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 #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 }