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 1.26 2008/03/07 11:34:20 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 *, 72 struct in_ifaddr *, 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 *ia; 98 99 if (subnetsarelocal) { 100 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 101 if ((i & ia->ia_netmask) == ia->ia_net) 102 return (1); 103 } else { 104 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 105 if ((i & ia->ia_subnetmask) == ia->ia_subnet) 106 return (1); 107 } 108 return (0); 109 } 110 111 /* 112 * Determine whether an IP address is in a reserved set of addresses 113 * that may not be forwarded, or whether datagrams to that destination 114 * may be forwarded. 115 */ 116 int 117 in_canforward(struct in_addr in) 118 { 119 u_long i = ntohl(in.s_addr); 120 u_long net; 121 122 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i)) 123 return (0); 124 if (IN_CLASSA(i)) { 125 net = i & IN_CLASSA_NET; 126 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 127 return (0); 128 } 129 return (1); 130 } 131 132 /* 133 * Trim a mask in a sockaddr 134 */ 135 static void 136 in_socktrim(struct sockaddr_in *ap) 137 { 138 char *cplim = (char *) &ap->sin_addr; 139 char *cp = (char *) (&ap->sin_addr + 1); 140 141 ap->sin_len = 0; 142 while (--cp >= cplim) 143 if (*cp) { 144 (ap)->sin_len = cp - (char *) (ap) + 1; 145 break; 146 } 147 } 148 149 static int 150 in_mask2len(struct in_addr *mask) 151 { 152 int x, y; 153 u_char *p; 154 155 p = (u_char *)mask; 156 for (x = 0; x < sizeof *mask; x++) { 157 if (p[x] != 0xff) 158 break; 159 } 160 y = 0; 161 if (x < sizeof *mask) { 162 for (y = 0; y < 8; y++) { 163 if ((p[x] & (0x80 >> y)) == 0) 164 break; 165 } 166 } 167 return x * 8 + y; 168 } 169 170 static void 171 in_len2mask(struct in_addr *mask, int len) 172 { 173 int i; 174 u_char *p; 175 176 p = (u_char *)mask; 177 bzero(mask, sizeof *mask); 178 for (i = 0; i < len / 8; i++) 179 p[i] = 0xff; 180 if (len % 8) 181 p[i] = (0xff00 >> (len % 8)) & 0xff; 182 } 183 184 static int in_interfaces; /* number of external internet interfaces */ 185 186 struct in_control_arg { 187 u_long cmd; 188 caddr_t data; 189 struct ifnet *ifp; 190 struct thread *td; 191 }; 192 193 static void 194 in_control_dispatch(struct netmsg *nmsg) 195 { 196 struct lwkt_msg *msg = &nmsg->nm_lmsg; 197 const struct in_control_arg *arg = msg->u.ms_resultp; 198 int error; 199 200 error = in_control_internal(arg->cmd, arg->data, arg->ifp, arg->td); 201 lwkt_replymsg(msg, error); 202 } 203 204 /* 205 * Generic internet control operations (ioctl's). 206 * Ifp is 0 if not an interface-specific ioctl. 207 * 208 * NOTE! td might be NULL. 209 */ 210 /* ARGSUSED */ 211 int 212 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 213 struct thread *td) 214 { 215 struct netmsg nmsg; 216 struct in_control_arg arg; 217 struct lwkt_msg *msg; 218 int error; 219 220 switch (cmd) { 221 case SIOCALIFADDR: 222 case SIOCDLIFADDR: 223 if (td && (error = suser(td)) != 0) 224 return error; 225 /*fall through*/ 226 case SIOCGLIFADDR: 227 if (!ifp) 228 return EINVAL; 229 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 230 } 231 232 KASSERT(cmd != SIOCALIFADDR && cmd != SIOCDLIFADDR, 233 ("recursive SIOC%cLIFADDR!\n", 234 cmd == SIOCDLIFADDR ? 'D' : 'A')); 235 236 switch (cmd) { 237 case SIOCSIFDSTADDR: 238 case SIOCSIFBRDADDR: 239 case SIOCSIFADDR: 240 case SIOCSIFNETMASK: 241 case SIOCAIFADDR: 242 case SIOCDIFADDR: 243 bzero(&arg, sizeof(arg)); 244 arg.cmd = cmd; 245 arg.data = data; 246 arg.ifp = ifp; 247 arg.td = td; 248 249 netmsg_init(&nmsg, &curthread->td_msgport, 0, 250 in_control_dispatch); 251 msg = &nmsg.nm_lmsg; 252 msg->u.ms_resultp = &arg; 253 254 lwkt_domsg(cpu_portfn(0), msg, 0); 255 return msg->ms_error; 256 default: 257 return in_control_internal(cmd, data, ifp, td); 258 } 259 } 260 261 static int 262 in_control_internal(u_long cmd, caddr_t data, struct ifnet *ifp, 263 struct thread *td) 264 { 265 struct ifreq *ifr = (struct ifreq *)data; 266 struct in_ifaddr *ia = 0, *iap; 267 struct in_addr dst; 268 struct in_ifaddr *oia; 269 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 270 struct sockaddr_in oldaddr; 271 int hostIsNew, iaIsNew, maskIsNew; 272 int error = 0; 273 274 iaIsNew = 0; 275 276 /* 277 * Find address for this interface, if it exists. 278 * 279 * If an alias address was specified, find that one instead of 280 * the first one on the interface, if possible 281 */ 282 if (ifp) { 283 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 284 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) 285 if (iap->ia_ifp == ifp && 286 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 287 ia = iap; 288 break; 289 } 290 if (ia == NULL) { 291 struct ifaddr_container *ifac; 292 293 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], 294 ifa_link) { 295 iap = ifatoia(ifac->ifa); 296 if (iap->ia_addr.sin_family == AF_INET) { 297 ia = iap; 298 break; 299 } 300 } 301 } 302 } 303 304 switch (cmd) { 305 306 case SIOCAIFADDR: 307 case SIOCDIFADDR: 308 if (ifp == NULL) 309 return (EADDRNOTAVAIL); 310 if (ifra->ifra_addr.sin_family == AF_INET) { 311 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 312 if (ia->ia_ifp == ifp && 313 ia->ia_addr.sin_addr.s_addr == 314 ifra->ifra_addr.sin_addr.s_addr) 315 break; 316 } 317 if ((ifp->if_flags & IFF_POINTOPOINT) 318 && (cmd == SIOCAIFADDR) 319 && (ifra->ifra_dstaddr.sin_addr.s_addr 320 == INADDR_ANY)) { 321 return EDESTADDRREQ; 322 } 323 } 324 if (cmd == SIOCDIFADDR && ia == NULL) 325 return (EADDRNOTAVAIL); 326 /* FALLTHROUGH */ 327 case SIOCSIFADDR: 328 case SIOCSIFNETMASK: 329 case SIOCSIFDSTADDR: 330 if (td && (error = suser(td)) != 0) 331 return error; 332 333 if (ifp == NULL) 334 return (EADDRNOTAVAIL); 335 if (ia == NULL) { 336 struct ifaddr *ifa; 337 338 ia = ifa_create(sizeof(*ia), M_WAITOK); 339 340 /* 341 * Protect from NETISR_IP traversing address list 342 * while we're modifying it. 343 */ 344 crit_enter(); 345 346 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link); 347 ifa = &ia->ia_ifa; 348 ifa_iflink(ifa, ifp, 1); 349 350 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 351 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 352 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 353 ia->ia_sockmask.sin_len = 8; 354 ia->ia_sockmask.sin_family = AF_INET; 355 if (ifp->if_flags & IFF_BROADCAST) { 356 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr; 357 ia->ia_broadaddr.sin_family = AF_INET; 358 } 359 ia->ia_ifp = ifp; 360 if (!(ifp->if_flags & IFF_LOOPBACK)) 361 in_interfaces++; 362 iaIsNew = 1; 363 crit_exit(); 364 } 365 break; 366 367 case SIOCSIFBRDADDR: 368 if (td && (error = suser(td)) != 0) 369 return error; 370 /* FALLTHROUGH */ 371 372 case SIOCGIFADDR: 373 case SIOCGIFNETMASK: 374 case SIOCGIFDSTADDR: 375 case SIOCGIFBRDADDR: 376 if (ia == NULL) 377 return (EADDRNOTAVAIL); 378 break; 379 } 380 switch (cmd) { 381 382 case SIOCGIFADDR: 383 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 384 return (0); 385 386 case SIOCGIFBRDADDR: 387 if ((ifp->if_flags & IFF_BROADCAST) == 0) 388 return (EINVAL); 389 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 390 return (0); 391 392 case SIOCGIFDSTADDR: 393 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 394 return (EINVAL); 395 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 396 return (0); 397 398 case SIOCGIFNETMASK: 399 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 400 return (0); 401 402 case SIOCSIFDSTADDR: 403 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 404 return (EINVAL); 405 oldaddr = ia->ia_dstaddr; 406 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 407 lwkt_serialize_enter(ifp->if_serializer); 408 if (ifp->if_ioctl && 409 (error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia, 410 td->td_proc->p_ucred))) { 411 ia->ia_dstaddr = oldaddr; 412 lwkt_serialize_exit(ifp->if_serializer); 413 return (error); 414 } 415 if (ia->ia_flags & IFA_ROUTE) { 416 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 417 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 418 ia->ia_ifa.ifa_dstaddr = 419 (struct sockaddr *)&ia->ia_dstaddr; 420 rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP); 421 } 422 lwkt_serialize_exit(ifp->if_serializer); 423 return (0); 424 425 case SIOCSIFBRDADDR: 426 if ((ifp->if_flags & IFF_BROADCAST) == 0) 427 return (EINVAL); 428 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 429 return (0); 430 431 case SIOCSIFADDR: 432 error = in_ifinit(ifp, ia, 433 (struct sockaddr_in *) &ifr->ifr_addr, 1); 434 if (error != 0 && iaIsNew) 435 break; 436 if (error == 0) 437 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 438 return (0); 439 440 case SIOCSIFNETMASK: 441 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 442 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 443 return (0); 444 445 case SIOCAIFADDR: 446 maskIsNew = 0; 447 hostIsNew = 1; 448 error = 0; 449 if (ia->ia_addr.sin_family == AF_INET) { 450 if (ifra->ifra_addr.sin_len == 0) { 451 ifra->ifra_addr = ia->ia_addr; 452 hostIsNew = 0; 453 } else if (ifra->ifra_addr.sin_addr.s_addr == 454 ia->ia_addr.sin_addr.s_addr) 455 hostIsNew = 0; 456 } 457 if (ifra->ifra_mask.sin_len) { 458 in_ifscrub(ifp, ia); 459 ia->ia_sockmask = ifra->ifra_mask; 460 ia->ia_sockmask.sin_family = AF_INET; 461 ia->ia_subnetmask = 462 ntohl(ia->ia_sockmask.sin_addr.s_addr); 463 maskIsNew = 1; 464 } 465 if ((ifp->if_flags & IFF_POINTOPOINT) && 466 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 467 in_ifscrub(ifp, ia); 468 ia->ia_dstaddr = ifra->ifra_dstaddr; 469 maskIsNew = 1; /* We lie; but the effect's the same */ 470 } 471 if (ifra->ifra_addr.sin_family == AF_INET && 472 (hostIsNew || maskIsNew)) 473 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 474 475 if (error != 0 && iaIsNew) 476 break; 477 478 if ((ifp->if_flags & IFF_BROADCAST) && 479 (ifra->ifra_broadaddr.sin_family == AF_INET)) 480 ia->ia_broadaddr = ifra->ifra_broadaddr; 481 if (error == 0) 482 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 483 return (error); 484 485 case SIOCDIFADDR: 486 /* 487 * in_ifscrub kills the interface route. 488 */ 489 in_ifscrub(ifp, ia); 490 /* 491 * in_ifadown gets rid of all the rest of 492 * the routes. This is not quite the right 493 * thing to do, but at least if we are running 494 * a routing process they will come back. 495 */ 496 in_ifadown(&ia->ia_ifa, 1); 497 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 498 error = 0; 499 break; 500 501 default: 502 if (ifp == NULL || ifp->if_ioctl == NULL) 503 return (EOPNOTSUPP); 504 lwkt_serialize_enter(ifp->if_serializer); 505 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred); 506 lwkt_serialize_exit(ifp->if_serializer); 507 return (error); 508 } 509 510 ifa_ifunlink(&ia->ia_ifa, ifp); 511 512 /* 513 * Protect from NETISR_IP traversing address list while we're modifying 514 * it. 515 */ 516 crit_enter(); /* XXX MP */ 517 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link); 518 LIST_REMOVE(ia, ia_hash); 519 crit_exit(); /* XXX MP */ 520 521 ifa_destroy(&ia->ia_ifa); 522 523 return (error); 524 } 525 526 /* 527 * SIOC[GAD]LIFADDR. 528 * SIOCGLIFADDR: get first address. (?!?) 529 * SIOCGLIFADDR with IFLR_PREFIX: 530 * get first address that matches the specified prefix. 531 * SIOCALIFADDR: add the specified address. 532 * SIOCALIFADDR with IFLR_PREFIX: 533 * EINVAL since we can't deduce hostid part of the address. 534 * SIOCDLIFADDR: delete the specified address. 535 * SIOCDLIFADDR with IFLR_PREFIX: 536 * delete the first address that matches the specified prefix. 537 * return values: 538 * EINVAL on invalid parameters 539 * EADDRNOTAVAIL on prefix match failed/specified address not found 540 * other values may be returned from in_ioctl() 541 * 542 * NOTE! td might be NULL. 543 */ 544 static int 545 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 546 struct thread *td) 547 { 548 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 549 550 /* sanity checks */ 551 if (!data || !ifp) { 552 panic("invalid argument to in_lifaddr_ioctl"); 553 /*NOTRECHED*/ 554 } 555 556 switch (cmd) { 557 case SIOCGLIFADDR: 558 /* address must be specified on GET with IFLR_PREFIX */ 559 if ((iflr->flags & IFLR_PREFIX) == 0) 560 break; 561 /*FALLTHROUGH*/ 562 case SIOCALIFADDR: 563 case SIOCDLIFADDR: 564 /* address must be specified on ADD and DELETE */ 565 if (iflr->addr.ss_family != AF_INET) 566 return EINVAL; 567 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 568 return EINVAL; 569 /* XXX need improvement */ 570 if (iflr->dstaddr.ss_family 571 && iflr->dstaddr.ss_family != AF_INET) 572 return EINVAL; 573 if (iflr->dstaddr.ss_family 574 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 575 return EINVAL; 576 break; 577 default: /*shouldn't happen*/ 578 return EOPNOTSUPP; 579 } 580 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 581 return EINVAL; 582 583 switch (cmd) { 584 case SIOCALIFADDR: 585 { 586 struct in_aliasreq ifra; 587 588 if (iflr->flags & IFLR_PREFIX) 589 return EINVAL; 590 591 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 592 bzero(&ifra, sizeof ifra); 593 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name); 594 595 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 596 597 if (iflr->dstaddr.ss_family) { /*XXX*/ 598 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 599 iflr->dstaddr.ss_len); 600 } 601 602 ifra.ifra_mask.sin_family = AF_INET; 603 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 604 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 605 606 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td); 607 } 608 case SIOCGLIFADDR: 609 case SIOCDLIFADDR: 610 { 611 struct ifaddr_container *ifac; 612 struct in_ifaddr *ia; 613 struct in_addr mask, candidate, match; 614 struct sockaddr_in *sin; 615 int cmp; 616 617 bzero(&mask, sizeof mask); 618 if (iflr->flags & IFLR_PREFIX) { 619 /* lookup a prefix rather than address. */ 620 in_len2mask(&mask, iflr->prefixlen); 621 622 sin = (struct sockaddr_in *)&iflr->addr; 623 match.s_addr = sin->sin_addr.s_addr; 624 match.s_addr &= mask.s_addr; 625 626 /* if you set extra bits, that's wrong */ 627 if (match.s_addr != sin->sin_addr.s_addr) 628 return EINVAL; 629 630 cmp = 1; 631 } else { 632 if (cmd == SIOCGLIFADDR) { 633 /* on getting an address, take the 1st match */ 634 match.s_addr = 0; /* gcc4 warning */ 635 cmp = 0; /*XXX*/ 636 } else { 637 /* on deleting an address, do exact match */ 638 in_len2mask(&mask, 32); 639 sin = (struct sockaddr_in *)&iflr->addr; 640 match.s_addr = sin->sin_addr.s_addr; 641 642 cmp = 1; 643 } 644 } 645 646 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 647 struct ifaddr *ifa = ifac->ifa; 648 649 if (ifa->ifa_addr->sa_family != AF_INET6) 650 continue; 651 if (!cmp) 652 break; 653 candidate.s_addr = 654 ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 655 candidate.s_addr &= mask.s_addr; 656 if (candidate.s_addr == match.s_addr) 657 break; 658 } 659 if (ifac == NULL) 660 return EADDRNOTAVAIL; 661 ia = (struct in_ifaddr *)(ifac->ifa); 662 663 if (cmd == SIOCGLIFADDR) { 664 /* fill in the if_laddrreq structure */ 665 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 666 667 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 668 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 669 ia->ia_dstaddr.sin_len); 670 } else 671 bzero(&iflr->dstaddr, sizeof iflr->dstaddr); 672 673 iflr->prefixlen = 674 in_mask2len(&ia->ia_sockmask.sin_addr); 675 676 iflr->flags = 0; /*XXX*/ 677 678 return 0; 679 } else { 680 struct in_aliasreq ifra; 681 682 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 683 bzero(&ifra, sizeof ifra); 684 bcopy(iflr->iflr_name, ifra.ifra_name, 685 sizeof ifra.ifra_name); 686 687 bcopy(&ia->ia_addr, &ifra.ifra_addr, 688 ia->ia_addr.sin_len); 689 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 690 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 691 ia->ia_dstaddr.sin_len); 692 } 693 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 694 ia->ia_sockmask.sin_len); 695 696 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 697 ifp, td); 698 } 699 } 700 } 701 702 return EOPNOTSUPP; /*just for safety*/ 703 } 704 705 /* 706 * Delete any existing route for an interface. 707 */ 708 void 709 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia) 710 { 711 712 if ((ia->ia_flags & IFA_ROUTE) == 0) 713 return; 714 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT)) 715 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST); 716 else 717 rtinit(&ia->ia_ifa, RTM_DELETE, 0); 718 ia->ia_flags &= ~IFA_ROUTE; 719 } 720 721 /* 722 * Initialize an interface's internet address 723 * and routing table entry. 724 */ 725 static int 726 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, int scrub) 727 { 728 u_long i = ntohl(sin->sin_addr.s_addr); 729 struct sockaddr_in oldaddr; 730 int flags = RTF_UP, error = 0; 731 732 lwkt_serialize_enter(ifp->if_serializer); 733 734 oldaddr = ia->ia_addr; 735 if (oldaddr.sin_family == AF_INET) 736 LIST_REMOVE(ia, ia_hash); 737 ia->ia_addr = *sin; 738 if (ia->ia_addr.sin_family == AF_INET) 739 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 740 ia, ia_hash); 741 /* 742 * Give the interface a chance to initialize 743 * if this is its first address, 744 * and to validate the address if necessary. 745 */ 746 if (ifp->if_ioctl && 747 (error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL))) { 748 lwkt_serialize_exit(ifp->if_serializer); 749 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 750 ia->ia_addr = oldaddr; 751 if (ia->ia_addr.sin_family == AF_INET) 752 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 753 ia, ia_hash); 754 return (error); 755 } 756 lwkt_serialize_exit(ifp->if_serializer); 757 if (scrub) { 758 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 759 in_ifscrub(ifp, ia); 760 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 761 } 762 if (IN_CLASSA(i)) 763 ia->ia_netmask = IN_CLASSA_NET; 764 else if (IN_CLASSB(i)) 765 ia->ia_netmask = IN_CLASSB_NET; 766 else 767 ia->ia_netmask = IN_CLASSC_NET; 768 /* 769 * The subnet mask usually includes at least the standard network part, 770 * but may may be smaller in the case of supernetting. 771 * If it is set, we believe it. 772 */ 773 if (ia->ia_subnetmask == 0) { 774 ia->ia_subnetmask = ia->ia_netmask; 775 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 776 } else 777 ia->ia_netmask &= ia->ia_subnetmask; 778 ia->ia_net = i & ia->ia_netmask; 779 ia->ia_subnet = i & ia->ia_subnetmask; 780 in_socktrim(&ia->ia_sockmask); 781 /* 782 * Add route for the network. 783 */ 784 ia->ia_ifa.ifa_metric = ifp->if_metric; 785 if (ifp->if_flags & IFF_BROADCAST) { 786 ia->ia_broadaddr.sin_addr.s_addr = 787 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 788 ia->ia_netbroadcast.s_addr = 789 htonl(ia->ia_net | ~ ia->ia_netmask); 790 } else if (ifp->if_flags & IFF_LOOPBACK) { 791 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr; 792 flags |= RTF_HOST; 793 } else if (ifp->if_flags & IFF_POINTOPOINT) { 794 if (ia->ia_dstaddr.sin_family != AF_INET) 795 return (0); 796 flags |= RTF_HOST; 797 } 798 799 /*- 800 * Don't add host routes for interface addresses of 801 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it 802 * possible to assign several such address pairs with consistent 803 * results (no host route) and is required by BOOTP. 804 * 805 * XXX: This is ugly ! There should be a way for the caller to 806 * say that they don't want a host route. 807 */ 808 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY || 809 ia->ia_netmask != IN_CLASSA_NET || 810 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) { 811 if ((error = rtinit(&ia->ia_ifa, (int)RTM_ADD, flags)) != 0) { 812 ia->ia_addr = oldaddr; 813 return (error); 814 } 815 ia->ia_flags |= IFA_ROUTE; 816 } 817 818 /* 819 * If the interface supports multicast, join the "all hosts" 820 * multicast group on that interface. 821 */ 822 if (ifp->if_flags & IFF_MULTICAST) { 823 struct in_addr addr; 824 825 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 826 in_addmulti(&addr, ifp); 827 } 828 return (error); 829 } 830 831 832 /* 833 * Return 1 if the address might be a local broadcast address. 834 */ 835 int 836 in_broadcast(struct in_addr in, struct ifnet *ifp) 837 { 838 struct ifaddr_container *ifac; 839 u_long t; 840 841 if (in.s_addr == INADDR_BROADCAST || 842 in.s_addr == INADDR_ANY) 843 return 1; 844 if ((ifp->if_flags & IFF_BROADCAST) == 0) 845 return 0; 846 t = ntohl(in.s_addr); 847 /* 848 * Look through the list of addresses for a match 849 * with a broadcast address. 850 */ 851 #define ia ((struct in_ifaddr *)ifa) 852 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 853 struct ifaddr *ifa = ifac->ifa; 854 855 if (ifa->ifa_addr->sa_family == AF_INET && 856 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 857 in.s_addr == ia->ia_netbroadcast.s_addr || 858 /* 859 * Check for old-style (host 0) broadcast. 860 */ 861 t == ia->ia_subnet || t == ia->ia_net) && 862 /* 863 * Check for an all one subnetmask. These 864 * only exist when an interface gets a secondary 865 * address. 866 */ 867 ia->ia_subnetmask != (u_long)0xffffffff) 868 return 1; 869 } 870 return (0); 871 #undef ia 872 } 873 /* 874 * Add an address to the list of IP multicast addresses for a given interface. 875 */ 876 struct in_multi * 877 in_addmulti(struct in_addr *ap, struct ifnet *ifp) 878 { 879 struct in_multi *inm; 880 int error; 881 struct sockaddr_in sin; 882 struct ifmultiaddr *ifma; 883 884 /* 885 * Call generic routine to add membership or increment 886 * refcount. It wants addresses in the form of a sockaddr, 887 * so we build one here (being careful to zero the unused bytes). 888 */ 889 bzero(&sin, sizeof sin); 890 sin.sin_family = AF_INET; 891 sin.sin_len = sizeof sin; 892 sin.sin_addr = *ap; 893 crit_enter(); 894 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma); 895 if (error) { 896 crit_exit(); 897 return 0; 898 } 899 900 /* 901 * If ifma->ifma_protospec is null, then if_addmulti() created 902 * a new record. Otherwise, we are done. 903 */ 904 if (ifma->ifma_protospec != 0) { 905 crit_exit(); 906 return ifma->ifma_protospec; 907 } 908 909 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 910 at interrupt time? If so, need to fix if_addmulti. XXX */ 911 inm = kmalloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO); 912 inm->inm_addr = *ap; 913 inm->inm_ifp = ifp; 914 inm->inm_ifma = ifma; 915 ifma->ifma_protospec = inm; 916 LIST_INSERT_HEAD(&in_multihead, inm, inm_link); 917 918 /* 919 * Let IGMP know that we have joined a new IP multicast group. 920 */ 921 igmp_joingroup(inm); 922 crit_exit(); 923 return (inm); 924 } 925 926 /* 927 * Delete a multicast address record. 928 */ 929 void 930 in_delmulti(struct in_multi *inm) 931 { 932 struct ifmultiaddr *ifma; 933 struct in_multi my_inm; 934 935 crit_enter(); 936 ifma = inm->inm_ifma; 937 my_inm.inm_ifp = NULL ; /* don't send the leave msg */ 938 if (ifma->ifma_refcount == 1) { 939 /* 940 * No remaining claims to this record; let IGMP know that 941 * we are leaving the multicast group. 942 * But do it after the if_delmulti() which might reset 943 * the interface and nuke the packet. 944 */ 945 my_inm = *inm ; 946 ifma->ifma_protospec = 0; 947 LIST_REMOVE(inm, inm_link); 948 kfree(inm, M_IPMADDR); 949 } 950 /* XXX - should be separate API for when we have an ifma? */ 951 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 952 if (my_inm.inm_ifp != NULL) 953 igmp_leavegroup(&my_inm); 954 crit_exit(); 955 } 956 957 void 958 in_ifdetach(struct ifnet *ifp) 959 { 960 in_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp); 961 in_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp); 962 } 963