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 1.40 2008/06/14 08:40:16 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); 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); 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); 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); 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 return (0); 641 642 case SIOCSIFNETMASK: 643 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 644 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 645 return (0); 646 647 case SIOCAIFADDR: 648 maskIsNew = 0; 649 hostIsNew = 1; 650 error = 0; 651 if (ia->ia_addr.sin_family == AF_INET) { 652 if (ifra->ifra_addr.sin_len == 0) { 653 ifra->ifra_addr = ia->ia_addr; 654 hostIsNew = 0; 655 } else if (ifra->ifra_addr.sin_addr.s_addr == 656 ia->ia_addr.sin_addr.s_addr) { 657 hostIsNew = 0; 658 } 659 } 660 if (ifra->ifra_mask.sin_len) { 661 in_ifscrub(ifp, ia); 662 ia->ia_sockmask = ifra->ifra_mask; 663 ia->ia_sockmask.sin_family = AF_INET; 664 ia->ia_subnetmask = 665 ntohl(ia->ia_sockmask.sin_addr.s_addr); 666 maskIsNew = 1; 667 } 668 if ((ifp->if_flags & IFF_POINTOPOINT) && 669 ifra->ifra_dstaddr.sin_family == AF_INET) { 670 in_ifscrub(ifp, ia); 671 ia->ia_dstaddr = ifra->ifra_dstaddr; 672 maskIsNew = 1; /* We lie; but the effect's the same */ 673 } 674 if (ifra->ifra_addr.sin_family == AF_INET && 675 (hostIsNew || maskIsNew)) 676 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 677 678 if (error != 0 && iaIsNew) 679 break; 680 681 if ((ifp->if_flags & IFF_BROADCAST) && 682 ifra->ifra_broadaddr.sin_family == AF_INET) 683 ia->ia_broadaddr = ifra->ifra_broadaddr; 684 if (error == 0) 685 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 686 return (error); 687 688 case SIOCDIFADDR: 689 /* 690 * in_ifscrub kills the interface route. 691 */ 692 in_ifscrub(ifp, ia); 693 /* 694 * in_ifadown gets rid of all the rest of 695 * the routes. This is not quite the right 696 * thing to do, but at least if we are running 697 * a routing process they will come back. 698 */ 699 in_ifadown(&ia->ia_ifa, 1); 700 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 701 error = 0; 702 break; 703 704 default: 705 if (ifp == NULL || ifp->if_ioctl == NULL) 706 return (EOPNOTSUPP); 707 lwkt_serialize_enter(ifp->if_serializer); 708 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred); 709 lwkt_serialize_exit(ifp->if_serializer); 710 return (error); 711 } 712 713 KKASSERT(cmd == SIOCDIFADDR || 714 ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && iaIsNew)); 715 716 ifa_ifunlink(&ia->ia_ifa, ifp); 717 in_iaunlink(ia); 718 719 if (cmd == SIOCDIFADDR) { 720 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 721 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) 722 in_iahash_remove(ia); 723 } 724 #ifdef INVARIANTS 725 else { 726 /* 727 * If cmd is SIOCSIFADDR or SIOCAIFADDR, in_ifinit() has 728 * already taken care of the deletion from hash table 729 */ 730 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 731 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0, 732 ("SIOC%cIFADDR failed on new ia, " 733 "but the new ia is still in hash table\n", 734 cmd == SIOCSIFADDR ? 'S' : 'A')); 735 } 736 #endif 737 738 ifa_destroy(&ia->ia_ifa); 739 740 return (error); 741 } 742 743 /* 744 * SIOC[GAD]LIFADDR. 745 * SIOCGLIFADDR: get first address. (?!?) 746 * SIOCGLIFADDR with IFLR_PREFIX: 747 * get first address that matches the specified prefix. 748 * SIOCALIFADDR: add the specified address. 749 * SIOCALIFADDR with IFLR_PREFIX: 750 * EINVAL since we can't deduce hostid part of the address. 751 * SIOCDLIFADDR: delete the specified address. 752 * SIOCDLIFADDR with IFLR_PREFIX: 753 * delete the first address that matches the specified prefix. 754 * return values: 755 * EINVAL on invalid parameters 756 * EADDRNOTAVAIL on prefix match failed/specified address not found 757 * other values may be returned from in_ioctl() 758 * 759 * NOTE! td might be NULL. 760 */ 761 static int 762 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 763 struct thread *td) 764 { 765 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 766 767 /* sanity checks */ 768 if (!data || !ifp) { 769 panic("invalid argument to in_lifaddr_ioctl"); 770 /*NOTRECHED*/ 771 } 772 773 switch (cmd) { 774 case SIOCGLIFADDR: 775 /* address must be specified on GET with IFLR_PREFIX */ 776 if ((iflr->flags & IFLR_PREFIX) == 0) 777 break; 778 /*FALLTHROUGH*/ 779 case SIOCALIFADDR: 780 case SIOCDLIFADDR: 781 /* address must be specified on ADD and DELETE */ 782 if (iflr->addr.ss_family != AF_INET) 783 return EINVAL; 784 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 785 return EINVAL; 786 /* XXX need improvement */ 787 if (iflr->dstaddr.ss_family 788 && iflr->dstaddr.ss_family != AF_INET) 789 return EINVAL; 790 if (iflr->dstaddr.ss_family 791 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 792 return EINVAL; 793 break; 794 default: /*shouldn't happen*/ 795 return EOPNOTSUPP; 796 } 797 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 798 return EINVAL; 799 800 switch (cmd) { 801 case SIOCALIFADDR: 802 { 803 struct in_aliasreq ifra; 804 805 if (iflr->flags & IFLR_PREFIX) 806 return EINVAL; 807 808 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 809 bzero(&ifra, sizeof ifra); 810 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name); 811 812 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 813 814 if (iflr->dstaddr.ss_family) { /*XXX*/ 815 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 816 iflr->dstaddr.ss_len); 817 } 818 819 ifra.ifra_mask.sin_family = AF_INET; 820 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 821 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 822 823 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 824 } 825 case SIOCGLIFADDR: 826 case SIOCDLIFADDR: 827 { 828 struct ifaddr_container *ifac; 829 struct in_ifaddr *ia; 830 struct in_addr mask, candidate, match; 831 struct sockaddr_in *sin; 832 int cmp; 833 834 bzero(&mask, sizeof mask); 835 if (iflr->flags & IFLR_PREFIX) { 836 /* lookup a prefix rather than address. */ 837 in_len2mask(&mask, iflr->prefixlen); 838 839 sin = (struct sockaddr_in *)&iflr->addr; 840 match.s_addr = sin->sin_addr.s_addr; 841 match.s_addr &= mask.s_addr; 842 843 /* if you set extra bits, that's wrong */ 844 if (match.s_addr != sin->sin_addr.s_addr) 845 return EINVAL; 846 847 cmp = 1; 848 } else { 849 if (cmd == SIOCGLIFADDR) { 850 /* on getting an address, take the 1st match */ 851 match.s_addr = 0; /* gcc4 warning */ 852 cmp = 0; /*XXX*/ 853 } else { 854 /* on deleting an address, do exact match */ 855 in_len2mask(&mask, 32); 856 sin = (struct sockaddr_in *)&iflr->addr; 857 match.s_addr = sin->sin_addr.s_addr; 858 859 cmp = 1; 860 } 861 } 862 863 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 864 struct ifaddr *ifa = ifac->ifa; 865 866 if (ifa->ifa_addr->sa_family != AF_INET6) 867 continue; 868 if (!cmp) 869 break; 870 candidate.s_addr = 871 ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 872 candidate.s_addr &= mask.s_addr; 873 if (candidate.s_addr == match.s_addr) 874 break; 875 } 876 if (ifac == NULL) 877 return EADDRNOTAVAIL; 878 ia = (struct in_ifaddr *)(ifac->ifa); 879 880 if (cmd == SIOCGLIFADDR) { 881 /* fill in the if_laddrreq structure */ 882 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 883 884 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 885 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 886 ia->ia_dstaddr.sin_len); 887 } else 888 bzero(&iflr->dstaddr, sizeof iflr->dstaddr); 889 890 iflr->prefixlen = 891 in_mask2len(&ia->ia_sockmask.sin_addr); 892 893 iflr->flags = 0; /*XXX*/ 894 895 return 0; 896 } else { 897 struct in_aliasreq ifra; 898 899 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 900 bzero(&ifra, sizeof ifra); 901 bcopy(iflr->iflr_name, ifra.ifra_name, 902 sizeof ifra.ifra_name); 903 904 bcopy(&ia->ia_addr, &ifra.ifra_addr, 905 ia->ia_addr.sin_len); 906 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 907 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 908 ia->ia_dstaddr.sin_len); 909 } 910 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 911 ia->ia_sockmask.sin_len); 912 913 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 914 ifp, td); 915 } 916 } 917 } 918 919 return EOPNOTSUPP; /*just for safety*/ 920 } 921 922 /* 923 * Delete any existing route for an interface. 924 */ 925 void 926 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia) 927 { 928 929 if ((ia->ia_flags & IFA_ROUTE) == 0) 930 return; 931 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) 932 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 933 else 934 rtinit(&ia->ia_ifa, RTM_DELETE, 0); 935 ia->ia_flags &= ~IFA_ROUTE; 936 } 937 938 /* 939 * Initialize an interface's internet address 940 * and routing table entry. 941 */ 942 static int 943 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, 944 const struct sockaddr_in *sin, int scrub) 945 { 946 u_long i = ntohl(sin->sin_addr.s_addr); 947 struct sockaddr_in oldaddr; 948 struct ifaddr_container *ifac; 949 int flags = RTF_UP, error = 0; 950 int was_hash = 0; 951 952 ifac = &ia->ia_ifa.ifa_containers[mycpuid]; 953 oldaddr = ia->ia_addr; 954 955 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) { 956 was_hash = 1; 957 in_iahash_remove(ia); 958 } 959 960 ia->ia_addr = *sin; 961 if (ia->ia_addr.sin_family == AF_INET) 962 in_iahash_insert(ia); 963 964 /* 965 * Give the interface a chance to initialize 966 * if this is its first address, 967 * and to validate the address if necessary. 968 */ 969 if (ifp->if_ioctl != NULL) { 970 lwkt_serialize_enter(ifp->if_serializer); 971 error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL); 972 lwkt_serialize_exit(ifp->if_serializer); 973 if (error) 974 goto fail; 975 } 976 977 /* 978 * Delete old route, if requested. 979 */ 980 if (scrub) { 981 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 982 in_ifscrub(ifp, ia); 983 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 984 } 985 986 /* 987 * Calculate netmask/subnetmask. 988 */ 989 if (IN_CLASSA(i)) 990 ia->ia_netmask = IN_CLASSA_NET; 991 else if (IN_CLASSB(i)) 992 ia->ia_netmask = IN_CLASSB_NET; 993 else 994 ia->ia_netmask = IN_CLASSC_NET; 995 /* 996 * The subnet mask usually includes at least the standard network part, 997 * but may may be smaller in the case of supernetting. 998 * If it is set, we believe it. 999 */ 1000 if (ia->ia_subnetmask == 0) { 1001 ia->ia_subnetmask = ia->ia_netmask; 1002 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 1003 } else { 1004 ia->ia_netmask &= ia->ia_subnetmask; 1005 } 1006 ia->ia_net = i & ia->ia_netmask; 1007 ia->ia_subnet = i & ia->ia_subnetmask; 1008 in_socktrim(&ia->ia_sockmask); 1009 1010 /* 1011 * Add route for the network. 1012 */ 1013 ia->ia_ifa.ifa_metric = ifp->if_metric; 1014 if (ifp->if_flags & IFF_BROADCAST) { 1015 ia->ia_broadaddr.sin_addr.s_addr = 1016 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 1017 ia->ia_netbroadcast.s_addr = 1018 htonl(ia->ia_net | ~ ia->ia_netmask); 1019 } else if (ifp->if_flags & IFF_LOOPBACK) { 1020 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr; 1021 flags |= RTF_HOST; 1022 } else if (ifp->if_flags & IFF_POINTOPOINT) { 1023 if (ia->ia_dstaddr.sin_family != AF_INET) 1024 return (0); 1025 flags |= RTF_HOST; 1026 } 1027 1028 /*- 1029 * Don't add host routes for interface addresses of 1030 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it 1031 * possible to assign several such address pairs with consistent 1032 * results (no host route) and is required by BOOTP. 1033 * 1034 * XXX: This is ugly ! There should be a way for the caller to 1035 * say that they don't want a host route. 1036 */ 1037 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY || 1038 ia->ia_netmask != IN_CLASSA_NET || 1039 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) { 1040 if ((error = rtinit(&ia->ia_ifa, RTM_ADD, flags)) != 0) 1041 goto fail; 1042 ia->ia_flags |= IFA_ROUTE; 1043 } 1044 1045 /* 1046 * If the interface supports multicast, join the "all hosts" 1047 * multicast group on that interface. 1048 */ 1049 if (ifp->if_flags & IFF_MULTICAST) { 1050 struct in_addr addr; 1051 1052 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 1053 in_addmulti(&addr, ifp); 1054 } 1055 return (0); 1056 fail: 1057 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) 1058 in_iahash_remove(ia); 1059 1060 ia->ia_addr = oldaddr; 1061 if (was_hash) 1062 in_iahash_insert(ia); 1063 return (error); 1064 } 1065 1066 1067 /* 1068 * Return 1 if the address might be a local broadcast address. 1069 */ 1070 int 1071 in_broadcast(struct in_addr in, struct ifnet *ifp) 1072 { 1073 struct ifaddr_container *ifac; 1074 u_long t; 1075 1076 if (in.s_addr == INADDR_BROADCAST || 1077 in.s_addr == INADDR_ANY) 1078 return 1; 1079 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1080 return 0; 1081 t = ntohl(in.s_addr); 1082 /* 1083 * Look through the list of addresses for a match 1084 * with a broadcast address. 1085 */ 1086 #define ia ((struct in_ifaddr *)ifa) 1087 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1088 struct ifaddr *ifa = ifac->ifa; 1089 1090 if (ifa->ifa_addr->sa_family == AF_INET && 1091 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1092 in.s_addr == ia->ia_netbroadcast.s_addr || 1093 /* 1094 * Check for old-style (host 0) broadcast. 1095 */ 1096 t == ia->ia_subnet || t == ia->ia_net) && 1097 /* 1098 * Check for an all one subnetmask. These 1099 * only exist when an interface gets a secondary 1100 * address. 1101 */ 1102 ia->ia_subnetmask != (u_long)0xffffffff) 1103 return 1; 1104 } 1105 return (0); 1106 #undef ia 1107 } 1108 /* 1109 * Add an address to the list of IP multicast addresses for a given interface. 1110 */ 1111 struct in_multi * 1112 in_addmulti(struct in_addr *ap, struct ifnet *ifp) 1113 { 1114 struct in_multi *inm; 1115 int error; 1116 struct sockaddr_in sin; 1117 struct ifmultiaddr *ifma; 1118 1119 /* 1120 * Call generic routine to add membership or increment 1121 * refcount. It wants addresses in the form of a sockaddr, 1122 * so we build one here (being careful to zero the unused bytes). 1123 */ 1124 bzero(&sin, sizeof sin); 1125 sin.sin_family = AF_INET; 1126 sin.sin_len = sizeof sin; 1127 sin.sin_addr = *ap; 1128 crit_enter(); 1129 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 1130 if (error) { 1131 crit_exit(); 1132 return 0; 1133 } 1134 1135 /* 1136 * If ifma->ifma_protospec is null, then if_addmulti() created 1137 * a new record. Otherwise, we are done. 1138 */ 1139 if (ifma->ifma_protospec != 0) { 1140 crit_exit(); 1141 return ifma->ifma_protospec; 1142 } 1143 1144 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 1145 at interrupt time? If so, need to fix if_addmulti. XXX */ 1146 inm = kmalloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO); 1147 inm->inm_addr = *ap; 1148 inm->inm_ifp = ifp; 1149 inm->inm_ifma = ifma; 1150 ifma->ifma_protospec = inm; 1151 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 1152 1153 /* 1154 * Let IGMP know that we have joined a new IP multicast group. 1155 */ 1156 igmp_joingroup(inm); 1157 crit_exit(); 1158 return (inm); 1159 } 1160 1161 /* 1162 * Delete a multicast address record. 1163 */ 1164 void 1165 in_delmulti(struct in_multi *inm) 1166 { 1167 struct ifmultiaddr *ifma; 1168 struct in_multi my_inm; 1169 1170 crit_enter(); 1171 ifma = inm->inm_ifma; 1172 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 1173 if (ifma->ifma_refcount == 1) { 1174 /* 1175 * No remaining claims to this record; let IGMP know that 1176 * we are leaving the multicast group. 1177 * But do it after the if_delmulti() which might reset 1178 * the interface and nuke the packet. 1179 */ 1180 my_inm = *inm ; 1181 ifma->ifma_protospec = 0; 1182 LIST_REMOVE(inm, inm_link); 1183 kfree(inm, M_IPMADDR); 1184 } 1185 /* XXX - should be separate API for when we have an ifma? */ 1186 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1187 if (my_inm.inm_ifp != NULL) 1188 igmp_leavegroup(&my_inm); 1189 crit_exit(); 1190 } 1191 1192 void 1193 in_ifdetach(struct ifnet *ifp) 1194 { 1195 in_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp); 1196 in_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp); 1197 } 1198