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> |
3a9a231d | 15 | #include <linux/module.h> |
e9dc8653 | 16 | #include <net/net_namespace.h> |
881d966b | 17 | #include <net/sock.h> |
14c0b97d TG |
18 | #include <net/fib_rules.h> |
19 | ||
2994c638 DL |
20 | int fib_default_rule_add(struct fib_rules_ops *ops, |
21 | u32 pref, u32 table, u32 flags) | |
22 | { | |
23 | struct fib_rule *r; | |
24 | ||
25 | r = kzalloc(ops->rule_size, GFP_KERNEL); | |
26 | if (r == NULL) | |
27 | return -ENOMEM; | |
28 | ||
29 | atomic_set(&r->refcnt, 1); | |
30 | r->action = FR_ACT_TO_TBL; | |
31 | r->pref = pref; | |
32 | r->table = table; | |
33 | r->flags = flags; | |
3661a910 | 34 | r->fr_net = hold_net(ops->fro_net); |
2994c638 DL |
35 | |
36 | /* The lock is not required here, the list in unreacheable | |
37 | * at the moment this function is called */ | |
38 | list_add_tail(&r->list, &ops->rules_list); | |
39 | return 0; | |
40 | } | |
41 | EXPORT_SYMBOL(fib_default_rule_add); | |
42 | ||
d8a566be PM |
43 | u32 fib_default_rule_pref(struct fib_rules_ops *ops) |
44 | { | |
45 | struct list_head *pos; | |
46 | struct fib_rule *rule; | |
47 | ||
48 | if (!list_empty(&ops->rules_list)) { | |
49 | pos = ops->rules_list.next; | |
50 | if (pos->next != &ops->rules_list) { | |
51 | rule = list_entry(pos->next, struct fib_rule, list); | |
52 | if (rule->pref) | |
53 | return rule->pref - 1; | |
54 | } | |
55 | } | |
56 | ||
57 | return 0; | |
58 | } | |
59 | EXPORT_SYMBOL(fib_default_rule_pref); | |
60 | ||
9e3a5487 | 61 | static void notify_rule_change(int event, struct fib_rule *rule, |
c17084d2 TG |
62 | struct fib_rules_ops *ops, struct nlmsghdr *nlh, |
63 | u32 pid); | |
14c0b97d | 64 | |
5fd30ee7 | 65 | static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family) |
14c0b97d TG |
66 | { |
67 | struct fib_rules_ops *ops; | |
68 | ||
69 | rcu_read_lock(); | |
5fd30ee7 | 70 | list_for_each_entry_rcu(ops, &net->rules_ops, list) { |
14c0b97d TG |
71 | if (ops->family == family) { |
72 | if (!try_module_get(ops->owner)) | |
73 | ops = NULL; | |
74 | rcu_read_unlock(); | |
75 | return ops; | |
76 | } | |
77 | } | |
78 | rcu_read_unlock(); | |
79 | ||
80 | return NULL; | |
81 | } | |
82 | ||
83 | static void rules_ops_put(struct fib_rules_ops *ops) | |
84 | { | |
85 | if (ops) | |
86 | module_put(ops->owner); | |
87 | } | |
88 | ||
73417f61 TG |
89 | static void flush_route_cache(struct fib_rules_ops *ops) |
90 | { | |
91 | if (ops->flush_cache) | |
ae299fc0 | 92 | ops->flush_cache(ops); |
73417f61 TG |
93 | } |
94 | ||
e9c5158a | 95 | static int __fib_rules_register(struct fib_rules_ops *ops) |
14c0b97d TG |
96 | { |
97 | int err = -EEXIST; | |
98 | struct fib_rules_ops *o; | |
9e3a5487 DL |
99 | struct net *net; |
100 | ||
101 | net = ops->fro_net; | |
14c0b97d TG |
102 | |
103 | if (ops->rule_size < sizeof(struct fib_rule)) | |
104 | return -EINVAL; | |
105 | ||
106 | if (ops->match == NULL || ops->configure == NULL || | |
107 | ops->compare == NULL || ops->fill == NULL || | |
108 | ops->action == NULL) | |
109 | return -EINVAL; | |
110 | ||
5fd30ee7 DL |
111 | spin_lock(&net->rules_mod_lock); |
112 | list_for_each_entry(o, &net->rules_ops, list) | |
14c0b97d TG |
113 | if (ops->family == o->family) |
114 | goto errout; | |
115 | ||
5fd30ee7 DL |
116 | hold_net(net); |
117 | list_add_tail_rcu(&ops->list, &net->rules_ops); | |
14c0b97d TG |
118 | err = 0; |
119 | errout: | |
5fd30ee7 | 120 | spin_unlock(&net->rules_mod_lock); |
14c0b97d TG |
121 | |
122 | return err; | |
123 | } | |
124 | ||
e9c5158a | 125 | struct fib_rules_ops * |
3d0c9c4e | 126 | fib_rules_register(const struct fib_rules_ops *tmpl, struct net *net) |
e9c5158a EB |
127 | { |
128 | struct fib_rules_ops *ops; | |
129 | int err; | |
130 | ||
2fb3573d | 131 | ops = kmemdup(tmpl, sizeof(*ops), GFP_KERNEL); |
e9c5158a EB |
132 | if (ops == NULL) |
133 | return ERR_PTR(-ENOMEM); | |
134 | ||
135 | INIT_LIST_HEAD(&ops->rules_list); | |
136 | ops->fro_net = net; | |
137 | ||
138 | err = __fib_rules_register(ops); | |
139 | if (err) { | |
140 | kfree(ops); | |
141 | ops = ERR_PTR(err); | |
142 | } | |
143 | ||
144 | return ops; | |
145 | } | |
14c0b97d TG |
146 | EXPORT_SYMBOL_GPL(fib_rules_register); |
147 | ||
1df9916e | 148 | static void fib_rules_cleanup_ops(struct fib_rules_ops *ops) |
14c0b97d TG |
149 | { |
150 | struct fib_rule *rule, *tmp; | |
151 | ||
76c72d4f | 152 | list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) { |
14c0b97d | 153 | list_del_rcu(&rule->list); |
7a9bc9b8 DM |
154 | if (ops->delete) |
155 | ops->delete(rule); | |
14c0b97d TG |
156 | fib_rule_put(rule); |
157 | } | |
158 | } | |
159 | ||
e9c5158a EB |
160 | static void fib_rules_put_rcu(struct rcu_head *head) |
161 | { | |
162 | struct fib_rules_ops *ops = container_of(head, struct fib_rules_ops, rcu); | |
163 | struct net *net = ops->fro_net; | |
164 | ||
165 | release_net(net); | |
166 | kfree(ops); | |
167 | } | |
168 | ||
9e3a5487 | 169 | void fib_rules_unregister(struct fib_rules_ops *ops) |
14c0b97d | 170 | { |
9e3a5487 | 171 | struct net *net = ops->fro_net; |
14c0b97d | 172 | |
5fd30ee7 | 173 | spin_lock(&net->rules_mod_lock); |
72132c1b DL |
174 | list_del_rcu(&ops->list); |
175 | fib_rules_cleanup_ops(ops); | |
5fd30ee7 | 176 | spin_unlock(&net->rules_mod_lock); |
14c0b97d | 177 | |
e9c5158a | 178 | call_rcu(&ops->rcu, fib_rules_put_rcu); |
14c0b97d | 179 | } |
14c0b97d TG |
180 | EXPORT_SYMBOL_GPL(fib_rules_unregister); |
181 | ||
3dfbcc41 TG |
182 | static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops, |
183 | struct flowi *fl, int flags) | |
184 | { | |
185 | int ret = 0; | |
186 | ||
1d28f42c | 187 | if (rule->iifindex && (rule->iifindex != fl->flowi_iif)) |
3dfbcc41 TG |
188 | goto out; |
189 | ||
1d28f42c | 190 | if (rule->oifindex && (rule->oifindex != fl->flowi_oif)) |
1b038a5e PM |
191 | goto out; |
192 | ||
1d28f42c | 193 | if ((rule->mark ^ fl->flowi_mark) & rule->mark_mask) |
3dfbcc41 TG |
194 | goto out; |
195 | ||
196 | ret = ops->match(rule, fl, flags); | |
197 | out: | |
198 | return (rule->flags & FIB_RULE_INVERT) ? !ret : ret; | |
199 | } | |
200 | ||
14c0b97d TG |
201 | int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl, |
202 | int flags, struct fib_lookup_arg *arg) | |
203 | { | |
204 | struct fib_rule *rule; | |
205 | int err; | |
206 | ||
207 | rcu_read_lock(); | |
208 | ||
76c72d4f | 209 | list_for_each_entry_rcu(rule, &ops->rules_list, list) { |
0947c9fe | 210 | jumped: |
3dfbcc41 | 211 | if (!fib_rule_match(rule, ops, fl, flags)) |
14c0b97d TG |
212 | continue; |
213 | ||
0947c9fe TG |
214 | if (rule->action == FR_ACT_GOTO) { |
215 | struct fib_rule *target; | |
216 | ||
217 | target = rcu_dereference(rule->ctarget); | |
218 | if (target == NULL) { | |
219 | continue; | |
220 | } else { | |
221 | rule = target; | |
222 | goto jumped; | |
223 | } | |
fa0b2d1d TG |
224 | } else if (rule->action == FR_ACT_NOP) |
225 | continue; | |
226 | else | |
0947c9fe TG |
227 | err = ops->action(rule, fl, flags, arg); |
228 | ||
14c0b97d | 229 | if (err != -EAGAIN) { |
ebc0ffae ED |
230 | if ((arg->flags & FIB_LOOKUP_NOREF) || |
231 | likely(atomic_inc_not_zero(&rule->refcnt))) { | |
7fa7cb71 ED |
232 | arg->rule = rule; |
233 | goto out; | |
234 | } | |
235 | break; | |
14c0b97d TG |
236 | } |
237 | } | |
238 | ||
83886b6b | 239 | err = -ESRCH; |
14c0b97d TG |
240 | out: |
241 | rcu_read_unlock(); | |
242 | ||
243 | return err; | |
244 | } | |
14c0b97d TG |
245 | EXPORT_SYMBOL_GPL(fib_rules_lookup); |
246 | ||
e1701c68 TG |
247 | static int validate_rulemsg(struct fib_rule_hdr *frh, struct nlattr **tb, |
248 | struct fib_rules_ops *ops) | |
249 | { | |
250 | int err = -EINVAL; | |
251 | ||
252 | if (frh->src_len) | |
253 | if (tb[FRA_SRC] == NULL || | |
254 | frh->src_len > (ops->addr_size * 8) || | |
255 | nla_len(tb[FRA_SRC]) != ops->addr_size) | |
256 | goto errout; | |
257 | ||
258 | if (frh->dst_len) | |
259 | if (tb[FRA_DST] == NULL || | |
260 | frh->dst_len > (ops->addr_size * 8) || | |
261 | nla_len(tb[FRA_DST]) != ops->addr_size) | |
262 | goto errout; | |
263 | ||
264 | err = 0; | |
265 | errout: | |
266 | return err; | |
267 | } | |
268 | ||
9d9e6a58 | 269 | static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
14c0b97d | 270 | { |
3b1e0a65 | 271 | struct net *net = sock_net(skb->sk); |
14c0b97d TG |
272 | struct fib_rule_hdr *frh = nlmsg_data(nlh); |
273 | struct fib_rules_ops *ops = NULL; | |
274 | struct fib_rule *rule, *r, *last = NULL; | |
275 | struct nlattr *tb[FRA_MAX+1]; | |
0947c9fe | 276 | int err = -EINVAL, unresolved = 0; |
14c0b97d TG |
277 | |
278 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) | |
279 | goto errout; | |
280 | ||
5fd30ee7 | 281 | ops = lookup_rules_ops(net, frh->family); |
14c0b97d | 282 | if (ops == NULL) { |
2fe195cf | 283 | err = -EAFNOSUPPORT; |
14c0b97d TG |
284 | goto errout; |
285 | } | |
286 | ||
287 | err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy); | |
288 | if (err < 0) | |
289 | goto errout; | |
290 | ||
e1701c68 TG |
291 | err = validate_rulemsg(frh, tb, ops); |
292 | if (err < 0) | |
293 | goto errout; | |
294 | ||
14c0b97d TG |
295 | rule = kzalloc(ops->rule_size, GFP_KERNEL); |
296 | if (rule == NULL) { | |
297 | err = -ENOMEM; | |
298 | goto errout; | |
299 | } | |
3661a910 | 300 | rule->fr_net = hold_net(net); |
14c0b97d TG |
301 | |
302 | if (tb[FRA_PRIORITY]) | |
303 | rule->pref = nla_get_u32(tb[FRA_PRIORITY]); | |
304 | ||
491deb24 | 305 | if (tb[FRA_IIFNAME]) { |
14c0b97d TG |
306 | struct net_device *dev; |
307 | ||
491deb24 PM |
308 | rule->iifindex = -1; |
309 | nla_strlcpy(rule->iifname, tb[FRA_IIFNAME], IFNAMSIZ); | |
310 | dev = __dev_get_by_name(net, rule->iifname); | |
14c0b97d | 311 | if (dev) |
491deb24 | 312 | rule->iifindex = dev->ifindex; |
14c0b97d TG |
313 | } |
314 | ||
1b038a5e PM |
315 | if (tb[FRA_OIFNAME]) { |
316 | struct net_device *dev; | |
317 | ||
318 | rule->oifindex = -1; | |
319 | nla_strlcpy(rule->oifname, tb[FRA_OIFNAME], IFNAMSIZ); | |
320 | dev = __dev_get_by_name(net, rule->oifname); | |
321 | if (dev) | |
322 | rule->oifindex = dev->ifindex; | |
323 | } | |
324 | ||
b8964ed9 TG |
325 | if (tb[FRA_FWMARK]) { |
326 | rule->mark = nla_get_u32(tb[FRA_FWMARK]); | |
327 | if (rule->mark) | |
328 | /* compatibility: if the mark value is non-zero all bits | |
329 | * are compared unless a mask is explicitly specified. | |
330 | */ | |
331 | rule->mark_mask = 0xFFFFFFFF; | |
332 | } | |
333 | ||
334 | if (tb[FRA_FWMASK]) | |
335 | rule->mark_mask = nla_get_u32(tb[FRA_FWMASK]); | |
336 | ||
14c0b97d TG |
337 | rule->action = frh->action; |
338 | rule->flags = frh->flags; | |
9e762a4a | 339 | rule->table = frh_get_table(frh, tb); |
14c0b97d | 340 | |
5adef180 | 341 | if (!tb[FRA_PRIORITY] && ops->default_pref) |
868d13ac | 342 | rule->pref = ops->default_pref(ops); |
14c0b97d | 343 | |
0947c9fe TG |
344 | err = -EINVAL; |
345 | if (tb[FRA_GOTO]) { | |
346 | if (rule->action != FR_ACT_GOTO) | |
347 | goto errout_free; | |
348 | ||
349 | rule->target = nla_get_u32(tb[FRA_GOTO]); | |
350 | /* Backward jumps are prohibited to avoid endless loops */ | |
351 | if (rule->target <= rule->pref) | |
352 | goto errout_free; | |
353 | ||
76c72d4f | 354 | list_for_each_entry(r, &ops->rules_list, list) { |
0947c9fe | 355 | if (r->pref == rule->target) { |
7a2b03c5 | 356 | RCU_INIT_POINTER(rule->ctarget, r); |
0947c9fe TG |
357 | break; |
358 | } | |
359 | } | |
360 | ||
7a2b03c5 | 361 | if (rcu_dereference_protected(rule->ctarget, 1) == NULL) |
0947c9fe TG |
362 | unresolved = 1; |
363 | } else if (rule->action == FR_ACT_GOTO) | |
364 | goto errout_free; | |
365 | ||
8b3521ee | 366 | err = ops->configure(rule, skb, frh, tb); |
14c0b97d TG |
367 | if (err < 0) |
368 | goto errout_free; | |
369 | ||
76c72d4f | 370 | list_for_each_entry(r, &ops->rules_list, list) { |
14c0b97d TG |
371 | if (r->pref > rule->pref) |
372 | break; | |
373 | last = r; | |
374 | } | |
375 | ||
376 | fib_rule_get(rule); | |
377 | ||
ebb9fed2 ED |
378 | if (last) |
379 | list_add_rcu(&rule->list, &last->list); | |
380 | else | |
381 | list_add_rcu(&rule->list, &ops->rules_list); | |
382 | ||
0947c9fe TG |
383 | if (ops->unresolved_rules) { |
384 | /* | |
385 | * There are unresolved goto rules in the list, check if | |
386 | * any of them are pointing to this new rule. | |
387 | */ | |
76c72d4f | 388 | list_for_each_entry(r, &ops->rules_list, list) { |
0947c9fe | 389 | if (r->action == FR_ACT_GOTO && |
561dac2d G |
390 | r->target == rule->pref && |
391 | rtnl_dereference(r->ctarget) == NULL) { | |
0947c9fe TG |
392 | rcu_assign_pointer(r->ctarget, rule); |
393 | if (--ops->unresolved_rules == 0) | |
394 | break; | |
395 | } | |
396 | } | |
397 | } | |
398 | ||
399 | if (rule->action == FR_ACT_GOTO) | |
400 | ops->nr_goto_rules++; | |
401 | ||
402 | if (unresolved) | |
403 | ops->unresolved_rules++; | |
404 | ||
15e47304 | 405 | notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).portid); |
73417f61 | 406 | flush_route_cache(ops); |
14c0b97d TG |
407 | rules_ops_put(ops); |
408 | return 0; | |
409 | ||
410 | errout_free: | |
3661a910 | 411 | release_net(rule->fr_net); |
14c0b97d TG |
412 | kfree(rule); |
413 | errout: | |
414 | rules_ops_put(ops); | |
415 | return err; | |
416 | } | |
417 | ||
9d9e6a58 | 418 | static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
14c0b97d | 419 | { |
3b1e0a65 | 420 | struct net *net = sock_net(skb->sk); |
14c0b97d TG |
421 | struct fib_rule_hdr *frh = nlmsg_data(nlh); |
422 | struct fib_rules_ops *ops = NULL; | |
0947c9fe | 423 | struct fib_rule *rule, *tmp; |
14c0b97d TG |
424 | struct nlattr *tb[FRA_MAX+1]; |
425 | int err = -EINVAL; | |
426 | ||
427 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) | |
428 | goto errout; | |
429 | ||
5fd30ee7 | 430 | ops = lookup_rules_ops(net, frh->family); |
14c0b97d | 431 | if (ops == NULL) { |
2fe195cf | 432 | err = -EAFNOSUPPORT; |
14c0b97d TG |
433 | goto errout; |
434 | } | |
435 | ||
436 | err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy); | |
437 | if (err < 0) | |
438 | goto errout; | |
439 | ||
e1701c68 TG |
440 | err = validate_rulemsg(frh, tb, ops); |
441 | if (err < 0) | |
442 | goto errout; | |
443 | ||
76c72d4f | 444 | list_for_each_entry(rule, &ops->rules_list, list) { |
14c0b97d TG |
445 | if (frh->action && (frh->action != rule->action)) |
446 | continue; | |
447 | ||
9e762a4a | 448 | if (frh->table && (frh_get_table(frh, tb) != rule->table)) |
14c0b97d TG |
449 | continue; |
450 | ||
451 | if (tb[FRA_PRIORITY] && | |
452 | (rule->pref != nla_get_u32(tb[FRA_PRIORITY]))) | |
453 | continue; | |
454 | ||
491deb24 PM |
455 | if (tb[FRA_IIFNAME] && |
456 | nla_strcmp(tb[FRA_IIFNAME], rule->iifname)) | |
14c0b97d TG |
457 | continue; |
458 | ||
1b038a5e PM |
459 | if (tb[FRA_OIFNAME] && |
460 | nla_strcmp(tb[FRA_OIFNAME], rule->oifname)) | |
461 | continue; | |
462 | ||
b8964ed9 TG |
463 | if (tb[FRA_FWMARK] && |
464 | (rule->mark != nla_get_u32(tb[FRA_FWMARK]))) | |
465 | continue; | |
466 | ||
467 | if (tb[FRA_FWMASK] && | |
468 | (rule->mark_mask != nla_get_u32(tb[FRA_FWMASK]))) | |
469 | continue; | |
470 | ||
14c0b97d TG |
471 | if (!ops->compare(rule, frh, tb)) |
472 | continue; | |
473 | ||
474 | if (rule->flags & FIB_RULE_PERMANENT) { | |
475 | err = -EPERM; | |
476 | goto errout; | |
477 | } | |
478 | ||
479 | list_del_rcu(&rule->list); | |
0947c9fe | 480 | |
afaef734 | 481 | if (rule->action == FR_ACT_GOTO) { |
0947c9fe | 482 | ops->nr_goto_rules--; |
afaef734 YZ |
483 | if (rtnl_dereference(rule->ctarget) == NULL) |
484 | ops->unresolved_rules--; | |
485 | } | |
0947c9fe TG |
486 | |
487 | /* | |
488 | * Check if this rule is a target to any of them. If so, | |
489 | * disable them. As this operation is eventually very | |
490 | * expensive, it is only performed if goto rules have | |
491 | * actually been added. | |
492 | */ | |
493 | if (ops->nr_goto_rules > 0) { | |
76c72d4f | 494 | list_for_each_entry(tmp, &ops->rules_list, list) { |
7a2b03c5 | 495 | if (rtnl_dereference(tmp->ctarget) == rule) { |
a9b3cd7f | 496 | RCU_INIT_POINTER(tmp->ctarget, NULL); |
0947c9fe TG |
497 | ops->unresolved_rules++; |
498 | } | |
499 | } | |
500 | } | |
501 | ||
9e3a5487 | 502 | notify_rule_change(RTM_DELRULE, rule, ops, nlh, |
15e47304 | 503 | NETLINK_CB(skb).portid); |
7a9bc9b8 DM |
504 | if (ops->delete) |
505 | ops->delete(rule); | |
14c0b97d | 506 | fib_rule_put(rule); |
73417f61 | 507 | flush_route_cache(ops); |
14c0b97d TG |
508 | rules_ops_put(ops); |
509 | return 0; | |
510 | } | |
511 | ||
512 | err = -ENOENT; | |
513 | errout: | |
514 | rules_ops_put(ops); | |
515 | return err; | |
516 | } | |
517 | ||
339bf98f TG |
518 | static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops, |
519 | struct fib_rule *rule) | |
520 | { | |
521 | size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)) | |
491deb24 | 522 | + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */ |
1b038a5e | 523 | + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */ |
339bf98f TG |
524 | + nla_total_size(4) /* FRA_PRIORITY */ |
525 | + nla_total_size(4) /* FRA_TABLE */ | |
526 | + nla_total_size(4) /* FRA_FWMARK */ | |
527 | + nla_total_size(4); /* FRA_FWMASK */ | |
528 | ||
529 | if (ops->nlmsg_payload) | |
530 | payload += ops->nlmsg_payload(rule); | |
531 | ||
532 | return payload; | |
533 | } | |
534 | ||
14c0b97d TG |
535 | static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule, |
536 | u32 pid, u32 seq, int type, int flags, | |
537 | struct fib_rules_ops *ops) | |
538 | { | |
539 | struct nlmsghdr *nlh; | |
540 | struct fib_rule_hdr *frh; | |
541 | ||
542 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags); | |
543 | if (nlh == NULL) | |
26932566 | 544 | return -EMSGSIZE; |
14c0b97d TG |
545 | |
546 | frh = nlmsg_data(nlh); | |
28bb1726 | 547 | frh->family = ops->family; |
14c0b97d | 548 | frh->table = rule->table; |
0e3cea7b DM |
549 | if (nla_put_u32(skb, FRA_TABLE, rule->table)) |
550 | goto nla_put_failure; | |
14c0b97d TG |
551 | frh->res1 = 0; |
552 | frh->res2 = 0; | |
553 | frh->action = rule->action; | |
554 | frh->flags = rule->flags; | |
555 | ||
7a2b03c5 | 556 | if (rule->action == FR_ACT_GOTO && |
33d480ce | 557 | rcu_access_pointer(rule->ctarget) == NULL) |
0947c9fe TG |
558 | frh->flags |= FIB_RULE_UNRESOLVED; |
559 | ||
491deb24 | 560 | if (rule->iifname[0]) { |
0e3cea7b DM |
561 | if (nla_put_string(skb, FRA_IIFNAME, rule->iifname)) |
562 | goto nla_put_failure; | |
491deb24 PM |
563 | if (rule->iifindex == -1) |
564 | frh->flags |= FIB_RULE_IIF_DETACHED; | |
2b443683 TG |
565 | } |
566 | ||
1b038a5e | 567 | if (rule->oifname[0]) { |
0e3cea7b DM |
568 | if (nla_put_string(skb, FRA_OIFNAME, rule->oifname)) |
569 | goto nla_put_failure; | |
1b038a5e PM |
570 | if (rule->oifindex == -1) |
571 | frh->flags |= FIB_RULE_OIF_DETACHED; | |
572 | } | |
573 | ||
0e3cea7b DM |
574 | if ((rule->pref && |
575 | nla_put_u32(skb, FRA_PRIORITY, rule->pref)) || | |
576 | (rule->mark && | |
577 | nla_put_u32(skb, FRA_FWMARK, rule->mark)) || | |
578 | ((rule->mark_mask || rule->mark) && | |
579 | nla_put_u32(skb, FRA_FWMASK, rule->mark_mask)) || | |
580 | (rule->target && | |
581 | nla_put_u32(skb, FRA_GOTO, rule->target))) | |
582 | goto nla_put_failure; | |
04af8cf6 | 583 | if (ops->fill(rule, skb, frh) < 0) |
14c0b97d TG |
584 | goto nla_put_failure; |
585 | ||
586 | return nlmsg_end(skb, nlh); | |
587 | ||
588 | nla_put_failure: | |
26932566 PM |
589 | nlmsg_cancel(skb, nlh); |
590 | return -EMSGSIZE; | |
14c0b97d TG |
591 | } |
592 | ||
c454673d TG |
593 | static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb, |
594 | struct fib_rules_ops *ops) | |
14c0b97d TG |
595 | { |
596 | int idx = 0; | |
597 | struct fib_rule *rule; | |
14c0b97d | 598 | |
e67f88dd ED |
599 | rcu_read_lock(); |
600 | list_for_each_entry_rcu(rule, &ops->rules_list, list) { | |
c454673d | 601 | if (idx < cb->args[1]) |
14c0b97d TG |
602 | goto skip; |
603 | ||
15e47304 | 604 | if (fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).portid, |
14c0b97d TG |
605 | cb->nlh->nlmsg_seq, RTM_NEWRULE, |
606 | NLM_F_MULTI, ops) < 0) | |
607 | break; | |
608 | skip: | |
609 | idx++; | |
610 | } | |
2907c35f | 611 | rcu_read_unlock(); |
c454673d | 612 | cb->args[1] = idx; |
14c0b97d TG |
613 | rules_ops_put(ops); |
614 | ||
615 | return skb->len; | |
616 | } | |
617 | ||
c454673d TG |
618 | static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb) |
619 | { | |
3b1e0a65 | 620 | struct net *net = sock_net(skb->sk); |
c454673d TG |
621 | struct fib_rules_ops *ops; |
622 | int idx = 0, family; | |
623 | ||
624 | family = rtnl_msg_family(cb->nlh); | |
625 | if (family != AF_UNSPEC) { | |
626 | /* Protocol specific dump request */ | |
5fd30ee7 | 627 | ops = lookup_rules_ops(net, family); |
c454673d TG |
628 | if (ops == NULL) |
629 | return -EAFNOSUPPORT; | |
630 | ||
631 | return dump_rules(skb, cb, ops); | |
632 | } | |
633 | ||
634 | rcu_read_lock(); | |
5fd30ee7 | 635 | list_for_each_entry_rcu(ops, &net->rules_ops, list) { |
c454673d TG |
636 | if (idx < cb->args[0] || !try_module_get(ops->owner)) |
637 | goto skip; | |
638 | ||
639 | if (dump_rules(skb, cb, ops) < 0) | |
640 | break; | |
641 | ||
642 | cb->args[1] = 0; | |
2fb3573d | 643 | skip: |
c454673d TG |
644 | idx++; |
645 | } | |
646 | rcu_read_unlock(); | |
647 | cb->args[0] = idx; | |
648 | ||
649 | return skb->len; | |
650 | } | |
14c0b97d | 651 | |
9e3a5487 | 652 | static void notify_rule_change(int event, struct fib_rule *rule, |
c17084d2 TG |
653 | struct fib_rules_ops *ops, struct nlmsghdr *nlh, |
654 | u32 pid) | |
14c0b97d | 655 | { |
9e3a5487 | 656 | struct net *net; |
c17084d2 TG |
657 | struct sk_buff *skb; |
658 | int err = -ENOBUFS; | |
14c0b97d | 659 | |
9e3a5487 | 660 | net = ops->fro_net; |
339bf98f | 661 | skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL); |
14c0b97d | 662 | if (skb == NULL) |
c17084d2 TG |
663 | goto errout; |
664 | ||
665 | err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops); | |
26932566 PM |
666 | if (err < 0) { |
667 | /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */ | |
668 | WARN_ON(err == -EMSGSIZE); | |
669 | kfree_skb(skb); | |
670 | goto errout; | |
671 | } | |
9e3a5487 | 672 | |
1ce85fe4 PNA |
673 | rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL); |
674 | return; | |
c17084d2 TG |
675 | errout: |
676 | if (err < 0) | |
5fd30ee7 | 677 | rtnl_set_sk_err(net, ops->nlgroup, err); |
14c0b97d TG |
678 | } |
679 | ||
680 | static void attach_rules(struct list_head *rules, struct net_device *dev) | |
681 | { | |
682 | struct fib_rule *rule; | |
683 | ||
684 | list_for_each_entry(rule, rules, list) { | |
491deb24 PM |
685 | if (rule->iifindex == -1 && |
686 | strcmp(dev->name, rule->iifname) == 0) | |
687 | rule->iifindex = dev->ifindex; | |
1b038a5e PM |
688 | if (rule->oifindex == -1 && |
689 | strcmp(dev->name, rule->oifname) == 0) | |
690 | rule->oifindex = dev->ifindex; | |
14c0b97d TG |
691 | } |
692 | } | |
693 | ||
694 | static void detach_rules(struct list_head *rules, struct net_device *dev) | |
695 | { | |
696 | struct fib_rule *rule; | |
697 | ||
1b038a5e | 698 | list_for_each_entry(rule, rules, list) { |
491deb24 PM |
699 | if (rule->iifindex == dev->ifindex) |
700 | rule->iifindex = -1; | |
1b038a5e PM |
701 | if (rule->oifindex == dev->ifindex) |
702 | rule->oifindex = -1; | |
703 | } | |
14c0b97d TG |
704 | } |
705 | ||
706 | ||
707 | static int fib_rules_event(struct notifier_block *this, unsigned long event, | |
708 | void *ptr) | |
709 | { | |
710 | struct net_device *dev = ptr; | |
c346dca1 | 711 | struct net *net = dev_net(dev); |
14c0b97d TG |
712 | struct fib_rules_ops *ops; |
713 | ||
748e2d93 | 714 | ASSERT_RTNL(); |
14c0b97d TG |
715 | |
716 | switch (event) { | |
717 | case NETDEV_REGISTER: | |
5fd30ee7 | 718 | list_for_each_entry(ops, &net->rules_ops, list) |
76c72d4f | 719 | attach_rules(&ops->rules_list, dev); |
14c0b97d TG |
720 | break; |
721 | ||
722 | case NETDEV_UNREGISTER: | |
5fd30ee7 | 723 | list_for_each_entry(ops, &net->rules_ops, list) |
76c72d4f | 724 | detach_rules(&ops->rules_list, dev); |
14c0b97d TG |
725 | break; |
726 | } | |
727 | ||
14c0b97d TG |
728 | return NOTIFY_DONE; |
729 | } | |
730 | ||
731 | static struct notifier_block fib_rules_notifier = { | |
732 | .notifier_call = fib_rules_event, | |
733 | }; | |
734 | ||
2c8c1e72 | 735 | static int __net_init fib_rules_net_init(struct net *net) |
5fd30ee7 DL |
736 | { |
737 | INIT_LIST_HEAD(&net->rules_ops); | |
738 | spin_lock_init(&net->rules_mod_lock); | |
739 | return 0; | |
740 | } | |
741 | ||
742 | static struct pernet_operations fib_rules_net_ops = { | |
743 | .init = fib_rules_net_init, | |
744 | }; | |
745 | ||
14c0b97d TG |
746 | static int __init fib_rules_init(void) |
747 | { | |
5fd30ee7 | 748 | int err; |
c7ac8679 GR |
749 | rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL, NULL); |
750 | rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL, NULL); | |
751 | rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule, NULL); | |
9d9e6a58 | 752 | |
5d6d4809 | 753 | err = register_pernet_subsys(&fib_rules_net_ops); |
5fd30ee7 DL |
754 | if (err < 0) |
755 | goto fail; | |
756 | ||
5d6d4809 | 757 | err = register_netdevice_notifier(&fib_rules_notifier); |
5fd30ee7 DL |
758 | if (err < 0) |
759 | goto fail_unregister; | |
5d6d4809 | 760 | |
5fd30ee7 DL |
761 | return 0; |
762 | ||
763 | fail_unregister: | |
5d6d4809 | 764 | unregister_pernet_subsys(&fib_rules_net_ops); |
5fd30ee7 DL |
765 | fail: |
766 | rtnl_unregister(PF_UNSPEC, RTM_NEWRULE); | |
767 | rtnl_unregister(PF_UNSPEC, RTM_DELRULE); | |
768 | rtnl_unregister(PF_UNSPEC, RTM_GETRULE); | |
769 | return err; | |
14c0b97d TG |
770 | } |
771 | ||
772 | subsys_initcall(fib_rules_init); |