in.c revision 226114
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 226114 2011-10-07 18:01:34Z qingli $"); 35 36#include "opt_mpath.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_arp.h> 53#include <net/if_dl.h> 54#include <net/if_llatbl.h> 55#include <net/if_types.h> 56#include <net/route.h> 57#include <net/vnet.h> 58 59#include <netinet/in.h> 60#include <netinet/in_var.h> 61#include <netinet/in_pcb.h> 62#include <netinet/ip_var.h> 63#include <netinet/igmp_var.h> 64#include <netinet/udp.h> 65#include <netinet/udp_var.h> 66 67static int in_mask2len(struct in_addr *); 68static void in_len2mask(struct in_addr *, int); 69static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, 70 struct ifnet *, struct thread *); 71 72static int in_addprefix(struct in_ifaddr *, int); 73static int in_scrubprefix(struct in_ifaddr *, u_int); 74static void in_socktrim(struct sockaddr_in *); 75static int in_ifinit(struct ifnet *, 76 struct in_ifaddr *, struct sockaddr_in *, int); 77static void in_purgemaddrs(struct ifnet *); 78 79static VNET_DEFINE(int, subnetsarelocal); 80#define V_subnetsarelocal VNET(subnetsarelocal) 81SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 82 &VNET_NAME(subnetsarelocal), 0, 83 "Treat all subnets as directly connected"); 84static VNET_DEFINE(int, sameprefixcarponly); 85#define V_sameprefixcarponly VNET(sameprefixcarponly) 86SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, same_prefix_carp_only, CTLFLAG_RW, 87 &VNET_NAME(sameprefixcarponly), 0, 88 "Refuse to create same prefixes on different interfaces"); 89 90VNET_DECLARE(struct inpcbinfo, ripcbinfo); 91#define V_ripcbinfo VNET(ripcbinfo) 92 93VNET_DECLARE(struct arpstat, arpstat); /* ARP statistics, see if_arp.h */ 94#define V_arpstat VNET(arpstat) 95 96/* 97 * Return 1 if an internet address is for a ``local'' host 98 * (one to which we have a connection). If subnetsarelocal 99 * is true, this includes other subnets of the local net. 100 * Otherwise, it includes only the directly-connected (sub)nets. 101 */ 102int 103in_localaddr(struct in_addr in) 104{ 105 register u_long i = ntohl(in.s_addr); 106 register struct in_ifaddr *ia; 107 108 IN_IFADDR_RLOCK(); 109 if (V_subnetsarelocal) { 110 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 111 if ((i & ia->ia_netmask) == ia->ia_net) { 112 IN_IFADDR_RUNLOCK(); 113 return (1); 114 } 115 } 116 } else { 117 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 118 if ((i & ia->ia_subnetmask) == ia->ia_subnet) { 119 IN_IFADDR_RUNLOCK(); 120 return (1); 121 } 122 } 123 } 124 IN_IFADDR_RUNLOCK(); 125 return (0); 126} 127 128/* 129 * Return 1 if an internet address is for the local host and configured 130 * on one of its interfaces. 131 */ 132int 133in_localip(struct in_addr in) 134{ 135 struct in_ifaddr *ia; 136 137 IN_IFADDR_RLOCK(); 138 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { 139 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) { 140 IN_IFADDR_RUNLOCK(); 141 return (1); 142 } 143 } 144 IN_IFADDR_RUNLOCK(); 145 return (0); 146} 147 148/* 149 * Determine whether an IP address is in a reserved set of addresses 150 * that may not be forwarded, or whether datagrams to that destination 151 * may be forwarded. 152 */ 153int 154in_canforward(struct in_addr in) 155{ 156 register u_long i = ntohl(in.s_addr); 157 register u_long net; 158 159 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i)) 160 return (0); 161 if (IN_CLASSA(i)) { 162 net = i & IN_CLASSA_NET; 163 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 164 return (0); 165 } 166 return (1); 167} 168 169/* 170 * Trim a mask in a sockaddr 171 */ 172static void 173in_socktrim(struct sockaddr_in *ap) 174{ 175 register char *cplim = (char *) &ap->sin_addr; 176 register char *cp = (char *) (&ap->sin_addr + 1); 177 178 ap->sin_len = 0; 179 while (--cp >= cplim) 180 if (*cp) { 181 (ap)->sin_len = cp - (char *) (ap) + 1; 182 break; 183 } 184} 185 186static int 187in_mask2len(mask) 188 struct in_addr *mask; 189{ 190 int x, y; 191 u_char *p; 192 193 p = (u_char *)mask; 194 for (x = 0; x < sizeof(*mask); x++) { 195 if (p[x] != 0xff) 196 break; 197 } 198 y = 0; 199 if (x < sizeof(*mask)) { 200 for (y = 0; y < 8; y++) { 201 if ((p[x] & (0x80 >> y)) == 0) 202 break; 203 } 204 } 205 return (x * 8 + y); 206} 207 208static void 209in_len2mask(struct in_addr *mask, int len) 210{ 211 int i; 212 u_char *p; 213 214 p = (u_char *)mask; 215 bzero(mask, sizeof(*mask)); 216 for (i = 0; i < len / 8; i++) 217 p[i] = 0xff; 218 if (len % 8) 219 p[i] = (0xff00 >> (len % 8)) & 0xff; 220} 221 222/* 223 * Generic internet control operations (ioctl's). 224 * 225 * ifp is NULL if not an interface-specific ioctl. 226 */ 227/* ARGSUSED */ 228int 229in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 230 struct thread *td) 231{ 232 register struct ifreq *ifr = (struct ifreq *)data; 233 register struct in_ifaddr *ia, *iap; 234 register struct ifaddr *ifa; 235 struct in_addr allhosts_addr; 236 struct in_addr dst; 237 struct in_ifinfo *ii; 238 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 239 struct sockaddr_in oldaddr; 240 int error, hostIsNew, iaIsNew, maskIsNew; 241 int iaIsFirst; 242 243 ia = NULL; 244 iaIsFirst = 0; 245 iaIsNew = 0; 246 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 247 248 /* 249 * Filter out ioctls we implement directly; forward the rest on to 250 * in_lifaddr_ioctl() and ifp->if_ioctl(). 251 */ 252 switch (cmd) { 253 case SIOCAIFADDR: 254 case SIOCDIFADDR: 255 case SIOCGIFADDR: 256 case SIOCGIFBRDADDR: 257 case SIOCGIFDSTADDR: 258 case SIOCGIFNETMASK: 259 case SIOCSIFADDR: 260 case SIOCSIFBRDADDR: 261 case SIOCSIFDSTADDR: 262 case SIOCSIFNETMASK: 263 break; 264 265 case SIOCALIFADDR: 266 if (td != NULL) { 267 error = priv_check(td, PRIV_NET_ADDIFADDR); 268 if (error) 269 return (error); 270 } 271 if (ifp == NULL) 272 return (EINVAL); 273 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 274 275 case SIOCDLIFADDR: 276 if (td != NULL) { 277 error = priv_check(td, PRIV_NET_DELIFADDR); 278 if (error) 279 return (error); 280 } 281 if (ifp == NULL) 282 return (EINVAL); 283 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 284 285 case SIOCGLIFADDR: 286 if (ifp == NULL) 287 return (EINVAL); 288 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 289 290 default: 291 if (ifp == NULL || ifp->if_ioctl == NULL) 292 return (EOPNOTSUPP); 293 return ((*ifp->if_ioctl)(ifp, cmd, data)); 294 } 295 296 if (ifp == NULL) 297 return (EADDRNOTAVAIL); 298 299 /* 300 * Security checks before we get involved in any work. 301 */ 302 switch (cmd) { 303 case SIOCAIFADDR: 304 case SIOCSIFADDR: 305 case SIOCSIFBRDADDR: 306 case SIOCSIFNETMASK: 307 case SIOCSIFDSTADDR: 308 if (td != NULL) { 309 error = priv_check(td, PRIV_NET_ADDIFADDR); 310 if (error) 311 return (error); 312 } 313 break; 314 315 case SIOCDIFADDR: 316 if (td != NULL) { 317 error = priv_check(td, PRIV_NET_DELIFADDR); 318 if (error) 319 return (error); 320 } 321 break; 322 } 323 324 /* 325 * Find address for this interface, if it exists. 326 * 327 * If an alias address was specified, find that one instead of the 328 * first one on the interface, if possible. 329 */ 330 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 331 IN_IFADDR_RLOCK(); 332 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) { 333 if (iap->ia_ifp == ifp && 334 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 335 if (td == NULL || prison_check_ip4(td->td_ucred, 336 &dst) == 0) 337 ia = iap; 338 break; 339 } 340 } 341 if (ia != NULL) 342 ifa_ref(&ia->ia_ifa); 343 IN_IFADDR_RUNLOCK(); 344 if (ia == NULL) { 345 IF_ADDR_LOCK(ifp); 346 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 347 iap = ifatoia(ifa); 348 if (iap->ia_addr.sin_family == AF_INET) { 349 if (td != NULL && 350 prison_check_ip4(td->td_ucred, 351 &iap->ia_addr.sin_addr) != 0) 352 continue; 353 ia = iap; 354 break; 355 } 356 } 357 if (ia != NULL) 358 ifa_ref(&ia->ia_ifa); 359 IF_ADDR_UNLOCK(ifp); 360 } 361 if (ia == NULL) 362 iaIsFirst = 1; 363 364 error = 0; 365 switch (cmd) { 366 case SIOCAIFADDR: 367 case SIOCDIFADDR: 368 if (ifra->ifra_addr.sin_family == AF_INET) { 369 struct in_ifaddr *oia; 370 371 IN_IFADDR_RLOCK(); 372 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 373 if (ia->ia_ifp == ifp && 374 ia->ia_addr.sin_addr.s_addr == 375 ifra->ifra_addr.sin_addr.s_addr) 376 break; 377 } 378 if (ia != NULL && ia != oia) 379 ifa_ref(&ia->ia_ifa); 380 if (oia != NULL && ia != oia) 381 ifa_free(&oia->ia_ifa); 382 IN_IFADDR_RUNLOCK(); 383 if ((ifp->if_flags & IFF_POINTOPOINT) 384 && (cmd == SIOCAIFADDR) 385 && (ifra->ifra_dstaddr.sin_addr.s_addr 386 == INADDR_ANY)) { 387 error = EDESTADDRREQ; 388 goto out; 389 } 390 } 391 if (cmd == SIOCDIFADDR && ia == NULL) { 392 error = EADDRNOTAVAIL; 393 goto out; 394 } 395 /* FALLTHROUGH */ 396 case SIOCSIFADDR: 397 case SIOCSIFNETMASK: 398 case SIOCSIFDSTADDR: 399 if (ia == NULL) { 400 ia = (struct in_ifaddr *) 401 malloc(sizeof *ia, M_IFADDR, M_NOWAIT | 402 M_ZERO); 403 if (ia == NULL) { 404 error = ENOBUFS; 405 goto out; 406 } 407 408 ifa = &ia->ia_ifa; 409 ifa_init(ifa); 410 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 411 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 412 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 413 414 ia->ia_sockmask.sin_len = 8; 415 ia->ia_sockmask.sin_family = AF_INET; 416 if (ifp->if_flags & IFF_BROADCAST) { 417 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 418 ia->ia_broadaddr.sin_family = AF_INET; 419 } 420 ia->ia_ifp = ifp; 421 422 ifa_ref(ifa); /* if_addrhead */ 423 IF_ADDR_LOCK(ifp); 424 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 425 IF_ADDR_UNLOCK(ifp); 426 ifa_ref(ifa); /* in_ifaddrhead */ 427 IN_IFADDR_WLOCK(); 428 TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link); 429 IN_IFADDR_WUNLOCK(); 430 iaIsNew = 1; 431 } 432 break; 433 434 case SIOCSIFBRDADDR: 435 case SIOCGIFADDR: 436 case SIOCGIFNETMASK: 437 case SIOCGIFDSTADDR: 438 case SIOCGIFBRDADDR: 439 if (ia == NULL) { 440 error = EADDRNOTAVAIL; 441 goto out; 442 } 443 break; 444 } 445 446 /* 447 * Most paths in this switch return directly or via out. Only paths 448 * that remove the address break in order to hit common removal code. 449 */ 450 switch (cmd) { 451 case SIOCGIFADDR: 452 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 453 goto out; 454 455 case SIOCGIFBRDADDR: 456 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 457 error = EINVAL; 458 goto out; 459 } 460 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 461 goto out; 462 463 case SIOCGIFDSTADDR: 464 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 465 error = EINVAL; 466 goto out; 467 } 468 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 469 goto out; 470 471 case SIOCGIFNETMASK: 472 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 473 goto out; 474 475 case SIOCSIFDSTADDR: 476 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 477 error = EINVAL; 478 goto out; 479 } 480 oldaddr = ia->ia_dstaddr; 481 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 482 if (ifp->if_ioctl != NULL) { 483 error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, 484 (caddr_t)ia); 485 if (error) { 486 ia->ia_dstaddr = oldaddr; 487 goto out; 488 } 489 } 490 if (ia->ia_flags & IFA_ROUTE) { 491 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 492 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 493 ia->ia_ifa.ifa_dstaddr = 494 (struct sockaddr *)&ia->ia_dstaddr; 495 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 496 } 497 goto out; 498 499 case SIOCSIFBRDADDR: 500 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 501 error = EINVAL; 502 goto out; 503 } 504 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 505 goto out; 506 507 case SIOCSIFADDR: 508 error = in_ifinit(ifp, ia, 509 (struct sockaddr_in *) &ifr->ifr_addr, 1); 510 if (error != 0 && iaIsNew) 511 break; 512 if (error == 0) { 513 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 514 if (iaIsFirst && 515 (ifp->if_flags & IFF_MULTICAST) != 0) { 516 error = in_joingroup(ifp, &allhosts_addr, 517 NULL, &ii->ii_allhosts); 518 } 519 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 520 } 521 error = 0; 522 goto out; 523 524 case SIOCSIFNETMASK: 525 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 526 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 527 goto out; 528 529 case SIOCAIFADDR: 530 maskIsNew = 0; 531 hostIsNew = 1; 532 error = 0; 533 if (ia->ia_addr.sin_family == AF_INET) { 534 if (ifra->ifra_addr.sin_len == 0) { 535 ifra->ifra_addr = ia->ia_addr; 536 hostIsNew = 0; 537 } else if (ifra->ifra_addr.sin_addr.s_addr == 538 ia->ia_addr.sin_addr.s_addr) 539 hostIsNew = 0; 540 } 541 if (ifra->ifra_mask.sin_len) { 542 /* 543 * QL: XXX 544 * Need to scrub the prefix here in case 545 * the issued command is SIOCAIFADDR with 546 * the same address, but with a different 547 * prefix length. And if the prefix length 548 * is the same as before, then the call is 549 * un-necessarily executed here. 550 */ 551 in_ifscrub(ifp, ia, LLE_STATIC); 552 ia->ia_sockmask = ifra->ifra_mask; 553 ia->ia_sockmask.sin_family = AF_INET; 554 ia->ia_subnetmask = 555 ntohl(ia->ia_sockmask.sin_addr.s_addr); 556 maskIsNew = 1; 557 } 558 if ((ifp->if_flags & IFF_POINTOPOINT) && 559 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 560 in_ifscrub(ifp, ia, LLE_STATIC); 561 ia->ia_dstaddr = ifra->ifra_dstaddr; 562 maskIsNew = 1; /* We lie; but the effect's the same */ 563 } 564 if (ifra->ifra_addr.sin_family == AF_INET && 565 (hostIsNew || maskIsNew)) 566 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 567 if (error != 0 && iaIsNew) 568 break; 569 570 if ((ifp->if_flags & IFF_BROADCAST) && 571 (ifra->ifra_broadaddr.sin_family == AF_INET)) 572 ia->ia_broadaddr = ifra->ifra_broadaddr; 573 if (error == 0) { 574 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 575 if (iaIsFirst && 576 (ifp->if_flags & IFF_MULTICAST) != 0) { 577 error = in_joingroup(ifp, &allhosts_addr, 578 NULL, &ii->ii_allhosts); 579 } 580 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 581 } 582 goto out; 583 584 case SIOCDIFADDR: 585 /* 586 * in_ifscrub kills the interface route. 587 */ 588 in_ifscrub(ifp, ia, LLE_STATIC); 589 590 /* 591 * in_ifadown gets rid of all the rest of 592 * the routes. This is not quite the right 593 * thing to do, but at least if we are running 594 * a routing process they will come back. 595 */ 596 in_ifadown(&ia->ia_ifa, 1); 597 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 598 error = 0; 599 break; 600 601 default: 602 panic("in_control: unsupported ioctl"); 603 } 604 605 IF_ADDR_LOCK(ifp); 606 /* Re-check that ia is still part of the list. */ 607 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 608 if (ifa == &ia->ia_ifa) 609 break; 610 } 611 if (ifa == NULL) { 612 /* 613 * If we lost the race with another thread, there is no need to 614 * try it again for the next loop as there is no other exit 615 * path between here and out. 616 */ 617 IF_ADDR_UNLOCK(ifp); 618 error = EADDRNOTAVAIL; 619 goto out; 620 } 621 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 622 IF_ADDR_UNLOCK(ifp); 623 ifa_free(&ia->ia_ifa); /* if_addrhead */ 624 625 IN_IFADDR_WLOCK(); 626 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link); 627 if (ia->ia_addr.sin_family == AF_INET) { 628 struct in_ifaddr *if_ia; 629 630 LIST_REMOVE(ia, ia_hash); 631 IN_IFADDR_WUNLOCK(); 632 /* 633 * If this is the last IPv4 address configured on this 634 * interface, leave the all-hosts group. 635 * No state-change report need be transmitted. 636 */ 637 if_ia = NULL; 638 IFP_TO_IA(ifp, if_ia); 639 if (if_ia == NULL) { 640 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 641 IN_MULTI_LOCK(); 642 if (ii->ii_allhosts) { 643 (void)in_leavegroup_locked(ii->ii_allhosts, 644 NULL); 645 ii->ii_allhosts = NULL; 646 } 647 IN_MULTI_UNLOCK(); 648 } else 649 ifa_free(&if_ia->ia_ifa); 650 } else 651 IN_IFADDR_WUNLOCK(); 652 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 653out: 654 if (ia != NULL) 655 ifa_free(&ia->ia_ifa); 656 return (error); 657} 658 659/* 660 * SIOC[GAD]LIFADDR. 661 * SIOCGLIFADDR: get first address. (?!?) 662 * SIOCGLIFADDR with IFLR_PREFIX: 663 * get first address that matches the specified prefix. 664 * SIOCALIFADDR: add the specified address. 665 * SIOCALIFADDR with IFLR_PREFIX: 666 * EINVAL since we can't deduce hostid part of the address. 667 * SIOCDLIFADDR: delete the specified address. 668 * SIOCDLIFADDR with IFLR_PREFIX: 669 * delete the first address that matches the specified prefix. 670 * return values: 671 * EINVAL on invalid parameters 672 * EADDRNOTAVAIL on prefix match failed/specified address not found 673 * other values may be returned from in_ioctl() 674 */ 675static int 676in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 677 struct ifnet *ifp, struct thread *td) 678{ 679 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 680 struct ifaddr *ifa; 681 682 /* sanity checks */ 683 if (data == NULL || ifp == NULL) { 684 panic("invalid argument to in_lifaddr_ioctl"); 685 /*NOTRECHED*/ 686 } 687 688 switch (cmd) { 689 case SIOCGLIFADDR: 690 /* address must be specified on GET with IFLR_PREFIX */ 691 if ((iflr->flags & IFLR_PREFIX) == 0) 692 break; 693 /*FALLTHROUGH*/ 694 case SIOCALIFADDR: 695 case SIOCDLIFADDR: 696 /* address must be specified on ADD and DELETE */ 697 if (iflr->addr.ss_family != AF_INET) 698 return (EINVAL); 699 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 700 return (EINVAL); 701 /* XXX need improvement */ 702 if (iflr->dstaddr.ss_family 703 && iflr->dstaddr.ss_family != AF_INET) 704 return (EINVAL); 705 if (iflr->dstaddr.ss_family 706 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 707 return (EINVAL); 708 break; 709 default: /*shouldn't happen*/ 710 return (EOPNOTSUPP); 711 } 712 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 713 return (EINVAL); 714 715 switch (cmd) { 716 case SIOCALIFADDR: 717 { 718 struct in_aliasreq ifra; 719 720 if (iflr->flags & IFLR_PREFIX) 721 return (EINVAL); 722 723 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 724 bzero(&ifra, sizeof(ifra)); 725 bcopy(iflr->iflr_name, ifra.ifra_name, 726 sizeof(ifra.ifra_name)); 727 728 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 729 730 if (iflr->dstaddr.ss_family) { /*XXX*/ 731 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 732 iflr->dstaddr.ss_len); 733 } 734 735 ifra.ifra_mask.sin_family = AF_INET; 736 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 737 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 738 739 return (in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td)); 740 } 741 case SIOCGLIFADDR: 742 case SIOCDLIFADDR: 743 { 744 struct in_ifaddr *ia; 745 struct in_addr mask, candidate, match; 746 struct sockaddr_in *sin; 747 748 bzero(&mask, sizeof(mask)); 749 bzero(&match, sizeof(match)); 750 if (iflr->flags & IFLR_PREFIX) { 751 /* lookup a prefix rather than address. */ 752 in_len2mask(&mask, iflr->prefixlen); 753 754 sin = (struct sockaddr_in *)&iflr->addr; 755 match.s_addr = sin->sin_addr.s_addr; 756 match.s_addr &= mask.s_addr; 757 758 /* if you set extra bits, that's wrong */ 759 if (match.s_addr != sin->sin_addr.s_addr) 760 return (EINVAL); 761 762 } else { 763 /* on getting an address, take the 1st match */ 764 /* on deleting an address, do exact match */ 765 if (cmd != SIOCGLIFADDR) { 766 in_len2mask(&mask, 32); 767 sin = (struct sockaddr_in *)&iflr->addr; 768 match.s_addr = sin->sin_addr.s_addr; 769 } 770 } 771 772 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 773 if (ifa->ifa_addr->sa_family != AF_INET6) 774 continue; 775 if (match.s_addr == 0) 776 break; 777 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 778 candidate.s_addr &= mask.s_addr; 779 if (candidate.s_addr == match.s_addr) 780 break; 781 } 782 if (ifa == NULL) 783 return (EADDRNOTAVAIL); 784 ia = (struct in_ifaddr *)ifa; 785 786 if (cmd == SIOCGLIFADDR) { 787 /* fill in the if_laddrreq structure */ 788 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 789 790 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 791 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 792 ia->ia_dstaddr.sin_len); 793 } else 794 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 795 796 iflr->prefixlen = 797 in_mask2len(&ia->ia_sockmask.sin_addr); 798 799 iflr->flags = 0; /*XXX*/ 800 801 return (0); 802 } else { 803 struct in_aliasreq ifra; 804 805 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 806 bzero(&ifra, sizeof(ifra)); 807 bcopy(iflr->iflr_name, ifra.ifra_name, 808 sizeof(ifra.ifra_name)); 809 810 bcopy(&ia->ia_addr, &ifra.ifra_addr, 811 ia->ia_addr.sin_len); 812 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 813 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 814 ia->ia_dstaddr.sin_len); 815 } 816 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 817 ia->ia_sockmask.sin_len); 818 819 return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 820 ifp, td)); 821 } 822 } 823 } 824 825 return (EOPNOTSUPP); /*just for safety*/ 826} 827 828/* 829 * Delete any existing route for an interface. 830 */ 831void 832in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia, u_int flags) 833{ 834 835 in_scrubprefix(ia, flags); 836} 837 838/* 839 * Initialize an interface's internet address 840 * and routing table entry. 841 */ 842static int 843in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, 844 int scrub) 845{ 846 register u_long i = ntohl(sin->sin_addr.s_addr); 847 struct sockaddr_in oldaddr; 848 int s = splimp(), flags = RTF_UP, error = 0; 849 850 oldaddr = ia->ia_addr; 851 if (oldaddr.sin_family == AF_INET) 852 LIST_REMOVE(ia, ia_hash); 853 ia->ia_addr = *sin; 854 if (ia->ia_addr.sin_family == AF_INET) { 855 IN_IFADDR_WLOCK(); 856 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 857 ia, ia_hash); 858 IN_IFADDR_WUNLOCK(); 859 } 860 /* 861 * Give the interface a chance to initialize 862 * if this is its first address, 863 * and to validate the address if necessary. 864 */ 865 if (ifp->if_ioctl != NULL) { 866 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 867 if (error) { 868 splx(s); 869 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 870 ia->ia_addr = oldaddr; 871 IN_IFADDR_WLOCK(); 872 if (ia->ia_addr.sin_family == AF_INET) 873 LIST_INSERT_HEAD(INADDR_HASH( 874 ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 875 else 876 /* 877 * If oldaddr family is not AF_INET (e.g. 878 * interface has been just created) in_control 879 * does not call LIST_REMOVE, and we end up 880 * with bogus ia entries in hash 881 */ 882 LIST_REMOVE(ia, ia_hash); 883 IN_IFADDR_WUNLOCK(); 884 return (error); 885 } 886 } 887 splx(s); 888 if (scrub) { 889 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 890 in_ifscrub(ifp, ia, LLE_STATIC); 891 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 892 } 893 if (IN_CLASSA(i)) 894 ia->ia_netmask = IN_CLASSA_NET; 895 else if (IN_CLASSB(i)) 896 ia->ia_netmask = IN_CLASSB_NET; 897 else 898 ia->ia_netmask = IN_CLASSC_NET; 899 /* 900 * The subnet mask usually includes at least the standard network part, 901 * but may may be smaller in the case of supernetting. 902 * If it is set, we believe it. 903 */ 904 if (ia->ia_subnetmask == 0) { 905 ia->ia_subnetmask = ia->ia_netmask; 906 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 907 } else 908 ia->ia_netmask &= ia->ia_subnetmask; 909 ia->ia_net = i & ia->ia_netmask; 910 ia->ia_subnet = i & ia->ia_subnetmask; 911 in_socktrim(&ia->ia_sockmask); 912 /* 913 * XXX: carp(4) does not have interface route 914 */ 915 if (ifp->if_type == IFT_CARP) 916 return (0); 917 /* 918 * Add route for the network. 919 */ 920 ia->ia_ifa.ifa_metric = ifp->if_metric; 921 if (ifp->if_flags & IFF_BROADCAST) { 922 ia->ia_broadaddr.sin_addr.s_addr = 923 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 924 ia->ia_netbroadcast.s_addr = 925 htonl(ia->ia_net | ~ ia->ia_netmask); 926 } else if (ifp->if_flags & IFF_LOOPBACK) { 927 ia->ia_dstaddr = ia->ia_addr; 928 flags |= RTF_HOST; 929 } else if (ifp->if_flags & IFF_POINTOPOINT) { 930 if (ia->ia_dstaddr.sin_family != AF_INET) 931 return (0); 932 flags |= RTF_HOST; 933 } 934 if ((error = in_addprefix(ia, flags)) != 0) 935 return (error); 936 937 if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY) 938 return (0); 939 940 if (ifp->if_flags & IFF_POINTOPOINT) { 941 if (ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 942 return (0); 943 } 944 945 946 /* 947 * add a loopback route to self 948 */ 949 if (V_useloopback && !(ifp->if_flags & IFF_LOOPBACK)) { 950 struct route ia_ro; 951 952 bzero(&ia_ro, sizeof(ia_ro)); 953 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = ia->ia_addr; 954 rtalloc_ign_fib(&ia_ro, 0, 0); 955 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) && 956 (ia_ro.ro_rt->rt_ifp == V_loif)) { 957 RT_LOCK(ia_ro.ro_rt); 958 RT_ADDREF(ia_ro.ro_rt); 959 RTFREE_LOCKED(ia_ro.ro_rt); 960 } else 961 error = ifa_add_loopback_route((struct ifaddr *)ia, 962 (struct sockaddr *)&ia->ia_addr); 963 if (error == 0) 964 ia->ia_flags |= IFA_RTSELF; 965 if (ia_ro.ro_rt != NULL) 966 RTFREE(ia_ro.ro_rt); 967 } 968 969 return (error); 970} 971 972#define rtinitflags(x) \ 973 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 974 ? RTF_HOST : 0) 975 976/* 977 * Generate a routing message when inserting or deleting 978 * an interface address alias. 979 */ 980static void in_addralias_rtmsg(int cmd, struct in_addr *prefix, 981 struct in_ifaddr *target) 982{ 983 struct route pfx_ro; 984 struct sockaddr_in *pfx_addr; 985 struct rtentry msg_rt; 986 987 /* QL: XXX 988 * This is a bit questionable because there is no 989 * additional route entry added/deleted for an address 990 * alias. Therefore this route report is inaccurate. 991 */ 992 bzero(&pfx_ro, sizeof(pfx_ro)); 993 pfx_addr = (struct sockaddr_in *)(&pfx_ro.ro_dst); 994 pfx_addr->sin_len = sizeof(*pfx_addr); 995 pfx_addr->sin_family = AF_INET; 996 pfx_addr->sin_addr = *prefix; 997 rtalloc_ign_fib(&pfx_ro, 0, 0); 998 if (pfx_ro.ro_rt != NULL) { 999 msg_rt = *pfx_ro.ro_rt; 1000 1001 /* QL: XXX 1002 * Point the gateway to the new interface 1003 * address as if a new prefix route entry has 1004 * been added through the new address alias. 1005 * All other parts of the rtentry is accurate, 1006 * e.g., rt_key, rt_mask, rt_ifp etc. 1007 */ 1008 msg_rt.rt_gateway = 1009 (struct sockaddr *)&target->ia_addr; 1010 rt_newaddrmsg(cmd, 1011 (struct ifaddr *)target, 1012 0, &msg_rt); 1013 RTFREE(pfx_ro.ro_rt); 1014 } 1015 return; 1016} 1017 1018/* 1019 * Check if we have a route for the given prefix already or add one accordingly. 1020 */ 1021static int 1022in_addprefix(struct in_ifaddr *target, int flags) 1023{ 1024 struct in_ifaddr *ia; 1025 struct in_addr prefix, mask, p, m; 1026 int error; 1027 1028 if ((flags & RTF_HOST) != 0) { 1029 prefix = target->ia_dstaddr.sin_addr; 1030 mask.s_addr = 0; 1031 } else { 1032 prefix = target->ia_addr.sin_addr; 1033 mask = target->ia_sockmask.sin_addr; 1034 prefix.s_addr &= mask.s_addr; 1035 } 1036 1037 IN_IFADDR_RLOCK(); 1038 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1039 if (rtinitflags(ia)) { 1040 p = ia->ia_dstaddr.sin_addr; 1041 1042 if (prefix.s_addr != p.s_addr) 1043 continue; 1044 } else { 1045 p = ia->ia_addr.sin_addr; 1046 m = ia->ia_sockmask.sin_addr; 1047 p.s_addr &= m.s_addr; 1048 1049 if (prefix.s_addr != p.s_addr || 1050 mask.s_addr != m.s_addr) 1051 continue; 1052 } 1053 1054 /* 1055 * If we got a matching prefix route inserted by other 1056 * interface address, we are done here. 1057 */ 1058 if (ia->ia_flags & IFA_ROUTE) { 1059#ifdef RADIX_MPATH 1060 if (ia->ia_addr.sin_addr.s_addr == 1061 target->ia_addr.sin_addr.s_addr) { 1062 IN_IFADDR_RUNLOCK(); 1063 return (EEXIST); 1064 } else 1065 break; 1066#endif 1067 if (V_sameprefixcarponly && 1068 target->ia_ifp->if_type != IFT_CARP && 1069 ia->ia_ifp->if_type != IFT_CARP) { 1070 IN_IFADDR_RUNLOCK(); 1071 return (EEXIST); 1072 } else { 1073 in_addralias_rtmsg(RTM_ADD, &prefix, target); 1074 IN_IFADDR_RUNLOCK(); 1075 return (0); 1076 } 1077 } 1078 } 1079 IN_IFADDR_RUNLOCK(); 1080 1081 /* 1082 * No-one seem to have this prefix route, so we try to insert it. 1083 */ 1084 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 1085 if (!error) 1086 target->ia_flags |= IFA_ROUTE; 1087 return (error); 1088} 1089 1090extern void arp_ifscrub(struct ifnet *ifp, uint32_t addr); 1091 1092/* 1093 * If there is no other address in the system that can serve a route to the 1094 * same prefix, remove the route. Hand over the route to the new address 1095 * otherwise. 1096 */ 1097static int 1098in_scrubprefix(struct in_ifaddr *target, u_int flags) 1099{ 1100 struct in_ifaddr *ia; 1101 struct in_addr prefix, mask, p; 1102 int error = 0; 1103 struct sockaddr_in prefix0, mask0; 1104 1105 /* 1106 * Remove the loopback route to the interface address. 1107 * The "useloopback" setting is not consulted because if the 1108 * user configures an interface address, turns off this 1109 * setting, and then tries to delete that interface address, 1110 * checking the current setting of "useloopback" would leave 1111 * that interface address loopback route untouched, which 1112 * would be wrong. Therefore the interface address loopback route 1113 * deletion is unconditional. 1114 */ 1115 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) && 1116 !(target->ia_ifp->if_flags & IFF_LOOPBACK) && 1117 (target->ia_flags & IFA_RTSELF)) { 1118 struct route ia_ro; 1119 int freeit = 0; 1120 1121 bzero(&ia_ro, sizeof(ia_ro)); 1122 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = target->ia_addr; 1123 rtalloc_ign_fib(&ia_ro, 0, 0); 1124 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) && 1125 (ia_ro.ro_rt->rt_ifp == V_loif)) { 1126 RT_LOCK(ia_ro.ro_rt); 1127 if (ia_ro.ro_rt->rt_refcnt <= 1) 1128 freeit = 1; 1129 else if (flags & LLE_STATIC) { 1130 RT_REMREF(ia_ro.ro_rt); 1131 target->ia_flags &= ~IFA_RTSELF; 1132 } 1133 RTFREE_LOCKED(ia_ro.ro_rt); 1134 } 1135 if (freeit && (flags & LLE_STATIC)) { 1136 error = ifa_del_loopback_route((struct ifaddr *)target, 1137 (struct sockaddr *)&target->ia_addr); 1138 if (error == 0) 1139 target->ia_flags &= ~IFA_RTSELF; 1140 } 1141 if (flags & LLE_STATIC) 1142 /* remove arp cache */ 1143 arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr); 1144 } 1145 1146 if (rtinitflags(target)) 1147 prefix = target->ia_dstaddr.sin_addr; 1148 else { 1149 prefix = target->ia_addr.sin_addr; 1150 mask = target->ia_sockmask.sin_addr; 1151 prefix.s_addr &= mask.s_addr; 1152 } 1153 1154 if ((target->ia_flags & IFA_ROUTE) == 0) { 1155 in_addralias_rtmsg(RTM_DELETE, &prefix, target); 1156 return (0); 1157 } 1158 1159 IN_IFADDR_RLOCK(); 1160 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1161 if (rtinitflags(ia)) 1162 p = ia->ia_dstaddr.sin_addr; 1163 else { 1164 p = ia->ia_addr.sin_addr; 1165 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1166 } 1167 1168 if ((prefix.s_addr != p.s_addr) || 1169 !(ia->ia_ifp->if_flags & IFF_UP)) 1170 continue; 1171 1172 /* 1173 * If we got a matching prefix address, move IFA_ROUTE and 1174 * the route itself to it. Make sure that routing daemons 1175 * get a heads-up. 1176 * 1177 * XXX: a special case for carp(4) interface - this should 1178 * be more generally specified as an interface that 1179 * doesn't support such action. 1180 */ 1181 if ((ia->ia_flags & IFA_ROUTE) == 0 1182 && (ia->ia_ifp->if_type != IFT_CARP)) { 1183 ifa_ref(&ia->ia_ifa); 1184 IN_IFADDR_RUNLOCK(); 1185 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, 1186 rtinitflags(target)); 1187 if (error == 0) 1188 target->ia_flags &= ~IFA_ROUTE; 1189 else 1190 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n", 1191 error); 1192 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 1193 rtinitflags(ia) | RTF_UP); 1194 if (error == 0) 1195 ia->ia_flags |= IFA_ROUTE; 1196 else 1197 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n", 1198 error); 1199 ifa_free(&ia->ia_ifa); 1200 return (error); 1201 } 1202 } 1203 IN_IFADDR_RUNLOCK(); 1204 1205 /* 1206 * remove all L2 entries on the given prefix 1207 */ 1208 bzero(&prefix0, sizeof(prefix0)); 1209 prefix0.sin_len = sizeof(prefix0); 1210 prefix0.sin_family = AF_INET; 1211 prefix0.sin_addr.s_addr = target->ia_subnet; 1212 bzero(&mask0, sizeof(mask0)); 1213 mask0.sin_len = sizeof(mask0); 1214 mask0.sin_family = AF_INET; 1215 mask0.sin_addr.s_addr = target->ia_subnetmask; 1216 lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0, 1217 (struct sockaddr *)&mask0, flags); 1218 1219 /* 1220 * As no-one seem to have this prefix, we can remove the route. 1221 */ 1222 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 1223 if (error == 0) 1224 target->ia_flags &= ~IFA_ROUTE; 1225 else 1226 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error); 1227 return (error); 1228} 1229 1230#undef rtinitflags 1231 1232/* 1233 * Return 1 if the address might be a local broadcast address. 1234 */ 1235int 1236in_broadcast(struct in_addr in, struct ifnet *ifp) 1237{ 1238 register struct ifaddr *ifa; 1239 u_long t; 1240 1241 if (in.s_addr == INADDR_BROADCAST || 1242 in.s_addr == INADDR_ANY) 1243 return (1); 1244 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1245 return (0); 1246 t = ntohl(in.s_addr); 1247 /* 1248 * Look through the list of addresses for a match 1249 * with a broadcast address. 1250 */ 1251#define ia ((struct in_ifaddr *)ifa) 1252 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1253 if (ifa->ifa_addr->sa_family == AF_INET && 1254 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1255 in.s_addr == ia->ia_netbroadcast.s_addr || 1256 /* 1257 * Check for old-style (host 0) broadcast. 1258 */ 1259 t == ia->ia_subnet || t == ia->ia_net) && 1260 /* 1261 * Check for an all one subnetmask. These 1262 * only exist when an interface gets a secondary 1263 * address. 1264 */ 1265 ia->ia_subnetmask != (u_long)0xffffffff) 1266 return (1); 1267 return (0); 1268#undef ia 1269} 1270 1271/* 1272 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 1273 */ 1274void 1275in_ifdetach(struct ifnet *ifp) 1276{ 1277 1278 in_pcbpurgeif0(&V_ripcbinfo, ifp); 1279 in_pcbpurgeif0(&V_udbinfo, ifp); 1280 in_purgemaddrs(ifp); 1281} 1282 1283/* 1284 * Delete all IPv4 multicast address records, and associated link-layer 1285 * multicast address records, associated with ifp. 1286 * XXX It looks like domifdetach runs AFTER the link layer cleanup. 1287 * XXX This should not race with ifma_protospec being set during 1288 * a new allocation, if it does, we have bigger problems. 1289 */ 1290static void 1291in_purgemaddrs(struct ifnet *ifp) 1292{ 1293 LIST_HEAD(,in_multi) purgeinms; 1294 struct in_multi *inm, *tinm; 1295 struct ifmultiaddr *ifma; 1296 1297 LIST_INIT(&purgeinms); 1298 IN_MULTI_LOCK(); 1299 1300 /* 1301 * Extract list of in_multi associated with the detaching ifp 1302 * which the PF_INET layer is about to release. 1303 * We need to do this as IF_ADDR_LOCK() may be re-acquired 1304 * by code further down. 1305 */ 1306 IF_ADDR_LOCK(ifp); 1307 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1308 if (ifma->ifma_addr->sa_family != AF_INET || 1309 ifma->ifma_protospec == NULL) 1310 continue; 1311#if 0 1312 KASSERT(ifma->ifma_protospec != NULL, 1313 ("%s: ifma_protospec is NULL", __func__)); 1314#endif 1315 inm = (struct in_multi *)ifma->ifma_protospec; 1316 LIST_INSERT_HEAD(&purgeinms, inm, inm_link); 1317 } 1318 IF_ADDR_UNLOCK(ifp); 1319 1320 LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) { 1321 LIST_REMOVE(inm, inm_link); 1322 inm_release_locked(inm); 1323 } 1324 igmp_ifdetach(ifp); 1325 1326 IN_MULTI_UNLOCK(); 1327} 1328 1329#include <net/if_dl.h> 1330#include <netinet/if_ether.h> 1331 1332struct in_llentry { 1333 struct llentry base; 1334 struct sockaddr_in l3_addr4; 1335}; 1336 1337static struct llentry * 1338in_lltable_new(const struct sockaddr *l3addr, u_int flags) 1339{ 1340 struct in_llentry *lle; 1341 1342 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_DONTWAIT | M_ZERO); 1343 if (lle == NULL) /* NB: caller generates msg */ 1344 return NULL; 1345 1346 callout_init(&lle->base.la_timer, CALLOUT_MPSAFE); 1347 /* 1348 * For IPv4 this will trigger "arpresolve" to generate 1349 * an ARP request. 1350 */ 1351 lle->base.la_expire = time_uptime; /* mark expired */ 1352 lle->l3_addr4 = *(const struct sockaddr_in *)l3addr; 1353 lle->base.lle_refcnt = 1; 1354 LLE_LOCK_INIT(&lle->base); 1355 return &lle->base; 1356} 1357 1358/* 1359 * Deletes an address from the address table. 1360 * This function is called by the timer functions 1361 * such as arptimer() and nd6_llinfo_timer(), and 1362 * the caller does the locking. 1363 */ 1364static void 1365in_lltable_free(struct lltable *llt, struct llentry *lle) 1366{ 1367 LLE_WUNLOCK(lle); 1368 LLE_LOCK_DESTROY(lle); 1369 free(lle, M_LLTABLE); 1370} 1371 1372 1373#define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 1374 (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 ) 1375 1376static void 1377in_lltable_prefix_free(struct lltable *llt, 1378 const struct sockaddr *prefix, 1379 const struct sockaddr *mask, 1380 u_int flags) 1381{ 1382 const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix; 1383 const struct sockaddr_in *msk = (const struct sockaddr_in *)mask; 1384 struct llentry *lle, *next; 1385 register int i; 1386 size_t pkts_dropped; 1387 1388 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) { 1389 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 1390 1391 /* 1392 * (flags & LLE_STATIC) means deleting all entries 1393 * including static ARP entries 1394 */ 1395 if (IN_ARE_MASKED_ADDR_EQUAL((struct sockaddr_in *)L3_ADDR(lle), 1396 pfx, msk) && 1397 ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) { 1398 int canceled; 1399 1400 canceled = callout_drain(&lle->la_timer); 1401 LLE_WLOCK(lle); 1402 if (canceled) 1403 LLE_REMREF(lle); 1404 pkts_dropped = llentry_free(lle); 1405 ARPSTAT_ADD(dropped, pkts_dropped); 1406 } 1407 } 1408 } 1409} 1410 1411 1412static int 1413in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr) 1414{ 1415 struct rtentry *rt; 1416 struct ifnet *xifp; 1417 int error = 0; 1418 1419 KASSERT(l3addr->sa_family == AF_INET, 1420 ("sin_family %d", l3addr->sa_family)); 1421 1422 /* XXX rtalloc1 should take a const param */ 1423 rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0); 1424 1425 if (rt == NULL) 1426 return (EINVAL); 1427 1428 /* 1429 * If the gateway for an existing host route matches the target L3 1430 * address, which is a special route inserted by some implementation 1431 * such as MANET, and the interface is of the correct type, then 1432 * allow for ARP to proceed. 1433 */ 1434 if (rt->rt_flags & (RTF_GATEWAY | RTF_HOST)) { 1435 xifp = rt->rt_ifp; 1436 1437 if (xifp && (xifp->if_type != IFT_ETHER || 1438 (xifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0)) 1439 error = EINVAL; 1440 1441 if (memcmp(rt->rt_gateway->sa_data, l3addr->sa_data, 1442 sizeof(in_addr_t)) != 0) 1443 error = EINVAL; 1444 } 1445 1446 if (rt->rt_flags & RTF_GATEWAY) { 1447 RTFREE_LOCKED(rt); 1448 return (EINVAL); 1449 } 1450 1451 /* 1452 * Make sure that at least the destination address is covered 1453 * by the route. This is for handling the case where 2 or more 1454 * interfaces have the same prefix. An incoming packet arrives 1455 * on one interface and the corresponding outgoing packet leaves 1456 * another interface. 1457 * 1458 */ 1459 if (rt->rt_ifp != ifp) { 1460 char *sa, *mask, *addr, *lim; 1461 int len; 1462 1463 sa = (char *)rt_key(rt); 1464 mask = (char *)rt_mask(rt); 1465 addr = (char *)__DECONST(struct sockaddr *, l3addr); 1466 len = ((struct sockaddr_in *)__DECONST(struct sockaddr *, l3addr))->sin_len; 1467 lim = addr + len; 1468 1469 for ( ; addr < lim; sa++, mask++, addr++) { 1470 if ((*sa ^ *addr) & *mask) { 1471 error = EINVAL; 1472#ifdef DIAGNOSTIC 1473 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n", 1474 inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr)); 1475#endif 1476 break; 1477 } 1478 } 1479 } 1480 1481 RTFREE_LOCKED(rt); 1482 return (error); 1483} 1484 1485/* 1486 * Return NULL if not found or marked for deletion. 1487 * If found return lle read locked. 1488 */ 1489static struct llentry * 1490in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1491{ 1492 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1493 struct ifnet *ifp = llt->llt_ifp; 1494 struct llentry *lle; 1495 struct llentries *lleh; 1496 u_int hashkey; 1497 1498 IF_AFDATA_LOCK_ASSERT(ifp); 1499 KASSERT(l3addr->sa_family == AF_INET, 1500 ("sin_family %d", l3addr->sa_family)); 1501 1502 hashkey = sin->sin_addr.s_addr; 1503 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 1504 LIST_FOREACH(lle, lleh, lle_next) { 1505 struct sockaddr_in *sa2 = (struct sockaddr_in *)L3_ADDR(lle); 1506 if (lle->la_flags & LLE_DELETED) 1507 continue; 1508 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr) 1509 break; 1510 } 1511 if (lle == NULL) { 1512#ifdef DIAGNOSTIC 1513 if (flags & LLE_DELETE) 1514 log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle); 1515#endif 1516 if (!(flags & LLE_CREATE)) 1517 return (NULL); 1518 /* 1519 * A route that covers the given address must have 1520 * been installed 1st because we are doing a resolution, 1521 * verify this. 1522 */ 1523 if (!(flags & LLE_IFADDR) && 1524 in_lltable_rtcheck(ifp, flags, l3addr) != 0) 1525 goto done; 1526 1527 lle = in_lltable_new(l3addr, flags); 1528 if (lle == NULL) { 1529 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 1530 goto done; 1531 } 1532 lle->la_flags = flags & ~LLE_CREATE; 1533 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 1534 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 1535 lle->la_flags |= (LLE_VALID | LLE_STATIC); 1536 } 1537 1538 lle->lle_tbl = llt; 1539 lle->lle_head = lleh; 1540 LIST_INSERT_HEAD(lleh, lle, lle_next); 1541 } else if (flags & LLE_DELETE) { 1542 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 1543 LLE_WLOCK(lle); 1544 lle->la_flags = LLE_DELETED; 1545 EVENTHANDLER_INVOKE(arp_update_event, lle); 1546 LLE_WUNLOCK(lle); 1547#ifdef DIAGNOSTIC 1548 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 1549#endif 1550 } 1551 lle = (void *)-1; 1552 1553 } 1554 if (LLE_IS_VALID(lle)) { 1555 if (flags & LLE_EXCLUSIVE) 1556 LLE_WLOCK(lle); 1557 else 1558 LLE_RLOCK(lle); 1559 } 1560done: 1561 return (lle); 1562} 1563 1564static int 1565in_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 1566{ 1567#define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle)) 1568 struct ifnet *ifp = llt->llt_ifp; 1569 struct llentry *lle; 1570 /* XXX stack use */ 1571 struct { 1572 struct rt_msghdr rtm; 1573 struct sockaddr_inarp sin; 1574 struct sockaddr_dl sdl; 1575 } arpc; 1576 int error, i; 1577 1578 LLTABLE_LOCK_ASSERT(); 1579 1580 error = 0; 1581 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1582 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 1583 struct sockaddr_dl *sdl; 1584 1585 /* skip deleted entries */ 1586 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 1587 continue; 1588 /* Skip if jailed and not a valid IP of the prison. */ 1589 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 1590 continue; 1591 /* 1592 * produce a msg made of: 1593 * struct rt_msghdr; 1594 * struct sockaddr_inarp; (IPv4) 1595 * struct sockaddr_dl; 1596 */ 1597 bzero(&arpc, sizeof(arpc)); 1598 arpc.rtm.rtm_msglen = sizeof(arpc); 1599 arpc.rtm.rtm_version = RTM_VERSION; 1600 arpc.rtm.rtm_type = RTM_GET; 1601 arpc.rtm.rtm_flags = RTF_UP; 1602 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1603 arpc.sin.sin_family = AF_INET; 1604 arpc.sin.sin_len = sizeof(arpc.sin); 1605 arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr; 1606 1607 /* publish */ 1608 if (lle->la_flags & LLE_PUB) { 1609 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1610 /* proxy only */ 1611 if (lle->la_flags & LLE_PROXY) 1612 arpc.sin.sin_other = SIN_PROXY; 1613 } 1614 1615 sdl = &arpc.sdl; 1616 sdl->sdl_family = AF_LINK; 1617 sdl->sdl_len = sizeof(*sdl); 1618 sdl->sdl_index = ifp->if_index; 1619 sdl->sdl_type = ifp->if_type; 1620 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 1621 sdl->sdl_alen = ifp->if_addrlen; 1622 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1623 } else { 1624 sdl->sdl_alen = 0; 1625 bzero(LLADDR(sdl), ifp->if_addrlen); 1626 } 1627 1628 arpc.rtm.rtm_rmx.rmx_expire = 1629 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1630 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1631 if (lle->la_flags & LLE_STATIC) 1632 arpc.rtm.rtm_flags |= RTF_STATIC; 1633 arpc.rtm.rtm_index = ifp->if_index; 1634 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1635 if (error) 1636 break; 1637 } 1638 } 1639 return error; 1640#undef SIN 1641} 1642 1643void * 1644in_domifattach(struct ifnet *ifp) 1645{ 1646 struct in_ifinfo *ii; 1647 struct lltable *llt; 1648 1649 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); 1650 1651 llt = lltable_init(ifp, AF_INET); 1652 if (llt != NULL) { 1653 llt->llt_free = in_lltable_free; 1654 llt->llt_prefix_free = in_lltable_prefix_free; 1655 llt->llt_lookup = in_lltable_lookup; 1656 llt->llt_dump = in_lltable_dump; 1657 } 1658 ii->ii_llt = llt; 1659 1660 ii->ii_igmp = igmp_domifattach(ifp); 1661 1662 return ii; 1663} 1664 1665void 1666in_domifdetach(struct ifnet *ifp, void *aux) 1667{ 1668 struct in_ifinfo *ii = (struct in_ifinfo *)aux; 1669 1670 igmp_domifdetach(ifp); 1671 lltable_free(ii->ii_llt); 1672 free(ii, M_IFADDR); 1673} 1674