blob: 2367a16eae58a31e01aa0d1d676090b688102593 [file] [log] [blame]
Thomas Graf101367c2006-08-04 03:39:02 -07001/*
2 * net/ipv6/fib6_rules.c IPv6 Routing Policy Rules
3 *
4 * Copyright (C)2003-2006 Helsinki University of Technology
5 * Copyright (C)2003-2006 USAGI/WIDE Project
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation, version 2.
10 *
11 * Authors
12 * Thomas Graf <tgraf@suug.ch>
13 * Ville Nuorvala <vnuorval@tcs.hut.fi>
14 */
15
Thomas Graf101367c2006-08-04 03:39:02 -070016#include <linux/netdevice.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040017#include <linux/export.h>
Thomas Graf101367c2006-08-04 03:39:02 -070018
19#include <net/fib_rules.h>
20#include <net/ipv6.h>
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -070021#include <net/addrconf.h>
Thomas Graf101367c2006-08-04 03:39:02 -070022#include <net/ip6_route.h>
23#include <net/netlink.h>
24
Eldad Zack911c8542012-04-01 07:49:06 +000025struct fib6_rule {
Thomas Graf101367c2006-08-04 03:39:02 -070026 struct fib_rule common;
27 struct rt6key src;
28 struct rt6key dst;
29 u8 tclass;
30};
31
David S. Miller4c9483b2011-03-12 16:22:43 -050032struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
Daniel Lezcano58f09b72008-03-03 23:25:27 -080033 int flags, pol_lookup_t lookup)
Thomas Graf101367c2006-08-04 03:39:02 -070034{
35 struct fib_lookup_arg arg = {
36 .lookup_ptr = lookup,
Eric Dumazet2c1c0002010-10-13 02:45:40 +000037 .flags = FIB_LOOKUP_NOREF,
Thomas Graf101367c2006-08-04 03:39:02 -070038 };
39
David S. Miller4c9483b2011-03-12 16:22:43 -050040 fib_rules_lookup(net->ipv6.fib6_rules_ops,
41 flowi6_to_flowi(fl6), flags, &arg);
Thomas Graf101367c2006-08-04 03:39:02 -070042
Ville Nuorvalab1429552006-08-08 16:44:17 -070043 if (arg.result)
YOSHIFUJI Hideaki40aa7b92006-10-19 13:50:09 +090044 return arg.result;
Ville Nuorvalab1429552006-08-08 16:44:17 -070045
Changli Gaod8d1f302010-06-10 23:31:35 -070046 dst_hold(&net->ipv6.ip6_null_entry->dst);
47 return &net->ipv6.ip6_null_entry->dst;
Thomas Graf101367c2006-08-04 03:39:02 -070048}
49
Adrian Bunk8ce11e62006-08-07 21:50:48 -070050static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
51 int flags, struct fib_lookup_arg *arg)
Thomas Graf101367c2006-08-04 03:39:02 -070052{
David S. Miller4c9483b2011-03-12 16:22:43 -050053 struct flowi6 *flp6 = &flp->u.ip6;
Thomas Graf101367c2006-08-04 03:39:02 -070054 struct rt6_info *rt = NULL;
55 struct fib6_table *table;
Daniel Lezcano8ed67782008-03-04 13:48:30 -080056 struct net *net = rule->fr_net;
Thomas Graf101367c2006-08-04 03:39:02 -070057 pol_lookup_t lookup = arg->lookup_ptr;
Hannes Frederic Sowa46b3a422013-08-01 08:54:47 +020058 int err = 0;
Thomas Graf101367c2006-08-04 03:39:02 -070059
60 switch (rule->action) {
61 case FR_ACT_TO_TBL:
62 break;
63 case FR_ACT_UNREACHABLE:
Hannes Frederic Sowa46b3a422013-08-01 08:54:47 +020064 err = -ENETUNREACH;
Daniel Lezcano8ed67782008-03-04 13:48:30 -080065 rt = net->ipv6.ip6_null_entry;
Thomas Graf101367c2006-08-04 03:39:02 -070066 goto discard_pkt;
67 default:
68 case FR_ACT_BLACKHOLE:
Hannes Frederic Sowa46b3a422013-08-01 08:54:47 +020069 err = -EINVAL;
Daniel Lezcano8ed67782008-03-04 13:48:30 -080070 rt = net->ipv6.ip6_blk_hole_entry;
Thomas Graf101367c2006-08-04 03:39:02 -070071 goto discard_pkt;
72 case FR_ACT_PROHIBIT:
Hannes Frederic Sowa46b3a422013-08-01 08:54:47 +020073 err = -EACCES;
Daniel Lezcano8ed67782008-03-04 13:48:30 -080074 rt = net->ipv6.ip6_prohibit_entry;
Thomas Graf101367c2006-08-04 03:39:02 -070075 goto discard_pkt;
76 }
77
Daniel Lezcano8ed67782008-03-04 13:48:30 -080078 table = fib6_get_table(net, rule->table);
Hannes Frederic Sowa46b3a422013-08-01 08:54:47 +020079 if (!table) {
80 err = -EAGAIN;
81 goto out;
82 }
Thomas Graf101367c2006-08-04 03:39:02 -070083
Hannes Frederic Sowa46b3a422013-08-01 08:54:47 +020084 rt = lookup(net, table, flp6, flags);
Daniel Lezcano8ed67782008-03-04 13:48:30 -080085 if (rt != net->ipv6.ip6_null_entry) {
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -070086 struct fib6_rule *r = (struct fib6_rule *)rule;
87
88 /*
89 * If we need to find a source address for this traffic,
90 * we check the result if it meets requirement of the rule.
91 */
92 if ((rule->flags & FIB_RULE_FIND_SADDR) &&
93 r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) {
94 struct in6_addr saddr;
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +090095
Brian Haley191cd582008-08-14 15:33:21 -070096 if (ipv6_dev_get_saddr(net,
Changli Gaod8d1f302010-06-10 23:31:35 -070097 ip6_dst_idev(&rt->dst)->dev,
David S. Miller4c9483b2011-03-12 16:22:43 -050098 &flp6->daddr,
YOSHIFUJI Hideaki / 吉藤英明0c9a2ac2010-03-07 00:14:44 +000099 rt6_flags2srcprefs(flags),
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +0900100 &saddr))
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -0700101 goto again;
102 if (!ipv6_prefix_equal(&saddr, &r->src.addr,
103 r->src.plen))
104 goto again;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000105 flp6->saddr = saddr;
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -0700106 }
Steven Barth73ba57b2015-03-19 16:16:04 +0100107 err = rt->dst.error;
Thomas Graf101367c2006-08-04 03:39:02 -0700108 goto out;
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -0700109 }
110again:
Amerigo Wang94e187c2012-10-29 00:13:19 +0000111 ip6_rt_put(rt);
Hannes Frederic Sowa46b3a422013-08-01 08:54:47 +0200112 err = -EAGAIN;
Patrick McHardy3226f6882006-08-06 22:24:08 -0700113 rt = NULL;
114 goto out;
115
Thomas Graf101367c2006-08-04 03:39:02 -0700116discard_pkt:
Changli Gaod8d1f302010-06-10 23:31:35 -0700117 dst_hold(&rt->dst);
Thomas Graf101367c2006-08-04 03:39:02 -0700118out:
119 arg->result = rt;
Hannes Frederic Sowa46b3a422013-08-01 08:54:47 +0200120 return err;
Thomas Graf101367c2006-08-04 03:39:02 -0700121}
122
Stefan Tomanek7764a452013-08-01 02:17:15 +0200123static bool fib6_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg)
124{
125 struct rt6_info *rt = (struct rt6_info *) arg->result;
Stefan Tomanek673498b2013-12-10 23:21:25 +0100126 struct net_device *dev = NULL;
127
128 if (rt->rt6i_idev)
129 dev = rt->rt6i_idev->dev;
130
Stefan Tomanek7764a452013-08-01 02:17:15 +0200131 /* do not accept result if the route does
132 * not meet the required prefix length
133 */
Stefan Tomanek73f56982013-08-03 14:14:43 +0200134 if (rt->rt6i_dst.plen <= rule->suppress_prefixlen)
Stefan Tomanek6ef94cf2013-08-02 17:19:56 +0200135 goto suppress_route;
136
137 /* do not accept result if the route uses a device
138 * belonging to a forbidden interface group
139 */
140 if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup)
141 goto suppress_route;
142
143 return false;
144
145suppress_route:
Stefan Tomanek04f08882013-09-08 17:09:43 +0200146 ip6_rt_put(rt);
147 return true;
Stefan Tomanek7764a452013-08-01 02:17:15 +0200148}
Thomas Graf101367c2006-08-04 03:39:02 -0700149
150static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
151{
152 struct fib6_rule *r = (struct fib6_rule *) rule;
David S. Miller4c9483b2011-03-12 16:22:43 -0500153 struct flowi6 *fl6 = &fl->u.ip6;
Thomas Graf101367c2006-08-04 03:39:02 -0700154
Thomas Grafadaa70b2006-10-13 15:01:03 -0700155 if (r->dst.plen &&
David S. Miller4c9483b2011-03-12 16:22:43 -0500156 !ipv6_prefix_equal(&fl6->daddr, &r->dst.addr, r->dst.plen))
Thomas Graf101367c2006-08-04 03:39:02 -0700157 return 0;
158
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -0700159 /*
160 * If FIB_RULE_FIND_SADDR is set and we do not have a
161 * source address for the traffic, we defer check for
162 * source address.
163 */
Thomas Grafadaa70b2006-10-13 15:01:03 -0700164 if (r->src.plen) {
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -0700165 if (flags & RT6_LOOKUP_F_HAS_SADDR) {
David S. Miller4c9483b2011-03-12 16:22:43 -0500166 if (!ipv6_prefix_equal(&fl6->saddr, &r->src.addr,
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -0700167 r->src.plen))
168 return 0;
169 } else if (!(r->common.flags & FIB_RULE_FIND_SADDR))
Thomas Grafadaa70b2006-10-13 15:01:03 -0700170 return 0;
171 }
Thomas Graf101367c2006-08-04 03:39:02 -0700172
Li RongQingd76ed222014-01-15 17:03:30 +0800173 if (r->tclass && r->tclass != ip6_tclass(fl6->flowlabel))
YOSHIFUJI Hideaki2cc67cc2006-08-21 19:18:57 +0900174 return 0;
175
Thomas Graf101367c2006-08-04 03:39:02 -0700176 return 1;
177}
178
Patrick McHardyef7c79e2007-06-05 12:38:30 -0700179static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = {
Thomas Graf1f6c9552006-11-09 15:22:48 -0800180 FRA_GENERIC_POLICY,
Thomas Graf101367c2006-08-04 03:39:02 -0700181};
182
183static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
Rami Rosen8b3521e2009-05-11 05:52:49 +0000184 struct fib_rule_hdr *frh,
Thomas Graf101367c2006-08-04 03:39:02 -0700185 struct nlattr **tb)
186{
187 int err = -EINVAL;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900188 struct net *net = sock_net(skb->sk);
Thomas Graf101367c2006-08-04 03:39:02 -0700189 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
190
Thomas Graf101367c2006-08-04 03:39:02 -0700191 if (rule->action == FR_ACT_TO_TBL) {
192 if (rule->table == RT6_TABLE_UNSPEC)
193 goto errout;
194
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800195 if (fib6_new_table(net, rule->table) == NULL) {
Thomas Graf101367c2006-08-04 03:39:02 -0700196 err = -ENOBUFS;
197 goto errout;
198 }
199 }
200
Thomas Grafe1701c62007-03-24 12:46:02 -0700201 if (frh->src_len)
Jiri Benc67b61f62015-03-29 16:59:26 +0200202 rule6->src.addr = nla_get_in6_addr(tb[FRA_SRC]);
Thomas Graf101367c2006-08-04 03:39:02 -0700203
Thomas Grafe1701c62007-03-24 12:46:02 -0700204 if (frh->dst_len)
Jiri Benc67b61f62015-03-29 16:59:26 +0200205 rule6->dst.addr = nla_get_in6_addr(tb[FRA_DST]);
Thomas Graf101367c2006-08-04 03:39:02 -0700206
207 rule6->src.plen = frh->src_len;
208 rule6->dst.plen = frh->dst_len;
209 rule6->tclass = frh->tos;
210
211 err = 0;
212errout:
213 return err;
214}
215
216static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
217 struct nlattr **tb)
218{
219 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
220
221 if (frh->src_len && (rule6->src.plen != frh->src_len))
222 return 0;
223
224 if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
225 return 0;
226
227 if (frh->tos && (rule6->tclass != frh->tos))
228 return 0;
229
Thomas Grafe1701c62007-03-24 12:46:02 -0700230 if (frh->src_len &&
Thomas Graf101367c2006-08-04 03:39:02 -0700231 nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
232 return 0;
233
Thomas Grafe1701c62007-03-24 12:46:02 -0700234 if (frh->dst_len &&
Thomas Graf101367c2006-08-04 03:39:02 -0700235 nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
236 return 0;
237
238 return 1;
239}
240
241static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
Rami Rosen04af8cf2009-05-20 17:26:23 -0700242 struct fib_rule_hdr *frh)
Thomas Graf101367c2006-08-04 03:39:02 -0700243{
244 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
245
Thomas Graf101367c2006-08-04 03:39:02 -0700246 frh->dst_len = rule6->dst.plen;
247 frh->src_len = rule6->src.plen;
248 frh->tos = rule6->tclass;
249
David S. Millerc78679e2012-04-01 20:27:33 -0400250 if ((rule6->dst.plen &&
Jiri Benc930345e2015-03-29 16:59:25 +0200251 nla_put_in6_addr(skb, FRA_DST, &rule6->dst.addr)) ||
David S. Millerc78679e2012-04-01 20:27:33 -0400252 (rule6->src.plen &&
Jiri Benc930345e2015-03-29 16:59:25 +0200253 nla_put_in6_addr(skb, FRA_SRC, &rule6->src.addr)))
David S. Millerc78679e2012-04-01 20:27:33 -0400254 goto nla_put_failure;
Thomas Graf101367c2006-08-04 03:39:02 -0700255 return 0;
256
257nla_put_failure:
258 return -ENOBUFS;
259}
260
Denis V. Lunev868d13a2008-01-10 03:18:25 -0800261static u32 fib6_rule_default_pref(struct fib_rules_ops *ops)
Thomas Graf101367c2006-08-04 03:39:02 -0700262{
263 return 0x3FFF;
264}
265
Thomas Graf339bf982006-11-10 14:10:15 -0800266static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
267{
268 return nla_total_size(16) /* dst */
269 + nla_total_size(16); /* src */
270}
271
Andi Kleen04a6f822012-10-04 17:12:11 -0700272static const struct fib_rules_ops __net_initconst fib6_rules_ops_template = {
Patrick McHardy25239ce2010-04-26 16:02:05 +0200273 .family = AF_INET6,
Thomas Graf101367c2006-08-04 03:39:02 -0700274 .rule_size = sizeof(struct fib6_rule),
Thomas Grafe1701c62007-03-24 12:46:02 -0700275 .addr_size = sizeof(struct in6_addr),
Thomas Graf101367c2006-08-04 03:39:02 -0700276 .action = fib6_rule_action,
277 .match = fib6_rule_match,
Stefan Tomanek7764a452013-08-01 02:17:15 +0200278 .suppress = fib6_rule_suppress,
Thomas Graf101367c2006-08-04 03:39:02 -0700279 .configure = fib6_rule_configure,
280 .compare = fib6_rule_compare,
281 .fill = fib6_rule_fill,
282 .default_pref = fib6_rule_default_pref,
Thomas Graf339bf982006-11-10 14:10:15 -0800283 .nlmsg_payload = fib6_rule_nlmsg_payload,
Thomas Graf101367c2006-08-04 03:39:02 -0700284 .nlgroup = RTNLGRP_IPV6_RULE,
285 .policy = fib6_rule_policy,
Thomas Graf101367c2006-08-04 03:39:02 -0700286 .owner = THIS_MODULE,
Denis V. Lunev035923832008-01-20 16:46:01 -0800287 .fro_net = &init_net,
Thomas Graf101367c2006-08-04 03:39:02 -0700288};
289
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000290static int __net_init fib6_rules_net_init(struct net *net)
Denis V. Lunev2994c632007-11-10 22:12:03 -0800291{
Eric W. Biedermane9c51582009-12-03 12:22:55 -0800292 struct fib_rules_ops *ops;
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800293 int err = -ENOMEM;
Denis V. Lunev2994c632007-11-10 22:12:03 -0800294
Eric W. Biedermane9c51582009-12-03 12:22:55 -0800295 ops = fib_rules_register(&fib6_rules_ops_template, net);
296 if (IS_ERR(ops))
297 return PTR_ERR(ops);
WANG Cong85b99092015-03-25 14:45:02 -0700298
299 err = fib_default_rule_add(ops, 0, RT6_TABLE_LOCAL, 0);
300 if (err)
301 goto out_fib6_rules_ops;
302
303 err = fib_default_rule_add(ops, 0x7FFE, RT6_TABLE_MAIN, 0);
304 if (err)
305 goto out_fib6_rules_ops;
306
Eric W. Biedermane9c51582009-12-03 12:22:55 -0800307 net->ipv6.fib6_rules_ops = ops;
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800308out:
309 return err;
310
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800311out_fib6_rules_ops:
Eric W. Biedermane9c51582009-12-03 12:22:55 -0800312 fib_rules_unregister(ops);
Daniel Lezcano9eb87f32007-12-07 00:42:52 -0800313 goto out;
Thomas Graf101367c2006-08-04 03:39:02 -0700314}
315
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000316static void __net_exit fib6_rules_net_exit(struct net *net)
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800317{
WANG Cong419df122015-03-31 11:01:46 -0700318 rtnl_lock();
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800319 fib_rules_unregister(net->ipv6.fib6_rules_ops);
WANG Cong419df122015-03-31 11:01:46 -0700320 rtnl_unlock();
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800321}
322
323static struct pernet_operations fib6_rules_net_ops = {
324 .init = fib6_rules_net_init,
325 .exit = fib6_rules_net_exit,
326};
327
328int __init fib6_rules_init(void)
329{
330 return register_pernet_subsys(&fib6_rules_net_ops);
331}
332
333
Thomas Graf101367c2006-08-04 03:39:02 -0700334void fib6_rules_cleanup(void)
335{
YOSHIFUJI Hideakiff4e1fb2008-04-10 15:41:28 +0900336 unregister_pernet_subsys(&fib6_rules_net_ops);
Thomas Graf101367c2006-08-04 03:39:02 -0700337}