ip_netbios_pxy.c revision 1.2.4.2
1 1.2.4.2 yamt /* $NetBSD: ip_netbios_pxy.c,v 1.2.4.2 2012/04/17 00:08:16 yamt Exp $ */ 2 1.2.4.2 yamt 3 1.2.4.2 yamt /* 4 1.2.4.2 yamt * Simple netbios-dgm transparent proxy for in-kernel use. 5 1.2.4.2 yamt * For use with the NAT code. 6 1.2.4.2 yamt * Id: ip_netbios_pxy.c,v 2.11 2008/08/10 05:51:12 darrenr Exp 7 1.2.4.2 yamt */ 8 1.2.4.2 yamt 9 1.2.4.2 yamt /*- 10 1.2.4.2 yamt * Copyright (c) 2002-2003 Paul J. Ledbetter III 11 1.2.4.2 yamt * All rights reserved. 12 1.2.4.2 yamt * 13 1.2.4.2 yamt * Redistribution and use in source and binary forms, with or without 14 1.2.4.2 yamt * modification, are permitted provided that the following conditions 15 1.2.4.2 yamt * are met: 16 1.2.4.2 yamt * 1. Redistributions of source code must retain the above copyright 17 1.2.4.2 yamt * notice, this list of conditions and the following disclaimer. 18 1.2.4.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 19 1.2.4.2 yamt * notice, this list of conditions and the following disclaimer in the 20 1.2.4.2 yamt * documentation and/or other materials provided with the distribution. 21 1.2.4.2 yamt * 22 1.2.4.2 yamt * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23 1.2.4.2 yamt * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 1.2.4.2 yamt * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 1.2.4.2 yamt * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26 1.2.4.2 yamt * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 1.2.4.2 yamt * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 1.2.4.2 yamt * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 1.2.4.2 yamt * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 1.2.4.2 yamt * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 1.2.4.2 yamt * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 1.2.4.2 yamt * SUCH DAMAGE. 33 1.2.4.2 yamt * 34 1.2.4.2 yamt * Id: ip_netbios_pxy.c,v 2.11 2008/08/10 05:51:12 darrenr Exp 35 1.2.4.2 yamt */ 36 1.2.4.2 yamt 37 1.2.4.2 yamt #include <sys/cdefs.h> 38 1.2.4.2 yamt __KERNEL_RCSID(1, "$NetBSD: ip_netbios_pxy.c,v 1.2.4.2 2012/04/17 00:08:16 yamt Exp $"); 39 1.2.4.2 yamt 40 1.2.4.2 yamt #define IPF_NETBIOS_PROXY 41 1.2.4.2 yamt 42 1.2.4.2 yamt void ipf_p_netbios_main_load(void); 43 1.2.4.2 yamt void ipf_p_netbios_main_unload(void); 44 1.2.4.2 yamt int ipf_p_netbios_out(void *, fr_info_t *, ap_session_t *, nat_t *); 45 1.2.4.2 yamt 46 1.2.4.2 yamt static frentry_t netbiosfr; 47 1.2.4.2 yamt 48 1.2.4.2 yamt int netbios_proxy_init = 0; 49 1.2.4.2 yamt 50 1.2.4.2 yamt /* 51 1.2.4.2 yamt * Initialize local structures. 52 1.2.4.2 yamt */ 53 1.2.4.2 yamt void 54 1.2.4.2 yamt ipf_p_netbios_main_load(void) 55 1.2.4.2 yamt { 56 1.2.4.2 yamt bzero((char *)&netbiosfr, sizeof(netbiosfr)); 57 1.2.4.2 yamt netbiosfr.fr_ref = 1; 58 1.2.4.2 yamt netbiosfr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE; 59 1.2.4.2 yamt MUTEX_INIT(&netbiosfr.fr_lock, "NETBIOS proxy rule lock"); 60 1.2.4.2 yamt netbios_proxy_init = 1; 61 1.2.4.2 yamt } 62 1.2.4.2 yamt 63 1.2.4.2 yamt 64 1.2.4.2 yamt void 65 1.2.4.2 yamt ipf_p_netbios_main_unload(void) 66 1.2.4.2 yamt { 67 1.2.4.2 yamt if (netbios_proxy_init == 1) { 68 1.2.4.2 yamt MUTEX_DESTROY(&netbiosfr.fr_lock); 69 1.2.4.2 yamt netbios_proxy_init = 0; 70 1.2.4.2 yamt } 71 1.2.4.2 yamt } 72 1.2.4.2 yamt 73 1.2.4.2 yamt 74 1.2.4.2 yamt int 75 1.2.4.2 yamt ipf_p_netbios_out(void *arg, fr_info_t *fin, ap_session_t *aps, nat_t *nat) 76 1.2.4.2 yamt { 77 1.2.4.2 yamt char dgmbuf[6]; 78 1.2.4.2 yamt int off, dlen; 79 1.2.4.2 yamt udphdr_t *udp; 80 1.2.4.2 yamt ip_t *ip; 81 1.2.4.2 yamt mb_t *m; 82 1.2.4.2 yamt 83 1.2.4.2 yamt aps = aps; /* LINT */ 84 1.2.4.2 yamt nat = nat; /* LINT */ 85 1.2.4.2 yamt 86 1.2.4.2 yamt m = fin->fin_m; 87 1.2.4.2 yamt dlen = fin->fin_dlen - sizeof(*udp); 88 1.2.4.2 yamt /* 89 1.2.4.2 yamt * no net bios datagram could possibly be shorter than this 90 1.2.4.2 yamt */ 91 1.2.4.2 yamt if (dlen < 11) 92 1.2.4.2 yamt return 0; 93 1.2.4.2 yamt 94 1.2.4.2 yamt ip = fin->fin_ip; 95 1.2.4.2 yamt udp = (udphdr_t *)fin->fin_dp; 96 1.2.4.2 yamt off = (char *)udp - (char *)ip + sizeof(*udp) + fin->fin_ipoff; 97 1.2.4.2 yamt 98 1.2.4.2 yamt /* 99 1.2.4.2 yamt * move past the 100 1.2.4.2 yamt * ip header; 101 1.2.4.2 yamt * udp header; 102 1.2.4.2 yamt * 4 bytes into the net bios dgm header. 103 1.2.4.2 yamt * According to rfc1002, this should be the exact location of 104 1.2.4.2 yamt * the source address/port 105 1.2.4.2 yamt */ 106 1.2.4.2 yamt off += 4; 107 1.2.4.2 yamt 108 1.2.4.2 yamt /* Copy NATed source Address/port*/ 109 1.2.4.2 yamt dgmbuf[0] = (char)((ip->ip_src.s_addr ) &0xFF); 110 1.2.4.2 yamt dgmbuf[1] = (char)((ip->ip_src.s_addr >> 8) &0xFF); 111 1.2.4.2 yamt dgmbuf[2] = (char)((ip->ip_src.s_addr >> 16)&0xFF); 112 1.2.4.2 yamt dgmbuf[3] = (char)((ip->ip_src.s_addr >> 24)&0xFF); 113 1.2.4.2 yamt 114 1.2.4.2 yamt dgmbuf[4] = (char)((udp->uh_sport )&0xFF); 115 1.2.4.2 yamt dgmbuf[5] = (char)((udp->uh_sport >> 8)&0xFF); 116 1.2.4.2 yamt 117 1.2.4.2 yamt /* replace data in packet */ 118 1.2.4.2 yamt COPYBACK(m, off, sizeof(dgmbuf), dgmbuf); 119 1.2.4.2 yamt 120 1.2.4.2 yamt return 0; 121 1.2.4.2 yamt } 122
Indexes created Mon Oct 20 15:10:11 GMT 2025