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 /* $DragonFly: src/usr.sbin/rtsold/rtsock.c,v 1.3 2003/11/03 19:31:43 eirikn Exp $ */ 4 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/socket.h> 36 #include <sys/uio.h> 37 #include <sys/time.h> 38 #include <sys/queue.h> 39 40 #include <net/if.h> 41 #include <net/route.h> 42 #include <net/if_dl.h> 43 44 #include <netinet/in.h> 45 #include <netinet/ip6.h> 46 #include <netinet/icmp6.h> 47 48 #include <time.h> 49 #include <unistd.h> 50 #include <stdio.h> 51 #include <stddef.h> 52 #include <err.h> 53 #include <errno.h> 54 #include <string.h> 55 #include <stdlib.h> 56 #include <syslog.h> 57 #include "rtsold.h" 58 59 #define ROUNDUP(a, size) \ 60 (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a)) 61 62 #define NEXT_SA(ap) (ap) = (struct sockaddr *) \ 63 ((caddr_t)(ap) + \ 64 ((ap)->sa_len ? ROUNDUP((ap)->sa_len, sizeof(u_long)) \ 65 : sizeof(u_long))) 66 67 #ifdef RTM_IFANNOUNCE /*NetBSD 1.5 or later*/ 68 static int rtsock_input_ifannounce(int, struct rt_msghdr *, char *); 69 #endif 70 71 static struct { 72 u_char type; 73 size_t minlen; 74 int (*func)(int, struct rt_msghdr *, char *); 75 } rtsock_dispatch[] = { 76 #ifdef RTM_IFANNOUNCE /*NetBSD 1.5 or later*/ 77 { RTM_IFANNOUNCE, sizeof(struct if_announcemsghdr), 78 rtsock_input_ifannounce }, 79 #endif 80 { 0, NULL }, 81 }; 82 83 int 84 rtsock_open() 85 { 86 87 return socket(PF_ROUTE, SOCK_RAW, 0); 88 } 89 90 int 91 rtsock_input(s) 92 int s; 93 { 94 ssize_t n; 95 char msg[2048]; 96 char *lim, *next; 97 struct rt_msghdr *rtm; 98 int idx; 99 size_t len; 100 int ret = 0; 101 const size_t lenlim = 102 offsetof(struct rt_msghdr, rtm_msglen) + sizeof(rtm->rtm_msglen); 103 104 n = read(s, msg, sizeof(msg)); 105 106 lim = msg + n; 107 for (next = msg; next < lim; next += len) { 108 rtm = (struct rt_msghdr *)next; 109 if (lim - next < lenlim) 110 break; 111 len = rtm->rtm_msglen; 112 if (len < lenlim) 113 break; 114 115 if (dflag > 1) { 116 warnmsg(LOG_INFO, __FUNCTION__, 117 "rtmsg type %d, len=%lu", rtm->rtm_type, 118 (u_long)len); 119 } 120 121 for (idx = 0; rtsock_dispatch[idx].func; idx++) { 122 if (rtm->rtm_type != rtsock_dispatch[idx].type) 123 continue; 124 if (rtm->rtm_msglen < rtsock_dispatch[idx].minlen) { 125 warnmsg(LOG_INFO, __FUNCTION__, 126 "rtmsg type %d too short!", rtm->rtm_type); 127 continue; 128 } 129 130 ret = (*rtsock_dispatch[idx].func)(s, rtm, lim); 131 break; 132 } 133 } 134 135 return ret; 136 } 137 138 #ifdef RTM_IFANNOUNCE /*NetBSD 1.5 or later*/ 139 static int 140 rtsock_input_ifannounce(s, rtm, lim) 141 int s; 142 struct rt_msghdr *rtm; 143 char *lim; 144 { 145 struct if_announcemsghdr *ifan; 146 struct ifinfo *ifinfo; 147 148 ifan = (struct if_announcemsghdr *)rtm; 149 if ((char *)(ifan + 1) > lim) 150 return -1; 151 152 switch (ifan->ifan_what) { 153 case IFAN_ARRIVAL: 154 /* 155 * XXX for NetBSD 1.5, interface index will monotonically be 156 * increased as new pcmcia card gets inserted. 157 * we may be able to do a name-based interface match, 158 * and call ifreconfig() to enable the interface again. 159 */ 160 warnmsg(LOG_INFO, __FUNCTION__, 161 "interface %s inserted", ifan->ifan_name); 162 break; 163 case IFAN_DEPARTURE: 164 warnmsg(LOG_WARNING, __FUNCTION__, 165 "interface %s removed", ifan->ifan_name); 166 ifinfo = find_ifinfo(ifan->ifan_index); 167 if (ifinfo) { 168 if (dflag > 1) { 169 warnmsg(LOG_INFO, __FUNCTION__, 170 "bring interface %s to DOWN state", 171 ifan->ifan_name); 172 } 173 ifinfo->state = IFS_DOWN; 174 } 175 break; 176 } 177 178 return 0; 179 } 180 #endif 181