The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1 | /* |
| 2 | * dhcpcd - DHCP client daemon |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 3 | * Copyright (c) 2006-2011 Roy Marples <roy@marples.name> |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 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 <asm/types.h> /* Needed for 2.4 kernels */ |
| 29 | |
| 30 | #include <sys/types.h> |
| 31 | #include <sys/socket.h> |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 32 | #include <sys/ioctl.h> |
| 33 | #include <sys/param.h> |
| 34 | |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 35 | #include <linux/netlink.h> |
| 36 | #include <linux/rtnetlink.h> |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 37 | |
| 38 | /* Support older kernels */ |
| 39 | #ifndef IFLA_WIRELESS |
| 40 | # define IFLA_WIRELESS (IFLA_MASTER + 1) |
| 41 | #endif |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 42 | |
| 43 | #include <errno.h> |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 44 | #include <ctype.h> |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 45 | #include <stddef.h> |
| 46 | #include <stdio.h> |
| 47 | #include <stdlib.h> |
| 48 | #include <string.h> |
| 49 | #include <unistd.h> |
| 50 | |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 51 | #include "config.h" |
| 52 | #include "common.h" |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 53 | #include "configure.h" |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 54 | #include "dhcp.h" |
| 55 | #include "net.h" |
| 56 | |
Christopher Ferris | 0c9f91e | 2014-09-03 20:17:53 -0700 | [diff] [blame] | 57 | /* ANDROID change, moved this below all includes. */ |
| 58 | /* For some reason, glibc doesn't include newer flags from linux/if.h |
| 59 | * However, we cannot include linux/if.h directly as it conflicts |
| 60 | * with the glibc version. D'oh! */ |
| 61 | #ifndef IFF_LOWER_UP |
| 62 | #define IFF_LOWER_UP 0x10000 /* driver signals L1 up */ |
| 63 | #endif |
| 64 | /* End of ANDROID change */ |
| 65 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 66 | static int sock_fd; |
| 67 | static struct sockaddr_nl sock_nl; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 68 | |
| 69 | int |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 70 | if_init(struct interface *iface) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 71 | { |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 72 | char path[PATH_MAX]; |
| 73 | FILE *fp; |
| 74 | int n; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 75 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 76 | /* We enable promote_secondaries so that we can do this |
| 77 | * add 192.168.1.2/24 |
| 78 | * add 192.168.1.3/24 |
| 79 | * del 192.168.1.2/24 |
| 80 | * and the subnet mask moves onto 192.168.1.3/24 |
| 81 | * This matches the behaviour of BSD which makes coding dhcpcd |
| 82 | * a little easier as there's just one behaviour. */ |
| 83 | snprintf(path, sizeof(path), |
| 84 | "/proc/sys/net/ipv4/conf/%s/promote_secondaries", |
| 85 | iface->name); |
| 86 | |
| 87 | fp = fopen(path, "w"); |
| 88 | if (fp == NULL) |
| 89 | return errno == ENOENT ? 0 : -1; |
| 90 | n = fprintf(fp, "1"); |
| 91 | fclose(fp); |
| 92 | return n == -1 ? -1 : 0; |
| 93 | } |
| 94 | |
| 95 | int |
| 96 | if_conf(struct interface *iface) |
| 97 | { |
| 98 | char path[PATH_MAX], buf[1]; |
| 99 | FILE *fp; |
| 100 | |
| 101 | /* Some qeth setups require the use of the broadcast flag. */ |
| 102 | snprintf(path, sizeof(path), |
| 103 | "/sys/class/net/%s/device/layer2", |
| 104 | iface->name); |
| 105 | |
| 106 | fp = fopen(path, "r"); |
| 107 | if (fp == NULL) |
| 108 | return errno == ENOENT ? 0 : -1; |
| 109 | if (fgets(buf, sizeof(buf), fp) != NULL && buf[0] == '0') |
| 110 | iface->state->options->options |= DHCPCD_BROADCAST; |
| 111 | fclose(fp); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | static int |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 116 | _open_link_socket(struct sockaddr_nl *nl) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 117 | { |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 118 | int fd; |
| 119 | |
| 120 | if ((fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) == -1) |
| 121 | return -1; |
| 122 | nl->nl_family = AF_NETLINK; |
| 123 | if (bind(fd, (struct sockaddr *)nl, sizeof(*nl)) == -1) |
| 124 | return -1; |
| 125 | set_cloexec(fd); |
| 126 | return fd; |
| 127 | } |
| 128 | |
| 129 | int |
| 130 | init_sockets(void) |
| 131 | { |
| 132 | if ((socket_afnet = socket(AF_INET, SOCK_DGRAM, 0)) == -1) |
| 133 | return -1; |
| 134 | set_cloexec(socket_afnet); |
| 135 | sock_fd = _open_link_socket(&sock_nl); |
| 136 | set_cloexec(sock_fd); |
| 137 | return sock_fd; |
| 138 | } |
| 139 | |
| 140 | int |
| 141 | open_link_socket(void) |
| 142 | { |
| 143 | struct sockaddr_nl snl; |
| 144 | |
| 145 | memset(&snl, 0, sizeof(snl)); |
| 146 | snl.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_ROUTE | RTMGRP_IPV4_IFADDR; |
| 147 | return _open_link_socket(&snl); |
| 148 | } |
| 149 | |
| 150 | static int |
| 151 | get_netlink(int fd, int flags, |
| 152 | int (*callback)(struct nlmsghdr *)) |
| 153 | { |
| 154 | char *buf = NULL, *nbuf; |
| 155 | ssize_t buflen = 0, bytes; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 156 | struct nlmsghdr *nlm; |
| 157 | int r = -1; |
| 158 | |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 159 | for (;;) { |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 160 | bytes = recv(fd, NULL, 0, |
| 161 | flags | MSG_PEEK | MSG_DONTWAIT | MSG_TRUNC); |
| 162 | if (bytes == -1) { |
| 163 | if (errno == EAGAIN) { |
| 164 | r = 0; |
| 165 | goto eexit; |
| 166 | } |
| 167 | if (errno == EINTR) |
| 168 | continue; |
| 169 | goto eexit; |
| 170 | } else if (bytes == buflen) { |
| 171 | /* Support kernels older than 2.6.22 */ |
| 172 | if (bytes == 0) |
| 173 | bytes = 512; |
| 174 | else |
| 175 | bytes *= 2; |
| 176 | } |
| 177 | if (buflen < bytes) { |
| 178 | /* Alloc 1 more so we work with older kernels */ |
| 179 | buflen = bytes + 1; |
| 180 | nbuf = realloc(buf, buflen); |
| 181 | if (nbuf == NULL) |
| 182 | goto eexit; |
| 183 | buf = nbuf; |
| 184 | } |
| 185 | bytes = recv(fd, buf, buflen, flags); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 186 | if (bytes == -1) { |
| 187 | if (errno == EAGAIN) { |
| 188 | r = 0; |
| 189 | goto eexit; |
| 190 | } |
| 191 | if (errno == EINTR) |
| 192 | continue; |
| 193 | goto eexit; |
| 194 | } |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 195 | for (nlm = (struct nlmsghdr *)buf; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 196 | NLMSG_OK(nlm, (size_t)bytes); |
| 197 | nlm = NLMSG_NEXT(nlm, bytes)) |
| 198 | { |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 199 | r = callback(nlm); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 200 | if (r != 0) |
| 201 | goto eexit; |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | eexit: |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 206 | free(buf); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 207 | return r; |
| 208 | } |
| 209 | |
| 210 | static int |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 211 | err_netlink(struct nlmsghdr *nlm) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 212 | { |
| 213 | struct nlmsgerr *err; |
| 214 | int l; |
| 215 | |
| 216 | if (nlm->nlmsg_type != NLMSG_ERROR) |
| 217 | return 0; |
| 218 | l = nlm->nlmsg_len - sizeof(*nlm); |
| 219 | if ((size_t)l < sizeof(*err)) { |
| 220 | errno = EBADMSG; |
| 221 | return -1; |
| 222 | } |
| 223 | err = (struct nlmsgerr *)NLMSG_DATA(nlm); |
| 224 | if (err->error == 0) |
| 225 | return l; |
| 226 | errno = -err->error; |
| 227 | return -1; |
| 228 | } |
| 229 | |
| 230 | static int |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 231 | link_route(struct nlmsghdr *nlm) |
| 232 | { |
| 233 | int len, idx, metric; |
| 234 | struct rtattr *rta; |
| 235 | struct rtmsg *rtm; |
| 236 | struct rt rt; |
| 237 | char ifn[IF_NAMESIZE + 1]; |
| 238 | |
| 239 | if (nlm->nlmsg_type != RTM_DELROUTE) |
| 240 | return 0; |
| 241 | |
| 242 | len = nlm->nlmsg_len - sizeof(*nlm); |
| 243 | if ((size_t)len < sizeof(*rtm)) { |
| 244 | errno = EBADMSG; |
| 245 | return -1; |
| 246 | } |
| 247 | rtm = NLMSG_DATA(nlm); |
| 248 | if (rtm->rtm_type != RTN_UNICAST || |
| 249 | rtm->rtm_table != RT_TABLE_MAIN || |
| 250 | rtm->rtm_family != AF_INET || |
| 251 | nlm->nlmsg_pid == (uint32_t)getpid()) |
| 252 | return 1; |
| 253 | rta = (struct rtattr *) ((char *)rtm + NLMSG_ALIGN(sizeof(*rtm))); |
| 254 | len = NLMSG_PAYLOAD(nlm, sizeof(*rtm)); |
| 255 | rt.iface = NULL; |
| 256 | rt.dest.s_addr = INADDR_ANY; |
| 257 | rt.net.s_addr = INADDR_ANY; |
| 258 | rt.gate.s_addr = INADDR_ANY; |
| 259 | rt.next = NULL; |
| 260 | metric = 0; |
| 261 | while (RTA_OK(rta, len)) { |
| 262 | switch (rta->rta_type) { |
| 263 | case RTA_DST: |
| 264 | memcpy(&rt.dest.s_addr, RTA_DATA(rta), |
| 265 | sizeof(rt.dest.s_addr)); |
| 266 | break; |
| 267 | case RTA_GATEWAY: |
| 268 | memcpy(&rt.gate.s_addr, RTA_DATA(rta), |
| 269 | sizeof(rt.gate.s_addr)); |
| 270 | break; |
| 271 | case RTA_OIF: |
| 272 | idx = *(int *)RTA_DATA(rta); |
| 273 | if (if_indextoname(idx, ifn)) |
| 274 | rt.iface = find_interface(ifn); |
| 275 | break; |
| 276 | case RTA_PRIORITY: |
| 277 | metric = *(int *)RTA_DATA(rta); |
| 278 | break; |
| 279 | } |
| 280 | rta = RTA_NEXT(rta, len); |
| 281 | } |
| 282 | if (rt.iface != NULL) { |
| 283 | if (metric == rt.iface->metric) { |
| 284 | inet_cidrtoaddr(rtm->rtm_dst_len, &rt.net); |
| 285 | route_deleted(&rt); |
| 286 | } |
| 287 | } |
| 288 | return 1; |
| 289 | } |
| 290 | |
| 291 | static int |
| 292 | link_addr(struct nlmsghdr *nlm) |
| 293 | { |
| 294 | int len; |
| 295 | struct rtattr *rta; |
| 296 | struct ifaddrmsg *ifa; |
| 297 | struct in_addr addr, net, dest; |
| 298 | char ifn[IF_NAMESIZE + 1]; |
| 299 | struct interface *iface; |
| 300 | |
| 301 | if (nlm->nlmsg_type != RTM_DELADDR && nlm->nlmsg_type != RTM_NEWADDR) |
| 302 | return 0; |
| 303 | |
| 304 | len = nlm->nlmsg_len - sizeof(*nlm); |
| 305 | if ((size_t)len < sizeof(*ifa)) { |
| 306 | errno = EBADMSG; |
| 307 | return -1; |
| 308 | } |
| 309 | if (nlm->nlmsg_pid == (uint32_t)getpid()) |
| 310 | return 1; |
| 311 | ifa = NLMSG_DATA(nlm); |
| 312 | if (if_indextoname(ifa->ifa_index, ifn) == NULL) |
| 313 | return -1; |
| 314 | iface = find_interface(ifn); |
| 315 | if (iface == NULL) |
| 316 | return 1; |
| 317 | rta = (struct rtattr *) IFA_RTA(ifa); |
| 318 | len = NLMSG_PAYLOAD(nlm, sizeof(*ifa)); |
| 319 | addr.s_addr = dest.s_addr = INADDR_ANY; |
| 320 | dest.s_addr = INADDR_ANY; |
| 321 | inet_cidrtoaddr(ifa->ifa_prefixlen, &net); |
| 322 | while (RTA_OK(rta, len)) { |
| 323 | switch (rta->rta_type) { |
| 324 | case IFA_ADDRESS: |
| 325 | if (iface->flags & IFF_POINTOPOINT) { |
| 326 | memcpy(&dest.s_addr, RTA_DATA(rta), |
| 327 | sizeof(addr.s_addr)); |
| 328 | } |
| 329 | break; |
| 330 | case IFA_LOCAL: |
| 331 | memcpy(&addr.s_addr, RTA_DATA(rta), |
| 332 | sizeof(addr.s_addr)); |
| 333 | break; |
| 334 | } |
| 335 | rta = RTA_NEXT(rta, len); |
| 336 | } |
| 337 | handle_ifa(nlm->nlmsg_type, ifn, &addr, &net, &dest); |
| 338 | return 1; |
| 339 | } |
| 340 | |
| 341 | static int |
| 342 | link_netlink(struct nlmsghdr *nlm) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 343 | { |
| 344 | int len; |
| 345 | struct rtattr *rta; |
| 346 | struct ifinfomsg *ifi; |
| 347 | char ifn[IF_NAMESIZE + 1]; |
| 348 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 349 | len = link_route(nlm); |
| 350 | if (len != 0) |
| 351 | return len; |
| 352 | len = link_addr(nlm); |
| 353 | if (len != 0) |
| 354 | return len; |
| 355 | |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 356 | if (nlm->nlmsg_type != RTM_NEWLINK && nlm->nlmsg_type != RTM_DELLINK) |
| 357 | return 0; |
| 358 | len = nlm->nlmsg_len - sizeof(*nlm); |
| 359 | if ((size_t)len < sizeof(*ifi)) { |
| 360 | errno = EBADMSG; |
| 361 | return -1; |
| 362 | } |
| 363 | ifi = NLMSG_DATA(nlm); |
| 364 | if (ifi->ifi_flags & IFF_LOOPBACK) |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 365 | return 1; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 366 | rta = (struct rtattr *) ((char *)ifi + NLMSG_ALIGN(sizeof(*ifi))); |
| 367 | len = NLMSG_PAYLOAD(nlm, sizeof(*ifi)); |
| 368 | *ifn = '\0'; |
| 369 | while (RTA_OK(rta, len)) { |
| 370 | switch (rta->rta_type) { |
| 371 | case IFLA_WIRELESS: |
| 372 | /* Ignore wireless messages */ |
| 373 | if (nlm->nlmsg_type == RTM_NEWLINK && |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 374 | ifi->ifi_change == 0) |
| 375 | return 1; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 376 | break; |
| 377 | case IFLA_IFNAME: |
| 378 | strlcpy(ifn, RTA_DATA(rta), sizeof(ifn)); |
| 379 | break; |
| 380 | } |
| 381 | rta = RTA_NEXT(rta, len); |
| 382 | } |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 383 | |
| 384 | if (nlm->nlmsg_type == RTM_DELLINK) { |
| 385 | handle_interface(-1, ifn); |
| 386 | return 1; |
| 387 | } |
| 388 | |
| 389 | /* Bridge interfaces set IFF_LOWER_UP when they have a valid |
| 390 | * hardware address. To trigger a valid hardware address pickup |
| 391 | * we need to pretend that that don't exist until they have |
| 392 | * IFF_LOWER_UP set. */ |
| 393 | if (ifi->ifi_flags & IFF_MASTER && !(ifi->ifi_flags & IFF_LOWER_UP)) { |
| 394 | handle_interface(-1, ifn); |
| 395 | return 1; |
| 396 | } |
| 397 | |
| 398 | handle_carrier(ifi->ifi_flags & IFF_RUNNING ? 1 : -1, |
| 399 | ifi->ifi_flags, ifn); |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 400 | return 1; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 401 | } |
| 402 | |
| 403 | int |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 404 | manage_link(int fd) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 405 | { |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 406 | return get_netlink(fd, MSG_DONTWAIT, &link_netlink); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 407 | } |
| 408 | |
| 409 | static int |
| 410 | send_netlink(struct nlmsghdr *hdr) |
| 411 | { |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 412 | int r; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 413 | struct iovec iov; |
| 414 | struct msghdr msg; |
| 415 | static unsigned int seq; |
| 416 | |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 417 | memset(&iov, 0, sizeof(iov)); |
| 418 | iov.iov_base = hdr; |
| 419 | iov.iov_len = hdr->nlmsg_len; |
| 420 | memset(&msg, 0, sizeof(msg)); |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 421 | msg.msg_name = &sock_nl; |
| 422 | msg.msg_namelen = sizeof(sock_nl); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 423 | msg.msg_iov = &iov; |
| 424 | msg.msg_iovlen = 1; |
| 425 | /* Request a reply */ |
| 426 | hdr->nlmsg_flags |= NLM_F_ACK; |
| 427 | hdr->nlmsg_seq = ++seq; |
| 428 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 429 | if (sendmsg(sock_fd, &msg, 0) != -1) |
| 430 | r = get_netlink(sock_fd, 0, &err_netlink); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 431 | else |
| 432 | r = -1; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 433 | return r; |
| 434 | } |
| 435 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 436 | #define NLMSG_TAIL(nmsg) \ |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 437 | ((struct rtattr *)(((ptrdiff_t)(nmsg))+NLMSG_ALIGN((nmsg)->nlmsg_len))) |
| 438 | |
| 439 | static int |
| 440 | add_attr_l(struct nlmsghdr *n, unsigned int maxlen, int type, |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 441 | const void *data, int alen) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 442 | { |
| 443 | int len = RTA_LENGTH(alen); |
| 444 | struct rtattr *rta; |
| 445 | |
| 446 | if (NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len) > maxlen) { |
| 447 | errno = ENOBUFS; |
| 448 | return -1; |
| 449 | } |
| 450 | |
| 451 | rta = NLMSG_TAIL(n); |
| 452 | rta->rta_type = type; |
| 453 | rta->rta_len = len; |
| 454 | memcpy(RTA_DATA(rta), data, alen); |
| 455 | n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len); |
| 456 | |
| 457 | return 0; |
| 458 | } |
| 459 | |
| 460 | static int |
| 461 | add_attr_32(struct nlmsghdr *n, unsigned int maxlen, int type, uint32_t data) |
| 462 | { |
| 463 | int len = RTA_LENGTH(sizeof(data)); |
| 464 | struct rtattr *rta; |
| 465 | |
| 466 | if (NLMSG_ALIGN(n->nlmsg_len) + len > maxlen) { |
| 467 | errno = ENOBUFS; |
| 468 | return -1; |
| 469 | } |
| 470 | |
| 471 | rta = NLMSG_TAIL(n); |
| 472 | rta->rta_type = type; |
| 473 | rta->rta_len = len; |
| 474 | memcpy(RTA_DATA(rta), &data, sizeof(data)); |
| 475 | n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len; |
| 476 | |
| 477 | return 0; |
| 478 | } |
| 479 | |
| 480 | struct nlma |
| 481 | { |
| 482 | struct nlmsghdr hdr; |
| 483 | struct ifaddrmsg ifa; |
| 484 | char buffer[64]; |
| 485 | }; |
| 486 | |
| 487 | struct nlmr |
| 488 | { |
| 489 | struct nlmsghdr hdr; |
| 490 | struct rtmsg rt; |
| 491 | char buffer[256]; |
| 492 | }; |
| 493 | |
| 494 | int |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 495 | if_address(const struct interface *iface, |
| 496 | const struct in_addr *address, const struct in_addr *netmask, |
| 497 | const struct in_addr *broadcast, int action) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 498 | { |
| 499 | struct nlma *nlm; |
| 500 | int retval = 0; |
| 501 | |
| 502 | nlm = xzalloc(sizeof(*nlm)); |
| 503 | nlm->hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)); |
| 504 | nlm->hdr.nlmsg_flags = NLM_F_REQUEST; |
| 505 | if (action >= 0) { |
| 506 | nlm->hdr.nlmsg_flags |= NLM_F_CREATE | NLM_F_REPLACE; |
| 507 | nlm->hdr.nlmsg_type = RTM_NEWADDR; |
| 508 | } else |
| 509 | nlm->hdr.nlmsg_type = RTM_DELADDR; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 510 | if (!(nlm->ifa.ifa_index = if_nametoindex(iface->name))) { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 511 | free(nlm); |
| 512 | errno = ENODEV; |
| 513 | return -1; |
| 514 | } |
| 515 | nlm->ifa.ifa_family = AF_INET; |
| 516 | nlm->ifa.ifa_prefixlen = inet_ntocidr(*netmask); |
| 517 | /* This creates the aliased interface */ |
| 518 | add_attr_l(&nlm->hdr, sizeof(*nlm), IFA_LABEL, |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 519 | iface->name, strlen(iface->name) + 1); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 520 | add_attr_l(&nlm->hdr, sizeof(*nlm), IFA_LOCAL, |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 521 | &address->s_addr, sizeof(address->s_addr)); |
| 522 | if (action >= 0 && broadcast) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 523 | add_attr_l(&nlm->hdr, sizeof(*nlm), IFA_BROADCAST, |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 524 | &broadcast->s_addr, sizeof(broadcast->s_addr)); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 525 | |
| 526 | if (send_netlink(&nlm->hdr) == -1) |
| 527 | retval = -1; |
| 528 | free(nlm); |
| 529 | return retval; |
| 530 | } |
| 531 | |
| 532 | int |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 533 | if_route(const struct rt *rt, int action) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 534 | { |
| 535 | struct nlmr *nlm; |
| 536 | unsigned int ifindex; |
| 537 | int retval = 0; |
| 538 | |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 539 | if (!(ifindex = if_nametoindex(rt->iface->name))) { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 540 | errno = ENODEV; |
| 541 | return -1; |
| 542 | } |
| 543 | |
| 544 | nlm = xzalloc(sizeof(*nlm)); |
| 545 | nlm->hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); |
| 546 | nlm->hdr.nlmsg_type = RTM_NEWROUTE; |
| 547 | if (action == 0) |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 548 | nlm->hdr.nlmsg_flags = NLM_F_REPLACE; |
| 549 | else if (action == 1) |
Dmitry Shmidt | 0545fad | 2011-01-24 16:42:36 -0800 | [diff] [blame] | 550 | nlm->hdr.nlmsg_flags = NLM_F_CREATE /*| NLM_F_EXCL*/; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 551 | else |
| 552 | nlm->hdr.nlmsg_type = RTM_DELROUTE; |
| 553 | nlm->hdr.nlmsg_flags |= NLM_F_REQUEST; |
| 554 | nlm->rt.rtm_family = AF_INET; |
| 555 | nlm->rt.rtm_table = RT_TABLE_MAIN; |
| 556 | |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 557 | if (action == -1 || action == -2) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 558 | nlm->rt.rtm_scope = RT_SCOPE_NOWHERE; |
| 559 | else { |
Dmitry Shmidt | 0545fad | 2011-01-24 16:42:36 -0800 | [diff] [blame] | 560 | nlm->hdr.nlmsg_flags |= NLM_F_CREATE /*| NLM_F_EXCL*/; |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 561 | /* We only change route metrics for kernel routes */ |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 562 | if (rt->dest.s_addr == |
| 563 | (rt->iface->addr.s_addr & rt->iface->net.s_addr) && |
| 564 | rt->net.s_addr == rt->iface->net.s_addr) |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 565 | nlm->rt.rtm_protocol = RTPROT_KERNEL; |
| 566 | else |
| 567 | nlm->rt.rtm_protocol = RTPROT_BOOT; |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 568 | if (rt->gate.s_addr == INADDR_ANY || |
| 569 | (rt->gate.s_addr == rt->dest.s_addr && |
| 570 | rt->net.s_addr == INADDR_BROADCAST)) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 571 | nlm->rt.rtm_scope = RT_SCOPE_LINK; |
| 572 | else |
| 573 | nlm->rt.rtm_scope = RT_SCOPE_UNIVERSE; |
| 574 | nlm->rt.rtm_type = RTN_UNICAST; |
| 575 | } |
| 576 | |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 577 | nlm->rt.rtm_dst_len = inet_ntocidr(rt->net); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 578 | add_attr_l(&nlm->hdr, sizeof(*nlm), RTA_DST, |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 579 | &rt->dest.s_addr, sizeof(rt->dest.s_addr)); |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 580 | if (nlm->rt.rtm_protocol == RTPROT_KERNEL) { |
| 581 | add_attr_l(&nlm->hdr, sizeof(*nlm), RTA_PREFSRC, |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 582 | &rt->iface->addr.s_addr, sizeof(rt->iface->addr.s_addr)); |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 583 | } |
| 584 | /* If destination == gateway then don't add the gateway */ |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 585 | if (rt->dest.s_addr != rt->gate.s_addr || |
| 586 | rt->net.s_addr != INADDR_BROADCAST) |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 587 | add_attr_l(&nlm->hdr, sizeof(*nlm), RTA_GATEWAY, |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 588 | &rt->gate.s_addr, sizeof(rt->gate.s_addr)); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 589 | |
| 590 | add_attr_32(&nlm->hdr, sizeof(*nlm), RTA_OIF, ifindex); |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 591 | add_attr_32(&nlm->hdr, sizeof(*nlm), RTA_PRIORITY, rt->metric); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 592 | |
| 593 | if (send_netlink(&nlm->hdr) == -1) |
| 594 | retval = -1; |
| 595 | free(nlm); |
| 596 | return retval; |
| 597 | } |