1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2009 Hiroki Sato. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/param.h> 29 #include <sys/ioctl.h> 30 #include <sys/socket.h> 31 #include <sys/sysctl.h> 32 #include <net/if.h> 33 #include <net/route.h> 34 35 #include <err.h> 36 #include <errno.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <string.h> 40 #include <unistd.h> 41 #include <ifaddrs.h> 42 43 #include <arpa/inet.h> 44 45 #include <netinet/in.h> 46 #include <netinet/in_var.h> 47 #include <arpa/inet.h> 48 #include <netdb.h> 49 50 #include <netinet6/nd6.h> 51 52 #include "ifconfig.h" 53 54 #define MAX_SYSCTL_TRY 5 55 #ifdef DRAFT_IETF_6MAN_IPV6ONLY_FLAG 56 #define ND6BITS "\020\001PERFORMNUD\002ACCEPT_RTADV\003PREFER_SOURCE" \ 57 "\004IFDISABLED\005DONT_SET_IFROUTE\006AUTO_LINKLOCAL" \ 58 "\007NO_RADR\010NO_PREFER_IFACE\011NO_DAD" \ 59 "\012IPV6_ONLY\013IPV6_ONLY_MANUAL" \ 60 "\020DEFAULTIF" 61 #else 62 #define ND6BITS "\020\001PERFORMNUD\002ACCEPT_RTADV\003PREFER_SOURCE" \ 63 "\004IFDISABLED\005DONT_SET_IFROUTE\006AUTO_LINKLOCAL" \ 64 "\007NO_RADR\010NO_PREFER_IFACE\011NO_DAD\020DEFAULTIF" 65 #endif 66 67 static int isnd6defif(if_ctx *ctx, int s); 68 void setnd6flags(if_ctx *, const char *, int); 69 void setnd6defif(if_ctx *,const char *, int); 70 void nd6_status(if_ctx *); 71 72 void 73 setnd6flags(if_ctx *ctx, const char *dummyaddr __unused, int d) 74 { 75 struct in6_ndireq nd = {}; 76 int error; 77 78 strlcpy(nd.ifname, ctx->ifname, sizeof(nd.ifname)); 79 error = ioctl_ctx(ctx, SIOCGIFINFO_IN6, &nd); 80 if (error) { 81 warn("ioctl(SIOCGIFINFO_IN6)"); 82 return; 83 } 84 if (d < 0) 85 nd.ndi.flags &= ~(-d); 86 else 87 nd.ndi.flags |= d; 88 error = ioctl_ctx(ctx, SIOCSIFINFO_IN6, (caddr_t)&nd); 89 if (error) 90 warn("ioctl(SIOCSIFINFO_IN6)"); 91 } 92 93 void 94 setnd6defif(if_ctx *ctx, const char *dummyaddr __unused, int d) 95 { 96 struct in6_ndifreq ndifreq = {}; 97 int ifindex; 98 int error; 99 100 strlcpy(ndifreq.ifname, ctx->ifname, sizeof(ndifreq.ifname)); 101 102 if (d < 0) { 103 if (isnd6defif(ctx, ctx->io_s)) { 104 /* ifindex = 0 means to remove default if */ 105 ifindex = 0; 106 } else 107 return; 108 } else if ((ifindex = if_nametoindex(ndifreq.ifname)) == 0) { 109 warn("if_nametoindex(%s)", ndifreq.ifname); 110 return; 111 } 112 113 ndifreq.ifindex = ifindex; 114 error = ioctl_ctx(ctx, SIOCSDEFIFACE_IN6, (caddr_t)&ndifreq); 115 if (error) 116 warn("ioctl(SIOCSDEFIFACE_IN6)"); 117 } 118 119 static int 120 isnd6defif(if_ctx *ctx, int s) 121 { 122 struct in6_ndifreq ndifreq = {}; 123 unsigned int ifindex; 124 int error; 125 126 strlcpy(ndifreq.ifname, ctx->ifname, sizeof(ndifreq.ifname)); 127 128 ifindex = if_nametoindex(ndifreq.ifname); 129 error = ioctl(s, SIOCGDEFIFACE_IN6, (caddr_t)&ndifreq); 130 if (error) { 131 warn("ioctl(SIOCGDEFIFACE_IN6)"); 132 return (error); 133 } 134 return (ndifreq.ifindex == ifindex); 135 } 136 137 void 138 nd6_status(if_ctx *ctx) 139 { 140 struct in6_ndireq nd = {}; 141 int s6; 142 int error; 143 int isdefif; 144 145 strlcpy(nd.ifname, ctx->ifname, sizeof(nd.ifname)); 146 if ((s6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 147 if (errno != EAFNOSUPPORT && errno != EPROTONOSUPPORT) 148 warn("socket(AF_INET6, SOCK_DGRAM)"); 149 return; 150 } 151 error = ioctl(s6, SIOCGIFINFO_IN6, &nd); 152 if (error) { 153 if (errno != EPFNOSUPPORT) 154 warn("ioctl(SIOCGIFINFO_IN6)"); 155 close(s6); 156 return; 157 } 158 isdefif = isnd6defif(ctx, s6); 159 close(s6); 160 if (nd.ndi.flags == 0 && !isdefif) 161 return; 162 printb("\tnd6 options", 163 (unsigned int)(nd.ndi.flags | (isdefif << 15)), ND6BITS); 164 putchar('\n'); 165 } 166