blob: 98e1066c3d551df066fd7681f197718f75afb251 [file] [log] [blame]
Thomas Graf14c0b972006-08-04 03:38:38 -07001/*
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
Thomas Graf14c0b972006-08-04 03:38:38 -070011#include <linux/types.h>
12#include <linux/kernel.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090013#include <linux/slab.h>
Thomas Graf14c0b972006-08-04 03:38:38 -070014#include <linux/list.h>
Paul Gortmaker3a9a2312011-05-27 09:12:25 -040015#include <linux/module.h>
Eric W. Biedermane9dc8652007-09-12 13:02:17 +020016#include <net/net_namespace.h>
Eric W. Biederman881d9662007-09-17 11:56:21 -070017#include <net/sock.h>
Thomas Graf14c0b972006-08-04 03:38:38 -070018#include <net/fib_rules.h>
Thomas Grafe7030872015-07-21 10:44:01 +020019#include <net/ip_tunnels.h>
Thomas Graf14c0b972006-08-04 03:38:38 -070020
Lorenzo Colitti622ec2c2016-11-04 02:23:42 +090021static const struct fib_kuid_range fib_kuid_range_unset = {
22 KUIDT_INIT(0),
23 KUIDT_INIT(~0),
24};
25
Ido Schimmel3c710062017-03-16 09:08:12 +010026bool fib_rule_matchall(const struct fib_rule *rule)
27{
28 if (rule->iifindex || rule->oifindex || rule->mark || rule->tun_id ||
29 rule->flags)
30 return false;
31 if (rule->suppress_ifgroup != -1 || rule->suppress_prefixlen != -1)
32 return false;
33 if (!uid_eq(rule->uid_range.start, fib_kuid_range_unset.start) ||
34 !uid_eq(rule->uid_range.end, fib_kuid_range_unset.end))
35 return false;
36 return true;
37}
38EXPORT_SYMBOL_GPL(fib_rule_matchall);
39
Denis V. Lunev2994c6382007-11-10 22:12:03 -080040int fib_default_rule_add(struct fib_rules_ops *ops,
41 u32 pref, u32 table, u32 flags)
42{
43 struct fib_rule *r;
44
45 r = kzalloc(ops->rule_size, GFP_KERNEL);
46 if (r == NULL)
47 return -ENOMEM;
48
Reshetova, Elena717d1e92017-06-30 13:08:06 +030049 refcount_set(&r->refcnt, 1);
Denis V. Lunev2994c6382007-11-10 22:12:03 -080050 r->action = FR_ACT_TO_TBL;
51 r->pref = pref;
52 r->table = table;
53 r->flags = flags;
Eric W. Biedermanefd7ef12015-03-11 23:04:08 -050054 r->fr_net = ops->fro_net;
Lorenzo Colitti622ec2c2016-11-04 02:23:42 +090055 r->uid_range = fib_kuid_range_unset;
Denis V. Lunev2994c6382007-11-10 22:12:03 -080056
Stefan Tomanek73f56982013-08-03 14:14:43 +020057 r->suppress_prefixlen = -1;
58 r->suppress_ifgroup = -1;
59
Denis V. Lunev2994c6382007-11-10 22:12:03 -080060 /* The lock is not required here, the list in unreacheable
61 * at the moment this function is called */
62 list_add_tail(&r->list, &ops->rules_list);
63 return 0;
64}
65EXPORT_SYMBOL(fib_default_rule_add);
66
Phil Sutterf53de1e2015-09-09 14:20:56 +020067static u32 fib_default_rule_pref(struct fib_rules_ops *ops)
Patrick McHardyd8a566b2010-04-13 05:03:15 +000068{
69 struct list_head *pos;
70 struct fib_rule *rule;
71
72 if (!list_empty(&ops->rules_list)) {
73 pos = ops->rules_list.next;
74 if (pos->next != &ops->rules_list) {
75 rule = list_entry(pos->next, struct fib_rule, list);
76 if (rule->pref)
77 return rule->pref - 1;
78 }
79 }
80
81 return 0;
82}
Patrick McHardyd8a566b2010-04-13 05:03:15 +000083
Denis V. Lunev9e3a5482008-01-20 16:46:41 -080084static void notify_rule_change(int event, struct fib_rule *rule,
Thomas Grafc17084d2006-08-15 00:32:48 -070085 struct fib_rules_ops *ops, struct nlmsghdr *nlh,
86 u32 pid);
Thomas Graf14c0b972006-08-04 03:38:38 -070087
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -080088static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family)
Thomas Graf14c0b972006-08-04 03:38:38 -070089{
90 struct fib_rules_ops *ops;
91
92 rcu_read_lock();
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -080093 list_for_each_entry_rcu(ops, &net->rules_ops, list) {
Thomas Graf14c0b972006-08-04 03:38:38 -070094 if (ops->family == family) {
95 if (!try_module_get(ops->owner))
96 ops = NULL;
97 rcu_read_unlock();
98 return ops;
99 }
100 }
101 rcu_read_unlock();
102
103 return NULL;
104}
105
106static void rules_ops_put(struct fib_rules_ops *ops)
107{
108 if (ops)
109 module_put(ops->owner);
110}
111
Thomas Graf73417f62007-03-27 13:56:52 -0700112static void flush_route_cache(struct fib_rules_ops *ops)
113{
114 if (ops->flush_cache)
Denis V. Lunevae299fc2008-07-05 19:01:28 -0700115 ops->flush_cache(ops);
Thomas Graf73417f62007-03-27 13:56:52 -0700116}
117
Eric W. Biedermane9c51582009-12-03 12:22:55 -0800118static int __fib_rules_register(struct fib_rules_ops *ops)
Thomas Graf14c0b972006-08-04 03:38:38 -0700119{
120 int err = -EEXIST;
121 struct fib_rules_ops *o;
Denis V. Lunev9e3a5482008-01-20 16:46:41 -0800122 struct net *net;
123
124 net = ops->fro_net;
Thomas Graf14c0b972006-08-04 03:38:38 -0700125
126 if (ops->rule_size < sizeof(struct fib_rule))
127 return -EINVAL;
128
129 if (ops->match == NULL || ops->configure == NULL ||
130 ops->compare == NULL || ops->fill == NULL ||
131 ops->action == NULL)
132 return -EINVAL;
133
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800134 spin_lock(&net->rules_mod_lock);
135 list_for_each_entry(o, &net->rules_ops, list)
Thomas Graf14c0b972006-08-04 03:38:38 -0700136 if (ops->family == o->family)
137 goto errout;
138
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800139 list_add_tail_rcu(&ops->list, &net->rules_ops);
Thomas Graf14c0b972006-08-04 03:38:38 -0700140 err = 0;
141errout:
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800142 spin_unlock(&net->rules_mod_lock);
Thomas Graf14c0b972006-08-04 03:38:38 -0700143
144 return err;
145}
146
Eric W. Biedermane9c51582009-12-03 12:22:55 -0800147struct fib_rules_ops *
Patrick McHardy3d0c9c42010-04-26 16:02:04 +0200148fib_rules_register(const struct fib_rules_ops *tmpl, struct net *net)
Eric W. Biedermane9c51582009-12-03 12:22:55 -0800149{
150 struct fib_rules_ops *ops;
151 int err;
152
Eric Dumazet2fb35732010-03-09 20:03:38 +0000153 ops = kmemdup(tmpl, sizeof(*ops), GFP_KERNEL);
Eric W. Biedermane9c51582009-12-03 12:22:55 -0800154 if (ops == NULL)
155 return ERR_PTR(-ENOMEM);
156
157 INIT_LIST_HEAD(&ops->rules_list);
158 ops->fro_net = net;
159
160 err = __fib_rules_register(ops);
161 if (err) {
162 kfree(ops);
163 ops = ERR_PTR(err);
164 }
165
166 return ops;
167}
Thomas Graf14c0b972006-08-04 03:38:38 -0700168EXPORT_SYMBOL_GPL(fib_rules_register);
169
stephen hemminger1df99162010-10-04 20:14:17 +0000170static void fib_rules_cleanup_ops(struct fib_rules_ops *ops)
Thomas Graf14c0b972006-08-04 03:38:38 -0700171{
172 struct fib_rule *rule, *tmp;
173
Denis V. Lunev76c72d42007-09-16 15:44:27 -0700174 list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) {
Thomas Graf14c0b972006-08-04 03:38:38 -0700175 list_del_rcu(&rule->list);
David S. Miller7a9bc9b2012-06-29 01:32:45 -0700176 if (ops->delete)
177 ops->delete(rule);
Thomas Graf14c0b972006-08-04 03:38:38 -0700178 fib_rule_put(rule);
179 }
180}
181
Denis V. Lunev9e3a5482008-01-20 16:46:41 -0800182void fib_rules_unregister(struct fib_rules_ops *ops)
Thomas Graf14c0b972006-08-04 03:38:38 -0700183{
Denis V. Lunev9e3a5482008-01-20 16:46:41 -0800184 struct net *net = ops->fro_net;
Thomas Graf14c0b972006-08-04 03:38:38 -0700185
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800186 spin_lock(&net->rules_mod_lock);
Denis V. Lunev72132c1b2008-01-14 22:59:30 -0800187 list_del_rcu(&ops->list);
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800188 spin_unlock(&net->rules_mod_lock);
Thomas Graf14c0b972006-08-04 03:38:38 -0700189
WANG Cong419df122015-03-31 11:01:46 -0700190 fib_rules_cleanup_ops(ops);
Eric W. Biedermanefd7ef12015-03-11 23:04:08 -0500191 kfree_rcu(ops, rcu);
Thomas Graf14c0b972006-08-04 03:38:38 -0700192}
Thomas Graf14c0b972006-08-04 03:38:38 -0700193EXPORT_SYMBOL_GPL(fib_rules_unregister);
194
Lorenzo Colitti622ec2c2016-11-04 02:23:42 +0900195static int uid_range_set(struct fib_kuid_range *range)
196{
197 return uid_valid(range->start) && uid_valid(range->end);
198}
199
200static struct fib_kuid_range nla_get_kuid_range(struct nlattr **tb)
201{
202 struct fib_rule_uid_range *in;
203 struct fib_kuid_range out;
204
205 in = (struct fib_rule_uid_range *)nla_data(tb[FRA_UID_RANGE]);
206
207 out.start = make_kuid(current_user_ns(), in->start);
208 out.end = make_kuid(current_user_ns(), in->end);
209
210 return out;
211}
212
213static int nla_put_uid_range(struct sk_buff *skb, struct fib_kuid_range *range)
214{
215 struct fib_rule_uid_range out = {
216 from_kuid_munged(current_user_ns(), range->start),
217 from_kuid_munged(current_user_ns(), range->end)
218 };
219
220 return nla_put(skb, FRA_UID_RANGE, sizeof(out), &out);
221}
222
Thomas Graf3dfbcc42006-11-09 15:23:20 -0800223static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
David Ahern96c63fa2016-06-08 10:55:39 -0700224 struct flowi *fl, int flags,
225 struct fib_lookup_arg *arg)
Thomas Graf3dfbcc42006-11-09 15:23:20 -0800226{
227 int ret = 0;
228
David S. Miller1d28f422011-03-12 00:29:39 -0500229 if (rule->iifindex && (rule->iifindex != fl->flowi_iif))
Thomas Graf3dfbcc42006-11-09 15:23:20 -0800230 goto out;
231
David S. Miller1d28f422011-03-12 00:29:39 -0500232 if (rule->oifindex && (rule->oifindex != fl->flowi_oif))
Patrick McHardy1b038a52009-12-03 01:25:56 +0000233 goto out;
234
David S. Miller1d28f422011-03-12 00:29:39 -0500235 if ((rule->mark ^ fl->flowi_mark) & rule->mark_mask)
Thomas Graf3dfbcc42006-11-09 15:23:20 -0800236 goto out;
237
Thomas Grafe7030872015-07-21 10:44:01 +0200238 if (rule->tun_id && (rule->tun_id != fl->flowi_tun_key.tun_id))
239 goto out;
240
David Ahern96c63fa2016-06-08 10:55:39 -0700241 if (rule->l3mdev && !l3mdev_fib_rule_match(rule->fr_net, fl, arg))
242 goto out;
243
Lorenzo Colitti622ec2c2016-11-04 02:23:42 +0900244 if (uid_lt(fl->flowi_uid, rule->uid_range.start) ||
245 uid_gt(fl->flowi_uid, rule->uid_range.end))
246 goto out;
247
Thomas Graf3dfbcc42006-11-09 15:23:20 -0800248 ret = ops->match(rule, fl, flags);
249out:
250 return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
251}
252
Thomas Graf14c0b972006-08-04 03:38:38 -0700253int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl,
254 int flags, struct fib_lookup_arg *arg)
255{
256 struct fib_rule *rule;
257 int err;
258
259 rcu_read_lock();
260
Denis V. Lunev76c72d42007-09-16 15:44:27 -0700261 list_for_each_entry_rcu(rule, &ops->rules_list, list) {
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700262jumped:
David Ahern96c63fa2016-06-08 10:55:39 -0700263 if (!fib_rule_match(rule, ops, fl, flags, arg))
Thomas Graf14c0b972006-08-04 03:38:38 -0700264 continue;
265
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700266 if (rule->action == FR_ACT_GOTO) {
267 struct fib_rule *target;
268
269 target = rcu_dereference(rule->ctarget);
270 if (target == NULL) {
271 continue;
272 } else {
273 rule = target;
274 goto jumped;
275 }
Thomas Graffa0b2d12007-03-26 17:38:53 -0700276 } else if (rule->action == FR_ACT_NOP)
277 continue;
278 else
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700279 err = ops->action(rule, fl, flags, arg);
280
Stefan Tomanek7764a452013-08-01 02:17:15 +0200281 if (!err && ops->suppress && ops->suppress(rule, arg))
282 continue;
283
Thomas Graf14c0b972006-08-04 03:38:38 -0700284 if (err != -EAGAIN) {
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000285 if ((arg->flags & FIB_LOOKUP_NOREF) ||
Reshetova, Elena717d1e92017-06-30 13:08:06 +0300286 likely(refcount_inc_not_zero(&rule->refcnt))) {
Eric Dumazet7fa7cb72010-09-27 04:18:27 +0000287 arg->rule = rule;
288 goto out;
289 }
290 break;
Thomas Graf14c0b972006-08-04 03:38:38 -0700291 }
292 }
293
Steven Whitehouse83886b62007-03-30 13:34:27 -0700294 err = -ESRCH;
Thomas Graf14c0b972006-08-04 03:38:38 -0700295out:
296 rcu_read_unlock();
297
298 return err;
299}
Thomas Graf14c0b972006-08-04 03:38:38 -0700300EXPORT_SYMBOL_GPL(fib_rules_lookup);
301
Ido Schimmel1b2a4442017-08-03 13:28:14 +0200302static int call_fib_rule_notifier(struct notifier_block *nb, struct net *net,
303 enum fib_event_type event_type,
304 struct fib_rule *rule, int family)
305{
306 struct fib_rule_notifier_info info = {
307 .info.family = family,
308 .rule = rule,
309 };
310
311 return call_fib_notifier(nb, net, event_type, &info.info);
312}
313
314static int call_fib_rule_notifiers(struct net *net,
315 enum fib_event_type event_type,
316 struct fib_rule *rule,
David Ahern6c31e5a2017-10-27 17:37:13 -0700317 struct fib_rules_ops *ops,
318 struct netlink_ext_ack *extack)
Ido Schimmel1b2a4442017-08-03 13:28:14 +0200319{
320 struct fib_rule_notifier_info info = {
321 .info.family = ops->family,
David Ahern6c31e5a2017-10-27 17:37:13 -0700322 .info.extack = extack,
Ido Schimmel1b2a4442017-08-03 13:28:14 +0200323 .rule = rule,
324 };
325
326 ops->fib_rules_seq++;
327 return call_fib_notifiers(net, event_type, &info.info);
328}
329
330/* Called with rcu_read_lock() */
331int fib_rules_dump(struct net *net, struct notifier_block *nb, int family)
332{
333 struct fib_rules_ops *ops;
334 struct fib_rule *rule;
335
336 ops = lookup_rules_ops(net, family);
337 if (!ops)
338 return -EAFNOSUPPORT;
339 list_for_each_entry_rcu(rule, &ops->rules_list, list)
340 call_fib_rule_notifier(nb, net, FIB_EVENT_RULE_ADD, rule,
341 family);
342 rules_ops_put(ops);
343
344 return 0;
345}
346EXPORT_SYMBOL_GPL(fib_rules_dump);
347
348unsigned int fib_rules_seq_read(struct net *net, int family)
349{
350 unsigned int fib_rules_seq;
351 struct fib_rules_ops *ops;
352
353 ASSERT_RTNL();
354
355 ops = lookup_rules_ops(net, family);
356 if (!ops)
357 return 0;
358 fib_rules_seq = ops->fib_rules_seq;
359 rules_ops_put(ops);
360
361 return fib_rules_seq;
362}
363EXPORT_SYMBOL_GPL(fib_rules_seq_read);
364
Thomas Grafe1701c62007-03-24 12:46:02 -0700365static int validate_rulemsg(struct fib_rule_hdr *frh, struct nlattr **tb,
366 struct fib_rules_ops *ops)
367{
368 int err = -EINVAL;
369
370 if (frh->src_len)
371 if (tb[FRA_SRC] == NULL ||
372 frh->src_len > (ops->addr_size * 8) ||
373 nla_len(tb[FRA_SRC]) != ops->addr_size)
374 goto errout;
375
376 if (frh->dst_len)
377 if (tb[FRA_DST] == NULL ||
378 frh->dst_len > (ops->addr_size * 8) ||
379 nla_len(tb[FRA_DST]) != ops->addr_size)
380 goto errout;
381
382 err = 0;
383errout:
384 return err;
385}
386
Mateusz Bajorski153380e2016-06-29 09:22:10 +0200387static int rule_exists(struct fib_rules_ops *ops, struct fib_rule_hdr *frh,
388 struct nlattr **tb, struct fib_rule *rule)
389{
390 struct fib_rule *r;
391
392 list_for_each_entry(r, &ops->rules_list, list) {
393 if (r->action != rule->action)
394 continue;
395
396 if (r->table != rule->table)
397 continue;
398
399 if (r->pref != rule->pref)
400 continue;
401
402 if (memcmp(r->iifname, rule->iifname, IFNAMSIZ))
403 continue;
404
405 if (memcmp(r->oifname, rule->oifname, IFNAMSIZ))
406 continue;
407
408 if (r->mark != rule->mark)
409 continue;
410
411 if (r->mark_mask != rule->mark_mask)
412 continue;
413
414 if (r->tun_id != rule->tun_id)
415 continue;
416
417 if (r->fr_net != rule->fr_net)
418 continue;
419
420 if (r->l3mdev != rule->l3mdev)
421 continue;
422
Lorenzo Colitti35b80732016-11-07 00:16:25 +0900423 if (!uid_eq(r->uid_range.start, rule->uid_range.start) ||
424 !uid_eq(r->uid_range.end, rule->uid_range.end))
425 continue;
426
Mateusz Bajorski153380e2016-06-29 09:22:10 +0200427 if (!ops->compare(r, frh, tb))
428 continue;
429 return 1;
430 }
431 return 0;
432}
433
David Ahernc21ef3e2017-04-16 09:48:24 -0700434int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
435 struct netlink_ext_ack *extack)
Thomas Graf14c0b972006-08-04 03:38:38 -0700436{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900437 struct net *net = sock_net(skb->sk);
Thomas Graf14c0b972006-08-04 03:38:38 -0700438 struct fib_rule_hdr *frh = nlmsg_data(nlh);
439 struct fib_rules_ops *ops = NULL;
440 struct fib_rule *rule, *r, *last = NULL;
441 struct nlattr *tb[FRA_MAX+1];
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700442 int err = -EINVAL, unresolved = 0;
Thomas Graf14c0b972006-08-04 03:38:38 -0700443
444 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
445 goto errout;
446
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800447 ops = lookup_rules_ops(net, frh->family);
Thomas Graf14c0b972006-08-04 03:38:38 -0700448 if (ops == NULL) {
Patrick McHardy2fe195c2008-07-01 19:59:37 -0700449 err = -EAFNOSUPPORT;
Thomas Graf14c0b972006-08-04 03:38:38 -0700450 goto errout;
451 }
452
David Ahernc21ef3e2017-04-16 09:48:24 -0700453 err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy, extack);
Thomas Graf14c0b972006-08-04 03:38:38 -0700454 if (err < 0)
455 goto errout;
456
Thomas Grafe1701c62007-03-24 12:46:02 -0700457 err = validate_rulemsg(frh, tb, ops);
458 if (err < 0)
459 goto errout;
460
Thomas Graf14c0b972006-08-04 03:38:38 -0700461 rule = kzalloc(ops->rule_size, GFP_KERNEL);
462 if (rule == NULL) {
463 err = -ENOMEM;
464 goto errout;
465 }
David Ahern5d89fb32017-07-13 13:36:40 -0700466 refcount_set(&rule->refcnt, 1);
Eric W. Biedermanefd7ef12015-03-11 23:04:08 -0500467 rule->fr_net = net;
Thomas Graf14c0b972006-08-04 03:38:38 -0700468
Phil Sutterf53de1e2015-09-09 14:20:56 +0200469 rule->pref = tb[FRA_PRIORITY] ? nla_get_u32(tb[FRA_PRIORITY])
470 : fib_default_rule_pref(ops);
Thomas Graf14c0b972006-08-04 03:38:38 -0700471
Patrick McHardy491deb22009-12-03 01:25:54 +0000472 if (tb[FRA_IIFNAME]) {
Thomas Graf14c0b972006-08-04 03:38:38 -0700473 struct net_device *dev;
474
Patrick McHardy491deb22009-12-03 01:25:54 +0000475 rule->iifindex = -1;
476 nla_strlcpy(rule->iifname, tb[FRA_IIFNAME], IFNAMSIZ);
477 dev = __dev_get_by_name(net, rule->iifname);
Thomas Graf14c0b972006-08-04 03:38:38 -0700478 if (dev)
Patrick McHardy491deb22009-12-03 01:25:54 +0000479 rule->iifindex = dev->ifindex;
Thomas Graf14c0b972006-08-04 03:38:38 -0700480 }
481
Patrick McHardy1b038a52009-12-03 01:25:56 +0000482 if (tb[FRA_OIFNAME]) {
483 struct net_device *dev;
484
485 rule->oifindex = -1;
486 nla_strlcpy(rule->oifname, tb[FRA_OIFNAME], IFNAMSIZ);
487 dev = __dev_get_by_name(net, rule->oifname);
488 if (dev)
489 rule->oifindex = dev->ifindex;
490 }
491
Thomas Grafb8964ed2006-11-09 15:22:18 -0800492 if (tb[FRA_FWMARK]) {
493 rule->mark = nla_get_u32(tb[FRA_FWMARK]);
494 if (rule->mark)
495 /* compatibility: if the mark value is non-zero all bits
496 * are compared unless a mask is explicitly specified.
497 */
498 rule->mark_mask = 0xFFFFFFFF;
499 }
500
501 if (tb[FRA_FWMASK])
502 rule->mark_mask = nla_get_u32(tb[FRA_FWMASK]);
503
Thomas Grafe7030872015-07-21 10:44:01 +0200504 if (tb[FRA_TUN_ID])
505 rule->tun_id = nla_get_be64(tb[FRA_TUN_ID]);
506
Wei Yongjunadeb45c2017-04-26 14:03:50 +0000507 err = -EINVAL;
David Ahern96c63fa2016-06-08 10:55:39 -0700508 if (tb[FRA_L3MDEV]) {
509#ifdef CONFIG_NET_L3_MASTER_DEV
510 rule->l3mdev = nla_get_u8(tb[FRA_L3MDEV]);
511 if (rule->l3mdev != 1)
512#endif
513 goto errout_free;
514 }
515
Thomas Graf14c0b972006-08-04 03:38:38 -0700516 rule->action = frh->action;
517 rule->flags = frh->flags;
Patrick McHardy9e762a42006-08-10 23:09:48 -0700518 rule->table = frh_get_table(frh, tb);
Stefan Tomanek73f56982013-08-03 14:14:43 +0200519 if (tb[FRA_SUPPRESS_PREFIXLEN])
520 rule->suppress_prefixlen = nla_get_u32(tb[FRA_SUPPRESS_PREFIXLEN]);
521 else
522 rule->suppress_prefixlen = -1;
Thomas Graf14c0b972006-08-04 03:38:38 -0700523
Stefan Tomanek6ef94cf2013-08-02 17:19:56 +0200524 if (tb[FRA_SUPPRESS_IFGROUP])
525 rule->suppress_ifgroup = nla_get_u32(tb[FRA_SUPPRESS_IFGROUP]);
Stefan Tomanek73f56982013-08-03 14:14:43 +0200526 else
527 rule->suppress_ifgroup = -1;
Stefan Tomanek6ef94cf2013-08-02 17:19:56 +0200528
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700529 if (tb[FRA_GOTO]) {
530 if (rule->action != FR_ACT_GOTO)
531 goto errout_free;
532
533 rule->target = nla_get_u32(tb[FRA_GOTO]);
534 /* Backward jumps are prohibited to avoid endless loops */
535 if (rule->target <= rule->pref)
536 goto errout_free;
537
Denis V. Lunev76c72d42007-09-16 15:44:27 -0700538 list_for_each_entry(r, &ops->rules_list, list) {
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700539 if (r->pref == rule->target) {
Eric Dumazet7a2b03c2010-10-26 09:24:55 +0000540 RCU_INIT_POINTER(rule->ctarget, r);
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700541 break;
542 }
543 }
544
Eric Dumazet7a2b03c2010-10-26 09:24:55 +0000545 if (rcu_dereference_protected(rule->ctarget, 1) == NULL)
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700546 unresolved = 1;
547 } else if (rule->action == FR_ACT_GOTO)
548 goto errout_free;
549
David Ahern96c63fa2016-06-08 10:55:39 -0700550 if (rule->l3mdev && rule->table)
551 goto errout_free;
552
Lorenzo Colitti622ec2c2016-11-04 02:23:42 +0900553 if (tb[FRA_UID_RANGE]) {
554 if (current_user_ns() != net->user_ns) {
555 err = -EPERM;
556 goto errout_free;
557 }
558
559 rule->uid_range = nla_get_kuid_range(tb);
560
561 if (!uid_range_set(&rule->uid_range) ||
562 !uid_lte(rule->uid_range.start, rule->uid_range.end))
563 goto errout_free;
564 } else {
565 rule->uid_range = fib_kuid_range_unset;
566 }
567
Mateusz Bajorski153380e2016-06-29 09:22:10 +0200568 if ((nlh->nlmsg_flags & NLM_F_EXCL) &&
569 rule_exists(ops, frh, tb, rule)) {
570 err = -EEXIST;
571 goto errout_free;
572 }
573
Rami Rosen8b3521e2009-05-11 05:52:49 +0000574 err = ops->configure(rule, skb, frh, tb);
Thomas Graf14c0b972006-08-04 03:38:38 -0700575 if (err < 0)
576 goto errout_free;
577
Denis V. Lunev76c72d42007-09-16 15:44:27 -0700578 list_for_each_entry(r, &ops->rules_list, list) {
Thomas Graf14c0b972006-08-04 03:38:38 -0700579 if (r->pref > rule->pref)
580 break;
581 last = r;
582 }
583
Eric Dumazetebb9fed2010-10-23 09:44:25 +0000584 if (last)
585 list_add_rcu(&rule->list, &last->list);
586 else
587 list_add_rcu(&rule->list, &ops->rules_list);
588
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700589 if (ops->unresolved_rules) {
590 /*
591 * There are unresolved goto rules in the list, check if
592 * any of them are pointing to this new rule.
593 */
Denis V. Lunev76c72d42007-09-16 15:44:27 -0700594 list_for_each_entry(r, &ops->rules_list, list) {
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700595 if (r->action == FR_ACT_GOTO &&
Gao feng561dac22011-09-11 15:36:05 +0000596 r->target == rule->pref &&
597 rtnl_dereference(r->ctarget) == NULL) {
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700598 rcu_assign_pointer(r->ctarget, rule);
599 if (--ops->unresolved_rules == 0)
600 break;
601 }
602 }
603 }
604
605 if (rule->action == FR_ACT_GOTO)
606 ops->nr_goto_rules++;
607
608 if (unresolved)
609 ops->unresolved_rules++;
610
Thomas Grafe7030872015-07-21 10:44:01 +0200611 if (rule->tun_id)
612 ip_tunnel_need_metadata();
613
David Ahern6c31e5a2017-10-27 17:37:13 -0700614 call_fib_rule_notifiers(net, FIB_EVENT_RULE_ADD, rule, ops, extack);
Eric W. Biederman15e47302012-09-07 20:12:54 +0000615 notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).portid);
Thomas Graf73417f62007-03-27 13:56:52 -0700616 flush_route_cache(ops);
Thomas Graf14c0b972006-08-04 03:38:38 -0700617 rules_ops_put(ops);
618 return 0;
619
620errout_free:
621 kfree(rule);
622errout:
623 rules_ops_put(ops);
624 return err;
625}
David Ahern96c63fa2016-06-08 10:55:39 -0700626EXPORT_SYMBOL_GPL(fib_nl_newrule);
Thomas Graf14c0b972006-08-04 03:38:38 -0700627
David Ahernc21ef3e2017-04-16 09:48:24 -0700628int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
629 struct netlink_ext_ack *extack)
Thomas Graf14c0b972006-08-04 03:38:38 -0700630{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900631 struct net *net = sock_net(skb->sk);
Thomas Graf14c0b972006-08-04 03:38:38 -0700632 struct fib_rule_hdr *frh = nlmsg_data(nlh);
633 struct fib_rules_ops *ops = NULL;
Serhey Popovychbdaf32c2017-06-16 15:44:47 +0300634 struct fib_rule *rule, *r;
Thomas Graf14c0b972006-08-04 03:38:38 -0700635 struct nlattr *tb[FRA_MAX+1];
Lorenzo Colitti622ec2c2016-11-04 02:23:42 +0900636 struct fib_kuid_range range;
Thomas Graf14c0b972006-08-04 03:38:38 -0700637 int err = -EINVAL;
638
639 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
640 goto errout;
641
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800642 ops = lookup_rules_ops(net, frh->family);
Thomas Graf14c0b972006-08-04 03:38:38 -0700643 if (ops == NULL) {
Patrick McHardy2fe195c2008-07-01 19:59:37 -0700644 err = -EAFNOSUPPORT;
Thomas Graf14c0b972006-08-04 03:38:38 -0700645 goto errout;
646 }
647
David Ahernc21ef3e2017-04-16 09:48:24 -0700648 err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy, extack);
Thomas Graf14c0b972006-08-04 03:38:38 -0700649 if (err < 0)
650 goto errout;
651
Thomas Grafe1701c62007-03-24 12:46:02 -0700652 err = validate_rulemsg(frh, tb, ops);
653 if (err < 0)
654 goto errout;
655
Lorenzo Colitti622ec2c2016-11-04 02:23:42 +0900656 if (tb[FRA_UID_RANGE]) {
657 range = nla_get_kuid_range(tb);
Wei Yongjunadeb45c2017-04-26 14:03:50 +0000658 if (!uid_range_set(&range)) {
659 err = -EINVAL;
Lorenzo Colitti622ec2c2016-11-04 02:23:42 +0900660 goto errout;
Wei Yongjunadeb45c2017-04-26 14:03:50 +0000661 }
Lorenzo Colitti622ec2c2016-11-04 02:23:42 +0900662 } else {
663 range = fib_kuid_range_unset;
664 }
665
Denis V. Lunev76c72d42007-09-16 15:44:27 -0700666 list_for_each_entry(rule, &ops->rules_list, list) {
Thomas Graf14c0b972006-08-04 03:38:38 -0700667 if (frh->action && (frh->action != rule->action))
668 continue;
669
Andreas Henriksson13eb2ab2013-11-07 18:26:38 +0100670 if (frh_get_table(frh, tb) &&
671 (frh_get_table(frh, tb) != rule->table))
Thomas Graf14c0b972006-08-04 03:38:38 -0700672 continue;
673
674 if (tb[FRA_PRIORITY] &&
675 (rule->pref != nla_get_u32(tb[FRA_PRIORITY])))
676 continue;
677
Patrick McHardy491deb22009-12-03 01:25:54 +0000678 if (tb[FRA_IIFNAME] &&
679 nla_strcmp(tb[FRA_IIFNAME], rule->iifname))
Thomas Graf14c0b972006-08-04 03:38:38 -0700680 continue;
681
Patrick McHardy1b038a52009-12-03 01:25:56 +0000682 if (tb[FRA_OIFNAME] &&
683 nla_strcmp(tb[FRA_OIFNAME], rule->oifname))
684 continue;
685
Thomas Grafb8964ed2006-11-09 15:22:18 -0800686 if (tb[FRA_FWMARK] &&
687 (rule->mark != nla_get_u32(tb[FRA_FWMARK])))
688 continue;
689
690 if (tb[FRA_FWMASK] &&
691 (rule->mark_mask != nla_get_u32(tb[FRA_FWMASK])))
692 continue;
693
Thomas Grafe7030872015-07-21 10:44:01 +0200694 if (tb[FRA_TUN_ID] &&
695 (rule->tun_id != nla_get_be64(tb[FRA_TUN_ID])))
696 continue;
697
David Ahern96c63fa2016-06-08 10:55:39 -0700698 if (tb[FRA_L3MDEV] &&
699 (rule->l3mdev != nla_get_u8(tb[FRA_L3MDEV])))
700 continue;
701
Lorenzo Colitti622ec2c2016-11-04 02:23:42 +0900702 if (uid_range_set(&range) &&
703 (!uid_eq(rule->uid_range.start, range.start) ||
704 !uid_eq(rule->uid_range.end, range.end)))
705 continue;
706
Thomas Graf14c0b972006-08-04 03:38:38 -0700707 if (!ops->compare(rule, frh, tb))
708 continue;
709
710 if (rule->flags & FIB_RULE_PERMANENT) {
711 err = -EPERM;
712 goto errout;
713 }
714
Alexander Duyck0ddcf432015-03-06 13:47:00 -0800715 if (ops->delete) {
716 err = ops->delete(rule);
717 if (err)
718 goto errout;
719 }
720
Thomas Grafe7030872015-07-21 10:44:01 +0200721 if (rule->tun_id)
722 ip_tunnel_unneed_metadata();
723
Thomas Graf14c0b972006-08-04 03:38:38 -0700724 list_del_rcu(&rule->list);
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700725
Yan, Zhengafaef732011-10-17 15:20:28 +0000726 if (rule->action == FR_ACT_GOTO) {
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700727 ops->nr_goto_rules--;
Yan, Zhengafaef732011-10-17 15:20:28 +0000728 if (rtnl_dereference(rule->ctarget) == NULL)
729 ops->unresolved_rules--;
730 }
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700731
732 /*
733 * Check if this rule is a target to any of them. If so,
Serhey Popovychbdaf32c2017-06-16 15:44:47 +0300734 * adjust to the next one with the same preference or
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700735 * disable them. As this operation is eventually very
Serhey Popovychbdaf32c2017-06-16 15:44:47 +0300736 * expensive, it is only performed if goto rules, except
737 * current if it is goto rule, have actually been added.
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700738 */
739 if (ops->nr_goto_rules > 0) {
Serhey Popovychbdaf32c2017-06-16 15:44:47 +0300740 struct fib_rule *n;
741
742 n = list_next_entry(rule, list);
743 if (&n->list == &ops->rules_list || n->pref != rule->pref)
744 n = NULL;
745 list_for_each_entry(r, &ops->rules_list, list) {
746 if (rtnl_dereference(r->ctarget) != rule)
747 continue;
748 rcu_assign_pointer(r->ctarget, n);
749 if (!n)
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700750 ops->unresolved_rules++;
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700751 }
752 }
753
David Ahern6c31e5a2017-10-27 17:37:13 -0700754 call_fib_rule_notifiers(net, FIB_EVENT_RULE_DEL, rule, ops,
755 NULL);
Denis V. Lunev9e3a5482008-01-20 16:46:41 -0800756 notify_rule_change(RTM_DELRULE, rule, ops, nlh,
Eric W. Biederman15e47302012-09-07 20:12:54 +0000757 NETLINK_CB(skb).portid);
Thomas Graf14c0b972006-08-04 03:38:38 -0700758 fib_rule_put(rule);
Thomas Graf73417f62007-03-27 13:56:52 -0700759 flush_route_cache(ops);
Thomas Graf14c0b972006-08-04 03:38:38 -0700760 rules_ops_put(ops);
761 return 0;
762 }
763
764 err = -ENOENT;
765errout:
766 rules_ops_put(ops);
767 return err;
768}
David Ahern96c63fa2016-06-08 10:55:39 -0700769EXPORT_SYMBOL_GPL(fib_nl_delrule);
Thomas Graf14c0b972006-08-04 03:38:38 -0700770
Thomas Graf339bf982006-11-10 14:10:15 -0800771static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
772 struct fib_rule *rule)
773{
774 size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
Patrick McHardy491deb22009-12-03 01:25:54 +0000775 + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */
Patrick McHardy1b038a52009-12-03 01:25:56 +0000776 + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */
Thomas Graf339bf982006-11-10 14:10:15 -0800777 + nla_total_size(4) /* FRA_PRIORITY */
778 + nla_total_size(4) /* FRA_TABLE */
Stefan Tomanek73f56982013-08-03 14:14:43 +0200779 + nla_total_size(4) /* FRA_SUPPRESS_PREFIXLEN */
Stefan Tomanek6ef94cf2013-08-02 17:19:56 +0200780 + nla_total_size(4) /* FRA_SUPPRESS_IFGROUP */
Thomas Graf339bf982006-11-10 14:10:15 -0800781 + nla_total_size(4) /* FRA_FWMARK */
Thomas Grafe7030872015-07-21 10:44:01 +0200782 + nla_total_size(4) /* FRA_FWMASK */
Lorenzo Colitti622ec2c2016-11-04 02:23:42 +0900783 + nla_total_size_64bit(8) /* FRA_TUN_ID */
784 + nla_total_size(sizeof(struct fib_kuid_range));
Thomas Graf339bf982006-11-10 14:10:15 -0800785
786 if (ops->nlmsg_payload)
787 payload += ops->nlmsg_payload(rule);
788
789 return payload;
790}
791
Thomas Graf14c0b972006-08-04 03:38:38 -0700792static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
793 u32 pid, u32 seq, int type, int flags,
794 struct fib_rules_ops *ops)
795{
796 struct nlmsghdr *nlh;
797 struct fib_rule_hdr *frh;
798
799 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
800 if (nlh == NULL)
Patrick McHardy26932562007-01-31 23:16:40 -0800801 return -EMSGSIZE;
Thomas Graf14c0b972006-08-04 03:38:38 -0700802
803 frh = nlmsg_data(nlh);
Patrick McHardy28bb1722010-04-13 05:03:16 +0000804 frh->family = ops->family;
Thomas Graf14c0b972006-08-04 03:38:38 -0700805 frh->table = rule->table;
David S. Miller0e3cea72012-04-01 20:47:01 -0400806 if (nla_put_u32(skb, FRA_TABLE, rule->table))
807 goto nla_put_failure;
Stefan Tomanek73f56982013-08-03 14:14:43 +0200808 if (nla_put_u32(skb, FRA_SUPPRESS_PREFIXLEN, rule->suppress_prefixlen))
Stefan Tomanek7764a452013-08-01 02:17:15 +0200809 goto nla_put_failure;
Thomas Graf14c0b972006-08-04 03:38:38 -0700810 frh->res1 = 0;
811 frh->res2 = 0;
812 frh->action = rule->action;
813 frh->flags = rule->flags;
814
Eric Dumazet7a2b03c2010-10-26 09:24:55 +0000815 if (rule->action == FR_ACT_GOTO &&
Eric Dumazet33d480c2011-08-11 19:30:52 +0000816 rcu_access_pointer(rule->ctarget) == NULL)
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700817 frh->flags |= FIB_RULE_UNRESOLVED;
818
Patrick McHardy491deb22009-12-03 01:25:54 +0000819 if (rule->iifname[0]) {
David S. Miller0e3cea72012-04-01 20:47:01 -0400820 if (nla_put_string(skb, FRA_IIFNAME, rule->iifname))
821 goto nla_put_failure;
Patrick McHardy491deb22009-12-03 01:25:54 +0000822 if (rule->iifindex == -1)
823 frh->flags |= FIB_RULE_IIF_DETACHED;
Thomas Graf2b443682007-03-26 17:37:59 -0700824 }
825
Patrick McHardy1b038a52009-12-03 01:25:56 +0000826 if (rule->oifname[0]) {
David S. Miller0e3cea72012-04-01 20:47:01 -0400827 if (nla_put_string(skb, FRA_OIFNAME, rule->oifname))
828 goto nla_put_failure;
Patrick McHardy1b038a52009-12-03 01:25:56 +0000829 if (rule->oifindex == -1)
830 frh->flags |= FIB_RULE_OIF_DETACHED;
831 }
832
David S. Miller0e3cea72012-04-01 20:47:01 -0400833 if ((rule->pref &&
834 nla_put_u32(skb, FRA_PRIORITY, rule->pref)) ||
835 (rule->mark &&
836 nla_put_u32(skb, FRA_FWMARK, rule->mark)) ||
837 ((rule->mark_mask || rule->mark) &&
838 nla_put_u32(skb, FRA_FWMASK, rule->mark_mask)) ||
839 (rule->target &&
Thomas Grafe7030872015-07-21 10:44:01 +0200840 nla_put_u32(skb, FRA_GOTO, rule->target)) ||
841 (rule->tun_id &&
David Ahern96c63fa2016-06-08 10:55:39 -0700842 nla_put_be64(skb, FRA_TUN_ID, rule->tun_id, FRA_PAD)) ||
843 (rule->l3mdev &&
Lorenzo Colitti622ec2c2016-11-04 02:23:42 +0900844 nla_put_u8(skb, FRA_L3MDEV, rule->l3mdev)) ||
845 (uid_range_set(&rule->uid_range) &&
846 nla_put_uid_range(skb, &rule->uid_range)))
David S. Miller0e3cea72012-04-01 20:47:01 -0400847 goto nla_put_failure;
Stefan Tomanek6ef94cf2013-08-02 17:19:56 +0200848
849 if (rule->suppress_ifgroup != -1) {
850 if (nla_put_u32(skb, FRA_SUPPRESS_IFGROUP, rule->suppress_ifgroup))
851 goto nla_put_failure;
852 }
853
Rami Rosen04af8cf2009-05-20 17:26:23 -0700854 if (ops->fill(rule, skb, frh) < 0)
Thomas Graf14c0b972006-08-04 03:38:38 -0700855 goto nla_put_failure;
856
Johannes Berg053c0952015-01-16 22:09:00 +0100857 nlmsg_end(skb, nlh);
858 return 0;
Thomas Graf14c0b972006-08-04 03:38:38 -0700859
860nla_put_failure:
Patrick McHardy26932562007-01-31 23:16:40 -0800861 nlmsg_cancel(skb, nlh);
862 return -EMSGSIZE;
Thomas Graf14c0b972006-08-04 03:38:38 -0700863}
864
Thomas Grafc4546732007-03-25 23:24:24 -0700865static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
866 struct fib_rules_ops *ops)
Thomas Graf14c0b972006-08-04 03:38:38 -0700867{
868 int idx = 0;
869 struct fib_rule *rule;
Wilson Kok41fc0142015-09-22 21:40:22 -0700870 int err = 0;
Thomas Graf14c0b972006-08-04 03:38:38 -0700871
Eric Dumazete67f88d2011-04-27 22:56:07 +0000872 rcu_read_lock();
873 list_for_each_entry_rcu(rule, &ops->rules_list, list) {
Thomas Grafc4546732007-03-25 23:24:24 -0700874 if (idx < cb->args[1])
Thomas Graf14c0b972006-08-04 03:38:38 -0700875 goto skip;
876
Wilson Kok41fc0142015-09-22 21:40:22 -0700877 err = fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).portid,
878 cb->nlh->nlmsg_seq, RTM_NEWRULE,
879 NLM_F_MULTI, ops);
880 if (err)
Thomas Graf14c0b972006-08-04 03:38:38 -0700881 break;
882skip:
883 idx++;
884 }
Eric Dumazet2907c352011-05-25 07:34:04 +0000885 rcu_read_unlock();
Thomas Grafc4546732007-03-25 23:24:24 -0700886 cb->args[1] = idx;
Thomas Graf14c0b972006-08-04 03:38:38 -0700887 rules_ops_put(ops);
888
Wilson Kok41fc0142015-09-22 21:40:22 -0700889 return err;
Thomas Graf14c0b972006-08-04 03:38:38 -0700890}
891
Thomas Grafc4546732007-03-25 23:24:24 -0700892static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb)
893{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900894 struct net *net = sock_net(skb->sk);
Thomas Grafc4546732007-03-25 23:24:24 -0700895 struct fib_rules_ops *ops;
896 int idx = 0, family;
897
898 family = rtnl_msg_family(cb->nlh);
899 if (family != AF_UNSPEC) {
900 /* Protocol specific dump request */
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800901 ops = lookup_rules_ops(net, family);
Thomas Grafc4546732007-03-25 23:24:24 -0700902 if (ops == NULL)
903 return -EAFNOSUPPORT;
904
Wilson Kok41fc0142015-09-22 21:40:22 -0700905 dump_rules(skb, cb, ops);
906
907 return skb->len;
Thomas Grafc4546732007-03-25 23:24:24 -0700908 }
909
910 rcu_read_lock();
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800911 list_for_each_entry_rcu(ops, &net->rules_ops, list) {
Thomas Grafc4546732007-03-25 23:24:24 -0700912 if (idx < cb->args[0] || !try_module_get(ops->owner))
913 goto skip;
914
915 if (dump_rules(skb, cb, ops) < 0)
916 break;
917
918 cb->args[1] = 0;
Eric Dumazet2fb35732010-03-09 20:03:38 +0000919skip:
Thomas Grafc4546732007-03-25 23:24:24 -0700920 idx++;
921 }
922 rcu_read_unlock();
923 cb->args[0] = idx;
924
925 return skb->len;
926}
Thomas Graf14c0b972006-08-04 03:38:38 -0700927
Denis V. Lunev9e3a5482008-01-20 16:46:41 -0800928static void notify_rule_change(int event, struct fib_rule *rule,
Thomas Grafc17084d2006-08-15 00:32:48 -0700929 struct fib_rules_ops *ops, struct nlmsghdr *nlh,
930 u32 pid)
Thomas Graf14c0b972006-08-04 03:38:38 -0700931{
Denis V. Lunev9e3a5482008-01-20 16:46:41 -0800932 struct net *net;
Thomas Grafc17084d2006-08-15 00:32:48 -0700933 struct sk_buff *skb;
934 int err = -ENOBUFS;
Thomas Graf14c0b972006-08-04 03:38:38 -0700935
Denis V. Lunev9e3a5482008-01-20 16:46:41 -0800936 net = ops->fro_net;
Thomas Graf339bf982006-11-10 14:10:15 -0800937 skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
Thomas Graf14c0b972006-08-04 03:38:38 -0700938 if (skb == NULL)
Thomas Grafc17084d2006-08-15 00:32:48 -0700939 goto errout;
940
941 err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
Patrick McHardy26932562007-01-31 23:16:40 -0800942 if (err < 0) {
943 /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */
944 WARN_ON(err == -EMSGSIZE);
945 kfree_skb(skb);
946 goto errout;
947 }
Denis V. Lunev9e3a5482008-01-20 16:46:41 -0800948
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -0800949 rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
950 return;
Thomas Grafc17084d2006-08-15 00:32:48 -0700951errout:
952 if (err < 0)
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800953 rtnl_set_sk_err(net, ops->nlgroup, err);
Thomas Graf14c0b972006-08-04 03:38:38 -0700954}
955
956static void attach_rules(struct list_head *rules, struct net_device *dev)
957{
958 struct fib_rule *rule;
959
960 list_for_each_entry(rule, rules, list) {
Patrick McHardy491deb22009-12-03 01:25:54 +0000961 if (rule->iifindex == -1 &&
962 strcmp(dev->name, rule->iifname) == 0)
963 rule->iifindex = dev->ifindex;
Patrick McHardy1b038a52009-12-03 01:25:56 +0000964 if (rule->oifindex == -1 &&
965 strcmp(dev->name, rule->oifname) == 0)
966 rule->oifindex = dev->ifindex;
Thomas Graf14c0b972006-08-04 03:38:38 -0700967 }
968}
969
970static void detach_rules(struct list_head *rules, struct net_device *dev)
971{
972 struct fib_rule *rule;
973
Patrick McHardy1b038a52009-12-03 01:25:56 +0000974 list_for_each_entry(rule, rules, list) {
Patrick McHardy491deb22009-12-03 01:25:54 +0000975 if (rule->iifindex == dev->ifindex)
976 rule->iifindex = -1;
Patrick McHardy1b038a52009-12-03 01:25:56 +0000977 if (rule->oifindex == dev->ifindex)
978 rule->oifindex = -1;
979 }
Thomas Graf14c0b972006-08-04 03:38:38 -0700980}
981
982
983static int fib_rules_event(struct notifier_block *this, unsigned long event,
Jiri Pirko351638e2013-05-28 01:30:21 +0000984 void *ptr)
Thomas Graf14c0b972006-08-04 03:38:38 -0700985{
Jiri Pirko351638e2013-05-28 01:30:21 +0000986 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900987 struct net *net = dev_net(dev);
Thomas Graf14c0b972006-08-04 03:38:38 -0700988 struct fib_rules_ops *ops;
989
Eric Dumazet748e2d92012-08-22 21:50:59 +0000990 ASSERT_RTNL();
Thomas Graf14c0b972006-08-04 03:38:38 -0700991
992 switch (event) {
993 case NETDEV_REGISTER:
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800994 list_for_each_entry(ops, &net->rules_ops, list)
Denis V. Lunev76c72d42007-09-16 15:44:27 -0700995 attach_rules(&ops->rules_list, dev);
Thomas Graf14c0b972006-08-04 03:38:38 -0700996 break;
997
Maciej Żenczykowski946c0322014-02-07 16:23:48 -0800998 case NETDEV_CHANGENAME:
999 list_for_each_entry(ops, &net->rules_ops, list) {
1000 detach_rules(&ops->rules_list, dev);
1001 attach_rules(&ops->rules_list, dev);
1002 }
1003 break;
1004
Thomas Graf14c0b972006-08-04 03:38:38 -07001005 case NETDEV_UNREGISTER:
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -08001006 list_for_each_entry(ops, &net->rules_ops, list)
Denis V. Lunev76c72d42007-09-16 15:44:27 -07001007 detach_rules(&ops->rules_list, dev);
Thomas Graf14c0b972006-08-04 03:38:38 -07001008 break;
1009 }
1010
Thomas Graf14c0b972006-08-04 03:38:38 -07001011 return NOTIFY_DONE;
1012}
1013
1014static struct notifier_block fib_rules_notifier = {
1015 .notifier_call = fib_rules_event,
1016};
1017
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001018static int __net_init fib_rules_net_init(struct net *net)
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -08001019{
1020 INIT_LIST_HEAD(&net->rules_ops);
1021 spin_lock_init(&net->rules_mod_lock);
1022 return 0;
1023}
1024
Vasily Averince2b7db2017-11-12 22:30:01 +03001025static void __net_exit fib_rules_net_exit(struct net *net)
1026{
1027 WARN_ON_ONCE(!list_empty(&net->rules_ops));
1028}
1029
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -08001030static struct pernet_operations fib_rules_net_ops = {
1031 .init = fib_rules_net_init,
Vasily Averince2b7db2017-11-12 22:30:01 +03001032 .exit = fib_rules_net_exit,
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -08001033};
1034
Thomas Graf14c0b972006-08-04 03:38:38 -07001035static int __init fib_rules_init(void)
1036{
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -08001037 int err;
Florian Westphalb97bac62017-08-09 20:41:48 +02001038 rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL, 0);
1039 rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL, 0);
1040 rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule, 0);
Thomas Graf9d9e6a52007-03-25 23:20:05 -07001041
Eric W. Biederman5d6d4802008-11-07 22:52:34 -08001042 err = register_pernet_subsys(&fib_rules_net_ops);
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -08001043 if (err < 0)
1044 goto fail;
1045
Eric W. Biederman5d6d4802008-11-07 22:52:34 -08001046 err = register_netdevice_notifier(&fib_rules_notifier);
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -08001047 if (err < 0)
1048 goto fail_unregister;
Eric W. Biederman5d6d4802008-11-07 22:52:34 -08001049
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -08001050 return 0;
1051
1052fail_unregister:
Eric W. Biederman5d6d4802008-11-07 22:52:34 -08001053 unregister_pernet_subsys(&fib_rules_net_ops);
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -08001054fail:
1055 rtnl_unregister(PF_UNSPEC, RTM_NEWRULE);
1056 rtnl_unregister(PF_UNSPEC, RTM_DELRULE);
1057 rtnl_unregister(PF_UNSPEC, RTM_GETRULE);
1058 return err;
Thomas Graf14c0b972006-08-04 03:38:38 -07001059}
1060
1061subsys_initcall(fib_rules_init);