| /* |
| * 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) |
| */ |
| |
| #define NETDISSECT_REWORKED |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <tcpdump-stdinc.h> |
| |
| #include "interface.h" |
| #include "extract.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 { |
| uint8_t version_diag; |
| uint8_t flags; |
| uint8_t detect_time_multiplier; |
| uint8_t length; |
| uint8_t my_discriminator[4]; |
| uint8_t your_discriminator[4]; |
| uint8_t desired_min_tx_interval[4]; |
| uint8_t required_min_rx_interval[4]; |
| uint8_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 { |
| uint8_t auth_type; |
| uint8_t auth_len; |
| uint8_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(netdissect_options *ndo, 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; |
| uint8_t version = 0; |
| |
| bfd_header = (const struct bfd_header_t *)pptr; |
| if (port == BFD_CONTROL_PORT) { |
| ND_TCHECK(*bfd_header); |
| version = BFD_EXTRACT_VERSION(bfd_header->version_diag); |
| } else if (port == BFD_ECHO_PORT) { |
| /* Echo is BFD v1 only */ |
| version = 1; |
| } |
| switch ((port << 8) | version) { |
| |
| /* BFDv0 */ |
| case (BFD_CONTROL_PORT << 8): |
| if (ndo->ndo_vflag < 1) |
| { |
| ND_PRINT((ndo, "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; |
| } |
| |
| ND_PRINT((ndo, "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))); |
| |
| ND_PRINT((ndo, "\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)); |
| |
| |
| ND_PRINT((ndo, "\n\tMy Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->my_discriminator))); |
| ND_PRINT((ndo, ", Your Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->your_discriminator))); |
| ND_PRINT((ndo, "\n\t Desired min Tx Interval: %4u ms", EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000)); |
| ND_PRINT((ndo, "\n\t Required min Rx Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_rx_interval)/1000)); |
| ND_PRINT((ndo, "\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 (ndo->ndo_vflag < 1) |
| { |
| ND_PRINT((ndo, "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) >> 6), |
| bittok2str(bfd_v1_flag_values, "none", bfd_header->flags & 0x3f), |
| len)); |
| return; |
| } |
| |
| ND_PRINT((ndo, "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))); |
| |
| ND_PRINT((ndo, "\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)); |
| |
| |
| ND_PRINT((ndo, "\n\tMy Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->my_discriminator))); |
| ND_PRINT((ndo, ", Your Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->your_discriminator))); |
| ND_PRINT((ndo, "\n\t Desired min Tx Interval: %4u ms", EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000)); |
| ND_PRINT((ndo, "\n\t Required min Rx Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_rx_interval)/1000)); |
| ND_PRINT((ndo, "\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; |
| ND_TCHECK2(*bfd_auth_header, sizeof(const struct bfd_auth_header_t)); |
| ND_PRINT((ndo, "\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: |
| ND_PRINT((ndo, "BFD, %s, length: %u", |
| tok2str(bfd_port_values, "unknown (%u)", port), |
| len)); |
| if (ndo->ndo_vflag >= 1) { |
| if(!print_unknown_data(ndo, pptr,"\n\t",len)) |
| return; |
| } |
| break; |
| } |
| return; |
| |
| trunc: |
| ND_PRINT((ndo, "[|BFD]")); |
| } |
| /* |
| * Local Variables: |
| * c-style: whitesmith |
| * c-basic-offset: 8 |
| * End: |
| */ |
