1 /* $KAME: rtsock.c,v 1.3 2000/10/10 08:46:45 itojun Exp $ */ 2 /* $FreeBSD: src/usr.sbin/rtsold/rtsock.c,v 1.1.2.1 2001/07/03 11:02:16 ume Exp $ */ 3 4 /* 5 * Copyright (C) 2000 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/param.h> 34 #include <sys/socket.h> 35 #include <sys/uio.h> 36 #include <sys/time.h> 37 #include <sys/queue.h> 38 39 #include <net/if.h> 40 #include <net/route.h> 41 #include <net/if_dl.h> 42 43 #include <netinet/in.h> 44 #include <netinet/ip6.h> 45 #include <netinet/icmp6.h> 46 47 #include <time.h> 48 #include <unistd.h> 49 #include <stdio.h> 50 #include <stddef.h> 51 #include <err.h> 52 #include <errno.h> 53 #include <string.h> 54 #include <stdlib.h> 55 #include <syslog.h> 56 #include "rtsold.h" 57 58 #define ROUNDUP(a, size) \ 59 (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a)) 60 61 #define NEXT_SA(ap) (ap) = (struct sockaddr *) \ 62 ((caddr_t)(ap) + \ 63 ((ap)->sa_len ? ROUNDUP((ap)->sa_len, sizeof(u_long)) \ 64 : sizeof(u_long))) 65 66 #ifdef RTM_IFANNOUNCE /*NetBSD 1.5 or later*/ 67 static int rtsock_input_ifannounce __P((int, struct rt_msghdr *, char *)); 68 #endif 69 70 static struct { 71 u_char type; 72 size_t minlen; 73 int (*func) __P((int, struct rt_msghdr *, char *)); 74 } rtsock_dispatch[] = { 75 #ifdef RTM_IFANNOUNCE /*NetBSD 1.5 or later*/ 76 { RTM_IFANNOUNCE, sizeof(struct if_announcemsghdr), 77 rtsock_input_ifannounce }, 78 #endif 79 { 0, NULL }, 80 }; 81 82 int 83 rtsock_open() 84 { 85 86 return socket(PF_ROUTE, SOCK_RAW, 0); 87 } 88 89 int 90 rtsock_input(s) 91 int s; 92 { 93 ssize_t n; 94 char msg[2048]; 95 char *lim, *next; 96 struct rt_msghdr *rtm; 97 int idx; 98 size_t len; 99 int ret = 0; 100 const size_t lenlim = 101 offsetof(struct rt_msghdr, rtm_msglen) + sizeof(rtm->rtm_msglen); 102 103 n = read(s, msg, sizeof(msg)); 104 105 lim = msg + n; 106 for (next = msg; next < lim; next += len) { 107 rtm = (struct rt_msghdr *)next; 108 if (lim - next < lenlim) 109 break; 110 len = rtm->rtm_msglen; 111 if (len < lenlim) 112 break; 113 114 if (dflag > 1) { 115 warnmsg(LOG_INFO, __FUNCTION__, 116 "rtmsg type %d, len=%lu", rtm->rtm_type, 117 (u_long)len); 118 } 119 120 for (idx = 0; rtsock_dispatch[idx].func; idx++) { 121 if (rtm->rtm_type != rtsock_dispatch[idx].type) 122 continue; 123 if (rtm->rtm_msglen < rtsock_dispatch[idx].minlen) { 124 warnmsg(LOG_INFO, __FUNCTION__, 125 "rtmsg type %d too short!", rtm->rtm_type); 126 continue; 127 } 128 129 ret = (*rtsock_dispatch[idx].func)(s, rtm, lim); 130 break; 131 } 132 } 133 134 return ret; 135 } 136 137 #ifdef RTM_IFANNOUNCE /*NetBSD 1.5 or later*/ 138 static int 139 rtsock_input_ifannounce(s, rtm, lim) 140 int s; 141 struct rt_msghdr *rtm; 142 char *lim; 143 { 144 struct if_announcemsghdr *ifan; 145 struct ifinfo *ifinfo; 146 147 ifan = (struct if_announcemsghdr *)rtm; 148 if ((char *)(ifan + 1) > lim) 149 return -1; 150 151 switch (ifan->ifan_what) { 152 case IFAN_ARRIVAL: 153 /* 154 * XXX for NetBSD 1.5, interface index will monotonically be 155 * increased as new pcmcia card gets inserted. 156 * we may be able to do a name-based interface match, 157 * and call ifreconfig() to enable the interface again. 158 */ 159 warnmsg(LOG_INFO, __FUNCTION__, 160 "interface %s inserted", ifan->ifan_name); 161 break; 162 case IFAN_DEPARTURE: 163 warnmsg(LOG_WARNING, __FUNCTION__, 164 "interface %s removed", ifan->ifan_name); 165 ifinfo = find_ifinfo(ifan->ifan_index); 166 if (ifinfo) { 167 if (dflag > 1) { 168 warnmsg(LOG_INFO, __FUNCTION__, 169 "bring interface %s to DOWN state", 170 ifan->ifan_name); 171 } 172 ifinfo->state = IFS_DOWN; 173 } 174 break; 175 } 176 177 return 0; 178 } 179 #endif 180