From e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 10 Apr 2024 22:34:10 +0200 Subject: Adding upstream version 4.2.2. Signed-off-by: Daniel Baumann --- epan/dissectors/packet-amt.c | 338 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 338 insertions(+) create mode 100644 epan/dissectors/packet-amt.c (limited to 'epan/dissectors/packet-amt.c') diff --git a/epan/dissectors/packet-amt.c b/epan/dissectors/packet-amt.c new file mode 100644 index 00000000..05dc47eb --- /dev/null +++ b/epan/dissectors/packet-amt.c @@ -0,0 +1,338 @@ +/* packet-amt.c + * Routines for Automatic Multicast Tunneling (AMT) dissection + * Copyright 2017, Alexis La Goutte (See AUTHORS) + * + * Wireshark - Network traffic analyzer + * By Gerald Combs + * Copyright 1998 Gerald Combs + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +/* + * RFC 7450 : Automatic Multicast Tunneling + */ + +#include +#include +#include + +#define AMT_UDP_PORT 2268 + +void proto_reg_handoff_amt(void); +void proto_register_amt(void); + +static dissector_handle_t amt_handle; + +static int proto_amt = -1; +static int hf_amt_version = -1; +static int hf_amt_type = -1; +static int hf_amt_reserved = -1; +static int hf_amt_discovery_nonce = -1; +static int hf_amt_relay_address_ipv4 = -1; +static int hf_amt_relay_address_ipv6 = -1; +static int hf_amt_request_nonce = -1; +static int hf_amt_request_reserved = -1; +static int hf_amt_request_p = -1; +static int hf_amt_membership_query_reserved = -1; +static int hf_amt_membership_query_l = -1; +static int hf_amt_membership_query_g = -1; +static int hf_amt_response_mac = -1; +static int hf_amt_gateway_port_number = -1; +static int hf_amt_gateway_ip_address = -1; +static int hf_amt_multicast_data = -1; + +static expert_field ei_amt_relay_address_unknown = EI_INIT; +static expert_field ei_amt_unknown = EI_INIT; + +static gint ett_amt = -1; + +#define RELAY_DISCOVERY 1 +#define RELAY_ADVERTISEMENT 2 +#define REQUEST 3 +#define MEMBERSHIP_QUERY 4 +#define MEMBERSHIP_UPDATE 5 +#define MULTICAST_DATA 6 +#define TEARDOWN 7 + +static const value_string amt_type_vals[] = { + { RELAY_DISCOVERY, "Relay Discovery" }, + { RELAY_ADVERTISEMENT, "Relay Advertisement" }, + { REQUEST, "Request" }, + { MEMBERSHIP_QUERY, "Membership Query" }, + { MEMBERSHIP_UPDATE, "Membership Update" }, + { MULTICAST_DATA, "Multicast Data" }, + { TEARDOWN, "Teardown" }, + {0, NULL } +}; + +static const true_false_string tfs_request_p = { + "IPv4 packet carrying an IGMPv3 General Query", + "IPv6 packet carrying an MLDv2 General Query" +}; + +static dissector_handle_t ip_handle; + +/* Code to actually dissect the packets */ +static int +dissect_amt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) +{ + proto_item *ti; + proto_tree *amt_tree; + guint offset = 0; + guint32 type; + tvbuff_t *next_tvb; + + col_set_str(pinfo->cinfo, COL_PROTOCOL, "AMT"); + + ti = proto_tree_add_item(tree, proto_amt, tvb, 0, -1, ENC_NA); + + amt_tree = proto_item_add_subtree(ti, ett_amt); + + proto_tree_add_item(amt_tree, hf_amt_version, tvb, offset, 1, ENC_NA); + proto_tree_add_item_ret_uint(amt_tree, hf_amt_type, tvb, offset, 1, ENC_NA, &type); + col_add_str(pinfo->cinfo, COL_INFO, val_to_str_const(type, amt_type_vals, "Unknown AMT TYPE")); + offset += 1; + + switch(type){ + case RELAY_DISCOVERY: /* 1 */ + proto_tree_add_item(amt_tree, hf_amt_reserved, tvb, offset, 3, ENC_NA); + offset += 3; + proto_tree_add_item(amt_tree, hf_amt_discovery_nonce, tvb, offset, 4, ENC_NA); + offset += 4; + break; + case RELAY_ADVERTISEMENT:{ /* 2 */ + guint32 relay_length; + proto_tree_add_item(amt_tree, hf_amt_reserved, tvb, offset, 3, ENC_NA); + offset += 3; + proto_tree_add_item(amt_tree, hf_amt_discovery_nonce, tvb, offset, 4, ENC_NA); + offset += 4; + relay_length = tvb_reported_length_remaining(tvb, offset); + switch(relay_length){ + case 4: /* IPv4 Address */ + proto_tree_add_item(amt_tree, hf_amt_relay_address_ipv4, tvb, offset, 4, ENC_NA); + offset += 4; + break; + case 16: /* IPv6 Address */ + proto_tree_add_item(amt_tree, hf_amt_relay_address_ipv6, tvb, offset, 16, ENC_NA); + offset += 16; + break; + default: /* Unknown type.. */ + proto_tree_add_expert(amt_tree, pinfo, &ei_amt_relay_address_unknown, tvb, offset, relay_length); + offset += relay_length; + break; + } + } + break; + case REQUEST: /* 3 */ + proto_tree_add_item(amt_tree, hf_amt_request_reserved, tvb, offset, 1, ENC_NA); + proto_tree_add_item(amt_tree, hf_amt_request_p, tvb, offset, 1, ENC_NA); + offset += 1; + proto_tree_add_item(amt_tree, hf_amt_reserved, tvb, offset, 2, ENC_NA); + offset += 2; + proto_tree_add_item(amt_tree, hf_amt_request_nonce, tvb, offset, 4, ENC_NA); + offset += 4; + break; + case MEMBERSHIP_QUERY:{ /* 4 */ + guint32 flags_g; + proto_tree_add_item(amt_tree, hf_amt_membership_query_reserved, tvb, offset, 1, ENC_NA); + proto_tree_add_item(amt_tree, hf_amt_membership_query_l, tvb, offset, 1, ENC_NA); + proto_tree_add_item_ret_uint(amt_tree, hf_amt_membership_query_g, tvb, offset, 1, ENC_NA, &flags_g); + offset += 1; + proto_tree_add_item(amt_tree, hf_amt_response_mac, tvb, offset, 6, ENC_NA); + offset += 6; + proto_tree_add_item(amt_tree, hf_amt_request_nonce, tvb, offset, 4, ENC_NA); + offset += 4; + next_tvb = tvb_new_subset_remaining(tvb, offset); + call_dissector(ip_handle, next_tvb, pinfo, amt_tree); + offset += tvb_reported_length_remaining(tvb, offset); + if(flags_g){ + offset -= 2; + offset -= 16; + proto_tree_add_item(amt_tree, hf_amt_gateway_port_number, tvb, offset, 2, ENC_NA); + offset += 2; + proto_tree_add_item(amt_tree, hf_amt_gateway_ip_address, tvb, offset, 16, ENC_NA); + offset += 16; + } + } + break; + case MEMBERSHIP_UPDATE: /* 5 */ + proto_tree_add_item(amt_tree, hf_amt_reserved, tvb, offset, 1, ENC_NA); + offset += 1; + proto_tree_add_item(amt_tree, hf_amt_response_mac, tvb, offset, 6, ENC_NA); + offset += 6; + proto_tree_add_item(amt_tree, hf_amt_request_nonce, tvb, offset, 4, ENC_NA); + offset += 4; + next_tvb = tvb_new_subset_remaining(tvb, offset); + call_dissector(ip_handle, next_tvb, pinfo, amt_tree); + offset += tvb_reported_length_remaining(tvb, offset); + break; + case MULTICAST_DATA: /* 6 */ + proto_tree_add_item(amt_tree, hf_amt_reserved, tvb, offset, 1, ENC_NA); + offset += 1; + proto_tree_add_item(amt_tree, hf_amt_multicast_data, tvb, offset, -1, ENC_NA); + next_tvb = tvb_new_subset_remaining(tvb, offset); + call_dissector(ip_handle, next_tvb, pinfo, amt_tree); + offset += tvb_reported_length_remaining(tvb, offset); + break; + case TEARDOWN:{ /* 7 */ + proto_tree_add_item(amt_tree, hf_amt_reserved, tvb, offset, 1, ENC_NA); + offset += 1; + proto_tree_add_item(amt_tree, hf_amt_response_mac, tvb, offset, 6, ENC_NA); + offset += 6; + proto_tree_add_item(amt_tree, hf_amt_request_nonce, tvb, offset, 4, ENC_NA); + offset += 4; + proto_tree_add_item(amt_tree, hf_amt_gateway_port_number, tvb, offset, 2, ENC_NA); + offset += 2; + proto_tree_add_item(amt_tree, hf_amt_gateway_ip_address, tvb, offset, 16, ENC_NA); + offset += 16; + } + break; + default:{ + guint32 len_unknown; + len_unknown = tvb_reported_length_remaining(tvb, offset); + proto_tree_add_expert(amt_tree, pinfo, &ei_amt_unknown, tvb, offset, len_unknown); + offset += len_unknown; + } + break; + } + return offset; +} + +void +proto_register_amt(void) +{ + expert_module_t *expert_amt; + + static hf_register_info hf[] = { + { &hf_amt_version, + { "Version", "amt.version", + FT_UINT8, BASE_DEC, NULL, 0xF0, + "Must be always 0", HFILL } + }, + { &hf_amt_type, + { "Type", "amt.type", + FT_UINT8, BASE_DEC, VALS(amt_type_vals), 0x0F, + NULL, HFILL } + }, + { &hf_amt_reserved, + { "Reserved", "amt.reserved", + FT_BYTES, BASE_NONE, NULL, 0x0, + NULL, HFILL } + }, + { &hf_amt_discovery_nonce, + { "Discovery Nonce", "amt.discovery_nonce", + FT_UINT32, BASE_HEX, NULL, 0x0, + NULL, HFILL } + }, + { &hf_amt_relay_address_ipv4, + { "Relay Address (IPv4)", "amt.relay_address.ipv4", + FT_IPv4, BASE_NONE, NULL, 0x0, + NULL, HFILL } + }, + { &hf_amt_relay_address_ipv6, + { "Relay Address (IPv6)", "amt.relay_address.ipv6", + FT_IPv6, BASE_NONE, NULL, 0x0, + NULL, HFILL } + }, + { &hf_amt_request_nonce, + { "Request Nonce", "amt.request_nonce", + FT_UINT32, BASE_HEX, NULL, 0x0, + NULL, HFILL } + }, + { &hf_amt_request_reserved, + { "Reserved", "amt.request.reserved", + FT_UINT8, BASE_HEX, NULL, 0xFE, + NULL, HFILL } + }, + { &hf_amt_request_p, + { "P Flags", "amt.request.p", + FT_BOOLEAN, 8, TFS(&tfs_request_p), 0x01, + NULL, HFILL } + }, + { &hf_amt_membership_query_reserved, + { "Reserved", "amt.membership_query.reserved", + FT_UINT8, BASE_HEX, NULL, 0xFC, + NULL, HFILL } + }, + { &hf_amt_membership_query_l, + { "L Flags", "amt.membership_query.l", + FT_UINT8, BASE_DEC, NULL, 0x02, + NULL, HFILL } + }, + { &hf_amt_membership_query_g, + { "G Flags", "amt.membership_query.g", + FT_UINT8, BASE_DEC, NULL, 0x01, + NULL, HFILL } + }, + { &hf_amt_response_mac, + { "Response MAC", "amt.response_mac", + FT_UINT48, BASE_HEX, NULL, 0x0, + NULL, HFILL } + }, + { &hf_amt_gateway_port_number, + { "Gateway Port Number", "amt.gateway.port_number", + FT_UINT16, BASE_DEC, NULL, 0x0, + NULL, HFILL } + }, + { &hf_amt_gateway_ip_address, + { "Gateway IP Address", "amt.gateway.ip_address", + FT_IPv6, BASE_NONE, NULL, 0x0, + NULL, HFILL } + }, + { &hf_amt_multicast_data, + { "Multicast Data", "amt.multicast_data", + FT_BYTES, BASE_NONE, NULL, 0x0, + NULL, HFILL } + }, + }; + + static gint *ett[] = { + &ett_amt + }; + + + static ei_register_info ei[] = { + { &ei_amt_relay_address_unknown, + { "amt.relay_address.unknown", PI_UNDECODED, PI_NOTE, + "Relay Address (Unknown Type)", EXPFILL } + }, + { &ei_amt_unknown, + { "amt.unknown", PI_UNDECODED, PI_NOTE, + "Unknown Data", EXPFILL } + } + }; + + + proto_amt = proto_register_protocol("Automatic Multicast Tunneling", "AMT", "amt"); + + proto_register_field_array(proto_amt, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); + + + expert_amt = expert_register_protocol(proto_amt); + expert_register_field_array(expert_amt, ei, array_length(ei)); + + amt_handle = register_dissector("amt", dissect_amt, proto_amt); +} + +void +proto_reg_handoff_amt(void) +{ + ip_handle = find_dissector_add_dependency("ip", proto_amt); + + dissector_add_uint_with_preference("udp.port", AMT_UDP_PORT, amt_handle); +} + +/* + * Editor modelines - https://www.wireshark.org/tools/modelines.html + * + * Local variables: + * c-basic-offset: 4 + * tab-width: 8 + * indent-tabs-mode: nil + * End: + * + * vi: set shiftwidth=4 tabstop=8 expandtab: + * :indentSize=4:tabSize=8:noTabs=true: + */ -- cgit v1.2.3