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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 TG |
16 | #include <linux/netdevice.h> |
17 | ||
18 | #include <net/fib_rules.h> | |
19 | #include <net/ipv6.h> | |
29f6af77 | 20 | #include <net/addrconf.h> |
101367c2 TG |
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 | static struct fib_rules_ops fib6_rules_ops; | |
33 | ||
34 | static struct fib6_rule main_rule = { | |
35 | .common = { | |
36 | .refcnt = ATOMIC_INIT(2), | |
37 | .pref = 0x7FFE, | |
38 | .action = FR_ACT_TO_TBL, | |
39 | .table = RT6_TABLE_MAIN, | |
40 | }, | |
41 | }; | |
42 | ||
43 | static struct fib6_rule local_rule = { | |
44 | .common = { | |
45 | .refcnt = ATOMIC_INIT(2), | |
46 | .pref = 0, | |
47 | .action = FR_ACT_TO_TBL, | |
48 | .table = RT6_TABLE_LOCAL, | |
49 | .flags = FIB_RULE_PERMANENT, | |
50 | }, | |
51 | }; | |
52 | ||
53 | static LIST_HEAD(fib6_rules); | |
54 | ||
55 | struct dst_entry *fib6_rule_lookup(struct flowi *fl, int flags, | |
56 | pol_lookup_t lookup) | |
57 | { | |
58 | struct fib_lookup_arg arg = { | |
59 | .lookup_ptr = lookup, | |
60 | }; | |
61 | ||
62 | fib_rules_lookup(&fib6_rules_ops, fl, flags, &arg); | |
63 | if (arg.rule) | |
64 | fib_rule_put(arg.rule); | |
65 | ||
b1429553 | 66 | if (arg.result) |
40aa7b90 | 67 | return arg.result; |
b1429553 VN |
68 | |
69 | dst_hold(&ip6_null_entry.u.dst); | |
70 | return &ip6_null_entry.u.dst; | |
101367c2 TG |
71 | } |
72 | ||
8ce11e6a AB |
73 | static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp, |
74 | int flags, struct fib_lookup_arg *arg) | |
101367c2 TG |
75 | { |
76 | struct rt6_info *rt = NULL; | |
77 | struct fib6_table *table; | |
78 | pol_lookup_t lookup = arg->lookup_ptr; | |
79 | ||
80 | switch (rule->action) { | |
81 | case FR_ACT_TO_TBL: | |
82 | break; | |
83 | case FR_ACT_UNREACHABLE: | |
84 | rt = &ip6_null_entry; | |
85 | goto discard_pkt; | |
86 | default: | |
87 | case FR_ACT_BLACKHOLE: | |
88 | rt = &ip6_blk_hole_entry; | |
89 | goto discard_pkt; | |
90 | case FR_ACT_PROHIBIT: | |
91 | rt = &ip6_prohibit_entry; | |
92 | goto discard_pkt; | |
93 | } | |
94 | ||
95 | table = fib6_get_table(rule->table); | |
96 | if (table) | |
97 | rt = lookup(table, flp, flags); | |
98 | ||
29f6af77 YH |
99 | if (rt != &ip6_null_entry) { |
100 | struct fib6_rule *r = (struct fib6_rule *)rule; | |
101 | ||
102 | /* | |
103 | * If we need to find a source address for this traffic, | |
104 | * we check the result if it meets requirement of the rule. | |
105 | */ | |
106 | if ((rule->flags & FIB_RULE_FIND_SADDR) && | |
107 | r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) { | |
108 | struct in6_addr saddr; | |
109 | if (ipv6_get_saddr(&rt->u.dst, &flp->fl6_dst, | |
110 | &saddr)) | |
111 | goto again; | |
112 | if (!ipv6_prefix_equal(&saddr, &r->src.addr, | |
113 | r->src.plen)) | |
114 | goto again; | |
115 | ipv6_addr_copy(&flp->fl6_src, &saddr); | |
116 | } | |
101367c2 | 117 | goto out; |
29f6af77 YH |
118 | } |
119 | again: | |
101367c2 | 120 | dst_release(&rt->u.dst); |
3226f688 PM |
121 | rt = NULL; |
122 | goto out; | |
123 | ||
101367c2 TG |
124 | discard_pkt: |
125 | dst_hold(&rt->u.dst); | |
126 | out: | |
127 | arg->result = rt; | |
128 | return rt == NULL ? -EAGAIN : 0; | |
129 | } | |
130 | ||
131 | ||
132 | static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) | |
133 | { | |
134 | struct fib6_rule *r = (struct fib6_rule *) rule; | |
135 | ||
adaa70bb TG |
136 | if (r->dst.plen && |
137 | !ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen)) | |
101367c2 TG |
138 | return 0; |
139 | ||
29f6af77 YH |
140 | /* |
141 | * If FIB_RULE_FIND_SADDR is set and we do not have a | |
142 | * source address for the traffic, we defer check for | |
143 | * source address. | |
144 | */ | |
adaa70bb | 145 | if (r->src.plen) { |
29f6af77 YH |
146 | if (flags & RT6_LOOKUP_F_HAS_SADDR) { |
147 | if (!ipv6_prefix_equal(&fl->fl6_src, &r->src.addr, | |
148 | r->src.plen)) | |
149 | return 0; | |
150 | } else if (!(r->common.flags & FIB_RULE_FIND_SADDR)) | |
adaa70bb TG |
151 | return 0; |
152 | } | |
101367c2 | 153 | |
2cc67cc7 YH |
154 | if (r->tclass && r->tclass != ((ntohl(fl->fl6_flowlabel) >> 20) & 0xff)) |
155 | return 0; | |
156 | ||
101367c2 TG |
157 | return 1; |
158 | } | |
159 | ||
ef7c79ed | 160 | static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = { |
1f6c9557 | 161 | FRA_GENERIC_POLICY, |
101367c2 TG |
162 | }; |
163 | ||
164 | static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb, | |
165 | struct nlmsghdr *nlh, struct fib_rule_hdr *frh, | |
166 | struct nlattr **tb) | |
167 | { | |
168 | int err = -EINVAL; | |
169 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; | |
170 | ||
101367c2 TG |
171 | if (rule->action == FR_ACT_TO_TBL) { |
172 | if (rule->table == RT6_TABLE_UNSPEC) | |
173 | goto errout; | |
174 | ||
175 | if (fib6_new_table(rule->table) == NULL) { | |
176 | err = -ENOBUFS; | |
177 | goto errout; | |
178 | } | |
179 | } | |
180 | ||
e1701c68 | 181 | if (frh->src_len) |
101367c2 TG |
182 | nla_memcpy(&rule6->src.addr, tb[FRA_SRC], |
183 | sizeof(struct in6_addr)); | |
184 | ||
e1701c68 | 185 | if (frh->dst_len) |
101367c2 TG |
186 | nla_memcpy(&rule6->dst.addr, tb[FRA_DST], |
187 | sizeof(struct in6_addr)); | |
188 | ||
189 | rule6->src.plen = frh->src_len; | |
190 | rule6->dst.plen = frh->dst_len; | |
191 | rule6->tclass = frh->tos; | |
192 | ||
193 | err = 0; | |
194 | errout: | |
195 | return err; | |
196 | } | |
197 | ||
198 | static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, | |
199 | struct nlattr **tb) | |
200 | { | |
201 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; | |
202 | ||
203 | if (frh->src_len && (rule6->src.plen != frh->src_len)) | |
204 | return 0; | |
205 | ||
206 | if (frh->dst_len && (rule6->dst.plen != frh->dst_len)) | |
207 | return 0; | |
208 | ||
209 | if (frh->tos && (rule6->tclass != frh->tos)) | |
210 | return 0; | |
211 | ||
e1701c68 | 212 | if (frh->src_len && |
101367c2 TG |
213 | nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr))) |
214 | return 0; | |
215 | ||
e1701c68 | 216 | if (frh->dst_len && |
101367c2 TG |
217 | nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr))) |
218 | return 0; | |
219 | ||
220 | return 1; | |
221 | } | |
222 | ||
223 | static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb, | |
224 | struct nlmsghdr *nlh, struct fib_rule_hdr *frh) | |
225 | { | |
226 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; | |
227 | ||
228 | frh->family = AF_INET6; | |
229 | frh->dst_len = rule6->dst.plen; | |
230 | frh->src_len = rule6->src.plen; | |
231 | frh->tos = rule6->tclass; | |
232 | ||
233 | if (rule6->dst.plen) | |
234 | NLA_PUT(skb, FRA_DST, sizeof(struct in6_addr), | |
235 | &rule6->dst.addr); | |
236 | ||
237 | if (rule6->src.plen) | |
238 | NLA_PUT(skb, FRA_SRC, sizeof(struct in6_addr), | |
239 | &rule6->src.addr); | |
240 | ||
241 | return 0; | |
242 | ||
243 | nla_put_failure: | |
244 | return -ENOBUFS; | |
245 | } | |
246 | ||
101367c2 TG |
247 | static u32 fib6_rule_default_pref(void) |
248 | { | |
249 | return 0x3FFF; | |
250 | } | |
251 | ||
339bf98f TG |
252 | static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule) |
253 | { | |
254 | return nla_total_size(16) /* dst */ | |
255 | + nla_total_size(16); /* src */ | |
256 | } | |
257 | ||
101367c2 TG |
258 | static struct fib_rules_ops fib6_rules_ops = { |
259 | .family = AF_INET6, | |
260 | .rule_size = sizeof(struct fib6_rule), | |
e1701c68 | 261 | .addr_size = sizeof(struct in6_addr), |
101367c2 TG |
262 | .action = fib6_rule_action, |
263 | .match = fib6_rule_match, | |
264 | .configure = fib6_rule_configure, | |
265 | .compare = fib6_rule_compare, | |
266 | .fill = fib6_rule_fill, | |
267 | .default_pref = fib6_rule_default_pref, | |
339bf98f | 268 | .nlmsg_payload = fib6_rule_nlmsg_payload, |
101367c2 TG |
269 | .nlgroup = RTNLGRP_IPV6_RULE, |
270 | .policy = fib6_rule_policy, | |
271 | .rules_list = &fib6_rules, | |
272 | .owner = THIS_MODULE, | |
273 | }; | |
274 | ||
275 | void __init fib6_rules_init(void) | |
276 | { | |
277 | list_add_tail(&local_rule.common.list, &fib6_rules); | |
278 | list_add_tail(&main_rule.common.list, &fib6_rules); | |
279 | ||
280 | fib_rules_register(&fib6_rules_ops); | |
281 | } | |
282 | ||
283 | void fib6_rules_cleanup(void) | |
284 | { | |
285 | fib_rules_unregister(&fib6_rules_ops); | |
286 | } |