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 in_ifscrub(ifp, ia); 540 ia->ia_sockmask = ifra->ifra_mask; 541 ia->ia_sockmask.sin_family = AF_INET; 542 ia->ia_subnetmask = 543 ntohl(ia->ia_sockmask.sin_addr.s_addr); 544 maskIsNew = 1; 545 } 546 if ((ifp->if_flags & IFF_POINTOPOINT) && 547 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 548 in_ifscrub(ifp, ia); 549 ia->ia_dstaddr = ifra->ifra_dstaddr; 550 maskIsNew = 1; /* We lie; but the effect's the same */ 551 } 552 if (ifra->ifra_addr.sin_family == AF_INET && 553 (hostIsNew || maskIsNew)) 554 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 555 if (error != 0 && iaIsNew) 556 goto out; 557 558 if ((ifp->if_flags & IFF_BROADCAST) && 559 (ifra->ifra_broadaddr.sin_family == AF_INET)) 560 ia->ia_broadaddr = ifra->ifra_broadaddr; 561 if (error == 0) { 562 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 563 if (iaIsFirst && 564 (ifp->if_flags & IFF_MULTICAST) != 0) { 565 error = in_joingroup(ifp, &allhosts_addr, 566 NULL, &ii->ii_allhosts); 567 } 568 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 569 } 570 goto out; 571 572 case SIOCDIFADDR: 573 /* 574 * in_ifscrub kills the interface route. 575 */ 576 in_ifscrub(ifp, ia); 577 578 /* 579 * in_ifadown gets rid of all the rest of 580 * the routes. This is not quite the right 581 * thing to do, but at least if we are running 582 * a routing process they will come back. 583 */ 584 in_ifadown(&ia->ia_ifa, 1); 585 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 586 error = 0; 587 break; 588 589 default: 590 panic("in_control: unsupported ioctl"); 591 } 592 593 IF_ADDR_LOCK(ifp); 594 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 595 IF_ADDR_UNLOCK(ifp); 596 ifa_free(&ia->ia_ifa); /* if_addrhead */ 597 598 IN_IFADDR_WLOCK(); 599 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link); 600 if (ia->ia_addr.sin_family == AF_INET) { 601 struct in_ifaddr *if_ia; 602 603 LIST_REMOVE(ia, ia_hash); 604 IN_IFADDR_WUNLOCK(); 605 /* 606 * If this is the last IPv4 address configured on this 607 * interface, leave the all-hosts group. 608 * No state-change report need be transmitted. 609 */ 610 if_ia = NULL; 611 IFP_TO_IA(ifp, if_ia); 612 if (if_ia == NULL) { 613 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 614 IN_MULTI_LOCK(); 615 if (ii->ii_allhosts) { 616 (void)in_leavegroup_locked(ii->ii_allhosts, 617 NULL); 618 ii->ii_allhosts = NULL; 619 } 620 IN_MULTI_UNLOCK(); 621 } else 622 ifa_free(&if_ia->ia_ifa); 623 } else 624 IN_IFADDR_WUNLOCK(); 625 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 626 out: 627 if (ia != NULL) 628 ifa_free(&ia->ia_ifa); 629 return (error); 630 } 631 632 /* 633 * SIOC[GAD]LIFADDR. 634 * SIOCGLIFADDR: get first address. (?!?) 635 * SIOCGLIFADDR with IFLR_PREFIX: 636 * get first address that matches the specified prefix. 637 * SIOCALIFADDR: add the specified address. 638 * SIOCALIFADDR with IFLR_PREFIX: 639 * EINVAL since we can't deduce hostid part of the address. 640 * SIOCDLIFADDR: delete the specified address. 641 * SIOCDLIFADDR with IFLR_PREFIX: 642 * delete the first address that matches the specified prefix. 643 * return values: 644 * EINVAL on invalid parameters 645 * EADDRNOTAVAIL on prefix match failed/specified address not found 646 * other values may be returned from in_ioctl() 647 */ 648 static int 649 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 650 struct ifnet *ifp, struct thread *td) 651 { 652 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 653 struct ifaddr *ifa; 654 655 /* sanity checks */ 656 if (data == NULL || ifp == NULL) { 657 panic("invalid argument to in_lifaddr_ioctl"); 658 /*NOTRECHED*/ 659 } 660 661 switch (cmd) { 662 case SIOCGLIFADDR: 663 /* address must be specified on GET with IFLR_PREFIX */ 664 if ((iflr->flags & IFLR_PREFIX) == 0) 665 break; 666 /*FALLTHROUGH*/ 667 case SIOCALIFADDR: 668 case SIOCDLIFADDR: 669 /* address must be specified on ADD and DELETE */ 670 if (iflr->addr.ss_family != AF_INET) 671 return (EINVAL); 672 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 673 return (EINVAL); 674 /* XXX need improvement */ 675 if (iflr->dstaddr.ss_family 676 && iflr->dstaddr.ss_family != AF_INET) 677 return (EINVAL); 678 if (iflr->dstaddr.ss_family 679 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 680 return (EINVAL); 681 break; 682 default: /*shouldn't happen*/ 683 return (EOPNOTSUPP); 684 } 685 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 686 return (EINVAL); 687 688 switch (cmd) { 689 case SIOCALIFADDR: 690 { 691 struct in_aliasreq ifra; 692 693 if (iflr->flags & IFLR_PREFIX) 694 return (EINVAL); 695 696 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 697 bzero(&ifra, sizeof(ifra)); 698 bcopy(iflr->iflr_name, ifra.ifra_name, 699 sizeof(ifra.ifra_name)); 700 701 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 702 703 if (iflr->dstaddr.ss_family) { /*XXX*/ 704 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 705 iflr->dstaddr.ss_len); 706 } 707 708 ifra.ifra_mask.sin_family = AF_INET; 709 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 710 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 711 712 return (in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td)); 713 } 714 case SIOCGLIFADDR: 715 case SIOCDLIFADDR: 716 { 717 struct in_ifaddr *ia; 718 struct in_addr mask, candidate, match; 719 struct sockaddr_in *sin; 720 721 bzero(&mask, sizeof(mask)); 722 bzero(&match, sizeof(match)); 723 if (iflr->flags & IFLR_PREFIX) { 724 /* lookup a prefix rather than address. */ 725 in_len2mask(&mask, iflr->prefixlen); 726 727 sin = (struct sockaddr_in *)&iflr->addr; 728 match.s_addr = sin->sin_addr.s_addr; 729 match.s_addr &= mask.s_addr; 730 731 /* if you set extra bits, that's wrong */ 732 if (match.s_addr != sin->sin_addr.s_addr) 733 return (EINVAL); 734 735 } else { 736 /* on getting an address, take the 1st match */ 737 /* on deleting an address, do exact match */ 738 if (cmd != SIOCGLIFADDR) { 739 in_len2mask(&mask, 32); 740 sin = (struct sockaddr_in *)&iflr->addr; 741 match.s_addr = sin->sin_addr.s_addr; 742 } 743 } 744 745 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 746 if (ifa->ifa_addr->sa_family != AF_INET6) 747 continue; 748 if (match.s_addr == 0) 749 break; 750 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 751 candidate.s_addr &= mask.s_addr; 752 if (candidate.s_addr == match.s_addr) 753 break; 754 } 755 if (ifa == NULL) 756 return (EADDRNOTAVAIL); 757 ia = (struct in_ifaddr *)ifa; 758 759 if (cmd == SIOCGLIFADDR) { 760 /* fill in the if_laddrreq structure */ 761 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 762 763 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 764 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 765 ia->ia_dstaddr.sin_len); 766 } else 767 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 768 769 iflr->prefixlen = 770 in_mask2len(&ia->ia_sockmask.sin_addr); 771 772 iflr->flags = 0; /*XXX*/ 773 774 return (0); 775 } else { 776 struct in_aliasreq ifra; 777 778 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 779 bzero(&ifra, sizeof(ifra)); 780 bcopy(iflr->iflr_name, ifra.ifra_name, 781 sizeof(ifra.ifra_name)); 782 783 bcopy(&ia->ia_addr, &ifra.ifra_addr, 784 ia->ia_addr.sin_len); 785 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 786 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 787 ia->ia_dstaddr.sin_len); 788 } 789 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 790 ia->ia_sockmask.sin_len); 791 792 return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 793 ifp, td)); 794 } 795 } 796 } 797 798 return (EOPNOTSUPP); /*just for safety*/ 799 } 800 801 /* 802 * Delete any existing route for an interface. 803 */ 804 void 805 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia) 806 { 807 808 in_scrubprefix(ia); 809 } 810 811 /* 812 * Initialize an interface's internet address 813 * and routing table entry. 814 */ 815 static int 816 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, 817 int scrub) 818 { 819 register u_long i = ntohl(sin->sin_addr.s_addr); 820 struct sockaddr_in oldaddr; 821 struct rtentry *rt = NULL; 822 struct rt_addrinfo info; 823 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 824 int s = splimp(), flags = RTF_UP, error = 0; 825 826 oldaddr = ia->ia_addr; 827 if (oldaddr.sin_family == AF_INET) 828 LIST_REMOVE(ia, ia_hash); 829 ia->ia_addr = *sin; 830 if (ia->ia_addr.sin_family == AF_INET) { 831 IN_IFADDR_WLOCK(); 832 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 833 ia, ia_hash); 834 IN_IFADDR_WUNLOCK(); 835 } 836 /* 837 * Give the interface a chance to initialize 838 * if this is its first address, 839 * and to validate the address if necessary. 840 */ 841 if (ifp->if_ioctl != NULL) { 842 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 843 if (error) { 844 splx(s); 845 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 846 ia->ia_addr = oldaddr; 847 IN_IFADDR_WLOCK(); 848 if (ia->ia_addr.sin_family == AF_INET) 849 LIST_INSERT_HEAD(INADDR_HASH( 850 ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 851 else 852 /* 853 * If oldaddr family is not AF_INET (e.g. 854 * interface has been just created) in_control 855 * does not call LIST_REMOVE, and we end up 856 * with bogus ia entries in hash 857 */ 858 LIST_REMOVE(ia, ia_hash); 859 IN_IFADDR_WUNLOCK(); 860 return (error); 861 } 862 } 863 splx(s); 864 if (scrub) { 865 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 866 in_ifscrub(ifp, ia); 867 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 868 } 869 if (IN_CLASSA(i)) 870 ia->ia_netmask = IN_CLASSA_NET; 871 else if (IN_CLASSB(i)) 872 ia->ia_netmask = IN_CLASSB_NET; 873 else 874 ia->ia_netmask = IN_CLASSC_NET; 875 /* 876 * The subnet mask usually includes at least the standard network part, 877 * but may may be smaller in the case of supernetting. 878 * If it is set, we believe it. 879 */ 880 if (ia->ia_subnetmask == 0) { 881 ia->ia_subnetmask = ia->ia_netmask; 882 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 883 } else 884 ia->ia_netmask &= ia->ia_subnetmask; 885 ia->ia_net = i & ia->ia_netmask; 886 ia->ia_subnet = i & ia->ia_subnetmask; 887 in_socktrim(&ia->ia_sockmask); 888 #ifdef DEV_CARP 889 /* 890 * XXX: carp(4) does not have interface route 891 */ 892 if (ifp->if_type == IFT_CARP) 893 return (0); 894 #endif 895 /* 896 * Add route for the network. 897 */ 898 ia->ia_ifa.ifa_metric = ifp->if_metric; 899 if (ifp->if_flags & IFF_BROADCAST) { 900 ia->ia_broadaddr.sin_addr.s_addr = 901 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 902 ia->ia_netbroadcast.s_addr = 903 htonl(ia->ia_net | ~ ia->ia_netmask); 904 } else if (ifp->if_flags & IFF_LOOPBACK) { 905 ia->ia_dstaddr = ia->ia_addr; 906 flags |= RTF_HOST; 907 } else if (ifp->if_flags & IFF_POINTOPOINT) { 908 if (ia->ia_dstaddr.sin_family != AF_INET) 909 return (0); 910 flags |= RTF_HOST; 911 } 912 if ((error = in_addprefix(ia, flags)) != 0) 913 return (error); 914 915 if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY) 916 return (0); 917 918 /* 919 * add a loopback route to self 920 */ 921 if (V_useloopback && !(ifp->if_flags & IFF_LOOPBACK)) { 922 bzero(&info, sizeof(info)); 923 info.rti_ifp = V_loif; 924 info.rti_flags = ia->ia_flags | RTF_HOST | RTF_STATIC; 925 info.rti_info[RTAX_DST] = (struct sockaddr *)&ia->ia_addr; 926 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 927 error = rtrequest1_fib(RTM_ADD, &info, &rt, 0); 928 929 if (error == 0 && rt != NULL) { 930 RT_LOCK(rt); 931 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 932 rt->rt_ifp->if_type; 933 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 934 rt->rt_ifp->if_index; 935 RT_REMREF(rt); 936 RT_UNLOCK(rt); 937 } else if (error != 0) 938 log(LOG_INFO, "in_ifinit: insertion failed\n"); 939 } 940 941 return (error); 942 } 943 944 #define rtinitflags(x) \ 945 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 946 ? RTF_HOST : 0) 947 /* 948 * Check if we have a route for the given prefix already or add one accordingly. 949 */ 950 static int 951 in_addprefix(struct in_ifaddr *target, int flags) 952 { 953 struct in_ifaddr *ia; 954 struct in_addr prefix, mask, p, m; 955 int error; 956 957 if ((flags & RTF_HOST) != 0) { 958 prefix = target->ia_dstaddr.sin_addr; 959 mask.s_addr = 0; 960 } else { 961 prefix = target->ia_addr.sin_addr; 962 mask = target->ia_sockmask.sin_addr; 963 prefix.s_addr &= mask.s_addr; 964 } 965 966 IN_IFADDR_RLOCK(); 967 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 968 if (rtinitflags(ia)) { 969 p = ia->ia_addr.sin_addr; 970 971 if (prefix.s_addr != p.s_addr) 972 continue; 973 } else { 974 p = ia->ia_addr.sin_addr; 975 m = ia->ia_sockmask.sin_addr; 976 p.s_addr &= m.s_addr; 977 978 if (prefix.s_addr != p.s_addr || 979 mask.s_addr != m.s_addr) 980 continue; 981 } 982 983 /* 984 * If we got a matching prefix route inserted by other 985 * interface address, we are done here. 986 */ 987 if (ia->ia_flags & IFA_ROUTE) { 988 if (V_sameprefixcarponly && 989 target->ia_ifp->if_type != IFT_CARP && 990 ia->ia_ifp->if_type != IFT_CARP) { 991 IN_IFADDR_RUNLOCK(); 992 return (EEXIST); 993 } else { 994 IN_IFADDR_RUNLOCK(); 995 return (0); 996 } 997 } 998 } 999 IN_IFADDR_RUNLOCK(); 1000 1001 /* 1002 * No-one seem to have this prefix route, so we try to insert it. 1003 */ 1004 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 1005 if (!error) 1006 target->ia_flags |= IFA_ROUTE; 1007 return (error); 1008 } 1009 1010 extern void arp_ifscrub(struct ifnet *ifp, uint32_t addr); 1011 1012 /* 1013 * If there is no other address in the system that can serve a route to the 1014 * same prefix, remove the route. Hand over the route to the new address 1015 * otherwise. 1016 */ 1017 static int 1018 in_scrubprefix(struct in_ifaddr *target) 1019 { 1020 struct in_ifaddr *ia; 1021 struct in_addr prefix, mask, p; 1022 int error; 1023 struct sockaddr_in prefix0, mask0; 1024 struct rt_addrinfo info; 1025 struct sockaddr_dl null_sdl; 1026 1027 if ((target->ia_flags & IFA_ROUTE) == 0) 1028 return (0); 1029 1030 /* 1031 * Remove the loopback route to the interface address. 1032 * The "useloopback" setting is not consulted because if the 1033 * user configures an interface address, turns off this 1034 * setting, and then tries to delete that interface address, 1035 * checking the current setting of "useloopback" would leave 1036 * that interface address loopback route untouched, which 1037 * would be wrong. Therefore the interface address loopback route 1038 * deletion is unconditional. 1039 */ 1040 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) && 1041 !(target->ia_ifp->if_flags & IFF_LOOPBACK)) { 1042 bzero(&null_sdl, sizeof(null_sdl)); 1043 null_sdl.sdl_len = sizeof(null_sdl); 1044 null_sdl.sdl_family = AF_LINK; 1045 null_sdl.sdl_type = V_loif->if_type; 1046 null_sdl.sdl_index = V_loif->if_index; 1047 bzero(&info, sizeof(info)); 1048 info.rti_flags = target->ia_flags | RTF_HOST | RTF_STATIC; 1049 info.rti_info[RTAX_DST] = (struct sockaddr *)&target->ia_addr; 1050 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1051 error = rtrequest1_fib(RTM_DELETE, &info, NULL, 0); 1052 1053 if (error != 0) 1054 log(LOG_INFO, "in_scrubprefix: deletion failed\n"); 1055 } 1056 1057 if (rtinitflags(target)) 1058 prefix = target->ia_dstaddr.sin_addr; 1059 else { 1060 prefix = target->ia_addr.sin_addr; 1061 mask = target->ia_sockmask.sin_addr; 1062 prefix.s_addr &= mask.s_addr; 1063 /* remove arp cache */ 1064 arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr); 1065 } 1066 1067 IN_IFADDR_RLOCK(); 1068 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1069 if (rtinitflags(ia)) 1070 p = ia->ia_dstaddr.sin_addr; 1071 else { 1072 p = ia->ia_addr.sin_addr; 1073 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1074 } 1075 1076 if (prefix.s_addr != p.s_addr) 1077 continue; 1078 1079 /* 1080 * If we got a matching prefix address, move IFA_ROUTE and 1081 * the route itself to it. Make sure that routing daemons 1082 * get a heads-up. 1083 * 1084 * XXX: a special case for carp(4) interface 1085 */ 1086 if ((ia->ia_flags & IFA_ROUTE) == 0 1087 #ifdef DEV_CARP 1088 && (ia->ia_ifp->if_type != IFT_CARP) 1089 #endif 1090 ) { 1091 IN_IFADDR_RUNLOCK(); 1092 rtinit(&(target->ia_ifa), (int)RTM_DELETE, 1093 rtinitflags(target)); 1094 target->ia_flags &= ~IFA_ROUTE; 1095 1096 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 1097 rtinitflags(ia) | RTF_UP); 1098 if (error == 0) 1099 ia->ia_flags |= IFA_ROUTE; 1100 return (error); 1101 } 1102 } 1103 IN_IFADDR_RUNLOCK(); 1104 1105 /* 1106 * remove all L2 entries on the given prefix 1107 */ 1108 bzero(&prefix0, sizeof(prefix0)); 1109 prefix0.sin_len = sizeof(prefix0); 1110 prefix0.sin_family = AF_INET; 1111 prefix0.sin_addr.s_addr = target->ia_subnet; 1112 bzero(&mask0, sizeof(mask0)); 1113 mask0.sin_len = sizeof(mask0); 1114 mask0.sin_family = AF_INET; 1115 mask0.sin_addr.s_addr = target->ia_subnetmask; 1116 lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0, 1117 (struct sockaddr *)&mask0); 1118 1119 /* 1120 * As no-one seem to have this prefix, we can remove the route. 1121 */ 1122 rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 1123 target->ia_flags &= ~IFA_ROUTE; 1124 return (0); 1125 } 1126 1127 #undef rtinitflags 1128 1129 /* 1130 * Return 1 if the address might be a local broadcast address. 1131 */ 1132 int 1133 in_broadcast(struct in_addr in, struct ifnet *ifp) 1134 { 1135 register struct ifaddr *ifa; 1136 u_long t; 1137 1138 if (in.s_addr == INADDR_BROADCAST || 1139 in.s_addr == INADDR_ANY) 1140 return (1); 1141 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1142 return (0); 1143 t = ntohl(in.s_addr); 1144 /* 1145 * Look through the list of addresses for a match 1146 * with a broadcast address. 1147 */ 1148 #define ia ((struct in_ifaddr *)ifa) 1149 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1150 if (ifa->ifa_addr->sa_family == AF_INET && 1151 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1152 in.s_addr == ia->ia_netbroadcast.s_addr || 1153 /* 1154 * Check for old-style (host 0) broadcast. 1155 */ 1156 t == ia->ia_subnet || t == ia->ia_net) && 1157 /* 1158 * Check for an all one subnetmask. These 1159 * only exist when an interface gets a secondary 1160 * address. 1161 */ 1162 ia->ia_subnetmask != (u_long)0xffffffff) 1163 return (1); 1164 return (0); 1165 #undef ia 1166 } 1167 1168 /* 1169 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 1170 */ 1171 void 1172 in_ifdetach(struct ifnet *ifp) 1173 { 1174 1175 in_pcbpurgeif0(&V_ripcbinfo, ifp); 1176 in_pcbpurgeif0(&V_udbinfo, ifp); 1177 in_purgemaddrs(ifp); 1178 } 1179 1180 /* 1181 * Delete all IPv4 multicast address records, and associated link-layer 1182 * multicast address records, associated with ifp. 1183 * XXX It looks like domifdetach runs AFTER the link layer cleanup. 1184 * XXX This should not race with ifma_protospec being set during 1185 * a new allocation, if it does, we have bigger problems. 1186 */ 1187 static void 1188 in_purgemaddrs(struct ifnet *ifp) 1189 { 1190 LIST_HEAD(,in_multi) purgeinms; 1191 struct in_multi *inm, *tinm; 1192 struct ifmultiaddr *ifma; 1193 1194 LIST_INIT(&purgeinms); 1195 IN_MULTI_LOCK(); 1196 1197 /* 1198 * Extract list of in_multi associated with the detaching ifp 1199 * which the PF_INET layer is about to release. 1200 * We need to do this as IF_ADDR_LOCK() may be re-acquired 1201 * by code further down. 1202 */ 1203 IF_ADDR_LOCK(ifp); 1204 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1205 if (ifma->ifma_addr->sa_family != AF_INET || 1206 ifma->ifma_protospec == NULL) 1207 continue; 1208 #if 0 1209 KASSERT(ifma->ifma_protospec != NULL, 1210 ("%s: ifma_protospec is NULL", __func__)); 1211 #endif 1212 inm = (struct in_multi *)ifma->ifma_protospec; 1213 LIST_INSERT_HEAD(&purgeinms, inm, inm_link); 1214 } 1215 IF_ADDR_UNLOCK(ifp); 1216 1217 LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) { 1218 LIST_REMOVE(inm, inm_link); 1219 inm_release_locked(inm); 1220 } 1221 igmp_ifdetach(ifp); 1222 1223 IN_MULTI_UNLOCK(); 1224 } 1225 1226 #include <net/if_dl.h> 1227 #include <netinet/if_ether.h> 1228 1229 struct in_llentry { 1230 struct llentry base; 1231 struct sockaddr_in l3_addr4; 1232 }; 1233 1234 static struct llentry * 1235 in_lltable_new(const struct sockaddr *l3addr, u_int flags) 1236 { 1237 struct in_llentry *lle; 1238 1239 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_DONTWAIT | M_ZERO); 1240 if (lle == NULL) /* NB: caller generates msg */ 1241 return NULL; 1242 1243 callout_init(&lle->base.la_timer, CALLOUT_MPSAFE); 1244 /* 1245 * For IPv4 this will trigger "arpresolve" to generate 1246 * an ARP request. 1247 */ 1248 lle->base.la_expire = time_second; /* mark expired */ 1249 lle->l3_addr4 = *(const struct sockaddr_in *)l3addr; 1250 lle->base.lle_refcnt = 1; 1251 LLE_LOCK_INIT(&lle->base); 1252 return &lle->base; 1253 } 1254 1255 /* 1256 * Deletes an address from the address table. 1257 * This function is called by the timer functions 1258 * such as arptimer() and nd6_llinfo_timer(), and 1259 * the caller does the locking. 1260 */ 1261 static void 1262 in_lltable_free(struct lltable *llt, struct llentry *lle) 1263 { 1264 LLE_WUNLOCK(lle); 1265 LLE_LOCK_DESTROY(lle); 1266 free(lle, M_LLTABLE); 1267 } 1268 1269 1270 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 1271 (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 ) 1272 1273 static void 1274 in_lltable_prefix_free(struct lltable *llt, 1275 const struct sockaddr *prefix, 1276 const struct sockaddr *mask) 1277 { 1278 const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix; 1279 const struct sockaddr_in *msk = (const struct sockaddr_in *)mask; 1280 struct llentry *lle, *next; 1281 register int i; 1282 1283 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) { 1284 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 1285 1286 if (IN_ARE_MASKED_ADDR_EQUAL((struct sockaddr_in *)L3_ADDR(lle), 1287 pfx, msk)) { 1288 callout_drain(&lle->la_timer); 1289 LLE_WLOCK(lle); 1290 llentry_free(lle); 1291 } 1292 } 1293 } 1294 } 1295 1296 1297 static int 1298 in_lltable_rtcheck(struct ifnet *ifp, const struct sockaddr *l3addr) 1299 { 1300 struct rtentry *rt; 1301 1302 KASSERT(l3addr->sa_family == AF_INET, 1303 ("sin_family %d", l3addr->sa_family)); 1304 1305 /* XXX rtalloc1 should take a const param */ 1306 rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0); 1307 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 1308 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n", 1309 inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr)); 1310 if (rt != NULL) 1311 RTFREE_LOCKED(rt); 1312 return (EINVAL); 1313 } 1314 RTFREE_LOCKED(rt); 1315 return 0; 1316 } 1317 1318 /* 1319 * Return NULL if not found or marked for deletion. 1320 * If found return lle read locked. 1321 */ 1322 static struct llentry * 1323 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1324 { 1325 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1326 struct ifnet *ifp = llt->llt_ifp; 1327 struct llentry *lle; 1328 struct llentries *lleh; 1329 u_int hashkey; 1330 1331 IF_AFDATA_LOCK_ASSERT(ifp); 1332 KASSERT(l3addr->sa_family == AF_INET, 1333 ("sin_family %d", l3addr->sa_family)); 1334 1335 hashkey = sin->sin_addr.s_addr; 1336 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 1337 LIST_FOREACH(lle, lleh, lle_next) { 1338 struct sockaddr_in *sa2 = (struct sockaddr_in *)L3_ADDR(lle); 1339 if (lle->la_flags & LLE_DELETED) 1340 continue; 1341 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr) 1342 break; 1343 } 1344 if (lle == NULL) { 1345 #ifdef DIAGNOSTICS 1346 if (flags & LLE_DELETE) 1347 log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle); 1348 #endif 1349 if (!(flags & LLE_CREATE)) 1350 return (NULL); 1351 /* 1352 * A route that covers the given address must have 1353 * been installed 1st because we are doing a resolution, 1354 * verify this. 1355 */ 1356 if (!(flags & LLE_IFADDR) && 1357 in_lltable_rtcheck(ifp, l3addr) != 0) 1358 goto done; 1359 1360 lle = in_lltable_new(l3addr, flags); 1361 if (lle == NULL) { 1362 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 1363 goto done; 1364 } 1365 lle->la_flags = flags & ~LLE_CREATE; 1366 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 1367 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 1368 lle->la_flags |= (LLE_VALID | LLE_STATIC); 1369 } 1370 1371 lle->lle_tbl = llt; 1372 lle->lle_head = lleh; 1373 LIST_INSERT_HEAD(lleh, lle, lle_next); 1374 } else if (flags & LLE_DELETE) { 1375 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 1376 LLE_WLOCK(lle); 1377 lle->la_flags = LLE_DELETED; 1378 LLE_WUNLOCK(lle); 1379 #ifdef DIAGNOSTICS 1380 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 1381 #endif 1382 } 1383 lle = (void *)-1; 1384 1385 } 1386 if (LLE_IS_VALID(lle)) { 1387 if (flags & LLE_EXCLUSIVE) 1388 LLE_WLOCK(lle); 1389 else 1390 LLE_RLOCK(lle); 1391 } 1392 done: 1393 return (lle); 1394 } 1395 1396 static int 1397 in_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 1398 { 1399 #define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle)) 1400 struct ifnet *ifp = llt->llt_ifp; 1401 struct llentry *lle; 1402 /* XXX stack use */ 1403 struct { 1404 struct rt_msghdr rtm; 1405 struct sockaddr_inarp sin; 1406 struct sockaddr_dl sdl; 1407 } arpc; 1408 int error, i; 1409 1410 /* XXXXX 1411 * current IFNET_RLOCK() is mapped to IFNET_WLOCK() 1412 * so it is okay to use this ASSERT, change it when 1413 * IFNET lock is finalized 1414 */ 1415 IFNET_WLOCK_ASSERT(); 1416 1417 error = 0; 1418 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1419 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 1420 struct sockaddr_dl *sdl; 1421 1422 /* skip deleted entries */ 1423 if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID) 1424 continue; 1425 /* Skip if jailed and not a valid IP of the prison. */ 1426 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 1427 continue; 1428 /* 1429 * produce a msg made of: 1430 * struct rt_msghdr; 1431 * struct sockaddr_inarp; (IPv4) 1432 * struct sockaddr_dl; 1433 */ 1434 bzero(&arpc, sizeof(arpc)); 1435 arpc.rtm.rtm_msglen = sizeof(arpc); 1436 arpc.rtm.rtm_version = RTM_VERSION; 1437 arpc.rtm.rtm_type = RTM_GET; 1438 arpc.rtm.rtm_flags = RTF_UP; 1439 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1440 arpc.sin.sin_family = AF_INET; 1441 arpc.sin.sin_len = sizeof(arpc.sin); 1442 arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr; 1443 1444 /* publish */ 1445 if (lle->la_flags & LLE_PUB) { 1446 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1447 /* proxy only */ 1448 if (lle->la_flags & LLE_PROXY) 1449 arpc.sin.sin_other = SIN_PROXY; 1450 } 1451 1452 sdl = &arpc.sdl; 1453 sdl->sdl_family = AF_LINK; 1454 sdl->sdl_len = sizeof(*sdl); 1455 sdl->sdl_alen = ifp->if_addrlen; 1456 sdl->sdl_index = ifp->if_index; 1457 sdl->sdl_type = ifp->if_type; 1458 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1459 1460 arpc.rtm.rtm_rmx.rmx_expire = 1461 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1462 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1463 if (lle->la_flags & LLE_STATIC) 1464 arpc.rtm.rtm_flags |= RTF_STATIC; 1465 arpc.rtm.rtm_index = ifp->if_index; 1466 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1467 if (error) 1468 break; 1469 } 1470 } 1471 return error; 1472 #undef SIN 1473 } 1474 1475 void * 1476 in_domifattach(struct ifnet *ifp) 1477 { 1478 struct in_ifinfo *ii; 1479 struct lltable *llt; 1480 1481 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); 1482 1483 llt = lltable_init(ifp, AF_INET); 1484 if (llt != NULL) { 1485 llt->llt_new = in_lltable_new; 1486 llt->llt_free = in_lltable_free; 1487 llt->llt_prefix_free = in_lltable_prefix_free; 1488 llt->llt_rtcheck = in_lltable_rtcheck; 1489 llt->llt_lookup = in_lltable_lookup; 1490 llt->llt_dump = in_lltable_dump; 1491 } 1492 ii->ii_llt = llt; 1493 1494 ii->ii_igmp = igmp_domifattach(ifp); 1495 1496 return ii; 1497 } 1498 1499 void 1500 in_domifdetach(struct ifnet *ifp, void *aux) 1501 { 1502 struct in_ifinfo *ii = (struct in_ifinfo *)aux; 1503 1504 igmp_domifdetach(ifp); 1505 lltable_free(ii->ii_llt); 1506 free(ii, M_IFADDR); 1507 } 1508