xref: /freebsd/sys/netinet6/in6_rmx.c (revision 65a1d63665bf8b9cd2596d4319b31efc2232b722)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. Neither the name of the project nor the names of its contributors
16  *    may be used to endorse or promote products derived from this software
17  *    without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  *
31  *	$KAME: in6_rmx.c,v 1.11 2001/07/26 06:53:16 jinmei Exp $
32  */
33 
34 /*-
35  * Copyright 1994, 1995 Massachusetts Institute of Technology
36  *
37  * Permission to use, copy, modify, and distribute this software and
38  * its documentation for any purpose and without fee is hereby
39  * granted, provided that both the above copyright notice and this
40  * permission notice appear in all copies, that both the above
41  * copyright notice and this permission notice appear in all
42  * supporting documentation, and that the name of M.I.T. not be used
43  * in advertising or publicity pertaining to distribution of the
44  * software without specific, written prior permission.  M.I.T. makes
45  * no representations about the suitability of this software for any
46  * purpose.  It is provided "as is" without express or implied
47  * warranty.
48  *
49  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
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
56  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
57  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
58  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
59  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60  * SUCH DAMAGE.
61  *
62  */
63 
64 #include <sys/cdefs.h>
65 __FBSDID("$FreeBSD$");
66 
67 #include "opt_mpath.h"
68 
69 #include <sys/param.h>
70 #include <sys/systm.h>
71 #include <sys/kernel.h>
72 #include <sys/lock.h>
73 #include <sys/queue.h>
74 #include <sys/socket.h>
75 #include <sys/socketvar.h>
76 #include <sys/mbuf.h>
77 #include <sys/rwlock.h>
78 #include <sys/syslog.h>
79 #include <sys/callout.h>
80 
81 #include <net/if.h>
82 #include <net/if_var.h>
83 #include <net/route.h>
84 #include <net/route/route_var.h>
85 #include <net/route/nhop.h>
86 #include <net/route/shared.h>
87 
88 #include <netinet/in.h>
89 #include <netinet/ip_var.h>
90 #include <netinet/in_var.h>
91 
92 #include <netinet/ip6.h>
93 #include <netinet6/ip6_var.h>
94 
95 #include <netinet/icmp6.h>
96 #include <netinet6/nd6.h>
97 
98 #include <netinet/tcp.h>
99 #include <netinet/tcp_seq.h>
100 #include <netinet/tcp_timer.h>
101 #include <netinet/tcp_var.h>
102 
103 extern int	in6_inithead(void **head, int off, u_int fibnum);
104 #ifdef VIMAGE
105 extern int	in6_detachhead(void **head, int off);
106 #endif
107 
108 static int
109 rib6_preadd(u_int fibnum, const struct sockaddr *addr, const struct sockaddr *mask,
110     struct nhop_object *nh)
111 {
112 	uint16_t nh_type;
113 
114 	/* XXX: RTF_LOCAL */
115 
116 	/*
117 	 * Check route MTU:
118 	 * inherit interface MTU if not set or
119 	 * check if MTU is too large.
120 	 */
121 	if (nh->nh_mtu == 0) {
122 		nh->nh_mtu = IN6_LINKMTU(nh->nh_ifp);
123 	} else if (nh->nh_mtu > IN6_LINKMTU(nh->nh_ifp))
124 		nh->nh_mtu = IN6_LINKMTU(nh->nh_ifp);
125 
126 	/* Ensure that default route nhop has special flag */
127 	const struct sockaddr_in6 *mask6 = (const struct sockaddr_in6 *)mask;
128 	if ((nhop_get_rtflags(nh) & RTF_HOST) == 0 && mask6 != NULL &&
129 	    IN6_IS_ADDR_UNSPECIFIED(&mask6->sin6_addr))
130 		nh->nh_flags |= NHF_DEFAULT;
131 
132 	/* Set nexthop type */
133 	if (nhop_get_type(nh) == 0) {
134 		if (nh->nh_flags & NHF_GATEWAY)
135 			nh_type = NH_TYPE_IPV6_ETHER_NHOP;
136 		else
137 			nh_type = NH_TYPE_IPV6_ETHER_RSLV;
138 
139 		nhop_set_type(nh, nh_type);
140 	}
141 
142 	return (0);
143 }
144 
145 /*
146  * Initialize our routing tree.
147  */
148 
149 int
150 in6_inithead(void **head, int off, u_int fibnum)
151 {
152 	struct rib_head *rh;
153 
154 	rh = rt_table_init(offsetof(struct sockaddr_in6, sin6_addr) << 3,
155 	    AF_INET6, fibnum);
156 	if (rh == NULL)
157 		return (0);
158 
159 	rh->rnh_preadd = rib6_preadd;
160 #ifdef	RADIX_MPATH
161 	rt_mpath_init_rnh(rh);
162 #endif
163 	*head = (void *)rh;
164 
165 	return (1);
166 }
167 
168 #ifdef VIMAGE
169 int
170 in6_detachhead(void **head, int off)
171 {
172 
173 	rt_table_destroy((struct rib_head *)(*head));
174 
175 	return (1);
176 }
177 #endif
178 
179 /*
180  * Extended API for IPv6 FIB support.
181  */
182 int
183 in6_rtrequest(int req, struct sockaddr *dst, struct sockaddr *gw,
184     struct sockaddr *mask, int flags, struct rtentry **ret_nrt, u_int fibnum)
185 {
186 
187 	return (rtrequest_fib(req, dst, gw, mask, flags, ret_nrt, fibnum));
188 }
189 
190