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[] _U_ =
  18     "@(#) $Header: /tcpdump/master/tcpdump/print-bfd.c,v 1.3.2.2 2003-11-16 08:51:12 guy 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 #include "udp.h"
  35
  36 /*
  37  * Control packet, draft-katz-ward-bfd-01.txt
  38  *
  39  *     0                   1                   2                   3
  40  *     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
  41  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  42  *    |Vers |  Diag   |H|D|P|F| Rsvd  |  Detect Mult  |    Length     |
  43  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  44  *    |                       My Discriminator                        |
  45  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  46  *    |                      Your Discriminator                       |
  47  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  48  *    |                    Desired Min TX Interval                    |
  49  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  50  *    |                   Required Min RX Interval                    |
  51  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  52  *    |                 Required Min Echo RX Interval                 |
  53  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  54  */
  55
  56 struct bfd_header_t {
  57     u_int8_t version_diag;
  58     u_int8_t flags;
  59     u_int8_t detect_time_multiplier;
  60     u_int8_t length;
  61     u_int8_t my_discriminator[4];
  62     u_int8_t your_discriminator[4];
  63     u_int8_t desired_min_tx_interval[4];
  64     u_int8_t required_min_rx_interval[4];
  65     u_int8_t required_min_echo_interval[4];
  66 };
  67
  68 #define BFD_EXTRACT_VERSION(x) (((x)&0xe0)>>5)
  69 #define BFD_EXTRACT_DIAG(x)     ((x)&0x1f)
  70
  71 static const struct tok bfd_port_values[] = {
  72     { BFD_CONTROL_PORT, "Control" },
  73     { BFD_ECHO_PORT,    "Echo" },
  74     { 0, NULL }
  75 };
  76
  77
  78 static const struct tok bfd_diag_values[] = {
  79     { 0, "No Diagnostic" },
  80     { 1, "Control Detection Time Expired" },
  81     { 2, "Echo Function Failed" },
  82     { 3, "Neighbor Signaled Session Down" },
  83     { 4, "Forwarding Plane Reset" },
  84     { 5, "Path Down" },
  85     { 6, "Concatenated Path Down" },
  86     { 7, "Administratively Down" },
  87     { 0, NULL }
  88 };
  89
  90 static const struct tok bfd_flag_values[] = {
  91     { 0x80,     "I Hear You" },
  92     { 0x40,     "Demand" },
  93     { 0x20,     "Poll" },
  94     { 0x10,     "Final" },
  95     { 0x08,     "Reserved" },
  96     { 0x04,     "Reserved" },
  97     { 0x02,     "Reserved" },
  98     { 0x01,     "Reserved" },
  99     { 0, NULL }
 100 };
 101
 102 void
 103 bfd_print(register const u_char *pptr, register u_int len, register u_int port)
 104 {
 105         const struct bfd_header_t *bfd_header;
 106
 107         bfd_header = (const struct bfd_header_t *)pptr;
 108         TCHECK(*bfd_header);
 109
 110         switch (port) {
 111
 112         case BFD_CONTROL_PORT:
 113             if (vflag < 1 )
 114             {
 115                 printf("BFDv%u, %s, Flags: [%s], length: %u",
 116                        BFD_EXTRACT_VERSION(bfd_header->version_diag),
 117                        tok2str(bfd_port_values, "unknown (%u)", port),
 118                        bittok2str(bfd_flag_values, "none", bfd_header->flags),
 119                        len);
 120                 return;
 121             }
 122
 123             printf("BFDv%u, length: %u\n\t%s, Flags: [%s], Diagnostic: %s (0x%02x)",
 124                    BFD_EXTRACT_VERSION(bfd_header->version_diag),
 125                    len,
 126                    tok2str(bfd_port_values, "unknown (%u)", port),
 127                    bittok2str(bfd_flag_values, "none", bfd_header->flags),
 128                    tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(bfd_header->version_diag)),
 129                BFD_EXTRACT_DIAG(bfd_header->version_diag));
 130
 131             printf("\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u",
 132                    bfd_header->detect_time_multiplier,
 133                    bfd_header->detect_time_multiplier * EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000,
 134                    bfd_header->length);
 135
 136
 137             printf("\n\tMy Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->my_discriminator));
 138             printf(", Your Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->your_discriminator));
 139             printf("\n\t  Desired min Tx Interval:    %4u ms", EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000);
 140             printf("\n\t  Required min Rx Interval:   %4u ms", EXTRACT_32BITS(bfd_header->required_min_rx_interval)/1000);
 141             printf("\n\t  Required min Echo Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_echo_interval)/1000);
 142             break;
 143
 144         case BFD_ECHO_PORT: /* not yet supported - fall through */
 145
 146         default:
 147             printf("BFD, %s, length: %u",
 148                    tok2str(bfd_port_values, "unknown (%u)", port),
 149                    len);
 150             if (vflag >= 1) {
 151                 if(!print_unknown_data(pptr,"\n\t",len))
 152                     return;
 153             }
 154             break;
 155         }
 156         return;
 157
 158 trunc:
 159         printf("[|BFD]");
 160 }