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