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