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 "Count all internet addresses of subnets of the local net as local"); 85 86 struct in_multihead in_multihead; /* XXX BSS initialization */ 87 88 extern struct inpcbinfo ripcbinfo; 89 extern struct inpcbinfo udbinfo; 90 91 /* 92 * Return 1 if an internet address is for a ``local'' host 93 * (one to which we have a connection). If subnetsarelocal 94 * is true, this includes other subnets of the local net. 95 * Otherwise, it includes only the directly-connected (sub)nets. 96 */ 97 int 98 in_localaddr(struct in_addr in) 99 { 100 u_long i = ntohl(in.s_addr); 101 struct in_ifaddr_container *iac; 102 struct in_ifaddr *ia; 103 104 if (subnetsarelocal) { 105 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 106 ia = iac->ia; 107 108 if ((i & ia->ia_netmask) == ia->ia_net) 109 return (1); 110 } 111 } else { 112 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 113 ia = iac->ia; 114 115 if ((i & ia->ia_subnetmask) == ia->ia_subnet) 116 return (1); 117 } 118 } 119 return (0); 120 } 121 122 /* 123 * Determine whether an IP address is in a reserved set of addresses 124 * that may not be forwarded, or whether datagrams to that destination 125 * may be forwarded. 126 */ 127 int 128 in_canforward(struct in_addr in) 129 { 130 u_long i = ntohl(in.s_addr); 131 u_long net; 132 133 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) 134 return (0); 135 if (IN_CLASSA(i)) { 136 net = i & IN_CLASSA_NET; 137 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 138 return (0); 139 } 140 return (1); 141 } 142 143 /* 144 * Trim a mask in a sockaddr 145 */ 146 static void 147 in_socktrim(struct sockaddr_in *ap) 148 { 149 char *cplim = (char *) &ap->sin_addr; 150 char *cp = (char *) (&ap->sin_addr + 1); 151 152 ap->sin_len = 0; 153 while (--cp >= cplim) 154 if (*cp) { 155 (ap)->sin_len = cp - (char *) (ap) + 1; 156 break; 157 } 158 } 159 160 static int 161 in_mask2len(struct in_addr *mask) 162 { 163 int x, y; 164 u_char *p; 165 166 p = (u_char *)mask; 167 for (x = 0; x < sizeof *mask; x++) { 168 if (p[x] != 0xff) 169 break; 170 } 171 y = 0; 172 if (x < sizeof *mask) { 173 for (y = 0; y < 8; y++) { 174 if ((p[x] & (0x80 >> y)) == 0) 175 break; 176 } 177 } 178 return x * 8 + y; 179 } 180 181 static void 182 in_len2mask(struct in_addr *mask, int len) 183 { 184 int i; 185 u_char *p; 186 187 p = (u_char *)mask; 188 bzero(mask, sizeof *mask); 189 for (i = 0; i < len / 8; i++) 190 p[i] = 0xff; 191 if (len % 8) 192 p[i] = (0xff00 >> (len % 8)) & 0xff; 193 } 194 195 static int in_interfaces; /* number of external internet interfaces */ 196 197 void 198 in_control_dispatch(netmsg_t msg) 199 { 200 int error; 201 202 error = in_control_internal(msg->control.nm_cmd, 203 msg->control.nm_data, 204 msg->control.nm_ifp, 205 msg->control.nm_td); 206 lwkt_replymsg(&msg->lmsg, error); 207 } 208 209 /* 210 * Generic internet control operations (ioctl's). 211 * Ifp is 0 if not an interface-specific ioctl. 212 * 213 * NOTE! td might be NULL. 214 */ 215 /* ARGSUSED */ 216 int 217 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 218 struct thread *td) 219 { 220 struct netmsg_pru_control msg; 221 int error; 222 223 switch (cmd) { 224 case SIOCALIFADDR: 225 case SIOCDLIFADDR: 226 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 227 return error; 228 /* FALLTHROUGH */ 229 case SIOCGLIFADDR: 230 if (!ifp) 231 return EINVAL; 232 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 233 } 234 235 KASSERT(cmd != SIOCALIFADDR && cmd != SIOCDLIFADDR, 236 ("recursive SIOC%cLIFADDR!\n", 237 cmd == SIOCDLIFADDR ? 'D' : 'A')); 238 239 /* 240 * IFADDR alterations are serialized by netisr0 241 */ 242 switch (cmd) { 243 case SIOCSIFDSTADDR: 244 case SIOCSIFBRDADDR: 245 case SIOCSIFADDR: 246 case SIOCSIFNETMASK: 247 case SIOCAIFADDR: 248 case SIOCDIFADDR: 249 netmsg_init(&msg.base, NULL, &curthread->td_msgport, 250 0, in_control_dispatch); 251 msg.nm_cmd = cmd; 252 msg.nm_data = data; 253 msg.nm_ifp = ifp; 254 msg.nm_td = td; 255 lwkt_domsg(cpu_portfn(0), &msg.base.lmsg, 0); 256 error = msg.base.lmsg.ms_error; 257 break; 258 default: 259 error = in_control_internal(cmd, data, ifp, td); 260 break; 261 } 262 return error; 263 } 264 265 static void 266 in_ialink_dispatch(netmsg_t msg) 267 { 268 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 269 struct ifaddr_container *ifac; 270 struct in_ifaddr_container *iac; 271 int cpu = mycpuid; 272 273 crit_enter(); 274 275 ifac = &ia->ia_ifa.ifa_containers[cpu]; 276 ASSERT_IFAC_VALID(ifac); 277 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD) == 0, 278 ("ia is on in_ifaddrheads\n")); 279 280 ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHEAD; 281 iac = &ifac->ifa_proto_u.u_in_ifac; 282 TAILQ_INSERT_TAIL(&in_ifaddrheads[cpu], iac, ia_link); 283 284 crit_exit(); 285 286 ifa_forwardmsg(&msg->lmsg, cpu + 1); 287 } 288 289 static void 290 in_iaunlink_dispatch(netmsg_t msg) 291 { 292 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 293 struct ifaddr_container *ifac; 294 struct in_ifaddr_container *iac; 295 int cpu = mycpuid; 296 297 crit_enter(); 298 299 ifac = &ia->ia_ifa.ifa_containers[cpu]; 300 ASSERT_IFAC_VALID(ifac); 301 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD, 302 ("ia is not on in_ifaddrheads\n")); 303 304 iac = &ifac->ifa_proto_u.u_in_ifac; 305 TAILQ_REMOVE(&in_ifaddrheads[cpu], iac, ia_link); 306 ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHEAD; 307 308 crit_exit(); 309 310 ifa_forwardmsg(&msg->lmsg, cpu + 1); 311 } 312 313 static void 314 in_iahashins_dispatch(netmsg_t msg) 315 { 316 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 317 struct ifaddr_container *ifac; 318 struct in_ifaddr_container *iac; 319 int cpu = mycpuid; 320 321 crit_enter(); 322 323 ifac = &ia->ia_ifa.ifa_containers[cpu]; 324 ASSERT_IFAC_VALID(ifac); 325 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0, 326 ("ia is on in_ifaddrhashtbls\n")); 327 328 ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHASH; 329 iac = &ifac->ifa_proto_u.u_in_ifac; 330 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 331 iac, ia_hash); 332 333 crit_exit(); 334 335 ifa_forwardmsg(&msg->lmsg, cpu + 1); 336 } 337 338 static void 339 in_iahashrem_dispatch(netmsg_t msg) 340 { 341 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 342 struct ifaddr_container *ifac; 343 struct in_ifaddr_container *iac; 344 int cpu = mycpuid; 345 346 crit_enter(); 347 348 ifac = &ia->ia_ifa.ifa_containers[cpu]; 349 ASSERT_IFAC_VALID(ifac); 350 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH, 351 ("ia is not on in_ifaddrhashtbls\n")); 352 353 iac = &ifac->ifa_proto_u.u_in_ifac; 354 LIST_REMOVE(iac, ia_hash); 355 ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHASH; 356 357 crit_exit(); 358 359 ifa_forwardmsg(&msg->lmsg, cpu + 1); 360 } 361 362 static void 363 in_ialink(struct in_ifaddr *ia) 364 { 365 struct netmsg_base msg; 366 367 netmsg_init(&msg, NULL, &curthread->td_msgport, 368 0, in_ialink_dispatch); 369 msg.lmsg.u.ms_resultp = ia; 370 371 ifa_domsg(&msg.lmsg, 0); 372 } 373 374 void 375 in_iaunlink(struct in_ifaddr *ia) 376 { 377 struct netmsg_base msg; 378 379 netmsg_init(&msg, NULL, &curthread->td_msgport, 380 0, in_iaunlink_dispatch); 381 msg.lmsg.u.ms_resultp = ia; 382 383 ifa_domsg(&msg.lmsg, 0); 384 } 385 386 void 387 in_iahash_insert(struct in_ifaddr *ia) 388 { 389 struct netmsg_base msg; 390 391 netmsg_init(&msg, NULL, &curthread->td_msgport, 392 0, in_iahashins_dispatch); 393 msg.lmsg.u.ms_resultp = ia; 394 395 ifa_domsg(&msg.lmsg, 0); 396 } 397 398 void 399 in_iahash_remove(struct in_ifaddr *ia) 400 { 401 struct netmsg_base msg; 402 403 netmsg_init(&msg, NULL, &curthread->td_msgport, 404 0, in_iahashrem_dispatch); 405 msg.lmsg.u.ms_resultp = ia; 406 407 ifa_domsg(&msg.lmsg, 0); 408 } 409 410 static __inline struct in_ifaddr * 411 in_ianext(struct in_ifaddr *oia) 412 { 413 struct ifaddr_container *ifac; 414 struct in_ifaddr_container *iac; 415 416 ifac = &oia->ia_ifa.ifa_containers[mycpuid]; 417 ASSERT_IFAC_VALID(ifac); 418 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD, 419 ("ia is not on in_ifaddrheads\n")); 420 421 iac = &ifac->ifa_proto_u.u_in_ifac; 422 iac = TAILQ_NEXT(iac, ia_link); 423 if (iac != NULL) 424 return iac->ia; 425 else 426 return NULL; 427 } 428 429 static int 430 in_control_internal(u_long cmd, caddr_t data, struct ifnet *ifp, 431 struct thread *td) 432 { 433 struct ifreq *ifr = (struct ifreq *)data; 434 struct in_ifaddr *ia = NULL; 435 struct in_addr dst; 436 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 437 struct ifaddr_container *ifac; 438 struct in_ifaddr_container *iac; 439 struct sockaddr_in oldaddr; 440 int hostIsNew, iaIsNew, maskIsNew, ifpWasUp; 441 int error = 0; 442 443 iaIsNew = 0; 444 ifpWasUp = 0; 445 446 /* 447 * Find address for this interface, if it exists. 448 * 449 * If an alias address was specified, find that one instead of 450 * the first one on the interface, if possible 451 */ 452 if (ifp) { 453 struct in_ifaddr *iap; 454 455 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 456 LIST_FOREACH(iac, INADDR_HASH(dst.s_addr), ia_hash) { 457 iap = iac->ia; 458 if (iap->ia_ifp == ifp && 459 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 460 ia = iap; 461 break; 462 } 463 } 464 if (ia == NULL) { 465 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], 466 ifa_link) { 467 iap = ifatoia(ifac->ifa); 468 if (iap->ia_addr.sin_family == AF_INET) { 469 ia = iap; 470 break; 471 } 472 } 473 } 474 475 if (ifp->if_flags & IFF_UP) 476 ifpWasUp = 1; 477 } 478 479 switch (cmd) { 480 case SIOCAIFADDR: 481 case SIOCDIFADDR: 482 if (ifp == NULL) 483 return (EADDRNOTAVAIL); 484 if (ifra->ifra_addr.sin_family == AF_INET) { 485 while (ia != NULL) { 486 if (ia->ia_ifp == ifp && 487 ia->ia_addr.sin_addr.s_addr == 488 ifra->ifra_addr.sin_addr.s_addr) 489 break; 490 ia = in_ianext(ia); 491 } 492 if ((ifp->if_flags & IFF_POINTOPOINT) && 493 cmd == SIOCAIFADDR && 494 ifra->ifra_dstaddr.sin_addr.s_addr == INADDR_ANY) { 495 return EDESTADDRREQ; 496 } 497 } 498 if (cmd == SIOCDIFADDR && ia == NULL) 499 return (EADDRNOTAVAIL); 500 /* FALLTHROUGH */ 501 case SIOCSIFADDR: 502 case SIOCSIFNETMASK: 503 case SIOCSIFDSTADDR: 504 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 505 return error; 506 507 if (ifp == NULL) 508 return (EADDRNOTAVAIL); 509 510 if (cmd == SIOCSIFDSTADDR && 511 (ifp->if_flags & IFF_POINTOPOINT) == 0) 512 return (EINVAL); 513 514 if (ia == NULL) { 515 struct ifaddr *ifa; 516 int i; 517 518 ia = ifa_create(sizeof(*ia), M_WAITOK); 519 ifa = &ia->ia_ifa; 520 521 /* 522 * Setup per-CPU information 523 */ 524 for (i = 0; i < ncpus; ++i) { 525 ifac = &ifa->ifa_containers[i]; 526 iac = &ifac->ifa_proto_u.u_in_ifac; 527 iac->ia = ia; 528 iac->ia_ifac = ifac; 529 } 530 531 /* 532 * Protect from NETISR_IP traversing address list 533 * while we're modifying it. 534 */ 535 crit_enter(); 536 537 in_ialink(ia); 538 ifa_iflink(ifa, ifp, 1); 539 540 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 541 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 542 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 543 ia->ia_sockmask.sin_len = 8; 544 ia->ia_sockmask.sin_family = AF_INET; 545 if (ifp->if_flags & IFF_BROADCAST) { 546 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr; 547 ia->ia_broadaddr.sin_family = AF_INET; 548 } 549 ia->ia_ifp = ifp; 550 if (!(ifp->if_flags & IFF_LOOPBACK)) 551 in_interfaces++; 552 iaIsNew = 1; 553 554 crit_exit(); 555 } 556 break; 557 558 case SIOCSIFBRDADDR: 559 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 560 return error; 561 /* FALLTHROUGH */ 562 563 case SIOCGIFADDR: 564 case SIOCGIFNETMASK: 565 case SIOCGIFDSTADDR: 566 case SIOCGIFBRDADDR: 567 if (ia == NULL) 568 return (EADDRNOTAVAIL); 569 break; 570 } 571 572 switch (cmd) { 573 case SIOCGIFADDR: 574 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 575 return (0); 576 577 case SIOCGIFBRDADDR: 578 if ((ifp->if_flags & IFF_BROADCAST) == 0) 579 return (EINVAL); 580 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 581 return (0); 582 583 case SIOCGIFDSTADDR: 584 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 585 return (EINVAL); 586 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 587 return (0); 588 589 case SIOCGIFNETMASK: 590 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 591 return (0); 592 593 case SIOCSIFDSTADDR: 594 KKASSERT(ifp->if_flags & IFF_POINTOPOINT); 595 596 oldaddr = ia->ia_dstaddr; 597 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 598 if (ifp->if_ioctl != NULL) { 599 ifnet_serialize_all(ifp); 600 error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia, 601 td->td_proc->p_ucred); 602 ifnet_deserialize_all(ifp); 603 if (error) { 604 ia->ia_dstaddr = oldaddr; 605 return (error); 606 } 607 } 608 if (ia->ia_flags & IFA_ROUTE) { 609 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 610 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 611 ia->ia_ifa.ifa_dstaddr = 612 (struct sockaddr *)&ia->ia_dstaddr; 613 rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP); 614 } 615 return (0); 616 617 case SIOCSIFBRDADDR: 618 if ((ifp->if_flags & IFF_BROADCAST) == 0) 619 return (EINVAL); 620 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 621 return (0); 622 623 case SIOCSIFADDR: 624 error = in_ifinit(ifp, ia, 625 (const struct sockaddr_in *)&ifr->ifr_addr, 1); 626 if (error != 0 && iaIsNew) 627 break; 628 if (error == 0) { 629 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 630 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 631 &ia->ia_ifa); 632 } 633 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) { 634 /* 635 * Interface is brought up by in_ifinit() 636 * (via ifp->if_ioctl). We act as if the 637 * interface got IFF_UP flag turned on. 638 */ 639 if_up(ifp); 640 } 641 return (0); 642 643 case SIOCSIFNETMASK: 644 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 645 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 646 return (0); 647 648 case SIOCAIFADDR: 649 maskIsNew = 0; 650 hostIsNew = 1; 651 error = 0; 652 if (ia->ia_addr.sin_family == AF_INET) { 653 if (ifra->ifra_addr.sin_len == 0) { 654 ifra->ifra_addr = ia->ia_addr; 655 hostIsNew = 0; 656 } else if (ifra->ifra_addr.sin_addr.s_addr == 657 ia->ia_addr.sin_addr.s_addr) { 658 hostIsNew = 0; 659 } 660 } 661 if (ifra->ifra_mask.sin_len) { 662 in_ifscrub(ifp, ia); 663 ia->ia_sockmask = ifra->ifra_mask; 664 ia->ia_sockmask.sin_family = AF_INET; 665 ia->ia_subnetmask = 666 ntohl(ia->ia_sockmask.sin_addr.s_addr); 667 maskIsNew = 1; 668 } 669 if ((ifp->if_flags & IFF_POINTOPOINT) && 670 ifra->ifra_dstaddr.sin_family == AF_INET) { 671 in_ifscrub(ifp, ia); 672 ia->ia_dstaddr = ifra->ifra_dstaddr; 673 maskIsNew = 1; /* We lie; but the effect's the same */ 674 } 675 if (ifra->ifra_addr.sin_family == AF_INET && 676 (hostIsNew || maskIsNew)) 677 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 678 679 if (error != 0 && iaIsNew) 680 break; 681 682 if ((ifp->if_flags & IFF_BROADCAST) && 683 ifra->ifra_broadaddr.sin_family == AF_INET) 684 ia->ia_broadaddr = ifra->ifra_broadaddr; 685 if (error == 0) { 686 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 687 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 688 &ia->ia_ifa); 689 } 690 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) { 691 /* See the comment in SIOCSIFADDR */ 692 if_up(ifp); 693 } 694 return (error); 695 696 case SIOCDIFADDR: 697 /* 698 * in_ifscrub kills the interface route. 699 */ 700 in_ifscrub(ifp, ia); 701 /* 702 * in_ifadown gets rid of all the rest of 703 * the routes. This is not quite the right 704 * thing to do, but at least if we are running 705 * a routing process they will come back. 706 */ 707 in_ifadown(&ia->ia_ifa, 1); 708 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE, 709 &ia->ia_ifa); 710 error = 0; 711 break; 712 713 default: 714 if (ifp == NULL || ifp->if_ioctl == NULL) 715 return (EOPNOTSUPP); 716 ifnet_serialize_all(ifp); 717 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred); 718 ifnet_deserialize_all(ifp); 719 return (error); 720 } 721 722 KKASSERT(cmd == SIOCDIFADDR || 723 ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && iaIsNew)); 724 725 ifa_ifunlink(&ia->ia_ifa, ifp); 726 in_iaunlink(ia); 727 728 if (cmd == SIOCDIFADDR) { 729 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 730 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) 731 in_iahash_remove(ia); 732 } 733 #ifdef INVARIANTS 734 else { 735 /* 736 * If cmd is SIOCSIFADDR or SIOCAIFADDR, in_ifinit() has 737 * already taken care of the deletion from hash table 738 */ 739 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 740 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0, 741 ("SIOC%cIFADDR failed on new ia, " 742 "but the new ia is still in hash table\n", 743 cmd == SIOCSIFADDR ? 'S' : 'A')); 744 } 745 #endif 746 747 ifa_destroy(&ia->ia_ifa); 748 749 if ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && 750 !ifpWasUp && (ifp->if_flags & IFF_UP)) { 751 /* 752 * Though the address assignment failed, the 753 * interface is brought up by in_ifinit() 754 * (via ifp->if_ioctl). With the hope that 755 * the interface has some valid addresses, we 756 * act as if IFF_UP flag was just set on the 757 * interface. 758 * 759 * NOTE: 760 * This could only be done after the failed 761 * address is unlinked from the global address 762 * list. 763 */ 764 if_up(ifp); 765 } 766 767 return (error); 768 } 769 770 /* 771 * SIOC[GAD]LIFADDR. 772 * SIOCGLIFADDR: get first address. (?!?) 773 * SIOCGLIFADDR with IFLR_PREFIX: 774 * get first address that matches the specified prefix. 775 * SIOCALIFADDR: add the specified address. 776 * SIOCALIFADDR with IFLR_PREFIX: 777 * EINVAL since we can't deduce hostid part of the address. 778 * SIOCDLIFADDR: delete the specified address. 779 * SIOCDLIFADDR with IFLR_PREFIX: 780 * delete the first address that matches the specified prefix. 781 * return values: 782 * EINVAL on invalid parameters 783 * EADDRNOTAVAIL on prefix match failed/specified address not found 784 * other values may be returned from in_ioctl() 785 * 786 * NOTE! td might be NULL. 787 */ 788 static int 789 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 790 struct thread *td) 791 { 792 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 793 794 /* sanity checks */ 795 if (!data || !ifp) { 796 panic("invalid argument to in_lifaddr_ioctl"); 797 /*NOTRECHED*/ 798 } 799 800 switch (cmd) { 801 case SIOCGLIFADDR: 802 /* address must be specified on GET with IFLR_PREFIX */ 803 if ((iflr->flags & IFLR_PREFIX) == 0) 804 break; 805 /*FALLTHROUGH*/ 806 case SIOCALIFADDR: 807 case SIOCDLIFADDR: 808 /* address must be specified on ADD and DELETE */ 809 if (iflr->addr.ss_family != AF_INET) 810 return EINVAL; 811 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 812 return EINVAL; 813 /* XXX need improvement */ 814 if (iflr->dstaddr.ss_family 815 && iflr->dstaddr.ss_family != AF_INET) 816 return EINVAL; 817 if (iflr->dstaddr.ss_family 818 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 819 return EINVAL; 820 break; 821 default: /*shouldn't happen*/ 822 return EOPNOTSUPP; 823 } 824 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 825 return EINVAL; 826 827 switch (cmd) { 828 case SIOCALIFADDR: 829 { 830 struct in_aliasreq ifra; 831 832 if (iflr->flags & IFLR_PREFIX) 833 return EINVAL; 834 835 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 836 bzero(&ifra, sizeof ifra); 837 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name); 838 839 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 840 841 if (iflr->dstaddr.ss_family) { /*XXX*/ 842 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 843 iflr->dstaddr.ss_len); 844 } 845 846 ifra.ifra_mask.sin_family = AF_INET; 847 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 848 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 849 850 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 851 } 852 case SIOCGLIFADDR: 853 case SIOCDLIFADDR: 854 { 855 struct ifaddr_container *ifac; 856 struct in_ifaddr *ia; 857 struct in_addr mask, candidate, match; 858 struct sockaddr_in *sin; 859 int cmp; 860 861 bzero(&mask, sizeof mask); 862 if (iflr->flags & IFLR_PREFIX) { 863 /* lookup a prefix rather than address. */ 864 in_len2mask(&mask, iflr->prefixlen); 865 866 sin = (struct sockaddr_in *)&iflr->addr; 867 match.s_addr = sin->sin_addr.s_addr; 868 match.s_addr &= mask.s_addr; 869 870 /* if you set extra bits, that's wrong */ 871 if (match.s_addr != sin->sin_addr.s_addr) 872 return EINVAL; 873 874 cmp = 1; 875 } else { 876 if (cmd == SIOCGLIFADDR) { 877 /* on getting an address, take the 1st match */ 878 match.s_addr = 0; /* gcc4 warning */ 879 cmp = 0; /*XXX*/ 880 } else { 881 /* on deleting an address, do exact match */ 882 in_len2mask(&mask, 32); 883 sin = (struct sockaddr_in *)&iflr->addr; 884 match.s_addr = sin->sin_addr.s_addr; 885 886 cmp = 1; 887 } 888 } 889 890 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 891 struct ifaddr *ifa = ifac->ifa; 892 893 if (ifa->ifa_addr->sa_family != AF_INET6) 894 continue; 895 if (!cmp) 896 break; 897 candidate.s_addr = 898 ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 899 candidate.s_addr &= mask.s_addr; 900 if (candidate.s_addr == match.s_addr) 901 break; 902 } 903 if (ifac == NULL) 904 return EADDRNOTAVAIL; 905 ia = (struct in_ifaddr *)(ifac->ifa); 906 907 if (cmd == SIOCGLIFADDR) { 908 /* fill in the if_laddrreq structure */ 909 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 910 911 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 912 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 913 ia->ia_dstaddr.sin_len); 914 } else 915 bzero(&iflr->dstaddr, sizeof iflr->dstaddr); 916 917 iflr->prefixlen = 918 in_mask2len(&ia->ia_sockmask.sin_addr); 919 920 iflr->flags = 0; /*XXX*/ 921 922 return 0; 923 } else { 924 struct in_aliasreq ifra; 925 926 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 927 bzero(&ifra, sizeof ifra); 928 bcopy(iflr->iflr_name, ifra.ifra_name, 929 sizeof ifra.ifra_name); 930 931 bcopy(&ia->ia_addr, &ifra.ifra_addr, 932 ia->ia_addr.sin_len); 933 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 934 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 935 ia->ia_dstaddr.sin_len); 936 } 937 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 938 ia->ia_sockmask.sin_len); 939 940 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 941 ifp, td); 942 } 943 } 944 } 945 946 return EOPNOTSUPP; /*just for safety*/ 947 } 948 949 /* 950 * Delete any existing route for an interface. 951 */ 952 void 953 in_ifscrub(struct ifnet *ifp __unused, struct in_ifaddr *ia) 954 { 955 in_scrubprefix(ia); 956 } 957 958 /* 959 * Initialize an interface's internet address 960 * and routing table entry. 961 */ 962 static int 963 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, 964 const struct sockaddr_in *sin, int scrub) 965 { 966 u_long i = ntohl(sin->sin_addr.s_addr); 967 struct sockaddr_in oldaddr; 968 struct ifaddr_container *ifac; 969 int flags = RTF_UP, error = 0; 970 int was_hash = 0; 971 972 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 973 oldaddr = ia->ia_addr; 974 975 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) { 976 was_hash = 1; 977 in_iahash_remove(ia); 978 } 979 980 ia->ia_addr = *sin; 981 if (ia->ia_addr.sin_family == AF_INET) 982 in_iahash_insert(ia); 983 984 /* 985 * Give the interface a chance to initialize 986 * if this is its first address, 987 * and to validate the address if necessary. 988 */ 989 if (ifp->if_ioctl != NULL) { 990 ifnet_serialize_all(ifp); 991 error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL); 992 ifnet_deserialize_all(ifp); 993 if (error) 994 goto fail; 995 } 996 997 /* 998 * Delete old route, if requested. 999 */ 1000 if (scrub) { 1001 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 1002 in_ifscrub(ifp, ia); 1003 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1004 } 1005 1006 /* 1007 * Calculate netmask/subnetmask. 1008 */ 1009 if (IN_CLASSA(i)) 1010 ia->ia_netmask = IN_CLASSA_NET; 1011 else if (IN_CLASSB(i)) 1012 ia->ia_netmask = IN_CLASSB_NET; 1013 else 1014 ia->ia_netmask = IN_CLASSC_NET; 1015 /* 1016 * The subnet mask usually includes at least the standard network part, 1017 * but may may be smaller in the case of supernetting. 1018 * If it is set, we believe it. 1019 */ 1020 if (ia->ia_subnetmask == 0) { 1021 ia->ia_subnetmask = ia->ia_netmask; 1022 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 1023 } else { 1024 ia->ia_netmask &= ia->ia_subnetmask; 1025 } 1026 ia->ia_net = i & ia->ia_netmask; 1027 ia->ia_subnet = i & ia->ia_subnetmask; 1028 in_socktrim(&ia->ia_sockmask); 1029 1030 /* 1031 * Add route for the network. 1032 */ 1033 ia->ia_ifa.ifa_metric = ifp->if_metric; 1034 if (ifp->if_flags & IFF_BROADCAST) { 1035 ia->ia_broadaddr.sin_addr.s_addr = 1036 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 1037 ia->ia_netbroadcast.s_addr = 1038 htonl(ia->ia_net | ~ ia->ia_netmask); 1039 } else if (ifp->if_flags & IFF_LOOPBACK) { 1040 ia->ia_dstaddr = ia->ia_addr; 1041 flags |= RTF_HOST; 1042 } else if (ifp->if_flags & IFF_POINTOPOINT) { 1043 if (ia->ia_dstaddr.sin_family != AF_INET) 1044 return (0); 1045 flags |= RTF_HOST; 1046 } 1047 1048 /*- 1049 * Don't add host routes for interface addresses of 1050 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it 1051 * possible to assign several such address pairs with consistent 1052 * results (no host route) and is required by BOOTP. 1053 * 1054 * XXX: This is ugly ! There should be a way for the caller to 1055 * say that they don't want a host route. 1056 */ 1057 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY || 1058 ia->ia_netmask != IN_CLASSA_NET || 1059 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) { 1060 error = in_addprefix(ia, flags); 1061 if (error) 1062 goto fail; 1063 } 1064 1065 /* 1066 * If the interface supports multicast, join the "all hosts" 1067 * multicast group on that interface. 1068 */ 1069 if (ifp->if_flags & IFF_MULTICAST) { 1070 struct in_addr addr; 1071 1072 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 1073 in_addmulti(&addr, ifp); 1074 } 1075 return (0); 1076 fail: 1077 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) 1078 in_iahash_remove(ia); 1079 1080 ia->ia_addr = oldaddr; 1081 if (was_hash) 1082 in_iahash_insert(ia); 1083 return (error); 1084 } 1085 1086 #define rtinitflags(x) \ 1087 (((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) \ 1088 ? RTF_HOST : 0) 1089 1090 /* 1091 * Add a route to prefix ("connected route" in cisco terminology). 1092 * Do nothing, if there are some interface addresses with the same 1093 * prefix already. This function assumes that the 'target' parent 1094 * interface is UP. 1095 */ 1096 static int 1097 in_addprefix(struct in_ifaddr *target, int flags) 1098 { 1099 struct in_ifaddr_container *iac; 1100 struct in_addr prefix, mask; 1101 int error; 1102 1103 mask = target->ia_sockmask.sin_addr; 1104 if (flags & RTF_HOST) { 1105 prefix = target->ia_dstaddr.sin_addr; 1106 } else { 1107 prefix = target->ia_addr.sin_addr; 1108 prefix.s_addr &= mask.s_addr; 1109 } 1110 1111 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 1112 struct in_ifaddr *ia = iac->ia; 1113 struct in_addr p; 1114 1115 /* Don't test against self */ 1116 if (ia == target) 1117 continue; 1118 1119 /* The tested address does not own a route entry */ 1120 if ((ia->ia_flags & IFA_ROUTE) == 0) 1121 continue; 1122 1123 /* Prefix test */ 1124 if (rtinitflags(ia)) { 1125 p = ia->ia_dstaddr.sin_addr; 1126 } else { 1127 p = ia->ia_addr.sin_addr; 1128 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1129 } 1130 if (prefix.s_addr != p.s_addr) 1131 continue; 1132 1133 /* 1134 * If the to-be-added address and the curretly being 1135 * tested address are not host addresses, we need to 1136 * take subnetmask into consideration. 1137 */ 1138 if (!(flags & RTF_HOST) && !rtinitflags(ia) && 1139 mask.s_addr != ia->ia_sockmask.sin_addr.s_addr) 1140 continue; 1141 1142 /* 1143 * If we got a matching prefix route inserted by other 1144 * interface address, we don't need to bother. 1145 */ 1146 return 0; 1147 } 1148 1149 /* 1150 * No one seem to have prefix route; insert it. 1151 */ 1152 error = rtinit(&target->ia_ifa, RTM_ADD, flags); 1153 if (!error) 1154 target->ia_flags |= IFA_ROUTE; 1155 return error; 1156 } 1157 1158 /* 1159 * Remove a route to prefix ("connected route" in cisco terminology). 1160 * Re-installs the route by using another interface address, if there's 1161 * one with the same prefix (otherwise we lose the route mistakenly). 1162 */ 1163 static void 1164 in_scrubprefix(struct in_ifaddr *target) 1165 { 1166 struct in_ifaddr_container *iac; 1167 struct in_addr prefix, mask; 1168 int error; 1169 1170 if ((target->ia_flags & IFA_ROUTE) == 0) 1171 return; 1172 1173 mask = target->ia_sockmask.sin_addr; 1174 if (rtinitflags(target)) { 1175 prefix = target->ia_dstaddr.sin_addr; 1176 } else { 1177 prefix = target->ia_addr.sin_addr; 1178 prefix.s_addr &= mask.s_addr; 1179 } 1180 1181 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 1182 struct in_ifaddr *ia = iac->ia; 1183 struct in_addr p; 1184 1185 /* Don't test against self */ 1186 if (ia == target) 1187 continue; 1188 1189 /* The tested address already owns a route entry */ 1190 if (ia->ia_flags & IFA_ROUTE) 1191 continue; 1192 1193 /* 1194 * The prefix route of the tested address should 1195 * never be installed if its parent interface is 1196 * not UP yet. 1197 */ 1198 if ((ia->ia_ifp->if_flags & IFF_UP) == 0) 1199 continue; 1200 1201 /* Prefix test */ 1202 if (rtinitflags(ia)) { 1203 p = ia->ia_dstaddr.sin_addr; 1204 } else { 1205 p = ia->ia_addr.sin_addr; 1206 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1207 } 1208 if (prefix.s_addr != p.s_addr) 1209 continue; 1210 1211 /* 1212 * We don't need to test subnetmask here, as what we do 1213 * in in_addprefix(), since if the the tested address's 1214 * parent interface is UP, the tested address should own 1215 * a prefix route entry and we would never reach here. 1216 */ 1217 1218 /* 1219 * If we got a matching prefix route, move IFA_ROUTE to him 1220 */ 1221 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target)); 1222 target->ia_flags &= ~IFA_ROUTE; 1223 1224 error = rtinit(&ia->ia_ifa, RTM_ADD, rtinitflags(ia) | RTF_UP); 1225 if (!error) 1226 ia->ia_flags |= IFA_ROUTE; 1227 return; 1228 } 1229 1230 /* 1231 * No candidates for this prefix route; just remove it. 1232 */ 1233 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target)); 1234 target->ia_flags &= ~IFA_ROUTE; 1235 } 1236 1237 #undef rtinitflags 1238 1239 /* 1240 * Return 1 if the address might be a local broadcast address. 1241 */ 1242 int 1243 in_broadcast(struct in_addr in, struct ifnet *ifp) 1244 { 1245 struct ifaddr_container *ifac; 1246 u_long t; 1247 1248 if (in.s_addr == INADDR_BROADCAST || 1249 in.s_addr == INADDR_ANY) 1250 return 1; 1251 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1252 return 0; 1253 t = ntohl(in.s_addr); 1254 /* 1255 * Look through the list of addresses for a match 1256 * with a broadcast address. 1257 */ 1258 #define ia ((struct in_ifaddr *)ifa) 1259 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1260 struct ifaddr *ifa = ifac->ifa; 1261 1262 if (ifa->ifa_addr->sa_family == AF_INET && 1263 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1264 in.s_addr == ia->ia_netbroadcast.s_addr || 1265 /* 1266 * Check for old-style (host 0) broadcast. 1267 */ 1268 t == ia->ia_subnet || t == ia->ia_net) && 1269 /* 1270 * Check for an all one subnetmask. These 1271 * only exist when an interface gets a secondary 1272 * address. 1273 */ 1274 ia->ia_subnetmask != (u_long)0xffffffff) 1275 return 1; 1276 } 1277 return (0); 1278 #undef ia 1279 } 1280 /* 1281 * Add an address to the list of IP multicast addresses for a given interface. 1282 */ 1283 struct in_multi * 1284 in_addmulti(struct in_addr *ap, struct ifnet *ifp) 1285 { 1286 struct in_multi *inm; 1287 int error; 1288 struct sockaddr_in sin; 1289 struct ifmultiaddr *ifma; 1290 1291 /* 1292 * Call generic routine to add membership or increment 1293 * refcount. It wants addresses in the form of a sockaddr, 1294 * so we build one here (being careful to zero the unused bytes). 1295 */ 1296 bzero(&sin, sizeof sin); 1297 sin.sin_family = AF_INET; 1298 sin.sin_len = sizeof sin; 1299 sin.sin_addr = *ap; 1300 crit_enter(); 1301 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 1302 if (error) { 1303 crit_exit(); 1304 return 0; 1305 } 1306 1307 /* 1308 * If ifma->ifma_protospec is null, then if_addmulti() created 1309 * a new record. Otherwise, we are done. 1310 */ 1311 if (ifma->ifma_protospec != 0) { 1312 crit_exit(); 1313 return ifma->ifma_protospec; 1314 } 1315 1316 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 1317 at interrupt time? If so, need to fix if_addmulti. XXX */ 1318 inm = kmalloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO); 1319 inm->inm_addr = *ap; 1320 inm->inm_ifp = ifp; 1321 inm->inm_ifma = ifma; 1322 ifma->ifma_protospec = inm; 1323 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 1324 1325 /* 1326 * Let IGMP know that we have joined a new IP multicast group. 1327 */ 1328 igmp_joingroup(inm); 1329 crit_exit(); 1330 return (inm); 1331 } 1332 1333 /* 1334 * Delete a multicast address record. 1335 */ 1336 void 1337 in_delmulti(struct in_multi *inm) 1338 { 1339 struct ifmultiaddr *ifma; 1340 struct in_multi my_inm; 1341 1342 crit_enter(); 1343 ifma = inm->inm_ifma; 1344 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 1345 if (ifma->ifma_refcount == 1) { 1346 /* 1347 * No remaining claims to this record; let IGMP know that 1348 * we are leaving the multicast group. 1349 * But do it after the if_delmulti() which might reset 1350 * the interface and nuke the packet. 1351 */ 1352 my_inm = *inm ; 1353 ifma->ifma_protospec = 0; 1354 LIST_REMOVE(inm, inm_link); 1355 kfree(inm, M_IPMADDR); 1356 } 1357 /* XXX - should be separate API for when we have an ifma? */ 1358 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1359 if (my_inm.inm_ifp != NULL) 1360 igmp_leavegroup(&my_inm); 1361 crit_exit(); 1362 } 1363 1364 void 1365 in_ifdetach(struct ifnet *ifp) 1366 { 1367 in_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp); 1368 in_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp); 1369 } 1370