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 #ifdef HAVE_CONFIG_H 17 #include "config.h" 18 #endif 19 20 #include <tcpdump-stdinc.h> 21 22 #include <stdio.h> 23 #include <stdlib.h> 24 25 #include "interface.h" 26 #include "extract.h" 27 #include "addrtoname.h" 28 29 #include "udp.h" 30 31 /* 32 * OTV header, draft-hasmit-otv-04 33 * 34 * 0 1 2 3 35 * 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 36 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 37 * |R|R|R|R|I|R|R|R| Overlay ID | 38 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 39 * | Instance ID | Reserved | 40 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 41 */ 42 43 void 44 otv_print(const u_char *bp, u_int len) 45 { 46 u_int8_t flags; 47 u_int32_t overlay_id; 48 u_int32_t instance_id; 49 50 if (len < 8) { 51 printf("[|OTV]"); 52 return; 53 } 54 55 flags = *bp; 56 bp += 1; 57 58 overlay_id = EXTRACT_24BITS(bp); 59 bp += 3; 60 61 instance_id = EXTRACT_24BITS(bp); 62 bp += 4; 63 64 printf("OTV, "); 65 66 fputs("flags [", stdout); 67 if (flags & 0x08) 68 fputs("I", stdout); 69 else 70 fputs(".", stdout); 71 fputs("] ", stdout); 72 73 printf("(0x%02x), ", flags); 74 printf("overlay %u, ", overlay_id); 75 printf("instance %u\n", instance_id); 76 77 ether_print(gndo, bp, len - 8, len - 8, NULL, NULL); 78 return; 79 } 80