1 /* 2 * Copyright (c) 1982, 1986, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)in.c 8.4 (Berkeley) 1/9/95 34 * $FreeBSD: src/sys/netinet/in.c,v 1.44.2.14 2002/11/08 00:45:50 suz Exp $ 35 * $DragonFly: src/sys/netinet/in.c,v 1.41 2008/08/17 05:20:10 sephe Exp $ 36 */ 37 38 #include "opt_bootp.h" 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/sockio.h> 43 #include <sys/malloc.h> 44 #include <sys/proc.h> 45 #include <sys/msgport.h> 46 #include <sys/socket.h> 47 48 #include <sys/kernel.h> 49 #include <sys/sysctl.h> 50 #include <sys/thread2.h> 51 52 #include <net/if.h> 53 #include <net/if_types.h> 54 #include <net/route.h> 55 #include <net/netmsg2.h> 56 57 #include <netinet/in.h> 58 #include <netinet/in_var.h> 59 #include <netinet/in_pcb.h> 60 61 #include <netinet/igmp_var.h> 62 63 MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address"); 64 65 static int in_mask2len (struct in_addr *); 66 static void in_len2mask (struct in_addr *, int); 67 static int in_lifaddr_ioctl (struct socket *, u_long, caddr_t, 68 struct ifnet *, struct thread *); 69 70 static void in_socktrim (struct sockaddr_in *); 71 static int in_ifinit(struct ifnet *, struct in_ifaddr *, 72 const struct sockaddr_in *, int); 73 74 static void in_control_dispatch(struct netmsg *); 75 static int in_control_internal(u_long, caddr_t, struct ifnet *, 76 struct thread *); 77 78 static int subnetsarelocal = 0; 79 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 80 &subnetsarelocal, 0, ""); 81 82 struct in_multihead in_multihead; /* XXX BSS initialization */ 83 84 extern struct inpcbinfo ripcbinfo; 85 extern struct inpcbinfo udbinfo; 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 static int in_interfaces; /* number of external internet interfaces */ 192 193 struct in_control_arg { 194 u_long cmd; 195 caddr_t data; 196 struct ifnet *ifp; 197 struct thread *td; 198 }; 199 200 static void 201 in_control_dispatch(struct netmsg *nmsg) 202 { 203 struct lwkt_msg *msg = &nmsg->nm_lmsg; 204 const struct in_control_arg *arg = msg->u.ms_resultp; 205 int error; 206 207 error = in_control_internal(arg->cmd, arg->data, arg->ifp, arg->td); 208 lwkt_replymsg(msg, error); 209 } 210 211 /* 212 * Generic internet control operations (ioctl's). 213 * Ifp is 0 if not an interface-specific ioctl. 214 * 215 * NOTE! td might be NULL. 216 */ 217 /* ARGSUSED */ 218 int 219 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 220 struct thread *td) 221 { 222 struct netmsg nmsg; 223 struct in_control_arg arg; 224 struct lwkt_msg *msg; 225 int error; 226 227 switch (cmd) { 228 case SIOCALIFADDR: 229 case SIOCDLIFADDR: 230 if (td && (error = suser(td)) != 0) 231 return error; 232 /* FALLTHROUGH */ 233 case SIOCGLIFADDR: 234 if (!ifp) 235 return EINVAL; 236 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 237 } 238 239 KASSERT(cmd != SIOCALIFADDR && cmd != SIOCDLIFADDR, 240 ("recursive SIOC%cLIFADDR!\n", 241 cmd == SIOCDLIFADDR ? 'D' : 'A')); 242 243 /* 244 * IFADDR alterations are serialized by netisr0 245 */ 246 switch (cmd) { 247 case SIOCSIFDSTADDR: 248 case SIOCSIFBRDADDR: 249 case SIOCSIFADDR: 250 case SIOCSIFNETMASK: 251 case SIOCAIFADDR: 252 case SIOCDIFADDR: 253 bzero(&arg, sizeof(arg)); 254 arg.cmd = cmd; 255 arg.data = data; 256 arg.ifp = ifp; 257 arg.td = td; 258 259 netmsg_init(&nmsg, &curthread->td_msgport, 0, 260 in_control_dispatch); 261 msg = &nmsg.nm_lmsg; 262 msg->u.ms_resultp = &arg; 263 264 lwkt_domsg(cpu_portfn(0), msg, 0); 265 return msg->ms_error; 266 default: 267 return in_control_internal(cmd, data, ifp, td); 268 } 269 } 270 271 static void 272 in_ialink_dispatch(struct netmsg *nmsg) 273 { 274 struct lwkt_msg *lmsg = &nmsg->nm_lmsg; 275 struct in_ifaddr *ia = lmsg->u.ms_resultp; 276 struct ifaddr_container *ifac; 277 struct in_ifaddr_container *iac; 278 int cpu = mycpuid; 279 280 crit_enter(); 281 282 ifac = &ia->ia_ifa.ifa_containers[cpu]; 283 ASSERT_IFAC_VALID(ifac); 284 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD) == 0, 285 ("ia is on in_ifaddrheads\n")); 286 287 ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHEAD; 288 iac = &ifac->ifa_proto_u.u_in_ifac; 289 TAILQ_INSERT_TAIL(&in_ifaddrheads[cpu], iac, ia_link); 290 291 crit_exit(); 292 293 ifa_forwardmsg(lmsg, cpu + 1); 294 } 295 296 static void 297 in_iaunlink_dispatch(struct netmsg *nmsg) 298 { 299 struct lwkt_msg *lmsg = &nmsg->nm_lmsg; 300 struct in_ifaddr *ia = lmsg->u.ms_resultp; 301 struct ifaddr_container *ifac; 302 struct in_ifaddr_container *iac; 303 int cpu = mycpuid; 304 305 crit_enter(); 306 307 ifac = &ia->ia_ifa.ifa_containers[cpu]; 308 ASSERT_IFAC_VALID(ifac); 309 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD, 310 ("ia is not on in_ifaddrheads\n")); 311 312 iac = &ifac->ifa_proto_u.u_in_ifac; 313 TAILQ_REMOVE(&in_ifaddrheads[cpu], iac, ia_link); 314 ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHEAD; 315 316 crit_exit(); 317 318 ifa_forwardmsg(lmsg, cpu + 1); 319 } 320 321 static void 322 in_iahashins_dispatch(struct netmsg *nmsg) 323 { 324 struct lwkt_msg *lmsg = &nmsg->nm_lmsg; 325 struct in_ifaddr *ia = lmsg->u.ms_resultp; 326 struct ifaddr_container *ifac; 327 struct in_ifaddr_container *iac; 328 int cpu = mycpuid; 329 330 crit_enter(); 331 332 ifac = &ia->ia_ifa.ifa_containers[cpu]; 333 ASSERT_IFAC_VALID(ifac); 334 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0, 335 ("ia is on in_ifaddrhashtbls\n")); 336 337 ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHASH; 338 iac = &ifac->ifa_proto_u.u_in_ifac; 339 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 340 iac, ia_hash); 341 342 crit_exit(); 343 344 ifa_forwardmsg(lmsg, cpu + 1); 345 } 346 347 static void 348 in_iahashrem_dispatch(struct netmsg *nmsg) 349 { 350 struct lwkt_msg *lmsg = &nmsg->nm_lmsg; 351 struct in_ifaddr *ia = lmsg->u.ms_resultp; 352 struct ifaddr_container *ifac; 353 struct in_ifaddr_container *iac; 354 int cpu = mycpuid; 355 356 crit_enter(); 357 358 ifac = &ia->ia_ifa.ifa_containers[cpu]; 359 ASSERT_IFAC_VALID(ifac); 360 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH, 361 ("ia is not on in_ifaddrhashtbls\n")); 362 363 iac = &ifac->ifa_proto_u.u_in_ifac; 364 LIST_REMOVE(iac, ia_hash); 365 ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHASH; 366 367 crit_exit(); 368 369 ifa_forwardmsg(lmsg, cpu + 1); 370 } 371 372 static void 373 in_ialink(struct in_ifaddr *ia) 374 { 375 struct netmsg nmsg; 376 struct lwkt_msg *lmsg; 377 378 netmsg_init(&nmsg, &curthread->td_msgport, 0, in_ialink_dispatch); 379 lmsg = &nmsg.nm_lmsg; 380 lmsg->u.ms_resultp = ia; 381 382 ifa_domsg(lmsg, 0); 383 } 384 385 void 386 in_iaunlink(struct in_ifaddr *ia) 387 { 388 struct netmsg nmsg; 389 struct lwkt_msg *lmsg; 390 391 netmsg_init(&nmsg, &curthread->td_msgport, 0, in_iaunlink_dispatch); 392 lmsg = &nmsg.nm_lmsg; 393 lmsg->u.ms_resultp = ia; 394 395 ifa_domsg(lmsg, 0); 396 } 397 398 void 399 in_iahash_insert(struct in_ifaddr *ia) 400 { 401 struct netmsg nmsg; 402 struct lwkt_msg *lmsg; 403 404 netmsg_init(&nmsg, &curthread->td_msgport, 0, in_iahashins_dispatch); 405 lmsg = &nmsg.nm_lmsg; 406 lmsg->u.ms_resultp = ia; 407 408 ifa_domsg(lmsg, 0); 409 } 410 411 void 412 in_iahash_remove(struct in_ifaddr *ia) 413 { 414 struct netmsg nmsg; 415 struct lwkt_msg *lmsg; 416 417 netmsg_init(&nmsg, &curthread->td_msgport, 0, in_iahashrem_dispatch); 418 lmsg = &nmsg.nm_lmsg; 419 lmsg->u.ms_resultp = ia; 420 421 ifa_domsg(lmsg, 0); 422 } 423 424 static __inline struct in_ifaddr * 425 in_ianext(struct in_ifaddr *oia) 426 { 427 struct ifaddr_container *ifac; 428 struct in_ifaddr_container *iac; 429 430 ifac = &oia->ia_ifa.ifa_containers[mycpuid]; 431 ASSERT_IFAC_VALID(ifac); 432 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD, 433 ("ia is not on in_ifaddrheads\n")); 434 435 iac = &ifac->ifa_proto_u.u_in_ifac; 436 iac = TAILQ_NEXT(iac, ia_link); 437 if (iac != NULL) 438 return iac->ia; 439 else 440 return NULL; 441 } 442 443 static int 444 in_control_internal(u_long cmd, caddr_t data, struct ifnet *ifp, 445 struct thread *td) 446 { 447 struct ifreq *ifr = (struct ifreq *)data; 448 struct in_ifaddr *ia = NULL; 449 struct in_addr dst; 450 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 451 struct ifaddr_container *ifac; 452 struct in_ifaddr_container *iac; 453 struct sockaddr_in oldaddr; 454 int hostIsNew, iaIsNew, maskIsNew; 455 int error = 0; 456 457 iaIsNew = 0; 458 459 /* 460 * Find address for this interface, if it exists. 461 * 462 * If an alias address was specified, find that one instead of 463 * the first one on the interface, if possible 464 */ 465 if (ifp) { 466 struct in_ifaddr *iap; 467 468 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 469 LIST_FOREACH(iac, INADDR_HASH(dst.s_addr), ia_hash) { 470 iap = iac->ia; 471 if (iap->ia_ifp == ifp && 472 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 473 ia = iap; 474 break; 475 } 476 } 477 if (ia == NULL) { 478 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], 479 ifa_link) { 480 iap = ifatoia(ifac->ifa); 481 if (iap->ia_addr.sin_family == AF_INET) { 482 ia = iap; 483 break; 484 } 485 } 486 } 487 } 488 489 switch (cmd) { 490 case SIOCAIFADDR: 491 case SIOCDIFADDR: 492 if (ifp == NULL) 493 return (EADDRNOTAVAIL); 494 if (ifra->ifra_addr.sin_family == AF_INET) { 495 while (ia != NULL) { 496 if (ia->ia_ifp == ifp && 497 ia->ia_addr.sin_addr.s_addr == 498 ifra->ifra_addr.sin_addr.s_addr) 499 break; 500 ia = in_ianext(ia); 501 } 502 if ((ifp->if_flags & IFF_POINTOPOINT) && 503 cmd == SIOCAIFADDR && 504 ifra->ifra_dstaddr.sin_addr.s_addr == INADDR_ANY) { 505 return EDESTADDRREQ; 506 } 507 } 508 if (cmd == SIOCDIFADDR && ia == NULL) 509 return (EADDRNOTAVAIL); 510 /* FALLTHROUGH */ 511 case SIOCSIFADDR: 512 case SIOCSIFNETMASK: 513 case SIOCSIFDSTADDR: 514 if (td && (error = suser(td)) != 0) 515 return error; 516 517 if (ifp == NULL) 518 return (EADDRNOTAVAIL); 519 520 if (cmd == SIOCSIFDSTADDR && 521 (ifp->if_flags & IFF_POINTOPOINT) == 0) 522 return (EINVAL); 523 524 if (ia == NULL) { 525 struct ifaddr *ifa; 526 int i; 527 528 ia = ifa_create(sizeof(*ia), M_WAITOK); 529 ifa = &ia->ia_ifa; 530 531 /* 532 * Setup per-CPU information 533 */ 534 for (i = 0; i < ncpus; ++i) { 535 ifac = &ifa->ifa_containers[i]; 536 iac = &ifac->ifa_proto_u.u_in_ifac; 537 iac->ia = ia; 538 iac->ia_ifac = ifac; 539 } 540 541 /* 542 * Protect from NETISR_IP traversing address list 543 * while we're modifying it. 544 */ 545 crit_enter(); 546 547 in_ialink(ia); 548 ifa_iflink(ifa, ifp, 1); 549 550 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 551 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 552 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 553 ia->ia_sockmask.sin_len = 8; 554 ia->ia_sockmask.sin_family = AF_INET; 555 if (ifp->if_flags & IFF_BROADCAST) { 556 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr; 557 ia->ia_broadaddr.sin_family = AF_INET; 558 } 559 ia->ia_ifp = ifp; 560 if (!(ifp->if_flags & IFF_LOOPBACK)) 561 in_interfaces++; 562 iaIsNew = 1; 563 564 crit_exit(); 565 } 566 break; 567 568 case SIOCSIFBRDADDR: 569 if (td && (error = suser(td)) != 0) 570 return error; 571 /* FALLTHROUGH */ 572 573 case SIOCGIFADDR: 574 case SIOCGIFNETMASK: 575 case SIOCGIFDSTADDR: 576 case SIOCGIFBRDADDR: 577 if (ia == NULL) 578 return (EADDRNOTAVAIL); 579 break; 580 } 581 582 switch (cmd) { 583 case SIOCGIFADDR: 584 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 585 return (0); 586 587 case SIOCGIFBRDADDR: 588 if ((ifp->if_flags & IFF_BROADCAST) == 0) 589 return (EINVAL); 590 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 591 return (0); 592 593 case SIOCGIFDSTADDR: 594 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 595 return (EINVAL); 596 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 597 return (0); 598 599 case SIOCGIFNETMASK: 600 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 601 return (0); 602 603 case SIOCSIFDSTADDR: 604 KKASSERT(ifp->if_flags & IFF_POINTOPOINT); 605 606 oldaddr = ia->ia_dstaddr; 607 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 608 if (ifp->if_ioctl != NULL) { 609 lwkt_serialize_enter(ifp->if_serializer); 610 error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia, 611 td->td_proc->p_ucred); 612 lwkt_serialize_exit(ifp->if_serializer); 613 if (error) { 614 ia->ia_dstaddr = oldaddr; 615 return (error); 616 } 617 } 618 if (ia->ia_flags & IFA_ROUTE) { 619 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 620 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 621 ia->ia_ifa.ifa_dstaddr = 622 (struct sockaddr *)&ia->ia_dstaddr; 623 rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP); 624 } 625 return (0); 626 627 case SIOCSIFBRDADDR: 628 if ((ifp->if_flags & IFF_BROADCAST) == 0) 629 return (EINVAL); 630 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 631 return (0); 632 633 case SIOCSIFADDR: 634 error = in_ifinit(ifp, ia, 635 (const struct sockaddr_in *)&ifr->ifr_addr, 1); 636 if (error != 0 && iaIsNew) 637 break; 638 if (error == 0) { 639 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 640 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 641 &ia->ia_ifa); 642 } 643 return (0); 644 645 case SIOCSIFNETMASK: 646 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 647 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 648 return (0); 649 650 case SIOCAIFADDR: 651 maskIsNew = 0; 652 hostIsNew = 1; 653 error = 0; 654 if (ia->ia_addr.sin_family == AF_INET) { 655 if (ifra->ifra_addr.sin_len == 0) { 656 ifra->ifra_addr = ia->ia_addr; 657 hostIsNew = 0; 658 } else if (ifra->ifra_addr.sin_addr.s_addr == 659 ia->ia_addr.sin_addr.s_addr) { 660 hostIsNew = 0; 661 } 662 } 663 if (ifra->ifra_mask.sin_len) { 664 in_ifscrub(ifp, ia); 665 ia->ia_sockmask = ifra->ifra_mask; 666 ia->ia_sockmask.sin_family = AF_INET; 667 ia->ia_subnetmask = 668 ntohl(ia->ia_sockmask.sin_addr.s_addr); 669 maskIsNew = 1; 670 } 671 if ((ifp->if_flags & IFF_POINTOPOINT) && 672 ifra->ifra_dstaddr.sin_family == AF_INET) { 673 in_ifscrub(ifp, ia); 674 ia->ia_dstaddr = ifra->ifra_dstaddr; 675 maskIsNew = 1; /* We lie; but the effect's the same */ 676 } 677 if (ifra->ifra_addr.sin_family == AF_INET && 678 (hostIsNew || maskIsNew)) 679 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 680 681 if (error != 0 && iaIsNew) 682 break; 683 684 if ((ifp->if_flags & IFF_BROADCAST) && 685 ifra->ifra_broadaddr.sin_family == AF_INET) 686 ia->ia_broadaddr = ifra->ifra_broadaddr; 687 if (error == 0) { 688 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 689 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 690 &ia->ia_ifa); 691 } 692 return (error); 693 694 case SIOCDIFADDR: 695 /* 696 * in_ifscrub kills the interface route. 697 */ 698 in_ifscrub(ifp, ia); 699 /* 700 * in_ifadown gets rid of all the rest of 701 * the routes. This is not quite the right 702 * thing to do, but at least if we are running 703 * a routing process they will come back. 704 */ 705 in_ifadown(&ia->ia_ifa, 1); 706 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE, 707 &ia->ia_ifa); 708 error = 0; 709 break; 710 711 default: 712 if (ifp == NULL || ifp->if_ioctl == NULL) 713 return (EOPNOTSUPP); 714 lwkt_serialize_enter(ifp->if_serializer); 715 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred); 716 lwkt_serialize_exit(ifp->if_serializer); 717 return (error); 718 } 719 720 KKASSERT(cmd == SIOCDIFADDR || 721 ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && iaIsNew)); 722 723 ifa_ifunlink(&ia->ia_ifa, ifp); 724 in_iaunlink(ia); 725 726 if (cmd == SIOCDIFADDR) { 727 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 728 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) 729 in_iahash_remove(ia); 730 } 731 #ifdef INVARIANTS 732 else { 733 /* 734 * If cmd is SIOCSIFADDR or SIOCAIFADDR, in_ifinit() has 735 * already taken care of the deletion from hash table 736 */ 737 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 738 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0, 739 ("SIOC%cIFADDR failed on new ia, " 740 "but the new ia is still in hash table\n", 741 cmd == SIOCSIFADDR ? 'S' : 'A')); 742 } 743 #endif 744 745 ifa_destroy(&ia->ia_ifa); 746 747 return (error); 748 } 749 750 /* 751 * SIOC[GAD]LIFADDR. 752 * SIOCGLIFADDR: get first address. (?!?) 753 * SIOCGLIFADDR with IFLR_PREFIX: 754 * get first address that matches the specified prefix. 755 * SIOCALIFADDR: add the specified address. 756 * SIOCALIFADDR with IFLR_PREFIX: 757 * EINVAL since we can't deduce hostid part of the address. 758 * SIOCDLIFADDR: delete the specified address. 759 * SIOCDLIFADDR with IFLR_PREFIX: 760 * delete the first address that matches the specified prefix. 761 * return values: 762 * EINVAL on invalid parameters 763 * EADDRNOTAVAIL on prefix match failed/specified address not found 764 * other values may be returned from in_ioctl() 765 * 766 * NOTE! td might be NULL. 767 */ 768 static int 769 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 770 struct thread *td) 771 { 772 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 773 774 /* sanity checks */ 775 if (!data || !ifp) { 776 panic("invalid argument to in_lifaddr_ioctl"); 777 /*NOTRECHED*/ 778 } 779 780 switch (cmd) { 781 case SIOCGLIFADDR: 782 /* address must be specified on GET with IFLR_PREFIX */ 783 if ((iflr->flags & IFLR_PREFIX) == 0) 784 break; 785 /*FALLTHROUGH*/ 786 case SIOCALIFADDR: 787 case SIOCDLIFADDR: 788 /* address must be specified on ADD and DELETE */ 789 if (iflr->addr.ss_family != AF_INET) 790 return EINVAL; 791 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 792 return EINVAL; 793 /* XXX need improvement */ 794 if (iflr->dstaddr.ss_family 795 && iflr->dstaddr.ss_family != AF_INET) 796 return EINVAL; 797 if (iflr->dstaddr.ss_family 798 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 799 return EINVAL; 800 break; 801 default: /*shouldn't happen*/ 802 return EOPNOTSUPP; 803 } 804 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 805 return EINVAL; 806 807 switch (cmd) { 808 case SIOCALIFADDR: 809 { 810 struct in_aliasreq ifra; 811 812 if (iflr->flags & IFLR_PREFIX) 813 return EINVAL; 814 815 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 816 bzero(&ifra, sizeof ifra); 817 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name); 818 819 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 820 821 if (iflr->dstaddr.ss_family) { /*XXX*/ 822 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 823 iflr->dstaddr.ss_len); 824 } 825 826 ifra.ifra_mask.sin_family = AF_INET; 827 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 828 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 829 830 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 831 } 832 case SIOCGLIFADDR: 833 case SIOCDLIFADDR: 834 { 835 struct ifaddr_container *ifac; 836 struct in_ifaddr *ia; 837 struct in_addr mask, candidate, match; 838 struct sockaddr_in *sin; 839 int cmp; 840 841 bzero(&mask, sizeof mask); 842 if (iflr->flags & IFLR_PREFIX) { 843 /* lookup a prefix rather than address. */ 844 in_len2mask(&mask, iflr->prefixlen); 845 846 sin = (struct sockaddr_in *)&iflr->addr; 847 match.s_addr = sin->sin_addr.s_addr; 848 match.s_addr &= mask.s_addr; 849 850 /* if you set extra bits, that's wrong */ 851 if (match.s_addr != sin->sin_addr.s_addr) 852 return EINVAL; 853 854 cmp = 1; 855 } else { 856 if (cmd == SIOCGLIFADDR) { 857 /* on getting an address, take the 1st match */ 858 match.s_addr = 0; /* gcc4 warning */ 859 cmp = 0; /*XXX*/ 860 } else { 861 /* on deleting an address, do exact match */ 862 in_len2mask(&mask, 32); 863 sin = (struct sockaddr_in *)&iflr->addr; 864 match.s_addr = sin->sin_addr.s_addr; 865 866 cmp = 1; 867 } 868 } 869 870 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 871 struct ifaddr *ifa = ifac->ifa; 872 873 if (ifa->ifa_addr->sa_family != AF_INET6) 874 continue; 875 if (!cmp) 876 break; 877 candidate.s_addr = 878 ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 879 candidate.s_addr &= mask.s_addr; 880 if (candidate.s_addr == match.s_addr) 881 break; 882 } 883 if (ifac == NULL) 884 return EADDRNOTAVAIL; 885 ia = (struct in_ifaddr *)(ifac->ifa); 886 887 if (cmd == SIOCGLIFADDR) { 888 /* fill in the if_laddrreq structure */ 889 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 890 891 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 892 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 893 ia->ia_dstaddr.sin_len); 894 } else 895 bzero(&iflr->dstaddr, sizeof iflr->dstaddr); 896 897 iflr->prefixlen = 898 in_mask2len(&ia->ia_sockmask.sin_addr); 899 900 iflr->flags = 0; /*XXX*/ 901 902 return 0; 903 } else { 904 struct in_aliasreq ifra; 905 906 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 907 bzero(&ifra, sizeof ifra); 908 bcopy(iflr->iflr_name, ifra.ifra_name, 909 sizeof ifra.ifra_name); 910 911 bcopy(&ia->ia_addr, &ifra.ifra_addr, 912 ia->ia_addr.sin_len); 913 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 914 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 915 ia->ia_dstaddr.sin_len); 916 } 917 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 918 ia->ia_sockmask.sin_len); 919 920 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 921 ifp, td); 922 } 923 } 924 } 925 926 return EOPNOTSUPP; /*just for safety*/ 927 } 928 929 /* 930 * Delete any existing route for an interface. 931 */ 932 void 933 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia) 934 { 935 936 if ((ia->ia_flags & IFA_ROUTE) == 0) 937 return; 938 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) 939 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 940 else 941 rtinit(&ia->ia_ifa, RTM_DELETE, 0); 942 ia->ia_flags &= ~IFA_ROUTE; 943 } 944 945 /* 946 * Initialize an interface's internet address 947 * and routing table entry. 948 */ 949 static int 950 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, 951 const struct sockaddr_in *sin, int scrub) 952 { 953 u_long i = ntohl(sin->sin_addr.s_addr); 954 struct sockaddr_in oldaddr; 955 struct ifaddr_container *ifac; 956 int flags = RTF_UP, error = 0; 957 int was_hash = 0; 958 959 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 960 oldaddr = ia->ia_addr; 961 962 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) { 963 was_hash = 1; 964 in_iahash_remove(ia); 965 } 966 967 ia->ia_addr = *sin; 968 if (ia->ia_addr.sin_family == AF_INET) 969 in_iahash_insert(ia); 970 971 /* 972 * Give the interface a chance to initialize 973 * if this is its first address, 974 * and to validate the address if necessary. 975 */ 976 if (ifp->if_ioctl != NULL) { 977 lwkt_serialize_enter(ifp->if_serializer); 978 error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL); 979 lwkt_serialize_exit(ifp->if_serializer); 980 if (error) 981 goto fail; 982 } 983 984 /* 985 * Delete old route, if requested. 986 */ 987 if (scrub) { 988 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 989 in_ifscrub(ifp, ia); 990 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 991 } 992 993 /* 994 * Calculate netmask/subnetmask. 995 */ 996 if (IN_CLASSA(i)) 997 ia->ia_netmask = IN_CLASSA_NET; 998 else if (IN_CLASSB(i)) 999 ia->ia_netmask = IN_CLASSB_NET; 1000 else 1001 ia->ia_netmask = IN_CLASSC_NET; 1002 /* 1003 * The subnet mask usually includes at least the standard network part, 1004 * but may may be smaller in the case of supernetting. 1005 * If it is set, we believe it. 1006 */ 1007 if (ia->ia_subnetmask == 0) { 1008 ia->ia_subnetmask = ia->ia_netmask; 1009 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 1010 } else { 1011 ia->ia_netmask &= ia->ia_subnetmask; 1012 } 1013 ia->ia_net = i & ia->ia_netmask; 1014 ia->ia_subnet = i & ia->ia_subnetmask; 1015 in_socktrim(&ia->ia_sockmask); 1016 1017 /* 1018 * Add route for the network. 1019 */ 1020 ia->ia_ifa.ifa_metric = ifp->if_metric; 1021 if (ifp->if_flags & IFF_BROADCAST) { 1022 ia->ia_broadaddr.sin_addr.s_addr = 1023 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 1024 ia->ia_netbroadcast.s_addr = 1025 htonl(ia->ia_net | ~ ia->ia_netmask); 1026 } else if (ifp->if_flags & IFF_LOOPBACK) { 1027 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr; 1028 flags |= RTF_HOST; 1029 } else if (ifp->if_flags & IFF_POINTOPOINT) { 1030 if (ia->ia_dstaddr.sin_family != AF_INET) 1031 return (0); 1032 flags |= RTF_HOST; 1033 } 1034 1035 /*- 1036 * Don't add host routes for interface addresses of 1037 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it 1038 * possible to assign several such address pairs with consistent 1039 * results (no host route) and is required by BOOTP. 1040 * 1041 * XXX: This is ugly ! There should be a way for the caller to 1042 * say that they don't want a host route. 1043 */ 1044 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY || 1045 ia->ia_netmask != IN_CLASSA_NET || 1046 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) { 1047 if ((error = rtinit(&ia->ia_ifa, RTM_ADD, flags)) != 0) { 1048 if (error != EEXIST || 1049 !(ifac->ifa_prflags & IA_PRF_RTEXISTOK)) 1050 goto fail; 1051 } else { 1052 ia->ia_flags |= IFA_ROUTE; 1053 } 1054 } 1055 1056 /* 1057 * If the interface supports multicast, join the "all hosts" 1058 * multicast group on that interface. 1059 */ 1060 if (ifp->if_flags & IFF_MULTICAST) { 1061 struct in_addr addr; 1062 1063 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 1064 in_addmulti(&addr, ifp); 1065 } 1066 return (0); 1067 fail: 1068 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) 1069 in_iahash_remove(ia); 1070 1071 ia->ia_addr = oldaddr; 1072 if (was_hash) 1073 in_iahash_insert(ia); 1074 return (error); 1075 } 1076 1077 1078 /* 1079 * Return 1 if the address might be a local broadcast address. 1080 */ 1081 int 1082 in_broadcast(struct in_addr in, struct ifnet *ifp) 1083 { 1084 struct ifaddr_container *ifac; 1085 u_long t; 1086 1087 if (in.s_addr == INADDR_BROADCAST || 1088 in.s_addr == INADDR_ANY) 1089 return 1; 1090 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1091 return 0; 1092 t = ntohl(in.s_addr); 1093 /* 1094 * Look through the list of addresses for a match 1095 * with a broadcast address. 1096 */ 1097 #define ia ((struct in_ifaddr *)ifa) 1098 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1099 struct ifaddr *ifa = ifac->ifa; 1100 1101 if (ifa->ifa_addr->sa_family == AF_INET && 1102 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1103 in.s_addr == ia->ia_netbroadcast.s_addr || 1104 /* 1105 * Check for old-style (host 0) broadcast. 1106 */ 1107 t == ia->ia_subnet || t == ia->ia_net) && 1108 /* 1109 * Check for an all one subnetmask. These 1110 * only exist when an interface gets a secondary 1111 * address. 1112 */ 1113 ia->ia_subnetmask != (u_long)0xffffffff) 1114 return 1; 1115 } 1116 return (0); 1117 #undef ia 1118 } 1119 /* 1120 * Add an address to the list of IP multicast addresses for a given interface. 1121 */ 1122 struct in_multi * 1123 in_addmulti(struct in_addr *ap, struct ifnet *ifp) 1124 { 1125 struct in_multi *inm; 1126 int error; 1127 struct sockaddr_in sin; 1128 struct ifmultiaddr *ifma; 1129 1130 /* 1131 * Call generic routine to add membership or increment 1132 * refcount. It wants addresses in the form of a sockaddr, 1133 * so we build one here (being careful to zero the unused bytes). 1134 */ 1135 bzero(&sin, sizeof sin); 1136 sin.sin_family = AF_INET; 1137 sin.sin_len = sizeof sin; 1138 sin.sin_addr = *ap; 1139 crit_enter(); 1140 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 1141 if (error) { 1142 crit_exit(); 1143 return 0; 1144 } 1145 1146 /* 1147 * If ifma->ifma_protospec is null, then if_addmulti() created 1148 * a new record. Otherwise, we are done. 1149 */ 1150 if (ifma->ifma_protospec != 0) { 1151 crit_exit(); 1152 return ifma->ifma_protospec; 1153 } 1154 1155 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 1156 at interrupt time? If so, need to fix if_addmulti. XXX */ 1157 inm = kmalloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO); 1158 inm->inm_addr = *ap; 1159 inm->inm_ifp = ifp; 1160 inm->inm_ifma = ifma; 1161 ifma->ifma_protospec = inm; 1162 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 1163 1164 /* 1165 * Let IGMP know that we have joined a new IP multicast group. 1166 */ 1167 igmp_joingroup(inm); 1168 crit_exit(); 1169 return (inm); 1170 } 1171 1172 /* 1173 * Delete a multicast address record. 1174 */ 1175 void 1176 in_delmulti(struct in_multi *inm) 1177 { 1178 struct ifmultiaddr *ifma; 1179 struct in_multi my_inm; 1180 1181 crit_enter(); 1182 ifma = inm->inm_ifma; 1183 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 1184 if (ifma->ifma_refcount == 1) { 1185 /* 1186 * No remaining claims to this record; let IGMP know that 1187 * we are leaving the multicast group. 1188 * But do it after the if_delmulti() which might reset 1189 * the interface and nuke the packet. 1190 */ 1191 my_inm = *inm ; 1192 ifma->ifma_protospec = 0; 1193 LIST_REMOVE(inm, inm_link); 1194 kfree(inm, M_IPMADDR); 1195 } 1196 /* XXX - should be separate API for when we have an ifma? */ 1197 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1198 if (my_inm.inm_ifp != NULL) 1199 igmp_leavegroup(&my_inm); 1200 crit_exit(); 1201 } 1202 1203 void 1204 in_ifdetach(struct ifnet *ifp) 1205 { 1206 in_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp); 1207 in_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp); 1208 } 1209