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 #define NETDISSECT_REWORKED 17 #ifdef HAVE_CONFIG_H 18 #include "config.h" 19 #endif 20 21 #include <tcpdump-stdinc.h> 22 23 #include "interface.h" 24 #include "extract.h" 25 26 /* 27 * OTV header, draft-hasmit-otv-04 28 * 29 * 0 1 2 3 30 * 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 31 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 32 * |R|R|R|R|I|R|R|R| Overlay ID | 33 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 34 * | Instance ID | Reserved | 35 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 36 */ 37 38 void 39 otv_print(netdissect_options *ndo, const u_char *bp, u_int len) 40 { 41 uint8_t flags; 42 uint32_t overlay_id; 43 uint32_t instance_id; 44 45 if (len < 8) { 46 ND_PRINT((ndo, "[|OTV]")); 47 return; 48 } 49 50 flags = *bp; 51 bp += 1; 52 53 overlay_id = EXTRACT_24BITS(bp); 54 bp += 3; 55 56 instance_id = EXTRACT_24BITS(bp); 57 bp += 4; 58 59 ND_PRINT((ndo, "OTV, ")); 60 ND_PRINT((ndo, "flags [%s] (0x%02x), ", flags & 0x08 ? "I" : ".", flags)); 61 ND_PRINT((ndo, "overlay %u, ", overlay_id)); 62 ND_PRINT((ndo, "instance %u\n", instance_id)); 63 64 ether_print(ndo, bp, len - 8, len - 8, NULL, NULL); 65 } 66