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_carp.h" 37 #include "opt_route.h" 38 39 #include <sys/param.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 #include <sys/vimage.h> 51 52 #include <net/if.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/vinet.h> 64 #include <netinet/igmp_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 #ifdef VIMAGE_GLOBALS 79 static int subnetsarelocal; 80 static int sameprefixcarponly; 81 extern struct inpcbinfo ripcbinfo; 82 #endif 83 84 SYSCTL_V_INT(V_NET, vnet_inet, _net_inet_ip, OID_AUTO, subnets_are_local, 85 CTLFLAG_RW, subnetsarelocal, 0, 86 "Treat all subnets as directly connected"); 87 SYSCTL_V_INT(V_NET, vnet_inet, _net_inet_ip, OID_AUTO, same_prefix_carp_only, 88 CTLFLAG_RW, sameprefixcarponly, 0, 89 "Refuse to create same prefixes on different interfaces"); 90 91 /* 92 * Return 1 if an internet address is for a ``local'' host 93 * (one to which we have a connection). If subnetsarelocal 94 * is true, this includes other subnets of the local net. 95 * Otherwise, it includes only the directly-connected (sub)nets. 96 */ 97 int 98 in_localaddr(struct in_addr in) 99 { 100 INIT_VNET_INET(curvnet); 101 register u_long i = ntohl(in.s_addr); 102 register struct in_ifaddr *ia; 103 104 if (V_subnetsarelocal) { 105 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) 106 if ((i & ia->ia_netmask) == ia->ia_net) 107 return (1); 108 } else { 109 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) 110 if ((i & ia->ia_subnetmask) == ia->ia_subnet) 111 return (1); 112 } 113 return (0); 114 } 115 116 /* 117 * Return 1 if an internet address is for the local host and configured 118 * on one of its interfaces. 119 */ 120 int 121 in_localip(struct in_addr in) 122 { 123 INIT_VNET_INET(curvnet); 124 struct in_ifaddr *ia; 125 126 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { 127 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) 128 return (1); 129 } 130 return (0); 131 } 132 133 /* 134 * Determine whether an IP address is in a reserved set of addresses 135 * that may not be forwarded, or whether datagrams to that destination 136 * may be forwarded. 137 */ 138 int 139 in_canforward(struct in_addr in) 140 { 141 register u_long i = ntohl(in.s_addr); 142 register u_long net; 143 144 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i)) 145 return (0); 146 if (IN_CLASSA(i)) { 147 net = i & IN_CLASSA_NET; 148 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 149 return (0); 150 } 151 return (1); 152 } 153 154 /* 155 * Trim a mask in a sockaddr 156 */ 157 static void 158 in_socktrim(struct sockaddr_in *ap) 159 { 160 register char *cplim = (char *) &ap->sin_addr; 161 register char *cp = (char *) (&ap->sin_addr + 1); 162 163 ap->sin_len = 0; 164 while (--cp >= cplim) 165 if (*cp) { 166 (ap)->sin_len = cp - (char *) (ap) + 1; 167 break; 168 } 169 } 170 171 static int 172 in_mask2len(mask) 173 struct in_addr *mask; 174 { 175 int x, y; 176 u_char *p; 177 178 p = (u_char *)mask; 179 for (x = 0; x < sizeof(*mask); x++) { 180 if (p[x] != 0xff) 181 break; 182 } 183 y = 0; 184 if (x < sizeof(*mask)) { 185 for (y = 0; y < 8; y++) { 186 if ((p[x] & (0x80 >> y)) == 0) 187 break; 188 } 189 } 190 return (x * 8 + y); 191 } 192 193 static void 194 in_len2mask(struct in_addr *mask, int len) 195 { 196 int i; 197 u_char *p; 198 199 p = (u_char *)mask; 200 bzero(mask, sizeof(*mask)); 201 for (i = 0; i < len / 8; i++) 202 p[i] = 0xff; 203 if (len % 8) 204 p[i] = (0xff00 >> (len % 8)) & 0xff; 205 } 206 207 /* 208 * Generic internet control operations (ioctl's). 209 * 210 * ifp is NULL if not an interface-specific ioctl. 211 */ 212 /* ARGSUSED */ 213 int 214 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 215 struct thread *td) 216 { 217 INIT_VNET_INET(curvnet); /* both so and ifp can be NULL here! */ 218 register struct ifreq *ifr = (struct ifreq *)data; 219 register struct in_ifaddr *ia, *iap; 220 register struct ifaddr *ifa; 221 struct in_addr allhosts_addr; 222 struct in_addr dst; 223 struct in_ifaddr *oia; 224 struct in_ifinfo *ii; 225 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 226 struct sockaddr_in oldaddr; 227 int error, hostIsNew, iaIsNew, maskIsNew, s; 228 int iaIsFirst; 229 230 ia = NULL; 231 iaIsFirst = 0; 232 iaIsNew = 0; 233 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 234 235 /* 236 * Filter out ioctls we implement directly; forward the rest on to 237 * in_lifaddr_ioctl() and ifp->if_ioctl(). 238 */ 239 switch (cmd) { 240 case SIOCAIFADDR: 241 case SIOCDIFADDR: 242 case SIOCGIFADDR: 243 case SIOCGIFBRDADDR: 244 case SIOCGIFDSTADDR: 245 case SIOCGIFNETMASK: 246 case SIOCSIFADDR: 247 case SIOCSIFBRDADDR: 248 case SIOCSIFDSTADDR: 249 case SIOCSIFNETMASK: 250 break; 251 252 case SIOCALIFADDR: 253 if (td != NULL) { 254 error = priv_check(td, PRIV_NET_ADDIFADDR); 255 if (error) 256 return (error); 257 } 258 if (ifp == NULL) 259 return (EINVAL); 260 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 261 262 case SIOCDLIFADDR: 263 if (td != NULL) { 264 error = priv_check(td, PRIV_NET_DELIFADDR); 265 if (error) 266 return (error); 267 } 268 if (ifp == NULL) 269 return (EINVAL); 270 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 271 272 case SIOCGLIFADDR: 273 if (ifp == NULL) 274 return (EINVAL); 275 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 276 277 default: 278 if (ifp == NULL || ifp->if_ioctl == NULL) 279 return (EOPNOTSUPP); 280 return ((*ifp->if_ioctl)(ifp, cmd, data)); 281 } 282 283 if (ifp == NULL) 284 return (EADDRNOTAVAIL); 285 286 /* 287 * Security checks before we get involved in any work. 288 */ 289 switch (cmd) { 290 case SIOCAIFADDR: 291 case SIOCSIFADDR: 292 case SIOCSIFBRDADDR: 293 case SIOCSIFNETMASK: 294 case SIOCSIFDSTADDR: 295 if (td != NULL) { 296 error = priv_check(td, PRIV_NET_ADDIFADDR); 297 if (error) 298 return (error); 299 } 300 break; 301 302 case SIOCDIFADDR: 303 if (td != NULL) { 304 error = priv_check(td, PRIV_NET_DELIFADDR); 305 if (error) 306 return (error); 307 } 308 break; 309 } 310 311 /* 312 * Find address for this interface, if it exists. 313 * 314 * If an alias address was specified, find that one instead of the 315 * first one on the interface, if possible. 316 */ 317 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 318 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) { 319 if (iap->ia_ifp == ifp && 320 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 321 if (td == NULL || prison_check_ip4(td->td_ucred, 322 &dst) == 0) 323 ia = iap; 324 break; 325 } 326 } 327 IF_ADDR_LOCK(ifp); 328 if (ia == NULL) { 329 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 330 iap = ifatoia(ifa); 331 if (iap->ia_addr.sin_family == AF_INET) { 332 if (td != NULL && 333 prison_check_ip4(td->td_ucred, 334 &iap->ia_addr.sin_addr) != 0) 335 continue; 336 ia = iap; 337 break; 338 } 339 } 340 } 341 if (ia == NULL) 342 iaIsFirst = 1; 343 344 error = 0; 345 switch (cmd) { 346 case SIOCAIFADDR: 347 case SIOCDIFADDR: 348 if (ifra->ifra_addr.sin_family == AF_INET) { 349 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 350 if (ia->ia_ifp == ifp && 351 ia->ia_addr.sin_addr.s_addr == 352 ifra->ifra_addr.sin_addr.s_addr) 353 break; 354 } 355 if ((ifp->if_flags & IFF_POINTOPOINT) 356 && (cmd == SIOCAIFADDR) 357 && (ifra->ifra_dstaddr.sin_addr.s_addr 358 == INADDR_ANY)) { 359 error = EDESTADDRREQ; 360 goto out_unlock; 361 } 362 } 363 if (cmd == SIOCDIFADDR && ia == NULL) { 364 error = EADDRNOTAVAIL; 365 goto out_unlock; 366 } 367 /* FALLTHROUGH */ 368 case SIOCSIFADDR: 369 case SIOCSIFNETMASK: 370 case SIOCSIFDSTADDR: 371 if (ia == NULL) { 372 ia = (struct in_ifaddr *) 373 malloc(sizeof *ia, M_IFADDR, M_NOWAIT | 374 M_ZERO); 375 if (ia == NULL) { 376 error = ENOBUFS; 377 goto out_unlock; 378 } 379 380 ifa = &ia->ia_ifa; 381 IFA_LOCK_INIT(ifa); 382 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 383 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 384 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 385 ifa->ifa_refcnt = 1; 386 387 ia->ia_sockmask.sin_len = 8; 388 ia->ia_sockmask.sin_family = AF_INET; 389 if (ifp->if_flags & IFF_BROADCAST) { 390 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 391 ia->ia_broadaddr.sin_family = AF_INET; 392 } 393 ia->ia_ifp = ifp; 394 395 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 396 s = splnet(); 397 TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link); 398 splx(s); 399 iaIsNew = 1; 400 } 401 break; 402 403 case SIOCSIFBRDADDR: 404 case SIOCGIFADDR: 405 case SIOCGIFNETMASK: 406 case SIOCGIFDSTADDR: 407 case SIOCGIFBRDADDR: 408 if (ia == NULL) { 409 error = EADDRNOTAVAIL; 410 goto out_unlock; 411 } 412 break; 413 } 414 415 /* 416 * Most paths in this switch return directly or via out_unlock. Only 417 * paths that remove the address break in order to hit common removal 418 * code. 419 * 420 * XXXRW: We enter the switch with IF_ADDR_LOCK() held, but leave 421 * without it. This is a bug. 422 */ 423 IF_ADDR_LOCK_ASSERT(ifp); 424 switch (cmd) { 425 case SIOCGIFADDR: 426 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 427 goto out_unlock; 428 429 case SIOCGIFBRDADDR: 430 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 431 error = EINVAL; 432 goto out_unlock; 433 } 434 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 435 goto out_unlock; 436 437 case SIOCGIFDSTADDR: 438 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 439 error = EINVAL; 440 goto out_unlock; 441 } 442 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 443 goto out_unlock; 444 445 case SIOCGIFNETMASK: 446 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 447 goto out_unlock; 448 449 case SIOCSIFDSTADDR: 450 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 451 error = EINVAL; 452 goto out_unlock; 453 } 454 oldaddr = ia->ia_dstaddr; 455 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 456 IF_ADDR_UNLOCK(ifp); 457 458 /* 459 * XXXRW: Locks dropped for if_ioctl and rtinit, but ia is 460 * still being used. 461 */ 462 if (ifp->if_ioctl != NULL) { 463 error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, 464 (caddr_t)ia); 465 if (error) { 466 ia->ia_dstaddr = oldaddr; 467 return (error); 468 } 469 } 470 if (ia->ia_flags & IFA_ROUTE) { 471 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 472 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 473 ia->ia_ifa.ifa_dstaddr = 474 (struct sockaddr *)&ia->ia_dstaddr; 475 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 476 } 477 return (0); 478 479 case SIOCSIFBRDADDR: 480 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 481 error = EINVAL; 482 goto out_unlock; 483 } 484 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 485 goto out_unlock; 486 487 case SIOCSIFADDR: 488 IF_ADDR_UNLOCK(ifp); 489 490 /* 491 * XXXRW: Locks dropped for in_ifinit and in_joingroup, but ia 492 * is still being used. 493 */ 494 error = in_ifinit(ifp, ia, 495 (struct sockaddr_in *) &ifr->ifr_addr, 1); 496 if (error != 0 && iaIsNew) 497 break; 498 if (error == 0) { 499 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 500 if (iaIsFirst && 501 (ifp->if_flags & IFF_MULTICAST) != 0) { 502 error = in_joingroup(ifp, &allhosts_addr, 503 NULL, &ii->ii_allhosts); 504 } 505 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 506 } 507 return (0); 508 509 case SIOCSIFNETMASK: 510 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 511 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 512 goto out_unlock; 513 514 case SIOCAIFADDR: 515 maskIsNew = 0; 516 hostIsNew = 1; 517 error = 0; 518 if (ia->ia_addr.sin_family == AF_INET) { 519 if (ifra->ifra_addr.sin_len == 0) { 520 ifra->ifra_addr = ia->ia_addr; 521 hostIsNew = 0; 522 } else if (ifra->ifra_addr.sin_addr.s_addr == 523 ia->ia_addr.sin_addr.s_addr) 524 hostIsNew = 0; 525 } 526 IF_ADDR_UNLOCK(ifp); 527 528 /* 529 * XXXRW: Locks dropped for in_ifscrub and in_ifinit, but ia 530 * is still being used. 531 */ 532 if (ifra->ifra_mask.sin_len) { 533 in_ifscrub(ifp, ia); 534 ia->ia_sockmask = ifra->ifra_mask; 535 ia->ia_sockmask.sin_family = AF_INET; 536 ia->ia_subnetmask = 537 ntohl(ia->ia_sockmask.sin_addr.s_addr); 538 maskIsNew = 1; 539 } 540 if ((ifp->if_flags & IFF_POINTOPOINT) && 541 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 542 in_ifscrub(ifp, ia); 543 ia->ia_dstaddr = ifra->ifra_dstaddr; 544 maskIsNew = 1; /* We lie; but the effect's the same */ 545 } 546 if (ifra->ifra_addr.sin_family == AF_INET && 547 (hostIsNew || maskIsNew)) 548 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 549 if (error != 0 && iaIsNew) 550 break; 551 552 if ((ifp->if_flags & IFF_BROADCAST) && 553 (ifra->ifra_broadaddr.sin_family == AF_INET)) 554 ia->ia_broadaddr = ifra->ifra_broadaddr; 555 if (error == 0) { 556 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 557 if (iaIsFirst && 558 (ifp->if_flags & IFF_MULTICAST) != 0) { 559 error = in_joingroup(ifp, &allhosts_addr, 560 NULL, &ii->ii_allhosts); 561 } 562 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 563 } 564 return (error); 565 566 case SIOCDIFADDR: 567 IF_ADDR_UNLOCK(ifp); 568 569 /* 570 * XXXRW: Locks dropped for in_ifscrub and in_ifadown, but ia 571 * is still being used. 572 * 573 * in_ifscrub kills the interface route. 574 */ 575 in_ifscrub(ifp, ia); 576 577 /* 578 * in_ifadown gets rid of all the rest of 579 * the routes. This is not quite the right 580 * thing to do, but at least if we are running 581 * a routing process they will come back. 582 */ 583 in_ifadown(&ia->ia_ifa, 1); 584 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 585 error = 0; 586 break; 587 588 default: 589 panic("in_control: unsupported ioctl"); 590 } 591 592 /* 593 * XXXRW: In a more ideal world, we would still be holding 594 * IF_ADDR_LOCK here. 595 */ 596 IF_ADDR_LOCK(ifp); 597 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 598 IF_ADDR_UNLOCK(ifp); 599 s = splnet(); 600 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link); 601 if (ia->ia_addr.sin_family == AF_INET) { 602 LIST_REMOVE(ia, ia_hash); 603 /* 604 * If this is the last IPv4 address configured on this 605 * interface, leave the all-hosts group. 606 * No state-change report need be transmitted. 607 */ 608 oia = NULL; 609 IFP_TO_IA(ifp, oia); 610 if (oia == NULL) { 611 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 612 IN_MULTI_LOCK(); 613 if (ii->ii_allhosts) { 614 (void)in_leavegroup_locked(ii->ii_allhosts, 615 NULL); 616 ii->ii_allhosts = NULL; 617 } 618 IN_MULTI_UNLOCK(); 619 } 620 } 621 IFAFREE(&ia->ia_ifa); 622 splx(s); 623 624 return (error); 625 626 out_unlock: 627 IF_ADDR_UNLOCK(ifp); 628 return (error); 629 } 630 631 /* 632 * SIOC[GAD]LIFADDR. 633 * SIOCGLIFADDR: get first address. (?!?) 634 * SIOCGLIFADDR with IFLR_PREFIX: 635 * get first address that matches the specified prefix. 636 * SIOCALIFADDR: add the specified address. 637 * SIOCALIFADDR with IFLR_PREFIX: 638 * EINVAL since we can't deduce hostid part of the address. 639 * SIOCDLIFADDR: delete the specified address. 640 * SIOCDLIFADDR with IFLR_PREFIX: 641 * delete the first address that matches the specified prefix. 642 * return values: 643 * EINVAL on invalid parameters 644 * EADDRNOTAVAIL on prefix match failed/specified address not found 645 * other values may be returned from in_ioctl() 646 */ 647 static int 648 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 649 struct ifnet *ifp, struct thread *td) 650 { 651 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 652 struct ifaddr *ifa; 653 654 /* sanity checks */ 655 if (data == NULL || ifp == NULL) { 656 panic("invalid argument to in_lifaddr_ioctl"); 657 /*NOTRECHED*/ 658 } 659 660 switch (cmd) { 661 case SIOCGLIFADDR: 662 /* address must be specified on GET with IFLR_PREFIX */ 663 if ((iflr->flags & IFLR_PREFIX) == 0) 664 break; 665 /*FALLTHROUGH*/ 666 case SIOCALIFADDR: 667 case SIOCDLIFADDR: 668 /* address must be specified on ADD and DELETE */ 669 if (iflr->addr.ss_family != AF_INET) 670 return (EINVAL); 671 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 672 return (EINVAL); 673 /* XXX need improvement */ 674 if (iflr->dstaddr.ss_family 675 && iflr->dstaddr.ss_family != AF_INET) 676 return (EINVAL); 677 if (iflr->dstaddr.ss_family 678 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 679 return (EINVAL); 680 break; 681 default: /*shouldn't happen*/ 682 return (EOPNOTSUPP); 683 } 684 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 685 return (EINVAL); 686 687 switch (cmd) { 688 case SIOCALIFADDR: 689 { 690 struct in_aliasreq ifra; 691 692 if (iflr->flags & IFLR_PREFIX) 693 return (EINVAL); 694 695 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 696 bzero(&ifra, sizeof(ifra)); 697 bcopy(iflr->iflr_name, ifra.ifra_name, 698 sizeof(ifra.ifra_name)); 699 700 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 701 702 if (iflr->dstaddr.ss_family) { /*XXX*/ 703 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 704 iflr->dstaddr.ss_len); 705 } 706 707 ifra.ifra_mask.sin_family = AF_INET; 708 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 709 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 710 711 return (in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td)); 712 } 713 case SIOCGLIFADDR: 714 case SIOCDLIFADDR: 715 { 716 struct in_ifaddr *ia; 717 struct in_addr mask, candidate, match; 718 struct sockaddr_in *sin; 719 720 bzero(&mask, sizeof(mask)); 721 bzero(&match, sizeof(match)); 722 if (iflr->flags & IFLR_PREFIX) { 723 /* lookup a prefix rather than address. */ 724 in_len2mask(&mask, iflr->prefixlen); 725 726 sin = (struct sockaddr_in *)&iflr->addr; 727 match.s_addr = sin->sin_addr.s_addr; 728 match.s_addr &= mask.s_addr; 729 730 /* if you set extra bits, that's wrong */ 731 if (match.s_addr != sin->sin_addr.s_addr) 732 return (EINVAL); 733 734 } else { 735 /* on getting an address, take the 1st match */ 736 /* on deleting an address, do exact match */ 737 if (cmd != SIOCGLIFADDR) { 738 in_len2mask(&mask, 32); 739 sin = (struct sockaddr_in *)&iflr->addr; 740 match.s_addr = sin->sin_addr.s_addr; 741 } 742 } 743 744 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 745 if (ifa->ifa_addr->sa_family != AF_INET6) 746 continue; 747 if (match.s_addr == 0) 748 break; 749 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 750 candidate.s_addr &= mask.s_addr; 751 if (candidate.s_addr == match.s_addr) 752 break; 753 } 754 if (ifa == NULL) 755 return (EADDRNOTAVAIL); 756 ia = (struct in_ifaddr *)ifa; 757 758 if (cmd == SIOCGLIFADDR) { 759 /* fill in the if_laddrreq structure */ 760 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 761 762 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 763 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 764 ia->ia_dstaddr.sin_len); 765 } else 766 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 767 768 iflr->prefixlen = 769 in_mask2len(&ia->ia_sockmask.sin_addr); 770 771 iflr->flags = 0; /*XXX*/ 772 773 return (0); 774 } else { 775 struct in_aliasreq ifra; 776 777 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 778 bzero(&ifra, sizeof(ifra)); 779 bcopy(iflr->iflr_name, ifra.ifra_name, 780 sizeof(ifra.ifra_name)); 781 782 bcopy(&ia->ia_addr, &ifra.ifra_addr, 783 ia->ia_addr.sin_len); 784 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 785 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 786 ia->ia_dstaddr.sin_len); 787 } 788 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 789 ia->ia_sockmask.sin_len); 790 791 return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 792 ifp, td)); 793 } 794 } 795 } 796 797 return (EOPNOTSUPP); /*just for safety*/ 798 } 799 800 /* 801 * Delete any existing route for an interface. 802 */ 803 void 804 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia) 805 { 806 807 in_scrubprefix(ia); 808 } 809 810 /* 811 * Initialize an interface's internet address 812 * and routing table entry. 813 */ 814 static int 815 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, 816 int scrub) 817 { 818 INIT_VNET_NET(ifp->if_vnet); 819 INIT_VNET_INET(ifp->if_vnet); 820 register u_long i = ntohl(sin->sin_addr.s_addr); 821 struct sockaddr_in oldaddr; 822 struct rtentry *rt = NULL; 823 struct rt_addrinfo info; 824 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 825 int s = splimp(), flags = RTF_UP, error = 0; 826 827 oldaddr = ia->ia_addr; 828 if (oldaddr.sin_family == AF_INET) 829 LIST_REMOVE(ia, ia_hash); 830 ia->ia_addr = *sin; 831 if (ia->ia_addr.sin_family == AF_INET) 832 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 833 ia, ia_hash); 834 /* 835 * Give the interface a chance to initialize 836 * if this is its first address, 837 * and to validate the address if necessary. 838 */ 839 if (ifp->if_ioctl != NULL) { 840 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 841 if (error) { 842 splx(s); 843 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 844 ia->ia_addr = oldaddr; 845 if (ia->ia_addr.sin_family == AF_INET) 846 LIST_INSERT_HEAD(INADDR_HASH( 847 ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 848 else 849 /* 850 * If oldaddr family is not AF_INET (e.g. 851 * interface has been just created) in_control 852 * does not call LIST_REMOVE, and we end up 853 * with bogus ia entries in hash 854 */ 855 LIST_REMOVE(ia, ia_hash); 856 return (error); 857 } 858 } 859 splx(s); 860 if (scrub) { 861 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 862 in_ifscrub(ifp, ia); 863 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 864 } 865 if (IN_CLASSA(i)) 866 ia->ia_netmask = IN_CLASSA_NET; 867 else if (IN_CLASSB(i)) 868 ia->ia_netmask = IN_CLASSB_NET; 869 else 870 ia->ia_netmask = IN_CLASSC_NET; 871 /* 872 * The subnet mask usually includes at least the standard network part, 873 * but may may be smaller in the case of supernetting. 874 * If it is set, we believe it. 875 */ 876 if (ia->ia_subnetmask == 0) { 877 ia->ia_subnetmask = ia->ia_netmask; 878 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 879 } else 880 ia->ia_netmask &= ia->ia_subnetmask; 881 ia->ia_net = i & ia->ia_netmask; 882 ia->ia_subnet = i & ia->ia_subnetmask; 883 in_socktrim(&ia->ia_sockmask); 884 #ifdef DEV_CARP 885 /* 886 * XXX: carp(4) does not have interface route 887 */ 888 if (ifp->if_type == IFT_CARP) 889 return (0); 890 #endif 891 /* 892 * Add route for the network. 893 */ 894 ia->ia_ifa.ifa_metric = ifp->if_metric; 895 if (ifp->if_flags & IFF_BROADCAST) { 896 ia->ia_broadaddr.sin_addr.s_addr = 897 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 898 ia->ia_netbroadcast.s_addr = 899 htonl(ia->ia_net | ~ ia->ia_netmask); 900 } else if (ifp->if_flags & IFF_LOOPBACK) { 901 ia->ia_dstaddr = ia->ia_addr; 902 flags |= RTF_HOST; 903 } else if (ifp->if_flags & IFF_POINTOPOINT) { 904 if (ia->ia_dstaddr.sin_family != AF_INET) 905 return (0); 906 flags |= RTF_HOST; 907 } 908 if ((error = in_addprefix(ia, flags)) != 0) 909 return (error); 910 911 if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY) 912 return (0); 913 914 /* 915 * add a loopback route to self 916 */ 917 if (!(ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) { 918 bzero(&info, sizeof(info)); 919 info.rti_ifp = V_loif; 920 info.rti_flags = ia->ia_flags | RTF_HOST | RTF_STATIC; 921 info.rti_info[RTAX_DST] = (struct sockaddr *)&ia->ia_addr; 922 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 923 error = rtrequest1_fib(RTM_ADD, &info, &rt, 0); 924 925 if (error == 0 && rt != NULL) { 926 RT_LOCK(rt); 927 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 928 rt->rt_ifp->if_type; 929 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 930 rt->rt_ifp->if_index; 931 RT_REMREF(rt); 932 RT_UNLOCK(rt); 933 } else if (error != 0) 934 log(LOG_INFO, "in_ifinit: insertion failed\n"); 935 } 936 937 return (error); 938 } 939 940 #define rtinitflags(x) \ 941 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 942 ? RTF_HOST : 0) 943 /* 944 * Check if we have a route for the given prefix already or add one accordingly. 945 */ 946 static int 947 in_addprefix(struct in_ifaddr *target, int flags) 948 { 949 INIT_VNET_INET(curvnet); 950 struct in_ifaddr *ia; 951 struct in_addr prefix, mask, p, m; 952 int error; 953 954 if ((flags & RTF_HOST) != 0) { 955 prefix = target->ia_dstaddr.sin_addr; 956 mask.s_addr = 0; 957 } else { 958 prefix = target->ia_addr.sin_addr; 959 mask = target->ia_sockmask.sin_addr; 960 prefix.s_addr &= mask.s_addr; 961 } 962 963 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 964 if (rtinitflags(ia)) { 965 p = ia->ia_addr.sin_addr; 966 967 if (prefix.s_addr != p.s_addr) 968 continue; 969 } else { 970 p = ia->ia_addr.sin_addr; 971 m = ia->ia_sockmask.sin_addr; 972 p.s_addr &= m.s_addr; 973 974 if (prefix.s_addr != p.s_addr || 975 mask.s_addr != m.s_addr) 976 continue; 977 } 978 979 /* 980 * If we got a matching prefix route inserted by other 981 * interface address, we are done here. 982 */ 983 if (ia->ia_flags & IFA_ROUTE) { 984 if (V_sameprefixcarponly && 985 target->ia_ifp->if_type != IFT_CARP && 986 ia->ia_ifp->if_type != IFT_CARP) 987 return (EEXIST); 988 else 989 return (0); 990 } 991 } 992 993 /* 994 * No-one seem to have this prefix route, so we try to insert it. 995 */ 996 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 997 if (!error) 998 target->ia_flags |= IFA_ROUTE; 999 return (error); 1000 } 1001 1002 extern void arp_ifscrub(struct ifnet *ifp, uint32_t addr); 1003 1004 /* 1005 * If there is no other address in the system that can serve a route to the 1006 * same prefix, remove the route. Hand over the route to the new address 1007 * otherwise. 1008 */ 1009 static int 1010 in_scrubprefix(struct in_ifaddr *target) 1011 { 1012 INIT_VNET_NET(curvnet); 1013 INIT_VNET_INET(curvnet); 1014 struct in_ifaddr *ia; 1015 struct in_addr prefix, mask, p; 1016 int error; 1017 struct sockaddr_in prefix0, mask0; 1018 struct rt_addrinfo info; 1019 struct sockaddr_dl null_sdl; 1020 1021 if ((target->ia_flags & IFA_ROUTE) == 0) 1022 return (0); 1023 1024 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) && 1025 !(target->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) { 1026 bzero(&null_sdl, sizeof(null_sdl)); 1027 null_sdl.sdl_len = sizeof(null_sdl); 1028 null_sdl.sdl_family = AF_LINK; 1029 null_sdl.sdl_type = V_loif->if_type; 1030 null_sdl.sdl_index = V_loif->if_index; 1031 bzero(&info, sizeof(info)); 1032 info.rti_flags = target->ia_flags | RTF_HOST | RTF_STATIC; 1033 info.rti_info[RTAX_DST] = (struct sockaddr *)&target->ia_addr; 1034 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1035 error = rtrequest1_fib(RTM_DELETE, &info, NULL, 0); 1036 1037 if (error != 0) 1038 log(LOG_INFO, "in_scrubprefix: deletion failed\n"); 1039 } 1040 1041 if (rtinitflags(target)) 1042 prefix = target->ia_dstaddr.sin_addr; 1043 else { 1044 prefix = target->ia_addr.sin_addr; 1045 mask = target->ia_sockmask.sin_addr; 1046 prefix.s_addr &= mask.s_addr; 1047 /* remove arp cache */ 1048 arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr); 1049 } 1050 1051 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1052 if (rtinitflags(ia)) 1053 p = ia->ia_dstaddr.sin_addr; 1054 else { 1055 p = ia->ia_addr.sin_addr; 1056 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1057 } 1058 1059 if (prefix.s_addr != p.s_addr) 1060 continue; 1061 1062 /* 1063 * If we got a matching prefix address, move IFA_ROUTE and 1064 * the route itself to it. Make sure that routing daemons 1065 * get a heads-up. 1066 * 1067 * XXX: a special case for carp(4) interface 1068 */ 1069 if ((ia->ia_flags & IFA_ROUTE) == 0 1070 #ifdef DEV_CARP 1071 && (ia->ia_ifp->if_type != IFT_CARP) 1072 #endif 1073 ) { 1074 rtinit(&(target->ia_ifa), (int)RTM_DELETE, 1075 rtinitflags(target)); 1076 target->ia_flags &= ~IFA_ROUTE; 1077 1078 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 1079 rtinitflags(ia) | RTF_UP); 1080 if (error == 0) 1081 ia->ia_flags |= IFA_ROUTE; 1082 return (error); 1083 } 1084 } 1085 1086 /* 1087 * remove all L2 entries on the given prefix 1088 */ 1089 bzero(&prefix0, sizeof(prefix0)); 1090 prefix0.sin_len = sizeof(prefix0); 1091 prefix0.sin_family = AF_INET; 1092 prefix0.sin_addr.s_addr = target->ia_subnet; 1093 bzero(&mask0, sizeof(mask0)); 1094 mask0.sin_len = sizeof(mask0); 1095 mask0.sin_family = AF_INET; 1096 mask0.sin_addr.s_addr = target->ia_subnetmask; 1097 lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0, 1098 (struct sockaddr *)&mask0); 1099 1100 /* 1101 * As no-one seem to have this prefix, we can remove the route. 1102 */ 1103 rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 1104 target->ia_flags &= ~IFA_ROUTE; 1105 return (0); 1106 } 1107 1108 #undef rtinitflags 1109 1110 /* 1111 * Return 1 if the address might be a local broadcast address. 1112 */ 1113 int 1114 in_broadcast(struct in_addr in, struct ifnet *ifp) 1115 { 1116 register struct ifaddr *ifa; 1117 u_long t; 1118 1119 if (in.s_addr == INADDR_BROADCAST || 1120 in.s_addr == INADDR_ANY) 1121 return (1); 1122 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1123 return (0); 1124 t = ntohl(in.s_addr); 1125 /* 1126 * Look through the list of addresses for a match 1127 * with a broadcast address. 1128 */ 1129 #define ia ((struct in_ifaddr *)ifa) 1130 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1131 if (ifa->ifa_addr->sa_family == AF_INET && 1132 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1133 in.s_addr == ia->ia_netbroadcast.s_addr || 1134 /* 1135 * Check for old-style (host 0) broadcast. 1136 */ 1137 t == ia->ia_subnet || t == ia->ia_net) && 1138 /* 1139 * Check for an all one subnetmask. These 1140 * only exist when an interface gets a secondary 1141 * address. 1142 */ 1143 ia->ia_subnetmask != (u_long)0xffffffff) 1144 return (1); 1145 return (0); 1146 #undef ia 1147 } 1148 1149 /* 1150 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 1151 */ 1152 void 1153 in_ifdetach(struct ifnet *ifp) 1154 { 1155 INIT_VNET_INET(ifp->if_vnet); 1156 1157 in_pcbpurgeif0(&V_ripcbinfo, ifp); 1158 in_pcbpurgeif0(&V_udbinfo, ifp); 1159 in_purgemaddrs(ifp); 1160 } 1161 1162 /* 1163 * Delete all IPv4 multicast address records, and associated link-layer 1164 * multicast address records, associated with ifp. 1165 * XXX It looks like domifdetach runs AFTER the link layer cleanup. 1166 * XXX This should not race with ifma_protospec being set during 1167 * a new allocation, if it does, we have bigger problems. 1168 */ 1169 static void 1170 in_purgemaddrs(struct ifnet *ifp) 1171 { 1172 LIST_HEAD(,in_multi) purgeinms; 1173 struct in_multi *inm, *tinm; 1174 struct ifmultiaddr *ifma; 1175 1176 LIST_INIT(&purgeinms); 1177 IN_MULTI_LOCK(); 1178 1179 /* 1180 * Extract list of in_multi associated with the detaching ifp 1181 * which the PF_INET layer is about to release. 1182 * We need to do this as IF_ADDR_LOCK() may be re-acquired 1183 * by code further down. 1184 */ 1185 IF_ADDR_LOCK(ifp); 1186 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1187 if (ifma->ifma_addr->sa_family != AF_INET || 1188 ifma->ifma_protospec == NULL) 1189 continue; 1190 #if 0 1191 KASSERT(ifma->ifma_protospec != NULL, 1192 ("%s: ifma_protospec is NULL", __func__)); 1193 #endif 1194 inm = (struct in_multi *)ifma->ifma_protospec; 1195 LIST_INSERT_HEAD(&purgeinms, inm, inm_link); 1196 } 1197 IF_ADDR_UNLOCK(ifp); 1198 1199 LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) { 1200 LIST_REMOVE(inm, inm_link); 1201 inm_release_locked(inm); 1202 } 1203 igmp_ifdetach(ifp); 1204 1205 IN_MULTI_UNLOCK(); 1206 } 1207 1208 #include <net/if_dl.h> 1209 #include <netinet/if_ether.h> 1210 1211 struct in_llentry { 1212 struct llentry base; 1213 struct sockaddr_in l3_addr4; 1214 }; 1215 1216 static struct llentry * 1217 in_lltable_new(const struct sockaddr *l3addr, u_int flags) 1218 { 1219 struct in_llentry *lle; 1220 1221 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_DONTWAIT | M_ZERO); 1222 if (lle == NULL) /* NB: caller generates msg */ 1223 return NULL; 1224 1225 callout_init(&lle->base.la_timer, CALLOUT_MPSAFE); 1226 /* 1227 * For IPv4 this will trigger "arpresolve" to generate 1228 * an ARP request. 1229 */ 1230 lle->base.la_expire = time_second; /* mark expired */ 1231 lle->l3_addr4 = *(const struct sockaddr_in *)l3addr; 1232 lle->base.lle_refcnt = 1; 1233 LLE_LOCK_INIT(&lle->base); 1234 return &lle->base; 1235 } 1236 1237 /* 1238 * Deletes an address from the address table. 1239 * This function is called by the timer functions 1240 * such as arptimer() and nd6_llinfo_timer(), and 1241 * the caller does the locking. 1242 */ 1243 static void 1244 in_lltable_free(struct lltable *llt, struct llentry *lle) 1245 { 1246 LLE_WUNLOCK(lle); 1247 LLE_LOCK_DESTROY(lle); 1248 free(lle, M_LLTABLE); 1249 } 1250 1251 1252 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 1253 (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 ) 1254 1255 static void 1256 in_lltable_prefix_free(struct lltable *llt, 1257 const struct sockaddr *prefix, 1258 const struct sockaddr *mask) 1259 { 1260 const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix; 1261 const struct sockaddr_in *msk = (const struct sockaddr_in *)mask; 1262 struct llentry *lle, *next; 1263 register int i; 1264 1265 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) { 1266 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 1267 1268 if (IN_ARE_MASKED_ADDR_EQUAL((struct sockaddr_in *)L3_ADDR(lle), 1269 pfx, msk)) { 1270 callout_drain(&lle->la_timer); 1271 LLE_WLOCK(lle); 1272 llentry_free(lle); 1273 } 1274 } 1275 } 1276 } 1277 1278 1279 static int 1280 in_lltable_rtcheck(struct ifnet *ifp, const struct sockaddr *l3addr) 1281 { 1282 struct rtentry *rt; 1283 1284 KASSERT(l3addr->sa_family == AF_INET, 1285 ("sin_family %d", l3addr->sa_family)); 1286 1287 /* XXX rtalloc1 should take a const param */ 1288 rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0); 1289 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 1290 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n", 1291 inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr)); 1292 if (rt != NULL) 1293 RTFREE_LOCKED(rt); 1294 return (EINVAL); 1295 } 1296 RTFREE_LOCKED(rt); 1297 return 0; 1298 } 1299 1300 /* 1301 * Return NULL if not found or marked for deletion. 1302 * If found return lle read locked. 1303 */ 1304 static struct llentry * 1305 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1306 { 1307 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1308 struct ifnet *ifp = llt->llt_ifp; 1309 struct llentry *lle; 1310 struct llentries *lleh; 1311 u_int hashkey; 1312 1313 IF_AFDATA_LOCK_ASSERT(ifp); 1314 KASSERT(l3addr->sa_family == AF_INET, 1315 ("sin_family %d", l3addr->sa_family)); 1316 1317 hashkey = sin->sin_addr.s_addr; 1318 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 1319 LIST_FOREACH(lle, lleh, lle_next) { 1320 struct sockaddr_in *sa2 = (struct sockaddr_in *)L3_ADDR(lle); 1321 if (lle->la_flags & LLE_DELETED) 1322 continue; 1323 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr) 1324 break; 1325 } 1326 if (lle == NULL) { 1327 #ifdef DIAGNOSTICS 1328 if (flags & LLE_DELETE) 1329 log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle); 1330 #endif 1331 if (!(flags & LLE_CREATE)) 1332 return (NULL); 1333 /* 1334 * A route that covers the given address must have 1335 * been installed 1st because we are doing a resolution, 1336 * verify this. 1337 */ 1338 if (!(flags & LLE_IFADDR) && 1339 in_lltable_rtcheck(ifp, l3addr) != 0) 1340 goto done; 1341 1342 lle = in_lltable_new(l3addr, flags); 1343 if (lle == NULL) { 1344 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 1345 goto done; 1346 } 1347 lle->la_flags = flags & ~LLE_CREATE; 1348 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 1349 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 1350 lle->la_flags |= (LLE_VALID | LLE_STATIC); 1351 } 1352 1353 lle->lle_tbl = llt; 1354 lle->lle_head = lleh; 1355 LIST_INSERT_HEAD(lleh, lle, lle_next); 1356 } else if (flags & LLE_DELETE) { 1357 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 1358 LLE_WLOCK(lle); 1359 lle->la_flags = LLE_DELETED; 1360 LLE_WUNLOCK(lle); 1361 #ifdef DIAGNOSTICS 1362 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 1363 #endif 1364 } 1365 lle = (void *)-1; 1366 1367 } 1368 if (LLE_IS_VALID(lle)) { 1369 if (flags & LLE_EXCLUSIVE) 1370 LLE_WLOCK(lle); 1371 else 1372 LLE_RLOCK(lle); 1373 } 1374 done: 1375 return (lle); 1376 } 1377 1378 static int 1379 in_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 1380 { 1381 #define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle)) 1382 struct ifnet *ifp = llt->llt_ifp; 1383 struct llentry *lle; 1384 /* XXX stack use */ 1385 struct { 1386 struct rt_msghdr rtm; 1387 struct sockaddr_inarp sin; 1388 struct sockaddr_dl sdl; 1389 } arpc; 1390 int error, i; 1391 1392 /* XXXXX 1393 * current IFNET_RLOCK() is mapped to IFNET_WLOCK() 1394 * so it is okay to use this ASSERT, change it when 1395 * IFNET lock is finalized 1396 */ 1397 IFNET_WLOCK_ASSERT(); 1398 1399 error = 0; 1400 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1401 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 1402 struct sockaddr_dl *sdl; 1403 1404 /* skip deleted entries */ 1405 if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID) 1406 continue; 1407 /* Skip if jailed and not a valid IP of the prison. */ 1408 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 1409 continue; 1410 /* 1411 * produce a msg made of: 1412 * struct rt_msghdr; 1413 * struct sockaddr_inarp; (IPv4) 1414 * struct sockaddr_dl; 1415 */ 1416 bzero(&arpc, sizeof(arpc)); 1417 arpc.rtm.rtm_msglen = sizeof(arpc); 1418 arpc.rtm.rtm_version = RTM_VERSION; 1419 arpc.rtm.rtm_type = RTM_GET; 1420 arpc.rtm.rtm_flags = RTF_UP; 1421 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1422 arpc.sin.sin_family = AF_INET; 1423 arpc.sin.sin_len = sizeof(arpc.sin); 1424 arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr; 1425 1426 /* publish */ 1427 if (lle->la_flags & LLE_PUB) { 1428 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1429 /* proxy only */ 1430 if (lle->la_flags & LLE_PROXY) 1431 arpc.sin.sin_other = SIN_PROXY; 1432 } 1433 1434 sdl = &arpc.sdl; 1435 sdl->sdl_family = AF_LINK; 1436 sdl->sdl_len = sizeof(*sdl); 1437 sdl->sdl_alen = ifp->if_addrlen; 1438 sdl->sdl_index = ifp->if_index; 1439 sdl->sdl_type = ifp->if_type; 1440 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1441 1442 arpc.rtm.rtm_rmx.rmx_expire = 1443 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1444 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1445 if (lle->la_flags & LLE_STATIC) 1446 arpc.rtm.rtm_flags |= RTF_STATIC; 1447 arpc.rtm.rtm_index = ifp->if_index; 1448 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1449 if (error) 1450 break; 1451 } 1452 } 1453 return error; 1454 #undef SIN 1455 } 1456 1457 void * 1458 in_domifattach(struct ifnet *ifp) 1459 { 1460 struct in_ifinfo *ii; 1461 struct lltable *llt; 1462 1463 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); 1464 1465 llt = lltable_init(ifp, AF_INET); 1466 if (llt != NULL) { 1467 llt->llt_new = in_lltable_new; 1468 llt->llt_free = in_lltable_free; 1469 llt->llt_prefix_free = in_lltable_prefix_free; 1470 llt->llt_rtcheck = in_lltable_rtcheck; 1471 llt->llt_lookup = in_lltable_lookup; 1472 llt->llt_dump = in_lltable_dump; 1473 } 1474 ii->ii_llt = llt; 1475 1476 ii->ii_igmp = igmp_domifattach(ifp); 1477 1478 return ii; 1479 } 1480 1481 void 1482 in_domifdetach(struct ifnet *ifp, void *aux) 1483 { 1484 struct in_ifinfo *ii = (struct in_ifinfo *)aux; 1485 1486 igmp_domifdetach(ifp); 1487 lltable_free(ii->ii_llt); 1488 free(ii, M_IFADDR); 1489 } 1490