Return to libnet_build_isl.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / libnet / src

Version 1.2p1

    1: /*
    2:  *  $Id: libnet_build_isl.c,v 1.1.1.3 2023/09/27 11:11:38 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: #include "common.h"
   34: 
   35: libnet_ptag_t
   36: libnet_build_isl(uint8_t *dhost, uint8_t type, uint8_t user,
   37: uint8_t *shost, uint16_t len, const uint8_t *snap, uint16_t vid,
   38: uint16_t portindex, uint16_t reserved, const uint8_t *payload,
   39: uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
   40: {
   41:     uint32_t n;
   42:     libnet_pblock_t *p;
   43:     struct libnet_isl_hdr isl_hdr;
   44: 
   45:     if (l == NULL)
   46:     {
   47:         return (-1);
   48:     }
   49: 
   50:     n = LIBNET_ISL_H + payload_s;           /* size of memory block */
   51: 
   52:     /*
   53:      *  Find the existing protocol block if a ptag is specified, or create
   54:      *  a new one.
   55:      */
   56:     p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ISL_H);
   57:     if (p == NULL)
   58:     {
   59:         return (-1);
   60:     }
   61: 
   62:     memset(&isl_hdr, 0, sizeof (isl_hdr));
   63:     memcpy(&isl_hdr.isl_dhost, dhost, sizeof(isl_hdr.isl_dhost));
   64:     isl_hdr.isl_type    = type;
   65:     isl_hdr.isl_user    = user;
   66:     memcpy(&isl_hdr.isl_shost, shost, sizeof(isl_hdr.isl_shost));
   67:     isl_hdr.isl_len     = htons(len);
   68:     memcpy(&isl_hdr.isl_snap, snap, sizeof(isl_hdr.isl_snap));
   69:     isl_hdr.isl_vid     = htons(vid);
   70:     isl_hdr.isl_index   = htons(portindex);
   71:     isl_hdr.isl_reserved= htons(reserved);
   72: 
   73:     n = libnet_pblock_append(l, p, (uint8_t *)&isl_hdr, LIBNET_ISL_H);
   74:     if (n == -1)
   75:     {
   76:         goto bad;
   77:     }
   78: 
   79:     /* boilerplate payload sanity check / append macro */
   80:     LIBNET_DO_PAYLOAD(l, p);
   81: 
   82:     /* we need to compute the CRC for the ethernet frame and the ISL frame */
   83:     libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM);
   84:     return (ptag ? ptag : libnet_pblock_update(l, p, LIBNET_ISL_H,
   85:             LIBNET_PBLOCK_ISL_H));
   86: bad:
   87:     libnet_pblock_delete(l, p);
   88:     return (-1);
   89: }
   90: 
   91: /**
   92:  * Local Variables:
   93:  *  indent-tabs-mode: nil
   94:  *  c-file-style: "stroustrup"
   95:  * End:
   96:  */