/* packet-sm.c * Routines for Cisco Session Management Protocol dissection * Copyright 2004, Duncan Sargeant * * $Id$ * * Wireshark - Network traffic analyzer * By Gerald Combs * 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. */ /* * This is basically a glue dissector for the Cisco SM protocol. It sits * between the RUDP and MTP3 layers in conversations on port 7000 between * SLTs and MGCs. A link to an overview of the technology : * * http://www.cisco.com/en/US/products/sw/netmgtsw/ps4883/products_installation_and_configuration_guide_chapter09186a008010950a.html * * Link showing debugs of the protocol: * http://www.cisco.com/univercd/cc/td/doc/product/access/sc/rel7/omts/omts_apb.htm#30052 * * I'm unable to get local debugs of this protocol, as the SLT's are * slow cpu cisco 2600's, and they tend to drop the signalling links * if you turn any debugging on! But there's not much interesting * here, its just glue to get the ISUP/MTP3 data nicely. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #define MESSAGE_TYPE_START 0 #define MESSAGE_TYPE_STOP 1 #define MESSAGE_TYPE_ACTIVE 2 #define MESSAGE_TYPE_STANDBY 3 #define MESSAGE_TYPE_Q_HOLD_INVOKE 4 #define MESSAGE_TYPE_Q_HOLD_RESPONSE 5 #define MESSAGE_TYPE_Q_RESUME_INVOKE 6 #define MESSAGE_TYPE_Q_RESUME_RESPONSE 7 #define MESSAGE_TYPE_Q_RESET_INVOKE 8 #define MESSAGE_TYPE_Q_RESET_RESPONSE 9 #define MESSAGE_TYPE_PDU 0x8000 static const value_string sm_message_type_value[] = { { MESSAGE_TYPE_START, "Start Message" }, { MESSAGE_TYPE_STOP, "Stop Message" }, { MESSAGE_TYPE_ACTIVE, "Active Message" }, { MESSAGE_TYPE_STANDBY, "Standby Message" }, { MESSAGE_TYPE_Q_HOLD_INVOKE, "Q_HOLD Invoke Message" }, { MESSAGE_TYPE_Q_HOLD_RESPONSE, "Q_HOLD Response Message" }, { MESSAGE_TYPE_Q_RESUME_INVOKE, "Q_RESUME Invoke Message" }, { MESSAGE_TYPE_Q_RESUME_RESPONSE, "Q_RESUME Response Message" }, { MESSAGE_TYPE_Q_RESET_INVOKE, "Q_RESET Invoke Message" }, { MESSAGE_TYPE_Q_RESET_RESPONSE, "Q_RESET Response Message" }, { MESSAGE_TYPE_PDU, "PDU Message" }, { 0, NULL } }; static const value_string sm_message_type_value_info[] = { { MESSAGE_TYPE_START, "Start" }, { MESSAGE_TYPE_STOP, "Stop" }, { MESSAGE_TYPE_ACTIVE, "Active" }, { MESSAGE_TYPE_STANDBY, "Standby" }, { MESSAGE_TYPE_Q_HOLD_INVOKE, "Q_HOLD Invoke" }, { MESSAGE_TYPE_Q_HOLD_RESPONSE, "Q_HOLD Response" }, { MESSAGE_TYPE_Q_RESUME_INVOKE, "Q_RESUME Invoke" }, { MESSAGE_TYPE_Q_RESUME_RESPONSE, "Q_RESUME Response" }, { MESSAGE_TYPE_Q_RESET_INVOKE, "Q_RESET Invoke" }, { MESSAGE_TYPE_Q_RESET_RESPONSE, "Q_RESET Response" }, { MESSAGE_TYPE_PDU, "PDU" }, { 0, NULL } }; #define PDU_MTP3_TO_SLT 0x10 #define PDU_MTP3_FROM_SLT 0x11 #define PDU_SET_STATE 0x44 #define PDU_RETURN_STATE 0x45 static const value_string sm_pdu_type_value[] = { { PDU_MTP3_TO_SLT, "mtp3 to SLT"}, { PDU_MTP3_FROM_SLT, "mtp3 from SLT"}, { PDU_SET_STATE, "set session state"}, { PDU_RETURN_STATE, "return session state"}, { 0, NULL } }; /* TODO: Change to useful name once known */ #define SM_PROTOCOL_X100 0x0100 #define SM_PROTOCOL_X101 0x0101 #define SM_PROTOCOL_X114 0x0114 #define SM_PROTOCOL_X122 0x0122 /* Initialize the protocol and registered fields */ static int proto_sm = -1; static int hf_sm_sm_msg_type = -1; static int hf_sm_protocol = -1; static int hf_sm_msg_id = -1; static int hf_sm_msg_type = -1; static int hf_sm_channel = -1; static int hf_sm_bearer = -1; static int hf_sm_len = -1; static int hf_sm_ip_addr = -1; static int hf_sm_context = -1; static int hf_sm_eisup_msg_id = -1; static int hf_sm_tag = -1; /* Initialize the subtree pointers */ static gint ett_sm = -1; static dissector_handle_t sdp_handle; static dissector_handle_t mtp3_handle; static dissector_handle_t data_handle; /* Code to actually dissect the packets */ static void dissect_sm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { proto_item *ti; proto_tree *sm_tree; tvbuff_t *next_tvb = NULL; guint32 sm_message_type; guint16 protocol; guint16 msg_type = 0; guint16 length; guint16 tag; int offset = 0; sm_message_type = tvb_get_ntohl(tvb,offset); col_set_str(pinfo->cinfo, COL_PROTOCOL, "SM"); col_add_fstr(pinfo->cinfo, COL_INFO, "Cisco SM Packet (%s)", val_to_str(sm_message_type, sm_message_type_value_info,"reserved")); ti = proto_tree_add_item(tree, proto_sm, tvb, offset, 0, ENC_NA); sm_tree = proto_item_add_subtree(ti, ett_sm); proto_tree_add_uint_format(sm_tree, hf_sm_sm_msg_type, tvb, offset, 4, sm_message_type, "SM Message type: %s (0x%0x)", val_to_str(sm_message_type, sm_message_type_value, "reserved"), sm_message_type); offset = offset + 4; if (sm_message_type == MESSAGE_TYPE_PDU) { proto_tree_add_item(sm_tree, hf_sm_protocol, tvb, offset, 2, ENC_BIG_ENDIAN); protocol = tvb_get_ntohs(tvb,offset); offset = offset + 2; switch(protocol){ case SM_PROTOCOL_X100: case SM_PROTOCOL_X122: if (!tree) return; /* Protocol 0x100/0x122 only contains a length and then an EISUP packet */ proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN); length = tvb_get_ntohs(tvb,offset); offset = offset + 2; proto_item_set_len(ti, 8); /* This should be the EISUP dissector but we havent got one * right now - so decode it as data for now ... */ next_tvb = tvb_new_subset(tvb, offset, length, length); call_dissector(data_handle, next_tvb, pinfo, sm_tree); break; case SM_PROTOCOL_X101: if (!tree) return; /* XXX Reveres enginered so this may not be correct!!! * EISUP - used between Cisco HSI and Cisco PGW devices, * uses RUDP with default port number 8003. * Protocol stack is RUDP->Cisco SM->SDP. * This implementation is PROPRIETARY */ proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN); length = tvb_get_ntohs(tvb,offset); offset = offset + 2; proto_item_set_len(ti, length + offset); /* The next stuff seems to be IP addr */ proto_tree_add_item(sm_tree, hf_sm_ip_addr, tvb, offset, 4, ENC_BIG_ENDIAN); offset = offset + 4; /* This part looks to be the same per session */ proto_tree_add_item(sm_tree, hf_sm_context, tvb, offset, 4, ENC_BIG_ENDIAN); offset = offset +4; /* Some sort of message type? */ proto_tree_add_item(sm_tree, hf_sm_eisup_msg_id, tvb, offset, 1, ENC_BIG_ENDIAN); offset = offset + 1; /* XXX Problem are tags 1 or two bytes???*/ proto_tree_add_item(sm_tree, hf_sm_tag, tvb, offset, 2, ENC_BIG_ENDIAN); tag = tvb_get_ntohs(tvb,offset); offset = offset +2; if (tag== 0x01ac) { proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN); length = tvb_get_ntohs(tvb,offset); offset = offset +2; next_tvb = tvb_new_subset(tvb, offset, length, length); call_dissector(sdp_handle, next_tvb, pinfo, sm_tree); offset = offset+length; } /*return;*/ break; case SM_PROTOCOL_X114: if (!tree) return; /* XXX Reveres enginered so this may not be correct!!! */ proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN); length = tvb_get_ntohs(tvb,offset); offset = offset + 2; proto_item_set_len(ti, length + offset); /* The next stuff seems to be IP addr */ proto_tree_add_item(sm_tree, hf_sm_ip_addr, tvb, offset, 4, ENC_BIG_ENDIAN); offset = offset + 4; proto_tree_add_item(sm_tree, hf_sm_context, tvb, offset, 4, ENC_BIG_ENDIAN); offset = offset +4; /* Some sort of message type? */ proto_tree_add_item(sm_tree, hf_sm_eisup_msg_id, tvb, offset, 1, ENC_BIG_ENDIAN); offset = offset + 1; /* XXX Problem are tags 1 or two bytes???*/ proto_tree_add_item(sm_tree, hf_sm_tag, tvb, offset, 2, ENC_BIG_ENDIAN); tag = tvb_get_ntohs(tvb,offset); offset = offset +2; if (tag== 0x01ac) { proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN); length = tvb_get_ntohs(tvb,offset); offset = offset +2; next_tvb = tvb_new_subset(tvb, offset, length, length); call_dissector(sdp_handle, next_tvb, pinfo, sm_tree); offset = offset+length; } break; default: proto_tree_add_item(sm_tree, hf_sm_msg_id, tvb, offset, 2, ENC_BIG_ENDIAN); offset = offset +2; msg_type = tvb_get_ntohs(tvb,offset); proto_tree_add_uint_format(sm_tree, hf_sm_msg_type, tvb, offset, 2, msg_type, "Message type: %s (0x%0x)", val_to_str(msg_type, sm_pdu_type_value, "reserved"), msg_type); msg_type = tvb_get_ntohs(tvb,offset); offset = offset + 2; proto_tree_add_item(sm_tree, hf_sm_channel, tvb, offset, 2, ENC_BIG_ENDIAN); offset = offset + 2; proto_tree_add_item(sm_tree, hf_sm_bearer, tvb, offset, 2, ENC_BIG_ENDIAN); offset = offset +2; proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN); length = tvb_get_ntohs(tvb,offset); offset = offset +2; proto_item_set_len(ti, 16); if (length > 0) { next_tvb = tvb_new_subset(tvb, offset, length, length); if ((msg_type == PDU_MTP3_TO_SLT || msg_type == PDU_MTP3_FROM_SLT)) { call_dissector(mtp3_handle, next_tvb, pinfo, tree); } else { call_dissector(data_handle, next_tvb, pinfo, tree); } } } } } void proto_register_sm(void) { static hf_register_info hf[] = { { &hf_sm_sm_msg_type, { "SM Message Type", "sm.sm_msg_type", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL } }, { &hf_sm_protocol, { "Protocol Type", "sm.protocol", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL } }, { &hf_sm_msg_id, { "Message ID", "sm.msgid", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL } }, { &hf_sm_msg_type, { "Message Type", "sm.msg_type", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL } }, { &hf_sm_channel, { "Channel ID", "sm.channel", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL } }, { &hf_sm_bearer, { "Bearer ID", "sm.bearer", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL } }, { &hf_sm_len, { "Length", "sm.len", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_sm_ip_addr, { "IPv4 address","sm.ip_addr", FT_IPv4,BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_sm_context, { "Context","sm.context", FT_UINT32, BASE_DEC, NULL, 0x0, "Context(guesswork!)", HFILL } }, { &hf_sm_eisup_msg_id, { "Message id","sm.eisup_message_id", FT_UINT8, BASE_DEC, NULL, 0x0, "Message id(guesswork!)", HFILL } }, { &hf_sm_tag, { "Tag","sm.tag", FT_UINT16, BASE_DEC, NULL, 0x0, "Tag(guesswork!)", HFILL } }, }; /* Setup protocol subtree array */ static gint *ett[] = { &ett_sm, }; /* Register the protocol name and description */ proto_sm = proto_register_protocol("Cisco Session Management", "SM", "sm"); register_dissector("sm", dissect_sm, proto_sm); /* Required function calls to register the header fields and subtrees used */ proto_register_field_array(proto_sm, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); } void proto_reg_handoff_sm(void) { sdp_handle = find_dissector("sdp"); mtp3_handle = find_dissector("mtp3"); data_handle = find_dissector("data"); }