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 static const char *ND6BITS[] = { 56 [0] = "PERFORMNUD", 57 [1] = "ACCEPT_RTADV", 58 [2] = "PREFER_SOURCE", 59 [3] = "IFDISABLED", 60 [4] = "DONT_SET_IFROUTE", 61 [5] = "AUTO_LINKLOCAL", 62 [6] = "NO_RADR", 63 [7] = "NO_PREFER_IFACE", 64 [8] = "NO_DAD", 65 #ifdef DRAFT_IETF_6MAN_IPV6ONLY_FLAG 66 [9] = "IPV6_ONLY", 67 [10] = "IPV6_ONLY_MANUAL", 68 #endif 69 [15] = "DEFAULTIF", 70 }; 71 72 static int isnd6defif(if_ctx *ctx, int s); 73 void setnd6flags(if_ctx *, const char *, int); 74 void setnd6defif(if_ctx *,const char *, int); 75 void nd6_status(if_ctx *); 76 77 void 78 setnd6flags(if_ctx *ctx, const char *dummyaddr __unused, int d) 79 { 80 struct in6_ndireq nd = {}; 81 int error; 82 83 strlcpy(nd.ifname, ctx->ifname, sizeof(nd.ifname)); 84 error = ioctl_ctx(ctx, SIOCGIFINFO_IN6, &nd); 85 if (error) { 86 warn("ioctl(SIOCGIFINFO_IN6)"); 87 return; 88 } 89 if (d < 0) 90 nd.ndi.flags &= ~(-d); 91 else 92 nd.ndi.flags |= d; 93 error = ioctl_ctx(ctx, SIOCSIFINFO_IN6, (caddr_t)&nd); 94 if (error) 95 warn("ioctl(SIOCSIFINFO_IN6)"); 96 } 97 98 void 99 setnd6defif(if_ctx *ctx, const char *dummyaddr __unused, int d) 100 { 101 struct in6_ndifreq ndifreq = {}; 102 int ifindex; 103 int error; 104 105 strlcpy(ndifreq.ifname, ctx->ifname, sizeof(ndifreq.ifname)); 106 107 if (d < 0) { 108 if (isnd6defif(ctx, ctx->io_s)) { 109 /* ifindex = 0 means to remove default if */ 110 ifindex = 0; 111 } else 112 return; 113 } else if ((ifindex = if_nametoindex(ndifreq.ifname)) == 0) { 114 warn("if_nametoindex(%s)", ndifreq.ifname); 115 return; 116 } 117 118 ndifreq.ifindex = ifindex; 119 error = ioctl_ctx(ctx, SIOCSDEFIFACE_IN6, (caddr_t)&ndifreq); 120 if (error) 121 warn("ioctl(SIOCSDEFIFACE_IN6)"); 122 } 123 124 static int 125 isnd6defif(if_ctx *ctx, int s) 126 { 127 struct in6_ndifreq ndifreq = {}; 128 unsigned int ifindex; 129 int error; 130 131 strlcpy(ndifreq.ifname, ctx->ifname, sizeof(ndifreq.ifname)); 132 133 ifindex = if_nametoindex(ndifreq.ifname); 134 error = ioctl(s, SIOCGDEFIFACE_IN6, (caddr_t)&ndifreq); 135 if (error) { 136 warn("ioctl(SIOCGDEFIFACE_IN6)"); 137 return (error); 138 } 139 return (ndifreq.ifindex == ifindex); 140 } 141 142 void 143 nd6_status(if_ctx *ctx) 144 { 145 struct in6_ndireq nd = {}; 146 int s6; 147 int error; 148 int isdefif; 149 uint32_t bits; 150 151 strlcpy(nd.ifname, ctx->ifname, sizeof(nd.ifname)); 152 if ((s6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 153 if (errno != EAFNOSUPPORT && errno != EPROTONOSUPPORT) 154 warn("socket(AF_INET6, SOCK_DGRAM)"); 155 return; 156 } 157 error = ioctl(s6, SIOCGIFINFO_IN6, &nd); 158 if (error) { 159 if (errno != EPFNOSUPPORT) 160 warn("ioctl(SIOCGIFINFO_IN6)"); 161 close(s6); 162 return; 163 } 164 isdefif = isnd6defif(ctx, s6); 165 close(s6); 166 if (nd.ndi.flags == 0 && !isdefif) 167 return; 168 bits = (nd.ndi.flags | (isdefif << 15)); 169 printf("\tnd6 options=%x", bits); 170 print_bits("options", &bits, 1, ND6BITS, nitems(ND6BITS)); 171 putchar('\n'); 172 } 173