEM; |
0da974f4 | 556 | a = kzalloc(sizeof(*a), GFP_KERNEL); |
1da177e4 LT |
557 | if (a == NULL) |
558 | goto err_mod; | |
1da177e4 | 559 | |
c779f7af | 560 | a->ops = a_o; |
33be6271 | 561 | INIT_LIST_HEAD(&a->list); |
1da177e4 LT |
562 | /* backward compatibility for policer */ |
563 | if (name == NULL) | |
c1b52739 | 564 | err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, a, ovr, bind); |
1da177e4 | 565 | else |
c1b52739 | 566 | err = a_o->init(net, nla, est, a, ovr, bind); |
ab27cfb8 | 567 | if (err < 0) |
1da177e4 LT |
568 | goto err_free; |
569 | ||
570 | /* module count goes up only when brand new policy is created | |
cc7ec456 ED |
571 | * if it exists and is only bound to in a_o->init() then |
572 | * ACT_P_CREATED is not returned (a zero is). | |
573 | */ | |
ab27cfb8 | 574 | if (err != ACT_P_CREATED) |
1da177e4 | 575 | module_put(a_o->owner); |
1da177e4 | 576 | |
1da177e4 LT |
577 | return a; |
578 | ||
579 | err_free: | |
580 | kfree(a); | |
581 | err_mod: | |
582 | module_put(a_o->owner); | |
583 | err_out: | |
ab27cfb8 | 584 | return ERR_PTR(err); |
1da177e4 LT |
585 | } |
586 | ||
33be6271 | 587 | int tcf_action_init(struct net *net, struct nlattr *nla, |
c1b52739 | 588 | struct nlattr *est, char *name, int ovr, |
33be6271 | 589 | int bind, struct list_head *actions) |
1da177e4 | 590 | { |
cc7ec456 | 591 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 | 592 | struct tc_action *act; |
cee63723 | 593 | int err; |
1da177e4 LT |
594 | int i; |
595 | ||
cee63723 PM |
596 | err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
597 | if (err < 0) | |
33be6271 | 598 | return err; |
1da177e4 | 599 | |
7ba699c6 | 600 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
c1b52739 | 601 | act = tcf_action_init_1(net, tb[i], est, name, ovr, bind); |
33be6271 WC |
602 | if (IS_ERR(act)) { |
603 | err = PTR_ERR(act); | |
1da177e4 | 604 | goto err; |
33be6271 | 605 | } |
7ba699c6 | 606 | act->order = i; |
33be6271 | 607 | list_add_tail(&act->list, actions); |
1da177e4 | 608 | } |
33be6271 | 609 | return 0; |
1da177e4 LT |
610 | |
611 | err: | |
33be6271 WC |
612 | tcf_action_destroy(actions, bind); |
613 | return err; | |
1da177e4 LT |
614 | } |
615 | ||
616 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a, | |
617 | int compat_mode) | |
618 | { | |
619 | int err = 0; | |
620 | struct gnet_dump d; | |
7eb8896d | 621 | struct tcf_common *p = a->priv; |
10297b99 | 622 | |
7eb8896d | 623 | if (p == NULL) |
1da177e4 LT |
624 | goto errout; |
625 | ||
626 | /* compat_mode being true specifies a call that is supposed | |
06fe9fb4 | 627 | * to add additional backward compatibility statistic TLVs. |
1da177e4 LT |
628 | */ |
629 | if (compat_mode) { | |
630 | if (a->type == TCA_OLD_COMPAT) | |
631 | err = gnet_stats_start_copy_compat(skb, 0, | |
7eb8896d | 632 | TCA_STATS, TCA_XSTATS, &p->tcfc_lock, &d); |
1da177e4 LT |
633 | else |
634 | return 0; | |
635 | } else | |
636 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
7eb8896d | 637 | &p->tcfc_lock, &d); |
1da177e4 LT |
638 | |
639 | if (err < 0) | |
640 | goto errout; | |
641 | ||
519c818e | 642 | if (gnet_stats_copy_basic(&d, p->cpu_bstats, &p->tcfc_bstats) < 0 || |
7eb8896d WC |
643 | gnet_stats_copy_rate_est(&d, &p->tcfc_bstats, |
644 | &p->tcfc_rate_est) < 0 || | |
519c818e | 645 | gnet_stats_copy_queue(&d, p->cpu_qstats, |
64015853 JF |
646 | &p->tcfc_qstats, |
647 | p->tcfc_qstats.qlen) < 0) | |
1da177e4 LT |
648 | goto errout; |
649 | ||
650 | if (gnet_stats_finish_copy(&d) < 0) | |
651 | goto errout; | |
652 | ||
653 | return 0; | |
654 | ||
655 | errout: | |
656 | return -1; | |
657 | } | |
658 | ||
659 | static int | |
33be6271 | 660 | tca_get_fill(struct sk_buff *skb, struct list_head *actions, u32 portid, u32 seq, |
10297b99 | 661 | u16 flags, int event, int bind, int ref) |
1da177e4 LT |
662 | { |
663 | struct tcamsg *t; | |
664 | struct nlmsghdr *nlh; | |
27a884dc | 665 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 666 | struct nlattr *nest; |
1da177e4 | 667 | |
15e47304 | 668 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags); |
8b00a53c DM |
669 | if (!nlh) |
670 | goto out_nlmsg_trim; | |
671 | t = nlmsg_data(nlh); | |
1da177e4 | 672 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
673 | t->tca__pad1 = 0; |
674 | t->tca__pad2 = 0; | |
10297b99 | 675 | |
4b3550ef PM |
676 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
677 | if (nest == NULL) | |
8b00a53c | 678 | goto out_nlmsg_trim; |
1da177e4 | 679 | |
33be6271 | 680 | if (tcf_action_dump(skb, actions, bind, ref) < 0) |
8b00a53c | 681 | goto out_nlmsg_trim; |
1da177e4 | 682 | |
4b3550ef | 683 | nla_nest_end(skb, nest); |
10297b99 | 684 | |
27a884dc | 685 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
686 | return skb->len; |
687 | ||
8b00a53c | 688 | out_nlmsg_trim: |
dc5fc579 | 689 | nlmsg_trim(skb, b); |
1da177e4 LT |
690 | return -1; |
691 | } | |
692 | ||
693 | static int | |
15e47304 | 694 | act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n, |
33be6271 | 695 | struct list_head *actions, int event) |
1da177e4 LT |
696 | { |
697 | struct sk_buff *skb; | |
1da177e4 LT |
698 | |
699 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
700 | if (!skb) | |
701 | return -ENOBUFS; | |
33be6271 | 702 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { |
1da177e4 LT |
703 | kfree_skb(skb); |
704 | return -EINVAL; | |
705 | } | |
2942e900 | 706 | |
15e47304 | 707 | return rtnl_unicast(skb, net, portid); |
1da177e4 LT |
708 | } |
709 | ||
03701d6e WC |
710 | static struct tc_action *create_a(int i) |
711 | { | |
712 | struct tc_action *act; | |
713 | ||
714 | act = kzalloc(sizeof(*act), GFP_KERNEL); | |
715 | if (act == NULL) { | |
716 | pr_debug("create_a: failed to alloc!\n"); | |
717 | return NULL; | |
718 | } | |
719 | act->order = i; | |
720 | INIT_LIST_HEAD(&act->list); | |
721 | return act; | |
722 | } | |
723 | ||
1da177e4 | 724 | static struct tc_action * |
15e47304 | 725 | tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 portid) |
1da177e4 | 726 | { |
cc7ec456 | 727 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
1da177e4 LT |
728 | struct tc_action *a; |
729 | int index; | |
ab27cfb8 | 730 | int err; |
1da177e4 | 731 | |
cee63723 PM |
732 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
733 | if (err < 0) | |
ab27cfb8 | 734 | goto err_out; |
1da177e4 | 735 | |
cee63723 | 736 | err = -EINVAL; |
7ba699c6 PM |
737 | if (tb[TCA_ACT_INDEX] == NULL || |
738 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) | |
ab27cfb8 | 739 | goto err_out; |
1587bac4 | 740 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 741 | |
ab27cfb8 | 742 | err = -ENOMEM; |
03701d6e | 743 | a = create_a(0); |
1da177e4 | 744 | if (a == NULL) |
ab27cfb8 | 745 | goto err_out; |
1da177e4 | 746 | |
ab27cfb8 | 747 | err = -EINVAL; |
7ba699c6 | 748 | a->ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
63acd680 | 749 | if (a->ops == NULL) /* could happen in batch of actions */ |
1da177e4 | 750 | goto err_free; |
ab27cfb8 | 751 | err = -ENOENT; |
1da177e4 LT |
752 | if (a->ops->lookup(a, index) == 0) |
753 | goto err_mod; | |
754 | ||
755 | module_put(a->ops->owner); | |
1da177e4 | 756 | return a; |
ab27cfb8 | 757 | |
1da177e4 LT |
758 | err_mod: |
759 | module_put(a->ops->owner); | |
760 | err_free: | |
761 | kfree(a); | |
ab27cfb8 PM |
762 | err_out: |
763 | return ERR_PTR(err); | |
1da177e4 LT |
764 | } |
765 | ||
33be6271 | 766 | static void cleanup_a(struct list_head *actions) |
1da177e4 | 767 | { |
33be6271 | 768 | struct tc_action *a, *tmp; |
1da177e4 | 769 | |
33be6271 WC |
770 | list_for_each_entry_safe(a, tmp, actions, list) { |
771 | list_del(&a->list); | |
1da177e4 LT |
772 | kfree(a); |
773 | } | |
774 | } | |
775 | ||
7316ae88 | 776 | static int tca_action_flush(struct net *net, struct nlattr *nla, |
15e47304 | 777 | struct nlmsghdr *n, u32 portid) |
1da177e4 LT |
778 | { |
779 | struct sk_buff *skb; | |
780 | unsigned char *b; | |
781 | struct nlmsghdr *nlh; | |
782 | struct tcamsg *t; | |
783 | struct netlink_callback dcb; | |
4b3550ef | 784 | struct nlattr *nest; |
cc7ec456 | 785 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 786 | struct nlattr *kind; |
03701d6e | 787 | struct tc_action a; |
36723873 | 788 | int err = -ENOMEM; |
1da177e4 | 789 | |
1da177e4 LT |
790 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
791 | if (!skb) { | |
6ff9c364 | 792 | pr_debug("tca_action_flush: failed skb alloc\n"); |
36723873 | 793 | return err; |
1da177e4 LT |
794 | } |
795 | ||
27a884dc | 796 | b = skb_tail_pointer(skb); |
1da177e4 | 797 | |
cee63723 PM |
798 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
799 | if (err < 0) | |
1da177e4 LT |
800 | goto err_out; |
801 | ||
cee63723 | 802 | err = -EINVAL; |
7ba699c6 | 803 | kind = tb[TCA_ACT_KIND]; |
03701d6e WC |
804 | memset(&a, 0, sizeof(struct tc_action)); |
805 | INIT_LIST_HEAD(&a.list); | |
806 | a.ops = tc_lookup_action(kind); | |
807 | if (a.ops == NULL) /*some idjot trying to flush unknown action */ | |
1da177e4 LT |
808 | goto err_out; |
809 | ||
15e47304 | 810 | nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t), 0); |
8b00a53c DM |
811 | if (!nlh) |
812 | goto out_module_put; | |
813 | t = nlmsg_data(nlh); | |
1da177e4 | 814 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
815 | t->tca__pad1 = 0; |
816 | t->tca__pad2 = 0; | |
1da177e4 | 817 | |
4b3550ef PM |
818 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
819 | if (nest == NULL) | |
8b00a53c | 820 | goto out_module_put; |
1da177e4 | 821 | |
03701d6e | 822 | err = a.ops->walk(skb, &dcb, RTM_DELACTION, &a); |
1da177e4 | 823 | if (err < 0) |
8b00a53c | 824 | goto out_module_put; |
f97017cd JHS |
825 | if (err == 0) |
826 | goto noflush_out; | |
1da177e4 | 827 | |
4b3550ef | 828 | nla_nest_end(skb, nest); |
1da177e4 | 829 | |
27a884dc | 830 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 | 831 | nlh->nlmsg_flags |= NLM_F_ROOT; |
03701d6e | 832 | module_put(a.ops->owner); |
15e47304 | 833 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 834 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
835 | if (err > 0) |
836 | return 0; | |
837 | ||
838 | return err; | |
839 | ||
8b00a53c | 840 | out_module_put: |
03701d6e | 841 | module_put(a.ops->owner); |
1da177e4 | 842 | err_out: |
f97017cd | 843 | noflush_out: |
1da177e4 | 844 | kfree_skb(skb); |
1da177e4 LT |
845 | return err; |
846 | } | |
847 | ||
a56e1953 WC |
848 | static int |
849 | tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions, | |
850 | u32 portid) | |
851 | { | |
852 | int ret; | |
853 | struct sk_buff *skb; | |
854 | ||
855 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
856 | if (!skb) | |
857 | return -ENOBUFS; | |
858 | ||
859 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION, | |
860 | 0, 1) <= 0) { | |
861 | kfree_skb(skb); | |
862 | return -EINVAL; | |
863 | } | |
864 | ||
865 | /* now do the delete */ | |
55334a5d WC |
866 | ret = tcf_action_destroy(actions, 0); |
867 | if (ret < 0) { | |
868 | kfree_skb(skb); | |
869 | return ret; | |
870 | } | |
a56e1953 WC |
871 | |
872 | ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
873 | n->nlmsg_flags & NLM_F_ECHO); | |
874 | if (ret > 0) | |
875 | return 0; | |
876 | return ret; | |
877 | } | |
878 | ||
1da177e4 | 879 | static int |
7316ae88 | 880 | tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
15e47304 | 881 | u32 portid, int event) |
1da177e4 | 882 | { |
cee63723 | 883 | int i, ret; |
cc7ec456 | 884 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 WC |
885 | struct tc_action *act; |
886 | LIST_HEAD(actions); | |
1da177e4 | 887 | |
cee63723 PM |
888 | ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
889 | if (ret < 0) | |
890 | return ret; | |
1da177e4 | 891 | |
cc7ec456 | 892 | if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) { |
f97017cd | 893 | if (tb[1] != NULL) |
15e47304 | 894 | return tca_action_flush(net, tb[1], n, portid); |
f97017cd JHS |
895 | else |
896 | return -EINVAL; | |
1da177e4 LT |
897 | } |
898 | ||
7ba699c6 | 899 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
15e47304 | 900 | act = tcf_action_get_1(tb[i], n, portid); |
ab27cfb8 PM |
901 | if (IS_ERR(act)) { |
902 | ret = PTR_ERR(act); | |
1da177e4 | 903 | goto err; |
ab27cfb8 | 904 | } |
7ba699c6 | 905 | act->order = i; |
33be6271 | 906 | list_add_tail(&act->list, &actions); |
1da177e4 LT |
907 | } |
908 | ||
909 | if (event == RTM_GETACTION) | |
33be6271 | 910 | ret = act_get_notify(net, portid, n, &actions, event); |
1da177e4 | 911 | else { /* delete */ |
a56e1953 WC |
912 | ret = tcf_del_notify(net, n, &actions, portid); |
913 | if (ret) | |
1da177e4 | 914 | goto err; |
1da177e4 LT |
915 | return ret; |
916 | } | |
917 | err: | |
33be6271 | 918 | cleanup_a(&actions); |
1da177e4 LT |
919 | return ret; |
920 | } | |
921 | ||
a56e1953 WC |
922 | static int |
923 | tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions, | |
924 | u32 portid) | |
1da177e4 | 925 | { |
1da177e4 | 926 | struct sk_buff *skb; |
1da177e4 LT |
927 | int err = 0; |
928 | ||
929 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
930 | if (!skb) | |
931 | return -ENOBUFS; | |
932 | ||
a56e1953 WC |
933 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags, |
934 | RTM_NEWACTION, 0, 0) <= 0) { | |
935 | kfree_skb(skb); | |
936 | return -EINVAL; | |
937 | } | |
10297b99 | 938 | |
a56e1953 WC |
939 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
940 | n->nlmsg_flags & NLM_F_ECHO); | |
1da177e4 LT |
941 | if (err > 0) |
942 | err = 0; | |
943 | return err; | |
1da177e4 LT |
944 | } |
945 | ||
1da177e4 | 946 | static int |
7316ae88 | 947 | tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
15e47304 | 948 | u32 portid, int ovr) |
1da177e4 LT |
949 | { |
950 | int ret = 0; | |
33be6271 | 951 | LIST_HEAD(actions); |
1da177e4 | 952 | |
33be6271 WC |
953 | ret = tcf_action_init(net, nla, NULL, NULL, ovr, 0, &actions); |
954 | if (ret) | |
ab27cfb8 | 955 | goto done; |
1da177e4 LT |
956 | |
957 | /* dump then free all the actions after update; inserted policy | |
958 | * stays intact | |
cc7ec456 | 959 | */ |
a56e1953 | 960 | ret = tcf_add_notify(net, n, &actions, portid); |
33be6271 | 961 | cleanup_a(&actions); |
1da177e4 LT |
962 | done: |
963 | return ret; | |
964 | } | |
965 | ||
661d2967 | 966 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 967 | { |
3b1e0a65 | 968 | struct net *net = sock_net(skb->sk); |
7ba699c6 | 969 | struct nlattr *tca[TCA_ACT_MAX + 1]; |
15e47304 | 970 | u32 portid = skb ? NETLINK_CB(skb).portid : 0; |
1da177e4 LT |
971 | int ret = 0, ovr = 0; |
972 | ||
90f62cf3 | 973 | if ((n->nlmsg_type != RTM_GETACTION) && !netlink_capable(skb, CAP_NET_ADMIN)) |
dfc47ef8 EB |
974 | return -EPERM; |
975 | ||
7ba699c6 PM |
976 | ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL); |
977 | if (ret < 0) | |
978 | return ret; | |
979 | ||
980 | if (tca[TCA_ACT_TAB] == NULL) { | |
6ff9c364 | 981 | pr_notice("tc_ctl_action: received NO action attribs\n"); |
1da177e4 LT |
982 | return -EINVAL; |
983 | } | |
984 | ||
cc7ec456 | 985 | /* n->nlmsg_flags & NLM_F_CREATE */ |
1da177e4 LT |
986 | switch (n->nlmsg_type) { |
987 | case RTM_NEWACTION: | |
988 | /* we are going to assume all other flags | |
25985edc | 989 | * imply create only if it doesn't exist |
1da177e4 LT |
990 | * Note that CREATE | EXCL implies that |
991 | * but since we want avoid ambiguity (eg when flags | |
992 | * is zero) then just set this | |
993 | */ | |
cc7ec456 | 994 | if (n->nlmsg_flags & NLM_F_REPLACE) |
1da177e4 LT |
995 | ovr = 1; |
996 | replay: | |
15e47304 | 997 | ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr); |
1da177e4 LT |
998 | if (ret == -EAGAIN) |
999 | goto replay; | |
1000 | break; | |
1001 | case RTM_DELACTION: | |
7316ae88 | 1002 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
15e47304 | 1003 | portid, RTM_DELACTION); |
1da177e4 LT |
1004 | break; |
1005 | case RTM_GETACTION: | |
7316ae88 | 1006 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
15e47304 | 1007 | portid, RTM_GETACTION); |
1da177e4 LT |
1008 | break; |
1009 | default: | |
1010 | BUG(); | |
1011 | } | |
1012 | ||
1013 | return ret; | |
1014 | } | |
1015 | ||
7ba699c6 | 1016 | static struct nlattr * |
3a6c2b41 | 1017 | find_dump_kind(const struct nlmsghdr *n) |
1da177e4 | 1018 | { |
cc7ec456 | 1019 | struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1]; |
7ba699c6 PM |
1020 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
1021 | struct nlattr *nla[TCAA_MAX + 1]; | |
1022 | struct nlattr *kind; | |
1da177e4 | 1023 | |
c96c9471 | 1024 | if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0) |
1da177e4 | 1025 | return NULL; |
7ba699c6 | 1026 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
1027 | if (tb1 == NULL) |
1028 | return NULL; | |
1029 | ||
7ba699c6 PM |
1030 | if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), |
1031 | NLMSG_ALIGN(nla_len(tb1)), NULL) < 0) | |
1da177e4 | 1032 | return NULL; |
1da177e4 | 1033 | |
6d834e04 PM |
1034 | if (tb[1] == NULL) |
1035 | return NULL; | |
1036 | if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]), | |
1037 | nla_len(tb[1]), NULL) < 0) | |
1da177e4 | 1038 | return NULL; |
7ba699c6 | 1039 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 1040 | |
26dab893 | 1041 | return kind; |
1da177e4 LT |
1042 | } |
1043 | ||
1044 | static int | |
1045 | tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) | |
1046 | { | |
1047 | struct nlmsghdr *nlh; | |
27a884dc | 1048 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1049 | struct nlattr *nest; |
1da177e4 LT |
1050 | struct tc_action_ops *a_o; |
1051 | struct tc_action a; | |
1052 | int ret = 0; | |
8b00a53c | 1053 | struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh); |
7ba699c6 | 1054 | struct nlattr *kind = find_dump_kind(cb->nlh); |
1da177e4 LT |
1055 | |
1056 | if (kind == NULL) { | |
6ff9c364 | 1057 | pr_info("tc_dump_action: action bad kind\n"); |
1da177e4 LT |
1058 | return 0; |
1059 | } | |
1060 | ||
26dab893 | 1061 | a_o = tc_lookup_action(kind); |
cc7ec456 | 1062 | if (a_o == NULL) |
1da177e4 | 1063 | return 0; |
1da177e4 LT |
1064 | |
1065 | memset(&a, 0, sizeof(struct tc_action)); | |
1066 | a.ops = a_o; | |
1067 | ||
15e47304 | 1068 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
8b00a53c DM |
1069 | cb->nlh->nlmsg_type, sizeof(*t), 0); |
1070 | if (!nlh) | |
1071 | goto out_module_put; | |
1072 | t = nlmsg_data(nlh); | |
1da177e4 | 1073 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1074 | t->tca__pad1 = 0; |
1075 | t->tca__pad2 = 0; | |
1da177e4 | 1076 | |
4b3550ef PM |
1077 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
1078 | if (nest == NULL) | |
8b00a53c | 1079 | goto out_module_put; |
1da177e4 LT |
1080 | |
1081 | ret = a_o->walk(skb, cb, RTM_GETACTION, &a); | |
1082 | if (ret < 0) | |
8b00a53c | 1083 | goto out_module_put; |
1da177e4 LT |
1084 | |
1085 | if (ret > 0) { | |
4b3550ef | 1086 | nla_nest_end(skb, nest); |
1da177e4 LT |
1087 | ret = skb->len; |
1088 | } else | |
4b3550ef | 1089 | nla_nest_cancel(skb, nest); |
1da177e4 | 1090 | |
27a884dc | 1091 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
15e47304 | 1092 | if (NETLINK_CB(cb->skb).portid && ret) |
1da177e4 LT |
1093 | nlh->nlmsg_flags |= NLM_F_MULTI; |
1094 | module_put(a_o->owner); | |
1095 | return skb->len; | |
1096 | ||
8b00a53c | 1097 | out_module_put: |
1da177e4 | 1098 | module_put(a_o->owner); |
dc5fc579 | 1099 | nlmsg_trim(skb, b); |
1da177e4 LT |
1100 | return skb->len; |
1101 | } | |
1102 | ||
1103 | static int __init tc_action_init(void) | |
1104 | { | |
c7ac8679 GR |
1105 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL); |
1106 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL); | |
1107 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, | |
1108 | NULL); | |
1da177e4 | 1109 | |
1da177e4 LT |
1110 | return 0; |
1111 | } | |
1112 | ||
1113 | subsys_initcall(tc_action_init); |