Wireshark · Ethereal-dev: [Ethereal-dev] [patch] packet-redback.c Add SmartEdge 400 tcpdump disassembly

[Florian Lohoff <flo@xxxxxxxxxx>]

Hi,
attached a start for RedBack SmartEdge 400/800 tcpdump disassembly. I
reverse engineered it from the shipped BSD tcpdump binary which has some
basic decoding features.

Comments ?

Flo
-- 
Florian Lohoff                  flo@xxxxxxxxxx             +49-171-2280134
                        Heisenberg may have been here.

Index: AUTHORS
===================================================================
--- AUTHORS	(revision 13198)
+++ AUTHORS	(working copy)
@@ -352,6 +352,7 @@
 Florian Lohoff          <flo[AT]rfc822.org> {
 	Various enhancements to RADIUS support
 	Fixes to L2TP result and error code dissection
+	Redback SmartEgde SE400/800 tcpdump disassembly
 }
 
 Jochen Friedrich        <jochen+ethereal[AT]scram.de> {
Index: epan/dissectors/Makefile.common
===================================================================
--- epan/dissectors/Makefile.common	(revision 13198)
+++ epan/dissectors/Makefile.common	(working copy)
@@ -435,6 +435,7 @@
 	packet-radiotap.c	\
 	packet-ranap.c	\
 	packet-raw.c	\
+	packet-redback.c \
 	packet-rip.c	\
 	packet-ripng.c	\
 	packet-rlogin.c	\
Index: epan/dissectors/packet-redback.c
===================================================================
--- epan/dissectors/packet-redback.c	(revision 0)
+++ epan/dissectors/packet-redback.c	(revision 0)
@@ -0,0 +1,149 @@
+/* packet-redback.c
+ *
+ * Start of RedBack SE400/800 tcpdump trace disassembly
+ * Copyright 2005 Florian Lohoff <flo@xxxxxxxxxx>
+ *
+ * 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 <glib.h>
+#include <epan/packet.h>
+#include "etypes.h"
+#include <epan/prefs.h>
+#include <epan/addr_resolv.h>
+#include "packet-ip.h"
+
+static int proto_redback = -1;
+static gint ett_redback = -1;
+
+static dissector_handle_t ipv4_handle;
+static dissector_handle_t eth_handle;
+static dissector_handle_t clnp_handle;
+static dissector_handle_t arp_handle;
+
+/* wrapper for passing the PIC type to the generic ATM dissector */
+static void
+dissect_redback(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+  guint8     l3off, dataoff, proto;
+  guint32    context, flags;
+  guint64    circuit;
+  guint16    length;
+  proto_item *ti,*tisub;
+  proto_tree *subtree = NULL;
+  tvbuff_t   *next_tvb;
+
+  context = tvb_get_ntohl(tvb, 0);
+  flags = tvb_get_ntohl(tvb, 4);
+  circuit = tvb_get_ntoh64(tvb, 8);
+
+  length = tvb_get_ntohs(tvb, 16);
+
+  proto = tvb_get_ntohs(tvb, 18);
+  l3off = tvb_get_ntohs(tvb, 20);
+  dataoff = tvb_get_ntohs(tvb, 22);
+
+  ti = proto_tree_add_text(tree, tvb, 0, length, "Redback");
+
+  subtree = proto_item_add_subtree(ti, ett_redback);  
+  tisub = proto_tree_add_text (subtree, tvb, 0, 4,
+                            "Context: 0x%08x", context);
+  tisub = proto_tree_add_text (subtree, tvb, 4, 4,
+                            "Flags: 0x%08x", flags);
+  tisub = proto_tree_add_text (subtree, tvb, 8, 8,
+                            "Circuit: 0x%" PRIx64, circuit);
+  tisub = proto_tree_add_text (subtree, tvb, 16, 2,
+                            "Length: %u", length);
+  tisub = proto_tree_add_text (subtree, tvb, 18, 2,
+                            "Protocol: %u", proto);
+  tisub = proto_tree_add_text (subtree, tvb, 20, 2,
+                            "Layer3 Offset: %u", l3off);
+  tisub = proto_tree_add_text (subtree, tvb, 22, 2,
+                            "Data Offset: %u", dataoff);
+  next_tvb = tvb_new_subset(tvb, l3off, -1, -1);
+
+  /* Mark the gap as "Data" for now */
+  if (dataoff > l3off) {
+	proto_tree_add_text (subtree, tvb, 24, l3off-24, "Data");	
+  }
+
+  /*
+   * Just a guess - In case we see a difference in dataoff vs l3off
+   * we assume there is an ethernet header. Traces from an OC12 didnt
+   * show any header in here
+   */
+  if (dataoff > l3off) {
+    call_dissector(eth_handle, next_tvb, pinfo, tree);
+  } else {
+    switch(proto) {
+      case 0x01:
+        /*
+	 * IP - We assume IPv6 has a different protocol although
+	 * i might be wrong - Havent seen any traces
+	 */
+        call_dissector(ipv4_handle, next_tvb, pinfo, tree);
+        break;
+      case 0x02:
+	/*
+	 * It is CLNP although it seem the Packet Asic fills
+	 * some data in the packet so we have a "broken" packet in
+	 * the trace
+	 */
+        call_dissector(clnp_handle, next_tvb, pinfo, tree);
+        break;
+      case 0x04:
+	/* ARP - Always eth header in front */
+        call_dissector(eth_handle, next_tvb, pinfo, tree);
+        break;
+      default:
+	tisub = proto_tree_add_text (subtree, tvb, 24, length-24, 
+				"Unknown Protocol %u", proto);
+        break;
+    }
+  }
+  return;
+}
+
+void
+proto_register_redback(void)
+{
+  static gint *ett[] = {
+    &ett_redback,
+  };
+
+  proto_redback = proto_register_protocol("Redback", "Redback", "redback");
+  proto_register_subtree_array(ett, array_length(ett));
+
+}
+
+void
+proto_reg_handoff_redback(void)
+{
+  dissector_handle_t redback_handle;
+
+  ipv4_handle = find_dissector("ip");
+  eth_handle = find_dissector("eth_withoutfcs");
+  clnp_handle = find_dissector("clnp");
+  arp_handle = find_dissector("arp");
+
+  redback_handle = create_dissector_handle(dissect_redback, proto_redback);
+  dissector_add("wtap_encap", WTAP_ENCAP_REDBACK, redback_handle);
+}
+
+
Index: wiretap/wtap.h
===================================================================
--- wiretap/wtap.h	(revision 13198)
+++ wiretap/wtap.h	(working copy)
@@ -158,9 +158,10 @@
 #define WTAP_ENCAP_GPRS_LLC			67
 #define WTAP_ENCAP_JUNIPER_ATM1			68
 #define WTAP_ENCAP_JUNIPER_ATM2			69
+#define WTAP_ENCAP_REDBACK			70
 
 /* last WTAP_ENCAP_ value + 1 */
-#define WTAP_NUM_ENCAP_TYPES			70
+#define WTAP_NUM_ENCAP_TYPES			71
 
 /* File types that can be read by wiretap.
    We support writing some many of these file types, too, so we
Index: wiretap/libpcap.c
===================================================================
--- wiretap/libpcap.c	(revision 13198)
+++ wiretap/libpcap.c	(working copy)
@@ -168,6 +168,8 @@
 	{ 10,		WTAP_ENCAP_FDDI },
 #endif
 
+	{ 32,		WTAP_ENCAP_REDBACK },
+
 	/*
 	 * 50 is DLT_PPP_SERIAL in NetBSD; it appears that DLT_PPP
 	 * on BSD (at least according to standard tcpdump) has, as

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