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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         struct fib_rule         common;
 27         struct rt6key           src;
 28         struct rt6key           dst;
 29         u8                      tclass;
 30 };
 31 
 32 struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
 33                                    int flags, pol_lookup_t lookup)
 34 {
 35         struct rt6_info *rt;
 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         rt = arg.result;
 45 
 46         if (!rt) {
 47                 dst_hold(&net->ipv6.ip6_null_entry->dst);
 48                 return &net->ipv6.ip6_null_entry->dst;
 49         }
 50 
 51         if (rt->rt6i_flags & RTF_REJECT &&
 52             rt->dst.error == -EAGAIN) {
 53                 ip6_rt_put(rt);
 54                 rt = net->ipv6.ip6_null_entry;
 55                 dst_hold(&rt->dst);
 56         }
 57 
 58         return &rt->dst;
 59 }
 60 
 61 static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
 62                             int flags, struct fib_lookup_arg *arg)
 63 {
 64         struct flowi6 *flp6 = &flp->u.ip6;
 65         struct rt6_info *rt = NULL;
 66         struct fib6_table *table;
 67         struct net *net = rule->fr_net;
 68         pol_lookup_t lookup = arg->lookup_ptr;
 69         int err = 0;
 70 
 71         switch (rule->action) {
 72         case FR_ACT_TO_TBL:
 73                 break;
 74         case FR_ACT_UNREACHABLE:
 75                 err = -ENETUNREACH;
 76                 rt = net->ipv6.ip6_null_entry;
 77                 goto discard_pkt;
 78         default:
 79         case FR_ACT_BLACKHOLE:
 80                 err = -EINVAL;
 81                 rt = net->ipv6.ip6_blk_hole_entry;
 82                 goto discard_pkt;
 83         case FR_ACT_PROHIBIT:
 84                 err = -EACCES;
 85                 rt = net->ipv6.ip6_prohibit_entry;
 86                 goto discard_pkt;
 87         }
 88 
 89         table = fib6_get_table(net, rule->table);
 90         if (!table) {
 91                 err = -EAGAIN;
 92                 goto out;
 93         }
 94 
 95         rt = lookup(net, table, flp6, flags);
 96         if (rt != net->ipv6.ip6_null_entry) {
 97                 struct fib6_rule *r = (struct fib6_rule *)rule;
 98 
 99                 /*
100                  * If we need to find a source address for this traffic,
101                  * we check the result if it meets requirement of the rule.
102                  */
103                 if ((rule->flags & FIB_RULE_FIND_SADDR) &&
104                     r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) {
105                         struct in6_addr saddr;
106 
107                         if (ipv6_dev_get_saddr(net,
108                                                ip6_dst_idev(&rt->dst)->dev,
109                                                &flp6->daddr,
110                                                rt6_flags2srcprefs(flags),
111                                                &saddr))
112                                 goto again;
113                         if (!ipv6_prefix_equal(&saddr, &r->src.addr,
114                                                r->src.plen))
115                                 goto again;
116                         flp6->saddr = saddr;
117                 }
118                 err = rt->dst.error;
119                 goto out;
120         }
121 again:
122         ip6_rt_put(rt);
123         err = -EAGAIN;
124         rt = NULL;
125         goto out;
126 
127 discard_pkt:
128         dst_hold(&rt->dst);
129 out:
130         arg->result = rt;
131         return err;
132 }
133 
134 static bool fib6_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg)
135 {
136         struct rt6_info *rt = (struct rt6_info *) arg->result;
137         struct net_device *dev = NULL;
138 
139         if (rt->rt6i_idev)
140                 dev = rt->rt6i_idev->dev;
141 
142         /* do not accept result if the route does
143          * not meet the required prefix length
144          */
145         if (rt->rt6i_dst.plen <= rule->suppress_prefixlen)
146                 goto suppress_route;
147 
148         /* do not accept result if the route uses a device
149          * belonging to a forbidden interface group
150          */
151         if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup)
152                 goto suppress_route;
153 
154         return false;
155 
156 suppress_route:
157         ip6_rt_put(rt);
158         return true;
159 }
160 
161 static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
162 {
163         struct fib6_rule *r = (struct fib6_rule *) rule;
164         struct flowi6 *fl6 = &fl->u.ip6;
165 
166         if (r->dst.plen &&
167             !ipv6_prefix_equal(&fl6->daddr, &r->dst.addr, r->dst.plen))
168                 return 0;
169 
170         /*
171          * If FIB_RULE_FIND_SADDR is set and we do not have a
172          * source address for the traffic, we defer check for
173          * source address.
174          */
175         if (r->src.plen) {
176                 if (flags & RT6_LOOKUP_F_HAS_SADDR) {
177                         if (!ipv6_prefix_equal(&fl6->saddr, &r->src.addr,
178                                                r->src.plen))
179                                 return 0;
180                 } else if (!(r->common.flags & FIB_RULE_FIND_SADDR))
181                         return 0;
182         }
183 
184         if (r->tclass && r->tclass != ip6_tclass(fl6->flowlabel))
185                 return 0;
186 
187         return 1;
188 }
189 
190 static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = {
191         FRA_GENERIC_POLICY,
192 };
193 
194 static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
195                                struct fib_rule_hdr *frh,
196                                struct nlattr **tb)
197 {
198         int err = -EINVAL;
199         struct net *net = sock_net(skb->sk);
200         struct fib6_rule *rule6 = (struct fib6_rule *) rule;
201 
202         if (rule->action == FR_ACT_TO_TBL) {
203                 if (rule->table == RT6_TABLE_UNSPEC)
204                         goto errout;
205 
206                 if (fib6_new_table(net, rule->table) == NULL) {
207                         err = -ENOBUFS;
208                         goto errout;
209                 }
210         }
211 
212         if (frh->src_len)
213                 rule6->src.addr = nla_get_in6_addr(tb[FRA_SRC]);
214 
215         if (frh->dst_len)
216                 rule6->dst.addr = nla_get_in6_addr(tb[FRA_DST]);
217 
218         rule6->src.plen = frh->src_len;
219         rule6->dst.plen = frh->dst_len;
220         rule6->tclass = frh->tos;
221 
222         err = 0;
223 errout:
224         return err;
225 }
226 
227 static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
228                              struct nlattr **tb)
229 {
230         struct fib6_rule *rule6 = (struct fib6_rule *) rule;
231 
232         if (frh->src_len && (rule6->src.plen != frh->src_len))
233                 return 0;
234 
235         if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
236                 return 0;
237 
238         if (frh->tos && (rule6->tclass != frh->tos))
239                 return 0;
240 
241         if (frh->src_len &&
242             nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
243                 return 0;
244 
245         if (frh->dst_len &&
246             nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
247                 return 0;
248 
249         return 1;
250 }
251 
252 static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
253                           struct fib_rule_hdr *frh)
254 {
255         struct fib6_rule *rule6 = (struct fib6_rule *) rule;
256 
257         frh->dst_len = rule6->dst.plen;
258         frh->src_len = rule6->src.plen;
259         frh->tos = rule6->tclass;
260 
261         if ((rule6->dst.plen &&
262              nla_put_in6_addr(skb, FRA_DST, &rule6->dst.addr)) ||
263             (rule6->src.plen &&
264              nla_put_in6_addr(skb, FRA_SRC, &rule6->src.addr)))
265                 goto nla_put_failure;
266         return 0;
267 
268 nla_put_failure:
269         return -ENOBUFS;
270 }
271 
272 static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
273 {
274         return nla_total_size(16) /* dst */
275                + nla_total_size(16); /* src */
276 }
277 
278 static const struct fib_rules_ops __net_initconst fib6_rules_ops_template = {
279         .family                 = AF_INET6,
280         .rule_size              = sizeof(struct fib6_rule),
281         .addr_size              = sizeof(struct in6_addr),
282         .action                 = fib6_rule_action,
283         .match                  = fib6_rule_match,
284         .suppress               = fib6_rule_suppress,
285         .configure              = fib6_rule_configure,
286         .compare                = fib6_rule_compare,
287         .fill                   = fib6_rule_fill,
288         .nlmsg_payload          = fib6_rule_nlmsg_payload,
289         .nlgroup                = RTNLGRP_IPV6_RULE,
290         .policy                 = fib6_rule_policy,
291         .owner                  = THIS_MODULE,
292         .fro_net                = &init_net,
293 };
294 
295 static int __net_init fib6_rules_net_init(struct net *net)
296 {
297         struct fib_rules_ops *ops;
298         int err = -ENOMEM;
299 
300         ops = fib_rules_register(&fib6_rules_ops_template, net);
301         if (IS_ERR(ops))
302                 return PTR_ERR(ops);
303 
304         err = fib_default_rule_add(ops, 0, RT6_TABLE_LOCAL, 0);
305         if (err)
306                 goto out_fib6_rules_ops;
307 
308         err = fib_default_rule_add(ops, 0x7FFE, RT6_TABLE_MAIN, 0);
309         if (err)
310                 goto out_fib6_rules_ops;
311 
312         net->ipv6.fib6_rules_ops = ops;
313 out:
314         return err;
315 
316 out_fib6_rules_ops:
317         fib_rules_unregister(ops);
318         goto out;
319 }
320 
321 static void __net_exit fib6_rules_net_exit(struct net *net)
322 {
323         rtnl_lock();
324         fib_rules_unregister(net->ipv6.fib6_rules_ops);
325         rtnl_unlock();
326 }
327 
328 static struct pernet_operations fib6_rules_net_ops = {
329         .init = fib6_rules_net_init,
330         .exit = fib6_rules_net_exit,
331 };
332 
333 int __init fib6_rules_init(void)
334 {
335         return register_pernet_subsys(&fib6_rules_net_ops);
336 }
337 
338 
339 void fib6_rules_cleanup(void)
340 {
341         unregister_pernet_subsys(&fib6_rules_net_ops);
342 }
343 

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