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libnet

    1: /*
    2:  *  $Id: libnet_build_802.1q.c,v 1.1.1.1 2012/02/21 22:14:23 misho Exp $
    3:  *
    4:  *  libnet
    5:  *  libnet_build_802.1q.c - 802.1q packet assembler
    6:  *
    7:  *  Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
    8:  *  All rights reserved.
    9:  *
   10:  * Redistribution and use in source and binary forms, with or without
   11:  * modification, are permitted provided that the following conditions
   12:  * are met:
   13:  * 1. Redistributions of source code must retain the above copyright
   14:  *    notice, this list of conditions and the following disclaimer.
   15:  * 2. Redistributions in binary form must reproduce the above copyright
   16:  *    notice, this list of conditions and the following disclaimer in the
   17:  *    documentation and/or other materials provided with the distribution.
   18:  *
   19:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29:  * SUCH DAMAGE.
   30:  *
   31:  */
   32: 
   33: #if (HAVE_CONFIG_H)
   34: #include "../include/config.h"
   35: #endif
   36: #if (!(_WIN32) || (__CYGWIN__)) 
   37: #include "../include/libnet.h"
   38: #else
   39: #include "../include/win32/libnet.h"
   40: #endif
   41: 
   42: libnet_ptag_t
   43: libnet_build_802_1q(u_int8_t *dst, u_int8_t *src, u_int16_t tpi, 
   44: u_int8_t priority, u_int8_t cfi, u_int16_t vlan_id, u_int16_t len_proto,
   45: u_int8_t *payload, u_int32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
   46: {
   47:     u_int32_t n, h;
   48:     libnet_pblock_t *p;
   49:     struct libnet_802_1q_hdr _802_1q_hdr;
   50: 
   51:     if (l == NULL)
   52:     { 
   53:         return (-1);
   54:     } 
   55: 
   56:     n = LIBNET_802_1Q_H + payload_s;
   57:     h = 0;
   58:  
   59:     /*
   60:      *  Find the existing protocol block if a ptag is specified, or create
   61:      *  a new one.
   62:      */
   63:     p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_802_1Q_H);
   64:     if (p == NULL)
   65:     {
   66:         return (-1);
   67:     }
   68: 	
   69: 	memset(&_802_1q_hdr, 0, sizeof(_802_1q_hdr));
   70: 	memcpy(_802_1q_hdr.vlan_dhost, dst, ETHER_ADDR_LEN);
   71:     memcpy(_802_1q_hdr.vlan_shost, src, ETHER_ADDR_LEN);
   72:     _802_1q_hdr.vlan_tpi = htons(tpi);
   73:     _802_1q_hdr.vlan_priority_c_vid = htons((priority << 13) | (cfi << 12)
   74:             | (vlan_id & LIBNET_802_1Q_VIDMASK));
   75:     _802_1q_hdr.vlan_len = htons(len_proto);
   76: 
   77:     n = libnet_pblock_append(l, p, (u_int8_t *)&_802_1q_hdr, LIBNET_802_1Q_H);
   78:     if (n == -1)
   79:     {
   80:         goto bad;
   81:     }
   82: 
   83:     if ((payload && !payload_s) || (!payload && payload_s))
   84:     {
   85:         snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
   86:                  "%s(): payload inconsistency\n", __func__);
   87:         goto bad;
   88:     }
   89:  
   90:     if (payload && payload_s)
   91:     {
   92:         n = libnet_pblock_append(l, p, payload, payload_s);
   93:         if (n == -1)
   94:         {
   95:             goto bad;
   96:         }
   97:     }
   98:  
   99:     /*
  100:      *  The link offset is actually 4 bytes further into the header than
  101:      *  before (the VLAN header adds this 4 bytes).  We need to update the
  102:      *  link offset pointer. XXX - should we set this here?
  103:      *  Probably not.  We should make pblock_coalesce check the pblock type
  104:      *  and adjust accordingly.
  105:      */
  106:     l->link_offset += 4;
  107:     return (ptag ? ptag : libnet_pblock_update(l, p, h,
  108:             LIBNET_PBLOCK_802_1Q_H));
  109: bad:
  110:     libnet_pblock_delete(l, p);
  111:     return (-1);
  112: }
  113: 
  114: 
  115: /* EOF */