Commit | Line | Data |
---|---|---|
14c0b97d TG |
1 | /* |
2 | * net/core/fib_rules.c Generic Routing Rules | |
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 as | |
6 | * published by the Free Software Foundation, version 2. | |
7 | * | |
8 | * Authors: Thomas Graf <tgraf@suug.ch> | |
9 | */ | |
10 | ||
14c0b97d TG |
11 | #include <linux/types.h> |
12 | #include <linux/kernel.h> | |
13 | #include <linux/list.h> | |
14 | #include <net/fib_rules.h> | |
15 | ||
16 | static LIST_HEAD(rules_ops); | |
17 | static DEFINE_SPINLOCK(rules_mod_lock); | |
18 | ||
19 | static void notify_rule_change(int event, struct fib_rule *rule, | |
c17084d2 TG |
20 | struct fib_rules_ops *ops, struct nlmsghdr *nlh, |
21 | u32 pid); | |
14c0b97d TG |
22 | |
23 | static struct fib_rules_ops *lookup_rules_ops(int family) | |
24 | { | |
25 | struct fib_rules_ops *ops; | |
26 | ||
27 | rcu_read_lock(); | |
28 | list_for_each_entry_rcu(ops, &rules_ops, list) { | |
29 | if (ops->family == family) { | |
30 | if (!try_module_get(ops->owner)) | |
31 | ops = NULL; | |
32 | rcu_read_unlock(); | |
33 | return ops; | |
34 | } | |
35 | } | |
36 | rcu_read_unlock(); | |
37 | ||
38 | return NULL; | |
39 | } | |
40 | ||
41 | static void rules_ops_put(struct fib_rules_ops *ops) | |
42 | { | |
43 | if (ops) | |
44 | module_put(ops->owner); | |
45 | } | |
46 | ||
47 | int fib_rules_register(struct fib_rules_ops *ops) | |
48 | { | |
49 | int err = -EEXIST; | |
50 | struct fib_rules_ops *o; | |
51 | ||
52 | if (ops->rule_size < sizeof(struct fib_rule)) | |
53 | return -EINVAL; | |
54 | ||
55 | if (ops->match == NULL || ops->configure == NULL || | |
56 | ops->compare == NULL || ops->fill == NULL || | |
57 | ops->action == NULL) | |
58 | return -EINVAL; | |
59 | ||
60 | spin_lock(&rules_mod_lock); | |
61 | list_for_each_entry(o, &rules_ops, list) | |
62 | if (ops->family == o->family) | |
63 | goto errout; | |
64 | ||
65 | list_add_tail_rcu(&ops->list, &rules_ops); | |
66 | err = 0; | |
67 | errout: | |
68 | spin_unlock(&rules_mod_lock); | |
69 | ||
70 | return err; | |
71 | } | |
72 | ||
73 | EXPORT_SYMBOL_GPL(fib_rules_register); | |
74 | ||
75 | static void cleanup_ops(struct fib_rules_ops *ops) | |
76 | { | |
77 | struct fib_rule *rule, *tmp; | |
78 | ||
79 | list_for_each_entry_safe(rule, tmp, ops->rules_list, list) { | |
80 | list_del_rcu(&rule->list); | |
81 | fib_rule_put(rule); | |
82 | } | |
83 | } | |
84 | ||
85 | int fib_rules_unregister(struct fib_rules_ops *ops) | |
86 | { | |
87 | int err = 0; | |
88 | struct fib_rules_ops *o; | |
89 | ||
90 | spin_lock(&rules_mod_lock); | |
91 | list_for_each_entry(o, &rules_ops, list) { | |
92 | if (o == ops) { | |
93 | list_del_rcu(&o->list); | |
94 | cleanup_ops(ops); | |
95 | goto out; | |
96 | } | |
97 | } | |
98 | ||
99 | err = -ENOENT; | |
100 | out: | |
101 | spin_unlock(&rules_mod_lock); | |
102 | ||
103 | synchronize_rcu(); | |
104 | ||
105 | return err; | |
106 | } | |
107 | ||
108 | EXPORT_SYMBOL_GPL(fib_rules_unregister); | |
109 | ||
3dfbcc41 TG |
110 | static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops, |
111 | struct flowi *fl, int flags) | |
112 | { | |
113 | int ret = 0; | |
114 | ||
115 | if (rule->ifindex && (rule->ifindex != fl->iif)) | |
116 | goto out; | |
117 | ||
118 | if ((rule->mark ^ fl->mark) & rule->mark_mask) | |
119 | goto out; | |
120 | ||
121 | ret = ops->match(rule, fl, flags); | |
122 | out: | |
123 | return (rule->flags & FIB_RULE_INVERT) ? !ret : ret; | |
124 | } | |
125 | ||
14c0b97d TG |
126 | int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl, |
127 | int flags, struct fib_lookup_arg *arg) | |
128 | { | |
129 | struct fib_rule *rule; | |
130 | int err; | |
131 | ||
132 | rcu_read_lock(); | |
133 | ||
134 | list_for_each_entry_rcu(rule, ops->rules_list, list) { | |
0947c9fe | 135 | jumped: |
3dfbcc41 | 136 | if (!fib_rule_match(rule, ops, fl, flags)) |
14c0b97d TG |
137 | continue; |
138 | ||
0947c9fe TG |
139 | if (rule->action == FR_ACT_GOTO) { |
140 | struct fib_rule *target; | |
141 | ||
142 | target = rcu_dereference(rule->ctarget); | |
143 | if (target == NULL) { | |
144 | continue; | |
145 | } else { | |
146 | rule = target; | |
147 | goto jumped; | |
148 | } | |
fa0b2d1d TG |
149 | } else if (rule->action == FR_ACT_NOP) |
150 | continue; | |
151 | else | |
0947c9fe TG |
152 | err = ops->action(rule, fl, flags, arg); |
153 | ||
14c0b97d TG |
154 | if (err != -EAGAIN) { |
155 | fib_rule_get(rule); | |
156 | arg->rule = rule; | |
157 | goto out; | |
158 | } | |
159 | } | |
160 | ||
83886b6b | 161 | err = -ESRCH; |
14c0b97d TG |
162 | out: |
163 | rcu_read_unlock(); | |
164 | ||
165 | return err; | |
166 | } | |
167 | ||
168 | EXPORT_SYMBOL_GPL(fib_rules_lookup); | |
169 | ||
e1701c68 TG |
170 | static int validate_rulemsg(struct fib_rule_hdr *frh, struct nlattr **tb, |
171 | struct fib_rules_ops *ops) | |
172 | { | |
173 | int err = -EINVAL; | |
174 | ||
175 | if (frh->src_len) | |
176 | if (tb[FRA_SRC] == NULL || | |
177 | frh->src_len > (ops->addr_size * 8) || | |
178 | nla_len(tb[FRA_SRC]) != ops->addr_size) | |
179 | goto errout; | |
180 | ||
181 | if (frh->dst_len) | |
182 | if (tb[FRA_DST] == NULL || | |
183 | frh->dst_len > (ops->addr_size * 8) || | |
184 | nla_len(tb[FRA_DST]) != ops->addr_size) | |
185 | goto errout; | |
186 | ||
187 | err = 0; | |
188 | errout: | |
189 | return err; | |
190 | } | |
191 | ||
9d9e6a58 | 192 | static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
14c0b97d TG |
193 | { |
194 | struct fib_rule_hdr *frh = nlmsg_data(nlh); | |
195 | struct fib_rules_ops *ops = NULL; | |
196 | struct fib_rule *rule, *r, *last = NULL; | |
197 | struct nlattr *tb[FRA_MAX+1]; | |
0947c9fe | 198 | int err = -EINVAL, unresolved = 0; |
14c0b97d TG |
199 | |
200 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) | |
201 | goto errout; | |
202 | ||
203 | ops = lookup_rules_ops(frh->family); | |
204 | if (ops == NULL) { | |
205 | err = EAFNOSUPPORT; | |
206 | goto errout; | |
207 | } | |
208 | ||
209 | err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy); | |
210 | if (err < 0) | |
211 | goto errout; | |
212 | ||
e1701c68 TG |
213 | err = validate_rulemsg(frh, tb, ops); |
214 | if (err < 0) | |
215 | goto errout; | |
216 | ||
14c0b97d TG |
217 | rule = kzalloc(ops->rule_size, GFP_KERNEL); |
218 | if (rule == NULL) { | |
219 | err = -ENOMEM; | |
220 | goto errout; | |
221 | } | |
222 | ||
223 | if (tb[FRA_PRIORITY]) | |
224 | rule->pref = nla_get_u32(tb[FRA_PRIORITY]); | |
225 | ||
226 | if (tb[FRA_IFNAME]) { | |
227 | struct net_device *dev; | |
228 | ||
229 | rule->ifindex = -1; | |
5176f91e | 230 | nla_strlcpy(rule->ifname, tb[FRA_IFNAME], IFNAMSIZ); |
14c0b97d TG |
231 | dev = __dev_get_by_name(rule->ifname); |
232 | if (dev) | |
233 | rule->ifindex = dev->ifindex; | |
234 | } | |
235 | ||
b8964ed9 TG |
236 | if (tb[FRA_FWMARK]) { |
237 | rule->mark = nla_get_u32(tb[FRA_FWMARK]); | |
238 | if (rule->mark) | |
239 | /* compatibility: if the mark value is non-zero all bits | |
240 | * are compared unless a mask is explicitly specified. | |
241 | */ | |
242 | rule->mark_mask = 0xFFFFFFFF; | |
243 | } | |
244 | ||
245 | if (tb[FRA_FWMASK]) | |
246 | rule->mark_mask = nla_get_u32(tb[FRA_FWMASK]); | |
247 | ||
14c0b97d TG |
248 | rule->action = frh->action; |
249 | rule->flags = frh->flags; | |
9e762a4a | 250 | rule->table = frh_get_table(frh, tb); |
14c0b97d TG |
251 | |
252 | if (!rule->pref && ops->default_pref) | |
253 | rule->pref = ops->default_pref(); | |
254 | ||
0947c9fe TG |
255 | err = -EINVAL; |
256 | if (tb[FRA_GOTO]) { | |
257 | if (rule->action != FR_ACT_GOTO) | |
258 | goto errout_free; | |
259 | ||
260 | rule->target = nla_get_u32(tb[FRA_GOTO]); | |
261 | /* Backward jumps are prohibited to avoid endless loops */ | |
262 | if (rule->target <= rule->pref) | |
263 | goto errout_free; | |
264 | ||
265 | list_for_each_entry(r, ops->rules_list, list) { | |
266 | if (r->pref == rule->target) { | |
267 | rule->ctarget = r; | |
268 | break; | |
269 | } | |
270 | } | |
271 | ||
272 | if (rule->ctarget == NULL) | |
273 | unresolved = 1; | |
274 | } else if (rule->action == FR_ACT_GOTO) | |
275 | goto errout_free; | |
276 | ||
14c0b97d TG |
277 | err = ops->configure(rule, skb, nlh, frh, tb); |
278 | if (err < 0) | |
279 | goto errout_free; | |
280 | ||
281 | list_for_each_entry(r, ops->rules_list, list) { | |
282 | if (r->pref > rule->pref) | |
283 | break; | |
284 | last = r; | |
285 | } | |
286 | ||
287 | fib_rule_get(rule); | |
288 | ||
0947c9fe TG |
289 | if (ops->unresolved_rules) { |
290 | /* | |
291 | * There are unresolved goto rules in the list, check if | |
292 | * any of them are pointing to this new rule. | |
293 | */ | |
294 | list_for_each_entry(r, ops->rules_list, list) { | |
295 | if (r->action == FR_ACT_GOTO && | |
296 | r->target == rule->pref) { | |
297 | BUG_ON(r->ctarget != NULL); | |
298 | rcu_assign_pointer(r->ctarget, rule); | |
299 | if (--ops->unresolved_rules == 0) | |
300 | break; | |
301 | } | |
302 | } | |
303 | } | |
304 | ||
305 | if (rule->action == FR_ACT_GOTO) | |
306 | ops->nr_goto_rules++; | |
307 | ||
308 | if (unresolved) | |
309 | ops->unresolved_rules++; | |
310 | ||
14c0b97d TG |
311 | if (last) |
312 | list_add_rcu(&rule->list, &last->list); | |
313 | else | |
314 | list_add_rcu(&rule->list, ops->rules_list); | |
315 | ||
c17084d2 | 316 | notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).pid); |
14c0b97d TG |
317 | rules_ops_put(ops); |
318 | return 0; | |
319 | ||
320 | errout_free: | |
321 | kfree(rule); | |
322 | errout: | |
323 | rules_ops_put(ops); | |
324 | return err; | |
325 | } | |
326 | ||
9d9e6a58 | 327 | static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
14c0b97d TG |
328 | { |
329 | struct fib_rule_hdr *frh = nlmsg_data(nlh); | |
330 | struct fib_rules_ops *ops = NULL; | |
0947c9fe | 331 | struct fib_rule *rule, *tmp; |
14c0b97d TG |
332 | struct nlattr *tb[FRA_MAX+1]; |
333 | int err = -EINVAL; | |
334 | ||
335 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) | |
336 | goto errout; | |
337 | ||
338 | ops = lookup_rules_ops(frh->family); | |
339 | if (ops == NULL) { | |
340 | err = EAFNOSUPPORT; | |
341 | goto errout; | |
342 | } | |
343 | ||
344 | err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy); | |
345 | if (err < 0) | |
346 | goto errout; | |
347 | ||
e1701c68 TG |
348 | err = validate_rulemsg(frh, tb, ops); |
349 | if (err < 0) | |
350 | goto errout; | |
351 | ||
14c0b97d TG |
352 | list_for_each_entry(rule, ops->rules_list, list) { |
353 | if (frh->action && (frh->action != rule->action)) | |
354 | continue; | |
355 | ||
9e762a4a | 356 | if (frh->table && (frh_get_table(frh, tb) != rule->table)) |
14c0b97d TG |
357 | continue; |
358 | ||
359 | if (tb[FRA_PRIORITY] && | |
360 | (rule->pref != nla_get_u32(tb[FRA_PRIORITY]))) | |
361 | continue; | |
362 | ||
363 | if (tb[FRA_IFNAME] && | |
364 | nla_strcmp(tb[FRA_IFNAME], rule->ifname)) | |
365 | continue; | |
366 | ||
b8964ed9 TG |
367 | if (tb[FRA_FWMARK] && |
368 | (rule->mark != nla_get_u32(tb[FRA_FWMARK]))) | |
369 | continue; | |
370 | ||
371 | if (tb[FRA_FWMASK] && | |
372 | (rule->mark_mask != nla_get_u32(tb[FRA_FWMASK]))) | |
373 | continue; | |
374 | ||
14c0b97d TG |
375 | if (!ops->compare(rule, frh, tb)) |
376 | continue; | |
377 | ||
378 | if (rule->flags & FIB_RULE_PERMANENT) { | |
379 | err = -EPERM; | |
380 | goto errout; | |
381 | } | |
382 | ||
383 | list_del_rcu(&rule->list); | |
0947c9fe TG |
384 | |
385 | if (rule->action == FR_ACT_GOTO) | |
386 | ops->nr_goto_rules--; | |
387 | ||
388 | /* | |
389 | * Check if this rule is a target to any of them. If so, | |
390 | * disable them. As this operation is eventually very | |
391 | * expensive, it is only performed if goto rules have | |
392 | * actually been added. | |
393 | */ | |
394 | if (ops->nr_goto_rules > 0) { | |
395 | list_for_each_entry(tmp, ops->rules_list, list) { | |
396 | if (tmp->ctarget == rule) { | |
397 | rcu_assign_pointer(tmp->ctarget, NULL); | |
398 | ops->unresolved_rules++; | |
399 | } | |
400 | } | |
401 | } | |
402 | ||
14c0b97d | 403 | synchronize_rcu(); |
c17084d2 TG |
404 | notify_rule_change(RTM_DELRULE, rule, ops, nlh, |
405 | NETLINK_CB(skb).pid); | |
14c0b97d TG |
406 | fib_rule_put(rule); |
407 | rules_ops_put(ops); | |
408 | return 0; | |
409 | } | |
410 | ||
411 | err = -ENOENT; | |
412 | errout: | |
413 | rules_ops_put(ops); | |
414 | return err; | |
415 | } | |
416 | ||
339bf98f TG |
417 | static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops, |
418 | struct fib_rule *rule) | |
419 | { | |
420 | size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)) | |
421 | + nla_total_size(IFNAMSIZ) /* FRA_IFNAME */ | |
422 | + nla_total_size(4) /* FRA_PRIORITY */ | |
423 | + nla_total_size(4) /* FRA_TABLE */ | |
424 | + nla_total_size(4) /* FRA_FWMARK */ | |
425 | + nla_total_size(4); /* FRA_FWMASK */ | |
426 | ||
427 | if (ops->nlmsg_payload) | |
428 | payload += ops->nlmsg_payload(rule); | |
429 | ||
430 | return payload; | |
431 | } | |
432 | ||
14c0b97d TG |
433 | static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule, |
434 | u32 pid, u32 seq, int type, int flags, | |
435 | struct fib_rules_ops *ops) | |
436 | { | |
437 | struct nlmsghdr *nlh; | |
438 | struct fib_rule_hdr *frh; | |
439 | ||
440 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags); | |
441 | if (nlh == NULL) | |
26932566 | 442 | return -EMSGSIZE; |
14c0b97d TG |
443 | |
444 | frh = nlmsg_data(nlh); | |
445 | frh->table = rule->table; | |
9e762a4a | 446 | NLA_PUT_U32(skb, FRA_TABLE, rule->table); |
14c0b97d TG |
447 | frh->res1 = 0; |
448 | frh->res2 = 0; | |
449 | frh->action = rule->action; | |
450 | frh->flags = rule->flags; | |
451 | ||
0947c9fe TG |
452 | if (rule->action == FR_ACT_GOTO && rule->ctarget == NULL) |
453 | frh->flags |= FIB_RULE_UNRESOLVED; | |
454 | ||
2b443683 | 455 | if (rule->ifname[0]) { |
14c0b97d TG |
456 | NLA_PUT_STRING(skb, FRA_IFNAME, rule->ifname); |
457 | ||
2b443683 TG |
458 | if (rule->ifindex == -1) |
459 | frh->flags |= FIB_RULE_DEV_DETACHED; | |
460 | } | |
461 | ||
14c0b97d TG |
462 | if (rule->pref) |
463 | NLA_PUT_U32(skb, FRA_PRIORITY, rule->pref); | |
464 | ||
b8964ed9 TG |
465 | if (rule->mark) |
466 | NLA_PUT_U32(skb, FRA_FWMARK, rule->mark); | |
467 | ||
468 | if (rule->mark_mask || rule->mark) | |
469 | NLA_PUT_U32(skb, FRA_FWMASK, rule->mark_mask); | |
470 | ||
0947c9fe TG |
471 | if (rule->target) |
472 | NLA_PUT_U32(skb, FRA_GOTO, rule->target); | |
473 | ||
14c0b97d TG |
474 | if (ops->fill(rule, skb, nlh, frh) < 0) |
475 | goto nla_put_failure; | |
476 | ||
477 | return nlmsg_end(skb, nlh); | |
478 | ||
479 | nla_put_failure: | |
26932566 PM |
480 | nlmsg_cancel(skb, nlh); |
481 | return -EMSGSIZE; | |
14c0b97d TG |
482 | } |
483 | ||
c454673d TG |
484 | static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb, |
485 | struct fib_rules_ops *ops) | |
14c0b97d TG |
486 | { |
487 | int idx = 0; | |
488 | struct fib_rule *rule; | |
14c0b97d TG |
489 | |
490 | rcu_read_lock(); | |
ec25615b | 491 | list_for_each_entry_rcu(rule, ops->rules_list, list) { |
c454673d | 492 | if (idx < cb->args[1]) |
14c0b97d TG |
493 | goto skip; |
494 | ||
495 | if (fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).pid, | |
496 | cb->nlh->nlmsg_seq, RTM_NEWRULE, | |
497 | NLM_F_MULTI, ops) < 0) | |
498 | break; | |
499 | skip: | |
500 | idx++; | |
501 | } | |
502 | rcu_read_unlock(); | |
c454673d | 503 | cb->args[1] = idx; |
14c0b97d TG |
504 | rules_ops_put(ops); |
505 | ||
506 | return skb->len; | |
507 | } | |
508 | ||
c454673d TG |
509 | static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb) |
510 | { | |
511 | struct fib_rules_ops *ops; | |
512 | int idx = 0, family; | |
513 | ||
514 | family = rtnl_msg_family(cb->nlh); | |
515 | if (family != AF_UNSPEC) { | |
516 | /* Protocol specific dump request */ | |
517 | ops = lookup_rules_ops(family); | |
518 | if (ops == NULL) | |
519 | return -EAFNOSUPPORT; | |
520 | ||
521 | return dump_rules(skb, cb, ops); | |
522 | } | |
523 | ||
524 | rcu_read_lock(); | |
525 | list_for_each_entry_rcu(ops, &rules_ops, list) { | |
526 | if (idx < cb->args[0] || !try_module_get(ops->owner)) | |
527 | goto skip; | |
528 | ||
529 | if (dump_rules(skb, cb, ops) < 0) | |
530 | break; | |
531 | ||
532 | cb->args[1] = 0; | |
533 | skip: | |
534 | idx++; | |
535 | } | |
536 | rcu_read_unlock(); | |
537 | cb->args[0] = idx; | |
538 | ||
539 | return skb->len; | |
540 | } | |
14c0b97d TG |
541 | |
542 | static void notify_rule_change(int event, struct fib_rule *rule, | |
c17084d2 TG |
543 | struct fib_rules_ops *ops, struct nlmsghdr *nlh, |
544 | u32 pid) | |
14c0b97d | 545 | { |
c17084d2 TG |
546 | struct sk_buff *skb; |
547 | int err = -ENOBUFS; | |
14c0b97d | 548 | |
339bf98f | 549 | skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL); |
14c0b97d | 550 | if (skb == NULL) |
c17084d2 TG |
551 | goto errout; |
552 | ||
553 | err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops); | |
26932566 PM |
554 | if (err < 0) { |
555 | /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */ | |
556 | WARN_ON(err == -EMSGSIZE); | |
557 | kfree_skb(skb); | |
558 | goto errout; | |
559 | } | |
c17084d2 TG |
560 | err = rtnl_notify(skb, pid, ops->nlgroup, nlh, GFP_KERNEL); |
561 | errout: | |
562 | if (err < 0) | |
563 | rtnl_set_sk_err(ops->nlgroup, err); | |
14c0b97d TG |
564 | } |
565 | ||
566 | static void attach_rules(struct list_head *rules, struct net_device *dev) | |
567 | { | |
568 | struct fib_rule *rule; | |
569 | ||
570 | list_for_each_entry(rule, rules, list) { | |
571 | if (rule->ifindex == -1 && | |
572 | strcmp(dev->name, rule->ifname) == 0) | |
573 | rule->ifindex = dev->ifindex; | |
574 | } | |
575 | } | |
576 | ||
577 | static void detach_rules(struct list_head *rules, struct net_device *dev) | |
578 | { | |
579 | struct fib_rule *rule; | |
580 | ||
581 | list_for_each_entry(rule, rules, list) | |
582 | if (rule->ifindex == dev->ifindex) | |
583 | rule->ifindex = -1; | |
584 | } | |
585 | ||
586 | ||
587 | static int fib_rules_event(struct notifier_block *this, unsigned long event, | |
588 | void *ptr) | |
589 | { | |
590 | struct net_device *dev = ptr; | |
591 | struct fib_rules_ops *ops; | |
592 | ||
593 | ASSERT_RTNL(); | |
594 | rcu_read_lock(); | |
595 | ||
596 | switch (event) { | |
597 | case NETDEV_REGISTER: | |
598 | list_for_each_entry(ops, &rules_ops, list) | |
599 | attach_rules(ops->rules_list, dev); | |
600 | break; | |
601 | ||
602 | case NETDEV_UNREGISTER: | |
603 | list_for_each_entry(ops, &rules_ops, list) | |
604 | detach_rules(ops->rules_list, dev); | |
605 | break; | |
606 | } | |
607 | ||
608 | rcu_read_unlock(); | |
609 | ||
610 | return NOTIFY_DONE; | |
611 | } | |
612 | ||
613 | static struct notifier_block fib_rules_notifier = { | |
614 | .notifier_call = fib_rules_event, | |
615 | }; | |
616 | ||
617 | static int __init fib_rules_init(void) | |
618 | { | |
9d9e6a58 TG |
619 | rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL); |
620 | rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL); | |
c454673d | 621 | rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule); |
9d9e6a58 | 622 | |
14c0b97d TG |
623 | return register_netdevice_notifier(&fib_rules_notifier); |
624 | } | |
625 | ||
626 | subsys_initcall(fib_rules_init); |