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 67 static int in_mask2len(struct in_addr *); 68 static void in_len2mask(struct in_addr *, int); 69 static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, 70 struct ifnet *, struct thread *); 71 72 static int in_addprefix(struct in_ifaddr *, int); 73 static int in_scrubprefix(struct in_ifaddr *, u_int); 74 static void in_socktrim(struct sockaddr_in *); 75 static int in_ifinit(struct ifnet *, 76 struct in_ifaddr *, struct sockaddr_in *, int, int); 77 static void in_purgemaddrs(struct ifnet *); 78 79 static VNET_DEFINE(int, sameprefixcarponly); 80 #define V_sameprefixcarponly VNET(sameprefixcarponly) 81 SYSCTL_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 85 VNET_DECLARE(struct inpcbinfo, ripcbinfo); 86 #define V_ripcbinfo VNET(ripcbinfo) 87 88 VNET_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 */ 95 int 96 in_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 */ 116 int 117 in_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 */ 137 int 138 in_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 */ 156 static void 157 in_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 } 169 170 static int 171 in_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 } 191 192 static void 193 in_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 */ 212 int 213 in_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 SIOCGIFADDR: 238 case SIOCGIFBRDADDR: 239 case SIOCGIFDSTADDR: 240 case SIOCGIFNETMASK: 241 case SIOCDIFADDR: 242 break; 243 case SIOCAIFADDR: 244 /* 245 * ifra_addr must be present and be of INET family. 246 * ifra_broadaddr and ifra_mask are optional. 247 */ 248 if (ifra->ifra_addr.sin_len != sizeof(struct sockaddr_in) || 249 ifra->ifra_addr.sin_family != AF_INET) 250 return (EINVAL); 251 if (ifra->ifra_broadaddr.sin_len != 0 && 252 (ifra->ifra_broadaddr.sin_len != 253 sizeof(struct sockaddr_in) || 254 ifra->ifra_broadaddr.sin_family != AF_INET)) 255 return (EINVAL); 256 #if 0 257 /* 258 * ifconfig(8) historically doesn't set af_family for mask 259 * for unknown reason. 260 */ 261 if (ifra->ifra_mask.sin_len != 0 && 262 (ifra->ifra_mask.sin_len != sizeof(struct sockaddr_in) || 263 ifra->ifra_mask.sin_family != AF_INET)) 264 return (EINVAL); 265 #endif 266 break; 267 case SIOCSIFADDR: 268 case SIOCSIFBRDADDR: 269 case SIOCSIFDSTADDR: 270 case SIOCSIFNETMASK: 271 if (ifr->ifr_addr.sa_family != AF_INET || 272 ifr->ifr_addr.sa_len != sizeof(struct sockaddr_in)) 273 return (EINVAL); 274 break; 275 276 case SIOCALIFADDR: 277 if (td != NULL) { 278 error = priv_check(td, PRIV_NET_ADDIFADDR); 279 if (error) 280 return (error); 281 } 282 if (ifp == NULL) 283 return (EINVAL); 284 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 285 286 case SIOCDLIFADDR: 287 if (td != NULL) { 288 error = priv_check(td, PRIV_NET_DELIFADDR); 289 if (error) 290 return (error); 291 } 292 if (ifp == NULL) 293 return (EINVAL); 294 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 295 296 case SIOCGLIFADDR: 297 if (ifp == NULL) 298 return (EINVAL); 299 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 300 301 default: 302 if (ifp == NULL || ifp->if_ioctl == NULL) 303 return (EOPNOTSUPP); 304 return ((*ifp->if_ioctl)(ifp, cmd, data)); 305 } 306 307 if (ifp == NULL) 308 return (EADDRNOTAVAIL); 309 310 /* 311 * Security checks before we get involved in any work. 312 */ 313 switch (cmd) { 314 case SIOCAIFADDR: 315 case SIOCSIFADDR: 316 case SIOCSIFBRDADDR: 317 case SIOCSIFNETMASK: 318 case SIOCSIFDSTADDR: 319 if (td != NULL) { 320 error = priv_check(td, PRIV_NET_ADDIFADDR); 321 if (error) 322 return (error); 323 } 324 break; 325 326 case SIOCDIFADDR: 327 if (td != NULL) { 328 error = priv_check(td, PRIV_NET_DELIFADDR); 329 if (error) 330 return (error); 331 } 332 break; 333 } 334 335 /* 336 * Find address for this interface, if it exists. 337 * 338 * If an alias address was specified, find that one instead of the 339 * first one on the interface, if possible. 340 */ 341 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 342 IN_IFADDR_RLOCK(); 343 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) { 344 if (iap->ia_ifp == ifp && 345 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 346 if (td == NULL || prison_check_ip4(td->td_ucred, 347 &dst) == 0) 348 ia = iap; 349 break; 350 } 351 } 352 if (ia != NULL) 353 ifa_ref(&ia->ia_ifa); 354 IN_IFADDR_RUNLOCK(); 355 if (ia == NULL) { 356 IF_ADDR_LOCK(ifp); 357 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 358 iap = ifatoia(ifa); 359 if (iap->ia_addr.sin_family == AF_INET) { 360 if (td != NULL && 361 prison_check_ip4(td->td_ucred, 362 &iap->ia_addr.sin_addr) != 0) 363 continue; 364 ia = iap; 365 break; 366 } 367 } 368 if (ia != NULL) 369 ifa_ref(&ia->ia_ifa); 370 IF_ADDR_UNLOCK(ifp); 371 } 372 if (ia == NULL) 373 iaIsFirst = 1; 374 375 error = 0; 376 switch (cmd) { 377 case SIOCAIFADDR: 378 case SIOCDIFADDR: 379 if (ifra->ifra_addr.sin_family == AF_INET) { 380 struct in_ifaddr *oia; 381 382 IN_IFADDR_RLOCK(); 383 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 384 if (ia->ia_ifp == ifp && 385 ia->ia_addr.sin_addr.s_addr == 386 ifra->ifra_addr.sin_addr.s_addr) 387 break; 388 } 389 if (ia != NULL && ia != oia) 390 ifa_ref(&ia->ia_ifa); 391 if (oia != NULL && ia != oia) 392 ifa_free(&oia->ia_ifa); 393 IN_IFADDR_RUNLOCK(); 394 if ((ifp->if_flags & IFF_POINTOPOINT) 395 && (cmd == SIOCAIFADDR) 396 && (ifra->ifra_dstaddr.sin_addr.s_addr 397 == INADDR_ANY)) { 398 error = EDESTADDRREQ; 399 goto out; 400 } 401 } 402 if (cmd == SIOCDIFADDR && ia == NULL) { 403 error = EADDRNOTAVAIL; 404 goto out; 405 } 406 /* FALLTHROUGH */ 407 case SIOCSIFADDR: 408 case SIOCSIFNETMASK: 409 case SIOCSIFDSTADDR: 410 if (ia == NULL) { 411 ia = (struct in_ifaddr *) 412 malloc(sizeof *ia, M_IFADDR, M_NOWAIT | 413 M_ZERO); 414 if (ia == NULL) { 415 error = ENOBUFS; 416 goto out; 417 } 418 419 ifa = &ia->ia_ifa; 420 ifa_init(ifa); 421 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 422 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 423 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 424 425 ia->ia_sockmask.sin_len = 8; 426 ia->ia_sockmask.sin_family = AF_INET; 427 if (ifp->if_flags & IFF_BROADCAST) { 428 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 429 ia->ia_broadaddr.sin_family = AF_INET; 430 } 431 ia->ia_ifp = ifp; 432 433 ifa_ref(ifa); /* if_addrhead */ 434 IF_ADDR_LOCK(ifp); 435 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 436 IF_ADDR_UNLOCK(ifp); 437 ifa_ref(ifa); /* in_ifaddrhead */ 438 IN_IFADDR_WLOCK(); 439 TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link); 440 IN_IFADDR_WUNLOCK(); 441 iaIsNew = 1; 442 } 443 break; 444 445 case SIOCSIFBRDADDR: 446 case SIOCGIFADDR: 447 case SIOCGIFNETMASK: 448 case SIOCGIFDSTADDR: 449 case SIOCGIFBRDADDR: 450 if (ia == NULL) { 451 error = EADDRNOTAVAIL; 452 goto out; 453 } 454 break; 455 } 456 457 /* 458 * Most paths in this switch return directly or via out. Only paths 459 * that remove the address break in order to hit common removal code. 460 */ 461 switch (cmd) { 462 case SIOCGIFADDR: 463 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 464 goto out; 465 466 case SIOCGIFBRDADDR: 467 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 468 error = EINVAL; 469 goto out; 470 } 471 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 472 goto out; 473 474 case SIOCGIFDSTADDR: 475 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 476 error = EINVAL; 477 goto out; 478 } 479 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 480 goto out; 481 482 case SIOCGIFNETMASK: 483 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 484 goto out; 485 486 case SIOCSIFDSTADDR: 487 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 488 error = EINVAL; 489 goto out; 490 } 491 oldaddr = ia->ia_dstaddr; 492 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 493 if (ifp->if_ioctl != NULL) { 494 error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, 495 (caddr_t)ia); 496 if (error) { 497 ia->ia_dstaddr = oldaddr; 498 goto out; 499 } 500 } 501 if (ia->ia_flags & IFA_ROUTE) { 502 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 503 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 504 ia->ia_ifa.ifa_dstaddr = 505 (struct sockaddr *)&ia->ia_dstaddr; 506 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 507 } 508 goto out; 509 510 case SIOCSIFBRDADDR: 511 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 512 error = EINVAL; 513 goto out; 514 } 515 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 516 goto out; 517 518 case SIOCSIFADDR: 519 error = in_ifinit(ifp, ia, 520 (struct sockaddr_in *) &ifr->ifr_addr, 1, 0); 521 if (error != 0 && iaIsNew) 522 break; 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 error = 0; 533 goto out; 534 535 case SIOCSIFNETMASK: 536 ia->ia_sockmask.sin_addr = ((struct sockaddr_in *) 537 &ifr->ifr_addr)->sin_addr; 538 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 539 goto out; 540 541 case SIOCAIFADDR: 542 maskIsNew = 0; 543 hostIsNew = 1; 544 error = 0; 545 if (ifra->ifra_addr.sin_addr.s_addr == 546 ia->ia_addr.sin_addr.s_addr) 547 hostIsNew = 0; 548 if (ifra->ifra_mask.sin_len) { 549 /* 550 * QL: XXX 551 * Need to scrub the prefix here in case 552 * the issued command is SIOCAIFADDR with 553 * the same address, but with a different 554 * prefix length. And if the prefix length 555 * is the same as before, then the call is 556 * un-necessarily executed here. 557 */ 558 in_ifscrub(ifp, ia, LLE_STATIC); 559 ia->ia_sockmask = ifra->ifra_mask; 560 ia->ia_sockmask.sin_family = AF_INET; 561 ia->ia_subnetmask = 562 ntohl(ia->ia_sockmask.sin_addr.s_addr); 563 maskIsNew = 1; 564 } 565 if ((ifp->if_flags & IFF_POINTOPOINT) && 566 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 567 in_ifscrub(ifp, ia, LLE_STATIC); 568 ia->ia_dstaddr = ifra->ifra_dstaddr; 569 maskIsNew = 1; /* We lie; but the effect's the same */ 570 } 571 if (hostIsNew || maskIsNew) 572 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0, 573 maskIsNew); 574 if (error != 0 && iaIsNew) 575 break; 576 577 if ((ifp->if_flags & IFF_BROADCAST) && 578 ifra->ifra_broadaddr.sin_len) 579 ia->ia_broadaddr = ifra->ifra_broadaddr; 580 if (error == 0) { 581 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 582 if (iaIsFirst && 583 (ifp->if_flags & IFF_MULTICAST) != 0) { 584 error = in_joingroup(ifp, &allhosts_addr, 585 NULL, &ii->ii_allhosts); 586 } 587 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 588 } 589 goto out; 590 591 case SIOCDIFADDR: 592 /* 593 * in_ifscrub kills the interface route. 594 */ 595 in_ifscrub(ifp, ia, LLE_STATIC); 596 597 /* 598 * in_ifadown gets rid of all the rest of 599 * the routes. This is not quite the right 600 * thing to do, but at least if we are running 601 * a routing process they will come back. 602 */ 603 in_ifadown(&ia->ia_ifa, 1); 604 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 605 error = 0; 606 break; 607 608 default: 609 panic("in_control: unsupported ioctl"); 610 } 611 612 IF_ADDR_LOCK(ifp); 613 /* Re-check that ia is still part of the list. */ 614 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 615 if (ifa == &ia->ia_ifa) 616 break; 617 } 618 if (ifa == NULL) { 619 /* 620 * If we lost the race with another thread, there is no need to 621 * try it again for the next loop as there is no other exit 622 * path between here and out. 623 */ 624 IF_ADDR_UNLOCK(ifp); 625 error = EADDRNOTAVAIL; 626 goto out; 627 } 628 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 629 IF_ADDR_UNLOCK(ifp); 630 ifa_free(&ia->ia_ifa); /* if_addrhead */ 631 632 IN_IFADDR_WLOCK(); 633 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link); 634 635 LIST_REMOVE(ia, ia_hash); 636 IN_IFADDR_WUNLOCK(); 637 /* 638 * If this is the last IPv4 address configured on this 639 * interface, leave the all-hosts group. 640 * No state-change report need be transmitted. 641 */ 642 IFP_TO_IA(ifp, iap); 643 if (iap == NULL) { 644 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 645 IN_MULTI_LOCK(); 646 if (ii->ii_allhosts) { 647 (void)in_leavegroup_locked(ii->ii_allhosts, NULL); 648 ii->ii_allhosts = NULL; 649 } 650 IN_MULTI_UNLOCK(); 651 } else 652 ifa_free(&iap->ia_ifa); 653 654 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 655 out: 656 if (ia != NULL) 657 ifa_free(&ia->ia_ifa); 658 return (error); 659 } 660 661 /* 662 * SIOC[GAD]LIFADDR. 663 * SIOCGLIFADDR: get first address. (?!?) 664 * SIOCGLIFADDR with IFLR_PREFIX: 665 * get first address that matches the specified prefix. 666 * SIOCALIFADDR: add the specified address. 667 * SIOCALIFADDR with IFLR_PREFIX: 668 * EINVAL since we can't deduce hostid part of the address. 669 * SIOCDLIFADDR: delete the specified address. 670 * SIOCDLIFADDR with IFLR_PREFIX: 671 * delete the first address that matches the specified prefix. 672 * return values: 673 * EINVAL on invalid parameters 674 * EADDRNOTAVAIL on prefix match failed/specified address not found 675 * other values may be returned from in_ioctl() 676 */ 677 static int 678 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 679 struct ifnet *ifp, struct thread *td) 680 { 681 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 682 struct ifaddr *ifa; 683 684 /* sanity checks */ 685 if (data == NULL || ifp == NULL) { 686 panic("invalid argument to in_lifaddr_ioctl"); 687 /*NOTRECHED*/ 688 } 689 690 switch (cmd) { 691 case SIOCGLIFADDR: 692 /* address must be specified on GET with IFLR_PREFIX */ 693 if ((iflr->flags & IFLR_PREFIX) == 0) 694 break; 695 /*FALLTHROUGH*/ 696 case SIOCALIFADDR: 697 case SIOCDLIFADDR: 698 /* address must be specified on ADD and DELETE */ 699 if (iflr->addr.ss_family != AF_INET) 700 return (EINVAL); 701 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 702 return (EINVAL); 703 /* XXX need improvement */ 704 if (iflr->dstaddr.ss_family 705 && iflr->dstaddr.ss_family != AF_INET) 706 return (EINVAL); 707 if (iflr->dstaddr.ss_family 708 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 709 return (EINVAL); 710 break; 711 default: /*shouldn't happen*/ 712 return (EOPNOTSUPP); 713 } 714 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 715 return (EINVAL); 716 717 switch (cmd) { 718 case SIOCALIFADDR: 719 { 720 struct in_aliasreq ifra; 721 722 if (iflr->flags & IFLR_PREFIX) 723 return (EINVAL); 724 725 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 726 bzero(&ifra, sizeof(ifra)); 727 bcopy(iflr->iflr_name, ifra.ifra_name, 728 sizeof(ifra.ifra_name)); 729 730 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 731 732 if (iflr->dstaddr.ss_family) { /*XXX*/ 733 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 734 iflr->dstaddr.ss_len); 735 } 736 737 ifra.ifra_mask.sin_family = AF_INET; 738 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 739 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 740 741 return (in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td)); 742 } 743 case SIOCGLIFADDR: 744 case SIOCDLIFADDR: 745 { 746 struct in_ifaddr *ia; 747 struct in_addr mask, candidate, match; 748 struct sockaddr_in *sin; 749 750 bzero(&mask, sizeof(mask)); 751 bzero(&match, sizeof(match)); 752 if (iflr->flags & IFLR_PREFIX) { 753 /* lookup a prefix rather than address. */ 754 in_len2mask(&mask, iflr->prefixlen); 755 756 sin = (struct sockaddr_in *)&iflr->addr; 757 match.s_addr = sin->sin_addr.s_addr; 758 match.s_addr &= mask.s_addr; 759 760 /* if you set extra bits, that's wrong */ 761 if (match.s_addr != sin->sin_addr.s_addr) 762 return (EINVAL); 763 764 } else { 765 /* on getting an address, take the 1st match */ 766 /* on deleting an address, do exact match */ 767 if (cmd != SIOCGLIFADDR) { 768 in_len2mask(&mask, 32); 769 sin = (struct sockaddr_in *)&iflr->addr; 770 match.s_addr = sin->sin_addr.s_addr; 771 } 772 } 773 774 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 775 if (ifa->ifa_addr->sa_family != AF_INET6) 776 continue; 777 if (match.s_addr == 0) 778 break; 779 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 780 candidate.s_addr &= mask.s_addr; 781 if (candidate.s_addr == match.s_addr) 782 break; 783 } 784 if (ifa == NULL) 785 return (EADDRNOTAVAIL); 786 ia = (struct in_ifaddr *)ifa; 787 788 if (cmd == SIOCGLIFADDR) { 789 /* fill in the if_laddrreq structure */ 790 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 791 792 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 793 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 794 ia->ia_dstaddr.sin_len); 795 } else 796 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 797 798 iflr->prefixlen = 799 in_mask2len(&ia->ia_sockmask.sin_addr); 800 801 iflr->flags = 0; /*XXX*/ 802 803 return (0); 804 } else { 805 struct in_aliasreq ifra; 806 807 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 808 bzero(&ifra, sizeof(ifra)); 809 bcopy(iflr->iflr_name, ifra.ifra_name, 810 sizeof(ifra.ifra_name)); 811 812 bcopy(&ia->ia_addr, &ifra.ifra_addr, 813 ia->ia_addr.sin_len); 814 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 815 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 816 ia->ia_dstaddr.sin_len); 817 } 818 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 819 ia->ia_sockmask.sin_len); 820 821 return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 822 ifp, td)); 823 } 824 } 825 } 826 827 return (EOPNOTSUPP); /*just for safety*/ 828 } 829 830 /* 831 * Delete any existing route for an interface. 832 */ 833 void 834 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia, u_int flags) 835 { 836 837 in_scrubprefix(ia, flags); 838 } 839 840 /* 841 * Initialize an interface's internet address 842 * and routing table entry. 843 */ 844 static int 845 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, 846 int scrub, int masksupplied) 847 { 848 register u_long i = ntohl(sin->sin_addr.s_addr); 849 int flags = RTF_UP, error = 0; 850 851 if (scrub) 852 in_scrubprefix(ia, LLE_STATIC); 853 854 IN_IFADDR_WLOCK(); 855 if (ia->ia_addr.sin_family == AF_INET) 856 LIST_REMOVE(ia, ia_hash); 857 ia->ia_addr = *sin; 858 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 859 ia, ia_hash); 860 IN_IFADDR_WUNLOCK(); 861 862 /* 863 * Give the interface a chance to initialize 864 * if this is its first address, 865 * and to validate the address if necessary. 866 */ 867 if (ifp->if_ioctl != NULL && 868 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia)) != 0) 869 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 870 return (error); 871 872 /* 873 * Be compatible with network classes, if netmask isn't supplied, 874 * guess it based on classes. 875 */ 876 if (!masksupplied) { 877 if (IN_CLASSA(i)) 878 ia->ia_subnetmask = IN_CLASSA_NET; 879 else if (IN_CLASSB(i)) 880 ia->ia_subnetmask = IN_CLASSB_NET; 881 else 882 ia->ia_subnetmask = IN_CLASSC_NET; 883 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 884 } 885 ia->ia_subnet = i & ia->ia_subnetmask; 886 in_socktrim(&ia->ia_sockmask); 887 /* 888 * XXX: carp(4) does not have interface route 889 */ 890 if (ifp->if_type == IFT_CARP) 891 return (0); 892 /* 893 * Add route for the network. 894 */ 895 ia->ia_ifa.ifa_metric = ifp->if_metric; 896 if (ifp->if_flags & IFF_BROADCAST) { 897 if (ia->ia_subnetmask == IN_RFC3021_MASK) 898 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST; 899 else 900 ia->ia_broadaddr.sin_addr.s_addr = 901 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 902 } else if (ifp->if_flags & IFF_LOOPBACK) { 903 ia->ia_dstaddr = ia->ia_addr; 904 flags |= RTF_HOST; 905 } else if (ifp->if_flags & IFF_POINTOPOINT) { 906 if (ia->ia_dstaddr.sin_family != AF_INET) 907 return (0); 908 flags |= RTF_HOST; 909 } 910 if ((error = in_addprefix(ia, flags)) != 0) 911 return (error); 912 913 if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY) 914 return (0); 915 916 if (ifp->if_flags & IFF_POINTOPOINT && 917 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 918 return (0); 919 920 /* 921 * add a loopback route to self 922 */ 923 if (V_useloopback && !(ifp->if_flags & IFF_LOOPBACK)) { 924 struct route ia_ro; 925 926 bzero(&ia_ro, sizeof(ia_ro)); 927 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = ia->ia_addr; 928 rtalloc_ign_fib(&ia_ro, 0, 0); 929 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) && 930 (ia_ro.ro_rt->rt_ifp == V_loif)) { 931 RT_LOCK(ia_ro.ro_rt); 932 RT_ADDREF(ia_ro.ro_rt); 933 RTFREE_LOCKED(ia_ro.ro_rt); 934 } else 935 error = ifa_add_loopback_route((struct ifaddr *)ia, 936 (struct sockaddr *)&ia->ia_addr); 937 if (error == 0) 938 ia->ia_flags |= IFA_RTSELF; 939 if (ia_ro.ro_rt != NULL) 940 RTFREE(ia_ro.ro_rt); 941 } 942 943 return (error); 944 } 945 946 #define rtinitflags(x) \ 947 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 948 ? RTF_HOST : 0) 949 950 /* 951 * Generate a routing message when inserting or deleting 952 * an interface address alias. 953 */ 954 static void in_addralias_rtmsg(int cmd, struct in_addr *prefix, 955 struct in_ifaddr *target) 956 { 957 struct route pfx_ro; 958 struct sockaddr_in *pfx_addr; 959 struct rtentry msg_rt; 960 961 /* QL: XXX 962 * This is a bit questionable because there is no 963 * additional route entry added/deleted for an address 964 * alias. Therefore this route report is inaccurate. 965 */ 966 bzero(&pfx_ro, sizeof(pfx_ro)); 967 pfx_addr = (struct sockaddr_in *)(&pfx_ro.ro_dst); 968 pfx_addr->sin_len = sizeof(*pfx_addr); 969 pfx_addr->sin_family = AF_INET; 970 pfx_addr->sin_addr = *prefix; 971 rtalloc_ign_fib(&pfx_ro, 0, 0); 972 if (pfx_ro.ro_rt != NULL) { 973 msg_rt = *pfx_ro.ro_rt; 974 975 /* QL: XXX 976 * Point the gateway to the new interface 977 * address as if a new prefix route entry has 978 * been added through the new address alias. 979 * All other parts of the rtentry is accurate, 980 * e.g., rt_key, rt_mask, rt_ifp etc. 981 */ 982 msg_rt.rt_gateway = 983 (struct sockaddr *)&target->ia_addr; 984 rt_newaddrmsg(cmd, 985 (struct ifaddr *)target, 986 0, &msg_rt); 987 RTFREE(pfx_ro.ro_rt); 988 } 989 return; 990 } 991 992 /* 993 * Check if we have a route for the given prefix already or add one accordingly. 994 */ 995 static int 996 in_addprefix(struct in_ifaddr *target, int flags) 997 { 998 struct in_ifaddr *ia; 999 struct in_addr prefix, mask, p, m; 1000 int error; 1001 1002 if ((flags & RTF_HOST) != 0) { 1003 prefix = target->ia_dstaddr.sin_addr; 1004 mask.s_addr = 0; 1005 } else { 1006 prefix = target->ia_addr.sin_addr; 1007 mask = target->ia_sockmask.sin_addr; 1008 prefix.s_addr &= mask.s_addr; 1009 } 1010 1011 IN_IFADDR_RLOCK(); 1012 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1013 if (rtinitflags(ia)) { 1014 p = ia->ia_dstaddr.sin_addr; 1015 1016 if (prefix.s_addr != p.s_addr) 1017 continue; 1018 } else { 1019 p = ia->ia_addr.sin_addr; 1020 m = ia->ia_sockmask.sin_addr; 1021 p.s_addr &= m.s_addr; 1022 1023 if (prefix.s_addr != p.s_addr || 1024 mask.s_addr != m.s_addr) 1025 continue; 1026 } 1027 1028 /* 1029 * If we got a matching prefix route inserted by other 1030 * interface address, we are done here. 1031 */ 1032 if (ia->ia_flags & IFA_ROUTE) { 1033 #ifdef RADIX_MPATH 1034 if (ia->ia_addr.sin_addr.s_addr == 1035 target->ia_addr.sin_addr.s_addr) { 1036 IN_IFADDR_RUNLOCK(); 1037 return (EEXIST); 1038 } else 1039 break; 1040 #endif 1041 if (V_sameprefixcarponly && 1042 target->ia_ifp->if_type != IFT_CARP && 1043 ia->ia_ifp->if_type != IFT_CARP) { 1044 IN_IFADDR_RUNLOCK(); 1045 return (EEXIST); 1046 } else { 1047 in_addralias_rtmsg(RTM_ADD, &prefix, target); 1048 IN_IFADDR_RUNLOCK(); 1049 return (0); 1050 } 1051 } 1052 } 1053 IN_IFADDR_RUNLOCK(); 1054 1055 /* 1056 * No-one seem to have this prefix route, so we try to insert it. 1057 */ 1058 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 1059 if (!error) 1060 target->ia_flags |= IFA_ROUTE; 1061 return (error); 1062 } 1063 1064 extern void arp_ifscrub(struct ifnet *ifp, uint32_t addr); 1065 1066 /* 1067 * If there is no other address in the system that can serve a route to the 1068 * same prefix, remove the route. Hand over the route to the new address 1069 * otherwise. 1070 */ 1071 static int 1072 in_scrubprefix(struct in_ifaddr *target, u_int flags) 1073 { 1074 struct in_ifaddr *ia; 1075 struct in_addr prefix, mask, p, m; 1076 int error = 0; 1077 struct sockaddr_in prefix0, mask0; 1078 1079 /* 1080 * Remove the loopback route to the interface address. 1081 * The "useloopback" setting is not consulted because if the 1082 * user configures an interface address, turns off this 1083 * setting, and then tries to delete that interface address, 1084 * checking the current setting of "useloopback" would leave 1085 * that interface address loopback route untouched, which 1086 * would be wrong. Therefore the interface address loopback route 1087 * deletion is unconditional. 1088 */ 1089 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) && 1090 !(target->ia_ifp->if_flags & IFF_LOOPBACK) && 1091 (target->ia_flags & IFA_RTSELF)) { 1092 struct route ia_ro; 1093 int freeit = 0; 1094 1095 bzero(&ia_ro, sizeof(ia_ro)); 1096 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = target->ia_addr; 1097 rtalloc_ign_fib(&ia_ro, 0, 0); 1098 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) && 1099 (ia_ro.ro_rt->rt_ifp == V_loif)) { 1100 RT_LOCK(ia_ro.ro_rt); 1101 if (ia_ro.ro_rt->rt_refcnt <= 1) 1102 freeit = 1; 1103 else if (flags & LLE_STATIC) { 1104 RT_REMREF(ia_ro.ro_rt); 1105 target->ia_flags &= ~IFA_RTSELF; 1106 } 1107 RTFREE_LOCKED(ia_ro.ro_rt); 1108 } 1109 if (freeit && (flags & LLE_STATIC)) { 1110 error = ifa_del_loopback_route((struct ifaddr *)target, 1111 (struct sockaddr *)&target->ia_addr); 1112 if (error == 0) 1113 target->ia_flags &= ~IFA_RTSELF; 1114 } 1115 if ((flags & LLE_STATIC) && 1116 !(target->ia_ifp->if_flags & IFF_NOARP)) 1117 /* remove arp cache */ 1118 arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr); 1119 } 1120 1121 if (rtinitflags(target)) { 1122 prefix = target->ia_dstaddr.sin_addr; 1123 mask.s_addr = 0; 1124 } else { 1125 prefix = target->ia_addr.sin_addr; 1126 mask = target->ia_sockmask.sin_addr; 1127 prefix.s_addr &= mask.s_addr; 1128 } 1129 1130 if ((target->ia_flags & IFA_ROUTE) == 0) { 1131 in_addralias_rtmsg(RTM_DELETE, &prefix, target); 1132 return (0); 1133 } 1134 1135 IN_IFADDR_RLOCK(); 1136 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1137 if (rtinitflags(ia)) { 1138 p = ia->ia_dstaddr.sin_addr; 1139 1140 if (prefix.s_addr != p.s_addr) 1141 continue; 1142 } else { 1143 p = ia->ia_addr.sin_addr; 1144 m = ia->ia_sockmask.sin_addr; 1145 p.s_addr &= m.s_addr; 1146 1147 if (prefix.s_addr != p.s_addr || 1148 mask.s_addr != m.s_addr) 1149 continue; 1150 } 1151 1152 if ((ia->ia_ifp->if_flags & IFF_UP) == 0) 1153 continue; 1154 1155 /* 1156 * If we got a matching prefix address, move IFA_ROUTE and 1157 * the route itself to it. Make sure that routing daemons 1158 * get a heads-up. 1159 * 1160 * XXX: a special case for carp(4) interface - this should 1161 * be more generally specified as an interface that 1162 * doesn't support such action. 1163 */ 1164 if ((ia->ia_flags & IFA_ROUTE) == 0 1165 && (ia->ia_ifp->if_type != IFT_CARP)) { 1166 ifa_ref(&ia->ia_ifa); 1167 IN_IFADDR_RUNLOCK(); 1168 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, 1169 rtinitflags(target)); 1170 if (error == 0) 1171 target->ia_flags &= ~IFA_ROUTE; 1172 else 1173 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n", 1174 error); 1175 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 1176 rtinitflags(ia) | RTF_UP); 1177 if (error == 0) 1178 ia->ia_flags |= IFA_ROUTE; 1179 else 1180 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n", 1181 error); 1182 ifa_free(&ia->ia_ifa); 1183 return (error); 1184 } 1185 } 1186 IN_IFADDR_RUNLOCK(); 1187 1188 /* 1189 * remove all L2 entries on the given prefix 1190 */ 1191 bzero(&prefix0, sizeof(prefix0)); 1192 prefix0.sin_len = sizeof(prefix0); 1193 prefix0.sin_family = AF_INET; 1194 prefix0.sin_addr.s_addr = target->ia_subnet; 1195 bzero(&mask0, sizeof(mask0)); 1196 mask0.sin_len = sizeof(mask0); 1197 mask0.sin_family = AF_INET; 1198 mask0.sin_addr.s_addr = target->ia_subnetmask; 1199 lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0, 1200 (struct sockaddr *)&mask0, flags); 1201 1202 /* 1203 * As no-one seem to have this prefix, we can remove the route. 1204 */ 1205 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 1206 if (error == 0) 1207 target->ia_flags &= ~IFA_ROUTE; 1208 else 1209 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error); 1210 return (error); 1211 } 1212 1213 #undef rtinitflags 1214 1215 /* 1216 * Return 1 if the address might be a local broadcast address. 1217 */ 1218 int 1219 in_broadcast(struct in_addr in, struct ifnet *ifp) 1220 { 1221 register struct ifaddr *ifa; 1222 u_long t; 1223 1224 if (in.s_addr == INADDR_BROADCAST || 1225 in.s_addr == INADDR_ANY) 1226 return (1); 1227 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1228 return (0); 1229 t = ntohl(in.s_addr); 1230 /* 1231 * Look through the list of addresses for a match 1232 * with a broadcast address. 1233 */ 1234 #define ia ((struct in_ifaddr *)ifa) 1235 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1236 if (ifa->ifa_addr->sa_family == AF_INET && 1237 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1238 /* 1239 * Check for old-style (host 0) broadcast, but 1240 * taking into account that RFC 3021 obsoletes it. 1241 */ 1242 (ia->ia_subnetmask != IN_RFC3021_MASK && 1243 t == ia->ia_subnet)) && 1244 /* 1245 * Check for an all one subnetmask. These 1246 * only exist when an interface gets a secondary 1247 * address. 1248 */ 1249 ia->ia_subnetmask != (u_long)0xffffffff) 1250 return (1); 1251 return (0); 1252 #undef ia 1253 } 1254 1255 /* 1256 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 1257 */ 1258 void 1259 in_ifdetach(struct ifnet *ifp) 1260 { 1261 1262 in_pcbpurgeif0(&V_ripcbinfo, ifp); 1263 in_pcbpurgeif0(&V_udbinfo, ifp); 1264 in_purgemaddrs(ifp); 1265 } 1266 1267 /* 1268 * Delete all IPv4 multicast address records, and associated link-layer 1269 * multicast address records, associated with ifp. 1270 * XXX It looks like domifdetach runs AFTER the link layer cleanup. 1271 * XXX This should not race with ifma_protospec being set during 1272 * a new allocation, if it does, we have bigger problems. 1273 */ 1274 static void 1275 in_purgemaddrs(struct ifnet *ifp) 1276 { 1277 LIST_HEAD(,in_multi) purgeinms; 1278 struct in_multi *inm, *tinm; 1279 struct ifmultiaddr *ifma; 1280 1281 LIST_INIT(&purgeinms); 1282 IN_MULTI_LOCK(); 1283 1284 /* 1285 * Extract list of in_multi associated with the detaching ifp 1286 * which the PF_INET layer is about to release. 1287 * We need to do this as IF_ADDR_LOCK() may be re-acquired 1288 * by code further down. 1289 */ 1290 IF_ADDR_LOCK(ifp); 1291 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1292 if (ifma->ifma_addr->sa_family != AF_INET || 1293 ifma->ifma_protospec == NULL) 1294 continue; 1295 #if 0 1296 KASSERT(ifma->ifma_protospec != NULL, 1297 ("%s: ifma_protospec is NULL", __func__)); 1298 #endif 1299 inm = (struct in_multi *)ifma->ifma_protospec; 1300 LIST_INSERT_HEAD(&purgeinms, inm, inm_link); 1301 } 1302 IF_ADDR_UNLOCK(ifp); 1303 1304 LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) { 1305 LIST_REMOVE(inm, inm_link); 1306 inm_release_locked(inm); 1307 } 1308 igmp_ifdetach(ifp); 1309 1310 IN_MULTI_UNLOCK(); 1311 } 1312 1313 #include <net/if_dl.h> 1314 #include <netinet/if_ether.h> 1315 1316 struct in_llentry { 1317 struct llentry base; 1318 struct sockaddr_in l3_addr4; 1319 }; 1320 1321 static struct llentry * 1322 in_lltable_new(const struct sockaddr *l3addr, u_int flags) 1323 { 1324 struct in_llentry *lle; 1325 1326 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_DONTWAIT | M_ZERO); 1327 if (lle == NULL) /* NB: caller generates msg */ 1328 return NULL; 1329 1330 callout_init(&lle->base.la_timer, CALLOUT_MPSAFE); 1331 /* 1332 * For IPv4 this will trigger "arpresolve" to generate 1333 * an ARP request. 1334 */ 1335 lle->base.la_expire = time_uptime; /* mark expired */ 1336 lle->l3_addr4 = *(const struct sockaddr_in *)l3addr; 1337 lle->base.lle_refcnt = 1; 1338 LLE_LOCK_INIT(&lle->base); 1339 return &lle->base; 1340 } 1341 1342 /* 1343 * Deletes an address from the address table. 1344 * This function is called by the timer functions 1345 * such as arptimer() and nd6_llinfo_timer(), and 1346 * the caller does the locking. 1347 */ 1348 static void 1349 in_lltable_free(struct lltable *llt, struct llentry *lle) 1350 { 1351 LLE_WUNLOCK(lle); 1352 LLE_LOCK_DESTROY(lle); 1353 free(lle, M_LLTABLE); 1354 } 1355 1356 1357 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 1358 (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 ) 1359 1360 static void 1361 in_lltable_prefix_free(struct lltable *llt, 1362 const struct sockaddr *prefix, 1363 const struct sockaddr *mask, 1364 u_int flags) 1365 { 1366 const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix; 1367 const struct sockaddr_in *msk = (const struct sockaddr_in *)mask; 1368 struct llentry *lle, *next; 1369 register int i; 1370 size_t pkts_dropped; 1371 1372 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) { 1373 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 1374 1375 /* 1376 * (flags & LLE_STATIC) means deleting all entries 1377 * including static ARP entries 1378 */ 1379 if (IN_ARE_MASKED_ADDR_EQUAL((struct sockaddr_in *)L3_ADDR(lle), 1380 pfx, msk) && 1381 ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) { 1382 int canceled; 1383 1384 canceled = callout_drain(&lle->la_timer); 1385 LLE_WLOCK(lle); 1386 if (canceled) 1387 LLE_REMREF(lle); 1388 pkts_dropped = llentry_free(lle); 1389 ARPSTAT_ADD(dropped, pkts_dropped); 1390 } 1391 } 1392 } 1393 } 1394 1395 1396 static int 1397 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr) 1398 { 1399 struct rtentry *rt; 1400 1401 KASSERT(l3addr->sa_family == AF_INET, 1402 ("sin_family %d", l3addr->sa_family)); 1403 1404 /* XXX rtalloc1 should take a const param */ 1405 rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0); 1406 1407 if (rt == NULL) 1408 return (EINVAL); 1409 1410 /* 1411 * If the gateway for an existing host route matches the target L3 1412 * address, which is a special route inserted by some implementation 1413 * such as MANET, and the interface is of the correct type, then 1414 * allow for ARP to proceed. 1415 */ 1416 if (rt->rt_flags & RTF_GATEWAY) { 1417 if (!(rt->rt_flags & RTF_HOST) || !rt->rt_ifp || 1418 rt->rt_ifp->if_type != IFT_ETHER || 1419 (rt->rt_ifp->if_flags & 1420 (IFF_NOARP | IFF_STATICARP)) != 0 || 1421 memcmp(rt->rt_gateway->sa_data, l3addr->sa_data, 1422 sizeof(in_addr_t)) != 0) { 1423 RTFREE_LOCKED(rt); 1424 return (EINVAL); 1425 } 1426 } 1427 1428 /* 1429 * Make sure that at least the destination address is covered 1430 * by the route. This is for handling the case where 2 or more 1431 * interfaces have the same prefix. An incoming packet arrives 1432 * on one interface and the corresponding outgoing packet leaves 1433 * another interface. 1434 */ 1435 if (!(rt->rt_flags & RTF_HOST) && rt->rt_ifp != ifp) { 1436 const char *sa, *mask, *addr, *lim; 1437 int len; 1438 1439 mask = (const char *)rt_mask(rt); 1440 /* 1441 * Just being extra cautious to avoid some custom 1442 * code getting into trouble. 1443 */ 1444 if (mask == NULL) { 1445 RTFREE_LOCKED(rt); 1446 return (EINVAL); 1447 } 1448 1449 sa = (const char *)rt_key(rt); 1450 addr = (const char *)l3addr; 1451 len = ((const struct sockaddr_in *)l3addr)->sin_len; 1452 lim = addr + len; 1453 1454 for ( ; addr < lim; sa++, mask++, addr++) { 1455 if ((*sa ^ *addr) & *mask) { 1456 #ifdef DIAGNOSTIC 1457 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n", 1458 inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr)); 1459 #endif 1460 RTFREE_LOCKED(rt); 1461 return (EINVAL); 1462 } 1463 } 1464 } 1465 1466 RTFREE_LOCKED(rt); 1467 return (0); 1468 } 1469 1470 /* 1471 * Return NULL if not found or marked for deletion. 1472 * If found return lle read locked. 1473 */ 1474 static struct llentry * 1475 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1476 { 1477 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1478 struct ifnet *ifp = llt->llt_ifp; 1479 struct llentry *lle; 1480 struct llentries *lleh; 1481 u_int hashkey; 1482 1483 IF_AFDATA_LOCK_ASSERT(ifp); 1484 KASSERT(l3addr->sa_family == AF_INET, 1485 ("sin_family %d", l3addr->sa_family)); 1486 1487 hashkey = sin->sin_addr.s_addr; 1488 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 1489 LIST_FOREACH(lle, lleh, lle_next) { 1490 struct sockaddr_in *sa2 = (struct sockaddr_in *)L3_ADDR(lle); 1491 if (lle->la_flags & LLE_DELETED) 1492 continue; 1493 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr) 1494 break; 1495 } 1496 if (lle == NULL) { 1497 #ifdef DIAGNOSTIC 1498 if (flags & LLE_DELETE) 1499 log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle); 1500 #endif 1501 if (!(flags & LLE_CREATE)) 1502 return (NULL); 1503 /* 1504 * A route that covers the given address must have 1505 * been installed 1st because we are doing a resolution, 1506 * verify this. 1507 */ 1508 if (!(flags & LLE_IFADDR) && 1509 in_lltable_rtcheck(ifp, flags, l3addr) != 0) 1510 goto done; 1511 1512 lle = in_lltable_new(l3addr, flags); 1513 if (lle == NULL) { 1514 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 1515 goto done; 1516 } 1517 lle->la_flags = flags & ~LLE_CREATE; 1518 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 1519 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 1520 lle->la_flags |= (LLE_VALID | LLE_STATIC); 1521 } 1522 1523 lle->lle_tbl = llt; 1524 lle->lle_head = lleh; 1525 LIST_INSERT_HEAD(lleh, lle, lle_next); 1526 } else if (flags & LLE_DELETE) { 1527 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 1528 LLE_WLOCK(lle); 1529 lle->la_flags = LLE_DELETED; 1530 EVENTHANDLER_INVOKE(arp_update_event, lle); 1531 LLE_WUNLOCK(lle); 1532 #ifdef DIAGNOSTIC 1533 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 1534 #endif 1535 } 1536 lle = (void *)-1; 1537 1538 } 1539 if (LLE_IS_VALID(lle)) { 1540 if (flags & LLE_EXCLUSIVE) 1541 LLE_WLOCK(lle); 1542 else 1543 LLE_RLOCK(lle); 1544 } 1545 done: 1546 return (lle); 1547 } 1548 1549 static int 1550 in_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 1551 { 1552 #define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle)) 1553 struct ifnet *ifp = llt->llt_ifp; 1554 struct llentry *lle; 1555 /* XXX stack use */ 1556 struct { 1557 struct rt_msghdr rtm; 1558 struct sockaddr_inarp sin; 1559 struct sockaddr_dl sdl; 1560 } arpc; 1561 int error, i; 1562 1563 LLTABLE_LOCK_ASSERT(); 1564 1565 error = 0; 1566 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1567 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 1568 struct sockaddr_dl *sdl; 1569 1570 /* skip deleted entries */ 1571 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 1572 continue; 1573 /* Skip if jailed and not a valid IP of the prison. */ 1574 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 1575 continue; 1576 /* 1577 * produce a msg made of: 1578 * struct rt_msghdr; 1579 * struct sockaddr_inarp; (IPv4) 1580 * struct sockaddr_dl; 1581 */ 1582 bzero(&arpc, sizeof(arpc)); 1583 arpc.rtm.rtm_msglen = sizeof(arpc); 1584 arpc.rtm.rtm_version = RTM_VERSION; 1585 arpc.rtm.rtm_type = RTM_GET; 1586 arpc.rtm.rtm_flags = RTF_UP; 1587 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1588 arpc.sin.sin_family = AF_INET; 1589 arpc.sin.sin_len = sizeof(arpc.sin); 1590 arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr; 1591 1592 /* publish */ 1593 if (lle->la_flags & LLE_PUB) { 1594 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1595 /* proxy only */ 1596 if (lle->la_flags & LLE_PROXY) 1597 arpc.sin.sin_other = SIN_PROXY; 1598 } 1599 1600 sdl = &arpc.sdl; 1601 sdl->sdl_family = AF_LINK; 1602 sdl->sdl_len = sizeof(*sdl); 1603 sdl->sdl_index = ifp->if_index; 1604 sdl->sdl_type = ifp->if_type; 1605 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 1606 sdl->sdl_alen = ifp->if_addrlen; 1607 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1608 } else { 1609 sdl->sdl_alen = 0; 1610 bzero(LLADDR(sdl), ifp->if_addrlen); 1611 } 1612 1613 arpc.rtm.rtm_rmx.rmx_expire = 1614 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1615 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1616 if (lle->la_flags & LLE_STATIC) 1617 arpc.rtm.rtm_flags |= RTF_STATIC; 1618 arpc.rtm.rtm_index = ifp->if_index; 1619 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1620 if (error) 1621 break; 1622 } 1623 } 1624 return error; 1625 #undef SIN 1626 } 1627 1628 void * 1629 in_domifattach(struct ifnet *ifp) 1630 { 1631 struct in_ifinfo *ii; 1632 struct lltable *llt; 1633 1634 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); 1635 1636 llt = lltable_init(ifp, AF_INET); 1637 if (llt != NULL) { 1638 llt->llt_free = in_lltable_free; 1639 llt->llt_prefix_free = in_lltable_prefix_free; 1640 llt->llt_lookup = in_lltable_lookup; 1641 llt->llt_dump = in_lltable_dump; 1642 } 1643 ii->ii_llt = llt; 1644 1645 ii->ii_igmp = igmp_domifattach(ifp); 1646 1647 return ii; 1648 } 1649 1650 void 1651 in_domifdetach(struct ifnet *ifp, void *aux) 1652 { 1653 struct in_ifinfo *ii = (struct in_ifinfo *)aux; 1654 1655 igmp_domifdetach(ifp); 1656 lltable_free(ii->ii_llt); 1657 free(ii, M_IFADDR); 1658 } 1659