in.c revision 194760
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: head/sys/netinet/in.c 194760 2009-06-23 20:19:09Z rwatson $"); 35 36#include "opt_carp.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#include <sys/vimage.h> 50 51#include <net/if.h> 52#include <net/if_dl.h> 53#include <net/if_llatbl.h> 54#include <net/if_types.h> 55#include <net/route.h> 56#include <net/vnet.h> 57 58#include <netinet/in.h> 59#include <netinet/in_var.h> 60#include <netinet/in_pcb.h> 61#include <netinet/ip_var.h> 62#include <netinet/vinet.h> 63#include <netinet/igmp_var.h> 64 65static int in_mask2len(struct in_addr *); 66static void in_len2mask(struct in_addr *, int); 67static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, 68 struct ifnet *, struct thread *); 69 70static int in_addprefix(struct in_ifaddr *, int); 71static int in_scrubprefix(struct in_ifaddr *); 72static void in_socktrim(struct sockaddr_in *); 73static int in_ifinit(struct ifnet *, 74 struct in_ifaddr *, struct sockaddr_in *, int); 75static void in_purgemaddrs(struct ifnet *); 76 77#ifdef VIMAGE_GLOBALS 78static int subnetsarelocal; 79static int sameprefixcarponly; 80extern struct inpcbinfo ripcbinfo; 81#endif 82 83SYSCTL_V_INT(V_NET, vnet_inet, _net_inet_ip, OID_AUTO, subnets_are_local, 84 CTLFLAG_RW, subnetsarelocal, 0, 85 "Treat all subnets as directly connected"); 86SYSCTL_V_INT(V_NET, vnet_inet, _net_inet_ip, OID_AUTO, same_prefix_carp_only, 87 CTLFLAG_RW, sameprefixcarponly, 0, 88 "Refuse to create same prefixes on different interfaces"); 89 90/* 91 * Return 1 if an internet address is for a ``local'' host 92 * (one to which we have a connection). If subnetsarelocal 93 * is true, this includes other subnets of the local net. 94 * Otherwise, it includes only the directly-connected (sub)nets. 95 */ 96int 97in_localaddr(struct in_addr in) 98{ 99 INIT_VNET_INET(curvnet); 100 register u_long i = ntohl(in.s_addr); 101 register struct in_ifaddr *ia; 102 103 if (V_subnetsarelocal) { 104 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) 105 if ((i & ia->ia_netmask) == ia->ia_net) 106 return (1); 107 } else { 108 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) 109 if ((i & ia->ia_subnetmask) == ia->ia_subnet) 110 return (1); 111 } 112 return (0); 113} 114 115/* 116 * Return 1 if an internet address is for the local host and configured 117 * on one of its interfaces. 118 */ 119int 120in_localip(struct in_addr in) 121{ 122 INIT_VNET_INET(curvnet); 123 struct in_ifaddr *ia; 124 125 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { 126 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) 127 return (1); 128 } 129 return (0); 130} 131 132/* 133 * Determine whether an IP address is in a reserved set of addresses 134 * that may not be forwarded, or whether datagrams to that destination 135 * may be forwarded. 136 */ 137int 138in_canforward(struct in_addr in) 139{ 140 register u_long i = ntohl(in.s_addr); 141 register u_long net; 142 143 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i)) 144 return (0); 145 if (IN_CLASSA(i)) { 146 net = i & IN_CLASSA_NET; 147 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 148 return (0); 149 } 150 return (1); 151} 152 153/* 154 * Trim a mask in a sockaddr 155 */ 156static void 157in_socktrim(struct sockaddr_in *ap) 158{ 159 register char *cplim = (char *) &ap->sin_addr; 160 register char *cp = (char *) (&ap->sin_addr + 1); 161 162 ap->sin_len = 0; 163 while (--cp >= cplim) 164 if (*cp) { 165 (ap)->sin_len = cp - (char *) (ap) + 1; 166 break; 167 } 168} 169 170static int 171in_mask2len(mask) 172 struct in_addr *mask; 173{ 174 int x, y; 175 u_char *p; 176 177 p = (u_char *)mask; 178 for (x = 0; x < sizeof(*mask); x++) { 179 if (p[x] != 0xff) 180 break; 181 } 182 y = 0; 183 if (x < sizeof(*mask)) { 184 for (y = 0; y < 8; y++) { 185 if ((p[x] & (0x80 >> y)) == 0) 186 break; 187 } 188 } 189 return (x * 8 + y); 190} 191 192static void 193in_len2mask(struct in_addr *mask, int len) 194{ 195 int i; 196 u_char *p; 197 198 p = (u_char *)mask; 199 bzero(mask, sizeof(*mask)); 200 for (i = 0; i < len / 8; i++) 201 p[i] = 0xff; 202 if (len % 8) 203 p[i] = (0xff00 >> (len % 8)) & 0xff; 204} 205 206/* 207 * Generic internet control operations (ioctl's). 208 * 209 * ifp is NULL if not an interface-specific ioctl. 210 */ 211/* ARGSUSED */ 212int 213in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 214 struct thread *td) 215{ 216 INIT_VNET_INET(curvnet); /* both so and ifp can be NULL here! */ 217 register struct ifreq *ifr = (struct ifreq *)data; 218 register struct in_ifaddr *ia, *iap; 219 register struct ifaddr *ifa; 220 struct in_addr allhosts_addr; 221 struct in_addr dst; 222 struct in_ifinfo *ii; 223 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 224 struct sockaddr_in oldaddr; 225 int error, hostIsNew, iaIsNew, maskIsNew, s; 226 int iaIsFirst; 227 228 ia = NULL; 229 iaIsFirst = 0; 230 iaIsNew = 0; 231 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 232 233 /* 234 * Filter out ioctls we implement directly; forward the rest on to 235 * in_lifaddr_ioctl() and ifp->if_ioctl(). 236 */ 237 switch (cmd) { 238 case SIOCAIFADDR: 239 case SIOCDIFADDR: 240 case SIOCGIFADDR: 241 case SIOCGIFBRDADDR: 242 case SIOCGIFDSTADDR: 243 case SIOCGIFNETMASK: 244 case SIOCSIFADDR: 245 case SIOCSIFBRDADDR: 246 case SIOCSIFDSTADDR: 247 case SIOCSIFNETMASK: 248 break; 249 250 case SIOCALIFADDR: 251 if (td != NULL) { 252 error = priv_check(td, PRIV_NET_ADDIFADDR); 253 if (error) 254 return (error); 255 } 256 if (ifp == NULL) 257 return (EINVAL); 258 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 259 260 case SIOCDLIFADDR: 261 if (td != NULL) { 262 error = priv_check(td, PRIV_NET_DELIFADDR); 263 if (error) 264 return (error); 265 } 266 if (ifp == NULL) 267 return (EINVAL); 268 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 269 270 case SIOCGLIFADDR: 271 if (ifp == NULL) 272 return (EINVAL); 273 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 274 275 default: 276 if (ifp == NULL || ifp->if_ioctl == NULL) 277 return (EOPNOTSUPP); 278 return ((*ifp->if_ioctl)(ifp, cmd, data)); 279 } 280 281 if (ifp == NULL) 282 return (EADDRNOTAVAIL); 283 284 /* 285 * Security checks before we get involved in any work. 286 */ 287 switch (cmd) { 288 case SIOCAIFADDR: 289 case SIOCSIFADDR: 290 case SIOCSIFBRDADDR: 291 case SIOCSIFNETMASK: 292 case SIOCSIFDSTADDR: 293 if (td != NULL) { 294 error = priv_check(td, PRIV_NET_ADDIFADDR); 295 if (error) 296 return (error); 297 } 298 break; 299 300 case SIOCDIFADDR: 301 if (td != NULL) { 302 error = priv_check(td, PRIV_NET_DELIFADDR); 303 if (error) 304 return (error); 305 } 306 break; 307 } 308 309 /* 310 * Find address for this interface, if it exists. 311 * 312 * If an alias address was specified, find that one instead of the 313 * first one on the interface, if possible. 314 */ 315 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 316 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) { 317 if (iap->ia_ifp == ifp && 318 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 319 if (td == NULL || prison_check_ip4(td->td_ucred, 320 &dst) == 0) 321 ia = iap; 322 break; 323 } 324 } 325 if (ia != NULL) 326 ifa_ref(&ia->ia_ifa); 327 if (ia == NULL) { 328 IF_ADDR_LOCK(ifp); 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 if (ia != NULL) 341 ifa_ref(&ia->ia_ifa); 342 IF_ADDR_UNLOCK(ifp); 343 } 344 if (ia == NULL) 345 iaIsFirst = 1; 346 347 error = 0; 348 switch (cmd) { 349 case SIOCAIFADDR: 350 case SIOCDIFADDR: 351 if (ifra->ifra_addr.sin_family == AF_INET) { 352 struct in_ifaddr *oia; 353 354 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 355 if (ia->ia_ifp == ifp && 356 ia->ia_addr.sin_addr.s_addr == 357 ifra->ifra_addr.sin_addr.s_addr) 358 break; 359 } 360 if (ia != NULL && ia != oia) 361 ifa_ref(&ia->ia_ifa); 362 if (oia != NULL && ia != oia) 363 ifa_free(&oia->ia_ifa); 364 if ((ifp->if_flags & IFF_POINTOPOINT) 365 && (cmd == SIOCAIFADDR) 366 && (ifra->ifra_dstaddr.sin_addr.s_addr 367 == INADDR_ANY)) { 368 error = EDESTADDRREQ; 369 goto out; 370 } 371 } 372 if (cmd == SIOCDIFADDR && ia == NULL) { 373 error = EADDRNOTAVAIL; 374 goto out; 375 } 376 /* FALLTHROUGH */ 377 case SIOCSIFADDR: 378 case SIOCSIFNETMASK: 379 case SIOCSIFDSTADDR: 380 if (ia == NULL) { 381 ia = (struct in_ifaddr *) 382 malloc(sizeof *ia, M_IFADDR, M_NOWAIT | 383 M_ZERO); 384 if (ia == NULL) { 385 error = ENOBUFS; 386 goto out; 387 } 388 389 ifa = &ia->ia_ifa; 390 ifa_init(ifa); 391 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 392 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 393 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 394 395 ia->ia_sockmask.sin_len = 8; 396 ia->ia_sockmask.sin_family = AF_INET; 397 if (ifp->if_flags & IFF_BROADCAST) { 398 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 399 ia->ia_broadaddr.sin_family = AF_INET; 400 } 401 ia->ia_ifp = ifp; 402 403 ifa_ref(ifa); /* if_addrhead */ 404 IF_ADDR_LOCK(ifp); 405 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 406 IF_ADDR_UNLOCK(ifp); 407 ifa_ref(ifa); /* in_ifaddrhead */ 408 s = splnet(); 409 TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link); 410 splx(s); 411 iaIsNew = 1; 412 } 413 break; 414 415 case SIOCSIFBRDADDR: 416 case SIOCGIFADDR: 417 case SIOCGIFNETMASK: 418 case SIOCGIFDSTADDR: 419 case SIOCGIFBRDADDR: 420 if (ia == NULL) { 421 error = EADDRNOTAVAIL; 422 goto out; 423 } 424 break; 425 } 426 427 /* 428 * Most paths in this switch return directly or via out. Only paths 429 * that remove the address break in order to hit common removal code. 430 */ 431 switch (cmd) { 432 case SIOCGIFADDR: 433 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 434 goto out; 435 436 case SIOCGIFBRDADDR: 437 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 438 error = EINVAL; 439 goto out; 440 } 441 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 442 goto out; 443 444 case SIOCGIFDSTADDR: 445 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 446 error = EINVAL; 447 goto out; 448 } 449 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 450 goto out; 451 452 case SIOCGIFNETMASK: 453 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 454 goto out; 455 456 case SIOCSIFDSTADDR: 457 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 458 error = EINVAL; 459 goto out; 460 } 461 oldaddr = ia->ia_dstaddr; 462 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 463 if (ifp->if_ioctl != NULL) { 464 error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, 465 (caddr_t)ia); 466 if (error) { 467 ia->ia_dstaddr = oldaddr; 468 goto out; 469 } 470 } 471 if (ia->ia_flags & IFA_ROUTE) { 472 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 473 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 474 ia->ia_ifa.ifa_dstaddr = 475 (struct sockaddr *)&ia->ia_dstaddr; 476 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 477 } 478 goto out; 479 480 case SIOCSIFBRDADDR: 481 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 482 error = EINVAL; 483 goto out; 484 } 485 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 486 goto out; 487 488 case SIOCSIFADDR: 489 error = in_ifinit(ifp, ia, 490 (struct sockaddr_in *) &ifr->ifr_addr, 1); 491 if (error != 0 && iaIsNew) 492 break; 493 if (error == 0) { 494 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 495 if (iaIsFirst && 496 (ifp->if_flags & IFF_MULTICAST) != 0) { 497 error = in_joingroup(ifp, &allhosts_addr, 498 NULL, &ii->ii_allhosts); 499 } 500 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 501 } 502 error = 0; 503 goto out; 504 505 case SIOCSIFNETMASK: 506 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 507 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 508 goto out; 509 510 case SIOCAIFADDR: 511 maskIsNew = 0; 512 hostIsNew = 1; 513 error = 0; 514 if (ia->ia_addr.sin_family == AF_INET) { 515 if (ifra->ifra_addr.sin_len == 0) { 516 ifra->ifra_addr = ia->ia_addr; 517 hostIsNew = 0; 518 } else if (ifra->ifra_addr.sin_addr.s_addr == 519 ia->ia_addr.sin_addr.s_addr) 520 hostIsNew = 0; 521 } 522 if (ifra->ifra_mask.sin_len) { 523 in_ifscrub(ifp, ia); 524 ia->ia_sockmask = ifra->ifra_mask; 525 ia->ia_sockmask.sin_family = AF_INET; 526 ia->ia_subnetmask = 527 ntohl(ia->ia_sockmask.sin_addr.s_addr); 528 maskIsNew = 1; 529 } 530 if ((ifp->if_flags & IFF_POINTOPOINT) && 531 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 532 in_ifscrub(ifp, ia); 533 ia->ia_dstaddr = ifra->ifra_dstaddr; 534 maskIsNew = 1; /* We lie; but the effect's the same */ 535 } 536 if (ifra->ifra_addr.sin_family == AF_INET && 537 (hostIsNew || maskIsNew)) 538 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 539 if (error != 0 && iaIsNew) 540 goto out; 541 542 if ((ifp->if_flags & IFF_BROADCAST) && 543 (ifra->ifra_broadaddr.sin_family == AF_INET)) 544 ia->ia_broadaddr = ifra->ifra_broadaddr; 545 if (error == 0) { 546 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 547 if (iaIsFirst && 548 (ifp->if_flags & IFF_MULTICAST) != 0) { 549 error = in_joingroup(ifp, &allhosts_addr, 550 NULL, &ii->ii_allhosts); 551 } 552 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 553 } 554 goto out; 555 556 case SIOCDIFADDR: 557 /* 558 * in_ifscrub kills the interface route. 559 */ 560 in_ifscrub(ifp, ia); 561 562 /* 563 * in_ifadown gets rid of all the rest of 564 * the routes. This is not quite the right 565 * thing to do, but at least if we are running 566 * a routing process they will come back. 567 */ 568 in_ifadown(&ia->ia_ifa, 1); 569 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 570 error = 0; 571 break; 572 573 default: 574 panic("in_control: unsupported ioctl"); 575 } 576 577 IF_ADDR_LOCK(ifp); 578 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 579 IF_ADDR_UNLOCK(ifp); 580 ifa_free(&ia->ia_ifa); /* if_addrhead */ 581 s = splnet(); 582 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link); 583 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 584 if (ia->ia_addr.sin_family == AF_INET) { 585 struct in_ifaddr *if_ia; 586 587 LIST_REMOVE(ia, ia_hash); 588 /* 589 * If this is the last IPv4 address configured on this 590 * interface, leave the all-hosts group. 591 * No state-change report need be transmitted. 592 */ 593 if_ia = NULL; 594 IFP_TO_IA(ifp, if_ia); 595 if (if_ia == NULL) { 596 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 597 IN_MULTI_LOCK(); 598 if (ii->ii_allhosts) { 599 (void)in_leavegroup_locked(ii->ii_allhosts, 600 NULL); 601 ii->ii_allhosts = NULL; 602 } 603 IN_MULTI_UNLOCK(); 604 } else 605 ifa_free(&if_ia->ia_ifa); 606 } 607 splx(s); 608out: 609 if (ia != NULL) 610 ifa_free(&ia->ia_ifa); 611 return (error); 612} 613 614/* 615 * SIOC[GAD]LIFADDR. 616 * SIOCGLIFADDR: get first address. (?!?) 617 * SIOCGLIFADDR with IFLR_PREFIX: 618 * get first address that matches the specified prefix. 619 * SIOCALIFADDR: add the specified address. 620 * SIOCALIFADDR with IFLR_PREFIX: 621 * EINVAL since we can't deduce hostid part of the address. 622 * SIOCDLIFADDR: delete the specified address. 623 * SIOCDLIFADDR with IFLR_PREFIX: 624 * delete the first address that matches the specified prefix. 625 * return values: 626 * EINVAL on invalid parameters 627 * EADDRNOTAVAIL on prefix match failed/specified address not found 628 * other values may be returned from in_ioctl() 629 */ 630static int 631in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 632 struct ifnet *ifp, struct thread *td) 633{ 634 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 635 struct ifaddr *ifa; 636 637 /* sanity checks */ 638 if (data == NULL || ifp == NULL) { 639 panic("invalid argument to in_lifaddr_ioctl"); 640 /*NOTRECHED*/ 641 } 642 643 switch (cmd) { 644 case SIOCGLIFADDR: 645 /* address must be specified on GET with IFLR_PREFIX */ 646 if ((iflr->flags & IFLR_PREFIX) == 0) 647 break; 648 /*FALLTHROUGH*/ 649 case SIOCALIFADDR: 650 case SIOCDLIFADDR: 651 /* address must be specified on ADD and DELETE */ 652 if (iflr->addr.ss_family != AF_INET) 653 return (EINVAL); 654 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 655 return (EINVAL); 656 /* XXX need improvement */ 657 if (iflr->dstaddr.ss_family 658 && iflr->dstaddr.ss_family != AF_INET) 659 return (EINVAL); 660 if (iflr->dstaddr.ss_family 661 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 662 return (EINVAL); 663 break; 664 default: /*shouldn't happen*/ 665 return (EOPNOTSUPP); 666 } 667 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 668 return (EINVAL); 669 670 switch (cmd) { 671 case SIOCALIFADDR: 672 { 673 struct in_aliasreq ifra; 674 675 if (iflr->flags & IFLR_PREFIX) 676 return (EINVAL); 677 678 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 679 bzero(&ifra, sizeof(ifra)); 680 bcopy(iflr->iflr_name, ifra.ifra_name, 681 sizeof(ifra.ifra_name)); 682 683 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 684 685 if (iflr->dstaddr.ss_family) { /*XXX*/ 686 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 687 iflr->dstaddr.ss_len); 688 } 689 690 ifra.ifra_mask.sin_family = AF_INET; 691 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 692 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 693 694 return (in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td)); 695 } 696 case SIOCGLIFADDR: 697 case SIOCDLIFADDR: 698 { 699 struct in_ifaddr *ia; 700 struct in_addr mask, candidate, match; 701 struct sockaddr_in *sin; 702 703 bzero(&mask, sizeof(mask)); 704 bzero(&match, sizeof(match)); 705 if (iflr->flags & IFLR_PREFIX) { 706 /* lookup a prefix rather than address. */ 707 in_len2mask(&mask, iflr->prefixlen); 708 709 sin = (struct sockaddr_in *)&iflr->addr; 710 match.s_addr = sin->sin_addr.s_addr; 711 match.s_addr &= mask.s_addr; 712 713 /* if you set extra bits, that's wrong */ 714 if (match.s_addr != sin->sin_addr.s_addr) 715 return (EINVAL); 716 717 } else { 718 /* on getting an address, take the 1st match */ 719 /* on deleting an address, do exact match */ 720 if (cmd != SIOCGLIFADDR) { 721 in_len2mask(&mask, 32); 722 sin = (struct sockaddr_in *)&iflr->addr; 723 match.s_addr = sin->sin_addr.s_addr; 724 } 725 } 726 727 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 728 if (ifa->ifa_addr->sa_family != AF_INET6) 729 continue; 730 if (match.s_addr == 0) 731 break; 732 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 733 candidate.s_addr &= mask.s_addr; 734 if (candidate.s_addr == match.s_addr) 735 break; 736 } 737 if (ifa == NULL) 738 return (EADDRNOTAVAIL); 739 ia = (struct in_ifaddr *)ifa; 740 741 if (cmd == SIOCGLIFADDR) { 742 /* fill in the if_laddrreq structure */ 743 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 744 745 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 746 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 747 ia->ia_dstaddr.sin_len); 748 } else 749 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 750 751 iflr->prefixlen = 752 in_mask2len(&ia->ia_sockmask.sin_addr); 753 754 iflr->flags = 0; /*XXX*/ 755 756 return (0); 757 } else { 758 struct in_aliasreq ifra; 759 760 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 761 bzero(&ifra, sizeof(ifra)); 762 bcopy(iflr->iflr_name, ifra.ifra_name, 763 sizeof(ifra.ifra_name)); 764 765 bcopy(&ia->ia_addr, &ifra.ifra_addr, 766 ia->ia_addr.sin_len); 767 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 768 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 769 ia->ia_dstaddr.sin_len); 770 } 771 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 772 ia->ia_sockmask.sin_len); 773 774 return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 775 ifp, td)); 776 } 777 } 778 } 779 780 return (EOPNOTSUPP); /*just for safety*/ 781} 782 783/* 784 * Delete any existing route for an interface. 785 */ 786void 787in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia) 788{ 789 790 in_scrubprefix(ia); 791} 792 793/* 794 * Initialize an interface's internet address 795 * and routing table entry. 796 */ 797static int 798in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, 799 int scrub) 800{ 801 INIT_VNET_NET(ifp->if_vnet); 802 INIT_VNET_INET(ifp->if_vnet); 803 register u_long i = ntohl(sin->sin_addr.s_addr); 804 struct sockaddr_in oldaddr; 805 struct rtentry *rt = NULL; 806 struct rt_addrinfo info; 807 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 808 int s = splimp(), flags = RTF_UP, error = 0; 809 810 oldaddr = ia->ia_addr; 811 if (oldaddr.sin_family == AF_INET) 812 LIST_REMOVE(ia, ia_hash); 813 ia->ia_addr = *sin; 814 if (ia->ia_addr.sin_family == AF_INET) 815 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 816 ia, ia_hash); 817 /* 818 * Give the interface a chance to initialize 819 * if this is its first address, 820 * and to validate the address if necessary. 821 */ 822 if (ifp->if_ioctl != NULL) { 823 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 824 if (error) { 825 splx(s); 826 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 827 ia->ia_addr = oldaddr; 828 if (ia->ia_addr.sin_family == AF_INET) 829 LIST_INSERT_HEAD(INADDR_HASH( 830 ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 831 else 832 /* 833 * If oldaddr family is not AF_INET (e.g. 834 * interface has been just created) in_control 835 * does not call LIST_REMOVE, and we end up 836 * with bogus ia entries in hash 837 */ 838 LIST_REMOVE(ia, ia_hash); 839 return (error); 840 } 841 } 842 splx(s); 843 if (scrub) { 844 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 845 in_ifscrub(ifp, ia); 846 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 847 } 848 if (IN_CLASSA(i)) 849 ia->ia_netmask = IN_CLASSA_NET; 850 else if (IN_CLASSB(i)) 851 ia->ia_netmask = IN_CLASSB_NET; 852 else 853 ia->ia_netmask = IN_CLASSC_NET; 854 /* 855 * The subnet mask usually includes at least the standard network part, 856 * but may may be smaller in the case of supernetting. 857 * If it is set, we believe it. 858 */ 859 if (ia->ia_subnetmask == 0) { 860 ia->ia_subnetmask = ia->ia_netmask; 861 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 862 } else 863 ia->ia_netmask &= ia->ia_subnetmask; 864 ia->ia_net = i & ia->ia_netmask; 865 ia->ia_subnet = i & ia->ia_subnetmask; 866 in_socktrim(&ia->ia_sockmask); 867#ifdef DEV_CARP 868 /* 869 * XXX: carp(4) does not have interface route 870 */ 871 if (ifp->if_type == IFT_CARP) 872 return (0); 873#endif 874 /* 875 * Add route for the network. 876 */ 877 ia->ia_ifa.ifa_metric = ifp->if_metric; 878 if (ifp->if_flags & IFF_BROADCAST) { 879 ia->ia_broadaddr.sin_addr.s_addr = 880 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 881 ia->ia_netbroadcast.s_addr = 882 htonl(ia->ia_net | ~ ia->ia_netmask); 883 } else if (ifp->if_flags & IFF_LOOPBACK) { 884 ia->ia_dstaddr = ia->ia_addr; 885 flags |= RTF_HOST; 886 } else if (ifp->if_flags & IFF_POINTOPOINT) { 887 if (ia->ia_dstaddr.sin_family != AF_INET) 888 return (0); 889 flags |= RTF_HOST; 890 } 891 if ((error = in_addprefix(ia, flags)) != 0) 892 return (error); 893 894 if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY) 895 return (0); 896 897 /* 898 * add a loopback route to self 899 */ 900 if (!(ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) { 901 bzero(&info, sizeof(info)); 902 info.rti_ifp = V_loif; 903 info.rti_flags = ia->ia_flags | RTF_HOST | RTF_STATIC; 904 info.rti_info[RTAX_DST] = (struct sockaddr *)&ia->ia_addr; 905 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 906 error = rtrequest1_fib(RTM_ADD, &info, &rt, 0); 907 908 if (error == 0 && rt != NULL) { 909 RT_LOCK(rt); 910 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 911 rt->rt_ifp->if_type; 912 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 913 rt->rt_ifp->if_index; 914 RT_REMREF(rt); 915 RT_UNLOCK(rt); 916 } else if (error != 0) 917 log(LOG_INFO, "in_ifinit: insertion failed\n"); 918 } 919 920 return (error); 921} 922 923#define rtinitflags(x) \ 924 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 925 ? RTF_HOST : 0) 926/* 927 * Check if we have a route for the given prefix already or add one accordingly. 928 */ 929static int 930in_addprefix(struct in_ifaddr *target, int flags) 931{ 932 INIT_VNET_INET(curvnet); 933 struct in_ifaddr *ia; 934 struct in_addr prefix, mask, p, m; 935 int error; 936 937 if ((flags & RTF_HOST) != 0) { 938 prefix = target->ia_dstaddr.sin_addr; 939 mask.s_addr = 0; 940 } else { 941 prefix = target->ia_addr.sin_addr; 942 mask = target->ia_sockmask.sin_addr; 943 prefix.s_addr &= mask.s_addr; 944 } 945 946 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 947 if (rtinitflags(ia)) { 948 p = ia->ia_addr.sin_addr; 949 950 if (prefix.s_addr != p.s_addr) 951 continue; 952 } else { 953 p = ia->ia_addr.sin_addr; 954 m = ia->ia_sockmask.sin_addr; 955 p.s_addr &= m.s_addr; 956 957 if (prefix.s_addr != p.s_addr || 958 mask.s_addr != m.s_addr) 959 continue; 960 } 961 962 /* 963 * If we got a matching prefix route inserted by other 964 * interface address, we are done here. 965 */ 966 if (ia->ia_flags & IFA_ROUTE) { 967 if (V_sameprefixcarponly && 968 target->ia_ifp->if_type != IFT_CARP && 969 ia->ia_ifp->if_type != IFT_CARP) 970 return (EEXIST); 971 else 972 return (0); 973 } 974 } 975 976 /* 977 * No-one seem to have this prefix route, so we try to insert it. 978 */ 979 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 980 if (!error) 981 target->ia_flags |= IFA_ROUTE; 982 return (error); 983} 984 985extern void arp_ifscrub(struct ifnet *ifp, uint32_t addr); 986 987/* 988 * If there is no other address in the system that can serve a route to the 989 * same prefix, remove the route. Hand over the route to the new address 990 * otherwise. 991 */ 992static int 993in_scrubprefix(struct in_ifaddr *target) 994{ 995 INIT_VNET_NET(curvnet); 996 INIT_VNET_INET(curvnet); 997 struct in_ifaddr *ia; 998 struct in_addr prefix, mask, p; 999 int error; 1000 struct sockaddr_in prefix0, mask0; 1001 struct rt_addrinfo info; 1002 struct sockaddr_dl null_sdl; 1003 1004 if ((target->ia_flags & IFA_ROUTE) == 0) 1005 return (0); 1006 1007 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) && 1008 !(target->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) { 1009 bzero(&null_sdl, sizeof(null_sdl)); 1010 null_sdl.sdl_len = sizeof(null_sdl); 1011 null_sdl.sdl_family = AF_LINK; 1012 null_sdl.sdl_type = V_loif->if_type; 1013 null_sdl.sdl_index = V_loif->if_index; 1014 bzero(&info, sizeof(info)); 1015 info.rti_flags = target->ia_flags | RTF_HOST | RTF_STATIC; 1016 info.rti_info[RTAX_DST] = (struct sockaddr *)&target->ia_addr; 1017 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1018 error = rtrequest1_fib(RTM_DELETE, &info, NULL, 0); 1019 1020 if (error != 0) 1021 log(LOG_INFO, "in_scrubprefix: deletion failed\n"); 1022 } 1023 1024 if (rtinitflags(target)) 1025 prefix = target->ia_dstaddr.sin_addr; 1026 else { 1027 prefix = target->ia_addr.sin_addr; 1028 mask = target->ia_sockmask.sin_addr; 1029 prefix.s_addr &= mask.s_addr; 1030 /* remove arp cache */ 1031 arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr); 1032 } 1033 1034 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1035 if (rtinitflags(ia)) 1036 p = ia->ia_dstaddr.sin_addr; 1037 else { 1038 p = ia->ia_addr.sin_addr; 1039 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1040 } 1041 1042 if (prefix.s_addr != p.s_addr) 1043 continue; 1044 1045 /* 1046 * If we got a matching prefix address, move IFA_ROUTE and 1047 * the route itself to it. Make sure that routing daemons 1048 * get a heads-up. 1049 * 1050 * XXX: a special case for carp(4) interface 1051 */ 1052 if ((ia->ia_flags & IFA_ROUTE) == 0 1053#ifdef DEV_CARP 1054 && (ia->ia_ifp->if_type != IFT_CARP) 1055#endif 1056 ) { 1057 rtinit(&(target->ia_ifa), (int)RTM_DELETE, 1058 rtinitflags(target)); 1059 target->ia_flags &= ~IFA_ROUTE; 1060 1061 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 1062 rtinitflags(ia) | RTF_UP); 1063 if (error == 0) 1064 ia->ia_flags |= IFA_ROUTE; 1065 return (error); 1066 } 1067 } 1068 1069 /* 1070 * remove all L2 entries on the given prefix 1071 */ 1072 bzero(&prefix0, sizeof(prefix0)); 1073 prefix0.sin_len = sizeof(prefix0); 1074 prefix0.sin_family = AF_INET; 1075 prefix0.sin_addr.s_addr = target->ia_subnet; 1076 bzero(&mask0, sizeof(mask0)); 1077 mask0.sin_len = sizeof(mask0); 1078 mask0.sin_family = AF_INET; 1079 mask0.sin_addr.s_addr = target->ia_subnetmask; 1080 lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0, 1081 (struct sockaddr *)&mask0); 1082 1083 /* 1084 * As no-one seem to have this prefix, we can remove the route. 1085 */ 1086 rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 1087 target->ia_flags &= ~IFA_ROUTE; 1088 return (0); 1089} 1090 1091#undef rtinitflags 1092 1093/* 1094 * Return 1 if the address might be a local broadcast address. 1095 */ 1096int 1097in_broadcast(struct in_addr in, struct ifnet *ifp) 1098{ 1099 register struct ifaddr *ifa; 1100 u_long t; 1101 1102 if (in.s_addr == INADDR_BROADCAST || 1103 in.s_addr == INADDR_ANY) 1104 return (1); 1105 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1106 return (0); 1107 t = ntohl(in.s_addr); 1108 /* 1109 * Look through the list of addresses for a match 1110 * with a broadcast address. 1111 */ 1112#define ia ((struct in_ifaddr *)ifa) 1113 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1114 if (ifa->ifa_addr->sa_family == AF_INET && 1115 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1116 in.s_addr == ia->ia_netbroadcast.s_addr || 1117 /* 1118 * Check for old-style (host 0) broadcast. 1119 */ 1120 t == ia->ia_subnet || t == ia->ia_net) && 1121 /* 1122 * Check for an all one subnetmask. These 1123 * only exist when an interface gets a secondary 1124 * address. 1125 */ 1126 ia->ia_subnetmask != (u_long)0xffffffff) 1127 return (1); 1128 return (0); 1129#undef ia 1130} 1131 1132/* 1133 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 1134 */ 1135void 1136in_ifdetach(struct ifnet *ifp) 1137{ 1138 INIT_VNET_INET(ifp->if_vnet); 1139 1140 in_pcbpurgeif0(&V_ripcbinfo, ifp); 1141 in_pcbpurgeif0(&V_udbinfo, ifp); 1142 in_purgemaddrs(ifp); 1143} 1144 1145/* 1146 * Delete all IPv4 multicast address records, and associated link-layer 1147 * multicast address records, associated with ifp. 1148 * XXX It looks like domifdetach runs AFTER the link layer cleanup. 1149 * XXX This should not race with ifma_protospec being set during 1150 * a new allocation, if it does, we have bigger problems. 1151 */ 1152static void 1153in_purgemaddrs(struct ifnet *ifp) 1154{ 1155 LIST_HEAD(,in_multi) purgeinms; 1156 struct in_multi *inm, *tinm; 1157 struct ifmultiaddr *ifma; 1158 1159 LIST_INIT(&purgeinms); 1160 IN_MULTI_LOCK(); 1161 1162 /* 1163 * Extract list of in_multi associated with the detaching ifp 1164 * which the PF_INET layer is about to release. 1165 * We need to do this as IF_ADDR_LOCK() may be re-acquired 1166 * by code further down. 1167 */ 1168 IF_ADDR_LOCK(ifp); 1169 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1170 if (ifma->ifma_addr->sa_family != AF_INET || 1171 ifma->ifma_protospec == NULL) 1172 continue; 1173#if 0 1174 KASSERT(ifma->ifma_protospec != NULL, 1175 ("%s: ifma_protospec is NULL", __func__)); 1176#endif 1177 inm = (struct in_multi *)ifma->ifma_protospec; 1178 LIST_INSERT_HEAD(&purgeinms, inm, inm_link); 1179 } 1180 IF_ADDR_UNLOCK(ifp); 1181 1182 LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) { 1183 LIST_REMOVE(inm, inm_link); 1184 inm_release_locked(inm); 1185 } 1186 igmp_ifdetach(ifp); 1187 1188 IN_MULTI_UNLOCK(); 1189} 1190 1191#include <net/if_dl.h> 1192#include <netinet/if_ether.h> 1193 1194struct in_llentry { 1195 struct llentry base; 1196 struct sockaddr_in l3_addr4; 1197}; 1198 1199static struct llentry * 1200in_lltable_new(const struct sockaddr *l3addr, u_int flags) 1201{ 1202 struct in_llentry *lle; 1203 1204 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_DONTWAIT | M_ZERO); 1205 if (lle == NULL) /* NB: caller generates msg */ 1206 return NULL; 1207 1208 callout_init(&lle->base.la_timer, CALLOUT_MPSAFE); 1209 /* 1210 * For IPv4 this will trigger "arpresolve" to generate 1211 * an ARP request. 1212 */ 1213 lle->base.la_expire = time_second; /* mark expired */ 1214 lle->l3_addr4 = *(const struct sockaddr_in *)l3addr; 1215 lle->base.lle_refcnt = 1; 1216 LLE_LOCK_INIT(&lle->base); 1217 return &lle->base; 1218} 1219 1220/* 1221 * Deletes an address from the address table. 1222 * This function is called by the timer functions 1223 * such as arptimer() and nd6_llinfo_timer(), and 1224 * the caller does the locking. 1225 */ 1226static void 1227in_lltable_free(struct lltable *llt, struct llentry *lle) 1228{ 1229 LLE_WUNLOCK(lle); 1230 LLE_LOCK_DESTROY(lle); 1231 free(lle, M_LLTABLE); 1232} 1233 1234 1235#define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 1236 (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 ) 1237 1238static void 1239in_lltable_prefix_free(struct lltable *llt, 1240 const struct sockaddr *prefix, 1241 const struct sockaddr *mask) 1242{ 1243 const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix; 1244 const struct sockaddr_in *msk = (const struct sockaddr_in *)mask; 1245 struct llentry *lle, *next; 1246 register int i; 1247 1248 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) { 1249 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 1250 1251 if (IN_ARE_MASKED_ADDR_EQUAL((struct sockaddr_in *)L3_ADDR(lle), 1252 pfx, msk)) { 1253 callout_drain(&lle->la_timer); 1254 LLE_WLOCK(lle); 1255 llentry_free(lle); 1256 } 1257 } 1258 } 1259} 1260 1261 1262static int 1263in_lltable_rtcheck(struct ifnet *ifp, const struct sockaddr *l3addr) 1264{ 1265 struct rtentry *rt; 1266 1267 KASSERT(l3addr->sa_family == AF_INET, 1268 ("sin_family %d", l3addr->sa_family)); 1269 1270 /* XXX rtalloc1 should take a const param */ 1271 rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0); 1272 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 1273 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n", 1274 inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr)); 1275 if (rt != NULL) 1276 RTFREE_LOCKED(rt); 1277 return (EINVAL); 1278 } 1279 RTFREE_LOCKED(rt); 1280 return 0; 1281} 1282 1283/* 1284 * Return NULL if not found or marked for deletion. 1285 * If found return lle read locked. 1286 */ 1287static struct llentry * 1288in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1289{ 1290 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1291 struct ifnet *ifp = llt->llt_ifp; 1292 struct llentry *lle; 1293 struct llentries *lleh; 1294 u_int hashkey; 1295 1296 IF_AFDATA_LOCK_ASSERT(ifp); 1297 KASSERT(l3addr->sa_family == AF_INET, 1298 ("sin_family %d", l3addr->sa_family)); 1299 1300 hashkey = sin->sin_addr.s_addr; 1301 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 1302 LIST_FOREACH(lle, lleh, lle_next) { 1303 struct sockaddr_in *sa2 = (struct sockaddr_in *)L3_ADDR(lle); 1304 if (lle->la_flags & LLE_DELETED) 1305 continue; 1306 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr) 1307 break; 1308 } 1309 if (lle == NULL) { 1310#ifdef DIAGNOSTICS 1311 if (flags & LLE_DELETE) 1312 log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle); 1313#endif 1314 if (!(flags & LLE_CREATE)) 1315 return (NULL); 1316 /* 1317 * A route that covers the given address must have 1318 * been installed 1st because we are doing a resolution, 1319 * verify this. 1320 */ 1321 if (!(flags & LLE_IFADDR) && 1322 in_lltable_rtcheck(ifp, l3addr) != 0) 1323 goto done; 1324 1325 lle = in_lltable_new(l3addr, flags); 1326 if (lle == NULL) { 1327 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 1328 goto done; 1329 } 1330 lle->la_flags = flags & ~LLE_CREATE; 1331 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 1332 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 1333 lle->la_flags |= (LLE_VALID | LLE_STATIC); 1334 } 1335 1336 lle->lle_tbl = llt; 1337 lle->lle_head = lleh; 1338 LIST_INSERT_HEAD(lleh, lle, lle_next); 1339 } else if (flags & LLE_DELETE) { 1340 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 1341 LLE_WLOCK(lle); 1342 lle->la_flags = LLE_DELETED; 1343 LLE_WUNLOCK(lle); 1344#ifdef DIAGNOSTICS 1345 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 1346#endif 1347 } 1348 lle = (void *)-1; 1349 1350 } 1351 if (LLE_IS_VALID(lle)) { 1352 if (flags & LLE_EXCLUSIVE) 1353 LLE_WLOCK(lle); 1354 else 1355 LLE_RLOCK(lle); 1356 } 1357done: 1358 return (lle); 1359} 1360 1361static int 1362in_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 1363{ 1364#define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle)) 1365 struct ifnet *ifp = llt->llt_ifp; 1366 struct llentry *lle; 1367 /* XXX stack use */ 1368 struct { 1369 struct rt_msghdr rtm; 1370 struct sockaddr_inarp sin; 1371 struct sockaddr_dl sdl; 1372 } arpc; 1373 int error, i; 1374 1375 /* XXXXX 1376 * current IFNET_RLOCK() is mapped to IFNET_WLOCK() 1377 * so it is okay to use this ASSERT, change it when 1378 * IFNET lock is finalized 1379 */ 1380 IFNET_WLOCK_ASSERT(); 1381 1382 error = 0; 1383 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1384 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 1385 struct sockaddr_dl *sdl; 1386 1387 /* skip deleted entries */ 1388 if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID) 1389 continue; 1390 /* Skip if jailed and not a valid IP of the prison. */ 1391 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 1392 continue; 1393 /* 1394 * produce a msg made of: 1395 * struct rt_msghdr; 1396 * struct sockaddr_inarp; (IPv4) 1397 * struct sockaddr_dl; 1398 */ 1399 bzero(&arpc, sizeof(arpc)); 1400 arpc.rtm.rtm_msglen = sizeof(arpc); 1401 arpc.rtm.rtm_version = RTM_VERSION; 1402 arpc.rtm.rtm_type = RTM_GET; 1403 arpc.rtm.rtm_flags = RTF_UP; 1404 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1405 arpc.sin.sin_family = AF_INET; 1406 arpc.sin.sin_len = sizeof(arpc.sin); 1407 arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr; 1408 1409 /* publish */ 1410 if (lle->la_flags & LLE_PUB) { 1411 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1412 /* proxy only */ 1413 if (lle->la_flags & LLE_PROXY) 1414 arpc.sin.sin_other = SIN_PROXY; 1415 } 1416 1417 sdl = &arpc.sdl; 1418 sdl->sdl_family = AF_LINK; 1419 sdl->sdl_len = sizeof(*sdl); 1420 sdl->sdl_alen = ifp->if_addrlen; 1421 sdl->sdl_index = ifp->if_index; 1422 sdl->sdl_type = ifp->if_type; 1423 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1424 1425 arpc.rtm.rtm_rmx.rmx_expire = 1426 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1427 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1428 if (lle->la_flags & LLE_STATIC) 1429 arpc.rtm.rtm_flags |= RTF_STATIC; 1430 arpc.rtm.rtm_index = ifp->if_index; 1431 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1432 if (error) 1433 break; 1434 } 1435 } 1436 return error; 1437#undef SIN 1438} 1439 1440void * 1441in_domifattach(struct ifnet *ifp) 1442{ 1443 struct in_ifinfo *ii; 1444 struct lltable *llt; 1445 1446 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); 1447 1448 llt = lltable_init(ifp, AF_INET); 1449 if (llt != NULL) { 1450 llt->llt_new = in_lltable_new; 1451 llt->llt_free = in_lltable_free; 1452 llt->llt_prefix_free = in_lltable_prefix_free; 1453 llt->llt_rtcheck = in_lltable_rtcheck; 1454 llt->llt_lookup = in_lltable_lookup; 1455 llt->llt_dump = in_lltable_dump; 1456 } 1457 ii->ii_llt = llt; 1458 1459 ii->ii_igmp = igmp_domifattach(ifp); 1460 1461 return ii; 1462} 1463 1464void 1465in_domifdetach(struct ifnet *ifp, void *aux) 1466{ 1467 struct in_ifinfo *ii = (struct in_ifinfo *)aux; 1468 1469 igmp_domifdetach(ifp); 1470 lltable_free(ii->ii_llt); 1471 free(ii, M_IFADDR); 1472} 1473