in.c revision 201282
1/*- 2 * Copyright (c) 1982, 1986, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (C) 2001 WIDE Project. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 4. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * @(#)in.c 8.4 (Berkeley) 1/9/95 31 */ 32 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD: head/sys/netinet/in.c 201282 2009-12-30 21:35:34Z qingli $"); 35 36#include "opt_carp.h" 37 38#include <sys/param.h> 39#include <sys/systm.h> 40#include <sys/sockio.h> 41#include <sys/malloc.h> 42#include <sys/priv.h> 43#include <sys/socket.h> 44#include <sys/jail.h> 45#include <sys/kernel.h> 46#include <sys/proc.h> 47#include <sys/sysctl.h> 48#include <sys/syslog.h> 49 50#include <net/if.h> 51#include <net/if_var.h> 52#include <net/if_dl.h> 53#include <net/if_llatbl.h> 54#include <net/if_types.h> 55#include <net/route.h> 56#include <net/vnet.h> 57 58#include <netinet/in.h> 59#include <netinet/in_var.h> 60#include <netinet/in_pcb.h> 61#include <netinet/ip_var.h> 62#include <netinet/igmp_var.h> 63#include <netinet/udp.h> 64#include <netinet/udp_var.h> 65 66static int in_mask2len(struct in_addr *); 67static void in_len2mask(struct in_addr *, int); 68static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, 69 struct ifnet *, struct thread *); 70 71static int in_addprefix(struct in_ifaddr *, int); 72static int in_scrubprefix(struct in_ifaddr *); 73static void in_socktrim(struct sockaddr_in *); 74static int in_ifinit(struct ifnet *, 75 struct in_ifaddr *, struct sockaddr_in *, int); 76static void in_purgemaddrs(struct ifnet *); 77 78static VNET_DEFINE(int, subnetsarelocal); 79static VNET_DEFINE(int, sameprefixcarponly); 80VNET_DECLARE(struct inpcbinfo, ripcbinfo); 81 82#define V_subnetsarelocal VNET(subnetsarelocal) 83#define V_sameprefixcarponly VNET(sameprefixcarponly) 84#define V_ripcbinfo VNET(ripcbinfo) 85 86SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 87 &VNET_NAME(subnetsarelocal), 0, 88 "Treat all subnets as directly connected"); 89SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, same_prefix_carp_only, CTLFLAG_RW, 90 &VNET_NAME(sameprefixcarponly), 0, 91 "Refuse to create same prefixes on different interfaces"); 92 93/* 94 * Return 1 if an internet address is for a ``local'' host 95 * (one to which we have a connection). If subnetsarelocal 96 * is true, this includes other subnets of the local net. 97 * Otherwise, it includes only the directly-connected (sub)nets. 98 */ 99int 100in_localaddr(struct in_addr in) 101{ 102 register u_long i = ntohl(in.s_addr); 103 register struct in_ifaddr *ia; 104 105 IN_IFADDR_RLOCK(); 106 if (V_subnetsarelocal) { 107 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 108 if ((i & ia->ia_netmask) == ia->ia_net) { 109 IN_IFADDR_RUNLOCK(); 110 return (1); 111 } 112 } 113 } else { 114 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 115 if ((i & ia->ia_subnetmask) == ia->ia_subnet) { 116 IN_IFADDR_RUNLOCK(); 117 return (1); 118 } 119 } 120 } 121 IN_IFADDR_RUNLOCK(); 122 return (0); 123} 124 125/* 126 * Return 1 if an internet address is for the local host and configured 127 * on one of its interfaces. 128 */ 129int 130in_localip(struct in_addr in) 131{ 132 struct in_ifaddr *ia; 133 134 IN_IFADDR_RLOCK(); 135 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { 136 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) { 137 IN_IFADDR_RUNLOCK(); 138 return (1); 139 } 140 } 141 IN_IFADDR_RUNLOCK(); 142 return (0); 143} 144 145/* 146 * Determine whether an IP address is in a reserved set of addresses 147 * that may not be forwarded, or whether datagrams to that destination 148 * may be forwarded. 149 */ 150int 151in_canforward(struct in_addr in) 152{ 153 register u_long i = ntohl(in.s_addr); 154 register u_long net; 155 156 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i)) 157 return (0); 158 if (IN_CLASSA(i)) { 159 net = i & IN_CLASSA_NET; 160 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 161 return (0); 162 } 163 return (1); 164} 165 166/* 167 * Trim a mask in a sockaddr 168 */ 169static void 170in_socktrim(struct sockaddr_in *ap) 171{ 172 register char *cplim = (char *) &ap->sin_addr; 173 register char *cp = (char *) (&ap->sin_addr + 1); 174 175 ap->sin_len = 0; 176 while (--cp >= cplim) 177 if (*cp) { 178 (ap)->sin_len = cp - (char *) (ap) + 1; 179 break; 180 } 181} 182 183static int 184in_mask2len(mask) 185 struct in_addr *mask; 186{ 187 int x, y; 188 u_char *p; 189 190 p = (u_char *)mask; 191 for (x = 0; x < sizeof(*mask); x++) { 192 if (p[x] != 0xff) 193 break; 194 } 195 y = 0; 196 if (x < sizeof(*mask)) { 197 for (y = 0; y < 8; y++) { 198 if ((p[x] & (0x80 >> y)) == 0) 199 break; 200 } 201 } 202 return (x * 8 + y); 203} 204 205static void 206in_len2mask(struct in_addr *mask, int len) 207{ 208 int i; 209 u_char *p; 210 211 p = (u_char *)mask; 212 bzero(mask, sizeof(*mask)); 213 for (i = 0; i < len / 8; i++) 214 p[i] = 0xff; 215 if (len % 8) 216 p[i] = (0xff00 >> (len % 8)) & 0xff; 217} 218 219/* 220 * Generic internet control operations (ioctl's). 221 * 222 * ifp is NULL if not an interface-specific ioctl. 223 */ 224/* ARGSUSED */ 225int 226in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 227 struct thread *td) 228{ 229 register struct ifreq *ifr = (struct ifreq *)data; 230 register struct in_ifaddr *ia, *iap; 231 register struct ifaddr *ifa; 232 struct in_addr allhosts_addr; 233 struct in_addr dst; 234 struct in_ifinfo *ii; 235 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 236 struct sockaddr_in oldaddr; 237 int error, hostIsNew, iaIsNew, maskIsNew; 238 int iaIsFirst; 239 240 ia = NULL; 241 iaIsFirst = 0; 242 iaIsNew = 0; 243 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 244 245 /* 246 * Filter out ioctls we implement directly; forward the rest on to 247 * in_lifaddr_ioctl() and ifp->if_ioctl(). 248 */ 249 switch (cmd) { 250 case SIOCAIFADDR: 251 case SIOCDIFADDR: 252 case SIOCGIFADDR: 253 case SIOCGIFBRDADDR: 254 case SIOCGIFDSTADDR: 255 case SIOCGIFNETMASK: 256 case SIOCSIFADDR: 257 case SIOCSIFBRDADDR: 258 case SIOCSIFDSTADDR: 259 case SIOCSIFNETMASK: 260 break; 261 262 case SIOCALIFADDR: 263 if (td != NULL) { 264 error = priv_check(td, PRIV_NET_ADDIFADDR); 265 if (error) 266 return (error); 267 } 268 if (ifp == NULL) 269 return (EINVAL); 270 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 271 272 case SIOCDLIFADDR: 273 if (td != NULL) { 274 error = priv_check(td, PRIV_NET_DELIFADDR); 275 if (error) 276 return (error); 277 } 278 if (ifp == NULL) 279 return (EINVAL); 280 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 281 282 case SIOCGLIFADDR: 283 if (ifp == NULL) 284 return (EINVAL); 285 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 286 287 default: 288 if (ifp == NULL || ifp->if_ioctl == NULL) 289 return (EOPNOTSUPP); 290 return ((*ifp->if_ioctl)(ifp, cmd, data)); 291 } 292 293 if (ifp == NULL) 294 return (EADDRNOTAVAIL); 295 296 /* 297 * Security checks before we get involved in any work. 298 */ 299 switch (cmd) { 300 case SIOCAIFADDR: 301 case SIOCSIFADDR: 302 case SIOCSIFBRDADDR: 303 case SIOCSIFNETMASK: 304 case SIOCSIFDSTADDR: 305 if (td != NULL) { 306 error = priv_check(td, PRIV_NET_ADDIFADDR); 307 if (error) 308 return (error); 309 } 310 break; 311 312 case SIOCDIFADDR: 313 if (td != NULL) { 314 error = priv_check(td, PRIV_NET_DELIFADDR); 315 if (error) 316 return (error); 317 } 318 break; 319 } 320 321 /* 322 * Find address for this interface, if it exists. 323 * 324 * If an alias address was specified, find that one instead of the 325 * first one on the interface, if possible. 326 */ 327 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 328 IN_IFADDR_RLOCK(); 329 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) { 330 if (iap->ia_ifp == ifp && 331 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 332 if (td == NULL || prison_check_ip4(td->td_ucred, 333 &dst) == 0) 334 ia = iap; 335 break; 336 } 337 } 338 if (ia != NULL) 339 ifa_ref(&ia->ia_ifa); 340 IN_IFADDR_RUNLOCK(); 341 if (ia == NULL) { 342 IF_ADDR_LOCK(ifp); 343 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 344 iap = ifatoia(ifa); 345 if (iap->ia_addr.sin_family == AF_INET) { 346 if (td != NULL && 347 prison_check_ip4(td->td_ucred, 348 &iap->ia_addr.sin_addr) != 0) 349 continue; 350 ia = iap; 351 break; 352 } 353 } 354 if (ia != NULL) 355 ifa_ref(&ia->ia_ifa); 356 IF_ADDR_UNLOCK(ifp); 357 } 358 if (ia == NULL) 359 iaIsFirst = 1; 360 361 error = 0; 362 switch (cmd) { 363 case SIOCAIFADDR: 364 case SIOCDIFADDR: 365 if (ifra->ifra_addr.sin_family == AF_INET) { 366 struct in_ifaddr *oia; 367 368 IN_IFADDR_RLOCK(); 369 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 370 if (ia->ia_ifp == ifp && 371 ia->ia_addr.sin_addr.s_addr == 372 ifra->ifra_addr.sin_addr.s_addr) 373 break; 374 } 375 if (ia != NULL && ia != oia) 376 ifa_ref(&ia->ia_ifa); 377 if (oia != NULL && ia != oia) 378 ifa_free(&oia->ia_ifa); 379 IN_IFADDR_RUNLOCK(); 380 if ((ifp->if_flags & IFF_POINTOPOINT) 381 && (cmd == SIOCAIFADDR) 382 && (ifra->ifra_dstaddr.sin_addr.s_addr 383 == INADDR_ANY)) { 384 error = EDESTADDRREQ; 385 goto out; 386 } 387 } 388 if (cmd == SIOCDIFADDR && ia == NULL) { 389 error = EADDRNOTAVAIL; 390 goto out; 391 } 392 /* FALLTHROUGH */ 393 case SIOCSIFADDR: 394 case SIOCSIFNETMASK: 395 case SIOCSIFDSTADDR: 396 if (ia == NULL) { 397 ia = (struct in_ifaddr *) 398 malloc(sizeof *ia, M_IFADDR, M_NOWAIT | 399 M_ZERO); 400 if (ia == NULL) { 401 error = ENOBUFS; 402 goto out; 403 } 404 405 ifa = &ia->ia_ifa; 406 ifa_init(ifa); 407 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 408 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 409 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 410 411 ia->ia_sockmask.sin_len = 8; 412 ia->ia_sockmask.sin_family = AF_INET; 413 if (ifp->if_flags & IFF_BROADCAST) { 414 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 415 ia->ia_broadaddr.sin_family = AF_INET; 416 } 417 ia->ia_ifp = ifp; 418 419 ifa_ref(ifa); /* if_addrhead */ 420 IF_ADDR_LOCK(ifp); 421 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 422 IF_ADDR_UNLOCK(ifp); 423 ifa_ref(ifa); /* in_ifaddrhead */ 424 IN_IFADDR_WLOCK(); 425 TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link); 426 IN_IFADDR_WUNLOCK(); 427 iaIsNew = 1; 428 } 429 break; 430 431 case SIOCSIFBRDADDR: 432 case SIOCGIFADDR: 433 case SIOCGIFNETMASK: 434 case SIOCGIFDSTADDR: 435 case SIOCGIFBRDADDR: 436 if (ia == NULL) { 437 error = EADDRNOTAVAIL; 438 goto out; 439 } 440 break; 441 } 442 443 /* 444 * Most paths in this switch return directly or via out. Only paths 445 * that remove the address break in order to hit common removal code. 446 */ 447 switch (cmd) { 448 case SIOCGIFADDR: 449 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 450 goto out; 451 452 case SIOCGIFBRDADDR: 453 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 454 error = EINVAL; 455 goto out; 456 } 457 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 458 goto out; 459 460 case SIOCGIFDSTADDR: 461 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 462 error = EINVAL; 463 goto out; 464 } 465 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 466 goto out; 467 468 case SIOCGIFNETMASK: 469 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 470 goto out; 471 472 case SIOCSIFDSTADDR: 473 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 474 error = EINVAL; 475 goto out; 476 } 477 oldaddr = ia->ia_dstaddr; 478 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 479 if (ifp->if_ioctl != NULL) { 480 error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, 481 (caddr_t)ia); 482 if (error) { 483 ia->ia_dstaddr = oldaddr; 484 goto out; 485 } 486 } 487 if (ia->ia_flags & IFA_ROUTE) { 488 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 489 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 490 ia->ia_ifa.ifa_dstaddr = 491 (struct sockaddr *)&ia->ia_dstaddr; 492 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 493 } 494 goto out; 495 496 case SIOCSIFBRDADDR: 497 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 498 error = EINVAL; 499 goto out; 500 } 501 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 502 goto out; 503 504 case SIOCSIFADDR: 505 error = in_ifinit(ifp, ia, 506 (struct sockaddr_in *) &ifr->ifr_addr, 1); 507 if (error != 0 && iaIsNew) 508 break; 509 if (error == 0) { 510 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 511 if (iaIsFirst && 512 (ifp->if_flags & IFF_MULTICAST) != 0) { 513 error = in_joingroup(ifp, &allhosts_addr, 514 NULL, &ii->ii_allhosts); 515 } 516 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 517 } 518 error = 0; 519 goto out; 520 521 case SIOCSIFNETMASK: 522 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 523 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 524 goto out; 525 526 case SIOCAIFADDR: 527 maskIsNew = 0; 528 hostIsNew = 1; 529 error = 0; 530 if (ia->ia_addr.sin_family == AF_INET) { 531 if (ifra->ifra_addr.sin_len == 0) { 532 ifra->ifra_addr = ia->ia_addr; 533 hostIsNew = 0; 534 } else if (ifra->ifra_addr.sin_addr.s_addr == 535 ia->ia_addr.sin_addr.s_addr) 536 hostIsNew = 0; 537 } 538 if (ifra->ifra_mask.sin_len) { 539 /* 540 * QL: XXX 541 * Need to scrub the prefix here in case 542 * the issued command is SIOCAIFADDR with 543 * the same address, but with a different 544 * prefix length. And if the prefix length 545 * is the same as before, then the call is 546 * un-necessarily executed here. 547 */ 548 in_ifscrub(ifp, ia); 549 ia->ia_sockmask = ifra->ifra_mask; 550 ia->ia_sockmask.sin_family = AF_INET; 551 ia->ia_subnetmask = 552 ntohl(ia->ia_sockmask.sin_addr.s_addr); 553 maskIsNew = 1; 554 } 555 if ((ifp->if_flags & IFF_POINTOPOINT) && 556 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 557 in_ifscrub(ifp, ia); 558 ia->ia_dstaddr = ifra->ifra_dstaddr; 559 maskIsNew = 1; /* We lie; but the effect's the same */ 560 } 561 if (ifra->ifra_addr.sin_family == AF_INET && 562 (hostIsNew || maskIsNew)) 563 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 564 if (error != 0 && iaIsNew) 565 goto out; 566 567 if ((ifp->if_flags & IFF_BROADCAST) && 568 (ifra->ifra_broadaddr.sin_family == AF_INET)) 569 ia->ia_broadaddr = ifra->ifra_broadaddr; 570 if (error == 0) { 571 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 572 if (iaIsFirst && 573 (ifp->if_flags & IFF_MULTICAST) != 0) { 574 error = in_joingroup(ifp, &allhosts_addr, 575 NULL, &ii->ii_allhosts); 576 } 577 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 578 } 579 goto out; 580 581 case SIOCDIFADDR: 582 /* 583 * in_ifscrub kills the interface route. 584 */ 585 in_ifscrub(ifp, ia); 586 587 /* 588 * in_ifadown gets rid of all the rest of 589 * the routes. This is not quite the right 590 * thing to do, but at least if we are running 591 * a routing process they will come back. 592 */ 593 in_ifadown(&ia->ia_ifa, 1); 594 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 595 error = 0; 596 break; 597 598 default: 599 panic("in_control: unsupported ioctl"); 600 } 601 602 IF_ADDR_LOCK(ifp); 603 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 604 IF_ADDR_UNLOCK(ifp); 605 ifa_free(&ia->ia_ifa); /* if_addrhead */ 606 607 IN_IFADDR_WLOCK(); 608 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link); 609 if (ia->ia_addr.sin_family == AF_INET) { 610 struct in_ifaddr *if_ia; 611 612 LIST_REMOVE(ia, ia_hash); 613 IN_IFADDR_WUNLOCK(); 614 /* 615 * If this is the last IPv4 address configured on this 616 * interface, leave the all-hosts group. 617 * No state-change report need be transmitted. 618 */ 619 if_ia = NULL; 620 IFP_TO_IA(ifp, if_ia); 621 if (if_ia == NULL) { 622 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 623 IN_MULTI_LOCK(); 624 if (ii->ii_allhosts) { 625 (void)in_leavegroup_locked(ii->ii_allhosts, 626 NULL); 627 ii->ii_allhosts = NULL; 628 } 629 IN_MULTI_UNLOCK(); 630 } else 631 ifa_free(&if_ia->ia_ifa); 632 } else 633 IN_IFADDR_WUNLOCK(); 634 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 635out: 636 if (ia != NULL) 637 ifa_free(&ia->ia_ifa); 638 return (error); 639} 640 641/* 642 * SIOC[GAD]LIFADDR. 643 * SIOCGLIFADDR: get first address. (?!?) 644 * SIOCGLIFADDR with IFLR_PREFIX: 645 * get first address that matches the specified prefix. 646 * SIOCALIFADDR: add the specified address. 647 * SIOCALIFADDR with IFLR_PREFIX: 648 * EINVAL since we can't deduce hostid part of the address. 649 * SIOCDLIFADDR: delete the specified address. 650 * SIOCDLIFADDR with IFLR_PREFIX: 651 * delete the first address that matches the specified prefix. 652 * return values: 653 * EINVAL on invalid parameters 654 * EADDRNOTAVAIL on prefix match failed/specified address not found 655 * other values may be returned from in_ioctl() 656 */ 657static int 658in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 659 struct ifnet *ifp, struct thread *td) 660{ 661 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 662 struct ifaddr *ifa; 663 664 /* sanity checks */ 665 if (data == NULL || ifp == NULL) { 666 panic("invalid argument to in_lifaddr_ioctl"); 667 /*NOTRECHED*/ 668 } 669 670 switch (cmd) { 671 case SIOCGLIFADDR: 672 /* address must be specified on GET with IFLR_PREFIX */ 673 if ((iflr->flags & IFLR_PREFIX) == 0) 674 break; 675 /*FALLTHROUGH*/ 676 case SIOCALIFADDR: 677 case SIOCDLIFADDR: 678 /* address must be specified on ADD and DELETE */ 679 if (iflr->addr.ss_family != AF_INET) 680 return (EINVAL); 681 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 682 return (EINVAL); 683 /* XXX need improvement */ 684 if (iflr->dstaddr.ss_family 685 && iflr->dstaddr.ss_family != AF_INET) 686 return (EINVAL); 687 if (iflr->dstaddr.ss_family 688 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 689 return (EINVAL); 690 break; 691 default: /*shouldn't happen*/ 692 return (EOPNOTSUPP); 693 } 694 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 695 return (EINVAL); 696 697 switch (cmd) { 698 case SIOCALIFADDR: 699 { 700 struct in_aliasreq ifra; 701 702 if (iflr->flags & IFLR_PREFIX) 703 return (EINVAL); 704 705 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 706 bzero(&ifra, sizeof(ifra)); 707 bcopy(iflr->iflr_name, ifra.ifra_name, 708 sizeof(ifra.ifra_name)); 709 710 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 711 712 if (iflr->dstaddr.ss_family) { /*XXX*/ 713 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 714 iflr->dstaddr.ss_len); 715 } 716 717 ifra.ifra_mask.sin_family = AF_INET; 718 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 719 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 720 721 return (in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td)); 722 } 723 case SIOCGLIFADDR: 724 case SIOCDLIFADDR: 725 { 726 struct in_ifaddr *ia; 727 struct in_addr mask, candidate, match; 728 struct sockaddr_in *sin; 729 730 bzero(&mask, sizeof(mask)); 731 bzero(&match, sizeof(match)); 732 if (iflr->flags & IFLR_PREFIX) { 733 /* lookup a prefix rather than address. */ 734 in_len2mask(&mask, iflr->prefixlen); 735 736 sin = (struct sockaddr_in *)&iflr->addr; 737 match.s_addr = sin->sin_addr.s_addr; 738 match.s_addr &= mask.s_addr; 739 740 /* if you set extra bits, that's wrong */ 741 if (match.s_addr != sin->sin_addr.s_addr) 742 return (EINVAL); 743 744 } else { 745 /* on getting an address, take the 1st match */ 746 /* on deleting an address, do exact match */ 747 if (cmd != SIOCGLIFADDR) { 748 in_len2mask(&mask, 32); 749 sin = (struct sockaddr_in *)&iflr->addr; 750 match.s_addr = sin->sin_addr.s_addr; 751 } 752 } 753 754 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 755 if (ifa->ifa_addr->sa_family != AF_INET6) 756 continue; 757 if (match.s_addr == 0) 758 break; 759 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 760 candidate.s_addr &= mask.s_addr; 761 if (candidate.s_addr == match.s_addr) 762 break; 763 } 764 if (ifa == NULL) 765 return (EADDRNOTAVAIL); 766 ia = (struct in_ifaddr *)ifa; 767 768 if (cmd == SIOCGLIFADDR) { 769 /* fill in the if_laddrreq structure */ 770 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 771 772 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 773 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 774 ia->ia_dstaddr.sin_len); 775 } else 776 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 777 778 iflr->prefixlen = 779 in_mask2len(&ia->ia_sockmask.sin_addr); 780 781 iflr->flags = 0; /*XXX*/ 782 783 return (0); 784 } else { 785 struct in_aliasreq ifra; 786 787 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 788 bzero(&ifra, sizeof(ifra)); 789 bcopy(iflr->iflr_name, ifra.ifra_name, 790 sizeof(ifra.ifra_name)); 791 792 bcopy(&ia->ia_addr, &ifra.ifra_addr, 793 ia->ia_addr.sin_len); 794 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 795 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 796 ia->ia_dstaddr.sin_len); 797 } 798 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 799 ia->ia_sockmask.sin_len); 800 801 return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 802 ifp, td)); 803 } 804 } 805 } 806 807 return (EOPNOTSUPP); /*just for safety*/ 808} 809 810/* 811 * Delete any existing route for an interface. 812 */ 813void 814in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia) 815{ 816 817 in_scrubprefix(ia); 818} 819 820/* 821 * Initialize an interface's internet address 822 * and routing table entry. 823 */ 824static int 825in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, 826 int scrub) 827{ 828 register u_long i = ntohl(sin->sin_addr.s_addr); 829 struct sockaddr_in oldaddr; 830 int s = splimp(), flags = RTF_UP, error = 0; 831 832 oldaddr = ia->ia_addr; 833 if (oldaddr.sin_family == AF_INET) 834 LIST_REMOVE(ia, ia_hash); 835 ia->ia_addr = *sin; 836 if (ia->ia_addr.sin_family == AF_INET) { 837 IN_IFADDR_WLOCK(); 838 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 839 ia, ia_hash); 840 IN_IFADDR_WUNLOCK(); 841 } 842 /* 843 * Give the interface a chance to initialize 844 * if this is its first address, 845 * and to validate the address if necessary. 846 */ 847 if (ifp->if_ioctl != NULL) { 848 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 849 if (error) { 850 splx(s); 851 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 852 ia->ia_addr = oldaddr; 853 IN_IFADDR_WLOCK(); 854 if (ia->ia_addr.sin_family == AF_INET) 855 LIST_INSERT_HEAD(INADDR_HASH( 856 ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 857 else 858 /* 859 * If oldaddr family is not AF_INET (e.g. 860 * interface has been just created) in_control 861 * does not call LIST_REMOVE, and we end up 862 * with bogus ia entries in hash 863 */ 864 LIST_REMOVE(ia, ia_hash); 865 IN_IFADDR_WUNLOCK(); 866 return (error); 867 } 868 } 869 splx(s); 870 if (scrub) { 871 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 872 in_ifscrub(ifp, ia); 873 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 874 } 875 if (IN_CLASSA(i)) 876 ia->ia_netmask = IN_CLASSA_NET; 877 else if (IN_CLASSB(i)) 878 ia->ia_netmask = IN_CLASSB_NET; 879 else 880 ia->ia_netmask = IN_CLASSC_NET; 881 /* 882 * The subnet mask usually includes at least the standard network part, 883 * but may may be smaller in the case of supernetting. 884 * If it is set, we believe it. 885 */ 886 if (ia->ia_subnetmask == 0) { 887 ia->ia_subnetmask = ia->ia_netmask; 888 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 889 } else 890 ia->ia_netmask &= ia->ia_subnetmask; 891 ia->ia_net = i & ia->ia_netmask; 892 ia->ia_subnet = i & ia->ia_subnetmask; 893 in_socktrim(&ia->ia_sockmask); 894#ifdef DEV_CARP 895 /* 896 * XXX: carp(4) does not have interface route 897 */ 898 if (ifp->if_type == IFT_CARP) 899 return (0); 900#endif 901 /* 902 * Add route for the network. 903 */ 904 ia->ia_ifa.ifa_metric = ifp->if_metric; 905 if (ifp->if_flags & IFF_BROADCAST) { 906 ia->ia_broadaddr.sin_addr.s_addr = 907 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 908 ia->ia_netbroadcast.s_addr = 909 htonl(ia->ia_net | ~ ia->ia_netmask); 910 } else if (ifp->if_flags & IFF_LOOPBACK) { 911 ia->ia_dstaddr = ia->ia_addr; 912 flags |= RTF_HOST; 913 } else if (ifp->if_flags & IFF_POINTOPOINT) { 914 if (ia->ia_dstaddr.sin_family != AF_INET) 915 return (0); 916 flags |= RTF_HOST; 917 } 918 if ((error = in_addprefix(ia, flags)) != 0) 919 return (error); 920 921 if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY) 922 return (0); 923 924 /* 925 * add a loopback route to self 926 */ 927 if (V_useloopback && !(ifp->if_flags & IFF_LOOPBACK)) { 928 struct route ia_ro; 929 930 bzero(&ia_ro, sizeof(ia_ro)); 931 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = ia->ia_addr; 932 rtalloc_ign_fib(&ia_ro, 0, 0); 933 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) && 934 (ia_ro.ro_rt->rt_ifp == V_loif)) { 935 RT_LOCK(ia_ro.ro_rt); 936 RT_ADDREF(ia_ro.ro_rt); 937 RTFREE_LOCKED(ia_ro.ro_rt); 938 } else 939 error = ifa_add_loopback_route((struct ifaddr *)ia, 940 (struct sockaddr *)&ia->ia_addr); 941 if (error == 0) 942 ia->ia_flags |= IFA_RTSELF; 943 if (ia_ro.ro_rt != NULL) 944 RTFREE(ia_ro.ro_rt); 945 } 946 947 return (error); 948} 949 950#define rtinitflags(x) \ 951 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 952 ? RTF_HOST : 0) 953/* 954 * Check if we have a route for the given prefix already or add one accordingly. 955 */ 956static int 957in_addprefix(struct in_ifaddr *target, int flags) 958{ 959 struct in_ifaddr *ia; 960 struct in_addr prefix, mask, p, m; 961 int error; 962 963 if ((flags & RTF_HOST) != 0) { 964 prefix = target->ia_dstaddr.sin_addr; 965 mask.s_addr = 0; 966 } else { 967 prefix = target->ia_addr.sin_addr; 968 mask = target->ia_sockmask.sin_addr; 969 prefix.s_addr &= mask.s_addr; 970 } 971 972 IN_IFADDR_RLOCK(); 973 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 974 if (rtinitflags(ia)) { 975 p = ia->ia_addr.sin_addr; 976 977 if (prefix.s_addr != p.s_addr) 978 continue; 979 } else { 980 p = ia->ia_addr.sin_addr; 981 m = ia->ia_sockmask.sin_addr; 982 p.s_addr &= m.s_addr; 983 984 if (prefix.s_addr != p.s_addr || 985 mask.s_addr != m.s_addr) 986 continue; 987 } 988 989 /* 990 * If we got a matching prefix route inserted by other 991 * interface address, we are done here. 992 */ 993 if (ia->ia_flags & IFA_ROUTE) { 994 if (V_sameprefixcarponly && 995 target->ia_ifp->if_type != IFT_CARP && 996 ia->ia_ifp->if_type != IFT_CARP) { 997 IN_IFADDR_RUNLOCK(); 998 return (EEXIST); 999 } else { 1000 struct route pfx_ro; 1001 struct sockaddr_in *pfx_addr; 1002 struct rtentry msg_rt; 1003 1004 /* QL: XXX 1005 * This is a bit questionable because there is no 1006 * additional route entry added for an address alias. 1007 * Therefore this route report is inaccurate. Perhaps 1008 * it's better to supply a empty rtentry as how it 1009 * is done in in_scrubprefix(). 1010 */ 1011 bzero(&pfx_ro, sizeof(pfx_ro)); 1012 pfx_addr = (struct sockaddr_in *)(&pfx_ro.ro_dst); 1013 pfx_addr->sin_len = sizeof(*pfx_addr); 1014 pfx_addr->sin_family = AF_INET; 1015 pfx_addr->sin_addr = prefix; 1016 rtalloc_ign_fib(&pfx_ro, 0, 0); 1017 if (pfx_ro.ro_rt != NULL) { 1018 msg_rt = *pfx_ro.ro_rt; 1019 /* QL: XXX 1020 * Point the gateway to the given interface 1021 * address as if a new prefix route entry has 1022 * been added through the new address alias. 1023 * All other parts of the rtentry is accurate, 1024 * e.g., rt_key, rt_mask, rt_ifp etc. 1025 */ 1026 msg_rt.rt_gateway = 1027 (struct sockaddr *)&ia->ia_addr; 1028 rt_newaddrmsg(RTM_ADD, 1029 (struct ifaddr *)target, 1030 0, &msg_rt); 1031 RTFREE(pfx_ro.ro_rt); 1032 } 1033 1034 IN_IFADDR_RUNLOCK(); 1035 return (0); 1036 } 1037 } 1038 } 1039 IN_IFADDR_RUNLOCK(); 1040 1041 /* 1042 * No-one seem to have this prefix route, so we try to insert it. 1043 */ 1044 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 1045 if (!error) 1046 target->ia_flags |= IFA_ROUTE; 1047 return (error); 1048} 1049 1050extern void arp_ifscrub(struct ifnet *ifp, uint32_t addr); 1051 1052/* 1053 * If there is no other address in the system that can serve a route to the 1054 * same prefix, remove the route. Hand over the route to the new address 1055 * otherwise. 1056 */ 1057static int 1058in_scrubprefix(struct in_ifaddr *target) 1059{ 1060 struct in_ifaddr *ia; 1061 struct in_addr prefix, mask, p; 1062 int error = 0; 1063 struct sockaddr_in prefix0, mask0; 1064 1065 /* 1066 * Remove the loopback route to the interface address. 1067 * The "useloopback" setting is not consulted because if the 1068 * user configures an interface address, turns off this 1069 * setting, and then tries to delete that interface address, 1070 * checking the current setting of "useloopback" would leave 1071 * that interface address loopback route untouched, which 1072 * would be wrong. Therefore the interface address loopback route 1073 * deletion is unconditional. 1074 */ 1075 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) && 1076 !(target->ia_ifp->if_flags & IFF_LOOPBACK) && 1077 (target->ia_flags & IFA_RTSELF)) { 1078 struct route ia_ro; 1079 int freeit = 0; 1080 1081 bzero(&ia_ro, sizeof(ia_ro)); 1082 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = target->ia_addr; 1083 rtalloc_ign_fib(&ia_ro, 0, 0); 1084 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) && 1085 (ia_ro.ro_rt->rt_ifp == V_loif)) { 1086 RT_LOCK(ia_ro.ro_rt); 1087 if (ia_ro.ro_rt->rt_refcnt <= 1) 1088 freeit = 1; 1089 else 1090 RT_REMREF(ia_ro.ro_rt); 1091 RTFREE_LOCKED(ia_ro.ro_rt); 1092 } 1093 if (freeit) 1094 error = ifa_del_loopback_route((struct ifaddr *)target, 1095 (struct sockaddr *)&target->ia_addr); 1096 if (error == 0) 1097 target->ia_flags &= ~IFA_RTSELF; 1098 /* remove arp cache */ 1099 arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr); 1100 } 1101 1102 if ((target->ia_flags & IFA_ROUTE) == 0) { 1103 struct rtentry rt; 1104 1105 /* QL: XXX 1106 * Report a blank rtentry when a route has not been 1107 * installed for the given interface address. 1108 */ 1109 bzero(&rt, sizeof(rt)); 1110 rt_newaddrmsg(RTM_DELETE, 1111 (struct ifaddr *)target, 1112 0, &rt); 1113 return (0); 1114 } 1115 1116 if (rtinitflags(target)) 1117 prefix = target->ia_dstaddr.sin_addr; 1118 else { 1119 prefix = target->ia_addr.sin_addr; 1120 mask = target->ia_sockmask.sin_addr; 1121 prefix.s_addr &= mask.s_addr; 1122 } 1123 1124 IN_IFADDR_RLOCK(); 1125 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1126 if (rtinitflags(ia)) 1127 p = ia->ia_dstaddr.sin_addr; 1128 else { 1129 p = ia->ia_addr.sin_addr; 1130 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1131 } 1132 1133 if (prefix.s_addr != p.s_addr) 1134 continue; 1135 1136 /* 1137 * If we got a matching prefix address, move IFA_ROUTE and 1138 * the route itself to it. Make sure that routing daemons 1139 * get a heads-up. 1140 * 1141 * XXX: a special case for carp(4) interface 1142 */ 1143 if ((ia->ia_flags & IFA_ROUTE) == 0 1144#ifdef DEV_CARP 1145 && (ia->ia_ifp->if_type != IFT_CARP) 1146#endif 1147 ) { 1148 IN_IFADDR_RUNLOCK(); 1149 rtinit(&(target->ia_ifa), (int)RTM_DELETE, 1150 rtinitflags(target)); 1151 target->ia_flags &= ~IFA_ROUTE; 1152 1153 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 1154 rtinitflags(ia) | RTF_UP); 1155 if (error == 0) 1156 ia->ia_flags |= IFA_ROUTE; 1157 return (error); 1158 } 1159 } 1160 IN_IFADDR_RUNLOCK(); 1161 1162 /* 1163 * remove all L2 entries on the given prefix 1164 */ 1165 bzero(&prefix0, sizeof(prefix0)); 1166 prefix0.sin_len = sizeof(prefix0); 1167 prefix0.sin_family = AF_INET; 1168 prefix0.sin_addr.s_addr = target->ia_subnet; 1169 bzero(&mask0, sizeof(mask0)); 1170 mask0.sin_len = sizeof(mask0); 1171 mask0.sin_family = AF_INET; 1172 mask0.sin_addr.s_addr = target->ia_subnetmask; 1173 lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0, 1174 (struct sockaddr *)&mask0); 1175 1176 /* 1177 * As no-one seem to have this prefix, we can remove the route. 1178 */ 1179 rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 1180 target->ia_flags &= ~IFA_ROUTE; 1181 return (0); 1182} 1183 1184#undef rtinitflags 1185 1186/* 1187 * Return 1 if the address might be a local broadcast address. 1188 */ 1189int 1190in_broadcast(struct in_addr in, struct ifnet *ifp) 1191{ 1192 register struct ifaddr *ifa; 1193 u_long t; 1194 1195 if (in.s_addr == INADDR_BROADCAST || 1196 in.s_addr == INADDR_ANY) 1197 return (1); 1198 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1199 return (0); 1200 t = ntohl(in.s_addr); 1201 /* 1202 * Look through the list of addresses for a match 1203 * with a broadcast address. 1204 */ 1205#define ia ((struct in_ifaddr *)ifa) 1206 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1207 if (ifa->ifa_addr->sa_family == AF_INET && 1208 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1209 in.s_addr == ia->ia_netbroadcast.s_addr || 1210 /* 1211 * Check for old-style (host 0) broadcast. 1212 */ 1213 t == ia->ia_subnet || t == ia->ia_net) && 1214 /* 1215 * Check for an all one subnetmask. These 1216 * only exist when an interface gets a secondary 1217 * address. 1218 */ 1219 ia->ia_subnetmask != (u_long)0xffffffff) 1220 return (1); 1221 return (0); 1222#undef ia 1223} 1224 1225/* 1226 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 1227 */ 1228void 1229in_ifdetach(struct ifnet *ifp) 1230{ 1231 1232 in_pcbpurgeif0(&V_ripcbinfo, ifp); 1233 in_pcbpurgeif0(&V_udbinfo, ifp); 1234 in_purgemaddrs(ifp); 1235} 1236 1237/* 1238 * Delete all IPv4 multicast address records, and associated link-layer 1239 * multicast address records, associated with ifp. 1240 * XXX It looks like domifdetach runs AFTER the link layer cleanup. 1241 * XXX This should not race with ifma_protospec being set during 1242 * a new allocation, if it does, we have bigger problems. 1243 */ 1244static void 1245in_purgemaddrs(struct ifnet *ifp) 1246{ 1247 LIST_HEAD(,in_multi) purgeinms; 1248 struct in_multi *inm, *tinm; 1249 struct ifmultiaddr *ifma; 1250 1251 LIST_INIT(&purgeinms); 1252 IN_MULTI_LOCK(); 1253 1254 /* 1255 * Extract list of in_multi associated with the detaching ifp 1256 * which the PF_INET layer is about to release. 1257 * We need to do this as IF_ADDR_LOCK() may be re-acquired 1258 * by code further down. 1259 */ 1260 IF_ADDR_LOCK(ifp); 1261 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1262 if (ifma->ifma_addr->sa_family != AF_INET || 1263 ifma->ifma_protospec == NULL) 1264 continue; 1265#if 0 1266 KASSERT(ifma->ifma_protospec != NULL, 1267 ("%s: ifma_protospec is NULL", __func__)); 1268#endif 1269 inm = (struct in_multi *)ifma->ifma_protospec; 1270 LIST_INSERT_HEAD(&purgeinms, inm, inm_link); 1271 } 1272 IF_ADDR_UNLOCK(ifp); 1273 1274 LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) { 1275 LIST_REMOVE(inm, inm_link); 1276 inm_release_locked(inm); 1277 } 1278 igmp_ifdetach(ifp); 1279 1280 IN_MULTI_UNLOCK(); 1281} 1282 1283#include <net/if_dl.h> 1284#include <netinet/if_ether.h> 1285 1286struct in_llentry { 1287 struct llentry base; 1288 struct sockaddr_in l3_addr4; 1289}; 1290 1291static struct llentry * 1292in_lltable_new(const struct sockaddr *l3addr, u_int flags) 1293{ 1294 struct in_llentry *lle; 1295 1296 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_DONTWAIT | M_ZERO); 1297 if (lle == NULL) /* NB: caller generates msg */ 1298 return NULL; 1299 1300 callout_init(&lle->base.la_timer, CALLOUT_MPSAFE); 1301 /* 1302 * For IPv4 this will trigger "arpresolve" to generate 1303 * an ARP request. 1304 */ 1305 lle->base.la_expire = time_second; /* mark expired */ 1306 lle->l3_addr4 = *(const struct sockaddr_in *)l3addr; 1307 lle->base.lle_refcnt = 1; 1308 LLE_LOCK_INIT(&lle->base); 1309 return &lle->base; 1310} 1311 1312/* 1313 * Deletes an address from the address table. 1314 * This function is called by the timer functions 1315 * such as arptimer() and nd6_llinfo_timer(), and 1316 * the caller does the locking. 1317 */ 1318static void 1319in_lltable_free(struct lltable *llt, struct llentry *lle) 1320{ 1321 LLE_WUNLOCK(lle); 1322 LLE_LOCK_DESTROY(lle); 1323 free(lle, M_LLTABLE); 1324} 1325 1326 1327#define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 1328 (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 ) 1329 1330static void 1331in_lltable_prefix_free(struct lltable *llt, 1332 const struct sockaddr *prefix, 1333 const struct sockaddr *mask) 1334{ 1335 const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix; 1336 const struct sockaddr_in *msk = (const struct sockaddr_in *)mask; 1337 struct llentry *lle, *next; 1338 register int i; 1339 1340 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) { 1341 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 1342 1343 if (IN_ARE_MASKED_ADDR_EQUAL((struct sockaddr_in *)L3_ADDR(lle), 1344 pfx, msk)) { 1345 callout_drain(&lle->la_timer); 1346 LLE_WLOCK(lle); 1347 llentry_free(lle); 1348 } 1349 } 1350 } 1351} 1352 1353 1354static int 1355in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr) 1356{ 1357 struct rtentry *rt; 1358 1359 KASSERT(l3addr->sa_family == AF_INET, 1360 ("sin_family %d", l3addr->sa_family)); 1361 1362 /* XXX rtalloc1 should take a const param */ 1363 rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0); 1364 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || 1365 ((rt->rt_ifp != ifp) && !(flags & LLE_PUB))) { 1366#ifdef DIAGNOSTIC 1367 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n", 1368 inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr)); 1369#endif 1370 if (rt != NULL) 1371 RTFREE_LOCKED(rt); 1372 return (EINVAL); 1373 } 1374 RTFREE_LOCKED(rt); 1375 return 0; 1376} 1377 1378/* 1379 * Return NULL if not found or marked for deletion. 1380 * If found return lle read locked. 1381 */ 1382static struct llentry * 1383in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1384{ 1385 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1386 struct ifnet *ifp = llt->llt_ifp; 1387 struct llentry *lle; 1388 struct llentries *lleh; 1389 u_int hashkey; 1390 1391 IF_AFDATA_LOCK_ASSERT(ifp); 1392 KASSERT(l3addr->sa_family == AF_INET, 1393 ("sin_family %d", l3addr->sa_family)); 1394 1395 hashkey = sin->sin_addr.s_addr; 1396 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 1397 LIST_FOREACH(lle, lleh, lle_next) { 1398 struct sockaddr_in *sa2 = (struct sockaddr_in *)L3_ADDR(lle); 1399 if (lle->la_flags & LLE_DELETED) 1400 continue; 1401 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr) 1402 break; 1403 } 1404 if (lle == NULL) { 1405#ifdef DIAGNOSTIC 1406 if (flags & LLE_DELETE) 1407 log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle); 1408#endif 1409 if (!(flags & LLE_CREATE)) 1410 return (NULL); 1411 /* 1412 * A route that covers the given address must have 1413 * been installed 1st because we are doing a resolution, 1414 * verify this. 1415 */ 1416 if (!(flags & LLE_IFADDR) && 1417 in_lltable_rtcheck(ifp, flags, l3addr) != 0) 1418 goto done; 1419 1420 lle = in_lltable_new(l3addr, flags); 1421 if (lle == NULL) { 1422 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 1423 goto done; 1424 } 1425 lle->la_flags = flags & ~LLE_CREATE; 1426 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 1427 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 1428 lle->la_flags |= (LLE_VALID | LLE_STATIC); 1429 } 1430 1431 lle->lle_tbl = llt; 1432 lle->lle_head = lleh; 1433 LIST_INSERT_HEAD(lleh, lle, lle_next); 1434 } else if (flags & LLE_DELETE) { 1435 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 1436 LLE_WLOCK(lle); 1437 lle->la_flags = LLE_DELETED; 1438 EVENTHANDLER_INVOKE(arp_update_event, lle); 1439 LLE_WUNLOCK(lle); 1440#ifdef DIAGNOSTIC 1441 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 1442#endif 1443 } 1444 lle = (void *)-1; 1445 1446 } 1447 if (LLE_IS_VALID(lle)) { 1448 if (flags & LLE_EXCLUSIVE) 1449 LLE_WLOCK(lle); 1450 else 1451 LLE_RLOCK(lle); 1452 } 1453done: 1454 return (lle); 1455} 1456 1457static int 1458in_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 1459{ 1460#define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle)) 1461 struct ifnet *ifp = llt->llt_ifp; 1462 struct llentry *lle; 1463 /* XXX stack use */ 1464 struct { 1465 struct rt_msghdr rtm; 1466 struct sockaddr_inarp sin; 1467 struct sockaddr_dl sdl; 1468 } arpc; 1469 int error, i; 1470 1471 LLTABLE_LOCK_ASSERT(); 1472 1473 error = 0; 1474 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1475 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 1476 struct sockaddr_dl *sdl; 1477 1478 /* skip deleted entries */ 1479 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 1480 continue; 1481 /* Skip if jailed and not a valid IP of the prison. */ 1482 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 1483 continue; 1484 /* 1485 * produce a msg made of: 1486 * struct rt_msghdr; 1487 * struct sockaddr_inarp; (IPv4) 1488 * struct sockaddr_dl; 1489 */ 1490 bzero(&arpc, sizeof(arpc)); 1491 arpc.rtm.rtm_msglen = sizeof(arpc); 1492 arpc.rtm.rtm_version = RTM_VERSION; 1493 arpc.rtm.rtm_type = RTM_GET; 1494 arpc.rtm.rtm_flags = RTF_UP; 1495 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1496 arpc.sin.sin_family = AF_INET; 1497 arpc.sin.sin_len = sizeof(arpc.sin); 1498 arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr; 1499 1500 /* publish */ 1501 if (lle->la_flags & LLE_PUB) { 1502 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1503 /* proxy only */ 1504 if (lle->la_flags & LLE_PROXY) 1505 arpc.sin.sin_other = SIN_PROXY; 1506 } 1507 1508 sdl = &arpc.sdl; 1509 sdl->sdl_family = AF_LINK; 1510 sdl->sdl_len = sizeof(*sdl); 1511 sdl->sdl_index = ifp->if_index; 1512 sdl->sdl_type = ifp->if_type; 1513 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 1514 sdl->sdl_alen = ifp->if_addrlen; 1515 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1516 } else { 1517 sdl->sdl_alen = 0; 1518 bzero(LLADDR(sdl), ifp->if_addrlen); 1519 } 1520 1521 arpc.rtm.rtm_rmx.rmx_expire = 1522 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1523 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1524 if (lle->la_flags & LLE_STATIC) 1525 arpc.rtm.rtm_flags |= RTF_STATIC; 1526 arpc.rtm.rtm_index = ifp->if_index; 1527 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1528 if (error) 1529 break; 1530 } 1531 } 1532 return error; 1533#undef SIN 1534} 1535 1536void * 1537in_domifattach(struct ifnet *ifp) 1538{ 1539 struct in_ifinfo *ii; 1540 struct lltable *llt; 1541 1542 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); 1543 1544 llt = lltable_init(ifp, AF_INET); 1545 if (llt != NULL) { 1546 llt->llt_new = in_lltable_new; 1547 llt->llt_free = in_lltable_free; 1548 llt->llt_prefix_free = in_lltable_prefix_free; 1549 llt->llt_rtcheck = in_lltable_rtcheck; 1550 llt->llt_lookup = in_lltable_lookup; 1551 llt->llt_dump = in_lltable_dump; 1552 } 1553 ii->ii_llt = llt; 1554 1555 ii->ii_igmp = igmp_domifattach(ifp); 1556 1557 return ii; 1558} 1559 1560void 1561in_domifdetach(struct ifnet *ifp, void *aux) 1562{ 1563 struct in_ifinfo *ii = (struct in_ifinfo *)aux; 1564 1565 igmp_domifdetach(ifp); 1566 lltable_free(ii->ii_llt); 1567 free(ii, M_IFADDR); 1568} 1569