1 /* SPDX-License-Identifier: BSD-2-Clause */ 2 /* 3 * BSD interface driver for dhcpcd 4 * Copyright (c) 2006-2020 Roy Marples <roy@marples.name> 5 * All rights reserved 6 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/ioctl.h> 30 #include <sys/param.h> 31 #include <sys/socket.h> 32 #include <sys/stat.h> 33 #include <sys/sysctl.h> 34 #include <sys/time.h> 35 #include <sys/types.h> 36 #include <sys/uio.h> 37 #include <sys/utsname.h> 38 39 #include "config.h" 40 41 #include <arpa/inet.h> 42 #include <net/bpf.h> 43 #include <net/if.h> 44 #include <net/if_dl.h> 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 __NetBSD__ 53 #include <net/if_vlanvar.h> /* Needs netinet/if_ether.h */ 54 #elif defined(__DragonFly__) 55 #include <net/vlan/if_vlan_var.h> 56 #else 57 #include <net/if_vlan_var.h> 58 #endif 59 #ifdef __DragonFly__ 60 # include <netproto/802_11/ieee80211_ioctl.h> 61 #else 62 # include <net80211/ieee80211.h> 63 # include <net80211/ieee80211_ioctl.h> 64 #endif 65 66 #include <assert.h> 67 #include <errno.h> 68 #include <fcntl.h> 69 #include <fnmatch.h> 70 #include <paths.h> 71 #include <stddef.h> 72 #include <stdio.h> 73 #include <stdlib.h> 74 #include <string.h> 75 #include <unistd.h> 76 77 #if defined(OpenBSD) && OpenBSD >= 201411 78 /* OpenBSD dropped the global setting from sysctl but left the #define 79 * which causes a EPERM error when trying to use it. 80 * I think both the error and keeping the define are wrong, so we #undef it. */ 81 #undef IPV6CTL_ACCEPT_RTADV 82 #endif 83 84 #include "common.h" 85 #include "dhcp.h" 86 #include "if.h" 87 #include "if-options.h" 88 #include "ipv4.h" 89 #include "ipv4ll.h" 90 #include "ipv6.h" 91 #include "ipv6nd.h" 92 #include "logerr.h" 93 #include "privsep.h" 94 #include "route.h" 95 #include "sa.h" 96 97 #ifndef RT_ROUNDUP 98 #define RT_ROUNDUP(a) \ 99 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 100 #define RT_ADVANCE(x, n) (x += RT_ROUNDUP((n)->sa_len)) 101 #endif 102 103 /* Ignore these interface names which look like ethernet but are virtual or 104 * just won't work without explicit configuration. */ 105 static const char * const ifnames_ignore[] = { 106 "bridge", 107 "fwe", /* Firewire */ 108 "fwip", /* Firewire */ 109 "tap", 110 "vether", 111 "xvif", /* XEN DOM0 -> guest interface */ 112 NULL 113 }; 114 115 struct priv { 116 int pf_inet6_fd; 117 }; 118 119 struct rtm 120 { 121 struct rt_msghdr hdr; 122 char buffer[sizeof(struct sockaddr_storage) * RTAX_MAX]; 123 }; 124 125 int 126 os_init(void) 127 { 128 return 0; 129 } 130 131 int 132 if_init(__unused struct interface *iface) 133 { 134 /* BSD promotes secondary address by default */ 135 return 0; 136 } 137 138 int 139 if_conf(__unused struct interface *iface) 140 { 141 /* No extra checks needed on BSD */ 142 return 0; 143 } 144 145 int 146 if_opensockets_os(struct dhcpcd_ctx *ctx) 147 { 148 struct priv *priv; 149 int n; 150 #if defined(RO_MSGFILTER) || defined(ROUTE_MSGFILTER) 151 unsigned char msgfilter[] = { 152 RTM_IFINFO, 153 #ifdef RTM_IFANNOUNCE 154 RTM_IFANNOUNCE, 155 #endif 156 RTM_ADD, RTM_CHANGE, RTM_DELETE, RTM_MISS, 157 #ifdef RTM_CHGADDR 158 RTM_CHGADDR, 159 #endif 160 RTM_NEWADDR, RTM_DELADDR 161 }; 162 #ifdef ROUTE_MSGFILTER 163 unsigned int i, msgfilter_mask; 164 #endif 165 #endif 166 167 if ((priv = malloc(sizeof(*priv))) == NULL) 168 return -1; 169 ctx->priv = priv; 170 171 #ifdef INET6 172 priv->pf_inet6_fd = xsocket(PF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, 0); 173 #ifdef PRIVSEP_RIGHTS 174 if (IN_PRIVSEP(ctx)) 175 ps_rights_limit_ioctl(priv->pf_inet6_fd); 176 #endif 177 /* Don't return an error so we at least work on kernels witout INET6 178 * even though we expect INET6 support. 179 * We will fail noisily elsewhere anyway. */ 180 #else 181 priv->pf_inet6_fd = -1; 182 #endif 183 184 ctx->link_fd = xsocket(PF_ROUTE, SOCK_RAW | SOCK_CXNB, AF_UNSPEC); 185 if (ctx->link_fd == -1) 186 return -1; 187 188 #ifdef SO_RERROR 189 n = 1; 190 if (setsockopt(ctx->link_fd, SOL_SOCKET, SO_RERROR, &n,sizeof(n)) == -1) 191 logerr("%s: SO_RERROR", __func__); 192 #endif 193 194 /* Ignore our own route(4) messages. 195 * Sadly there is no way of doing this for route(4) messages 196 * generated from addresses we add/delete. */ 197 n = 0; 198 if (setsockopt(ctx->link_fd, SOL_SOCKET, SO_USELOOPBACK, 199 &n, sizeof(n)) == -1) 200 logerr("%s: SO_USELOOPBACK", __func__); 201 202 #if defined(RO_MSGFILTER) 203 if (setsockopt(ctx->link_fd, PF_ROUTE, RO_MSGFILTER, 204 &msgfilter, sizeof(msgfilter)) == -1) 205 logerr(__func__); 206 #elif defined(ROUTE_MSGFILTER) 207 /* Convert the array into a bitmask. */ 208 msgfilter_mask = 0; 209 for (i = 0; i < __arraycount(msgfilter); i++) 210 msgfilter_mask |= ROUTE_FILTER(msgfilter[i]); 211 if (setsockopt(ctx->link_fd, PF_ROUTE, ROUTE_MSGFILTER, 212 &msgfilter_mask, sizeof(msgfilter_mask)) == -1) 213 logerr(__func__); 214 #else 215 #warning kernel does not support route message filtering 216 #endif 217 218 #ifdef PRIVSEP_RIGHTS 219 /* We need to getsockopt for SO_RCVBUF and 220 * setsockopt for RO_MISSFILTER. */ 221 if (IN_PRIVSEP(ctx)) 222 ps_rights_limit_fd_sockopt(ctx->link_fd); 223 #endif 224 225 return 0; 226 } 227 228 void 229 if_closesockets_os(struct dhcpcd_ctx *ctx) 230 { 231 struct priv *priv; 232 233 priv = (struct priv *)ctx->priv; 234 if (priv->pf_inet6_fd != -1) 235 close(priv->pf_inet6_fd); 236 free(priv); 237 ctx->priv = NULL; 238 } 239 240 #if defined(SIOCALIFADDR) && defined(IFLR_ACTIVE) /*NetBSD */ 241 static int 242 if_ioctllink(struct dhcpcd_ctx *ctx, unsigned long req, void *data, size_t len) 243 { 244 int s; 245 int retval; 246 247 #ifdef PRIVSEP 248 if (ctx->options & DHCPCD_PRIVSEP) 249 return (int)ps_root_ioctllink(ctx, req, data, len); 250 #else 251 UNUSED(ctx); 252 #endif 253 254 s = socket(PF_LINK, SOCK_DGRAM, 0); 255 if (s == -1) 256 return -1; 257 retval = ioctl(s, req, data, len); 258 close(s); 259 return retval; 260 } 261 #endif 262 263 int 264 if_setmac(struct interface *ifp, void *mac, uint8_t maclen) 265 { 266 267 if (ifp->hwlen != maclen) { 268 errno = EINVAL; 269 return -1; 270 } 271 272 #if defined(SIOCALIFADDR) && defined(IFLR_ACTIVE) /*NetBSD */ 273 struct if_laddrreq iflr = { .flags = IFLR_ACTIVE }; 274 struct sockaddr_dl *sdl = satosdl(&iflr.addr); 275 int retval; 276 277 strlcpy(iflr.iflr_name, ifp->name, sizeof(iflr.iflr_name)); 278 sdl->sdl_family = AF_LINK; 279 sdl->sdl_len = sizeof(*sdl); 280 sdl->sdl_alen = maclen; 281 memcpy(LLADDR(sdl), mac, maclen); 282 retval = if_ioctllink(ifp->ctx, SIOCALIFADDR, &iflr, sizeof(iflr)); 283 284 /* Try and remove the old address */ 285 memcpy(LLADDR(sdl), ifp->hwaddr, ifp->hwlen); 286 if_ioctllink(ifp->ctx, SIOCDLIFADDR, &iflr, sizeof(iflr)); 287 288 return retval; 289 #else 290 struct ifreq ifr = { 291 .ifr_addr.sa_family = AF_LINK, 292 .ifr_addr.sa_len = maclen, 293 }; 294 295 strlcpy(ifr.ifr_name, ifp->name, sizeof(ifr.ifr_name)); 296 memcpy(ifr.ifr_addr.sa_data, mac, maclen); 297 return if_ioctl(ifp->ctx, SIOCSIFLLADDR, &ifr, sizeof(ifr)); 298 #endif 299 } 300 301 static bool 302 if_ignore1(const char *drvname) 303 { 304 const char * const *p; 305 306 for (p = ifnames_ignore; *p; p++) { 307 if (strcmp(*p, drvname) == 0) 308 return true; 309 } 310 return false; 311 } 312 313 #ifdef SIOCGIFGROUP 314 int 315 if_ignoregroup(int s, const char *ifname) 316 { 317 struct ifgroupreq ifgr = { .ifgr_len = 0 }; 318 struct ifg_req *ifg; 319 size_t ifg_len; 320 321 /* Sadly it is possible to remove the device name 322 * from the interface groups, but hopefully this 323 * will be very unlikely.... */ 324 325 strlcpy(ifgr.ifgr_name, ifname, sizeof(ifgr.ifgr_name)); 326 if (ioctl(s, SIOCGIFGROUP, &ifgr) == -1 || 327 (ifgr.ifgr_groups = malloc(ifgr.ifgr_len)) == NULL || 328 ioctl(s, SIOCGIFGROUP, &ifgr) == -1) 329 { 330 logerr(__func__); 331 return -1; 332 } 333 334 for (ifg = ifgr.ifgr_groups, ifg_len = ifgr.ifgr_len; 335 ifg && ifg_len >= sizeof(*ifg); 336 ifg++, ifg_len -= sizeof(*ifg)) 337 { 338 if (if_ignore1(ifg->ifgrq_group)) 339 return 1; 340 } 341 return 0; 342 } 343 #endif 344 345 bool 346 if_ignore(struct dhcpcd_ctx *ctx, const char *ifname) 347 { 348 struct if_spec spec; 349 350 if (if_nametospec(ifname, &spec) != 0) 351 return false; 352 353 if (if_ignore1(spec.drvname)) 354 return true; 355 356 #ifdef SIOCGIFGROUP 357 #if defined(PRIVSEP) && defined(HAVE_PLEDGE) 358 if (IN_PRIVSEP(ctx)) 359 return ps_root_ifignoregroup(ctx, ifname) == 1 ? true : false; 360 #endif 361 else 362 return if_ignoregroup(ctx->pf_inet_fd, ifname) == 1 ? 363 true : false; 364 #else 365 UNUSED(ctx); 366 return false; 367 #endif 368 } 369 370 static int if_indirect_ioctl(struct dhcpcd_ctx *ctx, 371 const char *ifname, unsigned long cmd, void *data, size_t len) 372 { 373 struct ifreq ifr = { .ifr_flags = 0 }; 374 375 #if defined(PRIVSEP) && (defined(HAVE_CAPSICUM) || defined(HAVE_PLEDGE)) 376 if (IN_PRIVSEP(ctx)) 377 return (int)ps_root_indirectioctl(ctx, cmd, ifname, data, len); 378 #else 379 UNUSED(len); 380 #endif 381 382 strlcpy(ifr.ifr_name, ifname, IFNAMSIZ); 383 ifr.ifr_data = data; 384 return ioctl(ctx->pf_inet_fd, cmd, &ifr); 385 } 386 387 int 388 if_carrier(struct interface *ifp, const void *ifadata) 389 { 390 const struct if_data *ifi = ifadata; 391 392 /* 393 * Every BSD returns this and it is the sole source of truth. 394 * Not all BSD's support SIOCGIFDATA and not all interfaces 395 * support SIOCGIFMEDIA. 396 */ 397 assert(ifadata != NULL); 398 399 if (ifi->ifi_link_state >= LINK_STATE_UP) 400 return LINK_UP; 401 if (ifi->ifi_link_state == LINK_STATE_UNKNOWN) { 402 /* 403 * Work around net80211 issues in some BSDs. 404 * Wireless MUST support link state change. 405 */ 406 if (ifp->wireless) 407 return LINK_DOWN; 408 return LINK_UNKNOWN; 409 } 410 return LINK_DOWN; 411 } 412 413 bool 414 if_roaming(struct interface *ifp) 415 { 416 417 /* Check for NetBSD as a safety measure. 418 * If other BSD's gain IN_IFF_TENTATIVE check they re-do DAD 419 * when the carrier comes up again. */ 420 #if defined(IN_IFF_TENTATIVE) && defined(__NetBSD__) 421 return ifp->flags & IFF_UP && ifp->carrier == LINK_DOWN; 422 #else 423 UNUSED(ifp); 424 return false; 425 #endif 426 } 427 428 static void 429 if_linkaddr(struct sockaddr_dl *sdl, const struct interface *ifp) 430 { 431 432 memset(sdl, 0, sizeof(*sdl)); 433 sdl->sdl_family = AF_LINK; 434 sdl->sdl_len = sizeof(*sdl); 435 sdl->sdl_nlen = sdl->sdl_alen = sdl->sdl_slen = 0; 436 sdl->sdl_index = (unsigned short)ifp->index; 437 } 438 439 static int 440 if_getssid1(struct dhcpcd_ctx *ctx, const char *ifname, void *ssid) 441 { 442 int retval = -1; 443 #if defined(SIOCG80211NWID) 444 struct ieee80211_nwid nwid; 445 #elif defined(IEEE80211_IOC_SSID) 446 struct ieee80211req ireq; 447 char nwid[IEEE80211_NWID_LEN]; 448 #endif 449 450 #if defined(SIOCG80211NWID) /* NetBSD */ 451 memset(&nwid, 0, sizeof(nwid)); 452 if (if_indirect_ioctl(ctx, ifname, SIOCG80211NWID, 453 &nwid, sizeof(nwid)) == 0) 454 { 455 if (ssid == NULL) 456 retval = nwid.i_len; 457 else if (nwid.i_len > IF_SSIDLEN) 458 errno = ENOBUFS; 459 else { 460 retval = nwid.i_len; 461 memcpy(ssid, nwid.i_nwid, nwid.i_len); 462 } 463 } 464 #elif defined(IEEE80211_IOC_SSID) /* FreeBSD */ 465 memset(&ireq, 0, sizeof(ireq)); 466 strlcpy(ireq.i_name, ifname, sizeof(ireq.i_name)); 467 ireq.i_type = IEEE80211_IOC_SSID; 468 ireq.i_val = -1; 469 memset(nwid, 0, sizeof(nwid)); 470 ireq.i_data = &nwid; 471 if (ioctl(ctx->pf_inet_fd, SIOCG80211, &ireq) == 0) { 472 if (ssid == NULL) 473 retval = ireq.i_len; 474 else if (ireq.i_len > IF_SSIDLEN) 475 errno = ENOBUFS; 476 else { 477 retval = ireq.i_len; 478 memcpy(ssid, nwid, ireq.i_len); 479 } 480 } 481 #else 482 errno = ENOSYS; 483 #endif 484 485 return retval; 486 } 487 488 int 489 if_getssid(struct interface *ifp) 490 { 491 int r; 492 493 r = if_getssid1(ifp->ctx, ifp->name, ifp->ssid); 494 if (r != -1) 495 ifp->ssid_len = (unsigned int)r; 496 else 497 ifp->ssid_len = 0; 498 ifp->ssid[ifp->ssid_len] = '\0'; 499 return r; 500 } 501 502 /* 503 * FreeBSD allows for Virtual Access Points 504 * We need to check if the interface is a Virtual Interface Master 505 * and if so, don't use it. 506 * This check is made by virtue of being a IEEE80211 device but 507 * returning the SSID gives an error. 508 */ 509 int 510 if_vimaster(struct dhcpcd_ctx *ctx, const char *ifname) 511 { 512 int r; 513 struct ifmediareq ifmr = { .ifm_active = 0 }; 514 515 strlcpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name)); 516 r = ioctl(ctx->pf_inet_fd, SIOCGIFMEDIA, &ifmr); 517 if (r == -1) 518 return -1; 519 if (ifmr.ifm_status & IFM_AVALID && 520 IFM_TYPE(ifmr.ifm_active) == IFM_IEEE80211) 521 { 522 if (if_getssid1(ctx, ifname, NULL) == -1) 523 return 1; 524 } 525 return 0; 526 } 527 528 unsigned short 529 if_vlanid(const struct interface *ifp) 530 { 531 #ifdef SIOCGETVLAN 532 struct vlanreq vlr = { .vlr_tag = 0 }; 533 534 if (if_indirect_ioctl(ifp->ctx, ifp->name, SIOCGETVLAN, 535 &vlr, sizeof(vlr)) != 0) 536 return 0; /* 0 means no VLANID */ 537 return vlr.vlr_tag; 538 #elif defined(SIOCGVNETID) 539 struct ifreq ifr = { .ifr_vnetid = 0 }; 540 541 strlcpy(ifr.ifr_name, ifp->name, sizeof(ifr.ifr_name)); 542 if (ioctl(ifp->ctx->pf_inet_fd, SIOCGVNETID, &ifr) != 0) 543 return 0; /* 0 means no VLANID */ 544 return ifr.ifr_vnetid; 545 #else 546 UNUSED(ifp); 547 return 0; /* 0 means no VLANID */ 548 #endif 549 } 550 551 static int 552 get_addrs(int type, const void *data, size_t data_len, 553 const struct sockaddr **sa) 554 { 555 const char *cp, *ep; 556 int i; 557 558 cp = data; 559 ep = cp + data_len; 560 for (i = 0; i < RTAX_MAX; i++) { 561 if (type & (1 << i)) { 562 if (cp >= ep) { 563 errno = EINVAL; 564 return -1; 565 } 566 sa[i] = (const struct sockaddr *)cp; 567 RT_ADVANCE(cp, sa[i]); 568 } else 569 sa[i] = NULL; 570 } 571 572 return 0; 573 } 574 575 static struct interface * 576 if_findsdl(struct dhcpcd_ctx *ctx, const struct sockaddr_dl *sdl) 577 { 578 579 if (sdl->sdl_index) 580 return if_findindex(ctx->ifaces, sdl->sdl_index); 581 582 if (sdl->sdl_nlen) { 583 char ifname[IF_NAMESIZE]; 584 585 memcpy(ifname, sdl->sdl_data, sdl->sdl_nlen); 586 ifname[sdl->sdl_nlen] = '\0'; 587 return if_find(ctx->ifaces, ifname); 588 } 589 if (sdl->sdl_alen) { 590 struct interface *ifp; 591 592 TAILQ_FOREACH(ifp, ctx->ifaces, next) { 593 if (ifp->hwlen == sdl->sdl_alen && 594 memcmp(ifp->hwaddr, 595 sdl->sdl_data, sdl->sdl_alen) == 0) 596 return ifp; 597 } 598 } 599 600 errno = ENOENT; 601 return NULL; 602 } 603 604 static struct interface * 605 if_findsa(struct dhcpcd_ctx *ctx, const struct sockaddr *sa) 606 { 607 if (sa == NULL) { 608 errno = EINVAL; 609 return NULL; 610 } 611 612 switch (sa->sa_family) { 613 case AF_LINK: 614 { 615 const struct sockaddr_dl *sdl; 616 617 sdl = (const void *)sa; 618 return if_findsdl(ctx, sdl); 619 } 620 #ifdef INET 621 case AF_INET: 622 { 623 const struct sockaddr_in *sin; 624 struct ipv4_addr *ia; 625 626 sin = (const void *)sa; 627 if ((ia = ipv4_findmaskaddr(ctx, &sin->sin_addr))) 628 return ia->iface; 629 break; 630 } 631 #endif 632 #ifdef INET6 633 case AF_INET6: 634 { 635 const struct sockaddr_in6 *sin; 636 unsigned int scope; 637 struct ipv6_addr *ia; 638 639 sin = (const void *)sa; 640 scope = ipv6_getscope(sin); 641 if (scope != 0) 642 return if_findindex(ctx->ifaces, scope); 643 if ((ia = ipv6_findmaskaddr(ctx, &sin->sin6_addr))) 644 return ia->iface; 645 break; 646 } 647 #endif 648 default: 649 errno = EAFNOSUPPORT; 650 return NULL; 651 } 652 653 errno = ENOENT; 654 return NULL; 655 } 656 657 static void 658 if_copysa(struct sockaddr *dst, const struct sockaddr *src) 659 { 660 661 assert(dst != NULL); 662 assert(src != NULL); 663 664 memcpy(dst, src, src->sa_len); 665 #if defined(INET6) && defined(__KAME__) 666 if (dst->sa_family == AF_INET6) { 667 struct in6_addr *in6; 668 669 in6 = &satosin6(dst)->sin6_addr; 670 if (IN6_IS_ADDR_LINKLOCAL(in6)) 671 in6->s6_addr[2] = in6->s6_addr[3] = '\0'; 672 } 673 #endif 674 } 675 676 int 677 if_route(unsigned char cmd, const struct rt *rt) 678 { 679 struct dhcpcd_ctx *ctx; 680 struct rtm rtmsg; 681 struct rt_msghdr *rtm = &rtmsg.hdr; 682 char *bp = rtmsg.buffer; 683 struct sockaddr_dl sdl; 684 bool gateway_unspec; 685 686 assert(rt != NULL); 687 assert(rt->rt_ifp != NULL); 688 assert(rt->rt_ifp->ctx != NULL); 689 ctx = rt->rt_ifp->ctx; 690 691 #define ADDSA(sa) do { \ 692 memcpy(bp, (sa), (sa)->sa_len); \ 693 bp += RT_ROUNDUP((sa)->sa_len); \ 694 } while (0 /* CONSTCOND */) 695 696 memset(&rtmsg, 0, sizeof(rtmsg)); 697 rtm->rtm_version = RTM_VERSION; 698 rtm->rtm_type = cmd; 699 #ifdef __OpenBSD__ 700 rtm->rtm_pid = getpid(); 701 #endif 702 rtm->rtm_seq = ++ctx->seq; 703 rtm->rtm_flags = (int)rt->rt_flags; 704 rtm->rtm_addrs = RTA_DST; 705 #ifdef RTF_PINNED 706 if (cmd != RTM_ADD) 707 rtm->rtm_flags |= RTF_PINNED; 708 #endif 709 710 gateway_unspec = sa_is_unspecified(&rt->rt_gateway); 711 712 if (cmd == RTM_ADD || cmd == RTM_CHANGE) { 713 bool netmask_bcast = sa_is_allones(&rt->rt_netmask); 714 715 rtm->rtm_flags |= RTF_UP; 716 rtm->rtm_addrs |= RTA_GATEWAY; 717 if (!(rtm->rtm_flags & RTF_REJECT) && 718 !sa_is_loopback(&rt->rt_gateway)) 719 { 720 rtm->rtm_index = (unsigned short)rt->rt_ifp->index; 721 /* 722 * OpenBSD rejects the message for on-link routes. 723 * FreeBSD-12 kernel apparently panics. 724 * I can't replicate the panic, but better safe than sorry! 725 * https://roy.marples.name/archives/dhcpcd-discuss/0002286.html 726 * 727 * Neither OS currently allows IPv6 address sharing anyway, so let's 728 * try to encourage someone to fix that by logging a waring during compile. 729 */ 730 #if defined(__FreeBSD__) || defined(__OpenBSD__) 731 #warning kernel does not allow IPv6 address sharing 732 if (!gateway_unspec || rt->rt_dest.sa_family!=AF_INET6) 733 #endif 734 rtm->rtm_addrs |= RTA_IFP; 735 if (!sa_is_unspecified(&rt->rt_ifa)) 736 rtm->rtm_addrs |= RTA_IFA; 737 } 738 if (netmask_bcast) 739 rtm->rtm_flags |= RTF_HOST; 740 /* Network routes are cloning or connected if supported. 741 * All other routes are static. */ 742 if (gateway_unspec) { 743 #ifdef RTF_CLONING 744 rtm->rtm_flags |= RTF_CLONING; 745 #endif 746 #ifdef RTF_CONNECTED 747 rtm->rtm_flags |= RTF_CONNECTED; 748 #endif 749 #ifdef RTP_CONNECTED 750 rtm->rtm_priority = RTP_CONNECTED; 751 #endif 752 #ifdef RTF_CLONING 753 if (netmask_bcast) { 754 /* 755 * We add a cloning network route for a single 756 * host. Traffic to the host will generate a 757 * cloned route and the hardware address will 758 * resolve correctly. 759 * It might be more correct to use RTF_HOST 760 * instead of RTF_CLONING, and that does work, 761 * but some OS generate an arp warning 762 * diagnostic which we don't want to do. 763 */ 764 rtm->rtm_flags &= ~RTF_HOST; 765 } 766 #endif 767 } else 768 rtm->rtm_flags |= RTF_GATEWAY; 769 770 if (rt->rt_dflags & RTDF_STATIC) 771 rtm->rtm_flags |= RTF_STATIC; 772 773 if (rt->rt_mtu != 0) { 774 rtm->rtm_inits |= RTV_MTU; 775 rtm->rtm_rmx.rmx_mtu = rt->rt_mtu; 776 } 777 } 778 779 if (!(rtm->rtm_flags & RTF_HOST)) 780 rtm->rtm_addrs |= RTA_NETMASK; 781 782 if_linkaddr(&sdl, rt->rt_ifp); 783 784 ADDSA(&rt->rt_dest); 785 786 if (rtm->rtm_addrs & RTA_GATEWAY) { 787 if (gateway_unspec) 788 ADDSA((struct sockaddr *)&sdl); 789 else { 790 union sa_ss gateway; 791 792 if_copysa(&gateway.sa, &rt->rt_gateway); 793 #ifdef INET6 794 if (gateway.sa.sa_family == AF_INET6) 795 ipv6_setscope(&gateway.sin6, rt->rt_ifp->index); 796 #endif 797 ADDSA(&gateway.sa); 798 } 799 } 800 801 if (rtm->rtm_addrs & RTA_NETMASK) 802 ADDSA(&rt->rt_netmask); 803 804 if (rtm->rtm_addrs & RTA_IFP) 805 ADDSA((struct sockaddr *)&sdl); 806 807 if (rtm->rtm_addrs & RTA_IFA) 808 ADDSA(&rt->rt_ifa); 809 810 #undef ADDSA 811 812 rtm->rtm_msglen = (unsigned short)(bp - (char *)rtm); 813 814 #ifdef PRIVSEP 815 if (ctx->options & DHCPCD_PRIVSEP) { 816 if (ps_root_route(ctx, rtm, rtm->rtm_msglen) == -1) 817 return -1; 818 return 0; 819 } 820 #endif 821 if (write(ctx->link_fd, rtm, rtm->rtm_msglen) == -1) 822 return -1; 823 return 0; 824 } 825 826 static bool 827 if_realroute(const struct rt_msghdr *rtm) 828 { 829 830 #ifdef RTF_CLONED 831 if (rtm->rtm_flags & RTF_CLONED) 832 return false; 833 #endif 834 #ifdef RTF_WASCLONED 835 if (rtm->rtm_flags & RTF_WASCLONED) 836 return false; 837 #endif 838 #ifdef RTF_LOCAL 839 if (rtm->rtm_flags & RTF_LOCAL) 840 return false; 841 #endif 842 #ifdef RTF_BROADCAST 843 if (rtm->rtm_flags & RTF_BROADCAST) 844 return false; 845 #endif 846 return true; 847 } 848 849 static int 850 if_copyrt(struct dhcpcd_ctx *ctx, struct rt *rt, const struct rt_msghdr *rtm) 851 { 852 const struct sockaddr *rti_info[RTAX_MAX]; 853 854 if (!(rtm->rtm_addrs & RTA_DST)) { 855 errno = EINVAL; 856 return -1; 857 } 858 if (rtm->rtm_type != RTM_MISS && !(rtm->rtm_addrs & RTA_GATEWAY)) { 859 errno = EINVAL; 860 return -1; 861 } 862 863 if (get_addrs(rtm->rtm_addrs, (const char *)rtm + sizeof(*rtm), 864 rtm->rtm_msglen - sizeof(*rtm), rti_info) == -1) 865 return -1; 866 memset(rt, 0, sizeof(*rt)); 867 868 rt->rt_flags = (unsigned int)rtm->rtm_flags; 869 if_copysa(&rt->rt_dest, rti_info[RTAX_DST]); 870 if (rtm->rtm_addrs & RTA_NETMASK) { 871 if_copysa(&rt->rt_netmask, rti_info[RTAX_NETMASK]); 872 if (rt->rt_netmask.sa_family == 255) /* Why? */ 873 rt->rt_netmask.sa_family = rt->rt_dest.sa_family; 874 } 875 876 /* dhcpcd likes an unspecified gateway to indicate via the link. 877 * However we need to know if gateway was a link with an address. */ 878 if (rtm->rtm_addrs & RTA_GATEWAY) { 879 if (rti_info[RTAX_GATEWAY]->sa_family == AF_LINK) { 880 const struct sockaddr_dl *sdl; 881 882 sdl = (const struct sockaddr_dl*) 883 (const void *)rti_info[RTAX_GATEWAY]; 884 if (sdl->sdl_alen != 0) 885 rt->rt_dflags |= RTDF_GATELINK; 886 } else if (rtm->rtm_flags & RTF_GATEWAY) 887 if_copysa(&rt->rt_gateway, rti_info[RTAX_GATEWAY]); 888 } 889 890 if (rtm->rtm_addrs & RTA_IFA) 891 if_copysa(&rt->rt_ifa, rti_info[RTAX_IFA]); 892 893 rt->rt_mtu = (unsigned int)rtm->rtm_rmx.rmx_mtu; 894 895 if (rtm->rtm_index) 896 rt->rt_ifp = if_findindex(ctx->ifaces, rtm->rtm_index); 897 else if (rtm->rtm_addrs & RTA_IFP) 898 rt->rt_ifp = if_findsa(ctx, rti_info[RTAX_IFP]); 899 else if (rtm->rtm_addrs & RTA_GATEWAY) 900 rt->rt_ifp = if_findsa(ctx, rti_info[RTAX_GATEWAY]); 901 else 902 rt->rt_ifp = if_findsa(ctx, rti_info[RTAX_DST]); 903 904 if (rt->rt_ifp == NULL && rtm->rtm_type == RTM_MISS) 905 rt->rt_ifp = if_find(ctx->ifaces, "lo0"); 906 907 if (rt->rt_ifp == NULL) { 908 errno = ESRCH; 909 return -1; 910 } 911 return 0; 912 } 913 914 int 915 if_initrt(struct dhcpcd_ctx *ctx, rb_tree_t *kroutes, int af) 916 { 917 struct rt_msghdr *rtm; 918 int mib[6]; 919 size_t needed; 920 char *buf, *p, *end; 921 struct rt rt, *rtn; 922 923 mib[0] = CTL_NET; 924 mib[1] = PF_ROUTE; 925 mib[2] = 0; 926 mib[3] = af; 927 mib[4] = NET_RT_DUMP; 928 mib[5] = 0; 929 930 if (sysctl(mib, 6, NULL, &needed, NULL, 0) == -1) 931 return -1; 932 if (needed == 0) 933 return 0; 934 if ((buf = malloc(needed)) == NULL) 935 return -1; 936 if (sysctl(mib, 6, buf, &needed, NULL, 0) == -1) { 937 free(buf); 938 return -1; 939 } 940 941 end = buf + needed; 942 for (p = buf; p < end; p += rtm->rtm_msglen) { 943 rtm = (void *)p; 944 if (p + rtm->rtm_msglen >= end) { 945 errno = EINVAL; 946 break; 947 } 948 if (!if_realroute(rtm)) 949 continue; 950 if (if_copyrt(ctx, &rt, rtm) != 0) 951 continue; 952 if ((rtn = rt_new(rt.rt_ifp)) == NULL) { 953 logerr(__func__); 954 break; 955 } 956 memcpy(rtn, &rt, sizeof(*rtn)); 957 if (rb_tree_insert_node(kroutes, rtn) != rtn) 958 rt_free(rtn); 959 } 960 free(buf); 961 return p == end ? 0 : -1; 962 } 963 964 #ifdef INET 965 int 966 if_address(unsigned char cmd, const struct ipv4_addr *ia) 967 { 968 int r; 969 struct in_aliasreq ifra; 970 struct dhcpcd_ctx *ctx = ia->iface->ctx; 971 972 memset(&ifra, 0, sizeof(ifra)); 973 strlcpy(ifra.ifra_name, ia->iface->name, sizeof(ifra.ifra_name)); 974 975 #define ADDADDR(var, addr) do { \ 976 (var)->sin_family = AF_INET; \ 977 (var)->sin_len = sizeof(*(var)); \ 978 (var)->sin_addr = *(addr); \ 979 } while (/*CONSTCOND*/0) 980 ADDADDR(&ifra.ifra_addr, &ia->addr); 981 ADDADDR(&ifra.ifra_mask, &ia->mask); 982 if (cmd == RTM_NEWADDR && ia->brd.s_addr != INADDR_ANY) 983 ADDADDR(&ifra.ifra_broadaddr, &ia->brd); 984 #undef ADDADDR 985 986 r = if_ioctl(ctx, 987 cmd == RTM_DELADDR ? SIOCDIFADDR : SIOCAIFADDR, &ifra,sizeof(ifra)); 988 return r; 989 } 990 991 #if !(defined(HAVE_IFADDRS_ADDRFLAGS) && defined(HAVE_IFAM_ADDRFLAGS)) 992 int 993 if_addrflags(const struct interface *ifp, const struct in_addr *addr, 994 __unused const char *alias) 995 { 996 #ifdef SIOCGIFAFLAG_IN 997 struct ifreq ifr; 998 struct sockaddr_in *sin; 999 1000 memset(&ifr, 0, sizeof(ifr)); 1001 strlcpy(ifr.ifr_name, ifp->name, sizeof(ifr.ifr_name)); 1002 sin = (void *)&ifr.ifr_addr; 1003 sin->sin_family = AF_INET; 1004 sin->sin_addr = *addr; 1005 if (ioctl(ifp->ctx->pf_inet_fd, SIOCGIFAFLAG_IN, &ifr) == -1) 1006 return -1; 1007 return ifr.ifr_addrflags; 1008 #else 1009 UNUSED(ifp); 1010 UNUSED(addr); 1011 return 0; 1012 #endif 1013 } 1014 #endif 1015 #endif /* INET */ 1016 1017 #ifdef INET6 1018 static int 1019 if_ioctl6(struct dhcpcd_ctx *ctx, unsigned long req, void *data, size_t len) 1020 { 1021 struct priv *priv; 1022 1023 #ifdef PRIVSEP 1024 if (ctx->options & DHCPCD_PRIVSEP) 1025 return (int)ps_root_ioctl6(ctx, req, data, len); 1026 #endif 1027 1028 priv = ctx->priv; 1029 return ioctl(priv->pf_inet6_fd, req, data, len); 1030 } 1031 1032 int 1033 if_address6(unsigned char cmd, const struct ipv6_addr *ia) 1034 { 1035 struct in6_aliasreq ifa = { .ifra_flags = 0 }; 1036 struct in6_addr mask; 1037 struct dhcpcd_ctx *ctx = ia->iface->ctx; 1038 1039 strlcpy(ifa.ifra_name, ia->iface->name, sizeof(ifa.ifra_name)); 1040 #if defined(__FreeBSD__) || defined(__DragonFly__) 1041 /* This is a bug - the kernel should work this out. */ 1042 if (ia->addr_flags & IN6_IFF_TENTATIVE) 1043 ifa.ifra_flags |= IN6_IFF_TENTATIVE; 1044 #endif 1045 #if (defined(__NetBSD__) || defined(__OpenBSD__)) && \ 1046 (defined(IPV6CTL_ACCEPT_RTADV) || defined(ND6_IFF_ACCEPT_RTADV)) 1047 /* These kernels don't accept userland setting IN6_IFF_AUTOCONF */ 1048 #else 1049 if (ia->flags & IPV6_AF_AUTOCONF) 1050 ifa.ifra_flags |= IN6_IFF_AUTOCONF; 1051 #endif 1052 #ifdef IPV6_MANAGETEMPADDR 1053 if (ia->flags & IPV6_AF_TEMPORARY) 1054 ifa.ifra_flags |= IN6_IFF_TEMPORARY; 1055 #endif 1056 1057 #define ADDADDR(v, addr) { \ 1058 (v)->sin6_family = AF_INET6; \ 1059 (v)->sin6_len = sizeof(*v); \ 1060 (v)->sin6_addr = *(addr); \ 1061 } 1062 1063 ADDADDR(&ifa.ifra_addr, &ia->addr); 1064 ipv6_setscope(&ifa.ifra_addr, ia->iface->index); 1065 ipv6_mask(&mask, ia->prefix_len); 1066 ADDADDR(&ifa.ifra_prefixmask, &mask); 1067 1068 #undef ADDADDR 1069 1070 /* 1071 * Every BSD kernel wants to add the prefix of the address to it's 1072 * list of RA received prefixes. 1073 * THIS IS WRONG because there (as the comments in the kernel state) 1074 * is no API for managing prefix lifetime and the kernel should not 1075 * pretend it's from a RA either. 1076 * 1077 * The issue is that the very first assigned prefix will inherit the 1078 * lifetime of the address, but any subsequent alteration of the 1079 * address OR it's lifetime will not affect the prefix lifetime. 1080 * As such, we cannot stop the prefix from timing out and then 1081 * constantly removing the prefix route dhcpcd is capable of adding 1082 * in it's absense. 1083 * 1084 * What we can do to mitigate the issue is to add the address with 1085 * infinite lifetimes, so the prefix route will never time out. 1086 * Once done, we can then set lifetimes on the address and all is good. 1087 * The downside of this approach is that we need to manually remove 1088 * the kernel route because it has no lifetime, but this is OK as 1089 * dhcpcd will handle this too. 1090 * 1091 * This issue is discussed on the NetBSD mailing lists here: 1092 * http://mail-index.netbsd.org/tech-net/2016/08/05/msg006044.html 1093 * 1094 * Fixed in NetBSD-7.99.36 1095 * NOT fixed in FreeBSD - bug 195197 1096 * Fixed in OpenBSD-5.9 1097 */ 1098 1099 #if !((defined(__NetBSD_Version__) && __NetBSD_Version__ >= 799003600) || \ 1100 (defined(__OpenBSD__) && OpenBSD >= 201605)) 1101 if (cmd == RTM_NEWADDR && !(ia->flags & IPV6_AF_ADDED)) { 1102 ifa.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 1103 ifa.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 1104 (void)if_ioctl6(ctx, SIOCAIFADDR_IN6, &ifa, sizeof(ifa)); 1105 } 1106 #endif 1107 1108 #if defined(__OpenBSD__) && OpenBSD <= 201705 1109 /* BUT OpenBSD older than 6.2 does not reset the address lifetime 1110 * for subsequent calls... 1111 * Luckily dhcpcd will remove the lease when it expires so 1112 * just set an infinite lifetime, unless a temporary address. */ 1113 if (ifa.ifra_flags & IN6_IFF_PRIVACY) { 1114 ifa.ifra_lifetime.ia6t_vltime = ia->prefix_vltime; 1115 ifa.ifra_lifetime.ia6t_pltime = ia->prefix_pltime; 1116 } else { 1117 ifa.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 1118 ifa.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 1119 } 1120 #else 1121 ifa.ifra_lifetime.ia6t_vltime = ia->prefix_vltime; 1122 ifa.ifra_lifetime.ia6t_pltime = ia->prefix_pltime; 1123 #endif 1124 1125 return if_ioctl6(ctx, 1126 cmd == RTM_DELADDR ? SIOCDIFADDR_IN6 : SIOCAIFADDR_IN6, 1127 &ifa, sizeof(ifa)); 1128 } 1129 1130 int 1131 if_addrflags6(const struct interface *ifp, const struct in6_addr *addr, 1132 __unused const char *alias) 1133 { 1134 int flags; 1135 struct in6_ifreq ifr6; 1136 struct priv *priv; 1137 1138 memset(&ifr6, 0, sizeof(ifr6)); 1139 strlcpy(ifr6.ifr_name, ifp->name, sizeof(ifr6.ifr_name)); 1140 ifr6.ifr_addr.sin6_family = AF_INET6; 1141 ifr6.ifr_addr.sin6_addr = *addr; 1142 ipv6_setscope(&ifr6.ifr_addr, ifp->index); 1143 priv = (struct priv *)ifp->ctx->priv; 1144 if (ioctl(priv->pf_inet6_fd, SIOCGIFAFLAG_IN6, &ifr6) != -1) 1145 flags = ifr6.ifr_ifru.ifru_flags6; 1146 else 1147 flags = -1; 1148 return flags; 1149 } 1150 1151 int 1152 if_getlifetime6(struct ipv6_addr *ia) 1153 { 1154 struct in6_ifreq ifr6; 1155 time_t t; 1156 struct in6_addrlifetime *lifetime; 1157 struct priv *priv; 1158 1159 memset(&ifr6, 0, sizeof(ifr6)); 1160 strlcpy(ifr6.ifr_name, ia->iface->name, sizeof(ifr6.ifr_name)); 1161 ifr6.ifr_addr.sin6_family = AF_INET6; 1162 ifr6.ifr_addr.sin6_addr = ia->addr; 1163 ipv6_setscope(&ifr6.ifr_addr, ia->iface->index); 1164 priv = (struct priv *)ia->iface->ctx->priv; 1165 if (ioctl(priv->pf_inet6_fd, SIOCGIFALIFETIME_IN6, &ifr6) == -1) 1166 return -1; 1167 clock_gettime(CLOCK_MONOTONIC, &ia->created); 1168 1169 #if defined(__FreeBSD__) || defined(__DragonFly__) 1170 t = ia->created.tv_sec; 1171 #else 1172 t = time(NULL); 1173 #endif 1174 1175 lifetime = &ifr6.ifr_ifru.ifru_lifetime; 1176 if (lifetime->ia6t_preferred) 1177 ia->prefix_pltime = (uint32_t)(lifetime->ia6t_preferred - 1178 MIN(t, lifetime->ia6t_preferred)); 1179 else 1180 ia->prefix_pltime = ND6_INFINITE_LIFETIME; 1181 if (lifetime->ia6t_expire) { 1182 ia->prefix_vltime = (uint32_t)(lifetime->ia6t_expire - 1183 MIN(t, lifetime->ia6t_expire)); 1184 /* Calculate the created time */ 1185 ia->created.tv_sec -= lifetime->ia6t_vltime - ia->prefix_vltime; 1186 } else 1187 ia->prefix_vltime = ND6_INFINITE_LIFETIME; 1188 return 0; 1189 } 1190 #endif 1191 1192 static int 1193 if_announce(struct dhcpcd_ctx *ctx, const struct if_announcemsghdr *ifan) 1194 { 1195 1196 if (ifan->ifan_msglen < sizeof(*ifan)) { 1197 errno = EINVAL; 1198 return -1; 1199 } 1200 1201 switch(ifan->ifan_what) { 1202 case IFAN_ARRIVAL: 1203 return dhcpcd_handleinterface(ctx, 1, ifan->ifan_name); 1204 case IFAN_DEPARTURE: 1205 return dhcpcd_handleinterface(ctx, -1, ifan->ifan_name); 1206 } 1207 1208 return 0; 1209 } 1210 1211 static int 1212 if_ifinfo(struct dhcpcd_ctx *ctx, const struct if_msghdr *ifm) 1213 { 1214 struct interface *ifp; 1215 int link_state; 1216 1217 if (ifm->ifm_msglen < sizeof(*ifm)) { 1218 errno = EINVAL; 1219 return -1; 1220 } 1221 1222 if ((ifp = if_findindex(ctx->ifaces, ifm->ifm_index)) == NULL) 1223 return 0; 1224 1225 link_state = if_carrier(ifp, &ifm->ifm_data); 1226 dhcpcd_handlecarrier(ifp, link_state, (unsigned int)ifm->ifm_flags); 1227 return 0; 1228 } 1229 1230 static int 1231 if_rtm(struct dhcpcd_ctx *ctx, const struct rt_msghdr *rtm) 1232 { 1233 struct rt rt; 1234 1235 if (rtm->rtm_msglen < sizeof(*rtm)) { 1236 errno = EINVAL; 1237 return -1; 1238 } 1239 1240 /* Ignore errors. */ 1241 if (rtm->rtm_errno != 0) 1242 return 0; 1243 1244 /* Ignore messages from ourself. */ 1245 #ifdef PRIVSEP 1246 if (ctx->ps_root_pid != 0) { 1247 if (rtm->rtm_pid == ctx->ps_root_pid) 1248 return 0; 1249 } 1250 #endif 1251 1252 if (if_copyrt(ctx, &rt, rtm) == -1) 1253 return errno == ENOTSUP ? 0 : -1; 1254 1255 #ifdef INET6 1256 /* 1257 * BSD announces host routes. 1258 * As such, we should be notified of reachability by its 1259 * existance with a hardware address. 1260 * Ensure we don't call this for a newly incomplete state. 1261 */ 1262 if (rt.rt_dest.sa_family == AF_INET6 && 1263 (rt.rt_flags & RTF_HOST || rtm->rtm_type == RTM_MISS) && 1264 !(rtm->rtm_type == RTM_ADD && !(rt.rt_dflags & RTDF_GATELINK))) 1265 { 1266 bool reachable; 1267 1268 reachable = (rtm->rtm_type == RTM_ADD || 1269 rtm->rtm_type == RTM_CHANGE) && 1270 rt.rt_dflags & RTDF_GATELINK; 1271 ipv6nd_neighbour(ctx, &rt.rt_ss_dest.sin6.sin6_addr, reachable); 1272 } 1273 #endif 1274 1275 if (rtm->rtm_type != RTM_MISS && if_realroute(rtm)) 1276 rt_recvrt(rtm->rtm_type, &rt, rtm->rtm_pid); 1277 return 0; 1278 } 1279 1280 static int 1281 if_ifa(struct dhcpcd_ctx *ctx, const struct ifa_msghdr *ifam) 1282 { 1283 struct interface *ifp; 1284 const struct sockaddr *rti_info[RTAX_MAX]; 1285 int flags; 1286 pid_t pid; 1287 1288 if (ifam->ifam_msglen < sizeof(*ifam)) { 1289 errno = EINVAL; 1290 return -1; 1291 } 1292 1293 #ifdef HAVE_IFAM_PID 1294 /* Ignore address deletions from ourself. 1295 * We need to process address flag changes though. */ 1296 if (ifam->ifam_type == RTM_DELADDR) { 1297 #ifdef PRIVSEP 1298 if (ctx->ps_root_pid != 0) { 1299 if (ifam->ifam_pid == ctx->ps_root_pid) 1300 return 0; 1301 } else 1302 #endif 1303 /* address management is done via ioctl, 1304 * so SO_USELOOPBACK has no effect, 1305 * so we do need to check the pid. */ 1306 if (ifam->ifam_pid == getpid()) 1307 return 0; 1308 } 1309 pid = ifam->ifam_pid; 1310 #else 1311 pid = 0; 1312 #endif 1313 1314 if (~ifam->ifam_addrs & RTA_IFA) 1315 return 0; 1316 if ((ifp = if_findindex(ctx->ifaces, ifam->ifam_index)) == NULL) 1317 return 0; 1318 1319 if (get_addrs(ifam->ifam_addrs, (const char *)ifam + sizeof(*ifam), 1320 ifam->ifam_msglen - sizeof(*ifam), rti_info) == -1) 1321 return -1; 1322 1323 switch (rti_info[RTAX_IFA]->sa_family) { 1324 case AF_LINK: 1325 { 1326 struct sockaddr_dl sdl; 1327 1328 #ifdef RTM_CHGADDR 1329 if (ifam->ifam_type != RTM_CHGADDR) 1330 break; 1331 #else 1332 if (ifam->ifam_type != RTM_NEWADDR) 1333 break; 1334 #endif 1335 memcpy(&sdl, rti_info[RTAX_IFA], rti_info[RTAX_IFA]->sa_len); 1336 dhcpcd_handlehwaddr(ifp, ifp->hwtype, 1337 CLLADDR(&sdl), sdl.sdl_alen); 1338 break; 1339 } 1340 #ifdef INET 1341 case AF_INET: 1342 case 255: /* FIXME: Why 255? */ 1343 { 1344 const struct sockaddr_in *sin; 1345 struct in_addr addr, mask, bcast; 1346 1347 sin = (const void *)rti_info[RTAX_IFA]; 1348 addr.s_addr = sin != NULL && sin->sin_family == AF_INET ? 1349 sin->sin_addr.s_addr : INADDR_ANY; 1350 sin = (const void *)rti_info[RTAX_NETMASK]; 1351 mask.s_addr = sin != NULL && sin->sin_family == AF_INET ? 1352 sin->sin_addr.s_addr : INADDR_ANY; 1353 sin = (const void *)rti_info[RTAX_BRD]; 1354 bcast.s_addr = sin != NULL && sin->sin_family == AF_INET ? 1355 sin->sin_addr.s_addr : INADDR_ANY; 1356 1357 /* 1358 * NetBSD-7 and older send an invalid broadcast address. 1359 * So we need to query the actual address to get 1360 * the right one. 1361 * We can also use this to test if the address 1362 * has really been added or deleted. 1363 */ 1364 #ifdef SIOCGIFALIAS 1365 struct in_aliasreq ifra; 1366 1367 memset(&ifra, 0, sizeof(ifra)); 1368 strlcpy(ifra.ifra_name, ifp->name, sizeof(ifra.ifra_name)); 1369 ifra.ifra_addr.sin_family = AF_INET; 1370 ifra.ifra_addr.sin_len = sizeof(ifra.ifra_addr); 1371 ifra.ifra_addr.sin_addr = addr; 1372 if (ioctl(ctx->pf_inet_fd, SIOCGIFALIAS, &ifra) == -1) { 1373 if (errno != ENXIO && errno != EADDRNOTAVAIL) 1374 logerr("%s: SIOCGIFALIAS", __func__); 1375 if (ifam->ifam_type != RTM_DELADDR) 1376 break; 1377 } else { 1378 if (ifam->ifam_type == RTM_DELADDR) 1379 break; 1380 #if defined(__NetBSD_Version__) && __NetBSD_Version__ < 800000000 1381 bcast = ifra.ifra_broadaddr.sin_addr; 1382 #endif 1383 } 1384 #else 1385 #warning No SIOCGIFALIAS support 1386 /* 1387 * No SIOCGIFALIAS? That sucks! 1388 * This makes this call very heavy weight, but we 1389 * really need to know if the message is late or not. 1390 */ 1391 const struct sockaddr *sa; 1392 struct ifaddrs *ifaddrs = NULL, *ifa; 1393 1394 sa = rti_info[RTAX_IFA]; 1395 #ifdef PRIVSEP_GETIFADDRS 1396 if (IN_PRIVSEP(ctx)) { 1397 if (ps_root_getifaddrs(ctx, &ifaddrs) == -1) { 1398 logerr("ps_root_getifaddrs"); 1399 break; 1400 } 1401 } else 1402 #endif 1403 if (getifaddrs(&ifaddrs) == -1) { 1404 logerr("getifaddrs"); 1405 break; 1406 } 1407 for (ifa = ifaddrs; ifa; ifa = ifa->ifa_next) { 1408 if (ifa->ifa_addr == NULL) 1409 continue; 1410 if (sa_cmp(ifa->ifa_addr, sa) == 0 && 1411 strcmp(ifa->ifa_name, ifp->name) == 0) 1412 break; 1413 } 1414 #ifdef PRIVSEP_GETIFADDRS 1415 if (IN_PRIVSEP(ctx)) 1416 free(ifaddrs); 1417 else 1418 #endif 1419 freeifaddrs(ifaddrs); 1420 if (ifam->ifam_type == RTM_DELADDR) { 1421 if (ifa != NULL) 1422 break; 1423 } else { 1424 if (ifa == NULL) 1425 break; 1426 } 1427 #endif 1428 1429 #ifdef HAVE_IFAM_ADDRFLAGS 1430 flags = ifam->ifam_addrflags; 1431 #else 1432 flags = 0; 1433 #endif 1434 1435 ipv4_handleifa(ctx, ifam->ifam_type, NULL, ifp->name, 1436 &addr, &mask, &bcast, flags, pid); 1437 break; 1438 } 1439 #endif 1440 #ifdef INET6 1441 case AF_INET6: 1442 { 1443 struct in6_addr addr6, mask6; 1444 const struct sockaddr_in6 *sin6; 1445 1446 sin6 = (const void *)rti_info[RTAX_IFA]; 1447 addr6 = sin6->sin6_addr; 1448 sin6 = (const void *)rti_info[RTAX_NETMASK]; 1449 mask6 = sin6->sin6_addr; 1450 1451 /* 1452 * If the address was deleted, lets check if it's 1453 * a late message and it still exists (maybe modified). 1454 * If so, ignore it as deleting an address causes 1455 * dhcpcd to drop any lease to which it belongs. 1456 * Also check an added address was really added. 1457 */ 1458 flags = if_addrflags6(ifp, &addr6, NULL); 1459 if (flags == -1) { 1460 if (errno != ENXIO && errno != EADDRNOTAVAIL) 1461 logerr("%s: if_addrflags6", __func__); 1462 if (ifam->ifam_type != RTM_DELADDR) 1463 break; 1464 flags = 0; 1465 } else if (ifam->ifam_type == RTM_DELADDR) 1466 break; 1467 1468 #ifdef __KAME__ 1469 if (IN6_IS_ADDR_LINKLOCAL(&addr6)) 1470 /* Remove the scope from the address */ 1471 addr6.s6_addr[2] = addr6.s6_addr[3] = '\0'; 1472 #endif 1473 1474 ipv6_handleifa(ctx, ifam->ifam_type, NULL, 1475 ifp->name, &addr6, ipv6_prefixlen(&mask6), flags, pid); 1476 break; 1477 } 1478 #endif 1479 } 1480 1481 return 0; 1482 } 1483 1484 static int 1485 if_dispatch(struct dhcpcd_ctx *ctx, const struct rt_msghdr *rtm) 1486 { 1487 1488 if (rtm->rtm_version != RTM_VERSION) 1489 return 0; 1490 1491 switch(rtm->rtm_type) { 1492 #ifdef RTM_IFANNOUNCE 1493 case RTM_IFANNOUNCE: 1494 return if_announce(ctx, (const void *)rtm); 1495 #endif 1496 case RTM_IFINFO: 1497 return if_ifinfo(ctx, (const void *)rtm); 1498 case RTM_ADD: /* FALLTHROUGH */ 1499 case RTM_CHANGE: /* FALLTHROUGH */ 1500 case RTM_DELETE: /* FALLTHROUGH */ 1501 case RTM_MISS: 1502 return if_rtm(ctx, (const void *)rtm); 1503 #ifdef RTM_CHGADDR 1504 case RTM_CHGADDR: /* FALLTHROUGH */ 1505 #endif 1506 case RTM_DELADDR: /* FALLTHROUGH */ 1507 case RTM_NEWADDR: 1508 return if_ifa(ctx, (const void *)rtm); 1509 #ifdef RTM_DESYNC 1510 case RTM_DESYNC: 1511 dhcpcd_linkoverflow(ctx); 1512 #elif !defined(SO_RERROR) 1513 #warning cannot detect route socket overflow within kernel 1514 #endif 1515 } 1516 1517 return 0; 1518 } 1519 1520 static int 1521 if_missfilter0(struct dhcpcd_ctx *ctx, struct interface *ifp, 1522 struct sockaddr *sa) 1523 { 1524 size_t salen = (size_t)RT_ROUNDUP(sa->sa_len); 1525 size_t newlen = ctx->rt_missfilterlen + salen; 1526 size_t diff = salen - (sa->sa_len); 1527 uint8_t *cp; 1528 1529 if (ctx->rt_missfiltersize < newlen) { 1530 void *n = realloc(ctx->rt_missfilter, newlen); 1531 if (n == NULL) 1532 return -1; 1533 ctx->rt_missfilter = n; 1534 ctx->rt_missfiltersize = newlen; 1535 } 1536 1537 #ifdef INET6 1538 if (sa->sa_family == AF_INET6) 1539 ipv6_setscope(satosin6(sa), ifp->index); 1540 #else 1541 UNUSED(ifp); 1542 #endif 1543 1544 cp = ctx->rt_missfilter + ctx->rt_missfilterlen; 1545 memcpy(cp, sa, sa->sa_len); 1546 if (diff != 0) 1547 memset(cp + sa->sa_len, 0, diff); 1548 ctx->rt_missfilterlen += salen; 1549 1550 #ifdef INET6 1551 if (sa->sa_family == AF_INET6) 1552 ipv6_setscope(satosin6(sa), 0); 1553 #endif 1554 1555 return 0; 1556 } 1557 1558 int 1559 if_missfilter(struct interface *ifp, struct sockaddr *sa) 1560 { 1561 1562 return if_missfilter0(ifp->ctx, ifp, sa); 1563 } 1564 1565 int 1566 if_missfilter_apply(struct dhcpcd_ctx *ctx) 1567 { 1568 #ifdef RO_MISSFILTER 1569 if (ctx->rt_missfilterlen == 0) { 1570 struct sockaddr sa = { 1571 .sa_family = AF_UNSPEC, 1572 .sa_len = sizeof(sa), 1573 }; 1574 1575 if (if_missfilter0(ctx, NULL, &sa) == -1) 1576 return -1; 1577 } 1578 1579 return setsockopt(ctx->link_fd, PF_ROUTE, RO_MISSFILTER, 1580 ctx->rt_missfilter, (socklen_t)ctx->rt_missfilterlen); 1581 #else 1582 #warning kernel does not support RTM_MISS DST filtering 1583 UNUSED(ctx); 1584 errno = ENOTSUP; 1585 return -1; 1586 #endif 1587 } 1588 1589 __CTASSERT(offsetof(struct rt_msghdr, rtm_msglen) == 0); 1590 int 1591 if_handlelink(struct dhcpcd_ctx *ctx) 1592 { 1593 struct rtm rtm; 1594 ssize_t len; 1595 1596 len = read(ctx->link_fd, &rtm, sizeof(rtm)); 1597 if (len == -1) 1598 return -1; 1599 if (len == 0) 1600 return 0; 1601 if ((size_t)len < sizeof(rtm.hdr.rtm_msglen) || 1602 len != rtm.hdr.rtm_msglen) 1603 { 1604 errno = EINVAL; 1605 return -1; 1606 } 1607 /* 1608 * Coverity thinks that the data could be tainted from here. 1609 * I have no idea how because the length of the data we read 1610 * is guarded by len and checked to match rtm_msglen. 1611 * The issue seems to be related to extracting the addresses 1612 * at the end of the header, but seems to have no issues with the 1613 * equivalent call in if_initrt. 1614 */ 1615 /* coverity[tainted_data] */ 1616 return if_dispatch(ctx, &rtm.hdr); 1617 } 1618 1619 #ifndef SYS_NMLN /* OSX */ 1620 # define SYS_NMLN __SYS_NAMELEN 1621 #endif 1622 #ifndef HW_MACHINE_ARCH 1623 # ifdef HW_MODEL /* OpenBSD */ 1624 # define HW_MACHINE_ARCH HW_MODEL 1625 # endif 1626 #endif 1627 int 1628 if_machinearch(char *str, size_t len) 1629 { 1630 int mib[2] = { CTL_HW, HW_MACHINE_ARCH }; 1631 1632 return sysctl(mib, sizeof(mib) / sizeof(mib[0]), str, &len, NULL, 0); 1633 } 1634 1635 #ifdef INET6 1636 #if (defined(IPV6CTL_ACCEPT_RTADV) && !defined(ND6_IFF_ACCEPT_RTADV)) || \ 1637 defined(IPV6CTL_FORWARDING) 1638 #define get_inet6_sysctl(code) inet6_sysctl(code, 0, 0) 1639 #define set_inet6_sysctl(code, val) inet6_sysctl(code, val, 1) 1640 static int 1641 inet6_sysctl(int code, int val, int action) 1642 { 1643 int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 }; 1644 size_t size; 1645 1646 mib[3] = code; 1647 size = sizeof(val); 1648 if (action) { 1649 if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), 1650 NULL, 0, &val, size) == -1) 1651 return -1; 1652 return 0; 1653 } 1654 if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &val, &size, NULL, 0) == -1) 1655 return -1; 1656 return val; 1657 } 1658 #endif 1659 1660 int 1661 if_applyra(const struct ra *rap) 1662 { 1663 #ifdef SIOCSIFINFO_IN6 1664 struct in6_ndireq nd = { .ndi.chlim = 0 }; 1665 struct dhcpcd_ctx *ctx = rap->iface->ctx; 1666 int error; 1667 1668 strlcpy(nd.ifname, rap->iface->name, sizeof(nd.ifname)); 1669 1670 #ifdef IPV6CTL_ACCEPT_RTADV 1671 struct priv *priv = ctx->priv; 1672 1673 /* 1674 * NetBSD changed SIOCSIFINFO_IN6 to NOT set flags when kernel 1675 * RA was removed, however both FreeBSD and DragonFlyBSD still do. 1676 * linkmtu was also removed. 1677 * Hopefully this guard will still work if either remove kernel RA. 1678 */ 1679 if (ioctl(priv->pf_inet6_fd, SIOCGIFINFO_IN6, &nd, sizeof(nd)) == -1) 1680 return -1; 1681 1682 nd.ndi.linkmtu = rap->mtu; 1683 #endif 1684 1685 nd.ndi.chlim = rap->hoplimit; 1686 nd.ndi.retrans = rap->retrans; 1687 nd.ndi.basereachable = rap->reachable; 1688 error = if_ioctl6(ctx, SIOCSIFINFO_IN6, &nd, sizeof(nd)); 1689 #ifdef IPV6CTL_ACCEPT_RTADV 1690 if (error == -1 && errno == EINVAL) { 1691 /* 1692 * Very likely that this is caused by a dodgy MTU 1693 * setting specific to the interface. 1694 * Let's set it to "unspecified" and try again. 1695 * Doesn't really matter as we fix the MTU against the 1696 * routes we add as not all OS support SIOCSIFINFO_IN6. 1697 */ 1698 nd.ndi.linkmtu = 0; 1699 error = if_ioctl6(ctx, SIOCSIFINFO_IN6, &nd, sizeof(nd)); 1700 } 1701 #endif 1702 return error; 1703 #else 1704 #warning OS does not allow setting of RA bits hoplimit, retrans or reachable 1705 UNUSED(rap); 1706 return 0; 1707 #endif 1708 } 1709 1710 #ifndef IPV6CTL_FORWARDING 1711 #define get_inet6_sysctlbyname(code) inet6_sysctlbyname(code, 0, 0) 1712 #define set_inet6_sysctlbyname(code, val) inet6_sysctlbyname(code, val, 1) 1713 static int 1714 inet6_sysctlbyname(const char *name, int val, int action) 1715 { 1716 size_t size; 1717 1718 size = sizeof(val); 1719 if (action) { 1720 if (sysctlbyname(name, NULL, 0, &val, size) == -1) 1721 return -1; 1722 return 0; 1723 } 1724 if (sysctlbyname(name, &val, &size, NULL, 0) == -1) 1725 return -1; 1726 return val; 1727 } 1728 #endif 1729 1730 int 1731 ip6_forwarding(__unused const char *ifname) 1732 { 1733 int val; 1734 1735 #ifdef IPV6CTL_FORWARDING 1736 val = get_inet6_sysctl(IPV6CTL_FORWARDING); 1737 #else 1738 val = get_inet6_sysctlbyname("net.inet6.ip6.forwarding"); 1739 #endif 1740 return val < 0 ? 0 : val; 1741 } 1742 1743 #ifdef SIOCIFAFATTACH 1744 static int 1745 if_af_attach(const struct interface *ifp, int af) 1746 { 1747 struct if_afreq ifar; 1748 1749 strlcpy(ifar.ifar_name, ifp->name, sizeof(ifar.ifar_name)); 1750 ifar.ifar_af = af; 1751 return if_ioctl6(ifp->ctx, SIOCIFAFATTACH, &ifar, sizeof(ifar)); 1752 } 1753 #endif 1754 1755 #ifdef SIOCGIFXFLAGS 1756 static int 1757 if_set_ifxflags(const struct interface *ifp) 1758 { 1759 struct ifreq ifr; 1760 int flags; 1761 struct priv *priv = ifp->ctx->priv; 1762 1763 strlcpy(ifr.ifr_name, ifp->name, sizeof(ifr.ifr_name)); 1764 if (ioctl(priv->pf_inet6_fd, SIOCGIFXFLAGS, &ifr) == -1) 1765 return -1; 1766 flags = ifr.ifr_flags; 1767 #ifdef IFXF_NOINET6 1768 flags &= ~IFXF_NOINET6; 1769 #endif 1770 /* 1771 * If not doing autoconf, don't disable the kernel from doing it. 1772 * If we need to, we should have another option actively disable it. 1773 * 1774 * OpenBSD moved from kernel based SLAAC to userland via slaacd(8). 1775 * It has a similar featureset to dhcpcd such as stable private 1776 * addresses, but lacks the ability to handle DNS inside the RA 1777 * which is a serious shortfall in this day and age. 1778 * Appease their user base by working alongside slaacd(8) if 1779 * dhcpcd is instructed not to do auto configuration of addresses. 1780 */ 1781 #if defined(ND6_IFF_ACCEPT_RTADV) 1782 #define BSD_AUTOCONF DHCPCD_IPV6RS 1783 #else 1784 #define BSD_AUTOCONF DHCPCD_IPV6RA_AUTOCONF 1785 #endif 1786 if (ifp->options->options & BSD_AUTOCONF) 1787 flags &= ~IFXF_AUTOCONF6; 1788 if (ifr.ifr_flags == flags) 1789 return 0; 1790 ifr.ifr_flags = flags; 1791 return if_ioctl6(ifp->ctx, SIOCSIFXFLAGS, &ifr, sizeof(ifr)); 1792 } 1793 #endif 1794 1795 /* OpenBSD removed ND6 flags entirely, so we need to check for their 1796 * existance. */ 1797 #if defined(ND6_IFF_AUTO_LINKLOCAL) || \ 1798 defined(ND6_IFF_PERFORMNUD) || \ 1799 defined(ND6_IFF_ACCEPT_RTADV) || \ 1800 defined(ND6_IFF_OVERRIDE_RTADV) || \ 1801 defined(ND6_IFF_IFDISABLED) 1802 #define ND6_NDI_FLAGS 1803 #endif 1804 1805 void 1806 if_disable_rtadv(void) 1807 { 1808 #if defined(IPV6CTL_ACCEPT_RTADV) && !defined(ND6_IFF_ACCEPT_RTADV) 1809 int ra = get_inet6_sysctl(IPV6CTL_ACCEPT_RTADV); 1810 1811 if (ra == -1) { 1812 if (errno != ENOENT) 1813 logerr("IPV6CTL_ACCEPT_RTADV"); 1814 else if (ra != 0) 1815 if (set_inet6_sysctl(IPV6CTL_ACCEPT_RTADV, 0) == -1) 1816 logerr("IPV6CTL_ACCEPT_RTADV"); 1817 } 1818 #endif 1819 } 1820 1821 void 1822 if_setup_inet6(const struct interface *ifp) 1823 { 1824 struct priv *priv; 1825 int s; 1826 #ifdef ND6_NDI_FLAGS 1827 struct in6_ndireq nd; 1828 int flags; 1829 #endif 1830 1831 priv = (struct priv *)ifp->ctx->priv; 1832 s = priv->pf_inet6_fd; 1833 1834 #ifdef ND6_NDI_FLAGS 1835 memset(&nd, 0, sizeof(nd)); 1836 strlcpy(nd.ifname, ifp->name, sizeof(nd.ifname)); 1837 if (ioctl(s, SIOCGIFINFO_IN6, &nd) == -1) 1838 logerr("%s: SIOCGIFINFO_FLAGS", ifp->name); 1839 flags = (int)nd.ndi.flags; 1840 #endif 1841 1842 #ifdef ND6_IFF_AUTO_LINKLOCAL 1843 /* Unlike the kernel, dhcpcd make make a stable private address. */ 1844 flags &= ~ND6_IFF_AUTO_LINKLOCAL; 1845 #endif 1846 1847 #ifdef ND6_IFF_PERFORMNUD 1848 /* NUD is kind of essential. */ 1849 flags |= ND6_IFF_PERFORMNUD; 1850 #endif 1851 1852 #ifdef ND6_IFF_IFDISABLED 1853 /* Ensure the interface is not disabled. */ 1854 flags &= ~ND6_IFF_IFDISABLED; 1855 #endif 1856 1857 /* 1858 * If not doing autoconf, don't disable the kernel from doing it. 1859 * If we need to, we should have another option actively disable it. 1860 */ 1861 #ifdef ND6_IFF_ACCEPT_RTADV 1862 if (ifp->options->options & DHCPCD_IPV6RS) 1863 flags &= ~ND6_IFF_ACCEPT_RTADV; 1864 #ifdef ND6_IFF_OVERRIDE_RTADV 1865 if (ifp->options->options & DHCPCD_IPV6RS) 1866 flags |= ND6_IFF_OVERRIDE_RTADV; 1867 #endif 1868 #endif 1869 1870 #ifdef ND6_NDI_FLAGS 1871 if (nd.ndi.flags != (uint32_t)flags) { 1872 nd.ndi.flags = (uint32_t)flags; 1873 if (if_ioctl6(ifp->ctx, SIOCSIFINFO_FLAGS, 1874 &nd, sizeof(nd)) == -1) 1875 logerr("%s: SIOCSIFINFO_FLAGS", ifp->name); 1876 } 1877 #endif 1878 1879 /* Enabling IPv6 by whatever means must be the 1880 * last action undertaken to ensure kernel RS and 1881 * LLADDR auto configuration are disabled where applicable. */ 1882 #ifdef SIOCIFAFATTACH 1883 if (if_af_attach(ifp, AF_INET6) == -1) 1884 logerr("%s: if_af_attach", ifp->name); 1885 #endif 1886 1887 #ifdef SIOCGIFXFLAGS 1888 if (if_set_ifxflags(ifp) == -1) 1889 logerr("%s: set_ifxflags", ifp->name); 1890 #endif 1891 1892 #ifdef SIOCSRTRFLUSH_IN6 1893 /* Flush the kernel knowledge of advertised routers 1894 * and prefixes so the kernel does not expire prefixes 1895 * and default routes we are trying to own. */ 1896 if (ifp->options->options & DHCPCD_IPV6RS) { 1897 struct in6_ifreq ifr; 1898 1899 memset(&ifr, 0, sizeof(ifr)); 1900 strlcpy(ifr.ifr_name, ifp->name, sizeof(ifr.ifr_name)); 1901 if (if_ioctl6(ifp->ctx, SIOCSRTRFLUSH_IN6, 1902 &ifr, sizeof(ifr)) == -1 && 1903 errno != ENOTSUP && errno != ENOTTY) 1904 logwarn("SIOCSRTRFLUSH_IN6 %d", errno); 1905 #ifdef SIOCSPFXFLUSH_IN6 1906 if (if_ioctl6(ifp->ctx, SIOCSPFXFLUSH_IN6, 1907 &ifr, sizeof(ifr)) == -1 && 1908 errno != ENOTSUP && errno != ENOTTY) 1909 logwarn("SIOCSPFXFLUSH_IN6"); 1910 #endif 1911 } 1912 #endif 1913 } 1914 #endif 1915