1 /* 2 * Copyright (c) 1982, 1986, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)in.c 8.4 (Berkeley) 1/9/95 34 * $FreeBSD: src/sys/netinet/in.c,v 1.44.2.14 2002/11/08 00:45:50 suz Exp $ 35 * $DragonFly: src/sys/netinet/in.c,v 1.41 2008/08/17 05:20:10 sephe Exp $ 36 */ 37 38 #include "opt_bootp.h" 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/sockio.h> 43 #include <sys/malloc.h> 44 #include <sys/proc.h> 45 #include <sys/priv.h> 46 #include <sys/msgport.h> 47 #include <sys/socket.h> 48 49 #include <sys/kernel.h> 50 #include <sys/sysctl.h> 51 #include <sys/thread2.h> 52 53 #include <net/if.h> 54 #include <net/if_types.h> 55 #include <net/route.h> 56 #include <net/netmsg2.h> 57 58 #include <netinet/in.h> 59 #include <netinet/in_var.h> 60 #include <netinet/in_pcb.h> 61 62 #include <netinet/igmp_var.h> 63 64 MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address"); 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 void in_socktrim (struct sockaddr_in *); 72 static int in_ifinit(struct ifnet *, struct in_ifaddr *, 73 const struct sockaddr_in *, int); 74 75 static int in_control_internal(u_long, caddr_t, struct ifnet *, 76 struct thread *); 77 78 static int in_addprefix(struct in_ifaddr *, int); 79 static void in_scrubprefix(struct in_ifaddr *); 80 81 static int subnetsarelocal = 0; 82 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 83 &subnetsarelocal, 0, ""); 84 85 struct in_multihead in_multihead; /* XXX BSS initialization */ 86 87 extern struct inpcbinfo ripcbinfo; 88 extern struct inpcbinfo udbinfo; 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 */ 96 int 97 in_localaddr(struct in_addr in) 98 { 99 u_long i = ntohl(in.s_addr); 100 struct in_ifaddr_container *iac; 101 struct in_ifaddr *ia; 102 103 if (subnetsarelocal) { 104 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 105 ia = iac->ia; 106 107 if ((i & ia->ia_netmask) == ia->ia_net) 108 return (1); 109 } 110 } else { 111 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 112 ia = iac->ia; 113 114 if ((i & ia->ia_subnetmask) == ia->ia_subnet) 115 return (1); 116 } 117 } 118 return (0); 119 } 120 121 /* 122 * Determine whether an IP address is in a reserved set of addresses 123 * that may not be forwarded, or whether datagrams to that destination 124 * may be forwarded. 125 */ 126 int 127 in_canforward(struct in_addr in) 128 { 129 u_long i = ntohl(in.s_addr); 130 u_long net; 131 132 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) 133 return (0); 134 if (IN_CLASSA(i)) { 135 net = i & IN_CLASSA_NET; 136 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 137 return (0); 138 } 139 return (1); 140 } 141 142 /* 143 * Trim a mask in a sockaddr 144 */ 145 static void 146 in_socktrim(struct sockaddr_in *ap) 147 { 148 char *cplim = (char *) &ap->sin_addr; 149 char *cp = (char *) (&ap->sin_addr + 1); 150 151 ap->sin_len = 0; 152 while (--cp >= cplim) 153 if (*cp) { 154 (ap)->sin_len = cp - (char *) (ap) + 1; 155 break; 156 } 157 } 158 159 static int 160 in_mask2len(struct in_addr *mask) 161 { 162 int x, y; 163 u_char *p; 164 165 p = (u_char *)mask; 166 for (x = 0; x < sizeof *mask; x++) { 167 if (p[x] != 0xff) 168 break; 169 } 170 y = 0; 171 if (x < sizeof *mask) { 172 for (y = 0; y < 8; y++) { 173 if ((p[x] & (0x80 >> y)) == 0) 174 break; 175 } 176 } 177 return x * 8 + y; 178 } 179 180 static void 181 in_len2mask(struct in_addr *mask, int len) 182 { 183 int i; 184 u_char *p; 185 186 p = (u_char *)mask; 187 bzero(mask, sizeof *mask); 188 for (i = 0; i < len / 8; i++) 189 p[i] = 0xff; 190 if (len % 8) 191 p[i] = (0xff00 >> (len % 8)) & 0xff; 192 } 193 194 static int in_interfaces; /* number of external internet interfaces */ 195 196 void 197 in_control_dispatch(netmsg_t msg) 198 { 199 int error; 200 201 error = in_control_internal(msg->control.nm_cmd, 202 msg->control.nm_data, 203 msg->control.nm_ifp, 204 msg->control.nm_td); 205 lwkt_replymsg(&msg->lmsg, error); 206 } 207 208 /* 209 * Generic internet control operations (ioctl's). 210 * Ifp is 0 if not an interface-specific ioctl. 211 * 212 * NOTE! td might be NULL. 213 */ 214 /* ARGSUSED */ 215 int 216 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 217 struct thread *td) 218 { 219 struct netmsg_pru_control msg; 220 int error; 221 222 switch (cmd) { 223 case SIOCALIFADDR: 224 case SIOCDLIFADDR: 225 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 226 return error; 227 /* FALLTHROUGH */ 228 case SIOCGLIFADDR: 229 if (!ifp) 230 return EINVAL; 231 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 232 } 233 234 KASSERT(cmd != SIOCALIFADDR && cmd != SIOCDLIFADDR, 235 ("recursive SIOC%cLIFADDR!\n", 236 cmd == SIOCDLIFADDR ? 'D' : 'A')); 237 238 /* 239 * IFADDR alterations are serialized by netisr0 240 */ 241 switch (cmd) { 242 case SIOCSIFDSTADDR: 243 case SIOCSIFBRDADDR: 244 case SIOCSIFADDR: 245 case SIOCSIFNETMASK: 246 case SIOCAIFADDR: 247 case SIOCDIFADDR: 248 netmsg_init(&msg.base, NULL, &curthread->td_msgport, 249 0, in_control_dispatch); 250 msg.nm_cmd = cmd; 251 msg.nm_data = data; 252 msg.nm_ifp = ifp; 253 msg.nm_td = td; 254 lwkt_domsg(cpu_portfn(0), &msg.base.lmsg, 0); 255 error = msg.base.lmsg.ms_error; 256 break; 257 default: 258 error = in_control_internal(cmd, data, ifp, td); 259 break; 260 } 261 return error; 262 } 263 264 static void 265 in_ialink_dispatch(netmsg_t msg) 266 { 267 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 268 struct ifaddr_container *ifac; 269 struct in_ifaddr_container *iac; 270 int cpu = mycpuid; 271 272 crit_enter(); 273 274 ifac = &ia->ia_ifa.ifa_containers[cpu]; 275 ASSERT_IFAC_VALID(ifac); 276 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD) == 0, 277 ("ia is on in_ifaddrheads\n")); 278 279 ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHEAD; 280 iac = &ifac->ifa_proto_u.u_in_ifac; 281 TAILQ_INSERT_TAIL(&in_ifaddrheads[cpu], iac, ia_link); 282 283 crit_exit(); 284 285 ifa_forwardmsg(&msg->lmsg, cpu + 1); 286 } 287 288 static void 289 in_iaunlink_dispatch(netmsg_t msg) 290 { 291 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 292 struct ifaddr_container *ifac; 293 struct in_ifaddr_container *iac; 294 int cpu = mycpuid; 295 296 crit_enter(); 297 298 ifac = &ia->ia_ifa.ifa_containers[cpu]; 299 ASSERT_IFAC_VALID(ifac); 300 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD, 301 ("ia is not on in_ifaddrheads\n")); 302 303 iac = &ifac->ifa_proto_u.u_in_ifac; 304 TAILQ_REMOVE(&in_ifaddrheads[cpu], iac, ia_link); 305 ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHEAD; 306 307 crit_exit(); 308 309 ifa_forwardmsg(&msg->lmsg, cpu + 1); 310 } 311 312 static void 313 in_iahashins_dispatch(netmsg_t msg) 314 { 315 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 316 struct ifaddr_container *ifac; 317 struct in_ifaddr_container *iac; 318 int cpu = mycpuid; 319 320 crit_enter(); 321 322 ifac = &ia->ia_ifa.ifa_containers[cpu]; 323 ASSERT_IFAC_VALID(ifac); 324 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0, 325 ("ia is on in_ifaddrhashtbls\n")); 326 327 ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHASH; 328 iac = &ifac->ifa_proto_u.u_in_ifac; 329 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 330 iac, ia_hash); 331 332 crit_exit(); 333 334 ifa_forwardmsg(&msg->lmsg, cpu + 1); 335 } 336 337 static void 338 in_iahashrem_dispatch(netmsg_t msg) 339 { 340 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 341 struct ifaddr_container *ifac; 342 struct in_ifaddr_container *iac; 343 int cpu = mycpuid; 344 345 crit_enter(); 346 347 ifac = &ia->ia_ifa.ifa_containers[cpu]; 348 ASSERT_IFAC_VALID(ifac); 349 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH, 350 ("ia is not on in_ifaddrhashtbls\n")); 351 352 iac = &ifac->ifa_proto_u.u_in_ifac; 353 LIST_REMOVE(iac, ia_hash); 354 ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHASH; 355 356 crit_exit(); 357 358 ifa_forwardmsg(&msg->lmsg, cpu + 1); 359 } 360 361 static void 362 in_ialink(struct in_ifaddr *ia) 363 { 364 struct netmsg_base msg; 365 366 netmsg_init(&msg, NULL, &curthread->td_msgport, 367 0, in_ialink_dispatch); 368 msg.lmsg.u.ms_resultp = ia; 369 370 ifa_domsg(&msg.lmsg, 0); 371 } 372 373 void 374 in_iaunlink(struct in_ifaddr *ia) 375 { 376 struct netmsg_base msg; 377 378 netmsg_init(&msg, NULL, &curthread->td_msgport, 379 0, in_iaunlink_dispatch); 380 msg.lmsg.u.ms_resultp = ia; 381 382 ifa_domsg(&msg.lmsg, 0); 383 } 384 385 void 386 in_iahash_insert(struct in_ifaddr *ia) 387 { 388 struct netmsg_base msg; 389 390 netmsg_init(&msg, NULL, &curthread->td_msgport, 391 0, in_iahashins_dispatch); 392 msg.lmsg.u.ms_resultp = ia; 393 394 ifa_domsg(&msg.lmsg, 0); 395 } 396 397 void 398 in_iahash_remove(struct in_ifaddr *ia) 399 { 400 struct netmsg_base msg; 401 402 netmsg_init(&msg, NULL, &curthread->td_msgport, 403 0, in_iahashrem_dispatch); 404 msg.lmsg.u.ms_resultp = ia; 405 406 ifa_domsg(&msg.lmsg, 0); 407 } 408 409 static __inline struct in_ifaddr * 410 in_ianext(struct in_ifaddr *oia) 411 { 412 struct ifaddr_container *ifac; 413 struct in_ifaddr_container *iac; 414 415 ifac = &oia->ia_ifa.ifa_containers[mycpuid]; 416 ASSERT_IFAC_VALID(ifac); 417 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD, 418 ("ia is not on in_ifaddrheads\n")); 419 420 iac = &ifac->ifa_proto_u.u_in_ifac; 421 iac = TAILQ_NEXT(iac, ia_link); 422 if (iac != NULL) 423 return iac->ia; 424 else 425 return NULL; 426 } 427 428 static int 429 in_control_internal(u_long cmd, caddr_t data, struct ifnet *ifp, 430 struct thread *td) 431 { 432 struct ifreq *ifr = (struct ifreq *)data; 433 struct in_ifaddr *ia = NULL; 434 struct in_addr dst; 435 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 436 struct ifaddr_container *ifac; 437 struct in_ifaddr_container *iac; 438 struct sockaddr_in oldaddr; 439 int hostIsNew, iaIsNew, maskIsNew, ifpWasUp; 440 int error = 0; 441 442 iaIsNew = 0; 443 ifpWasUp = 0; 444 445 /* 446 * Find address for this interface, if it exists. 447 * 448 * If an alias address was specified, find that one instead of 449 * the first one on the interface, if possible 450 */ 451 if (ifp) { 452 struct in_ifaddr *iap; 453 454 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 455 LIST_FOREACH(iac, INADDR_HASH(dst.s_addr), ia_hash) { 456 iap = iac->ia; 457 if (iap->ia_ifp == ifp && 458 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 459 ia = iap; 460 break; 461 } 462 } 463 if (ia == NULL) { 464 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], 465 ifa_link) { 466 iap = ifatoia(ifac->ifa); 467 if (iap->ia_addr.sin_family == AF_INET) { 468 ia = iap; 469 break; 470 } 471 } 472 } 473 474 if (ifp->if_flags & IFF_UP) 475 ifpWasUp = 1; 476 } 477 478 switch (cmd) { 479 case SIOCAIFADDR: 480 case SIOCDIFADDR: 481 if (ifp == NULL) 482 return (EADDRNOTAVAIL); 483 if (ifra->ifra_addr.sin_family == AF_INET) { 484 while (ia != NULL) { 485 if (ia->ia_ifp == ifp && 486 ia->ia_addr.sin_addr.s_addr == 487 ifra->ifra_addr.sin_addr.s_addr) 488 break; 489 ia = in_ianext(ia); 490 } 491 if ((ifp->if_flags & IFF_POINTOPOINT) && 492 cmd == SIOCAIFADDR && 493 ifra->ifra_dstaddr.sin_addr.s_addr == INADDR_ANY) { 494 return EDESTADDRREQ; 495 } 496 } 497 if (cmd == SIOCDIFADDR && ia == NULL) 498 return (EADDRNOTAVAIL); 499 /* FALLTHROUGH */ 500 case SIOCSIFADDR: 501 case SIOCSIFNETMASK: 502 case SIOCSIFDSTADDR: 503 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 504 return error; 505 506 if (ifp == NULL) 507 return (EADDRNOTAVAIL); 508 509 if (cmd == SIOCSIFDSTADDR && 510 (ifp->if_flags & IFF_POINTOPOINT) == 0) 511 return (EINVAL); 512 513 if (ia == NULL) { 514 struct ifaddr *ifa; 515 int i; 516 517 ia = ifa_create(sizeof(*ia), M_WAITOK); 518 ifa = &ia->ia_ifa; 519 520 /* 521 * Setup per-CPU information 522 */ 523 for (i = 0; i < ncpus; ++i) { 524 ifac = &ifa->ifa_containers[i]; 525 iac = &ifac->ifa_proto_u.u_in_ifac; 526 iac->ia = ia; 527 iac->ia_ifac = ifac; 528 } 529 530 /* 531 * Protect from NETISR_IP traversing address list 532 * while we're modifying it. 533 */ 534 crit_enter(); 535 536 in_ialink(ia); 537 ifa_iflink(ifa, ifp, 1); 538 539 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 540 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 541 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 542 ia->ia_sockmask.sin_len = 8; 543 ia->ia_sockmask.sin_family = AF_INET; 544 if (ifp->if_flags & IFF_BROADCAST) { 545 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr; 546 ia->ia_broadaddr.sin_family = AF_INET; 547 } 548 ia->ia_ifp = ifp; 549 if (!(ifp->if_flags & IFF_LOOPBACK)) 550 in_interfaces++; 551 iaIsNew = 1; 552 553 crit_exit(); 554 } 555 break; 556 557 case SIOCSIFBRDADDR: 558 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 559 return error; 560 /* FALLTHROUGH */ 561 562 case SIOCGIFADDR: 563 case SIOCGIFNETMASK: 564 case SIOCGIFDSTADDR: 565 case SIOCGIFBRDADDR: 566 if (ia == NULL) 567 return (EADDRNOTAVAIL); 568 break; 569 } 570 571 switch (cmd) { 572 case SIOCGIFADDR: 573 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 574 return (0); 575 576 case SIOCGIFBRDADDR: 577 if ((ifp->if_flags & IFF_BROADCAST) == 0) 578 return (EINVAL); 579 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 580 return (0); 581 582 case SIOCGIFDSTADDR: 583 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 584 return (EINVAL); 585 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 586 return (0); 587 588 case SIOCGIFNETMASK: 589 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 590 return (0); 591 592 case SIOCSIFDSTADDR: 593 KKASSERT(ifp->if_flags & IFF_POINTOPOINT); 594 595 oldaddr = ia->ia_dstaddr; 596 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 597 if (ifp->if_ioctl != NULL) { 598 ifnet_serialize_all(ifp); 599 error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia, 600 td->td_proc->p_ucred); 601 ifnet_deserialize_all(ifp); 602 if (error) { 603 ia->ia_dstaddr = oldaddr; 604 return (error); 605 } 606 } 607 if (ia->ia_flags & IFA_ROUTE) { 608 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 609 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 610 ia->ia_ifa.ifa_dstaddr = 611 (struct sockaddr *)&ia->ia_dstaddr; 612 rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP); 613 } 614 return (0); 615 616 case SIOCSIFBRDADDR: 617 if ((ifp->if_flags & IFF_BROADCAST) == 0) 618 return (EINVAL); 619 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 620 return (0); 621 622 case SIOCSIFADDR: 623 error = in_ifinit(ifp, ia, 624 (const struct sockaddr_in *)&ifr->ifr_addr, 1); 625 if (error != 0 && iaIsNew) 626 break; 627 if (error == 0) { 628 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 629 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 630 &ia->ia_ifa); 631 } 632 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) { 633 /* 634 * Interface is brought up by in_ifinit() 635 * (via ifp->if_ioctl). We act as if the 636 * interface got IFF_UP flag turned on. 637 */ 638 if_up(ifp); 639 } 640 return (0); 641 642 case SIOCSIFNETMASK: 643 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 644 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 645 return (0); 646 647 case SIOCAIFADDR: 648 maskIsNew = 0; 649 hostIsNew = 1; 650 error = 0; 651 if (ia->ia_addr.sin_family == AF_INET) { 652 if (ifra->ifra_addr.sin_len == 0) { 653 ifra->ifra_addr = ia->ia_addr; 654 hostIsNew = 0; 655 } else if (ifra->ifra_addr.sin_addr.s_addr == 656 ia->ia_addr.sin_addr.s_addr) { 657 hostIsNew = 0; 658 } 659 } 660 if (ifra->ifra_mask.sin_len) { 661 in_ifscrub(ifp, ia); 662 ia->ia_sockmask = ifra->ifra_mask; 663 ia->ia_sockmask.sin_family = AF_INET; 664 ia->ia_subnetmask = 665 ntohl(ia->ia_sockmask.sin_addr.s_addr); 666 maskIsNew = 1; 667 } 668 if ((ifp->if_flags & IFF_POINTOPOINT) && 669 ifra->ifra_dstaddr.sin_family == AF_INET) { 670 in_ifscrub(ifp, ia); 671 ia->ia_dstaddr = ifra->ifra_dstaddr; 672 maskIsNew = 1; /* We lie; but the effect's the same */ 673 } 674 if (ifra->ifra_addr.sin_family == AF_INET && 675 (hostIsNew || maskIsNew)) 676 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 677 678 if (error != 0 && iaIsNew) 679 break; 680 681 if ((ifp->if_flags & IFF_BROADCAST) && 682 ifra->ifra_broadaddr.sin_family == AF_INET) 683 ia->ia_broadaddr = ifra->ifra_broadaddr; 684 if (error == 0) { 685 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 686 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 687 &ia->ia_ifa); 688 } 689 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) { 690 /* See the comment in SIOCSIFADDR */ 691 if_up(ifp); 692 } 693 return (error); 694 695 case SIOCDIFADDR: 696 /* 697 * in_ifscrub kills the interface route. 698 */ 699 in_ifscrub(ifp, ia); 700 /* 701 * in_ifadown gets rid of all the rest of 702 * the routes. This is not quite the right 703 * thing to do, but at least if we are running 704 * a routing process they will come back. 705 */ 706 in_ifadown(&ia->ia_ifa, 1); 707 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE, 708 &ia->ia_ifa); 709 error = 0; 710 break; 711 712 default: 713 if (ifp == NULL || ifp->if_ioctl == NULL) 714 return (EOPNOTSUPP); 715 ifnet_serialize_all(ifp); 716 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred); 717 ifnet_deserialize_all(ifp); 718 return (error); 719 } 720 721 KKASSERT(cmd == SIOCDIFADDR || 722 ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && iaIsNew)); 723 724 ifa_ifunlink(&ia->ia_ifa, ifp); 725 in_iaunlink(ia); 726 727 if (cmd == SIOCDIFADDR) { 728 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 729 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) 730 in_iahash_remove(ia); 731 } 732 #ifdef INVARIANTS 733 else { 734 /* 735 * If cmd is SIOCSIFADDR or SIOCAIFADDR, in_ifinit() has 736 * already taken care of the deletion from hash table 737 */ 738 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 739 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0, 740 ("SIOC%cIFADDR failed on new ia, " 741 "but the new ia is still in hash table\n", 742 cmd == SIOCSIFADDR ? 'S' : 'A')); 743 } 744 #endif 745 746 ifa_destroy(&ia->ia_ifa); 747 748 if ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && 749 !ifpWasUp && (ifp->if_flags & IFF_UP)) { 750 /* 751 * Though the address assignment failed, the 752 * interface is brought up by in_ifinit() 753 * (via ifp->if_ioctl). With the hope that 754 * the interface has some valid addresses, we 755 * act as if IFF_UP flag was just set on the 756 * interface. 757 * 758 * NOTE: 759 * This could only be done after the failed 760 * address is unlinked from the global address 761 * list. 762 */ 763 if_up(ifp); 764 } 765 766 return (error); 767 } 768 769 /* 770 * SIOC[GAD]LIFADDR. 771 * SIOCGLIFADDR: get first address. (?!?) 772 * SIOCGLIFADDR with IFLR_PREFIX: 773 * get first address that matches the specified prefix. 774 * SIOCALIFADDR: add the specified address. 775 * SIOCALIFADDR with IFLR_PREFIX: 776 * EINVAL since we can't deduce hostid part of the address. 777 * SIOCDLIFADDR: delete the specified address. 778 * SIOCDLIFADDR with IFLR_PREFIX: 779 * delete the first address that matches the specified prefix. 780 * return values: 781 * EINVAL on invalid parameters 782 * EADDRNOTAVAIL on prefix match failed/specified address not found 783 * other values may be returned from in_ioctl() 784 * 785 * NOTE! td might be NULL. 786 */ 787 static int 788 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 789 struct thread *td) 790 { 791 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 792 793 /* sanity checks */ 794 if (!data || !ifp) { 795 panic("invalid argument to in_lifaddr_ioctl"); 796 /*NOTRECHED*/ 797 } 798 799 switch (cmd) { 800 case SIOCGLIFADDR: 801 /* address must be specified on GET with IFLR_PREFIX */ 802 if ((iflr->flags & IFLR_PREFIX) == 0) 803 break; 804 /*FALLTHROUGH*/ 805 case SIOCALIFADDR: 806 case SIOCDLIFADDR: 807 /* address must be specified on ADD and DELETE */ 808 if (iflr->addr.ss_family != AF_INET) 809 return EINVAL; 810 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 811 return EINVAL; 812 /* XXX need improvement */ 813 if (iflr->dstaddr.ss_family 814 && iflr->dstaddr.ss_family != AF_INET) 815 return EINVAL; 816 if (iflr->dstaddr.ss_family 817 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 818 return EINVAL; 819 break; 820 default: /*shouldn't happen*/ 821 return EOPNOTSUPP; 822 } 823 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 824 return EINVAL; 825 826 switch (cmd) { 827 case SIOCALIFADDR: 828 { 829 struct in_aliasreq ifra; 830 831 if (iflr->flags & IFLR_PREFIX) 832 return EINVAL; 833 834 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 835 bzero(&ifra, sizeof ifra); 836 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name); 837 838 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 839 840 if (iflr->dstaddr.ss_family) { /*XXX*/ 841 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 842 iflr->dstaddr.ss_len); 843 } 844 845 ifra.ifra_mask.sin_family = AF_INET; 846 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 847 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 848 849 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 850 } 851 case SIOCGLIFADDR: 852 case SIOCDLIFADDR: 853 { 854 struct ifaddr_container *ifac; 855 struct in_ifaddr *ia; 856 struct in_addr mask, candidate, match; 857 struct sockaddr_in *sin; 858 int cmp; 859 860 bzero(&mask, sizeof mask); 861 if (iflr->flags & IFLR_PREFIX) { 862 /* lookup a prefix rather than address. */ 863 in_len2mask(&mask, iflr->prefixlen); 864 865 sin = (struct sockaddr_in *)&iflr->addr; 866 match.s_addr = sin->sin_addr.s_addr; 867 match.s_addr &= mask.s_addr; 868 869 /* if you set extra bits, that's wrong */ 870 if (match.s_addr != sin->sin_addr.s_addr) 871 return EINVAL; 872 873 cmp = 1; 874 } else { 875 if (cmd == SIOCGLIFADDR) { 876 /* on getting an address, take the 1st match */ 877 match.s_addr = 0; /* gcc4 warning */ 878 cmp = 0; /*XXX*/ 879 } else { 880 /* on deleting an address, do exact match */ 881 in_len2mask(&mask, 32); 882 sin = (struct sockaddr_in *)&iflr->addr; 883 match.s_addr = sin->sin_addr.s_addr; 884 885 cmp = 1; 886 } 887 } 888 889 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 890 struct ifaddr *ifa = ifac->ifa; 891 892 if (ifa->ifa_addr->sa_family != AF_INET6) 893 continue; 894 if (!cmp) 895 break; 896 candidate.s_addr = 897 ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 898 candidate.s_addr &= mask.s_addr; 899 if (candidate.s_addr == match.s_addr) 900 break; 901 } 902 if (ifac == NULL) 903 return EADDRNOTAVAIL; 904 ia = (struct in_ifaddr *)(ifac->ifa); 905 906 if (cmd == SIOCGLIFADDR) { 907 /* fill in the if_laddrreq structure */ 908 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 909 910 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 911 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 912 ia->ia_dstaddr.sin_len); 913 } else 914 bzero(&iflr->dstaddr, sizeof iflr->dstaddr); 915 916 iflr->prefixlen = 917 in_mask2len(&ia->ia_sockmask.sin_addr); 918 919 iflr->flags = 0; /*XXX*/ 920 921 return 0; 922 } else { 923 struct in_aliasreq ifra; 924 925 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 926 bzero(&ifra, sizeof ifra); 927 bcopy(iflr->iflr_name, ifra.ifra_name, 928 sizeof ifra.ifra_name); 929 930 bcopy(&ia->ia_addr, &ifra.ifra_addr, 931 ia->ia_addr.sin_len); 932 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 933 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 934 ia->ia_dstaddr.sin_len); 935 } 936 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 937 ia->ia_sockmask.sin_len); 938 939 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 940 ifp, td); 941 } 942 } 943 } 944 945 return EOPNOTSUPP; /*just for safety*/ 946 } 947 948 /* 949 * Delete any existing route for an interface. 950 */ 951 void 952 in_ifscrub(struct ifnet *ifp __unused, struct in_ifaddr *ia) 953 { 954 in_scrubprefix(ia); 955 } 956 957 /* 958 * Initialize an interface's internet address 959 * and routing table entry. 960 */ 961 static int 962 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, 963 const struct sockaddr_in *sin, int scrub) 964 { 965 u_long i = ntohl(sin->sin_addr.s_addr); 966 struct sockaddr_in oldaddr; 967 struct ifaddr_container *ifac; 968 int flags = RTF_UP, error = 0; 969 int was_hash = 0; 970 971 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 972 oldaddr = ia->ia_addr; 973 974 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) { 975 was_hash = 1; 976 in_iahash_remove(ia); 977 } 978 979 ia->ia_addr = *sin; 980 if (ia->ia_addr.sin_family == AF_INET) 981 in_iahash_insert(ia); 982 983 /* 984 * Give the interface a chance to initialize 985 * if this is its first address, 986 * and to validate the address if necessary. 987 */ 988 if (ifp->if_ioctl != NULL) { 989 ifnet_serialize_all(ifp); 990 error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL); 991 ifnet_deserialize_all(ifp); 992 if (error) 993 goto fail; 994 } 995 996 /* 997 * Delete old route, if requested. 998 */ 999 if (scrub) { 1000 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 1001 in_ifscrub(ifp, ia); 1002 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1003 } 1004 1005 /* 1006 * Calculate netmask/subnetmask. 1007 */ 1008 if (IN_CLASSA(i)) 1009 ia->ia_netmask = IN_CLASSA_NET; 1010 else if (IN_CLASSB(i)) 1011 ia->ia_netmask = IN_CLASSB_NET; 1012 else 1013 ia->ia_netmask = IN_CLASSC_NET; 1014 /* 1015 * The subnet mask usually includes at least the standard network part, 1016 * but may may be smaller in the case of supernetting. 1017 * If it is set, we believe it. 1018 */ 1019 if (ia->ia_subnetmask == 0) { 1020 ia->ia_subnetmask = ia->ia_netmask; 1021 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 1022 } else { 1023 ia->ia_netmask &= ia->ia_subnetmask; 1024 } 1025 ia->ia_net = i & ia->ia_netmask; 1026 ia->ia_subnet = i & ia->ia_subnetmask; 1027 in_socktrim(&ia->ia_sockmask); 1028 1029 /* 1030 * Add route for the network. 1031 */ 1032 ia->ia_ifa.ifa_metric = ifp->if_metric; 1033 if (ifp->if_flags & IFF_BROADCAST) { 1034 ia->ia_broadaddr.sin_addr.s_addr = 1035 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 1036 ia->ia_netbroadcast.s_addr = 1037 htonl(ia->ia_net | ~ ia->ia_netmask); 1038 } else if (ifp->if_flags & IFF_LOOPBACK) { 1039 ia->ia_dstaddr = ia->ia_addr; 1040 flags |= RTF_HOST; 1041 } else if (ifp->if_flags & IFF_POINTOPOINT) { 1042 if (ia->ia_dstaddr.sin_family != AF_INET) 1043 return (0); 1044 flags |= RTF_HOST; 1045 } 1046 1047 /*- 1048 * Don't add host routes for interface addresses of 1049 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it 1050 * possible to assign several such address pairs with consistent 1051 * results (no host route) and is required by BOOTP. 1052 * 1053 * XXX: This is ugly ! There should be a way for the caller to 1054 * say that they don't want a host route. 1055 */ 1056 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY || 1057 ia->ia_netmask != IN_CLASSA_NET || 1058 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) { 1059 error = in_addprefix(ia, flags); 1060 if (error) 1061 goto fail; 1062 } 1063 1064 /* 1065 * If the interface supports multicast, join the "all hosts" 1066 * multicast group on that interface. 1067 */ 1068 if (ifp->if_flags & IFF_MULTICAST) { 1069 struct in_addr addr; 1070 1071 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 1072 in_addmulti(&addr, ifp); 1073 } 1074 return (0); 1075 fail: 1076 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) 1077 in_iahash_remove(ia); 1078 1079 ia->ia_addr = oldaddr; 1080 if (was_hash) 1081 in_iahash_insert(ia); 1082 return (error); 1083 } 1084 1085 #define rtinitflags(x) \ 1086 (((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) \ 1087 ? RTF_HOST : 0) 1088 1089 /* 1090 * Add a route to prefix ("connected route" in cisco terminology). 1091 * Do nothing, if there are some interface addresses with the same 1092 * prefix already. This function assumes that the 'target' parent 1093 * interface is UP. 1094 */ 1095 static int 1096 in_addprefix(struct in_ifaddr *target, int flags) 1097 { 1098 struct in_ifaddr_container *iac; 1099 struct in_addr prefix, mask; 1100 int error; 1101 1102 mask = target->ia_sockmask.sin_addr; 1103 if (flags & RTF_HOST) { 1104 prefix = target->ia_dstaddr.sin_addr; 1105 } else { 1106 prefix = target->ia_addr.sin_addr; 1107 prefix.s_addr &= mask.s_addr; 1108 } 1109 1110 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 1111 struct in_ifaddr *ia = iac->ia; 1112 struct in_addr p; 1113 1114 /* Don't test against self */ 1115 if (ia == target) 1116 continue; 1117 1118 /* The tested address does not own a route entry */ 1119 if ((ia->ia_flags & IFA_ROUTE) == 0) 1120 continue; 1121 1122 /* Prefix test */ 1123 if (rtinitflags(ia)) { 1124 p = ia->ia_dstaddr.sin_addr; 1125 } else { 1126 p = ia->ia_addr.sin_addr; 1127 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1128 } 1129 if (prefix.s_addr != p.s_addr) 1130 continue; 1131 1132 /* 1133 * If the to-be-added address and the curretly being 1134 * tested address are not host addresses, we need to 1135 * take subnetmask into consideration. 1136 */ 1137 if (!(flags & RTF_HOST) && !rtinitflags(ia) && 1138 mask.s_addr != ia->ia_sockmask.sin_addr.s_addr) 1139 continue; 1140 1141 /* 1142 * If we got a matching prefix route inserted by other 1143 * interface address, we don't need to bother. 1144 */ 1145 return 0; 1146 } 1147 1148 /* 1149 * No one seem to have prefix route; insert it. 1150 */ 1151 error = rtinit(&target->ia_ifa, RTM_ADD, flags); 1152 if (!error) 1153 target->ia_flags |= IFA_ROUTE; 1154 return error; 1155 } 1156 1157 /* 1158 * Remove a route to prefix ("connected route" in cisco terminology). 1159 * Re-installs the route by using another interface address, if there's 1160 * one with the same prefix (otherwise we lose the route mistakenly). 1161 */ 1162 static void 1163 in_scrubprefix(struct in_ifaddr *target) 1164 { 1165 struct in_ifaddr_container *iac; 1166 struct in_addr prefix, mask; 1167 int error; 1168 1169 if ((target->ia_flags & IFA_ROUTE) == 0) 1170 return; 1171 1172 mask = target->ia_sockmask.sin_addr; 1173 if (rtinitflags(target)) { 1174 prefix = target->ia_dstaddr.sin_addr; 1175 } else { 1176 prefix = target->ia_addr.sin_addr; 1177 prefix.s_addr &= mask.s_addr; 1178 } 1179 1180 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 1181 struct in_ifaddr *ia = iac->ia; 1182 struct in_addr p; 1183 1184 /* Don't test against self */ 1185 if (ia == target) 1186 continue; 1187 1188 /* The tested address already owns a route entry */ 1189 if (ia->ia_flags & IFA_ROUTE) 1190 continue; 1191 1192 /* 1193 * The prefix route of the tested address should 1194 * never be installed if its parent interface is 1195 * not UP yet. 1196 */ 1197 if ((ia->ia_ifp->if_flags & IFF_UP) == 0) 1198 continue; 1199 1200 /* Prefix test */ 1201 if (rtinitflags(ia)) { 1202 p = ia->ia_dstaddr.sin_addr; 1203 } else { 1204 p = ia->ia_addr.sin_addr; 1205 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1206 } 1207 if (prefix.s_addr != p.s_addr) 1208 continue; 1209 1210 /* 1211 * We don't need to test subnetmask here, as what we do 1212 * in in_addprefix(), since if the the tested address's 1213 * parent interface is UP, the tested address should own 1214 * a prefix route entry and we would never reach here. 1215 */ 1216 1217 /* 1218 * If we got a matching prefix route, move IFA_ROUTE to him 1219 */ 1220 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target)); 1221 target->ia_flags &= ~IFA_ROUTE; 1222 1223 error = rtinit(&ia->ia_ifa, RTM_ADD, rtinitflags(ia) | RTF_UP); 1224 if (!error) 1225 ia->ia_flags |= IFA_ROUTE; 1226 return; 1227 } 1228 1229 /* 1230 * No candidates for this prefix route; just remove it. 1231 */ 1232 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target)); 1233 target->ia_flags &= ~IFA_ROUTE; 1234 } 1235 1236 #undef rtinitflags 1237 1238 /* 1239 * Return 1 if the address might be a local broadcast address. 1240 */ 1241 int 1242 in_broadcast(struct in_addr in, struct ifnet *ifp) 1243 { 1244 struct ifaddr_container *ifac; 1245 u_long t; 1246 1247 if (in.s_addr == INADDR_BROADCAST || 1248 in.s_addr == INADDR_ANY) 1249 return 1; 1250 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1251 return 0; 1252 t = ntohl(in.s_addr); 1253 /* 1254 * Look through the list of addresses for a match 1255 * with a broadcast address. 1256 */ 1257 #define ia ((struct in_ifaddr *)ifa) 1258 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1259 struct ifaddr *ifa = ifac->ifa; 1260 1261 if (ifa->ifa_addr->sa_family == AF_INET && 1262 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1263 in.s_addr == ia->ia_netbroadcast.s_addr || 1264 /* 1265 * Check for old-style (host 0) broadcast. 1266 */ 1267 t == ia->ia_subnet || t == ia->ia_net) && 1268 /* 1269 * Check for an all one subnetmask. These 1270 * only exist when an interface gets a secondary 1271 * address. 1272 */ 1273 ia->ia_subnetmask != (u_long)0xffffffff) 1274 return 1; 1275 } 1276 return (0); 1277 #undef ia 1278 } 1279 /* 1280 * Add an address to the list of IP multicast addresses for a given interface. 1281 */ 1282 struct in_multi * 1283 in_addmulti(struct in_addr *ap, struct ifnet *ifp) 1284 { 1285 struct in_multi *inm; 1286 int error; 1287 struct sockaddr_in sin; 1288 struct ifmultiaddr *ifma; 1289 1290 /* 1291 * Call generic routine to add membership or increment 1292 * refcount. It wants addresses in the form of a sockaddr, 1293 * so we build one here (being careful to zero the unused bytes). 1294 */ 1295 bzero(&sin, sizeof sin); 1296 sin.sin_family = AF_INET; 1297 sin.sin_len = sizeof sin; 1298 sin.sin_addr = *ap; 1299 crit_enter(); 1300 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 1301 if (error) { 1302 crit_exit(); 1303 return 0; 1304 } 1305 1306 /* 1307 * If ifma->ifma_protospec is null, then if_addmulti() created 1308 * a new record. Otherwise, we are done. 1309 */ 1310 if (ifma->ifma_protospec != 0) { 1311 crit_exit(); 1312 return ifma->ifma_protospec; 1313 } 1314 1315 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 1316 at interrupt time? If so, need to fix if_addmulti. XXX */ 1317 inm = kmalloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO); 1318 inm->inm_addr = *ap; 1319 inm->inm_ifp = ifp; 1320 inm->inm_ifma = ifma; 1321 ifma->ifma_protospec = inm; 1322 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 1323 1324 /* 1325 * Let IGMP know that we have joined a new IP multicast group. 1326 */ 1327 igmp_joingroup(inm); 1328 crit_exit(); 1329 return (inm); 1330 } 1331 1332 /* 1333 * Delete a multicast address record. 1334 */ 1335 void 1336 in_delmulti(struct in_multi *inm) 1337 { 1338 struct ifmultiaddr *ifma; 1339 struct in_multi my_inm; 1340 1341 crit_enter(); 1342 ifma = inm->inm_ifma; 1343 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 1344 if (ifma->ifma_refcount == 1) { 1345 /* 1346 * No remaining claims to this record; let IGMP know that 1347 * we are leaving the multicast group. 1348 * But do it after the if_delmulti() which might reset 1349 * the interface and nuke the packet. 1350 */ 1351 my_inm = *inm ; 1352 ifma->ifma_protospec = 0; 1353 LIST_REMOVE(inm, inm_link); 1354 kfree(inm, M_IPMADDR); 1355 } 1356 /* XXX - should be separate API for when we have an ifma? */ 1357 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1358 if (my_inm.inm_ifp != NULL) 1359 igmp_leavegroup(&my_inm); 1360 crit_exit(); 1361 } 1362 1363 void 1364 in_ifdetach(struct ifnet *ifp) 1365 { 1366 in_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp); 1367 in_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp); 1368 } 1369