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> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
14c0b97d | 14 | #include <linux/list.h> |
e9dc8653 | 15 | #include <net/net_namespace.h> |
881d966b | 16 | #include <net/sock.h> |
14c0b97d TG |
17 | #include <net/fib_rules.h> |
18 | ||
2994c638 DL |
19 | int fib_default_rule_add(struct fib_rules_ops *ops, |
20 | u32 pref, u32 table, u32 flags) | |
21 | { | |
22 | struct fib_rule *r; | |
23 | ||
24 | r = kzalloc(ops->rule_size, GFP_KERNEL); | |
25 | if (r == NULL) | |
26 | return -ENOMEM; | |
27 | ||
28 | atomic_set(&r->refcnt, 1); | |
29 | r->action = FR_ACT_TO_TBL; | |
30 | r->pref = pref; | |
31 | r->table = table; | |
32 | r->flags = flags; | |
3661a910 | 33 | r->fr_net = hold_net(ops->fro_net); |
2994c638 DL |
34 | |
35 | /* The lock is not required here, the list in unreacheable | |
36 | * at the moment this function is called */ | |
37 | list_add_tail(&r->list, &ops->rules_list); | |
38 | return 0; | |
39 | } | |
40 | EXPORT_SYMBOL(fib_default_rule_add); | |
41 | ||
d8a566be PM |
42 | u32 fib_default_rule_pref(struct fib_rules_ops *ops) |
43 | { | |
44 | struct list_head *pos; | |
45 | struct fib_rule *rule; | |
46 | ||
47 | if (!list_empty(&ops->rules_list)) { | |
48 | pos = ops->rules_list.next; | |
49 | if (pos->next != &ops->rules_list) { | |
50 | rule = list_entry(pos->next, struct fib_rule, list); | |
51 | if (rule->pref) | |
52 | return rule->pref - 1; | |
53 | } | |
54 | } | |
55 | ||
56 | return 0; | |
57 | } | |
58 | EXPORT_SYMBOL(fib_default_rule_pref); | |
59 | ||
9e3a5487 | 60 | static void notify_rule_change(int event, struct fib_rule *rule, |
c17084d2 TG |
61 | struct fib_rules_ops *ops, struct nlmsghdr *nlh, |
62 | u32 pid); | |
14c0b97d | 63 | |
5fd30ee7 | 64 | static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family) |
14c0b97d TG |
65 | { |
66 | struct fib_rules_ops *ops; | |
67 | ||
68 | rcu_read_lock(); | |
5fd30ee7 | 69 | list_for_each_entry_rcu(ops, &net->rules_ops, list) { |
14c0b97d TG |
70 | if (ops->family == family) { |
71 | if (!try_module_get(ops->owner)) | |
72 | ops = NULL; | |
73 | rcu_read_unlock(); | |
74 | return ops; | |
75 | } | |
76 | } | |
77 | rcu_read_unlock(); | |
78 | ||
79 | return NULL; | |
80 | } | |
81 | ||
82 | static void rules_ops_put(struct fib_rules_ops *ops) | |
83 | { | |
84 | if (ops) | |
85 | module_put(ops->owner); | |
86 | } | |
87 | ||
73417f61 TG |
88 | static void flush_route_cache(struct fib_rules_ops *ops) |
89 | { | |
90 | if (ops->flush_cache) | |
ae299fc0 | 91 | ops->flush_cache(ops); |
73417f61 TG |
92 | } |
93 | ||
e9c5158a | 94 | static int __fib_rules_register(struct fib_rules_ops *ops) |
14c0b97d TG |
95 | { |
96 | int err = -EEXIST; | |
97 | struct fib_rules_ops *o; | |
9e3a5487 DL |
98 | struct net *net; |
99 | ||
100 | net = ops->fro_net; | |
14c0b97d TG |
101 | |
102 | if (ops->rule_size < sizeof(struct fib_rule)) | |
103 | return -EINVAL; | |
104 | ||
105 | if (ops->match == NULL || ops->configure == NULL || | |
106 | ops->compare == NULL || ops->fill == NULL || | |
107 | ops->action == NULL) | |
108 | return -EINVAL; | |
109 | ||
5fd30ee7 DL |
110 | spin_lock(&net->rules_mod_lock); |
111 | list_for_each_entry(o, &net->rules_ops, list) | |
14c0b97d TG |
112 | if (ops->family == o->family) |
113 | goto errout; | |
114 | ||
5fd30ee7 DL |
115 | hold_net(net); |
116 | list_add_tail_rcu(&ops->list, &net->rules_ops); | |
14c0b97d TG |
117 | err = 0; |
118 | errout: | |
5fd30ee7 | 119 | spin_unlock(&net->rules_mod_lock); |
14c0b97d TG |
120 | |
121 | return err; | |
122 | } | |
123 | ||
e9c5158a | 124 | struct fib_rules_ops * |
3d0c9c4e | 125 | fib_rules_register(const struct fib_rules_ops *tmpl, struct net *net) |
e9c5158a EB |
126 | { |
127 | struct fib_rules_ops *ops; | |
128 | int err; | |
129 | ||
2fb3573d | 130 | ops = kmemdup(tmpl, sizeof(*ops), GFP_KERNEL); |
e9c5158a EB |
131 | if (ops == NULL) |
132 | return ERR_PTR(-ENOMEM); | |
133 | ||
134 | INIT_LIST_HEAD(&ops->rules_list); | |
135 | ops->fro_net = net; | |
136 | ||
137 | err = __fib_rules_register(ops); | |
138 | if (err) { | |
139 | kfree(ops); | |
140 | ops = ERR_PTR(err); | |
141 | } | |
142 | ||
143 | return ops; | |
144 | } | |
14c0b97d TG |
145 | EXPORT_SYMBOL_GPL(fib_rules_register); |
146 | ||
1df9916e | 147 | static void fib_rules_cleanup_ops(struct fib_rules_ops *ops) |
14c0b97d TG |
148 | { |
149 | struct fib_rule *rule, *tmp; | |
150 | ||
76c72d4f | 151 | list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) { |
14c0b97d TG |
152 | list_del_rcu(&rule->list); |
153 | fib_rule_put(rule); | |
154 | } | |
155 | } | |
156 | ||
e9c5158a EB |
157 | static void fib_rules_put_rcu(struct rcu_head *head) |
158 | { | |
159 | struct fib_rules_ops *ops = container_of(head, struct fib_rules_ops, rcu); | |
160 | struct net *net = ops->fro_net; | |
161 | ||
162 | release_net(net); | |
163 | kfree(ops); | |
164 | } | |
165 | ||
9e3a5487 | 166 | void fib_rules_unregister(struct fib_rules_ops *ops) |
14c0b97d | 167 | { |
9e3a5487 | 168 | struct net *net = ops->fro_net; |
14c0b97d | 169 | |
5fd30ee7 | 170 | spin_lock(&net->rules_mod_lock); |
72132c1b DL |
171 | list_del_rcu(&ops->list); |
172 | fib_rules_cleanup_ops(ops); | |
5fd30ee7 | 173 | spin_unlock(&net->rules_mod_lock); |
14c0b97d | 174 | |
e9c5158a | 175 | call_rcu(&ops->rcu, fib_rules_put_rcu); |
14c0b97d | 176 | } |
14c0b97d TG |
177 | EXPORT_SYMBOL_GPL(fib_rules_unregister); |
178 | ||
3dfbcc41 TG |
179 | static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops, |
180 | struct flowi *fl, int flags) | |
181 | { | |
182 | int ret = 0; | |
183 | ||
1d28f42c | 184 | if (rule->iifindex && (rule->iifindex != fl->flowi_iif)) |
3dfbcc41 TG |
185 | goto out; |
186 | ||
1d28f42c | 187 | if (rule->oifindex && (rule->oifindex != fl->flowi_oif)) |
1b038a5e PM |
188 | goto out; |
189 | ||
1d28f42c | 190 | if ((rule->mark ^ fl->flowi_mark) & rule->mark_mask) |
3dfbcc41 TG |
191 | goto out; |
192 | ||
193 | ret = ops->match(rule, fl, flags); | |
194 | out: | |
195 | return (rule->flags & FIB_RULE_INVERT) ? !ret : ret; | |
196 | } | |
197 | ||
14c0b97d TG |
198 | int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl, |
199 | int flags, struct fib_lookup_arg *arg) | |
200 | { | |
201 | struct fib_rule *rule; | |
202 | int err; | |
203 | ||
204 | rcu_read_lock(); | |
205 | ||
76c72d4f | 206 | list_for_each_entry_rcu(rule, &ops->rules_list, list) { |
0947c9fe | 207 | jumped: |
3dfbcc41 | 208 | if (!fib_rule_match(rule, ops, fl, flags)) |
14c0b97d TG |
209 | continue; |
210 | ||
0947c9fe TG |
211 | if (rule->action == FR_ACT_GOTO) { |
212 | struct fib_rule *target; | |
213 | ||
214 | target = rcu_dereference(rule->ctarget); | |
215 | if (target == NULL) { | |
216 | continue; | |
217 | } else { | |
218 | rule = target; | |
219 | goto jumped; | |
220 | } | |
fa0b2d1d TG |
221 | } else if (rule->action == FR_ACT_NOP) |
222 | continue; | |
223 | else | |
0947c9fe TG |
224 | err = ops->action(rule, fl, flags, arg); |
225 | ||
14c0b97d | 226 | if (err != -EAGAIN) { |
ebc0ffae ED |
227 | if ((arg->flags & FIB_LOOKUP_NOREF) || |
228 | likely(atomic_inc_not_zero(&rule->refcnt))) { | |
7fa7cb71 ED |
229 | arg->rule = rule; |
230 | goto out; | |
231 | } | |
232 | break; | |
14c0b97d TG |
233 | } |
234 | } | |
235 | ||
83886b6b | 236 | err = -ESRCH; |
14c0b97d TG |
237 | out: |
238 | rcu_read_unlock(); | |
239 | ||
240 | return err; | |
241 | } | |
14c0b97d TG |
242 | EXPORT_SYMBOL_GPL(fib_rules_lookup); |
243 | ||
e1701c68 TG |
244 | static int validate_rulemsg(struct fib_rule_hdr *frh, struct nlattr **tb, |
245 | struct fib_rules_ops *ops) | |
246 | { | |
247 | int err = -EINVAL; | |
248 | ||
249 | if (frh->src_len) | |
250 | if (tb[FRA_SRC] == NULL || | |
251 | frh->src_len > (ops->addr_size * 8) || | |
252 | nla_len(tb[FRA_SRC]) != ops->addr_size) | |
253 | goto errout; | |
254 | ||
255 | if (frh->dst_len) | |
256 | if (tb[FRA_DST] == NULL || | |
257 | frh->dst_len > (ops->addr_size * 8) || | |
258 | nla_len(tb[FRA_DST]) != ops->addr_size) | |
259 | goto errout; | |
260 | ||
261 | err = 0; | |
262 | errout: | |
263 | return err; | |
264 | } | |
265 | ||
9d9e6a58 | 266 | static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
14c0b97d | 267 | { |
3b1e0a65 | 268 | struct net *net = sock_net(skb->sk); |
14c0b97d TG |
269 | struct fib_rule_hdr *frh = nlmsg_data(nlh); |
270 | struct fib_rules_ops *ops = NULL; | |
271 | struct fib_rule *rule, *r, *last = NULL; | |
272 | struct nlattr *tb[FRA_MAX+1]; | |
0947c9fe | 273 | int err = -EINVAL, unresolved = 0; |
14c0b97d TG |
274 | |
275 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) | |
276 | goto errout; | |
277 | ||
5fd30ee7 | 278 | ops = lookup_rules_ops(net, frh->family); |
14c0b97d | 279 | if (ops == NULL) { |
2fe195cf | 280 | err = -EAFNOSUPPORT; |
14c0b97d TG |
281 | goto errout; |
282 | } | |
283 | ||
284 | err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy); | |
285 | if (err < 0) | |
286 | goto errout; | |
287 | ||
e1701c68 TG |
288 | err = validate_rulemsg(frh, tb, ops); |
289 | if (err < 0) | |
290 | goto errout; | |
291 | ||
14c0b97d TG |
292 | rule = kzalloc(ops->rule_size, GFP_KERNEL); |
293 | if (rule == NULL) { | |
294 | err = -ENOMEM; | |
295 | goto errout; | |
296 | } | |
3661a910 | 297 | rule->fr_net = hold_net(net); |
14c0b97d TG |
298 | |
299 | if (tb[FRA_PRIORITY]) | |
300 | rule->pref = nla_get_u32(tb[FRA_PRIORITY]); | |
301 | ||
491deb24 | 302 | if (tb[FRA_IIFNAME]) { |
14c0b97d TG |
303 | struct net_device *dev; |
304 | ||
491deb24 PM |
305 | rule->iifindex = -1; |
306 | nla_strlcpy(rule->iifname, tb[FRA_IIFNAME], IFNAMSIZ); | |
307 | dev = __dev_get_by_name(net, rule->iifname); | |
14c0b97d | 308 | if (dev) |
491deb24 | 309 | rule->iifindex = dev->ifindex; |
14c0b97d TG |
310 | } |
311 | ||
1b038a5e PM |
312 | if (tb[FRA_OIFNAME]) { |
313 | struct net_device *dev; | |
314 | ||
315 | rule->oifindex = -1; | |
316 | nla_strlcpy(rule->oifname, tb[FRA_OIFNAME], IFNAMSIZ); | |
317 | dev = __dev_get_by_name(net, rule->oifname); | |
318 | if (dev) | |
319 | rule->oifindex = dev->ifindex; | |
320 | } | |
321 | ||
b8964ed9 TG |
322 | if (tb[FRA_FWMARK]) { |
323 | rule->mark = nla_get_u32(tb[FRA_FWMARK]); | |
324 | if (rule->mark) | |
325 | /* compatibility: if the mark value is non-zero all bits | |
326 | * are compared unless a mask is explicitly specified. | |
327 | */ | |
328 | rule->mark_mask = 0xFFFFFFFF; | |
329 | } | |
330 | ||
331 | if (tb[FRA_FWMASK]) | |
332 | rule->mark_mask = nla_get_u32(tb[FRA_FWMASK]); | |
333 | ||
14c0b97d TG |
334 | rule->action = frh->action; |
335 | rule->flags = frh->flags; | |
9e762a4a | 336 | rule->table = frh_get_table(frh, tb); |
14c0b97d | 337 | |
5adef180 | 338 | if (!tb[FRA_PRIORITY] && ops->default_pref) |
868d13ac | 339 | rule->pref = ops->default_pref(ops); |
14c0b97d | 340 | |
0947c9fe TG |
341 | err = -EINVAL; |
342 | if (tb[FRA_GOTO]) { | |
343 | if (rule->action != FR_ACT_GOTO) | |
344 | goto errout_free; | |
345 | ||
346 | rule->target = nla_get_u32(tb[FRA_GOTO]); | |
347 | /* Backward jumps are prohibited to avoid endless loops */ | |
348 | if (rule->target <= rule->pref) | |
349 | goto errout_free; | |
350 | ||
76c72d4f | 351 | list_for_each_entry(r, &ops->rules_list, list) { |
0947c9fe | 352 | if (r->pref == rule->target) { |
7a2b03c5 | 353 | RCU_INIT_POINTER(rule->ctarget, r); |
0947c9fe TG |
354 | break; |
355 | } | |
356 | } | |
357 | ||
7a2b03c5 | 358 | if (rcu_dereference_protected(rule->ctarget, 1) == NULL) |
0947c9fe TG |
359 | unresolved = 1; |
360 | } else if (rule->action == FR_ACT_GOTO) | |
361 | goto errout_free; | |
362 | ||
8b3521ee | 363 | err = ops->configure(rule, skb, frh, tb); |
14c0b97d TG |
364 | if (err < 0) |
365 | goto errout_free; | |
366 | ||
76c72d4f | 367 | list_for_each_entry(r, &ops->rules_list, list) { |
14c0b97d TG |
368 | if (r->pref > rule->pref) |
369 | break; | |
370 | last = r; | |
371 | } | |
372 | ||
373 | fib_rule_get(rule); | |
374 | ||
ebb9fed2 ED |
375 | if (last) |
376 | list_add_rcu(&rule->list, &last->list); | |
377 | else | |
378 | list_add_rcu(&rule->list, &ops->rules_list); | |
379 | ||
0947c9fe TG |
380 | if (ops->unresolved_rules) { |
381 | /* | |
382 | * There are unresolved goto rules in the list, check if | |
383 | * any of them are pointing to this new rule. | |
384 | */ | |
76c72d4f | 385 | list_for_each_entry(r, &ops->rules_list, list) { |
0947c9fe TG |
386 | if (r->action == FR_ACT_GOTO && |
387 | r->target == rule->pref) { | |
7a2b03c5 | 388 | BUG_ON(rtnl_dereference(r->ctarget) != NULL); |
0947c9fe TG |
389 | rcu_assign_pointer(r->ctarget, rule); |
390 | if (--ops->unresolved_rules == 0) | |
391 | break; | |
392 | } | |
393 | } | |
394 | } | |
395 | ||
396 | if (rule->action == FR_ACT_GOTO) | |
397 | ops->nr_goto_rules++; | |
398 | ||
399 | if (unresolved) | |
400 | ops->unresolved_rules++; | |
401 | ||
9e3a5487 | 402 | notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).pid); |
73417f61 | 403 | flush_route_cache(ops); |
14c0b97d TG |
404 | rules_ops_put(ops); |
405 | return 0; | |
406 | ||
407 | errout_free: | |
3661a910 | 408 | release_net(rule->fr_net); |
14c0b97d TG |
409 | kfree(rule); |
410 | errout: | |
411 | rules_ops_put(ops); | |
412 | return err; | |
413 | } | |
414 | ||
9d9e6a58 | 415 | static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
14c0b97d | 416 | { |
3b1e0a65 | 417 | struct net *net = sock_net(skb->sk); |
14c0b97d TG |
418 | struct fib_rule_hdr *frh = nlmsg_data(nlh); |
419 | struct fib_rules_ops *ops = NULL; | |
0947c9fe | 420 | struct fib_rule *rule, *tmp; |
14c0b97d TG |
421 | struct nlattr *tb[FRA_MAX+1]; |
422 | int err = -EINVAL; | |
423 | ||
424 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) | |
425 | goto errout; | |
426 | ||
5fd30ee7 | 427 | ops = lookup_rules_ops(net, frh->family); |
14c0b97d | 428 | if (ops == NULL) { |
2fe195cf | 429 | err = -EAFNOSUPPORT; |
14c0b97d TG |
430 | goto errout; |
431 | } | |
432 | ||
433 | err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy); | |
434 | if (err < 0) | |
435 | goto errout; | |
436 | ||
e1701c68 TG |
437 | err = validate_rulemsg(frh, tb, ops); |
438 | if (err < 0) | |
439 | goto errout; | |
440 | ||
76c72d4f | 441 | list_for_each_entry(rule, &ops->rules_list, list) { |
14c0b97d TG |
442 | if (frh->action && (frh->action != rule->action)) |
443 | continue; | |
444 | ||
9e762a4a | 445 | if (frh->table && (frh_get_table(frh, tb) != rule->table)) |
14c0b97d TG |
446 | continue; |
447 | ||
448 | if (tb[FRA_PRIORITY] && | |
449 | (rule->pref != nla_get_u32(tb[FRA_PRIORITY]))) | |
450 | continue; | |
451 | ||
491deb24 PM |
452 | if (tb[FRA_IIFNAME] && |
453 | nla_strcmp(tb[FRA_IIFNAME], rule->iifname)) | |
14c0b97d TG |
454 | continue; |
455 | ||
1b038a5e PM |
456 | if (tb[FRA_OIFNAME] && |
457 | nla_strcmp(tb[FRA_OIFNAME], rule->oifname)) | |
458 | continue; | |
459 | ||
b8964ed9 TG |
460 | if (tb[FRA_FWMARK] && |
461 | (rule->mark != nla_get_u32(tb[FRA_FWMARK]))) | |
462 | continue; | |
463 | ||
464 | if (tb[FRA_FWMASK] && | |
465 | (rule->mark_mask != nla_get_u32(tb[FRA_FWMASK]))) | |
466 | continue; | |
467 | ||
14c0b97d TG |
468 | if (!ops->compare(rule, frh, tb)) |
469 | continue; | |
470 | ||
471 | if (rule->flags & FIB_RULE_PERMANENT) { | |
472 | err = -EPERM; | |
473 | goto errout; | |
474 | } | |
475 | ||
476 | list_del_rcu(&rule->list); | |
0947c9fe TG |
477 | |
478 | if (rule->action == FR_ACT_GOTO) | |
479 | ops->nr_goto_rules--; | |
480 | ||
481 | /* | |
482 | * Check if this rule is a target to any of them. If so, | |
483 | * disable them. As this operation is eventually very | |
484 | * expensive, it is only performed if goto rules have | |
485 | * actually been added. | |
486 | */ | |
487 | if (ops->nr_goto_rules > 0) { | |
76c72d4f | 488 | list_for_each_entry(tmp, &ops->rules_list, list) { |
7a2b03c5 | 489 | if (rtnl_dereference(tmp->ctarget) == rule) { |
0947c9fe TG |
490 | rcu_assign_pointer(tmp->ctarget, NULL); |
491 | ops->unresolved_rules++; | |
492 | } | |
493 | } | |
494 | } | |
495 | ||
9e3a5487 | 496 | notify_rule_change(RTM_DELRULE, rule, ops, nlh, |
c17084d2 | 497 | NETLINK_CB(skb).pid); |
14c0b97d | 498 | fib_rule_put(rule); |
73417f61 | 499 | flush_route_cache(ops); |
14c0b97d TG |
500 | rules_ops_put(ops); |
501 | return 0; | |
502 | } | |
503 | ||
504 | err = -ENOENT; | |
505 | errout: | |
506 | rules_ops_put(ops); | |
507 | return err; | |
508 | } | |
509 | ||
339bf98f TG |
510 | static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops, |
511 | struct fib_rule *rule) | |
512 | { | |
513 | size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)) | |
491deb24 | 514 | + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */ |
1b038a5e | 515 | + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */ |
339bf98f TG |
516 | + nla_total_size(4) /* FRA_PRIORITY */ |
517 | + nla_total_size(4) /* FRA_TABLE */ | |
518 | + nla_total_size(4) /* FRA_FWMARK */ | |
519 | + nla_total_size(4); /* FRA_FWMASK */ | |
520 | ||
521 | if (ops->nlmsg_payload) | |
522 | payload += ops->nlmsg_payload(rule); | |
523 | ||
524 | return payload; | |
525 | } | |
526 | ||
14c0b97d TG |
527 | static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule, |
528 | u32 pid, u32 seq, int type, int flags, | |
529 | struct fib_rules_ops *ops) | |
530 | { | |
531 | struct nlmsghdr *nlh; | |
532 | struct fib_rule_hdr *frh; | |
533 | ||
534 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags); | |
535 | if (nlh == NULL) | |
26932566 | 536 | return -EMSGSIZE; |
14c0b97d TG |
537 | |
538 | frh = nlmsg_data(nlh); | |
28bb1726 | 539 | frh->family = ops->family; |
14c0b97d | 540 | frh->table = rule->table; |
9e762a4a | 541 | NLA_PUT_U32(skb, FRA_TABLE, rule->table); |
14c0b97d TG |
542 | frh->res1 = 0; |
543 | frh->res2 = 0; | |
544 | frh->action = rule->action; | |
545 | frh->flags = rule->flags; | |
546 | ||
7a2b03c5 ED |
547 | if (rule->action == FR_ACT_GOTO && |
548 | rcu_dereference_raw(rule->ctarget) == NULL) | |
0947c9fe TG |
549 | frh->flags |= FIB_RULE_UNRESOLVED; |
550 | ||
491deb24 PM |
551 | if (rule->iifname[0]) { |
552 | NLA_PUT_STRING(skb, FRA_IIFNAME, rule->iifname); | |
14c0b97d | 553 | |
491deb24 PM |
554 | if (rule->iifindex == -1) |
555 | frh->flags |= FIB_RULE_IIF_DETACHED; | |
2b443683 TG |
556 | } |
557 | ||
1b038a5e PM |
558 | if (rule->oifname[0]) { |
559 | NLA_PUT_STRING(skb, FRA_OIFNAME, rule->oifname); | |
560 | ||
561 | if (rule->oifindex == -1) | |
562 | frh->flags |= FIB_RULE_OIF_DETACHED; | |
563 | } | |
564 | ||
14c0b97d TG |
565 | if (rule->pref) |
566 | NLA_PUT_U32(skb, FRA_PRIORITY, rule->pref); | |
567 | ||
b8964ed9 TG |
568 | if (rule->mark) |
569 | NLA_PUT_U32(skb, FRA_FWMARK, rule->mark); | |
570 | ||
571 | if (rule->mark_mask || rule->mark) | |
572 | NLA_PUT_U32(skb, FRA_FWMASK, rule->mark_mask); | |
573 | ||
0947c9fe TG |
574 | if (rule->target) |
575 | NLA_PUT_U32(skb, FRA_GOTO, rule->target); | |
576 | ||
04af8cf6 | 577 | if (ops->fill(rule, skb, frh) < 0) |
14c0b97d TG |
578 | goto nla_put_failure; |
579 | ||
580 | return nlmsg_end(skb, nlh); | |
581 | ||
582 | nla_put_failure: | |
26932566 PM |
583 | nlmsg_cancel(skb, nlh); |
584 | return -EMSGSIZE; | |
14c0b97d TG |
585 | } |
586 | ||
c454673d TG |
587 | static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb, |
588 | struct fib_rules_ops *ops) | |
14c0b97d TG |
589 | { |
590 | int idx = 0; | |
591 | struct fib_rule *rule; | |
14c0b97d | 592 | |
e67f88dd ED |
593 | rcu_read_lock(); |
594 | list_for_each_entry_rcu(rule, &ops->rules_list, list) { | |
c454673d | 595 | if (idx < cb->args[1]) |
14c0b97d TG |
596 | goto skip; |
597 | ||
598 | if (fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).pid, | |
599 | cb->nlh->nlmsg_seq, RTM_NEWRULE, | |
600 | NLM_F_MULTI, ops) < 0) | |
601 | break; | |
602 | skip: | |
603 | idx++; | |
604 | } | |
2907c35f | 605 | rcu_read_unlock(); |
c454673d | 606 | cb->args[1] = idx; |
14c0b97d TG |
607 | rules_ops_put(ops); |
608 | ||
609 | return skb->len; | |
610 | } | |
611 | ||
c454673d TG |
612 | static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb) |
613 | { | |
3b1e0a65 | 614 | struct net *net = sock_net(skb->sk); |
c454673d TG |
615 | struct fib_rules_ops *ops; |
616 | int idx = 0, family; | |
617 | ||
618 | family = rtnl_msg_family(cb->nlh); | |
619 | if (family != AF_UNSPEC) { | |
620 | /* Protocol specific dump request */ | |
5fd30ee7 | 621 | ops = lookup_rules_ops(net, family); |
c454673d TG |
622 | if (ops == NULL) |
623 | return -EAFNOSUPPORT; | |
624 | ||
625 | return dump_rules(skb, cb, ops); | |
626 | } | |
627 | ||
628 | rcu_read_lock(); | |
5fd30ee7 | 629 | list_for_each_entry_rcu(ops, &net->rules_ops, list) { |
c454673d TG |
630 | if (idx < cb->args[0] || !try_module_get(ops->owner)) |
631 | goto skip; | |
632 | ||
633 | if (dump_rules(skb, cb, ops) < 0) | |
634 | break; | |
635 | ||
636 | cb->args[1] = 0; | |
2fb3573d | 637 | skip: |
c454673d TG |
638 | idx++; |
639 | } | |
640 | rcu_read_unlock(); | |
641 | cb->args[0] = idx; | |
642 | ||
643 | return skb->len; | |
644 | } | |
14c0b97d | 645 | |
9e3a5487 | 646 | static void notify_rule_change(int event, struct fib_rule *rule, |
c17084d2 TG |
647 | struct fib_rules_ops *ops, struct nlmsghdr *nlh, |
648 | u32 pid) | |
14c0b97d | 649 | { |
9e3a5487 | 650 | struct net *net; |
c17084d2 TG |
651 | struct sk_buff *skb; |
652 | int err = -ENOBUFS; | |
14c0b97d | 653 | |
9e3a5487 | 654 | net = ops->fro_net; |
339bf98f | 655 | skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL); |
14c0b97d | 656 | if (skb == NULL) |
c17084d2 TG |
657 | goto errout; |
658 | ||
659 | err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops); | |
26932566 PM |
660 | if (err < 0) { |
661 | /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */ | |
662 | WARN_ON(err == -EMSGSIZE); | |
663 | kfree_skb(skb); | |
664 | goto errout; | |
665 | } | |
9e3a5487 | 666 | |
1ce85fe4 PNA |
667 | rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL); |
668 | return; | |
c17084d2 TG |
669 | errout: |
670 | if (err < 0) | |
5fd30ee7 | 671 | rtnl_set_sk_err(net, ops->nlgroup, err); |
14c0b97d TG |
672 | } |
673 | ||
674 | static void attach_rules(struct list_head *rules, struct net_device *dev) | |
675 | { | |
676 | struct fib_rule *rule; | |
677 | ||
678 | list_for_each_entry(rule, rules, list) { | |
491deb24 PM |
679 | if (rule->iifindex == -1 && |
680 | strcmp(dev->name, rule->iifname) == 0) | |
681 | rule->iifindex = dev->ifindex; | |
1b038a5e PM |
682 | if (rule->oifindex == -1 && |
683 | strcmp(dev->name, rule->oifname) == 0) | |
684 | rule->oifindex = dev->ifindex; | |
14c0b97d TG |
685 | } |
686 | } | |
687 | ||
688 | static void detach_rules(struct list_head *rules, struct net_device *dev) | |
689 | { | |
690 | struct fib_rule *rule; | |
691 | ||
1b038a5e | 692 | list_for_each_entry(rule, rules, list) { |
491deb24 PM |
693 | if (rule->iifindex == dev->ifindex) |
694 | rule->iifindex = -1; | |
1b038a5e PM |
695 | if (rule->oifindex == dev->ifindex) |
696 | rule->oifindex = -1; | |
697 | } | |
14c0b97d TG |
698 | } |
699 | ||
700 | ||
701 | static int fib_rules_event(struct notifier_block *this, unsigned long event, | |
702 | void *ptr) | |
703 | { | |
704 | struct net_device *dev = ptr; | |
c346dca1 | 705 | struct net *net = dev_net(dev); |
14c0b97d TG |
706 | struct fib_rules_ops *ops; |
707 | ||
708 | ASSERT_RTNL(); | |
14c0b97d TG |
709 | |
710 | switch (event) { | |
711 | case NETDEV_REGISTER: | |
5fd30ee7 | 712 | list_for_each_entry(ops, &net->rules_ops, list) |
76c72d4f | 713 | attach_rules(&ops->rules_list, dev); |
14c0b97d TG |
714 | break; |
715 | ||
716 | case NETDEV_UNREGISTER: | |
5fd30ee7 | 717 | list_for_each_entry(ops, &net->rules_ops, list) |
76c72d4f | 718 | detach_rules(&ops->rules_list, dev); |
14c0b97d TG |
719 | break; |
720 | } | |
721 | ||
14c0b97d TG |
722 | return NOTIFY_DONE; |
723 | } | |
724 | ||
725 | static struct notifier_block fib_rules_notifier = { | |
726 | .notifier_call = fib_rules_event, | |
727 | }; | |
728 | ||
2c8c1e72 | 729 | static int __net_init fib_rules_net_init(struct net *net) |
5fd30ee7 DL |
730 | { |
731 | INIT_LIST_HEAD(&net->rules_ops); | |
732 | spin_lock_init(&net->rules_mod_lock); | |
733 | return 0; | |
734 | } | |
735 | ||
736 | static struct pernet_operations fib_rules_net_ops = { | |
737 | .init = fib_rules_net_init, | |
738 | }; | |
739 | ||
14c0b97d TG |
740 | static int __init fib_rules_init(void) |
741 | { | |
5fd30ee7 | 742 | int err; |
c7ac8679 GR |
743 | rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL, NULL); |
744 | rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL, NULL); | |
745 | rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule, NULL); | |
9d9e6a58 | 746 | |
5d6d4809 | 747 | err = register_pernet_subsys(&fib_rules_net_ops); |
5fd30ee7 DL |
748 | if (err < 0) |
749 | goto fail; | |
750 | ||
5d6d4809 | 751 | err = register_netdevice_notifier(&fib_rules_notifier); |
5fd30ee7 DL |
752 | if (err < 0) |
753 | goto fail_unregister; | |
5d6d4809 | 754 | |
5fd30ee7 DL |
755 | return 0; |
756 | ||
757 | fail_unregister: | |
5d6d4809 | 758 | unregister_pernet_subsys(&fib_rules_net_ops); |
5fd30ee7 DL |
759 | fail: |
760 | rtnl_unregister(PF_UNSPEC, RTM_NEWRULE); | |
761 | rtnl_unregister(PF_UNSPEC, RTM_DELRULE); | |
762 | rtnl_unregister(PF_UNSPEC, RTM_GETRULE); | |
763 | return err; | |
14c0b97d TG |
764 | } |
765 | ||
766 | subsys_initcall(fib_rules_init); |