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 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/vimage.h> 49 50 #include <net/if.h> 51 #include <net/if_llatbl.h> 52 #include <net/if_types.h> 53 #include <net/route.h> 54 55 #include <netinet/in.h> 56 #include <netinet/in_var.h> 57 #include <netinet/in_pcb.h> 58 #include <netinet/ip_var.h> 59 #include <netinet/vinet.h> 60 #include <netinet/igmp_var.h> 61 62 static int in_mask2len(struct in_addr *); 63 static void in_len2mask(struct in_addr *, int); 64 static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, 65 struct ifnet *, struct thread *); 66 67 static int in_addprefix(struct in_ifaddr *, int); 68 static int in_scrubprefix(struct in_ifaddr *); 69 static void in_socktrim(struct sockaddr_in *); 70 static int in_ifinit(struct ifnet *, 71 struct in_ifaddr *, struct sockaddr_in *, int); 72 static void in_purgemaddrs(struct ifnet *); 73 74 #ifdef VIMAGE_GLOBALS 75 static int subnetsarelocal; 76 static int sameprefixcarponly; 77 extern struct inpcbinfo ripcbinfo; 78 #endif 79 80 SYSCTL_V_INT(V_NET, vnet_inet, _net_inet_ip, OID_AUTO, subnets_are_local, 81 CTLFLAG_RW, subnetsarelocal, 0, 82 "Treat all subnets as directly connected"); 83 SYSCTL_V_INT(V_NET, vnet_inet, _net_inet_ip, OID_AUTO, same_prefix_carp_only, 84 CTLFLAG_RW, sameprefixcarponly, 0, 85 "Refuse to create same prefixes on different interfaces"); 86 87 /* 88 * Return 1 if an internet address is for a ``local'' host 89 * (one to which we have a connection). If subnetsarelocal 90 * is true, this includes other subnets of the local net. 91 * Otherwise, it includes only the directly-connected (sub)nets. 92 */ 93 int 94 in_localaddr(struct in_addr in) 95 { 96 INIT_VNET_INET(curvnet); 97 register u_long i = ntohl(in.s_addr); 98 register struct in_ifaddr *ia; 99 100 if (V_subnetsarelocal) { 101 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) 102 if ((i & ia->ia_netmask) == ia->ia_net) 103 return (1); 104 } else { 105 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) 106 if ((i & ia->ia_subnetmask) == ia->ia_subnet) 107 return (1); 108 } 109 return (0); 110 } 111 112 /* 113 * Return 1 if an internet address is for the local host and configured 114 * on one of its interfaces. 115 */ 116 int 117 in_localip(struct in_addr in) 118 { 119 INIT_VNET_INET(curvnet); 120 struct in_ifaddr *ia; 121 122 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { 123 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) 124 return (1); 125 } 126 return (0); 127 } 128 129 /* 130 * Determine whether an IP address is in a reserved set of addresses 131 * that may not be forwarded, or whether datagrams to that destination 132 * may be forwarded. 133 */ 134 int 135 in_canforward(struct in_addr in) 136 { 137 register u_long i = ntohl(in.s_addr); 138 register u_long net; 139 140 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i)) 141 return (0); 142 if (IN_CLASSA(i)) { 143 net = i & IN_CLASSA_NET; 144 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 145 return (0); 146 } 147 return (1); 148 } 149 150 /* 151 * Trim a mask in a sockaddr 152 */ 153 static void 154 in_socktrim(struct sockaddr_in *ap) 155 { 156 register char *cplim = (char *) &ap->sin_addr; 157 register char *cp = (char *) (&ap->sin_addr + 1); 158 159 ap->sin_len = 0; 160 while (--cp >= cplim) 161 if (*cp) { 162 (ap)->sin_len = cp - (char *) (ap) + 1; 163 break; 164 } 165 } 166 167 static int 168 in_mask2len(mask) 169 struct in_addr *mask; 170 { 171 int x, y; 172 u_char *p; 173 174 p = (u_char *)mask; 175 for (x = 0; x < sizeof(*mask); x++) { 176 if (p[x] != 0xff) 177 break; 178 } 179 y = 0; 180 if (x < sizeof(*mask)) { 181 for (y = 0; y < 8; y++) { 182 if ((p[x] & (0x80 >> y)) == 0) 183 break; 184 } 185 } 186 return (x * 8 + y); 187 } 188 189 static void 190 in_len2mask(struct in_addr *mask, int len) 191 { 192 int i; 193 u_char *p; 194 195 p = (u_char *)mask; 196 bzero(mask, sizeof(*mask)); 197 for (i = 0; i < len / 8; i++) 198 p[i] = 0xff; 199 if (len % 8) 200 p[i] = (0xff00 >> (len % 8)) & 0xff; 201 } 202 203 /* 204 * Generic internet control operations (ioctl's). 205 * 206 * ifp is NULL if not an interface-specific ioctl. 207 */ 208 /* ARGSUSED */ 209 int 210 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 211 struct thread *td) 212 { 213 INIT_VNET_INET(curvnet); /* both so and ifp can be NULL here! */ 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_ifaddr *oia; 220 struct in_ifinfo *ii; 221 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 222 struct sockaddr_in oldaddr; 223 int error, hostIsNew, iaIsNew, maskIsNew, s; 224 int iaIsFirst; 225 226 ia = NULL; 227 iaIsFirst = 0; 228 iaIsNew = 0; 229 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 230 231 /* 232 * Filter out ioctls we implement directly; forward the rest on to 233 * in_lifaddr_ioctl() and ifp->if_ioctl(). 234 */ 235 switch (cmd) { 236 case SIOCAIFADDR: 237 case SIOCDIFADDR: 238 case SIOCGIFADDR: 239 case SIOCGIFBRDADDR: 240 case SIOCGIFDSTADDR: 241 case SIOCGIFNETMASK: 242 case SIOCSIFADDR: 243 case SIOCSIFBRDADDR: 244 case SIOCSIFDSTADDR: 245 case SIOCSIFNETMASK: 246 break; 247 248 case SIOCALIFADDR: 249 if (td != NULL) { 250 error = priv_check(td, PRIV_NET_ADDIFADDR); 251 if (error) 252 return (error); 253 } 254 if (ifp == NULL) 255 return (EINVAL); 256 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 257 258 case SIOCDLIFADDR: 259 if (td != NULL) { 260 error = priv_check(td, PRIV_NET_DELIFADDR); 261 if (error) 262 return (error); 263 } 264 if (ifp == NULL) 265 return (EINVAL); 266 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 267 268 case SIOCGLIFADDR: 269 if (ifp == NULL) 270 return (EINVAL); 271 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 272 273 default: 274 if (ifp == NULL || ifp->if_ioctl == NULL) 275 return (EOPNOTSUPP); 276 return ((*ifp->if_ioctl)(ifp, cmd, data)); 277 } 278 279 if (ifp == NULL) 280 return (EADDRNOTAVAIL); 281 282 /* 283 * Security checks before we get involved in any work. 284 */ 285 switch (cmd) { 286 case SIOCAIFADDR: 287 case SIOCSIFADDR: 288 case SIOCSIFBRDADDR: 289 case SIOCSIFNETMASK: 290 case SIOCSIFDSTADDR: 291 if (td != NULL) { 292 error = priv_check(td, PRIV_NET_ADDIFADDR); 293 if (error) 294 return (error); 295 } 296 break; 297 298 case SIOCDIFADDR: 299 if (td != NULL) { 300 error = priv_check(td, PRIV_NET_DELIFADDR); 301 if (error) 302 return (error); 303 } 304 break; 305 } 306 307 /* 308 * Find address for this interface, if it exists. 309 * 310 * If an alias address was specified, find that one instead of the 311 * first one on the interface, if possible. 312 */ 313 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 314 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) { 315 if (iap->ia_ifp == ifp && 316 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 317 if (td == NULL || prison_check_ip4(td->td_ucred, 318 &dst) == 0) 319 ia = iap; 320 break; 321 } 322 } 323 IF_ADDR_LOCK(ifp); 324 if (ia == NULL) { 325 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 326 iap = ifatoia(ifa); 327 if (iap->ia_addr.sin_family == AF_INET) { 328 if (td != NULL && 329 prison_check_ip4(td->td_ucred, 330 &iap->ia_addr.sin_addr) != 0) 331 continue; 332 ia = iap; 333 break; 334 } 335 } 336 } 337 if (ia == NULL) 338 iaIsFirst = 1; 339 340 error = 0; 341 switch (cmd) { 342 case SIOCAIFADDR: 343 case SIOCDIFADDR: 344 if (ifra->ifra_addr.sin_family == AF_INET) { 345 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 346 if (ia->ia_ifp == ifp && 347 ia->ia_addr.sin_addr.s_addr == 348 ifra->ifra_addr.sin_addr.s_addr) 349 break; 350 } 351 if ((ifp->if_flags & IFF_POINTOPOINT) 352 && (cmd == SIOCAIFADDR) 353 && (ifra->ifra_dstaddr.sin_addr.s_addr 354 == INADDR_ANY)) { 355 error = EDESTADDRREQ; 356 goto out_unlock; 357 } 358 } 359 if (cmd == SIOCDIFADDR && ia == NULL) { 360 error = EADDRNOTAVAIL; 361 goto out_unlock; 362 } 363 /* FALLTHROUGH */ 364 case SIOCSIFADDR: 365 case SIOCSIFNETMASK: 366 case SIOCSIFDSTADDR: 367 if (ia == NULL) { 368 ia = (struct in_ifaddr *) 369 malloc(sizeof *ia, M_IFADDR, M_NOWAIT | 370 M_ZERO); 371 if (ia == NULL) { 372 error = ENOBUFS; 373 goto out_unlock; 374 } 375 376 ifa = &ia->ia_ifa; 377 IFA_LOCK_INIT(ifa); 378 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 379 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 380 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 381 ifa->ifa_refcnt = 1; 382 383 ia->ia_sockmask.sin_len = 8; 384 ia->ia_sockmask.sin_family = AF_INET; 385 if (ifp->if_flags & IFF_BROADCAST) { 386 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 387 ia->ia_broadaddr.sin_family = AF_INET; 388 } 389 ia->ia_ifp = ifp; 390 391 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 392 s = splnet(); 393 TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link); 394 splx(s); 395 iaIsNew = 1; 396 } 397 break; 398 399 case SIOCSIFBRDADDR: 400 case SIOCGIFADDR: 401 case SIOCGIFNETMASK: 402 case SIOCGIFDSTADDR: 403 case SIOCGIFBRDADDR: 404 if (ia == NULL) { 405 error = EADDRNOTAVAIL; 406 goto out_unlock; 407 } 408 break; 409 } 410 411 /* 412 * Most paths in this switch return directly or via out_unlock. Only 413 * paths that remove the address break in order to hit common removal 414 * code. 415 * 416 * XXXRW: We enter the switch with IF_ADDR_LOCK() held, but leave 417 * without it. This is a bug. 418 */ 419 IF_ADDR_LOCK_ASSERT(ifp); 420 switch (cmd) { 421 case SIOCGIFADDR: 422 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 423 goto out_unlock; 424 425 case SIOCGIFBRDADDR: 426 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 427 error = EINVAL; 428 goto out_unlock; 429 } 430 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 431 goto out_unlock; 432 433 case SIOCGIFDSTADDR: 434 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 435 error = EINVAL; 436 goto out_unlock; 437 } 438 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 439 goto out_unlock; 440 441 case SIOCGIFNETMASK: 442 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 443 goto out_unlock; 444 445 case SIOCSIFDSTADDR: 446 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 447 error = EINVAL; 448 goto out_unlock; 449 } 450 oldaddr = ia->ia_dstaddr; 451 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 452 IF_ADDR_UNLOCK(ifp); 453 454 /* 455 * XXXRW: Locks dropped for if_ioctl and rtinit, but ia is 456 * still being used. 457 */ 458 if (ifp->if_ioctl != NULL) { 459 error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, 460 (caddr_t)ia); 461 if (error) { 462 ia->ia_dstaddr = oldaddr; 463 return (error); 464 } 465 } 466 if (ia->ia_flags & IFA_ROUTE) { 467 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 468 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 469 ia->ia_ifa.ifa_dstaddr = 470 (struct sockaddr *)&ia->ia_dstaddr; 471 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 472 } 473 return (0); 474 475 case SIOCSIFBRDADDR: 476 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 477 error = EINVAL; 478 goto out_unlock; 479 } 480 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 481 goto out_unlock; 482 483 case SIOCSIFADDR: 484 IF_ADDR_UNLOCK(ifp); 485 486 /* 487 * XXXRW: Locks dropped for in_ifinit and in_joingroup, but ia 488 * is still being used. 489 */ 490 error = in_ifinit(ifp, ia, 491 (struct sockaddr_in *) &ifr->ifr_addr, 1); 492 if (error != 0 && iaIsNew) 493 break; 494 if (error == 0) { 495 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 496 if (iaIsFirst && 497 (ifp->if_flags & IFF_MULTICAST) != 0) { 498 error = in_joingroup(ifp, &allhosts_addr, 499 NULL, &ii->ii_allhosts); 500 } 501 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 502 } 503 return (0); 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_unlock; 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_ADDR_UNLOCK(ifp); 523 524 /* 525 * XXXRW: Locks dropped for in_ifscrub and in_ifinit, but ia 526 * is still being used. 527 */ 528 if (ifra->ifra_mask.sin_len) { 529 in_ifscrub(ifp, ia); 530 ia->ia_sockmask = ifra->ifra_mask; 531 ia->ia_sockmask.sin_family = AF_INET; 532 ia->ia_subnetmask = 533 ntohl(ia->ia_sockmask.sin_addr.s_addr); 534 maskIsNew = 1; 535 } 536 if ((ifp->if_flags & IFF_POINTOPOINT) && 537 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 538 in_ifscrub(ifp, ia); 539 ia->ia_dstaddr = ifra->ifra_dstaddr; 540 maskIsNew = 1; /* We lie; but the effect's the same */ 541 } 542 if (ifra->ifra_addr.sin_family == AF_INET && 543 (hostIsNew || maskIsNew)) 544 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 545 if (error != 0 && iaIsNew) 546 break; 547 548 if ((ifp->if_flags & IFF_BROADCAST) && 549 (ifra->ifra_broadaddr.sin_family == AF_INET)) 550 ia->ia_broadaddr = ifra->ifra_broadaddr; 551 if (error == 0) { 552 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 553 if (iaIsFirst && 554 (ifp->if_flags & IFF_MULTICAST) != 0) { 555 error = in_joingroup(ifp, &allhosts_addr, 556 NULL, &ii->ii_allhosts); 557 } 558 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 559 } 560 return (error); 561 562 case SIOCDIFADDR: 563 IF_ADDR_UNLOCK(ifp); 564 565 /* 566 * XXXRW: Locks dropped for in_ifscrub and in_ifadown, but ia 567 * is still being used. 568 * 569 * in_ifscrub kills the interface route. 570 */ 571 in_ifscrub(ifp, ia); 572 573 /* 574 * in_ifadown gets rid of all the rest of 575 * the routes. This is not quite the right 576 * thing to do, but at least if we are running 577 * a routing process they will come back. 578 */ 579 in_ifadown(&ia->ia_ifa, 1); 580 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 581 error = 0; 582 break; 583 584 default: 585 panic("in_control: unsupported ioctl"); 586 } 587 588 /* 589 * XXXRW: In a more ideal world, we would still be holding 590 * IF_ADDR_LOCK here. 591 */ 592 IF_ADDR_LOCK(ifp); 593 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 594 IF_ADDR_UNLOCK(ifp); 595 s = splnet(); 596 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link); 597 if (ia->ia_addr.sin_family == AF_INET) { 598 LIST_REMOVE(ia, ia_hash); 599 /* 600 * If this is the last IPv4 address configured on this 601 * interface, leave the all-hosts group. 602 * No state-change report need be transmitted. 603 */ 604 oia = NULL; 605 IFP_TO_IA(ifp, oia); 606 if (oia == NULL) { 607 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 608 IN_MULTI_LOCK(); 609 if (ii->ii_allhosts) { 610 (void)in_leavegroup_locked(ii->ii_allhosts, 611 NULL); 612 ii->ii_allhosts = NULL; 613 } 614 IN_MULTI_UNLOCK(); 615 } 616 } 617 IFAFREE(&ia->ia_ifa); 618 splx(s); 619 620 return (error); 621 622 out_unlock: 623 IF_ADDR_UNLOCK(ifp); 624 return (error); 625 } 626 627 /* 628 * SIOC[GAD]LIFADDR. 629 * SIOCGLIFADDR: get first address. (?!?) 630 * SIOCGLIFADDR with IFLR_PREFIX: 631 * get first address that matches the specified prefix. 632 * SIOCALIFADDR: add the specified address. 633 * SIOCALIFADDR with IFLR_PREFIX: 634 * EINVAL since we can't deduce hostid part of the address. 635 * SIOCDLIFADDR: delete the specified address. 636 * SIOCDLIFADDR with IFLR_PREFIX: 637 * delete the first address that matches the specified prefix. 638 * return values: 639 * EINVAL on invalid parameters 640 * EADDRNOTAVAIL on prefix match failed/specified address not found 641 * other values may be returned from in_ioctl() 642 */ 643 static int 644 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 645 struct ifnet *ifp, struct thread *td) 646 { 647 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 648 struct ifaddr *ifa; 649 650 /* sanity checks */ 651 if (data == NULL || ifp == NULL) { 652 panic("invalid argument to in_lifaddr_ioctl"); 653 /*NOTRECHED*/ 654 } 655 656 switch (cmd) { 657 case SIOCGLIFADDR: 658 /* address must be specified on GET with IFLR_PREFIX */ 659 if ((iflr->flags & IFLR_PREFIX) == 0) 660 break; 661 /*FALLTHROUGH*/ 662 case SIOCALIFADDR: 663 case SIOCDLIFADDR: 664 /* address must be specified on ADD and DELETE */ 665 if (iflr->addr.ss_family != AF_INET) 666 return (EINVAL); 667 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 668 return (EINVAL); 669 /* XXX need improvement */ 670 if (iflr->dstaddr.ss_family 671 && iflr->dstaddr.ss_family != AF_INET) 672 return (EINVAL); 673 if (iflr->dstaddr.ss_family 674 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 675 return (EINVAL); 676 break; 677 default: /*shouldn't happen*/ 678 return (EOPNOTSUPP); 679 } 680 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 681 return (EINVAL); 682 683 switch (cmd) { 684 case SIOCALIFADDR: 685 { 686 struct in_aliasreq ifra; 687 688 if (iflr->flags & IFLR_PREFIX) 689 return (EINVAL); 690 691 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 692 bzero(&ifra, sizeof(ifra)); 693 bcopy(iflr->iflr_name, ifra.ifra_name, 694 sizeof(ifra.ifra_name)); 695 696 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 697 698 if (iflr->dstaddr.ss_family) { /*XXX*/ 699 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 700 iflr->dstaddr.ss_len); 701 } 702 703 ifra.ifra_mask.sin_family = AF_INET; 704 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 705 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 706 707 return (in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td)); 708 } 709 case SIOCGLIFADDR: 710 case SIOCDLIFADDR: 711 { 712 struct in_ifaddr *ia; 713 struct in_addr mask, candidate, match; 714 struct sockaddr_in *sin; 715 716 bzero(&mask, sizeof(mask)); 717 bzero(&match, sizeof(match)); 718 if (iflr->flags & IFLR_PREFIX) { 719 /* lookup a prefix rather than address. */ 720 in_len2mask(&mask, iflr->prefixlen); 721 722 sin = (struct sockaddr_in *)&iflr->addr; 723 match.s_addr = sin->sin_addr.s_addr; 724 match.s_addr &= mask.s_addr; 725 726 /* if you set extra bits, that's wrong */ 727 if (match.s_addr != sin->sin_addr.s_addr) 728 return (EINVAL); 729 730 } else { 731 /* on getting an address, take the 1st match */ 732 /* on deleting an address, do exact match */ 733 if (cmd != SIOCGLIFADDR) { 734 in_len2mask(&mask, 32); 735 sin = (struct sockaddr_in *)&iflr->addr; 736 match.s_addr = sin->sin_addr.s_addr; 737 } 738 } 739 740 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 741 if (ifa->ifa_addr->sa_family != AF_INET6) 742 continue; 743 if (match.s_addr == 0) 744 break; 745 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 746 candidate.s_addr &= mask.s_addr; 747 if (candidate.s_addr == match.s_addr) 748 break; 749 } 750 if (ifa == NULL) 751 return (EADDRNOTAVAIL); 752 ia = (struct in_ifaddr *)ifa; 753 754 if (cmd == SIOCGLIFADDR) { 755 /* fill in the if_laddrreq structure */ 756 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 757 758 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 759 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 760 ia->ia_dstaddr.sin_len); 761 } else 762 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 763 764 iflr->prefixlen = 765 in_mask2len(&ia->ia_sockmask.sin_addr); 766 767 iflr->flags = 0; /*XXX*/ 768 769 return (0); 770 } else { 771 struct in_aliasreq ifra; 772 773 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 774 bzero(&ifra, sizeof(ifra)); 775 bcopy(iflr->iflr_name, ifra.ifra_name, 776 sizeof(ifra.ifra_name)); 777 778 bcopy(&ia->ia_addr, &ifra.ifra_addr, 779 ia->ia_addr.sin_len); 780 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 781 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 782 ia->ia_dstaddr.sin_len); 783 } 784 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 785 ia->ia_sockmask.sin_len); 786 787 return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 788 ifp, td)); 789 } 790 } 791 } 792 793 return (EOPNOTSUPP); /*just for safety*/ 794 } 795 796 /* 797 * Delete any existing route for an interface. 798 */ 799 void 800 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia) 801 { 802 803 in_scrubprefix(ia); 804 } 805 806 /* 807 * Initialize an interface's internet address 808 * and routing table entry. 809 */ 810 static int 811 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, 812 int scrub) 813 { 814 INIT_VNET_INET(ifp->if_vnet); 815 register u_long i = ntohl(sin->sin_addr.s_addr); 816 struct sockaddr_in oldaddr; 817 int s = splimp(), flags = RTF_UP, error = 0; 818 819 oldaddr = ia->ia_addr; 820 if (oldaddr.sin_family == AF_INET) 821 LIST_REMOVE(ia, ia_hash); 822 ia->ia_addr = *sin; 823 if (ia->ia_addr.sin_family == AF_INET) 824 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 825 ia, ia_hash); 826 /* 827 * Give the interface a chance to initialize 828 * if this is its first address, 829 * and to validate the address if necessary. 830 */ 831 if (ifp->if_ioctl != NULL) { 832 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 833 if (error) { 834 splx(s); 835 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 836 ia->ia_addr = oldaddr; 837 if (ia->ia_addr.sin_family == AF_INET) 838 LIST_INSERT_HEAD(INADDR_HASH( 839 ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 840 else 841 /* 842 * If oldaddr family is not AF_INET (e.g. 843 * interface has been just created) in_control 844 * does not call LIST_REMOVE, and we end up 845 * with bogus ia entries in hash 846 */ 847 LIST_REMOVE(ia, ia_hash); 848 return (error); 849 } 850 } 851 splx(s); 852 if (scrub) { 853 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 854 in_ifscrub(ifp, ia); 855 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 856 } 857 if (IN_CLASSA(i)) 858 ia->ia_netmask = IN_CLASSA_NET; 859 else if (IN_CLASSB(i)) 860 ia->ia_netmask = IN_CLASSB_NET; 861 else 862 ia->ia_netmask = IN_CLASSC_NET; 863 /* 864 * The subnet mask usually includes at least the standard network part, 865 * but may may be smaller in the case of supernetting. 866 * If it is set, we believe it. 867 */ 868 if (ia->ia_subnetmask == 0) { 869 ia->ia_subnetmask = ia->ia_netmask; 870 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 871 } else 872 ia->ia_netmask &= ia->ia_subnetmask; 873 ia->ia_net = i & ia->ia_netmask; 874 ia->ia_subnet = i & ia->ia_subnetmask; 875 in_socktrim(&ia->ia_sockmask); 876 #ifdef DEV_CARP 877 /* 878 * XXX: carp(4) does not have interface route 879 */ 880 if (ifp->if_type == IFT_CARP) 881 return (0); 882 #endif 883 /* 884 * Add route for the network. 885 */ 886 ia->ia_ifa.ifa_metric = ifp->if_metric; 887 if (ifp->if_flags & IFF_BROADCAST) { 888 ia->ia_broadaddr.sin_addr.s_addr = 889 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 890 ia->ia_netbroadcast.s_addr = 891 htonl(ia->ia_net | ~ ia->ia_netmask); 892 } else if (ifp->if_flags & IFF_LOOPBACK) { 893 ia->ia_dstaddr = ia->ia_addr; 894 flags |= RTF_HOST; 895 } else if (ifp->if_flags & IFF_POINTOPOINT) { 896 if (ia->ia_dstaddr.sin_family != AF_INET) 897 return (0); 898 flags |= RTF_HOST; 899 } 900 if ((error = in_addprefix(ia, flags)) != 0) 901 return (error); 902 903 return (error); 904 } 905 906 #define rtinitflags(x) \ 907 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 908 ? RTF_HOST : 0) 909 /* 910 * Check if we have a route for the given prefix already or add one accordingly. 911 */ 912 static int 913 in_addprefix(struct in_ifaddr *target, int flags) 914 { 915 INIT_VNET_INET(curvnet); 916 struct in_ifaddr *ia; 917 struct in_addr prefix, mask, p, m; 918 int error; 919 920 if ((flags & RTF_HOST) != 0) { 921 prefix = target->ia_dstaddr.sin_addr; 922 mask.s_addr = 0; 923 } else { 924 prefix = target->ia_addr.sin_addr; 925 mask = target->ia_sockmask.sin_addr; 926 prefix.s_addr &= mask.s_addr; 927 } 928 929 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 930 if (rtinitflags(ia)) { 931 p = ia->ia_addr.sin_addr; 932 933 if (prefix.s_addr != p.s_addr) 934 continue; 935 } else { 936 p = ia->ia_addr.sin_addr; 937 m = ia->ia_sockmask.sin_addr; 938 p.s_addr &= m.s_addr; 939 940 if (prefix.s_addr != p.s_addr || 941 mask.s_addr != m.s_addr) 942 continue; 943 } 944 945 /* 946 * If we got a matching prefix route inserted by other 947 * interface address, we are done here. 948 */ 949 if (ia->ia_flags & IFA_ROUTE) { 950 if (V_sameprefixcarponly && 951 target->ia_ifp->if_type != IFT_CARP && 952 ia->ia_ifp->if_type != IFT_CARP) 953 return (EEXIST); 954 else 955 return (0); 956 } 957 } 958 959 /* 960 * No-one seem to have this prefix route, so we try to insert it. 961 */ 962 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 963 if (!error) 964 target->ia_flags |= IFA_ROUTE; 965 return (error); 966 } 967 968 extern void arp_ifscrub(struct ifnet *ifp, uint32_t addr); 969 970 /* 971 * If there is no other address in the system that can serve a route to the 972 * same prefix, remove the route. Hand over the route to the new address 973 * otherwise. 974 */ 975 static int 976 in_scrubprefix(struct in_ifaddr *target) 977 { 978 INIT_VNET_INET(curvnet); 979 struct in_ifaddr *ia; 980 struct in_addr prefix, mask, p; 981 int error; 982 983 if ((target->ia_flags & IFA_ROUTE) == 0) 984 return (0); 985 986 if (rtinitflags(target)) 987 prefix = target->ia_dstaddr.sin_addr; 988 else { 989 prefix = target->ia_addr.sin_addr; 990 mask = target->ia_sockmask.sin_addr; 991 prefix.s_addr &= mask.s_addr; 992 /* remove arp cache */ 993 arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr); 994 } 995 996 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 997 if (rtinitflags(ia)) 998 p = ia->ia_dstaddr.sin_addr; 999 else { 1000 p = ia->ia_addr.sin_addr; 1001 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1002 } 1003 1004 if (prefix.s_addr != p.s_addr) 1005 continue; 1006 1007 /* 1008 * If we got a matching prefix address, move IFA_ROUTE and 1009 * the route itself to it. Make sure that routing daemons 1010 * get a heads-up. 1011 * 1012 * XXX: a special case for carp(4) interface 1013 */ 1014 if ((ia->ia_flags & IFA_ROUTE) == 0 1015 #ifdef DEV_CARP 1016 && (ia->ia_ifp->if_type != IFT_CARP) 1017 #endif 1018 ) { 1019 rtinit(&(target->ia_ifa), (int)RTM_DELETE, 1020 rtinitflags(target)); 1021 target->ia_flags &= ~IFA_ROUTE; 1022 1023 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 1024 rtinitflags(ia) | RTF_UP); 1025 if (error == 0) 1026 ia->ia_flags |= IFA_ROUTE; 1027 return (error); 1028 } 1029 } 1030 1031 /* 1032 * As no-one seem to have this prefix, we can remove the route. 1033 */ 1034 rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 1035 target->ia_flags &= ~IFA_ROUTE; 1036 return (0); 1037 } 1038 1039 #undef rtinitflags 1040 1041 /* 1042 * Return 1 if the address might be a local broadcast address. 1043 */ 1044 int 1045 in_broadcast(struct in_addr in, struct ifnet *ifp) 1046 { 1047 register struct ifaddr *ifa; 1048 u_long t; 1049 1050 if (in.s_addr == INADDR_BROADCAST || 1051 in.s_addr == INADDR_ANY) 1052 return (1); 1053 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1054 return (0); 1055 t = ntohl(in.s_addr); 1056 /* 1057 * Look through the list of addresses for a match 1058 * with a broadcast address. 1059 */ 1060 #define ia ((struct in_ifaddr *)ifa) 1061 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1062 if (ifa->ifa_addr->sa_family == AF_INET && 1063 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1064 in.s_addr == ia->ia_netbroadcast.s_addr || 1065 /* 1066 * Check for old-style (host 0) broadcast. 1067 */ 1068 t == ia->ia_subnet || t == ia->ia_net) && 1069 /* 1070 * Check for an all one subnetmask. These 1071 * only exist when an interface gets a secondary 1072 * address. 1073 */ 1074 ia->ia_subnetmask != (u_long)0xffffffff) 1075 return (1); 1076 return (0); 1077 #undef ia 1078 } 1079 1080 /* 1081 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 1082 */ 1083 void 1084 in_ifdetach(struct ifnet *ifp) 1085 { 1086 INIT_VNET_INET(ifp->if_vnet); 1087 1088 in_pcbpurgeif0(&V_ripcbinfo, ifp); 1089 in_pcbpurgeif0(&V_udbinfo, ifp); 1090 in_purgemaddrs(ifp); 1091 } 1092 1093 /* 1094 * Delete all IPv4 multicast address records, and associated link-layer 1095 * multicast address records, associated with ifp. 1096 * XXX It looks like domifdetach runs AFTER the link layer cleanup. 1097 * XXX This should not race with ifma_protospec being set during 1098 * a new allocation, if it does, we have bigger problems. 1099 */ 1100 static void 1101 in_purgemaddrs(struct ifnet *ifp) 1102 { 1103 LIST_HEAD(,in_multi) purgeinms; 1104 struct in_multi *inm, *tinm; 1105 struct ifmultiaddr *ifma; 1106 1107 LIST_INIT(&purgeinms); 1108 IN_MULTI_LOCK(); 1109 1110 /* 1111 * Extract list of in_multi associated with the detaching ifp 1112 * which the PF_INET layer is about to release. 1113 * We need to do this as IF_ADDR_LOCK() may be re-acquired 1114 * by code further down. 1115 */ 1116 IF_ADDR_LOCK(ifp); 1117 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1118 if (ifma->ifma_addr->sa_family != AF_INET || 1119 ifma->ifma_protospec == NULL) 1120 continue; 1121 #if 0 1122 KASSERT(ifma->ifma_protospec != NULL, 1123 ("%s: ifma_protospec is NULL", __func__)); 1124 #endif 1125 inm = (struct in_multi *)ifma->ifma_protospec; 1126 LIST_INSERT_HEAD(&purgeinms, inm, inm_link); 1127 } 1128 IF_ADDR_UNLOCK(ifp); 1129 1130 LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) { 1131 LIST_REMOVE(inm, inm_link); 1132 inm_release_locked(inm); 1133 } 1134 igmp_ifdetach(ifp); 1135 1136 IN_MULTI_UNLOCK(); 1137 } 1138 1139 #include <sys/syslog.h> 1140 #include <net/if_dl.h> 1141 #include <netinet/if_ether.h> 1142 1143 struct in_llentry { 1144 struct llentry base; 1145 struct sockaddr_in l3_addr4; 1146 }; 1147 1148 static struct llentry * 1149 in_lltable_new(const struct sockaddr *l3addr, u_int flags) 1150 { 1151 struct in_llentry *lle; 1152 1153 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_DONTWAIT | M_ZERO); 1154 if (lle == NULL) /* NB: caller generates msg */ 1155 return NULL; 1156 1157 callout_init(&lle->base.la_timer, CALLOUT_MPSAFE); 1158 /* 1159 * For IPv4 this will trigger "arpresolve" to generate 1160 * an ARP request. 1161 */ 1162 lle->base.la_expire = time_second; /* mark expired */ 1163 lle->l3_addr4 = *(const struct sockaddr_in *)l3addr; 1164 lle->base.lle_refcnt = 1; 1165 LLE_LOCK_INIT(&lle->base); 1166 return &lle->base; 1167 } 1168 1169 /* 1170 * Deletes an address from the address table. 1171 * This function is called by the timer functions 1172 * such as arptimer() and nd6_llinfo_timer(), and 1173 * the caller does the locking. 1174 */ 1175 static void 1176 in_lltable_free(struct lltable *llt, struct llentry *lle) 1177 { 1178 LLE_WUNLOCK(lle); 1179 LLE_LOCK_DESTROY(lle); 1180 free(lle, M_LLTABLE); 1181 } 1182 1183 static int 1184 in_lltable_rtcheck(struct ifnet *ifp, const struct sockaddr *l3addr) 1185 { 1186 struct rtentry *rt; 1187 1188 KASSERT(l3addr->sa_family == AF_INET, 1189 ("sin_family %d", l3addr->sa_family)); 1190 1191 /* XXX rtalloc1 should take a const param */ 1192 rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0); 1193 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 1194 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n", 1195 inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr)); 1196 if (rt != NULL) 1197 RTFREE_LOCKED(rt); 1198 return (EINVAL); 1199 } 1200 RTFREE_LOCKED(rt); 1201 return 0; 1202 } 1203 1204 /* 1205 * Return NULL if not found or marked for deletion. 1206 * If found return lle read locked. 1207 */ 1208 static struct llentry * 1209 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1210 { 1211 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1212 struct ifnet *ifp = llt->llt_ifp; 1213 struct llentry *lle; 1214 struct llentries *lleh; 1215 u_int hashkey; 1216 1217 IF_AFDATA_LOCK_ASSERT(ifp); 1218 KASSERT(l3addr->sa_family == AF_INET, 1219 ("sin_family %d", l3addr->sa_family)); 1220 1221 hashkey = sin->sin_addr.s_addr; 1222 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 1223 LIST_FOREACH(lle, lleh, lle_next) { 1224 struct sockaddr_in *sa2 = (struct sockaddr_in *)L3_ADDR(lle); 1225 if (lle->la_flags & LLE_DELETED) 1226 continue; 1227 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr) 1228 break; 1229 } 1230 if (lle == NULL) { 1231 #ifdef DIAGNOSTICS 1232 if (flags & LLE_DELETE) 1233 log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle); 1234 #endif 1235 if (!(flags & LLE_CREATE)) 1236 return (NULL); 1237 /* 1238 * A route that covers the given address must have 1239 * been installed 1st because we are doing a resolution, 1240 * verify this. 1241 */ 1242 if (!(flags & LLE_IFADDR) && 1243 in_lltable_rtcheck(ifp, l3addr) != 0) 1244 goto done; 1245 1246 lle = in_lltable_new(l3addr, flags); 1247 if (lle == NULL) { 1248 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 1249 goto done; 1250 } 1251 lle->la_flags = flags & ~LLE_CREATE; 1252 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 1253 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 1254 lle->la_flags |= (LLE_VALID | LLE_STATIC); 1255 } 1256 1257 lle->lle_tbl = llt; 1258 lle->lle_head = lleh; 1259 LIST_INSERT_HEAD(lleh, lle, lle_next); 1260 } else if (flags & LLE_DELETE) { 1261 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 1262 LLE_WLOCK(lle); 1263 lle->la_flags = LLE_DELETED; 1264 LLE_WUNLOCK(lle); 1265 #ifdef DIAGNOSTICS 1266 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 1267 #endif 1268 } 1269 lle = (void *)-1; 1270 1271 } 1272 if (LLE_IS_VALID(lle)) { 1273 if (flags & LLE_EXCLUSIVE) 1274 LLE_WLOCK(lle); 1275 else 1276 LLE_RLOCK(lle); 1277 } 1278 done: 1279 return (lle); 1280 } 1281 1282 static int 1283 in_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 1284 { 1285 #define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle)) 1286 struct ifnet *ifp = llt->llt_ifp; 1287 struct llentry *lle; 1288 /* XXX stack use */ 1289 struct { 1290 struct rt_msghdr rtm; 1291 struct sockaddr_inarp sin; 1292 struct sockaddr_dl sdl; 1293 } arpc; 1294 int error, i; 1295 1296 /* XXXXX 1297 * current IFNET_RLOCK() is mapped to IFNET_WLOCK() 1298 * so it is okay to use this ASSERT, change it when 1299 * IFNET lock is finalized 1300 */ 1301 IFNET_WLOCK_ASSERT(); 1302 1303 error = 0; 1304 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1305 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 1306 struct sockaddr_dl *sdl; 1307 1308 /* skip deleted entries */ 1309 if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID) 1310 continue; 1311 /* Skip if jailed and not a valid IP of the prison. */ 1312 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 1313 continue; 1314 /* 1315 * produce a msg made of: 1316 * struct rt_msghdr; 1317 * struct sockaddr_inarp; (IPv4) 1318 * struct sockaddr_dl; 1319 */ 1320 bzero(&arpc, sizeof(arpc)); 1321 arpc.rtm.rtm_msglen = sizeof(arpc); 1322 arpc.rtm.rtm_version = RTM_VERSION; 1323 arpc.rtm.rtm_type = RTM_GET; 1324 arpc.rtm.rtm_flags = RTF_UP; 1325 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1326 arpc.sin.sin_family = AF_INET; 1327 arpc.sin.sin_len = sizeof(arpc.sin); 1328 arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr; 1329 1330 /* publish */ 1331 if (lle->la_flags & LLE_PUB) { 1332 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1333 /* proxy only */ 1334 if (lle->la_flags & LLE_PROXY) 1335 arpc.sin.sin_other = SIN_PROXY; 1336 } 1337 1338 sdl = &arpc.sdl; 1339 sdl->sdl_family = AF_LINK; 1340 sdl->sdl_len = sizeof(*sdl); 1341 sdl->sdl_alen = ifp->if_addrlen; 1342 sdl->sdl_index = ifp->if_index; 1343 sdl->sdl_type = ifp->if_type; 1344 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1345 1346 arpc.rtm.rtm_rmx.rmx_expire = 1347 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1348 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1349 if (lle->la_flags & LLE_STATIC) 1350 arpc.rtm.rtm_flags |= RTF_STATIC; 1351 arpc.rtm.rtm_index = ifp->if_index; 1352 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1353 if (error) 1354 break; 1355 } 1356 } 1357 return error; 1358 #undef SIN 1359 } 1360 1361 void * 1362 in_domifattach(struct ifnet *ifp) 1363 { 1364 struct in_ifinfo *ii; 1365 struct lltable *llt; 1366 1367 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); 1368 1369 llt = lltable_init(ifp, AF_INET); 1370 if (llt != NULL) { 1371 llt->llt_new = in_lltable_new; 1372 llt->llt_free = in_lltable_free; 1373 llt->llt_rtcheck = in_lltable_rtcheck; 1374 llt->llt_lookup = in_lltable_lookup; 1375 llt->llt_dump = in_lltable_dump; 1376 } 1377 ii->ii_llt = llt; 1378 1379 ii->ii_igmp = igmp_domifattach(ifp); 1380 1381 return ii; 1382 } 1383 1384 void 1385 in_domifdetach(struct ifnet *ifp, void *aux) 1386 { 1387 struct in_ifinfo *ii = (struct in_ifinfo *)aux; 1388 1389 igmp_domifdetach(ifp); 1390 lltable_free(ii->ii_llt); 1391 free(ii, M_IFADDR); 1392 } 1393