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("$FreeBSD$"); 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, sameprefixcarponly); 80#define V_sameprefixcarponly VNET(sameprefixcarponly) 81SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, same_prefix_carp_only, CTLFLAG_RW, 82 &VNET_NAME(sameprefixcarponly), 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 struct sockaddr_in oldaddr; 224 int error, hostIsNew, iaIsNew, maskIsNew; 225 int iaIsFirst; 226 227 ia = NULL; 228 iaIsFirst = 0; 229 iaIsNew = 0; 230 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 231 232 /* 233 * Filter out ioctls we implement directly; forward the rest on to 234 * in_lifaddr_ioctl() and ifp->if_ioctl(). 235 */ 236 switch (cmd) { 237 case SIOCAIFADDR: 238 case SIOCDIFADDR: 239 case SIOCGIFADDR: 240 case SIOCGIFBRDADDR: 241 case SIOCGIFDSTADDR: 242 case SIOCGIFNETMASK: 243 case SIOCSIFADDR: 244 case SIOCSIFBRDADDR: 245 case SIOCSIFDSTADDR: 246 case SIOCSIFNETMASK: 247 break; 248 249 case SIOCALIFADDR: 250 if (td != NULL) { 251 error = priv_check(td, PRIV_NET_ADDIFADDR); 252 if (error) 253 return (error); 254 } 255 if (ifp == NULL) 256 return (EINVAL); 257 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 258 259 case SIOCDLIFADDR: 260 if (td != NULL) { 261 error = priv_check(td, PRIV_NET_DELIFADDR); 262 if (error) 263 return (error); 264 } 265 if (ifp == NULL) 266 return (EINVAL); 267 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 268 269 case SIOCGLIFADDR: 270 if (ifp == NULL) 271 return (EINVAL); 272 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 273 274 default: 275 if (ifp == NULL || ifp->if_ioctl == NULL) 276 return (EOPNOTSUPP); 277 return ((*ifp->if_ioctl)(ifp, cmd, data)); 278 } 279 280 if (ifp == NULL) 281 return (EADDRNOTAVAIL); 282 283 /* 284 * Security checks before we get involved in any work. 285 */ 286 switch (cmd) { 287 case SIOCAIFADDR: 288 case SIOCSIFADDR: 289 case SIOCSIFBRDADDR: 290 case SIOCSIFNETMASK: 291 case SIOCSIFDSTADDR: 292 if (td != NULL) { 293 error = priv_check(td, PRIV_NET_ADDIFADDR); 294 if (error) 295 return (error); 296 } 297 break; 298 299 case SIOCDIFADDR: 300 if (td != NULL) { 301 error = priv_check(td, PRIV_NET_DELIFADDR); 302 if (error) 303 return (error); 304 } 305 break; 306 } 307 308 /* 309 * Find address for this interface, if it exists. 310 * 311 * If an alias address was specified, find that one instead of the 312 * first one on the interface, if possible. 313 */ 314 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 315 IN_IFADDR_RLOCK(); 316 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) { 317 if (iap->ia_ifp == ifp && 318 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 319 if (td == NULL || prison_check_ip4(td->td_ucred, 320 &dst) == 0) 321 ia = iap; 322 break; 323 } 324 } 325 if (ia != NULL) 326 ifa_ref(&ia->ia_ifa); 327 IN_IFADDR_RUNLOCK(); 328 if (ia == NULL) { 329 IF_ADDR_RLOCK(ifp); 330 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 331 iap = ifatoia(ifa); 332 if (iap->ia_addr.sin_family == AF_INET) { 333 if (td != NULL && 334 prison_check_ip4(td->td_ucred, 335 &iap->ia_addr.sin_addr) != 0) 336 continue; 337 ia = iap; 338 break; 339 } 340 } 341 if (ia != NULL) 342 ifa_ref(&ia->ia_ifa); 343 IF_ADDR_RUNLOCK(ifp); 344 } 345 if (ia == NULL) 346 iaIsFirst = 1; 347 348 error = 0; 349 switch (cmd) { 350 case SIOCAIFADDR: 351 case SIOCDIFADDR: 352 if (ifra->ifra_addr.sin_family == AF_INET) { 353 struct in_ifaddr *oia; 354 355 IN_IFADDR_RLOCK(); 356 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 357 if (ia->ia_ifp == ifp && 358 ia->ia_addr.sin_addr.s_addr == 359 ifra->ifra_addr.sin_addr.s_addr) 360 break; 361 } 362 if (ia != NULL && ia != oia) 363 ifa_ref(&ia->ia_ifa); 364 if (oia != NULL && ia != oia) 365 ifa_free(&oia->ia_ifa); 366 IN_IFADDR_RUNLOCK(); 367 if ((ifp->if_flags & IFF_POINTOPOINT) 368 && (cmd == SIOCAIFADDR) 369 && (ifra->ifra_dstaddr.sin_addr.s_addr 370 == INADDR_ANY)) { 371 error = EDESTADDRREQ; 372 goto out; 373 } 374 } 375 if (cmd == SIOCDIFADDR && ia == NULL) { 376 error = EADDRNOTAVAIL; 377 goto out; 378 } 379 /* FALLTHROUGH */ 380 case SIOCSIFADDR: 381 case SIOCSIFNETMASK: 382 case SIOCSIFDSTADDR: 383 if (ia == NULL) { 384 ia = (struct in_ifaddr *) 385 malloc(sizeof *ia, M_IFADDR, M_NOWAIT | 386 M_ZERO); 387 if (ia == NULL) { 388 error = ENOBUFS; 389 goto out; 390 } 391 392 ifa = &ia->ia_ifa; 393 ifa_init(ifa); 394 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 395 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 396 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 397 398 ia->ia_sockmask.sin_len = 8; 399 ia->ia_sockmask.sin_family = AF_INET; 400 if (ifp->if_flags & IFF_BROADCAST) { 401 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 402 ia->ia_broadaddr.sin_family = AF_INET; 403 } 404 ia->ia_ifp = ifp; 405 406 ifa_ref(ifa); /* if_addrhead */ 407 IF_ADDR_WLOCK(ifp); 408 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 409 IF_ADDR_WUNLOCK(ifp); 410 ifa_ref(ifa); /* in_ifaddrhead */ 411 IN_IFADDR_WLOCK(); 412 TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link); 413 IN_IFADDR_WUNLOCK(); 414 iaIsNew = 1; 415 } 416 break; 417 418 case SIOCSIFBRDADDR: 419 case SIOCGIFADDR: 420 case SIOCGIFNETMASK: 421 case SIOCGIFDSTADDR: 422 case SIOCGIFBRDADDR: 423 if (ia == NULL) { 424 error = EADDRNOTAVAIL; 425 goto out; 426 } 427 break; 428 } 429 430 /* 431 * Most paths in this switch return directly or via out. Only paths 432 * that remove the address break in order to hit common removal code. 433 */ 434 switch (cmd) { 435 case SIOCGIFADDR: 436 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 437 goto out; 438 439 case SIOCGIFBRDADDR: 440 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 441 error = EINVAL; 442 goto out; 443 } 444 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 445 goto out; 446 447 case SIOCGIFDSTADDR: 448 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 449 error = EINVAL; 450 goto out; 451 } 452 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 453 goto out; 454 455 case SIOCGIFNETMASK: 456 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 457 goto out; 458 459 case SIOCSIFDSTADDR: 460 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 461 error = EINVAL; 462 goto out; 463 } 464 oldaddr = ia->ia_dstaddr; 465 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 466 if (ifp->if_ioctl != NULL) { 467 error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, 468 (caddr_t)ia); 469 if (error) { 470 ia->ia_dstaddr = oldaddr; 471 goto out; 472 } 473 } 474 if (ia->ia_flags & IFA_ROUTE) { 475 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 476 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 477 ia->ia_ifa.ifa_dstaddr = 478 (struct sockaddr *)&ia->ia_dstaddr; 479 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 480 } 481 goto out; 482 483 case SIOCSIFBRDADDR: 484 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 485 error = EINVAL; 486 goto out; 487 } 488 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 489 goto out; 490 491 case SIOCSIFADDR: 492 error = in_ifinit(ifp, ia, 493 (struct sockaddr_in *) &ifr->ifr_addr, 1); 494 if (error != 0 && iaIsNew) 495 break; 496 if (error == 0) { 497 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 498 if (iaIsFirst && 499 (ifp->if_flags & IFF_MULTICAST) != 0) { 500 error = in_joingroup(ifp, &allhosts_addr, 501 NULL, &ii->ii_allhosts); 502 } 503 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 504 } 505 error = 0; 506 goto out; 507 508 case SIOCSIFNETMASK: 509 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 510 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 511 goto out; 512 513 case SIOCAIFADDR: 514 maskIsNew = 0; 515 hostIsNew = 1; 516 error = 0; 517 if (ia->ia_addr.sin_family == AF_INET) { 518 if (ifra->ifra_addr.sin_len == 0) { 519 ifra->ifra_addr = ia->ia_addr; 520 hostIsNew = 0; 521 } else if (ifra->ifra_addr.sin_addr.s_addr == 522 ia->ia_addr.sin_addr.s_addr) 523 hostIsNew = 0; 524 } 525 if (ifra->ifra_mask.sin_len) { 526 /* 527 * QL: XXX 528 * Need to scrub the prefix here in case 529 * the issued command is SIOCAIFADDR with 530 * the same address, but with a different 531 * prefix length. And if the prefix length 532 * is the same as before, then the call is 533 * un-necessarily executed here. 534 */ 535 in_ifscrub(ifp, ia, LLE_STATIC); 536 ia->ia_sockmask = ifra->ifra_mask; 537 ia->ia_sockmask.sin_family = AF_INET; 538 ia->ia_subnetmask = 539 ntohl(ia->ia_sockmask.sin_addr.s_addr); 540 maskIsNew = 1; 541 } 542 if ((ifp->if_flags & IFF_POINTOPOINT) && 543 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 544 in_ifscrub(ifp, ia, LLE_STATIC); 545 ia->ia_dstaddr = ifra->ifra_dstaddr; 546 maskIsNew = 1; /* We lie; but the effect's the same */ 547 } 548 if (ifra->ifra_addr.sin_family == AF_INET && 549 (hostIsNew || maskIsNew)) 550 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 551 if (error != 0 && iaIsNew) 552 break; 553 554 if ((ifp->if_flags & IFF_BROADCAST) && 555 (ifra->ifra_broadaddr.sin_family == AF_INET)) 556 ia->ia_broadaddr = ifra->ifra_broadaddr; 557 if (error == 0) { 558 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 559 if (iaIsFirst && 560 (ifp->if_flags & IFF_MULTICAST) != 0) { 561 error = in_joingroup(ifp, &allhosts_addr, 562 NULL, &ii->ii_allhosts); 563 } 564 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 565 } 566 goto out; 567 568 case SIOCDIFADDR: 569 /* 570 * in_ifscrub kills the interface route. 571 */ 572 in_ifscrub(ifp, ia, LLE_STATIC); 573 574 /* 575 * in_ifadown gets rid of all the rest of 576 * the routes. This is not quite the right 577 * thing to do, but at least if we are running 578 * a routing process they will come back. 579 */ 580 in_ifadown(&ia->ia_ifa, 1); 581 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 582 error = 0; 583 break; 584 585 default: 586 panic("in_control: unsupported ioctl"); 587 } 588 589 IF_ADDR_WLOCK(ifp); 590 /* Re-check that ia is still part of the list. */ 591 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 592 if (ifa == &ia->ia_ifa) 593 break; 594 } 595 if (ifa == NULL) { 596 /* 597 * If we lost the race with another thread, there is no need to 598 * try it again for the next loop as there is no other exit 599 * path between here and out. 600 */ 601 IF_ADDR_WUNLOCK(ifp); 602 error = EADDRNOTAVAIL; 603 goto out; 604 } 605 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 606 IF_ADDR_WUNLOCK(ifp); 607 ifa_free(&ia->ia_ifa); /* if_addrhead */ 608 609 IN_IFADDR_WLOCK(); 610 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link); 611 if (ia->ia_addr.sin_family == AF_INET) { 612 struct in_ifaddr *if_ia; 613 614 LIST_REMOVE(ia, ia_hash); 615 IN_IFADDR_WUNLOCK(); 616 /* 617 * If this is the last IPv4 address configured on this 618 * interface, leave the all-hosts group. 619 * No state-change report need be transmitted. 620 */ 621 if_ia = NULL; 622 IFP_TO_IA(ifp, if_ia); 623 if (if_ia == NULL) { 624 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 625 IN_MULTI_LOCK(); 626 if (ii->ii_allhosts) { 627 (void)in_leavegroup_locked(ii->ii_allhosts, 628 NULL); 629 ii->ii_allhosts = NULL; 630 } 631 IN_MULTI_UNLOCK(); 632 } else 633 ifa_free(&if_ia->ia_ifa); 634 } else 635 IN_IFADDR_WUNLOCK(); 636 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 637out: 638 if (ia != NULL) 639 ifa_free(&ia->ia_ifa); 640 return (error); 641} 642 643/* 644 * SIOC[GAD]LIFADDR. 645 * SIOCGLIFADDR: get first address. (?!?) 646 * SIOCGLIFADDR with IFLR_PREFIX: 647 * get first address that matches the specified prefix. 648 * SIOCALIFADDR: add the specified address. 649 * SIOCALIFADDR with IFLR_PREFIX: 650 * EINVAL since we can't deduce hostid part of the address. 651 * SIOCDLIFADDR: delete the specified address. 652 * SIOCDLIFADDR with IFLR_PREFIX: 653 * delete the first address that matches the specified prefix. 654 * return values: 655 * EINVAL on invalid parameters 656 * EADDRNOTAVAIL on prefix match failed/specified address not found 657 * other values may be returned from in_ioctl() 658 */ 659static int 660in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 661 struct ifnet *ifp, struct thread *td) 662{ 663 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 664 struct ifaddr *ifa; 665 666 /* sanity checks */ 667 if (data == NULL || ifp == NULL) { 668 panic("invalid argument to in_lifaddr_ioctl"); 669 /*NOTRECHED*/ 670 } 671 672 switch (cmd) { 673 case SIOCGLIFADDR: 674 /* address must be specified on GET with IFLR_PREFIX */ 675 if ((iflr->flags & IFLR_PREFIX) == 0) 676 break; 677 /*FALLTHROUGH*/ 678 case SIOCALIFADDR: 679 case SIOCDLIFADDR: 680 /* address must be specified on ADD and DELETE */ 681 if (iflr->addr.ss_family != AF_INET) 682 return (EINVAL); 683 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 684 return (EINVAL); 685 /* XXX need improvement */ 686 if (iflr->dstaddr.ss_family 687 && iflr->dstaddr.ss_family != AF_INET) 688 return (EINVAL); 689 if (iflr->dstaddr.ss_family 690 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 691 return (EINVAL); 692 break; 693 default: /*shouldn't happen*/ 694 return (EOPNOTSUPP); 695 } 696 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 697 return (EINVAL); 698 699 switch (cmd) { 700 case SIOCALIFADDR: 701 { 702 struct in_aliasreq ifra; 703 704 if (iflr->flags & IFLR_PREFIX) 705 return (EINVAL); 706 707 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR). */ 708 bzero(&ifra, sizeof(ifra)); 709 bcopy(iflr->iflr_name, ifra.ifra_name, 710 sizeof(ifra.ifra_name)); 711 712 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 713 714 if (iflr->dstaddr.ss_family) { /*XXX*/ 715 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 716 iflr->dstaddr.ss_len); 717 } 718 719 ifra.ifra_mask.sin_family = AF_INET; 720 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 721 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 722 723 return (in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td)); 724 } 725 case SIOCGLIFADDR: 726 case SIOCDLIFADDR: 727 { 728 struct in_ifaddr *ia; 729 struct in_addr mask, candidate, match; 730 struct sockaddr_in *sin; 731 732 bzero(&mask, sizeof(mask)); 733 bzero(&match, sizeof(match)); 734 if (iflr->flags & IFLR_PREFIX) { 735 /* lookup a prefix rather than address. */ 736 in_len2mask(&mask, iflr->prefixlen); 737 738 sin = (struct sockaddr_in *)&iflr->addr; 739 match.s_addr = sin->sin_addr.s_addr; 740 match.s_addr &= mask.s_addr; 741 742 /* if you set extra bits, that's wrong */ 743 if (match.s_addr != sin->sin_addr.s_addr) 744 return (EINVAL); 745 746 } else { 747 /* on getting an address, take the 1st match */ 748 /* on deleting an address, do exact match */ 749 if (cmd != SIOCGLIFADDR) { 750 in_len2mask(&mask, 32); 751 sin = (struct sockaddr_in *)&iflr->addr; 752 match.s_addr = sin->sin_addr.s_addr; 753 } 754 } 755 756 IF_ADDR_RLOCK(ifp); 757 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 758 if (ifa->ifa_addr->sa_family != AF_INET) 759 continue; 760 if (match.s_addr == 0) 761 break; 762 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 763 candidate.s_addr &= mask.s_addr; 764 if (candidate.s_addr == match.s_addr) 765 break; 766 } 767 if (ifa != NULL) 768 ifa_ref(ifa); 769 IF_ADDR_RUNLOCK(ifp); 770 if (ifa == NULL) 771 return (EADDRNOTAVAIL); 772 ia = (struct in_ifaddr *)ifa; 773 774 if (cmd == SIOCGLIFADDR) { 775 /* fill in the if_laddrreq structure */ 776 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 777 778 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 779 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 780 ia->ia_dstaddr.sin_len); 781 } else 782 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 783 784 iflr->prefixlen = 785 in_mask2len(&ia->ia_sockmask.sin_addr); 786 787 iflr->flags = 0; /*XXX*/ 788 ifa_free(ifa); 789 790 return (0); 791 } else { 792 struct in_aliasreq ifra; 793 794 /* fill in_aliasreq and do ioctl(SIOCDIFADDR) */ 795 bzero(&ifra, sizeof(ifra)); 796 bcopy(iflr->iflr_name, ifra.ifra_name, 797 sizeof(ifra.ifra_name)); 798 799 bcopy(&ia->ia_addr, &ifra.ifra_addr, 800 ia->ia_addr.sin_len); 801 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 802 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 803 ia->ia_dstaddr.sin_len); 804 } 805 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 806 ia->ia_sockmask.sin_len); 807 ifa_free(ifa); 808 809 return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 810 ifp, td)); 811 } 812 } 813 } 814 815 return (EOPNOTSUPP); /*just for safety*/ 816} 817 818/* 819 * Delete any existing route for an interface. 820 */ 821void 822in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia, u_int flags) 823{ 824 825 in_scrubprefix(ia, flags); 826} 827 828/* 829 * Initialize an interface's internet address 830 * and routing table entry. 831 */ 832static int 833in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, 834 int scrub) 835{ 836 register u_long i = ntohl(sin->sin_addr.s_addr); 837 struct sockaddr_in oldaddr; 838 int s = splimp(), flags = RTF_UP, error = 0; 839 840 oldaddr = ia->ia_addr; 841 if (oldaddr.sin_family == AF_INET) 842 LIST_REMOVE(ia, ia_hash); 843 ia->ia_addr = *sin; 844 if (ia->ia_addr.sin_family == AF_INET) { 845 IN_IFADDR_WLOCK(); 846 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 847 ia, ia_hash); 848 IN_IFADDR_WUNLOCK(); 849 } 850 /* 851 * Give the interface a chance to initialize 852 * if this is its first address, 853 * and to validate the address if necessary. 854 */ 855 if (ifp->if_ioctl != NULL) { 856 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 857 if (error) { 858 splx(s); 859 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 860 ia->ia_addr = oldaddr; 861 IN_IFADDR_WLOCK(); 862 if (ia->ia_addr.sin_family == AF_INET) 863 LIST_INSERT_HEAD(INADDR_HASH( 864 ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 865 else 866 /* 867 * If oldaddr family is not AF_INET (e.g. 868 * interface has been just created) in_control 869 * does not call LIST_REMOVE, and we end up 870 * with bogus ia entries in hash 871 */ 872 LIST_REMOVE(ia, ia_hash); 873 IN_IFADDR_WUNLOCK(); 874 return (error); 875 } 876 } 877 splx(s); 878 if (scrub) { 879 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 880 in_ifscrub(ifp, ia, LLE_STATIC); 881 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 882 } 883 /* 884 * Be compatible with network classes, if netmask isn't supplied, 885 * guess it based on classes. 886 */ 887 if (ia->ia_subnetmask == 0) { 888 if (IN_CLASSA(i)) 889 ia->ia_subnetmask = IN_CLASSA_NET; 890 else if (IN_CLASSB(i)) 891 ia->ia_subnetmask = IN_CLASSB_NET; 892 else 893 ia->ia_subnetmask = IN_CLASSC_NET; 894 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 895 } 896 ia->ia_subnet = i & ia->ia_subnetmask; 897 in_socktrim(&ia->ia_sockmask); 898 /* 899 * XXX: carp(4) does not have interface route 900 */ 901 if (ifp->if_type == IFT_CARP) 902 return (0); 903 /* 904 * Add route for the network. 905 */ 906 ia->ia_ifa.ifa_metric = ifp->if_metric; 907 if (ifp->if_flags & IFF_BROADCAST) { 908 if (ia->ia_subnetmask == IN_RFC3021_MASK) 909 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST; 910 else 911 ia->ia_broadaddr.sin_addr.s_addr = 912 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 913 } else if (ifp->if_flags & IFF_LOOPBACK) { 914 ia->ia_dstaddr = ia->ia_addr; 915 flags |= RTF_HOST; 916 } else if (ifp->if_flags & IFF_POINTOPOINT) { 917 if (ia->ia_dstaddr.sin_family != AF_INET) 918 return (0); 919 flags |= RTF_HOST; 920 } 921 if ((error = in_addprefix(ia, flags)) != 0) 922 return (error); 923 924 if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY) 925 return (0); 926 927 if (ifp->if_flags & IFF_POINTOPOINT) { 928 if (ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 929 return (0); 930 } 931 932 933 /* 934 * add a loopback route to self 935 */ 936 if (V_useloopback && !(ifp->if_flags & IFF_LOOPBACK)) { 937 struct route ia_ro; 938 939 bzero(&ia_ro, sizeof(ia_ro)); 940 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = ia->ia_addr; 941 rtalloc_ign_fib(&ia_ro, 0, RT_DEFAULT_FIB); 942 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) && 943 (ia_ro.ro_rt->rt_ifp == V_loif)) { 944 RT_LOCK(ia_ro.ro_rt); 945 RT_ADDREF(ia_ro.ro_rt); 946 RTFREE_LOCKED(ia_ro.ro_rt); 947 } else 948 error = ifa_add_loopback_route((struct ifaddr *)ia, 949 (struct sockaddr *)&ia->ia_addr); 950 if (error == 0) 951 ia->ia_flags |= IFA_RTSELF; 952 if (ia_ro.ro_rt != NULL) 953 RTFREE(ia_ro.ro_rt); 954 } 955 956 return (error); 957} 958 959#define rtinitflags(x) \ 960 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 961 ? RTF_HOST : 0) 962 963/* 964 * Check if we have a route for the given prefix already or add one accordingly. 965 */ 966static int 967in_addprefix(struct in_ifaddr *target, int flags) 968{ 969 struct in_ifaddr *ia; 970 struct in_addr prefix, mask, p, m; 971 int error, fibnum; 972 973 if ((flags & RTF_HOST) != 0) { 974 prefix = target->ia_dstaddr.sin_addr; 975 mask.s_addr = 0; 976 } else { 977 prefix = target->ia_addr.sin_addr; 978 mask = target->ia_sockmask.sin_addr; 979 prefix.s_addr &= mask.s_addr; 980 } 981 982 fibnum = rt_add_addr_allfibs ? RT_ALL_FIBS : target->ia_ifp->if_fib; 983 984 IN_IFADDR_RLOCK(); 985 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 986 if (rtinitflags(ia)) { 987 p = ia->ia_dstaddr.sin_addr; 988 989 if (prefix.s_addr != p.s_addr) 990 continue; 991 } else { 992 p = ia->ia_addr.sin_addr; 993 m = ia->ia_sockmask.sin_addr; 994 p.s_addr &= m.s_addr; 995 996 if (prefix.s_addr != p.s_addr || 997 mask.s_addr != m.s_addr) 998 continue; 999 } 1000 1001 /* 1002 * If we got a matching prefix route inserted by other 1003 * interface address, we are done here. 1004 */ 1005 if (ia->ia_flags & IFA_ROUTE) { 1006#ifdef RADIX_MPATH 1007 if (ia->ia_addr.sin_addr.s_addr == 1008 target->ia_addr.sin_addr.s_addr) { 1009 IN_IFADDR_RUNLOCK(); 1010 return (EEXIST); 1011 } else 1012 break; 1013#endif 1014 if (V_sameprefixcarponly && 1015 target->ia_ifp->if_type != IFT_CARP && 1016 ia->ia_ifp->if_type != IFT_CARP) { 1017 IN_IFADDR_RUNLOCK(); 1018 return (EEXIST); 1019 } else { 1020 rt_addrmsg(RTM_ADD, &target->ia_ifa, fibnum); 1021 IN_IFADDR_RUNLOCK(); 1022 return (0); 1023 } 1024 } 1025 } 1026 IN_IFADDR_RUNLOCK(); 1027 1028 /* 1029 * No-one seem to have this prefix route, so we try to insert it. 1030 */ 1031 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 1032 if (!error) 1033 target->ia_flags |= IFA_ROUTE; 1034 return (error); 1035} 1036 1037extern void arp_ifscrub(struct ifnet *ifp, uint32_t addr); 1038 1039/* 1040 * If there is no other address in the system that can serve a route to the 1041 * same prefix, remove the route. Hand over the route to the new address 1042 * otherwise. 1043 */ 1044static int 1045in_scrubprefix(struct in_ifaddr *target, u_int flags) 1046{ 1047 struct in_ifaddr *ia; 1048 struct in_addr prefix, mask, p; 1049 int error = 0, fibnum; 1050 struct sockaddr_in prefix0, mask0; 1051 1052 fibnum = rt_add_addr_allfibs ? RT_ALL_FIBS : target->ia_ifp->if_fib; 1053 1054 /* 1055 * Remove the loopback route to the interface address. 1056 * The "useloopback" setting is not consulted because if the 1057 * user configures an interface address, turns off this 1058 * setting, and then tries to delete that interface address, 1059 * checking the current setting of "useloopback" would leave 1060 * that interface address loopback route untouched, which 1061 * would be wrong. Therefore the interface address loopback route 1062 * deletion is unconditional. 1063 */ 1064 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) && 1065 !(target->ia_ifp->if_flags & IFF_LOOPBACK) && 1066 (target->ia_flags & IFA_RTSELF)) { 1067 struct route ia_ro; 1068 int freeit = 0; 1069 1070 bzero(&ia_ro, sizeof(ia_ro)); 1071 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = target->ia_addr; 1072 rtalloc_ign_fib(&ia_ro, 0, 0); 1073 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) && 1074 (ia_ro.ro_rt->rt_ifp == V_loif)) { 1075 RT_LOCK(ia_ro.ro_rt); 1076 if (ia_ro.ro_rt->rt_refcnt <= 1) 1077 freeit = 1; 1078 else if (flags & LLE_STATIC) { 1079 RT_REMREF(ia_ro.ro_rt); 1080 target->ia_flags &= ~IFA_RTSELF; 1081 } 1082 RTFREE_LOCKED(ia_ro.ro_rt); 1083 } 1084 if (freeit && (flags & LLE_STATIC)) { 1085 error = ifa_del_loopback_route((struct ifaddr *)target, 1086 (struct sockaddr *)&target->ia_addr); 1087 if (error == 0) 1088 target->ia_flags &= ~IFA_RTSELF; 1089 } 1090 if ((flags & LLE_STATIC) && 1091 !(target->ia_ifp->if_flags & IFF_NOARP)) 1092 /* remove arp cache */ 1093 arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr); 1094 } 1095 1096 if (rtinitflags(target)) 1097 prefix = target->ia_dstaddr.sin_addr; 1098 else { 1099 prefix = target->ia_addr.sin_addr; 1100 mask = target->ia_sockmask.sin_addr; 1101 prefix.s_addr &= mask.s_addr; 1102 } 1103 1104 if ((target->ia_flags & IFA_ROUTE) == 0) { 1105 rt_addrmsg(RTM_DELETE, &target->ia_ifa, fibnum); 1106 return (0); 1107 } 1108 1109 IN_IFADDR_RLOCK(); 1110 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1111 if (rtinitflags(ia)) 1112 p = ia->ia_dstaddr.sin_addr; 1113 else { 1114 p = ia->ia_addr.sin_addr; 1115 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1116 } 1117 1118 if ((prefix.s_addr != p.s_addr) || 1119 !(ia->ia_ifp->if_flags & IFF_UP)) 1120 continue; 1121 1122 /* 1123 * If we got a matching prefix address, move IFA_ROUTE and 1124 * the route itself to it. Make sure that routing daemons 1125 * get a heads-up. 1126 * 1127 * XXX: a special case for carp(4) interface - this should 1128 * be more generally specified as an interface that 1129 * doesn't support such action. 1130 */ 1131 if ((ia->ia_flags & IFA_ROUTE) == 0 1132 && (ia->ia_ifp->if_type != IFT_CARP)) { 1133 ifa_ref(&ia->ia_ifa); 1134 IN_IFADDR_RUNLOCK(); 1135 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, 1136 rtinitflags(target)); 1137 if (error == 0) 1138 target->ia_flags &= ~IFA_ROUTE; 1139 else 1140 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n", 1141 error); 1142 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 1143 rtinitflags(ia) | RTF_UP); 1144 if (error == 0) 1145 ia->ia_flags |= IFA_ROUTE; 1146 else 1147 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n", 1148 error); 1149 ifa_free(&ia->ia_ifa); 1150 return (error); 1151 } 1152 } 1153 IN_IFADDR_RUNLOCK(); 1154 1155 /* 1156 * remove all L2 entries on the given prefix 1157 */ 1158 bzero(&prefix0, sizeof(prefix0)); 1159 prefix0.sin_len = sizeof(prefix0); 1160 prefix0.sin_family = AF_INET; 1161 prefix0.sin_addr.s_addr = target->ia_subnet; 1162 bzero(&mask0, sizeof(mask0)); 1163 mask0.sin_len = sizeof(mask0); 1164 mask0.sin_family = AF_INET; 1165 mask0.sin_addr.s_addr = target->ia_subnetmask; 1166 lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0, 1167 (struct sockaddr *)&mask0, flags); 1168 1169 /* 1170 * As no-one seem to have this prefix, we can remove the route. 1171 */ 1172 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 1173 if (error == 0) 1174 target->ia_flags &= ~IFA_ROUTE; 1175 else 1176 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error); 1177 return (error); 1178} 1179 1180#undef rtinitflags 1181 1182/* 1183 * Return 1 if the address might be a local broadcast address. 1184 */ 1185int 1186in_broadcast(struct in_addr in, struct ifnet *ifp) 1187{ 1188 register struct ifaddr *ifa; 1189 u_long t; 1190 1191 if (in.s_addr == INADDR_BROADCAST || 1192 in.s_addr == INADDR_ANY) 1193 return (1); 1194 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1195 return (0); 1196 t = ntohl(in.s_addr); 1197 /* 1198 * Look through the list of addresses for a match 1199 * with a broadcast address. 1200 */ 1201#define ia ((struct in_ifaddr *)ifa) 1202 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1203 if (ifa->ifa_addr->sa_family == AF_INET && 1204 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1205 /* 1206 * Check for old-style (host 0) broadcast, but 1207 * taking into account that RFC 3021 obsoletes it. 1208 */ 1209 (ia->ia_subnetmask != IN_RFC3021_MASK && 1210 t == ia->ia_subnet)) && 1211 /* 1212 * Check for an all one subnetmask. These 1213 * only exist when an interface gets a secondary 1214 * address. 1215 */ 1216 ia->ia_subnetmask != (u_long)0xffffffff) 1217 return (1); 1218 return (0); 1219#undef ia 1220} 1221 1222/* 1223 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 1224 */ 1225void 1226in_ifdetach(struct ifnet *ifp) 1227{ 1228 1229 in_pcbpurgeif0(&V_ripcbinfo, ifp); 1230 in_pcbpurgeif0(&V_udbinfo, ifp); 1231 in_purgemaddrs(ifp); 1232} 1233 1234/* 1235 * Delete all IPv4 multicast address records, and associated link-layer 1236 * multicast address records, associated with ifp. 1237 * XXX It looks like domifdetach runs AFTER the link layer cleanup. 1238 * XXX This should not race with ifma_protospec being set during 1239 * a new allocation, if it does, we have bigger problems. 1240 */ 1241static void 1242in_purgemaddrs(struct ifnet *ifp) 1243{ 1244 LIST_HEAD(,in_multi) purgeinms; 1245 struct in_multi *inm, *tinm; 1246 struct ifmultiaddr *ifma; 1247 1248 LIST_INIT(&purgeinms); 1249 IN_MULTI_LOCK(); 1250 1251 /* 1252 * Extract list of in_multi associated with the detaching ifp 1253 * which the PF_INET layer is about to release. 1254 * We need to do this as IF_ADDR_LOCK() may be re-acquired 1255 * by code further down. 1256 */ 1257 IF_ADDR_RLOCK(ifp); 1258 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1259 if (ifma->ifma_addr->sa_family != AF_INET || 1260 ifma->ifma_protospec == NULL) 1261 continue; 1262#if 0 1263 KASSERT(ifma->ifma_protospec != NULL, 1264 ("%s: ifma_protospec is NULL", __func__)); 1265#endif 1266 inm = (struct in_multi *)ifma->ifma_protospec; 1267 LIST_INSERT_HEAD(&purgeinms, inm, inm_link); 1268 } 1269 IF_ADDR_RUNLOCK(ifp); 1270 1271 LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) { 1272 LIST_REMOVE(inm, inm_link); 1273 inm_release_locked(inm); 1274 } 1275 igmp_ifdetach(ifp); 1276 1277 IN_MULTI_UNLOCK(); 1278} 1279 1280#include <net/if_dl.h> 1281#include <netinet/if_ether.h> 1282 1283struct in_llentry { 1284 struct llentry base; 1285 struct sockaddr_in l3_addr4; 1286}; 1287 1288/* 1289 * Deletes an address from the address table. 1290 * This function is called by the timer functions 1291 * such as arptimer() and nd6_llinfo_timer(), and 1292 * the caller does the locking. 1293 */ 1294static void 1295in_lltable_free(struct lltable *llt, struct llentry *lle) 1296{ 1297 LLE_WUNLOCK(lle); 1298 LLE_LOCK_DESTROY(lle); 1299 free(lle, M_LLTABLE); 1300} 1301 1302static struct llentry * 1303in_lltable_new(const struct sockaddr *l3addr, u_int flags) 1304{ 1305 struct in_llentry *lle; 1306 1307 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_DONTWAIT | M_ZERO); 1308 if (lle == NULL) /* NB: caller generates msg */ 1309 return NULL; 1310 1311 /* 1312 * For IPv4 this will trigger "arpresolve" to generate 1313 * an ARP request. 1314 */ 1315 lle->base.la_expire = time_uptime; /* mark expired */ 1316 lle->l3_addr4 = *(const struct sockaddr_in *)l3addr; 1317 lle->base.lle_refcnt = 1; 1318 lle->base.lle_free = in_lltable_free; 1319 LLE_LOCK_INIT(&lle->base); 1320 callout_init_rw(&lle->base.la_timer, &lle->base.lle_lock, 1321 CALLOUT_RETURNUNLOCKED); 1322 1323 return (&lle->base); 1324} 1325 1326#define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 1327 (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 ) 1328 1329static void 1330in_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix, 1331 const struct sockaddr *mask, u_int flags) 1332{ 1333 const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix; 1334 const struct sockaddr_in *msk = (const struct sockaddr_in *)mask; 1335 struct llentry *lle, *next; 1336 int i; 1337 size_t pkts_dropped; 1338 1339 IF_AFDATA_WLOCK(llt->llt_ifp); 1340 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1341 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 1342 /* 1343 * (flags & LLE_STATIC) means deleting all entries 1344 * including static ARP entries. 1345 */ 1346 if (IN_ARE_MASKED_ADDR_EQUAL(satosin(L3_ADDR(lle)), 1347 pfx, msk) && ((flags & LLE_STATIC) || 1348 !(lle->la_flags & LLE_STATIC))) { 1349 LLE_WLOCK(lle); 1350 if (callout_stop(&lle->la_timer)) 1351 LLE_REMREF(lle); 1352 pkts_dropped = llentry_free(lle); 1353 ARPSTAT_ADD(dropped, pkts_dropped); 1354 } 1355 } 1356 } 1357 IF_AFDATA_WUNLOCK(llt->llt_ifp); 1358} 1359 1360 1361static int 1362in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr) 1363{ 1364 struct rtentry *rt; 1365 1366 KASSERT(l3addr->sa_family == AF_INET, 1367 ("sin_family %d", l3addr->sa_family)); 1368 1369 /* XXX rtalloc1 should take a const param */ 1370 rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0); 1371 1372 if (rt == NULL) 1373 return (EINVAL); 1374 1375 /* 1376 * If the gateway for an existing host route matches the target L3 1377 * address, which is a special route inserted by some implementation 1378 * such as MANET, and the interface is of the correct type, then 1379 * allow for ARP to proceed. 1380 */ 1381 if (rt->rt_flags & RTF_GATEWAY) { 1382 if (!(rt->rt_flags & RTF_HOST) || !rt->rt_ifp || 1383 rt->rt_ifp->if_type != IFT_ETHER || 1384 (rt->rt_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 || 1385 memcmp(rt->rt_gateway->sa_data, l3addr->sa_data, 1386 sizeof(in_addr_t)) != 0) { 1387 RTFREE_LOCKED(rt); 1388 return (EINVAL); 1389 } 1390 } 1391 1392 /* 1393 * Make sure that at least the destination address is covered 1394 * by the route. This is for handling the case where 2 or more 1395 * interfaces have the same prefix. An incoming packet arrives 1396 * on one interface and the corresponding outgoing packet leaves 1397 * another interface. 1398 */ 1399 if (!(rt->rt_flags & RTF_HOST) && rt->rt_ifp != ifp) { 1400 const char *sa, *mask, *addr, *lim; 1401 int len; 1402 1403 mask = (const char *)rt_mask(rt); 1404 /* 1405 * Just being extra cautious to avoid some custom 1406 * code getting into trouble. 1407 */ 1408 if (mask == NULL) { 1409 RTFREE_LOCKED(rt); 1410 return (EINVAL); 1411 } 1412 1413 sa = (const char *)rt_key(rt); 1414 addr = (const char *)l3addr; 1415 len = ((const struct sockaddr_in *)l3addr)->sin_len; 1416 lim = addr + len; 1417 1418 for ( ; addr < lim; sa++, mask++, addr++) { 1419 if ((*sa ^ *addr) & *mask) { 1420#ifdef DIAGNOSTIC 1421 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n", 1422 inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr)); 1423#endif 1424 RTFREE_LOCKED(rt); 1425 return (EINVAL); 1426 } 1427 } 1428 } 1429 1430 RTFREE_LOCKED(rt); 1431 return (0); 1432} 1433 1434/* 1435 * Return NULL if not found or marked for deletion. 1436 * If found return lle read locked. 1437 */ 1438static struct llentry * 1439in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1440{ 1441 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1442 struct ifnet *ifp = llt->llt_ifp; 1443 struct llentry *lle; 1444 struct llentries *lleh; 1445 u_int hashkey; 1446 1447 IF_AFDATA_LOCK_ASSERT(ifp); 1448 KASSERT(l3addr->sa_family == AF_INET, 1449 ("sin_family %d", l3addr->sa_family)); 1450 1451 hashkey = sin->sin_addr.s_addr; 1452 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 1453 LIST_FOREACH(lle, lleh, lle_next) { 1454 struct sockaddr_in *sa2 = satosin(L3_ADDR(lle)); 1455 if (lle->la_flags & LLE_DELETED) 1456 continue; 1457 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr) 1458 break; 1459 } 1460 if (lle == NULL) { 1461#ifdef DIAGNOSTIC 1462 if (flags & LLE_DELETE) 1463 log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle); 1464#endif 1465 if (!(flags & LLE_CREATE)) 1466 return (NULL); 1467 IF_AFDATA_WLOCK_ASSERT(ifp); 1468 /* 1469 * A route that covers the given address must have 1470 * been installed 1st because we are doing a resolution, 1471 * verify this. 1472 */ 1473 if (!(flags & LLE_IFADDR) && 1474 in_lltable_rtcheck(ifp, flags, l3addr) != 0) 1475 goto done; 1476 1477 lle = in_lltable_new(l3addr, flags); 1478 if (lle == NULL) { 1479 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 1480 goto done; 1481 } 1482 lle->la_flags = flags & ~LLE_CREATE; 1483 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 1484 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 1485 lle->la_flags |= (LLE_VALID | LLE_STATIC); 1486 } 1487 1488 lle->lle_tbl = llt; 1489 lle->lle_head = lleh; 1490 lle->la_flags |= LLE_LINKED; 1491 LIST_INSERT_HEAD(lleh, lle, lle_next); 1492 } else if (flags & LLE_DELETE) { 1493 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 1494 LLE_WLOCK(lle); 1495 lle->la_flags |= LLE_DELETED; 1496 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 1497#ifdef DIAGNOSTIC 1498 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 1499#endif 1500 if ((lle->la_flags & 1501 (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC) 1502 llentry_free(lle); 1503 else 1504 LLE_WUNLOCK(lle); 1505 } 1506 lle = (void *)-1; 1507 1508 } 1509 if (LLE_IS_VALID(lle)) { 1510 if (flags & LLE_EXCLUSIVE) 1511 LLE_WLOCK(lle); 1512 else 1513 LLE_RLOCK(lle); 1514 } 1515done: 1516 return (lle); 1517} 1518 1519static int 1520in_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 1521{ 1522#define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle)) 1523 struct ifnet *ifp = llt->llt_ifp; 1524 struct llentry *lle; 1525 /* XXX stack use */ 1526 struct { 1527 struct rt_msghdr rtm; 1528 struct sockaddr_inarp sin; 1529 struct sockaddr_dl sdl; 1530 } arpc; 1531 int error, i; 1532 1533 LLTABLE_LOCK_ASSERT(); 1534 1535 error = 0; 1536 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1537 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 1538 struct sockaddr_dl *sdl; 1539 1540 /* skip deleted entries */ 1541 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 1542 continue; 1543 /* Skip if jailed and not a valid IP of the prison. */ 1544 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 1545 continue; 1546 /* 1547 * produce a msg made of: 1548 * struct rt_msghdr; 1549 * struct sockaddr_inarp; (IPv4) 1550 * struct sockaddr_dl; 1551 */ 1552 bzero(&arpc, sizeof(arpc)); 1553 arpc.rtm.rtm_msglen = sizeof(arpc); 1554 arpc.rtm.rtm_version = RTM_VERSION; 1555 arpc.rtm.rtm_type = RTM_GET; 1556 arpc.rtm.rtm_flags = RTF_UP; 1557 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1558 arpc.sin.sin_family = AF_INET; 1559 arpc.sin.sin_len = sizeof(arpc.sin); 1560 arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr; 1561 1562 /* publish */ 1563 if (lle->la_flags & LLE_PUB) { 1564 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1565 /* proxy only */ 1566 if (lle->la_flags & LLE_PROXY) 1567 arpc.sin.sin_other = SIN_PROXY; 1568 } 1569 1570 sdl = &arpc.sdl; 1571 sdl->sdl_family = AF_LINK; 1572 sdl->sdl_len = sizeof(*sdl); 1573 sdl->sdl_index = ifp->if_index; 1574 sdl->sdl_type = ifp->if_type; 1575 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 1576 sdl->sdl_alen = ifp->if_addrlen; 1577 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1578 } else { 1579 sdl->sdl_alen = 0; 1580 bzero(LLADDR(sdl), ifp->if_addrlen); 1581 } 1582 1583 arpc.rtm.rtm_rmx.rmx_expire = 1584 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1585 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1586 if (lle->la_flags & LLE_STATIC) 1587 arpc.rtm.rtm_flags |= RTF_STATIC; 1588 arpc.rtm.rtm_index = ifp->if_index; 1589 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1590 if (error) 1591 break; 1592 } 1593 } 1594 return error; 1595#undef SIN 1596} 1597 1598void * 1599in_domifattach(struct ifnet *ifp) 1600{ 1601 struct in_ifinfo *ii; 1602 struct lltable *llt; 1603 1604 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); 1605 1606 llt = lltable_init(ifp, AF_INET); 1607 if (llt != NULL) { 1608 llt->llt_prefix_free = in_lltable_prefix_free; 1609 llt->llt_lookup = in_lltable_lookup; 1610 llt->llt_dump = in_lltable_dump; 1611 } 1612 ii->ii_llt = llt; 1613 1614 ii->ii_igmp = igmp_domifattach(ifp); 1615 1616 return ii; 1617} 1618 1619void 1620in_domifdetach(struct ifnet *ifp, void *aux) 1621{ 1622 struct in_ifinfo *ii = (struct in_ifinfo *)aux; 1623 1624 igmp_domifdetach(ifp); 1625 lltable_free(ii->ii_llt); 1626 free(ii, M_IFADDR); 1627} 1628