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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>
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
25struct fib6_rule
26{
27 struct fib_rule common;
28 struct rt6key src;
29 struct rt6key dst;
30 u8 tclass;
31};
32
David S. Miller4c9483b2011-03-12 16:22:43 -050033struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
Daniel Lezcano58f09b72008-03-03 23:25:27 -080034 int flags, pol_lookup_t lookup)
Thomas Graf101367c2006-08-04 03:39:02 -070035{
36 struct fib_lookup_arg arg = {
37 .lookup_ptr = lookup,
Eric Dumazet2c1c0002010-10-13 02:45:40 +000038 .flags = FIB_LOOKUP_NOREF,
Thomas Graf101367c2006-08-04 03:39:02 -070039 };
40
David S. Miller4c9483b2011-03-12 16:22:43 -050041 fib_rules_lookup(net->ipv6.fib6_rules_ops,
42 flowi6_to_flowi(fl6), flags, &arg);
Thomas Graf101367c2006-08-04 03:39:02 -070043
Ville Nuorvalab1429552006-08-08 16:44:17 -070044 if (arg.result)
YOSHIFUJI Hideaki40aa7b92006-10-19 13:50:09 +090045 return arg.result;
Ville Nuorvalab1429552006-08-08 16:44:17 -070046
Changli Gaod8d1f302010-06-10 23:31:35 -070047 dst_hold(&net->ipv6.ip6_null_entry->dst);
48 return &net->ipv6.ip6_null_entry->dst;
Thomas Graf101367c2006-08-04 03:39:02 -070049}
50
Adrian Bunk8ce11e62006-08-07 21:50:48 -070051static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
52 int flags, struct fib_lookup_arg *arg)
Thomas Graf101367c2006-08-04 03:39:02 -070053{
David S. Miller4c9483b2011-03-12 16:22:43 -050054 struct flowi6 *flp6 = &flp->u.ip6;
Thomas Graf101367c2006-08-04 03:39:02 -070055 struct rt6_info *rt = NULL;
56 struct fib6_table *table;
Daniel Lezcano8ed67782008-03-04 13:48:30 -080057 struct net *net = rule->fr_net;
Thomas Graf101367c2006-08-04 03:39:02 -070058 pol_lookup_t lookup = arg->lookup_ptr;
59
60 switch (rule->action) {
61 case FR_ACT_TO_TBL:
62 break;
63 case FR_ACT_UNREACHABLE:
Daniel Lezcano8ed67782008-03-04 13:48:30 -080064 rt = net->ipv6.ip6_null_entry;
Thomas Graf101367c2006-08-04 03:39:02 -070065 goto discard_pkt;
66 default:
67 case FR_ACT_BLACKHOLE:
Daniel Lezcano8ed67782008-03-04 13:48:30 -080068 rt = net->ipv6.ip6_blk_hole_entry;
Thomas Graf101367c2006-08-04 03:39:02 -070069 goto discard_pkt;
70 case FR_ACT_PROHIBIT:
Daniel Lezcano8ed67782008-03-04 13:48:30 -080071 rt = net->ipv6.ip6_prohibit_entry;
Thomas Graf101367c2006-08-04 03:39:02 -070072 goto discard_pkt;
73 }
74
Daniel Lezcano8ed67782008-03-04 13:48:30 -080075 table = fib6_get_table(net, rule->table);
Thomas Graf101367c2006-08-04 03:39:02 -070076 if (table)
David S. Miller4c9483b2011-03-12 16:22:43 -050077 rt = lookup(net, table, flp6, flags);
Thomas Graf101367c2006-08-04 03:39:02 -070078
Daniel Lezcano8ed67782008-03-04 13:48:30 -080079 if (rt != net->ipv6.ip6_null_entry) {
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -070080 struct fib6_rule *r = (struct fib6_rule *)rule;
81
82 /*
83 * If we need to find a source address for this traffic,
84 * we check the result if it meets requirement of the rule.
85 */
86 if ((rule->flags & FIB_RULE_FIND_SADDR) &&
87 r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) {
88 struct in6_addr saddr;
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +090089
Brian Haley191cd582008-08-14 15:33:21 -070090 if (ipv6_dev_get_saddr(net,
Changli Gaod8d1f302010-06-10 23:31:35 -070091 ip6_dst_idev(&rt->dst)->dev,
David S. Miller4c9483b2011-03-12 16:22:43 -050092 &flp6->daddr,
YOSHIFUJI Hideaki / 吉藤英明0c9a2ac2010-03-07 00:14:44 +000093 rt6_flags2srcprefs(flags),
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +090094 &saddr))
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -070095 goto again;
96 if (!ipv6_prefix_equal(&saddr, &r->src.addr,
97 r->src.plen))
98 goto again;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +000099 flp6->saddr = saddr;
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -0700100 }
Thomas Graf101367c2006-08-04 03:39:02 -0700101 goto out;
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -0700102 }
103again:
Changli Gaod8d1f302010-06-10 23:31:35 -0700104 dst_release(&rt->dst);
Patrick McHardy3226f6882006-08-06 22:24:08 -0700105 rt = NULL;
106 goto out;
107
Thomas Graf101367c2006-08-04 03:39:02 -0700108discard_pkt:
Changli Gaod8d1f302010-06-10 23:31:35 -0700109 dst_hold(&rt->dst);
Thomas Graf101367c2006-08-04 03:39:02 -0700110out:
111 arg->result = rt;
112 return rt == NULL ? -EAGAIN : 0;
113}
114
115
116static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
117{
118 struct fib6_rule *r = (struct fib6_rule *) rule;
David S. Miller4c9483b2011-03-12 16:22:43 -0500119 struct flowi6 *fl6 = &fl->u.ip6;
Thomas Graf101367c2006-08-04 03:39:02 -0700120
Thomas Grafadaa70b2006-10-13 15:01:03 -0700121 if (r->dst.plen &&
David S. Miller4c9483b2011-03-12 16:22:43 -0500122 !ipv6_prefix_equal(&fl6->daddr, &r->dst.addr, r->dst.plen))
Thomas Graf101367c2006-08-04 03:39:02 -0700123 return 0;
124
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -0700125 /*
126 * If FIB_RULE_FIND_SADDR is set and we do not have a
127 * source address for the traffic, we defer check for
128 * source address.
129 */
Thomas Grafadaa70b2006-10-13 15:01:03 -0700130 if (r->src.plen) {
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -0700131 if (flags & RT6_LOOKUP_F_HAS_SADDR) {
David S. Miller4c9483b2011-03-12 16:22:43 -0500132 if (!ipv6_prefix_equal(&fl6->saddr, &r->src.addr,
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -0700133 r->src.plen))
134 return 0;
135 } else if (!(r->common.flags & FIB_RULE_FIND_SADDR))
Thomas Grafadaa70b2006-10-13 15:01:03 -0700136 return 0;
137 }
Thomas Graf101367c2006-08-04 03:39:02 -0700138
David S. Miller4c9483b2011-03-12 16:22:43 -0500139 if (r->tclass && r->tclass != ((ntohl(fl6->flowlabel) >> 20) & 0xff))
YOSHIFUJI Hideaki2cc67cc2006-08-21 19:18:57 +0900140 return 0;
141
Thomas Graf101367c2006-08-04 03:39:02 -0700142 return 1;
143}
144
Patrick McHardyef7c79e2007-06-05 12:38:30 -0700145static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = {
Thomas Graf1f6c9552006-11-09 15:22:48 -0800146 FRA_GENERIC_POLICY,
Thomas Graf101367c2006-08-04 03:39:02 -0700147};
148
149static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
Rami Rosen8b3521e2009-05-11 05:52:49 +0000150 struct fib_rule_hdr *frh,
Thomas Graf101367c2006-08-04 03:39:02 -0700151 struct nlattr **tb)
152{
153 int err = -EINVAL;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900154 struct net *net = sock_net(skb->sk);
Thomas Graf101367c2006-08-04 03:39:02 -0700155 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
156
Thomas Graf101367c2006-08-04 03:39:02 -0700157 if (rule->action == FR_ACT_TO_TBL) {
158 if (rule->table == RT6_TABLE_UNSPEC)
159 goto errout;
160
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800161 if (fib6_new_table(net, rule->table) == NULL) {
Thomas Graf101367c2006-08-04 03:39:02 -0700162 err = -ENOBUFS;
163 goto errout;
164 }
165 }
166
Thomas Grafe1701c62007-03-24 12:46:02 -0700167 if (frh->src_len)
Thomas Graf101367c2006-08-04 03:39:02 -0700168 nla_memcpy(&rule6->src.addr, tb[FRA_SRC],
169 sizeof(struct in6_addr));
170
Thomas Grafe1701c62007-03-24 12:46:02 -0700171 if (frh->dst_len)
Thomas Graf101367c2006-08-04 03:39:02 -0700172 nla_memcpy(&rule6->dst.addr, tb[FRA_DST],
173 sizeof(struct in6_addr));
174
175 rule6->src.plen = frh->src_len;
176 rule6->dst.plen = frh->dst_len;
177 rule6->tclass = frh->tos;
178
179 err = 0;
180errout:
181 return err;
182}
183
184static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
185 struct nlattr **tb)
186{
187 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
188
189 if (frh->src_len && (rule6->src.plen != frh->src_len))
190 return 0;
191
192 if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
193 return 0;
194
195 if (frh->tos && (rule6->tclass != frh->tos))
196 return 0;
197
Thomas Grafe1701c62007-03-24 12:46:02 -0700198 if (frh->src_len &&
Thomas Graf101367c2006-08-04 03:39:02 -0700199 nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
200 return 0;
201
Thomas Grafe1701c62007-03-24 12:46:02 -0700202 if (frh->dst_len &&
Thomas Graf101367c2006-08-04 03:39:02 -0700203 nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
204 return 0;
205
206 return 1;
207}
208
209static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
Rami Rosen04af8cf2009-05-20 17:26:23 -0700210 struct fib_rule_hdr *frh)
Thomas Graf101367c2006-08-04 03:39:02 -0700211{
212 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
213
Thomas Graf101367c2006-08-04 03:39:02 -0700214 frh->dst_len = rule6->dst.plen;
215 frh->src_len = rule6->src.plen;
216 frh->tos = rule6->tclass;
217
218 if (rule6->dst.plen)
219 NLA_PUT(skb, FRA_DST, sizeof(struct in6_addr),
220 &rule6->dst.addr);
221
222 if (rule6->src.plen)
223 NLA_PUT(skb, FRA_SRC, sizeof(struct in6_addr),
224 &rule6->src.addr);
225
Thomas Graf101367c2006-08-04 03:39:02 -0700226 return 0;
227
228nla_put_failure:
229 return -ENOBUFS;
230}
231
Denis V. Lunev868d13a2008-01-10 03:18:25 -0800232static u32 fib6_rule_default_pref(struct fib_rules_ops *ops)
Thomas Graf101367c2006-08-04 03:39:02 -0700233{
234 return 0x3FFF;
235}
236
Thomas Graf339bf982006-11-10 14:10:15 -0800237static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
238{
239 return nla_total_size(16) /* dst */
240 + nla_total_size(16); /* src */
241}
242
Patrick McHardy3d0c9c42010-04-26 16:02:04 +0200243static const struct fib_rules_ops __net_initdata fib6_rules_ops_template = {
Patrick McHardy25239ce2010-04-26 16:02:05 +0200244 .family = AF_INET6,
Thomas Graf101367c2006-08-04 03:39:02 -0700245 .rule_size = sizeof(struct fib6_rule),
Thomas Grafe1701c62007-03-24 12:46:02 -0700246 .addr_size = sizeof(struct in6_addr),
Thomas Graf101367c2006-08-04 03:39:02 -0700247 .action = fib6_rule_action,
248 .match = fib6_rule_match,
249 .configure = fib6_rule_configure,
250 .compare = fib6_rule_compare,
251 .fill = fib6_rule_fill,
252 .default_pref = fib6_rule_default_pref,
Thomas Graf339bf982006-11-10 14:10:15 -0800253 .nlmsg_payload = fib6_rule_nlmsg_payload,
Thomas Graf101367c2006-08-04 03:39:02 -0700254 .nlgroup = RTNLGRP_IPV6_RULE,
255 .policy = fib6_rule_policy,
Thomas Graf101367c2006-08-04 03:39:02 -0700256 .owner = THIS_MODULE,
Denis V. Lunev03592382008-01-20 16:46:01 -0800257 .fro_net = &init_net,
Thomas Graf101367c2006-08-04 03:39:02 -0700258};
259
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000260static int __net_init fib6_rules_net_init(struct net *net)
Denis V. Lunev2994c632007-11-10 22:12:03 -0800261{
Eric W. Biedermane9c51582009-12-03 12:22:55 -0800262 struct fib_rules_ops *ops;
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800263 int err = -ENOMEM;
Denis V. Lunev2994c632007-11-10 22:12:03 -0800264
Eric W. Biedermane9c51582009-12-03 12:22:55 -0800265 ops = fib_rules_register(&fib6_rules_ops_template, net);
266 if (IS_ERR(ops))
267 return PTR_ERR(ops);
268 net->ipv6.fib6_rules_ops = ops;
Daniel Lezcano9eb87f32007-12-07 00:42:52 -0800269
Daniel Lezcano9eb87f32007-12-07 00:42:52 -0800270
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800271 err = fib_default_rule_add(net->ipv6.fib6_rules_ops, 0,
Patrick McHardy5adef182009-12-03 01:25:57 +0000272 RT6_TABLE_LOCAL, 0);
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800273 if (err)
274 goto out_fib6_rules_ops;
275
276 err = fib_default_rule_add(net->ipv6.fib6_rules_ops,
277 0x7FFE, RT6_TABLE_MAIN, 0);
278 if (err)
Eric W. Biedermane9c51582009-12-03 12:22:55 -0800279 goto out_fib6_rules_ops;
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800280
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800281out:
282 return err;
283
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800284out_fib6_rules_ops:
Eric W. Biedermane9c51582009-12-03 12:22:55 -0800285 fib_rules_unregister(ops);
Daniel Lezcano9eb87f32007-12-07 00:42:52 -0800286 goto out;
Thomas Graf101367c2006-08-04 03:39:02 -0700287}
288
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000289static void __net_exit fib6_rules_net_exit(struct net *net)
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800290{
291 fib_rules_unregister(net->ipv6.fib6_rules_ops);
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800292}
293
294static struct pernet_operations fib6_rules_net_ops = {
295 .init = fib6_rules_net_init,
296 .exit = fib6_rules_net_exit,
297};
298
299int __init fib6_rules_init(void)
300{
301 return register_pernet_subsys(&fib6_rules_net_ops);
302}
303
304
Thomas Graf101367c2006-08-04 03:39:02 -0700305void fib6_rules_cleanup(void)
306{
YOSHIFUJI Hideakiff4e1fb2008-04-10 15:41:28 +0900307 unregister_pernet_subsys(&fib6_rules_net_ops);
Thomas Graf101367c2006-08-04 03:39:02 -0700308}