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wireshark/epan/dissectors/asn1/nbap/packet-nbap-template.c

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/* packet-nbap-template.c
* Routines for UMTS Node B Application Part(NBAP) packet dissection
* Copyright 2005, 2009 Anders Broman <anders.broman@ericsson.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* Ref: 3GPP TS 25.433 version 6.6.0 Release 6
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/sctpppids.h>
#include <epan/asn1.h>
#include <epan/conversation.h>
#include <epan/expert.h>
#include <epan/prefs.h>
#include <epan/proto_data.h>
#include <epan/uat.h>
#include "packet-per.h"
#include "packet-isup.h"
#include "packet-umts_fp.h"
#include "packet-umts_mac.h"
#include "packet-rrc.h"
#include "packet-umts_rlc.h"
#include "packet-nbap.h"
#ifdef _MSC_VER
/* disable: "warning C4146: unary minus operator applied to unsigned type, result still unsigned" */
#pragma warning(disable:4146)
#endif
#define PNAME "UTRAN Iub interface NBAP signalling"
#define PSNAME "NBAP"
#define PFNAME "nbap"
#define NBAP_IGNORE_PORT 255
/* Debug */
#define DEBUG_NBAP 0
#if DEBUG_NBAP
#include <epan/to_str.h>
#define nbap_debug(...) ws_warning(__VA_ARGS__)
#else
#define nbap_debug(...)
#endif
void proto_register_nbap(void);
void proto_reg_handoff_nbap(void);
/* Protocol Handles */
static dissector_handle_t fp_handle;
#include "packet-nbap-val.h"
/* Initialize the protocol and registered fields */
static int proto_nbap = -1;
static int hf_nbap_transportLayerAddress_ipv4 = -1;
static int hf_nbap_transportLayerAddress_ipv6 = -1;
static int hf_nbap_transportLayerAddress_nsap = -1;
static int hf_nbap_reassembled_information_block = -1;
#include "packet-nbap-hf.c"
/* Initialize the subtree pointers */
static int ett_nbap = -1;
static int ett_nbap_TransportLayerAddress = -1;
static int ett_nbap_TransportLayerAddress_nsap = -1;
static int ett_nbap_ib_sg_data = -1;
#include "packet-nbap-ett.c"
static expert_field ei_nbap_no_find_port_info = EI_INIT;
static expert_field ei_nbap_no_set_comm_context_id = EI_INIT;
static expert_field ei_nbap_hsdsch_entity_not_specified = EI_INIT;
extern int proto_fp;
static dissector_handle_t nbap_handle;
/*
* Structure to hold Setup Request/Response message conversation
* we add all src add/port declared in SetupRequest msg
* to match it with dst add/port declared in SetupResponse msg
* so we gonna have conversation with exact match (src and dst addr and port)
*/
typedef struct nbap_setup_conv
{
guint32 transaction_id;
guint32 dd_mode;
guint32 channel_id;
guint32 request_frame_number;
address addr;
guint32 port;
umts_fp_conversation_info_t *umts_fp_conversation_info;
conversation_t *conv;
}nbap_setup_conv_t;
/*
* Hash table to manage Setup Request/Response message conversation
* we can look in table for proper conversation
*/
static wmem_map_t *nbap_setup_conv_table;
typedef struct
{
gint num_dch_in_flow;
gint next_dch;
gint num_ul_chans;
gint ul_chan_tf_size[MAX_FP_CHANS];
gint ul_chan_num_tbs[MAX_FP_CHANS];
gint num_dl_chans;
gint dl_chan_tf_size[MAX_FP_CHANS];
gint dl_chan_num_tbs[MAX_FP_CHANS];
}nbap_dch_channel_info_t;
/* Struct to collect E-DCH data in a packet
* As the address data comes before the ddi entries
* we save the address to be able to find the conversation and update the
* conversation data.
*/
typedef struct
{
address crnc_address;
guint16 crnc_port;
gint no_ddi_entries;
guint8 edch_ddi[MAX_EDCH_DDIS];
guint edch_macd_pdu_size[MAX_EDCH_DDIS];
guint8 edch_type; /* 1 means T2 */
guint8 lchId[MAX_EDCH_DDIS]; /*Logical channel ids.*/
} nbap_edch_channel_info_t;
typedef struct
{
guint32 crnc_address;
guint16 crnc_port[maxNrOfEDCHMACdFlows];
} nbap_edch_port_info_t;
typedef struct
{
address crnc_address;
guint16 crnc_port;
enum fp_rlc_mode rlc_mode;
guint32 hsdsch_physical_layer_category;
guint8 entity; /* "ns" means type 1 and "ehs" means type 2, type 3 == ?*/
} nbap_hsdsch_channel_info_t;
typedef struct
{
address crnc_address;
guint16 crnc_port;
enum fp_rlc_mode rlc_mode;
} nbap_common_channel_info_t;
/*Stuff for mapping NodeB-Comuncation Context ID to CRNC Communication Context ID*/
typedef struct com_ctxt_{
/*guint nodeb_context;*/
guint crnc_context;
guint frame_num;
}nbap_com_context_id_t;
enum TransportFormatSet_type_enum
{
NBAP_DCH_UL,
NBAP_DCH_DL,
NBAP_CPCH,
NBAP_FACH,
NBAP_PCH
};
#define NBAP_MAX_IB_SEGMENT_LENGTH 222
typedef struct nbap_ib_segment_t {
guint32 bit_length;
guint8* data;
} nbap_ib_segment_t;
static nbap_ib_segment_t* nbap_parse_ib_sg_data_var1(packet_info *pinfo, tvbuff_t *tvb,gboolean is_short)
{
guint8 bit_length;
guint8* data;
nbap_ib_segment_t* output;
if ( tvb_captured_length(tvb) < 2 ) {
return NULL;
}
if (is_short) {
bit_length = tvb_get_guint8(tvb,0) + 1;
data = (guint8*)tvb_memdup(pinfo->pool,tvb,1,(bit_length+7)/8);
}
else {
bit_length = NBAP_MAX_IB_SEGMENT_LENGTH;
data = (guint8*)tvb_memdup(pinfo->pool,tvb,0,(bit_length+7)/8);
}
output = wmem_new(pinfo->pool, nbap_ib_segment_t);
output->bit_length = bit_length;
output->data = data;
return output;
}
/*****************************************************************************/
/* Packet private data */
/* For this dissector, all information passed between different ASN.1 nodes */
/* should be done only through this API! */
/*****************************************************************************/
typedef struct nbap_private_data_t
{
guint32 transportLayerAddress_ipv4;
guint16 binding_id_port;
enum TransportFormatSet_type_enum transport_format_set_type;
guint32 procedure_code;
guint num_items;
guint32 ul_scrambling_code;
guint32 com_context_id;
gint num_dch_in_flow;
gint hrnti;
guint32 protocol_ie_id;
guint32 dd_mode;
guint32 transaction_id;
guint32 t_dch_id;
guint32 dch_id;
guint32 prev_dch_id;
guint32 common_physical_channel_id;
guint32 e_dch_macdflow_id;
guint32 hsdsch_macdflow_id;
gboolean max_mac_d_pdu_size_ext_ie_present;
guint32 e_dch_ddi_value;
guint32 logical_channel_id;
guint32 common_macdflow_id;
guint32 mac_d_pdu_size;
guint32 common_transport_channel_id;
gint paging_indications;
guint32 ib_type;
guint32 segment_type;
gboolean crnc_context_present; /* Whether 'com_context_id' is set */
guint8 dch_crc_present;
/* Arrays */
nbap_dch_channel_info_t nbap_dch_chnl_info[256];
nbap_edch_channel_info_t nbap_edch_channel_info[maxNrOfEDCHMACdFlows];
gint hsdsch_macdflow_ids[maxNrOfMACdFlows];
nbap_hsdsch_channel_info_t nbap_hsdsch_channel_info[maxNrOfMACdFlows];
nbap_common_channel_info_t nbap_common_channel_info[maxNrOfMACdFlows]; /*TODO: Fix this!*/
wmem_list_t* ib_segments; /* Information block segments */
} nbap_private_data_t;
/* Helper function to get or create a private_data struct */
static nbap_private_data_t* nbap_get_private_data(packet_info *pinfo)
{
guint8 i;
/* NOTE: Unlike other ASN.1 dissectors which store information in
* actx->private_data the NBAP dissector can't do so because some fields
* are defined as their own 'PDU' (Like BindingID and TransportLayerAddress)
* in those cases, the generic ASN.1 dissector creates a NEW 'ASN.1 context'
* (asn1_ctx_t) and hence a new 'private data' field for them so information
* can't be passes to/from them.
*/
nbap_private_data_t *private_data = (nbap_private_data_t *)p_get_proto_data(pinfo->pool, pinfo, proto_nbap, 0);
if(private_data == NULL ) {
private_data = wmem_new0(pinfo->pool, nbap_private_data_t);
p_add_proto_data(pinfo->pool, pinfo, proto_nbap, 0, private_data);
/* Setting default values */
private_data->hsdsch_macdflow_id = 3;
private_data->crnc_context_present = FALSE;
private_data->procedure_code = 0xFFFF;
private_data->dd_mode = 0xFFFF;
private_data->dch_crc_present = 2; /* Unknown */
for (i = 0; i < maxNrOfMACdFlows; i++) {
private_data->nbap_hsdsch_channel_info[i].entity = hs;
}
}
return private_data;
}
/* Helper function to reset the private data struct*/
static void nbap_reset_private_data(packet_info *pinfo)
{
p_remove_proto_data(pinfo->pool, pinfo, proto_nbap, 0);
}
/*****************************************************************************/
/* Global Variables */
/* Variables for sub elements dissection */
static const gchar *ProcedureID;
/* Trees */
static wmem_tree_t* edch_flow_port_map = NULL;
wmem_tree_t *nbap_scrambling_code_crncc_map = NULL;
wmem_tree_t *nbap_crncc_urnti_map = NULL;
static wmem_tree_t* com_context_map;
/* This table is used externally from FP, MAC and such, TODO: merge this with
* lch_contents[] */
guint8 lchId_type_table[]= {
MAC_CONTENT_UNKNOWN, /* Shouldn't happen*/
MAC_CONTENT_DCCH, /* 1 to 4 SRB => DCCH*/
MAC_CONTENT_DCCH,
MAC_CONTENT_DCCH,
MAC_CONTENT_DCCH,
MAC_CONTENT_CS_DTCH, /* 5 to 7 Conv CS speech => ?*/
MAC_CONTENT_CS_DTCH,
MAC_CONTENT_CS_DTCH,
MAC_CONTENT_DCCH, /* 8 SRB => DCCH*/
MAC_CONTENT_PS_DTCH, /* 9 maps to DTCH*/
MAC_CONTENT_UNKNOWN, /* 10 Conv CS unknown*/
MAC_CONTENT_PS_DTCH, /* 11 Interactive PS => DTCH*/
MAC_CONTENT_PS_DTCH, /* 12 Streaming PS => DTCH*/
MAC_CONTENT_CS_DTCH, /* 13 Streaming CS*/
MAC_CONTENT_PS_DTCH, /* 14 Interactive PS => DTCH*/
MAC_CONTENT_CCCH /* This is CCCH? */
};
/* Mapping logicalchannel id to RLC_MODE */
guint8 lchId_rlc_map[] = {
0,
RLC_UM, /* Logical channel id = 1 is SRB1 which uses RLC_UM*/
RLC_AM,
RLC_AM,
RLC_AM,
RLC_TM, /*5 to 7 Conv CS Speech*/
RLC_TM,
RLC_TM, /*...*/
RLC_AM,
RLC_AM,
RLC_AM,
RLC_AM,
RLC_AM,
RLC_AM,
RLC_AM,
RLC_AM, /* This is CCCH which is UM?, probably not */
};
/* Preference variables */
/* Array with preference variables for easy looping, TODO: merge this with
* lchId_type_table[] */
static int lch_contents[16] = {
MAC_CONTENT_DCCH,
MAC_CONTENT_DCCH,
MAC_CONTENT_DCCH,
MAC_CONTENT_DCCH,
MAC_CONTENT_CS_DTCH,
MAC_CONTENT_CS_DTCH,
MAC_CONTENT_CS_DTCH,
MAC_CONTENT_DCCH,
MAC_CONTENT_PS_DTCH,
MAC_CONTENT_UNKNOWN,
MAC_CONTENT_PS_DTCH,
MAC_CONTENT_PS_DTCH,
MAC_CONTENT_CS_DTCH,
MAC_CONTENT_PS_DTCH,
MAC_CONTENT_CCCH,
MAC_CONTENT_DCCH
};
static const enum_val_t content_types[] = {
{"MAC_CONTENT_UNKNOWN", "MAC_CONTENT_UNKNOWN", MAC_CONTENT_UNKNOWN},
{"MAC_CONTENT_DCCH", "MAC_CONTENT_DCCH", MAC_CONTENT_DCCH},
{"MAC_CONTENT_PS_DTCH", "MAC_CONTENT_PS_DTCH", MAC_CONTENT_PS_DTCH},
{"MAC_CONTENT_CS_DTCH", "MAC_CONTENT_CS_DTCH", MAC_CONTENT_CS_DTCH},
{"MAC_CONTENT_CCCH", "MAC_CONTENT_CCCH", MAC_CONTENT_CCCH},
{NULL, NULL, -1}};
typedef struct {
const char *name;
const char *title;
const char *description;
} preference_strings;
/* This is used when registering preferences, name, title, description */
static const preference_strings ch_strings[] = {
{"lch1_content", "Logical Channel 1 Content", "foo"},
{"lch2_content", "Logical Channel 2 Content", "foo"},
{"lch3_content", "Logical Channel 3 Content", "foo"},
{"lch4_content", "Logical Channel 4 Content", "foo"},
{"lch5_content", "Logical Channel 5 Content", "foo"},
{"lch6_content", "Logical Channel 6 Content", "foo"},
{"lch7_content", "Logical Channel 7 Content", "foo"},
{"lch8_content", "Logical Channel 8 Content", "foo"},
{"lch9_content", "Logical Channel 9 Content", "foo"},
{"lch10_content", "Logical Channel 10 Content", "foo"},
{"lch11_content", "Logical Channel 11 Content", "foo"},
{"lch12_content", "Logical Channel 12 Content", "foo"},
{"lch13_content", "Logical Channel 13 Content", "foo"},
{"lch14_content", "Logical Channel 14 Content", "foo"},
{"lch15_content", "Logical Channel 15 Content", "foo"},
{"lch16_content", "Logical Channel 16 Content", "foo"}};
enum ib_sg_enc_type {
IB_SG_DATA_ENC_VAR_1,
IB_SG_DATA_ENC_VAR_2
};
static const enum_val_t ib_sg_enc_vals[] = {
{"Encoding Variant 1 (TS 25.433 Annex D.2)",
"Encoding Variant 1 (TS 25.433 Annex D.2)", IB_SG_DATA_ENC_VAR_1},
{"Encoding Variant 2 (TS 25.433 Annex D.3)",
"Encoding Variant 2 (TS 25.433 Annex D.3)", IB_SG_DATA_ENC_VAR_2},
{NULL, NULL, -1}
};
static gint preferences_ib_sg_data_encoding = IB_SG_DATA_ENC_VAR_1;
/* Dissector tables */
static dissector_table_t nbap_ies_dissector_table;
static dissector_table_t nbap_extension_dissector_table;
static dissector_table_t nbap_proc_imsg_dissector_table;
static dissector_table_t nbap_proc_sout_dissector_table;
static dissector_table_t nbap_proc_uout_dissector_table;
static int dissect_ProtocolIEFieldValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *);
static int dissect_ProtocolExtensionFieldExtensionValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *);
static int dissect_InitiatingMessageValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *);
static int dissect_SuccessfulOutcomeValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *);
static int dissect_UnsuccessfulOutcomeValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *);
static guint32 calculate_setup_conv_key(const guint32 transaction_id, const guint32 dd_mode, const guint32 channel_id);
static void add_setup_conv(const packet_info *pinfo _U_, const guint32 transaction_id, const guint32 dd_mode, const guint32 channel_id, const guint32 req_frame_number,
const address *addr, const guint32 port, umts_fp_conversation_info_t * umts_fp_conversation_info, conversation_t *conv);
static nbap_setup_conv_t* find_setup_conv(const packet_info *pinfo _U_, const guint32 transaction_id, const guint32 dd_mode, const guint32 channel_id);
static void delete_setup_conv(nbap_setup_conv_t *conv);
/*Easy way to add hsdhsch binds for corner cases*/
static void add_hsdsch_bind(packet_info * pinfo);
#include "packet-nbap-fn.c"
static int dissect_ProtocolIEFieldValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
guint32 protocol_ie_id;
protocol_ie_id = nbap_get_private_data(pinfo)->protocol_ie_id;
return (dissector_try_uint_new(nbap_ies_dissector_table, protocol_ie_id, tvb, pinfo, tree, FALSE, NULL)) ? tvb_captured_length(tvb) : 0;
}
static int dissect_ProtocolExtensionFieldExtensionValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
guint32 protocol_ie_id;
protocol_ie_id = nbap_get_private_data(pinfo)->protocol_ie_id;
return (dissector_try_uint_new(nbap_extension_dissector_table, protocol_ie_id, tvb, pinfo, tree, FALSE, NULL)) ? tvb_captured_length(tvb) : 0;
}
static int dissect_InitiatingMessageValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
if (!ProcedureID) return 0;
return (dissector_try_string(nbap_proc_imsg_dissector_table, ProcedureID, tvb, pinfo, tree, NULL)) ? tvb_captured_length(tvb) : 0;
}
static int dissect_SuccessfulOutcomeValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
if (!ProcedureID) return 0;
return (dissector_try_string(nbap_proc_sout_dissector_table, ProcedureID, tvb, pinfo, tree, NULL)) ? tvb_captured_length(tvb) : 0;
}
static int dissect_UnsuccessfulOutcomeValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
if (!ProcedureID) return 0;
return (dissector_try_string(nbap_proc_uout_dissector_table, ProcedureID, tvb, pinfo, tree, NULL)) ? tvb_captured_length(tvb) : 0;
}
static void add_hsdsch_bind(packet_info *pinfo){
address null_addr;
conversation_t *conversation = NULL;
umts_fp_conversation_info_t *umts_fp_conversation_info;
fp_hsdsch_channel_info_t* fp_hsdsch_channel_info = NULL;
guint32 i;
nbap_hsdsch_channel_info_t* nbap_hsdsch_channel_info;
if (PINFO_FD_VISITED(pinfo)){
return;
}
nbap_hsdsch_channel_info = nbap_get_private_data(pinfo)->nbap_hsdsch_channel_info;
/* Set port to zero use that as an indication of whether we have data or not */
clear_address(&null_addr);
for (i = 0; i < maxNrOfMACdFlows; i++) {
if (nbap_hsdsch_channel_info[i].crnc_port != 0){
conversation = find_conversation(pinfo->num, &(nbap_hsdsch_channel_info[i].crnc_address), &null_addr, CONVERSATION_UDP,
nbap_hsdsch_channel_info[i].crnc_port, 0, NO_ADDR_B);
if (conversation == NULL) {
/* It's not part of any conversation - create a new one. */
conversation = conversation_new(pinfo->num, &(nbap_hsdsch_channel_info[i].crnc_address), &null_addr, CONVERSATION_UDP,
nbap_hsdsch_channel_info[i].crnc_port, 0, NO_ADDR2|NO_PORT2);
/* Set dissector */
conversation_set_dissector(conversation, fp_handle);
if(pinfo->link_dir==P2P_DIR_DL){
umts_fp_conversation_info = wmem_new0(wmem_file_scope(), umts_fp_conversation_info_t);
/* Fill in the HSDSCH relevant data */
umts_fp_conversation_info->iface_type = IuB_Interface;
umts_fp_conversation_info->division = Division_FDD;
umts_fp_conversation_info->channel = CHANNEL_HSDSCH;
umts_fp_conversation_info->dl_frame_number = 0;
umts_fp_conversation_info->ul_frame_number = pinfo->num;
copy_address_wmem(wmem_file_scope(), &(umts_fp_conversation_info->crnc_address), &nbap_hsdsch_channel_info[i].crnc_address);
umts_fp_conversation_info->crnc_port = nbap_hsdsch_channel_info[i].crnc_port;
fp_hsdsch_channel_info = wmem_new0(wmem_file_scope(), fp_hsdsch_channel_info_t);
umts_fp_conversation_info->channel_specific_info = (void*)fp_hsdsch_channel_info;
/*Added june 3, normally just the iterator variable*/
fp_hsdsch_channel_info->hsdsch_macdflow_id = i ; /*hsdsch_macdflow_ids[i];*/ /* hsdsch_macdflow_id;*/
/* Cheat and use the DCH entries */
umts_fp_conversation_info->num_dch_in_flow++;
umts_fp_conversation_info->dch_ids_in_flow_list[umts_fp_conversation_info->num_dch_in_flow -1] = i;
if(nbap_hsdsch_channel_info[i].entity == entity_not_specified ){
/*Error*/
expert_add_info(pinfo, NULL, &ei_nbap_hsdsch_entity_not_specified);
}else{
fp_hsdsch_channel_info->hsdsch_entity = (enum fp_hsdsch_entity)nbap_hsdsch_channel_info[i].entity;
}
umts_fp_conversation_info->rlc_mode = nbap_hsdsch_channel_info[i].rlc_mode;
set_umts_fp_conv_data(conversation, umts_fp_conversation_info);
}
}
}
}
}
/*
* Function used to manage conversation declared in Setup Request/Response message
*/
static guint32 calculate_setup_conv_key(const guint32 transaction_id, const guint32 dd_mode, const guint32 channel_id)
{
/* We need to pack 3 values on 32 bits:
* 31-16 transaction_id
* 15-14 dd_mode
* 13-0 channel_id
*/
guint32 key;
key = transaction_id << 16;
key |= (dd_mode & 0x03) << 14;
key |= (channel_id & 0x3fff);
nbap_debug("\tCalculating key 0x%04x", key);
return key;
}
static void add_setup_conv(const packet_info *pinfo _U_, const guint32 transaction_id, const guint32 dd_mode, const guint32 channel_id, const guint32 req_frame_number,
const address *addr, const guint32 port, umts_fp_conversation_info_t * umts_fp_conversation_info, conversation_t *conv)
{
nbap_setup_conv_t *new_conv = NULL;
guint32 key;
nbap_debug("Creating new setup conv\t TransactionID: %u\tddMode: %u\tChannelID: %u\t %s:%u",
transaction_id, dd_mode, channel_id, address_to_str(pinfo->pool, addr), port);
new_conv = wmem_new0(wmem_file_scope(), nbap_setup_conv_t);
/* fill with data */
new_conv->transaction_id = transaction_id;
new_conv->dd_mode = dd_mode;
new_conv->channel_id = channel_id;
new_conv->request_frame_number = req_frame_number;
copy_address_wmem(wmem_file_scope(), &new_conv->addr, addr);
new_conv->port = port;
new_conv->umts_fp_conversation_info = umts_fp_conversation_info;
new_conv->conv = conv;
key = calculate_setup_conv_key(new_conv->transaction_id, new_conv->dd_mode, new_conv->channel_id);
wmem_map_insert(nbap_setup_conv_table, GUINT_TO_POINTER(key), new_conv);
}
static nbap_setup_conv_t* find_setup_conv(const packet_info *pinfo _U_, const guint32 transaction_id, const guint32 dd_mode, const guint32 channel_id)
{
nbap_setup_conv_t *conv;
guint32 key;
nbap_debug("Looking for Setup Conversation match\t TransactionID: %u\t ddMode: %u\t ChannelID: %u", transaction_id, dd_mode, channel_id);
key = calculate_setup_conv_key(transaction_id, dd_mode, channel_id);
conv = (nbap_setup_conv_t*) wmem_map_lookup(nbap_setup_conv_table, GUINT_TO_POINTER(key));
if(conv == NULL){
nbap_debug("\tDidn't find Setup Conversation match");
}else{
nbap_debug("\tFOUND Setup Conversation match\t TransactionID: %u\t ddMode: %u\t ChannelID: %u\t %s:%u",
conv->transaction_id, conv->dd_mode, conv->channel_id, address_to_str(pinfo->pool, &(conv->addr)), conv->port);
}
return conv;
}
static void delete_setup_conv(nbap_setup_conv_t *conv)
{
guint32 key;
/* check if conversation exist */
if(conv == NULL){
nbap_debug("Trying delete Setup Conversation that does not exist (ptr == NULL)\t");
return;
}
key = calculate_setup_conv_key(conv->transaction_id, conv->dd_mode, conv->channel_id);
wmem_map_remove(nbap_setup_conv_table, GUINT_TO_POINTER(key));
}
static void nbap_init(void){
guint8 i;
/*Initialize*/
com_context_map = wmem_tree_new_autoreset(wmem_epan_scope(), wmem_file_scope());
/*Initialize structure for muxed flow indication*/
edch_flow_port_map = wmem_tree_new_autoreset(wmem_epan_scope(), wmem_file_scope());
/*Initialize Setup Conversation hash table*/
nbap_setup_conv_table = wmem_map_new(wmem_file_scope(), g_direct_hash, g_direct_equal);
/*Initializing Scrambling Code to C-RNC Context & C-RNC Context to U-RNTI maps*/
nbap_scrambling_code_crncc_map = wmem_tree_new_autoreset(wmem_epan_scope(), wmem_file_scope());
nbap_crncc_urnti_map = wmem_tree_new_autoreset(wmem_epan_scope(), wmem_file_scope());
for (i = 0; i < 15; i++) {
lchId_type_table[i+1] = lch_contents[i];
}
}
static int
dissect_nbap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
proto_item *nbap_item = NULL;
proto_tree *nbap_tree = NULL;
/* make entry in the Protocol column on summary display */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "NBAP");
/* create the nbap protocol tree */
nbap_item = proto_tree_add_item(tree, proto_nbap, tvb, 0, -1, ENC_NA);
nbap_tree = proto_item_add_subtree(nbap_item, ett_nbap);
/* Clearing any old 'private data' stored */
nbap_reset_private_data(pinfo);
return dissect_NBAP_PDU_PDU(tvb, pinfo, nbap_tree, data);
}
/* Highest ProcedureCode value, used in heuristics */
#define NBAP_MAX_PC 56 /* id-secondaryULFrequencyUpdate = 56*/
#define NBAP_MSG_MIN_LENGTH 7
static gboolean
dissect_nbap_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
guint8 pdu_type;
guint8 procedure_id;
guint8 dd_mode;
guint8 criticality;
guint8 transaction_id_type;
guint length;
int length_field_offset;
#define PDU_TYPE_OFFSET 0
#define PROC_CODE_OFFSET 1
#define DD_CRIT_OFFSET 2
if (tvb_captured_length(tvb) < NBAP_MSG_MIN_LENGTH) {
return FALSE;
}
pdu_type = tvb_get_guint8(tvb, PDU_TYPE_OFFSET);
if (pdu_type & 0x1f) {
/* pdu_type is not 0x00 (initiatingMessage), 0x20 (succesfulOutcome),
0x40 (unsuccesfulOutcome) or 0x60 (outcome), ignore extension bit (0x80) */
return FALSE;
}
procedure_id = tvb_get_guint8(tvb, PROC_CODE_OFFSET);
if (procedure_id > NBAP_MAX_PC) {
return FALSE;
}
dd_mode = tvb_get_guint8(tvb, DD_CRIT_OFFSET) >> 5;
if (dd_mode >= 0x03) {
/* dd_mode is not 0x00 (tdd), 0x01 (fdd) or 0x02 (common) */
return FALSE;
}
criticality = (tvb_get_guint8(tvb, DD_CRIT_OFFSET) & 0x18) >> 3;
if (criticality == 0x03) {
/* criticality is not 0x00 (reject), 0x01 (ignore) or 0x02 (notify) */
return FALSE;
}
/* Finding the offset for the length field - depends on wether the transaction id is long or short */
transaction_id_type = (tvb_get_guint8(tvb, DD_CRIT_OFFSET) & 0x02) >> 1;
if(transaction_id_type == 0x00) { /* Short transaction id - 1 byte*/
length_field_offset = 4;
}
else { /* Long transaction id - 2 bytes*/
length_field_offset = 5;
}
/* compute aligned PER length determinant without calling dissect_per_length_determinant()
to avoid exceptions and info added to tree, info column and expert info */
length = tvb_get_guint8(tvb, length_field_offset);
length_field_offset += 1;
if (length & 0x80) {
if ((length & 0xc0) == 0x80) {
length &= 0x3f;
length <<= 8;
length += tvb_get_guint8(tvb, length_field_offset);
length_field_offset += 1;
} else {
length = 0;
}
}
if (length!= (tvb_reported_length(tvb) - length_field_offset)){
return FALSE;
}
dissect_nbap(tvb, pinfo, tree, data);
return TRUE;
}
/*--- proto_register_nbap -------------------------------------------*/
void proto_register_nbap(void)
{
module_t *nbap_module;
guint8 i;
/* List of fields */
static hf_register_info hf[] = {
{ &hf_nbap_transportLayerAddress_ipv4,
{ "transportLayerAddress IPv4", "nbap.transportLayerAddress_ipv4",
FT_IPv4, BASE_NONE, NULL, 0,
NULL, HFILL }},
{ &hf_nbap_transportLayerAddress_ipv6,
{ "transportLayerAddress IPv6", "nbap.transportLayerAddress_ipv6",
FT_IPv6, BASE_NONE, NULL, 0,
NULL, HFILL }},
{ &hf_nbap_transportLayerAddress_nsap,
{ "transportLayerAddress NSAP", "nbap.transportLayerAddress_NSAP",
FT_BYTES, BASE_NONE, NULL, 0,
NULL, HFILL }},
{ &hf_nbap_reassembled_information_block,
{ "Reassembled Information Block", "nbap.reassembled_information_block",
FT_BYTES, BASE_NONE, NULL, 0,
NULL, HFILL }},
#include "packet-nbap-hfarr.c"
};
/* List of subtrees */
static gint *ett[] = {
&ett_nbap,
&ett_nbap_TransportLayerAddress,
&ett_nbap_TransportLayerAddress_nsap,
&ett_nbap_ib_sg_data,
#include "packet-nbap-ettarr.c"
};
static ei_register_info ei[] = {
{ &ei_nbap_no_set_comm_context_id, { "nbap.no_set_comm_context_id", PI_MALFORMED, PI_WARN, "Couldn't not set Communication Context-ID, fragments over reconfigured channels might fail", EXPFILL }},
{ &ei_nbap_no_find_port_info, { "nbap.no_find_port_info", PI_MALFORMED, PI_WARN, "Couldn't not find port information for reconfigured E-DCH flow, unable to reconfigure", EXPFILL }},
{ &ei_nbap_hsdsch_entity_not_specified, { "nbap.hsdsch_entity_not_specified", PI_MALFORMED,PI_ERROR, "HSDSCH Entity not specified!", EXPFILL }},
};
expert_module_t* expert_nbap;
/* Register protocol */
proto_nbap = proto_register_protocol(PNAME, PSNAME, PFNAME);
/* Register fields and subtrees */
proto_register_field_array(proto_nbap, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_nbap = expert_register_protocol(proto_nbap);
expert_register_field_array(expert_nbap, ei, array_length(ei));
/* Register dissector */
nbap_handle = register_dissector("nbap", dissect_nbap, proto_nbap);
nbap_module = prefs_register_protocol(proto_nbap, NULL);
/* Register preferences for mapping logical channel IDs to MAC content types. */
for (i = 0; i < 16; i++) {
prefs_register_enum_preference(nbap_module, ch_strings[i].name, ch_strings[i].title, ch_strings[i].description, &lch_contents[i], content_types, FALSE);
}
prefs_register_enum_preference(nbap_module, "ib_sg_data_encoding",
"IB_SG_DATA encoding",
"Encoding used for the IB-SG-DATA element carrying segments of information blocks",
&preferences_ib_sg_data_encoding, ib_sg_enc_vals, FALSE);
/* Register dissector tables */
nbap_ies_dissector_table = register_dissector_table("nbap.ies", "NBAP-PROTOCOL-IES", proto_nbap, FT_UINT32, BASE_DEC);
nbap_extension_dissector_table = register_dissector_table("nbap.extension", "NBAP-PROTOCOL-EXTENSION", proto_nbap, FT_UINT32, BASE_DEC);
nbap_proc_imsg_dissector_table = register_dissector_table("nbap.proc.imsg", "NBAP-ELEMENTARY-PROCEDURE InitiatingMessage", proto_nbap, FT_STRING, BASE_NONE);
nbap_proc_sout_dissector_table = register_dissector_table("nbap.proc.sout", "NBAP-ELEMENTARY-PROCEDURE SuccessfulOutcome", proto_nbap, FT_STRING, BASE_NONE);
nbap_proc_uout_dissector_table = register_dissector_table("nbap.proc.uout", "NBAP-ELEMENTARY-PROCEDURE UnsuccessfulOutcome", proto_nbap, FT_STRING, BASE_NONE);
register_init_routine(nbap_init);
}
/*
* #define EXTRA_PPI 1
*/
/*--- proto_reg_handoff_nbap ---------------------------------------*/
void
proto_reg_handoff_nbap(void)
{
fp_handle = find_dissector("fp");
dissector_add_uint("sctp.ppi", NBAP_PAYLOAD_PROTOCOL_ID, nbap_handle);
#ifdef EXTRA_PPI
dissector_add_uint("sctp.ppi", 17, nbap_handle);
#endif
dissector_add_for_decode_as("sctp.port", nbap_handle);
heur_dissector_add("sctp", dissect_nbap_heur, "NBAP over SCTP", "nbap_sctp", proto_nbap, HEURISTIC_ENABLE);
#include "packet-nbap-dis-tab.c"
}
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