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/eventhandler.h> 40 #include <sys/systm.h> 41 #include <sys/sockio.h> 42 #include <sys/malloc.h> 43 #include <sys/priv.h> 44 #include <sys/socket.h> 45 #include <sys/jail.h> 46 #include <sys/kernel.h> 47 #include <sys/proc.h> 48 #include <sys/sysctl.h> 49 #include <sys/syslog.h> 50 51 #include <net/if.h> 52 #include <net/if_var.h> 53 #include <net/if_arp.h> 54 #include <net/if_dl.h> 55 #include <net/if_llatbl.h> 56 #include <net/if_types.h> 57 #include <net/route.h> 58 #include <net/vnet.h> 59 60 #include <netinet/if_ether.h> 61 #include <netinet/in.h> 62 #include <netinet/in_var.h> 63 #include <netinet/in_pcb.h> 64 #include <netinet/ip_var.h> 65 #include <netinet/ip_carp.h> 66 #include <netinet/igmp_var.h> 67 #include <netinet/udp.h> 68 #include <netinet/udp_var.h> 69 70 static int in_mask2len(struct in_addr *); 71 static void in_len2mask(struct in_addr *, int); 72 static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, 73 struct ifnet *, struct thread *); 74 75 static void in_socktrim(struct sockaddr_in *); 76 static int in_ifinit(struct ifnet *, struct in_ifaddr *, 77 struct sockaddr_in *, int, int); 78 static void in_purgemaddrs(struct ifnet *); 79 80 static VNET_DEFINE(int, nosameprefix); 81 #define V_nosameprefix VNET(nosameprefix) 82 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_RW, 83 &VNET_NAME(nosameprefix), 0, 84 "Refuse to create same prefixes on different interfaces"); 85 86 VNET_DECLARE(struct inpcbinfo, ripcbinfo); 87 #define V_ripcbinfo VNET(ripcbinfo) 88 89 /* 90 * Return 1 if an internet address is for a ``local'' host 91 * (one to which we have a connection). 92 */ 93 int 94 in_localaddr(struct in_addr in) 95 { 96 register u_long i = ntohl(in.s_addr); 97 register struct in_ifaddr *ia; 98 99 IN_IFADDR_RLOCK(); 100 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 101 if ((i & ia->ia_subnetmask) == ia->ia_subnet) { 102 IN_IFADDR_RUNLOCK(); 103 return (1); 104 } 105 } 106 IN_IFADDR_RUNLOCK(); 107 return (0); 108 } 109 110 /* 111 * Return 1 if an internet address is for the local host and configured 112 * on one of its interfaces. 113 */ 114 int 115 in_localip(struct in_addr in) 116 { 117 struct in_ifaddr *ia; 118 119 IN_IFADDR_RLOCK(); 120 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { 121 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) { 122 IN_IFADDR_RUNLOCK(); 123 return (1); 124 } 125 } 126 IN_IFADDR_RUNLOCK(); 127 return (0); 128 } 129 130 /* 131 * Determine whether an IP address is in a reserved set of addresses 132 * that may not be forwarded, or whether datagrams to that destination 133 * may be forwarded. 134 */ 135 int 136 in_canforward(struct in_addr in) 137 { 138 register u_long i = ntohl(in.s_addr); 139 register u_long net; 140 141 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i)) 142 return (0); 143 if (IN_CLASSA(i)) { 144 net = i & IN_CLASSA_NET; 145 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 146 return (0); 147 } 148 return (1); 149 } 150 151 /* 152 * Trim a mask in a sockaddr 153 */ 154 static void 155 in_socktrim(struct sockaddr_in *ap) 156 { 157 register char *cplim = (char *) &ap->sin_addr; 158 register char *cp = (char *) (&ap->sin_addr + 1); 159 160 ap->sin_len = 0; 161 while (--cp >= cplim) 162 if (*cp) { 163 (ap)->sin_len = cp - (char *) (ap) + 1; 164 break; 165 } 166 } 167 168 static int 169 in_mask2len(mask) 170 struct in_addr *mask; 171 { 172 int x, y; 173 u_char *p; 174 175 p = (u_char *)mask; 176 for (x = 0; x < sizeof(*mask); x++) { 177 if (p[x] != 0xff) 178 break; 179 } 180 y = 0; 181 if (x < sizeof(*mask)) { 182 for (y = 0; y < 8; y++) { 183 if ((p[x] & (0x80 >> y)) == 0) 184 break; 185 } 186 } 187 return (x * 8 + y); 188 } 189 190 static void 191 in_len2mask(struct in_addr *mask, int len) 192 { 193 int i; 194 u_char *p; 195 196 p = (u_char *)mask; 197 bzero(mask, sizeof(*mask)); 198 for (i = 0; i < len / 8; i++) 199 p[i] = 0xff; 200 if (len % 8) 201 p[i] = (0xff00 >> (len % 8)) & 0xff; 202 } 203 204 /* 205 * Generic internet control operations (ioctl's). 206 * 207 * ifp is NULL if not an interface-specific ioctl. 208 */ 209 /* ARGSUSED */ 210 int 211 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 212 struct thread *td) 213 { 214 register struct ifreq *ifr = (struct ifreq *)data; 215 register struct in_ifaddr *ia, *iap; 216 register struct ifaddr *ifa; 217 struct in_addr allhosts_addr; 218 struct in_addr dst; 219 struct in_ifinfo *ii; 220 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 221 int error, hostIsNew, iaIsNew, maskIsNew; 222 int iaIsFirst; 223 u_long ocmd = cmd; 224 225 /* 226 * Pre-10.x compat: OSIOCAIFADDR passes a shorter 227 * struct in_aliasreq, without ifra_vhid. 228 */ 229 if (cmd == OSIOCAIFADDR) 230 cmd = SIOCAIFADDR; 231 232 ia = NULL; 233 iaIsFirst = 0; 234 iaIsNew = 0; 235 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 236 237 /* 238 * Filter out ioctls we implement directly; forward the rest on to 239 * in_lifaddr_ioctl() and ifp->if_ioctl(). 240 */ 241 switch (cmd) { 242 case SIOCGIFADDR: 243 case SIOCGIFBRDADDR: 244 case SIOCGIFDSTADDR: 245 case SIOCGIFNETMASK: 246 case SIOCDIFADDR: 247 break; 248 case SIOCAIFADDR: 249 /* 250 * ifra_addr must be present and be of INET family. 251 * ifra_broadaddr and ifra_mask are optional. 252 */ 253 if (ifra->ifra_addr.sin_len != sizeof(struct sockaddr_in) || 254 ifra->ifra_addr.sin_family != AF_INET) 255 return (EINVAL); 256 if (ifra->ifra_broadaddr.sin_len != 0 && 257 (ifra->ifra_broadaddr.sin_len != 258 sizeof(struct sockaddr_in) || 259 ifra->ifra_broadaddr.sin_family != AF_INET)) 260 return (EINVAL); 261 #if 0 262 /* 263 * ifconfig(8) in pre-10.x doesn't set sin_family for the 264 * mask. The code is disabled for the 10.x timeline, to 265 * make SIOCAIFADDR compatible with 9.x ifconfig(8). 266 * The code should be enabled in 11.x 267 */ 268 if (ifra->ifra_mask.sin_len != 0 && 269 (ifra->ifra_mask.sin_len != sizeof(struct sockaddr_in) || 270 ifra->ifra_mask.sin_family != AF_INET)) 271 return (EINVAL); 272 #endif 273 break; 274 case SIOCSIFADDR: 275 case SIOCSIFBRDADDR: 276 case SIOCSIFDSTADDR: 277 case SIOCSIFNETMASK: 278 /* We no longer support that old commands. */ 279 return (EINVAL); 280 281 case SIOCALIFADDR: 282 if (td != NULL) { 283 error = priv_check(td, PRIV_NET_ADDIFADDR); 284 if (error) 285 return (error); 286 } 287 if (ifp == NULL) 288 return (EINVAL); 289 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 290 291 case SIOCDLIFADDR: 292 if (td != NULL) { 293 error = priv_check(td, PRIV_NET_DELIFADDR); 294 if (error) 295 return (error); 296 } 297 if (ifp == NULL) 298 return (EINVAL); 299 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 300 301 case SIOCGLIFADDR: 302 if (ifp == NULL) 303 return (EINVAL); 304 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 305 306 default: 307 if (ifp == NULL || ifp->if_ioctl == NULL) 308 return (EOPNOTSUPP); 309 return ((*ifp->if_ioctl)(ifp, cmd, data)); 310 } 311 312 if (ifp == NULL) 313 return (EADDRNOTAVAIL); 314 315 /* 316 * Security checks before we get involved in any work. 317 */ 318 switch (cmd) { 319 case SIOCAIFADDR: 320 if (td != NULL) { 321 error = priv_check(td, PRIV_NET_ADDIFADDR); 322 if (error) 323 return (error); 324 } 325 break; 326 327 case SIOCDIFADDR: 328 if (td != NULL) { 329 error = priv_check(td, PRIV_NET_DELIFADDR); 330 if (error) 331 return (error); 332 } 333 break; 334 } 335 336 /* 337 * Find address for this interface, if it exists. 338 * 339 * If an alias address was specified, find that one instead of the 340 * first one on the interface, if possible. 341 */ 342 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 343 IN_IFADDR_RLOCK(); 344 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) { 345 if (iap->ia_ifp == ifp && 346 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 347 if (td == NULL || prison_check_ip4(td->td_ucred, 348 &dst) == 0) 349 ia = iap; 350 break; 351 } 352 } 353 if (ia != NULL) 354 ifa_ref(&ia->ia_ifa); 355 IN_IFADDR_RUNLOCK(); 356 if (ia == NULL) { 357 IF_ADDR_RLOCK(ifp); 358 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 359 iap = ifatoia(ifa); 360 if (iap->ia_addr.sin_family == AF_INET) { 361 if (td != NULL && 362 prison_check_ip4(td->td_ucred, 363 &iap->ia_addr.sin_addr) != 0) 364 continue; 365 ia = iap; 366 break; 367 } 368 } 369 if (ia != NULL) 370 ifa_ref(&ia->ia_ifa); 371 IF_ADDR_RUNLOCK(ifp); 372 } 373 if (ia == NULL) 374 iaIsFirst = 1; 375 376 error = 0; 377 switch (cmd) { 378 case SIOCAIFADDR: 379 case SIOCDIFADDR: 380 if (ifra->ifra_addr.sin_family == AF_INET) { 381 struct in_ifaddr *oia; 382 383 IN_IFADDR_RLOCK(); 384 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 385 if (ia->ia_ifp == ifp && 386 ia->ia_addr.sin_addr.s_addr == 387 ifra->ifra_addr.sin_addr.s_addr) 388 break; 389 } 390 if (ia != NULL && ia != oia) 391 ifa_ref(&ia->ia_ifa); 392 if (oia != NULL && ia != oia) 393 ifa_free(&oia->ia_ifa); 394 IN_IFADDR_RUNLOCK(); 395 if ((ifp->if_flags & IFF_POINTOPOINT) 396 && (cmd == SIOCAIFADDR) 397 && (ifra->ifra_dstaddr.sin_addr.s_addr 398 == INADDR_ANY)) { 399 error = EDESTADDRREQ; 400 goto out; 401 } 402 } 403 if (cmd == SIOCDIFADDR && ia == NULL) { 404 error = EADDRNOTAVAIL; 405 goto out; 406 } 407 if (ia == NULL) { 408 ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK); 409 ia = (struct in_ifaddr *)ifa; 410 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 411 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 412 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 413 414 ia->ia_sockmask.sin_len = 8; 415 ia->ia_sockmask.sin_family = AF_INET; 416 if (ifp->if_flags & IFF_BROADCAST) { 417 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 418 ia->ia_broadaddr.sin_family = AF_INET; 419 } 420 ia->ia_ifp = ifp; 421 422 ifa_ref(ifa); /* if_addrhead */ 423 IF_ADDR_WLOCK(ifp); 424 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 425 IF_ADDR_WUNLOCK(ifp); 426 ifa_ref(ifa); /* in_ifaddrhead */ 427 IN_IFADDR_WLOCK(); 428 TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link); 429 IN_IFADDR_WUNLOCK(); 430 iaIsNew = 1; 431 } 432 break; 433 434 case SIOCGIFADDR: 435 case SIOCGIFNETMASK: 436 case SIOCGIFDSTADDR: 437 case SIOCGIFBRDADDR: 438 if (ia == NULL) { 439 error = EADDRNOTAVAIL; 440 goto out; 441 } 442 break; 443 } 444 445 /* 446 * Most paths in this switch return directly or via out. Only paths 447 * that remove the address break in order to hit common removal code. 448 */ 449 switch (cmd) { 450 case SIOCGIFADDR: 451 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 452 goto out; 453 454 case SIOCGIFBRDADDR: 455 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 456 error = EINVAL; 457 goto out; 458 } 459 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 460 goto out; 461 462 case SIOCGIFDSTADDR: 463 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 464 error = EINVAL; 465 goto out; 466 } 467 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 468 goto out; 469 470 case SIOCGIFNETMASK: 471 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 472 goto out; 473 474 case SIOCAIFADDR: 475 maskIsNew = 0; 476 hostIsNew = 1; 477 error = 0; 478 if (ifra->ifra_addr.sin_addr.s_addr == 479 ia->ia_addr.sin_addr.s_addr) 480 hostIsNew = 0; 481 if (ifra->ifra_mask.sin_len) { 482 /* 483 * QL: XXX 484 * Need to scrub the prefix here in case 485 * the issued command is SIOCAIFADDR with 486 * the same address, but with a different 487 * prefix length. And if the prefix length 488 * is the same as before, then the call is 489 * un-necessarily executed here. 490 */ 491 in_scrubprefix(ia, LLE_STATIC); 492 ia->ia_sockmask = ifra->ifra_mask; 493 ia->ia_sockmask.sin_family = AF_INET; 494 ia->ia_subnetmask = 495 ntohl(ia->ia_sockmask.sin_addr.s_addr); 496 maskIsNew = 1; 497 } 498 if ((ifp->if_flags & IFF_POINTOPOINT) && 499 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 500 in_scrubprefix(ia, LLE_STATIC); 501 ia->ia_dstaddr = ifra->ifra_dstaddr; 502 maskIsNew = 1; /* We lie; but the effect's the same */ 503 } 504 if (hostIsNew || maskIsNew) 505 error = in_ifinit(ifp, ia, &ifra->ifra_addr, maskIsNew, 506 (ocmd == cmd ? ifra->ifra_vhid : 0)); 507 if (error != 0 && iaIsNew) 508 break; 509 510 if ((ifp->if_flags & IFF_BROADCAST) && 511 ifra->ifra_broadaddr.sin_len) 512 ia->ia_broadaddr = ifra->ifra_broadaddr; 513 if (error == 0) { 514 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 515 if (iaIsFirst && 516 (ifp->if_flags & IFF_MULTICAST) != 0) { 517 error = in_joingroup(ifp, &allhosts_addr, 518 NULL, &ii->ii_allhosts); 519 } 520 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 521 } 522 goto out; 523 524 case SIOCDIFADDR: 525 /* 526 * in_scrubprefix() kills the interface route. 527 */ 528 in_scrubprefix(ia, LLE_STATIC); 529 530 /* 531 * in_ifadown gets rid of all the rest of 532 * the routes. This is not quite the right 533 * thing to do, but at least if we are running 534 * a routing process they will come back. 535 */ 536 in_ifadown(&ia->ia_ifa, 1); 537 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 538 error = 0; 539 break; 540 541 default: 542 panic("in_control: unsupported ioctl"); 543 } 544 545 if (ia->ia_ifa.ifa_carp) 546 (*carp_detach_p)(&ia->ia_ifa); 547 548 IF_ADDR_WLOCK(ifp); 549 /* Re-check that ia is still part of the list. */ 550 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 551 if (ifa == &ia->ia_ifa) 552 break; 553 } 554 if (ifa == NULL) { 555 /* 556 * If we lost the race with another thread, there is no need to 557 * try it again for the next loop as there is no other exit 558 * path between here and out. 559 */ 560 IF_ADDR_WUNLOCK(ifp); 561 error = EADDRNOTAVAIL; 562 goto out; 563 } 564 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 565 IF_ADDR_WUNLOCK(ifp); 566 ifa_free(&ia->ia_ifa); /* if_addrhead */ 567 568 IN_IFADDR_WLOCK(); 569 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link); 570 571 LIST_REMOVE(ia, ia_hash); 572 IN_IFADDR_WUNLOCK(); 573 /* 574 * If this is the last IPv4 address configured on this 575 * interface, leave the all-hosts group. 576 * No state-change report need be transmitted. 577 */ 578 IFP_TO_IA(ifp, iap); 579 if (iap == NULL) { 580 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 581 IN_MULTI_LOCK(); 582 if (ii->ii_allhosts) { 583 (void)in_leavegroup_locked(ii->ii_allhosts, NULL); 584 ii->ii_allhosts = NULL; 585 } 586 IN_MULTI_UNLOCK(); 587 } else 588 ifa_free(&iap->ia_ifa); 589 590 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 591 out: 592 if (ia != NULL) 593 ifa_free(&ia->ia_ifa); 594 return (error); 595 } 596 597 /* 598 * SIOC[GAD]LIFADDR. 599 * SIOCGLIFADDR: get first address. (?!?) 600 * SIOCGLIFADDR with IFLR_PREFIX: 601 * get first address that matches the specified prefix. 602 * SIOCALIFADDR: add the specified address. 603 * SIOCALIFADDR with IFLR_PREFIX: 604 * EINVAL since we can't deduce hostid part of the address. 605 * SIOCDLIFADDR: delete the specified address. 606 * SIOCDLIFADDR with IFLR_PREFIX: 607 * delete the first address that matches the specified prefix. 608 * return values: 609 * EINVAL on invalid parameters 610 * EADDRNOTAVAIL on prefix match failed/specified address not found 611 * other values may be returned from in_ioctl() 612 */ 613 static int 614 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 615 struct ifnet *ifp, struct thread *td) 616 { 617 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 618 struct ifaddr *ifa; 619 620 /* sanity checks */ 621 if (data == NULL || ifp == NULL) { 622 panic("invalid argument to in_lifaddr_ioctl"); 623 /*NOTRECHED*/ 624 } 625 626 switch (cmd) { 627 case SIOCGLIFADDR: 628 /* address must be specified on GET with IFLR_PREFIX */ 629 if ((iflr->flags & IFLR_PREFIX) == 0) 630 break; 631 /*FALLTHROUGH*/ 632 case SIOCALIFADDR: 633 case SIOCDLIFADDR: 634 /* address must be specified on ADD and DELETE */ 635 if (iflr->addr.ss_family != AF_INET) 636 return (EINVAL); 637 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 638 return (EINVAL); 639 /* XXX need improvement */ 640 if (iflr->dstaddr.ss_family 641 && iflr->dstaddr.ss_family != AF_INET) 642 return (EINVAL); 643 if (iflr->dstaddr.ss_family 644 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 645 return (EINVAL); 646 break; 647 default: /*shouldn't happen*/ 648 return (EOPNOTSUPP); 649 } 650 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 651 return (EINVAL); 652 653 switch (cmd) { 654 case SIOCALIFADDR: 655 { 656 struct in_aliasreq ifra; 657 658 if (iflr->flags & IFLR_PREFIX) 659 return (EINVAL); 660 661 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR). */ 662 bzero(&ifra, sizeof(ifra)); 663 bcopy(iflr->iflr_name, ifra.ifra_name, 664 sizeof(ifra.ifra_name)); 665 666 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 667 668 if (iflr->dstaddr.ss_family) { /*XXX*/ 669 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 670 iflr->dstaddr.ss_len); 671 } 672 673 ifra.ifra_mask.sin_family = AF_INET; 674 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 675 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 676 677 return (in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td)); 678 } 679 case SIOCGLIFADDR: 680 case SIOCDLIFADDR: 681 { 682 struct in_ifaddr *ia; 683 struct in_addr mask, candidate, match; 684 struct sockaddr_in *sin; 685 686 bzero(&mask, sizeof(mask)); 687 bzero(&match, sizeof(match)); 688 if (iflr->flags & IFLR_PREFIX) { 689 /* lookup a prefix rather than address. */ 690 in_len2mask(&mask, iflr->prefixlen); 691 692 sin = (struct sockaddr_in *)&iflr->addr; 693 match.s_addr = sin->sin_addr.s_addr; 694 match.s_addr &= mask.s_addr; 695 696 /* if you set extra bits, that's wrong */ 697 if (match.s_addr != sin->sin_addr.s_addr) 698 return (EINVAL); 699 700 } else { 701 /* on getting an address, take the 1st match */ 702 /* on deleting an address, do exact match */ 703 if (cmd != SIOCGLIFADDR) { 704 in_len2mask(&mask, 32); 705 sin = (struct sockaddr_in *)&iflr->addr; 706 match.s_addr = sin->sin_addr.s_addr; 707 } 708 } 709 710 IF_ADDR_RLOCK(ifp); 711 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 712 if (ifa->ifa_addr->sa_family != AF_INET) 713 continue; 714 if (match.s_addr == 0) 715 break; 716 sin = (struct sockaddr_in *)&ifa->ifa_addr; 717 candidate.s_addr = sin->sin_addr.s_addr; 718 candidate.s_addr &= mask.s_addr; 719 if (candidate.s_addr == match.s_addr) 720 break; 721 } 722 if (ifa != NULL) 723 ifa_ref(ifa); 724 IF_ADDR_RUNLOCK(ifp); 725 if (ifa == NULL) 726 return (EADDRNOTAVAIL); 727 ia = (struct in_ifaddr *)ifa; 728 729 if (cmd == SIOCGLIFADDR) { 730 /* fill in the if_laddrreq structure */ 731 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 732 733 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 734 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 735 ia->ia_dstaddr.sin_len); 736 } else 737 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 738 739 iflr->prefixlen = 740 in_mask2len(&ia->ia_sockmask.sin_addr); 741 742 iflr->flags = 0; /*XXX*/ 743 ifa_free(ifa); 744 745 return (0); 746 } else { 747 struct in_aliasreq ifra; 748 749 /* fill in_aliasreq and do ioctl(SIOCDIFADDR) */ 750 bzero(&ifra, sizeof(ifra)); 751 bcopy(iflr->iflr_name, ifra.ifra_name, 752 sizeof(ifra.ifra_name)); 753 754 bcopy(&ia->ia_addr, &ifra.ifra_addr, 755 ia->ia_addr.sin_len); 756 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 757 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 758 ia->ia_dstaddr.sin_len); 759 } 760 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 761 ia->ia_sockmask.sin_len); 762 ifa_free(ifa); 763 764 return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 765 ifp, td)); 766 } 767 } 768 } 769 770 return (EOPNOTSUPP); /*just for safety*/ 771 } 772 773 /* 774 * Initialize an interface's internet address 775 * and routing table entry. 776 */ 777 static int 778 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, 779 int masksupplied, int vhid) 780 { 781 register u_long i = ntohl(sin->sin_addr.s_addr); 782 int flags, error = 0; 783 784 IN_IFADDR_WLOCK(); 785 if (ia->ia_addr.sin_family == AF_INET) 786 LIST_REMOVE(ia, ia_hash); 787 ia->ia_addr = *sin; 788 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 789 ia, ia_hash); 790 IN_IFADDR_WUNLOCK(); 791 792 if (vhid > 0) { 793 if (carp_attach_p != NULL) 794 error = (*carp_attach_p)(&ia->ia_ifa, vhid); 795 else 796 error = EPROTONOSUPPORT; 797 } 798 if (error) 799 return (error); 800 801 /* 802 * Give the interface a chance to initialize 803 * if this is its first address, 804 * and to validate the address if necessary. 805 */ 806 if (ifp->if_ioctl != NULL && 807 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia)) != 0) 808 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 809 return (error); 810 811 /* 812 * Be compatible with network classes, if netmask isn't supplied, 813 * guess it based on classes. 814 */ 815 if (!masksupplied) { 816 if (IN_CLASSA(i)) 817 ia->ia_subnetmask = IN_CLASSA_NET; 818 else if (IN_CLASSB(i)) 819 ia->ia_subnetmask = IN_CLASSB_NET; 820 else 821 ia->ia_subnetmask = IN_CLASSC_NET; 822 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 823 } 824 ia->ia_subnet = i & ia->ia_subnetmask; 825 in_socktrim(&ia->ia_sockmask); 826 827 /* 828 * Add route for the network. 829 */ 830 flags = RTF_UP; 831 ia->ia_ifa.ifa_metric = ifp->if_metric; 832 if (ifp->if_flags & IFF_BROADCAST) { 833 if (ia->ia_subnetmask == IN_RFC3021_MASK) 834 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST; 835 else 836 ia->ia_broadaddr.sin_addr.s_addr = 837 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 838 } else if (ifp->if_flags & IFF_LOOPBACK) { 839 ia->ia_dstaddr = ia->ia_addr; 840 flags |= RTF_HOST; 841 } else if (ifp->if_flags & IFF_POINTOPOINT) { 842 if (ia->ia_dstaddr.sin_family != AF_INET) 843 return (0); 844 flags |= RTF_HOST; 845 } 846 if (!vhid && (error = in_addprefix(ia, flags)) != 0) 847 return (error); 848 849 if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY) 850 return (0); 851 852 if (ifp->if_flags & IFF_POINTOPOINT && 853 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 854 return (0); 855 856 /* 857 * add a loopback route to self 858 */ 859 if (V_useloopback && !vhid && !(ifp->if_flags & IFF_LOOPBACK)) { 860 struct route ia_ro; 861 862 bzero(&ia_ro, sizeof(ia_ro)); 863 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = ia->ia_addr; 864 rtalloc_ign_fib(&ia_ro, 0, RT_DEFAULT_FIB); 865 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) && 866 (ia_ro.ro_rt->rt_ifp == V_loif)) { 867 RT_LOCK(ia_ro.ro_rt); 868 RT_ADDREF(ia_ro.ro_rt); 869 RTFREE_LOCKED(ia_ro.ro_rt); 870 } else 871 error = ifa_add_loopback_route((struct ifaddr *)ia, 872 (struct sockaddr *)&ia->ia_addr); 873 if (error == 0) 874 ia->ia_flags |= IFA_RTSELF; 875 if (ia_ro.ro_rt != NULL) 876 RTFREE(ia_ro.ro_rt); 877 } 878 879 return (error); 880 } 881 882 #define rtinitflags(x) \ 883 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 884 ? RTF_HOST : 0) 885 886 /* 887 * Generate a routing message when inserting or deleting 888 * an interface address alias. 889 */ 890 static void in_addralias_rtmsg(int cmd, struct in_addr *prefix, 891 struct in_ifaddr *target) 892 { 893 struct route pfx_ro; 894 struct sockaddr_in *pfx_addr; 895 struct rtentry msg_rt; 896 897 /* QL: XXX 898 * This is a bit questionable because there is no 899 * additional route entry added/deleted for an address 900 * alias. Therefore this route report is inaccurate. 901 */ 902 bzero(&pfx_ro, sizeof(pfx_ro)); 903 pfx_addr = (struct sockaddr_in *)(&pfx_ro.ro_dst); 904 pfx_addr->sin_len = sizeof(*pfx_addr); 905 pfx_addr->sin_family = AF_INET; 906 pfx_addr->sin_addr = *prefix; 907 rtalloc_ign_fib(&pfx_ro, 0, 0); 908 if (pfx_ro.ro_rt != NULL) { 909 msg_rt = *pfx_ro.ro_rt; 910 911 /* QL: XXX 912 * Point the gateway to the new interface 913 * address as if a new prefix route entry has 914 * been added through the new address alias. 915 * All other parts of the rtentry is accurate, 916 * e.g., rt_key, rt_mask, rt_ifp etc. 917 */ 918 msg_rt.rt_gateway = (struct sockaddr *)&target->ia_addr; 919 rt_newaddrmsg(cmd, (struct ifaddr *)target, 0, &msg_rt); 920 RTFREE(pfx_ro.ro_rt); 921 } 922 return; 923 } 924 925 /* 926 * Check if we have a route for the given prefix already or add one accordingly. 927 */ 928 int 929 in_addprefix(struct in_ifaddr *target, int flags) 930 { 931 struct in_ifaddr *ia; 932 struct in_addr prefix, mask, p, m; 933 int error; 934 935 if ((flags & RTF_HOST) != 0) { 936 prefix = target->ia_dstaddr.sin_addr; 937 mask.s_addr = 0; 938 } else { 939 prefix = target->ia_addr.sin_addr; 940 mask = target->ia_sockmask.sin_addr; 941 prefix.s_addr &= mask.s_addr; 942 } 943 944 IN_IFADDR_RLOCK(); 945 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 946 if (rtinitflags(ia)) { 947 p = ia->ia_dstaddr.sin_addr; 948 949 if (prefix.s_addr != p.s_addr) 950 continue; 951 } else { 952 p = ia->ia_addr.sin_addr; 953 m = ia->ia_sockmask.sin_addr; 954 p.s_addr &= m.s_addr; 955 956 if (prefix.s_addr != p.s_addr || 957 mask.s_addr != m.s_addr) 958 continue; 959 } 960 961 /* 962 * If we got a matching prefix route inserted by other 963 * interface address, we are done here. 964 */ 965 if (ia->ia_flags & IFA_ROUTE) { 966 #ifdef RADIX_MPATH 967 if (ia->ia_addr.sin_addr.s_addr == 968 target->ia_addr.sin_addr.s_addr) { 969 IN_IFADDR_RUNLOCK(); 970 return (EEXIST); 971 } else 972 break; 973 #endif 974 if (V_nosameprefix) { 975 IN_IFADDR_RUNLOCK(); 976 return (EEXIST); 977 } else { 978 in_addralias_rtmsg(RTM_ADD, &prefix, target); 979 IN_IFADDR_RUNLOCK(); 980 return (0); 981 } 982 } 983 } 984 IN_IFADDR_RUNLOCK(); 985 986 /* 987 * No-one seem to have this prefix route, so we try to insert it. 988 */ 989 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 990 if (!error) 991 target->ia_flags |= IFA_ROUTE; 992 return (error); 993 } 994 995 /* 996 * If there is no other address in the system that can serve a route to the 997 * same prefix, remove the route. Hand over the route to the new address 998 * otherwise. 999 */ 1000 int 1001 in_scrubprefix(struct in_ifaddr *target, u_int flags) 1002 { 1003 struct in_ifaddr *ia; 1004 struct in_addr prefix, mask, p, m; 1005 int error = 0; 1006 struct sockaddr_in prefix0, mask0; 1007 1008 /* 1009 * Remove the loopback route to the interface address. 1010 * The "useloopback" setting is not consulted because if the 1011 * user configures an interface address, turns off this 1012 * setting, and then tries to delete that interface address, 1013 * checking the current setting of "useloopback" would leave 1014 * that interface address loopback route untouched, which 1015 * would be wrong. Therefore the interface address loopback route 1016 * deletion is unconditional. 1017 */ 1018 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) && 1019 !(target->ia_ifp->if_flags & IFF_LOOPBACK) && 1020 (target->ia_flags & IFA_RTSELF)) { 1021 struct route ia_ro; 1022 int freeit = 0; 1023 1024 bzero(&ia_ro, sizeof(ia_ro)); 1025 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = target->ia_addr; 1026 rtalloc_ign_fib(&ia_ro, 0, 0); 1027 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) && 1028 (ia_ro.ro_rt->rt_ifp == V_loif)) { 1029 RT_LOCK(ia_ro.ro_rt); 1030 if (ia_ro.ro_rt->rt_refcnt <= 1) 1031 freeit = 1; 1032 else if (flags & LLE_STATIC) { 1033 RT_REMREF(ia_ro.ro_rt); 1034 target->ia_flags &= ~IFA_RTSELF; 1035 } 1036 RTFREE_LOCKED(ia_ro.ro_rt); 1037 } 1038 if (freeit && (flags & LLE_STATIC)) { 1039 error = ifa_del_loopback_route((struct ifaddr *)target, 1040 (struct sockaddr *)&target->ia_addr); 1041 if (error == 0) 1042 target->ia_flags &= ~IFA_RTSELF; 1043 } 1044 if ((flags & LLE_STATIC) && 1045 !(target->ia_ifp->if_flags & IFF_NOARP)) 1046 /* remove arp cache */ 1047 arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr); 1048 } 1049 1050 if (rtinitflags(target)) { 1051 prefix = target->ia_dstaddr.sin_addr; 1052 mask.s_addr = 0; 1053 } else { 1054 prefix = target->ia_addr.sin_addr; 1055 mask = target->ia_sockmask.sin_addr; 1056 prefix.s_addr &= mask.s_addr; 1057 } 1058 1059 if ((target->ia_flags & IFA_ROUTE) == 0) { 1060 in_addralias_rtmsg(RTM_DELETE, &prefix, target); 1061 return (0); 1062 } 1063 1064 IN_IFADDR_RLOCK(); 1065 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1066 if (rtinitflags(ia)) { 1067 p = ia->ia_dstaddr.sin_addr; 1068 1069 if (prefix.s_addr != p.s_addr) 1070 continue; 1071 } else { 1072 p = ia->ia_addr.sin_addr; 1073 m = ia->ia_sockmask.sin_addr; 1074 p.s_addr &= m.s_addr; 1075 1076 if (prefix.s_addr != p.s_addr || 1077 mask.s_addr != m.s_addr) 1078 continue; 1079 } 1080 1081 if ((ia->ia_ifp->if_flags & IFF_UP) == 0) 1082 continue; 1083 1084 /* 1085 * If we got a matching prefix address, move IFA_ROUTE and 1086 * the route itself to it. Make sure that routing daemons 1087 * get a heads-up. 1088 */ 1089 if ((ia->ia_flags & IFA_ROUTE) == 0) { 1090 ifa_ref(&ia->ia_ifa); 1091 IN_IFADDR_RUNLOCK(); 1092 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, 1093 rtinitflags(target)); 1094 if (error == 0) 1095 target->ia_flags &= ~IFA_ROUTE; 1096 else 1097 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n", 1098 error); 1099 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 1100 rtinitflags(ia) | RTF_UP); 1101 if (error == 0) 1102 ia->ia_flags |= IFA_ROUTE; 1103 else 1104 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n", 1105 error); 1106 ifa_free(&ia->ia_ifa); 1107 return (error); 1108 } 1109 } 1110 IN_IFADDR_RUNLOCK(); 1111 1112 /* 1113 * remove all L2 entries on the given prefix 1114 */ 1115 bzero(&prefix0, sizeof(prefix0)); 1116 prefix0.sin_len = sizeof(prefix0); 1117 prefix0.sin_family = AF_INET; 1118 prefix0.sin_addr.s_addr = target->ia_subnet; 1119 bzero(&mask0, sizeof(mask0)); 1120 mask0.sin_len = sizeof(mask0); 1121 mask0.sin_family = AF_INET; 1122 mask0.sin_addr.s_addr = target->ia_subnetmask; 1123 lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0, 1124 (struct sockaddr *)&mask0, flags); 1125 1126 /* 1127 * As no-one seem to have this prefix, we can remove the route. 1128 */ 1129 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 1130 if (error == 0) 1131 target->ia_flags &= ~IFA_ROUTE; 1132 else 1133 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error); 1134 return (error); 1135 } 1136 1137 #undef rtinitflags 1138 1139 /* 1140 * Return 1 if the address might be a local broadcast address. 1141 */ 1142 int 1143 in_broadcast(struct in_addr in, struct ifnet *ifp) 1144 { 1145 register struct ifaddr *ifa; 1146 u_long t; 1147 1148 if (in.s_addr == INADDR_BROADCAST || 1149 in.s_addr == INADDR_ANY) 1150 return (1); 1151 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1152 return (0); 1153 t = ntohl(in.s_addr); 1154 /* 1155 * Look through the list of addresses for a match 1156 * with a broadcast address. 1157 */ 1158 #define ia ((struct in_ifaddr *)ifa) 1159 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1160 if (ifa->ifa_addr->sa_family == AF_INET && 1161 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1162 /* 1163 * Check for old-style (host 0) broadcast, but 1164 * taking into account that RFC 3021 obsoletes it. 1165 */ 1166 (ia->ia_subnetmask != IN_RFC3021_MASK && 1167 t == ia->ia_subnet)) && 1168 /* 1169 * Check for an all one subnetmask. These 1170 * only exist when an interface gets a secondary 1171 * address. 1172 */ 1173 ia->ia_subnetmask != (u_long)0xffffffff) 1174 return (1); 1175 return (0); 1176 #undef ia 1177 } 1178 1179 /* 1180 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 1181 */ 1182 void 1183 in_ifdetach(struct ifnet *ifp) 1184 { 1185 1186 in_pcbpurgeif0(&V_ripcbinfo, ifp); 1187 in_pcbpurgeif0(&V_udbinfo, ifp); 1188 in_purgemaddrs(ifp); 1189 } 1190 1191 /* 1192 * Delete all IPv4 multicast address records, and associated link-layer 1193 * multicast address records, associated with ifp. 1194 * XXX It looks like domifdetach runs AFTER the link layer cleanup. 1195 * XXX This should not race with ifma_protospec being set during 1196 * a new allocation, if it does, we have bigger problems. 1197 */ 1198 static void 1199 in_purgemaddrs(struct ifnet *ifp) 1200 { 1201 LIST_HEAD(,in_multi) purgeinms; 1202 struct in_multi *inm, *tinm; 1203 struct ifmultiaddr *ifma; 1204 1205 LIST_INIT(&purgeinms); 1206 IN_MULTI_LOCK(); 1207 1208 /* 1209 * Extract list of in_multi associated with the detaching ifp 1210 * which the PF_INET layer is about to release. 1211 * We need to do this as IF_ADDR_LOCK() may be re-acquired 1212 * by code further down. 1213 */ 1214 IF_ADDR_RLOCK(ifp); 1215 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1216 if (ifma->ifma_addr->sa_family != AF_INET || 1217 ifma->ifma_protospec == NULL) 1218 continue; 1219 #if 0 1220 KASSERT(ifma->ifma_protospec != NULL, 1221 ("%s: ifma_protospec is NULL", __func__)); 1222 #endif 1223 inm = (struct in_multi *)ifma->ifma_protospec; 1224 LIST_INSERT_HEAD(&purgeinms, inm, inm_link); 1225 } 1226 IF_ADDR_RUNLOCK(ifp); 1227 1228 LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) { 1229 LIST_REMOVE(inm, inm_link); 1230 inm_release_locked(inm); 1231 } 1232 igmp_ifdetach(ifp); 1233 1234 IN_MULTI_UNLOCK(); 1235 } 1236 1237 struct in_llentry { 1238 struct llentry base; 1239 struct sockaddr_in l3_addr4; 1240 }; 1241 1242 /* 1243 * Deletes an address from the address table. 1244 * This function is called by the timer functions 1245 * such as arptimer() and nd6_llinfo_timer(), and 1246 * the caller does the locking. 1247 */ 1248 static void 1249 in_lltable_free(struct lltable *llt, struct llentry *lle) 1250 { 1251 LLE_WUNLOCK(lle); 1252 LLE_LOCK_DESTROY(lle); 1253 free(lle, M_LLTABLE); 1254 } 1255 1256 static struct llentry * 1257 in_lltable_new(const struct sockaddr *l3addr, u_int flags) 1258 { 1259 struct in_llentry *lle; 1260 1261 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 1262 if (lle == NULL) /* NB: caller generates msg */ 1263 return NULL; 1264 1265 /* 1266 * For IPv4 this will trigger "arpresolve" to generate 1267 * an ARP request. 1268 */ 1269 lle->base.la_expire = time_uptime; /* mark expired */ 1270 lle->l3_addr4 = *(const struct sockaddr_in *)l3addr; 1271 lle->base.lle_refcnt = 1; 1272 lle->base.lle_free = in_lltable_free; 1273 LLE_LOCK_INIT(&lle->base); 1274 callout_init_rw(&lle->base.la_timer, &lle->base.lle_lock, 1275 CALLOUT_RETURNUNLOCKED); 1276 1277 return (&lle->base); 1278 } 1279 1280 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 1281 (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 ) 1282 1283 static void 1284 in_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix, 1285 const struct sockaddr *mask, u_int flags) 1286 { 1287 const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix; 1288 const struct sockaddr_in *msk = (const struct sockaddr_in *)mask; 1289 struct llentry *lle, *next; 1290 int i; 1291 size_t pkts_dropped; 1292 1293 IF_AFDATA_WLOCK(llt->llt_ifp); 1294 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1295 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 1296 /* 1297 * (flags & LLE_STATIC) means deleting all entries 1298 * including static ARP entries. 1299 */ 1300 if (IN_ARE_MASKED_ADDR_EQUAL(satosin(L3_ADDR(lle)), 1301 pfx, msk) && ((flags & LLE_STATIC) || 1302 !(lle->la_flags & LLE_STATIC))) { 1303 LLE_WLOCK(lle); 1304 if (callout_stop(&lle->la_timer)) 1305 LLE_REMREF(lle); 1306 pkts_dropped = llentry_free(lle); 1307 ARPSTAT_ADD(dropped, pkts_dropped); 1308 } 1309 } 1310 } 1311 IF_AFDATA_WUNLOCK(llt->llt_ifp); 1312 } 1313 1314 1315 static int 1316 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr) 1317 { 1318 struct rtentry *rt; 1319 1320 KASSERT(l3addr->sa_family == AF_INET, 1321 ("sin_family %d", l3addr->sa_family)); 1322 1323 /* XXX rtalloc1 should take a const param */ 1324 rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0); 1325 1326 if (rt == NULL) 1327 return (EINVAL); 1328 1329 /* 1330 * If the gateway for an existing host route matches the target L3 1331 * address, which is a special route inserted by some implementation 1332 * such as MANET, and the interface is of the correct type, then 1333 * allow for ARP to proceed. 1334 */ 1335 if (rt->rt_flags & RTF_GATEWAY) { 1336 if (!(rt->rt_flags & RTF_HOST) || !rt->rt_ifp || 1337 rt->rt_ifp->if_type != IFT_ETHER || 1338 (rt->rt_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 || 1339 memcmp(rt->rt_gateway->sa_data, l3addr->sa_data, 1340 sizeof(in_addr_t)) != 0) { 1341 RTFREE_LOCKED(rt); 1342 return (EINVAL); 1343 } 1344 } 1345 1346 /* 1347 * Make sure that at least the destination address is covered 1348 * by the route. This is for handling the case where 2 or more 1349 * interfaces have the same prefix. An incoming packet arrives 1350 * on one interface and the corresponding outgoing packet leaves 1351 * another interface. 1352 */ 1353 if (!(rt->rt_flags & RTF_HOST) && rt->rt_ifp != ifp) { 1354 const char *sa, *mask, *addr, *lim; 1355 int len; 1356 1357 mask = (const char *)rt_mask(rt); 1358 /* 1359 * Just being extra cautious to avoid some custom 1360 * code getting into trouble. 1361 */ 1362 if (mask == NULL) { 1363 RTFREE_LOCKED(rt); 1364 return (EINVAL); 1365 } 1366 1367 sa = (const char *)rt_key(rt); 1368 addr = (const char *)l3addr; 1369 len = ((const struct sockaddr_in *)l3addr)->sin_len; 1370 lim = addr + len; 1371 1372 for ( ; addr < lim; sa++, mask++, addr++) { 1373 if ((*sa ^ *addr) & *mask) { 1374 #ifdef DIAGNOSTIC 1375 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n", 1376 inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr)); 1377 #endif 1378 RTFREE_LOCKED(rt); 1379 return (EINVAL); 1380 } 1381 } 1382 } 1383 1384 RTFREE_LOCKED(rt); 1385 return (0); 1386 } 1387 1388 /* 1389 * Return NULL if not found or marked for deletion. 1390 * If found return lle read locked. 1391 */ 1392 static struct llentry * 1393 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1394 { 1395 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1396 struct ifnet *ifp = llt->llt_ifp; 1397 struct llentry *lle; 1398 struct llentries *lleh; 1399 u_int hashkey; 1400 1401 IF_AFDATA_LOCK_ASSERT(ifp); 1402 KASSERT(l3addr->sa_family == AF_INET, 1403 ("sin_family %d", l3addr->sa_family)); 1404 1405 hashkey = sin->sin_addr.s_addr; 1406 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 1407 LIST_FOREACH(lle, lleh, lle_next) { 1408 struct sockaddr_in *sa2 = satosin(L3_ADDR(lle)); 1409 if (lle->la_flags & LLE_DELETED) 1410 continue; 1411 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr) 1412 break; 1413 } 1414 if (lle == NULL) { 1415 #ifdef DIAGNOSTIC 1416 if (flags & LLE_DELETE) 1417 log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle); 1418 #endif 1419 if (!(flags & LLE_CREATE)) 1420 return (NULL); 1421 /* 1422 * A route that covers the given address must have 1423 * been installed 1st because we are doing a resolution, 1424 * verify this. 1425 */ 1426 if (!(flags & LLE_IFADDR) && 1427 in_lltable_rtcheck(ifp, flags, l3addr) != 0) 1428 goto done; 1429 1430 lle = in_lltable_new(l3addr, flags); 1431 if (lle == NULL) { 1432 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 1433 goto done; 1434 } 1435 lle->la_flags = flags & ~LLE_CREATE; 1436 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 1437 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 1438 lle->la_flags |= (LLE_VALID | LLE_STATIC); 1439 } 1440 1441 lle->lle_tbl = llt; 1442 lle->lle_head = lleh; 1443 lle->la_flags |= LLE_LINKED; 1444 LIST_INSERT_HEAD(lleh, lle, lle_next); 1445 } else if (flags & LLE_DELETE) { 1446 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 1447 LLE_WLOCK(lle); 1448 lle->la_flags |= LLE_DELETED; 1449 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 1450 #ifdef DIAGNOSTIC 1451 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 1452 #endif 1453 if ((lle->la_flags & 1454 (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC) 1455 llentry_free(lle); 1456 else 1457 LLE_WUNLOCK(lle); 1458 } 1459 lle = (void *)-1; 1460 1461 } 1462 if (LLE_IS_VALID(lle)) { 1463 if (flags & LLE_EXCLUSIVE) 1464 LLE_WLOCK(lle); 1465 else 1466 LLE_RLOCK(lle); 1467 } 1468 done: 1469 return (lle); 1470 } 1471 1472 static int 1473 in_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 1474 { 1475 #define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle)) 1476 struct ifnet *ifp = llt->llt_ifp; 1477 struct llentry *lle; 1478 /* XXX stack use */ 1479 struct { 1480 struct rt_msghdr rtm; 1481 struct sockaddr_in sin; 1482 struct sockaddr_dl sdl; 1483 } arpc; 1484 int error, i; 1485 1486 LLTABLE_LOCK_ASSERT(); 1487 1488 error = 0; 1489 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1490 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 1491 struct sockaddr_dl *sdl; 1492 1493 /* skip deleted entries */ 1494 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 1495 continue; 1496 /* Skip if jailed and not a valid IP of the prison. */ 1497 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 1498 continue; 1499 /* 1500 * produce a msg made of: 1501 * struct rt_msghdr; 1502 * struct sockaddr_in; (IPv4) 1503 * struct sockaddr_dl; 1504 */ 1505 bzero(&arpc, sizeof(arpc)); 1506 arpc.rtm.rtm_msglen = sizeof(arpc); 1507 arpc.rtm.rtm_version = RTM_VERSION; 1508 arpc.rtm.rtm_type = RTM_GET; 1509 arpc.rtm.rtm_flags = RTF_UP; 1510 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1511 arpc.sin.sin_family = AF_INET; 1512 arpc.sin.sin_len = sizeof(arpc.sin); 1513 arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr; 1514 1515 /* publish */ 1516 if (lle->la_flags & LLE_PUB) 1517 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1518 1519 sdl = &arpc.sdl; 1520 sdl->sdl_family = AF_LINK; 1521 sdl->sdl_len = sizeof(*sdl); 1522 sdl->sdl_index = ifp->if_index; 1523 sdl->sdl_type = ifp->if_type; 1524 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 1525 sdl->sdl_alen = ifp->if_addrlen; 1526 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1527 } else { 1528 sdl->sdl_alen = 0; 1529 bzero(LLADDR(sdl), ifp->if_addrlen); 1530 } 1531 1532 arpc.rtm.rtm_rmx.rmx_expire = 1533 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1534 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1535 if (lle->la_flags & LLE_STATIC) 1536 arpc.rtm.rtm_flags |= RTF_STATIC; 1537 arpc.rtm.rtm_index = ifp->if_index; 1538 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1539 if (error) 1540 break; 1541 } 1542 } 1543 return error; 1544 #undef SIN 1545 } 1546 1547 void * 1548 in_domifattach(struct ifnet *ifp) 1549 { 1550 struct in_ifinfo *ii; 1551 struct lltable *llt; 1552 1553 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); 1554 1555 llt = lltable_init(ifp, AF_INET); 1556 if (llt != NULL) { 1557 llt->llt_prefix_free = in_lltable_prefix_free; 1558 llt->llt_lookup = in_lltable_lookup; 1559 llt->llt_dump = in_lltable_dump; 1560 } 1561 ii->ii_llt = llt; 1562 1563 ii->ii_igmp = igmp_domifattach(ifp); 1564 1565 return ii; 1566 } 1567 1568 void 1569 in_domifdetach(struct ifnet *ifp, void *aux) 1570 { 1571 struct in_ifinfo *ii = (struct in_ifinfo *)aux; 1572 1573 igmp_domifdetach(ifp); 1574 lltable_free(ii->ii_llt); 1575 free(ii, M_IFADDR); 1576 } 1577