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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 | |
db50514f JP |
31 | static int tcf_action_goto_chain_init(struct tc_action *a, struct tcf_proto *tp) |
32 | { | |
33 | u32 chain_index = a->tcfa_action & TC_ACT_EXT_VAL_MASK; | |
34 | ||
35 | if (!tp) | |
36 | return -EINVAL; | |
367a8ce8 | 37 | a->goto_chain = tcf_chain_get(tp->chain->block, chain_index, true); |
db50514f JP |
38 | if (!a->goto_chain) |
39 | return -ENOMEM; | |
40 | return 0; | |
41 | } | |
42 | ||
43 | static void tcf_action_goto_chain_fini(struct tc_action *a) | |
44 | { | |
45 | tcf_chain_put(a->goto_chain); | |
46 | } | |
47 | ||
48 | static void tcf_action_goto_chain_exec(const struct tc_action *a, | |
49 | struct tcf_result *res) | |
50 | { | |
51 | const struct tcf_chain *chain = a->goto_chain; | |
52 | ||
53 | res->goto_tp = rcu_dereference_bh(chain->filter_chain); | |
54 | } | |
55 | ||
519c818e ED |
56 | static void free_tcf(struct rcu_head *head) |
57 | { | |
ec0595cc | 58 | struct tc_action *p = container_of(head, struct tc_action, tcfa_rcu); |
519c818e ED |
59 | |
60 | free_percpu(p->cpu_bstats); | |
61 | free_percpu(p->cpu_qstats); | |
1045ba77 JHS |
62 | |
63 | if (p->act_cookie) { | |
64 | kfree(p->act_cookie->data); | |
65 | kfree(p->act_cookie); | |
66 | } | |
db50514f JP |
67 | if (p->goto_chain) |
68 | tcf_action_goto_chain_fini(p); | |
1045ba77 | 69 | |
519c818e ED |
70 | kfree(p); |
71 | } | |
72 | ||
ec0595cc | 73 | static void tcf_hash_destroy(struct tcf_hashinfo *hinfo, struct tc_action *p) |
e9ce1cd3 | 74 | { |
89819dc0 | 75 | spin_lock_bh(&hinfo->lock); |
ec0595cc | 76 | hlist_del(&p->tcfa_head); |
89819dc0 | 77 | spin_unlock_bh(&hinfo->lock); |
1c0d32fd | 78 | gen_kill_estimator(&p->tcfa_rate_est); |
89819dc0 | 79 | /* |
ec0595cc | 80 | * gen_estimator est_timer() might access p->tcfa_lock |
89819dc0 WC |
81 | * or bstats, wait a RCU grace period before freeing p |
82 | */ | |
ec0595cc | 83 | call_rcu(&p->tcfa_rcu, free_tcf); |
e9ce1cd3 | 84 | } |
e9ce1cd3 | 85 | |
ec0595cc | 86 | int __tcf_hash_release(struct tc_action *p, bool bind, bool strict) |
e9ce1cd3 DM |
87 | { |
88 | int ret = 0; | |
89 | ||
90 | if (p) { | |
91 | if (bind) | |
ec0595cc WC |
92 | p->tcfa_bindcnt--; |
93 | else if (strict && p->tcfa_bindcnt > 0) | |
55334a5d | 94 | return -EPERM; |
e9ce1cd3 | 95 | |
ec0595cc WC |
96 | p->tcfa_refcnt--; |
97 | if (p->tcfa_bindcnt <= 0 && p->tcfa_refcnt <= 0) { | |
98 | if (p->ops->cleanup) | |
99 | p->ops->cleanup(p, bind); | |
ec0595cc | 100 | tcf_hash_destroy(p->hinfo, p); |
1d4150c0 | 101 | ret = ACT_P_DELETED; |
e9ce1cd3 DM |
102 | } |
103 | } | |
28e6b67f | 104 | |
e9ce1cd3 DM |
105 | return ret; |
106 | } | |
28e6b67f | 107 | EXPORT_SYMBOL(__tcf_hash_release); |
e9ce1cd3 | 108 | |
ddf97ccd | 109 | static int tcf_dump_walker(struct tcf_hashinfo *hinfo, struct sk_buff *skb, |
a85a970a | 110 | struct netlink_callback *cb) |
e9ce1cd3 | 111 | { |
cc7ec456 | 112 | int err = 0, index = -1, i = 0, s_i = 0, n_i = 0; |
4b3550ef | 113 | struct nlattr *nest; |
e9ce1cd3 | 114 | |
89819dc0 | 115 | spin_lock_bh(&hinfo->lock); |
e9ce1cd3 DM |
116 | |
117 | s_i = cb->args[0]; | |
118 | ||
119 | for (i = 0; i < (hinfo->hmask + 1); i++) { | |
a85a970a | 120 | struct hlist_head *head; |
ec0595cc | 121 | struct tc_action *p; |
a85a970a | 122 | |
89819dc0 | 123 | head = &hinfo->htab[tcf_hash(i, hinfo->hmask)]; |
e9ce1cd3 | 124 | |
ec0595cc | 125 | hlist_for_each_entry_rcu(p, head, tcfa_head) { |
e9ce1cd3 DM |
126 | index++; |
127 | if (index < s_i) | |
128 | continue; | |
4b3550ef | 129 | |
a85a970a | 130 | nest = nla_nest_start(skb, n_i); |
4b3550ef PM |
131 | if (nest == NULL) |
132 | goto nla_put_failure; | |
ec0595cc | 133 | err = tcf_action_dump_1(skb, p, 0, 0); |
e9ce1cd3 DM |
134 | if (err < 0) { |
135 | index--; | |
4b3550ef | 136 | nlmsg_trim(skb, nest); |
e9ce1cd3 DM |
137 | goto done; |
138 | } | |
4b3550ef | 139 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
140 | n_i++; |
141 | if (n_i >= TCA_ACT_MAX_PRIO) | |
142 | goto done; | |
143 | } | |
144 | } | |
145 | done: | |
89819dc0 | 146 | spin_unlock_bh(&hinfo->lock); |
e9ce1cd3 DM |
147 | if (n_i) |
148 | cb->args[0] += n_i; | |
149 | return n_i; | |
150 | ||
7ba699c6 | 151 | nla_put_failure: |
4b3550ef | 152 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
153 | goto done; |
154 | } | |
155 | ||
ddf97ccd | 156 | static int tcf_del_walker(struct tcf_hashinfo *hinfo, struct sk_buff *skb, |
a85a970a | 157 | const struct tc_action_ops *ops) |
e9ce1cd3 | 158 | { |
4b3550ef | 159 | struct nlattr *nest; |
cc7ec456 | 160 | int i = 0, n_i = 0; |
55334a5d | 161 | int ret = -EINVAL; |
e9ce1cd3 | 162 | |
a85a970a | 163 | nest = nla_nest_start(skb, 0); |
4b3550ef PM |
164 | if (nest == NULL) |
165 | goto nla_put_failure; | |
a85a970a | 166 | if (nla_put_string(skb, TCA_KIND, ops->kind)) |
1b34ec43 | 167 | goto nla_put_failure; |
e9ce1cd3 | 168 | for (i = 0; i < (hinfo->hmask + 1); i++) { |
a85a970a WC |
169 | struct hlist_head *head; |
170 | struct hlist_node *n; | |
ec0595cc | 171 | struct tc_action *p; |
a85a970a | 172 | |
89819dc0 | 173 | head = &hinfo->htab[tcf_hash(i, hinfo->hmask)]; |
ec0595cc WC |
174 | hlist_for_each_entry_safe(p, n, head, tcfa_head) { |
175 | ret = __tcf_hash_release(p, false, true); | |
55334a5d | 176 | if (ret == ACT_P_DELETED) { |
ec0595cc | 177 | module_put(p->ops->owner); |
805c1f4a | 178 | n_i++; |
55334a5d WC |
179 | } else if (ret < 0) |
180 | goto nla_put_failure; | |
e9ce1cd3 DM |
181 | } |
182 | } | |
1b34ec43 DM |
183 | if (nla_put_u32(skb, TCA_FCNT, n_i)) |
184 | goto nla_put_failure; | |
4b3550ef | 185 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
186 | |
187 | return n_i; | |
7ba699c6 | 188 | nla_put_failure: |
4b3550ef | 189 | nla_nest_cancel(skb, nest); |
55334a5d | 190 | return ret; |
e9ce1cd3 DM |
191 | } |
192 | ||
ddf97ccd WC |
193 | int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, |
194 | struct netlink_callback *cb, int type, | |
a85a970a | 195 | const struct tc_action_ops *ops) |
e9ce1cd3 | 196 | { |
ddf97ccd WC |
197 | struct tcf_hashinfo *hinfo = tn->hinfo; |
198 | ||
e9ce1cd3 | 199 | if (type == RTM_DELACTION) { |
a85a970a | 200 | return tcf_del_walker(hinfo, skb, ops); |
e9ce1cd3 | 201 | } else if (type == RTM_GETACTION) { |
a85a970a | 202 | return tcf_dump_walker(hinfo, skb, cb); |
e9ce1cd3 | 203 | } else { |
6ff9c364 | 204 | WARN(1, "tcf_generic_walker: unknown action %d\n", type); |
e9ce1cd3 DM |
205 | return -EINVAL; |
206 | } | |
207 | } | |
ddf97ccd | 208 | EXPORT_SYMBOL(tcf_generic_walker); |
e9ce1cd3 | 209 | |
ec0595cc | 210 | static struct tc_action *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo) |
e9ce1cd3 | 211 | { |
ec0595cc | 212 | struct tc_action *p = NULL; |
89819dc0 | 213 | struct hlist_head *head; |
e9ce1cd3 | 214 | |
89819dc0 WC |
215 | spin_lock_bh(&hinfo->lock); |
216 | head = &hinfo->htab[tcf_hash(index, hinfo->hmask)]; | |
ec0595cc WC |
217 | hlist_for_each_entry_rcu(p, head, tcfa_head) |
218 | if (p->tcfa_index == index) | |
e9ce1cd3 | 219 | break; |
89819dc0 | 220 | spin_unlock_bh(&hinfo->lock); |
e9ce1cd3 DM |
221 | |
222 | return p; | |
223 | } | |
e9ce1cd3 | 224 | |
ddf97ccd | 225 | u32 tcf_hash_new_index(struct tc_action_net *tn) |
e9ce1cd3 | 226 | { |
ddf97ccd | 227 | struct tcf_hashinfo *hinfo = tn->hinfo; |
ddafd34f | 228 | u32 val = hinfo->index; |
e9ce1cd3 DM |
229 | |
230 | do { | |
231 | if (++val == 0) | |
232 | val = 1; | |
233 | } while (tcf_hash_lookup(val, hinfo)); | |
234 | ||
ddafd34f | 235 | hinfo->index = val; |
17569fae | 236 | return val; |
e9ce1cd3 DM |
237 | } |
238 | EXPORT_SYMBOL(tcf_hash_new_index); | |
239 | ||
a85a970a | 240 | int tcf_hash_search(struct tc_action_net *tn, struct tc_action **a, u32 index) |
e9ce1cd3 | 241 | { |
ddf97ccd | 242 | struct tcf_hashinfo *hinfo = tn->hinfo; |
ec0595cc | 243 | struct tc_action *p = tcf_hash_lookup(index, hinfo); |
e9ce1cd3 DM |
244 | |
245 | if (p) { | |
ec0595cc | 246 | *a = p; |
e9ce1cd3 DM |
247 | return 1; |
248 | } | |
249 | return 0; | |
250 | } | |
6e6a50c2 | 251 | EXPORT_SYMBOL(tcf_hash_search); |
e9ce1cd3 | 252 | |
a85a970a | 253 | bool tcf_hash_check(struct tc_action_net *tn, u32 index, struct tc_action **a, |
b2313077 | 254 | int bind) |
e9ce1cd3 | 255 | { |
ddf97ccd | 256 | struct tcf_hashinfo *hinfo = tn->hinfo; |
ec0595cc WC |
257 | struct tc_action *p = NULL; |
258 | ||
e9ce1cd3 | 259 | if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) { |
76aab2c1 | 260 | if (bind) |
ec0595cc WC |
261 | p->tcfa_bindcnt++; |
262 | p->tcfa_refcnt++; | |
263 | *a = p; | |
b2313077 | 264 | return true; |
e9ce1cd3 | 265 | } |
b2313077 | 266 | return false; |
e9ce1cd3 DM |
267 | } |
268 | EXPORT_SYMBOL(tcf_hash_check); | |
269 | ||
86062033 WC |
270 | void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est) |
271 | { | |
86062033 | 272 | if (est) |
1c0d32fd | 273 | gen_kill_estimator(&a->tcfa_rate_est); |
ec0595cc | 274 | call_rcu(&a->tcfa_rcu, free_tcf); |
86062033 WC |
275 | } |
276 | EXPORT_SYMBOL(tcf_hash_cleanup); | |
277 | ||
ddf97ccd | 278 | int tcf_hash_create(struct tc_action_net *tn, u32 index, struct nlattr *est, |
a85a970a WC |
279 | struct tc_action **a, const struct tc_action_ops *ops, |
280 | int bind, bool cpustats) | |
e9ce1cd3 | 281 | { |
ec0595cc | 282 | struct tc_action *p = kzalloc(ops->size, GFP_KERNEL); |
ddf97ccd | 283 | struct tcf_hashinfo *hinfo = tn->hinfo; |
519c818e | 284 | int err = -ENOMEM; |
e9ce1cd3 DM |
285 | |
286 | if (unlikely(!p)) | |
86062033 | 287 | return -ENOMEM; |
ec0595cc | 288 | p->tcfa_refcnt = 1; |
e9ce1cd3 | 289 | if (bind) |
ec0595cc | 290 | p->tcfa_bindcnt = 1; |
e9ce1cd3 | 291 | |
519c818e ED |
292 | if (cpustats) { |
293 | p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); | |
294 | if (!p->cpu_bstats) { | |
295 | err1: | |
296 | kfree(p); | |
297 | return err; | |
298 | } | |
299 | p->cpu_qstats = alloc_percpu(struct gnet_stats_queue); | |
300 | if (!p->cpu_qstats) { | |
301 | err2: | |
302 | free_percpu(p->cpu_bstats); | |
303 | goto err1; | |
304 | } | |
305 | } | |
ec0595cc WC |
306 | spin_lock_init(&p->tcfa_lock); |
307 | INIT_HLIST_NODE(&p->tcfa_head); | |
308 | p->tcfa_index = index ? index : tcf_hash_new_index(tn); | |
309 | p->tcfa_tm.install = jiffies; | |
310 | p->tcfa_tm.lastuse = jiffies; | |
311 | p->tcfa_tm.firstuse = 0; | |
0e991ec6 | 312 | if (est) { |
ec0595cc WC |
313 | err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats, |
314 | &p->tcfa_rate_est, | |
315 | &p->tcfa_lock, NULL, est); | |
0e991ec6 | 316 | if (err) { |
519c818e ED |
317 | free_percpu(p->cpu_qstats); |
318 | goto err2; | |
0e991ec6 SH |
319 | } |
320 | } | |
321 | ||
ec0595cc WC |
322 | p->hinfo = hinfo; |
323 | p->ops = ops; | |
324 | INIT_LIST_HEAD(&p->list); | |
325 | *a = p; | |
86062033 | 326 | return 0; |
e9ce1cd3 DM |
327 | } |
328 | EXPORT_SYMBOL(tcf_hash_create); | |
329 | ||
ddf97ccd | 330 | void tcf_hash_insert(struct tc_action_net *tn, struct tc_action *a) |
e9ce1cd3 | 331 | { |
ddf97ccd | 332 | struct tcf_hashinfo *hinfo = tn->hinfo; |
ec0595cc | 333 | unsigned int h = tcf_hash(a->tcfa_index, hinfo->hmask); |
e9ce1cd3 | 334 | |
89819dc0 | 335 | spin_lock_bh(&hinfo->lock); |
ec0595cc | 336 | hlist_add_head(&a->tcfa_head, &hinfo->htab[h]); |
89819dc0 | 337 | spin_unlock_bh(&hinfo->lock); |
e9ce1cd3 DM |
338 | } |
339 | EXPORT_SYMBOL(tcf_hash_insert); | |
1da177e4 | 340 | |
ddf97ccd WC |
341 | void tcf_hashinfo_destroy(const struct tc_action_ops *ops, |
342 | struct tcf_hashinfo *hinfo) | |
1d4150c0 | 343 | { |
1d4150c0 WC |
344 | int i; |
345 | ||
346 | for (i = 0; i < hinfo->hmask + 1; i++) { | |
ec0595cc | 347 | struct tc_action *p; |
1d4150c0 WC |
348 | struct hlist_node *n; |
349 | ||
ec0595cc | 350 | hlist_for_each_entry_safe(p, n, &hinfo->htab[i], tcfa_head) { |
1d4150c0 WC |
351 | int ret; |
352 | ||
ec0595cc | 353 | ret = __tcf_hash_release(p, false, true); |
1d4150c0 WC |
354 | if (ret == ACT_P_DELETED) |
355 | module_put(ops->owner); | |
356 | else if (ret < 0) | |
357 | return; | |
358 | } | |
359 | } | |
360 | kfree(hinfo->htab); | |
361 | } | |
ddf97ccd | 362 | EXPORT_SYMBOL(tcf_hashinfo_destroy); |
1d4150c0 | 363 | |
1f747c26 | 364 | static LIST_HEAD(act_base); |
1da177e4 LT |
365 | static DEFINE_RWLOCK(act_mod_lock); |
366 | ||
ddf97ccd WC |
367 | int tcf_register_action(struct tc_action_ops *act, |
368 | struct pernet_operations *ops) | |
1da177e4 | 369 | { |
1f747c26 | 370 | struct tc_action_ops *a; |
ddf97ccd | 371 | int ret; |
1da177e4 | 372 | |
ddf97ccd | 373 | if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup) |
76c82d7a JHS |
374 | return -EINVAL; |
375 | ||
ab102b80 WC |
376 | /* We have to register pernet ops before making the action ops visible, |
377 | * otherwise tcf_action_init_1() could get a partially initialized | |
378 | * netns. | |
379 | */ | |
380 | ret = register_pernet_subsys(ops); | |
381 | if (ret) | |
382 | return ret; | |
383 | ||
1da177e4 | 384 | write_lock(&act_mod_lock); |
1f747c26 | 385 | list_for_each_entry(a, &act_base, head) { |
1da177e4 LT |
386 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { |
387 | write_unlock(&act_mod_lock); | |
ab102b80 | 388 | unregister_pernet_subsys(ops); |
1da177e4 LT |
389 | return -EEXIST; |
390 | } | |
391 | } | |
1f747c26 | 392 | list_add_tail(&act->head, &act_base); |
1da177e4 | 393 | write_unlock(&act_mod_lock); |
ddf97ccd | 394 | |
1da177e4 LT |
395 | return 0; |
396 | } | |
62e3ba1b | 397 | EXPORT_SYMBOL(tcf_register_action); |
1da177e4 | 398 | |
ddf97ccd WC |
399 | int tcf_unregister_action(struct tc_action_ops *act, |
400 | struct pernet_operations *ops) | |
1da177e4 | 401 | { |
1f747c26 | 402 | struct tc_action_ops *a; |
1da177e4 LT |
403 | int err = -ENOENT; |
404 | ||
405 | write_lock(&act_mod_lock); | |
a792866a ED |
406 | list_for_each_entry(a, &act_base, head) { |
407 | if (a == act) { | |
408 | list_del(&act->head); | |
409 | err = 0; | |
1da177e4 | 410 | break; |
a792866a | 411 | } |
1da177e4 LT |
412 | } |
413 | write_unlock(&act_mod_lock); | |
ab102b80 WC |
414 | if (!err) |
415 | unregister_pernet_subsys(ops); | |
1da177e4 LT |
416 | return err; |
417 | } | |
62e3ba1b | 418 | EXPORT_SYMBOL(tcf_unregister_action); |
1da177e4 LT |
419 | |
420 | /* lookup by name */ | |
421 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
422 | { | |
a792866a | 423 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
424 | |
425 | if (kind) { | |
426 | read_lock(&act_mod_lock); | |
1f747c26 | 427 | list_for_each_entry(a, &act_base, head) { |
1da177e4 | 428 | if (strcmp(kind, a->kind) == 0) { |
a792866a ED |
429 | if (try_module_get(a->owner)) |
430 | res = a; | |
1da177e4 LT |
431 | break; |
432 | } | |
433 | } | |
434 | read_unlock(&act_mod_lock); | |
435 | } | |
a792866a | 436 | return res; |
1da177e4 LT |
437 | } |
438 | ||
7ba699c6 PM |
439 | /* lookup by nlattr */ |
440 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) | |
1da177e4 | 441 | { |
a792866a | 442 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
443 | |
444 | if (kind) { | |
445 | read_lock(&act_mod_lock); | |
1f747c26 | 446 | list_for_each_entry(a, &act_base, head) { |
7ba699c6 | 447 | if (nla_strcmp(kind, a->kind) == 0) { |
a792866a ED |
448 | if (try_module_get(a->owner)) |
449 | res = a; | |
1da177e4 LT |
450 | break; |
451 | } | |
452 | } | |
453 | read_unlock(&act_mod_lock); | |
454 | } | |
a792866a | 455 | return res; |
1da177e4 | 456 | } |
1da177e4 | 457 | |
e0ee84de JHS |
458 | /*TCA_ACT_MAX_PRIO is 32, there count upto 32 */ |
459 | #define TCA_ACT_MAX_PRIO_MASK 0x1FF | |
22dc13c8 WC |
460 | int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, |
461 | int nr_actions, struct tcf_result *res) | |
1da177e4 | 462 | { |
22dc13c8 | 463 | int ret = -1, i; |
e0ee84de JHS |
464 | u32 jmp_prgcnt = 0; |
465 | u32 jmp_ttl = TCA_ACT_MAX_PRIO; /*matches actions per filter */ | |
1da177e4 | 466 | |
e7246e12 WB |
467 | if (skb_skip_tc_classify(skb)) |
468 | return TC_ACT_OK; | |
469 | ||
e0ee84de | 470 | restart_act_graph: |
22dc13c8 WC |
471 | for (i = 0; i < nr_actions; i++) { |
472 | const struct tc_action *a = actions[i]; | |
473 | ||
e0ee84de JHS |
474 | if (jmp_prgcnt > 0) { |
475 | jmp_prgcnt -= 1; | |
476 | continue; | |
477 | } | |
1da177e4 | 478 | repeat: |
63acd680 | 479 | ret = a->ops->act(skb, a, res); |
63acd680 JHS |
480 | if (ret == TC_ACT_REPEAT) |
481 | goto repeat; /* we need a ttl - JHS */ | |
e0ee84de | 482 | |
9da3242e | 483 | if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) { |
e0ee84de JHS |
484 | jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK; |
485 | if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) { | |
486 | /* faulty opcode, stop pipeline */ | |
487 | return TC_ACT_OK; | |
488 | } else { | |
489 | jmp_ttl -= 1; | |
490 | if (jmp_ttl > 0) | |
491 | goto restart_act_graph; | |
492 | else /* faulty graph, stop pipeline */ | |
493 | return TC_ACT_OK; | |
494 | } | |
db50514f JP |
495 | } else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) { |
496 | tcf_action_goto_chain_exec(a, res); | |
e0ee84de JHS |
497 | } |
498 | ||
63acd680 | 499 | if (ret != TC_ACT_PIPE) |
e7246e12 | 500 | break; |
1da177e4 | 501 | } |
e0ee84de | 502 | |
1da177e4 LT |
503 | return ret; |
504 | } | |
62e3ba1b | 505 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 | 506 | |
55334a5d | 507 | int tcf_action_destroy(struct list_head *actions, int bind) |
1da177e4 | 508 | { |
33be6271 | 509 | struct tc_action *a, *tmp; |
55334a5d | 510 | int ret = 0; |
1da177e4 | 511 | |
33be6271 | 512 | list_for_each_entry_safe(a, tmp, actions, list) { |
28e6b67f | 513 | ret = __tcf_hash_release(a, bind, true); |
55334a5d | 514 | if (ret == ACT_P_DELETED) |
63acd680 | 515 | module_put(a->ops->owner); |
55334a5d WC |
516 | else if (ret < 0) |
517 | return ret; | |
1da177e4 | 518 | } |
55334a5d | 519 | return ret; |
1da177e4 LT |
520 | } |
521 | ||
522 | int | |
523 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
524 | { | |
1da177e4 LT |
525 | return a->ops->dump(skb, a, bind, ref); |
526 | } | |
527 | ||
528 | int | |
529 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
530 | { | |
531 | int err = -EINVAL; | |
27a884dc | 532 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 533 | struct nlattr *nest; |
1da177e4 | 534 | |
1b34ec43 DM |
535 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) |
536 | goto nla_put_failure; | |
1da177e4 | 537 | if (tcf_action_copy_stats(skb, a, 0)) |
7ba699c6 | 538 | goto nla_put_failure; |
1045ba77 JHS |
539 | if (a->act_cookie) { |
540 | if (nla_put(skb, TCA_ACT_COOKIE, a->act_cookie->len, | |
541 | a->act_cookie->data)) | |
542 | goto nla_put_failure; | |
543 | } | |
544 | ||
4b3550ef PM |
545 | nest = nla_nest_start(skb, TCA_OPTIONS); |
546 | if (nest == NULL) | |
547 | goto nla_put_failure; | |
cc7ec456 ED |
548 | err = tcf_action_dump_old(skb, a, bind, ref); |
549 | if (err > 0) { | |
4b3550ef | 550 | nla_nest_end(skb, nest); |
1da177e4 LT |
551 | return err; |
552 | } | |
553 | ||
7ba699c6 | 554 | nla_put_failure: |
dc5fc579 | 555 | nlmsg_trim(skb, b); |
1da177e4 LT |
556 | return -1; |
557 | } | |
62e3ba1b | 558 | EXPORT_SYMBOL(tcf_action_dump_1); |
1da177e4 | 559 | |
0b0f43fe JHS |
560 | int tcf_action_dump(struct sk_buff *skb, struct list_head *actions, |
561 | int bind, int ref) | |
1da177e4 LT |
562 | { |
563 | struct tc_action *a; | |
564 | int err = -EINVAL; | |
4b3550ef | 565 | struct nlattr *nest; |
1da177e4 | 566 | |
33be6271 | 567 | list_for_each_entry(a, actions, list) { |
4b3550ef PM |
568 | nest = nla_nest_start(skb, a->order); |
569 | if (nest == NULL) | |
570 | goto nla_put_failure; | |
1da177e4 LT |
571 | err = tcf_action_dump_1(skb, a, bind, ref); |
572 | if (err < 0) | |
4fe683f5 | 573 | goto errout; |
4b3550ef | 574 | nla_nest_end(skb, nest); |
1da177e4 LT |
575 | } |
576 | ||
577 | return 0; | |
578 | ||
7ba699c6 | 579 | nla_put_failure: |
4fe683f5 TG |
580 | err = -EINVAL; |
581 | errout: | |
4b3550ef | 582 | nla_nest_cancel(skb, nest); |
4fe683f5 | 583 | return err; |
1da177e4 LT |
584 | } |
585 | ||
e0535ce5 | 586 | static struct tc_cookie *nla_memdup_cookie(struct nlattr **tb) |
1045ba77 | 587 | { |
e0535ce5 WB |
588 | struct tc_cookie *c = kzalloc(sizeof(*c), GFP_KERNEL); |
589 | if (!c) | |
590 | return NULL; | |
591 | ||
592 | c->data = nla_memdup(tb[TCA_ACT_COOKIE], GFP_KERNEL); | |
593 | if (!c->data) { | |
594 | kfree(c); | |
595 | return NULL; | |
1045ba77 | 596 | } |
e0535ce5 | 597 | c->len = nla_len(tb[TCA_ACT_COOKIE]); |
1045ba77 | 598 | |
e0535ce5 | 599 | return c; |
1045ba77 JHS |
600 | } |
601 | ||
9fb9f251 JP |
602 | struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, |
603 | struct nlattr *nla, struct nlattr *est, | |
604 | char *name, int ovr, int bind) | |
1da177e4 LT |
605 | { |
606 | struct tc_action *a; | |
607 | struct tc_action_ops *a_o; | |
e0535ce5 | 608 | struct tc_cookie *cookie = NULL; |
1da177e4 | 609 | char act_name[IFNAMSIZ]; |
cc7ec456 | 610 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 611 | struct nlattr *kind; |
ab27cfb8 | 612 | int err; |
1da177e4 | 613 | |
1da177e4 | 614 | if (name == NULL) { |
fceb6435 | 615 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL); |
cee63723 | 616 | if (err < 0) |
1da177e4 | 617 | goto err_out; |
cee63723 | 618 | err = -EINVAL; |
7ba699c6 | 619 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
620 | if (kind == NULL) |
621 | goto err_out; | |
7ba699c6 | 622 | if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) |
1da177e4 | 623 | goto err_out; |
e0535ce5 WB |
624 | if (tb[TCA_ACT_COOKIE]) { |
625 | int cklen = nla_len(tb[TCA_ACT_COOKIE]); | |
626 | ||
627 | if (cklen > TC_COOKIE_MAX_SIZE) | |
628 | goto err_out; | |
629 | ||
630 | cookie = nla_memdup_cookie(tb); | |
631 | if (!cookie) { | |
632 | err = -ENOMEM; | |
633 | goto err_out; | |
634 | } | |
635 | } | |
1da177e4 | 636 | } else { |
cee63723 | 637 | err = -EINVAL; |
1da177e4 LT |
638 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) |
639 | goto err_out; | |
640 | } | |
641 | ||
642 | a_o = tc_lookup_action_n(act_name); | |
643 | if (a_o == NULL) { | |
95a5afca | 644 | #ifdef CONFIG_MODULES |
1da177e4 | 645 | rtnl_unlock(); |
4bba3925 | 646 | request_module("act_%s", act_name); |
1da177e4 LT |
647 | rtnl_lock(); |
648 | ||
649 | a_o = tc_lookup_action_n(act_name); | |
650 | ||
651 | /* We dropped the RTNL semaphore in order to | |
652 | * perform the module load. So, even if we | |
653 | * succeeded in loading the module we have to | |
654 | * tell the caller to replay the request. We | |
655 | * indicate this using -EAGAIN. | |
656 | */ | |
657 | if (a_o != NULL) { | |
ab27cfb8 | 658 | err = -EAGAIN; |
1da177e4 LT |
659 | goto err_mod; |
660 | } | |
661 | #endif | |
ab27cfb8 | 662 | err = -ENOENT; |
1da177e4 LT |
663 | goto err_out; |
664 | } | |
665 | ||
1da177e4 LT |
666 | /* backward compatibility for policer */ |
667 | if (name == NULL) | |
a85a970a | 668 | err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, ovr, bind); |
1da177e4 | 669 | else |
a85a970a | 670 | err = a_o->init(net, nla, est, &a, ovr, bind); |
ab27cfb8 | 671 | if (err < 0) |
a85a970a | 672 | goto err_mod; |
1da177e4 | 673 | |
e0535ce5 WB |
674 | if (name == NULL && tb[TCA_ACT_COOKIE]) { |
675 | if (a->act_cookie) { | |
676 | kfree(a->act_cookie->data); | |
677 | kfree(a->act_cookie); | |
1045ba77 | 678 | } |
e0535ce5 | 679 | a->act_cookie = cookie; |
1045ba77 JHS |
680 | } |
681 | ||
1da177e4 | 682 | /* module count goes up only when brand new policy is created |
cc7ec456 ED |
683 | * if it exists and is only bound to in a_o->init() then |
684 | * ACT_P_CREATED is not returned (a zero is). | |
685 | */ | |
ab27cfb8 | 686 | if (err != ACT_P_CREATED) |
1da177e4 | 687 | module_put(a_o->owner); |
1da177e4 | 688 | |
db50514f JP |
689 | if (TC_ACT_EXT_CMP(a->tcfa_action, TC_ACT_GOTO_CHAIN)) { |
690 | err = tcf_action_goto_chain_init(a, tp); | |
691 | if (err) { | |
692 | LIST_HEAD(actions); | |
693 | ||
694 | list_add_tail(&a->list, &actions); | |
695 | tcf_action_destroy(&actions, bind); | |
696 | return ERR_PTR(err); | |
697 | } | |
698 | } | |
699 | ||
1da177e4 LT |
700 | return a; |
701 | ||
1da177e4 LT |
702 | err_mod: |
703 | module_put(a_o->owner); | |
704 | err_out: | |
e0535ce5 WB |
705 | if (cookie) { |
706 | kfree(cookie->data); | |
707 | kfree(cookie); | |
708 | } | |
ab27cfb8 | 709 | return ERR_PTR(err); |
1da177e4 LT |
710 | } |
711 | ||
aecc5cef JHS |
712 | static void cleanup_a(struct list_head *actions, int ovr) |
713 | { | |
714 | struct tc_action *a; | |
715 | ||
716 | if (!ovr) | |
717 | return; | |
718 | ||
719 | list_for_each_entry(a, actions, list) | |
720 | a->tcfa_refcnt--; | |
721 | } | |
722 | ||
9fb9f251 JP |
723 | int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, |
724 | struct nlattr *est, char *name, int ovr, int bind, | |
725 | struct list_head *actions) | |
1da177e4 | 726 | { |
cc7ec456 | 727 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 | 728 | struct tc_action *act; |
cee63723 | 729 | int err; |
1da177e4 LT |
730 | int i; |
731 | ||
fceb6435 | 732 | err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, NULL); |
cee63723 | 733 | if (err < 0) |
33be6271 | 734 | return err; |
1da177e4 | 735 | |
7ba699c6 | 736 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
9fb9f251 | 737 | act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind); |
33be6271 WC |
738 | if (IS_ERR(act)) { |
739 | err = PTR_ERR(act); | |
1da177e4 | 740 | goto err; |
33be6271 | 741 | } |
7ba699c6 | 742 | act->order = i; |
aecc5cef JHS |
743 | if (ovr) |
744 | act->tcfa_refcnt++; | |
33be6271 | 745 | list_add_tail(&act->list, actions); |
1da177e4 | 746 | } |
aecc5cef JHS |
747 | |
748 | /* Remove the temp refcnt which was necessary to protect against | |
749 | * destroying an existing action which was being replaced | |
750 | */ | |
751 | cleanup_a(actions, ovr); | |
33be6271 | 752 | return 0; |
1da177e4 LT |
753 | |
754 | err: | |
33be6271 WC |
755 | tcf_action_destroy(actions, bind); |
756 | return err; | |
1da177e4 LT |
757 | } |
758 | ||
ec0595cc | 759 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p, |
1da177e4 LT |
760 | int compat_mode) |
761 | { | |
762 | int err = 0; | |
763 | struct gnet_dump d; | |
10297b99 | 764 | |
7eb8896d | 765 | if (p == NULL) |
1da177e4 LT |
766 | goto errout; |
767 | ||
768 | /* compat_mode being true specifies a call that is supposed | |
06fe9fb4 | 769 | * to add additional backward compatibility statistic TLVs. |
1da177e4 LT |
770 | */ |
771 | if (compat_mode) { | |
ec0595cc | 772 | if (p->type == TCA_OLD_COMPAT) |
1da177e4 | 773 | err = gnet_stats_start_copy_compat(skb, 0, |
9854518e ND |
774 | TCA_STATS, |
775 | TCA_XSTATS, | |
ec0595cc | 776 | &p->tcfa_lock, &d, |
9854518e | 777 | TCA_PAD); |
1da177e4 LT |
778 | else |
779 | return 0; | |
780 | } else | |
781 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
ec0595cc | 782 | &p->tcfa_lock, &d, TCA_ACT_PAD); |
1da177e4 LT |
783 | |
784 | if (err < 0) | |
785 | goto errout; | |
786 | ||
ec0595cc | 787 | if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 || |
1c0d32fd | 788 | gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 || |
519c818e | 789 | gnet_stats_copy_queue(&d, p->cpu_qstats, |
ec0595cc WC |
790 | &p->tcfa_qstats, |
791 | p->tcfa_qstats.qlen) < 0) | |
1da177e4 LT |
792 | goto errout; |
793 | ||
794 | if (gnet_stats_finish_copy(&d) < 0) | |
795 | goto errout; | |
796 | ||
797 | return 0; | |
798 | ||
799 | errout: | |
800 | return -1; | |
801 | } | |
802 | ||
0b0f43fe JHS |
803 | static int tca_get_fill(struct sk_buff *skb, struct list_head *actions, |
804 | u32 portid, u32 seq, u16 flags, int event, int bind, | |
805 | int ref) | |
1da177e4 LT |
806 | { |
807 | struct tcamsg *t; | |
808 | struct nlmsghdr *nlh; | |
27a884dc | 809 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 810 | struct nlattr *nest; |
1da177e4 | 811 | |
15e47304 | 812 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags); |
8b00a53c DM |
813 | if (!nlh) |
814 | goto out_nlmsg_trim; | |
815 | t = nlmsg_data(nlh); | |
1da177e4 | 816 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
817 | t->tca__pad1 = 0; |
818 | t->tca__pad2 = 0; | |
10297b99 | 819 | |
4b3550ef PM |
820 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
821 | if (nest == NULL) | |
8b00a53c | 822 | goto out_nlmsg_trim; |
1da177e4 | 823 | |
33be6271 | 824 | if (tcf_action_dump(skb, actions, bind, ref) < 0) |
8b00a53c | 825 | goto out_nlmsg_trim; |
1da177e4 | 826 | |
4b3550ef | 827 | nla_nest_end(skb, nest); |
10297b99 | 828 | |
27a884dc | 829 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
830 | return skb->len; |
831 | ||
8b00a53c | 832 | out_nlmsg_trim: |
dc5fc579 | 833 | nlmsg_trim(skb, b); |
1da177e4 LT |
834 | return -1; |
835 | } | |
836 | ||
837 | static int | |
15e47304 | 838 | act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n, |
33be6271 | 839 | struct list_head *actions, int event) |
1da177e4 LT |
840 | { |
841 | struct sk_buff *skb; | |
1da177e4 LT |
842 | |
843 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
844 | if (!skb) | |
845 | return -ENOBUFS; | |
0b0f43fe JHS |
846 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, |
847 | 0, 0) <= 0) { | |
1da177e4 LT |
848 | kfree_skb(skb); |
849 | return -EINVAL; | |
850 | } | |
2942e900 | 851 | |
15e47304 | 852 | return rtnl_unicast(skb, net, portid); |
1da177e4 LT |
853 | } |
854 | ||
ddf97ccd WC |
855 | static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla, |
856 | struct nlmsghdr *n, u32 portid) | |
1da177e4 | 857 | { |
cc7ec456 | 858 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
a85a970a | 859 | const struct tc_action_ops *ops; |
1da177e4 LT |
860 | struct tc_action *a; |
861 | int index; | |
ab27cfb8 | 862 | int err; |
1da177e4 | 863 | |
fceb6435 | 864 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL); |
cee63723 | 865 | if (err < 0) |
ab27cfb8 | 866 | goto err_out; |
1da177e4 | 867 | |
cee63723 | 868 | err = -EINVAL; |
7ba699c6 PM |
869 | if (tb[TCA_ACT_INDEX] == NULL || |
870 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) | |
ab27cfb8 | 871 | goto err_out; |
1587bac4 | 872 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 873 | |
ab27cfb8 | 874 | err = -EINVAL; |
a85a970a WC |
875 | ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
876 | if (!ops) /* could happen in batch of actions */ | |
877 | goto err_out; | |
ab27cfb8 | 878 | err = -ENOENT; |
a85a970a | 879 | if (ops->lookup(net, &a, index) == 0) |
1da177e4 LT |
880 | goto err_mod; |
881 | ||
a85a970a | 882 | module_put(ops->owner); |
1da177e4 | 883 | return a; |
ab27cfb8 | 884 | |
1da177e4 | 885 | err_mod: |
a85a970a | 886 | module_put(ops->owner); |
ab27cfb8 PM |
887 | err_out: |
888 | return ERR_PTR(err); | |
1da177e4 LT |
889 | } |
890 | ||
7316ae88 | 891 | static int tca_action_flush(struct net *net, struct nlattr *nla, |
15e47304 | 892 | struct nlmsghdr *n, u32 portid) |
1da177e4 LT |
893 | { |
894 | struct sk_buff *skb; | |
895 | unsigned char *b; | |
896 | struct nlmsghdr *nlh; | |
897 | struct tcamsg *t; | |
898 | struct netlink_callback dcb; | |
4b3550ef | 899 | struct nlattr *nest; |
cc7ec456 | 900 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
a85a970a | 901 | const struct tc_action_ops *ops; |
7ba699c6 | 902 | struct nlattr *kind; |
36723873 | 903 | int err = -ENOMEM; |
1da177e4 | 904 | |
1da177e4 LT |
905 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
906 | if (!skb) { | |
6ff9c364 | 907 | pr_debug("tca_action_flush: failed skb alloc\n"); |
36723873 | 908 | return err; |
1da177e4 LT |
909 | } |
910 | ||
27a884dc | 911 | b = skb_tail_pointer(skb); |
1da177e4 | 912 | |
fceb6435 | 913 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL, NULL); |
cee63723 | 914 | if (err < 0) |
1da177e4 LT |
915 | goto err_out; |
916 | ||
cee63723 | 917 | err = -EINVAL; |
7ba699c6 | 918 | kind = tb[TCA_ACT_KIND]; |
a85a970a WC |
919 | ops = tc_lookup_action(kind); |
920 | if (!ops) /*some idjot trying to flush unknown action */ | |
1da177e4 LT |
921 | goto err_out; |
922 | ||
0b0f43fe JHS |
923 | nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, |
924 | sizeof(*t), 0); | |
8b00a53c DM |
925 | if (!nlh) |
926 | goto out_module_put; | |
927 | t = nlmsg_data(nlh); | |
1da177e4 | 928 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
929 | t->tca__pad1 = 0; |
930 | t->tca__pad2 = 0; | |
1da177e4 | 931 | |
4b3550ef PM |
932 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
933 | if (nest == NULL) | |
8b00a53c | 934 | goto out_module_put; |
1da177e4 | 935 | |
a85a970a | 936 | err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops); |
edb9d1bf | 937 | if (err <= 0) |
8b00a53c | 938 | goto out_module_put; |
1da177e4 | 939 | |
4b3550ef | 940 | nla_nest_end(skb, nest); |
1da177e4 | 941 | |
27a884dc | 942 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 | 943 | nlh->nlmsg_flags |= NLM_F_ROOT; |
a85a970a | 944 | module_put(ops->owner); |
15e47304 | 945 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 946 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
947 | if (err > 0) |
948 | return 0; | |
949 | ||
950 | return err; | |
951 | ||
8b00a53c | 952 | out_module_put: |
a85a970a | 953 | module_put(ops->owner); |
1da177e4 LT |
954 | err_out: |
955 | kfree_skb(skb); | |
1da177e4 LT |
956 | return err; |
957 | } | |
958 | ||
a56e1953 WC |
959 | static int |
960 | tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions, | |
961 | u32 portid) | |
962 | { | |
963 | int ret; | |
964 | struct sk_buff *skb; | |
965 | ||
966 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
967 | if (!skb) | |
968 | return -ENOBUFS; | |
969 | ||
970 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION, | |
971 | 0, 1) <= 0) { | |
972 | kfree_skb(skb); | |
973 | return -EINVAL; | |
974 | } | |
975 | ||
976 | /* now do the delete */ | |
55334a5d WC |
977 | ret = tcf_action_destroy(actions, 0); |
978 | if (ret < 0) { | |
979 | kfree_skb(skb); | |
980 | return ret; | |
981 | } | |
a56e1953 WC |
982 | |
983 | ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
984 | n->nlmsg_flags & NLM_F_ECHO); | |
985 | if (ret > 0) | |
986 | return 0; | |
987 | return ret; | |
988 | } | |
989 | ||
1da177e4 | 990 | static int |
7316ae88 | 991 | tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
15e47304 | 992 | u32 portid, int event) |
1da177e4 | 993 | { |
cee63723 | 994 | int i, ret; |
cc7ec456 | 995 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 WC |
996 | struct tc_action *act; |
997 | LIST_HEAD(actions); | |
1da177e4 | 998 | |
fceb6435 | 999 | ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL, NULL); |
cee63723 PM |
1000 | if (ret < 0) |
1001 | return ret; | |
1da177e4 | 1002 | |
cc7ec456 | 1003 | if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) { |
f97017cd | 1004 | if (tb[1] != NULL) |
15e47304 | 1005 | return tca_action_flush(net, tb[1], n, portid); |
f97017cd JHS |
1006 | else |
1007 | return -EINVAL; | |
1da177e4 LT |
1008 | } |
1009 | ||
7ba699c6 | 1010 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
ddf97ccd | 1011 | act = tcf_action_get_1(net, tb[i], n, portid); |
ab27cfb8 PM |
1012 | if (IS_ERR(act)) { |
1013 | ret = PTR_ERR(act); | |
1da177e4 | 1014 | goto err; |
ab27cfb8 | 1015 | } |
7ba699c6 | 1016 | act->order = i; |
33be6271 | 1017 | list_add_tail(&act->list, &actions); |
1da177e4 LT |
1018 | } |
1019 | ||
1020 | if (event == RTM_GETACTION) | |
33be6271 | 1021 | ret = act_get_notify(net, portid, n, &actions, event); |
1da177e4 | 1022 | else { /* delete */ |
a56e1953 WC |
1023 | ret = tcf_del_notify(net, n, &actions, portid); |
1024 | if (ret) | |
1da177e4 | 1025 | goto err; |
1da177e4 LT |
1026 | return ret; |
1027 | } | |
1028 | err: | |
0faa9cb5 JHS |
1029 | if (event != RTM_GETACTION) |
1030 | tcf_action_destroy(&actions, 0); | |
1da177e4 LT |
1031 | return ret; |
1032 | } | |
1033 | ||
a56e1953 WC |
1034 | static int |
1035 | tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions, | |
1036 | u32 portid) | |
1da177e4 | 1037 | { |
1da177e4 | 1038 | struct sk_buff *skb; |
1da177e4 LT |
1039 | int err = 0; |
1040 | ||
1041 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1042 | if (!skb) | |
1043 | return -ENOBUFS; | |
1044 | ||
a56e1953 WC |
1045 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags, |
1046 | RTM_NEWACTION, 0, 0) <= 0) { | |
1047 | kfree_skb(skb); | |
1048 | return -EINVAL; | |
1049 | } | |
10297b99 | 1050 | |
a56e1953 WC |
1051 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
1052 | n->nlmsg_flags & NLM_F_ECHO); | |
1da177e4 LT |
1053 | if (err > 0) |
1054 | err = 0; | |
1055 | return err; | |
1da177e4 LT |
1056 | } |
1057 | ||
5a7a5555 JHS |
1058 | static int tcf_action_add(struct net *net, struct nlattr *nla, |
1059 | struct nlmsghdr *n, u32 portid, int ovr) | |
1da177e4 LT |
1060 | { |
1061 | int ret = 0; | |
33be6271 | 1062 | LIST_HEAD(actions); |
1da177e4 | 1063 | |
9fb9f251 | 1064 | ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0, &actions); |
33be6271 | 1065 | if (ret) |
f07fed82 | 1066 | return ret; |
1da177e4 | 1067 | |
f07fed82 | 1068 | return tcf_add_notify(net, n, &actions, portid); |
1da177e4 LT |
1069 | } |
1070 | ||
c21ef3e3 DA |
1071 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, |
1072 | struct netlink_ext_ack *extack) | |
1da177e4 | 1073 | { |
3b1e0a65 | 1074 | struct net *net = sock_net(skb->sk); |
7ba699c6 | 1075 | struct nlattr *tca[TCA_ACT_MAX + 1]; |
15e47304 | 1076 | u32 portid = skb ? NETLINK_CB(skb).portid : 0; |
1da177e4 LT |
1077 | int ret = 0, ovr = 0; |
1078 | ||
0b0f43fe JHS |
1079 | if ((n->nlmsg_type != RTM_GETACTION) && |
1080 | !netlink_capable(skb, CAP_NET_ADMIN)) | |
dfc47ef8 EB |
1081 | return -EPERM; |
1082 | ||
fceb6435 | 1083 | ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL, |
c21ef3e3 | 1084 | extack); |
7ba699c6 PM |
1085 | if (ret < 0) |
1086 | return ret; | |
1087 | ||
1088 | if (tca[TCA_ACT_TAB] == NULL) { | |
6ff9c364 | 1089 | pr_notice("tc_ctl_action: received NO action attribs\n"); |
1da177e4 LT |
1090 | return -EINVAL; |
1091 | } | |
1092 | ||
cc7ec456 | 1093 | /* n->nlmsg_flags & NLM_F_CREATE */ |
1da177e4 LT |
1094 | switch (n->nlmsg_type) { |
1095 | case RTM_NEWACTION: | |
1096 | /* we are going to assume all other flags | |
25985edc | 1097 | * imply create only if it doesn't exist |
1da177e4 LT |
1098 | * Note that CREATE | EXCL implies that |
1099 | * but since we want avoid ambiguity (eg when flags | |
1100 | * is zero) then just set this | |
1101 | */ | |
cc7ec456 | 1102 | if (n->nlmsg_flags & NLM_F_REPLACE) |
1da177e4 LT |
1103 | ovr = 1; |
1104 | replay: | |
15e47304 | 1105 | ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr); |
1da177e4 LT |
1106 | if (ret == -EAGAIN) |
1107 | goto replay; | |
1108 | break; | |
1109 | case RTM_DELACTION: | |
7316ae88 | 1110 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
15e47304 | 1111 | portid, RTM_DELACTION); |
1da177e4 LT |
1112 | break; |
1113 | case RTM_GETACTION: | |
7316ae88 | 1114 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
15e47304 | 1115 | portid, RTM_GETACTION); |
1da177e4 LT |
1116 | break; |
1117 | default: | |
1118 | BUG(); | |
1119 | } | |
1120 | ||
1121 | return ret; | |
1122 | } | |
1123 | ||
5a7a5555 | 1124 | static struct nlattr *find_dump_kind(const struct nlmsghdr *n) |
1da177e4 | 1125 | { |
cc7ec456 | 1126 | struct nlattr *tb1, *tb2[TCA_ACT_MAX + 1]; |
7ba699c6 PM |
1127 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
1128 | struct nlattr *nla[TCAA_MAX + 1]; | |
1129 | struct nlattr *kind; | |
1da177e4 | 1130 | |
fceb6435 JB |
1131 | if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, |
1132 | NULL, NULL) < 0) | |
1da177e4 | 1133 | return NULL; |
7ba699c6 | 1134 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
1135 | if (tb1 == NULL) |
1136 | return NULL; | |
1137 | ||
7ba699c6 | 1138 | if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), |
fceb6435 | 1139 | NLMSG_ALIGN(nla_len(tb1)), NULL, NULL) < 0) |
1da177e4 | 1140 | return NULL; |
1da177e4 | 1141 | |
6d834e04 PM |
1142 | if (tb[1] == NULL) |
1143 | return NULL; | |
fceb6435 | 1144 | if (nla_parse_nested(tb2, TCA_ACT_MAX, tb[1], NULL, NULL) < 0) |
1da177e4 | 1145 | return NULL; |
7ba699c6 | 1146 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 1147 | |
26dab893 | 1148 | return kind; |
1da177e4 LT |
1149 | } |
1150 | ||
5a7a5555 | 1151 | static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 1152 | { |
ddf97ccd | 1153 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1154 | struct nlmsghdr *nlh; |
27a884dc | 1155 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1156 | struct nlattr *nest; |
1da177e4 | 1157 | struct tc_action_ops *a_o; |
1da177e4 | 1158 | int ret = 0; |
8b00a53c | 1159 | struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh); |
7ba699c6 | 1160 | struct nlattr *kind = find_dump_kind(cb->nlh); |
1da177e4 LT |
1161 | |
1162 | if (kind == NULL) { | |
6ff9c364 | 1163 | pr_info("tc_dump_action: action bad kind\n"); |
1da177e4 LT |
1164 | return 0; |
1165 | } | |
1166 | ||
26dab893 | 1167 | a_o = tc_lookup_action(kind); |
cc7ec456 | 1168 | if (a_o == NULL) |
1da177e4 | 1169 | return 0; |
1da177e4 | 1170 | |
15e47304 | 1171 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
8b00a53c DM |
1172 | cb->nlh->nlmsg_type, sizeof(*t), 0); |
1173 | if (!nlh) | |
1174 | goto out_module_put; | |
1175 | t = nlmsg_data(nlh); | |
1da177e4 | 1176 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1177 | t->tca__pad1 = 0; |
1178 | t->tca__pad2 = 0; | |
1da177e4 | 1179 | |
4b3550ef PM |
1180 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
1181 | if (nest == NULL) | |
8b00a53c | 1182 | goto out_module_put; |
1da177e4 | 1183 | |
a85a970a | 1184 | ret = a_o->walk(net, skb, cb, RTM_GETACTION, a_o); |
1da177e4 | 1185 | if (ret < 0) |
8b00a53c | 1186 | goto out_module_put; |
1da177e4 LT |
1187 | |
1188 | if (ret > 0) { | |
4b3550ef | 1189 | nla_nest_end(skb, nest); |
1da177e4 LT |
1190 | ret = skb->len; |
1191 | } else | |
ebecaa66 | 1192 | nlmsg_trim(skb, b); |
1da177e4 | 1193 | |
27a884dc | 1194 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
15e47304 | 1195 | if (NETLINK_CB(cb->skb).portid && ret) |
1da177e4 LT |
1196 | nlh->nlmsg_flags |= NLM_F_MULTI; |
1197 | module_put(a_o->owner); | |
1198 | return skb->len; | |
1199 | ||
8b00a53c | 1200 | out_module_put: |
1da177e4 | 1201 | module_put(a_o->owner); |
dc5fc579 | 1202 | nlmsg_trim(skb, b); |
1da177e4 LT |
1203 | return skb->len; |
1204 | } | |
1205 | ||
1206 | static int __init tc_action_init(void) | |
1207 | { | |
c7ac8679 GR |
1208 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL); |
1209 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL); | |
1210 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, | |
1211 | NULL); | |
1da177e4 | 1212 | |
1da177e4 LT |
1213 | return 0; |
1214 | } | |
1215 | ||
1216 | subsys_initcall(tc_action_init); |