diff options
Diffstat (limited to 'epan/dissectors/packet-m2pa.c')
| -rw-r--r-- | epan/dissectors/packet-m2pa.c | 465 |
1 files changed, 465 insertions, 0 deletions
diff --git a/epan/dissectors/packet-m2pa.c b/epan/dissectors/packet-m2pa.c new file mode 100644 index 0000000000..db548e3e86 --- /dev/null +++ b/epan/dissectors/packet-m2pa.c @@ -0,0 +1,465 @@ +/* packet-m2pa.c + * Routines for MTP2 Peer Adaptation Layer dissection + * It is hopefully (needs testing) compliant to + * http://www.ietf.org/internet-drafts/draft-ietf-sigtran-m2pa-02.txt + * http://www.ietf.org/internet-drafts/draft-ietf-sigtran-m2pa-11.txt + * + * Copyright 2001, 2002, Jeff Morriss <jeff.morriss[AT]ulticom.com>, + * updated by Michael Tuexen <tuexen [AT] fh-muenster.de> + * + * $Id$ + * + * Ethereal - Network traffic analyzer + * By Gerald Combs <gerald@ethereal.com> + * Copyright 1998 Gerald Combs + * + * Copied from packet-m3ua.c + * + * 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 <epan/packet.h> +#include "prefs.h" +#include "sctpppids.h" + +#define NETWORK_BYTE_ORDER FALSE +#define SCTP_PORT_M2PA 3565 + +static int global_sctp_port = SCTP_PORT_M2PA; +static int sctp_port = 0; + +void proto_reg_handoff_m2pa(void); + +static int proto_m2pa = -1; +static module_t *m2pa_module; + +static int hf_version = -1; +static int hf_spare = -1; +static int hf_v2_type = -1; +static int hf_v8_type = -1; +static int hf_class = -1; +static int hf_length = -1; +static int hf_unused = -1; +static int hf_bsn = -1; +static int hf_fsn = -1; +static int hf_v2_status = -1; +static int hf_v8_status = -1; +static int hf_v2_li_spare = -1; +static int hf_v8_li_spare = -1; +static int hf_v2_li_prio = -1; +static int hf_v8_li_prio = -1; +static int hf_filler = -1; +static int hf_unknown_data = -1; + +static gint ett_m2pa = -1; +static gint ett_m2pa_li = -1; + +static int mtp3_proto_id; +static dissector_handle_t mtp3_handle; + +typedef enum { + M2PA_V2 = 1, + M2PA_V11 = 2 +} Version_Type; + +static Version_Type m2pa_version = M2PA_V11; + +#define VERSION_LENGTH 1 +#define SPARE_LENGTH 1 +#define CLASS_LENGTH 1 +#define V2_TYPE_LENGTH 2 +#define V8_TYPE_LENGTH 1 +#define LENGTH_LENGTH 4 +#define UNUSED_LENGTH 1 +#define BSN_LENGTH 3 +#define FSN_LENGTH 3 + +#define V2_HEADER_LENGTH (VERSION_LENGTH + SPARE_LENGTH + \ + V2_TYPE_LENGTH + LENGTH_LENGTH) + +#define V8_HEADER_LENGTH (VERSION_LENGTH + SPARE_LENGTH + \ + CLASS_LENGTH + V8_TYPE_LENGTH + LENGTH_LENGTH + \ + UNUSED_LENGTH + BSN_LENGTH + UNUSED_LENGTH + \ + FSN_LENGTH) + +#define HEADER_OFFSET 0 +#define VERSION_OFFSET HEADER_OFFSET +#define SPARE_OFFSET (VERSION_OFFSET + VERSION_LENGTH) +#define CLASS_OFFSET (SPARE_OFFSET + SPARE_LENGTH) +#define V2_TYPE_OFFSET (SPARE_OFFSET + SPARE_LENGTH) +#define V8_TYPE_OFFSET (CLASS_OFFSET + CLASS_LENGTH) +#define V8_LENGTH_OFFSET (V8_TYPE_OFFSET + V8_TYPE_LENGTH) +#define V2_LENGTH_OFFSET (V2_TYPE_OFFSET + V2_TYPE_LENGTH) +#define FIRST_UNUSED_OFFSET (V8_LENGTH_OFFSET + LENGTH_LENGTH) +#define BSN_OFFSET (FIRST_UNUSED_OFFSET + UNUSED_LENGTH) +#define SECOND_UNUSED_OFFSET (BSN_OFFSET + BSN_LENGTH) +#define FSN_OFFSET (SECOND_UNUSED_OFFSET + UNUSED_LENGTH) + +static const value_string protocol_version_values[] = { + { 1, "Release 1" }, + { 0, NULL } }; + +static const value_string message_class_values[] = { + { 0xb, "M2PA" }, + { 0, NULL } }; + +#define V2_USER_DATA_TYPE 0x0601 +#define V2_LINK_STATUS_TYPE 0x0602 + +static const value_string v2_message_type_values[] = { + { V2_USER_DATA_TYPE, "User Data" }, + { V2_LINK_STATUS_TYPE, "Link Status" }, + { 0, NULL } }; + +#define V8_USER_DATA_TYPE 0x0001 +#define V8_LINK_STATUS_TYPE 0x0002 + +static const value_string v8_message_type_values[] = { + { V8_USER_DATA_TYPE, "User Data" }, + { V8_LINK_STATUS_TYPE, "Link Status" }, + { 0, NULL } }; + +static void +dissect_v2_header(tvbuff_t *header_tvb, packet_info *pinfo, proto_tree *m2pa_tree) +{ + guint16 message_type; + + message_type = tvb_get_ntohs(header_tvb, V2_TYPE_OFFSET); + + if (check_col(pinfo->cinfo, COL_INFO)) + col_add_fstr(pinfo->cinfo, COL_INFO, "%s ", val_to_str(message_type, v2_message_type_values, "reserved")); + + if (m2pa_tree) { + proto_tree_add_item(m2pa_tree, hf_version, header_tvb, VERSION_OFFSET, VERSION_LENGTH, NETWORK_BYTE_ORDER); + proto_tree_add_item(m2pa_tree, hf_spare, header_tvb, SPARE_OFFSET, SPARE_LENGTH, NETWORK_BYTE_ORDER); + proto_tree_add_item(m2pa_tree, hf_v2_type, header_tvb, V2_TYPE_OFFSET, V2_TYPE_LENGTH, NETWORK_BYTE_ORDER); + proto_tree_add_item(m2pa_tree, hf_length, header_tvb, V2_LENGTH_OFFSET, LENGTH_LENGTH, NETWORK_BYTE_ORDER); + } +} + +static void +dissect_v8_header(tvbuff_t *header_tvb, packet_info *pinfo, proto_tree *m2pa_tree) +{ + guint8 message_type; + + message_type = tvb_get_guint8(header_tvb, V8_TYPE_OFFSET); + + if (check_col(pinfo->cinfo, COL_INFO)) + col_add_fstr(pinfo->cinfo, COL_INFO, "%s ", val_to_str(message_type, v8_message_type_values, "Unknown")); + + if (m2pa_tree) { + proto_tree_add_item(m2pa_tree, hf_version, header_tvb, VERSION_OFFSET, VERSION_LENGTH, NETWORK_BYTE_ORDER); + proto_tree_add_item(m2pa_tree, hf_spare, header_tvb, SPARE_OFFSET, SPARE_LENGTH, NETWORK_BYTE_ORDER); + proto_tree_add_item(m2pa_tree, hf_class, header_tvb, CLASS_OFFSET, CLASS_LENGTH, NETWORK_BYTE_ORDER); + proto_tree_add_item(m2pa_tree, hf_v8_type, header_tvb, V8_TYPE_OFFSET, V8_TYPE_LENGTH, NETWORK_BYTE_ORDER); + proto_tree_add_item(m2pa_tree, hf_length, header_tvb, V8_LENGTH_OFFSET, LENGTH_LENGTH, NETWORK_BYTE_ORDER); + proto_tree_add_item(m2pa_tree, hf_unused, header_tvb, FIRST_UNUSED_OFFSET, UNUSED_LENGTH, NETWORK_BYTE_ORDER); + proto_tree_add_item(m2pa_tree, hf_bsn, header_tvb, BSN_OFFSET, BSN_LENGTH, NETWORK_BYTE_ORDER); + proto_tree_add_item(m2pa_tree, hf_unused, header_tvb, SECOND_UNUSED_OFFSET, UNUSED_LENGTH, NETWORK_BYTE_ORDER); + proto_tree_add_item(m2pa_tree, hf_fsn, header_tvb, FSN_OFFSET, FSN_LENGTH, NETWORK_BYTE_ORDER); + } +} + +#define LI_OFFSET 0 +#define LI_LENGTH 1 +#define MTP3_OFFSET (LI_OFFSET + LI_LENGTH) + +#define V2_LI_SPARE_MASK 0xfc +#define V2_LI_PRIORITY_MASK 0x3 + +static void +dissect_v2_user_data_message(tvbuff_t *message_data_tvb, packet_info *pinfo, proto_item *m2pa_item, proto_tree *m2pa_tree, proto_tree *tree) +{ + proto_item *m2pa_li_item; + proto_tree *m2pa_li_tree; + tvbuff_t *payload_tvb; + + if (tvb_length(message_data_tvb) > 0) { + if (m2pa_tree) { + m2pa_li_item = proto_tree_add_text(m2pa_tree, message_data_tvb, LI_OFFSET, LI_LENGTH, "Length Indicator"); + m2pa_li_tree = proto_item_add_subtree(m2pa_li_item, ett_m2pa_li); + + proto_tree_add_item(m2pa_li_tree, hf_v2_li_spare, message_data_tvb, LI_OFFSET, LI_LENGTH, NETWORK_BYTE_ORDER); + proto_tree_add_item(m2pa_li_tree, hf_v2_li_prio, message_data_tvb, LI_OFFSET, LI_LENGTH, NETWORK_BYTE_ORDER); + + /* Re-adjust length of M2PA item since it will be dissected as MTP3 */ + proto_item_set_len(m2pa_item, V2_HEADER_LENGTH + LI_LENGTH); + } + } + + payload_tvb = tvb_new_subset(message_data_tvb, MTP3_OFFSET, -1, -1); + call_dissector(mtp3_handle, payload_tvb, pinfo, tree); +} + +#define V8_LI_SPARE_MASK 0x3f +#define V8_LI_PRIORITY_MASK 0xc0 + +static void +dissect_v8_user_data_message(tvbuff_t *message_data_tvb, packet_info *pinfo, proto_item *m2pa_item, proto_tree *m2pa_tree, proto_tree *tree) +{ + proto_item *m2pa_li_item; + proto_tree *m2pa_li_tree; + tvbuff_t *payload_tvb; + + if (tvb_length(message_data_tvb) > 0) { + if (m2pa_tree) { + m2pa_li_item = proto_tree_add_text(m2pa_tree, message_data_tvb, LI_OFFSET, LI_LENGTH, "Length Indicator"); + m2pa_li_tree = proto_item_add_subtree(m2pa_li_item, ett_m2pa_li); + proto_tree_add_item(m2pa_li_tree, hf_v8_li_prio, message_data_tvb, LI_OFFSET, LI_LENGTH, NETWORK_BYTE_ORDER); + proto_tree_add_item(m2pa_li_tree, hf_v8_li_spare, message_data_tvb, LI_OFFSET, LI_LENGTH, NETWORK_BYTE_ORDER); + + /* Re-adjust length of M2PA item since it will be dissected as MTP3 */ + proto_item_set_len(m2pa_item, V8_HEADER_LENGTH + LI_LENGTH); + } + + payload_tvb = tvb_new_subset(message_data_tvb, MTP3_OFFSET, -1, -1); + call_dissector(mtp3_handle, payload_tvb, pinfo, tree); + } +} + +static const value_string v2_link_status_values[] = { + { 1, "In Service" }, + { 2, "Processor Outage" }, + { 3, "Processor Outage Ended" }, + { 4, "Busy" }, + { 5, "Busy Ended" }, + { 0, NULL } }; + +#define STATUS_LENGTH 4 +#define STATUS_OFFSET 0 +#define FILLER_OFFSET (STATUS_OFFSET + STATUS_LENGTH) + +static void +dissect_v2_link_status_message(tvbuff_t *message_data_tvb, packet_info *pinfo, proto_tree *m2pa_tree) +{ + if (check_col(pinfo->cinfo, COL_INFO)) + col_append_fstr(pinfo->cinfo, COL_INFO, "(%s) ", val_to_str(tvb_get_ntohl(message_data_tvb, STATUS_OFFSET), v2_link_status_values, "Unknown")); + if (m2pa_tree) + proto_tree_add_item(m2pa_tree, hf_v2_status, message_data_tvb, STATUS_OFFSET, STATUS_LENGTH, NETWORK_BYTE_ORDER); +} + +static const value_string v8_link_status_values[] = { + { 1, "Alignment" }, + { 2, "Proving Normal" }, + { 3, "Proving Emergency" }, + { 4, "Ready" }, + { 5, "Processor Outage" }, + { 6, "Processor Outage Ended" }, + { 7, "Busy" }, + { 8, "Busy Ended" }, + { 9, "Out of Service" }, + { 0, NULL } }; + +static void +dissect_v8_link_status_message(tvbuff_t *message_data_tvb, packet_info *pinfo, proto_tree *m2pa_tree) +{ + guint16 filler_length; + + if (check_col(pinfo->cinfo, COL_INFO)) + col_append_fstr(pinfo->cinfo, COL_INFO, "(%s) ", val_to_str(tvb_get_ntohl(message_data_tvb, STATUS_OFFSET), v8_link_status_values, "Unknown")); + + filler_length = tvb_length(message_data_tvb) - STATUS_LENGTH; + + proto_tree_add_item(m2pa_tree, hf_v8_status, message_data_tvb, STATUS_OFFSET, STATUS_LENGTH, NETWORK_BYTE_ORDER); + if (filler_length > 0) + proto_tree_add_item(m2pa_tree, hf_filler, message_data_tvb, FILLER_OFFSET, filler_length, NETWORK_BYTE_ORDER); +} + +static void +dissect_unknown_message(tvbuff_t *message_data_tvb, proto_tree *m2pa_tree) +{ + guint length; + + length = tvb_length(message_data_tvb); + if ((m2pa_tree) && (length > 0)) + proto_tree_add_item(m2pa_tree, hf_unknown_data, message_data_tvb, 0, length, NETWORK_BYTE_ORDER); +} + +#define V2_MESSAGE_DATA_OFFSET (HEADER_OFFSET + V2_HEADER_LENGTH) + +static void +dissect_v2_message_data(tvbuff_t *message_tvb, packet_info *pinfo, proto_item *m2pa_item, proto_tree *m2pa_tree, proto_tree *tree) +{ + guint32 message_data_length; + guint16 type; + tvbuff_t *message_data_tvb; + + message_data_length = tvb_get_ntohl(message_tvb, V2_LENGTH_OFFSET); + message_data_tvb = tvb_new_subset(message_tvb, V2_MESSAGE_DATA_OFFSET, message_data_length, message_data_length); + type = tvb_get_ntohs(message_tvb, V2_TYPE_OFFSET); + + switch(type) { + case V2_USER_DATA_TYPE: + dissect_v2_user_data_message(message_data_tvb, pinfo, m2pa_item, m2pa_tree, tree); + break; + case V2_LINK_STATUS_TYPE: + dissect_v2_link_status_message(message_data_tvb, pinfo, m2pa_tree); + break; + default: + dissect_unknown_message(message_data_tvb, m2pa_tree); + } +} + +#define V8_MESSAGE_DATA_OFFSET (HEADER_OFFSET + V8_HEADER_LENGTH) + +static void +dissect_v8_message_data(tvbuff_t *message_tvb, packet_info *pinfo, proto_item *m2pa_item, proto_tree *m2pa_tree, proto_tree *tree) +{ + guint32 message_data_length; + guint8 type; + tvbuff_t *message_data_tvb; + + message_data_length = tvb_get_ntohl(message_tvb, V8_LENGTH_OFFSET) - V8_HEADER_LENGTH; + message_data_tvb = tvb_new_subset(message_tvb, V8_MESSAGE_DATA_OFFSET, message_data_length, message_data_length); + type = tvb_get_guint8(message_tvb, V8_TYPE_OFFSET); + + + switch(type) { + case V8_USER_DATA_TYPE: + dissect_v8_user_data_message(message_data_tvb, pinfo, m2pa_item, m2pa_tree, tree); + break; + case V8_LINK_STATUS_TYPE: + dissect_v8_link_status_message(message_data_tvb, pinfo, m2pa_tree); + break; + default: + dissect_unknown_message(message_data_tvb, m2pa_tree); + } +} + +static void +dissect_v2_message(tvbuff_t *message_tvb, packet_info *pinfo, proto_item *m2pa_item, proto_tree *m2pa_tree, proto_tree *tree) +{ + dissect_v2_header(message_tvb, pinfo, m2pa_tree); + dissect_v2_message_data(message_tvb, pinfo, m2pa_item, m2pa_tree, tree); +} + +static void +dissect_v8_message(tvbuff_t *message_tvb, packet_info *pinfo, proto_item *m2pa_item, proto_tree *m2pa_tree, proto_tree *tree) +{ + dissect_v8_header(message_tvb, pinfo, m2pa_tree); + dissect_v8_message_data(message_tvb, pinfo, m2pa_item, m2pa_tree, tree); +} + +static void +dissect_m2pa(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) +{ + proto_item *m2pa_item; + proto_tree *m2pa_tree; + + if (check_col(pinfo->cinfo, COL_PROTOCOL)) + switch(m2pa_version) { + case M2PA_V2: + col_set_str(pinfo->cinfo, COL_PROTOCOL, "M2PA (ID 02)"); + break; + case M2PA_V11: + col_set_str(pinfo->cinfo, COL_PROTOCOL, "M2PA (ID 11)"); + break; + }; + + if (tree) { + m2pa_item = proto_tree_add_item(tree, proto_m2pa, tvb, 0, -1, FALSE); + m2pa_tree = proto_item_add_subtree(m2pa_item, ett_m2pa); + } else { + m2pa_item = NULL; + m2pa_tree = NULL; + } + + switch(m2pa_version) { + case M2PA_V2: + dissect_v2_message(tvb, pinfo, m2pa_item, m2pa_tree, tree); + break; + case M2PA_V11: + dissect_v8_message(tvb, pinfo, m2pa_item, m2pa_tree, tree); + break; + }; +} + +void +proto_register_m2pa(void) +{ + static hf_register_info hf[] = + { { &hf_version, { "Version", "m2pa.version", FT_UINT8, BASE_DEC, VALS(protocol_version_values), 0x0, "", HFILL} }, + { &hf_spare, { "Spare", "m2pa.spare", FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL} }, + { &hf_v2_type, { "Message Type", "m2pa.type", FT_UINT16, BASE_HEX, VALS(v2_message_type_values), 0x0, "", HFILL} }, + { &hf_v8_type, { "Message Type", "m2pa.type", FT_UINT8, BASE_DEC, VALS(v8_message_type_values), 0x0, "", HFILL} }, + { &hf_class, { "Message Class", "m2pa.class", FT_UINT8, BASE_DEC, VALS(message_class_values), 0x0, "", HFILL} }, + { &hf_length, { "Message length", "m2pa.length", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL} }, + { &hf_unused, { "Unused", "m2pa.unused", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL} }, + { &hf_bsn, { "BSN", "m2pa.bsn", FT_UINT24, BASE_DEC, NULL, 0x0, "", HFILL} }, + { &hf_fsn, { "FSN", "m2pa.fsn", FT_UINT24, BASE_DEC, NULL, 0x0, "", HFILL} }, + { &hf_v2_li_spare, { "Spare", "m2pa.li_spare", FT_UINT8, BASE_DEC, NULL, V2_LI_SPARE_MASK, "", HFILL} }, + { &hf_v8_li_spare, { "Spare", "m2pa.li_spare", FT_UINT8, BASE_HEX, NULL, V8_LI_SPARE_MASK, "", HFILL} }, + { &hf_v2_li_prio, { "Priority", "m2pa.li_priority", FT_UINT8, BASE_DEC, NULL, V2_LI_PRIORITY_MASK, "", HFILL} }, + { &hf_v8_li_prio, { "Priority", "m2pa.li_priority", FT_UINT8, BASE_HEX, NULL, V8_LI_PRIORITY_MASK, "", HFILL} }, + { &hf_v2_status, { "Link Status", "m2pa.status", FT_UINT32, BASE_DEC, VALS(v2_link_status_values), 0x0, "", HFILL} }, + { &hf_v8_status, { "Link Status", "m2pa.status", FT_UINT32, BASE_DEC, VALS(v8_link_status_values), 0x0, "", HFILL} }, + { &hf_filler, { "Filler", "m2pa.filler", FT_BYTES, BASE_NONE, NULL, 0x0, "", HFILL} }, + { &hf_unknown_data, { "Unknown Data", "m2pa.unknown_data", FT_BYTES, BASE_NONE, NULL, 0x0, "", HFILL} } + }; + + static gint *ett[] = { + &ett_m2pa, + &ett_m2pa_li + }; + + static enum_val_t m2pa_version_options[] = { + { "draft-2", "Internet Draft version 2", M2PA_V2 }, + { "draft-11", "Internet Draft version 11", M2PA_V11 }, + { NULL, NULL, 0 } + }; + + proto_m2pa = proto_register_protocol("MTP2 Peer Adaptation Layer", "M2PA", "m2pa"); + + proto_register_field_array(proto_m2pa, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); + + m2pa_module = prefs_register_protocol(proto_m2pa, proto_reg_handoff_m2pa); + + prefs_register_enum_preference(m2pa_module, "version", "M2PA version", "Version used by Ethereal", (gint *)&m2pa_version, m2pa_version_options, FALSE); + prefs_register_uint_preference(m2pa_module, "port", "M2PA SCTP Port", "Set the port for M2PA messages (Default of 3565)", 10, &global_sctp_port); +} + +void +proto_reg_handoff_m2pa(void) +{ + static int prefs_initialized = FALSE; + static dissector_handle_t m2pa_handle; + + /* Port preferences code shamelessly copied from packet-beep.c */ + if (!prefs_initialized) { + mtp3_handle = find_dissector("mtp3"); + mtp3_proto_id = proto_get_id_by_filter_name("mtp3"); + m2pa_handle = create_dissector_handle(dissect_m2pa, proto_m2pa); + + dissector_add("sctp.ppi", M2PA_PAYLOAD_PROTOCOL_ID, m2pa_handle); + + prefs_initialized = TRUE; + + } else { + + dissector_delete("sctp.port", sctp_port, m2pa_handle); + + } + + /* Set our port number for future use */ + sctp_port = global_sctp_port; + + dissector_add("sctp.port", sctp_port, m2pa_handle); +} |