blob: 98691e1466b80699b664983e5403b4b1a3a19db2 [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>
13#include <linux/list.h>
Eric W. Biedermane9dc8652007-09-12 13:02:17 +020014#include <net/net_namespace.h>
Eric W. Biederman881d9662007-09-17 11:56:21 -070015#include <net/sock.h>
Thomas Graf14c0b972006-08-04 03:38:38 -070016#include <net/fib_rules.h>
17
Denis V. Lunev2994c632007-11-10 22:12:03 -080018int fib_default_rule_add(struct fib_rules_ops *ops,
19 u32 pref, u32 table, u32 flags)
20{
21 struct fib_rule *r;
22
23 r = kzalloc(ops->rule_size, GFP_KERNEL);
24 if (r == NULL)
25 return -ENOMEM;
26
27 atomic_set(&r->refcnt, 1);
28 r->action = FR_ACT_TO_TBL;
29 r->pref = pref;
30 r->table = table;
31 r->flags = flags;
Denis V. Lunev3661a912008-04-16 02:01:56 -070032 r->fr_net = hold_net(ops->fro_net);
Denis V. Lunev2994c632007-11-10 22:12:03 -080033
34 /* The lock is not required here, the list in unreacheable
35 * at the moment this function is called */
36 list_add_tail(&r->list, &ops->rules_list);
37 return 0;
38}
39EXPORT_SYMBOL(fib_default_rule_add);
40
Denis V. Lunev9e3a5482008-01-20 16:46:41 -080041static void notify_rule_change(int event, struct fib_rule *rule,
Thomas Grafc17084d2006-08-15 00:32:48 -070042 struct fib_rules_ops *ops, struct nlmsghdr *nlh,
43 u32 pid);
Thomas Graf14c0b972006-08-04 03:38:38 -070044
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -080045static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family)
Thomas Graf14c0b972006-08-04 03:38:38 -070046{
47 struct fib_rules_ops *ops;
48
49 rcu_read_lock();
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -080050 list_for_each_entry_rcu(ops, &net->rules_ops, list) {
Thomas Graf14c0b972006-08-04 03:38:38 -070051 if (ops->family == family) {
52 if (!try_module_get(ops->owner))
53 ops = NULL;
54 rcu_read_unlock();
55 return ops;
56 }
57 }
58 rcu_read_unlock();
59
60 return NULL;
61}
62
63static void rules_ops_put(struct fib_rules_ops *ops)
64{
65 if (ops)
66 module_put(ops->owner);
67}
68
Thomas Graf73417f62007-03-27 13:56:52 -070069static void flush_route_cache(struct fib_rules_ops *ops)
70{
71 if (ops->flush_cache)
Denis V. Lunevae299fc2008-07-05 19:01:28 -070072 ops->flush_cache(ops);
Thomas Graf73417f62007-03-27 13:56:52 -070073}
74
Denis V. Lunev9e3a5482008-01-20 16:46:41 -080075int fib_rules_register(struct fib_rules_ops *ops)
Thomas Graf14c0b972006-08-04 03:38:38 -070076{
77 int err = -EEXIST;
78 struct fib_rules_ops *o;
Denis V. Lunev9e3a5482008-01-20 16:46:41 -080079 struct net *net;
80
81 net = ops->fro_net;
Thomas Graf14c0b972006-08-04 03:38:38 -070082
83 if (ops->rule_size < sizeof(struct fib_rule))
84 return -EINVAL;
85
86 if (ops->match == NULL || ops->configure == NULL ||
87 ops->compare == NULL || ops->fill == NULL ||
88 ops->action == NULL)
89 return -EINVAL;
90
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -080091 spin_lock(&net->rules_mod_lock);
92 list_for_each_entry(o, &net->rules_ops, list)
Thomas Graf14c0b972006-08-04 03:38:38 -070093 if (ops->family == o->family)
94 goto errout;
95
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -080096 hold_net(net);
97 list_add_tail_rcu(&ops->list, &net->rules_ops);
Thomas Graf14c0b972006-08-04 03:38:38 -070098 err = 0;
99errout:
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800100 spin_unlock(&net->rules_mod_lock);
Thomas Graf14c0b972006-08-04 03:38:38 -0700101
102 return err;
103}
104
105EXPORT_SYMBOL_GPL(fib_rules_register);
106
Daniel Lezcano9eb87f32007-12-07 00:42:52 -0800107void fib_rules_cleanup_ops(struct fib_rules_ops *ops)
Thomas Graf14c0b972006-08-04 03:38:38 -0700108{
109 struct fib_rule *rule, *tmp;
110
Denis V. Lunev76c72d42007-09-16 15:44:27 -0700111 list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) {
Thomas Graf14c0b972006-08-04 03:38:38 -0700112 list_del_rcu(&rule->list);
113 fib_rule_put(rule);
114 }
115}
Daniel Lezcano9eb87f32007-12-07 00:42:52 -0800116EXPORT_SYMBOL_GPL(fib_rules_cleanup_ops);
Thomas Graf14c0b972006-08-04 03:38:38 -0700117
Denis V. Lunev9e3a5482008-01-20 16:46:41 -0800118void fib_rules_unregister(struct fib_rules_ops *ops)
Thomas Graf14c0b972006-08-04 03:38:38 -0700119{
Denis V. Lunev9e3a5482008-01-20 16:46:41 -0800120 struct net *net = ops->fro_net;
Thomas Graf14c0b972006-08-04 03:38:38 -0700121
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800122 spin_lock(&net->rules_mod_lock);
Denis V. Lunev72132c1b2008-01-14 22:59:30 -0800123 list_del_rcu(&ops->list);
124 fib_rules_cleanup_ops(ops);
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800125 spin_unlock(&net->rules_mod_lock);
Thomas Graf14c0b972006-08-04 03:38:38 -0700126
127 synchronize_rcu();
Denis V. Lunev72132c1b2008-01-14 22:59:30 -0800128 release_net(net);
Thomas Graf14c0b972006-08-04 03:38:38 -0700129}
130
131EXPORT_SYMBOL_GPL(fib_rules_unregister);
132
Thomas Graf3dfbcc42006-11-09 15:23:20 -0800133static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
134 struct flowi *fl, int flags)
135{
136 int ret = 0;
137
138 if (rule->ifindex && (rule->ifindex != fl->iif))
139 goto out;
140
141 if ((rule->mark ^ fl->mark) & rule->mark_mask)
142 goto out;
143
144 ret = ops->match(rule, fl, flags);
145out:
146 return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
147}
148
Thomas Graf14c0b972006-08-04 03:38:38 -0700149int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl,
150 int flags, struct fib_lookup_arg *arg)
151{
152 struct fib_rule *rule;
153 int err;
154
155 rcu_read_lock();
156
Denis V. Lunev76c72d42007-09-16 15:44:27 -0700157 list_for_each_entry_rcu(rule, &ops->rules_list, list) {
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700158jumped:
Thomas Graf3dfbcc42006-11-09 15:23:20 -0800159 if (!fib_rule_match(rule, ops, fl, flags))
Thomas Graf14c0b972006-08-04 03:38:38 -0700160 continue;
161
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700162 if (rule->action == FR_ACT_GOTO) {
163 struct fib_rule *target;
164
165 target = rcu_dereference(rule->ctarget);
166 if (target == NULL) {
167 continue;
168 } else {
169 rule = target;
170 goto jumped;
171 }
Thomas Graffa0b2d12007-03-26 17:38:53 -0700172 } else if (rule->action == FR_ACT_NOP)
173 continue;
174 else
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700175 err = ops->action(rule, fl, flags, arg);
176
Thomas Graf14c0b972006-08-04 03:38:38 -0700177 if (err != -EAGAIN) {
178 fib_rule_get(rule);
179 arg->rule = rule;
180 goto out;
181 }
182 }
183
Steven Whitehouse83886b62007-03-30 13:34:27 -0700184 err = -ESRCH;
Thomas Graf14c0b972006-08-04 03:38:38 -0700185out:
186 rcu_read_unlock();
187
188 return err;
189}
190
191EXPORT_SYMBOL_GPL(fib_rules_lookup);
192
Thomas Grafe1701c62007-03-24 12:46:02 -0700193static int validate_rulemsg(struct fib_rule_hdr *frh, struct nlattr **tb,
194 struct fib_rules_ops *ops)
195{
196 int err = -EINVAL;
197
198 if (frh->src_len)
199 if (tb[FRA_SRC] == NULL ||
200 frh->src_len > (ops->addr_size * 8) ||
201 nla_len(tb[FRA_SRC]) != ops->addr_size)
202 goto errout;
203
204 if (frh->dst_len)
205 if (tb[FRA_DST] == NULL ||
206 frh->dst_len > (ops->addr_size * 8) ||
207 nla_len(tb[FRA_DST]) != ops->addr_size)
208 goto errout;
209
210 err = 0;
211errout:
212 return err;
213}
214
Thomas Graf9d9e6a52007-03-25 23:20:05 -0700215static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
Thomas Graf14c0b972006-08-04 03:38:38 -0700216{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900217 struct net *net = sock_net(skb->sk);
Thomas Graf14c0b972006-08-04 03:38:38 -0700218 struct fib_rule_hdr *frh = nlmsg_data(nlh);
219 struct fib_rules_ops *ops = NULL;
220 struct fib_rule *rule, *r, *last = NULL;
221 struct nlattr *tb[FRA_MAX+1];
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700222 int err = -EINVAL, unresolved = 0;
Thomas Graf14c0b972006-08-04 03:38:38 -0700223
224 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
225 goto errout;
226
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800227 ops = lookup_rules_ops(net, frh->family);
Thomas Graf14c0b972006-08-04 03:38:38 -0700228 if (ops == NULL) {
Patrick McHardy2fe195c2008-07-01 19:59:37 -0700229 err = -EAFNOSUPPORT;
Thomas Graf14c0b972006-08-04 03:38:38 -0700230 goto errout;
231 }
232
233 err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
234 if (err < 0)
235 goto errout;
236
Thomas Grafe1701c62007-03-24 12:46:02 -0700237 err = validate_rulemsg(frh, tb, ops);
238 if (err < 0)
239 goto errout;
240
Thomas Graf14c0b972006-08-04 03:38:38 -0700241 rule = kzalloc(ops->rule_size, GFP_KERNEL);
242 if (rule == NULL) {
243 err = -ENOMEM;
244 goto errout;
245 }
Denis V. Lunev3661a912008-04-16 02:01:56 -0700246 rule->fr_net = hold_net(net);
Thomas Graf14c0b972006-08-04 03:38:38 -0700247
248 if (tb[FRA_PRIORITY])
249 rule->pref = nla_get_u32(tb[FRA_PRIORITY]);
250
251 if (tb[FRA_IFNAME]) {
252 struct net_device *dev;
253
254 rule->ifindex = -1;
Thomas Graf5176f912006-08-26 20:13:18 -0700255 nla_strlcpy(rule->ifname, tb[FRA_IFNAME], IFNAMSIZ);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700256 dev = __dev_get_by_name(net, rule->ifname);
Thomas Graf14c0b972006-08-04 03:38:38 -0700257 if (dev)
258 rule->ifindex = dev->ifindex;
259 }
260
Thomas Grafb8964ed2006-11-09 15:22:18 -0800261 if (tb[FRA_FWMARK]) {
262 rule->mark = nla_get_u32(tb[FRA_FWMARK]);
263 if (rule->mark)
264 /* compatibility: if the mark value is non-zero all bits
265 * are compared unless a mask is explicitly specified.
266 */
267 rule->mark_mask = 0xFFFFFFFF;
268 }
269
270 if (tb[FRA_FWMASK])
271 rule->mark_mask = nla_get_u32(tb[FRA_FWMASK]);
272
Thomas Graf14c0b972006-08-04 03:38:38 -0700273 rule->action = frh->action;
274 rule->flags = frh->flags;
Patrick McHardy9e762a42006-08-10 23:09:48 -0700275 rule->table = frh_get_table(frh, tb);
Thomas Graf14c0b972006-08-04 03:38:38 -0700276
277 if (!rule->pref && ops->default_pref)
Denis V. Lunev868d13a2008-01-10 03:18:25 -0800278 rule->pref = ops->default_pref(ops);
Thomas Graf14c0b972006-08-04 03:38:38 -0700279
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700280 err = -EINVAL;
281 if (tb[FRA_GOTO]) {
282 if (rule->action != FR_ACT_GOTO)
283 goto errout_free;
284
285 rule->target = nla_get_u32(tb[FRA_GOTO]);
286 /* Backward jumps are prohibited to avoid endless loops */
287 if (rule->target <= rule->pref)
288 goto errout_free;
289
Denis V. Lunev76c72d42007-09-16 15:44:27 -0700290 list_for_each_entry(r, &ops->rules_list, list) {
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700291 if (r->pref == rule->target) {
292 rule->ctarget = r;
293 break;
294 }
295 }
296
297 if (rule->ctarget == NULL)
298 unresolved = 1;
299 } else if (rule->action == FR_ACT_GOTO)
300 goto errout_free;
301
Thomas Graf14c0b972006-08-04 03:38:38 -0700302 err = ops->configure(rule, skb, nlh, frh, tb);
303 if (err < 0)
304 goto errout_free;
305
Denis V. Lunev76c72d42007-09-16 15:44:27 -0700306 list_for_each_entry(r, &ops->rules_list, list) {
Thomas Graf14c0b972006-08-04 03:38:38 -0700307 if (r->pref > rule->pref)
308 break;
309 last = r;
310 }
311
312 fib_rule_get(rule);
313
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700314 if (ops->unresolved_rules) {
315 /*
316 * There are unresolved goto rules in the list, check if
317 * any of them are pointing to this new rule.
318 */
Denis V. Lunev76c72d42007-09-16 15:44:27 -0700319 list_for_each_entry(r, &ops->rules_list, list) {
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700320 if (r->action == FR_ACT_GOTO &&
321 r->target == rule->pref) {
322 BUG_ON(r->ctarget != NULL);
323 rcu_assign_pointer(r->ctarget, rule);
324 if (--ops->unresolved_rules == 0)
325 break;
326 }
327 }
328 }
329
330 if (rule->action == FR_ACT_GOTO)
331 ops->nr_goto_rules++;
332
333 if (unresolved)
334 ops->unresolved_rules++;
335
Thomas Graf14c0b972006-08-04 03:38:38 -0700336 if (last)
337 list_add_rcu(&rule->list, &last->list);
338 else
Denis V. Lunev76c72d42007-09-16 15:44:27 -0700339 list_add_rcu(&rule->list, &ops->rules_list);
Thomas Graf14c0b972006-08-04 03:38:38 -0700340
Denis V. Lunev9e3a5482008-01-20 16:46:41 -0800341 notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).pid);
Thomas Graf73417f62007-03-27 13:56:52 -0700342 flush_route_cache(ops);
Thomas Graf14c0b972006-08-04 03:38:38 -0700343 rules_ops_put(ops);
344 return 0;
345
346errout_free:
Denis V. Lunev3661a912008-04-16 02:01:56 -0700347 release_net(rule->fr_net);
Thomas Graf14c0b972006-08-04 03:38:38 -0700348 kfree(rule);
349errout:
350 rules_ops_put(ops);
351 return err;
352}
353
Thomas Graf9d9e6a52007-03-25 23:20:05 -0700354static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
Thomas Graf14c0b972006-08-04 03:38:38 -0700355{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900356 struct net *net = sock_net(skb->sk);
Thomas Graf14c0b972006-08-04 03:38:38 -0700357 struct fib_rule_hdr *frh = nlmsg_data(nlh);
358 struct fib_rules_ops *ops = NULL;
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700359 struct fib_rule *rule, *tmp;
Thomas Graf14c0b972006-08-04 03:38:38 -0700360 struct nlattr *tb[FRA_MAX+1];
361 int err = -EINVAL;
362
363 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
364 goto errout;
365
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800366 ops = lookup_rules_ops(net, frh->family);
Thomas Graf14c0b972006-08-04 03:38:38 -0700367 if (ops == NULL) {
Patrick McHardy2fe195c2008-07-01 19:59:37 -0700368 err = -EAFNOSUPPORT;
Thomas Graf14c0b972006-08-04 03:38:38 -0700369 goto errout;
370 }
371
372 err = nlmsg_parse(nlh, sizeof(*frh), tb, FRA_MAX, ops->policy);
373 if (err < 0)
374 goto errout;
375
Thomas Grafe1701c62007-03-24 12:46:02 -0700376 err = validate_rulemsg(frh, tb, ops);
377 if (err < 0)
378 goto errout;
379
Denis V. Lunev76c72d42007-09-16 15:44:27 -0700380 list_for_each_entry(rule, &ops->rules_list, list) {
Thomas Graf14c0b972006-08-04 03:38:38 -0700381 if (frh->action && (frh->action != rule->action))
382 continue;
383
Patrick McHardy9e762a42006-08-10 23:09:48 -0700384 if (frh->table && (frh_get_table(frh, tb) != rule->table))
Thomas Graf14c0b972006-08-04 03:38:38 -0700385 continue;
386
387 if (tb[FRA_PRIORITY] &&
388 (rule->pref != nla_get_u32(tb[FRA_PRIORITY])))
389 continue;
390
391 if (tb[FRA_IFNAME] &&
392 nla_strcmp(tb[FRA_IFNAME], rule->ifname))
393 continue;
394
Thomas Grafb8964ed2006-11-09 15:22:18 -0800395 if (tb[FRA_FWMARK] &&
396 (rule->mark != nla_get_u32(tb[FRA_FWMARK])))
397 continue;
398
399 if (tb[FRA_FWMASK] &&
400 (rule->mark_mask != nla_get_u32(tb[FRA_FWMASK])))
401 continue;
402
Thomas Graf14c0b972006-08-04 03:38:38 -0700403 if (!ops->compare(rule, frh, tb))
404 continue;
405
406 if (rule->flags & FIB_RULE_PERMANENT) {
407 err = -EPERM;
408 goto errout;
409 }
410
411 list_del_rcu(&rule->list);
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700412
413 if (rule->action == FR_ACT_GOTO)
414 ops->nr_goto_rules--;
415
416 /*
417 * Check if this rule is a target to any of them. If so,
418 * disable them. As this operation is eventually very
419 * expensive, it is only performed if goto rules have
420 * actually been added.
421 */
422 if (ops->nr_goto_rules > 0) {
Denis V. Lunev76c72d42007-09-16 15:44:27 -0700423 list_for_each_entry(tmp, &ops->rules_list, list) {
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700424 if (tmp->ctarget == rule) {
425 rcu_assign_pointer(tmp->ctarget, NULL);
426 ops->unresolved_rules++;
427 }
428 }
429 }
430
Thomas Graf14c0b972006-08-04 03:38:38 -0700431 synchronize_rcu();
Denis V. Lunev9e3a5482008-01-20 16:46:41 -0800432 notify_rule_change(RTM_DELRULE, rule, ops, nlh,
Thomas Grafc17084d2006-08-15 00:32:48 -0700433 NETLINK_CB(skb).pid);
Thomas Graf14c0b972006-08-04 03:38:38 -0700434 fib_rule_put(rule);
Thomas Graf73417f62007-03-27 13:56:52 -0700435 flush_route_cache(ops);
Thomas Graf14c0b972006-08-04 03:38:38 -0700436 rules_ops_put(ops);
437 return 0;
438 }
439
440 err = -ENOENT;
441errout:
442 rules_ops_put(ops);
443 return err;
444}
445
Thomas Graf339bf982006-11-10 14:10:15 -0800446static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
447 struct fib_rule *rule)
448{
449 size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
450 + nla_total_size(IFNAMSIZ) /* FRA_IFNAME */
451 + nla_total_size(4) /* FRA_PRIORITY */
452 + nla_total_size(4) /* FRA_TABLE */
453 + nla_total_size(4) /* FRA_FWMARK */
454 + nla_total_size(4); /* FRA_FWMASK */
455
456 if (ops->nlmsg_payload)
457 payload += ops->nlmsg_payload(rule);
458
459 return payload;
460}
461
Thomas Graf14c0b972006-08-04 03:38:38 -0700462static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
463 u32 pid, u32 seq, int type, int flags,
464 struct fib_rules_ops *ops)
465{
466 struct nlmsghdr *nlh;
467 struct fib_rule_hdr *frh;
468
469 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
470 if (nlh == NULL)
Patrick McHardy26932562007-01-31 23:16:40 -0800471 return -EMSGSIZE;
Thomas Graf14c0b972006-08-04 03:38:38 -0700472
473 frh = nlmsg_data(nlh);
474 frh->table = rule->table;
Patrick McHardy9e762a42006-08-10 23:09:48 -0700475 NLA_PUT_U32(skb, FRA_TABLE, rule->table);
Thomas Graf14c0b972006-08-04 03:38:38 -0700476 frh->res1 = 0;
477 frh->res2 = 0;
478 frh->action = rule->action;
479 frh->flags = rule->flags;
480
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700481 if (rule->action == FR_ACT_GOTO && rule->ctarget == NULL)
482 frh->flags |= FIB_RULE_UNRESOLVED;
483
Thomas Graf2b443682007-03-26 17:37:59 -0700484 if (rule->ifname[0]) {
Thomas Graf14c0b972006-08-04 03:38:38 -0700485 NLA_PUT_STRING(skb, FRA_IFNAME, rule->ifname);
486
Thomas Graf2b443682007-03-26 17:37:59 -0700487 if (rule->ifindex == -1)
488 frh->flags |= FIB_RULE_DEV_DETACHED;
489 }
490
Thomas Graf14c0b972006-08-04 03:38:38 -0700491 if (rule->pref)
492 NLA_PUT_U32(skb, FRA_PRIORITY, rule->pref);
493
Thomas Grafb8964ed2006-11-09 15:22:18 -0800494 if (rule->mark)
495 NLA_PUT_U32(skb, FRA_FWMARK, rule->mark);
496
497 if (rule->mark_mask || rule->mark)
498 NLA_PUT_U32(skb, FRA_FWMASK, rule->mark_mask);
499
Thomas Graf0947c9fe2007-03-26 17:14:15 -0700500 if (rule->target)
501 NLA_PUT_U32(skb, FRA_GOTO, rule->target);
502
Thomas Graf14c0b972006-08-04 03:38:38 -0700503 if (ops->fill(rule, skb, nlh, frh) < 0)
504 goto nla_put_failure;
505
506 return nlmsg_end(skb, nlh);
507
508nla_put_failure:
Patrick McHardy26932562007-01-31 23:16:40 -0800509 nlmsg_cancel(skb, nlh);
510 return -EMSGSIZE;
Thomas Graf14c0b972006-08-04 03:38:38 -0700511}
512
Thomas Grafc4546732007-03-25 23:24:24 -0700513static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
514 struct fib_rules_ops *ops)
Thomas Graf14c0b972006-08-04 03:38:38 -0700515{
516 int idx = 0;
517 struct fib_rule *rule;
Thomas Graf14c0b972006-08-04 03:38:38 -0700518
Denis V. Lunev76c72d42007-09-16 15:44:27 -0700519 list_for_each_entry(rule, &ops->rules_list, list) {
Thomas Grafc4546732007-03-25 23:24:24 -0700520 if (idx < cb->args[1])
Thomas Graf14c0b972006-08-04 03:38:38 -0700521 goto skip;
522
523 if (fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).pid,
524 cb->nlh->nlmsg_seq, RTM_NEWRULE,
525 NLM_F_MULTI, ops) < 0)
526 break;
527skip:
528 idx++;
529 }
Thomas Grafc4546732007-03-25 23:24:24 -0700530 cb->args[1] = idx;
Thomas Graf14c0b972006-08-04 03:38:38 -0700531 rules_ops_put(ops);
532
533 return skb->len;
534}
535
Thomas Grafc4546732007-03-25 23:24:24 -0700536static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb)
537{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900538 struct net *net = sock_net(skb->sk);
Thomas Grafc4546732007-03-25 23:24:24 -0700539 struct fib_rules_ops *ops;
540 int idx = 0, family;
541
542 family = rtnl_msg_family(cb->nlh);
543 if (family != AF_UNSPEC) {
544 /* Protocol specific dump request */
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800545 ops = lookup_rules_ops(net, family);
Thomas Grafc4546732007-03-25 23:24:24 -0700546 if (ops == NULL)
547 return -EAFNOSUPPORT;
548
549 return dump_rules(skb, cb, ops);
550 }
551
552 rcu_read_lock();
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800553 list_for_each_entry_rcu(ops, &net->rules_ops, list) {
Thomas Grafc4546732007-03-25 23:24:24 -0700554 if (idx < cb->args[0] || !try_module_get(ops->owner))
555 goto skip;
556
557 if (dump_rules(skb, cb, ops) < 0)
558 break;
559
560 cb->args[1] = 0;
561 skip:
562 idx++;
563 }
564 rcu_read_unlock();
565 cb->args[0] = idx;
566
567 return skb->len;
568}
Thomas Graf14c0b972006-08-04 03:38:38 -0700569
Denis V. Lunev9e3a5482008-01-20 16:46:41 -0800570static void notify_rule_change(int event, struct fib_rule *rule,
Thomas Grafc17084d2006-08-15 00:32:48 -0700571 struct fib_rules_ops *ops, struct nlmsghdr *nlh,
572 u32 pid)
Thomas Graf14c0b972006-08-04 03:38:38 -0700573{
Denis V. Lunev9e3a5482008-01-20 16:46:41 -0800574 struct net *net;
Thomas Grafc17084d2006-08-15 00:32:48 -0700575 struct sk_buff *skb;
576 int err = -ENOBUFS;
Thomas Graf14c0b972006-08-04 03:38:38 -0700577
Denis V. Lunev9e3a5482008-01-20 16:46:41 -0800578 net = ops->fro_net;
Thomas Graf339bf982006-11-10 14:10:15 -0800579 skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
Thomas Graf14c0b972006-08-04 03:38:38 -0700580 if (skb == NULL)
Thomas Grafc17084d2006-08-15 00:32:48 -0700581 goto errout;
582
583 err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
Patrick McHardy26932562007-01-31 23:16:40 -0800584 if (err < 0) {
585 /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */
586 WARN_ON(err == -EMSGSIZE);
587 kfree_skb(skb);
588 goto errout;
589 }
Denis V. Lunev9e3a5482008-01-20 16:46:41 -0800590
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -0800591 rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
592 return;
Thomas Grafc17084d2006-08-15 00:32:48 -0700593errout:
594 if (err < 0)
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800595 rtnl_set_sk_err(net, ops->nlgroup, err);
Thomas Graf14c0b972006-08-04 03:38:38 -0700596}
597
598static void attach_rules(struct list_head *rules, struct net_device *dev)
599{
600 struct fib_rule *rule;
601
602 list_for_each_entry(rule, rules, list) {
603 if (rule->ifindex == -1 &&
604 strcmp(dev->name, rule->ifname) == 0)
605 rule->ifindex = dev->ifindex;
606 }
607}
608
609static void detach_rules(struct list_head *rules, struct net_device *dev)
610{
611 struct fib_rule *rule;
612
613 list_for_each_entry(rule, rules, list)
614 if (rule->ifindex == dev->ifindex)
615 rule->ifindex = -1;
616}
617
618
619static int fib_rules_event(struct notifier_block *this, unsigned long event,
620 void *ptr)
621{
622 struct net_device *dev = ptr;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900623 struct net *net = dev_net(dev);
Thomas Graf14c0b972006-08-04 03:38:38 -0700624 struct fib_rules_ops *ops;
625
626 ASSERT_RTNL();
627 rcu_read_lock();
628
629 switch (event) {
630 case NETDEV_REGISTER:
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800631 list_for_each_entry(ops, &net->rules_ops, list)
Denis V. Lunev76c72d42007-09-16 15:44:27 -0700632 attach_rules(&ops->rules_list, dev);
Thomas Graf14c0b972006-08-04 03:38:38 -0700633 break;
634
635 case NETDEV_UNREGISTER:
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800636 list_for_each_entry(ops, &net->rules_ops, list)
Denis V. Lunev76c72d42007-09-16 15:44:27 -0700637 detach_rules(&ops->rules_list, dev);
Thomas Graf14c0b972006-08-04 03:38:38 -0700638 break;
639 }
640
641 rcu_read_unlock();
642
643 return NOTIFY_DONE;
644}
645
646static struct notifier_block fib_rules_notifier = {
647 .notifier_call = fib_rules_event,
648};
649
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800650static int fib_rules_net_init(struct net *net)
651{
652 INIT_LIST_HEAD(&net->rules_ops);
653 spin_lock_init(&net->rules_mod_lock);
654 return 0;
655}
656
657static struct pernet_operations fib_rules_net_ops = {
658 .init = fib_rules_net_init,
659};
660
Thomas Graf14c0b972006-08-04 03:38:38 -0700661static int __init fib_rules_init(void)
662{
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800663 int err;
Thomas Graf9d9e6a52007-03-25 23:20:05 -0700664 rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL);
665 rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL);
Thomas Grafc4546732007-03-25 23:24:24 -0700666 rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule);
Thomas Graf9d9e6a52007-03-25 23:20:05 -0700667
Eric W. Biederman5d6d4802008-11-07 22:52:34 -0800668 err = register_pernet_subsys(&fib_rules_net_ops);
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800669 if (err < 0)
670 goto fail;
671
Eric W. Biederman5d6d4802008-11-07 22:52:34 -0800672 err = register_netdevice_notifier(&fib_rules_notifier);
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800673 if (err < 0)
674 goto fail_unregister;
Eric W. Biederman5d6d4802008-11-07 22:52:34 -0800675
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800676 return 0;
677
678fail_unregister:
Eric W. Biederman5d6d4802008-11-07 22:52:34 -0800679 unregister_pernet_subsys(&fib_rules_net_ops);
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -0800680fail:
681 rtnl_unregister(PF_UNSPEC, RTM_NEWRULE);
682 rtnl_unregister(PF_UNSPEC, RTM_DELRULE);
683 rtnl_unregister(PF_UNSPEC, RTM_GETRULE);
684 return err;
Thomas Graf14c0b972006-08-04 03:38:38 -0700685}
686
687subsys_initcall(fib_rules_init);