1/*
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 2005/07/15 21:56:51 darrenr Exp $
5 */
6
7/*-
8 * Copyright (c) 2002-2003 Paul J. Ledbetter III
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
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.
19 *
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
30 * SUCH DAMAGE.
31 *
32 * $Id: ip_netbios_pxy.c,v 2.8.2.1 2005/07/15 21:56:51 darrenr Exp $
33 *
34 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
35 * Use is subject to license terms.
36 */
37
38#pragma ident	"%Z%%M%	%I%	%E% SMI"
39
40#define	IPF_NETBIOS_PROXY
41
42typedef struct ifs_netbiospxy {
43	frentry_t	netbiosfr;
44	int		netbios_proxy_init;
45} ifs_netbiospxy_t;
46
47int ippr_netbios_init __P((void **, ipf_stack_t *));
48void ippr_netbios_fini __P((void **, ipf_stack_t *));
49int ippr_netbios_out __P((fr_info_t *, ap_session_t *, nat_t *, void *));
50
51/*
52 * Initialize local structures.
53 */
54/*ARGSUSED*/
55int ippr_netbios_init(private, ifs)
56void **private;
57ipf_stack_t *ifs;
58{
59	ifs_netbiospxy_t *ifsnetbios;
60
61	KMALLOC(ifsnetbios, ifs_netbiospxy_t *);
62	if (ifsnetbios == NULL)
63		return -1;
64
65	bzero((char *)&ifsnetbios->netbiosfr, sizeof(ifsnetbios->netbiosfr));
66	ifsnetbios->netbiosfr.fr_ref = 1;
67	ifsnetbios->netbiosfr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE;
68	MUTEX_INIT(&ifsnetbios->netbiosfr.fr_lock, "NETBIOS proxy rule lock");
69	ifsnetbios->netbios_proxy_init = 1;
70
71	*private = (void *)ifsnetbios;
72
73	return 0;
74}
75
76
77/*ARGSUSED*/
78void ippr_netbios_fini(private, ifs)
79void **private;
80ipf_stack_t *ifs;
81{
82	ifs_netbiospxy_t *ifsnetbios = *((ifs_netbiospxy_t **)private);
83
84	if (ifsnetbios->netbios_proxy_init == 1) {
85		MUTEX_DESTROY(&ifsnetbios->netbiosfr.fr_lock);
86		ifsnetbios->netbios_proxy_init = 0;
87	}
88
89	KFREE(ifsnetbios);
90	*private = NULL;
91}
92
93
94/*ARGSUSED*/
95int ippr_netbios_out(fin, aps, nat, private)
96fr_info_t *fin;
97ap_session_t *aps;
98nat_t *nat;
99void *private;
100{
101	char dgmbuf[6];
102	int off, dlen;
103	udphdr_t *udp;
104	ip_t *ip;
105	mb_t *m;
106
107	aps = aps;	/* LINT */
108	nat = nat;	/* LINT */
109
110	m = fin->fin_m;
111	dlen = fin->fin_dlen - sizeof(*udp);
112	/*
113	 * no net bios datagram could possibly be shorter than this
114	 */
115	if (dlen < 11)
116		return 0;
117
118	ip = fin->fin_ip;
119	udp = (udphdr_t *)fin->fin_dp;
120	off = (char *)udp - (char *)ip + sizeof(*udp) + fin->fin_ipoff;
121
122	/*
123	 * move past the
124	 *	ip header;
125	 *	udp header;
126	 *	4 bytes into the net bios dgm header.
127	 *  According to rfc1002, this should be the exact location of
128	 *  the source address/port
129	 */
130	off += 4;
131
132	/* Copy NATed source Address/port*/
133	dgmbuf[0] = (char)((ip->ip_src.s_addr     ) &0xFF);
134	dgmbuf[1] = (char)((ip->ip_src.s_addr >> 8) &0xFF);
135	dgmbuf[2] = (char)((ip->ip_src.s_addr >> 16)&0xFF);
136	dgmbuf[3] = (char)((ip->ip_src.s_addr >> 24)&0xFF);
137
138	dgmbuf[4] = (char)((udp->uh_sport     )&0xFF);
139	dgmbuf[5] = (char)((udp->uh_sport >> 8)&0xFF);
140
141	/* replace data in packet */
142	COPYBACK(m, off, sizeof(dgmbuf), dgmbuf);
143
144	return 0;
145}
146