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