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 #define ROUNDUP(a, size) \ 61 (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a)) 62 63 #define NEXT_SA(ap) (ap) = (struct sockaddr *) \ 64 ((caddr_t)(ap) + \ 65 ((ap)->sa_len ? ROUNDUP((ap)->sa_len, sizeof(u_long)) \ 66 : sizeof(u_long))) 67 68 #ifdef RTM_IFANNOUNCE /*NetBSD 1.5 or later*/ 69 static int rtsock_input_ifannounce(int, struct rt_msghdr *, char *); 70 #endif 71 72 static struct { 73 u_char type; 74 size_t minlen; 75 int (*func)(int, struct rt_msghdr *, char *); 76 } rtsock_dispatch[] = { 77 #ifdef RTM_IFANNOUNCE /*NetBSD 1.5 or later*/ 78 { RTM_IFANNOUNCE, sizeof(struct if_announcemsghdr), 79 rtsock_input_ifannounce }, 80 #endif 81 { 0, 0, NULL }, 82 }; 83 84 int 85 rtsock_open(void) 86 { 87 88 return (socket(PF_ROUTE, SOCK_RAW, 0)); 89 } 90 91 int 92 rtsock_input(int s) 93 { 94 ssize_t n; 95 char msg[2048]; 96 char *lim, *next; 97 struct rt_msghdr *rtm; 98 int idx; 99 ssize_t len; 100 int ret = 0; 101 const ssize_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 *)(void *)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, __func__, 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, __func__, 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(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 #endif 178