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 } 161