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

1.1       misho       1: /*
1.1.1.2   misho       2:  *  $Id: libnet_build_mpls.c,v 1.10 2004/04/13 17:32:28 mike Exp $
1.1       misho       3:  *
                      4:  *  libnet
                      5:  *  libnet_build_mpls.c - MPLS 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: 
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_mpls(uint32_t label, uint8_t experimental, uint8_t bos, 
                     37: uint8_t ttl, const uint8_t *payload, uint32_t payload_s, libnet_t *l,
1.1       misho      38: libnet_ptag_t ptag)
                     39: {
1.1.1.2   misho      40:     uint32_t n, h;
1.1       misho      41:     libnet_pblock_t *p;
                     42:     struct libnet_mpls_hdr mpls_hdr;
                     43: 
                     44:     if (l == NULL)
                     45:     { 
                     46:         return (-1);
                     47:     } 
                     48: 
                     49:     n = LIBNET_MPLS_H + payload_s;
                     50:     h = 0;
                     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_MPLS_H);
                     57:     if (p == NULL)
                     58:     {
                     59:         return (-1);
                     60:     }
                     61: 
                     62:     memset(&mpls_hdr, 0, sizeof(mpls_hdr));
                     63:     mpls_hdr.mpls_les = htonl((((label & 0x000fffff) << 12) |
                     64:                               ((experimental & 0x07) <<  9) |
                     65:                               ((bos & 0x01)          <<  8) |
                     66:                               ((ttl & 0xff))));
                     67: 
1.1.1.2   misho      68:     n = libnet_pblock_append(l, p, (uint8_t *)&mpls_hdr, LIBNET_MPLS_H);
1.1       misho      69:     if (n == -1)
                     70:     {
                     71:         goto bad;
                     72:     }
                     73: 
1.1.1.2   misho      74:     /* boilerplate payload sanity check / append macro */
                     75:     LIBNET_DO_PAYLOAD(l, p);
1.1       misho      76: 
                     77:     /*
                     78:      *  The link offset is actually 4 bytes further into the header than
                     79:      *  before (the MPLS header adds this 4 bytes).  We need to update the
                     80:      *  link offset pointer. XXX - should we set this here?
                     81:      *  Probably not.  We should make pblock_coalesce check the pblock type
                     82:      *  and adjust accordingly.
                     83:      */
                     84:     l->link_offset += 4;
                     85: 
                     86:     return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_MPLS_H));
                     87: bad:
                     88:     libnet_pblock_delete(l, p);
                     89:     return (-1);
                     90: }
                     91: 
1.1.1.3 ! misho      92: /**
        !            93:  * Local Variables:
        !            94:  *  indent-tabs-mode: nil
        !            95:  *  c-file-style: "stroustrup"
        !            96:  * End:
        !            97:  */