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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>
17
18#include <net/fib_rules.h>
19#include <net/ipv6.h>
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -070020#include <net/addrconf.h>
Thomas Graf101367c2006-08-04 03:39:02 -070021#include <net/ip6_route.h>
22#include <net/netlink.h>
23
24struct fib6_rule
25{
26 struct fib_rule common;
27 struct rt6key src;
28 struct rt6key dst;
29 u8 tclass;
30};
31
Daniel Lezcano58f09b72008-03-03 23:25:27 -080032struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi *fl,
33 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
Daniel Lezcanodcabb812008-03-03 23:33:08 -080040 fib_rules_lookup(net->ipv6.fib6_rules_ops, fl, flags, &arg);
Thomas Graf101367c2006-08-04 03:39:02 -070041
Ville Nuorvalab1429552006-08-08 16:44:17 -070042 if (arg.result)
YOSHIFUJI Hideaki40aa7b92006-10-19 13:50:09 +090043 return arg.result;
Ville Nuorvalab1429552006-08-08 16:44:17 -070044
Changli Gaod8d1f302010-06-10 23:31:35 -070045 dst_hold(&net->ipv6.ip6_null_entry->dst);
46 return &net->ipv6.ip6_null_entry->dst;
Thomas Graf101367c2006-08-04 03:39:02 -070047}
48
Adrian Bunk8ce11e62006-08-07 21:50:48 -070049static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
50 int flags, struct fib_lookup_arg *arg)
Thomas Graf101367c2006-08-04 03:39:02 -070051{
52 struct rt6_info *rt = NULL;
53 struct fib6_table *table;
Daniel Lezcano8ed67782008-03-04 13:48:30 -080054 struct net *net = rule->fr_net;
Thomas Graf101367c2006-08-04 03:39:02 -070055 pol_lookup_t lookup = arg->lookup_ptr;
56
57 switch (rule->action) {
58 case FR_ACT_TO_TBL:
59 break;
60 case FR_ACT_UNREACHABLE:
Daniel Lezcano8ed67782008-03-04 13:48:30 -080061 rt = net->ipv6.ip6_null_entry;
Thomas Graf101367c2006-08-04 03:39:02 -070062 goto discard_pkt;
63 default:
64 case FR_ACT_BLACKHOLE:
Daniel Lezcano8ed67782008-03-04 13:48:30 -080065 rt = net->ipv6.ip6_blk_hole_entry;
Thomas Graf101367c2006-08-04 03:39:02 -070066 goto discard_pkt;
67 case FR_ACT_PROHIBIT:
Daniel Lezcano8ed67782008-03-04 13:48:30 -080068 rt = net->ipv6.ip6_prohibit_entry;
Thomas Graf101367c2006-08-04 03:39:02 -070069 goto discard_pkt;
70 }
71
Daniel Lezcano8ed67782008-03-04 13:48:30 -080072 table = fib6_get_table(net, rule->table);
Thomas Graf101367c2006-08-04 03:39:02 -070073 if (table)
Daniel Lezcano8ed67782008-03-04 13:48:30 -080074 rt = lookup(net, table, flp, flags);
Thomas Graf101367c2006-08-04 03:39:02 -070075
Daniel Lezcano8ed67782008-03-04 13:48:30 -080076 if (rt != net->ipv6.ip6_null_entry) {
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -070077 struct fib6_rule *r = (struct fib6_rule *)rule;
78
79 /*
80 * If we need to find a source address for this traffic,
81 * we check the result if it meets requirement of the rule.
82 */
83 if ((rule->flags & FIB_RULE_FIND_SADDR) &&
84 r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) {
85 struct in6_addr saddr;
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +090086
Brian Haley191cd582008-08-14 15:33:21 -070087 if (ipv6_dev_get_saddr(net,
Changli Gaod8d1f302010-06-10 23:31:35 -070088 ip6_dst_idev(&rt->dst)->dev,
YOSHIFUJI Hideaki / 吉藤英明0c9a2ac2010-03-07 00:14:44 +000089 &flp->fl6_dst,
90 rt6_flags2srcprefs(flags),
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +090091 &saddr))
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -070092 goto again;
93 if (!ipv6_prefix_equal(&saddr, &r->src.addr,
94 r->src.plen))
95 goto again;
96 ipv6_addr_copy(&flp->fl6_src, &saddr);
97 }
Thomas Graf101367c2006-08-04 03:39:02 -070098 goto out;
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -070099 }
100again:
Changli Gaod8d1f302010-06-10 23:31:35 -0700101 dst_release(&rt->dst);
Patrick McHardy3226f6882006-08-06 22:24:08 -0700102 rt = NULL;
103 goto out;
104
Thomas Graf101367c2006-08-04 03:39:02 -0700105discard_pkt:
Changli Gaod8d1f302010-06-10 23:31:35 -0700106 dst_hold(&rt->dst);
Thomas Graf101367c2006-08-04 03:39:02 -0700107out:
108 arg->result = rt;
109 return rt == NULL ? -EAGAIN : 0;
110}
111
112
113static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
114{
115 struct fib6_rule *r = (struct fib6_rule *) rule;
116
Thomas Grafadaa70b2006-10-13 15:01:03 -0700117 if (r->dst.plen &&
118 !ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen))
Thomas Graf101367c2006-08-04 03:39:02 -0700119 return 0;
120
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -0700121 /*
122 * If FIB_RULE_FIND_SADDR is set and we do not have a
123 * source address for the traffic, we defer check for
124 * source address.
125 */
Thomas Grafadaa70b2006-10-13 15:01:03 -0700126 if (r->src.plen) {
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -0700127 if (flags & RT6_LOOKUP_F_HAS_SADDR) {
128 if (!ipv6_prefix_equal(&fl->fl6_src, &r->src.addr,
129 r->src.plen))
130 return 0;
131 } else if (!(r->common.flags & FIB_RULE_FIND_SADDR))
Thomas Grafadaa70b2006-10-13 15:01:03 -0700132 return 0;
133 }
Thomas Graf101367c2006-08-04 03:39:02 -0700134
YOSHIFUJI Hideaki2cc67cc2006-08-21 19:18:57 +0900135 if (r->tclass && r->tclass != ((ntohl(fl->fl6_flowlabel) >> 20) & 0xff))
136 return 0;
137
Thomas Graf101367c2006-08-04 03:39:02 -0700138 return 1;
139}
140
Patrick McHardyef7c79e2007-06-05 12:38:30 -0700141static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = {
Thomas Graf1f6c9552006-11-09 15:22:48 -0800142 FRA_GENERIC_POLICY,
Thomas Graf101367c2006-08-04 03:39:02 -0700143};
144
145static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
Rami Rosen8b3521e2009-05-11 05:52:49 +0000146 struct fib_rule_hdr *frh,
Thomas Graf101367c2006-08-04 03:39:02 -0700147 struct nlattr **tb)
148{
149 int err = -EINVAL;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900150 struct net *net = sock_net(skb->sk);
Thomas Graf101367c2006-08-04 03:39:02 -0700151 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
152
Thomas Graf101367c2006-08-04 03:39:02 -0700153 if (rule->action == FR_ACT_TO_TBL) {
154 if (rule->table == RT6_TABLE_UNSPEC)
155 goto errout;
156
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800157 if (fib6_new_table(net, rule->table) == NULL) {
Thomas Graf101367c2006-08-04 03:39:02 -0700158 err = -ENOBUFS;
159 goto errout;
160 }
161 }
162
Thomas Grafe1701c62007-03-24 12:46:02 -0700163 if (frh->src_len)
Thomas Graf101367c2006-08-04 03:39:02 -0700164 nla_memcpy(&rule6->src.addr, tb[FRA_SRC],
165 sizeof(struct in6_addr));
166
Thomas Grafe1701c62007-03-24 12:46:02 -0700167 if (frh->dst_len)
Thomas Graf101367c2006-08-04 03:39:02 -0700168 nla_memcpy(&rule6->dst.addr, tb[FRA_DST],
169 sizeof(struct in6_addr));
170
171 rule6->src.plen = frh->src_len;
172 rule6->dst.plen = frh->dst_len;
173 rule6->tclass = frh->tos;
174
175 err = 0;
176errout:
177 return err;
178}
179
180static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
181 struct nlattr **tb)
182{
183 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
184
185 if (frh->src_len && (rule6->src.plen != frh->src_len))
186 return 0;
187
188 if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
189 return 0;
190
191 if (frh->tos && (rule6->tclass != frh->tos))
192 return 0;
193
Thomas Grafe1701c62007-03-24 12:46:02 -0700194 if (frh->src_len &&
Thomas Graf101367c2006-08-04 03:39:02 -0700195 nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
196 return 0;
197
Thomas Grafe1701c62007-03-24 12:46:02 -0700198 if (frh->dst_len &&
Thomas Graf101367c2006-08-04 03:39:02 -0700199 nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
200 return 0;
201
202 return 1;
203}
204
205static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
Rami Rosen04af8cf2009-05-20 17:26:23 -0700206 struct fib_rule_hdr *frh)
Thomas Graf101367c2006-08-04 03:39:02 -0700207{
208 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
209
Thomas Graf101367c2006-08-04 03:39:02 -0700210 frh->dst_len = rule6->dst.plen;
211 frh->src_len = rule6->src.plen;
212 frh->tos = rule6->tclass;
213
214 if (rule6->dst.plen)
215 NLA_PUT(skb, FRA_DST, sizeof(struct in6_addr),
216 &rule6->dst.addr);
217
218 if (rule6->src.plen)
219 NLA_PUT(skb, FRA_SRC, sizeof(struct in6_addr),
220 &rule6->src.addr);
221
Thomas Graf101367c2006-08-04 03:39:02 -0700222 return 0;
223
224nla_put_failure:
225 return -ENOBUFS;
226}
227
Denis V. Lunev868d13a2008-01-10 03:18:25 -0800228static u32 fib6_rule_default_pref(struct fib_rules_ops *ops)
Thomas Graf101367c2006-08-04 03:39:02 -0700229{
230 return 0x3FFF;
231}
232
Thomas Graf339bf982006-11-10 14:10:15 -0800233static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
234{
235 return nla_total_size(16) /* dst */
236 + nla_total_size(16); /* src */
237}
238
Patrick McHardy3d0c9c42010-04-26 16:02:04 +0200239static const struct fib_rules_ops __net_initdata fib6_rules_ops_template = {
Patrick McHardy25239ce2010-04-26 16:02:05 +0200240 .family = AF_INET6,
Thomas Graf101367c2006-08-04 03:39:02 -0700241 .rule_size = sizeof(struct fib6_rule),
Thomas Grafe1701c62007-03-24 12:46:02 -0700242 .addr_size = sizeof(struct in6_addr),
Thomas Graf101367c2006-08-04 03:39:02 -0700243 .action = fib6_rule_action,
244 .match = fib6_rule_match,
245 .configure = fib6_rule_configure,
246 .compare = fib6_rule_compare,
247 .fill = fib6_rule_fill,
248 .default_pref = fib6_rule_default_pref,
Thomas Graf339bf982006-11-10 14:10:15 -0800249 .nlmsg_payload = fib6_rule_nlmsg_payload,
Thomas Graf101367c2006-08-04 03:39:02 -0700250 .nlgroup = RTNLGRP_IPV6_RULE,
251 .policy = fib6_rule_policy,
Thomas Graf101367c2006-08-04 03:39:02 -0700252 .owner = THIS_MODULE,
Denis V. Lunev03592382008-01-20 16:46:01 -0800253 .fro_net = &init_net,
Thomas Graf101367c2006-08-04 03:39:02 -0700254};
255
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000256static int __net_init fib6_rules_net_init(struct net *net)
Denis V. Lunev2994c632007-11-10 22:12:03 -0800257{
Eric W. Biedermane9c51582009-12-03 12:22:55 -0800258 struct fib_rules_ops *ops;
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800259 int err = -ENOMEM;
Denis V. Lunev2994c632007-11-10 22:12:03 -0800260
Eric W. Biedermane9c51582009-12-03 12:22:55 -0800261 ops = fib_rules_register(&fib6_rules_ops_template, net);
262 if (IS_ERR(ops))
263 return PTR_ERR(ops);
264 net->ipv6.fib6_rules_ops = ops;
Daniel Lezcano9eb87f32007-12-07 00:42:52 -0800265
Daniel Lezcano9eb87f32007-12-07 00:42:52 -0800266
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800267 err = fib_default_rule_add(net->ipv6.fib6_rules_ops, 0,
Patrick McHardy5adef182009-12-03 01:25:57 +0000268 RT6_TABLE_LOCAL, 0);
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800269 if (err)
270 goto out_fib6_rules_ops;
271
272 err = fib_default_rule_add(net->ipv6.fib6_rules_ops,
273 0x7FFE, RT6_TABLE_MAIN, 0);
274 if (err)
Eric W. Biedermane9c51582009-12-03 12:22:55 -0800275 goto out_fib6_rules_ops;
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800276
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800277out:
278 return err;
279
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800280out_fib6_rules_ops:
Eric W. Biedermane9c51582009-12-03 12:22:55 -0800281 fib_rules_unregister(ops);
Daniel Lezcano9eb87f32007-12-07 00:42:52 -0800282 goto out;
Thomas Graf101367c2006-08-04 03:39:02 -0700283}
284
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000285static void __net_exit fib6_rules_net_exit(struct net *net)
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800286{
287 fib_rules_unregister(net->ipv6.fib6_rules_ops);
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800288}
289
290static struct pernet_operations fib6_rules_net_ops = {
291 .init = fib6_rules_net_init,
292 .exit = fib6_rules_net_exit,
293};
294
295int __init fib6_rules_init(void)
296{
297 return register_pernet_subsys(&fib6_rules_net_ops);
298}
299
300
Thomas Graf101367c2006-08-04 03:39:02 -0700301void fib6_rules_cleanup(void)
302{
YOSHIFUJI Hideakiff4e1fb2008-04-10 15:41:28 +0900303 unregister_pernet_subsys(&fib6_rules_net_ops);
Thomas Graf101367c2006-08-04 03:39:02 -0700304}