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/* packet-li5g.c
* Routines for ETSI TS 103 221-2 V1.1.1 (2019-03), 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>
void proto_reg_handoff_li5g(void);
void proto_register_li5g(void);
static int proto_li5g = -1;
static int hf_li5g_version = -1;
static int hf_li5g_pduType = -1;
static int hf_li5g_headerLen = -1;
static int hf_li5g_payloadLen = -1;
static int hf_li5g_payloadFormart = -1;
static int hf_li5g_payloadDirection = -1;
static int hf_li5g_xid = -1;
static int hf_li5g_cid = -1;
static int hf_li5g_attrType = -1;
static int hf_li5g_attrLen = -1;
static int hf_li5g_pld = -1;
/* the min Attribute Type is 1 */
#define LI_5G_ATTR_TYPE_MAX 19
/* the min header length */
#define LI_5G_HEADER_LEN_MIN 40
/* 13 payload format */
#define LI_5G_PAYLOAD_FORMAT_MAX 14
static gint ett_li5g = -1;
static gint 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_handle_t subProtocol_handle[LI_5G_PAYLOAD_FORMAT_MAX]={NULL};
static gchar* pdu_info_str[] = {
"",
"x2 xIRI",
"x3 CC",
"Keepalive",
"Keepalive Acknowledgement"
};
static int
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;
int offset = LI_5G_HEADER_LEN_MIN, hf_attr = -1;
guint32 headerLen, payloadLen;
guint16 pduType, payloadFormart, attrType, attrLen;
address src_addr;
address dst_addr;
guint32 src_port;
guint32 dst_port;
pduType = tvb_get_ntohs(tvb, 2);
headerLen = tvb_get_ntohl(tvb, 4);
payloadLen = tvb_get_ntohl(tvb, 8);
payloadFormart = 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(li5g_tree, hf_li5g_pduType, tvb, 2, 2, ENC_BIG_ENDIAN);
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_payloadFormart, 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);
/* The first 4 types not supporting now */
if (attrType > 4 && 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);
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;
}
if (subProtocol_handle[payloadFormart])
call_dissector(subProtocol_handle[payloadFormart], tvb_new_subset_length(tvb, offset, payloadLen), pinfo, li5g_tree);
if (parent)
li5g_tree->parent=parent;
/* have another li5g in the same packet? */
if (tvb_captured_length(tvb)>offset+payloadLen)
dissect_li5g(tvb_new_subset_remaining(tvb, offset+payloadLen), pinfo, tree, NULL);
/* set these info at the end*/
col_set_str(pinfo->cinfo, COL_PROTOCOL, "5GLI");
col_clear_fence(pinfo->cinfo, COL_INFO);
col_clear(pinfo->cinfo, COL_INFO);
if (pduType <= 4)
col_set_str(pinfo->cinfo, COL_INFO, pdu_info_str[pduType]);
/* 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 gboolean
dissect_li5g_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *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 disect every time */
*(dissector_handle_t *)data = li5g_handle;
dissect_li5g(tvb, pinfo, tree, data);
return TRUE;
}
void
proto_register_li5g(void)
{
memset(ett_attrContents, -1, sizeof(ett_attrContents));
memset(hf_li5g_attrContents, -1, sizeof(hf_li5g_attrContents));
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, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_headerLen, { "Header Length", "li5g.hl", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_payloadLen, { "Payload Length", "li5g.pl", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_payloadFormart, { "Payload Formart", "li5g.pf", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_payloadDirection, { "Payload Direction", "li5g.pd", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_xid, { "XID", "li5g.xid", FT_BYTES, 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, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrLen, { "Attribute Length", "li5g.attrLen", FT_UINT16, BASE_DEC, 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, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[17], { "Matched Target Identifier", "li5g.mti", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[18], { "Other Target Identifier", "li5g.oti", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_pld, { "Payload", "li5g.pld", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
};
static gint *ett[] = {
&ett_li5g,
&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],
};
proto_li5g = proto_register_protocol("5G Lawful Interception", "5GLI", "5gli");
proto_register_field_array(proto_li5g, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_li5g(void)
{
subProtocol_handle[2]=find_dissector_add_dependency("xiri", proto_li5g);
subProtocol_handle[5]=find_dissector("ip");
subProtocol_handle[6]=find_dissector("ipv6");
subProtocol_handle[7]=find_dissector("eth");
subProtocol_handle[8]=find_dissector("rtp");
subProtocol_handle[9]=find_dissector("sip");
subProtocol_handle[10]=find_dissector("dhcp");
subProtocol_handle[11]=find_dissector("radius");
subProtocol_handle[12]=find_dissector("gtp");
subProtocol_handle[13]=find_dissector("msrp");
li5g_handle = register_dissector("li5g", dissect_li5g, proto_li5g);
dissector_add_uint_range_with_preference("tcp.port", "", li5g_handle);
heur_dissector_add("tls", dissect_li5g_heur, "5G LI over TLS", "li5g_tls", proto_li5g, HEURISTIC_ENABLE);
}
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