1 /* 2 * Copyright (c) 2009 Hiroki Sato. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 */ 25 26 #ifndef lint 27 static const char rcsid[] = 28 "$FreeBSD$"; 29 #endif /* not lint */ 30 31 #include <sys/param.h> 32 #include <sys/ioctl.h> 33 #include <sys/socket.h> 34 #include <sys/sysctl.h> 35 #include <net/if.h> 36 #include <net/route.h> 37 38 #include <err.h> 39 #include <errno.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <unistd.h> 44 #include <ifaddrs.h> 45 46 #include <arpa/inet.h> 47 48 #include <netinet/in.h> 49 #include <net/if_var.h> 50 #include <netinet/in_var.h> 51 #include <arpa/inet.h> 52 #include <netdb.h> 53 54 #include <netinet6/nd6.h> 55 56 #include "ifconfig.h" 57 58 #define MAX_SYSCTL_TRY 5 59 #define ND6BITS "\020\001PERFORMNUD\002ACCEPT_RTADV\003PREFER_SOURCE" \ 60 "\004IFDISABLED\005DONT_SET_IFROUTE\006AUTO_LINKLOCAL" \ 61 "\020DEFAULTIF" 62 63 static int isnd6defif(int); 64 void setnd6flags(const char *, int, int, const struct afswtch *); 65 void setnd6defif(const char *, int, int, const struct afswtch *); 66 67 void 68 setnd6flags(const char *dummyaddr __unused, 69 int d, int s, 70 const struct afswtch *afp) 71 { 72 struct in6_ndireq nd; 73 int error; 74 75 memset(&nd, 0, sizeof(nd)); 76 strncpy(nd.ifname, ifr.ifr_name, sizeof(nd.ifname)); 77 error = ioctl(s, SIOCGIFINFO_IN6, &nd); 78 if (error) { 79 warn("ioctl(SIOCGIFINFO_IN6)"); 80 return; 81 } 82 if (d < 0) 83 nd.ndi.flags &= ~(-d); 84 else 85 nd.ndi.flags |= d; 86 error = ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd); 87 if (error) 88 warn("ioctl(SIOCSIFINFO_IN6)"); 89 } 90 91 void 92 setnd6defif(const char *dummyaddr __unused, 93 int d, int s, 94 const struct afswtch *afp) 95 { 96 struct in6_ndifreq ndifreq; 97 int ifindex; 98 int error; 99 100 memset(&ndifreq, 0, sizeof(ndifreq)); 101 strncpy(ndifreq.ifname, ifr.ifr_name, sizeof(ndifreq.ifname)); 102 103 if (d < 0) { 104 if (isnd6defif(s)) { 105 /* ifindex = 0 means to remove default if */ 106 ifindex = 0; 107 } else 108 return; 109 } else if ((ifindex = if_nametoindex(ndifreq.ifname)) == 0) { 110 warn("if_nametoindex(%s)", ndifreq.ifname); 111 return; 112 } 113 114 ndifreq.ifindex = ifindex; 115 error = ioctl(s, SIOCSDEFIFACE_IN6, (caddr_t)&ndifreq); 116 if (error) 117 warn("ioctl(SIOCSDEFIFACE_IN6)"); 118 } 119 120 static int 121 isnd6defif(int s) 122 { 123 struct in6_ndifreq ndifreq; 124 unsigned int ifindex; 125 int error; 126 127 memset(&ndifreq, 0, sizeof(ndifreq)); 128 strncpy(ndifreq.ifname, ifr.ifr_name, sizeof(ndifreq.ifname)); 129 130 ifindex = if_nametoindex(ndifreq.ifname); 131 error = ioctl(s, SIOCGDEFIFACE_IN6, (caddr_t)&ndifreq); 132 if (error) { 133 warn("ioctl(SIOCGDEFIFACE_IN6)"); 134 return (error); 135 } 136 return (ndifreq.ifindex == ifindex); 137 } 138 139 static void 140 nd6_status(int s) 141 { 142 struct in6_ndireq nd; 143 struct rt_msghdr *rtm; 144 size_t needed; 145 char *buf, *next; 146 int mib[6], ntry; 147 int s6; 148 int error; 149 int isinet6, isdefif; 150 151 /* Check if the interface has at least one IPv6 address. */ 152 mib[0] = CTL_NET; 153 mib[1] = PF_ROUTE; 154 mib[2] = 0; 155 mib[3] = AF_INET6; 156 mib[4] = NET_RT_IFLIST; 157 mib[5] = if_nametoindex(ifr.ifr_name); 158 159 /* Try to prevent a race between two sysctls. */ 160 ntry = 0; 161 do { 162 error = sysctl(mib, 6, NULL, &needed, NULL, 0); 163 if (error) { 164 warn("sysctl(NET_RT_IFLIST)/estimate"); 165 return; 166 } 167 buf = malloc(needed); 168 if (buf == NULL) { 169 warn("malloc for sysctl(NET_RT_IFLIST) failed"); 170 return; 171 } 172 if ((error = sysctl(mib, 6, buf, &needed, NULL, 0)) < 0) { 173 if (errno != ENOMEM || ++ntry >= MAX_SYSCTL_TRY) { 174 warn("sysctl(NET_RT_IFLIST)/get"); 175 free(buf); 176 return; 177 } 178 free(buf); 179 buf = NULL; 180 } 181 } while (buf == NULL); 182 183 isinet6 = 0; 184 for (next = buf; next < buf + needed; next += rtm->rtm_msglen) { 185 rtm = (struct rt_msghdr *)next; 186 187 if (rtm->rtm_version != RTM_VERSION) 188 continue; 189 if (rtm->rtm_type == RTM_NEWADDR) { 190 isinet6 = 1; 191 break; 192 } 193 } 194 free(buf); 195 if (!isinet6) 196 return; 197 198 memset(&nd, 0, sizeof(nd)); 199 strncpy(nd.ifname, ifr.ifr_name, sizeof(nd.ifname)); 200 if ((s6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 201 warn("socket(AF_INET6, SOCK_DGRAM)"); 202 return; 203 } 204 error = ioctl(s6, SIOCGIFINFO_IN6, &nd); 205 if (error) { 206 warn("ioctl(SIOCGIFINFO_IN6)"); 207 close(s6); 208 return; 209 } 210 isdefif = isnd6defif(s6); 211 close(s6); 212 if (nd.ndi.flags == 0 && !isdefif) 213 return; 214 printb("\tnd6 options", 215 (unsigned int)(nd.ndi.flags | (isdefif << 15)), ND6BITS); 216 putchar('\n'); 217 } 218 219 static struct afswtch af_nd6 = { 220 .af_name = "nd6", 221 .af_af = AF_LOCAL, 222 .af_other_status= nd6_status, 223 }; 224 225 static __constructor void 226 nd6_ctor(void) 227 { 228 af_register(&af_nd6); 229 } 230