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/param.h>
65 #include <sys/systm.h>
66 #include <sys/kernel.h>
67 #include <sys/lock.h>
68 #include <sys/queue.h>
69 #include <sys/socket.h>
70 #include <sys/mbuf.h>
71 #include <sys/rwlock.h>
72 #include <sys/syslog.h>
73 #include <sys/callout.h>
74
75 #include <net/if.h>
76 #include <net/if_var.h>
77 #include <net/if_private.h>
78 #include <net/route.h>
79 #include <net/route/route_ctl.h>
80 #include <net/route/route_var.h>
81 #include <net/route/nhop.h>
82
83 #include <netinet/in.h>
84 #include <netinet/ip_var.h>
85 #include <netinet/in_var.h>
86
87 #include <netinet/ip6.h>
88 #include <netinet6/ip6_var.h>
89
90 #include <netinet/icmp6.h>
91 #include <netinet6/nd6.h>
92
93 static int
rib6_set_nh_pfxflags(u_int fibnum,const struct sockaddr * addr,const struct sockaddr * mask,struct nhop_object * nh)94 rib6_set_nh_pfxflags(u_int fibnum, const struct sockaddr *addr, const struct sockaddr *mask,
95 struct nhop_object *nh)
96 {
97 const struct sockaddr_in6 *mask6 = (const struct sockaddr_in6 *)mask;
98
99 if (mask6 == NULL)
100 nhop_set_pxtype_flag(nh, NHF_HOST);
101 else if (IN6_IS_ADDR_UNSPECIFIED(&mask6->sin6_addr))
102 nhop_set_pxtype_flag(nh, NHF_DEFAULT);
103 else
104 nhop_set_pxtype_flag(nh, 0);
105
106 return (0);
107 }
108
109 static int
rib6_augment_nh(u_int fibnum,struct nhop_object * nh)110 rib6_augment_nh(u_int fibnum, struct nhop_object *nh)
111 {
112 /*
113 * Check route MTU:
114 * inherit interface MTU if not set or
115 * check if MTU is too large.
116 */
117 if (nh->nh_mtu == 0) {
118 nh->nh_mtu = IN6_LINKMTU(nh->nh_ifp);
119 } else if (nh->nh_mtu > IN6_LINKMTU(nh->nh_ifp))
120 nh->nh_mtu = IN6_LINKMTU(nh->nh_ifp);
121
122 /* Set nexthop type */
123 if (nhop_get_type(nh) == 0) {
124 uint16_t nh_type;
125 if (nh->nh_flags & NHF_GATEWAY)
126 nh_type = NH_TYPE_IPV6_ETHER_NHOP;
127 else
128 nh_type = NH_TYPE_IPV6_ETHER_RSLV;
129
130 nhop_set_type(nh, nh_type);
131 }
132
133 return (0);
134 }
135
136 /*
137 * Initialize our routing tree.
138 */
139
140 struct rib_head *
in6_inithead(uint32_t fibnum)141 in6_inithead(uint32_t fibnum)
142 {
143 struct rib_head *rh;
144 struct rib_subscription *rs __diagused;
145
146 rh = rt_table_init(offsetof(struct sockaddr_in6, sin6_addr) << 3,
147 AF_INET6, fibnum);
148 if (rh == NULL)
149 return (NULL);
150
151 rh->rnh_set_nh_pfxflags = rib6_set_nh_pfxflags;
152 rh->rnh_augment_nh = rib6_augment_nh;
153
154 rs = rib_subscribe_internal(rh, nd6_subscription_cb, NULL,
155 RIB_NOTIFY_IMMEDIATE, true);
156 KASSERT(rs != NULL, ("Unable to subscribe to fib %u\n", fibnum));
157
158 return (rh);
159 }
160
161 #ifdef VIMAGE
162 void
in6_detachhead(struct rib_head * rh)163 in6_detachhead(struct rib_head *rh)
164 {
165
166 rt_table_destroy(rh);
167 }
168 #endif
169