Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netinet/in.c
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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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)in.c 8.4 (Berkeley) 1/9/95 30 * $FreeBSD: src/sys/netinet/in.c,v 1.44.2.14 2002/11/08 00:45:50 suz Exp $ 31 */ 32 33 #include "opt_bootp.h" 34 #include "opt_carp.h" 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/sockio.h> 39 #include <sys/malloc.h> 40 #include <sys/proc.h> 41 #include <sys/priv.h> 42 #include <sys/msgport.h> 43 #include <sys/socket.h> 44 45 #include <sys/kernel.h> 46 #include <sys/sysctl.h> 47 #include <sys/thread2.h> 48 49 #include <net/if.h> 50 #include <net/if_types.h> 51 #include <net/route.h> 52 #include <net/netmsg2.h> 53 #include <net/netisr2.h> 54 55 #include <netinet/in.h> 56 #include <netinet/in_var.h> 57 #include <netinet/in_pcb.h> 58 #include <netinet/udp_var.h> 59 60 #include <netinet/igmp_var.h> 61 62 MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address"); 63 64 static int in_mask2len (struct in_addr *); 65 static void in_len2mask (struct in_addr *, int); 66 static int in_lifaddr_ioctl (struct socket *, u_long, caddr_t, 67 struct ifnet *, struct thread *); 68 69 static void in_socktrim (struct sockaddr_in *); 70 static int in_ifinit(struct ifnet *, struct in_ifaddr *, 71 const struct sockaddr_in *, int); 72 73 static int in_control_internal(u_long, caddr_t, struct ifnet *, 74 struct thread *); 75 static int in_control_redispatch(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 90 /* 91 * Return 1 if an internet address is for a ``local'' host 92 * (one to which we have a connection). If subnetsarelocal 93 * is true, this includes other subnets of the local net. 94 * Otherwise, it includes only the directly-connected (sub)nets. 95 */ 96 int 97 in_localaddr(struct in_addr in) 98 { 99 u_long i = ntohl(in.s_addr); 100 struct in_ifaddr_container *iac; 101 struct in_ifaddr *ia; 102 103 if (subnetsarelocal) { 104 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 105 ia = iac->ia; 106 107 if ((i & ia->ia_netmask) == ia->ia_net) 108 return (1); 109 } 110 } else { 111 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 112 ia = iac->ia; 113 114 if ((i & ia->ia_subnetmask) == ia->ia_subnet) 115 return (1); 116 } 117 } 118 return (0); 119 } 120 121 /* 122 * Determine whether an IP address is in a reserved set of addresses 123 * that may not be forwarded, or whether datagrams to that destination 124 * may be forwarded. 125 */ 126 int 127 in_canforward(struct in_addr in) 128 { 129 u_long i = ntohl(in.s_addr); 130 u_long net; 131 132 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) 133 return (0); 134 if (IN_CLASSA(i)) { 135 net = i & IN_CLASSA_NET; 136 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 137 return (0); 138 } 139 return (1); 140 } 141 142 /* 143 * Trim a mask in a sockaddr 144 */ 145 static void 146 in_socktrim(struct sockaddr_in *ap) 147 { 148 char *cplim = (char *) &ap->sin_addr; 149 char *cp = (char *) (&ap->sin_addr + 1); 150 151 ap->sin_len = 0; 152 while (--cp >= cplim) 153 if (*cp) { 154 (ap)->sin_len = cp - (char *) (ap) + 1; 155 break; 156 } 157 } 158 159 static int 160 in_mask2len(struct in_addr *mask) 161 { 162 int x, y; 163 u_char *p; 164 165 p = (u_char *)mask; 166 for (x = 0; x < sizeof *mask; x++) { 167 if (p[x] != 0xff) 168 break; 169 } 170 y = 0; 171 if (x < sizeof *mask) { 172 for (y = 0; y < 8; y++) { 173 if ((p[x] & (0x80 >> y)) == 0) 174 break; 175 } 176 } 177 return x * 8 + y; 178 } 179 180 static void 181 in_len2mask(struct in_addr *mask, int len) 182 { 183 int i; 184 u_char *p; 185 186 p = (u_char *)mask; 187 bzero(mask, sizeof *mask); 188 for (i = 0; i < len / 8; i++) 189 p[i] = 0xff; 190 if (len % 8) 191 p[i] = (0xff00 >> (len % 8)) & 0xff; 192 } 193 194 static int in_interfaces; /* number of external internet interfaces */ 195 196 void 197 in_control_dispatch(netmsg_t msg) 198 { 199 int error; 200 201 error = in_control_redispatch(msg->control.nm_cmd, 202 msg->control.nm_data, 203 msg->control.nm_ifp, 204 msg->control.nm_td); 205 lwkt_replymsg(&msg->lmsg, error); 206 } 207 208 static void 209 in_control_internal_dispatch(netmsg_t msg) 210 { 211 int error; 212 213 error = in_control_internal(msg->control.nm_cmd, 214 msg->control.nm_data, 215 msg->control.nm_ifp, 216 msg->control.nm_td); 217 lwkt_replymsg(&msg->lmsg, error); 218 } 219 220 static int 221 in_control_redispatch(u_long cmd, caddr_t data, struct ifnet *ifp, 222 struct thread *td) 223 { 224 struct netmsg_pru_control msg; 225 int error; 226 227 /* 228 * IFADDR alterations are serialized by netisr0 229 */ 230 switch (cmd) { 231 case SIOCSIFDSTADDR: 232 case SIOCSIFBRDADDR: 233 case SIOCSIFADDR: 234 case SIOCSIFNETMASK: 235 case SIOCAIFADDR: 236 case SIOCDIFADDR: 237 netmsg_init(&msg.base, NULL, &curthread->td_msgport, 238 0, in_control_internal_dispatch); 239 msg.nm_cmd = cmd; 240 msg.nm_data = data; 241 msg.nm_ifp = ifp; 242 msg.nm_td = td; 243 lwkt_domsg(netisr_cpuport(0), &msg.base.lmsg, 0); 244 error = msg.base.lmsg.ms_error; 245 break; 246 247 default: 248 error = in_control_internal(cmd, data, ifp, td); 249 break; 250 } 251 return error; 252 } 253 254 /* 255 * Generic internet control operations (ioctl's). 256 * Ifp is 0 if not an interface-specific ioctl. 257 * 258 * NOTE! td might be NULL. 259 */ 260 /* ARGSUSED */ 261 int 262 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 263 struct thread *td) 264 { 265 int error; 266 267 switch (cmd) { 268 case SIOCALIFADDR: 269 case SIOCDLIFADDR: 270 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 271 return error; 272 /* FALLTHROUGH */ 273 case SIOCGLIFADDR: 274 if (!ifp) 275 return EINVAL; 276 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 277 } 278 279 KASSERT(cmd != SIOCALIFADDR && cmd != SIOCDLIFADDR, 280 ("recursive SIOC%cLIFADDR!", 281 cmd == SIOCDLIFADDR ? 'D' : 'A')); 282 283 return in_control_redispatch(cmd, data, ifp, td); 284 } 285 286 static void 287 in_ialink_dispatch(netmsg_t msg) 288 { 289 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 290 struct ifaddr_container *ifac; 291 struct in_ifaddr_container *iac; 292 int cpu = mycpuid; 293 294 crit_enter(); 295 296 ifac = &ia->ia_ifa.ifa_containers[cpu]; 297 ASSERT_IFAC_VALID(ifac); 298 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD) == 0, 299 ("ia is on in_ifaddrheads")); 300 301 ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHEAD; 302 iac = &ifac->ifa_proto_u.u_in_ifac; 303 TAILQ_INSERT_TAIL(&in_ifaddrheads[cpu], iac, ia_link); 304 305 crit_exit(); 306 307 ifa_forwardmsg(&msg->lmsg, cpu + 1); 308 } 309 310 static void 311 in_iaunlink_dispatch(netmsg_t msg) 312 { 313 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 314 struct ifaddr_container *ifac; 315 struct in_ifaddr_container *iac; 316 int cpu = mycpuid; 317 318 crit_enter(); 319 320 ifac = &ia->ia_ifa.ifa_containers[cpu]; 321 ASSERT_IFAC_VALID(ifac); 322 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD, 323 ("ia is not on in_ifaddrheads")); 324 325 iac = &ifac->ifa_proto_u.u_in_ifac; 326 TAILQ_REMOVE(&in_ifaddrheads[cpu], iac, ia_link); 327 ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHEAD; 328 329 crit_exit(); 330 331 ifa_forwardmsg(&msg->lmsg, cpu + 1); 332 } 333 334 static void 335 in_iahashins_dispatch(netmsg_t msg) 336 { 337 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 338 struct ifaddr_container *ifac; 339 struct in_ifaddr_container *iac; 340 int cpu = mycpuid; 341 342 crit_enter(); 343 344 ifac = &ia->ia_ifa.ifa_containers[cpu]; 345 ASSERT_IFAC_VALID(ifac); 346 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0, 347 ("ia is on in_ifaddrhashtbls")); 348 349 ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHASH; 350 iac = &ifac->ifa_proto_u.u_in_ifac; 351 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 352 iac, ia_hash); 353 354 crit_exit(); 355 356 ifa_forwardmsg(&msg->lmsg, cpu + 1); 357 } 358 359 static void 360 in_iahashrem_dispatch(netmsg_t msg) 361 { 362 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 363 struct ifaddr_container *ifac; 364 struct in_ifaddr_container *iac; 365 int cpu = mycpuid; 366 367 crit_enter(); 368 369 ifac = &ia->ia_ifa.ifa_containers[cpu]; 370 ASSERT_IFAC_VALID(ifac); 371 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH, 372 ("ia is not on in_ifaddrhashtbls")); 373 374 iac = &ifac->ifa_proto_u.u_in_ifac; 375 LIST_REMOVE(iac, ia_hash); 376 ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHASH; 377 378 crit_exit(); 379 380 ifa_forwardmsg(&msg->lmsg, cpu + 1); 381 } 382 383 static void 384 in_ialink(struct in_ifaddr *ia) 385 { 386 struct netmsg_base msg; 387 388 netmsg_init(&msg, NULL, &curthread->td_msgport, 389 0, in_ialink_dispatch); 390 msg.lmsg.u.ms_resultp = ia; 391 392 ifa_domsg(&msg.lmsg, 0); 393 } 394 395 void 396 in_iaunlink(struct in_ifaddr *ia) 397 { 398 struct netmsg_base msg; 399 400 netmsg_init(&msg, NULL, &curthread->td_msgport, 401 0, in_iaunlink_dispatch); 402 msg.lmsg.u.ms_resultp = ia; 403 404 ifa_domsg(&msg.lmsg, 0); 405 } 406 407 void 408 in_iahash_insert(struct in_ifaddr *ia) 409 { 410 struct netmsg_base msg; 411 412 netmsg_init(&msg, NULL, &curthread->td_msgport, 413 0, in_iahashins_dispatch); 414 msg.lmsg.u.ms_resultp = ia; 415 416 ifa_domsg(&msg.lmsg, 0); 417 } 418 419 void 420 in_iahash_remove(struct in_ifaddr *ia) 421 { 422 struct netmsg_base msg; 423 424 netmsg_init(&msg, NULL, &curthread->td_msgport, 425 0, in_iahashrem_dispatch); 426 msg.lmsg.u.ms_resultp = ia; 427 428 ifa_domsg(&msg.lmsg, 0); 429 } 430 431 static __inline struct in_ifaddr * 432 in_ianext(struct in_ifaddr *oia) 433 { 434 struct ifaddr_container *ifac; 435 struct in_ifaddr_container *iac; 436 437 ifac = &oia->ia_ifa.ifa_containers[mycpuid]; 438 ASSERT_IFAC_VALID(ifac); 439 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD, 440 ("ia is not on in_ifaddrheads")); 441 442 iac = &ifac->ifa_proto_u.u_in_ifac; 443 iac = TAILQ_NEXT(iac, ia_link); 444 if (iac != NULL) 445 return iac->ia; 446 else 447 return NULL; 448 } 449 450 static int 451 in_control_internal(u_long cmd, caddr_t data, struct ifnet *ifp, 452 struct thread *td) 453 { 454 struct ifreq *ifr = (struct ifreq *)data; 455 struct in_ifaddr *ia = NULL; 456 struct in_addr dst; 457 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 458 struct ifaddr_container *ifac; 459 struct in_ifaddr_container *iac; 460 struct sockaddr_in oldaddr; 461 int hostIsNew, iaIsNew, maskIsNew, ifpWasUp; 462 int error = 0; 463 464 iaIsNew = 0; 465 ifpWasUp = 0; 466 467 /* 468 * Find address for this interface, if it exists. 469 * 470 * If an alias address was specified, find that one instead of 471 * the first one on the interface, if possible 472 */ 473 if (ifp) { 474 struct in_ifaddr *iap; 475 476 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 477 LIST_FOREACH(iac, INADDR_HASH(dst.s_addr), ia_hash) { 478 iap = iac->ia; 479 if (iap->ia_ifp == ifp && 480 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 481 ia = iap; 482 break; 483 } 484 } 485 if (ia == NULL) { 486 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], 487 ifa_link) { 488 iap = ifatoia(ifac->ifa); 489 if (iap->ia_addr.sin_family == AF_INET) { 490 ia = iap; 491 break; 492 } 493 } 494 } 495 496 if (ifp->if_flags & IFF_UP) 497 ifpWasUp = 1; 498 } 499 500 switch (cmd) { 501 case SIOCAIFADDR: 502 case SIOCDIFADDR: 503 if (ifp == NULL) 504 return (EADDRNOTAVAIL); 505 if (ifra->ifra_addr.sin_family == AF_INET) { 506 while (ia != NULL) { 507 if (ia->ia_ifp == ifp && 508 ia->ia_addr.sin_addr.s_addr == 509 ifra->ifra_addr.sin_addr.s_addr) 510 break; 511 ia = in_ianext(ia); 512 } 513 if ((ifp->if_flags & IFF_POINTOPOINT) && 514 cmd == SIOCAIFADDR && 515 ifra->ifra_dstaddr.sin_addr.s_addr == INADDR_ANY) { 516 return EDESTADDRREQ; 517 } 518 } 519 if (cmd == SIOCDIFADDR && ia == NULL) 520 return (EADDRNOTAVAIL); 521 /* FALLTHROUGH */ 522 case SIOCSIFADDR: 523 case SIOCSIFNETMASK: 524 case SIOCSIFDSTADDR: 525 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 526 return error; 527 528 if (ifp == NULL) 529 return (EADDRNOTAVAIL); 530 531 if (cmd == SIOCSIFDSTADDR && 532 (ifp->if_flags & IFF_POINTOPOINT) == 0) 533 return (EINVAL); 534 535 if (ia == NULL) { 536 struct ifaddr *ifa; 537 int i; 538 539 ia = ifa_create(sizeof(*ia), M_WAITOK); 540 ifa = &ia->ia_ifa; 541 542 /* 543 * Setup per-CPU information 544 */ 545 for (i = 0; i < ncpus; ++i) { 546 ifac = &ifa->ifa_containers[i]; 547 iac = &ifac->ifa_proto_u.u_in_ifac; 548 iac->ia = ia; 549 iac->ia_ifac = ifac; 550 } 551 552 /* 553 * Protect from NETISR_IP traversing address list 554 * while we're modifying it. 555 */ 556 crit_enter(); 557 558 in_ialink(ia); 559 ifa_iflink(ifa, ifp, 1); 560 561 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 562 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 563 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 564 ia->ia_sockmask.sin_len = 8; 565 ia->ia_sockmask.sin_family = AF_INET; 566 if (ifp->if_flags & IFF_BROADCAST) { 567 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr; 568 ia->ia_broadaddr.sin_family = AF_INET; 569 } 570 ia->ia_ifp = ifp; 571 if (!(ifp->if_flags & IFF_LOOPBACK)) 572 in_interfaces++; 573 iaIsNew = 1; 574 575 crit_exit(); 576 } 577 break; 578 579 case SIOCSIFBRDADDR: 580 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 581 return error; 582 /* FALLTHROUGH */ 583 584 case SIOCGIFADDR: 585 case SIOCGIFNETMASK: 586 case SIOCGIFDSTADDR: 587 case SIOCGIFBRDADDR: 588 if (ia == NULL) 589 return (EADDRNOTAVAIL); 590 break; 591 } 592 593 switch (cmd) { 594 case SIOCGIFADDR: 595 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 596 return (0); 597 598 case SIOCGIFBRDADDR: 599 if ((ifp->if_flags & IFF_BROADCAST) == 0) 600 return (EINVAL); 601 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 602 return (0); 603 604 case SIOCGIFDSTADDR: 605 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 606 return (EINVAL); 607 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 608 return (0); 609 610 case SIOCGIFNETMASK: 611 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 612 return (0); 613 614 case SIOCSIFDSTADDR: 615 KKASSERT(ifp->if_flags & IFF_POINTOPOINT); 616 617 oldaddr = ia->ia_dstaddr; 618 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 619 if (ifp->if_ioctl != NULL) { 620 ifnet_serialize_all(ifp); 621 error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia, 622 td->td_proc->p_ucred); 623 ifnet_deserialize_all(ifp); 624 if (error) { 625 ia->ia_dstaddr = oldaddr; 626 return (error); 627 } 628 } 629 if (ia->ia_flags & IFA_ROUTE) { 630 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 631 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 632 ia->ia_ifa.ifa_dstaddr = 633 (struct sockaddr *)&ia->ia_dstaddr; 634 rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP); 635 } 636 return (0); 637 638 case SIOCSIFBRDADDR: 639 if ((ifp->if_flags & IFF_BROADCAST) == 0) 640 return (EINVAL); 641 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 642 return (0); 643 644 case SIOCSIFADDR: 645 error = in_ifinit(ifp, ia, 646 (const struct sockaddr_in *)&ifr->ifr_addr, 1); 647 if (error != 0 && iaIsNew) 648 break; 649 if (error == 0) { 650 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 651 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 652 &ia->ia_ifa); 653 } 654 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) { 655 /* 656 * Interface is brought up by in_ifinit() 657 * (via ifp->if_ioctl). We act as if the 658 * interface got IFF_UP flag turned on. 659 */ 660 if_up(ifp); 661 } 662 return (0); 663 664 case SIOCSIFNETMASK: 665 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 666 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 667 return (0); 668 669 case SIOCAIFADDR: 670 maskIsNew = 0; 671 hostIsNew = 1; 672 error = 0; 673 if (ia->ia_addr.sin_family == AF_INET) { 674 if (ifra->ifra_addr.sin_len == 0) { 675 ifra->ifra_addr = ia->ia_addr; 676 hostIsNew = 0; 677 } else if (ifra->ifra_addr.sin_addr.s_addr == 678 ia->ia_addr.sin_addr.s_addr) { 679 hostIsNew = 0; 680 } 681 } 682 if (ifra->ifra_mask.sin_len) { 683 in_ifscrub(ifp, ia); 684 ia->ia_sockmask = ifra->ifra_mask; 685 ia->ia_sockmask.sin_family = AF_INET; 686 ia->ia_subnetmask = 687 ntohl(ia->ia_sockmask.sin_addr.s_addr); 688 maskIsNew = 1; 689 } 690 if ((ifp->if_flags & IFF_POINTOPOINT) && 691 ifra->ifra_dstaddr.sin_family == AF_INET) { 692 in_ifscrub(ifp, ia); 693 ia->ia_dstaddr = ifra->ifra_dstaddr; 694 maskIsNew = 1; /* We lie; but the effect's the same */ 695 } 696 if (ifra->ifra_addr.sin_family == AF_INET && 697 (hostIsNew || maskIsNew)) 698 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 699 700 if (error != 0 && iaIsNew) 701 break; 702 703 if ((ifp->if_flags & IFF_BROADCAST) && 704 ifra->ifra_broadaddr.sin_family == AF_INET) 705 ia->ia_broadaddr = ifra->ifra_broadaddr; 706 if (error == 0) { 707 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 708 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 709 &ia->ia_ifa); 710 } 711 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) { 712 /* See the comment in SIOCSIFADDR */ 713 if_up(ifp); 714 } 715 return (error); 716 717 case SIOCDIFADDR: 718 /* 719 * in_ifscrub kills the interface route. 720 */ 721 in_ifscrub(ifp, ia); 722 /* 723 * in_ifadown gets rid of all the rest of 724 * the routes. This is not quite the right 725 * thing to do, but at least if we are running 726 * a routing process they will come back. 727 */ 728 in_ifadown(&ia->ia_ifa, 1); 729 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE, 730 &ia->ia_ifa); 731 error = 0; 732 break; 733 734 default: 735 if (ifp == NULL || ifp->if_ioctl == NULL) 736 return (EOPNOTSUPP); 737 ifnet_serialize_all(ifp); 738 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred); 739 ifnet_deserialize_all(ifp); 740 return (error); 741 } 742 743 KKASSERT(cmd == SIOCDIFADDR || 744 ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && iaIsNew)); 745 746 ifa_ifunlink(&ia->ia_ifa, ifp); 747 in_iaunlink(ia); 748 749 if (cmd == SIOCDIFADDR) { 750 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 751 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) 752 in_iahash_remove(ia); 753 } 754 #ifdef INVARIANTS 755 else { 756 /* 757 * If cmd is SIOCSIFADDR or SIOCAIFADDR, in_ifinit() has 758 * already taken care of the deletion from hash table 759 */ 760 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 761 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0, 762 ("SIOC%cIFADDR failed on new ia, " 763 "but the new ia is still in hash table", 764 cmd == SIOCSIFADDR ? 'S' : 'A')); 765 } 766 #endif 767 768 ifa_destroy(&ia->ia_ifa); 769 770 if ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && 771 !ifpWasUp && (ifp->if_flags & IFF_UP)) { 772 /* 773 * Though the address assignment failed, the 774 * interface is brought up by in_ifinit() 775 * (via ifp->if_ioctl). With the hope that 776 * the interface has some valid addresses, we 777 * act as if IFF_UP flag was just set on the 778 * interface. 779 * 780 * NOTE: 781 * This could only be done after the failed 782 * address is unlinked from the global address 783 * list. 784 */ 785 if_up(ifp); 786 } 787 788 return (error); 789 } 790 791 /* 792 * SIOC[GAD]LIFADDR. 793 * SIOCGLIFADDR: get first address. (?!?) 794 * SIOCGLIFADDR with IFLR_PREFIX: 795 * get first address that matches the specified prefix. 796 * SIOCALIFADDR: add the specified address. 797 * SIOCALIFADDR with IFLR_PREFIX: 798 * EINVAL since we can't deduce hostid part of the address. 799 * SIOCDLIFADDR: delete the specified address. 800 * SIOCDLIFADDR with IFLR_PREFIX: 801 * delete the first address that matches the specified prefix. 802 * return values: 803 * EINVAL on invalid parameters 804 * EADDRNOTAVAIL on prefix match failed/specified address not found 805 * other values may be returned from in_ioctl() 806 * 807 * NOTE! td might be NULL. 808 */ 809 static int 810 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 811 struct thread *td) 812 { 813 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 814 815 /* sanity checks */ 816 if (!data || !ifp) { 817 panic("invalid argument to in_lifaddr_ioctl"); 818 /*NOTRECHED*/ 819 } 820 821 switch (cmd) { 822 case SIOCGLIFADDR: 823 /* address must be specified on GET with IFLR_PREFIX */ 824 if ((iflr->flags & IFLR_PREFIX) == 0) 825 break; 826 /*FALLTHROUGH*/ 827 case SIOCALIFADDR: 828 case SIOCDLIFADDR: 829 /* address must be specified on ADD and DELETE */ 830 if (iflr->addr.ss_family != AF_INET) 831 return EINVAL; 832 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 833 return EINVAL; 834 /* XXX need improvement */ 835 if (iflr->dstaddr.ss_family 836 && iflr->dstaddr.ss_family != AF_INET) 837 return EINVAL; 838 if (iflr->dstaddr.ss_family 839 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 840 return EINVAL; 841 break; 842 default: /*shouldn't happen*/ 843 return EOPNOTSUPP; 844 } 845 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 846 return EINVAL; 847 848 switch (cmd) { 849 case SIOCALIFADDR: 850 { 851 struct in_aliasreq ifra; 852 853 if (iflr->flags & IFLR_PREFIX) 854 return EINVAL; 855 856 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 857 bzero(&ifra, sizeof ifra); 858 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name); 859 860 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 861 862 if (iflr->dstaddr.ss_family) { /*XXX*/ 863 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 864 iflr->dstaddr.ss_len); 865 } 866 867 ifra.ifra_mask.sin_family = AF_INET; 868 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 869 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 870 871 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 872 } 873 case SIOCGLIFADDR: 874 case SIOCDLIFADDR: 875 { 876 struct ifaddr_container *ifac; 877 struct in_ifaddr *ia; 878 struct in_addr mask, candidate, match; 879 struct sockaddr_in *sin; 880 int cmp; 881 882 bzero(&mask, sizeof mask); 883 if (iflr->flags & IFLR_PREFIX) { 884 /* lookup a prefix rather than address. */ 885 in_len2mask(&mask, iflr->prefixlen); 886 887 sin = (struct sockaddr_in *)&iflr->addr; 888 match.s_addr = sin->sin_addr.s_addr; 889 match.s_addr &= mask.s_addr; 890 891 /* if you set extra bits, that's wrong */ 892 if (match.s_addr != sin->sin_addr.s_addr) 893 return EINVAL; 894 895 cmp = 1; 896 } else { 897 if (cmd == SIOCGLIFADDR) { 898 /* on getting an address, take the 1st match */ 899 match.s_addr = 0; /* gcc4 warning */ 900 cmp = 0; /*XXX*/ 901 } else { 902 /* on deleting an address, do exact match */ 903 in_len2mask(&mask, 32); 904 sin = (struct sockaddr_in *)&iflr->addr; 905 match.s_addr = sin->sin_addr.s_addr; 906 907 cmp = 1; 908 } 909 } 910 911 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 912 struct ifaddr *ifa = ifac->ifa; 913 914 if (ifa->ifa_addr->sa_family != AF_INET6) 915 continue; 916 if (!cmp) 917 break; 918 candidate.s_addr = 919 ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 920 candidate.s_addr &= mask.s_addr; 921 if (candidate.s_addr == match.s_addr) 922 break; 923 } 924 if (ifac == NULL) 925 return EADDRNOTAVAIL; 926 ia = (struct in_ifaddr *)(ifac->ifa); 927 928 if (cmd == SIOCGLIFADDR) { 929 /* fill in the if_laddrreq structure */ 930 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 931 932 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 933 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 934 ia->ia_dstaddr.sin_len); 935 } else 936 bzero(&iflr->dstaddr, sizeof iflr->dstaddr); 937 938 iflr->prefixlen = 939 in_mask2len(&ia->ia_sockmask.sin_addr); 940 941 iflr->flags = 0; /*XXX*/ 942 943 return 0; 944 } else { 945 struct in_aliasreq ifra; 946 947 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 948 bzero(&ifra, sizeof ifra); 949 bcopy(iflr->iflr_name, ifra.ifra_name, 950 sizeof ifra.ifra_name); 951 952 bcopy(&ia->ia_addr, &ifra.ifra_addr, 953 ia->ia_addr.sin_len); 954 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 955 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 956 ia->ia_dstaddr.sin_len); 957 } 958 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 959 ia->ia_sockmask.sin_len); 960 961 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 962 ifp, td); 963 } 964 } 965 } 966 967 return EOPNOTSUPP; /*just for safety*/ 968 } 969 970 /* 971 * Delete any existing route for an interface. 972 */ 973 void 974 in_ifscrub(struct ifnet *ifp __unused, struct in_ifaddr *ia) 975 { 976 in_scrubprefix(ia); 977 } 978 979 /* 980 * Initialize an interface's internet address 981 * and routing table entry. 982 */ 983 static int 984 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, 985 const struct sockaddr_in *sin, int scrub) 986 { 987 u_long i = ntohl(sin->sin_addr.s_addr); 988 struct sockaddr_in oldaddr; 989 struct ifaddr_container *ifac; 990 int flags = RTF_UP, error = 0; 991 int was_hash = 0; 992 993 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 994 oldaddr = ia->ia_addr; 995 996 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) { 997 was_hash = 1; 998 in_iahash_remove(ia); 999 } 1000 1001 ia->ia_addr = *sin; 1002 if (ia->ia_addr.sin_family == AF_INET) 1003 in_iahash_insert(ia); 1004 1005 /* 1006 * Give the interface a chance to initialize 1007 * if this is its first address, 1008 * and to validate the address if necessary. 1009 */ 1010 if (ifp->if_ioctl != NULL) { 1011 ifnet_serialize_all(ifp); 1012 error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL); 1013 ifnet_deserialize_all(ifp); 1014 if (error) 1015 goto fail; 1016 } 1017 1018 /* 1019 * Delete old route, if requested. 1020 */ 1021 if (scrub) { 1022 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 1023 in_ifscrub(ifp, ia); 1024 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1025 } 1026 1027 /* 1028 * Calculate netmask/subnetmask. 1029 */ 1030 if (IN_CLASSA(i)) 1031 ia->ia_netmask = IN_CLASSA_NET; 1032 else if (IN_CLASSB(i)) 1033 ia->ia_netmask = IN_CLASSB_NET; 1034 else 1035 ia->ia_netmask = IN_CLASSC_NET; 1036 /* 1037 * The subnet mask usually includes at least the standard network part, 1038 * but may may be smaller in the case of supernetting. 1039 * If it is set, we believe it. 1040 */ 1041 if (ia->ia_subnetmask == 0) { 1042 ia->ia_subnetmask = ia->ia_netmask; 1043 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 1044 } else { 1045 ia->ia_netmask &= ia->ia_subnetmask; 1046 } 1047 ia->ia_net = i & ia->ia_netmask; 1048 ia->ia_subnet = i & ia->ia_subnetmask; 1049 in_socktrim(&ia->ia_sockmask); 1050 1051 /* 1052 * Add route for the network. 1053 */ 1054 ia->ia_ifa.ifa_metric = ifp->if_metric; 1055 if (ifp->if_flags & IFF_BROADCAST) { 1056 ia->ia_broadaddr.sin_addr.s_addr = 1057 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 1058 ia->ia_netbroadcast.s_addr = 1059 htonl(ia->ia_net | ~ ia->ia_netmask); 1060 } else if (ifp->if_flags & IFF_LOOPBACK) { 1061 ia->ia_dstaddr = ia->ia_addr; 1062 flags |= RTF_HOST; 1063 } else if (ifp->if_flags & IFF_POINTOPOINT) { 1064 if (ia->ia_dstaddr.sin_family != AF_INET) 1065 return (0); 1066 flags |= RTF_HOST; 1067 } 1068 1069 /*- 1070 * Don't add host routes for interface addresses of 1071 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it 1072 * possible to assign several such address pairs with consistent 1073 * results (no host route) and is required by BOOTP. 1074 * 1075 * XXX: This is ugly ! There should be a way for the caller to 1076 * say that they don't want a host route. 1077 */ 1078 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY || 1079 ia->ia_netmask != IN_CLASSA_NET || 1080 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) { 1081 error = in_addprefix(ia, flags); 1082 if (error) 1083 goto fail; 1084 } 1085 1086 /* 1087 * If the interface supports multicast, join the "all hosts" 1088 * multicast group on that interface. 1089 */ 1090 if (ifp->if_flags & IFF_MULTICAST) { 1091 struct in_addr addr; 1092 1093 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 1094 in_addmulti(&addr, ifp); 1095 } 1096 return (0); 1097 fail: 1098 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) 1099 in_iahash_remove(ia); 1100 1101 ia->ia_addr = oldaddr; 1102 if (was_hash) 1103 in_iahash_insert(ia); 1104 return (error); 1105 } 1106 1107 #define rtinitflags(x) \ 1108 (((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) \ 1109 ? RTF_HOST : 0) 1110 1111 /* 1112 * Add a route to prefix ("connected route" in cisco terminology). 1113 * Do nothing, if there are some interface addresses with the same 1114 * prefix already. This function assumes that the 'target' parent 1115 * interface is UP. 1116 */ 1117 static int 1118 in_addprefix(struct in_ifaddr *target, int flags) 1119 { 1120 struct in_ifaddr_container *iac; 1121 struct in_addr prefix, mask; 1122 int error; 1123 1124 #ifdef CARP 1125 /* 1126 * Don't add prefix routes for CARP interfaces. 1127 * Prefix routes creation is handled by CARP 1128 * interfaces themselves. 1129 */ 1130 if (target->ia_ifp->if_type == IFT_CARP) 1131 return 0; 1132 #endif 1133 1134 mask = target->ia_sockmask.sin_addr; 1135 if (flags & RTF_HOST) { 1136 prefix = target->ia_dstaddr.sin_addr; 1137 } else { 1138 prefix = target->ia_addr.sin_addr; 1139 prefix.s_addr &= mask.s_addr; 1140 } 1141 1142 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 1143 struct in_ifaddr *ia = iac->ia; 1144 struct in_addr p; 1145 1146 /* Don't test against self */ 1147 if (ia == target) 1148 continue; 1149 1150 /* The tested address does not own a route entry */ 1151 if ((ia->ia_flags & IFA_ROUTE) == 0) 1152 continue; 1153 1154 /* Prefix test */ 1155 if (rtinitflags(ia)) { 1156 p = ia->ia_dstaddr.sin_addr; 1157 } else { 1158 p = ia->ia_addr.sin_addr; 1159 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1160 } 1161 if (prefix.s_addr != p.s_addr) 1162 continue; 1163 1164 /* 1165 * If the to-be-added address and the curretly being 1166 * tested address are not host addresses, we need to 1167 * take subnetmask into consideration. 1168 */ 1169 if (!(flags & RTF_HOST) && !rtinitflags(ia) && 1170 mask.s_addr != ia->ia_sockmask.sin_addr.s_addr) 1171 continue; 1172 1173 /* 1174 * If we got a matching prefix route inserted by other 1175 * interface address, we don't need to bother. 1176 */ 1177 return 0; 1178 } 1179 1180 /* 1181 * No one seem to have prefix route; insert it. 1182 */ 1183 error = rtinit(&target->ia_ifa, RTM_ADD, flags); 1184 if (!error) 1185 target->ia_flags |= IFA_ROUTE; 1186 return error; 1187 } 1188 1189 /* 1190 * Remove a route to prefix ("connected route" in cisco terminology). 1191 * Re-installs the route by using another interface address, if there's 1192 * one with the same prefix (otherwise we lose the route mistakenly). 1193 */ 1194 static void 1195 in_scrubprefix(struct in_ifaddr *target) 1196 { 1197 struct in_ifaddr_container *iac; 1198 struct in_addr prefix, mask; 1199 int error; 1200 1201 #ifdef CARP 1202 /* 1203 * Don't scrub prefix routes for CARP interfaces. 1204 * Prefix routes deletion is handled by CARP 1205 * interfaces themselves. 1206 */ 1207 if (target->ia_ifp->if_type == IFT_CARP) 1208 return; 1209 #endif 1210 1211 if ((target->ia_flags & IFA_ROUTE) == 0) 1212 return; 1213 1214 mask = target->ia_sockmask.sin_addr; 1215 if (rtinitflags(target)) { 1216 prefix = target->ia_dstaddr.sin_addr; 1217 } else { 1218 prefix = target->ia_addr.sin_addr; 1219 prefix.s_addr &= mask.s_addr; 1220 } 1221 1222 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 1223 struct in_ifaddr *ia = iac->ia; 1224 struct in_addr p; 1225 1226 /* Don't test against self */ 1227 if (ia == target) 1228 continue; 1229 1230 /* The tested address already owns a route entry */ 1231 if (ia->ia_flags & IFA_ROUTE) 1232 continue; 1233 1234 /* 1235 * The prefix route of the tested address should 1236 * never be installed if its parent interface is 1237 * not UP yet. 1238 */ 1239 if ((ia->ia_ifp->if_flags & IFF_UP) == 0) 1240 continue; 1241 1242 #ifdef CARP 1243 /* 1244 * Don't add prefix routes for CARP interfaces. 1245 * Prefix routes creation is handled by CARP 1246 * interfaces themselves. 1247 */ 1248 if (ia->ia_ifp->if_type == IFT_CARP) 1249 continue; 1250 #endif 1251 1252 /* Prefix test */ 1253 if (rtinitflags(ia)) { 1254 p = ia->ia_dstaddr.sin_addr; 1255 } else { 1256 p = ia->ia_addr.sin_addr; 1257 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1258 } 1259 if (prefix.s_addr != p.s_addr) 1260 continue; 1261 1262 /* 1263 * We don't need to test subnetmask here, as what we do 1264 * in in_addprefix(), since if the the tested address's 1265 * parent interface is UP, the tested address should own 1266 * a prefix route entry and we would never reach here. 1267 */ 1268 1269 /* 1270 * If we got a matching prefix route, move IFA_ROUTE to him 1271 */ 1272 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target)); 1273 target->ia_flags &= ~IFA_ROUTE; 1274 1275 error = rtinit(&ia->ia_ifa, RTM_ADD, rtinitflags(ia) | RTF_UP); 1276 if (!error) 1277 ia->ia_flags |= IFA_ROUTE; 1278 return; 1279 } 1280 1281 /* 1282 * No candidates for this prefix route; just remove it. 1283 */ 1284 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target)); 1285 target->ia_flags &= ~IFA_ROUTE; 1286 } 1287 1288 #undef rtinitflags 1289 1290 /* 1291 * Return 1 if the address might be a local broadcast address. 1292 */ 1293 int 1294 in_broadcast(struct in_addr in, struct ifnet *ifp) 1295 { 1296 struct ifaddr_container *ifac; 1297 u_long t; 1298 1299 if (in.s_addr == INADDR_BROADCAST || 1300 in.s_addr == INADDR_ANY) 1301 return 1; 1302 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1303 return 0; 1304 t = ntohl(in.s_addr); 1305 /* 1306 * Look through the list of addresses for a match 1307 * with a broadcast address. 1308 */ 1309 #define ia ((struct in_ifaddr *)ifa) 1310 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1311 struct ifaddr *ifa = ifac->ifa; 1312 1313 if (ifa->ifa_addr->sa_family == AF_INET && 1314 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1315 in.s_addr == ia->ia_netbroadcast.s_addr || 1316 /* 1317 * Check for old-style (host 0) broadcast. 1318 */ 1319 t == ia->ia_subnet || t == ia->ia_net) && 1320 /* 1321 * Check for an all one subnetmask. These 1322 * only exist when an interface gets a secondary 1323 * address. 1324 */ 1325 ia->ia_subnetmask != (u_long)0xffffffff) 1326 return 1; 1327 } 1328 return (0); 1329 #undef ia 1330 } 1331 /* 1332 * Add an address to the list of IP multicast addresses for a given interface. 1333 */ 1334 struct in_multi * 1335 in_addmulti(struct in_addr *ap, struct ifnet *ifp) 1336 { 1337 struct in_multi *inm; 1338 int error; 1339 struct sockaddr_in sin; 1340 struct ifmultiaddr *ifma; 1341 1342 /* 1343 * Call generic routine to add membership or increment 1344 * refcount. It wants addresses in the form of a sockaddr, 1345 * so we build one here (being careful to zero the unused bytes). 1346 */ 1347 bzero(&sin, sizeof sin); 1348 sin.sin_family = AF_INET; 1349 sin.sin_len = sizeof sin; 1350 sin.sin_addr = *ap; 1351 crit_enter(); 1352 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 1353 if (error) { 1354 crit_exit(); 1355 return 0; 1356 } 1357 1358 /* 1359 * If ifma->ifma_protospec is null, then if_addmulti() created 1360 * a new record. Otherwise, we are done. 1361 */ 1362 if (ifma->ifma_protospec != 0) { 1363 crit_exit(); 1364 return ifma->ifma_protospec; 1365 } 1366 1367 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 1368 at interrupt time? If so, need to fix if_addmulti. XXX */ 1369 inm = kmalloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO); 1370 inm->inm_addr = *ap; 1371 inm->inm_ifp = ifp; 1372 inm->inm_ifma = ifma; 1373 ifma->ifma_protospec = inm; 1374 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 1375 1376 /* 1377 * Let IGMP know that we have joined a new IP multicast group. 1378 */ 1379 igmp_joingroup(inm); 1380 crit_exit(); 1381 return (inm); 1382 } 1383 1384 /* 1385 * Delete a multicast address record. 1386 */ 1387 void 1388 in_delmulti(struct in_multi *inm) 1389 { 1390 struct ifmultiaddr *ifma; 1391 struct in_multi my_inm; 1392 1393 crit_enter(); 1394 ifma = inm->inm_ifma; 1395 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 1396 if (ifma->ifma_refcount == 1) { 1397 /* 1398 * No remaining claims to this record; let IGMP know that 1399 * we are leaving the multicast group. 1400 * But do it after the if_delmulti() which might reset 1401 * the interface and nuke the packet. 1402 */ 1403 my_inm = *inm ; 1404 ifma->ifma_protospec = 0; 1405 LIST_REMOVE(inm, inm_link); 1406 kfree(inm, M_IPMADDR); 1407 } 1408 /* XXX - should be separate API for when we have an ifma? */ 1409 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1410 if (my_inm.inm_ifp != NULL) 1411 igmp_leavegroup(&my_inm); 1412 crit_exit(); 1413 } 1414 1415 void 1416 in_ifdetach(struct ifnet *ifp) 1417 { 1418 in_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp); 1419 1420 udbinfo_lock(); 1421 in_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp); 1422 udbinfo_unlock(); 1423 }
Cache object: 2deb95d74d8f35acc9ea5e583d182102
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