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 42 typedef struct ifs_netbiospxy { 43 frentry_t netbiosfr; 44 int netbios_proxy_init; 45 } ifs_netbiospxy_t; 46 47 int ippr_netbios_init __P((void **, ipf_stack_t *)); 48 void ippr_netbios_fini __P((void **, ipf_stack_t *)); 49 int ippr_netbios_out __P((fr_info_t *, ap_session_t *, nat_t *, void *)); 50 51 /* 52 * Initialize local structures. 53 */ 54 /*ARGSUSED*/ 55 int ippr_netbios_init(private, ifs) 56 void **private; 57 ipf_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*/ 78 void ippr_netbios_fini(private, ifs) 79 void **private; 80 ipf_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*/ 95 int ippr_netbios_out(fin, aps, nat, private) 96 fr_info_t *fin; 97 ap_session_t *aps; 98 nat_t *nat; 99 void *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