17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * Simple netbios-dgm transparent proxy for in-kernel use. 37c478bd9Sstevel@tonic-gate * For use with the NAT code. 4*ab25eeb5Syz * $Id: ip_netbios_pxy.c,v 2.8.2.1 2005/07/15 21:56:51 darrenr Exp $ 57c478bd9Sstevel@tonic-gate */ 67c478bd9Sstevel@tonic-gate 77c478bd9Sstevel@tonic-gate /*- 87c478bd9Sstevel@tonic-gate * Copyright (c) 2002-2003 Paul J. Ledbetter III 97c478bd9Sstevel@tonic-gate * All rights reserved. 107c478bd9Sstevel@tonic-gate * 117c478bd9Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without 127c478bd9Sstevel@tonic-gate * modification, are permitted provided that the following conditions 137c478bd9Sstevel@tonic-gate * are met: 147c478bd9Sstevel@tonic-gate * 1. Redistributions of source code must retain the above copyright 157c478bd9Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer. 167c478bd9Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright 177c478bd9Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in the 187c478bd9Sstevel@tonic-gate * documentation and/or other materials provided with the distribution. 197c478bd9Sstevel@tonic-gate * 207c478bd9Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 217c478bd9Sstevel@tonic-gate * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 227c478bd9Sstevel@tonic-gate * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 237c478bd9Sstevel@tonic-gate * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 247c478bd9Sstevel@tonic-gate * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 257c478bd9Sstevel@tonic-gate * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 267c478bd9Sstevel@tonic-gate * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 277c478bd9Sstevel@tonic-gate * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 287c478bd9Sstevel@tonic-gate * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 297c478bd9Sstevel@tonic-gate * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 307c478bd9Sstevel@tonic-gate * SUCH DAMAGE. 317c478bd9Sstevel@tonic-gate * 32*ab25eeb5Syz * $Id: ip_netbios_pxy.c,v 2.8.2.1 2005/07/15 21:56:51 darrenr Exp $ 337c478bd9Sstevel@tonic-gate */ 347c478bd9Sstevel@tonic-gate 357c478bd9Sstevel@tonic-gate #define IPF_NETBIOS_PROXY 367c478bd9Sstevel@tonic-gate 377c478bd9Sstevel@tonic-gate int ippr_netbios_init __P((void)); 387c478bd9Sstevel@tonic-gate void ippr_netbios_fini __P((void)); 397c478bd9Sstevel@tonic-gate int ippr_netbios_out __P((fr_info_t *, ap_session_t *, nat_t *)); 407c478bd9Sstevel@tonic-gate 417c478bd9Sstevel@tonic-gate static frentry_t netbiosfr; 427c478bd9Sstevel@tonic-gate 437c478bd9Sstevel@tonic-gate int netbios_proxy_init = 0; 447c478bd9Sstevel@tonic-gate 457c478bd9Sstevel@tonic-gate /* 467c478bd9Sstevel@tonic-gate * Initialize local structures. 477c478bd9Sstevel@tonic-gate */ 487c478bd9Sstevel@tonic-gate int ippr_netbios_init() 497c478bd9Sstevel@tonic-gate { 507c478bd9Sstevel@tonic-gate bzero((char *)&netbiosfr, sizeof(netbiosfr)); 517c478bd9Sstevel@tonic-gate netbiosfr.fr_ref = 1; 527c478bd9Sstevel@tonic-gate netbiosfr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE; 537c478bd9Sstevel@tonic-gate MUTEX_INIT(&netbiosfr.fr_lock, "NETBIOS proxy rule lock"); 547c478bd9Sstevel@tonic-gate netbios_proxy_init = 1; 557c478bd9Sstevel@tonic-gate 567c478bd9Sstevel@tonic-gate return 0; 577c478bd9Sstevel@tonic-gate } 587c478bd9Sstevel@tonic-gate 597c478bd9Sstevel@tonic-gate 607c478bd9Sstevel@tonic-gate void ippr_netbios_fini() 617c478bd9Sstevel@tonic-gate { 627c478bd9Sstevel@tonic-gate if (netbios_proxy_init == 1) { 637c478bd9Sstevel@tonic-gate MUTEX_DESTROY(&netbiosfr.fr_lock); 647c478bd9Sstevel@tonic-gate netbios_proxy_init = 0; 657c478bd9Sstevel@tonic-gate } 667c478bd9Sstevel@tonic-gate } 677c478bd9Sstevel@tonic-gate 687c478bd9Sstevel@tonic-gate 697c478bd9Sstevel@tonic-gate int ippr_netbios_out(fin, aps, nat) 707c478bd9Sstevel@tonic-gate fr_info_t *fin; 717c478bd9Sstevel@tonic-gate ap_session_t *aps; 727c478bd9Sstevel@tonic-gate nat_t *nat; 737c478bd9Sstevel@tonic-gate { 747c478bd9Sstevel@tonic-gate char dgmbuf[6]; 757c478bd9Sstevel@tonic-gate int off, dlen; 767c478bd9Sstevel@tonic-gate udphdr_t *udp; 777c478bd9Sstevel@tonic-gate ip_t *ip; 787c478bd9Sstevel@tonic-gate mb_t *m; 797c478bd9Sstevel@tonic-gate 807c478bd9Sstevel@tonic-gate aps = aps; /* LINT */ 817c478bd9Sstevel@tonic-gate nat = nat; /* LINT */ 827c478bd9Sstevel@tonic-gate 83*ab25eeb5Syz m = fin->fin_m; 84*ab25eeb5Syz dlen = fin->fin_dlen - sizeof(*udp); 857c478bd9Sstevel@tonic-gate /* 867c478bd9Sstevel@tonic-gate * no net bios datagram could possibly be shorter than this 877c478bd9Sstevel@tonic-gate */ 88*ab25eeb5Syz if (dlen < 11) 897c478bd9Sstevel@tonic-gate return 0; 907c478bd9Sstevel@tonic-gate 91*ab25eeb5Syz ip = fin->fin_ip; 927c478bd9Sstevel@tonic-gate udp = (udphdr_t *)fin->fin_dp; 93*ab25eeb5Syz off = (char *)udp - (char *)ip + sizeof(*udp) + fin->fin_ipoff; 947c478bd9Sstevel@tonic-gate 95*ab25eeb5Syz /* 967c478bd9Sstevel@tonic-gate * move past the 977c478bd9Sstevel@tonic-gate * ip header; 987c478bd9Sstevel@tonic-gate * udp header; 99*ab25eeb5Syz * 4 bytes into the net bios dgm header. 1007c478bd9Sstevel@tonic-gate * According to rfc1002, this should be the exact location of 1017c478bd9Sstevel@tonic-gate * the source address/port 1027c478bd9Sstevel@tonic-gate */ 1037c478bd9Sstevel@tonic-gate off += 4; 1047c478bd9Sstevel@tonic-gate 1057c478bd9Sstevel@tonic-gate /* Copy NATed source Address/port*/ 1067c478bd9Sstevel@tonic-gate dgmbuf[0] = (char)((ip->ip_src.s_addr ) &0xFF); 1077c478bd9Sstevel@tonic-gate dgmbuf[1] = (char)((ip->ip_src.s_addr >> 8) &0xFF); 1087c478bd9Sstevel@tonic-gate dgmbuf[2] = (char)((ip->ip_src.s_addr >> 16)&0xFF); 1097c478bd9Sstevel@tonic-gate dgmbuf[3] = (char)((ip->ip_src.s_addr >> 24)&0xFF); 1107c478bd9Sstevel@tonic-gate 1117c478bd9Sstevel@tonic-gate dgmbuf[4] = (char)((udp->uh_sport )&0xFF); 1127c478bd9Sstevel@tonic-gate dgmbuf[5] = (char)((udp->uh_sport >> 8)&0xFF); 1137c478bd9Sstevel@tonic-gate 1147c478bd9Sstevel@tonic-gate /* replace data in packet */ 1157c478bd9Sstevel@tonic-gate COPYBACK(m, off, sizeof(dgmbuf), dgmbuf); 1167c478bd9Sstevel@tonic-gate 1177c478bd9Sstevel@tonic-gate return 0; 1187c478bd9Sstevel@tonic-gate } 119