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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 | 26 | #include <net/sch_generic.h> |
1045ba77 | 27 | #include <net/pkt_cls.h> |
1da177e4 | 28 | #include <net/act_api.h> |
dc5fc579 | 29 | #include <net/netlink.h> |
1da177e4 | 30 | |
519c818e ED |
31 | static void free_tcf(struct rcu_head *head) |
32 | { | |
ec0595cc | 33 | struct tc_action *p = container_of(head, struct tc_action, tcfa_rcu); |
519c818e ED |
34 | |
35 | free_percpu(p->cpu_bstats); | |
36 | free_percpu(p->cpu_qstats); | |
1045ba77 JHS |
37 | |
38 | if (p->act_cookie) { | |
39 | kfree(p->act_cookie->data); | |
40 | kfree(p->act_cookie); | |
41 | } | |
42 | ||
519c818e ED |
43 | kfree(p); |
44 | } | |
45 | ||
ec0595cc | 46 | static void tcf_hash_destroy(struct tcf_hashinfo *hinfo, struct tc_action *p) |
e9ce1cd3 | 47 | { |
89819dc0 | 48 | spin_lock_bh(&hinfo->lock); |
ec0595cc | 49 | hlist_del(&p->tcfa_head); |
89819dc0 | 50 | spin_unlock_bh(&hinfo->lock); |
1c0d32fd | 51 | gen_kill_estimator(&p->tcfa_rate_est); |
89819dc0 | 52 | /* |
ec0595cc | 53 | * gen_estimator est_timer() might access p->tcfa_lock |
89819dc0 WC |
54 | * or bstats, wait a RCU grace period before freeing p |
55 | */ | |
ec0595cc | 56 | call_rcu(&p->tcfa_rcu, free_tcf); |
e9ce1cd3 | 57 | } |
e9ce1cd3 | 58 | |
ec0595cc | 59 | int __tcf_hash_release(struct tc_action *p, bool bind, bool strict) |
e9ce1cd3 DM |
60 | { |
61 | int ret = 0; | |
62 | ||
63 | if (p) { | |
64 | if (bind) | |
ec0595cc WC |
65 | p->tcfa_bindcnt--; |
66 | else if (strict && p->tcfa_bindcnt > 0) | |
55334a5d | 67 | return -EPERM; |
e9ce1cd3 | 68 | |
ec0595cc WC |
69 | p->tcfa_refcnt--; |
70 | if (p->tcfa_bindcnt <= 0 && p->tcfa_refcnt <= 0) { | |
71 | if (p->ops->cleanup) | |
72 | p->ops->cleanup(p, bind); | |
ec0595cc | 73 | tcf_hash_destroy(p->hinfo, p); |
1d4150c0 | 74 | ret = ACT_P_DELETED; |
e9ce1cd3 DM |
75 | } |
76 | } | |
28e6b67f | 77 | |
e9ce1cd3 DM |
78 | return ret; |
79 | } | |
28e6b67f | 80 | EXPORT_SYMBOL(__tcf_hash_release); |
e9ce1cd3 | 81 | |
ddf97ccd | 82 | static int tcf_dump_walker(struct tcf_hashinfo *hinfo, struct sk_buff *skb, |
a85a970a | 83 | struct netlink_callback *cb) |
e9ce1cd3 | 84 | { |
cc7ec456 | 85 | int err = 0, index = -1, i = 0, s_i = 0, n_i = 0; |
4b3550ef | 86 | struct nlattr *nest; |
e9ce1cd3 | 87 | |
89819dc0 | 88 | spin_lock_bh(&hinfo->lock); |
e9ce1cd3 DM |
89 | |
90 | s_i = cb->args[0]; | |
91 | ||
92 | for (i = 0; i < (hinfo->hmask + 1); i++) { | |
a85a970a | 93 | struct hlist_head *head; |
ec0595cc | 94 | struct tc_action *p; |
a85a970a | 95 | |
89819dc0 | 96 | head = &hinfo->htab[tcf_hash(i, hinfo->hmask)]; |
e9ce1cd3 | 97 | |
ec0595cc | 98 | hlist_for_each_entry_rcu(p, head, tcfa_head) { |
e9ce1cd3 DM |
99 | index++; |
100 | if (index < s_i) | |
101 | continue; | |
4b3550ef | 102 | |
a85a970a | 103 | nest = nla_nest_start(skb, n_i); |
4b3550ef PM |
104 | if (nest == NULL) |
105 | goto nla_put_failure; | |
ec0595cc | 106 | err = tcf_action_dump_1(skb, p, 0, 0); |
e9ce1cd3 DM |
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 | ||
ddf97ccd | 129 | static int tcf_del_walker(struct tcf_hashinfo *hinfo, struct sk_buff *skb, |
a85a970a | 130 | const struct tc_action_ops *ops) |
e9ce1cd3 | 131 | { |
4b3550ef | 132 | struct nlattr *nest; |
cc7ec456 | 133 | int i = 0, n_i = 0; |
55334a5d | 134 | int ret = -EINVAL; |
e9ce1cd3 | 135 | |
a85a970a | 136 | nest = nla_nest_start(skb, 0); |
4b3550ef PM |
137 | if (nest == NULL) |
138 | goto nla_put_failure; | |
a85a970a | 139 | if (nla_put_string(skb, TCA_KIND, ops->kind)) |
1b34ec43 | 140 | goto nla_put_failure; |
e9ce1cd3 | 141 | for (i = 0; i < (hinfo->hmask + 1); i++) { |
a85a970a WC |
142 | struct hlist_head *head; |
143 | struct hlist_node *n; | |
ec0595cc | 144 | struct tc_action *p; |
a85a970a | 145 | |
89819dc0 | 146 | head = &hinfo->htab[tcf_hash(i, hinfo->hmask)]; |
ec0595cc WC |
147 | hlist_for_each_entry_safe(p, n, head, tcfa_head) { |
148 | ret = __tcf_hash_release(p, false, true); | |
55334a5d | 149 | if (ret == ACT_P_DELETED) { |
ec0595cc | 150 | module_put(p->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 | ||
ddf97ccd WC |
166 | int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, |
167 | struct netlink_callback *cb, int type, | |
a85a970a | 168 | const struct tc_action_ops *ops) |
e9ce1cd3 | 169 | { |
ddf97ccd WC |
170 | struct tcf_hashinfo *hinfo = tn->hinfo; |
171 | ||
e9ce1cd3 | 172 | if (type == RTM_DELACTION) { |
a85a970a | 173 | return tcf_del_walker(hinfo, skb, ops); |
e9ce1cd3 | 174 | } else if (type == RTM_GETACTION) { |
a85a970a | 175 | return tcf_dump_walker(hinfo, skb, cb); |
e9ce1cd3 | 176 | } else { |
6ff9c364 | 177 | WARN(1, "tcf_generic_walker: unknown action %d\n", type); |
e9ce1cd3 DM |
178 | return -EINVAL; |
179 | } | |
180 | } | |
ddf97ccd | 181 | EXPORT_SYMBOL(tcf_generic_walker); |
e9ce1cd3 | 182 | |
ec0595cc | 183 | static struct tc_action *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo) |
e9ce1cd3 | 184 | { |
ec0595cc | 185 | struct tc_action *p = NULL; |
89819dc0 | 186 | struct hlist_head *head; |
e9ce1cd3 | 187 | |
89819dc0 WC |
188 | spin_lock_bh(&hinfo->lock); |
189 | head = &hinfo->htab[tcf_hash(index, hinfo->hmask)]; | |
ec0595cc WC |
190 | hlist_for_each_entry_rcu(p, head, tcfa_head) |
191 | if (p->tcfa_index == index) | |
e9ce1cd3 | 192 | break; |
89819dc0 | 193 | spin_unlock_bh(&hinfo->lock); |
e9ce1cd3 DM |
194 | |
195 | return p; | |
196 | } | |
e9ce1cd3 | 197 | |
ddf97ccd | 198 | u32 tcf_hash_new_index(struct tc_action_net *tn) |
e9ce1cd3 | 199 | { |
ddf97ccd | 200 | struct tcf_hashinfo *hinfo = tn->hinfo; |
ddafd34f | 201 | u32 val = hinfo->index; |
e9ce1cd3 DM |
202 | |
203 | do { | |
204 | if (++val == 0) | |
205 | val = 1; | |
206 | } while (tcf_hash_lookup(val, hinfo)); | |
207 | ||
ddafd34f | 208 | hinfo->index = val; |
17569fae | 209 | return val; |
e9ce1cd3 DM |
210 | } |
211 | EXPORT_SYMBOL(tcf_hash_new_index); | |
212 | ||
a85a970a | 213 | int tcf_hash_search(struct tc_action_net *tn, struct tc_action **a, u32 index) |
e9ce1cd3 | 214 | { |
ddf97ccd | 215 | struct tcf_hashinfo *hinfo = tn->hinfo; |
ec0595cc | 216 | struct tc_action *p = tcf_hash_lookup(index, hinfo); |
e9ce1cd3 DM |
217 | |
218 | if (p) { | |
ec0595cc | 219 | *a = p; |
e9ce1cd3 DM |
220 | return 1; |
221 | } | |
222 | return 0; | |
223 | } | |
6e6a50c2 | 224 | EXPORT_SYMBOL(tcf_hash_search); |
e9ce1cd3 | 225 | |
a85a970a | 226 | bool tcf_hash_check(struct tc_action_net *tn, u32 index, struct tc_action **a, |
b2313077 | 227 | int bind) |
e9ce1cd3 | 228 | { |
ddf97ccd | 229 | struct tcf_hashinfo *hinfo = tn->hinfo; |
ec0595cc WC |
230 | struct tc_action *p = NULL; |
231 | ||
e9ce1cd3 | 232 | if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) { |
76aab2c1 | 233 | if (bind) |
ec0595cc WC |
234 | p->tcfa_bindcnt++; |
235 | p->tcfa_refcnt++; | |
236 | *a = p; | |
b2313077 | 237 | return true; |
e9ce1cd3 | 238 | } |
b2313077 | 239 | return false; |
e9ce1cd3 DM |
240 | } |
241 | EXPORT_SYMBOL(tcf_hash_check); | |
242 | ||
86062033 WC |
243 | void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est) |
244 | { | |
86062033 | 245 | if (est) |
1c0d32fd | 246 | gen_kill_estimator(&a->tcfa_rate_est); |
ec0595cc | 247 | call_rcu(&a->tcfa_rcu, free_tcf); |
86062033 WC |
248 | } |
249 | EXPORT_SYMBOL(tcf_hash_cleanup); | |
250 | ||
ddf97ccd | 251 | int tcf_hash_create(struct tc_action_net *tn, u32 index, struct nlattr *est, |
a85a970a WC |
252 | struct tc_action **a, const struct tc_action_ops *ops, |
253 | int bind, bool cpustats) | |
e9ce1cd3 | 254 | { |
ec0595cc | 255 | struct tc_action *p = kzalloc(ops->size, GFP_KERNEL); |
ddf97ccd | 256 | struct tcf_hashinfo *hinfo = tn->hinfo; |
519c818e | 257 | int err = -ENOMEM; |
e9ce1cd3 DM |
258 | |
259 | if (unlikely(!p)) | |
86062033 | 260 | return -ENOMEM; |
ec0595cc | 261 | p->tcfa_refcnt = 1; |
e9ce1cd3 | 262 | if (bind) |
ec0595cc | 263 | p->tcfa_bindcnt = 1; |
e9ce1cd3 | 264 | |
519c818e ED |
265 | if (cpustats) { |
266 | p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); | |
267 | if (!p->cpu_bstats) { | |
268 | err1: | |
269 | kfree(p); | |
270 | return err; | |
271 | } | |
272 | p->cpu_qstats = alloc_percpu(struct gnet_stats_queue); | |
273 | if (!p->cpu_qstats) { | |
274 | err2: | |
275 | free_percpu(p->cpu_bstats); | |
276 | goto err1; | |
277 | } | |
278 | } | |
ec0595cc WC |
279 | spin_lock_init(&p->tcfa_lock); |
280 | INIT_HLIST_NODE(&p->tcfa_head); | |
281 | p->tcfa_index = index ? index : tcf_hash_new_index(tn); | |
282 | p->tcfa_tm.install = jiffies; | |
283 | p->tcfa_tm.lastuse = jiffies; | |
284 | p->tcfa_tm.firstuse = 0; | |
0e991ec6 | 285 | if (est) { |
ec0595cc WC |
286 | err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats, |
287 | &p->tcfa_rate_est, | |
288 | &p->tcfa_lock, NULL, est); | |
0e991ec6 | 289 | if (err) { |
519c818e ED |
290 | free_percpu(p->cpu_qstats); |
291 | goto err2; | |
0e991ec6 SH |
292 | } |
293 | } | |
294 | ||
ec0595cc WC |
295 | p->hinfo = hinfo; |
296 | p->ops = ops; | |
297 | INIT_LIST_HEAD(&p->list); | |
298 | *a = p; | |
86062033 | 299 | return 0; |
e9ce1cd3 DM |
300 | } |
301 | EXPORT_SYMBOL(tcf_hash_create); | |
302 | ||
ddf97ccd | 303 | void tcf_hash_insert(struct tc_action_net *tn, struct tc_action *a) |
e9ce1cd3 | 304 | { |
ddf97ccd | 305 | struct tcf_hashinfo *hinfo = tn->hinfo; |
ec0595cc | 306 | unsigned int h = tcf_hash(a->tcfa_index, hinfo->hmask); |
e9ce1cd3 | 307 | |
89819dc0 | 308 | spin_lock_bh(&hinfo->lock); |
ec0595cc | 309 | hlist_add_head(&a->tcfa_head, &hinfo->htab[h]); |
89819dc0 | 310 | spin_unlock_bh(&hinfo->lock); |
e9ce1cd3 DM |
311 | } |
312 | EXPORT_SYMBOL(tcf_hash_insert); | |
1da177e4 | 313 | |
ddf97ccd WC |
314 | void tcf_hashinfo_destroy(const struct tc_action_ops *ops, |
315 | struct tcf_hashinfo *hinfo) | |
1d4150c0 | 316 | { |
1d4150c0 WC |
317 | int i; |
318 | ||
319 | for (i = 0; i < hinfo->hmask + 1; i++) { | |
ec0595cc | 320 | struct tc_action *p; |
1d4150c0 WC |
321 | struct hlist_node *n; |
322 | ||
ec0595cc | 323 | hlist_for_each_entry_safe(p, n, &hinfo->htab[i], tcfa_head) { |
1d4150c0 WC |
324 | int ret; |
325 | ||
ec0595cc | 326 | ret = __tcf_hash_release(p, false, true); |
1d4150c0 WC |
327 | if (ret == ACT_P_DELETED) |
328 | module_put(ops->owner); | |
329 | else if (ret < 0) | |
330 | return; | |
331 | } | |
332 | } | |
333 | kfree(hinfo->htab); | |
334 | } | |
ddf97ccd | 335 | EXPORT_SYMBOL(tcf_hashinfo_destroy); |
1d4150c0 | 336 | |
1f747c26 | 337 | static LIST_HEAD(act_base); |
1da177e4 LT |
338 | static DEFINE_RWLOCK(act_mod_lock); |
339 | ||
ddf97ccd WC |
340 | int tcf_register_action(struct tc_action_ops *act, |
341 | struct pernet_operations *ops) | |
1da177e4 | 342 | { |
1f747c26 | 343 | struct tc_action_ops *a; |
ddf97ccd | 344 | int ret; |
1da177e4 | 345 | |
ddf97ccd | 346 | if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup) |
76c82d7a JHS |
347 | return -EINVAL; |
348 | ||
ab102b80 WC |
349 | /* We have to register pernet ops before making the action ops visible, |
350 | * otherwise tcf_action_init_1() could get a partially initialized | |
351 | * netns. | |
352 | */ | |
353 | ret = register_pernet_subsys(ops); | |
354 | if (ret) | |
355 | return ret; | |
356 | ||
1da177e4 | 357 | write_lock(&act_mod_lock); |
1f747c26 | 358 | list_for_each_entry(a, &act_base, head) { |
1da177e4 LT |
359 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { |
360 | write_unlock(&act_mod_lock); | |
ab102b80 | 361 | unregister_pernet_subsys(ops); |
1da177e4 LT |
362 | return -EEXIST; |
363 | } | |
364 | } | |
1f747c26 | 365 | list_add_tail(&act->head, &act_base); |
1da177e4 | 366 | write_unlock(&act_mod_lock); |
ddf97ccd | 367 | |
1da177e4 LT |
368 | return 0; |
369 | } | |
62e3ba1b | 370 | EXPORT_SYMBOL(tcf_register_action); |
1da177e4 | 371 | |
ddf97ccd WC |
372 | int tcf_unregister_action(struct tc_action_ops *act, |
373 | struct pernet_operations *ops) | |
1da177e4 | 374 | { |
1f747c26 | 375 | struct tc_action_ops *a; |
1da177e4 LT |
376 | int err = -ENOENT; |
377 | ||
378 | write_lock(&act_mod_lock); | |
a792866a ED |
379 | list_for_each_entry(a, &act_base, head) { |
380 | if (a == act) { | |
381 | list_del(&act->head); | |
382 | err = 0; | |
1da177e4 | 383 | break; |
a792866a | 384 | } |
1da177e4 LT |
385 | } |
386 | write_unlock(&act_mod_lock); | |
ab102b80 WC |
387 | if (!err) |
388 | unregister_pernet_subsys(ops); | |
1da177e4 LT |
389 | return err; |
390 | } | |
62e3ba1b | 391 | EXPORT_SYMBOL(tcf_unregister_action); |
1da177e4 LT |
392 | |
393 | /* lookup by name */ | |
394 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
395 | { | |
a792866a | 396 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
397 | |
398 | if (kind) { | |
399 | read_lock(&act_mod_lock); | |
1f747c26 | 400 | list_for_each_entry(a, &act_base, head) { |
1da177e4 | 401 | if (strcmp(kind, a->kind) == 0) { |
a792866a ED |
402 | if (try_module_get(a->owner)) |
403 | res = a; | |
1da177e4 LT |
404 | break; |
405 | } | |
406 | } | |
407 | read_unlock(&act_mod_lock); | |
408 | } | |
a792866a | 409 | return res; |
1da177e4 LT |
410 | } |
411 | ||
7ba699c6 PM |
412 | /* lookup by nlattr */ |
413 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) | |
1da177e4 | 414 | { |
a792866a | 415 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
416 | |
417 | if (kind) { | |
418 | read_lock(&act_mod_lock); | |
1f747c26 | 419 | list_for_each_entry(a, &act_base, head) { |
7ba699c6 | 420 | if (nla_strcmp(kind, a->kind) == 0) { |
a792866a ED |
421 | if (try_module_get(a->owner)) |
422 | res = a; | |
1da177e4 LT |
423 | break; |
424 | } | |
425 | } | |
426 | read_unlock(&act_mod_lock); | |
427 | } | |
a792866a | 428 | return res; |
1da177e4 | 429 | } |
1da177e4 | 430 | |
22dc13c8 WC |
431 | int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, |
432 | int nr_actions, struct tcf_result *res) | |
1da177e4 | 433 | { |
22dc13c8 | 434 | int ret = -1, i; |
1da177e4 | 435 | |
e7246e12 WB |
436 | if (skb_skip_tc_classify(skb)) |
437 | return TC_ACT_OK; | |
438 | ||
22dc13c8 WC |
439 | for (i = 0; i < nr_actions; i++) { |
440 | const struct tc_action *a = actions[i]; | |
441 | ||
1da177e4 | 442 | repeat: |
63acd680 | 443 | ret = a->ops->act(skb, a, res); |
63acd680 JHS |
444 | if (ret == TC_ACT_REPEAT) |
445 | goto repeat; /* we need a ttl - JHS */ | |
446 | if (ret != TC_ACT_PIPE) | |
e7246e12 | 447 | break; |
1da177e4 | 448 | } |
1da177e4 LT |
449 | return ret; |
450 | } | |
62e3ba1b | 451 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 | 452 | |
55334a5d | 453 | int tcf_action_destroy(struct list_head *actions, int bind) |
1da177e4 | 454 | { |
33be6271 | 455 | struct tc_action *a, *tmp; |
55334a5d | 456 | int ret = 0; |
1da177e4 | 457 | |
33be6271 | 458 | list_for_each_entry_safe(a, tmp, actions, list) { |
28e6b67f | 459 | ret = __tcf_hash_release(a, bind, true); |
55334a5d | 460 | if (ret == ACT_P_DELETED) |
63acd680 | 461 | module_put(a->ops->owner); |
55334a5d WC |
462 | else if (ret < 0) |
463 | return ret; | |
1da177e4 | 464 | } |
55334a5d | 465 | return ret; |
1da177e4 LT |
466 | } |
467 | ||
468 | int | |
469 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
470 | { | |
1da177e4 LT |
471 | return a->ops->dump(skb, a, bind, ref); |
472 | } | |
473 | ||
474 | int | |
475 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
476 | { | |
477 | int err = -EINVAL; | |
27a884dc | 478 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 479 | struct nlattr *nest; |
1da177e4 | 480 | |
1b34ec43 DM |
481 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) |
482 | goto nla_put_failure; | |
1da177e4 | 483 | if (tcf_action_copy_stats(skb, a, 0)) |
7ba699c6 | 484 | goto nla_put_failure; |
1045ba77 JHS |
485 | if (a->act_cookie) { |
486 | if (nla_put(skb, TCA_ACT_COOKIE, a->act_cookie->len, | |
487 | a->act_cookie->data)) | |
488 | goto nla_put_failure; | |
489 | } | |
490 | ||
4b3550ef PM |
491 | nest = nla_nest_start(skb, TCA_OPTIONS); |
492 | if (nest == NULL) | |
493 | goto nla_put_failure; | |
cc7ec456 ED |
494 | err = tcf_action_dump_old(skb, a, bind, ref); |
495 | if (err > 0) { | |
4b3550ef | 496 | nla_nest_end(skb, nest); |
1da177e4 LT |
497 | return err; |
498 | } | |
499 | ||
7ba699c6 | 500 | nla_put_failure: |
dc5fc579 | 501 | nlmsg_trim(skb, b); |
1da177e4 LT |
502 | return -1; |
503 | } | |
62e3ba1b | 504 | EXPORT_SYMBOL(tcf_action_dump_1); |
1da177e4 | 505 | |
0b0f43fe JHS |
506 | int tcf_action_dump(struct sk_buff *skb, struct list_head *actions, |
507 | int bind, int ref) | |
1da177e4 LT |
508 | { |
509 | struct tc_action *a; | |
510 | int err = -EINVAL; | |
4b3550ef | 511 | struct nlattr *nest; |
1da177e4 | 512 | |
33be6271 | 513 | list_for_each_entry(a, actions, list) { |
4b3550ef PM |
514 | nest = nla_nest_start(skb, a->order); |
515 | if (nest == NULL) | |
516 | goto nla_put_failure; | |
1da177e4 LT |
517 | err = tcf_action_dump_1(skb, a, bind, ref); |
518 | if (err < 0) | |
4fe683f5 | 519 | goto errout; |
4b3550ef | 520 | nla_nest_end(skb, nest); |
1da177e4 LT |
521 | } |
522 | ||
523 | return 0; | |
524 | ||
7ba699c6 | 525 | nla_put_failure: |
4fe683f5 TG |
526 | err = -EINVAL; |
527 | errout: | |
4b3550ef | 528 | nla_nest_cancel(skb, nest); |
4fe683f5 | 529 | return err; |
1da177e4 LT |
530 | } |
531 | ||
6f2e3f7d | 532 | static int nla_memdup_cookie(struct tc_action *a, struct nlattr **tb) |
1045ba77 JHS |
533 | { |
534 | a->act_cookie = kzalloc(sizeof(*a->act_cookie), GFP_KERNEL); | |
535 | if (!a->act_cookie) | |
536 | return -ENOMEM; | |
537 | ||
538 | a->act_cookie->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL); | |
539 | if (!a->act_cookie->data) { | |
540 | kfree(a->act_cookie); | |
541 | return -ENOMEM; | |
542 | } | |
543 | a->act_cookie->len = nla_len(tb[TCA_ACT_COOKIE]); | |
544 | ||
545 | return 0; | |
546 | } | |
547 | ||
c1b52739 BL |
548 | struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla, |
549 | struct nlattr *est, char *name, int ovr, | |
550 | int bind) | |
1da177e4 LT |
551 | { |
552 | struct tc_action *a; | |
553 | struct tc_action_ops *a_o; | |
554 | char act_name[IFNAMSIZ]; | |
cc7ec456 | 555 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 556 | struct nlattr *kind; |
ab27cfb8 | 557 | int err; |
1da177e4 | 558 | |
1da177e4 | 559 | if (name == NULL) { |
fceb6435 | 560 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL); |
cee63723 | 561 | if (err < 0) |
1da177e4 | 562 | goto err_out; |
cee63723 | 563 | err = -EINVAL; |
7ba699c6 | 564 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
565 | if (kind == NULL) |
566 | goto err_out; | |
7ba699c6 | 567 | if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) |
1da177e4 LT |
568 | goto err_out; |
569 | } else { | |
cee63723 | 570 | err = -EINVAL; |
1da177e4 LT |
571 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) |
572 | goto err_out; | |
573 | } | |
574 | ||
575 | a_o = tc_lookup_action_n(act_name); | |
576 | if (a_o == NULL) { | |
95a5afca | 577 | #ifdef CONFIG_MODULES |
1da177e4 | 578 | rtnl_unlock(); |
4bba3925 | 579 | request_module("act_%s", act_name); |
1da177e4 LT |
580 | rtnl_lock(); |
581 | ||
582 | a_o = tc_lookup_action_n(act_name); | |
583 | ||
584 | /* We dropped the RTNL semaphore in order to | |
585 | * perform the module load. So, even if we | |
586 | * succeeded in loading the module we have to | |
587 | * tell the caller to replay the request. We | |
588 | * indicate this using -EAGAIN. | |
589 | */ | |
590 | if (a_o != NULL) { | |
ab27cfb8 | 591 | err = -EAGAIN; |
1da177e4 LT |
592 | goto err_mod; |
593 | } | |
594 | #endif | |
ab27cfb8 | 595 | err = -ENOENT; |
1da177e4 LT |
596 | goto err_out; |
597 | } | |
598 | ||
1da177e4 LT |
599 | /* backward compatibility for policer */ |
600 | if (name == NULL) | |
a85a970a | 601 | err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind); |
1da177e4 | 602 | else |
a85a970a | 603 | err = a_o->init(net, nla, est, &a, ovr, bind); |
ab27cfb8 | 604 | if (err < 0) |
a85a970a | 605 | goto err_mod; |
1da177e4 | 606 | |
1045ba77 JHS |
607 | if (tb[TCA_ACT_COOKIE]) { |
608 | int cklen = nla_len(tb[TCA_ACT_COOKIE]); | |
609 | ||
610 | if (cklen > TC_COOKIE_MAX_SIZE) { | |
611 | err = -EINVAL; | |
612 | tcf_hash_release(a, bind); | |
613 | goto err_mod; | |
614 | } | |
615 | ||
37f1c63e RM |
616 | if (nla_memdup_cookie(a, tb) < 0) { |
617 | err = -ENOMEM; | |
1045ba77 JHS |
618 | tcf_hash_release(a, bind); |
619 | goto err_mod; | |
620 | } | |
621 | } | |
622 | ||
1da177e4 | 623 | /* module count goes up only when brand new policy is created |
cc7ec456 ED |
624 | * if it exists and is only bound to in a_o->init() then |
625 | * ACT_P_CREATED is not returned (a zero is). | |
626 | */ | |
ab27cfb8 | 627 | if (err != ACT_P_CREATED) |
1da177e4 | 628 | module_put(a_o->owner); |
1da177e4 | 629 | |
1da177e4 LT |
630 | return a; |
631 | ||
1da177e4 LT |
632 | err_mod: |
633 | module_put(a_o->owner); | |
634 | err_out: | |
ab27cfb8 | 635 | return ERR_PTR(err); |
1da177e4 LT |
636 | } |
637 | ||
aecc5cef JHS |
638 | static void cleanup_a(struct list_head *actions, int ovr) |
639 | { | |
640 | struct tc_action *a; | |
641 | ||
642 | if (!ovr) | |
643 | return; | |
644 | ||
645 | list_for_each_entry(a, actions, list) | |
646 | a->tcfa_refcnt--; | |
647 | } | |
648 | ||
5a7a5555 JHS |
649 | int tcf_action_init(struct net *net, struct nlattr *nla, struct nlattr *est, |
650 | char *name, int ovr, int bind, struct list_head *actions) | |
1da177e4 | 651 | { |
cc7ec456 | 652 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 | 653 | struct tc_action *act; |
cee63723 | 654 | int err; |
1da177e4 LT |
655 | int i; |
656 | ||
fceb6435 | 657 | err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, NULL); |
cee63723 | 658 | if (err < 0) |
33be6271 | 659 | return err; |
1da177e4 | 660 | |
7ba699c6 | 661 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
c1b52739 | 662 | act = tcf_action_init_1(net, tb[i], est, name, ovr, bind); |
33be6271 WC |
663 | if (IS_ERR(act)) { |
664 | err = PTR_ERR(act); | |
1da177e4 | 665 | goto err; |
33be6271 | 666 | } |
7ba699c6 | 667 | act->order = i; |
aecc5cef JHS |
668 | if (ovr) |
669 | act->tcfa_refcnt++; | |
33be6271 | 670 | list_add_tail(&act->list, actions); |
1da177e4 | 671 | } |
aecc5cef JHS |
672 | |
673 | /* Remove the temp refcnt which was necessary to protect against | |
674 | * destroying an existing action which was being replaced | |
675 | */ | |
676 | cleanup_a(actions, ovr); | |
33be6271 | 677 | return 0; |
1da177e4 LT |
678 | |
679 | err: | |
33be6271 WC |
680 | tcf_action_destroy(actions, bind); |
681 | return err; | |
1da177e4 LT |
682 | } |
683 | ||
ec0595cc | 684 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p, |
1da177e4 LT |
685 | int compat_mode) |
686 | { | |
687 | int err = 0; | |
688 | struct gnet_dump d; | |
10297b99 | 689 | |
7eb8896d | 690 | if (p == NULL) |
1da177e4 LT |
691 | goto errout; |
692 | ||
693 | /* compat_mode being true specifies a call that is supposed | |
06fe9fb4 | 694 | * to add additional backward compatibility statistic TLVs. |
1da177e4 LT |
695 | */ |
696 | if (compat_mode) { | |
ec0595cc | 697 | if (p->type == TCA_OLD_COMPAT) |
1da177e4 | 698 | err = gnet_stats_start_copy_compat(skb, 0, |
9854518e ND |
699 | TCA_STATS, |
700 | TCA_XSTATS, | |
ec0595cc | 701 | &p->tcfa_lock, &d, |
9854518e | 702 | TCA_PAD); |
1da177e4 LT |
703 | else |
704 | return 0; | |
705 | } else | |
706 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
ec0595cc | 707 | &p->tcfa_lock, &d, TCA_ACT_PAD); |
1da177e4 LT |
708 | |
709 | if (err < 0) | |
710 | goto errout; | |
711 | ||
ec0595cc | 712 | if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 || |
1c0d32fd | 713 | gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 || |
519c818e | 714 | gnet_stats_copy_queue(&d, p->cpu_qstats, |
ec0595cc WC |
715 | &p->tcfa_qstats, |
716 | p->tcfa_qstats.qlen) < 0) | |
1da177e4 LT |
717 | goto errout; |
718 | ||
719 | if (gnet_stats_finish_copy(&d) < 0) | |
720 | goto errout; | |
721 | ||
722 | return 0; | |
723 | ||
724 | errout: | |
725 | return -1; | |
726 | } | |
727 | ||
0b0f43fe JHS |
728 | static int tca_get_fill(struct sk_buff *skb, struct list_head *actions, |
729 | u32 portid, u32 seq, u16 flags, int event, int bind, | |
730 | int ref) | |
1da177e4 LT |
731 | { |
732 | struct tcamsg *t; | |
733 | struct nlmsghdr *nlh; | |
27a884dc | 734 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 735 | struct nlattr *nest; |
1da177e4 | 736 | |
15e47304 | 737 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags); |
8b00a53c DM |
738 | if (!nlh) |
739 | goto out_nlmsg_trim; | |
740 | t = nlmsg_data(nlh); | |
1da177e4 | 741 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
742 | t->tca__pad1 = 0; |
743 | t->tca__pad2 = 0; | |
10297b99 | 744 | |
4b3550ef PM |
745 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
746 | if (nest == NULL) | |
8b00a53c | 747 | goto out_nlmsg_trim; |
1da177e4 | 748 | |
33be6271 | 749 | if (tcf_action_dump(skb, actions, bind, ref) < 0) |
8b00a53c | 750 | goto out_nlmsg_trim; |
1da177e4 | 751 | |
4b3550ef | 752 | nla_nest_end(skb, nest); |
10297b99 | 753 | |
27a884dc | 754 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
755 | return skb->len; |
756 | ||
8b00a53c | 757 | out_nlmsg_trim: |
dc5fc579 | 758 | nlmsg_trim(skb, b); |
1da177e4 LT |
759 | return -1; |
760 | } | |
761 | ||
762 | static int | |
15e47304 | 763 | act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n, |
33be6271 | 764 | struct list_head *actions, int event) |
1da177e4 LT |
765 | { |
766 | struct sk_buff *skb; | |
1da177e4 LT |
767 | |
768 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
769 | if (!skb) | |
770 | return -ENOBUFS; | |
0b0f43fe JHS |
771 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, |
772 | 0, 0) <= 0) { | |
1da177e4 LT |
773 | kfree_skb(skb); |
774 | return -EINVAL; | |
775 | } | |
2942e900 | 776 | |
15e47304 | 777 | return rtnl_unicast(skb, net, portid); |
1da177e4 LT |
778 | } |
779 | ||
ddf97ccd WC |
780 | static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla, |
781 | struct nlmsghdr *n, u32 portid) | |
1da177e4 | 782 | { |
cc7ec456 | 783 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
a85a970a | 784 | const struct tc_action_ops *ops; |
1da177e4 LT |
785 | struct tc_action *a; |
786 | int index; | |
ab27cfb8 | 787 | int err; |
1da177e4 | 788 | |
fceb6435 | 789 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL); |
cee63723 | 790 | if (err < 0) |
ab27cfb8 | 791 | goto err_out; |
1da177e4 | 792 | |
cee63723 | 793 | err = -EINVAL; |
7ba699c6 PM |
794 | if (tb[TCA_ACT_INDEX] == NULL || |
795 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) | |
ab27cfb8 | 796 | goto err_out; |
1587bac4 | 797 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 798 | |
ab27cfb8 | 799 | err = -EINVAL; |
a85a970a WC |
800 | ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
801 | if (!ops) /* could happen in batch of actions */ | |
802 | goto err_out; | |
ab27cfb8 | 803 | err = -ENOENT; |
a85a970a | 804 | if (ops->lookup(net, &a, index) == 0) |
1da177e4 LT |
805 | goto err_mod; |
806 | ||
a85a970a | 807 | module_put(ops->owner); |
1da177e4 | 808 | return a; |
ab27cfb8 | 809 | |
1da177e4 | 810 | err_mod: |
a85a970a | 811 | module_put(ops->owner); |
ab27cfb8 PM |
812 | err_out: |
813 | return ERR_PTR(err); | |
1da177e4 LT |
814 | } |
815 | ||
7316ae88 | 816 | static int tca_action_flush(struct net *net, struct nlattr *nla, |
15e47304 | 817 | struct nlmsghdr *n, u32 portid) |
1da177e4 LT |
818 | { |
819 | struct sk_buff *skb; | |
820 | unsigned char *b; | |
821 | struct nlmsghdr *nlh; | |
822 | struct tcamsg *t; | |
823 | struct netlink_callback dcb; | |
4b3550ef | 824 | struct nlattr *nest; |
cc7ec456 | 825 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
a85a970a | 826 | const struct tc_action_ops *ops; |
7ba699c6 | 827 | struct nlattr *kind; |
36723873 | 828 | int err = -ENOMEM; |
1da177e4 | 829 | |
1da177e4 LT |
830 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
831 | if (!skb) { | |
6ff9c364 | 832 | pr_debug("tca_action_flush: failed skb alloc\n"); |
36723873 | 833 | return err; |
1da177e4 LT |
834 | } |
835 | ||
27a884dc | 836 | b = skb_tail_pointer(skb); |
1da177e4 | 837 | |
fceb6435 | 838 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL); |
cee63723 | 839 | if (err < 0) |
1da177e4 LT |
840 | goto err_out; |
841 | ||
cee63723 | 842 | err = -EINVAL; |
7ba699c6 | 843 | kind = tb[TCA_ACT_KIND]; |
a85a970a WC |
844 | ops = tc_lookup_action(kind); |
845 | if (!ops) /*some idjot trying to flush unknown action */ | |
1da177e4 LT |
846 | goto err_out; |
847 | ||
0b0f43fe JHS |
848 | nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, |
849 | sizeof(*t), 0); | |
8b00a53c DM |
850 | if (!nlh) |
851 | goto out_module_put; | |
852 | t = nlmsg_data(nlh); | |
1da177e4 | 853 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
854 | t->tca__pad1 = 0; |
855 | t->tca__pad2 = 0; | |
1da177e4 | 856 | |
4b3550ef PM |
857 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
858 | if (nest == NULL) | |
8b00a53c | 859 | goto out_module_put; |
1da177e4 | 860 | |
a85a970a | 861 | err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops); |
edb9d1bf | 862 | if (err <= 0) |
8b00a53c | 863 | goto out_module_put; |
1da177e4 | 864 | |
4b3550ef | 865 | nla_nest_end(skb, nest); |
1da177e4 | 866 | |
27a884dc | 867 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 | 868 | nlh->nlmsg_flags |= NLM_F_ROOT; |
a85a970a | 869 | module_put(ops->owner); |
15e47304 | 870 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 871 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
872 | if (err > 0) |
873 | return 0; | |
874 | ||
875 | return err; | |
876 | ||
8b00a53c | 877 | out_module_put: |
a85a970a | 878 | module_put(ops->owner); |
1da177e4 LT |
879 | err_out: |
880 | kfree_skb(skb); | |
1da177e4 LT |
881 | return err; |
882 | } | |
883 | ||
a56e1953 WC |
884 | static int |
885 | tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions, | |
886 | u32 portid) | |
887 | { | |
888 | int ret; | |
889 | struct sk_buff *skb; | |
890 | ||
891 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
892 | if (!skb) | |
893 | return -ENOBUFS; | |
894 | ||
895 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION, | |
896 | 0, 1) <= 0) { | |
897 | kfree_skb(skb); | |
898 | return -EINVAL; | |
899 | } | |
900 | ||
901 | /* now do the delete */ | |
55334a5d WC |
902 | ret = tcf_action_destroy(actions, 0); |
903 | if (ret < 0) { | |
904 | kfree_skb(skb); | |
905 | return ret; | |
906 | } | |
a56e1953 WC |
907 | |
908 | ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
909 | n->nlmsg_flags & NLM_F_ECHO); | |
910 | if (ret > 0) | |
911 | return 0; | |
912 | return ret; | |
913 | } | |
914 | ||
1da177e4 | 915 | static int |
7316ae88 | 916 | tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
15e47304 | 917 | u32 portid, int event) |
1da177e4 | 918 | { |
cee63723 | 919 | int i, ret; |
cc7ec456 | 920 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 WC |
921 | struct tc_action *act; |
922 | LIST_HEAD(actions); | |
1da177e4 | 923 | |
fceb6435 | 924 | ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, NULL); |
cee63723 PM |
925 | if (ret < 0) |
926 | return ret; | |
1da177e4 | 927 | |
cc7ec456 | 928 | if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) { |
f97017cd | 929 | if (tb[1] != NULL) |
15e47304 | 930 | return tca_action_flush(net, tb[1], n, portid); |
f97017cd JHS |
931 | else |
932 | return -EINVAL; | |
1da177e4 LT |
933 | } |
934 | ||
7ba699c6 | 935 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
ddf97ccd | 936 | act = tcf_action_get_1(net, tb[i], n, portid); |
ab27cfb8 PM |
937 | if (IS_ERR(act)) { |
938 | ret = PTR_ERR(act); | |
1da177e4 | 939 | goto err; |
ab27cfb8 | 940 | } |
7ba699c6 | 941 | act->order = i; |
33be6271 | 942 | list_add_tail(&act->list, &actions); |
1da177e4 LT |
943 | } |
944 | ||
945 | if (event == RTM_GETACTION) | |
33be6271 | 946 | ret = act_get_notify(net, portid, n, &actions, event); |
1da177e4 | 947 | else { /* delete */ |
a56e1953 WC |
948 | ret = tcf_del_notify(net, n, &actions, portid); |
949 | if (ret) | |
1da177e4 | 950 | goto err; |
1da177e4 LT |
951 | return ret; |
952 | } | |
953 | err: | |
0faa9cb5 JHS |
954 | if (event != RTM_GETACTION) |
955 | tcf_action_destroy(&actions, 0); | |
1da177e4 LT |
956 | return ret; |
957 | } | |
958 | ||
a56e1953 WC |
959 | static int |
960 | tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions, | |
961 | u32 portid) | |
1da177e4 | 962 | { |
1da177e4 | 963 | struct sk_buff *skb; |
1da177e4 LT |
964 | int err = 0; |
965 | ||
966 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
967 | if (!skb) | |
968 | return -ENOBUFS; | |
969 | ||
a56e1953 WC |
970 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags, |
971 | RTM_NEWACTION, 0, 0) <= 0) { | |
972 | kfree_skb(skb); | |
973 | return -EINVAL; | |
974 | } | |
10297b99 | 975 | |
a56e1953 WC |
976 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
977 | n->nlmsg_flags & NLM_F_ECHO); | |
1da177e4 LT |
978 | if (err > 0) |
979 | err = 0; | |
980 | return err; | |
1da177e4 LT |
981 | } |
982 | ||
5a7a5555 JHS |
983 | static int tcf_action_add(struct net *net, struct nlattr *nla, |
984 | struct nlmsghdr *n, u32 portid, int ovr) | |
1da177e4 LT |
985 | { |
986 | int ret = 0; | |
33be6271 | 987 | LIST_HEAD(actions); |
1da177e4 | 988 | |
33be6271 WC |
989 | ret = tcf_action_init(net, nla, NULL, NULL, ovr, 0, &actions); |
990 | if (ret) | |
f07fed82 | 991 | return ret; |
1da177e4 | 992 | |
f07fed82 | 993 | return tcf_add_notify(net, n, &actions, portid); |
1da177e4 LT |
994 | } |
995 | ||
661d2967 | 996 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 997 | { |
3b1e0a65 | 998 | struct net *net = sock_net(skb->sk); |
7ba699c6 | 999 | struct nlattr *tca[TCA_ACT_MAX + 1]; |
15e47304 | 1000 | u32 portid = skb ? NETLINK_CB(skb).portid : 0; |
1da177e4 LT |
1001 | int ret = 0, ovr = 0; |
1002 | ||
0b0f43fe JHS |
1003 | if ((n->nlmsg_type != RTM_GETACTION) && |
1004 | !netlink_capable(skb, CAP_NET_ADMIN)) | |
dfc47ef8 EB |
1005 | return -EPERM; |
1006 | ||
fceb6435 JB |
1007 | ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL, |
1008 | NULL); | |
7ba699c6 PM |
1009 | if (ret < 0) |
1010 | return ret; | |
1011 | ||
1012 | if (tca[TCA_ACT_TAB] == NULL) { | |
6ff9c364 | 1013 | pr_notice("tc_ctl_action: received NO action attribs\n"); |
1da177e4 LT |
1014 | return -EINVAL; |
1015 | } | |
1016 | ||
cc7ec456 | 1017 | /* n->nlmsg_flags & NLM_F_CREATE */ |
1da177e4 LT |
1018 | switch (n->nlmsg_type) { |
1019 | case RTM_NEWACTION: | |
1020 | /* we are going to assume all other flags | |
25985edc | 1021 | * imply create only if it doesn't exist |
1da177e4 LT |
1022 | * Note that CREATE | EXCL implies that |
1023 | * but since we want avoid ambiguity (eg when flags | |
1024 | * is zero) then just set this | |
1025 | */ | |
cc7ec456 | 1026 | if (n->nlmsg_flags & NLM_F_REPLACE) |
1da177e4 LT |
1027 | ovr = 1; |
1028 | replay: | |
15e47304 | 1029 | ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr); |
1da177e4 LT |
1030 | if (ret == -EAGAIN) |
1031 | goto replay; | |
1032 | break; | |
1033 | case RTM_DELACTION: | |
7316ae88 | 1034 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
15e47304 | 1035 | portid, RTM_DELACTION); |
1da177e4 LT |
1036 | break; |
1037 | case RTM_GETACTION: | |
7316ae88 | 1038 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
15e47304 | 1039 | portid, RTM_GETACTION); |
1da177e4 LT |
1040 | break; |
1041 | default: | |
1042 | BUG(); | |
1043 | } | |
1044 | ||
1045 | return ret; | |
1046 | } | |
1047 | ||
5a7a5555 | 1048 | static struct nlattr *find_dump_kind(const struct nlmsghdr *n) |
1da177e4 | 1049 | { |
cc7ec456 | 1050 | struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1]; |
7ba699c6 PM |
1051 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
1052 | struct nlattr *nla[TCAA_MAX + 1]; | |
1053 | struct nlattr *kind; | |
1da177e4 | 1054 | |
fceb6435 JB |
1055 | if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, |
1056 | NULL, NULL) < 0) | |
1da177e4 | 1057 | return NULL; |
7ba699c6 | 1058 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
1059 | if (tb1 == NULL) |
1060 | return NULL; | |
1061 | ||
7ba699c6 | 1062 | if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), |
fceb6435 | 1063 | NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0) |
1da177e4 | 1064 | return NULL; |
1da177e4 | 1065 | |
6d834e04 PM |
1066 | if (tb[1] == NULL) |
1067 | return NULL; | |
fceb6435 | 1068 | if (nla_parse_nested(tb2, TCA_ACT_MAX, tb[1], NULL, NULL) < 0) |
1da177e4 | 1069 | return NULL; |
7ba699c6 | 1070 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 1071 | |
26dab893 | 1072 | return kind; |
1da177e4 LT |
1073 | } |
1074 | ||
5a7a5555 | 1075 | static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 1076 | { |
ddf97ccd | 1077 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1078 | struct nlmsghdr *nlh; |
27a884dc | 1079 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1080 | struct nlattr *nest; |
1da177e4 | 1081 | struct tc_action_ops *a_o; |
1da177e4 | 1082 | int ret = 0; |
8b00a53c | 1083 | struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh); |
7ba699c6 | 1084 | struct nlattr *kind = find_dump_kind(cb->nlh); |
1da177e4 LT |
1085 | |
1086 | if (kind == NULL) { | |
6ff9c364 | 1087 | pr_info("tc_dump_action: action bad kind\n"); |
1da177e4 LT |
1088 | return 0; |
1089 | } | |
1090 | ||
26dab893 | 1091 | a_o = tc_lookup_action(kind); |
cc7ec456 | 1092 | if (a_o == NULL) |
1da177e4 | 1093 | return 0; |
1da177e4 | 1094 | |
15e47304 | 1095 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
8b00a53c DM |
1096 | cb->nlh->nlmsg_type, sizeof(*t), 0); |
1097 | if (!nlh) | |
1098 | goto out_module_put; | |
1099 | t = nlmsg_data(nlh); | |
1da177e4 | 1100 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1101 | t->tca__pad1 = 0; |
1102 | t->tca__pad2 = 0; | |
1da177e4 | 1103 | |
4b3550ef PM |
1104 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
1105 | if (nest == NULL) | |
8b00a53c | 1106 | goto out_module_put; |
1da177e4 | 1107 | |
a85a970a | 1108 | ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o); |
1da177e4 | 1109 | if (ret < 0) |
8b00a53c | 1110 | goto out_module_put; |
1da177e4 LT |
1111 | |
1112 | if (ret > 0) { | |
4b3550ef | 1113 | nla_nest_end(skb, nest); |
1da177e4 LT |
1114 | ret = skb->len; |
1115 | } else | |
ebecaa66 | 1116 | nlmsg_trim(skb, b); |
1da177e4 | 1117 | |
27a884dc | 1118 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
15e47304 | 1119 | if (NETLINK_CB(cb->skb).portid && ret) |
1da177e4 LT |
1120 | nlh->nlmsg_flags |= NLM_F_MULTI; |
1121 | module_put(a_o->owner); | |
1122 | return skb->len; | |
1123 | ||
8b00a53c | 1124 | out_module_put: |
1da177e4 | 1125 | module_put(a_o->owner); |
dc5fc579 | 1126 | nlmsg_trim(skb, b); |
1da177e4 LT |
1127 | return skb->len; |
1128 | } | |
1129 | ||
1130 | static int __init tc_action_init(void) | |
1131 | { | |
c7ac8679 GR |
1132 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL); |
1133 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL); | |
1134 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, | |
1135 | NULL); | |
1da177e4 | 1136 | |
1da177e4 LT |
1137 | return 0; |
1138 | } | |
1139 | ||
1140 | subsys_initcall(tc_action_init); |