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sys_net.cpp
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sys_net.cpp
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#include "stdafx.h"
#include "sys_net.h"
#include "Emu/IdManager.h"
#include "Emu/Cell/PPUThread.h"
#include "Utilities/Thread.h"
#include "sys_sync.h"
#ifdef _WIN32
#include <winsock2.h>
#include <WS2tcpip.h>
#else
#ifdef __clang__
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wold-style-cast"
#endif
#include <errno.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <fcntl.h>
#include <poll.h>
#ifdef __clang__
#pragma GCC diagnostic pop
#endif
#endif
#include "Emu/NP/np_handler.h"
#include "Emu/NP/np_helpers.h"
#include "Emu/NP/np_dnshook.h"
#include <chrono>
#include <shared_mutex>
LOG_CHANNEL(sys_net);
LOG_CHANNEL(sys_net_dump);
template<>
void fmt_class_string<sys_net_error>::format(std::string& out, u64 arg)
{
format_enum(out, arg, [](auto error)
{
switch (s32 _error = error)
{
#define SYS_NET_ERROR_CASE(x) case -x: return "-" #x; case x: return #x
SYS_NET_ERROR_CASE(SYS_NET_ENOENT);
SYS_NET_ERROR_CASE(SYS_NET_EINTR);
SYS_NET_ERROR_CASE(SYS_NET_EBADF);
SYS_NET_ERROR_CASE(SYS_NET_ENOMEM);
SYS_NET_ERROR_CASE(SYS_NET_EACCES);
SYS_NET_ERROR_CASE(SYS_NET_EFAULT);
SYS_NET_ERROR_CASE(SYS_NET_EBUSY);
SYS_NET_ERROR_CASE(SYS_NET_EINVAL);
SYS_NET_ERROR_CASE(SYS_NET_EMFILE);
SYS_NET_ERROR_CASE(SYS_NET_ENOSPC);
SYS_NET_ERROR_CASE(SYS_NET_EPIPE);
SYS_NET_ERROR_CASE(SYS_NET_EAGAIN);
static_assert(SYS_NET_EWOULDBLOCK == SYS_NET_EAGAIN);
SYS_NET_ERROR_CASE(SYS_NET_EINPROGRESS);
SYS_NET_ERROR_CASE(SYS_NET_EALREADY);
SYS_NET_ERROR_CASE(SYS_NET_EDESTADDRREQ);
SYS_NET_ERROR_CASE(SYS_NET_EMSGSIZE);
SYS_NET_ERROR_CASE(SYS_NET_EPROTOTYPE);
SYS_NET_ERROR_CASE(SYS_NET_ENOPROTOOPT);
SYS_NET_ERROR_CASE(SYS_NET_EPROTONOSUPPORT);
SYS_NET_ERROR_CASE(SYS_NET_EOPNOTSUPP);
SYS_NET_ERROR_CASE(SYS_NET_EPFNOSUPPORT);
SYS_NET_ERROR_CASE(SYS_NET_EAFNOSUPPORT);
SYS_NET_ERROR_CASE(SYS_NET_EADDRINUSE);
SYS_NET_ERROR_CASE(SYS_NET_EADDRNOTAVAIL);
SYS_NET_ERROR_CASE(SYS_NET_ENETDOWN);
SYS_NET_ERROR_CASE(SYS_NET_ENETUNREACH);
SYS_NET_ERROR_CASE(SYS_NET_ECONNABORTED);
SYS_NET_ERROR_CASE(SYS_NET_ECONNRESET);
SYS_NET_ERROR_CASE(SYS_NET_ENOBUFS);
SYS_NET_ERROR_CASE(SYS_NET_EISCONN);
SYS_NET_ERROR_CASE(SYS_NET_ENOTCONN);
SYS_NET_ERROR_CASE(SYS_NET_ESHUTDOWN);
SYS_NET_ERROR_CASE(SYS_NET_ETOOMANYREFS);
SYS_NET_ERROR_CASE(SYS_NET_ETIMEDOUT);
SYS_NET_ERROR_CASE(SYS_NET_ECONNREFUSED);
SYS_NET_ERROR_CASE(SYS_NET_EHOSTDOWN);
SYS_NET_ERROR_CASE(SYS_NET_EHOSTUNREACH);
#undef SYS_NET_ERROR_CASE
}
return unknown;
});
}
template <>
void fmt_class_string<lv2_socket_type>::format(std::string& out, u64 arg)
{
format_enum(out, arg, [](auto value)
{
switch (value)
{
case SYS_NET_SOCK_STREAM: return "STREAM";
case SYS_NET_SOCK_DGRAM: return "DGRAM";
case SYS_NET_SOCK_RAW: return "RAW";
case SYS_NET_SOCK_DGRAM_P2P: return "DGRAM-P2P";
case SYS_NET_SOCK_STREAM_P2P: return "STREAM-P2P";
}
return unknown;
});
}
template <>
void fmt_class_string<lv2_socket_family>::format(std::string& out, u64 arg)
{
format_enum(out, arg, [](auto value)
{
switch (value)
{
case SYS_NET_AF_UNSPEC: return "UNSPEC";
case SYS_NET_AF_LOCAL: return "LOCAL";
case SYS_NET_AF_INET: return "INET";
case SYS_NET_AF_INET6: return "INET6";
}
return unknown;
});
}
template <>
void fmt_class_string<lv2_ip_protocol>::format(std::string& out, u64 arg)
{
format_enum(out, arg, [](auto value)
{
switch (value)
{
case SYS_NET_IPPROTO_IP: return "IPPROTO_IP";
case SYS_NET_IPPROTO_ICMP: return "IPPROTO_ICMP";
case SYS_NET_IPPROTO_IGMP: return "IPPROTO_IGMP";
case SYS_NET_IPPROTO_TCP: return "IPPROTO_TCP";
case SYS_NET_IPPROTO_UDP: return "IPPROTO_UDP";
case SYS_NET_IPPROTO_ICMPV6: return "IPPROTO_ICMPV6";
}
return unknown;
});
}
template <>
void fmt_class_string<lv2_tcp_option>::format(std::string& out, u64 arg)
{
format_enum(out, arg, [](auto value)
{
switch (value)
{
case SYS_NET_TCP_NODELAY: return "TCP_NODELAY";
case SYS_NET_TCP_MAXSEG: return "TCP_MAXSEG";
case SYS_NET_TCP_MSS_TO_ADVERTISE: return "TCP_MSS_TO_ADVERTISE";
}
return unknown;
});
}
template <>
void fmt_class_string<lv2_socket_option>::format(std::string& out, u64 arg)
{
format_enum(out, arg, [](auto value)
{
switch (value)
{
case SYS_NET_SO_SNDBUF: return "SO_SNDBUF";
case SYS_NET_SO_RCVBUF: return "SO_RCVBUF";
case SYS_NET_SO_SNDLOWAT: return "SO_SNDLOWAT";
case SYS_NET_SO_RCVLOWAT: return "SO_RCVLOWAT";
case SYS_NET_SO_SNDTIMEO: return "SO_SNDTIMEO";
case SYS_NET_SO_RCVTIMEO: return "SO_RCVTIMEO";
case SYS_NET_SO_ERROR: return "SO_ERROR";
case SYS_NET_SO_TYPE: return "SO_TYPE";
case SYS_NET_SO_NBIO: return "SO_NBIO";
case SYS_NET_SO_TPPOLICY: return "SO_TPPOLICY";
case SYS_NET_SO_REUSEADDR: return "SO_REUSEADDR";
case SYS_NET_SO_KEEPALIVE: return "SO_KEEPALIVE";
case SYS_NET_SO_BROADCAST: return "SO_BROADCAST";
case SYS_NET_SO_LINGER: return "SO_LINGER";
case SYS_NET_SO_OOBINLINE: return "SO_OOBINLINE";
case SYS_NET_SO_REUSEPORT: return "SO_REUSEPORT";
case SYS_NET_SO_ONESBCAST: return "SO_ONESBCAST";
case SYS_NET_SO_USECRYPTO: return "SO_USECRYPTO";
case SYS_NET_SO_USESIGNATURE: return "SO_USESIGNATURE";
case SYS_NET_SOL_SOCKET: return "SOL_SOCKET";
}
return unknown;
});
}
template <>
void fmt_class_string<lv2_ip_option>::format(std::string& out, u64 arg)
{
format_enum(out, arg, [](auto value)
{
switch (value)
{
case SYS_NET_IP_HDRINCL: return "IP_HDRINCL";
case SYS_NET_IP_TOS: return "IP_TOS";
case SYS_NET_IP_TTL: return "IP_TTL";
case SYS_NET_IP_MULTICAST_IF: return "IP_MULTICAST_IF";
case SYS_NET_IP_MULTICAST_TTL: return "IP_MULTICAST_TTL";
case SYS_NET_IP_MULTICAST_LOOP: return "IP_MULTICAST_LOOP";
case SYS_NET_IP_ADD_MEMBERSHIP: return "IP_ADD_MEMBERSHIP";
case SYS_NET_IP_DROP_MEMBERSHIP: return "IP_DROP_MEMBERSHIP";
case SYS_NET_IP_TTLCHK: return "IP_TTLCHK";
case SYS_NET_IP_MAXTTL: return "IP_MAXTTL";
case SYS_NET_IP_DONTFRAG: return "IP_DONTFRAG";
}
return unknown;
});
}
template <>
void fmt_class_string<struct in_addr>::format(std::string& out, u64 arg)
{
const uchar* data = reinterpret_cast<const uchar*>(&get_object(arg));
fmt::append(out, "%u.%u.%u.%u", data[0], data[1], data[2], data[3]);
}
#ifdef _WIN32
// Workaround function for WSAPoll not reporting failed connections
void windows_poll(pollfd* fds, unsigned long nfds, int timeout, bool* connecting)
{
// Don't call WSAPoll with zero nfds (errors 10022 or 10038)
if (std::none_of(fds, fds + nfds, [](pollfd& pfd) { return pfd.fd != INVALID_SOCKET; }))
{
if (timeout > 0)
{
Sleep(timeout);
}
return;
}
int r = ::WSAPoll(fds, nfds, timeout);
if (r == SOCKET_ERROR)
{
sys_net.error("WSAPoll failed: %u", WSAGetLastError());
return;
}
for (unsigned long i = 0; i < nfds; i++)
{
if (connecting[i])
{
if (!fds[i].revents)
{
int error = 0;
socklen_t intlen = sizeof(error);
if (getsockopt(fds[i].fd, SOL_SOCKET, SO_ERROR, reinterpret_cast<char*>(&error), &intlen) == -1 || error != 0)
{
// Connection silently failed
connecting[i] = false;
fds[i].revents = POLLERR | POLLHUP | (fds[i].events & (POLLIN | POLLOUT));
}
}
else
{
connecting[i] = false;
}
}
}
}
#endif
// Error helper functions
static int get_native_error()
{
int native_error;
#ifdef _WIN32
native_error = WSAGetLastError();
#else
native_error = errno;
#endif
return native_error;
}
static sys_net_error get_last_error(bool is_blocking, int native_error = 0)
{
// Convert the error code for socket functions to a one for sys_net
sys_net_error result{};
const char* name{};
if (!native_error)
{
native_error = get_native_error();
}
#ifdef _WIN32
#define ERROR_CASE(error) case WSA ## error: result = SYS_NET_ ## error; name = #error; break;
#else
#define ERROR_CASE(error) case error: result = SYS_NET_ ## error; name = #error; break;
#endif
switch (native_error)
{
#ifndef _WIN32
ERROR_CASE(ENOENT);
ERROR_CASE(ENOMEM);
ERROR_CASE(EBUSY);
ERROR_CASE(ENOSPC);
#endif
// TODO: We don't currently support EFAULT or EINTR
//ERROR_CASE(EFAULT);
//ERROR_CASE(EINTR);
ERROR_CASE(EBADF);
ERROR_CASE(EACCES);
ERROR_CASE(EINVAL);
ERROR_CASE(EMFILE);
ERROR_CASE(EPIPE);
ERROR_CASE(EWOULDBLOCK);
ERROR_CASE(EINPROGRESS);
ERROR_CASE(EALREADY);
ERROR_CASE(EDESTADDRREQ);
ERROR_CASE(EMSGSIZE);
ERROR_CASE(EPROTOTYPE);
ERROR_CASE(ENOPROTOOPT);
ERROR_CASE(EPROTONOSUPPORT);
ERROR_CASE(EOPNOTSUPP);
ERROR_CASE(EPFNOSUPPORT);
ERROR_CASE(EAFNOSUPPORT);
ERROR_CASE(EADDRINUSE);
ERROR_CASE(EADDRNOTAVAIL);
ERROR_CASE(ENETDOWN);
ERROR_CASE(ENETUNREACH);
ERROR_CASE(ECONNABORTED);
ERROR_CASE(ECONNRESET);
ERROR_CASE(ENOBUFS);
ERROR_CASE(EISCONN);
ERROR_CASE(ENOTCONN);
ERROR_CASE(ESHUTDOWN);
ERROR_CASE(ETOOMANYREFS);
ERROR_CASE(ETIMEDOUT);
ERROR_CASE(ECONNREFUSED);
ERROR_CASE(EHOSTDOWN);
ERROR_CASE(EHOSTUNREACH);
default:
fmt::throw_exception("sys_net get_last_error(is_blocking=%d, native_error=%d): Unknown/illegal socket error", is_blocking, native_error);
}
if (name && result != SYS_NET_EWOULDBLOCK && result != SYS_NET_EINPROGRESS)
{
sys_net.error("Socket error %s", name);
}
if (is_blocking && result == SYS_NET_EWOULDBLOCK)
{
return {};
}
if (is_blocking && result == SYS_NET_EINPROGRESS)
{
return {};
}
return result;
#undef ERROR_CASE
}
static void network_clear_queue(ppu_thread& ppu)
{
idm::select<lv2_socket>([&](u32, lv2_socket& sock)
{
std::lock_guard lock(sock.mutex);
for (auto it = sock.queue.begin(); it != sock.queue.end();)
{
if (it->first == ppu.id)
{
it = sock.queue.erase(it);
continue;
}
it++;
}
if (sock.queue.empty())
{
sock.events.store({});
}
});
}
// Object in charge of retransmiting packets for STREAM_P2P sockets
class tcp_timeout_monitor
{
public:
void add_message(s32 sock_id, const sockaddr_in *dst, std::vector<u8> data, u64 seq)
{
{
std::lock_guard lock(data_mutex);
const auto now = steady_clock::now();
message msg;
msg.dst_addr = *dst;
msg.sock_id = sock_id;
msg.data = std::move(data);
msg.seq = seq;
msg.initial_sendtime = now;
rtt_info rtt = rtts[sock_id];
const auto expected_time = now + rtt.rtt_time;
msgs.insert(std::make_pair(expected_time, std::move(msg)));
}
wakey.notify_one(); // TODO: Should be improved to only wake if new timeout < old timeout
}
void confirm_data_received(s32 sock_id, u64 ack)
{
std::lock_guard lock(data_mutex);
rtts[sock_id].num_retries = 0;
const auto now = steady_clock::now();
for (auto it = msgs.begin(); it != msgs.end();)
{
auto& msg = it->second;
if (msg.sock_id == sock_id && msg.seq < ack)
{
// Decreases RTT if msg is early
if (now < it->first)
{
const auto actual_rtt = std::chrono::duration_cast<std::chrono::milliseconds>(now - it->second.initial_sendtime);
const auto cur_rtt = rtts[sock_id].rtt_time;
if (cur_rtt > actual_rtt)
{
rtts[sock_id].rtt_time = (actual_rtt + cur_rtt) / 2;
}
}
it = msgs.erase(it);
continue;
}
it++;
}
}
void operator()()
{
while (thread_ctrl::state() != thread_state::aborting)
{
std::unique_lock<std::mutex> lock(data_mutex);
if (msgs.size())
wakey.wait_until(lock, msgs.begin()->first);
else
wakey.wait(lock);
if (thread_ctrl::state() == thread_state::aborting)
return;
const auto now = steady_clock::now();
// Check for messages that haven't been acked
std::set<s32> rtt_increased;
for (auto it = msgs.begin(); it != msgs.end();)
{
if (it->first > now)
break;
// reply is late, increases rtt
auto& msg = it->second;
const auto addr = msg.dst_addr.sin_addr.s_addr;
rtt_info rtt = rtts[msg.sock_id];
// Only increases rtt once per loop(in case a big number of packets are sent at once)
if (!rtt_increased.count(msg.sock_id))
{
rtt.num_retries += 1;
// Increases current rtt by 10%
rtt.rtt_time += (rtt.rtt_time / 10);
rtts[addr] = rtt;
rtt_increased.emplace(msg.sock_id);
}
if (rtt.num_retries >= 10)
{
// Too many retries, need to notify the socket that the connection is dead
idm::check<lv2_socket>(msg.sock_id, [&](lv2_socket& sock)
{
sock.p2ps.status = lv2_socket::p2ps_i::stream_status::stream_closed;
});
it = msgs.erase(it);
continue;
}
// resend the message
const auto res = idm::check<lv2_socket>(msg.sock_id, [&](lv2_socket& sock) -> bool
{
if (sendto(sock.socket, reinterpret_cast<char*>(msg.data.data()), msg.data.size(), 0, reinterpret_cast<const sockaddr*>(&msg.dst_addr), sizeof(msg.dst_addr)) == -1)
{
sock.p2ps.status = lv2_socket::p2ps_i::stream_status::stream_closed;
return false;
}
return true;
});
if (!res || !res.ret)
{
it = msgs.erase(it);
continue;
}
// Update key timeout
msgs.insert(std::make_pair(now + rtt.rtt_time, std::move(msg)));
it = msgs.erase(it);
}
}
}
tcp_timeout_monitor& operator=(thread_state)
{
wakey.notify_one();
return *this;
}
public:
static constexpr auto thread_name = "Tcp Over Udp Timeout Manager Thread"sv;
private:
std::condition_variable wakey;
std::mutex data_mutex;
// List of outgoing messages
struct message
{
s32 sock_id;
::sockaddr_in dst_addr;
std::vector<u8> data;
u64 seq;
steady_clock::time_point initial_sendtime;
};
std::map<steady_clock::time_point, message> msgs; // (wakeup time, msg)
// List of rtts
struct rtt_info
{
unsigned long num_retries = 0;
std::chrono::milliseconds rtt_time = 50ms;
};
std::unordered_map<s32, rtt_info> rtts; // (sock_id, rtt)
};
struct nt_p2p_port
{
// Real socket where P2P packets are received/sent
lv2_socket::socket_type p2p_socket = 0;
u16 port;
shared_mutex bound_p2p_vports_mutex;
// For DGRAM_P2P sockets(vport, sock_id)
std::map<u16, s32> bound_p2p_vports{};
// For STREAM_P2P sockets(key, sock_id)
// key is ( (src_vport) << 48 | (dst_vport) << 32 | addr ) with src_vport and addr being 0 for listening sockets
std::map<u64, s32> bound_p2p_streams{};
// Queued messages from RPCN
shared_mutex s_rpcn_mutex;
std::vector<std::vector<u8>> rpcn_msgs{};
// Queued signaling messages
shared_mutex s_sign_mutex;
std::vector<std::pair<std::pair<u32, u16>, std::vector<u8>>> sign_msgs{};
std::array<u8, 65535> p2p_recv_data{};
nt_p2p_port(u16 port) : port(port)
{
// Creates and bind P2P Socket
p2p_socket = ::socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
if (p2p_socket == -1)
sys_net.fatal("Failed to create DGRAM socket for P2P socket!");
#ifdef _WIN32
u_long _true = 1;
::ioctlsocket(p2p_socket, FIONBIO, &_true);
#else
::fcntl(p2p_socket, F_SETFL, ::fcntl(p2p_socket, F_GETFL, 0) | O_NONBLOCK);
#endif
u32 optval = 131072;
if (setsockopt(p2p_socket, SOL_SOCKET, SO_RCVBUF, reinterpret_cast<const char*>(&optval), sizeof(optval)) != 0)
sys_net.fatal("Error setsockopt SO_RCVBUF on P2P socket");
::sockaddr_in p2p_saddr{};
p2p_saddr.sin_family = AF_INET;
p2p_saddr.sin_port = std::bit_cast<u16, be_t<u16>>(port); // htons(port);
p2p_saddr.sin_addr.s_addr = 0; // binds to 0.0.0.0
const auto ret_bind = ::bind(p2p_socket, reinterpret_cast<sockaddr*>(&p2p_saddr), sizeof(p2p_saddr));
if (ret_bind == -1)
sys_net.fatal("Failed to bind DGRAM socket to %d for P2P!", port);
sys_net.notice("P2P port %d was bound!", port);
}
~nt_p2p_port()
{
if (p2p_socket)
{
#ifdef _WIN32
::closesocket(p2p_socket);
#else
::close(p2p_socket);
#endif
}
}
static u16 tcp_checksum(const u16* buffer, usz size)
{
u32 cksum = 0;
while (size > 1)
{
cksum += *buffer++;
size -= sizeof(u16);
}
if (size)
cksum += *reinterpret_cast<const u8 *>(buffer);
cksum = (cksum >> 16) + (cksum & 0xffff);
cksum += (cksum >> 16);
return static_cast<u16>(~cksum);
}
static std::vector<u8> generate_u2s_packet(const lv2_socket::p2ps_i::encapsulated_tcp& header, const u8 *data, const u32 datasize)
{
const u32 packet_size = (sizeof(u16) + sizeof(lv2_socket::p2ps_i::encapsulated_tcp) + datasize);
ensure(packet_size < 65535); // packet size shouldn't be bigger than possible UDP payload
std::vector<u8> packet(packet_size);
u8 *packet_data = packet.data();
*reinterpret_cast<le_t<u16> *>(packet_data) = header.dst_port;
memcpy(packet_data+sizeof(u16), &header, sizeof(lv2_socket::p2ps_i::encapsulated_tcp));
if(datasize)
memcpy(packet_data+sizeof(u16)+sizeof(lv2_socket::p2ps_i::encapsulated_tcp), data, datasize);
auto* hdr_ptr = reinterpret_cast<lv2_socket::p2ps_i::encapsulated_tcp *>(packet_data+sizeof(u16));
hdr_ptr->checksum = 0;
hdr_ptr->checksum = tcp_checksum(utils::bless<u16>(hdr_ptr), sizeof(lv2_socket::p2ps_i::encapsulated_tcp) + datasize);
return packet;
}
static void send_u2s_packet(lv2_socket &sock, s32 sock_id, std::vector<u8> data, const ::sockaddr_in* dst, u32 seq = 0, bool require_ack = true)
{
char ip_str[16];
inet_ntop(AF_INET, &dst->sin_addr, ip_str, sizeof(ip_str));
sys_net.trace("Sending U2S packet on socket %d(id:%d): data(%d, seq %d, require_ack %d) to %s:%d", sock.socket, sock_id, data.size(), seq, require_ack, ip_str, std::bit_cast<u16, be_t<u16>>(dst->sin_port));
if (sendto(sock.socket, reinterpret_cast<char *>(data.data()), data.size(), 0, reinterpret_cast<const sockaddr*>(dst), sizeof(sockaddr_in)) == -1)
{
sys_net.error("Attempting to send a u2s packet failed(%s), closing socket!", get_last_error(false));
sock.p2ps.status = lv2_socket::p2ps_i::stream_status::stream_closed;
return;
}
// Adds to tcp timeout monitor to resend the message until an ack is received
if (require_ack)
{
auto& tcpm = g_fxo->get<named_thread<tcp_timeout_monitor>>();
tcpm.add_message(sock_id, dst, std::move(data), seq);
}
}
static void dump_packet(lv2_socket::p2ps_i::encapsulated_tcp* tcph)
{
const std::string result = fmt::format("src_port: %d\ndst_port: %d\nflags: %d\nseq: %d\nack: %d\nlen: %d", tcph->src_port, tcph->dst_port, tcph->flags, tcph->seq, tcph->ack, tcph->length);
sys_net.trace("PACKET DUMP:\n%s", result);
}
bool handle_connected(s32 sock_id, lv2_socket::p2ps_i::encapsulated_tcp* tcp_header, u8* data, ::sockaddr_storage* op_addr)
{
const auto sock = idm::check<lv2_socket>(sock_id, [&](lv2_socket& sock) -> bool
{
std::lock_guard lock(sock.mutex);
if (sock.p2ps.status != lv2_socket::p2ps_i::stream_status::stream_connected && sock.p2ps.status != lv2_socket::p2ps_i::stream_status::stream_handshaking)
return false;
dump_packet(tcp_header);
if (tcp_header->flags == lv2_socket::p2ps_i::ACK)
{
auto& tcpm = g_fxo->get<named_thread<tcp_timeout_monitor>>();
tcpm.confirm_data_received(sock_id, tcp_header->ack);
}
auto send_ack = [&]()
{
auto final_ack = sock.p2ps.data_beg_seq;
while (sock.p2ps.received_data.contains(final_ack))
{
final_ack += sock.p2ps.received_data.at(final_ack).size();
}
sock.p2ps.data_available = final_ack - sock.p2ps.data_beg_seq;
lv2_socket::p2ps_i::encapsulated_tcp send_hdr;
send_hdr.src_port = tcp_header->dst_port;
send_hdr.dst_port = tcp_header->src_port;
send_hdr.flags = lv2_socket::p2ps_i::ACK;
send_hdr.ack = final_ack;
auto packet = generate_u2s_packet(send_hdr, nullptr, 0);
sys_net.trace("Sent ack %d", final_ack);
send_u2s_packet(sock, sock_id, std::move(packet), reinterpret_cast<::sockaddr_in*>(op_addr), 0, false);
// check if polling is happening
if (sock.p2ps.data_available && sock.events.test_and_reset(lv2_socket::poll::read))
{
bs_t<lv2_socket::poll> events = lv2_socket::poll::read;
for (auto it = sock.queue.begin(); events && it != sock.queue.end();)
{
if (it->second(events))
{
it = sock.queue.erase(it);
continue;
}
it++;
}
if (sock.queue.empty())
{
sock.events.store({});
}
}
};
if (sock.p2ps.status == lv2_socket::p2ps_i::stream_status::stream_handshaking)
{
// Only expect SYN|ACK
if (tcp_header->flags == (lv2_socket::p2ps_i::SYN | lv2_socket::p2ps_i::ACK))
{
sys_net.trace("Received SYN|ACK, status is now connected");
sock.p2ps.data_beg_seq = tcp_header->seq + 1;
sock.p2ps.status = lv2_socket::p2ps_i::stream_status::stream_connected;
send_ack();
}
return true;
}
else if (sock.p2ps.status == lv2_socket::p2ps_i::stream_status::stream_connected)
{
if (tcp_header->seq < sock.p2ps.data_beg_seq)
{
// Data has already been processed
sys_net.trace("Data has already been processed");
if (tcp_header->flags != lv2_socket::p2ps_i::ACK && tcp_header->flags != lv2_socket::p2ps_i::RST)
send_ack();
return true;
}
switch (tcp_header->flags)
{
case lv2_socket::p2ps_i::PSH:
case 0:
{
if (!sock.p2ps.received_data.count(tcp_header->seq))
{
// New data
sock.p2ps.received_data.emplace(tcp_header->seq, std::vector<u8>(data, data + tcp_header->length));
}
else
{
sys_net.trace("Data was not new!");
}
send_ack();
return true;
}
case lv2_socket::p2ps_i::RST:
case lv2_socket::p2ps_i::FIN:
{
sock.p2ps.status = lv2_socket::p2ps_i::stream_status::stream_closed;
return false;
}
default:
{
sys_net.error("Unknown U2S TCP flag received");
return true;
}
}
}
return true;
});
if (!sock || !sock.ret)
return false;
return true;
}
bool handle_listening(s32 sock_id, lv2_socket::p2ps_i::encapsulated_tcp* tcp_header, u8* /*data*/, ::sockaddr_storage* op_addr)
{
auto sock = idm::get<lv2_socket>(sock_id);
if (!sock)
return false;
std::lock_guard lock(sock->mutex);
if (sock->p2ps.status != lv2_socket::p2ps_i::stream_status::stream_listening)
return false;
// Only valid packet
if (tcp_header->flags == lv2_socket::p2ps_i::SYN && sock->p2ps.backlog.size() < sock->p2ps.max_backlog)
{
// Yes, new connection and a backlog is available, create a new lv2_socket for it and send SYN|ACK
// Prepare reply packet
sys_net.notice("Received connection on listening STREAM-P2P socket!");
lv2_socket::p2ps_i::encapsulated_tcp send_hdr;
send_hdr.src_port = tcp_header->dst_port;
send_hdr.dst_port = tcp_header->src_port;
send_hdr.flags = lv2_socket::p2ps_i::SYN | lv2_socket::p2ps_i::ACK;
send_hdr.ack = tcp_header->seq + 1;
// Generates random starting SEQ
send_hdr.seq = rand();
// Create new socket
auto sock_lv2 = std::make_shared<lv2_socket>(0, SYS_NET_SOCK_STREAM_P2P, SYS_NET_AF_INET);
sock_lv2->socket = sock->socket;
sock_lv2->p2p.port = sock->p2p.port;
sock_lv2->p2p.vport = sock->p2p.vport;
sock_lv2->p2ps.op_addr = reinterpret_cast<struct sockaddr_in*>(op_addr)->sin_addr.s_addr;
sock_lv2->p2ps.op_port = std::bit_cast<u16, be_t<u16>>((reinterpret_cast<struct sockaddr_in*>(op_addr)->sin_port));
sock_lv2->p2ps.op_vport = tcp_header->src_port;
sock_lv2->p2ps.cur_seq = send_hdr.seq + 1;
sock_lv2->p2ps.data_beg_seq = send_hdr.ack;
sock_lv2->p2ps.status = lv2_socket::p2ps_i::stream_status::stream_connected;
const s32 new_sock_id = idm::import_existing<lv2_socket>(sock_lv2);
const u64 key_connected = (reinterpret_cast<struct sockaddr_in*>(op_addr)->sin_addr.s_addr) | (static_cast<u64>(tcp_header->src_port) << 48) | (static_cast<u64>(tcp_header->dst_port) << 32);
bound_p2p_streams.emplace(key_connected, new_sock_id);
auto packet = generate_u2s_packet(send_hdr, nullptr, 0);
{
std::lock_guard lock(sock_lv2->mutex);
send_u2s_packet(*sock_lv2, new_sock_id, std::move(packet), reinterpret_cast<::sockaddr_in*>(op_addr), send_hdr.seq);
}
sock->p2ps.backlog.push(new_sock_id);
if (sock->events.test_and_reset(lv2_socket::poll::read))
{
bs_t<lv2_socket::poll> events = lv2_socket::poll::read;
for (auto it = sock->queue.begin(); events && it != sock->queue.end();)
{
if (it->second(events))
{
it = sock->queue.erase(it);
continue;
}
it++;
}
if (sock->queue.empty())
{
sock->events.store({});
}
}
}
else if (tcp_header->flags == lv2_socket::p2ps_i::SYN)
{
// Send a RST packet on backlog full
sys_net.trace("Backlog was full, sent a RST packet");
lv2_socket::p2ps_i::encapsulated_tcp send_hdr;
send_hdr.src_port = tcp_header->dst_port;
send_hdr.dst_port = tcp_header->src_port;
send_hdr.flags = lv2_socket::p2ps_i::RST;
auto packet = generate_u2s_packet(send_hdr, nullptr, 0);
send_u2s_packet(*sock, sock_id, std::move(packet), reinterpret_cast<::sockaddr_in*>(op_addr), 0, false);
}
// Ignore other packets?
return true;
}
bool recv_data()
{
::sockaddr_storage native_addr;
::socklen_t native_addrlen = sizeof(native_addr);
const auto recv_res = ::recvfrom(p2p_socket, reinterpret_cast<char*>(p2p_recv_data.data()), p2p_recv_data.size(), 0, reinterpret_cast<struct sockaddr*>(&native_addr), &native_addrlen);
if (recv_res == -1)
{
auto lerr = get_last_error(false);
if (lerr != SYS_NET_EINPROGRESS && lerr != SYS_NET_EWOULDBLOCK)
sys_net.error("Error recvfrom on P2P socket: %d", lerr);
return false;
}
if (recv_res < static_cast<s32>(sizeof(u16)))
{
sys_net.error("Received badly formed packet on P2P port(no vport)!");
return true;
}
u16 dst_vport = reinterpret_cast<le_t<u16>&>(p2p_recv_data[0]);
if (dst_vport == 0) // Reserved for messages from RPCN server
{
std::vector<u8> rpcn_msg(recv_res - sizeof(u16));
memcpy(rpcn_msg.data(), p2p_recv_data.data() + sizeof(u16), recv_res - sizeof(u16));
std::lock_guard lock(s_rpcn_mutex);
rpcn_msgs.push_back(std::move(rpcn_msg));
return true;
}
if (dst_vport == 65535) // Reserved for signaling
{
std::vector<u8> sign_msg(recv_res - sizeof(u16));
memcpy(sign_msg.data(), p2p_recv_data.data() + sizeof(u16), recv_res - sizeof(u16));
std::pair<std::pair<u32, u16>, std::vector<u8>> msg;
msg.first.first = reinterpret_cast<struct sockaddr_in*>(&native_addr)->sin_addr.s_addr;
msg.first.second = std::bit_cast<u16, be_t<u16>>(reinterpret_cast<struct sockaddr_in*>(&native_addr)->sin_port);
msg.second = std::move(sign_msg);
{
std::lock_guard lock(s_sign_mutex);
sign_msgs.push_back(std::move(msg));
}
auto& sigh = g_fxo->get<named_thread<signaling_handler>>();
sigh.wake_up();
return true;
}
{
std::lock_guard lock(bound_p2p_vports_mutex);
if (bound_p2p_vports.contains(dst_vport))
{
sys_net_sockaddr_in_p2p p2p_addr{};
p2p_addr.sin_len = sizeof(sys_net_sockaddr_in);
p2p_addr.sin_family = SYS_NET_AF_INET;
p2p_addr.sin_addr = std::bit_cast<be_t<u32>, u32>(reinterpret_cast<struct sockaddr_in*>(&native_addr)->sin_addr.s_addr);
p2p_addr.sin_vport = dst_vport;
p2p_addr.sin_port = std::bit_cast<be_t<u16>, u16>(reinterpret_cast<struct sockaddr_in*>(&native_addr)->sin_port);
std::vector<u8> p2p_data(recv_res - sizeof(u16));
memcpy(p2p_data.data(), p2p_recv_data.data() + sizeof(u16), recv_res - sizeof(u16));
const auto sock = idm::check<lv2_socket>(bound_p2p_vports.at(dst_vport), [&](lv2_socket& sock)
{
std::lock_guard lock(sock.mutex);
ensure(sock.type == SYS_NET_SOCK_DGRAM_P2P);
sock.p2p.data.push(std::make_pair(std::move(p2p_addr), std::move(p2p_data)));
sys_net.trace("Received a P2P packet for vport %d and saved it", dst_vport);
// Check if poll is happening
if (sock.events.test_and_reset(lv2_socket::poll::read))
{
bs_t<lv2_socket::poll> events = lv2_socket::poll::read;
for (auto it = sock.queue.begin(); events && it != sock.queue.end();)
{
if (it->second(events))
{
it = sock.queue.erase(it);
continue;
}
it++;
}
if (sock.queue.empty())
{
sock.events.store({});
}
}
});
// Should not happen in theory
if (!sock)
bound_p2p_vports.erase(dst_vport);
return true;
}
}
// Not directed at a bound DGRAM_P2P vport so check if the packet is a STREAM-P2P packet
const auto sp_size = recv_res - sizeof(u16);
u8 *sp_data = p2p_recv_data.data() + sizeof(u16);