ip_netbios_pxy.c revision 1.2.2.2
1 1.2.2.2 joerg /* $NetBSD: ip_netbios_pxy.c,v 1.2.2.2 2012/04/17 19:25:20 joerg Exp $ */ 2 1.2.2.2 joerg 3 1.2.2.2 joerg /* 4 1.2.2.2 joerg * Simple netbios-dgm transparent proxy for in-kernel use. 5 1.2.2.2 joerg * For use with the NAT code. 6 1.2.2.2 joerg * Id: ip_netbios_pxy.c,v 2.11 2008/08/10 05:51:12 darrenr Exp 7 1.2.2.2 joerg */ 8 1.2.2.2 joerg 9 1.2.2.2 joerg /*- 10 1.2.2.2 joerg * Copyright (c) 2002-2003 Paul J. Ledbetter III 11 1.2.2.2 joerg * All rights reserved. 12 1.2.2.2 joerg * 13 1.2.2.2 joerg * Redistribution and use in source and binary forms, with or without 14 1.2.2.2 joerg * modification, are permitted provided that the following conditions 15 1.2.2.2 joerg * are met: 16 1.2.2.2 joerg * 1. Redistributions of source code must retain the above copyright 17 1.2.2.2 joerg * notice, this list of conditions and the following disclaimer. 18 1.2.2.2 joerg * 2. Redistributions in binary form must reproduce the above copyright 19 1.2.2.2 joerg * notice, this list of conditions and the following disclaimer in the 20 1.2.2.2 joerg * documentation and/or other materials provided with the distribution. 21 1.2.2.2 joerg * 22 1.2.2.2 joerg * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23 1.2.2.2 joerg * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 1.2.2.2 joerg * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 1.2.2.2 joerg * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26 1.2.2.2 joerg * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 1.2.2.2 joerg * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 1.2.2.2 joerg * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 1.2.2.2 joerg * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 1.2.2.2 joerg * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 1.2.2.2 joerg * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 1.2.2.2 joerg * SUCH DAMAGE. 33 1.2.2.2 joerg * 34 1.2.2.2 joerg * Id: ip_netbios_pxy.c,v 2.11 2008/08/10 05:51:12 darrenr Exp 35 1.2.2.2 joerg */ 36 1.2.2.2 joerg 37 1.2.2.2 joerg #include <sys/cdefs.h> 38 1.2.2.2 joerg __KERNEL_RCSID(1, "$NetBSD: ip_netbios_pxy.c,v 1.2.2.2 2012/04/17 19:25:20 joerg Exp $"); 39 1.2.2.2 joerg 40 1.2.2.2 joerg #define IPF_NETBIOS_PROXY 41 1.2.2.2 joerg 42 1.2.2.2 joerg void ipf_p_netbios_main_load(void); 43 1.2.2.2 joerg void ipf_p_netbios_main_unload(void); 44 1.2.2.2 joerg int ipf_p_netbios_out(void *, fr_info_t *, ap_session_t *, nat_t *); 45 1.2.2.2 joerg 46 1.2.2.2 joerg static frentry_t netbiosfr; 47 1.2.2.2 joerg 48 1.2.2.2 joerg int netbios_proxy_init = 0; 49 1.2.2.2 joerg 50 1.2.2.2 joerg /* 51 1.2.2.2 joerg * Initialize local structures. 52 1.2.2.2 joerg */ 53 1.2.2.2 joerg void 54 1.2.2.2 joerg ipf_p_netbios_main_load(void) 55 1.2.2.2 joerg { 56 1.2.2.2 joerg bzero((char *)&netbiosfr, sizeof(netbiosfr)); 57 1.2.2.2 joerg netbiosfr.fr_ref = 1; 58 1.2.2.2 joerg netbiosfr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE; 59 1.2.2.2 joerg MUTEX_INIT(&netbiosfr.fr_lock, "NETBIOS proxy rule lock"); 60 1.2.2.2 joerg netbios_proxy_init = 1; 61 1.2.2.2 joerg } 62 1.2.2.2 joerg 63 1.2.2.2 joerg 64 1.2.2.2 joerg void 65 1.2.2.2 joerg ipf_p_netbios_main_unload(void) 66 1.2.2.2 joerg { 67 1.2.2.2 joerg if (netbios_proxy_init == 1) { 68 1.2.2.2 joerg MUTEX_DESTROY(&netbiosfr.fr_lock); 69 1.2.2.2 joerg netbios_proxy_init = 0; 70 1.2.2.2 joerg } 71 1.2.2.2 joerg } 72 1.2.2.2 joerg 73 1.2.2.2 joerg 74 1.2.2.2 joerg int 75 1.2.2.2 joerg ipf_p_netbios_out(void *arg, fr_info_t *fin, ap_session_t *aps, nat_t *nat) 76 1.2.2.2 joerg { 77 1.2.2.2 joerg char dgmbuf[6]; 78 1.2.2.2 joerg int off, dlen; 79 1.2.2.2 joerg udphdr_t *udp; 80 1.2.2.2 joerg ip_t *ip; 81 1.2.2.2 joerg mb_t *m; 82 1.2.2.2 joerg 83 1.2.2.2 joerg aps = aps; /* LINT */ 84 1.2.2.2 joerg nat = nat; /* LINT */ 85 1.2.2.2 joerg 86 1.2.2.2 joerg m = fin->fin_m; 87 1.2.2.2 joerg dlen = fin->fin_dlen - sizeof(*udp); 88 1.2.2.2 joerg /* 89 1.2.2.2 joerg * no net bios datagram could possibly be shorter than this 90 1.2.2.2 joerg */ 91 1.2.2.2 joerg if (dlen < 11) 92 1.2.2.2 joerg return 0; 93 1.2.2.2 joerg 94 1.2.2.2 joerg ip = fin->fin_ip; 95 1.2.2.2 joerg udp = (udphdr_t *)fin->fin_dp; 96 1.2.2.2 joerg off = (char *)udp - (char *)ip + sizeof(*udp) + fin->fin_ipoff; 97 1.2.2.2 joerg 98 1.2.2.2 joerg /* 99 1.2.2.2 joerg * move past the 100 1.2.2.2 joerg * ip header; 101 1.2.2.2 joerg * udp header; 102 1.2.2.2 joerg * 4 bytes into the net bios dgm header. 103 1.2.2.2 joerg * According to rfc1002, this should be the exact location of 104 1.2.2.2 joerg * the source address/port 105 1.2.2.2 joerg */ 106 1.2.2.2 joerg off += 4; 107 1.2.2.2 joerg 108 1.2.2.2 joerg /* Copy NATed source Address/port*/ 109 1.2.2.2 joerg dgmbuf[0] = (char)((ip->ip_src.s_addr ) &0xFF); 110 1.2.2.2 joerg dgmbuf[1] = (char)((ip->ip_src.s_addr >> 8) &0xFF); 111 1.2.2.2 joerg dgmbuf[2] = (char)((ip->ip_src.s_addr >> 16)&0xFF); 112 1.2.2.2 joerg dgmbuf[3] = (char)((ip->ip_src.s_addr >> 24)&0xFF); 113 1.2.2.2 joerg 114 1.2.2.2 joerg dgmbuf[4] = (char)((udp->uh_sport )&0xFF); 115 1.2.2.2 joerg dgmbuf[5] = (char)((udp->uh_sport >> 8)&0xFF); 116 1.2.2.2 joerg 117 1.2.2.2 joerg /* replace data in packet */ 118 1.2.2.2 joerg COPYBACK(m, off, sizeof(dgmbuf), dgmbuf); 119 1.2.2.2 joerg 120 1.2.2.2 joerg return 0; 121 1.2.2.2 joerg } 122
Indexes created Tue Oct 21 16:10:11 GMT 2025