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/10.4/sys/netinet/in.c 309340 2016-11-30 22:20:23Z vangyzen $"); 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/if_ether.h> 60 #include <netinet/in.h> 61 #include <netinet/in_var.h> 62 #include <netinet/in_pcb.h> 63 #include <netinet/ip_var.h> 64 #include <netinet/ip_carp.h> 65 #include <netinet/igmp_var.h> 66 #include <netinet/udp.h> 67 #include <netinet/udp_var.h> 68 69 static int in_mask2len(struct in_addr *); 70 static void in_len2mask(struct in_addr *, int); 71 static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, 72 struct ifnet *, struct thread *); 73 74 static void in_socktrim(struct sockaddr_in *); 75 static int in_ifinit(struct ifnet *, struct in_ifaddr *, 76 struct sockaddr_in *, int, int); 77 static void in_purgemaddrs(struct ifnet *); 78 79 static VNET_DEFINE(int, nosameprefix); 80 #define V_nosameprefix VNET(nosameprefix) 81 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_RW, 82 &VNET_NAME(nosameprefix), 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 /* 89 * Return 1 if an internet address is for a ``local'' host 90 * (one to which we have a connection). 91 */ 92 int 93 in_localaddr(struct in_addr in) 94 { 95 register u_long i = ntohl(in.s_addr); 96 register struct in_ifaddr *ia; 97 98 IN_IFADDR_RLOCK(); 99 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 100 if ((i & ia->ia_subnetmask) == ia->ia_subnet) { 101 IN_IFADDR_RUNLOCK(); 102 return (1); 103 } 104 } 105 IN_IFADDR_RUNLOCK(); 106 return (0); 107 } 108 109 /* 110 * Return 1 if an internet address is for the local host and configured 111 * on one of its interfaces. 112 */ 113 int 114 in_localip(struct in_addr in) 115 { 116 struct in_ifaddr *ia; 117 118 IN_IFADDR_RLOCK(); 119 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { 120 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) { 121 IN_IFADDR_RUNLOCK(); 122 return (1); 123 } 124 } 125 IN_IFADDR_RUNLOCK(); 126 return (0); 127 } 128 129 /* 130 * Determine whether an IP address is in a reserved set of addresses 131 * that may not be forwarded, or whether datagrams to that destination 132 * may be forwarded. 133 */ 134 int 135 in_canforward(struct in_addr in) 136 { 137 register u_long i = ntohl(in.s_addr); 138 register u_long net; 139 140 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i)) 141 return (0); 142 if (IN_CLASSA(i)) { 143 net = i & IN_CLASSA_NET; 144 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 145 return (0); 146 } 147 return (1); 148 } 149 150 /* 151 * Trim a mask in a sockaddr 152 */ 153 static void 154 in_socktrim(struct sockaddr_in *ap) 155 { 156 register char *cplim = (char *) &ap->sin_addr; 157 register char *cp = (char *) (&ap->sin_addr + 1); 158 159 ap->sin_len = 0; 160 while (--cp >= cplim) 161 if (*cp) { 162 (ap)->sin_len = cp - (char *) (ap) + 1; 163 break; 164 } 165 } 166 167 static int 168 in_mask2len(mask) 169 struct in_addr *mask; 170 { 171 int x, y; 172 u_char *p; 173 174 p = (u_char *)mask; 175 for (x = 0; x < sizeof(*mask); x++) { 176 if (p[x] != 0xff) 177 break; 178 } 179 y = 0; 180 if (x < sizeof(*mask)) { 181 for (y = 0; y < 8; y++) { 182 if ((p[x] & (0x80 >> y)) == 0) 183 break; 184 } 185 } 186 return (x * 8 + y); 187 } 188 189 static void 190 in_len2mask(struct in_addr *mask, int len) 191 { 192 int i; 193 u_char *p; 194 195 p = (u_char *)mask; 196 bzero(mask, sizeof(*mask)); 197 for (i = 0; i < len / 8; i++) 198 p[i] = 0xff; 199 if (len % 8) 200 p[i] = (0xff00 >> (len % 8)) & 0xff; 201 } 202 203 /* 204 * Generic internet control operations (ioctl's). 205 * 206 * ifp is NULL if not an interface-specific ioctl. 207 */ 208 /* ARGSUSED */ 209 int 210 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 211 struct thread *td) 212 { 213 register struct ifreq *ifr = (struct ifreq *)data; 214 register struct in_ifaddr *ia, *iap; 215 register struct ifaddr *ifa; 216 struct in_addr allhosts_addr; 217 struct in_addr dst; 218 struct in_ifinfo *ii; 219 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 220 int error, hostIsNew, iaIsNew, maskIsNew; 221 int iaIsFirst; 222 u_long ocmd = cmd; 223 224 /* 225 * Pre-10.x compat: OSIOCAIFADDR passes a shorter 226 * struct in_aliasreq, without ifra_vhid. 227 */ 228 if (cmd == OSIOCAIFADDR) 229 cmd = SIOCAIFADDR; 230 231 ia = NULL; 232 iaIsFirst = 0; 233 iaIsNew = 0; 234 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 235 236 /* 237 * Filter out ioctls we implement directly; forward the rest on to 238 * in_lifaddr_ioctl() and ifp->if_ioctl(). 239 */ 240 switch (cmd) { 241 case SIOCGIFADDR: 242 case SIOCGIFBRDADDR: 243 case SIOCGIFDSTADDR: 244 case SIOCGIFNETMASK: 245 case SIOCDIFADDR: 246 break; 247 case SIOCAIFADDR: 248 /* 249 * ifra_addr must be present and be of INET family. 250 * ifra_broadaddr and ifra_mask are optional. 251 */ 252 if (ifra->ifra_addr.sin_len != sizeof(struct sockaddr_in) || 253 ifra->ifra_addr.sin_family != AF_INET) 254 return (EINVAL); 255 if (ifra->ifra_broadaddr.sin_len != 0 && 256 (ifra->ifra_broadaddr.sin_len != 257 sizeof(struct sockaddr_in) || 258 ifra->ifra_broadaddr.sin_family != AF_INET)) 259 return (EINVAL); 260 #if 0 261 /* 262 * ifconfig(8) in pre-10.x doesn't set sin_family for the 263 * mask. The code is disabled for the 10.x timeline, to 264 * make SIOCAIFADDR compatible with 9.x ifconfig(8). 265 * The code should be enabled in 11.x 266 */ 267 if (ifra->ifra_mask.sin_len != 0 && 268 (ifra->ifra_mask.sin_len != sizeof(struct sockaddr_in) || 269 ifra->ifra_mask.sin_family != AF_INET)) 270 return (EINVAL); 271 #endif 272 break; 273 case SIOCSIFADDR: 274 case SIOCSIFBRDADDR: 275 case SIOCSIFDSTADDR: 276 case SIOCSIFNETMASK: 277 /* We no longer support that old commands. */ 278 return (EINVAL); 279 280 case SIOCALIFADDR: 281 if (td != NULL) { 282 error = priv_check(td, PRIV_NET_ADDIFADDR); 283 if (error) 284 return (error); 285 } 286 if (ifp == NULL) 287 return (EINVAL); 288 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 289 290 case SIOCDLIFADDR: 291 if (td != NULL) { 292 error = priv_check(td, PRIV_NET_DELIFADDR); 293 if (error) 294 return (error); 295 } 296 if (ifp == NULL) 297 return (EINVAL); 298 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 299 300 case SIOCGLIFADDR: 301 if (ifp == NULL) 302 return (EINVAL); 303 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 304 305 default: 306 if (ifp == NULL || ifp->if_ioctl == NULL) 307 return (EOPNOTSUPP); 308 return ((*ifp->if_ioctl)(ifp, cmd, data)); 309 } 310 311 if (ifp == NULL) 312 return (EADDRNOTAVAIL); 313 314 /* 315 * Security checks before we get involved in any work. 316 */ 317 switch (cmd) { 318 case SIOCAIFADDR: 319 if (td != NULL) { 320 error = priv_check(td, PRIV_NET_ADDIFADDR); 321 if (error) 322 return (error); 323 } 324 break; 325 326 case SIOCDIFADDR: 327 if (td != NULL) { 328 error = priv_check(td, PRIV_NET_DELIFADDR); 329 if (error) 330 return (error); 331 } 332 break; 333 } 334 335 /* 336 * Find address for this interface, if it exists. 337 * 338 * If an alias address was specified, find that one instead of the 339 * first one on the interface, if possible. 340 */ 341 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 342 IN_IFADDR_RLOCK(); 343 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) { 344 if (iap->ia_ifp == ifp && 345 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 346 if (td == NULL || prison_check_ip4(td->td_ucred, 347 &dst) == 0) 348 ia = iap; 349 break; 350 } 351 } 352 if (ia != NULL) 353 ifa_ref(&ia->ia_ifa); 354 IN_IFADDR_RUNLOCK(); 355 if (ia == NULL) { 356 IF_ADDR_RLOCK(ifp); 357 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 358 iap = ifatoia(ifa); 359 if (iap->ia_addr.sin_family == AF_INET) { 360 if (td != NULL && 361 prison_check_ip4(td->td_ucred, 362 &iap->ia_addr.sin_addr) != 0) 363 continue; 364 ia = iap; 365 break; 366 } 367 } 368 if (ia != NULL) 369 ifa_ref(&ia->ia_ifa); 370 IF_ADDR_RUNLOCK(ifp); 371 } 372 if (ia == NULL) 373 iaIsFirst = 1; 374 375 error = 0; 376 switch (cmd) { 377 case SIOCAIFADDR: 378 case SIOCDIFADDR: 379 if (ifra->ifra_addr.sin_family == AF_INET) { 380 struct in_ifaddr *oia; 381 382 IN_IFADDR_RLOCK(); 383 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 384 if (ia->ia_ifp == ifp && 385 ia->ia_addr.sin_addr.s_addr == 386 ifra->ifra_addr.sin_addr.s_addr) 387 break; 388 } 389 if (ia != NULL && ia != oia) 390 ifa_ref(&ia->ia_ifa); 391 if (oia != NULL && ia != oia) 392 ifa_free(&oia->ia_ifa); 393 IN_IFADDR_RUNLOCK(); 394 if ((ifp->if_flags & IFF_POINTOPOINT) 395 && (cmd == SIOCAIFADDR) 396 && (ifra->ifra_dstaddr.sin_addr.s_addr 397 == INADDR_ANY)) { 398 error = EDESTADDRREQ; 399 goto out; 400 } 401 } 402 if (cmd == SIOCDIFADDR && ia == NULL) { 403 error = EADDRNOTAVAIL; 404 goto out; 405 } 406 if (ia == NULL) { 407 ia = (struct in_ifaddr *) 408 malloc(sizeof *ia, M_IFADDR, M_NOWAIT | 409 M_ZERO); 410 if (ia == NULL) { 411 error = ENOBUFS; 412 goto out; 413 } 414 415 ifa = &ia->ia_ifa; 416 ifa_init(ifa); 417 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 418 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 419 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 420 callout_init_mtx(&ia->ia_garp_timer, &ifa->ifa_mtx, 421 CALLOUT_RETURNUNLOCKED); 422 423 ia->ia_sockmask.sin_len = 8; 424 ia->ia_sockmask.sin_family = AF_INET; 425 if (ifp->if_flags & IFF_BROADCAST) { 426 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 427 ia->ia_broadaddr.sin_family = AF_INET; 428 } 429 ia->ia_ifp = ifp; 430 431 ifa_ref(ifa); /* if_addrhead */ 432 IF_ADDR_WLOCK(ifp); 433 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 434 IF_ADDR_WUNLOCK(ifp); 435 ifa_ref(ifa); /* in_ifaddrhead */ 436 IN_IFADDR_WLOCK(); 437 TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link); 438 IN_IFADDR_WUNLOCK(); 439 iaIsNew = 1; 440 } 441 break; 442 443 case SIOCGIFADDR: 444 case SIOCGIFNETMASK: 445 case SIOCGIFDSTADDR: 446 case SIOCGIFBRDADDR: 447 if (ia == NULL) { 448 error = EADDRNOTAVAIL; 449 goto out; 450 } 451 break; 452 } 453 454 /* 455 * Most paths in this switch return directly or via out. Only paths 456 * that remove the address break in order to hit common removal code. 457 */ 458 switch (cmd) { 459 case SIOCGIFADDR: 460 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 461 goto out; 462 463 case SIOCGIFBRDADDR: 464 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 465 error = EINVAL; 466 goto out; 467 } 468 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 469 goto out; 470 471 case SIOCGIFDSTADDR: 472 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 473 error = EINVAL; 474 goto out; 475 } 476 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 477 goto out; 478 479 case SIOCGIFNETMASK: 480 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 481 goto out; 482 483 case SIOCAIFADDR: 484 maskIsNew = 0; 485 hostIsNew = 1; 486 error = 0; 487 if (ifra->ifra_addr.sin_addr.s_addr == 488 ia->ia_addr.sin_addr.s_addr) 489 hostIsNew = 0; 490 if (ifra->ifra_mask.sin_len) { 491 /* 492 * QL: XXX 493 * Need to scrub the prefix here in case 494 * the issued command is SIOCAIFADDR with 495 * the same address, but with a different 496 * prefix length. And if the prefix length 497 * is the same as before, then the call is 498 * un-necessarily executed here. 499 */ 500 in_ifscrub(ifp, ia, LLE_STATIC); 501 ia->ia_sockmask = ifra->ifra_mask; 502 ia->ia_sockmask.sin_family = AF_INET; 503 ia->ia_subnetmask = 504 ntohl(ia->ia_sockmask.sin_addr.s_addr); 505 maskIsNew = 1; 506 } 507 if ((ifp->if_flags & IFF_POINTOPOINT) && 508 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 509 in_ifscrub(ifp, ia, LLE_STATIC); 510 ia->ia_dstaddr = ifra->ifra_dstaddr; 511 maskIsNew = 1; /* We lie; but the effect's the same */ 512 } 513 if (hostIsNew || maskIsNew) 514 error = in_ifinit(ifp, ia, &ifra->ifra_addr, maskIsNew, 515 (ocmd == cmd ? ifra->ifra_vhid : 0)); 516 if (error != 0 && iaIsNew) 517 break; 518 519 if ((ifp->if_flags & IFF_BROADCAST) && 520 ifra->ifra_broadaddr.sin_len) 521 ia->ia_broadaddr = ifra->ifra_broadaddr; 522 if (error == 0) { 523 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 524 if (iaIsFirst && 525 (ifp->if_flags & IFF_MULTICAST) != 0) { 526 error = in_joingroup(ifp, &allhosts_addr, 527 NULL, &ii->ii_allhosts); 528 } 529 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 530 } 531 goto out; 532 533 case SIOCDIFADDR: 534 /* 535 * in_ifscrub kills the interface route. 536 */ 537 in_ifscrub(ifp, ia, LLE_STATIC); 538 539 /* 540 * in_ifadown gets rid of all the rest of 541 * the routes. This is not quite the right 542 * thing to do, but at least if we are running 543 * a routing process they will come back. 544 */ 545 in_ifadown(&ia->ia_ifa, 1); 546 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 547 error = 0; 548 break; 549 550 default: 551 panic("in_control: unsupported ioctl"); 552 } 553 554 if (ia->ia_ifa.ifa_carp) 555 (*carp_detach_p)(&ia->ia_ifa); 556 557 IF_ADDR_WLOCK(ifp); 558 /* Re-check that ia is still part of the list. */ 559 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 560 if (ifa == &ia->ia_ifa) 561 break; 562 } 563 if (ifa == NULL) { 564 /* 565 * If we lost the race with another thread, there is no need to 566 * try it again for the next loop as there is no other exit 567 * path between here and out. 568 */ 569 IF_ADDR_WUNLOCK(ifp); 570 error = EADDRNOTAVAIL; 571 goto out; 572 } 573 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 574 IF_ADDR_WUNLOCK(ifp); 575 ifa_free(&ia->ia_ifa); /* if_addrhead */ 576 577 IN_IFADDR_WLOCK(); 578 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link); 579 580 LIST_REMOVE(ia, ia_hash); 581 IN_IFADDR_WUNLOCK(); 582 /* 583 * If this is the last IPv4 address configured on this 584 * interface, leave the all-hosts group. 585 * No state-change report need be transmitted. 586 */ 587 IFP_TO_IA(ifp, iap); 588 if (iap == NULL) { 589 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 590 IN_MULTI_LOCK(); 591 if (ii->ii_allhosts) { 592 (void)in_leavegroup_locked(ii->ii_allhosts, NULL); 593 ii->ii_allhosts = NULL; 594 } 595 IN_MULTI_UNLOCK(); 596 } else 597 ifa_free(&iap->ia_ifa); 598 599 IFA_LOCK(&ia->ia_ifa); 600 if (callout_stop(&ia->ia_garp_timer)) 601 ifa_free(&ia->ia_ifa); 602 IFA_UNLOCK(&ia->ia_ifa); 603 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 604 out: 605 if (ia != NULL) 606 ifa_free(&ia->ia_ifa); 607 return (error); 608 } 609 610 /* 611 * SIOC[GAD]LIFADDR. 612 * SIOCGLIFADDR: get first address. (?!?) 613 * SIOCGLIFADDR with IFLR_PREFIX: 614 * get first address that matches the specified prefix. 615 * SIOCALIFADDR: add the specified address. 616 * SIOCALIFADDR with IFLR_PREFIX: 617 * EINVAL since we can't deduce hostid part of the address. 618 * SIOCDLIFADDR: delete the specified address. 619 * SIOCDLIFADDR with IFLR_PREFIX: 620 * delete the first address that matches the specified prefix. 621 * return values: 622 * EINVAL on invalid parameters 623 * EADDRNOTAVAIL on prefix match failed/specified address not found 624 * other values may be returned from in_ioctl() 625 */ 626 static int 627 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 628 struct ifnet *ifp, struct thread *td) 629 { 630 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 631 struct ifaddr *ifa; 632 633 /* sanity checks */ 634 if (data == NULL || ifp == NULL) { 635 panic("invalid argument to in_lifaddr_ioctl"); 636 /*NOTRECHED*/ 637 } 638 639 switch (cmd) { 640 case SIOCGLIFADDR: 641 /* address must be specified on GET with IFLR_PREFIX */ 642 if ((iflr->flags & IFLR_PREFIX) == 0) 643 break; 644 /*FALLTHROUGH*/ 645 case SIOCALIFADDR: 646 case SIOCDLIFADDR: 647 /* address must be specified on ADD and DELETE */ 648 if (iflr->addr.ss_family != AF_INET) 649 return (EINVAL); 650 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 651 return (EINVAL); 652 /* XXX need improvement */ 653 if (iflr->dstaddr.ss_family 654 && iflr->dstaddr.ss_family != AF_INET) 655 return (EINVAL); 656 if (iflr->dstaddr.ss_family 657 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 658 return (EINVAL); 659 break; 660 default: /*shouldn't happen*/ 661 return (EOPNOTSUPP); 662 } 663 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 664 return (EINVAL); 665 666 switch (cmd) { 667 case SIOCALIFADDR: 668 { 669 struct in_aliasreq ifra; 670 671 if (iflr->flags & IFLR_PREFIX) 672 return (EINVAL); 673 674 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR). */ 675 bzero(&ifra, sizeof(ifra)); 676 bcopy(iflr->iflr_name, ifra.ifra_name, 677 sizeof(ifra.ifra_name)); 678 679 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 680 681 if (iflr->dstaddr.ss_family) { /*XXX*/ 682 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 683 iflr->dstaddr.ss_len); 684 } 685 686 ifra.ifra_mask.sin_family = AF_INET; 687 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 688 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 689 690 return (in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td)); 691 } 692 case SIOCGLIFADDR: 693 case SIOCDLIFADDR: 694 { 695 struct in_ifaddr *ia; 696 struct in_addr mask, candidate, match; 697 struct sockaddr_in *sin; 698 699 bzero(&mask, sizeof(mask)); 700 bzero(&match, sizeof(match)); 701 if (iflr->flags & IFLR_PREFIX) { 702 /* lookup a prefix rather than address. */ 703 in_len2mask(&mask, iflr->prefixlen); 704 705 sin = (struct sockaddr_in *)&iflr->addr; 706 match.s_addr = sin->sin_addr.s_addr; 707 match.s_addr &= mask.s_addr; 708 709 /* if you set extra bits, that's wrong */ 710 if (match.s_addr != sin->sin_addr.s_addr) 711 return (EINVAL); 712 713 } else { 714 /* on getting an address, take the 1st match */ 715 /* on deleting an address, do exact match */ 716 if (cmd != SIOCGLIFADDR) { 717 in_len2mask(&mask, 32); 718 sin = (struct sockaddr_in *)&iflr->addr; 719 match.s_addr = sin->sin_addr.s_addr; 720 } 721 } 722 723 IF_ADDR_RLOCK(ifp); 724 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 725 if (ifa->ifa_addr->sa_family != AF_INET) 726 continue; 727 if (match.s_addr == 0) 728 break; 729 sin = (struct sockaddr_in *)&ifa->ifa_addr; 730 candidate.s_addr = sin->sin_addr.s_addr; 731 candidate.s_addr &= mask.s_addr; 732 if (candidate.s_addr == match.s_addr) 733 break; 734 } 735 if (ifa != NULL) 736 ifa_ref(ifa); 737 IF_ADDR_RUNLOCK(ifp); 738 if (ifa == NULL) 739 return (EADDRNOTAVAIL); 740 ia = (struct in_ifaddr *)ifa; 741 742 if (cmd == SIOCGLIFADDR) { 743 /* fill in the if_laddrreq structure */ 744 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 745 746 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 747 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 748 ia->ia_dstaddr.sin_len); 749 } else 750 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 751 752 iflr->prefixlen = 753 in_mask2len(&ia->ia_sockmask.sin_addr); 754 755 iflr->flags = 0; /*XXX*/ 756 ifa_free(ifa); 757 758 return (0); 759 } else { 760 struct in_aliasreq ifra; 761 762 /* fill in_aliasreq and do ioctl(SIOCDIFADDR) */ 763 bzero(&ifra, sizeof(ifra)); 764 bcopy(iflr->iflr_name, ifra.ifra_name, 765 sizeof(ifra.ifra_name)); 766 767 bcopy(&ia->ia_addr, &ifra.ifra_addr, 768 ia->ia_addr.sin_len); 769 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 770 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 771 ia->ia_dstaddr.sin_len); 772 } 773 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 774 ia->ia_sockmask.sin_len); 775 ifa_free(ifa); 776 777 return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 778 ifp, td)); 779 } 780 } 781 } 782 783 return (EOPNOTSUPP); /*just for safety*/ 784 } 785 786 /* 787 * Delete any existing route for an interface. 788 */ 789 void 790 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia, u_int flags) 791 { 792 793 in_scrubprefix(ia, flags); 794 } 795 796 /* 797 * Initialize an interface's internet address 798 * and routing table entry. 799 */ 800 static int 801 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, 802 int masksupplied, int vhid) 803 { 804 register u_long i = ntohl(sin->sin_addr.s_addr); 805 int flags, error = 0; 806 807 IN_IFADDR_WLOCK(); 808 if (ia->ia_addr.sin_family == AF_INET) 809 LIST_REMOVE(ia, ia_hash); 810 ia->ia_addr = *sin; 811 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 812 ia, ia_hash); 813 IN_IFADDR_WUNLOCK(); 814 815 if (vhid > 0) { 816 if (carp_attach_p != NULL) 817 error = (*carp_attach_p)(&ia->ia_ifa, vhid); 818 else 819 error = EPROTONOSUPPORT; 820 } 821 if (error) 822 return (error); 823 824 /* 825 * Give the interface a chance to initialize 826 * if this is its first address, 827 * and to validate the address if necessary. 828 */ 829 if (ifp->if_ioctl != NULL && 830 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia)) != 0) 831 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 832 return (error); 833 834 /* 835 * Be compatible with network classes, if netmask isn't supplied, 836 * guess it based on classes. 837 */ 838 if (!masksupplied) { 839 if (IN_CLASSA(i)) 840 ia->ia_subnetmask = IN_CLASSA_NET; 841 else if (IN_CLASSB(i)) 842 ia->ia_subnetmask = IN_CLASSB_NET; 843 else 844 ia->ia_subnetmask = IN_CLASSC_NET; 845 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 846 } 847 ia->ia_subnet = i & ia->ia_subnetmask; 848 in_socktrim(&ia->ia_sockmask); 849 850 /* 851 * Add route for the network. 852 */ 853 flags = RTF_UP; 854 ia->ia_ifa.ifa_metric = ifp->if_metric; 855 if (ifp->if_flags & IFF_BROADCAST) { 856 if (ia->ia_subnetmask == IN_RFC3021_MASK) 857 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST; 858 else 859 ia->ia_broadaddr.sin_addr.s_addr = 860 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 861 } else if (ifp->if_flags & IFF_LOOPBACK) { 862 ia->ia_dstaddr = ia->ia_addr; 863 flags |= RTF_HOST; 864 } else if (ifp->if_flags & IFF_POINTOPOINT) { 865 if (ia->ia_dstaddr.sin_family != AF_INET) 866 return (0); 867 flags |= RTF_HOST; 868 } 869 if (!vhid && (error = in_addprefix(ia, flags)) != 0) 870 return (error); 871 872 if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY) 873 return (0); 874 875 if (ifp->if_flags & IFF_POINTOPOINT && 876 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 877 return (0); 878 879 /* 880 * add a loopback route to self 881 */ 882 if (V_useloopback && !vhid && !(ifp->if_flags & IFF_LOOPBACK)) { 883 struct route ia_ro; 884 885 bzero(&ia_ro, sizeof(ia_ro)); 886 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = ia->ia_addr; 887 rtalloc_ign_fib(&ia_ro, 0, RT_DEFAULT_FIB); 888 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) && 889 (ia_ro.ro_rt->rt_ifp == V_loif)) { 890 RT_LOCK(ia_ro.ro_rt); 891 RT_ADDREF(ia_ro.ro_rt); 892 RTFREE_LOCKED(ia_ro.ro_rt); 893 } else 894 error = ifa_add_loopback_route((struct ifaddr *)ia, 895 (struct sockaddr *)&ia->ia_addr); 896 if (error == 0) 897 ia->ia_flags |= IFA_RTSELF; 898 if (ia_ro.ro_rt != NULL) 899 RTFREE(ia_ro.ro_rt); 900 } 901 902 return (error); 903 } 904 905 #define rtinitflags(x) \ 906 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \ 907 ? RTF_HOST : 0) 908 909 /* 910 * Check if we have a route for the given prefix already or add one accordingly. 911 */ 912 int 913 in_addprefix(struct in_ifaddr *target, int flags) 914 { 915 struct in_ifaddr *ia; 916 struct in_addr prefix, mask, p, m; 917 int error; 918 919 if ((flags & RTF_HOST) != 0) { 920 prefix = target->ia_dstaddr.sin_addr; 921 mask.s_addr = 0; 922 } else { 923 prefix = target->ia_addr.sin_addr; 924 mask = target->ia_sockmask.sin_addr; 925 prefix.s_addr &= mask.s_addr; 926 } 927 928 IN_IFADDR_RLOCK(); 929 /* Look for an existing address with the same prefix, mask, and fib */ 930 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 931 if (rtinitflags(ia)) { 932 p = ia->ia_dstaddr.sin_addr; 933 934 if (prefix.s_addr != p.s_addr) 935 continue; 936 } else { 937 p = ia->ia_addr.sin_addr; 938 m = ia->ia_sockmask.sin_addr; 939 p.s_addr &= m.s_addr; 940 941 if (prefix.s_addr != p.s_addr || 942 mask.s_addr != m.s_addr) 943 continue; 944 } 945 if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib) 946 continue; 947 948 /* 949 * If we got a matching prefix route inserted by other 950 * interface address, we are done here. 951 */ 952 if (ia->ia_flags & IFA_ROUTE) { 953 #ifdef RADIX_MPATH 954 if (ia->ia_addr.sin_addr.s_addr == 955 target->ia_addr.sin_addr.s_addr) { 956 IN_IFADDR_RUNLOCK(); 957 return (EEXIST); 958 } else 959 break; 960 #endif 961 if (V_nosameprefix) { 962 IN_IFADDR_RUNLOCK(); 963 return (EEXIST); 964 } else { 965 int fibnum; 966 967 fibnum = rt_add_addr_allfibs ? RT_ALL_FIBS : 968 target->ia_ifp->if_fib; 969 rt_addrmsg(RTM_ADD, &target->ia_ifa, fibnum); 970 IN_IFADDR_RUNLOCK(); 971 return (0); 972 } 973 } 974 } 975 IN_IFADDR_RUNLOCK(); 976 977 /* 978 * No-one seem to have this prefix route, so we try to insert it. 979 */ 980 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 981 if (!error) 982 target->ia_flags |= IFA_ROUTE; 983 return (error); 984 } 985 986 /* 987 * If there is no other address in the system that can serve a route to the 988 * same prefix, remove the route. Hand over the route to the new address 989 * otherwise. 990 */ 991 int 992 in_scrubprefix(struct in_ifaddr *target, u_int flags) 993 { 994 struct in_ifaddr *ia; 995 struct in_addr prefix, mask, p, m; 996 int error = 0; 997 struct sockaddr_in prefix0, mask0; 998 999 /* 1000 * Remove the loopback route to the interface address. 1001 * The "useloopback" setting is not consulted because if the 1002 * user configures an interface address, turns off this 1003 * setting, and then tries to delete that interface address, 1004 * checking the current setting of "useloopback" would leave 1005 * that interface address loopback route untouched, which 1006 * would be wrong. Therefore the interface address loopback route 1007 * deletion is unconditional. 1008 */ 1009 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) && 1010 !(target->ia_ifp->if_flags & IFF_LOOPBACK) && 1011 (target->ia_flags & IFA_RTSELF)) { 1012 struct route ia_ro; 1013 int freeit = 0; 1014 int fib; 1015 1016 bzero(&ia_ro, sizeof(ia_ro)); 1017 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = target->ia_addr; 1018 fib = target->ia_ifa.ifa_ifp->if_fib; 1019 rtalloc_ign_fib(&ia_ro, 0, fib); 1020 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) && 1021 (ia_ro.ro_rt->rt_ifp == V_loif)) { 1022 RT_LOCK(ia_ro.ro_rt); 1023 if (ia_ro.ro_rt->rt_refcnt <= 1) 1024 freeit = 1; 1025 else if (flags & LLE_STATIC) { 1026 RT_REMREF(ia_ro.ro_rt); 1027 target->ia_flags &= ~IFA_RTSELF; 1028 } 1029 RTFREE_LOCKED(ia_ro.ro_rt); 1030 } 1031 if (freeit && (flags & LLE_STATIC)) { 1032 error = ifa_del_loopback_route((struct ifaddr *)target, 1033 (struct sockaddr *)&target->ia_addr); 1034 if (error == 0) 1035 target->ia_flags &= ~IFA_RTSELF; 1036 } 1037 if ((flags & LLE_STATIC) && 1038 !(target->ia_ifp->if_flags & IFF_NOARP)) 1039 /* remove arp cache */ 1040 arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr); 1041 } 1042 1043 if (rtinitflags(target)) { 1044 prefix = target->ia_dstaddr.sin_addr; 1045 mask.s_addr = 0; 1046 } else { 1047 prefix = target->ia_addr.sin_addr; 1048 mask = target->ia_sockmask.sin_addr; 1049 prefix.s_addr &= mask.s_addr; 1050 } 1051 1052 if ((target->ia_flags & IFA_ROUTE) == 0) { 1053 int fibnum; 1054 1055 fibnum = rt_add_addr_allfibs ? RT_ALL_FIBS : 1056 target->ia_ifp->if_fib; 1057 rt_addrmsg(RTM_DELETE, &target->ia_ifa, fibnum); 1058 return (0); 1059 } 1060 1061 IN_IFADDR_RLOCK(); 1062 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1063 if (rtinitflags(ia)) { 1064 p = ia->ia_dstaddr.sin_addr; 1065 1066 if (prefix.s_addr != p.s_addr) 1067 continue; 1068 } else { 1069 p = ia->ia_addr.sin_addr; 1070 m = ia->ia_sockmask.sin_addr; 1071 p.s_addr &= m.s_addr; 1072 1073 if (prefix.s_addr != p.s_addr || 1074 mask.s_addr != m.s_addr) 1075 continue; 1076 } 1077 1078 if ((ia->ia_ifp->if_flags & IFF_UP) == 0) 1079 continue; 1080 1081 /* 1082 * If we got a matching prefix address, move IFA_ROUTE and 1083 * the route itself to it. Make sure that routing daemons 1084 * get a heads-up. 1085 */ 1086 if ((ia->ia_flags & IFA_ROUTE) == 0) { 1087 ifa_ref(&ia->ia_ifa); 1088 IN_IFADDR_RUNLOCK(); 1089 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, 1090 rtinitflags(target)); 1091 if (error == 0) 1092 target->ia_flags &= ~IFA_ROUTE; 1093 else 1094 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n", 1095 error); 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 else 1101 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n", 1102 error); 1103 ifa_free(&ia->ia_ifa); 1104 return (error); 1105 } 1106 } 1107 IN_IFADDR_RUNLOCK(); 1108 1109 /* 1110 * remove all L2 entries on the given prefix 1111 */ 1112 bzero(&prefix0, sizeof(prefix0)); 1113 prefix0.sin_len = sizeof(prefix0); 1114 prefix0.sin_family = AF_INET; 1115 prefix0.sin_addr.s_addr = target->ia_subnet; 1116 bzero(&mask0, sizeof(mask0)); 1117 mask0.sin_len = sizeof(mask0); 1118 mask0.sin_family = AF_INET; 1119 mask0.sin_addr.s_addr = target->ia_subnetmask; 1120 lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0, 1121 (struct sockaddr *)&mask0, flags); 1122 1123 /* 1124 * As no-one seem to have this prefix, we can remove the route. 1125 */ 1126 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 1127 if (error == 0) 1128 target->ia_flags &= ~IFA_ROUTE; 1129 else 1130 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error); 1131 return (error); 1132 } 1133 1134 #undef rtinitflags 1135 1136 /* 1137 * Return 1 if the address might be a local broadcast address. 1138 */ 1139 int 1140 in_broadcast(struct in_addr in, struct ifnet *ifp) 1141 { 1142 register struct ifaddr *ifa; 1143 u_long t; 1144 1145 if (in.s_addr == INADDR_BROADCAST || 1146 in.s_addr == INADDR_ANY) 1147 return (1); 1148 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1149 return (0); 1150 t = ntohl(in.s_addr); 1151 /* 1152 * Look through the list of addresses for a match 1153 * with a broadcast address. 1154 */ 1155 #define ia ((struct in_ifaddr *)ifa) 1156 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1157 if (ifa->ifa_addr->sa_family == AF_INET && 1158 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1159 /* 1160 * Check for old-style (host 0) broadcast, but 1161 * taking into account that RFC 3021 obsoletes it. 1162 */ 1163 (ia->ia_subnetmask != IN_RFC3021_MASK && 1164 t == ia->ia_subnet)) && 1165 /* 1166 * Check for an all one subnetmask. These 1167 * only exist when an interface gets a secondary 1168 * address. 1169 */ 1170 ia->ia_subnetmask != (u_long)0xffffffff) 1171 return (1); 1172 return (0); 1173 #undef ia 1174 } 1175 1176 /* 1177 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 1178 */ 1179 void 1180 in_ifdetach(struct ifnet *ifp) 1181 { 1182 1183 in_pcbpurgeif0(&V_ripcbinfo, ifp); 1184 in_pcbpurgeif0(&V_udbinfo, ifp); 1185 in_pcbpurgeif0(&V_ulitecbinfo, ifp); 1186 in_purgemaddrs(ifp); 1187 } 1188 1189 /* 1190 * Delete all IPv4 multicast address records, and associated link-layer 1191 * multicast address records, associated with ifp. 1192 * XXX It looks like domifdetach runs AFTER the link layer cleanup. 1193 * XXX This should not race with ifma_protospec being set during 1194 * a new allocation, if it does, we have bigger problems. 1195 */ 1196 static void 1197 in_purgemaddrs(struct ifnet *ifp) 1198 { 1199 LIST_HEAD(,in_multi) purgeinms; 1200 struct in_multi *inm, *tinm; 1201 struct ifmultiaddr *ifma; 1202 1203 LIST_INIT(&purgeinms); 1204 IN_MULTI_LOCK(); 1205 1206 /* 1207 * Extract list of in_multi associated with the detaching ifp 1208 * which the PF_INET layer is about to release. 1209 * We need to do this as IF_ADDR_LOCK() may be re-acquired 1210 * by code further down. 1211 */ 1212 IF_ADDR_RLOCK(ifp); 1213 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1214 if (ifma->ifma_addr->sa_family != AF_INET || 1215 ifma->ifma_protospec == NULL) 1216 continue; 1217 #if 0 1218 KASSERT(ifma->ifma_protospec != NULL, 1219 ("%s: ifma_protospec is NULL", __func__)); 1220 #endif 1221 inm = (struct in_multi *)ifma->ifma_protospec; 1222 LIST_INSERT_HEAD(&purgeinms, inm, inm_link); 1223 } 1224 IF_ADDR_RUNLOCK(ifp); 1225 1226 LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) { 1227 LIST_REMOVE(inm, inm_link); 1228 inm_release_locked(inm); 1229 } 1230 igmp_ifdetach(ifp); 1231 1232 IN_MULTI_UNLOCK(); 1233 } 1234 1235 struct in_llentry { 1236 struct llentry base; 1237 struct sockaddr_in l3_addr4; 1238 }; 1239 1240 /* 1241 * Deletes an address from the address table. 1242 * This function is called by the timer functions 1243 * such as arptimer() and nd6_llinfo_timer(), and 1244 * the caller does the locking. 1245 */ 1246 static void 1247 in_lltable_free(struct lltable *llt, struct llentry *lle) 1248 { 1249 LLE_WUNLOCK(lle); 1250 LLE_LOCK_DESTROY(lle); 1251 free(lle, M_LLTABLE); 1252 } 1253 1254 static struct llentry * 1255 in_lltable_new(const struct sockaddr *l3addr, u_int flags) 1256 { 1257 struct in_llentry *lle; 1258 1259 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 1260 if (lle == NULL) /* NB: caller generates msg */ 1261 return NULL; 1262 1263 /* 1264 * For IPv4 this will trigger "arpresolve" to generate 1265 * an ARP request. 1266 */ 1267 lle->base.la_expire = time_uptime; /* mark expired */ 1268 lle->l3_addr4 = *(const struct sockaddr_in *)l3addr; 1269 lle->base.lle_refcnt = 1; 1270 lle->base.lle_free = in_lltable_free; 1271 LLE_LOCK_INIT(&lle->base); 1272 callout_init(&lle->base.la_timer, 1); 1273 1274 return (&lle->base); 1275 } 1276 1277 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 1278 (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 ) 1279 1280 static void 1281 in_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix, 1282 const struct sockaddr *mask, u_int flags) 1283 { 1284 const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix; 1285 const struct sockaddr_in *msk = (const struct sockaddr_in *)mask; 1286 struct llentry *lle, *next; 1287 int i; 1288 size_t pkts_dropped; 1289 1290 IF_AFDATA_WLOCK(llt->llt_ifp); 1291 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1292 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 1293 /* 1294 * (flags & LLE_STATIC) means deleting all entries 1295 * including static ARP entries. 1296 */ 1297 if (IN_ARE_MASKED_ADDR_EQUAL(satosin(L3_ADDR(lle)), 1298 pfx, msk) && ((flags & LLE_STATIC) || 1299 !(lle->la_flags & LLE_STATIC))) { 1300 LLE_WLOCK(lle); 1301 if (callout_stop(&lle->la_timer)) 1302 LLE_REMREF(lle); 1303 pkts_dropped = llentry_free(lle); 1304 ARPSTAT_ADD(dropped, pkts_dropped); 1305 } 1306 } 1307 } 1308 IF_AFDATA_WUNLOCK(llt->llt_ifp); 1309 } 1310 1311 1312 static int 1313 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr) 1314 { 1315 struct rtentry *rt; 1316 1317 KASSERT(l3addr->sa_family == AF_INET, 1318 ("sin_family %d", l3addr->sa_family)); 1319 1320 /* XXX rtalloc1_fib should take a const param */ 1321 rt = rtalloc1_fib(__DECONST(struct sockaddr *, l3addr), 0, 0, 1322 ifp->if_fib); 1323 1324 if (rt == NULL) 1325 return (EINVAL); 1326 1327 /* 1328 * If the gateway for an existing host route matches the target L3 1329 * address, which is a special route inserted by some implementation 1330 * such as MANET, and the interface is of the correct type, then 1331 * allow for ARP to proceed. 1332 */ 1333 if (rt->rt_flags & RTF_GATEWAY) { 1334 if (!(rt->rt_flags & RTF_HOST) || !rt->rt_ifp || 1335 rt->rt_ifp->if_type != IFT_ETHER || 1336 (rt->rt_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 || 1337 memcmp(rt->rt_gateway->sa_data, l3addr->sa_data, 1338 sizeof(in_addr_t)) != 0) { 1339 RTFREE_LOCKED(rt); 1340 return (EINVAL); 1341 } 1342 } 1343 1344 /* 1345 * Make sure that at least the destination address is covered 1346 * by the route. This is for handling the case where 2 or more 1347 * interfaces have the same prefix. An incoming packet arrives 1348 * on one interface and the corresponding outgoing packet leaves 1349 * another interface. 1350 */ 1351 if (!(rt->rt_flags & RTF_HOST) && rt->rt_ifp != ifp) { 1352 const char *sa, *mask, *addr, *lim; 1353 int len; 1354 1355 mask = (const char *)rt_mask(rt); 1356 /* 1357 * Just being extra cautious to avoid some custom 1358 * code getting into trouble. 1359 */ 1360 if (mask == NULL) { 1361 RTFREE_LOCKED(rt); 1362 return (EINVAL); 1363 } 1364 1365 sa = (const char *)rt_key(rt); 1366 addr = (const char *)l3addr; 1367 len = ((const struct sockaddr_in *)l3addr)->sin_len; 1368 lim = addr + len; 1369 1370 for ( ; addr < lim; sa++, mask++, addr++) { 1371 if ((*sa ^ *addr) & *mask) { 1372 #ifdef DIAGNOSTIC 1373 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n", 1374 inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr)); 1375 #endif 1376 RTFREE_LOCKED(rt); 1377 return (EINVAL); 1378 } 1379 } 1380 } 1381 1382 RTFREE_LOCKED(rt); 1383 return (0); 1384 } 1385 1386 /* 1387 * Return NULL if not found or marked for deletion. 1388 * If found return lle read locked. 1389 */ 1390 static struct llentry * 1391 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1392 { 1393 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1394 struct ifnet *ifp = llt->llt_ifp; 1395 struct llentry *lle; 1396 struct llentries *lleh; 1397 u_int hashkey; 1398 1399 IF_AFDATA_LOCK_ASSERT(ifp); 1400 KASSERT(l3addr->sa_family == AF_INET, 1401 ("sin_family %d", l3addr->sa_family)); 1402 1403 hashkey = sin->sin_addr.s_addr; 1404 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 1405 LIST_FOREACH(lle, lleh, lle_next) { 1406 struct sockaddr_in *sa2 = satosin(L3_ADDR(lle)); 1407 if (lle->la_flags & LLE_DELETED) 1408 continue; 1409 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr) 1410 break; 1411 } 1412 if (lle == NULL) { 1413 #ifdef DIAGNOSTIC 1414 if (flags & LLE_DELETE) 1415 log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle); 1416 #endif 1417 if (!(flags & LLE_CREATE)) 1418 return (NULL); 1419 IF_AFDATA_WLOCK_ASSERT(ifp); 1420 /* 1421 * A route that covers the given address must have 1422 * been installed 1st because we are doing a resolution, 1423 * verify this. 1424 */ 1425 if (!(flags & LLE_IFADDR) && 1426 in_lltable_rtcheck(ifp, flags, l3addr) != 0) 1427 goto done; 1428 1429 lle = in_lltable_new(l3addr, flags); 1430 if (lle == NULL) { 1431 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 1432 goto done; 1433 } 1434 lle->la_flags = flags & ~LLE_CREATE; 1435 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 1436 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 1437 lle->la_flags |= (LLE_VALID | LLE_STATIC); 1438 } 1439 1440 lle->lle_tbl = llt; 1441 lle->lle_head = lleh; 1442 lle->la_flags |= LLE_LINKED; 1443 LIST_INSERT_HEAD(lleh, lle, lle_next); 1444 } else if (flags & LLE_DELETE) { 1445 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 1446 LLE_WLOCK(lle); 1447 lle->la_flags |= LLE_DELETED; 1448 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 1449 #ifdef DIAGNOSTIC 1450 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 1451 #endif 1452 if ((lle->la_flags & 1453 (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC) 1454 llentry_free(lle); 1455 else 1456 LLE_WUNLOCK(lle); 1457 } 1458 lle = (void *)-1; 1459 1460 } 1461 if (LLE_IS_VALID(lle)) { 1462 if (flags & LLE_EXCLUSIVE) 1463 LLE_WLOCK(lle); 1464 else 1465 LLE_RLOCK(lle); 1466 } 1467 done: 1468 return (lle); 1469 } 1470 1471 static int 1472 in_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 1473 { 1474 #define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle)) 1475 struct ifnet *ifp = llt->llt_ifp; 1476 struct llentry *lle; 1477 /* XXX stack use */ 1478 struct { 1479 struct rt_msghdr rtm; 1480 struct sockaddr_in sin; 1481 struct sockaddr_dl sdl; 1482 } arpc; 1483 int error, i; 1484 1485 LLTABLE_LOCK_ASSERT(); 1486 1487 error = 0; 1488 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1489 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 1490 struct sockaddr_dl *sdl; 1491 1492 /* skip deleted entries */ 1493 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 1494 continue; 1495 /* Skip if jailed and not a valid IP of the prison. */ 1496 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 1497 continue; 1498 /* 1499 * produce a msg made of: 1500 * struct rt_msghdr; 1501 * struct sockaddr_in; (IPv4) 1502 * struct sockaddr_dl; 1503 */ 1504 bzero(&arpc, sizeof(arpc)); 1505 arpc.rtm.rtm_msglen = sizeof(arpc); 1506 arpc.rtm.rtm_version = RTM_VERSION; 1507 arpc.rtm.rtm_type = RTM_GET; 1508 arpc.rtm.rtm_flags = RTF_UP; 1509 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1510 arpc.sin.sin_family = AF_INET; 1511 arpc.sin.sin_len = sizeof(arpc.sin); 1512 arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr; 1513 1514 /* publish */ 1515 if (lle->la_flags & LLE_PUB) 1516 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1517 1518 sdl = &arpc.sdl; 1519 sdl->sdl_family = AF_LINK; 1520 sdl->sdl_len = sizeof(*sdl); 1521 sdl->sdl_index = ifp->if_index; 1522 sdl->sdl_type = ifp->if_type; 1523 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 1524 sdl->sdl_alen = ifp->if_addrlen; 1525 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1526 } else { 1527 sdl->sdl_alen = 0; 1528 bzero(LLADDR(sdl), ifp->if_addrlen); 1529 } 1530 1531 arpc.rtm.rtm_rmx.rmx_expire = 1532 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1533 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1534 if (lle->la_flags & LLE_STATIC) 1535 arpc.rtm.rtm_flags |= RTF_STATIC; 1536 arpc.rtm.rtm_index = ifp->if_index; 1537 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1538 if (error) 1539 break; 1540 } 1541 } 1542 return error; 1543 #undef SIN 1544 } 1545 1546 void * 1547 in_domifattach(struct ifnet *ifp) 1548 { 1549 struct in_ifinfo *ii; 1550 struct lltable *llt; 1551 1552 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); 1553 1554 llt = lltable_init(ifp, AF_INET); 1555 if (llt != NULL) { 1556 llt->llt_prefix_free = in_lltable_prefix_free; 1557 llt->llt_lookup = in_lltable_lookup; 1558 llt->llt_dump = in_lltable_dump; 1559 } 1560 ii->ii_llt = llt; 1561 1562 ii->ii_igmp = igmp_domifattach(ifp); 1563 1564 return ii; 1565 } 1566 1567 void 1568 in_domifdetach(struct ifnet *ifp, void *aux) 1569 { 1570 struct in_ifinfo *ii = (struct in_ifinfo *)aux; 1571 1572 igmp_domifdetach(ifp); 1573 lltable_free(ii->ii_llt); 1574 free(ii, M_IFADDR); 1575 }
Cache object: 3fa716946f1fcf1e8fb7761cd33c6932
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