The Tcpdump Group git mirrors - tcpdump/blob - print-bfd.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 Hannes Gredler (hannes@juniper.net)
  14  */
  15
  16 #ifndef lint
  17 static const char rcsid[] =
  18     "@(#) $Header: /tcpdump/master/tcpdump/print-bfd.c,v 1.2 2003-10-27 17:21:32 hannes Exp $";
  19 #endif
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include "config.h"
  23 #endif
  24
  25 #include <tcpdump-stdinc.h>
  26
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29
  30 #include "interface.h"
  31 #include "extract.h"
  32 #include "addrtoname.h"
  33
  34 /*
  35  * Control packet, draft-katz-ward-bfd-01.txt
  36  *
  37  *     0                   1                   2                   3
  38  *     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
  39  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  40  *    |Vers |  Diag   |H|D|P|F| Rsvd  |  Detect Mult  |    Length     |
  41  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  42  *    |                       My Discriminator                        |
  43  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  44  *    |                      Your Discriminator                       |
  45  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  46  *    |                    Desired Min TX Interval                    |
  47  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  48  *    |                   Required Min RX Interval                    |
  49  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  50  *    |                 Required Min Echo RX Interval                 |
  51  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  52  */
  53
  54 struct bfd_header_t {
  55     u_int8_t version_diag;
  56     u_int8_t flags;
  57     u_int8_t detect_time_multiplier;
  58     u_int8_t length;
  59     u_int8_t my_discriminator[4];
  60     u_int8_t your_discriminator[4];
  61     u_int8_t desired_min_tx_interval[4];
  62     u_int8_t required_min_rx_interval[4];
  63     u_int8_t required_min_echo_interval[4];
  64 };
  65
  66 #define BFD_EXTRACT_VERSION(x) (((x)&0xe0)>>5)
  67 #define BFD_EXTRACT_DIAG(x)     ((x)&0x1f)
  68
  69 static const struct tok bfd_port_values[] = {
  70     { 3784, "Control" },
  71     { 3785, "Echo" },
  72     { 0, NULL }
  73 };
  74
  75
  76 static const struct tok bfd_diag_values[] = {
  77     { 0, "No Diagnostic" },
  78     { 1, "Control Detection Time Expired" },
  79     { 2, "Echo Function Failed" },
  80     { 3, "Neighbor Signaled Session Down" },
  81     { 4, "Forwarding Plane Reset" },
  82     { 5, "Path Down" },
  83     { 6, "Concatenated Path Down" },
  84     { 7, "Administratively Down" },
  85     { 0, NULL }
  86 };
  87
  88 static const struct tok bfd_flag_values[] = {
  89     { 0x80,     "I Hear You" },
  90     { 0x40,     "Demand" },
  91     { 0x20,     "Poll" },
  92     { 0x10,     "Final" },
  93     { 0x08,     "Reserved" },
  94     { 0x04,     "Reserved" },
  95     { 0x02,     "Reserved" },
  96     { 0x01,     "Reserved" },
  97     { 0, NULL }
  98 };
  99
 100 void
 101 bfd_print(register const u_char *pptr, register u_int len, register u_int port)
 102 {
 103         const struct bfd_header_t *bfd_header;
 104
 105         bfd_header = (const struct bfd_header_t *)pptr;
 106         TCHECK(*bfd_header);
 107
 108         if (vflag < 1 )
 109         {
 110             printf("BFDv%u, %s, Flags: [%s], length: %u",
 111                    BFD_EXTRACT_VERSION(bfd_header->version_diag),
 112                    tok2str(bfd_port_values, "unknown (%u)", port),
 113                    bittok2str(bfd_flag_values, "none", bfd_header->flags),
 114                    len);
 115             return;
 116         }
 117
 118         printf("BFDv%u, length: %u\n\t%s, Flags: [%s], Diagnostic: %s (0x%02x)",
 119                BFD_EXTRACT_VERSION(bfd_header->version_diag),
 120                len,
 121                tok2str(bfd_port_values, "unknown (%u)", port),
 122                bittok2str(bfd_flag_values, "none", bfd_header->flags),
 123                tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(bfd_header->version_diag)),
 124                BFD_EXTRACT_DIAG(bfd_header->version_diag));
 125
 126         printf("\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u",
 127                bfd_header->detect_time_multiplier,
 128                bfd_header->detect_time_multiplier * EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000,
 129                bfd_header->length);
 130
 131
 132         printf("\n\tMy Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->my_discriminator));
 133         printf(", Your Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->your_discriminator));
 134         printf("\n\t  Desired min Tx Interval:    %4u ms", EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000);
 135         printf("\n\t  Required min Rx Interval:   %4u ms", EXTRACT_32BITS(bfd_header->required_min_rx_interval)/1000);
 136         printf("\n\t  Required min Echo Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_echo_interval)/1000);
 137
 138         return;
 139
 140 trunc:
 141         printf("[|BFD]");
 142 }