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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 | |
18 | #include <net/fib_rules.h> |
19 | #include <net/ipv6.h> |
20 | #include <net/addrconf.h> |
21 | #include <net/ip6_route.h> |
22 | #include <net/netlink.h> |
23 | |
24 | struct fib6_rule |
25 | { |
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 flowi *fl, |
33 | int flags, pol_lookup_t lookup) |
34 | { |
35 | struct fib_lookup_arg arg = { |
36 | .lookup_ptr = lookup, |
37 | }; |
38 | |
39 | fib_rules_lookup(net->ipv6.fib6_rules_ops, fl, flags, &arg); |
40 | if (arg.rule) |
41 | fib_rule_put(arg.rule); |
42 | |
43 | if (arg.result) |
44 | return arg.result; |
45 | |
46 | dst_hold(&net->ipv6.ip6_null_entry->u.dst); |
47 | return &net->ipv6.ip6_null_entry->u.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 rt6_info *rt = NULL; |
54 | struct fib6_table *table; |
55 | struct net *net = rule->fr_net; |
56 | pol_lookup_t lookup = arg->lookup_ptr; |
57 | |
58 | switch (rule->action) { |
59 | case FR_ACT_TO_TBL: |
60 | break; |
61 | case FR_ACT_UNREACHABLE: |
62 | rt = net->ipv6.ip6_null_entry; |
63 | goto discard_pkt; |
64 | default: |
65 | case FR_ACT_BLACKHOLE: |
66 | rt = net->ipv6.ip6_blk_hole_entry; |
67 | goto discard_pkt; |
68 | case FR_ACT_PROHIBIT: |
69 | rt = net->ipv6.ip6_prohibit_entry; |
70 | goto discard_pkt; |
71 | } |
72 | |
73 | table = fib6_get_table(net, rule->table); |
74 | if (table) |
75 | rt = lookup(net, table, flp, flags); |
76 | |
77 | if (rt != net->ipv6.ip6_null_entry) { |
78 | struct fib6_rule *r = (struct fib6_rule *)rule; |
79 | |
80 | /* |
81 | * If we need to find a source address for this traffic, |
82 | * we check the result if it meets requirement of the rule. |
83 | */ |
84 | if ((rule->flags & FIB_RULE_FIND_SADDR) && |
85 | r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) { |
86 | struct in6_addr saddr; |
87 | |
88 | if (ipv6_dev_get_saddr(net, |
89 | ip6_dst_idev(&rt->u.dst)->dev, |
90 | &flp->fl6_dst, |
91 | rt6_flags2srcprefs(flags), |
92 | &saddr)) |
93 | goto again; |
94 | if (!ipv6_prefix_equal(&saddr, &r->src.addr, |
95 | r->src.plen)) |
96 | goto again; |
97 | ipv6_addr_copy(&flp->fl6_src, &saddr); |
98 | } |
99 | goto out; |
100 | } |
101 | again: |
102 | dst_release(&rt->u.dst); |
103 | rt = NULL; |
104 | goto out; |
105 | |
106 | discard_pkt: |
107 | dst_hold(&rt->u.dst); |
108 | out: |
109 | arg->result = rt; |
110 | return rt == NULL ? -EAGAIN : 0; |
111 | } |
112 | |
113 | |
114 | static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) |
115 | { |
116 | struct fib6_rule *r = (struct fib6_rule *) rule; |
117 | |
118 | if (r->dst.plen && |
119 | !ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen)) |
120 | return 0; |
121 | |
122 | /* |
123 | * If FIB_RULE_FIND_SADDR is set and we do not have a |
124 | * source address for the traffic, we defer check for |
125 | * source address. |
126 | */ |
127 | if (r->src.plen) { |
128 | if (flags & RT6_LOOKUP_F_HAS_SADDR) { |
129 | if (!ipv6_prefix_equal(&fl->fl6_src, &r->src.addr, |
130 | r->src.plen)) |
131 | return 0; |
132 | } else if (!(r->common.flags & FIB_RULE_FIND_SADDR)) |
133 | return 0; |
134 | } |
135 | |
136 | if (r->tclass && r->tclass != ((ntohl(fl->fl6_flowlabel) >> 20) & 0xff)) |
137 | return 0; |
138 | |
139 | return 1; |
140 | } |
141 | |
142 | static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = { |
143 | FRA_GENERIC_POLICY, |
144 | }; |
145 | |
146 | static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb, |
147 | struct fib_rule_hdr *frh, |
148 | struct nlattr **tb) |
149 | { |
150 | int err = -EINVAL; |
151 | struct net *net = sock_net(skb->sk); |
152 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; |
153 | |
154 | if (rule->action == FR_ACT_TO_TBL) { |
155 | if (rule->table == RT6_TABLE_UNSPEC) |
156 | goto errout; |
157 | |
158 | if (fib6_new_table(net, rule->table) == NULL) { |
159 | err = -ENOBUFS; |
160 | goto errout; |
161 | } |
162 | } |
163 | |
164 | if (frh->src_len) |
165 | nla_memcpy(&rule6->src.addr, tb[FRA_SRC], |
166 | sizeof(struct in6_addr)); |
167 | |
168 | if (frh->dst_len) |
169 | nla_memcpy(&rule6->dst.addr, tb[FRA_DST], |
170 | sizeof(struct in6_addr)); |
171 | |
172 | rule6->src.plen = frh->src_len; |
173 | rule6->dst.plen = frh->dst_len; |
174 | rule6->tclass = frh->tos; |
175 | |
176 | err = 0; |
177 | errout: |
178 | return err; |
179 | } |
180 | |
181 | static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, |
182 | struct nlattr **tb) |
183 | { |
184 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; |
185 | |
186 | if (frh->src_len && (rule6->src.plen != frh->src_len)) |
187 | return 0; |
188 | |
189 | if (frh->dst_len && (rule6->dst.plen != frh->dst_len)) |
190 | return 0; |
191 | |
192 | if (frh->tos && (rule6->tclass != frh->tos)) |
193 | return 0; |
194 | |
195 | if (frh->src_len && |
196 | nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr))) |
197 | return 0; |
198 | |
199 | if (frh->dst_len && |
200 | nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr))) |
201 | return 0; |
202 | |
203 | return 1; |
204 | } |
205 | |
206 | static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb, |
207 | struct fib_rule_hdr *frh) |
208 | { |
209 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; |
210 | |
211 | frh->family = AF_INET6; |
212 | frh->dst_len = rule6->dst.plen; |
213 | frh->src_len = rule6->src.plen; |
214 | frh->tos = rule6->tclass; |
215 | |
216 | if (rule6->dst.plen) |
217 | NLA_PUT(skb, FRA_DST, sizeof(struct in6_addr), |
218 | &rule6->dst.addr); |
219 | |
220 | if (rule6->src.plen) |
221 | NLA_PUT(skb, FRA_SRC, sizeof(struct in6_addr), |
222 | &rule6->src.addr); |
223 | |
224 | return 0; |
225 | |
226 | nla_put_failure: |
227 | return -ENOBUFS; |
228 | } |
229 | |
230 | static u32 fib6_rule_default_pref(struct fib_rules_ops *ops) |
231 | { |
232 | return 0x3FFF; |
233 | } |
234 | |
235 | static 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 | |
241 | static struct fib_rules_ops fib6_rules_ops_template = { |
242 | .family = AF_INET6, |
243 | .rule_size = sizeof(struct fib6_rule), |
244 | .addr_size = sizeof(struct in6_addr), |
245 | .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, |
251 | .nlmsg_payload = fib6_rule_nlmsg_payload, |
252 | .nlgroup = RTNLGRP_IPV6_RULE, |
253 | .policy = fib6_rule_policy, |
254 | .owner = THIS_MODULE, |
255 | .fro_net = &init_net, |
256 | }; |
257 | |
258 | static int __net_init fib6_rules_net_init(struct net *net) |
259 | { |
260 | struct fib_rules_ops *ops; |
261 | int err = -ENOMEM; |
262 | |
263 | 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; |
267 | |
268 | |
269 | err = fib_default_rule_add(net->ipv6.fib6_rules_ops, 0, |
270 | RT6_TABLE_LOCAL, 0); |
271 | 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) |
277 | goto out_fib6_rules_ops; |
278 | |
279 | out: |
280 | return err; |
281 | |
282 | out_fib6_rules_ops: |
283 | fib_rules_unregister(ops); |
284 | goto out; |
285 | } |
286 | |
287 | static void __net_exit fib6_rules_net_exit(struct net *net) |
288 | { |
289 | fib_rules_unregister(net->ipv6.fib6_rules_ops); |
290 | } |
291 | |
292 | static struct pernet_operations fib6_rules_net_ops = { |
293 | .init = fib6_rules_net_init, |
294 | .exit = fib6_rules_net_exit, |
295 | }; |
296 | |
297 | int __init fib6_rules_init(void) |
298 | { |
299 | return register_pernet_subsys(&fib6_rules_net_ops); |
300 | } |
301 | |
302 | |
303 | void fib6_rules_cleanup(void) |
304 | { |
305 | unregister_pernet_subsys(&fib6_rules_net_ops); |
306 | } |
307 |
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