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74 lines
2.2 KiB
74 lines
2.2 KiB
/* |
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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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#ifdef HAVE_CONFIG_H |
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#include "config.h" |
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#endif |
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#include <netdissect-stdinc.h> |
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#include "netdissect.h" |
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#include "extract.h" |
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static const char tstr[] = " [|VXLAN]"; |
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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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uint32_t vni; |
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if (len < VXLAN_HDR_LEN) |
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goto trunc; |
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ND_TCHECK2(*bp, VXLAN_HDR_LEN); |
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flags = *bp; |
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bp += 4; |
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vni = EXTRACT_24BITS(bp); |
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bp += 4; |
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ND_PRINT((ndo, "VXLAN, ")); |
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ND_PRINT((ndo, "flags [%s] (0x%02x), ", flags & 0x08 ? "I" : ".", flags)); |
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ND_PRINT((ndo, "vni %u\n", vni)); |
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ether_print(ndo, bp, len - VXLAN_HDR_LEN, ndo->ndo_snapend - bp, NULL, NULL); |
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return; |
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trunc: |
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ND_PRINT((ndo, "%s", tstr)); |
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}
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