/* * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that: (1) source code * distributions retain the above copyright notice and this paragraph * in its entirety, and (2) distributions including binary code include * the above copyright notice and this paragraph in its entirety in * the documentation or other materials provided with the distribution. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE. * * Original code by Hannes Gredler (hannes@juniper.net) */ #ifndef lint static const char rcsid[] _U_ = "@(#) $Header: /tcpdump/master/tcpdump/print-bfd.c,v 1.5.2.4 2005/04/28 09:28:47 hannes Exp $"; #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include "interface.h" #include "extract.h" #include "addrtoname.h" #include "udp.h" /* * Control packet, BFDv0, draft-katz-ward-bfd-01.txt * * 0 1 2 3 * 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 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * |Vers | Diag |H|D|P|F| Rsvd | Detect Mult | Length | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | My Discriminator | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Your Discriminator | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Desired Min TX Interval | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Required Min RX Interval | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Required Min Echo RX Interval | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ /* * Control packet, BFDv1, draft-ietf-bfd-base-02.txt * * 0 1 2 3 * 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 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * |Vers | Diag |Sta|P|F|C|A|D|R| Detect Mult | Length | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | My Discriminator | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Your Discriminator | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Desired Min TX Interval | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Required Min RX Interval | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Required Min Echo RX Interval | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ struct bfd_header_t { u_int8_t version_diag; u_int8_t flags; u_int8_t detect_time_multiplier; u_int8_t length; u_int8_t my_discriminator[4]; u_int8_t your_discriminator[4]; u_int8_t desired_min_tx_interval[4]; u_int8_t required_min_rx_interval[4]; u_int8_t required_min_echo_interval[4]; }; /* * An optional Authentication Header may be present * * 0 1 2 3 * 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 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Auth Type | Auth Len | Authentication Data... | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ struct bfd_auth_header_t { u_int8_t auth_type; u_int8_t auth_len; u_int8_t auth_data; }; static const struct tok bfd_v1_authentication_values[] = { { 0, "Reserved" }, { 1, "Simple Password" }, { 2, "Keyed MD5" }, { 3, "Meticulous Keyed MD5" }, { 4, "Keyed SHA1" }, { 5, "Meticulous Keyed SHA1" }, { 0, NULL } }; #define BFD_EXTRACT_VERSION(x) (((x)&0xe0)>>5) #define BFD_EXTRACT_DIAG(x) ((x)&0x1f) static const struct tok bfd_port_values[] = { { BFD_CONTROL_PORT, "Control" }, { BFD_ECHO_PORT, "Echo" }, { 0, NULL } }; static const struct tok bfd_diag_values[] = { { 0, "No Diagnostic" }, { 1, "Control Detection Time Expired" }, { 2, "Echo Function Failed" }, { 3, "Neighbor Signaled Session Down" }, { 4, "Forwarding Plane Reset" }, { 5, "Path Down" }, { 6, "Concatenated Path Down" }, { 7, "Administratively Down" }, { 8, "Reverse Concatenated Path Down" }, { 0, NULL } }; static const struct tok bfd_v0_flag_values[] = { { 0x80, "I Hear You" }, { 0x40, "Demand" }, { 0x20, "Poll" }, { 0x10, "Final" }, { 0x08, "Reserved" }, { 0x04, "Reserved" }, { 0x02, "Reserved" }, { 0x01, "Reserved" }, { 0, NULL } }; #define BFD_FLAG_AUTH 0x04 static const struct tok bfd_v1_flag_values[] = { { 0x20, "Poll" }, { 0x10, "Final" }, { 0x08, "Control Plane Independent" }, { BFD_FLAG_AUTH, "Authentication Present" }, { 0x02, "Demand" }, { 0x01, "Reserved" }, { 0, NULL } }; static const struct tok bfd_v1_state_values[] = { { 0, "AdminDown" }, { 1, "Down" }, { 2, "Init" }, { 3, "Up" }, { 0, NULL } }; void bfd_print(register const u_char *pptr, register u_int len, register u_int port) { const struct bfd_header_t *bfd_header; const struct bfd_auth_header_t *bfd_auth_header; u_int8_t version; bfd_header = (const struct bfd_header_t *)pptr; TCHECK(*bfd_header); version = BFD_EXTRACT_VERSION(bfd_header->version_diag); switch (port << 8 | version) { /* BFDv0 */ case (BFD_CONTROL_PORT << 8): if (vflag < 1 ) { printf("BFDv%u, %s, Flags: [%s], length: %u", version, tok2str(bfd_port_values, "unknown (%u)", port), bittok2str(bfd_v0_flag_values, "none", bfd_header->flags), len); return; } printf("BFDv%u, length: %u\n\t%s, Flags: [%s], Diagnostic: %s (0x%02x)", version, len, tok2str(bfd_port_values, "unknown (%u)", port), bittok2str(bfd_v0_flag_values, "none", bfd_header->flags), tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(bfd_header->version_diag)), BFD_EXTRACT_DIAG(bfd_header->version_diag)); printf("\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u", bfd_header->detect_time_multiplier, bfd_header->detect_time_multiplier * EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000, bfd_header->length); printf("\n\tMy Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->my_discriminator)); printf(", Your Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->your_discriminator)); printf("\n\t Desired min Tx Interval: %4u ms", EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000); printf("\n\t Required min Rx Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_rx_interval)/1000); printf("\n\t Required min Echo Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_echo_interval)/1000); break; /* BFDv1 */ case (BFD_CONTROL_PORT << 8 | 1): if (vflag < 1 ) { printf("BFDv%u, %s, State %s, Flags: [%s], length: %u", version, tok2str(bfd_port_values, "unknown (%u)", port), tok2str(bfd_v1_state_values, "unknown (%u)", bfd_header->flags & 0xc0), bittok2str(bfd_v1_flag_values, "none", bfd_header->flags & 0x3f), len); return; } printf("BFDv%u, length: %u\n\t%s, State %s, Flags: [%s], Diagnostic: %s (0x%02x)", version, len, tok2str(bfd_port_values, "unknown (%u)", port), tok2str(bfd_v1_state_values, "unknown (%u)", (bfd_header->flags & 0xc0) >> 6), bittok2str(bfd_v1_flag_values, "none", bfd_header->flags & 0x3f), tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(bfd_header->version_diag)), BFD_EXTRACT_DIAG(bfd_header->version_diag)); printf("\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u", bfd_header->detect_time_multiplier, bfd_header->detect_time_multiplier * EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000, bfd_header->length); printf("\n\tMy Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->my_discriminator)); printf(", Your Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->your_discriminator)); printf("\n\t Desired min Tx Interval: %4u ms", EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000); printf("\n\t Required min Rx Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_rx_interval)/1000); printf("\n\t Required min Echo Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_echo_interval)/1000); if (bfd_header->flags & BFD_FLAG_AUTH) { pptr += sizeof (const struct bfd_header_t); bfd_auth_header = (const struct bfd_auth_header_t *)pptr; TCHECK2(*bfd_auth_header, sizeof(const struct bfd_auth_header_t)); printf("\n\t%s (%u) Authentication, length %u present", tok2str(bfd_v1_authentication_values,"Unknown",bfd_auth_header->auth_type), bfd_auth_header->auth_type, bfd_auth_header->auth_len); } break; /* BFDv0 */ case (BFD_ECHO_PORT << 8): /* not yet supported - fall through */ /* BFDv1 */ case (BFD_ECHO_PORT << 8 | 1): default: printf("BFD, %s, length: %u", tok2str(bfd_port_values, "unknown (%u)", port), len); if (vflag >= 1) { if(!print_unknown_data(pptr,"\n\t",len)) return; } break; } return; trunc: printf("[|BFD]"); }