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> |
1da177e4 | 18 | #include <linux/skbuff.h> |
1da177e4 LT |
19 | #include <linux/init.h> |
20 | #include <linux/kmod.h> | |
1da177e4 LT |
21 | #include <net/sch_generic.h> |
22 | #include <net/act_api.h> | |
dc5fc579 | 23 | #include <net/netlink.h> |
1da177e4 | 24 | |
e9ce1cd3 DM |
25 | void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo) |
26 | { | |
27 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); | |
28 | struct tcf_common **p1p; | |
29 | ||
30 | for (p1p = &hinfo->htab[h]; *p1p; p1p = &(*p1p)->tcfc_next) { | |
31 | if (*p1p == p) { | |
32 | write_lock_bh(hinfo->lock); | |
33 | *p1p = p->tcfc_next; | |
34 | write_unlock_bh(hinfo->lock); | |
e9ce1cd3 DM |
35 | gen_kill_estimator(&p->tcfc_bstats, |
36 | &p->tcfc_rate_est); | |
e9ce1cd3 DM |
37 | kfree(p); |
38 | return; | |
39 | } | |
40 | } | |
41 | BUG_TRAP(0); | |
42 | } | |
43 | EXPORT_SYMBOL(tcf_hash_destroy); | |
44 | ||
45 | int tcf_hash_release(struct tcf_common *p, int bind, | |
46 | struct tcf_hashinfo *hinfo) | |
47 | { | |
48 | int ret = 0; | |
49 | ||
50 | if (p) { | |
51 | if (bind) | |
52 | p->tcfc_bindcnt--; | |
53 | ||
54 | p->tcfc_refcnt--; | |
10297b99 | 55 | if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) { |
e9ce1cd3 DM |
56 | tcf_hash_destroy(p, hinfo); |
57 | ret = 1; | |
58 | } | |
59 | } | |
60 | return ret; | |
61 | } | |
62 | EXPORT_SYMBOL(tcf_hash_release); | |
63 | ||
64 | static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
65 | struct tc_action *a, struct tcf_hashinfo *hinfo) | |
66 | { | |
67 | struct tcf_common *p; | |
68 | int err = 0, index = -1,i = 0, s_i = 0, n_i = 0; | |
69 | struct rtattr *r ; | |
70 | ||
71 | read_lock(hinfo->lock); | |
72 | ||
73 | s_i = cb->args[0]; | |
74 | ||
75 | for (i = 0; i < (hinfo->hmask + 1); i++) { | |
76 | p = hinfo->htab[tcf_hash(i, hinfo->hmask)]; | |
77 | ||
78 | for (; p; p = p->tcfc_next) { | |
79 | index++; | |
80 | if (index < s_i) | |
81 | continue; | |
82 | a->priv = p; | |
83 | a->order = n_i; | |
27a884dc | 84 | r = (struct rtattr *)skb_tail_pointer(skb); |
e9ce1cd3 DM |
85 | RTA_PUT(skb, a->order, 0, NULL); |
86 | err = tcf_action_dump_1(skb, a, 0, 0); | |
87 | if (err < 0) { | |
88 | index--; | |
dc5fc579 | 89 | nlmsg_trim(skb, r); |
e9ce1cd3 DM |
90 | goto done; |
91 | } | |
27a884dc | 92 | r->rta_len = skb_tail_pointer(skb) - (u8 *)r; |
e9ce1cd3 DM |
93 | n_i++; |
94 | if (n_i >= TCA_ACT_MAX_PRIO) | |
95 | goto done; | |
96 | } | |
97 | } | |
98 | done: | |
99 | read_unlock(hinfo->lock); | |
100 | if (n_i) | |
101 | cb->args[0] += n_i; | |
102 | return n_i; | |
103 | ||
104 | rtattr_failure: | |
dc5fc579 | 105 | nlmsg_trim(skb, r); |
e9ce1cd3 DM |
106 | goto done; |
107 | } | |
108 | ||
109 | static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a, | |
110 | struct tcf_hashinfo *hinfo) | |
111 | { | |
112 | struct tcf_common *p, *s_p; | |
113 | struct rtattr *r ; | |
114 | int i= 0, n_i = 0; | |
115 | ||
27a884dc | 116 | r = (struct rtattr *)skb_tail_pointer(skb); |
e9ce1cd3 DM |
117 | RTA_PUT(skb, a->order, 0, NULL); |
118 | RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind); | |
119 | for (i = 0; i < (hinfo->hmask + 1); i++) { | |
120 | p = hinfo->htab[tcf_hash(i, hinfo->hmask)]; | |
121 | ||
122 | while (p != NULL) { | |
123 | s_p = p->tcfc_next; | |
124 | if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo)) | |
125 | module_put(a->ops->owner); | |
126 | n_i++; | |
127 | p = s_p; | |
128 | } | |
129 | } | |
130 | RTA_PUT(skb, TCA_FCNT, 4, &n_i); | |
27a884dc | 131 | r->rta_len = skb_tail_pointer(skb) - (u8 *)r; |
e9ce1cd3 DM |
132 | |
133 | return n_i; | |
134 | rtattr_failure: | |
dc5fc579 | 135 | nlmsg_trim(skb, r); |
e9ce1cd3 DM |
136 | return -EINVAL; |
137 | } | |
138 | ||
139 | int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
140 | int type, struct tc_action *a) | |
141 | { | |
142 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
143 | ||
144 | if (type == RTM_DELACTION) { | |
145 | return tcf_del_walker(skb, a, hinfo); | |
146 | } else if (type == RTM_GETACTION) { | |
147 | return tcf_dump_walker(skb, cb, a, hinfo); | |
148 | } else { | |
149 | printk("tcf_generic_walker: unknown action %d\n", type); | |
150 | return -EINVAL; | |
151 | } | |
152 | } | |
153 | EXPORT_SYMBOL(tcf_generic_walker); | |
154 | ||
155 | struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo) | |
156 | { | |
157 | struct tcf_common *p; | |
158 | ||
159 | read_lock(hinfo->lock); | |
160 | for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p; | |
161 | p = p->tcfc_next) { | |
162 | if (p->tcfc_index == index) | |
163 | break; | |
164 | } | |
165 | read_unlock(hinfo->lock); | |
166 | ||
167 | return p; | |
168 | } | |
169 | EXPORT_SYMBOL(tcf_hash_lookup); | |
170 | ||
171 | u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo) | |
172 | { | |
173 | u32 val = *idx_gen; | |
174 | ||
175 | do { | |
176 | if (++val == 0) | |
177 | val = 1; | |
178 | } while (tcf_hash_lookup(val, hinfo)); | |
179 | ||
180 | return (*idx_gen = val); | |
181 | } | |
182 | EXPORT_SYMBOL(tcf_hash_new_index); | |
183 | ||
184 | int tcf_hash_search(struct tc_action *a, u32 index) | |
185 | { | |
186 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
187 | struct tcf_common *p = tcf_hash_lookup(index, hinfo); | |
188 | ||
189 | if (p) { | |
190 | a->priv = p; | |
191 | return 1; | |
192 | } | |
193 | return 0; | |
194 | } | |
195 | EXPORT_SYMBOL(tcf_hash_search); | |
196 | ||
197 | struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind, | |
198 | struct tcf_hashinfo *hinfo) | |
199 | { | |
200 | struct tcf_common *p = NULL; | |
201 | if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) { | |
202 | if (bind) { | |
203 | p->tcfc_bindcnt++; | |
204 | p->tcfc_refcnt++; | |
205 | } | |
206 | a->priv = p; | |
207 | } | |
208 | return p; | |
209 | } | |
210 | EXPORT_SYMBOL(tcf_hash_check); | |
211 | ||
212 | struct tcf_common *tcf_hash_create(u32 index, struct rtattr *est, struct tc_action *a, int size, int bind, u32 *idx_gen, struct tcf_hashinfo *hinfo) | |
213 | { | |
214 | struct tcf_common *p = kzalloc(size, GFP_KERNEL); | |
215 | ||
216 | if (unlikely(!p)) | |
217 | return p; | |
218 | p->tcfc_refcnt = 1; | |
219 | if (bind) | |
220 | p->tcfc_bindcnt = 1; | |
221 | ||
222 | spin_lock_init(&p->tcfc_lock); | |
e9ce1cd3 DM |
223 | p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo); |
224 | p->tcfc_tm.install = jiffies; | |
225 | p->tcfc_tm.lastuse = jiffies; | |
e9ce1cd3 DM |
226 | if (est) |
227 | gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est, | |
4bdf3991 | 228 | &p->tcfc_lock, est); |
e9ce1cd3 DM |
229 | a->priv = (void *) p; |
230 | return p; | |
231 | } | |
232 | EXPORT_SYMBOL(tcf_hash_create); | |
233 | ||
234 | void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo) | |
235 | { | |
236 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); | |
237 | ||
238 | write_lock_bh(hinfo->lock); | |
239 | p->tcfc_next = hinfo->htab[h]; | |
240 | hinfo->htab[h] = p; | |
241 | write_unlock_bh(hinfo->lock); | |
242 | } | |
243 | EXPORT_SYMBOL(tcf_hash_insert); | |
1da177e4 LT |
244 | |
245 | static struct tc_action_ops *act_base = NULL; | |
246 | static DEFINE_RWLOCK(act_mod_lock); | |
247 | ||
248 | int tcf_register_action(struct tc_action_ops *act) | |
249 | { | |
250 | struct tc_action_ops *a, **ap; | |
251 | ||
252 | write_lock(&act_mod_lock); | |
253 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) { | |
254 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { | |
255 | write_unlock(&act_mod_lock); | |
256 | return -EEXIST; | |
257 | } | |
258 | } | |
259 | act->next = NULL; | |
260 | *ap = act; | |
261 | write_unlock(&act_mod_lock); | |
262 | return 0; | |
263 | } | |
264 | ||
265 | int tcf_unregister_action(struct tc_action_ops *act) | |
266 | { | |
267 | struct tc_action_ops *a, **ap; | |
268 | int err = -ENOENT; | |
269 | ||
270 | write_lock(&act_mod_lock); | |
271 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) | |
272 | if (a == act) | |
273 | break; | |
274 | if (a) { | |
275 | *ap = a->next; | |
276 | a->next = NULL; | |
277 | err = 0; | |
278 | } | |
279 | write_unlock(&act_mod_lock); | |
280 | return err; | |
281 | } | |
282 | ||
283 | /* lookup by name */ | |
284 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
285 | { | |
286 | struct tc_action_ops *a = NULL; | |
287 | ||
288 | if (kind) { | |
289 | read_lock(&act_mod_lock); | |
290 | for (a = act_base; a; a = a->next) { | |
291 | if (strcmp(kind, a->kind) == 0) { | |
292 | if (!try_module_get(a->owner)) { | |
293 | read_unlock(&act_mod_lock); | |
294 | return NULL; | |
295 | } | |
296 | break; | |
297 | } | |
298 | } | |
299 | read_unlock(&act_mod_lock); | |
300 | } | |
301 | return a; | |
302 | } | |
303 | ||
304 | /* lookup by rtattr */ | |
305 | static struct tc_action_ops *tc_lookup_action(struct rtattr *kind) | |
306 | { | |
307 | struct tc_action_ops *a = NULL; | |
308 | ||
309 | if (kind) { | |
310 | read_lock(&act_mod_lock); | |
311 | for (a = act_base; a; a = a->next) { | |
312 | if (rtattr_strcmp(kind, a->kind) == 0) { | |
313 | if (!try_module_get(a->owner)) { | |
314 | read_unlock(&act_mod_lock); | |
315 | return NULL; | |
316 | } | |
317 | break; | |
318 | } | |
319 | } | |
320 | read_unlock(&act_mod_lock); | |
321 | } | |
322 | return a; | |
323 | } | |
324 | ||
325 | #if 0 | |
326 | /* lookup by id */ | |
327 | static struct tc_action_ops *tc_lookup_action_id(u32 type) | |
328 | { | |
329 | struct tc_action_ops *a = NULL; | |
330 | ||
331 | if (type) { | |
332 | read_lock(&act_mod_lock); | |
333 | for (a = act_base; a; a = a->next) { | |
334 | if (a->type == type) { | |
335 | if (!try_module_get(a->owner)) { | |
336 | read_unlock(&act_mod_lock); | |
337 | return NULL; | |
338 | } | |
339 | break; | |
340 | } | |
341 | } | |
342 | read_unlock(&act_mod_lock); | |
343 | } | |
344 | return a; | |
345 | } | |
346 | #endif | |
347 | ||
348 | int tcf_action_exec(struct sk_buff *skb, struct tc_action *act, | |
10297b99 | 349 | struct tcf_result *res) |
1da177e4 LT |
350 | { |
351 | struct tc_action *a; | |
352 | int ret = -1; | |
353 | ||
354 | if (skb->tc_verd & TC_NCLS) { | |
355 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
1da177e4 LT |
356 | ret = TC_ACT_OK; |
357 | goto exec_done; | |
358 | } | |
359 | while ((a = act) != NULL) { | |
360 | repeat: | |
361 | if (a->ops && a->ops->act) { | |
f43c5a0d | 362 | ret = a->ops->act(skb, a, res); |
1da177e4 LT |
363 | if (TC_MUNGED & skb->tc_verd) { |
364 | /* copied already, allow trampling */ | |
365 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); | |
366 | skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd); | |
367 | } | |
1da177e4 LT |
368 | if (ret == TC_ACT_REPEAT) |
369 | goto repeat; /* we need a ttl - JHS */ | |
14d50e78 HS |
370 | if (ret != TC_ACT_PIPE) |
371 | goto exec_done; | |
1da177e4 LT |
372 | } |
373 | act = a->next; | |
374 | } | |
375 | exec_done: | |
1da177e4 LT |
376 | return ret; |
377 | } | |
378 | ||
379 | void tcf_action_destroy(struct tc_action *act, int bind) | |
380 | { | |
381 | struct tc_action *a; | |
382 | ||
383 | for (a = act; a; a = act) { | |
384 | if (a->ops && a->ops->cleanup) { | |
1da177e4 LT |
385 | if (a->ops->cleanup(a, bind) == ACT_P_DELETED) |
386 | module_put(a->ops->owner); | |
387 | act = act->next; | |
388 | kfree(a); | |
389 | } else { /*FIXME: Remove later - catch insertion bugs*/ | |
390 | printk("tcf_action_destroy: BUG? destroying NULL ops\n"); | |
391 | act = act->next; | |
392 | kfree(a); | |
393 | } | |
394 | } | |
395 | } | |
396 | ||
397 | int | |
398 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
399 | { | |
400 | int err = -EINVAL; | |
401 | ||
402 | if (a->ops == NULL || a->ops->dump == NULL) | |
403 | return err; | |
404 | return a->ops->dump(skb, a, bind, ref); | |
405 | } | |
406 | ||
407 | int | |
408 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
409 | { | |
410 | int err = -EINVAL; | |
27a884dc | 411 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
412 | struct rtattr *r; |
413 | ||
414 | if (a->ops == NULL || a->ops->dump == NULL) | |
415 | return err; | |
416 | ||
417 | RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind); | |
418 | if (tcf_action_copy_stats(skb, a, 0)) | |
419 | goto rtattr_failure; | |
27a884dc | 420 | r = (struct rtattr *)skb_tail_pointer(skb); |
1da177e4 LT |
421 | RTA_PUT(skb, TCA_OPTIONS, 0, NULL); |
422 | if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) { | |
27a884dc | 423 | r->rta_len = skb_tail_pointer(skb) - (u8 *)r; |
1da177e4 LT |
424 | return err; |
425 | } | |
426 | ||
427 | rtattr_failure: | |
dc5fc579 | 428 | nlmsg_trim(skb, b); |
1da177e4 LT |
429 | return -1; |
430 | } | |
431 | ||
432 | int | |
433 | tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref) | |
434 | { | |
435 | struct tc_action *a; | |
436 | int err = -EINVAL; | |
27a884dc | 437 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
438 | struct rtattr *r ; |
439 | ||
440 | while ((a = act) != NULL) { | |
27a884dc | 441 | r = (struct rtattr *)skb_tail_pointer(skb); |
1da177e4 LT |
442 | act = a->next; |
443 | RTA_PUT(skb, a->order, 0, NULL); | |
444 | err = tcf_action_dump_1(skb, a, bind, ref); | |
445 | if (err < 0) | |
4fe683f5 | 446 | goto errout; |
27a884dc | 447 | r->rta_len = skb_tail_pointer(skb) - (u8 *)r; |
1da177e4 LT |
448 | } |
449 | ||
450 | return 0; | |
451 | ||
452 | rtattr_failure: | |
4fe683f5 TG |
453 | err = -EINVAL; |
454 | errout: | |
dc5fc579 | 455 | nlmsg_trim(skb, b); |
4fe683f5 | 456 | return err; |
1da177e4 LT |
457 | } |
458 | ||
459 | struct tc_action *tcf_action_init_1(struct rtattr *rta, struct rtattr *est, | |
10297b99 | 460 | char *name, int ovr, int bind, int *err) |
1da177e4 LT |
461 | { |
462 | struct tc_action *a; | |
463 | struct tc_action_ops *a_o; | |
464 | char act_name[IFNAMSIZ]; | |
465 | struct rtattr *tb[TCA_ACT_MAX+1]; | |
466 | struct rtattr *kind; | |
467 | ||
468 | *err = -EINVAL; | |
469 | ||
470 | if (name == NULL) { | |
471 | if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0) | |
472 | goto err_out; | |
473 | kind = tb[TCA_ACT_KIND-1]; | |
474 | if (kind == NULL) | |
475 | goto err_out; | |
476 | if (rtattr_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) | |
477 | goto err_out; | |
478 | } else { | |
479 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) | |
480 | goto err_out; | |
481 | } | |
482 | ||
483 | a_o = tc_lookup_action_n(act_name); | |
484 | if (a_o == NULL) { | |
485 | #ifdef CONFIG_KMOD | |
486 | rtnl_unlock(); | |
4bba3925 | 487 | request_module("act_%s", act_name); |
1da177e4 LT |
488 | rtnl_lock(); |
489 | ||
490 | a_o = tc_lookup_action_n(act_name); | |
491 | ||
492 | /* We dropped the RTNL semaphore in order to | |
493 | * perform the module load. So, even if we | |
494 | * succeeded in loading the module we have to | |
495 | * tell the caller to replay the request. We | |
496 | * indicate this using -EAGAIN. | |
497 | */ | |
498 | if (a_o != NULL) { | |
499 | *err = -EAGAIN; | |
500 | goto err_mod; | |
501 | } | |
502 | #endif | |
d152b4e1 | 503 | *err = -ENOENT; |
1da177e4 LT |
504 | goto err_out; |
505 | } | |
506 | ||
507 | *err = -ENOMEM; | |
0da974f4 | 508 | a = kzalloc(sizeof(*a), GFP_KERNEL); |
1da177e4 LT |
509 | if (a == NULL) |
510 | goto err_mod; | |
1da177e4 LT |
511 | |
512 | /* backward compatibility for policer */ | |
513 | if (name == NULL) | |
514 | *err = a_o->init(tb[TCA_ACT_OPTIONS-1], est, a, ovr, bind); | |
515 | else | |
516 | *err = a_o->init(rta, est, a, ovr, bind); | |
517 | if (*err < 0) | |
518 | goto err_free; | |
519 | ||
520 | /* module count goes up only when brand new policy is created | |
521 | if it exists and is only bound to in a_o->init() then | |
522 | ACT_P_CREATED is not returned (a zero is). | |
523 | */ | |
524 | if (*err != ACT_P_CREATED) | |
525 | module_put(a_o->owner); | |
526 | a->ops = a_o; | |
1da177e4 LT |
527 | |
528 | *err = 0; | |
529 | return a; | |
530 | ||
531 | err_free: | |
532 | kfree(a); | |
533 | err_mod: | |
534 | module_put(a_o->owner); | |
535 | err_out: | |
536 | return NULL; | |
537 | } | |
538 | ||
539 | struct tc_action *tcf_action_init(struct rtattr *rta, struct rtattr *est, | |
10297b99 | 540 | char *name, int ovr, int bind, int *err) |
1da177e4 LT |
541 | { |
542 | struct rtattr *tb[TCA_ACT_MAX_PRIO+1]; | |
543 | struct tc_action *head = NULL, *act, *act_prev = NULL; | |
544 | int i; | |
545 | ||
546 | if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0) { | |
547 | *err = -EINVAL; | |
548 | return head; | |
549 | } | |
550 | ||
551 | for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) { | |
552 | act = tcf_action_init_1(tb[i], est, name, ovr, bind, err); | |
553 | if (act == NULL) | |
554 | goto err; | |
555 | act->order = i+1; | |
556 | ||
557 | if (head == NULL) | |
558 | head = act; | |
559 | else | |
560 | act_prev->next = act; | |
561 | act_prev = act; | |
562 | } | |
563 | return head; | |
564 | ||
565 | err: | |
566 | if (head != NULL) | |
567 | tcf_action_destroy(head, bind); | |
568 | return NULL; | |
569 | } | |
570 | ||
571 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a, | |
572 | int compat_mode) | |
573 | { | |
574 | int err = 0; | |
575 | struct gnet_dump d; | |
576 | struct tcf_act_hdr *h = a->priv; | |
10297b99 | 577 | |
1da177e4 LT |
578 | if (h == NULL) |
579 | goto errout; | |
580 | ||
581 | /* compat_mode being true specifies a call that is supposed | |
582 | * to add additional backward compatiblity statistic TLVs. | |
583 | */ | |
584 | if (compat_mode) { | |
585 | if (a->type == TCA_OLD_COMPAT) | |
586 | err = gnet_stats_start_copy_compat(skb, 0, | |
4bdf3991 | 587 | TCA_STATS, TCA_XSTATS, &h->tcf_lock, &d); |
1da177e4 LT |
588 | else |
589 | return 0; | |
590 | } else | |
591 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
4bdf3991 | 592 | &h->tcf_lock, &d); |
1da177e4 LT |
593 | |
594 | if (err < 0) | |
595 | goto errout; | |
596 | ||
597 | if (a->ops != NULL && a->ops->get_stats != NULL) | |
598 | if (a->ops->get_stats(skb, a) < 0) | |
599 | goto errout; | |
600 | ||
e9ce1cd3 | 601 | if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 || |
e9ce1cd3 | 602 | gnet_stats_copy_rate_est(&d, &h->tcf_rate_est) < 0 || |
e9ce1cd3 | 603 | gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0) |
1da177e4 LT |
604 | goto errout; |
605 | ||
606 | if (gnet_stats_finish_copy(&d) < 0) | |
607 | goto errout; | |
608 | ||
609 | return 0; | |
610 | ||
611 | errout: | |
612 | return -1; | |
613 | } | |
614 | ||
615 | static int | |
616 | tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq, | |
10297b99 | 617 | u16 flags, int event, int bind, int ref) |
1da177e4 LT |
618 | { |
619 | struct tcamsg *t; | |
620 | struct nlmsghdr *nlh; | |
27a884dc | 621 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
622 | struct rtattr *x; |
623 | ||
e431b8c0 JHS |
624 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
625 | ||
1da177e4 LT |
626 | t = NLMSG_DATA(nlh); |
627 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
628 | t->tca__pad1 = 0; |
629 | t->tca__pad2 = 0; | |
10297b99 | 630 | |
27a884dc | 631 | x = (struct rtattr *)skb_tail_pointer(skb); |
1da177e4 LT |
632 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); |
633 | ||
634 | if (tcf_action_dump(skb, a, bind, ref) < 0) | |
635 | goto rtattr_failure; | |
636 | ||
27a884dc | 637 | x->rta_len = skb_tail_pointer(skb) - (u8 *)x; |
10297b99 | 638 | |
27a884dc | 639 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
640 | return skb->len; |
641 | ||
642 | rtattr_failure: | |
643 | nlmsg_failure: | |
dc5fc579 | 644 | nlmsg_trim(skb, b); |
1da177e4 LT |
645 | return -1; |
646 | } | |
647 | ||
648 | static int | |
649 | act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event) | |
650 | { | |
651 | struct sk_buff *skb; | |
1da177e4 LT |
652 | |
653 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
654 | if (!skb) | |
655 | return -ENOBUFS; | |
656 | if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { | |
657 | kfree_skb(skb); | |
658 | return -EINVAL; | |
659 | } | |
2942e900 TG |
660 | |
661 | return rtnl_unicast(skb, pid); | |
1da177e4 LT |
662 | } |
663 | ||
664 | static struct tc_action * | |
665 | tcf_action_get_1(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int *err) | |
666 | { | |
667 | struct rtattr *tb[TCA_ACT_MAX+1]; | |
668 | struct tc_action *a; | |
669 | int index; | |
670 | ||
671 | *err = -EINVAL; | |
672 | if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0) | |
673 | return NULL; | |
674 | ||
675 | if (tb[TCA_ACT_INDEX - 1] == NULL || | |
676 | RTA_PAYLOAD(tb[TCA_ACT_INDEX - 1]) < sizeof(index)) | |
677 | return NULL; | |
678 | index = *(int *)RTA_DATA(tb[TCA_ACT_INDEX - 1]); | |
679 | ||
680 | *err = -ENOMEM; | |
0da974f4 | 681 | a = kzalloc(sizeof(struct tc_action), GFP_KERNEL); |
1da177e4 LT |
682 | if (a == NULL) |
683 | return NULL; | |
1da177e4 LT |
684 | |
685 | *err = -EINVAL; | |
686 | a->ops = tc_lookup_action(tb[TCA_ACT_KIND - 1]); | |
687 | if (a->ops == NULL) | |
688 | goto err_free; | |
689 | if (a->ops->lookup == NULL) | |
690 | goto err_mod; | |
691 | *err = -ENOENT; | |
692 | if (a->ops->lookup(a, index) == 0) | |
693 | goto err_mod; | |
694 | ||
695 | module_put(a->ops->owner); | |
696 | *err = 0; | |
697 | return a; | |
698 | err_mod: | |
699 | module_put(a->ops->owner); | |
700 | err_free: | |
701 | kfree(a); | |
702 | return NULL; | |
703 | } | |
704 | ||
705 | static void cleanup_a(struct tc_action *act) | |
706 | { | |
707 | struct tc_action *a; | |
708 | ||
709 | for (a = act; a; a = act) { | |
710 | act = a->next; | |
711 | kfree(a); | |
712 | } | |
713 | } | |
714 | ||
715 | static struct tc_action *create_a(int i) | |
716 | { | |
717 | struct tc_action *act; | |
718 | ||
0da974f4 | 719 | act = kzalloc(sizeof(*act), GFP_KERNEL); |
1da177e4 LT |
720 | if (act == NULL) { |
721 | printk("create_a: failed to alloc!\n"); | |
722 | return NULL; | |
723 | } | |
1da177e4 LT |
724 | act->order = i; |
725 | return act; | |
726 | } | |
727 | ||
728 | static int tca_action_flush(struct rtattr *rta, struct nlmsghdr *n, u32 pid) | |
729 | { | |
730 | struct sk_buff *skb; | |
731 | unsigned char *b; | |
732 | struct nlmsghdr *nlh; | |
733 | struct tcamsg *t; | |
734 | struct netlink_callback dcb; | |
735 | struct rtattr *x; | |
736 | struct rtattr *tb[TCA_ACT_MAX+1]; | |
737 | struct rtattr *kind; | |
738 | struct tc_action *a = create_a(0); | |
739 | int err = -EINVAL; | |
740 | ||
741 | if (a == NULL) { | |
742 | printk("tca_action_flush: couldnt create tc_action\n"); | |
743 | return err; | |
744 | } | |
745 | ||
746 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
747 | if (!skb) { | |
748 | printk("tca_action_flush: failed skb alloc\n"); | |
749 | kfree(a); | |
750 | return -ENOBUFS; | |
751 | } | |
752 | ||
27a884dc | 753 | b = skb_tail_pointer(skb); |
1da177e4 LT |
754 | |
755 | if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0) | |
756 | goto err_out; | |
757 | ||
758 | kind = tb[TCA_ACT_KIND-1]; | |
759 | a->ops = tc_lookup_action(kind); | |
760 | if (a->ops == NULL) | |
761 | goto err_out; | |
762 | ||
763 | nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t)); | |
764 | t = NLMSG_DATA(nlh); | |
765 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
766 | t->tca__pad1 = 0; |
767 | t->tca__pad2 = 0; | |
1da177e4 | 768 | |
27a884dc | 769 | x = (struct rtattr *)skb_tail_pointer(skb); |
1da177e4 LT |
770 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); |
771 | ||
772 | err = a->ops->walk(skb, &dcb, RTM_DELACTION, a); | |
773 | if (err < 0) | |
774 | goto rtattr_failure; | |
775 | ||
27a884dc | 776 | x->rta_len = skb_tail_pointer(skb) - (u8 *)x; |
1da177e4 | 777 | |
27a884dc | 778 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
779 | nlh->nlmsg_flags |= NLM_F_ROOT; |
780 | module_put(a->ops->owner); | |
781 | kfree(a); | |
ac6d439d | 782 | err = rtnetlink_send(skb, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
783 | if (err > 0) |
784 | return 0; | |
785 | ||
786 | return err; | |
787 | ||
788 | rtattr_failure: | |
1da177e4 | 789 | nlmsg_failure: |
ebbaeab1 | 790 | module_put(a->ops->owner); |
1da177e4 LT |
791 | err_out: |
792 | kfree_skb(skb); | |
793 | kfree(a); | |
794 | return err; | |
795 | } | |
796 | ||
797 | static int | |
798 | tca_action_gd(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int event) | |
799 | { | |
800 | int i, ret = 0; | |
801 | struct rtattr *tb[TCA_ACT_MAX_PRIO+1]; | |
802 | struct tc_action *head = NULL, *act, *act_prev = NULL; | |
803 | ||
804 | if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0) | |
805 | return -EINVAL; | |
806 | ||
807 | if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) { | |
808 | if (tb[0] != NULL && tb[1] == NULL) | |
809 | return tca_action_flush(tb[0], n, pid); | |
810 | } | |
811 | ||
812 | for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) { | |
813 | act = tcf_action_get_1(tb[i], n, pid, &ret); | |
814 | if (act == NULL) | |
815 | goto err; | |
816 | act->order = i+1; | |
817 | ||
818 | if (head == NULL) | |
819 | head = act; | |
820 | else | |
821 | act_prev->next = act; | |
822 | act_prev = act; | |
823 | } | |
824 | ||
825 | if (event == RTM_GETACTION) | |
826 | ret = act_get_notify(pid, n, head, event); | |
827 | else { /* delete */ | |
828 | struct sk_buff *skb; | |
829 | ||
830 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
831 | if (!skb) { | |
832 | ret = -ENOBUFS; | |
833 | goto err; | |
834 | } | |
835 | ||
836 | if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event, | |
10297b99 | 837 | 0, 1) <= 0) { |
1da177e4 LT |
838 | kfree_skb(skb); |
839 | ret = -EINVAL; | |
840 | goto err; | |
841 | } | |
842 | ||
843 | /* now do the delete */ | |
844 | tcf_action_destroy(head, 0); | |
ac6d439d | 845 | ret = rtnetlink_send(skb, pid, RTNLGRP_TC, |
10297b99 | 846 | n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
847 | if (ret > 0) |
848 | return 0; | |
849 | return ret; | |
850 | } | |
851 | err: | |
852 | cleanup_a(head); | |
853 | return ret; | |
854 | } | |
855 | ||
856 | static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event, | |
10297b99 | 857 | u16 flags) |
1da177e4 LT |
858 | { |
859 | struct tcamsg *t; | |
860 | struct nlmsghdr *nlh; | |
861 | struct sk_buff *skb; | |
862 | struct rtattr *x; | |
863 | unsigned char *b; | |
864 | int err = 0; | |
865 | ||
866 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
867 | if (!skb) | |
868 | return -ENOBUFS; | |
869 | ||
27a884dc | 870 | b = skb_tail_pointer(skb); |
1da177e4 | 871 | |
e431b8c0 | 872 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
1da177e4 LT |
873 | t = NLMSG_DATA(nlh); |
874 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
875 | t->tca__pad1 = 0; |
876 | t->tca__pad2 = 0; | |
877 | ||
27a884dc | 878 | x = (struct rtattr *)skb_tail_pointer(skb); |
1da177e4 LT |
879 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); |
880 | ||
881 | if (tcf_action_dump(skb, a, 0, 0) < 0) | |
882 | goto rtattr_failure; | |
883 | ||
27a884dc | 884 | x->rta_len = skb_tail_pointer(skb) - (u8 *)x; |
10297b99 | 885 | |
27a884dc | 886 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
ac6d439d | 887 | NETLINK_CB(skb).dst_group = RTNLGRP_TC; |
10297b99 | 888 | |
ac6d439d | 889 | err = rtnetlink_send(skb, pid, RTNLGRP_TC, flags&NLM_F_ECHO); |
1da177e4 LT |
890 | if (err > 0) |
891 | err = 0; | |
892 | return err; | |
893 | ||
894 | rtattr_failure: | |
895 | nlmsg_failure: | |
f6e57464 | 896 | kfree_skb(skb); |
1da177e4 LT |
897 | return -1; |
898 | } | |
899 | ||
10297b99 | 900 | |
1da177e4 LT |
901 | static int |
902 | tcf_action_add(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int ovr) | |
903 | { | |
904 | int ret = 0; | |
905 | struct tc_action *act; | |
906 | struct tc_action *a; | |
907 | u32 seq = n->nlmsg_seq; | |
908 | ||
909 | act = tcf_action_init(rta, NULL, NULL, ovr, 0, &ret); | |
910 | if (act == NULL) | |
911 | goto done; | |
912 | ||
913 | /* dump then free all the actions after update; inserted policy | |
914 | * stays intact | |
915 | * */ | |
916 | ret = tcf_add_notify(act, pid, seq, RTM_NEWACTION, n->nlmsg_flags); | |
917 | for (a = act; a; a = act) { | |
918 | act = a->next; | |
919 | kfree(a); | |
920 | } | |
921 | done: | |
922 | return ret; | |
923 | } | |
924 | ||
925 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
926 | { | |
927 | struct rtattr **tca = arg; | |
928 | u32 pid = skb ? NETLINK_CB(skb).pid : 0; | |
929 | int ret = 0, ovr = 0; | |
930 | ||
931 | if (tca[TCA_ACT_TAB-1] == NULL) { | |
932 | printk("tc_ctl_action: received NO action attribs\n"); | |
933 | return -EINVAL; | |
934 | } | |
935 | ||
936 | /* n->nlmsg_flags&NLM_F_CREATE | |
937 | * */ | |
938 | switch (n->nlmsg_type) { | |
939 | case RTM_NEWACTION: | |
940 | /* we are going to assume all other flags | |
941 | * imply create only if it doesnt exist | |
942 | * Note that CREATE | EXCL implies that | |
943 | * but since we want avoid ambiguity (eg when flags | |
944 | * is zero) then just set this | |
945 | */ | |
946 | if (n->nlmsg_flags&NLM_F_REPLACE) | |
947 | ovr = 1; | |
948 | replay: | |
949 | ret = tcf_action_add(tca[TCA_ACT_TAB-1], n, pid, ovr); | |
950 | if (ret == -EAGAIN) | |
951 | goto replay; | |
952 | break; | |
953 | case RTM_DELACTION: | |
954 | ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_DELACTION); | |
955 | break; | |
956 | case RTM_GETACTION: | |
957 | ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_GETACTION); | |
958 | break; | |
959 | default: | |
960 | BUG(); | |
961 | } | |
962 | ||
963 | return ret; | |
964 | } | |
965 | ||
26dab893 | 966 | static struct rtattr * |
1da177e4 LT |
967 | find_dump_kind(struct nlmsghdr *n) |
968 | { | |
969 | struct rtattr *tb1, *tb2[TCA_ACT_MAX+1]; | |
970 | struct rtattr *tb[TCA_ACT_MAX_PRIO + 1]; | |
971 | struct rtattr *rta[TCAA_MAX + 1]; | |
972 | struct rtattr *kind; | |
973 | int min_len = NLMSG_LENGTH(sizeof(struct tcamsg)); | |
974 | int attrlen = n->nlmsg_len - NLMSG_ALIGN(min_len); | |
975 | struct rtattr *attr = (void *) n + NLMSG_ALIGN(min_len); | |
976 | ||
977 | if (rtattr_parse(rta, TCAA_MAX, attr, attrlen) < 0) | |
978 | return NULL; | |
979 | tb1 = rta[TCA_ACT_TAB - 1]; | |
980 | if (tb1 == NULL) | |
981 | return NULL; | |
982 | ||
983 | if (rtattr_parse(tb, TCA_ACT_MAX_PRIO, RTA_DATA(tb1), | |
10297b99 | 984 | NLMSG_ALIGN(RTA_PAYLOAD(tb1))) < 0) |
1da177e4 LT |
985 | return NULL; |
986 | if (tb[0] == NULL) | |
987 | return NULL; | |
988 | ||
989 | if (rtattr_parse(tb2, TCA_ACT_MAX, RTA_DATA(tb[0]), | |
10297b99 | 990 | RTA_PAYLOAD(tb[0])) < 0) |
1da177e4 LT |
991 | return NULL; |
992 | kind = tb2[TCA_ACT_KIND-1]; | |
993 | ||
26dab893 | 994 | return kind; |
1da177e4 LT |
995 | } |
996 | ||
997 | static int | |
998 | tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) | |
999 | { | |
1000 | struct nlmsghdr *nlh; | |
27a884dc | 1001 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1002 | struct rtattr *x; |
1003 | struct tc_action_ops *a_o; | |
1004 | struct tc_action a; | |
1005 | int ret = 0; | |
1006 | struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh); | |
26dab893 | 1007 | struct rtattr *kind = find_dump_kind(cb->nlh); |
1da177e4 LT |
1008 | |
1009 | if (kind == NULL) { | |
1010 | printk("tc_dump_action: action bad kind\n"); | |
1011 | return 0; | |
1012 | } | |
1013 | ||
26dab893 | 1014 | a_o = tc_lookup_action(kind); |
1da177e4 | 1015 | if (a_o == NULL) { |
1da177e4 LT |
1016 | return 0; |
1017 | } | |
1018 | ||
1019 | memset(&a, 0, sizeof(struct tc_action)); | |
1020 | a.ops = a_o; | |
1021 | ||
1022 | if (a_o->walk == NULL) { | |
26dab893 | 1023 | printk("tc_dump_action: %s !capable of dumping table\n", a_o->kind); |
1da177e4 LT |
1024 | goto rtattr_failure; |
1025 | } | |
1026 | ||
1027 | nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, | |
10297b99 | 1028 | cb->nlh->nlmsg_type, sizeof(*t)); |
1da177e4 LT |
1029 | t = NLMSG_DATA(nlh); |
1030 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
1031 | t->tca__pad1 = 0; |
1032 | t->tca__pad2 = 0; | |
1da177e4 | 1033 | |
27a884dc | 1034 | x = (struct rtattr *)skb_tail_pointer(skb); |
1da177e4 LT |
1035 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); |
1036 | ||
1037 | ret = a_o->walk(skb, cb, RTM_GETACTION, &a); | |
1038 | if (ret < 0) | |
1039 | goto rtattr_failure; | |
1040 | ||
1041 | if (ret > 0) { | |
27a884dc | 1042 | x->rta_len = skb_tail_pointer(skb) - (u8 *)x; |
1da177e4 LT |
1043 | ret = skb->len; |
1044 | } else | |
dc5fc579 | 1045 | nlmsg_trim(skb, x); |
1da177e4 | 1046 | |
27a884dc | 1047 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1048 | if (NETLINK_CB(cb->skb).pid && ret) |
1049 | nlh->nlmsg_flags |= NLM_F_MULTI; | |
1050 | module_put(a_o->owner); | |
1051 | return skb->len; | |
1052 | ||
1053 | rtattr_failure: | |
1054 | nlmsg_failure: | |
1055 | module_put(a_o->owner); | |
dc5fc579 | 1056 | nlmsg_trim(skb, b); |
1da177e4 LT |
1057 | return skb->len; |
1058 | } | |
1059 | ||
1060 | static int __init tc_action_init(void) | |
1061 | { | |
708914cc TG |
1062 | rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL); |
1063 | rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL); | |
1064 | rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action); | |
1da177e4 | 1065 | |
1da177e4 LT |
1066 | return 0; |
1067 | } | |
1068 | ||
1069 | subsys_initcall(tc_action_init); | |
1070 | ||
1071 | EXPORT_SYMBOL(tcf_register_action); | |
1072 | EXPORT_SYMBOL(tcf_unregister_action); | |
1073 | EXPORT_SYMBOL(tcf_action_exec); | |
1074 | EXPORT_SYMBOL(tcf_action_dump_1); |