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 #include <sys/cdefs.h> 17 #ifndef lint 18 #if 0 19 static const char rcsid[] _U_ = 20 "@(#) Header: /tcpdump/master/tcpdump/print-bfd.c,v 1.10 2006-02-02 06:35:52 hannes Exp"; 21 #else 22 __RCSID("$NetBSD: print-bfd.c,v 1.2 2010/12/05 05:11:30 christos Exp $"); 23 #endif 24 #endif 25 26 #ifdef HAVE_CONFIG_H 27 #include "config.h" 28 #endif 29 30 #include <tcpdump-stdinc.h> 31 32 #include <stdio.h> 33 #include <stdlib.h> 34 35 #include "interface.h" 36 #include "extract.h" 37 #include "addrtoname.h" 38 39 #include "udp.h" 40 41 /* 42 * Control packet, BFDv0, draft-katz-ward-bfd-01.txt 43 * 44 * 0 1 2 3 45 * 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 46 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 47 * |Vers | Diag |H|D|P|F| Rsvd | Detect Mult | Length | 48 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 49 * | My Discriminator | 50 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 51 * | Your Discriminator | 52 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 53 * | Desired Min TX Interval | 54 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 55 * | Required Min RX Interval | 56 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 57 * | Required Min Echo RX Interval | 58 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 59 */ 60 61 /* 62 * Control packet, BFDv1, draft-ietf-bfd-base-02.txt 63 * 64 * 0 1 2 3 65 * 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 66 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 67 * |Vers | Diag |Sta|P|F|C|A|D|R| Detect Mult | Length | 68 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 69 * | My Discriminator | 70 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 71 * | Your Discriminator | 72 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 73 * | Desired Min TX Interval | 74 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 75 * | Required Min RX Interval | 76 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 77 * | Required Min Echo RX Interval | 78 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 79 */ 80 81 struct bfd_header_t { 82 u_int8_t version_diag; 83 u_int8_t flags; 84 u_int8_t detect_time_multiplier; 85 u_int8_t length; 86 u_int8_t my_discriminator[4]; 87 u_int8_t your_discriminator[4]; 88 u_int8_t desired_min_tx_interval[4]; 89 u_int8_t required_min_rx_interval[4]; 90 u_int8_t required_min_echo_interval[4]; 91 }; 92 93 /* 94 * An optional Authentication Header may be present 95 * 96 * 0 1 2 3 97 * 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 98 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 99 * | Auth Type | Auth Len | Authentication Data... | 100 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 101 */ 102 103 struct bfd_auth_header_t { 104 u_int8_t auth_type; 105 u_int8_t auth_len; 106 u_int8_t auth_data; 107 }; 108 109 static const struct tok bfd_v1_authentication_values[] = { 110 { 0, "Reserved" }, 111 { 1, "Simple Password" }, 112 { 2, "Keyed MD5" }, 113 { 3, "Meticulous Keyed MD5" }, 114 { 4, "Keyed SHA1" }, 115 { 5, "Meticulous Keyed SHA1" }, 116 { 0, NULL } 117 }; 118 119 #define BFD_EXTRACT_VERSION(x) (((x)&0xe0)>>5) 120 #define BFD_EXTRACT_DIAG(x) ((x)&0x1f) 121 122 static const struct tok bfd_port_values[] = { 123 { BFD_CONTROL_PORT, "Control" }, 124 { BFD_ECHO_PORT, "Echo" }, 125 { 0, NULL } 126 }; 127 128 129 static const struct tok bfd_diag_values[] = { 130 { 0, "No Diagnostic" }, 131 { 1, "Control Detection Time Expired" }, 132 { 2, "Echo Function Failed" }, 133 { 3, "Neighbor Signaled Session Down" }, 134 { 4, "Forwarding Plane Reset" }, 135 { 5, "Path Down" }, 136 { 6, "Concatenated Path Down" }, 137 { 7, "Administratively Down" }, 138 { 8, "Reverse Concatenated Path Down" }, 139 { 0, NULL } 140 }; 141 142 static const struct tok bfd_v0_flag_values[] = { 143 { 0x80, "I Hear You" }, 144 { 0x40, "Demand" }, 145 { 0x20, "Poll" }, 146 { 0x10, "Final" }, 147 { 0x08, "Reserved" }, 148 { 0x04, "Reserved" }, 149 { 0x02, "Reserved" }, 150 { 0x01, "Reserved" }, 151 { 0, NULL } 152 }; 153 154 #define BFD_FLAG_AUTH 0x04 155 156 static const struct tok bfd_v1_flag_values[] = { 157 { 0x20, "Poll" }, 158 { 0x10, "Final" }, 159 { 0x08, "Control Plane Independent" }, 160 { BFD_FLAG_AUTH, "Authentication Present" }, 161 { 0x02, "Demand" }, 162 { 0x01, "Reserved" }, 163 { 0, NULL } 164 }; 165 166 static const struct tok bfd_v1_state_values[] = { 167 { 0, "AdminDown" }, 168 { 1, "Down" }, 169 { 2, "Init" }, 170 { 3, "Up" }, 171 { 0, NULL } 172 }; 173 174 void 175 bfd_print(register const u_char *pptr, register u_int len, register u_int port) 176 { 177 const struct bfd_header_t *bfd_header; 178 const struct bfd_auth_header_t *bfd_auth_header; 179 u_int8_t version = 0; 180 181 bfd_header = (const struct bfd_header_t *)pptr; 182 if (port == BFD_CONTROL_PORT) { 183 TCHECK(*bfd_header); 184 version = BFD_EXTRACT_VERSION(bfd_header->version_diag); 185 } else if (port == BFD_ECHO_PORT) { 186 /* Echo is BFD v1 only */ 187 version = 1; 188 } 189 switch ((port << 8) | version) { 190 191 /* BFDv0 */ 192 case (BFD_CONTROL_PORT << 8): 193 if (vflag < 1 ) 194 { 195 printf("BFDv%u, %s, Flags: [%s], length: %u", 196 version, 197 tok2str(bfd_port_values, "unknown (%u)", port), 198 bittok2str(bfd_v0_flag_values, "none", bfd_header->flags), 199 len); 200 return; 201 } 202 203 printf("BFDv%u, length: %u\n\t%s, Flags: [%s], Diagnostic: %s (0x%02x)", 204 version, 205 len, 206 tok2str(bfd_port_values, "unknown (%u)", port), 207 bittok2str(bfd_v0_flag_values, "none", bfd_header->flags), 208 tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(bfd_header->version_diag)), 209 BFD_EXTRACT_DIAG(bfd_header->version_diag)); 210 211 printf("\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u", 212 bfd_header->detect_time_multiplier, 213 bfd_header->detect_time_multiplier * EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000, 214 bfd_header->length); 215 216 217 printf("\n\tMy Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->my_discriminator)); 218 printf(", Your Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->your_discriminator)); 219 printf("\n\t Desired min Tx Interval: %4u ms", EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000); 220 printf("\n\t Required min Rx Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_rx_interval)/1000); 221 printf("\n\t Required min Echo Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_echo_interval)/1000); 222 break; 223 224 /* BFDv1 */ 225 case (BFD_CONTROL_PORT << 8 | 1): 226 if (vflag < 1 ) 227 { 228 printf("BFDv%u, %s, State %s, Flags: [%s], length: %u", 229 version, 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 len); 234 return; 235 } 236 237 printf("BFDv%u, length: %u\n\t%s, State %s, Flags: [%s], Diagnostic: %s (0x%02x)", 238 version, 239 len, 240 tok2str(bfd_port_values, "unknown (%u)", port), 241 tok2str(bfd_v1_state_values, "unknown (%u)", (bfd_header->flags & 0xc0) >> 6), 242 bittok2str(bfd_v1_flag_values, "none", bfd_header->flags & 0x3f), 243 tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(bfd_header->version_diag)), 244 BFD_EXTRACT_DIAG(bfd_header->version_diag)); 245 246 printf("\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u", 247 bfd_header->detect_time_multiplier, 248 bfd_header->detect_time_multiplier * EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000, 249 bfd_header->length); 250 251 252 printf("\n\tMy Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->my_discriminator)); 253 printf(", Your Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->your_discriminator)); 254 printf("\n\t Desired min Tx Interval: %4u ms", EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000); 255 printf("\n\t Required min Rx Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_rx_interval)/1000); 256 printf("\n\t Required min Echo Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_echo_interval)/1000); 257 258 if (bfd_header->flags & BFD_FLAG_AUTH) { 259 pptr += sizeof (const struct bfd_header_t); 260 bfd_auth_header = (const struct bfd_auth_header_t *)pptr; 261 TCHECK2(*bfd_auth_header, sizeof(const struct bfd_auth_header_t)); 262 printf("\n\t%s (%u) Authentication, length %u present", 263 tok2str(bfd_v1_authentication_values,"Unknown",bfd_auth_header->auth_type), 264 bfd_auth_header->auth_type, 265 bfd_auth_header->auth_len); 266 } 267 break; 268 269 /* BFDv0 */ 270 case (BFD_ECHO_PORT << 8): /* not yet supported - fall through */ 271 /* BFDv1 */ 272 case (BFD_ECHO_PORT << 8 | 1): 273 274 default: 275 printf("BFD, %s, length: %u", 276 tok2str(bfd_port_values, "unknown (%u)", port), 277 len); 278 if (vflag >= 1) { 279 if(!print_unknown_data(pptr,"\n\t",len)) 280 return; 281 } 282 break; 283 } 284 return; 285 286 trunc: 287 printf("[|BFD]"); 288 } 289