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 1.25 2008/01/03 11:41:05 sephe 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 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(struct in_addr in) 87 { 88 u_long i = ntohl(in.s_addr); 89 struct in_ifaddr *ia; 90 91 if (subnetsarelocal) { 92 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 93 if ((i & ia->ia_netmask) == ia->ia_net) 94 return (1); 95 } else { 96 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 97 if ((i & ia->ia_subnetmask) == ia->ia_subnet) 98 return (1); 99 } 100 return (0); 101 } 102 103 /* 104 * Determine whether an IP address is in a reserved set of addresses 105 * that may not be forwarded, or whether datagrams to that destination 106 * may be forwarded. 107 */ 108 int 109 in_canforward(struct in_addr in) 110 { 111 u_long i = ntohl(in.s_addr); 112 u_long net; 113 114 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) 115 return (0); 116 if (IN_CLASSA(i)) { 117 net = i & IN_CLASSA_NET; 118 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 119 return (0); 120 } 121 return (1); 122 } 123 124 /* 125 * Trim a mask in a sockaddr 126 */ 127 static void 128 in_socktrim(struct sockaddr_in *ap) 129 { 130 char *cplim = (char *) &ap->sin_addr; 131 char *cp = (char *) (&ap->sin_addr + 1); 132 133 ap->sin_len = 0; 134 while (--cp >= cplim) 135 if (*cp) { 136 (ap)->sin_len = cp - (char *) (ap) + 1; 137 break; 138 } 139 } 140 141 static int 142 in_mask2len(struct in_addr *mask) 143 { 144 int x, y; 145 u_char *p; 146 147 p = (u_char *)mask; 148 for (x = 0; x < sizeof *mask; x++) { 149 if (p[x] != 0xff) 150 break; 151 } 152 y = 0; 153 if (x < sizeof *mask) { 154 for (y = 0; y < 8; y++) { 155 if ((p[x] & (0x80 >> y)) == 0) 156 break; 157 } 158 } 159 return x * 8 + y; 160 } 161 162 static void 163 in_len2mask(struct in_addr *mask, int len) 164 { 165 int i; 166 u_char *p; 167 168 p = (u_char *)mask; 169 bzero(mask, sizeof *mask); 170 for (i = 0; i < len / 8; i++) 171 p[i] = 0xff; 172 if (len % 8) 173 p[i] = (0xff00 >> (len % 8)) & 0xff; 174 } 175 176 static int in_interfaces; /* number of external internet interfaces */ 177 178 /* 179 * Generic internet control operations (ioctl's). 180 * Ifp is 0 if not an interface-specific ioctl. 181 * 182 * NOTE! td might be NULL. 183 */ 184 /* ARGSUSED */ 185 int 186 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 187 struct thread *td) 188 { 189 struct ifreq *ifr = (struct ifreq *)data; 190 struct in_ifaddr *ia = 0, *iap; 191 struct ifaddr *ifa; 192 struct in_addr dst; 193 struct in_ifaddr *oia; 194 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 195 struct sockaddr_in oldaddr; 196 int hostIsNew, iaIsNew, maskIsNew; 197 int error = 0; 198 199 iaIsNew = 0; 200 201 switch (cmd) { 202 case SIOCALIFADDR: 203 case SIOCDLIFADDR: 204 if (td && (error = suser(td)) != 0) 205 return error; 206 /*fall through*/ 207 case SIOCGLIFADDR: 208 if (!ifp) 209 return EINVAL; 210 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 211 } 212 213 /* 214 * Find address for this interface, if it exists. 215 * 216 * If an alias address was specified, find that one instead of 217 * the first one on the interface, if possible 218 */ 219 if (ifp) { 220 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 221 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) 222 if (iap->ia_ifp == ifp && 223 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 224 ia = iap; 225 break; 226 } 227 if (ia == NULL) 228 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 229 iap = ifatoia(ifa); 230 if (iap->ia_addr.sin_family == AF_INET) { 231 ia = iap; 232 break; 233 } 234 } 235 } 236 237 switch (cmd) { 238 239 case SIOCAIFADDR: 240 case SIOCDIFADDR: 241 if (ifp == NULL) 242 return (EADDRNOTAVAIL); 243 if (ifra->ifra_addr.sin_family == AF_INET) { 244 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 245 if (ia->ia_ifp == ifp && 246 ia->ia_addr.sin_addr.s_addr == 247 ifra->ifra_addr.sin_addr.s_addr) 248 break; 249 } 250 if ((ifp->if_flags & IFF_POINTOPOINT) 251 && (cmd == SIOCAIFADDR) 252 && (ifra->ifra_dstaddr.sin_addr.s_addr 253 == INADDR_ANY)) { 254 return EDESTADDRREQ; 255 } 256 } 257 if (cmd == SIOCDIFADDR && ia == NULL) 258 return (EADDRNOTAVAIL); 259 /* FALLTHROUGH */ 260 case SIOCSIFADDR: 261 case SIOCSIFNETMASK: 262 case SIOCSIFDSTADDR: 263 if (td && (error = suser(td)) != 0) 264 return error; 265 266 if (ifp == NULL) 267 return (EADDRNOTAVAIL); 268 if (ia == NULL) { 269 ia = kmalloc(sizeof *ia, M_IFADDR, M_WAITOK | M_ZERO); 270 271 /* 272 * Protect from NETISR_IP traversing address list 273 * while we're modifying it. 274 */ 275 crit_enter(); 276 277 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link); 278 ifa = &ia->ia_ifa; 279 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 280 281 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 282 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 283 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 284 ia->ia_sockmask.sin_len = 8; 285 ia->ia_sockmask.sin_family = AF_INET; 286 if (ifp->if_flags & IFF_BROADCAST) { 287 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr; 288 ia->ia_broadaddr.sin_family = AF_INET; 289 } 290 ia->ia_ifp = ifp; 291 if (!(ifp->if_flags & IFF_LOOPBACK)) 292 in_interfaces++; 293 iaIsNew = 1; 294 crit_exit(); 295 } 296 break; 297 298 case SIOCSIFBRDADDR: 299 if (td && (error = suser(td)) != 0) 300 return error; 301 /* FALLTHROUGH */ 302 303 case SIOCGIFADDR: 304 case SIOCGIFNETMASK: 305 case SIOCGIFDSTADDR: 306 case SIOCGIFBRDADDR: 307 if (ia == NULL) 308 return (EADDRNOTAVAIL); 309 break; 310 } 311 switch (cmd) { 312 313 case SIOCGIFADDR: 314 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 315 return (0); 316 317 case SIOCGIFBRDADDR: 318 if ((ifp->if_flags & IFF_BROADCAST) == 0) 319 return (EINVAL); 320 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 321 return (0); 322 323 case SIOCGIFDSTADDR: 324 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 325 return (EINVAL); 326 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 327 return (0); 328 329 case SIOCGIFNETMASK: 330 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 331 return (0); 332 333 case SIOCSIFDSTADDR: 334 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 335 return (EINVAL); 336 oldaddr = ia->ia_dstaddr; 337 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 338 lwkt_serialize_enter(ifp->if_serializer); 339 if (ifp->if_ioctl && 340 (error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia, 341 td->td_proc->p_ucred))) { 342 ia->ia_dstaddr = oldaddr; 343 lwkt_serialize_exit(ifp->if_serializer); 344 return (error); 345 } 346 if (ia->ia_flags & IFA_ROUTE) { 347 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 348 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 349 ia->ia_ifa.ifa_dstaddr = 350 (struct sockaddr *)&ia->ia_dstaddr; 351 rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP); 352 } 353 lwkt_serialize_exit(ifp->if_serializer); 354 return (0); 355 356 case SIOCSIFBRDADDR: 357 if ((ifp->if_flags & IFF_BROADCAST) == 0) 358 return (EINVAL); 359 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 360 return (0); 361 362 case SIOCSIFADDR: 363 error = in_ifinit(ifp, ia, 364 (struct sockaddr_in *) &ifr->ifr_addr, 1); 365 if (error != 0 && iaIsNew) 366 break; 367 if (error == 0) 368 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 369 return (0); 370 371 case SIOCSIFNETMASK: 372 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 373 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 374 return (0); 375 376 case SIOCAIFADDR: 377 maskIsNew = 0; 378 hostIsNew = 1; 379 error = 0; 380 if (ia->ia_addr.sin_family == AF_INET) { 381 if (ifra->ifra_addr.sin_len == 0) { 382 ifra->ifra_addr = ia->ia_addr; 383 hostIsNew = 0; 384 } else if (ifra->ifra_addr.sin_addr.s_addr == 385 ia->ia_addr.sin_addr.s_addr) 386 hostIsNew = 0; 387 } 388 if (ifra->ifra_mask.sin_len) { 389 in_ifscrub(ifp, ia); 390 ia->ia_sockmask = ifra->ifra_mask; 391 ia->ia_sockmask.sin_family = AF_INET; 392 ia->ia_subnetmask = 393 ntohl(ia->ia_sockmask.sin_addr.s_addr); 394 maskIsNew = 1; 395 } 396 if ((ifp->if_flags & IFF_POINTOPOINT) && 397 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 398 in_ifscrub(ifp, ia); 399 ia->ia_dstaddr = ifra->ifra_dstaddr; 400 maskIsNew = 1; /* We lie; but the effect's the same */ 401 } 402 if (ifra->ifra_addr.sin_family == AF_INET && 403 (hostIsNew || maskIsNew)) 404 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 405 406 if (error != 0 && iaIsNew) 407 break; 408 409 if ((ifp->if_flags & IFF_BROADCAST) && 410 (ifra->ifra_broadaddr.sin_family == AF_INET)) 411 ia->ia_broadaddr = ifra->ifra_broadaddr; 412 if (error == 0) 413 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 414 return (error); 415 416 case SIOCDIFADDR: 417 /* 418 * in_ifscrub kills the interface route. 419 */ 420 in_ifscrub(ifp, ia); 421 /* 422 * in_ifadown gets rid of all the rest of 423 * the routes. This is not quite the right 424 * thing to do, but at least if we are running 425 * a routing process they will come back. 426 */ 427 in_ifadown(&ia->ia_ifa, 1); 428 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 429 error = 0; 430 break; 431 432 default: 433 if (ifp == NULL || ifp->if_ioctl == NULL) 434 return (EOPNOTSUPP); 435 lwkt_serialize_enter(ifp->if_serializer); 436 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred); 437 lwkt_serialize_exit(ifp->if_serializer); 438 return (error); 439 } 440 441 /* 442 * Protect from NETISR_IP traversing address list while we're modifying 443 * it. 444 */ 445 lwkt_serialize_enter(ifp->if_serializer); 446 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 447 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link); 448 LIST_REMOVE(ia, ia_hash); 449 IFAFREE(&ia->ia_ifa); 450 lwkt_serialize_exit(ifp->if_serializer); 451 452 return (error); 453 } 454 455 /* 456 * SIOC[GAD]LIFADDR. 457 * SIOCGLIFADDR: get first address. (?!?) 458 * SIOCGLIFADDR with IFLR_PREFIX: 459 * get first address that matches the specified prefix. 460 * SIOCALIFADDR: add the specified address. 461 * SIOCALIFADDR with IFLR_PREFIX: 462 * EINVAL since we can't deduce hostid part of the address. 463 * SIOCDLIFADDR: delete the specified address. 464 * SIOCDLIFADDR with IFLR_PREFIX: 465 * delete the first address that matches the specified prefix. 466 * return values: 467 * EINVAL on invalid parameters 468 * EADDRNOTAVAIL on prefix match failed/specified address not found 469 * other values may be returned from in_ioctl() 470 * 471 * NOTE! td might be NULL. 472 */ 473 static int 474 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 475 struct thread *td) 476 { 477 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 478 struct ifaddr *ifa; 479 480 /* sanity checks */ 481 if (!data || !ifp) { 482 panic("invalid argument to in_lifaddr_ioctl"); 483 /*NOTRECHED*/ 484 } 485 486 switch (cmd) { 487 case SIOCGLIFADDR: 488 /* address must be specified on GET with IFLR_PREFIX */ 489 if ((iflr->flags & IFLR_PREFIX) == 0) 490 break; 491 /*FALLTHROUGH*/ 492 case SIOCALIFADDR: 493 case SIOCDLIFADDR: 494 /* address must be specified on ADD and DELETE */ 495 if (iflr->addr.ss_family != AF_INET) 496 return EINVAL; 497 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 498 return EINVAL; 499 /* XXX need improvement */ 500 if (iflr->dstaddr.ss_family 501 && iflr->dstaddr.ss_family != AF_INET) 502 return EINVAL; 503 if (iflr->dstaddr.ss_family 504 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 505 return EINVAL; 506 break; 507 default: /*shouldn't happen*/ 508 return EOPNOTSUPP; 509 } 510 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 511 return EINVAL; 512 513 switch (cmd) { 514 case SIOCALIFADDR: 515 { 516 struct in_aliasreq ifra; 517 518 if (iflr->flags & IFLR_PREFIX) 519 return EINVAL; 520 521 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 522 bzero(&ifra, sizeof ifra); 523 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name); 524 525 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 526 527 if (iflr->dstaddr.ss_family) { /*XXX*/ 528 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 529 iflr->dstaddr.ss_len); 530 } 531 532 ifra.ifra_mask.sin_family = AF_INET; 533 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 534 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 535 536 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 537 } 538 case SIOCGLIFADDR: 539 case SIOCDLIFADDR: 540 { 541 struct in_ifaddr *ia; 542 struct in_addr mask, candidate, match; 543 struct sockaddr_in *sin; 544 int cmp; 545 546 bzero(&mask, sizeof mask); 547 if (iflr->flags & IFLR_PREFIX) { 548 /* lookup a prefix rather than address. */ 549 in_len2mask(&mask, iflr->prefixlen); 550 551 sin = (struct sockaddr_in *)&iflr->addr; 552 match.s_addr = sin->sin_addr.s_addr; 553 match.s_addr &= mask.s_addr; 554 555 /* if you set extra bits, that's wrong */ 556 if (match.s_addr != sin->sin_addr.s_addr) 557 return EINVAL; 558 559 cmp = 1; 560 } else { 561 if (cmd == SIOCGLIFADDR) { 562 /* on getting an address, take the 1st match */ 563 match.s_addr = 0; /* gcc4 warning */ 564 cmp = 0; /*XXX*/ 565 } else { 566 /* on deleting an address, do exact match */ 567 in_len2mask(&mask, 32); 568 sin = (struct sockaddr_in *)&iflr->addr; 569 match.s_addr = sin->sin_addr.s_addr; 570 571 cmp = 1; 572 } 573 } 574 575 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 576 if (ifa->ifa_addr->sa_family != AF_INET6) 577 continue; 578 if (!cmp) 579 break; 580 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 581 candidate.s_addr &= mask.s_addr; 582 if (candidate.s_addr == match.s_addr) 583 break; 584 } 585 if (!ifa) 586 return EADDRNOTAVAIL; 587 ia = (struct in_ifaddr *)ifa; 588 589 if (cmd == SIOCGLIFADDR) { 590 /* fill in the if_laddrreq structure */ 591 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 592 593 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 594 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 595 ia->ia_dstaddr.sin_len); 596 } else 597 bzero(&iflr->dstaddr, sizeof iflr->dstaddr); 598 599 iflr->prefixlen = 600 in_mask2len(&ia->ia_sockmask.sin_addr); 601 602 iflr->flags = 0; /*XXX*/ 603 604 return 0; 605 } else { 606 struct in_aliasreq ifra; 607 608 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 609 bzero(&ifra, sizeof ifra); 610 bcopy(iflr->iflr_name, ifra.ifra_name, 611 sizeof ifra.ifra_name); 612 613 bcopy(&ia->ia_addr, &ifra.ifra_addr, 614 ia->ia_addr.sin_len); 615 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 616 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 617 ia->ia_dstaddr.sin_len); 618 } 619 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 620 ia->ia_sockmask.sin_len); 621 622 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 623 ifp, td); 624 } 625 } 626 } 627 628 return EOPNOTSUPP; /*just for safety*/ 629 } 630 631 /* 632 * Delete any existing route for an interface. 633 */ 634 void 635 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia) 636 { 637 638 if ((ia->ia_flags & IFA_ROUTE) == 0) 639 return; 640 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) 641 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 642 else 643 rtinit(&ia->ia_ifa, RTM_DELETE, 0); 644 ia->ia_flags &= ~IFA_ROUTE; 645 } 646 647 /* 648 * Initialize an interface's internet address 649 * and routing table entry. 650 */ 651 static int 652 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, int scrub) 653 { 654 u_long i = ntohl(sin->sin_addr.s_addr); 655 struct sockaddr_in oldaddr; 656 int flags = RTF_UP, error = 0; 657 658 lwkt_serialize_enter(ifp->if_serializer); 659 660 oldaddr = ia->ia_addr; 661 if (oldaddr.sin_family == AF_INET) 662 LIST_REMOVE(ia, ia_hash); 663 ia->ia_addr = *sin; 664 if (ia->ia_addr.sin_family == AF_INET) 665 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 666 ia, ia_hash); 667 /* 668 * Give the interface a chance to initialize 669 * if this is its first address, 670 * and to validate the address if necessary. 671 */ 672 if (ifp->if_ioctl && 673 (error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL))) { 674 lwkt_serialize_exit(ifp->if_serializer); 675 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 676 ia->ia_addr = oldaddr; 677 if (ia->ia_addr.sin_family == AF_INET) 678 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 679 ia, ia_hash); 680 return (error); 681 } 682 lwkt_serialize_exit(ifp->if_serializer); 683 if (scrub) { 684 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 685 in_ifscrub(ifp, ia); 686 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 687 } 688 if (IN_CLASSA(i)) 689 ia->ia_netmask = IN_CLASSA_NET; 690 else if (IN_CLASSB(i)) 691 ia->ia_netmask = IN_CLASSB_NET; 692 else 693 ia->ia_netmask = IN_CLASSC_NET; 694 /* 695 * The subnet mask usually includes at least the standard network part, 696 * but may may be smaller in the case of supernetting. 697 * If it is set, we believe it. 698 */ 699 if (ia->ia_subnetmask == 0) { 700 ia->ia_subnetmask = ia->ia_netmask; 701 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 702 } else 703 ia->ia_netmask &= ia->ia_subnetmask; 704 ia->ia_net = i & ia->ia_netmask; 705 ia->ia_subnet = i & ia->ia_subnetmask; 706 in_socktrim(&ia->ia_sockmask); 707 /* 708 * Add route for the network. 709 */ 710 ia->ia_ifa.ifa_metric = ifp->if_metric; 711 if (ifp->if_flags & IFF_BROADCAST) { 712 ia->ia_broadaddr.sin_addr.s_addr = 713 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 714 ia->ia_netbroadcast.s_addr = 715 htonl(ia->ia_net | ~ ia->ia_netmask); 716 } else if (ifp->if_flags & IFF_LOOPBACK) { 717 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr; 718 flags |= RTF_HOST; 719 } else if (ifp->if_flags & IFF_POINTOPOINT) { 720 if (ia->ia_dstaddr.sin_family != AF_INET) 721 return (0); 722 flags |= RTF_HOST; 723 } 724 725 /*- 726 * Don't add host routes for interface addresses of 727 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it 728 * possible to assign several such address pairs with consistent 729 * results (no host route) and is required by BOOTP. 730 * 731 * XXX: This is ugly ! There should be a way for the caller to 732 * say that they don't want a host route. 733 */ 734 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY || 735 ia->ia_netmask != IN_CLASSA_NET || 736 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) { 737 if ((error = rtinit(&ia->ia_ifa, (int)RTM_ADD, flags)) != 0) { 738 ia->ia_addr = oldaddr; 739 return (error); 740 } 741 ia->ia_flags |= IFA_ROUTE; 742 } 743 744 /* 745 * If the interface supports multicast, join the "all hosts" 746 * multicast group on that interface. 747 */ 748 if (ifp->if_flags & IFF_MULTICAST) { 749 struct in_addr addr; 750 751 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 752 in_addmulti(&addr, ifp); 753 } 754 return (error); 755 } 756 757 758 /* 759 * Return 1 if the address might be a local broadcast address. 760 */ 761 int 762 in_broadcast(struct in_addr in, struct ifnet *ifp) 763 { 764 struct ifaddr *ifa; 765 u_long t; 766 767 if (in.s_addr == INADDR_BROADCAST || 768 in.s_addr == INADDR_ANY) 769 return 1; 770 if ((ifp->if_flags & IFF_BROADCAST) == 0) 771 return 0; 772 t = ntohl(in.s_addr); 773 /* 774 * Look through the list of addresses for a match 775 * with a broadcast address. 776 */ 777 #define ia ((struct in_ifaddr *)ifa) 778 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 779 if (ifa->ifa_addr->sa_family == AF_INET && 780 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 781 in.s_addr == ia->ia_netbroadcast.s_addr || 782 /* 783 * Check for old-style (host 0) broadcast. 784 */ 785 t == ia->ia_subnet || t == ia->ia_net) && 786 /* 787 * Check for an all one subnetmask. These 788 * only exist when an interface gets a secondary 789 * address. 790 */ 791 ia->ia_subnetmask != (u_long)0xffffffff) 792 return 1; 793 return (0); 794 #undef ia 795 } 796 /* 797 * Add an address to the list of IP multicast addresses for a given interface. 798 */ 799 struct in_multi * 800 in_addmulti(struct in_addr *ap, struct ifnet *ifp) 801 { 802 struct in_multi *inm; 803 int error; 804 struct sockaddr_in sin; 805 struct ifmultiaddr *ifma; 806 807 /* 808 * Call generic routine to add membership or increment 809 * refcount. It wants addresses in the form of a sockaddr, 810 * so we build one here (being careful to zero the unused bytes). 811 */ 812 bzero(&sin, sizeof sin); 813 sin.sin_family = AF_INET; 814 sin.sin_len = sizeof sin; 815 sin.sin_addr = *ap; 816 crit_enter(); 817 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 818 if (error) { 819 crit_exit(); 820 return 0; 821 } 822 823 /* 824 * If ifma->ifma_protospec is null, then if_addmulti() created 825 * a new record. Otherwise, we are done. 826 */ 827 if (ifma->ifma_protospec != 0) { 828 crit_exit(); 829 return ifma->ifma_protospec; 830 } 831 832 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 833 at interrupt time? If so, need to fix if_addmulti. XXX */ 834 inm = kmalloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO); 835 inm->inm_addr = *ap; 836 inm->inm_ifp = ifp; 837 inm->inm_ifma = ifma; 838 ifma->ifma_protospec = inm; 839 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 840 841 /* 842 * Let IGMP know that we have joined a new IP multicast group. 843 */ 844 igmp_joingroup(inm); 845 crit_exit(); 846 return (inm); 847 } 848 849 /* 850 * Delete a multicast address record. 851 */ 852 void 853 in_delmulti(struct in_multi *inm) 854 { 855 struct ifmultiaddr *ifma; 856 struct in_multi my_inm; 857 858 crit_enter(); 859 ifma = inm->inm_ifma; 860 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 861 if (ifma->ifma_refcount == 1) { 862 /* 863 * No remaining claims to this record; let IGMP know that 864 * we are leaving the multicast group. 865 * But do it after the if_delmulti() which might reset 866 * the interface and nuke the packet. 867 */ 868 my_inm = *inm ; 869 ifma->ifma_protospec = 0; 870 LIST_REMOVE(inm, inm_link); 871 kfree(inm, M_IPMADDR); 872 } 873 /* XXX - should be separate API for when we have an ifma? */ 874 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 875 if (my_inm.inm_ifp != NULL) 876 igmp_leavegroup(&my_inm); 877 crit_exit(); 878 } 879 880 void 881 in_ifdetach(struct ifnet *ifp) 882 { 883 in_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp); 884 in_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp); 885 } 886