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 | ||
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> | |
19 | #include <linux/sched.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/socket.h> | |
23 | #include <linux/sockios.h> | |
24 | #include <linux/in.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/interrupt.h> | |
27 | #include <linux/netdevice.h> | |
28 | #include <linux/skbuff.h> | |
29 | #include <linux/rtnetlink.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/kmod.h> | |
32 | #include <net/sock.h> | |
33 | #include <net/sch_generic.h> | |
34 | #include <net/act_api.h> | |
35 | ||
2edc2689 | 36 | #if 0 /* control */ |
1da177e4 LT |
37 | #define DPRINTK(format, args...) printk(KERN_DEBUG format, ##args) |
38 | #else | |
39 | #define DPRINTK(format, args...) | |
40 | #endif | |
41 | #if 0 /* data */ | |
42 | #define D2PRINTK(format, args...) printk(KERN_DEBUG format, ##args) | |
43 | #else | |
44 | #define D2PRINTK(format, args...) | |
45 | #endif | |
46 | ||
47 | static struct tc_action_ops *act_base = NULL; | |
48 | static DEFINE_RWLOCK(act_mod_lock); | |
49 | ||
50 | int tcf_register_action(struct tc_action_ops *act) | |
51 | { | |
52 | struct tc_action_ops *a, **ap; | |
53 | ||
54 | write_lock(&act_mod_lock); | |
55 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) { | |
56 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { | |
57 | write_unlock(&act_mod_lock); | |
58 | return -EEXIST; | |
59 | } | |
60 | } | |
61 | act->next = NULL; | |
62 | *ap = act; | |
63 | write_unlock(&act_mod_lock); | |
64 | return 0; | |
65 | } | |
66 | ||
67 | int tcf_unregister_action(struct tc_action_ops *act) | |
68 | { | |
69 | struct tc_action_ops *a, **ap; | |
70 | int err = -ENOENT; | |
71 | ||
72 | write_lock(&act_mod_lock); | |
73 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) | |
74 | if (a == act) | |
75 | break; | |
76 | if (a) { | |
77 | *ap = a->next; | |
78 | a->next = NULL; | |
79 | err = 0; | |
80 | } | |
81 | write_unlock(&act_mod_lock); | |
82 | return err; | |
83 | } | |
84 | ||
85 | /* lookup by name */ | |
86 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
87 | { | |
88 | struct tc_action_ops *a = NULL; | |
89 | ||
90 | if (kind) { | |
91 | read_lock(&act_mod_lock); | |
92 | for (a = act_base; a; a = a->next) { | |
93 | if (strcmp(kind, a->kind) == 0) { | |
94 | if (!try_module_get(a->owner)) { | |
95 | read_unlock(&act_mod_lock); | |
96 | return NULL; | |
97 | } | |
98 | break; | |
99 | } | |
100 | } | |
101 | read_unlock(&act_mod_lock); | |
102 | } | |
103 | return a; | |
104 | } | |
105 | ||
106 | /* lookup by rtattr */ | |
107 | static struct tc_action_ops *tc_lookup_action(struct rtattr *kind) | |
108 | { | |
109 | struct tc_action_ops *a = NULL; | |
110 | ||
111 | if (kind) { | |
112 | read_lock(&act_mod_lock); | |
113 | for (a = act_base; a; a = a->next) { | |
114 | if (rtattr_strcmp(kind, a->kind) == 0) { | |
115 | if (!try_module_get(a->owner)) { | |
116 | read_unlock(&act_mod_lock); | |
117 | return NULL; | |
118 | } | |
119 | break; | |
120 | } | |
121 | } | |
122 | read_unlock(&act_mod_lock); | |
123 | } | |
124 | return a; | |
125 | } | |
126 | ||
127 | #if 0 | |
128 | /* lookup by id */ | |
129 | static struct tc_action_ops *tc_lookup_action_id(u32 type) | |
130 | { | |
131 | struct tc_action_ops *a = NULL; | |
132 | ||
133 | if (type) { | |
134 | read_lock(&act_mod_lock); | |
135 | for (a = act_base; a; a = a->next) { | |
136 | if (a->type == type) { | |
137 | if (!try_module_get(a->owner)) { | |
138 | read_unlock(&act_mod_lock); | |
139 | return NULL; | |
140 | } | |
141 | break; | |
142 | } | |
143 | } | |
144 | read_unlock(&act_mod_lock); | |
145 | } | |
146 | return a; | |
147 | } | |
148 | #endif | |
149 | ||
150 | int tcf_action_exec(struct sk_buff *skb, struct tc_action *act, | |
151 | struct tcf_result *res) | |
152 | { | |
153 | struct tc_action *a; | |
154 | int ret = -1; | |
155 | ||
156 | if (skb->tc_verd & TC_NCLS) { | |
157 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
158 | D2PRINTK("(%p)tcf_action_exec: cleared TC_NCLS in %s out %s\n", | |
159 | skb, skb->input_dev ? skb->input_dev->name : "xxx", | |
160 | skb->dev->name); | |
161 | ret = TC_ACT_OK; | |
162 | goto exec_done; | |
163 | } | |
164 | while ((a = act) != NULL) { | |
165 | repeat: | |
166 | if (a->ops && a->ops->act) { | |
f43c5a0d | 167 | ret = a->ops->act(skb, a, res); |
1da177e4 LT |
168 | if (TC_MUNGED & skb->tc_verd) { |
169 | /* copied already, allow trampling */ | |
170 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); | |
171 | skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd); | |
172 | } | |
1da177e4 LT |
173 | if (ret == TC_ACT_REPEAT) |
174 | goto repeat; /* we need a ttl - JHS */ | |
14d50e78 HS |
175 | if (ret != TC_ACT_PIPE) |
176 | goto exec_done; | |
1da177e4 LT |
177 | } |
178 | act = a->next; | |
179 | } | |
180 | exec_done: | |
1da177e4 LT |
181 | return ret; |
182 | } | |
183 | ||
184 | void tcf_action_destroy(struct tc_action *act, int bind) | |
185 | { | |
186 | struct tc_action *a; | |
187 | ||
188 | for (a = act; a; a = act) { | |
189 | if (a->ops && a->ops->cleanup) { | |
190 | DPRINTK("tcf_action_destroy destroying %p next %p\n", | |
191 | a, a->next); | |
192 | if (a->ops->cleanup(a, bind) == ACT_P_DELETED) | |
193 | module_put(a->ops->owner); | |
194 | act = act->next; | |
195 | kfree(a); | |
196 | } else { /*FIXME: Remove later - catch insertion bugs*/ | |
197 | printk("tcf_action_destroy: BUG? destroying NULL ops\n"); | |
198 | act = act->next; | |
199 | kfree(a); | |
200 | } | |
201 | } | |
202 | } | |
203 | ||
204 | int | |
205 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
206 | { | |
207 | int err = -EINVAL; | |
208 | ||
209 | if (a->ops == NULL || a->ops->dump == NULL) | |
210 | return err; | |
211 | return a->ops->dump(skb, a, bind, ref); | |
212 | } | |
213 | ||
214 | int | |
215 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
216 | { | |
217 | int err = -EINVAL; | |
218 | unsigned char *b = skb->tail; | |
219 | struct rtattr *r; | |
220 | ||
221 | if (a->ops == NULL || a->ops->dump == NULL) | |
222 | return err; | |
223 | ||
224 | RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind); | |
225 | if (tcf_action_copy_stats(skb, a, 0)) | |
226 | goto rtattr_failure; | |
227 | r = (struct rtattr*) skb->tail; | |
228 | RTA_PUT(skb, TCA_OPTIONS, 0, NULL); | |
229 | if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) { | |
230 | r->rta_len = skb->tail - (u8*)r; | |
231 | return err; | |
232 | } | |
233 | ||
234 | rtattr_failure: | |
235 | skb_trim(skb, b - skb->data); | |
236 | return -1; | |
237 | } | |
238 | ||
239 | int | |
240 | tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref) | |
241 | { | |
242 | struct tc_action *a; | |
243 | int err = -EINVAL; | |
244 | unsigned char *b = skb->tail; | |
245 | struct rtattr *r ; | |
246 | ||
247 | while ((a = act) != NULL) { | |
248 | r = (struct rtattr*) skb->tail; | |
249 | act = a->next; | |
250 | RTA_PUT(skb, a->order, 0, NULL); | |
251 | err = tcf_action_dump_1(skb, a, bind, ref); | |
252 | if (err < 0) | |
4fe683f5 | 253 | goto errout; |
1da177e4 LT |
254 | r->rta_len = skb->tail - (u8*)r; |
255 | } | |
256 | ||
257 | return 0; | |
258 | ||
259 | rtattr_failure: | |
4fe683f5 TG |
260 | err = -EINVAL; |
261 | errout: | |
1da177e4 | 262 | skb_trim(skb, b - skb->data); |
4fe683f5 | 263 | return err; |
1da177e4 LT |
264 | } |
265 | ||
266 | struct tc_action *tcf_action_init_1(struct rtattr *rta, struct rtattr *est, | |
267 | char *name, int ovr, int bind, int *err) | |
268 | { | |
269 | struct tc_action *a; | |
270 | struct tc_action_ops *a_o; | |
271 | char act_name[IFNAMSIZ]; | |
272 | struct rtattr *tb[TCA_ACT_MAX+1]; | |
273 | struct rtattr *kind; | |
274 | ||
275 | *err = -EINVAL; | |
276 | ||
277 | if (name == NULL) { | |
278 | if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0) | |
279 | goto err_out; | |
280 | kind = tb[TCA_ACT_KIND-1]; | |
281 | if (kind == NULL) | |
282 | goto err_out; | |
283 | if (rtattr_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) | |
284 | goto err_out; | |
285 | } else { | |
286 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) | |
287 | goto err_out; | |
288 | } | |
289 | ||
290 | a_o = tc_lookup_action_n(act_name); | |
291 | if (a_o == NULL) { | |
292 | #ifdef CONFIG_KMOD | |
293 | rtnl_unlock(); | |
4bba3925 | 294 | request_module("act_%s", act_name); |
1da177e4 LT |
295 | rtnl_lock(); |
296 | ||
297 | a_o = tc_lookup_action_n(act_name); | |
298 | ||
299 | /* We dropped the RTNL semaphore in order to | |
300 | * perform the module load. So, even if we | |
301 | * succeeded in loading the module we have to | |
302 | * tell the caller to replay the request. We | |
303 | * indicate this using -EAGAIN. | |
304 | */ | |
305 | if (a_o != NULL) { | |
306 | *err = -EAGAIN; | |
307 | goto err_mod; | |
308 | } | |
309 | #endif | |
d152b4e1 | 310 | *err = -ENOENT; |
1da177e4 LT |
311 | goto err_out; |
312 | } | |
313 | ||
314 | *err = -ENOMEM; | |
0da974f4 | 315 | a = kzalloc(sizeof(*a), GFP_KERNEL); |
1da177e4 LT |
316 | if (a == NULL) |
317 | goto err_mod; | |
1da177e4 LT |
318 | |
319 | /* backward compatibility for policer */ | |
320 | if (name == NULL) | |
321 | *err = a_o->init(tb[TCA_ACT_OPTIONS-1], est, a, ovr, bind); | |
322 | else | |
323 | *err = a_o->init(rta, est, a, ovr, bind); | |
324 | if (*err < 0) | |
325 | goto err_free; | |
326 | ||
327 | /* module count goes up only when brand new policy is created | |
328 | if it exists and is only bound to in a_o->init() then | |
329 | ACT_P_CREATED is not returned (a zero is). | |
330 | */ | |
331 | if (*err != ACT_P_CREATED) | |
332 | module_put(a_o->owner); | |
333 | a->ops = a_o; | |
334 | DPRINTK("tcf_action_init_1: successfull %s\n", act_name); | |
335 | ||
336 | *err = 0; | |
337 | return a; | |
338 | ||
339 | err_free: | |
340 | kfree(a); | |
341 | err_mod: | |
342 | module_put(a_o->owner); | |
343 | err_out: | |
344 | return NULL; | |
345 | } | |
346 | ||
347 | struct tc_action *tcf_action_init(struct rtattr *rta, struct rtattr *est, | |
348 | char *name, int ovr, int bind, int *err) | |
349 | { | |
350 | struct rtattr *tb[TCA_ACT_MAX_PRIO+1]; | |
351 | struct tc_action *head = NULL, *act, *act_prev = NULL; | |
352 | int i; | |
353 | ||
354 | if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0) { | |
355 | *err = -EINVAL; | |
356 | return head; | |
357 | } | |
358 | ||
359 | for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) { | |
360 | act = tcf_action_init_1(tb[i], est, name, ovr, bind, err); | |
361 | if (act == NULL) | |
362 | goto err; | |
363 | act->order = i+1; | |
364 | ||
365 | if (head == NULL) | |
366 | head = act; | |
367 | else | |
368 | act_prev->next = act; | |
369 | act_prev = act; | |
370 | } | |
371 | return head; | |
372 | ||
373 | err: | |
374 | if (head != NULL) | |
375 | tcf_action_destroy(head, bind); | |
376 | return NULL; | |
377 | } | |
378 | ||
379 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a, | |
380 | int compat_mode) | |
381 | { | |
382 | int err = 0; | |
383 | struct gnet_dump d; | |
384 | struct tcf_act_hdr *h = a->priv; | |
385 | ||
386 | if (h == NULL) | |
387 | goto errout; | |
388 | ||
389 | /* compat_mode being true specifies a call that is supposed | |
390 | * to add additional backward compatiblity statistic TLVs. | |
391 | */ | |
392 | if (compat_mode) { | |
393 | if (a->type == TCA_OLD_COMPAT) | |
394 | err = gnet_stats_start_copy_compat(skb, 0, | |
395 | TCA_STATS, TCA_XSTATS, h->stats_lock, &d); | |
396 | else | |
397 | return 0; | |
398 | } else | |
399 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
400 | h->stats_lock, &d); | |
401 | ||
402 | if (err < 0) | |
403 | goto errout; | |
404 | ||
405 | if (a->ops != NULL && a->ops->get_stats != NULL) | |
406 | if (a->ops->get_stats(skb, a) < 0) | |
407 | goto errout; | |
408 | ||
409 | if (gnet_stats_copy_basic(&d, &h->bstats) < 0 || | |
410 | #ifdef CONFIG_NET_ESTIMATOR | |
411 | gnet_stats_copy_rate_est(&d, &h->rate_est) < 0 || | |
412 | #endif | |
413 | gnet_stats_copy_queue(&d, &h->qstats) < 0) | |
414 | goto errout; | |
415 | ||
416 | if (gnet_stats_finish_copy(&d) < 0) | |
417 | goto errout; | |
418 | ||
419 | return 0; | |
420 | ||
421 | errout: | |
422 | return -1; | |
423 | } | |
424 | ||
425 | static int | |
426 | tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq, | |
e431b8c0 | 427 | u16 flags, int event, int bind, int ref) |
1da177e4 LT |
428 | { |
429 | struct tcamsg *t; | |
430 | struct nlmsghdr *nlh; | |
431 | unsigned char *b = skb->tail; | |
432 | struct rtattr *x; | |
433 | ||
e431b8c0 JHS |
434 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
435 | ||
1da177e4 LT |
436 | t = NLMSG_DATA(nlh); |
437 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
438 | t->tca__pad1 = 0; |
439 | t->tca__pad2 = 0; | |
1da177e4 LT |
440 | |
441 | x = (struct rtattr*) skb->tail; | |
442 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); | |
443 | ||
444 | if (tcf_action_dump(skb, a, bind, ref) < 0) | |
445 | goto rtattr_failure; | |
446 | ||
447 | x->rta_len = skb->tail - (u8*)x; | |
448 | ||
449 | nlh->nlmsg_len = skb->tail - b; | |
450 | return skb->len; | |
451 | ||
452 | rtattr_failure: | |
453 | nlmsg_failure: | |
454 | skb_trim(skb, b - skb->data); | |
455 | return -1; | |
456 | } | |
457 | ||
458 | static int | |
459 | act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event) | |
460 | { | |
461 | struct sk_buff *skb; | |
1da177e4 LT |
462 | |
463 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
464 | if (!skb) | |
465 | return -ENOBUFS; | |
466 | if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { | |
467 | kfree_skb(skb); | |
468 | return -EINVAL; | |
469 | } | |
2942e900 TG |
470 | |
471 | return rtnl_unicast(skb, pid); | |
1da177e4 LT |
472 | } |
473 | ||
474 | static struct tc_action * | |
475 | tcf_action_get_1(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int *err) | |
476 | { | |
477 | struct rtattr *tb[TCA_ACT_MAX+1]; | |
478 | struct tc_action *a; | |
479 | int index; | |
480 | ||
481 | *err = -EINVAL; | |
482 | if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0) | |
483 | return NULL; | |
484 | ||
485 | if (tb[TCA_ACT_INDEX - 1] == NULL || | |
486 | RTA_PAYLOAD(tb[TCA_ACT_INDEX - 1]) < sizeof(index)) | |
487 | return NULL; | |
488 | index = *(int *)RTA_DATA(tb[TCA_ACT_INDEX - 1]); | |
489 | ||
490 | *err = -ENOMEM; | |
0da974f4 | 491 | a = kzalloc(sizeof(struct tc_action), GFP_KERNEL); |
1da177e4 LT |
492 | if (a == NULL) |
493 | return NULL; | |
1da177e4 LT |
494 | |
495 | *err = -EINVAL; | |
496 | a->ops = tc_lookup_action(tb[TCA_ACT_KIND - 1]); | |
497 | if (a->ops == NULL) | |
498 | goto err_free; | |
499 | if (a->ops->lookup == NULL) | |
500 | goto err_mod; | |
501 | *err = -ENOENT; | |
502 | if (a->ops->lookup(a, index) == 0) | |
503 | goto err_mod; | |
504 | ||
505 | module_put(a->ops->owner); | |
506 | *err = 0; | |
507 | return a; | |
508 | err_mod: | |
509 | module_put(a->ops->owner); | |
510 | err_free: | |
511 | kfree(a); | |
512 | return NULL; | |
513 | } | |
514 | ||
515 | static void cleanup_a(struct tc_action *act) | |
516 | { | |
517 | struct tc_action *a; | |
518 | ||
519 | for (a = act; a; a = act) { | |
520 | act = a->next; | |
521 | kfree(a); | |
522 | } | |
523 | } | |
524 | ||
525 | static struct tc_action *create_a(int i) | |
526 | { | |
527 | struct tc_action *act; | |
528 | ||
0da974f4 | 529 | act = kzalloc(sizeof(*act), GFP_KERNEL); |
1da177e4 LT |
530 | if (act == NULL) { |
531 | printk("create_a: failed to alloc!\n"); | |
532 | return NULL; | |
533 | } | |
1da177e4 LT |
534 | act->order = i; |
535 | return act; | |
536 | } | |
537 | ||
538 | static int tca_action_flush(struct rtattr *rta, struct nlmsghdr *n, u32 pid) | |
539 | { | |
540 | struct sk_buff *skb; | |
541 | unsigned char *b; | |
542 | struct nlmsghdr *nlh; | |
543 | struct tcamsg *t; | |
544 | struct netlink_callback dcb; | |
545 | struct rtattr *x; | |
546 | struct rtattr *tb[TCA_ACT_MAX+1]; | |
547 | struct rtattr *kind; | |
548 | struct tc_action *a = create_a(0); | |
549 | int err = -EINVAL; | |
550 | ||
551 | if (a == NULL) { | |
552 | printk("tca_action_flush: couldnt create tc_action\n"); | |
553 | return err; | |
554 | } | |
555 | ||
556 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
557 | if (!skb) { | |
558 | printk("tca_action_flush: failed skb alloc\n"); | |
559 | kfree(a); | |
560 | return -ENOBUFS; | |
561 | } | |
562 | ||
563 | b = (unsigned char *)skb->tail; | |
564 | ||
565 | if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0) | |
566 | goto err_out; | |
567 | ||
568 | kind = tb[TCA_ACT_KIND-1]; | |
569 | a->ops = tc_lookup_action(kind); | |
570 | if (a->ops == NULL) | |
571 | goto err_out; | |
572 | ||
573 | nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t)); | |
574 | t = NLMSG_DATA(nlh); | |
575 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
576 | t->tca__pad1 = 0; |
577 | t->tca__pad2 = 0; | |
1da177e4 LT |
578 | |
579 | x = (struct rtattr *) skb->tail; | |
580 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); | |
581 | ||
582 | err = a->ops->walk(skb, &dcb, RTM_DELACTION, a); | |
583 | if (err < 0) | |
584 | goto rtattr_failure; | |
585 | ||
586 | x->rta_len = skb->tail - (u8 *) x; | |
587 | ||
588 | nlh->nlmsg_len = skb->tail - b; | |
589 | nlh->nlmsg_flags |= NLM_F_ROOT; | |
590 | module_put(a->ops->owner); | |
591 | kfree(a); | |
ac6d439d | 592 | err = rtnetlink_send(skb, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
1da177e4 LT |
593 | if (err > 0) |
594 | return 0; | |
595 | ||
596 | return err; | |
597 | ||
598 | rtattr_failure: | |
1da177e4 | 599 | nlmsg_failure: |
ebbaeab1 | 600 | module_put(a->ops->owner); |
1da177e4 LT |
601 | err_out: |
602 | kfree_skb(skb); | |
603 | kfree(a); | |
604 | return err; | |
605 | } | |
606 | ||
607 | static int | |
608 | tca_action_gd(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int event) | |
609 | { | |
610 | int i, ret = 0; | |
611 | struct rtattr *tb[TCA_ACT_MAX_PRIO+1]; | |
612 | struct tc_action *head = NULL, *act, *act_prev = NULL; | |
613 | ||
614 | if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0) | |
615 | return -EINVAL; | |
616 | ||
617 | if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) { | |
618 | if (tb[0] != NULL && tb[1] == NULL) | |
619 | return tca_action_flush(tb[0], n, pid); | |
620 | } | |
621 | ||
622 | for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) { | |
623 | act = tcf_action_get_1(tb[i], n, pid, &ret); | |
624 | if (act == NULL) | |
625 | goto err; | |
626 | act->order = i+1; | |
627 | ||
628 | if (head == NULL) | |
629 | head = act; | |
630 | else | |
631 | act_prev->next = act; | |
632 | act_prev = act; | |
633 | } | |
634 | ||
635 | if (event == RTM_GETACTION) | |
636 | ret = act_get_notify(pid, n, head, event); | |
637 | else { /* delete */ | |
638 | struct sk_buff *skb; | |
639 | ||
640 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
641 | if (!skb) { | |
642 | ret = -ENOBUFS; | |
643 | goto err; | |
644 | } | |
645 | ||
646 | if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event, | |
647 | 0, 1) <= 0) { | |
648 | kfree_skb(skb); | |
649 | ret = -EINVAL; | |
650 | goto err; | |
651 | } | |
652 | ||
653 | /* now do the delete */ | |
654 | tcf_action_destroy(head, 0); | |
ac6d439d | 655 | ret = rtnetlink_send(skb, pid, RTNLGRP_TC, |
1da177e4 LT |
656 | n->nlmsg_flags&NLM_F_ECHO); |
657 | if (ret > 0) | |
658 | return 0; | |
659 | return ret; | |
660 | } | |
661 | err: | |
662 | cleanup_a(head); | |
663 | return ret; | |
664 | } | |
665 | ||
666 | static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event, | |
e431b8c0 | 667 | u16 flags) |
1da177e4 LT |
668 | { |
669 | struct tcamsg *t; | |
670 | struct nlmsghdr *nlh; | |
671 | struct sk_buff *skb; | |
672 | struct rtattr *x; | |
673 | unsigned char *b; | |
674 | int err = 0; | |
675 | ||
676 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
677 | if (!skb) | |
678 | return -ENOBUFS; | |
679 | ||
680 | b = (unsigned char *)skb->tail; | |
681 | ||
e431b8c0 | 682 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); |
1da177e4 LT |
683 | t = NLMSG_DATA(nlh); |
684 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
685 | t->tca__pad1 = 0; |
686 | t->tca__pad2 = 0; | |
687 | ||
1da177e4 LT |
688 | x = (struct rtattr*) skb->tail; |
689 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); | |
690 | ||
691 | if (tcf_action_dump(skb, a, 0, 0) < 0) | |
692 | goto rtattr_failure; | |
693 | ||
694 | x->rta_len = skb->tail - (u8*)x; | |
695 | ||
696 | nlh->nlmsg_len = skb->tail - b; | |
ac6d439d | 697 | NETLINK_CB(skb).dst_group = RTNLGRP_TC; |
1da177e4 | 698 | |
ac6d439d | 699 | err = rtnetlink_send(skb, pid, RTNLGRP_TC, flags&NLM_F_ECHO); |
1da177e4 LT |
700 | if (err > 0) |
701 | err = 0; | |
702 | return err; | |
703 | ||
704 | rtattr_failure: | |
705 | nlmsg_failure: | |
f6e57464 | 706 | kfree_skb(skb); |
1da177e4 LT |
707 | return -1; |
708 | } | |
709 | ||
710 | ||
711 | static int | |
712 | tcf_action_add(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int ovr) | |
713 | { | |
714 | int ret = 0; | |
715 | struct tc_action *act; | |
716 | struct tc_action *a; | |
717 | u32 seq = n->nlmsg_seq; | |
718 | ||
719 | act = tcf_action_init(rta, NULL, NULL, ovr, 0, &ret); | |
720 | if (act == NULL) | |
721 | goto done; | |
722 | ||
723 | /* dump then free all the actions after update; inserted policy | |
724 | * stays intact | |
725 | * */ | |
726 | ret = tcf_add_notify(act, pid, seq, RTM_NEWACTION, n->nlmsg_flags); | |
727 | for (a = act; a; a = act) { | |
728 | act = a->next; | |
729 | kfree(a); | |
730 | } | |
731 | done: | |
732 | return ret; | |
733 | } | |
734 | ||
735 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
736 | { | |
737 | struct rtattr **tca = arg; | |
738 | u32 pid = skb ? NETLINK_CB(skb).pid : 0; | |
739 | int ret = 0, ovr = 0; | |
740 | ||
741 | if (tca[TCA_ACT_TAB-1] == NULL) { | |
742 | printk("tc_ctl_action: received NO action attribs\n"); | |
743 | return -EINVAL; | |
744 | } | |
745 | ||
746 | /* n->nlmsg_flags&NLM_F_CREATE | |
747 | * */ | |
748 | switch (n->nlmsg_type) { | |
749 | case RTM_NEWACTION: | |
750 | /* we are going to assume all other flags | |
751 | * imply create only if it doesnt exist | |
752 | * Note that CREATE | EXCL implies that | |
753 | * but since we want avoid ambiguity (eg when flags | |
754 | * is zero) then just set this | |
755 | */ | |
756 | if (n->nlmsg_flags&NLM_F_REPLACE) | |
757 | ovr = 1; | |
758 | replay: | |
759 | ret = tcf_action_add(tca[TCA_ACT_TAB-1], n, pid, ovr); | |
760 | if (ret == -EAGAIN) | |
761 | goto replay; | |
762 | break; | |
763 | case RTM_DELACTION: | |
764 | ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_DELACTION); | |
765 | break; | |
766 | case RTM_GETACTION: | |
767 | ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_GETACTION); | |
768 | break; | |
769 | default: | |
770 | BUG(); | |
771 | } | |
772 | ||
773 | return ret; | |
774 | } | |
775 | ||
26dab893 | 776 | static struct rtattr * |
1da177e4 LT |
777 | find_dump_kind(struct nlmsghdr *n) |
778 | { | |
779 | struct rtattr *tb1, *tb2[TCA_ACT_MAX+1]; | |
780 | struct rtattr *tb[TCA_ACT_MAX_PRIO + 1]; | |
781 | struct rtattr *rta[TCAA_MAX + 1]; | |
782 | struct rtattr *kind; | |
783 | int min_len = NLMSG_LENGTH(sizeof(struct tcamsg)); | |
784 | int attrlen = n->nlmsg_len - NLMSG_ALIGN(min_len); | |
785 | struct rtattr *attr = (void *) n + NLMSG_ALIGN(min_len); | |
786 | ||
787 | if (rtattr_parse(rta, TCAA_MAX, attr, attrlen) < 0) | |
788 | return NULL; | |
789 | tb1 = rta[TCA_ACT_TAB - 1]; | |
790 | if (tb1 == NULL) | |
791 | return NULL; | |
792 | ||
793 | if (rtattr_parse(tb, TCA_ACT_MAX_PRIO, RTA_DATA(tb1), | |
794 | NLMSG_ALIGN(RTA_PAYLOAD(tb1))) < 0) | |
795 | return NULL; | |
796 | if (tb[0] == NULL) | |
797 | return NULL; | |
798 | ||
799 | if (rtattr_parse(tb2, TCA_ACT_MAX, RTA_DATA(tb[0]), | |
800 | RTA_PAYLOAD(tb[0])) < 0) | |
801 | return NULL; | |
802 | kind = tb2[TCA_ACT_KIND-1]; | |
803 | ||
26dab893 | 804 | return kind; |
1da177e4 LT |
805 | } |
806 | ||
807 | static int | |
808 | tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) | |
809 | { | |
810 | struct nlmsghdr *nlh; | |
811 | unsigned char *b = skb->tail; | |
812 | struct rtattr *x; | |
813 | struct tc_action_ops *a_o; | |
814 | struct tc_action a; | |
815 | int ret = 0; | |
816 | struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh); | |
26dab893 | 817 | struct rtattr *kind = find_dump_kind(cb->nlh); |
1da177e4 LT |
818 | |
819 | if (kind == NULL) { | |
820 | printk("tc_dump_action: action bad kind\n"); | |
821 | return 0; | |
822 | } | |
823 | ||
26dab893 | 824 | a_o = tc_lookup_action(kind); |
1da177e4 | 825 | if (a_o == NULL) { |
1da177e4 LT |
826 | return 0; |
827 | } | |
828 | ||
829 | memset(&a, 0, sizeof(struct tc_action)); | |
830 | a.ops = a_o; | |
831 | ||
832 | if (a_o->walk == NULL) { | |
26dab893 | 833 | printk("tc_dump_action: %s !capable of dumping table\n", a_o->kind); |
1da177e4 LT |
834 | goto rtattr_failure; |
835 | } | |
836 | ||
837 | nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, | |
838 | cb->nlh->nlmsg_type, sizeof(*t)); | |
839 | t = NLMSG_DATA(nlh); | |
840 | t->tca_family = AF_UNSPEC; | |
9ef1d4c7 PM |
841 | t->tca__pad1 = 0; |
842 | t->tca__pad2 = 0; | |
1da177e4 LT |
843 | |
844 | x = (struct rtattr *) skb->tail; | |
845 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); | |
846 | ||
847 | ret = a_o->walk(skb, cb, RTM_GETACTION, &a); | |
848 | if (ret < 0) | |
849 | goto rtattr_failure; | |
850 | ||
851 | if (ret > 0) { | |
852 | x->rta_len = skb->tail - (u8 *) x; | |
853 | ret = skb->len; | |
854 | } else | |
855 | skb_trim(skb, (u8*)x - skb->data); | |
856 | ||
857 | nlh->nlmsg_len = skb->tail - b; | |
858 | if (NETLINK_CB(cb->skb).pid && ret) | |
859 | nlh->nlmsg_flags |= NLM_F_MULTI; | |
860 | module_put(a_o->owner); | |
861 | return skb->len; | |
862 | ||
863 | rtattr_failure: | |
864 | nlmsg_failure: | |
865 | module_put(a_o->owner); | |
866 | skb_trim(skb, b - skb->data); | |
867 | return skb->len; | |
868 | } | |
869 | ||
870 | static int __init tc_action_init(void) | |
871 | { | |
872 | struct rtnetlink_link *link_p = rtnetlink_links[PF_UNSPEC]; | |
873 | ||
874 | if (link_p) { | |
875 | link_p[RTM_NEWACTION-RTM_BASE].doit = tc_ctl_action; | |
876 | link_p[RTM_DELACTION-RTM_BASE].doit = tc_ctl_action; | |
877 | link_p[RTM_GETACTION-RTM_BASE].doit = tc_ctl_action; | |
878 | link_p[RTM_GETACTION-RTM_BASE].dumpit = tc_dump_action; | |
879 | } | |
880 | ||
1da177e4 LT |
881 | return 0; |
882 | } | |
883 | ||
884 | subsys_initcall(tc_action_init); | |
885 | ||
886 | EXPORT_SYMBOL(tcf_register_action); | |
887 | EXPORT_SYMBOL(tcf_unregister_action); | |
888 | EXPORT_SYMBOL(tcf_action_exec); | |
889 | EXPORT_SYMBOL(tcf_action_dump_1); |