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