Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 1 | /* |
| 2 | * dhcpcd - DHCP client daemon |
| 3 | * Copyright (c) 2006-2015 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/time.h> |
| 34 | #include <sys/types.h> |
| 35 | #include <sys/uio.h> |
| 36 | #include <sys/utsname.h> |
| 37 | |
| 38 | #include <arpa/inet.h> |
| 39 | #include <net/bpf.h> |
| 40 | #include <net/if.h> |
| 41 | #include <net/if_dl.h> |
| 42 | #ifdef __FreeBSD__ /* Needed so that including netinet6/in6_var.h works */ |
| 43 | # include <net/if_var.h> |
| 44 | #endif |
| 45 | #include <net/if_media.h> |
| 46 | #include <net/route.h> |
| 47 | #include <netinet/if_ether.h> |
| 48 | #include <netinet/in.h> |
| 49 | #include <netinet/in_var.h> |
| 50 | #include <netinet6/in6_var.h> |
| 51 | #include <netinet6/nd6.h> |
| 52 | #ifdef __DragonFly__ |
| 53 | # include <netproto/802_11/ieee80211_ioctl.h> |
| 54 | #elif __APPLE__ |
| 55 | /* FIXME: Add apple includes so we can work out SSID */ |
| 56 | #else |
| 57 | # include <net80211/ieee80211.h> |
| 58 | # include <net80211/ieee80211_ioctl.h> |
| 59 | #endif |
| 60 | |
| 61 | #include <errno.h> |
| 62 | #include <fcntl.h> |
| 63 | #include <fnmatch.h> |
| 64 | #include <paths.h> |
| 65 | #include <stddef.h> |
| 66 | #include <stdio.h> |
| 67 | #include <stdlib.h> |
| 68 | #include <string.h> |
| 69 | #include <unistd.h> |
| 70 | |
| 71 | #if defined(OpenBSD) && OpenBSD >= 201411 |
| 72 | /* OpenBSD dropped the global setting from sysctl but left the #define |
| 73 | * which causes a EPERM error when trying to use it. |
| 74 | * I think both the error and keeping the define are wrong, so we #undef it. */ |
| 75 | #undef IPV6CTL_ACCEPT_RTADV |
| 76 | #endif |
| 77 | |
| 78 | #include "config.h" |
| 79 | #include "common.h" |
| 80 | #include "dhcp.h" |
| 81 | #include "if.h" |
| 82 | #include "if-options.h" |
| 83 | #include "ipv4.h" |
| 84 | #include "ipv6.h" |
| 85 | #include "ipv6nd.h" |
| 86 | |
| 87 | #include "bpf-filter.h" |
| 88 | |
| 89 | #ifndef RT_ROUNDUP |
| 90 | #define RT_ROUNDUP(a) \ |
| 91 | ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) |
| 92 | #define RT_ADVANCE(x, n) (x += RT_ROUNDUP((n)->sa_len)) |
| 93 | #endif |
| 94 | |
| 95 | #define COPYOUT(sin, sa) do { \ |
| 96 | if ((sa) && ((sa)->sa_family == AF_INET || (sa)->sa_family == 255)) \ |
| 97 | (sin) = ((struct sockaddr_in*)(void *)(sa))->sin_addr; \ |
| 98 | } while (0) |
| 99 | |
| 100 | #define COPYOUT6(sin, sa) do { \ |
| 101 | if ((sa) && ((sa)->sa_family == AF_INET6 || (sa)->sa_family == 255)) \ |
| 102 | (sin) = ((struct sockaddr_in6*)(void *)(sa))->sin6_addr; \ |
| 103 | } while (0) |
| 104 | |
| 105 | #ifndef CLLADDR |
| 106 | # define CLLADDR(s) ((const char *)((s)->sdl_data + (s)->sdl_nlen)) |
| 107 | #endif |
| 108 | |
| 109 | int |
| 110 | if_init(__unused struct interface *iface) |
| 111 | { |
| 112 | /* BSD promotes secondary address by default */ |
| 113 | return 0; |
| 114 | } |
| 115 | |
| 116 | int |
| 117 | if_conf(__unused struct interface *iface) |
| 118 | { |
| 119 | /* No extra checks needed on BSD */ |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | int |
| 124 | if_openlinksocket(void) |
| 125 | { |
| 126 | |
| 127 | #ifdef SOCK_CLOEXEC |
| 128 | return socket(PF_ROUTE, SOCK_RAW | SOCK_CLOEXEC | SOCK_NONBLOCK, 0); |
| 129 | #else |
| 130 | int s, flags; |
| 131 | |
| 132 | if ((s = socket(PF_ROUTE, SOCK_RAW, 0)) == -1) |
| 133 | return -1; |
| 134 | if ((flags = fcntl(s, F_GETFD, 0)) == -1 || |
| 135 | fcntl(s, F_SETFD, flags | FD_CLOEXEC) == -1) |
| 136 | { |
| 137 | close(s); |
| 138 | return -1; |
| 139 | } |
| 140 | if ((flags = fcntl(s, F_GETFL, 0)) == -1 || |
| 141 | fcntl(s, F_SETFL, flags | O_NONBLOCK) == -1) |
| 142 | { |
| 143 | close(s); |
| 144 | return -1; |
| 145 | } |
| 146 | return s; |
| 147 | #endif |
| 148 | } |
| 149 | |
| 150 | #if defined(INET) || defined(INET6) |
| 151 | static void |
| 152 | if_linkaddr(struct sockaddr_dl *sdl, const struct interface *ifp) |
| 153 | { |
| 154 | |
| 155 | memset(sdl, 0, sizeof(*sdl)); |
| 156 | sdl->sdl_family = AF_LINK; |
| 157 | sdl->sdl_len = sizeof(*sdl); |
| 158 | sdl->sdl_nlen = sdl->sdl_alen = sdl->sdl_slen = 0; |
| 159 | sdl->sdl_index = (unsigned short)ifp->index; |
| 160 | } |
| 161 | #endif |
| 162 | |
| 163 | static int |
| 164 | if_getssid1(const char *ifname, uint8_t *ssid) |
| 165 | { |
| 166 | int s, retval = -1; |
| 167 | #if defined(SIOCG80211NWID) |
| 168 | struct ifreq ifr; |
| 169 | struct ieee80211_nwid nwid; |
| 170 | #elif defined(IEEE80211_IOC_SSID) |
| 171 | struct ieee80211req ireq; |
| 172 | char nwid[IEEE80211_NWID_LEN + 1]; |
| 173 | #endif |
| 174 | |
| 175 | if ((s = socket(PF_INET, SOCK_DGRAM, 0)) == -1) |
| 176 | return -1; |
| 177 | |
| 178 | #if defined(SIOCG80211NWID) /* NetBSD */ |
| 179 | memset(&ifr, 0, sizeof(ifr)); |
| 180 | strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); |
| 181 | memset(&nwid, 0, sizeof(nwid)); |
| 182 | ifr.ifr_data = (void *)&nwid; |
| 183 | if (ioctl(s, SIOCG80211NWID, &ifr) == 0) { |
| 184 | if (ssid == NULL) |
| 185 | retval = nwid.i_len; |
| 186 | else if (nwid.i_len > IF_SSIDSIZE) { |
| 187 | errno = ENOBUFS; |
| 188 | retval = -1; |
| 189 | } else { |
| 190 | retval = nwid.i_len; |
| 191 | memcpy(ssid, nwid.i_nwid, nwid.i_len); |
| 192 | ssid[nwid.i_len] = '\0'; |
| 193 | } |
| 194 | } |
| 195 | #elif defined(IEEE80211_IOC_SSID) /* FreeBSD */ |
| 196 | memset(&ireq, 0, sizeof(ireq)); |
| 197 | strlcpy(ireq.i_name, ifname, sizeof(ireq.i_name)); |
| 198 | ireq.i_type = IEEE80211_IOC_SSID; |
| 199 | ireq.i_val = -1; |
| 200 | memset(nwid, 0, sizeof(nwid)); |
| 201 | ireq.i_data = &nwid; |
| 202 | if (ioctl(s, SIOCG80211, &ireq) == 0) { |
| 203 | if (ssid == NULL) |
| 204 | retval = ireq.i_len; |
| 205 | else if (ireq.i_len > IF_SSIDSIZE) { |
| 206 | errno = ENOBUFS; |
| 207 | retval = -1; |
| 208 | } else { |
| 209 | retval = ireq.i_len; |
| 210 | memcpy(ssid, nwid, ireq.i_len); |
| 211 | ssid[ireq.i_len] = '\0'; |
| 212 | } |
| 213 | } |
| 214 | #endif |
| 215 | |
| 216 | close(s); |
| 217 | return retval; |
| 218 | } |
| 219 | |
| 220 | int |
| 221 | if_getssid(struct interface *ifp) |
| 222 | { |
| 223 | int r; |
| 224 | |
| 225 | r = if_getssid1(ifp->name, ifp->ssid); |
| 226 | if (r != -1) |
| 227 | ifp->ssid_len = (unsigned int)r; |
| 228 | return r; |
| 229 | } |
| 230 | |
| 231 | /* |
| 232 | * FreeBSD allows for Virtual Access Points |
| 233 | * We need to check if the interface is a Virtual Interface Master |
| 234 | * and if so, don't use it. |
| 235 | * This check is made by virtue of being a IEEE80211 device but |
| 236 | * returning the SSID gives an error. |
| 237 | */ |
| 238 | int |
| 239 | if_vimaster(const char *ifname) |
| 240 | { |
| 241 | int s, r; |
| 242 | struct ifmediareq ifmr; |
| 243 | |
| 244 | if ((s = socket(PF_INET, SOCK_DGRAM, 0)) == -1) |
| 245 | return -1; |
| 246 | memset(&ifmr, 0, sizeof(ifmr)); |
| 247 | strlcpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name)); |
| 248 | r = ioctl(s, SIOCGIFMEDIA, &ifmr); |
| 249 | close(s); |
| 250 | if (r == -1) |
| 251 | return -1; |
| 252 | if (ifmr.ifm_status & IFM_AVALID && |
| 253 | IFM_TYPE(ifmr.ifm_active) == IFM_IEEE80211) |
| 254 | { |
| 255 | if (if_getssid1(ifname, NULL) == -1) |
| 256 | return 1; |
| 257 | } |
| 258 | return 0; |
| 259 | } |
| 260 | |
| 261 | static void |
| 262 | get_addrs(int type, char *cp, struct sockaddr **sa) |
| 263 | { |
| 264 | int i; |
| 265 | |
| 266 | for (i = 0; i < RTAX_MAX; i++) { |
| 267 | if (type & (1 << i)) { |
| 268 | sa[i] = (struct sockaddr *)cp; |
| 269 | RT_ADVANCE(cp, sa[i]); |
| 270 | } else |
| 271 | sa[i] = NULL; |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | #if defined(INET) || defined(INET6) |
| 276 | static struct interface * |
| 277 | if_findsdl(struct dhcpcd_ctx *ctx, struct sockaddr_dl *sdl) |
| 278 | { |
| 279 | |
| 280 | if (sdl->sdl_nlen) { |
| 281 | char ifname[IF_NAMESIZE]; |
| 282 | memcpy(ifname, sdl->sdl_data, sdl->sdl_nlen); |
| 283 | ifname[sdl->sdl_nlen] = '\0'; |
| 284 | return if_find(ctx->ifaces, ifname); |
| 285 | } |
| 286 | return NULL; |
| 287 | } |
| 288 | #endif |
| 289 | |
| 290 | #ifdef INET |
| 291 | const char *if_pfname = "Berkley Packet Filter"; |
| 292 | |
| 293 | int |
| 294 | if_openrawsocket(struct interface *ifp, uint16_t protocol) |
| 295 | { |
| 296 | struct dhcp_state *state; |
| 297 | int fd = -1; |
| 298 | struct ifreq ifr; |
| 299 | int ibuf_len = 0; |
| 300 | size_t buf_len; |
| 301 | struct bpf_version pv; |
| 302 | struct bpf_program pf; |
| 303 | #ifdef BIOCIMMEDIATE |
| 304 | int flags; |
| 305 | #endif |
| 306 | #ifdef _PATH_BPF |
| 307 | fd = open(_PATH_BPF, O_RDWR | O_CLOEXEC | O_NONBLOCK); |
| 308 | #else |
| 309 | char device[32]; |
| 310 | int n = 0; |
| 311 | |
| 312 | do { |
| 313 | snprintf(device, sizeof(device), "/dev/bpf%d", n++); |
| 314 | fd = open(device, O_RDWR | O_CLOEXEC | O_NONBLOCK); |
| 315 | } while (fd == -1 && errno == EBUSY); |
| 316 | #endif |
| 317 | |
| 318 | if (fd == -1) |
| 319 | return -1; |
| 320 | |
| 321 | state = D_STATE(ifp); |
| 322 | |
| 323 | memset(&pv, 0, sizeof(pv)); |
| 324 | if (ioctl(fd, BIOCVERSION, &pv) == -1) |
| 325 | goto eexit; |
| 326 | if (pv.bv_major != BPF_MAJOR_VERSION || |
| 327 | pv.bv_minor < BPF_MINOR_VERSION) { |
| 328 | logger(ifp->ctx, LOG_ERR, "BPF version mismatch - recompile"); |
| 329 | goto eexit; |
| 330 | } |
| 331 | |
| 332 | memset(&ifr, 0, sizeof(ifr)); |
| 333 | strlcpy(ifr.ifr_name, ifp->name, sizeof(ifr.ifr_name)); |
| 334 | if (ioctl(fd, BIOCSETIF, &ifr) == -1) |
| 335 | goto eexit; |
| 336 | |
| 337 | /* Get the required BPF buffer length from the kernel. */ |
| 338 | if (ioctl(fd, BIOCGBLEN, &ibuf_len) == -1) |
| 339 | goto eexit; |
| 340 | buf_len = (size_t)ibuf_len; |
| 341 | if (state->buffer_size != buf_len) { |
| 342 | free(state->buffer); |
| 343 | state->buffer = malloc(buf_len); |
| 344 | if (state->buffer == NULL) |
| 345 | goto eexit; |
| 346 | state->buffer_size = buf_len; |
| 347 | state->buffer_len = state->buffer_pos = 0; |
| 348 | } |
| 349 | |
| 350 | #ifdef BIOCIMMEDIATE |
| 351 | flags = 1; |
| 352 | if (ioctl(fd, BIOCIMMEDIATE, &flags) == -1) |
| 353 | goto eexit; |
| 354 | #endif |
| 355 | |
| 356 | /* Install the DHCP filter */ |
| 357 | memset(&pf, 0, sizeof(pf)); |
| 358 | if (protocol == ETHERTYPE_ARP) { |
| 359 | pf.bf_insns = UNCONST(arp_bpf_filter); |
| 360 | pf.bf_len = arp_bpf_filter_len; |
| 361 | } else { |
| 362 | pf.bf_insns = UNCONST(dhcp_bpf_filter); |
| 363 | pf.bf_len = dhcp_bpf_filter_len; |
| 364 | } |
| 365 | if (ioctl(fd, BIOCSETF, &pf) == -1) |
| 366 | goto eexit; |
| 367 | |
| 368 | return fd; |
| 369 | |
| 370 | eexit: |
| 371 | free(state->buffer); |
| 372 | state->buffer = NULL; |
| 373 | close(fd); |
| 374 | return -1; |
| 375 | } |
| 376 | |
| 377 | ssize_t |
| 378 | if_sendrawpacket(const struct interface *ifp, uint16_t protocol, |
Samuel Tan | f20514b | 2015-08-13 16:24:02 -0700 | [diff] [blame] | 379 | const void *data, size_t len, const uint8_t *dest_hw_addr) |
Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 380 | { |
| 381 | struct iovec iov[2]; |
| 382 | struct ether_header hw; |
| 383 | int fd; |
| 384 | const struct dhcp_state *state; |
| 385 | |
| 386 | memset(&hw, 0, ETHER_HDR_LEN); |
Samuel Tan | f20514b | 2015-08-13 16:24:02 -0700 | [diff] [blame] | 387 | if (dest_hw_addr) |
| 388 | memcpy(&hw.ether_dhost, dest_hw_addr, ETHER_ADDR_LEN); |
| 389 | else |
| 390 | memset(&hw.ether_dhost, 0xff, ETHER_ADDR_LEN); |
Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 391 | hw.ether_type = htons(protocol); |
| 392 | iov[0].iov_base = &hw; |
| 393 | iov[0].iov_len = ETHER_HDR_LEN; |
| 394 | iov[1].iov_base = UNCONST(data); |
| 395 | iov[1].iov_len = len; |
| 396 | state = D_CSTATE(ifp); |
| 397 | if (protocol == ETHERTYPE_ARP) |
| 398 | fd = state->arp_fd; |
| 399 | else |
| 400 | fd = state->raw_fd; |
| 401 | return writev(fd, iov, 2); |
| 402 | } |
| 403 | |
| 404 | /* BPF requires that we read the entire buffer. |
| 405 | * So we pass the buffer in the API so we can loop on >1 packet. */ |
| 406 | ssize_t |
| 407 | if_readrawpacket(struct interface *ifp, uint16_t protocol, |
| 408 | void *data, size_t len, int *flags) |
| 409 | { |
| 410 | int fd; |
| 411 | struct bpf_hdr packet; |
| 412 | ssize_t bytes; |
| 413 | const unsigned char *payload; |
| 414 | struct dhcp_state *state; |
| 415 | |
| 416 | state = D_STATE(ifp); |
| 417 | if (protocol == ETHERTYPE_ARP) |
| 418 | fd = state->arp_fd; |
| 419 | else |
| 420 | fd = state->raw_fd; |
| 421 | |
| 422 | *flags = 0; |
| 423 | for (;;) { |
| 424 | if (state->buffer_len == 0) { |
| 425 | bytes = read(fd, state->buffer, state->buffer_size); |
| 426 | if (bytes == -1 || bytes == 0) |
| 427 | return bytes; |
| 428 | state->buffer_len = (size_t)bytes; |
| 429 | state->buffer_pos = 0; |
| 430 | } |
| 431 | bytes = -1; |
| 432 | memcpy(&packet, state->buffer + state->buffer_pos, |
| 433 | sizeof(packet)); |
| 434 | if (packet.bh_caplen != packet.bh_datalen) |
| 435 | goto next; /* Incomplete packet, drop. */ |
| 436 | if (state->buffer_pos + packet.bh_caplen + packet.bh_hdrlen > |
| 437 | state->buffer_len) |
| 438 | goto next; /* Packet beyond buffer, drop. */ |
| 439 | payload = state->buffer + state->buffer_pos + |
| 440 | packet.bh_hdrlen + ETHER_HDR_LEN; |
| 441 | bytes = (ssize_t)packet.bh_caplen - ETHER_HDR_LEN; |
| 442 | if ((size_t)bytes > len) |
| 443 | bytes = (ssize_t)len; |
| 444 | memcpy(data, payload, (size_t)bytes); |
| 445 | next: |
| 446 | state->buffer_pos += BPF_WORDALIGN(packet.bh_hdrlen + |
| 447 | packet.bh_caplen); |
| 448 | if (state->buffer_pos >= state->buffer_len) { |
| 449 | state->buffer_len = state->buffer_pos = 0; |
| 450 | *flags |= RAW_EOF; |
| 451 | } |
| 452 | if (bytes != -1) |
| 453 | return bytes; |
| 454 | } |
| 455 | } |
| 456 | |
| 457 | int |
| 458 | if_address(const struct interface *ifp, const struct in_addr *address, |
| 459 | const struct in_addr *netmask, const struct in_addr *broadcast, |
| 460 | int action) |
| 461 | { |
| 462 | int s, r; |
| 463 | struct in_aliasreq ifra; |
| 464 | |
| 465 | if ((s = socket(PF_INET, SOCK_DGRAM, 0)) == -1) |
| 466 | return -1; |
| 467 | |
| 468 | memset(&ifra, 0, sizeof(ifra)); |
| 469 | strlcpy(ifra.ifra_name, ifp->name, sizeof(ifra.ifra_name)); |
| 470 | |
| 471 | #define ADDADDR(var, addr) do { \ |
| 472 | (var)->sin_family = AF_INET; \ |
| 473 | (var)->sin_len = sizeof(*(var)); \ |
| 474 | (var)->sin_addr = *(addr); \ |
| 475 | } while (/*CONSTCOND*/0) |
| 476 | ADDADDR(&ifra.ifra_addr, address); |
| 477 | ADDADDR(&ifra.ifra_mask, netmask); |
| 478 | if (action >= 0 && broadcast) |
| 479 | ADDADDR(&ifra.ifra_broadaddr, broadcast); |
| 480 | #undef ADDADDR |
| 481 | |
| 482 | r = ioctl(s, |
| 483 | action < 0 ? SIOCDIFADDR : SIOCAIFADDR, &ifra); |
| 484 | close(s); |
| 485 | return r; |
| 486 | } |
| 487 | |
| 488 | static int |
| 489 | if_copyrt(struct dhcpcd_ctx *ctx, struct rt *rt, struct rt_msghdr *rtm) |
| 490 | { |
| 491 | char *cp; |
| 492 | struct sockaddr *sa, *rti_info[RTAX_MAX]; |
| 493 | |
| 494 | cp = (char *)(void *)(rtm + 1); |
| 495 | sa = (struct sockaddr *)(void *)cp; |
| 496 | if (sa->sa_family != AF_INET) |
| 497 | return -1; |
| 498 | if (~rtm->rtm_addrs & (RTA_DST | RTA_GATEWAY)) |
| 499 | return -1; |
| 500 | #ifdef RTF_CLONED |
| 501 | if (rtm->rtm_flags & RTF_CLONED) |
| 502 | return -1; |
| 503 | #endif |
| 504 | #ifdef RTF_LOCAL |
| 505 | if (rtm->rtm_flags & RTF_LOCAL) |
| 506 | return -1; |
| 507 | #endif |
| 508 | #ifdef RTF_BROADCAST |
| 509 | if (rtm->rtm_flags & RTF_BROADCAST) |
| 510 | return -1; |
| 511 | #endif |
| 512 | |
| 513 | get_addrs(rtm->rtm_addrs, cp, rti_info); |
| 514 | memset(rt, 0, sizeof(*rt)); |
| 515 | COPYOUT(rt->dest, rti_info[RTAX_DST]); |
| 516 | if (rtm->rtm_addrs & RTA_NETMASK) |
| 517 | COPYOUT(rt->net, rti_info[RTAX_NETMASK]); |
| 518 | else |
| 519 | rt->net.s_addr = INADDR_BROADCAST; |
| 520 | COPYOUT(rt->gate, rti_info[RTAX_GATEWAY]); |
| 521 | |
| 522 | if (rtm->rtm_index) |
| 523 | rt->iface = if_findindex(ctx->ifaces, rtm->rtm_index); |
| 524 | else if (rtm->rtm_addrs & RTA_IFP) { |
| 525 | struct sockaddr_dl *sdl; |
| 526 | |
| 527 | sdl = (struct sockaddr_dl *)(void *)rti_info[RTAX_IFP]; |
| 528 | rt->iface = if_findsdl(ctx, sdl); |
| 529 | } |
| 530 | /* If we don't have an interface and it's a host route, it maybe |
| 531 | * to a local ip via the loopback interface. */ |
| 532 | if (rt->iface == NULL && |
| 533 | !(~rtm->rtm_flags & (RTF_HOST | RTF_GATEWAY))) |
| 534 | { |
| 535 | struct ipv4_addr *ia; |
| 536 | |
| 537 | if ((ia = ipv4_findaddr(ctx, &rt->dest))) |
| 538 | rt->iface = ia->iface; |
| 539 | } |
| 540 | |
| 541 | return 0; |
| 542 | } |
| 543 | |
| 544 | int |
| 545 | if_route(unsigned char cmd, const struct rt *rt) |
| 546 | { |
| 547 | const struct dhcp_state *state; |
| 548 | union sockunion { |
| 549 | struct sockaddr sa; |
| 550 | struct sockaddr_in sin; |
| 551 | struct sockaddr_dl sdl; |
| 552 | } su; |
| 553 | struct rtm |
| 554 | { |
| 555 | struct rt_msghdr hdr; |
| 556 | char buffer[sizeof(su) * RTAX_MAX]; |
| 557 | } rtm; |
| 558 | char *bp = rtm.buffer; |
| 559 | size_t l; |
| 560 | int s, retval; |
| 561 | |
| 562 | if ((s = socket(PF_ROUTE, SOCK_RAW, 0)) == -1) |
| 563 | return -1; |
| 564 | |
| 565 | #define ADDSU { \ |
| 566 | l = RT_ROUNDUP(su.sa.sa_len); \ |
| 567 | memcpy(bp, &su, l); \ |
| 568 | bp += l; \ |
| 569 | } |
| 570 | #define ADDADDR(addr) { \ |
| 571 | memset(&su, 0, sizeof(su)); \ |
| 572 | su.sin.sin_family = AF_INET; \ |
| 573 | su.sin.sin_len = sizeof(su.sin); \ |
| 574 | (&su.sin)->sin_addr = *addr; \ |
| 575 | ADDSU; \ |
| 576 | } |
| 577 | |
| 578 | if (cmd != RTM_DELETE) |
| 579 | state = D_CSTATE(rt->iface); |
| 580 | else /* appease GCC */ |
| 581 | state = NULL; |
| 582 | memset(&rtm, 0, sizeof(rtm)); |
| 583 | rtm.hdr.rtm_version = RTM_VERSION; |
| 584 | rtm.hdr.rtm_seq = 1; |
| 585 | rtm.hdr.rtm_type = cmd; |
| 586 | rtm.hdr.rtm_addrs = RTA_DST; |
| 587 | if (cmd == RTM_ADD || cmd == RTM_CHANGE) |
| 588 | rtm.hdr.rtm_addrs |= RTA_GATEWAY; |
| 589 | rtm.hdr.rtm_flags = RTF_UP; |
| 590 | #ifdef RTF_PINNED |
| 591 | if (cmd != RTM_ADD) |
| 592 | rtm.hdr.rtm_flags |= RTF_PINNED; |
| 593 | #endif |
| 594 | |
| 595 | if (cmd != RTM_DELETE) { |
| 596 | rtm.hdr.rtm_addrs |= RTA_IFA | RTA_IFP; |
| 597 | /* None interface subnet routes are static. */ |
| 598 | if (rt->gate.s_addr != INADDR_ANY || |
| 599 | rt->net.s_addr != state->net.s_addr || |
| 600 | rt->dest.s_addr != (state->addr.s_addr & state->net.s_addr)) |
| 601 | rtm.hdr.rtm_flags |= RTF_STATIC; |
| 602 | else { |
| 603 | #ifdef RTF_CLONING |
| 604 | rtm.hdr.rtm_flags |= RTF_CLONING; |
| 605 | #endif |
| 606 | #ifdef RTP_CONNECTED |
| 607 | rtm.hdr.rtm_priority = RTP_CONNECTED; |
| 608 | #endif |
| 609 | } |
| 610 | } |
| 611 | if (rt->net.s_addr == htonl(INADDR_BROADCAST) && |
| 612 | rt->gate.s_addr == htonl(INADDR_ANY)) |
| 613 | { |
| 614 | #ifdef RTF_CLONING |
| 615 | /* We add a cloning network route for a single host. |
| 616 | * Traffic to the host will generate a cloned route and the |
| 617 | * hardware address will resolve correctly. |
| 618 | * It might be more correct to use RTF_HOST instead of |
| 619 | * RTF_CLONING, and that does work, but some OS generate |
| 620 | * an arp warning diagnostic which we don't want to do. */ |
| 621 | rtm.hdr.rtm_flags |= RTF_CLONING; |
| 622 | rtm.hdr.rtm_addrs |= RTA_NETMASK; |
| 623 | #else |
| 624 | rtm.hdr.rtm_flags |= RTF_HOST; |
| 625 | #endif |
| 626 | } else if (rt->gate.s_addr == htonl(INADDR_LOOPBACK) && |
| 627 | rt->net.s_addr == htonl(INADDR_BROADCAST)) |
| 628 | { |
| 629 | rtm.hdr.rtm_flags |= RTF_HOST | RTF_GATEWAY; |
| 630 | /* Going via lo0 so remove the interface flags */ |
| 631 | if (cmd == RTM_ADD) |
| 632 | rtm.hdr.rtm_addrs &= ~(RTA_IFA | RTA_IFP); |
| 633 | } else { |
| 634 | rtm.hdr.rtm_addrs |= RTA_NETMASK; |
| 635 | if (rtm.hdr.rtm_flags & RTF_STATIC) |
| 636 | rtm.hdr.rtm_flags |= RTF_GATEWAY; |
| 637 | } |
| 638 | if ((cmd == RTM_ADD || cmd == RTM_CHANGE) && |
| 639 | !(rtm.hdr.rtm_flags & RTF_GATEWAY)) |
| 640 | rtm.hdr.rtm_addrs |= RTA_IFA | RTA_IFP; |
| 641 | |
| 642 | ADDADDR(&rt->dest); |
| 643 | if (rtm.hdr.rtm_addrs & RTA_GATEWAY) { |
| 644 | #ifdef RTF_CLONING |
| 645 | if ((rtm.hdr.rtm_flags & (RTF_HOST | RTF_CLONING) && |
| 646 | #else |
| 647 | if ((rtm.hdr.rtm_flags & RTF_HOST && |
| 648 | #endif |
| 649 | rt->gate.s_addr != htonl(INADDR_LOOPBACK)) || |
| 650 | !(rtm.hdr.rtm_flags & RTF_STATIC)) |
| 651 | { |
| 652 | if_linkaddr(&su.sdl, rt->iface); |
| 653 | ADDSU; |
| 654 | } else |
| 655 | ADDADDR(&rt->gate); |
| 656 | } |
| 657 | |
| 658 | if (rtm.hdr.rtm_addrs & RTA_NETMASK) |
| 659 | ADDADDR(&rt->net); |
| 660 | |
| 661 | if ((cmd == RTM_ADD || cmd == RTM_CHANGE) && |
| 662 | (rtm.hdr.rtm_addrs & (RTA_IFP | RTA_IFA))) |
| 663 | { |
| 664 | rtm.hdr.rtm_index = (unsigned short)rt->iface->index; |
| 665 | if (rtm.hdr.rtm_addrs & RTA_IFP) { |
| 666 | if_linkaddr(&su.sdl, rt->iface); |
| 667 | ADDSU; |
| 668 | } |
| 669 | |
| 670 | if (rtm.hdr.rtm_addrs & RTA_IFA) |
| 671 | ADDADDR(&state->addr); |
| 672 | } |
| 673 | |
| 674 | #undef ADDADDR |
| 675 | #undef ADDSU |
| 676 | |
| 677 | rtm.hdr.rtm_msglen = (unsigned short)(bp - (char *)&rtm); |
| 678 | retval = write(s, &rtm, rtm.hdr.rtm_msglen) == -1 ? -1 : 0; |
| 679 | close(s); |
| 680 | return retval; |
| 681 | } |
| 682 | |
| 683 | int |
| 684 | if_initrt(struct interface *ifp) |
| 685 | { |
| 686 | struct rt_msghdr *rtm; |
| 687 | int mib[6]; |
| 688 | size_t needed; |
| 689 | char *buf, *p, *end; |
| 690 | struct rt rt; |
| 691 | |
| 692 | ipv4_freerts(ifp->ctx->ipv4_kroutes); |
| 693 | |
| 694 | mib[0] = CTL_NET; |
| 695 | mib[1] = PF_ROUTE; |
| 696 | mib[2] = 0; |
| 697 | mib[3] = AF_INET; |
| 698 | mib[4] = NET_RT_DUMP; |
| 699 | mib[5] = 0; |
| 700 | |
| 701 | if (sysctl(mib, 6, NULL, &needed, NULL, 0) == -1) |
| 702 | return -1; |
| 703 | if (needed == 0) |
| 704 | return 0; |
| 705 | if ((buf = malloc(needed)) == NULL) |
| 706 | return -1; |
| 707 | if (sysctl(mib, 6, buf, &needed, NULL, 0) == -1) |
| 708 | return -1; |
| 709 | |
| 710 | end = buf + needed; |
| 711 | for (p = buf; p < end; p += rtm->rtm_msglen) { |
| 712 | rtm = (struct rt_msghdr *)(void *)p; |
| 713 | if (if_copyrt(ifp->ctx, &rt, rtm) == 0) |
| 714 | ipv4_handlert(ifp->ctx, RTM_ADD, &rt); |
| 715 | } |
| 716 | free(buf); |
| 717 | return 0; |
| 718 | } |
| 719 | |
| 720 | #ifdef SIOCGIFAFLAG_IN |
| 721 | int |
| 722 | if_addrflags(const struct in_addr *addr, const struct interface *ifp) |
| 723 | { |
| 724 | int s, flags; |
| 725 | struct ifreq ifr; |
| 726 | struct sockaddr_in *sin; |
| 727 | |
| 728 | s = socket(PF_INET, SOCK_DGRAM, 0); |
| 729 | flags = -1; |
| 730 | if (s != -1) { |
| 731 | memset(&ifr, 0, sizeof(ifr)); |
| 732 | strlcpy(ifr.ifr_name, ifp->name, sizeof(ifr.ifr_name)); |
| 733 | sin = (struct sockaddr_in *)(void *)&ifr.ifr_addr; |
| 734 | sin->sin_family = AF_INET; |
| 735 | sin->sin_addr = *addr; |
| 736 | if (ioctl(s, SIOCGIFAFLAG_IN, &ifr) != -1) |
| 737 | flags = ifr.ifr_addrflags; |
| 738 | close(s); |
| 739 | } |
| 740 | return flags; |
| 741 | } |
| 742 | #else |
| 743 | int |
| 744 | if_addrflags(__unused const struct in_addr *addr, |
| 745 | __unused const struct interface *ifp) |
| 746 | { |
| 747 | |
| 748 | errno = ENOTSUP; |
| 749 | return 0; |
| 750 | } |
| 751 | #endif |
| 752 | #endif /* INET */ |
| 753 | |
| 754 | #ifdef INET6 |
| 755 | static void |
| 756 | ifa_scope(struct sockaddr_in6 *sin, unsigned int ifindex) |
| 757 | { |
| 758 | |
| 759 | #ifdef __KAME__ |
| 760 | /* KAME based systems want to store the scope inside the sin6_addr |
| 761 | * for link local addreses */ |
| 762 | if (IN6_IS_ADDR_LINKLOCAL(&sin->sin6_addr)) { |
| 763 | uint16_t scope = htons((uint16_t)ifindex); |
| 764 | memcpy(&sin->sin6_addr.s6_addr[2], &scope, |
| 765 | sizeof(scope)); |
| 766 | } |
| 767 | sin->sin6_scope_id = 0; |
| 768 | #else |
| 769 | if (IN6_IS_ADDR_LINKLOCAL(&sin->sin6_addr)) |
| 770 | sin->sin6_scope_id = ifindex; |
| 771 | else |
| 772 | sin->sin6_scope_id = 0; |
| 773 | #endif |
| 774 | } |
| 775 | |
| 776 | #ifdef __KAME__ |
| 777 | #define DESCOPE(ia6) do { \ |
| 778 | if (IN6_IS_ADDR_LINKLOCAL((ia6))) \ |
| 779 | (ia6)->s6_addr[2] = (ia6)->s6_addr[3] = '\0'; \ |
| 780 | } while (/*CONSTCOND */0) |
| 781 | #else |
| 782 | #define DESCOPE(ia6) |
| 783 | #endif |
| 784 | |
| 785 | int |
| 786 | if_address6(const struct ipv6_addr *a, int action) |
| 787 | { |
| 788 | int s, r; |
| 789 | struct in6_aliasreq ifa; |
| 790 | struct in6_addr mask; |
| 791 | |
| 792 | if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) == -1) |
| 793 | return -1; |
| 794 | |
| 795 | memset(&ifa, 0, sizeof(ifa)); |
| 796 | strlcpy(ifa.ifra_name, a->iface->name, sizeof(ifa.ifra_name)); |
| 797 | /* |
| 798 | * We should not set IN6_IFF_TENTATIVE as the kernel should be |
| 799 | * able to work out if it's a new address or not. |
| 800 | * |
| 801 | * We should set IN6_IFF_AUTOCONF, but the kernel won't let us. |
| 802 | * This is probably a safety measure, but still it's not entirely right |
| 803 | * either. |
| 804 | */ |
| 805 | #if 0 |
| 806 | if (a->autoconf) |
| 807 | ifa.ifra_flags |= IN6_IFF_AUTOCONF; |
| 808 | #endif |
| 809 | #ifdef IPV6_MANGETEMPADDR |
| 810 | if (a->flags & IPV6_AF_TEMPORARY) |
| 811 | ifa.ifra_flags |= IN6_IFF_TEMPORARY; |
| 812 | #endif |
| 813 | |
| 814 | #define ADDADDR(v, addr) { \ |
| 815 | (v)->sin6_family = AF_INET6; \ |
| 816 | (v)->sin6_len = sizeof(*v); \ |
| 817 | (v)->sin6_addr = *addr; \ |
| 818 | } |
| 819 | |
| 820 | ADDADDR(&ifa.ifra_addr, &a->addr); |
| 821 | ifa_scope(&ifa.ifra_addr, a->iface->index); |
| 822 | ipv6_mask(&mask, a->prefix_len); |
| 823 | ADDADDR(&ifa.ifra_prefixmask, &mask); |
| 824 | ifa.ifra_lifetime.ia6t_vltime = a->prefix_vltime; |
| 825 | ifa.ifra_lifetime.ia6t_pltime = a->prefix_pltime; |
| 826 | #undef ADDADDR |
| 827 | |
| 828 | r = ioctl(s, action < 0 ? SIOCDIFADDR_IN6 : SIOCAIFADDR_IN6, &ifa); |
| 829 | close(s); |
| 830 | return r; |
| 831 | } |
| 832 | |
| 833 | |
| 834 | static int |
| 835 | if_copyrt6(struct dhcpcd_ctx *ctx, struct rt6 *rt, struct rt_msghdr *rtm) |
| 836 | { |
| 837 | char *cp; |
| 838 | struct sockaddr *sa, *rti_info[RTAX_MAX]; |
| 839 | |
| 840 | cp = (char *)(void *)(rtm + 1); |
| 841 | sa = (struct sockaddr *)(void *)cp; |
| 842 | if (sa->sa_family != AF_INET6) |
| 843 | return -1; |
| 844 | if (~rtm->rtm_addrs & (RTA_DST | RTA_GATEWAY)) |
| 845 | return -1; |
| 846 | #ifdef RTF_CLONED |
| 847 | if (rtm->rtm_flags & (RTF_CLONED | RTF_HOST)) |
| 848 | return -1; |
| 849 | #else |
| 850 | if (rtm->rtm_flags & RTF_HOST) |
| 851 | return -1; |
| 852 | #endif |
| 853 | #ifdef RTF_LOCAL |
| 854 | if (rtm->rtm_flags & RTF_LOCAL) |
| 855 | return -1; |
| 856 | #endif |
| 857 | |
| 858 | get_addrs(rtm->rtm_addrs, cp, rti_info); |
| 859 | memset(rt, 0, sizeof(*rt)); |
| 860 | rt->flags = (unsigned int)rtm->rtm_flags; |
| 861 | COPYOUT6(rt->dest, rti_info[RTAX_DST]); |
| 862 | if (rtm->rtm_addrs & RTA_NETMASK) { |
| 863 | /* |
| 864 | * We need to zero out the struct beyond sin6_len and |
| 865 | * ensure it's valid. |
| 866 | * I have no idea what the invalid data is for, could be |
| 867 | * a kernel bug or actually used for something. |
| 868 | * Either way it needs to be zeroed out. |
| 869 | */ |
| 870 | struct sockaddr_in6 *sin6; |
| 871 | size_t e, i, len = 0, final = 0; |
| 872 | |
| 873 | sin6 = (struct sockaddr_in6 *)(void *)rti_info[RTAX_NETMASK]; |
| 874 | rt->net = sin6->sin6_addr; |
| 875 | e = sin6->sin6_len - offsetof(struct sockaddr_in6, sin6_addr); |
| 876 | if (e > sizeof(struct in6_addr)) |
| 877 | e = sizeof(struct in6_addr); |
| 878 | for (i = 0; i < e; i++) { |
| 879 | switch (rt->net.s6_addr[i] & 0xff) { |
| 880 | case 0xff: |
| 881 | /* We don't really want the length, |
| 882 | * just that it's valid */ |
| 883 | len++; |
| 884 | break; |
| 885 | case 0xfe: |
| 886 | case 0xfc: |
| 887 | case 0xf8: |
| 888 | case 0xf0: |
| 889 | case 0xe0: |
| 890 | case 0xc0: |
| 891 | case 0x80: |
| 892 | len++; |
| 893 | final = 1; |
| 894 | break; |
| 895 | default: |
| 896 | rt->net.s6_addr[i] = 0x00; |
| 897 | final = 1; |
| 898 | break; |
| 899 | } |
| 900 | if (final) |
| 901 | break; |
| 902 | } |
| 903 | if (len == 0) |
| 904 | i = 0; |
| 905 | while (i < sizeof(rt->net.s6_addr)) |
| 906 | rt->net.s6_addr[i++] = 0x00; |
| 907 | } else |
| 908 | ipv6_mask(&rt->net, 128); |
| 909 | COPYOUT6(rt->gate, rti_info[RTAX_GATEWAY]); |
| 910 | |
| 911 | if (rtm->rtm_index) |
| 912 | rt->iface = if_findindex(ctx->ifaces, rtm->rtm_index); |
| 913 | else if (rtm->rtm_addrs & RTA_IFP) { |
| 914 | struct sockaddr_dl *sdl; |
| 915 | |
| 916 | sdl = (struct sockaddr_dl *)(void *)rti_info[RTAX_IFP]; |
| 917 | rt->iface = if_findsdl(ctx, sdl); |
| 918 | } |
| 919 | /* If we don't have an interface and it's a host route, it maybe |
| 920 | * to a local ip via the loopback interface. */ |
| 921 | if (rt->iface == NULL && |
| 922 | !(~rtm->rtm_flags & (RTF_HOST | RTF_GATEWAY))) |
| 923 | { |
| 924 | struct ipv6_addr *ia; |
| 925 | |
| 926 | if ((ia = ipv6_findaddr(ctx, &rt->dest, 0))) |
| 927 | rt->iface = ia->iface; |
| 928 | } |
| 929 | |
| 930 | return 0; |
| 931 | } |
| 932 | |
| 933 | int |
| 934 | if_route6(unsigned char cmd, const struct rt6 *rt) |
| 935 | { |
| 936 | union sockunion { |
| 937 | struct sockaddr sa; |
| 938 | struct sockaddr_in6 sin; |
| 939 | struct sockaddr_dl sdl; |
| 940 | } su; |
| 941 | struct rtm |
| 942 | { |
| 943 | struct rt_msghdr hdr; |
| 944 | char buffer[sizeof(su) * RTAX_MAX]; |
| 945 | } rtm; |
| 946 | char *bp = rtm.buffer; |
| 947 | size_t l; |
| 948 | int s, retval; |
| 949 | |
| 950 | if ((s = socket(PF_ROUTE, SOCK_RAW, 0)) == -1) |
| 951 | return -1; |
| 952 | |
| 953 | #define ADDSU { \ |
| 954 | l = RT_ROUNDUP(su.sa.sa_len); \ |
| 955 | memcpy(bp, &su, l); \ |
| 956 | bp += l; \ |
| 957 | } |
| 958 | #define ADDADDRS(addr, scope) { \ |
| 959 | memset(&su, 0, sizeof(su)); \ |
| 960 | su.sin.sin6_family = AF_INET6; \ |
| 961 | su.sin.sin6_len = sizeof(su.sin); \ |
| 962 | (&su.sin)->sin6_addr = *addr; \ |
| 963 | if (scope) \ |
| 964 | ifa_scope(&su.sin, scope); \ |
| 965 | ADDSU; \ |
| 966 | } |
| 967 | #define ADDADDR(addr) ADDADDRS(addr, 0) |
| 968 | |
| 969 | memset(&rtm, 0, sizeof(rtm)); |
| 970 | rtm.hdr.rtm_version = RTM_VERSION; |
| 971 | rtm.hdr.rtm_seq = 1; |
| 972 | rtm.hdr.rtm_type = cmd; |
| 973 | rtm.hdr.rtm_flags = RTF_UP | (int)rt->flags; |
| 974 | #ifdef RTF_PINNED |
| 975 | if (rtm.hdr.rtm_type != RTM_ADD) |
| 976 | rtm.hdr.rtm_flags |= RTF_PINNED; |
| 977 | #endif |
| 978 | rtm.hdr.rtm_addrs = RTA_DST | RTA_NETMASK; |
| 979 | /* None interface subnet routes are static. */ |
| 980 | if (IN6_IS_ADDR_UNSPECIFIED(&rt->gate)) { |
| 981 | #ifdef RTF_CLONING |
| 982 | rtm.hdr.rtm_flags |= RTF_CLONING; |
| 983 | #endif |
| 984 | #ifdef RTP_CONNECTED |
| 985 | rtm.hdr.rtm_priority = RTP_CONNECTED; |
| 986 | #endif |
| 987 | } else |
| 988 | rtm.hdr.rtm_flags |= RTF_GATEWAY | RTF_STATIC; |
| 989 | |
| 990 | if (cmd == RTM_ADD) |
| 991 | rtm.hdr.rtm_addrs |= RTA_GATEWAY; |
| 992 | if (cmd == RTM_ADD && !(rtm.hdr.rtm_flags & RTF_REJECT)) |
| 993 | rtm.hdr.rtm_addrs |= RTA_IFP | RTA_IFA; |
| 994 | |
| 995 | ADDADDR(&rt->dest); |
| 996 | if (rtm.hdr.rtm_addrs & RTA_GATEWAY) { |
| 997 | if (IN6_IS_ADDR_UNSPECIFIED(&rt->gate)) { |
| 998 | if_linkaddr(&su.sdl, rt->iface); |
| 999 | ADDSU; |
| 1000 | } else { |
| 1001 | ADDADDRS(&rt->gate, rt->iface->index); |
| 1002 | } |
| 1003 | } |
| 1004 | |
| 1005 | if (rtm.hdr.rtm_addrs & RTA_NETMASK) |
| 1006 | ADDADDR(&rt->net); |
| 1007 | |
| 1008 | if ((cmd == RTM_ADD || cmd == RTM_CHANGE) && |
| 1009 | (rtm.hdr.rtm_addrs & (RTA_IFP | RTA_IFA))) |
| 1010 | { |
| 1011 | rtm.hdr.rtm_index = (unsigned short)rt->iface->index; |
| 1012 | if (rtm.hdr.rtm_addrs & RTA_IFP) { |
| 1013 | if_linkaddr(&su.sdl, rt->iface); |
| 1014 | ADDSU; |
| 1015 | } |
| 1016 | |
| 1017 | if (rtm.hdr.rtm_addrs & RTA_IFA) { |
| 1018 | const struct ipv6_addr *lla; |
| 1019 | |
| 1020 | lla = ipv6_linklocal(rt->iface); |
| 1021 | if (lla == NULL) /* unlikely */ |
| 1022 | return -1; |
| 1023 | ADDADDRS(&lla->addr, rt->iface->index); |
| 1024 | } |
| 1025 | |
| 1026 | if (rt->mtu) { |
| 1027 | rtm.hdr.rtm_inits |= RTV_MTU; |
| 1028 | rtm.hdr.rtm_rmx.rmx_mtu = rt->mtu; |
| 1029 | } |
| 1030 | } |
| 1031 | |
| 1032 | #undef ADDADDR |
| 1033 | #undef ADDSU |
| 1034 | |
| 1035 | rtm.hdr.rtm_msglen = (unsigned short)(bp - (char *)&rtm); |
| 1036 | retval = write(s, &rtm, rtm.hdr.rtm_msglen) == -1 ? -1 : 0; |
| 1037 | close(s); |
| 1038 | return retval; |
| 1039 | } |
| 1040 | |
| 1041 | int |
| 1042 | if_initrt6(struct interface *ifp) |
| 1043 | { |
| 1044 | struct rt_msghdr *rtm; |
| 1045 | int mib[6]; |
| 1046 | size_t needed; |
| 1047 | char *buf, *p, *end; |
| 1048 | struct rt6 rt; |
| 1049 | |
| 1050 | ipv6_freerts(&ifp->ctx->ipv6->kroutes); |
| 1051 | |
| 1052 | mib[0] = CTL_NET; |
| 1053 | mib[1] = PF_ROUTE; |
| 1054 | mib[2] = 0; |
| 1055 | mib[3] = AF_INET6; |
| 1056 | mib[4] = NET_RT_DUMP; |
| 1057 | mib[5] = 0; |
| 1058 | |
| 1059 | if (sysctl(mib, 6, NULL, &needed, NULL, 0) == -1) |
| 1060 | return -1; |
| 1061 | if (needed == 0) |
| 1062 | return 0; |
| 1063 | if ((buf = malloc(needed)) == NULL) |
| 1064 | return -1; |
| 1065 | if (sysctl(mib, 6, buf, &needed, NULL, 0) == -1) |
| 1066 | return -1; |
| 1067 | |
| 1068 | end = buf + needed; |
| 1069 | for (p = buf; p < end; p += rtm->rtm_msglen) { |
| 1070 | rtm = (struct rt_msghdr *)(void *)p; |
| 1071 | if (if_copyrt6(ifp->ctx, &rt, rtm) == 0) |
| 1072 | ipv6_handlert(ifp->ctx, RTM_ADD, &rt); |
| 1073 | } |
| 1074 | free(buf); |
| 1075 | return 0; |
| 1076 | } |
| 1077 | |
| 1078 | int |
| 1079 | if_addrflags6(const struct in6_addr *addr, const struct interface *ifp) |
| 1080 | { |
| 1081 | int s, flags; |
| 1082 | struct in6_ifreq ifr6; |
| 1083 | |
| 1084 | s = socket(PF_INET6, SOCK_DGRAM, 0); |
| 1085 | flags = -1; |
| 1086 | if (s != -1) { |
| 1087 | memset(&ifr6, 0, sizeof(ifr6)); |
| 1088 | strlcpy(ifr6.ifr_name, ifp->name, sizeof(ifr6.ifr_name)); |
| 1089 | ifr6.ifr_addr.sin6_family = AF_INET6; |
| 1090 | ifr6.ifr_addr.sin6_addr = *addr; |
| 1091 | ifa_scope(&ifr6.ifr_addr, ifp->index); |
| 1092 | if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) != -1) |
| 1093 | flags = ifr6.ifr_ifru.ifru_flags6; |
| 1094 | close(s); |
| 1095 | } |
| 1096 | return flags; |
| 1097 | } |
| 1098 | |
| 1099 | int |
| 1100 | if_getlifetime6(struct ipv6_addr *ia) |
| 1101 | { |
| 1102 | int s, r; |
| 1103 | struct in6_ifreq ifr6; |
| 1104 | |
| 1105 | s = socket(PF_INET6, SOCK_DGRAM, 0); |
| 1106 | r = -1; |
| 1107 | if (s != -1) { |
| 1108 | memset(&ifr6, 0, sizeof(ifr6)); |
| 1109 | strlcpy(ifr6.ifr_name, ia->iface->name, sizeof(ifr6.ifr_name)); |
| 1110 | ifr6.ifr_addr.sin6_family = AF_INET6; |
| 1111 | ifr6.ifr_addr.sin6_addr = ia->addr; |
| 1112 | ifa_scope(&ifr6.ifr_addr, ia->iface->index); |
| 1113 | if (ioctl(s, SIOCGIFALIFETIME_IN6, &ifr6) != -1) { |
| 1114 | time_t t; |
| 1115 | struct in6_addrlifetime *lifetime; |
| 1116 | |
| 1117 | t = time(NULL); |
| 1118 | lifetime = &ifr6.ifr_ifru.ifru_lifetime; |
| 1119 | |
| 1120 | if (lifetime->ia6t_preferred) |
| 1121 | ia->prefix_pltime = |
| 1122 | (uint32_t)(lifetime->ia6t_preferred - |
| 1123 | MIN(t, lifetime->ia6t_preferred)); |
| 1124 | else |
| 1125 | ia->prefix_pltime = ND6_INFINITE_LIFETIME; |
| 1126 | if (lifetime->ia6t_expire) { |
| 1127 | ia->prefix_vltime = |
| 1128 | (uint32_t)(lifetime->ia6t_expire - |
| 1129 | MIN(t, lifetime->ia6t_expire)); |
| 1130 | /* Calculate the created time */ |
| 1131 | get_monotonic(&ia->created); |
| 1132 | ia->created.tv_sec -= |
| 1133 | lifetime->ia6t_vltime - ia->prefix_vltime; |
| 1134 | } else |
| 1135 | ia->prefix_vltime = ND6_INFINITE_LIFETIME; |
| 1136 | |
| 1137 | r = 0; |
| 1138 | } |
| 1139 | close(s); |
| 1140 | } |
| 1141 | return r; |
| 1142 | } |
| 1143 | #endif |
| 1144 | |
| 1145 | int |
| 1146 | if_managelink(struct dhcpcd_ctx *ctx) |
| 1147 | { |
| 1148 | /* route and ifwatchd like a msg buf size of 2048 */ |
| 1149 | char msg[2048], *p, *e, *cp; |
| 1150 | ssize_t bytes; |
| 1151 | struct rt_msghdr *rtm; |
| 1152 | struct if_announcemsghdr *ifan; |
| 1153 | struct if_msghdr *ifm; |
| 1154 | struct ifa_msghdr *ifam; |
| 1155 | struct sockaddr *sa, *rti_info[RTAX_MAX]; |
| 1156 | int len; |
| 1157 | struct sockaddr_dl sdl; |
| 1158 | struct interface *ifp; |
| 1159 | #ifdef INET |
| 1160 | struct rt rt; |
| 1161 | #endif |
| 1162 | #ifdef INET6 |
| 1163 | struct rt6 rt6; |
| 1164 | struct in6_addr ia6, net6; |
| 1165 | struct sockaddr_in6 *sin6; |
| 1166 | #endif |
| 1167 | #if (defined(INET) && defined(IN_IFF_TENTATIVE)) || defined(INET6) |
| 1168 | int ifa_flags; |
| 1169 | #endif |
| 1170 | |
| 1171 | if ((bytes = read(ctx->link_fd, msg, sizeof(msg))) == -1) |
| 1172 | return -1; |
| 1173 | e = msg + bytes; |
| 1174 | for (p = msg; p < e; p += rtm->rtm_msglen) { |
| 1175 | rtm = (struct rt_msghdr *)(void *)p; |
| 1176 | // Ignore messages generated by us |
| 1177 | if (rtm->rtm_pid == getpid()) |
| 1178 | break; |
| 1179 | switch(rtm->rtm_type) { |
| 1180 | #ifdef RTM_IFANNOUNCE |
| 1181 | case RTM_IFANNOUNCE: |
| 1182 | ifan = (struct if_announcemsghdr *)(void *)p; |
| 1183 | switch(ifan->ifan_what) { |
| 1184 | case IFAN_ARRIVAL: |
| 1185 | dhcpcd_handleinterface(ctx, 1, |
| 1186 | ifan->ifan_name); |
| 1187 | break; |
| 1188 | case IFAN_DEPARTURE: |
| 1189 | dhcpcd_handleinterface(ctx, -1, |
| 1190 | ifan->ifan_name); |
| 1191 | break; |
| 1192 | } |
| 1193 | break; |
| 1194 | #endif |
| 1195 | case RTM_IFINFO: |
| 1196 | ifm = (struct if_msghdr *)(void *)p; |
| 1197 | ifp = if_findindex(ctx->ifaces, ifm->ifm_index); |
| 1198 | if (ifp == NULL) |
| 1199 | break; |
| 1200 | switch (ifm->ifm_data.ifi_link_state) { |
| 1201 | case LINK_STATE_DOWN: |
| 1202 | len = LINK_DOWN; |
| 1203 | break; |
| 1204 | case LINK_STATE_UP: |
| 1205 | len = LINK_UP; |
| 1206 | break; |
| 1207 | default: |
| 1208 | /* handle_carrier will re-load |
| 1209 | * the interface flags and check for |
| 1210 | * IFF_RUNNING as some drivers that |
| 1211 | * don't handle link state also don't |
| 1212 | * set IFF_RUNNING when this routing |
| 1213 | * message is generated. |
| 1214 | * As such, it is a race ...*/ |
| 1215 | len = LINK_UNKNOWN; |
| 1216 | break; |
| 1217 | } |
| 1218 | dhcpcd_handlecarrier(ctx, len, |
| 1219 | (unsigned int)ifm->ifm_flags, ifp->name); |
| 1220 | break; |
| 1221 | case RTM_ADD: |
| 1222 | case RTM_CHANGE: |
| 1223 | case RTM_DELETE: |
| 1224 | cp = (char *)(void *)(rtm + 1); |
| 1225 | sa = (struct sockaddr *)(void *)cp; |
| 1226 | switch (sa->sa_family) { |
| 1227 | #ifdef INET |
| 1228 | case AF_INET: |
| 1229 | if (if_copyrt(ctx, &rt, rtm) == 0) |
| 1230 | ipv4_handlert(ctx, rtm->rtm_type, &rt); |
| 1231 | break; |
| 1232 | #endif |
| 1233 | #ifdef INET6 |
| 1234 | case AF_INET6: |
| 1235 | if (~rtm->rtm_addrs & (RTA_DST | RTA_GATEWAY)) |
| 1236 | break; |
| 1237 | /* |
| 1238 | * BSD caches host routes in the |
| 1239 | * routing table. |
| 1240 | * As such, we should be notified of |
| 1241 | * reachability by its existance |
| 1242 | * with a hardware address |
| 1243 | */ |
| 1244 | if (rtm->rtm_flags & (RTF_HOST)) { |
| 1245 | get_addrs(rtm->rtm_addrs, cp, rti_info); |
| 1246 | COPYOUT6(ia6, rti_info[RTAX_DST]); |
| 1247 | DESCOPE(&ia6); |
| 1248 | if (rti_info[RTAX_GATEWAY]->sa_family |
| 1249 | == AF_LINK) |
| 1250 | memcpy(&sdl, |
| 1251 | rti_info[RTAX_GATEWAY], |
| 1252 | sizeof(sdl)); |
| 1253 | else |
| 1254 | sdl.sdl_alen = 0; |
| 1255 | ipv6nd_neighbour(ctx, &ia6, |
| 1256 | rtm->rtm_type != RTM_DELETE && |
| 1257 | sdl.sdl_alen ? |
| 1258 | IPV6ND_REACHABLE : 0); |
| 1259 | break; |
| 1260 | } |
| 1261 | |
| 1262 | if (if_copyrt6(ctx, &rt6, rtm) == 0) |
| 1263 | ipv6_handlert(ctx, rtm->rtm_type, &rt6); |
| 1264 | break; |
| 1265 | #endif |
| 1266 | } |
| 1267 | break; |
| 1268 | #ifdef RTM_CHGADDR |
| 1269 | case RTM_CHGADDR: /* FALLTHROUGH */ |
| 1270 | #endif |
| 1271 | case RTM_DELADDR: /* FALLTHROUGH */ |
| 1272 | case RTM_NEWADDR: |
| 1273 | ifam = (struct ifa_msghdr *)(void *)p; |
| 1274 | ifp = if_findindex(ctx->ifaces, ifam->ifam_index); |
| 1275 | if (ifp == NULL) |
| 1276 | break; |
| 1277 | cp = (char *)(void *)(ifam + 1); |
| 1278 | get_addrs(ifam->ifam_addrs, cp, rti_info); |
| 1279 | if (rti_info[RTAX_IFA] == NULL) |
| 1280 | break; |
| 1281 | switch (rti_info[RTAX_IFA]->sa_family) { |
| 1282 | case AF_LINK: |
| 1283 | #ifdef RTM_CHGADDR |
| 1284 | if (rtm->rtm_type != RTM_CHGADDR) |
| 1285 | break; |
| 1286 | #else |
| 1287 | if (rtm->rtm_type != RTM_NEWADDR) |
| 1288 | break; |
| 1289 | #endif |
| 1290 | memcpy(&sdl, rti_info[RTAX_IFA], |
| 1291 | rti_info[RTAX_IFA]->sa_len); |
| 1292 | dhcpcd_handlehwaddr(ctx, ifp->name, |
| 1293 | (const unsigned char*)CLLADDR(&sdl), |
| 1294 | sdl.sdl_alen); |
| 1295 | break; |
| 1296 | #ifdef INET |
| 1297 | case AF_INET: |
| 1298 | case 255: /* FIXME: Why 255? */ |
| 1299 | COPYOUT(rt.dest, rti_info[RTAX_IFA]); |
| 1300 | COPYOUT(rt.net, rti_info[RTAX_NETMASK]); |
| 1301 | COPYOUT(rt.gate, rti_info[RTAX_BRD]); |
| 1302 | if (rtm->rtm_type == RTM_NEWADDR) { |
| 1303 | ifa_flags = if_addrflags(&rt.dest, ifp); |
| 1304 | if (ifa_flags == -1) |
| 1305 | break; |
| 1306 | } else |
| 1307 | ifa_flags = 0; |
| 1308 | ipv4_handleifa(ctx, rtm->rtm_type, |
| 1309 | NULL, ifp->name, |
| 1310 | &rt.dest, &rt.net, &rt.gate, ifa_flags); |
| 1311 | break; |
| 1312 | #endif |
| 1313 | #ifdef INET6 |
| 1314 | case AF_INET6: |
| 1315 | sin6 = (struct sockaddr_in6*)(void *) |
| 1316 | rti_info[RTAX_IFA]; |
| 1317 | ia6 = sin6->sin6_addr; |
| 1318 | DESCOPE(&ia6); |
| 1319 | sin6 = (struct sockaddr_in6*)(void *) |
| 1320 | rti_info[RTAX_NETMASK]; |
| 1321 | net6 = sin6->sin6_addr; |
| 1322 | DESCOPE(&net6); |
| 1323 | if (rtm->rtm_type == RTM_NEWADDR) { |
| 1324 | ifa_flags = if_addrflags6(&ia6, ifp); |
| 1325 | if (ifa_flags == -1) |
| 1326 | break; |
| 1327 | } else |
| 1328 | ifa_flags = 0; |
| 1329 | ipv6_handleifa(ctx, rtm->rtm_type, NULL, |
| 1330 | ifp->name, &ia6, ipv6_prefixlen(&net6), |
| 1331 | ifa_flags); |
| 1332 | break; |
| 1333 | #endif |
| 1334 | } |
| 1335 | break; |
| 1336 | } |
| 1337 | } |
| 1338 | return 0; |
| 1339 | } |
| 1340 | |
| 1341 | #ifndef SYS_NMLN /* OSX */ |
| 1342 | # define SYS_NMLN 256 |
| 1343 | #endif |
| 1344 | #ifndef HW_MACHINE_ARCH |
| 1345 | # ifdef HW_MODEL /* OpenBSD */ |
| 1346 | # define HW_MACHINE_ARCH HW_MODEL |
| 1347 | # endif |
| 1348 | #endif |
| 1349 | int |
| 1350 | if_machinearch(char *str, size_t len) |
| 1351 | { |
| 1352 | int mib[2] = { CTL_HW, HW_MACHINE_ARCH }; |
| 1353 | char march[SYS_NMLN]; |
| 1354 | size_t marchlen = sizeof(march); |
| 1355 | |
| 1356 | if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), |
| 1357 | march, &marchlen, NULL, 0) != 0) |
| 1358 | return -1; |
| 1359 | return snprintf(str, len, ":%s", march); |
| 1360 | } |
| 1361 | |
| 1362 | #ifdef INET6 |
| 1363 | #ifdef IPV6CTL_ACCEPT_RTADV |
| 1364 | #define get_inet6_sysctl(code) inet6_sysctl(code, 0, 0) |
| 1365 | #define set_inet6_sysctl(code, val) inet6_sysctl(code, val, 1) |
| 1366 | static int |
| 1367 | inet6_sysctl(int code, int val, int action) |
| 1368 | { |
| 1369 | int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 }; |
| 1370 | size_t size; |
| 1371 | |
| 1372 | mib[3] = code; |
| 1373 | size = sizeof(val); |
| 1374 | if (action) { |
| 1375 | if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), |
| 1376 | NULL, 0, &val, size) == -1) |
| 1377 | return -1; |
| 1378 | return 0; |
| 1379 | } |
| 1380 | if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &val, &size, NULL, 0) == -1) |
| 1381 | return -1; |
| 1382 | return val; |
| 1383 | } |
| 1384 | #endif |
| 1385 | |
| 1386 | #ifdef IPV6_MANAGETEMPADDR |
| 1387 | #ifndef IPV6CTL_TEMPVLTIME |
| 1388 | #define get_inet6_sysctlbyname(code) inet6_sysctlbyname(code, 0, 0) |
| 1389 | #define set_inet6_sysctlbyname(code, val) inet6_sysctlbyname(code, val, 1) |
| 1390 | static int |
| 1391 | inet6_sysctlbyname(const char *name, int val, int action) |
| 1392 | { |
| 1393 | size_t size; |
| 1394 | |
| 1395 | size = sizeof(val); |
| 1396 | if (action) { |
| 1397 | if (sysctlbyname(name, NULL, 0, &val, size) == -1) |
| 1398 | return -1; |
| 1399 | return 0; |
| 1400 | } |
| 1401 | if (sysctlbyname(name, &val, &size, NULL, 0) == -1) |
| 1402 | return -1; |
| 1403 | return val; |
| 1404 | } |
| 1405 | #endif |
| 1406 | |
| 1407 | int |
| 1408 | ip6_use_tempaddr(__unused const char *ifname) |
| 1409 | { |
| 1410 | int val; |
| 1411 | |
| 1412 | #ifdef IPV6CTL_USETEMPADDR |
| 1413 | val = get_inet6_sysctl(IPV6CTL_USETEMPADDR); |
| 1414 | #else |
| 1415 | val = get_inet6_sysctlbyname("net.inet6.ip6.use_tempaddr"); |
| 1416 | #endif |
| 1417 | return val == -1 ? 0 : val; |
| 1418 | } |
| 1419 | |
| 1420 | int |
| 1421 | ip6_temp_preferred_lifetime(__unused const char *ifname) |
| 1422 | { |
| 1423 | int val; |
| 1424 | |
| 1425 | #ifdef IPV6CTL_TEMPPLTIME |
| 1426 | val = get_inet6_sysctl(IPV6CTL_TEMPPLTIME); |
| 1427 | #else |
| 1428 | val = get_inet6_sysctlbyname("net.inet6.ip6.temppltime"); |
| 1429 | #endif |
| 1430 | return val < 0 ? TEMP_PREFERRED_LIFETIME : val; |
| 1431 | } |
| 1432 | |
| 1433 | int |
| 1434 | ip6_temp_valid_lifetime(__unused const char *ifname) |
| 1435 | { |
| 1436 | int val; |
| 1437 | |
| 1438 | #ifdef IPV6CTL_TEMPVLTIME |
| 1439 | val = get_inet6_sysctl(IPV6CTL_TEMPVLTIME); |
| 1440 | #else |
| 1441 | val = get_inet6_sysctlbyname("net.inet6.ip6.tempvltime"); |
| 1442 | #endif |
| 1443 | return val < 0 ? TEMP_VALID_LIFETIME : val; |
| 1444 | } |
| 1445 | #endif |
| 1446 | |
| 1447 | #define del_if_nd6_flag(s, ifname, flag) if_nd6_flag((s), (ifp), (flag), -1) |
| 1448 | #define get_if_nd6_flag(s, ifname, flag) if_nd6_flag((s), (ifp), (flag), 0) |
| 1449 | #define set_if_nd6_flag(s, ifname, flag) if_nd6_flag((s), (ifp), (flag), 1) |
| 1450 | static int |
| 1451 | if_nd6_flag(int s, const struct interface *ifp, unsigned int flag, int set) |
| 1452 | { |
| 1453 | struct in6_ndireq nd; |
| 1454 | unsigned int oflags; |
| 1455 | |
| 1456 | memset(&nd, 0, sizeof(nd)); |
| 1457 | strlcpy(nd.ifname, ifp->name, sizeof(nd.ifname)); |
| 1458 | if (ioctl(s, SIOCGIFINFO_IN6, &nd) == -1) |
| 1459 | return -1; |
| 1460 | if (set == 0) |
| 1461 | return nd.ndi.flags & flag ? 1 : 0; |
| 1462 | |
| 1463 | oflags = nd.ndi.flags; |
| 1464 | if (set == -1) |
| 1465 | nd.ndi.flags &= ~flag; |
| 1466 | else |
| 1467 | nd.ndi.flags |= flag; |
| 1468 | if (oflags == nd.ndi.flags) |
| 1469 | return 0; |
| 1470 | return ioctl(s, SIOCSIFINFO_FLAGS, &nd); |
| 1471 | } |
| 1472 | |
| 1473 | static int |
| 1474 | if_raflush(int s) |
| 1475 | { |
| 1476 | char dummy[IFNAMSIZ + 8]; |
| 1477 | |
| 1478 | strlcpy(dummy, "lo0", sizeof(dummy)); |
| 1479 | if (ioctl(s, SIOCSRTRFLUSH_IN6, (void *)&dummy) == -1 || |
| 1480 | ioctl(s, SIOCSPFXFLUSH_IN6, (void *)&dummy) == -1) |
| 1481 | return -1; |
| 1482 | return 0; |
| 1483 | } |
| 1484 | |
| 1485 | #ifdef SIOCIFAFATTACH |
| 1486 | static int |
| 1487 | af_attach(int s, const struct interface *ifp, int af) |
| 1488 | { |
| 1489 | struct if_afreq ifar; |
| 1490 | |
| 1491 | strlcpy(ifar.ifar_name, ifp->name, sizeof(ifar.ifar_name)); |
| 1492 | ifar.ifar_af = af; |
| 1493 | return ioctl(s, SIOCIFAFATTACH, (void *)&ifar); |
| 1494 | } |
| 1495 | #endif |
| 1496 | |
| 1497 | #ifdef SIOCGIFXFLAGS |
| 1498 | static int |
| 1499 | set_ifxflags(int s, const struct interface *ifp, int own) |
| 1500 | { |
| 1501 | struct ifreq ifr; |
| 1502 | int flags; |
| 1503 | |
| 1504 | #ifndef IFXF_NOINET6 |
| 1505 | /* No point in removing the no inet6 flag if it doesn't |
| 1506 | * exist and we're not owning inet6. */ |
| 1507 | if (! own) |
| 1508 | return 0; |
| 1509 | #endif |
| 1510 | |
| 1511 | strlcpy(ifr.ifr_name, ifp->name, sizeof(ifr.ifr_name)); |
| 1512 | if (ioctl(s, SIOCGIFXFLAGS, (void *)&ifr) == -1) |
| 1513 | return -1; |
| 1514 | flags = ifr.ifr_flags; |
| 1515 | #ifdef IFXF_NOINET6 |
| 1516 | flags &= ~IFXF_NOINET6; |
| 1517 | #endif |
| 1518 | if (own) |
| 1519 | flags &= ~IFXF_AUTOCONF6; |
| 1520 | if (ifr.ifr_flags == flags) |
| 1521 | return 0; |
| 1522 | ifr.ifr_flags = flags; |
| 1523 | return ioctl(s, SIOCSIFXFLAGS, (void *)&ifr); |
| 1524 | } |
| 1525 | #endif |
| 1526 | |
| 1527 | static int |
| 1528 | _if_checkipv6(int s, struct dhcpcd_ctx *ctx, |
| 1529 | const struct interface *ifp, int own) |
| 1530 | { |
| 1531 | int ra; |
| 1532 | |
| 1533 | if (ifp) { |
| 1534 | #ifdef ND6_IFF_OVERRIDE_RTADV |
| 1535 | int override; |
| 1536 | #endif |
| 1537 | |
| 1538 | #ifdef ND6_IFF_IFDISABLED |
| 1539 | if (del_if_nd6_flag(s, ifp, ND6_IFF_IFDISABLED) == -1) { |
| 1540 | logger(ifp->ctx, LOG_ERR, |
| 1541 | "%s: del_if_nd6_flag: ND6_IFF_IFDISABLED: %m", |
| 1542 | ifp->name); |
| 1543 | return -1; |
| 1544 | } |
| 1545 | #endif |
| 1546 | |
| 1547 | #ifdef ND6_IFF_PERFORMNUD |
| 1548 | if (set_if_nd6_flag(s, ifp, ND6_IFF_PERFORMNUD) == -1) { |
| 1549 | logger(ifp->ctx, LOG_ERR, |
| 1550 | "%s: set_if_nd6_flag: ND6_IFF_PERFORMNUD: %m", |
| 1551 | ifp->name); |
| 1552 | return -1; |
| 1553 | } |
| 1554 | #endif |
| 1555 | |
| 1556 | #ifdef ND6_IFF_AUTO_LINKLOCAL |
| 1557 | if (own) { |
| 1558 | int all; |
| 1559 | |
| 1560 | all = get_if_nd6_flag(s, ifp, ND6_IFF_AUTO_LINKLOCAL); |
| 1561 | if (all == -1) |
| 1562 | logger(ifp->ctx, LOG_ERR, |
| 1563 | "%s: get_if_nd6_flag: " |
| 1564 | "ND6_IFF_AUTO_LINKLOCAL: %m", |
| 1565 | ifp->name); |
| 1566 | else if (all != 0) { |
| 1567 | logger(ifp->ctx, LOG_DEBUG, |
| 1568 | "%s: disabling Kernel IPv6 " |
| 1569 | "auto link-local support", |
| 1570 | ifp->name); |
| 1571 | if (del_if_nd6_flag(s, ifp, |
| 1572 | ND6_IFF_AUTO_LINKLOCAL) == -1) |
| 1573 | { |
| 1574 | logger(ifp->ctx, LOG_ERR, |
| 1575 | "%s: del_if_nd6_flag: " |
| 1576 | "ND6_IFF_AUTO_LINKLOCAL: %m", |
| 1577 | ifp->name); |
| 1578 | return -1; |
| 1579 | } |
| 1580 | } |
| 1581 | } |
| 1582 | #endif |
| 1583 | |
| 1584 | #ifdef SIOCIFAFATTACH |
| 1585 | if (af_attach(s, ifp, AF_INET6) == -1) { |
| 1586 | logger(ifp->ctx, LOG_ERR, |
| 1587 | "%s: af_attach: %m", ifp->name); |
| 1588 | return 1; |
| 1589 | } |
| 1590 | #endif |
| 1591 | |
| 1592 | #ifdef SIOCGIFXFLAGS |
| 1593 | if (set_ifxflags(s, ifp, own) == -1) { |
| 1594 | logger(ifp->ctx, LOG_ERR, |
| 1595 | "%s: set_ifxflags: %m", ifp->name); |
| 1596 | return -1; |
| 1597 | } |
| 1598 | #endif |
| 1599 | |
| 1600 | #ifdef ND6_IFF_OVERRIDE_RTADV |
| 1601 | override = get_if_nd6_flag(s, ifp, ND6_IFF_OVERRIDE_RTADV); |
| 1602 | if (override == -1) |
| 1603 | logger(ifp->ctx, LOG_ERR, |
| 1604 | "%s: get_if_nd6_flag: ND6_IFF_OVERRIDE_RTADV: %m", |
| 1605 | ifp->name); |
| 1606 | else if (override == 0 && own) { |
| 1607 | if (set_if_nd6_flag(s, ifp, ND6_IFF_OVERRIDE_RTADV) |
| 1608 | == -1) |
| 1609 | logger(ifp->ctx, LOG_ERR, |
| 1610 | "%s: set_if_nd6_flag: " |
| 1611 | "ND6_IFF_OVERRIDE_RTADV: %m", |
| 1612 | ifp->name); |
| 1613 | else |
| 1614 | override = 1; |
| 1615 | } |
| 1616 | #endif |
| 1617 | |
| 1618 | #ifdef ND6_IFF_ACCEPT_RTADV |
| 1619 | ra = get_if_nd6_flag(s, ifp, ND6_IFF_ACCEPT_RTADV); |
| 1620 | if (ra == -1) |
| 1621 | logger(ifp->ctx, LOG_ERR, |
| 1622 | "%s: get_if_nd6_flag: ND6_IFF_ACCEPT_RTADV: %m", |
| 1623 | ifp->name); |
| 1624 | else if (ra != 0 && own) { |
| 1625 | logger(ifp->ctx, LOG_DEBUG, |
| 1626 | "%s: disabling Kernel IPv6 RA support", |
| 1627 | ifp->name); |
| 1628 | if (del_if_nd6_flag(s, ifp, ND6_IFF_ACCEPT_RTADV) |
| 1629 | == -1) |
| 1630 | logger(ifp->ctx, LOG_ERR, |
| 1631 | "%s: del_if_nd6_flag: " |
| 1632 | "ND6_IFF_ACCEPT_RTADV: %m", |
| 1633 | ifp->name); |
| 1634 | else |
| 1635 | ra = 0; |
| 1636 | } else if (ra == 0 && !own) |
| 1637 | logger(ifp->ctx, LOG_WARNING, |
| 1638 | "%s: IPv6 kernel autoconf disabled", ifp->name); |
| 1639 | #ifdef ND6_IFF_OVERRIDE_RTADV |
| 1640 | if (override == 0 && ra) |
| 1641 | return ctx->ra_global; |
| 1642 | #endif |
| 1643 | return ra; |
| 1644 | #else |
| 1645 | return ctx->ra_global; |
| 1646 | #endif |
| 1647 | } |
| 1648 | |
| 1649 | #ifdef IPV6CTL_ACCEPT_RTADV |
| 1650 | ra = get_inet6_sysctl(IPV6CTL_ACCEPT_RTADV); |
| 1651 | if (ra == -1) |
| 1652 | /* The sysctl probably doesn't exist, but this isn't an |
| 1653 | * error as such so just log it and continue */ |
| 1654 | logger(ifp->ctx, errno == ENOENT ? LOG_DEBUG : LOG_WARNING, |
| 1655 | "IPV6CTL_ACCEPT_RTADV: %m"); |
| 1656 | else if (ra != 0 && own) { |
| 1657 | logger(ifp->ctx, LOG_DEBUG, "disabling Kernel IPv6 RA support"); |
| 1658 | if (set_inet6_sysctl(IPV6CTL_ACCEPT_RTADV, 0) == -1) { |
| 1659 | logger(ifp->ctx, LOG_ERR, "IPV6CTL_ACCEPT_RTADV: %m"); |
| 1660 | return ra; |
| 1661 | } |
| 1662 | ra = 0; |
| 1663 | #else |
| 1664 | ra = 0; |
| 1665 | if (own) { |
| 1666 | #endif |
| 1667 | /* Flush the kernel knowledge of advertised routers |
| 1668 | * and prefixes so the kernel does not expire prefixes |
| 1669 | * and default routes we are trying to own. */ |
| 1670 | if (if_raflush(s) == -1) |
| 1671 | logger(ctx, LOG_WARNING, "if_raflush: %m"); |
| 1672 | } |
| 1673 | |
| 1674 | ctx->ra_global = ra; |
| 1675 | return ra; |
| 1676 | } |
| 1677 | |
| 1678 | int |
| 1679 | if_checkipv6(struct dhcpcd_ctx *ctx, const struct interface *ifp, int own) |
| 1680 | { |
| 1681 | int s, r; |
| 1682 | |
| 1683 | if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) == -1) |
| 1684 | return -1; |
| 1685 | r = _if_checkipv6(s, ctx, ifp, own); |
| 1686 | close(s); |
| 1687 | return r; |
| 1688 | } |
| 1689 | #endif |