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 static VNET_DEFINE(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 TAILQ_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 IF_ADDR_RLOCK(ifp); 146 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 147 if (ifa->ifa_addr->sa_family != AF_INET) 148 continue; 149 ia = (struct in_ifaddr *)ifa; 150 if (ia->ia_addr.sin_addr.s_addr == in.s_addr) { 151 IF_ADDR_RUNLOCK(ifp); 152 return (1); 153 } 154 } 155 IF_ADDR_RUNLOCK(ifp); 156 157 return (0); 158 } 159 160 /* 161 * Return a reference to the interface address which is different to 162 * the supplied one but with same IP address value. 163 */ 164 static struct in_ifaddr * 165 in_localip_more(struct in_ifaddr *ia) 166 { 167 struct rm_priotracker in_ifa_tracker; 168 in_addr_t in = IA_SIN(ia)->sin_addr.s_addr; 169 struct in_ifaddr *it; 170 171 IN_IFADDR_RLOCK(&in_ifa_tracker); 172 LIST_FOREACH(it, INADDR_HASH(in), ia_hash) { 173 if (it != ia && IA_SIN(it)->sin_addr.s_addr == in) { 174 ifa_ref(&it->ia_ifa); 175 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 176 return (it); 177 } 178 } 179 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 180 181 return (NULL); 182 } 183 184 /* 185 * Determine whether an IP address is in a reserved set of addresses 186 * that may not be forwarded, or whether datagrams to that destination 187 * may be forwarded. 188 */ 189 int 190 in_canforward(struct in_addr in) 191 { 192 u_long i = ntohl(in.s_addr); 193 u_long net; 194 195 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i)) 196 return (0); 197 if (IN_CLASSA(i)) { 198 net = i & IN_CLASSA_NET; 199 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 200 return (0); 201 } 202 return (1); 203 } 204 205 /* 206 * Trim a mask in a sockaddr 207 */ 208 static void 209 in_socktrim(struct sockaddr_in *ap) 210 { 211 char *cplim = (char *) &ap->sin_addr; 212 char *cp = (char *) (&ap->sin_addr + 1); 213 214 ap->sin_len = 0; 215 while (--cp >= cplim) 216 if (*cp) { 217 (ap)->sin_len = cp - (char *) (ap) + 1; 218 break; 219 } 220 } 221 222 /* 223 * Generic internet control operations (ioctl's). 224 */ 225 int 226 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 227 struct thread *td) 228 { 229 struct ifreq *ifr = (struct ifreq *)data; 230 struct sockaddr_in *addr = (struct sockaddr_in *)&ifr->ifr_addr; 231 struct ifaddr *ifa; 232 struct in_ifaddr *ia; 233 int error; 234 235 if (ifp == NULL) 236 return (EADDRNOTAVAIL); 237 238 /* 239 * Filter out 4 ioctls we implement directly. Forward the rest 240 * to specific functions and ifp->if_ioctl(). 241 */ 242 switch (cmd) { 243 case SIOCGIFADDR: 244 case SIOCGIFBRDADDR: 245 case SIOCGIFDSTADDR: 246 case SIOCGIFNETMASK: 247 break; 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 IF_ADDR_RLOCK(ifp); 281 TAILQ_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 TAILQ_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 IF_ADDR_RUNLOCK(ifp); 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 IF_ADDR_RUNLOCK(ifp); 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 ifaddr *ifa; 344 struct in_ifaddr *ia; 345 bool iaIsFirst; 346 int error = 0; 347 348 error = priv_check(td, PRIV_NET_ADDIFADDR); 349 if (error) 350 return (error); 351 352 /* 353 * ifra_addr must be present and be of INET family. 354 * ifra_broadaddr/ifra_dstaddr and ifra_mask are optional. 355 */ 356 if (addr->sin_len != sizeof(struct sockaddr_in) || 357 addr->sin_family != AF_INET) 358 return (EINVAL); 359 if (broadaddr->sin_len != 0 && 360 (broadaddr->sin_len != sizeof(struct sockaddr_in) || 361 broadaddr->sin_family != AF_INET)) 362 return (EINVAL); 363 if (mask->sin_len != 0 && 364 (mask->sin_len != sizeof(struct sockaddr_in) || 365 mask->sin_family != AF_INET)) 366 return (EINVAL); 367 if ((ifp->if_flags & IFF_POINTOPOINT) && 368 (dstaddr->sin_len != sizeof(struct sockaddr_in) || 369 dstaddr->sin_addr.s_addr == INADDR_ANY)) 370 return (EDESTADDRREQ); 371 if (vhid > 0 && carp_attach_p == NULL) 372 return (EPROTONOSUPPORT); 373 374 /* 375 * See whether address already exist. 376 */ 377 iaIsFirst = true; 378 ia = NULL; 379 IF_ADDR_RLOCK(ifp); 380 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 381 struct in_ifaddr *it; 382 383 if (ifa->ifa_addr->sa_family != AF_INET) 384 continue; 385 386 it = (struct in_ifaddr *)ifa; 387 iaIsFirst = false; 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 } 392 IF_ADDR_RUNLOCK(ifp); 393 394 if (ia != NULL) 395 (void )in_difaddr_ioctl(cmd, data, ifp, td); 396 397 ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK); 398 ia = (struct in_ifaddr *)ifa; 399 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 400 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 401 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 402 callout_init_rw(&ia->ia_garp_timer, &ifp->if_addr_lock, 403 CALLOUT_RETURNUNLOCKED); 404 405 ia->ia_ifp = ifp; 406 ia->ia_addr = *addr; 407 if (mask->sin_len != 0) { 408 ia->ia_sockmask = *mask; 409 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 410 } else { 411 in_addr_t i = ntohl(addr->sin_addr.s_addr); 412 413 /* 414 * Be compatible with network classes, if netmask isn't 415 * supplied, guess it based on classes. 416 */ 417 if (IN_CLASSA(i)) 418 ia->ia_subnetmask = IN_CLASSA_NET; 419 else if (IN_CLASSB(i)) 420 ia->ia_subnetmask = IN_CLASSB_NET; 421 else 422 ia->ia_subnetmask = IN_CLASSC_NET; 423 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 424 } 425 ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask; 426 in_socktrim(&ia->ia_sockmask); 427 428 if (ifp->if_flags & IFF_BROADCAST) { 429 if (broadaddr->sin_len != 0) { 430 ia->ia_broadaddr = *broadaddr; 431 } else if (ia->ia_subnetmask == IN_RFC3021_MASK) { 432 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST; 433 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in); 434 ia->ia_broadaddr.sin_family = AF_INET; 435 } else { 436 ia->ia_broadaddr.sin_addr.s_addr = 437 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 438 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in); 439 ia->ia_broadaddr.sin_family = AF_INET; 440 } 441 } 442 443 if (ifp->if_flags & IFF_POINTOPOINT) 444 ia->ia_dstaddr = *dstaddr; 445 446 /* XXXGL: rtinit() needs this strange assignment. */ 447 if (ifp->if_flags & IFF_LOOPBACK) 448 ia->ia_dstaddr = ia->ia_addr; 449 450 if (vhid != 0) { 451 error = (*carp_attach_p)(&ia->ia_ifa, vhid); 452 if (error) 453 return (error); 454 } 455 456 /* if_addrhead is already referenced by ifa_alloc() */ 457 IF_ADDR_WLOCK(ifp); 458 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 459 IF_ADDR_WUNLOCK(ifp); 460 461 ifa_ref(ifa); /* in_ifaddrhead */ 462 IN_IFADDR_WLOCK(); 463 TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link); 464 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 465 IN_IFADDR_WUNLOCK(); 466 467 /* 468 * Give the interface a chance to initialize 469 * if this is its first address, 470 * and to validate the address if necessary. 471 */ 472 if (ifp->if_ioctl != NULL) { 473 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 474 if (error) 475 goto fail1; 476 } 477 478 /* 479 * Add route for the network. 480 */ 481 if (vhid == 0) { 482 int flags = RTF_UP; 483 484 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) 485 flags |= RTF_HOST; 486 487 error = in_addprefix(ia, flags); 488 if (error) 489 goto fail1; 490 } 491 492 /* 493 * Add a loopback route to self. 494 */ 495 if (vhid == 0 && (ifp->if_flags & IFF_LOOPBACK) == 0 && 496 ia->ia_addr.sin_addr.s_addr != INADDR_ANY && 497 !((ifp->if_flags & IFF_POINTOPOINT) && 498 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)) { 499 struct in_ifaddr *eia; 500 501 eia = in_localip_more(ia); 502 503 if (eia == NULL) { 504 error = ifa_add_loopback_route((struct ifaddr *)ia, 505 (struct sockaddr *)&ia->ia_addr); 506 if (error) 507 goto fail2; 508 } else 509 ifa_free(&eia->ia_ifa); 510 } 511 512 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST)) { 513 struct in_addr allhosts_addr; 514 struct in_ifinfo *ii; 515 516 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 517 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 518 519 error = in_joingroup(ifp, &allhosts_addr, NULL, 520 &ii->ii_allhosts); 521 } 522 523 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 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 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 537 IF_ADDR_WUNLOCK(ifp); 538 ifa_free(&ia->ia_ifa); /* if_addrhead */ 539 540 IN_IFADDR_WLOCK(); 541 TAILQ_REMOVE(&V_in_ifaddrhead, ia, 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 TAILQ_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 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 601 IF_ADDR_WUNLOCK(ifp); 602 ifa_free(&ia->ia_ifa); /* if_addrhead */ 603 604 IN_IFADDR_WLOCK(); 605 TAILQ_REMOVE(&V_in_ifaddrhead, ia, 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, 624 (cmd == SIOCDIFADDR) ? false : true); 625 626 /* 627 * If this is the last IPv4 address configured on this 628 * interface, leave the all-hosts group. 629 * No state-change report need be transmitted. 630 */ 631 if (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) { 632 struct in_ifinfo *ii; 633 634 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 635 IN_MULTI_LOCK(); 636 if (ii->ii_allhosts) { 637 (void)in_leavegroup_locked(ii->ii_allhosts, NULL); 638 ii->ii_allhosts = NULL; 639 } 640 IN_MULTI_UNLOCK(); 641 } 642 643 IF_ADDR_WLOCK(ifp); 644 if (callout_stop(&ia->ia_garp_timer) == 1) { 645 ifa_free(&ia->ia_ifa); 646 } 647 IF_ADDR_WUNLOCK(ifp); 648 649 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 650 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 651 652 return (0); 653 } 654 655 #define rtinitflags(x) \ 656 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 657 ? RTF_HOST : 0) 658 659 /* 660 * Check if we have a route for the given prefix already or add one accordingly. 661 */ 662 int 663 in_addprefix(struct in_ifaddr *target, int flags) 664 { 665 struct rm_priotracker in_ifa_tracker; 666 struct in_ifaddr *ia; 667 struct in_addr prefix, mask, p, m; 668 int error; 669 670 if ((flags & RTF_HOST) != 0) { 671 prefix = target->ia_dstaddr.sin_addr; 672 mask.s_addr = 0; 673 } else { 674 prefix = target->ia_addr.sin_addr; 675 mask = target->ia_sockmask.sin_addr; 676 prefix.s_addr &= mask.s_addr; 677 } 678 679 IN_IFADDR_RLOCK(&in_ifa_tracker); 680 /* Look for an existing address with the same prefix, mask, and fib */ 681 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 682 if (rtinitflags(ia)) { 683 p = ia->ia_dstaddr.sin_addr; 684 685 if (prefix.s_addr != p.s_addr) 686 continue; 687 } else { 688 p = ia->ia_addr.sin_addr; 689 m = ia->ia_sockmask.sin_addr; 690 p.s_addr &= m.s_addr; 691 692 if (prefix.s_addr != p.s_addr || 693 mask.s_addr != m.s_addr) 694 continue; 695 } 696 if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib) 697 continue; 698 699 /* 700 * If we got a matching prefix route inserted by other 701 * interface address, we are done here. 702 */ 703 if (ia->ia_flags & IFA_ROUTE) { 704 #ifdef RADIX_MPATH 705 if (ia->ia_addr.sin_addr.s_addr == 706 target->ia_addr.sin_addr.s_addr) { 707 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 708 return (EEXIST); 709 } else 710 break; 711 #endif 712 if (V_nosameprefix) { 713 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 714 return (EEXIST); 715 } else { 716 int fibnum; 717 718 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS : 719 target->ia_ifp->if_fib; 720 rt_addrmsg(RTM_ADD, &target->ia_ifa, fibnum); 721 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 722 return (0); 723 } 724 } 725 } 726 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 727 728 /* 729 * No-one seem to have this prefix route, so we try to insert it. 730 */ 731 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 732 if (!error) 733 target->ia_flags |= IFA_ROUTE; 734 return (error); 735 } 736 737 /* 738 * Removes either all lle entries for given @ia, or lle 739 * corresponding to @ia address. 740 */ 741 static void 742 in_scrubprefixlle(struct in_ifaddr *ia, int all, u_int flags) 743 { 744 struct sockaddr_in addr, mask; 745 struct sockaddr *saddr, *smask; 746 struct ifnet *ifp; 747 748 saddr = (struct sockaddr *)&addr; 749 bzero(&addr, sizeof(addr)); 750 addr.sin_len = sizeof(addr); 751 addr.sin_family = AF_INET; 752 smask = (struct sockaddr *)&mask; 753 bzero(&mask, sizeof(mask)); 754 mask.sin_len = sizeof(mask); 755 mask.sin_family = AF_INET; 756 mask.sin_addr.s_addr = ia->ia_subnetmask; 757 ifp = ia->ia_ifp; 758 759 if (all) { 760 761 /* 762 * Remove all L2 entries matching given prefix. 763 * Convert address to host representation to avoid 764 * doing this on every callback. ia_subnetmask is already 765 * stored in host representation. 766 */ 767 addr.sin_addr.s_addr = ntohl(ia->ia_addr.sin_addr.s_addr); 768 lltable_prefix_free(AF_INET, saddr, smask, flags); 769 } else { 770 /* Remove interface address only */ 771 addr.sin_addr.s_addr = ia->ia_addr.sin_addr.s_addr; 772 lltable_delete_addr(LLTABLE(ifp), LLE_IFADDR, saddr); 773 } 774 } 775 776 /* 777 * If there is no other address in the system that can serve a route to the 778 * same prefix, remove the route. Hand over the route to the new address 779 * otherwise. 780 */ 781 int 782 in_scrubprefix(struct in_ifaddr *target, u_int flags) 783 { 784 struct rm_priotracker in_ifa_tracker; 785 struct in_ifaddr *ia; 786 struct in_addr prefix, mask, p, m; 787 int error = 0; 788 789 /* 790 * Remove the loopback route to the interface address. 791 */ 792 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) && 793 !(target->ia_ifp->if_flags & IFF_LOOPBACK) && 794 (flags & LLE_STATIC)) { 795 struct in_ifaddr *eia; 796 797 /* 798 * XXXME: add fib-aware in_localip. 799 * We definitely don't want to switch between 800 * prefixes in different fibs. 801 */ 802 eia = in_localip_more(target); 803 804 if (eia != NULL) { 805 error = ifa_switch_loopback_route((struct ifaddr *)eia, 806 (struct sockaddr *)&target->ia_addr); 807 ifa_free(&eia->ia_ifa); 808 } else { 809 error = ifa_del_loopback_route((struct ifaddr *)target, 810 (struct sockaddr *)&target->ia_addr); 811 } 812 } 813 814 if (rtinitflags(target)) { 815 prefix = target->ia_dstaddr.sin_addr; 816 mask.s_addr = 0; 817 } else { 818 prefix = target->ia_addr.sin_addr; 819 mask = target->ia_sockmask.sin_addr; 820 prefix.s_addr &= mask.s_addr; 821 } 822 823 if ((target->ia_flags & IFA_ROUTE) == 0) { 824 int fibnum; 825 826 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS : 827 target->ia_ifp->if_fib; 828 rt_addrmsg(RTM_DELETE, &target->ia_ifa, fibnum); 829 830 /* 831 * Removing address from !IFF_UP interface or 832 * prefix which exists on other interface (along with route). 833 * No entries should exist here except target addr. 834 * Given that, delete this entry only. 835 */ 836 in_scrubprefixlle(target, 0, flags); 837 return (0); 838 } 839 840 IN_IFADDR_RLOCK(&in_ifa_tracker); 841 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 842 if (rtinitflags(ia)) { 843 p = ia->ia_dstaddr.sin_addr; 844 845 if (prefix.s_addr != p.s_addr) 846 continue; 847 } else { 848 p = ia->ia_addr.sin_addr; 849 m = ia->ia_sockmask.sin_addr; 850 p.s_addr &= m.s_addr; 851 852 if (prefix.s_addr != p.s_addr || 853 mask.s_addr != m.s_addr) 854 continue; 855 } 856 857 if ((ia->ia_ifp->if_flags & IFF_UP) == 0) 858 continue; 859 860 /* 861 * If we got a matching prefix address, move IFA_ROUTE and 862 * the route itself to it. Make sure that routing daemons 863 * get a heads-up. 864 */ 865 if ((ia->ia_flags & IFA_ROUTE) == 0) { 866 ifa_ref(&ia->ia_ifa); 867 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 868 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, 869 rtinitflags(target)); 870 if (error == 0) 871 target->ia_flags &= ~IFA_ROUTE; 872 else 873 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n", 874 error); 875 /* Scrub all entries IFF interface is different */ 876 in_scrubprefixlle(target, target->ia_ifp != ia->ia_ifp, 877 flags); 878 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 879 rtinitflags(ia) | RTF_UP); 880 if (error == 0) 881 ia->ia_flags |= IFA_ROUTE; 882 else 883 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n", 884 error); 885 ifa_free(&ia->ia_ifa); 886 return (error); 887 } 888 } 889 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 890 891 /* 892 * remove all L2 entries on the given prefix 893 */ 894 in_scrubprefixlle(target, 1, flags); 895 896 /* 897 * As no-one seem to have this prefix, we can remove the route. 898 */ 899 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 900 if (error == 0) 901 target->ia_flags &= ~IFA_ROUTE; 902 else 903 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error); 904 return (error); 905 } 906 907 #undef rtinitflags 908 909 void 910 in_ifscrub_all(void) 911 { 912 struct ifnet *ifp; 913 struct ifaddr *ifa, *nifa; 914 struct ifaliasreq ifr; 915 916 IFNET_RLOCK(); 917 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 918 /* Cannot lock here - lock recursion. */ 919 /* IF_ADDR_RLOCK(ifp); */ 920 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) { 921 if (ifa->ifa_addr->sa_family != AF_INET) 922 continue; 923 924 /* 925 * This is ugly but the only way for legacy IP to 926 * cleanly remove addresses and everything attached. 927 */ 928 bzero(&ifr, sizeof(ifr)); 929 ifr.ifra_addr = *ifa->ifa_addr; 930 if (ifa->ifa_dstaddr) 931 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 932 (void)in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, 933 ifp, NULL); 934 } 935 /* IF_ADDR_RUNLOCK(ifp); */ 936 in_purgemaddrs(ifp); 937 igmp_domifdetach(ifp); 938 } 939 IFNET_RUNLOCK(); 940 } 941 942 int 943 in_ifaddr_broadcast(struct in_addr in, struct in_ifaddr *ia) 944 { 945 946 return ((in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 947 /* 948 * Check for old-style (host 0) broadcast, but 949 * taking into account that RFC 3021 obsoletes it. 950 */ 951 (ia->ia_subnetmask != IN_RFC3021_MASK && 952 ntohl(in.s_addr) == ia->ia_subnet)) && 953 /* 954 * Check for an all one subnetmask. These 955 * only exist when an interface gets a secondary 956 * address. 957 */ 958 ia->ia_subnetmask != (u_long)0xffffffff); 959 } 960 961 /* 962 * Return 1 if the address might be a local broadcast address. 963 */ 964 int 965 in_broadcast(struct in_addr in, struct ifnet *ifp) 966 { 967 struct ifaddr *ifa; 968 int found; 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 IF_ADDR_RLOCK(ifp); 981 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 982 if (ifa->ifa_addr->sa_family == AF_INET && 983 in_ifaddr_broadcast(in, (struct in_ifaddr *)ifa)) { 984 found = 1; 985 break; 986 } 987 IF_ADDR_RUNLOCK(ifp); 988 return (found); 989 } 990 991 /* 992 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 993 */ 994 void 995 in_ifdetach(struct ifnet *ifp) 996 { 997 998 in_pcbpurgeif0(&V_ripcbinfo, ifp); 999 in_pcbpurgeif0(&V_udbinfo, ifp); 1000 in_pcbpurgeif0(&V_ulitecbinfo, ifp); 1001 in_purgemaddrs(ifp); 1002 } 1003 1004 /* 1005 * Delete all IPv4 multicast address records, and associated link-layer 1006 * multicast address records, associated with ifp. 1007 * XXX It looks like domifdetach runs AFTER the link layer cleanup. 1008 * XXX This should not race with ifma_protospec being set during 1009 * a new allocation, if it does, we have bigger problems. 1010 */ 1011 static void 1012 in_purgemaddrs(struct ifnet *ifp) 1013 { 1014 LIST_HEAD(,in_multi) purgeinms; 1015 struct in_multi *inm, *tinm; 1016 struct ifmultiaddr *ifma; 1017 1018 LIST_INIT(&purgeinms); 1019 IN_MULTI_LOCK(); 1020 1021 /* 1022 * Extract list of in_multi associated with the detaching ifp 1023 * which the PF_INET layer is about to release. 1024 * We need to do this as IF_ADDR_LOCK() may be re-acquired 1025 * by code further down. 1026 */ 1027 IF_ADDR_RLOCK(ifp); 1028 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1029 if (ifma->ifma_addr->sa_family != AF_INET || 1030 ifma->ifma_protospec == NULL) 1031 continue; 1032 #if 0 1033 KASSERT(ifma->ifma_protospec != NULL, 1034 ("%s: ifma_protospec is NULL", __func__)); 1035 #endif 1036 inm = (struct in_multi *)ifma->ifma_protospec; 1037 LIST_INSERT_HEAD(&purgeinms, inm, inm_link); 1038 } 1039 IF_ADDR_RUNLOCK(ifp); 1040 1041 LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) { 1042 LIST_REMOVE(inm, inm_link); 1043 inm_release_locked(inm); 1044 } 1045 igmp_ifdetach(ifp); 1046 1047 IN_MULTI_UNLOCK(); 1048 } 1049 1050 struct in_llentry { 1051 struct llentry base; 1052 }; 1053 1054 #define IN_LLTBL_DEFAULT_HSIZE 32 1055 #define IN_LLTBL_HASH(k, h) \ 1056 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 1057 1058 /* 1059 * Do actual deallocation of @lle. 1060 */ 1061 static void 1062 in_lltable_destroy_lle_unlocked(struct llentry *lle) 1063 { 1064 1065 LLE_LOCK_DESTROY(lle); 1066 LLE_REQ_DESTROY(lle); 1067 free(lle, M_LLTABLE); 1068 } 1069 1070 /* 1071 * Called by LLE_FREE_LOCKED when number of references 1072 * drops to zero. 1073 */ 1074 static void 1075 in_lltable_destroy_lle(struct llentry *lle) 1076 { 1077 1078 LLE_WUNLOCK(lle); 1079 in_lltable_destroy_lle_unlocked(lle); 1080 } 1081 1082 static struct llentry * 1083 in_lltable_new(struct in_addr addr4, u_int flags) 1084 { 1085 struct in_llentry *lle; 1086 1087 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 1088 if (lle == NULL) /* NB: caller generates msg */ 1089 return NULL; 1090 1091 /* 1092 * For IPv4 this will trigger "arpresolve" to generate 1093 * an ARP request. 1094 */ 1095 lle->base.la_expire = time_uptime; /* mark expired */ 1096 lle->base.r_l3addr.addr4 = addr4; 1097 lle->base.lle_refcnt = 1; 1098 lle->base.lle_free = in_lltable_destroy_lle; 1099 LLE_LOCK_INIT(&lle->base); 1100 LLE_REQ_INIT(&lle->base); 1101 callout_init(&lle->base.lle_timer, 1); 1102 1103 return (&lle->base); 1104 } 1105 1106 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 1107 ((((d).s_addr ^ (a).s_addr) & (m).s_addr)) == 0 ) 1108 1109 static int 1110 in_lltable_match_prefix(const struct sockaddr *saddr, 1111 const struct sockaddr *smask, u_int flags, struct llentry *lle) 1112 { 1113 struct in_addr addr, mask, lle_addr; 1114 1115 addr = ((const struct sockaddr_in *)saddr)->sin_addr; 1116 mask = ((const struct sockaddr_in *)smask)->sin_addr; 1117 lle_addr.s_addr = ntohl(lle->r_l3addr.addr4.s_addr); 1118 1119 if (IN_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0) 1120 return (0); 1121 1122 if (lle->la_flags & LLE_IFADDR) { 1123 1124 /* 1125 * Delete LLE_IFADDR records IFF address & flag matches. 1126 * Note that addr is the interface address within prefix 1127 * being matched. 1128 * Note also we should handle 'ifdown' cases without removing 1129 * ifaddr macs. 1130 */ 1131 if (addr.s_addr == lle_addr.s_addr && (flags & LLE_STATIC) != 0) 1132 return (1); 1133 return (0); 1134 } 1135 1136 /* flags & LLE_STATIC means deleting both dynamic and static entries */ 1137 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC)) 1138 return (1); 1139 1140 return (0); 1141 } 1142 1143 static void 1144 in_lltable_free_entry(struct lltable *llt, struct llentry *lle) 1145 { 1146 struct ifnet *ifp; 1147 size_t pkts_dropped; 1148 1149 LLE_WLOCK_ASSERT(lle); 1150 KASSERT(llt != NULL, ("lltable is NULL")); 1151 1152 /* Unlink entry from table if not already */ 1153 if ((lle->la_flags & LLE_LINKED) != 0) { 1154 ifp = llt->llt_ifp; 1155 IF_AFDATA_WLOCK_ASSERT(ifp); 1156 lltable_unlink_entry(llt, lle); 1157 } 1158 1159 /* cancel timer */ 1160 if (callout_stop(&lle->lle_timer) > 0) 1161 LLE_REMREF(lle); 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 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 in_lltable_destroy_lle_unlocked(lle); 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 lle = in_lltable_find_dst(llt, sin->sin_addr); 1372 1373 if (lle == NULL) 1374 return (NULL); 1375 1376 KASSERT((flags & (LLE_UNLOCKED|LLE_EXCLUSIVE)) != 1377 (LLE_UNLOCKED|LLE_EXCLUSIVE),("wrong lle request flags: 0x%X", 1378 flags)); 1379 1380 if (flags & LLE_UNLOCKED) 1381 return (lle); 1382 1383 if (flags & LLE_EXCLUSIVE) 1384 LLE_WLOCK(lle); 1385 else 1386 LLE_RLOCK(lle); 1387 1388 return (lle); 1389 } 1390 1391 static int 1392 in_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 1393 struct sysctl_req *wr) 1394 { 1395 struct ifnet *ifp = llt->llt_ifp; 1396 /* XXX stack use */ 1397 struct { 1398 struct rt_msghdr rtm; 1399 struct sockaddr_in sin; 1400 struct sockaddr_dl sdl; 1401 } arpc; 1402 struct sockaddr_dl *sdl; 1403 int error; 1404 1405 bzero(&arpc, sizeof(arpc)); 1406 /* skip deleted entries */ 1407 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 1408 return (0); 1409 /* Skip if jailed and not a valid IP of the prison. */ 1410 lltable_fill_sa_entry(lle,(struct sockaddr *)&arpc.sin); 1411 if (prison_if(wr->td->td_ucred, 1412 (struct sockaddr *)&arpc.sin) != 0) 1413 return (0); 1414 /* 1415 * produce a msg made of: 1416 * struct rt_msghdr; 1417 * struct sockaddr_in; (IPv4) 1418 * struct sockaddr_dl; 1419 */ 1420 arpc.rtm.rtm_msglen = sizeof(arpc); 1421 arpc.rtm.rtm_version = RTM_VERSION; 1422 arpc.rtm.rtm_type = RTM_GET; 1423 arpc.rtm.rtm_flags = RTF_UP; 1424 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1425 1426 /* publish */ 1427 if (lle->la_flags & LLE_PUB) 1428 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1429 1430 sdl = &arpc.sdl; 1431 sdl->sdl_family = AF_LINK; 1432 sdl->sdl_len = sizeof(*sdl); 1433 sdl->sdl_index = ifp->if_index; 1434 sdl->sdl_type = ifp->if_type; 1435 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 1436 sdl->sdl_alen = ifp->if_addrlen; 1437 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1438 } else { 1439 sdl->sdl_alen = 0; 1440 bzero(LLADDR(sdl), ifp->if_addrlen); 1441 } 1442 1443 arpc.rtm.rtm_rmx.rmx_expire = 1444 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1445 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1446 if (lle->la_flags & LLE_STATIC) 1447 arpc.rtm.rtm_flags |= RTF_STATIC; 1448 if (lle->la_flags & LLE_IFADDR) 1449 arpc.rtm.rtm_flags |= RTF_PINNED; 1450 arpc.rtm.rtm_index = ifp->if_index; 1451 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1452 1453 return (error); 1454 } 1455 1456 static struct lltable * 1457 in_lltattach(struct ifnet *ifp) 1458 { 1459 struct lltable *llt; 1460 1461 llt = lltable_allocate_htbl(IN_LLTBL_DEFAULT_HSIZE); 1462 llt->llt_af = AF_INET; 1463 llt->llt_ifp = ifp; 1464 1465 llt->llt_lookup = in_lltable_lookup; 1466 llt->llt_alloc_entry = in_lltable_alloc; 1467 llt->llt_delete_entry = in_lltable_delete_entry; 1468 llt->llt_dump_entry = in_lltable_dump_entry; 1469 llt->llt_hash = in_lltable_hash; 1470 llt->llt_fill_sa_entry = in_lltable_fill_sa_entry; 1471 llt->llt_free_entry = in_lltable_free_entry; 1472 llt->llt_match_prefix = in_lltable_match_prefix; 1473 lltable_link(llt); 1474 1475 return (llt); 1476 } 1477 1478 void * 1479 in_domifattach(struct ifnet *ifp) 1480 { 1481 struct in_ifinfo *ii; 1482 1483 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); 1484 1485 ii->ii_llt = in_lltattach(ifp); 1486 ii->ii_igmp = igmp_domifattach(ifp); 1487 1488 return (ii); 1489 } 1490 1491 void 1492 in_domifdetach(struct ifnet *ifp, void *aux) 1493 { 1494 struct in_ifinfo *ii = (struct in_ifinfo *)aux; 1495 1496 igmp_domifdetach(ifp); 1497 lltable_free(ii->ii_llt); 1498 free(ii, M_IFADDR); 1499 } 1500