4 * Simple netbios-dgm transparent proxy for in-kernel use.
5 * For use with the NAT code.
6 * Id: ip_netbios_pxy.c,v 2.8 2003/12/01 02:52:16 darrenr Exp
10 * Copyright (c) 2002-2003 Paul J. Ledbetter III
11 * All rights reserved.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * Id: ip_netbios_pxy.c,v 2.8 2003/12/01 02:52:16 darrenr Exp
37 #define IPF_NETBIOS_PROXY
39 int ippr_netbios_init __P((void));
40 void ippr_netbios_fini __P((void));
41 int ippr_netbios_out __P((fr_info_t *, ap_session_t *, nat_t *));
43 static frentry_t netbiosfr;
45 int netbios_proxy_init = 0;
48 * Initialize local structures.
50 int ippr_netbios_init()
52 bzero((char *)&netbiosfr, sizeof(netbiosfr));
54 netbiosfr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE;
55 MUTEX_INIT(&netbiosfr.fr_lock, "NETBIOS proxy rule lock");
56 netbios_proxy_init = 1;
62 void ippr_netbios_fini()
64 if (netbios_proxy_init == 1) {
65 MUTEX_DESTROY(&netbiosfr.fr_lock);
66 netbios_proxy_init = 0;
71 int ippr_netbios_out(fin, aps, nat)
86 m = *(mb_t **)fin->fin_mp;
87 off = fin->fin_hlen + sizeof(udphdr_t);
92 * no net bios datagram could possibly be shorter than this
97 udp = (udphdr_t *)fin->fin_dp;
103 * 4 bytes into the net bios dgm header.
104 * According to rfc1002, this should be the exact location of
105 * the source address/port
109 /* Copy NATed source Address/port*/
110 dgmbuf[0] = (char)((ip->ip_src.s_addr ) &0xFF);
111 dgmbuf[1] = (char)((ip->ip_src.s_addr >> 8) &0xFF);
112 dgmbuf[2] = (char)((ip->ip_src.s_addr >> 16)&0xFF);
113 dgmbuf[3] = (char)((ip->ip_src.s_addr >> 24)&0xFF);
115 dgmbuf[4] = (char)((udp->uh_sport )&0xFF);
116 dgmbuf[5] = (char)((udp->uh_sport >> 8)&0xFF);
118 /* replace data in packet */
119 COPYBACK(m, off, sizeof(dgmbuf), dgmbuf);