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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/config.h> | |
17 | #include <linux/netdevice.h> | |
18 | ||
19 | #include <net/fib_rules.h> | |
20 | #include <net/ipv6.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 | 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 | ||
66 | return (struct dst_entry *) arg.result; | |
67 | } | |
68 | ||
69 | int fib6_rule_action(struct fib_rule *rule, struct flowi *flp, | |
70 | int flags, struct fib_lookup_arg *arg) | |
71 | { | |
72 | struct rt6_info *rt = NULL; | |
73 | struct fib6_table *table; | |
74 | pol_lookup_t lookup = arg->lookup_ptr; | |
75 | ||
76 | switch (rule->action) { | |
77 | case FR_ACT_TO_TBL: | |
78 | break; | |
79 | case FR_ACT_UNREACHABLE: | |
80 | rt = &ip6_null_entry; | |
81 | goto discard_pkt; | |
82 | default: | |
83 | case FR_ACT_BLACKHOLE: | |
84 | rt = &ip6_blk_hole_entry; | |
85 | goto discard_pkt; | |
86 | case FR_ACT_PROHIBIT: | |
87 | rt = &ip6_prohibit_entry; | |
88 | goto discard_pkt; | |
89 | } | |
90 | ||
91 | table = fib6_get_table(rule->table); | |
92 | if (table) | |
93 | rt = lookup(table, flp, flags); | |
94 | ||
95 | if (rt != &ip6_null_entry) | |
96 | goto out; | |
97 | ||
98 | dst_release(&rt->u.dst); | |
99 | discard_pkt: | |
100 | dst_hold(&rt->u.dst); | |
101 | out: | |
102 | arg->result = rt; | |
103 | return rt == NULL ? -EAGAIN : 0; | |
104 | } | |
105 | ||
106 | ||
107 | static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) | |
108 | { | |
109 | struct fib6_rule *r = (struct fib6_rule *) rule; | |
110 | ||
111 | if (!ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen)) | |
112 | return 0; | |
113 | ||
114 | if ((flags & RT6_F_HAS_SADDR) && | |
115 | !ipv6_prefix_equal(&fl->fl6_src, &r->src.addr, r->src.plen)) | |
116 | return 0; | |
117 | ||
118 | return 1; | |
119 | } | |
120 | ||
121 | static struct nla_policy fib6_rule_policy[RTA_MAX+1] __read_mostly = { | |
122 | [FRA_IFNAME] = { .type = NLA_STRING }, | |
123 | [FRA_PRIORITY] = { .type = NLA_U32 }, | |
124 | [FRA_SRC] = { .minlen = sizeof(struct in6_addr) }, | |
125 | [FRA_DST] = { .minlen = sizeof(struct in6_addr) }, | |
126 | }; | |
127 | ||
128 | static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb, | |
129 | struct nlmsghdr *nlh, struct fib_rule_hdr *frh, | |
130 | struct nlattr **tb) | |
131 | { | |
132 | int err = -EINVAL; | |
133 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; | |
134 | ||
135 | if (frh->src_len > 128 || frh->dst_len > 128 || | |
136 | (frh->tos & ~IPV6_FLOWINFO_MASK)) | |
137 | goto errout; | |
138 | ||
139 | if (rule->action == FR_ACT_TO_TBL) { | |
140 | if (rule->table == RT6_TABLE_UNSPEC) | |
141 | goto errout; | |
142 | ||
143 | if (fib6_new_table(rule->table) == NULL) { | |
144 | err = -ENOBUFS; | |
145 | goto errout; | |
146 | } | |
147 | } | |
148 | ||
149 | if (tb[FRA_SRC]) | |
150 | nla_memcpy(&rule6->src.addr, tb[FRA_SRC], | |
151 | sizeof(struct in6_addr)); | |
152 | ||
153 | if (tb[FRA_DST]) | |
154 | nla_memcpy(&rule6->dst.addr, tb[FRA_DST], | |
155 | sizeof(struct in6_addr)); | |
156 | ||
157 | rule6->src.plen = frh->src_len; | |
158 | rule6->dst.plen = frh->dst_len; | |
159 | rule6->tclass = frh->tos; | |
160 | ||
161 | err = 0; | |
162 | errout: | |
163 | return err; | |
164 | } | |
165 | ||
166 | static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, | |
167 | struct nlattr **tb) | |
168 | { | |
169 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; | |
170 | ||
171 | if (frh->src_len && (rule6->src.plen != frh->src_len)) | |
172 | return 0; | |
173 | ||
174 | if (frh->dst_len && (rule6->dst.plen != frh->dst_len)) | |
175 | return 0; | |
176 | ||
177 | if (frh->tos && (rule6->tclass != frh->tos)) | |
178 | return 0; | |
179 | ||
180 | if (tb[FRA_SRC] && | |
181 | nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr))) | |
182 | return 0; | |
183 | ||
184 | if (tb[FRA_DST] && | |
185 | nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr))) | |
186 | return 0; | |
187 | ||
188 | return 1; | |
189 | } | |
190 | ||
191 | static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb, | |
192 | struct nlmsghdr *nlh, struct fib_rule_hdr *frh) | |
193 | { | |
194 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; | |
195 | ||
196 | frh->family = AF_INET6; | |
197 | frh->dst_len = rule6->dst.plen; | |
198 | frh->src_len = rule6->src.plen; | |
199 | frh->tos = rule6->tclass; | |
200 | ||
201 | if (rule6->dst.plen) | |
202 | NLA_PUT(skb, FRA_DST, sizeof(struct in6_addr), | |
203 | &rule6->dst.addr); | |
204 | ||
205 | if (rule6->src.plen) | |
206 | NLA_PUT(skb, FRA_SRC, sizeof(struct in6_addr), | |
207 | &rule6->src.addr); | |
208 | ||
209 | return 0; | |
210 | ||
211 | nla_put_failure: | |
212 | return -ENOBUFS; | |
213 | } | |
214 | ||
215 | int fib6_rules_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
216 | { | |
217 | return fib_rules_dump(skb, cb, AF_INET6); | |
218 | } | |
219 | ||
220 | static u32 fib6_rule_default_pref(void) | |
221 | { | |
222 | return 0x3FFF; | |
223 | } | |
224 | ||
225 | static struct fib_rules_ops fib6_rules_ops = { | |
226 | .family = AF_INET6, | |
227 | .rule_size = sizeof(struct fib6_rule), | |
228 | .action = fib6_rule_action, | |
229 | .match = fib6_rule_match, | |
230 | .configure = fib6_rule_configure, | |
231 | .compare = fib6_rule_compare, | |
232 | .fill = fib6_rule_fill, | |
233 | .default_pref = fib6_rule_default_pref, | |
234 | .nlgroup = RTNLGRP_IPV6_RULE, | |
235 | .policy = fib6_rule_policy, | |
236 | .rules_list = &fib6_rules, | |
237 | .owner = THIS_MODULE, | |
238 | }; | |
239 | ||
240 | void __init fib6_rules_init(void) | |
241 | { | |
242 | list_add_tail(&local_rule.common.list, &fib6_rules); | |
243 | list_add_tail(&main_rule.common.list, &fib6_rules); | |
244 | ||
245 | fib_rules_register(&fib6_rules_ops); | |
246 | } | |
247 | ||
248 | void fib6_rules_cleanup(void) | |
249 | { | |
250 | fib_rules_unregister(&fib6_rules_ops); | |
251 | } |