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72 lines
2.1 KiB
72 lines
2.1 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: Overlay Transport Virtualization (OTV) printer */ |
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/* specification: draft-hasmit-otv-04 */ |
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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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/* |
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* OTV header, draft-hasmit-otv-04 |
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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| Overlay ID | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* | Instance ID | Reserved | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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*/ |
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void |
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otv_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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ND_PRINT((ndo, "OTV, ")); |
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if (len < 8) |
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goto trunc; |
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ND_TCHECK(*bp); |
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flags = *bp; |
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ND_PRINT((ndo, "flags [%s] (0x%02x), ", flags & 0x08 ? "I" : ".", flags)); |
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bp += 1; |
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ND_TCHECK2(*bp, 3); |
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ND_PRINT((ndo, "overlay %u, ", EXTRACT_24BITS(bp))); |
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bp += 3; |
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ND_TCHECK2(*bp, 3); |
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ND_PRINT((ndo, "instance %u\n", EXTRACT_24BITS(bp))); |
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bp += 3; |
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/* Reserved */ |
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ND_TCHECK(*bp); |
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bp += 1; |
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ether_print(ndo, bp, len - 8, ndo->ndo_snapend - bp, NULL, NULL); |
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return; |
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trunc: |
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ND_PRINT((ndo, " [|OTV]")); |
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}
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