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