17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate * Simple netbios-dgm transparent proxy for in-kernel use.
37c478bd9Sstevel@tonic-gate * For use with the NAT code.
4ab25eeb5Syz * $Id: ip_netbios_pxy.c,v 2.8.2.1 2005/07/15 21:56:51 darrenr Exp $
57c478bd9Sstevel@tonic-gate */
67c478bd9Sstevel@tonic-gate
77c478bd9Sstevel@tonic-gate /*-
87c478bd9Sstevel@tonic-gate * Copyright (c) 2002-2003 Paul J. Ledbetter III
97c478bd9Sstevel@tonic-gate * All rights reserved.
107c478bd9Sstevel@tonic-gate *
117c478bd9Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without
127c478bd9Sstevel@tonic-gate * modification, are permitted provided that the following conditions
137c478bd9Sstevel@tonic-gate * are met:
147c478bd9Sstevel@tonic-gate * 1. Redistributions of source code must retain the above copyright
157c478bd9Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer.
167c478bd9Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright
177c478bd9Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in the
187c478bd9Sstevel@tonic-gate * documentation and/or other materials provided with the distribution.
197c478bd9Sstevel@tonic-gate *
207c478bd9Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
217c478bd9Sstevel@tonic-gate * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
227c478bd9Sstevel@tonic-gate * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
237c478bd9Sstevel@tonic-gate * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
247c478bd9Sstevel@tonic-gate * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
257c478bd9Sstevel@tonic-gate * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
267c478bd9Sstevel@tonic-gate * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
277c478bd9Sstevel@tonic-gate * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
287c478bd9Sstevel@tonic-gate * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
297c478bd9Sstevel@tonic-gate * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
307c478bd9Sstevel@tonic-gate * SUCH DAMAGE.
317c478bd9Sstevel@tonic-gate *
32ab25eeb5Syz * $Id: ip_netbios_pxy.c,v 2.8.2.1 2005/07/15 21:56:51 darrenr Exp $
33*f4b3ec61Sdh *
34*f4b3ec61Sdh * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
35*f4b3ec61Sdh * Use is subject to license terms.
367c478bd9Sstevel@tonic-gate */
377c478bd9Sstevel@tonic-gate
38*f4b3ec61Sdh #define IPF_NETBIOS_PROXY
397c478bd9Sstevel@tonic-gate
40*f4b3ec61Sdh typedef struct ifs_netbiospxy {
41*f4b3ec61Sdh frentry_t netbiosfr;
42*f4b3ec61Sdh int netbios_proxy_init;
43*f4b3ec61Sdh } ifs_netbiospxy_t;
447c478bd9Sstevel@tonic-gate
45*f4b3ec61Sdh int ippr_netbios_init __P((void **, ipf_stack_t *));
46*f4b3ec61Sdh void ippr_netbios_fini __P((void **, ipf_stack_t *));
47*f4b3ec61Sdh int ippr_netbios_out __P((fr_info_t *, ap_session_t *, nat_t *, void *));
487c478bd9Sstevel@tonic-gate
497c478bd9Sstevel@tonic-gate /*
507c478bd9Sstevel@tonic-gate * Initialize local structures.
517c478bd9Sstevel@tonic-gate */
52*f4b3ec61Sdh /*ARGSUSED*/
ippr_netbios_init(private,ifs)53*f4b3ec61Sdh int ippr_netbios_init(private, ifs)
54*f4b3ec61Sdh void **private;
55*f4b3ec61Sdh ipf_stack_t *ifs;
567c478bd9Sstevel@tonic-gate {
57*f4b3ec61Sdh ifs_netbiospxy_t *ifsnetbios;
58*f4b3ec61Sdh
59*f4b3ec61Sdh KMALLOC(ifsnetbios, ifs_netbiospxy_t *);
60*f4b3ec61Sdh if (ifsnetbios == NULL)
61*f4b3ec61Sdh return -1;
62*f4b3ec61Sdh
63*f4b3ec61Sdh bzero((char *)&ifsnetbios->netbiosfr, sizeof(ifsnetbios->netbiosfr));
64*f4b3ec61Sdh ifsnetbios->netbiosfr.fr_ref = 1;
65*f4b3ec61Sdh ifsnetbios->netbiosfr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE;
66*f4b3ec61Sdh MUTEX_INIT(&ifsnetbios->netbiosfr.fr_lock, "NETBIOS proxy rule lock");
67*f4b3ec61Sdh ifsnetbios->netbios_proxy_init = 1;
68*f4b3ec61Sdh
69*f4b3ec61Sdh *private = (void *)ifsnetbios;
707c478bd9Sstevel@tonic-gate
717c478bd9Sstevel@tonic-gate return 0;
727c478bd9Sstevel@tonic-gate }
737c478bd9Sstevel@tonic-gate
747c478bd9Sstevel@tonic-gate
75*f4b3ec61Sdh /*ARGSUSED*/
ippr_netbios_fini(private,ifs)76*f4b3ec61Sdh void ippr_netbios_fini(private, ifs)
77*f4b3ec61Sdh void **private;
78*f4b3ec61Sdh ipf_stack_t *ifs;
797c478bd9Sstevel@tonic-gate {
80*f4b3ec61Sdh ifs_netbiospxy_t *ifsnetbios = *((ifs_netbiospxy_t **)private);
81*f4b3ec61Sdh
82*f4b3ec61Sdh if (ifsnetbios->netbios_proxy_init == 1) {
83*f4b3ec61Sdh MUTEX_DESTROY(&ifsnetbios->netbiosfr.fr_lock);
84*f4b3ec61Sdh ifsnetbios->netbios_proxy_init = 0;
857c478bd9Sstevel@tonic-gate }
86*f4b3ec61Sdh
87*f4b3ec61Sdh KFREE(ifsnetbios);
88*f4b3ec61Sdh *private = NULL;
897c478bd9Sstevel@tonic-gate }
907c478bd9Sstevel@tonic-gate
917c478bd9Sstevel@tonic-gate
92*f4b3ec61Sdh /*ARGSUSED*/
ippr_netbios_out(fin,aps,nat,private)93*f4b3ec61Sdh int ippr_netbios_out(fin, aps, nat, private)
947c478bd9Sstevel@tonic-gate fr_info_t *fin;
957c478bd9Sstevel@tonic-gate ap_session_t *aps;
967c478bd9Sstevel@tonic-gate nat_t *nat;
97*f4b3ec61Sdh void *private;
987c478bd9Sstevel@tonic-gate {
997c478bd9Sstevel@tonic-gate char dgmbuf[6];
1007c478bd9Sstevel@tonic-gate int off, dlen;
1017c478bd9Sstevel@tonic-gate udphdr_t *udp;
1027c478bd9Sstevel@tonic-gate ip_t *ip;
1037c478bd9Sstevel@tonic-gate mb_t *m;
1047c478bd9Sstevel@tonic-gate
1057c478bd9Sstevel@tonic-gate aps = aps; /* LINT */
1067c478bd9Sstevel@tonic-gate nat = nat; /* LINT */
1077c478bd9Sstevel@tonic-gate
108ab25eeb5Syz m = fin->fin_m;
109ab25eeb5Syz dlen = fin->fin_dlen - sizeof(*udp);
1107c478bd9Sstevel@tonic-gate /*
1117c478bd9Sstevel@tonic-gate * no net bios datagram could possibly be shorter than this
1127c478bd9Sstevel@tonic-gate */
113ab25eeb5Syz if (dlen < 11)
1147c478bd9Sstevel@tonic-gate return 0;
1157c478bd9Sstevel@tonic-gate
116ab25eeb5Syz ip = fin->fin_ip;
1177c478bd9Sstevel@tonic-gate udp = (udphdr_t *)fin->fin_dp;
118ab25eeb5Syz off = (char *)udp - (char *)ip + sizeof(*udp) + fin->fin_ipoff;
1197c478bd9Sstevel@tonic-gate
120ab25eeb5Syz /*
1217c478bd9Sstevel@tonic-gate * move past the
1227c478bd9Sstevel@tonic-gate * ip header;
1237c478bd9Sstevel@tonic-gate * udp header;
124ab25eeb5Syz * 4 bytes into the net bios dgm header.
1257c478bd9Sstevel@tonic-gate * According to rfc1002, this should be the exact location of
1267c478bd9Sstevel@tonic-gate * the source address/port
1277c478bd9Sstevel@tonic-gate */
1287c478bd9Sstevel@tonic-gate off += 4;
1297c478bd9Sstevel@tonic-gate
1307c478bd9Sstevel@tonic-gate /* Copy NATed source Address/port*/
1317c478bd9Sstevel@tonic-gate dgmbuf[0] = (char)((ip->ip_src.s_addr ) &0xFF);
1327c478bd9Sstevel@tonic-gate dgmbuf[1] = (char)((ip->ip_src.s_addr >> 8) &0xFF);
1337c478bd9Sstevel@tonic-gate dgmbuf[2] = (char)((ip->ip_src.s_addr >> 16)&0xFF);
1347c478bd9Sstevel@tonic-gate dgmbuf[3] = (char)((ip->ip_src.s_addr >> 24)&0xFF);
1357c478bd9Sstevel@tonic-gate
1367c478bd9Sstevel@tonic-gate dgmbuf[4] = (char)((udp->uh_sport )&0xFF);
1377c478bd9Sstevel@tonic-gate dgmbuf[5] = (char)((udp->uh_sport >> 8)&0xFF);
1387c478bd9Sstevel@tonic-gate
1397c478bd9Sstevel@tonic-gate /* replace data in packet */
1407c478bd9Sstevel@tonic-gate COPYBACK(m, off, sizeof(dgmbuf), dgmbuf);
1417c478bd9Sstevel@tonic-gate
1427c478bd9Sstevel@tonic-gate return 0;
1437c478bd9Sstevel@tonic-gate }
144