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 (u_long, caddr_t, struct ifnet *, struct thread *); 67 68 static void in_socktrim (struct sockaddr_in *); 69 static int in_ifinit(struct ifnet *, struct in_ifaddr *, 70 const struct sockaddr_in *, int); 71 72 static int in_control_internal(u_long, caddr_t, struct ifnet *, 73 struct thread *); 74 75 static int in_addprefix(struct in_ifaddr *, int); 76 static void in_scrubprefix(struct in_ifaddr *); 77 78 static int subnetsarelocal = 0; 79 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 80 &subnetsarelocal, 0, 81 "Count all internet addresses of subnets of the local net as local"); 82 83 struct in_multihead in_multihead; /* XXX BSS initialization */ 84 85 extern struct inpcbinfo ripcbinfo; 86 87 /* 88 * Return 1 if an internet address is for a ``local'' host 89 * (one to which we have a connection). If subnetsarelocal 90 * is true, this includes other subnets of the local net. 91 * Otherwise, it includes only the directly-connected (sub)nets. 92 */ 93 int 94 in_localaddr(struct in_addr in) 95 { 96 u_long i = ntohl(in.s_addr); 97 struct in_ifaddr_container *iac; 98 struct in_ifaddr *ia; 99 100 if (subnetsarelocal) { 101 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 102 ia = iac->ia; 103 104 if ((i & ia->ia_netmask) == ia->ia_net) 105 return (1); 106 } 107 } else { 108 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 109 ia = iac->ia; 110 111 if ((i & ia->ia_subnetmask) == ia->ia_subnet) 112 return (1); 113 } 114 } 115 return (0); 116 } 117 118 /* 119 * Determine whether an IP address is in a reserved set of addresses 120 * that may not be forwarded, or whether datagrams to that destination 121 * may be forwarded. 122 */ 123 int 124 in_canforward(struct in_addr in) 125 { 126 u_long i = ntohl(in.s_addr); 127 u_long net; 128 129 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) 130 return (0); 131 if (IN_CLASSA(i)) { 132 net = i & IN_CLASSA_NET; 133 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 134 return (0); 135 } 136 return (1); 137 } 138 139 /* 140 * Trim a mask in a sockaddr 141 */ 142 static void 143 in_socktrim(struct sockaddr_in *ap) 144 { 145 char *cplim = (char *) &ap->sin_addr; 146 char *cp = (char *) (&ap->sin_addr + 1); 147 148 ap->sin_len = 0; 149 while (--cp >= cplim) 150 if (*cp) { 151 (ap)->sin_len = cp - (char *) (ap) + 1; 152 break; 153 } 154 } 155 156 static int 157 in_mask2len(struct in_addr *mask) 158 { 159 int x, y; 160 u_char *p; 161 162 p = (u_char *)mask; 163 for (x = 0; x < sizeof *mask; x++) { 164 if (p[x] != 0xff) 165 break; 166 } 167 y = 0; 168 if (x < sizeof *mask) { 169 for (y = 0; y < 8; y++) { 170 if ((p[x] & (0x80 >> y)) == 0) 171 break; 172 } 173 } 174 return x * 8 + y; 175 } 176 177 static void 178 in_len2mask(struct in_addr *mask, int len) 179 { 180 int i; 181 u_char *p; 182 183 p = (u_char *)mask; 184 bzero(mask, sizeof *mask); 185 for (i = 0; i < len / 8; i++) 186 p[i] = 0xff; 187 if (len % 8) 188 p[i] = (0xff00 >> (len % 8)) & 0xff; 189 } 190 191 void 192 in_control_dispatch(netmsg_t msg) 193 { 194 int error; 195 196 error = in_control(msg->control.nm_cmd, msg->control.nm_data, 197 msg->control.nm_ifp, msg->control.nm_td); 198 lwkt_replymsg(&msg->lmsg, error); 199 } 200 201 static void 202 in_control_internal_dispatch(netmsg_t msg) 203 { 204 int error; 205 206 error = in_control_internal(msg->control.nm_cmd, 207 msg->control.nm_data, 208 msg->control.nm_ifp, 209 msg->control.nm_td); 210 lwkt_replymsg(&msg->lmsg, error); 211 } 212 213 /* 214 * Generic internet control operations (ioctl's). 215 * Ifp is 0 if not an interface-specific ioctl. 216 * 217 * NOTE! td might be NULL. 218 */ 219 int 220 in_control(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td) 221 { 222 struct netmsg_pru_control msg; 223 224 switch (cmd) { 225 /* change address */ 226 case SIOCALIFADDR: 227 case SIOCDLIFADDR: 228 case SIOCSIFDSTADDR: 229 case SIOCSIFBRDADDR: 230 case SIOCSIFADDR: 231 case SIOCSIFNETMASK: 232 case SIOCAIFADDR: 233 case SIOCDIFADDR: 234 /* 235 * Dispatch these SIOCs to netisr0. 236 */ 237 netmsg_init(&msg.base, NULL, &curthread->td_msgport, 0, 238 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 return msg.base.lmsg.ms_error; 245 246 default: 247 return in_control_internal(cmd, data, ifp, td); 248 } 249 } 250 251 static void 252 in_ialink_dispatch(netmsg_t msg) 253 { 254 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 255 struct ifaddr_container *ifac; 256 struct in_ifaddr_container *iac; 257 int cpu = mycpuid; 258 259 crit_enter(); 260 261 ifac = &ia->ia_ifa.ifa_containers[cpu]; 262 ASSERT_IFAC_VALID(ifac); 263 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD) == 0, 264 ("ia is on in_ifaddrheads")); 265 266 ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHEAD; 267 iac = &ifac->ifa_proto_u.u_in_ifac; 268 TAILQ_INSERT_TAIL(&in_ifaddrheads[cpu], iac, ia_link); 269 270 crit_exit(); 271 272 netisr_forwardmsg_all(&msg->base, cpu + 1); 273 } 274 275 static void 276 in_iaunlink_dispatch(netmsg_t msg) 277 { 278 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 279 struct ifaddr_container *ifac; 280 struct in_ifaddr_container *iac; 281 int cpu = mycpuid; 282 283 crit_enter(); 284 285 ifac = &ia->ia_ifa.ifa_containers[cpu]; 286 ASSERT_IFAC_VALID(ifac); 287 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD, 288 ("ia is not on in_ifaddrheads")); 289 290 iac = &ifac->ifa_proto_u.u_in_ifac; 291 TAILQ_REMOVE(&in_ifaddrheads[cpu], iac, ia_link); 292 ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHEAD; 293 294 crit_exit(); 295 296 netisr_forwardmsg_all(&msg->base, cpu + 1); 297 } 298 299 static void 300 in_iahashins_dispatch(netmsg_t msg) 301 { 302 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 303 struct ifaddr_container *ifac; 304 struct in_ifaddr_container *iac; 305 int cpu = mycpuid; 306 307 crit_enter(); 308 309 ifac = &ia->ia_ifa.ifa_containers[cpu]; 310 ASSERT_IFAC_VALID(ifac); 311 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0, 312 ("ia is on in_ifaddrhashtbls")); 313 314 ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHASH; 315 iac = &ifac->ifa_proto_u.u_in_ifac; 316 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 317 iac, ia_hash); 318 319 crit_exit(); 320 321 netisr_forwardmsg_all(&msg->base, cpu + 1); 322 } 323 324 static void 325 in_iahashrem_dispatch(netmsg_t msg) 326 { 327 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 328 struct ifaddr_container *ifac; 329 struct in_ifaddr_container *iac; 330 int cpu = mycpuid; 331 332 crit_enter(); 333 334 ifac = &ia->ia_ifa.ifa_containers[cpu]; 335 ASSERT_IFAC_VALID(ifac); 336 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH, 337 ("ia is not on in_ifaddrhashtbls")); 338 339 iac = &ifac->ifa_proto_u.u_in_ifac; 340 LIST_REMOVE(iac, ia_hash); 341 ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHASH; 342 343 crit_exit(); 344 345 netisr_forwardmsg_all(&msg->base, cpu + 1); 346 } 347 348 static void 349 in_ialink(struct in_ifaddr *ia) 350 { 351 struct netmsg_base msg; 352 353 netmsg_init(&msg, NULL, &curthread->td_msgport, 354 0, in_ialink_dispatch); 355 msg.lmsg.u.ms_resultp = ia; 356 357 netisr_domsg(&msg, 0); 358 } 359 360 void 361 in_iaunlink(struct in_ifaddr *ia) 362 { 363 struct netmsg_base msg; 364 365 netmsg_init(&msg, NULL, &curthread->td_msgport, 366 0, in_iaunlink_dispatch); 367 msg.lmsg.u.ms_resultp = ia; 368 369 netisr_domsg(&msg, 0); 370 } 371 372 void 373 in_iahash_insert(struct in_ifaddr *ia) 374 { 375 struct netmsg_base msg; 376 377 netmsg_init(&msg, NULL, &curthread->td_msgport, 378 0, in_iahashins_dispatch); 379 msg.lmsg.u.ms_resultp = ia; 380 381 netisr_domsg(&msg, 0); 382 } 383 384 void 385 in_iahash_remove(struct in_ifaddr *ia) 386 { 387 struct netmsg_base msg; 388 389 netmsg_init(&msg, NULL, &curthread->td_msgport, 390 0, in_iahashrem_dispatch); 391 msg.lmsg.u.ms_resultp = ia; 392 393 netisr_domsg(&msg, 0); 394 } 395 396 static __inline struct in_ifaddr * 397 in_ianext(struct in_ifaddr *oia) 398 { 399 struct ifaddr_container *ifac; 400 struct in_ifaddr_container *iac; 401 402 ifac = &oia->ia_ifa.ifa_containers[mycpuid]; 403 ASSERT_IFAC_VALID(ifac); 404 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD, 405 ("ia is not on in_ifaddrheads")); 406 407 iac = &ifac->ifa_proto_u.u_in_ifac; 408 iac = TAILQ_NEXT(iac, ia_link); 409 if (iac != NULL) 410 return iac->ia; 411 else 412 return NULL; 413 } 414 415 static int 416 in_control_internal(u_long cmd, caddr_t data, struct ifnet *ifp, 417 struct thread *td) 418 { 419 struct ifreq *ifr = (struct ifreq *)data; 420 struct in_ifaddr *ia = NULL; 421 struct in_addr dst; 422 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 423 struct ifaddr_container *ifac; 424 struct in_ifaddr_container *iac; 425 struct sockaddr_in oldaddr; 426 int hostIsNew, iaIsNew, maskIsNew, ifpWasUp; 427 int error = 0; 428 429 switch (cmd) { 430 case SIOCALIFADDR: 431 case SIOCDLIFADDR: 432 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 433 return error; 434 /* FALLTHROUGH */ 435 case SIOCGLIFADDR: 436 if (!ifp) 437 return EINVAL; 438 return in_lifaddr_ioctl(cmd, data, ifp, td); 439 } 440 441 iaIsNew = 0; 442 ifpWasUp = 0; 443 444 /* 445 * Find address for this interface, if it exists. 446 * 447 * If an alias address was specified, find that one instead of 448 * the first one on the interface, if possible 449 */ 450 if (ifp) { 451 struct in_ifaddr *iap; 452 453 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 454 LIST_FOREACH(iac, INADDR_HASH(dst.s_addr), ia_hash) { 455 iap = iac->ia; 456 if (iap->ia_ifp == ifp && 457 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 458 ia = iap; 459 break; 460 } 461 } 462 if (ia == NULL) { 463 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], 464 ifa_link) { 465 iap = ifatoia(ifac->ifa); 466 if (iap->ia_addr.sin_family == AF_INET) { 467 ia = iap; 468 break; 469 } 470 } 471 } 472 473 if (ifp->if_flags & IFF_UP) 474 ifpWasUp = 1; 475 } 476 477 switch (cmd) { 478 case SIOCAIFADDR: 479 case SIOCDIFADDR: 480 if (ifp == NULL) 481 return (EADDRNOTAVAIL); 482 if (ifra->ifra_addr.sin_family == AF_INET) { 483 while (ia != NULL) { 484 if (ia->ia_ifp == ifp && 485 ia->ia_addr.sin_addr.s_addr == 486 ifra->ifra_addr.sin_addr.s_addr) 487 break; 488 ia = in_ianext(ia); 489 } 490 if ((ifp->if_flags & IFF_POINTOPOINT) && 491 cmd == SIOCAIFADDR && 492 ifra->ifra_dstaddr.sin_addr.s_addr == INADDR_ANY) { 493 return EDESTADDRREQ; 494 } 495 } 496 if (cmd == SIOCDIFADDR && ia == NULL) 497 return (EADDRNOTAVAIL); 498 /* FALLTHROUGH */ 499 case SIOCSIFADDR: 500 case SIOCSIFNETMASK: 501 case SIOCSIFDSTADDR: 502 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 503 return error; 504 505 if (ifp == NULL) 506 return (EADDRNOTAVAIL); 507 508 if (cmd == SIOCSIFDSTADDR && 509 (ifp->if_flags & IFF_POINTOPOINT) == 0) 510 return (EINVAL); 511 512 if (ia == NULL) { 513 struct ifaddr *ifa; 514 int i; 515 516 ia = ifa_create(sizeof(*ia)); 517 ifa = &ia->ia_ifa; 518 519 /* 520 * Setup per-CPU information 521 */ 522 for (i = 0; i < ncpus; ++i) { 523 ifac = &ifa->ifa_containers[i]; 524 iac = &ifac->ifa_proto_u.u_in_ifac; 525 iac->ia = ia; 526 iac->ia_ifac = ifac; 527 } 528 529 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 530 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 531 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 532 ia->ia_sockmask.sin_len = 8; 533 ia->ia_sockmask.sin_family = AF_INET; 534 if (ifp->if_flags & IFF_BROADCAST) { 535 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr; 536 ia->ia_broadaddr.sin_family = AF_INET; 537 } 538 ia->ia_ifp = ifp; 539 iaIsNew = 1; 540 541 in_ialink(ia); 542 ifa_iflink(ifa, ifp, 1); 543 } 544 break; 545 546 case SIOCSIFBRDADDR: 547 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 548 return error; 549 /* FALLTHROUGH */ 550 551 case SIOCGIFADDR: 552 case SIOCGIFNETMASK: 553 case SIOCGIFDSTADDR: 554 case SIOCGIFBRDADDR: 555 if (ia == NULL) 556 return (EADDRNOTAVAIL); 557 break; 558 } 559 560 switch (cmd) { 561 case SIOCGIFADDR: 562 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 563 return (0); 564 565 case SIOCGIFBRDADDR: 566 if ((ifp->if_flags & IFF_BROADCAST) == 0) 567 return (EINVAL); 568 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 569 return (0); 570 571 case SIOCGIFDSTADDR: 572 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 573 return (EINVAL); 574 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 575 return (0); 576 577 case SIOCGIFNETMASK: 578 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 579 return (0); 580 581 case SIOCSIFDSTADDR: 582 KKASSERT(ifp->if_flags & IFF_POINTOPOINT); 583 584 oldaddr = ia->ia_dstaddr; 585 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 586 if (ifp->if_ioctl != NULL) { 587 ifnet_serialize_all(ifp); 588 error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia, 589 td->td_proc->p_ucred); 590 ifnet_deserialize_all(ifp); 591 if (error) { 592 ia->ia_dstaddr = oldaddr; 593 return (error); 594 } 595 } 596 if (ia->ia_flags & IFA_ROUTE) { 597 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 598 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 599 ia->ia_ifa.ifa_dstaddr = 600 (struct sockaddr *)&ia->ia_dstaddr; 601 rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP); 602 } 603 return (0); 604 605 case SIOCSIFBRDADDR: 606 if ((ifp->if_flags & IFF_BROADCAST) == 0) 607 return (EINVAL); 608 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 609 return (0); 610 611 case SIOCSIFADDR: 612 error = in_ifinit(ifp, ia, 613 (const struct sockaddr_in *)&ifr->ifr_addr, 1); 614 if (error != 0 && iaIsNew) 615 break; 616 if (error == 0) { 617 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 618 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 619 &ia->ia_ifa); 620 } 621 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) { 622 /* 623 * Interface is brought up by in_ifinit() 624 * (via ifp->if_ioctl). We act as if the 625 * interface got IFF_UP flag turned on. 626 */ 627 if_up(ifp); 628 } 629 return (0); 630 631 case SIOCSIFNETMASK: 632 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 633 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 634 return (0); 635 636 case SIOCAIFADDR: 637 maskIsNew = 0; 638 hostIsNew = 1; 639 error = 0; 640 if (ia->ia_addr.sin_family == AF_INET) { 641 if (ifra->ifra_addr.sin_len == 0) { 642 ifra->ifra_addr = ia->ia_addr; 643 hostIsNew = 0; 644 } else if (ifra->ifra_addr.sin_addr.s_addr == 645 ia->ia_addr.sin_addr.s_addr) { 646 hostIsNew = 0; 647 } 648 } 649 if (ifra->ifra_mask.sin_len) { 650 in_ifscrub(ifp, ia); 651 ia->ia_sockmask = ifra->ifra_mask; 652 ia->ia_sockmask.sin_family = AF_INET; 653 ia->ia_subnetmask = 654 ntohl(ia->ia_sockmask.sin_addr.s_addr); 655 maskIsNew = 1; 656 } 657 if ((ifp->if_flags & IFF_POINTOPOINT) && 658 ifra->ifra_dstaddr.sin_family == AF_INET) { 659 in_ifscrub(ifp, ia); 660 ia->ia_dstaddr = ifra->ifra_dstaddr; 661 maskIsNew = 1; /* We lie; but the effect's the same */ 662 } 663 if (ifra->ifra_addr.sin_family == AF_INET && 664 (hostIsNew || maskIsNew)) 665 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 666 667 if (error != 0 && iaIsNew) 668 break; 669 670 if ((ifp->if_flags & IFF_BROADCAST) && 671 ifra->ifra_broadaddr.sin_family == AF_INET) 672 ia->ia_broadaddr = ifra->ifra_broadaddr; 673 if (error == 0) { 674 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 675 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 676 &ia->ia_ifa); 677 } 678 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) { 679 /* See the comment in SIOCSIFADDR */ 680 if_up(ifp); 681 } 682 return (error); 683 684 case SIOCDIFADDR: 685 /* 686 * in_ifscrub kills the interface route. 687 */ 688 in_ifscrub(ifp, ia); 689 /* 690 * in_ifadown gets rid of all the rest of 691 * the routes. This is not quite the right 692 * thing to do, but at least if we are running 693 * a routing process they will come back. 694 */ 695 in_ifadown(&ia->ia_ifa, 1); 696 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE, 697 &ia->ia_ifa); 698 error = 0; 699 break; 700 701 default: 702 if (ifp == NULL || ifp->if_ioctl == NULL) 703 return (EOPNOTSUPP); 704 ifnet_serialize_all(ifp); 705 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred); 706 ifnet_deserialize_all(ifp); 707 return (error); 708 } 709 710 KKASSERT(cmd == SIOCDIFADDR || 711 ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && iaIsNew)); 712 713 ifa_ifunlink(&ia->ia_ifa, ifp); 714 in_iaunlink(ia); 715 716 if (cmd == SIOCDIFADDR) { 717 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 718 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) 719 in_iahash_remove(ia); 720 } 721 #ifdef INVARIANTS 722 else { 723 /* 724 * If cmd is SIOCSIFADDR or SIOCAIFADDR, in_ifinit() has 725 * already taken care of the deletion from hash table 726 */ 727 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 728 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0, 729 ("SIOC%cIFADDR failed on new ia, " 730 "but the new ia is still in hash table", 731 cmd == SIOCSIFADDR ? 'S' : 'A')); 732 } 733 #endif 734 735 ifa_destroy(&ia->ia_ifa); 736 737 if ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && 738 !ifpWasUp && (ifp->if_flags & IFF_UP)) { 739 /* 740 * Though the address assignment failed, the 741 * interface is brought up by in_ifinit() 742 * (via ifp->if_ioctl). With the hope that 743 * the interface has some valid addresses, we 744 * act as if IFF_UP flag was just set on the 745 * interface. 746 * 747 * NOTE: 748 * This could only be done after the failed 749 * address is unlinked from the global address 750 * list. 751 */ 752 if_up(ifp); 753 } 754 755 return (error); 756 } 757 758 /* 759 * SIOC[GAD]LIFADDR. 760 * SIOCGLIFADDR: get first address. (?!?) 761 * SIOCGLIFADDR with IFLR_PREFIX: 762 * get first address that matches the specified prefix. 763 * SIOCALIFADDR: add the specified address. 764 * SIOCALIFADDR with IFLR_PREFIX: 765 * EINVAL since we can't deduce hostid part of the address. 766 * SIOCDLIFADDR: delete the specified address. 767 * SIOCDLIFADDR with IFLR_PREFIX: 768 * delete the first address that matches the specified prefix. 769 * return values: 770 * EINVAL on invalid parameters 771 * EADDRNOTAVAIL on prefix match failed/specified address not found 772 * other values may be returned from in_ioctl() 773 * 774 * NOTE! td might be NULL. 775 */ 776 static int 777 in_lifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td) 778 { 779 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 780 781 /* sanity checks */ 782 if (!data || !ifp) { 783 panic("invalid argument to in_lifaddr_ioctl"); 784 /*NOTRECHED*/ 785 } 786 787 switch (cmd) { 788 case SIOCGLIFADDR: 789 /* address must be specified on GET with IFLR_PREFIX */ 790 if ((iflr->flags & IFLR_PREFIX) == 0) 791 break; 792 /*FALLTHROUGH*/ 793 case SIOCALIFADDR: 794 case SIOCDLIFADDR: 795 /* address must be specified on ADD and DELETE */ 796 if (iflr->addr.ss_family != AF_INET) 797 return EINVAL; 798 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 799 return EINVAL; 800 /* XXX need improvement */ 801 if (iflr->dstaddr.ss_family 802 && iflr->dstaddr.ss_family != AF_INET) 803 return EINVAL; 804 if (iflr->dstaddr.ss_family 805 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 806 return EINVAL; 807 break; 808 default: /*shouldn't happen*/ 809 return EOPNOTSUPP; 810 } 811 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 812 return EINVAL; 813 814 switch (cmd) { 815 case SIOCALIFADDR: 816 { 817 struct in_aliasreq ifra; 818 819 if (iflr->flags & IFLR_PREFIX) 820 return EINVAL; 821 822 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 823 bzero(&ifra, sizeof ifra); 824 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name); 825 826 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 827 828 if (iflr->dstaddr.ss_family) { /*XXX*/ 829 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 830 iflr->dstaddr.ss_len); 831 } 832 833 ifra.ifra_mask.sin_family = AF_INET; 834 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 835 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 836 837 return in_control_internal(SIOCAIFADDR, (caddr_t)&ifra, ifp, 838 td); 839 } 840 case SIOCGLIFADDR: 841 case SIOCDLIFADDR: 842 { 843 struct ifaddr_container *ifac; 844 struct in_ifaddr *ia; 845 struct in_addr mask, candidate, match; 846 struct sockaddr_in *sin; 847 int cmp; 848 849 bzero(&mask, sizeof mask); 850 if (iflr->flags & IFLR_PREFIX) { 851 /* lookup a prefix rather than address. */ 852 in_len2mask(&mask, iflr->prefixlen); 853 854 sin = (struct sockaddr_in *)&iflr->addr; 855 match.s_addr = sin->sin_addr.s_addr; 856 match.s_addr &= mask.s_addr; 857 858 /* if you set extra bits, that's wrong */ 859 if (match.s_addr != sin->sin_addr.s_addr) 860 return EINVAL; 861 862 cmp = 1; 863 } else { 864 if (cmd == SIOCGLIFADDR) { 865 /* on getting an address, take the 1st match */ 866 match.s_addr = 0; /* gcc4 warning */ 867 cmp = 0; /*XXX*/ 868 } else { 869 /* on deleting an address, do exact match */ 870 in_len2mask(&mask, 32); 871 sin = (struct sockaddr_in *)&iflr->addr; 872 match.s_addr = sin->sin_addr.s_addr; 873 874 cmp = 1; 875 } 876 } 877 878 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 879 struct ifaddr *ifa = ifac->ifa; 880 881 if (ifa->ifa_addr->sa_family != AF_INET6) 882 continue; 883 if (!cmp) 884 break; 885 candidate.s_addr = 886 ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 887 candidate.s_addr &= mask.s_addr; 888 if (candidate.s_addr == match.s_addr) 889 break; 890 } 891 if (ifac == NULL) 892 return EADDRNOTAVAIL; 893 ia = (struct in_ifaddr *)(ifac->ifa); 894 895 if (cmd == SIOCGLIFADDR) { 896 /* fill in the if_laddrreq structure */ 897 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 898 899 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 900 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 901 ia->ia_dstaddr.sin_len); 902 } else 903 bzero(&iflr->dstaddr, sizeof iflr->dstaddr); 904 905 iflr->prefixlen = 906 in_mask2len(&ia->ia_sockmask.sin_addr); 907 908 iflr->flags = 0; /*XXX*/ 909 910 return 0; 911 } else { 912 struct in_aliasreq ifra; 913 914 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 915 bzero(&ifra, sizeof ifra); 916 bcopy(iflr->iflr_name, ifra.ifra_name, 917 sizeof ifra.ifra_name); 918 919 bcopy(&ia->ia_addr, &ifra.ifra_addr, 920 ia->ia_addr.sin_len); 921 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 922 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 923 ia->ia_dstaddr.sin_len); 924 } 925 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 926 ia->ia_sockmask.sin_len); 927 928 return in_control_internal(SIOCDIFADDR, (caddr_t)&ifra, 929 ifp, td); 930 } 931 } 932 } 933 934 return EOPNOTSUPP; /*just for safety*/ 935 } 936 937 /* 938 * Delete any existing route for an interface. 939 */ 940 void 941 in_ifscrub(struct ifnet *ifp __unused, struct in_ifaddr *ia) 942 { 943 in_scrubprefix(ia); 944 } 945 946 /* 947 * Initialize an interface's internet address 948 * and routing table entry. 949 */ 950 static int 951 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, 952 const struct sockaddr_in *sin, int scrub) 953 { 954 u_long i = ntohl(sin->sin_addr.s_addr); 955 struct sockaddr_in oldaddr; 956 struct ifaddr_container *ifac; 957 int flags = RTF_UP, error = 0; 958 int was_hash = 0; 959 960 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 961 oldaddr = ia->ia_addr; 962 963 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) { 964 was_hash = 1; 965 in_iahash_remove(ia); 966 } 967 968 ia->ia_addr = *sin; 969 if (ia->ia_addr.sin_family == AF_INET) 970 in_iahash_insert(ia); 971 972 /* 973 * Give the interface a chance to initialize 974 * if this is its first address, 975 * and to validate the address if necessary. 976 */ 977 if (ifp->if_ioctl != NULL) { 978 ifnet_serialize_all(ifp); 979 error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL); 980 ifnet_deserialize_all(ifp); 981 if (error) 982 goto fail; 983 } 984 985 /* 986 * Delete old route, if requested. 987 */ 988 if (scrub) { 989 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 990 in_ifscrub(ifp, ia); 991 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 992 } 993 994 /* 995 * Calculate netmask/subnetmask. 996 */ 997 if (IN_CLASSA(i)) 998 ia->ia_netmask = IN_CLASSA_NET; 999 else if (IN_CLASSB(i)) 1000 ia->ia_netmask = IN_CLASSB_NET; 1001 else 1002 ia->ia_netmask = IN_CLASSC_NET; 1003 /* 1004 * The subnet mask usually includes at least the standard network part, 1005 * but may may be smaller in the case of supernetting. 1006 * If it is set, we believe it. 1007 */ 1008 if (ia->ia_subnetmask == 0) { 1009 ia->ia_subnetmask = ia->ia_netmask; 1010 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 1011 } else { 1012 ia->ia_netmask &= ia->ia_subnetmask; 1013 } 1014 ia->ia_net = i & ia->ia_netmask; 1015 ia->ia_subnet = i & ia->ia_subnetmask; 1016 in_socktrim(&ia->ia_sockmask); 1017 1018 /* 1019 * Add route for the network. 1020 */ 1021 ia->ia_ifa.ifa_metric = ifp->if_metric; 1022 if (ifp->if_flags & IFF_BROADCAST) { 1023 ia->ia_broadaddr.sin_addr.s_addr = 1024 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 1025 ia->ia_netbroadcast.s_addr = 1026 htonl(ia->ia_net | ~ ia->ia_netmask); 1027 } else if (ifp->if_flags & IFF_LOOPBACK) { 1028 ia->ia_dstaddr = ia->ia_addr; 1029 flags |= RTF_HOST; 1030 } else if (ifp->if_flags & IFF_POINTOPOINT) { 1031 if (ia->ia_dstaddr.sin_family != AF_INET) 1032 return (0); 1033 flags |= RTF_HOST; 1034 } 1035 1036 /*- 1037 * Don't add host routes for interface addresses of 1038 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it 1039 * possible to assign several such address pairs with consistent 1040 * results (no host route) and is required by BOOTP. 1041 * 1042 * XXX: This is ugly ! There should be a way for the caller to 1043 * say that they don't want a host route. 1044 */ 1045 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY || 1046 ia->ia_netmask != IN_CLASSA_NET || 1047 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) { 1048 error = in_addprefix(ia, flags); 1049 if (error) 1050 goto fail; 1051 } 1052 1053 /* 1054 * If the interface supports multicast, join the "all hosts" 1055 * multicast group on that interface. 1056 */ 1057 if (ifp->if_flags & IFF_MULTICAST) { 1058 struct in_addr addr; 1059 1060 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 1061 in_addmulti(&addr, ifp); 1062 } 1063 return (0); 1064 fail: 1065 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) 1066 in_iahash_remove(ia); 1067 1068 ia->ia_addr = oldaddr; 1069 if (was_hash) 1070 in_iahash_insert(ia); 1071 return (error); 1072 } 1073 1074 #define rtinitflags(x) \ 1075 (((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) \ 1076 ? RTF_HOST : 0) 1077 1078 /* 1079 * Add a route to prefix ("connected route" in cisco terminology). 1080 * Do nothing, if there are some interface addresses with the same 1081 * prefix already. This function assumes that the 'target' parent 1082 * interface is UP. 1083 */ 1084 static int 1085 in_addprefix(struct in_ifaddr *target, int flags) 1086 { 1087 struct in_ifaddr_container *iac; 1088 struct in_addr prefix, mask; 1089 int error; 1090 1091 #ifdef CARP 1092 /* 1093 * Don't add prefix routes for CARP interfaces. 1094 * Prefix routes creation is handled by CARP 1095 * interfaces themselves. 1096 */ 1097 if (target->ia_ifp->if_type == IFT_CARP) 1098 return 0; 1099 #endif 1100 1101 mask = target->ia_sockmask.sin_addr; 1102 if (flags & RTF_HOST) { 1103 prefix = target->ia_dstaddr.sin_addr; 1104 } else { 1105 prefix = target->ia_addr.sin_addr; 1106 prefix.s_addr &= mask.s_addr; 1107 } 1108 1109 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 1110 struct in_ifaddr *ia = iac->ia; 1111 struct in_addr p; 1112 1113 /* Don't test against self */ 1114 if (ia == target) 1115 continue; 1116 1117 /* The tested address does not own a route entry */ 1118 if ((ia->ia_flags & IFA_ROUTE) == 0) 1119 continue; 1120 1121 /* Prefix test */ 1122 if (rtinitflags(ia)) { 1123 p = ia->ia_dstaddr.sin_addr; 1124 } else { 1125 p = ia->ia_addr.sin_addr; 1126 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1127 } 1128 if (prefix.s_addr != p.s_addr) 1129 continue; 1130 1131 /* 1132 * If the to-be-added address and the curretly being 1133 * tested address are not host addresses, we need to 1134 * take subnetmask into consideration. 1135 */ 1136 if (!(flags & RTF_HOST) && !rtinitflags(ia) && 1137 mask.s_addr != ia->ia_sockmask.sin_addr.s_addr) 1138 continue; 1139 1140 /* 1141 * If we got a matching prefix route inserted by other 1142 * interface address, we don't need to bother. 1143 */ 1144 return 0; 1145 } 1146 1147 /* 1148 * No one seem to have prefix route; insert it. 1149 */ 1150 error = rtinit(&target->ia_ifa, RTM_ADD, flags); 1151 if (!error) 1152 target->ia_flags |= IFA_ROUTE; 1153 return error; 1154 } 1155 1156 /* 1157 * Remove a route to prefix ("connected route" in cisco terminology). 1158 * Re-installs the route by using another interface address, if there's 1159 * one with the same prefix (otherwise we lose the route mistakenly). 1160 */ 1161 static void 1162 in_scrubprefix(struct in_ifaddr *target) 1163 { 1164 struct in_ifaddr_container *iac; 1165 struct in_addr prefix, mask; 1166 int error; 1167 1168 #ifdef CARP 1169 /* 1170 * Don't scrub prefix routes for CARP interfaces. 1171 * Prefix routes deletion is handled by CARP 1172 * interfaces themselves. 1173 */ 1174 if (target->ia_ifp->if_type == IFT_CARP) 1175 return; 1176 #endif 1177 1178 if ((target->ia_flags & IFA_ROUTE) == 0) 1179 return; 1180 1181 mask = target->ia_sockmask.sin_addr; 1182 if (rtinitflags(target)) { 1183 prefix = target->ia_dstaddr.sin_addr; 1184 } else { 1185 prefix = target->ia_addr.sin_addr; 1186 prefix.s_addr &= mask.s_addr; 1187 } 1188 1189 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 1190 struct in_ifaddr *ia = iac->ia; 1191 struct in_addr p; 1192 1193 /* Don't test against self */ 1194 if (ia == target) 1195 continue; 1196 1197 /* The tested address already owns a route entry */ 1198 if (ia->ia_flags & IFA_ROUTE) 1199 continue; 1200 1201 /* 1202 * The prefix route of the tested address should 1203 * never be installed if its parent interface is 1204 * not UP yet. 1205 */ 1206 if ((ia->ia_ifp->if_flags & IFF_UP) == 0) 1207 continue; 1208 1209 #ifdef CARP 1210 /* 1211 * Don't add prefix routes for CARP interfaces. 1212 * Prefix routes creation is handled by CARP 1213 * interfaces themselves. 1214 */ 1215 if (ia->ia_ifp->if_type == IFT_CARP) 1216 continue; 1217 #endif 1218 1219 /* Prefix test */ 1220 if (rtinitflags(ia)) { 1221 p = ia->ia_dstaddr.sin_addr; 1222 } else { 1223 p = ia->ia_addr.sin_addr; 1224 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1225 } 1226 if (prefix.s_addr != p.s_addr) 1227 continue; 1228 1229 /* 1230 * We don't need to test subnetmask here, as what we do 1231 * in in_addprefix(), since if the the tested address's 1232 * parent interface is UP, the tested address should own 1233 * a prefix route entry and we would never reach here. 1234 */ 1235 1236 /* 1237 * If we got a matching prefix route, move IFA_ROUTE to him 1238 */ 1239 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target)); 1240 target->ia_flags &= ~IFA_ROUTE; 1241 1242 error = rtinit(&ia->ia_ifa, RTM_ADD, rtinitflags(ia) | RTF_UP); 1243 if (!error) 1244 ia->ia_flags |= IFA_ROUTE; 1245 return; 1246 } 1247 1248 /* 1249 * No candidates for this prefix route; just remove it. 1250 */ 1251 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target)); 1252 target->ia_flags &= ~IFA_ROUTE; 1253 } 1254 1255 #undef rtinitflags 1256 1257 /* 1258 * Return 1 if the address might be a local broadcast address. 1259 */ 1260 int 1261 in_broadcast(struct in_addr in, struct ifnet *ifp) 1262 { 1263 struct ifaddr_container *ifac; 1264 u_long t; 1265 1266 if (in.s_addr == INADDR_BROADCAST || 1267 in.s_addr == INADDR_ANY) 1268 return 1; 1269 if (ifp == NULL || (ifp->if_flags & IFF_BROADCAST) == 0) 1270 return 0; 1271 t = ntohl(in.s_addr); 1272 /* 1273 * Look through the list of addresses for a match 1274 * with a broadcast address. 1275 */ 1276 #define ia ((struct in_ifaddr *)ifa) 1277 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1278 struct ifaddr *ifa = ifac->ifa; 1279 1280 if (ifa->ifa_addr->sa_family == AF_INET && 1281 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1282 in.s_addr == ia->ia_netbroadcast.s_addr || 1283 /* 1284 * Check for old-style (host 0) broadcast. 1285 */ 1286 t == ia->ia_subnet || t == ia->ia_net) && 1287 /* 1288 * Check for an all one subnetmask. These 1289 * only exist when an interface gets a secondary 1290 * address. 1291 */ 1292 ia->ia_subnetmask != (u_long)0xffffffff) 1293 return 1; 1294 } 1295 return (0); 1296 #undef ia 1297 } 1298 1299 /* 1300 * Add an address to the list of IP multicast addresses for a given interface. 1301 */ 1302 struct in_multi * 1303 in_addmulti(struct in_addr *ap, struct ifnet *ifp) 1304 { 1305 struct in_multi *inm; 1306 int error; 1307 struct sockaddr_in sin; 1308 struct ifmultiaddr *ifma; 1309 1310 ASSERT_NETISR0; 1311 1312 /* 1313 * Call generic routine to add membership or increment 1314 * refcount. It wants addresses in the form of a sockaddr, 1315 * so we build one here (being careful to zero the unused bytes). 1316 */ 1317 bzero(&sin, sizeof sin); 1318 sin.sin_family = AF_INET; 1319 sin.sin_len = sizeof sin; 1320 sin.sin_addr = *ap; 1321 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 1322 if (error) 1323 return NULL; 1324 1325 /* 1326 * If ifma->ifma_protospec is null, then if_addmulti() created 1327 * a new record. Otherwise, we are done. 1328 */ 1329 if (ifma->ifma_protospec != NULL) 1330 return ifma->ifma_protospec; 1331 1332 inm = kmalloc(sizeof *inm, M_IPMADDR, M_INTWAIT | M_ZERO); 1333 inm->inm_addr = *ap; 1334 inm->inm_ifp = ifp; 1335 inm->inm_ifma = ifma; 1336 ifma->ifma_protospec = inm; 1337 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 1338 1339 /* 1340 * Let IGMP know that we have joined a new IP multicast group. 1341 */ 1342 igmp_joingroup(inm); 1343 return inm; 1344 } 1345 1346 /* 1347 * Delete a multicast address record. 1348 */ 1349 void 1350 in_delmulti(struct in_multi *inm) 1351 { 1352 struct ifmultiaddr *ifma; 1353 struct in_multi my_inm; 1354 1355 ASSERT_NETISR0; 1356 1357 ifma = inm->inm_ifma; 1358 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 1359 if (ifma->ifma_refcount == 1) { 1360 /* 1361 * No remaining claims to this record; let IGMP know that 1362 * we are leaving the multicast group. 1363 * But do it after the if_delmulti() which might reset 1364 * the interface and nuke the packet. 1365 */ 1366 my_inm = *inm ; 1367 ifma->ifma_protospec = NULL; 1368 LIST_REMOVE(inm, inm_link); 1369 kfree(inm, M_IPMADDR); 1370 } 1371 /* XXX - should be separate API for when we have an ifma? */ 1372 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1373 if (my_inm.inm_ifp != NULL) 1374 igmp_leavegroup(&my_inm); 1375 } 1376 1377 static void 1378 in_ifdetach_dispatch(netmsg_t nmsg) 1379 { 1380 struct lwkt_msg *lmsg = &nmsg->lmsg; 1381 struct ifnet *ifp = lmsg->u.ms_resultp; 1382 int cpu; 1383 1384 in_pcbpurgeif0(&ripcbinfo, ifp); 1385 for (cpu = 0; cpu < netisr_ncpus; ++cpu) 1386 in_pcbpurgeif0(&udbinfo[cpu], ifp); 1387 1388 lwkt_replymsg(lmsg, 0); 1389 } 1390 1391 void 1392 in_ifdetach(struct ifnet *ifp) 1393 { 1394 struct netmsg_base nmsg; 1395 struct lwkt_msg *lmsg = &nmsg.lmsg; 1396 1397 netmsg_init(&nmsg, NULL, &curthread->td_msgport, 0, 1398 in_ifdetach_dispatch); 1399 lmsg->u.ms_resultp = ifp; 1400 1401 lwkt_domsg(netisr_cpuport(0), lmsg, 0); 1402 } 1403