in.c revision 244678
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 244678 2012-12-25 13:01:58Z glebius $"); 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, 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 if this is its first 823 * address, and to validate the address if necessary. 824 * 825 * Historically, drivers managed IFF_UP flag theirselves, so we 826 * need to check whether driver did that. 827 */ 828 flags = ifp->if_flags; 829 if (ifp->if_ioctl != NULL && 830 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia)) != 0) 831 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 832 return (error); 833 if ((ifp->if_flags & IFF_UP) && (flags & IFF_UP) == 0) 834 if_up(ifp); 835 836 /* 837 * Be compatible with network classes, if netmask isn't supplied, 838 * guess it based on classes. 839 */ 840 if (!masksupplied) { 841 if (IN_CLASSA(i)) 842 ia->ia_subnetmask = IN_CLASSA_NET; 843 else if (IN_CLASSB(i)) 844 ia->ia_subnetmask = IN_CLASSB_NET; 845 else 846 ia->ia_subnetmask = IN_CLASSC_NET; 847 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 848 } 849 ia->ia_subnet = i & ia->ia_subnetmask; 850 in_socktrim(&ia->ia_sockmask); 851 852 /* 853 * Add route for the network. 854 */ 855 flags = RTF_UP; 856 ia->ia_ifa.ifa_metric = ifp->if_metric; 857 if (ifp->if_flags & IFF_BROADCAST) { 858 if (ia->ia_subnetmask == IN_RFC3021_MASK) 859 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST; 860 else 861 ia->ia_broadaddr.sin_addr.s_addr = 862 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 863 } else if (ifp->if_flags & IFF_LOOPBACK) { 864 ia->ia_dstaddr = ia->ia_addr; 865 flags |= RTF_HOST; 866 } else if (ifp->if_flags & IFF_POINTOPOINT) { 867 if (ia->ia_dstaddr.sin_family != AF_INET) 868 return (0); 869 flags |= RTF_HOST; 870 } 871 if (!vhid && (error = in_addprefix(ia, flags)) != 0) 872 return (error); 873 874 if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY) 875 return (0); 876 877 if (ifp->if_flags & IFF_POINTOPOINT && 878 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 879 return (0); 880 881 /* 882 * add a loopback route to self 883 */ 884 if (V_useloopback && !vhid && !(ifp->if_flags & IFF_LOOPBACK)) { 885 struct route ia_ro; 886 887 bzero(&ia_ro, sizeof(ia_ro)); 888 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = ia->ia_addr; 889 rtalloc_ign_fib(&ia_ro, 0, RT_DEFAULT_FIB); 890 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) && 891 (ia_ro.ro_rt->rt_ifp == V_loif)) { 892 RT_LOCK(ia_ro.ro_rt); 893 RT_ADDREF(ia_ro.ro_rt); 894 RTFREE_LOCKED(ia_ro.ro_rt); 895 } else 896 error = ifa_add_loopback_route((struct ifaddr *)ia, 897 (struct sockaddr *)&ia->ia_addr); 898 if (error == 0) 899 ia->ia_flags |= IFA_RTSELF; 900 if (ia_ro.ro_rt != NULL) 901 RTFREE(ia_ro.ro_rt); 902 } 903 904 return (error); 905} 906 907#define rtinitflags(x) \ 908 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 909 ? RTF_HOST : 0) 910 911/* 912 * Generate a routing message when inserting or deleting 913 * an interface address alias. 914 */ 915static void in_addralias_rtmsg(int cmd, struct in_addr *prefix, 916 struct in_ifaddr *target) 917{ 918 struct route pfx_ro; 919 struct sockaddr_in *pfx_addr; 920 struct rtentry msg_rt; 921 922 /* QL: XXX 923 * This is a bit questionable because there is no 924 * additional route entry added/deleted for an address 925 * alias. Therefore this route report is inaccurate. 926 */ 927 bzero(&pfx_ro, sizeof(pfx_ro)); 928 pfx_addr = (struct sockaddr_in *)(&pfx_ro.ro_dst); 929 pfx_addr->sin_len = sizeof(*pfx_addr); 930 pfx_addr->sin_family = AF_INET; 931 pfx_addr->sin_addr = *prefix; 932 rtalloc_ign_fib(&pfx_ro, 0, 0); 933 if (pfx_ro.ro_rt != NULL) { 934 msg_rt = *pfx_ro.ro_rt; 935 936 /* QL: XXX 937 * Point the gateway to the new interface 938 * address as if a new prefix route entry has 939 * been added through the new address alias. 940 * All other parts of the rtentry is accurate, 941 * e.g., rt_key, rt_mask, rt_ifp etc. 942 */ 943 msg_rt.rt_gateway = (struct sockaddr *)&target->ia_addr; 944 rt_newaddrmsg(cmd, (struct ifaddr *)target, 0, &msg_rt); 945 RTFREE(pfx_ro.ro_rt); 946 } 947 return; 948} 949 950/* 951 * Check if we have a route for the given prefix already or add one accordingly. 952 */ 953int 954in_addprefix(struct in_ifaddr *target, int flags) 955{ 956 struct in_ifaddr *ia; 957 struct in_addr prefix, mask, p, m; 958 int error; 959 960 if ((flags & RTF_HOST) != 0) { 961 prefix = target->ia_dstaddr.sin_addr; 962 mask.s_addr = 0; 963 } else { 964 prefix = target->ia_addr.sin_addr; 965 mask = target->ia_sockmask.sin_addr; 966 prefix.s_addr &= mask.s_addr; 967 } 968 969 IN_IFADDR_RLOCK(); 970 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 971 if (rtinitflags(ia)) { 972 p = ia->ia_dstaddr.sin_addr; 973 974 if (prefix.s_addr != p.s_addr) 975 continue; 976 } else { 977 p = ia->ia_addr.sin_addr; 978 m = ia->ia_sockmask.sin_addr; 979 p.s_addr &= m.s_addr; 980 981 if (prefix.s_addr != p.s_addr || 982 mask.s_addr != m.s_addr) 983 continue; 984 } 985 986 /* 987 * If we got a matching prefix route inserted by other 988 * interface address, we are done here. 989 */ 990 if (ia->ia_flags & IFA_ROUTE) { 991#ifdef RADIX_MPATH 992 if (ia->ia_addr.sin_addr.s_addr == 993 target->ia_addr.sin_addr.s_addr) { 994 IN_IFADDR_RUNLOCK(); 995 return (EEXIST); 996 } else 997 break; 998#endif 999 if (V_nosameprefix) { 1000 IN_IFADDR_RUNLOCK(); 1001 return (EEXIST); 1002 } else { 1003 in_addralias_rtmsg(RTM_ADD, &prefix, target); 1004 IN_IFADDR_RUNLOCK(); 1005 return (0); 1006 } 1007 } 1008 } 1009 IN_IFADDR_RUNLOCK(); 1010 1011 /* 1012 * No-one seem to have this prefix route, so we try to insert it. 1013 */ 1014 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 1015 if (!error) 1016 target->ia_flags |= IFA_ROUTE; 1017 return (error); 1018} 1019 1020/* 1021 * If there is no other address in the system that can serve a route to the 1022 * same prefix, remove the route. Hand over the route to the new address 1023 * otherwise. 1024 */ 1025int 1026in_scrubprefix(struct in_ifaddr *target, u_int flags) 1027{ 1028 struct in_ifaddr *ia; 1029 struct in_addr prefix, mask, p, m; 1030 int error = 0; 1031 struct sockaddr_in prefix0, mask0; 1032 1033 /* 1034 * Remove the loopback route to the interface address. 1035 * The "useloopback" setting is not consulted because if the 1036 * user configures an interface address, turns off this 1037 * setting, and then tries to delete that interface address, 1038 * checking the current setting of "useloopback" would leave 1039 * that interface address loopback route untouched, which 1040 * would be wrong. Therefore the interface address loopback route 1041 * deletion is unconditional. 1042 */ 1043 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) && 1044 !(target->ia_ifp->if_flags & IFF_LOOPBACK) && 1045 (target->ia_flags & IFA_RTSELF)) { 1046 struct route ia_ro; 1047 int freeit = 0; 1048 1049 bzero(&ia_ro, sizeof(ia_ro)); 1050 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = target->ia_addr; 1051 rtalloc_ign_fib(&ia_ro, 0, 0); 1052 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) && 1053 (ia_ro.ro_rt->rt_ifp == V_loif)) { 1054 RT_LOCK(ia_ro.ro_rt); 1055 if (ia_ro.ro_rt->rt_refcnt <= 1) 1056 freeit = 1; 1057 else if (flags & LLE_STATIC) { 1058 RT_REMREF(ia_ro.ro_rt); 1059 target->ia_flags &= ~IFA_RTSELF; 1060 } 1061 RTFREE_LOCKED(ia_ro.ro_rt); 1062 } 1063 if (freeit && (flags & LLE_STATIC)) { 1064 error = ifa_del_loopback_route((struct ifaddr *)target, 1065 (struct sockaddr *)&target->ia_addr); 1066 if (error == 0) 1067 target->ia_flags &= ~IFA_RTSELF; 1068 } 1069 if ((flags & LLE_STATIC) && 1070 !(target->ia_ifp->if_flags & IFF_NOARP)) 1071 /* remove arp cache */ 1072 arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr); 1073 } 1074 1075 if (rtinitflags(target)) { 1076 prefix = target->ia_dstaddr.sin_addr; 1077 mask.s_addr = 0; 1078 } else { 1079 prefix = target->ia_addr.sin_addr; 1080 mask = target->ia_sockmask.sin_addr; 1081 prefix.s_addr &= mask.s_addr; 1082 } 1083 1084 if ((target->ia_flags & IFA_ROUTE) == 0) { 1085 in_addralias_rtmsg(RTM_DELETE, &prefix, target); 1086 return (0); 1087 } 1088 1089 IN_IFADDR_RLOCK(); 1090 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1091 if (rtinitflags(ia)) { 1092 p = ia->ia_dstaddr.sin_addr; 1093 1094 if (prefix.s_addr != p.s_addr) 1095 continue; 1096 } else { 1097 p = ia->ia_addr.sin_addr; 1098 m = ia->ia_sockmask.sin_addr; 1099 p.s_addr &= m.s_addr; 1100 1101 if (prefix.s_addr != p.s_addr || 1102 mask.s_addr != m.s_addr) 1103 continue; 1104 } 1105 1106 if ((ia->ia_ifp->if_flags & IFF_UP) == 0) 1107 continue; 1108 1109 /* 1110 * If we got a matching prefix address, move IFA_ROUTE and 1111 * the route itself to it. Make sure that routing daemons 1112 * get a heads-up. 1113 */ 1114 if ((ia->ia_flags & IFA_ROUTE) == 0) { 1115 ifa_ref(&ia->ia_ifa); 1116 IN_IFADDR_RUNLOCK(); 1117 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, 1118 rtinitflags(target)); 1119 if (error == 0) 1120 target->ia_flags &= ~IFA_ROUTE; 1121 else 1122 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n", 1123 error); 1124 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 1125 rtinitflags(ia) | RTF_UP); 1126 if (error == 0) 1127 ia->ia_flags |= IFA_ROUTE; 1128 else 1129 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n", 1130 error); 1131 ifa_free(&ia->ia_ifa); 1132 return (error); 1133 } 1134 } 1135 IN_IFADDR_RUNLOCK(); 1136 1137 /* 1138 * remove all L2 entries on the given prefix 1139 */ 1140 bzero(&prefix0, sizeof(prefix0)); 1141 prefix0.sin_len = sizeof(prefix0); 1142 prefix0.sin_family = AF_INET; 1143 prefix0.sin_addr.s_addr = target->ia_subnet; 1144 bzero(&mask0, sizeof(mask0)); 1145 mask0.sin_len = sizeof(mask0); 1146 mask0.sin_family = AF_INET; 1147 mask0.sin_addr.s_addr = target->ia_subnetmask; 1148 lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0, 1149 (struct sockaddr *)&mask0, flags); 1150 1151 /* 1152 * As no-one seem to have this prefix, we can remove the route. 1153 */ 1154 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 1155 if (error == 0) 1156 target->ia_flags &= ~IFA_ROUTE; 1157 else 1158 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error); 1159 return (error); 1160} 1161 1162#undef rtinitflags 1163 1164/* 1165 * Return 1 if the address might be a local broadcast address. 1166 */ 1167int 1168in_broadcast(struct in_addr in, struct ifnet *ifp) 1169{ 1170 register struct ifaddr *ifa; 1171 u_long t; 1172 1173 if (in.s_addr == INADDR_BROADCAST || 1174 in.s_addr == INADDR_ANY) 1175 return (1); 1176 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1177 return (0); 1178 t = ntohl(in.s_addr); 1179 /* 1180 * Look through the list of addresses for a match 1181 * with a broadcast address. 1182 */ 1183#define ia ((struct in_ifaddr *)ifa) 1184 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1185 if (ifa->ifa_addr->sa_family == AF_INET && 1186 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1187 /* 1188 * Check for old-style (host 0) broadcast, but 1189 * taking into account that RFC 3021 obsoletes it. 1190 */ 1191 (ia->ia_subnetmask != IN_RFC3021_MASK && 1192 t == ia->ia_subnet)) && 1193 /* 1194 * Check for an all one subnetmask. These 1195 * only exist when an interface gets a secondary 1196 * address. 1197 */ 1198 ia->ia_subnetmask != (u_long)0xffffffff) 1199 return (1); 1200 return (0); 1201#undef ia 1202} 1203 1204/* 1205 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 1206 */ 1207void 1208in_ifdetach(struct ifnet *ifp) 1209{ 1210 1211 in_pcbpurgeif0(&V_ripcbinfo, ifp); 1212 in_pcbpurgeif0(&V_udbinfo, ifp); 1213 in_purgemaddrs(ifp); 1214} 1215 1216/* 1217 * Delete all IPv4 multicast address records, and associated link-layer 1218 * multicast address records, associated with ifp. 1219 * XXX It looks like domifdetach runs AFTER the link layer cleanup. 1220 * XXX This should not race with ifma_protospec being set during 1221 * a new allocation, if it does, we have bigger problems. 1222 */ 1223static void 1224in_purgemaddrs(struct ifnet *ifp) 1225{ 1226 LIST_HEAD(,in_multi) purgeinms; 1227 struct in_multi *inm, *tinm; 1228 struct ifmultiaddr *ifma; 1229 1230 LIST_INIT(&purgeinms); 1231 IN_MULTI_LOCK(); 1232 1233 /* 1234 * Extract list of in_multi associated with the detaching ifp 1235 * which the PF_INET layer is about to release. 1236 * We need to do this as IF_ADDR_LOCK() may be re-acquired 1237 * by code further down. 1238 */ 1239 IF_ADDR_RLOCK(ifp); 1240 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1241 if (ifma->ifma_addr->sa_family != AF_INET || 1242 ifma->ifma_protospec == NULL) 1243 continue; 1244#if 0 1245 KASSERT(ifma->ifma_protospec != NULL, 1246 ("%s: ifma_protospec is NULL", __func__)); 1247#endif 1248 inm = (struct in_multi *)ifma->ifma_protospec; 1249 LIST_INSERT_HEAD(&purgeinms, inm, inm_link); 1250 } 1251 IF_ADDR_RUNLOCK(ifp); 1252 1253 LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) { 1254 LIST_REMOVE(inm, inm_link); 1255 inm_release_locked(inm); 1256 } 1257 igmp_ifdetach(ifp); 1258 1259 IN_MULTI_UNLOCK(); 1260} 1261 1262struct in_llentry { 1263 struct llentry base; 1264 struct sockaddr_in l3_addr4; 1265}; 1266 1267/* 1268 * Deletes an address from the address table. 1269 * This function is called by the timer functions 1270 * such as arptimer() and nd6_llinfo_timer(), and 1271 * the caller does the locking. 1272 */ 1273static void 1274in_lltable_free(struct lltable *llt, struct llentry *lle) 1275{ 1276 LLE_WUNLOCK(lle); 1277 LLE_LOCK_DESTROY(lle); 1278 free(lle, M_LLTABLE); 1279} 1280 1281static struct llentry * 1282in_lltable_new(const struct sockaddr *l3addr, u_int flags) 1283{ 1284 struct in_llentry *lle; 1285 1286 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 1287 if (lle == NULL) /* NB: caller generates msg */ 1288 return NULL; 1289 1290 /* 1291 * For IPv4 this will trigger "arpresolve" to generate 1292 * an ARP request. 1293 */ 1294 lle->base.la_expire = time_uptime; /* mark expired */ 1295 lle->l3_addr4 = *(const struct sockaddr_in *)l3addr; 1296 lle->base.lle_refcnt = 1; 1297 lle->base.lle_free = in_lltable_free; 1298 LLE_LOCK_INIT(&lle->base); 1299 callout_init_rw(&lle->base.la_timer, &lle->base.lle_lock, 1300 CALLOUT_RETURNUNLOCKED); 1301 1302 return (&lle->base); 1303} 1304 1305#define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 1306 (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 ) 1307 1308static void 1309in_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix, 1310 const struct sockaddr *mask, u_int flags) 1311{ 1312 const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix; 1313 const struct sockaddr_in *msk = (const struct sockaddr_in *)mask; 1314 struct llentry *lle, *next; 1315 int i; 1316 size_t pkts_dropped; 1317 1318 IF_AFDATA_WLOCK(llt->llt_ifp); 1319 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1320 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 1321 /* 1322 * (flags & LLE_STATIC) means deleting all entries 1323 * including static ARP entries. 1324 */ 1325 if (IN_ARE_MASKED_ADDR_EQUAL(satosin(L3_ADDR(lle)), 1326 pfx, msk) && ((flags & LLE_STATIC) || 1327 !(lle->la_flags & LLE_STATIC))) { 1328 LLE_WLOCK(lle); 1329 if (callout_stop(&lle->la_timer)) 1330 LLE_REMREF(lle); 1331 pkts_dropped = llentry_free(lle); 1332 ARPSTAT_ADD(dropped, pkts_dropped); 1333 } 1334 } 1335 } 1336 IF_AFDATA_WUNLOCK(llt->llt_ifp); 1337} 1338 1339 1340static int 1341in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr) 1342{ 1343 struct rtentry *rt; 1344 1345 KASSERT(l3addr->sa_family == AF_INET, 1346 ("sin_family %d", l3addr->sa_family)); 1347 1348 /* XXX rtalloc1 should take a const param */ 1349 rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0); 1350 1351 if (rt == NULL) 1352 return (EINVAL); 1353 1354 /* 1355 * If the gateway for an existing host route matches the target L3 1356 * address, which is a special route inserted by some implementation 1357 * such as MANET, and the interface is of the correct type, then 1358 * allow for ARP to proceed. 1359 */ 1360 if (rt->rt_flags & RTF_GATEWAY) { 1361 if (!(rt->rt_flags & RTF_HOST) || !rt->rt_ifp || 1362 rt->rt_ifp->if_type != IFT_ETHER || 1363 (rt->rt_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 || 1364 memcmp(rt->rt_gateway->sa_data, l3addr->sa_data, 1365 sizeof(in_addr_t)) != 0) { 1366 RTFREE_LOCKED(rt); 1367 return (EINVAL); 1368 } 1369 } 1370 1371 /* 1372 * Make sure that at least the destination address is covered 1373 * by the route. This is for handling the case where 2 or more 1374 * interfaces have the same prefix. An incoming packet arrives 1375 * on one interface and the corresponding outgoing packet leaves 1376 * another interface. 1377 */ 1378 if (!(rt->rt_flags & RTF_HOST) && rt->rt_ifp != ifp) { 1379 const char *sa, *mask, *addr, *lim; 1380 int len; 1381 1382 mask = (const char *)rt_mask(rt); 1383 /* 1384 * Just being extra cautious to avoid some custom 1385 * code getting into trouble. 1386 */ 1387 if (mask == NULL) { 1388 RTFREE_LOCKED(rt); 1389 return (EINVAL); 1390 } 1391 1392 sa = (const char *)rt_key(rt); 1393 addr = (const char *)l3addr; 1394 len = ((const struct sockaddr_in *)l3addr)->sin_len; 1395 lim = addr + len; 1396 1397 for ( ; addr < lim; sa++, mask++, addr++) { 1398 if ((*sa ^ *addr) & *mask) { 1399#ifdef DIAGNOSTIC 1400 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n", 1401 inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr)); 1402#endif 1403 RTFREE_LOCKED(rt); 1404 return (EINVAL); 1405 } 1406 } 1407 } 1408 1409 RTFREE_LOCKED(rt); 1410 return (0); 1411} 1412 1413/* 1414 * Return NULL if not found or marked for deletion. 1415 * If found return lle read locked. 1416 */ 1417static struct llentry * 1418in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1419{ 1420 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1421 struct ifnet *ifp = llt->llt_ifp; 1422 struct llentry *lle; 1423 struct llentries *lleh; 1424 u_int hashkey; 1425 1426 IF_AFDATA_LOCK_ASSERT(ifp); 1427 KASSERT(l3addr->sa_family == AF_INET, 1428 ("sin_family %d", l3addr->sa_family)); 1429 1430 hashkey = sin->sin_addr.s_addr; 1431 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 1432 LIST_FOREACH(lle, lleh, lle_next) { 1433 struct sockaddr_in *sa2 = satosin(L3_ADDR(lle)); 1434 if (lle->la_flags & LLE_DELETED) 1435 continue; 1436 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr) 1437 break; 1438 } 1439 if (lle == NULL) { 1440#ifdef DIAGNOSTIC 1441 if (flags & LLE_DELETE) 1442 log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle); 1443#endif 1444 if (!(flags & LLE_CREATE)) 1445 return (NULL); 1446 /* 1447 * A route that covers the given address must have 1448 * been installed 1st because we are doing a resolution, 1449 * verify this. 1450 */ 1451 if (!(flags & LLE_IFADDR) && 1452 in_lltable_rtcheck(ifp, flags, l3addr) != 0) 1453 goto done; 1454 1455 lle = in_lltable_new(l3addr, flags); 1456 if (lle == NULL) { 1457 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 1458 goto done; 1459 } 1460 lle->la_flags = flags & ~LLE_CREATE; 1461 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 1462 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 1463 lle->la_flags |= (LLE_VALID | LLE_STATIC); 1464 } 1465 1466 lle->lle_tbl = llt; 1467 lle->lle_head = lleh; 1468 lle->la_flags |= LLE_LINKED; 1469 LIST_INSERT_HEAD(lleh, lle, lle_next); 1470 } else if (flags & LLE_DELETE) { 1471 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 1472 LLE_WLOCK(lle); 1473 lle->la_flags |= LLE_DELETED; 1474 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 1475 LLE_WUNLOCK(lle); 1476#ifdef DIAGNOSTIC 1477 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 1478#endif 1479 } 1480 lle = (void *)-1; 1481 1482 } 1483 if (LLE_IS_VALID(lle)) { 1484 if (flags & LLE_EXCLUSIVE) 1485 LLE_WLOCK(lle); 1486 else 1487 LLE_RLOCK(lle); 1488 } 1489done: 1490 return (lle); 1491} 1492 1493static int 1494in_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 1495{ 1496#define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle)) 1497 struct ifnet *ifp = llt->llt_ifp; 1498 struct llentry *lle; 1499 /* XXX stack use */ 1500 struct { 1501 struct rt_msghdr rtm; 1502 struct sockaddr_inarp sin; 1503 struct sockaddr_dl sdl; 1504 } arpc; 1505 int error, i; 1506 1507 LLTABLE_LOCK_ASSERT(); 1508 1509 error = 0; 1510 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1511 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 1512 struct sockaddr_dl *sdl; 1513 1514 /* skip deleted entries */ 1515 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 1516 continue; 1517 /* Skip if jailed and not a valid IP of the prison. */ 1518 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 1519 continue; 1520 /* 1521 * produce a msg made of: 1522 * struct rt_msghdr; 1523 * struct sockaddr_inarp; (IPv4) 1524 * struct sockaddr_dl; 1525 */ 1526 bzero(&arpc, sizeof(arpc)); 1527 arpc.rtm.rtm_msglen = sizeof(arpc); 1528 arpc.rtm.rtm_version = RTM_VERSION; 1529 arpc.rtm.rtm_type = RTM_GET; 1530 arpc.rtm.rtm_flags = RTF_UP; 1531 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1532 arpc.sin.sin_family = AF_INET; 1533 arpc.sin.sin_len = sizeof(arpc.sin); 1534 arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr; 1535 1536 /* publish */ 1537 if (lle->la_flags & LLE_PUB) { 1538 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1539 /* proxy only */ 1540 if (lle->la_flags & LLE_PROXY) 1541 arpc.sin.sin_other = SIN_PROXY; 1542 } 1543 1544 sdl = &arpc.sdl; 1545 sdl->sdl_family = AF_LINK; 1546 sdl->sdl_len = sizeof(*sdl); 1547 sdl->sdl_index = ifp->if_index; 1548 sdl->sdl_type = ifp->if_type; 1549 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 1550 sdl->sdl_alen = ifp->if_addrlen; 1551 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1552 } else { 1553 sdl->sdl_alen = 0; 1554 bzero(LLADDR(sdl), ifp->if_addrlen); 1555 } 1556 1557 arpc.rtm.rtm_rmx.rmx_expire = 1558 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1559 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1560 if (lle->la_flags & LLE_STATIC) 1561 arpc.rtm.rtm_flags |= RTF_STATIC; 1562 arpc.rtm.rtm_index = ifp->if_index; 1563 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1564 if (error) 1565 break; 1566 } 1567 } 1568 return error; 1569#undef SIN 1570} 1571 1572void * 1573in_domifattach(struct ifnet *ifp) 1574{ 1575 struct in_ifinfo *ii; 1576 struct lltable *llt; 1577 1578 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); 1579 1580 llt = lltable_init(ifp, AF_INET); 1581 if (llt != NULL) { 1582 llt->llt_prefix_free = in_lltable_prefix_free; 1583 llt->llt_lookup = in_lltable_lookup; 1584 llt->llt_dump = in_lltable_dump; 1585 } 1586 ii->ii_llt = llt; 1587 1588 ii->ii_igmp = igmp_domifattach(ifp); 1589 1590 return ii; 1591} 1592 1593void 1594in_domifdetach(struct ifnet *ifp, void *aux) 1595{ 1596 struct in_ifinfo *ii = (struct in_ifinfo *)aux; 1597 1598 igmp_domifdetach(ifp); 1599 lltable_free(ii->ii_llt); 1600 free(ii, M_IFADDR); 1601} 1602