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> | |
e9dc8653 | 14 | #include <net/net_namespace.h> |
881d966b | 15 | #include <net/sock.h> |
14c0b97d TG |
16 | #include <net/fib_rules.h> |
17 | ||
2994c638 DL |
18 | int fib_default_rule_add(struct fib_rules_ops *ops, |
19 | u32 pref, u32 table, u32 flags) | |
20 | { | |
21 | struct fib_rule *r; | |
22 | ||
23 | r = kzalloc(ops->rule_size, GFP_KERNEL); | |
24 | if (r == NULL) | |
25 | return -ENOMEM; | |
26 | ||
27 | atomic_set(&r->refcnt, 1); | |
28 | r->action = FR_ACT_TO_TBL; | |
29 | r->pref = pref; | |
30 | r->table = table; | |
31 | r->flags = flags; | |
3661a910 | 32 | r->fr_net = hold_net(ops->fro_net); |
2994c638 DL |
33 | |
34 | /* The lock is not required here, the list in unreacheable | |
35 | * at the moment this function is called */ | |
36 | list_add_tail(&r->list, &ops->rules_list); | |
37 | return 0; | |
38 | } | |
39 | EXPORT_SYMBOL(fib_default_rule_add); | |
40 | ||
9e3a5487 | 41 | static void notify_rule_change(int event, struct fib_rule *rule, |
c17084d2 TG |
42 | struct fib_rules_ops *ops, struct nlmsghdr *nlh, |
43 | u32 pid); | |
14c0b97d | 44 | |
5fd30ee7 | 45 | static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family) |
14c0b97d TG |
46 | { |
47 | struct fib_rules_ops *ops; | |
48 | ||
49 | rcu_read_lock(); | |
5fd30ee7 | 50 | list_for_each_entry_rcu(ops, &net->rules_ops, list) { |
14c0b97d TG |
51 | if (ops->family == family) { |
52 | if (!try_module_get(ops->owner)) | |
53 | ops = NULL; | |
54 | rcu_read_unlock(); | |
55 | return ops; | |
56 | } | |
57 | } | |
58 | rcu_read_unlock(); | |
59 | ||
60 | return NULL; | |
61 | } | |
62 | ||
63 | static void rules_ops_put(struct fib_rules_ops *ops) | |
64 | { | |
65 | if (ops) | |
66 | module_put(ops->owner); | |
67 | } | |
68 | ||
73417f61 TG |
69 | static void flush_route_cache(struct fib_rules_ops *ops) |
70 | { | |
71 | if (ops->flush_cache) | |
ae299fc0 | 72 | ops->flush_cache(ops); |
73417f61 TG |
73 | } |
74 | ||
e9c5158a | 75 | static int __fib_rules_register(struct fib_rules_ops *ops) |
14c0b97d TG |
76 | { |
77 | int err = -EEXIST; | |
78 | struct fib_rules_ops *o; | |
9e3a5487 DL |
79 | struct net *net; |
80 | ||
81 | net = ops->fro_net; | |
14c0b97d TG |
82 | |
83 | if (ops->rule_size < sizeof(struct fib_rule)) | |
84 | return -EINVAL; | |
85 | ||
86 | if (ops->match == NULL || ops->configure == NULL || | |
87 | ops->compare == NULL || ops->fill == NULL || | |
88 | ops->action == NULL) | |
89 | return -EINVAL; | |
90 | ||
5fd30ee7 DL |
91 | spin_lock(&net->rules_mod_lock); |
92 | list_for_each_entry(o, &net->rules_ops, list) | |
14c0b97d TG |
93 | if (ops->family == o->family) |
94 | goto errout; | |
95 | ||
5fd30ee7 DL |
96 | hold_net(net); |
97 | list_add_tail_rcu(&ops->list, &net->rules_ops); | |
14c0b97d TG |
98 | err = 0; |
99 | errout: | |
5fd30ee7 | 100 | spin_unlock(&net->rules_mod_lock); |
14c0b97d TG |
101 | |
102 | return err; | |
103 | } | |
104 | ||
e9c5158a EB |
105 | struct fib_rules_ops * |
106 | fib_rules_register(struct fib_rules_ops *tmpl, struct net *net) | |
107 | { | |
108 | struct fib_rules_ops *ops; | |
109 | int err; | |
110 | ||
111 | ops = kmemdup(tmpl, sizeof (*ops), GFP_KERNEL); | |
112 | if (ops == NULL) | |
113 | return ERR_PTR(-ENOMEM); | |
114 | ||
115 | INIT_LIST_HEAD(&ops->rules_list); | |
116 | ops->fro_net = net; | |
117 | ||
118 | err = __fib_rules_register(ops); | |
119 | if (err) { | |
120 | kfree(ops); | |
121 | ops = ERR_PTR(err); | |
122 | } | |
123 | ||
124 | return ops; | |
125 | } | |
126 | ||
14c0b97d TG |
127 | EXPORT_SYMBOL_GPL(fib_rules_register); |
128 | ||
9eb87f3f | 129 | void fib_rules_cleanup_ops(struct fib_rules_ops *ops) |
14c0b97d TG |
130 | { |
131 | struct fib_rule *rule, *tmp; | |
132 | ||
76c72d4f | 133 | list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) { |
14c0b97d TG |
134 | list_del_rcu(&rule->list); |
135 | fib_rule_put(rule); | |
136 | } | |
137 | } | |
9eb87f3f | 138 | EXPORT_SYMBOL_GPL(fib_rules_cleanup_ops); |
14c0b97d | 139 | |
e9c5158a EB |
140 | static void fib_rules_put_rcu(struct rcu_head *head) |
141 | { | |
142 | struct fib_rules_ops *ops = container_of(head, struct fib_rules_ops, rcu); | |
143 | struct net *net = ops->fro_net; | |
144 | ||
145 | release_net(net); | |
146 | kfree(ops); | |
147 | } | |
148 | ||
9e3a5487 | 149 | void fib_rules_unregister(struct fib_rules_ops *ops) |
14c0b97d | 150 | { |
9e3a5487 | 151 | struct net *net = ops->fro_net; |
14c0b97d | 152 | |
5fd30ee7 | 153 | spin_lock(&net->rules_mod_lock); |
72132c1b DL |
154 | list_del_rcu(&ops->list); |
155 | fib_rules_cleanup_ops(ops); | |
5fd30ee7 | 156 | spin_unlock(&net->rules_mod_lock); |
14c0b97d | 157 | |
e9c5158a | 158 | call_rcu(&ops->rcu, fib_rules_put_rcu); |
14c0b97d TG |
159 | } |
160 | ||
161 | EXPORT_SYMBOL_GPL(fib_rules_unregister); | |
162 | ||
3dfbcc41 TG |
163 | static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops, |
164 | struct flowi *fl, int flags) | |
165 | { | |
166 | int ret = 0; | |
167 | ||
491deb24 | 168 | if (rule->iifindex && (rule->iifindex != fl->iif)) |
3dfbcc41 TG |
169 | goto out; |
170 | ||
1b038a5e PM |
171 | if (rule->oifindex && (rule->oifindex != fl->oif)) |
172 | goto out; | |
173 | ||
3dfbcc41 TG |
174 | if ((rule->mark ^ fl->mark) & rule->mark_mask) |
175 | goto out; | |
176 | ||
177 | ret = ops->match(rule, fl, flags); | |
178 | out: | |
179 | return (rule->flags & FIB_RULE_INVERT) ? !ret : ret; | |
180 | } | |
181 | ||
14c0b97d TG |
182 | int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl, |
183 | int flags, struct fib_lookup_arg *arg) | |
184 | { | |
185 | struct fib_rule *rule; | |
186 | int err; | |
187 | ||
188 | rcu_read_lock(); | |
189 | ||
76c72d4f | 190 | list_for_each_entry_rcu(rule, &ops->rules_list, list) { |
0947c9fe | 191 | jumped: |
3dfbcc41 | 192 | if (!fib_rule_match(rule, ops, fl, flags)) |
14c0b97d TG |
193 | continue; |
194 | ||
0947c9fe TG |
195 | if (rule->action == FR_ACT_GOTO) { |
196 | struct fib_rule *target; | |
197 | ||
198 | target = rcu_dereference(rule->ctarget); | |
199 | if (target == NULL) { | |
200 | continue; | |
201 | } else { | |
202 | rule = target; | |
203 | goto jumped; | |
204 | } | |
fa0b2d1d TG |
205 | } else if (rule->action == FR_ACT_NOP) |
206 | continue; | |
207 | else | |
0947c9fe TG |
208 | err = ops->action(rule, fl, flags, arg); |
209 | ||
14c0b97d TG |
210 | if (err != -EAGAIN) { |
211 | fib_rule_get(rule); | |
212 | arg->rule = rule; | |
213 | goto out; | |
214 | } | |
215 | } | |
216 | ||
83886b6b | 217 | err = -ESRCH; |
14c0b97d TG |
218 | out: |
219 | rcu_read_unlock(); | |
220 | ||
221 | return err; | |
222 | } | |
223 | ||
224 | EXPORT_SYMBOL_GPL(fib_rules_lookup); | |
225 | ||
e1701c68 TG |
226 | static int validate_rulemsg(struct fib_rule_hdr *frh, struct nlattr **tb, |
227 | struct fib_rules_ops *ops) | |
228 | { | |
229 | int err = -EINVAL; | |
230 | ||
231 | if (frh->src_len) | |
232 | if (tb[FRA_SRC] == NULL || | |
233 | frh->src_len > (ops->addr_size * 8) || | |
234 | nla_len(tb[FRA_SRC]) != ops->addr_size) | |
235 | goto errout; | |
236 | ||
237 | if (frh->dst_len) | |
238 | if (tb[FRA_DST] == NULL || | |
239 | frh->dst_len > (ops->addr_size * 8) || | |
240 | nla_len(tb[FRA_DST]) != ops->addr_size) | |
241 | goto errout; | |
242 | ||
243 | err = 0; | |
244 | errout: | |
245 | return err; | |
246 | } | |
247 | ||
9d9e6a58 | 248 | static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
14c0b97d | 249 | { |
3b1e0a65 | 250 | struct net *net = sock_net(skb->sk); |
14c0b97d TG |
251 | struct fib_rule_hdr *frh = nlmsg_data(nlh); |
252 | struct fib_rules_ops *ops = NULL; | |
253 | struct fib_rule *rule, *r, *last = NULL; | |
254 | struct nlattr *tb[FRA_MAX+1]; | |
0947c9fe | 255 | int err = -EINVAL, unresolved = 0; |
14c0b97d TG |
256 | |
257 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) | |
258 | goto errout; | |
259 | ||
5fd30ee7 | 260 | ops = lookup_rules_ops(net, frh->family); |
14c0b97d | 261 | if (ops == NULL) { |
2fe195cf | 262 | err = -EAFNOSUPPORT; |
14c0b97d TG |
263 | goto errout; |
264 | } | |
265 | ||
266 | err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy); | |
267 | if (err < 0) | |
268 | goto errout; | |
269 | ||
e1701c68 TG |
270 | err = validate_rulemsg(frh, tb, ops); |
271 | if (err < 0) | |
272 | goto errout; | |
273 | ||
14c0b97d TG |
274 | rule = kzalloc(ops->rule_size, GFP_KERNEL); |
275 | if (rule == NULL) { | |
276 | err = -ENOMEM; | |
277 | goto errout; | |
278 | } | |
3661a910 | 279 | rule->fr_net = hold_net(net); |
14c0b97d TG |
280 | |
281 | if (tb[FRA_PRIORITY]) | |
282 | rule->pref = nla_get_u32(tb[FRA_PRIORITY]); | |
283 | ||
491deb24 | 284 | if (tb[FRA_IIFNAME]) { |
14c0b97d TG |
285 | struct net_device *dev; |
286 | ||
491deb24 PM |
287 | rule->iifindex = -1; |
288 | nla_strlcpy(rule->iifname, tb[FRA_IIFNAME], IFNAMSIZ); | |
289 | dev = __dev_get_by_name(net, rule->iifname); | |
14c0b97d | 290 | if (dev) |
491deb24 | 291 | rule->iifindex = dev->ifindex; |
14c0b97d TG |
292 | } |
293 | ||
1b038a5e PM |
294 | if (tb[FRA_OIFNAME]) { |
295 | struct net_device *dev; | |
296 | ||
297 | rule->oifindex = -1; | |
298 | nla_strlcpy(rule->oifname, tb[FRA_OIFNAME], IFNAMSIZ); | |
299 | dev = __dev_get_by_name(net, rule->oifname); | |
300 | if (dev) | |
301 | rule->oifindex = dev->ifindex; | |
302 | } | |
303 | ||
b8964ed9 TG |
304 | if (tb[FRA_FWMARK]) { |
305 | rule->mark = nla_get_u32(tb[FRA_FWMARK]); | |
306 | if (rule->mark) | |
307 | /* compatibility: if the mark value is non-zero all bits | |
308 | * are compared unless a mask is explicitly specified. | |
309 | */ | |
310 | rule->mark_mask = 0xFFFFFFFF; | |
311 | } | |
312 | ||
313 | if (tb[FRA_FWMASK]) | |
314 | rule->mark_mask = nla_get_u32(tb[FRA_FWMASK]); | |
315 | ||
14c0b97d TG |
316 | rule->action = frh->action; |
317 | rule->flags = frh->flags; | |
9e762a4a | 318 | rule->table = frh_get_table(frh, tb); |
14c0b97d | 319 | |
5adef180 | 320 | if (!tb[FRA_PRIORITY] && ops->default_pref) |
868d13ac | 321 | rule->pref = ops->default_pref(ops); |
14c0b97d | 322 | |
0947c9fe TG |
323 | err = -EINVAL; |
324 | if (tb[FRA_GOTO]) { | |
325 | if (rule->action != FR_ACT_GOTO) | |
326 | goto errout_free; | |
327 | ||
328 | rule->target = nla_get_u32(tb[FRA_GOTO]); | |
329 | /* Backward jumps are prohibited to avoid endless loops */ | |
330 | if (rule->target <= rule->pref) | |
331 | goto errout_free; | |
332 | ||
76c72d4f | 333 | list_for_each_entry(r, &ops->rules_list, list) { |
0947c9fe TG |
334 | if (r->pref == rule->target) { |
335 | rule->ctarget = r; | |
336 | break; | |
337 | } | |
338 | } | |
339 | ||
340 | if (rule->ctarget == NULL) | |
341 | unresolved = 1; | |
342 | } else if (rule->action == FR_ACT_GOTO) | |
343 | goto errout_free; | |
344 | ||
8b3521ee | 345 | err = ops->configure(rule, skb, frh, tb); |
14c0b97d TG |
346 | if (err < 0) |
347 | goto errout_free; | |
348 | ||
76c72d4f | 349 | list_for_each_entry(r, &ops->rules_list, list) { |
14c0b97d TG |
350 | if (r->pref > rule->pref) |
351 | break; | |
352 | last = r; | |
353 | } | |
354 | ||
355 | fib_rule_get(rule); | |
356 | ||
0947c9fe TG |
357 | if (ops->unresolved_rules) { |
358 | /* | |
359 | * There are unresolved goto rules in the list, check if | |
360 | * any of them are pointing to this new rule. | |
361 | */ | |
76c72d4f | 362 | list_for_each_entry(r, &ops->rules_list, list) { |
0947c9fe TG |
363 | if (r->action == FR_ACT_GOTO && |
364 | r->target == rule->pref) { | |
365 | BUG_ON(r->ctarget != NULL); | |
366 | rcu_assign_pointer(r->ctarget, rule); | |
367 | if (--ops->unresolved_rules == 0) | |
368 | break; | |
369 | } | |
370 | } | |
371 | } | |
372 | ||
373 | if (rule->action == FR_ACT_GOTO) | |
374 | ops->nr_goto_rules++; | |
375 | ||
376 | if (unresolved) | |
377 | ops->unresolved_rules++; | |
378 | ||
14c0b97d TG |
379 | if (last) |
380 | list_add_rcu(&rule->list, &last->list); | |
381 | else | |
76c72d4f | 382 | list_add_rcu(&rule->list, &ops->rules_list); |
14c0b97d | 383 | |
9e3a5487 | 384 | notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).pid); |
73417f61 | 385 | flush_route_cache(ops); |
14c0b97d TG |
386 | rules_ops_put(ops); |
387 | return 0; | |
388 | ||
389 | errout_free: | |
3661a910 | 390 | release_net(rule->fr_net); |
14c0b97d TG |
391 | kfree(rule); |
392 | errout: | |
393 | rules_ops_put(ops); | |
394 | return err; | |
395 | } | |
396 | ||
9d9e6a58 | 397 | static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
14c0b97d | 398 | { |
3b1e0a65 | 399 | struct net *net = sock_net(skb->sk); |
14c0b97d TG |
400 | struct fib_rule_hdr *frh = nlmsg_data(nlh); |
401 | struct fib_rules_ops *ops = NULL; | |
0947c9fe | 402 | struct fib_rule *rule, *tmp; |
14c0b97d TG |
403 | struct nlattr *tb[FRA_MAX+1]; |
404 | int err = -EINVAL; | |
405 | ||
406 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) | |
407 | goto errout; | |
408 | ||
5fd30ee7 | 409 | ops = lookup_rules_ops(net, frh->family); |
14c0b97d | 410 | if (ops == NULL) { |
2fe195cf | 411 | err = -EAFNOSUPPORT; |
14c0b97d TG |
412 | goto errout; |
413 | } | |
414 | ||
415 | err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy); | |
416 | if (err < 0) | |
417 | goto errout; | |
418 | ||
e1701c68 TG |
419 | err = validate_rulemsg(frh, tb, ops); |
420 | if (err < 0) | |
421 | goto errout; | |
422 | ||
76c72d4f | 423 | list_for_each_entry(rule, &ops->rules_list, list) { |
14c0b97d TG |
424 | if (frh->action && (frh->action != rule->action)) |
425 | continue; | |
426 | ||
9e762a4a | 427 | if (frh->table && (frh_get_table(frh, tb) != rule->table)) |
14c0b97d TG |
428 | continue; |
429 | ||
430 | if (tb[FRA_PRIORITY] && | |
431 | (rule->pref != nla_get_u32(tb[FRA_PRIORITY]))) | |
432 | continue; | |
433 | ||
491deb24 PM |
434 | if (tb[FRA_IIFNAME] && |
435 | nla_strcmp(tb[FRA_IIFNAME], rule->iifname)) | |
14c0b97d TG |
436 | continue; |
437 | ||
1b038a5e PM |
438 | if (tb[FRA_OIFNAME] && |
439 | nla_strcmp(tb[FRA_OIFNAME], rule->oifname)) | |
440 | continue; | |
441 | ||
b8964ed9 TG |
442 | if (tb[FRA_FWMARK] && |
443 | (rule->mark != nla_get_u32(tb[FRA_FWMARK]))) | |
444 | continue; | |
445 | ||
446 | if (tb[FRA_FWMASK] && | |
447 | (rule->mark_mask != nla_get_u32(tb[FRA_FWMASK]))) | |
448 | continue; | |
449 | ||
14c0b97d TG |
450 | if (!ops->compare(rule, frh, tb)) |
451 | continue; | |
452 | ||
453 | if (rule->flags & FIB_RULE_PERMANENT) { | |
454 | err = -EPERM; | |
455 | goto errout; | |
456 | } | |
457 | ||
458 | list_del_rcu(&rule->list); | |
0947c9fe TG |
459 | |
460 | if (rule->action == FR_ACT_GOTO) | |
461 | ops->nr_goto_rules--; | |
462 | ||
463 | /* | |
464 | * Check if this rule is a target to any of them. If so, | |
465 | * disable them. As this operation is eventually very | |
466 | * expensive, it is only performed if goto rules have | |
467 | * actually been added. | |
468 | */ | |
469 | if (ops->nr_goto_rules > 0) { | |
76c72d4f | 470 | list_for_each_entry(tmp, &ops->rules_list, list) { |
0947c9fe TG |
471 | if (tmp->ctarget == rule) { |
472 | rcu_assign_pointer(tmp->ctarget, NULL); | |
473 | ops->unresolved_rules++; | |
474 | } | |
475 | } | |
476 | } | |
477 | ||
14c0b97d | 478 | synchronize_rcu(); |
9e3a5487 | 479 | notify_rule_change(RTM_DELRULE, rule, ops, nlh, |
c17084d2 | 480 | NETLINK_CB(skb).pid); |
14c0b97d | 481 | fib_rule_put(rule); |
73417f61 | 482 | flush_route_cache(ops); |
14c0b97d TG |
483 | rules_ops_put(ops); |
484 | return 0; | |
485 | } | |
486 | ||
487 | err = -ENOENT; | |
488 | errout: | |
489 | rules_ops_put(ops); | |
490 | return err; | |
491 | } | |
492 | ||
339bf98f TG |
493 | static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops, |
494 | struct fib_rule *rule) | |
495 | { | |
496 | size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)) | |
491deb24 | 497 | + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */ |
1b038a5e | 498 | + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */ |
339bf98f TG |
499 | + nla_total_size(4) /* FRA_PRIORITY */ |
500 | + nla_total_size(4) /* FRA_TABLE */ | |
501 | + nla_total_size(4) /* FRA_FWMARK */ | |
502 | + nla_total_size(4); /* FRA_FWMASK */ | |
503 | ||
504 | if (ops->nlmsg_payload) | |
505 | payload += ops->nlmsg_payload(rule); | |
506 | ||
507 | return payload; | |
508 | } | |
509 | ||
14c0b97d TG |
510 | static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule, |
511 | u32 pid, u32 seq, int type, int flags, | |
512 | struct fib_rules_ops *ops) | |
513 | { | |
514 | struct nlmsghdr *nlh; | |
515 | struct fib_rule_hdr *frh; | |
516 | ||
517 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags); | |
518 | if (nlh == NULL) | |
26932566 | 519 | return -EMSGSIZE; |
14c0b97d TG |
520 | |
521 | frh = nlmsg_data(nlh); | |
522 | frh->table = rule->table; | |
9e762a4a | 523 | NLA_PUT_U32(skb, FRA_TABLE, rule->table); |
14c0b97d TG |
524 | frh->res1 = 0; |
525 | frh->res2 = 0; | |
526 | frh->action = rule->action; | |
527 | frh->flags = rule->flags; | |
528 | ||
0947c9fe TG |
529 | if (rule->action == FR_ACT_GOTO && rule->ctarget == NULL) |
530 | frh->flags |= FIB_RULE_UNRESOLVED; | |
531 | ||
491deb24 PM |
532 | if (rule->iifname[0]) { |
533 | NLA_PUT_STRING(skb, FRA_IIFNAME, rule->iifname); | |
14c0b97d | 534 | |
491deb24 PM |
535 | if (rule->iifindex == -1) |
536 | frh->flags |= FIB_RULE_IIF_DETACHED; | |
2b443683 TG |
537 | } |
538 | ||
1b038a5e PM |
539 | if (rule->oifname[0]) { |
540 | NLA_PUT_STRING(skb, FRA_OIFNAME, rule->oifname); | |
541 | ||
542 | if (rule->oifindex == -1) | |
543 | frh->flags |= FIB_RULE_OIF_DETACHED; | |
544 | } | |
545 | ||
14c0b97d TG |
546 | if (rule->pref) |
547 | NLA_PUT_U32(skb, FRA_PRIORITY, rule->pref); | |
548 | ||
b8964ed9 TG |
549 | if (rule->mark) |
550 | NLA_PUT_U32(skb, FRA_FWMARK, rule->mark); | |
551 | ||
552 | if (rule->mark_mask || rule->mark) | |
553 | NLA_PUT_U32(skb, FRA_FWMASK, rule->mark_mask); | |
554 | ||
0947c9fe TG |
555 | if (rule->target) |
556 | NLA_PUT_U32(skb, FRA_GOTO, rule->target); | |
557 | ||
04af8cf6 | 558 | if (ops->fill(rule, skb, frh) < 0) |
14c0b97d TG |
559 | goto nla_put_failure; |
560 | ||
561 | return nlmsg_end(skb, nlh); | |
562 | ||
563 | nla_put_failure: | |
26932566 PM |
564 | nlmsg_cancel(skb, nlh); |
565 | return -EMSGSIZE; | |
14c0b97d TG |
566 | } |
567 | ||
c454673d TG |
568 | static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb, |
569 | struct fib_rules_ops *ops) | |
14c0b97d TG |
570 | { |
571 | int idx = 0; | |
572 | struct fib_rule *rule; | |
14c0b97d | 573 | |
76c72d4f | 574 | list_for_each_entry(rule, &ops->rules_list, list) { |
c454673d | 575 | if (idx < cb->args[1]) |
14c0b97d TG |
576 | goto skip; |
577 | ||
578 | if (fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).pid, | |
579 | cb->nlh->nlmsg_seq, RTM_NEWRULE, | |
580 | NLM_F_MULTI, ops) < 0) | |
581 | break; | |
582 | skip: | |
583 | idx++; | |
584 | } | |
c454673d | 585 | cb->args[1] = idx; |
14c0b97d TG |
586 | rules_ops_put(ops); |
587 | ||
588 | return skb->len; | |
589 | } | |
590 | ||
c454673d TG |
591 | static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb) |
592 | { | |
3b1e0a65 | 593 | struct net *net = sock_net(skb->sk); |
c454673d TG |
594 | struct fib_rules_ops *ops; |
595 | int idx = 0, family; | |
596 | ||
597 | family = rtnl_msg_family(cb->nlh); | |
598 | if (family != AF_UNSPEC) { | |
599 | /* Protocol specific dump request */ | |
5fd30ee7 | 600 | ops = lookup_rules_ops(net, family); |
c454673d TG |
601 | if (ops == NULL) |
602 | return -EAFNOSUPPORT; | |
603 | ||
604 | return dump_rules(skb, cb, ops); | |
605 | } | |
606 | ||
607 | rcu_read_lock(); | |
5fd30ee7 | 608 | list_for_each_entry_rcu(ops, &net->rules_ops, list) { |
c454673d TG |
609 | if (idx < cb->args[0] || !try_module_get(ops->owner)) |
610 | goto skip; | |
611 | ||
612 | if (dump_rules(skb, cb, ops) < 0) | |
613 | break; | |
614 | ||
615 | cb->args[1] = 0; | |
616 | skip: | |
617 | idx++; | |
618 | } | |
619 | rcu_read_unlock(); | |
620 | cb->args[0] = idx; | |
621 | ||
622 | return skb->len; | |
623 | } | |
14c0b97d | 624 | |
9e3a5487 | 625 | static void notify_rule_change(int event, struct fib_rule *rule, |
c17084d2 TG |
626 | struct fib_rules_ops *ops, struct nlmsghdr *nlh, |
627 | u32 pid) | |
14c0b97d | 628 | { |
9e3a5487 | 629 | struct net *net; |
c17084d2 TG |
630 | struct sk_buff *skb; |
631 | int err = -ENOBUFS; | |
14c0b97d | 632 | |
9e3a5487 | 633 | net = ops->fro_net; |
339bf98f | 634 | skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL); |
14c0b97d | 635 | if (skb == NULL) |
c17084d2 TG |
636 | goto errout; |
637 | ||
638 | err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops); | |
26932566 PM |
639 | if (err < 0) { |
640 | /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */ | |
641 | WARN_ON(err == -EMSGSIZE); | |
642 | kfree_skb(skb); | |
643 | goto errout; | |
644 | } | |
9e3a5487 | 645 | |
1ce85fe4 PNA |
646 | rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL); |
647 | return; | |
c17084d2 TG |
648 | errout: |
649 | if (err < 0) | |
5fd30ee7 | 650 | rtnl_set_sk_err(net, ops->nlgroup, err); |
14c0b97d TG |
651 | } |
652 | ||
653 | static void attach_rules(struct list_head *rules, struct net_device *dev) | |
654 | { | |
655 | struct fib_rule *rule; | |
656 | ||
657 | list_for_each_entry(rule, rules, list) { | |
491deb24 PM |
658 | if (rule->iifindex == -1 && |
659 | strcmp(dev->name, rule->iifname) == 0) | |
660 | rule->iifindex = dev->ifindex; | |
1b038a5e PM |
661 | if (rule->oifindex == -1 && |
662 | strcmp(dev->name, rule->oifname) == 0) | |
663 | rule->oifindex = dev->ifindex; | |
14c0b97d TG |
664 | } |
665 | } | |
666 | ||
667 | static void detach_rules(struct list_head *rules, struct net_device *dev) | |
668 | { | |
669 | struct fib_rule *rule; | |
670 | ||
1b038a5e | 671 | list_for_each_entry(rule, rules, list) { |
491deb24 PM |
672 | if (rule->iifindex == dev->ifindex) |
673 | rule->iifindex = -1; | |
1b038a5e PM |
674 | if (rule->oifindex == dev->ifindex) |
675 | rule->oifindex = -1; | |
676 | } | |
14c0b97d TG |
677 | } |
678 | ||
679 | ||
680 | static int fib_rules_event(struct notifier_block *this, unsigned long event, | |
681 | void *ptr) | |
682 | { | |
683 | struct net_device *dev = ptr; | |
c346dca1 | 684 | struct net *net = dev_net(dev); |
14c0b97d TG |
685 | struct fib_rules_ops *ops; |
686 | ||
687 | ASSERT_RTNL(); | |
688 | rcu_read_lock(); | |
689 | ||
690 | switch (event) { | |
691 | case NETDEV_REGISTER: | |
5fd30ee7 | 692 | list_for_each_entry(ops, &net->rules_ops, list) |
76c72d4f | 693 | attach_rules(&ops->rules_list, dev); |
14c0b97d TG |
694 | break; |
695 | ||
696 | case NETDEV_UNREGISTER: | |
5fd30ee7 | 697 | list_for_each_entry(ops, &net->rules_ops, list) |
76c72d4f | 698 | detach_rules(&ops->rules_list, dev); |
14c0b97d TG |
699 | break; |
700 | } | |
701 | ||
702 | rcu_read_unlock(); | |
703 | ||
704 | return NOTIFY_DONE; | |
705 | } | |
706 | ||
707 | static struct notifier_block fib_rules_notifier = { | |
708 | .notifier_call = fib_rules_event, | |
709 | }; | |
710 | ||
2c8c1e72 | 711 | static int __net_init fib_rules_net_init(struct net *net) |
5fd30ee7 DL |
712 | { |
713 | INIT_LIST_HEAD(&net->rules_ops); | |
714 | spin_lock_init(&net->rules_mod_lock); | |
715 | return 0; | |
716 | } | |
717 | ||
718 | static struct pernet_operations fib_rules_net_ops = { | |
719 | .init = fib_rules_net_init, | |
720 | }; | |
721 | ||
14c0b97d TG |
722 | static int __init fib_rules_init(void) |
723 | { | |
5fd30ee7 | 724 | int err; |
9d9e6a58 TG |
725 | rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL); |
726 | rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL); | |
c454673d | 727 | rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule); |
9d9e6a58 | 728 | |
5d6d4809 | 729 | err = register_pernet_subsys(&fib_rules_net_ops); |
5fd30ee7 DL |
730 | if (err < 0) |
731 | goto fail; | |
732 | ||
5d6d4809 | 733 | err = register_netdevice_notifier(&fib_rules_notifier); |
5fd30ee7 DL |
734 | if (err < 0) |
735 | goto fail_unregister; | |
5d6d4809 | 736 | |
5fd30ee7 DL |
737 | return 0; |
738 | ||
739 | fail_unregister: | |
5d6d4809 | 740 | unregister_pernet_subsys(&fib_rules_net_ops); |
5fd30ee7 DL |
741 | fail: |
742 | rtnl_unregister(PF_UNSPEC, RTM_NEWRULE); | |
743 | rtnl_unregister(PF_UNSPEC, RTM_DELRULE); | |
744 | rtnl_unregister(PF_UNSPEC, RTM_GETRULE); | |
745 | return err; | |
14c0b97d TG |
746 | } |
747 | ||
748 | subsys_initcall(fib_rules_init); |