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 IF_ADDR_RLOCK(ifp); 146 CK_STAILQ_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 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 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 CK_STAILQ_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 CK_STAILQ_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 CK_STAILQ_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 /* 524 * Note: we don't need extra reference for ifa, since we called 525 * with sx lock held, and ifaddr can not be deleted in concurrent 526 * thread. 527 */ 528 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, ifa, IFADDR_EVENT_ADD); 529 530 return (error); 531 532 fail2: 533 if (vhid == 0) 534 (void )in_scrubprefix(ia, LLE_STATIC); 535 536 fail1: 537 if (ia->ia_ifa.ifa_carp) 538 (*carp_detach_p)(&ia->ia_ifa, false); 539 540 IF_ADDR_WLOCK(ifp); 541 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link); 542 IF_ADDR_WUNLOCK(ifp); 543 ifa_free(&ia->ia_ifa); /* if_addrhead */ 544 545 IN_IFADDR_WLOCK(); 546 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link); 547 LIST_REMOVE(ia, ia_hash); 548 IN_IFADDR_WUNLOCK(); 549 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 550 551 return (error); 552 } 553 554 static int 555 in_difaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td) 556 { 557 const struct ifreq *ifr = (struct ifreq *)data; 558 const struct sockaddr_in *addr = (const struct sockaddr_in *) 559 &ifr->ifr_addr; 560 struct ifaddr *ifa; 561 struct in_ifaddr *ia; 562 bool deleteAny, iaIsLast; 563 int error; 564 565 if (td != NULL) { 566 error = priv_check(td, PRIV_NET_DELIFADDR); 567 if (error) 568 return (error); 569 } 570 571 if (addr->sin_len != sizeof(struct sockaddr_in) || 572 addr->sin_family != AF_INET) 573 deleteAny = true; 574 else 575 deleteAny = false; 576 577 iaIsLast = true; 578 ia = NULL; 579 IF_ADDR_WLOCK(ifp); 580 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 581 struct in_ifaddr *it; 582 583 if (ifa->ifa_addr->sa_family != AF_INET) 584 continue; 585 586 it = (struct in_ifaddr *)ifa; 587 if (deleteAny && ia == NULL && (td == NULL || 588 prison_check_ip4(td->td_ucred, &it->ia_addr.sin_addr) == 0)) 589 ia = it; 590 591 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr && 592 (td == NULL || prison_check_ip4(td->td_ucred, 593 &addr->sin_addr) == 0)) 594 ia = it; 595 596 if (it != ia) 597 iaIsLast = false; 598 } 599 600 if (ia == NULL) { 601 IF_ADDR_WUNLOCK(ifp); 602 return (EADDRNOTAVAIL); 603 } 604 605 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link); 606 IF_ADDR_WUNLOCK(ifp); 607 ifa_free(&ia->ia_ifa); /* if_addrhead */ 608 609 IN_IFADDR_WLOCK(); 610 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link); 611 LIST_REMOVE(ia, ia_hash); 612 IN_IFADDR_WUNLOCK(); 613 614 /* 615 * in_scrubprefix() kills the interface route. 616 */ 617 in_scrubprefix(ia, LLE_STATIC); 618 619 /* 620 * in_ifadown gets rid of all the rest of 621 * the routes. This is not quite the right 622 * thing to do, but at least if we are running 623 * a routing process they will come back. 624 */ 625 in_ifadown(&ia->ia_ifa, 1); 626 627 if (ia->ia_ifa.ifa_carp) 628 (*carp_detach_p)(&ia->ia_ifa, cmd == SIOCAIFADDR); 629 630 /* 631 * If this is the last IPv4 address configured on this 632 * interface, leave the all-hosts group. 633 * No state-change report need be transmitted. 634 */ 635 if (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) { 636 struct in_ifinfo *ii; 637 638 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 639 if (ii->ii_allhosts) { 640 (void)in_leavegroup(ii->ii_allhosts, NULL); 641 ii->ii_allhosts = NULL; 642 } 643 } 644 645 IF_ADDR_WLOCK(ifp); 646 if (callout_stop(&ia->ia_garp_timer) == 1) { 647 ifa_free(&ia->ia_ifa); 648 } 649 IF_ADDR_WUNLOCK(ifp); 650 651 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa, 652 IFADDR_EVENT_DEL); 653 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 654 655 return (0); 656 } 657 658 #define rtinitflags(x) \ 659 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 660 ? RTF_HOST : 0) 661 662 /* 663 * Check if we have a route for the given prefix already or add one accordingly. 664 */ 665 int 666 in_addprefix(struct in_ifaddr *target, int flags) 667 { 668 struct rm_priotracker in_ifa_tracker; 669 struct in_ifaddr *ia; 670 struct in_addr prefix, mask, p, m; 671 int error; 672 673 if ((flags & RTF_HOST) != 0) { 674 prefix = target->ia_dstaddr.sin_addr; 675 mask.s_addr = 0; 676 } else { 677 prefix = target->ia_addr.sin_addr; 678 mask = target->ia_sockmask.sin_addr; 679 prefix.s_addr &= mask.s_addr; 680 } 681 682 IN_IFADDR_RLOCK(&in_ifa_tracker); 683 /* Look for an existing address with the same prefix, mask, and fib */ 684 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 685 if (rtinitflags(ia)) { 686 p = ia->ia_dstaddr.sin_addr; 687 688 if (prefix.s_addr != p.s_addr) 689 continue; 690 } else { 691 p = ia->ia_addr.sin_addr; 692 m = ia->ia_sockmask.sin_addr; 693 p.s_addr &= m.s_addr; 694 695 if (prefix.s_addr != p.s_addr || 696 mask.s_addr != m.s_addr) 697 continue; 698 } 699 if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib) 700 continue; 701 702 /* 703 * If we got a matching prefix route inserted by other 704 * interface address, we are done here. 705 */ 706 if (ia->ia_flags & IFA_ROUTE) { 707 #ifdef RADIX_MPATH 708 if (ia->ia_addr.sin_addr.s_addr == 709 target->ia_addr.sin_addr.s_addr) { 710 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 711 return (EEXIST); 712 } else 713 break; 714 #endif 715 if (V_nosameprefix) { 716 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 717 return (EEXIST); 718 } else { 719 int fibnum; 720 721 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS : 722 target->ia_ifp->if_fib; 723 rt_addrmsg(RTM_ADD, &target->ia_ifa, fibnum); 724 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 725 return (0); 726 } 727 } 728 } 729 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 730 731 /* 732 * No-one seem to have this prefix route, so we try to insert it. 733 */ 734 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 735 if (!error) 736 target->ia_flags |= IFA_ROUTE; 737 return (error); 738 } 739 740 /* 741 * Removes either all lle entries for given @ia, or lle 742 * corresponding to @ia address. 743 */ 744 static void 745 in_scrubprefixlle(struct in_ifaddr *ia, int all, u_int flags) 746 { 747 struct sockaddr_in addr, mask; 748 struct sockaddr *saddr, *smask; 749 struct ifnet *ifp; 750 751 saddr = (struct sockaddr *)&addr; 752 bzero(&addr, sizeof(addr)); 753 addr.sin_len = sizeof(addr); 754 addr.sin_family = AF_INET; 755 smask = (struct sockaddr *)&mask; 756 bzero(&mask, sizeof(mask)); 757 mask.sin_len = sizeof(mask); 758 mask.sin_family = AF_INET; 759 mask.sin_addr.s_addr = ia->ia_subnetmask; 760 ifp = ia->ia_ifp; 761 762 if (all) { 763 764 /* 765 * Remove all L2 entries matching given prefix. 766 * Convert address to host representation to avoid 767 * doing this on every callback. ia_subnetmask is already 768 * stored in host representation. 769 */ 770 addr.sin_addr.s_addr = ntohl(ia->ia_addr.sin_addr.s_addr); 771 lltable_prefix_free(AF_INET, saddr, smask, flags); 772 } else { 773 /* Remove interface address only */ 774 addr.sin_addr.s_addr = ia->ia_addr.sin_addr.s_addr; 775 lltable_delete_addr(LLTABLE(ifp), LLE_IFADDR, saddr); 776 } 777 } 778 779 /* 780 * If there is no other address in the system that can serve a route to the 781 * same prefix, remove the route. Hand over the route to the new address 782 * otherwise. 783 */ 784 int 785 in_scrubprefix(struct in_ifaddr *target, u_int flags) 786 { 787 struct rm_priotracker in_ifa_tracker; 788 struct in_ifaddr *ia; 789 struct in_addr prefix, mask, p, m; 790 int error = 0; 791 792 /* 793 * Remove the loopback route to the interface address. 794 */ 795 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) && 796 !(target->ia_ifp->if_flags & IFF_LOOPBACK) && 797 (flags & LLE_STATIC)) { 798 struct in_ifaddr *eia; 799 800 /* 801 * XXXME: add fib-aware in_localip. 802 * We definitely don't want to switch between 803 * prefixes in different fibs. 804 */ 805 eia = in_localip_more(target); 806 807 if (eia != NULL) { 808 error = ifa_switch_loopback_route((struct ifaddr *)eia, 809 (struct sockaddr *)&target->ia_addr); 810 ifa_free(&eia->ia_ifa); 811 } else { 812 error = ifa_del_loopback_route((struct ifaddr *)target, 813 (struct sockaddr *)&target->ia_addr); 814 } 815 } 816 817 if (rtinitflags(target)) { 818 prefix = target->ia_dstaddr.sin_addr; 819 mask.s_addr = 0; 820 } else { 821 prefix = target->ia_addr.sin_addr; 822 mask = target->ia_sockmask.sin_addr; 823 prefix.s_addr &= mask.s_addr; 824 } 825 826 if ((target->ia_flags & IFA_ROUTE) == 0) { 827 int fibnum; 828 829 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS : 830 target->ia_ifp->if_fib; 831 rt_addrmsg(RTM_DELETE, &target->ia_ifa, fibnum); 832 833 /* 834 * Removing address from !IFF_UP interface or 835 * prefix which exists on other interface (along with route). 836 * No entries should exist here except target addr. 837 * Given that, delete this entry only. 838 */ 839 in_scrubprefixlle(target, 0, flags); 840 return (0); 841 } 842 843 IN_IFADDR_RLOCK(&in_ifa_tracker); 844 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 845 if (rtinitflags(ia)) { 846 p = ia->ia_dstaddr.sin_addr; 847 848 if (prefix.s_addr != p.s_addr) 849 continue; 850 } else { 851 p = ia->ia_addr.sin_addr; 852 m = ia->ia_sockmask.sin_addr; 853 p.s_addr &= m.s_addr; 854 855 if (prefix.s_addr != p.s_addr || 856 mask.s_addr != m.s_addr) 857 continue; 858 } 859 860 if ((ia->ia_ifp->if_flags & IFF_UP) == 0) 861 continue; 862 863 /* 864 * If we got a matching prefix address, move IFA_ROUTE and 865 * the route itself to it. Make sure that routing daemons 866 * get a heads-up. 867 */ 868 if ((ia->ia_flags & IFA_ROUTE) == 0) { 869 ifa_ref(&ia->ia_ifa); 870 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 871 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, 872 rtinitflags(target)); 873 if (error == 0) 874 target->ia_flags &= ~IFA_ROUTE; 875 else 876 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n", 877 error); 878 /* Scrub all entries IFF interface is different */ 879 in_scrubprefixlle(target, target->ia_ifp != ia->ia_ifp, 880 flags); 881 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 882 rtinitflags(ia) | RTF_UP); 883 if (error == 0) 884 ia->ia_flags |= IFA_ROUTE; 885 else 886 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n", 887 error); 888 ifa_free(&ia->ia_ifa); 889 return (error); 890 } 891 } 892 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 893 894 /* 895 * remove all L2 entries on the given prefix 896 */ 897 in_scrubprefixlle(target, 1, flags); 898 899 /* 900 * As no-one seem to have this prefix, we can remove the route. 901 */ 902 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 903 if (error == 0) 904 target->ia_flags &= ~IFA_ROUTE; 905 else 906 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error); 907 return (error); 908 } 909 910 #undef rtinitflags 911 912 void 913 in_ifscrub_all(void) 914 { 915 struct ifnet *ifp; 916 struct ifaddr *ifa, *nifa; 917 struct ifaliasreq ifr; 918 919 IFNET_RLOCK(); 920 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 921 /* Cannot lock here - lock recursion. */ 922 /* IF_ADDR_RLOCK(ifp); */ 923 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) { 924 if (ifa->ifa_addr->sa_family != AF_INET) 925 continue; 926 927 /* 928 * This is ugly but the only way for legacy IP to 929 * cleanly remove addresses and everything attached. 930 */ 931 bzero(&ifr, sizeof(ifr)); 932 ifr.ifra_addr = *ifa->ifa_addr; 933 if (ifa->ifa_dstaddr) 934 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 935 (void)in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, 936 ifp, NULL); 937 } 938 /* IF_ADDR_RUNLOCK(ifp); */ 939 in_purgemaddrs(ifp); 940 igmp_domifdetach(ifp); 941 } 942 IFNET_RUNLOCK(); 943 } 944 945 int 946 in_ifaddr_broadcast(struct in_addr in, struct in_ifaddr *ia) 947 { 948 949 return ((in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 950 /* 951 * Check for old-style (host 0) broadcast, but 952 * taking into account that RFC 3021 obsoletes it. 953 */ 954 (ia->ia_subnetmask != IN_RFC3021_MASK && 955 ntohl(in.s_addr) == ia->ia_subnet)) && 956 /* 957 * Check for an all one subnetmask. These 958 * only exist when an interface gets a secondary 959 * address. 960 */ 961 ia->ia_subnetmask != (u_long)0xffffffff); 962 } 963 964 /* 965 * Return 1 if the address might be a local broadcast address. 966 */ 967 int 968 in_broadcast(struct in_addr in, struct ifnet *ifp) 969 { 970 struct ifaddr *ifa; 971 int found; 972 973 if (in.s_addr == INADDR_BROADCAST || 974 in.s_addr == INADDR_ANY) 975 return (1); 976 if ((ifp->if_flags & IFF_BROADCAST) == 0) 977 return (0); 978 found = 0; 979 /* 980 * Look through the list of addresses for a match 981 * with a broadcast address. 982 */ 983 IF_ADDR_RLOCK(ifp); 984 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 985 if (ifa->ifa_addr->sa_family == AF_INET && 986 in_ifaddr_broadcast(in, (struct in_ifaddr *)ifa)) { 987 found = 1; 988 break; 989 } 990 IF_ADDR_RUNLOCK(ifp); 991 return (found); 992 } 993 994 /* 995 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 996 */ 997 void 998 in_ifdetach(struct ifnet *ifp) 999 { 1000 IN_MULTI_LOCK(); 1001 in_pcbpurgeif0(&V_ripcbinfo, ifp); 1002 in_pcbpurgeif0(&V_udbinfo, ifp); 1003 in_pcbpurgeif0(&V_ulitecbinfo, ifp); 1004 in_purgemaddrs(ifp); 1005 IN_MULTI_UNLOCK(); 1006 } 1007 1008 /* 1009 * Delete all IPv4 multicast address records, and associated link-layer 1010 * multicast address records, associated with ifp. 1011 * XXX It looks like domifdetach runs AFTER the link layer cleanup. 1012 * XXX This should not race with ifma_protospec being set during 1013 * a new allocation, if it does, we have bigger problems. 1014 */ 1015 static void 1016 in_purgemaddrs(struct ifnet *ifp) 1017 { 1018 struct in_multi_head purgeinms; 1019 struct in_multi *inm; 1020 struct ifmultiaddr *ifma, *next; 1021 1022 SLIST_INIT(&purgeinms); 1023 IN_MULTI_LIST_LOCK(); 1024 1025 /* 1026 * Extract list of in_multi associated with the detaching ifp 1027 * which the PF_INET layer is about to release. 1028 * We need to do this as IF_ADDR_LOCK() may be re-acquired 1029 * by code further down. 1030 */ 1031 IF_ADDR_WLOCK(ifp); 1032 restart: 1033 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) { 1034 if (ifma->ifma_addr->sa_family != AF_INET || 1035 ifma->ifma_protospec == NULL) 1036 continue; 1037 inm = (struct in_multi *)ifma->ifma_protospec; 1038 inm_rele_locked(&purgeinms, inm); 1039 if (__predict_false(ifma_restart)) { 1040 ifma_restart = true; 1041 goto restart; 1042 } 1043 } 1044 IF_ADDR_WUNLOCK(ifp); 1045 1046 inm_release_list_deferred(&purgeinms); 1047 igmp_ifdetach(ifp); 1048 IN_MULTI_LIST_UNLOCK(); 1049 } 1050 1051 struct in_llentry { 1052 struct llentry base; 1053 }; 1054 1055 #define IN_LLTBL_DEFAULT_HSIZE 32 1056 #define IN_LLTBL_HASH(k, h) \ 1057 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 1058 1059 /* 1060 * Do actual deallocation of @lle. 1061 */ 1062 static void 1063 in_lltable_destroy_lle_unlocked(epoch_context_t ctx) 1064 { 1065 struct llentry *lle; 1066 1067 lle = __containerof(ctx, struct llentry, lle_epoch_ctx); 1068 LLE_LOCK_DESTROY(lle); 1069 LLE_REQ_DESTROY(lle); 1070 free(lle, M_LLTABLE); 1071 } 1072 1073 /* 1074 * Called by the datapath to indicate that 1075 * the entry was used. 1076 */ 1077 static void 1078 in_lltable_mark_used(struct llentry *lle) 1079 { 1080 1081 LLE_REQ_LOCK(lle); 1082 lle->r_skip_req = 0; 1083 LLE_REQ_UNLOCK(lle); 1084 } 1085 1086 /* 1087 * Called by LLE_FREE_LOCKED when number of references 1088 * drops to zero. 1089 */ 1090 static void 1091 in_lltable_destroy_lle(struct llentry *lle) 1092 { 1093 1094 LLE_WUNLOCK(lle); 1095 epoch_call(net_epoch_preempt, &lle->lle_epoch_ctx, in_lltable_destroy_lle_unlocked); 1096 } 1097 1098 static struct llentry * 1099 in_lltable_new(struct in_addr addr4, u_int flags) 1100 { 1101 struct in_llentry *lle; 1102 1103 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 1104 if (lle == NULL) /* NB: caller generates msg */ 1105 return NULL; 1106 1107 /* 1108 * For IPv4 this will trigger "arpresolve" to generate 1109 * an ARP request. 1110 */ 1111 lle->base.la_expire = time_uptime; /* mark expired */ 1112 lle->base.r_l3addr.addr4 = addr4; 1113 lle->base.lle_refcnt = 1; 1114 lle->base.lle_free = in_lltable_destroy_lle; 1115 LLE_LOCK_INIT(&lle->base); 1116 LLE_REQ_INIT(&lle->base); 1117 callout_init(&lle->base.lle_timer, 1); 1118 1119 return (&lle->base); 1120 } 1121 1122 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 1123 ((((d).s_addr ^ (a).s_addr) & (m).s_addr)) == 0 ) 1124 1125 static int 1126 in_lltable_match_prefix(const struct sockaddr *saddr, 1127 const struct sockaddr *smask, u_int flags, struct llentry *lle) 1128 { 1129 struct in_addr addr, mask, lle_addr; 1130 1131 addr = ((const struct sockaddr_in *)saddr)->sin_addr; 1132 mask = ((const struct sockaddr_in *)smask)->sin_addr; 1133 lle_addr.s_addr = ntohl(lle->r_l3addr.addr4.s_addr); 1134 1135 if (IN_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0) 1136 return (0); 1137 1138 if (lle->la_flags & LLE_IFADDR) { 1139 1140 /* 1141 * Delete LLE_IFADDR records IFF address & flag matches. 1142 * Note that addr is the interface address within prefix 1143 * being matched. 1144 * Note also we should handle 'ifdown' cases without removing 1145 * ifaddr macs. 1146 */ 1147 if (addr.s_addr == lle_addr.s_addr && (flags & LLE_STATIC) != 0) 1148 return (1); 1149 return (0); 1150 } 1151 1152 /* flags & LLE_STATIC means deleting both dynamic and static entries */ 1153 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC)) 1154 return (1); 1155 1156 return (0); 1157 } 1158 1159 static void 1160 in_lltable_free_entry(struct lltable *llt, struct llentry *lle) 1161 { 1162 size_t pkts_dropped; 1163 1164 LLE_WLOCK_ASSERT(lle); 1165 KASSERT(llt != NULL, ("lltable is NULL")); 1166 1167 /* Unlink entry from table if not already */ 1168 if ((lle->la_flags & LLE_LINKED) != 0) { 1169 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp); 1170 lltable_unlink_entry(llt, lle); 1171 } 1172 1173 /* Drop hold queue */ 1174 pkts_dropped = llentry_free(lle); 1175 ARPSTAT_ADD(dropped, pkts_dropped); 1176 } 1177 1178 static int 1179 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr) 1180 { 1181 struct rt_addrinfo info; 1182 struct sockaddr_in rt_key, rt_mask; 1183 struct sockaddr rt_gateway; 1184 int rt_flags; 1185 1186 KASSERT(l3addr->sa_family == AF_INET, 1187 ("sin_family %d", l3addr->sa_family)); 1188 1189 bzero(&rt_key, sizeof(rt_key)); 1190 rt_key.sin_len = sizeof(rt_key); 1191 bzero(&rt_mask, sizeof(rt_mask)); 1192 rt_mask.sin_len = sizeof(rt_mask); 1193 bzero(&rt_gateway, sizeof(rt_gateway)); 1194 rt_gateway.sa_len = sizeof(rt_gateway); 1195 1196 bzero(&info, sizeof(info)); 1197 info.rti_info[RTAX_DST] = (struct sockaddr *)&rt_key; 1198 info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&rt_mask; 1199 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&rt_gateway; 1200 1201 if (rib_lookup_info(ifp->if_fib, l3addr, NHR_REF, 0, &info) != 0) 1202 return (EINVAL); 1203 1204 rt_flags = info.rti_flags; 1205 1206 /* 1207 * If the gateway for an existing host route matches the target L3 1208 * address, which is a special route inserted by some implementation 1209 * such as MANET, and the interface is of the correct type, then 1210 * allow for ARP to proceed. 1211 */ 1212 if (rt_flags & RTF_GATEWAY) { 1213 if (!(rt_flags & RTF_HOST) || !info.rti_ifp || 1214 info.rti_ifp->if_type != IFT_ETHER || 1215 (info.rti_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 || 1216 memcmp(rt_gateway.sa_data, l3addr->sa_data, 1217 sizeof(in_addr_t)) != 0) { 1218 rib_free_info(&info); 1219 return (EINVAL); 1220 } 1221 } 1222 rib_free_info(&info); 1223 1224 /* 1225 * Make sure that at least the destination address is covered 1226 * by the route. This is for handling the case where 2 or more 1227 * interfaces have the same prefix. An incoming packet arrives 1228 * on one interface and the corresponding outgoing packet leaves 1229 * another interface. 1230 */ 1231 if (!(rt_flags & RTF_HOST) && info.rti_ifp != ifp) { 1232 const char *sa, *mask, *addr, *lim; 1233 const struct sockaddr_in *l3sin; 1234 1235 mask = (const char *)&rt_mask; 1236 /* 1237 * Just being extra cautious to avoid some custom 1238 * code getting into trouble. 1239 */ 1240 if ((info.rti_addrs & RTA_NETMASK) == 0) 1241 return (EINVAL); 1242 1243 sa = (const char *)&rt_key; 1244 addr = (const char *)l3addr; 1245 l3sin = (const struct sockaddr_in *)l3addr; 1246 lim = addr + l3sin->sin_len; 1247 1248 for ( ; addr < lim; sa++, mask++, addr++) { 1249 if ((*sa ^ *addr) & *mask) { 1250 #ifdef DIAGNOSTIC 1251 char addrbuf[INET_ADDRSTRLEN]; 1252 1253 log(LOG_INFO, "IPv4 address: \"%s\" " 1254 "is not on the network\n", 1255 inet_ntoa_r(l3sin->sin_addr, addrbuf)); 1256 #endif 1257 return (EINVAL); 1258 } 1259 } 1260 } 1261 1262 return (0); 1263 } 1264 1265 static inline uint32_t 1266 in_lltable_hash_dst(const struct in_addr dst, uint32_t hsize) 1267 { 1268 1269 return (IN_LLTBL_HASH(dst.s_addr, hsize)); 1270 } 1271 1272 static uint32_t 1273 in_lltable_hash(const struct llentry *lle, uint32_t hsize) 1274 { 1275 1276 return (in_lltable_hash_dst(lle->r_l3addr.addr4, hsize)); 1277 } 1278 1279 static void 1280 in_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 1281 { 1282 struct sockaddr_in *sin; 1283 1284 sin = (struct sockaddr_in *)sa; 1285 bzero(sin, sizeof(*sin)); 1286 sin->sin_family = AF_INET; 1287 sin->sin_len = sizeof(*sin); 1288 sin->sin_addr = lle->r_l3addr.addr4; 1289 } 1290 1291 static inline struct llentry * 1292 in_lltable_find_dst(struct lltable *llt, struct in_addr dst) 1293 { 1294 struct llentry *lle; 1295 struct llentries *lleh; 1296 u_int hashidx; 1297 1298 hashidx = in_lltable_hash_dst(dst, llt->llt_hsize); 1299 lleh = &llt->lle_head[hashidx]; 1300 CK_LIST_FOREACH(lle, lleh, lle_next) { 1301 if (lle->la_flags & LLE_DELETED) 1302 continue; 1303 if (lle->r_l3addr.addr4.s_addr == dst.s_addr) 1304 break; 1305 } 1306 1307 return (lle); 1308 } 1309 1310 static void 1311 in_lltable_delete_entry(struct lltable *llt, struct llentry *lle) 1312 { 1313 1314 lle->la_flags |= LLE_DELETED; 1315 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 1316 #ifdef DIAGNOSTIC 1317 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 1318 #endif 1319 llentry_free(lle); 1320 } 1321 1322 static struct llentry * 1323 in_lltable_alloc(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1324 { 1325 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1326 struct ifnet *ifp = llt->llt_ifp; 1327 struct llentry *lle; 1328 char linkhdr[LLE_MAX_LINKHDR]; 1329 size_t linkhdrsize; 1330 int lladdr_off; 1331 1332 KASSERT(l3addr->sa_family == AF_INET, 1333 ("sin_family %d", l3addr->sa_family)); 1334 1335 /* 1336 * A route that covers the given address must have 1337 * been installed 1st because we are doing a resolution, 1338 * verify this. 1339 */ 1340 if (!(flags & LLE_IFADDR) && 1341 in_lltable_rtcheck(ifp, flags, l3addr) != 0) 1342 return (NULL); 1343 1344 lle = in_lltable_new(sin->sin_addr, flags); 1345 if (lle == NULL) { 1346 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 1347 return (NULL); 1348 } 1349 lle->la_flags = flags; 1350 if (flags & LLE_STATIC) 1351 lle->r_flags |= RLLE_VALID; 1352 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 1353 linkhdrsize = LLE_MAX_LINKHDR; 1354 if (lltable_calc_llheader(ifp, AF_INET, IF_LLADDR(ifp), 1355 linkhdr, &linkhdrsize, &lladdr_off) != 0) { 1356 epoch_call(net_epoch_preempt, &lle->lle_epoch_ctx, in_lltable_destroy_lle_unlocked); 1357 return (NULL); 1358 } 1359 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize, 1360 lladdr_off); 1361 lle->la_flags |= LLE_STATIC; 1362 lle->r_flags |= (RLLE_VALID | RLLE_IFADDR); 1363 } 1364 1365 return (lle); 1366 } 1367 1368 /* 1369 * Return NULL if not found or marked for deletion. 1370 * If found return lle read locked. 1371 */ 1372 static struct llentry * 1373 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1374 { 1375 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1376 struct llentry *lle; 1377 1378 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 1379 KASSERT(l3addr->sa_family == AF_INET, 1380 ("sin_family %d", l3addr->sa_family)); 1381 lle = in_lltable_find_dst(llt, sin->sin_addr); 1382 1383 if (lle == NULL) 1384 return (NULL); 1385 1386 KASSERT((flags & (LLE_UNLOCKED|LLE_EXCLUSIVE)) != 1387 (LLE_UNLOCKED|LLE_EXCLUSIVE),("wrong lle request flags: 0x%X", 1388 flags)); 1389 1390 if (flags & LLE_UNLOCKED) 1391 return (lle); 1392 1393 if (flags & LLE_EXCLUSIVE) 1394 LLE_WLOCK(lle); 1395 else 1396 LLE_RLOCK(lle); 1397 1398 return (lle); 1399 } 1400 1401 static int 1402 in_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 1403 struct sysctl_req *wr) 1404 { 1405 struct ifnet *ifp = llt->llt_ifp; 1406 /* XXX stack use */ 1407 struct { 1408 struct rt_msghdr rtm; 1409 struct sockaddr_in sin; 1410 struct sockaddr_dl sdl; 1411 } arpc; 1412 struct sockaddr_dl *sdl; 1413 int error; 1414 1415 bzero(&arpc, sizeof(arpc)); 1416 /* skip deleted entries */ 1417 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 1418 return (0); 1419 /* Skip if jailed and not a valid IP of the prison. */ 1420 lltable_fill_sa_entry(lle,(struct sockaddr *)&arpc.sin); 1421 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&arpc.sin) != 0) 1422 return (0); 1423 /* 1424 * produce a msg made of: 1425 * struct rt_msghdr; 1426 * struct sockaddr_in; (IPv4) 1427 * struct sockaddr_dl; 1428 */ 1429 arpc.rtm.rtm_msglen = sizeof(arpc); 1430 arpc.rtm.rtm_version = RTM_VERSION; 1431 arpc.rtm.rtm_type = RTM_GET; 1432 arpc.rtm.rtm_flags = RTF_UP; 1433 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1434 1435 /* publish */ 1436 if (lle->la_flags & LLE_PUB) 1437 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1438 1439 sdl = &arpc.sdl; 1440 sdl->sdl_family = AF_LINK; 1441 sdl->sdl_len = sizeof(*sdl); 1442 sdl->sdl_index = ifp->if_index; 1443 sdl->sdl_type = ifp->if_type; 1444 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 1445 sdl->sdl_alen = ifp->if_addrlen; 1446 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1447 } else { 1448 sdl->sdl_alen = 0; 1449 bzero(LLADDR(sdl), ifp->if_addrlen); 1450 } 1451 1452 arpc.rtm.rtm_rmx.rmx_expire = 1453 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1454 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1455 if (lle->la_flags & LLE_STATIC) 1456 arpc.rtm.rtm_flags |= RTF_STATIC; 1457 if (lle->la_flags & LLE_IFADDR) 1458 arpc.rtm.rtm_flags |= RTF_PINNED; 1459 arpc.rtm.rtm_index = ifp->if_index; 1460 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1461 1462 return (error); 1463 } 1464 1465 static struct lltable * 1466 in_lltattach(struct ifnet *ifp) 1467 { 1468 struct lltable *llt; 1469 1470 llt = lltable_allocate_htbl(IN_LLTBL_DEFAULT_HSIZE); 1471 llt->llt_af = AF_INET; 1472 llt->llt_ifp = ifp; 1473 1474 llt->llt_lookup = in_lltable_lookup; 1475 llt->llt_alloc_entry = in_lltable_alloc; 1476 llt->llt_delete_entry = in_lltable_delete_entry; 1477 llt->llt_dump_entry = in_lltable_dump_entry; 1478 llt->llt_hash = in_lltable_hash; 1479 llt->llt_fill_sa_entry = in_lltable_fill_sa_entry; 1480 llt->llt_free_entry = in_lltable_free_entry; 1481 llt->llt_match_prefix = in_lltable_match_prefix; 1482 llt->llt_mark_used = in_lltable_mark_used; 1483 lltable_link(llt); 1484 1485 return (llt); 1486 } 1487 1488 void * 1489 in_domifattach(struct ifnet *ifp) 1490 { 1491 struct in_ifinfo *ii; 1492 1493 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); 1494 1495 ii->ii_llt = in_lltattach(ifp); 1496 ii->ii_igmp = igmp_domifattach(ifp); 1497 1498 return (ii); 1499 } 1500 1501 void 1502 in_domifdetach(struct ifnet *ifp, void *aux) 1503 { 1504 struct in_ifinfo *ii = (struct in_ifinfo *)aux; 1505 1506 igmp_domifdetach(ifp); 1507 lltable_free(ii->ii_llt); 1508 free(ii, M_IFADDR); 1509 } 1510