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// Copyright 2017 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <array>
#include <cstring>
#include <unordered_map>
#include <vector>
#include "common/common_types.h"
#include "common/logging/log.h"
#include "core/core_timing.h"
#include "core/hle/kernel/event.h"
#include "core/hle/kernel/shared_memory.h"
#include "core/hle/result.h"
#include "core/hle/service/nwm/nwm_uds.h"
#include "core/hle/service/nwm/uds_beacon.h"
#include "core/memory.h"
namespace Service {
namespace NWM {
// Event that is signaled every time the connection status changes.
static Kernel::SharedPtr<Kernel::Event> connection_status_event;
// Shared memory provided by the application to store the receive buffer.
// This is not currently used.
static Kernel::SharedPtr<Kernel::SharedMemory> recv_buffer_memory;
// Connection status of this 3DS.
static ConnectionStatus connection_status{};
/* Node information about the current network.
* The amount of elements in this vector is always the maximum number
* of nodes specified in the network configuration.
* The first node is always the host, so this always contains at least 1 entry.
*/
static NodeList node_info(1);
// Mapping of bind node ids to their respective events.
static std::unordered_map<u32, Kernel::SharedPtr<Kernel::Event>> bind_node_events;
// The WiFi network channel that the network is currently on.
// Since we're not actually interacting with physical radio waves, this is just a dummy value.
static u8 network_channel = DefaultNetworkChannel;
// Information about the network that we're currently connected to.
static NetworkInfo network_info;
// Event that will generate and send the 802.11 beacon frames.
static int beacon_broadcast_event;
/**
* NWM_UDS::Shutdown service function
* Inputs:
* 1 : None
* Outputs:
* 0 : Return header
* 1 : Result of function, 0 on success, otherwise error code
*/
static void Shutdown(Interface* self) {
u32* cmd_buff = Kernel::GetCommandBuffer();
// TODO(purpasmart): Verify return header on HW
cmd_buff[1] = RESULT_SUCCESS.raw;
LOG_WARNING(Service_NWM, "(STUBBED) called");
}
/**
* NWM_UDS::RecvBeaconBroadcastData service function
* Returns the raw beacon data for nearby networks that match the supplied WlanCommId.
* Inputs:
* 1 : Output buffer max size
* 2-3 : Unknown
* 4-5 : Host MAC address.
* 6-14 : Unused
* 15 : WLan Comm Id
* 16 : Id
* 17 : Value 0
* 18 : Input handle
* 19 : (Size<<4) | 12
* 20 : Output buffer ptr
* Outputs:
* 0 : Return header
* 1 : Result of function, 0 on success, otherwise error code
*/
static void RecvBeaconBroadcastData(Interface* self) {
IPC::RequestParser rp(Kernel::GetCommandBuffer(), 0x0F, 16, 4);
u32 out_buffer_size = rp.Pop<u32>();
u32 unk1 = rp.Pop<u32>();
u32 unk2 = rp.Pop<u32>();
MacAddress mac_address;
rp.PopRaw(mac_address);
rp.Skip(9, false);
u32 wlan_comm_id = rp.Pop<u32>();
u32 id = rp.Pop<u32>();
Kernel::Handle input_handle = rp.PopHandle();
size_t desc_size;
const VAddr out_buffer_ptr = rp.PopMappedBuffer(&desc_size);
ASSERT(desc_size == out_buffer_size);
VAddr current_buffer_pos = out_buffer_ptr;
u32 total_size = sizeof(BeaconDataReplyHeader);
// Retrieve all beacon frames that were received from the desired mac address.
std::deque<WifiPacket> beacons =
GetReceivedPackets(WifiPacket::PacketType::Beacon, mac_address);
BeaconDataReplyHeader data_reply_header{};
data_reply_header.total_entries = beacons.size();
data_reply_header.max_output_size = out_buffer_size;
Memory::WriteBlock(current_buffer_pos, &data_reply_header, sizeof(BeaconDataReplyHeader));
current_buffer_pos += sizeof(BeaconDataReplyHeader);
// Write each of the received beacons into the buffer
for (const auto& beacon : beacons) {
BeaconEntryHeader entry{};
// TODO(Subv): Figure out what this size is used for.
entry.unk_size = sizeof(BeaconEntryHeader) + beacon.data.size();
entry.total_size = sizeof(BeaconEntryHeader) + beacon.data.size();
entry.wifi_channel = beacon.channel;
entry.header_size = sizeof(BeaconEntryHeader);
entry.mac_address = beacon.transmitter_address;
ASSERT(current_buffer_pos < out_buffer_ptr + out_buffer_size);
Memory::WriteBlock(current_buffer_pos, &entry, sizeof(BeaconEntryHeader));
current_buffer_pos += sizeof(BeaconEntryHeader);
Memory::WriteBlock(current_buffer_pos, beacon.data.data(), beacon.data.size());
current_buffer_pos += beacon.data.size();
total_size += sizeof(BeaconEntryHeader) + beacon.data.size();
}
// Update the total size in the structure and write it to the buffer again.
data_reply_header.total_size = total_size;
Memory::WriteBlock(out_buffer_ptr, &data_reply_header, sizeof(BeaconDataReplyHeader));
IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
rb.Push(RESULT_SUCCESS);
LOG_DEBUG(Service_NWM, "called out_buffer_size=0x%08X, wlan_comm_id=0x%08X, id=0x%08X,"
"input_handle=0x%08X, out_buffer_ptr=0x%08X, unk1=0x%08X, unk2=0x%08X",
out_buffer_size, wlan_comm_id, id, input_handle, out_buffer_ptr, unk1, unk2);
}
/**
* NWM_UDS::Initialize service function
* Inputs:
* 1 : Shared memory size
* 2-11 : Input NodeInfo Structure
* 12 : 2-byte Version
* 13 : Value 0
* 14 : Shared memory handle
* Outputs:
* 0 : Return header
* 1 : Result of function, 0 on success, otherwise error code
* 2 : Value 0
* 3 : Output event handle
*/
static void InitializeWithVersion(Interface* self) {
IPC::RequestParser rp(Kernel::GetCommandBuffer(), 0x1B, 12, 2);
u32 sharedmem_size = rp.Pop<u32>();
// Update the node information with the data the game gave us.
rp.PopRaw(node_info[0]);
u16 version = rp.Pop<u16>();
Kernel::Handle sharedmem_handle = rp.PopHandle();
recv_buffer_memory = Kernel::g_handle_table.Get<Kernel::SharedMemory>(sharedmem_handle);
ASSERT_MSG(recv_buffer_memory->size == sharedmem_size, "Invalid shared memory size.");
// Reset the connection status, it contains all zeros after initialization,
// except for the actual status value.
connection_status = {};
connection_status.status = static_cast<u32>(NetworkStatus::NotConnected);
IPC::RequestBuilder rb = rp.MakeBuilder(1, 2);
rb.Push(RESULT_SUCCESS);
rb.PushCopyHandles(Kernel::g_handle_table.Create(connection_status_event).MoveFrom());
LOG_DEBUG(Service_NWM, "called sharedmem_size=0x%08X, version=0x%08X, sharedmem_handle=0x%08X",
sharedmem_size, version, sharedmem_handle);
}
/**
* NWM_UDS::GetConnectionStatus service function.
* Returns the connection status structure for the currently open network connection.
* This structure contains information about the connection,
* like the number of connected nodes, etc.
* Inputs:
* 0 : Command header.
* Outputs:
* 0 : Return header
* 1 : Result of function, 0 on success, otherwise error code
* 2-13 : Channel of the current WiFi network connection.
*/
static void GetConnectionStatus(Interface* self) {
IPC::RequestParser rp(Kernel::GetCommandBuffer(), 0xB, 0, 0);
IPC::RequestBuilder rb = rp.MakeBuilder(13, 0);
rb.Push(RESULT_SUCCESS);
rb.PushRaw(connection_status);
LOG_DEBUG(Service_NWM, "called");
}
/**
* NWM_UDS::Bind service function.
* Binds a BindNodeId to a data channel and retrieves a data event.
* Inputs:
* 1 : BindNodeId
* 2 : Receive buffer size.
* 3 : u8 Data channel to bind to.
* 4 : Network node id.
* Outputs:
* 0 : Return header
* 1 : Result of function, 0 on success, otherwise error code
* 2 : Copy handle descriptor.
* 3 : Data available event handle.
*/
static void Bind(Interface* self) {
IPC::RequestParser rp(Kernel::GetCommandBuffer(), 0x12, 4, 0);
u32 bind_node_id = rp.Pop<u32>();
u32 recv_buffer_size = rp.Pop<u32>();
u8 data_channel = rp.Pop<u8>();
u16 network_node_id = rp.Pop<u16>();
// TODO(Subv): Store the data channel and verify it when receiving data frames.
LOG_DEBUG(Service_NWM, "called");
if (data_channel == 0) {
IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
rb.Push(ResultCode(ErrorDescription::NotAuthorized, ErrorModule::UDS,
ErrorSummary::WrongArgument, ErrorLevel::Usage));
return;
}
// Create a new event for this bind node.
// TODO(Subv): Signal this event when new data is received on this data channel.
auto event = Kernel::Event::Create(Kernel::ResetType::OneShot,
"NWM::BindNodeEvent" + std::to_string(bind_node_id));
bind_node_events[bind_node_id] = event;
IPC::RequestBuilder rb = rp.MakeBuilder(1, 2);
rb.Push(RESULT_SUCCESS);
rb.PushCopyHandles(Kernel::g_handle_table.Create(event).MoveFrom());
}
/**
* NWM_UDS::BeginHostingNetwork service function.
* Creates a network and starts broadcasting its presence.
* Inputs:
* 1 : Passphrase buffer size.
* 3 : VAddr of the NetworkInfo structure.
* 5 : VAddr of the passphrase.
* Outputs:
* 0 : Return header
* 1 : Result of function, 0 on success, otherwise error code
*/
static void BeginHostingNetwork(Interface* self) {
IPC::RequestParser rp(Kernel::GetCommandBuffer(), 0x1D, 1, 4);
const u32 passphrase_size = rp.Pop<u32>();
size_t desc_size;
const VAddr network_info_address = rp.PopStaticBuffer(&desc_size, false);
ASSERT(desc_size == sizeof(NetworkInfo));
const VAddr passphrase_address = rp.PopStaticBuffer(&desc_size, false);
ASSERT(desc_size == passphrase_size);
// TODO(Subv): Store the passphrase and verify it when attempting a connection.
LOG_DEBUG(Service_NWM, "called");
Memory::ReadBlock(network_info_address, &network_info, sizeof(NetworkInfo));
// The real UDS module throws a fatal error if this assert fails.
ASSERT_MSG(network_info.max_nodes > 1, "Trying to host a network of only one member.");
connection_status.status = static_cast<u32>(NetworkStatus::ConnectedAsHost);
// Ensure the application data size is less than the maximum value.
ASSERT_MSG(network_info.application_data_size <= ApplicationDataSize, "Data size is too big.");
// Set up basic information for this network.
network_info.oui_value = NintendoOUI;
network_info.oui_type = static_cast<u8>(NintendoTagId::NetworkInfo);
connection_status.max_nodes = network_info.max_nodes;
// Resize the nodes list to hold max_nodes.
node_info.resize(network_info.max_nodes);
// There's currently only one node in the network (the host).
connection_status.total_nodes = 1;
network_info.total_nodes = 1;
// The host is always the first node
connection_status.network_node_id = 1;
node_info[0].network_node_id = 1;
// Set the bit 0 in the nodes bitmask to indicate that node 1 is already taken.
connection_status.node_bitmask |= 1;
// If the game has a preferred channel, use that instead.
if (network_info.channel != 0)
network_channel = network_info.channel;
connection_status_event->Signal();
// Start broadcasting the network, send a beacon frame every 102.4ms.
CoreTiming::ScheduleEvent(msToCycles(DefaultBeaconInterval * MillisecondsPerTU),
beacon_broadcast_event, 0);
LOG_WARNING(Service_NWM,
"An UDS network has been created, but broadcasting it is unimplemented.");
IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
rb.Push(RESULT_SUCCESS);
}
/**
* NWM_UDS::DestroyNetwork service function.
* Closes the network that we're currently hosting.
* Inputs:
* 0 : Command header.
* Outputs:
* 0 : Return header
* 1 : Result of function, 0 on success, otherwise error code
*/
static void DestroyNetwork(Interface* self) {
IPC::RequestParser rp(Kernel::GetCommandBuffer(), 0x08, 0, 0);
// TODO(Subv): Find out what happens if this is called while
// no network is being hosted.
// Unschedule the beacon broadcast event.
CoreTiming::UnscheduleEvent(beacon_broadcast_event, 0);
connection_status.status = static_cast<u8>(NetworkStatus::NotConnected);
connection_status_event->Signal();
IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
rb.Push(RESULT_SUCCESS);
LOG_WARNING(Service_NWM, "called");
}
/**
* NWM_UDS::GetChannel service function.
* Returns the WiFi channel in which the network we're connected to is transmitting.
* Inputs:
* 0 : Command header.
* Outputs:
* 0 : Return header
* 1 : Result of function, 0 on success, otherwise error code
* 2 : Channel of the current WiFi network connection.
*/
static void GetChannel(Interface* self) {
IPC::RequestParser rp(Kernel::GetCommandBuffer(), 0x1A, 0, 0);
IPC::RequestBuilder rb = rp.MakeBuilder(2, 0);
bool is_connected = connection_status.status != static_cast<u32>(NetworkStatus::NotConnected);
u8 channel = is_connected ? network_channel : 0;
rb.Push(RESULT_SUCCESS);
rb.Push(channel);
LOG_DEBUG(Service_NWM, "called");
}
/**
* NWM_UDS::SetApplicationData service function.
* Updates the application data that is being broadcast in the beacon frames
* for the network that we're hosting.
* Inputs:
* 1 : Data size.
* 3 : VAddr of the data.
* Outputs:
* 0 : Return header
* 1 : Result of function, 0 on success, otherwise error code
* 2 : Channel of the current WiFi network connection.
*/
static void SetApplicationData(Interface* self) {
IPC::RequestParser rp(Kernel::GetCommandBuffer(), 0x1A, 1, 2);
u32 size = rp.Pop<u32>();
size_t desc_size;
const VAddr address = rp.PopStaticBuffer(&desc_size, false);
ASSERT(desc_size == size);
LOG_DEBUG(Service_NWM, "called");
IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
if (size > ApplicationDataSize) {
rb.Push(ResultCode(ErrorDescription::TooLarge, ErrorModule::UDS,
ErrorSummary::WrongArgument, ErrorLevel::Usage));
return;
}
network_info.application_data_size = size;
Memory::ReadBlock(address, network_info.application_data.data(), size);
rb.Push(RESULT_SUCCESS);
}
/**
* NWM_UDS::DecryptBeaconData service function.
* Decrypts the encrypted data tags contained in the 802.11 beacons.
* Inputs:
* 1 : Input network struct buffer descriptor.
* 2 : Input network struct buffer ptr.
* 3 : Input tag0 encrypted buffer descriptor.
* 4 : Input tag0 encrypted buffer ptr.
* 5 : Input tag1 encrypted buffer descriptor.
* 6 : Input tag1 encrypted buffer ptr.
* 64 : Output buffer descriptor.
* 65 : Output buffer ptr.
* Outputs:
* 0 : Return header
* 1 : Result of function, 0 on success, otherwise error code
*/
static void DecryptBeaconData(Interface* self) {
IPC::RequestParser rp(Kernel::GetCommandBuffer(), 0x1F, 0, 6);
size_t desc_size;
const VAddr network_struct_addr = rp.PopStaticBuffer(&desc_size);
ASSERT(desc_size == sizeof(NetworkInfo));
size_t data0_size;
const VAddr encrypted_data0_addr = rp.PopStaticBuffer(&data0_size);
size_t data1_size;
const VAddr encrypted_data1_addr = rp.PopStaticBuffer(&data1_size);
size_t output_buffer_size;
const VAddr output_buffer_addr = rp.PeekStaticBuffer(0, &output_buffer_size);
// This size is hardcoded in the 3DS UDS code.
ASSERT(output_buffer_size == sizeof(NodeInfo) * UDSMaxNodes);
LOG_WARNING(Service_NWM, "called in0=%08X in1=%08X out=%08X", encrypted_data0_addr,
encrypted_data1_addr, output_buffer_addr);
NetworkInfo net_info;
Memory::ReadBlock(network_struct_addr, &net_info, sizeof(net_info));
// Read the encrypted data.
// The first 4 bytes should be the OUI and the OUI Type of the tags.
std::array<u8, 3> oui;
Memory::ReadBlock(encrypted_data0_addr, oui.data(), oui.size());
ASSERT_MSG(oui == NintendoOUI, "Unexpected OUI");
Memory::ReadBlock(encrypted_data1_addr, oui.data(), oui.size());
ASSERT_MSG(oui == NintendoOUI, "Unexpected OUI");
ASSERT_MSG(Memory::Read8(encrypted_data0_addr + 3) ==
static_cast<u8>(NintendoTagId::EncryptedData0),
"Unexpected tag id");
ASSERT_MSG(Memory::Read8(encrypted_data1_addr + 3) ==
static_cast<u8>(NintendoTagId::EncryptedData1),
"Unexpected tag id");
std::vector<u8> beacon_data(data0_size + data1_size);
Memory::ReadBlock(encrypted_data0_addr + 4, beacon_data.data(), data0_size);
Memory::ReadBlock(encrypted_data1_addr + 4, beacon_data.data() + data0_size, data1_size);
// Decrypt the data
DecryptBeaconData(net_info, beacon_data);
// The beacon data header contains the MD5 hash of the data.
BeaconData beacon_header;
std::memcpy(&beacon_header, beacon_data.data(), sizeof(beacon_header));
// TODO(Subv): Verify the MD5 hash of the data and return 0xE1211005 if invalid.
u8 num_nodes = net_info.max_nodes;
std::vector<NodeInfo> nodes;
for (int i = 0; i < num_nodes; ++i) {
BeaconNodeInfo info;
std::memcpy(&info, beacon_data.data() + sizeof(beacon_header) + i * sizeof(info),
sizeof(info));
// Deserialize the node information.
NodeInfo node{};
node.friend_code_seed = info.friend_code_seed;
node.network_node_id = info.network_node_id;
for (int i = 0; i < info.username.size(); ++i)
node.username[i] = info.username[i];
nodes.push_back(node);
}
Memory::ZeroBlock(output_buffer_addr, sizeof(NodeInfo) * UDSMaxNodes);
Memory::WriteBlock(output_buffer_addr, nodes.data(), sizeof(NodeInfo) * nodes.size());
IPC::RequestBuilder rb = rp.MakeBuilder(1, 2);
rb.PushStaticBuffer(output_buffer_addr, output_buffer_size, 0);
rb.Push(RESULT_SUCCESS);
}
// Sends a 802.11 beacon frame with information about the current network.
static void BeaconBroadcastCallback(u64 userdata, int cycles_late) {
// Don't do anything if we're not actually hosting a network
if (connection_status.status != static_cast<u32>(NetworkStatus::ConnectedAsHost))
return;
// TODO(Subv): Actually send the beacon.
std::vector<u8> frame = GenerateBeaconFrame(network_info, node_info);
// Start broadcasting the network, send a beacon frame every 102.4ms.
CoreTiming::ScheduleEvent(msToCycles(DefaultBeaconInterval * MillisecondsPerTU) - cycles_late,
beacon_broadcast_event, 0);
}
const Interface::FunctionInfo FunctionTable[] = {
{0x00010442, nullptr, "Initialize (deprecated)"},
{0x00020000, nullptr, "Scrap"},
{0x00030000, Shutdown, "Shutdown"},
{0x00040402, nullptr, "CreateNetwork (deprecated)"},
{0x00050040, nullptr, "EjectClient"},
{0x00060000, nullptr, "EjectSpectator"},
{0x00070080, nullptr, "UpdateNetworkAttribute"},
{0x00080000, DestroyNetwork, "DestroyNetwork"},
{0x00090442, nullptr, "ConnectNetwork (deprecated)"},
{0x000A0000, nullptr, "DisconnectNetwork"},
{0x000B0000, GetConnectionStatus, "GetConnectionStatus"},
{0x000D0040, nullptr, "GetNodeInformation"},
{0x000E0006, nullptr, "DecryptBeaconData (deprecated)"},
{0x000F0404, RecvBeaconBroadcastData, "RecvBeaconBroadcastData"},
{0x00100042, SetApplicationData, "SetApplicationData"},
{0x00110040, nullptr, "GetApplicationData"},
{0x00120100, Bind, "Bind"},
{0x00130040, nullptr, "Unbind"},
{0x001400C0, nullptr, "PullPacket"},
{0x00150080, nullptr, "SetMaxSendDelay"},
{0x00170182, nullptr, "SendTo"},
{0x001A0000, GetChannel, "GetChannel"},
{0x001B0302, InitializeWithVersion, "InitializeWithVersion"},
{0x001D0044, BeginHostingNetwork, "BeginHostingNetwork"},
{0x001E0084, nullptr, "ConnectToNetwork"},
{0x001F0006, DecryptBeaconData, "DecryptBeaconData"},
{0x00200040, nullptr, "Flush"},
{0x00210080, nullptr, "SetProbeResponseParam"},
{0x00220402, nullptr, "ScanOnConnection"},
};
NWM_UDS::NWM_UDS() {
connection_status_event =
Kernel::Event::Create(Kernel::ResetType::OneShot, "NWM::connection_status_event");
Register(FunctionTable);
beacon_broadcast_event =
CoreTiming::RegisterEvent("UDS::BeaconBroadcastCallback", BeaconBroadcastCallback);
}
NWM_UDS::~NWM_UDS() {
network_info = {};
bind_node_events.clear();
connection_status_event = nullptr;
recv_buffer_memory = nullptr;
connection_status = {};
connection_status.status = static_cast<u32>(NetworkStatus::NotConnected);
CoreTiming::UnscheduleEvent(beacon_broadcast_event, 0);
}
} // namespace NWM
} // namespace Service
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