1 /* 2 * Copyright (C) 1997-2003 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(KERNEL) || defined(_KERNEL) 13 # undef KERNEL 14 # undef _KERNEL 15 # define KERNEL 1 16 # define _KERNEL 1 17 #endif 18 #include <sys/errno.h> 19 #include <sys/types.h> 20 #include <sys/param.h> 21 #include <sys/time.h> 22 #include <sys/file.h> 23 #if !defined(AIX) 24 # include <sys/fcntl.h> 25 #endif 26 #if !defined(_KERNEL) && !defined(__KERNEL__) 27 # include <stdio.h> 28 # include <string.h> 29 # include <stdlib.h> 30 # include <ctype.h> 31 # define _KERNEL 32 # ifdef __OpenBSD__ 33 struct file; 34 # endif 35 # include <sys/uio.h> 36 # undef _KERNEL 37 #endif 38 #if !defined(linux) 39 # include <sys/protosw.h> 40 #endif 41 #include <sys/socket.h> 42 #if defined(_KERNEL) 43 # if !defined(__NetBSD__) && !defined(sun) && !defined(__osf__) && \ 44 !defined(__OpenBSD__) && !defined(__hpux) && !defined(__sgi) && \ 45 !defined(AIX) 46 # include <sys/ctype.h> 47 # endif 48 # include <sys/systm.h> 49 # if !defined(__SVR4) && !defined(__svr4__) 50 # include <sys/mbuf.h> 51 # endif 52 #endif 53 #if defined(_KERNEL) && (__FreeBSD_version >= 220000) 54 # include <sys/filio.h> 55 # include <sys/fcntl.h> 56 # if (__FreeBSD_version >= 300000) && !defined(IPFILTER_LKM) 57 # include "opt_ipfilter.h" 58 # endif 59 #else 60 # include <sys/ioctl.h> 61 #endif 62 #if defined(__SVR4) || defined(__svr4__) 63 # include <sys/byteorder.h> 64 # ifdef _KERNEL 65 # include <sys/dditypes.h> 66 # endif 67 # include <sys/stream.h> 68 # include <sys/kmem.h> 69 #endif 70 #if __FreeBSD__ > 2 71 # include <sys/queue.h> 72 #endif 73 #include <net/if.h> 74 #ifdef sun 75 # include <net/af.h> 76 #endif 77 #include <net/route.h> 78 #include <netinet/in.h> 79 #include <netinet/in_systm.h> 80 #include <netinet/ip.h> 81 #ifndef linux 82 # include <netinet/ip_var.h> 83 #endif 84 #include <netinet/tcp.h> 85 #include <netinet/udp.h> 86 #include <netinet/ip_icmp.h> 87 #include "netinet/ip_compat.h" 88 #include <netinet/tcpip.h> 89 #include "netinet/ipf_stack.h" 90 #include "netinet/ip_fil.h" 91 #include "netinet/ip_nat.h" 92 #include "netinet/ip_state.h" 93 #include "netinet/ip_proxy.h" 94 #if (__FreeBSD_version >= 300000) 95 # include <sys/malloc.h> 96 #endif 97 98 #include "netinet/ip_ftp_pxy.c" 99 #include "netinet/ip_rcmd_pxy.c" 100 # include "netinet/ip_pptp_pxy.c" 101 #if defined(_KERNEL) 102 # include "netinet/ip_irc_pxy.c" 103 # include "netinet/ip_raudio_pxy.c" 104 # include "netinet/ip_h323_pxy.c" 105 # include "netinet/ip_netbios_pxy.c" 106 #endif 107 #include "netinet/ip_ipsec_pxy.c" 108 #include "netinet/ip_rpcb_pxy.c" 109 110 /* END OF INCLUDES */ 111 112 #if !defined(lint) 113 static const char rcsid[] = "@(#)$Id: ip_proxy.c,v 2.62.2.14 2005/06/18 02:41:33 darrenr Exp $"; 114 #endif 115 116 static int appr_fixseqack __P((fr_info_t *, ip_t *, ap_session_t *, int )); 117 118 #define AP_SESS_SIZE 53 119 120 #if defined(_KERNEL) 121 int ipf_proxy_debug = 0; 122 #else 123 int ipf_proxy_debug = 2; 124 #endif 125 126 static aproxy_t lcl_ap_proxies[] = { 127 #ifdef IPF_FTP_PROXY 128 { NULL, "ftp", (char)IPPROTO_TCP, 0, 0, NULL, ippr_ftp_init, ippr_ftp_fini, 129 ippr_ftp_new, NULL, ippr_ftp_in, ippr_ftp_out, NULL }, 130 #endif 131 #ifdef IPF_IRC_PROXY 132 { NULL, "irc", (char)IPPROTO_TCP, 0, 0, NULL, ippr_irc_init, ippr_irc_fini, 133 ippr_irc_new, NULL, NULL, ippr_irc_out, NULL, NULL }, 134 #endif 135 #ifdef IPF_RCMD_PROXY 136 { NULL, "rcmd", (char)IPPROTO_TCP, 0, 0, NULL, ippr_rcmd_init, ippr_rcmd_fini, 137 ippr_rcmd_new, NULL, ippr_rcmd_in, ippr_rcmd_out, NULL, NULL }, 138 #endif 139 #ifdef IPF_RAUDIO_PROXY 140 { NULL, "raudio", (char)IPPROTO_TCP, 0, 0, NULL, ippr_raudio_init, ippr_raudio_fini, 141 ippr_raudio_new, NULL, ippr_raudio_in, ippr_raudio_out, NULL, NULL }, 142 #endif 143 #ifdef IPF_MSNRPC_PROXY 144 { NULL, "msnrpc", (char)IPPROTO_TCP, 0, 0, NULL, ippr_msnrpc_init, ippr_msnrpc_fini, 145 ippr_msnrpc_new, NULL, ippr_msnrpc_in, ippr_msnrpc_out, NULL, NULL }, 146 #endif 147 #ifdef IPF_NETBIOS_PROXY 148 { NULL, "netbios", (char)IPPROTO_UDP, 0, 0, NULL, ippr_netbios_init, ippr_netbios_fini, 149 NULL, NULL, NULL, ippr_netbios_out, NULL, NULL }, 150 #endif 151 #ifdef IPF_IPSEC_PROXY 152 { NULL, "ipsec", (char)IPPROTO_UDP, 0, 0, NULL, 153 ippr_ipsec_init, ippr_ipsec_fini, ippr_ipsec_new, ippr_ipsec_del, 154 ippr_ipsec_inout, ippr_ipsec_inout, ippr_ipsec_match, NULL }, 155 #endif 156 #ifdef IPF_PPTP_PROXY 157 { NULL, "pptp", (char)IPPROTO_TCP, 0, 0, NULL, 158 ippr_pptp_init, ippr_pptp_fini, ippr_pptp_new, ippr_pptp_del, 159 ippr_pptp_inout, ippr_pptp_inout, NULL, NULL }, 160 #endif 161 #ifdef IPF_H323_PROXY 162 { NULL, "h323", (char)IPPROTO_TCP, 0, 0, NULL, ippr_h323_init, ippr_h323_fini, 163 ippr_h323_new, ippr_h323_del, ippr_h323_in, NULL, NULL }, 164 { NULL, "h245", (char)IPPROTO_TCP, 0, 0, NULL, NULL, NULL, 165 ippr_h245_new, NULL, NULL, ippr_h245_out, NULL }, 166 #endif 167 #ifdef IPF_RPCB_PROXY 168 # if 0 169 { NULL, "rpcbt", (char)IPPROTO_TCP, 0, 0, NULL, 170 ippr_rpcb_init, ippr_rpcb_fini, ippr_rpcb_new, ippr_rpcb_del, 171 ippr_rpcb_in, ippr_rpcb_out, NULL, NULL }, 172 # endif 173 { NULL, "rpcbu", (char)IPPROTO_UDP, 0, 0, NULL, 174 ippr_rpcb_init, ippr_rpcb_fini, ippr_rpcb_new, ippr_rpcb_del, 175 ippr_rpcb_in, ippr_rpcb_out, NULL, NULL }, 176 #endif 177 { NULL, "", '\0', 0, 0, NULL, NULL, NULL, NULL, NULL } 178 }; 179 180 /* 181 * Dynamically add a new kernel proxy. Ensure that it is unique in the 182 * collection compiled in and dynamically added. 183 */ 184 int appr_add(ap, ifs) 185 aproxy_t *ap; 186 ipf_stack_t *ifs; 187 { 188 aproxy_t *a; 189 190 for (a = ifs->ifs_ap_proxies; a->apr_p; a++) 191 if ((a->apr_p == ap->apr_p) && 192 !strncmp(a->apr_label, ap->apr_label, 193 sizeof(ap->apr_label))) { 194 if (ipf_proxy_debug > 1) 195 printf("appr_add: %s/%d already present (B)\n", 196 a->apr_label, a->apr_p); 197 return -1; 198 } 199 200 for (a = ifs->ifs_ap_proxylist; a->apr_p; a = a->apr_next) 201 if ((a->apr_p == ap->apr_p) && 202 !strncmp(a->apr_label, ap->apr_label, 203 sizeof(ap->apr_label))) { 204 if (ipf_proxy_debug > 1) 205 printf("appr_add: %s/%d already present (D)\n", 206 a->apr_label, a->apr_p); 207 return -1; 208 } 209 ap->apr_next = ifs->ifs_ap_proxylist; 210 ifs->ifs_ap_proxylist = ap; 211 if (ap->apr_init != NULL) 212 return (*ap->apr_init)(&ap->apr_private, ifs); 213 214 return 0; 215 } 216 217 218 /* 219 * Check to see if the proxy this control request has come through for 220 * exists, and if it does and it has a control function then invoke that 221 * control function. 222 */ 223 int appr_ctl(ctl, ifs) 224 ap_ctl_t *ctl; 225 ipf_stack_t *ifs; 226 { 227 aproxy_t *a; 228 int error; 229 230 a = appr_lookup(ctl->apc_p, ctl->apc_label, ifs); 231 if (a == NULL) { 232 if (ipf_proxy_debug > 1) 233 printf("appr_ctl: can't find %s/%d\n", 234 ctl->apc_label, ctl->apc_p); 235 error = ESRCH; 236 } else if (a->apr_ctl == NULL) { 237 if (ipf_proxy_debug > 1) 238 printf("appr_ctl: no ctl function for %s/%d\n", 239 ctl->apc_label, ctl->apc_p); 240 error = ENXIO; 241 } else { 242 error = (*a->apr_ctl)(a, ctl, a->apr_private); 243 if ((error != 0) && (ipf_proxy_debug > 1)) 244 printf("appr_ctl: %s/%d ctl error %d\n", 245 a->apr_label, a->apr_p, error); 246 } 247 return error; 248 } 249 250 251 /* 252 * Delete a proxy that has been added dynamically from those available. 253 * If it is in use, return 1 (do not destroy NOW), not in use 0 or -1 254 * if it cannot be matched. 255 */ 256 int appr_del(ap, ifs) 257 aproxy_t *ap; 258 ipf_stack_t *ifs; 259 { 260 aproxy_t *a, **app; 261 262 for (app = &ifs->ifs_ap_proxylist; ((a = *app) != NULL); 263 app = &a->apr_next) 264 if (a == ap) { 265 a->apr_flags |= APR_DELETE; 266 *app = a->apr_next; 267 if (ap->apr_ref != 0) { 268 if (ipf_proxy_debug > 2) 269 printf("appr_del: orphaning %s/%d\n", 270 ap->apr_label, ap->apr_p); 271 return 1; 272 } 273 return 0; 274 } 275 if (ipf_proxy_debug > 1) 276 printf("appr_del: proxy %lx not found\n", (u_long)ap); 277 return -1; 278 } 279 280 281 /* 282 * Return 1 if the packet is a good match against a proxy, else 0. 283 */ 284 int appr_ok(fin, tcp, nat) 285 fr_info_t *fin; 286 tcphdr_t *tcp; 287 ipnat_t *nat; 288 { 289 aproxy_t *apr = nat->in_apr; 290 u_short dport = nat->in_dport; 291 292 if ((apr == NULL) || (apr->apr_flags & APR_DELETE) || 293 (fin->fin_p != apr->apr_p)) 294 return 0; 295 if ((tcp == NULL) && dport) 296 return 0; 297 return 1; 298 } 299 300 301 int appr_ioctl(data, cmd, mode, ifs) 302 caddr_t data; 303 ioctlcmd_t cmd; 304 int mode; 305 ipf_stack_t *ifs; 306 { 307 ap_ctl_t ctl; 308 caddr_t ptr; 309 int error; 310 311 mode = mode; /* LINT */ 312 313 switch (cmd) 314 { 315 case SIOCPROXY : 316 (void) BCOPYIN(data, &ctl, sizeof(ctl)); 317 ptr = NULL; 318 319 if (ctl.apc_dsize > 0) { 320 KMALLOCS(ptr, caddr_t, ctl.apc_dsize); 321 if (ptr == NULL) 322 error = ENOMEM; 323 else { 324 error = copyinptr(ctl.apc_data, ptr, 325 ctl.apc_dsize); 326 if (error == 0) 327 ctl.apc_data = ptr; 328 } 329 } else { 330 ctl.apc_data = NULL; 331 error = 0; 332 } 333 334 if (error == 0) 335 error = appr_ctl(&ctl, ifs); 336 337 if ((ctl.apc_dsize > 0) && (ptr != NULL) && 338 (ctl.apc_data == ptr)) { 339 KFREES(ptr, ctl.apc_dsize); 340 } 341 break; 342 343 default : 344 error = EINVAL; 345 } 346 return error; 347 } 348 349 350 /* 351 * If a proxy has a match function, call that to do extended packet 352 * matching. 353 */ 354 int appr_match(fin, nat) 355 fr_info_t *fin; 356 nat_t *nat; 357 { 358 aproxy_t *apr; 359 ipnat_t *ipn; 360 int result; 361 362 ipn = nat->nat_ptr; 363 if (ipf_proxy_debug > 8) 364 printf("appr_match(%lx,%lx) aps %lx ptr %lx\n", 365 (u_long)fin, (u_long)nat, (u_long)nat->nat_aps, 366 (u_long)ipn); 367 368 if ((fin->fin_flx & (FI_SHORT|FI_BAD)) != 0) { 369 if (ipf_proxy_debug > 0) 370 printf("appr_match: flx 0x%x (BAD|SHORT)\n", 371 fin->fin_flx); 372 return -1; 373 } 374 375 apr = ipn->in_apr; 376 if ((apr == NULL) || (apr->apr_flags & APR_DELETE)) { 377 if (ipf_proxy_debug > 0) 378 printf("appr_match:apr %lx apr_flags 0x%x\n", 379 (u_long)apr, apr ? apr->apr_flags : 0); 380 return -1; 381 } 382 383 if (apr->apr_match != NULL) { 384 result = (*apr->apr_match)(fin, nat->nat_aps, nat, apr->apr_private); 385 if (result != 0) { 386 if (ipf_proxy_debug > 4) 387 printf("appr_match: result %d\n", result); 388 return -1; 389 } 390 } 391 return 0; 392 } 393 394 395 /* 396 * Allocate a new application proxy structure and fill it in with the 397 * relevant details. call the init function once complete, prior to 398 * returning. 399 */ 400 int appr_new(fin, nat) 401 fr_info_t *fin; 402 nat_t *nat; 403 { 404 register ap_session_t *aps; 405 aproxy_t *apr; 406 ipf_stack_t *ifs = fin->fin_ifs; 407 408 if (ipf_proxy_debug > 8) 409 printf("appr_new(%lx,%lx) \n", (u_long)fin, (u_long)nat); 410 411 if ((nat->nat_ptr == NULL) || (nat->nat_aps != NULL)) { 412 if (ipf_proxy_debug > 0) 413 printf("appr_new: nat_ptr %lx nat_aps %lx\n", 414 (u_long)nat->nat_ptr, (u_long)nat->nat_aps); 415 return -1; 416 } 417 418 apr = nat->nat_ptr->in_apr; 419 420 if ((apr->apr_flags & APR_DELETE) || 421 (fin->fin_p != apr->apr_p)) { 422 if (ipf_proxy_debug > 2) 423 printf("appr_new: apr_flags 0x%x p %d/%d\n", 424 apr->apr_flags, fin->fin_p, apr->apr_p); 425 return -1; 426 } 427 428 KMALLOC(aps, ap_session_t *); 429 if (!aps) { 430 if (ipf_proxy_debug > 0) 431 printf("appr_new: malloc failed (%lu)\n", 432 (u_long)sizeof(ap_session_t)); 433 return -1; 434 } 435 436 bzero((char *)aps, sizeof(*aps)); 437 aps->aps_p = fin->fin_p; 438 aps->aps_data = NULL; 439 aps->aps_apr = apr; 440 aps->aps_psiz = 0; 441 if (apr->apr_new != NULL) 442 if ((*apr->apr_new)(fin, aps, nat, apr->apr_private) == -1) { 443 if ((aps->aps_data != NULL) && (aps->aps_psiz != 0)) { 444 KFREES(aps->aps_data, aps->aps_psiz); 445 } 446 KFREE(aps); 447 if (ipf_proxy_debug > 2) 448 printf("appr_new: new(%lx) failed\n", 449 (u_long)apr->apr_new); 450 return -1; 451 } 452 aps->aps_nat = nat; 453 aps->aps_next = ifs->ifs_ap_sess_list; 454 ifs->ifs_ap_sess_list = aps; 455 nat->nat_aps = aps; 456 457 return 0; 458 } 459 460 461 /* 462 * Check to see if a packet should be passed through an active proxy routine 463 * if one has been setup for it. We don't need to check the checksum here if 464 * IPFILTER_CKSUM is defined because if it is, a failed check causes FI_BAD 465 * to be set. 466 */ 467 int appr_check(fin, nat) 468 fr_info_t *fin; 469 nat_t *nat; 470 { 471 #if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6) && defined(ICK_VALID) 472 mb_t *m; 473 int dosum = 1; 474 #endif 475 tcphdr_t *tcp = NULL; 476 udphdr_t *udp = NULL; 477 ap_session_t *aps; 478 aproxy_t *apr; 479 ip_t *ip; 480 short rv; 481 int err; 482 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) 483 u_32_t s1, s2, sd; 484 #endif 485 ipf_stack_t *ifs = fin->fin_ifs; 486 487 #if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6) 488 net_data_t net_data_p; 489 if (fin->fin_v == 4) 490 net_data_p = ifs->ifs_ipf_ipv4; 491 else 492 net_data_p = ifs->ifs_ipf_ipv6; 493 #endif 494 495 if (fin->fin_flx & FI_BAD) { 496 if (ipf_proxy_debug > 0) 497 printf("appr_check: flx 0x%x (BAD)\n", fin->fin_flx); 498 return -1; 499 } 500 501 #ifndef IPFILTER_CKSUM 502 if ((fin->fin_out == 0) && (fr_checkl4sum(fin) == -1)) { 503 if (ipf_proxy_debug > 0) 504 printf("appr_check: l4 checksum failure %d\n", 505 fin->fin_p); 506 if (fin->fin_p == IPPROTO_TCP) 507 ifs->ifs_frstats[fin->fin_out].fr_tcpbad++; 508 return -1; 509 } 510 #endif 511 512 aps = nat->nat_aps; 513 if ((aps != NULL) && (aps->aps_p == fin->fin_p)) { 514 /* 515 * If there is data in this packet to be proxied then try and 516 * get it all into the one buffer, else drop it. 517 */ 518 #if defined(MENTAT) || defined(HAVE_M_PULLDOWN) 519 if ((fin->fin_dlen > 0) && !(fin->fin_flx & FI_COALESCE)) 520 if (fr_coalesce(fin) == -1) { 521 if (ipf_proxy_debug > 0) 522 printf("appr_check: fr_coalesce failed %x\n", fin->fin_flx); 523 return -1; 524 } 525 #endif 526 ip = fin->fin_ip; 527 528 switch (fin->fin_p) 529 { 530 case IPPROTO_TCP : 531 tcp = (tcphdr_t *)fin->fin_dp; 532 533 #if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6) && defined(ICK_VALID) 534 m = fin->fin_qfm; 535 if (dohwcksum && (m->b_ick_flag == ICK_VALID)) 536 dosum = 0; 537 #endif 538 /* 539 * Don't bother the proxy with these...or in fact, 540 * should we free up proxy stuff when seen? 541 */ 542 if ((fin->fin_tcpf & TH_RST) != 0) 543 break; 544 /*FALLTHROUGH*/ 545 case IPPROTO_UDP : 546 udp = (udphdr_t *)fin->fin_dp; 547 break; 548 default : 549 break; 550 } 551 552 apr = aps->aps_apr; 553 err = 0; 554 if (fin->fin_out != 0) { 555 if (apr->apr_outpkt != NULL) 556 err = (*apr->apr_outpkt)(fin, aps, nat, apr->apr_private); 557 } else { 558 if (apr->apr_inpkt != NULL) 559 err = (*apr->apr_inpkt)(fin, aps, nat, apr->apr_private); 560 } 561 562 rv = APR_EXIT(err); 563 if (((ipf_proxy_debug > 0) && (rv != 0)) || 564 (ipf_proxy_debug > 8)) 565 printf("appr_check: out %d err %x rv %d\n", 566 fin->fin_out, err, rv); 567 if (rv == 1) 568 return -1; 569 570 if (rv == 2) { 571 appr_free(apr); 572 nat->nat_aps = NULL; 573 return -1; 574 } 575 576 /* 577 * If err != 0 then the data size of the packet has changed 578 * so we need to recalculate the header checksums for the 579 * packet. 580 * inbound packets always need to be adjusted. 581 */ 582 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) 583 if (err != 0 && (!fin->fin_out || 584 !NET_IS_HCK_L3_FULL(net_data_p, fin->fin_m))) { 585 short adjlen = err & 0xffff; 586 587 s1 = LONG_SUM(ip->ip_len - adjlen); 588 s2 = LONG_SUM(ip->ip_len); 589 CALC_SUMD(s1, s2, sd); 590 fix_outcksum(&ip->ip_sum, sd); 591 } 592 #endif 593 594 /* 595 * For TCP packets, we may need to adjust the sequence and 596 * acknowledgement numbers to reflect changes in size of the 597 * data stream. 598 * 599 * For both TCP and UDP, recalculate the layer 4 checksum, 600 * regardless, as we can't tell (here) if data has been 601 * changed or not. 602 */ 603 if (tcp != NULL) { 604 err = appr_fixseqack(fin, ip, aps, APR_INC(err)); 605 #if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6) 606 if (!fin->fin_out || 607 !NET_IS_HCK_L4_FULL(net_data_p, fin->fin_m) && 608 !NET_IS_HCK_L4_PART(net_data_p, fin->fin_m)) 609 tcp->th_sum = fr_cksum(fin->fin_qfm, ip, 610 IPPROTO_TCP, tcp); 611 #else 612 tcp->th_sum = fr_cksum(fin->fin_m, ip, 613 IPPROTO_TCP, tcp); 614 #endif 615 } else if ((udp != NULL) && (udp->uh_sum != 0)) { 616 #if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6) 617 if (!fin->fin_out || 618 !NET_IS_HCK_L4_FULL(net_data_p, fin->fin_m) && 619 !NET_IS_HCK_L4_PART(net_data_p, fin->fin_m)) 620 udp->uh_sum = fr_cksum(fin->fin_qfm, ip, 621 IPPROTO_UDP, udp); 622 #else 623 udp->uh_sum = fr_cksum(fin->fin_m, ip, 624 IPPROTO_UDP, udp); 625 #endif 626 } 627 aps->aps_bytes += fin->fin_plen; 628 aps->aps_pkts++; 629 return 1; 630 } 631 return 0; 632 } 633 634 635 /* 636 * Search for an proxy by the protocol it is being used with and its name. 637 */ 638 aproxy_t *appr_lookup(pr, name, ifs) 639 u_int pr; 640 char *name; 641 ipf_stack_t *ifs; 642 { 643 aproxy_t *ap; 644 645 if (ipf_proxy_debug > 8) 646 printf("appr_lookup(%d,%s)\n", pr, name); 647 648 for (ap = ifs->ifs_ap_proxies; ap->apr_p; ap++) 649 if ((ap->apr_p == pr) && 650 !strncmp(name, ap->apr_label, sizeof(ap->apr_label))) { 651 ap->apr_ref++; 652 return ap; 653 } 654 655 for (ap = ifs->ifs_ap_proxylist; ap; ap = ap->apr_next) 656 if ((ap->apr_p == pr) && 657 !strncmp(name, ap->apr_label, sizeof(ap->apr_label))) { 658 ap->apr_ref++; 659 return ap; 660 } 661 if (ipf_proxy_debug > 2) 662 printf("appr_lookup: failed for %d/%s\n", pr, name); 663 return NULL; 664 } 665 666 667 void appr_free(ap) 668 aproxy_t *ap; 669 { 670 ap->apr_ref--; 671 } 672 673 674 void aps_free(aps, ifs) 675 ap_session_t *aps; 676 ipf_stack_t *ifs; 677 { 678 ap_session_t *a, **ap; 679 aproxy_t *apr; 680 681 if (!aps) 682 return; 683 684 for (ap = &ifs->ifs_ap_sess_list; ((a = *ap) != NULL); ap = &a->aps_next) 685 if (a == aps) { 686 *ap = a->aps_next; 687 break; 688 } 689 690 apr = aps->aps_apr; 691 if ((apr != NULL) && (apr->apr_del != NULL)) 692 (*apr->apr_del)(aps, apr->apr_private, ifs); 693 694 if ((aps->aps_data != NULL) && (aps->aps_psiz != 0)) 695 KFREES(aps->aps_data, aps->aps_psiz); 696 KFREE(aps); 697 } 698 699 700 /* 701 * returns 2 if ack or seq number in TCP header is changed, returns 0 otherwise 702 */ 703 static int appr_fixseqack(fin, ip, aps, inc) 704 fr_info_t *fin; 705 ip_t *ip; 706 ap_session_t *aps; 707 int inc; 708 { 709 int sel, ch = 0, out, nlen; 710 u_32_t seq1, seq2; 711 tcphdr_t *tcp; 712 short inc2; 713 714 tcp = (tcphdr_t *)fin->fin_dp; 715 out = fin->fin_out; 716 /* 717 * ip_len has already been adjusted by 'inc'. 718 */ 719 nlen = ip->ip_len; 720 nlen -= (IP_HL(ip) << 2) + (TCP_OFF(tcp) << 2); 721 722 inc2 = inc; 723 inc = (int)inc2; 724 725 if (out != 0) { 726 seq1 = (u_32_t)ntohl(tcp->th_seq); 727 sel = aps->aps_sel[out]; 728 729 /* switch to other set ? */ 730 if ((aps->aps_seqmin[!sel] > aps->aps_seqmin[sel]) && 731 (seq1 > aps->aps_seqmin[!sel])) { 732 if (ipf_proxy_debug > 7) 733 printf("proxy out switch set seq %d -> %d %x > %x\n", 734 sel, !sel, seq1, 735 aps->aps_seqmin[!sel]); 736 sel = aps->aps_sel[out] = !sel; 737 } 738 739 if (aps->aps_seqoff[sel]) { 740 seq2 = aps->aps_seqmin[sel] - aps->aps_seqoff[sel]; 741 if (seq1 > seq2) { 742 seq2 = aps->aps_seqoff[sel]; 743 seq1 += seq2; 744 tcp->th_seq = htonl(seq1); 745 ch = 1; 746 } 747 } 748 749 if (inc && (seq1 > aps->aps_seqmin[!sel])) { 750 aps->aps_seqmin[sel] = seq1 + nlen - 1; 751 aps->aps_seqoff[sel] = aps->aps_seqoff[sel] + inc; 752 if (ipf_proxy_debug > 7) 753 printf("proxy seq set %d at %x to %d + %d\n", 754 sel, aps->aps_seqmin[sel], 755 aps->aps_seqoff[sel], inc); 756 } 757 758 /***/ 759 760 seq1 = ntohl(tcp->th_ack); 761 sel = aps->aps_sel[1 - out]; 762 763 /* switch to other set ? */ 764 if ((aps->aps_ackmin[!sel] > aps->aps_ackmin[sel]) && 765 (seq1 > aps->aps_ackmin[!sel])) { 766 if (ipf_proxy_debug > 7) 767 printf("proxy out switch set ack %d -> %d %x > %x\n", 768 sel, !sel, seq1, 769 aps->aps_ackmin[!sel]); 770 sel = aps->aps_sel[1 - out] = !sel; 771 } 772 773 if (aps->aps_ackoff[sel] && (seq1 > aps->aps_ackmin[sel])) { 774 seq2 = aps->aps_ackoff[sel]; 775 tcp->th_ack = htonl(seq1 - seq2); 776 ch = 1; 777 } 778 } else { 779 seq1 = ntohl(tcp->th_seq); 780 sel = aps->aps_sel[out]; 781 782 /* switch to other set ? */ 783 if ((aps->aps_ackmin[!sel] > aps->aps_ackmin[sel]) && 784 (seq1 > aps->aps_ackmin[!sel])) { 785 if (ipf_proxy_debug > 7) 786 printf("proxy in switch set ack %d -> %d %x > %x\n", 787 sel, !sel, seq1, aps->aps_ackmin[!sel]); 788 sel = aps->aps_sel[out] = !sel; 789 } 790 791 if (aps->aps_ackoff[sel]) { 792 seq2 = aps->aps_ackmin[sel] - aps->aps_ackoff[sel]; 793 if (seq1 > seq2) { 794 seq2 = aps->aps_ackoff[sel]; 795 seq1 += seq2; 796 tcp->th_seq = htonl(seq1); 797 ch = 1; 798 } 799 } 800 801 if (inc && (seq1 > aps->aps_ackmin[!sel])) { 802 aps->aps_ackmin[!sel] = seq1 + nlen - 1; 803 aps->aps_ackoff[!sel] = aps->aps_ackoff[sel] + inc; 804 805 if (ipf_proxy_debug > 7) 806 printf("proxy ack set %d at %x to %d + %d\n", 807 !sel, aps->aps_seqmin[!sel], 808 aps->aps_seqoff[sel], inc); 809 } 810 811 /***/ 812 813 seq1 = ntohl(tcp->th_ack); 814 sel = aps->aps_sel[1 - out]; 815 816 /* switch to other set ? */ 817 if ((aps->aps_seqmin[!sel] > aps->aps_seqmin[sel]) && 818 (seq1 > aps->aps_seqmin[!sel])) { 819 if (ipf_proxy_debug > 7) 820 printf("proxy in switch set seq %d -> %d %x > %x\n", 821 sel, !sel, seq1, aps->aps_seqmin[!sel]); 822 sel = aps->aps_sel[1 - out] = !sel; 823 } 824 825 if (aps->aps_seqoff[sel] != 0) { 826 if (ipf_proxy_debug > 7) 827 printf("sel %d seqoff %d seq1 %x seqmin %x\n", 828 sel, aps->aps_seqoff[sel], seq1, 829 aps->aps_seqmin[sel]); 830 if (seq1 > aps->aps_seqmin[sel]) { 831 seq2 = aps->aps_seqoff[sel]; 832 tcp->th_ack = htonl(seq1 - seq2); 833 ch = 1; 834 } 835 } 836 } 837 838 if (ipf_proxy_debug > 8) 839 printf("appr_fixseqack: seq %x ack %x\n", 840 ntohl(tcp->th_seq), ntohl(tcp->th_ack)); 841 return ch ? 2 : 0; 842 } 843 844 845 /* 846 * Initialise hook for kernel application proxies. 847 * Call the initialise routine for all the compiled in kernel proxies. 848 */ 849 int appr_init(ifs) 850 ipf_stack_t *ifs; 851 { 852 aproxy_t *ap; 853 int err = 0; 854 855 /* Since the refcnt is used we make a copy of lcl_ap_proxies */ 856 KMALLOCS(ifs->ifs_ap_proxies, aproxy_t *, sizeof (lcl_ap_proxies)); 857 bcopy(lcl_ap_proxies, ifs->ifs_ap_proxies, sizeof (lcl_ap_proxies)); 858 859 for (ap = ifs->ifs_ap_proxies; ap->apr_p; ap++) { 860 if (ap->apr_init != NULL) { 861 err = (*ap->apr_init)(&ap->apr_private, ifs); 862 if (err != 0) 863 break; 864 } 865 } 866 return 0; 867 } 868 869 870 /* 871 * Unload hook for kernel application proxies. 872 * Call the finialise routine for all the compiled in kernel proxies. 873 */ 874 void appr_unload(ifs) 875 ipf_stack_t *ifs; 876 { 877 aproxy_t *ap; 878 if(ifs->ifs_ap_proxies == NULL) 879 return; 880 881 for (ap = ifs->ifs_ap_proxies; ap->apr_p; ap++) 882 if (ap->apr_fini != NULL) 883 (*ap->apr_fini)(&ap->apr_private, ifs); 884 for (ap = ifs->ifs_ap_proxylist; ap; ap = ap->apr_next) 885 if (ap->apr_fini != NULL) 886 (*ap->apr_fini)(&ap->apr_private, ifs); 887 888 KFREES(ifs->ifs_ap_proxies, sizeof (lcl_ap_proxies)); 889 ifs->ifs_ap_proxies = NULL; 890 } 891