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-rw-r--r--print-bfd.c283
1 files changed, 283 insertions, 0 deletions
diff --git a/print-bfd.c b/print-bfd.c
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+++ b/print-bfd.c
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+/*
+ * 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 1.10 2006-02-02 06:35:52 hannes Exp $";
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <tcpdump-stdinc.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#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 = 0;
+
+ bfd_header = (const struct bfd_header_t *)pptr;
+ if (port == BFD_CONTROL_PORT) {
+ 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 (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) >> 6),
+ 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]");
+}
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