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 1.17 2005/11/28 17:13:46 dillon Exp $ 36 */ 37 38 #include "opt_bootp.h" 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/sockio.h> 42 #include <sys/malloc.h> 43 #include <sys/proc.h> 44 #include <sys/socket.h> 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 53 #include <netinet/in.h> 54 #include <netinet/in_var.h> 55 #include <netinet/in_pcb.h> 56 57 #include <netinet/igmp_var.h> 58 59 static MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address"); 60 61 static int in_mask2len (struct in_addr *); 62 static void in_len2mask (struct in_addr *, int); 63 static int in_lifaddr_ioctl (struct socket *, u_long, caddr_t, 64 struct ifnet *, struct thread *); 65 66 static void in_socktrim (struct sockaddr_in *); 67 static int in_ifinit (struct ifnet *, 68 struct in_ifaddr *, struct sockaddr_in *, int); 69 70 static int subnetsarelocal = 0; 71 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 72 &subnetsarelocal, 0, ""); 73 74 struct in_multihead in_multihead; /* XXX BSS initialization */ 75 76 extern struct inpcbinfo ripcbinfo; 77 extern struct inpcbinfo udbinfo; 78 79 /* 80 * Return 1 if an internet address is for a ``local'' host 81 * (one to which we have a connection). If subnetsarelocal 82 * is true, this includes other subnets of the local net. 83 * Otherwise, it includes only the directly-connected (sub)nets. 84 */ 85 int 86 in_localaddr(in) 87 struct in_addr in; 88 { 89 u_long i = ntohl(in.s_addr); 90 struct in_ifaddr *ia; 91 92 if (subnetsarelocal) { 93 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 94 if ((i & ia->ia_netmask) == ia->ia_net) 95 return (1); 96 } else { 97 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 98 if ((i & ia->ia_subnetmask) == ia->ia_subnet) 99 return (1); 100 } 101 return (0); 102 } 103 104 /* 105 * Determine whether an IP address is in a reserved set of addresses 106 * that may not be forwarded, or whether datagrams to that destination 107 * may be forwarded. 108 */ 109 int 110 in_canforward(in) 111 struct in_addr in; 112 { 113 u_long i = ntohl(in.s_addr); 114 u_long net; 115 116 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) 117 return (0); 118 if (IN_CLASSA(i)) { 119 net = i & IN_CLASSA_NET; 120 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 121 return (0); 122 } 123 return (1); 124 } 125 126 /* 127 * Trim a mask in a sockaddr 128 */ 129 static void 130 in_socktrim(ap) 131 struct sockaddr_in *ap; 132 { 133 char *cplim = (char *) &ap->sin_addr; 134 char *cp = (char *) (&ap->sin_addr + 1); 135 136 ap->sin_len = 0; 137 while (--cp >= cplim) 138 if (*cp) { 139 (ap)->sin_len = cp - (char *) (ap) + 1; 140 break; 141 } 142 } 143 144 static int 145 in_mask2len(mask) 146 struct in_addr *mask; 147 { 148 int x, y; 149 u_char *p; 150 151 p = (u_char *)mask; 152 for (x = 0; x < sizeof *mask; x++) { 153 if (p[x] != 0xff) 154 break; 155 } 156 y = 0; 157 if (x < sizeof *mask) { 158 for (y = 0; y < 8; y++) { 159 if ((p[x] & (0x80 >> y)) == 0) 160 break; 161 } 162 } 163 return x * 8 + y; 164 } 165 166 static void 167 in_len2mask(mask, len) 168 struct in_addr *mask; 169 int len; 170 { 171 int i; 172 u_char *p; 173 174 p = (u_char *)mask; 175 bzero(mask, sizeof *mask); 176 for (i = 0; i < len / 8; i++) 177 p[i] = 0xff; 178 if (len % 8) 179 p[i] = (0xff00 >> (len % 8)) & 0xff; 180 } 181 182 static int in_interfaces; /* number of external internet interfaces */ 183 184 /* 185 * Generic internet control operations (ioctl's). 186 * Ifp is 0 if not an interface-specific ioctl. 187 * 188 * NOTE! td might be NULL. 189 */ 190 /* ARGSUSED */ 191 int 192 in_control(so, cmd, data, ifp, td) 193 struct socket *so; 194 u_long cmd; 195 caddr_t data; 196 struct ifnet *ifp; 197 struct thread *td; 198 { 199 struct ifreq *ifr = (struct ifreq *)data; 200 struct in_ifaddr *ia = 0, *iap; 201 struct ifaddr *ifa; 202 struct in_addr dst; 203 struct in_ifaddr *oia; 204 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 205 struct sockaddr_in oldaddr; 206 int hostIsNew, iaIsNew, maskIsNew; 207 int error = 0; 208 209 iaIsNew = 0; 210 211 switch (cmd) { 212 case SIOCALIFADDR: 213 case SIOCDLIFADDR: 214 if (td && (error = suser(td)) != 0) 215 return error; 216 /*fall through*/ 217 case SIOCGLIFADDR: 218 if (!ifp) 219 return EINVAL; 220 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 221 } 222 223 /* 224 * Find address for this interface, if it exists. 225 * 226 * If an alias address was specified, find that one instead of 227 * the first one on the interface, if possible 228 */ 229 if (ifp) { 230 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 231 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) 232 if (iap->ia_ifp == ifp && 233 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 234 ia = iap; 235 break; 236 } 237 if (ia == NULL) 238 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 239 iap = ifatoia(ifa); 240 if (iap->ia_addr.sin_family == AF_INET) { 241 ia = iap; 242 break; 243 } 244 } 245 } 246 247 switch (cmd) { 248 249 case SIOCAIFADDR: 250 case SIOCDIFADDR: 251 if (ifp == 0) 252 return (EADDRNOTAVAIL); 253 if (ifra->ifra_addr.sin_family == AF_INET) { 254 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 255 if (ia->ia_ifp == ifp && 256 ia->ia_addr.sin_addr.s_addr == 257 ifra->ifra_addr.sin_addr.s_addr) 258 break; 259 } 260 if ((ifp->if_flags & IFF_POINTOPOINT) 261 && (cmd == SIOCAIFADDR) 262 && (ifra->ifra_dstaddr.sin_addr.s_addr 263 == INADDR_ANY)) { 264 return EDESTADDRREQ; 265 } 266 } 267 if (cmd == SIOCDIFADDR && ia == 0) 268 return (EADDRNOTAVAIL); 269 /* FALLTHROUGH */ 270 case SIOCSIFADDR: 271 case SIOCSIFNETMASK: 272 case SIOCSIFDSTADDR: 273 if (td && (error = suser(td)) != 0) 274 return error; 275 276 if (ifp == 0) 277 return (EADDRNOTAVAIL); 278 if (ia == (struct in_ifaddr *)0) { 279 ia = (struct in_ifaddr *) 280 malloc(sizeof *ia, M_IFADDR, M_WAITOK); 281 if (ia == (struct in_ifaddr *)NULL) 282 return (ENOBUFS); 283 bzero(ia, sizeof *ia); 284 /* 285 * Protect from ipintr() traversing address list 286 * while we're modifying it. 287 */ 288 crit_enter(); 289 290 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link); 291 ifa = &ia->ia_ifa; 292 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 293 294 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 295 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 296 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 297 ia->ia_sockmask.sin_len = 8; 298 ia->ia_sockmask.sin_family = AF_INET; 299 if (ifp->if_flags & IFF_BROADCAST) { 300 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr; 301 ia->ia_broadaddr.sin_family = AF_INET; 302 } 303 ia->ia_ifp = ifp; 304 if (!(ifp->if_flags & IFF_LOOPBACK)) 305 in_interfaces++; 306 iaIsNew = 1; 307 crit_exit(); 308 } 309 break; 310 311 case SIOCSIFBRDADDR: 312 if (td && (error = suser(td)) != 0) 313 return error; 314 /* FALLTHROUGH */ 315 316 case SIOCGIFADDR: 317 case SIOCGIFNETMASK: 318 case SIOCGIFDSTADDR: 319 case SIOCGIFBRDADDR: 320 if (ia == (struct in_ifaddr *)0) 321 return (EADDRNOTAVAIL); 322 break; 323 } 324 switch (cmd) { 325 326 case SIOCGIFADDR: 327 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 328 return (0); 329 330 case SIOCGIFBRDADDR: 331 if ((ifp->if_flags & IFF_BROADCAST) == 0) 332 return (EINVAL); 333 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 334 return (0); 335 336 case SIOCGIFDSTADDR: 337 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 338 return (EINVAL); 339 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 340 return (0); 341 342 case SIOCGIFNETMASK: 343 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 344 return (0); 345 346 case SIOCSIFDSTADDR: 347 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 348 return (EINVAL); 349 oldaddr = ia->ia_dstaddr; 350 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 351 lwkt_serialize_enter(ifp->if_serializer); 352 if (ifp->if_ioctl && 353 (error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia, 354 td->td_proc->p_ucred))) { 355 ia->ia_dstaddr = oldaddr; 356 lwkt_serialize_exit(ifp->if_serializer); 357 return (error); 358 } 359 if (ia->ia_flags & IFA_ROUTE) { 360 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 361 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 362 ia->ia_ifa.ifa_dstaddr = 363 (struct sockaddr *)&ia->ia_dstaddr; 364 rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP); 365 } 366 lwkt_serialize_exit(ifp->if_serializer); 367 return (0); 368 369 case SIOCSIFBRDADDR: 370 if ((ifp->if_flags & IFF_BROADCAST) == 0) 371 return (EINVAL); 372 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 373 return (0); 374 375 case SIOCSIFADDR: 376 error = in_ifinit(ifp, ia, 377 (struct sockaddr_in *) &ifr->ifr_addr, 1); 378 if (error != 0 && iaIsNew) 379 break; 380 if (error == 0) 381 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 382 return (0); 383 384 case SIOCSIFNETMASK: 385 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 386 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 387 return (0); 388 389 case SIOCAIFADDR: 390 maskIsNew = 0; 391 hostIsNew = 1; 392 error = 0; 393 if (ia->ia_addr.sin_family == AF_INET) { 394 if (ifra->ifra_addr.sin_len == 0) { 395 ifra->ifra_addr = ia->ia_addr; 396 hostIsNew = 0; 397 } else if (ifra->ifra_addr.sin_addr.s_addr == 398 ia->ia_addr.sin_addr.s_addr) 399 hostIsNew = 0; 400 } 401 if (ifra->ifra_mask.sin_len) { 402 in_ifscrub(ifp, ia); 403 ia->ia_sockmask = ifra->ifra_mask; 404 ia->ia_sockmask.sin_family = AF_INET; 405 ia->ia_subnetmask = 406 ntohl(ia->ia_sockmask.sin_addr.s_addr); 407 maskIsNew = 1; 408 } 409 if ((ifp->if_flags & IFF_POINTOPOINT) && 410 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 411 in_ifscrub(ifp, ia); 412 ia->ia_dstaddr = ifra->ifra_dstaddr; 413 maskIsNew = 1; /* We lie; but the effect's the same */ 414 } 415 if (ifra->ifra_addr.sin_family == AF_INET && 416 (hostIsNew || maskIsNew)) 417 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 418 419 if (error != 0 && iaIsNew) 420 break; 421 422 if ((ifp->if_flags & IFF_BROADCAST) && 423 (ifra->ifra_broadaddr.sin_family == AF_INET)) 424 ia->ia_broadaddr = ifra->ifra_broadaddr; 425 if (error == 0) 426 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 427 return (error); 428 429 case SIOCDIFADDR: 430 /* 431 * in_ifscrub kills the interface route. 432 */ 433 in_ifscrub(ifp, ia); 434 /* 435 * in_ifadown gets rid of all the rest of 436 * the routes. This is not quite the right 437 * thing to do, but at least if we are running 438 * a routing process they will come back. 439 */ 440 in_ifadown(&ia->ia_ifa, 1); 441 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 442 error = 0; 443 break; 444 445 default: 446 if (ifp == NULL || ifp->if_ioctl == NULL) 447 return (EOPNOTSUPP); 448 lwkt_serialize_enter(ifp->if_serializer); 449 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred); 450 lwkt_serialize_exit(ifp->if_serializer); 451 return (error); 452 } 453 454 /* 455 * Protect from ipintr() traversing address list while we're modifying 456 * it. 457 */ 458 lwkt_serialize_enter(ifp->if_serializer); 459 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 460 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link); 461 LIST_REMOVE(ia, ia_hash); 462 IFAFREE(&ia->ia_ifa); 463 lwkt_serialize_exit(ifp->if_serializer); 464 465 return (error); 466 } 467 468 /* 469 * SIOC[GAD]LIFADDR. 470 * SIOCGLIFADDR: get first address. (?!?) 471 * SIOCGLIFADDR with IFLR_PREFIX: 472 * get first address that matches the specified prefix. 473 * SIOCALIFADDR: add the specified address. 474 * SIOCALIFADDR with IFLR_PREFIX: 475 * EINVAL since we can't deduce hostid part of the address. 476 * SIOCDLIFADDR: delete the specified address. 477 * SIOCDLIFADDR with IFLR_PREFIX: 478 * delete the first address that matches the specified prefix. 479 * return values: 480 * EINVAL on invalid parameters 481 * EADDRNOTAVAIL on prefix match failed/specified address not found 482 * other values may be returned from in_ioctl() 483 * 484 * NOTE! td might be NULL. 485 */ 486 static int 487 in_lifaddr_ioctl(so, cmd, data, ifp, td) 488 struct socket *so; 489 u_long cmd; 490 caddr_t data; 491 struct ifnet *ifp; 492 struct thread *td; 493 { 494 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 495 struct ifaddr *ifa; 496 497 /* sanity checks */ 498 if (!data || !ifp) { 499 panic("invalid argument to in_lifaddr_ioctl"); 500 /*NOTRECHED*/ 501 } 502 503 switch (cmd) { 504 case SIOCGLIFADDR: 505 /* address must be specified on GET with IFLR_PREFIX */ 506 if ((iflr->flags & IFLR_PREFIX) == 0) 507 break; 508 /*FALLTHROUGH*/ 509 case SIOCALIFADDR: 510 case SIOCDLIFADDR: 511 /* address must be specified on ADD and DELETE */ 512 if (iflr->addr.ss_family != AF_INET) 513 return EINVAL; 514 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 515 return EINVAL; 516 /* XXX need improvement */ 517 if (iflr->dstaddr.ss_family 518 && iflr->dstaddr.ss_family != AF_INET) 519 return EINVAL; 520 if (iflr->dstaddr.ss_family 521 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 522 return EINVAL; 523 break; 524 default: /*shouldn't happen*/ 525 return EOPNOTSUPP; 526 } 527 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 528 return EINVAL; 529 530 switch (cmd) { 531 case SIOCALIFADDR: 532 { 533 struct in_aliasreq ifra; 534 535 if (iflr->flags & IFLR_PREFIX) 536 return EINVAL; 537 538 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 539 bzero(&ifra, sizeof ifra); 540 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name); 541 542 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 543 544 if (iflr->dstaddr.ss_family) { /*XXX*/ 545 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 546 iflr->dstaddr.ss_len); 547 } 548 549 ifra.ifra_mask.sin_family = AF_INET; 550 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 551 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 552 553 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 554 } 555 case SIOCGLIFADDR: 556 case SIOCDLIFADDR: 557 { 558 struct in_ifaddr *ia; 559 struct in_addr mask, candidate, match; 560 struct sockaddr_in *sin; 561 int cmp; 562 563 bzero(&mask, sizeof mask); 564 if (iflr->flags & IFLR_PREFIX) { 565 /* lookup a prefix rather than address. */ 566 in_len2mask(&mask, iflr->prefixlen); 567 568 sin = (struct sockaddr_in *)&iflr->addr; 569 match.s_addr = sin->sin_addr.s_addr; 570 match.s_addr &= mask.s_addr; 571 572 /* if you set extra bits, that's wrong */ 573 if (match.s_addr != sin->sin_addr.s_addr) 574 return EINVAL; 575 576 cmp = 1; 577 } else { 578 if (cmd == SIOCGLIFADDR) { 579 /* on getting an address, take the 1st match */ 580 cmp = 0; /*XXX*/ 581 } else { 582 /* on deleting an address, do exact match */ 583 in_len2mask(&mask, 32); 584 sin = (struct sockaddr_in *)&iflr->addr; 585 match.s_addr = sin->sin_addr.s_addr; 586 587 cmp = 1; 588 } 589 } 590 591 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 592 if (ifa->ifa_addr->sa_family != AF_INET6) 593 continue; 594 if (!cmp) 595 break; 596 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 597 candidate.s_addr &= mask.s_addr; 598 if (candidate.s_addr == match.s_addr) 599 break; 600 } 601 if (!ifa) 602 return EADDRNOTAVAIL; 603 ia = (struct in_ifaddr *)ifa; 604 605 if (cmd == SIOCGLIFADDR) { 606 /* fill in the if_laddrreq structure */ 607 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 608 609 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 610 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 611 ia->ia_dstaddr.sin_len); 612 } else 613 bzero(&iflr->dstaddr, sizeof iflr->dstaddr); 614 615 iflr->prefixlen = 616 in_mask2len(&ia->ia_sockmask.sin_addr); 617 618 iflr->flags = 0; /*XXX*/ 619 620 return 0; 621 } else { 622 struct in_aliasreq ifra; 623 624 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 625 bzero(&ifra, sizeof ifra); 626 bcopy(iflr->iflr_name, ifra.ifra_name, 627 sizeof ifra.ifra_name); 628 629 bcopy(&ia->ia_addr, &ifra.ifra_addr, 630 ia->ia_addr.sin_len); 631 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 632 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 633 ia->ia_dstaddr.sin_len); 634 } 635 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 636 ia->ia_sockmask.sin_len); 637 638 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 639 ifp, td); 640 } 641 } 642 } 643 644 return EOPNOTSUPP; /*just for safety*/ 645 } 646 647 /* 648 * Delete any existing route for an interface. 649 */ 650 void 651 in_ifscrub(ifp, ia) 652 struct ifnet *ifp; 653 struct in_ifaddr *ia; 654 { 655 656 if ((ia->ia_flags & IFA_ROUTE) == 0) 657 return; 658 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) 659 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 660 else 661 rtinit(&ia->ia_ifa, RTM_DELETE, 0); 662 ia->ia_flags &= ~IFA_ROUTE; 663 } 664 665 /* 666 * Initialize an interface's internet address 667 * and routing table entry. 668 */ 669 static int 670 in_ifinit(ifp, ia, sin, scrub) 671 struct ifnet *ifp; 672 struct in_ifaddr *ia; 673 struct sockaddr_in *sin; 674 int scrub; 675 { 676 u_long i = ntohl(sin->sin_addr.s_addr); 677 struct sockaddr_in oldaddr; 678 int flags = RTF_UP, error = 0; 679 680 lwkt_serialize_enter(ifp->if_serializer); 681 682 oldaddr = ia->ia_addr; 683 if (oldaddr.sin_family == AF_INET) 684 LIST_REMOVE(ia, ia_hash); 685 ia->ia_addr = *sin; 686 if (ia->ia_addr.sin_family == AF_INET) 687 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 688 ia, ia_hash); 689 /* 690 * Give the interface a chance to initialize 691 * if this is its first address, 692 * and to validate the address if necessary. 693 */ 694 if (ifp->if_ioctl && 695 (error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL))) { 696 lwkt_serialize_exit(ifp->if_serializer); 697 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 698 ia->ia_addr = oldaddr; 699 if (ia->ia_addr.sin_family == AF_INET) 700 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 701 ia, ia_hash); 702 return (error); 703 } 704 lwkt_serialize_exit(ifp->if_serializer); 705 if (scrub) { 706 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 707 in_ifscrub(ifp, ia); 708 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 709 } 710 if (IN_CLASSA(i)) 711 ia->ia_netmask = IN_CLASSA_NET; 712 else if (IN_CLASSB(i)) 713 ia->ia_netmask = IN_CLASSB_NET; 714 else 715 ia->ia_netmask = IN_CLASSC_NET; 716 /* 717 * The subnet mask usually includes at least the standard network part, 718 * but may may be smaller in the case of supernetting. 719 * If it is set, we believe it. 720 */ 721 if (ia->ia_subnetmask == 0) { 722 ia->ia_subnetmask = ia->ia_netmask; 723 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 724 } else 725 ia->ia_netmask &= ia->ia_subnetmask; 726 ia->ia_net = i & ia->ia_netmask; 727 ia->ia_subnet = i & ia->ia_subnetmask; 728 in_socktrim(&ia->ia_sockmask); 729 /* 730 * Add route for the network. 731 */ 732 ia->ia_ifa.ifa_metric = ifp->if_metric; 733 if (ifp->if_flags & IFF_BROADCAST) { 734 ia->ia_broadaddr.sin_addr.s_addr = 735 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 736 ia->ia_netbroadcast.s_addr = 737 htonl(ia->ia_net | ~ ia->ia_netmask); 738 } else if (ifp->if_flags & IFF_LOOPBACK) { 739 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr; 740 flags |= RTF_HOST; 741 } else if (ifp->if_flags & IFF_POINTOPOINT) { 742 if (ia->ia_dstaddr.sin_family != AF_INET) 743 return (0); 744 flags |= RTF_HOST; 745 } 746 747 /*- 748 * Don't add host routes for interface addresses of 749 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it 750 * possible to assign several such address pairs with consistent 751 * results (no host route) and is required by BOOTP. 752 * 753 * XXX: This is ugly ! There should be a way for the caller to 754 * say that they don't want a host route. 755 */ 756 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY || 757 ia->ia_netmask != IN_CLASSA_NET || 758 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) { 759 if ((error = rtinit(&ia->ia_ifa, (int)RTM_ADD, flags)) != 0) { 760 ia->ia_addr = oldaddr; 761 return (error); 762 } 763 ia->ia_flags |= IFA_ROUTE; 764 } 765 766 /* 767 * If the interface supports multicast, join the "all hosts" 768 * multicast group on that interface. 769 */ 770 if (ifp->if_flags & IFF_MULTICAST) { 771 struct in_addr addr; 772 773 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 774 in_addmulti(&addr, ifp); 775 } 776 return (error); 777 } 778 779 780 /* 781 * Return 1 if the address might be a local broadcast address. 782 */ 783 int 784 in_broadcast(struct in_addr in, struct ifnet *ifp) 785 { 786 struct ifaddr *ifa; 787 u_long t; 788 789 if (in.s_addr == INADDR_BROADCAST || 790 in.s_addr == INADDR_ANY) 791 return 1; 792 if ((ifp->if_flags & IFF_BROADCAST) == 0) 793 return 0; 794 t = ntohl(in.s_addr); 795 /* 796 * Look through the list of addresses for a match 797 * with a broadcast address. 798 */ 799 #define ia ((struct in_ifaddr *)ifa) 800 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 801 if (ifa->ifa_addr->sa_family == AF_INET && 802 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 803 in.s_addr == ia->ia_netbroadcast.s_addr || 804 /* 805 * Check for old-style (host 0) broadcast. 806 */ 807 t == ia->ia_subnet || t == ia->ia_net) && 808 /* 809 * Check for an all one subnetmask. These 810 * only exist when an interface gets a secondary 811 * address. 812 */ 813 ia->ia_subnetmask != (u_long)0xffffffff) 814 return 1; 815 return (0); 816 #undef ia 817 } 818 /* 819 * Add an address to the list of IP multicast addresses for a given interface. 820 */ 821 struct in_multi * 822 in_addmulti(ap, ifp) 823 struct in_addr *ap; 824 struct ifnet *ifp; 825 { 826 struct in_multi *inm; 827 int error; 828 struct sockaddr_in sin; 829 struct ifmultiaddr *ifma; 830 831 /* 832 * Call generic routine to add membership or increment 833 * refcount. It wants addresses in the form of a sockaddr, 834 * so we build one here (being careful to zero the unused bytes). 835 */ 836 bzero(&sin, sizeof sin); 837 sin.sin_family = AF_INET; 838 sin.sin_len = sizeof sin; 839 sin.sin_addr = *ap; 840 crit_enter(); 841 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 842 if (error) { 843 crit_exit(); 844 return 0; 845 } 846 847 /* 848 * If ifma->ifma_protospec is null, then if_addmulti() created 849 * a new record. Otherwise, we are done. 850 */ 851 if (ifma->ifma_protospec != 0) { 852 crit_exit(); 853 return ifma->ifma_protospec; 854 } 855 856 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 857 at interrupt time? If so, need to fix if_addmulti. XXX */ 858 inm = malloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO); 859 inm->inm_addr = *ap; 860 inm->inm_ifp = ifp; 861 inm->inm_ifma = ifma; 862 ifma->ifma_protospec = inm; 863 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 864 865 /* 866 * Let IGMP know that we have joined a new IP multicast group. 867 */ 868 igmp_joingroup(inm); 869 crit_exit(); 870 return (inm); 871 } 872 873 /* 874 * Delete a multicast address record. 875 */ 876 void 877 in_delmulti(inm) 878 struct in_multi *inm; 879 { 880 struct ifmultiaddr *ifma; 881 struct in_multi my_inm; 882 883 crit_enter(); 884 ifma = inm->inm_ifma; 885 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 886 if (ifma->ifma_refcount == 1) { 887 /* 888 * No remaining claims to this record; let IGMP know that 889 * we are leaving the multicast group. 890 * But do it after the if_delmulti() which might reset 891 * the interface and nuke the packet. 892 */ 893 my_inm = *inm ; 894 ifma->ifma_protospec = 0; 895 LIST_REMOVE(inm, inm_link); 896 free(inm, M_IPMADDR); 897 } 898 /* XXX - should be separate API for when we have an ifma? */ 899 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 900 if (my_inm.inm_ifp != NULL) 901 igmp_leavegroup(&my_inm); 902 crit_exit(); 903 } 904 905 void 906 in_ifdetach(struct ifnet *ifp) 907 { 908 in_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp); 909 in_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp); 910 } 911