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peer.cpp
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peer.cpp
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/*
* ovpn-dco-win OpenVPN protocol accelerator for Windows
*
* Copyright (C) 2020-2021 OpenVPN Inc <[email protected]>
* Copyright (C) 2023 Rubicon Communications LLC (Netgate)
*
* Author: Lev Stipakov <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <ntifs.h>
#include "trace.h"
#include "peer.h"
#include "timer.h"
#include "socket.h"
_Use_decl_annotations_
OvpnPeerContext*
OvpnPeerCtxAlloc()
{
OvpnPeerContext* peer = (OvpnPeerContext*)ExAllocatePool2(POOL_FLAG_NON_PAGED, sizeof(OvpnPeerContext), 'ovpn');
if (peer != NULL) {
RtlZeroMemory(peer, sizeof(OvpnPeerContext));
}
return peer;
}
_Use_decl_annotations_
VOID
OvpnPeerCtxFree(OvpnPeerContext* peer)
{
OvpnCryptoUninit(&peer->CryptoContext);
OvpnTimerDestroy(&peer->KeepaliveXmitTimer);
OvpnTimerDestroy(&peer->KeepaliveRecvTimer);
ExFreePoolWithTag(peer, 'ovpn');
}
_Use_decl_annotations_
PVOID
OvpnPeerAllocateRoutine(_RTL_GENERIC_TABLE* table, CLONG size)
{
UNREFERENCED_PARAMETER(table);
return ExAllocatePool2(POOL_FLAG_NON_PAGED, size, 'ovpn');
}
_Use_decl_annotations_
VOID
OvpnPeerFreeRoutine(_RTL_GENERIC_TABLE* table, PVOID buffer)
{
UNREFERENCED_PARAMETER(table);
ExFreePoolWithTag(buffer, 'ovpn');
}
RTL_GENERIC_COMPARE_RESULTS OvpnPeerCompareByPeerIdRoutine(_RTL_GENERIC_TABLE* table, PVOID first, PVOID second)
{
UNREFERENCED_PARAMETER(table);
UNREFERENCED_PARAMETER(first);
UNREFERENCED_PARAMETER(second);
return GenericEqual;
}
static
VOID
OvpnPeerZeroStats(POVPN_STATS stats)
{
InterlockedExchange(&stats->LostInControlPackets, 0);
InterlockedExchange(&stats->LostInDataPackets, 0);
InterlockedExchange(&stats->LostOutControlPackets, 0);
InterlockedExchange(&stats->LostOutDataPackets, 0);
InterlockedExchange(&stats->ReceivedControlPackets, 0);
InterlockedExchange(&stats->ReceivedDataPackets, 0);
InterlockedExchange(&stats->SentControlPackets, 0);
InterlockedExchange(&stats->SentDataPackets, 0);
InterlockedExchange64(&stats->TransportBytesReceived, 0);
InterlockedExchange64(&stats->TransportBytesSent, 0);
InterlockedExchange64(&stats->TunBytesReceived, 0);
InterlockedExchange64(&stats->TunBytesSent, 0);
}
_Use_decl_annotations_
NTSTATUS
OvpnPeerNew(POVPN_DEVICE device, WDFREQUEST request)
{
LOG_ENTER();
POVPN_NEW_PEER peer = NULL;
NTSTATUS status;
GOTO_IF_NOT_NT_SUCCESS(done, status, WdfRequestRetrieveInputBuffer(request, sizeof(OVPN_NEW_PEER), (PVOID*)&peer, nullptr));
KIRQL kirql = ExAcquireSpinLockExclusive(&device->SpinLock);
const BOOLEAN peerExists = OvpnHasPeers(device);
ExReleaseSpinLockExclusive(&device->SpinLock, kirql);
if (peerExists) {
LOG_WARN("Peer already exists");
status = STATUS_OBJECTID_EXISTS;
goto done;
}
POVPN_DRIVER driver = OvpnGetDriverContext(WdfGetDriver());
PWSK_SOCKET socket = NULL;
BOOLEAN proto_tcp = peer->Proto == OVPN_PROTO_TCP;
SIZE_T remoteAddrSize = peer->Remote.Addr4.sin_family == AF_INET ? sizeof(peer->Remote.Addr4) : sizeof(peer->Remote.Addr6);
OvpnPeerContext* peerCtx = OvpnPeerCtxAlloc();
if (peerCtx == NULL) {
status = STATUS_NO_MEMORY;
goto done;
}
GOTO_IF_NOT_NT_SUCCESS(done, status, OvpnSocketInit(&driver->WskProviderNpi,
&driver->WskRegistration, peer->Local.Addr4.sin_family, proto_tcp,
(PSOCKADDR)&peer->Local,
(PSOCKADDR)&peer->Remote,
remoteAddrSize, device, &socket));
kirql = ExAcquireSpinLockExclusive(&device->SpinLock);
LOG_IF_NOT_NT_SUCCESS(status = OvpnAddPeer(device, peerCtx));
if (status != STATUS_SUCCESS) {
ExReleaseSpinLockExclusive(&device->SpinLock, kirql);
OvpnPeerCtxFree(peerCtx);
LOG_IF_NOT_NT_SUCCESS(OvpnSocketClose(socket));
}
else {
device->Socket.Socket = socket;
device->Socket.Tcp = proto_tcp;
RtlZeroMemory(&device->Socket.TcpState, sizeof(OvpnSocketTcpState));
RtlZeroMemory(&device->Socket.UdpState, sizeof(OvpnSocketUdpState));
ExReleaseSpinLockExclusive(&device->SpinLock, kirql);
OvpnPeerZeroStats(&device->Stats);
if (proto_tcp) {
LOG_IF_NOT_NT_SUCCESS(status = WdfRequestForwardToIoQueue(request, device->PendingNewPeerQueue));
// start async connect
status = OvpnSocketTcpConnect(socket, device, (PSOCKADDR)&peer->Remote);
}
}
done:
LOG_EXIT();
return status;
}
_Use_decl_annotations_
NTSTATUS
OvpnPeerDel(POVPN_DEVICE device)
{
LOG_ENTER();
KIRQL kirql = ExAcquireSpinLockExclusive(&device->SpinLock);
PWSK_SOCKET socket = device->Socket.Socket;
device->Socket.Socket = NULL;
OvpnFlushPeers(device);
RtlZeroMemory(&device->Socket.TcpState, sizeof(OvpnSocketTcpState));
RtlZeroMemory(&device->Socket.UdpState, sizeof(OvpnSocketUdpState));
// OvpnSocketClose requires PASSIVE_LEVEL, so must release lock
ExReleaseSpinLockExclusive(&device->SpinLock, kirql);
LOG_IF_NOT_NT_SUCCESS(OvpnSocketClose(socket));
// flush buffers in control queue so that client won't get control channel messages from previous session
while (LIST_ENTRY* entry = OvpnBufferQueueDequeue(device->ControlRxBufferQueue)) {
OVPN_RX_BUFFER* buffer = CONTAINING_RECORD(entry, OVPN_RX_BUFFER, QueueListEntry);
// return buffer back to pool
OvpnRxBufferPoolPut(buffer);
}
WDFREQUEST request;
while (NT_SUCCESS(WdfIoQueueRetrieveNextRequest(device->PendingReadsQueue, &request))) {
ULONG_PTR bytesCopied = 0;
LOG_INFO("Cancel IO request from manual queue");
WdfRequestCompleteWithInformation(request, STATUS_CANCELLED, bytesCopied);
}
LOG_EXIT();
return STATUS_SUCCESS;
}
_Use_decl_annotations_
NTSTATUS OvpnPeerSet(POVPN_DEVICE device, WDFREQUEST request)
{
LOG_ENTER();
NTSTATUS status = STATUS_SUCCESS;
OvpnPeerContext* peer = OvpnGetFirstPeer(&device->Peers);
if (peer == NULL) {
LOG_ERROR("Peer not added");
status = STATUS_INVALID_DEVICE_REQUEST;
goto done;
}
POVPN_SET_PEER set_peer = NULL;
GOTO_IF_NOT_NT_SUCCESS(done, status, WdfRequestRetrieveInputBuffer(request, sizeof(OVPN_SET_PEER), (PVOID*)&set_peer, nullptr));
LOG_INFO("Set peer", TraceLoggingValue(set_peer->KeepaliveInterval, "interval"),
TraceLoggingValue(set_peer->KeepaliveTimeout, "timeout"),
TraceLoggingValue(set_peer->MSS, "MSS"));
if (set_peer->MSS != -1) {
device->MSS = (UINT16)set_peer->MSS;
}
if (set_peer->KeepaliveInterval != -1) {
peer->KeepaliveInterval = set_peer->KeepaliveInterval;
if (peer->KeepaliveInterval > 0) {
// keepalive xmit timer, sends ping packets
GOTO_IF_NOT_NT_SUCCESS(done, status, OvpnTimerXmitCreate(device->WdfDevice, peer, peer->KeepaliveInterval, &peer->KeepaliveXmitTimer));
OvpnTimerReset(peer->KeepaliveXmitTimer, peer->KeepaliveInterval);
}
else {
LOG_INFO("Destroy xmit timer");
OvpnTimerDestroy(&peer->KeepaliveXmitTimer);
}
}
if (peer->KeepaliveTimeout != -1) {
peer->KeepaliveTimeout = set_peer->KeepaliveTimeout;
if (peer->KeepaliveTimeout > 0) {
// keepalive recv timer, detects keepalive timeout
GOTO_IF_NOT_NT_SUCCESS(done, status, OvpnTimerRecvCreate(device->WdfDevice, peer, &peer->KeepaliveRecvTimer));
OvpnTimerReset(peer->KeepaliveRecvTimer, peer->KeepaliveTimeout);
}
else {
LOG_INFO("Destroy recv timer");
OvpnTimerDestroy(&peer->KeepaliveRecvTimer);
}
}
done:
LOG_EXIT();
return status;
}
_Use_decl_annotations_
NTSTATUS
OvpnPeerGetStats(POVPN_DEVICE device, WDFREQUEST request, ULONG_PTR* bytesReturned)
{
NTSTATUS status = STATUS_SUCCESS;
OvpnPeerContext* peer = OvpnGetFirstPeer(&device->Peers);
if (peer == NULL) {
LOG_ERROR("Peer not added");
status = STATUS_INVALID_DEVICE_REQUEST;
goto done;
}
POVPN_STATS stats = NULL;
GOTO_IF_NOT_NT_SUCCESS(done, status, WdfRequestRetrieveOutputBuffer(request, sizeof(OVPN_STATS), (PVOID*)&stats, NULL));
stats->LostInControlPackets = InterlockedCompareExchangeNoFence(&device->Stats.LostInControlPackets, 0, 0);
stats->LostInDataPackets = InterlockedCompareExchangeNoFence(&device->Stats.LostInDataPackets, 0, 0);
stats->LostOutControlPackets = InterlockedCompareExchangeNoFence(&device->Stats.LostOutControlPackets, 0, 0);
stats->LostOutDataPackets = InterlockedCompareExchangeNoFence(&device->Stats.LostOutDataPackets, 0, 0);
stats->ReceivedControlPackets = InterlockedCompareExchangeNoFence(&device->Stats.ReceivedControlPackets, 0, 0);
stats->ReceivedDataPackets = InterlockedCompareExchangeNoFence(&device->Stats.ReceivedDataPackets, 0, 0);
stats->SentControlPackets = InterlockedCompareExchangeNoFence(&device->Stats.SentControlPackets, 0, 0);
stats->SentDataPackets = InterlockedCompareExchangeNoFence(&device->Stats.SentDataPackets, 0, 0);
stats->TransportBytesReceived = InterlockedCompareExchangeNoFence64(&device->Stats.TransportBytesReceived, 0, 0);
stats->TransportBytesSent = InterlockedCompareExchangeNoFence64(&device->Stats.TransportBytesSent, 0, 0);
stats->TunBytesReceived = InterlockedCompareExchangeNoFence64(&device->Stats.TunBytesReceived, 0, 0);
stats->TunBytesSent = InterlockedCompareExchangeNoFence64(&device->Stats.TunBytesSent, 0, 0);
*bytesReturned = sizeof(OVPN_STATS);
done:
return status;
}
_Use_decl_annotations_
NTSTATUS
OvpnPeerStartVPN(POVPN_DEVICE device)
{
LOG_ENTER();
NTSTATUS status = STATUS_SUCCESS;
if (!OvpnHasPeers(device)) {
LOG_ERROR("Peer not added");
status = STATUS_INVALID_DEVICE_REQUEST;
goto done;
}
OvpnAdapterSetLinkState(OvpnGetAdapterContext(device->Adapter), MediaConnectStateConnected);
done:
LOG_EXIT();
return status;
}
_Use_decl_annotations_
NTSTATUS
OvpnPeerNewKey(POVPN_DEVICE device, WDFREQUEST request)
{
LOG_ENTER();
NTSTATUS status = STATUS_SUCCESS;
if (!OvpnHasPeers(device)) {
LOG_ERROR("Peer not added");
status = STATUS_INVALID_DEVICE_REQUEST;
goto done;
}
POVPN_CRYPTO_DATA cryptoData = NULL;
GOTO_IF_NOT_NT_SUCCESS(done, status, WdfRequestRetrieveInputBuffer(request, sizeof(OVPN_CRYPTO_DATA), (PVOID*)&cryptoData, nullptr));
BCRYPT_ALG_HANDLE algHandle = NULL;
switch (cryptoData->CipherAlg) {
case OVPN_CIPHER_ALG_AES_GCM:
algHandle = device->AesAlgHandle;
device->CryptoOverhead = AEAD_CRYPTO_OVERHEAD;
break;
case OVPN_CIPHER_ALG_CHACHA20_POLY1305:
algHandle = device->ChachaAlgHandle;
if (algHandle == NULL) {
LOG_ERROR("CHACHA20-POLY1305 is not available");
status = STATUS_INVALID_DEVICE_REQUEST;
goto done;
}
device->CryptoOverhead = AEAD_CRYPTO_OVERHEAD;
default:
device->CryptoOverhead = NONE_CRYPTO_OVERHEAD;
break;
}
OvpnPeerContext* peer = OvpnGetFirstPeer(&device->Peers);
if (peer == NULL) {
status = STATUS_OBJECTID_NOT_FOUND;
goto done;
}
GOTO_IF_NOT_NT_SUCCESS(done, status, OvpnCryptoNewKey(&peer->CryptoContext, cryptoData, algHandle));
done:
LOG_EXIT();
return status;
}
_Use_decl_annotations_
NTSTATUS
OvpnPeerSwapKeys(POVPN_DEVICE device)
{
LOG_ENTER();
NTSTATUS status = STATUS_SUCCESS;
if (!OvpnHasPeers(device)) {
LOG_ERROR("Peer not added");
status = STATUS_INVALID_DEVICE_REQUEST;
goto done;
}
OvpnPeerContext* peer = OvpnGetFirstPeer(&device->Peers);
if (peer == NULL) {
LOG_ERROR("Peer not found");
status = STATUS_INVALID_DEVICE_REQUEST;
goto done;
}
OvpnCryptoSwapKeys(&peer->CryptoContext);
done:
LOG_EXIT();
return status;
}