1 /*- 2 * Copyright (c) 1982, 1986, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (C) 2001 WIDE Project. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 4. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * @(#)in.c 8.4 (Berkeley) 1/9/95 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include "opt_carp.h" 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/sockio.h> 41 #include <sys/malloc.h> 42 #include <sys/priv.h> 43 #include <sys/socket.h> 44 #include <sys/jail.h> 45 #include <sys/kernel.h> 46 #include <sys/proc.h> 47 #include <sys/sysctl.h> 48 #include <sys/syslog.h> 49 50 #include <net/if.h> 51 #include <net/if_var.h> 52 #include <net/if_dl.h> 53 #include <net/if_llatbl.h> 54 #include <net/if_types.h> 55 #include <net/route.h> 56 #include <net/vnet.h> 57 58 #include <netinet/in.h> 59 #include <netinet/in_var.h> 60 #include <netinet/in_pcb.h> 61 #include <netinet/ip_var.h> 62 #include <netinet/igmp_var.h> 63 #include <netinet/udp.h> 64 #include <netinet/udp_var.h> 65 66 static int in_mask2len(struct in_addr *); 67 static void in_len2mask(struct in_addr *, int); 68 static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, 69 struct ifnet *, struct thread *); 70 71 static int in_addprefix(struct in_ifaddr *, int); 72 static int in_scrubprefix(struct in_ifaddr *); 73 static void in_socktrim(struct sockaddr_in *); 74 static int in_ifinit(struct ifnet *, 75 struct in_ifaddr *, struct sockaddr_in *, int); 76 static void in_purgemaddrs(struct ifnet *); 77 78 static VNET_DEFINE(int, subnetsarelocal); 79 static VNET_DEFINE(int, sameprefixcarponly); 80 VNET_DECLARE(struct inpcbinfo, ripcbinfo); 81 82 #define V_subnetsarelocal VNET(subnetsarelocal) 83 #define V_sameprefixcarponly VNET(sameprefixcarponly) 84 #define V_ripcbinfo VNET(ripcbinfo) 85 86 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 87 &VNET_NAME(subnetsarelocal), 0, 88 "Treat all subnets as directly connected"); 89 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, same_prefix_carp_only, CTLFLAG_RW, 90 &VNET_NAME(sameprefixcarponly), 0, 91 "Refuse to create same prefixes on different interfaces"); 92 93 /* 94 * Return 1 if an internet address is for a ``local'' host 95 * (one to which we have a connection). If subnetsarelocal 96 * is true, this includes other subnets of the local net. 97 * Otherwise, it includes only the directly-connected (sub)nets. 98 */ 99 int 100 in_localaddr(struct in_addr in) 101 { 102 register u_long i = ntohl(in.s_addr); 103 register struct in_ifaddr *ia; 104 105 IN_IFADDR_RLOCK(); 106 if (V_subnetsarelocal) { 107 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 108 if ((i & ia->ia_netmask) == ia->ia_net) { 109 IN_IFADDR_RUNLOCK(); 110 return (1); 111 } 112 } 113 } else { 114 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 115 if ((i & ia->ia_subnetmask) == ia->ia_subnet) { 116 IN_IFADDR_RUNLOCK(); 117 return (1); 118 } 119 } 120 } 121 IN_IFADDR_RUNLOCK(); 122 return (0); 123 } 124 125 /* 126 * Return 1 if an internet address is for the local host and configured 127 * on one of its interfaces. 128 */ 129 int 130 in_localip(struct in_addr in) 131 { 132 struct in_ifaddr *ia; 133 134 IN_IFADDR_RLOCK(); 135 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { 136 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) { 137 IN_IFADDR_RUNLOCK(); 138 return (1); 139 } 140 } 141 IN_IFADDR_RUNLOCK(); 142 return (0); 143 } 144 145 /* 146 * Determine whether an IP address is in a reserved set of addresses 147 * that may not be forwarded, or whether datagrams to that destination 148 * may be forwarded. 149 */ 150 int 151 in_canforward(struct in_addr in) 152 { 153 register u_long i = ntohl(in.s_addr); 154 register u_long net; 155 156 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i)) 157 return (0); 158 if (IN_CLASSA(i)) { 159 net = i & IN_CLASSA_NET; 160 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 161 return (0); 162 } 163 return (1); 164 } 165 166 /* 167 * Trim a mask in a sockaddr 168 */ 169 static void 170 in_socktrim(struct sockaddr_in *ap) 171 { 172 register char *cplim = (char *) &ap->sin_addr; 173 register char *cp = (char *) (&ap->sin_addr + 1); 174 175 ap->sin_len = 0; 176 while (--cp >= cplim) 177 if (*cp) { 178 (ap)->sin_len = cp - (char *) (ap) + 1; 179 break; 180 } 181 } 182 183 static int 184 in_mask2len(mask) 185 struct in_addr *mask; 186 { 187 int x, y; 188 u_char *p; 189 190 p = (u_char *)mask; 191 for (x = 0; x < sizeof(*mask); x++) { 192 if (p[x] != 0xff) 193 break; 194 } 195 y = 0; 196 if (x < sizeof(*mask)) { 197 for (y = 0; y < 8; y++) { 198 if ((p[x] & (0x80 >> y)) == 0) 199 break; 200 } 201 } 202 return (x * 8 + y); 203 } 204 205 static void 206 in_len2mask(struct in_addr *mask, int len) 207 { 208 int i; 209 u_char *p; 210 211 p = (u_char *)mask; 212 bzero(mask, sizeof(*mask)); 213 for (i = 0; i < len / 8; i++) 214 p[i] = 0xff; 215 if (len % 8) 216 p[i] = (0xff00 >> (len % 8)) & 0xff; 217 } 218 219 /* 220 * Generic internet control operations (ioctl's). 221 * 222 * ifp is NULL if not an interface-specific ioctl. 223 */ 224 /* ARGSUSED */ 225 int 226 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 227 struct thread *td) 228 { 229 register struct ifreq *ifr = (struct ifreq *)data; 230 register struct in_ifaddr *ia, *iap; 231 register struct ifaddr *ifa; 232 struct in_addr allhosts_addr; 233 struct in_addr dst; 234 struct in_ifinfo *ii; 235 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 236 struct sockaddr_in oldaddr; 237 int error, hostIsNew, iaIsNew, maskIsNew; 238 int iaIsFirst; 239 240 ia = NULL; 241 iaIsFirst = 0; 242 iaIsNew = 0; 243 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 244 245 /* 246 * Filter out ioctls we implement directly; forward the rest on to 247 * in_lifaddr_ioctl() and ifp->if_ioctl(). 248 */ 249 switch (cmd) { 250 case SIOCAIFADDR: 251 case SIOCDIFADDR: 252 case SIOCGIFADDR: 253 case SIOCGIFBRDADDR: 254 case SIOCGIFDSTADDR: 255 case SIOCGIFNETMASK: 256 case SIOCSIFADDR: 257 case SIOCSIFBRDADDR: 258 case SIOCSIFDSTADDR: 259 case SIOCSIFNETMASK: 260 break; 261 262 case SIOCALIFADDR: 263 if (td != NULL) { 264 error = priv_check(td, PRIV_NET_ADDIFADDR); 265 if (error) 266 return (error); 267 } 268 if (ifp == NULL) 269 return (EINVAL); 270 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 271 272 case SIOCDLIFADDR: 273 if (td != NULL) { 274 error = priv_check(td, PRIV_NET_DELIFADDR); 275 if (error) 276 return (error); 277 } 278 if (ifp == NULL) 279 return (EINVAL); 280 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 281 282 case SIOCGLIFADDR: 283 if (ifp == NULL) 284 return (EINVAL); 285 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 286 287 default: 288 if (ifp == NULL || ifp->if_ioctl == NULL) 289 return (EOPNOTSUPP); 290 return ((*ifp->if_ioctl)(ifp, cmd, data)); 291 } 292 293 if (ifp == NULL) 294 return (EADDRNOTAVAIL); 295 296 /* 297 * Security checks before we get involved in any work. 298 */ 299 switch (cmd) { 300 case SIOCAIFADDR: 301 case SIOCSIFADDR: 302 case SIOCSIFBRDADDR: 303 case SIOCSIFNETMASK: 304 case SIOCSIFDSTADDR: 305 if (td != NULL) { 306 error = priv_check(td, PRIV_NET_ADDIFADDR); 307 if (error) 308 return (error); 309 } 310 break; 311 312 case SIOCDIFADDR: 313 if (td != NULL) { 314 error = priv_check(td, PRIV_NET_DELIFADDR); 315 if (error) 316 return (error); 317 } 318 break; 319 } 320 321 /* 322 * Find address for this interface, if it exists. 323 * 324 * If an alias address was specified, find that one instead of the 325 * first one on the interface, if possible. 326 */ 327 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 328 IN_IFADDR_RLOCK(); 329 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) { 330 if (iap->ia_ifp == ifp && 331 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 332 if (td == NULL || prison_check_ip4(td->td_ucred, 333 &dst) == 0) 334 ia = iap; 335 break; 336 } 337 } 338 if (ia != NULL) 339 ifa_ref(&ia->ia_ifa); 340 IN_IFADDR_RUNLOCK(); 341 if (ia == NULL) { 342 IF_ADDR_LOCK(ifp); 343 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 344 iap = ifatoia(ifa); 345 if (iap->ia_addr.sin_family == AF_INET) { 346 if (td != NULL && 347 prison_check_ip4(td->td_ucred, 348 &iap->ia_addr.sin_addr) != 0) 349 continue; 350 ia = iap; 351 break; 352 } 353 } 354 if (ia != NULL) 355 ifa_ref(&ia->ia_ifa); 356 IF_ADDR_UNLOCK(ifp); 357 } 358 if (ia == NULL) 359 iaIsFirst = 1; 360 361 error = 0; 362 switch (cmd) { 363 case SIOCAIFADDR: 364 case SIOCDIFADDR: 365 if (ifra->ifra_addr.sin_family == AF_INET) { 366 struct in_ifaddr *oia; 367 368 IN_IFADDR_RLOCK(); 369 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 370 if (ia->ia_ifp == ifp && 371 ia->ia_addr.sin_addr.s_addr == 372 ifra->ifra_addr.sin_addr.s_addr) 373 break; 374 } 375 if (ia != NULL && ia != oia) 376 ifa_ref(&ia->ia_ifa); 377 if (oia != NULL && ia != oia) 378 ifa_free(&oia->ia_ifa); 379 IN_IFADDR_RUNLOCK(); 380 if ((ifp->if_flags & IFF_POINTOPOINT) 381 && (cmd == SIOCAIFADDR) 382 && (ifra->ifra_dstaddr.sin_addr.s_addr 383 == INADDR_ANY)) { 384 error = EDESTADDRREQ; 385 goto out; 386 } 387 } 388 if (cmd == SIOCDIFADDR && ia == NULL) { 389 error = EADDRNOTAVAIL; 390 goto out; 391 } 392 /* FALLTHROUGH */ 393 case SIOCSIFADDR: 394 case SIOCSIFNETMASK: 395 case SIOCSIFDSTADDR: 396 if (ia == NULL) { 397 ia = (struct in_ifaddr *) 398 malloc(sizeof *ia, M_IFADDR, M_NOWAIT | 399 M_ZERO); 400 if (ia == NULL) { 401 error = ENOBUFS; 402 goto out; 403 } 404 405 ifa = &ia->ia_ifa; 406 ifa_init(ifa); 407 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 408 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 409 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 410 411 ia->ia_sockmask.sin_len = 8; 412 ia->ia_sockmask.sin_family = AF_INET; 413 if (ifp->if_flags & IFF_BROADCAST) { 414 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 415 ia->ia_broadaddr.sin_family = AF_INET; 416 } 417 ia->ia_ifp = ifp; 418 419 ifa_ref(ifa); /* if_addrhead */ 420 IF_ADDR_LOCK(ifp); 421 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 422 IF_ADDR_UNLOCK(ifp); 423 ifa_ref(ifa); /* in_ifaddrhead */ 424 IN_IFADDR_WLOCK(); 425 TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link); 426 IN_IFADDR_WUNLOCK(); 427 iaIsNew = 1; 428 } 429 break; 430 431 case SIOCSIFBRDADDR: 432 case SIOCGIFADDR: 433 case SIOCGIFNETMASK: 434 case SIOCGIFDSTADDR: 435 case SIOCGIFBRDADDR: 436 if (ia == NULL) { 437 error = EADDRNOTAVAIL; 438 goto out; 439 } 440 break; 441 } 442 443 /* 444 * Most paths in this switch return directly or via out. Only paths 445 * that remove the address break in order to hit common removal code. 446 */ 447 switch (cmd) { 448 case SIOCGIFADDR: 449 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 450 goto out; 451 452 case SIOCGIFBRDADDR: 453 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 454 error = EINVAL; 455 goto out; 456 } 457 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 458 goto out; 459 460 case SIOCGIFDSTADDR: 461 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 462 error = EINVAL; 463 goto out; 464 } 465 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 466 goto out; 467 468 case SIOCGIFNETMASK: 469 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 470 goto out; 471 472 case SIOCSIFDSTADDR: 473 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 474 error = EINVAL; 475 goto out; 476 } 477 oldaddr = ia->ia_dstaddr; 478 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 479 if (ifp->if_ioctl != NULL) { 480 error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, 481 (caddr_t)ia); 482 if (error) { 483 ia->ia_dstaddr = oldaddr; 484 goto out; 485 } 486 } 487 if (ia->ia_flags & IFA_ROUTE) { 488 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 489 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 490 ia->ia_ifa.ifa_dstaddr = 491 (struct sockaddr *)&ia->ia_dstaddr; 492 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 493 } 494 goto out; 495 496 case SIOCSIFBRDADDR: 497 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 498 error = EINVAL; 499 goto out; 500 } 501 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 502 goto out; 503 504 case SIOCSIFADDR: 505 error = in_ifinit(ifp, ia, 506 (struct sockaddr_in *) &ifr->ifr_addr, 1); 507 if (error != 0 && iaIsNew) 508 break; 509 if (error == 0) { 510 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 511 if (iaIsFirst && 512 (ifp->if_flags & IFF_MULTICAST) != 0) { 513 error = in_joingroup(ifp, &allhosts_addr, 514 NULL, &ii->ii_allhosts); 515 } 516 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 517 } 518 error = 0; 519 goto out; 520 521 case SIOCSIFNETMASK: 522 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 523 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 524 goto out; 525 526 case SIOCAIFADDR: 527 maskIsNew = 0; 528 hostIsNew = 1; 529 error = 0; 530 if (ia->ia_addr.sin_family == AF_INET) { 531 if (ifra->ifra_addr.sin_len == 0) { 532 ifra->ifra_addr = ia->ia_addr; 533 hostIsNew = 0; 534 } else if (ifra->ifra_addr.sin_addr.s_addr == 535 ia->ia_addr.sin_addr.s_addr) 536 hostIsNew = 0; 537 } 538 if (ifra->ifra_mask.sin_len) { 539 ia->ia_sockmask = ifra->ifra_mask; 540 ia->ia_sockmask.sin_family = AF_INET; 541 ia->ia_subnetmask = 542 ntohl(ia->ia_sockmask.sin_addr.s_addr); 543 maskIsNew = 1; 544 } 545 if ((ifp->if_flags & IFF_POINTOPOINT) && 546 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 547 ia->ia_dstaddr = ifra->ifra_dstaddr; 548 maskIsNew = 1; /* We lie; but the effect's the same */ 549 } 550 if (ifra->ifra_addr.sin_family == AF_INET && 551 (hostIsNew || maskIsNew)) 552 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 553 if (error != 0 && iaIsNew) 554 goto out; 555 556 if ((ifp->if_flags & IFF_BROADCAST) && 557 (ifra->ifra_broadaddr.sin_family == AF_INET)) 558 ia->ia_broadaddr = ifra->ifra_broadaddr; 559 if (error == 0) { 560 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 561 if (iaIsFirst && 562 (ifp->if_flags & IFF_MULTICAST) != 0) { 563 error = in_joingroup(ifp, &allhosts_addr, 564 NULL, &ii->ii_allhosts); 565 } 566 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 567 } 568 goto out; 569 570 case SIOCDIFADDR: 571 /* 572 * in_ifscrub kills the interface route. 573 */ 574 in_ifscrub(ifp, ia); 575 576 /* 577 * in_ifadown gets rid of all the rest of 578 * the routes. This is not quite the right 579 * thing to do, but at least if we are running 580 * a routing process they will come back. 581 */ 582 in_ifadown(&ia->ia_ifa, 1); 583 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 584 error = 0; 585 break; 586 587 default: 588 panic("in_control: unsupported ioctl"); 589 } 590 591 IF_ADDR_LOCK(ifp); 592 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 593 IF_ADDR_UNLOCK(ifp); 594 ifa_free(&ia->ia_ifa); /* if_addrhead */ 595 596 IN_IFADDR_WLOCK(); 597 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link); 598 if (ia->ia_addr.sin_family == AF_INET) { 599 struct in_ifaddr *if_ia; 600 601 LIST_REMOVE(ia, ia_hash); 602 IN_IFADDR_WUNLOCK(); 603 /* 604 * If this is the last IPv4 address configured on this 605 * interface, leave the all-hosts group. 606 * No state-change report need be transmitted. 607 */ 608 if_ia = NULL; 609 IFP_TO_IA(ifp, if_ia); 610 if (if_ia == NULL) { 611 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 612 IN_MULTI_LOCK(); 613 if (ii->ii_allhosts) { 614 (void)in_leavegroup_locked(ii->ii_allhosts, 615 NULL); 616 ii->ii_allhosts = NULL; 617 } 618 IN_MULTI_UNLOCK(); 619 } else 620 ifa_free(&if_ia->ia_ifa); 621 } else 622 IN_IFADDR_WUNLOCK(); 623 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 624 out: 625 if (ia != NULL) 626 ifa_free(&ia->ia_ifa); 627 return (error); 628 } 629 630 /* 631 * SIOC[GAD]LIFADDR. 632 * SIOCGLIFADDR: get first address. (?!?) 633 * SIOCGLIFADDR with IFLR_PREFIX: 634 * get first address that matches the specified prefix. 635 * SIOCALIFADDR: add the specified address. 636 * SIOCALIFADDR with IFLR_PREFIX: 637 * EINVAL since we can't deduce hostid part of the address. 638 * SIOCDLIFADDR: delete the specified address. 639 * SIOCDLIFADDR with IFLR_PREFIX: 640 * delete the first address that matches the specified prefix. 641 * return values: 642 * EINVAL on invalid parameters 643 * EADDRNOTAVAIL on prefix match failed/specified address not found 644 * other values may be returned from in_ioctl() 645 */ 646 static int 647 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 648 struct ifnet *ifp, struct thread *td) 649 { 650 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 651 struct ifaddr *ifa; 652 653 /* sanity checks */ 654 if (data == NULL || ifp == NULL) { 655 panic("invalid argument to in_lifaddr_ioctl"); 656 /*NOTRECHED*/ 657 } 658 659 switch (cmd) { 660 case SIOCGLIFADDR: 661 /* address must be specified on GET with IFLR_PREFIX */ 662 if ((iflr->flags & IFLR_PREFIX) == 0) 663 break; 664 /*FALLTHROUGH*/ 665 case SIOCALIFADDR: 666 case SIOCDLIFADDR: 667 /* address must be specified on ADD and DELETE */ 668 if (iflr->addr.ss_family != AF_INET) 669 return (EINVAL); 670 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 671 return (EINVAL); 672 /* XXX need improvement */ 673 if (iflr->dstaddr.ss_family 674 && iflr->dstaddr.ss_family != AF_INET) 675 return (EINVAL); 676 if (iflr->dstaddr.ss_family 677 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 678 return (EINVAL); 679 break; 680 default: /*shouldn't happen*/ 681 return (EOPNOTSUPP); 682 } 683 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 684 return (EINVAL); 685 686 switch (cmd) { 687 case SIOCALIFADDR: 688 { 689 struct in_aliasreq ifra; 690 691 if (iflr->flags & IFLR_PREFIX) 692 return (EINVAL); 693 694 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 695 bzero(&ifra, sizeof(ifra)); 696 bcopy(iflr->iflr_name, ifra.ifra_name, 697 sizeof(ifra.ifra_name)); 698 699 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 700 701 if (iflr->dstaddr.ss_family) { /*XXX*/ 702 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 703 iflr->dstaddr.ss_len); 704 } 705 706 ifra.ifra_mask.sin_family = AF_INET; 707 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 708 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 709 710 return (in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td)); 711 } 712 case SIOCGLIFADDR: 713 case SIOCDLIFADDR: 714 { 715 struct in_ifaddr *ia; 716 struct in_addr mask, candidate, match; 717 struct sockaddr_in *sin; 718 719 bzero(&mask, sizeof(mask)); 720 bzero(&match, sizeof(match)); 721 if (iflr->flags & IFLR_PREFIX) { 722 /* lookup a prefix rather than address. */ 723 in_len2mask(&mask, iflr->prefixlen); 724 725 sin = (struct sockaddr_in *)&iflr->addr; 726 match.s_addr = sin->sin_addr.s_addr; 727 match.s_addr &= mask.s_addr; 728 729 /* if you set extra bits, that's wrong */ 730 if (match.s_addr != sin->sin_addr.s_addr) 731 return (EINVAL); 732 733 } else { 734 /* on getting an address, take the 1st match */ 735 /* on deleting an address, do exact match */ 736 if (cmd != SIOCGLIFADDR) { 737 in_len2mask(&mask, 32); 738 sin = (struct sockaddr_in *)&iflr->addr; 739 match.s_addr = sin->sin_addr.s_addr; 740 } 741 } 742 743 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 744 if (ifa->ifa_addr->sa_family != AF_INET6) 745 continue; 746 if (match.s_addr == 0) 747 break; 748 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 749 candidate.s_addr &= mask.s_addr; 750 if (candidate.s_addr == match.s_addr) 751 break; 752 } 753 if (ifa == NULL) 754 return (EADDRNOTAVAIL); 755 ia = (struct in_ifaddr *)ifa; 756 757 if (cmd == SIOCGLIFADDR) { 758 /* fill in the if_laddrreq structure */ 759 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 760 761 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 762 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 763 ia->ia_dstaddr.sin_len); 764 } else 765 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 766 767 iflr->prefixlen = 768 in_mask2len(&ia->ia_sockmask.sin_addr); 769 770 iflr->flags = 0; /*XXX*/ 771 772 return (0); 773 } else { 774 struct in_aliasreq ifra; 775 776 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 777 bzero(&ifra, sizeof(ifra)); 778 bcopy(iflr->iflr_name, ifra.ifra_name, 779 sizeof(ifra.ifra_name)); 780 781 bcopy(&ia->ia_addr, &ifra.ifra_addr, 782 ia->ia_addr.sin_len); 783 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 784 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 785 ia->ia_dstaddr.sin_len); 786 } 787 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 788 ia->ia_sockmask.sin_len); 789 790 return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 791 ifp, td)); 792 } 793 } 794 } 795 796 return (EOPNOTSUPP); /*just for safety*/ 797 } 798 799 /* 800 * Delete any existing route for an interface. 801 */ 802 void 803 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia) 804 { 805 806 in_scrubprefix(ia); 807 } 808 809 /* 810 * Initialize an interface's internet address 811 * and routing table entry. 812 */ 813 static int 814 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, 815 int scrub) 816 { 817 register u_long i = ntohl(sin->sin_addr.s_addr); 818 struct sockaddr_in oldaddr; 819 struct rtentry *rt = NULL; 820 struct rt_addrinfo info; 821 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 822 int s = splimp(), flags = RTF_UP, error = 0; 823 824 oldaddr = ia->ia_addr; 825 if (oldaddr.sin_family == AF_INET) 826 LIST_REMOVE(ia, ia_hash); 827 ia->ia_addr = *sin; 828 if (ia->ia_addr.sin_family == AF_INET) { 829 IN_IFADDR_WLOCK(); 830 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 831 ia, ia_hash); 832 IN_IFADDR_WUNLOCK(); 833 } 834 /* 835 * Give the interface a chance to initialize 836 * if this is its first address, 837 * and to validate the address if necessary. 838 */ 839 if (ifp->if_ioctl != NULL) { 840 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 841 if (error) { 842 splx(s); 843 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 844 ia->ia_addr = oldaddr; 845 IN_IFADDR_WLOCK(); 846 if (ia->ia_addr.sin_family == AF_INET) 847 LIST_INSERT_HEAD(INADDR_HASH( 848 ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 849 else 850 /* 851 * If oldaddr family is not AF_INET (e.g. 852 * interface has been just created) in_control 853 * does not call LIST_REMOVE, and we end up 854 * with bogus ia entries in hash 855 */ 856 LIST_REMOVE(ia, ia_hash); 857 IN_IFADDR_WUNLOCK(); 858 return (error); 859 } 860 } 861 splx(s); 862 if (scrub) { 863 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 864 in_ifscrub(ifp, ia); 865 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 866 } 867 if (IN_CLASSA(i)) 868 ia->ia_netmask = IN_CLASSA_NET; 869 else if (IN_CLASSB(i)) 870 ia->ia_netmask = IN_CLASSB_NET; 871 else 872 ia->ia_netmask = IN_CLASSC_NET; 873 /* 874 * The subnet mask usually includes at least the standard network part, 875 * but may may be smaller in the case of supernetting. 876 * If it is set, we believe it. 877 */ 878 if (ia->ia_subnetmask == 0) { 879 ia->ia_subnetmask = ia->ia_netmask; 880 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 881 } else 882 ia->ia_netmask &= ia->ia_subnetmask; 883 ia->ia_net = i & ia->ia_netmask; 884 ia->ia_subnet = i & ia->ia_subnetmask; 885 in_socktrim(&ia->ia_sockmask); 886 #ifdef DEV_CARP 887 /* 888 * XXX: carp(4) does not have interface route 889 */ 890 if (ifp->if_type == IFT_CARP) 891 return (0); 892 #endif 893 /* 894 * Add route for the network. 895 */ 896 ia->ia_ifa.ifa_metric = ifp->if_metric; 897 if (ifp->if_flags & IFF_BROADCAST) { 898 ia->ia_broadaddr.sin_addr.s_addr = 899 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 900 ia->ia_netbroadcast.s_addr = 901 htonl(ia->ia_net | ~ ia->ia_netmask); 902 } else if (ifp->if_flags & IFF_LOOPBACK) { 903 ia->ia_dstaddr = ia->ia_addr; 904 flags |= RTF_HOST; 905 } else if (ifp->if_flags & IFF_POINTOPOINT) { 906 if (ia->ia_dstaddr.sin_family != AF_INET) 907 return (0); 908 flags |= RTF_HOST; 909 } 910 if ((error = in_addprefix(ia, flags)) != 0) 911 return (error); 912 913 if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY) 914 return (0); 915 916 /* 917 * add a loopback route to self 918 */ 919 if (V_useloopback && !(ifp->if_flags & IFF_LOOPBACK)) { 920 bzero(&info, sizeof(info)); 921 info.rti_ifp = V_loif; 922 info.rti_flags = ia->ia_flags | RTF_HOST | RTF_STATIC; 923 info.rti_info[RTAX_DST] = (struct sockaddr *)&ia->ia_addr; 924 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 925 error = rtrequest1_fib(RTM_ADD, &info, &rt, 0); 926 927 if (error == 0 && rt != NULL) { 928 RT_LOCK(rt); 929 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 930 rt->rt_ifp->if_type; 931 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 932 rt->rt_ifp->if_index; 933 RT_REMREF(rt); 934 RT_UNLOCK(rt); 935 } else if (error != 0) 936 log(LOG_INFO, "in_ifinit: insertion failed\n"); 937 } 938 939 return (error); 940 } 941 942 #define rtinitflags(x) \ 943 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 944 ? RTF_HOST : 0) 945 /* 946 * Check if we have a route for the given prefix already or add one accordingly. 947 */ 948 static int 949 in_addprefix(struct in_ifaddr *target, int flags) 950 { 951 struct in_ifaddr *ia; 952 struct in_addr prefix, mask, p, m; 953 int error; 954 955 if ((flags & RTF_HOST) != 0) { 956 prefix = target->ia_dstaddr.sin_addr; 957 mask.s_addr = 0; 958 } else { 959 prefix = target->ia_addr.sin_addr; 960 mask = target->ia_sockmask.sin_addr; 961 prefix.s_addr &= mask.s_addr; 962 } 963 964 IN_IFADDR_RLOCK(); 965 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 966 if (rtinitflags(ia)) { 967 p = ia->ia_addr.sin_addr; 968 969 if (prefix.s_addr != p.s_addr) 970 continue; 971 } else { 972 p = ia->ia_addr.sin_addr; 973 m = ia->ia_sockmask.sin_addr; 974 p.s_addr &= m.s_addr; 975 976 if (prefix.s_addr != p.s_addr || 977 mask.s_addr != m.s_addr) 978 continue; 979 } 980 981 /* 982 * If we got a matching prefix route inserted by other 983 * interface address, we are done here. 984 */ 985 if (ia->ia_flags & IFA_ROUTE) { 986 if (V_sameprefixcarponly && 987 target->ia_ifp->if_type != IFT_CARP && 988 ia->ia_ifp->if_type != IFT_CARP) { 989 IN_IFADDR_RUNLOCK(); 990 return (EEXIST); 991 } else { 992 struct route pfx_ro; 993 struct sockaddr_in *pfx_addr; 994 struct rtentry msg_rt; 995 996 /* QL: XXX 997 * This is a bit questionable because there is no 998 * additional route entry added for an address alias. 999 * Therefore this route report is inaccurate. Perhaps 1000 * it's better to supply a empty rtentry as how it 1001 * is done in in_scrubprefix(). 1002 */ 1003 bzero(&pfx_ro, sizeof(pfx_ro)); 1004 pfx_addr = (struct sockaddr_in *)(&pfx_ro.ro_dst); 1005 pfx_addr->sin_len = sizeof(*pfx_addr); 1006 pfx_addr->sin_family = AF_INET; 1007 pfx_addr->sin_addr = prefix; 1008 rtalloc_ign_fib(&pfx_ro, 0, 0); 1009 if (pfx_ro.ro_rt != NULL) { 1010 msg_rt = *pfx_ro.ro_rt; 1011 /* QL: XXX 1012 * Point the gateway to the given interface 1013 * address as if a new prefix route entry has 1014 * been added through the new address alias. 1015 * All other parts of the rtentry is accurate, 1016 * e.g., rt_key, rt_mask, rt_ifp etc. 1017 */ 1018 msg_rt.rt_gateway = 1019 (struct sockaddr *)&ia->ia_addr; 1020 rt_newaddrmsg(RTM_ADD, 1021 (struct ifaddr *)target, 1022 0, &msg_rt); 1023 RTFREE(pfx_ro.ro_rt); 1024 } 1025 1026 IN_IFADDR_RUNLOCK(); 1027 return (0); 1028 } 1029 } 1030 } 1031 IN_IFADDR_RUNLOCK(); 1032 1033 /* 1034 * No-one seem to have this prefix route, so we try to insert it. 1035 */ 1036 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 1037 if (!error) 1038 target->ia_flags |= IFA_ROUTE; 1039 return (error); 1040 } 1041 1042 extern void arp_ifscrub(struct ifnet *ifp, uint32_t addr); 1043 1044 /* 1045 * If there is no other address in the system that can serve a route to the 1046 * same prefix, remove the route. Hand over the route to the new address 1047 * otherwise. 1048 */ 1049 static int 1050 in_scrubprefix(struct in_ifaddr *target) 1051 { 1052 struct in_ifaddr *ia; 1053 struct in_addr prefix, mask, p; 1054 int error; 1055 struct sockaddr_in prefix0, mask0; 1056 struct rt_addrinfo info; 1057 struct sockaddr_dl null_sdl; 1058 1059 /* 1060 * Remove the loopback route to the interface address. 1061 * The "useloopback" setting is not consulted because if the 1062 * user configures an interface address, turns off this 1063 * setting, and then tries to delete that interface address, 1064 * checking the current setting of "useloopback" would leave 1065 * that interface address loopback route untouched, which 1066 * would be wrong. Therefore the interface address loopback route 1067 * deletion is unconditional. 1068 */ 1069 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) && 1070 !(target->ia_ifp->if_flags & IFF_LOOPBACK)) { 1071 bzero(&null_sdl, sizeof(null_sdl)); 1072 null_sdl.sdl_len = sizeof(null_sdl); 1073 null_sdl.sdl_family = AF_LINK; 1074 null_sdl.sdl_type = V_loif->if_type; 1075 null_sdl.sdl_index = V_loif->if_index; 1076 bzero(&info, sizeof(info)); 1077 info.rti_flags = target->ia_flags | RTF_HOST | RTF_STATIC; 1078 info.rti_info[RTAX_DST] = (struct sockaddr *)&target->ia_addr; 1079 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1080 error = rtrequest1_fib(RTM_DELETE, &info, NULL, 0); 1081 1082 if (error != 0) 1083 log(LOG_INFO, "in_scrubprefix: deletion failed\n"); 1084 } 1085 1086 if ((target->ia_flags & IFA_ROUTE) == 0) { 1087 struct rtentry rt; 1088 1089 /* QL: XXX 1090 * Report a blank rtentry when a route has not been 1091 * installed for the given interface address. 1092 */ 1093 bzero(&rt, sizeof(rt)); 1094 rt_newaddrmsg(RTM_DELETE, 1095 (struct ifaddr *)target, 1096 0, &rt); 1097 return (0); 1098 } 1099 1100 if (rtinitflags(target)) 1101 prefix = target->ia_dstaddr.sin_addr; 1102 else { 1103 prefix = target->ia_addr.sin_addr; 1104 mask = target->ia_sockmask.sin_addr; 1105 prefix.s_addr &= mask.s_addr; 1106 /* remove arp cache */ 1107 arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr); 1108 } 1109 1110 IN_IFADDR_RLOCK(); 1111 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1112 if (rtinitflags(ia)) 1113 p = ia->ia_dstaddr.sin_addr; 1114 else { 1115 p = ia->ia_addr.sin_addr; 1116 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1117 } 1118 1119 if (prefix.s_addr != p.s_addr) 1120 continue; 1121 1122 /* 1123 * If we got a matching prefix address, move IFA_ROUTE and 1124 * the route itself to it. Make sure that routing daemons 1125 * get a heads-up. 1126 * 1127 * XXX: a special case for carp(4) interface 1128 */ 1129 if ((ia->ia_flags & IFA_ROUTE) == 0 1130 #ifdef DEV_CARP 1131 && (ia->ia_ifp->if_type != IFT_CARP) 1132 #endif 1133 ) { 1134 IN_IFADDR_RUNLOCK(); 1135 rtinit(&(target->ia_ifa), (int)RTM_DELETE, 1136 rtinitflags(target)); 1137 target->ia_flags &= ~IFA_ROUTE; 1138 1139 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 1140 rtinitflags(ia) | RTF_UP); 1141 if (error == 0) 1142 ia->ia_flags |= IFA_ROUTE; 1143 return (error); 1144 } 1145 } 1146 IN_IFADDR_RUNLOCK(); 1147 1148 /* 1149 * remove all L2 entries on the given prefix 1150 */ 1151 bzero(&prefix0, sizeof(prefix0)); 1152 prefix0.sin_len = sizeof(prefix0); 1153 prefix0.sin_family = AF_INET; 1154 prefix0.sin_addr.s_addr = target->ia_subnet; 1155 bzero(&mask0, sizeof(mask0)); 1156 mask0.sin_len = sizeof(mask0); 1157 mask0.sin_family = AF_INET; 1158 mask0.sin_addr.s_addr = target->ia_subnetmask; 1159 lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0, 1160 (struct sockaddr *)&mask0); 1161 1162 /* 1163 * As no-one seem to have this prefix, we can remove the route. 1164 */ 1165 rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 1166 target->ia_flags &= ~IFA_ROUTE; 1167 return (0); 1168 } 1169 1170 #undef rtinitflags 1171 1172 /* 1173 * Return 1 if the address might be a local broadcast address. 1174 */ 1175 int 1176 in_broadcast(struct in_addr in, struct ifnet *ifp) 1177 { 1178 register struct ifaddr *ifa; 1179 u_long t; 1180 1181 if (in.s_addr == INADDR_BROADCAST || 1182 in.s_addr == INADDR_ANY) 1183 return (1); 1184 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1185 return (0); 1186 t = ntohl(in.s_addr); 1187 /* 1188 * Look through the list of addresses for a match 1189 * with a broadcast address. 1190 */ 1191 #define ia ((struct in_ifaddr *)ifa) 1192 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1193 if (ifa->ifa_addr->sa_family == AF_INET && 1194 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1195 in.s_addr == ia->ia_netbroadcast.s_addr || 1196 /* 1197 * Check for old-style (host 0) broadcast. 1198 */ 1199 t == ia->ia_subnet || t == ia->ia_net) && 1200 /* 1201 * Check for an all one subnetmask. These 1202 * only exist when an interface gets a secondary 1203 * address. 1204 */ 1205 ia->ia_subnetmask != (u_long)0xffffffff) 1206 return (1); 1207 return (0); 1208 #undef ia 1209 } 1210 1211 /* 1212 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 1213 */ 1214 void 1215 in_ifdetach(struct ifnet *ifp) 1216 { 1217 1218 in_pcbpurgeif0(&V_ripcbinfo, ifp); 1219 in_pcbpurgeif0(&V_udbinfo, ifp); 1220 in_purgemaddrs(ifp); 1221 } 1222 1223 /* 1224 * Delete all IPv4 multicast address records, and associated link-layer 1225 * multicast address records, associated with ifp. 1226 * XXX It looks like domifdetach runs AFTER the link layer cleanup. 1227 * XXX This should not race with ifma_protospec being set during 1228 * a new allocation, if it does, we have bigger problems. 1229 */ 1230 static void 1231 in_purgemaddrs(struct ifnet *ifp) 1232 { 1233 LIST_HEAD(,in_multi) purgeinms; 1234 struct in_multi *inm, *tinm; 1235 struct ifmultiaddr *ifma; 1236 1237 LIST_INIT(&purgeinms); 1238 IN_MULTI_LOCK(); 1239 1240 /* 1241 * Extract list of in_multi associated with the detaching ifp 1242 * which the PF_INET layer is about to release. 1243 * We need to do this as IF_ADDR_LOCK() may be re-acquired 1244 * by code further down. 1245 */ 1246 IF_ADDR_LOCK(ifp); 1247 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1248 if (ifma->ifma_addr->sa_family != AF_INET || 1249 ifma->ifma_protospec == NULL) 1250 continue; 1251 #if 0 1252 KASSERT(ifma->ifma_protospec != NULL, 1253 ("%s: ifma_protospec is NULL", __func__)); 1254 #endif 1255 inm = (struct in_multi *)ifma->ifma_protospec; 1256 LIST_INSERT_HEAD(&purgeinms, inm, inm_link); 1257 } 1258 IF_ADDR_UNLOCK(ifp); 1259 1260 LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) { 1261 LIST_REMOVE(inm, inm_link); 1262 inm_release_locked(inm); 1263 } 1264 igmp_ifdetach(ifp); 1265 1266 IN_MULTI_UNLOCK(); 1267 } 1268 1269 #include <net/if_dl.h> 1270 #include <netinet/if_ether.h> 1271 1272 struct in_llentry { 1273 struct llentry base; 1274 struct sockaddr_in l3_addr4; 1275 }; 1276 1277 static struct llentry * 1278 in_lltable_new(const struct sockaddr *l3addr, u_int flags) 1279 { 1280 struct in_llentry *lle; 1281 1282 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_DONTWAIT | M_ZERO); 1283 if (lle == NULL) /* NB: caller generates msg */ 1284 return NULL; 1285 1286 callout_init(&lle->base.la_timer, CALLOUT_MPSAFE); 1287 /* 1288 * For IPv4 this will trigger "arpresolve" to generate 1289 * an ARP request. 1290 */ 1291 lle->base.la_expire = time_second; /* mark expired */ 1292 lle->l3_addr4 = *(const struct sockaddr_in *)l3addr; 1293 lle->base.lle_refcnt = 1; 1294 LLE_LOCK_INIT(&lle->base); 1295 return &lle->base; 1296 } 1297 1298 /* 1299 * Deletes an address from the address table. 1300 * This function is called by the timer functions 1301 * such as arptimer() and nd6_llinfo_timer(), and 1302 * the caller does the locking. 1303 */ 1304 static void 1305 in_lltable_free(struct lltable *llt, struct llentry *lle) 1306 { 1307 LLE_WUNLOCK(lle); 1308 LLE_LOCK_DESTROY(lle); 1309 free(lle, M_LLTABLE); 1310 } 1311 1312 1313 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 1314 (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 ) 1315 1316 static void 1317 in_lltable_prefix_free(struct lltable *llt, 1318 const struct sockaddr *prefix, 1319 const struct sockaddr *mask) 1320 { 1321 const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix; 1322 const struct sockaddr_in *msk = (const struct sockaddr_in *)mask; 1323 struct llentry *lle, *next; 1324 register int i; 1325 1326 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) { 1327 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 1328 1329 if (IN_ARE_MASKED_ADDR_EQUAL((struct sockaddr_in *)L3_ADDR(lle), 1330 pfx, msk)) { 1331 callout_drain(&lle->la_timer); 1332 LLE_WLOCK(lle); 1333 llentry_free(lle); 1334 } 1335 } 1336 } 1337 } 1338 1339 1340 static int 1341 in_lltable_rtcheck(struct ifnet *ifp, const struct sockaddr *l3addr) 1342 { 1343 struct rtentry *rt; 1344 1345 KASSERT(l3addr->sa_family == AF_INET, 1346 ("sin_family %d", l3addr->sa_family)); 1347 1348 /* XXX rtalloc1 should take a const param */ 1349 rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0); 1350 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 1351 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n", 1352 inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr)); 1353 if (rt != NULL) 1354 RTFREE_LOCKED(rt); 1355 return (EINVAL); 1356 } 1357 RTFREE_LOCKED(rt); 1358 return 0; 1359 } 1360 1361 /* 1362 * Return NULL if not found or marked for deletion. 1363 * If found return lle read locked. 1364 */ 1365 static struct llentry * 1366 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1367 { 1368 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1369 struct ifnet *ifp = llt->llt_ifp; 1370 struct llentry *lle; 1371 struct llentries *lleh; 1372 u_int hashkey; 1373 1374 IF_AFDATA_LOCK_ASSERT(ifp); 1375 KASSERT(l3addr->sa_family == AF_INET, 1376 ("sin_family %d", l3addr->sa_family)); 1377 1378 hashkey = sin->sin_addr.s_addr; 1379 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 1380 LIST_FOREACH(lle, lleh, lle_next) { 1381 struct sockaddr_in *sa2 = (struct sockaddr_in *)L3_ADDR(lle); 1382 if (lle->la_flags & LLE_DELETED) 1383 continue; 1384 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr) 1385 break; 1386 } 1387 if (lle == NULL) { 1388 #ifdef DIAGNOSTICS 1389 if (flags & LLE_DELETE) 1390 log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle); 1391 #endif 1392 if (!(flags & LLE_CREATE)) 1393 return (NULL); 1394 /* 1395 * A route that covers the given address must have 1396 * been installed 1st because we are doing a resolution, 1397 * verify this. 1398 */ 1399 if (!(flags & LLE_IFADDR) && 1400 in_lltable_rtcheck(ifp, l3addr) != 0) 1401 goto done; 1402 1403 lle = in_lltable_new(l3addr, flags); 1404 if (lle == NULL) { 1405 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 1406 goto done; 1407 } 1408 lle->la_flags = flags & ~LLE_CREATE; 1409 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 1410 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 1411 lle->la_flags |= (LLE_VALID | LLE_STATIC); 1412 } 1413 1414 lle->lle_tbl = llt; 1415 lle->lle_head = lleh; 1416 LIST_INSERT_HEAD(lleh, lle, lle_next); 1417 } else if (flags & LLE_DELETE) { 1418 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 1419 LLE_WLOCK(lle); 1420 lle->la_flags = LLE_DELETED; 1421 LLE_WUNLOCK(lle); 1422 #ifdef DIAGNOSTICS 1423 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 1424 #endif 1425 } 1426 lle = (void *)-1; 1427 1428 } 1429 if (LLE_IS_VALID(lle)) { 1430 if (flags & LLE_EXCLUSIVE) 1431 LLE_WLOCK(lle); 1432 else 1433 LLE_RLOCK(lle); 1434 } 1435 done: 1436 return (lle); 1437 } 1438 1439 static int 1440 in_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 1441 { 1442 #define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle)) 1443 struct ifnet *ifp = llt->llt_ifp; 1444 struct llentry *lle; 1445 /* XXX stack use */ 1446 struct { 1447 struct rt_msghdr rtm; 1448 struct sockaddr_inarp sin; 1449 struct sockaddr_dl sdl; 1450 } arpc; 1451 int error, i; 1452 1453 LLTABLE_LOCK_ASSERT(); 1454 1455 error = 0; 1456 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1457 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 1458 struct sockaddr_dl *sdl; 1459 1460 /* skip deleted entries */ 1461 if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID) 1462 continue; 1463 /* Skip if jailed and not a valid IP of the prison. */ 1464 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 1465 continue; 1466 /* 1467 * produce a msg made of: 1468 * struct rt_msghdr; 1469 * struct sockaddr_inarp; (IPv4) 1470 * struct sockaddr_dl; 1471 */ 1472 bzero(&arpc, sizeof(arpc)); 1473 arpc.rtm.rtm_msglen = sizeof(arpc); 1474 arpc.rtm.rtm_version = RTM_VERSION; 1475 arpc.rtm.rtm_type = RTM_GET; 1476 arpc.rtm.rtm_flags = RTF_UP; 1477 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1478 arpc.sin.sin_family = AF_INET; 1479 arpc.sin.sin_len = sizeof(arpc.sin); 1480 arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr; 1481 1482 /* publish */ 1483 if (lle->la_flags & LLE_PUB) { 1484 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1485 /* proxy only */ 1486 if (lle->la_flags & LLE_PROXY) 1487 arpc.sin.sin_other = SIN_PROXY; 1488 } 1489 1490 sdl = &arpc.sdl; 1491 sdl->sdl_family = AF_LINK; 1492 sdl->sdl_len = sizeof(*sdl); 1493 sdl->sdl_alen = ifp->if_addrlen; 1494 sdl->sdl_index = ifp->if_index; 1495 sdl->sdl_type = ifp->if_type; 1496 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1497 1498 arpc.rtm.rtm_rmx.rmx_expire = 1499 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1500 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1501 if (lle->la_flags & LLE_STATIC) 1502 arpc.rtm.rtm_flags |= RTF_STATIC; 1503 arpc.rtm.rtm_index = ifp->if_index; 1504 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1505 if (error) 1506 break; 1507 } 1508 } 1509 return error; 1510 #undef SIN 1511 } 1512 1513 void * 1514 in_domifattach(struct ifnet *ifp) 1515 { 1516 struct in_ifinfo *ii; 1517 struct lltable *llt; 1518 1519 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); 1520 1521 llt = lltable_init(ifp, AF_INET); 1522 if (llt != NULL) { 1523 llt->llt_new = in_lltable_new; 1524 llt->llt_free = in_lltable_free; 1525 llt->llt_prefix_free = in_lltable_prefix_free; 1526 llt->llt_rtcheck = in_lltable_rtcheck; 1527 llt->llt_lookup = in_lltable_lookup; 1528 llt->llt_dump = in_lltable_dump; 1529 } 1530 ii->ii_llt = llt; 1531 1532 ii->ii_igmp = igmp_domifattach(ifp); 1533 1534 return ii; 1535 } 1536 1537 void 1538 in_domifdetach(struct ifnet *ifp, void *aux) 1539 { 1540 struct in_ifinfo *ii = (struct in_ifinfo *)aux; 1541 1542 igmp_domifdetach(ifp); 1543 lltable_free(ii->ii_llt); 1544 free(ii, M_IFADDR); 1545 } 1546