2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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31 * $KAME: in6_rmx.c,v 1.11 2001/07/26 06:53:16 jinmei Exp $
35 * Copyright 1994, 1995 Massachusetts Institute of Technology
37 * Permission to use, copy, modify, and distribute this software and
38 * its documentation for any purpose and without fee is hereby
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50 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
51 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
52 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
53 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
54 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
55 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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57 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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59 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
64 #include <sys/cdefs.h>
65 __FBSDID("$FreeBSD$");
67 #include <sys/param.h>
68 #include <sys/systm.h>
69 #include <sys/kernel.h>
71 #include <sys/queue.h>
72 #include <sys/socket.h>
73 #include <sys/socketvar.h>
75 #include <sys/rwlock.h>
76 #include <sys/syslog.h>
77 #include <sys/callout.h>
80 #include <net/if_var.h>
81 #include <net/route.h>
82 #include <net/route_var.h>
84 #include <netinet/in.h>
85 #include <netinet/ip_var.h>
86 #include <netinet/in_var.h>
88 #include <netinet/ip6.h>
89 #include <netinet6/ip6_var.h>
91 #include <netinet/icmp6.h>
92 #include <netinet6/nd6.h>
94 #include <netinet/tcp.h>
95 #include <netinet/tcp_seq.h>
96 #include <netinet/tcp_timer.h>
97 #include <netinet/tcp_var.h>
99 extern int in6_inithead(void **head, int off);
101 extern int in6_detachhead(void **head, int off);
105 * Do what we need to do when inserting a route.
107 static struct radix_node *
108 in6_addroute(void *v_arg, void *n_arg, struct radix_head *head,
109 struct radix_node *treenodes)
111 struct rtentry *rt = (struct rtentry *)treenodes;
112 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)rt_key(rt);
114 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
115 rt->rt_flags |= RTF_MULTICAST;
118 * A little bit of help for both IPv6 output and input:
119 * For local addresses, we make sure that RTF_LOCAL is set,
120 * with the thought that this might one day be used to speed up
123 * We also mark routes to multicast addresses as such, because
124 * it's easy to do and might be useful (but this is much more
125 * dubious since it's so easy to inspect the address). (This
129 * should elaborate the code.
131 if (rt->rt_flags & RTF_HOST) {
132 if (IN6_ARE_ADDR_EQUAL(&satosin6(rt->rt_ifa->ifa_addr)
135 rt->rt_flags |= RTF_LOCAL;
139 if (rt->rt_ifp != NULL) {
143 * inherit interface MTU if not set or
144 * check if MTU is too large.
146 if (rt->rt_mtu == 0) {
147 rt->rt_mtu = IN6_LINKMTU(rt->rt_ifp);
148 } else if (rt->rt_mtu > IN6_LINKMTU(rt->rt_ifp))
149 rt->rt_mtu = IN6_LINKMTU(rt->rt_ifp);
152 return (rn_addroute(v_arg, n_arg, head, treenodes));
159 struct rib_head *rnh;
162 VNET_DEFINE_STATIC(struct callout, rtq_mtutimer);
163 #define V_rtq_mtutimer VNET(rtq_mtutimer)
166 in6_mtuexpire(struct rtentry *rt, void *rock)
168 struct mtuex_arg *ap = rock;
170 if (rt->rt_expire && !(rt->rt_flags & RTF_PROBEMTU)) {
171 if (rt->rt_expire <= time_uptime) {
172 rt->rt_flags |= RTF_PROBEMTU;
174 ap->nextstop = lmin(ap->nextstop, rt->rt_expire);
181 #define MTUTIMO_DEFAULT (60*1)
184 in6_mtutimo_setwa(struct rib_head *rnh, uint32_t fibum, int af,
187 struct mtuex_arg *arg;
189 arg = (struct mtuex_arg *)_arg;
195 in6_mtutimo(void *rock)
197 CURVNET_SET_QUIET((struct vnet *) rock);
199 struct mtuex_arg arg;
201 rt_foreach_fib_walk(AF_INET6, in6_mtutimo_setwa, in6_mtuexpire, &arg);
203 atv.tv_sec = MTUTIMO_DEFAULT;
205 callout_reset(&V_rtq_mtutimer, tvtohz(&atv), in6_mtutimo, rock);
210 * Initialize our routing tree.
212 VNET_DEFINE_STATIC(int, _in6_rt_was_here);
213 #define V__in6_rt_was_here VNET(_in6_rt_was_here)
216 in6_inithead(void **head, int off)
220 rh = rt_table_init(offsetof(struct sockaddr_in6, sin6_addr) << 3);
224 rh->rnh_addaddr = in6_addroute;
227 if (V__in6_rt_was_here == 0) {
228 callout_init(&V_rtq_mtutimer, 1);
229 in6_mtutimo(curvnet); /* kick off timeout first time */
230 V__in6_rt_was_here = 1;
238 in6_detachhead(void **head, int off)
241 callout_drain(&V_rtq_mtutimer);
242 rt_table_destroy((struct rib_head *)(*head));
249 * Extended API for IPv6 FIB support.
252 in6_rtredirect(struct sockaddr *dst, struct sockaddr *gw, struct sockaddr *nm,
253 int flags, struct sockaddr *src, u_int fibnum)
256 rtredirect_fib(dst, gw, nm, flags, src, fibnum);
260 in6_rtrequest(int req, struct sockaddr *dst, struct sockaddr *gw,
261 struct sockaddr *mask, int flags, struct rtentry **ret_nrt, u_int fibnum)
264 return (rtrequest_fib(req, dst, gw, mask, flags, ret_nrt, fibnum));
268 in6_rtalloc(struct route_in6 *ro, u_int fibnum)
271 rtalloc_ign_fib((struct route *)ro, 0ul, fibnum);
275 in6_rtalloc_ign(struct route_in6 *ro, u_long ignflags, u_int fibnum)
278 rtalloc_ign_fib((struct route *)ro, ignflags, fibnum);
282 in6_rtalloc1(struct sockaddr *dst, int report, u_long ignflags, u_int fibnum)
285 return (rtalloc1_fib(dst, report, ignflags, fibnum));