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 | ||
14 | #include <asm/uaccess.h> | |
15 | #include <asm/system.h> | |
16 | #include <linux/bitops.h> | |
1da177e4 LT |
17 | #include <linux/types.h> |
18 | #include <linux/kernel.h> | |
1da177e4 LT |
19 | #include <linux/string.h> |
20 | #include <linux/mm.h> | |
21 | #include <linux/socket.h> | |
22 | #include <linux/sockios.h> | |
23 | #include <linux/in.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/netdevice.h> | |
27 | #include <linux/skbuff.h> | |
28 | #include <linux/rtnetlink.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/kmod.h> | |
31 | #include <net/sock.h> | |
32 | #include <net/sch_generic.h> | |
33 | #include <net/act_api.h> | |
34 | ||
e9ce1cd3 DM |
35 | void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo) |
36 | { | |
37 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); | |
38 | struct tcf_common **p1p; | |
39 | ||
40 | for (p1p = &hinfo->htab[h]; *p1p; p1p = &(*p1p)->tcfc_next) { | |
41 | if (*p1p == p) { | |
42 | write_lock_bh(hinfo->lock); | |
43 | *p1p = p->tcfc_next; | |
44 | write_unlock_bh(hinfo->lock); | |
45 | #ifdef CONFIG_NET_ESTIMATOR | |
46 | gen_kill_estimator(&p->tcfc_bstats, | |
47 | &p->tcfc_rate_est); | |
1da177e4 | 48 | #endif |
e9ce1cd3 DM |
49 | kfree(p); |
50 | return; | |
51 | } | |
52 | } | |
53 | BUG_TRAP(0); | |
54 | } | |
55 | EXPORT_SYMBOL(tcf_hash_destroy); | |
56 | ||
57 | int tcf_hash_release(struct tcf_common *p, int bind, | |
58 | struct tcf_hashinfo *hinfo) | |
59 | { | |
60 | int ret = 0; | |
61 | ||
62 | if (p) { | |
63 | if (bind) | |
64 | p->tcfc_bindcnt--; | |
65 | ||
66 | p->tcfc_refcnt--; | |
10297b99 | 67 | if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) { |
e9ce1cd3 DM |
68 | tcf_hash_destroy(p, hinfo); |
69 | ret = 1; | |
70 | } | |
71 | } | |
72 | return ret; | |
73 | } | |
74 | EXPORT_SYMBOL(tcf_hash_release); | |
75 | ||
76 | static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
77 | struct tc_action *a, struct tcf_hashinfo *hinfo) | |
78 | { | |
79 | struct tcf_common *p; | |
80 | int err = 0, index = -1,i = 0, s_i = 0, n_i = 0; | |
81 | struct rtattr *r ; | |
82 | ||
83 | read_lock(hinfo->lock); | |
84 | ||
85 | s_i = cb->args[0]; | |
86 | ||
87 | for (i = 0; i < (hinfo->hmask + 1); i++) { | |
88 | p = hinfo->htab[tcf_hash(i, hinfo->hmask)]; | |
89 | ||
90 | for (; p; p = p->tcfc_next) { | |
91 | index++; | |
92 | if (index < s_i) | |
93 | continue; | |
94 | a->priv = p; | |
95 | a->order = n_i; | |
27a884dc | 96 | r = (struct rtattr *)skb_tail_pointer(skb); |
e9ce1cd3 DM |
97 | RTA_PUT(skb, a->order, 0, NULL); |
98 | err = tcf_action_dump_1(skb, a, 0, 0); | |
99 | if (err < 0) { | |
100 | index--; | |
101 | skb_trim(skb, (u8*)r - skb->data); | |
102 | goto done; | |
103 | } | |
27a884dc | 104 | r->rta_len = skb_tail_pointer(skb) - (u8 *)r; |
e9ce1cd3 DM |
105 | n_i++; |
106 | if (n_i >= TCA_ACT_MAX_PRIO) | |
107 | goto done; | |
108 | } | |
109 | } | |
110 | done: | |
111 | read_unlock(hinfo->lock); | |
112 | if (n_i) | |
113 | cb->args[0] += n_i; | |
114 | return n_i; | |
115 | ||
116 | rtattr_failure: | |
117 | skb_trim(skb, (u8*)r - skb->data); | |
118 | goto done; | |
119 | } | |
120 | ||
121 | static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a, | |
122 | struct tcf_hashinfo *hinfo) | |
123 | { | |
124 | struct tcf_common *p, *s_p; | |
125 | struct rtattr *r ; | |
126 | int i= 0, n_i = 0; | |
127 | ||
27a884dc | 128 | r = (struct rtattr *)skb_tail_pointer(skb); |
e9ce1cd3 DM |
129 | RTA_PUT(skb, a->order, 0, NULL); |
130 | RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind); | |
131 | for (i = 0; i < (hinfo->hmask + 1); i++) { | |
132 | p = hinfo->htab[tcf_hash(i, hinfo->hmask)]; | |
133 | ||
134 | while (p != NULL) { | |
135 | s_p = p->tcfc_next; | |
136 | if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo)) | |
137 | module_put(a->ops->owner); | |
138 | n_i++; | |
139 | p = s_p; | |
140 | } | |
141 | } | |
142 | RTA_PUT(skb, TCA_FCNT, 4, &n_i); | |
27a884dc | 143 | r->rta_len = skb_tail_pointer(skb) - (u8 *)r; |
e9ce1cd3 DM |
144 | |
145 | return n_i; | |
146 | rtattr_failure: | |
147 | skb_trim(skb, (u8*)r - skb->data); | |
148 | return -EINVAL; | |
149 | } | |
150 | ||
151 | int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
152 | int type, struct tc_action *a) | |
153 | { | |
154 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
155 | ||
156 | if (type == RTM_DELACTION) { | |
157 | return tcf_del_walker(skb, a, hinfo); | |
158 | } else if (type == RTM_GETACTION) { | |
159 | return tcf_dump_walker(skb, cb, a, hinfo); | |
160 | } else { | |
161 | printk("tcf_generic_walker: unknown action %d\n", type); | |
162 | return -EINVAL; | |
163 | } | |
164 | } | |
165 | EXPORT_SYMBOL(tcf_generic_walker); | |
166 | ||
167 | struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo) | |
168 | { | |
169 | struct tcf_common *p; | |
170 | ||
171 | read_lock(hinfo->lock); | |
172 | for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p; | |
173 | p = p->tcfc_next) { | |
174 | if (p->tcfc_index == index) | |
175 | break; | |
176 | } | |
177 | read_unlock(hinfo->lock); | |
178 | ||
179 | return p; | |
180 | } | |
181 | EXPORT_SYMBOL(tcf_hash_lookup); | |
182 | ||
183 | u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo) | |
184 | { | |
185 | u32 val = *idx_gen; | |
186 | ||
187 | do { | |
188 | if (++val == 0) | |
189 | val = 1; | |
190 | } while (tcf_hash_lookup(val, hinfo)); | |
191 | ||
192 | return (*idx_gen = val); | |
193 | } | |
194 | EXPORT_SYMBOL(tcf_hash_new_index); | |
195 | ||
196 | int tcf_hash_search(struct tc_action *a, u32 index) | |
197 | { | |
198 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
199 | struct tcf_common *p = tcf_hash_lookup(index, hinfo); | |
200 | ||
201 | if (p) { | |
202 | a->priv = p; | |
203 | return 1; | |
204 | } | |
205 | return 0; | |
206 | } | |
207 | EXPORT_SYMBOL(tcf_hash_search); | |
208 | ||
209 | struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind, | |
210 | struct tcf_hashinfo *hinfo) | |
211 | { | |
212 | struct tcf_common *p = NULL; | |
213 | if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) { | |
214 | if (bind) { | |
215 | p->tcfc_bindcnt++; | |
216 | p->tcfc_refcnt++; | |
217 | } | |
218 | a->priv = p; | |
219 | } | |
220 | return p; | |
221 | } | |
222 | EXPORT_SYMBOL(tcf_hash_check); | |
223 | ||
224 | 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) | |
225 | { | |
226 | struct tcf_common *p = kzalloc(size, GFP_KERNEL); | |
227 | ||
228 | if (unlikely(!p)) | |
229 | return p; | |
230 | p->tcfc_refcnt = 1; | |
231 | if (bind) | |
232 | p->tcfc_bindcnt = 1; | |
233 | ||
234 | spin_lock_init(&p->tcfc_lock); | |
235 | p->tcfc_stats_lock = &p->tcfc_lock; | |
236 | p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo); | |
237 | p->tcfc_tm.install = jiffies; | |
238 | p->tcfc_tm.lastuse = jiffies; | |
239 | #ifdef CONFIG_NET_ESTIMATOR | |
240 | if (est) | |
241 | gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est, | |
242 | p->tcfc_stats_lock, est); | |
1da177e4 | 243 | #endif |
e9ce1cd3 DM |
244 | a->priv = (void *) p; |
245 | return p; | |
246 | } | |
247 | EXPORT_SYMBOL(tcf_hash_create); | |
248 | ||
249 | void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo) | |
250 | { | |
251 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); | |
252 | ||
253 | write_lock_bh(hinfo->lock); | |
254 | p->tcfc_next = hinfo->htab[h]; | |
255 | hinfo->htab[h] = p; | |
256 | write_unlock_bh(hinfo->lock); | |
257 | } | |
258 | EXPORT_SYMBOL(tcf_hash_insert); | |
1da177e4 LT |
259 | |
260 | static struct tc_action_ops *act_base = NULL; | |
261 | static DEFINE_RWLOCK(act_mod_lock); | |
262 | ||
263 | int tcf_register_action(struct tc_action_ops *act) | |
264 | { | |
265 | struct tc_action_ops *a, **ap; | |
266 | ||
267 | write_lock(&act_mod_lock); | |
268 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) { | |
269 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { | |
270 | write_unlock(&act_mod_lock); | |
271 | return -EEXIST; | |
272 | } | |
273 | } | |
274 | act->next = NULL; | |
275 | *ap = act; | |
276 | write_unlock(&act_mod_lock); | |
277 | return 0; | |
278 | } | |
279 | ||
280 | int tcf_unregister_action(struct tc_action_ops *act) | |
281 | { | |
282 | struct tc_action_ops *a, **ap; | |
283 | int err = -ENOENT; | |
284 | ||
285 | write_lock(&act_mod_lock); | |
286 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) | |
287 | if (a == act) | |
288 | break; | |
289 | if (a) { | |
290 | *ap = a->next; | |
291 | a->next = NULL; | |
292 | err = 0; | |
293 | } | |
294 | write_unlock(&act_mod_lock); | |
295 | return err; | |
296 | } | |
297 | ||
298 | /* lookup by name */ | |
299 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
300 | { | |
301 | struct tc_action_ops *a = NULL; | |
302 | ||
303 | if (kind) { | |
304 | read_lock(&act_mod_lock); | |
305 | for (a = act_base; a; a = a->next) { | |
306 | if (strcmp(kind, a->kind) == 0) { | |
307 | if (!try_module_get(a->owner)) { | |
308 | read_unlock(&act_mod_lock); | |
309 | return NULL; | |
310 | } | |
311 | break; | |
312 | } | |
313 | } | |
314 | read_unlock(&act_mod_lock); | |
315 | } | |
316 | return a; | |
317 | } | |
318 | ||
319 | /* lookup by rtattr */ | |
320 | static struct tc_action_ops *tc_lookup_action(struct rtattr *kind) | |
321 | { | |
322 | struct tc_action_ops *a = NULL; | |
323 | ||
324 | if (kind) { | |
325 | read_lock(&act_mod_lock); | |
326 | for (a = act_base; a; a = a->next) { | |
327 | if (rtattr_strcmp(kind, a->kind) == 0) { | |
328 | if (!try_module_get(a->owner)) { | |
329 | read_unlock(&act_mod_lock); | |
330 | return NULL; | |
331 | } | |
332 | break; | |
333 | } | |
334 | } | |
335 | read_unlock(&act_mod_lock); | |
336 | } | |
337 | return a; | |
338 | } | |
339 | ||
340 | #if 0 | |
341 | /* lookup by id */ | |
342 | static struct tc_action_ops *tc_lookup_action_id(u32 type) | |
343 | { | |
344 | struct tc_action_ops *a = NULL; | |
345 | ||
346 | if (type) { | |
347 | read_lock(&act_mod_lock); | |
348 | for (a = act_base; a; a = a->next) { | |
349 | if (a->type == type) { | |
350 | if (!try_module_get(a->owner)) { | |
351 | read_unlock(&act_mod_lock); | |
352 | return NULL; | |
353 | } | |
354 | break; | |
355 | } | |
356 | } | |
357 | read_unlock(&act_mod_lock); | |
358 | } | |
359 | return a; | |
360 | } | |
361 | #endif | |
362 | ||
363 | int tcf_action_exec(struct sk_buff *skb, struct tc_action *act, | |
10297b99 | 364 | struct tcf_result *res) |
1da177e4 LT |
365 | { |
366 | struct tc_action *a; | |
367 | int ret = -1; | |
368 | ||
369 | if (skb->tc_verd & TC_NCLS) { | |
370 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
1da177e4 LT |
371 | ret = TC_ACT_OK; |
372 | goto exec_done; | |
373 | } | |
374 | while ((a = act) != NULL) { | |
375 | repeat: | |
376 | if (a->ops && a->ops->act) { | |
f43c5a0d | 377 | ret = a->ops->act(skb, a, res); |
1da177e4 LT |
378 | if (TC_MUNGED & skb->tc_verd) { |
379 | /* copied already, allow trampling */ | |
380 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); | |
381 | skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd); | |
382 | } | |
1da177e4 LT |
383 | if (ret == TC_ACT_REPEAT) |
384 | goto repeat; /* we need a ttl - JHS */ | |
14d50e78 HS |
385 | if (ret != TC_ACT_PIPE) |
386 | goto exec_done; | |
1da177e4 LT |
387 | } |
388 | act = a->next; | |
389 | } | |
390 | exec_done: | |
1da177e4 LT |
391 | return ret; |
392 | } | |
393 | ||
394 | void tcf_action_destroy(struct tc_action *act, int bind) | |
395 | { | |
396 | struct tc_action *a; | |
397 | ||
398 | for (a = act; a; a = act) { | |
399 | if (a->ops && a->ops->cleanup) { | |
1da177e4 LT |
400 | if (a->ops->cleanup(a, bind) == ACT_P_DELETED) |
401 | module_put(a->ops->owner); | |
402 | act = act->next; | |
403 | kfree(a); | |
404 | } else { /*FIXME: Remove later - catch insertion bugs*/ | |
405 | printk("tcf_action_destroy: BUG? destroying NULL ops\n"); | |
406 | act = act->next; | |
407 | kfree(a); | |
408 | } | |
409 | } | |
410 | } | |
411 | ||
412 | int | |
413 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
414 | { | |
415 | int err = -EINVAL; | |
416 | ||
417 | if (a->ops == NULL || a->ops->dump == NULL) | |
418 | return err; | |
419 | return a->ops->dump(skb, a, bind, ref); | |
420 | } | |
421 | ||
422 | int | |
423 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
424 | { | |
425 | int err = -EINVAL; | |
27a884dc | 426 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
427 | struct rtattr *r; |
428 | ||
429 | if (a->ops == NULL || a->ops->dump == NULL) | |
430 | return err; | |
431 | ||
432 | RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind); | |
433 | if (tcf_action_copy_stats(skb, a, 0)) | |
434 | goto rtattr_failure; | |
27a884dc | 435 | r = (struct rtattr *)skb_tail_pointer(skb); |
1da177e4 LT |
436 | RTA_PUT(skb, TCA_OPTIONS, 0, NULL); |
437 | if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) { | |
27a884dc | 438 | r->rta_len = skb_tail_pointer(skb) - (u8 *)r; |
1da177e4 LT |
439 | return err; |
440 | } | |
441 | ||
442 | rtattr_failure: | |
443 | skb_trim(skb, b - skb->data); | |
444 | return -1; | |
445 | } | |
446 | ||
447 | int | |
448 | tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref) | |
449 | { | |
450 | struct tc_action *a; | |
451 | int err = -EINVAL; | |
27a884dc | 452 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
453 | struct rtattr *r ; |
454 | ||
455 | while ((a = act) != NULL) { | |
27a884dc | 456 | r = (struct rtattr *)skb_tail_pointer(skb); |
1da177e4 LT |
457 | act = a->next; |
458 | RTA_PUT(skb, a->order, 0, NULL); | |
459 | err = tcf_action_dump_1(skb, a, bind, ref); | |
460 | if (err < 0) | |
4fe683f5 | 461 | goto errout; |
27a884dc | 462 | r->rta_len = skb_tail_pointer(skb) - (u8 *)r; |
1da177e4 LT |
463 | } |
464 | ||
465 | return 0; | |
466 | ||
467 | rtattr_failure: | |
4fe683f5 TG |
468 | err = -EINVAL; |
469 | errout: | |
1da177e4 | 470 | skb_trim(skb, b - skb->data); |
4fe683f5 | 471 | return err; |
1da177e4 LT |
472 | } |
473 | ||
474 | struct tc_action *tcf_action_init_1(struct rtattr *rta, struct rtattr *est, | |
10297b99 | 475 | char *name, int ovr, int bind, int *err) |
1da177e4 LT |
476 | { |
477 | struct tc_action *a; | |
478 | struct tc_action_ops *a_o; | |
479 | char act_name[IFNAMSIZ]; | |
480 | struct rtattr *tb[TCA_ACT_MAX+1]; | |
481 | struct rtattr *kind; | |
482 | ||
483 | *err = -EINVAL; | |
484 | ||
485 | if (name == NULL) { | |
486 | if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0) | |
487 | goto err_out; | |
488 | kind = tb[TCA_ACT_KIND-1]; | |
489 | if (kind == NULL) | |
490 | goto err_out; | |
491 | if (rtattr_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) | |
492 | goto err_out; | |
493 | } else { | |
494 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) | |
495 | goto err_out; | |
496 | } | |
497 | ||
498 | a_o = tc_lookup_action_n(act_name); | |
499 | if (a_o == NULL) { | |
500 | #ifdef CONFIG_KMOD | |
501 | rtnl_unlock(); | |
4bba3925 | 502 | request_module("act_%s", act_name); |
1da177e4 LT |
503 | rtnl_lock(); |
504 | ||
505 | a_o = tc_lookup_action_n(act_name); | |
506 | ||
507 | /* We dropped the RTNL semaphore in order to | |
508 | * perform the module load. So, even if we | |
509 | * succeeded in loading the module we have to | |
510 | * tell the caller to replay the request. We | |
511 | * indicate this using -EAGAIN. | |
512 | */ | |
513 | if (a_o != NULL) { | |
514 | *err = -EAGAIN; | |
515 | goto err_mod; | |
516 | } | |
517 | #endif | |
d152b4e1 | 518 | *err = -ENOENT; |
1da177e4 LT |
519 | goto err_out; |
520 | } | |
521 | ||
522 | *err = -ENOMEM; | |
0da974f4 | 523 | a = kzalloc(sizeof(*a), GFP_KERNEL); |
1da177e4 LT |
524 | if (a == NULL) |
525 | goto err_mod; | |
1da177e4 LT |
526 | |
527 | /* backward compatibility for policer */ | |
528 | if (name == NULL) | |
529 | *err = a_o->init(tb[TCA_ACT_OPTIONS-1], est, a, ovr, bind); | |
530 | else | |
531 | *err = a_o->init(rta, est, a, ovr, bind); | |
532 | if (*err < 0) | |
533 | goto err_free; | |
534 | ||
535 | /* module count goes up only when brand new policy is created | |
536 | if it exists and is only bound to in a_o->init() then | |
537 | ACT_P_CREATED is not returned (a zero is). | |
538 | */ | |
539 | if (*err != ACT_P_CREATED) | |
540 | module_put(a_o->owner); | |
541 | a->ops = a_o; | |
1da177e4 LT |
542 | |
543 | *err = 0; | |
544 | return a; | |
545 | ||
546 | err_free: | |
547 | kfree(a); | |
548 | err_mod: | |
549 | module_put(a_o->owner); | |
550 | err_out: | |
551 | return NULL; | |
552 | } | |
553 | ||
554 | struct tc_action *tcf_action_init(struct rtattr *rta, struct rtattr *est, | |
10297b99 | 555 | char *name, int ovr, int bind, int *err) |
1da177e4 LT |
556 | { |
557 | struct rtattr *tb[TCA_ACT_MAX_PRIO+1]; | |
558 | struct tc_action *head = NULL, *act, *act_prev = NULL; | |
559 | int i; | |
560 | ||
561 | if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0) { | |
562 | *err = -EINVAL; | |
563 | return head; | |
564 | } | |
565 | ||
566 | for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) { | |
567 | act = tcf_action_init_1(tb[i], est, name, ovr, bind, err); | |
568 | if (act == NULL) | |
569 | goto err; | |
570 | act->order = i+1; | |
571 | ||
572 | if (head == NULL) | |
573 | head = act; | |
574 | else | |
575 | act_prev->next = act; | |
576 | act_prev = act; | |
577 | } | |
578 | return head; | |
579 | ||
580 | err: | |
581 | if (head != NULL) | |
582 | tcf_action_destroy(head, bind); | |
583 | return NULL; | |
584 | } | |
585 | ||
586 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a, | |
587 | int compat_mode) | |
588 | { | |
589 | int err = 0; | |
590 | struct gnet_dump d; | |
591 | struct tcf_act_hdr *h = a->priv; | |
10297b99 | 592 | |
1da177e4 LT |
593 | if (h == NULL) |
594 | goto errout; | |
595 | ||
596 | /* compat_mode being true specifies a call that is supposed | |
597 | * to add additional backward compatiblity statistic TLVs. | |
598 | */ | |
599 | if (compat_mode) { | |
600 | if (a->type == TCA_OLD_COMPAT) | |
601 | err = gnet_stats_start_copy_compat(skb, 0, | |
e9ce1cd3 | 602 | TCA_STATS, TCA_XSTATS, h->tcf_stats_lock, &d); |
1da177e4 LT |
603 | else |
604 | return 0; | |
605 | } else | |
606 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
e9ce1cd3 | 607 | h->tcf_stats_lock, &d); |
1da177e4 LT |
608 | |
609 | if (err < 0) | |
610 | goto errout; | |
611 | ||
612 | if (a->ops != NULL && a->ops->get_stats != NULL) | |
613 | if (a->ops->get_stats(skb, a) < 0) | |
614 | goto errout; | |
615 | ||
e9ce1cd3 | 616 | if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 || |
1da177e4 | 617 | #ifdef CONFIG_NET_ESTIMATOR |
e9ce1cd3 | 618 | gnet_stats_copy_rate_est(&d, &h->tcf_rate_est) < 0 || |
1da177e4 | 619 | #endif |
e9ce1cd3 | 620 | gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0) |
1da177e4 LT |
621 | goto errout; |
622 | ||
623 | if (gnet_stats_finish_copy(&d) < 0) | |
624 | goto errout; | |
625 | ||
626 | return 0; | |
627 | ||
628 | errout: | |
629 | return -1; | |
630 | } | |
631 | ||
632 | static int | |
633 | tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq, | |
10297b99 | 634 | u16 flags, int event, int bind, int ref) |
1da177e4 LT |
635 | { |
636 | struct tcamsg *t; | |
637 | struct nlmsghdr *nlh; | |
27a884dc | 638 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
639 | struct rtattr *x; |
640 | ||
e431b8c0 JHS |
641 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
642 | ||
1da177e4 LT |
643 | t = NLMSG_DATA(nlh); |
644 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
645 | t->tca__pad1 = 0; |
646 | t->tca__pad2 = 0; | |
10297b99 | 647 | |
27a884dc | 648 | x = (struct rtattr *)skb_tail_pointer(skb); |
1da177e4 LT |
649 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); |
650 | ||
651 | if (tcf_action_dump(skb, a, bind, ref) < 0) | |
652 | goto rtattr_failure; | |
653 | ||
27a884dc | 654 | x->rta_len = skb_tail_pointer(skb) - (u8 *)x; |
10297b99 | 655 | |
27a884dc | 656 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
657 | return skb->len; |
658 | ||
659 | rtattr_failure: | |
660 | nlmsg_failure: | |
661 | skb_trim(skb, b - skb->data); | |
662 | return -1; | |
663 | } | |
664 | ||
665 | static int | |
666 | act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event) | |
667 | { | |
668 | struct sk_buff *skb; | |
1da177e4 LT |
669 | |
670 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
671 | if (!skb) | |
672 | return -ENOBUFS; | |
673 | if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { | |
674 | kfree_skb(skb); | |
675 | return -EINVAL; | |
676 | } | |
2942e900 TG |
677 | |
678 | return rtnl_unicast(skb, pid); | |
1da177e4 LT |
679 | } |
680 | ||
681 | static struct tc_action * | |
682 | tcf_action_get_1(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int *err) | |
683 | { | |
684 | struct rtattr *tb[TCA_ACT_MAX+1]; | |
685 | struct tc_action *a; | |
686 | int index; | |
687 | ||
688 | *err = -EINVAL; | |
689 | if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0) | |
690 | return NULL; | |
691 | ||
692 | if (tb[TCA_ACT_INDEX - 1] == NULL || | |
693 | RTA_PAYLOAD(tb[TCA_ACT_INDEX - 1]) < sizeof(index)) | |
694 | return NULL; | |
695 | index = *(int *)RTA_DATA(tb[TCA_ACT_INDEX - 1]); | |
696 | ||
697 | *err = -ENOMEM; | |
0da974f4 | 698 | a = kzalloc(sizeof(struct tc_action), GFP_KERNEL); |
1da177e4 LT |
699 | if (a == NULL) |
700 | return NULL; | |
1da177e4 LT |
701 | |
702 | *err = -EINVAL; | |
703 | a->ops = tc_lookup_action(tb[TCA_ACT_KIND - 1]); | |
704 | if (a->ops == NULL) | |
705 | goto err_free; | |
706 | if (a->ops->lookup == NULL) | |
707 | goto err_mod; | |
708 | *err = -ENOENT; | |
709 | if (a->ops->lookup(a, index) == 0) | |
710 | goto err_mod; | |
711 | ||
712 | module_put(a->ops->owner); | |
713 | *err = 0; | |
714 | return a; | |
715 | err_mod: | |
716 | module_put(a->ops->owner); | |
717 | err_free: | |
718 | kfree(a); | |
719 | return NULL; | |
720 | } | |
721 | ||
722 | static void cleanup_a(struct tc_action *act) | |
723 | { | |
724 | struct tc_action *a; | |
725 | ||
726 | for (a = act; a; a = act) { | |
727 | act = a->next; | |
728 | kfree(a); | |
729 | } | |
730 | } | |
731 | ||
732 | static struct tc_action *create_a(int i) | |
733 | { | |
734 | struct tc_action *act; | |
735 | ||
0da974f4 | 736 | act = kzalloc(sizeof(*act), GFP_KERNEL); |
1da177e4 LT |
737 | if (act == NULL) { |
738 | printk("create_a: failed to alloc!\n"); | |
739 | return NULL; | |
740 | } | |
1da177e4 LT |
741 | act->order = i; |
742 | return act; | |
743 | } | |
744 | ||
745 | static int tca_action_flush(struct rtattr *rta, struct nlmsghdr *n, u32 pid) | |
746 | { | |
747 | struct sk_buff *skb; | |
748 | unsigned char *b; | |
749 | struct nlmsghdr *nlh; | |
750 | struct tcamsg *t; | |
751 | struct netlink_callback dcb; | |
752 | struct rtattr *x; | |
753 | struct rtattr *tb[TCA_ACT_MAX+1]; | |
754 | struct rtattr *kind; | |
755 | struct tc_action *a = create_a(0); | |
756 | int err = -EINVAL; | |
757 | ||
758 | if (a == NULL) { | |
759 | printk("tca_action_flush: couldnt create tc_action\n"); | |
760 | return err; | |
761 | } | |
762 | ||
763 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
764 | if (!skb) { | |
765 | printk("tca_action_flush: failed skb alloc\n"); | |
766 | kfree(a); | |
767 | return -ENOBUFS; | |
768 | } | |
769 | ||
27a884dc | 770 | b = skb_tail_pointer(skb); |
1da177e4 LT |
771 | |
772 | if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0) | |
773 | goto err_out; | |
774 | ||
775 | kind = tb[TCA_ACT_KIND-1]; | |
776 | a->ops = tc_lookup_action(kind); | |
777 | if (a->ops == NULL) | |
778 | goto err_out; | |
779 | ||
780 | nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t)); | |
781 | t = NLMSG_DATA(nlh); | |
782 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
783 | t->tca__pad1 = 0; |
784 | t->tca__pad2 = 0; | |
1da177e4 | 785 | |
27a884dc | 786 | x = (struct rtattr *)skb_tail_pointer(skb); |
1da177e4 LT |
787 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); |
788 | ||
789 | err = a->ops->walk(skb, &dcb, RTM_DELACTION, a); | |
790 | if (err < 0) | |
791 | goto rtattr_failure; | |
792 | ||
27a884dc | 793 | x->rta_len = skb_tail_pointer(skb) - (u8 *)x; |
1da177e4 | 794 | |
27a884dc | 795 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
796 | nlh->nlmsg_flags |= NLM_F_ROOT; |
797 | module_put(a->ops->owner); | |
798 | kfree(a); | |
ac6d439d | 799 | err = rtnetlink_send(skb, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
800 | if (err > 0) |
801 | return 0; | |
802 | ||
803 | return err; | |
804 | ||
805 | rtattr_failure: | |
1da177e4 | 806 | nlmsg_failure: |
ebbaeab1 | 807 | module_put(a->ops->owner); |
1da177e4 LT |
808 | err_out: |
809 | kfree_skb(skb); | |
810 | kfree(a); | |
811 | return err; | |
812 | } | |
813 | ||
814 | static int | |
815 | tca_action_gd(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int event) | |
816 | { | |
817 | int i, ret = 0; | |
818 | struct rtattr *tb[TCA_ACT_MAX_PRIO+1]; | |
819 | struct tc_action *head = NULL, *act, *act_prev = NULL; | |
820 | ||
821 | if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0) | |
822 | return -EINVAL; | |
823 | ||
824 | if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) { | |
825 | if (tb[0] != NULL && tb[1] == NULL) | |
826 | return tca_action_flush(tb[0], n, pid); | |
827 | } | |
828 | ||
829 | for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) { | |
830 | act = tcf_action_get_1(tb[i], n, pid, &ret); | |
831 | if (act == NULL) | |
832 | goto err; | |
833 | act->order = i+1; | |
834 | ||
835 | if (head == NULL) | |
836 | head = act; | |
837 | else | |
838 | act_prev->next = act; | |
839 | act_prev = act; | |
840 | } | |
841 | ||
842 | if (event == RTM_GETACTION) | |
843 | ret = act_get_notify(pid, n, head, event); | |
844 | else { /* delete */ | |
845 | struct sk_buff *skb; | |
846 | ||
847 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
848 | if (!skb) { | |
849 | ret = -ENOBUFS; | |
850 | goto err; | |
851 | } | |
852 | ||
853 | if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event, | |
10297b99 | 854 | 0, 1) <= 0) { |
1da177e4 LT |
855 | kfree_skb(skb); |
856 | ret = -EINVAL; | |
857 | goto err; | |
858 | } | |
859 | ||
860 | /* now do the delete */ | |
861 | tcf_action_destroy(head, 0); | |
ac6d439d | 862 | ret = rtnetlink_send(skb, pid, RTNLGRP_TC, |
10297b99 | 863 | n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
864 | if (ret > 0) |
865 | return 0; | |
866 | return ret; | |
867 | } | |
868 | err: | |
869 | cleanup_a(head); | |
870 | return ret; | |
871 | } | |
872 | ||
873 | static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event, | |
10297b99 | 874 | u16 flags) |
1da177e4 LT |
875 | { |
876 | struct tcamsg *t; | |
877 | struct nlmsghdr *nlh; | |
878 | struct sk_buff *skb; | |
879 | struct rtattr *x; | |
880 | unsigned char *b; | |
881 | int err = 0; | |
882 | ||
883 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
884 | if (!skb) | |
885 | return -ENOBUFS; | |
886 | ||
27a884dc | 887 | b = skb_tail_pointer(skb); |
1da177e4 | 888 | |
e431b8c0 | 889 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
1da177e4 LT |
890 | t = NLMSG_DATA(nlh); |
891 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
892 | t->tca__pad1 = 0; |
893 | t->tca__pad2 = 0; | |
894 | ||
27a884dc | 895 | x = (struct rtattr *)skb_tail_pointer(skb); |
1da177e4 LT |
896 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); |
897 | ||
898 | if (tcf_action_dump(skb, a, 0, 0) < 0) | |
899 | goto rtattr_failure; | |
900 | ||
27a884dc | 901 | x->rta_len = skb_tail_pointer(skb) - (u8 *)x; |
10297b99 | 902 | |
27a884dc | 903 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
ac6d439d | 904 | NETLINK_CB(skb).dst_group = RTNLGRP_TC; |
10297b99 | 905 | |
ac6d439d | 906 | err = rtnetlink_send(skb, pid, RTNLGRP_TC, flags&NLM_F_ECHO); |
1da177e4 LT |
907 | if (err > 0) |
908 | err = 0; | |
909 | return err; | |
910 | ||
911 | rtattr_failure: | |
912 | nlmsg_failure: | |
f6e57464 | 913 | kfree_skb(skb); |
1da177e4 LT |
914 | return -1; |
915 | } | |
916 | ||
10297b99 | 917 | |
1da177e4 LT |
918 | static int |
919 | tcf_action_add(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int ovr) | |
920 | { | |
921 | int ret = 0; | |
922 | struct tc_action *act; | |
923 | struct tc_action *a; | |
924 | u32 seq = n->nlmsg_seq; | |
925 | ||
926 | act = tcf_action_init(rta, NULL, NULL, ovr, 0, &ret); | |
927 | if (act == NULL) | |
928 | goto done; | |
929 | ||
930 | /* dump then free all the actions after update; inserted policy | |
931 | * stays intact | |
932 | * */ | |
933 | ret = tcf_add_notify(act, pid, seq, RTM_NEWACTION, n->nlmsg_flags); | |
934 | for (a = act; a; a = act) { | |
935 | act = a->next; | |
936 | kfree(a); | |
937 | } | |
938 | done: | |
939 | return ret; | |
940 | } | |
941 | ||
942 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
943 | { | |
944 | struct rtattr **tca = arg; | |
945 | u32 pid = skb ? NETLINK_CB(skb).pid : 0; | |
946 | int ret = 0, ovr = 0; | |
947 | ||
948 | if (tca[TCA_ACT_TAB-1] == NULL) { | |
949 | printk("tc_ctl_action: received NO action attribs\n"); | |
950 | return -EINVAL; | |
951 | } | |
952 | ||
953 | /* n->nlmsg_flags&NLM_F_CREATE | |
954 | * */ | |
955 | switch (n->nlmsg_type) { | |
956 | case RTM_NEWACTION: | |
957 | /* we are going to assume all other flags | |
958 | * imply create only if it doesnt exist | |
959 | * Note that CREATE | EXCL implies that | |
960 | * but since we want avoid ambiguity (eg when flags | |
961 | * is zero) then just set this | |
962 | */ | |
963 | if (n->nlmsg_flags&NLM_F_REPLACE) | |
964 | ovr = 1; | |
965 | replay: | |
966 | ret = tcf_action_add(tca[TCA_ACT_TAB-1], n, pid, ovr); | |
967 | if (ret == -EAGAIN) | |
968 | goto replay; | |
969 | break; | |
970 | case RTM_DELACTION: | |
971 | ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_DELACTION); | |
972 | break; | |
973 | case RTM_GETACTION: | |
974 | ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_GETACTION); | |
975 | break; | |
976 | default: | |
977 | BUG(); | |
978 | } | |
979 | ||
980 | return ret; | |
981 | } | |
982 | ||
26dab893 | 983 | static struct rtattr * |
1da177e4 LT |
984 | find_dump_kind(struct nlmsghdr *n) |
985 | { | |
986 | struct rtattr *tb1, *tb2[TCA_ACT_MAX+1]; | |
987 | struct rtattr *tb[TCA_ACT_MAX_PRIO + 1]; | |
988 | struct rtattr *rta[TCAA_MAX + 1]; | |
989 | struct rtattr *kind; | |
990 | int min_len = NLMSG_LENGTH(sizeof(struct tcamsg)); | |
991 | int attrlen = n->nlmsg_len - NLMSG_ALIGN(min_len); | |
992 | struct rtattr *attr = (void *) n + NLMSG_ALIGN(min_len); | |
993 | ||
994 | if (rtattr_parse(rta, TCAA_MAX, attr, attrlen) < 0) | |
995 | return NULL; | |
996 | tb1 = rta[TCA_ACT_TAB - 1]; | |
997 | if (tb1 == NULL) | |
998 | return NULL; | |
999 | ||
1000 | if (rtattr_parse(tb, TCA_ACT_MAX_PRIO, RTA_DATA(tb1), | |
10297b99 | 1001 | NLMSG_ALIGN(RTA_PAYLOAD(tb1))) < 0) |
1da177e4 LT |
1002 | return NULL; |
1003 | if (tb[0] == NULL) | |
1004 | return NULL; | |
1005 | ||
1006 | if (rtattr_parse(tb2, TCA_ACT_MAX, RTA_DATA(tb[0]), | |
10297b99 | 1007 | RTA_PAYLOAD(tb[0])) < 0) |
1da177e4 LT |
1008 | return NULL; |
1009 | kind = tb2[TCA_ACT_KIND-1]; | |
1010 | ||
26dab893 | 1011 | return kind; |
1da177e4 LT |
1012 | } |
1013 | ||
1014 | static int | |
1015 | tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) | |
1016 | { | |
1017 | struct nlmsghdr *nlh; | |
27a884dc | 1018 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1019 | struct rtattr *x; |
1020 | struct tc_action_ops *a_o; | |
1021 | struct tc_action a; | |
1022 | int ret = 0; | |
1023 | struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh); | |
26dab893 | 1024 | struct rtattr *kind = find_dump_kind(cb->nlh); |
1da177e4 LT |
1025 | |
1026 | if (kind == NULL) { | |
1027 | printk("tc_dump_action: action bad kind\n"); | |
1028 | return 0; | |
1029 | } | |
1030 | ||
26dab893 | 1031 | a_o = tc_lookup_action(kind); |
1da177e4 | 1032 | if (a_o == NULL) { |
1da177e4 LT |
1033 | return 0; |
1034 | } | |
1035 | ||
1036 | memset(&a, 0, sizeof(struct tc_action)); | |
1037 | a.ops = a_o; | |
1038 | ||
1039 | if (a_o->walk == NULL) { | |
26dab893 | 1040 | printk("tc_dump_action: %s !capable of dumping table\n", a_o->kind); |
1da177e4 LT |
1041 | goto rtattr_failure; |
1042 | } | |
1043 | ||
1044 | nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, | |
10297b99 | 1045 | cb->nlh->nlmsg_type, sizeof(*t)); |
1da177e4 LT |
1046 | t = NLMSG_DATA(nlh); |
1047 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
1048 | t->tca__pad1 = 0; |
1049 | t->tca__pad2 = 0; | |
1da177e4 | 1050 | |
27a884dc | 1051 | x = (struct rtattr *)skb_tail_pointer(skb); |
1da177e4 LT |
1052 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); |
1053 | ||
1054 | ret = a_o->walk(skb, cb, RTM_GETACTION, &a); | |
1055 | if (ret < 0) | |
1056 | goto rtattr_failure; | |
1057 | ||
1058 | if (ret > 0) { | |
27a884dc | 1059 | x->rta_len = skb_tail_pointer(skb) - (u8 *)x; |
1da177e4 LT |
1060 | ret = skb->len; |
1061 | } else | |
1062 | skb_trim(skb, (u8*)x - skb->data); | |
1063 | ||
27a884dc | 1064 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1065 | if (NETLINK_CB(cb->skb).pid && ret) |
1066 | nlh->nlmsg_flags |= NLM_F_MULTI; | |
1067 | module_put(a_o->owner); | |
1068 | return skb->len; | |
1069 | ||
1070 | rtattr_failure: | |
1071 | nlmsg_failure: | |
1072 | module_put(a_o->owner); | |
1073 | skb_trim(skb, b - skb->data); | |
1074 | return skb->len; | |
1075 | } | |
1076 | ||
1077 | static int __init tc_action_init(void) | |
1078 | { | |
1079 | struct rtnetlink_link *link_p = rtnetlink_links[PF_UNSPEC]; | |
1080 | ||
1081 | if (link_p) { | |
1082 | link_p[RTM_NEWACTION-RTM_BASE].doit = tc_ctl_action; | |
1083 | link_p[RTM_DELACTION-RTM_BASE].doit = tc_ctl_action; | |
1084 | link_p[RTM_GETACTION-RTM_BASE].doit = tc_ctl_action; | |
1085 | link_p[RTM_GETACTION-RTM_BASE].dumpit = tc_dump_action; | |
1086 | } | |
1087 | ||
1da177e4 LT |
1088 | return 0; |
1089 | } | |
1090 | ||
1091 | subsys_initcall(tc_action_init); | |
1092 | ||
1093 | EXPORT_SYMBOL(tcf_register_action); | |
1094 | EXPORT_SYMBOL(tcf_unregister_action); | |
1095 | EXPORT_SYMBOL(tcf_action_exec); | |
1096 | EXPORT_SYMBOL(tcf_action_dump_1); |