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 #define IPF_NETBIOS_PROXY
39
40 typedef struct ifs_netbiospxy {
41 frentry_t netbiosfr;
42 int netbios_proxy_init;
43 } ifs_netbiospxy_t;
44
45 int ippr_netbios_init __P((void **, ipf_stack_t *));
46 void ippr_netbios_fini __P((void **, ipf_stack_t *));
47 int ippr_netbios_out __P((fr_info_t *, ap_session_t *, nat_t *, void *));
48
49 /*
50 * Initialize local structures.
51 */
52 /*ARGSUSED*/
ippr_netbios_init(private,ifs)53 int ippr_netbios_init(private, ifs)
54 void **private;
55 ipf_stack_t *ifs;
56 {
57 ifs_netbiospxy_t *ifsnetbios;
58
59 KMALLOC(ifsnetbios, ifs_netbiospxy_t *);
60 if (ifsnetbios == NULL)
61 return -1;
62
63 bzero((char *)&ifsnetbios->netbiosfr, sizeof(ifsnetbios->netbiosfr));
64 ifsnetbios->netbiosfr.fr_ref = 1;
65 ifsnetbios->netbiosfr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE;
66 MUTEX_INIT(&ifsnetbios->netbiosfr.fr_lock, "NETBIOS proxy rule lock");
67 ifsnetbios->netbios_proxy_init = 1;
68
69 *private = (void *)ifsnetbios;
70
71 return 0;
72 }
73
74
75 /*ARGSUSED*/
ippr_netbios_fini(private,ifs)76 void ippr_netbios_fini(private, ifs)
77 void **private;
78 ipf_stack_t *ifs;
79 {
80 ifs_netbiospxy_t *ifsnetbios = *((ifs_netbiospxy_t **)private);
81
82 if (ifsnetbios->netbios_proxy_init == 1) {
83 MUTEX_DESTROY(&ifsnetbios->netbiosfr.fr_lock);
84 ifsnetbios->netbios_proxy_init = 0;
85 }
86
87 KFREE(ifsnetbios);
88 *private = NULL;
89 }
90
91
92 /*ARGSUSED*/
ippr_netbios_out(fin,aps,nat,private)93 int ippr_netbios_out(fin, aps, nat, private)
94 fr_info_t *fin;
95 ap_session_t *aps;
96 nat_t *nat;
97 void *private;
98 {
99 char dgmbuf[6];
100 int off, dlen;
101 udphdr_t *udp;
102 ip_t *ip;
103 mb_t *m;
104
105 aps = aps; /* LINT */
106 nat = nat; /* LINT */
107
108 m = fin->fin_m;
109 dlen = fin->fin_dlen - sizeof(*udp);
110 /*
111 * no net bios datagram could possibly be shorter than this
112 */
113 if (dlen < 11)
114 return 0;
115
116 ip = fin->fin_ip;
117 udp = (udphdr_t *)fin->fin_dp;
118 off = (char *)udp - (char *)ip + sizeof(*udp) + fin->fin_ipoff;
119
120 /*
121 * move past the
122 * ip header;
123 * udp header;
124 * 4 bytes into the net bios dgm header.
125 * According to rfc1002, this should be the exact location of
126 * the source address/port
127 */
128 off += 4;
129
130 /* Copy NATed source Address/port*/
131 dgmbuf[0] = (char)((ip->ip_src.s_addr ) &0xFF);
132 dgmbuf[1] = (char)((ip->ip_src.s_addr >> 8) &0xFF);
133 dgmbuf[2] = (char)((ip->ip_src.s_addr >> 16)&0xFF);
134 dgmbuf[3] = (char)((ip->ip_src.s_addr >> 24)&0xFF);
135
136 dgmbuf[4] = (char)((udp->uh_sport )&0xFF);
137 dgmbuf[5] = (char)((udp->uh_sport >> 8)&0xFF);
138
139 /* replace data in packet */
140 COPYBACK(m, off, sizeof(dgmbuf), dgmbuf);
141
142 return 0;
143 }
144