in6_rmx.c revision 294706 
1/*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
16 *
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
27 * SUCH DAMAGE.
28 *
29 *	$KAME: in6_rmx.c,v 1.11 2001/07/26 06:53:16 jinmei Exp $
30 */
31
32/*-
33 * Copyright 1994, 1995 Massachusetts Institute of Technology
34 *
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
39 * copyright notice and this permission notice appear in all
40 * supporting documentation, and that the name of M.I.T. not be used
41 * in advertising or publicity pertaining to distribution of the
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
45 * warranty.
46 *
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
58 * SUCH DAMAGE.
59 *
60 */
61
62#include <sys/cdefs.h>
63__FBSDID("$FreeBSD: head/sys/netinet6/in6_rmx.c 294706 2016-01-25 06:33:15Z melifaro $");
64
65#include <sys/param.h>
66#include <sys/systm.h>
67#include <sys/kernel.h>
68#include <sys/lock.h>
69#include <sys/queue.h>
70#include <sys/socket.h>
71#include <sys/socketvar.h>
72#include <sys/mbuf.h>
73#include <sys/rwlock.h>
74#include <sys/syslog.h>
75#include <sys/callout.h>
76
77#include <net/if.h>
78#include <net/if_var.h>
79#include <net/route.h>
80#include <net/route_var.h>
81
82#include <netinet/in.h>
83#include <netinet/ip_var.h>
84#include <netinet/in_var.h>
85
86#include <netinet/ip6.h>
87#include <netinet6/ip6_var.h>
88
89#include <netinet/icmp6.h>
90#include <netinet6/nd6.h>
91
92#include <netinet/tcp.h>
93#include <netinet/tcp_seq.h>
94#include <netinet/tcp_timer.h>
95#include <netinet/tcp_var.h>
96
97extern int	in6_inithead(void **head, int off);
98#ifdef VIMAGE
99extern int	in6_detachhead(void **head, int off);
100#endif
101
102/*
103 * Do what we need to do when inserting a route.
104 */
105static struct radix_node *
106in6_addroute(void *v_arg, void *n_arg, struct radix_head *head,
107    struct radix_node *treenodes)
108{
109	struct rtentry *rt = (struct rtentry *)treenodes;
110	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)rt_key(rt);
111
112	if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
113		rt->rt_flags |= RTF_MULTICAST;
114
115	/*
116	 * A little bit of help for both IPv6 output and input:
117	 *   For local addresses, we make sure that RTF_LOCAL is set,
118	 *   with the thought that this might one day be used to speed up
119	 *   ip_input().
120	 *
121	 * We also mark routes to multicast addresses as such, because
122	 * it's easy to do and might be useful (but this is much more
123	 * dubious since it's so easy to inspect the address).  (This
124	 * is done above.)
125	 *
126	 * XXX
127	 * should elaborate the code.
128	 */
129	if (rt->rt_flags & RTF_HOST) {
130		if (IN6_ARE_ADDR_EQUAL(&satosin6(rt->rt_ifa->ifa_addr)
131					->sin6_addr,
132				       &sin6->sin6_addr)) {
133			rt->rt_flags |= RTF_LOCAL;
134		}
135	}
136
137	if (rt->rt_ifp != NULL) {
138
139		/*
140		 * Check route MTU:
141		 * inherit interface MTU if not set or
142		 * check if MTU is too large.
143		 */
144		if (rt->rt_mtu == 0) {
145			rt->rt_mtu = IN6_LINKMTU(rt->rt_ifp);
146		} else if (rt->rt_mtu > IN6_LINKMTU(rt->rt_ifp))
147			rt->rt_mtu = IN6_LINKMTU(rt->rt_ifp);
148	}
149
150	return (rn_addroute(v_arg, n_arg, head, treenodes));
151}
152
153/*
154 * Age old PMTUs.
155 */
156struct mtuex_arg {
157	struct rib_head *rnh;
158	time_t nextstop;
159};
160static VNET_DEFINE(struct callout, rtq_mtutimer);
161#define	V_rtq_mtutimer			VNET(rtq_mtutimer)
162
163static int
164in6_mtuexpire(struct rtentry *rt, void *rock)
165{
166	struct mtuex_arg *ap = rock;
167
168	if (rt->rt_expire && !(rt->rt_flags & RTF_PROBEMTU)) {
169		if (rt->rt_expire <= time_uptime) {
170			rt->rt_flags |= RTF_PROBEMTU;
171		} else {
172			ap->nextstop = lmin(ap->nextstop, rt->rt_expire);
173		}
174	}
175
176	return (0);
177}
178
179#define	MTUTIMO_DEFAULT	(60*1)
180
181static void
182in6_mtutimo_setwa(struct rib_head *rnh, uint32_t fibum, int af,
183    void *_arg)
184{
185	struct mtuex_arg *arg;
186
187	arg = (struct mtuex_arg *)_arg;
188
189	arg->rnh = rnh;
190}
191
192static void
193in6_mtutimo(void *rock)
194{
195	CURVNET_SET_QUIET((struct vnet *) rock);
196	struct timeval atv;
197	struct mtuex_arg arg;
198
199	rt_foreach_fib_walk(AF_INET6, in6_mtutimo_setwa, in6_mtuexpire, &arg);
200
201	atv.tv_sec = MTUTIMO_DEFAULT;
202	atv.tv_usec = 0;
203	callout_reset(&V_rtq_mtutimer, tvtohz(&atv), in6_mtutimo, rock);
204	CURVNET_RESTORE();
205}
206
207/*
208 * Initialize our routing tree.
209 */
210static VNET_DEFINE(int, _in6_rt_was_here);
211#define	V__in6_rt_was_here	VNET(_in6_rt_was_here)
212
213int
214in6_inithead(void **head, int off)
215{
216	struct rib_head *rh;
217
218	rh = rt_table_init(offsetof(struct sockaddr_in6, sin6_addr) << 3);
219	if (rh == NULL)
220		return (0);
221
222	rh->rnh_addaddr = in6_addroute;
223	*head = (void *)rh;
224
225	if (V__in6_rt_was_here == 0) {
226		callout_init(&V_rtq_mtutimer, 1);
227		in6_mtutimo(curvnet);	/* kick off timeout first time */
228		V__in6_rt_was_here = 1;
229	}
230
231	return (1);
232}
233
234#ifdef VIMAGE
235int
236in6_detachhead(void **head, int off)
237{
238
239	callout_drain(&V_rtq_mtutimer);
240	return (rn_detachhead(head));
241}
242#endif
243
244/*
245 * Extended API for IPv6 FIB support.
246 */
247void
248in6_rtredirect(struct sockaddr *dst, struct sockaddr *gw, struct sockaddr *nm,
249    int flags, struct sockaddr *src, u_int fibnum)
250{
251
252	rtredirect_fib(dst, gw, nm, flags, src, fibnum);
253}
254
255int
256in6_rtrequest(int req, struct sockaddr *dst, struct sockaddr *gw,
257    struct sockaddr *mask, int flags, struct rtentry **ret_nrt, u_int fibnum)
258{
259
260	return (rtrequest_fib(req, dst, gw, mask, flags, ret_nrt, fibnum));
261}
262
263void
264in6_rtalloc(struct route_in6 *ro, u_int fibnum)
265{
266
267	rtalloc_ign_fib((struct route *)ro, 0ul, fibnum);
268}
269
270void
271in6_rtalloc_ign(struct route_in6 *ro, u_long ignflags, u_int fibnum)
272{
273
274	rtalloc_ign_fib((struct route *)ro, ignflags, fibnum);
275}
276
277struct rtentry *
278in6_rtalloc1(struct sockaddr *dst, int report, u_long ignflags, u_int fibnum)
279{
280
281	return (rtalloc1_fib(dst, report, ignflags, fibnum));
282}
283