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> | |
17 | #include <linux/config.h> | |
18 | #include <linux/types.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/sched.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/mm.h> | |
23 | #include <linux/socket.h> | |
24 | #include <linux/sockios.h> | |
25 | #include <linux/in.h> | |
26 | #include <linux/errno.h> | |
27 | #include <linux/interrupt.h> | |
28 | #include <linux/netdevice.h> | |
29 | #include <linux/skbuff.h> | |
30 | #include <linux/rtnetlink.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/kmod.h> | |
33 | #include <net/sock.h> | |
34 | #include <net/sch_generic.h> | |
35 | #include <net/act_api.h> | |
36 | ||
37 | #if 1 /* control */ | |
38 | #define DPRINTK(format, args...) printk(KERN_DEBUG format, ##args) | |
39 | #else | |
40 | #define DPRINTK(format, args...) | |
41 | #endif | |
42 | #if 0 /* data */ | |
43 | #define D2PRINTK(format, args...) printk(KERN_DEBUG format, ##args) | |
44 | #else | |
45 | #define D2PRINTK(format, args...) | |
46 | #endif | |
47 | ||
48 | static struct tc_action_ops *act_base = NULL; | |
49 | static DEFINE_RWLOCK(act_mod_lock); | |
50 | ||
51 | int tcf_register_action(struct tc_action_ops *act) | |
52 | { | |
53 | struct tc_action_ops *a, **ap; | |
54 | ||
55 | write_lock(&act_mod_lock); | |
56 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) { | |
57 | if (act->type == a->type || (strcmp(act->kind, a->kind) == 0)) { | |
58 | write_unlock(&act_mod_lock); | |
59 | return -EEXIST; | |
60 | } | |
61 | } | |
62 | act->next = NULL; | |
63 | *ap = act; | |
64 | write_unlock(&act_mod_lock); | |
65 | return 0; | |
66 | } | |
67 | ||
68 | int tcf_unregister_action(struct tc_action_ops *act) | |
69 | { | |
70 | struct tc_action_ops *a, **ap; | |
71 | int err = -ENOENT; | |
72 | ||
73 | write_lock(&act_mod_lock); | |
74 | for (ap = &act_base; (a = *ap) != NULL; ap = &a->next) | |
75 | if (a == act) | |
76 | break; | |
77 | if (a) { | |
78 | *ap = a->next; | |
79 | a->next = NULL; | |
80 | err = 0; | |
81 | } | |
82 | write_unlock(&act_mod_lock); | |
83 | return err; | |
84 | } | |
85 | ||
86 | /* lookup by name */ | |
87 | static struct tc_action_ops *tc_lookup_action_n(char *kind) | |
88 | { | |
89 | struct tc_action_ops *a = NULL; | |
90 | ||
91 | if (kind) { | |
92 | read_lock(&act_mod_lock); | |
93 | for (a = act_base; a; a = a->next) { | |
94 | if (strcmp(kind, a->kind) == 0) { | |
95 | if (!try_module_get(a->owner)) { | |
96 | read_unlock(&act_mod_lock); | |
97 | return NULL; | |
98 | } | |
99 | break; | |
100 | } | |
101 | } | |
102 | read_unlock(&act_mod_lock); | |
103 | } | |
104 | return a; | |
105 | } | |
106 | ||
107 | /* lookup by rtattr */ | |
108 | static struct tc_action_ops *tc_lookup_action(struct rtattr *kind) | |
109 | { | |
110 | struct tc_action_ops *a = NULL; | |
111 | ||
112 | if (kind) { | |
113 | read_lock(&act_mod_lock); | |
114 | for (a = act_base; a; a = a->next) { | |
115 | if (rtattr_strcmp(kind, a->kind) == 0) { | |
116 | if (!try_module_get(a->owner)) { | |
117 | read_unlock(&act_mod_lock); | |
118 | return NULL; | |
119 | } | |
120 | break; | |
121 | } | |
122 | } | |
123 | read_unlock(&act_mod_lock); | |
124 | } | |
125 | return a; | |
126 | } | |
127 | ||
128 | #if 0 | |
129 | /* lookup by id */ | |
130 | static struct tc_action_ops *tc_lookup_action_id(u32 type) | |
131 | { | |
132 | struct tc_action_ops *a = NULL; | |
133 | ||
134 | if (type) { | |
135 | read_lock(&act_mod_lock); | |
136 | for (a = act_base; a; a = a->next) { | |
137 | if (a->type == type) { | |
138 | if (!try_module_get(a->owner)) { | |
139 | read_unlock(&act_mod_lock); | |
140 | return NULL; | |
141 | } | |
142 | break; | |
143 | } | |
144 | } | |
145 | read_unlock(&act_mod_lock); | |
146 | } | |
147 | return a; | |
148 | } | |
149 | #endif | |
150 | ||
151 | int tcf_action_exec(struct sk_buff *skb, struct tc_action *act, | |
152 | struct tcf_result *res) | |
153 | { | |
154 | struct tc_action *a; | |
155 | int ret = -1; | |
156 | ||
157 | if (skb->tc_verd & TC_NCLS) { | |
158 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
159 | D2PRINTK("(%p)tcf_action_exec: cleared TC_NCLS in %s out %s\n", | |
160 | skb, skb->input_dev ? skb->input_dev->name : "xxx", | |
161 | skb->dev->name); | |
162 | ret = TC_ACT_OK; | |
163 | goto exec_done; | |
164 | } | |
165 | while ((a = act) != NULL) { | |
166 | repeat: | |
167 | if (a->ops && a->ops->act) { | |
168 | ret = a->ops->act(&skb, a); | |
169 | if (TC_MUNGED & skb->tc_verd) { | |
170 | /* copied already, allow trampling */ | |
171 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); | |
172 | skb->tc_verd = CLR_TC_MUNGED(skb->tc_verd); | |
173 | } | |
174 | if (ret != TC_ACT_PIPE) | |
175 | goto exec_done; | |
176 | if (ret == TC_ACT_REPEAT) | |
177 | goto repeat; /* we need a ttl - JHS */ | |
178 | } | |
179 | act = a->next; | |
180 | } | |
181 | exec_done: | |
182 | if (skb->tc_classid > 0) { | |
183 | res->classid = skb->tc_classid; | |
184 | res->class = 0; | |
185 | skb->tc_classid = 0; | |
186 | } | |
187 | return ret; | |
188 | } | |
189 | ||
190 | void tcf_action_destroy(struct tc_action *act, int bind) | |
191 | { | |
192 | struct tc_action *a; | |
193 | ||
194 | for (a = act; a; a = act) { | |
195 | if (a->ops && a->ops->cleanup) { | |
196 | DPRINTK("tcf_action_destroy destroying %p next %p\n", | |
197 | a, a->next); | |
198 | if (a->ops->cleanup(a, bind) == ACT_P_DELETED) | |
199 | module_put(a->ops->owner); | |
200 | act = act->next; | |
201 | kfree(a); | |
202 | } else { /*FIXME: Remove later - catch insertion bugs*/ | |
203 | printk("tcf_action_destroy: BUG? destroying NULL ops\n"); | |
204 | act = act->next; | |
205 | kfree(a); | |
206 | } | |
207 | } | |
208 | } | |
209 | ||
210 | int | |
211 | tcf_action_dump_old(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
212 | { | |
213 | int err = -EINVAL; | |
214 | ||
215 | if (a->ops == NULL || a->ops->dump == NULL) | |
216 | return err; | |
217 | return a->ops->dump(skb, a, bind, ref); | |
218 | } | |
219 | ||
220 | int | |
221 | tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) | |
222 | { | |
223 | int err = -EINVAL; | |
224 | unsigned char *b = skb->tail; | |
225 | struct rtattr *r; | |
226 | ||
227 | if (a->ops == NULL || a->ops->dump == NULL) | |
228 | return err; | |
229 | ||
230 | RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind); | |
231 | if (tcf_action_copy_stats(skb, a, 0)) | |
232 | goto rtattr_failure; | |
233 | r = (struct rtattr*) skb->tail; | |
234 | RTA_PUT(skb, TCA_OPTIONS, 0, NULL); | |
235 | if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) { | |
236 | r->rta_len = skb->tail - (u8*)r; | |
237 | return err; | |
238 | } | |
239 | ||
240 | rtattr_failure: | |
241 | skb_trim(skb, b - skb->data); | |
242 | return -1; | |
243 | } | |
244 | ||
245 | int | |
246 | tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref) | |
247 | { | |
248 | struct tc_action *a; | |
249 | int err = -EINVAL; | |
250 | unsigned char *b = skb->tail; | |
251 | struct rtattr *r ; | |
252 | ||
253 | while ((a = act) != NULL) { | |
254 | r = (struct rtattr*) skb->tail; | |
255 | act = a->next; | |
256 | RTA_PUT(skb, a->order, 0, NULL); | |
257 | err = tcf_action_dump_1(skb, a, bind, ref); | |
258 | if (err < 0) | |
259 | goto rtattr_failure; | |
260 | r->rta_len = skb->tail - (u8*)r; | |
261 | } | |
262 | ||
263 | return 0; | |
264 | ||
265 | rtattr_failure: | |
266 | skb_trim(skb, b - skb->data); | |
267 | return -err; | |
268 | } | |
269 | ||
270 | struct tc_action *tcf_action_init_1(struct rtattr *rta, struct rtattr *est, | |
271 | char *name, int ovr, int bind, int *err) | |
272 | { | |
273 | struct tc_action *a; | |
274 | struct tc_action_ops *a_o; | |
275 | char act_name[IFNAMSIZ]; | |
276 | struct rtattr *tb[TCA_ACT_MAX+1]; | |
277 | struct rtattr *kind; | |
278 | ||
279 | *err = -EINVAL; | |
280 | ||
281 | if (name == NULL) { | |
282 | if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0) | |
283 | goto err_out; | |
284 | kind = tb[TCA_ACT_KIND-1]; | |
285 | if (kind == NULL) | |
286 | goto err_out; | |
287 | if (rtattr_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) | |
288 | goto err_out; | |
289 | } else { | |
290 | if (strlcpy(act_name, name, IFNAMSIZ) >= IFNAMSIZ) | |
291 | goto err_out; | |
292 | } | |
293 | ||
294 | a_o = tc_lookup_action_n(act_name); | |
295 | if (a_o == NULL) { | |
296 | #ifdef CONFIG_KMOD | |
297 | rtnl_unlock(); | |
298 | request_module(act_name); | |
299 | rtnl_lock(); | |
300 | ||
301 | a_o = tc_lookup_action_n(act_name); | |
302 | ||
303 | /* We dropped the RTNL semaphore in order to | |
304 | * perform the module load. So, even if we | |
305 | * succeeded in loading the module we have to | |
306 | * tell the caller to replay the request. We | |
307 | * indicate this using -EAGAIN. | |
308 | */ | |
309 | if (a_o != NULL) { | |
310 | *err = -EAGAIN; | |
311 | goto err_mod; | |
312 | } | |
313 | #endif | |
314 | goto err_out; | |
315 | } | |
316 | ||
317 | *err = -ENOMEM; | |
318 | a = kmalloc(sizeof(*a), GFP_KERNEL); | |
319 | if (a == NULL) | |
320 | goto err_mod; | |
321 | memset(a, 0, sizeof(*a)); | |
322 | ||
323 | /* backward compatibility for policer */ | |
324 | if (name == NULL) | |
325 | *err = a_o->init(tb[TCA_ACT_OPTIONS-1], est, a, ovr, bind); | |
326 | else | |
327 | *err = a_o->init(rta, est, a, ovr, bind); | |
328 | if (*err < 0) | |
329 | goto err_free; | |
330 | ||
331 | /* module count goes up only when brand new policy is created | |
332 | if it exists and is only bound to in a_o->init() then | |
333 | ACT_P_CREATED is not returned (a zero is). | |
334 | */ | |
335 | if (*err != ACT_P_CREATED) | |
336 | module_put(a_o->owner); | |
337 | a->ops = a_o; | |
338 | DPRINTK("tcf_action_init_1: successfull %s\n", act_name); | |
339 | ||
340 | *err = 0; | |
341 | return a; | |
342 | ||
343 | err_free: | |
344 | kfree(a); | |
345 | err_mod: | |
346 | module_put(a_o->owner); | |
347 | err_out: | |
348 | return NULL; | |
349 | } | |
350 | ||
351 | struct tc_action *tcf_action_init(struct rtattr *rta, struct rtattr *est, | |
352 | char *name, int ovr, int bind, int *err) | |
353 | { | |
354 | struct rtattr *tb[TCA_ACT_MAX_PRIO+1]; | |
355 | struct tc_action *head = NULL, *act, *act_prev = NULL; | |
356 | int i; | |
357 | ||
358 | if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0) { | |
359 | *err = -EINVAL; | |
360 | return head; | |
361 | } | |
362 | ||
363 | for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) { | |
364 | act = tcf_action_init_1(tb[i], est, name, ovr, bind, err); | |
365 | if (act == NULL) | |
366 | goto err; | |
367 | act->order = i+1; | |
368 | ||
369 | if (head == NULL) | |
370 | head = act; | |
371 | else | |
372 | act_prev->next = act; | |
373 | act_prev = act; | |
374 | } | |
375 | return head; | |
376 | ||
377 | err: | |
378 | if (head != NULL) | |
379 | tcf_action_destroy(head, bind); | |
380 | return NULL; | |
381 | } | |
382 | ||
383 | int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a, | |
384 | int compat_mode) | |
385 | { | |
386 | int err = 0; | |
387 | struct gnet_dump d; | |
388 | struct tcf_act_hdr *h = a->priv; | |
389 | ||
390 | if (h == NULL) | |
391 | goto errout; | |
392 | ||
393 | /* compat_mode being true specifies a call that is supposed | |
394 | * to add additional backward compatiblity statistic TLVs. | |
395 | */ | |
396 | if (compat_mode) { | |
397 | if (a->type == TCA_OLD_COMPAT) | |
398 | err = gnet_stats_start_copy_compat(skb, 0, | |
399 | TCA_STATS, TCA_XSTATS, h->stats_lock, &d); | |
400 | else | |
401 | return 0; | |
402 | } else | |
403 | err = gnet_stats_start_copy(skb, TCA_ACT_STATS, | |
404 | h->stats_lock, &d); | |
405 | ||
406 | if (err < 0) | |
407 | goto errout; | |
408 | ||
409 | if (a->ops != NULL && a->ops->get_stats != NULL) | |
410 | if (a->ops->get_stats(skb, a) < 0) | |
411 | goto errout; | |
412 | ||
413 | if (gnet_stats_copy_basic(&d, &h->bstats) < 0 || | |
414 | #ifdef CONFIG_NET_ESTIMATOR | |
415 | gnet_stats_copy_rate_est(&d, &h->rate_est) < 0 || | |
416 | #endif | |
417 | gnet_stats_copy_queue(&d, &h->qstats) < 0) | |
418 | goto errout; | |
419 | ||
420 | if (gnet_stats_finish_copy(&d) < 0) | |
421 | goto errout; | |
422 | ||
423 | return 0; | |
424 | ||
425 | errout: | |
426 | return -1; | |
427 | } | |
428 | ||
429 | static int | |
430 | tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq, | |
431 | unsigned flags, int event, int bind, int ref) | |
432 | { | |
433 | struct tcamsg *t; | |
434 | struct nlmsghdr *nlh; | |
435 | unsigned char *b = skb->tail; | |
436 | struct rtattr *x; | |
437 | ||
438 | nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*t)); | |
439 | nlh->nlmsg_flags = flags; | |
440 | t = NLMSG_DATA(nlh); | |
441 | t->tca_family = AF_UNSPEC; | |
442 | ||
443 | x = (struct rtattr*) skb->tail; | |
444 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); | |
445 | ||
446 | if (tcf_action_dump(skb, a, bind, ref) < 0) | |
447 | goto rtattr_failure; | |
448 | ||
449 | x->rta_len = skb->tail - (u8*)x; | |
450 | ||
451 | nlh->nlmsg_len = skb->tail - b; | |
452 | return skb->len; | |
453 | ||
454 | rtattr_failure: | |
455 | nlmsg_failure: | |
456 | skb_trim(skb, b - skb->data); | |
457 | return -1; | |
458 | } | |
459 | ||
460 | static int | |
461 | act_get_notify(u32 pid, struct nlmsghdr *n, struct tc_action *a, int event) | |
462 | { | |
463 | struct sk_buff *skb; | |
464 | int err = 0; | |
465 | ||
466 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
467 | if (!skb) | |
468 | return -ENOBUFS; | |
469 | if (tca_get_fill(skb, a, pid, n->nlmsg_seq, 0, event, 0, 0) <= 0) { | |
470 | kfree_skb(skb); | |
471 | return -EINVAL; | |
472 | } | |
473 | err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); | |
474 | if (err > 0) | |
475 | err = 0; | |
476 | return err; | |
477 | } | |
478 | ||
479 | static struct tc_action * | |
480 | tcf_action_get_1(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int *err) | |
481 | { | |
482 | struct rtattr *tb[TCA_ACT_MAX+1]; | |
483 | struct tc_action *a; | |
484 | int index; | |
485 | ||
486 | *err = -EINVAL; | |
487 | if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0) | |
488 | return NULL; | |
489 | ||
490 | if (tb[TCA_ACT_INDEX - 1] == NULL || | |
491 | RTA_PAYLOAD(tb[TCA_ACT_INDEX - 1]) < sizeof(index)) | |
492 | return NULL; | |
493 | index = *(int *)RTA_DATA(tb[TCA_ACT_INDEX - 1]); | |
494 | ||
495 | *err = -ENOMEM; | |
496 | a = kmalloc(sizeof(struct tc_action), GFP_KERNEL); | |
497 | if (a == NULL) | |
498 | return NULL; | |
499 | memset(a, 0, sizeof(struct tc_action)); | |
500 | ||
501 | *err = -EINVAL; | |
502 | a->ops = tc_lookup_action(tb[TCA_ACT_KIND - 1]); | |
503 | if (a->ops == NULL) | |
504 | goto err_free; | |
505 | if (a->ops->lookup == NULL) | |
506 | goto err_mod; | |
507 | *err = -ENOENT; | |
508 | if (a->ops->lookup(a, index) == 0) | |
509 | goto err_mod; | |
510 | ||
511 | module_put(a->ops->owner); | |
512 | *err = 0; | |
513 | return a; | |
514 | err_mod: | |
515 | module_put(a->ops->owner); | |
516 | err_free: | |
517 | kfree(a); | |
518 | return NULL; | |
519 | } | |
520 | ||
521 | static void cleanup_a(struct tc_action *act) | |
522 | { | |
523 | struct tc_action *a; | |
524 | ||
525 | for (a = act; a; a = act) { | |
526 | act = a->next; | |
527 | kfree(a); | |
528 | } | |
529 | } | |
530 | ||
531 | static struct tc_action *create_a(int i) | |
532 | { | |
533 | struct tc_action *act; | |
534 | ||
535 | act = kmalloc(sizeof(*act), GFP_KERNEL); | |
536 | if (act == NULL) { | |
537 | printk("create_a: failed to alloc!\n"); | |
538 | return NULL; | |
539 | } | |
540 | memset(act, 0, sizeof(*act)); | |
541 | act->order = i; | |
542 | return act; | |
543 | } | |
544 | ||
545 | static int tca_action_flush(struct rtattr *rta, struct nlmsghdr *n, u32 pid) | |
546 | { | |
547 | struct sk_buff *skb; | |
548 | unsigned char *b; | |
549 | struct nlmsghdr *nlh; | |
550 | struct tcamsg *t; | |
551 | struct netlink_callback dcb; | |
552 | struct rtattr *x; | |
553 | struct rtattr *tb[TCA_ACT_MAX+1]; | |
554 | struct rtattr *kind; | |
555 | struct tc_action *a = create_a(0); | |
556 | int err = -EINVAL; | |
557 | ||
558 | if (a == NULL) { | |
559 | printk("tca_action_flush: couldnt create tc_action\n"); | |
560 | return err; | |
561 | } | |
562 | ||
563 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
564 | if (!skb) { | |
565 | printk("tca_action_flush: failed skb alloc\n"); | |
566 | kfree(a); | |
567 | return -ENOBUFS; | |
568 | } | |
569 | ||
570 | b = (unsigned char *)skb->tail; | |
571 | ||
572 | if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0) | |
573 | goto err_out; | |
574 | ||
575 | kind = tb[TCA_ACT_KIND-1]; | |
576 | a->ops = tc_lookup_action(kind); | |
577 | if (a->ops == NULL) | |
578 | goto err_out; | |
579 | ||
580 | nlh = NLMSG_PUT(skb, pid, n->nlmsg_seq, RTM_DELACTION, sizeof(*t)); | |
581 | t = NLMSG_DATA(nlh); | |
582 | t->tca_family = AF_UNSPEC; | |
583 | ||
584 | x = (struct rtattr *) skb->tail; | |
585 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); | |
586 | ||
587 | err = a->ops->walk(skb, &dcb, RTM_DELACTION, a); | |
588 | if (err < 0) | |
589 | goto rtattr_failure; | |
590 | ||
591 | x->rta_len = skb->tail - (u8 *) x; | |
592 | ||
593 | nlh->nlmsg_len = skb->tail - b; | |
594 | nlh->nlmsg_flags |= NLM_F_ROOT; | |
595 | module_put(a->ops->owner); | |
596 | kfree(a); | |
597 | err = rtnetlink_send(skb, pid, RTMGRP_TC, n->nlmsg_flags&NLM_F_ECHO); | |
598 | if (err > 0) | |
599 | return 0; | |
600 | ||
601 | return err; | |
602 | ||
603 | rtattr_failure: | |
604 | module_put(a->ops->owner); | |
605 | nlmsg_failure: | |
606 | err_out: | |
607 | kfree_skb(skb); | |
608 | kfree(a); | |
609 | return err; | |
610 | } | |
611 | ||
612 | static int | |
613 | tca_action_gd(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int event) | |
614 | { | |
615 | int i, ret = 0; | |
616 | struct rtattr *tb[TCA_ACT_MAX_PRIO+1]; | |
617 | struct tc_action *head = NULL, *act, *act_prev = NULL; | |
618 | ||
619 | if (rtattr_parse_nested(tb, TCA_ACT_MAX_PRIO, rta) < 0) | |
620 | return -EINVAL; | |
621 | ||
622 | if (event == RTM_DELACTION && n->nlmsg_flags&NLM_F_ROOT) { | |
623 | if (tb[0] != NULL && tb[1] == NULL) | |
624 | return tca_action_flush(tb[0], n, pid); | |
625 | } | |
626 | ||
627 | for (i=0; i < TCA_ACT_MAX_PRIO && tb[i]; i++) { | |
628 | act = tcf_action_get_1(tb[i], n, pid, &ret); | |
629 | if (act == NULL) | |
630 | goto err; | |
631 | act->order = i+1; | |
632 | ||
633 | if (head == NULL) | |
634 | head = act; | |
635 | else | |
636 | act_prev->next = act; | |
637 | act_prev = act; | |
638 | } | |
639 | ||
640 | if (event == RTM_GETACTION) | |
641 | ret = act_get_notify(pid, n, head, event); | |
642 | else { /* delete */ | |
643 | struct sk_buff *skb; | |
644 | ||
645 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
646 | if (!skb) { | |
647 | ret = -ENOBUFS; | |
648 | goto err; | |
649 | } | |
650 | ||
651 | if (tca_get_fill(skb, head, pid, n->nlmsg_seq, 0, event, | |
652 | 0, 1) <= 0) { | |
653 | kfree_skb(skb); | |
654 | ret = -EINVAL; | |
655 | goto err; | |
656 | } | |
657 | ||
658 | /* now do the delete */ | |
659 | tcf_action_destroy(head, 0); | |
660 | ret = rtnetlink_send(skb, pid, RTMGRP_TC, | |
661 | n->nlmsg_flags&NLM_F_ECHO); | |
662 | if (ret > 0) | |
663 | return 0; | |
664 | return ret; | |
665 | } | |
666 | err: | |
667 | cleanup_a(head); | |
668 | return ret; | |
669 | } | |
670 | ||
671 | static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event, | |
672 | unsigned flags) | |
673 | { | |
674 | struct tcamsg *t; | |
675 | struct nlmsghdr *nlh; | |
676 | struct sk_buff *skb; | |
677 | struct rtattr *x; | |
678 | unsigned char *b; | |
679 | int err = 0; | |
680 | ||
681 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
682 | if (!skb) | |
683 | return -ENOBUFS; | |
684 | ||
685 | b = (unsigned char *)skb->tail; | |
686 | ||
687 | nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*t)); | |
688 | nlh->nlmsg_flags = flags; | |
689 | t = NLMSG_DATA(nlh); | |
690 | t->tca_family = AF_UNSPEC; | |
691 | ||
692 | x = (struct rtattr*) skb->tail; | |
693 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); | |
694 | ||
695 | if (tcf_action_dump(skb, a, 0, 0) < 0) | |
696 | goto rtattr_failure; | |
697 | ||
698 | x->rta_len = skb->tail - (u8*)x; | |
699 | ||
700 | nlh->nlmsg_len = skb->tail - b; | |
701 | NETLINK_CB(skb).dst_groups = RTMGRP_TC; | |
702 | ||
703 | err = rtnetlink_send(skb, pid, RTMGRP_TC, flags&NLM_F_ECHO); | |
704 | if (err > 0) | |
705 | err = 0; | |
706 | return err; | |
707 | ||
708 | rtattr_failure: | |
709 | nlmsg_failure: | |
710 | skb_trim(skb, b - skb->data); | |
711 | return -1; | |
712 | } | |
713 | ||
714 | ||
715 | static int | |
716 | tcf_action_add(struct rtattr *rta, struct nlmsghdr *n, u32 pid, int ovr) | |
717 | { | |
718 | int ret = 0; | |
719 | struct tc_action *act; | |
720 | struct tc_action *a; | |
721 | u32 seq = n->nlmsg_seq; | |
722 | ||
723 | act = tcf_action_init(rta, NULL, NULL, ovr, 0, &ret); | |
724 | if (act == NULL) | |
725 | goto done; | |
726 | ||
727 | /* dump then free all the actions after update; inserted policy | |
728 | * stays intact | |
729 | * */ | |
730 | ret = tcf_add_notify(act, pid, seq, RTM_NEWACTION, n->nlmsg_flags); | |
731 | for (a = act; a; a = act) { | |
732 | act = a->next; | |
733 | kfree(a); | |
734 | } | |
735 | done: | |
736 | return ret; | |
737 | } | |
738 | ||
739 | static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg) | |
740 | { | |
741 | struct rtattr **tca = arg; | |
742 | u32 pid = skb ? NETLINK_CB(skb).pid : 0; | |
743 | int ret = 0, ovr = 0; | |
744 | ||
745 | if (tca[TCA_ACT_TAB-1] == NULL) { | |
746 | printk("tc_ctl_action: received NO action attribs\n"); | |
747 | return -EINVAL; | |
748 | } | |
749 | ||
750 | /* n->nlmsg_flags&NLM_F_CREATE | |
751 | * */ | |
752 | switch (n->nlmsg_type) { | |
753 | case RTM_NEWACTION: | |
754 | /* we are going to assume all other flags | |
755 | * imply create only if it doesnt exist | |
756 | * Note that CREATE | EXCL implies that | |
757 | * but since we want avoid ambiguity (eg when flags | |
758 | * is zero) then just set this | |
759 | */ | |
760 | if (n->nlmsg_flags&NLM_F_REPLACE) | |
761 | ovr = 1; | |
762 | replay: | |
763 | ret = tcf_action_add(tca[TCA_ACT_TAB-1], n, pid, ovr); | |
764 | if (ret == -EAGAIN) | |
765 | goto replay; | |
766 | break; | |
767 | case RTM_DELACTION: | |
768 | ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_DELACTION); | |
769 | break; | |
770 | case RTM_GETACTION: | |
771 | ret = tca_action_gd(tca[TCA_ACT_TAB-1], n, pid, RTM_GETACTION); | |
772 | break; | |
773 | default: | |
774 | BUG(); | |
775 | } | |
776 | ||
777 | return ret; | |
778 | } | |
779 | ||
780 | static char * | |
781 | find_dump_kind(struct nlmsghdr *n) | |
782 | { | |
783 | struct rtattr *tb1, *tb2[TCA_ACT_MAX+1]; | |
784 | struct rtattr *tb[TCA_ACT_MAX_PRIO + 1]; | |
785 | struct rtattr *rta[TCAA_MAX + 1]; | |
786 | struct rtattr *kind; | |
787 | int min_len = NLMSG_LENGTH(sizeof(struct tcamsg)); | |
788 | int attrlen = n->nlmsg_len - NLMSG_ALIGN(min_len); | |
789 | struct rtattr *attr = (void *) n + NLMSG_ALIGN(min_len); | |
790 | ||
791 | if (rtattr_parse(rta, TCAA_MAX, attr, attrlen) < 0) | |
792 | return NULL; | |
793 | tb1 = rta[TCA_ACT_TAB - 1]; | |
794 | if (tb1 == NULL) | |
795 | return NULL; | |
796 | ||
797 | if (rtattr_parse(tb, TCA_ACT_MAX_PRIO, RTA_DATA(tb1), | |
798 | NLMSG_ALIGN(RTA_PAYLOAD(tb1))) < 0) | |
799 | return NULL; | |
800 | if (tb[0] == NULL) | |
801 | return NULL; | |
802 | ||
803 | if (rtattr_parse(tb2, TCA_ACT_MAX, RTA_DATA(tb[0]), | |
804 | RTA_PAYLOAD(tb[0])) < 0) | |
805 | return NULL; | |
806 | kind = tb2[TCA_ACT_KIND-1]; | |
807 | ||
808 | return (char *) RTA_DATA(kind); | |
809 | } | |
810 | ||
811 | static int | |
812 | tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) | |
813 | { | |
814 | struct nlmsghdr *nlh; | |
815 | unsigned char *b = skb->tail; | |
816 | struct rtattr *x; | |
817 | struct tc_action_ops *a_o; | |
818 | struct tc_action a; | |
819 | int ret = 0; | |
820 | struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh); | |
821 | char *kind = find_dump_kind(cb->nlh); | |
822 | ||
823 | if (kind == NULL) { | |
824 | printk("tc_dump_action: action bad kind\n"); | |
825 | return 0; | |
826 | } | |
827 | ||
828 | a_o = tc_lookup_action_n(kind); | |
829 | if (a_o == NULL) { | |
830 | printk("failed to find %s\n", kind); | |
831 | return 0; | |
832 | } | |
833 | ||
834 | memset(&a, 0, sizeof(struct tc_action)); | |
835 | a.ops = a_o; | |
836 | ||
837 | if (a_o->walk == NULL) { | |
838 | printk("tc_dump_action: %s !capable of dumping table\n", kind); | |
839 | goto rtattr_failure; | |
840 | } | |
841 | ||
842 | nlh = NLMSG_PUT(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, | |
843 | cb->nlh->nlmsg_type, sizeof(*t)); | |
844 | t = NLMSG_DATA(nlh); | |
845 | t->tca_family = AF_UNSPEC; | |
846 | ||
847 | x = (struct rtattr *) skb->tail; | |
848 | RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); | |
849 | ||
850 | ret = a_o->walk(skb, cb, RTM_GETACTION, &a); | |
851 | if (ret < 0) | |
852 | goto rtattr_failure; | |
853 | ||
854 | if (ret > 0) { | |
855 | x->rta_len = skb->tail - (u8 *) x; | |
856 | ret = skb->len; | |
857 | } else | |
858 | skb_trim(skb, (u8*)x - skb->data); | |
859 | ||
860 | nlh->nlmsg_len = skb->tail - b; | |
861 | if (NETLINK_CB(cb->skb).pid && ret) | |
862 | nlh->nlmsg_flags |= NLM_F_MULTI; | |
863 | module_put(a_o->owner); | |
864 | return skb->len; | |
865 | ||
866 | rtattr_failure: | |
867 | nlmsg_failure: | |
868 | module_put(a_o->owner); | |
869 | skb_trim(skb, b - skb->data); | |
870 | return skb->len; | |
871 | } | |
872 | ||
873 | static int __init tc_action_init(void) | |
874 | { | |
875 | struct rtnetlink_link *link_p = rtnetlink_links[PF_UNSPEC]; | |
876 | ||
877 | if (link_p) { | |
878 | link_p[RTM_NEWACTION-RTM_BASE].doit = tc_ctl_action; | |
879 | link_p[RTM_DELACTION-RTM_BASE].doit = tc_ctl_action; | |
880 | link_p[RTM_GETACTION-RTM_BASE].doit = tc_ctl_action; | |
881 | link_p[RTM_GETACTION-RTM_BASE].dumpit = tc_dump_action; | |
882 | } | |
883 | ||
884 | printk("TC classifier action (bugs to netdev@oss.sgi.com cc " | |
885 | "hadi@cyberus.ca)\n"); | |
886 | return 0; | |
887 | } | |
888 | ||
889 | subsys_initcall(tc_action_init); | |
890 | ||
891 | EXPORT_SYMBOL(tcf_register_action); | |
892 | EXPORT_SYMBOL(tcf_unregister_action); | |
893 | EXPORT_SYMBOL(tcf_action_exec); | |
894 | EXPORT_SYMBOL(tcf_action_dump_1); |