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 #include "opt_carp.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/sockio.h> 44 #include <sys/malloc.h> 45 #include <sys/proc.h> 46 #include <sys/priv.h> 47 #include <sys/msgport.h> 48 #include <sys/socket.h> 49 50 #include <sys/kernel.h> 51 #include <sys/sysctl.h> 52 #include <sys/thread2.h> 53 54 #include <net/if.h> 55 #include <net/if_types.h> 56 #include <net/route.h> 57 #include <net/netmsg2.h> 58 59 #include <netinet/in.h> 60 #include <netinet/in_var.h> 61 #include <netinet/in_pcb.h> 62 #include <netinet/udp_var.h> 63 64 #include <netinet/igmp_var.h> 65 66 MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address"); 67 68 static int in_mask2len (struct in_addr *); 69 static void in_len2mask (struct in_addr *, int); 70 static int in_lifaddr_ioctl (struct socket *, u_long, caddr_t, 71 struct ifnet *, struct thread *); 72 73 static void in_socktrim (struct sockaddr_in *); 74 static int in_ifinit(struct ifnet *, struct in_ifaddr *, 75 const struct sockaddr_in *, int); 76 77 static int in_control_internal(u_long, caddr_t, struct ifnet *, 78 struct thread *); 79 static int in_control_redispatch(u_long, caddr_t, struct ifnet *, 80 struct thread *); 81 82 static int in_addprefix(struct in_ifaddr *, int); 83 static void in_scrubprefix(struct in_ifaddr *); 84 85 static int subnetsarelocal = 0; 86 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 87 &subnetsarelocal, 0, 88 "Count all internet addresses of subnets of the local net as local"); 89 90 struct in_multihead in_multihead; /* XXX BSS initialization */ 91 92 extern struct inpcbinfo ripcbinfo; 93 94 /* 95 * Return 1 if an internet address is for a ``local'' host 96 * (one to which we have a connection). If subnetsarelocal 97 * is true, this includes other subnets of the local net. 98 * Otherwise, it includes only the directly-connected (sub)nets. 99 */ 100 int 101 in_localaddr(struct in_addr in) 102 { 103 u_long i = ntohl(in.s_addr); 104 struct in_ifaddr_container *iac; 105 struct in_ifaddr *ia; 106 107 if (subnetsarelocal) { 108 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 109 ia = iac->ia; 110 111 if ((i & ia->ia_netmask) == ia->ia_net) 112 return (1); 113 } 114 } else { 115 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 116 ia = iac->ia; 117 118 if ((i & ia->ia_subnetmask) == ia->ia_subnet) 119 return (1); 120 } 121 } 122 return (0); 123 } 124 125 /* 126 * Determine whether an IP address is in a reserved set of addresses 127 * that may not be forwarded, or whether datagrams to that destination 128 * may be forwarded. 129 */ 130 int 131 in_canforward(struct in_addr in) 132 { 133 u_long i = ntohl(in.s_addr); 134 u_long net; 135 136 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) 137 return (0); 138 if (IN_CLASSA(i)) { 139 net = i & IN_CLASSA_NET; 140 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 141 return (0); 142 } 143 return (1); 144 } 145 146 /* 147 * Trim a mask in a sockaddr 148 */ 149 static void 150 in_socktrim(struct sockaddr_in *ap) 151 { 152 char *cplim = (char *) &ap->sin_addr; 153 char *cp = (char *) (&ap->sin_addr + 1); 154 155 ap->sin_len = 0; 156 while (--cp >= cplim) 157 if (*cp) { 158 (ap)->sin_len = cp - (char *) (ap) + 1; 159 break; 160 } 161 } 162 163 static int 164 in_mask2len(struct in_addr *mask) 165 { 166 int x, y; 167 u_char *p; 168 169 p = (u_char *)mask; 170 for (x = 0; x < sizeof *mask; x++) { 171 if (p[x] != 0xff) 172 break; 173 } 174 y = 0; 175 if (x < sizeof *mask) { 176 for (y = 0; y < 8; y++) { 177 if ((p[x] & (0x80 >> y)) == 0) 178 break; 179 } 180 } 181 return x * 8 + y; 182 } 183 184 static void 185 in_len2mask(struct in_addr *mask, int len) 186 { 187 int i; 188 u_char *p; 189 190 p = (u_char *)mask; 191 bzero(mask, sizeof *mask); 192 for (i = 0; i < len / 8; i++) 193 p[i] = 0xff; 194 if (len % 8) 195 p[i] = (0xff00 >> (len % 8)) & 0xff; 196 } 197 198 static int in_interfaces; /* number of external internet interfaces */ 199 200 void 201 in_control_dispatch(netmsg_t msg) 202 { 203 int error; 204 205 error = in_control_redispatch(msg->control.nm_cmd, 206 msg->control.nm_data, 207 msg->control.nm_ifp, 208 msg->control.nm_td); 209 lwkt_replymsg(&msg->lmsg, error); 210 } 211 212 static void 213 in_control_internal_dispatch(netmsg_t msg) 214 { 215 int error; 216 217 error = in_control_internal(msg->control.nm_cmd, 218 msg->control.nm_data, 219 msg->control.nm_ifp, 220 msg->control.nm_td); 221 lwkt_replymsg(&msg->lmsg, error); 222 } 223 224 static int 225 in_control_redispatch(u_long cmd, caddr_t data, struct ifnet *ifp, 226 struct thread *td) 227 { 228 struct netmsg_pru_control msg; 229 int error; 230 231 /* 232 * IFADDR alterations are serialized by netisr0 233 */ 234 switch (cmd) { 235 case SIOCSIFDSTADDR: 236 case SIOCSIFBRDADDR: 237 case SIOCSIFADDR: 238 case SIOCSIFNETMASK: 239 case SIOCAIFADDR: 240 case SIOCDIFADDR: 241 netmsg_init(&msg.base, NULL, &curthread->td_msgport, 242 0, in_control_internal_dispatch); 243 msg.nm_cmd = cmd; 244 msg.nm_data = data; 245 msg.nm_ifp = ifp; 246 msg.nm_td = td; 247 lwkt_domsg(cpu_portfn(0), &msg.base.lmsg, 0); 248 error = msg.base.lmsg.ms_error; 249 break; 250 251 default: 252 error = in_control_internal(cmd, data, ifp, td); 253 break; 254 } 255 return error; 256 } 257 258 /* 259 * Generic internet control operations (ioctl's). 260 * Ifp is 0 if not an interface-specific ioctl. 261 * 262 * NOTE! td might be NULL. 263 */ 264 /* ARGSUSED */ 265 int 266 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 267 struct thread *td) 268 { 269 int error; 270 271 switch (cmd) { 272 case SIOCALIFADDR: 273 case SIOCDLIFADDR: 274 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 275 return error; 276 /* FALLTHROUGH */ 277 case SIOCGLIFADDR: 278 if (!ifp) 279 return EINVAL; 280 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 281 } 282 283 KASSERT(cmd != SIOCALIFADDR && cmd != SIOCDLIFADDR, 284 ("recursive SIOC%cLIFADDR!\n", 285 cmd == SIOCDLIFADDR ? 'D' : 'A')); 286 287 return in_control_redispatch(cmd, data, ifp, td); 288 } 289 290 static void 291 in_ialink_dispatch(netmsg_t msg) 292 { 293 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 294 struct ifaddr_container *ifac; 295 struct in_ifaddr_container *iac; 296 int cpu = mycpuid; 297 298 crit_enter(); 299 300 ifac = &ia->ia_ifa.ifa_containers[cpu]; 301 ASSERT_IFAC_VALID(ifac); 302 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD) == 0, 303 ("ia is on in_ifaddrheads\n")); 304 305 ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHEAD; 306 iac = &ifac->ifa_proto_u.u_in_ifac; 307 TAILQ_INSERT_TAIL(&in_ifaddrheads[cpu], iac, ia_link); 308 309 crit_exit(); 310 311 ifa_forwardmsg(&msg->lmsg, cpu + 1); 312 } 313 314 static void 315 in_iaunlink_dispatch(netmsg_t msg) 316 { 317 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 318 struct ifaddr_container *ifac; 319 struct in_ifaddr_container *iac; 320 int cpu = mycpuid; 321 322 crit_enter(); 323 324 ifac = &ia->ia_ifa.ifa_containers[cpu]; 325 ASSERT_IFAC_VALID(ifac); 326 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD, 327 ("ia is not on in_ifaddrheads\n")); 328 329 iac = &ifac->ifa_proto_u.u_in_ifac; 330 TAILQ_REMOVE(&in_ifaddrheads[cpu], iac, ia_link); 331 ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHEAD; 332 333 crit_exit(); 334 335 ifa_forwardmsg(&msg->lmsg, cpu + 1); 336 } 337 338 static void 339 in_iahashins_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) == 0, 351 ("ia is on in_ifaddrhashtbls\n")); 352 353 ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHASH; 354 iac = &ifac->ifa_proto_u.u_in_ifac; 355 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 356 iac, ia_hash); 357 358 crit_exit(); 359 360 ifa_forwardmsg(&msg->lmsg, cpu + 1); 361 } 362 363 static void 364 in_iahashrem_dispatch(netmsg_t msg) 365 { 366 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 367 struct ifaddr_container *ifac; 368 struct in_ifaddr_container *iac; 369 int cpu = mycpuid; 370 371 crit_enter(); 372 373 ifac = &ia->ia_ifa.ifa_containers[cpu]; 374 ASSERT_IFAC_VALID(ifac); 375 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH, 376 ("ia is not on in_ifaddrhashtbls\n")); 377 378 iac = &ifac->ifa_proto_u.u_in_ifac; 379 LIST_REMOVE(iac, ia_hash); 380 ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHASH; 381 382 crit_exit(); 383 384 ifa_forwardmsg(&msg->lmsg, cpu + 1); 385 } 386 387 static void 388 in_ialink(struct in_ifaddr *ia) 389 { 390 struct netmsg_base msg; 391 392 netmsg_init(&msg, NULL, &curthread->td_msgport, 393 0, in_ialink_dispatch); 394 msg.lmsg.u.ms_resultp = ia; 395 396 ifa_domsg(&msg.lmsg, 0); 397 } 398 399 void 400 in_iaunlink(struct in_ifaddr *ia) 401 { 402 struct netmsg_base msg; 403 404 netmsg_init(&msg, NULL, &curthread->td_msgport, 405 0, in_iaunlink_dispatch); 406 msg.lmsg.u.ms_resultp = ia; 407 408 ifa_domsg(&msg.lmsg, 0); 409 } 410 411 void 412 in_iahash_insert(struct in_ifaddr *ia) 413 { 414 struct netmsg_base msg; 415 416 netmsg_init(&msg, NULL, &curthread->td_msgport, 417 0, in_iahashins_dispatch); 418 msg.lmsg.u.ms_resultp = ia; 419 420 ifa_domsg(&msg.lmsg, 0); 421 } 422 423 void 424 in_iahash_remove(struct in_ifaddr *ia) 425 { 426 struct netmsg_base msg; 427 428 netmsg_init(&msg, NULL, &curthread->td_msgport, 429 0, in_iahashrem_dispatch); 430 msg.lmsg.u.ms_resultp = ia; 431 432 ifa_domsg(&msg.lmsg, 0); 433 } 434 435 static __inline struct in_ifaddr * 436 in_ianext(struct in_ifaddr *oia) 437 { 438 struct ifaddr_container *ifac; 439 struct in_ifaddr_container *iac; 440 441 ifac = &oia->ia_ifa.ifa_containers[mycpuid]; 442 ASSERT_IFAC_VALID(ifac); 443 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD, 444 ("ia is not on in_ifaddrheads\n")); 445 446 iac = &ifac->ifa_proto_u.u_in_ifac; 447 iac = TAILQ_NEXT(iac, ia_link); 448 if (iac != NULL) 449 return iac->ia; 450 else 451 return NULL; 452 } 453 454 static int 455 in_control_internal(u_long cmd, caddr_t data, struct ifnet *ifp, 456 struct thread *td) 457 { 458 struct ifreq *ifr = (struct ifreq *)data; 459 struct in_ifaddr *ia = NULL; 460 struct in_addr dst; 461 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 462 struct ifaddr_container *ifac; 463 struct in_ifaddr_container *iac; 464 struct sockaddr_in oldaddr; 465 int hostIsNew, iaIsNew, maskIsNew, ifpWasUp; 466 int error = 0; 467 468 iaIsNew = 0; 469 ifpWasUp = 0; 470 471 /* 472 * Find address for this interface, if it exists. 473 * 474 * If an alias address was specified, find that one instead of 475 * the first one on the interface, if possible 476 */ 477 if (ifp) { 478 struct in_ifaddr *iap; 479 480 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 481 LIST_FOREACH(iac, INADDR_HASH(dst.s_addr), ia_hash) { 482 iap = iac->ia; 483 if (iap->ia_ifp == ifp && 484 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 485 ia = iap; 486 break; 487 } 488 } 489 if (ia == NULL) { 490 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], 491 ifa_link) { 492 iap = ifatoia(ifac->ifa); 493 if (iap->ia_addr.sin_family == AF_INET) { 494 ia = iap; 495 break; 496 } 497 } 498 } 499 500 if (ifp->if_flags & IFF_UP) 501 ifpWasUp = 1; 502 } 503 504 switch (cmd) { 505 case SIOCAIFADDR: 506 case SIOCDIFADDR: 507 if (ifp == NULL) 508 return (EADDRNOTAVAIL); 509 if (ifra->ifra_addr.sin_family == AF_INET) { 510 while (ia != NULL) { 511 if (ia->ia_ifp == ifp && 512 ia->ia_addr.sin_addr.s_addr == 513 ifra->ifra_addr.sin_addr.s_addr) 514 break; 515 ia = in_ianext(ia); 516 } 517 if ((ifp->if_flags & IFF_POINTOPOINT) && 518 cmd == SIOCAIFADDR && 519 ifra->ifra_dstaddr.sin_addr.s_addr == INADDR_ANY) { 520 return EDESTADDRREQ; 521 } 522 } 523 if (cmd == SIOCDIFADDR && ia == NULL) 524 return (EADDRNOTAVAIL); 525 /* FALLTHROUGH */ 526 case SIOCSIFADDR: 527 case SIOCSIFNETMASK: 528 case SIOCSIFDSTADDR: 529 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 530 return error; 531 532 if (ifp == NULL) 533 return (EADDRNOTAVAIL); 534 535 if (cmd == SIOCSIFDSTADDR && 536 (ifp->if_flags & IFF_POINTOPOINT) == 0) 537 return (EINVAL); 538 539 if (ia == NULL) { 540 struct ifaddr *ifa; 541 int i; 542 543 ia = ifa_create(sizeof(*ia), M_WAITOK); 544 ifa = &ia->ia_ifa; 545 546 /* 547 * Setup per-CPU information 548 */ 549 for (i = 0; i < ncpus; ++i) { 550 ifac = &ifa->ifa_containers[i]; 551 iac = &ifac->ifa_proto_u.u_in_ifac; 552 iac->ia = ia; 553 iac->ia_ifac = ifac; 554 } 555 556 /* 557 * Protect from NETISR_IP traversing address list 558 * while we're modifying it. 559 */ 560 crit_enter(); 561 562 in_ialink(ia); 563 ifa_iflink(ifa, ifp, 1); 564 565 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 566 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 567 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 568 ia->ia_sockmask.sin_len = 8; 569 ia->ia_sockmask.sin_family = AF_INET; 570 if (ifp->if_flags & IFF_BROADCAST) { 571 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr; 572 ia->ia_broadaddr.sin_family = AF_INET; 573 } 574 ia->ia_ifp = ifp; 575 if (!(ifp->if_flags & IFF_LOOPBACK)) 576 in_interfaces++; 577 iaIsNew = 1; 578 579 crit_exit(); 580 } 581 break; 582 583 case SIOCSIFBRDADDR: 584 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 585 return error; 586 /* FALLTHROUGH */ 587 588 case SIOCGIFADDR: 589 case SIOCGIFNETMASK: 590 case SIOCGIFDSTADDR: 591 case SIOCGIFBRDADDR: 592 if (ia == NULL) 593 return (EADDRNOTAVAIL); 594 break; 595 } 596 597 switch (cmd) { 598 case SIOCGIFADDR: 599 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 600 return (0); 601 602 case SIOCGIFBRDADDR: 603 if ((ifp->if_flags & IFF_BROADCAST) == 0) 604 return (EINVAL); 605 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 606 return (0); 607 608 case SIOCGIFDSTADDR: 609 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 610 return (EINVAL); 611 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 612 return (0); 613 614 case SIOCGIFNETMASK: 615 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 616 return (0); 617 618 case SIOCSIFDSTADDR: 619 KKASSERT(ifp->if_flags & IFF_POINTOPOINT); 620 621 oldaddr = ia->ia_dstaddr; 622 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 623 if (ifp->if_ioctl != NULL) { 624 ifnet_serialize_all(ifp); 625 error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia, 626 td->td_proc->p_ucred); 627 ifnet_deserialize_all(ifp); 628 if (error) { 629 ia->ia_dstaddr = oldaddr; 630 return (error); 631 } 632 } 633 if (ia->ia_flags & IFA_ROUTE) { 634 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 635 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 636 ia->ia_ifa.ifa_dstaddr = 637 (struct sockaddr *)&ia->ia_dstaddr; 638 rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP); 639 } 640 return (0); 641 642 case SIOCSIFBRDADDR: 643 if ((ifp->if_flags & IFF_BROADCAST) == 0) 644 return (EINVAL); 645 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 646 return (0); 647 648 case SIOCSIFADDR: 649 error = in_ifinit(ifp, ia, 650 (const struct sockaddr_in *)&ifr->ifr_addr, 1); 651 if (error != 0 && iaIsNew) 652 break; 653 if (error == 0) { 654 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 655 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 656 &ia->ia_ifa); 657 } 658 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) { 659 /* 660 * Interface is brought up by in_ifinit() 661 * (via ifp->if_ioctl). We act as if the 662 * interface got IFF_UP flag turned on. 663 */ 664 if_up(ifp); 665 } 666 return (0); 667 668 case SIOCSIFNETMASK: 669 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 670 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 671 return (0); 672 673 case SIOCAIFADDR: 674 maskIsNew = 0; 675 hostIsNew = 1; 676 error = 0; 677 if (ia->ia_addr.sin_family == AF_INET) { 678 if (ifra->ifra_addr.sin_len == 0) { 679 ifra->ifra_addr = ia->ia_addr; 680 hostIsNew = 0; 681 } else if (ifra->ifra_addr.sin_addr.s_addr == 682 ia->ia_addr.sin_addr.s_addr) { 683 hostIsNew = 0; 684 } 685 } 686 if (ifra->ifra_mask.sin_len) { 687 in_ifscrub(ifp, ia); 688 ia->ia_sockmask = ifra->ifra_mask; 689 ia->ia_sockmask.sin_family = AF_INET; 690 ia->ia_subnetmask = 691 ntohl(ia->ia_sockmask.sin_addr.s_addr); 692 maskIsNew = 1; 693 } 694 if ((ifp->if_flags & IFF_POINTOPOINT) && 695 ifra->ifra_dstaddr.sin_family == AF_INET) { 696 in_ifscrub(ifp, ia); 697 ia->ia_dstaddr = ifra->ifra_dstaddr; 698 maskIsNew = 1; /* We lie; but the effect's the same */ 699 } 700 if (ifra->ifra_addr.sin_family == AF_INET && 701 (hostIsNew || maskIsNew)) 702 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 703 704 if (error != 0 && iaIsNew) 705 break; 706 707 if ((ifp->if_flags & IFF_BROADCAST) && 708 ifra->ifra_broadaddr.sin_family == AF_INET) 709 ia->ia_broadaddr = ifra->ifra_broadaddr; 710 if (error == 0) { 711 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 712 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 713 &ia->ia_ifa); 714 } 715 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) { 716 /* See the comment in SIOCSIFADDR */ 717 if_up(ifp); 718 } 719 return (error); 720 721 case SIOCDIFADDR: 722 /* 723 * in_ifscrub kills the interface route. 724 */ 725 in_ifscrub(ifp, ia); 726 /* 727 * in_ifadown gets rid of all the rest of 728 * the routes. This is not quite the right 729 * thing to do, but at least if we are running 730 * a routing process they will come back. 731 */ 732 in_ifadown(&ia->ia_ifa, 1); 733 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE, 734 &ia->ia_ifa); 735 error = 0; 736 break; 737 738 default: 739 if (ifp == NULL || ifp->if_ioctl == NULL) 740 return (EOPNOTSUPP); 741 ifnet_serialize_all(ifp); 742 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred); 743 ifnet_deserialize_all(ifp); 744 return (error); 745 } 746 747 KKASSERT(cmd == SIOCDIFADDR || 748 ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && iaIsNew)); 749 750 ifa_ifunlink(&ia->ia_ifa, ifp); 751 in_iaunlink(ia); 752 753 if (cmd == SIOCDIFADDR) { 754 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 755 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) 756 in_iahash_remove(ia); 757 } 758 #ifdef INVARIANTS 759 else { 760 /* 761 * If cmd is SIOCSIFADDR or SIOCAIFADDR, in_ifinit() has 762 * already taken care of the deletion from hash table 763 */ 764 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 765 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0, 766 ("SIOC%cIFADDR failed on new ia, " 767 "but the new ia is still in hash table\n", 768 cmd == SIOCSIFADDR ? 'S' : 'A')); 769 } 770 #endif 771 772 ifa_destroy(&ia->ia_ifa); 773 774 if ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && 775 !ifpWasUp && (ifp->if_flags & IFF_UP)) { 776 /* 777 * Though the address assignment failed, the 778 * interface is brought up by in_ifinit() 779 * (via ifp->if_ioctl). With the hope that 780 * the interface has some valid addresses, we 781 * act as if IFF_UP flag was just set on the 782 * interface. 783 * 784 * NOTE: 785 * This could only be done after the failed 786 * address is unlinked from the global address 787 * list. 788 */ 789 if_up(ifp); 790 } 791 792 return (error); 793 } 794 795 /* 796 * SIOC[GAD]LIFADDR. 797 * SIOCGLIFADDR: get first address. (?!?) 798 * SIOCGLIFADDR with IFLR_PREFIX: 799 * get first address that matches the specified prefix. 800 * SIOCALIFADDR: add the specified address. 801 * SIOCALIFADDR with IFLR_PREFIX: 802 * EINVAL since we can't deduce hostid part of the address. 803 * SIOCDLIFADDR: delete the specified address. 804 * SIOCDLIFADDR with IFLR_PREFIX: 805 * delete the first address that matches the specified prefix. 806 * return values: 807 * EINVAL on invalid parameters 808 * EADDRNOTAVAIL on prefix match failed/specified address not found 809 * other values may be returned from in_ioctl() 810 * 811 * NOTE! td might be NULL. 812 */ 813 static int 814 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 815 struct thread *td) 816 { 817 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 818 819 /* sanity checks */ 820 if (!data || !ifp) { 821 panic("invalid argument to in_lifaddr_ioctl"); 822 /*NOTRECHED*/ 823 } 824 825 switch (cmd) { 826 case SIOCGLIFADDR: 827 /* address must be specified on GET with IFLR_PREFIX */ 828 if ((iflr->flags & IFLR_PREFIX) == 0) 829 break; 830 /*FALLTHROUGH*/ 831 case SIOCALIFADDR: 832 case SIOCDLIFADDR: 833 /* address must be specified on ADD and DELETE */ 834 if (iflr->addr.ss_family != AF_INET) 835 return EINVAL; 836 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 837 return EINVAL; 838 /* XXX need improvement */ 839 if (iflr->dstaddr.ss_family 840 && iflr->dstaddr.ss_family != AF_INET) 841 return EINVAL; 842 if (iflr->dstaddr.ss_family 843 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 844 return EINVAL; 845 break; 846 default: /*shouldn't happen*/ 847 return EOPNOTSUPP; 848 } 849 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 850 return EINVAL; 851 852 switch (cmd) { 853 case SIOCALIFADDR: 854 { 855 struct in_aliasreq ifra; 856 857 if (iflr->flags & IFLR_PREFIX) 858 return EINVAL; 859 860 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 861 bzero(&ifra, sizeof ifra); 862 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name); 863 864 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 865 866 if (iflr->dstaddr.ss_family) { /*XXX*/ 867 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 868 iflr->dstaddr.ss_len); 869 } 870 871 ifra.ifra_mask.sin_family = AF_INET; 872 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 873 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 874 875 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 876 } 877 case SIOCGLIFADDR: 878 case SIOCDLIFADDR: 879 { 880 struct ifaddr_container *ifac; 881 struct in_ifaddr *ia; 882 struct in_addr mask, candidate, match; 883 struct sockaddr_in *sin; 884 int cmp; 885 886 bzero(&mask, sizeof mask); 887 if (iflr->flags & IFLR_PREFIX) { 888 /* lookup a prefix rather than address. */ 889 in_len2mask(&mask, iflr->prefixlen); 890 891 sin = (struct sockaddr_in *)&iflr->addr; 892 match.s_addr = sin->sin_addr.s_addr; 893 match.s_addr &= mask.s_addr; 894 895 /* if you set extra bits, that's wrong */ 896 if (match.s_addr != sin->sin_addr.s_addr) 897 return EINVAL; 898 899 cmp = 1; 900 } else { 901 if (cmd == SIOCGLIFADDR) { 902 /* on getting an address, take the 1st match */ 903 match.s_addr = 0; /* gcc4 warning */ 904 cmp = 0; /*XXX*/ 905 } else { 906 /* on deleting an address, do exact match */ 907 in_len2mask(&mask, 32); 908 sin = (struct sockaddr_in *)&iflr->addr; 909 match.s_addr = sin->sin_addr.s_addr; 910 911 cmp = 1; 912 } 913 } 914 915 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 916 struct ifaddr *ifa = ifac->ifa; 917 918 if (ifa->ifa_addr->sa_family != AF_INET6) 919 continue; 920 if (!cmp) 921 break; 922 candidate.s_addr = 923 ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 924 candidate.s_addr &= mask.s_addr; 925 if (candidate.s_addr == match.s_addr) 926 break; 927 } 928 if (ifac == NULL) 929 return EADDRNOTAVAIL; 930 ia = (struct in_ifaddr *)(ifac->ifa); 931 932 if (cmd == SIOCGLIFADDR) { 933 /* fill in the if_laddrreq structure */ 934 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 935 936 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 937 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 938 ia->ia_dstaddr.sin_len); 939 } else 940 bzero(&iflr->dstaddr, sizeof iflr->dstaddr); 941 942 iflr->prefixlen = 943 in_mask2len(&ia->ia_sockmask.sin_addr); 944 945 iflr->flags = 0; /*XXX*/ 946 947 return 0; 948 } else { 949 struct in_aliasreq ifra; 950 951 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 952 bzero(&ifra, sizeof ifra); 953 bcopy(iflr->iflr_name, ifra.ifra_name, 954 sizeof ifra.ifra_name); 955 956 bcopy(&ia->ia_addr, &ifra.ifra_addr, 957 ia->ia_addr.sin_len); 958 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 959 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 960 ia->ia_dstaddr.sin_len); 961 } 962 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 963 ia->ia_sockmask.sin_len); 964 965 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 966 ifp, td); 967 } 968 } 969 } 970 971 return EOPNOTSUPP; /*just for safety*/ 972 } 973 974 /* 975 * Delete any existing route for an interface. 976 */ 977 void 978 in_ifscrub(struct ifnet *ifp __unused, struct in_ifaddr *ia) 979 { 980 in_scrubprefix(ia); 981 } 982 983 /* 984 * Initialize an interface's internet address 985 * and routing table entry. 986 */ 987 static int 988 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, 989 const struct sockaddr_in *sin, int scrub) 990 { 991 u_long i = ntohl(sin->sin_addr.s_addr); 992 struct sockaddr_in oldaddr; 993 struct ifaddr_container *ifac; 994 int flags = RTF_UP, error = 0; 995 int was_hash = 0; 996 997 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 998 oldaddr = ia->ia_addr; 999 1000 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) { 1001 was_hash = 1; 1002 in_iahash_remove(ia); 1003 } 1004 1005 ia->ia_addr = *sin; 1006 if (ia->ia_addr.sin_family == AF_INET) 1007 in_iahash_insert(ia); 1008 1009 /* 1010 * Give the interface a chance to initialize 1011 * if this is its first address, 1012 * and to validate the address if necessary. 1013 */ 1014 if (ifp->if_ioctl != NULL) { 1015 ifnet_serialize_all(ifp); 1016 error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL); 1017 ifnet_deserialize_all(ifp); 1018 if (error) 1019 goto fail; 1020 } 1021 1022 /* 1023 * Delete old route, if requested. 1024 */ 1025 if (scrub) { 1026 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 1027 in_ifscrub(ifp, ia); 1028 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1029 } 1030 1031 /* 1032 * Calculate netmask/subnetmask. 1033 */ 1034 if (IN_CLASSA(i)) 1035 ia->ia_netmask = IN_CLASSA_NET; 1036 else if (IN_CLASSB(i)) 1037 ia->ia_netmask = IN_CLASSB_NET; 1038 else 1039 ia->ia_netmask = IN_CLASSC_NET; 1040 /* 1041 * The subnet mask usually includes at least the standard network part, 1042 * but may may be smaller in the case of supernetting. 1043 * If it is set, we believe it. 1044 */ 1045 if (ia->ia_subnetmask == 0) { 1046 ia->ia_subnetmask = ia->ia_netmask; 1047 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 1048 } else { 1049 ia->ia_netmask &= ia->ia_subnetmask; 1050 } 1051 ia->ia_net = i & ia->ia_netmask; 1052 ia->ia_subnet = i & ia->ia_subnetmask; 1053 in_socktrim(&ia->ia_sockmask); 1054 1055 /* 1056 * Add route for the network. 1057 */ 1058 ia->ia_ifa.ifa_metric = ifp->if_metric; 1059 if (ifp->if_flags & IFF_BROADCAST) { 1060 ia->ia_broadaddr.sin_addr.s_addr = 1061 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 1062 ia->ia_netbroadcast.s_addr = 1063 htonl(ia->ia_net | ~ ia->ia_netmask); 1064 } else if (ifp->if_flags & IFF_LOOPBACK) { 1065 ia->ia_dstaddr = ia->ia_addr; 1066 flags |= RTF_HOST; 1067 } else if (ifp->if_flags & IFF_POINTOPOINT) { 1068 if (ia->ia_dstaddr.sin_family != AF_INET) 1069 return (0); 1070 flags |= RTF_HOST; 1071 } 1072 1073 /*- 1074 * Don't add host routes for interface addresses of 1075 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it 1076 * possible to assign several such address pairs with consistent 1077 * results (no host route) and is required by BOOTP. 1078 * 1079 * XXX: This is ugly ! There should be a way for the caller to 1080 * say that they don't want a host route. 1081 */ 1082 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY || 1083 ia->ia_netmask != IN_CLASSA_NET || 1084 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) { 1085 error = in_addprefix(ia, flags); 1086 if (error) 1087 goto fail; 1088 } 1089 1090 /* 1091 * If the interface supports multicast, join the "all hosts" 1092 * multicast group on that interface. 1093 */ 1094 if (ifp->if_flags & IFF_MULTICAST) { 1095 struct in_addr addr; 1096 1097 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 1098 in_addmulti(&addr, ifp); 1099 } 1100 return (0); 1101 fail: 1102 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) 1103 in_iahash_remove(ia); 1104 1105 ia->ia_addr = oldaddr; 1106 if (was_hash) 1107 in_iahash_insert(ia); 1108 return (error); 1109 } 1110 1111 #define rtinitflags(x) \ 1112 (((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) \ 1113 ? RTF_HOST : 0) 1114 1115 /* 1116 * Add a route to prefix ("connected route" in cisco terminology). 1117 * Do nothing, if there are some interface addresses with the same 1118 * prefix already. This function assumes that the 'target' parent 1119 * interface is UP. 1120 */ 1121 static int 1122 in_addprefix(struct in_ifaddr *target, int flags) 1123 { 1124 struct in_ifaddr_container *iac; 1125 struct in_addr prefix, mask; 1126 int error; 1127 1128 #ifdef CARP 1129 /* 1130 * Don't add prefix routes for CARP interfaces. 1131 * Prefix routes creation is handled by CARP 1132 * interfaces themselves. 1133 */ 1134 if (target->ia_ifp->if_type == IFT_CARP) 1135 return 0; 1136 #endif 1137 1138 mask = target->ia_sockmask.sin_addr; 1139 if (flags & RTF_HOST) { 1140 prefix = target->ia_dstaddr.sin_addr; 1141 } else { 1142 prefix = target->ia_addr.sin_addr; 1143 prefix.s_addr &= mask.s_addr; 1144 } 1145 1146 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 1147 struct in_ifaddr *ia = iac->ia; 1148 struct in_addr p; 1149 1150 /* Don't test against self */ 1151 if (ia == target) 1152 continue; 1153 1154 /* The tested address does not own a route entry */ 1155 if ((ia->ia_flags & IFA_ROUTE) == 0) 1156 continue; 1157 1158 /* Prefix test */ 1159 if (rtinitflags(ia)) { 1160 p = ia->ia_dstaddr.sin_addr; 1161 } else { 1162 p = ia->ia_addr.sin_addr; 1163 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1164 } 1165 if (prefix.s_addr != p.s_addr) 1166 continue; 1167 1168 /* 1169 * If the to-be-added address and the curretly being 1170 * tested address are not host addresses, we need to 1171 * take subnetmask into consideration. 1172 */ 1173 if (!(flags & RTF_HOST) && !rtinitflags(ia) && 1174 mask.s_addr != ia->ia_sockmask.sin_addr.s_addr) 1175 continue; 1176 1177 /* 1178 * If we got a matching prefix route inserted by other 1179 * interface address, we don't need to bother. 1180 */ 1181 return 0; 1182 } 1183 1184 /* 1185 * No one seem to have prefix route; insert it. 1186 */ 1187 error = rtinit(&target->ia_ifa, RTM_ADD, flags); 1188 if (!error) 1189 target->ia_flags |= IFA_ROUTE; 1190 return error; 1191 } 1192 1193 /* 1194 * Remove a route to prefix ("connected route" in cisco terminology). 1195 * Re-installs the route by using another interface address, if there's 1196 * one with the same prefix (otherwise we lose the route mistakenly). 1197 */ 1198 static void 1199 in_scrubprefix(struct in_ifaddr *target) 1200 { 1201 struct in_ifaddr_container *iac; 1202 struct in_addr prefix, mask; 1203 int error; 1204 1205 if ((target->ia_flags & IFA_ROUTE) == 0) 1206 return; 1207 1208 mask = target->ia_sockmask.sin_addr; 1209 if (rtinitflags(target)) { 1210 prefix = target->ia_dstaddr.sin_addr; 1211 } else { 1212 prefix = target->ia_addr.sin_addr; 1213 prefix.s_addr &= mask.s_addr; 1214 } 1215 1216 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 1217 struct in_ifaddr *ia = iac->ia; 1218 struct in_addr p; 1219 1220 /* Don't test against self */ 1221 if (ia == target) 1222 continue; 1223 1224 /* The tested address already owns a route entry */ 1225 if (ia->ia_flags & IFA_ROUTE) 1226 continue; 1227 1228 /* 1229 * The prefix route of the tested address should 1230 * never be installed if its parent interface is 1231 * not UP yet. 1232 */ 1233 if ((ia->ia_ifp->if_flags & IFF_UP) == 0) 1234 continue; 1235 1236 #ifdef CARP 1237 /* 1238 * Don't add prefix routes for CARP interfaces. 1239 * Prefix routes creation is handled by CARP 1240 * interfaces themselves. 1241 */ 1242 if (ia->ia_ifp->if_type == IFT_CARP) 1243 continue; 1244 #endif 1245 1246 /* Prefix test */ 1247 if (rtinitflags(ia)) { 1248 p = ia->ia_dstaddr.sin_addr; 1249 } else { 1250 p = ia->ia_addr.sin_addr; 1251 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1252 } 1253 if (prefix.s_addr != p.s_addr) 1254 continue; 1255 1256 /* 1257 * We don't need to test subnetmask here, as what we do 1258 * in in_addprefix(), since if the the tested address's 1259 * parent interface is UP, the tested address should own 1260 * a prefix route entry and we would never reach here. 1261 */ 1262 1263 /* 1264 * If we got a matching prefix route, move IFA_ROUTE to him 1265 */ 1266 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target)); 1267 target->ia_flags &= ~IFA_ROUTE; 1268 1269 error = rtinit(&ia->ia_ifa, RTM_ADD, rtinitflags(ia) | RTF_UP); 1270 if (!error) 1271 ia->ia_flags |= IFA_ROUTE; 1272 return; 1273 } 1274 1275 /* 1276 * No candidates for this prefix route; just remove it. 1277 */ 1278 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target)); 1279 target->ia_flags &= ~IFA_ROUTE; 1280 } 1281 1282 #undef rtinitflags 1283 1284 /* 1285 * Return 1 if the address might be a local broadcast address. 1286 */ 1287 int 1288 in_broadcast(struct in_addr in, struct ifnet *ifp) 1289 { 1290 struct ifaddr_container *ifac; 1291 u_long t; 1292 1293 if (in.s_addr == INADDR_BROADCAST || 1294 in.s_addr == INADDR_ANY) 1295 return 1; 1296 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1297 return 0; 1298 t = ntohl(in.s_addr); 1299 /* 1300 * Look through the list of addresses for a match 1301 * with a broadcast address. 1302 */ 1303 #define ia ((struct in_ifaddr *)ifa) 1304 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1305 struct ifaddr *ifa = ifac->ifa; 1306 1307 if (ifa->ifa_addr->sa_family == AF_INET && 1308 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1309 in.s_addr == ia->ia_netbroadcast.s_addr || 1310 /* 1311 * Check for old-style (host 0) broadcast. 1312 */ 1313 t == ia->ia_subnet || t == ia->ia_net) && 1314 /* 1315 * Check for an all one subnetmask. These 1316 * only exist when an interface gets a secondary 1317 * address. 1318 */ 1319 ia->ia_subnetmask != (u_long)0xffffffff) 1320 return 1; 1321 } 1322 return (0); 1323 #undef ia 1324 } 1325 /* 1326 * Add an address to the list of IP multicast addresses for a given interface. 1327 */ 1328 struct in_multi * 1329 in_addmulti(struct in_addr *ap, struct ifnet *ifp) 1330 { 1331 struct in_multi *inm; 1332 int error; 1333 struct sockaddr_in sin; 1334 struct ifmultiaddr *ifma; 1335 1336 /* 1337 * Call generic routine to add membership or increment 1338 * refcount. It wants addresses in the form of a sockaddr, 1339 * so we build one here (being careful to zero the unused bytes). 1340 */ 1341 bzero(&sin, sizeof sin); 1342 sin.sin_family = AF_INET; 1343 sin.sin_len = sizeof sin; 1344 sin.sin_addr = *ap; 1345 crit_enter(); 1346 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 1347 if (error) { 1348 crit_exit(); 1349 return 0; 1350 } 1351 1352 /* 1353 * If ifma->ifma_protospec is null, then if_addmulti() created 1354 * a new record. Otherwise, we are done. 1355 */ 1356 if (ifma->ifma_protospec != 0) { 1357 crit_exit(); 1358 return ifma->ifma_protospec; 1359 } 1360 1361 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 1362 at interrupt time? If so, need to fix if_addmulti. XXX */ 1363 inm = kmalloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO); 1364 inm->inm_addr = *ap; 1365 inm->inm_ifp = ifp; 1366 inm->inm_ifma = ifma; 1367 ifma->ifma_protospec = inm; 1368 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 1369 1370 /* 1371 * Let IGMP know that we have joined a new IP multicast group. 1372 */ 1373 igmp_joingroup(inm); 1374 crit_exit(); 1375 return (inm); 1376 } 1377 1378 /* 1379 * Delete a multicast address record. 1380 */ 1381 void 1382 in_delmulti(struct in_multi *inm) 1383 { 1384 struct ifmultiaddr *ifma; 1385 struct in_multi my_inm; 1386 1387 crit_enter(); 1388 ifma = inm->inm_ifma; 1389 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 1390 if (ifma->ifma_refcount == 1) { 1391 /* 1392 * No remaining claims to this record; let IGMP know that 1393 * we are leaving the multicast group. 1394 * But do it after the if_delmulti() which might reset 1395 * the interface and nuke the packet. 1396 */ 1397 my_inm = *inm ; 1398 ifma->ifma_protospec = 0; 1399 LIST_REMOVE(inm, inm_link); 1400 kfree(inm, M_IPMADDR); 1401 } 1402 /* XXX - should be separate API for when we have an ifma? */ 1403 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1404 if (my_inm.inm_ifp != NULL) 1405 igmp_leavegroup(&my_inm); 1406 crit_exit(); 1407 } 1408 1409 void 1410 in_ifdetach(struct ifnet *ifp) 1411 { 1412 in_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp); 1413 1414 udbinfo_lock(); 1415 in_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp); 1416 udbinfo_unlock(); 1417 } 1418