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 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 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 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