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 (at) juniper.net) 14 */ 15 16 #ifndef lint 17 static const char rcsid[] _U_ = 18 "@(#) $Header: /tcpdump/master/tcpdump/print-bfd.c,v 1.5.2.5 2006/02/02 06:36:37 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 #include "udp.h" 35 36 /* 37 * Control packet, BFDv0, 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 /* 57 * Control packet, BFDv1, draft-ietf-bfd-base-02.txt 58 * 59 * 0 1 2 3 60 * 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 61 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 62 * |Vers | Diag |Sta|P|F|C|A|D|R| Detect Mult | Length | 63 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 64 * | My Discriminator | 65 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 66 * | Your Discriminator | 67 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 68 * | Desired Min TX Interval | 69 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 70 * | Required Min RX Interval | 71 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 72 * | Required Min Echo RX Interval | 73 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 74 */ 75 76 struct bfd_header_t { 77 u_int8_t version_diag; 78 u_int8_t flags; 79 u_int8_t detect_time_multiplier; 80 u_int8_t length; 81 u_int8_t my_discriminator[4]; 82 u_int8_t your_discriminator[4]; 83 u_int8_t desired_min_tx_interval[4]; 84 u_int8_t required_min_rx_interval[4]; 85 u_int8_t required_min_echo_interval[4]; 86 }; 87 88 /* 89 * An optional Authentication Header may be present 90 * 91 * 0 1 2 3 92 * 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 93 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 94 * | Auth Type | Auth Len | Authentication Data... | 95 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 96 */ 97 98 struct bfd_auth_header_t { 99 u_int8_t auth_type; 100 u_int8_t auth_len; 101 u_int8_t auth_data; 102 }; 103 104 static const struct tok bfd_v1_authentication_values[] = { 105 { 0, "Reserved" }, 106 { 1, "Simple Password" }, 107 { 2, "Keyed MD5" }, 108 { 3, "Meticulous Keyed MD5" }, 109 { 4, "Keyed SHA1" }, 110 { 5, "Meticulous Keyed SHA1" }, 111 { 0, NULL } 112 }; 113 114 #define BFD_EXTRACT_VERSION(x) (((x)&0xe0)>>5) 115 #define BFD_EXTRACT_DIAG(x) ((x)&0x1f) 116 117 static const struct tok bfd_port_values[] = { 118 { BFD_CONTROL_PORT, "Control" }, 119 { BFD_ECHO_PORT, "Echo" }, 120 { 0, NULL } 121 }; 122 123 124 static const struct tok bfd_diag_values[] = { 125 { 0, "No Diagnostic" }, 126 { 1, "Control Detection Time Expired" }, 127 { 2, "Echo Function Failed" }, 128 { 3, "Neighbor Signaled Session Down" }, 129 { 4, "Forwarding Plane Reset" }, 130 { 5, "Path Down" }, 131 { 6, "Concatenated Path Down" }, 132 { 7, "Administratively Down" }, 133 { 8, "Reverse Concatenated Path Down" }, 134 { 0, NULL } 135 }; 136 137 static const struct tok bfd_v0_flag_values[] = { 138 { 0x80, "I Hear You" }, 139 { 0x40, "Demand" }, 140 { 0x20, "Poll" }, 141 { 0x10, "Final" }, 142 { 0x08, "Reserved" }, 143 { 0x04, "Reserved" }, 144 { 0x02, "Reserved" }, 145 { 0x01, "Reserved" }, 146 { 0, NULL } 147 }; 148 149 #define BFD_FLAG_AUTH 0x04 150 151 static const struct tok bfd_v1_flag_values[] = { 152 { 0x20, "Poll" }, 153 { 0x10, "Final" }, 154 { 0x08, "Control Plane Independent" }, 155 { BFD_FLAG_AUTH, "Authentication Present" }, 156 { 0x02, "Demand" }, 157 { 0x01, "Reserved" }, 158 { 0, NULL } 159 }; 160 161 static const struct tok bfd_v1_state_values[] = { 162 { 0, "AdminDown" }, 163 { 1, "Down" }, 164 { 2, "Init" }, 165 { 3, "Up" }, 166 { 0, NULL } 167 }; 168 169 void 170 bfd_print(register const u_char *pptr, register u_int len, register u_int port) 171 { 172 const struct bfd_header_t *bfd_header; 173 const struct bfd_auth_header_t *bfd_auth_header; 174 u_int8_t version; 175 176 bfd_header = (const struct bfd_header_t *)pptr; 177 TCHECK(*bfd_header); 178 version = BFD_EXTRACT_VERSION(bfd_header->version_diag); 179 180 switch (port << 8 | version) { 181 182 /* BFDv0 */ 183 case (BFD_CONTROL_PORT << 8): 184 if (vflag < 1 ) 185 { 186 printf("BFDv%u, %s, Flags: [%s], length: %u", 187 version, 188 tok2str(bfd_port_values, "unknown (%u)", port), 189 bittok2str(bfd_v0_flag_values, "none", bfd_header->flags), 190 len); 191 return; 192 } 193 194 printf("BFDv%u, length: %u\n\t%s, Flags: [%s], Diagnostic: %s (0x%02x)", 195 version, 196 len, 197 tok2str(bfd_port_values, "unknown (%u)", port), 198 bittok2str(bfd_v0_flag_values, "none", bfd_header->flags), 199 tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(bfd_header->version_diag)), 200 BFD_EXTRACT_DIAG(bfd_header->version_diag)); 201 202 printf("\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u", 203 bfd_header->detect_time_multiplier, 204 bfd_header->detect_time_multiplier * EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000, 205 bfd_header->length); 206 207 208 printf("\n\tMy Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->my_discriminator)); 209 printf(", Your Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->your_discriminator)); 210 printf("\n\t Desired min Tx Interval: %4u ms", EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000); 211 printf("\n\t Required min Rx Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_rx_interval)/1000); 212 printf("\n\t Required min Echo Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_echo_interval)/1000); 213 break; 214 215 /* BFDv1 */ 216 case (BFD_CONTROL_PORT << 8 | 1): 217 if (vflag < 1 ) 218 { 219 printf("BFDv%u, %s, State %s, Flags: [%s], length: %u", 220 version, 221 tok2str(bfd_port_values, "unknown (%u)", port), 222 tok2str(bfd_v1_state_values, "unknown (%u)", (bfd_header->flags & 0xc0) >> 6), 223 bittok2str(bfd_v1_flag_values, "none", bfd_header->flags & 0x3f), 224 len); 225 return; 226 } 227 228 printf("BFDv%u, length: %u\n\t%s, State %s, Flags: [%s], Diagnostic: %s (0x%02x)", 229 version, 230 len, 231 tok2str(bfd_port_values, "unknown (%u)", port), 232 tok2str(bfd_v1_state_values, "unknown (%u)", (bfd_header->flags & 0xc0) >> 6), 233 bittok2str(bfd_v1_flag_values, "none", bfd_header->flags & 0x3f), 234 tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(bfd_header->version_diag)), 235 BFD_EXTRACT_DIAG(bfd_header->version_diag)); 236 237 printf("\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u", 238 bfd_header->detect_time_multiplier, 239 bfd_header->detect_time_multiplier * EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000, 240 bfd_header->length); 241 242 243 printf("\n\tMy Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->my_discriminator)); 244 printf(", Your Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->your_discriminator)); 245 printf("\n\t Desired min Tx Interval: %4u ms", EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000); 246 printf("\n\t Required min Rx Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_rx_interval)/1000); 247 printf("\n\t Required min Echo Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_echo_interval)/1000); 248 249 if (bfd_header->flags & BFD_FLAG_AUTH) { 250 pptr += sizeof (const struct bfd_header_t); 251 bfd_auth_header = (const struct bfd_auth_header_t *)pptr; 252 TCHECK2(*bfd_auth_header, sizeof(const struct bfd_auth_header_t)); 253 printf("\n\t%s (%u) Authentication, length %u present", 254 tok2str(bfd_v1_authentication_values,"Unknown",bfd_auth_header->auth_type), 255 bfd_auth_header->auth_type, 256 bfd_auth_header->auth_len); 257 } 258 break; 259 260 /* BFDv0 */ 261 case (BFD_ECHO_PORT << 8): /* not yet supported - fall through */ 262 /* BFDv1 */ 263 case (BFD_ECHO_PORT << 8 | 1): 264 265 default: 266 printf("BFD, %s, length: %u", 267 tok2str(bfd_port_values, "unknown (%u)", port), 268 len); 269 if (vflag >= 1) { 270 if(!print_unknown_data(pptr,"\n\t",len)) 271 return; 272 } 273 break; 274 } 275 return; 276 277 trunc: 278 printf("[|BFD]"); 279 } 280
