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(__unused 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 return LINK_UNKNOWN; 403 return LINK_DOWN; 404 } 405 406 static void 407 if_linkaddr(struct sockaddr_dl *sdl, const struct interface *ifp) 408 { 409 410 memset(sdl, 0, sizeof(*sdl)); 411 sdl->sdl_family = AF_LINK; 412 sdl->sdl_len = sizeof(*sdl); 413 sdl->sdl_nlen = sdl->sdl_alen = sdl->sdl_slen = 0; 414 sdl->sdl_index = (unsigned short)ifp->index; 415 } 416 417 static int 418 if_getssid1(struct dhcpcd_ctx *ctx, const char *ifname, void *ssid) 419 { 420 int retval = -1; 421 #if defined(SIOCG80211NWID) 422 struct ieee80211_nwid nwid; 423 #elif defined(IEEE80211_IOC_SSID) 424 struct ieee80211req ireq; 425 char nwid[IEEE80211_NWID_LEN]; 426 #endif 427 428 #if defined(SIOCG80211NWID) /* NetBSD */ 429 memset(&nwid, 0, sizeof(nwid)); 430 if (if_indirect_ioctl(ctx, ifname, SIOCG80211NWID, 431 &nwid, sizeof(nwid)) == 0) 432 { 433 if (ssid == NULL) 434 retval = nwid.i_len; 435 else if (nwid.i_len > IF_SSIDLEN) 436 errno = ENOBUFS; 437 else { 438 retval = nwid.i_len; 439 memcpy(ssid, nwid.i_nwid, nwid.i_len); 440 } 441 } 442 #elif defined(IEEE80211_IOC_SSID) /* FreeBSD */ 443 memset(&ireq, 0, sizeof(ireq)); 444 strlcpy(ireq.i_name, ifname, sizeof(ireq.i_name)); 445 ireq.i_type = IEEE80211_IOC_SSID; 446 ireq.i_val = -1; 447 memset(nwid, 0, sizeof(nwid)); 448 ireq.i_data = &nwid; 449 if (ioctl(ctx->pf_inet_fd, SIOCG80211, &ireq) == 0) { 450 if (ssid == NULL) 451 retval = ireq.i_len; 452 else if (ireq.i_len > IF_SSIDLEN) 453 errno = ENOBUFS; 454 else { 455 retval = ireq.i_len; 456 memcpy(ssid, nwid, ireq.i_len); 457 } 458 } 459 #else 460 errno = ENOSYS; 461 #endif 462 463 return retval; 464 } 465 466 int 467 if_getssid(struct interface *ifp) 468 { 469 int r; 470 471 r = if_getssid1(ifp->ctx, ifp->name, ifp->ssid); 472 if (r != -1) 473 ifp->ssid_len = (unsigned int)r; 474 else 475 ifp->ssid_len = 0; 476 ifp->ssid[ifp->ssid_len] = '\0'; 477 return r; 478 } 479 480 /* 481 * FreeBSD allows for Virtual Access Points 482 * We need to check if the interface is a Virtual Interface Master 483 * and if so, don't use it. 484 * This check is made by virtue of being a IEEE80211 device but 485 * returning the SSID gives an error. 486 */ 487 int 488 if_vimaster(struct dhcpcd_ctx *ctx, const char *ifname) 489 { 490 int r; 491 struct ifmediareq ifmr = { .ifm_active = 0 }; 492 493 strlcpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name)); 494 r = ioctl(ctx->pf_inet_fd, SIOCGIFMEDIA, &ifmr); 495 if (r == -1) 496 return -1; 497 if (ifmr.ifm_status & IFM_AVALID && 498 IFM_TYPE(ifmr.ifm_active) == IFM_IEEE80211) 499 { 500 if (if_getssid1(ctx, ifname, NULL) == -1) 501 return 1; 502 } 503 return 0; 504 } 505 506 unsigned short 507 if_vlanid(const struct interface *ifp) 508 { 509 #ifdef SIOCGETVLAN 510 struct vlanreq vlr = { .vlr_tag = 0 }; 511 512 if (if_indirect_ioctl(ifp->ctx, ifp->name, SIOCGETVLAN, 513 &vlr, sizeof(vlr)) != 0) 514 return 0; /* 0 means no VLANID */ 515 return vlr.vlr_tag; 516 #elif defined(SIOCGVNETID) 517 struct ifreq ifr = { .ifr_vnetid = 0 }; 518 519 strlcpy(ifr.ifr_name, ifp->name, sizeof(ifr.ifr_name)); 520 if (ioctl(ifp->ctx->pf_inet_fd, SIOCGVNETID, &ifr) != 0) 521 return 0; /* 0 means no VLANID */ 522 return ifr.ifr_vnetid; 523 #else 524 UNUSED(ifp); 525 return 0; /* 0 means no VLANID */ 526 #endif 527 } 528 529 static int 530 get_addrs(int type, const void *data, size_t data_len, 531 const struct sockaddr **sa) 532 { 533 const char *cp, *ep; 534 int i; 535 536 cp = data; 537 ep = cp + data_len; 538 for (i = 0; i < RTAX_MAX; i++) { 539 if (type & (1 << i)) { 540 if (cp >= ep) { 541 errno = EINVAL; 542 return -1; 543 } 544 sa[i] = (const struct sockaddr *)cp; 545 RT_ADVANCE(cp, sa[i]); 546 } else 547 sa[i] = NULL; 548 } 549 550 return 0; 551 } 552 553 static struct interface * 554 if_findsdl(struct dhcpcd_ctx *ctx, const struct sockaddr_dl *sdl) 555 { 556 557 if (sdl->sdl_index) 558 return if_findindex(ctx->ifaces, sdl->sdl_index); 559 560 if (sdl->sdl_nlen) { 561 char ifname[IF_NAMESIZE]; 562 563 memcpy(ifname, sdl->sdl_data, sdl->sdl_nlen); 564 ifname[sdl->sdl_nlen] = '\0'; 565 return if_find(ctx->ifaces, ifname); 566 } 567 if (sdl->sdl_alen) { 568 struct interface *ifp; 569 570 TAILQ_FOREACH(ifp, ctx->ifaces, next) { 571 if (ifp->hwlen == sdl->sdl_alen && 572 memcmp(ifp->hwaddr, 573 sdl->sdl_data, sdl->sdl_alen) == 0) 574 return ifp; 575 } 576 } 577 578 errno = ENOENT; 579 return NULL; 580 } 581 582 static struct interface * 583 if_findsa(struct dhcpcd_ctx *ctx, const struct sockaddr *sa) 584 { 585 if (sa == NULL) { 586 errno = EINVAL; 587 return NULL; 588 } 589 590 switch (sa->sa_family) { 591 case AF_LINK: 592 { 593 const struct sockaddr_dl *sdl; 594 595 sdl = (const void *)sa; 596 return if_findsdl(ctx, sdl); 597 } 598 #ifdef INET 599 case AF_INET: 600 { 601 const struct sockaddr_in *sin; 602 struct ipv4_addr *ia; 603 604 sin = (const void *)sa; 605 if ((ia = ipv4_findmaskaddr(ctx, &sin->sin_addr))) 606 return ia->iface; 607 break; 608 } 609 #endif 610 #ifdef INET6 611 case AF_INET6: 612 { 613 const struct sockaddr_in6 *sin; 614 unsigned int scope; 615 struct ipv6_addr *ia; 616 617 sin = (const void *)sa; 618 scope = ipv6_getscope(sin); 619 if (scope != 0) 620 return if_findindex(ctx->ifaces, scope); 621 if ((ia = ipv6_findmaskaddr(ctx, &sin->sin6_addr))) 622 return ia->iface; 623 break; 624 } 625 #endif 626 default: 627 errno = EAFNOSUPPORT; 628 return NULL; 629 } 630 631 errno = ENOENT; 632 return NULL; 633 } 634 635 static void 636 if_copysa(struct sockaddr *dst, const struct sockaddr *src) 637 { 638 639 assert(dst != NULL); 640 assert(src != NULL); 641 642 memcpy(dst, src, src->sa_len); 643 #if defined(INET6) && defined(__KAME__) 644 if (dst->sa_family == AF_INET6) { 645 struct in6_addr *in6; 646 647 in6 = &satosin6(dst)->sin6_addr; 648 if (IN6_IS_ADDR_LINKLOCAL(in6)) 649 in6->s6_addr[2] = in6->s6_addr[3] = '\0'; 650 } 651 #endif 652 } 653 654 int 655 if_route(unsigned char cmd, const struct rt *rt) 656 { 657 struct dhcpcd_ctx *ctx; 658 struct rtm rtmsg; 659 struct rt_msghdr *rtm = &rtmsg.hdr; 660 char *bp = rtmsg.buffer; 661 struct sockaddr_dl sdl; 662 bool gateway_unspec; 663 664 assert(rt != NULL); 665 assert(rt->rt_ifp != NULL); 666 assert(rt->rt_ifp->ctx != NULL); 667 ctx = rt->rt_ifp->ctx; 668 669 #define ADDSA(sa) do { \ 670 memcpy(bp, (sa), (sa)->sa_len); \ 671 bp += RT_ROUNDUP((sa)->sa_len); \ 672 } while (0 /* CONSTCOND */) 673 674 memset(&rtmsg, 0, sizeof(rtmsg)); 675 rtm->rtm_version = RTM_VERSION; 676 rtm->rtm_type = cmd; 677 #ifdef __OpenBSD__ 678 rtm->rtm_pid = getpid(); 679 #endif 680 rtm->rtm_seq = ++ctx->seq; 681 rtm->rtm_flags = (int)rt->rt_flags; 682 rtm->rtm_addrs = RTA_DST; 683 #ifdef RTF_PINNED 684 if (cmd != RTM_ADD) 685 rtm->rtm_flags |= RTF_PINNED; 686 #endif 687 688 gateway_unspec = sa_is_unspecified(&rt->rt_gateway); 689 690 if (cmd == RTM_ADD || cmd == RTM_CHANGE) { 691 bool netmask_bcast = sa_is_allones(&rt->rt_netmask); 692 693 rtm->rtm_flags |= RTF_UP; 694 rtm->rtm_addrs |= RTA_GATEWAY; 695 if (!(rtm->rtm_flags & RTF_REJECT) && 696 !sa_is_loopback(&rt->rt_gateway)) 697 { 698 rtm->rtm_index = (unsigned short)rt->rt_ifp->index; 699 /* 700 * OpenBSD rejects the message for on-link routes. 701 * FreeBSD-12 kernel apparently panics. 702 * I can't replicate the panic, but better safe than sorry! 703 * https://roy.marples.name/archives/dhcpcd-discuss/0002286.html 704 * 705 * Neither OS currently allows IPv6 address sharing anyway, so let's 706 * try to encourage someone to fix that by logging a waring during compile. 707 */ 708 #if defined(__FreeBSD__) || defined(__OpenBSD__) 709 #warning kernel does not allow IPv6 address sharing 710 if (!gateway_unspec || rt->rt_dest.sa_family!=AF_INET6) 711 #endif 712 rtm->rtm_addrs |= RTA_IFP; 713 if (!sa_is_unspecified(&rt->rt_ifa)) 714 rtm->rtm_addrs |= RTA_IFA; 715 } 716 if (netmask_bcast) 717 rtm->rtm_flags |= RTF_HOST; 718 /* Network routes are cloning or connected if supported. 719 * All other routes are static. */ 720 if (gateway_unspec) { 721 #ifdef RTF_CLONING 722 rtm->rtm_flags |= RTF_CLONING; 723 #endif 724 #ifdef RTF_CONNECTED 725 rtm->rtm_flags |= RTF_CONNECTED; 726 #endif 727 #ifdef RTP_CONNECTED 728 rtm->rtm_priority = RTP_CONNECTED; 729 #endif 730 #ifdef RTF_CLONING 731 if (netmask_bcast) { 732 /* 733 * We add a cloning network route for a single 734 * host. Traffic to the host will generate a 735 * cloned route and the hardware address will 736 * resolve correctly. 737 * It might be more correct to use RTF_HOST 738 * instead of RTF_CLONING, and that does work, 739 * but some OS generate an arp warning 740 * diagnostic which we don't want to do. 741 */ 742 rtm->rtm_flags &= ~RTF_HOST; 743 } 744 #endif 745 } else 746 rtm->rtm_flags |= RTF_GATEWAY; 747 748 if (rt->rt_dflags & RTDF_STATIC) 749 rtm->rtm_flags |= RTF_STATIC; 750 751 if (rt->rt_mtu != 0) { 752 rtm->rtm_inits |= RTV_MTU; 753 rtm->rtm_rmx.rmx_mtu = rt->rt_mtu; 754 } 755 } 756 757 if (!(rtm->rtm_flags & RTF_HOST)) 758 rtm->rtm_addrs |= RTA_NETMASK; 759 760 if_linkaddr(&sdl, rt->rt_ifp); 761 762 ADDSA(&rt->rt_dest); 763 764 if (rtm->rtm_addrs & RTA_GATEWAY) { 765 if (gateway_unspec) 766 ADDSA((struct sockaddr *)&sdl); 767 else { 768 union sa_ss gateway; 769 770 if_copysa(&gateway.sa, &rt->rt_gateway); 771 #ifdef INET6 772 if (gateway.sa.sa_family == AF_INET6) 773 ipv6_setscope(&gateway.sin6, rt->rt_ifp->index); 774 #endif 775 ADDSA(&gateway.sa); 776 } 777 } 778 779 if (rtm->rtm_addrs & RTA_NETMASK) 780 ADDSA(&rt->rt_netmask); 781 782 if (rtm->rtm_addrs & RTA_IFP) 783 ADDSA((struct sockaddr *)&sdl); 784 785 if (rtm->rtm_addrs & RTA_IFA) 786 ADDSA(&rt->rt_ifa); 787 788 #undef ADDSA 789 790 rtm->rtm_msglen = (unsigned short)(bp - (char *)rtm); 791 792 #ifdef PRIVSEP 793 if (ctx->options & DHCPCD_PRIVSEP) { 794 if (ps_root_route(ctx, rtm, rtm->rtm_msglen) == -1) 795 return -1; 796 return 0; 797 } 798 #endif 799 if (write(ctx->link_fd, rtm, rtm->rtm_msglen) == -1) 800 return -1; 801 return 0; 802 } 803 804 static bool 805 if_realroute(const struct rt_msghdr *rtm) 806 { 807 808 #ifdef RTF_CLONED 809 if (rtm->rtm_flags & RTF_CLONED) 810 return false; 811 #endif 812 #ifdef RTF_WASCLONED 813 if (rtm->rtm_flags & RTF_WASCLONED) 814 return false; 815 #endif 816 #ifdef RTF_LOCAL 817 if (rtm->rtm_flags & RTF_LOCAL) 818 return false; 819 #endif 820 #ifdef RTF_BROADCAST 821 if (rtm->rtm_flags & RTF_BROADCAST) 822 return false; 823 #endif 824 return true; 825 } 826 827 static int 828 if_copyrt(struct dhcpcd_ctx *ctx, struct rt *rt, const struct rt_msghdr *rtm) 829 { 830 const struct sockaddr *rti_info[RTAX_MAX]; 831 832 if (!(rtm->rtm_addrs & RTA_DST)) { 833 errno = EINVAL; 834 return -1; 835 } 836 if (rtm->rtm_type != RTM_MISS && !(rtm->rtm_addrs & RTA_GATEWAY)) { 837 errno = EINVAL; 838 return -1; 839 } 840 841 if (get_addrs(rtm->rtm_addrs, (const char *)rtm + sizeof(*rtm), 842 rtm->rtm_msglen - sizeof(*rtm), rti_info) == -1) 843 return -1; 844 memset(rt, 0, sizeof(*rt)); 845 846 rt->rt_flags = (unsigned int)rtm->rtm_flags; 847 if_copysa(&rt->rt_dest, rti_info[RTAX_DST]); 848 if (rtm->rtm_addrs & RTA_NETMASK) { 849 if_copysa(&rt->rt_netmask, rti_info[RTAX_NETMASK]); 850 if (rt->rt_netmask.sa_family == 255) /* Why? */ 851 rt->rt_netmask.sa_family = rt->rt_dest.sa_family; 852 } 853 854 /* dhcpcd likes an unspecified gateway to indicate via the link. 855 * However we need to know if gateway was a link with an address. */ 856 if (rtm->rtm_addrs & RTA_GATEWAY) { 857 if (rti_info[RTAX_GATEWAY]->sa_family == AF_LINK) { 858 const struct sockaddr_dl *sdl; 859 860 sdl = (const struct sockaddr_dl*) 861 (const void *)rti_info[RTAX_GATEWAY]; 862 if (sdl->sdl_alen != 0) 863 rt->rt_dflags |= RTDF_GATELINK; 864 } else if (rtm->rtm_flags & RTF_GATEWAY) 865 if_copysa(&rt->rt_gateway, rti_info[RTAX_GATEWAY]); 866 } 867 868 if (rtm->rtm_addrs & RTA_IFA) 869 if_copysa(&rt->rt_ifa, rti_info[RTAX_IFA]); 870 871 rt->rt_mtu = (unsigned int)rtm->rtm_rmx.rmx_mtu; 872 873 if (rtm->rtm_index) 874 rt->rt_ifp = if_findindex(ctx->ifaces, rtm->rtm_index); 875 else if (rtm->rtm_addrs & RTA_IFP) 876 rt->rt_ifp = if_findsa(ctx, rti_info[RTAX_IFP]); 877 else if (rtm->rtm_addrs & RTA_GATEWAY) 878 rt->rt_ifp = if_findsa(ctx, rti_info[RTAX_GATEWAY]); 879 else 880 rt->rt_ifp = if_findsa(ctx, rti_info[RTAX_DST]); 881 882 if (rt->rt_ifp == NULL && rtm->rtm_type == RTM_MISS) 883 rt->rt_ifp = if_find(ctx->ifaces, "lo0"); 884 885 if (rt->rt_ifp == NULL) { 886 errno = ESRCH; 887 return -1; 888 } 889 return 0; 890 } 891 892 int 893 if_initrt(struct dhcpcd_ctx *ctx, rb_tree_t *kroutes, int af) 894 { 895 struct rt_msghdr *rtm; 896 int mib[6]; 897 size_t needed; 898 char *buf, *p, *end; 899 struct rt rt, *rtn; 900 901 mib[0] = CTL_NET; 902 mib[1] = PF_ROUTE; 903 mib[2] = 0; 904 mib[3] = af; 905 mib[4] = NET_RT_DUMP; 906 mib[5] = 0; 907 908 if (sysctl(mib, 6, NULL, &needed, NULL, 0) == -1) 909 return -1; 910 if (needed == 0) 911 return 0; 912 if ((buf = malloc(needed)) == NULL) 913 return -1; 914 if (sysctl(mib, 6, buf, &needed, NULL, 0) == -1) { 915 free(buf); 916 return -1; 917 } 918 919 end = buf + needed; 920 for (p = buf; p < end; p += rtm->rtm_msglen) { 921 rtm = (void *)p; 922 if (p + rtm->rtm_msglen >= end) { 923 errno = EINVAL; 924 break; 925 } 926 if (!if_realroute(rtm)) 927 continue; 928 if (if_copyrt(ctx, &rt, rtm) != 0) 929 continue; 930 if ((rtn = rt_new(rt.rt_ifp)) == NULL) { 931 logerr(__func__); 932 break; 933 } 934 memcpy(rtn, &rt, sizeof(*rtn)); 935 if (rb_tree_insert_node(kroutes, rtn) != rtn) 936 rt_free(rtn); 937 } 938 free(buf); 939 return p == end ? 0 : -1; 940 } 941 942 #ifdef INET 943 int 944 if_address(unsigned char cmd, const struct ipv4_addr *ia) 945 { 946 int r; 947 struct in_aliasreq ifra; 948 struct dhcpcd_ctx *ctx = ia->iface->ctx; 949 950 memset(&ifra, 0, sizeof(ifra)); 951 strlcpy(ifra.ifra_name, ia->iface->name, sizeof(ifra.ifra_name)); 952 953 #define ADDADDR(var, addr) do { \ 954 (var)->sin_family = AF_INET; \ 955 (var)->sin_len = sizeof(*(var)); \ 956 (var)->sin_addr = *(addr); \ 957 } while (/*CONSTCOND*/0) 958 ADDADDR(&ifra.ifra_addr, &ia->addr); 959 ADDADDR(&ifra.ifra_mask, &ia->mask); 960 if (cmd == RTM_NEWADDR && ia->brd.s_addr != INADDR_ANY) 961 ADDADDR(&ifra.ifra_broadaddr, &ia->brd); 962 #undef ADDADDR 963 964 r = if_ioctl(ctx, 965 cmd == RTM_DELADDR ? SIOCDIFADDR : SIOCAIFADDR, &ifra,sizeof(ifra)); 966 return r; 967 } 968 969 #if !(defined(HAVE_IFADDRS_ADDRFLAGS) && defined(HAVE_IFAM_ADDRFLAGS)) 970 int 971 if_addrflags(const struct interface *ifp, const struct in_addr *addr, 972 __unused const char *alias) 973 { 974 #ifdef SIOCGIFAFLAG_IN 975 struct ifreq ifr; 976 struct sockaddr_in *sin; 977 978 memset(&ifr, 0, sizeof(ifr)); 979 strlcpy(ifr.ifr_name, ifp->name, sizeof(ifr.ifr_name)); 980 sin = (void *)&ifr.ifr_addr; 981 sin->sin_family = AF_INET; 982 sin->sin_addr = *addr; 983 if (ioctl(ifp->ctx->pf_inet_fd, SIOCGIFAFLAG_IN, &ifr) == -1) 984 return -1; 985 return ifr.ifr_addrflags; 986 #else 987 UNUSED(ifp); 988 UNUSED(addr); 989 return 0; 990 #endif 991 } 992 #endif 993 #endif /* INET */ 994 995 #ifdef INET6 996 static int 997 if_ioctl6(struct dhcpcd_ctx *ctx, unsigned long req, void *data, size_t len) 998 { 999 struct priv *priv; 1000 1001 #ifdef PRIVSEP 1002 if (ctx->options & DHCPCD_PRIVSEP) 1003 return (int)ps_root_ioctl6(ctx, req, data, len); 1004 #endif 1005 1006 priv = ctx->priv; 1007 return ioctl(priv->pf_inet6_fd, req, data, len); 1008 } 1009 1010 int 1011 if_address6(unsigned char cmd, const struct ipv6_addr *ia) 1012 { 1013 struct in6_aliasreq ifa = { .ifra_flags = 0 }; 1014 struct in6_addr mask; 1015 struct dhcpcd_ctx *ctx = ia->iface->ctx; 1016 1017 strlcpy(ifa.ifra_name, ia->iface->name, sizeof(ifa.ifra_name)); 1018 #if defined(__FreeBSD__) || defined(__DragonFly__) 1019 /* This is a bug - the kernel should work this out. */ 1020 if (ia->addr_flags & IN6_IFF_TENTATIVE) 1021 ifa.ifra_flags |= IN6_IFF_TENTATIVE; 1022 #endif 1023 #if (defined(__NetBSD__) || defined(__OpenBSD__)) && \ 1024 (defined(IPV6CTL_ACCEPT_RTADV) || defined(ND6_IFF_ACCEPT_RTADV)) 1025 /* These kernels don't accept userland setting IN6_IFF_AUTOCONF */ 1026 #else 1027 if (ia->flags & IPV6_AF_AUTOCONF) 1028 ifa.ifra_flags |= IN6_IFF_AUTOCONF; 1029 #endif 1030 #ifdef IPV6_MANAGETEMPADDR 1031 if (ia->flags & IPV6_AF_TEMPORARY) 1032 ifa.ifra_flags |= IN6_IFF_TEMPORARY; 1033 #endif 1034 1035 #define ADDADDR(v, addr) { \ 1036 (v)->sin6_family = AF_INET6; \ 1037 (v)->sin6_len = sizeof(*v); \ 1038 (v)->sin6_addr = *(addr); \ 1039 } 1040 1041 ADDADDR(&ifa.ifra_addr, &ia->addr); 1042 ipv6_setscope(&ifa.ifra_addr, ia->iface->index); 1043 ipv6_mask(&mask, ia->prefix_len); 1044 ADDADDR(&ifa.ifra_prefixmask, &mask); 1045 1046 #undef ADDADDR 1047 1048 /* 1049 * Every BSD kernel wants to add the prefix of the address to it's 1050 * list of RA received prefixes. 1051 * THIS IS WRONG because there (as the comments in the kernel state) 1052 * is no API for managing prefix lifetime and the kernel should not 1053 * pretend it's from a RA either. 1054 * 1055 * The issue is that the very first assigned prefix will inherit the 1056 * lifetime of the address, but any subsequent alteration of the 1057 * address OR it's lifetime will not affect the prefix lifetime. 1058 * As such, we cannot stop the prefix from timing out and then 1059 * constantly removing the prefix route dhcpcd is capable of adding 1060 * in it's absense. 1061 * 1062 * What we can do to mitigate the issue is to add the address with 1063 * infinite lifetimes, so the prefix route will never time out. 1064 * Once done, we can then set lifetimes on the address and all is good. 1065 * The downside of this approach is that we need to manually remove 1066 * the kernel route because it has no lifetime, but this is OK as 1067 * dhcpcd will handle this too. 1068 * 1069 * This issue is discussed on the NetBSD mailing lists here: 1070 * http://mail-index.netbsd.org/tech-net/2016/08/05/msg006044.html 1071 * 1072 * Fixed in NetBSD-7.99.36 1073 * NOT fixed in FreeBSD - bug 195197 1074 * Fixed in OpenBSD-5.9 1075 */ 1076 1077 #if !((defined(__NetBSD_Version__) && __NetBSD_Version__ >= 799003600) || \ 1078 (defined(__OpenBSD__) && OpenBSD >= 201605)) 1079 if (cmd == RTM_NEWADDR && !(ia->flags & IPV6_AF_ADDED)) { 1080 ifa.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 1081 ifa.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 1082 (void)if_ioctl6(ctx, SIOCAIFADDR_IN6, &ifa, sizeof(ifa)); 1083 } 1084 #endif 1085 1086 #if defined(__OpenBSD__) && OpenBSD <= 201705 1087 /* BUT OpenBSD older than 6.2 does not reset the address lifetime 1088 * for subsequent calls... 1089 * Luckily dhcpcd will remove the lease when it expires so 1090 * just set an infinite lifetime, unless a temporary address. */ 1091 if (ifa.ifra_flags & IN6_IFF_PRIVACY) { 1092 ifa.ifra_lifetime.ia6t_vltime = ia->prefix_vltime; 1093 ifa.ifra_lifetime.ia6t_pltime = ia->prefix_pltime; 1094 } else { 1095 ifa.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 1096 ifa.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 1097 } 1098 #else 1099 ifa.ifra_lifetime.ia6t_vltime = ia->prefix_vltime; 1100 ifa.ifra_lifetime.ia6t_pltime = ia->prefix_pltime; 1101 #endif 1102 1103 return if_ioctl6(ctx, 1104 cmd == RTM_DELADDR ? SIOCDIFADDR_IN6 : SIOCAIFADDR_IN6, 1105 &ifa, sizeof(ifa)); 1106 } 1107 1108 int 1109 if_addrflags6(const struct interface *ifp, const struct in6_addr *addr, 1110 __unused const char *alias) 1111 { 1112 int flags; 1113 struct in6_ifreq ifr6; 1114 struct priv *priv; 1115 1116 memset(&ifr6, 0, sizeof(ifr6)); 1117 strlcpy(ifr6.ifr_name, ifp->name, sizeof(ifr6.ifr_name)); 1118 ifr6.ifr_addr.sin6_family = AF_INET6; 1119 ifr6.ifr_addr.sin6_addr = *addr; 1120 ipv6_setscope(&ifr6.ifr_addr, ifp->index); 1121 priv = (struct priv *)ifp->ctx->priv; 1122 if (ioctl(priv->pf_inet6_fd, SIOCGIFAFLAG_IN6, &ifr6) != -1) 1123 flags = ifr6.ifr_ifru.ifru_flags6; 1124 else 1125 flags = -1; 1126 return flags; 1127 } 1128 1129 int 1130 if_getlifetime6(struct ipv6_addr *ia) 1131 { 1132 struct in6_ifreq ifr6; 1133 time_t t; 1134 struct in6_addrlifetime *lifetime; 1135 struct priv *priv; 1136 1137 memset(&ifr6, 0, sizeof(ifr6)); 1138 strlcpy(ifr6.ifr_name, ia->iface->name, sizeof(ifr6.ifr_name)); 1139 ifr6.ifr_addr.sin6_family = AF_INET6; 1140 ifr6.ifr_addr.sin6_addr = ia->addr; 1141 ipv6_setscope(&ifr6.ifr_addr, ia->iface->index); 1142 priv = (struct priv *)ia->iface->ctx->priv; 1143 if (ioctl(priv->pf_inet6_fd, SIOCGIFALIFETIME_IN6, &ifr6) == -1) 1144 return -1; 1145 clock_gettime(CLOCK_MONOTONIC, &ia->created); 1146 1147 #if defined(__FreeBSD__) || defined(__DragonFly__) 1148 t = ia->created.tv_sec; 1149 #else 1150 t = time(NULL); 1151 #endif 1152 1153 lifetime = &ifr6.ifr_ifru.ifru_lifetime; 1154 if (lifetime->ia6t_preferred) 1155 ia->prefix_pltime = (uint32_t)(lifetime->ia6t_preferred - 1156 MIN(t, lifetime->ia6t_preferred)); 1157 else 1158 ia->prefix_pltime = ND6_INFINITE_LIFETIME; 1159 if (lifetime->ia6t_expire) { 1160 ia->prefix_vltime = (uint32_t)(lifetime->ia6t_expire - 1161 MIN(t, lifetime->ia6t_expire)); 1162 /* Calculate the created time */ 1163 ia->created.tv_sec -= lifetime->ia6t_vltime - ia->prefix_vltime; 1164 } else 1165 ia->prefix_vltime = ND6_INFINITE_LIFETIME; 1166 return 0; 1167 } 1168 #endif 1169 1170 static int 1171 if_announce(struct dhcpcd_ctx *ctx, const struct if_announcemsghdr *ifan) 1172 { 1173 1174 if (ifan->ifan_msglen < sizeof(*ifan)) { 1175 errno = EINVAL; 1176 return -1; 1177 } 1178 1179 switch(ifan->ifan_what) { 1180 case IFAN_ARRIVAL: 1181 return dhcpcd_handleinterface(ctx, 1, ifan->ifan_name); 1182 case IFAN_DEPARTURE: 1183 return dhcpcd_handleinterface(ctx, -1, ifan->ifan_name); 1184 } 1185 1186 return 0; 1187 } 1188 1189 static int 1190 if_ifinfo(struct dhcpcd_ctx *ctx, const struct if_msghdr *ifm) 1191 { 1192 struct interface *ifp; 1193 int link_state; 1194 1195 if (ifm->ifm_msglen < sizeof(*ifm)) { 1196 errno = EINVAL; 1197 return -1; 1198 } 1199 1200 if ((ifp = if_findindex(ctx->ifaces, ifm->ifm_index)) == NULL) 1201 return 0; 1202 1203 link_state = if_carrier(ifp, &ifm->ifm_data); 1204 dhcpcd_handlecarrier(ifp, link_state, (unsigned int)ifm->ifm_flags); 1205 return 0; 1206 } 1207 1208 static int 1209 if_rtm(struct dhcpcd_ctx *ctx, const struct rt_msghdr *rtm) 1210 { 1211 struct rt rt; 1212 1213 if (rtm->rtm_msglen < sizeof(*rtm)) { 1214 errno = EINVAL; 1215 return -1; 1216 } 1217 1218 /* Ignore errors. */ 1219 if (rtm->rtm_errno != 0) 1220 return 0; 1221 1222 /* Ignore messages from ourself. */ 1223 #ifdef PRIVSEP 1224 if (ctx->ps_root_pid != 0) { 1225 if (rtm->rtm_pid == ctx->ps_root_pid) 1226 return 0; 1227 } 1228 #endif 1229 1230 if (if_copyrt(ctx, &rt, rtm) == -1) 1231 return errno == ENOTSUP ? 0 : -1; 1232 1233 #ifdef INET6 1234 /* 1235 * BSD announces host routes. 1236 * As such, we should be notified of reachability by its 1237 * existance with a hardware address. 1238 * Ensure we don't call this for a newly incomplete state. 1239 */ 1240 if (rt.rt_dest.sa_family == AF_INET6 && 1241 (rt.rt_flags & RTF_HOST || rtm->rtm_type == RTM_MISS) && 1242 !(rtm->rtm_type == RTM_ADD && !(rt.rt_dflags & RTDF_GATELINK))) 1243 { 1244 bool reachable; 1245 1246 reachable = (rtm->rtm_type == RTM_ADD || 1247 rtm->rtm_type == RTM_CHANGE) && 1248 rt.rt_dflags & RTDF_GATELINK; 1249 ipv6nd_neighbour(ctx, &rt.rt_ss_dest.sin6.sin6_addr, reachable); 1250 } 1251 #endif 1252 1253 if (rtm->rtm_type != RTM_MISS && if_realroute(rtm)) 1254 rt_recvrt(rtm->rtm_type, &rt, rtm->rtm_pid); 1255 return 0; 1256 } 1257 1258 static int 1259 if_ifa(struct dhcpcd_ctx *ctx, const struct ifa_msghdr *ifam) 1260 { 1261 struct interface *ifp; 1262 const struct sockaddr *rti_info[RTAX_MAX]; 1263 int flags; 1264 pid_t pid; 1265 1266 if (ifam->ifam_msglen < sizeof(*ifam)) { 1267 errno = EINVAL; 1268 return -1; 1269 } 1270 1271 #ifdef HAVE_IFAM_PID 1272 /* Ignore address deletions from ourself. 1273 * We need to process address flag changes though. */ 1274 if (ifam->ifam_type == RTM_DELADDR) { 1275 #ifdef PRIVSEP 1276 if (ctx->ps_root_pid != 0) { 1277 if (ifam->ifam_pid == ctx->ps_root_pid) 1278 return 0; 1279 } else 1280 #endif 1281 /* address management is done via ioctl, 1282 * so SO_USELOOPBACK has no effect, 1283 * so we do need to check the pid. */ 1284 if (ifam->ifam_pid == getpid()) 1285 return 0; 1286 } 1287 pid = ifam->ifam_pid; 1288 #else 1289 pid = 0; 1290 #endif 1291 1292 if (~ifam->ifam_addrs & RTA_IFA) 1293 return 0; 1294 if ((ifp = if_findindex(ctx->ifaces, ifam->ifam_index)) == NULL) 1295 return 0; 1296 1297 if (get_addrs(ifam->ifam_addrs, (const char *)ifam + sizeof(*ifam), 1298 ifam->ifam_msglen - sizeof(*ifam), rti_info) == -1) 1299 return -1; 1300 1301 switch (rti_info[RTAX_IFA]->sa_family) { 1302 case AF_LINK: 1303 { 1304 struct sockaddr_dl sdl; 1305 1306 #ifdef RTM_CHGADDR 1307 if (ifam->ifam_type != RTM_CHGADDR) 1308 break; 1309 #else 1310 if (ifam->ifam_type != RTM_NEWADDR) 1311 break; 1312 #endif 1313 memcpy(&sdl, rti_info[RTAX_IFA], rti_info[RTAX_IFA]->sa_len); 1314 dhcpcd_handlehwaddr(ifp, ifp->hwtype, 1315 CLLADDR(&sdl), sdl.sdl_alen); 1316 break; 1317 } 1318 #ifdef INET 1319 case AF_INET: 1320 case 255: /* FIXME: Why 255? */ 1321 { 1322 const struct sockaddr_in *sin; 1323 struct in_addr addr, mask, bcast; 1324 1325 sin = (const void *)rti_info[RTAX_IFA]; 1326 addr.s_addr = sin != NULL && sin->sin_family == AF_INET ? 1327 sin->sin_addr.s_addr : INADDR_ANY; 1328 sin = (const void *)rti_info[RTAX_NETMASK]; 1329 mask.s_addr = sin != NULL && sin->sin_family == AF_INET ? 1330 sin->sin_addr.s_addr : INADDR_ANY; 1331 sin = (const void *)rti_info[RTAX_BRD]; 1332 bcast.s_addr = sin != NULL && sin->sin_family == AF_INET ? 1333 sin->sin_addr.s_addr : INADDR_ANY; 1334 1335 /* 1336 * NetBSD-7 and older send an invalid broadcast address. 1337 * So we need to query the actual address to get 1338 * the right one. 1339 * We can also use this to test if the address 1340 * has really been added or deleted. 1341 */ 1342 #ifdef SIOCGIFALIAS 1343 struct in_aliasreq ifra; 1344 1345 memset(&ifra, 0, sizeof(ifra)); 1346 strlcpy(ifra.ifra_name, ifp->name, sizeof(ifra.ifra_name)); 1347 ifra.ifra_addr.sin_family = AF_INET; 1348 ifra.ifra_addr.sin_len = sizeof(ifra.ifra_addr); 1349 ifra.ifra_addr.sin_addr = addr; 1350 if (ioctl(ctx->pf_inet_fd, SIOCGIFALIAS, &ifra) == -1) { 1351 if (errno != ENXIO && errno != EADDRNOTAVAIL) 1352 logerr("%s: SIOCGIFALIAS", __func__); 1353 if (ifam->ifam_type != RTM_DELADDR) 1354 break; 1355 } else { 1356 if (ifam->ifam_type == RTM_DELADDR) 1357 break; 1358 #if defined(__NetBSD_Version__) && __NetBSD_Version__ < 800000000 1359 bcast = ifra.ifra_broadaddr.sin_addr; 1360 #endif 1361 } 1362 #else 1363 #warning No SIOCGIFALIAS support 1364 /* 1365 * No SIOCGIFALIAS? That sucks! 1366 * This makes this call very heavy weight, but we 1367 * really need to know if the message is late or not. 1368 */ 1369 const struct sockaddr *sa; 1370 struct ifaddrs *ifaddrs = NULL, *ifa; 1371 1372 sa = rti_info[RTAX_IFA]; 1373 #ifdef PRIVSEP_GETIFADDRS 1374 if (IN_PRIVSEP(ctx)) { 1375 if (ps_root_getifaddrs(ctx, &ifaddrs) == -1) { 1376 logerr("ps_root_getifaddrs"); 1377 break; 1378 } 1379 } else 1380 #endif 1381 if (getifaddrs(&ifaddrs) == -1) { 1382 logerr("getifaddrs"); 1383 break; 1384 } 1385 for (ifa = ifaddrs; ifa; ifa = ifa->ifa_next) { 1386 if (ifa->ifa_addr == NULL) 1387 continue; 1388 if (sa_cmp(ifa->ifa_addr, sa) == 0 && 1389 strcmp(ifa->ifa_name, ifp->name) == 0) 1390 break; 1391 } 1392 #ifdef PRIVSEP_GETIFADDRS 1393 if (IN_PRIVSEP(ctx)) 1394 free(ifaddrs); 1395 else 1396 #endif 1397 freeifaddrs(ifaddrs); 1398 if (ifam->ifam_type == RTM_DELADDR) { 1399 if (ifa != NULL) 1400 break; 1401 } else { 1402 if (ifa == NULL) 1403 break; 1404 } 1405 #endif 1406 1407 #ifdef HAVE_IFAM_ADDRFLAGS 1408 flags = ifam->ifam_addrflags; 1409 #else 1410 flags = 0; 1411 #endif 1412 1413 ipv4_handleifa(ctx, ifam->ifam_type, NULL, ifp->name, 1414 &addr, &mask, &bcast, flags, pid); 1415 break; 1416 } 1417 #endif 1418 #ifdef INET6 1419 case AF_INET6: 1420 { 1421 struct in6_addr addr6, mask6; 1422 const struct sockaddr_in6 *sin6; 1423 1424 sin6 = (const void *)rti_info[RTAX_IFA]; 1425 addr6 = sin6->sin6_addr; 1426 sin6 = (const void *)rti_info[RTAX_NETMASK]; 1427 mask6 = sin6->sin6_addr; 1428 1429 /* 1430 * If the address was deleted, lets check if it's 1431 * a late message and it still exists (maybe modified). 1432 * If so, ignore it as deleting an address causes 1433 * dhcpcd to drop any lease to which it belongs. 1434 * Also check an added address was really added. 1435 */ 1436 flags = if_addrflags6(ifp, &addr6, NULL); 1437 if (flags == -1) { 1438 if (errno != ENXIO && errno != EADDRNOTAVAIL) 1439 logerr("%s: if_addrflags6", __func__); 1440 if (ifam->ifam_type != RTM_DELADDR) 1441 break; 1442 flags = 0; 1443 } else if (ifam->ifam_type == RTM_DELADDR) 1444 break; 1445 1446 #ifdef __KAME__ 1447 if (IN6_IS_ADDR_LINKLOCAL(&addr6)) 1448 /* Remove the scope from the address */ 1449 addr6.s6_addr[2] = addr6.s6_addr[3] = '\0'; 1450 #endif 1451 1452 ipv6_handleifa(ctx, ifam->ifam_type, NULL, 1453 ifp->name, &addr6, ipv6_prefixlen(&mask6), flags, pid); 1454 break; 1455 } 1456 #endif 1457 } 1458 1459 return 0; 1460 } 1461 1462 static int 1463 if_dispatch(struct dhcpcd_ctx *ctx, const struct rt_msghdr *rtm) 1464 { 1465 1466 if (rtm->rtm_version != RTM_VERSION) 1467 return 0; 1468 1469 switch(rtm->rtm_type) { 1470 #ifdef RTM_IFANNOUNCE 1471 case RTM_IFANNOUNCE: 1472 return if_announce(ctx, (const void *)rtm); 1473 #endif 1474 case RTM_IFINFO: 1475 return if_ifinfo(ctx, (const void *)rtm); 1476 case RTM_ADD: /* FALLTHROUGH */ 1477 case RTM_CHANGE: /* FALLTHROUGH */ 1478 case RTM_DELETE: /* FALLTHROUGH */ 1479 case RTM_MISS: 1480 return if_rtm(ctx, (const void *)rtm); 1481 #ifdef RTM_CHGADDR 1482 case RTM_CHGADDR: /* FALLTHROUGH */ 1483 #endif 1484 case RTM_DELADDR: /* FALLTHROUGH */ 1485 case RTM_NEWADDR: 1486 return if_ifa(ctx, (const void *)rtm); 1487 #ifdef RTM_DESYNC 1488 case RTM_DESYNC: 1489 dhcpcd_linkoverflow(ctx); 1490 #elif !defined(SO_RERROR) 1491 #warning cannot detect route socket overflow within kernel 1492 #endif 1493 } 1494 1495 return 0; 1496 } 1497 1498 static int 1499 if_missfilter0(struct dhcpcd_ctx *ctx, struct interface *ifp, 1500 struct sockaddr *sa) 1501 { 1502 size_t salen = (size_t)RT_ROUNDUP(sa->sa_len); 1503 size_t newlen = ctx->rt_missfilterlen + salen; 1504 size_t diff = salen - (sa->sa_len); 1505 uint8_t *cp; 1506 1507 if (ctx->rt_missfiltersize < newlen) { 1508 void *n = realloc(ctx->rt_missfilter, newlen); 1509 if (n == NULL) 1510 return -1; 1511 ctx->rt_missfilter = n; 1512 ctx->rt_missfiltersize = newlen; 1513 } 1514 1515 #ifdef INET6 1516 if (sa->sa_family == AF_INET6) 1517 ipv6_setscope(satosin6(sa), ifp->index); 1518 #else 1519 UNUSED(ifp); 1520 #endif 1521 1522 cp = ctx->rt_missfilter + ctx->rt_missfilterlen; 1523 memcpy(cp, sa, sa->sa_len); 1524 if (diff != 0) 1525 memset(cp + sa->sa_len, 0, diff); 1526 ctx->rt_missfilterlen += salen; 1527 1528 #ifdef INET6 1529 if (sa->sa_family == AF_INET6) 1530 ipv6_setscope(satosin6(sa), 0); 1531 #endif 1532 1533 return 0; 1534 } 1535 1536 int 1537 if_missfilter(struct interface *ifp, struct sockaddr *sa) 1538 { 1539 1540 return if_missfilter0(ifp->ctx, ifp, sa); 1541 } 1542 1543 int 1544 if_missfilter_apply(struct dhcpcd_ctx *ctx) 1545 { 1546 #ifdef RO_MISSFILTER 1547 if (ctx->rt_missfilterlen == 0) { 1548 struct sockaddr sa = { 1549 .sa_family = AF_UNSPEC, 1550 .sa_len = sizeof(sa), 1551 }; 1552 1553 if (if_missfilter0(ctx, NULL, &sa) == -1) 1554 return -1; 1555 } 1556 1557 return setsockopt(ctx->link_fd, PF_ROUTE, RO_MISSFILTER, 1558 ctx->rt_missfilter, (socklen_t)ctx->rt_missfilterlen); 1559 #else 1560 #warning kernel does not support RTM_MISS DST filtering 1561 UNUSED(ctx); 1562 errno = ENOTSUP; 1563 return -1; 1564 #endif 1565 } 1566 1567 __CTASSERT(offsetof(struct rt_msghdr, rtm_msglen) == 0); 1568 int 1569 if_handlelink(struct dhcpcd_ctx *ctx) 1570 { 1571 struct rtm rtm; 1572 ssize_t len; 1573 1574 len = read(ctx->link_fd, &rtm, sizeof(rtm)); 1575 if (len == -1) 1576 return -1; 1577 if (len == 0) 1578 return 0; 1579 if ((size_t)len < sizeof(rtm.hdr.rtm_msglen) || 1580 len != rtm.hdr.rtm_msglen) 1581 { 1582 errno = EINVAL; 1583 return -1; 1584 } 1585 /* 1586 * Coverity thinks that the data could be tainted from here. 1587 * I have no idea how because the length of the data we read 1588 * is guarded by len and checked to match rtm_msglen. 1589 * The issue seems to be related to extracting the addresses 1590 * at the end of the header, but seems to have no issues with the 1591 * equivalent call in if_initrt. 1592 */ 1593 /* coverity[tainted_data] */ 1594 return if_dispatch(ctx, &rtm.hdr); 1595 } 1596 1597 #ifndef SYS_NMLN /* OSX */ 1598 # define SYS_NMLN __SYS_NAMELEN 1599 #endif 1600 #ifndef HW_MACHINE_ARCH 1601 # ifdef HW_MODEL /* OpenBSD */ 1602 # define HW_MACHINE_ARCH HW_MODEL 1603 # endif 1604 #endif 1605 int 1606 if_machinearch(char *str, size_t len) 1607 { 1608 int mib[2] = { CTL_HW, HW_MACHINE_ARCH }; 1609 1610 return sysctl(mib, sizeof(mib) / sizeof(mib[0]), str, &len, NULL, 0); 1611 } 1612 1613 #ifdef INET6 1614 #if (defined(IPV6CTL_ACCEPT_RTADV) && !defined(ND6_IFF_ACCEPT_RTADV)) || \ 1615 defined(IPV6CTL_FORWARDING) 1616 #define get_inet6_sysctl(code) inet6_sysctl(code, 0, 0) 1617 #define set_inet6_sysctl(code, val) inet6_sysctl(code, val, 1) 1618 static int 1619 inet6_sysctl(int code, int val, int action) 1620 { 1621 int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 }; 1622 size_t size; 1623 1624 mib[3] = code; 1625 size = sizeof(val); 1626 if (action) { 1627 if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), 1628 NULL, 0, &val, size) == -1) 1629 return -1; 1630 return 0; 1631 } 1632 if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &val, &size, NULL, 0) == -1) 1633 return -1; 1634 return val; 1635 } 1636 #endif 1637 1638 int 1639 if_applyra(const struct ra *rap) 1640 { 1641 #ifdef SIOCSIFINFO_IN6 1642 struct in6_ndireq nd = { .ndi.chlim = 0 }; 1643 struct dhcpcd_ctx *ctx = rap->iface->ctx; 1644 int error; 1645 1646 strlcpy(nd.ifname, rap->iface->name, sizeof(nd.ifname)); 1647 1648 #ifdef IPV6CTL_ACCEPT_RTADV 1649 struct priv *priv = ctx->priv; 1650 1651 /* 1652 * NetBSD changed SIOCSIFINFO_IN6 to NOT set flags when kernel 1653 * RA was removed, however both FreeBSD and DragonFlyBSD still do. 1654 * linkmtu was also removed. 1655 * Hopefully this guard will still work if either remove kernel RA. 1656 */ 1657 if (ioctl(priv->pf_inet6_fd, SIOCGIFINFO_IN6, &nd, sizeof(nd)) == -1) 1658 return -1; 1659 1660 nd.ndi.linkmtu = rap->mtu; 1661 #endif 1662 1663 nd.ndi.chlim = rap->hoplimit; 1664 nd.ndi.retrans = rap->retrans; 1665 nd.ndi.basereachable = rap->reachable; 1666 error = if_ioctl6(ctx, SIOCSIFINFO_IN6, &nd, sizeof(nd)); 1667 #ifdef IPV6CTL_ACCEPT_RTADV 1668 if (error == -1 && errno == EINVAL) { 1669 /* 1670 * Very likely that this is caused by a dodgy MTU 1671 * setting specific to the interface. 1672 * Let's set it to "unspecified" and try again. 1673 * Doesn't really matter as we fix the MTU against the 1674 * routes we add as not all OS support SIOCSIFINFO_IN6. 1675 */ 1676 nd.ndi.linkmtu = 0; 1677 error = if_ioctl6(ctx, SIOCSIFINFO_IN6, &nd, sizeof(nd)); 1678 } 1679 #endif 1680 return error; 1681 #else 1682 #warning OS does not allow setting of RA bits hoplimit, retrans or reachable 1683 UNUSED(rap); 1684 return 0; 1685 #endif 1686 } 1687 1688 #ifndef IPV6CTL_FORWARDING 1689 #define get_inet6_sysctlbyname(code) inet6_sysctlbyname(code, 0, 0) 1690 #define set_inet6_sysctlbyname(code, val) inet6_sysctlbyname(code, val, 1) 1691 static int 1692 inet6_sysctlbyname(const char *name, int val, int action) 1693 { 1694 size_t size; 1695 1696 size = sizeof(val); 1697 if (action) { 1698 if (sysctlbyname(name, NULL, 0, &val, size) == -1) 1699 return -1; 1700 return 0; 1701 } 1702 if (sysctlbyname(name, &val, &size, NULL, 0) == -1) 1703 return -1; 1704 return val; 1705 } 1706 #endif 1707 1708 int 1709 ip6_forwarding(__unused const char *ifname) 1710 { 1711 int val; 1712 1713 #ifdef IPV6CTL_FORWARDING 1714 val = get_inet6_sysctl(IPV6CTL_FORWARDING); 1715 #else 1716 val = get_inet6_sysctlbyname("net.inet6.ip6.forwarding"); 1717 #endif 1718 return val < 0 ? 0 : val; 1719 } 1720 1721 #ifdef SIOCIFAFATTACH 1722 static int 1723 if_af_attach(const struct interface *ifp, int af) 1724 { 1725 struct if_afreq ifar; 1726 1727 strlcpy(ifar.ifar_name, ifp->name, sizeof(ifar.ifar_name)); 1728 ifar.ifar_af = af; 1729 return if_ioctl6(ifp->ctx, SIOCIFAFATTACH, &ifar, sizeof(ifar)); 1730 } 1731 #endif 1732 1733 #ifdef SIOCGIFXFLAGS 1734 static int 1735 if_set_ifxflags(const struct interface *ifp) 1736 { 1737 struct ifreq ifr; 1738 int flags; 1739 struct priv *priv = ifp->ctx->priv; 1740 1741 strlcpy(ifr.ifr_name, ifp->name, sizeof(ifr.ifr_name)); 1742 if (ioctl(priv->pf_inet6_fd, SIOCGIFXFLAGS, &ifr) == -1) 1743 return -1; 1744 flags = ifr.ifr_flags; 1745 #ifdef IFXF_NOINET6 1746 flags &= ~IFXF_NOINET6; 1747 #endif 1748 /* 1749 * If not doing autoconf, don't disable the kernel from doing it. 1750 * If we need to, we should have another option actively disable it. 1751 * 1752 * OpenBSD moved from kernel based SLAAC to userland via slaacd(8). 1753 * It has a similar featureset to dhcpcd such as stable private 1754 * addresses, but lacks the ability to handle DNS inside the RA 1755 * which is a serious shortfall in this day and age. 1756 * Appease their user base by working alongside slaacd(8) if 1757 * dhcpcd is instructed not to do auto configuration of addresses. 1758 */ 1759 #if defined(ND6_IFF_ACCEPT_RTADV) 1760 #define BSD_AUTOCONF DHCPCD_IPV6RS 1761 #else 1762 #define BSD_AUTOCONF DHCPCD_IPV6RA_AUTOCONF 1763 #endif 1764 if (ifp->options->options & BSD_AUTOCONF) 1765 flags &= ~IFXF_AUTOCONF6; 1766 if (ifr.ifr_flags == flags) 1767 return 0; 1768 ifr.ifr_flags = flags; 1769 return if_ioctl6(ifp->ctx, SIOCSIFXFLAGS, &ifr, sizeof(ifr)); 1770 } 1771 #endif 1772 1773 /* OpenBSD removed ND6 flags entirely, so we need to check for their 1774 * existance. */ 1775 #if defined(ND6_IFF_AUTO_LINKLOCAL) || \ 1776 defined(ND6_IFF_PERFORMNUD) || \ 1777 defined(ND6_IFF_ACCEPT_RTADV) || \ 1778 defined(ND6_IFF_OVERRIDE_RTADV) || \ 1779 defined(ND6_IFF_IFDISABLED) 1780 #define ND6_NDI_FLAGS 1781 #endif 1782 1783 void 1784 if_disable_rtadv(void) 1785 { 1786 #if defined(IPV6CTL_ACCEPT_RTADV) && !defined(ND6_IFF_ACCEPT_RTADV) 1787 int ra = get_inet6_sysctl(IPV6CTL_ACCEPT_RTADV); 1788 1789 if (ra == -1) { 1790 if (errno != ENOENT) 1791 logerr("IPV6CTL_ACCEPT_RTADV"); 1792 else if (ra != 0) 1793 if (set_inet6_sysctl(IPV6CTL_ACCEPT_RTADV, 0) == -1) 1794 logerr("IPV6CTL_ACCEPT_RTADV"); 1795 } 1796 #endif 1797 } 1798 1799 void 1800 if_setup_inet6(const struct interface *ifp) 1801 { 1802 struct priv *priv; 1803 int s; 1804 #ifdef ND6_NDI_FLAGS 1805 struct in6_ndireq nd; 1806 int flags; 1807 #endif 1808 1809 priv = (struct priv *)ifp->ctx->priv; 1810 s = priv->pf_inet6_fd; 1811 1812 #ifdef ND6_NDI_FLAGS 1813 memset(&nd, 0, sizeof(nd)); 1814 strlcpy(nd.ifname, ifp->name, sizeof(nd.ifname)); 1815 if (ioctl(s, SIOCGIFINFO_IN6, &nd) == -1) 1816 logerr("%s: SIOCGIFINFO_FLAGS", ifp->name); 1817 flags = (int)nd.ndi.flags; 1818 #endif 1819 1820 #ifdef ND6_IFF_AUTO_LINKLOCAL 1821 /* Unlike the kernel, dhcpcd make make a stable private address. */ 1822 flags &= ~ND6_IFF_AUTO_LINKLOCAL; 1823 #endif 1824 1825 #ifdef ND6_IFF_PERFORMNUD 1826 /* NUD is kind of essential. */ 1827 flags |= ND6_IFF_PERFORMNUD; 1828 #endif 1829 1830 #ifdef ND6_IFF_IFDISABLED 1831 /* Ensure the interface is not disabled. */ 1832 flags &= ~ND6_IFF_IFDISABLED; 1833 #endif 1834 1835 /* 1836 * If not doing autoconf, don't disable the kernel from doing it. 1837 * If we need to, we should have another option actively disable it. 1838 */ 1839 #ifdef ND6_IFF_ACCEPT_RTADV 1840 if (ifp->options->options & DHCPCD_IPV6RS) 1841 flags &= ~ND6_IFF_ACCEPT_RTADV; 1842 #ifdef ND6_IFF_OVERRIDE_RTADV 1843 if (ifp->options->options & DHCPCD_IPV6RS) 1844 flags |= ND6_IFF_OVERRIDE_RTADV; 1845 #endif 1846 #endif 1847 1848 #ifdef ND6_NDI_FLAGS 1849 if (nd.ndi.flags != (uint32_t)flags) { 1850 nd.ndi.flags = (uint32_t)flags; 1851 if (if_ioctl6(ifp->ctx, SIOCSIFINFO_FLAGS, 1852 &nd, sizeof(nd)) == -1) 1853 logerr("%s: SIOCSIFINFO_FLAGS", ifp->name); 1854 } 1855 #endif 1856 1857 /* Enabling IPv6 by whatever means must be the 1858 * last action undertaken to ensure kernel RS and 1859 * LLADDR auto configuration are disabled where applicable. */ 1860 #ifdef SIOCIFAFATTACH 1861 if (if_af_attach(ifp, AF_INET6) == -1) 1862 logerr("%s: if_af_attach", ifp->name); 1863 #endif 1864 1865 #ifdef SIOCGIFXFLAGS 1866 if (if_set_ifxflags(ifp) == -1) 1867 logerr("%s: set_ifxflags", ifp->name); 1868 #endif 1869 1870 #ifdef SIOCSRTRFLUSH_IN6 1871 /* Flush the kernel knowledge of advertised routers 1872 * and prefixes so the kernel does not expire prefixes 1873 * and default routes we are trying to own. */ 1874 if (ifp->options->options & DHCPCD_IPV6RS) { 1875 struct in6_ifreq ifr; 1876 1877 memset(&ifr, 0, sizeof(ifr)); 1878 strlcpy(ifr.ifr_name, ifp->name, sizeof(ifr.ifr_name)); 1879 if (if_ioctl6(ifp->ctx, SIOCSRTRFLUSH_IN6, 1880 &ifr, sizeof(ifr)) == -1 && 1881 errno != ENOTSUP && errno != ENOTTY) 1882 logwarn("SIOCSRTRFLUSH_IN6 %d", errno); 1883 #ifdef SIOCSPFXFLUSH_IN6 1884 if (if_ioctl6(ifp->ctx, SIOCSPFXFLUSH_IN6, 1885 &ifr, sizeof(ifr)) == -1 && 1886 errno != ENOTSUP && errno != ENOTTY) 1887 logwarn("SIOCSPFXFLUSH_IN6"); 1888 #endif 1889 } 1890 #endif 1891 } 1892 #endif 1893