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 | 18 | #include <net/fib_rules.h> |
e7030878 | 19 | #include <net/ip_tunnels.h> |
14c0b97d | 20 | |
2994c638 DL |
21 | int fib_default_rule_add(struct fib_rules_ops *ops, |
22 | u32 pref, u32 table, u32 flags) | |
23 | { | |
24 | struct fib_rule *r; | |
25 | ||
26 | r = kzalloc(ops->rule_size, GFP_KERNEL); | |
27 | if (r == NULL) | |
28 | return -ENOMEM; | |
29 | ||
30 | atomic_set(&r->refcnt, 1); | |
31 | r->action = FR_ACT_TO_TBL; | |
32 | r->pref = pref; | |
33 | r->table = table; | |
34 | r->flags = flags; | |
efd7ef1c | 35 | r->fr_net = ops->fro_net; |
2994c638 | 36 | |
73f5698e ST |
37 | r->suppress_prefixlen = -1; |
38 | r->suppress_ifgroup = -1; | |
39 | ||
2994c638 DL |
40 | /* The lock is not required here, the list in unreacheable |
41 | * at the moment this function is called */ | |
42 | list_add_tail(&r->list, &ops->rules_list); | |
43 | return 0; | |
44 | } | |
45 | EXPORT_SYMBOL(fib_default_rule_add); | |
46 | ||
d8a566be PM |
47 | u32 fib_default_rule_pref(struct fib_rules_ops *ops) |
48 | { | |
49 | struct list_head *pos; | |
50 | struct fib_rule *rule; | |
51 | ||
52 | if (!list_empty(&ops->rules_list)) { | |
53 | pos = ops->rules_list.next; | |
54 | if (pos->next != &ops->rules_list) { | |
55 | rule = list_entry(pos->next, struct fib_rule, list); | |
56 | if (rule->pref) | |
57 | return rule->pref - 1; | |
58 | } | |
59 | } | |
60 | ||
61 | return 0; | |
62 | } | |
63 | EXPORT_SYMBOL(fib_default_rule_pref); | |
64 | ||
9e3a5487 | 65 | static void notify_rule_change(int event, struct fib_rule *rule, |
c17084d2 TG |
66 | struct fib_rules_ops *ops, struct nlmsghdr *nlh, |
67 | u32 pid); | |
14c0b97d | 68 | |
5fd30ee7 | 69 | static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family) |
14c0b97d TG |
70 | { |
71 | struct fib_rules_ops *ops; | |
72 | ||
73 | rcu_read_lock(); | |
5fd30ee7 | 74 | list_for_each_entry_rcu(ops, &net->rules_ops, list) { |
14c0b97d TG |
75 | if (ops->family == family) { |
76 | if (!try_module_get(ops->owner)) | |
77 | ops = NULL; | |
78 | rcu_read_unlock(); | |
79 | return ops; | |
80 | } | |
81 | } | |
82 | rcu_read_unlock(); | |
83 | ||
84 | return NULL; | |
85 | } | |
86 | ||
87 | static void rules_ops_put(struct fib_rules_ops *ops) | |
88 | { | |
89 | if (ops) | |
90 | module_put(ops->owner); | |
91 | } | |
92 | ||
73417f61 TG |
93 | static void flush_route_cache(struct fib_rules_ops *ops) |
94 | { | |
95 | if (ops->flush_cache) | |
ae299fc0 | 96 | ops->flush_cache(ops); |
73417f61 TG |
97 | } |
98 | ||
e9c5158a | 99 | static int __fib_rules_register(struct fib_rules_ops *ops) |
14c0b97d TG |
100 | { |
101 | int err = -EEXIST; | |
102 | struct fib_rules_ops *o; | |
9e3a5487 DL |
103 | struct net *net; |
104 | ||
105 | net = ops->fro_net; | |
14c0b97d TG |
106 | |
107 | if (ops->rule_size < sizeof(struct fib_rule)) | |
108 | return -EINVAL; | |
109 | ||
110 | if (ops->match == NULL || ops->configure == NULL || | |
111 | ops->compare == NULL || ops->fill == NULL || | |
112 | ops->action == NULL) | |
113 | return -EINVAL; | |
114 | ||
5fd30ee7 DL |
115 | spin_lock(&net->rules_mod_lock); |
116 | list_for_each_entry(o, &net->rules_ops, list) | |
14c0b97d TG |
117 | if (ops->family == o->family) |
118 | goto errout; | |
119 | ||
5fd30ee7 | 120 | list_add_tail_rcu(&ops->list, &net->rules_ops); |
14c0b97d TG |
121 | err = 0; |
122 | errout: | |
5fd30ee7 | 123 | spin_unlock(&net->rules_mod_lock); |
14c0b97d TG |
124 | |
125 | return err; | |
126 | } | |
127 | ||
e9c5158a | 128 | struct fib_rules_ops * |
3d0c9c4e | 129 | fib_rules_register(const struct fib_rules_ops *tmpl, struct net *net) |
e9c5158a EB |
130 | { |
131 | struct fib_rules_ops *ops; | |
132 | int err; | |
133 | ||
2fb3573d | 134 | ops = kmemdup(tmpl, sizeof(*ops), GFP_KERNEL); |
e9c5158a EB |
135 | if (ops == NULL) |
136 | return ERR_PTR(-ENOMEM); | |
137 | ||
138 | INIT_LIST_HEAD(&ops->rules_list); | |
139 | ops->fro_net = net; | |
140 | ||
141 | err = __fib_rules_register(ops); | |
142 | if (err) { | |
143 | kfree(ops); | |
144 | ops = ERR_PTR(err); | |
145 | } | |
146 | ||
147 | return ops; | |
148 | } | |
14c0b97d TG |
149 | EXPORT_SYMBOL_GPL(fib_rules_register); |
150 | ||
1df9916e | 151 | static void fib_rules_cleanup_ops(struct fib_rules_ops *ops) |
14c0b97d TG |
152 | { |
153 | struct fib_rule *rule, *tmp; | |
154 | ||
76c72d4f | 155 | list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) { |
14c0b97d | 156 | list_del_rcu(&rule->list); |
7a9bc9b8 DM |
157 | if (ops->delete) |
158 | ops->delete(rule); | |
14c0b97d TG |
159 | fib_rule_put(rule); |
160 | } | |
161 | } | |
162 | ||
9e3a5487 | 163 | void fib_rules_unregister(struct fib_rules_ops *ops) |
14c0b97d | 164 | { |
9e3a5487 | 165 | struct net *net = ops->fro_net; |
14c0b97d | 166 | |
5fd30ee7 | 167 | spin_lock(&net->rules_mod_lock); |
72132c1b | 168 | list_del_rcu(&ops->list); |
5fd30ee7 | 169 | spin_unlock(&net->rules_mod_lock); |
14c0b97d | 170 | |
419df12f | 171 | fib_rules_cleanup_ops(ops); |
efd7ef1c | 172 | kfree_rcu(ops, rcu); |
14c0b97d | 173 | } |
14c0b97d TG |
174 | EXPORT_SYMBOL_GPL(fib_rules_unregister); |
175 | ||
3dfbcc41 TG |
176 | static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops, |
177 | struct flowi *fl, int flags) | |
178 | { | |
179 | int ret = 0; | |
180 | ||
1d28f42c | 181 | if (rule->iifindex && (rule->iifindex != fl->flowi_iif)) |
3dfbcc41 TG |
182 | goto out; |
183 | ||
1d28f42c | 184 | if (rule->oifindex && (rule->oifindex != fl->flowi_oif)) |
1b038a5e PM |
185 | goto out; |
186 | ||
1d28f42c | 187 | if ((rule->mark ^ fl->flowi_mark) & rule->mark_mask) |
3dfbcc41 TG |
188 | goto out; |
189 | ||
e7030878 TG |
190 | if (rule->tun_id && (rule->tun_id != fl->flowi_tun_key.tun_id)) |
191 | goto out; | |
192 | ||
3dfbcc41 TG |
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 | ||
7764a45a ST |
226 | if (!err && ops->suppress && ops->suppress(rule, arg)) |
227 | continue; | |
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 | ||
661d2967 | 269 | static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh) |
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 | } | |
efd7ef1c | 300 | rule->fr_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 | ||
e7030878 TG |
337 | if (tb[FRA_TUN_ID]) |
338 | rule->tun_id = nla_get_be64(tb[FRA_TUN_ID]); | |
339 | ||
14c0b97d TG |
340 | rule->action = frh->action; |
341 | rule->flags = frh->flags; | |
9e762a4a | 342 | rule->table = frh_get_table(frh, tb); |
73f5698e ST |
343 | if (tb[FRA_SUPPRESS_PREFIXLEN]) |
344 | rule->suppress_prefixlen = nla_get_u32(tb[FRA_SUPPRESS_PREFIXLEN]); | |
345 | else | |
346 | rule->suppress_prefixlen = -1; | |
14c0b97d | 347 | |
6ef94cfa ST |
348 | if (tb[FRA_SUPPRESS_IFGROUP]) |
349 | rule->suppress_ifgroup = nla_get_u32(tb[FRA_SUPPRESS_IFGROUP]); | |
73f5698e ST |
350 | else |
351 | rule->suppress_ifgroup = -1; | |
6ef94cfa | 352 | |
5adef180 | 353 | if (!tb[FRA_PRIORITY] && ops->default_pref) |
868d13ac | 354 | rule->pref = ops->default_pref(ops); |
14c0b97d | 355 | |
0947c9fe TG |
356 | err = -EINVAL; |
357 | if (tb[FRA_GOTO]) { | |
358 | if (rule->action != FR_ACT_GOTO) | |
359 | goto errout_free; | |
360 | ||
361 | rule->target = nla_get_u32(tb[FRA_GOTO]); | |
362 | /* Backward jumps are prohibited to avoid endless loops */ | |
363 | if (rule->target <= rule->pref) | |
364 | goto errout_free; | |
365 | ||
76c72d4f | 366 | list_for_each_entry(r, &ops->rules_list, list) { |
0947c9fe | 367 | if (r->pref == rule->target) { |
7a2b03c5 | 368 | RCU_INIT_POINTER(rule->ctarget, r); |
0947c9fe TG |
369 | break; |
370 | } | |
371 | } | |
372 | ||
7a2b03c5 | 373 | if (rcu_dereference_protected(rule->ctarget, 1) == NULL) |
0947c9fe TG |
374 | unresolved = 1; |
375 | } else if (rule->action == FR_ACT_GOTO) | |
376 | goto errout_free; | |
377 | ||
8b3521ee | 378 | err = ops->configure(rule, skb, frh, tb); |
14c0b97d TG |
379 | if (err < 0) |
380 | goto errout_free; | |
381 | ||
76c72d4f | 382 | list_for_each_entry(r, &ops->rules_list, list) { |
14c0b97d TG |
383 | if (r->pref > rule->pref) |
384 | break; | |
385 | last = r; | |
386 | } | |
387 | ||
388 | fib_rule_get(rule); | |
389 | ||
ebb9fed2 ED |
390 | if (last) |
391 | list_add_rcu(&rule->list, &last->list); | |
392 | else | |
393 | list_add_rcu(&rule->list, &ops->rules_list); | |
394 | ||
0947c9fe TG |
395 | if (ops->unresolved_rules) { |
396 | /* | |
397 | * There are unresolved goto rules in the list, check if | |
398 | * any of them are pointing to this new rule. | |
399 | */ | |
76c72d4f | 400 | list_for_each_entry(r, &ops->rules_list, list) { |
0947c9fe | 401 | if (r->action == FR_ACT_GOTO && |
561dac2d G |
402 | r->target == rule->pref && |
403 | rtnl_dereference(r->ctarget) == NULL) { | |
0947c9fe TG |
404 | rcu_assign_pointer(r->ctarget, rule); |
405 | if (--ops->unresolved_rules == 0) | |
406 | break; | |
407 | } | |
408 | } | |
409 | } | |
410 | ||
411 | if (rule->action == FR_ACT_GOTO) | |
412 | ops->nr_goto_rules++; | |
413 | ||
414 | if (unresolved) | |
415 | ops->unresolved_rules++; | |
416 | ||
e7030878 TG |
417 | if (rule->tun_id) |
418 | ip_tunnel_need_metadata(); | |
419 | ||
15e47304 | 420 | notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).portid); |
73417f61 | 421 | flush_route_cache(ops); |
14c0b97d TG |
422 | rules_ops_put(ops); |
423 | return 0; | |
424 | ||
425 | errout_free: | |
426 | kfree(rule); | |
427 | errout: | |
428 | rules_ops_put(ops); | |
429 | return err; | |
430 | } | |
431 | ||
661d2967 | 432 | static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh) |
14c0b97d | 433 | { |
3b1e0a65 | 434 | struct net *net = sock_net(skb->sk); |
14c0b97d TG |
435 | struct fib_rule_hdr *frh = nlmsg_data(nlh); |
436 | struct fib_rules_ops *ops = NULL; | |
0947c9fe | 437 | struct fib_rule *rule, *tmp; |
14c0b97d TG |
438 | struct nlattr *tb[FRA_MAX+1]; |
439 | int err = -EINVAL; | |
440 | ||
441 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) | |
442 | goto errout; | |
443 | ||
5fd30ee7 | 444 | ops = lookup_rules_ops(net, frh->family); |
14c0b97d | 445 | if (ops == NULL) { |
2fe195cf | 446 | err = -EAFNOSUPPORT; |
14c0b97d TG |
447 | goto errout; |
448 | } | |
449 | ||
450 | err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy); | |
451 | if (err < 0) | |
452 | goto errout; | |
453 | ||
e1701c68 TG |
454 | err = validate_rulemsg(frh, tb, ops); |
455 | if (err < 0) | |
456 | goto errout; | |
457 | ||
76c72d4f | 458 | list_for_each_entry(rule, &ops->rules_list, list) { |
14c0b97d TG |
459 | if (frh->action && (frh->action != rule->action)) |
460 | continue; | |
461 | ||
13eb2ab2 AH |
462 | if (frh_get_table(frh, tb) && |
463 | (frh_get_table(frh, tb) != rule->table)) | |
14c0b97d TG |
464 | continue; |
465 | ||
466 | if (tb[FRA_PRIORITY] && | |
467 | (rule->pref != nla_get_u32(tb[FRA_PRIORITY]))) | |
468 | continue; | |
469 | ||
491deb24 PM |
470 | if (tb[FRA_IIFNAME] && |
471 | nla_strcmp(tb[FRA_IIFNAME], rule->iifname)) | |
14c0b97d TG |
472 | continue; |
473 | ||
1b038a5e PM |
474 | if (tb[FRA_OIFNAME] && |
475 | nla_strcmp(tb[FRA_OIFNAME], rule->oifname)) | |
476 | continue; | |
477 | ||
b8964ed9 TG |
478 | if (tb[FRA_FWMARK] && |
479 | (rule->mark != nla_get_u32(tb[FRA_FWMARK]))) | |
480 | continue; | |
481 | ||
482 | if (tb[FRA_FWMASK] && | |
483 | (rule->mark_mask != nla_get_u32(tb[FRA_FWMASK]))) | |
484 | continue; | |
485 | ||
e7030878 TG |
486 | if (tb[FRA_TUN_ID] && |
487 | (rule->tun_id != nla_get_be64(tb[FRA_TUN_ID]))) | |
488 | continue; | |
489 | ||
14c0b97d TG |
490 | if (!ops->compare(rule, frh, tb)) |
491 | continue; | |
492 | ||
493 | if (rule->flags & FIB_RULE_PERMANENT) { | |
494 | err = -EPERM; | |
495 | goto errout; | |
496 | } | |
497 | ||
0ddcf43d AD |
498 | if (ops->delete) { |
499 | err = ops->delete(rule); | |
500 | if (err) | |
501 | goto errout; | |
502 | } | |
503 | ||
e7030878 TG |
504 | if (rule->tun_id) |
505 | ip_tunnel_unneed_metadata(); | |
506 | ||
14c0b97d | 507 | list_del_rcu(&rule->list); |
0947c9fe | 508 | |
afaef734 | 509 | if (rule->action == FR_ACT_GOTO) { |
0947c9fe | 510 | ops->nr_goto_rules--; |
afaef734 YZ |
511 | if (rtnl_dereference(rule->ctarget) == NULL) |
512 | ops->unresolved_rules--; | |
513 | } | |
0947c9fe TG |
514 | |
515 | /* | |
516 | * Check if this rule is a target to any of them. If so, | |
517 | * disable them. As this operation is eventually very | |
518 | * expensive, it is only performed if goto rules have | |
519 | * actually been added. | |
520 | */ | |
521 | if (ops->nr_goto_rules > 0) { | |
76c72d4f | 522 | list_for_each_entry(tmp, &ops->rules_list, list) { |
7a2b03c5 | 523 | if (rtnl_dereference(tmp->ctarget) == rule) { |
a9b3cd7f | 524 | RCU_INIT_POINTER(tmp->ctarget, NULL); |
0947c9fe TG |
525 | ops->unresolved_rules++; |
526 | } | |
527 | } | |
528 | } | |
529 | ||
9e3a5487 | 530 | notify_rule_change(RTM_DELRULE, rule, ops, nlh, |
15e47304 | 531 | NETLINK_CB(skb).portid); |
14c0b97d | 532 | fib_rule_put(rule); |
73417f61 | 533 | flush_route_cache(ops); |
14c0b97d TG |
534 | rules_ops_put(ops); |
535 | return 0; | |
536 | } | |
537 | ||
538 | err = -ENOENT; | |
539 | errout: | |
540 | rules_ops_put(ops); | |
541 | return err; | |
542 | } | |
543 | ||
339bf98f TG |
544 | static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops, |
545 | struct fib_rule *rule) | |
546 | { | |
547 | size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)) | |
491deb24 | 548 | + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */ |
1b038a5e | 549 | + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */ |
339bf98f TG |
550 | + nla_total_size(4) /* FRA_PRIORITY */ |
551 | + nla_total_size(4) /* FRA_TABLE */ | |
73f5698e | 552 | + nla_total_size(4) /* FRA_SUPPRESS_PREFIXLEN */ |
6ef94cfa | 553 | + nla_total_size(4) /* FRA_SUPPRESS_IFGROUP */ |
339bf98f | 554 | + nla_total_size(4) /* FRA_FWMARK */ |
e7030878 TG |
555 | + nla_total_size(4) /* FRA_FWMASK */ |
556 | + nla_total_size(8); /* FRA_TUN_ID */ | |
339bf98f TG |
557 | |
558 | if (ops->nlmsg_payload) | |
559 | payload += ops->nlmsg_payload(rule); | |
560 | ||
561 | return payload; | |
562 | } | |
563 | ||
14c0b97d TG |
564 | static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule, |
565 | u32 pid, u32 seq, int type, int flags, | |
566 | struct fib_rules_ops *ops) | |
567 | { | |
568 | struct nlmsghdr *nlh; | |
569 | struct fib_rule_hdr *frh; | |
570 | ||
571 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags); | |
572 | if (nlh == NULL) | |
26932566 | 573 | return -EMSGSIZE; |
14c0b97d TG |
574 | |
575 | frh = nlmsg_data(nlh); | |
28bb1726 | 576 | frh->family = ops->family; |
14c0b97d | 577 | frh->table = rule->table; |
0e3cea7b DM |
578 | if (nla_put_u32(skb, FRA_TABLE, rule->table)) |
579 | goto nla_put_failure; | |
73f5698e | 580 | if (nla_put_u32(skb, FRA_SUPPRESS_PREFIXLEN, rule->suppress_prefixlen)) |
7764a45a | 581 | goto nla_put_failure; |
14c0b97d TG |
582 | frh->res1 = 0; |
583 | frh->res2 = 0; | |
584 | frh->action = rule->action; | |
585 | frh->flags = rule->flags; | |
586 | ||
7a2b03c5 | 587 | if (rule->action == FR_ACT_GOTO && |
33d480ce | 588 | rcu_access_pointer(rule->ctarget) == NULL) |
0947c9fe TG |
589 | frh->flags |= FIB_RULE_UNRESOLVED; |
590 | ||
491deb24 | 591 | if (rule->iifname[0]) { |
0e3cea7b DM |
592 | if (nla_put_string(skb, FRA_IIFNAME, rule->iifname)) |
593 | goto nla_put_failure; | |
491deb24 PM |
594 | if (rule->iifindex == -1) |
595 | frh->flags |= FIB_RULE_IIF_DETACHED; | |
2b443683 TG |
596 | } |
597 | ||
1b038a5e | 598 | if (rule->oifname[0]) { |
0e3cea7b DM |
599 | if (nla_put_string(skb, FRA_OIFNAME, rule->oifname)) |
600 | goto nla_put_failure; | |
1b038a5e PM |
601 | if (rule->oifindex == -1) |
602 | frh->flags |= FIB_RULE_OIF_DETACHED; | |
603 | } | |
604 | ||
0e3cea7b DM |
605 | if ((rule->pref && |
606 | nla_put_u32(skb, FRA_PRIORITY, rule->pref)) || | |
607 | (rule->mark && | |
608 | nla_put_u32(skb, FRA_FWMARK, rule->mark)) || | |
609 | ((rule->mark_mask || rule->mark) && | |
610 | nla_put_u32(skb, FRA_FWMASK, rule->mark_mask)) || | |
611 | (rule->target && | |
e7030878 TG |
612 | nla_put_u32(skb, FRA_GOTO, rule->target)) || |
613 | (rule->tun_id && | |
614 | nla_put_be64(skb, FRA_TUN_ID, rule->tun_id))) | |
0e3cea7b | 615 | goto nla_put_failure; |
6ef94cfa ST |
616 | |
617 | if (rule->suppress_ifgroup != -1) { | |
618 | if (nla_put_u32(skb, FRA_SUPPRESS_IFGROUP, rule->suppress_ifgroup)) | |
619 | goto nla_put_failure; | |
620 | } | |
621 | ||
04af8cf6 | 622 | if (ops->fill(rule, skb, frh) < 0) |
14c0b97d TG |
623 | goto nla_put_failure; |
624 | ||
053c095a JB |
625 | nlmsg_end(skb, nlh); |
626 | return 0; | |
14c0b97d TG |
627 | |
628 | nla_put_failure: | |
26932566 PM |
629 | nlmsg_cancel(skb, nlh); |
630 | return -EMSGSIZE; | |
14c0b97d TG |
631 | } |
632 | ||
c454673d TG |
633 | static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb, |
634 | struct fib_rules_ops *ops) | |
14c0b97d TG |
635 | { |
636 | int idx = 0; | |
637 | struct fib_rule *rule; | |
14c0b97d | 638 | |
e67f88dd ED |
639 | rcu_read_lock(); |
640 | list_for_each_entry_rcu(rule, &ops->rules_list, list) { | |
c454673d | 641 | if (idx < cb->args[1]) |
14c0b97d TG |
642 | goto skip; |
643 | ||
15e47304 | 644 | if (fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).portid, |
14c0b97d TG |
645 | cb->nlh->nlmsg_seq, RTM_NEWRULE, |
646 | NLM_F_MULTI, ops) < 0) | |
647 | break; | |
648 | skip: | |
649 | idx++; | |
650 | } | |
2907c35f | 651 | rcu_read_unlock(); |
c454673d | 652 | cb->args[1] = idx; |
14c0b97d TG |
653 | rules_ops_put(ops); |
654 | ||
655 | return skb->len; | |
656 | } | |
657 | ||
c454673d TG |
658 | static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb) |
659 | { | |
3b1e0a65 | 660 | struct net *net = sock_net(skb->sk); |
c454673d TG |
661 | struct fib_rules_ops *ops; |
662 | int idx = 0, family; | |
663 | ||
664 | family = rtnl_msg_family(cb->nlh); | |
665 | if (family != AF_UNSPEC) { | |
666 | /* Protocol specific dump request */ | |
5fd30ee7 | 667 | ops = lookup_rules_ops(net, family); |
c454673d TG |
668 | if (ops == NULL) |
669 | return -EAFNOSUPPORT; | |
670 | ||
671 | return dump_rules(skb, cb, ops); | |
672 | } | |
673 | ||
674 | rcu_read_lock(); | |
5fd30ee7 | 675 | list_for_each_entry_rcu(ops, &net->rules_ops, list) { |
c454673d TG |
676 | if (idx < cb->args[0] || !try_module_get(ops->owner)) |
677 | goto skip; | |
678 | ||
679 | if (dump_rules(skb, cb, ops) < 0) | |
680 | break; | |
681 | ||
682 | cb->args[1] = 0; | |
2fb3573d | 683 | skip: |
c454673d TG |
684 | idx++; |
685 | } | |
686 | rcu_read_unlock(); | |
687 | cb->args[0] = idx; | |
688 | ||
689 | return skb->len; | |
690 | } | |
14c0b97d | 691 | |
9e3a5487 | 692 | static void notify_rule_change(int event, struct fib_rule *rule, |
c17084d2 TG |
693 | struct fib_rules_ops *ops, struct nlmsghdr *nlh, |
694 | u32 pid) | |
14c0b97d | 695 | { |
9e3a5487 | 696 | struct net *net; |
c17084d2 TG |
697 | struct sk_buff *skb; |
698 | int err = -ENOBUFS; | |
14c0b97d | 699 | |
9e3a5487 | 700 | net = ops->fro_net; |
339bf98f | 701 | skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL); |
14c0b97d | 702 | if (skb == NULL) |
c17084d2 TG |
703 | goto errout; |
704 | ||
705 | err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops); | |
26932566 PM |
706 | if (err < 0) { |
707 | /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */ | |
708 | WARN_ON(err == -EMSGSIZE); | |
709 | kfree_skb(skb); | |
710 | goto errout; | |
711 | } | |
9e3a5487 | 712 | |
1ce85fe4 PNA |
713 | rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL); |
714 | return; | |
c17084d2 TG |
715 | errout: |
716 | if (err < 0) | |
5fd30ee7 | 717 | rtnl_set_sk_err(net, ops->nlgroup, err); |
14c0b97d TG |
718 | } |
719 | ||
720 | static void attach_rules(struct list_head *rules, struct net_device *dev) | |
721 | { | |
722 | struct fib_rule *rule; | |
723 | ||
724 | list_for_each_entry(rule, rules, list) { | |
491deb24 PM |
725 | if (rule->iifindex == -1 && |
726 | strcmp(dev->name, rule->iifname) == 0) | |
727 | rule->iifindex = dev->ifindex; | |
1b038a5e PM |
728 | if (rule->oifindex == -1 && |
729 | strcmp(dev->name, rule->oifname) == 0) | |
730 | rule->oifindex = dev->ifindex; | |
14c0b97d TG |
731 | } |
732 | } | |
733 | ||
734 | static void detach_rules(struct list_head *rules, struct net_device *dev) | |
735 | { | |
736 | struct fib_rule *rule; | |
737 | ||
1b038a5e | 738 | list_for_each_entry(rule, rules, list) { |
491deb24 PM |
739 | if (rule->iifindex == dev->ifindex) |
740 | rule->iifindex = -1; | |
1b038a5e PM |
741 | if (rule->oifindex == dev->ifindex) |
742 | rule->oifindex = -1; | |
743 | } | |
14c0b97d TG |
744 | } |
745 | ||
746 | ||
747 | static int fib_rules_event(struct notifier_block *this, unsigned long event, | |
351638e7 | 748 | void *ptr) |
14c0b97d | 749 | { |
351638e7 | 750 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 751 | struct net *net = dev_net(dev); |
14c0b97d TG |
752 | struct fib_rules_ops *ops; |
753 | ||
748e2d93 | 754 | ASSERT_RTNL(); |
14c0b97d TG |
755 | |
756 | switch (event) { | |
757 | case NETDEV_REGISTER: | |
5fd30ee7 | 758 | list_for_each_entry(ops, &net->rules_ops, list) |
76c72d4f | 759 | attach_rules(&ops->rules_list, dev); |
14c0b97d TG |
760 | break; |
761 | ||
946c032e MŻ |
762 | case NETDEV_CHANGENAME: |
763 | list_for_each_entry(ops, &net->rules_ops, list) { | |
764 | detach_rules(&ops->rules_list, dev); | |
765 | attach_rules(&ops->rules_list, dev); | |
766 | } | |
767 | break; | |
768 | ||
14c0b97d | 769 | case NETDEV_UNREGISTER: |
5fd30ee7 | 770 | list_for_each_entry(ops, &net->rules_ops, list) |
76c72d4f | 771 | detach_rules(&ops->rules_list, dev); |
14c0b97d TG |
772 | break; |
773 | } | |
774 | ||
14c0b97d TG |
775 | return NOTIFY_DONE; |
776 | } | |
777 | ||
778 | static struct notifier_block fib_rules_notifier = { | |
779 | .notifier_call = fib_rules_event, | |
780 | }; | |
781 | ||
2c8c1e72 | 782 | static int __net_init fib_rules_net_init(struct net *net) |
5fd30ee7 DL |
783 | { |
784 | INIT_LIST_HEAD(&net->rules_ops); | |
785 | spin_lock_init(&net->rules_mod_lock); | |
786 | return 0; | |
787 | } | |
788 | ||
789 | static struct pernet_operations fib_rules_net_ops = { | |
790 | .init = fib_rules_net_init, | |
791 | }; | |
792 | ||
14c0b97d TG |
793 | static int __init fib_rules_init(void) |
794 | { | |
5fd30ee7 | 795 | int err; |
c7ac8679 GR |
796 | rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL, NULL); |
797 | rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL, NULL); | |
798 | rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule, NULL); | |
9d9e6a58 | 799 | |
5d6d4809 | 800 | err = register_pernet_subsys(&fib_rules_net_ops); |
5fd30ee7 DL |
801 | if (err < 0) |
802 | goto fail; | |
803 | ||
5d6d4809 | 804 | err = register_netdevice_notifier(&fib_rules_notifier); |
5fd30ee7 DL |
805 | if (err < 0) |
806 | goto fail_unregister; | |
5d6d4809 | 807 | |
5fd30ee7 DL |
808 | return 0; |
809 | ||
810 | fail_unregister: | |
5d6d4809 | 811 | unregister_pernet_subsys(&fib_rules_net_ops); |
5fd30ee7 DL |
812 | fail: |
813 | rtnl_unregister(PF_UNSPEC, RTM_NEWRULE); | |
814 | rtnl_unregister(PF_UNSPEC, RTM_DELRULE); | |
815 | rtnl_unregister(PF_UNSPEC, RTM_GETRULE); | |
816 | return err; | |
14c0b97d TG |
817 | } |
818 | ||
819 | subsys_initcall(fib_rules_init); |