From Hannes Gredler: Add support for Bi-directional Fault Detection (BFD).

svn path=/trunk/; revision=9068

1 files changed, 273 insertions, 0 deletions

diff --git a/packet-bfd.c b/packet-bfd.c
new file mode 100644
index 0000000000..3ebdfbf9a3
--- /dev/null
+++ b/packet-bfd.c
@@ -0,0 +1,273 @@
+/* packet-bfd.c
+ * Routines for Bi-directional Fault Detection (BFD) message dissection
+ *
+ * Copyright 2003, Hannes Gredler <hannes@juniper.net>
+ *
+ * $Id: packet-bfd.c,v 1.1 2003/11/23 22:00:48 gerald Exp $
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@ethereal.com>
+ * Copyright 1998 Gerald Combs
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+
+#include <string.h>
+#include <glib.h>
+#include <epan/packet.h>
+
+#define UDP_PORT_BFD_CONTROL 3784 /* draft-katz-ward-bfd-v4v6-1hop-00.txt */
+
+static const value_string bfd_control_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" },
+    { 0, NULL }
+};
+
+static const value_string bfd_control_flag_values[] = {
+    { 0x80,	"I Hear You" },
+    { 0x40,	"Demand" },
+    { 0x20,	"Poll" },
+    { 0x10,	"Final" },
+    { 0x08,	"Reserved" },
+    { 0x04,	"Reserved" },
+    { 0x02,	"Reserved" },
+    { 0x01,	"Reserved" },
+    { 0, NULL }
+};
+
+static gint proto_bfd = -1;
+
+static gint hf_bfd_version = -1;
+static gint hf_bfd_diag = -1;
+static gint hf_bfd_flags = -1;
+static gint hf_bfd_detect_time_multiplier = -1;
+static gint hf_bfd_my_discriminator = -1;
+static gint hf_bfd_your_discriminator = -1;
+static gint hf_bfd_desired_min_tx_interval = -1;
+static gint hf_bfd_required_min_rx_interval = -1;
+static gint hf_bfd_required_min_echo_interval = -1;
+
+static gint ett_bfd = -1;
+
+/*
+ * Control packet, 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                 |
+ *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+
+static void dissect_bfd_control(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+    gint bfd_version = -1;
+    gint bfd_diag = -1;
+    gint bfd_flags = -1;
+    gint bfd_detect_time_multiplier = -1;
+    gint bfd_length = -1;
+    gint bfd_my_discriminator = -1;
+    gint bfd_your_discriminator = -1;
+    gint bfd_desired_min_tx_interval = -1;
+    gint bfd_required_min_rx_interval = -1;
+    gint bfd_required_min_echo_interval = -1;
+
+    proto_item *ti;
+    proto_tree *bfd_tree;
+    
+    if (check_col(pinfo->cinfo, COL_PROTOCOL))
+        col_set_str(pinfo->cinfo, COL_PROTOCOL, "BFD Control");
+    if (check_col(pinfo->cinfo, COL_INFO))
+        col_clear(pinfo->cinfo, COL_INFO);
+
+    bfd_version = ((tvb_get_guint8(tvb, 0) & 0xe0) >> 5);
+    bfd_diag = (tvb_get_guint8(tvb, 0) & 0x1f);
+    bfd_flags = tvb_get_guint8(tvb, 1);
+    bfd_detect_time_multiplier = tvb_get_guint8(tvb, 2);
+    bfd_length = tvb_get_guint8(tvb, 3);
+
+    bfd_my_discriminator = tvb_get_ntohl(tvb, 4);
+    bfd_your_discriminator = tvb_get_ntohl(tvb, 8);
+    bfd_desired_min_tx_interval = tvb_get_ntohl(tvb, 12);
+    bfd_required_min_rx_interval = tvb_get_ntohl(tvb, 16);
+    bfd_required_min_echo_interval = tvb_get_ntohl(tvb, 20);
+
+    if (check_col(pinfo->cinfo, COL_INFO)) {
+        col_add_fstr(pinfo->cinfo, COL_INFO, "Diag: %s, Flags: %s",
+                     val_to_str(bfd_diag, bfd_control_diag_values, "UNKNOWN"),
+                     decode_enumerated_bitfield(bfd_flags,
+                                            0xf0,
+                                            8,
+                                            bfd_control_flag_values,
+                                            "%s"));
+    }
+
+    if (tree) {
+        ti = proto_tree_add_protocol_format(tree, proto_bfd, tvb, 0, -1,
+                                            "BFD Control message");
+
+        bfd_tree = proto_item_add_subtree(ti, ett_bfd);
+
+        ti = proto_tree_add_uint(bfd_tree, hf_bfd_version, tvb, 0,
+                                 1, bfd_version);
+
+        ti = proto_tree_add_uint(bfd_tree, hf_bfd_diag, tvb, 0,
+                                 1, bfd_diag);
+
+        ti = proto_tree_add_text ( bfd_tree, tvb, 1, 1, "Message Flags: %s",
+                                   decode_enumerated_bitfield(bfd_flags,
+                                                              0xf0,
+                                                              8,
+                                                              bfd_control_flag_values,
+                                                              "%s"));
+
+        ti = proto_tree_add_uint_format(bfd_tree, hf_bfd_detect_time_multiplier, tvb, 2,
+                                        1, bfd_detect_time_multiplier,
+                                        "%s: %u (= %u ms Detection time)",
+                                        proto_registrar_get_nth(hf_bfd_detect_time_multiplier) -> name,
+                                        bfd_detect_time_multiplier,
+                                        bfd_detect_time_multiplier * bfd_desired_min_tx_interval/1000);
+
+        ti = proto_tree_add_text ( bfd_tree, tvb, 3, 1, "Message Length: %u Bytes", bfd_length );
+        
+        ti = proto_tree_add_uint(bfd_tree, hf_bfd_my_discriminator, tvb, 4,
+                                 4, bfd_my_discriminator);
+
+        ti = proto_tree_add_uint(bfd_tree, hf_bfd_your_discriminator, tvb, 8,
+                                 4, bfd_your_discriminator);
+
+        ti = proto_tree_add_uint_format(bfd_tree, hf_bfd_desired_min_tx_interval, tvb, 12,
+                                        4, bfd_desired_min_tx_interval,
+                                        "%s: %4u ms",
+                                        proto_registrar_get_nth(hf_bfd_desired_min_tx_interval) -> name,
+                                        bfd_desired_min_tx_interval/1000);
+
+        ti = proto_tree_add_uint_format(bfd_tree, hf_bfd_required_min_rx_interval, tvb, 16,
+                                        4, bfd_required_min_rx_interval,
+                                        "%s: %4u ms",
+                                        proto_registrar_get_nth(hf_bfd_required_min_rx_interval) -> name,
+                                        bfd_required_min_rx_interval/1000);
+
+        ti = proto_tree_add_uint_format(bfd_tree, hf_bfd_required_min_echo_interval, tvb, 20,
+                                        4, bfd_required_min_echo_interval,
+                                        "%s: %4u ms",
+                                        proto_registrar_get_nth(hf_bfd_required_min_echo_interval) -> name,
+                                        bfd_required_min_echo_interval/1000);
+
+    }
+    return;
+}
+
+/* Register the protocol with Ethereal */
+void proto_register_bfd(void)
+{
+
+    /* Setup list of header fields */
+    static hf_register_info hf[] = {
+        { &hf_bfd_version,
+          { "Protocol Version", "bfd.version",
+            FT_UINT8, BASE_DEC, NULL , 0xe0,
+            "", HFILL }
+        },
+        { &hf_bfd_diag,
+          { "Diagnostic Code", "bfd.diag",
+            FT_UINT8, BASE_HEX, VALS(bfd_control_diag_values), 0x1f,
+            "", HFILL }
+        },
+        { &hf_bfd_flags,
+          { "Message Flags", "bfd.flags",
+            FT_UINT8, BASE_HEX, NULL, 0xf0,
+            "", HFILL }
+        },
+        { &hf_bfd_detect_time_multiplier,
+          { "Detect Time Multiplier", "bfd.detect_time_multiplier",
+            FT_UINT8, BASE_DEC, NULL, 0x0,
+            "", HFILL }
+        },
+        { &hf_bfd_my_discriminator,
+          { "My Discriminator", "bfd.my_discriminator",
+            FT_UINT32, BASE_HEX, NULL, 0x0,
+            "", HFILL }
+        },
+        { &hf_bfd_your_discriminator,
+          { "Your Discriminator", "bfd.your_discriminator",
+            FT_UINT32, BASE_HEX, NULL, 0x0,
+            "", HFILL }
+        },
+        { &hf_bfd_desired_min_tx_interval,
+          { "Desired Min TX Interval", "bfd.desired_min_tx_interval",
+            FT_UINT32, BASE_DEC, NULL, 0x0,
+            "", HFILL }
+        },
+        { &hf_bfd_required_min_rx_interval,
+          { "Required Min RX Interval", "bfd.required_min_rx_interval",
+            FT_UINT32, BASE_DEC, NULL, 0x0,
+            "", HFILL }
+        },
+        { &hf_bfd_required_min_echo_interval,
+          { "Required Min Echo Interval", "bfd.required_min_echo_interval",
+            FT_UINT32, BASE_DEC, NULL, 0x0,
+            "", HFILL }
+        },
+    };
+
+    /* Setup protocol subtree array */
+    static gint *ett[] = {
+        &ett_bfd,
+    };
+
+    /* Register the protocol name and description */
+    proto_bfd = proto_register_protocol("Bi-directional Fault Detection Control Message",
+                                        "BFD Control",
+                                        "bfdcontrol");
+
+    /* Required function calls to register the header fields and subtrees used */
+    proto_register_field_array(proto_bfd, hf, array_length(hf));
+    proto_register_subtree_array(ett, array_length(ett));
+}
+
+void
+proto_reg_handoff_bfd(void)
+{
+    dissector_handle_t bfd_control_handle;
+
+    bfd_control_handle = create_dissector_handle(dissect_bfd_control, proto_bfd);
+    dissector_add("udp.port", UDP_PORT_BFD_CONTROL, bfd_control_handle);
+}