Commit | Line | Data |
---|---|---|
a10e763b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
14c0b97d TG |
2 | /* |
3 | * net/core/fib_rules.c Generic Routing Rules | |
4 | * | |
14c0b97d TG |
5 | * Authors: Thomas Graf <tgraf@suug.ch> |
6 | */ | |
7 | ||
14c0b97d TG |
8 | #include <linux/types.h> |
9 | #include <linux/kernel.h> | |
5a0e3ad6 | 10 | #include <linux/slab.h> |
14c0b97d | 11 | #include <linux/list.h> |
3a9a231d | 12 | #include <linux/module.h> |
e9dc8653 | 13 | #include <net/net_namespace.h> |
881d966b | 14 | #include <net/sock.h> |
14c0b97d | 15 | #include <net/fib_rules.h> |
e7030878 | 16 | #include <net/ip_tunnels.h> |
14c0b97d | 17 | |
622ec2c9 LC |
18 | static const struct fib_kuid_range fib_kuid_range_unset = { |
19 | KUIDT_INIT(0), | |
20 | KUIDT_INIT(~0), | |
21 | }; | |
22 | ||
3c71006d IS |
23 | bool fib_rule_matchall(const struct fib_rule *rule) |
24 | { | |
25 | if (rule->iifindex || rule->oifindex || rule->mark || rule->tun_id || | |
26 | rule->flags) | |
27 | return false; | |
28 | if (rule->suppress_ifgroup != -1 || rule->suppress_prefixlen != -1) | |
29 | return false; | |
30 | if (!uid_eq(rule->uid_range.start, fib_kuid_range_unset.start) || | |
31 | !uid_eq(rule->uid_range.end, fib_kuid_range_unset.end)) | |
32 | return false; | |
bfff4862 RP |
33 | if (fib_rule_port_range_set(&rule->sport_range)) |
34 | return false; | |
35 | if (fib_rule_port_range_set(&rule->dport_range)) | |
36 | return false; | |
3c71006d IS |
37 | return true; |
38 | } | |
39 | EXPORT_SYMBOL_GPL(fib_rule_matchall); | |
40 | ||
2994c638 DL |
41 | int fib_default_rule_add(struct fib_rules_ops *ops, |
42 | u32 pref, u32 table, u32 flags) | |
43 | { | |
44 | struct fib_rule *r; | |
45 | ||
46 | r = kzalloc(ops->rule_size, GFP_KERNEL); | |
47 | if (r == NULL) | |
48 | return -ENOMEM; | |
49 | ||
717d1e99 | 50 | refcount_set(&r->refcnt, 1); |
2994c638 DL |
51 | r->action = FR_ACT_TO_TBL; |
52 | r->pref = pref; | |
53 | r->table = table; | |
54 | r->flags = flags; | |
cac56209 | 55 | r->proto = RTPROT_KERNEL; |
efd7ef1c | 56 | r->fr_net = ops->fro_net; |
622ec2c9 | 57 | r->uid_range = fib_kuid_range_unset; |
2994c638 | 58 | |
73f5698e ST |
59 | r->suppress_prefixlen = -1; |
60 | r->suppress_ifgroup = -1; | |
61 | ||
2994c638 DL |
62 | /* The lock is not required here, the list in unreacheable |
63 | * at the moment this function is called */ | |
64 | list_add_tail(&r->list, &ops->rules_list); | |
65 | return 0; | |
66 | } | |
67 | EXPORT_SYMBOL(fib_default_rule_add); | |
68 | ||
f53de1e9 | 69 | static u32 fib_default_rule_pref(struct fib_rules_ops *ops) |
d8a566be PM |
70 | { |
71 | struct list_head *pos; | |
72 | struct fib_rule *rule; | |
73 | ||
74 | if (!list_empty(&ops->rules_list)) { | |
75 | pos = ops->rules_list.next; | |
76 | if (pos->next != &ops->rules_list) { | |
77 | rule = list_entry(pos->next, struct fib_rule, list); | |
78 | if (rule->pref) | |
79 | return rule->pref - 1; | |
80 | } | |
81 | } | |
82 | ||
83 | return 0; | |
84 | } | |
d8a566be | 85 | |
9e3a5487 | 86 | static void notify_rule_change(int event, struct fib_rule *rule, |
c17084d2 TG |
87 | struct fib_rules_ops *ops, struct nlmsghdr *nlh, |
88 | u32 pid); | |
14c0b97d | 89 | |
5fd30ee7 | 90 | static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family) |
14c0b97d TG |
91 | { |
92 | struct fib_rules_ops *ops; | |
93 | ||
94 | rcu_read_lock(); | |
5fd30ee7 | 95 | list_for_each_entry_rcu(ops, &net->rules_ops, list) { |
14c0b97d TG |
96 | if (ops->family == family) { |
97 | if (!try_module_get(ops->owner)) | |
98 | ops = NULL; | |
99 | rcu_read_unlock(); | |
100 | return ops; | |
101 | } | |
102 | } | |
103 | rcu_read_unlock(); | |
104 | ||
105 | return NULL; | |
106 | } | |
107 | ||
108 | static void rules_ops_put(struct fib_rules_ops *ops) | |
109 | { | |
110 | if (ops) | |
111 | module_put(ops->owner); | |
112 | } | |
113 | ||
73417f61 TG |
114 | static void flush_route_cache(struct fib_rules_ops *ops) |
115 | { | |
116 | if (ops->flush_cache) | |
ae299fc0 | 117 | ops->flush_cache(ops); |
73417f61 TG |
118 | } |
119 | ||
e9c5158a | 120 | static int __fib_rules_register(struct fib_rules_ops *ops) |
14c0b97d TG |
121 | { |
122 | int err = -EEXIST; | |
123 | struct fib_rules_ops *o; | |
9e3a5487 DL |
124 | struct net *net; |
125 | ||
126 | net = ops->fro_net; | |
14c0b97d TG |
127 | |
128 | if (ops->rule_size < sizeof(struct fib_rule)) | |
129 | return -EINVAL; | |
130 | ||
131 | if (ops->match == NULL || ops->configure == NULL || | |
132 | ops->compare == NULL || ops->fill == NULL || | |
133 | ops->action == NULL) | |
134 | return -EINVAL; | |
135 | ||
5fd30ee7 DL |
136 | spin_lock(&net->rules_mod_lock); |
137 | list_for_each_entry(o, &net->rules_ops, list) | |
14c0b97d TG |
138 | if (ops->family == o->family) |
139 | goto errout; | |
140 | ||
5fd30ee7 | 141 | list_add_tail_rcu(&ops->list, &net->rules_ops); |
14c0b97d TG |
142 | err = 0; |
143 | errout: | |
5fd30ee7 | 144 | spin_unlock(&net->rules_mod_lock); |
14c0b97d TG |
145 | |
146 | return err; | |
147 | } | |
148 | ||
e9c5158a | 149 | struct fib_rules_ops * |
3d0c9c4e | 150 | fib_rules_register(const struct fib_rules_ops *tmpl, struct net *net) |
e9c5158a EB |
151 | { |
152 | struct fib_rules_ops *ops; | |
153 | int err; | |
154 | ||
2fb3573d | 155 | ops = kmemdup(tmpl, sizeof(*ops), GFP_KERNEL); |
e9c5158a EB |
156 | if (ops == NULL) |
157 | return ERR_PTR(-ENOMEM); | |
158 | ||
159 | INIT_LIST_HEAD(&ops->rules_list); | |
160 | ops->fro_net = net; | |
161 | ||
162 | err = __fib_rules_register(ops); | |
163 | if (err) { | |
164 | kfree(ops); | |
165 | ops = ERR_PTR(err); | |
166 | } | |
167 | ||
168 | return ops; | |
169 | } | |
14c0b97d TG |
170 | EXPORT_SYMBOL_GPL(fib_rules_register); |
171 | ||
1df9916e | 172 | static void fib_rules_cleanup_ops(struct fib_rules_ops *ops) |
14c0b97d TG |
173 | { |
174 | struct fib_rule *rule, *tmp; | |
175 | ||
76c72d4f | 176 | list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) { |
14c0b97d | 177 | list_del_rcu(&rule->list); |
7a9bc9b8 DM |
178 | if (ops->delete) |
179 | ops->delete(rule); | |
14c0b97d TG |
180 | fib_rule_put(rule); |
181 | } | |
182 | } | |
183 | ||
9e3a5487 | 184 | void fib_rules_unregister(struct fib_rules_ops *ops) |
14c0b97d | 185 | { |
9e3a5487 | 186 | struct net *net = ops->fro_net; |
14c0b97d | 187 | |
5fd30ee7 | 188 | spin_lock(&net->rules_mod_lock); |
72132c1b | 189 | list_del_rcu(&ops->list); |
5fd30ee7 | 190 | spin_unlock(&net->rules_mod_lock); |
14c0b97d | 191 | |
419df12f | 192 | fib_rules_cleanup_ops(ops); |
efd7ef1c | 193 | kfree_rcu(ops, rcu); |
14c0b97d | 194 | } |
14c0b97d TG |
195 | EXPORT_SYMBOL_GPL(fib_rules_unregister); |
196 | ||
622ec2c9 LC |
197 | static int uid_range_set(struct fib_kuid_range *range) |
198 | { | |
199 | return uid_valid(range->start) && uid_valid(range->end); | |
200 | } | |
201 | ||
202 | static struct fib_kuid_range nla_get_kuid_range(struct nlattr **tb) | |
203 | { | |
204 | struct fib_rule_uid_range *in; | |
205 | struct fib_kuid_range out; | |
206 | ||
207 | in = (struct fib_rule_uid_range *)nla_data(tb[FRA_UID_RANGE]); | |
208 | ||
209 | out.start = make_kuid(current_user_ns(), in->start); | |
210 | out.end = make_kuid(current_user_ns(), in->end); | |
211 | ||
212 | return out; | |
213 | } | |
214 | ||
215 | static int nla_put_uid_range(struct sk_buff *skb, struct fib_kuid_range *range) | |
216 | { | |
217 | struct fib_rule_uid_range out = { | |
218 | from_kuid_munged(current_user_ns(), range->start), | |
219 | from_kuid_munged(current_user_ns(), range->end) | |
220 | }; | |
221 | ||
222 | return nla_put(skb, FRA_UID_RANGE, sizeof(out), &out); | |
223 | } | |
224 | ||
bfff4862 RP |
225 | static int nla_get_port_range(struct nlattr *pattr, |
226 | struct fib_rule_port_range *port_range) | |
227 | { | |
228 | const struct fib_rule_port_range *pr = nla_data(pattr); | |
229 | ||
230 | if (!fib_rule_port_range_valid(pr)) | |
231 | return -EINVAL; | |
232 | ||
233 | port_range->start = pr->start; | |
234 | port_range->end = pr->end; | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
239 | static int nla_put_port_range(struct sk_buff *skb, int attrtype, | |
240 | struct fib_rule_port_range *range) | |
241 | { | |
242 | return nla_put(skb, attrtype, sizeof(*range), range); | |
243 | } | |
244 | ||
3dfbcc41 | 245 | static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops, |
96c63fa7 DA |
246 | struct flowi *fl, int flags, |
247 | struct fib_lookup_arg *arg) | |
3dfbcc41 TG |
248 | { |
249 | int ret = 0; | |
250 | ||
1d28f42c | 251 | if (rule->iifindex && (rule->iifindex != fl->flowi_iif)) |
3dfbcc41 TG |
252 | goto out; |
253 | ||
1d28f42c | 254 | if (rule->oifindex && (rule->oifindex != fl->flowi_oif)) |
1b038a5e PM |
255 | goto out; |
256 | ||
1d28f42c | 257 | if ((rule->mark ^ fl->flowi_mark) & rule->mark_mask) |
3dfbcc41 TG |
258 | goto out; |
259 | ||
e7030878 TG |
260 | if (rule->tun_id && (rule->tun_id != fl->flowi_tun_key.tun_id)) |
261 | goto out; | |
262 | ||
96c63fa7 DA |
263 | if (rule->l3mdev && !l3mdev_fib_rule_match(rule->fr_net, fl, arg)) |
264 | goto out; | |
265 | ||
622ec2c9 LC |
266 | if (uid_lt(fl->flowi_uid, rule->uid_range.start) || |
267 | uid_gt(fl->flowi_uid, rule->uid_range.end)) | |
268 | goto out; | |
269 | ||
3dfbcc41 TG |
270 | ret = ops->match(rule, fl, flags); |
271 | out: | |
272 | return (rule->flags & FIB_RULE_INVERT) ? !ret : ret; | |
273 | } | |
274 | ||
14c0b97d TG |
275 | int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl, |
276 | int flags, struct fib_lookup_arg *arg) | |
277 | { | |
278 | struct fib_rule *rule; | |
279 | int err; | |
280 | ||
281 | rcu_read_lock(); | |
282 | ||
76c72d4f | 283 | list_for_each_entry_rcu(rule, &ops->rules_list, list) { |
0947c9fe | 284 | jumped: |
96c63fa7 | 285 | if (!fib_rule_match(rule, ops, fl, flags, arg)) |
14c0b97d TG |
286 | continue; |
287 | ||
0947c9fe TG |
288 | if (rule->action == FR_ACT_GOTO) { |
289 | struct fib_rule *target; | |
290 | ||
291 | target = rcu_dereference(rule->ctarget); | |
292 | if (target == NULL) { | |
293 | continue; | |
294 | } else { | |
295 | rule = target; | |
296 | goto jumped; | |
297 | } | |
fa0b2d1d TG |
298 | } else if (rule->action == FR_ACT_NOP) |
299 | continue; | |
300 | else | |
0947c9fe TG |
301 | err = ops->action(rule, fl, flags, arg); |
302 | ||
7764a45a ST |
303 | if (!err && ops->suppress && ops->suppress(rule, arg)) |
304 | continue; | |
305 | ||
14c0b97d | 306 | if (err != -EAGAIN) { |
ebc0ffae | 307 | if ((arg->flags & FIB_LOOKUP_NOREF) || |
717d1e99 | 308 | likely(refcount_inc_not_zero(&rule->refcnt))) { |
7fa7cb71 ED |
309 | arg->rule = rule; |
310 | goto out; | |
311 | } | |
312 | break; | |
14c0b97d TG |
313 | } |
314 | } | |
315 | ||
83886b6b | 316 | err = -ESRCH; |
14c0b97d TG |
317 | out: |
318 | rcu_read_unlock(); | |
319 | ||
320 | return err; | |
321 | } | |
14c0b97d TG |
322 | EXPORT_SYMBOL_GPL(fib_rules_lookup); |
323 | ||
7c550daf | 324 | static int call_fib_rule_notifier(struct notifier_block *nb, |
1b2a4440 | 325 | enum fib_event_type event_type, |
b7a59557 JP |
326 | struct fib_rule *rule, int family, |
327 | struct netlink_ext_ack *extack) | |
1b2a4440 IS |
328 | { |
329 | struct fib_rule_notifier_info info = { | |
330 | .info.family = family, | |
b7a59557 | 331 | .info.extack = extack, |
1b2a4440 IS |
332 | .rule = rule, |
333 | }; | |
334 | ||
7c550daf | 335 | return call_fib_notifier(nb, event_type, &info.info); |
1b2a4440 IS |
336 | } |
337 | ||
338 | static int call_fib_rule_notifiers(struct net *net, | |
339 | enum fib_event_type event_type, | |
340 | struct fib_rule *rule, | |
6c31e5a9 DA |
341 | struct fib_rules_ops *ops, |
342 | struct netlink_ext_ack *extack) | |
1b2a4440 IS |
343 | { |
344 | struct fib_rule_notifier_info info = { | |
345 | .info.family = ops->family, | |
6c31e5a9 | 346 | .info.extack = extack, |
1b2a4440 IS |
347 | .rule = rule, |
348 | }; | |
349 | ||
350 | ops->fib_rules_seq++; | |
351 | return call_fib_notifiers(net, event_type, &info.info); | |
352 | } | |
353 | ||
354 | /* Called with rcu_read_lock() */ | |
b7a59557 JP |
355 | int fib_rules_dump(struct net *net, struct notifier_block *nb, int family, |
356 | struct netlink_ext_ack *extack) | |
1b2a4440 IS |
357 | { |
358 | struct fib_rules_ops *ops; | |
359 | struct fib_rule *rule; | |
55c894f7 | 360 | int err = 0; |
1b2a4440 IS |
361 | |
362 | ops = lookup_rules_ops(net, family); | |
363 | if (!ops) | |
364 | return -EAFNOSUPPORT; | |
55c894f7 JP |
365 | list_for_each_entry_rcu(rule, &ops->rules_list, list) { |
366 | err = call_fib_rule_notifier(nb, FIB_EVENT_RULE_ADD, | |
b7a59557 | 367 | rule, family, extack); |
55c894f7 JP |
368 | if (err) |
369 | break; | |
370 | } | |
1b2a4440 IS |
371 | rules_ops_put(ops); |
372 | ||
55c894f7 | 373 | return err; |
1b2a4440 IS |
374 | } |
375 | EXPORT_SYMBOL_GPL(fib_rules_dump); | |
376 | ||
377 | unsigned int fib_rules_seq_read(struct net *net, int family) | |
378 | { | |
379 | unsigned int fib_rules_seq; | |
380 | struct fib_rules_ops *ops; | |
381 | ||
382 | ASSERT_RTNL(); | |
383 | ||
384 | ops = lookup_rules_ops(net, family); | |
385 | if (!ops) | |
386 | return 0; | |
387 | fib_rules_seq = ops->fib_rules_seq; | |
388 | rules_ops_put(ops); | |
389 | ||
390 | return fib_rules_seq; | |
391 | } | |
392 | EXPORT_SYMBOL_GPL(fib_rules_seq_read); | |
393 | ||
f9d4b0c1 RP |
394 | static struct fib_rule *rule_find(struct fib_rules_ops *ops, |
395 | struct fib_rule_hdr *frh, | |
396 | struct nlattr **tb, | |
397 | struct fib_rule *rule, | |
398 | bool user_priority) | |
153380ec MB |
399 | { |
400 | struct fib_rule *r; | |
401 | ||
402 | list_for_each_entry(r, &ops->rules_list, list) { | |
f9d4b0c1 | 403 | if (rule->action && r->action != rule->action) |
153380ec MB |
404 | continue; |
405 | ||
f9d4b0c1 | 406 | if (rule->table && r->table != rule->table) |
153380ec MB |
407 | continue; |
408 | ||
f9d4b0c1 | 409 | if (user_priority && r->pref != rule->pref) |
153380ec MB |
410 | continue; |
411 | ||
f9d4b0c1 RP |
412 | if (rule->iifname[0] && |
413 | memcmp(r->iifname, rule->iifname, IFNAMSIZ)) | |
153380ec MB |
414 | continue; |
415 | ||
f9d4b0c1 RP |
416 | if (rule->oifname[0] && |
417 | memcmp(r->oifname, rule->oifname, IFNAMSIZ)) | |
153380ec MB |
418 | continue; |
419 | ||
f9d4b0c1 | 420 | if (rule->mark && r->mark != rule->mark) |
153380ec MB |
421 | continue; |
422 | ||
7c8f4e6d JD |
423 | if (rule->suppress_ifgroup != -1 && |
424 | r->suppress_ifgroup != rule->suppress_ifgroup) | |
425 | continue; | |
426 | ||
427 | if (rule->suppress_prefixlen != -1 && | |
428 | r->suppress_prefixlen != rule->suppress_prefixlen) | |
429 | continue; | |
430 | ||
f9d4b0c1 | 431 | if (rule->mark_mask && r->mark_mask != rule->mark_mask) |
153380ec MB |
432 | continue; |
433 | ||
f9d4b0c1 | 434 | if (rule->tun_id && r->tun_id != rule->tun_id) |
153380ec MB |
435 | continue; |
436 | ||
437 | if (r->fr_net != rule->fr_net) | |
438 | continue; | |
439 | ||
f9d4b0c1 | 440 | if (rule->l3mdev && r->l3mdev != rule->l3mdev) |
153380ec MB |
441 | continue; |
442 | ||
f9d4b0c1 RP |
443 | if (uid_range_set(&rule->uid_range) && |
444 | (!uid_eq(r->uid_range.start, rule->uid_range.start) || | |
445 | !uid_eq(r->uid_range.end, rule->uid_range.end))) | |
35b80733 LC |
446 | continue; |
447 | ||
f9d4b0c1 | 448 | if (rule->ip_proto && r->ip_proto != rule->ip_proto) |
bfff4862 RP |
449 | continue; |
450 | ||
35e8c7ba RP |
451 | if (rule->proto && r->proto != rule->proto) |
452 | continue; | |
453 | ||
f9d4b0c1 RP |
454 | if (fib_rule_port_range_set(&rule->sport_range) && |
455 | !fib_rule_port_range_compare(&r->sport_range, | |
bfff4862 RP |
456 | &rule->sport_range)) |
457 | continue; | |
458 | ||
f9d4b0c1 RP |
459 | if (fib_rule_port_range_set(&rule->dport_range) && |
460 | !fib_rule_port_range_compare(&r->dport_range, | |
bfff4862 RP |
461 | &rule->dport_range)) |
462 | continue; | |
463 | ||
153380ec MB |
464 | if (!ops->compare(r, frh, tb)) |
465 | continue; | |
f9d4b0c1 | 466 | return r; |
153380ec | 467 | } |
f9d4b0c1 RP |
468 | |
469 | return NULL; | |
153380ec MB |
470 | } |
471 | ||
c77bbc64 DA |
472 | #ifdef CONFIG_NET_L3_MASTER_DEV |
473 | static int fib_nl2rule_l3mdev(struct nlattr *nla, struct fib_rule *nlrule, | |
474 | struct netlink_ext_ack *extack) | |
475 | { | |
476 | nlrule->l3mdev = nla_get_u8(nla); | |
477 | if (nlrule->l3mdev != 1) { | |
478 | NL_SET_ERR_MSG(extack, "Invalid l3mdev attribute"); | |
479 | return -1; | |
480 | } | |
481 | ||
482 | return 0; | |
483 | } | |
484 | #else | |
485 | static int fib_nl2rule_l3mdev(struct nlattr *nla, struct fib_rule *nlrule, | |
486 | struct netlink_ext_ack *extack) | |
487 | { | |
488 | NL_SET_ERR_MSG(extack, "l3mdev support is not enabled in kernel"); | |
489 | return -1; | |
490 | } | |
491 | #endif | |
492 | ||
f9d4b0c1 RP |
493 | static int fib_nl2rule(struct sk_buff *skb, struct nlmsghdr *nlh, |
494 | struct netlink_ext_ack *extack, | |
495 | struct fib_rules_ops *ops, | |
496 | struct nlattr *tb[], | |
497 | struct fib_rule **rule, | |
498 | bool *user_priority) | |
14c0b97d | 499 | { |
3b1e0a65 | 500 | struct net *net = sock_net(skb->sk); |
14c0b97d | 501 | struct fib_rule_hdr *frh = nlmsg_data(nlh); |
f9d4b0c1 RP |
502 | struct fib_rule *nlrule = NULL; |
503 | int err = -EINVAL; | |
14c0b97d | 504 | |
f9d4b0c1 RP |
505 | if (frh->src_len) |
506 | if (!tb[FRA_SRC] || | |
507 | frh->src_len > (ops->addr_size * 8) || | |
b16fb418 RP |
508 | nla_len(tb[FRA_SRC]) != ops->addr_size) { |
509 | NL_SET_ERR_MSG(extack, "Invalid source address"); | |
f9d4b0c1 | 510 | goto errout; |
b16fb418 | 511 | } |
14c0b97d | 512 | |
f9d4b0c1 RP |
513 | if (frh->dst_len) |
514 | if (!tb[FRA_DST] || | |
515 | frh->dst_len > (ops->addr_size * 8) || | |
b16fb418 RP |
516 | nla_len(tb[FRA_DST]) != ops->addr_size) { |
517 | NL_SET_ERR_MSG(extack, "Invalid dst address"); | |
f9d4b0c1 | 518 | goto errout; |
b16fb418 | 519 | } |
e1701c68 | 520 | |
f9d4b0c1 RP |
521 | nlrule = kzalloc(ops->rule_size, GFP_KERNEL); |
522 | if (!nlrule) { | |
14c0b97d TG |
523 | err = -ENOMEM; |
524 | goto errout; | |
525 | } | |
f9d4b0c1 RP |
526 | refcount_set(&nlrule->refcnt, 1); |
527 | nlrule->fr_net = net; | |
14c0b97d | 528 | |
f9d4b0c1 RP |
529 | if (tb[FRA_PRIORITY]) { |
530 | nlrule->pref = nla_get_u32(tb[FRA_PRIORITY]); | |
531 | *user_priority = true; | |
532 | } else { | |
533 | nlrule->pref = fib_default_rule_pref(ops); | |
534 | } | |
14c0b97d | 535 | |
f9d4b0c1 | 536 | nlrule->proto = tb[FRA_PROTOCOL] ? |
1b71af60 DS |
537 | nla_get_u8(tb[FRA_PROTOCOL]) : RTPROT_UNSPEC; |
538 | ||
491deb24 | 539 | if (tb[FRA_IIFNAME]) { |
14c0b97d TG |
540 | struct net_device *dev; |
541 | ||
f9d4b0c1 RP |
542 | nlrule->iifindex = -1; |
543 | nla_strlcpy(nlrule->iifname, tb[FRA_IIFNAME], IFNAMSIZ); | |
544 | dev = __dev_get_by_name(net, nlrule->iifname); | |
14c0b97d | 545 | if (dev) |
f9d4b0c1 | 546 | nlrule->iifindex = dev->ifindex; |
14c0b97d TG |
547 | } |
548 | ||
1b038a5e PM |
549 | if (tb[FRA_OIFNAME]) { |
550 | struct net_device *dev; | |
551 | ||
f9d4b0c1 RP |
552 | nlrule->oifindex = -1; |
553 | nla_strlcpy(nlrule->oifname, tb[FRA_OIFNAME], IFNAMSIZ); | |
554 | dev = __dev_get_by_name(net, nlrule->oifname); | |
1b038a5e | 555 | if (dev) |
f9d4b0c1 | 556 | nlrule->oifindex = dev->ifindex; |
1b038a5e PM |
557 | } |
558 | ||
b8964ed9 | 559 | if (tb[FRA_FWMARK]) { |
f9d4b0c1 RP |
560 | nlrule->mark = nla_get_u32(tb[FRA_FWMARK]); |
561 | if (nlrule->mark) | |
b8964ed9 TG |
562 | /* compatibility: if the mark value is non-zero all bits |
563 | * are compared unless a mask is explicitly specified. | |
564 | */ | |
f9d4b0c1 | 565 | nlrule->mark_mask = 0xFFFFFFFF; |
b8964ed9 TG |
566 | } |
567 | ||
568 | if (tb[FRA_FWMASK]) | |
f9d4b0c1 | 569 | nlrule->mark_mask = nla_get_u32(tb[FRA_FWMASK]); |
b8964ed9 | 570 | |
e7030878 | 571 | if (tb[FRA_TUN_ID]) |
f9d4b0c1 | 572 | nlrule->tun_id = nla_get_be64(tb[FRA_TUN_ID]); |
e7030878 | 573 | |
adeb45cb | 574 | err = -EINVAL; |
c77bbc64 DA |
575 | if (tb[FRA_L3MDEV] && |
576 | fib_nl2rule_l3mdev(tb[FRA_L3MDEV], nlrule, extack) < 0) | |
577 | goto errout_free; | |
96c63fa7 | 578 | |
f9d4b0c1 RP |
579 | nlrule->action = frh->action; |
580 | nlrule->flags = frh->flags; | |
581 | nlrule->table = frh_get_table(frh, tb); | |
73f5698e | 582 | if (tb[FRA_SUPPRESS_PREFIXLEN]) |
f9d4b0c1 | 583 | nlrule->suppress_prefixlen = nla_get_u32(tb[FRA_SUPPRESS_PREFIXLEN]); |
73f5698e | 584 | else |
f9d4b0c1 | 585 | nlrule->suppress_prefixlen = -1; |
14c0b97d | 586 | |
6ef94cfa | 587 | if (tb[FRA_SUPPRESS_IFGROUP]) |
f9d4b0c1 | 588 | nlrule->suppress_ifgroup = nla_get_u32(tb[FRA_SUPPRESS_IFGROUP]); |
73f5698e | 589 | else |
f9d4b0c1 | 590 | nlrule->suppress_ifgroup = -1; |
6ef94cfa | 591 | |
0947c9fe | 592 | if (tb[FRA_GOTO]) { |
b16fb418 RP |
593 | if (nlrule->action != FR_ACT_GOTO) { |
594 | NL_SET_ERR_MSG(extack, "Unexpected goto"); | |
0947c9fe | 595 | goto errout_free; |
b16fb418 | 596 | } |
0947c9fe | 597 | |
f9d4b0c1 | 598 | nlrule->target = nla_get_u32(tb[FRA_GOTO]); |
0947c9fe | 599 | /* Backward jumps are prohibited to avoid endless loops */ |
b16fb418 RP |
600 | if (nlrule->target <= nlrule->pref) { |
601 | NL_SET_ERR_MSG(extack, "Backward goto not supported"); | |
0947c9fe | 602 | goto errout_free; |
b16fb418 | 603 | } |
f9d4b0c1 | 604 | } else if (nlrule->action == FR_ACT_GOTO) { |
b16fb418 | 605 | NL_SET_ERR_MSG(extack, "Missing goto target for action goto"); |
0947c9fe | 606 | goto errout_free; |
f9d4b0c1 | 607 | } |
0947c9fe | 608 | |
b16fb418 RP |
609 | if (nlrule->l3mdev && nlrule->table) { |
610 | NL_SET_ERR_MSG(extack, "l3mdev and table are mutually exclusive"); | |
96c63fa7 | 611 | goto errout_free; |
b16fb418 | 612 | } |
96c63fa7 | 613 | |
622ec2c9 LC |
614 | if (tb[FRA_UID_RANGE]) { |
615 | if (current_user_ns() != net->user_ns) { | |
616 | err = -EPERM; | |
b16fb418 | 617 | NL_SET_ERR_MSG(extack, "No permission to set uid"); |
622ec2c9 LC |
618 | goto errout_free; |
619 | } | |
620 | ||
f9d4b0c1 | 621 | nlrule->uid_range = nla_get_kuid_range(tb); |
622ec2c9 | 622 | |
f9d4b0c1 | 623 | if (!uid_range_set(&nlrule->uid_range) || |
b16fb418 RP |
624 | !uid_lte(nlrule->uid_range.start, nlrule->uid_range.end)) { |
625 | NL_SET_ERR_MSG(extack, "Invalid uid range"); | |
622ec2c9 | 626 | goto errout_free; |
b16fb418 | 627 | } |
622ec2c9 | 628 | } else { |
f9d4b0c1 | 629 | nlrule->uid_range = fib_kuid_range_unset; |
622ec2c9 LC |
630 | } |
631 | ||
bfff4862 | 632 | if (tb[FRA_IP_PROTO]) |
f9d4b0c1 | 633 | nlrule->ip_proto = nla_get_u8(tb[FRA_IP_PROTO]); |
bfff4862 RP |
634 | |
635 | if (tb[FRA_SPORT_RANGE]) { | |
636 | err = nla_get_port_range(tb[FRA_SPORT_RANGE], | |
f9d4b0c1 | 637 | &nlrule->sport_range); |
b16fb418 RP |
638 | if (err) { |
639 | NL_SET_ERR_MSG(extack, "Invalid sport range"); | |
bfff4862 | 640 | goto errout_free; |
b16fb418 | 641 | } |
bfff4862 RP |
642 | } |
643 | ||
644 | if (tb[FRA_DPORT_RANGE]) { | |
645 | err = nla_get_port_range(tb[FRA_DPORT_RANGE], | |
f9d4b0c1 | 646 | &nlrule->dport_range); |
b16fb418 RP |
647 | if (err) { |
648 | NL_SET_ERR_MSG(extack, "Invalid dport range"); | |
bfff4862 | 649 | goto errout_free; |
b16fb418 | 650 | } |
bfff4862 RP |
651 | } |
652 | ||
f9d4b0c1 RP |
653 | *rule = nlrule; |
654 | ||
655 | return 0; | |
656 | ||
657 | errout_free: | |
658 | kfree(nlrule); | |
659 | errout: | |
660 | return err; | |
661 | } | |
662 | ||
35e8c7ba RP |
663 | static int rule_exists(struct fib_rules_ops *ops, struct fib_rule_hdr *frh, |
664 | struct nlattr **tb, struct fib_rule *rule) | |
665 | { | |
666 | struct fib_rule *r; | |
667 | ||
668 | list_for_each_entry(r, &ops->rules_list, list) { | |
669 | if (r->action != rule->action) | |
670 | continue; | |
671 | ||
672 | if (r->table != rule->table) | |
673 | continue; | |
674 | ||
675 | if (r->pref != rule->pref) | |
676 | continue; | |
677 | ||
678 | if (memcmp(r->iifname, rule->iifname, IFNAMSIZ)) | |
679 | continue; | |
680 | ||
681 | if (memcmp(r->oifname, rule->oifname, IFNAMSIZ)) | |
682 | continue; | |
683 | ||
684 | if (r->mark != rule->mark) | |
685 | continue; | |
686 | ||
687 | if (r->suppress_ifgroup != rule->suppress_ifgroup) | |
688 | continue; | |
689 | ||
690 | if (r->suppress_prefixlen != rule->suppress_prefixlen) | |
691 | continue; | |
692 | ||
693 | if (r->mark_mask != rule->mark_mask) | |
694 | continue; | |
695 | ||
696 | if (r->tun_id != rule->tun_id) | |
697 | continue; | |
698 | ||
699 | if (r->fr_net != rule->fr_net) | |
700 | continue; | |
701 | ||
702 | if (r->l3mdev != rule->l3mdev) | |
703 | continue; | |
704 | ||
705 | if (!uid_eq(r->uid_range.start, rule->uid_range.start) || | |
706 | !uid_eq(r->uid_range.end, rule->uid_range.end)) | |
707 | continue; | |
708 | ||
709 | if (r->ip_proto != rule->ip_proto) | |
710 | continue; | |
711 | ||
712 | if (r->proto != rule->proto) | |
713 | continue; | |
714 | ||
715 | if (!fib_rule_port_range_compare(&r->sport_range, | |
716 | &rule->sport_range)) | |
717 | continue; | |
718 | ||
719 | if (!fib_rule_port_range_compare(&r->dport_range, | |
720 | &rule->dport_range)) | |
721 | continue; | |
722 | ||
723 | if (!ops->compare(r, frh, tb)) | |
724 | continue; | |
725 | return 1; | |
726 | } | |
727 | return 0; | |
728 | } | |
729 | ||
f9d4b0c1 RP |
730 | int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh, |
731 | struct netlink_ext_ack *extack) | |
732 | { | |
733 | struct net *net = sock_net(skb->sk); | |
734 | struct fib_rule_hdr *frh = nlmsg_data(nlh); | |
735 | struct fib_rules_ops *ops = NULL; | |
736 | struct fib_rule *rule = NULL, *r, *last = NULL; | |
737 | struct nlattr *tb[FRA_MAX + 1]; | |
738 | int err = -EINVAL, unresolved = 0; | |
739 | bool user_priority = false; | |
740 | ||
b16fb418 RP |
741 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) { |
742 | NL_SET_ERR_MSG(extack, "Invalid msg length"); | |
f9d4b0c1 | 743 | goto errout; |
b16fb418 | 744 | } |
f9d4b0c1 RP |
745 | |
746 | ops = lookup_rules_ops(net, frh->family); | |
747 | if (!ops) { | |
748 | err = -EAFNOSUPPORT; | |
b16fb418 | 749 | NL_SET_ERR_MSG(extack, "Rule family not supported"); |
f9d4b0c1 RP |
750 | goto errout; |
751 | } | |
752 | ||
8cb08174 JB |
753 | err = nlmsg_parse_deprecated(nlh, sizeof(*frh), tb, FRA_MAX, |
754 | ops->policy, extack); | |
b16fb418 RP |
755 | if (err < 0) { |
756 | NL_SET_ERR_MSG(extack, "Error parsing msg"); | |
f9d4b0c1 | 757 | goto errout; |
b16fb418 | 758 | } |
f9d4b0c1 RP |
759 | |
760 | err = fib_nl2rule(skb, nlh, extack, ops, tb, &rule, &user_priority); | |
761 | if (err) | |
762 | goto errout; | |
763 | ||
4970b42d HL |
764 | if ((nlh->nlmsg_flags & NLM_F_EXCL) && |
765 | rule_exists(ops, frh, tb, rule)) { | |
766 | err = -EEXIST; | |
153380ec MB |
767 | goto errout_free; |
768 | } | |
769 | ||
b16fb418 | 770 | err = ops->configure(rule, skb, frh, tb, extack); |
14c0b97d TG |
771 | if (err < 0) |
772 | goto errout_free; | |
773 | ||
9776d325 DA |
774 | err = call_fib_rule_notifiers(net, FIB_EVENT_RULE_ADD, rule, ops, |
775 | extack); | |
776 | if (err < 0) | |
777 | goto errout_free; | |
778 | ||
f9d4b0c1 RP |
779 | list_for_each_entry(r, &ops->rules_list, list) { |
780 | if (r->pref == rule->target) { | |
781 | RCU_INIT_POINTER(rule->ctarget, r); | |
782 | break; | |
783 | } | |
784 | } | |
785 | ||
786 | if (rcu_dereference_protected(rule->ctarget, 1) == NULL) | |
787 | unresolved = 1; | |
788 | ||
76c72d4f | 789 | list_for_each_entry(r, &ops->rules_list, list) { |
14c0b97d TG |
790 | if (r->pref > rule->pref) |
791 | break; | |
792 | last = r; | |
793 | } | |
794 | ||
ebb9fed2 ED |
795 | if (last) |
796 | list_add_rcu(&rule->list, &last->list); | |
797 | else | |
798 | list_add_rcu(&rule->list, &ops->rules_list); | |
799 | ||
0947c9fe TG |
800 | if (ops->unresolved_rules) { |
801 | /* | |
802 | * There are unresolved goto rules in the list, check if | |
803 | * any of them are pointing to this new rule. | |
804 | */ | |
76c72d4f | 805 | list_for_each_entry(r, &ops->rules_list, list) { |
0947c9fe | 806 | if (r->action == FR_ACT_GOTO && |
561dac2d G |
807 | r->target == rule->pref && |
808 | rtnl_dereference(r->ctarget) == NULL) { | |
0947c9fe TG |
809 | rcu_assign_pointer(r->ctarget, rule); |
810 | if (--ops->unresolved_rules == 0) | |
811 | break; | |
812 | } | |
813 | } | |
814 | } | |
815 | ||
816 | if (rule->action == FR_ACT_GOTO) | |
817 | ops->nr_goto_rules++; | |
818 | ||
819 | if (unresolved) | |
820 | ops->unresolved_rules++; | |
821 | ||
e7030878 TG |
822 | if (rule->tun_id) |
823 | ip_tunnel_need_metadata(); | |
824 | ||
15e47304 | 825 | notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).portid); |
73417f61 | 826 | flush_route_cache(ops); |
14c0b97d TG |
827 | rules_ops_put(ops); |
828 | return 0; | |
829 | ||
830 | errout_free: | |
831 | kfree(rule); | |
832 | errout: | |
833 | rules_ops_put(ops); | |
834 | return err; | |
835 | } | |
96c63fa7 | 836 | EXPORT_SYMBOL_GPL(fib_nl_newrule); |
14c0b97d | 837 | |
c21ef3e3 DA |
838 | int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh, |
839 | struct netlink_ext_ack *extack) | |
14c0b97d | 840 | { |
3b1e0a65 | 841 | struct net *net = sock_net(skb->sk); |
14c0b97d TG |
842 | struct fib_rule_hdr *frh = nlmsg_data(nlh); |
843 | struct fib_rules_ops *ops = NULL; | |
f9d4b0c1 | 844 | struct fib_rule *rule = NULL, *r, *nlrule = NULL; |
14c0b97d TG |
845 | struct nlattr *tb[FRA_MAX+1]; |
846 | int err = -EINVAL; | |
f9d4b0c1 | 847 | bool user_priority = false; |
14c0b97d | 848 | |
b16fb418 RP |
849 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) { |
850 | NL_SET_ERR_MSG(extack, "Invalid msg length"); | |
14c0b97d | 851 | goto errout; |
b16fb418 | 852 | } |
14c0b97d | 853 | |
5fd30ee7 | 854 | ops = lookup_rules_ops(net, frh->family); |
14c0b97d | 855 | if (ops == NULL) { |
2fe195cf | 856 | err = -EAFNOSUPPORT; |
b16fb418 | 857 | NL_SET_ERR_MSG(extack, "Rule family not supported"); |
14c0b97d TG |
858 | goto errout; |
859 | } | |
860 | ||
8cb08174 JB |
861 | err = nlmsg_parse_deprecated(nlh, sizeof(*frh), tb, FRA_MAX, |
862 | ops->policy, extack); | |
b16fb418 RP |
863 | if (err < 0) { |
864 | NL_SET_ERR_MSG(extack, "Error parsing msg"); | |
14c0b97d | 865 | goto errout; |
b16fb418 | 866 | } |
14c0b97d | 867 | |
f9d4b0c1 RP |
868 | err = fib_nl2rule(skb, nlh, extack, ops, tb, &nlrule, &user_priority); |
869 | if (err) | |
e1701c68 TG |
870 | goto errout; |
871 | ||
f9d4b0c1 RP |
872 | rule = rule_find(ops, frh, tb, nlrule, user_priority); |
873 | if (!rule) { | |
874 | err = -ENOENT; | |
875 | goto errout; | |
622ec2c9 LC |
876 | } |
877 | ||
f9d4b0c1 RP |
878 | if (rule->flags & FIB_RULE_PERMANENT) { |
879 | err = -EPERM; | |
880 | goto errout; | |
bfff4862 RP |
881 | } |
882 | ||
f9d4b0c1 RP |
883 | if (ops->delete) { |
884 | err = ops->delete(rule); | |
bfff4862 RP |
885 | if (err) |
886 | goto errout; | |
887 | } | |
888 | ||
f9d4b0c1 RP |
889 | if (rule->tun_id) |
890 | ip_tunnel_unneed_metadata(); | |
0ddcf43d | 891 | |
f9d4b0c1 | 892 | list_del_rcu(&rule->list); |
e7030878 | 893 | |
f9d4b0c1 RP |
894 | if (rule->action == FR_ACT_GOTO) { |
895 | ops->nr_goto_rules--; | |
896 | if (rtnl_dereference(rule->ctarget) == NULL) | |
897 | ops->unresolved_rules--; | |
898 | } | |
0947c9fe | 899 | |
f9d4b0c1 RP |
900 | /* |
901 | * Check if this rule is a target to any of them. If so, | |
902 | * adjust to the next one with the same preference or | |
903 | * disable them. As this operation is eventually very | |
904 | * expensive, it is only performed if goto rules, except | |
905 | * current if it is goto rule, have actually been added. | |
906 | */ | |
907 | if (ops->nr_goto_rules > 0) { | |
908 | struct fib_rule *n; | |
909 | ||
910 | n = list_next_entry(rule, list); | |
911 | if (&n->list == &ops->rules_list || n->pref != rule->pref) | |
912 | n = NULL; | |
913 | list_for_each_entry(r, &ops->rules_list, list) { | |
914 | if (rtnl_dereference(r->ctarget) != rule) | |
915 | continue; | |
916 | rcu_assign_pointer(r->ctarget, n); | |
917 | if (!n) | |
918 | ops->unresolved_rules++; | |
0947c9fe | 919 | } |
14c0b97d TG |
920 | } |
921 | ||
f9d4b0c1 RP |
922 | call_fib_rule_notifiers(net, FIB_EVENT_RULE_DEL, rule, ops, |
923 | NULL); | |
924 | notify_rule_change(RTM_DELRULE, rule, ops, nlh, | |
925 | NETLINK_CB(skb).portid); | |
926 | fib_rule_put(rule); | |
927 | flush_route_cache(ops); | |
928 | rules_ops_put(ops); | |
929 | kfree(nlrule); | |
930 | return 0; | |
931 | ||
14c0b97d | 932 | errout: |
778c4d5c | 933 | kfree(nlrule); |
14c0b97d TG |
934 | rules_ops_put(ops); |
935 | return err; | |
936 | } | |
96c63fa7 | 937 | EXPORT_SYMBOL_GPL(fib_nl_delrule); |
14c0b97d | 938 | |
339bf98f TG |
939 | static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops, |
940 | struct fib_rule *rule) | |
941 | { | |
942 | size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr)) | |
491deb24 | 943 | + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */ |
1b038a5e | 944 | + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */ |
339bf98f TG |
945 | + nla_total_size(4) /* FRA_PRIORITY */ |
946 | + nla_total_size(4) /* FRA_TABLE */ | |
73f5698e | 947 | + nla_total_size(4) /* FRA_SUPPRESS_PREFIXLEN */ |
6ef94cfa | 948 | + nla_total_size(4) /* FRA_SUPPRESS_IFGROUP */ |
339bf98f | 949 | + nla_total_size(4) /* FRA_FWMARK */ |
e7030878 | 950 | + nla_total_size(4) /* FRA_FWMASK */ |
622ec2c9 | 951 | + nla_total_size_64bit(8) /* FRA_TUN_ID */ |
1b71af60 | 952 | + nla_total_size(sizeof(struct fib_kuid_range)) |
bfff4862 RP |
953 | + nla_total_size(1) /* FRA_PROTOCOL */ |
954 | + nla_total_size(1) /* FRA_IP_PROTO */ | |
955 | + nla_total_size(sizeof(struct fib_rule_port_range)) /* FRA_SPORT_RANGE */ | |
956 | + nla_total_size(sizeof(struct fib_rule_port_range)); /* FRA_DPORT_RANGE */ | |
339bf98f TG |
957 | |
958 | if (ops->nlmsg_payload) | |
959 | payload += ops->nlmsg_payload(rule); | |
960 | ||
961 | return payload; | |
962 | } | |
963 | ||
14c0b97d TG |
964 | static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule, |
965 | u32 pid, u32 seq, int type, int flags, | |
966 | struct fib_rules_ops *ops) | |
967 | { | |
968 | struct nlmsghdr *nlh; | |
969 | struct fib_rule_hdr *frh; | |
970 | ||
971 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags); | |
972 | if (nlh == NULL) | |
26932566 | 973 | return -EMSGSIZE; |
14c0b97d TG |
974 | |
975 | frh = nlmsg_data(nlh); | |
28bb1726 | 976 | frh->family = ops->family; |
540e585a | 977 | frh->table = rule->table < 256 ? rule->table : RT_TABLE_COMPAT; |
0e3cea7b DM |
978 | if (nla_put_u32(skb, FRA_TABLE, rule->table)) |
979 | goto nla_put_failure; | |
73f5698e | 980 | if (nla_put_u32(skb, FRA_SUPPRESS_PREFIXLEN, rule->suppress_prefixlen)) |
7764a45a | 981 | goto nla_put_failure; |
14c0b97d | 982 | frh->res1 = 0; |
1b71af60 | 983 | frh->res2 = 0; |
14c0b97d TG |
984 | frh->action = rule->action; |
985 | frh->flags = rule->flags; | |
1b71af60 DS |
986 | |
987 | if (nla_put_u8(skb, FRA_PROTOCOL, rule->proto)) | |
988 | goto nla_put_failure; | |
14c0b97d | 989 | |
7a2b03c5 | 990 | if (rule->action == FR_ACT_GOTO && |
33d480ce | 991 | rcu_access_pointer(rule->ctarget) == NULL) |
0947c9fe TG |
992 | frh->flags |= FIB_RULE_UNRESOLVED; |
993 | ||
491deb24 | 994 | if (rule->iifname[0]) { |
0e3cea7b DM |
995 | if (nla_put_string(skb, FRA_IIFNAME, rule->iifname)) |
996 | goto nla_put_failure; | |
491deb24 PM |
997 | if (rule->iifindex == -1) |
998 | frh->flags |= FIB_RULE_IIF_DETACHED; | |
2b443683 TG |
999 | } |
1000 | ||
1b038a5e | 1001 | if (rule->oifname[0]) { |
0e3cea7b DM |
1002 | if (nla_put_string(skb, FRA_OIFNAME, rule->oifname)) |
1003 | goto nla_put_failure; | |
1b038a5e PM |
1004 | if (rule->oifindex == -1) |
1005 | frh->flags |= FIB_RULE_OIF_DETACHED; | |
1006 | } | |
1007 | ||
0e3cea7b DM |
1008 | if ((rule->pref && |
1009 | nla_put_u32(skb, FRA_PRIORITY, rule->pref)) || | |
1010 | (rule->mark && | |
1011 | nla_put_u32(skb, FRA_FWMARK, rule->mark)) || | |
1012 | ((rule->mark_mask || rule->mark) && | |
1013 | nla_put_u32(skb, FRA_FWMASK, rule->mark_mask)) || | |
1014 | (rule->target && | |
e7030878 TG |
1015 | nla_put_u32(skb, FRA_GOTO, rule->target)) || |
1016 | (rule->tun_id && | |
96c63fa7 DA |
1017 | nla_put_be64(skb, FRA_TUN_ID, rule->tun_id, FRA_PAD)) || |
1018 | (rule->l3mdev && | |
622ec2c9 LC |
1019 | nla_put_u8(skb, FRA_L3MDEV, rule->l3mdev)) || |
1020 | (uid_range_set(&rule->uid_range) && | |
bfff4862 RP |
1021 | nla_put_uid_range(skb, &rule->uid_range)) || |
1022 | (fib_rule_port_range_set(&rule->sport_range) && | |
1023 | nla_put_port_range(skb, FRA_SPORT_RANGE, &rule->sport_range)) || | |
1024 | (fib_rule_port_range_set(&rule->dport_range) && | |
1025 | nla_put_port_range(skb, FRA_DPORT_RANGE, &rule->dport_range)) || | |
1026 | (rule->ip_proto && nla_put_u8(skb, FRA_IP_PROTO, rule->ip_proto))) | |
0e3cea7b | 1027 | goto nla_put_failure; |
6ef94cfa ST |
1028 | |
1029 | if (rule->suppress_ifgroup != -1) { | |
1030 | if (nla_put_u32(skb, FRA_SUPPRESS_IFGROUP, rule->suppress_ifgroup)) | |
1031 | goto nla_put_failure; | |
1032 | } | |
1033 | ||
04af8cf6 | 1034 | if (ops->fill(rule, skb, frh) < 0) |
14c0b97d TG |
1035 | goto nla_put_failure; |
1036 | ||
053c095a JB |
1037 | nlmsg_end(skb, nlh); |
1038 | return 0; | |
14c0b97d TG |
1039 | |
1040 | nla_put_failure: | |
26932566 PM |
1041 | nlmsg_cancel(skb, nlh); |
1042 | return -EMSGSIZE; | |
14c0b97d TG |
1043 | } |
1044 | ||
c454673d TG |
1045 | static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb, |
1046 | struct fib_rules_ops *ops) | |
14c0b97d TG |
1047 | { |
1048 | int idx = 0; | |
1049 | struct fib_rule *rule; | |
41fc0143 | 1050 | int err = 0; |
14c0b97d | 1051 | |
e67f88dd ED |
1052 | rcu_read_lock(); |
1053 | list_for_each_entry_rcu(rule, &ops->rules_list, list) { | |
c454673d | 1054 | if (idx < cb->args[1]) |
14c0b97d TG |
1055 | goto skip; |
1056 | ||
41fc0143 WK |
1057 | err = fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).portid, |
1058 | cb->nlh->nlmsg_seq, RTM_NEWRULE, | |
1059 | NLM_F_MULTI, ops); | |
1060 | if (err) | |
14c0b97d TG |
1061 | break; |
1062 | skip: | |
1063 | idx++; | |
1064 | } | |
2907c35f | 1065 | rcu_read_unlock(); |
c454673d | 1066 | cb->args[1] = idx; |
14c0b97d TG |
1067 | rules_ops_put(ops); |
1068 | ||
41fc0143 | 1069 | return err; |
14c0b97d TG |
1070 | } |
1071 | ||
4a73e5e5 DA |
1072 | static int fib_valid_dumprule_req(const struct nlmsghdr *nlh, |
1073 | struct netlink_ext_ack *extack) | |
1074 | { | |
1075 | struct fib_rule_hdr *frh; | |
1076 | ||
1077 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) { | |
1078 | NL_SET_ERR_MSG(extack, "Invalid header for fib rule dump request"); | |
1079 | return -EINVAL; | |
1080 | } | |
1081 | ||
1082 | frh = nlmsg_data(nlh); | |
1083 | if (frh->dst_len || frh->src_len || frh->tos || frh->table || | |
1084 | frh->res1 || frh->res2 || frh->action || frh->flags) { | |
1085 | NL_SET_ERR_MSG(extack, | |
1086 | "Invalid values in header for fib rule dump request"); | |
1087 | return -EINVAL; | |
1088 | } | |
1089 | ||
1090 | if (nlmsg_attrlen(nlh, sizeof(*frh))) { | |
1091 | NL_SET_ERR_MSG(extack, "Invalid data after header in fib rule dump request"); | |
1092 | return -EINVAL; | |
1093 | } | |
1094 | ||
1095 | return 0; | |
1096 | } | |
1097 | ||
c454673d TG |
1098 | static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb) |
1099 | { | |
4a73e5e5 | 1100 | const struct nlmsghdr *nlh = cb->nlh; |
3b1e0a65 | 1101 | struct net *net = sock_net(skb->sk); |
c454673d TG |
1102 | struct fib_rules_ops *ops; |
1103 | int idx = 0, family; | |
1104 | ||
4a73e5e5 DA |
1105 | if (cb->strict_check) { |
1106 | int err = fib_valid_dumprule_req(nlh, cb->extack); | |
1107 | ||
1108 | if (err < 0) | |
1109 | return err; | |
1110 | } | |
1111 | ||
1112 | family = rtnl_msg_family(nlh); | |
c454673d TG |
1113 | if (family != AF_UNSPEC) { |
1114 | /* Protocol specific dump request */ | |
5fd30ee7 | 1115 | ops = lookup_rules_ops(net, family); |
c454673d TG |
1116 | if (ops == NULL) |
1117 | return -EAFNOSUPPORT; | |
1118 | ||
41fc0143 WK |
1119 | dump_rules(skb, cb, ops); |
1120 | ||
1121 | return skb->len; | |
c454673d TG |
1122 | } |
1123 | ||
1124 | rcu_read_lock(); | |
5fd30ee7 | 1125 | list_for_each_entry_rcu(ops, &net->rules_ops, list) { |
c454673d TG |
1126 | if (idx < cb->args[0] || !try_module_get(ops->owner)) |
1127 | goto skip; | |
1128 | ||
1129 | if (dump_rules(skb, cb, ops) < 0) | |
1130 | break; | |
1131 | ||
1132 | cb->args[1] = 0; | |
2fb3573d | 1133 | skip: |
c454673d TG |
1134 | idx++; |
1135 | } | |
1136 | rcu_read_unlock(); | |
1137 | cb->args[0] = idx; | |
1138 | ||
1139 | return skb->len; | |
1140 | } | |
14c0b97d | 1141 | |
9e3a5487 | 1142 | static void notify_rule_change(int event, struct fib_rule *rule, |
c17084d2 TG |
1143 | struct fib_rules_ops *ops, struct nlmsghdr *nlh, |
1144 | u32 pid) | |
14c0b97d | 1145 | { |
9e3a5487 | 1146 | struct net *net; |
c17084d2 TG |
1147 | struct sk_buff *skb; |
1148 | int err = -ENOBUFS; | |
14c0b97d | 1149 | |
9e3a5487 | 1150 | net = ops->fro_net; |
339bf98f | 1151 | skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL); |
14c0b97d | 1152 | if (skb == NULL) |
c17084d2 TG |
1153 | goto errout; |
1154 | ||
1155 | err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops); | |
26932566 PM |
1156 | if (err < 0) { |
1157 | /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */ | |
1158 | WARN_ON(err == -EMSGSIZE); | |
1159 | kfree_skb(skb); | |
1160 | goto errout; | |
1161 | } | |
9e3a5487 | 1162 | |
1ce85fe4 PNA |
1163 | rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL); |
1164 | return; | |
c17084d2 TG |
1165 | errout: |
1166 | if (err < 0) | |
5fd30ee7 | 1167 | rtnl_set_sk_err(net, ops->nlgroup, err); |
14c0b97d TG |
1168 | } |
1169 | ||
1170 | static void attach_rules(struct list_head *rules, struct net_device *dev) | |
1171 | { | |
1172 | struct fib_rule *rule; | |
1173 | ||
1174 | list_for_each_entry(rule, rules, list) { | |
491deb24 PM |
1175 | if (rule->iifindex == -1 && |
1176 | strcmp(dev->name, rule->iifname) == 0) | |
1177 | rule->iifindex = dev->ifindex; | |
1b038a5e PM |
1178 | if (rule->oifindex == -1 && |
1179 | strcmp(dev->name, rule->oifname) == 0) | |
1180 | rule->oifindex = dev->ifindex; | |
14c0b97d TG |
1181 | } |
1182 | } | |
1183 | ||
1184 | static void detach_rules(struct list_head *rules, struct net_device *dev) | |
1185 | { | |
1186 | struct fib_rule *rule; | |
1187 | ||
1b038a5e | 1188 | list_for_each_entry(rule, rules, list) { |
491deb24 PM |
1189 | if (rule->iifindex == dev->ifindex) |
1190 | rule->iifindex = -1; | |
1b038a5e PM |
1191 | if (rule->oifindex == dev->ifindex) |
1192 | rule->oifindex = -1; | |
1193 | } | |
14c0b97d TG |
1194 | } |
1195 | ||
1196 | ||
1197 | static int fib_rules_event(struct notifier_block *this, unsigned long event, | |
351638e7 | 1198 | void *ptr) |
14c0b97d | 1199 | { |
351638e7 | 1200 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 1201 | struct net *net = dev_net(dev); |
14c0b97d TG |
1202 | struct fib_rules_ops *ops; |
1203 | ||
748e2d93 | 1204 | ASSERT_RTNL(); |
14c0b97d TG |
1205 | |
1206 | switch (event) { | |
1207 | case NETDEV_REGISTER: | |
5fd30ee7 | 1208 | list_for_each_entry(ops, &net->rules_ops, list) |
76c72d4f | 1209 | attach_rules(&ops->rules_list, dev); |
14c0b97d TG |
1210 | break; |
1211 | ||
946c032e MŻ |
1212 | case NETDEV_CHANGENAME: |
1213 | list_for_each_entry(ops, &net->rules_ops, list) { | |
1214 | detach_rules(&ops->rules_list, dev); | |
1215 | attach_rules(&ops->rules_list, dev); | |
1216 | } | |
1217 | break; | |
1218 | ||
14c0b97d | 1219 | case NETDEV_UNREGISTER: |
5fd30ee7 | 1220 | list_for_each_entry(ops, &net->rules_ops, list) |
76c72d4f | 1221 | detach_rules(&ops->rules_list, dev); |
14c0b97d TG |
1222 | break; |
1223 | } | |
1224 | ||
14c0b97d TG |
1225 | return NOTIFY_DONE; |
1226 | } | |
1227 | ||
1228 | static struct notifier_block fib_rules_notifier = { | |
1229 | .notifier_call = fib_rules_event, | |
1230 | }; | |
1231 | ||
2c8c1e72 | 1232 | static int __net_init fib_rules_net_init(struct net *net) |
5fd30ee7 DL |
1233 | { |
1234 | INIT_LIST_HEAD(&net->rules_ops); | |
1235 | spin_lock_init(&net->rules_mod_lock); | |
1236 | return 0; | |
1237 | } | |
1238 | ||
ce2b7db3 VA |
1239 | static void __net_exit fib_rules_net_exit(struct net *net) |
1240 | { | |
1241 | WARN_ON_ONCE(!list_empty(&net->rules_ops)); | |
1242 | } | |
1243 | ||
5fd30ee7 DL |
1244 | static struct pernet_operations fib_rules_net_ops = { |
1245 | .init = fib_rules_net_init, | |
ce2b7db3 | 1246 | .exit = fib_rules_net_exit, |
5fd30ee7 DL |
1247 | }; |
1248 | ||
14c0b97d TG |
1249 | static int __init fib_rules_init(void) |
1250 | { | |
5fd30ee7 | 1251 | int err; |
b97bac64 FW |
1252 | rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL, 0); |
1253 | rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL, 0); | |
1254 | rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule, 0); | |
9d9e6a58 | 1255 | |
5d6d4809 | 1256 | err = register_pernet_subsys(&fib_rules_net_ops); |
5fd30ee7 DL |
1257 | if (err < 0) |
1258 | goto fail; | |
1259 | ||
5d6d4809 | 1260 | err = register_netdevice_notifier(&fib_rules_notifier); |
5fd30ee7 DL |
1261 | if (err < 0) |
1262 | goto fail_unregister; | |
5d6d4809 | 1263 | |
5fd30ee7 DL |
1264 | return 0; |
1265 | ||
1266 | fail_unregister: | |
5d6d4809 | 1267 | unregister_pernet_subsys(&fib_rules_net_ops); |
5fd30ee7 DL |
1268 | fail: |
1269 | rtnl_unregister(PF_UNSPEC, RTM_NEWRULE); | |
1270 | rtnl_unregister(PF_UNSPEC, RTM_DELRULE); | |
1271 | rtnl_unregister(PF_UNSPEC, RTM_GETRULE); | |
1272 | return err; | |
14c0b97d TG |
1273 | } |
1274 | ||
1275 | subsys_initcall(fib_rules_init); |