283 lines
11 KiB
C
283 lines
11 KiB
C
/*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code
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* distributions retain the above copyright notice and this paragraph
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* in its entirety, and (2) distributions including binary code include
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* the above copyright notice and this paragraph in its entirety in
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* the documentation or other materials provided with the distribution.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND
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* WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
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* LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE.
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*
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* Original code by Hannes Gredler (hannes@juniper.net)
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*/
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#define NETDISSECT_REWORKED
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#include "interface.h"
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#include "extract.h"
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#include "udp.h"
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/*
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* Control packet, BFDv0, draft-katz-ward-bfd-01.txt
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*
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |Vers | Diag |H|D|P|F| Rsvd | Detect Mult | Length |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | My Discriminator |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Your Discriminator |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Desired Min TX Interval |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Required Min RX Interval |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Required Min Echo RX Interval |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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/*
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* Control packet, BFDv1, draft-ietf-bfd-base-02.txt
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*
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |Vers | Diag |Sta|P|F|C|A|D|R| Detect Mult | Length |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | My Discriminator |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Your Discriminator |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Desired Min TX Interval |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Required Min RX Interval |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Required Min Echo RX Interval |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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struct bfd_header_t {
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uint8_t version_diag;
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uint8_t flags;
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uint8_t detect_time_multiplier;
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uint8_t length;
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uint8_t my_discriminator[4];
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uint8_t your_discriminator[4];
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uint8_t desired_min_tx_interval[4];
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uint8_t required_min_rx_interval[4];
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uint8_t required_min_echo_interval[4];
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};
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/*
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* An optional Authentication Header may be present
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*
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Auth Type | Auth Len | Authentication Data... |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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struct bfd_auth_header_t {
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uint8_t auth_type;
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uint8_t auth_len;
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uint8_t auth_data;
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};
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static const struct tok bfd_v1_authentication_values[] = {
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{ 0, "Reserved" },
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{ 1, "Simple Password" },
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{ 2, "Keyed MD5" },
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{ 3, "Meticulous Keyed MD5" },
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{ 4, "Keyed SHA1" },
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{ 5, "Meticulous Keyed SHA1" },
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{ 0, NULL }
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};
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#define BFD_EXTRACT_VERSION(x) (((x)&0xe0)>>5)
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#define BFD_EXTRACT_DIAG(x) ((x)&0x1f)
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static const struct tok bfd_port_values[] = {
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{ BFD_CONTROL_PORT, "Control" },
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{ BFD_ECHO_PORT, "Echo" },
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{ 0, NULL }
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};
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static const struct tok bfd_diag_values[] = {
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{ 0, "No Diagnostic" },
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{ 1, "Control Detection Time Expired" },
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{ 2, "Echo Function Failed" },
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{ 3, "Neighbor Signaled Session Down" },
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{ 4, "Forwarding Plane Reset" },
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{ 5, "Path Down" },
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{ 6, "Concatenated Path Down" },
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{ 7, "Administratively Down" },
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{ 8, "Reverse Concatenated Path Down" },
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{ 0, NULL }
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};
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static const struct tok bfd_v0_flag_values[] = {
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{ 0x80, "I Hear You" },
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{ 0x40, "Demand" },
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{ 0x20, "Poll" },
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{ 0x10, "Final" },
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{ 0x08, "Reserved" },
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{ 0x04, "Reserved" },
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{ 0x02, "Reserved" },
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{ 0x01, "Reserved" },
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{ 0, NULL }
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};
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#define BFD_FLAG_AUTH 0x04
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static const struct tok bfd_v1_flag_values[] = {
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{ 0x20, "Poll" },
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{ 0x10, "Final" },
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{ 0x08, "Control Plane Independent" },
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{ BFD_FLAG_AUTH, "Authentication Present" },
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{ 0x02, "Demand" },
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{ 0x01, "Reserved" },
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{ 0, NULL }
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};
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static const struct tok bfd_v1_state_values[] = {
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{ 0, "AdminDown" },
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{ 1, "Down" },
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{ 2, "Init" },
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{ 3, "Up" },
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{ 0, NULL }
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};
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void
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bfd_print(netdissect_options *ndo, register const u_char *pptr,
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register u_int len, register u_int port)
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{
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const struct bfd_header_t *bfd_header;
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const struct bfd_auth_header_t *bfd_auth_header;
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uint8_t version = 0;
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bfd_header = (const struct bfd_header_t *)pptr;
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if (port == BFD_CONTROL_PORT) {
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ND_TCHECK(*bfd_header);
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version = BFD_EXTRACT_VERSION(bfd_header->version_diag);
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} else if (port == BFD_ECHO_PORT) {
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/* Echo is BFD v1 only */
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version = 1;
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}
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switch ((port << 8) | version) {
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/* BFDv0 */
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case (BFD_CONTROL_PORT << 8):
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if (ndo->ndo_vflag < 1)
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{
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ND_PRINT((ndo, "BFDv%u, %s, Flags: [%s], length: %u",
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version,
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tok2str(bfd_port_values, "unknown (%u)", port),
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bittok2str(bfd_v0_flag_values, "none", bfd_header->flags),
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len));
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return;
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}
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ND_PRINT((ndo, "BFDv%u, length: %u\n\t%s, Flags: [%s], Diagnostic: %s (0x%02x)",
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version,
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len,
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tok2str(bfd_port_values, "unknown (%u)", port),
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bittok2str(bfd_v0_flag_values, "none", bfd_header->flags),
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tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(bfd_header->version_diag)),
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BFD_EXTRACT_DIAG(bfd_header->version_diag)));
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ND_PRINT((ndo, "\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u",
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bfd_header->detect_time_multiplier,
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bfd_header->detect_time_multiplier * EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000,
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bfd_header->length));
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ND_PRINT((ndo, "\n\tMy Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->my_discriminator)));
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ND_PRINT((ndo, ", Your Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->your_discriminator)));
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ND_PRINT((ndo, "\n\t Desired min Tx Interval: %4u ms", EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000));
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ND_PRINT((ndo, "\n\t Required min Rx Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_rx_interval)/1000));
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ND_PRINT((ndo, "\n\t Required min Echo Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_echo_interval)/1000));
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break;
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/* BFDv1 */
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case (BFD_CONTROL_PORT << 8 | 1):
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if (ndo->ndo_vflag < 1)
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{
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ND_PRINT((ndo, "BFDv%u, %s, State %s, Flags: [%s], length: %u",
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version,
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tok2str(bfd_port_values, "unknown (%u)", port),
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tok2str(bfd_v1_state_values, "unknown (%u)", (bfd_header->flags & 0xc0) >> 6),
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bittok2str(bfd_v1_flag_values, "none", bfd_header->flags & 0x3f),
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len));
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return;
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}
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ND_PRINT((ndo, "BFDv%u, length: %u\n\t%s, State %s, Flags: [%s], Diagnostic: %s (0x%02x)",
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version,
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len,
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tok2str(bfd_port_values, "unknown (%u)", port),
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tok2str(bfd_v1_state_values, "unknown (%u)", (bfd_header->flags & 0xc0) >> 6),
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bittok2str(bfd_v1_flag_values, "none", bfd_header->flags & 0x3f),
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tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(bfd_header->version_diag)),
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BFD_EXTRACT_DIAG(bfd_header->version_diag)));
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ND_PRINT((ndo, "\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u",
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bfd_header->detect_time_multiplier,
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bfd_header->detect_time_multiplier * EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000,
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bfd_header->length));
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ND_PRINT((ndo, "\n\tMy Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->my_discriminator)));
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ND_PRINT((ndo, ", Your Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->your_discriminator)));
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ND_PRINT((ndo, "\n\t Desired min Tx Interval: %4u ms", EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000));
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ND_PRINT((ndo, "\n\t Required min Rx Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_rx_interval)/1000));
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ND_PRINT((ndo, "\n\t Required min Echo Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_echo_interval)/1000));
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if (bfd_header->flags & BFD_FLAG_AUTH) {
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pptr += sizeof (const struct bfd_header_t);
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bfd_auth_header = (const struct bfd_auth_header_t *)pptr;
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ND_TCHECK2(*bfd_auth_header, sizeof(const struct bfd_auth_header_t));
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ND_PRINT((ndo, "\n\t%s (%u) Authentication, length %u present",
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tok2str(bfd_v1_authentication_values,"Unknown",bfd_auth_header->auth_type),
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bfd_auth_header->auth_type,
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bfd_auth_header->auth_len));
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}
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break;
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/* BFDv0 */
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case (BFD_ECHO_PORT << 8): /* not yet supported - fall through */
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/* BFDv1 */
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case (BFD_ECHO_PORT << 8 | 1):
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default:
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ND_PRINT((ndo, "BFD, %s, length: %u",
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tok2str(bfd_port_values, "unknown (%u)", port),
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len));
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if (ndo->ndo_vflag >= 1) {
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if(!print_unknown_data(ndo, pptr,"\n\t",len))
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return;
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}
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break;
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}
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return;
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trunc:
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ND_PRINT((ndo, "[|BFD]"));
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}
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/*
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* Local Variables:
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* c-style: whitesmith
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* c-basic-offset: 8
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* End:
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*/
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