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Diffstat (limited to 'epan/dissectors/packet-llt.c')
| -rw-r--r-- | epan/dissectors/packet-llt.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/epan/dissectors/packet-llt.c b/epan/dissectors/packet-llt.c new file mode 100644 index 00000000..7dcf0a4a --- /dev/null +++ b/epan/dissectors/packet-llt.c @@ -0,0 +1,183 @@ +/* packet-llt.c + * Routines for Veritas Low Latency Transport (LLT) dissection + * Copyright 2006, Stephen Fisher (see AUTHORS file) + * + * 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> + +void proto_register_llt(void); +void proto_reg_handoff_llt(void); + +static dissector_handle_t llt_handle; + +static const value_string message_type_vs[] = { + { 0x0a, "heartbeat" }, + { 0, NULL} +}; + +/* Variables for our preferences */ +static guint preference_alternate_ethertype = 0x0; + +/* Initialize the protocol and registered fields */ +static int proto_llt = -1; + +static int hf_llt_cluster_num = -1; +static int hf_llt_node_id = -1; +static int hf_llt_message_type = -1; +static int hf_llt_sequence_num = -1; +static int hf_llt_message_time = -1; +static int hf_llt_dst_node_id = -1; +static int hf_llt_src_node_id = -1; + +/* Initialize the subtree pointers */ +static gint ett_llt = -1; + +/* Code to actually dissect the packets */ +static int +dissect_llt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) +{ + /* Set up structures needed to add the protocol subtree and manage it */ + proto_item *ti; + proto_tree *llt_tree; + guint8 message_type; + guint16 magic; + + /* Make entries in Protocol column and Info column on summary display */ + col_set_str(pinfo->cinfo, COL_PROTOCOL, "LLT"); + + magic = tvb_get_guint16(tvb, 0, ENC_BIG_ENDIAN); + if(magic == 0x0602){ /* v2 ? */ + + ti = proto_tree_add_item(tree, proto_llt, tvb, 0, -1, ENC_NA); + llt_tree = proto_item_add_subtree(ti, ett_llt); + + proto_tree_add_item(llt_tree, hf_llt_cluster_num, tvb, 2, 2, ENC_LITTLE_ENDIAN); + proto_tree_add_item(llt_tree, hf_llt_dst_node_id, tvb, 6, 1, ENC_LITTLE_ENDIAN); + proto_tree_add_item(llt_tree, hf_llt_src_node_id, tvb, 8, 1, ENC_LITTLE_ENDIAN); + + } else { + message_type = tvb_get_guint8(tvb, 3); + + col_add_fstr(pinfo->cinfo, COL_INFO, "Message type: %s", val_to_str(message_type, message_type_vs, "Unknown (0x%02x)")); + + ti = proto_tree_add_item(tree, proto_llt, tvb, 0, -1, ENC_NA); + llt_tree = proto_item_add_subtree(ti, ett_llt); + + proto_tree_add_item(llt_tree, hf_llt_cluster_num, tvb, 2, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(llt_tree, hf_llt_message_type, tvb, 3, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(llt_tree, hf_llt_node_id, tvb, 7, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(llt_tree, hf_llt_sequence_num, tvb, 24, 4, ENC_BIG_ENDIAN); + proto_tree_add_item(llt_tree, hf_llt_message_time, tvb, 40, 4, ENC_BIG_ENDIAN); + } + return tvb_captured_length(tvb); +} + +/* Register the protocol with Wireshark */ +void +proto_register_llt(void) +{ + module_t *llt_module; + + static hf_register_info hf[] = { + + { &hf_llt_cluster_num, { "Cluster number", "llt.cluster_num", + FT_UINT16, BASE_DEC, NULL, 0, + "Cluster number that this node belongs to", HFILL } }, + + { &hf_llt_message_type, { "Message type", "llt.message_type", + FT_UINT8, BASE_HEX, VALS(message_type_vs), 0, + "Type of LLT message contained in this frame", HFILL } }, + + { &hf_llt_node_id, { "Node ID", "llt.node_id", + FT_UINT8, BASE_DEC, NULL, 0, + "Number identifying this node within the cluster", HFILL } }, + + { &hf_llt_sequence_num, { "Sequence number", "llt.sequence_num", + FT_UINT32, BASE_DEC, NULL, 0, + "Sequence number of this frame", HFILL } }, + + { &hf_llt_message_time, { "Message time", "llt.message_time", + FT_UINT32, BASE_DEC, NULL, 0, + "Number of ticks since this node was last rebooted", HFILL } }, + + { &hf_llt_dst_node_id, { "Destination Node ID", "llt.dst.node_id", + FT_UINT8, BASE_DEC, NULL, 0, + "Number identifying destination node within the cluster", HFILL } }, + + { &hf_llt_src_node_id, { "Source Node ID", "llt.src.node_id", + FT_UINT8, BASE_DEC, NULL, 0, + "Number identifying source node within the cluster", HFILL } }, + + }; + + /* Setup protocol subtree array */ + static gint *ett[] = { + &ett_llt, + }; + + /* Register the protocol name and description */ + proto_llt = proto_register_protocol("Veritas Low Latency Transport (LLT)", "LLT", "llt"); + + /* Required function calls to register the header fields and subtrees used */ + proto_register_field_array(proto_llt, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); + + /* Register preferences module */ + llt_module = prefs_register_protocol(proto_llt, proto_reg_handoff_llt); + + /* Register our preferences */ + prefs_register_uint_preference(llt_module, "alternate_ethertype", "Alternate ethertype value (in hex)", + "Dissect this ethertype as LLT traffic in addition to the default, 0xCAFE.", + 16, &preference_alternate_ethertype); /* A base-16 (hexadecimal) value */ + + /* Register our dissector */ + llt_handle = register_dissector("llt", dissect_llt, proto_llt); +} + + +void +proto_reg_handoff_llt(void) +{ + static gboolean initialized = FALSE; + static guint preference_alternate_ethertype_last; + + if (!initialized) { + dissector_add_uint("ethertype", ETHERTYPE_LLT, llt_handle); + initialized = TRUE; + } else { + if (preference_alternate_ethertype_last != 0x0) { + dissector_delete_uint("ethertype", preference_alternate_ethertype_last, llt_handle); + } + } + + /* Save the setting to see if it has changed later */ + preference_alternate_ethertype_last = preference_alternate_ethertype; + + if (preference_alternate_ethertype != 0x0) { + /* Register the new ethertype setting */ + dissector_add_uint("ethertype", preference_alternate_ethertype, llt_handle); + } +} + +/* + * Editor modelines - https://www.wireshark.org/tools/modelines.html + * + * Local variables: + * c-basic-offset: 8 + * tab-width: 8 + * indent-tabs-mode: t + * End: + * + * vi: set shiftwidth=8 tabstop=8 noexpandtab: + * :indentSize=8:tabSize=8:noTabs=false: + */ |