2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * $KAME: in6_rmx.c,v 1.11 2001/07/26 06:53:16 jinmei Exp $
33 * Copyright 1994, 1995 Massachusetts Institute of Technology
35 * Permission to use, copy, modify, and distribute this software and
36 * its documentation for any purpose and without fee is hereby
37 * granted, provided that both the above copyright notice and this
38 * permission notice appear in all copies, that both the above
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40 * supporting documentation, and that the name of M.I.T. not be used
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42 * software without specific, written prior permission. M.I.T. makes
43 * no representations about the suitability of this software for any
44 * purpose. It is provided "as is" without express or implied
47 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
48 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
49 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
50 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
51 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
52 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
53 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
54 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
55 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
56 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
57 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62 #include <sys/cdefs.h>
63 __FBSDID("$FreeBSD$");
65 #include <sys/param.h>
66 #include <sys/systm.h>
67 #include <sys/kernel.h>
69 #include <sys/queue.h>
70 #include <sys/socket.h>
71 #include <sys/socketvar.h>
73 #include <sys/rwlock.h>
74 #include <sys/syslog.h>
75 #include <sys/callout.h>
78 #include <net/if_var.h>
79 #include <net/route.h>
81 #include <netinet/in.h>
82 #include <netinet/ip_var.h>
83 #include <netinet/in_var.h>
85 #include <netinet/ip6.h>
86 #include <netinet6/ip6_var.h>
88 #include <netinet/icmp6.h>
89 #include <netinet6/nd6.h>
91 #include <netinet/tcp.h>
92 #include <netinet/tcp_seq.h>
93 #include <netinet/tcp_timer.h>
94 #include <netinet/tcp_var.h>
96 extern int in6_inithead(void **head, int off);
98 extern int in6_detachhead(void **head, int off);
102 * Do what we need to do when inserting a route.
104 static struct radix_node *
105 in6_addroute(void *v_arg, void *n_arg, struct radix_node_head *head,
106 struct radix_node *treenodes)
108 struct rtentry *rt = (struct rtentry *)treenodes;
109 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)rt_key(rt);
110 struct radix_node *ret;
112 RADIX_NODE_HEAD_WLOCK_ASSERT(head);
113 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
114 rt->rt_flags |= RTF_MULTICAST;
117 * A little bit of help for both IPv6 output and input:
118 * For local addresses, we make sure that RTF_LOCAL is set,
119 * with the thought that this might one day be used to speed up
122 * We also mark routes to multicast addresses as such, because
123 * it's easy to do and might be useful (but this is much more
124 * dubious since it's so easy to inspect the address). (This
128 * should elaborate the code.
130 if (rt->rt_flags & RTF_HOST) {
131 if (IN6_ARE_ADDR_EQUAL(&satosin6(rt->rt_ifa->ifa_addr)
134 rt->rt_flags |= RTF_LOCAL;
138 if (rt->rt_ifp != NULL) {
142 * inherit interface MTU if not set or
143 * check if MTU is too large.
145 if (rt->rt_mtu == 0) {
146 rt->rt_mtu = IN6_LINKMTU(rt->rt_ifp);
147 } else if (rt->rt_mtu > IN6_LINKMTU(rt->rt_ifp))
148 rt->rt_mtu = IN6_LINKMTU(rt->rt_ifp);
151 ret = rn_addroute(v_arg, n_arg, head, treenodes);
155 * We are trying to add a net route, but can't.
156 * The following case should be allowed, so we'll make a
157 * special check for this:
158 * Two IPv6 addresses with the same prefix is assigned
159 * to a single interrface.
160 * # ifconfig if0 inet6 3ffe:0501::1 prefix 64 alias (*1)
161 * # ifconfig if0 inet6 3ffe:0501::2 prefix 64 alias (*2)
162 * In this case, (*1) and (*2) want to add the same
163 * net route entry, 3ffe:0501:: -> if0.
164 * This case should not raise an error.
166 rt2 = in6_rtalloc1((struct sockaddr *)sin6, 0, RTF_RNH_LOCKED,
169 if (((rt2->rt_flags & (RTF_HOST|RTF_GATEWAY)) == 0)
171 && rt2->rt_gateway->sa_family == AF_LINK
172 && rt2->rt_ifp == rt->rt_ifp) {
185 struct radix_node_head *rnh;
188 static VNET_DEFINE(struct callout, rtq_mtutimer);
189 #define V_rtq_mtutimer VNET(rtq_mtutimer)
192 in6_mtuexpire(struct rtentry *rt, void *rock)
194 struct mtuex_arg *ap = rock;
196 if (rt->rt_expire && !(rt->rt_flags & RTF_PROBEMTU)) {
197 if (rt->rt_expire <= time_uptime) {
198 rt->rt_flags |= RTF_PROBEMTU;
200 ap->nextstop = lmin(ap->nextstop, rt->rt_expire);
207 #define MTUTIMO_DEFAULT (60*1)
210 in6_mtutimo_setwa(struct radix_node_head *rnh, uint32_t fibum, int af, void *_arg)
212 struct mtuex_arg *arg;
214 arg = (struct mtuex_arg *)_arg;
220 in6_mtutimo(void *rock)
222 CURVNET_SET_QUIET((struct vnet *) rock);
224 struct mtuex_arg arg;
226 rt_foreach_fib(AF_INET6, in6_mtutimo_setwa, in6_mtuexpire, &arg);
228 atv.tv_sec = MTUTIMO_DEFAULT;
230 callout_reset(&V_rtq_mtutimer, tvtohz(&atv), in6_mtutimo, rock);
235 * Initialize our routing tree.
237 static VNET_DEFINE(int, _in6_rt_was_here);
238 #define V__in6_rt_was_here VNET(_in6_rt_was_here)
241 in6_inithead(void **head, int off)
243 struct radix_node_head *rnh;
245 if (!rn_inithead(head, offsetof(struct sockaddr_in6, sin6_addr) << 3))
249 RADIX_NODE_HEAD_LOCK_INIT(rnh);
251 rnh->rnh_addaddr = in6_addroute;
253 if (V__in6_rt_was_here == 0) {
254 callout_init(&V_rtq_mtutimer, 1);
255 in6_mtutimo(curvnet); /* kick off timeout first time */
256 V__in6_rt_was_here = 1;
264 in6_detachhead(void **head, int off)
267 callout_drain(&V_rtq_mtutimer);
273 * Extended API for IPv6 FIB support.
276 in6_rtredirect(struct sockaddr *dst, struct sockaddr *gw, struct sockaddr *nm,
277 int flags, struct sockaddr *src, u_int fibnum)
280 rtredirect_fib(dst, gw, nm, flags, src, fibnum);
284 in6_rtrequest(int req, struct sockaddr *dst, struct sockaddr *gw,
285 struct sockaddr *mask, int flags, struct rtentry **ret_nrt, u_int fibnum)
288 return (rtrequest_fib(req, dst, gw, mask, flags, ret_nrt, fibnum));
292 in6_rtalloc(struct route_in6 *ro, u_int fibnum)
295 rtalloc_ign_fib((struct route *)ro, 0ul, fibnum);
299 in6_rtalloc_ign(struct route_in6 *ro, u_long ignflags, u_int fibnum)
302 rtalloc_ign_fib((struct route *)ro, ignflags, fibnum);
306 in6_rtalloc1(struct sockaddr *dst, int report, u_long ignflags, u_int fibnum)
309 return (rtalloc1_fib(dst, report, ignflags, fibnum));