1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * Copyright (C) 2001 WIDE Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)in.c 8.4 (Berkeley) 1/9/95 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include "opt_mpath.h" 39 40 #include <sys/param.h> 41 #include <sys/eventhandler.h> 42 #include <sys/systm.h> 43 #include <sys/sockio.h> 44 #include <sys/malloc.h> 45 #include <sys/priv.h> 46 #include <sys/socket.h> 47 #include <sys/jail.h> 48 #include <sys/kernel.h> 49 #include <sys/lock.h> 50 #include <sys/proc.h> 51 #include <sys/rmlock.h> 52 #include <sys/sysctl.h> 53 #include <sys/syslog.h> 54 #include <sys/sx.h> 55 56 #include <net/if.h> 57 #include <net/if_var.h> 58 #include <net/if_arp.h> 59 #include <net/if_dl.h> 60 #include <net/if_llatbl.h> 61 #include <net/if_types.h> 62 #include <net/route.h> 63 #include <net/vnet.h> 64 65 #include <netinet/if_ether.h> 66 #include <netinet/in.h> 67 #include <netinet/in_var.h> 68 #include <netinet/in_pcb.h> 69 #include <netinet/ip_var.h> 70 #include <netinet/ip_carp.h> 71 #include <netinet/igmp_var.h> 72 #include <netinet/udp.h> 73 #include <netinet/udp_var.h> 74 75 static int in_aifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *); 76 static int in_difaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *); 77 78 static void in_socktrim(struct sockaddr_in *); 79 static void in_purgemaddrs(struct ifnet *); 80 81 VNET_DEFINE_STATIC(int, nosameprefix); 82 #define V_nosameprefix VNET(nosameprefix) 83 SYSCTL_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_VNET | CTLFLAG_RW, 84 &VNET_NAME(nosameprefix), 0, 85 "Refuse to create same prefixes on different interfaces"); 86 87 VNET_DECLARE(struct inpcbinfo, ripcbinfo); 88 #define V_ripcbinfo VNET(ripcbinfo) 89 90 static struct sx in_control_sx; 91 SX_SYSINIT(in_control_sx, &in_control_sx, "in_control"); 92 93 /* 94 * Return 1 if an internet address is for a ``local'' host 95 * (one to which we have a connection). 96 */ 97 int 98 in_localaddr(struct in_addr in) 99 { 100 struct rm_priotracker in_ifa_tracker; 101 u_long i = ntohl(in.s_addr); 102 struct in_ifaddr *ia; 103 104 IN_IFADDR_RLOCK(&in_ifa_tracker); 105 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 106 if ((i & ia->ia_subnetmask) == ia->ia_subnet) { 107 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 108 return (1); 109 } 110 } 111 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 112 return (0); 113 } 114 115 /* 116 * Return 1 if an internet address is for the local host and configured 117 * on one of its interfaces. 118 */ 119 int 120 in_localip(struct in_addr in) 121 { 122 struct rm_priotracker in_ifa_tracker; 123 struct in_ifaddr *ia; 124 125 IN_IFADDR_RLOCK(&in_ifa_tracker); 126 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { 127 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) { 128 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 129 return (1); 130 } 131 } 132 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 133 return (0); 134 } 135 136 /* 137 * Return 1 if an internet address is configured on an interface. 138 */ 139 int 140 in_ifhasaddr(struct ifnet *ifp, struct in_addr in) 141 { 142 struct epoch_tracker et; 143 struct ifaddr *ifa; 144 struct in_ifaddr *ia; 145 146 NET_EPOCH_ENTER(et); 147 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 148 if (ifa->ifa_addr->sa_family != AF_INET) 149 continue; 150 ia = (struct in_ifaddr *)ifa; 151 if (ia->ia_addr.sin_addr.s_addr == in.s_addr) { 152 NET_EPOCH_EXIT(et); 153 return (1); 154 } 155 } 156 NET_EPOCH_EXIT(et); 157 158 return (0); 159 } 160 161 /* 162 * Return a reference to the interface address which is different to 163 * the supplied one but with same IP address value. 164 */ 165 static struct in_ifaddr * 166 in_localip_more(struct in_ifaddr *ia) 167 { 168 struct rm_priotracker in_ifa_tracker; 169 in_addr_t in = IA_SIN(ia)->sin_addr.s_addr; 170 struct in_ifaddr *it; 171 172 IN_IFADDR_RLOCK(&in_ifa_tracker); 173 LIST_FOREACH(it, INADDR_HASH(in), ia_hash) { 174 if (it != ia && IA_SIN(it)->sin_addr.s_addr == in) { 175 ifa_ref(&it->ia_ifa); 176 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 177 return (it); 178 } 179 } 180 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 181 182 return (NULL); 183 } 184 185 /* 186 * Determine whether an IP address is in a reserved set of addresses 187 * that may not be forwarded, or whether datagrams to that destination 188 * may be forwarded. 189 */ 190 int 191 in_canforward(struct in_addr in) 192 { 193 u_long i = ntohl(in.s_addr); 194 195 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i) || 196 IN_ZERONET(i) || IN_LOOPBACK(i)) 197 return (0); 198 return (1); 199 } 200 201 /* 202 * Trim a mask in a sockaddr 203 */ 204 static void 205 in_socktrim(struct sockaddr_in *ap) 206 { 207 char *cplim = (char *) &ap->sin_addr; 208 char *cp = (char *) (&ap->sin_addr + 1); 209 210 ap->sin_len = 0; 211 while (--cp >= cplim) 212 if (*cp) { 213 (ap)->sin_len = cp - (char *) (ap) + 1; 214 break; 215 } 216 } 217 218 /* 219 * Generic internet control operations (ioctl's). 220 */ 221 int 222 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 223 struct thread *td) 224 { 225 struct ifreq *ifr = (struct ifreq *)data; 226 struct sockaddr_in *addr = (struct sockaddr_in *)&ifr->ifr_addr; 227 struct epoch_tracker et; 228 struct ifaddr *ifa; 229 struct in_ifaddr *ia; 230 int error; 231 232 if (ifp == NULL) 233 return (EADDRNOTAVAIL); 234 235 /* 236 * Filter out 4 ioctls we implement directly. Forward the rest 237 * to specific functions and ifp->if_ioctl(). 238 */ 239 switch (cmd) { 240 case SIOCGIFADDR: 241 case SIOCGIFBRDADDR: 242 case SIOCGIFDSTADDR: 243 case SIOCGIFNETMASK: 244 break; 245 case SIOCDIFADDR: 246 sx_xlock(&in_control_sx); 247 error = in_difaddr_ioctl(cmd, data, ifp, td); 248 sx_xunlock(&in_control_sx); 249 return (error); 250 case OSIOCAIFADDR: /* 9.x compat */ 251 case SIOCAIFADDR: 252 sx_xlock(&in_control_sx); 253 error = in_aifaddr_ioctl(cmd, data, ifp, td); 254 sx_xunlock(&in_control_sx); 255 return (error); 256 case SIOCSIFADDR: 257 case SIOCSIFBRDADDR: 258 case SIOCSIFDSTADDR: 259 case SIOCSIFNETMASK: 260 /* We no longer support that old commands. */ 261 return (EINVAL); 262 default: 263 if (ifp->if_ioctl == NULL) 264 return (EOPNOTSUPP); 265 return ((*ifp->if_ioctl)(ifp, cmd, data)); 266 } 267 268 if (addr->sin_addr.s_addr != INADDR_ANY && 269 prison_check_ip4(td->td_ucred, &addr->sin_addr) != 0) 270 return (EADDRNOTAVAIL); 271 272 /* 273 * Find address for this interface, if it exists. If an 274 * address was specified, find that one instead of the 275 * first one on the interface, if possible. 276 */ 277 NET_EPOCH_ENTER(et); 278 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 279 if (ifa->ifa_addr->sa_family != AF_INET) 280 continue; 281 ia = (struct in_ifaddr *)ifa; 282 if (ia->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr) 283 break; 284 } 285 if (ifa == NULL) 286 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 287 if (ifa->ifa_addr->sa_family == AF_INET) { 288 ia = (struct in_ifaddr *)ifa; 289 if (prison_check_ip4(td->td_ucred, 290 &ia->ia_addr.sin_addr) == 0) 291 break; 292 } 293 294 if (ifa == NULL) { 295 NET_EPOCH_EXIT(et); 296 return (EADDRNOTAVAIL); 297 } 298 299 error = 0; 300 switch (cmd) { 301 case SIOCGIFADDR: 302 *addr = ia->ia_addr; 303 break; 304 305 case SIOCGIFBRDADDR: 306 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 307 error = EINVAL; 308 break; 309 } 310 *addr = ia->ia_broadaddr; 311 break; 312 313 case SIOCGIFDSTADDR: 314 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 315 error = EINVAL; 316 break; 317 } 318 *addr = ia->ia_dstaddr; 319 break; 320 321 case SIOCGIFNETMASK: 322 *addr = ia->ia_sockmask; 323 break; 324 } 325 326 NET_EPOCH_EXIT(et); 327 328 return (error); 329 } 330 331 static int 332 in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td) 333 { 334 const struct in_aliasreq *ifra = (struct in_aliasreq *)data; 335 const struct sockaddr_in *addr = &ifra->ifra_addr; 336 const struct sockaddr_in *broadaddr = &ifra->ifra_broadaddr; 337 const struct sockaddr_in *mask = &ifra->ifra_mask; 338 const struct sockaddr_in *dstaddr = &ifra->ifra_dstaddr; 339 const int vhid = (cmd == SIOCAIFADDR) ? ifra->ifra_vhid : 0; 340 struct epoch_tracker et; 341 struct ifaddr *ifa; 342 struct in_ifaddr *ia; 343 bool iaIsFirst; 344 int error = 0; 345 346 error = priv_check(td, PRIV_NET_ADDIFADDR); 347 if (error) 348 return (error); 349 350 /* 351 * ifra_addr must be present and be of INET family. 352 * ifra_broadaddr/ifra_dstaddr and ifra_mask are optional. 353 */ 354 if (addr->sin_len != sizeof(struct sockaddr_in) || 355 addr->sin_family != AF_INET) 356 return (EINVAL); 357 if (broadaddr->sin_len != 0 && 358 (broadaddr->sin_len != sizeof(struct sockaddr_in) || 359 broadaddr->sin_family != AF_INET)) 360 return (EINVAL); 361 if (mask->sin_len != 0 && 362 (mask->sin_len != sizeof(struct sockaddr_in) || 363 mask->sin_family != AF_INET)) 364 return (EINVAL); 365 if ((ifp->if_flags & IFF_POINTOPOINT) && 366 (dstaddr->sin_len != sizeof(struct sockaddr_in) || 367 dstaddr->sin_addr.s_addr == INADDR_ANY)) 368 return (EDESTADDRREQ); 369 if (vhid > 0 && carp_attach_p == NULL) 370 return (EPROTONOSUPPORT); 371 372 /* 373 * See whether address already exist. 374 */ 375 iaIsFirst = true; 376 ia = NULL; 377 NET_EPOCH_ENTER(et); 378 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 379 struct in_ifaddr *it; 380 381 if (ifa->ifa_addr->sa_family != AF_INET) 382 continue; 383 384 it = (struct in_ifaddr *)ifa; 385 iaIsFirst = false; 386 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr && 387 prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0) 388 ia = it; 389 } 390 NET_EPOCH_EXIT(et); 391 392 if (ia != NULL) 393 (void )in_difaddr_ioctl(cmd, data, ifp, td); 394 395 ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK); 396 ia = (struct in_ifaddr *)ifa; 397 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 398 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 399 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 400 callout_init_rw(&ia->ia_garp_timer, &ifp->if_addr_lock, 401 CALLOUT_RETURNUNLOCKED); 402 403 ia->ia_ifp = ifp; 404 ia->ia_addr = *addr; 405 if (mask->sin_len != 0) { 406 ia->ia_sockmask = *mask; 407 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 408 } else { 409 in_addr_t i = ntohl(addr->sin_addr.s_addr); 410 411 /* 412 * Be compatible with network classes, if netmask isn't 413 * supplied, guess it based on classes. 414 */ 415 if (IN_CLASSA(i)) 416 ia->ia_subnetmask = IN_CLASSA_NET; 417 else if (IN_CLASSB(i)) 418 ia->ia_subnetmask = IN_CLASSB_NET; 419 else 420 ia->ia_subnetmask = IN_CLASSC_NET; 421 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 422 } 423 ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask; 424 in_socktrim(&ia->ia_sockmask); 425 426 if (ifp->if_flags & IFF_BROADCAST) { 427 if (broadaddr->sin_len != 0) { 428 ia->ia_broadaddr = *broadaddr; 429 } else if (ia->ia_subnetmask == IN_RFC3021_MASK) { 430 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST; 431 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in); 432 ia->ia_broadaddr.sin_family = AF_INET; 433 } else { 434 ia->ia_broadaddr.sin_addr.s_addr = 435 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 436 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in); 437 ia->ia_broadaddr.sin_family = AF_INET; 438 } 439 } 440 441 if (ifp->if_flags & IFF_POINTOPOINT) 442 ia->ia_dstaddr = *dstaddr; 443 444 /* XXXGL: rtinit() needs this strange assignment. */ 445 if (ifp->if_flags & IFF_LOOPBACK) 446 ia->ia_dstaddr = ia->ia_addr; 447 448 if (vhid != 0) { 449 error = (*carp_attach_p)(&ia->ia_ifa, vhid); 450 if (error) 451 return (error); 452 } 453 454 /* if_addrhead is already referenced by ifa_alloc() */ 455 IF_ADDR_WLOCK(ifp); 456 CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 457 IF_ADDR_WUNLOCK(ifp); 458 459 ifa_ref(ifa); /* in_ifaddrhead */ 460 IN_IFADDR_WLOCK(); 461 CK_STAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link); 462 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 463 IN_IFADDR_WUNLOCK(); 464 465 /* 466 * Give the interface a chance to initialize 467 * if this is its first address, 468 * and to validate the address if necessary. 469 */ 470 if (ifp->if_ioctl != NULL) { 471 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 472 if (error) 473 goto fail1; 474 } 475 476 /* 477 * Add route for the network. 478 */ 479 if (vhid == 0) { 480 int flags = RTF_UP; 481 482 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) 483 flags |= RTF_HOST; 484 485 error = in_addprefix(ia, flags); 486 if (error) 487 goto fail1; 488 } 489 490 /* 491 * Add a loopback route to self. 492 */ 493 if (vhid == 0 && (ifp->if_flags & IFF_LOOPBACK) == 0 && 494 ia->ia_addr.sin_addr.s_addr != INADDR_ANY && 495 !((ifp->if_flags & IFF_POINTOPOINT) && 496 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)) { 497 struct in_ifaddr *eia; 498 499 eia = in_localip_more(ia); 500 501 if (eia == NULL) { 502 error = ifa_add_loopback_route((struct ifaddr *)ia, 503 (struct sockaddr *)&ia->ia_addr); 504 if (error) 505 goto fail2; 506 } else 507 ifa_free(&eia->ia_ifa); 508 } 509 510 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST)) { 511 struct in_addr allhosts_addr; 512 struct in_ifinfo *ii; 513 514 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 515 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 516 517 error = in_joingroup(ifp, &allhosts_addr, NULL, 518 &ii->ii_allhosts); 519 } 520 521 /* 522 * Note: we don't need extra reference for ifa, since we called 523 * with sx lock held, and ifaddr can not be deleted in concurrent 524 * thread. 525 */ 526 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, ifa, IFADDR_EVENT_ADD); 527 528 return (error); 529 530 fail2: 531 if (vhid == 0) 532 (void )in_scrubprefix(ia, LLE_STATIC); 533 534 fail1: 535 if (ia->ia_ifa.ifa_carp) 536 (*carp_detach_p)(&ia->ia_ifa, false); 537 538 IF_ADDR_WLOCK(ifp); 539 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link); 540 IF_ADDR_WUNLOCK(ifp); 541 ifa_free(&ia->ia_ifa); /* if_addrhead */ 542 543 IN_IFADDR_WLOCK(); 544 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link); 545 LIST_REMOVE(ia, ia_hash); 546 IN_IFADDR_WUNLOCK(); 547 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 548 549 return (error); 550 } 551 552 static int 553 in_difaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td) 554 { 555 const struct ifreq *ifr = (struct ifreq *)data; 556 const struct sockaddr_in *addr = (const struct sockaddr_in *) 557 &ifr->ifr_addr; 558 struct ifaddr *ifa; 559 struct in_ifaddr *ia; 560 bool deleteAny, iaIsLast; 561 int error; 562 563 if (td != NULL) { 564 error = priv_check(td, PRIV_NET_DELIFADDR); 565 if (error) 566 return (error); 567 } 568 569 if (addr->sin_len != sizeof(struct sockaddr_in) || 570 addr->sin_family != AF_INET) 571 deleteAny = true; 572 else 573 deleteAny = false; 574 575 iaIsLast = true; 576 ia = NULL; 577 IF_ADDR_WLOCK(ifp); 578 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 579 struct in_ifaddr *it; 580 581 if (ifa->ifa_addr->sa_family != AF_INET) 582 continue; 583 584 it = (struct in_ifaddr *)ifa; 585 if (deleteAny && ia == NULL && (td == NULL || 586 prison_check_ip4(td->td_ucred, &it->ia_addr.sin_addr) == 0)) 587 ia = it; 588 589 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr && 590 (td == NULL || prison_check_ip4(td->td_ucred, 591 &addr->sin_addr) == 0)) 592 ia = it; 593 594 if (it != ia) 595 iaIsLast = false; 596 } 597 598 if (ia == NULL) { 599 IF_ADDR_WUNLOCK(ifp); 600 return (EADDRNOTAVAIL); 601 } 602 603 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link); 604 IF_ADDR_WUNLOCK(ifp); 605 ifa_free(&ia->ia_ifa); /* if_addrhead */ 606 607 IN_IFADDR_WLOCK(); 608 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link); 609 LIST_REMOVE(ia, ia_hash); 610 IN_IFADDR_WUNLOCK(); 611 612 /* 613 * in_scrubprefix() kills the interface route. 614 */ 615 in_scrubprefix(ia, LLE_STATIC); 616 617 /* 618 * in_ifadown gets rid of all the rest of 619 * the routes. This is not quite the right 620 * thing to do, but at least if we are running 621 * a routing process they will come back. 622 */ 623 in_ifadown(&ia->ia_ifa, 1); 624 625 if (ia->ia_ifa.ifa_carp) 626 (*carp_detach_p)(&ia->ia_ifa, cmd == SIOCAIFADDR); 627 628 /* 629 * If this is the last IPv4 address configured on this 630 * interface, leave the all-hosts group. 631 * No state-change report need be transmitted. 632 */ 633 if (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) { 634 struct in_ifinfo *ii; 635 636 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 637 if (ii->ii_allhosts) { 638 (void)in_leavegroup(ii->ii_allhosts, NULL); 639 ii->ii_allhosts = NULL; 640 } 641 } 642 643 IF_ADDR_WLOCK(ifp); 644 if (callout_stop(&ia->ia_garp_timer) == 1) { 645 ifa_free(&ia->ia_ifa); 646 } 647 IF_ADDR_WUNLOCK(ifp); 648 649 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa, 650 IFADDR_EVENT_DEL); 651 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 652 653 return (0); 654 } 655 656 #define rtinitflags(x) \ 657 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 658 ? RTF_HOST : 0) 659 660 /* 661 * Check if we have a route for the given prefix already or add one accordingly. 662 */ 663 int 664 in_addprefix(struct in_ifaddr *target, int flags) 665 { 666 struct rm_priotracker in_ifa_tracker; 667 struct in_ifaddr *ia; 668 struct in_addr prefix, mask, p, m; 669 int error; 670 671 if ((flags & RTF_HOST) != 0) { 672 prefix = target->ia_dstaddr.sin_addr; 673 mask.s_addr = 0; 674 } else { 675 prefix = target->ia_addr.sin_addr; 676 mask = target->ia_sockmask.sin_addr; 677 prefix.s_addr &= mask.s_addr; 678 } 679 680 IN_IFADDR_RLOCK(&in_ifa_tracker); 681 /* Look for an existing address with the same prefix, mask, and fib */ 682 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 683 if (rtinitflags(ia)) { 684 p = ia->ia_dstaddr.sin_addr; 685 686 if (prefix.s_addr != p.s_addr) 687 continue; 688 } else { 689 p = ia->ia_addr.sin_addr; 690 m = ia->ia_sockmask.sin_addr; 691 p.s_addr &= m.s_addr; 692 693 if (prefix.s_addr != p.s_addr || 694 mask.s_addr != m.s_addr) 695 continue; 696 } 697 if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib) 698 continue; 699 700 /* 701 * If we got a matching prefix route inserted by other 702 * interface address, we are done here. 703 */ 704 if (ia->ia_flags & IFA_ROUTE) { 705 #ifdef RADIX_MPATH 706 if (ia->ia_addr.sin_addr.s_addr == 707 target->ia_addr.sin_addr.s_addr) { 708 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 709 return (EEXIST); 710 } else 711 break; 712 #endif 713 if (V_nosameprefix) { 714 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 715 return (EEXIST); 716 } else { 717 int fibnum; 718 719 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS : 720 target->ia_ifp->if_fib; 721 rt_addrmsg(RTM_ADD, &target->ia_ifa, fibnum); 722 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 723 return (0); 724 } 725 } 726 } 727 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 728 729 /* 730 * No-one seem to have this prefix route, so we try to insert it. 731 */ 732 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 733 if (!error) 734 target->ia_flags |= IFA_ROUTE; 735 return (error); 736 } 737 738 /* 739 * Removes either all lle entries for given @ia, or lle 740 * corresponding to @ia address. 741 */ 742 static void 743 in_scrubprefixlle(struct in_ifaddr *ia, int all, u_int flags) 744 { 745 struct sockaddr_in addr, mask; 746 struct sockaddr *saddr, *smask; 747 struct ifnet *ifp; 748 749 saddr = (struct sockaddr *)&addr; 750 bzero(&addr, sizeof(addr)); 751 addr.sin_len = sizeof(addr); 752 addr.sin_family = AF_INET; 753 smask = (struct sockaddr *)&mask; 754 bzero(&mask, sizeof(mask)); 755 mask.sin_len = sizeof(mask); 756 mask.sin_family = AF_INET; 757 mask.sin_addr.s_addr = ia->ia_subnetmask; 758 ifp = ia->ia_ifp; 759 760 if (all) { 761 762 /* 763 * Remove all L2 entries matching given prefix. 764 * Convert address to host representation to avoid 765 * doing this on every callback. ia_subnetmask is already 766 * stored in host representation. 767 */ 768 addr.sin_addr.s_addr = ntohl(ia->ia_addr.sin_addr.s_addr); 769 lltable_prefix_free(AF_INET, saddr, smask, flags); 770 } else { 771 /* Remove interface address only */ 772 addr.sin_addr.s_addr = ia->ia_addr.sin_addr.s_addr; 773 lltable_delete_addr(LLTABLE(ifp), LLE_IFADDR, saddr); 774 } 775 } 776 777 /* 778 * If there is no other address in the system that can serve a route to the 779 * same prefix, remove the route. Hand over the route to the new address 780 * otherwise. 781 */ 782 int 783 in_scrubprefix(struct in_ifaddr *target, u_int flags) 784 { 785 struct rm_priotracker in_ifa_tracker; 786 struct in_ifaddr *ia; 787 struct in_addr prefix, mask, p, m; 788 int error = 0; 789 790 /* 791 * Remove the loopback route to the interface address. 792 */ 793 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) && 794 !(target->ia_ifp->if_flags & IFF_LOOPBACK) && 795 (flags & LLE_STATIC)) { 796 struct in_ifaddr *eia; 797 798 /* 799 * XXXME: add fib-aware in_localip. 800 * We definitely don't want to switch between 801 * prefixes in different fibs. 802 */ 803 eia = in_localip_more(target); 804 805 if (eia != NULL) { 806 error = ifa_switch_loopback_route((struct ifaddr *)eia, 807 (struct sockaddr *)&target->ia_addr); 808 ifa_free(&eia->ia_ifa); 809 } else { 810 error = ifa_del_loopback_route((struct ifaddr *)target, 811 (struct sockaddr *)&target->ia_addr); 812 } 813 } 814 815 if (rtinitflags(target)) { 816 prefix = target->ia_dstaddr.sin_addr; 817 mask.s_addr = 0; 818 } else { 819 prefix = target->ia_addr.sin_addr; 820 mask = target->ia_sockmask.sin_addr; 821 prefix.s_addr &= mask.s_addr; 822 } 823 824 if ((target->ia_flags & IFA_ROUTE) == 0) { 825 int fibnum; 826 827 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS : 828 target->ia_ifp->if_fib; 829 rt_addrmsg(RTM_DELETE, &target->ia_ifa, fibnum); 830 831 /* 832 * Removing address from !IFF_UP interface or 833 * prefix which exists on other interface (along with route). 834 * No entries should exist here except target addr. 835 * Given that, delete this entry only. 836 */ 837 in_scrubprefixlle(target, 0, flags); 838 return (0); 839 } 840 841 IN_IFADDR_RLOCK(&in_ifa_tracker); 842 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 843 if (rtinitflags(ia)) { 844 p = ia->ia_dstaddr.sin_addr; 845 846 if (prefix.s_addr != p.s_addr) 847 continue; 848 } else { 849 p = ia->ia_addr.sin_addr; 850 m = ia->ia_sockmask.sin_addr; 851 p.s_addr &= m.s_addr; 852 853 if (prefix.s_addr != p.s_addr || 854 mask.s_addr != m.s_addr) 855 continue; 856 } 857 858 if ((ia->ia_ifp->if_flags & IFF_UP) == 0) 859 continue; 860 861 /* 862 * If we got a matching prefix address, move IFA_ROUTE and 863 * the route itself to it. Make sure that routing daemons 864 * get a heads-up. 865 */ 866 if ((ia->ia_flags & IFA_ROUTE) == 0) { 867 ifa_ref(&ia->ia_ifa); 868 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 869 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, 870 rtinitflags(target)); 871 if (error == 0) 872 target->ia_flags &= ~IFA_ROUTE; 873 else 874 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n", 875 error); 876 /* Scrub all entries IFF interface is different */ 877 in_scrubprefixlle(target, target->ia_ifp != ia->ia_ifp, 878 flags); 879 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 880 rtinitflags(ia) | RTF_UP); 881 if (error == 0) 882 ia->ia_flags |= IFA_ROUTE; 883 else 884 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n", 885 error); 886 ifa_free(&ia->ia_ifa); 887 return (error); 888 } 889 } 890 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 891 892 /* 893 * remove all L2 entries on the given prefix 894 */ 895 in_scrubprefixlle(target, 1, flags); 896 897 /* 898 * As no-one seem to have this prefix, we can remove the route. 899 */ 900 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 901 if (error == 0) 902 target->ia_flags &= ~IFA_ROUTE; 903 else 904 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error); 905 return (error); 906 } 907 908 #undef rtinitflags 909 910 void 911 in_ifscrub_all(void) 912 { 913 struct ifnet *ifp; 914 struct ifaddr *ifa, *nifa; 915 struct ifaliasreq ifr; 916 917 IFNET_RLOCK(); 918 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 919 /* Cannot lock here - lock recursion. */ 920 /* NET_EPOCH_ENTER(et); */ 921 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) { 922 if (ifa->ifa_addr->sa_family != AF_INET) 923 continue; 924 925 /* 926 * This is ugly but the only way for legacy IP to 927 * cleanly remove addresses and everything attached. 928 */ 929 bzero(&ifr, sizeof(ifr)); 930 ifr.ifra_addr = *ifa->ifa_addr; 931 if (ifa->ifa_dstaddr) 932 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 933 (void)in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, 934 ifp, NULL); 935 } 936 /* NET_EPOCH_EXIT(et); */ 937 in_purgemaddrs(ifp); 938 igmp_domifdetach(ifp); 939 } 940 IFNET_RUNLOCK(); 941 } 942 943 int 944 in_ifaddr_broadcast(struct in_addr in, struct in_ifaddr *ia) 945 { 946 947 return ((in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 948 /* 949 * Check for old-style (host 0) broadcast, but 950 * taking into account that RFC 3021 obsoletes it. 951 */ 952 (ia->ia_subnetmask != IN_RFC3021_MASK && 953 ntohl(in.s_addr) == ia->ia_subnet)) && 954 /* 955 * Check for an all one subnetmask. These 956 * only exist when an interface gets a secondary 957 * address. 958 */ 959 ia->ia_subnetmask != (u_long)0xffffffff); 960 } 961 962 /* 963 * Return 1 if the address might be a local broadcast address. 964 */ 965 int 966 in_broadcast(struct in_addr in, struct ifnet *ifp) 967 { 968 struct epoch_tracker et; 969 struct ifaddr *ifa; 970 int found; 971 972 if (in.s_addr == INADDR_BROADCAST || 973 in.s_addr == INADDR_ANY) 974 return (1); 975 if ((ifp->if_flags & IFF_BROADCAST) == 0) 976 return (0); 977 found = 0; 978 /* 979 * Look through the list of addresses for a match 980 * with a broadcast address. 981 */ 982 NET_EPOCH_ENTER(et); 983 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 984 if (ifa->ifa_addr->sa_family == AF_INET && 985 in_ifaddr_broadcast(in, (struct in_ifaddr *)ifa)) { 986 found = 1; 987 break; 988 } 989 NET_EPOCH_EXIT(et); 990 return (found); 991 } 992 993 /* 994 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 995 */ 996 void 997 in_ifdetach(struct ifnet *ifp) 998 { 999 IN_MULTI_LOCK(); 1000 in_pcbpurgeif0(&V_ripcbinfo, ifp); 1001 in_pcbpurgeif0(&V_udbinfo, ifp); 1002 in_pcbpurgeif0(&V_ulitecbinfo, ifp); 1003 in_purgemaddrs(ifp); 1004 IN_MULTI_UNLOCK(); 1005 } 1006 1007 /* 1008 * Delete all IPv4 multicast address records, and associated link-layer 1009 * multicast address records, associated with ifp. 1010 * XXX It looks like domifdetach runs AFTER the link layer cleanup. 1011 * XXX This should not race with ifma_protospec being set during 1012 * a new allocation, if it does, we have bigger problems. 1013 */ 1014 static void 1015 in_purgemaddrs(struct ifnet *ifp) 1016 { 1017 struct in_multi_head purgeinms; 1018 struct in_multi *inm; 1019 struct ifmultiaddr *ifma, *next; 1020 1021 SLIST_INIT(&purgeinms); 1022 IN_MULTI_LIST_LOCK(); 1023 1024 /* 1025 * Extract list of in_multi associated with the detaching ifp 1026 * which the PF_INET layer is about to release. 1027 * We need to do this as IF_ADDR_LOCK() may be re-acquired 1028 * by code further down. 1029 */ 1030 IF_ADDR_WLOCK(ifp); 1031 restart: 1032 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) { 1033 if (ifma->ifma_addr->sa_family != AF_INET || 1034 ifma->ifma_protospec == NULL) 1035 continue; 1036 inm = (struct in_multi *)ifma->ifma_protospec; 1037 inm_rele_locked(&purgeinms, inm); 1038 if (__predict_false(ifma_restart)) { 1039 ifma_restart = true; 1040 goto restart; 1041 } 1042 } 1043 IF_ADDR_WUNLOCK(ifp); 1044 1045 inm_release_list_deferred(&purgeinms); 1046 igmp_ifdetach(ifp); 1047 IN_MULTI_LIST_UNLOCK(); 1048 } 1049 1050 struct in_llentry { 1051 struct llentry base; 1052 }; 1053 1054 #define IN_LLTBL_DEFAULT_HSIZE 32 1055 #define IN_LLTBL_HASH(k, h) \ 1056 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 1057 1058 /* 1059 * Do actual deallocation of @lle. 1060 */ 1061 static void 1062 in_lltable_destroy_lle_unlocked(epoch_context_t ctx) 1063 { 1064 struct llentry *lle; 1065 1066 lle = __containerof(ctx, struct llentry, lle_epoch_ctx); 1067 LLE_LOCK_DESTROY(lle); 1068 LLE_REQ_DESTROY(lle); 1069 free(lle, M_LLTABLE); 1070 } 1071 1072 /* 1073 * Called by the datapath to indicate that 1074 * the entry was used. 1075 */ 1076 static void 1077 in_lltable_mark_used(struct llentry *lle) 1078 { 1079 1080 LLE_REQ_LOCK(lle); 1081 lle->r_skip_req = 0; 1082 LLE_REQ_UNLOCK(lle); 1083 } 1084 1085 /* 1086 * Called by LLE_FREE_LOCKED when number of references 1087 * drops to zero. 1088 */ 1089 static void 1090 in_lltable_destroy_lle(struct llentry *lle) 1091 { 1092 1093 LLE_WUNLOCK(lle); 1094 epoch_call(net_epoch_preempt, &lle->lle_epoch_ctx, in_lltable_destroy_lle_unlocked); 1095 } 1096 1097 static struct llentry * 1098 in_lltable_new(struct in_addr addr4, u_int flags) 1099 { 1100 struct in_llentry *lle; 1101 1102 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 1103 if (lle == NULL) /* NB: caller generates msg */ 1104 return NULL; 1105 1106 /* 1107 * For IPv4 this will trigger "arpresolve" to generate 1108 * an ARP request. 1109 */ 1110 lle->base.la_expire = time_uptime; /* mark expired */ 1111 lle->base.r_l3addr.addr4 = addr4; 1112 lle->base.lle_refcnt = 1; 1113 lle->base.lle_free = in_lltable_destroy_lle; 1114 LLE_LOCK_INIT(&lle->base); 1115 LLE_REQ_INIT(&lle->base); 1116 callout_init(&lle->base.lle_timer, 1); 1117 1118 return (&lle->base); 1119 } 1120 1121 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 1122 ((((d).s_addr ^ (a).s_addr) & (m).s_addr)) == 0 ) 1123 1124 static int 1125 in_lltable_match_prefix(const struct sockaddr *saddr, 1126 const struct sockaddr *smask, u_int flags, struct llentry *lle) 1127 { 1128 struct in_addr addr, mask, lle_addr; 1129 1130 addr = ((const struct sockaddr_in *)saddr)->sin_addr; 1131 mask = ((const struct sockaddr_in *)smask)->sin_addr; 1132 lle_addr.s_addr = ntohl(lle->r_l3addr.addr4.s_addr); 1133 1134 if (IN_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0) 1135 return (0); 1136 1137 if (lle->la_flags & LLE_IFADDR) { 1138 1139 /* 1140 * Delete LLE_IFADDR records IFF address & flag matches. 1141 * Note that addr is the interface address within prefix 1142 * being matched. 1143 * Note also we should handle 'ifdown' cases without removing 1144 * ifaddr macs. 1145 */ 1146 if (addr.s_addr == lle_addr.s_addr && (flags & LLE_STATIC) != 0) 1147 return (1); 1148 return (0); 1149 } 1150 1151 /* flags & LLE_STATIC means deleting both dynamic and static entries */ 1152 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC)) 1153 return (1); 1154 1155 return (0); 1156 } 1157 1158 static void 1159 in_lltable_free_entry(struct lltable *llt, struct llentry *lle) 1160 { 1161 size_t pkts_dropped; 1162 1163 LLE_WLOCK_ASSERT(lle); 1164 KASSERT(llt != NULL, ("lltable is NULL")); 1165 1166 /* Unlink entry from table if not already */ 1167 if ((lle->la_flags & LLE_LINKED) != 0) { 1168 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp); 1169 lltable_unlink_entry(llt, lle); 1170 } 1171 1172 /* Drop hold queue */ 1173 pkts_dropped = llentry_free(lle); 1174 ARPSTAT_ADD(dropped, pkts_dropped); 1175 } 1176 1177 static int 1178 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr) 1179 { 1180 struct rt_addrinfo info; 1181 struct sockaddr_in rt_key, rt_mask; 1182 struct sockaddr rt_gateway; 1183 int rt_flags; 1184 1185 KASSERT(l3addr->sa_family == AF_INET, 1186 ("sin_family %d", l3addr->sa_family)); 1187 1188 bzero(&rt_key, sizeof(rt_key)); 1189 rt_key.sin_len = sizeof(rt_key); 1190 bzero(&rt_mask, sizeof(rt_mask)); 1191 rt_mask.sin_len = sizeof(rt_mask); 1192 bzero(&rt_gateway, sizeof(rt_gateway)); 1193 rt_gateway.sa_len = sizeof(rt_gateway); 1194 1195 bzero(&info, sizeof(info)); 1196 info.rti_info[RTAX_DST] = (struct sockaddr *)&rt_key; 1197 info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&rt_mask; 1198 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&rt_gateway; 1199 1200 if (rib_lookup_info(ifp->if_fib, l3addr, NHR_REF, 0, &info) != 0) 1201 return (EINVAL); 1202 1203 rt_flags = info.rti_flags; 1204 1205 /* 1206 * If the gateway for an existing host route matches the target L3 1207 * address, which is a special route inserted by some implementation 1208 * such as MANET, and the interface is of the correct type, then 1209 * allow for ARP to proceed. 1210 */ 1211 if (rt_flags & RTF_GATEWAY) { 1212 if (!(rt_flags & RTF_HOST) || !info.rti_ifp || 1213 info.rti_ifp->if_type != IFT_ETHER || 1214 (info.rti_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 || 1215 memcmp(rt_gateway.sa_data, l3addr->sa_data, 1216 sizeof(in_addr_t)) != 0) { 1217 rib_free_info(&info); 1218 return (EINVAL); 1219 } 1220 } 1221 rib_free_info(&info); 1222 1223 /* 1224 * Make sure that at least the destination address is covered 1225 * by the route. This is for handling the case where 2 or more 1226 * interfaces have the same prefix. An incoming packet arrives 1227 * on one interface and the corresponding outgoing packet leaves 1228 * another interface. 1229 */ 1230 if (!(rt_flags & RTF_HOST) && info.rti_ifp != ifp) { 1231 const char *sa, *mask, *addr, *lim; 1232 const struct sockaddr_in *l3sin; 1233 1234 mask = (const char *)&rt_mask; 1235 /* 1236 * Just being extra cautious to avoid some custom 1237 * code getting into trouble. 1238 */ 1239 if ((info.rti_addrs & RTA_NETMASK) == 0) 1240 return (EINVAL); 1241 1242 sa = (const char *)&rt_key; 1243 addr = (const char *)l3addr; 1244 l3sin = (const struct sockaddr_in *)l3addr; 1245 lim = addr + l3sin->sin_len; 1246 1247 for ( ; addr < lim; sa++, mask++, addr++) { 1248 if ((*sa ^ *addr) & *mask) { 1249 #ifdef DIAGNOSTIC 1250 char addrbuf[INET_ADDRSTRLEN]; 1251 1252 log(LOG_INFO, "IPv4 address: \"%s\" " 1253 "is not on the network\n", 1254 inet_ntoa_r(l3sin->sin_addr, addrbuf)); 1255 #endif 1256 return (EINVAL); 1257 } 1258 } 1259 } 1260 1261 return (0); 1262 } 1263 1264 static inline uint32_t 1265 in_lltable_hash_dst(const struct in_addr dst, uint32_t hsize) 1266 { 1267 1268 return (IN_LLTBL_HASH(dst.s_addr, hsize)); 1269 } 1270 1271 static uint32_t 1272 in_lltable_hash(const struct llentry *lle, uint32_t hsize) 1273 { 1274 1275 return (in_lltable_hash_dst(lle->r_l3addr.addr4, hsize)); 1276 } 1277 1278 static void 1279 in_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 1280 { 1281 struct sockaddr_in *sin; 1282 1283 sin = (struct sockaddr_in *)sa; 1284 bzero(sin, sizeof(*sin)); 1285 sin->sin_family = AF_INET; 1286 sin->sin_len = sizeof(*sin); 1287 sin->sin_addr = lle->r_l3addr.addr4; 1288 } 1289 1290 static inline struct llentry * 1291 in_lltable_find_dst(struct lltable *llt, struct in_addr dst) 1292 { 1293 struct llentry *lle; 1294 struct llentries *lleh; 1295 u_int hashidx; 1296 1297 hashidx = in_lltable_hash_dst(dst, llt->llt_hsize); 1298 lleh = &llt->lle_head[hashidx]; 1299 CK_LIST_FOREACH(lle, lleh, lle_next) { 1300 if (lle->la_flags & LLE_DELETED) 1301 continue; 1302 if (lle->r_l3addr.addr4.s_addr == dst.s_addr) 1303 break; 1304 } 1305 1306 return (lle); 1307 } 1308 1309 static void 1310 in_lltable_delete_entry(struct lltable *llt, struct llentry *lle) 1311 { 1312 1313 lle->la_flags |= LLE_DELETED; 1314 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 1315 #ifdef DIAGNOSTIC 1316 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 1317 #endif 1318 llentry_free(lle); 1319 } 1320 1321 static struct llentry * 1322 in_lltable_alloc(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1323 { 1324 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1325 struct ifnet *ifp = llt->llt_ifp; 1326 struct llentry *lle; 1327 char linkhdr[LLE_MAX_LINKHDR]; 1328 size_t linkhdrsize; 1329 int lladdr_off; 1330 1331 KASSERT(l3addr->sa_family == AF_INET, 1332 ("sin_family %d", l3addr->sa_family)); 1333 1334 /* 1335 * A route that covers the given address must have 1336 * been installed 1st because we are doing a resolution, 1337 * verify this. 1338 */ 1339 if (!(flags & LLE_IFADDR) && 1340 in_lltable_rtcheck(ifp, flags, l3addr) != 0) 1341 return (NULL); 1342 1343 lle = in_lltable_new(sin->sin_addr, flags); 1344 if (lle == NULL) { 1345 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 1346 return (NULL); 1347 } 1348 lle->la_flags = flags; 1349 if (flags & LLE_STATIC) 1350 lle->r_flags |= RLLE_VALID; 1351 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 1352 linkhdrsize = LLE_MAX_LINKHDR; 1353 if (lltable_calc_llheader(ifp, AF_INET, IF_LLADDR(ifp), 1354 linkhdr, &linkhdrsize, &lladdr_off) != 0) { 1355 epoch_call(net_epoch_preempt, &lle->lle_epoch_ctx, in_lltable_destroy_lle_unlocked); 1356 return (NULL); 1357 } 1358 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize, 1359 lladdr_off); 1360 lle->la_flags |= LLE_STATIC; 1361 lle->r_flags |= (RLLE_VALID | RLLE_IFADDR); 1362 } 1363 1364 return (lle); 1365 } 1366 1367 /* 1368 * Return NULL if not found or marked for deletion. 1369 * If found return lle read locked. 1370 */ 1371 static struct llentry * 1372 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1373 { 1374 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1375 struct llentry *lle; 1376 1377 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 1378 KASSERT(l3addr->sa_family == AF_INET, 1379 ("sin_family %d", l3addr->sa_family)); 1380 KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) != 1381 (LLE_UNLOCKED | LLE_EXCLUSIVE), 1382 ("wrong lle request flags: %#x", flags)); 1383 1384 lle = in_lltable_find_dst(llt, sin->sin_addr); 1385 if (lle == NULL) 1386 return (NULL); 1387 if (flags & LLE_UNLOCKED) 1388 return (lle); 1389 1390 if (flags & LLE_EXCLUSIVE) 1391 LLE_WLOCK(lle); 1392 else 1393 LLE_RLOCK(lle); 1394 1395 /* 1396 * If the afdata lock is not held, the LLE may have been unlinked while 1397 * we were blocked on the LLE lock. Check for this case. 1398 */ 1399 if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) { 1400 if (flags & LLE_EXCLUSIVE) 1401 LLE_WUNLOCK(lle); 1402 else 1403 LLE_RUNLOCK(lle); 1404 return (NULL); 1405 } 1406 return (lle); 1407 } 1408 1409 static int 1410 in_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 1411 struct sysctl_req *wr) 1412 { 1413 struct ifnet *ifp = llt->llt_ifp; 1414 /* XXX stack use */ 1415 struct { 1416 struct rt_msghdr rtm; 1417 struct sockaddr_in sin; 1418 struct sockaddr_dl sdl; 1419 } arpc; 1420 struct sockaddr_dl *sdl; 1421 int error; 1422 1423 bzero(&arpc, sizeof(arpc)); 1424 /* skip deleted entries */ 1425 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 1426 return (0); 1427 /* Skip if jailed and not a valid IP of the prison. */ 1428 lltable_fill_sa_entry(lle,(struct sockaddr *)&arpc.sin); 1429 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&arpc.sin) != 0) 1430 return (0); 1431 /* 1432 * produce a msg made of: 1433 * struct rt_msghdr; 1434 * struct sockaddr_in; (IPv4) 1435 * struct sockaddr_dl; 1436 */ 1437 arpc.rtm.rtm_msglen = sizeof(arpc); 1438 arpc.rtm.rtm_version = RTM_VERSION; 1439 arpc.rtm.rtm_type = RTM_GET; 1440 arpc.rtm.rtm_flags = RTF_UP; 1441 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1442 1443 /* publish */ 1444 if (lle->la_flags & LLE_PUB) 1445 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1446 1447 sdl = &arpc.sdl; 1448 sdl->sdl_family = AF_LINK; 1449 sdl->sdl_len = sizeof(*sdl); 1450 sdl->sdl_index = ifp->if_index; 1451 sdl->sdl_type = ifp->if_type; 1452 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 1453 sdl->sdl_alen = ifp->if_addrlen; 1454 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1455 } else { 1456 sdl->sdl_alen = 0; 1457 bzero(LLADDR(sdl), ifp->if_addrlen); 1458 } 1459 1460 arpc.rtm.rtm_rmx.rmx_expire = 1461 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1462 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1463 if (lle->la_flags & LLE_STATIC) 1464 arpc.rtm.rtm_flags |= RTF_STATIC; 1465 if (lle->la_flags & LLE_IFADDR) 1466 arpc.rtm.rtm_flags |= RTF_PINNED; 1467 arpc.rtm.rtm_index = ifp->if_index; 1468 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1469 1470 return (error); 1471 } 1472 1473 static struct lltable * 1474 in_lltattach(struct ifnet *ifp) 1475 { 1476 struct lltable *llt; 1477 1478 llt = lltable_allocate_htbl(IN_LLTBL_DEFAULT_HSIZE); 1479 llt->llt_af = AF_INET; 1480 llt->llt_ifp = ifp; 1481 1482 llt->llt_lookup = in_lltable_lookup; 1483 llt->llt_alloc_entry = in_lltable_alloc; 1484 llt->llt_delete_entry = in_lltable_delete_entry; 1485 llt->llt_dump_entry = in_lltable_dump_entry; 1486 llt->llt_hash = in_lltable_hash; 1487 llt->llt_fill_sa_entry = in_lltable_fill_sa_entry; 1488 llt->llt_free_entry = in_lltable_free_entry; 1489 llt->llt_match_prefix = in_lltable_match_prefix; 1490 llt->llt_mark_used = in_lltable_mark_used; 1491 lltable_link(llt); 1492 1493 return (llt); 1494 } 1495 1496 void * 1497 in_domifattach(struct ifnet *ifp) 1498 { 1499 struct in_ifinfo *ii; 1500 1501 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); 1502 1503 ii->ii_llt = in_lltattach(ifp); 1504 ii->ii_igmp = igmp_domifattach(ifp); 1505 1506 return (ii); 1507 } 1508 1509 void 1510 in_domifdetach(struct ifnet *ifp, void *aux) 1511 { 1512 struct in_ifinfo *ii = (struct in_ifinfo *)aux; 1513 1514 igmp_domifdetach(ifp); 1515 lltable_free(ii->ii_llt); 1516 free(ii, M_IFADDR); 1517 } 1518