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      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