in.c revision 231852
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 231852 2012-02-17 02:39:58Z bz $"); 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/if_ether.h> 60#include <netinet/in.h> 61#include <netinet/in_var.h> 62#include <netinet/in_pcb.h> 63#include <netinet/ip_var.h> 64#include <netinet/ip_carp.h> 65#include <netinet/igmp_var.h> 66#include <netinet/udp.h> 67#include <netinet/udp_var.h> 68 69static int in_mask2len(struct in_addr *); 70static void in_len2mask(struct in_addr *, int); 71static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, 72 struct ifnet *, struct thread *); 73 74static void in_socktrim(struct sockaddr_in *); 75static int in_ifinit(struct ifnet *, struct in_ifaddr *, 76 struct sockaddr_in *, int, int); 77static void in_purgemaddrs(struct ifnet *); 78 79static VNET_DEFINE(int, nosameprefix); 80#define V_nosameprefix VNET(nosameprefix) 81SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_RW, 82 &VNET_NAME(nosameprefix), 0, 83 "Refuse to create same prefixes on different interfaces"); 84 85VNET_DECLARE(struct inpcbinfo, ripcbinfo); 86#define V_ripcbinfo VNET(ripcbinfo) 87 88VNET_DECLARE(struct arpstat, arpstat); /* ARP statistics, see if_arp.h */ 89#define V_arpstat VNET(arpstat) 90 91/* 92 * Return 1 if an internet address is for a ``local'' host 93 * (one to which we have a connection). 94 */ 95int 96in_localaddr(struct in_addr in) 97{ 98 register u_long i = ntohl(in.s_addr); 99 register struct in_ifaddr *ia; 100 101 IN_IFADDR_RLOCK(); 102 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 103 if ((i & ia->ia_subnetmask) == ia->ia_subnet) { 104 IN_IFADDR_RUNLOCK(); 105 return (1); 106 } 107 } 108 IN_IFADDR_RUNLOCK(); 109 return (0); 110} 111 112/* 113 * Return 1 if an internet address is for the local host and configured 114 * on one of its interfaces. 115 */ 116int 117in_localip(struct in_addr in) 118{ 119 struct in_ifaddr *ia; 120 121 IN_IFADDR_RLOCK(); 122 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { 123 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) { 124 IN_IFADDR_RUNLOCK(); 125 return (1); 126 } 127 } 128 IN_IFADDR_RUNLOCK(); 129 return (0); 130} 131 132/* 133 * Determine whether an IP address is in a reserved set of addresses 134 * that may not be forwarded, or whether datagrams to that destination 135 * may be forwarded. 136 */ 137int 138in_canforward(struct in_addr in) 139{ 140 register u_long i = ntohl(in.s_addr); 141 register u_long net; 142 143 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i)) 144 return (0); 145 if (IN_CLASSA(i)) { 146 net = i & IN_CLASSA_NET; 147 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 148 return (0); 149 } 150 return (1); 151} 152 153/* 154 * Trim a mask in a sockaddr 155 */ 156static void 157in_socktrim(struct sockaddr_in *ap) 158{ 159 register char *cplim = (char *) &ap->sin_addr; 160 register char *cp = (char *) (&ap->sin_addr + 1); 161 162 ap->sin_len = 0; 163 while (--cp >= cplim) 164 if (*cp) { 165 (ap)->sin_len = cp - (char *) (ap) + 1; 166 break; 167 } 168} 169 170static int 171in_mask2len(mask) 172 struct in_addr *mask; 173{ 174 int x, y; 175 u_char *p; 176 177 p = (u_char *)mask; 178 for (x = 0; x < sizeof(*mask); x++) { 179 if (p[x] != 0xff) 180 break; 181 } 182 y = 0; 183 if (x < sizeof(*mask)) { 184 for (y = 0; y < 8; y++) { 185 if ((p[x] & (0x80 >> y)) == 0) 186 break; 187 } 188 } 189 return (x * 8 + y); 190} 191 192static void 193in_len2mask(struct in_addr *mask, int len) 194{ 195 int i; 196 u_char *p; 197 198 p = (u_char *)mask; 199 bzero(mask, sizeof(*mask)); 200 for (i = 0; i < len / 8; i++) 201 p[i] = 0xff; 202 if (len % 8) 203 p[i] = (0xff00 >> (len % 8)) & 0xff; 204} 205 206/* 207 * Generic internet control operations (ioctl's). 208 * 209 * ifp is NULL if not an interface-specific ioctl. 210 */ 211/* ARGSUSED */ 212int 213in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 214 struct thread *td) 215{ 216 register struct ifreq *ifr = (struct ifreq *)data; 217 register struct in_ifaddr *ia, *iap; 218 register struct ifaddr *ifa; 219 struct in_addr allhosts_addr; 220 struct in_addr dst; 221 struct in_ifinfo *ii; 222 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 223 int error, hostIsNew, iaIsNew, maskIsNew; 224 int iaIsFirst; 225 u_long ocmd = cmd; 226 227 /* 228 * Pre-10.x compat: OSIOCAIFADDR passes a shorter 229 * struct in_aliasreq, without ifra_vhid. 230 */ 231 if (cmd == OSIOCAIFADDR) 232 cmd = SIOCAIFADDR; 233 234 ia = NULL; 235 iaIsFirst = 0; 236 iaIsNew = 0; 237 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 238 239 /* 240 * Filter out ioctls we implement directly; forward the rest on to 241 * in_lifaddr_ioctl() and ifp->if_ioctl(). 242 */ 243 switch (cmd) { 244 case SIOCGIFADDR: 245 case SIOCGIFBRDADDR: 246 case SIOCGIFDSTADDR: 247 case SIOCGIFNETMASK: 248 case SIOCDIFADDR: 249 break; 250 case SIOCAIFADDR: 251 /* 252 * ifra_addr must be present and be of INET family. 253 * ifra_broadaddr and ifra_mask are optional. 254 */ 255 if (ifra->ifra_addr.sin_len != sizeof(struct sockaddr_in) || 256 ifra->ifra_addr.sin_family != AF_INET) 257 return (EINVAL); 258 if (ifra->ifra_broadaddr.sin_len != 0 && 259 (ifra->ifra_broadaddr.sin_len != 260 sizeof(struct sockaddr_in) || 261 ifra->ifra_broadaddr.sin_family != AF_INET)) 262 return (EINVAL); 263#if 0 264 /* 265 * ifconfig(8) in pre-10.x doesn't set sin_family for the 266 * mask. The code is disabled for the 10.x timeline, to 267 * make SIOCAIFADDR compatible with 9.x ifconfig(8). 268 * The code should be enabled in 11.x 269 */ 270 if (ifra->ifra_mask.sin_len != 0 && 271 (ifra->ifra_mask.sin_len != sizeof(struct sockaddr_in) || 272 ifra->ifra_mask.sin_family != AF_INET)) 273 return (EINVAL); 274#endif 275 break; 276 case SIOCSIFADDR: 277 case SIOCSIFBRDADDR: 278 case SIOCSIFDSTADDR: 279 case SIOCSIFNETMASK: 280 /* We no longer support that old commands. */ 281 return (EINVAL); 282 283 case SIOCALIFADDR: 284 if (td != NULL) { 285 error = priv_check(td, PRIV_NET_ADDIFADDR); 286 if (error) 287 return (error); 288 } 289 if (ifp == NULL) 290 return (EINVAL); 291 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 292 293 case SIOCDLIFADDR: 294 if (td != NULL) { 295 error = priv_check(td, PRIV_NET_DELIFADDR); 296 if (error) 297 return (error); 298 } 299 if (ifp == NULL) 300 return (EINVAL); 301 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 302 303 case SIOCGLIFADDR: 304 if (ifp == NULL) 305 return (EINVAL); 306 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 307 308 default: 309 if (ifp == NULL || ifp->if_ioctl == NULL) 310 return (EOPNOTSUPP); 311 return ((*ifp->if_ioctl)(ifp, cmd, data)); 312 } 313 314 if (ifp == NULL) 315 return (EADDRNOTAVAIL); 316 317 /* 318 * Security checks before we get involved in any work. 319 */ 320 switch (cmd) { 321 case SIOCAIFADDR: 322 if (td != NULL) { 323 error = priv_check(td, PRIV_NET_ADDIFADDR); 324 if (error) 325 return (error); 326 } 327 break; 328 329 case SIOCDIFADDR: 330 if (td != NULL) { 331 error = priv_check(td, PRIV_NET_DELIFADDR); 332 if (error) 333 return (error); 334 } 335 break; 336 } 337 338 /* 339 * Find address for this interface, if it exists. 340 * 341 * If an alias address was specified, find that one instead of the 342 * first one on the interface, if possible. 343 */ 344 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 345 IN_IFADDR_RLOCK(); 346 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) { 347 if (iap->ia_ifp == ifp && 348 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 349 if (td == NULL || prison_check_ip4(td->td_ucred, 350 &dst) == 0) 351 ia = iap; 352 break; 353 } 354 } 355 if (ia != NULL) 356 ifa_ref(&ia->ia_ifa); 357 IN_IFADDR_RUNLOCK(); 358 if (ia == NULL) { 359 IF_ADDR_RLOCK(ifp); 360 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 361 iap = ifatoia(ifa); 362 if (iap->ia_addr.sin_family == AF_INET) { 363 if (td != NULL && 364 prison_check_ip4(td->td_ucred, 365 &iap->ia_addr.sin_addr) != 0) 366 continue; 367 ia = iap; 368 break; 369 } 370 } 371 if (ia != NULL) 372 ifa_ref(&ia->ia_ifa); 373 IF_ADDR_RUNLOCK(ifp); 374 } 375 if (ia == NULL) 376 iaIsFirst = 1; 377 378 error = 0; 379 switch (cmd) { 380 case SIOCAIFADDR: 381 case SIOCDIFADDR: 382 if (ifra->ifra_addr.sin_family == AF_INET) { 383 struct in_ifaddr *oia; 384 385 IN_IFADDR_RLOCK(); 386 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 387 if (ia->ia_ifp == ifp && 388 ia->ia_addr.sin_addr.s_addr == 389 ifra->ifra_addr.sin_addr.s_addr) 390 break; 391 } 392 if (ia != NULL && ia != oia) 393 ifa_ref(&ia->ia_ifa); 394 if (oia != NULL && ia != oia) 395 ifa_free(&oia->ia_ifa); 396 IN_IFADDR_RUNLOCK(); 397 if ((ifp->if_flags & IFF_POINTOPOINT) 398 && (cmd == SIOCAIFADDR) 399 && (ifra->ifra_dstaddr.sin_addr.s_addr 400 == INADDR_ANY)) { 401 error = EDESTADDRREQ; 402 goto out; 403 } 404 } 405 if (cmd == SIOCDIFADDR && ia == NULL) { 406 error = EADDRNOTAVAIL; 407 goto out; 408 } 409 if (ia == NULL) { 410 ia = (struct in_ifaddr *) 411 malloc(sizeof *ia, M_IFADDR, M_NOWAIT | 412 M_ZERO); 413 if (ia == NULL) { 414 error = ENOBUFS; 415 goto out; 416 } 417 418 ifa = &ia->ia_ifa; 419 ifa_init(ifa); 420 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 421 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 422 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 423 424 ia->ia_sockmask.sin_len = 8; 425 ia->ia_sockmask.sin_family = AF_INET; 426 if (ifp->if_flags & IFF_BROADCAST) { 427 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 428 ia->ia_broadaddr.sin_family = AF_INET; 429 } 430 ia->ia_ifp = ifp; 431 432 ifa_ref(ifa); /* if_addrhead */ 433 IF_ADDR_WLOCK(ifp); 434 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 435 IF_ADDR_WUNLOCK(ifp); 436 ifa_ref(ifa); /* in_ifaddrhead */ 437 IN_IFADDR_WLOCK(); 438 TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link); 439 IN_IFADDR_WUNLOCK(); 440 iaIsNew = 1; 441 } 442 break; 443 444 case SIOCGIFADDR: 445 case SIOCGIFNETMASK: 446 case SIOCGIFDSTADDR: 447 case SIOCGIFBRDADDR: 448 if (ia == NULL) { 449 error = EADDRNOTAVAIL; 450 goto out; 451 } 452 break; 453 } 454 455 /* 456 * Most paths in this switch return directly or via out. Only paths 457 * that remove the address break in order to hit common removal code. 458 */ 459 switch (cmd) { 460 case SIOCGIFADDR: 461 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 462 goto out; 463 464 case SIOCGIFBRDADDR: 465 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 466 error = EINVAL; 467 goto out; 468 } 469 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 470 goto out; 471 472 case SIOCGIFDSTADDR: 473 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 474 error = EINVAL; 475 goto out; 476 } 477 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 478 goto out; 479 480 case SIOCGIFNETMASK: 481 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 482 goto out; 483 484 case SIOCAIFADDR: 485 maskIsNew = 0; 486 hostIsNew = 1; 487 error = 0; 488 if (ifra->ifra_addr.sin_addr.s_addr == 489 ia->ia_addr.sin_addr.s_addr) 490 hostIsNew = 0; 491 if (ifra->ifra_mask.sin_len) { 492 /* 493 * QL: XXX 494 * Need to scrub the prefix here in case 495 * the issued command is SIOCAIFADDR with 496 * the same address, but with a different 497 * prefix length. And if the prefix length 498 * is the same as before, then the call is 499 * un-necessarily executed here. 500 */ 501 in_ifscrub(ifp, ia, LLE_STATIC); 502 ia->ia_sockmask = ifra->ifra_mask; 503 ia->ia_sockmask.sin_family = AF_INET; 504 ia->ia_subnetmask = 505 ntohl(ia->ia_sockmask.sin_addr.s_addr); 506 maskIsNew = 1; 507 } 508 if ((ifp->if_flags & IFF_POINTOPOINT) && 509 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 510 in_ifscrub(ifp, ia, LLE_STATIC); 511 ia->ia_dstaddr = ifra->ifra_dstaddr; 512 maskIsNew = 1; /* We lie; but the effect's the same */ 513 } 514 if (hostIsNew || maskIsNew) 515 error = in_ifinit(ifp, ia, &ifra->ifra_addr, maskIsNew, 516 (ocmd == cmd ? ifra->ifra_vhid : 0)); 517 if (error != 0 && iaIsNew) 518 break; 519 520 if ((ifp->if_flags & IFF_BROADCAST) && 521 ifra->ifra_broadaddr.sin_len) 522 ia->ia_broadaddr = ifra->ifra_broadaddr; 523 if (error == 0) { 524 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 525 if (iaIsFirst && 526 (ifp->if_flags & IFF_MULTICAST) != 0) { 527 error = in_joingroup(ifp, &allhosts_addr, 528 NULL, &ii->ii_allhosts); 529 } 530 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 531 } 532 goto out; 533 534 case SIOCDIFADDR: 535 /* 536 * in_ifscrub kills the interface route. 537 */ 538 in_ifscrub(ifp, ia, LLE_STATIC); 539 540 /* 541 * in_ifadown gets rid of all the rest of 542 * the routes. This is not quite the right 543 * thing to do, but at least if we are running 544 * a routing process they will come back. 545 */ 546 in_ifadown(&ia->ia_ifa, 1); 547 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 548 error = 0; 549 break; 550 551 default: 552 panic("in_control: unsupported ioctl"); 553 } 554 555 if (ia->ia_ifa.ifa_carp) 556 (*carp_detach_p)(&ia->ia_ifa); 557 558 IF_ADDR_WLOCK(ifp); 559 /* Re-check that ia is still part of the list. */ 560 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 561 if (ifa == &ia->ia_ifa) 562 break; 563 } 564 if (ifa == NULL) { 565 /* 566 * If we lost the race with another thread, there is no need to 567 * try it again for the next loop as there is no other exit 568 * path between here and out. 569 */ 570 IF_ADDR_WUNLOCK(ifp); 571 error = EADDRNOTAVAIL; 572 goto out; 573 } 574 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 575 IF_ADDR_WUNLOCK(ifp); 576 ifa_free(&ia->ia_ifa); /* if_addrhead */ 577 578 IN_IFADDR_WLOCK(); 579 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link); 580 581 LIST_REMOVE(ia, ia_hash); 582 IN_IFADDR_WUNLOCK(); 583 /* 584 * If this is the last IPv4 address configured on this 585 * interface, leave the all-hosts group. 586 * No state-change report need be transmitted. 587 */ 588 IFP_TO_IA(ifp, iap); 589 if (iap == NULL) { 590 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 591 IN_MULTI_LOCK(); 592 if (ii->ii_allhosts) { 593 (void)in_leavegroup_locked(ii->ii_allhosts, NULL); 594 ii->ii_allhosts = NULL; 595 } 596 IN_MULTI_UNLOCK(); 597 } else 598 ifa_free(&iap->ia_ifa); 599 600 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 601out: 602 if (ia != NULL) 603 ifa_free(&ia->ia_ifa); 604 return (error); 605} 606 607/* 608 * SIOC[GAD]LIFADDR. 609 * SIOCGLIFADDR: get first address. (?!?) 610 * SIOCGLIFADDR with IFLR_PREFIX: 611 * get first address that matches the specified prefix. 612 * SIOCALIFADDR: add the specified address. 613 * SIOCALIFADDR with IFLR_PREFIX: 614 * EINVAL since we can't deduce hostid part of the address. 615 * SIOCDLIFADDR: delete the specified address. 616 * SIOCDLIFADDR with IFLR_PREFIX: 617 * delete the first address that matches the specified prefix. 618 * return values: 619 * EINVAL on invalid parameters 620 * EADDRNOTAVAIL on prefix match failed/specified address not found 621 * other values may be returned from in_ioctl() 622 */ 623static int 624in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 625 struct ifnet *ifp, struct thread *td) 626{ 627 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 628 struct ifaddr *ifa; 629 630 /* sanity checks */ 631 if (data == NULL || ifp == NULL) { 632 panic("invalid argument to in_lifaddr_ioctl"); 633 /*NOTRECHED*/ 634 } 635 636 switch (cmd) { 637 case SIOCGLIFADDR: 638 /* address must be specified on GET with IFLR_PREFIX */ 639 if ((iflr->flags & IFLR_PREFIX) == 0) 640 break; 641 /*FALLTHROUGH*/ 642 case SIOCALIFADDR: 643 case SIOCDLIFADDR: 644 /* address must be specified on ADD and DELETE */ 645 if (iflr->addr.ss_family != AF_INET) 646 return (EINVAL); 647 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 648 return (EINVAL); 649 /* XXX need improvement */ 650 if (iflr->dstaddr.ss_family 651 && iflr->dstaddr.ss_family != AF_INET) 652 return (EINVAL); 653 if (iflr->dstaddr.ss_family 654 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 655 return (EINVAL); 656 break; 657 default: /*shouldn't happen*/ 658 return (EOPNOTSUPP); 659 } 660 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 661 return (EINVAL); 662 663 switch (cmd) { 664 case SIOCALIFADDR: 665 { 666 struct in_aliasreq ifra; 667 668 if (iflr->flags & IFLR_PREFIX) 669 return (EINVAL); 670 671 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR). */ 672 bzero(&ifra, sizeof(ifra)); 673 bcopy(iflr->iflr_name, ifra.ifra_name, 674 sizeof(ifra.ifra_name)); 675 676 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 677 678 if (iflr->dstaddr.ss_family) { /*XXX*/ 679 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 680 iflr->dstaddr.ss_len); 681 } 682 683 ifra.ifra_mask.sin_family = AF_INET; 684 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 685 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 686 687 return (in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td)); 688 } 689 case SIOCGLIFADDR: 690 case SIOCDLIFADDR: 691 { 692 struct in_ifaddr *ia; 693 struct in_addr mask, candidate, match; 694 struct sockaddr_in *sin; 695 696 bzero(&mask, sizeof(mask)); 697 bzero(&match, sizeof(match)); 698 if (iflr->flags & IFLR_PREFIX) { 699 /* lookup a prefix rather than address. */ 700 in_len2mask(&mask, iflr->prefixlen); 701 702 sin = (struct sockaddr_in *)&iflr->addr; 703 match.s_addr = sin->sin_addr.s_addr; 704 match.s_addr &= mask.s_addr; 705 706 /* if you set extra bits, that's wrong */ 707 if (match.s_addr != sin->sin_addr.s_addr) 708 return (EINVAL); 709 710 } else { 711 /* on getting an address, take the 1st match */ 712 /* on deleting an address, do exact match */ 713 if (cmd != SIOCGLIFADDR) { 714 in_len2mask(&mask, 32); 715 sin = (struct sockaddr_in *)&iflr->addr; 716 match.s_addr = sin->sin_addr.s_addr; 717 } 718 } 719 720 IF_ADDR_RLOCK(ifp); 721 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 722 if (ifa->ifa_addr->sa_family != AF_INET) 723 continue; 724 if (match.s_addr == 0) 725 break; 726 sin = (struct sockaddr_in *)&ifa->ifa_addr; 727 candidate.s_addr = sin->sin_addr.s_addr; 728 candidate.s_addr &= mask.s_addr; 729 if (candidate.s_addr == match.s_addr) 730 break; 731 } 732 if (ifa != NULL) 733 ifa_ref(ifa); 734 IF_ADDR_RUNLOCK(ifp); 735 if (ifa == NULL) 736 return (EADDRNOTAVAIL); 737 ia = (struct in_ifaddr *)ifa; 738 739 if (cmd == SIOCGLIFADDR) { 740 /* fill in the if_laddrreq structure */ 741 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 742 743 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 744 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 745 ia->ia_dstaddr.sin_len); 746 } else 747 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 748 749 iflr->prefixlen = 750 in_mask2len(&ia->ia_sockmask.sin_addr); 751 752 iflr->flags = 0; /*XXX*/ 753 ifa_free(ifa); 754 755 return (0); 756 } else { 757 struct in_aliasreq ifra; 758 759 /* fill in_aliasreq and do ioctl(SIOCDIFADDR) */ 760 bzero(&ifra, sizeof(ifra)); 761 bcopy(iflr->iflr_name, ifra.ifra_name, 762 sizeof(ifra.ifra_name)); 763 764 bcopy(&ia->ia_addr, &ifra.ifra_addr, 765 ia->ia_addr.sin_len); 766 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 767 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 768 ia->ia_dstaddr.sin_len); 769 } 770 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 771 ia->ia_sockmask.sin_len); 772 ifa_free(ifa); 773 774 return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 775 ifp, td)); 776 } 777 } 778 } 779 780 return (EOPNOTSUPP); /*just for safety*/ 781} 782 783/* 784 * Delete any existing route for an interface. 785 */ 786void 787in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia, u_int flags) 788{ 789 790 in_scrubprefix(ia, flags); 791} 792 793/* 794 * Initialize an interface's internet address 795 * and routing table entry. 796 */ 797static int 798in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, 799 int masksupplied, int vhid) 800{ 801 register u_long i = ntohl(sin->sin_addr.s_addr); 802 int flags = RTF_UP, error = 0; 803 804 IN_IFADDR_WLOCK(); 805 if (ia->ia_addr.sin_family == AF_INET) 806 LIST_REMOVE(ia, ia_hash); 807 ia->ia_addr = *sin; 808 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 809 ia, ia_hash); 810 IN_IFADDR_WUNLOCK(); 811 812 if (vhid > 0) { 813 if (carp_attach_p != NULL) 814 error = (*carp_attach_p)(&ia->ia_ifa, vhid); 815 else 816 error = EPROTONOSUPPORT; 817 } 818 if (error) 819 return (error); 820 821 /* 822 * Give the interface a chance to initialize 823 * if this is its first address, 824 * and to validate the address if necessary. 825 */ 826 if (ifp->if_ioctl != NULL && 827 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia)) != 0) 828 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 829 return (error); 830 831 /* 832 * Be compatible with network classes, if netmask isn't supplied, 833 * guess it based on classes. 834 */ 835 if (!masksupplied) { 836 if (IN_CLASSA(i)) 837 ia->ia_subnetmask = IN_CLASSA_NET; 838 else if (IN_CLASSB(i)) 839 ia->ia_subnetmask = IN_CLASSB_NET; 840 else 841 ia->ia_subnetmask = IN_CLASSC_NET; 842 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 843 } 844 ia->ia_subnet = i & ia->ia_subnetmask; 845 in_socktrim(&ia->ia_sockmask); 846 /* 847 * Add route for the network. 848 */ 849 ia->ia_ifa.ifa_metric = ifp->if_metric; 850 if (ifp->if_flags & IFF_BROADCAST) { 851 if (ia->ia_subnetmask == IN_RFC3021_MASK) 852 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST; 853 else 854 ia->ia_broadaddr.sin_addr.s_addr = 855 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 856 } else if (ifp->if_flags & IFF_LOOPBACK) { 857 ia->ia_dstaddr = ia->ia_addr; 858 flags |= RTF_HOST; 859 } else if (ifp->if_flags & IFF_POINTOPOINT) { 860 if (ia->ia_dstaddr.sin_family != AF_INET) 861 return (0); 862 flags |= RTF_HOST; 863 } 864 if (!vhid && (error = in_addprefix(ia, flags)) != 0) 865 return (error); 866 867 if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY) 868 return (0); 869 870 if (ifp->if_flags & IFF_POINTOPOINT && 871 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 872 return (0); 873 874 /* 875 * add a loopback route to self 876 */ 877 if (V_useloopback && !vhid && !(ifp->if_flags & IFF_LOOPBACK)) { 878 struct route ia_ro; 879 880 bzero(&ia_ro, sizeof(ia_ro)); 881 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = ia->ia_addr; 882 rtalloc_ign_fib(&ia_ro, 0, RT_DEFAULT_FIB); 883 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) && 884 (ia_ro.ro_rt->rt_ifp == V_loif)) { 885 RT_LOCK(ia_ro.ro_rt); 886 RT_ADDREF(ia_ro.ro_rt); 887 RTFREE_LOCKED(ia_ro.ro_rt); 888 } else 889 error = ifa_add_loopback_route((struct ifaddr *)ia, 890 (struct sockaddr *)&ia->ia_addr); 891 if (error == 0) 892 ia->ia_flags |= IFA_RTSELF; 893 if (ia_ro.ro_rt != NULL) 894 RTFREE(ia_ro.ro_rt); 895 } 896 897 return (error); 898} 899 900#define rtinitflags(x) \ 901 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 902 ? RTF_HOST : 0) 903 904/* 905 * Generate a routing message when inserting or deleting 906 * an interface address alias. 907 */ 908static void in_addralias_rtmsg(int cmd, struct in_addr *prefix, 909 struct in_ifaddr *target) 910{ 911 struct route pfx_ro; 912 struct sockaddr_in *pfx_addr; 913 struct rtentry msg_rt; 914 915 /* QL: XXX 916 * This is a bit questionable because there is no 917 * additional route entry added/deleted for an address 918 * alias. Therefore this route report is inaccurate. 919 */ 920 bzero(&pfx_ro, sizeof(pfx_ro)); 921 pfx_addr = (struct sockaddr_in *)(&pfx_ro.ro_dst); 922 pfx_addr->sin_len = sizeof(*pfx_addr); 923 pfx_addr->sin_family = AF_INET; 924 pfx_addr->sin_addr = *prefix; 925 rtalloc_ign_fib(&pfx_ro, 0, 0); 926 if (pfx_ro.ro_rt != NULL) { 927 msg_rt = *pfx_ro.ro_rt; 928 929 /* QL: XXX 930 * Point the gateway to the new interface 931 * address as if a new prefix route entry has 932 * been added through the new address alias. 933 * All other parts of the rtentry is accurate, 934 * e.g., rt_key, rt_mask, rt_ifp etc. 935 */ 936 msg_rt.rt_gateway = 937 (struct sockaddr *)&target->ia_addr; 938 rt_newaddrmsg(cmd, 939 (struct ifaddr *)target, 940 0, &msg_rt); 941 RTFREE(pfx_ro.ro_rt); 942 } 943 return; 944} 945 946/* 947 * Check if we have a route for the given prefix already or add one accordingly. 948 */ 949int 950in_addprefix(struct in_ifaddr *target, int flags) 951{ 952 struct in_ifaddr *ia; 953 struct in_addr prefix, mask, p, m; 954 int error; 955 956 if ((flags & RTF_HOST) != 0) { 957 prefix = target->ia_dstaddr.sin_addr; 958 mask.s_addr = 0; 959 } else { 960 prefix = target->ia_addr.sin_addr; 961 mask = target->ia_sockmask.sin_addr; 962 prefix.s_addr &= mask.s_addr; 963 } 964 965 IN_IFADDR_RLOCK(); 966 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 967 if (rtinitflags(ia)) { 968 p = ia->ia_dstaddr.sin_addr; 969 970 if (prefix.s_addr != p.s_addr) 971 continue; 972 } else { 973 p = ia->ia_addr.sin_addr; 974 m = ia->ia_sockmask.sin_addr; 975 p.s_addr &= m.s_addr; 976 977 if (prefix.s_addr != p.s_addr || 978 mask.s_addr != m.s_addr) 979 continue; 980 } 981 982 /* 983 * If we got a matching prefix route inserted by other 984 * interface address, we are done here. 985 */ 986 if (ia->ia_flags & IFA_ROUTE) { 987#ifdef RADIX_MPATH 988 if (ia->ia_addr.sin_addr.s_addr == 989 target->ia_addr.sin_addr.s_addr) { 990 IN_IFADDR_RUNLOCK(); 991 return (EEXIST); 992 } else 993 break; 994#endif 995 if (V_nosameprefix) { 996 IN_IFADDR_RUNLOCK(); 997 return (EEXIST); 998 } else { 999 in_addralias_rtmsg(RTM_ADD, &prefix, target); 1000 IN_IFADDR_RUNLOCK(); 1001 return (0); 1002 } 1003 } 1004 } 1005 IN_IFADDR_RUNLOCK(); 1006 1007 /* 1008 * No-one seem to have this prefix route, so we try to insert it. 1009 */ 1010 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 1011 if (!error) 1012 target->ia_flags |= IFA_ROUTE; 1013 return (error); 1014} 1015 1016/* 1017 * If there is no other address in the system that can serve a route to the 1018 * same prefix, remove the route. Hand over the route to the new address 1019 * otherwise. 1020 */ 1021int 1022in_scrubprefix(struct in_ifaddr *target, u_int flags) 1023{ 1024 struct in_ifaddr *ia; 1025 struct in_addr prefix, mask, p, m; 1026 int error = 0; 1027 struct sockaddr_in prefix0, mask0; 1028 1029 /* 1030 * Remove the loopback route to the interface address. 1031 * The "useloopback" setting is not consulted because if the 1032 * user configures an interface address, turns off this 1033 * setting, and then tries to delete that interface address, 1034 * checking the current setting of "useloopback" would leave 1035 * that interface address loopback route untouched, which 1036 * would be wrong. Therefore the interface address loopback route 1037 * deletion is unconditional. 1038 */ 1039 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) && 1040 !(target->ia_ifp->if_flags & IFF_LOOPBACK) && 1041 (target->ia_flags & IFA_RTSELF)) { 1042 struct route ia_ro; 1043 int freeit = 0; 1044 1045 bzero(&ia_ro, sizeof(ia_ro)); 1046 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = target->ia_addr; 1047 rtalloc_ign_fib(&ia_ro, 0, 0); 1048 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) && 1049 (ia_ro.ro_rt->rt_ifp == V_loif)) { 1050 RT_LOCK(ia_ro.ro_rt); 1051 if (ia_ro.ro_rt->rt_refcnt <= 1) 1052 freeit = 1; 1053 else if (flags & LLE_STATIC) { 1054 RT_REMREF(ia_ro.ro_rt); 1055 target->ia_flags &= ~IFA_RTSELF; 1056 } 1057 RTFREE_LOCKED(ia_ro.ro_rt); 1058 } 1059 if (freeit && (flags & LLE_STATIC)) { 1060 error = ifa_del_loopback_route((struct ifaddr *)target, 1061 (struct sockaddr *)&target->ia_addr); 1062 if (error == 0) 1063 target->ia_flags &= ~IFA_RTSELF; 1064 } 1065 if ((flags & LLE_STATIC) && 1066 !(target->ia_ifp->if_flags & IFF_NOARP)) 1067 /* remove arp cache */ 1068 arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr); 1069 } 1070 1071 if (rtinitflags(target)) { 1072 prefix = target->ia_dstaddr.sin_addr; 1073 mask.s_addr = 0; 1074 } else { 1075 prefix = target->ia_addr.sin_addr; 1076 mask = target->ia_sockmask.sin_addr; 1077 prefix.s_addr &= mask.s_addr; 1078 } 1079 1080 if ((target->ia_flags & IFA_ROUTE) == 0) { 1081 in_addralias_rtmsg(RTM_DELETE, &prefix, target); 1082 return (0); 1083 } 1084 1085 IN_IFADDR_RLOCK(); 1086 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1087 if (rtinitflags(ia)) { 1088 p = ia->ia_dstaddr.sin_addr; 1089 1090 if (prefix.s_addr != p.s_addr) 1091 continue; 1092 } else { 1093 p = ia->ia_addr.sin_addr; 1094 m = ia->ia_sockmask.sin_addr; 1095 p.s_addr &= m.s_addr; 1096 1097 if (prefix.s_addr != p.s_addr || 1098 mask.s_addr != m.s_addr) 1099 continue; 1100 } 1101 1102 if ((ia->ia_ifp->if_flags & IFF_UP) == 0) 1103 continue; 1104 1105 /* 1106 * If we got a matching prefix address, move IFA_ROUTE and 1107 * the route itself to it. Make sure that routing daemons 1108 * get a heads-up. 1109 */ 1110 if ((ia->ia_flags & IFA_ROUTE) == 0) { 1111 ifa_ref(&ia->ia_ifa); 1112 IN_IFADDR_RUNLOCK(); 1113 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, 1114 rtinitflags(target)); 1115 if (error == 0) 1116 target->ia_flags &= ~IFA_ROUTE; 1117 else 1118 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n", 1119 error); 1120 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 1121 rtinitflags(ia) | RTF_UP); 1122 if (error == 0) 1123 ia->ia_flags |= IFA_ROUTE; 1124 else 1125 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n", 1126 error); 1127 ifa_free(&ia->ia_ifa); 1128 return (error); 1129 } 1130 } 1131 IN_IFADDR_RUNLOCK(); 1132 1133 /* 1134 * remove all L2 entries on the given prefix 1135 */ 1136 bzero(&prefix0, sizeof(prefix0)); 1137 prefix0.sin_len = sizeof(prefix0); 1138 prefix0.sin_family = AF_INET; 1139 prefix0.sin_addr.s_addr = target->ia_subnet; 1140 bzero(&mask0, sizeof(mask0)); 1141 mask0.sin_len = sizeof(mask0); 1142 mask0.sin_family = AF_INET; 1143 mask0.sin_addr.s_addr = target->ia_subnetmask; 1144 lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0, 1145 (struct sockaddr *)&mask0, flags); 1146 1147 /* 1148 * As no-one seem to have this prefix, we can remove the route. 1149 */ 1150 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 1151 if (error == 0) 1152 target->ia_flags &= ~IFA_ROUTE; 1153 else 1154 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error); 1155 return (error); 1156} 1157 1158#undef rtinitflags 1159 1160/* 1161 * Return 1 if the address might be a local broadcast address. 1162 */ 1163int 1164in_broadcast(struct in_addr in, struct ifnet *ifp) 1165{ 1166 register struct ifaddr *ifa; 1167 u_long t; 1168 1169 if (in.s_addr == INADDR_BROADCAST || 1170 in.s_addr == INADDR_ANY) 1171 return (1); 1172 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1173 return (0); 1174 t = ntohl(in.s_addr); 1175 /* 1176 * Look through the list of addresses for a match 1177 * with a broadcast address. 1178 */ 1179#define ia ((struct in_ifaddr *)ifa) 1180 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1181 if (ifa->ifa_addr->sa_family == AF_INET && 1182 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1183 /* 1184 * Check for old-style (host 0) broadcast, but 1185 * taking into account that RFC 3021 obsoletes it. 1186 */ 1187 (ia->ia_subnetmask != IN_RFC3021_MASK && 1188 t == ia->ia_subnet)) && 1189 /* 1190 * Check for an all one subnetmask. These 1191 * only exist when an interface gets a secondary 1192 * address. 1193 */ 1194 ia->ia_subnetmask != (u_long)0xffffffff) 1195 return (1); 1196 return (0); 1197#undef ia 1198} 1199 1200/* 1201 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 1202 */ 1203void 1204in_ifdetach(struct ifnet *ifp) 1205{ 1206 1207 in_pcbpurgeif0(&V_ripcbinfo, ifp); 1208 in_pcbpurgeif0(&V_udbinfo, ifp); 1209 in_purgemaddrs(ifp); 1210} 1211 1212/* 1213 * Delete all IPv4 multicast address records, and associated link-layer 1214 * multicast address records, associated with ifp. 1215 * XXX It looks like domifdetach runs AFTER the link layer cleanup. 1216 * XXX This should not race with ifma_protospec being set during 1217 * a new allocation, if it does, we have bigger problems. 1218 */ 1219static void 1220in_purgemaddrs(struct ifnet *ifp) 1221{ 1222 LIST_HEAD(,in_multi) purgeinms; 1223 struct in_multi *inm, *tinm; 1224 struct ifmultiaddr *ifma; 1225 1226 LIST_INIT(&purgeinms); 1227 IN_MULTI_LOCK(); 1228 1229 /* 1230 * Extract list of in_multi associated with the detaching ifp 1231 * which the PF_INET layer is about to release. 1232 * We need to do this as IF_ADDR_LOCK() may be re-acquired 1233 * by code further down. 1234 */ 1235 IF_ADDR_RLOCK(ifp); 1236 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1237 if (ifma->ifma_addr->sa_family != AF_INET || 1238 ifma->ifma_protospec == NULL) 1239 continue; 1240#if 0 1241 KASSERT(ifma->ifma_protospec != NULL, 1242 ("%s: ifma_protospec is NULL", __func__)); 1243#endif 1244 inm = (struct in_multi *)ifma->ifma_protospec; 1245 LIST_INSERT_HEAD(&purgeinms, inm, inm_link); 1246 } 1247 IF_ADDR_RUNLOCK(ifp); 1248 1249 LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) { 1250 LIST_REMOVE(inm, inm_link); 1251 inm_release_locked(inm); 1252 } 1253 igmp_ifdetach(ifp); 1254 1255 IN_MULTI_UNLOCK(); 1256} 1257 1258struct in_llentry { 1259 struct llentry base; 1260 struct sockaddr_in l3_addr4; 1261}; 1262 1263static struct llentry * 1264in_lltable_new(const struct sockaddr *l3addr, u_int flags) 1265{ 1266 struct in_llentry *lle; 1267 1268 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_DONTWAIT | M_ZERO); 1269 if (lle == NULL) /* NB: caller generates msg */ 1270 return NULL; 1271 1272 callout_init(&lle->base.la_timer, CALLOUT_MPSAFE); 1273 /* 1274 * For IPv4 this will trigger "arpresolve" to generate 1275 * an ARP request. 1276 */ 1277 lle->base.la_expire = time_uptime; /* mark expired */ 1278 lle->l3_addr4 = *(const struct sockaddr_in *)l3addr; 1279 lle->base.lle_refcnt = 1; 1280 LLE_LOCK_INIT(&lle->base); 1281 return &lle->base; 1282} 1283 1284/* 1285 * Deletes an address from the address table. 1286 * This function is called by the timer functions 1287 * such as arptimer() and nd6_llinfo_timer(), and 1288 * the caller does the locking. 1289 */ 1290static void 1291in_lltable_free(struct lltable *llt, struct llentry *lle) 1292{ 1293 LLE_WUNLOCK(lle); 1294 LLE_LOCK_DESTROY(lle); 1295 free(lle, M_LLTABLE); 1296} 1297 1298 1299#define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 1300 (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 ) 1301 1302static void 1303in_lltable_prefix_free(struct lltable *llt, 1304 const struct sockaddr *prefix, 1305 const struct sockaddr *mask, 1306 u_int flags) 1307{ 1308 const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix; 1309 const struct sockaddr_in *msk = (const struct sockaddr_in *)mask; 1310 struct llentry *lle, *next; 1311 register int i; 1312 size_t pkts_dropped; 1313 1314 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) { 1315 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 1316 1317 /* 1318 * (flags & LLE_STATIC) means deleting all entries 1319 * including static ARP entries 1320 */ 1321 if (IN_ARE_MASKED_ADDR_EQUAL((struct sockaddr_in *)L3_ADDR(lle), 1322 pfx, msk) && 1323 ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) { 1324 int canceled; 1325 1326 canceled = callout_drain(&lle->la_timer); 1327 LLE_WLOCK(lle); 1328 if (canceled) 1329 LLE_REMREF(lle); 1330 pkts_dropped = llentry_free(lle); 1331 ARPSTAT_ADD(dropped, pkts_dropped); 1332 } 1333 } 1334 } 1335} 1336 1337 1338static int 1339in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr) 1340{ 1341 struct rtentry *rt; 1342 1343 KASSERT(l3addr->sa_family == AF_INET, 1344 ("sin_family %d", l3addr->sa_family)); 1345 1346 /* XXX rtalloc1 should take a const param */ 1347 rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0); 1348 1349 if (rt == NULL) 1350 return (EINVAL); 1351 1352 /* 1353 * If the gateway for an existing host route matches the target L3 1354 * address, which is a special route inserted by some implementation 1355 * such as MANET, and the interface is of the correct type, then 1356 * allow for ARP to proceed. 1357 */ 1358 if (rt->rt_flags & RTF_GATEWAY) { 1359 if (!(rt->rt_flags & RTF_HOST) || !rt->rt_ifp || 1360 rt->rt_ifp->if_type != IFT_ETHER || 1361 (rt->rt_ifp->if_flags & 1362 (IFF_NOARP | IFF_STATICARP)) != 0 || 1363 memcmp(rt->rt_gateway->sa_data, l3addr->sa_data, 1364 sizeof(in_addr_t)) != 0) { 1365 RTFREE_LOCKED(rt); 1366 return (EINVAL); 1367 } 1368 } 1369 1370 /* 1371 * Make sure that at least the destination address is covered 1372 * by the route. This is for handling the case where 2 or more 1373 * interfaces have the same prefix. An incoming packet arrives 1374 * on one interface and the corresponding outgoing packet leaves 1375 * another interface. 1376 */ 1377 if (!(rt->rt_flags & RTF_HOST) && rt->rt_ifp != ifp) { 1378 const char *sa, *mask, *addr, *lim; 1379 int len; 1380 1381 mask = (const char *)rt_mask(rt); 1382 /* 1383 * Just being extra cautious to avoid some custom 1384 * code getting into trouble. 1385 */ 1386 if (mask == NULL) { 1387 RTFREE_LOCKED(rt); 1388 return (EINVAL); 1389 } 1390 1391 sa = (const char *)rt_key(rt); 1392 addr = (const char *)l3addr; 1393 len = ((const struct sockaddr_in *)l3addr)->sin_len; 1394 lim = addr + len; 1395 1396 for ( ; addr < lim; sa++, mask++, addr++) { 1397 if ((*sa ^ *addr) & *mask) { 1398#ifdef DIAGNOSTIC 1399 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n", 1400 inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr)); 1401#endif 1402 RTFREE_LOCKED(rt); 1403 return (EINVAL); 1404 } 1405 } 1406 } 1407 1408 RTFREE_LOCKED(rt); 1409 return (0); 1410} 1411 1412/* 1413 * Return NULL if not found or marked for deletion. 1414 * If found return lle read locked. 1415 */ 1416static struct llentry * 1417in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1418{ 1419 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1420 struct ifnet *ifp = llt->llt_ifp; 1421 struct llentry *lle; 1422 struct llentries *lleh; 1423 u_int hashkey; 1424 1425 IF_AFDATA_LOCK_ASSERT(ifp); 1426 KASSERT(l3addr->sa_family == AF_INET, 1427 ("sin_family %d", l3addr->sa_family)); 1428 1429 hashkey = sin->sin_addr.s_addr; 1430 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 1431 LIST_FOREACH(lle, lleh, lle_next) { 1432 struct sockaddr_in *sa2 = (struct sockaddr_in *)L3_ADDR(lle); 1433 if (lle->la_flags & LLE_DELETED) 1434 continue; 1435 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr) 1436 break; 1437 } 1438 if (lle == NULL) { 1439#ifdef DIAGNOSTIC 1440 if (flags & LLE_DELETE) 1441 log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle); 1442#endif 1443 if (!(flags & LLE_CREATE)) 1444 return (NULL); 1445 /* 1446 * A route that covers the given address must have 1447 * been installed 1st because we are doing a resolution, 1448 * verify this. 1449 */ 1450 if (!(flags & LLE_IFADDR) && 1451 in_lltable_rtcheck(ifp, flags, l3addr) != 0) 1452 goto done; 1453 1454 lle = in_lltable_new(l3addr, flags); 1455 if (lle == NULL) { 1456 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 1457 goto done; 1458 } 1459 lle->la_flags = flags & ~LLE_CREATE; 1460 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 1461 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 1462 lle->la_flags |= (LLE_VALID | LLE_STATIC); 1463 } 1464 1465 lle->lle_tbl = llt; 1466 lle->lle_head = lleh; 1467 LIST_INSERT_HEAD(lleh, lle, lle_next); 1468 } else if (flags & LLE_DELETE) { 1469 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 1470 LLE_WLOCK(lle); 1471 lle->la_flags = LLE_DELETED; 1472 EVENTHANDLER_INVOKE(arp_update_event, lle); 1473 LLE_WUNLOCK(lle); 1474#ifdef DIAGNOSTIC 1475 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 1476#endif 1477 } 1478 lle = (void *)-1; 1479 1480 } 1481 if (LLE_IS_VALID(lle)) { 1482 if (flags & LLE_EXCLUSIVE) 1483 LLE_WLOCK(lle); 1484 else 1485 LLE_RLOCK(lle); 1486 } 1487done: 1488 return (lle); 1489} 1490 1491static int 1492in_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 1493{ 1494#define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle)) 1495 struct ifnet *ifp = llt->llt_ifp; 1496 struct llentry *lle; 1497 /* XXX stack use */ 1498 struct { 1499 struct rt_msghdr rtm; 1500 struct sockaddr_inarp sin; 1501 struct sockaddr_dl sdl; 1502 } arpc; 1503 int error, i; 1504 1505 LLTABLE_LOCK_ASSERT(); 1506 1507 error = 0; 1508 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1509 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 1510 struct sockaddr_dl *sdl; 1511 1512 /* skip deleted entries */ 1513 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 1514 continue; 1515 /* Skip if jailed and not a valid IP of the prison. */ 1516 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 1517 continue; 1518 /* 1519 * produce a msg made of: 1520 * struct rt_msghdr; 1521 * struct sockaddr_inarp; (IPv4) 1522 * struct sockaddr_dl; 1523 */ 1524 bzero(&arpc, sizeof(arpc)); 1525 arpc.rtm.rtm_msglen = sizeof(arpc); 1526 arpc.rtm.rtm_version = RTM_VERSION; 1527 arpc.rtm.rtm_type = RTM_GET; 1528 arpc.rtm.rtm_flags = RTF_UP; 1529 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1530 arpc.sin.sin_family = AF_INET; 1531 arpc.sin.sin_len = sizeof(arpc.sin); 1532 arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr; 1533 1534 /* publish */ 1535 if (lle->la_flags & LLE_PUB) { 1536 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1537 /* proxy only */ 1538 if (lle->la_flags & LLE_PROXY) 1539 arpc.sin.sin_other = SIN_PROXY; 1540 } 1541 1542 sdl = &arpc.sdl; 1543 sdl->sdl_family = AF_LINK; 1544 sdl->sdl_len = sizeof(*sdl); 1545 sdl->sdl_index = ifp->if_index; 1546 sdl->sdl_type = ifp->if_type; 1547 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 1548 sdl->sdl_alen = ifp->if_addrlen; 1549 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1550 } else { 1551 sdl->sdl_alen = 0; 1552 bzero(LLADDR(sdl), ifp->if_addrlen); 1553 } 1554 1555 arpc.rtm.rtm_rmx.rmx_expire = 1556 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1557 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1558 if (lle->la_flags & LLE_STATIC) 1559 arpc.rtm.rtm_flags |= RTF_STATIC; 1560 arpc.rtm.rtm_index = ifp->if_index; 1561 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1562 if (error) 1563 break; 1564 } 1565 } 1566 return error; 1567#undef SIN 1568} 1569 1570void * 1571in_domifattach(struct ifnet *ifp) 1572{ 1573 struct in_ifinfo *ii; 1574 struct lltable *llt; 1575 1576 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); 1577 1578 llt = lltable_init(ifp, AF_INET); 1579 if (llt != NULL) { 1580 llt->llt_free = in_lltable_free; 1581 llt->llt_prefix_free = in_lltable_prefix_free; 1582 llt->llt_lookup = in_lltable_lookup; 1583 llt->llt_dump = in_lltable_dump; 1584 } 1585 ii->ii_llt = llt; 1586 1587 ii->ii_igmp = igmp_domifattach(ifp); 1588 1589 return ii; 1590} 1591 1592void 1593in_domifdetach(struct ifnet *ifp, void *aux) 1594{ 1595 struct in_ifinfo *ii = (struct in_ifinfo *)aux; 1596 1597 igmp_domifdetach(ifp); 1598 lltable_free(ii->ii_llt); 1599 free(ii, M_IFADDR); 1600} 1601