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Annotation of embedaddon/libnet/src/libnet_build_mpls.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  *  $Id: libnet_build_mpls.c,v 1.9 2004/03/01 20:26:12 mike Exp $
        !             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: 
        !            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_mpls(u_int32_t label, u_int8_t experimental, u_int8_t bos, 
        !            44: u_int8_t ttl, u_int8_t *payload, u_int32_t payload_s, libnet_t *l,
        !            45: libnet_ptag_t ptag)
        !            46: {
        !            47:     u_int32_t n, h;
        !            48:     libnet_pblock_t *p;
        !            49:     struct libnet_mpls_hdr mpls_hdr;
        !            50: 
        !            51:     if (l == NULL)
        !            52:     { 
        !            53:         return (-1);
        !            54:     } 
        !            55: 
        !            56:     n = LIBNET_MPLS_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_MPLS_H);
        !            64:     if (p == NULL)
        !            65:     {
        !            66:         return (-1);
        !            67:     }
        !            68: 
        !            69:     memset(&mpls_hdr, 0, sizeof(mpls_hdr));
        !            70:     mpls_hdr.mpls_les = htonl((((label & 0x000fffff) << 12) |
        !            71:                               ((experimental & 0x07) <<  9) |
        !            72:                               ((bos & 0x01)          <<  8) |
        !            73:                               ((ttl & 0xff))));
        !            74: 
        !            75:     n = libnet_pblock_append(l, p, (u_int8_t *)&mpls_hdr, LIBNET_MPLS_H);
        !            76:     if (n == -1)
        !            77:     {
        !            78:         goto bad;
        !            79:     }
        !            80: 
        !            81:     if ((payload && !payload_s) || (!payload && payload_s))
        !            82:     {
        !            83:          snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
        !            84:                             "%s(): payload inconsistency\n", __func__);
        !            85:         goto bad;
        !            86:     }
        !            87: 
        !            88:     if (payload && payload_s)
        !            89:     {
        !            90:         n = libnet_pblock_append(l, p, payload, payload_s);
        !            91:         if (n == -1)
        !            92:         {
        !            93:             goto bad;
        !            94:         }
        !            95:     }
        !            96: 
        !            97:     /*
        !            98:      *  The link offset is actually 4 bytes further into the header than
        !            99:      *  before (the MPLS header adds this 4 bytes).  We need to update the
        !           100:      *  link offset pointer. XXX - should we set this here?
        !           101:      *  Probably not.  We should make pblock_coalesce check the pblock type
        !           102:      *  and adjust accordingly.
        !           103:      */
        !           104:     l->link_offset += 4;
        !           105: 
        !           106:     return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_MPLS_H));
        !           107: bad:
        !           108:     libnet_pblock_delete(l, p);
        !           109:     return (-1);
        !           110: }
        !           111: 
        !           112: /* EOF */