109 lines
3.0 KiB
C
109 lines
3.0 KiB
C
/*
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* Copyright (c) 2003 Markus Friedl. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "config.h"
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#include <epan/packet.h>
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void proto_register_udpencap(void);
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void proto_reg_handoff_udpencap(void);
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#define UDPENCAP_PORT 4500
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static int proto_udpencap = -1;
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static int hf_nat_keepalive = -1;
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static int hf_non_esp_marker = -1;
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static gint ett_udpencap = -1;
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static dissector_handle_t esp_handle;
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static dissector_handle_t isakmp_handle;
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/*
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* UDP Encapsulation of IPsec Packets
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* draft-ietf-ipsec-udp-encaps-06.txt
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*/
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static int
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dissect_udpencap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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tvbuff_t *next_tvb;
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proto_tree *udpencap_tree;
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proto_item *ti;
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guint32 spi;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "UDPENCAP");
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col_clear(pinfo->cinfo, COL_INFO);
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ti = proto_tree_add_item(tree, proto_udpencap, tvb, 0, -1, ENC_NA);
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udpencap_tree = proto_item_add_subtree(ti, ett_udpencap);
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/* 1 byte of 0xFF indicates NAT-keepalive */
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if ((tvb_captured_length(tvb) == 1) && (tvb_get_guint8(tvb, 0) == 0xff)) {
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col_set_str(pinfo->cinfo, COL_INFO, "NAT-keepalive");
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proto_tree_add_item(udpencap_tree, hf_nat_keepalive, tvb, 0, 1, ENC_NA);
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} else {
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/* SPI of zero indicates IKE traffic, otherwise it's ESP */
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spi = tvb_get_ntohl(tvb, 0);
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if (spi == 0) {
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col_set_str(pinfo->cinfo, COL_INFO, "ISAKMP");
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proto_tree_add_item(udpencap_tree, hf_non_esp_marker, tvb, 0, 4, ENC_NA);
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proto_item_set_len(ti, 4);
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next_tvb = tvb_new_subset_remaining(tvb, 4);
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call_dissector(isakmp_handle, next_tvb, pinfo, tree);
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} else {
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col_set_str(pinfo->cinfo, COL_INFO, "ESP");
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proto_item_set_len(ti, 0);
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call_dissector(esp_handle, tvb, pinfo, tree);
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}
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}
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return tvb_captured_length(tvb);
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}
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void
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proto_register_udpencap(void)
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{
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static hf_register_info hf[] = {
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{ &hf_nat_keepalive, { "NAT-keepalive packet", "udpencap.nat_keepalive",
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FT_NONE, BASE_NONE, NULL, 0, NULL, HFILL }},
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{ &hf_non_esp_marker, { "Non-ESP Marker", "udpencap.non_esp_marker",
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FT_NONE, BASE_NONE, NULL, 0, NULL, HFILL }},
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};
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static gint *ett[] = {
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&ett_udpencap,
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};
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proto_udpencap = proto_register_protocol("UDP Encapsulation of IPsec Packets", "UDPENCAP", "udpencap");
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proto_register_field_array(proto_udpencap, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_udpencap(void)
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{
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dissector_handle_t udpencap_handle;
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esp_handle = find_dissector_add_dependency("esp", proto_udpencap);
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isakmp_handle = find_dissector_add_dependency("isakmp", proto_udpencap);
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udpencap_handle = create_dissector_handle(dissect_udpencap, proto_udpencap);
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dissector_add_uint_with_preference("udp.port", UDPENCAP_PORT, udpencap_handle);
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local Variables:
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* c-basic-offset: 2
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* ex: set shiftwidth=2 tabstop=8 expandtab:
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* :indentSize=2:tabSize=8:noTabs=true:
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*/
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