Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * net/sched/act_api.c Packet action API. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Author: Jamal Hadi Salim | |
10 | * | |
11 | * | |
12 | */ | |
13 | ||
1da177e4 LT |
14 | #include <linux/types.h> |
15 | #include <linux/kernel.h> | |
1da177e4 | 16 | #include <linux/string.h> |
1da177e4 | 17 | #include <linux/errno.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
1da177e4 | 19 | #include <linux/skbuff.h> |
1da177e4 LT |
20 | #include <linux/init.h> |
21 | #include <linux/kmod.h> | |
ab27cfb8 | 22 | #include <linux/err.h> |
3a9a231d | 23 | #include <linux/module.h> |
b854272b DL |
24 | #include <net/net_namespace.h> |
25 | #include <net/sock.h> | |
1da177e4 LT |
26 | #include <net/sch_generic.h> |
27 | #include <net/act_api.h> | |
dc5fc579 | 28 | #include <net/netlink.h> |
1da177e4 | 29 | |
519c818e ED |
30 | static void free_tcf(struct rcu_head *head) |
31 | { | |
32 | struct tcf_common *p = container_of(head, struct tcf_common, tcfc_rcu); | |
33 | ||
34 | free_percpu(p->cpu_bstats); | |
35 | free_percpu(p->cpu_qstats); | |
36 | kfree(p); | |
37 | } | |
38 | ||
ddf97ccd | 39 | static void tcf_hash_destroy(struct tcf_hashinfo *hinfo, struct tc_action *a) |
e9ce1cd3 | 40 | { |
86062033 | 41 | struct tcf_common *p = a->priv; |
86062033 | 42 | |
89819dc0 WC |
43 | spin_lock_bh(&hinfo->lock); |
44 | hlist_del(&p->tcfc_head); | |
45 | spin_unlock_bh(&hinfo->lock); | |
46 | gen_kill_estimator(&p->tcfc_bstats, | |
47 | &p->tcfc_rate_est); | |
48 | /* | |
49 | * gen_estimator est_timer() might access p->tcfc_lock | |
50 | * or bstats, wait a RCU grace period before freeing p | |
51 | */ | |
519c818e | 52 | call_rcu(&p->tcfc_rcu, free_tcf); |
e9ce1cd3 | 53 | } |
e9ce1cd3 | 54 | |
28e6b67f | 55 | int __tcf_hash_release(struct tc_action *a, bool bind, bool strict) |
e9ce1cd3 | 56 | { |
86062033 | 57 | struct tcf_common *p = a->priv; |
e9ce1cd3 DM |
58 | int ret = 0; |
59 | ||
60 | if (p) { | |
61 | if (bind) | |
62 | p->tcfc_bindcnt--; | |
28e6b67f | 63 | else if (strict && p->tcfc_bindcnt > 0) |
55334a5d | 64 | return -EPERM; |
e9ce1cd3 DM |
65 | |
66 | p->tcfc_refcnt--; | |
10297b99 | 67 | if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) { |
a5b5c958 WC |
68 | if (a->ops->cleanup) |
69 | a->ops->cleanup(a, bind); | |
ddf97ccd | 70 | tcf_hash_destroy(a->hinfo, a); |
1d4150c0 | 71 | ret = ACT_P_DELETED; |
e9ce1cd3 DM |
72 | } |
73 | } | |
28e6b67f | 74 | |
e9ce1cd3 DM |
75 | return ret; |
76 | } | |
28e6b67f | 77 | EXPORT_SYMBOL(__tcf_hash_release); |
e9ce1cd3 | 78 | |
ddf97ccd WC |
79 | static int tcf_dump_walker(struct tcf_hashinfo *hinfo, struct sk_buff *skb, |
80 | struct netlink_callback *cb, struct tc_action *a) | |
e9ce1cd3 | 81 | { |
89819dc0 | 82 | struct hlist_head *head; |
e9ce1cd3 | 83 | struct tcf_common *p; |
cc7ec456 | 84 | int err = 0, index = -1, i = 0, s_i = 0, n_i = 0; |
4b3550ef | 85 | struct nlattr *nest; |
e9ce1cd3 | 86 | |
89819dc0 | 87 | spin_lock_bh(&hinfo->lock); |
e9ce1cd3 DM |
88 | |
89 | s_i = cb->args[0]; | |
90 | ||
91 | for (i = 0; i < (hinfo->hmask + 1); i++) { | |
89819dc0 | 92 | head = &hinfo->htab[tcf_hash(i, hinfo->hmask)]; |
e9ce1cd3 | 93 | |
89819dc0 | 94 | hlist_for_each_entry_rcu(p, head, tcfc_head) { |
e9ce1cd3 DM |
95 | index++; |
96 | if (index < s_i) | |
97 | continue; | |
98 | a->priv = p; | |
99 | a->order = n_i; | |
4b3550ef PM |
100 | |
101 | nest = nla_nest_start(skb, a->order); | |
102 | if (nest == NULL) | |
103 | goto nla_put_failure; | |
e9ce1cd3 DM |
104 | err = tcf_action_dump_1(skb, a, 0, 0); |
105 | if (err < 0) { | |
106 | index--; | |
4b3550ef | 107 | nlmsg_trim(skb, nest); |
e9ce1cd3 DM |
108 | goto done; |
109 | } | |
4b3550ef | 110 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
111 | n_i++; |
112 | if (n_i >= TCA_ACT_MAX_PRIO) | |
113 | goto done; | |
114 | } | |
115 | } | |
116 | done: | |
89819dc0 | 117 | spin_unlock_bh(&hinfo->lock); |
e9ce1cd3 DM |
118 | if (n_i) |
119 | cb->args[0] += n_i; | |
120 | return n_i; | |
121 | ||
7ba699c6 | 122 | nla_put_failure: |
4b3550ef | 123 | nla_nest_cancel(skb, nest); |
e9ce1cd3 DM |
124 | goto done; |
125 | } | |
126 | ||
ddf97ccd WC |
127 | static int tcf_del_walker(struct tcf_hashinfo *hinfo, struct sk_buff *skb, |
128 | struct tc_action *a) | |
e9ce1cd3 | 129 | { |
89819dc0 WC |
130 | struct hlist_head *head; |
131 | struct hlist_node *n; | |
132 | struct tcf_common *p; | |
4b3550ef | 133 | struct nlattr *nest; |
cc7ec456 | 134 | int i = 0, n_i = 0; |
55334a5d | 135 | int ret = -EINVAL; |
e9ce1cd3 | 136 | |
4b3550ef PM |
137 | nest = nla_nest_start(skb, a->order); |
138 | if (nest == NULL) | |
139 | goto nla_put_failure; | |
1b34ec43 DM |
140 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) |
141 | goto nla_put_failure; | |
e9ce1cd3 | 142 | for (i = 0; i < (hinfo->hmask + 1); i++) { |
89819dc0 WC |
143 | head = &hinfo->htab[tcf_hash(i, hinfo->hmask)]; |
144 | hlist_for_each_entry_safe(p, n, head, tcfc_head) { | |
86062033 | 145 | a->priv = p; |
28e6b67f | 146 | ret = __tcf_hash_release(a, false, true); |
55334a5d | 147 | if (ret == ACT_P_DELETED) { |
cc7ec456 | 148 | module_put(a->ops->owner); |
805c1f4a | 149 | n_i++; |
55334a5d WC |
150 | } else if (ret < 0) |
151 | goto nla_put_failure; | |
e9ce1cd3 DM |
152 | } |
153 | } | |
1b34ec43 DM |
154 | if (nla_put_u32(skb, TCA_FCNT, n_i)) |
155 | goto nla_put_failure; | |
4b3550ef | 156 | nla_nest_end(skb, nest); |
e9ce1cd3 DM |
157 | |
158 | return n_i; | |
7ba699c6 | 159 | nla_put_failure: |
4b3550ef | 160 | nla_nest_cancel(skb, nest); |
55334a5d | 161 | return ret; |
e9ce1cd3 DM |
162 | } |
163 | ||
ddf97ccd WC |
164 | int tcf_generic_walker(struct tc_action_net *tn, struct sk_buff *skb, |
165 | struct netlink_callback *cb, int type, | |
166 | struct tc_action *a) | |
e9ce1cd3 | 167 | { |
ddf97ccd WC |
168 | struct tcf_hashinfo *hinfo = tn->hinfo; |
169 | ||
170 | a->hinfo = hinfo; | |
171 | ||
e9ce1cd3 | 172 | if (type == RTM_DELACTION) { |
ddf97ccd | 173 | return tcf_del_walker(hinfo, skb, a); |
e9ce1cd3 | 174 | } else if (type == RTM_GETACTION) { |
ddf97ccd | 175 | return tcf_dump_walker(hinfo, skb, cb, a); |
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 | |
6e6a50c2 | 183 | static struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo) |
e9ce1cd3 | 184 | { |
89819dc0 WC |
185 | struct tcf_common *p = NULL; |
186 | struct hlist_head *head; | |
e9ce1cd3 | 187 | |
89819dc0 WC |
188 | spin_lock_bh(&hinfo->lock); |
189 | head = &hinfo->htab[tcf_hash(index, hinfo->hmask)]; | |
190 | hlist_for_each_entry_rcu(p, head, tcfc_head) | |
e9ce1cd3 DM |
191 | if (p->tcfc_index == index) |
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 | ||
ddf97ccd | 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; |
e9ce1cd3 DM |
216 | struct tcf_common *p = tcf_hash_lookup(index, hinfo); |
217 | ||
218 | if (p) { | |
219 | a->priv = p; | |
ddf97ccd | 220 | a->hinfo = hinfo; |
e9ce1cd3 DM |
221 | return 1; |
222 | } | |
223 | return 0; | |
224 | } | |
6e6a50c2 | 225 | EXPORT_SYMBOL(tcf_hash_search); |
e9ce1cd3 | 226 | |
ddf97ccd WC |
227 | int tcf_hash_check(struct tc_action_net *tn, u32 index, struct tc_action *a, |
228 | int bind) | |
e9ce1cd3 | 229 | { |
ddf97ccd | 230 | struct tcf_hashinfo *hinfo = tn->hinfo; |
e9ce1cd3 DM |
231 | struct tcf_common *p = NULL; |
232 | if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) { | |
76aab2c1 | 233 | if (bind) |
e9ce1cd3 | 234 | p->tcfc_bindcnt++; |
76aab2c1 | 235 | p->tcfc_refcnt++; |
e9ce1cd3 | 236 | a->priv = p; |
ddf97ccd | 237 | a->hinfo = hinfo; |
86062033 | 238 | return 1; |
e9ce1cd3 | 239 | } |
86062033 | 240 | return 0; |
e9ce1cd3 DM |
241 | } |
242 | EXPORT_SYMBOL(tcf_hash_check); | |
243 | ||
86062033 WC |
244 | void tcf_hash_cleanup(struct tc_action *a, struct nlattr *est) |
245 | { | |
246 | struct tcf_common *pc = a->priv; | |
247 | if (est) | |
248 | gen_kill_estimator(&pc->tcfc_bstats, | |
249 | &pc->tcfc_rate_est); | |
519c818e | 250 | call_rcu(&pc->tcfc_rcu, free_tcf); |
86062033 WC |
251 | } |
252 | EXPORT_SYMBOL(tcf_hash_cleanup); | |
253 | ||
ddf97ccd WC |
254 | int tcf_hash_create(struct tc_action_net *tn, u32 index, struct nlattr *est, |
255 | struct tc_action *a, int size, int bind, bool cpustats) | |
e9ce1cd3 DM |
256 | { |
257 | struct tcf_common *p = kzalloc(size, GFP_KERNEL); | |
ddf97ccd | 258 | struct tcf_hashinfo *hinfo = tn->hinfo; |
519c818e | 259 | int err = -ENOMEM; |
e9ce1cd3 DM |
260 | |
261 | if (unlikely(!p)) | |
86062033 | 262 | return -ENOMEM; |
e9ce1cd3 DM |
263 | p->tcfc_refcnt = 1; |
264 | if (bind) | |
265 | p->tcfc_bindcnt = 1; | |
266 | ||
519c818e ED |
267 | if (cpustats) { |
268 | p->cpu_bstats = netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); | |
269 | if (!p->cpu_bstats) { | |
270 | err1: | |
271 | kfree(p); | |
272 | return err; | |
273 | } | |
274 | p->cpu_qstats = alloc_percpu(struct gnet_stats_queue); | |
275 | if (!p->cpu_qstats) { | |
276 | err2: | |
277 | free_percpu(p->cpu_bstats); | |
278 | goto err1; | |
279 | } | |
280 | } | |
e9ce1cd3 | 281 | spin_lock_init(&p->tcfc_lock); |
89819dc0 | 282 | INIT_HLIST_NODE(&p->tcfc_head); |
ddf97ccd | 283 | p->tcfc_index = index ? index : tcf_hash_new_index(tn); |
e9ce1cd3 DM |
284 | p->tcfc_tm.install = jiffies; |
285 | p->tcfc_tm.lastuse = jiffies; | |
0e991ec6 | 286 | if (est) { |
519c818e ED |
287 | err = gen_new_estimator(&p->tcfc_bstats, p->cpu_bstats, |
288 | &p->tcfc_rate_est, | |
289 | &p->tcfc_lock, est); | |
0e991ec6 | 290 | if (err) { |
519c818e ED |
291 | free_percpu(p->cpu_qstats); |
292 | goto err2; | |
0e991ec6 SH |
293 | } |
294 | } | |
295 | ||
e9ce1cd3 | 296 | a->priv = (void *) p; |
ddf97ccd | 297 | a->hinfo = hinfo; |
86062033 | 298 | return 0; |
e9ce1cd3 DM |
299 | } |
300 | EXPORT_SYMBOL(tcf_hash_create); | |
301 | ||
ddf97ccd | 302 | void tcf_hash_insert(struct tc_action_net *tn, struct tc_action *a) |
e9ce1cd3 | 303 | { |
86062033 | 304 | struct tcf_common *p = a->priv; |
ddf97ccd | 305 | struct tcf_hashinfo *hinfo = tn->hinfo; |
e9ce1cd3 DM |
306 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); |
307 | ||
89819dc0 WC |
308 | spin_lock_bh(&hinfo->lock); |
309 | hlist_add_head(&p->tcfc_head, &hinfo->htab[h]); | |
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 | struct tc_action a = { |
318 | .ops = ops, | |
ddf97ccd | 319 | .hinfo = hinfo, |
1d4150c0 WC |
320 | }; |
321 | int i; | |
322 | ||
323 | for (i = 0; i < hinfo->hmask + 1; i++) { | |
324 | struct tcf_common *p; | |
325 | struct hlist_node *n; | |
326 | ||
327 | hlist_for_each_entry_safe(p, n, &hinfo->htab[i], tcfc_head) { | |
328 | int ret; | |
329 | ||
330 | a.priv = p; | |
331 | ret = __tcf_hash_release(&a, false, true); | |
332 | if (ret == ACT_P_DELETED) | |
333 | module_put(ops->owner); | |
334 | else if (ret < 0) | |
335 | return; | |
336 | } | |
337 | } | |
338 | kfree(hinfo->htab); | |
339 | } | |
ddf97ccd | 340 | EXPORT_SYMBOL(tcf_hashinfo_destroy); |
1d4150c0 | 341 | |
1f747c26 | 342 | static LIST_HEAD(act_base); |
1da177e4 LT |
343 | static DEFINE_RWLOCK(act_mod_lock); |
344 | ||
ddf97ccd WC |
345 | int tcf_register_action(struct tc_action_ops *act, |
346 | struct pernet_operations *ops) | |
1da177e4 | 347 | { |
1f747c26 | 348 | struct tc_action_ops *a; |
ddf97ccd | 349 | int ret; |
1da177e4 | 350 | |
ddf97ccd | 351 | if (!act->act || !act->dump || !act->init || !act->walk || !act->lookup) |
76c82d7a JHS |
352 | return -EINVAL; |
353 | ||
1da177e4 | 354 | write_lock(&act_mod_lock); |
1f747c26 | 355 | list_for_each_entry(a, &act_base, head) { |
1da177e4 LT |
356 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { |
357 | write_unlock(&act_mod_lock); | |
358 | return -EEXIST; | |
359 | } | |
360 | } | |
1f747c26 | 361 | list_add_tail(&act->head, &act_base); |
1da177e4 | 362 | write_unlock(&act_mod_lock); |
ddf97ccd WC |
363 | |
364 | ret = register_pernet_subsys(ops); | |
365 | if (ret) { | |
366 | tcf_unregister_action(act, ops); | |
367 | return ret; | |
368 | } | |
369 | ||
1da177e4 LT |
370 | return 0; |
371 | } | |
62e3ba1b | 372 | EXPORT_SYMBOL(tcf_register_action); |
1da177e4 | 373 | |
ddf97ccd WC |
374 | int tcf_unregister_action(struct tc_action_ops *act, |
375 | struct pernet_operations *ops) | |
1da177e4 | 376 | { |
1f747c26 | 377 | struct tc_action_ops *a; |
1da177e4 LT |
378 | int err = -ENOENT; |
379 | ||
ddf97ccd WC |
380 | unregister_pernet_subsys(ops); |
381 | ||
1da177e4 | 382 | write_lock(&act_mod_lock); |
a792866a ED |
383 | list_for_each_entry(a, &act_base, head) { |
384 | if (a == act) { | |
385 | list_del(&act->head); | |
386 | err = 0; | |
1da177e4 | 387 | break; |
a792866a | 388 | } |
1da177e4 LT |
389 | } |
390 | write_unlock(&act_mod_lock); | |
391 | return err; | |
392 | } | |
62e3ba1b | 393 | EXPORT_SYMBOL(tcf_unregister_action); |
1da177e4 LT |
394 | |
395 | /* lookup by name */ | |
396 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
397 | { | |
a792866a | 398 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
399 | |
400 | if (kind) { | |
401 | read_lock(&act_mod_lock); | |
1f747c26 | 402 | list_for_each_entry(a, &act_base, head) { |
1da177e4 | 403 | if (strcmp(kind, a->kind) == 0) { |
a792866a ED |
404 | if (try_module_get(a->owner)) |
405 | res = a; | |
1da177e4 LT |
406 | break; |
407 | } | |
408 | } | |
409 | read_unlock(&act_mod_lock); | |
410 | } | |
a792866a | 411 | return res; |
1da177e4 LT |
412 | } |
413 | ||
7ba699c6 PM |
414 | /* lookup by nlattr */ |
415 | static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) | |
1da177e4 | 416 | { |
a792866a | 417 | struct tc_action_ops *a, *res = NULL; |
1da177e4 LT |
418 | |
419 | if (kind) { | |
420 | read_lock(&act_mod_lock); | |
1f747c26 | 421 | list_for_each_entry(a, &act_base, head) { |
7ba699c6 | 422 | if (nla_strcmp(kind, a->kind) == 0) { |
a792866a ED |
423 | if (try_module_get(a->owner)) |
424 | res = a; | |
1da177e4 LT |
425 | break; |
426 | } | |
427 | } | |
428 | read_unlock(&act_mod_lock); | |
429 | } | |
a792866a | 430 | return res; |
1da177e4 | 431 | } |
1da177e4 | 432 | |
33be6271 | 433 | int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions, |
10297b99 | 434 | struct tcf_result *res) |
1da177e4 | 435 | { |
dc7f9f6e | 436 | const struct tc_action *a; |
1da177e4 LT |
437 | int ret = -1; |
438 | ||
439 | if (skb->tc_verd & TC_NCLS) { | |
440 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
1da177e4 LT |
441 | ret = TC_ACT_OK; |
442 | goto exec_done; | |
443 | } | |
33be6271 | 444 | list_for_each_entry(a, actions, list) { |
1da177e4 | 445 | repeat: |
63acd680 | 446 | ret = a->ops->act(skb, a, res); |
63acd680 JHS |
447 | if (ret == TC_ACT_REPEAT) |
448 | goto repeat; /* we need a ttl - JHS */ | |
449 | if (ret != TC_ACT_PIPE) | |
450 | goto exec_done; | |
1da177e4 LT |
451 | } |
452 | exec_done: | |
1da177e4 LT |
453 | return ret; |
454 | } | |
62e3ba1b | 455 | EXPORT_SYMBOL(tcf_action_exec); |
1da177e4 | 456 | |
55334a5d | 457 | int tcf_action_destroy(struct list_head *actions, int bind) |
1da177e4 | 458 | { |
33be6271 | 459 | struct tc_action *a, *tmp; |
55334a5d | 460 | int ret = 0; |
1da177e4 | 461 | |
33be6271 | 462 | list_for_each_entry_safe(a, tmp, actions, list) { |
28e6b67f | 463 | ret = __tcf_hash_release(a, bind, true); |
55334a5d | 464 | if (ret == ACT_P_DELETED) |
63acd680 | 465 | module_put(a->ops->owner); |
55334a5d WC |
466 | else if (ret < 0) |
467 | return ret; | |
63acd680 JHS |
468 | list_del(&a->list); |
469 | kfree(a); | |
1da177e4 | 470 | } |
55334a5d | 471 | return ret; |
1da177e4 LT |
472 | } |
473 | ||
474 | int | |
475 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
476 | { | |
1da177e4 LT |
477 | return a->ops->dump(skb, a, bind, ref); |
478 | } | |
479 | ||
480 | int | |
481 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
482 | { | |
483 | int err = -EINVAL; | |
27a884dc | 484 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 485 | struct nlattr *nest; |
1da177e4 | 486 | |
1b34ec43 DM |
487 | if (nla_put_string(skb, TCA_KIND, a->ops->kind)) |
488 | goto nla_put_failure; | |
1da177e4 | 489 | if (tcf_action_copy_stats(skb, a, 0)) |
7ba699c6 | 490 | goto nla_put_failure; |
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 LT |
505 | |
506 | int | |
33be6271 | 507 | tcf_action_dump(struct sk_buff *skb, struct list_head *actions, 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 | ||
c1b52739 BL |
532 | struct tc_action *tcf_action_init_1(struct net *net, struct nlattr *nla, |
533 | struct nlattr *est, char *name, int ovr, | |
534 | int bind) | |
1da177e4 LT |
535 | { |
536 | struct tc_action *a; | |
537 | struct tc_action_ops *a_o; | |
538 | char act_name[IFNAMSIZ]; | |
cc7ec456 | 539 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 540 | struct nlattr *kind; |
ab27cfb8 | 541 | int err; |
1da177e4 | 542 | |
1da177e4 | 543 | if (name == NULL) { |
cee63723 PM |
544 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
545 | if (err < 0) | |
1da177e4 | 546 | goto err_out; |
cee63723 | 547 | err = -EINVAL; |
7ba699c6 | 548 | kind = tb[TCA_ACT_KIND]; |
1da177e4 LT |
549 | if (kind == NULL) |
550 | goto err_out; | |
7ba699c6 | 551 | if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) |
1da177e4 LT |
552 | goto err_out; |
553 | } else { | |
cee63723 | 554 | err = -EINVAL; |
1da177e4 LT |
555 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) |
556 | goto err_out; | |
557 | } | |
558 | ||
559 | a_o = tc_lookup_action_n(act_name); | |
560 | if (a_o == NULL) { | |
95a5afca | 561 | #ifdef CONFIG_MODULES |
1da177e4 | 562 | rtnl_unlock(); |
4bba3925 | 563 | request_module("act_%s", act_name); |
1da177e4 LT |
564 | rtnl_lock(); |
565 | ||
566 | a_o = tc_lookup_action_n(act_name); | |
567 | ||
568 | /* We dropped the RTNL semaphore in order to | |
569 | * perform the module load. So, even if we | |
570 | * succeeded in loading the module we have to | |
571 | * tell the caller to replay the request. We | |
572 | * indicate this using -EAGAIN. | |
573 | */ | |
574 | if (a_o != NULL) { | |
ab27cfb8 | 575 | err = -EAGAIN; |
1da177e4 LT |
576 | goto err_mod; |
577 | } | |
578 | #endif | |
ab27cfb8 | 579 | err = -ENOENT; |
1da177e4 LT |
580 | goto err_out; |
581 | } | |
582 | ||
ab27cfb8 | 583 | err = -ENOMEM; |
0da974f4 | 584 | a = kzalloc(sizeof(*a), GFP_KERNEL); |
1da177e4 LT |
585 | if (a == NULL) |
586 | goto err_mod; | |
1da177e4 | 587 | |
c779f7af | 588 | a->ops = a_o; |
33be6271 | 589 | INIT_LIST_HEAD(&a->list); |
1da177e4 LT |
590 | /* backward compatibility for policer */ |
591 | if (name == NULL) | |
c1b52739 | 592 | err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, a, ovr, bind); |
1da177e4 | 593 | else |
c1b52739 | 594 | err = a_o->init(net, nla, est, a, ovr, bind); |
ab27cfb8 | 595 | if (err < 0) |
1da177e4 LT |
596 | goto err_free; |
597 | ||
598 | /* module count goes up only when brand new policy is created | |
cc7ec456 ED |
599 | * if it exists and is only bound to in a_o->init() then |
600 | * ACT_P_CREATED is not returned (a zero is). | |
601 | */ | |
ab27cfb8 | 602 | if (err != ACT_P_CREATED) |
1da177e4 | 603 | module_put(a_o->owner); |
1da177e4 | 604 | |
1da177e4 LT |
605 | return a; |
606 | ||
607 | err_free: | |
608 | kfree(a); | |
609 | err_mod: | |
610 | module_put(a_o->owner); | |
611 | err_out: | |
ab27cfb8 | 612 | return ERR_PTR(err); |
1da177e4 LT |
613 | } |
614 | ||
33be6271 | 615 | int tcf_action_init(struct net *net, struct nlattr *nla, |
c1b52739 | 616 | struct nlattr *est, char *name, int ovr, |
33be6271 | 617 | int bind, struct list_head *actions) |
1da177e4 | 618 | { |
cc7ec456 | 619 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 | 620 | struct tc_action *act; |
cee63723 | 621 | int err; |
1da177e4 LT |
622 | int i; |
623 | ||
cee63723 PM |
624 | err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
625 | if (err < 0) | |
33be6271 | 626 | return err; |
1da177e4 | 627 | |
7ba699c6 | 628 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
c1b52739 | 629 | act = tcf_action_init_1(net, tb[i], est, name, ovr, bind); |
33be6271 WC |
630 | if (IS_ERR(act)) { |
631 | err = PTR_ERR(act); | |
1da177e4 | 632 | goto err; |
33be6271 | 633 | } |
7ba699c6 | 634 | act->order = i; |
33be6271 | 635 | list_add_tail(&act->list, actions); |
1da177e4 | 636 | } |
33be6271 | 637 | return 0; |
1da177e4 LT |
638 | |
639 | err: | |
33be6271 WC |
640 | tcf_action_destroy(actions, bind); |
641 | return err; | |
1da177e4 LT |
642 | } |
643 | ||
644 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a, | |
645 | int compat_mode) | |
646 | { | |
647 | int err = 0; | |
648 | struct gnet_dump d; | |
7eb8896d | 649 | struct tcf_common *p = a->priv; |
10297b99 | 650 | |
7eb8896d | 651 | if (p == NULL) |
1da177e4 LT |
652 | goto errout; |
653 | ||
654 | /* compat_mode being true specifies a call that is supposed | |
06fe9fb4 | 655 | * to add additional backward compatibility statistic TLVs. |
1da177e4 LT |
656 | */ |
657 | if (compat_mode) { | |
658 | if (a->type == TCA_OLD_COMPAT) | |
659 | err = gnet_stats_start_copy_compat(skb, 0, | |
9854518e ND |
660 | TCA_STATS, |
661 | TCA_XSTATS, | |
662 | &p->tcfc_lock, &d, | |
663 | TCA_PAD); | |
1da177e4 LT |
664 | else |
665 | return 0; | |
666 | } else | |
667 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
9854518e | 668 | &p->tcfc_lock, &d, TCA_ACT_PAD); |
1da177e4 LT |
669 | |
670 | if (err < 0) | |
671 | goto errout; | |
672 | ||
519c818e | 673 | if (gnet_stats_copy_basic(&d, p->cpu_bstats, &p->tcfc_bstats) < 0 || |
7eb8896d WC |
674 | gnet_stats_copy_rate_est(&d, &p->tcfc_bstats, |
675 | &p->tcfc_rate_est) < 0 || | |
519c818e | 676 | gnet_stats_copy_queue(&d, p->cpu_qstats, |
64015853 JF |
677 | &p->tcfc_qstats, |
678 | p->tcfc_qstats.qlen) < 0) | |
1da177e4 LT |
679 | goto errout; |
680 | ||
681 | if (gnet_stats_finish_copy(&d) < 0) | |
682 | goto errout; | |
683 | ||
684 | return 0; | |
685 | ||
686 | errout: | |
687 | return -1; | |
688 | } | |
689 | ||
690 | static int | |
33be6271 | 691 | tca_get_fill(struct sk_buff *skb, struct list_head *actions, u32 portid, u32 seq, |
10297b99 | 692 | u16 flags, int event, int bind, int ref) |
1da177e4 LT |
693 | { |
694 | struct tcamsg *t; | |
695 | struct nlmsghdr *nlh; | |
27a884dc | 696 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 697 | struct nlattr *nest; |
1da177e4 | 698 | |
15e47304 | 699 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*t), flags); |
8b00a53c DM |
700 | if (!nlh) |
701 | goto out_nlmsg_trim; | |
702 | t = nlmsg_data(nlh); | |
1da177e4 | 703 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
704 | t->tca__pad1 = 0; |
705 | t->tca__pad2 = 0; | |
10297b99 | 706 | |
4b3550ef PM |
707 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
708 | if (nest == NULL) | |
8b00a53c | 709 | goto out_nlmsg_trim; |
1da177e4 | 710 | |
33be6271 | 711 | if (tcf_action_dump(skb, actions, bind, ref) < 0) |
8b00a53c | 712 | goto out_nlmsg_trim; |
1da177e4 | 713 | |
4b3550ef | 714 | nla_nest_end(skb, nest); |
10297b99 | 715 | |
27a884dc | 716 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
717 | return skb->len; |
718 | ||
8b00a53c | 719 | out_nlmsg_trim: |
dc5fc579 | 720 | nlmsg_trim(skb, b); |
1da177e4 LT |
721 | return -1; |
722 | } | |
723 | ||
724 | static int | |
15e47304 | 725 | act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n, |
33be6271 | 726 | struct list_head *actions, int event) |
1da177e4 LT |
727 | { |
728 | struct sk_buff *skb; | |
1da177e4 LT |
729 | |
730 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
731 | if (!skb) | |
732 | return -ENOBUFS; | |
33be6271 | 733 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { |
1da177e4 LT |
734 | kfree_skb(skb); |
735 | return -EINVAL; | |
736 | } | |
2942e900 | 737 | |
15e47304 | 738 | return rtnl_unicast(skb, net, portid); |
1da177e4 LT |
739 | } |
740 | ||
03701d6e WC |
741 | static struct tc_action *create_a(int i) |
742 | { | |
743 | struct tc_action *act; | |
744 | ||
745 | act = kzalloc(sizeof(*act), GFP_KERNEL); | |
746 | if (act == NULL) { | |
747 | pr_debug("create_a: failed to alloc!\n"); | |
748 | return NULL; | |
749 | } | |
750 | act->order = i; | |
751 | INIT_LIST_HEAD(&act->list); | |
752 | return act; | |
753 | } | |
754 | ||
ddf97ccd WC |
755 | static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla, |
756 | struct nlmsghdr *n, u32 portid) | |
1da177e4 | 757 | { |
cc7ec456 | 758 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
1da177e4 LT |
759 | struct tc_action *a; |
760 | int index; | |
ab27cfb8 | 761 | int err; |
1da177e4 | 762 | |
cee63723 PM |
763 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
764 | if (err < 0) | |
ab27cfb8 | 765 | goto err_out; |
1da177e4 | 766 | |
cee63723 | 767 | err = -EINVAL; |
7ba699c6 PM |
768 | if (tb[TCA_ACT_INDEX] == NULL || |
769 | nla_len(tb[TCA_ACT_INDEX]) < sizeof(index)) | |
ab27cfb8 | 770 | goto err_out; |
1587bac4 | 771 | index = nla_get_u32(tb[TCA_ACT_INDEX]); |
1da177e4 | 772 | |
ab27cfb8 | 773 | err = -ENOMEM; |
03701d6e | 774 | a = create_a(0); |
1da177e4 | 775 | if (a == NULL) |
ab27cfb8 | 776 | goto err_out; |
1da177e4 | 777 | |
ab27cfb8 | 778 | err = -EINVAL; |
7ba699c6 | 779 | a->ops = tc_lookup_action(tb[TCA_ACT_KIND]); |
63acd680 | 780 | if (a->ops == NULL) /* could happen in batch of actions */ |
1da177e4 | 781 | goto err_free; |
ab27cfb8 | 782 | err = -ENOENT; |
ddf97ccd | 783 | if (a->ops->lookup(net, a, index) == 0) |
1da177e4 LT |
784 | goto err_mod; |
785 | ||
786 | module_put(a->ops->owner); | |
1da177e4 | 787 | return a; |
ab27cfb8 | 788 | |
1da177e4 LT |
789 | err_mod: |
790 | module_put(a->ops->owner); | |
791 | err_free: | |
792 | kfree(a); | |
ab27cfb8 PM |
793 | err_out: |
794 | return ERR_PTR(err); | |
1da177e4 LT |
795 | } |
796 | ||
33be6271 | 797 | static void cleanup_a(struct list_head *actions) |
1da177e4 | 798 | { |
33be6271 | 799 | struct tc_action *a, *tmp; |
1da177e4 | 800 | |
33be6271 WC |
801 | list_for_each_entry_safe(a, tmp, actions, list) { |
802 | list_del(&a->list); | |
1da177e4 LT |
803 | kfree(a); |
804 | } | |
805 | } | |
806 | ||
7316ae88 | 807 | static int tca_action_flush(struct net *net, struct nlattr *nla, |
15e47304 | 808 | struct nlmsghdr *n, u32 portid) |
1da177e4 LT |
809 | { |
810 | struct sk_buff *skb; | |
811 | unsigned char *b; | |
812 | struct nlmsghdr *nlh; | |
813 | struct tcamsg *t; | |
814 | struct netlink_callback dcb; | |
4b3550ef | 815 | struct nlattr *nest; |
cc7ec456 | 816 | struct nlattr *tb[TCA_ACT_MAX + 1]; |
7ba699c6 | 817 | struct nlattr *kind; |
03701d6e | 818 | struct tc_action a; |
36723873 | 819 | int err = -ENOMEM; |
1da177e4 | 820 | |
1da177e4 LT |
821 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
822 | if (!skb) { | |
6ff9c364 | 823 | pr_debug("tca_action_flush: failed skb alloc\n"); |
36723873 | 824 | return err; |
1da177e4 LT |
825 | } |
826 | ||
27a884dc | 827 | b = skb_tail_pointer(skb); |
1da177e4 | 828 | |
cee63723 PM |
829 | err = nla_parse_nested(tb, TCA_ACT_MAX, nla, NULL); |
830 | if (err < 0) | |
1da177e4 LT |
831 | goto err_out; |
832 | ||
cee63723 | 833 | err = -EINVAL; |
7ba699c6 | 834 | kind = tb[TCA_ACT_KIND]; |
03701d6e WC |
835 | memset(&a, 0, sizeof(struct tc_action)); |
836 | INIT_LIST_HEAD(&a.list); | |
837 | a.ops = tc_lookup_action(kind); | |
838 | if (a.ops == NULL) /*some idjot trying to flush unknown action */ | |
1da177e4 LT |
839 | goto err_out; |
840 | ||
15e47304 | 841 | nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t), 0); |
8b00a53c DM |
842 | if (!nlh) |
843 | goto out_module_put; | |
844 | t = nlmsg_data(nlh); | |
1da177e4 | 845 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
846 | t->tca__pad1 = 0; |
847 | t->tca__pad2 = 0; | |
1da177e4 | 848 | |
4b3550ef PM |
849 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
850 | if (nest == NULL) | |
8b00a53c | 851 | goto out_module_put; |
1da177e4 | 852 | |
ddf97ccd | 853 | err = a.ops->walk(net, skb, &dcb, RTM_DELACTION, &a); |
1da177e4 | 854 | if (err < 0) |
8b00a53c | 855 | goto out_module_put; |
f97017cd JHS |
856 | if (err == 0) |
857 | goto noflush_out; | |
1da177e4 | 858 | |
4b3550ef | 859 | nla_nest_end(skb, nest); |
1da177e4 | 860 | |
27a884dc | 861 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 | 862 | nlh->nlmsg_flags |= NLM_F_ROOT; |
03701d6e | 863 | module_put(a.ops->owner); |
15e47304 | 864 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
cc7ec456 | 865 | n->nlmsg_flags & NLM_F_ECHO); |
1da177e4 LT |
866 | if (err > 0) |
867 | return 0; | |
868 | ||
869 | return err; | |
870 | ||
8b00a53c | 871 | out_module_put: |
03701d6e | 872 | module_put(a.ops->owner); |
1da177e4 | 873 | err_out: |
f97017cd | 874 | noflush_out: |
1da177e4 | 875 | kfree_skb(skb); |
1da177e4 LT |
876 | return err; |
877 | } | |
878 | ||
a56e1953 WC |
879 | static int |
880 | tcf_del_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions, | |
881 | u32 portid) | |
882 | { | |
883 | int ret; | |
884 | struct sk_buff *skb; | |
885 | ||
886 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
887 | if (!skb) | |
888 | return -ENOBUFS; | |
889 | ||
890 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, RTM_DELACTION, | |
891 | 0, 1) <= 0) { | |
892 | kfree_skb(skb); | |
893 | return -EINVAL; | |
894 | } | |
895 | ||
896 | /* now do the delete */ | |
55334a5d WC |
897 | ret = tcf_action_destroy(actions, 0); |
898 | if (ret < 0) { | |
899 | kfree_skb(skb); | |
900 | return ret; | |
901 | } | |
a56e1953 WC |
902 | |
903 | ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC, | |
904 | n->nlmsg_flags & NLM_F_ECHO); | |
905 | if (ret > 0) | |
906 | return 0; | |
907 | return ret; | |
908 | } | |
909 | ||
1da177e4 | 910 | static int |
7316ae88 | 911 | tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
15e47304 | 912 | u32 portid, int event) |
1da177e4 | 913 | { |
cee63723 | 914 | int i, ret; |
cc7ec456 | 915 | struct nlattr *tb[TCA_ACT_MAX_PRIO + 1]; |
33be6271 WC |
916 | struct tc_action *act; |
917 | LIST_HEAD(actions); | |
1da177e4 | 918 | |
cee63723 PM |
919 | ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL); |
920 | if (ret < 0) | |
921 | return ret; | |
1da177e4 | 922 | |
cc7ec456 | 923 | if (event == RTM_DELACTION && n->nlmsg_flags & NLM_F_ROOT) { |
f97017cd | 924 | if (tb[1] != NULL) |
15e47304 | 925 | return tca_action_flush(net, tb[1], n, portid); |
f97017cd JHS |
926 | else |
927 | return -EINVAL; | |
1da177e4 LT |
928 | } |
929 | ||
7ba699c6 | 930 | for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { |
ddf97ccd | 931 | act = tcf_action_get_1(net, tb[i], n, portid); |
ab27cfb8 PM |
932 | if (IS_ERR(act)) { |
933 | ret = PTR_ERR(act); | |
1da177e4 | 934 | goto err; |
ab27cfb8 | 935 | } |
7ba699c6 | 936 | act->order = i; |
33be6271 | 937 | list_add_tail(&act->list, &actions); |
1da177e4 LT |
938 | } |
939 | ||
940 | if (event == RTM_GETACTION) | |
33be6271 | 941 | ret = act_get_notify(net, portid, n, &actions, event); |
1da177e4 | 942 | else { /* delete */ |
a56e1953 WC |
943 | ret = tcf_del_notify(net, n, &actions, portid); |
944 | if (ret) | |
1da177e4 | 945 | goto err; |
1da177e4 LT |
946 | return ret; |
947 | } | |
948 | err: | |
33be6271 | 949 | cleanup_a(&actions); |
1da177e4 LT |
950 | return ret; |
951 | } | |
952 | ||
a56e1953 WC |
953 | static int |
954 | tcf_add_notify(struct net *net, struct nlmsghdr *n, struct list_head *actions, | |
955 | u32 portid) | |
1da177e4 | 956 | { |
1da177e4 | 957 | struct sk_buff *skb; |
1da177e4 LT |
958 | int err = 0; |
959 | ||
960 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
961 | if (!skb) | |
962 | return -ENOBUFS; | |
963 | ||
a56e1953 WC |
964 | if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, n->nlmsg_flags, |
965 | RTM_NEWACTION, 0, 0) <= 0) { | |
966 | kfree_skb(skb); | |
967 | return -EINVAL; | |
968 | } | |
10297b99 | 969 | |
a56e1953 WC |
970 | err = rtnetlink_send(skb, net, portid, RTNLGRP_TC, |
971 | n->nlmsg_flags & NLM_F_ECHO); | |
1da177e4 LT |
972 | if (err > 0) |
973 | err = 0; | |
974 | return err; | |
1da177e4 LT |
975 | } |
976 | ||
1da177e4 | 977 | static int |
7316ae88 | 978 | tcf_action_add(struct net *net, struct nlattr *nla, struct nlmsghdr *n, |
15e47304 | 979 | u32 portid, int ovr) |
1da177e4 LT |
980 | { |
981 | int ret = 0; | |
33be6271 | 982 | LIST_HEAD(actions); |
1da177e4 | 983 | |
33be6271 WC |
984 | ret = tcf_action_init(net, nla, NULL, NULL, ovr, 0, &actions); |
985 | if (ret) | |
ab27cfb8 | 986 | goto done; |
1da177e4 LT |
987 | |
988 | /* dump then free all the actions after update; inserted policy | |
989 | * stays intact | |
cc7ec456 | 990 | */ |
a56e1953 | 991 | ret = tcf_add_notify(net, n, &actions, portid); |
33be6271 | 992 | cleanup_a(&actions); |
1da177e4 LT |
993 | done: |
994 | return ret; | |
995 | } | |
996 | ||
661d2967 | 997 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n) |
1da177e4 | 998 | { |
3b1e0a65 | 999 | struct net *net = sock_net(skb->sk); |
7ba699c6 | 1000 | struct nlattr *tca[TCA_ACT_MAX + 1]; |
15e47304 | 1001 | u32 portid = skb ? NETLINK_CB(skb).portid : 0; |
1da177e4 LT |
1002 | int ret = 0, ovr = 0; |
1003 | ||
90f62cf3 | 1004 | if ((n->nlmsg_type != RTM_GETACTION) && !netlink_capable(skb, CAP_NET_ADMIN)) |
dfc47ef8 EB |
1005 | return -EPERM; |
1006 | ||
7ba699c6 PM |
1007 | ret = nlmsg_parse(n, sizeof(struct tcamsg), tca, TCA_ACT_MAX, NULL); |
1008 | if (ret < 0) | |
1009 | return ret; | |
1010 | ||
1011 | if (tca[TCA_ACT_TAB] == NULL) { | |
6ff9c364 | 1012 | pr_notice("tc_ctl_action: received NO action attribs\n"); |
1da177e4 LT |
1013 | return -EINVAL; |
1014 | } | |
1015 | ||
cc7ec456 | 1016 | /* n->nlmsg_flags & NLM_F_CREATE */ |
1da177e4 LT |
1017 | switch (n->nlmsg_type) { |
1018 | case RTM_NEWACTION: | |
1019 | /* we are going to assume all other flags | |
25985edc | 1020 | * imply create only if it doesn't exist |
1da177e4 LT |
1021 | * Note that CREATE | EXCL implies that |
1022 | * but since we want avoid ambiguity (eg when flags | |
1023 | * is zero) then just set this | |
1024 | */ | |
cc7ec456 | 1025 | if (n->nlmsg_flags & NLM_F_REPLACE) |
1da177e4 LT |
1026 | ovr = 1; |
1027 | replay: | |
15e47304 | 1028 | ret = tcf_action_add(net, tca[TCA_ACT_TAB], n, portid, ovr); |
1da177e4 LT |
1029 | if (ret == -EAGAIN) |
1030 | goto replay; | |
1031 | break; | |
1032 | case RTM_DELACTION: | |
7316ae88 | 1033 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
15e47304 | 1034 | portid, RTM_DELACTION); |
1da177e4 LT |
1035 | break; |
1036 | case RTM_GETACTION: | |
7316ae88 | 1037 | ret = tca_action_gd(net, tca[TCA_ACT_TAB], n, |
15e47304 | 1038 | portid, RTM_GETACTION); |
1da177e4 LT |
1039 | break; |
1040 | default: | |
1041 | BUG(); | |
1042 | } | |
1043 | ||
1044 | return ret; | |
1045 | } | |
1046 | ||
7ba699c6 | 1047 | static struct nlattr * |
3a6c2b41 | 1048 | 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 | |
c96c9471 | 1055 | if (nlmsg_parse(n, sizeof(struct tcamsg), nla, TCAA_MAX, NULL) < 0) |
1da177e4 | 1056 | return NULL; |
7ba699c6 | 1057 | tb1 = nla[TCA_ACT_TAB]; |
1da177e4 LT |
1058 | if (tb1 == NULL) |
1059 | return NULL; | |
1060 | ||
7ba699c6 PM |
1061 | if (nla_parse(tb, TCA_ACT_MAX_PRIO, nla_data(tb1), |
1062 | NLMSG_ALIGN(nla_len(tb1)), NULL) < 0) | |
1da177e4 | 1063 | return NULL; |
1da177e4 | 1064 | |
6d834e04 PM |
1065 | if (tb[1] == NULL) |
1066 | return NULL; | |
1067 | if (nla_parse(tb2, TCA_ACT_MAX, nla_data(tb[1]), | |
1068 | nla_len(tb[1]), NULL) < 0) | |
1da177e4 | 1069 | return NULL; |
7ba699c6 | 1070 | kind = tb2[TCA_ACT_KIND]; |
1da177e4 | 1071 | |
26dab893 | 1072 | return kind; |
1da177e4 LT |
1073 | } |
1074 | ||
1075 | static int | |
1076 | tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) | |
1077 | { | |
ddf97ccd | 1078 | struct net *net = sock_net(skb->sk); |
1da177e4 | 1079 | struct nlmsghdr *nlh; |
27a884dc | 1080 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 1081 | struct nlattr *nest; |
1da177e4 LT |
1082 | struct tc_action_ops *a_o; |
1083 | struct tc_action a; | |
1084 | int ret = 0; | |
8b00a53c | 1085 | struct tcamsg *t = (struct tcamsg *) nlmsg_data(cb->nlh); |
7ba699c6 | 1086 | struct nlattr *kind = find_dump_kind(cb->nlh); |
1da177e4 LT |
1087 | |
1088 | if (kind == NULL) { | |
6ff9c364 | 1089 | pr_info("tc_dump_action: action bad kind\n"); |
1da177e4 LT |
1090 | return 0; |
1091 | } | |
1092 | ||
26dab893 | 1093 | a_o = tc_lookup_action(kind); |
cc7ec456 | 1094 | if (a_o == NULL) |
1da177e4 | 1095 | return 0; |
1da177e4 LT |
1096 | |
1097 | memset(&a, 0, sizeof(struct tc_action)); | |
1098 | a.ops = a_o; | |
1099 | ||
15e47304 | 1100 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
8b00a53c DM |
1101 | cb->nlh->nlmsg_type, sizeof(*t), 0); |
1102 | if (!nlh) | |
1103 | goto out_module_put; | |
1104 | t = nlmsg_data(nlh); | |
1da177e4 | 1105 | t->tca_family = AF_UNSPEC; |
9ef1d4c7 PM |
1106 | t->tca__pad1 = 0; |
1107 | t->tca__pad2 = 0; | |
1da177e4 | 1108 | |
4b3550ef PM |
1109 | nest = nla_nest_start(skb, TCA_ACT_TAB); |
1110 | if (nest == NULL) | |
8b00a53c | 1111 | goto out_module_put; |
1da177e4 | 1112 | |
ddf97ccd | 1113 | ret = a_o->walk(net, skb, cb, RTM_GETACTION, &a); |
1da177e4 | 1114 | if (ret < 0) |
8b00a53c | 1115 | goto out_module_put; |
1da177e4 LT |
1116 | |
1117 | if (ret > 0) { | |
4b3550ef | 1118 | nla_nest_end(skb, nest); |
1da177e4 LT |
1119 | ret = skb->len; |
1120 | } else | |
4b3550ef | 1121 | nla_nest_cancel(skb, nest); |
1da177e4 | 1122 | |
27a884dc | 1123 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
15e47304 | 1124 | if (NETLINK_CB(cb->skb).portid && ret) |
1da177e4 LT |
1125 | nlh->nlmsg_flags |= NLM_F_MULTI; |
1126 | module_put(a_o->owner); | |
1127 | return skb->len; | |
1128 | ||
8b00a53c | 1129 | out_module_put: |
1da177e4 | 1130 | module_put(a_o->owner); |
dc5fc579 | 1131 | nlmsg_trim(skb, b); |
1da177e4 LT |
1132 | return skb->len; |
1133 | } | |
1134 | ||
1135 | static int __init tc_action_init(void) | |
1136 | { | |
c7ac8679 GR |
1137 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL); |
1138 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL); | |
1139 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, | |
1140 | NULL); | |
1da177e4 | 1141 | |
1da177e4 LT |
1142 | return 0; |
1143 | } | |
1144 | ||
1145 | subsys_initcall(tc_action_init); |