1 /* 2 * Redistribution and use in source and binary forms, with or without 3 * modification, are permitted provided that: (1) source code 4 * distributions retain the above copyright notice and this paragraph 5 * in its entirety, and (2) distributions including binary code include 6 * the above copyright notice and this paragraph in its entirety in 7 * the documentation or other materials provided with the distribution. 8 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND 9 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT 10 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 11 * FOR A PARTICULAR PURPOSE. 12 * 13 * Original code by Francesco Fondelli (francesco dot fondelli, gmail dot com) 14 */ 15 16 /* \summary: Overlay Transport Virtualization (OTV) printer */ 17 18 /* specification: draft-hasmit-otv-04 */ 19 20 #ifdef HAVE_CONFIG_H 21 #include "config.h" 22 #endif 23 24 #include <netdissect-stdinc.h> 25 26 #include "netdissect.h" 27 #include "extract.h" 28 29 /* 30 * OTV header, draft-hasmit-otv-04 31 * 32 * 0 1 2 3 33 * 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 34 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 35 * |R|R|R|R|I|R|R|R| Overlay ID | 36 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 37 * | Instance ID | Reserved | 38 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 39 */ 40 41 void 42 otv_print(netdissect_options *ndo, const u_char *bp, u_int len) 43 { 44 uint8_t flags; 45 46 ND_PRINT((ndo, "OTV, ")); 47 if (len < 8) 48 goto trunc; 49 50 ND_TCHECK(*bp); 51 flags = *bp; 52 ND_PRINT((ndo, "flags [%s] (0x%02x), ", flags & 0x08 ? "I" : ".", flags)); 53 bp += 1; 54 55 ND_TCHECK2(*bp, 3); 56 ND_PRINT((ndo, "overlay %u, ", EXTRACT_24BITS(bp))); 57 bp += 3; 58 59 ND_TCHECK2(*bp, 3); 60 ND_PRINT((ndo, "instance %u\n", EXTRACT_24BITS(bp))); 61 bp += 3; 62 63 /* Reserved */ 64 ND_TCHECK(*bp); 65 bp += 1; 66 67 ether_print(ndo, bp, len - 8, ndo->ndo_snapend - bp, NULL, NULL); 68 return; 69 70 trunc: 71 ND_PRINT((ndo, " [|OTV]")); 72 } 73