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 void in_control_dispatch(struct netmsg *); 76 static int in_control_internal(u_long, caddr_t, struct ifnet *, 77 struct thread *); 78 79 static int in_addprefix(struct in_ifaddr *, int); 80 static void in_scrubprefix(struct in_ifaddr *); 81 82 static int subnetsarelocal = 0; 83 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 84 &subnetsarelocal, 0, ""); 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 struct in_control_arg { 198 u_long cmd; 199 caddr_t data; 200 struct ifnet *ifp; 201 struct thread *td; 202 }; 203 204 static void 205 in_control_dispatch(struct netmsg *nmsg) 206 { 207 struct lwkt_msg *msg = &nmsg->nm_lmsg; 208 const struct in_control_arg *arg = msg->u.ms_resultp; 209 int error; 210 211 error = in_control_internal(arg->cmd, arg->data, arg->ifp, arg->td); 212 lwkt_replymsg(msg, error); 213 } 214 215 /* 216 * Generic internet control operations (ioctl's). 217 * Ifp is 0 if not an interface-specific ioctl. 218 * 219 * NOTE! td might be NULL. 220 */ 221 /* ARGSUSED */ 222 int 223 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 224 struct thread *td) 225 { 226 struct netmsg nmsg; 227 struct in_control_arg arg; 228 struct lwkt_msg *msg; 229 int error; 230 231 switch (cmd) { 232 case SIOCALIFADDR: 233 case SIOCDLIFADDR: 234 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 235 return error; 236 /* FALLTHROUGH */ 237 case SIOCGLIFADDR: 238 if (!ifp) 239 return EINVAL; 240 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 241 } 242 243 KASSERT(cmd != SIOCALIFADDR && cmd != SIOCDLIFADDR, 244 ("recursive SIOC%cLIFADDR!\n", 245 cmd == SIOCDLIFADDR ? 'D' : 'A')); 246 247 /* 248 * IFADDR alterations are serialized by netisr0 249 */ 250 switch (cmd) { 251 case SIOCSIFDSTADDR: 252 case SIOCSIFBRDADDR: 253 case SIOCSIFADDR: 254 case SIOCSIFNETMASK: 255 case SIOCAIFADDR: 256 case SIOCDIFADDR: 257 bzero(&arg, sizeof(arg)); 258 arg.cmd = cmd; 259 arg.data = data; 260 arg.ifp = ifp; 261 arg.td = td; 262 263 netmsg_init(&nmsg, &curthread->td_msgport, 0, 264 in_control_dispatch); 265 msg = &nmsg.nm_lmsg; 266 msg->u.ms_resultp = &arg; 267 268 lwkt_domsg(cpu_portfn(0), msg, 0); 269 return msg->ms_error; 270 default: 271 return in_control_internal(cmd, data, ifp, td); 272 } 273 } 274 275 static void 276 in_ialink_dispatch(struct netmsg *nmsg) 277 { 278 struct lwkt_msg *lmsg = &nmsg->nm_lmsg; 279 struct in_ifaddr *ia = lmsg->u.ms_resultp; 280 struct ifaddr_container *ifac; 281 struct in_ifaddr_container *iac; 282 int cpu = mycpuid; 283 284 crit_enter(); 285 286 ifac = &ia->ia_ifa.ifa_containers[cpu]; 287 ASSERT_IFAC_VALID(ifac); 288 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD) == 0, 289 ("ia is on in_ifaddrheads\n")); 290 291 ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHEAD; 292 iac = &ifac->ifa_proto_u.u_in_ifac; 293 TAILQ_INSERT_TAIL(&in_ifaddrheads[cpu], iac, ia_link); 294 295 crit_exit(); 296 297 ifa_forwardmsg(lmsg, cpu + 1); 298 } 299 300 static void 301 in_iaunlink_dispatch(struct netmsg *nmsg) 302 { 303 struct lwkt_msg *lmsg = &nmsg->nm_lmsg; 304 struct in_ifaddr *ia = lmsg->u.ms_resultp; 305 struct ifaddr_container *ifac; 306 struct in_ifaddr_container *iac; 307 int cpu = mycpuid; 308 309 crit_enter(); 310 311 ifac = &ia->ia_ifa.ifa_containers[cpu]; 312 ASSERT_IFAC_VALID(ifac); 313 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD, 314 ("ia is not on in_ifaddrheads\n")); 315 316 iac = &ifac->ifa_proto_u.u_in_ifac; 317 TAILQ_REMOVE(&in_ifaddrheads[cpu], iac, ia_link); 318 ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHEAD; 319 320 crit_exit(); 321 322 ifa_forwardmsg(lmsg, cpu + 1); 323 } 324 325 static void 326 in_iahashins_dispatch(struct netmsg *nmsg) 327 { 328 struct lwkt_msg *lmsg = &nmsg->nm_lmsg; 329 struct in_ifaddr *ia = lmsg->u.ms_resultp; 330 struct ifaddr_container *ifac; 331 struct in_ifaddr_container *iac; 332 int cpu = mycpuid; 333 334 crit_enter(); 335 336 ifac = &ia->ia_ifa.ifa_containers[cpu]; 337 ASSERT_IFAC_VALID(ifac); 338 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0, 339 ("ia is on in_ifaddrhashtbls\n")); 340 341 ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHASH; 342 iac = &ifac->ifa_proto_u.u_in_ifac; 343 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 344 iac, ia_hash); 345 346 crit_exit(); 347 348 ifa_forwardmsg(lmsg, cpu + 1); 349 } 350 351 static void 352 in_iahashrem_dispatch(struct netmsg *nmsg) 353 { 354 struct lwkt_msg *lmsg = &nmsg->nm_lmsg; 355 struct in_ifaddr *ia = lmsg->u.ms_resultp; 356 struct ifaddr_container *ifac; 357 struct in_ifaddr_container *iac; 358 int cpu = mycpuid; 359 360 crit_enter(); 361 362 ifac = &ia->ia_ifa.ifa_containers[cpu]; 363 ASSERT_IFAC_VALID(ifac); 364 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH, 365 ("ia is not on in_ifaddrhashtbls\n")); 366 367 iac = &ifac->ifa_proto_u.u_in_ifac; 368 LIST_REMOVE(iac, ia_hash); 369 ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHASH; 370 371 crit_exit(); 372 373 ifa_forwardmsg(lmsg, cpu + 1); 374 } 375 376 static void 377 in_ialink(struct in_ifaddr *ia) 378 { 379 struct netmsg nmsg; 380 struct lwkt_msg *lmsg; 381 382 netmsg_init(&nmsg, &curthread->td_msgport, 0, in_ialink_dispatch); 383 lmsg = &nmsg.nm_lmsg; 384 lmsg->u.ms_resultp = ia; 385 386 ifa_domsg(lmsg, 0); 387 } 388 389 void 390 in_iaunlink(struct in_ifaddr *ia) 391 { 392 struct netmsg nmsg; 393 struct lwkt_msg *lmsg; 394 395 netmsg_init(&nmsg, &curthread->td_msgport, 0, in_iaunlink_dispatch); 396 lmsg = &nmsg.nm_lmsg; 397 lmsg->u.ms_resultp = ia; 398 399 ifa_domsg(lmsg, 0); 400 } 401 402 void 403 in_iahash_insert(struct in_ifaddr *ia) 404 { 405 struct netmsg nmsg; 406 struct lwkt_msg *lmsg; 407 408 netmsg_init(&nmsg, &curthread->td_msgport, 0, in_iahashins_dispatch); 409 lmsg = &nmsg.nm_lmsg; 410 lmsg->u.ms_resultp = ia; 411 412 ifa_domsg(lmsg, 0); 413 } 414 415 void 416 in_iahash_remove(struct in_ifaddr *ia) 417 { 418 struct netmsg nmsg; 419 struct lwkt_msg *lmsg; 420 421 netmsg_init(&nmsg, &curthread->td_msgport, 0, in_iahashrem_dispatch); 422 lmsg = &nmsg.nm_lmsg; 423 lmsg->u.ms_resultp = ia; 424 425 ifa_domsg(lmsg, 0); 426 } 427 428 static __inline struct in_ifaddr * 429 in_ianext(struct in_ifaddr *oia) 430 { 431 struct ifaddr_container *ifac; 432 struct in_ifaddr_container *iac; 433 434 ifac = &oia->ia_ifa.ifa_containers[mycpuid]; 435 ASSERT_IFAC_VALID(ifac); 436 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD, 437 ("ia is not on in_ifaddrheads\n")); 438 439 iac = &ifac->ifa_proto_u.u_in_ifac; 440 iac = TAILQ_NEXT(iac, ia_link); 441 if (iac != NULL) 442 return iac->ia; 443 else 444 return NULL; 445 } 446 447 static int 448 in_control_internal(u_long cmd, caddr_t data, struct ifnet *ifp, 449 struct thread *td) 450 { 451 struct ifreq *ifr = (struct ifreq *)data; 452 struct in_ifaddr *ia = NULL; 453 struct in_addr dst; 454 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 455 struct ifaddr_container *ifac; 456 struct in_ifaddr_container *iac; 457 struct sockaddr_in oldaddr; 458 int hostIsNew, iaIsNew, maskIsNew, ifpWasUp; 459 int error = 0; 460 461 iaIsNew = 0; 462 ifpWasUp = 0; 463 464 /* 465 * Find address for this interface, if it exists. 466 * 467 * If an alias address was specified, find that one instead of 468 * the first one on the interface, if possible 469 */ 470 if (ifp) { 471 struct in_ifaddr *iap; 472 473 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 474 LIST_FOREACH(iac, INADDR_HASH(dst.s_addr), ia_hash) { 475 iap = iac->ia; 476 if (iap->ia_ifp == ifp && 477 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 478 ia = iap; 479 break; 480 } 481 } 482 if (ia == NULL) { 483 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], 484 ifa_link) { 485 iap = ifatoia(ifac->ifa); 486 if (iap->ia_addr.sin_family == AF_INET) { 487 ia = iap; 488 break; 489 } 490 } 491 } 492 493 if (ifp->if_flags & IFF_UP) 494 ifpWasUp = 1; 495 } 496 497 switch (cmd) { 498 case SIOCAIFADDR: 499 case SIOCDIFADDR: 500 if (ifp == NULL) 501 return (EADDRNOTAVAIL); 502 if (ifra->ifra_addr.sin_family == AF_INET) { 503 while (ia != NULL) { 504 if (ia->ia_ifp == ifp && 505 ia->ia_addr.sin_addr.s_addr == 506 ifra->ifra_addr.sin_addr.s_addr) 507 break; 508 ia = in_ianext(ia); 509 } 510 if ((ifp->if_flags & IFF_POINTOPOINT) && 511 cmd == SIOCAIFADDR && 512 ifra->ifra_dstaddr.sin_addr.s_addr == INADDR_ANY) { 513 return EDESTADDRREQ; 514 } 515 } 516 if (cmd == SIOCDIFADDR && ia == NULL) 517 return (EADDRNOTAVAIL); 518 /* FALLTHROUGH */ 519 case SIOCSIFADDR: 520 case SIOCSIFNETMASK: 521 case SIOCSIFDSTADDR: 522 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 523 return error; 524 525 if (ifp == NULL) 526 return (EADDRNOTAVAIL); 527 528 if (cmd == SIOCSIFDSTADDR && 529 (ifp->if_flags & IFF_POINTOPOINT) == 0) 530 return (EINVAL); 531 532 if (ia == NULL) { 533 struct ifaddr *ifa; 534 int i; 535 536 ia = ifa_create(sizeof(*ia), M_WAITOK); 537 ifa = &ia->ia_ifa; 538 539 /* 540 * Setup per-CPU information 541 */ 542 for (i = 0; i < ncpus; ++i) { 543 ifac = &ifa->ifa_containers[i]; 544 iac = &ifac->ifa_proto_u.u_in_ifac; 545 iac->ia = ia; 546 iac->ia_ifac = ifac; 547 } 548 549 /* 550 * Protect from NETISR_IP traversing address list 551 * while we're modifying it. 552 */ 553 crit_enter(); 554 555 in_ialink(ia); 556 ifa_iflink(ifa, ifp, 1); 557 558 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 559 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 560 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 561 ia->ia_sockmask.sin_len = 8; 562 ia->ia_sockmask.sin_family = AF_INET; 563 if (ifp->if_flags & IFF_BROADCAST) { 564 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr; 565 ia->ia_broadaddr.sin_family = AF_INET; 566 } 567 ia->ia_ifp = ifp; 568 if (!(ifp->if_flags & IFF_LOOPBACK)) 569 in_interfaces++; 570 iaIsNew = 1; 571 572 crit_exit(); 573 } 574 break; 575 576 case SIOCSIFBRDADDR: 577 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 578 return error; 579 /* FALLTHROUGH */ 580 581 case SIOCGIFADDR: 582 case SIOCGIFNETMASK: 583 case SIOCGIFDSTADDR: 584 case SIOCGIFBRDADDR: 585 if (ia == NULL) 586 return (EADDRNOTAVAIL); 587 break; 588 } 589 590 switch (cmd) { 591 case SIOCGIFADDR: 592 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 593 return (0); 594 595 case SIOCGIFBRDADDR: 596 if ((ifp->if_flags & IFF_BROADCAST) == 0) 597 return (EINVAL); 598 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 599 return (0); 600 601 case SIOCGIFDSTADDR: 602 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 603 return (EINVAL); 604 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 605 return (0); 606 607 case SIOCGIFNETMASK: 608 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 609 return (0); 610 611 case SIOCSIFDSTADDR: 612 KKASSERT(ifp->if_flags & IFF_POINTOPOINT); 613 614 oldaddr = ia->ia_dstaddr; 615 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 616 if (ifp->if_ioctl != NULL) { 617 ifnet_serialize_all(ifp); 618 error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia, 619 td->td_proc->p_ucred); 620 ifnet_deserialize_all(ifp); 621 if (error) { 622 ia->ia_dstaddr = oldaddr; 623 return (error); 624 } 625 } 626 if (ia->ia_flags & IFA_ROUTE) { 627 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 628 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 629 ia->ia_ifa.ifa_dstaddr = 630 (struct sockaddr *)&ia->ia_dstaddr; 631 rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP); 632 } 633 return (0); 634 635 case SIOCSIFBRDADDR: 636 if ((ifp->if_flags & IFF_BROADCAST) == 0) 637 return (EINVAL); 638 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 639 return (0); 640 641 case SIOCSIFADDR: 642 error = in_ifinit(ifp, ia, 643 (const struct sockaddr_in *)&ifr->ifr_addr, 1); 644 if (error != 0 && iaIsNew) 645 break; 646 if (error == 0) { 647 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 648 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 649 &ia->ia_ifa); 650 } 651 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) { 652 /* 653 * Interface is brought up by in_ifinit() 654 * (via ifp->if_ioctl). We act as if the 655 * interface got IFF_UP flag turned on. 656 */ 657 if_up(ifp); 658 } 659 return (0); 660 661 case SIOCSIFNETMASK: 662 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 663 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 664 return (0); 665 666 case SIOCAIFADDR: 667 maskIsNew = 0; 668 hostIsNew = 1; 669 error = 0; 670 if (ia->ia_addr.sin_family == AF_INET) { 671 if (ifra->ifra_addr.sin_len == 0) { 672 ifra->ifra_addr = ia->ia_addr; 673 hostIsNew = 0; 674 } else if (ifra->ifra_addr.sin_addr.s_addr == 675 ia->ia_addr.sin_addr.s_addr) { 676 hostIsNew = 0; 677 } 678 } 679 if (ifra->ifra_mask.sin_len) { 680 in_ifscrub(ifp, ia); 681 ia->ia_sockmask = ifra->ifra_mask; 682 ia->ia_sockmask.sin_family = AF_INET; 683 ia->ia_subnetmask = 684 ntohl(ia->ia_sockmask.sin_addr.s_addr); 685 maskIsNew = 1; 686 } 687 if ((ifp->if_flags & IFF_POINTOPOINT) && 688 ifra->ifra_dstaddr.sin_family == AF_INET) { 689 in_ifscrub(ifp, ia); 690 ia->ia_dstaddr = ifra->ifra_dstaddr; 691 maskIsNew = 1; /* We lie; but the effect's the same */ 692 } 693 if (ifra->ifra_addr.sin_family == AF_INET && 694 (hostIsNew || maskIsNew)) 695 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 696 697 if (error != 0 && iaIsNew) 698 break; 699 700 if ((ifp->if_flags & IFF_BROADCAST) && 701 ifra->ifra_broadaddr.sin_family == AF_INET) 702 ia->ia_broadaddr = ifra->ifra_broadaddr; 703 if (error == 0) { 704 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 705 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 706 &ia->ia_ifa); 707 } 708 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) { 709 /* See the comment in SIOCSIFADDR */ 710 if_up(ifp); 711 } 712 return (error); 713 714 case SIOCDIFADDR: 715 /* 716 * in_ifscrub kills the interface route. 717 */ 718 in_ifscrub(ifp, ia); 719 /* 720 * in_ifadown gets rid of all the rest of 721 * the routes. This is not quite the right 722 * thing to do, but at least if we are running 723 * a routing process they will come back. 724 */ 725 in_ifadown(&ia->ia_ifa, 1); 726 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE, 727 &ia->ia_ifa); 728 error = 0; 729 break; 730 731 default: 732 if (ifp == NULL || ifp->if_ioctl == NULL) 733 return (EOPNOTSUPP); 734 ifnet_serialize_all(ifp); 735 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred); 736 ifnet_deserialize_all(ifp); 737 return (error); 738 } 739 740 KKASSERT(cmd == SIOCDIFADDR || 741 ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && iaIsNew)); 742 743 ifa_ifunlink(&ia->ia_ifa, ifp); 744 in_iaunlink(ia); 745 746 if (cmd == SIOCDIFADDR) { 747 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 748 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) 749 in_iahash_remove(ia); 750 } 751 #ifdef INVARIANTS 752 else { 753 /* 754 * If cmd is SIOCSIFADDR or SIOCAIFADDR, in_ifinit() has 755 * already taken care of the deletion from hash table 756 */ 757 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 758 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0, 759 ("SIOC%cIFADDR failed on new ia, " 760 "but the new ia is still in hash table\n", 761 cmd == SIOCSIFADDR ? 'S' : 'A')); 762 } 763 #endif 764 765 ifa_destroy(&ia->ia_ifa); 766 767 if ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && 768 !ifpWasUp && (ifp->if_flags & IFF_UP)) { 769 /* 770 * Though the address assignment failed, the 771 * interface is brought up by in_ifinit() 772 * (via ifp->if_ioctl). With the hope that 773 * the interface has some valid addresses, we 774 * act as if IFF_UP flag was just set on the 775 * interface. 776 * 777 * NOTE: 778 * This could only be done after the failed 779 * address is unlinked from the global address 780 * list. 781 */ 782 if_up(ifp); 783 } 784 785 return (error); 786 } 787 788 /* 789 * SIOC[GAD]LIFADDR. 790 * SIOCGLIFADDR: get first address. (?!?) 791 * SIOCGLIFADDR with IFLR_PREFIX: 792 * get first address that matches the specified prefix. 793 * SIOCALIFADDR: add the specified address. 794 * SIOCALIFADDR with IFLR_PREFIX: 795 * EINVAL since we can't deduce hostid part of the address. 796 * SIOCDLIFADDR: delete the specified address. 797 * SIOCDLIFADDR with IFLR_PREFIX: 798 * delete the first address that matches the specified prefix. 799 * return values: 800 * EINVAL on invalid parameters 801 * EADDRNOTAVAIL on prefix match failed/specified address not found 802 * other values may be returned from in_ioctl() 803 * 804 * NOTE! td might be NULL. 805 */ 806 static int 807 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 808 struct thread *td) 809 { 810 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 811 812 /* sanity checks */ 813 if (!data || !ifp) { 814 panic("invalid argument to in_lifaddr_ioctl"); 815 /*NOTRECHED*/ 816 } 817 818 switch (cmd) { 819 case SIOCGLIFADDR: 820 /* address must be specified on GET with IFLR_PREFIX */ 821 if ((iflr->flags & IFLR_PREFIX) == 0) 822 break; 823 /*FALLTHROUGH*/ 824 case SIOCALIFADDR: 825 case SIOCDLIFADDR: 826 /* address must be specified on ADD and DELETE */ 827 if (iflr->addr.ss_family != AF_INET) 828 return EINVAL; 829 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 830 return EINVAL; 831 /* XXX need improvement */ 832 if (iflr->dstaddr.ss_family 833 && iflr->dstaddr.ss_family != AF_INET) 834 return EINVAL; 835 if (iflr->dstaddr.ss_family 836 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 837 return EINVAL; 838 break; 839 default: /*shouldn't happen*/ 840 return EOPNOTSUPP; 841 } 842 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 843 return EINVAL; 844 845 switch (cmd) { 846 case SIOCALIFADDR: 847 { 848 struct in_aliasreq ifra; 849 850 if (iflr->flags & IFLR_PREFIX) 851 return EINVAL; 852 853 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 854 bzero(&ifra, sizeof ifra); 855 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name); 856 857 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 858 859 if (iflr->dstaddr.ss_family) { /*XXX*/ 860 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 861 iflr->dstaddr.ss_len); 862 } 863 864 ifra.ifra_mask.sin_family = AF_INET; 865 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 866 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 867 868 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 869 } 870 case SIOCGLIFADDR: 871 case SIOCDLIFADDR: 872 { 873 struct ifaddr_container *ifac; 874 struct in_ifaddr *ia; 875 struct in_addr mask, candidate, match; 876 struct sockaddr_in *sin; 877 int cmp; 878 879 bzero(&mask, sizeof mask); 880 if (iflr->flags & IFLR_PREFIX) { 881 /* lookup a prefix rather than address. */ 882 in_len2mask(&mask, iflr->prefixlen); 883 884 sin = (struct sockaddr_in *)&iflr->addr; 885 match.s_addr = sin->sin_addr.s_addr; 886 match.s_addr &= mask.s_addr; 887 888 /* if you set extra bits, that's wrong */ 889 if (match.s_addr != sin->sin_addr.s_addr) 890 return EINVAL; 891 892 cmp = 1; 893 } else { 894 if (cmd == SIOCGLIFADDR) { 895 /* on getting an address, take the 1st match */ 896 match.s_addr = 0; /* gcc4 warning */ 897 cmp = 0; /*XXX*/ 898 } else { 899 /* on deleting an address, do exact match */ 900 in_len2mask(&mask, 32); 901 sin = (struct sockaddr_in *)&iflr->addr; 902 match.s_addr = sin->sin_addr.s_addr; 903 904 cmp = 1; 905 } 906 } 907 908 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 909 struct ifaddr *ifa = ifac->ifa; 910 911 if (ifa->ifa_addr->sa_family != AF_INET6) 912 continue; 913 if (!cmp) 914 break; 915 candidate.s_addr = 916 ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 917 candidate.s_addr &= mask.s_addr; 918 if (candidate.s_addr == match.s_addr) 919 break; 920 } 921 if (ifac == NULL) 922 return EADDRNOTAVAIL; 923 ia = (struct in_ifaddr *)(ifac->ifa); 924 925 if (cmd == SIOCGLIFADDR) { 926 /* fill in the if_laddrreq structure */ 927 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 928 929 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 930 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 931 ia->ia_dstaddr.sin_len); 932 } else 933 bzero(&iflr->dstaddr, sizeof iflr->dstaddr); 934 935 iflr->prefixlen = 936 in_mask2len(&ia->ia_sockmask.sin_addr); 937 938 iflr->flags = 0; /*XXX*/ 939 940 return 0; 941 } else { 942 struct in_aliasreq ifra; 943 944 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 945 bzero(&ifra, sizeof ifra); 946 bcopy(iflr->iflr_name, ifra.ifra_name, 947 sizeof ifra.ifra_name); 948 949 bcopy(&ia->ia_addr, &ifra.ifra_addr, 950 ia->ia_addr.sin_len); 951 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 952 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 953 ia->ia_dstaddr.sin_len); 954 } 955 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 956 ia->ia_sockmask.sin_len); 957 958 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 959 ifp, td); 960 } 961 } 962 } 963 964 return EOPNOTSUPP; /*just for safety*/ 965 } 966 967 /* 968 * Delete any existing route for an interface. 969 */ 970 void 971 in_ifscrub(struct ifnet *ifp __unused, struct in_ifaddr *ia) 972 { 973 in_scrubprefix(ia); 974 } 975 976 /* 977 * Initialize an interface's internet address 978 * and routing table entry. 979 */ 980 static int 981 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, 982 const struct sockaddr_in *sin, int scrub) 983 { 984 u_long i = ntohl(sin->sin_addr.s_addr); 985 struct sockaddr_in oldaddr; 986 struct ifaddr_container *ifac; 987 int flags = RTF_UP, error = 0; 988 int was_hash = 0; 989 990 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 991 oldaddr = ia->ia_addr; 992 993 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) { 994 was_hash = 1; 995 in_iahash_remove(ia); 996 } 997 998 ia->ia_addr = *sin; 999 if (ia->ia_addr.sin_family == AF_INET) 1000 in_iahash_insert(ia); 1001 1002 /* 1003 * Give the interface a chance to initialize 1004 * if this is its first address, 1005 * and to validate the address if necessary. 1006 */ 1007 if (ifp->if_ioctl != NULL) { 1008 ifnet_serialize_all(ifp); 1009 error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL); 1010 ifnet_deserialize_all(ifp); 1011 if (error) 1012 goto fail; 1013 } 1014 1015 /* 1016 * Delete old route, if requested. 1017 */ 1018 if (scrub) { 1019 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 1020 in_ifscrub(ifp, ia); 1021 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1022 } 1023 1024 /* 1025 * Calculate netmask/subnetmask. 1026 */ 1027 if (IN_CLASSA(i)) 1028 ia->ia_netmask = IN_CLASSA_NET; 1029 else if (IN_CLASSB(i)) 1030 ia->ia_netmask = IN_CLASSB_NET; 1031 else 1032 ia->ia_netmask = IN_CLASSC_NET; 1033 /* 1034 * The subnet mask usually includes at least the standard network part, 1035 * but may may be smaller in the case of supernetting. 1036 * If it is set, we believe it. 1037 */ 1038 if (ia->ia_subnetmask == 0) { 1039 ia->ia_subnetmask = ia->ia_netmask; 1040 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 1041 } else { 1042 ia->ia_netmask &= ia->ia_subnetmask; 1043 } 1044 ia->ia_net = i & ia->ia_netmask; 1045 ia->ia_subnet = i & ia->ia_subnetmask; 1046 in_socktrim(&ia->ia_sockmask); 1047 1048 /* 1049 * Add route for the network. 1050 */ 1051 ia->ia_ifa.ifa_metric = ifp->if_metric; 1052 if (ifp->if_flags & IFF_BROADCAST) { 1053 ia->ia_broadaddr.sin_addr.s_addr = 1054 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 1055 ia->ia_netbroadcast.s_addr = 1056 htonl(ia->ia_net | ~ ia->ia_netmask); 1057 } else if (ifp->if_flags & IFF_LOOPBACK) { 1058 ia->ia_dstaddr = ia->ia_addr; 1059 flags |= RTF_HOST; 1060 } else if (ifp->if_flags & IFF_POINTOPOINT) { 1061 if (ia->ia_dstaddr.sin_family != AF_INET) 1062 return (0); 1063 flags |= RTF_HOST; 1064 } 1065 1066 /*- 1067 * Don't add host routes for interface addresses of 1068 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it 1069 * possible to assign several such address pairs with consistent 1070 * results (no host route) and is required by BOOTP. 1071 * 1072 * XXX: This is ugly ! There should be a way for the caller to 1073 * say that they don't want a host route. 1074 */ 1075 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY || 1076 ia->ia_netmask != IN_CLASSA_NET || 1077 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) { 1078 error = in_addprefix(ia, flags); 1079 if (error) 1080 goto fail; 1081 } 1082 1083 /* 1084 * If the interface supports multicast, join the "all hosts" 1085 * multicast group on that interface. 1086 */ 1087 if (ifp->if_flags & IFF_MULTICAST) { 1088 struct in_addr addr; 1089 1090 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 1091 in_addmulti(&addr, ifp); 1092 } 1093 return (0); 1094 fail: 1095 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) 1096 in_iahash_remove(ia); 1097 1098 ia->ia_addr = oldaddr; 1099 if (was_hash) 1100 in_iahash_insert(ia); 1101 return (error); 1102 } 1103 1104 #define rtinitflags(x) \ 1105 (((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) \ 1106 ? RTF_HOST : 0) 1107 1108 /* 1109 * Add a route to prefix ("connected route" in cisco terminology). 1110 * Do nothing, if there are some interface addresses with the same 1111 * prefix already. This function assumes that the 'target' parent 1112 * interface is UP. 1113 */ 1114 static int 1115 in_addprefix(struct in_ifaddr *target, int flags) 1116 { 1117 struct in_ifaddr_container *iac; 1118 struct in_addr prefix, mask; 1119 int error; 1120 1121 mask = target->ia_sockmask.sin_addr; 1122 if (flags & RTF_HOST) { 1123 prefix = target->ia_dstaddr.sin_addr; 1124 } else { 1125 prefix = target->ia_addr.sin_addr; 1126 prefix.s_addr &= mask.s_addr; 1127 } 1128 1129 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 1130 struct in_ifaddr *ia = iac->ia; 1131 struct in_addr p; 1132 1133 /* Don't test against self */ 1134 if (ia == target) 1135 continue; 1136 1137 /* The tested address does not own a route entry */ 1138 if ((ia->ia_flags & IFA_ROUTE) == 0) 1139 continue; 1140 1141 /* Prefix test */ 1142 if (rtinitflags(ia)) { 1143 p = ia->ia_dstaddr.sin_addr; 1144 } else { 1145 p = ia->ia_addr.sin_addr; 1146 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1147 } 1148 if (prefix.s_addr != p.s_addr) 1149 continue; 1150 1151 /* 1152 * If the to-be-added address and the curretly being 1153 * tested address are not host addresses, we need to 1154 * take subnetmask into consideration. 1155 */ 1156 if (!(flags & RTF_HOST) && !rtinitflags(ia) && 1157 mask.s_addr != ia->ia_sockmask.sin_addr.s_addr) 1158 continue; 1159 1160 /* 1161 * If we got a matching prefix route inserted by other 1162 * interface address, we don't need to bother. 1163 */ 1164 return 0; 1165 } 1166 1167 /* 1168 * No one seem to have prefix route; insert it. 1169 */ 1170 error = rtinit(&target->ia_ifa, RTM_ADD, flags); 1171 if (!error) 1172 target->ia_flags |= IFA_ROUTE; 1173 return error; 1174 } 1175 1176 /* 1177 * Remove a route to prefix ("connected route" in cisco terminology). 1178 * Re-installs the route by using another interface address, if there's 1179 * one with the same prefix (otherwise we lose the route mistakenly). 1180 */ 1181 static void 1182 in_scrubprefix(struct in_ifaddr *target) 1183 { 1184 struct in_ifaddr_container *iac; 1185 struct in_addr prefix, mask; 1186 int error; 1187 1188 if ((target->ia_flags & IFA_ROUTE) == 0) 1189 return; 1190 1191 mask = target->ia_sockmask.sin_addr; 1192 if (rtinitflags(target)) { 1193 prefix = target->ia_dstaddr.sin_addr; 1194 } else { 1195 prefix = target->ia_addr.sin_addr; 1196 prefix.s_addr &= mask.s_addr; 1197 } 1198 1199 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 1200 struct in_ifaddr *ia = iac->ia; 1201 struct in_addr p; 1202 1203 /* Don't test against self */ 1204 if (ia == target) 1205 continue; 1206 1207 /* The tested address already owns a route entry */ 1208 if (ia->ia_flags & IFA_ROUTE) 1209 continue; 1210 1211 /* 1212 * The prefix route of the tested address should 1213 * never be installed if its parent interface is 1214 * not UP yet. 1215 */ 1216 if ((ia->ia_ifp->if_flags & IFF_UP) == 0) 1217 continue; 1218 1219 /* Prefix test */ 1220 if (rtinitflags(ia)) { 1221 p = ia->ia_dstaddr.sin_addr; 1222 } else { 1223 p = ia->ia_addr.sin_addr; 1224 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1225 } 1226 if (prefix.s_addr != p.s_addr) 1227 continue; 1228 1229 /* 1230 * We don't need to test subnetmask here, as what we do 1231 * in in_addprefix(), since if the the tested address's 1232 * parent interface is UP, the tested address should own 1233 * a prefix route entry and we would never reach here. 1234 */ 1235 1236 /* 1237 * If we got a matching prefix route, move IFA_ROUTE to him 1238 */ 1239 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target)); 1240 target->ia_flags &= ~IFA_ROUTE; 1241 1242 error = rtinit(&ia->ia_ifa, RTM_ADD, rtinitflags(ia) | RTF_UP); 1243 if (!error) 1244 ia->ia_flags |= IFA_ROUTE; 1245 return; 1246 } 1247 1248 /* 1249 * No candidates for this prefix route; just remove it. 1250 */ 1251 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target)); 1252 target->ia_flags &= ~IFA_ROUTE; 1253 } 1254 1255 #undef rtinitflags 1256 1257 /* 1258 * Return 1 if the address might be a local broadcast address. 1259 */ 1260 int 1261 in_broadcast(struct in_addr in, struct ifnet *ifp) 1262 { 1263 struct ifaddr_container *ifac; 1264 u_long t; 1265 1266 if (in.s_addr == INADDR_BROADCAST || 1267 in.s_addr == INADDR_ANY) 1268 return 1; 1269 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1270 return 0; 1271 t = ntohl(in.s_addr); 1272 /* 1273 * Look through the list of addresses for a match 1274 * with a broadcast address. 1275 */ 1276 #define ia ((struct in_ifaddr *)ifa) 1277 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1278 struct ifaddr *ifa = ifac->ifa; 1279 1280 if (ifa->ifa_addr->sa_family == AF_INET && 1281 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1282 in.s_addr == ia->ia_netbroadcast.s_addr || 1283 /* 1284 * Check for old-style (host 0) broadcast. 1285 */ 1286 t == ia->ia_subnet || t == ia->ia_net) && 1287 /* 1288 * Check for an all one subnetmask. These 1289 * only exist when an interface gets a secondary 1290 * address. 1291 */ 1292 ia->ia_subnetmask != (u_long)0xffffffff) 1293 return 1; 1294 } 1295 return (0); 1296 #undef ia 1297 } 1298 /* 1299 * Add an address to the list of IP multicast addresses for a given interface. 1300 */ 1301 struct in_multi * 1302 in_addmulti(struct in_addr *ap, struct ifnet *ifp) 1303 { 1304 struct in_multi *inm; 1305 int error; 1306 struct sockaddr_in sin; 1307 struct ifmultiaddr *ifma; 1308 1309 /* 1310 * Call generic routine to add membership or increment 1311 * refcount. It wants addresses in the form of a sockaddr, 1312 * so we build one here (being careful to zero the unused bytes). 1313 */ 1314 bzero(&sin, sizeof sin); 1315 sin.sin_family = AF_INET; 1316 sin.sin_len = sizeof sin; 1317 sin.sin_addr = *ap; 1318 crit_enter(); 1319 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 1320 if (error) { 1321 crit_exit(); 1322 return 0; 1323 } 1324 1325 /* 1326 * If ifma->ifma_protospec is null, then if_addmulti() created 1327 * a new record. Otherwise, we are done. 1328 */ 1329 if (ifma->ifma_protospec != 0) { 1330 crit_exit(); 1331 return ifma->ifma_protospec; 1332 } 1333 1334 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 1335 at interrupt time? If so, need to fix if_addmulti. XXX */ 1336 inm = kmalloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO); 1337 inm->inm_addr = *ap; 1338 inm->inm_ifp = ifp; 1339 inm->inm_ifma = ifma; 1340 ifma->ifma_protospec = inm; 1341 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 1342 1343 /* 1344 * Let IGMP know that we have joined a new IP multicast group. 1345 */ 1346 igmp_joingroup(inm); 1347 crit_exit(); 1348 return (inm); 1349 } 1350 1351 /* 1352 * Delete a multicast address record. 1353 */ 1354 void 1355 in_delmulti(struct in_multi *inm) 1356 { 1357 struct ifmultiaddr *ifma; 1358 struct in_multi my_inm; 1359 1360 crit_enter(); 1361 ifma = inm->inm_ifma; 1362 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 1363 if (ifma->ifma_refcount == 1) { 1364 /* 1365 * No remaining claims to this record; let IGMP know that 1366 * we are leaving the multicast group. 1367 * But do it after the if_delmulti() which might reset 1368 * the interface and nuke the packet. 1369 */ 1370 my_inm = *inm ; 1371 ifma->ifma_protospec = 0; 1372 LIST_REMOVE(inm, inm_link); 1373 kfree(inm, M_IPMADDR); 1374 } 1375 /* XXX - should be separate API for when we have an ifma? */ 1376 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1377 if (my_inm.inm_ifp != NULL) 1378 igmp_leavegroup(&my_inm); 1379 crit_exit(); 1380 } 1381 1382 void 1383 in_ifdetach(struct ifnet *ifp) 1384 { 1385 in_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp); 1386 in_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp); 1387 } 1388