2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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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
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48 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
49 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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53 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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55 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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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/sysctl.h>
70 #include <sys/queue.h>
71 #include <sys/socket.h>
72 #include <sys/socketvar.h>
74 #include <sys/rwlock.h>
75 #include <sys/syslog.h>
76 #include <sys/callout.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_rmx.rmx_mtu && rt->rt_ifp)
139 rt->rt_rmx.rmx_mtu = IN6_LINKMTU(rt->rt_ifp);
141 ret = rn_addroute(v_arg, n_arg, head, treenodes);
145 * We are trying to add a net route, but can't.
146 * The following case should be allowed, so we'll make a
147 * special check for this:
148 * Two IPv6 addresses with the same prefix is assigned
149 * to a single interrface.
150 * # ifconfig if0 inet6 3ffe:0501::1 prefix 64 alias (*1)
151 * # ifconfig if0 inet6 3ffe:0501::2 prefix 64 alias (*2)
152 * In this case, (*1) and (*2) want to add the same
153 * net route entry, 3ffe:0501:: -> if0.
154 * This case should not raise an error.
156 rt2 = in6_rtalloc1((struct sockaddr *)sin6, 0, RTF_RNH_LOCKED,
159 if (((rt2->rt_flags & (RTF_HOST|RTF_GATEWAY)) == 0)
161 && rt2->rt_gateway->sa_family == AF_LINK
162 && rt2->rt_ifp == rt->rt_ifp) {
171 SYSCTL_DECL(_net_inet6_ip6);
173 static VNET_DEFINE(int, rtq_toomany6) = 128;
174 /* 128 cached routes is ``too many'' */
175 #define V_rtq_toomany6 VNET(rtq_toomany6)
176 SYSCTL_VNET_INT(_net_inet6_ip6, IPV6CTL_RTMAXCACHE, rtmaxcache, CTLFLAG_RW,
177 &VNET_NAME(rtq_toomany6) , 0, "");
180 struct radix_node_head *rnh;
193 struct radix_node_head *rnh;
196 static VNET_DEFINE(struct callout, rtq_mtutimer);
197 #define V_rtq_mtutimer VNET(rtq_mtutimer)
200 in6_mtuexpire(struct radix_node *rn, void *rock)
202 struct rtentry *rt = (struct rtentry *)rn;
203 struct mtuex_arg *ap = rock;
207 panic("rt == NULL in in6_mtuexpire");
209 if (rt->rt_rmx.rmx_expire && !(rt->rt_flags & RTF_PROBEMTU)) {
210 if (rt->rt_rmx.rmx_expire <= time_uptime) {
211 rt->rt_flags |= RTF_PROBEMTU;
213 ap->nextstop = lmin(ap->nextstop,
214 rt->rt_rmx.rmx_expire);
221 #define MTUTIMO_DEFAULT (60*1)
224 in6_mtutimo_one(struct radix_node_head *rnh)
226 struct mtuex_arg arg;
229 arg.nextstop = time_uptime + MTUTIMO_DEFAULT;
230 RADIX_NODE_HEAD_LOCK(rnh);
231 rnh->rnh_walktree(rnh, in6_mtuexpire, &arg);
232 RADIX_NODE_HEAD_UNLOCK(rnh);
236 in6_mtutimo(void *rock)
238 CURVNET_SET_QUIET((struct vnet *) rock);
239 struct radix_node_head *rnh;
243 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
244 rnh = rt_tables_get_rnh(fibnum, AF_INET6);
246 in6_mtutimo_one(rnh);
249 atv.tv_sec = MTUTIMO_DEFAULT;
251 callout_reset(&V_rtq_mtutimer, tvtohz(&atv), in6_mtutimo, rock);
256 * Initialize our routing tree.
257 * XXX MRT When off == 0, we are being called from vfs_export.c
258 * so just set up their table and leave. (we know what the correct
259 * value should be so just use that).. FIX AFTER RELENG_7 is MFC'd
260 * see also comments in in_inithead() vfs_export.c and domain.h
262 static VNET_DEFINE(int, _in6_rt_was_here);
263 #define V__in6_rt_was_here VNET(_in6_rt_was_here)
266 in6_inithead(void **head, int off)
268 struct radix_node_head *rnh;
270 if (!rn_inithead(head, offsetof(struct sockaddr_in6, sin6_addr) << 3))
271 return 0; /* See above */
273 if (off == 0) /* See above */
274 return 1; /* only do the rest for the real thing */
277 rnh->rnh_addaddr = in6_addroute;
279 if (V__in6_rt_was_here == 0) {
280 callout_init(&V_rtq_mtutimer, CALLOUT_MPSAFE);
281 in6_mtutimo(curvnet); /* kick off timeout first time */
282 V__in6_rt_was_here = 1;
290 in6_detachhead(void **head, int off)
293 callout_drain(&V_rtq_mtutimer);
299 * Extended API for IPv6 FIB support.
302 in6_rtredirect(struct sockaddr *dst, struct sockaddr *gw, struct sockaddr *nm,
303 int flags, struct sockaddr *src, u_int fibnum)
306 rtredirect_fib(dst, gw, nm, flags, src, fibnum);
310 in6_rtrequest(int req, struct sockaddr *dst, struct sockaddr *gw,
311 struct sockaddr *mask, int flags, struct rtentry **ret_nrt, u_int fibnum)
314 return (rtrequest_fib(req, dst, gw, mask, flags, ret_nrt, fibnum));
318 in6_rtalloc(struct route_in6 *ro, u_int fibnum)
321 rtalloc_ign_fib((struct route *)ro, 0ul, fibnum);
325 in6_rtalloc_ign(struct route_in6 *ro, u_long ignflags, u_int fibnum)
328 rtalloc_ign_fib((struct route *)ro, ignflags, fibnum);
332 in6_rtalloc1(struct sockaddr *dst, int report, u_long ignflags, u_int fibnum)
335 return (rtalloc1_fib(dst, report, ignflags, fibnum));