Adding upstream version 4.2.2.upstream/4.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 200 insertions, 0 deletions

diff --git a/epan/dissectors/packet-tte.c b/epan/dissectors/packet-tte.c
new file mode 100644
index 00000000..200f7107
--- /dev/null
+++ b/epan/dissectors/packet-tte.c
@@ -0,0 +1,200 @@
+/* packet-tte.c
+ * Routines for Time Triggered Ethernet dissection
+ *
+ * Author: Valentin Ecker, valentin.ecker (AT) tttech.com
+ * Author: Benjamin Roch, benjamin.roch (AT) tttech.com
+ *
+ * TTTech Computertechnik AG, Austria.
+ * https://www.tttech.com/technologies/time-triggered-ethernet/
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "config.h"
+
+#include <epan/packet.h>
+#include <epan/prefs.h>
+#include <epan/etypes.h>
+
+#include "packet-tte.h"
+
+void proto_register_tte(void);
+void proto_reg_handoff_tte(void);
+
+static dissector_handle_t ethertype_handle;
+
+/* Initialize the protocol and registered fields */
+static int proto_tte = -1;
+
+static int hf_eth_dst       = -1;
+static int hf_tte_dst_cf    = -1;
+static int hf_tte_ctid      = -1;
+static int hf_eth_src       = -1;
+static int hf_eth_type      = -1;
+
+/* preference value pointers */
+static guint32    tte_pref_ct_marker    = 0xFFFFFFFF;
+static guint32    tte_pref_ct_mask      = 0x0;
+
+/* Initialize the subtree pointers */
+static gint ett_tte = -1;
+static gint ett_tte_macdest = -1;
+
+
+/* Code to actually dissect the packets */
+static int
+dissect_tte(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
+{
+    int is_frame_pcf;
+    ethertype_data_t ethertype_data;
+
+    /* Set up structures needed to add the protocol subtree and manage it */
+    proto_item *tte_root_item, *tte_macdest_item;
+    proto_tree *tte_tree, *tte_macdest_tree;
+
+    /* Check that there's enough data */
+    if (tvb_reported_length(tvb) < TTE_HEADER_LENGTH)
+        return 0;
+
+    /* check if data of pcf frame */
+    is_frame_pcf =
+       (tvb_get_ntohs(tvb, TTE_MAC_LENGTH * 2) == ETHERTYPE_TTE_PCF);
+
+    /* return if no valid constant field is found */
+    if (!is_frame_pcf)
+    {
+        if ( (tvb_get_ntohl(tvb, 0) & tte_pref_ct_mask) != tte_pref_ct_marker)
+            return 0;
+    }
+
+    /* Make entries in Protocol column and Info column on summary display */
+    col_set_str(pinfo->cinfo, COL_PROTOCOL, "TTE/");
+
+    if (tvb_get_ntohs(tvb, TTE_MAC_LENGTH * 2) <= IEEE_802_3_MAX_LEN)
+    {
+        col_set_str(pinfo->cinfo, COL_INFO, "TTEthernet Frame");
+    }
+    else
+    {
+        col_set_str(pinfo->cinfo, COL_INFO, "Bogus TTEthernet Frame");
+    }
+
+    if (tree) {
+
+        /* create display subtree for the protocol */
+        tte_root_item = proto_tree_add_item(tree, proto_tte, tvb, 0,
+            TTE_HEADER_LENGTH, ENC_NA);
+
+        tte_tree = proto_item_add_subtree(tte_root_item, ett_tte);
+
+        tte_macdest_item = proto_tree_add_item(tte_tree,
+            hf_eth_dst, tvb, 0, TTE_MAC_LENGTH, ENC_NA);
+
+        proto_tree_add_item(tte_tree,
+            hf_eth_src, tvb, TTE_MAC_LENGTH, TTE_MAC_LENGTH, ENC_NA);
+
+        proto_tree_add_item(tte_tree,
+            hf_eth_type, tvb, TTE_MAC_LENGTH*2, TTE_ETHERTYPE_LENGTH,
+            ENC_BIG_ENDIAN);
+
+        tte_macdest_tree = proto_item_add_subtree(tte_macdest_item,
+            ett_tte_macdest);
+
+        proto_tree_add_item(tte_macdest_tree,
+            hf_tte_dst_cf, tvb, 0, TTE_MACDEST_CF_LENGTH, ENC_BIG_ENDIAN);
+
+        proto_tree_add_item(tte_macdest_tree,
+            hf_tte_ctid, tvb, TTE_MACDEST_CF_LENGTH,
+            TTE_MACDEST_CTID_LENGTH, ENC_BIG_ENDIAN);
+    }
+
+    /* prevent clearing the Columns...appending cannot be prevented */
+    col_set_fence(pinfo->cinfo, COL_PROTOCOL);
+
+    /* call std Ethernet dissector */
+    ethertype_data.etype = tvb_get_ntohs(tvb, TTE_MAC_LENGTH * 2);
+    ethertype_data.payload_offset = TTE_HEADER_LENGTH;
+    ethertype_data.fh_tree = NULL;
+    ethertype_data.trailer_id = 0;
+    ethertype_data.fcs_len = 0;
+
+    call_dissector_with_data(ethertype_handle, tvb, pinfo, tree, &ethertype_data);
+    return tvb_reported_length(tvb);
+}
+
+
+void
+proto_register_tte(void)
+{
+    module_t *tte_module;
+
+    static hf_register_info hf[] = {
+        { &hf_tte_dst_cf,
+          { "Constant Field",   "tte.cf",
+            FT_UINT32, BASE_HEX, NULL, 0x0,
+            NULL, HFILL }
+        },
+        { &hf_tte_ctid,
+          { "Critical Traffic Identifier", "tte.ctid",
+            FT_UINT16, BASE_HEX, NULL, 0x0,
+            NULL, HFILL }
+        }
+    };
+
+    /* Setup protocol subtree array */
+    static gint *ett[] = {
+        &ett_tte,
+        &ett_tte_macdest
+    };
+
+    /* Register the protocol name and description */
+    proto_tte = proto_register_protocol("TTEthernet", "TTE", "tte");
+
+    /* Required function calls to register header fields and subtrees used */
+    proto_register_field_array(proto_tte, hf, array_length(hf));
+    proto_register_subtree_array(ett, array_length(ett));
+
+    /* Register preferences module */
+    tte_module = prefs_register_protocol(proto_tte, NULL);
+
+    /* Register preferences */
+    prefs_register_uint_preference(tte_module, "ct_mask_value",
+        "CT Mask (in hex)",
+        "Critical Traffic Mask (base hex)",
+        16, &tte_pref_ct_mask);
+
+    prefs_register_uint_preference(tte_module, "ct_marker_value",
+        "CT Marker (in hex)",
+        "Critical Traffic Marker (base hex)",
+        16, &tte_pref_ct_marker);
+}
+
+
+void
+proto_reg_handoff_tte(void)
+{
+    heur_dissector_add("eth", dissect_tte, "TTEthernet", "tte_eth", proto_tte, HEURISTIC_ENABLE);
+
+    hf_eth_dst  = proto_registrar_get_id_byname ("eth.dst");
+    hf_eth_src  = proto_registrar_get_id_byname ("eth.src");
+    hf_eth_type = proto_registrar_get_id_byname ("eth.type");
+
+    ethertype_handle = find_dissector_add_dependency("ethertype", proto_tte);
+}
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * vi: set shiftwidth=4 tabstop=8 expandtab:
+ * :indentSize=4:tabSize=8:noTabs=true:
+ */