Commit | Line | Data |
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101367c2 TG |
1 | /* |
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 | ||
101367c2 | 16 | #include <linux/netdevice.h> |
bc3b2d7f | 17 | #include <linux/export.h> |
101367c2 TG |
18 | |
19 | #include <net/fib_rules.h> | |
20 | #include <net/ipv6.h> | |
29f6af77 | 21 | #include <net/addrconf.h> |
101367c2 TG |
22 | #include <net/ip6_route.h> |
23 | #include <net/netlink.h> | |
24 | ||
911c8541 | 25 | struct fib6_rule { |
101367c2 TG |
26 | struct fib_rule common; |
27 | struct rt6key src; | |
28 | struct rt6key dst; | |
29 | u8 tclass; | |
30 | }; | |
31 | ||
4c9483b2 | 32 | struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6, |
58f09b78 | 33 | int flags, pol_lookup_t lookup) |
101367c2 TG |
34 | { |
35 | struct fib_lookup_arg arg = { | |
36 | .lookup_ptr = lookup, | |
2c1c0004 | 37 | .flags = FIB_LOOKUP_NOREF, |
101367c2 TG |
38 | }; |
39 | ||
4c9483b2 DM |
40 | fib_rules_lookup(net->ipv6.fib6_rules_ops, |
41 | flowi6_to_flowi(fl6), flags, &arg); | |
101367c2 | 42 | |
b1429553 | 43 | if (arg.result) |
40aa7b90 | 44 | return arg.result; |
b1429553 | 45 | |
d8d1f30b CG |
46 | dst_hold(&net->ipv6.ip6_null_entry->dst); |
47 | return &net->ipv6.ip6_null_entry->dst; | |
101367c2 TG |
48 | } |
49 | ||
8ce11e6a AB |
50 | static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp, |
51 | int flags, struct fib_lookup_arg *arg) | |
101367c2 | 52 | { |
4c9483b2 | 53 | struct flowi6 *flp6 = &flp->u.ip6; |
101367c2 TG |
54 | struct rt6_info *rt = NULL; |
55 | struct fib6_table *table; | |
8ed67789 | 56 | struct net *net = rule->fr_net; |
101367c2 | 57 | pol_lookup_t lookup = arg->lookup_ptr; |
46b3a421 | 58 | int err = 0; |
101367c2 TG |
59 | |
60 | switch (rule->action) { | |
61 | case FR_ACT_TO_TBL: | |
62 | break; | |
63 | case FR_ACT_UNREACHABLE: | |
46b3a421 | 64 | err = -ENETUNREACH; |
8ed67789 | 65 | rt = net->ipv6.ip6_null_entry; |
101367c2 TG |
66 | goto discard_pkt; |
67 | default: | |
68 | case FR_ACT_BLACKHOLE: | |
46b3a421 | 69 | err = -EINVAL; |
8ed67789 | 70 | rt = net->ipv6.ip6_blk_hole_entry; |
101367c2 TG |
71 | goto discard_pkt; |
72 | case FR_ACT_PROHIBIT: | |
46b3a421 | 73 | err = -EACCES; |
8ed67789 | 74 | rt = net->ipv6.ip6_prohibit_entry; |
101367c2 TG |
75 | goto discard_pkt; |
76 | } | |
77 | ||
8ed67789 | 78 | table = fib6_get_table(net, rule->table); |
46b3a421 HFS |
79 | if (!table) { |
80 | err = -EAGAIN; | |
81 | goto out; | |
82 | } | |
101367c2 | 83 | |
46b3a421 | 84 | rt = lookup(net, table, flp6, flags); |
8ed67789 | 85 | if (rt != net->ipv6.ip6_null_entry) { |
29f6af77 YH |
86 | 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; | |
7cbca67c | 95 | |
191cd582 | 96 | if (ipv6_dev_get_saddr(net, |
d8d1f30b | 97 | ip6_dst_idev(&rt->dst)->dev, |
4c9483b2 | 98 | &flp6->daddr, |
0c9a2ac1 | 99 | rt6_flags2srcprefs(flags), |
7cbca67c | 100 | &saddr)) |
29f6af77 YH |
101 | goto again; |
102 | if (!ipv6_prefix_equal(&saddr, &r->src.addr, | |
103 | r->src.plen)) | |
104 | goto again; | |
4e3fd7a0 | 105 | flp6->saddr = saddr; |
29f6af77 | 106 | } |
73ba57bf | 107 | err = rt->dst.error; |
101367c2 | 108 | goto out; |
29f6af77 YH |
109 | } |
110 | again: | |
94e187c0 | 111 | ip6_rt_put(rt); |
46b3a421 | 112 | err = -EAGAIN; |
3226f688 PM |
113 | rt = NULL; |
114 | goto out; | |
115 | ||
101367c2 | 116 | discard_pkt: |
d8d1f30b | 117 | dst_hold(&rt->dst); |
101367c2 TG |
118 | out: |
119 | arg->result = rt; | |
46b3a421 | 120 | return err; |
101367c2 TG |
121 | } |
122 | ||
7764a45a ST |
123 | static bool fib6_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg) |
124 | { | |
125 | struct rt6_info *rt = (struct rt6_info *) arg->result; | |
673498b8 ST |
126 | struct net_device *dev = NULL; |
127 | ||
128 | if (rt->rt6i_idev) | |
129 | dev = rt->rt6i_idev->dev; | |
130 | ||
7764a45a ST |
131 | /* do not accept result if the route does |
132 | * not meet the required prefix length | |
133 | */ | |
73f5698e | 134 | if (rt->rt6i_dst.plen <= rule->suppress_prefixlen) |
6ef94cfa ST |
135 | 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 | ||
145 | suppress_route: | |
04f0888d ST |
146 | ip6_rt_put(rt); |
147 | return true; | |
7764a45a | 148 | } |
101367c2 TG |
149 | |
150 | static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) | |
151 | { | |
152 | struct fib6_rule *r = (struct fib6_rule *) rule; | |
4c9483b2 | 153 | struct flowi6 *fl6 = &fl->u.ip6; |
101367c2 | 154 | |
adaa70bb | 155 | if (r->dst.plen && |
4c9483b2 | 156 | !ipv6_prefix_equal(&fl6->daddr, &r->dst.addr, r->dst.plen)) |
101367c2 TG |
157 | return 0; |
158 | ||
29f6af77 YH |
159 | /* |
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 | */ | |
adaa70bb | 164 | if (r->src.plen) { |
29f6af77 | 165 | if (flags & RT6_LOOKUP_F_HAS_SADDR) { |
4c9483b2 | 166 | if (!ipv6_prefix_equal(&fl6->saddr, &r->src.addr, |
29f6af77 YH |
167 | r->src.plen)) |
168 | return 0; | |
169 | } else if (!(r->common.flags & FIB_RULE_FIND_SADDR)) | |
adaa70bb TG |
170 | return 0; |
171 | } | |
101367c2 | 172 | |
d76ed22b | 173 | if (r->tclass && r->tclass != ip6_tclass(fl6->flowlabel)) |
2cc67cc7 YH |
174 | return 0; |
175 | ||
101367c2 TG |
176 | return 1; |
177 | } | |
178 | ||
ef7c79ed | 179 | static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = { |
1f6c9557 | 180 | FRA_GENERIC_POLICY, |
101367c2 TG |
181 | }; |
182 | ||
183 | static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb, | |
8b3521ee | 184 | struct fib_rule_hdr *frh, |
101367c2 TG |
185 | struct nlattr **tb) |
186 | { | |
187 | int err = -EINVAL; | |
3b1e0a65 | 188 | struct net *net = sock_net(skb->sk); |
101367c2 TG |
189 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; |
190 | ||
101367c2 TG |
191 | if (rule->action == FR_ACT_TO_TBL) { |
192 | if (rule->table == RT6_TABLE_UNSPEC) | |
193 | goto errout; | |
194 | ||
dcabb819 | 195 | if (fib6_new_table(net, rule->table) == NULL) { |
101367c2 TG |
196 | err = -ENOBUFS; |
197 | goto errout; | |
198 | } | |
199 | } | |
200 | ||
e1701c68 | 201 | if (frh->src_len) |
101367c2 TG |
202 | nla_memcpy(&rule6->src.addr, tb[FRA_SRC], |
203 | sizeof(struct in6_addr)); | |
204 | ||
e1701c68 | 205 | if (frh->dst_len) |
101367c2 TG |
206 | nla_memcpy(&rule6->dst.addr, tb[FRA_DST], |
207 | sizeof(struct in6_addr)); | |
208 | ||
209 | rule6->src.plen = frh->src_len; | |
210 | rule6->dst.plen = frh->dst_len; | |
211 | rule6->tclass = frh->tos; | |
212 | ||
213 | err = 0; | |
214 | errout: | |
215 | return err; | |
216 | } | |
217 | ||
218 | static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, | |
219 | struct nlattr **tb) | |
220 | { | |
221 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; | |
222 | ||
223 | if (frh->src_len && (rule6->src.plen != frh->src_len)) | |
224 | return 0; | |
225 | ||
226 | if (frh->dst_len && (rule6->dst.plen != frh->dst_len)) | |
227 | return 0; | |
228 | ||
229 | if (frh->tos && (rule6->tclass != frh->tos)) | |
230 | return 0; | |
231 | ||
e1701c68 | 232 | if (frh->src_len && |
101367c2 TG |
233 | nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr))) |
234 | return 0; | |
235 | ||
e1701c68 | 236 | if (frh->dst_len && |
101367c2 TG |
237 | nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr))) |
238 | return 0; | |
239 | ||
240 | return 1; | |
241 | } | |
242 | ||
243 | static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb, | |
04af8cf6 | 244 | struct fib_rule_hdr *frh) |
101367c2 TG |
245 | { |
246 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; | |
247 | ||
101367c2 TG |
248 | frh->dst_len = rule6->dst.plen; |
249 | frh->src_len = rule6->src.plen; | |
250 | frh->tos = rule6->tclass; | |
251 | ||
c78679e8 DM |
252 | if ((rule6->dst.plen && |
253 | nla_put(skb, FRA_DST, sizeof(struct in6_addr), | |
254 | &rule6->dst.addr)) || | |
255 | (rule6->src.plen && | |
256 | nla_put(skb, FRA_SRC, sizeof(struct in6_addr), | |
257 | &rule6->src.addr))) | |
258 | goto nla_put_failure; | |
101367c2 TG |
259 | return 0; |
260 | ||
261 | nla_put_failure: | |
262 | return -ENOBUFS; | |
263 | } | |
264 | ||
868d13ac | 265 | static u32 fib6_rule_default_pref(struct fib_rules_ops *ops) |
101367c2 TG |
266 | { |
267 | return 0x3FFF; | |
268 | } | |
269 | ||
339bf98f TG |
270 | static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule) |
271 | { | |
272 | return nla_total_size(16) /* dst */ | |
273 | + nla_total_size(16); /* src */ | |
274 | } | |
275 | ||
04a6f82c | 276 | static const struct fib_rules_ops __net_initconst fib6_rules_ops_template = { |
25239cee | 277 | .family = AF_INET6, |
101367c2 | 278 | .rule_size = sizeof(struct fib6_rule), |
e1701c68 | 279 | .addr_size = sizeof(struct in6_addr), |
101367c2 TG |
280 | .action = fib6_rule_action, |
281 | .match = fib6_rule_match, | |
7764a45a | 282 | .suppress = fib6_rule_suppress, |
101367c2 TG |
283 | .configure = fib6_rule_configure, |
284 | .compare = fib6_rule_compare, | |
285 | .fill = fib6_rule_fill, | |
286 | .default_pref = fib6_rule_default_pref, | |
339bf98f | 287 | .nlmsg_payload = fib6_rule_nlmsg_payload, |
101367c2 TG |
288 | .nlgroup = RTNLGRP_IPV6_RULE, |
289 | .policy = fib6_rule_policy, | |
101367c2 | 290 | .owner = THIS_MODULE, |
03592383 | 291 | .fro_net = &init_net, |
101367c2 TG |
292 | }; |
293 | ||
2c8c1e72 | 294 | static int __net_init fib6_rules_net_init(struct net *net) |
101367c2 | 295 | { |
e9c5158a | 296 | struct fib_rules_ops *ops; |
dcabb819 | 297 | int err = -ENOMEM; |
2994c638 | 298 | |
e9c5158a EB |
299 | ops = fib_rules_register(&fib6_rules_ops_template, net); |
300 | if (IS_ERR(ops)) | |
301 | return PTR_ERR(ops); | |
eb5564b8 | 302 | |
85b99092 | 303 | err = fib_default_rule_add(ops, 0, RT6_TABLE_LOCAL, 0); |
dcabb819 DL |
304 | if (err) |
305 | goto out_fib6_rules_ops; | |
9eb87f3f | 306 | |
85b99092 | 307 | err = fib_default_rule_add(ops, 0x7FFE, RT6_TABLE_MAIN, 0); |
dcabb819 | 308 | if (err) |
e9c5158a | 309 | goto out_fib6_rules_ops; |
9eb87f3f | 310 | |
85b99092 | 311 | net->ipv6.fib6_rules_ops = ops; |
9eb87f3f | 312 | out: |
dcabb819 | 313 | return err; |
9eb87f3f | 314 | |
dcabb819 | 315 | out_fib6_rules_ops: |
e9c5158a | 316 | fib_rules_unregister(ops); |
9eb87f3f | 317 | goto out; |
101367c2 TG |
318 | } |
319 | ||
2c8c1e72 | 320 | static void __net_exit fib6_rules_net_exit(struct net *net) |
dcabb819 DL |
321 | { |
322 | fib_rules_unregister(net->ipv6.fib6_rules_ops); | |
dcabb819 DL |
323 | } |
324 | ||
325 | static struct pernet_operations fib6_rules_net_ops = { | |
326 | .init = fib6_rules_net_init, | |
327 | .exit = fib6_rules_net_exit, | |
328 | }; | |
329 | ||
330 | int __init fib6_rules_init(void) | |
331 | { | |
332 | return register_pernet_subsys(&fib6_rules_net_ops); | |
333 | } | |
334 | ||
335 | ||
101367c2 TG |
336 | void fib6_rules_cleanup(void) |
337 | { | |
ff4e1fb0 | 338 | unregister_pernet_subsys(&fib6_rules_net_ops); |
101367c2 | 339 | } |