From 528dea988c9f8012a2872e78f168eac1b3161c57 Mon Sep 17 00:00:00 2001
From: Subv <subv2112@gmail.com>
Date: Sun, 19 Mar 2017 21:36:51 -0500
Subject: Services/UDS: Generate the UDS beacons when the beacon callback
 fires.

---
 src/core/hle/service/nwm/uds_beacon.h | 173 ++++++++++++++++++++++++++++++++++
 1 file changed, 173 insertions(+)
 create mode 100644 src/core/hle/service/nwm/uds_beacon.h

(limited to 'src/core/hle/service/nwm/uds_beacon.h')

diff --git a/src/core/hle/service/nwm/uds_beacon.h b/src/core/hle/service/nwm/uds_beacon.h
new file mode 100644
index 000000000..6df4c4f47
--- /dev/null
+++ b/src/core/hle/service/nwm/uds_beacon.h
@@ -0,0 +1,173 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <array>
+#include <deque>
+#include <vector>
+#include "common/common_types.h"
+#include "common/swap.h"
+#include "core/hle/service/service.h"
+
+namespace Service {
+namespace NWM {
+
+using MacAddress = std::array<u8, 6>;
+
+/// The maximum number of nodes that can exist in an UDS session.
+constexpr u32 UDSMaxNodes = 16;
+constexpr std::array<u8, 3> NintendoOUI = {0x00, 0x1F, 0x32};
+
+/// Additional block tag ids in the Beacon frames
+enum class TagId : u8 {
+    SSID = 0,
+    SupportedRates = 1,
+    DSParameterSet = 2,
+    TrafficIndicationMap = 5,
+    CountryInformation = 7,
+    ERPInformation = 42,
+    VendorSpecific = 221
+};
+
+/**
+ * Internal vendor-specific tag ids as stored inside
+ * VendorSpecific blocks in the Beacon frames.
+ */
+enum class NintendoTagId : u8 {
+    Dummy = 20,
+    NetworkInfo = 21,
+    EncryptedData0 = 24,
+    EncryptedData1 = 25,
+};
+
+struct BeaconEntryHeader {
+    u32_le total_size;
+    INSERT_PADDING_BYTES(1);
+    u8 wifi_channel;
+    INSERT_PADDING_BYTES(2);
+    MacAddress mac_address;
+    INSERT_PADDING_BYTES(6);
+    u32_le unk_size;
+    u32_le header_size;
+};
+
+static_assert(sizeof(BeaconEntryHeader) == 0x1C, "BeaconEntryHeader has incorrect size.");
+
+struct BeaconDataReplyHeader {
+    u32_le max_output_size;
+    u32_le total_size;
+    u32_le total_entries;
+};
+
+static_assert(sizeof(BeaconDataReplyHeader) == 12, "BeaconDataReplyHeader has incorrect size.");
+
+#pragma pack(push, 1)
+struct BeaconFrameHeader {
+    // Number of microseconds the AP has been active.
+    u64_le timestamp;
+    // Interval between beacon transmissions, expressed in TU.
+    u16_le beacon_interval;
+    // Indicates the presence of optional capabilities.
+    u16_le capabilities;
+};
+#pragma pack(pop)
+
+static_assert(sizeof(BeaconFrameHeader) == 12, "BeaconFrameHeader has incorrect size.");
+
+struct TagHeader {
+    u8 tag_id;
+    u8 length;
+};
+
+static_assert(sizeof(TagHeader) == 2, "TagHeader has incorrect size.");
+
+struct DummyTag {
+    TagHeader header;
+    std::array<u8, 3> oui;
+    u8 oui_type;
+    std::array<u8, 3> data;
+};
+
+static_assert(sizeof(DummyTag) == 9, "DummyTag has incorrect size.");
+
+struct NetworkInfoTag {
+    TagHeader header;
+    std::array<u8, 0x1F> network_info;
+    std::array<u8, 0x14> sha_hash;
+    u8 appdata_size;
+};
+
+static_assert(sizeof(NetworkInfoTag) == 54, "NetworkInfoTag has incorrect size.");
+
+struct EncryptedDataTag {
+    TagHeader header;
+    std::array<u8, 3> oui;
+    u8 oui_type;
+};
+
+static_assert(sizeof(EncryptedDataTag) == 6, "EncryptedDataTag has incorrect size.");
+
+#pragma pack(push, 1)
+// The raw bytes of this structure are the CTR used in the encryption (AES-CTR)
+// of the beacon data stored in the EncryptedDataTags.
+struct BeaconDataCryptoCTR {
+    MacAddress host_mac;
+    u32_le wlan_comm_id;
+    u8 id;
+    INSERT_PADDING_BYTES(1);
+    u32_le network_id;
+};
+
+static_assert(sizeof(BeaconDataCryptoCTR) == 0x10, "BeaconDataCryptoCTR has incorrect size.");
+
+struct BeaconNodeInfo {
+    u64_be friend_code_seed;
+    std::array<u16_be, 10> username;
+    u16_be network_node_id;
+};
+
+static_assert(sizeof(BeaconNodeInfo) == 0x1E, "BeaconNodeInfo has incorrect size.");
+
+struct BeaconData {
+    std::array<u8, 0x10> md5_hash;
+    u16_be bitmask;
+};
+#pragma pack(pop)
+
+static_assert(sizeof(BeaconData) == 0x12, "BeaconData has incorrect size.");
+
+/// Information about a received WiFi packet.
+/// Acts as our own 802.11 header.
+struct WifiPacket {
+    enum class PacketType { Beacon, Data };
+
+    PacketType type; ///< The type of 802.11 frame, Beacon / Data.
+
+    /// Raw 802.11 frame data, starting at the management frame header for management frames.
+    std::vector<u8> data;
+    MacAddress transmitter_address; ///< Mac address of the transmitter.
+    MacAddress destination_address; ///< Mac address of the receiver.
+    u8 channel;                     ///< WiFi channel where this frame was transmitted.
+};
+
+/**
+ * Decrypts the beacon data buffer for the network described by `network_info`.
+ */
+void DecryptBeaconData(const NetworkInfo& network_info, std::vector<u8>& buffer);
+
+/**
+ * Generates an 802.11 beacon frame starting at the management frame header.
+ * This frame contains information about the network and its connected clients.
+ * @returns The generated frame.
+ */
+std::vector<u8> GenerateBeaconFrame(const NetworkInfo& network_info, const NodeList& nodes);
+
+/**
+ * Returns a list of received 802.11 frames from the specified sender
+ * matching the type since the last call.
+ */
+std::deque<WifiPacket> GetReceivedPackets(WifiPacket::PacketType type, const MacAddress& sender);
+} // namespace NWM
+} // namespace Service
-- 
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