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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 | ||
9ee0034b DA |
40 | /* update flow if oif or iif point to device enslaved to l3mdev */ |
41 | l3mdev_update_flow(net, flowi6_to_flowi(fl6)); | |
42 | ||
4c9483b2 DM |
43 | fib_rules_lookup(net->ipv6.fib6_rules_ops, |
44 | flowi6_to_flowi(fl6), flags, &arg); | |
101367c2 | 45 | |
07f61557 SP |
46 | if (arg.result) |
47 | return arg.result; | |
b1429553 | 48 | |
07f61557 SP |
49 | dst_hold(&net->ipv6.ip6_null_entry->dst); |
50 | return &net->ipv6.ip6_null_entry->dst; | |
101367c2 TG |
51 | } |
52 | ||
8ce11e6a AB |
53 | static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp, |
54 | int flags, struct fib_lookup_arg *arg) | |
101367c2 | 55 | { |
4c9483b2 | 56 | struct flowi6 *flp6 = &flp->u.ip6; |
101367c2 TG |
57 | struct rt6_info *rt = NULL; |
58 | struct fib6_table *table; | |
8ed67789 | 59 | struct net *net = rule->fr_net; |
101367c2 | 60 | pol_lookup_t lookup = arg->lookup_ptr; |
46b3a421 | 61 | int err = 0; |
96c63fa7 | 62 | u32 tb_id; |
101367c2 TG |
63 | |
64 | switch (rule->action) { | |
65 | case FR_ACT_TO_TBL: | |
66 | break; | |
67 | case FR_ACT_UNREACHABLE: | |
46b3a421 | 68 | err = -ENETUNREACH; |
8ed67789 | 69 | rt = net->ipv6.ip6_null_entry; |
101367c2 TG |
70 | goto discard_pkt; |
71 | default: | |
72 | case FR_ACT_BLACKHOLE: | |
46b3a421 | 73 | err = -EINVAL; |
8ed67789 | 74 | rt = net->ipv6.ip6_blk_hole_entry; |
101367c2 TG |
75 | goto discard_pkt; |
76 | case FR_ACT_PROHIBIT: | |
46b3a421 | 77 | err = -EACCES; |
8ed67789 | 78 | rt = net->ipv6.ip6_prohibit_entry; |
101367c2 TG |
79 | goto discard_pkt; |
80 | } | |
81 | ||
96c63fa7 DA |
82 | tb_id = fib_rule_get_table(rule, arg); |
83 | table = fib6_get_table(net, tb_id); | |
46b3a421 HFS |
84 | if (!table) { |
85 | err = -EAGAIN; | |
86 | goto out; | |
87 | } | |
101367c2 | 88 | |
46b3a421 | 89 | rt = lookup(net, table, flp6, flags); |
8ed67789 | 90 | if (rt != net->ipv6.ip6_null_entry) { |
29f6af77 YH |
91 | struct fib6_rule *r = (struct fib6_rule *)rule; |
92 | ||
93 | /* | |
94 | * If we need to find a source address for this traffic, | |
95 | * we check the result if it meets requirement of the rule. | |
96 | */ | |
97 | if ((rule->flags & FIB_RULE_FIND_SADDR) && | |
98 | r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) { | |
99 | struct in6_addr saddr; | |
7cbca67c | 100 | |
191cd582 | 101 | if (ipv6_dev_get_saddr(net, |
d8d1f30b | 102 | ip6_dst_idev(&rt->dst)->dev, |
4c9483b2 | 103 | &flp6->daddr, |
0c9a2ac1 | 104 | rt6_flags2srcprefs(flags), |
7cbca67c | 105 | &saddr)) |
29f6af77 YH |
106 | goto again; |
107 | if (!ipv6_prefix_equal(&saddr, &r->src.addr, | |
108 | r->src.plen)) | |
109 | goto again; | |
4e3fd7a0 | 110 | flp6->saddr = saddr; |
29f6af77 | 111 | } |
73ba57bf | 112 | err = rt->dst.error; |
07f61557 SP |
113 | if (err != -EAGAIN) |
114 | goto out; | |
29f6af77 YH |
115 | } |
116 | again: | |
94e187c0 | 117 | ip6_rt_put(rt); |
46b3a421 | 118 | err = -EAGAIN; |
3226f688 PM |
119 | rt = NULL; |
120 | goto out; | |
121 | ||
101367c2 | 122 | discard_pkt: |
d8d1f30b | 123 | dst_hold(&rt->dst); |
101367c2 TG |
124 | out: |
125 | arg->result = rt; | |
46b3a421 | 126 | return err; |
101367c2 TG |
127 | } |
128 | ||
7764a45a ST |
129 | static bool fib6_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg) |
130 | { | |
131 | struct rt6_info *rt = (struct rt6_info *) arg->result; | |
673498b8 ST |
132 | struct net_device *dev = NULL; |
133 | ||
134 | if (rt->rt6i_idev) | |
135 | dev = rt->rt6i_idev->dev; | |
136 | ||
7764a45a ST |
137 | /* do not accept result if the route does |
138 | * not meet the required prefix length | |
139 | */ | |
73f5698e | 140 | if (rt->rt6i_dst.plen <= rule->suppress_prefixlen) |
6ef94cfa ST |
141 | goto suppress_route; |
142 | ||
143 | /* do not accept result if the route uses a device | |
144 | * belonging to a forbidden interface group | |
145 | */ | |
146 | if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup) | |
147 | goto suppress_route; | |
148 | ||
149 | return false; | |
150 | ||
151 | suppress_route: | |
04f0888d ST |
152 | ip6_rt_put(rt); |
153 | return true; | |
7764a45a | 154 | } |
101367c2 TG |
155 | |
156 | static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) | |
157 | { | |
158 | struct fib6_rule *r = (struct fib6_rule *) rule; | |
4c9483b2 | 159 | struct flowi6 *fl6 = &fl->u.ip6; |
101367c2 | 160 | |
adaa70bb | 161 | if (r->dst.plen && |
4c9483b2 | 162 | !ipv6_prefix_equal(&fl6->daddr, &r->dst.addr, r->dst.plen)) |
101367c2 TG |
163 | return 0; |
164 | ||
29f6af77 YH |
165 | /* |
166 | * If FIB_RULE_FIND_SADDR is set and we do not have a | |
167 | * source address for the traffic, we defer check for | |
168 | * source address. | |
169 | */ | |
adaa70bb | 170 | if (r->src.plen) { |
29f6af77 | 171 | if (flags & RT6_LOOKUP_F_HAS_SADDR) { |
4c9483b2 | 172 | if (!ipv6_prefix_equal(&fl6->saddr, &r->src.addr, |
29f6af77 YH |
173 | r->src.plen)) |
174 | return 0; | |
175 | } else if (!(r->common.flags & FIB_RULE_FIND_SADDR)) | |
adaa70bb TG |
176 | return 0; |
177 | } | |
101367c2 | 178 | |
d76ed22b | 179 | if (r->tclass && r->tclass != ip6_tclass(fl6->flowlabel)) |
2cc67cc7 YH |
180 | return 0; |
181 | ||
101367c2 TG |
182 | return 1; |
183 | } | |
184 | ||
ef7c79ed | 185 | static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = { |
1f6c9557 | 186 | FRA_GENERIC_POLICY, |
101367c2 TG |
187 | }; |
188 | ||
189 | static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb, | |
8b3521ee | 190 | struct fib_rule_hdr *frh, |
101367c2 TG |
191 | struct nlattr **tb) |
192 | { | |
193 | int err = -EINVAL; | |
3b1e0a65 | 194 | struct net *net = sock_net(skb->sk); |
101367c2 TG |
195 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; |
196 | ||
96c63fa7 | 197 | if (rule->action == FR_ACT_TO_TBL && !rule->l3mdev) { |
101367c2 TG |
198 | if (rule->table == RT6_TABLE_UNSPEC) |
199 | goto errout; | |
200 | ||
dcabb819 | 201 | if (fib6_new_table(net, rule->table) == NULL) { |
101367c2 TG |
202 | err = -ENOBUFS; |
203 | goto errout; | |
204 | } | |
205 | } | |
206 | ||
e1701c68 | 207 | if (frh->src_len) |
67b61f6c | 208 | rule6->src.addr = nla_get_in6_addr(tb[FRA_SRC]); |
101367c2 | 209 | |
e1701c68 | 210 | if (frh->dst_len) |
67b61f6c | 211 | rule6->dst.addr = nla_get_in6_addr(tb[FRA_DST]); |
101367c2 TG |
212 | |
213 | rule6->src.plen = frh->src_len; | |
214 | rule6->dst.plen = frh->dst_len; | |
215 | rule6->tclass = frh->tos; | |
216 | ||
217 | err = 0; | |
218 | errout: | |
219 | return err; | |
220 | } | |
221 | ||
222 | static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, | |
223 | struct nlattr **tb) | |
224 | { | |
225 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; | |
226 | ||
227 | if (frh->src_len && (rule6->src.plen != frh->src_len)) | |
228 | return 0; | |
229 | ||
230 | if (frh->dst_len && (rule6->dst.plen != frh->dst_len)) | |
231 | return 0; | |
232 | ||
233 | if (frh->tos && (rule6->tclass != frh->tos)) | |
234 | return 0; | |
235 | ||
e1701c68 | 236 | if (frh->src_len && |
101367c2 TG |
237 | nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr))) |
238 | return 0; | |
239 | ||
e1701c68 | 240 | if (frh->dst_len && |
101367c2 TG |
241 | nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr))) |
242 | return 0; | |
243 | ||
244 | return 1; | |
245 | } | |
246 | ||
247 | static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb, | |
04af8cf6 | 248 | struct fib_rule_hdr *frh) |
101367c2 TG |
249 | { |
250 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; | |
251 | ||
101367c2 TG |
252 | frh->dst_len = rule6->dst.plen; |
253 | frh->src_len = rule6->src.plen; | |
254 | frh->tos = rule6->tclass; | |
255 | ||
c78679e8 | 256 | if ((rule6->dst.plen && |
930345ea | 257 | nla_put_in6_addr(skb, FRA_DST, &rule6->dst.addr)) || |
c78679e8 | 258 | (rule6->src.plen && |
930345ea | 259 | nla_put_in6_addr(skb, FRA_SRC, &rule6->src.addr))) |
c78679e8 | 260 | goto nla_put_failure; |
101367c2 TG |
261 | return 0; |
262 | ||
263 | nla_put_failure: | |
264 | return -ENOBUFS; | |
265 | } | |
266 | ||
339bf98f TG |
267 | static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule) |
268 | { | |
269 | return nla_total_size(16) /* dst */ | |
270 | + nla_total_size(16); /* src */ | |
271 | } | |
272 | ||
04a6f82c | 273 | static const struct fib_rules_ops __net_initconst fib6_rules_ops_template = { |
25239cee | 274 | .family = AF_INET6, |
101367c2 | 275 | .rule_size = sizeof(struct fib6_rule), |
e1701c68 | 276 | .addr_size = sizeof(struct in6_addr), |
101367c2 TG |
277 | .action = fib6_rule_action, |
278 | .match = fib6_rule_match, | |
7764a45a | 279 | .suppress = fib6_rule_suppress, |
101367c2 TG |
280 | .configure = fib6_rule_configure, |
281 | .compare = fib6_rule_compare, | |
282 | .fill = fib6_rule_fill, | |
339bf98f | 283 | .nlmsg_payload = fib6_rule_nlmsg_payload, |
101367c2 TG |
284 | .nlgroup = RTNLGRP_IPV6_RULE, |
285 | .policy = fib6_rule_policy, | |
101367c2 | 286 | .owner = THIS_MODULE, |
03592383 | 287 | .fro_net = &init_net, |
101367c2 TG |
288 | }; |
289 | ||
2c8c1e72 | 290 | static int __net_init fib6_rules_net_init(struct net *net) |
101367c2 | 291 | { |
e9c5158a | 292 | struct fib_rules_ops *ops; |
dcabb819 | 293 | int err = -ENOMEM; |
2994c638 | 294 | |
e9c5158a EB |
295 | ops = fib_rules_register(&fib6_rules_ops_template, net); |
296 | if (IS_ERR(ops)) | |
297 | return PTR_ERR(ops); | |
eb5564b8 | 298 | |
85b99092 | 299 | err = fib_default_rule_add(ops, 0, RT6_TABLE_LOCAL, 0); |
dcabb819 DL |
300 | if (err) |
301 | goto out_fib6_rules_ops; | |
9eb87f3f | 302 | |
85b99092 | 303 | err = fib_default_rule_add(ops, 0x7FFE, RT6_TABLE_MAIN, 0); |
dcabb819 | 304 | if (err) |
e9c5158a | 305 | goto out_fib6_rules_ops; |
9eb87f3f | 306 | |
85b99092 | 307 | net->ipv6.fib6_rules_ops = ops; |
9eb87f3f | 308 | out: |
dcabb819 | 309 | return err; |
9eb87f3f | 310 | |
dcabb819 | 311 | out_fib6_rules_ops: |
e9c5158a | 312 | fib_rules_unregister(ops); |
9eb87f3f | 313 | goto out; |
101367c2 TG |
314 | } |
315 | ||
2c8c1e72 | 316 | static void __net_exit fib6_rules_net_exit(struct net *net) |
dcabb819 | 317 | { |
419df12f | 318 | rtnl_lock(); |
dcabb819 | 319 | fib_rules_unregister(net->ipv6.fib6_rules_ops); |
419df12f | 320 | rtnl_unlock(); |
dcabb819 DL |
321 | } |
322 | ||
323 | static struct pernet_operations fib6_rules_net_ops = { | |
324 | .init = fib6_rules_net_init, | |
325 | .exit = fib6_rules_net_exit, | |
326 | }; | |
327 | ||
328 | int __init fib6_rules_init(void) | |
329 | { | |
330 | return register_pernet_subsys(&fib6_rules_net_ops); | |
331 | } | |
332 | ||
333 | ||
101367c2 TG |
334 | void fib6_rules_cleanup(void) |
335 | { | |
ff4e1fb0 | 336 | unregister_pernet_subsys(&fib6_rules_net_ops); |
101367c2 | 337 | } |