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Services/UDS: Handle the rest of the connection sequence. (#2963)

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Services/UDS: Handle the rest of the connection sequence.
This commit is contained in:
B3n30 2017-09-30 18:18:45 +02:00 committed by GitHub
parent 8244762b89
commit afb1012bcd
3 changed files with 251 additions and 20 deletions
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121
src/core/hle/service/nwm/nwm_uds.cpp
View file

@ -15,6 +15,7 @@
#include "core/hle/ipc_helpers.h"
#include "core/hle/kernel/event.h"
#include "core/hle/kernel/shared_memory.h"
#include "core/hle/lock.h"
#include "core/hle/result.h"
#include "core/hle/service/nwm/nwm_uds.h"
#include "core/hle/service/nwm/uds_beacon.h"
@ -100,6 +101,20 @@ void SendPacket(Network::WifiPacket& packet) {
// TODO(Subv): Implement.
}
/*
* Returns an available index in the nodes array for the
* currently-hosted UDS network.
*/
static u16 GetNextAvailableNodeId() {
for (u16 index = 0; index < connection_status.max_nodes; ++index) {
if ((connection_status.node_bitmask & (1 << index)) == 0)
return index;
}
// Any connection attempts to an already full network should have been refused.
ASSERT_MSG(false, "No available connection slots in the network");
}
// Inserts the received beacon frame in the beacon queue and removes any older beacons if the size
// limit is exceeded.
void HandleBeaconFrame(const Network::WifiPacket& packet) {
@ -143,18 +158,88 @@ void HandleAssociationResponseFrame(const Network::WifiPacket& packet) {
SendPacket(eapol_start);
}
/*
* Returns an available index in the nodes array for the
* currently-hosted UDS network.
*/
static u16 GetNextAvailableNodeId() {
for (u16 index = 0; index < connection_status.max_nodes; ++index) {
if ((connection_status.node_bitmask & (1 << index)) == 0)
return index;
}
static void HandleEAPoLPacket(const Network::WifiPacket& packet) {
std::lock_guard<std::mutex> lock(connection_status_mutex);
// Any connection attempts to an already full network should have been refused.
ASSERT_MSG(false, "No available connection slots in the network");
if (GetEAPoLFrameType(packet.data) == EAPoLStartMagic) {
if (connection_status.status != static_cast<u32>(NetworkStatus::ConnectedAsHost)) {
LOG_DEBUG(Service_NWM, "Connection sequence aborted, because connection status is %u",
connection_status.status);
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
return;
}
// Get an unused network node id
u16 node_id = GetNextAvailableNodeId();
node.network_node_id = node_id + 1;
connection_status.node_bitmask |= 1 << node_id;
connection_status.changed_nodes |= 1 << node_id;
connection_status.nodes[node_id] = node.network_node_id;
connection_status.total_nodes++;
u8 current_nodes = network_info.total_nodes;
node_info[current_nodes] = node;
network_info.total_nodes++;
// Send the EAPoL-Logoff packet.
using Network::WifiPacket;
WifiPacket eapol_logoff;
eapol_logoff.channel = network_channel;
eapol_logoff.data =
GenerateEAPoLLogoffFrame(packet.transmitter_address, node.network_node_id, node_info,
network_info.max_nodes, network_info.total_nodes);
// TODO(Subv): Encrypt the packet.
eapol_logoff.destination_address = packet.transmitter_address;
eapol_logoff.type = WifiPacket::PacketType::Data;
SendPacket(eapol_logoff);
// TODO(B3N30): Broadcast updated node list
// The 3ds does this presumably to support spectators.
std::lock_guard<std::recursive_mutex> lock(HLE::g_hle_lock);
connection_status_event->Signal();
} else {
if (connection_status.status != static_cast<u32>(NetworkStatus::NotConnected)) {
LOG_DEBUG(Service_NWM, "Connection sequence aborted, because connection status is %u",
connection_status.status);
return;
}
auto logoff = ParseEAPoLLogoffFrame(packet.data);
network_info.total_nodes = logoff.connected_nodes;
network_info.max_nodes = logoff.max_nodes;
connection_status.network_node_id = logoff.assigned_node_id;
connection_status.total_nodes = logoff.connected_nodes;
connection_status.max_nodes = logoff.max_nodes;
node_info.clear();
node_info.reserve(network_info.max_nodes);
for (size_t index = 0; index < logoff.connected_nodes; ++index) {
connection_status.node_bitmask |= 1 << index;
connection_status.changed_nodes |= 1 << index;
connection_status.nodes[index] = logoff.nodes[index].network_node_id;
node_info.emplace_back(DeserializeNodeInfo(logoff.nodes[index]));
}
// We're now connected, signal the application
connection_status.status = static_cast<u32>(NetworkStatus::ConnectedAsClient);
// Some games require ConnectToNetwork to block, for now it doesn't
// If blocking is implemented this lock needs to be changed,
// otherwise it might cause deadlocks
std::lock_guard<std::recursive_mutex> lock(HLE::g_hle_lock);
connection_status_event->Signal();
}
}
/*
@ -238,6 +323,17 @@ void HandleAuthenticationFrame(const Network::WifiPacket& packet) {
}
}
static void HandleDataFrame(const Network::WifiPacket& packet) {
switch (GetFrameEtherType(packet.data)) {
case EtherType::EAPoL:
HandleEAPoLPacket(packet);
break;
case EtherType::SecureData:
// TODO(B3N30): Handle SecureData packets
break;
}
}
/// Callback to parse and handle a received wifi packet.
void OnWifiPacketReceived(const Network::WifiPacket& packet) {
switch (packet.type) {
@ -250,6 +346,9 @@ void OnWifiPacketReceived(const Network::WifiPacket& packet) {
case Network::WifiPacket::PacketType::AssociationResponse:
HandleAssociationResponseFrame(packet);
break;
case Network::WifiPacket::PacketType::Data:
HandleDataFrame(packet);
break;
}
}

80
src/core/hle/service/nwm/uds_data.cpp
View file

@ -2,6 +2,7 @@
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <cstring>
#include <cryptopp/aes.h>
#include <cryptopp/ccm.h>
@ -277,10 +278,10 @@ std::vector<u8> GenerateDataPayload(const std::vector<u8>& data, u8 channel, u16
std::vector<u8> GenerateEAPoLStartFrame(u16 association_id, const NodeInfo& node_info) {
EAPoLStartPacket eapol_start{};
eapol_start.association_id = association_id;
eapol_start.friend_code_seed = node_info.friend_code_seed;
eapol_start.node.friend_code_seed = node_info.friend_code_seed;
for (int i = 0; i < node_info.username.size(); ++i)
eapol_start.username[i] = node_info.username[i];
std::copy(node_info.username.begin(), node_info.username.end(),
eapol_start.node.username.begin());
// Note: The network_node_id and unknown bytes seem to be uninitialized in the NWM module.
// TODO(B3N30): The last 8 bytes seem to have a fixed value of 07 88 15 00 04 e9 13 00 in
@ -295,5 +296,78 @@ std::vector<u8> GenerateEAPoLStartFrame(u16 association_id, const NodeInfo& node
return buffer;
}
EtherType GetFrameEtherType(const std::vector<u8>& frame) {
LLCHeader header;
std::memcpy(&header, frame.data(), sizeof(header));
u16 ethertype = header.protocol;
return static_cast<EtherType>(ethertype);
}
u16 GetEAPoLFrameType(const std::vector<u8>& frame) {
// Ignore the LLC header
u16_be eapol_type;
std::memcpy(&eapol_type, frame.data() + sizeof(LLCHeader), sizeof(eapol_type));
return eapol_type;
}
NodeInfo DeserializeNodeInfoFromFrame(const std::vector<u8>& frame) {
EAPoLStartPacket eapol_start;
// Skip the LLC header
std::memcpy(&eapol_start, frame.data() + sizeof(LLCHeader), sizeof(eapol_start));
NodeInfo node{};
node.friend_code_seed = eapol_start.node.friend_code_seed;
std::copy(eapol_start.node.username.begin(), eapol_start.node.username.end(),
node.username.begin());
return node;
}
NodeInfo DeserializeNodeInfo(const EAPoLNodeInfo& node) {
NodeInfo node_info{};
node_info.friend_code_seed = node.friend_code_seed;
node_info.network_node_id = node.network_node_id;
std::copy(node.username.begin(), node.username.end(), node_info.username.begin());
return node_info;
}
std::vector<u8> GenerateEAPoLLogoffFrame(const MacAddress& mac_address, u16 network_node_id,
const NodeList& nodes, u8 max_nodes, u8 total_nodes) {
EAPoLLogoffPacket eapol_logoff{};
eapol_logoff.assigned_node_id = network_node_id;
eapol_logoff.connected_nodes = total_nodes;
eapol_logoff.max_nodes = max_nodes;
for (size_t index = 0; index < total_nodes; ++index) {
const auto& node_info = nodes[index];
auto& node = eapol_logoff.nodes[index];
node.friend_code_seed = node_info.friend_code_seed;
node.network_node_id = node_info.network_node_id;
std::copy(node_info.username.begin(), node_info.username.end(), node.username.begin());
}
std::vector<u8> eapol_buffer(sizeof(EAPoLLogoffPacket));
std::memcpy(eapol_buffer.data(), &eapol_logoff, sizeof(eapol_logoff));
std::vector<u8> buffer = GenerateLLCHeader(EtherType::EAPoL);
buffer.insert(buffer.end(), eapol_buffer.begin(), eapol_buffer.end());
return buffer;
}
EAPoLLogoffPacket ParseEAPoLLogoffFrame(const std::vector<u8>& frame) {
EAPoLLogoffPacket eapol_logoff;
// Skip the LLC header
std::memcpy(&eapol_logoff, frame.data() + sizeof(LLCHeader), sizeof(eapol_logoff));
return eapol_logoff;
}
} // namespace NWM
} // namespace Service

70
src/core/hle/service/nwm/uds_data.h
View file

@ -8,6 +8,7 @@
#include <vector>
#include "common/common_types.h"
#include "common/swap.h"
#include "core/hle/service/nwm/uds_beacon.h"
#include "core/hle/service/service.h"
namespace Service {
@ -67,6 +68,16 @@ struct DataFrameCryptoCTR {
static_assert(sizeof(DataFrameCryptoCTR) == 16, "DataFrameCryptoCTR has the wrong size");
struct EAPoLNodeInfo {
u64_be friend_code_seed;
std::array<u16_be, 10> username;
INSERT_PADDING_BYTES(4);
u16_be network_node_id;
INSERT_PADDING_BYTES(6);
};
static_assert(sizeof(EAPoLNodeInfo) == 0x28, "EAPoLNodeInfo has the wrong size");
constexpr u16 EAPoLStartMagic = 0x201;
/*
@ -78,16 +89,28 @@ struct EAPoLStartPacket {
// This value is hardcoded to 1 in the NWM module.
u16_be unknown = 1;
INSERT_PADDING_BYTES(2);
u64_be friend_code_seed;
std::array<u16_be, 10> username;
INSERT_PADDING_BYTES(4);
u16_be network_node_id;
INSERT_PADDING_BYTES(6);
EAPoLNodeInfo node;
};
static_assert(sizeof(EAPoLStartPacket) == 0x30, "EAPoLStartPacket has the wrong size");
constexpr u16 EAPoLLogoffMagic = 0x202;
struct EAPoLLogoffPacket {
u16_be magic = EAPoLLogoffMagic;
INSERT_PADDING_BYTES(2);
u16_be assigned_node_id;
MacAddress client_mac_address;
INSERT_PADDING_BYTES(6);
u8 connected_nodes;
u8 max_nodes;
INSERT_PADDING_BYTES(4);
std::array<EAPoLNodeInfo, UDSMaxNodes> nodes;
};
static_assert(sizeof(EAPoLLogoffPacket) == 0x298, "EAPoLLogoffPacket has the wrong size");
/**
* Generates an unencrypted 802.11 data payload.
* @returns The generated frame payload.
@ -102,5 +125,40 @@ std::vector<u8> GenerateDataPayload(const std::vector<u8>& data, u8 channel, u16
*/
std::vector<u8> GenerateEAPoLStartFrame(u16 association_id, const NodeInfo& node_info);
/*
* Returns the EtherType of the specified 802.11 frame.
*/
EtherType GetFrameEtherType(const std::vector<u8>& frame);
/*
* Returns the EAPoL type (Start / Logoff) of the specified 802.11 frame.
* Note: The frame *must* be an EAPoL frame.
*/
u16 GetEAPoLFrameType(const std::vector<u8>& frame);
/*
* Returns a deserialized NodeInfo structure from the information inside an EAPoL-Start packet
* encapsulated in an 802.11 data frame.
*/
NodeInfo DeserializeNodeInfoFromFrame(const std::vector<u8>& frame);
/*
* Returns a NodeInfo constructed from the data in the specified EAPoLNodeInfo.
*/
NodeInfo DeserializeNodeInfo(const EAPoLNodeInfo& node);
/*
* Generates an unencrypted 802.11 data frame body with the EAPoL-Logoff format for UDS
* communication.
* @returns The generated frame body.
*/
std::vector<u8> GenerateEAPoLLogoffFrame(const MacAddress& mac_address, u16 network_node_id,
const NodeList& nodes, u8 max_nodes, u8 total_nodes);
/*
* Returns a EAPoLLogoffPacket representing the specified 802.11-encapsulated data frame.
*/
EAPoLLogoffPacket ParseEAPoLLogoffFrame(const std::vector<u8>& frame);
} // namespace NWM
} // namespace Service