1 /* $KAME: rtsock.c,v 1.3 2000/10/10 08:46:45 itojun Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (C) 2000 WIDE Project.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #include <sys/param.h>
35 #include <sys/capsicum.h>
36 #include <sys/queue.h>
37 #include <sys/socket.h>
38 #include <sys/time.h>
39 #include <sys/uio.h>
40
41 #include <net/if.h>
42 #include <net/route.h>
43 #include <net/if_dl.h>
44
45 #include <netinet/in.h>
46 #include <netinet/ip6.h>
47 #include <netinet/icmp6.h>
48
49 #include <capsicum_helpers.h>
50 #include <time.h>
51 #include <unistd.h>
52 #include <stdio.h>
53 #include <stddef.h>
54 #include <err.h>
55 #include <errno.h>
56 #include <string.h>
57 #include <stdlib.h>
58 #include <syslog.h>
59 #include "rtsold.h"
60
61 static int rtsock_input_ifannounce(int, struct rt_msghdr *, char *);
62
63 static struct {
64 u_char type;
65 size_t minlen;
66 int (*func)(int, struct rt_msghdr *, char *);
67 } rtsock_dispatch[] = {
68 { RTM_IFANNOUNCE, sizeof(struct if_announcemsghdr),
69 rtsock_input_ifannounce },
70 { 0, 0, NULL },
71 };
72
73 int
rtsock_open(void)74 rtsock_open(void)
75 {
76 cap_rights_t rights;
77 int error, s;
78
79 s = socket(PF_ROUTE, SOCK_RAW, 0);
80 if (s < 0)
81 return (s);
82 cap_rights_init(&rights, CAP_EVENT, CAP_READ);
83 if (caph_rights_limit(s, &rights) != 0) {
84 error = errno;
85 (void)close(s);
86 errno = error;
87 return (-1);
88 }
89 return (s);
90 }
91
92 int
rtsock_input(int s)93 rtsock_input(int s)
94 {
95 ssize_t n;
96 char msg[2048];
97 char *lim, *next;
98 struct rt_msghdr *rtm;
99 int idx;
100 ssize_t len;
101 int ret = 0;
102 const ssize_t lenlim =
103 offsetof(struct rt_msghdr, rtm_msglen) + sizeof(rtm->rtm_msglen);
104
105 n = read(s, msg, sizeof(msg));
106
107 lim = msg + n;
108 for (next = msg; next < lim; next += len) {
109 rtm = (struct rt_msghdr *)(void *)next;
110 if (lim - next < lenlim)
111 break;
112 len = rtm->rtm_msglen;
113 if (len < lenlim)
114 break;
115
116 if (dflag > 1) {
117 warnmsg(LOG_INFO, __func__,
118 "rtmsg type %d, len=%lu", rtm->rtm_type,
119 (u_long)len);
120 }
121
122 for (idx = 0; rtsock_dispatch[idx].func; idx++) {
123 if (rtm->rtm_type != rtsock_dispatch[idx].type)
124 continue;
125 if (rtm->rtm_msglen < rtsock_dispatch[idx].minlen) {
126 warnmsg(LOG_INFO, __func__,
127 "rtmsg type %d too short!", rtm->rtm_type);
128 continue;
129 }
130
131 ret = (*rtsock_dispatch[idx].func)(s, rtm, lim);
132 break;
133 }
134 }
135
136 return (ret);
137 }
138
139 static int
rtsock_input_ifannounce(int s __unused,struct rt_msghdr * rtm,char * lim)140 rtsock_input_ifannounce(int s __unused, struct rt_msghdr *rtm, char *lim)
141 {
142 struct if_announcemsghdr *ifan;
143 struct ifinfo *ifi;
144
145 ifan = (struct if_announcemsghdr *)rtm;
146 if ((char *)(ifan + 1) > lim)
147 return (-1);
148
149 switch (ifan->ifan_what) {
150 case IFAN_ARRIVAL:
151 /*
152 * XXX for NetBSD 1.5, interface index will monotonically be
153 * increased as new pcmcia card gets inserted.
154 * we may be able to do a name-based interface match,
155 * and call ifreconfig() to enable the interface again.
156 */
157 warnmsg(LOG_INFO, __func__,
158 "interface %s inserted", ifan->ifan_name);
159 break;
160 case IFAN_DEPARTURE:
161 warnmsg(LOG_WARNING, __func__,
162 "interface %s removed", ifan->ifan_name);
163 ifi = find_ifinfo(ifan->ifan_index);
164 if (ifi) {
165 if (dflag > 1) {
166 warnmsg(LOG_INFO, __func__,
167 "bring interface %s to DOWN state",
168 ifan->ifan_name);
169 }
170 ifi->state = IFS_DOWN;
171 }
172 break;
173 }
174
175 return (0);
176 }
177