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94a3708f00
Builds using Autotools or CMake generate config.h, thus remove the '#ifdef HAVE_CONFIG_H'/'#endif'. Remove also the 'add_definitions(-DHAVE_CONFIG_H)' in CMakeLists.txt.
88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
/*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code
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* distributions retain the above copyright notice and this paragraph
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* in its entirety, and (2) distributions including binary code include
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* the above copyright notice and this paragraph in its entirety in
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* the documentation or other materials provided with the distribution.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND
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* WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
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* LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE.
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*
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* Original code by Francesco Fondelli (francesco dot fondelli, gmail dot com)
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*/
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/* \summary: Virtual eXtensible Local Area Network (VXLAN) printer */
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/* specification: RFC 7348 */
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#include <config.h>
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#include "netdissect-stdinc.h"
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#define ND_LONGJMP_FROM_TCHECK
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#include "netdissect.h"
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#include "extract.h"
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#define VXLAN_I 0x08 /* Instance Bit */
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static const struct tok vxlan_flags [] = {
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{ VXLAN_I, "I" },
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{ 0, NULL }
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};
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#define VXLAN_HDR_LEN 8
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/*
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* VXLAN header, RFC7348
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* Virtual eXtensible Local Area Network (VXLAN): A Framework
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* for Overlaying Virtualized Layer 2 Networks over Layer 3 Networks
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*
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |R|R|R|R|I|R|R|R| Reserved |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | VXLAN Network Identifier (VNI) | Reserved |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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void
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vxlan_print(netdissect_options *ndo, const u_char *bp, u_int len)
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{
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uint8_t flags;
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ndo->ndo_protocol = "vxlan";
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nd_print_protocol_caps(ndo);
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if (len < VXLAN_HDR_LEN)
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goto invalid;
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flags = GET_U_1(bp);
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bp += 1;
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ND_PRINT(", flags [%s] (0x%02x), ",
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bittok2str_nosep(vxlan_flags, "invalid", flags), flags);
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/* 1st Reserved */
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bp += 3;
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/*
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* RFC 7348 says that the I flag MUST be set.
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*/
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if (flags & VXLAN_I)
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ND_PRINT("vni %u\n", GET_BE_U_3(bp));
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else
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ND_PRINT("ERROR: I flag not set\n");
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bp += 3;
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/* 2nd Reserved */
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ND_TCHECK_1(bp);
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bp += 1;
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ether_print(ndo, bp, len - VXLAN_HDR_LEN, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL);
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return;
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invalid:
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nd_print_invalid(ndo);
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}
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