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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
24struct fib6_rule
25{
26 struct fib_rule common;
27 struct rt6key src;
28 struct rt6key dst;
29 u8 tclass;
30};
31
32struct 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
50static 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
82
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 }
101again:
102 dst_release(&rt->u.dst);
103 rt = NULL;
104 goto out;
105
106discard_pkt:
107 dst_hold(&rt->u.dst);
108out:
109 arg->result = rt;
110 return rt == NULL ? -EAGAIN : 0;
111}
112
113
114static 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
124
125
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
142static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = {
143 FRA_GENERIC_POLICY,
144};
145
146static 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;
177errout:
178 return err;
179}
180
181static 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
206static 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->dst_len = rule6->dst.plen;
212 frh->src_len = rule6->src.plen;
213 frh->tos = rule6->tclass;
214
215 if (rule6->dst.plen)
216 NLA_PUT(skb, FRA_DST, sizeof(struct in6_addr),
217 &rule6->dst.addr);
218
219 if (rule6->src.plen)
220 NLA_PUT(skb, FRA_SRC, sizeof(struct in6_addr),
221 &rule6->src.addr);
222
223 return 0;
224
225nla_put_failure:
226 return -ENOBUFS;
227}
228
229static u32 fib6_rule_default_pref(struct fib_rules_ops *ops)
230{
231 return 0x3FFF;
232}
233
234static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
235{
236 return nla_total_size(16)
237 + nla_total_size(16);
238}
239
240static const struct fib_rules_ops __net_initdata fib6_rules_ops_template = {
241 .family = AF_INET6,
242 .rule_size = sizeof(struct fib6_rule),
243 .addr_size = sizeof(struct in6_addr),
244 .action = fib6_rule_action,
245 .match = fib6_rule_match,
246 .configure = fib6_rule_configure,
247 .compare = fib6_rule_compare,
248 .fill = fib6_rule_fill,
249 .default_pref = fib6_rule_default_pref,
250 .nlmsg_payload = fib6_rule_nlmsg_payload,
251 .nlgroup = RTNLGRP_IPV6_RULE,
252 .policy = fib6_rule_policy,
253 .owner = THIS_MODULE,
254 .fro_net = &init_net,
255};
256
257static int __net_init fib6_rules_net_init(struct net *net)
258{
259 struct fib_rules_ops *ops;
260 int err = -ENOMEM;
261
262 ops = fib_rules_register(&fib6_rules_ops_template, net);
263 if (IS_ERR(ops))
264 return PTR_ERR(ops);
265 net->ipv6.fib6_rules_ops = ops;
266
267
268 err = fib_default_rule_add(net->ipv6.fib6_rules_ops, 0,
269 RT6_TABLE_LOCAL, 0);
270 if (err)
271 goto out_fib6_rules_ops;
272
273 err = fib_default_rule_add(net->ipv6.fib6_rules_ops,
274 0x7FFE, RT6_TABLE_MAIN, 0);
275 if (err)
276 goto out_fib6_rules_ops;
277
278out:
279 return err;
280
281out_fib6_rules_ops:
282 fib_rules_unregister(ops);
283 goto out;
284}
285
286static void __net_exit fib6_rules_net_exit(struct net *net)
287{
288 fib_rules_unregister(net->ipv6.fib6_rules_ops);
289}
290
291static struct pernet_operations fib6_rules_net_ops = {
292 .init = fib6_rules_net_init,
293 .exit = fib6_rules_net_exit,
294};
295
296int __init fib6_rules_init(void)
297{
298 return register_pernet_subsys(&fib6_rules_net_ops);
299}
300
301
302void fib6_rules_cleanup(void)
303{
304 unregister_pernet_subsys(&fib6_rules_net_ops);
305}
306
