2 * Copyright (c) 2003 Markus Friedl. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 #include <epan/packet.h>
34 static int proto_udpencap = -1;
35 static gint ett_udpencap = -1;
37 static dissector_handle_t esp_handle;
38 static dissector_handle_t isakmp_handle;
41 * UDP Encapsulation of IPsec Packets
42 * draft-ietf-ipsec-udp-encaps-06.txt
45 dissect_udpencap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
48 proto_tree *udpencap_tree = NULL;
49 proto_item *ti = NULL;
52 if (check_col(pinfo->cinfo, COL_PROTOCOL))
53 col_set_str(pinfo->cinfo, COL_PROTOCOL, "UDPENCAP");
54 if (check_col(pinfo->cinfo, COL_INFO))
55 col_clear(pinfo->cinfo, COL_INFO);
58 ti = proto_tree_add_item(tree, proto_udpencap, tvb, 0, -1, FALSE);
59 udpencap_tree = proto_item_add_subtree(ti, ett_udpencap);
62 /* First byte of 0 iindicates NAT-keepalive */
63 if (tvb_get_guint8(tvb, 0) == 0xff) {
65 proto_tree_add_text(udpencap_tree, tvb, 0, 1, "NAT-keepalive packet");
67 /* SPI of zero indicates IKE traffic, otherwise it's ESP */
68 tvb_memcpy(tvb, (guint8 *)&spi, 0, sizeof(spi));
71 proto_tree_add_text(udpencap_tree, tvb, 0, sizeof(spi),
73 proto_item_set_len(ti, sizeof(spi));
75 next_tvb = tvb_new_subset(tvb, sizeof(spi), -1, -1);
76 call_dissector(isakmp_handle, next_tvb, pinfo, tree);
79 proto_item_set_len(ti, 0);
80 call_dissector(esp_handle, tvb, pinfo, tree);
86 proto_register_udpencap(void)
88 static gint *ett[] = {
92 proto_udpencap = proto_register_protocol(
93 "UDP Encapsulation of IPsec Packets", "UDPENCAP", "udpencap");
94 proto_register_subtree_array(ett, array_length(ett));
98 proto_reg_handoff_udpencap(void)
100 dissector_handle_t udpencap_handle;
102 esp_handle = find_dissector("esp");
103 isakmp_handle = find_dissector("isakmp");
105 udpencap_handle = create_dissector_handle(dissect_udpencap, proto_udpencap);
106 dissector_add("udp.port", 4500, udpencap_handle);