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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * net/sched/act_api.c Packet action API. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Author: Jamal Hadi Salim | |
10 | * | |
11 | * | |
12 | */ | |
13 | ||
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> | |
dc5fc579 | 34 | #include <net/netlink.h> |
1da177e4 | 35 | |
e9ce1cd3 DM |
36 | void tcf_hash_destroy(struct tcf_common *p, struct tcf_hashinfo *hinfo) |
37 | { | |
38 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); | |
39 | struct tcf_common **p1p; | |
40 | ||
41 | for (p1p = &hinfo->htab[h]; *p1p; p1p = &(*p1p)->tcfc_next) { | |
42 | if (*p1p == p) { | |
43 | write_lock_bh(hinfo->lock); | |
44 | *p1p = p->tcfc_next; | |
45 | write_unlock_bh(hinfo->lock); | |
46 | #ifdef CONFIG_NET_ESTIMATOR | |
47 | gen_kill_estimator(&p->tcfc_bstats, | |
48 | &p->tcfc_rate_est); | |
1da177e4 | 49 | #endif |
e9ce1cd3 DM |
50 | kfree(p); |
51 | return; | |
52 | } | |
53 | } | |
54 | BUG_TRAP(0); | |
55 | } | |
56 | EXPORT_SYMBOL(tcf_hash_destroy); | |
57 | ||
58 | int tcf_hash_release(struct tcf_common *p, int bind, | |
59 | struct tcf_hashinfo *hinfo) | |
60 | { | |
61 | int ret = 0; | |
62 | ||
63 | if (p) { | |
64 | if (bind) | |
65 | p->tcfc_bindcnt--; | |
66 | ||
67 | p->tcfc_refcnt--; | |
10297b99 | 68 | if (p->tcfc_bindcnt <= 0 && p->tcfc_refcnt <= 0) { |
e9ce1cd3 DM |
69 | tcf_hash_destroy(p, hinfo); |
70 | ret = 1; | |
71 | } | |
72 | } | |
73 | return ret; | |
74 | } | |
75 | EXPORT_SYMBOL(tcf_hash_release); | |
76 | ||
77 | static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
78 | struct tc_action *a, struct tcf_hashinfo *hinfo) | |
79 | { | |
80 | struct tcf_common *p; | |
81 | int err = 0, index = -1,i = 0, s_i = 0, n_i = 0; | |
82 | struct rtattr *r ; | |
83 | ||
84 | read_lock(hinfo->lock); | |
85 | ||
86 | s_i = cb->args[0]; | |
87 | ||
88 | for (i = 0; i < (hinfo->hmask + 1); i++) { | |
89 | p = hinfo->htab[tcf_hash(i, hinfo->hmask)]; | |
90 | ||
91 | for (; p; p = p->tcfc_next) { | |
92 | index++; | |
93 | if (index < s_i) | |
94 | continue; | |
95 | a->priv = p; | |
96 | a->order = n_i; | |
27a884dc | 97 | r = (struct rtattr *)skb_tail_pointer(skb); |
e9ce1cd3 DM |
98 | RTA_PUT(skb, a->order, 0, NULL); |
99 | err = tcf_action_dump_1(skb, a, 0, 0); | |
100 | if (err < 0) { | |
101 | index--; | |
dc5fc579 | 102 | nlmsg_trim(skb, r); |
e9ce1cd3 DM |
103 | goto done; |
104 | } | |
27a884dc | 105 | r->rta_len = skb_tail_pointer(skb) - (u8 *)r; |
e9ce1cd3 DM |
106 | n_i++; |
107 | if (n_i >= TCA_ACT_MAX_PRIO) | |
108 | goto done; | |
109 | } | |
110 | } | |
111 | done: | |
112 | read_unlock(hinfo->lock); | |
113 | if (n_i) | |
114 | cb->args[0] += n_i; | |
115 | return n_i; | |
116 | ||
117 | rtattr_failure: | |
dc5fc579 | 118 | nlmsg_trim(skb, r); |
e9ce1cd3 DM |
119 | goto done; |
120 | } | |
121 | ||
122 | static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a, | |
123 | struct tcf_hashinfo *hinfo) | |
124 | { | |
125 | struct tcf_common *p, *s_p; | |
126 | struct rtattr *r ; | |
127 | int i= 0, n_i = 0; | |
128 | ||
27a884dc | 129 | r = (struct rtattr *)skb_tail_pointer(skb); |
e9ce1cd3 DM |
130 | RTA_PUT(skb, a->order, 0, NULL); |
131 | RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind); | |
132 | for (i = 0; i < (hinfo->hmask + 1); i++) { | |
133 | p = hinfo->htab[tcf_hash(i, hinfo->hmask)]; | |
134 | ||
135 | while (p != NULL) { | |
136 | s_p = p->tcfc_next; | |
137 | if (ACT_P_DELETED == tcf_hash_release(p, 0, hinfo)) | |
138 | module_put(a->ops->owner); | |
139 | n_i++; | |
140 | p = s_p; | |
141 | } | |
142 | } | |
143 | RTA_PUT(skb, TCA_FCNT, 4, &n_i); | |
27a884dc | 144 | r->rta_len = skb_tail_pointer(skb) - (u8 *)r; |
e9ce1cd3 DM |
145 | |
146 | return n_i; | |
147 | rtattr_failure: | |
dc5fc579 | 148 | nlmsg_trim(skb, r); |
e9ce1cd3 DM |
149 | return -EINVAL; |
150 | } | |
151 | ||
152 | int tcf_generic_walker(struct sk_buff *skb, struct netlink_callback *cb, | |
153 | int type, struct tc_action *a) | |
154 | { | |
155 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
156 | ||
157 | if (type == RTM_DELACTION) { | |
158 | return tcf_del_walker(skb, a, hinfo); | |
159 | } else if (type == RTM_GETACTION) { | |
160 | return tcf_dump_walker(skb, cb, a, hinfo); | |
161 | } else { | |
162 | printk("tcf_generic_walker: unknown action %d\n", type); | |
163 | return -EINVAL; | |
164 | } | |
165 | } | |
166 | EXPORT_SYMBOL(tcf_generic_walker); | |
167 | ||
168 | struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo) | |
169 | { | |
170 | struct tcf_common *p; | |
171 | ||
172 | read_lock(hinfo->lock); | |
173 | for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p; | |
174 | p = p->tcfc_next) { | |
175 | if (p->tcfc_index == index) | |
176 | break; | |
177 | } | |
178 | read_unlock(hinfo->lock); | |
179 | ||
180 | return p; | |
181 | } | |
182 | EXPORT_SYMBOL(tcf_hash_lookup); | |
183 | ||
184 | u32 tcf_hash_new_index(u32 *idx_gen, struct tcf_hashinfo *hinfo) | |
185 | { | |
186 | u32 val = *idx_gen; | |
187 | ||
188 | do { | |
189 | if (++val == 0) | |
190 | val = 1; | |
191 | } while (tcf_hash_lookup(val, hinfo)); | |
192 | ||
193 | return (*idx_gen = val); | |
194 | } | |
195 | EXPORT_SYMBOL(tcf_hash_new_index); | |
196 | ||
197 | int tcf_hash_search(struct tc_action *a, u32 index) | |
198 | { | |
199 | struct tcf_hashinfo *hinfo = a->ops->hinfo; | |
200 | struct tcf_common *p = tcf_hash_lookup(index, hinfo); | |
201 | ||
202 | if (p) { | |
203 | a->priv = p; | |
204 | return 1; | |
205 | } | |
206 | return 0; | |
207 | } | |
208 | EXPORT_SYMBOL(tcf_hash_search); | |
209 | ||
210 | struct tcf_common *tcf_hash_check(u32 index, struct tc_action *a, int bind, | |
211 | struct tcf_hashinfo *hinfo) | |
212 | { | |
213 | struct tcf_common *p = NULL; | |
214 | if (index && (p = tcf_hash_lookup(index, hinfo)) != NULL) { | |
215 | if (bind) { | |
216 | p->tcfc_bindcnt++; | |
217 | p->tcfc_refcnt++; | |
218 | } | |
219 | a->priv = p; | |
220 | } | |
221 | return p; | |
222 | } | |
223 | EXPORT_SYMBOL(tcf_hash_check); | |
224 | ||
225 | 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) | |
226 | { | |
227 | struct tcf_common *p = kzalloc(size, GFP_KERNEL); | |
228 | ||
229 | if (unlikely(!p)) | |
230 | return p; | |
231 | p->tcfc_refcnt = 1; | |
232 | if (bind) | |
233 | p->tcfc_bindcnt = 1; | |
234 | ||
235 | spin_lock_init(&p->tcfc_lock); | |
236 | p->tcfc_stats_lock = &p->tcfc_lock; | |
237 | p->tcfc_index = index ? index : tcf_hash_new_index(idx_gen, hinfo); | |
238 | p->tcfc_tm.install = jiffies; | |
239 | p->tcfc_tm.lastuse = jiffies; | |
240 | #ifdef CONFIG_NET_ESTIMATOR | |
241 | if (est) | |
242 | gen_new_estimator(&p->tcfc_bstats, &p->tcfc_rate_est, | |
243 | p->tcfc_stats_lock, est); | |
1da177e4 | 244 | #endif |
e9ce1cd3 DM |
245 | a->priv = (void *) p; |
246 | return p; | |
247 | } | |
248 | EXPORT_SYMBOL(tcf_hash_create); | |
249 | ||
250 | void tcf_hash_insert(struct tcf_common *p, struct tcf_hashinfo *hinfo) | |
251 | { | |
252 | unsigned int h = tcf_hash(p->tcfc_index, hinfo->hmask); | |
253 | ||
254 | write_lock_bh(hinfo->lock); | |
255 | p->tcfc_next = hinfo->htab[h]; | |
256 | hinfo->htab[h] = p; | |
257 | write_unlock_bh(hinfo->lock); | |
258 | } | |
259 | EXPORT_SYMBOL(tcf_hash_insert); | |
1da177e4 LT |
260 | |
261 | static struct tc_action_ops *act_base = NULL; | |
262 | static DEFINE_RWLOCK(act_mod_lock); | |
263 | ||
264 | int tcf_register_action(struct tc_action_ops *act) | |
265 | { | |
266 | struct tc_action_ops *a, **ap; | |
267 | ||
268 | write_lock(&act_mod_lock); | |
269 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) { | |
270 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { | |
271 | write_unlock(&act_mod_lock); | |
272 | return -EEXIST; | |
273 | } | |
274 | } | |
275 | act->next = NULL; | |
276 | *ap = act; | |
277 | write_unlock(&act_mod_lock); | |
278 | return 0; | |
279 | } | |
280 | ||
281 | int tcf_unregister_action(struct tc_action_ops *act) | |
282 | { | |
283 | struct tc_action_ops *a, **ap; | |
284 | int err = -ENOENT; | |
285 | ||
286 | write_lock(&act_mod_lock); | |
287 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) | |
288 | if (a == act) | |
289 | break; | |
290 | if (a) { | |
291 | *ap = a->next; | |
292 | a->next = NULL; | |
293 | err = 0; | |
294 | } | |
295 | write_unlock(&act_mod_lock); | |
296 | return err; | |
297 | } | |
298 | ||
299 | /* lookup by name */ | |
300 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
301 | { | |
302 | struct tc_action_ops *a = NULL; | |
303 | ||
304 | if (kind) { | |
305 | read_lock(&act_mod_lock); | |
306 | for (a = act_base; a; a = a->next) { | |
307 | if (strcmp(kind, a->kind) == 0) { | |
308 | if (!try_module_get(a->owner)) { | |
309 | read_unlock(&act_mod_lock); | |
310 | return NULL; | |
311 | } | |
312 | break; | |
313 | } | |
314 | } | |
315 | read_unlock(&act_mod_lock); | |
316 | } | |
317 | return a; | |
318 | } | |
319 | ||
320 | /* lookup by rtattr */ | |
321 | static struct tc_action_ops *tc_lookup_action(struct rtattr *kind) | |
322 | { | |
323 | struct tc_action_ops *a = NULL; | |
324 | ||
325 | if (kind) { | |
326 | read_lock(&act_mod_lock); | |
327 | for (a = act_base; a; a = a->next) { | |
328 | if (rtattr_strcmp(kind, a->kind) == 0) { | |
329 | if (!try_module_get(a->owner)) { | |
330 | read_unlock(&act_mod_lock); | |
331 | return NULL; | |
332 | } | |
333 | break; | |
334 | } | |
335 | } | |
336 | read_unlock(&act_mod_lock); | |
337 | } | |
338 | return a; | |
339 | } | |
340 | ||
341 | #if 0 | |
342 | /* lookup by id */ | |
343 | static struct tc_action_ops *tc_lookup_action_id(u32 type) | |
344 | { | |
345 | struct tc_action_ops *a = NULL; | |
346 | ||
347 | if (type) { | |
348 | read_lock(&act_mod_lock); | |
349 | for (a = act_base; a; a = a->next) { | |
350 | if (a->type == type) { | |
351 | if (!try_module_get(a->owner)) { | |
352 | read_unlock(&act_mod_lock); | |
353 | return NULL; | |
354 | } | |
355 | break; | |
356 | } | |
357 | } | |
358 | read_unlock(&act_mod_lock); | |
359 | } | |
360 | return a; | |
361 | } | |
362 | #endif | |
363 | ||
364 | int tcf_action_exec(struct sk_buff *skb, struct tc_action *act, | |
10297b99 | 365 | struct tcf_result *res) |
1da177e4 LT |
366 | { |
367 | struct tc_action *a; | |
368 | int ret = -1; | |
369 | ||
370 | if (skb->tc_verd & TC_NCLS) { | |
371 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
1da177e4 LT |
372 | ret = TC_ACT_OK; |
373 | goto exec_done; | |
374 | } | |
375 | while ((a = act) != NULL) { | |
376 | repeat: | |
377 | if (a->ops && a->ops->act) { | |
f43c5a0d | 378 | ret = a->ops->act(skb, a, res); |
1da177e4 LT |
379 | if (TC_MUNGED & skb->tc_verd) { |
380 | /* copied already, allow trampling */ | |
381 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); | |
382 | skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd); | |
383 | } | |
1da177e4 LT |
384 | if (ret == TC_ACT_REPEAT) |
385 | goto repeat; /* we need a ttl - JHS */ | |
14d50e78 HS |
386 | if (ret != TC_ACT_PIPE) |
387 | goto exec_done; | |
1da177e4 LT |
388 | } |
389 | act = a->next; | |
390 | } | |
391 | exec_done: | |
1da177e4 LT |
392 | return ret; |
393 | } | |
394 | ||
395 | void tcf_action_destroy(struct tc_action *act, int bind) | |
396 | { | |
397 | struct tc_action *a; | |
398 | ||
399 | for (a = act; a; a = act) { | |
400 | if (a->ops && a->ops->cleanup) { | |
1da177e4 LT |
401 | if (a->ops->cleanup(a, bind) == ACT_P_DELETED) |
402 | module_put(a->ops->owner); | |
403 | act = act->next; | |
404 | kfree(a); | |
405 | } else { /*FIXME: Remove later - catch insertion bugs*/ | |
406 | printk("tcf_action_destroy: BUG? destroying NULL ops\n"); | |
407 | act = act->next; | |
408 | kfree(a); | |
409 | } | |
410 | } | |
411 | } | |
412 | ||
413 | int | |
414 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
415 | { | |
416 | int err = -EINVAL; | |
417 | ||
418 | if (a->ops == NULL || a->ops->dump == NULL) | |
419 | return err; | |
420 | return a->ops->dump(skb, a, bind, ref); | |
421 | } | |
422 | ||
423 | int | |
424 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
425 | { | |
426 | int err = -EINVAL; | |
27a884dc | 427 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
428 | struct rtattr *r; |
429 | ||
430 | if (a->ops == NULL || a->ops->dump == NULL) | |
431 | return err; | |
432 | ||
433 | RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind); | |
434 | if (tcf_action_copy_stats(skb, a, 0)) | |
435 | goto rtattr_failure; | |
27a884dc | 436 | r = (struct rtattr *)skb_tail_pointer(skb); |
1da177e4 LT |
437 | RTA_PUT(skb, TCA_OPTIONS, 0, NULL); |
438 | if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) { | |
27a884dc | 439 | r->rta_len = skb_tail_pointer(skb) - (u8 *)r; |
1da177e4 LT |
440 | return err; |
441 | } | |
442 | ||
443 | rtattr_failure: | |
dc5fc579 | 444 | nlmsg_trim(skb, b); |
1da177e4 LT |
445 | return -1; |
446 | } | |
447 | ||
448 | int | |
449 | tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref) | |
450 | { | |
451 | struct tc_action *a; | |
452 | int err = -EINVAL; | |
27a884dc | 453 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
454 | struct rtattr *r ; |
455 | ||
456 | while ((a = act) != NULL) { | |
27a884dc | 457 | r = (struct rtattr *)skb_tail_pointer(skb); |
1da177e4 LT |
458 | act = a->next; |
459 | RTA_PUT(skb, a->order, 0, NULL); | |
460 | err = tcf_action_dump_1(skb, a, bind, ref); | |
461 | if (err < 0) | |
4fe683f5 | 462 | goto errout; |
27a884dc | 463 | r->rta_len = skb_tail_pointer(skb) - (u8 *)r; |
1da177e4 LT |
464 | } |
465 | ||
466 | return 0; | |
467 | ||
468 | rtattr_failure: | |
4fe683f5 TG |
469 | err = -EINVAL; |
470 | errout: | |
dc5fc579 | 471 | nlmsg_trim(skb, b); |
4fe683f5 | 472 | return err; |
1da177e4 LT |
473 | } |
474 | ||
475 | struct tc_action *tcf_action_init_1(struct rtattr *rta, struct rtattr *est, | |
10297b99 | 476 | char *name, int ovr, int bind, int *err) |
1da177e4 LT |
477 | { |
478 | struct tc_action *a; | |
479 | struct tc_action_ops *a_o; | |
480 | char act_name[IFNAMSIZ]; | |
481 | struct rtattr *tb[TCA_ACT_MAX+1]; | |
482 | struct rtattr *kind; | |
483 | ||
484 | *err = -EINVAL; | |
485 | ||
486 | if (name == NULL) { | |
487 | if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0) | |
488 | goto err_out; | |
489 | kind = tb[TCA_ACT_KIND-1]; | |
490 | if (kind == NULL) | |
491 | goto err_out; | |
492 | if (rtattr_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) | |
493 | goto err_out; | |
494 | } else { | |
495 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) | |
496 | goto err_out; | |
497 | } | |
498 | ||
499 | a_o = tc_lookup_action_n(act_name); | |
500 | if (a_o == NULL) { | |
501 | #ifdef CONFIG_KMOD | |
502 | rtnl_unlock(); | |
4bba3925 | 503 | request_module("act_%s", act_name); |
1da177e4 LT |
504 | rtnl_lock(); |
505 | ||
506 | a_o = tc_lookup_action_n(act_name); | |
507 | ||
508 | /* We dropped the RTNL semaphore in order to | |
509 | * perform the module load. So, even if we | |
510 | * succeeded in loading the module we have to | |
511 | * tell the caller to replay the request. We | |
512 | * indicate this using -EAGAIN. | |
513 | */ | |
514 | if (a_o != NULL) { | |
515 | *err = -EAGAIN; | |
516 | goto err_mod; | |
517 | } | |
518 | #endif | |
d152b4e1 | 519 | *err = -ENOENT; |
1da177e4 LT |
520 | goto err_out; |
521 | } | |
522 | ||
523 | *err = -ENOMEM; | |
0da974f4 | 524 | a = kzalloc(sizeof(*a), GFP_KERNEL); |
1da177e4 LT |
525 | if (a == NULL) |
526 | goto err_mod; | |
1da177e4 LT |
527 | |
528 | /* backward compatibility for policer */ | |
529 | if (name == NULL) | |
530 | *err = a_o->init(tb[TCA_ACT_OPTIONS-1], est, a, ovr, bind); | |
531 | else | |
532 | *err = a_o->init(rta, est, a, ovr, bind); | |
533 | if (*err < 0) | |
534 | goto err_free; | |
535 | ||
536 | /* module count goes up only when brand new policy is created | |
537 | if it exists and is only bound to in a_o->init() then | |
538 | ACT_P_CREATED is not returned (a zero is). | |
539 | */ | |
540 | if (*err != ACT_P_CREATED) | |
541 | module_put(a_o->owner); | |
542 | a->ops = a_o; | |
1da177e4 LT |
543 | |
544 | *err = 0; | |
545 | return a; | |
546 | ||
547 | err_free: | |
548 | kfree(a); | |
549 | err_mod: | |
550 | module_put(a_o->owner); | |
551 | err_out: | |
552 | return NULL; | |
553 | } | |
554 | ||
555 | struct tc_action *tcf_action_init(struct rtattr *rta, struct rtattr *est, | |
10297b99 | 556 | char *name, int ovr, int bind, int *err) |
1da177e4 LT |
557 | { |
558 | struct rtattr *tb[TCA_ACT_MAX_PRIO+1]; | |
559 | struct tc_action *head = NULL, *act, *act_prev = NULL; | |
560 | int i; | |
561 | ||
562 | if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0) { | |
563 | *err = -EINVAL; | |
564 | return head; | |
565 | } | |
566 | ||
567 | for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) { | |
568 | act = tcf_action_init_1(tb[i], est, name, ovr, bind, err); | |
569 | if (act == NULL) | |
570 | goto err; | |
571 | act->order = i+1; | |
572 | ||
573 | if (head == NULL) | |
574 | head = act; | |
575 | else | |
576 | act_prev->next = act; | |
577 | act_prev = act; | |
578 | } | |
579 | return head; | |
580 | ||
581 | err: | |
582 | if (head != NULL) | |
583 | tcf_action_destroy(head, bind); | |
584 | return NULL; | |
585 | } | |
586 | ||
587 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a, | |
588 | int compat_mode) | |
589 | { | |
590 | int err = 0; | |
591 | struct gnet_dump d; | |
592 | struct tcf_act_hdr *h = a->priv; | |
10297b99 | 593 | |
1da177e4 LT |
594 | if (h == NULL) |
595 | goto errout; | |
596 | ||
597 | /* compat_mode being true specifies a call that is supposed | |
598 | * to add additional backward compatiblity statistic TLVs. | |
599 | */ | |
600 | if (compat_mode) { | |
601 | if (a->type == TCA_OLD_COMPAT) | |
602 | err = gnet_stats_start_copy_compat(skb, 0, | |
e9ce1cd3 | 603 | TCA_STATS, TCA_XSTATS, h->tcf_stats_lock, &d); |
1da177e4 LT |
604 | else |
605 | return 0; | |
606 | } else | |
607 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
e9ce1cd3 | 608 | h->tcf_stats_lock, &d); |
1da177e4 LT |
609 | |
610 | if (err < 0) | |
611 | goto errout; | |
612 | ||
613 | if (a->ops != NULL && a->ops->get_stats != NULL) | |
614 | if (a->ops->get_stats(skb, a) < 0) | |
615 | goto errout; | |
616 | ||
e9ce1cd3 | 617 | if (gnet_stats_copy_basic(&d, &h->tcf_bstats) < 0 || |
1da177e4 | 618 | #ifdef CONFIG_NET_ESTIMATOR |
e9ce1cd3 | 619 | gnet_stats_copy_rate_est(&d, &h->tcf_rate_est) < 0 || |
1da177e4 | 620 | #endif |
e9ce1cd3 | 621 | gnet_stats_copy_queue(&d, &h->tcf_qstats) < 0) |
1da177e4 LT |
622 | goto errout; |
623 | ||
624 | if (gnet_stats_finish_copy(&d) < 0) | |
625 | goto errout; | |
626 | ||
627 | return 0; | |
628 | ||
629 | errout: | |
630 | return -1; | |
631 | } | |
632 | ||
633 | static int | |
634 | tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq, | |
10297b99 | 635 | u16 flags, int event, int bind, int ref) |
1da177e4 LT |
636 | { |
637 | struct tcamsg *t; | |
638 | struct nlmsghdr *nlh; | |
27a884dc | 639 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
640 | struct rtattr *x; |
641 | ||
e431b8c0 JHS |
642 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
643 | ||
1da177e4 LT |
644 | t = NLMSG_DATA(nlh); |
645 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
646 | t->tca__pad1 = 0; |
647 | t->tca__pad2 = 0; | |
10297b99 | 648 | |
27a884dc | 649 | x = (struct rtattr *)skb_tail_pointer(skb); |
1da177e4 LT |
650 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); |
651 | ||
652 | if (tcf_action_dump(skb, a, bind, ref) < 0) | |
653 | goto rtattr_failure; | |
654 | ||
27a884dc | 655 | x->rta_len = skb_tail_pointer(skb) - (u8 *)x; |
10297b99 | 656 | |
27a884dc | 657 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
658 | return skb->len; |
659 | ||
660 | rtattr_failure: | |
661 | nlmsg_failure: | |
dc5fc579 | 662 | nlmsg_trim(skb, b); |
1da177e4 LT |
663 | return -1; |
664 | } | |
665 | ||
666 | static int | |
667 | act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event) | |
668 | { | |
669 | struct sk_buff *skb; | |
1da177e4 LT |
670 | |
671 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
672 | if (!skb) | |
673 | return -ENOBUFS; | |
674 | if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { | |
675 | kfree_skb(skb); | |
676 | return -EINVAL; | |
677 | } | |
2942e900 TG |
678 | |
679 | return rtnl_unicast(skb, pid); | |
1da177e4 LT |
680 | } |
681 | ||
682 | static struct tc_action * | |
683 | tcf_action_get_1(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int *err) | |
684 | { | |
685 | struct rtattr *tb[TCA_ACT_MAX+1]; | |
686 | struct tc_action *a; | |
687 | int index; | |
688 | ||
689 | *err = -EINVAL; | |
690 | if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0) | |
691 | return NULL; | |
692 | ||
693 | if (tb[TCA_ACT_INDEX - 1] == NULL || | |
694 | RTA_PAYLOAD(tb[TCA_ACT_INDEX - 1]) < sizeof(index)) | |
695 | return NULL; | |
696 | index = *(int *)RTA_DATA(tb[TCA_ACT_INDEX - 1]); | |
697 | ||
698 | *err = -ENOMEM; | |
0da974f4 | 699 | a = kzalloc(sizeof(struct tc_action), GFP_KERNEL); |
1da177e4 LT |
700 | if (a == NULL) |
701 | return NULL; | |
1da177e4 LT |
702 | |
703 | *err = -EINVAL; | |
704 | a->ops = tc_lookup_action(tb[TCA_ACT_KIND - 1]); | |
705 | if (a->ops == NULL) | |
706 | goto err_free; | |
707 | if (a->ops->lookup == NULL) | |
708 | goto err_mod; | |
709 | *err = -ENOENT; | |
710 | if (a->ops->lookup(a, index) == 0) | |
711 | goto err_mod; | |
712 | ||
713 | module_put(a->ops->owner); | |
714 | *err = 0; | |
715 | return a; | |
716 | err_mod: | |
717 | module_put(a->ops->owner); | |
718 | err_free: | |
719 | kfree(a); | |
720 | return NULL; | |
721 | } | |
722 | ||
723 | static void cleanup_a(struct tc_action *act) | |
724 | { | |
725 | struct tc_action *a; | |
726 | ||
727 | for (a = act; a; a = act) { | |
728 | act = a->next; | |
729 | kfree(a); | |
730 | } | |
731 | } | |
732 | ||
733 | static struct tc_action *create_a(int i) | |
734 | { | |
735 | struct tc_action *act; | |
736 | ||
0da974f4 | 737 | act = kzalloc(sizeof(*act), GFP_KERNEL); |
1da177e4 LT |
738 | if (act == NULL) { |
739 | printk("create_a: failed to alloc!\n"); | |
740 | return NULL; | |
741 | } | |
1da177e4 LT |
742 | act->order = i; |
743 | return act; | |
744 | } | |
745 | ||
746 | static int tca_action_flush(struct rtattr *rta, struct nlmsghdr *n, u32 pid) | |
747 | { | |
748 | struct sk_buff *skb; | |
749 | unsigned char *b; | |
750 | struct nlmsghdr *nlh; | |
751 | struct tcamsg *t; | |
752 | struct netlink_callback dcb; | |
753 | struct rtattr *x; | |
754 | struct rtattr *tb[TCA_ACT_MAX+1]; | |
755 | struct rtattr *kind; | |
756 | struct tc_action *a = create_a(0); | |
757 | int err = -EINVAL; | |
758 | ||
759 | if (a == NULL) { | |
760 | printk("tca_action_flush: couldnt create tc_action\n"); | |
761 | return err; | |
762 | } | |
763 | ||
764 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
765 | if (!skb) { | |
766 | printk("tca_action_flush: failed skb alloc\n"); | |
767 | kfree(a); | |
768 | return -ENOBUFS; | |
769 | } | |
770 | ||
27a884dc | 771 | b = skb_tail_pointer(skb); |
1da177e4 LT |
772 | |
773 | if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0) | |
774 | goto err_out; | |
775 | ||
776 | kind = tb[TCA_ACT_KIND-1]; | |
777 | a->ops = tc_lookup_action(kind); | |
778 | if (a->ops == NULL) | |
779 | goto err_out; | |
780 | ||
781 | nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t)); | |
782 | t = NLMSG_DATA(nlh); | |
783 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
784 | t->tca__pad1 = 0; |
785 | t->tca__pad2 = 0; | |
1da177e4 | 786 | |
27a884dc | 787 | x = (struct rtattr *)skb_tail_pointer(skb); |
1da177e4 LT |
788 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); |
789 | ||
790 | err = a->ops->walk(skb, &dcb, RTM_DELACTION, a); | |
791 | if (err < 0) | |
792 | goto rtattr_failure; | |
793 | ||
27a884dc | 794 | x->rta_len = skb_tail_pointer(skb) - (u8 *)x; |
1da177e4 | 795 | |
27a884dc | 796 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
797 | nlh->nlmsg_flags |= NLM_F_ROOT; |
798 | module_put(a->ops->owner); | |
799 | kfree(a); | |
ac6d439d | 800 | err = rtnetlink_send(skb, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
801 | if (err > 0) |
802 | return 0; | |
803 | ||
804 | return err; | |
805 | ||
806 | rtattr_failure: | |
1da177e4 | 807 | nlmsg_failure: |
ebbaeab1 | 808 | module_put(a->ops->owner); |
1da177e4 LT |
809 | err_out: |
810 | kfree_skb(skb); | |
811 | kfree(a); | |
812 | return err; | |
813 | } | |
814 | ||
815 | static int | |
816 | tca_action_gd(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int event) | |
817 | { | |
818 | int i, ret = 0; | |
819 | struct rtattr *tb[TCA_ACT_MAX_PRIO+1]; | |
820 | struct tc_action *head = NULL, *act, *act_prev = NULL; | |
821 | ||
822 | if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0) | |
823 | return -EINVAL; | |
824 | ||
825 | if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) { | |
826 | if (tb[0] != NULL && tb[1] == NULL) | |
827 | return tca_action_flush(tb[0], n, pid); | |
828 | } | |
829 | ||
830 | for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) { | |
831 | act = tcf_action_get_1(tb[i], n, pid, &ret); | |
832 | if (act == NULL) | |
833 | goto err; | |
834 | act->order = i+1; | |
835 | ||
836 | if (head == NULL) | |
837 | head = act; | |
838 | else | |
839 | act_prev->next = act; | |
840 | act_prev = act; | |
841 | } | |
842 | ||
843 | if (event == RTM_GETACTION) | |
844 | ret = act_get_notify(pid, n, head, event); | |
845 | else { /* delete */ | |
846 | struct sk_buff *skb; | |
847 | ||
848 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
849 | if (!skb) { | |
850 | ret = -ENOBUFS; | |
851 | goto err; | |
852 | } | |
853 | ||
854 | if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event, | |
10297b99 | 855 | 0, 1) <= 0) { |
1da177e4 LT |
856 | kfree_skb(skb); |
857 | ret = -EINVAL; | |
858 | goto err; | |
859 | } | |
860 | ||
861 | /* now do the delete */ | |
862 | tcf_action_destroy(head, 0); | |
ac6d439d | 863 | ret = rtnetlink_send(skb, pid, RTNLGRP_TC, |
10297b99 | 864 | n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
865 | if (ret > 0) |
866 | return 0; | |
867 | return ret; | |
868 | } | |
869 | err: | |
870 | cleanup_a(head); | |
871 | return ret; | |
872 | } | |
873 | ||
874 | static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event, | |
10297b99 | 875 | u16 flags) |
1da177e4 LT |
876 | { |
877 | struct tcamsg *t; | |
878 | struct nlmsghdr *nlh; | |
879 | struct sk_buff *skb; | |
880 | struct rtattr *x; | |
881 | unsigned char *b; | |
882 | int err = 0; | |
883 | ||
884 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
885 | if (!skb) | |
886 | return -ENOBUFS; | |
887 | ||
27a884dc | 888 | b = skb_tail_pointer(skb); |
1da177e4 | 889 | |
e431b8c0 | 890 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
1da177e4 LT |
891 | t = NLMSG_DATA(nlh); |
892 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
893 | t->tca__pad1 = 0; |
894 | t->tca__pad2 = 0; | |
895 | ||
27a884dc | 896 | x = (struct rtattr *)skb_tail_pointer(skb); |
1da177e4 LT |
897 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); |
898 | ||
899 | if (tcf_action_dump(skb, a, 0, 0) < 0) | |
900 | goto rtattr_failure; | |
901 | ||
27a884dc | 902 | x->rta_len = skb_tail_pointer(skb) - (u8 *)x; |
10297b99 | 903 | |
27a884dc | 904 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
ac6d439d | 905 | NETLINK_CB(skb).dst_group = RTNLGRP_TC; |
10297b99 | 906 | |
ac6d439d | 907 | err = rtnetlink_send(skb, pid, RTNLGRP_TC, flags&NLM_F_ECHO); |
1da177e4 LT |
908 | if (err > 0) |
909 | err = 0; | |
910 | return err; | |
911 | ||
912 | rtattr_failure: | |
913 | nlmsg_failure: | |
f6e57464 | 914 | kfree_skb(skb); |
1da177e4 LT |
915 | return -1; |
916 | } | |
917 | ||
10297b99 | 918 | |
1da177e4 LT |
919 | static int |
920 | tcf_action_add(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int ovr) | |
921 | { | |
922 | int ret = 0; | |
923 | struct tc_action *act; | |
924 | struct tc_action *a; | |
925 | u32 seq = n->nlmsg_seq; | |
926 | ||
927 | act = tcf_action_init(rta, NULL, NULL, ovr, 0, &ret); | |
928 | if (act == NULL) | |
929 | goto done; | |
930 | ||
931 | /* dump then free all the actions after update; inserted policy | |
932 | * stays intact | |
933 | * */ | |
934 | ret = tcf_add_notify(act, pid, seq, RTM_NEWACTION, n->nlmsg_flags); | |
935 | for (a = act; a; a = act) { | |
936 | act = a->next; | |
937 | kfree(a); | |
938 | } | |
939 | done: | |
940 | return ret; | |
941 | } | |
942 | ||
943 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
944 | { | |
945 | struct rtattr **tca = arg; | |
946 | u32 pid = skb ? NETLINK_CB(skb).pid : 0; | |
947 | int ret = 0, ovr = 0; | |
948 | ||
949 | if (tca[TCA_ACT_TAB-1] == NULL) { | |
950 | printk("tc_ctl_action: received NO action attribs\n"); | |
951 | return -EINVAL; | |
952 | } | |
953 | ||
954 | /* n->nlmsg_flags&NLM_F_CREATE | |
955 | * */ | |
956 | switch (n->nlmsg_type) { | |
957 | case RTM_NEWACTION: | |
958 | /* we are going to assume all other flags | |
959 | * imply create only if it doesnt exist | |
960 | * Note that CREATE | EXCL implies that | |
961 | * but since we want avoid ambiguity (eg when flags | |
962 | * is zero) then just set this | |
963 | */ | |
964 | if (n->nlmsg_flags&NLM_F_REPLACE) | |
965 | ovr = 1; | |
966 | replay: | |
967 | ret = tcf_action_add(tca[TCA_ACT_TAB-1], n, pid, ovr); | |
968 | if (ret == -EAGAIN) | |
969 | goto replay; | |
970 | break; | |
971 | case RTM_DELACTION: | |
972 | ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_DELACTION); | |
973 | break; | |
974 | case RTM_GETACTION: | |
975 | ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_GETACTION); | |
976 | break; | |
977 | default: | |
978 | BUG(); | |
979 | } | |
980 | ||
981 | return ret; | |
982 | } | |
983 | ||
26dab893 | 984 | static struct rtattr * |
1da177e4 LT |
985 | find_dump_kind(struct nlmsghdr *n) |
986 | { | |
987 | struct rtattr *tb1, *tb2[TCA_ACT_MAX+1]; | |
988 | struct rtattr *tb[TCA_ACT_MAX_PRIO + 1]; | |
989 | struct rtattr *rta[TCAA_MAX + 1]; | |
990 | struct rtattr *kind; | |
991 | int min_len = NLMSG_LENGTH(sizeof(struct tcamsg)); | |
992 | int attrlen = n->nlmsg_len - NLMSG_ALIGN(min_len); | |
993 | struct rtattr *attr = (void *) n + NLMSG_ALIGN(min_len); | |
994 | ||
995 | if (rtattr_parse(rta, TCAA_MAX, attr, attrlen) < 0) | |
996 | return NULL; | |
997 | tb1 = rta[TCA_ACT_TAB - 1]; | |
998 | if (tb1 == NULL) | |
999 | return NULL; | |
1000 | ||
1001 | if (rtattr_parse(tb, TCA_ACT_MAX_PRIO, RTA_DATA(tb1), | |
10297b99 | 1002 | NLMSG_ALIGN(RTA_PAYLOAD(tb1))) < 0) |
1da177e4 LT |
1003 | return NULL; |
1004 | if (tb[0] == NULL) | |
1005 | return NULL; | |
1006 | ||
1007 | if (rtattr_parse(tb2, TCA_ACT_MAX, RTA_DATA(tb[0]), | |
10297b99 | 1008 | RTA_PAYLOAD(tb[0])) < 0) |
1da177e4 LT |
1009 | return NULL; |
1010 | kind = tb2[TCA_ACT_KIND-1]; | |
1011 | ||
26dab893 | 1012 | return kind; |
1da177e4 LT |
1013 | } |
1014 | ||
1015 | static int | |
1016 | tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) | |
1017 | { | |
1018 | struct nlmsghdr *nlh; | |
27a884dc | 1019 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1020 | struct rtattr *x; |
1021 | struct tc_action_ops *a_o; | |
1022 | struct tc_action a; | |
1023 | int ret = 0; | |
1024 | struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh); | |
26dab893 | 1025 | struct rtattr *kind = find_dump_kind(cb->nlh); |
1da177e4 LT |
1026 | |
1027 | if (kind == NULL) { | |
1028 | printk("tc_dump_action: action bad kind\n"); | |
1029 | return 0; | |
1030 | } | |
1031 | ||
26dab893 | 1032 | a_o = tc_lookup_action(kind); |
1da177e4 | 1033 | if (a_o == NULL) { |
1da177e4 LT |
1034 | return 0; |
1035 | } | |
1036 | ||
1037 | memset(&a, 0, sizeof(struct tc_action)); | |
1038 | a.ops = a_o; | |
1039 | ||
1040 | if (a_o->walk == NULL) { | |
26dab893 | 1041 | printk("tc_dump_action: %s !capable of dumping table\n", a_o->kind); |
1da177e4 LT |
1042 | goto rtattr_failure; |
1043 | } | |
1044 | ||
1045 | nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, | |
10297b99 | 1046 | cb->nlh->nlmsg_type, sizeof(*t)); |
1da177e4 LT |
1047 | t = NLMSG_DATA(nlh); |
1048 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
1049 | t->tca__pad1 = 0; |
1050 | t->tca__pad2 = 0; | |
1da177e4 | 1051 | |
27a884dc | 1052 | x = (struct rtattr *)skb_tail_pointer(skb); |
1da177e4 LT |
1053 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); |
1054 | ||
1055 | ret = a_o->walk(skb, cb, RTM_GETACTION, &a); | |
1056 | if (ret < 0) | |
1057 | goto rtattr_failure; | |
1058 | ||
1059 | if (ret > 0) { | |
27a884dc | 1060 | x->rta_len = skb_tail_pointer(skb) - (u8 *)x; |
1da177e4 LT |
1061 | ret = skb->len; |
1062 | } else | |
dc5fc579 | 1063 | nlmsg_trim(skb, x); |
1da177e4 | 1064 | |
27a884dc | 1065 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1066 | if (NETLINK_CB(cb->skb).pid && ret) |
1067 | nlh->nlmsg_flags |= NLM_F_MULTI; | |
1068 | module_put(a_o->owner); | |
1069 | return skb->len; | |
1070 | ||
1071 | rtattr_failure: | |
1072 | nlmsg_failure: | |
1073 | module_put(a_o->owner); | |
dc5fc579 | 1074 | nlmsg_trim(skb, b); |
1da177e4 LT |
1075 | return skb->len; |
1076 | } | |
1077 | ||
1078 | static int __init tc_action_init(void) | |
1079 | { | |
1080 | struct rtnetlink_link *link_p = rtnetlink_links[PF_UNSPEC]; | |
1081 | ||
1082 | if (link_p) { | |
1083 | link_p[RTM_NEWACTION-RTM_BASE].doit = tc_ctl_action; | |
1084 | link_p[RTM_DELACTION-RTM_BASE].doit = tc_ctl_action; | |
1085 | link_p[RTM_GETACTION-RTM_BASE].doit = tc_ctl_action; | |
1086 | link_p[RTM_GETACTION-RTM_BASE].dumpit = tc_dump_action; | |
1087 | } | |
1088 | ||
1da177e4 LT |
1089 | return 0; |
1090 | } | |
1091 | ||
1092 | subsys_initcall(tc_action_init); | |
1093 | ||
1094 | EXPORT_SYMBOL(tcf_register_action); | |
1095 | EXPORT_SYMBOL(tcf_unregister_action); | |
1096 | EXPORT_SYMBOL(tcf_action_exec); | |
1097 | EXPORT_SYMBOL(tcf_action_dump_1); |