125 lines
3.4 KiB
C
125 lines
3.4 KiB
C
/* $NetBSD: ip_netbios_pxy.c,v 1.1 2004/10/02 07:51:53 christos Exp $ */
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/*
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* Simple netbios-dgm transparent proxy for in-kernel use.
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* For use with the NAT code.
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* Id: ip_netbios_pxy.c,v 2.8 2003/12/01 02:52:16 darrenr Exp
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*/
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/*-
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* Copyright (c) 2002-2003 Paul J. Ledbetter III
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Id: ip_netbios_pxy.c,v 2.8 2003/12/01 02:52:16 darrenr Exp
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*/
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__KERNEL_RCSID(1, "$NetBSD: ip_netbios_pxy.c,v 1.1 2004/10/02 07:51:53 christos Exp $");
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#define IPF_NETBIOS_PROXY
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int ippr_netbios_init __P((void));
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void ippr_netbios_fini __P((void));
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int ippr_netbios_out __P((fr_info_t *, ap_session_t *, nat_t *));
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static frentry_t netbiosfr;
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int netbios_proxy_init = 0;
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/*
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* Initialize local structures.
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*/
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int ippr_netbios_init()
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{
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bzero((char *)&netbiosfr, sizeof(netbiosfr));
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netbiosfr.fr_ref = 1;
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netbiosfr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE;
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MUTEX_INIT(&netbiosfr.fr_lock, "NETBIOS proxy rule lock");
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netbios_proxy_init = 1;
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return 0;
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}
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void ippr_netbios_fini()
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{
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if (netbios_proxy_init == 1) {
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MUTEX_DESTROY(&netbiosfr.fr_lock);
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netbios_proxy_init = 0;
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}
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}
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int ippr_netbios_out(fin, aps, nat)
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fr_info_t *fin;
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ap_session_t *aps;
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nat_t *nat;
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{
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char dgmbuf[6];
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int off, dlen;
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udphdr_t *udp;
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ip_t *ip;
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mb_t *m;
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aps = aps; /* LINT */
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nat = nat; /* LINT */
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ip = fin->fin_ip;
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m = *(mb_t **)fin->fin_mp;
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off = fin->fin_hlen + sizeof(udphdr_t);
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dlen = M_LEN(m);
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dlen -= off;
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/*
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* no net bios datagram could possibly be shorter than this
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*/
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if (dlen < 11)
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return 0;
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udp = (udphdr_t *)fin->fin_dp;
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/*
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* move past the
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* ip header;
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* udp header;
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* 4 bytes into the net bios dgm header.
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* According to rfc1002, this should be the exact location of
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* the source address/port
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*/
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off += 4;
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/* Copy NATed source Address/port*/
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dgmbuf[0] = (char)((ip->ip_src.s_addr ) &0xFF);
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dgmbuf[1] = (char)((ip->ip_src.s_addr >> 8) &0xFF);
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dgmbuf[2] = (char)((ip->ip_src.s_addr >> 16)&0xFF);
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dgmbuf[3] = (char)((ip->ip_src.s_addr >> 24)&0xFF);
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dgmbuf[4] = (char)((udp->uh_sport )&0xFF);
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dgmbuf[5] = (char)((udp->uh_sport >> 8)&0xFF);
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/* replace data in packet */
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COPYBACK(m, off, sizeof(dgmbuf), dgmbuf);
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return 0;
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}
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