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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
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;
58
59 switch (rule->action) {
60 case FR_ACT_TO_TBL:
61 break;
62 case FR_ACT_UNREACHABLE:
Daniel Lezcano8ed67782008-03-04 13:48:30 -080063 rt = net->ipv6.ip6_null_entry;
Thomas Graf101367c2006-08-04 03:39:02 -070064 goto discard_pkt;
65 default:
66 case FR_ACT_BLACKHOLE:
Daniel Lezcano8ed67782008-03-04 13:48:30 -080067 rt = net->ipv6.ip6_blk_hole_entry;
Thomas Graf101367c2006-08-04 03:39:02 -070068 goto discard_pkt;
69 case FR_ACT_PROHIBIT:
Daniel Lezcano8ed67782008-03-04 13:48:30 -080070 rt = net->ipv6.ip6_prohibit_entry;
Thomas Graf101367c2006-08-04 03:39:02 -070071 goto discard_pkt;
72 }
73
Daniel Lezcano8ed67782008-03-04 13:48:30 -080074 table = fib6_get_table(net, rule->table);
Thomas Graf101367c2006-08-04 03:39:02 -070075 if (table)
David S. Miller4c9483b2011-03-12 16:22:43 -050076 rt = lookup(net, table, flp6, flags);
Thomas Graf101367c2006-08-04 03:39:02 -070077
Daniel Lezcano8ed67782008-03-04 13:48:30 -080078 if (rt != net->ipv6.ip6_null_entry) {
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -070079 struct fib6_rule *r = (struct fib6_rule *)rule;
80
81 /*
82 * If we need to find a source address for this traffic,
83 * we check the result if it meets requirement of the rule.
84 */
85 if ((rule->flags & FIB_RULE_FIND_SADDR) &&
86 r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) {
87 struct in6_addr saddr;
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +090088
Brian Haley191cd582008-08-14 15:33:21 -070089 if (ipv6_dev_get_saddr(net,
Changli Gaod8d1f302010-06-10 23:31:35 -070090 ip6_dst_idev(&rt->dst)->dev,
David S. Miller4c9483b2011-03-12 16:22:43 -050091 &flp6->daddr,
YOSHIFUJI Hideaki / 吉藤英明0c9a2ac2010-03-07 00:14:44 +000092 rt6_flags2srcprefs(flags),
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +090093 &saddr))
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -070094 goto again;
95 if (!ipv6_prefix_equal(&saddr, &r->src.addr,
96 r->src.plen))
97 goto again;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +000098 flp6->saddr = saddr;
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -070099 }
Thomas Graf101367c2006-08-04 03:39:02 -0700100 goto out;
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -0700101 }
102again:
Changli Gaod8d1f302010-06-10 23:31:35 -0700103 dst_release(&rt->dst);
Patrick McHardy3226f6882006-08-06 22:24:08 -0700104 rt = NULL;
105 goto out;
106
Thomas Graf101367c2006-08-04 03:39:02 -0700107discard_pkt:
Changli Gaod8d1f302010-06-10 23:31:35 -0700108 dst_hold(&rt->dst);
Thomas Graf101367c2006-08-04 03:39:02 -0700109out:
110 arg->result = rt;
111 return rt == NULL ? -EAGAIN : 0;
112}
113
114
115static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
116{
117 struct fib6_rule *r = (struct fib6_rule *) rule;
David S. Miller4c9483b2011-03-12 16:22:43 -0500118 struct flowi6 *fl6 = &fl->u.ip6;
Thomas Graf101367c2006-08-04 03:39:02 -0700119
Thomas Grafadaa70b2006-10-13 15:01:03 -0700120 if (r->dst.plen &&
David S. Miller4c9483b2011-03-12 16:22:43 -0500121 !ipv6_prefix_equal(&fl6->daddr, &r->dst.addr, r->dst.plen))
Thomas Graf101367c2006-08-04 03:39:02 -0700122 return 0;
123
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -0700124 /*
125 * If FIB_RULE_FIND_SADDR is set and we do not have a
126 * source address for the traffic, we defer check for
127 * source address.
128 */
Thomas Grafadaa70b2006-10-13 15:01:03 -0700129 if (r->src.plen) {
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -0700130 if (flags & RT6_LOOKUP_F_HAS_SADDR) {
David S. Miller4c9483b2011-03-12 16:22:43 -0500131 if (!ipv6_prefix_equal(&fl6->saddr, &r->src.addr,
YOSHIFUJI Hideaki29f6af72007-04-06 11:45:39 -0700132 r->src.plen))
133 return 0;
134 } else if (!(r->common.flags & FIB_RULE_FIND_SADDR))
Thomas Grafadaa70b2006-10-13 15:01:03 -0700135 return 0;
136 }
Thomas Graf101367c2006-08-04 03:39:02 -0700137
David S. Miller4c9483b2011-03-12 16:22:43 -0500138 if (r->tclass && r->tclass != ((ntohl(fl6->flowlabel) >> 20) & 0xff))
YOSHIFUJI Hideaki2cc67cc2006-08-21 19:18:57 +0900139 return 0;
140
Thomas Graf101367c2006-08-04 03:39:02 -0700141 return 1;
142}
143
Patrick McHardyef7c79e2007-06-05 12:38:30 -0700144static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = {
Thomas Graf1f6c9552006-11-09 15:22:48 -0800145 FRA_GENERIC_POLICY,
Thomas Graf101367c2006-08-04 03:39:02 -0700146};
147
148static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
Rami Rosen8b3521e2009-05-11 05:52:49 +0000149 struct fib_rule_hdr *frh,
Thomas Graf101367c2006-08-04 03:39:02 -0700150 struct nlattr **tb)
151{
152 int err = -EINVAL;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900153 struct net *net = sock_net(skb->sk);
Thomas Graf101367c2006-08-04 03:39:02 -0700154 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
155
Thomas Graf101367c2006-08-04 03:39:02 -0700156 if (rule->action == FR_ACT_TO_TBL) {
157 if (rule->table == RT6_TABLE_UNSPEC)
158 goto errout;
159
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800160 if (fib6_new_table(net, rule->table) == NULL) {
Thomas Graf101367c2006-08-04 03:39:02 -0700161 err = -ENOBUFS;
162 goto errout;
163 }
164 }
165
Thomas Grafe1701c62007-03-24 12:46:02 -0700166 if (frh->src_len)
Thomas Graf101367c2006-08-04 03:39:02 -0700167 nla_memcpy(&rule6->src.addr, tb[FRA_SRC],
168 sizeof(struct in6_addr));
169
Thomas Grafe1701c62007-03-24 12:46:02 -0700170 if (frh->dst_len)
Thomas Graf101367c2006-08-04 03:39:02 -0700171 nla_memcpy(&rule6->dst.addr, tb[FRA_DST],
172 sizeof(struct in6_addr));
173
174 rule6->src.plen = frh->src_len;
175 rule6->dst.plen = frh->dst_len;
176 rule6->tclass = frh->tos;
177
178 err = 0;
179errout:
180 return err;
181}
182
183static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
184 struct nlattr **tb)
185{
186 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
187
188 if (frh->src_len && (rule6->src.plen != frh->src_len))
189 return 0;
190
191 if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
192 return 0;
193
194 if (frh->tos && (rule6->tclass != frh->tos))
195 return 0;
196
Thomas Grafe1701c62007-03-24 12:46:02 -0700197 if (frh->src_len &&
Thomas Graf101367c2006-08-04 03:39:02 -0700198 nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
199 return 0;
200
Thomas Grafe1701c62007-03-24 12:46:02 -0700201 if (frh->dst_len &&
Thomas Graf101367c2006-08-04 03:39:02 -0700202 nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
203 return 0;
204
205 return 1;
206}
207
208static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
Rami Rosen04af8cf2009-05-20 17:26:23 -0700209 struct fib_rule_hdr *frh)
Thomas Graf101367c2006-08-04 03:39:02 -0700210{
211 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
212
Thomas Graf101367c2006-08-04 03:39:02 -0700213 frh->dst_len = rule6->dst.plen;
214 frh->src_len = rule6->src.plen;
215 frh->tos = rule6->tclass;
216
David S. Millerc78679e2012-04-01 20:27:33 -0400217 if ((rule6->dst.plen &&
218 nla_put(skb, FRA_DST, sizeof(struct in6_addr),
219 &rule6->dst.addr)) ||
220 (rule6->src.plen &&
221 nla_put(skb, FRA_SRC, sizeof(struct in6_addr),
222 &rule6->src.addr)))
223 goto nla_put_failure;
Thomas Graf101367c2006-08-04 03:39:02 -0700224 return 0;
225
226nla_put_failure:
227 return -ENOBUFS;
228}
229
Denis V. Lunev868d13a2008-01-10 03:18:25 -0800230static u32 fib6_rule_default_pref(struct fib_rules_ops *ops)
Thomas Graf101367c2006-08-04 03:39:02 -0700231{
232 return 0x3FFF;
233}
234
Thomas Graf339bf982006-11-10 14:10:15 -0800235static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
236{
237 return nla_total_size(16) /* dst */
238 + nla_total_size(16); /* src */
239}
240
Andi Kleen04a6f822012-10-04 17:12:11 -0700241static const struct fib_rules_ops __net_initconst fib6_rules_ops_template = {
Patrick McHardy25239ce2010-04-26 16:02:05 +0200242 .family = AF_INET6,
Thomas Graf101367c2006-08-04 03:39:02 -0700243 .rule_size = sizeof(struct fib6_rule),
Thomas Grafe1701c62007-03-24 12:46:02 -0700244 .addr_size = sizeof(struct in6_addr),
Thomas Graf101367c2006-08-04 03:39:02 -0700245 .action = fib6_rule_action,
246 .match = fib6_rule_match,
247 .configure = fib6_rule_configure,
248 .compare = fib6_rule_compare,
249 .fill = fib6_rule_fill,
250 .default_pref = fib6_rule_default_pref,
Thomas Graf339bf982006-11-10 14:10:15 -0800251 .nlmsg_payload = fib6_rule_nlmsg_payload,
Thomas Graf101367c2006-08-04 03:39:02 -0700252 .nlgroup = RTNLGRP_IPV6_RULE,
253 .policy = fib6_rule_policy,
Thomas Graf101367c2006-08-04 03:39:02 -0700254 .owner = THIS_MODULE,
Denis V. Lunev03592382008-01-20 16:46:01 -0800255 .fro_net = &init_net,
Thomas Graf101367c2006-08-04 03:39:02 -0700256};
257
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000258static int __net_init fib6_rules_net_init(struct net *net)
Denis V. Lunev2994c632007-11-10 22:12:03 -0800259{
Eric W. Biedermane9c51582009-12-03 12:22:55 -0800260 struct fib_rules_ops *ops;
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800261 int err = -ENOMEM;
Denis V. Lunev2994c632007-11-10 22:12:03 -0800262
Eric W. Biedermane9c51582009-12-03 12:22:55 -0800263 ops = fib_rules_register(&fib6_rules_ops_template, net);
264 if (IS_ERR(ops))
265 return PTR_ERR(ops);
266 net->ipv6.fib6_rules_ops = ops;
Daniel Lezcano9eb87f32007-12-07 00:42:52 -0800267
Daniel Lezcano9eb87f32007-12-07 00:42:52 -0800268
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800269 err = fib_default_rule_add(net->ipv6.fib6_rules_ops, 0,
Patrick McHardy5adef182009-12-03 01:25:57 +0000270 RT6_TABLE_LOCAL, 0);
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800271 if (err)
272 goto out_fib6_rules_ops;
273
274 err = fib_default_rule_add(net->ipv6.fib6_rules_ops,
275 0x7FFE, RT6_TABLE_MAIN, 0);
276 if (err)
Eric W. Biedermane9c51582009-12-03 12:22:55 -0800277 goto out_fib6_rules_ops;
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800278
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800279out:
280 return err;
281
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800282out_fib6_rules_ops:
Eric W. Biedermane9c51582009-12-03 12:22:55 -0800283 fib_rules_unregister(ops);
Daniel Lezcano9eb87f32007-12-07 00:42:52 -0800284 goto out;
Thomas Graf101367c2006-08-04 03:39:02 -0700285}
286
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000287static void __net_exit fib6_rules_net_exit(struct net *net)
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800288{
289 fib_rules_unregister(net->ipv6.fib6_rules_ops);
Daniel Lezcanodcabb812008-03-03 23:33:08 -0800290}
291
292static struct pernet_operations fib6_rules_net_ops = {
293 .init = fib6_rules_net_init,
294 .exit = fib6_rules_net_exit,
295};
296
297int __init fib6_rules_init(void)
298{
299 return register_pernet_subsys(&fib6_rules_net_ops);
300}
301
302
Thomas Graf101367c2006-08-04 03:39:02 -0700303void fib6_rules_cleanup(void)
304{
YOSHIFUJI Hideakiff4e1fb2008-04-10 15:41:28 +0900305 unregister_pernet_subsys(&fib6_rules_net_ops);
Thomas Graf101367c2006-08-04 03:39:02 -0700306}