source: libpacketdump/ip_47.c @ 1de522d

4.0.1-hotfixescachetimestampsdevelopdpdk-ndagetsilivendag_formatrc-4.0.1rc-4.0.2rc-4.0.3rc-4.0.4ringdecrementfixringperformanceringtimestampfixes
Last change on this file since 1de522d was ee6e802, checked in by Shane Alcock <salcock@…>, 5 years ago

Updated copyright blurb on all source files

In some cases, this meant adding copyright blurbs to files that
had never had them before.

  • Property mode set to 100644
File size: 1.8 KB
Line 
1/*
2 *
3 * Copyright (c) 2007-2016 The University of Waikato, Hamilton, New Zealand.
4 * All rights reserved.
5 *
6 * This file is part of libtrace.
7 *
8 * This code has been developed by the University of Waikato WAND
9 * research group. For further information please see http://www.wand.net.nz/
10 *
11 * libtrace is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU Lesser General Public License as published by
13 * the Free Software Foundation; either version 3 of the License, or
14 * (at your option) any later version.
15 *
16 * libtrace is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19 * GNU Lesser General Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser General Public License
22 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
23 *
24 *
25 */
26#include <sys/types.h>
27#include <netinet/in.h>
28#include <stdio.h>
29#include "libpacketdump.h"
30
31typedef struct gre_t {
32        uint16_t flags;
33        uint16_t ethertype;
34        uint16_t checksum;
35        uint16_t reserved1;
36} gre_t;
37
38DLLEXPORT void decode(int link_type UNUSED,const char *packet,unsigned len)
39{
40        // GRE
41        if (len<2) {
42                printf(" GRE: [Truncated]\n");
43                return;
44        }
45        printf(" GRE: %s\n",
46                ntohs(((gre_t*)packet)->flags) & 0x8000 
47                        ? "Checksum present"
48                        : "Checksum absent");
49        printf(" GRE: Version: %d\n", ntohs(((gre_t*)packet)->flags) & 0x0007);
50        printf(" GRE: Protocol: %04x\n", ntohs(((gre_t*)packet)->ethertype));
51
52        if (ntohs(((gre_t*)packet)->flags) & 0x8000) {
53                decode_next(packet+4,len-4,"link",
54                                ntohs(((gre_t*)packet)->ethertype));
55        }
56        else {
57                decode_next(packet+8,len-8,"link",
58                                ntohs(((gre_t*)packet)->ethertype));
59        }
60        return;
61}
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