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1.1.6

    1: /*
    2:  *  $Id: libnet_build_isl.c,v 1.1.1.2 2013/07/22 11:54:42 misho Exp $
    3:  *
    4:  *  libnet
    5:  *  libnet_build_isl.c - cisco's inter-switch link 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_isl(uint8_t *dhost, uint8_t type, uint8_t user,
   44: uint8_t *shost, uint16_t len, const uint8_t *snap, uint16_t vid,
   45: uint16_t portindex, uint16_t reserved, const uint8_t *payload,
   46: uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
   47: {
   48:     uint32_t n;
   49:     libnet_pblock_t *p;
   50:     struct libnet_isl_hdr isl_hdr;
   51: 
   52:     if (l == NULL)
   53:     {
   54:         return (-1);
   55:     }
   56: 
   57:     n = LIBNET_ISL_H + payload_s;           /* size of memory block */
   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_ISL_H);
   64:     if (p == NULL)
   65:     {
   66:         return (-1);
   67:     }
   68: 
   69:     memset(&isl_hdr, 0, sizeof (isl_hdr));
   70:     memcpy(&isl_hdr.isl_dhost, dhost, sizeof(isl_hdr.isl_dhost));
   71:     isl_hdr.isl_type    = type;
   72:     isl_hdr.isl_user    = user;
   73:     memcpy(&isl_hdr.isl_shost, shost, sizeof(isl_hdr.isl_shost));
   74:     isl_hdr.isl_len     = htons(len);
   75:     memcpy(&isl_hdr.isl_snap, snap, sizeof(isl_hdr.isl_snap));
   76:     isl_hdr.isl_vid     = htons(vid);
   77:     isl_hdr.isl_index   = htons(portindex);
   78:     isl_hdr.isl_reserved= htons(reserved);
   79: 
   80:     n = libnet_pblock_append(l, p, (uint8_t *)&isl_hdr, LIBNET_ISL_H);
   81:     if (n == -1)
   82:     {
   83:         goto bad;
   84:     }
   85: 
   86:     /* boilerplate payload sanity check / append macro */
   87:     LIBNET_DO_PAYLOAD(l, p);
   88: 
   89:     /* we need to compute the CRC for the ethernet frame and the ISL frame */
   90:     libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM);
   91:     return (ptag ? ptag : libnet_pblock_update(l, p, LIBNET_ISL_H,
   92:             LIBNET_PBLOCK_ISL_H));
   93: bad:
   94:     libnet_pblock_delete(l, p);
   95:     return (-1);
   96: }
   97: 
   98: /* EOF */