Add AMT (Automatic Multicast Tunneling) RFC7450 dissector

Change-Id: Ic5e52b76e84e1d02d614b34980f94fd1288c9760
Reviewed-on: https://code.wireshark.org/review/22594
Petri-Dish: Alexis La Goutte <alexis.lagoutte@gmail.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Anders Broman <a.broman58@gmail.com>

3 files changed, 352 insertions, 0 deletions

diff --git a/epan/dissectors/CMakeLists.txt b/epan/dissectors/CMakeLists.txt
index 75ac07ff02..0657f50572 100644
--- a/epan/dissectors/CMakeLists.txt
+++ b/epan/dissectors/CMakeLists.txt
@@ -248,6 +248,7 @@ set(DISSECTOR_SRC
 	packet-alljoyn.c
 	packet-amqp.c
 	packet-amr.c
+	packet-amt.c
 	packet-ancp.c
 	packet-ans.c
 	packet-ansi_637.c
diff --git a/epan/dissectors/Makefile.am b/epan/dissectors/Makefile.am
index ef85816f9a..907835f7db 100644
--- a/epan/dissectors/Makefile.am
+++ b/epan/dissectors/Makefile.am
@@ -270,6 +270,7 @@ DISSECTOR_SRC = \
 	packet-alljoyn.c	\
 	packet-amqp.c		\
 	packet-amr.c		\
+	packet-amt.c		\
 	packet-ancp.c		\
 	packet-ans.c		\
 	packet-ansi_637.c	\
diff --git a/epan/dissectors/packet-amt.c b/epan/dissectors/packet-amt.c
new file mode 100644
index 0000000000..a4b339505a
--- /dev/null
+++ b/epan/dissectors/packet-amt.c
@@ -0,0 +1,350 @@
+/* packet-amt.c
+ * Routines for Automatic Multicast Tunneling (AMT) dissection
+ * Copyright 2017, Alexis La Goutte (See AUTHORS)
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/*
+ * RFC 7450 : Automatic Multicast Tunneling
+ */
+
+#include <config.h>
+#include <epan/packet.h>
+#include <epan/expert.h>
+
+#define AMT_UDP_PORT 2268
+
+void proto_reg_handoff_amt(void);
+void proto_register_amt(void);
+
+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_fstr(pinfo->cinfo, COL_INFO, "%s", 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));
+
+}
+
+void
+proto_reg_handoff_amt(void)
+{
+    dissector_handle_t amt_handle;
+
+    ip_handle = find_dissector_add_dependency("ip", proto_amt);
+
+    amt_handle = create_dissector_handle(dissect_amt, 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:
+ */