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 #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  * Control packet, BFDv0, draft-katz-ward-bfd-01.txt
  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  *    |Vers |  Diag   |H|D|P|F| Rsvd  |  Detect Mult  |    Length     |
  38  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  39  *    |                       My Discriminator                        |
  40  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  41  *    |                      Your Discriminator                       |
  42  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  43  *    |                    Desired Min TX Interval                    |
  44  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  45  *    |                   Required Min RX Interval                    |
  46  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  47  *    |                 Required Min Echo RX Interval                 |
  48  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  49  */
  50
  51 /*
  52  *  Control packet, BFDv1, draft-ietf-bfd-base-02.txt
  53  *
  54  *     0                   1                   2                   3
  55  *     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
  56  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  57  *    |Vers |  Diag   |Sta|P|F|C|A|D|R|  Detect Mult  |    Length     |
  58  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  59  *    |                       My Discriminator                        |
  60  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  61  *    |                      Your Discriminator                       |
  62  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  63  *    |                    Desired Min TX Interval                    |
  64  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  65  *    |                   Required Min RX Interval                    |
  66  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  67  *    |                 Required Min Echo RX Interval                 |
  68  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  69  */
  70
  71 struct bfd_header_t {
  72     u_int8_t version_diag;
  73     u_int8_t flags;
  74     u_int8_t detect_time_multiplier;
  75     u_int8_t length;
  76     u_int8_t my_discriminator[4];
  77     u_int8_t your_discriminator[4];
  78     u_int8_t desired_min_tx_interval[4];
  79     u_int8_t required_min_rx_interval[4];
  80     u_int8_t required_min_echo_interval[4];
  81 };
  82
  83 /*
  84  *    An optional Authentication Header may be present
  85  *
  86  *     0                   1                   2                   3
  87  *     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
  88  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  89  *    |   Auth Type   |   Auth Len    |    Authentication Data...     |
  90  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  91  */
  92
  93 struct bfd_auth_header_t {
  94     u_int8_t auth_type;
  95     u_int8_t auth_len;
  96     u_int8_t auth_data;
  97 };
  98
  99 static const struct tok bfd_v1_authentication_values[] = {
 100     { 0,        "Reserved" },
 101     { 1,        "Simple Password" },
 102     { 2,        "Keyed MD5" },
 103     { 3,        "Meticulous Keyed MD5" },
 104     { 4,        "Keyed SHA1" },
 105     { 5,        "Meticulous Keyed SHA1" },
 106     { 0, NULL }
 107 };
 108
 109 #define BFD_EXTRACT_VERSION(x) (((x)&0xe0)>>5)
 110 #define BFD_EXTRACT_DIAG(x)     ((x)&0x1f)
 111
 112 static const struct tok bfd_port_values[] = {
 113     { BFD_CONTROL_PORT, "Control" },
 114     { BFD_ECHO_PORT,    "Echo" },
 115     { 0, NULL }
 116 };
 117
 118
 119 static const struct tok bfd_diag_values[] = {
 120     { 0, "No Diagnostic" },
 121     { 1, "Control Detection Time Expired" },
 122     { 2, "Echo Function Failed" },
 123     { 3, "Neighbor Signaled Session Down" },
 124     { 4, "Forwarding Plane Reset" },
 125     { 5, "Path Down" },
 126     { 6, "Concatenated Path Down" },
 127     { 7, "Administratively Down" },
 128     { 8, "Reverse Concatenated Path Down" },
 129     { 0, NULL }
 130 };
 131
 132 static const struct tok bfd_v0_flag_values[] = {
 133     { 0x80,     "I Hear You" },
 134     { 0x40,     "Demand" },
 135     { 0x20,     "Poll" },
 136     { 0x10,     "Final" },
 137     { 0x08,     "Reserved" },
 138     { 0x04,     "Reserved" },
 139     { 0x02,     "Reserved" },
 140     { 0x01,     "Reserved" },
 141     { 0, NULL }
 142 };
 143
 144 #define BFD_FLAG_AUTH 0x04
 145
 146 static const struct tok bfd_v1_flag_values[] = {
 147     { 0x20, "Poll" },
 148     { 0x10, "Final" },
 149     { 0x08, "Control Plane Independent" },
 150     { BFD_FLAG_AUTH, "Authentication Present" },
 151     { 0x02, "Demand" },
 152     { 0x01, "Reserved" },
 153     { 0, NULL }
 154 };
 155
 156 static const struct tok bfd_v1_state_values[] = {
 157     { 0, "AdminDown" },
 158     { 1, "Down" },
 159     { 2, "Init" },
 160     { 3, "Up" },
 161     { 0, NULL }
 162 };
 163
 164 void
 165 bfd_print(register const u_char *pptr, register u_int len, register u_int port)
 166 {
 167         const struct bfd_header_t *bfd_header;
 168         const struct bfd_auth_header_t *bfd_auth_header;
 169         u_int8_t version = 0;
 170
 171         bfd_header = (const struct bfd_header_t *)pptr;
 172         if (port == BFD_CONTROL_PORT) {
 173             TCHECK(*bfd_header);
 174             version = BFD_EXTRACT_VERSION(bfd_header->version_diag);
 175         } else if (port == BFD_ECHO_PORT) {
 176             /* Echo is BFD v1 only */
 177             version = 1;
 178         }
 179         switch ((port << 8) | version) {
 180
 181             /* BFDv0 */
 182         case (BFD_CONTROL_PORT << 8):
 183             if (vflag < 1 )
 184             {
 185                 printf("BFDv%u, %s, Flags: [%s], length: %u",
 186                        version,
 187                        tok2str(bfd_port_values, "unknown (%u)", port),
 188                        bittok2str(bfd_v0_flag_values, "none", bfd_header->flags),
 189                        len);
 190                 return;
 191             }
 192
 193             printf("BFDv%u, length: %u\n\t%s, Flags: [%s], Diagnostic: %s (0x%02x)",
 194                    version,
 195                    len,
 196                    tok2str(bfd_port_values, "unknown (%u)", port),
 197                    bittok2str(bfd_v0_flag_values, "none", bfd_header->flags),
 198                    tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(bfd_header->version_diag)),
 199                    BFD_EXTRACT_DIAG(bfd_header->version_diag));
 200
 201             printf("\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u",
 202                    bfd_header->detect_time_multiplier,
 203                    bfd_header->detect_time_multiplier * EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000,
 204                    bfd_header->length);
 205
 206
 207             printf("\n\tMy Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->my_discriminator));
 208             printf(", Your Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->your_discriminator));
 209             printf("\n\t  Desired min Tx Interval:    %4u ms", EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000);
 210             printf("\n\t  Required min Rx Interval:   %4u ms", EXTRACT_32BITS(bfd_header->required_min_rx_interval)/1000);
 211             printf("\n\t  Required min Echo Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_echo_interval)/1000);
 212             break;
 213
 214             /* BFDv1 */
 215         case (BFD_CONTROL_PORT << 8 | 1):
 216             if (vflag < 1 )
 217             {
 218                 printf("BFDv%u, %s, State %s, Flags: [%s], length: %u",
 219                        version,
 220                        tok2str(bfd_port_values, "unknown (%u)", port),
 221                        tok2str(bfd_v1_state_values, "unknown (%u)", (bfd_header->flags & 0xc0) >> 6),
 222                        bittok2str(bfd_v1_flag_values, "none", bfd_header->flags & 0x3f),
 223                        len);
 224                 return;
 225             }
 226
 227             printf("BFDv%u, length: %u\n\t%s, State %s, Flags: [%s], Diagnostic: %s (0x%02x)",
 228                    version,
 229                    len,
 230                    tok2str(bfd_port_values, "unknown (%u)", port),
 231                    tok2str(bfd_v1_state_values, "unknown (%u)", (bfd_header->flags & 0xc0) >> 6),
 232                    bittok2str(bfd_v1_flag_values, "none", bfd_header->flags & 0x3f),
 233                    tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(bfd_header->version_diag)),
 234                    BFD_EXTRACT_DIAG(bfd_header->version_diag));
 235
 236             printf("\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u",
 237                    bfd_header->detect_time_multiplier,
 238                    bfd_header->detect_time_multiplier * EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000,
 239                    bfd_header->length);
 240
 241
 242             printf("\n\tMy Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->my_discriminator));
 243             printf(", Your Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->your_discriminator));
 244             printf("\n\t  Desired min Tx Interval:    %4u ms", EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000);
 245             printf("\n\t  Required min Rx Interval:   %4u ms", EXTRACT_32BITS(bfd_header->required_min_rx_interval)/1000);
 246             printf("\n\t  Required min Echo Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_echo_interval)/1000);
 247
 248             if (bfd_header->flags & BFD_FLAG_AUTH) {
 249                 pptr += sizeof (const struct bfd_header_t);
 250                 bfd_auth_header = (const struct bfd_auth_header_t *)pptr;
 251                 TCHECK2(*bfd_auth_header, sizeof(const struct bfd_auth_header_t));
 252                 printf("\n\t%s (%u) Authentication, length %u present",
 253                        tok2str(bfd_v1_authentication_values,"Unknown",bfd_auth_header->auth_type),
 254                        bfd_auth_header->auth_type,
 255                        bfd_auth_header->auth_len);
 256             }
 257             break;
 258
 259             /* BFDv0 */
 260         case (BFD_ECHO_PORT << 8): /* not yet supported - fall through */
 261             /* BFDv1 */
 262         case (BFD_ECHO_PORT << 8 | 1):
 263
 264         default:
 265             printf("BFD, %s, length: %u",
 266                    tok2str(bfd_port_values, "unknown (%u)", port),
 267                    len);
 268             if (vflag >= 1) {
 269                     if(!print_unknown_data(gndo, pptr,"\n\t",len))
 270                             return;
 271             }
 272             break;
 273         }
 274         return;
 275
 276 trunc:
 277         printf("[|BFD]");
 278 }
 279 /*
 280  * Local Variables:
 281  * c-style: whitesmith
 282  * c-basic-offset: 8
 283  * End:
 284  */