17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * Simple netbios-dgm transparent proxy for in-kernel use. 37c478bd9Sstevel@tonic-gate * For use with the NAT code. 4ab25eeb5Syz * $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 * 32ab25eeb5Syz * $Id: ip_netbios_pxy.c,v 2.8.2.1 2005/07/15 21:56:51 darrenr Exp $ 33*f4b3ec61Sdh * 34*f4b3ec61Sdh * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 35*f4b3ec61Sdh * Use is subject to license terms. 367c478bd9Sstevel@tonic-gate */ 377c478bd9Sstevel@tonic-gate 38*f4b3ec61Sdh #pragma ident "%Z%%M% %I% %E% SMI" 397c478bd9Sstevel@tonic-gate 40*f4b3ec61Sdh #define IPF_NETBIOS_PROXY 417c478bd9Sstevel@tonic-gate 42*f4b3ec61Sdh typedef struct ifs_netbiospxy { 43*f4b3ec61Sdh frentry_t netbiosfr; 44*f4b3ec61Sdh int netbios_proxy_init; 45*f4b3ec61Sdh } ifs_netbiospxy_t; 467c478bd9Sstevel@tonic-gate 47*f4b3ec61Sdh int ippr_netbios_init __P((void **, ipf_stack_t *)); 48*f4b3ec61Sdh void ippr_netbios_fini __P((void **, ipf_stack_t *)); 49*f4b3ec61Sdh int ippr_netbios_out __P((fr_info_t *, ap_session_t *, nat_t *, void *)); 507c478bd9Sstevel@tonic-gate 517c478bd9Sstevel@tonic-gate /* 527c478bd9Sstevel@tonic-gate * Initialize local structures. 537c478bd9Sstevel@tonic-gate */ 54*f4b3ec61Sdh /*ARGSUSED*/ 55*f4b3ec61Sdh int ippr_netbios_init(private, ifs) 56*f4b3ec61Sdh void **private; 57*f4b3ec61Sdh ipf_stack_t *ifs; 587c478bd9Sstevel@tonic-gate { 59*f4b3ec61Sdh ifs_netbiospxy_t *ifsnetbios; 60*f4b3ec61Sdh 61*f4b3ec61Sdh KMALLOC(ifsnetbios, ifs_netbiospxy_t *); 62*f4b3ec61Sdh if (ifsnetbios == NULL) 63*f4b3ec61Sdh return -1; 64*f4b3ec61Sdh 65*f4b3ec61Sdh bzero((char *)&ifsnetbios->netbiosfr, sizeof(ifsnetbios->netbiosfr)); 66*f4b3ec61Sdh ifsnetbios->netbiosfr.fr_ref = 1; 67*f4b3ec61Sdh ifsnetbios->netbiosfr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE; 68*f4b3ec61Sdh MUTEX_INIT(&ifsnetbios->netbiosfr.fr_lock, "NETBIOS proxy rule lock"); 69*f4b3ec61Sdh ifsnetbios->netbios_proxy_init = 1; 70*f4b3ec61Sdh 71*f4b3ec61Sdh *private = (void *)ifsnetbios; 727c478bd9Sstevel@tonic-gate 737c478bd9Sstevel@tonic-gate return 0; 747c478bd9Sstevel@tonic-gate } 757c478bd9Sstevel@tonic-gate 767c478bd9Sstevel@tonic-gate 77*f4b3ec61Sdh /*ARGSUSED*/ 78*f4b3ec61Sdh void ippr_netbios_fini(private, ifs) 79*f4b3ec61Sdh void **private; 80*f4b3ec61Sdh ipf_stack_t *ifs; 817c478bd9Sstevel@tonic-gate { 82*f4b3ec61Sdh ifs_netbiospxy_t *ifsnetbios = *((ifs_netbiospxy_t **)private); 83*f4b3ec61Sdh 84*f4b3ec61Sdh if (ifsnetbios->netbios_proxy_init == 1) { 85*f4b3ec61Sdh MUTEX_DESTROY(&ifsnetbios->netbiosfr.fr_lock); 86*f4b3ec61Sdh ifsnetbios->netbios_proxy_init = 0; 877c478bd9Sstevel@tonic-gate } 88*f4b3ec61Sdh 89*f4b3ec61Sdh KFREE(ifsnetbios); 90*f4b3ec61Sdh *private = NULL; 917c478bd9Sstevel@tonic-gate } 927c478bd9Sstevel@tonic-gate 937c478bd9Sstevel@tonic-gate 94*f4b3ec61Sdh /*ARGSUSED*/ 95*f4b3ec61Sdh int ippr_netbios_out(fin, aps, nat, private) 967c478bd9Sstevel@tonic-gate fr_info_t *fin; 977c478bd9Sstevel@tonic-gate ap_session_t *aps; 987c478bd9Sstevel@tonic-gate nat_t *nat; 99*f4b3ec61Sdh void *private; 1007c478bd9Sstevel@tonic-gate { 1017c478bd9Sstevel@tonic-gate char dgmbuf[6]; 1027c478bd9Sstevel@tonic-gate int off, dlen; 1037c478bd9Sstevel@tonic-gate udphdr_t *udp; 1047c478bd9Sstevel@tonic-gate ip_t *ip; 1057c478bd9Sstevel@tonic-gate mb_t *m; 1067c478bd9Sstevel@tonic-gate 1077c478bd9Sstevel@tonic-gate aps = aps; /* LINT */ 1087c478bd9Sstevel@tonic-gate nat = nat; /* LINT */ 1097c478bd9Sstevel@tonic-gate 110ab25eeb5Syz m = fin->fin_m; 111ab25eeb5Syz dlen = fin->fin_dlen - sizeof(*udp); 1127c478bd9Sstevel@tonic-gate /* 1137c478bd9Sstevel@tonic-gate * no net bios datagram could possibly be shorter than this 1147c478bd9Sstevel@tonic-gate */ 115ab25eeb5Syz if (dlen < 11) 1167c478bd9Sstevel@tonic-gate return 0; 1177c478bd9Sstevel@tonic-gate 118ab25eeb5Syz ip = fin->fin_ip; 1197c478bd9Sstevel@tonic-gate udp = (udphdr_t *)fin->fin_dp; 120ab25eeb5Syz off = (char *)udp - (char *)ip + sizeof(*udp) + fin->fin_ipoff; 1217c478bd9Sstevel@tonic-gate 122ab25eeb5Syz /* 1237c478bd9Sstevel@tonic-gate * move past the 1247c478bd9Sstevel@tonic-gate * ip header; 1257c478bd9Sstevel@tonic-gate * udp header; 126ab25eeb5Syz * 4 bytes into the net bios dgm header. 1277c478bd9Sstevel@tonic-gate * According to rfc1002, this should be the exact location of 1287c478bd9Sstevel@tonic-gate * the source address/port 1297c478bd9Sstevel@tonic-gate */ 1307c478bd9Sstevel@tonic-gate off += 4; 1317c478bd9Sstevel@tonic-gate 1327c478bd9Sstevel@tonic-gate /* Copy NATed source Address/port*/ 1337c478bd9Sstevel@tonic-gate dgmbuf[0] = (char)((ip->ip_src.s_addr ) &0xFF); 1347c478bd9Sstevel@tonic-gate dgmbuf[1] = (char)((ip->ip_src.s_addr >> 8) &0xFF); 1357c478bd9Sstevel@tonic-gate dgmbuf[2] = (char)((ip->ip_src.s_addr >> 16)&0xFF); 1367c478bd9Sstevel@tonic-gate dgmbuf[3] = (char)((ip->ip_src.s_addr >> 24)&0xFF); 1377c478bd9Sstevel@tonic-gate 1387c478bd9Sstevel@tonic-gate dgmbuf[4] = (char)((udp->uh_sport )&0xFF); 1397c478bd9Sstevel@tonic-gate dgmbuf[5] = (char)((udp->uh_sport >> 8)&0xFF); 1407c478bd9Sstevel@tonic-gate 1417c478bd9Sstevel@tonic-gate /* replace data in packet */ 1427c478bd9Sstevel@tonic-gate COPYBACK(m, off, sizeof(dgmbuf), dgmbuf); 1437c478bd9Sstevel@tonic-gate 1447c478bd9Sstevel@tonic-gate return 0; 1457c478bd9Sstevel@tonic-gate } 146