1 | /* |
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2 | * dhcpcd - DHCP client daemon |
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3 | * Copyright (c) 2006-2013 Roy Marples <roy@marples.name> |
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4 | * All rights reserved |
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5 | |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions |
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8 | * are met: |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * 2. Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * |
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15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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16 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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17 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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18 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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19 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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20 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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21 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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22 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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23 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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24 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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25 | * SUCH DAMAGE. |
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26 | */ |
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27 | |
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28 | #include <sys/ioctl.h> |
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29 | #include <sys/param.h> |
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30 | #include <sys/socket.h> |
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31 | #include <sys/stat.h> |
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32 | #include <sys/sysctl.h> |
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33 | #include <sys/types.h> |
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34 | |
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35 | #include <arpa/inet.h> |
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36 | #include <net/if.h> |
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37 | #include <net/if_dl.h> |
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38 | #ifdef __FreeBSD__ /* Needed so that including netinet6/in6_var.h works */ |
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39 | # include <net/if_var.h> |
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40 | #endif |
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41 | #include <net/if_media.h> |
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42 | #include <net/route.h> |
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43 | #include <netinet/in.h> |
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44 | #include <netinet6/in6_var.h> |
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45 | #ifdef __DragonFly__ |
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46 | # include <netproto/802_11/ieee80211_ioctl.h> |
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47 | #elif __APPLE__ |
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48 | /* FIXME: Add apple includes so we can work out SSID */ |
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49 | #else |
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50 | # include <net80211/ieee80211_ioctl.h> |
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51 | #endif |
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52 | |
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53 | #include <errno.h> |
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54 | #include <fnmatch.h> |
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55 | #include <stddef.h> |
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56 | #include <stdio.h> |
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57 | #include <stdlib.h> |
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58 | #include <string.h> |
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59 | #include <syslog.h> |
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60 | #include <unistd.h> |
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61 | |
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62 | #include "config.h" |
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63 | #include "common.h" |
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64 | #include "dhcp.h" |
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65 | #include "if-options.h" |
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66 | #include "ipv4.h" |
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67 | #include "ipv6.h" |
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68 | |
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69 | #ifndef RT_ROUNDUP |
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70 | #define RT_ROUNDUP(a) \ |
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71 | ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) |
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72 | #define RT_ADVANCE(x, n) (x += RT_ROUNDUP((n)->sa_len)) |
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73 | #endif |
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74 | |
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75 | #define COPYOUT(sin, sa) \ |
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76 | sin.s_addr = ((sa) != NULL) ? \ |
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77 | (((struct sockaddr_in *)(void *)sa)->sin_addr).s_addr : 0 |
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78 | |
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79 | #define COPYOUT6(sin, sa) \ |
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80 | sin.s6_addr = ((sa) != NULL) ? \ |
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81 | (((struct sockaddr_in6 *)(void *)sa)->sin6_addr).s6_addr : 0 |
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82 | |
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83 | #ifndef CLLADDR |
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84 | # define CLLADDR(s) ((const char *)((s)->sdl_data + (s)->sdl_nlen)) |
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85 | #endif |
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86 | |
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87 | static int r_fd = -1; |
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88 | static char *link_buf; |
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89 | static ssize_t link_buflen; |
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90 | |
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91 | int |
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92 | if_init(__unused struct interface *iface) |
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93 | { |
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94 | /* BSD promotes secondary address by default */ |
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95 | return 0; |
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96 | } |
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97 | |
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98 | int |
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99 | if_conf(__unused struct interface *iface) |
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100 | { |
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101 | /* No extra checks needed on BSD */ |
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102 | return 0; |
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103 | } |
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104 | |
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105 | #ifdef DEBUG_MEMORY |
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106 | static void |
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107 | cleanup(void) |
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108 | { |
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109 | |
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110 | free(link_buf); |
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111 | } |
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112 | #endif |
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113 | |
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114 | int |
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115 | open_sockets(void) |
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116 | { |
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117 | if ((socket_afnet = socket(AF_INET, SOCK_DGRAM, 0)) == -1) |
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118 | return -1; |
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119 | set_cloexec(socket_afnet); |
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120 | if ((r_fd = socket(PF_ROUTE, SOCK_RAW, 0)) == -1) |
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121 | return -1; |
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122 | set_cloexec(r_fd); |
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123 | return 0; |
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124 | } |
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125 | |
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126 | int |
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127 | open_link_socket(void) |
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128 | { |
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129 | int fd; |
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130 | |
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131 | #ifdef DEBUG_MEMORY |
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132 | if (link_buf == NULL) |
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133 | atexit(cleanup); |
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134 | #endif |
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135 | |
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136 | fd = socket(PF_ROUTE, SOCK_RAW, 0); |
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137 | if (fd != -1) { |
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138 | set_cloexec(fd); |
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139 | set_nonblock(fd); |
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140 | } |
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141 | return fd; |
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142 | } |
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143 | |
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144 | int |
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145 | getifssid(const char *ifname, char *ssid) |
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146 | { |
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147 | int retval = -1; |
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148 | #if defined(SIOCG80211NWID) |
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149 | struct ifreq ifr; |
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150 | struct ieee80211_nwid nwid; |
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151 | #elif defined(IEEE80211_IOC_SSID) |
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152 | struct ieee80211req ireq; |
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153 | char nwid[IEEE80211_NWID_LEN + 1]; |
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154 | #endif |
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155 | |
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156 | #if defined(SIOCG80211NWID) /* NetBSD */ |
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157 | memset(&ifr, 0, sizeof(ifr)); |
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158 | strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); |
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159 | memset(&nwid, 0, sizeof(nwid)); |
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160 | ifr.ifr_data = (void *)&nwid; |
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161 | if (ioctl(socket_afnet, SIOCG80211NWID, &ifr) == 0) { |
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162 | retval = nwid.i_len; |
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163 | if (ssid) { |
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164 | memcpy(ssid, nwid.i_nwid, nwid.i_len); |
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165 | ssid[nwid.i_len] = '\0'; |
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166 | } |
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167 | } |
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168 | #elif defined(IEEE80211_IOC_SSID) /* FreeBSD */ |
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169 | memset(&ireq, 0, sizeof(ireq)); |
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170 | strlcpy(ireq.i_name, ifname, sizeof(ireq.i_name)); |
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171 | ireq.i_type = IEEE80211_IOC_SSID; |
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172 | ireq.i_val = -1; |
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173 | memset(nwid, 0, sizeof(nwid)); |
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174 | ireq.i_data = &nwid; |
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175 | if (ioctl(socket_afnet, SIOCG80211, &ireq) == 0) { |
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176 | retval = ireq.i_len; |
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177 | if (ssid) { |
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178 | memcpy(ssid, nwid, ireq.i_len); |
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179 | ssid[ireq.i_len] = '\0'; |
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180 | } |
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181 | } |
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182 | #endif |
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183 | return retval; |
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184 | } |
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185 | |
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186 | /* |
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187 | * FreeBSD allows for Virtual Access Points |
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188 | * We need to check if the interface is a Virtual Interface Master |
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189 | * and if so, don't use it. |
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190 | * This check is made by virtue of being a IEEE80211 device but |
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191 | * returning the SSID gives an error. |
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192 | */ |
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193 | int |
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194 | if_vimaster(const char *ifname) |
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195 | { |
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196 | struct ifmediareq ifmr; |
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197 | |
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198 | memset(&ifmr, 0, sizeof(ifmr)); |
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199 | strlcpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name)); |
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200 | if (ioctl(socket_afnet, SIOCGIFMEDIA, &ifmr) == -1) |
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201 | return -1; |
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202 | if (ifmr.ifm_status & IFM_AVALID && |
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203 | IFM_TYPE(ifmr.ifm_active) == IFM_IEEE80211) |
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204 | { |
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205 | if (getifssid(ifname, NULL) == -1) |
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206 | return 1; |
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207 | } |
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208 | return 0; |
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209 | } |
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210 | |
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211 | #ifdef INET |
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212 | int |
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213 | if_address(const struct interface *iface, const struct in_addr *address, |
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214 | const struct in_addr *netmask, const struct in_addr *broadcast, |
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215 | int action) |
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216 | { |
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217 | struct ifaliasreq ifa; |
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218 | union { |
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219 | struct sockaddr *sa; |
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220 | struct sockaddr_in *sin; |
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221 | } _s; |
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222 | |
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223 | memset(&ifa, 0, sizeof(ifa)); |
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224 | strlcpy(ifa.ifra_name, iface->name, sizeof(ifa.ifra_name)); |
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225 | |
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226 | #define ADDADDR(_var, _addr) { \ |
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227 | _s.sa = &_var; \ |
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228 | _s.sin->sin_family = AF_INET; \ |
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229 | _s.sin->sin_len = sizeof(*_s.sin); \ |
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230 | memcpy(&_s.sin->sin_addr, _addr, sizeof(_s.sin->sin_addr)); \ |
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231 | } |
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232 | |
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233 | ADDADDR(ifa.ifra_addr, address); |
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234 | ADDADDR(ifa.ifra_mask, netmask); |
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235 | if (action >= 0 && broadcast) { |
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236 | ADDADDR(ifa.ifra_broadaddr, broadcast); |
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237 | } |
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238 | #undef ADDADDR |
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239 | |
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240 | return ioctl(socket_afnet, |
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241 | action < 0 ? SIOCDIFADDR : |
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242 | action == 2 ? SIOCSIFADDR : SIOCAIFADDR, &ifa); |
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243 | } |
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244 | |
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245 | int |
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246 | if_route(const struct rt *rt, int action) |
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247 | { |
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248 | const struct dhcp_state *state; |
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249 | union sockunion { |
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250 | struct sockaddr sa; |
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251 | struct sockaddr_in sin; |
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252 | struct sockaddr_dl sdl; |
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253 | struct sockaddr_storage ss; |
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254 | } su; |
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255 | struct rtm |
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256 | { |
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257 | struct rt_msghdr hdr; |
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258 | char buffer[sizeof(su) * 4]; |
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259 | } rtm; |
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260 | char *bp = rtm.buffer; |
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261 | size_t l; |
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262 | int retval = 0; |
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263 | |
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264 | #define ADDSU { \ |
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265 | l = RT_ROUNDUP(su.sa.sa_len); \ |
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266 | memcpy(bp, &su, l); \ |
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267 | bp += l; \ |
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268 | } |
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269 | #define ADDADDR(addr) { \ |
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270 | memset(&su, 0, sizeof(su)); \ |
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271 | su.sin.sin_family = AF_INET; \ |
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272 | su.sin.sin_len = sizeof(su.sin); \ |
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273 | (&su.sin)->sin_addr = *addr; \ |
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274 | ADDSU; \ |
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275 | } |
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276 | |
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277 | state = D_CSTATE(rt->iface); |
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278 | memset(&rtm, 0, sizeof(rtm)); |
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279 | rtm.hdr.rtm_version = RTM_VERSION; |
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280 | rtm.hdr.rtm_seq = 1; |
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281 | if (action == 0) |
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282 | rtm.hdr.rtm_type = RTM_CHANGE; |
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283 | else if (action > 0) |
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284 | rtm.hdr.rtm_type = RTM_ADD; |
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285 | else |
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286 | rtm.hdr.rtm_type = RTM_DELETE; |
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287 | rtm.hdr.rtm_flags = RTF_UP; |
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288 | /* None interface subnet routes are static. */ |
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289 | if (rt->gate.s_addr != INADDR_ANY || |
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290 | rt->net.s_addr != state->net.s_addr || |
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291 | rt->dest.s_addr != (state->addr.s_addr & state->net.s_addr)) |
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292 | rtm.hdr.rtm_flags |= RTF_STATIC; |
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293 | rtm.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY; |
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294 | if (rt->dest.s_addr == rt->gate.s_addr && |
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295 | rt->net.s_addr == INADDR_BROADCAST) |
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296 | rtm.hdr.rtm_flags |= RTF_HOST; |
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297 | else if (rt->gate.s_addr == htonl(INADDR_LOOPBACK) && |
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298 | rt->net.s_addr == INADDR_BROADCAST) |
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299 | rtm.hdr.rtm_flags |= RTF_HOST | RTF_GATEWAY; |
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300 | else { |
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301 | rtm.hdr.rtm_addrs |= RTA_NETMASK; |
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302 | if (rtm.hdr.rtm_flags & RTF_STATIC) |
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303 | rtm.hdr.rtm_flags |= RTF_GATEWAY; |
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304 | if (action >= 0) |
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305 | rtm.hdr.rtm_addrs |= RTA_IFA; |
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306 | } |
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307 | |
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308 | ADDADDR(&rt->dest); |
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309 | if ((rtm.hdr.rtm_flags & RTF_HOST && |
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310 | rt->gate.s_addr != htonl(INADDR_LOOPBACK)) || |
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311 | !(rtm.hdr.rtm_flags & RTF_STATIC)) |
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312 | { |
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313 | /* Make us a link layer socket for the host gateway */ |
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314 | memset(&su, 0, sizeof(su)); |
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315 | su.sdl.sdl_len = sizeof(struct sockaddr_dl); |
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316 | link_addr(rt->iface->name, &su.sdl); |
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317 | ADDSU; |
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318 | } else |
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319 | ADDADDR(&rt->gate); |
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320 | |
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321 | if (rtm.hdr.rtm_addrs & RTA_NETMASK) |
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322 | ADDADDR(&rt->net); |
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323 | |
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324 | if (rtm.hdr.rtm_addrs & RTA_IFP) { |
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325 | /* Make us a link layer socket for the host gateway */ |
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326 | memset(&su, 0, sizeof(su)); |
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327 | su.sdl.sdl_len = sizeof(struct sockaddr_dl); |
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328 | link_addr(rt->iface->name, &su.sdl); |
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329 | ADDSU; |
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330 | } |
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331 | |
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332 | if (rtm.hdr.rtm_addrs & RTA_IFA) |
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333 | ADDADDR(&state->addr); |
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334 | |
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335 | #undef ADDADDR |
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336 | #undef ADDSU |
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337 | |
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338 | rtm.hdr.rtm_msglen = l = bp - (char *)&rtm; |
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339 | if (write(r_fd, &rtm, l) == -1) |
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340 | retval = -1; |
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341 | return retval; |
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342 | } |
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343 | #endif |
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344 | |
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345 | #ifdef INET6 |
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346 | int |
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347 | if_address6(const struct ipv6_addr *a, int action) |
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348 | { |
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349 | int s, r; |
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350 | struct in6_aliasreq ifa; |
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351 | struct in6_addr mask; |
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352 | |
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353 | s = socket(AF_INET6, SOCK_DGRAM, 0); |
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354 | if (s == -1) |
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355 | return -1; |
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356 | memset(&ifa, 0, sizeof(ifa)); |
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357 | strlcpy(ifa.ifra_name, a->iface->name, sizeof(ifa.ifra_name)); |
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358 | /* |
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359 | * We should not set IN6_IFF_TENTATIVE as the kernel should be |
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360 | * able to work out if it's a new address or not. |
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361 | * |
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362 | * We should set IN6_IFF_AUTOCONF, but the kernel won't let us. |
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363 | * This is probably a safety measure, but still it's not entirely right |
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364 | * either. |
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365 | */ |
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366 | #if 0 |
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367 | if (a->autoconf) |
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368 | ifa.ifra_flags |= IN6_IFF_AUTOCONF; |
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369 | #endif |
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370 | |
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371 | #define ADDADDR(v, addr) { \ |
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372 | (v)->sin6_family = AF_INET6; \ |
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373 | (v)->sin6_len = sizeof(*v); \ |
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374 | (v)->sin6_addr = *addr; \ |
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375 | } |
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376 | |
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377 | ADDADDR(&ifa.ifra_addr, &a->addr); |
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378 | ipv6_mask(&mask, a->prefix_len); |
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379 | ADDADDR(&ifa.ifra_prefixmask, &mask); |
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380 | ifa.ifra_lifetime.ia6t_vltime = a->prefix_vltime; |
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381 | ifa.ifra_lifetime.ia6t_pltime = a->prefix_pltime; |
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382 | #undef ADDADDR |
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383 | |
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384 | r = ioctl(s, action < 0 ? SIOCDIFADDR_IN6 : SIOCAIFADDR_IN6, &ifa); |
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385 | close(s); |
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386 | return r; |
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387 | } |
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388 | |
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389 | int |
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390 | if_route6(const struct rt6 *rt, int action) |
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391 | { |
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392 | union sockunion { |
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393 | struct sockaddr sa; |
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394 | struct sockaddr_in6 sin; |
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395 | struct sockaddr_dl sdl; |
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396 | struct sockaddr_storage ss; |
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397 | } su; |
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398 | struct rtm |
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399 | { |
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400 | struct rt_msghdr hdr; |
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401 | char buffer[sizeof(su) * 4]; |
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402 | } rtm; |
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403 | char *bp = rtm.buffer; |
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404 | size_t l; |
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405 | int retval = 0; |
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406 | const struct ipv6_addr_l *lla; |
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407 | |
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408 | /* KAME based systems want to store the scope inside the sin6_addr |
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409 | * for link local addreses */ |
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410 | #ifdef __KAME__ |
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411 | #define SCOPE { \ |
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412 | if (IN6_IS_ADDR_LINKLOCAL(&su.sin.sin6_addr)) { \ |
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413 | uint16_t scope = htons(su.sin.sin6_scope_id); \ |
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414 | memcpy(&su.sin.sin6_addr.s6_addr[2], &scope, \ |
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415 | sizeof(scope)); \ |
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416 | su.sin.sin6_scope_id = 0; \ |
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417 | } \ |
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418 | } |
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419 | #else |
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420 | #define SCOPE |
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421 | #endif |
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422 | |
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423 | #define ADDSU { \ |
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424 | l = RT_ROUNDUP(su.sa.sa_len); \ |
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425 | memcpy(bp, &su, l); \ |
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426 | bp += l; \ |
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427 | } |
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428 | #define ADDADDRS(addr, scope) { \ |
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429 | memset(&su, 0, sizeof(su)); \ |
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430 | su.sin.sin6_family = AF_INET6; \ |
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431 | su.sin.sin6_len = sizeof(su.sin); \ |
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432 | (&su.sin)->sin6_addr = *addr; \ |
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433 | su.sin.sin6_scope_id = scope; \ |
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434 | SCOPE; \ |
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435 | ADDSU; \ |
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436 | } |
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437 | #define ADDADDR(addr) ADDADDRS(addr, 0) |
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438 | |
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439 | memset(&rtm, 0, sizeof(rtm)); |
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440 | rtm.hdr.rtm_version = RTM_VERSION; |
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441 | rtm.hdr.rtm_seq = 1; |
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442 | if (action == 0) |
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443 | rtm.hdr.rtm_type = RTM_CHANGE; |
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444 | else if (action > 0) |
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445 | rtm.hdr.rtm_type = RTM_ADD; |
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446 | else |
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447 | rtm.hdr.rtm_type = RTM_DELETE; |
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448 | |
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449 | rtm.hdr.rtm_flags = RTF_UP; |
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450 | /* None interface subnet routes are static. */ |
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451 | if (IN6_IS_ADDR_UNSPECIFIED(&rt->dest) && |
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452 | IN6_IS_ADDR_UNSPECIFIED(&rt->net)) |
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453 | rtm.hdr.rtm_flags |= RTF_GATEWAY; |
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454 | #ifdef RTF_CLONING |
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455 | else |
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456 | rtm.hdr.rtm_flags |= RTF_CLONING; |
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457 | #endif |
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458 | |
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459 | rtm.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK; |
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460 | if (action >= 0) |
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461 | rtm.hdr.rtm_addrs |= RTA_IFP | RTA_IFA; |
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462 | |
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463 | ADDADDR(&rt->dest); |
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464 | if (!(rtm.hdr.rtm_flags & RTF_GATEWAY)) { |
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465 | lla = ipv6_linklocal(rt->iface); |
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466 | if (lla == NULL) /* unlikely as we need a LL to get here */ |
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467 | return -1; |
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468 | ADDADDRS(&lla->addr, rt->iface->index); |
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469 | } else { |
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470 | lla = NULL; |
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471 | ADDADDRS(&rt->gate, rt->iface->index); |
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472 | } |
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473 | |
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474 | if (rtm.hdr.rtm_addrs & RTA_NETMASK) { |
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475 | if (rtm.hdr.rtm_flags & RTF_GATEWAY) { |
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476 | memset(&su, 0, sizeof(su)); |
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477 | su.sin.sin6_family = AF_INET6; |
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478 | ADDSU; |
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479 | } else |
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480 | ADDADDR(&rt->net); |
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481 | } |
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482 | |
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483 | if (rtm.hdr.rtm_addrs & RTA_IFP) { |
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484 | /* Make us a link layer socket for the host gateway */ |
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485 | memset(&su, 0, sizeof(su)); |
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486 | su.sdl.sdl_len = sizeof(struct sockaddr_dl); |
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487 | link_addr(rt->iface->name, &su.sdl); |
---|
488 | ADDSU; |
---|
489 | } |
---|
490 | |
---|
491 | if (rtm.hdr.rtm_addrs & RTA_IFA) { |
---|
492 | if (lla == NULL) { |
---|
493 | lla = ipv6_linklocal(rt->iface); |
---|
494 | if (lla == NULL) /* unlikely */ |
---|
495 | return -1; |
---|
496 | } |
---|
497 | ADDADDRS(&lla->addr, rt->iface->index); |
---|
498 | } |
---|
499 | |
---|
500 | #undef ADDADDR |
---|
501 | #undef ADDSU |
---|
502 | #undef SCOPE |
---|
503 | |
---|
504 | if (action >= 0 && rt->mtu) { |
---|
505 | rtm.hdr.rtm_inits |= RTV_MTU; |
---|
506 | rtm.hdr.rtm_rmx.rmx_mtu = rt->mtu; |
---|
507 | } |
---|
508 | |
---|
509 | rtm.hdr.rtm_msglen = l = bp - (char *)&rtm; |
---|
510 | if (write(r_fd, &rtm, l) == -1) |
---|
511 | retval = -1; |
---|
512 | return retval; |
---|
513 | } |
---|
514 | #endif |
---|
515 | |
---|
516 | static void |
---|
517 | get_addrs(int type, char *cp, struct sockaddr **sa) |
---|
518 | { |
---|
519 | int i; |
---|
520 | |
---|
521 | for (i = 0; i < RTAX_MAX; i++) { |
---|
522 | if (type & (1 << i)) { |
---|
523 | sa[i] = (struct sockaddr *)cp; |
---|
524 | #ifdef DEBUG |
---|
525 | printf ("got %d %d %s\n", i, sa[i]->sa_family, |
---|
526 | inet_ntoa(((struct sockaddr_in *)sa[i])-> |
---|
527 | sin_addr)); |
---|
528 | #endif |
---|
529 | RT_ADVANCE(cp, sa[i]); |
---|
530 | } else |
---|
531 | sa[i] = NULL; |
---|
532 | } |
---|
533 | } |
---|
534 | |
---|
535 | #ifdef INET6 |
---|
536 | int |
---|
537 | in6_addr_flags(const char *ifname, const struct in6_addr *addr) |
---|
538 | { |
---|
539 | int s, flags; |
---|
540 | struct in6_ifreq ifr6; |
---|
541 | |
---|
542 | s = socket(AF_INET6, SOCK_DGRAM, 0); |
---|
543 | flags = -1; |
---|
544 | if (s != -1) { |
---|
545 | memset(&ifr6, 0, sizeof(ifr6)); |
---|
546 | strncpy(ifr6.ifr_name, ifname, sizeof(ifr6.ifr_name)); |
---|
547 | ifr6.ifr_addr.sin6_family = AF_INET6; |
---|
548 | ifr6.ifr_addr.sin6_addr = *addr; |
---|
549 | if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) != -1) |
---|
550 | flags = ifr6.ifr_ifru.ifru_flags6; |
---|
551 | close(s); |
---|
552 | } |
---|
553 | return flags; |
---|
554 | } |
---|
555 | #endif |
---|
556 | |
---|
557 | int |
---|
558 | manage_link(int fd) |
---|
559 | { |
---|
560 | char *p, *e, *cp; |
---|
561 | char ifname[IF_NAMESIZE]; |
---|
562 | ssize_t bytes; |
---|
563 | struct rt_msghdr *rtm; |
---|
564 | struct if_announcemsghdr *ifan; |
---|
565 | struct if_msghdr *ifm; |
---|
566 | struct ifa_msghdr *ifam; |
---|
567 | struct sockaddr *sa, *rti_info[RTAX_MAX]; |
---|
568 | int len; |
---|
569 | struct sockaddr_dl sdl; |
---|
570 | #ifdef INET |
---|
571 | struct rt rt; |
---|
572 | #endif |
---|
573 | #if defined(INET6) && !defined(LISTEN_DAD) |
---|
574 | struct in6_addr ia6; |
---|
575 | struct sockaddr_in6 *sin6; |
---|
576 | int ifa_flags; |
---|
577 | #endif |
---|
578 | |
---|
579 | for (;;) { |
---|
580 | if (ioctl(fd, FIONREAD, &len) == -1) |
---|
581 | return -1; |
---|
582 | if (link_buflen < len) { |
---|
583 | p = realloc(link_buf, len); |
---|
584 | if (p == NULL) |
---|
585 | return -1; |
---|
586 | link_buf = p; |
---|
587 | link_buflen = len; |
---|
588 | } |
---|
589 | bytes = read(fd, link_buf, link_buflen); |
---|
590 | if (bytes == -1) { |
---|
591 | if (errno == EAGAIN) |
---|
592 | return 0; |
---|
593 | if (errno == EINTR) |
---|
594 | continue; |
---|
595 | return -1; |
---|
596 | } |
---|
597 | e = link_buf + bytes; |
---|
598 | for (p = link_buf; p < e; p += rtm->rtm_msglen) { |
---|
599 | rtm = (struct rt_msghdr *)(void *)p; |
---|
600 | // Ignore messages generated by us |
---|
601 | if (rtm->rtm_pid == getpid()) |
---|
602 | break; |
---|
603 | switch(rtm->rtm_type) { |
---|
604 | #ifdef RTM_IFANNOUNCE |
---|
605 | case RTM_IFANNOUNCE: |
---|
606 | ifan = (struct if_announcemsghdr *)(void *)p; |
---|
607 | switch(ifan->ifan_what) { |
---|
608 | case IFAN_ARRIVAL: |
---|
609 | handle_interface(1, ifan->ifan_name); |
---|
610 | break; |
---|
611 | case IFAN_DEPARTURE: |
---|
612 | handle_interface(-1, ifan->ifan_name); |
---|
613 | break; |
---|
614 | } |
---|
615 | break; |
---|
616 | #endif |
---|
617 | case RTM_IFINFO: |
---|
618 | ifm = (struct if_msghdr *)(void *)p; |
---|
619 | memset(ifname, 0, sizeof(ifname)); |
---|
620 | if (!(if_indextoname(ifm->ifm_index, ifname))) |
---|
621 | break; |
---|
622 | switch (ifm->ifm_data.ifi_link_state) { |
---|
623 | case LINK_STATE_DOWN: |
---|
624 | len = LINK_DOWN; |
---|
625 | break; |
---|
626 | case LINK_STATE_UP: |
---|
627 | len = LINK_UP; |
---|
628 | break; |
---|
629 | default: |
---|
630 | /* handle_carrier will re-load |
---|
631 | * the interface flags and check for |
---|
632 | * IFF_RUNNING as some drivers that |
---|
633 | * don't handle link state also don't |
---|
634 | * set IFF_RUNNING when this routing |
---|
635 | * message is generated. |
---|
636 | * As such, it is a race ...*/ |
---|
637 | len = LINK_UNKNOWN; |
---|
638 | break; |
---|
639 | } |
---|
640 | handle_carrier(len, ifm->ifm_flags, ifname); |
---|
641 | break; |
---|
642 | case RTM_DELETE: |
---|
643 | if (~rtm->rtm_addrs & |
---|
644 | (RTA_DST | RTA_GATEWAY | RTA_NETMASK)) |
---|
645 | break; |
---|
646 | cp = (char *)(void *)(rtm + 1); |
---|
647 | sa = (struct sockaddr *)(void *)cp; |
---|
648 | if (sa->sa_family != AF_INET) |
---|
649 | break; |
---|
650 | #ifdef INET |
---|
651 | get_addrs(rtm->rtm_addrs, cp, rti_info); |
---|
652 | memset(&rt, 0, sizeof(rt)); |
---|
653 | rt.iface = NULL; |
---|
654 | COPYOUT(rt.dest, rti_info[RTAX_DST]); |
---|
655 | COPYOUT(rt.net, rti_info[RTAX_NETMASK]); |
---|
656 | COPYOUT(rt.gate, rti_info[RTAX_GATEWAY]); |
---|
657 | ipv4_routedeleted(&rt); |
---|
658 | #endif |
---|
659 | break; |
---|
660 | #ifdef RTM_CHGADDR |
---|
661 | case RTM_CHGADDR: /* FALLTHROUGH */ |
---|
662 | #endif |
---|
663 | case RTM_DELADDR: /* FALLTHROUGH */ |
---|
664 | case RTM_NEWADDR: |
---|
665 | ifam = (struct ifa_msghdr *)(void *)p; |
---|
666 | if (!if_indextoname(ifam->ifam_index, ifname)) |
---|
667 | break; |
---|
668 | cp = (char *)(void *)(ifam + 1); |
---|
669 | get_addrs(ifam->ifam_addrs, cp, rti_info); |
---|
670 | if (rti_info[RTAX_IFA] == NULL) |
---|
671 | break; |
---|
672 | switch (rti_info[RTAX_IFA]->sa_family) { |
---|
673 | case AF_LINK: |
---|
674 | #ifdef RTM_CHGADDR |
---|
675 | if (rtm->rtm_type != RTM_CHGADDR) |
---|
676 | break; |
---|
677 | #else |
---|
678 | if (rtm->rtm_type != RTM_NEWADDR) |
---|
679 | break; |
---|
680 | #endif |
---|
681 | memcpy(&sdl, rti_info[RTAX_IFA], |
---|
682 | rti_info[RTAX_IFA]->sa_len); |
---|
683 | handle_hwaddr(ifname, |
---|
684 | (const unsigned char*)CLLADDR(&sdl), |
---|
685 | sdl.sdl_alen); |
---|
686 | break; |
---|
687 | #ifdef INET |
---|
688 | case AF_INET: |
---|
689 | case 255: /* FIXME: Why 255? */ |
---|
690 | COPYOUT(rt.dest, rti_info[RTAX_IFA]); |
---|
691 | COPYOUT(rt.net, rti_info[RTAX_NETMASK]); |
---|
692 | COPYOUT(rt.gate, rti_info[RTAX_BRD]); |
---|
693 | ipv4_handleifa(rtm->rtm_type, |
---|
694 | NULL, ifname, |
---|
695 | &rt.dest, &rt.net, &rt.gate); |
---|
696 | break; |
---|
697 | #endif |
---|
698 | #if defined(INET6) && !defined(LISTEN_DAD) |
---|
699 | case AF_INET6: |
---|
700 | sin6 = (struct sockaddr_in6*)(void *) |
---|
701 | rti_info[RTAX_IFA]; |
---|
702 | memcpy(ia6.s6_addr, |
---|
703 | sin6->sin6_addr.s6_addr, |
---|
704 | sizeof(ia6.s6_addr)); |
---|
705 | if (rtm->rtm_type == RTM_NEWADDR) { |
---|
706 | ifa_flags = in6_addr_flags( |
---|
707 | ifname, |
---|
708 | &ia6); |
---|
709 | if (ifa_flags == -1) |
---|
710 | break; |
---|
711 | } else |
---|
712 | ifa_flags = 0; |
---|
713 | ipv6_handleifa(rtm->rtm_type, NULL, |
---|
714 | ifname, &ia6, ifa_flags); |
---|
715 | break; |
---|
716 | #endif |
---|
717 | } |
---|
718 | break; |
---|
719 | } |
---|
720 | } |
---|
721 | } |
---|
722 | } |
---|