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/route/nhop.h> 62 #include <net/route/route_ctl.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 static int in_gifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *); 78 79 static void in_socktrim(struct sockaddr_in *); 80 static void in_purgemaddrs(struct ifnet *); 81 82 VNET_DEFINE_STATIC(int, nosameprefix); 83 #define V_nosameprefix VNET(nosameprefix) 84 SYSCTL_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_VNET | CTLFLAG_RW, 85 &VNET_NAME(nosameprefix), 0, 86 "Refuse to create same prefixes on different interfaces"); 87 88 VNET_DECLARE(struct inpcbinfo, ripcbinfo); 89 #define V_ripcbinfo VNET(ripcbinfo) 90 91 static struct sx in_control_sx; 92 SX_SYSINIT(in_control_sx, &in_control_sx, "in_control"); 93 94 /* 95 * Return 1 if an internet address is for a ``local'' host 96 * (one to which we have a connection). 97 */ 98 int 99 in_localaddr(struct in_addr in) 100 { 101 struct rm_priotracker in_ifa_tracker; 102 u_long i = ntohl(in.s_addr); 103 struct in_ifaddr *ia; 104 105 IN_IFADDR_RLOCK(&in_ifa_tracker); 106 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 107 if ((i & ia->ia_subnetmask) == ia->ia_subnet) { 108 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 109 return (1); 110 } 111 } 112 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 113 return (0); 114 } 115 116 /* 117 * Return 1 if an internet address is for the local host and configured 118 * on one of its interfaces. 119 */ 120 int 121 in_localip(struct in_addr in) 122 { 123 struct rm_priotracker in_ifa_tracker; 124 struct in_ifaddr *ia; 125 126 IN_IFADDR_RLOCK(&in_ifa_tracker); 127 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { 128 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) { 129 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 130 return (1); 131 } 132 } 133 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 134 return (0); 135 } 136 137 /* 138 * Return 1 if an internet address is configured on an interface. 139 */ 140 int 141 in_ifhasaddr(struct ifnet *ifp, struct in_addr in) 142 { 143 struct ifaddr *ifa; 144 struct in_ifaddr *ia; 145 146 NET_EPOCH_ASSERT(); 147 148 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 149 if (ifa->ifa_addr->sa_family != AF_INET) 150 continue; 151 ia = (struct in_ifaddr *)ifa; 152 if (ia->ia_addr.sin_addr.s_addr == in.s_addr) 153 return (1); 154 } 155 156 return (0); 157 } 158 159 /* 160 * Return a reference to the interface address which is different to 161 * the supplied one but with same IP address value. 162 */ 163 static struct in_ifaddr * 164 in_localip_more(struct in_ifaddr *ia) 165 { 166 struct rm_priotracker in_ifa_tracker; 167 in_addr_t in = IA_SIN(ia)->sin_addr.s_addr; 168 struct in_ifaddr *it; 169 170 IN_IFADDR_RLOCK(&in_ifa_tracker); 171 LIST_FOREACH(it, INADDR_HASH(in), ia_hash) { 172 if (it != ia && IA_SIN(it)->sin_addr.s_addr == in) { 173 ifa_ref(&it->ia_ifa); 174 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 175 return (it); 176 } 177 } 178 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 179 180 return (NULL); 181 } 182 183 /* 184 * Determine whether an IP address is in a reserved set of addresses 185 * that may not be forwarded, or whether datagrams to that destination 186 * may be forwarded. 187 */ 188 int 189 in_canforward(struct in_addr in) 190 { 191 u_long i = ntohl(in.s_addr); 192 193 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i) || 194 IN_ZERONET(i) || IN_LOOPBACK(i)) 195 return (0); 196 return (1); 197 } 198 199 /* 200 * Trim a mask in a sockaddr 201 */ 202 static void 203 in_socktrim(struct sockaddr_in *ap) 204 { 205 char *cplim = (char *) &ap->sin_addr; 206 char *cp = (char *) (&ap->sin_addr + 1); 207 208 ap->sin_len = 0; 209 while (--cp >= cplim) 210 if (*cp) { 211 (ap)->sin_len = cp - (char *) (ap) + 1; 212 break; 213 } 214 } 215 216 /* 217 * Generic internet control operations (ioctl's). 218 */ 219 int 220 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 221 struct thread *td) 222 { 223 struct ifreq *ifr = (struct ifreq *)data; 224 struct sockaddr_in *addr = (struct sockaddr_in *)&ifr->ifr_addr; 225 struct epoch_tracker et; 226 struct ifaddr *ifa; 227 struct in_ifaddr *ia; 228 int error; 229 230 if (ifp == NULL) 231 return (EADDRNOTAVAIL); 232 233 /* 234 * Filter out 4 ioctls we implement directly. Forward the rest 235 * to specific functions and ifp->if_ioctl(). 236 */ 237 switch (cmd) { 238 case SIOCGIFADDR: 239 case SIOCGIFBRDADDR: 240 case SIOCGIFDSTADDR: 241 case SIOCGIFNETMASK: 242 break; 243 case SIOCGIFALIAS: 244 sx_xlock(&in_control_sx); 245 error = in_gifaddr_ioctl(cmd, data, ifp, td); 246 sx_xunlock(&in_control_sx); 247 return (error); 248 case SIOCDIFADDR: 249 sx_xlock(&in_control_sx); 250 error = in_difaddr_ioctl(cmd, data, ifp, td); 251 sx_xunlock(&in_control_sx); 252 return (error); 253 case OSIOCAIFADDR: /* 9.x compat */ 254 case SIOCAIFADDR: 255 sx_xlock(&in_control_sx); 256 error = in_aifaddr_ioctl(cmd, data, ifp, td); 257 sx_xunlock(&in_control_sx); 258 return (error); 259 case SIOCSIFADDR: 260 case SIOCSIFBRDADDR: 261 case SIOCSIFDSTADDR: 262 case SIOCSIFNETMASK: 263 /* We no longer support that old commands. */ 264 return (EINVAL); 265 default: 266 if (ifp->if_ioctl == NULL) 267 return (EOPNOTSUPP); 268 return ((*ifp->if_ioctl)(ifp, cmd, data)); 269 } 270 271 if (addr->sin_addr.s_addr != INADDR_ANY && 272 prison_check_ip4(td->td_ucred, &addr->sin_addr) != 0) 273 return (EADDRNOTAVAIL); 274 275 /* 276 * Find address for this interface, if it exists. If an 277 * address was specified, find that one instead of the 278 * first one on the interface, if possible. 279 */ 280 NET_EPOCH_ENTER(et); 281 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 282 if (ifa->ifa_addr->sa_family != AF_INET) 283 continue; 284 ia = (struct in_ifaddr *)ifa; 285 if (ia->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr) 286 break; 287 } 288 if (ifa == NULL) 289 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 290 if (ifa->ifa_addr->sa_family == AF_INET) { 291 ia = (struct in_ifaddr *)ifa; 292 if (prison_check_ip4(td->td_ucred, 293 &ia->ia_addr.sin_addr) == 0) 294 break; 295 } 296 297 if (ifa == NULL) { 298 NET_EPOCH_EXIT(et); 299 return (EADDRNOTAVAIL); 300 } 301 302 error = 0; 303 switch (cmd) { 304 case SIOCGIFADDR: 305 *addr = ia->ia_addr; 306 break; 307 308 case SIOCGIFBRDADDR: 309 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 310 error = EINVAL; 311 break; 312 } 313 *addr = ia->ia_broadaddr; 314 break; 315 316 case SIOCGIFDSTADDR: 317 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 318 error = EINVAL; 319 break; 320 } 321 *addr = ia->ia_dstaddr; 322 break; 323 324 case SIOCGIFNETMASK: 325 *addr = ia->ia_sockmask; 326 break; 327 } 328 329 NET_EPOCH_EXIT(et); 330 331 return (error); 332 } 333 334 static int 335 in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td) 336 { 337 const struct in_aliasreq *ifra = (struct in_aliasreq *)data; 338 const struct sockaddr_in *addr = &ifra->ifra_addr; 339 const struct sockaddr_in *broadaddr = &ifra->ifra_broadaddr; 340 const struct sockaddr_in *mask = &ifra->ifra_mask; 341 const struct sockaddr_in *dstaddr = &ifra->ifra_dstaddr; 342 const int vhid = (cmd == SIOCAIFADDR) ? ifra->ifra_vhid : 0; 343 struct epoch_tracker et; 344 struct ifaddr *ifa; 345 struct in_ifaddr *ia; 346 bool iaIsFirst; 347 int error = 0; 348 349 error = priv_check(td, PRIV_NET_ADDIFADDR); 350 if (error) 351 return (error); 352 353 /* 354 * ifra_addr must be present and be of INET family. 355 * ifra_broadaddr/ifra_dstaddr and ifra_mask are optional. 356 */ 357 if (addr->sin_len != sizeof(struct sockaddr_in) || 358 addr->sin_family != AF_INET) 359 return (EINVAL); 360 if (broadaddr->sin_len != 0 && 361 (broadaddr->sin_len != sizeof(struct sockaddr_in) || 362 broadaddr->sin_family != AF_INET)) 363 return (EINVAL); 364 if (mask->sin_len != 0 && 365 (mask->sin_len != sizeof(struct sockaddr_in) || 366 mask->sin_family != AF_INET)) 367 return (EINVAL); 368 if ((ifp->if_flags & IFF_POINTOPOINT) && 369 (dstaddr->sin_len != sizeof(struct sockaddr_in) || 370 dstaddr->sin_addr.s_addr == INADDR_ANY)) 371 return (EDESTADDRREQ); 372 if (vhid > 0 && carp_attach_p == NULL) 373 return (EPROTONOSUPPORT); 374 375 /* 376 * See whether address already exist. 377 */ 378 iaIsFirst = true; 379 ia = NULL; 380 NET_EPOCH_ENTER(et); 381 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 382 struct in_ifaddr *it; 383 384 if (ifa->ifa_addr->sa_family != AF_INET) 385 continue; 386 387 it = (struct in_ifaddr *)ifa; 388 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr && 389 prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0) 390 ia = it; 391 else 392 iaIsFirst = false; 393 } 394 NET_EPOCH_EXIT(et); 395 396 if (ia != NULL) 397 (void )in_difaddr_ioctl(cmd, data, ifp, td); 398 399 ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK); 400 ia = (struct in_ifaddr *)ifa; 401 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 402 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 403 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 404 callout_init_rw(&ia->ia_garp_timer, &ifp->if_addr_lock, 405 CALLOUT_RETURNUNLOCKED); 406 407 ia->ia_ifp = ifp; 408 ia->ia_addr = *addr; 409 if (mask->sin_len != 0) { 410 ia->ia_sockmask = *mask; 411 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 412 } else { 413 in_addr_t i = ntohl(addr->sin_addr.s_addr); 414 415 /* 416 * Be compatible with network classes, if netmask isn't 417 * supplied, guess it based on classes. 418 */ 419 if (IN_CLASSA(i)) 420 ia->ia_subnetmask = IN_CLASSA_NET; 421 else if (IN_CLASSB(i)) 422 ia->ia_subnetmask = IN_CLASSB_NET; 423 else 424 ia->ia_subnetmask = IN_CLASSC_NET; 425 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 426 } 427 ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask; 428 in_socktrim(&ia->ia_sockmask); 429 430 if (ifp->if_flags & IFF_BROADCAST) { 431 if (broadaddr->sin_len != 0) { 432 ia->ia_broadaddr = *broadaddr; 433 } else if (ia->ia_subnetmask == IN_RFC3021_MASK) { 434 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST; 435 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in); 436 ia->ia_broadaddr.sin_family = AF_INET; 437 } else { 438 ia->ia_broadaddr.sin_addr.s_addr = 439 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 440 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in); 441 ia->ia_broadaddr.sin_family = AF_INET; 442 } 443 } 444 445 if (ifp->if_flags & IFF_POINTOPOINT) 446 ia->ia_dstaddr = *dstaddr; 447 448 /* XXXGL: rtinit() needs this strange assignment. */ 449 if (ifp->if_flags & IFF_LOOPBACK) 450 ia->ia_dstaddr = ia->ia_addr; 451 452 if (vhid != 0) { 453 error = (*carp_attach_p)(&ia->ia_ifa, vhid); 454 if (error) 455 return (error); 456 } 457 458 /* if_addrhead is already referenced by ifa_alloc() */ 459 IF_ADDR_WLOCK(ifp); 460 CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 461 IF_ADDR_WUNLOCK(ifp); 462 463 ifa_ref(ifa); /* in_ifaddrhead */ 464 IN_IFADDR_WLOCK(); 465 CK_STAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link); 466 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 467 IN_IFADDR_WUNLOCK(); 468 469 /* 470 * Give the interface a chance to initialize 471 * if this is its first address, 472 * and to validate the address if necessary. 473 */ 474 if (ifp->if_ioctl != NULL) { 475 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 476 if (error) 477 goto fail1; 478 } 479 480 /* 481 * Add route for the network. 482 */ 483 if (vhid == 0) { 484 int flags = RTF_UP; 485 486 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) 487 flags |= RTF_HOST; 488 489 error = in_addprefix(ia, flags); 490 if (error) 491 goto fail1; 492 } 493 494 /* 495 * Add a loopback route to self. 496 */ 497 if (vhid == 0 && (ifp->if_flags & IFF_LOOPBACK) == 0 && 498 ia->ia_addr.sin_addr.s_addr != INADDR_ANY && 499 !((ifp->if_flags & IFF_POINTOPOINT) && 500 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)) { 501 struct in_ifaddr *eia; 502 503 eia = in_localip_more(ia); 504 505 if (eia == NULL) { 506 error = ifa_add_loopback_route((struct ifaddr *)ia, 507 (struct sockaddr *)&ia->ia_addr); 508 if (error) 509 goto fail2; 510 } else 511 ifa_free(&eia->ia_ifa); 512 } 513 514 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST)) { 515 struct in_addr allhosts_addr; 516 struct in_ifinfo *ii; 517 518 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 519 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 520 521 error = in_joingroup(ifp, &allhosts_addr, NULL, 522 &ii->ii_allhosts); 523 } 524 525 /* 526 * Note: we don't need extra reference for ifa, since we called 527 * with sx lock held, and ifaddr can not be deleted in concurrent 528 * thread. 529 */ 530 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, ifa, IFADDR_EVENT_ADD); 531 532 return (error); 533 534 fail2: 535 if (vhid == 0) 536 (void )in_scrubprefix(ia, LLE_STATIC); 537 538 fail1: 539 if (ia->ia_ifa.ifa_carp) 540 (*carp_detach_p)(&ia->ia_ifa, false); 541 542 IF_ADDR_WLOCK(ifp); 543 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link); 544 IF_ADDR_WUNLOCK(ifp); 545 ifa_free(&ia->ia_ifa); /* if_addrhead */ 546 547 IN_IFADDR_WLOCK(); 548 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link); 549 LIST_REMOVE(ia, ia_hash); 550 IN_IFADDR_WUNLOCK(); 551 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 552 553 return (error); 554 } 555 556 static int 557 in_difaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td) 558 { 559 const struct ifreq *ifr = (struct ifreq *)data; 560 const struct sockaddr_in *addr = (const struct sockaddr_in *) 561 &ifr->ifr_addr; 562 struct ifaddr *ifa; 563 struct in_ifaddr *ia; 564 bool deleteAny, iaIsLast; 565 int error; 566 567 if (td != NULL) { 568 error = priv_check(td, PRIV_NET_DELIFADDR); 569 if (error) 570 return (error); 571 } 572 573 if (addr->sin_len != sizeof(struct sockaddr_in) || 574 addr->sin_family != AF_INET) 575 deleteAny = true; 576 else 577 deleteAny = false; 578 579 iaIsLast = true; 580 ia = NULL; 581 IF_ADDR_WLOCK(ifp); 582 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 583 struct in_ifaddr *it; 584 585 if (ifa->ifa_addr->sa_family != AF_INET) 586 continue; 587 588 it = (struct in_ifaddr *)ifa; 589 if (deleteAny && ia == NULL && (td == NULL || 590 prison_check_ip4(td->td_ucred, &it->ia_addr.sin_addr) == 0)) 591 ia = it; 592 593 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr && 594 (td == NULL || prison_check_ip4(td->td_ucred, 595 &addr->sin_addr) == 0)) 596 ia = it; 597 598 if (it != ia) 599 iaIsLast = false; 600 } 601 602 if (ia == NULL) { 603 IF_ADDR_WUNLOCK(ifp); 604 return (EADDRNOTAVAIL); 605 } 606 607 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link); 608 IF_ADDR_WUNLOCK(ifp); 609 ifa_free(&ia->ia_ifa); /* if_addrhead */ 610 611 IN_IFADDR_WLOCK(); 612 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link); 613 LIST_REMOVE(ia, ia_hash); 614 IN_IFADDR_WUNLOCK(); 615 616 /* 617 * in_scrubprefix() kills the interface route. 618 */ 619 in_scrubprefix(ia, LLE_STATIC); 620 621 /* 622 * in_ifadown gets rid of all the rest of 623 * the routes. This is not quite the right 624 * thing to do, but at least if we are running 625 * a routing process they will come back. 626 */ 627 in_ifadown(&ia->ia_ifa, 1); 628 629 if (ia->ia_ifa.ifa_carp) 630 (*carp_detach_p)(&ia->ia_ifa, cmd == SIOCAIFADDR); 631 632 /* 633 * If this is the last IPv4 address configured on this 634 * interface, leave the all-hosts group. 635 * No state-change report need be transmitted. 636 */ 637 if (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) { 638 struct in_ifinfo *ii; 639 640 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 641 if (ii->ii_allhosts) { 642 (void)in_leavegroup(ii->ii_allhosts, NULL); 643 ii->ii_allhosts = NULL; 644 } 645 } 646 647 IF_ADDR_WLOCK(ifp); 648 if (callout_stop(&ia->ia_garp_timer) == 1) { 649 ifa_free(&ia->ia_ifa); 650 } 651 IF_ADDR_WUNLOCK(ifp); 652 653 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa, 654 IFADDR_EVENT_DEL); 655 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 656 657 return (0); 658 } 659 660 static int 661 in_gifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td) 662 { 663 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 664 const struct sockaddr_in *addr = &ifra->ifra_addr; 665 struct epoch_tracker et; 666 struct ifaddr *ifa; 667 struct in_ifaddr *ia; 668 669 /* 670 * ifra_addr must be present and be of INET family. 671 */ 672 if (addr->sin_len != sizeof(struct sockaddr_in) || 673 addr->sin_family != AF_INET) 674 return (EINVAL); 675 676 /* 677 * See whether address exist. 678 */ 679 ia = NULL; 680 NET_EPOCH_ENTER(et); 681 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 682 struct in_ifaddr *it; 683 684 if (ifa->ifa_addr->sa_family != AF_INET) 685 continue; 686 687 it = (struct in_ifaddr *)ifa; 688 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr && 689 prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0) { 690 ia = it; 691 break; 692 } 693 } 694 if (ia == NULL) { 695 NET_EPOCH_EXIT(et); 696 return (EADDRNOTAVAIL); 697 } 698 699 ifra->ifra_mask = ia->ia_sockmask; 700 if ((ifp->if_flags & IFF_POINTOPOINT) && 701 ia->ia_dstaddr.sin_family == AF_INET) 702 ifra->ifra_dstaddr = ia->ia_dstaddr; 703 else if ((ifp->if_flags & IFF_BROADCAST) && 704 ia->ia_broadaddr.sin_family == AF_INET) 705 ifra->ifra_broadaddr = ia->ia_broadaddr; 706 else 707 memset(&ifra->ifra_broadaddr, 0, 708 sizeof(ifra->ifra_broadaddr)); 709 710 NET_EPOCH_EXIT(et); 711 return (0); 712 } 713 714 static int 715 in_match_ifaddr(const struct rtentry *rt, const struct nhop_object *nh, void *arg) 716 { 717 718 if (nh->nh_ifa == (struct ifaddr *)arg) 719 return (1); 720 721 return (0); 722 } 723 724 static int 725 in_handle_prefix_route(uint32_t fibnum, int cmd, 726 struct sockaddr_in *dst, struct sockaddr_in *netmask, struct ifaddr *ifa) 727 { 728 729 NET_EPOCH_ASSERT(); 730 731 /* Prepare gateway */ 732 struct sockaddr_dl_short sdl = { 733 .sdl_family = AF_LINK, 734 .sdl_len = sizeof(struct sockaddr_dl_short), 735 .sdl_type = ifa->ifa_ifp->if_type, 736 .sdl_index = ifa->ifa_ifp->if_index, 737 }; 738 739 struct rt_addrinfo info = { 740 .rti_ifa = ifa, 741 .rti_flags = RTF_PINNED | ((netmask != NULL) ? 0 : RTF_HOST), 742 .rti_info = { 743 [RTAX_DST] = (struct sockaddr *)dst, 744 [RTAX_NETMASK] = (struct sockaddr *)netmask, 745 [RTAX_GATEWAY] = (struct sockaddr *)&sdl, 746 }, 747 /* Ensure we delete the prefix IFF prefix ifa matches */ 748 .rti_filter = in_match_ifaddr, 749 .rti_filterdata = ifa, 750 }; 751 752 return (rib_handle_ifaddr_info(fibnum, cmd, &info)); 753 } 754 755 /* 756 * Adds or delete interface route corresponding to @ifa. 757 * There can be multiple options: 758 * 1) Adding addr with prefix on non-p2p/non-lo interface. 759 * Example: 192.0.2.1/24. Action: add route towards 760 * 192.0.2.0/24 via this interface, using ifa as an address source. 761 * Note: route to 192.0.2.1 will be installed separately via 762 * ifa_maintain_loopback_route(). 763 * 2) Adding addr with "host" mask. 764 * Example: 192.0.2.2/32. In this case no action is performed, 765 * as the route should be installed by ifa_maintain_loopback_route(). 766 * Returns 0 to indicate success. 767 * 3) Adding address with or without prefix to p2p interface. 768 * Example: 10.0.0.1/24->10.0.0.2. In this case, all other addresses 769 * covered by prefix, does not make sense in the context of p2p link. 770 * Action: add route towards 10.0.0.2 via this interface, using ifa as an 771 * address source. 772 * Similar to (1), route to 10.0.0.1 will be installed by 773 * ifa_maintain_loopback_route(). 774 * 4) Adding address with or without prefix to loopback interface. 775 * Example: 192.0.2.1/24. In this case, trafic to non-host addresses cannot 776 * be forwarded, as it would introduce an infinite cycle. 777 * Similar to (2), perform no action and return 0. Loopback route 778 * will be installed by ifa_maintain_loopback_route(). 779 */ 780 int 781 in_handle_ifaddr_route(int cmd, struct in_ifaddr *ia) 782 { 783 struct ifaddr *ifa = &ia->ia_ifa; 784 struct in_addr daddr, maddr; 785 struct sockaddr_in *pmask; 786 struct epoch_tracker et; 787 int error; 788 789 /* Case 4: ignore loopbacks */ 790 if (ifa->ifa_ifp->if_flags & IFF_LOOPBACK) 791 return (0); 792 793 if (ifa->ifa_ifp->if_flags & IFF_POINTOPOINT) { 794 /* Case 3: install route towards dst addr */ 795 daddr = ia->ia_dstaddr.sin_addr; 796 pmask = NULL; 797 maddr.s_addr = INADDR_BROADCAST; 798 } else { 799 daddr = ia->ia_addr.sin_addr; 800 pmask = &ia->ia_sockmask; 801 maddr = pmask->sin_addr; 802 803 if (maddr.s_addr == INADDR_BROADCAST) { 804 /* Case 2: ignore /32 routes */ 805 return (0); 806 } 807 } 808 809 struct sockaddr_in mask = { 810 .sin_family = AF_INET, 811 .sin_len = sizeof(struct sockaddr_in), 812 .sin_addr = maddr, 813 }; 814 815 if (pmask != NULL) 816 pmask = &mask; 817 818 struct sockaddr_in dst = { 819 .sin_family = AF_INET, 820 .sin_len = sizeof(struct sockaddr_in), 821 .sin_addr.s_addr = daddr.s_addr & maddr.s_addr, 822 }; 823 824 uint32_t fibnum = ifa->ifa_ifp->if_fib; 825 NET_EPOCH_ENTER(et); 826 error = in_handle_prefix_route(fibnum, cmd, &dst, pmask, ifa); 827 NET_EPOCH_EXIT(et); 828 829 return (error); 830 } 831 832 833 #define rtinitflags(x) \ 834 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 835 ? RTF_HOST : 0) 836 837 /* 838 * Check if we have a route for the given prefix already. 839 */ 840 static bool 841 in_hasrtprefix(struct in_ifaddr *target, int flags) 842 { 843 struct rm_priotracker in_ifa_tracker; 844 struct in_ifaddr *ia; 845 struct in_addr prefix, mask, p, m; 846 bool result = false; 847 848 if ((flags & RTF_HOST) != 0) { 849 prefix = target->ia_dstaddr.sin_addr; 850 mask.s_addr = 0; 851 } else { 852 prefix = target->ia_addr.sin_addr; 853 mask = target->ia_sockmask.sin_addr; 854 prefix.s_addr &= mask.s_addr; 855 } 856 857 IN_IFADDR_RLOCK(&in_ifa_tracker); 858 /* Look for an existing address with the same prefix, mask, and fib */ 859 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 860 if (rtinitflags(ia)) { 861 p = ia->ia_dstaddr.sin_addr; 862 863 if (prefix.s_addr != p.s_addr) 864 continue; 865 } else { 866 p = ia->ia_addr.sin_addr; 867 m = ia->ia_sockmask.sin_addr; 868 p.s_addr &= m.s_addr; 869 870 if (prefix.s_addr != p.s_addr || 871 mask.s_addr != m.s_addr) 872 continue; 873 } 874 if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib) 875 continue; 876 877 /* 878 * If we got a matching prefix route inserted by other 879 * interface address, we are done here. 880 */ 881 if (ia->ia_flags & IFA_ROUTE) { 882 result = true; 883 break; 884 } 885 } 886 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 887 888 return (result); 889 } 890 891 int 892 in_addprefix(struct in_ifaddr *target, int flags) 893 { 894 int error; 895 896 if (in_hasrtprefix(target, flags)) { 897 if (V_nosameprefix) 898 return (EEXIST); 899 else { 900 rt_addrmsg(RTM_ADD, &target->ia_ifa, 901 target->ia_ifp->if_fib); 902 return (0); 903 } 904 } 905 906 /* 907 * No-one seem to have this prefix route, so we try to insert it. 908 */ 909 rt_addrmsg(RTM_ADD, &target->ia_ifa, target->ia_ifp->if_fib); 910 error = in_handle_ifaddr_route(RTM_ADD, target); 911 if (!error) 912 target->ia_flags |= IFA_ROUTE; 913 return (error); 914 } 915 916 /* 917 * Removes either all lle entries for given @ia, or lle 918 * corresponding to @ia address. 919 */ 920 static void 921 in_scrubprefixlle(struct in_ifaddr *ia, int all, u_int flags) 922 { 923 struct sockaddr_in addr, mask; 924 struct sockaddr *saddr, *smask; 925 struct ifnet *ifp; 926 927 saddr = (struct sockaddr *)&addr; 928 bzero(&addr, sizeof(addr)); 929 addr.sin_len = sizeof(addr); 930 addr.sin_family = AF_INET; 931 smask = (struct sockaddr *)&mask; 932 bzero(&mask, sizeof(mask)); 933 mask.sin_len = sizeof(mask); 934 mask.sin_family = AF_INET; 935 mask.sin_addr.s_addr = ia->ia_subnetmask; 936 ifp = ia->ia_ifp; 937 938 if (all) { 939 /* 940 * Remove all L2 entries matching given prefix. 941 * Convert address to host representation to avoid 942 * doing this on every callback. ia_subnetmask is already 943 * stored in host representation. 944 */ 945 addr.sin_addr.s_addr = ntohl(ia->ia_addr.sin_addr.s_addr); 946 lltable_prefix_free(AF_INET, saddr, smask, flags); 947 } else { 948 /* Remove interface address only */ 949 addr.sin_addr.s_addr = ia->ia_addr.sin_addr.s_addr; 950 lltable_delete_addr(LLTABLE(ifp), LLE_IFADDR, saddr); 951 } 952 } 953 954 /* 955 * If there is no other address in the system that can serve a route to the 956 * same prefix, remove the route. Hand over the route to the new address 957 * otherwise. 958 */ 959 int 960 in_scrubprefix(struct in_ifaddr *target, u_int flags) 961 { 962 struct rm_priotracker in_ifa_tracker; 963 struct in_ifaddr *ia; 964 struct in_addr prefix, mask, p, m; 965 int error = 0; 966 967 /* 968 * Remove the loopback route to the interface address. 969 */ 970 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) && 971 !(target->ia_ifp->if_flags & IFF_LOOPBACK) && 972 (flags & LLE_STATIC)) { 973 struct in_ifaddr *eia; 974 975 /* 976 * XXXME: add fib-aware in_localip. 977 * We definitely don't want to switch between 978 * prefixes in different fibs. 979 */ 980 eia = in_localip_more(target); 981 982 if (eia != NULL) { 983 error = ifa_switch_loopback_route((struct ifaddr *)eia, 984 (struct sockaddr *)&target->ia_addr); 985 ifa_free(&eia->ia_ifa); 986 } else { 987 error = ifa_del_loopback_route((struct ifaddr *)target, 988 (struct sockaddr *)&target->ia_addr); 989 } 990 } 991 992 if (rtinitflags(target)) { 993 prefix = target->ia_dstaddr.sin_addr; 994 mask.s_addr = 0; 995 } else { 996 prefix = target->ia_addr.sin_addr; 997 mask = target->ia_sockmask.sin_addr; 998 prefix.s_addr &= mask.s_addr; 999 } 1000 1001 if ((target->ia_flags & IFA_ROUTE) == 0) { 1002 rt_addrmsg(RTM_DELETE, &target->ia_ifa, target->ia_ifp->if_fib); 1003 1004 /* 1005 * Removing address from !IFF_UP interface or 1006 * prefix which exists on other interface (along with route). 1007 * No entries should exist here except target addr. 1008 * Given that, delete this entry only. 1009 */ 1010 in_scrubprefixlle(target, 0, flags); 1011 return (0); 1012 } 1013 1014 IN_IFADDR_RLOCK(&in_ifa_tracker); 1015 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1016 if (rtinitflags(ia)) { 1017 p = ia->ia_dstaddr.sin_addr; 1018 1019 if (prefix.s_addr != p.s_addr) 1020 continue; 1021 } else { 1022 p = ia->ia_addr.sin_addr; 1023 m = ia->ia_sockmask.sin_addr; 1024 p.s_addr &= m.s_addr; 1025 1026 if (prefix.s_addr != p.s_addr || 1027 mask.s_addr != m.s_addr) 1028 continue; 1029 } 1030 1031 if ((ia->ia_ifp->if_flags & IFF_UP) == 0) 1032 continue; 1033 1034 /* 1035 * If we got a matching prefix address, move IFA_ROUTE and 1036 * the route itself to it. Make sure that routing daemons 1037 * get a heads-up. 1038 */ 1039 if ((ia->ia_flags & IFA_ROUTE) == 0) { 1040 ifa_ref(&ia->ia_ifa); 1041 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 1042 error = in_handle_ifaddr_route(RTM_DELETE, target); 1043 if (error == 0) 1044 target->ia_flags &= ~IFA_ROUTE; 1045 else 1046 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n", 1047 error); 1048 /* Scrub all entries IFF interface is different */ 1049 in_scrubprefixlle(target, target->ia_ifp != ia->ia_ifp, 1050 flags); 1051 error = in_handle_ifaddr_route(RTM_ADD, ia); 1052 if (error == 0) 1053 ia->ia_flags |= IFA_ROUTE; 1054 else 1055 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n", 1056 error); 1057 ifa_free(&ia->ia_ifa); 1058 return (error); 1059 } 1060 } 1061 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 1062 1063 /* 1064 * remove all L2 entries on the given prefix 1065 */ 1066 in_scrubprefixlle(target, 1, flags); 1067 1068 /* 1069 * As no-one seem to have this prefix, we can remove the route. 1070 */ 1071 rt_addrmsg(RTM_DELETE, &target->ia_ifa, target->ia_ifp->if_fib); 1072 error = in_handle_ifaddr_route(RTM_DELETE, target); 1073 if (error == 0) 1074 target->ia_flags &= ~IFA_ROUTE; 1075 else 1076 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error); 1077 return (error); 1078 } 1079 1080 #undef rtinitflags 1081 1082 void 1083 in_ifscrub_all(void) 1084 { 1085 struct ifnet *ifp; 1086 struct ifaddr *ifa, *nifa; 1087 struct ifaliasreq ifr; 1088 1089 IFNET_RLOCK(); 1090 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1091 /* Cannot lock here - lock recursion. */ 1092 /* NET_EPOCH_ENTER(et); */ 1093 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) { 1094 if (ifa->ifa_addr->sa_family != AF_INET) 1095 continue; 1096 1097 /* 1098 * This is ugly but the only way for legacy IP to 1099 * cleanly remove addresses and everything attached. 1100 */ 1101 bzero(&ifr, sizeof(ifr)); 1102 ifr.ifra_addr = *ifa->ifa_addr; 1103 if (ifa->ifa_dstaddr) 1104 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 1105 (void)in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, 1106 ifp, NULL); 1107 } 1108 /* NET_EPOCH_EXIT(et); */ 1109 in_purgemaddrs(ifp); 1110 igmp_domifdetach(ifp); 1111 } 1112 IFNET_RUNLOCK(); 1113 } 1114 1115 int 1116 in_ifaddr_broadcast(struct in_addr in, struct in_ifaddr *ia) 1117 { 1118 1119 return ((in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1120 /* 1121 * Check for old-style (host 0) broadcast, but 1122 * taking into account that RFC 3021 obsoletes it. 1123 */ 1124 (ia->ia_subnetmask != IN_RFC3021_MASK && 1125 ntohl(in.s_addr) == ia->ia_subnet)) && 1126 /* 1127 * Check for an all one subnetmask. These 1128 * only exist when an interface gets a secondary 1129 * address. 1130 */ 1131 ia->ia_subnetmask != (u_long)0xffffffff); 1132 } 1133 1134 /* 1135 * Return 1 if the address might be a local broadcast address. 1136 */ 1137 int 1138 in_broadcast(struct in_addr in, struct ifnet *ifp) 1139 { 1140 struct ifaddr *ifa; 1141 int found; 1142 1143 NET_EPOCH_ASSERT(); 1144 1145 if (in.s_addr == INADDR_BROADCAST || 1146 in.s_addr == INADDR_ANY) 1147 return (1); 1148 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1149 return (0); 1150 found = 0; 1151 /* 1152 * Look through the list of addresses for a match 1153 * with a broadcast address. 1154 */ 1155 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1156 if (ifa->ifa_addr->sa_family == AF_INET && 1157 in_ifaddr_broadcast(in, (struct in_ifaddr *)ifa)) { 1158 found = 1; 1159 break; 1160 } 1161 return (found); 1162 } 1163 1164 /* 1165 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 1166 */ 1167 void 1168 in_ifdetach(struct ifnet *ifp) 1169 { 1170 IN_MULTI_LOCK(); 1171 in_pcbpurgeif0(&V_ripcbinfo, ifp); 1172 in_pcbpurgeif0(&V_udbinfo, ifp); 1173 in_pcbpurgeif0(&V_ulitecbinfo, ifp); 1174 in_purgemaddrs(ifp); 1175 IN_MULTI_UNLOCK(); 1176 1177 /* 1178 * Make sure all multicast deletions invoking if_ioctl() are 1179 * completed before returning. Else we risk accessing a freed 1180 * ifnet structure pointer. 1181 */ 1182 inm_release_wait(NULL); 1183 } 1184 1185 /* 1186 * Delete all IPv4 multicast address records, and associated link-layer 1187 * multicast address records, associated with ifp. 1188 * XXX It looks like domifdetach runs AFTER the link layer cleanup. 1189 * XXX This should not race with ifma_protospec being set during 1190 * a new allocation, if it does, we have bigger problems. 1191 */ 1192 static void 1193 in_purgemaddrs(struct ifnet *ifp) 1194 { 1195 struct in_multi_head purgeinms; 1196 struct in_multi *inm; 1197 struct ifmultiaddr *ifma, *next; 1198 1199 SLIST_INIT(&purgeinms); 1200 IN_MULTI_LIST_LOCK(); 1201 1202 /* 1203 * Extract list of in_multi associated with the detaching ifp 1204 * which the PF_INET layer is about to release. 1205 * We need to do this as IF_ADDR_LOCK() may be re-acquired 1206 * by code further down. 1207 */ 1208 IF_ADDR_WLOCK(ifp); 1209 restart: 1210 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) { 1211 if (ifma->ifma_addr->sa_family != AF_INET || 1212 ifma->ifma_protospec == NULL) 1213 continue; 1214 inm = (struct in_multi *)ifma->ifma_protospec; 1215 inm_rele_locked(&purgeinms, inm); 1216 if (__predict_false(ifma_restart)) { 1217 ifma_restart = true; 1218 goto restart; 1219 } 1220 } 1221 IF_ADDR_WUNLOCK(ifp); 1222 1223 inm_release_list_deferred(&purgeinms); 1224 igmp_ifdetach(ifp); 1225 IN_MULTI_LIST_UNLOCK(); 1226 } 1227 1228 struct in_llentry { 1229 struct llentry base; 1230 }; 1231 1232 #define IN_LLTBL_DEFAULT_HSIZE 32 1233 #define IN_LLTBL_HASH(k, h) \ 1234 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 1235 1236 /* 1237 * Do actual deallocation of @lle. 1238 */ 1239 static void 1240 in_lltable_destroy_lle_unlocked(epoch_context_t ctx) 1241 { 1242 struct llentry *lle; 1243 1244 lle = __containerof(ctx, struct llentry, lle_epoch_ctx); 1245 LLE_LOCK_DESTROY(lle); 1246 LLE_REQ_DESTROY(lle); 1247 free(lle, M_LLTABLE); 1248 } 1249 1250 /* 1251 * Called by the datapath to indicate that 1252 * the entry was used. 1253 */ 1254 static void 1255 in_lltable_mark_used(struct llentry *lle) 1256 { 1257 1258 LLE_REQ_LOCK(lle); 1259 lle->r_skip_req = 0; 1260 LLE_REQ_UNLOCK(lle); 1261 } 1262 1263 /* 1264 * Called by LLE_FREE_LOCKED when number of references 1265 * drops to zero. 1266 */ 1267 static void 1268 in_lltable_destroy_lle(struct llentry *lle) 1269 { 1270 1271 LLE_WUNLOCK(lle); 1272 NET_EPOCH_CALL(in_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx); 1273 } 1274 1275 static struct llentry * 1276 in_lltable_new(struct in_addr addr4, u_int flags) 1277 { 1278 struct in_llentry *lle; 1279 1280 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 1281 if (lle == NULL) /* NB: caller generates msg */ 1282 return NULL; 1283 1284 /* 1285 * For IPv4 this will trigger "arpresolve" to generate 1286 * an ARP request. 1287 */ 1288 lle->base.la_expire = time_uptime; /* mark expired */ 1289 lle->base.r_l3addr.addr4 = addr4; 1290 lle->base.lle_refcnt = 1; 1291 lle->base.lle_free = in_lltable_destroy_lle; 1292 LLE_LOCK_INIT(&lle->base); 1293 LLE_REQ_INIT(&lle->base); 1294 callout_init(&lle->base.lle_timer, 1); 1295 1296 return (&lle->base); 1297 } 1298 1299 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 1300 ((((d).s_addr ^ (a).s_addr) & (m).s_addr)) == 0 ) 1301 1302 static int 1303 in_lltable_match_prefix(const struct sockaddr *saddr, 1304 const struct sockaddr *smask, u_int flags, struct llentry *lle) 1305 { 1306 struct in_addr addr, mask, lle_addr; 1307 1308 addr = ((const struct sockaddr_in *)saddr)->sin_addr; 1309 mask = ((const struct sockaddr_in *)smask)->sin_addr; 1310 lle_addr.s_addr = ntohl(lle->r_l3addr.addr4.s_addr); 1311 1312 if (IN_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0) 1313 return (0); 1314 1315 if (lle->la_flags & LLE_IFADDR) { 1316 /* 1317 * Delete LLE_IFADDR records IFF address & flag matches. 1318 * Note that addr is the interface address within prefix 1319 * being matched. 1320 * Note also we should handle 'ifdown' cases without removing 1321 * ifaddr macs. 1322 */ 1323 if (addr.s_addr == lle_addr.s_addr && (flags & LLE_STATIC) != 0) 1324 return (1); 1325 return (0); 1326 } 1327 1328 /* flags & LLE_STATIC means deleting both dynamic and static entries */ 1329 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC)) 1330 return (1); 1331 1332 return (0); 1333 } 1334 1335 static void 1336 in_lltable_free_entry(struct lltable *llt, struct llentry *lle) 1337 { 1338 size_t pkts_dropped; 1339 1340 LLE_WLOCK_ASSERT(lle); 1341 KASSERT(llt != NULL, ("lltable is NULL")); 1342 1343 /* Unlink entry from table if not already */ 1344 if ((lle->la_flags & LLE_LINKED) != 0) { 1345 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp); 1346 lltable_unlink_entry(llt, lle); 1347 } 1348 1349 /* Drop hold queue */ 1350 pkts_dropped = llentry_free(lle); 1351 ARPSTAT_ADD(dropped, pkts_dropped); 1352 } 1353 1354 static int 1355 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr) 1356 { 1357 struct rt_addrinfo info; 1358 struct sockaddr_in rt_key, rt_mask; 1359 struct sockaddr rt_gateway; 1360 int rt_flags; 1361 1362 KASSERT(l3addr->sa_family == AF_INET, 1363 ("sin_family %d", l3addr->sa_family)); 1364 1365 bzero(&rt_key, sizeof(rt_key)); 1366 rt_key.sin_len = sizeof(rt_key); 1367 bzero(&rt_mask, sizeof(rt_mask)); 1368 rt_mask.sin_len = sizeof(rt_mask); 1369 bzero(&rt_gateway, sizeof(rt_gateway)); 1370 rt_gateway.sa_len = sizeof(rt_gateway); 1371 1372 bzero(&info, sizeof(info)); 1373 info.rti_info[RTAX_DST] = (struct sockaddr *)&rt_key; 1374 info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&rt_mask; 1375 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&rt_gateway; 1376 1377 if (rib_lookup_info(ifp->if_fib, l3addr, NHR_REF, 0, &info) != 0) 1378 return (EINVAL); 1379 1380 rt_flags = info.rti_flags; 1381 1382 /* 1383 * If the gateway for an existing host route matches the target L3 1384 * address, which is a special route inserted by some implementation 1385 * such as MANET, and the interface is of the correct type, then 1386 * allow for ARP to proceed. 1387 */ 1388 if (rt_flags & RTF_GATEWAY) { 1389 if (!(rt_flags & RTF_HOST) || !info.rti_ifp || 1390 info.rti_ifp->if_type != IFT_ETHER || 1391 (info.rti_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 || 1392 memcmp(rt_gateway.sa_data, l3addr->sa_data, 1393 sizeof(in_addr_t)) != 0) { 1394 rib_free_info(&info); 1395 return (EINVAL); 1396 } 1397 } 1398 rib_free_info(&info); 1399 1400 /* 1401 * Make sure that at least the destination address is covered 1402 * by the route. This is for handling the case where 2 or more 1403 * interfaces have the same prefix. An incoming packet arrives 1404 * on one interface and the corresponding outgoing packet leaves 1405 * another interface. 1406 */ 1407 if (!(rt_flags & RTF_HOST) && info.rti_ifp != ifp) { 1408 const char *sa, *mask, *addr, *lim; 1409 const struct sockaddr_in *l3sin; 1410 1411 mask = (const char *)&rt_mask; 1412 /* 1413 * Just being extra cautious to avoid some custom 1414 * code getting into trouble. 1415 */ 1416 if ((info.rti_addrs & RTA_NETMASK) == 0) 1417 return (EINVAL); 1418 1419 sa = (const char *)&rt_key; 1420 addr = (const char *)l3addr; 1421 l3sin = (const struct sockaddr_in *)l3addr; 1422 lim = addr + l3sin->sin_len; 1423 1424 for ( ; addr < lim; sa++, mask++, addr++) { 1425 if ((*sa ^ *addr) & *mask) { 1426 #ifdef DIAGNOSTIC 1427 char addrbuf[INET_ADDRSTRLEN]; 1428 1429 log(LOG_INFO, "IPv4 address: \"%s\" " 1430 "is not on the network\n", 1431 inet_ntoa_r(l3sin->sin_addr, addrbuf)); 1432 #endif 1433 return (EINVAL); 1434 } 1435 } 1436 } 1437 1438 return (0); 1439 } 1440 1441 static inline uint32_t 1442 in_lltable_hash_dst(const struct in_addr dst, uint32_t hsize) 1443 { 1444 1445 return (IN_LLTBL_HASH(dst.s_addr, hsize)); 1446 } 1447 1448 static uint32_t 1449 in_lltable_hash(const struct llentry *lle, uint32_t hsize) 1450 { 1451 1452 return (in_lltable_hash_dst(lle->r_l3addr.addr4, hsize)); 1453 } 1454 1455 static void 1456 in_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 1457 { 1458 struct sockaddr_in *sin; 1459 1460 sin = (struct sockaddr_in *)sa; 1461 bzero(sin, sizeof(*sin)); 1462 sin->sin_family = AF_INET; 1463 sin->sin_len = sizeof(*sin); 1464 sin->sin_addr = lle->r_l3addr.addr4; 1465 } 1466 1467 static inline struct llentry * 1468 in_lltable_find_dst(struct lltable *llt, struct in_addr dst) 1469 { 1470 struct llentry *lle; 1471 struct llentries *lleh; 1472 u_int hashidx; 1473 1474 hashidx = in_lltable_hash_dst(dst, llt->llt_hsize); 1475 lleh = &llt->lle_head[hashidx]; 1476 CK_LIST_FOREACH(lle, lleh, lle_next) { 1477 if (lle->la_flags & LLE_DELETED) 1478 continue; 1479 if (lle->r_l3addr.addr4.s_addr == dst.s_addr) 1480 break; 1481 } 1482 1483 return (lle); 1484 } 1485 1486 static void 1487 in_lltable_delete_entry(struct lltable *llt, struct llentry *lle) 1488 { 1489 1490 lle->la_flags |= LLE_DELETED; 1491 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 1492 #ifdef DIAGNOSTIC 1493 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 1494 #endif 1495 llentry_free(lle); 1496 } 1497 1498 static struct llentry * 1499 in_lltable_alloc(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1500 { 1501 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1502 struct ifnet *ifp = llt->llt_ifp; 1503 struct llentry *lle; 1504 char linkhdr[LLE_MAX_LINKHDR]; 1505 size_t linkhdrsize; 1506 int lladdr_off; 1507 1508 KASSERT(l3addr->sa_family == AF_INET, 1509 ("sin_family %d", l3addr->sa_family)); 1510 1511 /* 1512 * A route that covers the given address must have 1513 * been installed 1st because we are doing a resolution, 1514 * verify this. 1515 */ 1516 if (!(flags & LLE_IFADDR) && 1517 in_lltable_rtcheck(ifp, flags, l3addr) != 0) 1518 return (NULL); 1519 1520 lle = in_lltable_new(sin->sin_addr, flags); 1521 if (lle == NULL) { 1522 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 1523 return (NULL); 1524 } 1525 lle->la_flags = flags; 1526 if (flags & LLE_STATIC) 1527 lle->r_flags |= RLLE_VALID; 1528 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 1529 linkhdrsize = LLE_MAX_LINKHDR; 1530 if (lltable_calc_llheader(ifp, AF_INET, IF_LLADDR(ifp), 1531 linkhdr, &linkhdrsize, &lladdr_off) != 0) { 1532 NET_EPOCH_CALL(in_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx); 1533 return (NULL); 1534 } 1535 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize, 1536 lladdr_off); 1537 lle->la_flags |= LLE_STATIC; 1538 lle->r_flags |= (RLLE_VALID | RLLE_IFADDR); 1539 } 1540 1541 return (lle); 1542 } 1543 1544 /* 1545 * Return NULL if not found or marked for deletion. 1546 * If found return lle read locked. 1547 */ 1548 static struct llentry * 1549 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1550 { 1551 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1552 struct llentry *lle; 1553 1554 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 1555 KASSERT(l3addr->sa_family == AF_INET, 1556 ("sin_family %d", l3addr->sa_family)); 1557 KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) != 1558 (LLE_UNLOCKED | LLE_EXCLUSIVE), 1559 ("wrong lle request flags: %#x", flags)); 1560 1561 lle = in_lltable_find_dst(llt, sin->sin_addr); 1562 if (lle == NULL) 1563 return (NULL); 1564 if (flags & LLE_UNLOCKED) 1565 return (lle); 1566 1567 if (flags & LLE_EXCLUSIVE) 1568 LLE_WLOCK(lle); 1569 else 1570 LLE_RLOCK(lle); 1571 1572 /* 1573 * If the afdata lock is not held, the LLE may have been unlinked while 1574 * we were blocked on the LLE lock. Check for this case. 1575 */ 1576 if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) { 1577 if (flags & LLE_EXCLUSIVE) 1578 LLE_WUNLOCK(lle); 1579 else 1580 LLE_RUNLOCK(lle); 1581 return (NULL); 1582 } 1583 return (lle); 1584 } 1585 1586 static int 1587 in_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 1588 struct sysctl_req *wr) 1589 { 1590 struct ifnet *ifp = llt->llt_ifp; 1591 /* XXX stack use */ 1592 struct { 1593 struct rt_msghdr rtm; 1594 struct sockaddr_in sin; 1595 struct sockaddr_dl sdl; 1596 } arpc; 1597 struct sockaddr_dl *sdl; 1598 int error; 1599 1600 bzero(&arpc, sizeof(arpc)); 1601 /* skip deleted entries */ 1602 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 1603 return (0); 1604 /* Skip if jailed and not a valid IP of the prison. */ 1605 lltable_fill_sa_entry(lle,(struct sockaddr *)&arpc.sin); 1606 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&arpc.sin) != 0) 1607 return (0); 1608 /* 1609 * produce a msg made of: 1610 * struct rt_msghdr; 1611 * struct sockaddr_in; (IPv4) 1612 * struct sockaddr_dl; 1613 */ 1614 arpc.rtm.rtm_msglen = sizeof(arpc); 1615 arpc.rtm.rtm_version = RTM_VERSION; 1616 arpc.rtm.rtm_type = RTM_GET; 1617 arpc.rtm.rtm_flags = RTF_UP; 1618 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1619 1620 /* publish */ 1621 if (lle->la_flags & LLE_PUB) 1622 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1623 1624 sdl = &arpc.sdl; 1625 sdl->sdl_family = AF_LINK; 1626 sdl->sdl_len = sizeof(*sdl); 1627 sdl->sdl_index = ifp->if_index; 1628 sdl->sdl_type = ifp->if_type; 1629 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 1630 sdl->sdl_alen = ifp->if_addrlen; 1631 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1632 } else { 1633 sdl->sdl_alen = 0; 1634 bzero(LLADDR(sdl), ifp->if_addrlen); 1635 } 1636 1637 arpc.rtm.rtm_rmx.rmx_expire = 1638 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1639 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1640 if (lle->la_flags & LLE_STATIC) 1641 arpc.rtm.rtm_flags |= RTF_STATIC; 1642 if (lle->la_flags & LLE_IFADDR) 1643 arpc.rtm.rtm_flags |= RTF_PINNED; 1644 arpc.rtm.rtm_index = ifp->if_index; 1645 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1646 1647 return (error); 1648 } 1649 1650 static struct lltable * 1651 in_lltattach(struct ifnet *ifp) 1652 { 1653 struct lltable *llt; 1654 1655 llt = lltable_allocate_htbl(IN_LLTBL_DEFAULT_HSIZE); 1656 llt->llt_af = AF_INET; 1657 llt->llt_ifp = ifp; 1658 1659 llt->llt_lookup = in_lltable_lookup; 1660 llt->llt_alloc_entry = in_lltable_alloc; 1661 llt->llt_delete_entry = in_lltable_delete_entry; 1662 llt->llt_dump_entry = in_lltable_dump_entry; 1663 llt->llt_hash = in_lltable_hash; 1664 llt->llt_fill_sa_entry = in_lltable_fill_sa_entry; 1665 llt->llt_free_entry = in_lltable_free_entry; 1666 llt->llt_match_prefix = in_lltable_match_prefix; 1667 llt->llt_mark_used = in_lltable_mark_used; 1668 lltable_link(llt); 1669 1670 return (llt); 1671 } 1672 1673 void * 1674 in_domifattach(struct ifnet *ifp) 1675 { 1676 struct in_ifinfo *ii; 1677 1678 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); 1679 1680 ii->ii_llt = in_lltattach(ifp); 1681 ii->ii_igmp = igmp_domifattach(ifp); 1682 1683 return (ii); 1684 } 1685 1686 void 1687 in_domifdetach(struct ifnet *ifp, void *aux) 1688 { 1689 struct in_ifinfo *ii = (struct in_ifinfo *)aux; 1690 1691 igmp_domifdetach(ifp); 1692 lltable_free(ii->ii_llt); 1693 free(ii, M_IFADDR); 1694 } 1695