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 case SIOCGIFALIAS: 235 /* 236 * Dispatch these SIOCs to netisr0. 237 */ 238 netmsg_init(&msg.base, NULL, &curthread->td_msgport, 0, 239 in_control_internal_dispatch); 240 msg.nm_cmd = cmd; 241 msg.nm_data = data; 242 msg.nm_ifp = ifp; 243 msg.nm_td = td; 244 lwkt_domsg(netisr_cpuport(0), &msg.base.lmsg, 0); 245 return msg.base.lmsg.ms_error; 246 247 default: 248 return in_control_internal(cmd, data, ifp, td); 249 } 250 } 251 252 static void 253 in_ialink_dispatch(netmsg_t msg) 254 { 255 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 256 struct ifaddr_container *ifac; 257 struct in_ifaddr_container *iac; 258 int cpu = mycpuid; 259 260 crit_enter(); 261 262 ifac = &ia->ia_ifa.ifa_containers[cpu]; 263 ASSERT_IFAC_VALID(ifac); 264 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD) == 0, 265 ("ia is on in_ifaddrheads")); 266 267 ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHEAD; 268 iac = &ifac->ifa_proto_u.u_in_ifac; 269 TAILQ_INSERT_TAIL(&in_ifaddrheads[cpu], iac, ia_link); 270 271 crit_exit(); 272 273 netisr_forwardmsg_all(&msg->base, cpu + 1); 274 } 275 276 static void 277 in_iaunlink_dispatch(netmsg_t msg) 278 { 279 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 280 struct ifaddr_container *ifac; 281 struct in_ifaddr_container *iac; 282 int cpu = mycpuid; 283 284 crit_enter(); 285 286 ifac = &ia->ia_ifa.ifa_containers[cpu]; 287 ASSERT_IFAC_VALID(ifac); 288 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD, 289 ("ia is not on in_ifaddrheads")); 290 291 iac = &ifac->ifa_proto_u.u_in_ifac; 292 TAILQ_REMOVE(&in_ifaddrheads[cpu], iac, ia_link); 293 ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHEAD; 294 295 crit_exit(); 296 297 netisr_forwardmsg_all(&msg->base, cpu + 1); 298 } 299 300 static void 301 in_iahashins_dispatch(netmsg_t msg) 302 { 303 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 304 struct ifaddr_container *ifac; 305 struct in_ifaddr_container *iac; 306 int cpu = mycpuid; 307 308 crit_enter(); 309 310 ifac = &ia->ia_ifa.ifa_containers[cpu]; 311 ASSERT_IFAC_VALID(ifac); 312 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0, 313 ("ia is on in_ifaddrhashtbls")); 314 315 ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHASH; 316 iac = &ifac->ifa_proto_u.u_in_ifac; 317 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 318 iac, ia_hash); 319 320 crit_exit(); 321 322 netisr_forwardmsg_all(&msg->base, cpu + 1); 323 } 324 325 static void 326 in_iahashrem_dispatch(netmsg_t msg) 327 { 328 struct in_ifaddr *ia = msg->lmsg.u.ms_resultp; 329 struct ifaddr_container *ifac; 330 struct in_ifaddr_container *iac; 331 int cpu = mycpuid; 332 333 crit_enter(); 334 335 ifac = &ia->ia_ifa.ifa_containers[cpu]; 336 ASSERT_IFAC_VALID(ifac); 337 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH, 338 ("ia is not on in_ifaddrhashtbls")); 339 340 iac = &ifac->ifa_proto_u.u_in_ifac; 341 LIST_REMOVE(iac, ia_hash); 342 ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHASH; 343 344 crit_exit(); 345 346 netisr_forwardmsg_all(&msg->base, cpu + 1); 347 } 348 349 static void 350 in_ialink(struct in_ifaddr *ia) 351 { 352 struct netmsg_base msg; 353 354 netmsg_init(&msg, NULL, &curthread->td_msgport, 355 0, in_ialink_dispatch); 356 msg.lmsg.u.ms_resultp = ia; 357 358 netisr_domsg(&msg, 0); 359 } 360 361 void 362 in_iaunlink(struct in_ifaddr *ia) 363 { 364 struct netmsg_base msg; 365 366 netmsg_init(&msg, NULL, &curthread->td_msgport, 367 0, in_iaunlink_dispatch); 368 msg.lmsg.u.ms_resultp = ia; 369 370 netisr_domsg(&msg, 0); 371 } 372 373 void 374 in_iahash_insert(struct in_ifaddr *ia) 375 { 376 struct netmsg_base msg; 377 378 netmsg_init(&msg, NULL, &curthread->td_msgport, 379 0, in_iahashins_dispatch); 380 msg.lmsg.u.ms_resultp = ia; 381 382 netisr_domsg(&msg, 0); 383 } 384 385 void 386 in_iahash_remove(struct in_ifaddr *ia) 387 { 388 struct netmsg_base msg; 389 390 netmsg_init(&msg, NULL, &curthread->td_msgport, 391 0, in_iahashrem_dispatch); 392 msg.lmsg.u.ms_resultp = ia; 393 394 netisr_domsg(&msg, 0); 395 } 396 397 static __inline struct in_ifaddr * 398 in_ianext(struct in_ifaddr *oia) 399 { 400 struct ifaddr_container *ifac; 401 struct in_ifaddr_container *iac; 402 403 ifac = &oia->ia_ifa.ifa_containers[mycpuid]; 404 ASSERT_IFAC_VALID(ifac); 405 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD, 406 ("ia is not on in_ifaddrheads")); 407 408 iac = &ifac->ifa_proto_u.u_in_ifac; 409 iac = TAILQ_NEXT(iac, ia_link); 410 if (iac != NULL) 411 return iac->ia; 412 else 413 return NULL; 414 } 415 416 static int 417 in_control_internal(u_long cmd, caddr_t data, struct ifnet *ifp, 418 struct thread *td) 419 { 420 struct ifreq *ifr = (struct ifreq *)data; 421 struct in_ifaddr *ia = NULL; 422 struct in_addr dst; 423 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 424 struct ifaddr_container *ifac; 425 struct in_ifaddr_container *iac; 426 struct sockaddr_in oldaddr; 427 int hostIsNew, iaIsNew, maskIsNew, ifpWasUp; 428 int error = 0; 429 430 switch (cmd) { 431 case SIOCALIFADDR: 432 case SIOCDLIFADDR: 433 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 434 return error; 435 /* FALLTHROUGH */ 436 case SIOCGLIFADDR: 437 if (!ifp) 438 return EINVAL; 439 return in_lifaddr_ioctl(cmd, data, ifp, td); 440 } 441 442 iaIsNew = 0; 443 ifpWasUp = 0; 444 445 /* 446 * Find address for this interface, if it exists. 447 * 448 * If an alias address was specified, find that one instead of 449 * the first one on the interface, if possible 450 */ 451 if (ifp) { 452 struct in_ifaddr *iap; 453 454 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 455 LIST_FOREACH(iac, INADDR_HASH(dst.s_addr), ia_hash) { 456 iap = iac->ia; 457 if (iap->ia_ifp == ifp && 458 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 459 ia = iap; 460 break; 461 } 462 } 463 if (ia == NULL) { 464 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], 465 ifa_link) { 466 iap = ifatoia(ifac->ifa); 467 if (iap->ia_addr.sin_family == AF_INET) { 468 ia = iap; 469 break; 470 } 471 } 472 } 473 474 if (ifp->if_flags & IFF_UP) 475 ifpWasUp = 1; 476 } 477 478 switch (cmd) { 479 case SIOCAIFADDR: 480 case SIOCDIFADDR: 481 case SIOCGIFALIAS: 482 if (ifp == NULL) 483 return (EADDRNOTAVAIL); 484 if (ifra->ifra_addr.sin_family == AF_INET) { 485 while (ia != NULL) { 486 if (ia->ia_ifp == ifp && 487 ia->ia_addr.sin_addr.s_addr == 488 ifra->ifra_addr.sin_addr.s_addr) 489 break; 490 ia = in_ianext(ia); 491 } 492 if ((ifp->if_flags & IFF_POINTOPOINT) && 493 cmd == SIOCAIFADDR && 494 ifra->ifra_dstaddr.sin_addr.s_addr == INADDR_ANY) { 495 return EDESTADDRREQ; 496 } 497 } 498 if ((cmd == SIOCDIFADDR || cmd == SIOCGIFALIAS) && ia == NULL) 499 return (EADDRNOTAVAIL); 500 if (cmd == SIOCGIFALIAS) 501 break; 502 /* FALLTHROUGH */ 503 case SIOCSIFADDR: 504 case SIOCSIFNETMASK: 505 case SIOCSIFDSTADDR: 506 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 507 return error; 508 509 if (ifp == NULL) 510 return (EADDRNOTAVAIL); 511 512 if (cmd == SIOCSIFDSTADDR && 513 (ifp->if_flags & IFF_POINTOPOINT) == 0) 514 return (EINVAL); 515 516 if (ia == NULL) { 517 struct ifaddr *ifa; 518 int i; 519 520 ia = ifa_create(sizeof(*ia)); 521 ifa = &ia->ia_ifa; 522 523 /* 524 * Setup per-CPU information 525 */ 526 for (i = 0; i < ncpus; ++i) { 527 ifac = &ifa->ifa_containers[i]; 528 iac = &ifac->ifa_proto_u.u_in_ifac; 529 iac->ia = ia; 530 iac->ia_ifac = ifac; 531 } 532 533 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 534 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 535 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 536 ia->ia_sockmask.sin_len = 8; 537 ia->ia_sockmask.sin_family = AF_INET; 538 if (ifp->if_flags & IFF_BROADCAST) { 539 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr; 540 ia->ia_broadaddr.sin_family = AF_INET; 541 } 542 ia->ia_ifp = ifp; 543 iaIsNew = 1; 544 545 in_ialink(ia); 546 ifa_iflink(ifa, ifp, 1); 547 } 548 break; 549 550 case SIOCSIFBRDADDR: 551 if (td && (error = priv_check(td, PRIV_ROOT)) != 0) 552 return error; 553 /* FALLTHROUGH */ 554 555 case SIOCGIFADDR: 556 case SIOCGIFNETMASK: 557 case SIOCGIFDSTADDR: 558 case SIOCGIFBRDADDR: 559 if (ia == NULL) 560 return (EADDRNOTAVAIL); 561 break; 562 } 563 564 switch (cmd) { 565 case SIOCGIFADDR: 566 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 567 return (0); 568 569 case SIOCGIFBRDADDR: 570 if ((ifp->if_flags & IFF_BROADCAST) == 0) 571 return (EINVAL); 572 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 573 return (0); 574 575 case SIOCGIFDSTADDR: 576 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 577 return (EINVAL); 578 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 579 return (0); 580 581 case SIOCGIFNETMASK: 582 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 583 return (0); 584 585 case SIOCSIFDSTADDR: 586 KKASSERT(ifp->if_flags & IFF_POINTOPOINT); 587 588 oldaddr = ia->ia_dstaddr; 589 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 590 if (ifp->if_ioctl != NULL) { 591 ifnet_serialize_all(ifp); 592 error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia, 593 td->td_proc->p_ucred); 594 ifnet_deserialize_all(ifp); 595 if (error) { 596 ia->ia_dstaddr = oldaddr; 597 return (error); 598 } 599 } 600 if (ia->ia_flags & IFA_ROUTE) { 601 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 602 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 603 ia->ia_ifa.ifa_dstaddr = 604 (struct sockaddr *)&ia->ia_dstaddr; 605 rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP); 606 } 607 return (0); 608 609 case SIOCSIFBRDADDR: 610 if ((ifp->if_flags & IFF_BROADCAST) == 0) 611 return (EINVAL); 612 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 613 return (0); 614 615 case SIOCSIFADDR: 616 error = in_ifinit(ifp, ia, 617 (const struct sockaddr_in *)&ifr->ifr_addr, 1); 618 if (error != 0 && iaIsNew) 619 break; 620 if (error == 0) { 621 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 622 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 623 &ia->ia_ifa); 624 } 625 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) { 626 /* 627 * Interface is brought up by in_ifinit() 628 * (via ifp->if_ioctl). We act as if the 629 * interface got IFF_UP flag turned on. 630 */ 631 if_up(ifp); 632 } 633 return (0); 634 635 case SIOCSIFNETMASK: 636 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 637 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 638 return (0); 639 640 case SIOCAIFADDR: 641 maskIsNew = 0; 642 hostIsNew = 1; 643 error = 0; 644 if (ia->ia_addr.sin_family == AF_INET) { 645 if (ifra->ifra_addr.sin_len == 0) { 646 ifra->ifra_addr = ia->ia_addr; 647 hostIsNew = 0; 648 } else if (ifra->ifra_addr.sin_addr.s_addr == 649 ia->ia_addr.sin_addr.s_addr) { 650 hostIsNew = 0; 651 } 652 } 653 if (ifra->ifra_mask.sin_len) { 654 in_ifscrub(ifp, ia); 655 ia->ia_sockmask = ifra->ifra_mask; 656 ia->ia_sockmask.sin_family = AF_INET; 657 ia->ia_subnetmask = 658 ntohl(ia->ia_sockmask.sin_addr.s_addr); 659 maskIsNew = 1; 660 } 661 if ((ifp->if_flags & IFF_POINTOPOINT) && 662 ifra->ifra_dstaddr.sin_family == AF_INET) { 663 in_ifscrub(ifp, ia); 664 ia->ia_dstaddr = ifra->ifra_dstaddr; 665 maskIsNew = 1; /* We lie; but the effect's the same */ 666 } 667 if (ifra->ifra_addr.sin_family == AF_INET && 668 (hostIsNew || maskIsNew)) 669 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 670 671 if (error != 0 && iaIsNew) 672 break; 673 674 if ((ifp->if_flags & IFF_BROADCAST) && 675 ifra->ifra_broadaddr.sin_family == AF_INET) 676 ia->ia_broadaddr = ifra->ifra_broadaddr; 677 if (error == 0) { 678 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 679 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 680 &ia->ia_ifa); 681 } 682 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) { 683 /* See the comment in SIOCSIFADDR */ 684 if_up(ifp); 685 } 686 return (error); 687 688 case SIOCGIFALIAS: 689 ifra->ifra_mask = ia->ia_sockmask; 690 if ((ifp->if_flags & IFF_POINTOPOINT) && 691 (ia->ia_dstaddr.sin_family == AF_INET)) 692 ifra->ifra_dstaddr = ia->ia_dstaddr; 693 else if ((ifp->if_flags & IFF_BROADCAST) && 694 (ia->ia_broadaddr.sin_family == AF_INET)) 695 ifra->ifra_broadaddr = ia->ia_broadaddr; 696 else 697 memset(&ifra->ifra_broadaddr, 0, 698 sizeof(ifra->ifra_broadaddr)); 699 return (0); 700 701 case SIOCDIFADDR: 702 /* 703 * in_ifscrub kills the interface route. 704 */ 705 in_ifscrub(ifp, ia); 706 /* 707 * in_ifadown gets rid of all the rest of 708 * the routes. This is not quite the right 709 * thing to do, but at least if we are running 710 * a routing process they will come back. 711 */ 712 in_ifadown(&ia->ia_ifa, 1); 713 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE, 714 &ia->ia_ifa); 715 error = 0; 716 break; 717 718 default: 719 if (ifp == NULL || ifp->if_ioctl == NULL) 720 return (EOPNOTSUPP); 721 ifnet_serialize_all(ifp); 722 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred); 723 ifnet_deserialize_all(ifp); 724 return (error); 725 } 726 727 KKASSERT(cmd == SIOCDIFADDR || 728 ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && iaIsNew)); 729 730 ifa_ifunlink(&ia->ia_ifa, ifp); 731 in_iaunlink(ia); 732 733 if (cmd == SIOCDIFADDR) { 734 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 735 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) 736 in_iahash_remove(ia); 737 } 738 #ifdef INVARIANTS 739 else { 740 /* 741 * If cmd is SIOCSIFADDR or SIOCAIFADDR, in_ifinit() has 742 * already taken care of the deletion from hash table 743 */ 744 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 745 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0, 746 ("SIOC%cIFADDR failed on new ia, " 747 "but the new ia is still in hash table", 748 cmd == SIOCSIFADDR ? 'S' : 'A')); 749 } 750 #endif 751 752 ifa_destroy(&ia->ia_ifa); 753 754 if ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && 755 !ifpWasUp && (ifp->if_flags & IFF_UP)) { 756 /* 757 * Though the address assignment failed, the 758 * interface is brought up by in_ifinit() 759 * (via ifp->if_ioctl). With the hope that 760 * the interface has some valid addresses, we 761 * act as if IFF_UP flag was just set on the 762 * interface. 763 * 764 * NOTE: 765 * This could only be done after the failed 766 * address is unlinked from the global address 767 * list. 768 */ 769 if_up(ifp); 770 } 771 772 return (error); 773 } 774 775 /* 776 * SIOC[GAD]LIFADDR. 777 * SIOCGLIFADDR: get first address. (?!?) 778 * SIOCGLIFADDR with IFLR_PREFIX: 779 * get first address that matches the specified prefix. 780 * SIOCALIFADDR: add the specified address. 781 * SIOCALIFADDR with IFLR_PREFIX: 782 * EINVAL since we can't deduce hostid part of the address. 783 * SIOCDLIFADDR: delete the specified address. 784 * SIOCDLIFADDR with IFLR_PREFIX: 785 * delete the first address that matches the specified prefix. 786 * return values: 787 * EINVAL on invalid parameters 788 * EADDRNOTAVAIL on prefix match failed/specified address not found 789 * other values may be returned from in_ioctl() 790 * 791 * NOTE! td might be NULL. 792 */ 793 static int 794 in_lifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td) 795 { 796 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 797 798 /* sanity checks */ 799 if (!data || !ifp) { 800 panic("invalid argument to in_lifaddr_ioctl"); 801 /*NOTRECHED*/ 802 } 803 804 switch (cmd) { 805 case SIOCGLIFADDR: 806 /* address must be specified on GET with IFLR_PREFIX */ 807 if ((iflr->flags & IFLR_PREFIX) == 0) 808 break; 809 /*FALLTHROUGH*/ 810 case SIOCALIFADDR: 811 case SIOCDLIFADDR: 812 /* address must be specified on ADD and DELETE */ 813 if (iflr->addr.ss_family != AF_INET) 814 return EINVAL; 815 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 816 return EINVAL; 817 /* XXX need improvement */ 818 if (iflr->dstaddr.ss_family 819 && iflr->dstaddr.ss_family != AF_INET) 820 return EINVAL; 821 if (iflr->dstaddr.ss_family 822 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 823 return EINVAL; 824 break; 825 default: /*shouldn't happen*/ 826 return EOPNOTSUPP; 827 } 828 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 829 return EINVAL; 830 831 switch (cmd) { 832 case SIOCALIFADDR: 833 { 834 struct in_aliasreq ifra; 835 836 if (iflr->flags & IFLR_PREFIX) 837 return EINVAL; 838 839 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 840 bzero(&ifra, sizeof ifra); 841 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name); 842 843 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 844 845 if (iflr->dstaddr.ss_family) { /*XXX*/ 846 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 847 iflr->dstaddr.ss_len); 848 } 849 850 ifra.ifra_mask.sin_family = AF_INET; 851 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 852 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 853 854 return in_control_internal(SIOCAIFADDR, (caddr_t)&ifra, ifp, 855 td); 856 } 857 case SIOCGLIFADDR: 858 case SIOCDLIFADDR: 859 { 860 struct ifaddr_container *ifac; 861 struct in_ifaddr *ia; 862 struct in_addr mask, candidate, match; 863 struct sockaddr_in *sin; 864 int cmp; 865 866 bzero(&mask, sizeof mask); 867 if (iflr->flags & IFLR_PREFIX) { 868 /* lookup a prefix rather than address. */ 869 in_len2mask(&mask, iflr->prefixlen); 870 871 sin = (struct sockaddr_in *)&iflr->addr; 872 match.s_addr = sin->sin_addr.s_addr; 873 match.s_addr &= mask.s_addr; 874 875 /* if you set extra bits, that's wrong */ 876 if (match.s_addr != sin->sin_addr.s_addr) 877 return EINVAL; 878 879 cmp = 1; 880 } else { 881 if (cmd == SIOCGLIFADDR) { 882 /* on getting an address, take the 1st match */ 883 match.s_addr = 0; /* gcc4 warning */ 884 cmp = 0; /*XXX*/ 885 } else { 886 /* on deleting an address, do exact match */ 887 in_len2mask(&mask, 32); 888 sin = (struct sockaddr_in *)&iflr->addr; 889 match.s_addr = sin->sin_addr.s_addr; 890 891 cmp = 1; 892 } 893 } 894 895 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 896 struct ifaddr *ifa = ifac->ifa; 897 898 if (ifa->ifa_addr->sa_family != AF_INET6) 899 continue; 900 if (!cmp) 901 break; 902 candidate.s_addr = 903 ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 904 candidate.s_addr &= mask.s_addr; 905 if (candidate.s_addr == match.s_addr) 906 break; 907 } 908 if (ifac == NULL) 909 return EADDRNOTAVAIL; 910 ia = (struct in_ifaddr *)(ifac->ifa); 911 912 if (cmd == SIOCGLIFADDR) { 913 /* fill in the if_laddrreq structure */ 914 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 915 916 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 917 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 918 ia->ia_dstaddr.sin_len); 919 } else 920 bzero(&iflr->dstaddr, sizeof iflr->dstaddr); 921 922 iflr->prefixlen = 923 in_mask2len(&ia->ia_sockmask.sin_addr); 924 925 iflr->flags = 0; /*XXX*/ 926 927 return 0; 928 } else { 929 struct in_aliasreq ifra; 930 931 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 932 bzero(&ifra, sizeof ifra); 933 bcopy(iflr->iflr_name, ifra.ifra_name, 934 sizeof ifra.ifra_name); 935 936 bcopy(&ia->ia_addr, &ifra.ifra_addr, 937 ia->ia_addr.sin_len); 938 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 939 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 940 ia->ia_dstaddr.sin_len); 941 } 942 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 943 ia->ia_sockmask.sin_len); 944 945 return in_control_internal(SIOCDIFADDR, (caddr_t)&ifra, 946 ifp, td); 947 } 948 } 949 } 950 951 return EOPNOTSUPP; /*just for safety*/ 952 } 953 954 /* 955 * Delete any existing route for an interface. 956 */ 957 void 958 in_ifscrub(struct ifnet *ifp __unused, struct in_ifaddr *ia) 959 { 960 in_scrubprefix(ia); 961 } 962 963 /* 964 * Initialize an interface's internet address 965 * and routing table entry. 966 */ 967 static int 968 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, 969 const struct sockaddr_in *sin, int scrub) 970 { 971 u_long i = ntohl(sin->sin_addr.s_addr); 972 struct sockaddr_in oldaddr; 973 struct ifaddr_container *ifac; 974 int flags = RTF_UP, error = 0; 975 int was_hash = 0; 976 977 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 978 oldaddr = ia->ia_addr; 979 980 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) { 981 was_hash = 1; 982 in_iahash_remove(ia); 983 } 984 985 ia->ia_addr = *sin; 986 if (ia->ia_addr.sin_family == AF_INET) 987 in_iahash_insert(ia); 988 989 /* 990 * Give the interface a chance to initialize 991 * if this is its first address, 992 * and to validate the address if necessary. 993 */ 994 if (ifp->if_ioctl != NULL) { 995 ifnet_serialize_all(ifp); 996 error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL); 997 ifnet_deserialize_all(ifp); 998 if (error) 999 goto fail; 1000 } 1001 1002 /* 1003 * Delete old route, if requested. 1004 */ 1005 if (scrub) { 1006 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 1007 in_ifscrub(ifp, ia); 1008 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1009 } 1010 1011 /* 1012 * Calculate netmask/subnetmask. 1013 */ 1014 if (IN_CLASSA(i)) 1015 ia->ia_netmask = IN_CLASSA_NET; 1016 else if (IN_CLASSB(i)) 1017 ia->ia_netmask = IN_CLASSB_NET; 1018 else 1019 ia->ia_netmask = IN_CLASSC_NET; 1020 /* 1021 * The subnet mask usually includes at least the standard network part, 1022 * but may may be smaller in the case of supernetting. 1023 * If it is set, we believe it. 1024 */ 1025 if (ia->ia_subnetmask == 0) { 1026 ia->ia_subnetmask = ia->ia_netmask; 1027 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 1028 } else { 1029 ia->ia_netmask &= ia->ia_subnetmask; 1030 } 1031 ia->ia_net = i & ia->ia_netmask; 1032 ia->ia_subnet = i & ia->ia_subnetmask; 1033 in_socktrim(&ia->ia_sockmask); 1034 1035 /* 1036 * Add route for the network. 1037 */ 1038 ia->ia_ifa.ifa_metric = ifp->if_metric; 1039 if (ifp->if_flags & IFF_BROADCAST) { 1040 if (ia->ia_subnetmask == IN_RFC3021_MASK) { 1041 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST; 1042 ia->ia_netbroadcast.s_addr = INADDR_BROADCAST; 1043 } else { 1044 ia->ia_broadaddr.sin_addr.s_addr = 1045 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 1046 ia->ia_netbroadcast.s_addr = 1047 htonl(ia->ia_net | ~ ia->ia_netmask); 1048 } 1049 } else if (ifp->if_flags & IFF_LOOPBACK) { 1050 ia->ia_dstaddr = ia->ia_addr; 1051 flags |= RTF_HOST; 1052 } else if (ifp->if_flags & IFF_POINTOPOINT) { 1053 if (ia->ia_dstaddr.sin_family != AF_INET) 1054 return (0); 1055 flags |= RTF_HOST; 1056 } 1057 1058 /*- 1059 * Don't add host routes for interface addresses of 1060 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it 1061 * possible to assign several such address pairs with consistent 1062 * results (no host route) and is required by BOOTP. 1063 * 1064 * XXX: This is ugly ! There should be a way for the caller to 1065 * say that they don't want a host route. 1066 */ 1067 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY || 1068 ia->ia_netmask != IN_CLASSA_NET || 1069 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) { 1070 error = in_addprefix(ia, flags); 1071 if (error) 1072 goto fail; 1073 } 1074 1075 /* 1076 * If the interface supports multicast, join the "all hosts" 1077 * multicast group on that interface. 1078 */ 1079 if (ifp->if_flags & IFF_MULTICAST) { 1080 struct in_addr addr; 1081 1082 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 1083 in_addmulti(&addr, ifp); 1084 } 1085 return (0); 1086 fail: 1087 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) 1088 in_iahash_remove(ia); 1089 1090 ia->ia_addr = oldaddr; 1091 if (was_hash) 1092 in_iahash_insert(ia); 1093 return (error); 1094 } 1095 1096 #define rtinitflags(x) \ 1097 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 1098 ? RTF_HOST : 0) 1099 1100 /* 1101 * Add a route to prefix ("connected route" in cisco terminology). 1102 * Do nothing, if there are some interface addresses with the same 1103 * prefix already. This function assumes that the 'target' parent 1104 * interface is UP. 1105 */ 1106 static int 1107 in_addprefix(struct in_ifaddr *target, int flags) 1108 { 1109 struct in_ifaddr_container *iac; 1110 struct in_addr prefix, mask; 1111 int error; 1112 1113 #ifdef CARP 1114 /* 1115 * Don't add prefix routes for CARP interfaces. 1116 * Prefix routes creation is handled by CARP 1117 * interfaces themselves. 1118 */ 1119 if (target->ia_ifp->if_type == IFT_CARP) 1120 return 0; 1121 #endif 1122 1123 mask = target->ia_sockmask.sin_addr; 1124 if (flags & RTF_HOST) { 1125 prefix = target->ia_dstaddr.sin_addr; 1126 } else { 1127 prefix = target->ia_addr.sin_addr; 1128 prefix.s_addr &= mask.s_addr; 1129 } 1130 1131 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 1132 struct in_ifaddr *ia = iac->ia; 1133 struct in_addr p; 1134 1135 /* Don't test against self */ 1136 if (ia == target) 1137 continue; 1138 1139 /* The tested address does not own a route entry */ 1140 if ((ia->ia_flags & IFA_ROUTE) == 0) 1141 continue; 1142 1143 /* Prefix test */ 1144 if (rtinitflags(ia) != 0) { 1145 p = ia->ia_dstaddr.sin_addr; 1146 } else { 1147 p = ia->ia_addr.sin_addr; 1148 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1149 } 1150 if (prefix.s_addr != p.s_addr) 1151 continue; 1152 1153 /* 1154 * If the to-be-added address and the currently being 1155 * tested address are not host addresses, we need to 1156 * take subnetmask into consideration. 1157 */ 1158 if (!(flags & RTF_HOST) && rtinitflags(ia) == 0 && 1159 mask.s_addr != ia->ia_sockmask.sin_addr.s_addr) 1160 continue; 1161 1162 /* 1163 * If we got a matching prefix route inserted by other 1164 * interface address, we don't need to bother. 1165 */ 1166 return 0; 1167 } 1168 1169 /* 1170 * No one seem to have prefix route; insert it. 1171 */ 1172 error = rtinit(&target->ia_ifa, RTM_ADD, flags); 1173 if (!error) 1174 target->ia_flags |= IFA_ROUTE; 1175 return error; 1176 } 1177 1178 /* 1179 * Remove a route to prefix ("connected route" in cisco terminology). 1180 * Re-installs the route by using another interface address, if there's 1181 * one with the same prefix (otherwise we lose the route mistakenly). 1182 */ 1183 static void 1184 in_scrubprefix(struct in_ifaddr *target) 1185 { 1186 struct in_ifaddr_container *iac; 1187 struct in_addr prefix, mask; 1188 int error; 1189 1190 #ifdef CARP 1191 /* 1192 * Don't scrub prefix routes for CARP interfaces. 1193 * Prefix routes deletion is handled by CARP 1194 * interfaces themselves. 1195 */ 1196 if (target->ia_ifp->if_type == IFT_CARP) 1197 return; 1198 #endif 1199 1200 if ((target->ia_flags & IFA_ROUTE) == 0) 1201 return; 1202 1203 mask = target->ia_sockmask.sin_addr; 1204 if (rtinitflags(target) != 0) { 1205 prefix = target->ia_dstaddr.sin_addr; 1206 } else { 1207 prefix = target->ia_addr.sin_addr; 1208 prefix.s_addr &= mask.s_addr; 1209 } 1210 1211 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 1212 struct in_ifaddr *ia = iac->ia; 1213 struct in_addr p; 1214 1215 /* Don't test against self */ 1216 if (ia == target) 1217 continue; 1218 1219 /* The tested address already owns a route entry */ 1220 if (ia->ia_flags & IFA_ROUTE) 1221 continue; 1222 1223 /* 1224 * The prefix route of the tested address should 1225 * never be installed if its parent interface is 1226 * not UP yet. 1227 */ 1228 if ((ia->ia_ifp->if_flags & IFF_UP) == 0) 1229 continue; 1230 1231 #ifdef CARP 1232 /* 1233 * Don't add prefix routes for CARP interfaces. 1234 * Prefix routes creation is handled by CARP 1235 * interfaces themselves. 1236 */ 1237 if (ia->ia_ifp->if_type == IFT_CARP) 1238 continue; 1239 #endif 1240 1241 /* Prefix test */ 1242 if (rtinitflags(ia) != 0) { 1243 p = ia->ia_dstaddr.sin_addr; 1244 } else { 1245 p = ia->ia_addr.sin_addr; 1246 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1247 } 1248 if (prefix.s_addr != p.s_addr) 1249 continue; 1250 1251 /* 1252 * We don't need to test subnetmask here, as what we do 1253 * in in_addprefix(), since if the the tested address's 1254 * parent interface is UP, the tested address should own 1255 * a prefix route entry and we would never reach here. 1256 */ 1257 1258 /* 1259 * If we got a matching prefix route, move IFA_ROUTE to him 1260 */ 1261 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target)); 1262 target->ia_flags &= ~IFA_ROUTE; 1263 1264 error = rtinit(&ia->ia_ifa, RTM_ADD, rtinitflags(ia) | RTF_UP); 1265 if (!error) 1266 ia->ia_flags |= IFA_ROUTE; 1267 return; 1268 } 1269 1270 /* 1271 * No candidates for this prefix route; just remove it. 1272 */ 1273 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target)); 1274 target->ia_flags &= ~IFA_ROUTE; 1275 } 1276 1277 #undef rtinitflags 1278 1279 /* 1280 * Return 1 if the address might be a local broadcast address. 1281 */ 1282 int 1283 in_broadcast(struct in_addr in, struct ifnet *ifp) 1284 { 1285 struct ifaddr_container *ifac; 1286 u_long t; 1287 1288 if (in.s_addr == INADDR_BROADCAST || 1289 in.s_addr == INADDR_ANY) 1290 return 1; 1291 if (ifp == NULL || (ifp->if_flags & IFF_BROADCAST) == 0) 1292 return 0; 1293 t = ntohl(in.s_addr); 1294 /* 1295 * Look through the list of addresses for a match 1296 * with a broadcast address. 1297 */ 1298 #define ia ((struct in_ifaddr *)ifa) 1299 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1300 struct ifaddr *ifa = ifac->ifa; 1301 1302 if (ifa->ifa_addr->sa_family == AF_INET && 1303 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1304 in.s_addr == ia->ia_netbroadcast.s_addr || 1305 /* 1306 * Check for old-style (host 0) broadcast, but 1307 * taking into account that RFC 3021 obsoletes it. 1308 */ 1309 (ia->ia_subnetmask != IN_RFC3021_MASK && 1310 (t == ia->ia_subnet || t == ia->ia_net))) && 1311 /* 1312 * Check for an all one subnetmask. These 1313 * only exist when an interface gets a secondary 1314 * address. 1315 */ 1316 ia->ia_subnetmask != (u_long)0xffffffff) 1317 return 1; 1318 } 1319 return (0); 1320 #undef ia 1321 } 1322 1323 /* 1324 * Add an address to the list of IP multicast addresses for a given interface. 1325 */ 1326 struct in_multi * 1327 in_addmulti(struct in_addr *ap, struct ifnet *ifp) 1328 { 1329 struct in_multi *inm; 1330 int error; 1331 struct sockaddr_in sin; 1332 struct ifmultiaddr *ifma; 1333 1334 ASSERT_NETISR0; 1335 1336 /* 1337 * Call generic routine to add membership or increment 1338 * refcount. It wants addresses in the form of a sockaddr, 1339 * so we build one here (being careful to zero the unused bytes). 1340 */ 1341 bzero(&sin, sizeof sin); 1342 sin.sin_family = AF_INET; 1343 sin.sin_len = sizeof sin; 1344 sin.sin_addr = *ap; 1345 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 1346 if (error) 1347 return NULL; 1348 1349 /* 1350 * If ifma->ifma_protospec is null, then if_addmulti() created 1351 * a new record. Otherwise, we are done. 1352 */ 1353 if (ifma->ifma_protospec != NULL) 1354 return ifma->ifma_protospec; 1355 1356 inm = kmalloc(sizeof *inm, M_IPMADDR, M_INTWAIT | M_ZERO); 1357 inm->inm_addr = *ap; 1358 inm->inm_ifp = ifp; 1359 inm->inm_ifma = ifma; 1360 ifma->ifma_protospec = inm; 1361 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 1362 1363 /* 1364 * Let IGMP know that we have joined a new IP multicast group. 1365 */ 1366 igmp_joingroup(inm); 1367 return inm; 1368 } 1369 1370 /* 1371 * Delete a multicast address record. 1372 */ 1373 void 1374 in_delmulti(struct in_multi *inm) 1375 { 1376 struct ifmultiaddr *ifma; 1377 struct in_multi my_inm; 1378 1379 ASSERT_NETISR0; 1380 1381 ifma = inm->inm_ifma; 1382 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 1383 if (ifma->ifma_refcount == 1) { 1384 /* 1385 * No remaining claims to this record; let IGMP know that 1386 * we are leaving the multicast group. 1387 * But do it after the if_delmulti() which might reset 1388 * the interface and nuke the packet. 1389 */ 1390 my_inm = *inm ; 1391 ifma->ifma_protospec = NULL; 1392 LIST_REMOVE(inm, inm_link); 1393 kfree(inm, M_IPMADDR); 1394 } 1395 /* XXX - should be separate API for when we have an ifma? */ 1396 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1397 if (my_inm.inm_ifp != NULL) 1398 igmp_leavegroup(&my_inm); 1399 } 1400 1401 void 1402 in_if_down(struct ifnet *ifp) 1403 { 1404 rt_purgecloned(ifp, AF_INET); 1405 } 1406 1407 static void 1408 in_ifdetach_dispatch(netmsg_t nmsg) 1409 { 1410 struct lwkt_msg *lmsg = &nmsg->lmsg; 1411 struct ifnet *ifp = lmsg->u.ms_resultp; 1412 int cpu; 1413 1414 in_pcbpurgeif0(&ripcbinfo, ifp); 1415 for (cpu = 0; cpu < netisr_ncpus; ++cpu) 1416 in_pcbpurgeif0(&udbinfo[cpu], ifp); 1417 1418 lwkt_replymsg(lmsg, 0); 1419 } 1420 1421 void 1422 in_ifdetach(struct ifnet *ifp) 1423 { 1424 struct netmsg_base nmsg; 1425 struct lwkt_msg *lmsg = &nmsg.lmsg; 1426 1427 netmsg_init(&nmsg, NULL, &curthread->td_msgport, 0, 1428 in_ifdetach_dispatch); 1429 lmsg->u.ms_resultp = ifp; 1430 1431 lwkt_domsg(netisr_cpuport(0), lmsg, 0); 1432 } 1433