Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netinet/in.c
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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: releng/9.0/sys/netinet/in.c 227002 2011-11-01 18:29:06Z qingli $"); 35 36 #include "opt_mpath.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_arp.h> 53 #include <net/if_dl.h> 54 #include <net/if_llatbl.h> 55 #include <net/if_types.h> 56 #include <net/route.h> 57 #include <net/vnet.h> 58 59 #include <netinet/in.h> 60 #include <netinet/in_var.h> 61 #include <netinet/in_pcb.h> 62 #include <netinet/ip_var.h> 63 #include <netinet/igmp_var.h> 64 #include <netinet/udp.h> 65 #include <netinet/udp_var.h> 66 67 static int in_mask2len(struct in_addr *); 68 static void in_len2mask(struct in_addr *, int); 69 static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, 70 struct ifnet *, struct thread *); 71 72 static int in_addprefix(struct in_ifaddr *, int); 73 static int in_scrubprefix(struct in_ifaddr *, u_int); 74 static void in_socktrim(struct sockaddr_in *); 75 static int in_ifinit(struct ifnet *, 76 struct in_ifaddr *, struct sockaddr_in *, int); 77 static void in_purgemaddrs(struct ifnet *); 78 79 static VNET_DEFINE(int, sameprefixcarponly); 80 #define V_sameprefixcarponly VNET(sameprefixcarponly) 81 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, same_prefix_carp_only, CTLFLAG_RW, 82 &VNET_NAME(sameprefixcarponly), 0, 83 "Refuse to create same prefixes on different interfaces"); 84 85 VNET_DECLARE(struct inpcbinfo, ripcbinfo); 86 #define V_ripcbinfo VNET(ripcbinfo) 87 88 VNET_DECLARE(struct arpstat, arpstat); /* ARP statistics, see if_arp.h */ 89 #define V_arpstat VNET(arpstat) 90 91 /* 92 * Return 1 if an internet address is for a ``local'' host 93 * (one to which we have a connection). 94 */ 95 int 96 in_localaddr(struct in_addr in) 97 { 98 register u_long i = ntohl(in.s_addr); 99 register struct in_ifaddr *ia; 100 101 IN_IFADDR_RLOCK(); 102 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 103 if ((i & ia->ia_subnetmask) == ia->ia_subnet) { 104 IN_IFADDR_RUNLOCK(); 105 return (1); 106 } 107 } 108 IN_IFADDR_RUNLOCK(); 109 return (0); 110 } 111 112 /* 113 * Return 1 if an internet address is for the local host and configured 114 * on one of its interfaces. 115 */ 116 int 117 in_localip(struct in_addr in) 118 { 119 struct in_ifaddr *ia; 120 121 IN_IFADDR_RLOCK(); 122 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { 123 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) { 124 IN_IFADDR_RUNLOCK(); 125 return (1); 126 } 127 } 128 IN_IFADDR_RUNLOCK(); 129 return (0); 130 } 131 132 /* 133 * Determine whether an IP address is in a reserved set of addresses 134 * that may not be forwarded, or whether datagrams to that destination 135 * may be forwarded. 136 */ 137 int 138 in_canforward(struct in_addr in) 139 { 140 register u_long i = ntohl(in.s_addr); 141 register u_long net; 142 143 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i)) 144 return (0); 145 if (IN_CLASSA(i)) { 146 net = i & IN_CLASSA_NET; 147 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 148 return (0); 149 } 150 return (1); 151 } 152 153 /* 154 * Trim a mask in a sockaddr 155 */ 156 static void 157 in_socktrim(struct sockaddr_in *ap) 158 { 159 register char *cplim = (char *) &ap->sin_addr; 160 register char *cp = (char *) (&ap->sin_addr + 1); 161 162 ap->sin_len = 0; 163 while (--cp >= cplim) 164 if (*cp) { 165 (ap)->sin_len = cp - (char *) (ap) + 1; 166 break; 167 } 168 } 169 170 static int 171 in_mask2len(mask) 172 struct in_addr *mask; 173 { 174 int x, y; 175 u_char *p; 176 177 p = (u_char *)mask; 178 for (x = 0; x < sizeof(*mask); x++) { 179 if (p[x] != 0xff) 180 break; 181 } 182 y = 0; 183 if (x < sizeof(*mask)) { 184 for (y = 0; y < 8; y++) { 185 if ((p[x] & (0x80 >> y)) == 0) 186 break; 187 } 188 } 189 return (x * 8 + y); 190 } 191 192 static void 193 in_len2mask(struct in_addr *mask, int len) 194 { 195 int i; 196 u_char *p; 197 198 p = (u_char *)mask; 199 bzero(mask, sizeof(*mask)); 200 for (i = 0; i < len / 8; i++) 201 p[i] = 0xff; 202 if (len % 8) 203 p[i] = (0xff00 >> (len % 8)) & 0xff; 204 } 205 206 /* 207 * Generic internet control operations (ioctl's). 208 * 209 * ifp is NULL if not an interface-specific ioctl. 210 */ 211 /* ARGSUSED */ 212 int 213 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 214 struct thread *td) 215 { 216 register struct ifreq *ifr = (struct ifreq *)data; 217 register struct in_ifaddr *ia, *iap; 218 register struct ifaddr *ifa; 219 struct in_addr allhosts_addr; 220 struct in_addr dst; 221 struct in_ifinfo *ii; 222 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 223 struct sockaddr_in oldaddr; 224 int error, hostIsNew, iaIsNew, maskIsNew; 225 int iaIsFirst; 226 227 ia = NULL; 228 iaIsFirst = 0; 229 iaIsNew = 0; 230 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 231 232 /* 233 * Filter out ioctls we implement directly; forward the rest on to 234 * in_lifaddr_ioctl() and ifp->if_ioctl(). 235 */ 236 switch (cmd) { 237 case SIOCAIFADDR: 238 case SIOCDIFADDR: 239 case SIOCGIFADDR: 240 case SIOCGIFBRDADDR: 241 case SIOCGIFDSTADDR: 242 case SIOCGIFNETMASK: 243 case SIOCSIFADDR: 244 case SIOCSIFBRDADDR: 245 case SIOCSIFDSTADDR: 246 case SIOCSIFNETMASK: 247 break; 248 249 case SIOCALIFADDR: 250 if (td != NULL) { 251 error = priv_check(td, PRIV_NET_ADDIFADDR); 252 if (error) 253 return (error); 254 } 255 if (ifp == NULL) 256 return (EINVAL); 257 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 258 259 case SIOCDLIFADDR: 260 if (td != NULL) { 261 error = priv_check(td, PRIV_NET_DELIFADDR); 262 if (error) 263 return (error); 264 } 265 if (ifp == NULL) 266 return (EINVAL); 267 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 268 269 case SIOCGLIFADDR: 270 if (ifp == NULL) 271 return (EINVAL); 272 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 273 274 default: 275 if (ifp == NULL || ifp->if_ioctl == NULL) 276 return (EOPNOTSUPP); 277 return ((*ifp->if_ioctl)(ifp, cmd, data)); 278 } 279 280 if (ifp == NULL) 281 return (EADDRNOTAVAIL); 282 283 /* 284 * Security checks before we get involved in any work. 285 */ 286 switch (cmd) { 287 case SIOCAIFADDR: 288 case SIOCSIFADDR: 289 case SIOCSIFBRDADDR: 290 case SIOCSIFNETMASK: 291 case SIOCSIFDSTADDR: 292 if (td != NULL) { 293 error = priv_check(td, PRIV_NET_ADDIFADDR); 294 if (error) 295 return (error); 296 } 297 break; 298 299 case SIOCDIFADDR: 300 if (td != NULL) { 301 error = priv_check(td, PRIV_NET_DELIFADDR); 302 if (error) 303 return (error); 304 } 305 break; 306 } 307 308 /* 309 * Find address for this interface, if it exists. 310 * 311 * If an alias address was specified, find that one instead of the 312 * first one on the interface, if possible. 313 */ 314 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 315 IN_IFADDR_RLOCK(); 316 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) { 317 if (iap->ia_ifp == ifp && 318 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 319 if (td == NULL || prison_check_ip4(td->td_ucred, 320 &dst) == 0) 321 ia = iap; 322 break; 323 } 324 } 325 if (ia != NULL) 326 ifa_ref(&ia->ia_ifa); 327 IN_IFADDR_RUNLOCK(); 328 if (ia == NULL) { 329 IF_ADDR_LOCK(ifp); 330 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 331 iap = ifatoia(ifa); 332 if (iap->ia_addr.sin_family == AF_INET) { 333 if (td != NULL && 334 prison_check_ip4(td->td_ucred, 335 &iap->ia_addr.sin_addr) != 0) 336 continue; 337 ia = iap; 338 break; 339 } 340 } 341 if (ia != NULL) 342 ifa_ref(&ia->ia_ifa); 343 IF_ADDR_UNLOCK(ifp); 344 } 345 if (ia == NULL) 346 iaIsFirst = 1; 347 348 error = 0; 349 switch (cmd) { 350 case SIOCAIFADDR: 351 case SIOCDIFADDR: 352 if (ifra->ifra_addr.sin_family == AF_INET) { 353 struct in_ifaddr *oia; 354 355 IN_IFADDR_RLOCK(); 356 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 357 if (ia->ia_ifp == ifp && 358 ia->ia_addr.sin_addr.s_addr == 359 ifra->ifra_addr.sin_addr.s_addr) 360 break; 361 } 362 if (ia != NULL && ia != oia) 363 ifa_ref(&ia->ia_ifa); 364 if (oia != NULL && ia != oia) 365 ifa_free(&oia->ia_ifa); 366 IN_IFADDR_RUNLOCK(); 367 if ((ifp->if_flags & IFF_POINTOPOINT) 368 && (cmd == SIOCAIFADDR) 369 && (ifra->ifra_dstaddr.sin_addr.s_addr 370 == INADDR_ANY)) { 371 error = EDESTADDRREQ; 372 goto out; 373 } 374 } 375 if (cmd == SIOCDIFADDR && ia == NULL) { 376 error = EADDRNOTAVAIL; 377 goto out; 378 } 379 /* FALLTHROUGH */ 380 case SIOCSIFADDR: 381 case SIOCSIFNETMASK: 382 case SIOCSIFDSTADDR: 383 if (ia == NULL) { 384 ia = (struct in_ifaddr *) 385 malloc(sizeof *ia, M_IFADDR, M_NOWAIT | 386 M_ZERO); 387 if (ia == NULL) { 388 error = ENOBUFS; 389 goto out; 390 } 391 392 ifa = &ia->ia_ifa; 393 ifa_init(ifa); 394 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 395 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 396 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 397 398 ia->ia_sockmask.sin_len = 8; 399 ia->ia_sockmask.sin_family = AF_INET; 400 if (ifp->if_flags & IFF_BROADCAST) { 401 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 402 ia->ia_broadaddr.sin_family = AF_INET; 403 } 404 ia->ia_ifp = ifp; 405 406 ifa_ref(ifa); /* if_addrhead */ 407 IF_ADDR_LOCK(ifp); 408 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 409 IF_ADDR_UNLOCK(ifp); 410 ifa_ref(ifa); /* in_ifaddrhead */ 411 IN_IFADDR_WLOCK(); 412 TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link); 413 IN_IFADDR_WUNLOCK(); 414 iaIsNew = 1; 415 } 416 break; 417 418 case SIOCSIFBRDADDR: 419 case SIOCGIFADDR: 420 case SIOCGIFNETMASK: 421 case SIOCGIFDSTADDR: 422 case SIOCGIFBRDADDR: 423 if (ia == NULL) { 424 error = EADDRNOTAVAIL; 425 goto out; 426 } 427 break; 428 } 429 430 /* 431 * Most paths in this switch return directly or via out. Only paths 432 * that remove the address break in order to hit common removal code. 433 */ 434 switch (cmd) { 435 case SIOCGIFADDR: 436 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 437 goto out; 438 439 case SIOCGIFBRDADDR: 440 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 441 error = EINVAL; 442 goto out; 443 } 444 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 445 goto out; 446 447 case SIOCGIFDSTADDR: 448 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 449 error = EINVAL; 450 goto out; 451 } 452 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 453 goto out; 454 455 case SIOCGIFNETMASK: 456 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 457 goto out; 458 459 case SIOCSIFDSTADDR: 460 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 461 error = EINVAL; 462 goto out; 463 } 464 oldaddr = ia->ia_dstaddr; 465 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 466 if (ifp->if_ioctl != NULL) { 467 error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, 468 (caddr_t)ia); 469 if (error) { 470 ia->ia_dstaddr = oldaddr; 471 goto out; 472 } 473 } 474 if (ia->ia_flags & IFA_ROUTE) { 475 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 476 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 477 ia->ia_ifa.ifa_dstaddr = 478 (struct sockaddr *)&ia->ia_dstaddr; 479 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 480 } 481 goto out; 482 483 case SIOCSIFBRDADDR: 484 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 485 error = EINVAL; 486 goto out; 487 } 488 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 489 goto out; 490 491 case SIOCSIFADDR: 492 error = in_ifinit(ifp, ia, 493 (struct sockaddr_in *) &ifr->ifr_addr, 1); 494 if (error != 0 && iaIsNew) 495 break; 496 if (error == 0) { 497 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 498 if (iaIsFirst && 499 (ifp->if_flags & IFF_MULTICAST) != 0) { 500 error = in_joingroup(ifp, &allhosts_addr, 501 NULL, &ii->ii_allhosts); 502 } 503 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 504 } 505 error = 0; 506 goto out; 507 508 case SIOCSIFNETMASK: 509 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 510 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 511 goto out; 512 513 case SIOCAIFADDR: 514 maskIsNew = 0; 515 hostIsNew = 1; 516 error = 0; 517 if (ia->ia_addr.sin_family == AF_INET) { 518 if (ifra->ifra_addr.sin_len == 0) { 519 ifra->ifra_addr = ia->ia_addr; 520 hostIsNew = 0; 521 } else if (ifra->ifra_addr.sin_addr.s_addr == 522 ia->ia_addr.sin_addr.s_addr) 523 hostIsNew = 0; 524 } 525 if (ifra->ifra_mask.sin_len) { 526 /* 527 * QL: XXX 528 * Need to scrub the prefix here in case 529 * the issued command is SIOCAIFADDR with 530 * the same address, but with a different 531 * prefix length. And if the prefix length 532 * is the same as before, then the call is 533 * un-necessarily executed here. 534 */ 535 in_ifscrub(ifp, ia, LLE_STATIC); 536 ia->ia_sockmask = ifra->ifra_mask; 537 ia->ia_sockmask.sin_family = AF_INET; 538 ia->ia_subnetmask = 539 ntohl(ia->ia_sockmask.sin_addr.s_addr); 540 maskIsNew = 1; 541 } 542 if ((ifp->if_flags & IFF_POINTOPOINT) && 543 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 544 in_ifscrub(ifp, ia, LLE_STATIC); 545 ia->ia_dstaddr = ifra->ifra_dstaddr; 546 maskIsNew = 1; /* We lie; but the effect's the same */ 547 } 548 if (ifra->ifra_addr.sin_family == AF_INET && 549 (hostIsNew || maskIsNew)) 550 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 551 if (error != 0 && iaIsNew) 552 break; 553 554 if ((ifp->if_flags & IFF_BROADCAST) && 555 (ifra->ifra_broadaddr.sin_family == AF_INET)) 556 ia->ia_broadaddr = ifra->ifra_broadaddr; 557 if (error == 0) { 558 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 559 if (iaIsFirst && 560 (ifp->if_flags & IFF_MULTICAST) != 0) { 561 error = in_joingroup(ifp, &allhosts_addr, 562 NULL, &ii->ii_allhosts); 563 } 564 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 565 } 566 goto out; 567 568 case SIOCDIFADDR: 569 /* 570 * in_ifscrub kills the interface route. 571 */ 572 in_ifscrub(ifp, ia, LLE_STATIC); 573 574 /* 575 * in_ifadown gets rid of all the rest of 576 * the routes. This is not quite the right 577 * thing to do, but at least if we are running 578 * a routing process they will come back. 579 */ 580 in_ifadown(&ia->ia_ifa, 1); 581 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 582 error = 0; 583 break; 584 585 default: 586 panic("in_control: unsupported ioctl"); 587 } 588 589 IF_ADDR_LOCK(ifp); 590 /* Re-check that ia is still part of the list. */ 591 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 592 if (ifa == &ia->ia_ifa) 593 break; 594 } 595 if (ifa == NULL) { 596 /* 597 * If we lost the race with another thread, there is no need to 598 * try it again for the next loop as there is no other exit 599 * path between here and out. 600 */ 601 IF_ADDR_UNLOCK(ifp); 602 error = EADDRNOTAVAIL; 603 goto out; 604 } 605 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 606 IF_ADDR_UNLOCK(ifp); 607 ifa_free(&ia->ia_ifa); /* if_addrhead */ 608 609 IN_IFADDR_WLOCK(); 610 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link); 611 if (ia->ia_addr.sin_family == AF_INET) { 612 struct in_ifaddr *if_ia; 613 614 LIST_REMOVE(ia, ia_hash); 615 IN_IFADDR_WUNLOCK(); 616 /* 617 * If this is the last IPv4 address configured on this 618 * interface, leave the all-hosts group. 619 * No state-change report need be transmitted. 620 */ 621 if_ia = NULL; 622 IFP_TO_IA(ifp, if_ia); 623 if (if_ia == NULL) { 624 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 625 IN_MULTI_LOCK(); 626 if (ii->ii_allhosts) { 627 (void)in_leavegroup_locked(ii->ii_allhosts, 628 NULL); 629 ii->ii_allhosts = NULL; 630 } 631 IN_MULTI_UNLOCK(); 632 } else 633 ifa_free(&if_ia->ia_ifa); 634 } else 635 IN_IFADDR_WUNLOCK(); 636 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 637 out: 638 if (ia != NULL) 639 ifa_free(&ia->ia_ifa); 640 return (error); 641 } 642 643 /* 644 * SIOC[GAD]LIFADDR. 645 * SIOCGLIFADDR: get first address. (?!?) 646 * SIOCGLIFADDR with IFLR_PREFIX: 647 * get first address that matches the specified prefix. 648 * SIOCALIFADDR: add the specified address. 649 * SIOCALIFADDR with IFLR_PREFIX: 650 * EINVAL since we can't deduce hostid part of the address. 651 * SIOCDLIFADDR: delete the specified address. 652 * SIOCDLIFADDR with IFLR_PREFIX: 653 * delete the first address that matches the specified prefix. 654 * return values: 655 * EINVAL on invalid parameters 656 * EADDRNOTAVAIL on prefix match failed/specified address not found 657 * other values may be returned from in_ioctl() 658 */ 659 static int 660 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 661 struct ifnet *ifp, struct thread *td) 662 { 663 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 664 struct ifaddr *ifa; 665 666 /* sanity checks */ 667 if (data == NULL || ifp == NULL) { 668 panic("invalid argument to in_lifaddr_ioctl"); 669 /*NOTRECHED*/ 670 } 671 672 switch (cmd) { 673 case SIOCGLIFADDR: 674 /* address must be specified on GET with IFLR_PREFIX */ 675 if ((iflr->flags & IFLR_PREFIX) == 0) 676 break; 677 /*FALLTHROUGH*/ 678 case SIOCALIFADDR: 679 case SIOCDLIFADDR: 680 /* address must be specified on ADD and DELETE */ 681 if (iflr->addr.ss_family != AF_INET) 682 return (EINVAL); 683 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 684 return (EINVAL); 685 /* XXX need improvement */ 686 if (iflr->dstaddr.ss_family 687 && iflr->dstaddr.ss_family != AF_INET) 688 return (EINVAL); 689 if (iflr->dstaddr.ss_family 690 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 691 return (EINVAL); 692 break; 693 default: /*shouldn't happen*/ 694 return (EOPNOTSUPP); 695 } 696 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 697 return (EINVAL); 698 699 switch (cmd) { 700 case SIOCALIFADDR: 701 { 702 struct in_aliasreq ifra; 703 704 if (iflr->flags & IFLR_PREFIX) 705 return (EINVAL); 706 707 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 708 bzero(&ifra, sizeof(ifra)); 709 bcopy(iflr->iflr_name, ifra.ifra_name, 710 sizeof(ifra.ifra_name)); 711 712 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 713 714 if (iflr->dstaddr.ss_family) { /*XXX*/ 715 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 716 iflr->dstaddr.ss_len); 717 } 718 719 ifra.ifra_mask.sin_family = AF_INET; 720 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 721 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 722 723 return (in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td)); 724 } 725 case SIOCGLIFADDR: 726 case SIOCDLIFADDR: 727 { 728 struct in_ifaddr *ia; 729 struct in_addr mask, candidate, match; 730 struct sockaddr_in *sin; 731 732 bzero(&mask, sizeof(mask)); 733 bzero(&match, sizeof(match)); 734 if (iflr->flags & IFLR_PREFIX) { 735 /* lookup a prefix rather than address. */ 736 in_len2mask(&mask, iflr->prefixlen); 737 738 sin = (struct sockaddr_in *)&iflr->addr; 739 match.s_addr = sin->sin_addr.s_addr; 740 match.s_addr &= mask.s_addr; 741 742 /* if you set extra bits, that's wrong */ 743 if (match.s_addr != sin->sin_addr.s_addr) 744 return (EINVAL); 745 746 } else { 747 /* on getting an address, take the 1st match */ 748 /* on deleting an address, do exact match */ 749 if (cmd != SIOCGLIFADDR) { 750 in_len2mask(&mask, 32); 751 sin = (struct sockaddr_in *)&iflr->addr; 752 match.s_addr = sin->sin_addr.s_addr; 753 } 754 } 755 756 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 757 if (ifa->ifa_addr->sa_family != AF_INET6) 758 continue; 759 if (match.s_addr == 0) 760 break; 761 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 762 candidate.s_addr &= mask.s_addr; 763 if (candidate.s_addr == match.s_addr) 764 break; 765 } 766 if (ifa == NULL) 767 return (EADDRNOTAVAIL); 768 ia = (struct in_ifaddr *)ifa; 769 770 if (cmd == SIOCGLIFADDR) { 771 /* fill in the if_laddrreq structure */ 772 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 773 774 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 775 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 776 ia->ia_dstaddr.sin_len); 777 } else 778 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 779 780 iflr->prefixlen = 781 in_mask2len(&ia->ia_sockmask.sin_addr); 782 783 iflr->flags = 0; /*XXX*/ 784 785 return (0); 786 } else { 787 struct in_aliasreq ifra; 788 789 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 790 bzero(&ifra, sizeof(ifra)); 791 bcopy(iflr->iflr_name, ifra.ifra_name, 792 sizeof(ifra.ifra_name)); 793 794 bcopy(&ia->ia_addr, &ifra.ifra_addr, 795 ia->ia_addr.sin_len); 796 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 797 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 798 ia->ia_dstaddr.sin_len); 799 } 800 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 801 ia->ia_sockmask.sin_len); 802 803 return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 804 ifp, td)); 805 } 806 } 807 } 808 809 return (EOPNOTSUPP); /*just for safety*/ 810 } 811 812 /* 813 * Delete any existing route for an interface. 814 */ 815 void 816 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia, u_int flags) 817 { 818 819 in_scrubprefix(ia, flags); 820 } 821 822 /* 823 * Initialize an interface's internet address 824 * and routing table entry. 825 */ 826 static int 827 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, 828 int scrub) 829 { 830 register u_long i = ntohl(sin->sin_addr.s_addr); 831 struct sockaddr_in oldaddr; 832 int s = splimp(), flags = RTF_UP, error = 0; 833 834 oldaddr = ia->ia_addr; 835 if (oldaddr.sin_family == AF_INET) 836 LIST_REMOVE(ia, ia_hash); 837 ia->ia_addr = *sin; 838 if (ia->ia_addr.sin_family == AF_INET) { 839 IN_IFADDR_WLOCK(); 840 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 841 ia, ia_hash); 842 IN_IFADDR_WUNLOCK(); 843 } 844 /* 845 * Give the interface a chance to initialize 846 * if this is its first address, 847 * and to validate the address if necessary. 848 */ 849 if (ifp->if_ioctl != NULL) { 850 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 851 if (error) { 852 splx(s); 853 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 854 ia->ia_addr = oldaddr; 855 IN_IFADDR_WLOCK(); 856 if (ia->ia_addr.sin_family == AF_INET) 857 LIST_INSERT_HEAD(INADDR_HASH( 858 ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 859 else 860 /* 861 * If oldaddr family is not AF_INET (e.g. 862 * interface has been just created) in_control 863 * does not call LIST_REMOVE, and we end up 864 * with bogus ia entries in hash 865 */ 866 LIST_REMOVE(ia, ia_hash); 867 IN_IFADDR_WUNLOCK(); 868 return (error); 869 } 870 } 871 splx(s); 872 if (scrub) { 873 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 874 in_ifscrub(ifp, ia, LLE_STATIC); 875 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 876 } 877 /* 878 * Be compatible with network classes, if netmask isn't supplied, 879 * guess it based on classes. 880 */ 881 if (ia->ia_subnetmask == 0) { 882 if (IN_CLASSA(i)) 883 ia->ia_subnetmask = IN_CLASSA_NET; 884 else if (IN_CLASSB(i)) 885 ia->ia_subnetmask = IN_CLASSB_NET; 886 else 887 ia->ia_subnetmask = IN_CLASSC_NET; 888 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 889 } 890 ia->ia_subnet = i & ia->ia_subnetmask; 891 in_socktrim(&ia->ia_sockmask); 892 /* 893 * XXX: carp(4) does not have interface route 894 */ 895 if (ifp->if_type == IFT_CARP) 896 return (0); 897 /* 898 * Add route for the network. 899 */ 900 ia->ia_ifa.ifa_metric = ifp->if_metric; 901 if (ifp->if_flags & IFF_BROADCAST) { 902 if (ia->ia_subnetmask == IN_RFC3021_MASK) 903 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST; 904 else 905 ia->ia_broadaddr.sin_addr.s_addr = 906 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 907 } else if (ifp->if_flags & IFF_LOOPBACK) { 908 ia->ia_dstaddr = ia->ia_addr; 909 flags |= RTF_HOST; 910 } else if (ifp->if_flags & IFF_POINTOPOINT) { 911 if (ia->ia_dstaddr.sin_family != AF_INET) 912 return (0); 913 flags |= RTF_HOST; 914 } 915 if ((error = in_addprefix(ia, flags)) != 0) 916 return (error); 917 918 if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY) 919 return (0); 920 921 if (ifp->if_flags & IFF_POINTOPOINT) { 922 if (ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 923 return (0); 924 } 925 926 927 /* 928 * add a loopback route to self 929 */ 930 if (V_useloopback && !(ifp->if_flags & IFF_LOOPBACK)) { 931 struct route ia_ro; 932 933 bzero(&ia_ro, sizeof(ia_ro)); 934 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = ia->ia_addr; 935 rtalloc_ign_fib(&ia_ro, 0, 0); 936 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) && 937 (ia_ro.ro_rt->rt_ifp == V_loif)) { 938 RT_LOCK(ia_ro.ro_rt); 939 RT_ADDREF(ia_ro.ro_rt); 940 RTFREE_LOCKED(ia_ro.ro_rt); 941 } else 942 error = ifa_add_loopback_route((struct ifaddr *)ia, 943 (struct sockaddr *)&ia->ia_addr); 944 if (error == 0) 945 ia->ia_flags |= IFA_RTSELF; 946 if (ia_ro.ro_rt != NULL) 947 RTFREE(ia_ro.ro_rt); 948 } 949 950 return (error); 951 } 952 953 #define rtinitflags(x) \ 954 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 955 ? RTF_HOST : 0) 956 957 /* 958 * Generate a routing message when inserting or deleting 959 * an interface address alias. 960 */ 961 static void in_addralias_rtmsg(int cmd, struct in_addr *prefix, 962 struct in_ifaddr *target) 963 { 964 struct route pfx_ro; 965 struct sockaddr_in *pfx_addr; 966 struct rtentry msg_rt; 967 968 /* QL: XXX 969 * This is a bit questionable because there is no 970 * additional route entry added/deleted for an address 971 * alias. Therefore this route report is inaccurate. 972 */ 973 bzero(&pfx_ro, sizeof(pfx_ro)); 974 pfx_addr = (struct sockaddr_in *)(&pfx_ro.ro_dst); 975 pfx_addr->sin_len = sizeof(*pfx_addr); 976 pfx_addr->sin_family = AF_INET; 977 pfx_addr->sin_addr = *prefix; 978 rtalloc_ign_fib(&pfx_ro, 0, 0); 979 if (pfx_ro.ro_rt != NULL) { 980 msg_rt = *pfx_ro.ro_rt; 981 982 /* QL: XXX 983 * Point the gateway to the new interface 984 * address as if a new prefix route entry has 985 * been added through the new address alias. 986 * All other parts of the rtentry is accurate, 987 * e.g., rt_key, rt_mask, rt_ifp etc. 988 */ 989 msg_rt.rt_gateway = 990 (struct sockaddr *)&target->ia_addr; 991 rt_newaddrmsg(cmd, 992 (struct ifaddr *)target, 993 0, &msg_rt); 994 RTFREE(pfx_ro.ro_rt); 995 } 996 return; 997 } 998 999 /* 1000 * Check if we have a route for the given prefix already or add one accordingly. 1001 */ 1002 static int 1003 in_addprefix(struct in_ifaddr *target, int flags) 1004 { 1005 struct in_ifaddr *ia; 1006 struct in_addr prefix, mask, p, m; 1007 int error; 1008 1009 if ((flags & RTF_HOST) != 0) { 1010 prefix = target->ia_dstaddr.sin_addr; 1011 mask.s_addr = 0; 1012 } else { 1013 prefix = target->ia_addr.sin_addr; 1014 mask = target->ia_sockmask.sin_addr; 1015 prefix.s_addr &= mask.s_addr; 1016 } 1017 1018 IN_IFADDR_RLOCK(); 1019 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1020 if (rtinitflags(ia)) { 1021 p = ia->ia_dstaddr.sin_addr; 1022 1023 if (prefix.s_addr != p.s_addr) 1024 continue; 1025 } else { 1026 p = ia->ia_addr.sin_addr; 1027 m = ia->ia_sockmask.sin_addr; 1028 p.s_addr &= m.s_addr; 1029 1030 if (prefix.s_addr != p.s_addr || 1031 mask.s_addr != m.s_addr) 1032 continue; 1033 } 1034 1035 /* 1036 * If we got a matching prefix route inserted by other 1037 * interface address, we are done here. 1038 */ 1039 if (ia->ia_flags & IFA_ROUTE) { 1040 #ifdef RADIX_MPATH 1041 if (ia->ia_addr.sin_addr.s_addr == 1042 target->ia_addr.sin_addr.s_addr) { 1043 IN_IFADDR_RUNLOCK(); 1044 return (EEXIST); 1045 } else 1046 break; 1047 #endif 1048 if (V_sameprefixcarponly && 1049 target->ia_ifp->if_type != IFT_CARP && 1050 ia->ia_ifp->if_type != IFT_CARP) { 1051 IN_IFADDR_RUNLOCK(); 1052 return (EEXIST); 1053 } else { 1054 in_addralias_rtmsg(RTM_ADD, &prefix, target); 1055 IN_IFADDR_RUNLOCK(); 1056 return (0); 1057 } 1058 } 1059 } 1060 IN_IFADDR_RUNLOCK(); 1061 1062 /* 1063 * No-one seem to have this prefix route, so we try to insert it. 1064 */ 1065 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 1066 if (!error) 1067 target->ia_flags |= IFA_ROUTE; 1068 return (error); 1069 } 1070 1071 extern void arp_ifscrub(struct ifnet *ifp, uint32_t addr); 1072 1073 /* 1074 * If there is no other address in the system that can serve a route to the 1075 * same prefix, remove the route. Hand over the route to the new address 1076 * otherwise. 1077 */ 1078 static int 1079 in_scrubprefix(struct in_ifaddr *target, u_int flags) 1080 { 1081 struct in_ifaddr *ia; 1082 struct in_addr prefix, mask, p; 1083 int error = 0; 1084 struct sockaddr_in prefix0, mask0; 1085 1086 /* 1087 * Remove the loopback route to the interface address. 1088 * The "useloopback" setting is not consulted because if the 1089 * user configures an interface address, turns off this 1090 * setting, and then tries to delete that interface address, 1091 * checking the current setting of "useloopback" would leave 1092 * that interface address loopback route untouched, which 1093 * would be wrong. Therefore the interface address loopback route 1094 * deletion is unconditional. 1095 */ 1096 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) && 1097 !(target->ia_ifp->if_flags & IFF_LOOPBACK) && 1098 (target->ia_flags & IFA_RTSELF)) { 1099 struct route ia_ro; 1100 int freeit = 0; 1101 1102 bzero(&ia_ro, sizeof(ia_ro)); 1103 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = target->ia_addr; 1104 rtalloc_ign_fib(&ia_ro, 0, 0); 1105 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) && 1106 (ia_ro.ro_rt->rt_ifp == V_loif)) { 1107 RT_LOCK(ia_ro.ro_rt); 1108 if (ia_ro.ro_rt->rt_refcnt <= 1) 1109 freeit = 1; 1110 else if (flags & LLE_STATIC) { 1111 RT_REMREF(ia_ro.ro_rt); 1112 target->ia_flags &= ~IFA_RTSELF; 1113 } 1114 RTFREE_LOCKED(ia_ro.ro_rt); 1115 } 1116 if (freeit && (flags & LLE_STATIC)) { 1117 error = ifa_del_loopback_route((struct ifaddr *)target, 1118 (struct sockaddr *)&target->ia_addr); 1119 if (error == 0) 1120 target->ia_flags &= ~IFA_RTSELF; 1121 } 1122 if ((flags & LLE_STATIC) && 1123 !(target->ia_ifp->if_flags & IFF_NOARP)) 1124 /* remove arp cache */ 1125 arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr); 1126 } 1127 1128 if (rtinitflags(target)) 1129 prefix = target->ia_dstaddr.sin_addr; 1130 else { 1131 prefix = target->ia_addr.sin_addr; 1132 mask = target->ia_sockmask.sin_addr; 1133 prefix.s_addr &= mask.s_addr; 1134 } 1135 1136 if ((target->ia_flags & IFA_ROUTE) == 0) { 1137 in_addralias_rtmsg(RTM_DELETE, &prefix, target); 1138 return (0); 1139 } 1140 1141 IN_IFADDR_RLOCK(); 1142 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1143 if (rtinitflags(ia)) 1144 p = ia->ia_dstaddr.sin_addr; 1145 else { 1146 p = ia->ia_addr.sin_addr; 1147 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1148 } 1149 1150 if ((prefix.s_addr != p.s_addr) || 1151 !(ia->ia_ifp->if_flags & IFF_UP)) 1152 continue; 1153 1154 /* 1155 * If we got a matching prefix address, move IFA_ROUTE and 1156 * the route itself to it. Make sure that routing daemons 1157 * get a heads-up. 1158 * 1159 * XXX: a special case for carp(4) interface - this should 1160 * be more generally specified as an interface that 1161 * doesn't support such action. 1162 */ 1163 if ((ia->ia_flags & IFA_ROUTE) == 0 1164 && (ia->ia_ifp->if_type != IFT_CARP)) { 1165 ifa_ref(&ia->ia_ifa); 1166 IN_IFADDR_RUNLOCK(); 1167 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, 1168 rtinitflags(target)); 1169 if (error == 0) 1170 target->ia_flags &= ~IFA_ROUTE; 1171 else 1172 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n", 1173 error); 1174 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 1175 rtinitflags(ia) | RTF_UP); 1176 if (error == 0) 1177 ia->ia_flags |= IFA_ROUTE; 1178 else 1179 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n", 1180 error); 1181 ifa_free(&ia->ia_ifa); 1182 return (error); 1183 } 1184 } 1185 IN_IFADDR_RUNLOCK(); 1186 1187 /* 1188 * remove all L2 entries on the given prefix 1189 */ 1190 bzero(&prefix0, sizeof(prefix0)); 1191 prefix0.sin_len = sizeof(prefix0); 1192 prefix0.sin_family = AF_INET; 1193 prefix0.sin_addr.s_addr = target->ia_subnet; 1194 bzero(&mask0, sizeof(mask0)); 1195 mask0.sin_len = sizeof(mask0); 1196 mask0.sin_family = AF_INET; 1197 mask0.sin_addr.s_addr = target->ia_subnetmask; 1198 lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0, 1199 (struct sockaddr *)&mask0, flags); 1200 1201 /* 1202 * As no-one seem to have this prefix, we can remove the route. 1203 */ 1204 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 1205 if (error == 0) 1206 target->ia_flags &= ~IFA_ROUTE; 1207 else 1208 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error); 1209 return (error); 1210 } 1211 1212 #undef rtinitflags 1213 1214 /* 1215 * Return 1 if the address might be a local broadcast address. 1216 */ 1217 int 1218 in_broadcast(struct in_addr in, struct ifnet *ifp) 1219 { 1220 register struct ifaddr *ifa; 1221 u_long t; 1222 1223 if (in.s_addr == INADDR_BROADCAST || 1224 in.s_addr == INADDR_ANY) 1225 return (1); 1226 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1227 return (0); 1228 t = ntohl(in.s_addr); 1229 /* 1230 * Look through the list of addresses for a match 1231 * with a broadcast address. 1232 */ 1233 #define ia ((struct in_ifaddr *)ifa) 1234 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1235 if (ifa->ifa_addr->sa_family == AF_INET && 1236 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1237 /* 1238 * Check for old-style (host 0) broadcast, but 1239 * taking into account that RFC 3021 obsoletes it. 1240 */ 1241 (ia->ia_subnetmask != IN_RFC3021_MASK && 1242 t == ia->ia_subnet)) && 1243 /* 1244 * Check for an all one subnetmask. These 1245 * only exist when an interface gets a secondary 1246 * address. 1247 */ 1248 ia->ia_subnetmask != (u_long)0xffffffff) 1249 return (1); 1250 return (0); 1251 #undef ia 1252 } 1253 1254 /* 1255 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 1256 */ 1257 void 1258 in_ifdetach(struct ifnet *ifp) 1259 { 1260 1261 in_pcbpurgeif0(&V_ripcbinfo, ifp); 1262 in_pcbpurgeif0(&V_udbinfo, ifp); 1263 in_purgemaddrs(ifp); 1264 } 1265 1266 /* 1267 * Delete all IPv4 multicast address records, and associated link-layer 1268 * multicast address records, associated with ifp. 1269 * XXX It looks like domifdetach runs AFTER the link layer cleanup. 1270 * XXX This should not race with ifma_protospec being set during 1271 * a new allocation, if it does, we have bigger problems. 1272 */ 1273 static void 1274 in_purgemaddrs(struct ifnet *ifp) 1275 { 1276 LIST_HEAD(,in_multi) purgeinms; 1277 struct in_multi *inm, *tinm; 1278 struct ifmultiaddr *ifma; 1279 1280 LIST_INIT(&purgeinms); 1281 IN_MULTI_LOCK(); 1282 1283 /* 1284 * Extract list of in_multi associated with the detaching ifp 1285 * which the PF_INET layer is about to release. 1286 * We need to do this as IF_ADDR_LOCK() may be re-acquired 1287 * by code further down. 1288 */ 1289 IF_ADDR_LOCK(ifp); 1290 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1291 if (ifma->ifma_addr->sa_family != AF_INET || 1292 ifma->ifma_protospec == NULL) 1293 continue; 1294 #if 0 1295 KASSERT(ifma->ifma_protospec != NULL, 1296 ("%s: ifma_protospec is NULL", __func__)); 1297 #endif 1298 inm = (struct in_multi *)ifma->ifma_protospec; 1299 LIST_INSERT_HEAD(&purgeinms, inm, inm_link); 1300 } 1301 IF_ADDR_UNLOCK(ifp); 1302 1303 LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) { 1304 LIST_REMOVE(inm, inm_link); 1305 inm_release_locked(inm); 1306 } 1307 igmp_ifdetach(ifp); 1308 1309 IN_MULTI_UNLOCK(); 1310 } 1311 1312 #include <net/if_dl.h> 1313 #include <netinet/if_ether.h> 1314 1315 struct in_llentry { 1316 struct llentry base; 1317 struct sockaddr_in l3_addr4; 1318 }; 1319 1320 static struct llentry * 1321 in_lltable_new(const struct sockaddr *l3addr, u_int flags) 1322 { 1323 struct in_llentry *lle; 1324 1325 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_DONTWAIT | M_ZERO); 1326 if (lle == NULL) /* NB: caller generates msg */ 1327 return NULL; 1328 1329 callout_init(&lle->base.la_timer, CALLOUT_MPSAFE); 1330 /* 1331 * For IPv4 this will trigger "arpresolve" to generate 1332 * an ARP request. 1333 */ 1334 lle->base.la_expire = time_uptime; /* mark expired */ 1335 lle->l3_addr4 = *(const struct sockaddr_in *)l3addr; 1336 lle->base.lle_refcnt = 1; 1337 LLE_LOCK_INIT(&lle->base); 1338 return &lle->base; 1339 } 1340 1341 /* 1342 * Deletes an address from the address table. 1343 * This function is called by the timer functions 1344 * such as arptimer() and nd6_llinfo_timer(), and 1345 * the caller does the locking. 1346 */ 1347 static void 1348 in_lltable_free(struct lltable *llt, struct llentry *lle) 1349 { 1350 LLE_WUNLOCK(lle); 1351 LLE_LOCK_DESTROY(lle); 1352 free(lle, M_LLTABLE); 1353 } 1354 1355 1356 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 1357 (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 ) 1358 1359 static void 1360 in_lltable_prefix_free(struct lltable *llt, 1361 const struct sockaddr *prefix, 1362 const struct sockaddr *mask, 1363 u_int flags) 1364 { 1365 const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix; 1366 const struct sockaddr_in *msk = (const struct sockaddr_in *)mask; 1367 struct llentry *lle, *next; 1368 register int i; 1369 size_t pkts_dropped; 1370 1371 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) { 1372 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 1373 1374 /* 1375 * (flags & LLE_STATIC) means deleting all entries 1376 * including static ARP entries 1377 */ 1378 if (IN_ARE_MASKED_ADDR_EQUAL((struct sockaddr_in *)L3_ADDR(lle), 1379 pfx, msk) && 1380 ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) { 1381 int canceled; 1382 1383 canceled = callout_drain(&lle->la_timer); 1384 LLE_WLOCK(lle); 1385 if (canceled) 1386 LLE_REMREF(lle); 1387 pkts_dropped = llentry_free(lle); 1388 ARPSTAT_ADD(dropped, pkts_dropped); 1389 } 1390 } 1391 } 1392 } 1393 1394 1395 static int 1396 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr) 1397 { 1398 struct rtentry *rt; 1399 1400 KASSERT(l3addr->sa_family == AF_INET, 1401 ("sin_family %d", l3addr->sa_family)); 1402 1403 /* XXX rtalloc1 should take a const param */ 1404 rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0); 1405 1406 if (rt == NULL) 1407 return (EINVAL); 1408 1409 /* 1410 * If the gateway for an existing host route matches the target L3 1411 * address, which is a special route inserted by some implementation 1412 * such as MANET, and the interface is of the correct type, then 1413 * allow for ARP to proceed. 1414 */ 1415 if (rt->rt_flags & RTF_GATEWAY) { 1416 if (!(rt->rt_flags & RTF_HOST) || !rt->rt_ifp || 1417 rt->rt_ifp->if_type != IFT_ETHER || 1418 (rt->rt_ifp->if_flags & 1419 (IFF_NOARP | IFF_STATICARP)) != 0 || 1420 memcmp(rt->rt_gateway->sa_data, l3addr->sa_data, 1421 sizeof(in_addr_t)) != 0) { 1422 RTFREE_LOCKED(rt); 1423 return (EINVAL); 1424 } 1425 } 1426 1427 /* 1428 * Make sure that at least the destination address is covered 1429 * by the route. This is for handling the case where 2 or more 1430 * interfaces have the same prefix. An incoming packet arrives 1431 * on one interface and the corresponding outgoing packet leaves 1432 * another interface. 1433 */ 1434 if (!(rt->rt_flags & RTF_HOST) && rt->rt_ifp != ifp) { 1435 const char *sa, *mask, *addr, *lim; 1436 int len; 1437 1438 mask = (const char *)rt_mask(rt); 1439 /* 1440 * Just being extra cautious to avoid some custom 1441 * code getting into trouble. 1442 */ 1443 if (mask == NULL) { 1444 RTFREE_LOCKED(rt); 1445 return (EINVAL); 1446 } 1447 1448 sa = (const char *)rt_key(rt); 1449 addr = (const char *)l3addr; 1450 len = ((const struct sockaddr_in *)l3addr)->sin_len; 1451 lim = addr + len; 1452 1453 for ( ; addr < lim; sa++, mask++, addr++) { 1454 if ((*sa ^ *addr) & *mask) { 1455 #ifdef DIAGNOSTIC 1456 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n", 1457 inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr)); 1458 #endif 1459 RTFREE_LOCKED(rt); 1460 return (EINVAL); 1461 } 1462 } 1463 } 1464 1465 RTFREE_LOCKED(rt); 1466 return (0); 1467 } 1468 1469 /* 1470 * Return NULL if not found or marked for deletion. 1471 * If found return lle read locked. 1472 */ 1473 static struct llentry * 1474 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1475 { 1476 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1477 struct ifnet *ifp = llt->llt_ifp; 1478 struct llentry *lle; 1479 struct llentries *lleh; 1480 u_int hashkey; 1481 1482 IF_AFDATA_LOCK_ASSERT(ifp); 1483 KASSERT(l3addr->sa_family == AF_INET, 1484 ("sin_family %d", l3addr->sa_family)); 1485 1486 hashkey = sin->sin_addr.s_addr; 1487 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 1488 LIST_FOREACH(lle, lleh, lle_next) { 1489 struct sockaddr_in *sa2 = (struct sockaddr_in *)L3_ADDR(lle); 1490 if (lle->la_flags & LLE_DELETED) 1491 continue; 1492 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr) 1493 break; 1494 } 1495 if (lle == NULL) { 1496 #ifdef DIAGNOSTIC 1497 if (flags & LLE_DELETE) 1498 log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle); 1499 #endif 1500 if (!(flags & LLE_CREATE)) 1501 return (NULL); 1502 /* 1503 * A route that covers the given address must have 1504 * been installed 1st because we are doing a resolution, 1505 * verify this. 1506 */ 1507 if (!(flags & LLE_IFADDR) && 1508 in_lltable_rtcheck(ifp, flags, l3addr) != 0) 1509 goto done; 1510 1511 lle = in_lltable_new(l3addr, flags); 1512 if (lle == NULL) { 1513 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 1514 goto done; 1515 } 1516 lle->la_flags = flags & ~LLE_CREATE; 1517 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 1518 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 1519 lle->la_flags |= (LLE_VALID | LLE_STATIC); 1520 } 1521 1522 lle->lle_tbl = llt; 1523 lle->lle_head = lleh; 1524 LIST_INSERT_HEAD(lleh, lle, lle_next); 1525 } else if (flags & LLE_DELETE) { 1526 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 1527 LLE_WLOCK(lle); 1528 lle->la_flags = LLE_DELETED; 1529 EVENTHANDLER_INVOKE(arp_update_event, lle); 1530 LLE_WUNLOCK(lle); 1531 #ifdef DIAGNOSTIC 1532 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 1533 #endif 1534 } 1535 lle = (void *)-1; 1536 1537 } 1538 if (LLE_IS_VALID(lle)) { 1539 if (flags & LLE_EXCLUSIVE) 1540 LLE_WLOCK(lle); 1541 else 1542 LLE_RLOCK(lle); 1543 } 1544 done: 1545 return (lle); 1546 } 1547 1548 static int 1549 in_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 1550 { 1551 #define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle)) 1552 struct ifnet *ifp = llt->llt_ifp; 1553 struct llentry *lle; 1554 /* XXX stack use */ 1555 struct { 1556 struct rt_msghdr rtm; 1557 struct sockaddr_inarp sin; 1558 struct sockaddr_dl sdl; 1559 } arpc; 1560 int error, i; 1561 1562 LLTABLE_LOCK_ASSERT(); 1563 1564 error = 0; 1565 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1566 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 1567 struct sockaddr_dl *sdl; 1568 1569 /* skip deleted entries */ 1570 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 1571 continue; 1572 /* Skip if jailed and not a valid IP of the prison. */ 1573 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 1574 continue; 1575 /* 1576 * produce a msg made of: 1577 * struct rt_msghdr; 1578 * struct sockaddr_inarp; (IPv4) 1579 * struct sockaddr_dl; 1580 */ 1581 bzero(&arpc, sizeof(arpc)); 1582 arpc.rtm.rtm_msglen = sizeof(arpc); 1583 arpc.rtm.rtm_version = RTM_VERSION; 1584 arpc.rtm.rtm_type = RTM_GET; 1585 arpc.rtm.rtm_flags = RTF_UP; 1586 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1587 arpc.sin.sin_family = AF_INET; 1588 arpc.sin.sin_len = sizeof(arpc.sin); 1589 arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr; 1590 1591 /* publish */ 1592 if (lle->la_flags & LLE_PUB) { 1593 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1594 /* proxy only */ 1595 if (lle->la_flags & LLE_PROXY) 1596 arpc.sin.sin_other = SIN_PROXY; 1597 } 1598 1599 sdl = &arpc.sdl; 1600 sdl->sdl_family = AF_LINK; 1601 sdl->sdl_len = sizeof(*sdl); 1602 sdl->sdl_index = ifp->if_index; 1603 sdl->sdl_type = ifp->if_type; 1604 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 1605 sdl->sdl_alen = ifp->if_addrlen; 1606 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1607 } else { 1608 sdl->sdl_alen = 0; 1609 bzero(LLADDR(sdl), ifp->if_addrlen); 1610 } 1611 1612 arpc.rtm.rtm_rmx.rmx_expire = 1613 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1614 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1615 if (lle->la_flags & LLE_STATIC) 1616 arpc.rtm.rtm_flags |= RTF_STATIC; 1617 arpc.rtm.rtm_index = ifp->if_index; 1618 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1619 if (error) 1620 break; 1621 } 1622 } 1623 return error; 1624 #undef SIN 1625 } 1626 1627 void * 1628 in_domifattach(struct ifnet *ifp) 1629 { 1630 struct in_ifinfo *ii; 1631 struct lltable *llt; 1632 1633 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); 1634 1635 llt = lltable_init(ifp, AF_INET); 1636 if (llt != NULL) { 1637 llt->llt_free = in_lltable_free; 1638 llt->llt_prefix_free = in_lltable_prefix_free; 1639 llt->llt_lookup = in_lltable_lookup; 1640 llt->llt_dump = in_lltable_dump; 1641 } 1642 ii->ii_llt = llt; 1643 1644 ii->ii_igmp = igmp_domifattach(ifp); 1645 1646 return ii; 1647 } 1648 1649 void 1650 in_domifdetach(struct ifnet *ifp, void *aux) 1651 { 1652 struct in_ifinfo *ii = (struct in_ifinfo *)aux; 1653 1654 igmp_domifdetach(ifp); 1655 lltable_free(ii->ii_llt); 1656 free(ii, M_IFADDR); 1657 }
Cache object: fad098e7529075e903e6ff49d5fdaf3d
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