/* $NetBSD: ip_netbios_pxy.c,v 1.4 2002/09/19 08:12:53 martti Exp $ */ /* * Simple netbios-dgm transparent proxy for in-kernel use. * For use with the NAT code. * Id: ip_netbios_pxy.c,v 1.1.2.3 2002/01/09 09:28:37 darrenr Exp */ /*- * Copyright (c) 2002 Paul J. Ledbetter III * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * Id: ip_netbios_pxy.c,v 1.1.2.3 2002/01/09 09:28:37 darrenr Exp */ __KERNEL_RCSID(1, "$NetBSD: ip_netbios_pxy.c,v 1.4 2002/09/19 08:12:53 martti Exp $"); #define IPF_NETBIOS_PROXY int ippr_netbios_init __P((void)); int ippr_netbios_out __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *)); static frentry_t netbiosfr; /* * Initialize local structures. */ int ippr_netbios_init() { bzero((char *)&netbiosfr, sizeof(netbiosfr)); netbiosfr.fr_ref = 1; netbiosfr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE; return 0; } int ippr_netbios_out(fin, ip, aps, nat) fr_info_t *fin; ip_t *ip; ap_session_t *aps; nat_t *nat; { char dgmbuf[6]; int off, dlen; udphdr_t *udp; mb_t *m; m = *(mb_t **)fin->fin_mp; off = fin->fin_hlen + sizeof(udphdr_t); #if SOLARIS dlen = msgdsize(m); #else dlen = mbufchainlen(m); #endif dlen -= off; /* * no net bios datagram could possibly be shorter than this */ if (dlen < 11) return 0; udp = (udphdr_t *)fin->fin_dp; /* * move past the * ip header; * udp header; * 4 bytes into the net bios dgm header. * According to rfc1002, this should be the exact location of * the source address/port */ off += 4; /* Copy NATed source Address/port*/ dgmbuf[0] = (char)((ip->ip_src.s_addr ) &0xFF); dgmbuf[1] = (char)((ip->ip_src.s_addr >> 8) &0xFF); dgmbuf[2] = (char)((ip->ip_src.s_addr >> 16)&0xFF); dgmbuf[3] = (char)((ip->ip_src.s_addr >> 24)&0xFF); dgmbuf[4] = (char)((udp->uh_sport )&0xFF); dgmbuf[5] = (char)((udp->uh_sport >> 8)&0xFF); /* replace data in packet */ #if SOLARIS copyin_mblk(m, off, sizeof(dgmbuf), dgmbuf); #else m_copyback(m, off, sizeof(dgmbuf), dgmbuf); #endif return 0; }