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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 | |
16 | #include <linux/netdevice.h> |
17 | #include <linux/export.h> |
18 | |
19 | #include <net/fib_rules.h> |
20 | #include <net/ipv6.h> |
21 | #include <net/addrconf.h> |
22 | #include <net/ip6_route.h> |
23 | #include <net/netlink.h> |
24 | |
25 | struct fib6_rule { |
26 | struct fib_rule common; |
27 | struct rt6key src; |
28 | struct rt6key dst; |
29 | u8 tclass; |
30 | }; |
31 | |
32 | struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6, |
33 | int flags, pol_lookup_t lookup) |
34 | { |
35 | struct fib_lookup_arg arg = { |
36 | .lookup_ptr = lookup, |
37 | .flags = FIB_LOOKUP_NOREF, |
38 | }; |
39 | |
40 | fib_rules_lookup(net->ipv6.fib6_rules_ops, |
41 | flowi6_to_flowi(fl6), flags, &arg); |
42 | |
43 | if (arg.result) |
44 | return arg.result; |
45 | |
46 | dst_hold(&net->ipv6.ip6_null_entry->dst); |
47 | return &net->ipv6.ip6_null_entry->dst; |
48 | } |
49 | |
50 | static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp, |
51 | int flags, struct fib_lookup_arg *arg) |
52 | { |
53 | struct flowi6 *flp6 = &flp->u.ip6; |
54 | struct rt6_info *rt = NULL; |
55 | struct fib6_table *table; |
56 | struct net *net = rule->fr_net; |
57 | pol_lookup_t lookup = arg->lookup_ptr; |
58 | int err = 0; |
59 | |
60 | switch (rule->action) { |
61 | case FR_ACT_TO_TBL: |
62 | break; |
63 | case FR_ACT_UNREACHABLE: |
64 | err = -ENETUNREACH; |
65 | rt = net->ipv6.ip6_null_entry; |
66 | goto discard_pkt; |
67 | default: |
68 | case FR_ACT_BLACKHOLE: |
69 | err = -EINVAL; |
70 | rt = net->ipv6.ip6_blk_hole_entry; |
71 | goto discard_pkt; |
72 | case FR_ACT_PROHIBIT: |
73 | err = -EACCES; |
74 | rt = net->ipv6.ip6_prohibit_entry; |
75 | goto discard_pkt; |
76 | } |
77 | |
78 | table = fib6_get_table(net, rule->table); |
79 | if (!table) { |
80 | err = -EAGAIN; |
81 | goto out; |
82 | } |
83 | |
84 | rt = lookup(net, table, flp6, flags); |
85 | if (rt != net->ipv6.ip6_null_entry) { |
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; |
95 | |
96 | if (ipv6_dev_get_saddr(net, |
97 | ip6_dst_idev(&rt->dst)->dev, |
98 | &flp6->daddr, |
99 | rt6_flags2srcprefs(flags), |
100 | &saddr)) |
101 | goto again; |
102 | if (!ipv6_prefix_equal(&saddr, &r->src.addr, |
103 | r->src.plen)) |
104 | goto again; |
105 | flp6->saddr = saddr; |
106 | } |
107 | goto out; |
108 | } |
109 | again: |
110 | ip6_rt_put(rt); |
111 | err = -EAGAIN; |
112 | rt = NULL; |
113 | goto out; |
114 | |
115 | discard_pkt: |
116 | dst_hold(&rt->dst); |
117 | out: |
118 | arg->result = rt; |
119 | return err; |
120 | } |
121 | |
122 | static bool fib6_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg) |
123 | { |
124 | struct rt6_info *rt = (struct rt6_info *) arg->result; |
125 | struct net_device *dev = rt->rt6i_idev->dev; |
126 | /* do not accept result if the route does |
127 | * not meet the required prefix length |
128 | */ |
129 | if (rt->rt6i_dst.plen <= rule->suppress_prefixlen) |
130 | goto suppress_route; |
131 | |
132 | /* do not accept result if the route uses a device |
133 | * belonging to a forbidden interface group |
134 | */ |
135 | if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup) |
136 | goto suppress_route; |
137 | |
138 | return false; |
139 | |
140 | suppress_route: |
141 | ip6_rt_put(rt); |
142 | return true; |
143 | } |
144 | |
145 | static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) |
146 | { |
147 | struct fib6_rule *r = (struct fib6_rule *) rule; |
148 | struct flowi6 *fl6 = &fl->u.ip6; |
149 | |
150 | if (r->dst.plen && |
151 | !ipv6_prefix_equal(&fl6->daddr, &r->dst.addr, r->dst.plen)) |
152 | return 0; |
153 | |
154 | /* |
155 | * If FIB_RULE_FIND_SADDR is set and we do not have a |
156 | * source address for the traffic, we defer check for |
157 | * source address. |
158 | */ |
159 | if (r->src.plen) { |
160 | if (flags & RT6_LOOKUP_F_HAS_SADDR) { |
161 | if (!ipv6_prefix_equal(&fl6->saddr, &r->src.addr, |
162 | r->src.plen)) |
163 | return 0; |
164 | } else if (!(r->common.flags & FIB_RULE_FIND_SADDR)) |
165 | return 0; |
166 | } |
167 | |
168 | if (r->tclass && r->tclass != ((ntohl(fl6->flowlabel) >> 20) & 0xff)) |
169 | return 0; |
170 | |
171 | return 1; |
172 | } |
173 | |
174 | static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = { |
175 | FRA_GENERIC_POLICY, |
176 | }; |
177 | |
178 | static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb, |
179 | struct fib_rule_hdr *frh, |
180 | struct nlattr **tb) |
181 | { |
182 | int err = -EINVAL; |
183 | struct net *net = sock_net(skb->sk); |
184 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; |
185 | |
186 | if (rule->action == FR_ACT_TO_TBL) { |
187 | if (rule->table == RT6_TABLE_UNSPEC) |
188 | goto errout; |
189 | |
190 | if (fib6_new_table(net, rule->table) == NULL) { |
191 | err = -ENOBUFS; |
192 | goto errout; |
193 | } |
194 | } |
195 | |
196 | if (frh->src_len) |
197 | nla_memcpy(&rule6->src.addr, tb[FRA_SRC], |
198 | sizeof(struct in6_addr)); |
199 | |
200 | if (frh->dst_len) |
201 | nla_memcpy(&rule6->dst.addr, tb[FRA_DST], |
202 | sizeof(struct in6_addr)); |
203 | |
204 | rule6->src.plen = frh->src_len; |
205 | rule6->dst.plen = frh->dst_len; |
206 | rule6->tclass = frh->tos; |
207 | |
208 | err = 0; |
209 | errout: |
210 | return err; |
211 | } |
212 | |
213 | static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, |
214 | struct nlattr **tb) |
215 | { |
216 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; |
217 | |
218 | if (frh->src_len && (rule6->src.plen != frh->src_len)) |
219 | return 0; |
220 | |
221 | if (frh->dst_len && (rule6->dst.plen != frh->dst_len)) |
222 | return 0; |
223 | |
224 | if (frh->tos && (rule6->tclass != frh->tos)) |
225 | return 0; |
226 | |
227 | if (frh->src_len && |
228 | nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr))) |
229 | return 0; |
230 | |
231 | if (frh->dst_len && |
232 | nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr))) |
233 | return 0; |
234 | |
235 | return 1; |
236 | } |
237 | |
238 | static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb, |
239 | struct fib_rule_hdr *frh) |
240 | { |
241 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; |
242 | |
243 | frh->dst_len = rule6->dst.plen; |
244 | frh->src_len = rule6->src.plen; |
245 | frh->tos = rule6->tclass; |
246 | |
247 | if ((rule6->dst.plen && |
248 | nla_put(skb, FRA_DST, sizeof(struct in6_addr), |
249 | &rule6->dst.addr)) || |
250 | (rule6->src.plen && |
251 | nla_put(skb, FRA_SRC, sizeof(struct in6_addr), |
252 | &rule6->src.addr))) |
253 | goto nla_put_failure; |
254 | return 0; |
255 | |
256 | nla_put_failure: |
257 | return -ENOBUFS; |
258 | } |
259 | |
260 | static u32 fib6_rule_default_pref(struct fib_rules_ops *ops) |
261 | { |
262 | return 0x3FFF; |
263 | } |
264 | |
265 | static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule) |
266 | { |
267 | return nla_total_size(16) /* dst */ |
268 | + nla_total_size(16); /* src */ |
269 | } |
270 | |
271 | static const struct fib_rules_ops __net_initconst fib6_rules_ops_template = { |
272 | .family = AF_INET6, |
273 | .rule_size = sizeof(struct fib6_rule), |
274 | .addr_size = sizeof(struct in6_addr), |
275 | .action = fib6_rule_action, |
276 | .match = fib6_rule_match, |
277 | .suppress = fib6_rule_suppress, |
278 | .configure = fib6_rule_configure, |
279 | .compare = fib6_rule_compare, |
280 | .fill = fib6_rule_fill, |
281 | .default_pref = fib6_rule_default_pref, |
282 | .nlmsg_payload = fib6_rule_nlmsg_payload, |
283 | .nlgroup = RTNLGRP_IPV6_RULE, |
284 | .policy = fib6_rule_policy, |
285 | .owner = THIS_MODULE, |
286 | .fro_net = &init_net, |
287 | }; |
288 | |
289 | static int __net_init fib6_rules_net_init(struct net *net) |
290 | { |
291 | struct fib_rules_ops *ops; |
292 | int err = -ENOMEM; |
293 | |
294 | ops = fib_rules_register(&fib6_rules_ops_template, net); |
295 | if (IS_ERR(ops)) |
296 | return PTR_ERR(ops); |
297 | net->ipv6.fib6_rules_ops = ops; |
298 | |
299 | |
300 | err = fib_default_rule_add(net->ipv6.fib6_rules_ops, 0, |
301 | RT6_TABLE_LOCAL, 0); |
302 | if (err) |
303 | goto out_fib6_rules_ops; |
304 | |
305 | err = fib_default_rule_add(net->ipv6.fib6_rules_ops, |
306 | 0x7FFE, RT6_TABLE_MAIN, 0); |
307 | if (err) |
308 | goto out_fib6_rules_ops; |
309 | |
310 | out: |
311 | return err; |
312 | |
313 | out_fib6_rules_ops: |
314 | fib_rules_unregister(ops); |
315 | goto out; |
316 | } |
317 | |
318 | static void __net_exit fib6_rules_net_exit(struct net *net) |
319 | { |
320 | fib_rules_unregister(net->ipv6.fib6_rules_ops); |
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 | |
334 | void fib6_rules_cleanup(void) |
335 | { |
336 | unregister_pernet_subsys(&fib6_rules_net_ops); |
337 | } |
338 |
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