ip_netbios_pxy.c

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    1 /*
    2  * Simple netbios-dgm transparent proxy for in-kernel use.
    3  * For use with the NAT code.
    4  * $Id$
    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  * $Id$
   33  */
   34 
   35 #define IPF_NETBIOS_PROXY
   36 
   37 void ipf_p_netbios_main_load(void);
   38 void ipf_p_netbios_main_unload(void);
   39 int ipf_p_netbios_out(void *, fr_info_t *, ap_session_t *, nat_t *);
   40 
   41 static  frentry_t       netbiosfr;
   42 
   43 int     netbios_proxy_init = 0;
   44 
   45 /*
   46  * Initialize local structures.
   47  */
   48 void
   49 ipf_p_netbios_main_load(void)
   50 {
   51         bzero((char *)&netbiosfr, sizeof(netbiosfr));
   52         netbiosfr.fr_ref = 1;
   53         netbiosfr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE;
   54         MUTEX_INIT(&netbiosfr.fr_lock, "NETBIOS proxy rule lock");
   55         netbios_proxy_init = 1;
   56 }
   57 
   58 
   59 void
   60 ipf_p_netbios_main_unload(void)
   61 {
   62         if (netbios_proxy_init == 1) {
   63                 MUTEX_DESTROY(&netbiosfr.fr_lock);
   64                 netbios_proxy_init = 0;
   65         }
   66 }
   67 
   68 
   69 int
   70 ipf_p_netbios_out(void *arg, fr_info_t *fin, ap_session_t *aps, nat_t *nat)
   71 {
   72         char dgmbuf[6];
   73         int off, dlen;
   74         udphdr_t *udp;
   75         ip_t *ip;
   76         mb_t *m;
   77 
   78         aps = aps;      /* LINT */
   79         nat = nat;      /* LINT */
   80 
   81         m = fin->fin_m;
   82         dlen = fin->fin_dlen - sizeof(*udp);
   83         /*
   84          * no net bios datagram could possibly be shorter than this
   85          */
   86         if (dlen < 11)
   87                 return (0);
   88 
   89         ip = fin->fin_ip;
   90         udp = (udphdr_t *)fin->fin_dp;
   91         off = (char *)udp - (char *)ip + sizeof(*udp) + fin->fin_ipoff;
   92 
   93         /*
   94          * move past the
   95          *      ip header;
   96          *      udp header;
   97          *      4 bytes into the net bios dgm header.
   98          *  According to rfc1002, this should be the exact location of
   99          *  the source address/port
  100          */
  101         off += 4;
  102 
  103         /* Copy NATed source Address/port*/
  104         dgmbuf[0] = (char)((ip->ip_src.s_addr     ) &0xFF);
  105         dgmbuf[1] = (char)((ip->ip_src.s_addr >> 8) &0xFF);
  106         dgmbuf[2] = (char)((ip->ip_src.s_addr >> 16)&0xFF);
  107         dgmbuf[3] = (char)((ip->ip_src.s_addr >> 24)&0xFF);
  108 
  109         dgmbuf[4] = (char)((udp->uh_sport     )&0xFF);
  110         dgmbuf[5] = (char)((udp->uh_sport >> 8)&0xFF);
  111 
  112         /* replace data in packet */
  113         COPYBACK(m, off, sizeof(dgmbuf), dgmbuf);
  114 
  115         return (0);
  116 }

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FreeBSD/Linux Kernel Cross Reference sys/netpfil/ipfilter/netinet/ip_netbios_pxy.c

FreeBSD/Linux Kernel Cross Reference
sys/netpfil/ipfilter/netinet/ip_netbios_pxy.c