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Merge pull request #4299 from B3n30/uds

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NWM_UDS: Fix some issues, cleanups, better PacketHandling
This commit is contained in:
Weiyi Wang 2018-10-07 13:56:59 -04:00 • committed by GitHub
commit 0b7b9a51d6
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2 changed files with 123 additions and 47 deletions
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164
src/core/hle/service/nwm/nwm_uds.cpp
View file

@ -11,6 +11,7 @@
#include <mutex>
#include <unordered_map>
#include <vector>
#include <boost/optional.hpp>
#include <cryptopp/osrng.h>
#include "common/common_types.h"
#include "common/logging/log.h"
@ -79,7 +80,11 @@ static u8 network_channel = DefaultNetworkChannel;
static NetworkInfo network_info;
// Mapping of mac addresses to their respective node_ids.
static std::map<MacAddress, u16> node_map;
struct Node {
bool connected;
u16 node_id;
};
static std::map<MacAddress, Node> node_map;
// Event that will generate and send the 802.11 beacon frames.
static CoreTiming::EventType* beacon_broadcast_event;
@ -107,6 +112,9 @@ static std::list<Network::WifiPacket> received_beacons;
// Network node id used when a SecureData packet is addressed to every connected node.
constexpr u16 BroadcastNetworkNodeId = 0xFFFF;
// The Host has always dest_node_id 1
constexpr u16 HostDestNodeId = 1;
/**
* Returns a list of received 802.11 beacon frames from the specified sender since the last call.
*/
@ -159,16 +167,20 @@ static void BroadcastNodeMap() {
packet.channel = network_channel;
packet.type = Network::WifiPacket::PacketType::NodeMap;
packet.destination_address = Network::BroadcastMac;
std::size_t size = node_map.size();
std::size_t num_entries = std::count_if(node_map.begin(), node_map.end(),
[](const auto& node) { return node.second.connected; });
using node_t = decltype(node_map)::value_type;
packet.data.resize(sizeof(size) + (sizeof(node_t::first) + sizeof(node_t::second)) * size);
std::memcpy(packet.data.data(), &size, sizeof(size));
std::size_t offset = sizeof(size);
packet.data.resize(sizeof(num_entries) +
(sizeof(node_t::first) + sizeof(node_t::second.node_id)) * num_entries);
std::memcpy(packet.data.data(), &num_entries, sizeof(num_entries));
std::size_t offset = sizeof(num_entries);
for (const auto& node : node_map) {
std::memcpy(packet.data.data() + offset, node.first.data(), sizeof(node.first));
std::memcpy(packet.data.data() + offset + sizeof(node.first), &node.second,
sizeof(node.second));
offset += sizeof(node.first) + sizeof(node.second);
if (node.second.connected) {
std::memcpy(packet.data.data() + offset, node.first.data(), sizeof(node.first));
std::memcpy(packet.data.data() + offset + sizeof(node.first), &node.second.node_id,
sizeof(node.second.node_id));
offset += sizeof(node.first) + sizeof(node.second.node_id);
}
}
SendPacket(packet);
@ -176,6 +188,11 @@ static void BroadcastNodeMap() {
static void HandleNodeMapPacket(const Network::WifiPacket& packet) {
std::lock_guard<std::mutex> lock(connection_status_mutex);
if (connection_status.status == static_cast<u32>(NetworkStatus::ConnectedAsHost)) {
LOG_DEBUG(Service_NWM, "Ignored NodeMapPacket since connection_status is host");
return;
}
node_map.clear();
std::size_t num_entries;
Network::MacAddress address;
@ -185,7 +202,8 @@ static void HandleNodeMapPacket(const Network::WifiPacket& packet) {
for (std::size_t i = 0; i < num_entries; ++i) {
std::memcpy(&address, packet.data.data() + offset, sizeof(address));
std::memcpy(&id, packet.data.data() + offset + sizeof(address), sizeof(id));
node_map[address] = id;
node_map[address].connected = true;
node_map[address].node_id = id;
offset += sizeof(address) + sizeof(id);
}
}
@ -218,7 +236,12 @@ void HandleAssociationResponseFrame(const Network::WifiPacket& packet) {
"Could not join network");
{
std::lock_guard<std::mutex> lock(connection_status_mutex);
ASSERT(connection_status.status == static_cast<u32>(NetworkStatus::Connecting));
if (connection_status.status != static_cast<u32>(NetworkStatus::Connecting)) {
LOG_DEBUG(Service_NWM,
"Ignored AssociationResponseFrame because connection status is {}",
connection_status.status);
return;
}
}
// Send the EAPoL-Start packet to the server.
@ -245,14 +268,21 @@ static void HandleEAPoLPacket(const Network::WifiPacket& packet) {
return;
}
auto node = DeserializeNodeInfoFromFrame(packet.data);
if (connection_status.max_nodes == connection_status.total_nodes) {
// Reject connection attempt
LOG_ERROR(Service_NWM, "Reached maximum nodes, but reject packet wasn't sent.");
// TODO(B3N30): Figure out what packet is sent here
auto node_it = node_map.find(packet.transmitter_address);
if (node_it == node_map.end()) {
LOG_DEBUG(Service_NWM, "Connection sequence aborted, because the AuthenticationFrame "
"of the client wasn't recieved");
return;
}
if (node_it->second.connected) {
LOG_DEBUG(Service_NWM,
"Connection sequence aborted, because the client is already connected");
return;
}
ASSERT(connection_status.max_nodes != connection_status.total_nodes);
auto node = DeserializeNodeInfoFromFrame(packet.data);
// Get an unused network node id
u16 node_id = GetNextAvailableNodeId();
@ -268,7 +298,8 @@ static void HandleEAPoLPacket(const Network::WifiPacket& packet) {
network_info.total_nodes++;
node_map[packet.transmitter_address] = node.network_node_id;
node_map[packet.transmitter_address].node_id = node.network_node_id;
node_map[packet.transmitter_address].connected = true;
BroadcastNodeMap();
@ -321,6 +352,7 @@ static void HandleEAPoLPacket(const Network::WifiPacket& packet) {
connection_status_event->Signal();
connection_event->Signal();
} else if (connection_status.status == static_cast<u32>(NetworkStatus::ConnectedAsClient)) {
// TODO(B3N30): Remove that section and send/receive a proper connection_status packet
// On a 3ds this packet wouldn't be addressed to already connected clients
// We use this information because in the current implementation the host
// isn't broadcasting the node information
@ -349,6 +381,14 @@ static void HandleSecureDataPacket(const Network::WifiPacket& packet) {
std::unique_lock<std::mutex> lock(connection_status_mutex, std::defer_lock);
std::lock(hle_lock, lock);
if (connection_status.status != static_cast<u32>(NetworkStatus::ConnectedAsHost) &&
connection_status.status != static_cast<u32>(NetworkStatus::ConnectedAsClient)) {
// TODO(B3N30): Handle spectators
LOG_DEBUG(Service_NWM, "Ignored SecureDataPacket, because connection status is {}",
connection_status.status);
return;
}
if (secure_data.src_node_id == connection_status.network_node_id) {
// Ignore packets that came from ourselves.
return;
@ -464,12 +504,24 @@ void HandleAuthenticationFrame(const Network::WifiPacket& packet) {
connection_status.status);
return;
}
if (node_map.find(packet.transmitter_address) != node_map.end()) {
LOG_ERROR(Service_NWM, "Connection sequence aborted, because there is already a "
"connected client with that MAC-Adress");
return;
}
if (connection_status.max_nodes == connection_status.total_nodes) {
// Reject connection attempt
LOG_ERROR(Service_NWM, "Reached maximum nodes, but reject packet wasn't sent.");
// TODO(B3N30): Figure out what packet is sent here
return;
}
// Respond with an authentication response frame with SEQ2
auth_request.channel = network_channel;
auth_request.data = GenerateAuthenticationFrame(AuthenticationSeq::SEQ2);
auth_request.destination_address = packet.transmitter_address;
auth_request.type = WifiPacket::PacketType::Authentication;
node_map[packet.transmitter_address].connected = false;
}
SendPacket(auth_request);
@ -492,17 +544,29 @@ void HandleDeauthenticationFrame(const Network::WifiPacket& packet) {
return;
}
u16 node_id = node_map[packet.transmitter_address];
auto node = std::find_if(node_info.begin(), node_info.end(), [&node_id](const NodeInfo& info) {
return info.network_node_id == node_id;
});
ASSERT(node != node_info.end());
Node node = node_map[packet.transmitter_address];
node_map.erase(packet.transmitter_address);
connection_status.node_bitmask &= ~(1 << (node_id - 1));
connection_status.changed_nodes |= 1 << (node_id - 1);
if (!node.connected) {
LOG_DEBUG(Service_NWM, "Received DeauthenticationFrame from a not connected MAC Address");
return;
}
auto node_it = std::find_if(node_info.begin(), node_info.end(), [&node](const NodeInfo& info) {
return info.network_node_id == node.node_id;
});
ASSERT(node_it != node_info.end());
connection_status.node_bitmask &= ~(1 << (node.node_id - 1));
connection_status.changed_nodes |= 1 << (node.node_id - 1);
connection_status.total_nodes--;
connection_status.nodes[node.node_id - 1] = 0;
network_info.total_nodes--;
// TODO(B3N30): broadcast new connection_status to clients
node_it->Reset();
connection_status_event->Signal();
}
@ -541,6 +605,26 @@ void OnWifiPacketReceived(const Network::WifiPacket& packet) {
}
}
static boost::optional<Network::MacAddress> GetNodeMacAddress(u16 dest_node_id, u8 flags) {
constexpr u8 BroadcastFlag = 0x2;
if ((flags & BroadcastFlag) || dest_node_id == BroadcastNetworkNodeId) {
// Broadcast
return Network::BroadcastMac;
} else if (dest_node_id == HostDestNodeId) {
// Destination is host
return network_info.host_mac_address;
}
// Destination is a specific client
auto destination =
std::find_if(node_map.begin(), node_map.end(), [dest_node_id](const auto& node) {
return node.second.node_id == dest_node_id && node.second.connected;
});
if (destination == node_map.end()) {
return {};
}
return destination->first;
}
void NWM_UDS::Shutdown(Kernel::HLERequestContext& ctx) {
IPC::RequestParser rp(ctx, 0x03, 0, 0);
@ -656,6 +740,7 @@ void NWM_UDS::InitializeWithVersion(Kernel::HLERequestContext& ctx) {
connection_status.status = static_cast<u32>(NetworkStatus::NotConnected);
node_info.clear();
node_info.push_back(current_node);
channel_data.clear();
}
IPC::RequestBuilder rb = rp.MakeBuilder(1, 2);
@ -1000,30 +1085,15 @@ void NWM_UDS::SendTo(Kernel::HLERequestContext& ctx) {
return;
}
Network::MacAddress dest_address;
if (flags >> 2) {
LOG_ERROR(Service_NWM, "Unexpected flags 0x{:02X}", flags);
}
if ((flags & (0x1 << 1)) || dest_node_id == 0xFFFF) {
// Broadcast
dest_address = Network::BroadcastMac;
} else if (dest_node_id != 1) {
// Send to specific client
auto destination =
std::find_if(node_map.begin(), node_map.end(),
[dest_node_id](const auto& node) { return node.second == dest_node_id; });
if (destination == node_map.end()) {
LOG_ERROR(Service_NWM, "tried to send packet to unknown dest id {}", dest_node_id);
rb.Push(ResultCode(ErrorDescription::NotFound, ErrorModule::UDS,
ErrorSummary::WrongArgument, ErrorLevel::Status));
return;
}
dest_address = destination->first;
} else {
// Send message to host
dest_address = network_info.host_mac_address;
auto dest_address = GetNodeMacAddress(dest_node_id, flags);
if (!dest_address) {
rb.Push(ResultCode(ErrorDescription::NotFound, ErrorModule::UDS,
ErrorSummary::WrongArgument, ErrorLevel::Status));
return;
}
constexpr std::size_t MaxSize = 0x5C6;
@ -1039,12 +1109,12 @@ void NWM_UDS::SendTo(Kernel::HLERequestContext& ctx) {
GenerateDataPayload(input_buffer, data_channel, dest_node_id,
connection_status.network_node_id, sequence_number);
// TODO(B3N30): Retrieve the MAC address of the dest_node_id and our own to encrypt
// TODO(B3N30): Use the MAC address of the dest_node_id and our own to encrypt
// and encapsulate the payload.
Network::WifiPacket packet;
packet.destination_address = dest_address;
packet.destination_address = *dest_address;
packet.channel = network_channel;
packet.data = std::move(data_payload);
packet.type = Network::WifiPacket::PacketType::Data;

6
src/core/hle/service/nwm/nwm_uds.h
View file

@ -36,6 +36,12 @@ struct NodeInfo {
INSERT_PADDING_BYTES(4);
u16_le network_node_id;
INSERT_PADDING_BYTES(6);
void Reset() {
friend_code_seed = 0;
username.fill(0);
network_node_id = 0;
}
};
static_assert(sizeof(NodeInfo) == 40, "NodeInfo has incorrect size.");