Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netinet/in.c
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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: releng/8.2/sys/netinet/in.c 214553 2010-10-30 12:05:20Z 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_dl.h> 53 #include <net/if_llatbl.h> 54 #include <net/if_types.h> 55 #include <net/route.h> 56 #include <net/vnet.h> 57 58 #include <netinet/in.h> 59 #include <netinet/in_var.h> 60 #include <netinet/in_pcb.h> 61 #include <netinet/ip_var.h> 62 #include <netinet/igmp_var.h> 63 #include <netinet/udp.h> 64 #include <netinet/udp_var.h> 65 66 static int in_mask2len(struct in_addr *); 67 static void in_len2mask(struct in_addr *, int); 68 static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, 69 struct ifnet *, struct thread *); 70 71 static int in_addprefix(struct in_ifaddr *, int); 72 static int in_scrubprefix(struct in_ifaddr *); 73 static void in_socktrim(struct sockaddr_in *); 74 static int in_ifinit(struct ifnet *, 75 struct in_ifaddr *, struct sockaddr_in *, int); 76 static void in_purgemaddrs(struct ifnet *); 77 78 static VNET_DEFINE(int, subnetsarelocal); 79 #define V_subnetsarelocal VNET(subnetsarelocal) 80 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 81 &VNET_NAME(subnetsarelocal), 0, 82 "Treat all subnets as directly connected"); 83 static VNET_DEFINE(int, sameprefixcarponly); 84 #define V_sameprefixcarponly VNET(sameprefixcarponly) 85 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, same_prefix_carp_only, CTLFLAG_RW, 86 &VNET_NAME(sameprefixcarponly), 0, 87 "Refuse to create same prefixes on different interfaces"); 88 89 VNET_DECLARE(struct inpcbinfo, ripcbinfo); 90 #define V_ripcbinfo VNET(ripcbinfo) 91 92 /* 93 * Return 1 if an internet address is for a ``local'' host 94 * (one to which we have a connection). If subnetsarelocal 95 * is true, this includes other subnets of the local net. 96 * Otherwise, it includes only the directly-connected (sub)nets. 97 */ 98 int 99 in_localaddr(struct in_addr in) 100 { 101 register u_long i = ntohl(in.s_addr); 102 register struct in_ifaddr *ia; 103 104 IN_IFADDR_RLOCK(); 105 if (V_subnetsarelocal) { 106 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 107 if ((i & ia->ia_netmask) == ia->ia_net) { 108 IN_IFADDR_RUNLOCK(); 109 return (1); 110 } 111 } 112 } else { 113 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 114 if ((i & ia->ia_subnetmask) == ia->ia_subnet) { 115 IN_IFADDR_RUNLOCK(); 116 return (1); 117 } 118 } 119 } 120 IN_IFADDR_RUNLOCK(); 121 return (0); 122 } 123 124 /* 125 * Return 1 if an internet address is for the local host and configured 126 * on one of its interfaces. 127 */ 128 int 129 in_localip(struct in_addr in) 130 { 131 struct in_ifaddr *ia; 132 133 IN_IFADDR_RLOCK(); 134 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { 135 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) { 136 IN_IFADDR_RUNLOCK(); 137 return (1); 138 } 139 } 140 IN_IFADDR_RUNLOCK(); 141 return (0); 142 } 143 144 /* 145 * Determine whether an IP address is in a reserved set of addresses 146 * that may not be forwarded, or whether datagrams to that destination 147 * may be forwarded. 148 */ 149 int 150 in_canforward(struct in_addr in) 151 { 152 register u_long i = ntohl(in.s_addr); 153 register u_long net; 154 155 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i)) 156 return (0); 157 if (IN_CLASSA(i)) { 158 net = i & IN_CLASSA_NET; 159 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 160 return (0); 161 } 162 return (1); 163 } 164 165 /* 166 * Trim a mask in a sockaddr 167 */ 168 static void 169 in_socktrim(struct sockaddr_in *ap) 170 { 171 register char *cplim = (char *) &ap->sin_addr; 172 register char *cp = (char *) (&ap->sin_addr + 1); 173 174 ap->sin_len = 0; 175 while (--cp >= cplim) 176 if (*cp) { 177 (ap)->sin_len = cp - (char *) (ap) + 1; 178 break; 179 } 180 } 181 182 static int 183 in_mask2len(mask) 184 struct in_addr *mask; 185 { 186 int x, y; 187 u_char *p; 188 189 p = (u_char *)mask; 190 for (x = 0; x < sizeof(*mask); x++) { 191 if (p[x] != 0xff) 192 break; 193 } 194 y = 0; 195 if (x < sizeof(*mask)) { 196 for (y = 0; y < 8; y++) { 197 if ((p[x] & (0x80 >> y)) == 0) 198 break; 199 } 200 } 201 return (x * 8 + y); 202 } 203 204 static void 205 in_len2mask(struct in_addr *mask, int len) 206 { 207 int i; 208 u_char *p; 209 210 p = (u_char *)mask; 211 bzero(mask, sizeof(*mask)); 212 for (i = 0; i < len / 8; i++) 213 p[i] = 0xff; 214 if (len % 8) 215 p[i] = (0xff00 >> (len % 8)) & 0xff; 216 } 217 218 /* 219 * Generic internet control operations (ioctl's). 220 * 221 * ifp is NULL if not an interface-specific ioctl. 222 */ 223 /* ARGSUSED */ 224 int 225 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 226 struct thread *td) 227 { 228 register struct ifreq *ifr = (struct ifreq *)data; 229 register struct in_ifaddr *ia, *iap; 230 register struct ifaddr *ifa; 231 struct in_addr allhosts_addr; 232 struct in_addr dst; 233 struct in_ifinfo *ii; 234 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 235 struct sockaddr_in oldaddr; 236 int error, hostIsNew, iaIsNew, maskIsNew; 237 int iaIsFirst; 238 239 ia = NULL; 240 iaIsFirst = 0; 241 iaIsNew = 0; 242 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 243 244 /* 245 * Filter out ioctls we implement directly; forward the rest on to 246 * in_lifaddr_ioctl() and ifp->if_ioctl(). 247 */ 248 switch (cmd) { 249 case SIOCAIFADDR: 250 case SIOCDIFADDR: 251 case SIOCGIFADDR: 252 case SIOCGIFBRDADDR: 253 case SIOCGIFDSTADDR: 254 case SIOCGIFNETMASK: 255 case SIOCSIFADDR: 256 case SIOCSIFBRDADDR: 257 case SIOCSIFDSTADDR: 258 case SIOCSIFNETMASK: 259 break; 260 261 case SIOCALIFADDR: 262 if (td != NULL) { 263 error = priv_check(td, PRIV_NET_ADDIFADDR); 264 if (error) 265 return (error); 266 } 267 if (ifp == NULL) 268 return (EINVAL); 269 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 270 271 case SIOCDLIFADDR: 272 if (td != NULL) { 273 error = priv_check(td, PRIV_NET_DELIFADDR); 274 if (error) 275 return (error); 276 } 277 if (ifp == NULL) 278 return (EINVAL); 279 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 280 281 case SIOCGLIFADDR: 282 if (ifp == NULL) 283 return (EINVAL); 284 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 285 286 default: 287 if (ifp == NULL || ifp->if_ioctl == NULL) 288 return (EOPNOTSUPP); 289 return ((*ifp->if_ioctl)(ifp, cmd, data)); 290 } 291 292 if (ifp == NULL) 293 return (EADDRNOTAVAIL); 294 295 /* 296 * Security checks before we get involved in any work. 297 */ 298 switch (cmd) { 299 case SIOCAIFADDR: 300 case SIOCSIFADDR: 301 case SIOCSIFBRDADDR: 302 case SIOCSIFNETMASK: 303 case SIOCSIFDSTADDR: 304 if (td != NULL) { 305 error = priv_check(td, PRIV_NET_ADDIFADDR); 306 if (error) 307 return (error); 308 } 309 break; 310 311 case SIOCDIFADDR: 312 if (td != NULL) { 313 error = priv_check(td, PRIV_NET_DELIFADDR); 314 if (error) 315 return (error); 316 } 317 break; 318 } 319 320 /* 321 * Find address for this interface, if it exists. 322 * 323 * If an alias address was specified, find that one instead of the 324 * first one on the interface, if possible. 325 */ 326 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 327 IN_IFADDR_RLOCK(); 328 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) { 329 if (iap->ia_ifp == ifp && 330 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 331 if (td == NULL || prison_check_ip4(td->td_ucred, 332 &dst) == 0) 333 ia = iap; 334 break; 335 } 336 } 337 if (ia != NULL) 338 ifa_ref(&ia->ia_ifa); 339 IN_IFADDR_RUNLOCK(); 340 if (ia == NULL) { 341 IF_ADDR_LOCK(ifp); 342 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 343 iap = ifatoia(ifa); 344 if (iap->ia_addr.sin_family == AF_INET) { 345 if (td != NULL && 346 prison_check_ip4(td->td_ucred, 347 &iap->ia_addr.sin_addr) != 0) 348 continue; 349 ia = iap; 350 break; 351 } 352 } 353 if (ia != NULL) 354 ifa_ref(&ia->ia_ifa); 355 IF_ADDR_UNLOCK(ifp); 356 } 357 if (ia == NULL) 358 iaIsFirst = 1; 359 360 error = 0; 361 switch (cmd) { 362 case SIOCAIFADDR: 363 case SIOCDIFADDR: 364 if (ifra->ifra_addr.sin_family == AF_INET) { 365 struct in_ifaddr *oia; 366 367 IN_IFADDR_RLOCK(); 368 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 369 if (ia->ia_ifp == ifp && 370 ia->ia_addr.sin_addr.s_addr == 371 ifra->ifra_addr.sin_addr.s_addr) 372 break; 373 } 374 if (ia != NULL && ia != oia) 375 ifa_ref(&ia->ia_ifa); 376 if (oia != NULL && ia != oia) 377 ifa_free(&oia->ia_ifa); 378 IN_IFADDR_RUNLOCK(); 379 if ((ifp->if_flags & IFF_POINTOPOINT) 380 && (cmd == SIOCAIFADDR) 381 && (ifra->ifra_dstaddr.sin_addr.s_addr 382 == INADDR_ANY)) { 383 error = EDESTADDRREQ; 384 goto out; 385 } 386 } 387 if (cmd == SIOCDIFADDR && ia == NULL) { 388 error = EADDRNOTAVAIL; 389 goto out; 390 } 391 /* FALLTHROUGH */ 392 case SIOCSIFADDR: 393 case SIOCSIFNETMASK: 394 case SIOCSIFDSTADDR: 395 if (ia == NULL) { 396 ia = (struct in_ifaddr *) 397 malloc(sizeof *ia, M_IFADDR, M_NOWAIT | 398 M_ZERO); 399 if (ia == NULL) { 400 error = ENOBUFS; 401 goto out; 402 } 403 404 ifa = &ia->ia_ifa; 405 ifa_init(ifa); 406 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 407 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 408 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 409 410 ia->ia_sockmask.sin_len = 8; 411 ia->ia_sockmask.sin_family = AF_INET; 412 if (ifp->if_flags & IFF_BROADCAST) { 413 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 414 ia->ia_broadaddr.sin_family = AF_INET; 415 } 416 ia->ia_ifp = ifp; 417 418 ifa_ref(ifa); /* if_addrhead */ 419 IF_ADDR_LOCK(ifp); 420 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 421 IF_ADDR_UNLOCK(ifp); 422 ifa_ref(ifa); /* in_ifaddrhead */ 423 IN_IFADDR_WLOCK(); 424 TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link); 425 IN_IFADDR_WUNLOCK(); 426 iaIsNew = 1; 427 } 428 break; 429 430 case SIOCSIFBRDADDR: 431 case SIOCGIFADDR: 432 case SIOCGIFNETMASK: 433 case SIOCGIFDSTADDR: 434 case SIOCGIFBRDADDR: 435 if (ia == NULL) { 436 error = EADDRNOTAVAIL; 437 goto out; 438 } 439 break; 440 } 441 442 /* 443 * Most paths in this switch return directly or via out. Only paths 444 * that remove the address break in order to hit common removal code. 445 */ 446 switch (cmd) { 447 case SIOCGIFADDR: 448 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 449 goto out; 450 451 case SIOCGIFBRDADDR: 452 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 453 error = EINVAL; 454 goto out; 455 } 456 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 457 goto out; 458 459 case SIOCGIFDSTADDR: 460 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 461 error = EINVAL; 462 goto out; 463 } 464 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 465 goto out; 466 467 case SIOCGIFNETMASK: 468 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 469 goto out; 470 471 case SIOCSIFDSTADDR: 472 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 473 error = EINVAL; 474 goto out; 475 } 476 oldaddr = ia->ia_dstaddr; 477 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 478 if (ifp->if_ioctl != NULL) { 479 error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, 480 (caddr_t)ia); 481 if (error) { 482 ia->ia_dstaddr = oldaddr; 483 goto out; 484 } 485 } 486 if (ia->ia_flags & IFA_ROUTE) { 487 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 488 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 489 ia->ia_ifa.ifa_dstaddr = 490 (struct sockaddr *)&ia->ia_dstaddr; 491 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 492 } 493 goto out; 494 495 case SIOCSIFBRDADDR: 496 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 497 error = EINVAL; 498 goto out; 499 } 500 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 501 goto out; 502 503 case SIOCSIFADDR: 504 error = in_ifinit(ifp, ia, 505 (struct sockaddr_in *) &ifr->ifr_addr, 1); 506 if (error != 0 && iaIsNew) 507 break; 508 if (error == 0) { 509 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 510 if (iaIsFirst && 511 (ifp->if_flags & IFF_MULTICAST) != 0) { 512 error = in_joingroup(ifp, &allhosts_addr, 513 NULL, &ii->ii_allhosts); 514 } 515 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 516 } 517 error = 0; 518 goto out; 519 520 case SIOCSIFNETMASK: 521 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 522 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 523 goto out; 524 525 case SIOCAIFADDR: 526 maskIsNew = 0; 527 hostIsNew = 1; 528 error = 0; 529 if (ia->ia_addr.sin_family == AF_INET) { 530 if (ifra->ifra_addr.sin_len == 0) { 531 ifra->ifra_addr = ia->ia_addr; 532 hostIsNew = 0; 533 } else if (ifra->ifra_addr.sin_addr.s_addr == 534 ia->ia_addr.sin_addr.s_addr) 535 hostIsNew = 0; 536 } 537 if (ifra->ifra_mask.sin_len) { 538 /* 539 * QL: XXX 540 * Need to scrub the prefix here in case 541 * the issued command is SIOCAIFADDR with 542 * the same address, but with a different 543 * prefix length. And if the prefix length 544 * is the same as before, then the call is 545 * un-necessarily executed here. 546 */ 547 in_ifscrub(ifp, ia); 548 ia->ia_sockmask = ifra->ifra_mask; 549 ia->ia_sockmask.sin_family = AF_INET; 550 ia->ia_subnetmask = 551 ntohl(ia->ia_sockmask.sin_addr.s_addr); 552 maskIsNew = 1; 553 } 554 if ((ifp->if_flags & IFF_POINTOPOINT) && 555 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 556 in_ifscrub(ifp, ia); 557 ia->ia_dstaddr = ifra->ifra_dstaddr; 558 maskIsNew = 1; /* We lie; but the effect's the same */ 559 } 560 if (ifra->ifra_addr.sin_family == AF_INET && 561 (hostIsNew || maskIsNew)) 562 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 563 if (error != 0 && iaIsNew) 564 goto out; 565 566 if ((ifp->if_flags & IFF_BROADCAST) && 567 (ifra->ifra_broadaddr.sin_family == AF_INET)) 568 ia->ia_broadaddr = ifra->ifra_broadaddr; 569 if (error == 0) { 570 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 571 if (iaIsFirst && 572 (ifp->if_flags & IFF_MULTICAST) != 0) { 573 error = in_joingroup(ifp, &allhosts_addr, 574 NULL, &ii->ii_allhosts); 575 } 576 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 577 } 578 goto out; 579 580 case SIOCDIFADDR: 581 /* 582 * in_ifscrub kills the interface route. 583 */ 584 in_ifscrub(ifp, ia); 585 586 /* 587 * in_ifadown gets rid of all the rest of 588 * the routes. This is not quite the right 589 * thing to do, but at least if we are running 590 * a routing process they will come back. 591 */ 592 in_ifadown(&ia->ia_ifa, 1); 593 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 594 error = 0; 595 break; 596 597 default: 598 panic("in_control: unsupported ioctl"); 599 } 600 601 IF_ADDR_LOCK(ifp); 602 /* Re-check that ia is still part of the list. */ 603 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 604 if (ifa == &ia->ia_ifa) 605 break; 606 } 607 if (ifa == NULL) { 608 /* 609 * If we lost the race with another thread, there is no need to 610 * try it again for the next loop as there is no other exit 611 * path between here and out. 612 */ 613 IF_ADDR_UNLOCK(ifp); 614 error = EADDRNOTAVAIL; 615 goto out; 616 } 617 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 618 IF_ADDR_UNLOCK(ifp); 619 ifa_free(&ia->ia_ifa); /* if_addrhead */ 620 621 IN_IFADDR_WLOCK(); 622 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link); 623 if (ia->ia_addr.sin_family == AF_INET) { 624 struct in_ifaddr *if_ia; 625 626 LIST_REMOVE(ia, ia_hash); 627 IN_IFADDR_WUNLOCK(); 628 /* 629 * If this is the last IPv4 address configured on this 630 * interface, leave the all-hosts group. 631 * No state-change report need be transmitted. 632 */ 633 if_ia = NULL; 634 IFP_TO_IA(ifp, if_ia); 635 if (if_ia == NULL) { 636 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 637 IN_MULTI_LOCK(); 638 if (ii->ii_allhosts) { 639 (void)in_leavegroup_locked(ii->ii_allhosts, 640 NULL); 641 ii->ii_allhosts = NULL; 642 } 643 IN_MULTI_UNLOCK(); 644 } else 645 ifa_free(&if_ia->ia_ifa); 646 } else 647 IN_IFADDR_WUNLOCK(); 648 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 649 out: 650 if (ia != NULL) 651 ifa_free(&ia->ia_ifa); 652 return (error); 653 } 654 655 /* 656 * SIOC[GAD]LIFADDR. 657 * SIOCGLIFADDR: get first address. (?!?) 658 * SIOCGLIFADDR with IFLR_PREFIX: 659 * get first address that matches the specified prefix. 660 * SIOCALIFADDR: add the specified address. 661 * SIOCALIFADDR with IFLR_PREFIX: 662 * EINVAL since we can't deduce hostid part of the address. 663 * SIOCDLIFADDR: delete the specified address. 664 * SIOCDLIFADDR with IFLR_PREFIX: 665 * delete the first address that matches the specified prefix. 666 * return values: 667 * EINVAL on invalid parameters 668 * EADDRNOTAVAIL on prefix match failed/specified address not found 669 * other values may be returned from in_ioctl() 670 */ 671 static int 672 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 673 struct ifnet *ifp, struct thread *td) 674 { 675 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 676 struct ifaddr *ifa; 677 678 /* sanity checks */ 679 if (data == NULL || ifp == NULL) { 680 panic("invalid argument to in_lifaddr_ioctl"); 681 /*NOTRECHED*/ 682 } 683 684 switch (cmd) { 685 case SIOCGLIFADDR: 686 /* address must be specified on GET with IFLR_PREFIX */ 687 if ((iflr->flags & IFLR_PREFIX) == 0) 688 break; 689 /*FALLTHROUGH*/ 690 case SIOCALIFADDR: 691 case SIOCDLIFADDR: 692 /* address must be specified on ADD and DELETE */ 693 if (iflr->addr.ss_family != AF_INET) 694 return (EINVAL); 695 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 696 return (EINVAL); 697 /* XXX need improvement */ 698 if (iflr->dstaddr.ss_family 699 && iflr->dstaddr.ss_family != AF_INET) 700 return (EINVAL); 701 if (iflr->dstaddr.ss_family 702 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 703 return (EINVAL); 704 break; 705 default: /*shouldn't happen*/ 706 return (EOPNOTSUPP); 707 } 708 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 709 return (EINVAL); 710 711 switch (cmd) { 712 case SIOCALIFADDR: 713 { 714 struct in_aliasreq ifra; 715 716 if (iflr->flags & IFLR_PREFIX) 717 return (EINVAL); 718 719 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 720 bzero(&ifra, sizeof(ifra)); 721 bcopy(iflr->iflr_name, ifra.ifra_name, 722 sizeof(ifra.ifra_name)); 723 724 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 725 726 if (iflr->dstaddr.ss_family) { /*XXX*/ 727 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 728 iflr->dstaddr.ss_len); 729 } 730 731 ifra.ifra_mask.sin_family = AF_INET; 732 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 733 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 734 735 return (in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td)); 736 } 737 case SIOCGLIFADDR: 738 case SIOCDLIFADDR: 739 { 740 struct in_ifaddr *ia; 741 struct in_addr mask, candidate, match; 742 struct sockaddr_in *sin; 743 744 bzero(&mask, sizeof(mask)); 745 bzero(&match, sizeof(match)); 746 if (iflr->flags & IFLR_PREFIX) { 747 /* lookup a prefix rather than address. */ 748 in_len2mask(&mask, iflr->prefixlen); 749 750 sin = (struct sockaddr_in *)&iflr->addr; 751 match.s_addr = sin->sin_addr.s_addr; 752 match.s_addr &= mask.s_addr; 753 754 /* if you set extra bits, that's wrong */ 755 if (match.s_addr != sin->sin_addr.s_addr) 756 return (EINVAL); 757 758 } else { 759 /* on getting an address, take the 1st match */ 760 /* on deleting an address, do exact match */ 761 if (cmd != SIOCGLIFADDR) { 762 in_len2mask(&mask, 32); 763 sin = (struct sockaddr_in *)&iflr->addr; 764 match.s_addr = sin->sin_addr.s_addr; 765 } 766 } 767 768 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 769 if (ifa->ifa_addr->sa_family != AF_INET6) 770 continue; 771 if (match.s_addr == 0) 772 break; 773 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 774 candidate.s_addr &= mask.s_addr; 775 if (candidate.s_addr == match.s_addr) 776 break; 777 } 778 if (ifa == NULL) 779 return (EADDRNOTAVAIL); 780 ia = (struct in_ifaddr *)ifa; 781 782 if (cmd == SIOCGLIFADDR) { 783 /* fill in the if_laddrreq structure */ 784 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 785 786 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 787 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 788 ia->ia_dstaddr.sin_len); 789 } else 790 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 791 792 iflr->prefixlen = 793 in_mask2len(&ia->ia_sockmask.sin_addr); 794 795 iflr->flags = 0; /*XXX*/ 796 797 return (0); 798 } else { 799 struct in_aliasreq ifra; 800 801 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 802 bzero(&ifra, sizeof(ifra)); 803 bcopy(iflr->iflr_name, ifra.ifra_name, 804 sizeof(ifra.ifra_name)); 805 806 bcopy(&ia->ia_addr, &ifra.ifra_addr, 807 ia->ia_addr.sin_len); 808 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 809 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 810 ia->ia_dstaddr.sin_len); 811 } 812 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 813 ia->ia_sockmask.sin_len); 814 815 return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 816 ifp, td)); 817 } 818 } 819 } 820 821 return (EOPNOTSUPP); /*just for safety*/ 822 } 823 824 /* 825 * Delete any existing route for an interface. 826 */ 827 void 828 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia) 829 { 830 831 in_scrubprefix(ia); 832 } 833 834 /* 835 * Initialize an interface's internet address 836 * and routing table entry. 837 */ 838 static int 839 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, 840 int scrub) 841 { 842 register u_long i = ntohl(sin->sin_addr.s_addr); 843 struct sockaddr_in oldaddr; 844 int s = splimp(), flags = RTF_UP, error = 0; 845 846 oldaddr = ia->ia_addr; 847 if (oldaddr.sin_family == AF_INET) 848 LIST_REMOVE(ia, ia_hash); 849 ia->ia_addr = *sin; 850 if (ia->ia_addr.sin_family == AF_INET) { 851 IN_IFADDR_WLOCK(); 852 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 853 ia, ia_hash); 854 IN_IFADDR_WUNLOCK(); 855 } 856 /* 857 * Give the interface a chance to initialize 858 * if this is its first address, 859 * and to validate the address if necessary. 860 */ 861 if (ifp->if_ioctl != NULL) { 862 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 863 if (error) { 864 splx(s); 865 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 866 ia->ia_addr = oldaddr; 867 IN_IFADDR_WLOCK(); 868 if (ia->ia_addr.sin_family == AF_INET) 869 LIST_INSERT_HEAD(INADDR_HASH( 870 ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 871 else 872 /* 873 * If oldaddr family is not AF_INET (e.g. 874 * interface has been just created) in_control 875 * does not call LIST_REMOVE, and we end up 876 * with bogus ia entries in hash 877 */ 878 LIST_REMOVE(ia, ia_hash); 879 IN_IFADDR_WUNLOCK(); 880 return (error); 881 } 882 } 883 splx(s); 884 if (scrub) { 885 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 886 in_ifscrub(ifp, ia); 887 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 888 } 889 if (IN_CLASSA(i)) 890 ia->ia_netmask = IN_CLASSA_NET; 891 else if (IN_CLASSB(i)) 892 ia->ia_netmask = IN_CLASSB_NET; 893 else 894 ia->ia_netmask = IN_CLASSC_NET; 895 /* 896 * The subnet mask usually includes at least the standard network part, 897 * but may may be smaller in the case of supernetting. 898 * If it is set, we believe it. 899 */ 900 if (ia->ia_subnetmask == 0) { 901 ia->ia_subnetmask = ia->ia_netmask; 902 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 903 } else 904 ia->ia_netmask &= ia->ia_subnetmask; 905 ia->ia_net = i & ia->ia_netmask; 906 ia->ia_subnet = i & ia->ia_subnetmask; 907 in_socktrim(&ia->ia_sockmask); 908 /* 909 * XXX: carp(4) does not have interface route 910 */ 911 if (ifp->if_type == IFT_CARP) 912 return (0); 913 /* 914 * Add route for the network. 915 */ 916 ia->ia_ifa.ifa_metric = ifp->if_metric; 917 if (ifp->if_flags & IFF_BROADCAST) { 918 ia->ia_broadaddr.sin_addr.s_addr = 919 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 920 ia->ia_netbroadcast.s_addr = 921 htonl(ia->ia_net | ~ ia->ia_netmask); 922 } else if (ifp->if_flags & IFF_LOOPBACK) { 923 ia->ia_dstaddr = ia->ia_addr; 924 flags |= RTF_HOST; 925 } else if (ifp->if_flags & IFF_POINTOPOINT) { 926 if (ia->ia_dstaddr.sin_family != AF_INET) 927 return (0); 928 flags |= RTF_HOST; 929 } 930 if ((error = in_addprefix(ia, flags)) != 0) 931 return (error); 932 933 if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY) 934 return (0); 935 936 if (ifp->if_flags & IFF_POINTOPOINT) { 937 if (ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 938 return (0); 939 } 940 941 942 /* 943 * add a loopback route to self 944 */ 945 if (V_useloopback && !(ifp->if_flags & IFF_LOOPBACK)) { 946 struct route ia_ro; 947 948 bzero(&ia_ro, sizeof(ia_ro)); 949 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = ia->ia_addr; 950 rtalloc_ign_fib(&ia_ro, 0, 0); 951 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) && 952 (ia_ro.ro_rt->rt_ifp == V_loif)) { 953 RT_LOCK(ia_ro.ro_rt); 954 RT_ADDREF(ia_ro.ro_rt); 955 RTFREE_LOCKED(ia_ro.ro_rt); 956 } else 957 error = ifa_add_loopback_route((struct ifaddr *)ia, 958 (struct sockaddr *)&ia->ia_addr); 959 if (error == 0) 960 ia->ia_flags |= IFA_RTSELF; 961 if (ia_ro.ro_rt != NULL) 962 RTFREE(ia_ro.ro_rt); 963 } 964 965 return (error); 966 } 967 968 #define rtinitflags(x) \ 969 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 970 ? RTF_HOST : 0) 971 972 /* 973 * Generate a routing message when inserting or deleting 974 * an interface address alias. 975 */ 976 static void in_addralias_rtmsg(int cmd, struct in_addr *prefix, 977 struct in_ifaddr *target) 978 { 979 struct route pfx_ro; 980 struct sockaddr_in *pfx_addr; 981 struct rtentry msg_rt; 982 983 /* QL: XXX 984 * This is a bit questionable because there is no 985 * additional route entry added/deleted for an address 986 * alias. Therefore this route report is inaccurate. 987 */ 988 bzero(&pfx_ro, sizeof(pfx_ro)); 989 pfx_addr = (struct sockaddr_in *)(&pfx_ro.ro_dst); 990 pfx_addr->sin_len = sizeof(*pfx_addr); 991 pfx_addr->sin_family = AF_INET; 992 pfx_addr->sin_addr = *prefix; 993 rtalloc_ign_fib(&pfx_ro, 0, 0); 994 if (pfx_ro.ro_rt != NULL) { 995 msg_rt = *pfx_ro.ro_rt; 996 997 /* QL: XXX 998 * Point the gateway to the new interface 999 * address as if a new prefix route entry has 1000 * been added through the new address alias. 1001 * All other parts of the rtentry is accurate, 1002 * e.g., rt_key, rt_mask, rt_ifp etc. 1003 */ 1004 msg_rt.rt_gateway = 1005 (struct sockaddr *)&target->ia_addr; 1006 rt_newaddrmsg(cmd, 1007 (struct ifaddr *)target, 1008 0, &msg_rt); 1009 RTFREE(pfx_ro.ro_rt); 1010 } 1011 return; 1012 } 1013 1014 /* 1015 * Check if we have a route for the given prefix already or add one accordingly. 1016 */ 1017 static int 1018 in_addprefix(struct in_ifaddr *target, int flags) 1019 { 1020 struct in_ifaddr *ia; 1021 struct in_addr prefix, mask, p, m; 1022 int error; 1023 1024 if ((flags & RTF_HOST) != 0) { 1025 prefix = target->ia_dstaddr.sin_addr; 1026 mask.s_addr = 0; 1027 } else { 1028 prefix = target->ia_addr.sin_addr; 1029 mask = target->ia_sockmask.sin_addr; 1030 prefix.s_addr &= mask.s_addr; 1031 } 1032 1033 IN_IFADDR_RLOCK(); 1034 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1035 if (rtinitflags(ia)) { 1036 p = ia->ia_addr.sin_addr; 1037 1038 if (prefix.s_addr != p.s_addr) 1039 continue; 1040 } else { 1041 p = ia->ia_addr.sin_addr; 1042 m = ia->ia_sockmask.sin_addr; 1043 p.s_addr &= m.s_addr; 1044 1045 if (prefix.s_addr != p.s_addr || 1046 mask.s_addr != m.s_addr) 1047 continue; 1048 } 1049 1050 /* 1051 * If we got a matching prefix route inserted by other 1052 * interface address, we are done here. 1053 */ 1054 if (ia->ia_flags & IFA_ROUTE) { 1055 #ifdef RADIX_MPATH 1056 if (ia->ia_addr.sin_addr.s_addr == 1057 target->ia_addr.sin_addr.s_addr) { 1058 IN_IFADDR_RUNLOCK(); 1059 return (EEXIST); 1060 } else 1061 break; 1062 #endif 1063 if (V_sameprefixcarponly && 1064 target->ia_ifp->if_type != IFT_CARP && 1065 ia->ia_ifp->if_type != IFT_CARP) { 1066 IN_IFADDR_RUNLOCK(); 1067 return (EEXIST); 1068 } else { 1069 in_addralias_rtmsg(RTM_ADD, &prefix, target); 1070 IN_IFADDR_RUNLOCK(); 1071 return (0); 1072 } 1073 } 1074 } 1075 IN_IFADDR_RUNLOCK(); 1076 1077 /* 1078 * No-one seem to have this prefix route, so we try to insert it. 1079 */ 1080 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 1081 if (!error) 1082 target->ia_flags |= IFA_ROUTE; 1083 return (error); 1084 } 1085 1086 extern void arp_ifscrub(struct ifnet *ifp, uint32_t addr); 1087 1088 /* 1089 * If there is no other address in the system that can serve a route to the 1090 * same prefix, remove the route. Hand over the route to the new address 1091 * otherwise. 1092 */ 1093 static int 1094 in_scrubprefix(struct in_ifaddr *target) 1095 { 1096 struct in_ifaddr *ia; 1097 struct in_addr prefix, mask, p; 1098 int error = 0; 1099 struct sockaddr_in prefix0, mask0; 1100 1101 /* 1102 * Remove the loopback route to the interface address. 1103 * The "useloopback" setting is not consulted because if the 1104 * user configures an interface address, turns off this 1105 * setting, and then tries to delete that interface address, 1106 * checking the current setting of "useloopback" would leave 1107 * that interface address loopback route untouched, which 1108 * would be wrong. Therefore the interface address loopback route 1109 * deletion is unconditional. 1110 */ 1111 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) && 1112 !(target->ia_ifp->if_flags & IFF_LOOPBACK) && 1113 (target->ia_flags & IFA_RTSELF)) { 1114 struct route ia_ro; 1115 int freeit = 0; 1116 1117 bzero(&ia_ro, sizeof(ia_ro)); 1118 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = target->ia_addr; 1119 rtalloc_ign_fib(&ia_ro, 0, 0); 1120 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) && 1121 (ia_ro.ro_rt->rt_ifp == V_loif)) { 1122 RT_LOCK(ia_ro.ro_rt); 1123 if (ia_ro.ro_rt->rt_refcnt <= 1) 1124 freeit = 1; 1125 else 1126 RT_REMREF(ia_ro.ro_rt); 1127 RTFREE_LOCKED(ia_ro.ro_rt); 1128 } 1129 if (freeit) 1130 error = ifa_del_loopback_route((struct ifaddr *)target, 1131 (struct sockaddr *)&target->ia_addr); 1132 if (error == 0) 1133 target->ia_flags &= ~IFA_RTSELF; 1134 /* remove arp cache */ 1135 arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr); 1136 } 1137 1138 if (rtinitflags(target)) 1139 prefix = target->ia_dstaddr.sin_addr; 1140 else { 1141 prefix = target->ia_addr.sin_addr; 1142 mask = target->ia_sockmask.sin_addr; 1143 prefix.s_addr &= mask.s_addr; 1144 } 1145 1146 if ((target->ia_flags & IFA_ROUTE) == 0) { 1147 in_addralias_rtmsg(RTM_DELETE, &prefix, target); 1148 return (0); 1149 } 1150 1151 IN_IFADDR_RLOCK(); 1152 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1153 if (rtinitflags(ia)) 1154 p = ia->ia_dstaddr.sin_addr; 1155 else { 1156 p = ia->ia_addr.sin_addr; 1157 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1158 } 1159 1160 if (prefix.s_addr != p.s_addr) 1161 continue; 1162 1163 /* 1164 * If we got a matching prefix address, move IFA_ROUTE and 1165 * the route itself to it. Make sure that routing daemons 1166 * get a heads-up. 1167 * 1168 * XXX: a special case for carp(4) interface - this should 1169 * be more generally specified as an interface that 1170 * doesn't support such action. 1171 */ 1172 if ((ia->ia_flags & IFA_ROUTE) == 0 1173 && (ia->ia_ifp->if_type != IFT_CARP) 1174 ) { 1175 IN_IFADDR_RUNLOCK(); 1176 rtinit(&(target->ia_ifa), (int)RTM_DELETE, 1177 rtinitflags(target)); 1178 target->ia_flags &= ~IFA_ROUTE; 1179 1180 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 1181 rtinitflags(ia) | RTF_UP); 1182 if (error == 0) 1183 ia->ia_flags |= IFA_ROUTE; 1184 return (error); 1185 } 1186 } 1187 IN_IFADDR_RUNLOCK(); 1188 1189 /* 1190 * remove all L2 entries on the given prefix 1191 */ 1192 bzero(&prefix0, sizeof(prefix0)); 1193 prefix0.sin_len = sizeof(prefix0); 1194 prefix0.sin_family = AF_INET; 1195 prefix0.sin_addr.s_addr = target->ia_subnet; 1196 bzero(&mask0, sizeof(mask0)); 1197 mask0.sin_len = sizeof(mask0); 1198 mask0.sin_family = AF_INET; 1199 mask0.sin_addr.s_addr = target->ia_subnetmask; 1200 lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0, 1201 (struct sockaddr *)&mask0); 1202 1203 /* 1204 * As no-one seem to have this prefix, we can remove the route. 1205 */ 1206 rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 1207 target->ia_flags &= ~IFA_ROUTE; 1208 return (0); 1209 } 1210 1211 #undef rtinitflags 1212 1213 /* 1214 * Return 1 if the address might be a local broadcast address. 1215 */ 1216 int 1217 in_broadcast(struct in_addr in, struct ifnet *ifp) 1218 { 1219 register struct ifaddr *ifa; 1220 u_long t; 1221 1222 if (in.s_addr == INADDR_BROADCAST || 1223 in.s_addr == INADDR_ANY) 1224 return (1); 1225 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1226 return (0); 1227 t = ntohl(in.s_addr); 1228 /* 1229 * Look through the list of addresses for a match 1230 * with a broadcast address. 1231 */ 1232 #define ia ((struct in_ifaddr *)ifa) 1233 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1234 if (ifa->ifa_addr->sa_family == AF_INET && 1235 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1236 in.s_addr == ia->ia_netbroadcast.s_addr || 1237 /* 1238 * Check for old-style (host 0) broadcast. 1239 */ 1240 t == ia->ia_subnet || t == ia->ia_net) && 1241 /* 1242 * Check for an all one subnetmask. These 1243 * only exist when an interface gets a secondary 1244 * address. 1245 */ 1246 ia->ia_subnetmask != (u_long)0xffffffff) 1247 return (1); 1248 return (0); 1249 #undef ia 1250 } 1251 1252 /* 1253 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 1254 */ 1255 void 1256 in_ifdetach(struct ifnet *ifp) 1257 { 1258 1259 in_pcbpurgeif0(&V_ripcbinfo, ifp); 1260 in_pcbpurgeif0(&V_udbinfo, ifp); 1261 in_purgemaddrs(ifp); 1262 } 1263 1264 /* 1265 * Delete all IPv4 multicast address records, and associated link-layer 1266 * multicast address records, associated with ifp. 1267 * XXX It looks like domifdetach runs AFTER the link layer cleanup. 1268 * XXX This should not race with ifma_protospec being set during 1269 * a new allocation, if it does, we have bigger problems. 1270 */ 1271 static void 1272 in_purgemaddrs(struct ifnet *ifp) 1273 { 1274 LIST_HEAD(,in_multi) purgeinms; 1275 struct in_multi *inm, *tinm; 1276 struct ifmultiaddr *ifma; 1277 1278 LIST_INIT(&purgeinms); 1279 IN_MULTI_LOCK(); 1280 1281 /* 1282 * Extract list of in_multi associated with the detaching ifp 1283 * which the PF_INET layer is about to release. 1284 * We need to do this as IF_ADDR_LOCK() may be re-acquired 1285 * by code further down. 1286 */ 1287 IF_ADDR_LOCK(ifp); 1288 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1289 if (ifma->ifma_addr->sa_family != AF_INET || 1290 ifma->ifma_protospec == NULL) 1291 continue; 1292 #if 0 1293 KASSERT(ifma->ifma_protospec != NULL, 1294 ("%s: ifma_protospec is NULL", __func__)); 1295 #endif 1296 inm = (struct in_multi *)ifma->ifma_protospec; 1297 LIST_INSERT_HEAD(&purgeinms, inm, inm_link); 1298 } 1299 IF_ADDR_UNLOCK(ifp); 1300 1301 LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) { 1302 LIST_REMOVE(inm, inm_link); 1303 inm_release_locked(inm); 1304 } 1305 igmp_ifdetach(ifp); 1306 1307 IN_MULTI_UNLOCK(); 1308 } 1309 1310 #include <net/if_dl.h> 1311 #include <netinet/if_ether.h> 1312 1313 struct in_llentry { 1314 struct llentry base; 1315 struct sockaddr_in l3_addr4; 1316 }; 1317 1318 static struct llentry * 1319 in_lltable_new(const struct sockaddr *l3addr, u_int flags) 1320 { 1321 struct in_llentry *lle; 1322 1323 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_DONTWAIT | M_ZERO); 1324 if (lle == NULL) /* NB: caller generates msg */ 1325 return NULL; 1326 1327 callout_init(&lle->base.la_timer, CALLOUT_MPSAFE); 1328 /* 1329 * For IPv4 this will trigger "arpresolve" to generate 1330 * an ARP request. 1331 */ 1332 lle->base.la_expire = time_second; /* mark expired */ 1333 lle->l3_addr4 = *(const struct sockaddr_in *)l3addr; 1334 lle->base.lle_refcnt = 1; 1335 LLE_LOCK_INIT(&lle->base); 1336 return &lle->base; 1337 } 1338 1339 /* 1340 * Deletes an address from the address table. 1341 * This function is called by the timer functions 1342 * such as arptimer() and nd6_llinfo_timer(), and 1343 * the caller does the locking. 1344 */ 1345 static void 1346 in_lltable_free(struct lltable *llt, struct llentry *lle) 1347 { 1348 LLE_WUNLOCK(lle); 1349 LLE_LOCK_DESTROY(lle); 1350 free(lle, M_LLTABLE); 1351 } 1352 1353 1354 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 1355 (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 ) 1356 1357 static void 1358 in_lltable_prefix_free(struct lltable *llt, 1359 const struct sockaddr *prefix, 1360 const struct sockaddr *mask) 1361 { 1362 const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix; 1363 const struct sockaddr_in *msk = (const struct sockaddr_in *)mask; 1364 struct llentry *lle, *next; 1365 register int i; 1366 1367 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) { 1368 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 1369 1370 if (IN_ARE_MASKED_ADDR_EQUAL((struct sockaddr_in *)L3_ADDR(lle), 1371 pfx, msk)) { 1372 int canceled; 1373 1374 canceled = callout_drain(&lle->la_timer); 1375 LLE_WLOCK(lle); 1376 if (canceled) 1377 LLE_REMREF(lle); 1378 llentry_free(lle); 1379 } 1380 } 1381 } 1382 } 1383 1384 1385 static int 1386 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr) 1387 { 1388 struct rtentry *rt; 1389 1390 KASSERT(l3addr->sa_family == AF_INET, 1391 ("sin_family %d", l3addr->sa_family)); 1392 1393 /* XXX rtalloc1 should take a const param */ 1394 rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0); 1395 if (rt == NULL || (!(flags & LLE_PUB) && 1396 ((rt->rt_flags & RTF_GATEWAY) || 1397 (rt->rt_ifp != ifp)))) { 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 if (rt != NULL) 1403 RTFREE_LOCKED(rt); 1404 return (EINVAL); 1405 } 1406 RTFREE_LOCKED(rt); 1407 return 0; 1408 } 1409 1410 /* 1411 * Return NULL if not found or marked for deletion. 1412 * If found return lle read locked. 1413 */ 1414 static struct llentry * 1415 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1416 { 1417 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1418 struct ifnet *ifp = llt->llt_ifp; 1419 struct llentry *lle; 1420 struct llentries *lleh; 1421 u_int hashkey; 1422 1423 IF_AFDATA_LOCK_ASSERT(ifp); 1424 KASSERT(l3addr->sa_family == AF_INET, 1425 ("sin_family %d", l3addr->sa_family)); 1426 1427 hashkey = sin->sin_addr.s_addr; 1428 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 1429 LIST_FOREACH(lle, lleh, lle_next) { 1430 struct sockaddr_in *sa2 = (struct sockaddr_in *)L3_ADDR(lle); 1431 if (lle->la_flags & LLE_DELETED) 1432 continue; 1433 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr) 1434 break; 1435 } 1436 if (lle == NULL) { 1437 #ifdef DIAGNOSTIC 1438 if (flags & LLE_DELETE) 1439 log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle); 1440 #endif 1441 if (!(flags & LLE_CREATE)) 1442 return (NULL); 1443 /* 1444 * A route that covers the given address must have 1445 * been installed 1st because we are doing a resolution, 1446 * verify this. 1447 */ 1448 if (!(flags & LLE_IFADDR) && 1449 in_lltable_rtcheck(ifp, flags, l3addr) != 0) 1450 goto done; 1451 1452 lle = in_lltable_new(l3addr, flags); 1453 if (lle == NULL) { 1454 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 1455 goto done; 1456 } 1457 lle->la_flags = flags & ~LLE_CREATE; 1458 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 1459 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 1460 lle->la_flags |= (LLE_VALID | LLE_STATIC); 1461 } 1462 1463 lle->lle_tbl = llt; 1464 lle->lle_head = lleh; 1465 LIST_INSERT_HEAD(lleh, lle, lle_next); 1466 } else if (flags & LLE_DELETE) { 1467 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 1468 LLE_WLOCK(lle); 1469 lle->la_flags = LLE_DELETED; 1470 LLE_WUNLOCK(lle); 1471 #ifdef DIAGNOSTIC 1472 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 1473 #endif 1474 } 1475 lle = (void *)-1; 1476 1477 } 1478 if (LLE_IS_VALID(lle)) { 1479 if (flags & LLE_EXCLUSIVE) 1480 LLE_WLOCK(lle); 1481 else 1482 LLE_RLOCK(lle); 1483 } 1484 done: 1485 return (lle); 1486 } 1487 1488 static int 1489 in_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 1490 { 1491 #define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle)) 1492 struct ifnet *ifp = llt->llt_ifp; 1493 struct llentry *lle; 1494 /* XXX stack use */ 1495 struct { 1496 struct rt_msghdr rtm; 1497 struct sockaddr_inarp sin; 1498 struct sockaddr_dl sdl; 1499 } arpc; 1500 int error, i; 1501 1502 LLTABLE_LOCK_ASSERT(); 1503 1504 error = 0; 1505 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1506 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 1507 struct sockaddr_dl *sdl; 1508 1509 /* skip deleted entries */ 1510 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 1511 continue; 1512 /* Skip if jailed and not a valid IP of the prison. */ 1513 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 1514 continue; 1515 /* 1516 * produce a msg made of: 1517 * struct rt_msghdr; 1518 * struct sockaddr_inarp; (IPv4) 1519 * struct sockaddr_dl; 1520 */ 1521 bzero(&arpc, sizeof(arpc)); 1522 arpc.rtm.rtm_msglen = sizeof(arpc); 1523 arpc.rtm.rtm_version = RTM_VERSION; 1524 arpc.rtm.rtm_type = RTM_GET; 1525 arpc.rtm.rtm_flags = RTF_UP; 1526 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1527 arpc.sin.sin_family = AF_INET; 1528 arpc.sin.sin_len = sizeof(arpc.sin); 1529 arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr; 1530 1531 /* publish */ 1532 if (lle->la_flags & LLE_PUB) { 1533 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1534 /* proxy only */ 1535 if (lle->la_flags & LLE_PROXY) 1536 arpc.sin.sin_other = SIN_PROXY; 1537 } 1538 1539 sdl = &arpc.sdl; 1540 sdl->sdl_family = AF_LINK; 1541 sdl->sdl_len = sizeof(*sdl); 1542 sdl->sdl_index = ifp->if_index; 1543 sdl->sdl_type = ifp->if_type; 1544 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 1545 sdl->sdl_alen = ifp->if_addrlen; 1546 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1547 } else { 1548 sdl->sdl_alen = 0; 1549 bzero(LLADDR(sdl), ifp->if_addrlen); 1550 } 1551 1552 arpc.rtm.rtm_rmx.rmx_expire = 1553 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1554 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1555 if (lle->la_flags & LLE_STATIC) 1556 arpc.rtm.rtm_flags |= RTF_STATIC; 1557 arpc.rtm.rtm_index = ifp->if_index; 1558 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1559 if (error) 1560 break; 1561 } 1562 } 1563 return error; 1564 #undef SIN 1565 } 1566 1567 void * 1568 in_domifattach(struct ifnet *ifp) 1569 { 1570 struct in_ifinfo *ii; 1571 struct lltable *llt; 1572 1573 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); 1574 1575 llt = lltable_init(ifp, AF_INET); 1576 if (llt != NULL) { 1577 llt->llt_new = in_lltable_new; 1578 llt->llt_free = in_lltable_free; 1579 llt->llt_prefix_free = in_lltable_prefix_free; 1580 llt->llt_rtcheck = in_lltable_rtcheck; 1581 llt->llt_lookup = in_lltable_lookup; 1582 llt->llt_dump = in_lltable_dump; 1583 } 1584 ii->ii_llt = llt; 1585 1586 ii->ii_igmp = igmp_domifattach(ifp); 1587 1588 return ii; 1589 } 1590 1591 void 1592 in_domifdetach(struct ifnet *ifp, void *aux) 1593 { 1594 struct in_ifinfo *ii = (struct in_ifinfo *)aux; 1595 1596 igmp_domifdetach(ifp); 1597 lltable_free(ii->ii_llt); 1598 free(ii, M_IFADDR); 1599 }
Cache object: d80b0d067f7f35e07692c12bca819d88
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