1 /* 2 * Copyright (C) 1993-2001, 2003 by Darren Reed. 3 * 4 * See the IPFILTER.LICENCE file for details on licencing. 5 * 6 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 7 * Use is subject to license terms. 8 */ 9 10 #pragma ident "%Z%%M% %I% %E% SMI" 11 12 #if !defined(lint) 13 static const char sccsid[] = "@(#)ip_fil.c 2.41 6/5/96 (C) 1993-2000 Darren Reed"; 14 static const char rcsid[] = "@(#)$Id: ip_fil.c,v 2.133.2.9 2005/01/08 14:22:18 darrenr Exp $"; 15 #endif 16 17 #ifndef SOLARIS 18 #define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4))) 19 #endif 20 21 #include <sys/param.h> 22 #if defined(__FreeBSD__) && !defined(__FreeBSD_version) 23 # if defined(IPFILTER_LKM) 24 # ifndef __FreeBSD_cc_version 25 # include <osreldate.h> 26 # else 27 # if __FreeBSD_cc_version < 430000 28 # include <osreldate.h> 29 # endif 30 # endif 31 # endif 32 #endif 33 #include <sys/errno.h> 34 #if defined(__hpux) && (HPUXREV >= 1111) && !defined(_KERNEL) 35 # include <sys/kern_svcs.h> 36 #endif 37 #include <sys/types.h> 38 #define _KERNEL 39 #define KERNEL 40 #ifdef __OpenBSD__ 41 struct file; 42 #endif 43 #include <sys/uio.h> 44 #undef _KERNEL 45 #undef KERNEL 46 #include <sys/file.h> 47 #include <sys/ioctl.h> 48 #ifdef __sgi 49 # include <sys/ptimers.h> 50 #endif 51 #include <sys/time.h> 52 #if !SOLARIS 53 # if (NetBSD > 199609) || (OpenBSD > 199603) || (__FreeBSD_version >= 300000) 54 # include <sys/dirent.h> 55 # else 56 # include <sys/dir.h> 57 # endif 58 #else 59 # include <sys/filio.h> 60 #endif 61 #ifndef linux 62 # include <sys/protosw.h> 63 #endif 64 #include <sys/socket.h> 65 66 #include <stdio.h> 67 #include <string.h> 68 #include <stdlib.h> 69 #include <ctype.h> 70 #include <fcntl.h> 71 #include <sys/zone.h> 72 #include <arpa/inet.h> 73 74 #ifdef __hpux 75 # define _NET_ROUTE_INCLUDED 76 #endif 77 #include <net/if.h> 78 #ifdef sun 79 # include <net/af.h> 80 #endif 81 #if __FreeBSD_version >= 300000 82 # include <net/if_var.h> 83 #endif 84 #ifdef __sgi 85 #include <sys/debug.h> 86 # ifdef IFF_DRVRLOCK /* IRIX6 */ 87 #include <sys/hashing.h> 88 # endif 89 #endif 90 #if defined(__FreeBSD__) 91 # include "radix_ipf.h" 92 #endif 93 #include <net/route.h> 94 #include <netinet/in.h> 95 #if !(defined(__sgi) && !defined(IFF_DRVRLOCK)) /* IRIX < 6 */ && \ 96 !defined(__hpux) && !defined(linux) 97 # include <netinet/in_var.h> 98 #endif 99 #include <netinet/in_systm.h> 100 #include <netinet/ip.h> 101 #if !defined(linux) 102 # include <netinet/ip_var.h> 103 #endif 104 #include <netinet/tcp.h> 105 #if defined(__osf__) 106 # include <netinet/tcp_timer.h> 107 #endif 108 #if defined(__osf__) || defined(__hpux) || defined(__sgi) 109 # include "radix_ipf_local.h" 110 # define _RADIX_H_ 111 #endif 112 #include <netinet/udp.h> 113 #include <netinet/tcpip.h> 114 #include <netinet/ip_icmp.h> 115 #include <unistd.h> 116 #include <syslog.h> 117 #ifdef __hpux 118 # undef _NET_ROUTE_INCLUDED 119 #endif 120 #include "netinet/ip_compat.h" 121 #include "netinet/ip_fil.h" 122 #include "netinet/ip_nat.h" 123 #include "netinet/ip_frag.h" 124 #include "netinet/ip_state.h" 125 #include "netinet/ip_proxy.h" 126 #include "netinet/ip_auth.h" 127 #ifdef IPFILTER_SYNC 128 #include "netinet/ip_sync.h" 129 #endif 130 #ifdef IPFILTER_SCAN 131 #include "netinet/ip_scan.h" 132 #endif 133 #include "netinet/ip_pool.h" 134 #ifdef IPFILTER_COMPILED 135 # include "netinet/ip_rules.h" 136 #endif 137 #include "netinet/ipf_stack.h" 138 #if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000) 139 # include <sys/malloc.h> 140 #endif 141 #ifdef __hpux 142 struct rtentry; 143 #endif 144 #include "md5.h" 145 146 147 #if !defined(__osf__) 148 extern struct protosw inetsw[]; 149 #endif 150 151 #include "ipt.h" 152 static struct ifnet **ifneta = NULL; 153 static int nifs = 0; 154 155 static int frzerostats __P((caddr_t, ipf_stack_t *ifs)); 156 static void fr_setifpaddr __P((struct ifnet *, char *)); 157 void init_ifp __P((void)); 158 #if defined(__sgi) && (IRIX < 60500) 159 static int no_output __P((struct ifnet *, struct mbuf *, 160 struct sockaddr *)); 161 static int write_output __P((struct ifnet *, struct mbuf *, 162 struct sockaddr *)); 163 #else 164 # if TRU64 >= 1885 165 static int no_output __P((struct ifnet *, struct mbuf *, 166 struct sockaddr *, struct rtentry *, char *)); 167 static int write_output __P((struct ifnet *, struct mbuf *, 168 struct sockaddr *, struct rtentry *, char *)); 169 # else 170 static int no_output __P((struct ifnet *, struct mbuf *, 171 struct sockaddr *, struct rtentry *)); 172 static int write_output __P((struct ifnet *, struct mbuf *, 173 struct sockaddr *, struct rtentry *)); 174 # endif 175 #endif 176 177 178 int iplattach(ifs, ns) 179 ipf_stack_t *ifs; 180 netstack_t *ns; 181 { 182 ifs->ifs_fr_running = 1; 183 return 0; 184 } 185 186 187 int ipldetach(ifs) 188 ipf_stack_t *ifs; 189 { 190 ifs->ifs_fr_running = -1; 191 return 0; 192 } 193 194 195 static int frzerostats(data, ifs) 196 caddr_t data; 197 ipf_stack_t *ifs; 198 { 199 friostat_t fio; 200 int error; 201 202 fr_getstat(&fio, ifs); 203 error = copyoutptr(&fio, data, sizeof(fio)); 204 if (error) 205 return EFAULT; 206 207 bzero((char *)ifs->ifs_frstats, sizeof(*ifs->ifs_frstats) * 2); 208 209 return 0; 210 } 211 212 213 /* 214 * Filter ioctl interface. 215 */ 216 int iplioctl(dev, cmd, data, mode) 217 int dev; 218 ioctlcmd_t cmd; 219 caddr_t data; 220 int mode; 221 { 222 int error = 0, unit = 0, tmp, uid; 223 friostat_t fio; 224 ipf_stack_t *ifs; 225 extern ipf_stack_t *get_ifs(); 226 227 unit = dev; 228 uid = getuid(); 229 230 ifs = get_ifs(); 231 232 SPL_NET(s); 233 234 if (unit == IPL_LOGNAT) { 235 if (ifs->ifs_fr_running > 0) 236 error = fr_nat_ioctl(data, cmd, mode, uid, NULL, ifs); 237 else 238 error = EIO; 239 SPL_X(s); 240 return error; 241 } 242 if (unit == IPL_LOGSTATE) { 243 if (ifs->ifs_fr_running > 0) 244 error = fr_state_ioctl(data, cmd, mode, uid, NULL, ifs); 245 else 246 error = EIO; 247 SPL_X(s); 248 return error; 249 } 250 if (unit == IPL_LOGAUTH) { 251 if (ifs->ifs_fr_running > 0) { 252 if ((cmd == (ioctlcmd_t)SIOCADAFR) || 253 (cmd == (ioctlcmd_t)SIOCRMAFR)) { 254 if (!(mode & FWRITE)) { 255 error = EPERM; 256 } else { 257 error = frrequest(unit, cmd, data, 258 ifs->ifs_fr_active, 1, ifs); 259 } 260 } else { 261 error = fr_auth_ioctl(data, mode, cmd, uid, NULL, ifs); 262 } 263 } else 264 error = EIO; 265 SPL_X(s); 266 return error; 267 } 268 if (unit == IPL_LOGSYNC) { 269 #ifdef IPFILTER_SYNC 270 if (ifs->ifs_fr_running > 0) 271 error = fr_sync_ioctl(data, cmd, mode); 272 else 273 #endif 274 error = EIO; 275 SPL_X(s); 276 return error; 277 } 278 if (unit == IPL_LOGSCAN) { 279 #ifdef IPFILTER_SCAN 280 if (ifs->ifs_fr_running > 0) 281 error = fr_scan_ioctl(data, cmd, mode); 282 else 283 #endif 284 error = EIO; 285 SPL_X(s); 286 return error; 287 } 288 if (unit == IPL_LOGLOOKUP) { 289 if (ifs->ifs_fr_running > 0) 290 error = ip_lookup_ioctl(data, cmd, mode, uid, 291 NULL, ifs); 292 else 293 error = EIO; 294 SPL_X(s); 295 return error; 296 } 297 298 switch (cmd) 299 { 300 case FIONREAD : 301 #ifdef IPFILTER_LOG 302 error = COPYOUT(&ifs->ifs_iplused[IPL_LOGIPF], (caddr_t)data, 303 sizeof(ifs->ifs_iplused[IPL_LOGIPF])); 304 #endif 305 break; 306 case SIOCFRENB : 307 if (!(mode & FWRITE)) 308 error = EPERM; 309 else { 310 error = COPYIN(data, &tmp, sizeof(tmp)); 311 if (error) 312 break; 313 if (tmp) 314 error = iplattach(ifs, NULL); 315 else 316 error = ipldetach(ifs); 317 } 318 break; 319 case SIOCIPFSET : 320 if (!(mode & FWRITE)) { 321 error = EPERM; 322 break; 323 } 324 case SIOCIPFGETNEXT : 325 case SIOCIPFGET : 326 error = fr_ipftune(cmd, (void *)data, ifs); 327 break; 328 case SIOCSETFF : 329 if (!(mode & FWRITE)) 330 error = EPERM; 331 else 332 error = COPYIN(data, &ifs->ifs_fr_flags, 333 sizeof(ifs->ifs_fr_flags)); 334 break; 335 case SIOCGETFF : 336 error = COPYOUT(&ifs->ifs_fr_flags, data, 337 sizeof(ifs->ifs_fr_flags)); 338 break; 339 case SIOCFUNCL : 340 error = fr_resolvefunc(data); 341 break; 342 case SIOCINAFR : 343 case SIOCRMAFR : 344 case SIOCADAFR : 345 case SIOCZRLST : 346 if (!(mode & FWRITE)) 347 error = EPERM; 348 else 349 error = frrequest(unit, cmd, data, 350 ifs->ifs_fr_active, 1, ifs); 351 break; 352 case SIOCINIFR : 353 case SIOCRMIFR : 354 case SIOCADIFR : 355 if (!(mode & FWRITE)) 356 error = EPERM; 357 else 358 error = frrequest(unit, cmd, data, 359 1 - ifs->ifs_fr_active, 1, ifs); 360 break; 361 case SIOCSWAPA : 362 if (!(mode & FWRITE)) 363 error = EPERM; 364 else { 365 bzero((char *)ifs->ifs_frcache, 366 sizeof(ifs->ifs_frcache[0]) * 2); 367 *(u_int *)data = ifs->ifs_fr_active; 368 ifs->ifs_fr_active = 1 - ifs->ifs_fr_active; 369 } 370 break; 371 case SIOCGETFS : 372 fr_getstat(&fio, ifs); 373 error = fr_outobj(data, &fio, IPFOBJ_IPFSTAT); 374 break; 375 case SIOCFRZST : 376 if (!(mode & FWRITE)) 377 error = EPERM; 378 else 379 error = frzerostats(data, ifs); 380 break; 381 case SIOCIPFFL : 382 if (!(mode & FWRITE)) 383 error = EPERM; 384 else { 385 error = COPYIN(data, &tmp, sizeof(tmp)); 386 if (!error) { 387 tmp = frflush(unit, 4, tmp, ifs); 388 error = COPYOUT(&tmp, data, sizeof(tmp)); 389 } 390 } 391 break; 392 #ifdef USE_INET6 393 case SIOCIPFL6 : 394 if (!(mode & FWRITE)) 395 error = EPERM; 396 else { 397 error = COPYIN(data, &tmp, sizeof(tmp)); 398 if (!error) { 399 tmp = frflush(unit, 6, tmp, ifs); 400 error = COPYOUT(&tmp, data, sizeof(tmp)); 401 } 402 } 403 break; 404 #endif 405 case SIOCSTLCK : 406 error = COPYIN(data, &tmp, sizeof(tmp)); 407 if (error == 0) { 408 ifs->ifs_fr_state_lock = tmp; 409 ifs->ifs_fr_nat_lock = tmp; 410 ifs->ifs_fr_frag_lock = tmp; 411 ifs->ifs_fr_auth_lock = tmp; 412 } else 413 error = EFAULT; 414 break; 415 #ifdef IPFILTER_LOG 416 case SIOCIPFFB : 417 if (!(mode & FWRITE)) 418 error = EPERM; 419 else 420 *(int *)data = ipflog_clear(unit, ifs); 421 break; 422 #endif /* IPFILTER_LOG */ 423 case SIOCGFRST : 424 error = fr_outobj(data, fr_fragstats(ifs), IPFOBJ_FRAGSTAT); 425 break; 426 case SIOCFRSYN : 427 if (!(mode & FWRITE)) 428 error = EPERM; 429 else { 430 frsync(IPFSYNC_RESYNC, IPFSYNC_RESYNC, NULL, NULL, ifs); 431 } 432 break; 433 default : 434 error = EINVAL; 435 break; 436 } 437 SPL_X(s); 438 return error; 439 } 440 441 442 void fr_forgetifp(ifp, ifs) 443 void *ifp; 444 ipf_stack_t *ifs; 445 { 446 register frentry_t *f; 447 448 WRITE_ENTER(&ifs->ifs_ipf_mutex); 449 for (f = ifs->ifs_ipacct[0][ifs->ifs_fr_active]; (f != NULL); 450 f = f->fr_next) 451 if (f->fr_ifa == ifp) 452 f->fr_ifa = (void *)-1; 453 for (f = ifs->ifs_ipacct[1][ifs->ifs_fr_active]; (f != NULL); 454 f = f->fr_next) 455 if (f->fr_ifa == ifp) 456 f->fr_ifa = (void *)-1; 457 for (f = ifs->ifs_ipfilter[0][ifs->ifs_fr_active]; (f != NULL); 458 f = f->fr_next) 459 if (f->fr_ifa == ifp) 460 f->fr_ifa = (void *)-1; 461 for (f = ifs->ifs_ipfilter[1][ifs->ifs_fr_active]; (f != NULL); 462 f = f->fr_next) 463 if (f->fr_ifa == ifp) 464 f->fr_ifa = (void *)-1; 465 #ifdef USE_INET6 466 for (f = ifs->ifs_ipacct6[0][ifs->ifs_fr_active]; (f != NULL); 467 f = f->fr_next) 468 if (f->fr_ifa == ifp) 469 f->fr_ifa = (void *)-1; 470 for (f = ifs->ifs_ipacct6[1][ifs->ifs_fr_active]; (f != NULL); 471 f = f->fr_next) 472 if (f->fr_ifa == ifp) 473 f->fr_ifa = (void *)-1; 474 for (f = ifs->ifs_ipfilter6[0][ifs->ifs_fr_active]; (f != NULL); 475 f = f->fr_next) 476 if (f->fr_ifa == ifp) 477 f->fr_ifa = (void *)-1; 478 for (f = ifs->ifs_ipfilter6[1][ifs->ifs_fr_active]; (f != NULL); 479 f = f->fr_next) 480 if (f->fr_ifa == ifp) 481 f->fr_ifa = (void *)-1; 482 #endif 483 RWLOCK_EXIT(&ifs->ifs_ipf_mutex); 484 fr_natifpsync(IPFSYNC_OLDIFP, ifp, NULL, ifs); 485 } 486 487 488 void fr_resolvedest(fdp, v, ifs) 489 frdest_t *fdp; 490 int v; 491 ipf_stack_t *ifs; 492 { 493 fdp->fd_ifp = NULL; 494 495 if (*fdp->fd_ifname) { 496 fdp->fd_ifp = GETIFP(fdp->fd_ifname, v, ifs); 497 if (!fdp->fd_ifp) 498 fdp->fd_ifp = (struct ifnet *)-1; 499 } 500 } 501 502 503 #if defined(__sgi) && (IRIX < 60500) 504 static int no_output(ifp, m, s) 505 #else 506 # if TRU64 >= 1885 507 static int no_output (ifp, m, s, rt, cp) 508 char *cp; 509 # else 510 static int no_output(ifp, m, s, rt) 511 # endif 512 struct rtentry *rt; 513 #endif 514 struct ifnet *ifp; 515 struct mbuf *m; 516 struct sockaddr *s; 517 { 518 return 0; 519 } 520 521 522 #if defined(__sgi) && (IRIX < 60500) 523 static int write_output(ifp, m, s) 524 #else 525 # if TRU64 >= 1885 526 static int write_output (ifp, m, s, rt, cp) 527 char *cp; 528 # else 529 static int write_output(ifp, m, s, rt) 530 # endif 531 struct rtentry *rt; 532 #endif 533 struct ifnet *ifp; 534 struct mbuf *m; 535 struct sockaddr *s; 536 { 537 char fname[32]; 538 mb_t *mb; 539 ip_t *ip; 540 int fd; 541 542 mb = (mb_t *)m; 543 ip = MTOD(mb, ip_t *); 544 545 #if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606)) || \ 546 (defined(OpenBSD) && (OpenBSD >= 199603)) || defined(linux) || \ 547 (defined(__FreeBSD__) && (__FreeBSD_version >= 501113)) 548 sprintf(fname, "/tmp/%s", ifp->if_xname); 549 #else 550 sprintf(fname, "/tmp/%s%d", ifp->if_name, ifp->if_unit); 551 #endif 552 fd = open(fname, O_WRONLY|O_APPEND); 553 if (fd == -1) { 554 perror("open"); 555 return -1; 556 } 557 write(fd, (char *)ip, ntohs(ip->ip_len)); 558 close(fd); 559 return 0; 560 } 561 562 563 static void fr_setifpaddr(ifp, addr) 564 struct ifnet *ifp; 565 char *addr; 566 { 567 #ifdef __sgi 568 struct in_ifaddr *ifa; 569 #else 570 struct ifaddr *ifa; 571 #endif 572 573 #if defined(__NetBSD__) || defined(__OpenBSD__) || defined(__FreeBSD__) 574 if (ifp->if_addrlist.tqh_first != NULL) 575 #else 576 # ifdef __sgi 577 if (ifp->in_ifaddr != NULL) 578 # else 579 if (ifp->if_addrlist != NULL) 580 # endif 581 #endif 582 return; 583 584 ifa = (struct ifaddr *)malloc(sizeof(*ifa)); 585 #if defined(__NetBSD__) || defined(__OpenBSD__) || defined(__FreeBSD__) 586 ifp->if_addrlist.tqh_first = ifa; 587 #else 588 # ifdef __sgi 589 ifp->in_ifaddr = ifa; 590 # else 591 ifp->if_addrlist = ifa; 592 # endif 593 #endif 594 595 if (ifa != NULL) { 596 struct sockaddr_in *sin; 597 598 #ifdef __sgi 599 sin = (struct sockaddr_in *)&ifa->ia_addr; 600 #else 601 sin = (struct sockaddr_in *)&ifa->ifa_addr; 602 #endif 603 sin->sin_addr.s_addr = inet_addr(addr); 604 if (sin->sin_addr.s_addr == 0) 605 abort(); 606 } 607 } 608 609 /*ARGSUSED*/ 610 struct ifnet *get_unit(name, v, ifs) 611 char *name; 612 int v; 613 ipf_stack_t *ifs; 614 { 615 struct ifnet *ifp, **ifpp, **old_ifneta; 616 char *addr; 617 #if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606)) || \ 618 (defined(OpenBSD) && (OpenBSD >= 199603)) || defined(linux) || \ 619 (defined(__FreeBSD__) && (__FreeBSD_version >= 501113)) 620 621 if (name == NULL) 622 name = "anon0"; 623 624 addr = strchr(name, '='); 625 if (addr != NULL) 626 *addr++ = '\0'; 627 628 for (ifpp = ifneta; ifpp && (ifp = *ifpp); ifpp++) { 629 if (!strcmp(name, ifp->if_xname)) { 630 if (addr != NULL) 631 fr_setifpaddr(ifp, addr); 632 return ifp; 633 } 634 } 635 #else 636 char *s, ifname[LIFNAMSIZ+1]; 637 638 if (name == NULL) 639 name = "anon0"; 640 641 addr = strchr(name, '='); 642 if (addr != NULL) 643 *addr++ = '\0'; 644 645 for (ifpp = ifneta; ifpp && (ifp = *ifpp); ifpp++) { 646 COPYIFNAME(ifp, ifname, 0); 647 if (!strcmp(name, ifname)) { 648 if (addr != NULL) 649 fr_setifpaddr(ifp, addr); 650 return ifp; 651 } 652 } 653 #endif 654 655 if (!ifneta) { 656 ifneta = (struct ifnet **)malloc(sizeof(ifp) * 2); 657 if (!ifneta) 658 return NULL; 659 ifneta[1] = NULL; 660 ifneta[0] = (struct ifnet *)calloc(1, sizeof(*ifp)); 661 if (!ifneta[0]) { 662 free(ifneta); 663 return NULL; 664 } 665 nifs = 1; 666 } else { 667 old_ifneta = ifneta; 668 nifs++; 669 ifneta = (struct ifnet **)realloc(ifneta, 670 (nifs + 1) * sizeof(ifp)); 671 if (!ifneta) { 672 free(old_ifneta); 673 nifs = 0; 674 return NULL; 675 } 676 ifneta[nifs] = NULL; 677 ifneta[nifs - 1] = (struct ifnet *)malloc(sizeof(*ifp)); 678 if (!ifneta[nifs - 1]) { 679 nifs--; 680 return NULL; 681 } 682 } 683 ifp = ifneta[nifs - 1]; 684 685 #if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606)) || \ 686 (defined(OpenBSD) && (OpenBSD >= 199603)) || defined(linux) || \ 687 (defined(__FreeBSD__) && (__FreeBSD_version >= 501113)) 688 (void) strncpy(ifp->if_xname, name, sizeof(ifp->if_xname)); 689 #else 690 for (s = name; *s && !ISDIGIT(*s); s++) 691 ; 692 if (*s && ISDIGIT(*s)) { 693 ifp->if_unit = atoi(s); 694 ifp->if_name = (char *)malloc(s - name + 1); 695 if (ifp->if_name == NULL) { 696 /* 697 * XXX do it more elegantly: free up mem, 698 * return NULL 699 */ 700 perror("malloc"); 701 exit(1); 702 } 703 (void) strncpy(ifp->if_name, name, s - name); 704 ifp->if_name[s - name] = '\0'; 705 } else { 706 ifp->if_name = strdup(name); 707 ifp->if_unit = -1; 708 } 709 #endif 710 ifp->if_output = no_output; 711 712 if (addr != NULL) { 713 fr_setifpaddr(ifp, addr); 714 } 715 716 return ifp; 717 } 718 719 720 char *get_ifname(ifp) 721 struct ifnet *ifp; 722 { 723 static char ifname[LIFNAMSIZ]; 724 725 #if defined(__OpenBSD__) || defined(__NetBSD__) || defined(linux) || \ 726 (defined(__FreeBSD__) && (__FreeBSD_version >= 501113)) 727 sprintf(ifname, "%s", ifp->if_xname); 728 #else 729 sprintf(ifname, "%s%d", ifp->if_name, ifp->if_unit); 730 #endif 731 return ifname; 732 } 733 734 735 736 void init_ifp() 737 { 738 struct ifnet *ifp, **ifpp; 739 char fname[32]; 740 int fd; 741 742 #if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606)) || \ 743 (defined(OpenBSD) && (OpenBSD >= 199603)) || defined(linux) || \ 744 (defined(__FreeBSD__) && (__FreeBSD_version >= 501113)) 745 for (ifpp = ifneta; ifpp && (ifp = *ifpp); ifpp++) { 746 ifp->if_output = write_output; 747 sprintf(fname, "/tmp/%s", ifp->if_xname); 748 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL|O_TRUNC, 0600); 749 if (fd == -1) 750 perror("open"); 751 else 752 close(fd); 753 } 754 #else 755 756 for (ifpp = ifneta; ifpp && (ifp = *ifpp); ifpp++) { 757 ifp->if_output = write_output; 758 sprintf(fname, "/tmp/%s%d", ifp->if_name, ifp->if_unit); 759 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL|O_TRUNC, 0600); 760 if (fd == -1) 761 perror("open"); 762 else 763 close(fd); 764 } 765 #endif 766 } 767 768 769 int fr_fastroute(m, mpp, fin, fdp) 770 mb_t *m, **mpp; 771 fr_info_t *fin; 772 frdest_t *fdp; 773 { 774 struct ifnet *ifp = fdp->fd_ifp; 775 ip_t *ip = fin->fin_ip; 776 777 if (!ifp) 778 return 0; /* no routing table out here */ 779 780 ip->ip_len = htons((u_short)ip->ip_len); 781 ip->ip_off = htons((u_short)(ip->ip_off | IP_MF)); 782 ip->ip_sum = 0; 783 #if defined(__sgi) && (IRIX < 60500) 784 (*ifp->if_output)(ifp, (void *)ip, NULL); 785 # if TRU64 >= 1885 786 (*ifp->if_output)(ifp, (void *)m, NULL, 0, 0); 787 # else 788 (*ifp->if_output)(ifp, (void *)m, NULL, 0); 789 # endif 790 #endif 791 return 0; 792 } 793 794 795 int fr_send_reset(fin) 796 fr_info_t *fin; 797 { 798 verbose("- TCP RST sent\n"); 799 return 0; 800 } 801 802 803 int fr_send_icmp_err(type, fin, dst) 804 int type; 805 fr_info_t *fin; 806 int dst; 807 { 808 verbose("- ICMP unreachable sent\n"); 809 return 0; 810 } 811 812 813 void frsync(command, version, nic, data, ifs) 814 int command, version; 815 void *nic; 816 char *data; 817 ipf_stack_t *ifs; 818 { 819 return; 820 } 821 822 823 void m_freem(m) 824 mb_t *m; 825 { 826 return; 827 } 828 829 830 void m_copydata(m, off, len, cp) 831 mb_t *m; 832 int off, len; 833 caddr_t cp; 834 { 835 bcopy((char *)m + off, cp, len); 836 } 837 838 839 int ipfuiomove(buf, len, rwflag, uio) 840 caddr_t buf; 841 int len, rwflag; 842 struct uio *uio; 843 { 844 int left, ioc, num, offset; 845 struct iovec *io; 846 char *start; 847 848 if (rwflag == UIO_READ) { 849 left = len; 850 ioc = 0; 851 852 offset = uio->uio_offset; 853 854 while ((left > 0) && (ioc < uio->uio_iovcnt)) { 855 io = uio->uio_iov + ioc; 856 num = io->iov_len; 857 if (num > left) 858 num = left; 859 start = (char *)io->iov_base + offset; 860 if (start > (char *)io->iov_base + io->iov_len) { 861 offset -= io->iov_len; 862 ioc++; 863 continue; 864 } 865 bcopy(buf, start, num); 866 uio->uio_resid -= num; 867 uio->uio_offset += num; 868 left -= num; 869 if (left > 0) 870 ioc++; 871 } 872 if (left > 0) 873 return EFAULT; 874 } 875 return 0; 876 } 877 878 879 u_32_t fr_newisn(fin) 880 fr_info_t *fin; 881 { 882 static int iss_seq_off = 0; 883 u_char hash[16]; 884 u_32_t newiss; 885 MD5_CTX ctx; 886 887 /* 888 * Compute the base value of the ISS. It is a hash 889 * of (saddr, sport, daddr, dport, secret). 890 */ 891 MD5Init(&ctx); 892 893 MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_src, 894 sizeof(fin->fin_fi.fi_src)); 895 MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_dst, 896 sizeof(fin->fin_fi.fi_dst)); 897 MD5Update(&ctx, (u_char *) &fin->fin_dat, sizeof(fin->fin_dat)); 898 899 /* MD5Update(&ctx, ipf_iss_secret, sizeof(ipf_iss_secret)); */ 900 901 MD5Final(hash, &ctx); 902 903 memcpy(&newiss, hash, sizeof(newiss)); 904 905 /* 906 * Now increment our "timer", and add it in to 907 * the computed value. 908 * 909 * XXX Use `addin'? 910 * XXX TCP_ISSINCR too large to use? 911 */ 912 iss_seq_off += 0x00010000; 913 newiss += iss_seq_off; 914 return newiss; 915 } 916 917 918 /* ------------------------------------------------------------------------ */ 919 /* Function: fr_nextipid */ 920 /* Returns: int - 0 == success, -1 == error (packet should be droppped) */ 921 /* Parameters: fin(I) - pointer to packet information */ 922 /* */ 923 /* Returns the next IPv4 ID to use for this packet. */ 924 /* ------------------------------------------------------------------------ */ 925 INLINE u_short fr_nextipid(fin) 926 fr_info_t *fin; 927 { 928 static u_short ipid = 0; 929 u_short id; 930 ipf_stack_t *ifs = fin->fin_ifs; 931 932 MUTEX_ENTER(&ifs->ifs_ipf_rw); 933 id = ipid++; 934 MUTEX_EXIT(&ifs->ifs_ipf_rw); 935 936 return id; 937 } 938 939 940 INLINE void fr_checkv4sum(fin) 941 fr_info_t *fin; 942 { 943 if (fr_checkl4sum(fin) == -1) 944 fin->fin_flx |= FI_BAD; 945 } 946 947 948 #ifdef USE_INET6 949 INLINE void fr_checkv6sum(fin) 950 fr_info_t *fin; 951 { 952 if (fr_checkl4sum(fin) == -1) 953 fin->fin_flx |= FI_BAD; 954 } 955 #endif 956 957 958 /* 959 * See above for description, except that all addressing is in user space. 960 */ 961 int copyoutptr(src, dst, size) 962 void *src, *dst; 963 size_t size; 964 { 965 caddr_t ca; 966 967 bcopy(dst, (char *)&ca, sizeof(ca)); 968 bcopy(src, ca, size); 969 return 0; 970 } 971 972 973 /* 974 * See above for description, except that all addressing is in user space. 975 */ 976 int copyinptr(src, dst, size) 977 void *src, *dst; 978 size_t size; 979 { 980 caddr_t ca; 981 982 bcopy(src, (char *)&ca, sizeof(ca)); 983 bcopy(ca, dst, size); 984 return 0; 985 } 986 987 988 /* 989 * return the first IP Address associated with an interface 990 */ 991 int fr_ifpaddr(v, atype, ifptr, inp, inpmask, ifs) 992 int v, atype; 993 void *ifptr; 994 struct in_addr *inp, *inpmask; 995 ipf_stack_t *ifs; 996 { 997 struct ifnet *ifp = ifptr; 998 #ifdef __sgi 999 struct in_ifaddr *ifa; 1000 #else 1001 struct ifaddr *ifa; 1002 #endif 1003 1004 #if defined(__NetBSD__) || defined(__OpenBSD__) || defined(__FreeBSD__) 1005 ifa = ifp->if_addrlist.tqh_first; 1006 #else 1007 # ifdef __sgi 1008 ifa = (struct in_ifaddr *)ifp->in_ifaddr; 1009 # else 1010 ifa = ifp->if_addrlist; 1011 # endif 1012 #endif 1013 if (ifa != NULL) { 1014 struct sockaddr_in *sin, mask; 1015 1016 mask.sin_addr.s_addr = 0xffffffff; 1017 1018 #ifdef __sgi 1019 sin = (struct sockaddr_in *)&ifa->ia_addr; 1020 #else 1021 sin = (struct sockaddr_in *)&ifa->ifa_addr; 1022 #endif 1023 1024 return fr_ifpfillv4addr(atype, sin, &mask, inp, inpmask); 1025 } 1026 return 0; 1027 } 1028