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Commit | Line | Data |
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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 | } | |
149 | } else | |
150 | err = ops->action(rule, fl, flags, arg); | |
151 | ||
14c0b97d TG |
152 | if (err != -EAGAIN) { |
153 | fib_rule_get(rule); | |
154 | arg->rule = rule; | |
155 | goto out; | |
156 | } | |
157 | } | |
158 | ||
83886b6b | 159 | err = -ESRCH; |
14c0b97d TG |
160 | out: |
161 | rcu_read_unlock(); | |
162 | ||
163 | return err; | |
164 | } | |
165 | ||
166 | EXPORT_SYMBOL_GPL(fib_rules_lookup); | |
167 | ||
e1701c68 TG |
168 | static int validate_rulemsg(struct fib_rule_hdr *frh, struct nlattr **tb, |
169 | struct fib_rules_ops *ops) | |
170 | { | |
171 | int err = -EINVAL; | |
172 | ||
173 | if (frh->src_len) | |
174 | if (tb[FRA_SRC] == NULL || | |
175 | frh->src_len > (ops->addr_size * 8) || | |
176 | nla_len(tb[FRA_SRC]) != ops->addr_size) | |
177 | goto errout; | |
178 | ||
179 | if (frh->dst_len) | |
180 | if (tb[FRA_DST] == NULL || | |
181 | frh->dst_len > (ops->addr_size * 8) || | |
182 | nla_len(tb[FRA_DST]) != ops->addr_size) | |
183 | goto errout; | |
184 | ||
185 | err = 0; | |
186 | errout: | |
187 | return err; | |
188 | } | |
189 | ||
9d9e6a58 | 190 | static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
14c0b97d TG |
191 | { |
192 | struct fib_rule_hdr *frh = nlmsg_data(nlh); | |
193 | struct fib_rules_ops *ops = NULL; | |
194 | struct fib_rule *rule, *r, *last = NULL; | |
195 | struct nlattr *tb[FRA_MAX+1]; | |
0947c9fe | 196 | int err = -EINVAL, unresolved = 0; |
14c0b97d TG |
197 | |
198 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) | |
199 | goto errout; | |
200 | ||
201 | ops = lookup_rules_ops(frh->family); | |
202 | if (ops == NULL) { | |
203 | err = EAFNOSUPPORT; | |
204 | goto errout; | |
205 | } | |
206 | ||
207 | err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy); | |
208 | if (err < 0) | |
209 | goto errout; | |
210 | ||
e1701c68 TG |
211 | err = validate_rulemsg(frh, tb, ops); |
212 | if (err < 0) | |
213 | goto errout; | |
214 | ||
14c0b97d TG |
215 | rule = kzalloc(ops->rule_size, GFP_KERNEL); |
216 | if (rule == NULL) { | |
217 | err = -ENOMEM; | |
218 | goto errout; | |
219 | } | |
220 | ||
221 | if (tb[FRA_PRIORITY]) | |
222 | rule->pref = nla_get_u32(tb[FRA_PRIORITY]); | |
223 | ||
224 | if (tb[FRA_IFNAME]) { | |
225 | struct net_device *dev; | |
226 | ||
227 | rule->ifindex = -1; | |
5176f91e | 228 | nla_strlcpy(rule->ifname, tb[FRA_IFNAME], IFNAMSIZ); |
14c0b97d TG |
229 | dev = __dev_get_by_name(rule->ifname); |
230 | if (dev) | |
231 | rule->ifindex = dev->ifindex; | |
232 | } | |
233 | ||
b8964ed9 TG |
234 | if (tb[FRA_FWMARK]) { |
235 | rule->mark = nla_get_u32(tb[FRA_FWMARK]); | |
236 | if (rule->mark) | |
237 | /* compatibility: if the mark value is non-zero all bits | |
238 | * are compared unless a mask is explicitly specified. | |
239 | */ | |
240 | rule->mark_mask = 0xFFFFFFFF; | |
241 | } | |
242 | ||
243 | if (tb[FRA_FWMASK]) | |
244 | rule->mark_mask = nla_get_u32(tb[FRA_FWMASK]); | |
245 | ||
14c0b97d TG |
246 | rule->action = frh->action; |
247 | rule->flags = frh->flags; | |
9e762a4a | 248 | rule->table = frh_get_table(frh, tb); |
14c0b97d TG |
249 | |
250 | if (!rule->pref && ops->default_pref) | |
251 | rule->pref = ops->default_pref(); | |
252 | ||
0947c9fe TG |
253 | err = -EINVAL; |
254 | if (tb[FRA_GOTO]) { | |
255 | if (rule->action != FR_ACT_GOTO) | |
256 | goto errout_free; | |
257 | ||
258 | rule->target = nla_get_u32(tb[FRA_GOTO]); | |
259 | /* Backward jumps are prohibited to avoid endless loops */ | |
260 | if (rule->target <= rule->pref) | |
261 | goto errout_free; | |
262 | ||
263 | list_for_each_entry(r, ops->rules_list, list) { | |
264 | if (r->pref == rule->target) { | |
265 | rule->ctarget = r; | |
266 | break; | |
267 | } | |
268 | } | |
269 | ||
270 | if (rule->ctarget == NULL) | |
271 | unresolved = 1; | |
272 | } else if (rule->action == FR_ACT_GOTO) | |
273 | goto errout_free; | |
274 | ||
14c0b97d TG |
275 | err = ops->configure(rule, skb, nlh, frh, tb); |
276 | if (err < 0) | |
277 | goto errout_free; | |
278 | ||
279 | list_for_each_entry(r, ops->rules_list, list) { | |
280 | if (r->pref > rule->pref) | |
281 | break; | |
282 | last = r; | |
283 | } | |
284 | ||
285 | fib_rule_get(rule); | |
286 | ||
0947c9fe TG |
287 | if (ops->unresolved_rules) { |
288 | /* | |
289 | * There are unresolved goto rules in the list, check if | |
290 | * any of them are pointing to this new rule. | |
291 | */ | |
292 | list_for_each_entry(r, ops->rules_list, list) { | |
293 | if (r->action == FR_ACT_GOTO && | |
294 | r->target == rule->pref) { | |
295 | BUG_ON(r->ctarget != NULL); | |
296 | rcu_assign_pointer(r->ctarget, rule); | |
297 | if (--ops->unresolved_rules == 0) | |
298 | break; | |
299 | } | |
300 | } | |
301 | } | |
302 | ||
303 | if (rule->action == FR_ACT_GOTO) | |
304 | ops->nr_goto_rules++; | |
305 | ||
306 | if (unresolved) | |
307 | ops->unresolved_rules++; | |
308 | ||
14c0b97d TG |
309 | if (last) |
310 | list_add_rcu(&rule->list, &last->list); | |
311 | else | |
312 | list_add_rcu(&rule->list, ops->rules_list); | |
313 | ||
c17084d2 | 314 | notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).pid); |
14c0b97d TG |
315 | rules_ops_put(ops); |
316 | return 0; | |
317 | ||
318 | errout_free: | |
319 | kfree(rule); | |
320 | errout: | |
321 | rules_ops_put(ops); | |
322 | return err; | |
323 | } | |
324 | ||
9d9e6a58 | 325 | static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
14c0b97d TG |
326 | { |
327 | struct fib_rule_hdr *frh = nlmsg_data(nlh); | |
328 | struct fib_rules_ops *ops = NULL; | |
0947c9fe | 329 | struct fib_rule *rule, *tmp; |
14c0b97d TG |
330 | struct nlattr *tb[FRA_MAX+1]; |
331 | int err = -EINVAL; | |
332 | ||
333 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) | |
334 | goto errout; | |
335 | ||
336 | ops = lookup_rules_ops(frh->family); | |
337 | if (ops == NULL) { | |
338 | err = EAFNOSUPPORT; | |
339 | goto errout; | |
340 | } | |
341 | ||
342 | err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy); | |
343 | if (err < 0) | |
344 | goto errout; | |
345 | ||
e1701c68 TG |
346 | err = validate_rulemsg(frh, tb, ops); |
347 | if (err < 0) | |
348 | goto errout; | |
349 | ||
14c0b97d TG |
350 | list_for_each_entry(rule, ops->rules_list, list) { |
351 | if (frh->action && (frh->action != rule->action)) | |
352 | continue; | |
353 | ||
9e762a4a | 354 | if (frh->table && (frh_get_table(frh, tb) != rule->table)) |
14c0b97d TG |
355 | continue; |
356 | ||
357 | if (tb[FRA_PRIORITY] && | |
358 | (rule->pref != nla_get_u32(tb[FRA_PRIORITY]))) | |
359 | continue; | |
360 | ||
361 | if (tb[FRA_IFNAME] && | |
362 | nla_strcmp(tb[FRA_IFNAME], rule->ifname)) | |
363 | continue; | |
364 | ||
b8964ed9 TG |
365 | if (tb[FRA_FWMARK] && |
366 | (rule->mark != nla_get_u32(tb[FRA_FWMARK]))) | |
367 | continue; | |
368 | ||
369 | if (tb[FRA_FWMASK] && | |
370 | (rule->mark_mask != nla_get_u32(tb[FRA_FWMASK]))) | |
371 | continue; | |
372 | ||
14c0b97d TG |
373 | if (!ops->compare(rule, frh, tb)) |
374 | continue; | |
375 | ||
376 | if (rule->flags & FIB_RULE_PERMANENT) { | |
377 | err = -EPERM; | |
378 | goto errout; | |
379 | } | |
380 | ||
381 | list_del_rcu(&rule->list); | |
0947c9fe TG |
382 | |
383 | if (rule->action == FR_ACT_GOTO) | |
384 | ops->nr_goto_rules--; | |
385 | ||
386 | /* | |
387 | * Check if this rule is a target to any of them. If so, | |
388 | * disable them. As this operation is eventually very | |
389 | * expensive, it is only performed if goto rules have | |
390 | * actually been added. | |
391 | */ | |
392 | if (ops->nr_goto_rules > 0) { | |
393 | list_for_each_entry(tmp, ops->rules_list, list) { | |
394 | if (tmp->ctarget == rule) { | |
395 | rcu_assign_pointer(tmp->ctarget, NULL); | |
396 | ops->unresolved_rules++; | |
397 | } | |
398 | } | |
399 | } | |
400 | ||
14c0b97d | 401 | synchronize_rcu(); |
c17084d2 TG |
402 | notify_rule_change(RTM_DELRULE, rule, ops, nlh, |
403 | NETLINK_CB(skb).pid); | |
14c0b97d TG |
404 | fib_rule_put(rule); |
405 | rules_ops_put(ops); | |
406 | return 0; | |
407 | } | |
408 | ||
409 | err = -ENOENT; | |
410 | errout: | |
411 | rules_ops_put(ops); | |
412 | return err; | |
413 | } | |
414 | ||
339bf98f TG |
415 | static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops, |
416 | struct fib_rule *rule) | |
417 | { | |
418 | size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)) | |
419 | + nla_total_size(IFNAMSIZ) /* FRA_IFNAME */ | |
420 | + nla_total_size(4) /* FRA_PRIORITY */ | |
421 | + nla_total_size(4) /* FRA_TABLE */ | |
422 | + nla_total_size(4) /* FRA_FWMARK */ | |
423 | + nla_total_size(4); /* FRA_FWMASK */ | |
424 | ||
425 | if (ops->nlmsg_payload) | |
426 | payload += ops->nlmsg_payload(rule); | |
427 | ||
428 | return payload; | |
429 | } | |
430 | ||
14c0b97d TG |
431 | static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule, |
432 | u32 pid, u32 seq, int type, int flags, | |
433 | struct fib_rules_ops *ops) | |
434 | { | |
435 | struct nlmsghdr *nlh; | |
436 | struct fib_rule_hdr *frh; | |
437 | ||
438 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags); | |
439 | if (nlh == NULL) | |
26932566 | 440 | return -EMSGSIZE; |
14c0b97d TG |
441 | |
442 | frh = nlmsg_data(nlh); | |
443 | frh->table = rule->table; | |
9e762a4a | 444 | NLA_PUT_U32(skb, FRA_TABLE, rule->table); |
14c0b97d TG |
445 | frh->res1 = 0; |
446 | frh->res2 = 0; | |
447 | frh->action = rule->action; | |
448 | frh->flags = rule->flags; | |
449 | ||
0947c9fe TG |
450 | if (rule->action == FR_ACT_GOTO && rule->ctarget == NULL) |
451 | frh->flags |= FIB_RULE_UNRESOLVED; | |
452 | ||
14c0b97d TG |
453 | if (rule->ifname[0]) |
454 | NLA_PUT_STRING(skb, FRA_IFNAME, rule->ifname); | |
455 | ||
456 | if (rule->pref) | |
457 | NLA_PUT_U32(skb, FRA_PRIORITY, rule->pref); | |
458 | ||
b8964ed9 TG |
459 | if (rule->mark) |
460 | NLA_PUT_U32(skb, FRA_FWMARK, rule->mark); | |
461 | ||
462 | if (rule->mark_mask || rule->mark) | |
463 | NLA_PUT_U32(skb, FRA_FWMASK, rule->mark_mask); | |
464 | ||
0947c9fe TG |
465 | if (rule->target) |
466 | NLA_PUT_U32(skb, FRA_GOTO, rule->target); | |
467 | ||
14c0b97d TG |
468 | if (ops->fill(rule, skb, nlh, frh) < 0) |
469 | goto nla_put_failure; | |
470 | ||
471 | return nlmsg_end(skb, nlh); | |
472 | ||
473 | nla_put_failure: | |
26932566 PM |
474 | nlmsg_cancel(skb, nlh); |
475 | return -EMSGSIZE; | |
14c0b97d TG |
476 | } |
477 | ||
c454673d TG |
478 | static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb, |
479 | struct fib_rules_ops *ops) | |
14c0b97d TG |
480 | { |
481 | int idx = 0; | |
482 | struct fib_rule *rule; | |
14c0b97d TG |
483 | |
484 | rcu_read_lock(); | |
ec25615b | 485 | list_for_each_entry_rcu(rule, ops->rules_list, list) { |
c454673d | 486 | if (idx < cb->args[1]) |
14c0b97d TG |
487 | goto skip; |
488 | ||
489 | if (fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).pid, | |
490 | cb->nlh->nlmsg_seq, RTM_NEWRULE, | |
491 | NLM_F_MULTI, ops) < 0) | |
492 | break; | |
493 | skip: | |
494 | idx++; | |
495 | } | |
496 | rcu_read_unlock(); | |
c454673d | 497 | cb->args[1] = idx; |
14c0b97d TG |
498 | rules_ops_put(ops); |
499 | ||
500 | return skb->len; | |
501 | } | |
502 | ||
c454673d TG |
503 | static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb) |
504 | { | |
505 | struct fib_rules_ops *ops; | |
506 | int idx = 0, family; | |
507 | ||
508 | family = rtnl_msg_family(cb->nlh); | |
509 | if (family != AF_UNSPEC) { | |
510 | /* Protocol specific dump request */ | |
511 | ops = lookup_rules_ops(family); | |
512 | if (ops == NULL) | |
513 | return -EAFNOSUPPORT; | |
514 | ||
515 | return dump_rules(skb, cb, ops); | |
516 | } | |
517 | ||
518 | rcu_read_lock(); | |
519 | list_for_each_entry_rcu(ops, &rules_ops, list) { | |
520 | if (idx < cb->args[0] || !try_module_get(ops->owner)) | |
521 | goto skip; | |
522 | ||
523 | if (dump_rules(skb, cb, ops) < 0) | |
524 | break; | |
525 | ||
526 | cb->args[1] = 0; | |
527 | skip: | |
528 | idx++; | |
529 | } | |
530 | rcu_read_unlock(); | |
531 | cb->args[0] = idx; | |
532 | ||
533 | return skb->len; | |
534 | } | |
14c0b97d TG |
535 | |
536 | static void notify_rule_change(int event, struct fib_rule *rule, | |
c17084d2 TG |
537 | struct fib_rules_ops *ops, struct nlmsghdr *nlh, |
538 | u32 pid) | |
14c0b97d | 539 | { |
c17084d2 TG |
540 | struct sk_buff *skb; |
541 | int err = -ENOBUFS; | |
14c0b97d | 542 | |
339bf98f | 543 | skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL); |
14c0b97d | 544 | if (skb == NULL) |
c17084d2 TG |
545 | goto errout; |
546 | ||
547 | err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops); | |
26932566 PM |
548 | if (err < 0) { |
549 | /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */ | |
550 | WARN_ON(err == -EMSGSIZE); | |
551 | kfree_skb(skb); | |
552 | goto errout; | |
553 | } | |
c17084d2 TG |
554 | err = rtnl_notify(skb, pid, ops->nlgroup, nlh, GFP_KERNEL); |
555 | errout: | |
556 | if (err < 0) | |
557 | rtnl_set_sk_err(ops->nlgroup, err); | |
14c0b97d TG |
558 | } |
559 | ||
560 | static void attach_rules(struct list_head *rules, struct net_device *dev) | |
561 | { | |
562 | struct fib_rule *rule; | |
563 | ||
564 | list_for_each_entry(rule, rules, list) { | |
565 | if (rule->ifindex == -1 && | |
566 | strcmp(dev->name, rule->ifname) == 0) | |
567 | rule->ifindex = dev->ifindex; | |
568 | } | |
569 | } | |
570 | ||
571 | static void detach_rules(struct list_head *rules, struct net_device *dev) | |
572 | { | |
573 | struct fib_rule *rule; | |
574 | ||
575 | list_for_each_entry(rule, rules, list) | |
576 | if (rule->ifindex == dev->ifindex) | |
577 | rule->ifindex = -1; | |
578 | } | |
579 | ||
580 | ||
581 | static int fib_rules_event(struct notifier_block *this, unsigned long event, | |
582 | void *ptr) | |
583 | { | |
584 | struct net_device *dev = ptr; | |
585 | struct fib_rules_ops *ops; | |
586 | ||
587 | ASSERT_RTNL(); | |
588 | rcu_read_lock(); | |
589 | ||
590 | switch (event) { | |
591 | case NETDEV_REGISTER: | |
592 | list_for_each_entry(ops, &rules_ops, list) | |
593 | attach_rules(ops->rules_list, dev); | |
594 | break; | |
595 | ||
596 | case NETDEV_UNREGISTER: | |
597 | list_for_each_entry(ops, &rules_ops, list) | |
598 | detach_rules(ops->rules_list, dev); | |
599 | break; | |
600 | } | |
601 | ||
602 | rcu_read_unlock(); | |
603 | ||
604 | return NOTIFY_DONE; | |
605 | } | |
606 | ||
607 | static struct notifier_block fib_rules_notifier = { | |
608 | .notifier_call = fib_rules_event, | |
609 | }; | |
610 | ||
611 | static int __init fib_rules_init(void) | |
612 | { | |
9d9e6a58 TG |
613 | rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL); |
614 | rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL); | |
c454673d | 615 | rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule); |
9d9e6a58 | 616 | |
14c0b97d TG |
617 | return register_netdevice_notifier(&fib_rules_notifier); |
618 | } | |
619 | ||
620 | subsys_initcall(fib_rules_init); |