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takion.c
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takion.c
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// SPDX-License-Identifier: LicenseRef-AGPL-3.0-only-OpenSSL
#include "chiaki/feedback.h"
#include <chiaki/takion.h>
#include <chiaki/congestioncontrol.h>
#include <chiaki/random.h>
#include <chiaki/gkcrypt.h>
#include <chiaki/time.h>
#include <fcntl.h>
#include <stdbool.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <assert.h>
#ifdef __APPLE__
#include <CoreServices/CoreServices.h>
#endif
#ifdef _WIN32
#include <ws2tcpip.h>
#elif defined(__SWITCH__)
#include <unistd.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#else
#include <unistd.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <sys/socket.h>
#endif
// VERY similar to SCTP, see RFC 4960
#define TAKION_A_RWND 0x19000
#define TAKION_OUTBOUND_STREAMS 0x64
#define TAKION_INBOUND_STREAMS 0x64
#define TAKION_REORDER_QUEUE_SIZE_EXP 4 // => 16 entries
#define TAKION_SEND_BUFFER_SIZE 16
#define TAKION_POSTPONE_PACKETS_SIZE 32
#define TAKION_MESSAGE_HEADER_SIZE 0x10
#define TAKION_PACKET_BASE_TYPE_MASK 0xf
#define TAKION_EXPECT_TIMEOUT_MS 5000
/**
* Base type of Takion packets. Lower nibble of the first byte in datagrams.
*/
typedef enum takion_packet_type_t {
TAKION_PACKET_TYPE_CONTROL = 0,
TAKION_PACKET_TYPE_FEEDBACK_HISTORY = 1,
TAKION_PACKET_TYPE_VIDEO = 2,
TAKION_PACKET_TYPE_AUDIO = 3,
TAKION_PACKET_TYPE_HANDSHAKE = 4,
TAKION_PACKET_TYPE_CONGESTION = 5,
TAKION_PACKET_TYPE_FEEDBACK_STATE = 6,
TAKION_PACKET_TYPE_CLIENT_INFO = 8,
TAKION_PACKET_TYPE_PAD_INFO_EVENT = 9,
TAKION_PACKET_TYPE_PAD_ADAPTIVE_TRIGGERS = 11,
} TakionPacketType;
/**
* @return The offset of the mac of size CHIAKI_GKCRYPT_GMAC_SIZE inside a packet of type or -1 if unknown.
*/
int takion_packet_type_mac_offset(TakionPacketType type)
{
switch(type)
{
case TAKION_PACKET_TYPE_CONTROL:
return 5;
case TAKION_PACKET_TYPE_VIDEO:
case TAKION_PACKET_TYPE_AUDIO:
return 0xa;
case TAKION_PACKET_TYPE_CONGESTION:
return 7;
default:
return -1;
}
}
/**
* @return The offset of the 4-byte key_pos inside a packet of type or -1 if unknown.
*/
int takion_packet_type_key_pos_offset(TakionPacketType type)
{
switch(type)
{
case TAKION_PACKET_TYPE_CONTROL:
return 0x9;
case TAKION_PACKET_TYPE_VIDEO:
case TAKION_PACKET_TYPE_AUDIO:
return 0xe;
case TAKION_PACKET_TYPE_CONGESTION:
return 0xb;
default:
return -1;
}
}
typedef enum takion_chunk_type_t {
TAKION_CHUNK_TYPE_DATA = 0,
TAKION_CHUNK_TYPE_INIT = 1,
TAKION_CHUNK_TYPE_INIT_ACK = 2,
TAKION_CHUNK_TYPE_DATA_ACK = 3,
TAKION_CHUNK_TYPE_COOKIE = 0xa,
TAKION_CHUNK_TYPE_COOKIE_ACK = 0xb,
} TakionChunkType;
typedef struct takion_message_t
{
uint32_t tag;
//uint8_t zero[4];
uint64_t key_pos;
uint8_t chunk_type;
uint8_t chunk_flags;
uint16_t payload_size;
uint8_t *payload;
} TakionMessage;
typedef struct takion_message_payload_init_t
{
uint32_t tag;
uint32_t a_rwnd;
uint16_t outbound_streams;
uint16_t inbound_streams;
uint32_t initial_seq_num;
} TakionMessagePayloadInit;
#define TAKION_COOKIE_SIZE 0x20
typedef struct takion_message_payload_init_ack_t
{
uint32_t tag;
uint32_t a_rwnd;
uint16_t outbound_streams;
uint16_t inbound_streams;
uint32_t initial_seq_num;
uint8_t cookie[TAKION_COOKIE_SIZE];
} TakionMessagePayloadInitAck;
typedef struct
{
uint8_t *packet_buf;
size_t packet_size;
uint8_t type_b;
uint8_t *payload; // inside packet_buf
size_t payload_size;
uint16_t channel;
} TakionDataPacketEntry;
typedef struct chiaki_takion_postponed_packet_t
{
uint8_t *buf;
size_t buf_size;
} ChiakiTakionPostponedPacket;
static void *takion_thread_func(void *user);
static void takion_handle_packet(ChiakiTakion *takion, uint8_t *buf, size_t buf_size);
static ChiakiErrorCode takion_handle_packet_mac(ChiakiTakion *takion, uint8_t base_type, uint8_t *buf, size_t buf_size);
static void takion_handle_packet_message(ChiakiTakion *takion, uint8_t *buf, size_t buf_size);
static void takion_handle_packet_message_data(ChiakiTakion *takion, uint8_t *packet_buf, size_t packet_buf_size, uint8_t type_b, uint8_t *payload, size_t payload_size);
static void takion_handle_packet_message_data_ack(ChiakiTakion *takion, uint8_t flags, uint8_t *buf, size_t buf_size);
static ChiakiErrorCode takion_parse_message(ChiakiTakion *takion, uint8_t *buf, size_t buf_size, TakionMessage *msg);
static void takion_write_message_header(uint8_t *buf, uint32_t tag, uint64_t key_pos, uint8_t chunk_type, uint8_t chunk_flags, size_t payload_data_size);
static ChiakiErrorCode takion_send_message_init(ChiakiTakion *takion, TakionMessagePayloadInit *payload);
static ChiakiErrorCode takion_send_message_cookie(ChiakiTakion *takion, uint8_t *cookie);
static ChiakiErrorCode takion_recv(ChiakiTakion *takion, uint8_t *buf, size_t *buf_size, uint64_t timeout_ms);
static ChiakiErrorCode takion_recv_message_init_ack(ChiakiTakion *takion, TakionMessagePayloadInitAck *payload);
static ChiakiErrorCode takion_recv_message_cookie_ack(ChiakiTakion *takion);
static void takion_handle_packet_av(ChiakiTakion *takion, uint8_t base_type, uint8_t *buf, size_t buf_size);
static ChiakiErrorCode takion_read_extra_sock_messages(ChiakiTakion *takion);
CHIAKI_EXPORT ChiakiErrorCode chiaki_takion_connect(ChiakiTakion *takion, ChiakiTakionConnectInfo *info, chiaki_socket_t *sock)
{
ChiakiErrorCode ret = CHIAKI_ERR_SUCCESS;
takion->log = info->log;
takion->close_socket = info->close_socket;
takion->version = info->protocol_version;
switch(takion->version)
{
case 7:
takion->av_packet_parse = chiaki_takion_v7_av_packet_parse;
break;
case 9:
takion->av_packet_parse = chiaki_takion_v9_av_packet_parse;
break;
case 12:
takion->av_packet_parse = chiaki_takion_v12_av_packet_parse;
break;
default:
CHIAKI_LOGE(takion->log, "Unknown Takion Protocol Version %u", (unsigned int)takion->version);
return CHIAKI_ERR_INVALID_DATA;
}
takion->gkcrypt_local = NULL;
ret = chiaki_mutex_init(&takion->gkcrypt_local_mutex, true);
if(ret != CHIAKI_ERR_SUCCESS)
return ret;
takion->key_pos_local = 0;
takion->gkcrypt_remote = NULL;
takion->cb = info->cb;
takion->cb_user = info->cb_user;
takion->a_rwnd = TAKION_A_RWND;
takion->tag_local = chiaki_random_32(); // 0x4823
takion->seq_num_local = takion->tag_local;
ret = chiaki_mutex_init(&takion->seq_num_local_mutex, false);
if(ret != CHIAKI_ERR_SUCCESS)
goto error_gkcrypt_local_mutex;
takion->tag_remote = 0;
takion->enable_crypt = info->enable_crypt;
takion->postponed_packets = NULL;
takion->postponed_packets_size = 0;
takion->postponed_packets_count = 0;
takion->enable_dualsense = info->enable_dualsense;
CHIAKI_LOGI(takion->log, "Takion connecting (version %u)", (unsigned int)info->protocol_version);
bool mac_dontfrag = true;
ChiakiErrorCode err = chiaki_stop_pipe_init(&takion->stop_pipe);
if(err != CHIAKI_ERR_SUCCESS)
{
CHIAKI_LOGE(takion->log, "Takion failed to create stop pipe");
goto error_seq_num_local_mutex;
}
if(sock)
{
takion->sock = *sock;
err = takion_read_extra_sock_messages(takion);
if(err != CHIAKI_ERR_SUCCESS && err != CHIAKI_ERR_TIMEOUT)
{
CHIAKI_LOGE(takion->log, "Takion had problem reading extra messages from socket using PSN Connection with error: " CHIAKI_SOCKET_ERROR_FMT, CHIAKI_SOCKET_ERROR_VALUE);
goto error_sock;
}
const int rcvbuf_val = takion->a_rwnd;
int r = setsockopt(takion->sock, SOL_SOCKET, SO_RCVBUF, (const CHIAKI_SOCKET_BUF_TYPE)&rcvbuf_val, sizeof(rcvbuf_val));
if(r < 0)
{
CHIAKI_LOGE(takion->log, "Takion failed to setsockopt SO_RCVBUF: " CHIAKI_SOCKET_ERROR_FMT, CHIAKI_SOCKET_ERROR_VALUE);
ret = CHIAKI_ERR_NETWORK;
goto error_sock;
}
#if defined(__APPLE__)
SInt32 majorVersion;
Gestalt(gestaltSystemVersionMajor, &majorVersion);
if(majorVersion < 11)
{
mac_dontfrag = false;
}
#endif
if(info->ip_dontfrag)
{
#if defined(_WIN32)
const DWORD dontfragment_val = 1;
r = setsockopt(takion->sock, IPPROTO_IP, IP_DONTFRAGMENT, (const CHIAKI_SOCKET_BUF_TYPE)&dontfragment_val, sizeof(dontfragment_val));
#elif defined(__FreeBSD__) || defined(__SWITCH__) || defined(__APPLE__)
if(mac_dontfrag)
{
const int dontfrag_val = 1;
r = setsockopt(takion->sock, IPPROTO_IP, IP_DONTFRAG, (const CHIAKI_SOCKET_BUF_TYPE)&dontfrag_val, sizeof(dontfrag_val));
}
else
CHIAKI_LOGW(takion->log, "Don't fragment is not supported on this platform, MTU values may be incorrect.");
#elif defined(IP_PMTUDISC_DO)
const int mtu_discover_val = IP_PMTUDISC_DO;
r = setsockopt(takion->sock, IPPROTO_IP, IP_MTU_DISCOVER, (const CHIAKI_SOCKET_BUF_TYPE)&mtu_discover_val, sizeof(mtu_discover_val));
#else
// macOS older than MacOS Big Sur (11) and OpenBSD
CHIAKI_LOGW(takion->log, "Don't fragment is not supported on this platform, MTU values may be incorrect.");
#define NO_DONTFRAG
#endif
#ifndef NO_DONTFRAG
if(r < 0 && mac_dontfrag)
{
CHIAKI_LOGE(takion->log, "Takion failed to setsockopt IP_MTU_DISCOVER: " CHIAKI_SOCKET_ERROR_FMT, CHIAKI_SOCKET_ERROR_VALUE);
ret = CHIAKI_ERR_NETWORK;
goto error_sock;
}
CHIAKI_LOGI(takion->log, "Takion enabled Don't Fragment Bit");
#endif
}
else
{
#if defined(_WIN32)
const DWORD dontfragment_val = 0;
r = setsockopt(takion->sock, IPPROTO_IP, IP_DONTFRAGMENT, (const CHIAKI_SOCKET_BUF_TYPE)&dontfragment_val, sizeof(dontfragment_val));
#elif defined(__FreeBSD__) || defined(__SWITCH__) || defined(__APPLE__)
if(mac_dontfrag)
{
const int dontfrag_val = 0;
r = setsockopt(takion->sock, IPPROTO_IP, IP_DONTFRAG, (const CHIAKI_SOCKET_BUF_TYPE)&dontfrag_val, sizeof(dontfrag_val));
}
#elif defined(IP_PMTUDISC_DO)
const int mtu_discover_val = IP_PMTUDISC_DONT;
r = setsockopt(takion->sock, IPPROTO_IP, IP_MTU_DISCOVER, (const CHIAKI_SOCKET_BUF_TYPE)&mtu_discover_val, sizeof(mtu_discover_val));
#else
// macOS older than MacOS Big Sur (11) and OpenBSD
#define NO_DONTFRAG
#endif
#ifndef NO_DONTFRAG
if(r < 0 && mac_dontfrag)
{
CHIAKI_LOGE(takion->log, "Takion failed to unset setsockopt IP_MTU_DISCOVER: " CHIAKI_SOCKET_ERROR_FMT, CHIAKI_SOCKET_ERROR_VALUE);
ret = CHIAKI_ERR_NETWORK;
goto error_sock;
}
CHIAKI_LOGI(takion->log, "Takion disabled Don't Fragment Bit");
#endif
}
}
else
{
takion->sock = socket(info->sa->sa_family, SOCK_DGRAM, IPPROTO_UDP);
if(CHIAKI_SOCKET_IS_INVALID(takion->sock))
{
CHIAKI_LOGE(takion->log, "Takion failed to create socket");
ret = CHIAKI_ERR_NETWORK;
goto error_pipe;
}
const int rcvbuf_val = takion->a_rwnd;
int r = setsockopt(takion->sock, SOL_SOCKET, SO_RCVBUF, (const CHIAKI_SOCKET_BUF_TYPE)&rcvbuf_val, sizeof(rcvbuf_val));
if(r < 0)
{
CHIAKI_LOGE(takion->log, "Takion failed to setsockopt SO_RCVBUF: " CHIAKI_SOCKET_ERROR_FMT, CHIAKI_SOCKET_ERROR_VALUE);
ret = CHIAKI_ERR_NETWORK;
goto error_sock;
}
if(info->ip_dontfrag)
{
#if defined(__APPLE__)
SInt32 majorVersion;
Gestalt(gestaltSystemVersionMajor, &majorVersion);
if(majorVersion < 11)
{
mac_dontfrag = false;
}
#endif
#if defined(_WIN32)
const DWORD dontfragment_val = 1;
r = setsockopt(takion->sock, IPPROTO_IP, IP_DONTFRAGMENT, (const CHIAKI_SOCKET_BUF_TYPE)&dontfragment_val, sizeof(dontfragment_val));
#elif defined(__FreeBSD__) || defined(__SWITCH__) || defined(__APPLE__)
const int dontfrag_val = 1;
r = setsockopt(takion->sock, IPPROTO_IP, IP_DONTFRAG, (const CHIAKI_SOCKET_BUF_TYPE)&dontfrag_val, sizeof(dontfrag_val));
#elif defined(IP_PMTUDISC_DO)
if(mac_dontfrag)
{
const int mtu_discover_val = IP_PMTUDISC_DO;
r = setsockopt(takion->sock, IPPROTO_IP, IP_MTU_DISCOVER, (const CHIAKI_SOCKET_BUF_TYPE)&mtu_discover_val, sizeof(mtu_discover_val));
}
else
CHIAKI_LOGW(takion->log, "Don't fragment is not supported on this platform, MTU values may be incorrect.");
#else
// macOS older than MacOS Big Sur (11) and OpenBSD
CHIAKI_LOGW(takion->log, "Don't fragment is not supported on this platform, MTU values may be incorrect.");
#define NO_DONTFRAG
#endif
#ifndef NO_DONTFRAG
if(r < 0 && mac_dontfrag)
{
CHIAKI_LOGE(takion->log, "Takion failed to setsockopt IP_MTU_DISCOVER: " CHIAKI_SOCKET_ERROR_FMT, CHIAKI_SOCKET_ERROR_VALUE);
ret = CHIAKI_ERR_NETWORK;
goto error_sock;
}
CHIAKI_LOGI(takion->log, "Takion enabled Don't Fragment Bit");
#endif
}
r = connect(takion->sock, info->sa, info->sa_len);
if(r < 0)
{
CHIAKI_LOGE(takion->log, "Takion failed to connect: " CHIAKI_SOCKET_ERROR_FMT, CHIAKI_SOCKET_ERROR_VALUE);
ret = CHIAKI_ERR_NETWORK;
goto error_sock;
}
if(r != CHIAKI_ERR_SUCCESS)
{
ret = err;
goto error_sock;
}
}
err = chiaki_thread_create(&takion->thread, takion_thread_func, takion);
chiaki_thread_set_name(&takion->thread, "Chiaki Takion");
return CHIAKI_ERR_SUCCESS;
error_sock:
if(!CHIAKI_SOCKET_IS_INVALID(takion->sock))
{
CHIAKI_SOCKET_CLOSE(takion->sock);
takion->sock = CHIAKI_INVALID_SOCKET;
}
error_pipe:
chiaki_stop_pipe_fini(&takion->stop_pipe);
error_seq_num_local_mutex:
chiaki_mutex_fini(&takion->seq_num_local_mutex);
error_gkcrypt_local_mutex:
chiaki_mutex_fini(&takion->gkcrypt_local_mutex);
return ret;
}
CHIAKI_EXPORT void chiaki_takion_close(ChiakiTakion *takion)
{
chiaki_stop_pipe_stop(&takion->stop_pipe);
chiaki_thread_join(&takion->thread, NULL);
chiaki_stop_pipe_fini(&takion->stop_pipe);
chiaki_mutex_fini(&takion->seq_num_local_mutex);
chiaki_mutex_fini(&takion->gkcrypt_local_mutex);
}
CHIAKI_EXPORT ChiakiErrorCode chiaki_takion_crypt_advance_key_pos(ChiakiTakion *takion, size_t data_size, uint64_t *key_pos)
{
data_size += data_size % CHIAKI_GKCRYPT_BLOCK_SIZE;
ChiakiErrorCode err = chiaki_mutex_lock(&takion->gkcrypt_local_mutex);
if(err != CHIAKI_ERR_SUCCESS)
return err;
if(takion->gkcrypt_local)
{
uint64_t cur = takion->key_pos_local;
if(SIZE_MAX - cur < data_size)
{
chiaki_mutex_unlock(&takion->gkcrypt_local_mutex);
return CHIAKI_ERR_OVERFLOW;
}
*key_pos = cur;
takion->key_pos_local = cur + data_size;
}
else
*key_pos = 0;
chiaki_mutex_unlock(&takion->gkcrypt_local_mutex);
return CHIAKI_ERR_SUCCESS;
}
CHIAKI_EXPORT ChiakiErrorCode chiaki_takion_send_raw(ChiakiTakion *takion, const uint8_t *buf, size_t buf_size)
{
int r = send(takion->sock, buf, buf_size, 0);
if(r < 0)
{
CHIAKI_LOGE(takion->log, "Takion failed to send raw: " CHIAKI_SOCKET_ERROR_FMT, CHIAKI_SOCKET_ERROR_VALUE);
return CHIAKI_ERR_NETWORK;
}
return CHIAKI_ERR_SUCCESS;
}
static ChiakiErrorCode chiaki_takion_packet_read_key_pos(ChiakiTakion *takion, uint8_t *buf, size_t buf_size, uint64_t *key_pos_out)
{
if(buf_size < 1)
return CHIAKI_ERR_BUF_TOO_SMALL;
TakionPacketType base_type = buf[0] & TAKION_PACKET_BASE_TYPE_MASK;
int key_pos_offset = takion_packet_type_key_pos_offset(base_type);
if(key_pos_offset < 0)
return CHIAKI_ERR_INVALID_DATA;
if(buf_size < key_pos_offset + sizeof(uint32_t))
return CHIAKI_ERR_BUF_TOO_SMALL;
uint32_t key_pos_low = ntohl(*((chiaki_unaligned_uint32_t *)(buf + key_pos_offset)));
*key_pos_out = chiaki_key_state_request_pos(&takion->key_state, key_pos_low, false);
return CHIAKI_ERR_SUCCESS;
}
CHIAKI_EXPORT ChiakiErrorCode chiaki_takion_packet_mac(ChiakiGKCrypt *crypt, uint8_t *buf, size_t buf_size, uint64_t key_pos, uint8_t *mac_out, uint8_t *mac_old_out)
{
if(buf_size < 1)
return CHIAKI_ERR_BUF_TOO_SMALL;
TakionPacketType base_type = buf[0] & TAKION_PACKET_BASE_TYPE_MASK;
int mac_offset = takion_packet_type_mac_offset(base_type);
int key_pos_offset = takion_packet_type_key_pos_offset(base_type);
if(mac_offset < 0 || key_pos_offset < 0)
return CHIAKI_ERR_INVALID_DATA;
if(buf_size < mac_offset + CHIAKI_GKCRYPT_GMAC_SIZE || buf_size < key_pos_offset + sizeof(uint32_t))
return CHIAKI_ERR_BUF_TOO_SMALL;
if(mac_old_out)
memcpy(mac_old_out, buf + mac_offset, CHIAKI_GKCRYPT_GMAC_SIZE);
memset(buf + mac_offset, 0, CHIAKI_GKCRYPT_GMAC_SIZE);
if(crypt)
{
uint8_t key_pos_tmp[sizeof(uint32_t)];
if(base_type == TAKION_PACKET_TYPE_CONTROL || base_type == TAKION_PACKET_TYPE_CONGESTION)
{
memcpy(key_pos_tmp, buf + key_pos_offset, sizeof(uint32_t));
memset(buf + key_pos_offset, 0, sizeof(uint32_t));
}
chiaki_gkcrypt_gmac(crypt, key_pos, buf, buf_size, buf + mac_offset);
if(base_type == TAKION_PACKET_TYPE_CONTROL || base_type == TAKION_PACKET_TYPE_CONGESTION)
memcpy(buf + key_pos_offset, key_pos_tmp, sizeof(uint32_t));
}
if(mac_out)
memcpy(mac_out, buf + mac_offset, CHIAKI_GKCRYPT_GMAC_SIZE);
return CHIAKI_ERR_SUCCESS;
}
CHIAKI_EXPORT ChiakiErrorCode chiaki_takion_send(ChiakiTakion *takion, uint8_t *buf, size_t buf_size, uint64_t key_pos)
{
ChiakiErrorCode err = chiaki_mutex_lock(&takion->gkcrypt_local_mutex);
if(err != CHIAKI_ERR_SUCCESS)
return err;
uint8_t mac[CHIAKI_GKCRYPT_GMAC_SIZE];
err = chiaki_takion_packet_mac(takion->gkcrypt_local, buf, buf_size, key_pos, mac, NULL);
chiaki_mutex_unlock(&takion->gkcrypt_local_mutex);
if(err != CHIAKI_ERR_SUCCESS)
return err;
//CHIAKI_LOGD(takion->log, "Takion sending:");
//chiaki_log_hexdump(takion->log, CHIAKI_LOG_DEBUG, buf, buf_size);
return chiaki_takion_send_raw(takion, buf, buf_size);
}
CHIAKI_EXPORT ChiakiErrorCode chiaki_takion_send_message_data(ChiakiTakion *takion, uint8_t chunk_flags, uint16_t channel, uint8_t *buf, size_t buf_size, ChiakiSeqNum32 *seq_num)
{
// TODO: can we make this more memory-efficient?
// TODO: split packet if necessary?
uint64_t key_pos;
ChiakiErrorCode err = chiaki_takion_crypt_advance_key_pos(takion, buf_size, &key_pos);
if(err != CHIAKI_ERR_SUCCESS)
return err;
size_t packet_size = 1 + TAKION_MESSAGE_HEADER_SIZE + 9 + buf_size;
uint8_t *packet_buf = malloc(packet_size);
if(!packet_buf)
return CHIAKI_ERR_MEMORY;
packet_buf[0] = TAKION_PACKET_TYPE_CONTROL;
takion_write_message_header(packet_buf + 1, takion->tag_remote, key_pos, TAKION_CHUNK_TYPE_DATA, chunk_flags, 9 + buf_size);
uint8_t *msg_payload = packet_buf + 1 + TAKION_MESSAGE_HEADER_SIZE;
err = chiaki_mutex_lock(&takion->seq_num_local_mutex);
if(err != CHIAKI_ERR_SUCCESS)
return err;
ChiakiSeqNum32 seq_num_val = takion->seq_num_local++;
chiaki_mutex_unlock(&takion->seq_num_local_mutex);
*((chiaki_unaligned_uint32_t *)(msg_payload + 0)) = htonl(seq_num_val);
*((chiaki_unaligned_uint16_t *)(msg_payload + 4)) = htons(channel);
*((chiaki_unaligned_uint16_t *)(msg_payload + 6)) = 0;
*(msg_payload + 8) = 0;
memcpy(msg_payload + 9, buf, buf_size);
err = chiaki_takion_send(takion, packet_buf, packet_size, key_pos); // will alter packet_buf with gmac
if(err != CHIAKI_ERR_SUCCESS)
{
CHIAKI_LOGE(takion->log, "Takion failed to send data packet: %s", chiaki_error_string(err));
free(packet_buf);
return err;
}
chiaki_takion_send_buffer_push(&takion->send_buffer, seq_num_val, packet_buf, packet_size);
if(seq_num)
*seq_num = seq_num_val;
return err;
}
CHIAKI_EXPORT ChiakiErrorCode chiaki_takion_send_message_data_cont(ChiakiTakion *takion, uint8_t chunk_flags, uint16_t channel, uint8_t *buf, size_t buf_size, ChiakiSeqNum32 *seq_num)
{
// TODO: can we make this more memory-efficient?
// TODO: split packet if necessary?
uint64_t key_pos;
ChiakiErrorCode err = chiaki_takion_crypt_advance_key_pos(takion, buf_size, &key_pos);
if(err != CHIAKI_ERR_SUCCESS)
return err;
size_t packet_size = 1 + TAKION_MESSAGE_HEADER_SIZE + 8 + buf_size;
uint8_t *packet_buf = malloc(packet_size);
if(!packet_buf)
return CHIAKI_ERR_MEMORY;
packet_buf[0] = TAKION_PACKET_TYPE_CONTROL;
takion_write_message_header(packet_buf + 1, takion->tag_remote, key_pos, TAKION_CHUNK_TYPE_DATA, chunk_flags, 8 + buf_size);
uint8_t *msg_payload = packet_buf + 1 + TAKION_MESSAGE_HEADER_SIZE;
err = chiaki_mutex_lock(&takion->seq_num_local_mutex);
if(err != CHIAKI_ERR_SUCCESS)
return err;
ChiakiSeqNum32 seq_num_val = takion->seq_num_local++;
chiaki_mutex_unlock(&takion->seq_num_local_mutex);
*((chiaki_unaligned_uint32_t *)(msg_payload + 0)) = htonl(seq_num_val);
*((chiaki_unaligned_uint16_t *)(msg_payload + 4)) = htons(channel);
*((chiaki_unaligned_uint16_t *)(msg_payload + 6)) = 0;
memcpy(msg_payload + 8, buf, buf_size);
err = chiaki_takion_send(takion, packet_buf, packet_size, key_pos); // will alter packet_buf with gmac
if(err != CHIAKI_ERR_SUCCESS)
{
CHIAKI_LOGE(takion->log, "Takion failed to send data packet: %s", chiaki_error_string(err));
free(packet_buf);
return err;
}
chiaki_takion_send_buffer_push(&takion->send_buffer, seq_num_val, packet_buf, packet_size);
if(seq_num)
*seq_num = seq_num_val;
return err;
}
static ChiakiErrorCode chiaki_takion_send_message_data_ack(ChiakiTakion *takion, uint32_t seq_num)
{
uint8_t buf[1 + TAKION_MESSAGE_HEADER_SIZE + 0xc];
buf[0] = TAKION_PACKET_TYPE_CONTROL;
uint64_t key_pos;
ChiakiErrorCode err = chiaki_takion_crypt_advance_key_pos(takion, sizeof(buf), &key_pos);
if(err != CHIAKI_ERR_SUCCESS)
return err;
takion_write_message_header(buf + 1, takion->tag_remote, key_pos, TAKION_CHUNK_TYPE_DATA_ACK, 0, 0xc);
uint8_t *data_ack = buf + 1 + TAKION_MESSAGE_HEADER_SIZE;
*((chiaki_unaligned_uint32_t *)(data_ack + 0)) = htonl(seq_num);
*((chiaki_unaligned_uint32_t *)(data_ack + 4)) = htonl(takion->a_rwnd);
*((chiaki_unaligned_uint16_t *)(data_ack + 8)) = 0;
*((chiaki_unaligned_uint16_t *)(data_ack + 0xa)) = 0;
return chiaki_takion_send(takion, buf, sizeof(buf), key_pos);
}
CHIAKI_EXPORT void chiaki_takion_format_congestion(uint8_t *buf, ChiakiTakionCongestionPacket *packet, uint64_t key_pos)
{
buf[0] = TAKION_PACKET_TYPE_CONGESTION;
*((chiaki_unaligned_uint16_t *)(buf + 1)) = htons(packet->word_0);
*((chiaki_unaligned_uint16_t *)(buf + 3)) = htons(packet->received);
*((chiaki_unaligned_uint16_t *)(buf + 5)) = htons(packet->lost);
*((chiaki_unaligned_uint32_t *)(buf + 7)) = 0;
*((chiaki_unaligned_uint32_t *)(buf + 0xb)) = htonl((uint32_t)key_pos);
}
CHIAKI_EXPORT ChiakiErrorCode chiaki_takion_send_congestion(ChiakiTakion *takion, ChiakiTakionCongestionPacket *packet)
{
uint64_t key_pos;
ChiakiErrorCode err = chiaki_takion_crypt_advance_key_pos(takion, CHIAKI_TAKION_CONGESTION_PACKET_SIZE, &key_pos);
if(err != CHIAKI_ERR_SUCCESS)
return err;
uint8_t buf[CHIAKI_TAKION_CONGESTION_PACKET_SIZE];
chiaki_takion_format_congestion(buf, packet, key_pos);
return chiaki_takion_send(takion, buf, sizeof(buf), key_pos);
}
static ChiakiErrorCode takion_send_feedback_packet(ChiakiTakion *takion, uint8_t *buf, size_t buf_size)
{
assert(buf_size >= 0xc);
size_t payload_size = buf_size - 0xc;
ChiakiErrorCode err = chiaki_mutex_lock(&takion->gkcrypt_local_mutex);
if(err != CHIAKI_ERR_SUCCESS)
return err;
uint64_t key_pos;
err = chiaki_takion_crypt_advance_key_pos(takion, payload_size + CHIAKI_GKCRYPT_BLOCK_SIZE, &key_pos);
if(err != CHIAKI_ERR_SUCCESS)
goto beach;
err = chiaki_gkcrypt_encrypt(takion->gkcrypt_local, key_pos + CHIAKI_GKCRYPT_BLOCK_SIZE, buf + 0xc, payload_size);
if(err != CHIAKI_ERR_SUCCESS)
goto beach;
*((chiaki_unaligned_uint32_t *)(buf + 4)) = htonl((uint32_t)key_pos);
err = chiaki_gkcrypt_gmac(takion->gkcrypt_local, key_pos, buf, buf_size, buf + 8);
if(err != CHIAKI_ERR_SUCCESS)
goto beach;
chiaki_takion_send_raw(takion, buf, buf_size);
beach:
chiaki_mutex_unlock(&takion->gkcrypt_local_mutex);
return err;
}
CHIAKI_EXPORT ChiakiErrorCode chiaki_takion_send_feedback_state(ChiakiTakion *takion, ChiakiSeqNum16 seq_num, ChiakiFeedbackState *feedback_state)
{
uint8_t buf[0xc + CHIAKI_FEEDBACK_STATE_BUF_SIZE_MAX];
buf[0] = TAKION_PACKET_TYPE_FEEDBACK_STATE;
*((chiaki_unaligned_uint16_t *)(buf + 1)) = htons(seq_num);
buf[3] = 0; // TODO
*((chiaki_unaligned_uint32_t *)(buf + 4)) = 0; // key pos
*((chiaki_unaligned_uint32_t *)(buf + 8)) = 0; // gmac
size_t buf_sz;
if(takion->version <= 9)
{
buf_sz = 0xc + CHIAKI_FEEDBACK_STATE_BUF_SIZE_V9;
chiaki_feedback_state_format_v9(buf + 0xc, feedback_state);
}
else
{
buf_sz = 0xc + CHIAKI_FEEDBACK_STATE_BUF_SIZE_V12;
chiaki_feedback_state_format_v12(buf + 0xc, feedback_state);
}
return takion_send_feedback_packet(takion, buf, buf_sz);
}
CHIAKI_EXPORT ChiakiErrorCode chiaki_takion_send_mic_packet(ChiakiTakion *takion, uint8_t *buf, size_t buf_size, bool ps5)
{
uint8_t ps5_packet = 0;
if(ps5)
ps5_packet = 1;
size_t payload_size = buf_size - 19 - ps5_packet;
ChiakiErrorCode err = chiaki_mutex_lock(&takion->gkcrypt_local_mutex);
if(err != CHIAKI_ERR_SUCCESS)
return err;
uint64_t key_pos;
err = chiaki_takion_crypt_advance_key_pos(takion, payload_size + CHIAKI_GKCRYPT_BLOCK_SIZE, &key_pos);
if(err != CHIAKI_ERR_SUCCESS)
goto beach;
err = chiaki_gkcrypt_encrypt(takion->gkcrypt_local, key_pos + CHIAKI_GKCRYPT_BLOCK_SIZE, buf + 19 + ps5_packet, payload_size);
if(err != CHIAKI_ERR_SUCCESS)
goto beach;
*((chiaki_unaligned_uint32_t *)(buf + 14)) = htonl((uint32_t)key_pos);
err = chiaki_gkcrypt_gmac(takion->gkcrypt_local, key_pos, buf, buf_size, buf + 10);
if(err != CHIAKI_ERR_SUCCESS)
goto beach;
chiaki_takion_send_raw(takion, buf, buf_size);
beach:
chiaki_mutex_unlock(&takion->gkcrypt_local_mutex);
return err;
}
CHIAKI_EXPORT ChiakiErrorCode chiaki_takion_send_feedback_history(ChiakiTakion *takion, ChiakiSeqNum16 seq_num, uint8_t *payload, size_t payload_size)
{
size_t buf_size = 0xc + payload_size;
uint8_t *buf = malloc(buf_size);
if(!buf)
return CHIAKI_ERR_MEMORY;
buf[0] = TAKION_PACKET_TYPE_FEEDBACK_HISTORY;
*((chiaki_unaligned_uint16_t *)(buf + 1)) = htons(seq_num);
buf[3] = 0; // TODO
*((chiaki_unaligned_uint32_t *)(buf + 4)) = 0; // key pos
*((chiaki_unaligned_uint32_t *)(buf + 8)) = 0; // gmac
memcpy(buf + 0xc, payload, payload_size);
ChiakiErrorCode err = takion_send_feedback_packet(takion, buf, buf_size);
free(buf);
return err;
}
static ChiakiErrorCode takion_handshake(ChiakiTakion *takion, uint32_t *seq_num_remote_initial)
{
ChiakiErrorCode err;
// INIT ->
TakionMessagePayloadInit init_payload;
init_payload.tag = takion->tag_local;
init_payload.a_rwnd = TAKION_A_RWND;
init_payload.outbound_streams = TAKION_OUTBOUND_STREAMS;
init_payload.inbound_streams = TAKION_INBOUND_STREAMS;
init_payload.initial_seq_num = takion->seq_num_local;
err = takion_send_message_init(takion, &init_payload);
if(err != CHIAKI_ERR_SUCCESS)
{
CHIAKI_LOGE(takion->log, "Takion failed to send init");
return err;
}
CHIAKI_LOGI(takion->log, "Takion sent init");
// INIT_ACK <-
TakionMessagePayloadInitAck init_ack_payload;
err = takion_recv_message_init_ack(takion, &init_ack_payload);
if(err != CHIAKI_ERR_SUCCESS)
{
CHIAKI_LOGE(takion->log, "Takion failed to receive init ack");
return err;
}
if(init_ack_payload.tag == 0)
{
CHIAKI_LOGE(takion->log, "Takion remote tag in init ack is 0");
return CHIAKI_ERR_INVALID_RESPONSE;
}
CHIAKI_LOGI(takion->log, "Takion received init ack with remote tag %#x, outbound streams: %#x, inbound streams: %#x",
init_ack_payload.tag, init_ack_payload.outbound_streams, init_ack_payload.inbound_streams);
takion->tag_remote = init_ack_payload.tag;
*seq_num_remote_initial = takion->tag_remote; //init_ack_payload.initial_seq_num;
if(init_ack_payload.outbound_streams == 0 || init_ack_payload.inbound_streams == 0 || init_ack_payload.outbound_streams > TAKION_INBOUND_STREAMS || init_ack_payload.inbound_streams < TAKION_OUTBOUND_STREAMS)
{
CHIAKI_LOGE(takion->log, "Takion min/max check failed");
return CHIAKI_ERR_INVALID_RESPONSE;
}
// COOKIE ->
err = takion_send_message_cookie(takion, init_ack_payload.cookie);
if(err != CHIAKI_ERR_SUCCESS)
{
CHIAKI_LOGE(takion->log, "Takion failed to send cookie");
return err;
}
CHIAKI_LOGI(takion->log, "Takion sent cookie");
// COOKIE_ACK <-
err = takion_recv_message_cookie_ack(takion);
if(err != CHIAKI_ERR_SUCCESS)
{
CHIAKI_LOGE(takion->log, "Takion failed to receive cookie ack");
return err;
}
CHIAKI_LOGI(takion->log, "Takion received cookie ack");
// done!
CHIAKI_LOGI(takion->log, "Takion connected");
return CHIAKI_ERR_SUCCESS;
}
static void takion_data_drop(uint64_t seq_num, void *elem_user, void *cb_user)
{
ChiakiTakion *takion = cb_user;
CHIAKI_LOGE(takion->log, "Takion dropping data with seq num %#llx", (unsigned long long)seq_num);
TakionDataPacketEntry *entry = elem_user;
free(entry->packet_buf);
free(entry);
}
static void *takion_thread_func(void *user)
{
ChiakiTakion *takion = user;
uint32_t seq_num_remote_initial;
if(takion_handshake(takion, &seq_num_remote_initial) != CHIAKI_ERR_SUCCESS)
goto beach;
if(chiaki_reorder_queue_init_32(&takion->data_queue, TAKION_REORDER_QUEUE_SIZE_EXP, seq_num_remote_initial) != CHIAKI_ERR_SUCCESS)
goto beach;
chiaki_reorder_queue_set_drop_cb(&takion->data_queue, takion_data_drop, takion);
// The send buffer size MUST be consistent with the acked seqnums array size in takion_handle_packet_message_data_ack()
if(chiaki_takion_send_buffer_init(&takion->send_buffer, takion, TAKION_SEND_BUFFER_SIZE) != CHIAKI_ERR_SUCCESS)
goto error_reoder_queue;
if(takion->cb)
{
ChiakiTakionEvent event = { 0 };
event.type = CHIAKI_TAKION_EVENT_TYPE_CONNECTED;
takion->cb(&event, takion->cb_user);
}
bool crypt_available = takion->gkcrypt_remote ? true : false;
while(true)
{
if(takion->enable_crypt && !crypt_available && takion->gkcrypt_remote)
{
crypt_available = true;
CHIAKI_LOGI(takion->log, "Crypt has become available. Re-checking MACs of %llu packets", (unsigned long long)chiaki_reorder_queue_count(&takion->data_queue));
for(uint64_t i=0; i<chiaki_reorder_queue_count(&takion->data_queue); i++)
{
TakionDataPacketEntry *packet;
bool peeked = chiaki_reorder_queue_peek(&takion->data_queue, i, NULL, (void **)&packet);
if(!peeked)
continue;
if(packet->packet_size == 0)
continue;
uint8_t base_type = (uint8_t)(packet->packet_buf[0] & TAKION_PACKET_BASE_TYPE_MASK);
if(takion_handle_packet_mac(takion, base_type, packet->packet_buf, packet->packet_size) != CHIAKI_ERR_SUCCESS)
{
CHIAKI_LOGW(takion->log, "Found an invalid MAC");
chiaki_reorder_queue_drop(&takion->data_queue, i);
}
}
}
if(takion->postponed_packets && takion->gkcrypt_remote)
{
// there are some postponed packets that were waiting until crypt is initialized and it is now :-)
CHIAKI_LOGI(takion->log, "Takion flushing %llu postpone packet(s)", (unsigned long long)takion->postponed_packets_count);
for(size_t i=0; i<takion->postponed_packets_count; i++)
{
ChiakiTakionPostponedPacket *packet = &takion->postponed_packets[i];
takion_handle_packet(takion, packet->buf, packet->buf_size);
}
free(takion->postponed_packets);
takion->postponed_packets = NULL;
takion->postponed_packets_size = 0;
takion->postponed_packets_count = 0;
}
size_t received_size = 1500;
uint8_t *buf = malloc(received_size); // TODO: no malloc?
if(!buf)
break;
ChiakiErrorCode err = takion_recv(takion, buf, &received_size, UINT64_MAX);
if(err != CHIAKI_ERR_SUCCESS)
{
free(buf);
break;
}
uint8_t *resized_buf = realloc(buf, received_size);
if(!resized_buf)
{
free(buf);
continue;
}
takion_handle_packet(takion, resized_buf, received_size);
}
chiaki_takion_send_buffer_fini(&takion->send_buffer);
error_reoder_queue:
chiaki_reorder_queue_fini(&takion->data_queue);
beach:
if(takion->cb)
{
ChiakiTakionEvent event = { 0 };
event.type = CHIAKI_TAKION_EVENT_TYPE_DISCONNECT;
takion->cb(&event, takion->cb_user);
}
if(takion->close_socket)
{
if(!CHIAKI_SOCKET_IS_INVALID(takion->sock))
{
CHIAKI_SOCKET_CLOSE(takion->sock);
takion->sock = CHIAKI_INVALID_SOCKET;
}
}
return NULL;
}
static ChiakiErrorCode takion_recv(ChiakiTakion *takion, uint8_t *buf, size_t *buf_size, uint64_t timeout_ms)
{
ChiakiErrorCode err = chiaki_stop_pipe_select_single(&takion->stop_pipe, takion->sock, false, timeout_ms);
if(err == CHIAKI_ERR_TIMEOUT || err == CHIAKI_ERR_CANCELED)
return err;
if(err != CHIAKI_ERR_SUCCESS)
{
CHIAKI_LOGE(takion->log, "Takion select failed: " CHIAKI_SOCKET_ERROR_FMT, CHIAKI_SOCKET_ERROR_VALUE);
return err;
}
int received_sz = recv(takion->sock, buf, *buf_size, 0);
if(received_sz <= 0)
{
if(received_sz < 0)
CHIAKI_LOGE(takion->log, "Takion recv failed: " CHIAKI_SOCKET_ERROR_FMT, CHIAKI_SOCKET_ERROR_VALUE);
else
CHIAKI_LOGE(takion->log, "Takion recv returned 0");
return CHIAKI_ERR_NETWORK;
}
*buf_size = (size_t)received_sz;
return CHIAKI_ERR_SUCCESS;