mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-11-27 20:14:12 +08:00
115 lines
3.6 KiB
C
115 lines
3.6 KiB
C
/* Copyright (c) 2015, bugyo
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
* 1. Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
|
|
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
|
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/* \summary: Generic Protocol Extension for VXLAN (VXLAN GPE) printer */
|
|
|
|
/* specification: draft-ietf-nvo3-vxlan-gpe-01 */
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <config.h>
|
|
#endif
|
|
|
|
#include "netdissect-stdinc.h"
|
|
|
|
#include "netdissect.h"
|
|
#include "extract.h"
|
|
|
|
static const char tstr[] = " [|VXLAN-GPE]";
|
|
static const struct tok vxlan_gpe_flags [] = {
|
|
{ 0x08, "I" },
|
|
{ 0x04, "P" },
|
|
{ 0x01, "O" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
#define VXLAN_GPE_HDR_LEN 8
|
|
|
|
/*
|
|
* VXLAN GPE header, draft-ietf-nvo3-vxlan-gpe-01
|
|
* Generic Protocol Extension for VXLAN
|
|
*
|
|
* 0 1 2 3
|
|
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* |R|R|Ver|I|P|R|O| Reserved |Next Protocol |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | VXLAN Network Identifier (VNI) | Reserved |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
*/
|
|
|
|
void
|
|
vxlan_gpe_print(netdissect_options *ndo, const u_char *bp, u_int len)
|
|
{
|
|
uint8_t flags;
|
|
uint8_t next_protocol;
|
|
uint32_t vni;
|
|
|
|
ndo->ndo_protocol = "vxlan_gpe";
|
|
if (len < VXLAN_GPE_HDR_LEN)
|
|
goto trunc;
|
|
|
|
ND_TCHECK_LEN(bp, VXLAN_GPE_HDR_LEN);
|
|
|
|
flags = EXTRACT_U_1(bp);
|
|
bp += 3;
|
|
|
|
next_protocol = EXTRACT_U_1(bp);
|
|
bp += 1;
|
|
|
|
vni = EXTRACT_BE_U_3(bp);
|
|
bp += 4;
|
|
|
|
ND_PRINT("VXLAN-GPE, ");
|
|
ND_PRINT("flags [%s], ",
|
|
bittok2str_nosep(vxlan_gpe_flags, "none", flags));
|
|
ND_PRINT("vni %u", vni);
|
|
ND_PRINT(ndo->ndo_vflag ? "\n " : ": ");
|
|
|
|
switch (next_protocol) {
|
|
case 0x1:
|
|
ip_print(ndo, bp, len - VXLAN_GPE_HDR_LEN);
|
|
break;
|
|
case 0x2:
|
|
ip6_print(ndo, bp, len - VXLAN_GPE_HDR_LEN);
|
|
break;
|
|
case 0x3:
|
|
ether_print(ndo, bp, len - VXLAN_GPE_HDR_LEN, ndo->ndo_snapend - bp, NULL, NULL);
|
|
break;
|
|
case 0x4:
|
|
nsh_print(ndo, bp, len - VXLAN_GPE_HDR_LEN);
|
|
break;
|
|
case 0x5:
|
|
mpls_print(ndo, bp, len - VXLAN_GPE_HDR_LEN);
|
|
break;
|
|
default:
|
|
ND_PRINT("ERROR: unknown-next-protocol");
|
|
return;
|
|
}
|
|
|
|
return;
|
|
|
|
trunc:
|
|
ND_PRINT("%s", tstr);
|
|
}
|
|
|