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network_win32.cpp
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// SPDX-License-Identifier: AGPL-1.0-only
// Copyright (C) 2018 Ludvig Strigeus <[email protected]>. All Rights Reserved.
#include "stdafx.h"
#include "network_win32.h"
#include "wireguard_config.h"
#include "netapi.h"
#include <Iphlpapi.h>
#include <Mswsock.h>
#include <ws2ipdef.h>
#include <stdlib.h>
#include <assert.h>
#include <malloc.h>
#include <stddef.h>
#include <string.h>
#include <vector>
#include <Iphlpapi.h>
#include <assert.h>
#include <exdisp.h>
#include "tunsafe_endian.h"
#include "wireguard.h"
#include "util.h"
#include <algorithm>
#include "network_win32_dnsblock.h"
#include "util_win32.h"
#include "tunsafe_wg_plugin.h"
enum {
HARD_MAXIMUM_QUEUE_SIZE = 102400,
MAX_BYTES_IN_UDP_OUT_QUEUE = 256 * 1024,
MAX_BYTES_IN_UDP_OUT_QUEUE_SMALL = (256 + 64) * 1024,
// On Windows 7 with NDIS6 sometimes the tun queue blows up.
HARD_MAXIMUM_TUN_QUEUE_SIZE = 16384,
};
enum {
kMetricNone = -1,
kMetricAutomatic = 0,
};
static uint8 internet_route_blocking_state;
static SLIST_HEADER freelist_head;
static HKEY g_hklm_reg_key;
static uint8 g_killswitch_curr, g_killswitch_want, g_killswitch_currconn;
bool g_allow_pre_post;
static volatile bool g_fail_malloc_flag;
static void DeactivateKillSwitch(uint32 want);
Packet *AllocPacket() {
Packet *packet = (Packet*)InterlockedPopEntrySList(&freelist_head);
if (packet == NULL) {
while ((packet = (Packet *)_aligned_malloc(kPacketAllocSize, 16)) == NULL) {
if (g_fail_malloc_flag)
return NULL;
Sleep(1000);
}
}
packet->Reset();
return packet;
}
void FreePacket(Packet *packet) {
InterlockedPushEntrySList(&freelist_head, &packet->list_entry);
}
static bool IsIpv6AddressSet(const void *p) {
return (ReadLE64(p) | ReadLE64((char*)p + 8)) != 0;
}
extern "C"
PSLIST_ENTRY __fastcall InterlockedPushListSList(
IN PSLIST_HEADER ListHead,
IN PSLIST_ENTRY List,
IN PSLIST_ENTRY ListEnd,
IN ULONG Count
);
void FreePackets(Packet *packet, Packet **end, int count) {
InterlockedPushListSList(&freelist_head, &packet->list_entry, (PSLIST_ENTRY)end, count);
}
void FreeAllPackets() {
Packet *p;
p = (Packet*)InterlockedFlushSList(&freelist_head);
while (Packet *r = p) {
p = Packet_NEXT(p);
_aligned_free(r);
}
}
void InitPacketMutexes() {
static bool mutex_inited;
if (!mutex_inited) {
mutex_inited = true;
InitializeSListHead(&freelist_head);
}
}
#define kConcurrentReadTap 16
#define kConcurrentWriteTap 16
#define kAdapterKeyName "SYSTEM\\CurrentControlSet\\Control\\Class\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
#define kNetworkConnectionsKeyName "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
#define kTapComponentId "tap0901"
#define TAP_CONTROL_CODE(request,method) \
CTL_CODE (FILE_DEVICE_UNKNOWN, request, method, FILE_ANY_ACCESS)
#define TAP_IOCTL_GET_MAC TAP_CONTROL_CODE(1, METHOD_BUFFERED)
#define TAP_IOCTL_GET_VERSION TAP_CONTROL_CODE(2, METHOD_BUFFERED)
#define TAP_IOCTL_GET_MTU TAP_CONTROL_CODE(3, METHOD_BUFFERED)
#define TAP_IOCTL_GET_INFO TAP_CONTROL_CODE(4, METHOD_BUFFERED)
#define TAP_IOCTL_CONFIG_POINT_TO_POINT TAP_CONTROL_CODE(5, METHOD_BUFFERED)
#define TAP_IOCTL_SET_MEDIA_STATUS TAP_CONTROL_CODE(6, METHOD_BUFFERED)
#define TAP_IOCTL_CONFIG_DHCP_MASQ TAP_CONTROL_CODE(7, METHOD_BUFFERED)
#define TAP_IOCTL_GET_LOG_LINE TAP_CONTROL_CODE(8, METHOD_BUFFERED)
#define TAP_IOCTL_CONFIG_DHCP_SET_OPT TAP_CONTROL_CODE(9, METHOD_BUFFERED)
#define TAP_IOCTL_CONFIG_TUN TAP_CONTROL_CODE(10, METHOD_BUFFERED)
static bool RunNetsh(const char *cmdline) {
wchar_t path[MAX_PATH + 20];
size_t size = GetSystemDirectoryW(path, MAX_PATH);
bool result = false;
if (!size) {
RERROR("GetSystemDirectory failed");
return false;
}
memcpy(path + size, L"\\netsh.exe", 11 * sizeof(path[0]));
size_t cmdline_size = strlen(cmdline);
wchar_t *cmdlinew = new wchar_t[cmdline_size + 1];
for (size_t i = 0; i <= cmdline_size; i++)
cmdlinew[i] = cmdline[i];
STARTUPINFOW si = {0};
PROCESS_INFORMATION pi = {0};
GetStartupInfoW(&si);
si.dwFlags = STARTF_USESHOWWINDOW;
si.wShowWindow = SW_HIDE;
if (CreateProcessW(path, cmdlinew, NULL, NULL, FALSE, CREATE_NO_WINDOW, NULL, NULL, &si, &pi)) {
DWORD exit_code = -1;
WaitForSingleObject(pi.hProcess, INFINITE);
GetExitCodeProcess(pi.hProcess, &exit_code);
if (exit_code != 0)
RERROR("Netsh failed (%d) : %s", exit_code, cmdline);
else {
RINFO("Run: %s", cmdline);
result = true;
}
CloseHandle(pi.hThread);
CloseHandle(pi.hProcess);
} else {
RERROR("CreateProcess failed: %s", cmdline);
}
delete[]cmdlinew;
return result;
}
// Open the TAP adapter, either a random one or a specific one
// On return, the adapter is locked in |TunAdaptersInUse|.
static HANDLE OpenTunAdapter(char guid[ADAPTER_GUID_SIZE], TunsafeRunner *runner, DWORD open_flags) {
char path[128];
HANDLE h;
int retries = 0;
std::vector<GuidAndDevName> adapters;
// When guid is empty, we try all adapters, otherwise
// just try the specific adapter
if (guid[0] == 0) {
GetTapAdapterInfo(&adapters);
if (adapters.empty()) {
RERROR("Unable to find any TAP adapters");
RERROR(" Please ensure that TunSafe-TAP is properly installed.");
return NULL;
}
} else {
adapters.emplace_back();
memcpy(adapters.back().guid, guid, ADAPTER_GUID_SIZE);
adapters.back().name[0] = 0;
}
TunAdaptersInUse *tun_adapters_in_use = TunAdaptersInUse::GetInstance();
RETRY:
bool did_try_adapter = false;
int error_code = 0;
for (GuidAndDevName &x : adapters) {
snprintf(path, sizeof(path), "\\\\.\\Global\\%s.tap", x.guid);
if (tun_adapters_in_use->Acquire(x.guid, static_cast<TunsafeBackend*>(runner->backend()))) {
h = CreateFile(path, GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | open_flags, 0);
if (h != INVALID_HANDLE_VALUE) {
memcpy(guid, x.guid, ADAPTER_GUID_SIZE);
return h;
}
did_try_adapter = true;
error_code = GetLastError();
tun_adapters_in_use->Release(static_cast<TunsafeBackend*>(runner->backend()));
}
}
if (!did_try_adapter) {
RERROR("All TAP adapters are currently in use");
return NULL;
}
// Sometimes if you close the device right before, it will fail to open with errorcode 31.
// When resuming from sleep in my VM, the error code is ERROR_FILE_NOT_FOUND
if ((error_code == ERROR_FILE_NOT_FOUND || error_code == ERROR_GEN_FAILURE) && !runner->exit_code()) {
if (retries <= 10) {
RERROR("OpenTapAdapter: CreateFile failed: 0x%X... retrying%s", error_code, retries == 10 ? " (last notice)" : "");
if (retries == 10) {
if (error_code == ERROR_FILE_NOT_FOUND) {
RERROR(" Please ensure that TunSafe-TAP is properly installed.");
} else if (error_code == ERROR_GEN_FAILURE) {
RERROR(" Please ensure that the TAP device is not in use.");
}
runner->backend()->SetStatus(TunsafeBackend::kStatusTunRetrying);
}
}
int sleep_amount = 250 * std::min(++retries, 40);
for (;;) {
if (runner->exit_code())
return NULL;
if (sleep_amount == 0)
break;
Sleep(125);
sleep_amount -= 125;
}
goto RETRY;
}
RERROR("OpenTapAdapter: CreateFile failed: 0x%X", error_code);
return NULL;
}
static bool AddRoute(int family,
const void *dest, int dest_prefix,
const void *gateway, const NET_LUID *interface_luid,
std::vector<MIB_IPFORWARD_ROW2> *undo_array) {
MIB_IPFORWARD_ROW2 row = {0};
char buf1[kSizeOfAddress], buf2[kSizeOfAddress];
row.InterfaceLuid = *interface_luid;
row.DestinationPrefix.PrefixLength = dest_prefix;
row.DestinationPrefix.Prefix.si_family = family;
row.NextHop.si_family = family;
if (family == AF_INET) {
memcpy(&row.DestinationPrefix.Prefix.Ipv4.sin_addr, dest, 4);
memcpy(&row.NextHop.Ipv4.sin_addr, gateway, 4);
} else if (family == AF_INET6) {
memcpy(&row.DestinationPrefix.Prefix.Ipv6.sin6_addr, dest, 16);
memcpy(&row.NextHop.Ipv6.sin6_addr, gateway, 16);
} else {
return false;
}
row.ValidLifetime = 0xffffffff;
row.PreferredLifetime = 0xffffffff;
row.Metric = 100;
row.Protocol = MIB_IPPROTO_NETMGMT;
DWORD error = CreateIpForwardEntry2(&row);
if (error == NO_ERROR || error == ERROR_OBJECT_ALREADY_EXISTS) {
if (undo_array)
undo_array->push_back(row);
RINFO("Added Route %s => %s%s", print_ip_prefix(buf1, family, dest, dest_prefix),
print_ip_prefix(buf2, family, gateway, -1), (error == ERROR_OBJECT_ALREADY_EXISTS) ? " (already exists)" : "");
return true;
}
RINFO("AddRoute failed (%d) %s => %s", error, print_ip_prefix(buf1, family, dest, dest_prefix),
print_ip_prefix(buf2, family, gateway, -1));
return false;
}
static bool DeleteRoute(MIB_IPFORWARD_ROW2 *row) {
char buf1[kSizeOfAddress], buf2[kSizeOfAddress];
DWORD error = DeleteIpForwardEntry2(row);
print_ip_prefix(buf1, row->DestinationPrefix.Prefix.si_family,
(row->DestinationPrefix.Prefix.si_family == AF_INET) ? (uint8*) &row->DestinationPrefix.Prefix.Ipv4.sin_addr : (uint8*) &row->DestinationPrefix.Prefix.Ipv6.sin6_addr, row->DestinationPrefix.PrefixLength);
print_ip_prefix(buf2, row->NextHop.si_family,
(row->NextHop.si_family == AF_INET) ? (uint8*)&row->NextHop.Ipv4.sin_addr : (uint8*)&row->NextHop.Ipv6.sin6_addr, -1);
if (error == NO_ERROR) {
RINFO("Deleted Route %s => %s", buf1, buf2);
return true;
}
RINFO("DeleteRoute failed (%d) %s => %s", error, buf1, buf2);
return false;
}
static uint32 CidrToNetmaskV4(int cidr) {
return cidr == 32 ? 0xffffffff : 0xffffffff << (32 - cidr);
}
struct RouteInfo {
uint8 default_gw[16];
NET_LUID default_adapter;
bool found_default_adapter;
uint8 found_null_routes;
};
static bool IsRouteOriginatingFromNullRoute(MIB_IPFORWARD_ROW2 *row) {
if (!(row->InterfaceLuid.Info.IfType == 24 && row->Protocol == MIB_IPPROTO_NETMGMT && row->DestinationPrefix.PrefixLength == 1))
return false;
if (row->NextHop.si_family == AF_INET) {
return (row->NextHop.Ipv4.sin_addr.S_un.S_addr == 0);
} else if (row->NextHop.si_family == AF_INET6) {
static const uint32 nulladdr[4];
return memcmp(&row->NextHop.Ipv6.sin6_addr, nulladdr, 16) == 0;
}
return false;
}
static bool IsDestinationRouteEqualTo(MIB_IPFORWARD_ROW2 *row, const WgCidrAddr *addr) {
if (addr->size == 32) {
return row->DestinationPrefix.Prefix.si_family == AF_INET &&
row->DestinationPrefix.PrefixLength == addr->cidr &&
memcmp(&row->DestinationPrefix.Prefix.Ipv4.sin_addr, addr->addr, 4) == 0;
} else if (addr->size == 128) {
return row->DestinationPrefix.Prefix.si_family == AF_INET6 &&
row->DestinationPrefix.PrefixLength == addr->cidr &&
memcmp(&row->DestinationPrefix.Prefix.Ipv6.sin6_addr, addr->addr, 16) == 0;
} else {
return false;
}
}
static bool IsDestinationRouteEqualToAny(MIB_IPFORWARD_ROW2 *row, const std::vector<WgCidrAddr> &addr) {
for (const WgCidrAddr &x : addr)
if (IsDestinationRouteEqualTo(row, &x))
return true;
return false;
}
static void DeleteRouteOrPrintErr(MIB_IPFORWARD_ROW2 *row) {
char buf1[kSizeOfAddress];
UINT32 r = DeleteIpForwardEntry2(row);
if (r)
RERROR("Unable to delete old route (%d): %s", r,
print_ip_prefix(buf1, row->DestinationPrefix.Prefix.si_family, row->DestinationPrefix.Prefix.si_family == AF_INET ?
(void*)&row->DestinationPrefix.Prefix.Ipv4.sin_addr :
(void*)&row->DestinationPrefix.Prefix.Ipv6.sin6_addr, row->DestinationPrefix.PrefixLength));
}
static bool GetDefaultRouteAndDeleteOldRoutes(int family, const NET_LUID *InterfaceLuid, bool keep_null_routes, const std::vector<WgCidrAddr> *old_endpoint_to_delete, RouteInfo *ri) {
MIB_IPFORWARD_TABLE2 *table = NULL;
assert(family == AF_INET || family == AF_INET6);
ri->found_default_adapter = false;
ri->found_null_routes = 0;
if (GetIpForwardTable2(family, &table))
return false;
DWORD rv = 0;
DWORD gw_metric = 0xffffffff;
for (unsigned i = 0; i < table->NumEntries; i++) {
MIB_IPFORWARD_ROW2 *row = &table->Table[i];
if (InterfaceLuid && memcmp(&row->InterfaceLuid, InterfaceLuid, sizeof(NET_LUID)) == 0) {
if (row->Protocol == MIB_IPPROTO_NETMGMT && !row->AutoconfigureAddress)
DeleteRouteOrPrintErr(row);
} else if (IsRouteOriginatingFromNullRoute(row)) {
ri->found_null_routes++;
if (!keep_null_routes)
DeleteRouteOrPrintErr(row);
} else if (row->DestinationPrefix.PrefixLength == 0 && row->Metric < gw_metric) {
gw_metric = row->Metric;
if (family == AF_INET) {
memcpy(&ri->default_gw, &row->NextHop.Ipv4.sin_addr, 4);
} else {
memcpy(&ri->default_gw, &row->NextHop.Ipv6.sin6_addr, 16);
}
ri->default_adapter = row->InterfaceLuid;
ri->found_default_adapter = true;
}
}
if (old_endpoint_to_delete && ri->found_default_adapter) {
for (unsigned i = 0; i < table->NumEntries; i++) {
MIB_IPFORWARD_ROW2 *row = &table->Table[i];
if (row->Protocol == MIB_IPPROTO_NETMGMT && memcmp(&row->InterfaceLuid, &ri->default_adapter, sizeof(NET_LUID)) == 0) {
if (IsDestinationRouteEqualToAny(row, *old_endpoint_to_delete))
DeleteRouteOrPrintErr(row);
}
}
}
FreeMibTable(table);
return (rv == 0);
}
void FreePacketList(Packet *pp) {
while (Packet *p = pp) {
pp = Packet_NEXT(p);
FreePacket(p);
}
}
UdpSocketWin32::UdpSocketWin32(NetworkWin32 *network_win32) {
network_ = network_win32;
wqueue_end_ = &wqueue_;
wqueue_ = NULL;
socket_ = INVALID_SOCKET;
socket_ipv6_ = INVALID_SOCKET;
finished_reads_ = NULL;
finished_reads_end_ = &finished_reads_;
finished_reads_count_ = 0;
max_read_ipv6_ = 0;
num_reads_[0] = num_reads_[1] = 0;
num_writes_ = 0;
pending_writes_ = NULL;
qsize1_ = 0;
qsize2_ = 0;
}
UdpSocketWin32::~UdpSocketWin32() {
closesocket(socket_);
closesocket(socket_ipv6_);
FreePacketList(wqueue_);
}
bool UdpSocketWin32::Configure(int listen_on_port) {
// If attempting to initialize when the thread is already started, then stop
// the thread, reinitialize, and start the thread.
if (network_->thread_ != NULL) {
network_->StopThread();
bool retcode = Configure(listen_on_port);
network_->StartThread();
return retcode;
}
bool retval = false;
SOCKET socket_ipv4 = INVALID_SOCKET, socket_ipv6 = INVALID_SOCKET;
socket_ipv4 = WSASocket(AF_INET, SOCK_DGRAM, 0, NULL, 0, WSA_FLAG_OVERLAPPED);
if (socket_ipv4 == INVALID_SOCKET) {
RERROR("UdpSocketWin32::Initialize WSASocket failed");
goto fail;
}
if (!CreateIoCompletionPort((HANDLE)socket_ipv4, network_->completion_port_handle_, 0, 0)) {
RERROR("UdpSocketWin32::Initialize CreateIoCompletionPort failed");
goto fail;
}
{
sockaddr_in sin = {0};
sin.sin_family = AF_INET;
sin.sin_port = htons(listen_on_port);
if (bind(socket_ipv4, (struct sockaddr*)&sin, sizeof(sin)) != 0) {
RERROR("UdpSocketWin32::Initialize bind failed");
goto fail;
}
}
// Also open up a socket for ipv6
socket_ipv6 = WSASocket(AF_INET6, SOCK_DGRAM, 0, NULL, 0, WSA_FLAG_OVERLAPPED);
if (socket_ipv6 != INVALID_SOCKET) {
if (!CreateIoCompletionPort((HANDLE)socket_ipv6, network_->completion_port_handle_, 0, 0)) {
RERROR("IPv6 Socket completion port failed.");
closesocket(socket_ipv6);
socket_ipv6 = INVALID_SOCKET;
} else {
sockaddr_in6 sin6 = {0};
sin6.sin6_family = AF_INET6;
sin6.sin6_port = htons(listen_on_port);
if (bind(socket_ipv6, (struct sockaddr*)&sin6, sizeof(sin6)) != 0) {
RERROR("UdpSocketWin32::Initialize bind failed IPv6");
}
}
} else {
RERROR("IPv6 Socket creation failed.");
}
std::swap(socket_ipv6_, socket_ipv6);
std::swap(socket_, socket_ipv4);
retval = true;
max_read_ipv6_ = socket_ipv6 != INVALID_SOCKET ? 1 : 0;
fail:
if (socket_ipv4 != INVALID_SOCKET)
closesocket(socket_ipv4);
if (socket_ipv6 != INVALID_SOCKET)
closesocket(socket_ipv6);
return retval;
}
// Called on another thread to queue up a udp packet
void UdpSocketWin32::WriteUdpPacket(Packet *packet) {
if (qsize2_ - qsize1_ >= (unsigned)(packet->size < 576 ? MAX_BYTES_IN_UDP_OUT_QUEUE_SMALL : MAX_BYTES_IN_UDP_OUT_QUEUE)) {
FreePacket(packet);
return;
}
packet->queue_next = NULL;
qsize2_ += packet->size;
mutex_.Acquire();
Packet *was_empty = wqueue_;
*wqueue_end_ = packet;
wqueue_end_ = &Packet_NEXT(packet);
mutex_.Release();
if (was_empty == NULL)
network_->WakeUp();
}
enum {
kUdpGetQueuedCompletionStatusSize = kConcurrentWriteTap + kConcurrentReadTap + 1
};
#ifndef STATUS_PORT_UNREACHABLE
#define STATUS_PORT_UNREACHABLE 0xC000023F
#endif
static inline bool IsIgnoredUdpError(DWORD err) {
return err == WSAEMSGSIZE || err == WSAECONNRESET || err == WSAENETRESET || err == STATUS_PORT_UNREACHABLE;
}
void UdpSocketWin32::DoMoreReads() {
// Listen with multiple ipv6 packets only if we ever sent an ipv6 packet.
for (int i = num_reads_[IPV6]; i < max_read_ipv6_; i++) {
Packet *p = network_->packet_pool().AllocPacketFromPool();
if (!p)
break;
restart_read_udp6:
ClearOverlapped(&p->overlapped);
WSABUF wsabuf = {(ULONG)kPacketCapacity, (char*)p->data};
DWORD flags = 0;
p->userdata = IPV6;
p->sin_size = sizeof(p->addr.sin6);
p->queue_cb = this;
if (WSARecvFrom(socket_ipv6_, &wsabuf, 1, NULL, &flags, (struct sockaddr*)&p->addr, &p->sin_size, &p->overlapped, NULL) != 0) {
DWORD err = WSAGetLastError();
if (err != WSA_IO_PENDING) {
if (err == WSAEMSGSIZE || err == WSAECONNRESET || err == WSAENETRESET)
goto restart_read_udp6;
RERROR("UdpSocketWin32:WSARecvFrom failed 0x%X", err);
FreePacket(p);
break;
}
}
num_reads_[IPV6]++;
}
// Initiate more reads, reusing the Packet structures in |finished_writes|.
if (socket_ != INVALID_SOCKET) {
for (int i = num_reads_[IPV4]; i < kConcurrentReadUdp; i++) {
Packet *p = network_->packet_pool().AllocPacketFromPool();
if (!p)
break;
restart_read_udp:
ClearOverlapped(&p->overlapped);
WSABUF wsabuf = {(ULONG)kPacketCapacity, (char*)p->data};
DWORD flags = 0;
p->userdata = IPV4;
p->sin_size = sizeof(p->addr.sin);
p->queue_cb = this;
if (WSARecvFrom(socket_, &wsabuf, 1, NULL, &flags, (struct sockaddr*)&p->addr, &p->sin_size, &p->overlapped, NULL) != 0) {
DWORD err = WSAGetLastError();
if (err != WSA_IO_PENDING) {
if (err == WSAEMSGSIZE || err == WSAECONNRESET || err == WSAENETRESET)
goto restart_read_udp;
RERROR("UdpSocketWin32:WSARecvFrom failed 0x%X", err);
FreePacket(p);
break;
}
}
num_reads_[IPV4]++;
}
}
}
void UdpSocketWin32::ProcessPackets() {
// Push all the finished reads to the packet handler
if (finished_reads_ != NULL) {
packet_handler_->PostPackets(finished_reads_, finished_reads_end_, finished_reads_count_);
finished_reads_ = NULL;
finished_reads_end_ = &finished_reads_;
finished_reads_count_ = 0;
}
}
void UdpSocketWin32::DoMoreWrites() {
Packet *pending_writes = pending_writes_;
// Initiate more writes from |wqueue_|
while (num_writes_ < kConcurrentWriteUdp) {
// Refill from queue if empty, avoid taking the mutex if it looks empty
if (!pending_writes) {
if (!wqueue_)
break;
mutex_.Acquire();
pending_writes = wqueue_;
wqueue_end_ = &wqueue_;
wqueue_ = NULL;
mutex_.Release();
if (!pending_writes)
break;
}
qsize1_ += pending_writes->size;
// Then issue writes
Packet *p = pending_writes;
pending_writes = Packet_NEXT(p);
ClearOverlapped(&p->overlapped);
p->userdata = 2;
p->queue_cb = this;
WSABUF wsabuf = {(ULONG)p->size, (char*)p->data};
int rv;
if (p->addr.sin.sin_family == AF_INET) {
rv = WSASendTo(socket_, &wsabuf, 1, NULL, 0, (struct sockaddr*)&p->addr.sin, sizeof(p->addr.sin), &p->overlapped, NULL);
} else {
if (socket_ipv6_ == INVALID_SOCKET) {
RERROR("UdpSocketWin32: unavailable ipv6 socket");
FreePacket(p);
continue;
}
max_read_ipv6_ = kConcurrentReadUdp;
rv = WSASendTo(socket_ipv6_, &wsabuf, 1, NULL, 0, (struct sockaddr*)&p->addr.sin6, sizeof(p->addr.sin6), &p->overlapped, NULL);
}
if (rv != 0) {
DWORD err = WSAGetLastError();
if (err != ERROR_IO_PENDING) {
RERROR("UdpSocketWin32: WSASendTo failed 0x%X", err);
FreePacket(p);
continue;
}
}
num_writes_++;
}
pending_writes_ = pending_writes;
}
void UdpSocketWin32::CancelAllIO() {
CancelIo((HANDLE)socket_);
CancelIo((HANDLE)socket_ipv6_);
FreePacketList(pending_writes_);
}
bool UdpSocketWin32::HasOutstandingIO() {
return (num_reads_[IPV4] + num_reads_[IPV6] + num_writes_) != 0;
}
void UdpSocketWin32::OnQueuedItemEvent(QueuedItem *qi, uintptr_t extra) {
Packet *p = static_cast<Packet*>(qi);
if (p->userdata < 2) {
num_reads_[p->userdata]--;
if ((DWORD)p->overlapped.Internal != 0) {
if (!IsIgnoredUdpError((DWORD)p->overlapped.Internal))
RERROR("UdpSocketWin32::Read error 0x%X", (DWORD)p->overlapped.Internal);
network_->packet_pool().FreePacketToPool(p);
} else {
// Remember all the finished packets and queue them up to the next thread once we've
// collected them all.
p->size = (int)p->overlapped.InternalHigh;
p->protocol = kPacketProtocolUdp;
p->queue_cb = packet_handler_->udp_queue();
p->queue_next = NULL;
*finished_reads_end_ = p;
finished_reads_end_ = &Packet_NEXT(p);
finished_reads_count_++;
}
} else {
num_writes_--;
if ((DWORD)p->overlapped.Internal != 0)
RERROR("UdpSocketWin32::Write error 0x%X", (DWORD)p->overlapped.Internal);
network_->packet_pool().FreePacketToPool(p);
}
}
void UdpSocketWin32::OnQueuedItemDelete(QueuedItem *qi) {
Packet *p = static_cast<Packet*>(qi);
if (p->userdata < 2) {
num_reads_[p->userdata]--;
} else {
num_writes_--;
}
network_->packet_pool().FreePacketToPool(p);
}
void UdpSocketWin32::DoIO() {
DoMoreWrites();
ProcessPackets();
DoMoreReads();
}
////////////////////////////////////////////////////////////////////////////////////////////////////////
NetworkWin32::NetworkWin32() : udp_socket_(this) {
exit_thread_ = false;
thread_ = NULL;
completion_port_handle_ = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, NULL, 0);
tcp_socket_ = NULL;
}
NetworkWin32::~NetworkWin32() {
assert(thread_ == NULL);
for (TcpSocketWin32 *socket = tcp_socket_; socket; )
delete exch(socket, socket->next_);
CloseHandle(completion_port_handle_);
}
DWORD WINAPI NetworkWin32::NetworkThread(void *x) {
NetworkWin32 *net = (NetworkWin32 *)x;
net->ThreadMain();
return 0;
}
void NetworkWin32::ThreadMain() {
OVERLAPPED_ENTRY entries[kUdpGetQueuedCompletionStatusSize];
while (!exit_thread_) {
// TODO: In the future, don't process every socket here, only
// those sockets that requested it.
udp_socket_.DoIO();
for (TcpSocketWin32 *tcp = tcp_socket_; tcp;)
exch(tcp, tcp->next_)->DoIO();
packet_pool_.FreeSomePackets();
ULONG num_entries = 0;
if (!GetQueuedCompletionStatusEx(completion_port_handle_, entries, kUdpGetQueuedCompletionStatusSize, &num_entries, INFINITE, FALSE)) {
RINFO("GetQueuedCompletionStatusEx failed.");
break;
}
for (ULONG i = 0; i < num_entries; i++) {
if (entries[i].lpOverlapped) {
QueuedItem *w = (QueuedItem*)((byte*)entries[i].lpOverlapped - offsetof(QueuedItem, overlapped));
w->queue_cb->OnQueuedItemEvent(w, 0);
}
}
}
udp_socket_.CancelAllIO();
for (TcpSocketWin32 *tcp = tcp_socket_; tcp; tcp = tcp->next_)
tcp->CancelAllIO();
while (HasOutstandingIO()) {
ULONG num_entries = 0;
if (!GetQueuedCompletionStatusEx(completion_port_handle_, entries, kUdpGetQueuedCompletionStatusSize, &num_entries, INFINITE, FALSE)) {
RINFO("GetQueuedCompletionStatusEx failed.");
break;
}
for (ULONG i = 0; i < num_entries; i++) {
if (entries[i].lpOverlapped) {
QueuedItem *w = (QueuedItem*)((byte*)entries[i].lpOverlapped - offsetof(QueuedItem, overlapped));
w->queue_cb->OnQueuedItemDelete(w);
}
}
}
}
bool NetworkWin32::HasOutstandingIO() {
if (udp_socket_.HasOutstandingIO())
return true;
for (TcpSocketWin32 *tcp = tcp_socket_; tcp; tcp = tcp->next_)
if (tcp->HasOutstandingIO())
return true;
return false;
}
void NetworkWin32::StartThread() {
assert(completion_port_handle_);
DWORD thread_id;
thread_ = CreateThread(NULL, 0, &NetworkThread, this, 0, &thread_id);
SetThreadPriority(thread_, ABOVE_NORMAL_PRIORITY_CLASS);
}
void NetworkWin32::StopThread() {
if (thread_ != NULL) {
exit_thread_ = true;
g_fail_malloc_flag = true;
PostQueuedCompletionStatus(completion_port_handle_, NULL, NULL, NULL);
WaitForSingleObject(thread_, INFINITE);
CloseHandle(thread_);
thread_ = NULL;
exit_thread_ = false;
g_fail_malloc_flag = false;
}
}
void NetworkWin32::WakeUp() {
PostQueuedCompletionStatus(completion_port_handle_, NULL, NULL, NULL);
}
void NetworkWin32::PostQueuedItem(QueuedItem *item) {
PostQueuedCompletionStatus(completion_port_handle_, NULL, NULL, &item->overlapped);
}
/////////////////////////////////////////////////////////////////////////
PacketProcessor::PacketProcessor() {
event_ = CreateEvent(NULL, FALSE, FALSE, NULL);
last_ptr_ = &first_;
first_ = NULL;
exit_code_ = 0;
timer_interrupt_ = false;
packets_in_queue_ = 0;
need_notify_ = 0;
udp_cb_maybe_deobfuscate_ = &udp_cb_;
}
PacketProcessor::~PacketProcessor() {
first_ = NULL;
last_ptr_ = &first_;
CloseHandle(event_);
}
void CALLBACK PacketProcessor::ThreadPoolTimerCallback(PTP_CALLBACK_INSTANCE iTimerInstance, PVOID pContext, PTP_TIMER) {
PacketProcessor *th = (PacketProcessor *)pContext;
th->mutex_.Acquire();
th->timer_interrupt_ = true;
if (th->need_notify_) {
th->need_notify_ = 0;
th->mutex_.Release();
SetEvent(th->event_);
return;
}
th->mutex_.Release();
}
void PacketProcessor::Reset() {
QueuedItem *packet;
packet = first_;
first_ = NULL;
exit_code_ = 0;
last_ptr_ = &first_;
timer_interrupt_ = false;
while (packet) {
QueuedItem *next = packet->queue_next;
packet->queue_cb->OnQueuedItemDelete(packet);
packet = next;
}
}
int PacketProcessor::Run(WireguardProcessor *wg, TunsafeRunner *runner) {
int free_packets_ctr = 0;
int overload = 0;
int exit_code;
QueuedItem *packet;
PTP_TIMER threadpool_timer;
QueueContext queue_context = {wg, runner};
threadpool_timer = CreateThreadpoolTimer(&ThreadPoolTimerCallback, this, NULL);
static const int64 duetime = -10000000; // the unit is 100ns
SetThreadpoolTimer(threadpool_timer, (FILETIME*)&duetime, 1000, 1000);
mutex_.Acquire();
while (!(exit_code = exit_code_)) {
if (timer_interrupt_) {
timer_interrupt_ = false;
need_notify_ = 0;
mutex_.Release();
wg->SecondLoop();
runner->CollectStats();
// Conserve memory every 10s
if (free_packets_ctr++ == 10) {
free_packets_ctr = 0;
FreeAllPackets();
}
if (overload)
overload -= 1;
} else if ((packet = first_) == NULL) {
need_notify_ = 1;
mutex_.Release();
WaitForSingleObject(event_, INFINITE);
} else {
// Steal the whole work queue
first_ = NULL;
last_ptr_ = &first_;
int packets_in_queue = packets_in_queue_;
packets_in_queue_ = 0;
need_notify_ = 0;
mutex_.Release();
if (packets_in_queue >= 1024)
overload = 2;
queue_context.overload = (overload != 0);
do {
QueuedItem *next = packet->queue_next;
packet->queue_cb->OnQueuedItemEvent(packet, (uintptr_t)&queue_context);
packet = next;
} while (packet);
}
wg->RunAllMainThreadScheduled();
mutex_.Acquire();
}
mutex_.Release();
SetThreadpoolTimer(threadpool_timer, nullptr, 0, 0);
WaitForThreadpoolTimerCallbacks(threadpool_timer, true);
CloseThreadpoolTimer(threadpool_timer);
return exit_code;
}
void PacketProcessorTunCb::OnQueuedItemEvent(QueuedItem *qi, uintptr_t extra) {
PacketProcessor::QueueContext *context = (PacketProcessor::QueueContext *)extra;
context->wg->HandleTunPacket(static_cast<Packet*>(qi));
}
void PacketProcessorTunCb::OnQueuedItemDelete(QueuedItem *qi) {
FreePacket(static_cast<Packet*>(qi));
}
void PacketProcessorUdpCb::OnQueuedItemEvent(QueuedItem *qi, uintptr_t extra) {
PacketProcessor::QueueContext *context = (PacketProcessor::QueueContext *)extra;
context->wg->HandleUdpPacket(static_cast<Packet*>(qi), context->overload);
}
void PacketProcessorUdpCb::OnQueuedItemDelete(QueuedItem *qi) {
FreePacket(static_cast<Packet*>(qi));
}
void PacketProcessorDeobfuscateUdpCb::OnQueuedItemEvent(QueuedItem *qi, uintptr_t extra) {
PacketProcessor::QueueContext *context = (PacketProcessor::QueueContext *)extra;
Packet *packet = static_cast<Packet*>(qi);
context->wg->dev().packet_obfuscator().DeobfuscatePacket(packet);
PacketProcessorUdpCb::OnQueuedItemEvent(qi, extra);
}
void PacketProcessor::PostExit(int exit_code) {
mutex_.Acquire();
exit_code_ = exit_code;
mutex_.Release();
SetEvent(event_);
}
void PacketProcessor::PostPackets(Packet *first, Packet **end, int count) {
mutex_.Acquire();
if (packets_in_queue_ >= HARD_MAXIMUM_QUEUE_SIZE) {
mutex_.Release();
FreePackets(first, end, count);
return;
}
assert(first != NULL);
assert(first_ || last_ptr_ == &first_);
packets_in_queue_ += count;
*last_ptr_ = first;
last_ptr_ = (QueuedItem**)end;
assert(first_ || last_ptr_ == &first_);
if (need_notify_) {
need_notify_ = 0;
mutex_.Release();
SetEvent(event_);
return;
}
mutex_.Release();
}
void PacketProcessor::ForcePost(QueuedItem *item) {
item->queue_next = NULL;
mutex_.Acquire();
packets_in_queue_ += 1;
*last_ptr_ = item;
last_ptr_ = &item->queue_next;
if (need_notify_) {
need_notify_ = 0;
mutex_.Release();
SetEvent(event_);
return;
}
mutex_.Release();
}
bool GetNetLuidFromGuid(const char *adapter_guid, NET_LUID *luid) {
char buffer[64];
UUID uuid;
size_t len = strlen(adapter_guid);
if (adapter_guid[0] != '{' || adapter_guid[len - 1] != '}' || len >= 64) return false;
buffer[len - 2] = 0;
memcpy(buffer, adapter_guid + 1, len - 2);
RPC_STATUS status = UuidFromStringA((RPC_CSTR)buffer, &uuid);
if (status != 0)
return false;
return ConvertInterfaceGuidToLuid((GUID*)&uuid, luid) == 0;
}
DWORD SetMtuOnNetworkAdapter(NET_LUID *InterfaceLuid, ADDRESS_FAMILY family, int new_mtu) {
MIB_IPINTERFACE_ROW row;
DWORD err;
InitializeIpInterfaceEntry(&row);
row.Family = family;
row.InterfaceLuid = *InterfaceLuid;
if ((err = GetIpInterfaceEntry(&row)) == 0) {