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/* packet-li5g.c
* Routines for ETSI TS 103 221-2 V1.6.1 (2022-06), Internal Network Interface X2/X3 for Lawful Interception
* Roy Zhang <roy.zhang@nokia-sbell.com>
*
* 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/ipproto.h>
#include <epan/unit_strings.h>
#include "packet-tls.h"
void proto_reg_handoff_li5g(void);
void proto_register_li5g(void);
static int proto_li5g;
static int hf_li5g_version;
static int hf_li5g_pduType;
static int hf_li5g_headerLen;
static int hf_li5g_payloadLen;
static int hf_li5g_payloadFormat;
static int hf_li5g_payloadDirection;
static int hf_li5g_xid;
static int hf_li5g_cid;
static int hf_li5g_attrType;
static int hf_li5g_attrLen;
static int hf_li5g_pld;
/* the min Attribute Type is 1 */
#define LI_5G_ATTR_TYPE_MAX 23
/* the min header length */
#define LI_5G_HEADER_LEN_MIN 40
static int ett_li5g;
static int ett_attrContents[LI_5G_ATTR_TYPE_MAX];
static int hf_li5g_attrContents[LI_5G_ATTR_TYPE_MAX];
static dissector_handle_t li5g_handle;
static dissector_table_t li5g_subdissector_table;
static const value_string pdu_type_vals[] = {
{1, "X2 xIRI"},
{2, "X3 xCC"},
{3, "Keepalive"},
{4, "Keepalive Acknowledgement"},
{0, NULL}
};
static const value_string payload_format_vals[] = {
{ 0, "Reserved for Keepalive"},
{ 1, "ETSI TS 102 232-1 Defined Payload"},
{ 2, "3GPP TS 33.128 Defined Payload"},
{ 3, "3GPP TS 33.108 Defined Payload"},
{ 4, "Proprietary Payload"},
{ 5, "IPv4 Packet"},
{ 6, "IPv6 Packet"},
{ 7, "Ethernet Frame"},
{ 8, "RTP Packet"},
{ 9, "SIP Message"},
{10, "DHCP Message"},
{11, "RADIUS Packet"},
{12, "GTP-U Message"},
{13, "MSRP Message"},
{14, "3GPP TS 33.108 EpsIRIContent"},
{15, "MIME Message"},
{16, "3GPP Unstructured PDU"},
{ 0, NULL}
};
static const value_string payload_dir_vals[] = {
{0, "Reserved for Keepalive"},
{1, "The direction of the intercepted data or event is not known to the POI"},
{2, "The intercepted data or event was sent to (i.e. received by) the target"},
{3, "The intercepted data or event was sent from the target"},
{4, "The intercepted data or event is a result of intercepted data or events in more than one direction"},
{5, "The concept of direction is not applicable to this intercepted data or event"},
{0, NULL}
};
static const value_string attribute_type_vals[] = {
{ 1, "ETSI TS 102 232-1 Defined Attribute"},
{ 2, "3GPP TS 33.128 Defined Attribute"},
{ 3, "3GPP TS 33.108 Defined Attribute"},
{ 4, "Proprietary Attribute"},
{ 5, "Domain ID (DID)"},
{ 6, "Network Function ID (NFID)"},
{ 7, "Interception Point ID (IPID)"},
{ 8, "Sequence Number"},
{ 9, "Timestamp"},
{10, "Source IPv4 Address"},
{11, "Destination IPv4 Address"},
{12, "Source IPv6 Address"},
{13, "Destination IPv6 Address"},
{14, "Source Port"},
{15, "Destination Port"},
{16, "IP Protocol"},
{17, "Matched Target Identifier"},
{18, "Other Target Identifier"},
{19, "MIME Content Type"},
{20, "MIME Content Transfer Encoding"},
{21, "Additional XID Related Information"},
{22, "SDP Session Description"},
{0, NULL}
};
static int
// NOLINTNEXTLINE(misc-no-recursion)
dissect_li5g(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_tree *li5g_tree, *attr_tree, *parent=NULL;
proto_item *ti, *attr_ti;
tvbuff_t *payload_tvb;
int offset = LI_5G_HEADER_LEN_MIN, hf_attr = -1;
uint32_t headerLen, payloadLen, pduType;
uint16_t payloadFormat, attrType, attrLen;
const char* info;
address src_addr;
address dst_addr;
uint32_t src_port;
uint32_t dst_port;
headerLen = tvb_get_ntohl(tvb, 4);
payloadLen = tvb_get_ntohl(tvb, 8);
payloadFormat = tvb_get_ntohs(tvb, 12);
ti = proto_tree_add_item(tree, proto_li5g, tvb, 0, headerLen+payloadLen, ENC_NA);
li5g_tree = proto_item_add_subtree(ti, ett_li5g);
proto_tree_add_item(li5g_tree, hf_li5g_version, tvb, 0, 2, ENC_BIG_ENDIAN);
proto_tree_add_item_ret_uint(li5g_tree, hf_li5g_pduType, tvb, 2, 2, ENC_BIG_ENDIAN, &pduType);
proto_tree_add_item(li5g_tree, hf_li5g_headerLen, tvb, 4, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(li5g_tree, hf_li5g_payloadLen, tvb, 8, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(li5g_tree, hf_li5g_payloadFormat, tvb, 12, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(li5g_tree, hf_li5g_payloadDirection, tvb, 14, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(li5g_tree, hf_li5g_xid, tvb, 16, 16, ENC_NA);
proto_tree_add_item(li5g_tree, hf_li5g_cid, tvb, 32, 8, ENC_NA);
/* Get the Conditional Attribute */
while(headerLen - offset > 0){
attrType = tvb_get_ntohs(tvb, offset);
attrLen = tvb_get_ntohs(tvb, offset+2);
if (attrType < LI_5G_ATTR_TYPE_MAX){
hf_attr = hf_li5g_attrContents[attrType];
attr_ti = proto_tree_add_item(li5g_tree, hf_attr, tvb, offset+4, attrLen, ENC_NA);
attr_tree = proto_item_add_subtree(attr_ti, ett_attrContents[attrType]);
proto_tree_add_item(attr_tree, hf_li5g_attrType, tvb, offset, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(attr_tree, hf_li5g_attrLen, tvb, offset+2, 2, ENC_BIG_ENDIAN);
if (attrType == 17 || attrType == 18) {
proto_tree_add_item(attr_tree, hf_attr, tvb, offset+4, attrLen, ENC_UTF_8 | ENC_NA);
} else {
proto_tree_add_item(attr_tree, hf_attr, tvb, offset+4, attrLen, ENC_BIG_ENDIAN);
}
}
offset = offset + 4 + attrLen;
}
proto_tree_add_item(li5g_tree, hf_li5g_pld, tvb, headerLen, payloadLen, ENC_NA);
/* the key is address+port+frame_num for reassemble list, the address/port can be changed in pinfo because of the inner TCP protocol */
copy_address_shallow(&src_addr, &pinfo->src);
copy_address_shallow(&dst_addr, &pinfo->dst);
src_port = pinfo->srcport;
dst_port = pinfo->destport;
/* to make all the sub protocol(such as DNS) under li5g*/
if (li5g_tree && li5g_tree->parent){
parent=li5g_tree->parent;
li5g_tree->parent=NULL;
}
payload_tvb = tvb_new_subset_length(tvb, offset, payloadLen);
if (!dissector_try_uint(li5g_subdissector_table, payloadFormat, payload_tvb, pinfo, li5g_tree)) {
call_data_dissector(payload_tvb, pinfo, li5g_tree);
}
if (parent)
li5g_tree->parent=parent;
/* have another li5g in the same packet? */
if (tvb_captured_length(tvb)>offset+payloadLen) {
increment_dissection_depth(pinfo);
dissect_li5g(tvb_new_subset_remaining(tvb, offset+payloadLen), pinfo, tree, NULL);
decrement_dissection_depth(pinfo);
}
/* set these info at the end*/
col_set_str(pinfo->cinfo, COL_PROTOCOL, "LI5G");
col_clear_fence(pinfo->cinfo, COL_INFO);
col_clear(pinfo->cinfo, COL_INFO);
info = try_val_to_str(pduType, pdu_type_vals);
if (info != NULL) {
col_set_str(pinfo->cinfo, COL_INFO, info);
}
/* copy back to the original value when return from innner protocol */
copy_address_shallow(&pinfo->src, &src_addr);
copy_address_shallow(&pinfo->dst, &dst_addr);
pinfo->srcport = src_port;
pinfo->destport = dst_port;
return tvb_captured_length(tvb);
}
static bool
dissect_li5g_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
struct tlsinfo* tlsinfo = (struct tlsinfo*)data;
if (tvb_captured_length(tvb) < LI_5G_HEADER_LEN_MIN)
return false;
/* the version should be 1 */
if (tvb_get_ntohs(tvb, 0) != 1)
return false;
/* only 4 types supported*/
if(tvb_get_ntohs(tvb, 2) < 1 || tvb_get_ntohs(tvb, 2) > 4)
return false;
/* TLS can hold it, no need to find the dissect every time */
*(tlsinfo->app_handle) = li5g_handle;
dissect_li5g(tvb, pinfo, tree, data);
return true;
}
void
proto_register_li5g(void)
{
static hf_register_info hf[] = {
{ &hf_li5g_version, { "Version", "li5g.ver", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_pduType, { "PDU Type", "li5g.type", FT_UINT16, BASE_DEC, VALS(pdu_type_vals), 0x0, NULL, HFILL }},
{ &hf_li5g_headerLen, { "Header Length", "li5g.hl", FT_UINT32, BASE_DEC|BASE_UNIT_STRING, UNS(&units_octet_octets), 0x0, NULL, HFILL }},
{ &hf_li5g_payloadLen, { "Payload Length", "li5g.pl", FT_UINT32, BASE_DEC|BASE_UNIT_STRING, UNS(&units_octet_octets), 0x0, NULL, HFILL }},
{ &hf_li5g_payloadFormat, { "Payload Format", "li5g.pf", FT_UINT16, BASE_DEC, VALS(payload_format_vals), 0x0, NULL, HFILL }},
{ &hf_li5g_payloadDirection, { "Payload Direction", "li5g.pd", FT_UINT16, BASE_DEC, VALS(payload_dir_vals), 0x0, NULL, HFILL }},
{ &hf_li5g_xid, { "XID", "li5g.xid", FT_GUID, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_cid, { "Correlation ID", "li5g.cid", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrType, { "Attribute Type", "li5g.attrType", FT_UINT16, BASE_DEC, VALS(attribute_type_vals), 0x0, NULL, HFILL }},
{ &hf_li5g_attrLen, { "Attribute Length", "li5g.attrLen", FT_UINT16, BASE_DEC|BASE_UNIT_STRING, UNS(&units_octet_octets), 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[1], { "ETSI TS 102 232-1 Defined Attribute", "li5g.102_232_1_attr", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[2], { "3GPP TS 33.128 Defined Attribute", "li5g.33_128_attr", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[3], { "3GPP TS 33.108 Defined Attribute", "li5g.33_108_attr", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[4], { "Proprietary Attribute", "li5g.proprietary_attr", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[5], { "Domain ID", "li5g.did", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[6], { "Network Function ID", "li5g.nfid", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[7], { "Interception Point ID", "li5g.ipid", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[8], { "Sequence Number", "li5g.sq", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[9], { "Timestamp", "li5g.ts", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_UTC, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[10], { "Source IPv4 address", "li5g.srcip", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[11], { "Destination IPv4 address", "li5g.dstip", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[12], { "Source IPv6 address", "li5g.srcipv6", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[13], { "Destination IPv6 address", "li5g.dstipv6", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[14], { "Source Port", "li5g.srcport", FT_UINT16, BASE_PT_TCP, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[15], { "Destination Port", "li5g.dstport", FT_UINT16, BASE_PT_TCP, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[16], { "IP Protocol", "li5g.ipproto", FT_UINT8, BASE_DEC|BASE_EXT_STRING, &ipproto_val_ext, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[17], { "Matched Target Identifier", "li5g.mti", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[18], { "Other Target Identifier", "li5g.oti", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[19], { "MIME Content Type", "li5g.mime_content_type", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[20], { "MIME Content Transfer Encoding", "li5g.mime_transfer_type_encoding", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[21], { "Additional XID Related Information", "li5g.additional_xid", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[22], { "SDP Session Description", "li5g.sdp", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_pld, { "Payload", "li5g.pld", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
};
static int *ett[] = {
&ett_li5g,
&ett_attrContents[1],
&ett_attrContents[2],
&ett_attrContents[3],
&ett_attrContents[4],
&ett_attrContents[5],
&ett_attrContents[6],
&ett_attrContents[7],
&ett_attrContents[8],
&ett_attrContents[9],
&ett_attrContents[10],
&ett_attrContents[11],
&ett_attrContents[12],
&ett_attrContents[13],
&ett_attrContents[14],
&ett_attrContents[15],
&ett_attrContents[16],
&ett_attrContents[17],
&ett_attrContents[18],
&ett_attrContents[19],
&ett_attrContents[20],
&ett_attrContents[21],
&ett_attrContents[22],
};
proto_li5g = proto_register_protocol("Lawful Interception 5G", "LI5G", "li5g");
li5g_handle = register_dissector("li5g", dissect_li5g, proto_li5g);
li5g_subdissector_table = register_dissector_table("li5g.payload", "LI5G Payload Format", proto_li5g, FT_UINT16, BASE_DEC);
proto_register_field_array(proto_li5g, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_li5g(void)
{
dissector_add_uint("li5g.payload", 2, find_dissector_add_dependency("xiri", proto_li5g));
dissector_add_uint("li5g.payload", 5, find_dissector("ip"));
dissector_add_uint("li5g.payload", 6, find_dissector("ipv6"));
dissector_add_uint("li5g.payload", 7, find_dissector("eth_maybefcs"));
dissector_add_uint("li5g.payload", 8, find_dissector("rtp"));
dissector_add_uint("li5g.payload", 9, find_dissector("sip"));
dissector_add_uint("li5g.payload", 10, find_dissector("dhcp"));
dissector_add_uint("li5g.payload", 11, find_dissector("radius"));
dissector_add_uint("li5g.payload", 12, find_dissector("gtp"));
dissector_add_uint("li5g.payload", 13, find_dissector("msrp"));
dissector_add_uint("li5g.payload", 14, find_dissector("HI2Operations"));
dissector_add_uint_range_with_preference("tcp.port", "", li5g_handle);
dissector_add_uint_range_with_preference("udp.port", "", li5g_handle);
heur_dissector_add("tls", dissect_li5g_heur, "5G LI over TLS", "li5g_tls", proto_li5g, HEURISTIC_ENABLE);
}
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