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 [11] = "STABLEADDR", 70 [15] = "DEFAULTIF", 71 }; 72 73 static int isnd6defif(if_ctx *ctx, int s); 74 void setnd6flags(if_ctx *, const char *, int); 75 void setnd6defif(if_ctx *,const char *, int); 76 void nd6_status(if_ctx *); 77 78 void 79 setnd6flags(if_ctx *ctx, const char *dummyaddr __unused, int d) 80 { 81 struct in6_ndireq nd = {}; 82 int error; 83 84 strlcpy(nd.ifname, ctx->ifname, sizeof(nd.ifname)); 85 error = ioctl_ctx(ctx, SIOCGIFINFO_IN6, &nd); 86 if (error) { 87 warn("ioctl(SIOCGIFINFO_IN6)"); 88 return; 89 } 90 if (d < 0) 91 nd.ndi.flags &= ~(-d); 92 else 93 nd.ndi.flags |= d; 94 error = ioctl_ctx(ctx, SIOCSIFINFO_IN6, (caddr_t)&nd); 95 if (error) 96 warn("ioctl(SIOCSIFINFO_IN6)"); 97 } 98 99 void 100 setnd6defif(if_ctx *ctx, const char *dummyaddr __unused, int d) 101 { 102 struct in6_ndifreq ndifreq = {}; 103 int ifindex; 104 int error; 105 106 strlcpy(ndifreq.ifname, ctx->ifname, sizeof(ndifreq.ifname)); 107 108 if (d < 0) { 109 if (isnd6defif(ctx, ctx->io_s)) { 110 /* ifindex = 0 means to remove default if */ 111 ifindex = 0; 112 } else 113 return; 114 } else if ((ifindex = if_nametoindex(ndifreq.ifname)) == 0) { 115 warn("if_nametoindex(%s)", ndifreq.ifname); 116 return; 117 } 118 119 ndifreq.ifindex = ifindex; 120 error = ioctl_ctx(ctx, SIOCSDEFIFACE_IN6, (caddr_t)&ndifreq); 121 if (error) 122 warn("ioctl(SIOCSDEFIFACE_IN6)"); 123 } 124 125 static int 126 isnd6defif(if_ctx *ctx, int s) 127 { 128 struct in6_ndifreq ndifreq = {}; 129 unsigned int ifindex; 130 int error; 131 132 strlcpy(ndifreq.ifname, ctx->ifname, sizeof(ndifreq.ifname)); 133 134 ifindex = if_nametoindex(ndifreq.ifname); 135 error = ioctl(s, SIOCGDEFIFACE_IN6, (caddr_t)&ndifreq); 136 if (error) { 137 warn("ioctl(SIOCGDEFIFACE_IN6)"); 138 return (error); 139 } 140 return (ndifreq.ifindex == ifindex); 141 } 142 143 void 144 nd6_status(if_ctx *ctx) 145 { 146 struct in6_ndireq nd = {}; 147 int s6; 148 int error; 149 int isdefif; 150 uint32_t bits; 151 152 strlcpy(nd.ifname, ctx->ifname, sizeof(nd.ifname)); 153 if ((s6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 154 if (errno != EAFNOSUPPORT && errno != EPROTONOSUPPORT) 155 warn("socket(AF_INET6, SOCK_DGRAM)"); 156 return; 157 } 158 error = ioctl(s6, SIOCGIFINFO_IN6, &nd); 159 if (error) { 160 if (errno != EPFNOSUPPORT) 161 warn("ioctl(SIOCGIFINFO_IN6)"); 162 close(s6); 163 return; 164 } 165 isdefif = isnd6defif(ctx, s6); 166 close(s6); 167 if (nd.ndi.flags == 0 && !isdefif) 168 return; 169 bits = (nd.ndi.flags | (isdefif << 15)); 170 printf("\tnd6 options=%x", bits); 171 print_bits("options", &bits, 1, ND6BITS, nitems(ND6BITS)); 172 putchar('\n'); 173 } 174