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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> | |
20 | #include <net/ip6_route.h> | |
21 | #include <net/netlink.h> | |
22 | ||
23 | struct fib6_rule | |
24 | { | |
25 | struct fib_rule common; | |
26 | struct rt6key src; | |
27 | struct rt6key dst; | |
28 | u8 tclass; | |
29 | }; | |
30 | ||
31 | static struct fib_rules_ops fib6_rules_ops; | |
32 | ||
33 | static struct fib6_rule main_rule = { | |
34 | .common = { | |
35 | .refcnt = ATOMIC_INIT(2), | |
36 | .pref = 0x7FFE, | |
37 | .action = FR_ACT_TO_TBL, | |
38 | .table = RT6_TABLE_MAIN, | |
39 | }, | |
40 | }; | |
41 | ||
42 | static struct fib6_rule local_rule = { | |
43 | .common = { | |
44 | .refcnt = ATOMIC_INIT(2), | |
45 | .pref = 0, | |
46 | .action = FR_ACT_TO_TBL, | |
47 | .table = RT6_TABLE_LOCAL, | |
48 | .flags = FIB_RULE_PERMANENT, | |
49 | }, | |
50 | }; | |
51 | ||
52 | static LIST_HEAD(fib6_rules); | |
53 | ||
54 | struct dst_entry *fib6_rule_lookup(struct flowi *fl, int flags, | |
55 | pol_lookup_t lookup) | |
56 | { | |
57 | struct fib_lookup_arg arg = { | |
58 | .lookup_ptr = lookup, | |
59 | }; | |
60 | ||
61 | fib_rules_lookup(&fib6_rules_ops, fl, flags, &arg); | |
62 | if (arg.rule) | |
63 | fib_rule_put(arg.rule); | |
64 | ||
b1429553 | 65 | if (arg.result) |
40aa7b90 | 66 | return arg.result; |
b1429553 VN |
67 | |
68 | dst_hold(&ip6_null_entry.u.dst); | |
69 | return &ip6_null_entry.u.dst; | |
101367c2 TG |
70 | } |
71 | ||
8ce11e6a AB |
72 | static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp, |
73 | int flags, struct fib_lookup_arg *arg) | |
101367c2 TG |
74 | { |
75 | struct rt6_info *rt = NULL; | |
76 | struct fib6_table *table; | |
77 | pol_lookup_t lookup = arg->lookup_ptr; | |
78 | ||
79 | switch (rule->action) { | |
80 | case FR_ACT_TO_TBL: | |
81 | break; | |
82 | case FR_ACT_UNREACHABLE: | |
83 | rt = &ip6_null_entry; | |
84 | goto discard_pkt; | |
85 | default: | |
86 | case FR_ACT_BLACKHOLE: | |
87 | rt = &ip6_blk_hole_entry; | |
88 | goto discard_pkt; | |
89 | case FR_ACT_PROHIBIT: | |
90 | rt = &ip6_prohibit_entry; | |
91 | goto discard_pkt; | |
92 | } | |
93 | ||
94 | table = fib6_get_table(rule->table); | |
95 | if (table) | |
96 | rt = lookup(table, flp, flags); | |
97 | ||
98 | if (rt != &ip6_null_entry) | |
99 | goto out; | |
101367c2 | 100 | dst_release(&rt->u.dst); |
3226f688 PM |
101 | rt = NULL; |
102 | goto out; | |
103 | ||
101367c2 TG |
104 | discard_pkt: |
105 | dst_hold(&rt->u.dst); | |
106 | out: | |
107 | arg->result = rt; | |
108 | return rt == NULL ? -EAGAIN : 0; | |
109 | } | |
110 | ||
111 | ||
112 | static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) | |
113 | { | |
114 | struct fib6_rule *r = (struct fib6_rule *) rule; | |
115 | ||
adaa70bb TG |
116 | if (r->dst.plen && |
117 | !ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen)) | |
101367c2 TG |
118 | return 0; |
119 | ||
adaa70bb TG |
120 | if (r->src.plen) { |
121 | if (!(flags & RT6_LOOKUP_F_HAS_SADDR) || | |
122 | !ipv6_prefix_equal(&fl->fl6_src, &r->src.addr, r->src.plen)) | |
123 | return 0; | |
124 | } | |
101367c2 | 125 | |
2cc67cc7 YH |
126 | if (r->tclass && r->tclass != ((ntohl(fl->fl6_flowlabel) >> 20) & 0xff)) |
127 | return 0; | |
128 | ||
101367c2 TG |
129 | return 1; |
130 | } | |
131 | ||
2613aad5 | 132 | static struct nla_policy fib6_rule_policy[FRA_MAX+1] __read_mostly = { |
1f6c9557 | 133 | FRA_GENERIC_POLICY, |
5176f91e TG |
134 | [FRA_SRC] = { .len = sizeof(struct in6_addr) }, |
135 | [FRA_DST] = { .len = sizeof(struct in6_addr) }, | |
101367c2 TG |
136 | }; |
137 | ||
138 | static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb, | |
139 | struct nlmsghdr *nlh, struct fib_rule_hdr *frh, | |
140 | struct nlattr **tb) | |
141 | { | |
142 | int err = -EINVAL; | |
143 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; | |
144 | ||
f465e489 | 145 | if (frh->src_len > 128 || frh->dst_len > 128) |
101367c2 TG |
146 | goto errout; |
147 | ||
148 | if (rule->action == FR_ACT_TO_TBL) { | |
149 | if (rule->table == RT6_TABLE_UNSPEC) | |
150 | goto errout; | |
151 | ||
152 | if (fib6_new_table(rule->table) == NULL) { | |
153 | err = -ENOBUFS; | |
154 | goto errout; | |
155 | } | |
156 | } | |
157 | ||
158 | if (tb[FRA_SRC]) | |
159 | nla_memcpy(&rule6->src.addr, tb[FRA_SRC], | |
160 | sizeof(struct in6_addr)); | |
161 | ||
162 | if (tb[FRA_DST]) | |
163 | nla_memcpy(&rule6->dst.addr, tb[FRA_DST], | |
164 | sizeof(struct in6_addr)); | |
165 | ||
166 | rule6->src.plen = frh->src_len; | |
167 | rule6->dst.plen = frh->dst_len; | |
168 | rule6->tclass = frh->tos; | |
169 | ||
170 | err = 0; | |
171 | errout: | |
172 | return err; | |
173 | } | |
174 | ||
175 | static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, | |
176 | struct nlattr **tb) | |
177 | { | |
178 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; | |
179 | ||
180 | if (frh->src_len && (rule6->src.plen != frh->src_len)) | |
181 | return 0; | |
182 | ||
183 | if (frh->dst_len && (rule6->dst.plen != frh->dst_len)) | |
184 | return 0; | |
185 | ||
186 | if (frh->tos && (rule6->tclass != frh->tos)) | |
187 | return 0; | |
188 | ||
189 | if (tb[FRA_SRC] && | |
190 | nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr))) | |
191 | return 0; | |
192 | ||
193 | if (tb[FRA_DST] && | |
194 | nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr))) | |
195 | return 0; | |
196 | ||
197 | return 1; | |
198 | } | |
199 | ||
200 | static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb, | |
201 | struct nlmsghdr *nlh, struct fib_rule_hdr *frh) | |
202 | { | |
203 | struct fib6_rule *rule6 = (struct fib6_rule *) rule; | |
204 | ||
205 | frh->family = AF_INET6; | |
206 | frh->dst_len = rule6->dst.plen; | |
207 | frh->src_len = rule6->src.plen; | |
208 | frh->tos = rule6->tclass; | |
209 | ||
210 | if (rule6->dst.plen) | |
211 | NLA_PUT(skb, FRA_DST, sizeof(struct in6_addr), | |
212 | &rule6->dst.addr); | |
213 | ||
214 | if (rule6->src.plen) | |
215 | NLA_PUT(skb, FRA_SRC, sizeof(struct in6_addr), | |
216 | &rule6->src.addr); | |
217 | ||
218 | return 0; | |
219 | ||
220 | nla_put_failure: | |
221 | return -ENOBUFS; | |
222 | } | |
223 | ||
224 | int fib6_rules_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
225 | { | |
226 | return fib_rules_dump(skb, cb, AF_INET6); | |
227 | } | |
228 | ||
229 | static u32 fib6_rule_default_pref(void) | |
230 | { | |
231 | return 0x3FFF; | |
232 | } | |
233 | ||
339bf98f TG |
234 | static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule) |
235 | { | |
236 | return nla_total_size(16) /* dst */ | |
237 | + nla_total_size(16); /* src */ | |
238 | } | |
239 | ||
101367c2 TG |
240 | static struct fib_rules_ops fib6_rules_ops = { |
241 | .family = AF_INET6, | |
242 | .rule_size = sizeof(struct fib6_rule), | |
243 | .action = fib6_rule_action, | |
244 | .match = fib6_rule_match, | |
245 | .configure = fib6_rule_configure, | |
246 | .compare = fib6_rule_compare, | |
247 | .fill = fib6_rule_fill, | |
248 | .default_pref = fib6_rule_default_pref, | |
339bf98f | 249 | .nlmsg_payload = fib6_rule_nlmsg_payload, |
101367c2 TG |
250 | .nlgroup = RTNLGRP_IPV6_RULE, |
251 | .policy = fib6_rule_policy, | |
252 | .rules_list = &fib6_rules, | |
253 | .owner = THIS_MODULE, | |
254 | }; | |
255 | ||
256 | void __init fib6_rules_init(void) | |
257 | { | |
258 | list_add_tail(&local_rule.common.list, &fib6_rules); | |
259 | list_add_tail(&main_rule.common.list, &fib6_rules); | |
260 | ||
261 | fib_rules_register(&fib6_rules_ops); | |
262 | } | |
263 | ||
264 | void fib6_rules_cleanup(void) | |
265 | { | |
266 | fib_rules_unregister(&fib6_rules_ops); | |
267 | } |