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Commit | Line | Data |
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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 | ||
28e6b67f | 48 | int __tcf_hash_release(struct tc_action *a, bool bind, bool strict) |
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--; | |
28e6b67f | 56 | else if (strict && p->tcfc_bindcnt > 0) |
55334a5d | 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 | } | |
28e6b67f | 67 | |
e9ce1cd3 DM |
68 | return ret; |
69 | } | |
28e6b67f | 70 | EXPORT_SYMBOL(__tcf_hash_release); |
e9ce1cd3 DM |
71 | |
72 | static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
c779f7af | 73 | struct tc_action *a) |
e9ce1cd3 | 74 | { |
c779f7af | 75 | struct tcf_hashinfo *hinfo = a->ops->hinfo; |
89819dc0 | 76 | struct hlist_head *head; |
e9ce1cd3 | 77 | struct tcf_common *p; |
cc7ec456 | 78 | int err = 0, index = -1, i = 0, s_i = 0, n_i = 0; |
4b3550ef | 79 | struct nlattr *nest; |
e9ce1cd3 | 80 | |
89819dc0 | 81 | spin_lock_bh(&hinfo->lock); |
e9ce1cd3 DM |
82 | |
83 | s_i = cb->args[0]; | |
84 | ||
85 | for (i = 0; i < (hinfo->hmask + 1); i++) { | |
89819dc0 | 86 | head = &hinfo->htab[tcf_hash(i, hinfo->hmask)]; |
e9ce1cd3 | 87 | |
89819dc0 | 88 | hlist_for_each_entry_rcu(p, head, tcfc_head) { |
e9ce1cd3 DM |
89 | index++; |
90 | if (index < s_i) | |
91 | continue; | |
92 | a->priv = p; | |
93 | a->order = n_i; | |
4b3550ef PM |
94 | |
95 | nest = nla_nest_start(skb, a->order); | |
96 | if (nest == NULL) | |
97 | goto nla_put_failure; | |
e9ce1cd3 DM |
98 | err = tcf_action_dump_1(skb, a, 0, 0); |
99 | if (err < 0) { | |
100 | index--; | |
4b3550ef | 101 | nlmsg_trim(skb, nest); |
e9ce1cd3 DM |
102 | goto done; |
103 | } | |
4b3550ef | 104 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
105 | n_i++; |
106 | if (n_i >= TCA_ACT_MAX_PRIO) | |
107 | goto done; | |
108 | } | |
109 | } | |
110 | done: | |
89819dc0 | 111 | spin_unlock_bh(&hinfo->lock); |
e9ce1cd3 DM |
112 | if (n_i) |
113 | cb->args[0] += n_i; | |
114 | return n_i; | |
115 | ||
7ba699c6 | 116 | nla_put_failure: |
4b3550ef | 117 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
118 | goto done; |
119 | } | |
120 | ||
c779f7af | 121 | static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a) |
e9ce1cd3 | 122 | { |
c779f7af | 123 | struct tcf_hashinfo *hinfo = a->ops->hinfo; |
89819dc0 WC |
124 | struct hlist_head *head; |
125 | struct hlist_node *n; | |
126 | struct tcf_common *p; | |
4b3550ef | 127 | struct nlattr *nest; |
cc7ec456 | 128 | int i = 0, n_i = 0; |
55334a5d | 129 | int ret = -EINVAL; |
e9ce1cd3 | 130 | |
4b3550ef PM |
131 | nest = nla_nest_start(skb, a->order); |
132 | if (nest == NULL) | |
133 | goto nla_put_failure; | |
1b34ec43 DM |
134 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) |
135 | goto nla_put_failure; | |
e9ce1cd3 | 136 | for (i = 0; i < (hinfo->hmask + 1); i++) { |
89819dc0 WC |
137 | head = &hinfo->htab[tcf_hash(i, hinfo->hmask)]; |
138 | hlist_for_each_entry_safe(p, n, head, tcfc_head) { | |
86062033 | 139 | a->priv = p; |
28e6b67f | 140 | ret = __tcf_hash_release(a, false, true); |
55334a5d | 141 | if (ret == ACT_P_DELETED) { |
cc7ec456 | 142 | module_put(a->ops->owner); |
805c1f4a | 143 | n_i++; |
55334a5d WC |
144 | } else if (ret < 0) |
145 | goto nla_put_failure; | |
e9ce1cd3 DM |
146 | } |
147 | } | |
1b34ec43 DM |
148 | if (nla_put_u32(skb, TCA_FCNT, n_i)) |
149 | goto nla_put_failure; | |
4b3550ef | 150 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
151 | |
152 | return n_i; | |
7ba699c6 | 153 | nla_put_failure: |
4b3550ef | 154 | nla_nest_cancel(skb, nest); |
55334a5d | 155 | return ret; |
e9ce1cd3 DM |
156 | } |
157 | ||
9c75f402 | 158 | static int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb, |
159 | int type, struct tc_action *a) | |
e9ce1cd3 | 160 | { |
e9ce1cd3 | 161 | if (type == RTM_DELACTION) { |
c779f7af | 162 | return tcf_del_walker(skb, a); |
e9ce1cd3 | 163 | } else if (type == RTM_GETACTION) { |
c779f7af | 164 | return tcf_dump_walker(skb, cb, a); |
e9ce1cd3 | 165 | } else { |
6ff9c364 | 166 | WARN(1, "tcf_generic_walker: unknown action %d\n", type); |
e9ce1cd3 DM |
167 | return -EINVAL; |
168 | } | |
169 | } | |
e9ce1cd3 | 170 | |
6e6a50c2 | 171 | static struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo) |
e9ce1cd3 | 172 | { |
89819dc0 WC |
173 | struct tcf_common *p = NULL; |
174 | struct hlist_head *head; | |
e9ce1cd3 | 175 | |
89819dc0 WC |
176 | spin_lock_bh(&hinfo->lock); |
177 | head = &hinfo->htab[tcf_hash(index, hinfo->hmask)]; | |
178 | hlist_for_each_entry_rcu(p, head, tcfc_head) | |
e9ce1cd3 DM |
179 | if (p->tcfc_index == index) |
180 | break; | |
89819dc0 | 181 | spin_unlock_bh(&hinfo->lock); |
e9ce1cd3 DM |
182 | |
183 | return p; | |
184 | } | |
e9ce1cd3 | 185 | |
ddafd34f | 186 | u32 tcf_hash_new_index(struct tcf_hashinfo *hinfo) |
e9ce1cd3 | 187 | { |
ddafd34f | 188 | u32 val = hinfo->index; |
e9ce1cd3 DM |
189 | |
190 | do { | |
191 | if (++val == 0) | |
192 | val = 1; | |
193 | } while (tcf_hash_lookup(val, hinfo)); | |
194 | ||
ddafd34f | 195 | hinfo->index = val; |
17569fae | 196 | return val; |
e9ce1cd3 DM |
197 | } |
198 | EXPORT_SYMBOL(tcf_hash_new_index); | |
199 | ||
6e6a50c2 | 200 | int tcf_hash_search(struct tc_action *a, u32 index) |
e9ce1cd3 DM |
201 | { |
202 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
203 | struct tcf_common *p = tcf_hash_lookup(index, hinfo); | |
204 | ||
205 | if (p) { | |
206 | a->priv = p; | |
207 | return 1; | |
208 | } | |
209 | return 0; | |
210 | } | |
6e6a50c2 | 211 | EXPORT_SYMBOL(tcf_hash_search); |
e9ce1cd3 | 212 | |
86062033 | 213 | int tcf_hash_check(u32 index, struct tc_action *a, int bind) |
e9ce1cd3 | 214 | { |
c779f7af | 215 | struct tcf_hashinfo *hinfo = a->ops->hinfo; |
e9ce1cd3 DM |
216 | struct tcf_common *p = NULL; |
217 | if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) { | |
76aab2c1 | 218 | if (bind) |
e9ce1cd3 | 219 | p->tcfc_bindcnt++; |
76aab2c1 | 220 | p->tcfc_refcnt++; |
e9ce1cd3 | 221 | a->priv = p; |
86062033 | 222 | return 1; |
e9ce1cd3 | 223 | } |
86062033 | 224 | return 0; |
e9ce1cd3 DM |
225 | } |
226 | EXPORT_SYMBOL(tcf_hash_check); | |
227 | ||
86062033 WC |
228 | void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est) |
229 | { | |
230 | struct tcf_common *pc = a->priv; | |
231 | if (est) | |
232 | gen_kill_estimator(&pc->tcfc_bstats, | |
233 | &pc->tcfc_rate_est); | |
234 | kfree_rcu(pc, tcfc_rcu); | |
235 | } | |
236 | EXPORT_SYMBOL(tcf_hash_cleanup); | |
237 | ||
238 | int tcf_hash_create(u32 index, struct nlattr *est, struct tc_action *a, | |
239 | int size, int bind) | |
e9ce1cd3 | 240 | { |
c779f7af | 241 | struct tcf_hashinfo *hinfo = a->ops->hinfo; |
e9ce1cd3 DM |
242 | struct tcf_common *p = kzalloc(size, GFP_KERNEL); |
243 | ||
244 | if (unlikely(!p)) | |
86062033 | 245 | return -ENOMEM; |
e9ce1cd3 DM |
246 | p->tcfc_refcnt = 1; |
247 | if (bind) | |
248 | p->tcfc_bindcnt = 1; | |
249 | ||
250 | spin_lock_init(&p->tcfc_lock); | |
89819dc0 | 251 | INIT_HLIST_NODE(&p->tcfc_head); |
ddafd34f | 252 | p->tcfc_index = index ? index : tcf_hash_new_index(hinfo); |
e9ce1cd3 DM |
253 | p->tcfc_tm.install = jiffies; |
254 | p->tcfc_tm.lastuse = jiffies; | |
0e991ec6 | 255 | if (est) { |
22e0f8b9 JF |
256 | int err = gen_new_estimator(&p->tcfc_bstats, NULL, |
257 | &p->tcfc_rate_est, | |
0e991ec6 SH |
258 | &p->tcfc_lock, est); |
259 | if (err) { | |
260 | kfree(p); | |
86062033 | 261 | return err; |
0e991ec6 SH |
262 | } |
263 | } | |
264 | ||
e9ce1cd3 | 265 | a->priv = (void *) p; |
86062033 | 266 | return 0; |
e9ce1cd3 DM |
267 | } |
268 | EXPORT_SYMBOL(tcf_hash_create); | |
269 | ||
86062033 | 270 | void tcf_hash_insert(struct tc_action *a) |
e9ce1cd3 | 271 | { |
86062033 WC |
272 | struct tcf_common *p = a->priv; |
273 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
e9ce1cd3 DM |
274 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); |
275 | ||
89819dc0 WC |
276 | spin_lock_bh(&hinfo->lock); |
277 | hlist_add_head(&p->tcfc_head, &hinfo->htab[h]); | |
278 | spin_unlock_bh(&hinfo->lock); | |
e9ce1cd3 DM |
279 | } |
280 | EXPORT_SYMBOL(tcf_hash_insert); | |
1da177e4 | 281 | |
1f747c26 | 282 | static LIST_HEAD(act_base); |
1da177e4 LT |
283 | static DEFINE_RWLOCK(act_mod_lock); |
284 | ||
4f1e9d89 | 285 | int tcf_register_action(struct tc_action_ops *act, unsigned int mask) |
1da177e4 | 286 | { |
1f747c26 | 287 | struct tc_action_ops *a; |
4f1e9d89 | 288 | int err; |
1da177e4 | 289 | |
a5b5c958 WC |
290 | /* Must supply act, dump and init */ |
291 | if (!act->act || !act->dump || !act->init) | |
76c82d7a JHS |
292 | return -EINVAL; |
293 | ||
382ca8a1 | 294 | /* Supply defaults */ |
63ef6174 JHS |
295 | if (!act->lookup) |
296 | act->lookup = tcf_hash_search; | |
382ca8a1 JHS |
297 | if (!act->walk) |
298 | act->walk = tcf_generic_walker; | |
63ef6174 | 299 | |
4f1e9d89 WC |
300 | act->hinfo = kmalloc(sizeof(struct tcf_hashinfo), GFP_KERNEL); |
301 | if (!act->hinfo) | |
302 | return -ENOMEM; | |
303 | err = tcf_hashinfo_init(act->hinfo, mask); | |
304 | if (err) { | |
305 | kfree(act->hinfo); | |
306 | return err; | |
307 | } | |
308 | ||
1da177e4 | 309 | write_lock(&act_mod_lock); |
1f747c26 | 310 | list_for_each_entry(a, &act_base, head) { |
1da177e4 LT |
311 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { |
312 | write_unlock(&act_mod_lock); | |
4f1e9d89 WC |
313 | tcf_hashinfo_destroy(act->hinfo); |
314 | kfree(act->hinfo); | |
1da177e4 LT |
315 | return -EEXIST; |
316 | } | |
317 | } | |
1f747c26 | 318 | list_add_tail(&act->head, &act_base); |
1da177e4 LT |
319 | write_unlock(&act_mod_lock); |
320 | return 0; | |
321 | } | |
62e3ba1b | 322 | EXPORT_SYMBOL(tcf_register_action); |
1da177e4 LT |
323 | |
324 | int tcf_unregister_action(struct tc_action_ops *act) | |
325 | { | |
1f747c26 | 326 | struct tc_action_ops *a; |
1da177e4 LT |
327 | int err = -ENOENT; |
328 | ||
329 | write_lock(&act_mod_lock); | |
a792866a ED |
330 | list_for_each_entry(a, &act_base, head) { |
331 | if (a == act) { | |
332 | list_del(&act->head); | |
4f1e9d89 WC |
333 | tcf_hashinfo_destroy(act->hinfo); |
334 | kfree(act->hinfo); | |
a792866a | 335 | err = 0; |
1da177e4 | 336 | break; |
a792866a | 337 | } |
1da177e4 LT |
338 | } |
339 | write_unlock(&act_mod_lock); | |
340 | return err; | |
341 | } | |
62e3ba1b | 342 | EXPORT_SYMBOL(tcf_unregister_action); |
1da177e4 LT |
343 | |
344 | /* lookup by name */ | |
345 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
346 | { | |
a792866a | 347 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
348 | |
349 | if (kind) { | |
350 | read_lock(&act_mod_lock); | |
1f747c26 | 351 | list_for_each_entry(a, &act_base, head) { |
1da177e4 | 352 | if (strcmp(kind, a->kind) == 0) { |
a792866a ED |
353 | if (try_module_get(a->owner)) |
354 | res = a; | |
1da177e4 LT |
355 | break; |
356 | } | |
357 | } | |
358 | read_unlock(&act_mod_lock); | |
359 | } | |
a792866a | 360 | return res; |
1da177e4 LT |
361 | } |
362 | ||
7ba699c6 PM |
363 | /* lookup by nlattr */ |
364 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) | |
1da177e4 | 365 | { |
a792866a | 366 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
367 | |
368 | if (kind) { | |
369 | read_lock(&act_mod_lock); | |
1f747c26 | 370 | list_for_each_entry(a, &act_base, head) { |
7ba699c6 | 371 | if (nla_strcmp(kind, a->kind) == 0) { |
a792866a ED |
372 | if (try_module_get(a->owner)) |
373 | res = a; | |
1da177e4 LT |
374 | break; |
375 | } | |
376 | } | |
377 | read_unlock(&act_mod_lock); | |
378 | } | |
a792866a | 379 | return res; |
1da177e4 | 380 | } |
1da177e4 | 381 | |
33be6271 | 382 | int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions, |
10297b99 | 383 | struct tcf_result *res) |
1da177e4 | 384 | { |
dc7f9f6e | 385 | const struct tc_action *a; |
1da177e4 LT |
386 | int ret = -1; |
387 | ||
388 | if (skb->tc_verd & TC_NCLS) { | |
389 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
1da177e4 LT |
390 | ret = TC_ACT_OK; |
391 | goto exec_done; | |
392 | } | |
33be6271 | 393 | list_for_each_entry(a, actions, list) { |
1da177e4 | 394 | repeat: |
63acd680 | 395 | ret = a->ops->act(skb, a, res); |
63acd680 JHS |
396 | if (ret == TC_ACT_REPEAT) |
397 | goto repeat; /* we need a ttl - JHS */ | |
398 | if (ret != TC_ACT_PIPE) | |
399 | goto exec_done; | |
1da177e4 LT |
400 | } |
401 | exec_done: | |
1da177e4 LT |
402 | return ret; |
403 | } | |
62e3ba1b | 404 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 | 405 | |
55334a5d | 406 | int tcf_action_destroy(struct list_head *actions, int bind) |
1da177e4 | 407 | { |
33be6271 | 408 | struct tc_action *a, *tmp; |
55334a5d | 409 | int ret = 0; |
1da177e4 | 410 | |
33be6271 | 411 | list_for_each_entry_safe(a, tmp, actions, list) { |
28e6b67f | 412 | ret = __tcf_hash_release(a, bind, true); |
55334a5d | 413 | if (ret == ACT_P_DELETED) |
63acd680 | 414 | module_put(a->ops->owner); |
55334a5d WC |
415 | else if (ret < 0) |
416 | return ret; | |
63acd680 JHS |
417 | list_del(&a->list); |
418 | kfree(a); | |
1da177e4 | 419 | } |
55334a5d | 420 | return ret; |
1da177e4 LT |
421 | } |
422 | ||
423 | int | |
424 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
425 | { | |
1da177e4 LT |
426 | return a->ops->dump(skb, a, bind, ref); |
427 | } | |
428 | ||
429 | int | |
430 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
431 | { | |
432 | int err = -EINVAL; | |
27a884dc | 433 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 434 | struct nlattr *nest; |
1da177e4 | 435 | |
1b34ec43 DM |
436 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) |
437 | goto nla_put_failure; | |
1da177e4 | 438 | if (tcf_action_copy_stats(skb, a, 0)) |
7ba699c6 | 439 | goto nla_put_failure; |
4b3550ef PM |
440 | nest = nla_nest_start(skb, TCA_OPTIONS); |
441 | if (nest == NULL) | |
442 | goto nla_put_failure; | |
cc7ec456 ED |
443 | err = tcf_action_dump_old(skb, a, bind, ref); |
444 | if (err > 0) { | |
4b3550ef | 445 | nla_nest_end(skb, nest); |
1da177e4 LT |
446 | return err; |
447 | } | |
448 | ||
7ba699c6 | 449 | nla_put_failure: |
dc5fc579 | 450 | nlmsg_trim(skb, b); |
1da177e4 LT |
451 | return -1; |
452 | } | |
62e3ba1b | 453 | EXPORT_SYMBOL(tcf_action_dump_1); |
1da177e4 LT |
454 | |
455 | int | |
33be6271 | 456 | tcf_action_dump(struct sk_buff *skb, struct list_head *actions, int bind, int ref) |
1da177e4 LT |
457 | { |
458 | struct tc_action *a; | |
459 | int err = -EINVAL; | |
4b3550ef | 460 | struct nlattr *nest; |
1da177e4 | 461 | |
33be6271 | 462 | list_for_each_entry(a, actions, list) { |
4b3550ef PM |
463 | nest = nla_nest_start(skb, a->order); |
464 | if (nest == NULL) | |
465 | goto nla_put_failure; | |
1da177e4 LT |
466 | err = tcf_action_dump_1(skb, a, bind, ref); |
467 | if (err < 0) | |
4fe683f5 | 468 | goto errout; |
4b3550ef | 469 | nla_nest_end(skb, nest); |
1da177e4 LT |
470 | } |
471 | ||
472 | return 0; | |
473 | ||
7ba699c6 | 474 | nla_put_failure: |
4fe683f5 TG |
475 | err = -EINVAL; |
476 | errout: | |
4b3550ef | 477 | nla_nest_cancel(skb, nest); |
4fe683f5 | 478 | return err; |
1da177e4 LT |
479 | } |
480 | ||
c1b52739 BL |
481 | struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla, |
482 | struct nlattr *est, char *name, int ovr, | |
483 | int bind) | |
1da177e4 LT |
484 | { |
485 | struct tc_action *a; | |
486 | struct tc_action_ops *a_o; | |
487 | char act_name[IFNAMSIZ]; | |
cc7ec456 | 488 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 489 | struct nlattr *kind; |
ab27cfb8 | 490 | int err; |
1da177e4 | 491 | |
1da177e4 | 492 | if (name == NULL) { |
cee63723 PM |
493 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
494 | if (err < 0) | |
1da177e4 | 495 | goto err_out; |
cee63723 | 496 | err = -EINVAL; |
7ba699c6 | 497 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
498 | if (kind == NULL) |
499 | goto err_out; | |
7ba699c6 | 500 | if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) |
1da177e4 LT |
501 | goto err_out; |
502 | } else { | |
cee63723 | 503 | err = -EINVAL; |
1da177e4 LT |
504 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) |
505 | goto err_out; | |
506 | } | |
507 | ||
508 | a_o = tc_lookup_action_n(act_name); | |
509 | if (a_o == NULL) { | |
95a5afca | 510 | #ifdef CONFIG_MODULES |
1da177e4 | 511 | rtnl_unlock(); |
4bba3925 | 512 | request_module("act_%s", act_name); |
1da177e4 LT |
513 | rtnl_lock(); |
514 | ||
515 | a_o = tc_lookup_action_n(act_name); | |
516 | ||
517 | /* We dropped the RTNL semaphore in order to | |
518 | * perform the module load. So, even if we | |
519 | * succeeded in loading the module we have to | |
520 | * tell the caller to replay the request. We | |
521 | * indicate this using -EAGAIN. | |
522 | */ | |
523 | if (a_o != NULL) { | |
ab27cfb8 | 524 | err = -EAGAIN; |
1da177e4 LT |
525 | goto err_mod; |
526 | } | |
527 | #endif | |
ab27cfb8 | 528 | err = -ENOENT; |
1da177e4 LT |
529 | goto err_out; |
530 | } | |
531 | ||
ab27cfb8 | 532 | err = -ENOMEM; |
0da974f4 | 533 | a = kzalloc(sizeof(*a), GFP_KERNEL); |
1da177e4 LT |
534 | if (a == NULL) |
535 | goto err_mod; | |
1da177e4 | 536 | |
c779f7af | 537 | a->ops = a_o; |
33be6271 | 538 | INIT_LIST_HEAD(&a->list); |
1da177e4 LT |
539 | /* backward compatibility for policer */ |
540 | if (name == NULL) | |
c1b52739 | 541 | err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, a, ovr, bind); |
1da177e4 | 542 | else |
c1b52739 | 543 | err = a_o->init(net, nla, est, a, ovr, bind); |
ab27cfb8 | 544 | if (err < 0) |
1da177e4 LT |
545 | goto err_free; |
546 | ||
547 | /* module count goes up only when brand new policy is created | |
cc7ec456 ED |
548 | * if it exists and is only bound to in a_o->init() then |
549 | * ACT_P_CREATED is not returned (a zero is). | |
550 | */ | |
ab27cfb8 | 551 | if (err != ACT_P_CREATED) |
1da177e4 | 552 | module_put(a_o->owner); |
1da177e4 | 553 | |
1da177e4 LT |
554 | return a; |
555 | ||
556 | err_free: | |
557 | kfree(a); | |
558 | err_mod: | |
559 | module_put(a_o->owner); | |
560 | err_out: | |
ab27cfb8 | 561 | return ERR_PTR(err); |
1da177e4 LT |
562 | } |
563 | ||
33be6271 | 564 | int tcf_action_init(struct net *net, struct nlattr *nla, |
c1b52739 | 565 | struct nlattr *est, char *name, int ovr, |
33be6271 | 566 | int bind, struct list_head *actions) |
1da177e4 | 567 | { |
cc7ec456 | 568 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 | 569 | struct tc_action *act; |
cee63723 | 570 | int err; |
1da177e4 LT |
571 | int i; |
572 | ||
cee63723 PM |
573 | err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
574 | if (err < 0) | |
33be6271 | 575 | return err; |
1da177e4 | 576 | |
7ba699c6 | 577 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
c1b52739 | 578 | act = tcf_action_init_1(net, tb[i], est, name, ovr, bind); |
33be6271 WC |
579 | if (IS_ERR(act)) { |
580 | err = PTR_ERR(act); | |
1da177e4 | 581 | goto err; |
33be6271 | 582 | } |
7ba699c6 | 583 | act->order = i; |
33be6271 | 584 | list_add_tail(&act->list, actions); |
1da177e4 | 585 | } |
33be6271 | 586 | return 0; |
1da177e4 LT |
587 | |
588 | err: | |
33be6271 WC |
589 | tcf_action_destroy(actions, bind); |
590 | return err; | |
1da177e4 LT |
591 | } |
592 | ||
593 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a, | |
594 | int compat_mode) | |
595 | { | |
596 | int err = 0; | |
597 | struct gnet_dump d; | |
7eb8896d | 598 | struct tcf_common *p = a->priv; |
10297b99 | 599 | |
7eb8896d | 600 | if (p == NULL) |
1da177e4 LT |
601 | goto errout; |
602 | ||
603 | /* compat_mode being true specifies a call that is supposed | |
06fe9fb4 | 604 | * to add additional backward compatibility statistic TLVs. |
1da177e4 LT |
605 | */ |
606 | if (compat_mode) { | |
607 | if (a->type == TCA_OLD_COMPAT) | |
608 | err = gnet_stats_start_copy_compat(skb, 0, | |
7eb8896d | 609 | TCA_STATS, TCA_XSTATS, &p->tcfc_lock, &d); |
1da177e4 LT |
610 | else |
611 | return 0; | |
612 | } else | |
613 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
7eb8896d | 614 | &p->tcfc_lock, &d); |
1da177e4 LT |
615 | |
616 | if (err < 0) | |
617 | goto errout; | |
618 | ||
22e0f8b9 | 619 | if (gnet_stats_copy_basic(&d, NULL, &p->tcfc_bstats) < 0 || |
7eb8896d WC |
620 | gnet_stats_copy_rate_est(&d, &p->tcfc_bstats, |
621 | &p->tcfc_rate_est) < 0 || | |
b0ab6f92 | 622 | gnet_stats_copy_queue(&d, NULL, |
64015853 JF |
623 | &p->tcfc_qstats, |
624 | p->tcfc_qstats.qlen) < 0) | |
1da177e4 LT |
625 | goto errout; |
626 | ||
627 | if (gnet_stats_finish_copy(&d) < 0) | |
628 | goto errout; | |
629 | ||
630 | return 0; | |
631 | ||
632 | errout: | |
633 | return -1; | |
634 | } | |
635 | ||
636 | static int | |
33be6271 | 637 | tca_get_fill(struct sk_buff *skb, struct list_head *actions, u32 portid, u32 seq, |
10297b99 | 638 | u16 flags, int event, int bind, int ref) |
1da177e4 LT |
639 | { |
640 | struct tcamsg *t; | |
641 | struct nlmsghdr *nlh; | |
27a884dc | 642 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 643 | struct nlattr *nest; |
1da177e4 | 644 | |
15e47304 | 645 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags); |
8b00a53c DM |
646 | if (!nlh) |
647 | goto out_nlmsg_trim; | |
648 | t = nlmsg_data(nlh); | |
1da177e4 | 649 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
650 | t->tca__pad1 = 0; |
651 | t->tca__pad2 = 0; | |
10297b99 | 652 | |
4b3550ef PM |
653 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
654 | if (nest == NULL) | |
8b00a53c | 655 | goto out_nlmsg_trim; |
1da177e4 | 656 | |
33be6271 | 657 | if (tcf_action_dump(skb, actions, bind, ref) < 0) |
8b00a53c | 658 | goto out_nlmsg_trim; |
1da177e4 | 659 | |
4b3550ef | 660 | nla_nest_end(skb, nest); |
10297b99 | 661 | |
27a884dc | 662 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
663 | return skb->len; |
664 | ||
8b00a53c | 665 | out_nlmsg_trim: |
dc5fc579 | 666 | nlmsg_trim(skb, b); |
1da177e4 LT |
667 | return -1; |
668 | } | |
669 | ||
670 | static int | |
15e47304 | 671 | act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n, |
33be6271 | 672 | struct list_head *actions, int event) |
1da177e4 LT |
673 | { |
674 | struct sk_buff *skb; | |
1da177e4 LT |
675 | |
676 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
677 | if (!skb) | |
678 | return -ENOBUFS; | |
33be6271 | 679 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { |
1da177e4 LT |
680 | kfree_skb(skb); |
681 | return -EINVAL; | |
682 | } | |
2942e900 | 683 | |
15e47304 | 684 | return rtnl_unicast(skb, net, portid); |
1da177e4 LT |
685 | } |
686 | ||
03701d6e WC |
687 | static struct tc_action *create_a(int i) |
688 | { | |
689 | struct tc_action *act; | |
690 | ||
691 | act = kzalloc(sizeof(*act), GFP_KERNEL); | |
692 | if (act == NULL) { | |
693 | pr_debug("create_a: failed to alloc!\n"); | |
694 | return NULL; | |
695 | } | |
696 | act->order = i; | |
697 | INIT_LIST_HEAD(&act->list); | |
698 | return act; | |
699 | } | |
700 | ||
1da177e4 | 701 | static struct tc_action * |
15e47304 | 702 | tcf_action_get_1(struct nlattr *nla, struct nlmsghdr *n, u32 portid) |
1da177e4 | 703 | { |
cc7ec456 | 704 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
1da177e4 LT |
705 | struct tc_action *a; |
706 | int index; | |
ab27cfb8 | 707 | int err; |
1da177e4 | 708 | |
cee63723 PM |
709 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
710 | if (err < 0) | |
ab27cfb8 | 711 | goto err_out; |
1da177e4 | 712 | |
cee63723 | 713 | err = -EINVAL; |
7ba699c6 PM |
714 | if (tb[TCA_ACT_INDEX] == NULL || |
715 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) | |
ab27cfb8 | 716 | goto err_out; |
1587bac4 | 717 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 718 | |
ab27cfb8 | 719 | err = -ENOMEM; |
03701d6e | 720 | a = create_a(0); |
1da177e4 | 721 | if (a == NULL) |
ab27cfb8 | 722 | goto err_out; |
1da177e4 | 723 | |
ab27cfb8 | 724 | err = -EINVAL; |
7ba699c6 | 725 | a->ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
63acd680 | 726 | if (a->ops == NULL) /* could happen in batch of actions */ |
1da177e4 | 727 | goto err_free; |
ab27cfb8 | 728 | err = -ENOENT; |
1da177e4 LT |
729 | if (a->ops->lookup(a, index) == 0) |
730 | goto err_mod; | |
731 | ||
732 | module_put(a->ops->owner); | |
1da177e4 | 733 | return a; |
ab27cfb8 | 734 | |
1da177e4 LT |
735 | err_mod: |
736 | module_put(a->ops->owner); | |
737 | err_free: | |
738 | kfree(a); | |
ab27cfb8 PM |
739 | err_out: |
740 | return ERR_PTR(err); | |
1da177e4 LT |
741 | } |
742 | ||
33be6271 | 743 | static void cleanup_a(struct list_head *actions) |
1da177e4 | 744 | { |
33be6271 | 745 | struct tc_action *a, *tmp; |
1da177e4 | 746 | |
33be6271 WC |
747 | list_for_each_entry_safe(a, tmp, actions, list) { |
748 | list_del(&a->list); | |
1da177e4 LT |
749 | kfree(a); |
750 | } | |
751 | } | |
752 | ||
7316ae88 | 753 | static int tca_action_flush(struct net *net, struct nlattr *nla, |
15e47304 | 754 | struct nlmsghdr *n, u32 portid) |
1da177e4 LT |
755 | { |
756 | struct sk_buff *skb; | |
757 | unsigned char *b; | |
758 | struct nlmsghdr *nlh; | |
759 | struct tcamsg *t; | |
760 | struct netlink_callback dcb; | |
4b3550ef | 761 | struct nlattr *nest; |
cc7ec456 | 762 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 763 | struct nlattr *kind; |
03701d6e | 764 | struct tc_action a; |
36723873 | 765 | int err = -ENOMEM; |
1da177e4 | 766 | |
1da177e4 LT |
767 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
768 | if (!skb) { | |
6ff9c364 | 769 | pr_debug("tca_action_flush: failed skb alloc\n"); |
36723873 | 770 | return err; |
1da177e4 LT |
771 | } |
772 | ||
27a884dc | 773 | b = skb_tail_pointer(skb); |
1da177e4 | 774 | |
cee63723 PM |
775 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
776 | if (err < 0) | |
1da177e4 LT |
777 | goto err_out; |
778 | ||
cee63723 | 779 | err = -EINVAL; |
7ba699c6 | 780 | kind = tb[TCA_ACT_KIND]; |
03701d6e WC |
781 | memset(&a, 0, sizeof(struct tc_action)); |
782 | INIT_LIST_HEAD(&a.list); | |
783 | a.ops = tc_lookup_action(kind); | |
784 | if (a.ops == NULL) /*some idjot trying to flush unknown action */ | |
1da177e4 LT |
785 | goto err_out; |
786 | ||
15e47304 | 787 | nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t), 0); |
8b00a53c DM |
788 | if (!nlh) |
789 | goto out_module_put; | |
790 | t = nlmsg_data(nlh); | |
1da177e4 | 791 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
792 | t->tca__pad1 = 0; |
793 | t->tca__pad2 = 0; | |
1da177e4 | 794 | |
4b3550ef PM |
795 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
796 | if (nest == NULL) | |
8b00a53c | 797 | goto out_module_put; |
1da177e4 | 798 | |
03701d6e | 799 | err = a.ops->walk(skb, &dcb, RTM_DELACTION, &a); |
1da177e4 | 800 | if (err < 0) |
8b00a53c | 801 | goto out_module_put; |
f97017cd JHS |
802 | if (err == 0) |
803 | goto noflush_out; | |
1da177e4 | 804 | |
4b3550ef | 805 | nla_nest_end(skb, nest); |
1da177e4 | 806 | |
27a884dc | 807 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 | 808 | nlh->nlmsg_flags |= NLM_F_ROOT; |
03701d6e | 809 | module_put(a.ops->owner); |
15e47304 | 810 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 811 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
812 | if (err > 0) |
813 | return 0; | |
814 | ||
815 | return err; | |
816 | ||
8b00a53c | 817 | out_module_put: |
03701d6e | 818 | module_put(a.ops->owner); |
1da177e4 | 819 | err_out: |
f97017cd | 820 | noflush_out: |
1da177e4 | 821 | kfree_skb(skb); |
1da177e4 LT |
822 | return err; |
823 | } | |
824 | ||
a56e1953 WC |
825 | static int |
826 | tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions, | |
827 | u32 portid) | |
828 | { | |
829 | int ret; | |
830 | struct sk_buff *skb; | |
831 | ||
832 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
833 | if (!skb) | |
834 | return -ENOBUFS; | |
835 | ||
836 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION, | |
837 | 0, 1) <= 0) { | |
838 | kfree_skb(skb); | |
839 | return -EINVAL; | |
840 | } | |
841 | ||
842 | /* now do the delete */ | |
55334a5d WC |
843 | ret = tcf_action_destroy(actions, 0); |
844 | if (ret < 0) { | |
845 | kfree_skb(skb); | |
846 | return ret; | |
847 | } | |
a56e1953 WC |
848 | |
849 | ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
850 | n->nlmsg_flags & NLM_F_ECHO); | |
851 | if (ret > 0) | |
852 | return 0; | |
853 | return ret; | |
854 | } | |
855 | ||
1da177e4 | 856 | static int |
7316ae88 | 857 | tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
15e47304 | 858 | u32 portid, int event) |
1da177e4 | 859 | { |
cee63723 | 860 | int i, ret; |
cc7ec456 | 861 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 WC |
862 | struct tc_action *act; |
863 | LIST_HEAD(actions); | |
1da177e4 | 864 | |
cee63723 PM |
865 | ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
866 | if (ret < 0) | |
867 | return ret; | |
1da177e4 | 868 | |
cc7ec456 | 869 | if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) { |
f97017cd | 870 | if (tb[1] != NULL) |
15e47304 | 871 | return tca_action_flush(net, tb[1], n, portid); |
f97017cd JHS |
872 | else |
873 | return -EINVAL; | |
1da177e4 LT |
874 | } |
875 | ||
7ba699c6 | 876 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
15e47304 | 877 | act = tcf_action_get_1(tb[i], n, portid); |
ab27cfb8 PM |
878 | if (IS_ERR(act)) { |
879 | ret = PTR_ERR(act); | |
1da177e4 | 880 | goto err; |
ab27cfb8 | 881 | } |
7ba699c6 | 882 | act->order = i; |
33be6271 | 883 | list_add_tail(&act->list, &actions); |
1da177e4 LT |
884 | } |
885 | ||
886 | if (event == RTM_GETACTION) | |
33be6271 | 887 | ret = act_get_notify(net, portid, n, &actions, event); |
1da177e4 | 888 | else { /* delete */ |
a56e1953 WC |
889 | ret = tcf_del_notify(net, n, &actions, portid); |
890 | if (ret) | |
1da177e4 | 891 | goto err; |
1da177e4 LT |
892 | return ret; |
893 | } | |
894 | err: | |
33be6271 | 895 | cleanup_a(&actions); |
1da177e4 LT |
896 | return ret; |
897 | } | |
898 | ||
a56e1953 WC |
899 | static int |
900 | tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions, | |
901 | u32 portid) | |
1da177e4 | 902 | { |
1da177e4 | 903 | struct sk_buff *skb; |
1da177e4 LT |
904 | int err = 0; |
905 | ||
906 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
907 | if (!skb) | |
908 | return -ENOBUFS; | |
909 | ||
a56e1953 WC |
910 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags, |
911 | RTM_NEWACTION, 0, 0) <= 0) { | |
912 | kfree_skb(skb); | |
913 | return -EINVAL; | |
914 | } | |
10297b99 | 915 | |
a56e1953 WC |
916 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
917 | n->nlmsg_flags & NLM_F_ECHO); | |
1da177e4 LT |
918 | if (err > 0) |
919 | err = 0; | |
920 | return err; | |
1da177e4 LT |
921 | } |
922 | ||
1da177e4 | 923 | static int |
7316ae88 | 924 | tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
15e47304 | 925 | u32 portid, int ovr) |
1da177e4 LT |
926 | { |
927 | int ret = 0; | |
33be6271 | 928 | LIST_HEAD(actions); |
1da177e4 | 929 | |
33be6271 WC |
930 | ret = tcf_action_init(net, nla, NULL, NULL, ovr, 0, &actions); |
931 | if (ret) | |
ab27cfb8 | 932 | goto done; |
1da177e4 LT |
933 | |
934 | /* dump then free all the actions after update; inserted policy | |
935 | * stays intact | |
cc7ec456 | 936 | */ |
a56e1953 | 937 | ret = tcf_add_notify(net, n, &actions, portid); |
33be6271 | 938 | cleanup_a(&actions); |
1da177e4 LT |
939 | done: |
940 | return ret; | |
941 | } | |
942 | ||
661d2967 | 943 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 944 | { |
3b1e0a65 | 945 | struct net *net = sock_net(skb->sk); |
7ba699c6 | 946 | struct nlattr *tca[TCA_ACT_MAX + 1]; |
15e47304 | 947 | u32 portid = skb ? NETLINK_CB(skb).portid : 0; |
1da177e4 LT |
948 | int ret = 0, ovr = 0; |
949 | ||
90f62cf3 | 950 | if ((n->nlmsg_type != RTM_GETACTION) && !netlink_capable(skb, CAP_NET_ADMIN)) |
dfc47ef8 EB |
951 | return -EPERM; |
952 | ||
7ba699c6 PM |
953 | ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL); |
954 | if (ret < 0) | |
955 | return ret; | |
956 | ||
957 | if (tca[TCA_ACT_TAB] == NULL) { | |
6ff9c364 | 958 | pr_notice("tc_ctl_action: received NO action attribs\n"); |
1da177e4 LT |
959 | return -EINVAL; |
960 | } | |
961 | ||
cc7ec456 | 962 | /* n->nlmsg_flags & NLM_F_CREATE */ |
1da177e4 LT |
963 | switch (n->nlmsg_type) { |
964 | case RTM_NEWACTION: | |
965 | /* we are going to assume all other flags | |
25985edc | 966 | * imply create only if it doesn't exist |
1da177e4 LT |
967 | * Note that CREATE | EXCL implies that |
968 | * but since we want avoid ambiguity (eg when flags | |
969 | * is zero) then just set this | |
970 | */ | |
cc7ec456 | 971 | if (n->nlmsg_flags & NLM_F_REPLACE) |
1da177e4 LT |
972 | ovr = 1; |
973 | replay: | |
15e47304 | 974 | ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr); |
1da177e4 LT |
975 | if (ret == -EAGAIN) |
976 | goto replay; | |
977 | break; | |
978 | case RTM_DELACTION: | |
7316ae88 | 979 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
15e47304 | 980 | portid, RTM_DELACTION); |
1da177e4 LT |
981 | break; |
982 | case RTM_GETACTION: | |
7316ae88 | 983 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
15e47304 | 984 | portid, RTM_GETACTION); |
1da177e4 LT |
985 | break; |
986 | default: | |
987 | BUG(); | |
988 | } | |
989 | ||
990 | return ret; | |
991 | } | |
992 | ||
7ba699c6 | 993 | static struct nlattr * |
3a6c2b41 | 994 | find_dump_kind(const struct nlmsghdr *n) |
1da177e4 | 995 | { |
cc7ec456 | 996 | struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1]; |
7ba699c6 PM |
997 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
998 | struct nlattr *nla[TCAA_MAX + 1]; | |
999 | struct nlattr *kind; | |
1da177e4 | 1000 | |
c96c9471 | 1001 | if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0) |
1da177e4 | 1002 | return NULL; |
7ba699c6 | 1003 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
1004 | if (tb1 == NULL) |
1005 | return NULL; | |
1006 | ||
7ba699c6 PM |
1007 | if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), |
1008 | NLMSG_ALIGN(nla_len(tb1)), NULL) < 0) | |
1da177e4 | 1009 | return NULL; |
1da177e4 | 1010 | |
6d834e04 PM |
1011 | if (tb[1] == NULL) |
1012 | return NULL; | |
1013 | if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]), | |
1014 | nla_len(tb[1]), NULL) < 0) | |
1da177e4 | 1015 | return NULL; |
7ba699c6 | 1016 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 1017 | |
26dab893 | 1018 | return kind; |
1da177e4 LT |
1019 | } |
1020 | ||
1021 | static int | |
1022 | tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) | |
1023 | { | |
1024 | struct nlmsghdr *nlh; | |
27a884dc | 1025 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1026 | struct nlattr *nest; |
1da177e4 LT |
1027 | struct tc_action_ops *a_o; |
1028 | struct tc_action a; | |
1029 | int ret = 0; | |
8b00a53c | 1030 | struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh); |
7ba699c6 | 1031 | struct nlattr *kind = find_dump_kind(cb->nlh); |
1da177e4 LT |
1032 | |
1033 | if (kind == NULL) { | |
6ff9c364 | 1034 | pr_info("tc_dump_action: action bad kind\n"); |
1da177e4 LT |
1035 | return 0; |
1036 | } | |
1037 | ||
26dab893 | 1038 | a_o = tc_lookup_action(kind); |
cc7ec456 | 1039 | if (a_o == NULL) |
1da177e4 | 1040 | return 0; |
1da177e4 LT |
1041 | |
1042 | memset(&a, 0, sizeof(struct tc_action)); | |
1043 | a.ops = a_o; | |
1044 | ||
15e47304 | 1045 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
8b00a53c DM |
1046 | cb->nlh->nlmsg_type, sizeof(*t), 0); |
1047 | if (!nlh) | |
1048 | goto out_module_put; | |
1049 | t = nlmsg_data(nlh); | |
1da177e4 | 1050 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1051 | t->tca__pad1 = 0; |
1052 | t->tca__pad2 = 0; | |
1da177e4 | 1053 | |
4b3550ef PM |
1054 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
1055 | if (nest == NULL) | |
8b00a53c | 1056 | goto out_module_put; |
1da177e4 LT |
1057 | |
1058 | ret = a_o->walk(skb, cb, RTM_GETACTION, &a); | |
1059 | if (ret < 0) | |
8b00a53c | 1060 | goto out_module_put; |
1da177e4 LT |
1061 | |
1062 | if (ret > 0) { | |
4b3550ef | 1063 | nla_nest_end(skb, nest); |
1da177e4 LT |
1064 | ret = skb->len; |
1065 | } else | |
4b3550ef | 1066 | nla_nest_cancel(skb, nest); |
1da177e4 | 1067 | |
27a884dc | 1068 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
15e47304 | 1069 | if (NETLINK_CB(cb->skb).portid && ret) |
1da177e4 LT |
1070 | nlh->nlmsg_flags |= NLM_F_MULTI; |
1071 | module_put(a_o->owner); | |
1072 | return skb->len; | |
1073 | ||
8b00a53c | 1074 | out_module_put: |
1da177e4 | 1075 | module_put(a_o->owner); |
dc5fc579 | 1076 | nlmsg_trim(skb, b); |
1da177e4 LT |
1077 | return skb->len; |
1078 | } | |
1079 | ||
1080 | static int __init tc_action_init(void) | |
1081 | { | |
c7ac8679 GR |
1082 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL); |
1083 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL); | |
1084 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, | |
1085 | NULL); | |
1da177e4 | 1086 | |
1da177e4 LT |
1087 | return 0; |
1088 | } | |
1089 | ||
1090 | subsys_initcall(tc_action_init); |