/* $NetBSD: ip_netbios_pxy.c,v 1.3 2012/07/22 14:27:51 darrenr Exp $ */ /* * Simple netbios-dgm transparent proxy for in-kernel use. * For use with the NAT code. * Id: ip_netbios_pxy.c,v 1.1.1.2 2012/07/22 13:45:30 darrenr Exp */ /*- * Copyright (c) 2002-2003 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 1.1.1.2 2012/07/22 13:45:30 darrenr Exp */ #include __KERNEL_RCSID(1, "$NetBSD: ip_netbios_pxy.c,v 1.3 2012/07/22 14:27:51 darrenr Exp $"); #define IPF_NETBIOS_PROXY void ipf_p_netbios_main_load(void); void ipf_p_netbios_main_unload(void); int ipf_p_netbios_out(void *, fr_info_t *, ap_session_t *, nat_t *); static frentry_t netbiosfr; int netbios_proxy_init = 0; /* * Initialize local structures. */ void ipf_p_netbios_main_load(void) { bzero((char *)&netbiosfr, sizeof(netbiosfr)); netbiosfr.fr_ref = 1; netbiosfr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE; MUTEX_INIT(&netbiosfr.fr_lock, "NETBIOS proxy rule lock"); netbios_proxy_init = 1; } void ipf_p_netbios_main_unload(void) { if (netbios_proxy_init == 1) { MUTEX_DESTROY(&netbiosfr.fr_lock); netbios_proxy_init = 0; } } int ipf_p_netbios_out(void *arg, fr_info_t *fin, ap_session_t *aps, nat_t *nat) { char dgmbuf[6]; int off, dlen; udphdr_t *udp; ip_t *ip; mb_t *m; aps = aps; /* LINT */ nat = nat; /* LINT */ m = fin->fin_m; dlen = fin->fin_dlen - sizeof(*udp); /* * no net bios datagram could possibly be shorter than this */ if (dlen < 11) return 0; ip = fin->fin_ip; udp = (udphdr_t *)fin->fin_dp; off = (char *)udp - (char *)ip + sizeof(*udp) + fin->fin_ipoff; /* * 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 */ COPYBACK(m, off, sizeof(dgmbuf), dgmbuf); return 0; }