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Annotation of embedaddon/libnet/src/libnet_build_isl.c, revision 1.1.1.3

1.1       misho       1: /*
1.1.1.2   misho       2:  *  $Id: libnet_build_isl.c,v 1.10 2004/04/13 17:32:28 mike Exp $
1.1       misho       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: 
1.1.1.3 ! misho      33: #include "common.h"
1.1       misho      34: 
                     35: libnet_ptag_t
1.1.1.2   misho      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)
1.1       misho      40: {
1.1.1.2   misho      41:     uint32_t n;
1.1       misho      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: 
1.1.1.2   misho      62:     memset(&isl_hdr, 0, sizeof (isl_hdr));
                     63:     memcpy(&isl_hdr.isl_dhost, dhost, sizeof(isl_hdr.isl_dhost));
1.1       misho      64:     isl_hdr.isl_type    = type;
                     65:     isl_hdr.isl_user    = user;
1.1.1.2   misho      66:     memcpy(&isl_hdr.isl_shost, shost, sizeof(isl_hdr.isl_shost));
1.1       misho      67:     isl_hdr.isl_len     = htons(len);
1.1.1.2   misho      68:     memcpy(&isl_hdr.isl_snap, snap, sizeof(isl_hdr.isl_snap));
1.1       misho      69:     isl_hdr.isl_vid     = htons(vid);
1.1.1.2   misho      70:     isl_hdr.isl_index   = htons(portindex);
1.1       misho      71:     isl_hdr.isl_reserved= htons(reserved);
                     72: 
1.1.1.2   misho      73:     n = libnet_pblock_append(l, p, (uint8_t *)&isl_hdr, LIBNET_ISL_H);
1.1       misho      74:     if (n == -1)
                     75:     {
                     76:         goto bad;
                     77:     }
                     78: 
1.1.1.2   misho      79:     /* boilerplate payload sanity check / append macro */
                     80:     LIBNET_DO_PAYLOAD(l, p);
1.1       misho      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: 
1.1.1.3 ! misho      91: /**
        !            92:  * Local Variables:
        !            93:  *  indent-tabs-mode: nil
        !            94:  *  c-file-style: "stroustrup"
        !            95:  * End:
        !            96:  */