2 * net/ipv6/fib6_rules.c IPv6 Routing Policy Rules
4 * Copyright (C)2003-2006 Helsinki University of Technology
5 * Copyright (C)2003-2006 USAGI/WIDE Project
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.
12 * Thomas Graf <tgraf@suug.ch>
13 * Ville Nuorvala <vnuorval@tcs.hut.fi>
16 #include <linux/netdevice.h>
17 #include <linux/notifier.h>
18 #include <linux/export.h>
20 #include <net/fib_rules.h>
22 #include <net/addrconf.h>
23 #include <net/ip6_route.h>
24 #include <net/netlink.h>
27 struct fib_rule common;
33 static bool fib6_rule_matchall(const struct fib_rule *rule)
35 struct fib6_rule *r = container_of(rule, struct fib6_rule, common);
37 if (r->dst.plen || r->src.plen || r->tclass)
39 return fib_rule_matchall(rule);
42 bool fib6_rule_default(const struct fib_rule *rule)
44 if (!fib6_rule_matchall(rule) || rule->action != FR_ACT_TO_TBL ||
47 if (rule->table != RT6_TABLE_LOCAL && rule->table != RT6_TABLE_MAIN)
51 EXPORT_SYMBOL_GPL(fib6_rule_default);
53 int fib6_rules_dump(struct net *net, struct notifier_block *nb)
55 return fib_rules_dump(net, nb, AF_INET6);
58 unsigned int fib6_rules_seq_read(struct net *net)
60 return fib_rules_seq_read(net, AF_INET6);
63 struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
64 const struct sk_buff *skb,
65 int flags, pol_lookup_t lookup)
67 if (net->ipv6.fib6_has_custom_rules) {
68 struct fib_lookup_arg arg = {
71 .flags = FIB_LOOKUP_NOREF,
74 /* update flow if oif or iif point to device enslaved to l3mdev */
75 l3mdev_update_flow(net, flowi6_to_flowi(fl6));
77 fib_rules_lookup(net->ipv6.fib6_rules_ops,
78 flowi6_to_flowi(fl6), flags, &arg);
85 rt = lookup(net, net->ipv6.fib6_local_tbl, fl6, skb, flags);
86 if (rt != net->ipv6.ip6_null_entry && rt->dst.error != -EAGAIN)
89 rt = lookup(net, net->ipv6.fib6_main_tbl, fl6, skb, flags);
90 if (rt->dst.error != -EAGAIN)
95 dst_hold(&net->ipv6.ip6_null_entry->dst);
96 return &net->ipv6.ip6_null_entry->dst;
99 static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
100 int flags, struct fib_lookup_arg *arg)
102 struct flowi6 *flp6 = &flp->u.ip6;
103 struct rt6_info *rt = NULL;
104 struct fib6_table *table;
105 struct net *net = rule->fr_net;
106 pol_lookup_t lookup = arg->lookup_ptr;
110 switch (rule->action) {
113 case FR_ACT_UNREACHABLE:
115 rt = net->ipv6.ip6_null_entry;
118 case FR_ACT_BLACKHOLE:
120 rt = net->ipv6.ip6_blk_hole_entry;
122 case FR_ACT_PROHIBIT:
124 rt = net->ipv6.ip6_prohibit_entry;
128 tb_id = fib_rule_get_table(rule, arg);
129 table = fib6_get_table(net, tb_id);
135 rt = lookup(net, table, flp6, arg->lookup_data, flags);
136 if (rt != net->ipv6.ip6_null_entry) {
137 struct fib6_rule *r = (struct fib6_rule *)rule;
140 * If we need to find a source address for this traffic,
141 * we check the result if it meets requirement of the rule.
143 if ((rule->flags & FIB_RULE_FIND_SADDR) &&
144 r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) {
145 struct in6_addr saddr;
147 if (ipv6_dev_get_saddr(net,
148 ip6_dst_idev(&rt->dst)->dev,
150 rt6_flags2srcprefs(flags),
153 if (!ipv6_prefix_equal(&saddr, &r->src.addr,
175 static bool fib6_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg)
177 struct rt6_info *rt = (struct rt6_info *) arg->result;
178 struct net_device *dev = NULL;
181 dev = rt->rt6i_idev->dev;
183 /* do not accept result if the route does
184 * not meet the required prefix length
186 if (rt->rt6i_dst.plen <= rule->suppress_prefixlen)
189 /* do not accept result if the route uses a device
190 * belonging to a forbidden interface group
192 if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup)
202 static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
204 struct fib6_rule *r = (struct fib6_rule *) rule;
205 struct flowi6 *fl6 = &fl->u.ip6;
208 !ipv6_prefix_equal(&fl6->daddr, &r->dst.addr, r->dst.plen))
212 * If FIB_RULE_FIND_SADDR is set and we do not have a
213 * source address for the traffic, we defer check for
217 if (flags & RT6_LOOKUP_F_HAS_SADDR) {
218 if (!ipv6_prefix_equal(&fl6->saddr, &r->src.addr,
221 } else if (!(r->common.flags & FIB_RULE_FIND_SADDR))
225 if (r->tclass && r->tclass != ip6_tclass(fl6->flowlabel))
228 if (rule->ip_proto && (rule->ip_proto != fl6->flowi6_proto))
231 if (fib_rule_port_range_set(&rule->sport_range) &&
232 !fib_rule_port_inrange(&rule->sport_range, fl6->fl6_sport))
235 if (fib_rule_port_range_set(&rule->dport_range) &&
236 !fib_rule_port_inrange(&rule->dport_range, fl6->fl6_dport))
242 static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = {
246 static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
247 struct fib_rule_hdr *frh,
251 struct net *net = sock_net(skb->sk);
252 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
254 if (rule->action == FR_ACT_TO_TBL && !rule->l3mdev) {
255 if (rule->table == RT6_TABLE_UNSPEC)
258 if (fib6_new_table(net, rule->table) == NULL) {
265 rule6->src.addr = nla_get_in6_addr(tb[FRA_SRC]);
268 rule6->dst.addr = nla_get_in6_addr(tb[FRA_DST]);
270 rule6->src.plen = frh->src_len;
271 rule6->dst.plen = frh->dst_len;
272 rule6->tclass = frh->tos;
274 if (fib_rule_requires_fldissect(rule))
275 net->ipv6.fib6_rules_require_fldissect++;
277 net->ipv6.fib6_has_custom_rules = true;
283 static int fib6_rule_delete(struct fib_rule *rule)
285 struct net *net = rule->fr_net;
287 if (net->ipv6.fib6_rules_require_fldissect &&
288 fib_rule_requires_fldissect(rule))
289 net->ipv6.fib6_rules_require_fldissect--;
294 static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
297 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
299 if (frh->src_len && (rule6->src.plen != frh->src_len))
302 if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
305 if (frh->tos && (rule6->tclass != frh->tos))
309 nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
313 nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
319 static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
320 struct fib_rule_hdr *frh)
322 struct fib6_rule *rule6 = (struct fib6_rule *) rule;
324 frh->dst_len = rule6->dst.plen;
325 frh->src_len = rule6->src.plen;
326 frh->tos = rule6->tclass;
328 if ((rule6->dst.plen &&
329 nla_put_in6_addr(skb, FRA_DST, &rule6->dst.addr)) ||
331 nla_put_in6_addr(skb, FRA_SRC, &rule6->src.addr)))
332 goto nla_put_failure;
339 static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
341 return nla_total_size(16) /* dst */
342 + nla_total_size(16); /* src */
345 static const struct fib_rules_ops __net_initconst fib6_rules_ops_template = {
347 .rule_size = sizeof(struct fib6_rule),
348 .addr_size = sizeof(struct in6_addr),
349 .action = fib6_rule_action,
350 .match = fib6_rule_match,
351 .suppress = fib6_rule_suppress,
352 .configure = fib6_rule_configure,
353 .delete = fib6_rule_delete,
354 .compare = fib6_rule_compare,
355 .fill = fib6_rule_fill,
356 .nlmsg_payload = fib6_rule_nlmsg_payload,
357 .nlgroup = RTNLGRP_IPV6_RULE,
358 .policy = fib6_rule_policy,
359 .owner = THIS_MODULE,
360 .fro_net = &init_net,
363 static int __net_init fib6_rules_net_init(struct net *net)
365 struct fib_rules_ops *ops;
368 ops = fib_rules_register(&fib6_rules_ops_template, net);
372 err = fib_default_rule_add(ops, 0, RT6_TABLE_LOCAL, 0);
374 goto out_fib6_rules_ops;
376 err = fib_default_rule_add(ops, 0x7FFE, RT6_TABLE_MAIN, 0);
378 goto out_fib6_rules_ops;
380 net->ipv6.fib6_rules_ops = ops;
381 net->ipv6.fib6_rules_require_fldissect = 0;
386 fib_rules_unregister(ops);
390 static void __net_exit fib6_rules_net_exit(struct net *net)
393 fib_rules_unregister(net->ipv6.fib6_rules_ops);
397 static struct pernet_operations fib6_rules_net_ops = {
398 .init = fib6_rules_net_init,
399 .exit = fib6_rules_net_exit,
402 int __init fib6_rules_init(void)
404 return register_pernet_subsys(&fib6_rules_net_ops);
408 void fib6_rules_cleanup(void)
410 unregister_pernet_subsys(&fib6_rules_net_ops);