1 /* 2 * dhcpcd - DHCP client daemon 3 * Copyright (c) 2006-2010 Roy Marples <roy@marples.name> 4 * 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 AUTHOR 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 AUTHOR 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/ioctl.h> 29 #include <sys/param.h> 30 #include <sys/socket.h> 31 #include <sys/stat.h> 32 #include <sys/sysctl.h> 33 #include <sys/types.h> 34 35 #include <arpa/inet.h> 36 #include <net/if.h> 37 #include <net/if_dl.h> 38 #include <net/route.h> 39 #include <netinet/in.h> 40 #ifdef __DragonFly__ 41 # include <netproto/802_11/ieee80211_ioctl.h> 42 #elif __APPLE__ 43 /* FIXME: Add apple includes so we can work out SSID */ 44 #else 45 # include <net80211/ieee80211_ioctl.h> 46 #endif 47 48 #include <errno.h> 49 #include <fnmatch.h> 50 #include <stddef.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 56 #include <rump/rump.h> 57 #include <rump/rump_syscalls.h> 58 59 #include "common.h" 60 #include "configure.h" 61 #include "dhcp.h" 62 #include "if-options.h" 63 #include "net.h" 64 65 /* FIXME: Why do we need to check for sa_family 255 */ 66 #define COPYOUT(sin, sa) \ 67 sin.s_addr = ((sa) != NULL) ? \ 68 (((struct sockaddr_in *)(void *)sa)->sin_addr).s_addr : 0 69 70 static int r_fd = -1; 71 72 int 73 if_init(_unused struct interface *iface) 74 { 75 /* BSD promotes secondary address by default */ 76 return 0; 77 } 78 79 int 80 if_conf(_unused struct interface *iface) 81 { 82 /* No extra checks needed on BSD */ 83 return 0; 84 } 85 86 int 87 init_sockets(void) 88 { 89 90 if ((socket_afnet = rump_sys_socket(AF_INET, SOCK_DGRAM, 0)) == -1) 91 return -1; 92 if ((r_fd = rump_sys_socket(PF_ROUTE, SOCK_RAW, 0)) == -1) 93 return -1; 94 return 0; 95 } 96 97 int 98 getifssid(const char *ifname, char *ssid) 99 { 100 int retval = -1; 101 #if defined(SIOCG80211NWID) 102 struct ifreq ifr; 103 struct ieee80211_nwid nwid; 104 #elif defined(IEEE80211_IOC_SSID) 105 struct ieee80211req ireq; 106 char nwid[IEEE80211_NWID_LEN + 1]; 107 #endif 108 109 #if defined(SIOCG80211NWID) /* NetBSD */ 110 memset(&ifr, 0, sizeof(ifr)); 111 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); 112 memset(&nwid, 0, sizeof(nwid)); 113 ifr.ifr_data = (void *)&nwid; 114 if (rump_sys_ioctl(socket_afnet, SIOCG80211NWID, &ifr) == 0) { 115 retval = nwid.i_len; 116 memcpy(ssid, nwid.i_nwid, nwid.i_len); 117 ssid[nwid.i_len] = '\0'; 118 } 119 #elif defined(IEEE80211_IOC_SSID) /* FreeBSD */ 120 memset(&ireq, 0, sizeof(ireq)); 121 strlcpy(ireq.i_name, ifname, sizeof(ireq.i_name)); 122 ireq.i_type = IEEE80211_IOC_SSID; 123 ireq.i_val = -1; 124 ireq.i_data = &nwid; 125 if (rump_sys_ioctl(socket_afnet, SIOCG80211, &ireq) == 0) { 126 retval = ireq.i_len; 127 memcpy(ssid, nwid, ireq.i_len); 128 ssid[ireq.i_len] = '\0'; 129 } 130 #endif 131 return retval; 132 } 133 134 int 135 if_address(const struct interface *iface, const struct in_addr *address, 136 const struct in_addr *netmask, const struct in_addr *broadcast, 137 int action) 138 { 139 int retval; 140 struct ifaliasreq ifa; 141 union { 142 struct sockaddr *sa; 143 struct sockaddr_in *sin; 144 } _s; 145 146 memset(&ifa, 0, sizeof(ifa)); 147 strlcpy(ifa.ifra_name, iface->name, sizeof(ifa.ifra_name)); 148 149 #define ADDADDR(_var, _addr) { \ 150 _s.sa = &_var; \ 151 _s.sin->sin_family = AF_INET; \ 152 _s.sin->sin_len = sizeof(*_s.sin); \ 153 memcpy(&_s.sin->sin_addr, _addr, sizeof(_s.sin->sin_addr)); \ 154 } 155 156 ADDADDR(ifa.ifra_addr, address); 157 ADDADDR(ifa.ifra_mask, netmask); 158 if (action >= 0 && broadcast) { 159 ADDADDR(ifa.ifra_broadaddr, broadcast); 160 } 161 #undef ADDADDR 162 163 if (action < 0) 164 retval = rump_sys_ioctl(socket_afnet, SIOCDIFADDR, &ifa); 165 else 166 retval = rump_sys_ioctl(socket_afnet, SIOCAIFADDR, &ifa); 167 return retval; 168 } 169 170 /* ARGSUSED4 */ 171 int 172 if_route(const struct interface *iface, const struct in_addr *dest, 173 const struct in_addr *net, const struct in_addr *gate, 174 _unused int metric, int action) 175 { 176 union sockunion { 177 struct sockaddr sa; 178 struct sockaddr_in sin; 179 #ifdef INET6 180 struct sockaddr_in6 sin6; 181 #endif 182 struct sockaddr_dl sdl; 183 struct sockaddr_storage ss; 184 } su; 185 struct rtm 186 { 187 struct rt_msghdr hdr; 188 char buffer[sizeof(su) * 4]; 189 } rtm; 190 char *bp = rtm.buffer, *p; 191 size_t l; 192 int retval = 0; 193 194 #define ADDSU(_su) { \ 195 l = RT_ROUNDUP(_su.sa.sa_len); \ 196 memcpy(bp, &(_su), l); \ 197 bp += l; \ 198 } 199 #define ADDADDR(_a) { \ 200 memset (&su, 0, sizeof(su)); \ 201 su.sin.sin_family = AF_INET; \ 202 su.sin.sin_len = sizeof(su.sin); \ 203 memcpy (&su.sin.sin_addr, _a, sizeof(su.sin.sin_addr)); \ 204 ADDSU(su); \ 205 } 206 207 memset(&rtm, 0, sizeof(rtm)); 208 rtm.hdr.rtm_version = RTM_VERSION; 209 rtm.hdr.rtm_seq = 1; 210 if (action == 0) 211 rtm.hdr.rtm_type = RTM_CHANGE; 212 else if (action > 0) 213 rtm.hdr.rtm_type = RTM_ADD; 214 else 215 rtm.hdr.rtm_type = RTM_DELETE; 216 rtm.hdr.rtm_flags = RTF_UP; 217 /* None interface subnet routes are static. */ 218 if (gate->s_addr != INADDR_ANY || 219 net->s_addr != iface->net.s_addr || 220 dest->s_addr != (iface->addr.s_addr & iface->net.s_addr)) 221 rtm.hdr.rtm_flags |= RTF_STATIC; 222 rtm.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY; 223 if (dest->s_addr == gate->s_addr && net->s_addr == INADDR_BROADCAST) 224 rtm.hdr.rtm_flags |= RTF_HOST; 225 else { 226 rtm.hdr.rtm_addrs |= RTA_NETMASK; 227 if (rtm.hdr.rtm_flags & RTF_STATIC) 228 rtm.hdr.rtm_flags |= RTF_GATEWAY; 229 if (action >= 0) 230 rtm.hdr.rtm_addrs |= RTA_IFA; 231 } 232 233 ADDADDR(dest); 234 if (rtm.hdr.rtm_flags & RTF_HOST || 235 !(rtm.hdr.rtm_flags & RTF_STATIC)) 236 { 237 /* Make us a link layer socket for the host gateway */ 238 memset(&su, 0, sizeof(su)); 239 su.sdl.sdl_len = sizeof(struct sockaddr_dl); 240 link_addr(iface->name, &su.sdl); 241 ADDSU(su); 242 } else 243 ADDADDR(gate); 244 245 if (rtm.hdr.rtm_addrs & RTA_NETMASK) { 246 /* Ensure that netmask is set correctly */ 247 memset(&su, 0, sizeof(su)); 248 su.sin.sin_family = AF_INET; 249 su.sin.sin_len = sizeof(su.sin); 250 memcpy(&su.sin.sin_addr, &net->s_addr, sizeof(su.sin.sin_addr)); 251 p = su.sa.sa_len + (char *)&su; 252 for (su.sa.sa_len = 0; p > (char *)&su;) 253 if (*--p != 0) { 254 su.sa.sa_len = 1 + p - (char *)&su; 255 break; 256 } 257 ADDSU(su); 258 } 259 260 if (rtm.hdr.rtm_addrs & RTA_IFA) 261 ADDADDR(&iface->addr); 262 263 rtm.hdr.rtm_msglen = l = bp - (char *)&rtm; 264 if (rump_sys_write(r_fd, &rtm, l) == -1) 265 retval = -1; 266 return retval; 267 } 268