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*/ 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*/ 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*/ 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