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 */ 36 37 #include "opt_bootp.h" 38 #include "opt_carp.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 #include <netinet/udp_var.h> 62 63 #include <netinet/igmp_var.h> 64 65 MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address"); 66 67 static int in_mask2len (struct in_addr *); 68 static void in_len2mask (struct in_addr *, int); 69 static int in_lifaddr_ioctl (struct socket *, u_long, caddr_t, 70 struct ifnet *, struct thread *); 71 72 static void in_socktrim (struct sockaddr_in *); 73 static int in_ifinit(struct ifnet *, struct in_ifaddr *, 74 const struct sockaddr_in *, int); 75 76 static int in_control_internal(u_long, caddr_t, struct ifnet *, 77 struct thread *); 78 static int in_control_redispatch(u_long, caddr_t, struct ifnet *, 79 struct thread *); 80 81 static int in_addprefix(struct in_ifaddr *, int); 82 static void in_scrubprefix(struct in_ifaddr *); 83 84 static int subnetsarelocal = 0; 85 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 86 &subnetsarelocal, 0, 87 "Count all internet addresses of subnets of the local net as local"); 88 89 struct in_multihead in_multihead; /* XXX BSS initialization */ 90 91 extern struct inpcbinfo ripcbinfo; 92 93 /* 94 * Return 1 if an internet address is for a ``local'' host 95 * (one to which we have a connection). If subnetsarelocal 96 * is true, this includes other subnets of the local net. 97 * Otherwise, it includes only the directly-connected (sub)nets. 98 */ 99 int 100 in_localaddr(struct in_addr in) 101 { 102 u_long i = ntohl(in.s_addr); 103 struct in_ifaddr_container *iac; 104 struct in_ifaddr *ia; 105 106 if (subnetsarelocal) { 107 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 108 ia = iac->ia; 109 110 if ((i & ia->ia_netmask) == ia->ia_net) 111 return (1); 112 } 113 } else { 114 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 115 ia = iac->ia; 116 117 if ((i & ia->ia_subnetmask) == ia->ia_subnet) 118 return (1); 119 } 120 } 121 return (0); 122 } 123 124 /* 125 * Determine whether an IP address is in a reserved set of addresses 126 * that may not be forwarded, or whether datagrams to that destination 127 * may be forwarded. 128 */ 129 int 130 in_canforward(struct in_addr in) 131 { 132 u_long i = ntohl(in.s_addr); 133 u_long net; 134 135 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) 136 return (0); 137 if (IN_CLASSA(i)) { 138 net = i & IN_CLASSA_NET; 139 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 140 return (0); 141 } 142 return (1); 143 } 144 145 /* 146 * Trim a mask in a sockaddr 147 */ 148 static void 149 in_socktrim(struct sockaddr_in *ap) 150 { 151 char *cplim = (char *) &ap->sin_addr; 152 char *cp = (char *) (&ap->sin_addr + 1); 153 154 ap->sin_len = 0; 155 while (--cp >= cplim) 156 if (*cp) { 157 (ap)->sin_len = cp - (char *) (ap) + 1; 158 break; 159 } 160 } 161 162 static int 163 in_mask2len(struct in_addr *mask) 164 { 165 int x, y; 166 u_char *p; 167 168 p = (u_char *)mask; 169 for (x = 0; x < sizeof *mask; x++) { 170 if (p[x] != 0xff) 171 break; 172 } 173 y = 0; 174 if (x < sizeof *mask) { 175 for (y = 0; y < 8; y++) { 176 if ((p[x] & (0x80 >> y)) == 0) 177 break; 178 } 179 } 180 return x * 8 + y; 181 } 182 183 static void 184 in_len2mask(struct in_addr *mask, int len) 185 { 186 int i; 187 u_char *p; 188 189 p = (u_char *)mask; 190 bzero(mask, sizeof *mask); 191 for (i = 0; i < len / 8; i++) 192 p[i] = 0xff; 193 if (len % 8) 194 p[i] = (0xff00 >> (len % 8)) & 0xff; 195 } 196 197 static int in_interfaces; /* number of external internet interfaces */ 198 199 void 200 in_control_dispatch(netmsg_t msg) 201 { 202 int error; 203 204 error = in_control_redispatch(msg->control.nm_cmd, 205 msg->control.nm_data, 206 msg->control.nm_ifp, 207 msg->control.nm_td); 208 lwkt_replymsg(&msg->lmsg, error); 209 } 210 211 static void 212 in_control_internal_dispatch(netmsg_t msg) 213 { 214 int error; 215 216 error = in_control_internal(msg->control.nm_cmd, 217 msg->control.nm_data, 218 msg->control.nm_ifp, 219 msg->control.nm_td); 220 lwkt_replymsg(&msg->lmsg, error); 221 } 222 223 static int 224 in_control_redispatch(u_long cmd, caddr_t data, struct ifnet *ifp, 225 struct thread *td) 226 { 227 struct netmsg_pru_control msg; 228 int error; 229 230 /* 231 * IFADDR alterations are serialized by netisr0 232 */ 233 switch (cmd) { 234 case SIOCSIFDSTADDR: 235 case SIOCSIFBRDADDR: 236 case SIOCSIFADDR: 237 case SIOCSIFNETMASK: 238 case SIOCAIFADDR: 239 case SIOCDIFADDR: 240 netmsg_init(&msg.base, NULL, &curthread->td_msgport, 241 0, in_control_internal_dispatch); 242 msg.nm_cmd = cmd; 243 msg.nm_data = data; 244 msg.nm_ifp = ifp; 245 msg.nm_td = td; 246 lwkt_domsg(netisr_portfn(0), &msg.base.lmsg, 0); 247 error = msg.base.lmsg.ms_error; 248 break; 249 250 default: 251 error = in_control_internal(cmd, data, ifp, td); 252 break; 253 } 254 return error; 255 } 256 257 /* 258 * Generic internet control operations (ioctl's). 259 * Ifp is 0 if not an interface-specific ioctl. 260 * 261 * NOTE! td might be NULL. 262 */ 263 /* ARGSUSED */ 264 int 265 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 266 struct thread *td) 267 { 268 int error; 269 270 switch (cmd) { 271 case SIOCALIFADDR: 272 case SIOCDLIFADDR: 273 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 274 return error; 275 /* FALLTHROUGH */ 276 case SIOCGLIFADDR: 277 if (!ifp) 278 return EINVAL; 279 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 280 } 281 282 KASSERT(cmd != SIOCALIFADDR && cmd != SIOCDLIFADDR, 283 ("recursive SIOC%cLIFADDR!", 284 cmd == SIOCDLIFADDR ? 'D' : 'A')); 285 286 return in_control_redispatch(cmd, data, ifp, td); 287 } 288 289 static void 290 in_ialink_dispatch(netmsg_t msg) 291 { 292 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 293 struct ifaddr_container *ifac; 294 struct in_ifaddr_container *iac; 295 int cpu = mycpuid; 296 297 crit_enter(); 298 299 ifac = &ia->ia_ifa.ifa_containers[cpu]; 300 ASSERT_IFAC_VALID(ifac); 301 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD) == 0, 302 ("ia is on in_ifaddrheads")); 303 304 ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHEAD; 305 iac = &ifac->ifa_proto_u.u_in_ifac; 306 TAILQ_INSERT_TAIL(&in_ifaddrheads[cpu], iac, ia_link); 307 308 crit_exit(); 309 310 ifa_forwardmsg(&msg->lmsg, cpu + 1); 311 } 312 313 static void 314 in_iaunlink_dispatch(netmsg_t msg) 315 { 316 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 317 struct ifaddr_container *ifac; 318 struct in_ifaddr_container *iac; 319 int cpu = mycpuid; 320 321 crit_enter(); 322 323 ifac = &ia->ia_ifa.ifa_containers[cpu]; 324 ASSERT_IFAC_VALID(ifac); 325 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD, 326 ("ia is not on in_ifaddrheads")); 327 328 iac = &ifac->ifa_proto_u.u_in_ifac; 329 TAILQ_REMOVE(&in_ifaddrheads[cpu], iac, ia_link); 330 ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHEAD; 331 332 crit_exit(); 333 334 ifa_forwardmsg(&msg->lmsg, cpu + 1); 335 } 336 337 static void 338 in_iahashins_dispatch(netmsg_t msg) 339 { 340 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 341 struct ifaddr_container *ifac; 342 struct in_ifaddr_container *iac; 343 int cpu = mycpuid; 344 345 crit_enter(); 346 347 ifac = &ia->ia_ifa.ifa_containers[cpu]; 348 ASSERT_IFAC_VALID(ifac); 349 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0, 350 ("ia is on in_ifaddrhashtbls")); 351 352 ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHASH; 353 iac = &ifac->ifa_proto_u.u_in_ifac; 354 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 355 iac, ia_hash); 356 357 crit_exit(); 358 359 ifa_forwardmsg(&msg->lmsg, cpu + 1); 360 } 361 362 static void 363 in_iahashrem_dispatch(netmsg_t msg) 364 { 365 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 366 struct ifaddr_container *ifac; 367 struct in_ifaddr_container *iac; 368 int cpu = mycpuid; 369 370 crit_enter(); 371 372 ifac = &ia->ia_ifa.ifa_containers[cpu]; 373 ASSERT_IFAC_VALID(ifac); 374 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH, 375 ("ia is not on in_ifaddrhashtbls")); 376 377 iac = &ifac->ifa_proto_u.u_in_ifac; 378 LIST_REMOVE(iac, ia_hash); 379 ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHASH; 380 381 crit_exit(); 382 383 ifa_forwardmsg(&msg->lmsg, cpu + 1); 384 } 385 386 static void 387 in_ialink(struct in_ifaddr *ia) 388 { 389 struct netmsg_base msg; 390 391 netmsg_init(&msg, NULL, &curthread->td_msgport, 392 0, in_ialink_dispatch); 393 msg.lmsg.u.ms_resultp = ia; 394 395 ifa_domsg(&msg.lmsg, 0); 396 } 397 398 void 399 in_iaunlink(struct in_ifaddr *ia) 400 { 401 struct netmsg_base msg; 402 403 netmsg_init(&msg, NULL, &curthread->td_msgport, 404 0, in_iaunlink_dispatch); 405 msg.lmsg.u.ms_resultp = ia; 406 407 ifa_domsg(&msg.lmsg, 0); 408 } 409 410 void 411 in_iahash_insert(struct in_ifaddr *ia) 412 { 413 struct netmsg_base msg; 414 415 netmsg_init(&msg, NULL, &curthread->td_msgport, 416 0, in_iahashins_dispatch); 417 msg.lmsg.u.ms_resultp = ia; 418 419 ifa_domsg(&msg.lmsg, 0); 420 } 421 422 void 423 in_iahash_remove(struct in_ifaddr *ia) 424 { 425 struct netmsg_base msg; 426 427 netmsg_init(&msg, NULL, &curthread->td_msgport, 428 0, in_iahashrem_dispatch); 429 msg.lmsg.u.ms_resultp = ia; 430 431 ifa_domsg(&msg.lmsg, 0); 432 } 433 434 static __inline struct in_ifaddr * 435 in_ianext(struct in_ifaddr *oia) 436 { 437 struct ifaddr_container *ifac; 438 struct in_ifaddr_container *iac; 439 440 ifac = &oia->ia_ifa.ifa_containers[mycpuid]; 441 ASSERT_IFAC_VALID(ifac); 442 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD, 443 ("ia is not on in_ifaddrheads")); 444 445 iac = &ifac->ifa_proto_u.u_in_ifac; 446 iac = TAILQ_NEXT(iac, ia_link); 447 if (iac != NULL) 448 return iac->ia; 449 else 450 return NULL; 451 } 452 453 static int 454 in_control_internal(u_long cmd, caddr_t data, struct ifnet *ifp, 455 struct thread *td) 456 { 457 struct ifreq *ifr = (struct ifreq *)data; 458 struct in_ifaddr *ia = NULL; 459 struct in_addr dst; 460 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 461 struct ifaddr_container *ifac; 462 struct in_ifaddr_container *iac; 463 struct sockaddr_in oldaddr; 464 int hostIsNew, iaIsNew, maskIsNew, ifpWasUp; 465 int error = 0; 466 467 iaIsNew = 0; 468 ifpWasUp = 0; 469 470 /* 471 * Find address for this interface, if it exists. 472 * 473 * If an alias address was specified, find that one instead of 474 * the first one on the interface, if possible 475 */ 476 if (ifp) { 477 struct in_ifaddr *iap; 478 479 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 480 LIST_FOREACH(iac, INADDR_HASH(dst.s_addr), ia_hash) { 481 iap = iac->ia; 482 if (iap->ia_ifp == ifp && 483 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 484 ia = iap; 485 break; 486 } 487 } 488 if (ia == NULL) { 489 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], 490 ifa_link) { 491 iap = ifatoia(ifac->ifa); 492 if (iap->ia_addr.sin_family == AF_INET) { 493 ia = iap; 494 break; 495 } 496 } 497 } 498 499 if (ifp->if_flags & IFF_UP) 500 ifpWasUp = 1; 501 } 502 503 switch (cmd) { 504 case SIOCAIFADDR: 505 case SIOCDIFADDR: 506 if (ifp == NULL) 507 return (EADDRNOTAVAIL); 508 if (ifra->ifra_addr.sin_family == AF_INET) { 509 while (ia != NULL) { 510 if (ia->ia_ifp == ifp && 511 ia->ia_addr.sin_addr.s_addr == 512 ifra->ifra_addr.sin_addr.s_addr) 513 break; 514 ia = in_ianext(ia); 515 } 516 if ((ifp->if_flags & IFF_POINTOPOINT) && 517 cmd == SIOCAIFADDR && 518 ifra->ifra_dstaddr.sin_addr.s_addr == INADDR_ANY) { 519 return EDESTADDRREQ; 520 } 521 } 522 if (cmd == SIOCDIFADDR && ia == NULL) 523 return (EADDRNOTAVAIL); 524 /* FALLTHROUGH */ 525 case SIOCSIFADDR: 526 case SIOCSIFNETMASK: 527 case SIOCSIFDSTADDR: 528 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 529 return error; 530 531 if (ifp == NULL) 532 return (EADDRNOTAVAIL); 533 534 if (cmd == SIOCSIFDSTADDR && 535 (ifp->if_flags & IFF_POINTOPOINT) == 0) 536 return (EINVAL); 537 538 if (ia == NULL) { 539 struct ifaddr *ifa; 540 int i; 541 542 ia = ifa_create(sizeof(*ia), M_WAITOK); 543 ifa = &ia->ia_ifa; 544 545 /* 546 * Setup per-CPU information 547 */ 548 for (i = 0; i < ncpus; ++i) { 549 ifac = &ifa->ifa_containers[i]; 550 iac = &ifac->ifa_proto_u.u_in_ifac; 551 iac->ia = ia; 552 iac->ia_ifac = ifac; 553 } 554 555 /* 556 * Protect from NETISR_IP traversing address list 557 * while we're modifying it. 558 */ 559 crit_enter(); 560 561 in_ialink(ia); 562 ifa_iflink(ifa, ifp, 1); 563 564 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 565 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 566 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 567 ia->ia_sockmask.sin_len = 8; 568 ia->ia_sockmask.sin_family = AF_INET; 569 if (ifp->if_flags & IFF_BROADCAST) { 570 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr; 571 ia->ia_broadaddr.sin_family = AF_INET; 572 } 573 ia->ia_ifp = ifp; 574 if (!(ifp->if_flags & IFF_LOOPBACK)) 575 in_interfaces++; 576 iaIsNew = 1; 577 578 crit_exit(); 579 } 580 break; 581 582 case SIOCSIFBRDADDR: 583 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 584 return error; 585 /* FALLTHROUGH */ 586 587 case SIOCGIFADDR: 588 case SIOCGIFNETMASK: 589 case SIOCGIFDSTADDR: 590 case SIOCGIFBRDADDR: 591 if (ia == NULL) 592 return (EADDRNOTAVAIL); 593 break; 594 } 595 596 switch (cmd) { 597 case SIOCGIFADDR: 598 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 599 return (0); 600 601 case SIOCGIFBRDADDR: 602 if ((ifp->if_flags & IFF_BROADCAST) == 0) 603 return (EINVAL); 604 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 605 return (0); 606 607 case SIOCGIFDSTADDR: 608 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 609 return (EINVAL); 610 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 611 return (0); 612 613 case SIOCGIFNETMASK: 614 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 615 return (0); 616 617 case SIOCSIFDSTADDR: 618 KKASSERT(ifp->if_flags & IFF_POINTOPOINT); 619 620 oldaddr = ia->ia_dstaddr; 621 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 622 if (ifp->if_ioctl != NULL) { 623 ifnet_serialize_all(ifp); 624 error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia, 625 td->td_proc->p_ucred); 626 ifnet_deserialize_all(ifp); 627 if (error) { 628 ia->ia_dstaddr = oldaddr; 629 return (error); 630 } 631 } 632 if (ia->ia_flags & IFA_ROUTE) { 633 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 634 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 635 ia->ia_ifa.ifa_dstaddr = 636 (struct sockaddr *)&ia->ia_dstaddr; 637 rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP); 638 } 639 return (0); 640 641 case SIOCSIFBRDADDR: 642 if ((ifp->if_flags & IFF_BROADCAST) == 0) 643 return (EINVAL); 644 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 645 return (0); 646 647 case SIOCSIFADDR: 648 error = in_ifinit(ifp, ia, 649 (const struct sockaddr_in *)&ifr->ifr_addr, 1); 650 if (error != 0 && iaIsNew) 651 break; 652 if (error == 0) { 653 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 654 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 655 &ia->ia_ifa); 656 } 657 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) { 658 /* 659 * Interface is brought up by in_ifinit() 660 * (via ifp->if_ioctl). We act as if the 661 * interface got IFF_UP flag turned on. 662 */ 663 if_up(ifp); 664 } 665 return (0); 666 667 case SIOCSIFNETMASK: 668 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 669 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 670 return (0); 671 672 case SIOCAIFADDR: 673 maskIsNew = 0; 674 hostIsNew = 1; 675 error = 0; 676 if (ia->ia_addr.sin_family == AF_INET) { 677 if (ifra->ifra_addr.sin_len == 0) { 678 ifra->ifra_addr = ia->ia_addr; 679 hostIsNew = 0; 680 } else if (ifra->ifra_addr.sin_addr.s_addr == 681 ia->ia_addr.sin_addr.s_addr) { 682 hostIsNew = 0; 683 } 684 } 685 if (ifra->ifra_mask.sin_len) { 686 in_ifscrub(ifp, ia); 687 ia->ia_sockmask = ifra->ifra_mask; 688 ia->ia_sockmask.sin_family = AF_INET; 689 ia->ia_subnetmask = 690 ntohl(ia->ia_sockmask.sin_addr.s_addr); 691 maskIsNew = 1; 692 } 693 if ((ifp->if_flags & IFF_POINTOPOINT) && 694 ifra->ifra_dstaddr.sin_family == AF_INET) { 695 in_ifscrub(ifp, ia); 696 ia->ia_dstaddr = ifra->ifra_dstaddr; 697 maskIsNew = 1; /* We lie; but the effect's the same */ 698 } 699 if (ifra->ifra_addr.sin_family == AF_INET && 700 (hostIsNew || maskIsNew)) 701 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 702 703 if (error != 0 && iaIsNew) 704 break; 705 706 if ((ifp->if_flags & IFF_BROADCAST) && 707 ifra->ifra_broadaddr.sin_family == AF_INET) 708 ia->ia_broadaddr = ifra->ifra_broadaddr; 709 if (error == 0) { 710 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 711 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 712 &ia->ia_ifa); 713 } 714 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) { 715 /* See the comment in SIOCSIFADDR */ 716 if_up(ifp); 717 } 718 return (error); 719 720 case SIOCDIFADDR: 721 /* 722 * in_ifscrub kills the interface route. 723 */ 724 in_ifscrub(ifp, ia); 725 /* 726 * in_ifadown gets rid of all the rest of 727 * the routes. This is not quite the right 728 * thing to do, but at least if we are running 729 * a routing process they will come back. 730 */ 731 in_ifadown(&ia->ia_ifa, 1); 732 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE, 733 &ia->ia_ifa); 734 error = 0; 735 break; 736 737 default: 738 if (ifp == NULL || ifp->if_ioctl == NULL) 739 return (EOPNOTSUPP); 740 ifnet_serialize_all(ifp); 741 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred); 742 ifnet_deserialize_all(ifp); 743 return (error); 744 } 745 746 KKASSERT(cmd == SIOCDIFADDR || 747 ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && iaIsNew)); 748 749 ifa_ifunlink(&ia->ia_ifa, ifp); 750 in_iaunlink(ia); 751 752 if (cmd == SIOCDIFADDR) { 753 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 754 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) 755 in_iahash_remove(ia); 756 } 757 #ifdef INVARIANTS 758 else { 759 /* 760 * If cmd is SIOCSIFADDR or SIOCAIFADDR, in_ifinit() has 761 * already taken care of the deletion from hash table 762 */ 763 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 764 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0, 765 ("SIOC%cIFADDR failed on new ia, " 766 "but the new ia is still in hash table", 767 cmd == SIOCSIFADDR ? 'S' : 'A')); 768 } 769 #endif 770 771 ifa_destroy(&ia->ia_ifa); 772 773 if ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && 774 !ifpWasUp && (ifp->if_flags & IFF_UP)) { 775 /* 776 * Though the address assignment failed, the 777 * interface is brought up by in_ifinit() 778 * (via ifp->if_ioctl). With the hope that 779 * the interface has some valid addresses, we 780 * act as if IFF_UP flag was just set on the 781 * interface. 782 * 783 * NOTE: 784 * This could only be done after the failed 785 * address is unlinked from the global address 786 * list. 787 */ 788 if_up(ifp); 789 } 790 791 return (error); 792 } 793 794 /* 795 * SIOC[GAD]LIFADDR. 796 * SIOCGLIFADDR: get first address. (?!?) 797 * SIOCGLIFADDR with IFLR_PREFIX: 798 * get first address that matches the specified prefix. 799 * SIOCALIFADDR: add the specified address. 800 * SIOCALIFADDR with IFLR_PREFIX: 801 * EINVAL since we can't deduce hostid part of the address. 802 * SIOCDLIFADDR: delete the specified address. 803 * SIOCDLIFADDR with IFLR_PREFIX: 804 * delete the first address that matches the specified prefix. 805 * return values: 806 * EINVAL on invalid parameters 807 * EADDRNOTAVAIL on prefix match failed/specified address not found 808 * other values may be returned from in_ioctl() 809 * 810 * NOTE! td might be NULL. 811 */ 812 static int 813 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 814 struct thread *td) 815 { 816 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 817 818 /* sanity checks */ 819 if (!data || !ifp) { 820 panic("invalid argument to in_lifaddr_ioctl"); 821 /*NOTRECHED*/ 822 } 823 824 switch (cmd) { 825 case SIOCGLIFADDR: 826 /* address must be specified on GET with IFLR_PREFIX */ 827 if ((iflr->flags & IFLR_PREFIX) == 0) 828 break; 829 /*FALLTHROUGH*/ 830 case SIOCALIFADDR: 831 case SIOCDLIFADDR: 832 /* address must be specified on ADD and DELETE */ 833 if (iflr->addr.ss_family != AF_INET) 834 return EINVAL; 835 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 836 return EINVAL; 837 /* XXX need improvement */ 838 if (iflr->dstaddr.ss_family 839 && iflr->dstaddr.ss_family != AF_INET) 840 return EINVAL; 841 if (iflr->dstaddr.ss_family 842 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 843 return EINVAL; 844 break; 845 default: /*shouldn't happen*/ 846 return EOPNOTSUPP; 847 } 848 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 849 return EINVAL; 850 851 switch (cmd) { 852 case SIOCALIFADDR: 853 { 854 struct in_aliasreq ifra; 855 856 if (iflr->flags & IFLR_PREFIX) 857 return EINVAL; 858 859 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 860 bzero(&ifra, sizeof ifra); 861 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name); 862 863 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 864 865 if (iflr->dstaddr.ss_family) { /*XXX*/ 866 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 867 iflr->dstaddr.ss_len); 868 } 869 870 ifra.ifra_mask.sin_family = AF_INET; 871 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 872 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 873 874 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 875 } 876 case SIOCGLIFADDR: 877 case SIOCDLIFADDR: 878 { 879 struct ifaddr_container *ifac; 880 struct in_ifaddr *ia; 881 struct in_addr mask, candidate, match; 882 struct sockaddr_in *sin; 883 int cmp; 884 885 bzero(&mask, sizeof mask); 886 if (iflr->flags & IFLR_PREFIX) { 887 /* lookup a prefix rather than address. */ 888 in_len2mask(&mask, iflr->prefixlen); 889 890 sin = (struct sockaddr_in *)&iflr->addr; 891 match.s_addr = sin->sin_addr.s_addr; 892 match.s_addr &= mask.s_addr; 893 894 /* if you set extra bits, that's wrong */ 895 if (match.s_addr != sin->sin_addr.s_addr) 896 return EINVAL; 897 898 cmp = 1; 899 } else { 900 if (cmd == SIOCGLIFADDR) { 901 /* on getting an address, take the 1st match */ 902 match.s_addr = 0; /* gcc4 warning */ 903 cmp = 0; /*XXX*/ 904 } else { 905 /* on deleting an address, do exact match */ 906 in_len2mask(&mask, 32); 907 sin = (struct sockaddr_in *)&iflr->addr; 908 match.s_addr = sin->sin_addr.s_addr; 909 910 cmp = 1; 911 } 912 } 913 914 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 915 struct ifaddr *ifa = ifac->ifa; 916 917 if (ifa->ifa_addr->sa_family != AF_INET6) 918 continue; 919 if (!cmp) 920 break; 921 candidate.s_addr = 922 ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 923 candidate.s_addr &= mask.s_addr; 924 if (candidate.s_addr == match.s_addr) 925 break; 926 } 927 if (ifac == NULL) 928 return EADDRNOTAVAIL; 929 ia = (struct in_ifaddr *)(ifac->ifa); 930 931 if (cmd == SIOCGLIFADDR) { 932 /* fill in the if_laddrreq structure */ 933 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 934 935 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 936 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 937 ia->ia_dstaddr.sin_len); 938 } else 939 bzero(&iflr->dstaddr, sizeof iflr->dstaddr); 940 941 iflr->prefixlen = 942 in_mask2len(&ia->ia_sockmask.sin_addr); 943 944 iflr->flags = 0; /*XXX*/ 945 946 return 0; 947 } else { 948 struct in_aliasreq ifra; 949 950 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 951 bzero(&ifra, sizeof ifra); 952 bcopy(iflr->iflr_name, ifra.ifra_name, 953 sizeof ifra.ifra_name); 954 955 bcopy(&ia->ia_addr, &ifra.ifra_addr, 956 ia->ia_addr.sin_len); 957 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 958 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 959 ia->ia_dstaddr.sin_len); 960 } 961 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 962 ia->ia_sockmask.sin_len); 963 964 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 965 ifp, td); 966 } 967 } 968 } 969 970 return EOPNOTSUPP; /*just for safety*/ 971 } 972 973 /* 974 * Delete any existing route for an interface. 975 */ 976 void 977 in_ifscrub(struct ifnet *ifp __unused, struct in_ifaddr *ia) 978 { 979 in_scrubprefix(ia); 980 } 981 982 /* 983 * Initialize an interface's internet address 984 * and routing table entry. 985 */ 986 static int 987 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, 988 const struct sockaddr_in *sin, int scrub) 989 { 990 u_long i = ntohl(sin->sin_addr.s_addr); 991 struct sockaddr_in oldaddr; 992 struct ifaddr_container *ifac; 993 int flags = RTF_UP, error = 0; 994 int was_hash = 0; 995 996 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 997 oldaddr = ia->ia_addr; 998 999 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) { 1000 was_hash = 1; 1001 in_iahash_remove(ia); 1002 } 1003 1004 ia->ia_addr = *sin; 1005 if (ia->ia_addr.sin_family == AF_INET) 1006 in_iahash_insert(ia); 1007 1008 /* 1009 * Give the interface a chance to initialize 1010 * if this is its first address, 1011 * and to validate the address if necessary. 1012 */ 1013 if (ifp->if_ioctl != NULL) { 1014 ifnet_serialize_all(ifp); 1015 error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL); 1016 ifnet_deserialize_all(ifp); 1017 if (error) 1018 goto fail; 1019 } 1020 1021 /* 1022 * Delete old route, if requested. 1023 */ 1024 if (scrub) { 1025 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 1026 in_ifscrub(ifp, ia); 1027 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1028 } 1029 1030 /* 1031 * Calculate netmask/subnetmask. 1032 */ 1033 if (IN_CLASSA(i)) 1034 ia->ia_netmask = IN_CLASSA_NET; 1035 else if (IN_CLASSB(i)) 1036 ia->ia_netmask = IN_CLASSB_NET; 1037 else 1038 ia->ia_netmask = IN_CLASSC_NET; 1039 /* 1040 * The subnet mask usually includes at least the standard network part, 1041 * but may may be smaller in the case of supernetting. 1042 * If it is set, we believe it. 1043 */ 1044 if (ia->ia_subnetmask == 0) { 1045 ia->ia_subnetmask = ia->ia_netmask; 1046 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 1047 } else { 1048 ia->ia_netmask &= ia->ia_subnetmask; 1049 } 1050 ia->ia_net = i & ia->ia_netmask; 1051 ia->ia_subnet = i & ia->ia_subnetmask; 1052 in_socktrim(&ia->ia_sockmask); 1053 1054 /* 1055 * Add route for the network. 1056 */ 1057 ia->ia_ifa.ifa_metric = ifp->if_metric; 1058 if (ifp->if_flags & IFF_BROADCAST) { 1059 ia->ia_broadaddr.sin_addr.s_addr = 1060 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 1061 ia->ia_netbroadcast.s_addr = 1062 htonl(ia->ia_net | ~ ia->ia_netmask); 1063 } else if (ifp->if_flags & IFF_LOOPBACK) { 1064 ia->ia_dstaddr = ia->ia_addr; 1065 flags |= RTF_HOST; 1066 } else if (ifp->if_flags & IFF_POINTOPOINT) { 1067 if (ia->ia_dstaddr.sin_family != AF_INET) 1068 return (0); 1069 flags |= RTF_HOST; 1070 } 1071 1072 /*- 1073 * Don't add host routes for interface addresses of 1074 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it 1075 * possible to assign several such address pairs with consistent 1076 * results (no host route) and is required by BOOTP. 1077 * 1078 * XXX: This is ugly ! There should be a way for the caller to 1079 * say that they don't want a host route. 1080 */ 1081 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY || 1082 ia->ia_netmask != IN_CLASSA_NET || 1083 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) { 1084 error = in_addprefix(ia, flags); 1085 if (error) 1086 goto fail; 1087 } 1088 1089 /* 1090 * If the interface supports multicast, join the "all hosts" 1091 * multicast group on that interface. 1092 */ 1093 if (ifp->if_flags & IFF_MULTICAST) { 1094 struct in_addr addr; 1095 1096 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 1097 in_addmulti(&addr, ifp); 1098 } 1099 return (0); 1100 fail: 1101 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) 1102 in_iahash_remove(ia); 1103 1104 ia->ia_addr = oldaddr; 1105 if (was_hash) 1106 in_iahash_insert(ia); 1107 return (error); 1108 } 1109 1110 #define rtinitflags(x) \ 1111 (((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) \ 1112 ? RTF_HOST : 0) 1113 1114 /* 1115 * Add a route to prefix ("connected route" in cisco terminology). 1116 * Do nothing, if there are some interface addresses with the same 1117 * prefix already. This function assumes that the 'target' parent 1118 * interface is UP. 1119 */ 1120 static int 1121 in_addprefix(struct in_ifaddr *target, int flags) 1122 { 1123 struct in_ifaddr_container *iac; 1124 struct in_addr prefix, mask; 1125 int error; 1126 1127 #ifdef CARP 1128 /* 1129 * Don't add prefix routes for CARP interfaces. 1130 * Prefix routes creation is handled by CARP 1131 * interfaces themselves. 1132 */ 1133 if (target->ia_ifp->if_type == IFT_CARP) 1134 return 0; 1135 #endif 1136 1137 mask = target->ia_sockmask.sin_addr; 1138 if (flags & RTF_HOST) { 1139 prefix = target->ia_dstaddr.sin_addr; 1140 } else { 1141 prefix = target->ia_addr.sin_addr; 1142 prefix.s_addr &= mask.s_addr; 1143 } 1144 1145 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 1146 struct in_ifaddr *ia = iac->ia; 1147 struct in_addr p; 1148 1149 /* Don't test against self */ 1150 if (ia == target) 1151 continue; 1152 1153 /* The tested address does not own a route entry */ 1154 if ((ia->ia_flags & IFA_ROUTE) == 0) 1155 continue; 1156 1157 /* Prefix test */ 1158 if (rtinitflags(ia)) { 1159 p = ia->ia_dstaddr.sin_addr; 1160 } else { 1161 p = ia->ia_addr.sin_addr; 1162 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1163 } 1164 if (prefix.s_addr != p.s_addr) 1165 continue; 1166 1167 /* 1168 * If the to-be-added address and the curretly being 1169 * tested address are not host addresses, we need to 1170 * take subnetmask into consideration. 1171 */ 1172 if (!(flags & RTF_HOST) && !rtinitflags(ia) && 1173 mask.s_addr != ia->ia_sockmask.sin_addr.s_addr) 1174 continue; 1175 1176 /* 1177 * If we got a matching prefix route inserted by other 1178 * interface address, we don't need to bother. 1179 */ 1180 return 0; 1181 } 1182 1183 /* 1184 * No one seem to have prefix route; insert it. 1185 */ 1186 error = rtinit(&target->ia_ifa, RTM_ADD, flags); 1187 if (!error) 1188 target->ia_flags |= IFA_ROUTE; 1189 return error; 1190 } 1191 1192 /* 1193 * Remove a route to prefix ("connected route" in cisco terminology). 1194 * Re-installs the route by using another interface address, if there's 1195 * one with the same prefix (otherwise we lose the route mistakenly). 1196 */ 1197 static void 1198 in_scrubprefix(struct in_ifaddr *target) 1199 { 1200 struct in_ifaddr_container *iac; 1201 struct in_addr prefix, mask; 1202 int error; 1203 1204 if ((target->ia_flags & IFA_ROUTE) == 0) 1205 return; 1206 1207 mask = target->ia_sockmask.sin_addr; 1208 if (rtinitflags(target)) { 1209 prefix = target->ia_dstaddr.sin_addr; 1210 } else { 1211 prefix = target->ia_addr.sin_addr; 1212 prefix.s_addr &= mask.s_addr; 1213 } 1214 1215 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 1216 struct in_ifaddr *ia = iac->ia; 1217 struct in_addr p; 1218 1219 /* Don't test against self */ 1220 if (ia == target) 1221 continue; 1222 1223 /* The tested address already owns a route entry */ 1224 if (ia->ia_flags & IFA_ROUTE) 1225 continue; 1226 1227 /* 1228 * The prefix route of the tested address should 1229 * never be installed if its parent interface is 1230 * not UP yet. 1231 */ 1232 if ((ia->ia_ifp->if_flags & IFF_UP) == 0) 1233 continue; 1234 1235 #ifdef CARP 1236 /* 1237 * Don't add prefix routes for CARP interfaces. 1238 * Prefix routes creation is handled by CARP 1239 * interfaces themselves. 1240 */ 1241 if (ia->ia_ifp->if_type == IFT_CARP) 1242 continue; 1243 #endif 1244 1245 /* Prefix test */ 1246 if (rtinitflags(ia)) { 1247 p = ia->ia_dstaddr.sin_addr; 1248 } else { 1249 p = ia->ia_addr.sin_addr; 1250 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1251 } 1252 if (prefix.s_addr != p.s_addr) 1253 continue; 1254 1255 /* 1256 * We don't need to test subnetmask here, as what we do 1257 * in in_addprefix(), since if the the tested address's 1258 * parent interface is UP, the tested address should own 1259 * a prefix route entry and we would never reach here. 1260 */ 1261 1262 /* 1263 * If we got a matching prefix route, move IFA_ROUTE to him 1264 */ 1265 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target)); 1266 target->ia_flags &= ~IFA_ROUTE; 1267 1268 error = rtinit(&ia->ia_ifa, RTM_ADD, rtinitflags(ia) | RTF_UP); 1269 if (!error) 1270 ia->ia_flags |= IFA_ROUTE; 1271 return; 1272 } 1273 1274 /* 1275 * No candidates for this prefix route; just remove it. 1276 */ 1277 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target)); 1278 target->ia_flags &= ~IFA_ROUTE; 1279 } 1280 1281 #undef rtinitflags 1282 1283 /* 1284 * Return 1 if the address might be a local broadcast address. 1285 */ 1286 int 1287 in_broadcast(struct in_addr in, struct ifnet *ifp) 1288 { 1289 struct ifaddr_container *ifac; 1290 u_long t; 1291 1292 if (in.s_addr == INADDR_BROADCAST || 1293 in.s_addr == INADDR_ANY) 1294 return 1; 1295 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1296 return 0; 1297 t = ntohl(in.s_addr); 1298 /* 1299 * Look through the list of addresses for a match 1300 * with a broadcast address. 1301 */ 1302 #define ia ((struct in_ifaddr *)ifa) 1303 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1304 struct ifaddr *ifa = ifac->ifa; 1305 1306 if (ifa->ifa_addr->sa_family == AF_INET && 1307 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1308 in.s_addr == ia->ia_netbroadcast.s_addr || 1309 /* 1310 * Check for old-style (host 0) broadcast. 1311 */ 1312 t == ia->ia_subnet || t == ia->ia_net) && 1313 /* 1314 * Check for an all one subnetmask. These 1315 * only exist when an interface gets a secondary 1316 * address. 1317 */ 1318 ia->ia_subnetmask != (u_long)0xffffffff) 1319 return 1; 1320 } 1321 return (0); 1322 #undef ia 1323 } 1324 /* 1325 * Add an address to the list of IP multicast addresses for a given interface. 1326 */ 1327 struct in_multi * 1328 in_addmulti(struct in_addr *ap, struct ifnet *ifp) 1329 { 1330 struct in_multi *inm; 1331 int error; 1332 struct sockaddr_in sin; 1333 struct ifmultiaddr *ifma; 1334 1335 /* 1336 * Call generic routine to add membership or increment 1337 * refcount. It wants addresses in the form of a sockaddr, 1338 * so we build one here (being careful to zero the unused bytes). 1339 */ 1340 bzero(&sin, sizeof sin); 1341 sin.sin_family = AF_INET; 1342 sin.sin_len = sizeof sin; 1343 sin.sin_addr = *ap; 1344 crit_enter(); 1345 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 1346 if (error) { 1347 crit_exit(); 1348 return 0; 1349 } 1350 1351 /* 1352 * If ifma->ifma_protospec is null, then if_addmulti() created 1353 * a new record. Otherwise, we are done. 1354 */ 1355 if (ifma->ifma_protospec != 0) { 1356 crit_exit(); 1357 return ifma->ifma_protospec; 1358 } 1359 1360 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 1361 at interrupt time? If so, need to fix if_addmulti. XXX */ 1362 inm = kmalloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO); 1363 inm->inm_addr = *ap; 1364 inm->inm_ifp = ifp; 1365 inm->inm_ifma = ifma; 1366 ifma->ifma_protospec = inm; 1367 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 1368 1369 /* 1370 * Let IGMP know that we have joined a new IP multicast group. 1371 */ 1372 igmp_joingroup(inm); 1373 crit_exit(); 1374 return (inm); 1375 } 1376 1377 /* 1378 * Delete a multicast address record. 1379 */ 1380 void 1381 in_delmulti(struct in_multi *inm) 1382 { 1383 struct ifmultiaddr *ifma; 1384 struct in_multi my_inm; 1385 1386 crit_enter(); 1387 ifma = inm->inm_ifma; 1388 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 1389 if (ifma->ifma_refcount == 1) { 1390 /* 1391 * No remaining claims to this record; let IGMP know that 1392 * we are leaving the multicast group. 1393 * But do it after the if_delmulti() which might reset 1394 * the interface and nuke the packet. 1395 */ 1396 my_inm = *inm ; 1397 ifma->ifma_protospec = 0; 1398 LIST_REMOVE(inm, inm_link); 1399 kfree(inm, M_IPMADDR); 1400 } 1401 /* XXX - should be separate API for when we have an ifma? */ 1402 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1403 if (my_inm.inm_ifp != NULL) 1404 igmp_leavegroup(&my_inm); 1405 crit_exit(); 1406 } 1407 1408 void 1409 in_ifdetach(struct ifnet *ifp) 1410 { 1411 in_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp); 1412 1413 udbinfo_lock(); 1414 in_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp); 1415 udbinfo_unlock(); 1416 } 1417