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/*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code
* distributions retain the above copyright notice and this paragraph
* in its entirety, and (2) distributions including binary code include
* the above copyright notice and this paragraph in its entirety in
* the documentation or other materials provided with the distribution.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND
* WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
* LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE.
*
* Original code by Francesco Fondelli (francesco dot fondelli, gmail dot com)
*/
/* \summary: Overlay Transport Virtualization (OTV) printer */
/* specification: draft-hasmit-otv-04 */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <netdissect-stdinc.h>
#include "netdissect.h"
#include "extract.h"
/*
* OTV header, draft-hasmit-otv-04
*
* 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|R|R|I|R|R|R| Overlay ID |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Instance ID | Reserved |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
void
otv_print(netdissect_options *ndo, const u_char *bp, u_int len)
{
uint8_t flags;
ND_PRINT((ndo, "OTV, "));
if (len < 8)
goto trunc;
ND_TCHECK(*bp);
flags = *bp;
ND_PRINT((ndo, "flags [%s] (0x%02x), ", flags & 0x08 ? "I" : ".", flags));
bp += 1;
ND_TCHECK2(*bp, 3);
ND_PRINT((ndo, "overlay %u, ", EXTRACT_24BITS(bp)));
bp += 3;
ND_TCHECK2(*bp, 3);
ND_PRINT((ndo, "instance %u\n", EXTRACT_24BITS(bp)));
bp += 3;
/* Reserved */
ND_TCHECK(*bp);
bp += 1;
ether_print(ndo, bp, len - 8, ndo->ndo_snapend - bp, NULL, NULL);
return;
trunc:
ND_PRINT((ndo, " [|OTV]"));
}
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