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Linux/net/ipv6/fib6_rules.c

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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 #include <linux/export.h>
 18 
 19 #include <net/fib_rules.h>
 20 #include <net/ipv6.h>
 21 #include <net/addrconf.h>
 22 #include <net/ip6_route.h>
 23 #include <net/netlink.h>
 24 
 25 struct fib6_rule
 26 {
 27         struct fib_rule         common;
 28         struct rt6key           src;
 29         struct rt6key           dst;
 30         u8                      tclass;
 31 };
 32 
 33 struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
 34                                    int flags, pol_lookup_t lookup)
 35 {
 36         struct fib_lookup_arg arg = {
 37                 .lookup_ptr = lookup,
 38                 .flags = FIB_LOOKUP_NOREF,
 39         };
 40 
 41         fib_rules_lookup(net->ipv6.fib6_rules_ops,
 42                          flowi6_to_flowi(fl6), flags, &arg);
 43 
 44         if (arg.result)
 45                 return arg.result;
 46 
 47         dst_hold(&net->ipv6.ip6_null_entry->dst);
 48         return &net->ipv6.ip6_null_entry->dst;
 49 }
 50 
 51 static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
 52                             int flags, struct fib_lookup_arg *arg)
 53 {
 54         struct flowi6 *flp6 = &flp->u.ip6;
 55         struct rt6_info *rt = NULL;
 56         struct fib6_table *table;
 57         struct net *net = rule->fr_net;
 58         pol_lookup_t lookup = arg->lookup_ptr;
 59 
 60         switch (rule->action) {
 61         case FR_ACT_TO_TBL:
 62                 break;
 63         case FR_ACT_UNREACHABLE:
 64                 rt = net->ipv6.ip6_null_entry;
 65                 goto discard_pkt;
 66         default:
 67         case FR_ACT_BLACKHOLE:
 68                 rt = net->ipv6.ip6_blk_hole_entry;
 69                 goto discard_pkt;
 70         case FR_ACT_PROHIBIT:
 71                 rt = net->ipv6.ip6_prohibit_entry;
 72                 goto discard_pkt;
 73         }
 74 
 75         table = fib6_get_table(net, rule->table);
 76         if (table)
 77                 rt = lookup(net, table, flp6, flags);
 78 
 79         if (rt != net->ipv6.ip6_null_entry) {
 80                 struct fib6_rule *r = (struct fib6_rule *)rule;
 81 
 82                 /*
 83                  * If we need to find a source address for this traffic,
 84                  * we check the result if it meets requirement of the rule.
 85                  */
 86                 if ((rule->flags & FIB_RULE_FIND_SADDR) &&
 87                     r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) {
 88                         struct in6_addr saddr;
 89 
 90                         if (ipv6_dev_get_saddr(net,
 91                                                ip6_dst_idev(&rt->dst)->dev,
 92                                                &flp6->daddr,
 93                                                rt6_flags2srcprefs(flags),
 94                                                &saddr))
 95                                 goto again;
 96                         if (!ipv6_prefix_equal(&saddr, &r->src.addr,
 97                                                r->src.plen))
 98                                 goto again;
 99                         flp6->saddr = saddr;
100                 }
101                 goto out;
102         }
103 again:
104         dst_release(&rt->dst);
105         rt = NULL;
106         goto out;
107 
108 discard_pkt:
109         dst_hold(&rt->dst);
110 out:
111         arg->result = rt;
112         return rt == NULL ? -EAGAIN : 0;
113 }
114 
115 
116 static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
117 {
118         struct fib6_rule *r = (struct fib6_rule *) rule;
119         struct flowi6 *fl6 = &fl->u.ip6;
120 
121         if (r->dst.plen &&
122             !ipv6_prefix_equal(&fl6->daddr, &r->dst.addr, r->dst.plen))
123                 return 0;
124 
125         /*
126          * If FIB_RULE_FIND_SADDR is set and we do not have a
127          * source address for the traffic, we defer check for
128          * source address.
129          */
130         if (r->src.plen) {
131                 if (flags & RT6_LOOKUP_F_HAS_SADDR) {
132                         if (!ipv6_prefix_equal(&fl6->saddr, &r->src.addr,
133                                                r->src.plen))
134                                 return 0;
135                 } else if (!(r->common.flags & FIB_RULE_FIND_SADDR))
136                         return 0;
137         }
138 
139         if (r->tclass && r->tclass != ((ntohl(fl6->flowlabel) >> 20) & 0xff))
140                 return 0;
141 
142         return 1;
143 }
144 
145 static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = {
146         FRA_GENERIC_POLICY,
147 };
148 
149 static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
150                                struct fib_rule_hdr *frh,
151                                struct nlattr **tb)
152 {
153         int err = -EINVAL;
154         struct net *net = sock_net(skb->sk);
155         struct fib6_rule *rule6 = (struct fib6_rule *) rule;
156 
157         if (rule->action == FR_ACT_TO_TBL) {
158                 if (rule->table == RT6_TABLE_UNSPEC)
159                         goto errout;
160 
161                 if (fib6_new_table(net, rule->table) == NULL) {
162                         err = -ENOBUFS;
163                         goto errout;
164                 }
165         }
166 
167         if (frh->src_len)
168                 nla_memcpy(&rule6->src.addr, tb[FRA_SRC],
169                            sizeof(struct in6_addr));
170 
171         if (frh->dst_len)
172                 nla_memcpy(&rule6->dst.addr, tb[FRA_DST],
173                            sizeof(struct in6_addr));
174 
175         rule6->src.plen = frh->src_len;
176         rule6->dst.plen = frh->dst_len;
177         rule6->tclass = frh->tos;
178 
179         err = 0;
180 errout:
181         return err;
182 }
183 
184 static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
185                              struct nlattr **tb)
186 {
187         struct fib6_rule *rule6 = (struct fib6_rule *) rule;
188 
189         if (frh->src_len && (rule6->src.plen != frh->src_len))
190                 return 0;
191 
192         if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
193                 return 0;
194 
195         if (frh->tos && (rule6->tclass != frh->tos))
196                 return 0;
197 
198         if (frh->src_len &&
199             nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
200                 return 0;
201 
202         if (frh->dst_len &&
203             nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
204                 return 0;
205 
206         return 1;
207 }
208 
209 static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
210                           struct fib_rule_hdr *frh)
211 {
212         struct fib6_rule *rule6 = (struct fib6_rule *) rule;
213 
214         frh->dst_len = rule6->dst.plen;
215         frh->src_len = rule6->src.plen;
216         frh->tos = rule6->tclass;
217 
218         if (rule6->dst.plen)
219                 NLA_PUT(skb, FRA_DST, sizeof(struct in6_addr),
220                         &rule6->dst.addr);
221 
222         if (rule6->src.plen)
223                 NLA_PUT(skb, FRA_SRC, sizeof(struct in6_addr),
224                         &rule6->src.addr);
225 
226         return 0;
227 
228 nla_put_failure:
229         return -ENOBUFS;
230 }
231 
232 static u32 fib6_rule_default_pref(struct fib_rules_ops *ops)
233 {
234         return 0x3FFF;
235 }
236 
237 static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
238 {
239         return nla_total_size(16) /* dst */
240                + nla_total_size(16); /* src */
241 }
242 
243 static const struct fib_rules_ops __net_initdata fib6_rules_ops_template = {
244         .family                 = AF_INET6,
245         .rule_size              = sizeof(struct fib6_rule),
246         .addr_size              = sizeof(struct in6_addr),
247         .action                 = fib6_rule_action,
248         .match                  = fib6_rule_match,
249         .configure              = fib6_rule_configure,
250         .compare                = fib6_rule_compare,
251         .fill                   = fib6_rule_fill,
252         .default_pref           = fib6_rule_default_pref,
253         .nlmsg_payload          = fib6_rule_nlmsg_payload,
254         .nlgroup                = RTNLGRP_IPV6_RULE,
255         .policy                 = fib6_rule_policy,
256         .owner                  = THIS_MODULE,
257         .fro_net                = &init_net,
258 };
259 
260 static int __net_init fib6_rules_net_init(struct net *net)
261 {
262         struct fib_rules_ops *ops;
263         int err = -ENOMEM;
264 
265         ops = fib_rules_register(&fib6_rules_ops_template, net);
266         if (IS_ERR(ops))
267                 return PTR_ERR(ops);
268         net->ipv6.fib6_rules_ops = ops;
269 
270 
271         err = fib_default_rule_add(net->ipv6.fib6_rules_ops, 0,
272                                    RT6_TABLE_LOCAL, 0);
273         if (err)
274                 goto out_fib6_rules_ops;
275 
276         err = fib_default_rule_add(net->ipv6.fib6_rules_ops,
277                                    0x7FFE, RT6_TABLE_MAIN, 0);
278         if (err)
279                 goto out_fib6_rules_ops;
280 
281 out:
282         return err;
283 
284 out_fib6_rules_ops:
285         fib_rules_unregister(ops);
286         goto out;
287 }
288 
289 static void __net_exit fib6_rules_net_exit(struct net *net)
290 {
291         fib_rules_unregister(net->ipv6.fib6_rules_ops);
292 }
293 
294 static struct pernet_operations fib6_rules_net_ops = {
295         .init = fib6_rules_net_init,
296         .exit = fib6_rules_net_exit,
297 };
298 
299 int __init fib6_rules_init(void)
300 {
301         return register_pernet_subsys(&fib6_rules_net_ops);
302 }
303 
304 
305 void fib6_rules_cleanup(void)
306 {
307         unregister_pernet_subsys(&fib6_rules_net_ops);
308 }
309 

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