2 * Simple netbios-dgm transparent proxy for in-kernel use.
3 * For use with the NAT code.
4 * $Id: ip_netbios_pxy.c,v 2.8.2.1 2005/08/20 13:48:23 darrenr Exp $
8 * Copyright (c) 2002-2003 Paul J. Ledbetter III
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * $Id: ip_netbios_pxy.c,v 2.8.2.1 2005/08/20 13:48:23 darrenr Exp $
35 #define IPF_NETBIOS_PROXY
37 int ippr_netbios_init __P((void));
38 void ippr_netbios_fini __P((void));
39 int ippr_netbios_out __P((fr_info_t *, ap_session_t *, nat_t *));
41 static frentry_t netbiosfr;
43 int netbios_proxy_init = 0;
46 * Initialize local structures.
48 int ippr_netbios_init()
50 bzero((char *)&netbiosfr, sizeof(netbiosfr));
52 netbiosfr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE;
53 MUTEX_INIT(&netbiosfr.fr_lock, "NETBIOS proxy rule lock");
54 netbios_proxy_init = 1;
60 void ippr_netbios_fini()
62 if (netbios_proxy_init == 1) {
63 MUTEX_DESTROY(&netbiosfr.fr_lock);
64 netbios_proxy_init = 0;
69 int ippr_netbios_out(fin, aps, nat)
84 dlen = fin->fin_dlen - sizeof(*udp);
86 * no net bios datagram could possibly be shorter than this
92 udp = (udphdr_t *)fin->fin_dp;
93 off = (char *)udp - (char *)ip + sizeof(*udp) + fin->fin_ipoff;
99 * 4 bytes into the net bios dgm header.
100 * According to rfc1002, this should be the exact location of
101 * the source address/port
105 /* Copy NATed source Address/port*/
106 dgmbuf[0] = (char)((ip->ip_src.s_addr ) &0xFF);
107 dgmbuf[1] = (char)((ip->ip_src.s_addr >> 8) &0xFF);
108 dgmbuf[2] = (char)((ip->ip_src.s_addr >> 16)&0xFF);
109 dgmbuf[3] = (char)((ip->ip_src.s_addr >> 24)&0xFF);
111 dgmbuf[4] = (char)((udp->uh_sport )&0xFF);
112 dgmbuf[5] = (char)((udp->uh_sport >> 8)&0xFF);
114 /* replace data in packet */
115 COPYBACK(m, off, sizeof(dgmbuf), dgmbuf);