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/caps.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 if ((i & ia->ia_netmask) == ia->ia_net) 104 return (1); 105 } 106 } else { 107 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 108 ia = iac->ia; 109 if ((i & ia->ia_subnetmask) == ia->ia_subnet) 110 return (1); 111 } 112 } 113 114 return (0); 115 } 116 117 /* 118 * Determine whether an IP address is in a reserved set of addresses 119 * that may not be forwarded, or whether datagrams to that destination 120 * may be forwarded. 121 */ 122 int 123 in_canforward(struct in_addr in) 124 { 125 u_long i = ntohl(in.s_addr); 126 u_long net; 127 128 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) 129 return (0); 130 if (IN_CLASSA(i)) { 131 net = i & IN_CLASSA_NET; 132 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 133 return (0); 134 } 135 return (1); 136 } 137 138 /* 139 * Trim a mask in a sockaddr 140 */ 141 static void 142 in_socktrim(struct sockaddr_in *ap) 143 { 144 char *cplim = (char *) &ap->sin_addr; 145 char *cp = (char *) (&ap->sin_addr + 1); 146 147 ap->sin_len = 0; 148 while (--cp >= cplim) { 149 if (*cp) { 150 (ap)->sin_len = cp - (char *) (ap) + 1; 151 break; 152 } 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 = caps_priv_check_td(td, 434 SYSCAP_RESTRICTEDROOT)) != 0) 435 { 436 return error; 437 } 438 /* FALLTHROUGH */ 439 case SIOCGLIFADDR: 440 if (!ifp) 441 return EINVAL; 442 return in_lifaddr_ioctl(cmd, data, ifp, td); 443 } 444 445 iaIsNew = 0; 446 ifpWasUp = 0; 447 448 /* 449 * Find address for this interface, if it exists. 450 * 451 * If an alias address was specified, find that one instead of 452 * the first one on the interface, if possible. 453 */ 454 if (ifp) { 455 struct in_ifaddr *iap; 456 457 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 458 LIST_FOREACH(iac, INADDR_HASH(dst.s_addr), ia_hash) { 459 iap = iac->ia; 460 if (iap->ia_ifp == ifp && 461 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 462 ia = iap; 463 break; 464 } 465 } 466 if (ia == NULL) { 467 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], 468 ifa_link) { 469 iap = ifatoia(ifac->ifa); 470 if (iap->ia_addr.sin_family == AF_INET) { 471 ia = iap; 472 break; 473 } 474 } 475 } 476 477 if (ifp->if_flags & IFF_UP) 478 ifpWasUp = 1; 479 } 480 481 switch (cmd) { 482 case SIOCAIFADDR: 483 case SIOCDIFADDR: 484 case SIOCGIFALIAS: 485 if (ifp == NULL) 486 return (EADDRNOTAVAIL); 487 if (ifra->ifra_addr.sin_family == AF_INET) { 488 while (ia != NULL) { 489 if (ia->ia_ifp == ifp && 490 ia->ia_addr.sin_addr.s_addr == 491 ifra->ifra_addr.sin_addr.s_addr) 492 break; 493 ia = in_ianext(ia); 494 } 495 if ((ifp->if_flags & IFF_POINTOPOINT) && 496 cmd == SIOCAIFADDR && 497 ifra->ifra_dstaddr.sin_addr.s_addr == INADDR_ANY) { 498 return EDESTADDRREQ; 499 } 500 } 501 if ((cmd == SIOCDIFADDR || cmd == SIOCGIFALIAS) && ia == NULL) 502 return (EADDRNOTAVAIL); 503 if (cmd == SIOCGIFALIAS) 504 break; 505 /* FALLTHROUGH */ 506 case SIOCSIFADDR: 507 case SIOCSIFNETMASK: 508 case SIOCSIFDSTADDR: 509 if (td && (error = caps_priv_check_td(td, 510 SYSCAP_RESTRICTEDROOT)) != 0) 511 { 512 return error; 513 } 514 515 if (ifp == NULL) 516 return (EADDRNOTAVAIL); 517 518 if (cmd == SIOCSIFDSTADDR && 519 (ifp->if_flags & IFF_POINTOPOINT) == 0) 520 return (EINVAL); 521 522 if (ia == NULL) { 523 struct ifaddr *ifa; 524 int i; 525 526 ia = ifa_create(sizeof(*ia)); 527 ifa = &ia->ia_ifa; 528 529 /* 530 * Setup per-CPU information 531 */ 532 for (i = 0; i < ncpus; ++i) { 533 ifac = &ifa->ifa_containers[i]; 534 iac = &ifac->ifa_proto_u.u_in_ifac; 535 iac->ia = ia; 536 iac->ia_ifac = ifac; 537 } 538 539 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 540 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 541 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 542 ia->ia_sockmask.sin_len = 8; 543 ia->ia_sockmask.sin_family = AF_INET; 544 if (ifp->if_flags & IFF_BROADCAST) { 545 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr; 546 ia->ia_broadaddr.sin_family = AF_INET; 547 } 548 ia->ia_ifp = ifp; 549 iaIsNew = 1; 550 551 in_ialink(ia); 552 ifa_iflink(ifa, ifp, 1); 553 } 554 break; 555 556 case SIOCSIFBRDADDR: 557 if (td && (error = caps_priv_check_td(td, 558 SYSCAP_RESTRICTEDROOT)) != 0) 559 { 560 return error; 561 } 562 /* FALLTHROUGH */ 563 564 case SIOCGIFADDR: 565 case SIOCGIFNETMASK: 566 case SIOCGIFDSTADDR: 567 case SIOCGIFBRDADDR: 568 if (ia == NULL) 569 return (EADDRNOTAVAIL); 570 break; 571 } 572 573 switch (cmd) { 574 case SIOCGIFADDR: 575 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 576 return (0); 577 578 case SIOCGIFBRDADDR: 579 if ((ifp->if_flags & IFF_BROADCAST) == 0) 580 return (EINVAL); 581 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 582 return (0); 583 584 case SIOCGIFDSTADDR: 585 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 586 return (EINVAL); 587 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 588 return (0); 589 590 case SIOCGIFNETMASK: 591 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 592 return (0); 593 594 case SIOCSIFDSTADDR: 595 KKASSERT(ifp->if_flags & IFF_POINTOPOINT); 596 597 oldaddr = ia->ia_dstaddr; 598 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 599 if (ifp->if_ioctl != NULL) { 600 ifnet_serialize_all(ifp); 601 error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia, 602 td->td_proc->p_ucred); 603 ifnet_deserialize_all(ifp); 604 if (error) { 605 ia->ia_dstaddr = oldaddr; 606 return (error); 607 } 608 } 609 if (ia->ia_flags & IFA_ROUTE) { 610 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 611 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 612 ia->ia_ifa.ifa_dstaddr = 613 (struct sockaddr *)&ia->ia_dstaddr; 614 rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP); 615 } 616 return (0); 617 618 case SIOCSIFBRDADDR: 619 if ((ifp->if_flags & IFF_BROADCAST) == 0) 620 return (EINVAL); 621 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 622 return (0); 623 624 case SIOCSIFADDR: 625 error = in_ifinit(ifp, ia, 626 (const struct sockaddr_in *)&ifr->ifr_addr, 1); 627 if (error != 0 && iaIsNew) 628 break; 629 if (error == 0) { 630 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 631 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 632 &ia->ia_ifa); 633 } 634 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) { 635 /* 636 * Interface is brought up by in_ifinit() 637 * (via ifp->if_ioctl). We act as if the 638 * interface got IFF_UP flag turned on. 639 */ 640 if_up(ifp); 641 } 642 return (0); 643 644 case SIOCSIFNETMASK: 645 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 646 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 647 return (0); 648 649 case SIOCAIFADDR: 650 maskIsNew = 0; 651 hostIsNew = 1; 652 error = 0; 653 if (ia->ia_addr.sin_family == AF_INET) { 654 if (ifra->ifra_addr.sin_len == 0) { 655 ifra->ifra_addr = ia->ia_addr; 656 hostIsNew = 0; 657 } else if (ifra->ifra_addr.sin_addr.s_addr == 658 ia->ia_addr.sin_addr.s_addr) { 659 hostIsNew = 0; 660 } 661 } 662 if (ifra->ifra_mask.sin_len) { 663 in_ifscrub(ifp, ia); 664 ia->ia_sockmask = ifra->ifra_mask; 665 ia->ia_sockmask.sin_family = AF_INET; 666 ia->ia_subnetmask = 667 ntohl(ia->ia_sockmask.sin_addr.s_addr); 668 maskIsNew = 1; 669 } 670 if ((ifp->if_flags & IFF_POINTOPOINT) && 671 ifra->ifra_dstaddr.sin_family == AF_INET) { 672 in_ifscrub(ifp, ia); 673 ia->ia_dstaddr = ifra->ifra_dstaddr; 674 maskIsNew = 1; /* We lie; but the effect's the same */ 675 } 676 if (ifra->ifra_addr.sin_family == AF_INET && 677 (hostIsNew || maskIsNew)) 678 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 679 680 if (error != 0 && iaIsNew) 681 break; 682 683 if ((ifp->if_flags & IFF_BROADCAST) && 684 ifra->ifra_broadaddr.sin_family == AF_INET) 685 ia->ia_broadaddr = ifra->ifra_broadaddr; 686 if (error == 0) { 687 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 688 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 689 &ia->ia_ifa); 690 } 691 if (!ifpWasUp && (ifp->if_flags & IFF_UP)) { 692 /* See the comment in SIOCSIFADDR */ 693 if_up(ifp); 694 } 695 return (error); 696 697 case SIOCGIFALIAS: 698 ifra->ifra_mask = ia->ia_sockmask; 699 if ((ifp->if_flags & IFF_POINTOPOINT) && 700 (ia->ia_dstaddr.sin_family == AF_INET)) 701 ifra->ifra_dstaddr = ia->ia_dstaddr; 702 else if ((ifp->if_flags & IFF_BROADCAST) && 703 (ia->ia_broadaddr.sin_family == AF_INET)) 704 ifra->ifra_broadaddr = ia->ia_broadaddr; 705 else 706 memset(&ifra->ifra_broadaddr, 0, 707 sizeof(ifra->ifra_broadaddr)); 708 return (0); 709 710 case SIOCDIFADDR: 711 /* 712 * in_ifscrub kills the interface route. 713 */ 714 in_ifscrub(ifp, ia); 715 /* 716 * in_ifadown gets rid of all the rest of 717 * the routes. This is not quite the right 718 * thing to do, but at least if we are running 719 * a routing process they will come back. 720 */ 721 in_ifadown(&ia->ia_ifa, 1); 722 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE, 723 &ia->ia_ifa); 724 error = 0; 725 break; 726 727 default: 728 if (ifp == NULL || ifp->if_ioctl == NULL) 729 return (EOPNOTSUPP); 730 ifnet_serialize_all(ifp); 731 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred); 732 ifnet_deserialize_all(ifp); 733 return (error); 734 } 735 736 KKASSERT(cmd == SIOCDIFADDR || 737 ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && iaIsNew)); 738 739 ifa_ifunlink(&ia->ia_ifa, ifp); 740 in_iaunlink(ia); 741 742 if (cmd == SIOCDIFADDR) { 743 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 744 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) 745 in_iahash_remove(ia); 746 } 747 #ifdef INVARIANTS 748 else { 749 /* 750 * If cmd is SIOCSIFADDR or SIOCAIFADDR, in_ifinit() has 751 * already taken care of the deletion from hash table 752 */ 753 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 754 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0, 755 ("SIOC%cIFADDR failed on new ia, " 756 "but the new ia is still in hash table", 757 cmd == SIOCSIFADDR ? 'S' : 'A')); 758 } 759 #endif 760 761 ifa_destroy(&ia->ia_ifa); 762 763 if ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && 764 !ifpWasUp && (ifp->if_flags & IFF_UP)) { 765 /* 766 * Though the address assignment failed, the 767 * interface is brought up by in_ifinit() 768 * (via ifp->if_ioctl). With the hope that 769 * the interface has some valid addresses, we 770 * act as if IFF_UP flag was just set on the 771 * interface. 772 * 773 * NOTE: 774 * This could only be done after the failed 775 * address is unlinked from the global address 776 * list. 777 */ 778 if_up(ifp); 779 } 780 781 return (error); 782 } 783 784 /* 785 * SIOC[GAD]LIFADDR. 786 * SIOCGLIFADDR: get first address. (?!?) 787 * SIOCGLIFADDR with IFLR_PREFIX: 788 * get first address that matches the specified prefix. 789 * SIOCALIFADDR: add the specified address. 790 * SIOCALIFADDR with IFLR_PREFIX: 791 * EINVAL since we can't deduce hostid part of the address. 792 * SIOCDLIFADDR: delete the specified address. 793 * SIOCDLIFADDR with IFLR_PREFIX: 794 * delete the first address that matches the specified prefix. 795 * return values: 796 * EINVAL on invalid parameters 797 * EADDRNOTAVAIL on prefix match failed/specified address not found 798 * other values may be returned from in_ioctl() 799 * 800 * NOTE! td might be NULL. 801 */ 802 static int 803 in_lifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td) 804 { 805 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 806 807 /* sanity checks */ 808 if (!data || !ifp) { 809 panic("invalid argument to in_lifaddr_ioctl"); 810 /*NOTRECHED*/ 811 } 812 813 switch (cmd) { 814 case SIOCGLIFADDR: 815 /* address must be specified on GET with IFLR_PREFIX */ 816 if ((iflr->flags & IFLR_PREFIX) == 0) 817 break; 818 /*FALLTHROUGH*/ 819 case SIOCALIFADDR: 820 case SIOCDLIFADDR: 821 /* address must be specified on ADD and DELETE */ 822 if (iflr->addr.ss_family != AF_INET) 823 return EINVAL; 824 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 825 return EINVAL; 826 /* XXX need improvement */ 827 if (iflr->dstaddr.ss_family && 828 iflr->dstaddr.ss_family != AF_INET) 829 return EINVAL; 830 if (iflr->dstaddr.ss_family && 831 iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 832 return EINVAL; 833 break; 834 default: /*shouldn't happen*/ 835 return EOPNOTSUPP; 836 } 837 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 838 return EINVAL; 839 840 switch (cmd) { 841 case SIOCALIFADDR: 842 { 843 struct in_aliasreq ifra; 844 845 if (iflr->flags & IFLR_PREFIX) 846 return EINVAL; 847 848 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 849 bzero(&ifra, sizeof ifra); 850 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name); 851 852 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 853 854 if (iflr->dstaddr.ss_family) { /*XXX*/ 855 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 856 iflr->dstaddr.ss_len); 857 } 858 859 ifra.ifra_mask.sin_family = AF_INET; 860 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 861 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 862 863 return in_control_internal(SIOCAIFADDR, (caddr_t)&ifra, ifp, 864 td); 865 } 866 case SIOCGLIFADDR: 867 case SIOCDLIFADDR: 868 { 869 struct ifaddr_container *ifac; 870 struct in_ifaddr *ia; 871 struct in_addr mask, candidate, match; 872 struct sockaddr_in *sin; 873 int cmp; 874 875 bzero(&mask, sizeof mask); 876 if (iflr->flags & IFLR_PREFIX) { 877 /* lookup a prefix rather than address. */ 878 in_len2mask(&mask, iflr->prefixlen); 879 880 sin = (struct sockaddr_in *)&iflr->addr; 881 match.s_addr = sin->sin_addr.s_addr; 882 match.s_addr &= mask.s_addr; 883 884 /* if you set extra bits, that's wrong */ 885 if (match.s_addr != sin->sin_addr.s_addr) 886 return EINVAL; 887 888 cmp = 1; 889 } else { 890 if (cmd == SIOCGLIFADDR) { 891 /* on getting an address, take the 1st match */ 892 match.s_addr = 0; /* gcc4 warning */ 893 cmp = 0; /*XXX*/ 894 } else { 895 /* on deleting an address, do exact match */ 896 in_len2mask(&mask, 32); 897 sin = (struct sockaddr_in *)&iflr->addr; 898 match.s_addr = sin->sin_addr.s_addr; 899 900 cmp = 1; 901 } 902 } 903 904 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 905 struct ifaddr *ifa = ifac->ifa; 906 907 if (ifa->ifa_addr->sa_family != AF_INET6) 908 continue; 909 if (!cmp) 910 break; 911 candidate.s_addr = 912 ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 913 candidate.s_addr &= mask.s_addr; 914 if (candidate.s_addr == match.s_addr) 915 break; 916 } 917 if (ifac == NULL) 918 return EADDRNOTAVAIL; 919 ia = (struct in_ifaddr *)(ifac->ifa); 920 921 if (cmd == SIOCGLIFADDR) { 922 /* fill in the if_laddrreq structure */ 923 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 924 925 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 926 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 927 ia->ia_dstaddr.sin_len); 928 } else 929 bzero(&iflr->dstaddr, sizeof iflr->dstaddr); 930 931 iflr->prefixlen = 932 in_mask2len(&ia->ia_sockmask.sin_addr); 933 934 iflr->flags = 0; /*XXX*/ 935 936 return 0; 937 } else { 938 struct in_aliasreq ifra; 939 940 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 941 bzero(&ifra, sizeof ifra); 942 bcopy(iflr->iflr_name, ifra.ifra_name, 943 sizeof ifra.ifra_name); 944 945 bcopy(&ia->ia_addr, &ifra.ifra_addr, 946 ia->ia_addr.sin_len); 947 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 948 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 949 ia->ia_dstaddr.sin_len); 950 } 951 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 952 ia->ia_sockmask.sin_len); 953 954 return in_control_internal(SIOCDIFADDR, (caddr_t)&ifra, 955 ifp, td); 956 } 957 } 958 } 959 960 return EOPNOTSUPP; /*just for safety*/ 961 } 962 963 /* 964 * Delete any existing route for an interface. 965 */ 966 void 967 in_ifscrub(struct ifnet *ifp __unused, struct in_ifaddr *ia) 968 { 969 in_scrubprefix(ia); 970 } 971 972 /* 973 * Initialize an interface's internet address 974 * and routing table entry. 975 */ 976 static int 977 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, 978 const struct sockaddr_in *sin, int scrub) 979 { 980 u_long i = ntohl(sin->sin_addr.s_addr); 981 struct sockaddr_in oldaddr; 982 struct ifaddr_container *ifac; 983 int flags = RTF_UP, error = 0; 984 int was_hash = 0; 985 986 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 987 oldaddr = ia->ia_addr; 988 989 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) { 990 was_hash = 1; 991 in_iahash_remove(ia); 992 } 993 994 ia->ia_addr = *sin; 995 if (ia->ia_addr.sin_family == AF_INET) 996 in_iahash_insert(ia); 997 998 /* 999 * Give the interface a chance to initialize 1000 * if this is its first address, 1001 * and to validate the address if necessary. 1002 */ 1003 if (ifp->if_ioctl != NULL) { 1004 ifnet_serialize_all(ifp); 1005 error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL); 1006 ifnet_deserialize_all(ifp); 1007 if (error) 1008 goto fail; 1009 } 1010 1011 /* 1012 * Delete old route, if requested. 1013 */ 1014 if (scrub) { 1015 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 1016 in_ifscrub(ifp, ia); 1017 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1018 } 1019 1020 /* 1021 * Calculate netmask/subnetmask. 1022 */ 1023 if (IN_CLASSA(i)) 1024 ia->ia_netmask = IN_CLASSA_NET; 1025 else if (IN_CLASSB(i)) 1026 ia->ia_netmask = IN_CLASSB_NET; 1027 else 1028 ia->ia_netmask = IN_CLASSC_NET; 1029 /* 1030 * The subnet mask usually includes at least the standard network part, 1031 * but may be smaller in the case of supernetting. 1032 * If it is set, we believe it. 1033 */ 1034 if (ia->ia_subnetmask == 0) { 1035 ia->ia_subnetmask = ia->ia_netmask; 1036 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 1037 } else { 1038 ia->ia_netmask &= ia->ia_subnetmask; 1039 } 1040 ia->ia_net = i & ia->ia_netmask; 1041 ia->ia_subnet = i & ia->ia_subnetmask; 1042 in_socktrim(&ia->ia_sockmask); 1043 1044 /* 1045 * Add route for the network. 1046 */ 1047 ia->ia_ifa.ifa_metric = ifp->if_metric; 1048 if (ifp->if_flags & IFF_BROADCAST) { 1049 if (ia->ia_subnetmask == IN_RFC3021_MASK) { 1050 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST; 1051 ia->ia_netbroadcast.s_addr = INADDR_BROADCAST; 1052 } else { 1053 ia->ia_broadaddr.sin_addr.s_addr = 1054 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 1055 ia->ia_netbroadcast.s_addr = 1056 htonl(ia->ia_net | ~ia->ia_netmask); 1057 } 1058 } else if (ifp->if_flags & IFF_LOOPBACK) { 1059 ia->ia_dstaddr = ia->ia_addr; 1060 flags |= RTF_HOST; 1061 } else if (ifp->if_flags & IFF_POINTOPOINT) { 1062 if (ia->ia_dstaddr.sin_family != AF_INET) 1063 return (0); 1064 flags |= RTF_HOST; 1065 } 1066 1067 /* 1068 * Ignore the INADDR_ANY address added by DHCP/BOOTP. 1069 */ 1070 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY) { 1071 error = in_addprefix(ia, flags); 1072 if (error) 1073 goto fail; 1074 } 1075 1076 /* 1077 * If the interface supports multicast, join the "all hosts" 1078 * multicast group on that interface. 1079 */ 1080 if (ifp->if_flags & IFF_MULTICAST) { 1081 struct in_addr addr; 1082 1083 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 1084 in_addmulti(&addr, ifp); 1085 } 1086 1087 return (0); 1088 1089 fail: 1090 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) 1091 in_iahash_remove(ia); 1092 ia->ia_addr = oldaddr; 1093 if (was_hash) 1094 in_iahash_insert(ia); 1095 return (error); 1096 } 1097 1098 #define rtinitflags(x) \ 1099 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 1100 ? RTF_HOST : 0) 1101 1102 /* 1103 * Add a route to prefix ("connected route" in cisco terminology). 1104 * Do nothing, if there are some interface addresses with the same 1105 * prefix already. This function assumes that the 'target' parent 1106 * interface is UP. 1107 */ 1108 static int 1109 in_addprefix(struct in_ifaddr *target, int flags) 1110 { 1111 struct in_ifaddr_container *iac; 1112 struct in_addr prefix, mask; 1113 int error; 1114 1115 #ifdef CARP 1116 /* 1117 * Don't add prefix routes for CARP interfaces. 1118 * Prefix routes creation is handled by CARP 1119 * interfaces themselves. 1120 */ 1121 if (target->ia_ifp->if_type == IFT_CARP) 1122 return 0; 1123 #endif 1124 1125 /* 1126 * Add a loopback route to the interface address. 1127 */ 1128 if ((target->ia_ifp->if_flags & IFF_LOOPBACK) == 0) 1129 ifa_add_loopback_route(&target->ia_ifa, 1130 (struct sockaddr *)&target->ia_addr); 1131 1132 mask = target->ia_sockmask.sin_addr; 1133 if (flags & RTF_HOST) { 1134 prefix = target->ia_dstaddr.sin_addr; 1135 } else { 1136 prefix = target->ia_addr.sin_addr; 1137 prefix.s_addr &= mask.s_addr; 1138 } 1139 1140 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 1141 struct in_ifaddr *ia = iac->ia; 1142 struct in_addr p; 1143 1144 /* Don't test against self */ 1145 if (ia == target) 1146 continue; 1147 1148 /* The tested address does not own a route entry */ 1149 if ((ia->ia_flags & IFA_ROUTE) == 0) 1150 continue; 1151 1152 /* Prefix test */ 1153 if (rtinitflags(ia) != 0) { 1154 p = ia->ia_dstaddr.sin_addr; 1155 } else { 1156 p = ia->ia_addr.sin_addr; 1157 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1158 } 1159 if (prefix.s_addr != p.s_addr) 1160 continue; 1161 1162 /* 1163 * If the to-be-added address and the currently being 1164 * tested address are not host addresses, we need to 1165 * take subnetmask into consideration. 1166 */ 1167 if (!(flags & RTF_HOST) && rtinitflags(ia) == 0 && 1168 mask.s_addr != ia->ia_sockmask.sin_addr.s_addr) 1169 continue; 1170 1171 /* 1172 * If we got a matching prefix route inserted by other 1173 * interface address, we don't need to bother. 1174 */ 1175 return 0; 1176 } 1177 1178 /* 1179 * No one seem to have prefix route; insert it. 1180 */ 1181 error = rtinit(&target->ia_ifa, RTM_ADD, flags); 1182 if (!error) 1183 target->ia_flags |= IFA_ROUTE; 1184 return error; 1185 } 1186 1187 /* 1188 * Remove a route to prefix ("connected route" in cisco terminology). 1189 * Re-installs the route by using another interface address, if there's 1190 * one with the same prefix (otherwise we lose the route mistakenly). 1191 */ 1192 static void 1193 in_scrubprefix(struct in_ifaddr *target) 1194 { 1195 struct in_ifaddr_container *iac; 1196 struct in_addr prefix, mask; 1197 int error; 1198 1199 #ifdef CARP 1200 /* 1201 * Don't scrub prefix routes for CARP interfaces. 1202 * Prefix routes deletion is handled by CARP 1203 * interfaces themselves. 1204 */ 1205 if (target->ia_ifp->if_type == IFT_CARP) 1206 return; 1207 #endif 1208 1209 /* 1210 * Remove or change the loopback route to the interface address. 1211 */ 1212 if (target->ia_addr.sin_addr.s_addr != INADDR_ANY && 1213 (target->ia_ifp->if_flags & IFF_LOOPBACK) == 0) { 1214 struct in_ifaddr *ia; 1215 struct in_addr addr; 1216 1217 /* 1218 * rtrequest1() doesn't yet support to change a route (i.e., 1219 * RTM_CHANGE), so always delete the old one and then add 1220 * the new one if needed. 1221 */ 1222 ifa_del_loopback_route(&target->ia_ifa, 1223 (struct sockaddr *)&target->ia_addr); 1224 1225 /* 1226 * Check whether the host address is still bound to another 1227 * interface address. If yes, then re-add a loopback route 1228 * for it. 1229 */ 1230 addr = target->ia_addr.sin_addr; 1231 LIST_FOREACH(iac, INADDR_HASH(addr.s_addr), ia_hash) { 1232 ia = iac->ia; 1233 if (ia != target && 1234 ia->ia_addr.sin_addr.s_addr == addr.s_addr) { 1235 IFAREF(&ia->ia_ifa); 1236 ifa_add_loopback_route(&ia->ia_ifa, 1237 (struct sockaddr *)&target->ia_addr); 1238 IFAFREE(&ia->ia_ifa); 1239 break; 1240 } 1241 } 1242 } 1243 1244 if ((target->ia_flags & IFA_ROUTE) == 0) 1245 return; 1246 1247 mask = target->ia_sockmask.sin_addr; 1248 if (rtinitflags(target) != 0) { 1249 prefix = target->ia_dstaddr.sin_addr; 1250 } else { 1251 prefix = target->ia_addr.sin_addr; 1252 prefix.s_addr &= mask.s_addr; 1253 } 1254 1255 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) { 1256 struct in_ifaddr *ia = iac->ia; 1257 struct in_addr p; 1258 1259 /* Don't test against self */ 1260 if (ia == target) 1261 continue; 1262 1263 /* The tested address already owns a route entry */ 1264 if (ia->ia_flags & IFA_ROUTE) 1265 continue; 1266 1267 /* 1268 * The prefix route of the tested address should 1269 * never be installed if its parent interface is 1270 * not UP yet. 1271 */ 1272 if ((ia->ia_ifp->if_flags & IFF_UP) == 0) 1273 continue; 1274 1275 #ifdef CARP 1276 /* 1277 * Don't add prefix routes for CARP interfaces. 1278 * Prefix routes creation is handled by CARP 1279 * interfaces themselves. 1280 */ 1281 if (ia->ia_ifp->if_type == IFT_CARP) 1282 continue; 1283 #endif 1284 1285 /* Prefix test */ 1286 if (rtinitflags(ia) != 0) { 1287 p = ia->ia_dstaddr.sin_addr; 1288 } else { 1289 p = ia->ia_addr.sin_addr; 1290 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1291 } 1292 if (prefix.s_addr != p.s_addr) 1293 continue; 1294 1295 /* 1296 * We don't need to test subnetmask here, as what we do 1297 * in in_addprefix(), since if the the tested address's 1298 * parent interface is UP, the tested address should own 1299 * a prefix route entry and we would never reach here. 1300 */ 1301 1302 /* 1303 * If we got a matching prefix route, move IFA_ROUTE to him 1304 */ 1305 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target)); 1306 target->ia_flags &= ~IFA_ROUTE; 1307 1308 error = rtinit(&ia->ia_ifa, RTM_ADD, rtinitflags(ia) | RTF_UP); 1309 if (!error) 1310 ia->ia_flags |= IFA_ROUTE; 1311 return; 1312 } 1313 1314 /* 1315 * No candidates for this prefix route; just remove it. 1316 */ 1317 rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target)); 1318 target->ia_flags &= ~IFA_ROUTE; 1319 } 1320 1321 #undef rtinitflags 1322 1323 /* 1324 * Return 1 if the address might be a local broadcast address. 1325 */ 1326 int 1327 in_broadcast(struct in_addr in, struct ifnet *ifp) 1328 { 1329 struct ifaddr_container *ifac; 1330 u_long t; 1331 1332 if (in.s_addr == INADDR_BROADCAST || 1333 in.s_addr == INADDR_ANY) 1334 return 1; 1335 if (ifp == NULL || (ifp->if_flags & IFF_BROADCAST) == 0) 1336 return 0; 1337 t = ntohl(in.s_addr); 1338 /* 1339 * Look through the list of addresses for a match 1340 * with a broadcast address. 1341 */ 1342 #define ia ((struct in_ifaddr *)ifa) 1343 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1344 struct ifaddr *ifa = ifac->ifa; 1345 1346 if (ifa->ifa_addr->sa_family == AF_INET && 1347 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1348 in.s_addr == ia->ia_netbroadcast.s_addr || 1349 /* 1350 * Check for old-style (host 0) broadcast, but 1351 * taking into account that RFC 3021 obsoletes it. 1352 */ 1353 (ia->ia_subnetmask != IN_RFC3021_MASK && 1354 (t == ia->ia_subnet || t == ia->ia_net))) && 1355 /* 1356 * Check for an all one subnetmask. These 1357 * only exist when an interface gets a secondary 1358 * address. 1359 */ 1360 ia->ia_subnetmask != (u_long)0xffffffff) 1361 return 1; 1362 } 1363 return (0); 1364 #undef ia 1365 } 1366 1367 /* 1368 * Add an address to the list of IP multicast addresses for a given interface. 1369 */ 1370 struct in_multi * 1371 in_addmulti(struct in_addr *ap, struct ifnet *ifp) 1372 { 1373 struct in_multi *inm; 1374 int error; 1375 struct sockaddr_in sin; 1376 struct ifmultiaddr *ifma; 1377 1378 ASSERT_NETISR0; 1379 1380 /* 1381 * Call generic routine to add membership or increment 1382 * refcount. It wants addresses in the form of a sockaddr, 1383 * so we build one here (being careful to zero the unused bytes). 1384 */ 1385 bzero(&sin, sizeof sin); 1386 sin.sin_family = AF_INET; 1387 sin.sin_len = sizeof sin; 1388 sin.sin_addr = *ap; 1389 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 1390 if (error) 1391 return NULL; 1392 1393 /* 1394 * If ifma->ifma_protospec is null, then if_addmulti() created 1395 * a new record. Otherwise, we are done. 1396 */ 1397 if (ifma->ifma_protospec != NULL) 1398 return ifma->ifma_protospec; 1399 1400 inm = kmalloc(sizeof *inm, M_IPMADDR, M_INTWAIT | M_ZERO); 1401 inm->inm_addr = *ap; 1402 inm->inm_ifp = ifp; 1403 inm->inm_ifma = ifma; 1404 ifma->ifma_protospec = inm; 1405 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 1406 1407 /* 1408 * Let IGMP know that we have joined a new IP multicast group. 1409 */ 1410 igmp_joingroup(inm); 1411 return inm; 1412 } 1413 1414 /* 1415 * Delete a multicast address record. 1416 */ 1417 void 1418 in_delmulti(struct in_multi *inm) 1419 { 1420 struct ifmultiaddr *ifma; 1421 struct in_multi my_inm; 1422 1423 ASSERT_NETISR0; 1424 1425 ifma = inm->inm_ifma; 1426 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 1427 if (ifma->ifma_refcount == 1) { 1428 /* 1429 * No remaining claims to this record; let IGMP know that 1430 * we are leaving the multicast group. 1431 * But do it after the if_delmulti() which might reset 1432 * the interface and nuke the packet. 1433 */ 1434 my_inm = *inm ; 1435 ifma->ifma_protospec = NULL; 1436 LIST_REMOVE(inm, inm_link); 1437 kfree(inm, M_IPMADDR); 1438 } 1439 /* XXX - should be separate API for when we have an ifma? */ 1440 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1441 if (my_inm.inm_ifp != NULL) 1442 igmp_leavegroup(&my_inm); 1443 } 1444 1445 void 1446 in_if_down(struct ifnet *ifp) 1447 { 1448 rt_purgecloned(ifp, AF_INET); 1449 } 1450 1451 static void 1452 in_ifdetach_dispatch(netmsg_t nmsg) 1453 { 1454 struct lwkt_msg *lmsg = &nmsg->lmsg; 1455 struct ifnet *ifp = lmsg->u.ms_resultp; 1456 int cpu; 1457 1458 in_pcbpurgeif0(&ripcbinfo, ifp); 1459 for (cpu = 0; cpu < netisr_ncpus; ++cpu) 1460 in_pcbpurgeif0(&udbinfo[cpu], ifp); 1461 1462 lwkt_replymsg(lmsg, 0); 1463 } 1464 1465 void 1466 in_ifdetach(struct ifnet *ifp) 1467 { 1468 struct netmsg_base nmsg; 1469 struct lwkt_msg *lmsg = &nmsg.lmsg; 1470 1471 netmsg_init(&nmsg, NULL, &curthread->td_msgport, 0, 1472 in_ifdetach_dispatch); 1473 lmsg->u.ms_resultp = ifp; 1474 1475 lwkt_domsg(netisr_cpuport(0), lmsg, 0); 1476 } 1477