1 /*- 2 * Copyright (c) 1982, 1986, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (C) 2001 WIDE Project. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 4. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * @(#)in.c 8.4 (Berkeley) 1/9/95 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include "opt_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_dl.h> 53 #include <net/if_llatbl.h> 54 #include <net/if_types.h> 55 #include <net/route.h> 56 #include <net/vnet.h> 57 58 #include <netinet/in.h> 59 #include <netinet/in_var.h> 60 #include <netinet/in_pcb.h> 61 #include <netinet/ip_var.h> 62 #include <netinet/igmp_var.h> 63 #include <netinet/udp.h> 64 #include <netinet/udp_var.h> 65 66 static int in_mask2len(struct in_addr *); 67 static void in_len2mask(struct in_addr *, int); 68 static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t, 69 struct ifnet *, struct thread *); 70 71 static int in_addprefix(struct in_ifaddr *, int); 72 static int in_scrubprefix(struct in_ifaddr *); 73 static void in_socktrim(struct sockaddr_in *); 74 static int in_ifinit(struct ifnet *, 75 struct in_ifaddr *, struct sockaddr_in *, int); 76 static void in_purgemaddrs(struct ifnet *); 77 78 static VNET_DEFINE(int, subnetsarelocal); 79 #define V_subnetsarelocal VNET(subnetsarelocal) 80 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 81 &VNET_NAME(subnetsarelocal), 0, 82 "Treat all subnets as directly connected"); 83 static VNET_DEFINE(int, sameprefixcarponly); 84 #define V_sameprefixcarponly VNET(sameprefixcarponly) 85 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, same_prefix_carp_only, CTLFLAG_RW, 86 &VNET_NAME(sameprefixcarponly), 0, 87 "Refuse to create same prefixes on different interfaces"); 88 89 VNET_DECLARE(struct inpcbinfo, ripcbinfo); 90 #define V_ripcbinfo VNET(ripcbinfo) 91 92 /* 93 * Return 1 if an internet address is for a ``local'' host 94 * (one to which we have a connection). If subnetsarelocal 95 * is true, this includes other subnets of the local net. 96 * Otherwise, it includes only the directly-connected (sub)nets. 97 */ 98 int 99 in_localaddr(struct in_addr in) 100 { 101 register u_long i = ntohl(in.s_addr); 102 register struct in_ifaddr *ia; 103 104 IN_IFADDR_RLOCK(); 105 if (V_subnetsarelocal) { 106 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 107 if ((i & ia->ia_netmask) == ia->ia_net) { 108 IN_IFADDR_RUNLOCK(); 109 return (1); 110 } 111 } 112 } else { 113 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 114 if ((i & ia->ia_subnetmask) == ia->ia_subnet) { 115 IN_IFADDR_RUNLOCK(); 116 return (1); 117 } 118 } 119 } 120 IN_IFADDR_RUNLOCK(); 121 return (0); 122 } 123 124 /* 125 * Return 1 if an internet address is for the local host and configured 126 * on one of its interfaces. 127 */ 128 int 129 in_localip(struct in_addr in) 130 { 131 struct in_ifaddr *ia; 132 133 IN_IFADDR_RLOCK(); 134 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) { 135 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) { 136 IN_IFADDR_RUNLOCK(); 137 return (1); 138 } 139 } 140 IN_IFADDR_RUNLOCK(); 141 return (0); 142 } 143 144 /* 145 * Determine whether an IP address is in a reserved set of addresses 146 * that may not be forwarded, or whether datagrams to that destination 147 * may be forwarded. 148 */ 149 int 150 in_canforward(struct in_addr in) 151 { 152 register u_long i = ntohl(in.s_addr); 153 register u_long net; 154 155 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i)) 156 return (0); 157 if (IN_CLASSA(i)) { 158 net = i & IN_CLASSA_NET; 159 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT)) 160 return (0); 161 } 162 return (1); 163 } 164 165 /* 166 * Trim a mask in a sockaddr 167 */ 168 static void 169 in_socktrim(struct sockaddr_in *ap) 170 { 171 register char *cplim = (char *) &ap->sin_addr; 172 register char *cp = (char *) (&ap->sin_addr + 1); 173 174 ap->sin_len = 0; 175 while (--cp >= cplim) 176 if (*cp) { 177 (ap)->sin_len = cp - (char *) (ap) + 1; 178 break; 179 } 180 } 181 182 static int 183 in_mask2len(mask) 184 struct in_addr *mask; 185 { 186 int x, y; 187 u_char *p; 188 189 p = (u_char *)mask; 190 for (x = 0; x < sizeof(*mask); x++) { 191 if (p[x] != 0xff) 192 break; 193 } 194 y = 0; 195 if (x < sizeof(*mask)) { 196 for (y = 0; y < 8; y++) { 197 if ((p[x] & (0x80 >> y)) == 0) 198 break; 199 } 200 } 201 return (x * 8 + y); 202 } 203 204 static void 205 in_len2mask(struct in_addr *mask, int len) 206 { 207 int i; 208 u_char *p; 209 210 p = (u_char *)mask; 211 bzero(mask, sizeof(*mask)); 212 for (i = 0; i < len / 8; i++) 213 p[i] = 0xff; 214 if (len % 8) 215 p[i] = (0xff00 >> (len % 8)) & 0xff; 216 } 217 218 /* 219 * Generic internet control operations (ioctl's). 220 * 221 * ifp is NULL if not an interface-specific ioctl. 222 */ 223 /* ARGSUSED */ 224 int 225 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 226 struct thread *td) 227 { 228 register struct ifreq *ifr = (struct ifreq *)data; 229 register struct in_ifaddr *ia, *iap; 230 register struct ifaddr *ifa; 231 struct in_addr allhosts_addr; 232 struct in_addr dst; 233 struct in_ifinfo *ii; 234 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 235 struct sockaddr_in oldaddr; 236 int error, hostIsNew, iaIsNew, maskIsNew; 237 int iaIsFirst; 238 239 ia = NULL; 240 iaIsFirst = 0; 241 iaIsNew = 0; 242 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 243 244 /* 245 * Filter out ioctls we implement directly; forward the rest on to 246 * in_lifaddr_ioctl() and ifp->if_ioctl(). 247 */ 248 switch (cmd) { 249 case SIOCAIFADDR: 250 case SIOCDIFADDR: 251 case SIOCGIFADDR: 252 case SIOCGIFBRDADDR: 253 case SIOCGIFDSTADDR: 254 case SIOCGIFNETMASK: 255 case SIOCSIFADDR: 256 case SIOCSIFBRDADDR: 257 case SIOCSIFDSTADDR: 258 case SIOCSIFNETMASK: 259 break; 260 261 case SIOCALIFADDR: 262 if (td != NULL) { 263 error = priv_check(td, PRIV_NET_ADDIFADDR); 264 if (error) 265 return (error); 266 } 267 if (ifp == NULL) 268 return (EINVAL); 269 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 270 271 case SIOCDLIFADDR: 272 if (td != NULL) { 273 error = priv_check(td, PRIV_NET_DELIFADDR); 274 if (error) 275 return (error); 276 } 277 if (ifp == NULL) 278 return (EINVAL); 279 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 280 281 case SIOCGLIFADDR: 282 if (ifp == NULL) 283 return (EINVAL); 284 return in_lifaddr_ioctl(so, cmd, data, ifp, td); 285 286 default: 287 if (ifp == NULL || ifp->if_ioctl == NULL) 288 return (EOPNOTSUPP); 289 return ((*ifp->if_ioctl)(ifp, cmd, data)); 290 } 291 292 if (ifp == NULL) 293 return (EADDRNOTAVAIL); 294 295 /* 296 * Security checks before we get involved in any work. 297 */ 298 switch (cmd) { 299 case SIOCAIFADDR: 300 case SIOCSIFADDR: 301 case SIOCSIFBRDADDR: 302 case SIOCSIFNETMASK: 303 case SIOCSIFDSTADDR: 304 if (td != NULL) { 305 error = priv_check(td, PRIV_NET_ADDIFADDR); 306 if (error) 307 return (error); 308 } 309 break; 310 311 case SIOCDIFADDR: 312 if (td != NULL) { 313 error = priv_check(td, PRIV_NET_DELIFADDR); 314 if (error) 315 return (error); 316 } 317 break; 318 } 319 320 /* 321 * Find address for this interface, if it exists. 322 * 323 * If an alias address was specified, find that one instead of the 324 * first one on the interface, if possible. 325 */ 326 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 327 IN_IFADDR_RLOCK(); 328 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) { 329 if (iap->ia_ifp == ifp && 330 iap->ia_addr.sin_addr.s_addr == dst.s_addr) { 331 if (td == NULL || prison_check_ip4(td->td_ucred, 332 &dst) == 0) 333 ia = iap; 334 break; 335 } 336 } 337 if (ia != NULL) 338 ifa_ref(&ia->ia_ifa); 339 IN_IFADDR_RUNLOCK(); 340 if (ia == NULL) { 341 IF_ADDR_LOCK(ifp); 342 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 343 iap = ifatoia(ifa); 344 if (iap->ia_addr.sin_family == AF_INET) { 345 if (td != NULL && 346 prison_check_ip4(td->td_ucred, 347 &iap->ia_addr.sin_addr) != 0) 348 continue; 349 ia = iap; 350 break; 351 } 352 } 353 if (ia != NULL) 354 ifa_ref(&ia->ia_ifa); 355 IF_ADDR_UNLOCK(ifp); 356 } 357 if (ia == NULL) 358 iaIsFirst = 1; 359 360 error = 0; 361 switch (cmd) { 362 case SIOCAIFADDR: 363 case SIOCDIFADDR: 364 if (ifra->ifra_addr.sin_family == AF_INET) { 365 struct in_ifaddr *oia; 366 367 IN_IFADDR_RLOCK(); 368 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) { 369 if (ia->ia_ifp == ifp && 370 ia->ia_addr.sin_addr.s_addr == 371 ifra->ifra_addr.sin_addr.s_addr) 372 break; 373 } 374 if (ia != NULL && ia != oia) 375 ifa_ref(&ia->ia_ifa); 376 if (oia != NULL && ia != oia) 377 ifa_free(&oia->ia_ifa); 378 IN_IFADDR_RUNLOCK(); 379 if ((ifp->if_flags & IFF_POINTOPOINT) 380 && (cmd == SIOCAIFADDR) 381 && (ifra->ifra_dstaddr.sin_addr.s_addr 382 == INADDR_ANY)) { 383 error = EDESTADDRREQ; 384 goto out; 385 } 386 } 387 if (cmd == SIOCDIFADDR && ia == NULL) { 388 error = EADDRNOTAVAIL; 389 goto out; 390 } 391 /* FALLTHROUGH */ 392 case SIOCSIFADDR: 393 case SIOCSIFNETMASK: 394 case SIOCSIFDSTADDR: 395 if (ia == NULL) { 396 ia = (struct in_ifaddr *) 397 malloc(sizeof *ia, M_IFADDR, M_NOWAIT | 398 M_ZERO); 399 if (ia == NULL) { 400 error = ENOBUFS; 401 goto out; 402 } 403 404 ifa = &ia->ia_ifa; 405 ifa_init(ifa); 406 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 407 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 408 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 409 410 ia->ia_sockmask.sin_len = 8; 411 ia->ia_sockmask.sin_family = AF_INET; 412 if (ifp->if_flags & IFF_BROADCAST) { 413 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr); 414 ia->ia_broadaddr.sin_family = AF_INET; 415 } 416 ia->ia_ifp = ifp; 417 418 ifa_ref(ifa); /* if_addrhead */ 419 IF_ADDR_LOCK(ifp); 420 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 421 IF_ADDR_UNLOCK(ifp); 422 ifa_ref(ifa); /* in_ifaddrhead */ 423 IN_IFADDR_WLOCK(); 424 TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link); 425 IN_IFADDR_WUNLOCK(); 426 iaIsNew = 1; 427 } 428 break; 429 430 case SIOCSIFBRDADDR: 431 case SIOCGIFADDR: 432 case SIOCGIFNETMASK: 433 case SIOCGIFDSTADDR: 434 case SIOCGIFBRDADDR: 435 if (ia == NULL) { 436 error = EADDRNOTAVAIL; 437 goto out; 438 } 439 break; 440 } 441 442 /* 443 * Most paths in this switch return directly or via out. Only paths 444 * that remove the address break in order to hit common removal code. 445 */ 446 switch (cmd) { 447 case SIOCGIFADDR: 448 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr; 449 goto out; 450 451 case SIOCGIFBRDADDR: 452 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 453 error = EINVAL; 454 goto out; 455 } 456 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr; 457 goto out; 458 459 case SIOCGIFDSTADDR: 460 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 461 error = EINVAL; 462 goto out; 463 } 464 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr; 465 goto out; 466 467 case SIOCGIFNETMASK: 468 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask; 469 goto out; 470 471 case SIOCSIFDSTADDR: 472 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 473 error = EINVAL; 474 goto out; 475 } 476 oldaddr = ia->ia_dstaddr; 477 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr; 478 if (ifp->if_ioctl != NULL) { 479 error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, 480 (caddr_t)ia); 481 if (error) { 482 ia->ia_dstaddr = oldaddr; 483 goto out; 484 } 485 } 486 if (ia->ia_flags & IFA_ROUTE) { 487 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr; 488 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST); 489 ia->ia_ifa.ifa_dstaddr = 490 (struct sockaddr *)&ia->ia_dstaddr; 491 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP); 492 } 493 goto out; 494 495 case SIOCSIFBRDADDR: 496 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 497 error = EINVAL; 498 goto out; 499 } 500 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr; 501 goto out; 502 503 case SIOCSIFADDR: 504 error = in_ifinit(ifp, ia, 505 (struct sockaddr_in *) &ifr->ifr_addr, 1); 506 if (error != 0 && iaIsNew) 507 break; 508 if (error == 0) { 509 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 510 if (iaIsFirst && 511 (ifp->if_flags & IFF_MULTICAST) != 0) { 512 error = in_joingroup(ifp, &allhosts_addr, 513 NULL, &ii->ii_allhosts); 514 } 515 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 516 } 517 error = 0; 518 goto out; 519 520 case SIOCSIFNETMASK: 521 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr; 522 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 523 goto out; 524 525 case SIOCAIFADDR: 526 maskIsNew = 0; 527 hostIsNew = 1; 528 error = 0; 529 if (ia->ia_addr.sin_family == AF_INET) { 530 if (ifra->ifra_addr.sin_len == 0) { 531 ifra->ifra_addr = ia->ia_addr; 532 hostIsNew = 0; 533 } else if (ifra->ifra_addr.sin_addr.s_addr == 534 ia->ia_addr.sin_addr.s_addr) 535 hostIsNew = 0; 536 } 537 if (ifra->ifra_mask.sin_len) { 538 /* 539 * QL: XXX 540 * Need to scrub the prefix here in case 541 * the issued command is SIOCAIFADDR with 542 * the same address, but with a different 543 * prefix length. And if the prefix length 544 * is the same as before, then the call is 545 * un-necessarily executed here. 546 */ 547 in_ifscrub(ifp, ia); 548 ia->ia_sockmask = ifra->ifra_mask; 549 ia->ia_sockmask.sin_family = AF_INET; 550 ia->ia_subnetmask = 551 ntohl(ia->ia_sockmask.sin_addr.s_addr); 552 maskIsNew = 1; 553 } 554 if ((ifp->if_flags & IFF_POINTOPOINT) && 555 (ifra->ifra_dstaddr.sin_family == AF_INET)) { 556 in_ifscrub(ifp, ia); 557 ia->ia_dstaddr = ifra->ifra_dstaddr; 558 maskIsNew = 1; /* We lie; but the effect's the same */ 559 } 560 if (ifra->ifra_addr.sin_family == AF_INET && 561 (hostIsNew || maskIsNew)) 562 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0); 563 if (error != 0 && iaIsNew) 564 break; 565 566 if ((ifp->if_flags & IFF_BROADCAST) && 567 (ifra->ifra_broadaddr.sin_family == AF_INET)) 568 ia->ia_broadaddr = ifra->ifra_broadaddr; 569 if (error == 0) { 570 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 571 if (iaIsFirst && 572 (ifp->if_flags & IFF_MULTICAST) != 0) { 573 error = in_joingroup(ifp, &allhosts_addr, 574 NULL, &ii->ii_allhosts); 575 } 576 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 577 } 578 goto out; 579 580 case SIOCDIFADDR: 581 /* 582 * in_ifscrub kills the interface route. 583 */ 584 in_ifscrub(ifp, ia); 585 586 /* 587 * in_ifadown gets rid of all the rest of 588 * the routes. This is not quite the right 589 * thing to do, but at least if we are running 590 * a routing process they will come back. 591 */ 592 in_ifadown(&ia->ia_ifa, 1); 593 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 594 error = 0; 595 break; 596 597 default: 598 panic("in_control: unsupported ioctl"); 599 } 600 601 IF_ADDR_LOCK(ifp); 602 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 603 IF_ADDR_UNLOCK(ifp); 604 ifa_free(&ia->ia_ifa); /* if_addrhead */ 605 606 IN_IFADDR_WLOCK(); 607 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link); 608 if (ia->ia_addr.sin_family == AF_INET) { 609 struct in_ifaddr *if_ia; 610 611 LIST_REMOVE(ia, ia_hash); 612 IN_IFADDR_WUNLOCK(); 613 /* 614 * If this is the last IPv4 address configured on this 615 * interface, leave the all-hosts group. 616 * No state-change report need be transmitted. 617 */ 618 if_ia = NULL; 619 IFP_TO_IA(ifp, if_ia); 620 if (if_ia == NULL) { 621 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 622 IN_MULTI_LOCK(); 623 if (ii->ii_allhosts) { 624 (void)in_leavegroup_locked(ii->ii_allhosts, 625 NULL); 626 ii->ii_allhosts = NULL; 627 } 628 IN_MULTI_UNLOCK(); 629 } else 630 ifa_free(&if_ia->ia_ifa); 631 } else 632 IN_IFADDR_WUNLOCK(); 633 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 634 out: 635 if (ia != NULL) 636 ifa_free(&ia->ia_ifa); 637 return (error); 638 } 639 640 /* 641 * SIOC[GAD]LIFADDR. 642 * SIOCGLIFADDR: get first address. (?!?) 643 * SIOCGLIFADDR with IFLR_PREFIX: 644 * get first address that matches the specified prefix. 645 * SIOCALIFADDR: add the specified address. 646 * SIOCALIFADDR with IFLR_PREFIX: 647 * EINVAL since we can't deduce hostid part of the address. 648 * SIOCDLIFADDR: delete the specified address. 649 * SIOCDLIFADDR with IFLR_PREFIX: 650 * delete the first address that matches the specified prefix. 651 * return values: 652 * EINVAL on invalid parameters 653 * EADDRNOTAVAIL on prefix match failed/specified address not found 654 * other values may be returned from in_ioctl() 655 */ 656 static int 657 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 658 struct ifnet *ifp, struct thread *td) 659 { 660 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 661 struct ifaddr *ifa; 662 663 /* sanity checks */ 664 if (data == NULL || ifp == NULL) { 665 panic("invalid argument to in_lifaddr_ioctl"); 666 /*NOTRECHED*/ 667 } 668 669 switch (cmd) { 670 case SIOCGLIFADDR: 671 /* address must be specified on GET with IFLR_PREFIX */ 672 if ((iflr->flags & IFLR_PREFIX) == 0) 673 break; 674 /*FALLTHROUGH*/ 675 case SIOCALIFADDR: 676 case SIOCDLIFADDR: 677 /* address must be specified on ADD and DELETE */ 678 if (iflr->addr.ss_family != AF_INET) 679 return (EINVAL); 680 if (iflr->addr.ss_len != sizeof(struct sockaddr_in)) 681 return (EINVAL); 682 /* XXX need improvement */ 683 if (iflr->dstaddr.ss_family 684 && iflr->dstaddr.ss_family != AF_INET) 685 return (EINVAL); 686 if (iflr->dstaddr.ss_family 687 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in)) 688 return (EINVAL); 689 break; 690 default: /*shouldn't happen*/ 691 return (EOPNOTSUPP); 692 } 693 if (sizeof(struct in_addr) * 8 < iflr->prefixlen) 694 return (EINVAL); 695 696 switch (cmd) { 697 case SIOCALIFADDR: 698 { 699 struct in_aliasreq ifra; 700 701 if (iflr->flags & IFLR_PREFIX) 702 return (EINVAL); 703 704 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 705 bzero(&ifra, sizeof(ifra)); 706 bcopy(iflr->iflr_name, ifra.ifra_name, 707 sizeof(ifra.ifra_name)); 708 709 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len); 710 711 if (iflr->dstaddr.ss_family) { /*XXX*/ 712 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 713 iflr->dstaddr.ss_len); 714 } 715 716 ifra.ifra_mask.sin_family = AF_INET; 717 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in); 718 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen); 719 720 return (in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td)); 721 } 722 case SIOCGLIFADDR: 723 case SIOCDLIFADDR: 724 { 725 struct in_ifaddr *ia; 726 struct in_addr mask, candidate, match; 727 struct sockaddr_in *sin; 728 729 bzero(&mask, sizeof(mask)); 730 bzero(&match, sizeof(match)); 731 if (iflr->flags & IFLR_PREFIX) { 732 /* lookup a prefix rather than address. */ 733 in_len2mask(&mask, iflr->prefixlen); 734 735 sin = (struct sockaddr_in *)&iflr->addr; 736 match.s_addr = sin->sin_addr.s_addr; 737 match.s_addr &= mask.s_addr; 738 739 /* if you set extra bits, that's wrong */ 740 if (match.s_addr != sin->sin_addr.s_addr) 741 return (EINVAL); 742 743 } else { 744 /* on getting an address, take the 1st match */ 745 /* on deleting an address, do exact match */ 746 if (cmd != SIOCGLIFADDR) { 747 in_len2mask(&mask, 32); 748 sin = (struct sockaddr_in *)&iflr->addr; 749 match.s_addr = sin->sin_addr.s_addr; 750 } 751 } 752 753 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 754 if (ifa->ifa_addr->sa_family != AF_INET6) 755 continue; 756 if (match.s_addr == 0) 757 break; 758 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr; 759 candidate.s_addr &= mask.s_addr; 760 if (candidate.s_addr == match.s_addr) 761 break; 762 } 763 if (ifa == NULL) 764 return (EADDRNOTAVAIL); 765 ia = (struct in_ifaddr *)ifa; 766 767 if (cmd == SIOCGLIFADDR) { 768 /* fill in the if_laddrreq structure */ 769 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len); 770 771 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 772 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 773 ia->ia_dstaddr.sin_len); 774 } else 775 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 776 777 iflr->prefixlen = 778 in_mask2len(&ia->ia_sockmask.sin_addr); 779 780 iflr->flags = 0; /*XXX*/ 781 782 return (0); 783 } else { 784 struct in_aliasreq ifra; 785 786 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 787 bzero(&ifra, sizeof(ifra)); 788 bcopy(iflr->iflr_name, ifra.ifra_name, 789 sizeof(ifra.ifra_name)); 790 791 bcopy(&ia->ia_addr, &ifra.ifra_addr, 792 ia->ia_addr.sin_len); 793 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 794 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 795 ia->ia_dstaddr.sin_len); 796 } 797 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr, 798 ia->ia_sockmask.sin_len); 799 800 return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra, 801 ifp, td)); 802 } 803 } 804 } 805 806 return (EOPNOTSUPP); /*just for safety*/ 807 } 808 809 /* 810 * Delete any existing route for an interface. 811 */ 812 void 813 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia) 814 { 815 816 in_scrubprefix(ia); 817 } 818 819 /* 820 * Initialize an interface's internet address 821 * and routing table entry. 822 */ 823 static int 824 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin, 825 int scrub) 826 { 827 register u_long i = ntohl(sin->sin_addr.s_addr); 828 struct sockaddr_in oldaddr; 829 int s = splimp(), flags = RTF_UP, error = 0; 830 831 oldaddr = ia->ia_addr; 832 if (oldaddr.sin_family == AF_INET) 833 LIST_REMOVE(ia, ia_hash); 834 ia->ia_addr = *sin; 835 if (ia->ia_addr.sin_family == AF_INET) { 836 IN_IFADDR_WLOCK(); 837 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), 838 ia, ia_hash); 839 IN_IFADDR_WUNLOCK(); 840 } 841 /* 842 * Give the interface a chance to initialize 843 * if this is its first address, 844 * and to validate the address if necessary. 845 */ 846 if (ifp->if_ioctl != NULL) { 847 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 848 if (error) { 849 splx(s); 850 /* LIST_REMOVE(ia, ia_hash) is done in in_control */ 851 ia->ia_addr = oldaddr; 852 IN_IFADDR_WLOCK(); 853 if (ia->ia_addr.sin_family == AF_INET) 854 LIST_INSERT_HEAD(INADDR_HASH( 855 ia->ia_addr.sin_addr.s_addr), ia, ia_hash); 856 else 857 /* 858 * If oldaddr family is not AF_INET (e.g. 859 * interface has been just created) in_control 860 * does not call LIST_REMOVE, and we end up 861 * with bogus ia entries in hash 862 */ 863 LIST_REMOVE(ia, ia_hash); 864 IN_IFADDR_WUNLOCK(); 865 return (error); 866 } 867 } 868 splx(s); 869 if (scrub) { 870 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr; 871 in_ifscrub(ifp, ia); 872 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 873 } 874 if (IN_CLASSA(i)) 875 ia->ia_netmask = IN_CLASSA_NET; 876 else if (IN_CLASSB(i)) 877 ia->ia_netmask = IN_CLASSB_NET; 878 else 879 ia->ia_netmask = IN_CLASSC_NET; 880 /* 881 * The subnet mask usually includes at least the standard network part, 882 * but may may be smaller in the case of supernetting. 883 * If it is set, we believe it. 884 */ 885 if (ia->ia_subnetmask == 0) { 886 ia->ia_subnetmask = ia->ia_netmask; 887 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 888 } else 889 ia->ia_netmask &= ia->ia_subnetmask; 890 ia->ia_net = i & ia->ia_netmask; 891 ia->ia_subnet = i & ia->ia_subnetmask; 892 in_socktrim(&ia->ia_sockmask); 893 /* 894 * XXX: carp(4) does not have interface route 895 */ 896 if (ifp->if_type == IFT_CARP) 897 return (0); 898 /* 899 * Add route for the network. 900 */ 901 ia->ia_ifa.ifa_metric = ifp->if_metric; 902 if (ifp->if_flags & IFF_BROADCAST) { 903 ia->ia_broadaddr.sin_addr.s_addr = 904 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 905 ia->ia_netbroadcast.s_addr = 906 htonl(ia->ia_net | ~ ia->ia_netmask); 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_addr.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 return (EEXIST); 1044 else 1045 break; 1046 #endif 1047 if (V_sameprefixcarponly && 1048 target->ia_ifp->if_type != IFT_CARP && 1049 ia->ia_ifp->if_type != IFT_CARP) { 1050 IN_IFADDR_RUNLOCK(); 1051 return (EEXIST); 1052 } else { 1053 in_addralias_rtmsg(RTM_ADD, &prefix, target); 1054 IN_IFADDR_RUNLOCK(); 1055 return (0); 1056 } 1057 } 1058 } 1059 IN_IFADDR_RUNLOCK(); 1060 1061 /* 1062 * No-one seem to have this prefix route, so we try to insert it. 1063 */ 1064 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags); 1065 if (!error) 1066 target->ia_flags |= IFA_ROUTE; 1067 return (error); 1068 } 1069 1070 extern void arp_ifscrub(struct ifnet *ifp, uint32_t addr); 1071 1072 /* 1073 * If there is no other address in the system that can serve a route to the 1074 * same prefix, remove the route. Hand over the route to the new address 1075 * otherwise. 1076 */ 1077 static int 1078 in_scrubprefix(struct in_ifaddr *target) 1079 { 1080 struct in_ifaddr *ia; 1081 struct in_addr prefix, mask, p; 1082 int error = 0; 1083 struct sockaddr_in prefix0, mask0; 1084 1085 /* 1086 * Remove the loopback route to the interface address. 1087 * The "useloopback" setting is not consulted because if the 1088 * user configures an interface address, turns off this 1089 * setting, and then tries to delete that interface address, 1090 * checking the current setting of "useloopback" would leave 1091 * that interface address loopback route untouched, which 1092 * would be wrong. Therefore the interface address loopback route 1093 * deletion is unconditional. 1094 */ 1095 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) && 1096 !(target->ia_ifp->if_flags & IFF_LOOPBACK) && 1097 (target->ia_flags & IFA_RTSELF)) { 1098 struct route ia_ro; 1099 int freeit = 0; 1100 1101 bzero(&ia_ro, sizeof(ia_ro)); 1102 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = target->ia_addr; 1103 rtalloc_ign_fib(&ia_ro, 0, 0); 1104 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) && 1105 (ia_ro.ro_rt->rt_ifp == V_loif)) { 1106 RT_LOCK(ia_ro.ro_rt); 1107 if (ia_ro.ro_rt->rt_refcnt <= 1) 1108 freeit = 1; 1109 else 1110 RT_REMREF(ia_ro.ro_rt); 1111 RTFREE_LOCKED(ia_ro.ro_rt); 1112 } 1113 if (freeit) 1114 error = ifa_del_loopback_route((struct ifaddr *)target, 1115 (struct sockaddr *)&target->ia_addr); 1116 if (error == 0) 1117 target->ia_flags &= ~IFA_RTSELF; 1118 /* remove arp cache */ 1119 arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr); 1120 } 1121 1122 if (rtinitflags(target)) 1123 prefix = target->ia_dstaddr.sin_addr; 1124 else { 1125 prefix = target->ia_addr.sin_addr; 1126 mask = target->ia_sockmask.sin_addr; 1127 prefix.s_addr &= mask.s_addr; 1128 } 1129 1130 if ((target->ia_flags & IFA_ROUTE) == 0) { 1131 in_addralias_rtmsg(RTM_DELETE, &prefix, target); 1132 return (0); 1133 } 1134 1135 IN_IFADDR_RLOCK(); 1136 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1137 if (rtinitflags(ia)) 1138 p = ia->ia_dstaddr.sin_addr; 1139 else { 1140 p = ia->ia_addr.sin_addr; 1141 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr; 1142 } 1143 1144 if (prefix.s_addr != p.s_addr) 1145 continue; 1146 1147 /* 1148 * If we got a matching prefix address, move IFA_ROUTE and 1149 * the route itself to it. Make sure that routing daemons 1150 * get a heads-up. 1151 * 1152 * XXX: a special case for carp(4) interface - this should 1153 * be more generally specified as an interface that 1154 * doesn't support such action. 1155 */ 1156 if ((ia->ia_flags & IFA_ROUTE) == 0 1157 && (ia->ia_ifp->if_type != IFT_CARP) 1158 ) { 1159 IN_IFADDR_RUNLOCK(); 1160 rtinit(&(target->ia_ifa), (int)RTM_DELETE, 1161 rtinitflags(target)); 1162 target->ia_flags &= ~IFA_ROUTE; 1163 1164 error = rtinit(&ia->ia_ifa, (int)RTM_ADD, 1165 rtinitflags(ia) | RTF_UP); 1166 if (error == 0) 1167 ia->ia_flags |= IFA_ROUTE; 1168 return (error); 1169 } 1170 } 1171 IN_IFADDR_RUNLOCK(); 1172 1173 /* 1174 * remove all L2 entries on the given prefix 1175 */ 1176 bzero(&prefix0, sizeof(prefix0)); 1177 prefix0.sin_len = sizeof(prefix0); 1178 prefix0.sin_family = AF_INET; 1179 prefix0.sin_addr.s_addr = target->ia_subnet; 1180 bzero(&mask0, sizeof(mask0)); 1181 mask0.sin_len = sizeof(mask0); 1182 mask0.sin_family = AF_INET; 1183 mask0.sin_addr.s_addr = target->ia_subnetmask; 1184 lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0, 1185 (struct sockaddr *)&mask0); 1186 1187 /* 1188 * As no-one seem to have this prefix, we can remove the route. 1189 */ 1190 rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target)); 1191 target->ia_flags &= ~IFA_ROUTE; 1192 return (0); 1193 } 1194 1195 #undef rtinitflags 1196 1197 /* 1198 * Return 1 if the address might be a local broadcast address. 1199 */ 1200 int 1201 in_broadcast(struct in_addr in, struct ifnet *ifp) 1202 { 1203 register struct ifaddr *ifa; 1204 u_long t; 1205 1206 if (in.s_addr == INADDR_BROADCAST || 1207 in.s_addr == INADDR_ANY) 1208 return (1); 1209 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1210 return (0); 1211 t = ntohl(in.s_addr); 1212 /* 1213 * Look through the list of addresses for a match 1214 * with a broadcast address. 1215 */ 1216 #define ia ((struct in_ifaddr *)ifa) 1217 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1218 if (ifa->ifa_addr->sa_family == AF_INET && 1219 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1220 in.s_addr == ia->ia_netbroadcast.s_addr || 1221 /* 1222 * Check for old-style (host 0) broadcast. 1223 */ 1224 t == ia->ia_subnet || t == ia->ia_net) && 1225 /* 1226 * Check for an all one subnetmask. These 1227 * only exist when an interface gets a secondary 1228 * address. 1229 */ 1230 ia->ia_subnetmask != (u_long)0xffffffff) 1231 return (1); 1232 return (0); 1233 #undef ia 1234 } 1235 1236 /* 1237 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 1238 */ 1239 void 1240 in_ifdetach(struct ifnet *ifp) 1241 { 1242 1243 in_pcbpurgeif0(&V_ripcbinfo, ifp); 1244 in_pcbpurgeif0(&V_udbinfo, ifp); 1245 in_purgemaddrs(ifp); 1246 } 1247 1248 /* 1249 * Delete all IPv4 multicast address records, and associated link-layer 1250 * multicast address records, associated with ifp. 1251 * XXX It looks like domifdetach runs AFTER the link layer cleanup. 1252 * XXX This should not race with ifma_protospec being set during 1253 * a new allocation, if it does, we have bigger problems. 1254 */ 1255 static void 1256 in_purgemaddrs(struct ifnet *ifp) 1257 { 1258 LIST_HEAD(,in_multi) purgeinms; 1259 struct in_multi *inm, *tinm; 1260 struct ifmultiaddr *ifma; 1261 1262 LIST_INIT(&purgeinms); 1263 IN_MULTI_LOCK(); 1264 1265 /* 1266 * Extract list of in_multi associated with the detaching ifp 1267 * which the PF_INET layer is about to release. 1268 * We need to do this as IF_ADDR_LOCK() may be re-acquired 1269 * by code further down. 1270 */ 1271 IF_ADDR_LOCK(ifp); 1272 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1273 if (ifma->ifma_addr->sa_family != AF_INET || 1274 ifma->ifma_protospec == NULL) 1275 continue; 1276 #if 0 1277 KASSERT(ifma->ifma_protospec != NULL, 1278 ("%s: ifma_protospec is NULL", __func__)); 1279 #endif 1280 inm = (struct in_multi *)ifma->ifma_protospec; 1281 LIST_INSERT_HEAD(&purgeinms, inm, inm_link); 1282 } 1283 IF_ADDR_UNLOCK(ifp); 1284 1285 LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) { 1286 LIST_REMOVE(inm, inm_link); 1287 inm_release_locked(inm); 1288 } 1289 igmp_ifdetach(ifp); 1290 1291 IN_MULTI_UNLOCK(); 1292 } 1293 1294 #include <net/if_dl.h> 1295 #include <netinet/if_ether.h> 1296 1297 struct in_llentry { 1298 struct llentry base; 1299 struct sockaddr_in l3_addr4; 1300 }; 1301 1302 static struct llentry * 1303 in_lltable_new(const struct sockaddr *l3addr, u_int flags) 1304 { 1305 struct in_llentry *lle; 1306 1307 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_DONTWAIT | M_ZERO); 1308 if (lle == NULL) /* NB: caller generates msg */ 1309 return NULL; 1310 1311 callout_init(&lle->base.la_timer, CALLOUT_MPSAFE); 1312 /* 1313 * For IPv4 this will trigger "arpresolve" to generate 1314 * an ARP request. 1315 */ 1316 lle->base.la_expire = time_second; /* mark expired */ 1317 lle->l3_addr4 = *(const struct sockaddr_in *)l3addr; 1318 lle->base.lle_refcnt = 1; 1319 LLE_LOCK_INIT(&lle->base); 1320 return &lle->base; 1321 } 1322 1323 /* 1324 * Deletes an address from the address table. 1325 * This function is called by the timer functions 1326 * such as arptimer() and nd6_llinfo_timer(), and 1327 * the caller does the locking. 1328 */ 1329 static void 1330 in_lltable_free(struct lltable *llt, struct llentry *lle) 1331 { 1332 LLE_WUNLOCK(lle); 1333 LLE_LOCK_DESTROY(lle); 1334 free(lle, M_LLTABLE); 1335 } 1336 1337 1338 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 1339 (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 ) 1340 1341 static void 1342 in_lltable_prefix_free(struct lltable *llt, 1343 const struct sockaddr *prefix, 1344 const struct sockaddr *mask) 1345 { 1346 const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix; 1347 const struct sockaddr_in *msk = (const struct sockaddr_in *)mask; 1348 struct llentry *lle, *next; 1349 register int i; 1350 1351 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) { 1352 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 1353 1354 if (IN_ARE_MASKED_ADDR_EQUAL((struct sockaddr_in *)L3_ADDR(lle), 1355 pfx, msk)) { 1356 int canceled; 1357 1358 canceled = callout_drain(&lle->la_timer); 1359 LLE_WLOCK(lle); 1360 if (canceled) 1361 LLE_REMREF(lle); 1362 llentry_free(lle); 1363 } 1364 } 1365 } 1366 } 1367 1368 1369 static int 1370 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr) 1371 { 1372 struct rtentry *rt; 1373 1374 KASSERT(l3addr->sa_family == AF_INET, 1375 ("sin_family %d", l3addr->sa_family)); 1376 1377 /* XXX rtalloc1 should take a const param */ 1378 rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0); 1379 if (rt == NULL || (!(flags & LLE_PUB) && 1380 ((rt->rt_flags & RTF_GATEWAY) || 1381 (rt->rt_ifp != ifp)))) { 1382 #ifdef DIAGNOSTIC 1383 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n", 1384 inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr)); 1385 #endif 1386 if (rt != NULL) 1387 RTFREE_LOCKED(rt); 1388 return (EINVAL); 1389 } 1390 RTFREE_LOCKED(rt); 1391 return 0; 1392 } 1393 1394 /* 1395 * Return NULL if not found or marked for deletion. 1396 * If found return lle read locked. 1397 */ 1398 static struct llentry * 1399 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1400 { 1401 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1402 struct ifnet *ifp = llt->llt_ifp; 1403 struct llentry *lle; 1404 struct llentries *lleh; 1405 u_int hashkey; 1406 1407 IF_AFDATA_LOCK_ASSERT(ifp); 1408 KASSERT(l3addr->sa_family == AF_INET, 1409 ("sin_family %d", l3addr->sa_family)); 1410 1411 hashkey = sin->sin_addr.s_addr; 1412 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 1413 LIST_FOREACH(lle, lleh, lle_next) { 1414 struct sockaddr_in *sa2 = (struct sockaddr_in *)L3_ADDR(lle); 1415 if (lle->la_flags & LLE_DELETED) 1416 continue; 1417 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr) 1418 break; 1419 } 1420 if (lle == NULL) { 1421 #ifdef DIAGNOSTIC 1422 if (flags & LLE_DELETE) 1423 log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle); 1424 #endif 1425 if (!(flags & LLE_CREATE)) 1426 return (NULL); 1427 /* 1428 * A route that covers the given address must have 1429 * been installed 1st because we are doing a resolution, 1430 * verify this. 1431 */ 1432 if (!(flags & LLE_IFADDR) && 1433 in_lltable_rtcheck(ifp, flags, l3addr) != 0) 1434 goto done; 1435 1436 lle = in_lltable_new(l3addr, flags); 1437 if (lle == NULL) { 1438 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 1439 goto done; 1440 } 1441 lle->la_flags = flags & ~LLE_CREATE; 1442 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 1443 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 1444 lle->la_flags |= (LLE_VALID | LLE_STATIC); 1445 } 1446 1447 lle->lle_tbl = llt; 1448 lle->lle_head = lleh; 1449 LIST_INSERT_HEAD(lleh, lle, lle_next); 1450 } else if (flags & LLE_DELETE) { 1451 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 1452 LLE_WLOCK(lle); 1453 lle->la_flags = LLE_DELETED; 1454 EVENTHANDLER_INVOKE(arp_update_event, lle); 1455 LLE_WUNLOCK(lle); 1456 #ifdef DIAGNOSTIC 1457 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 1458 #endif 1459 } 1460 lle = (void *)-1; 1461 1462 } 1463 if (LLE_IS_VALID(lle)) { 1464 if (flags & LLE_EXCLUSIVE) 1465 LLE_WLOCK(lle); 1466 else 1467 LLE_RLOCK(lle); 1468 } 1469 done: 1470 return (lle); 1471 } 1472 1473 static int 1474 in_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 1475 { 1476 #define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle)) 1477 struct ifnet *ifp = llt->llt_ifp; 1478 struct llentry *lle; 1479 /* XXX stack use */ 1480 struct { 1481 struct rt_msghdr rtm; 1482 struct sockaddr_inarp sin; 1483 struct sockaddr_dl sdl; 1484 } arpc; 1485 int error, i; 1486 1487 LLTABLE_LOCK_ASSERT(); 1488 1489 error = 0; 1490 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 1491 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 1492 struct sockaddr_dl *sdl; 1493 1494 /* skip deleted entries */ 1495 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 1496 continue; 1497 /* Skip if jailed and not a valid IP of the prison. */ 1498 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 1499 continue; 1500 /* 1501 * produce a msg made of: 1502 * struct rt_msghdr; 1503 * struct sockaddr_inarp; (IPv4) 1504 * struct sockaddr_dl; 1505 */ 1506 bzero(&arpc, sizeof(arpc)); 1507 arpc.rtm.rtm_msglen = sizeof(arpc); 1508 arpc.rtm.rtm_version = RTM_VERSION; 1509 arpc.rtm.rtm_type = RTM_GET; 1510 arpc.rtm.rtm_flags = RTF_UP; 1511 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1512 arpc.sin.sin_family = AF_INET; 1513 arpc.sin.sin_len = sizeof(arpc.sin); 1514 arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr; 1515 1516 /* publish */ 1517 if (lle->la_flags & LLE_PUB) { 1518 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1519 /* proxy only */ 1520 if (lle->la_flags & LLE_PROXY) 1521 arpc.sin.sin_other = SIN_PROXY; 1522 } 1523 1524 sdl = &arpc.sdl; 1525 sdl->sdl_family = AF_LINK; 1526 sdl->sdl_len = sizeof(*sdl); 1527 sdl->sdl_index = ifp->if_index; 1528 sdl->sdl_type = ifp->if_type; 1529 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 1530 sdl->sdl_alen = ifp->if_addrlen; 1531 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1532 } else { 1533 sdl->sdl_alen = 0; 1534 bzero(LLADDR(sdl), ifp->if_addrlen); 1535 } 1536 1537 arpc.rtm.rtm_rmx.rmx_expire = 1538 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1539 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1540 if (lle->la_flags & LLE_STATIC) 1541 arpc.rtm.rtm_flags |= RTF_STATIC; 1542 arpc.rtm.rtm_index = ifp->if_index; 1543 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1544 if (error) 1545 break; 1546 } 1547 } 1548 return error; 1549 #undef SIN 1550 } 1551 1552 void * 1553 in_domifattach(struct ifnet *ifp) 1554 { 1555 struct in_ifinfo *ii; 1556 struct lltable *llt; 1557 1558 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); 1559 1560 llt = lltable_init(ifp, AF_INET); 1561 if (llt != NULL) { 1562 llt->llt_new = in_lltable_new; 1563 llt->llt_free = in_lltable_free; 1564 llt->llt_prefix_free = in_lltable_prefix_free; 1565 llt->llt_rtcheck = in_lltable_rtcheck; 1566 llt->llt_lookup = in_lltable_lookup; 1567 llt->llt_dump = in_lltable_dump; 1568 } 1569 ii->ii_llt = llt; 1570 1571 ii->ii_igmp = igmp_domifattach(ifp); 1572 1573 return ii; 1574 } 1575 1576 void 1577 in_domifdetach(struct ifnet *ifp, void *aux) 1578 { 1579 struct in_ifinfo *ii = (struct in_ifinfo *)aux; 1580 1581 igmp_domifdetach(ifp); 1582 lltable_free(ii->ii_llt); 1583 free(ii, M_IFADDR); 1584 } 1585