The Tcpdump Group git mirrors - tcpdump/blob - print-otv.c

   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
  28 /*
  29  * OTV header, draft-hasmit-otv-04
  30  *
  31  *     0                   1                   2                   3
  32  *     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
  33  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  34  *     |R|R|R|R|I|R|R|R|           Overlay ID                          |
  35  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  36  *     |          Instance ID                          | Reserved      |
  37  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  38  */
  39
  40 void
  41 otv_print(const u_char *bp, u_int len)
  42 {
  43     u_int8_t flags;
  44     u_int32_t overlay_id;
  45     u_int32_t instance_id;
  46
  47     if (len < 8) {
  48         printf("[|OTV]");
  49         return;
  50     }
  51
  52     flags = *bp;
  53     bp += 1;
  54
  55     overlay_id = EXTRACT_24BITS(bp);
  56     bp += 3;
  57
  58     instance_id = EXTRACT_24BITS(bp);
  59     bp += 4;
  60
  61     printf("OTV, ");
  62
  63     fputs("flags [", stdout);
  64     if (flags & 0x08)
  65         fputs("I", stdout);
  66     else
  67         fputs(".", stdout);
  68     fputs("] ", stdout);
  69
  70     printf("(0x%02x), ", flags);
  71     printf("overlay %u, ", overlay_id);
  72     printf("instance %u\n", instance_id);
  73
  74     ether_print(gndo, bp, len - 8, len - 8, NULL, NULL);
  75     return;
  76 }