/*
* windivert.c
* (C) 2018, all rights reserved,
*
* This file is part of WinDivert.
*
* WinDivert is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see .
*
* WinDivert is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* 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
#include
#include
#include
#include
#include
#include
#define INITGUID
#include
#include "windivert_device.h"
/*
* WDK function declaration cruft.
*/
DRIVER_INITIALIZE DriverEntry;
EVT_WDF_DRIVER_UNLOAD windivert_unload;
EVT_WDF_IO_IN_CALLER_CONTEXT windivert_caller_context;
EVT_WDF_IO_QUEUE_IO_DEVICE_CONTROL windivert_ioctl;
EVT_WDF_DEVICE_FILE_CREATE windivert_create;
EVT_WDF_FILE_CLEANUP windivert_cleanup;
EVT_WDF_FILE_CLOSE windivert_close;
EVT_WDF_OBJECT_CONTEXT_DESTROY windivert_destroy;
EVT_WDF_WORKITEM windivert_worker;
EVT_WDF_WORKITEM windivert_reflect_worker;
/*
* Debugging macros.
*/
#define DEBUG_ON
#define DEBUG_BUFSIZE 256
#ifdef DEBUG_ON
static void DEBUG(PCCH format, ...)
{
va_list args;
char buf[DEBUG_BUFSIZE+1];
if (KeGetCurrentIrql() != PASSIVE_LEVEL)
{
return;
}
va_start(args, format);
RtlStringCbVPrintfA(buf, DEBUG_BUFSIZE, format, args);
DbgPrint("WINDIVERT: %s\n", buf);
va_end(args);
}
static void DEBUG_ERROR(PCCH format, NTSTATUS status, ...)
{
va_list args;
char buf[DEBUG_BUFSIZE+1];
if (KeGetCurrentIrql() != PASSIVE_LEVEL)
{
return;
}
va_start(args, status);
RtlStringCbVPrintfA(buf, DEBUG_BUFSIZE, format, args);
DbgPrint("WINDIVERT: *** ERROR ***: (status = %x): %s\n", status, buf);
va_end(args);
}
#else // DEBUG_ON
#define DEBUG(format, ...)
#define DEBUG_ERROR(format, status, ...)
#endif
#define WINDIVERT_TAG 'viDW'
/*
* WinDivert reflect event.
*/
typedef struct context_s *context_t;
struct reflect_event_s
{
LIST_ENTRY entry; // Entry.
context_t context; // Context.
WINDIVERT_EVENT event; // Event.
};
typedef struct reflect_event_s *reflect_event_t;
/*
* WinDivert reflect context information.
*/
struct reflect_context_s
{
LIST_ENTRY entry; // Open handle entry.
LONGLONG timestamp; // Open timestamp.
WINDIVERT_DATA_REFLECT data; // Reflect data.
struct reflect_event_s open_event; // Open event.
struct reflect_event_s close_event; // Close event
BOOL open; // Seen open event?
};
/*
* WinDivert context information.
*/
#define WINDIVERT_CONTEXT_SIZE (sizeof(struct context_s))
#define WINDIVERT_CONTEXT_MAXLAYERS 8
typedef enum
{
WINDIVERT_CONTEXT_STATE_OPENING = 0xA0, // Context is opening.
WINDIVERT_CONTEXT_STATE_OPEN = 0xB1, // Context is open.
WINDIVERT_CONTEXT_STATE_CLOSING = 0xC2, // Context is closing.
WINDIVERT_CONTEXT_STATE_CLOSED = 0xD3, // Context is closed.
WINDIVERT_CONTEXT_STATE_INVALID = 0xE4 // Context is invalid.
} context_state_t;
struct context_s
{
context_state_t state; // Context's state.
KSPIN_LOCK lock; // Context-wide lock.
WDFDEVICE device; // Context's device.
WDFFILEOBJECT object; // Context's parent object.
LIST_ENTRY flow_set; // All active flows.
UINT32 flow_v4_callout_id; // Flow established callout id.
UINT32 flow_v6_callout_id; // Flow established callout id.
LIST_ENTRY work_queue; // Work queue.
ULONG work_queue_length; // Work queue length.
LIST_ENTRY packet_queue; // Packet queue.
ULONG packet_queue_length; // Packet queue length.
ULONG packet_queue_maxlength; // Packet queue max length.
ULONG packet_queue_size; // Packet queue size (in bytes).
ULONG packet_queue_maxsize; // Packet queue max size.
LONGLONG packet_queue_maxcounts; // Packet queue max counts.
ULONG packet_queue_maxtime; // Packet queue max time.
WDFQUEUE read_queue; // Read queue.
WDFWORKITEM worker; // Read worker.
WINDIVERT_LAYER layer; // Context's layer.
UINT64 flags; // Context's flags.
BOOL shutdown_recv; // Shutdown recv.
BOOL shutdown_send; // Shutdown send.
BOOL shutdown_recv_enabled; // Shutdown recv enabled?
UINT32 priority; // Context (internal) priority.
INT16 priority16; // Context (user) priority.
GUID callout_guid[WINDIVERT_CONTEXT_MAXLAYERS];
// Callout GUIDs.
GUID filter_guid[WINDIVERT_CONTEXT_MAXLAYERS];
// Filter GUIDs.
BOOL installed[WINDIVERT_CONTEXT_MAXLAYERS];// What is installed?
HANDLE engine_handle; // WFP engine handle.
const WINDIVERT_FILTER *filter; // Packet filter.
UINT16 filter_len; // Length of filter.
UINT64 filter_flags; // Filter flags.
struct reflect_context_s reflect; // Reflection info.
};
typedef struct context_s context_s;
WDF_DECLARE_CONTEXT_TYPE_WITH_NAME(context_s, windivert_context_get);
#define WINDIVERT_TIMEOUT(context, t0, t1) \
((context)->layer == WINDIVERT_LAYER_NETWORK || \
(context)->layer == WINDIVERT_LAYER_NETWORK_FORWARD? \
((t1) >= (t0)? (t1) - (t0): (t0) - (t1)) > \
(context)->packet_queue_maxcounts: FALSE)
/*
* WinDivert Layer information.
*/
typedef void (*windivert_classify_t)(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result);
typedef void (*windivert_flow_delete_notify_t)(
IN UINT16 layer_id, IN UINT32 callout_id, IN UINT64 flow_context);
struct layer_s
{
wchar_t *sublayer_name; // Sub-layer name.
wchar_t *sublayer_desc; // Sub-layer description.
wchar_t *callout_name; // Call-out name.
wchar_t *callout_desc; // Call-out description.
wchar_t *filter_name; // Filter name.
wchar_t *filter_desc; // Filter description.
const GUID *layer_guid; // WFP layer GUID.
const GUID *sublayer_guid; // Sub-layer GUID.
windivert_classify_t classify; // Classify function.
windivert_flow_delete_notify_t flow_delete;
// Flow delete function.
UINT16 sublayer_weight; // Sub-layer weight.
};
typedef const struct layer_s *layer_t;
/*
* WinDivert request context.
*/
struct req_context_s
{
PWINDIVERT_ADDRESS addr; // Pointer to address structure.
UINT *addr_len_ptr; // Pointer to address length.
UINT addr_len; // Address length (in bytes).
};
typedef struct req_context_s req_context_s;
typedef struct req_context_s *req_context_t;
WDF_DECLARE_CONTEXT_TYPE_WITH_NAME(req_context_s, windivert_req_context_get);
/*
* WinDivert packet structure. Layout is as follows:
*
* +-----------------+------------+-------------+
* | struct packet_s | layer data | packet data |
* +-----------------+------------+-------------+
*
* Note the packet data must be pointer-aligned.
*/
#define WINDIVERT_WORK_QUEUE_LEN_MAX 4096
#ifdef _WIN64
#define WINDIVERT_ALIGN_SIZE 8
#define WINDIVERT_DATA_ALIGN __declspec(align(8))
#else
#define WINDIVERT_ALIGN_SIZE 4
#define WINDIVERT_DATA_ALIGN __declspec(align(4))
#endif
struct packet_s
{
LIST_ENTRY entry; // Entry for queue.
LONGLONG timestamp; // Packet timestamp.
UINT64 layer:8; // Layer.
UINT64 event:8; // Event.
UINT64 outbound:1; // Packet is outound?
UINT64 loopback:1; // Packet is loopback?
UINT64 impostor:1; // Packet is impostor?
UINT64 ipv6:1; // Packet is IPv6?
UINT64 pseudo_ip_checksum:1; // Packet has pseudo IPv4 check?
UINT64 pseudo_tcp_checksum:1; // Packet has pseudo TCP check?
UINT64 pseudo_udp_checksum:1; // Packet has pseudo UDP check?
UINT64 match:1; // Packet matches filter?
UINT32 priority; // Packet priority.
UINT32 packet_len; // Length of the packet.
WINDIVERT_DATA_ALIGN UINT8 data[]; // Packet/layer data.
};
typedef struct packet_s *packet_t;
#define WINDIVERT_DATA_SIZE(size) \
((((size) + WINDIVERT_ALIGN_SIZE - 1) / WINDIVERT_ALIGN_SIZE) * \
WINDIVERT_ALIGN_SIZE)
#define WINDIVERT_PACKET_SIZE(layer_type, packet_len) \
(sizeof(struct packet_s) + WINDIVERT_DATA_SIZE(sizeof(layer_type)) + \
(packet_len))
#define WINDIVERT_LAYER_DATA_PTR(packet) \
((packet)->data)
#define WINDIVERT_PACKET_DATA_PTR(layer_type, packet) \
((packet)->data + WINDIVERT_DATA_SIZE(sizeof(layer_type)))
/*
* WinDivert flow structure.
*/
struct flow_s
{
LIST_ENTRY entry; // Entry for tracking.
context_t context; // Context.
UINT64 flow_id; // WFP flow ID.
UINT32 callout_id; // WFP callout ID.
UINT16 layer_id; // WFP layout ID.
BOOL inserted:1; // Flow inserted into context?
BOOL deleted:1; // Flow deleted from context?
BOOL outbound:1; // Flow is outound?
BOOL loopback:1; // Flow is loopback?
BOOL ipv6:1; // Flow is ipv6?
WINDIVERT_DATA_FLOW data; // Flow data.
};
typedef struct flow_s *flow_t;
/*
* Misc.
*/
#define UINT8_MAX 0xFF
#define UINT16_MAX 0xFFFF
#define UINT32_MAX 0xFFFFFFFF
/*
* Global state.
*/
static HANDLE inject_handle = NULL;
static HANDLE injectv6_handle = NULL;
static NDIS_HANDLE nbl_pool_handle = NULL;
static NDIS_HANDLE nb_pool_handle = NULL;
static HANDLE engine_handle = NULL;
static LONG priority_counter = 0;
static LONGLONG counts_per_ms = 0;
static POOL_TYPE non_paged_pool = NonPagedPool;
static MM_PAGE_PRIORITY no_write_flag = 0;
static MM_PAGE_PRIORITY no_exec_flag = 0;
/*
* Priorities & weights.
*/
static UINT32 windivert_context_priority(INT64 priority64)
{
UINT32 priority, increment;
priority64 += WINDIVERT_PRIORITY_MAX; // Make positive
priority = (UINT32)(priority64 << 16);
increment = (UINT32)InterlockedIncrement(&priority_counter);
priority |= (increment & 0x0000FFFF);
return priority;
}
#define WINDIVERT_FILTER_WEIGHT(priority) \
((UINT64)((UINT64)UINT32_MAX - (priority)))
/*
* Prototypes.
*/
static void windivert_driver_unload(void);
extern VOID windivert_ioctl(IN WDFQUEUE queue, IN WDFREQUEST request,
IN size_t in_length, IN size_t out_len, IN ULONG code);
static NTSTATUS windivert_read(context_t context, WDFREQUEST request);
extern VOID windivert_worker(IN WDFWORKITEM item);
static void windivert_read_service(context_t context);
extern VOID windivert_create(IN WDFDEVICE device, IN WDFREQUEST request,
IN WDFFILEOBJECT object);
static NTSTATUS windivert_install_sublayer(layer_t layer);
static NTSTATUS windivert_install_callouts(context_t context, UINT8 layer,
UINT64 flags);
static NTSTATUS windivert_install_callout(context_t context, UINT idx,
layer_t layer, UINT32 *callout_id_ptr);
static void windivert_uninstall_callouts(context_t context,
context_state_t state);
extern VOID windivert_cleanup(IN WDFFILEOBJECT object);
extern VOID windivert_close(IN WDFFILEOBJECT object);
extern VOID windivert_destroy(IN WDFOBJECT object);
extern NTSTATUS windivert_write(context_t context, WDFREQUEST request,
req_context_t req_context);
extern void NTAPI windivert_inject_complete(VOID *context,
NET_BUFFER_LIST *packets, BOOLEAN dispatch_level);
extern void NTAPI windivert_reinject_complete(VOID *context,
NET_BUFFER_LIST *packets, BOOLEAN dispatch_level);
static NTSTATUS windivert_notify(IN FWPS_CALLOUT_NOTIFY_TYPE type,
IN const GUID *filter_key, IN const FWPS_FILTER0 *filter);
static void windivert_outbound_network_v4_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result);
static void windivert_inbound_network_v4_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result);
static void windivert_outbound_network_v6_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result);
static void windivert_inbound_network_v6_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result);
static void windivert_forward_network_v4_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result);
static void windivert_forward_network_v6_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result);
static void windivert_flow_established_v4_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result);
static void windivert_flow_established_v6_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result);
static void windivert_resource_assignment_v4_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result);
static void windivert_resource_assignment_v6_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result);
static void windivert_auth_connect_v4_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result);
static void windivert_auth_connect_v6_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result);
static void windivert_auth_listen_v4_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result);
static void windivert_auth_listen_v6_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result);
static void windivert_auth_recv_accept_v4_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result);
static void windivert_auth_recv_accept_v6_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result);
static void windivert_flow_established_classify(context_t context,
IN UINT64 flow_id, IN PWINDIVERT_DATA_FLOW flow_data, IN BOOL ipv4,
IN BOOL outbound, IN BOOL loopback, OUT FWPS_CLASSIFY_OUT0 *result);
static void windivert_flow_delete_notify(UINT16 layer_id, UINT32 callout_id,
UINT64 flow_context);
static void windivert_socket_classify(context_t context,
PWINDIVERT_DATA_SOCKET socket_data, WINDIVERT_EVENT event, BOOL ipv4,
BOOL outbound, BOOL loopback, FWPS_CLASSIFY_OUT0 *result);
static void windivert_network_classify(context_t context,
IN PWINDIVERT_DATA_NETWORK network_data, IN BOOL ipv4, IN BOOL outbound,
IN BOOL loopback, IN UINT advance, IN OUT void *data,
OUT FWPS_CLASSIFY_OUT0 *result);
static BOOL windivert_queue_work(context_t context, PVOID packet,
ULONG packet_len, PNET_BUFFER_LIST buffers, WINDIVERT_LAYER layer,
PVOID layer_data, WINDIVERT_EVENT event, UINT64 flags, UINT32 priority,
BOOL ipv4, BOOL outbound, BOOL loopback, BOOL impostor, BOOL match,
LONGLONG timestamp);
static void windivert_queue_packet(context_t context, packet_t packet);
static void windivert_reinject_packet(packet_t packet);
static void windivert_free_packet(packet_t packet);
static BOOL windivert_decrement_ttl(PVOID data, BOOL ipv4);
static int windivert_big_num_compare(const UINT32 *a, const UINT32 *b,
BOOL big);
static BOOL windivert_parse_headers(PNET_BUFFER buffer, BOOL ipv4,
PWINDIVERT_IPHDR *ip_header_ptr, PWINDIVERT_IPV6HDR *ipv6_header_ptr,
PWINDIVERT_ICMPHDR *icmp_header_ptr,
PWINDIVERT_ICMPV6HDR *icmpv6_header_ptr,
PWINDIVERT_TCPHDR *tcp_header_ptr, PWINDIVERT_UDPHDR *udp_header_ptr,
UINT8 *proto_ptr, UINT *header_len_ptr, UINT *payload_len_ptr);
static BOOL windivert_filter(PNET_BUFFER buffer, WINDIVERT_LAYER layer,
const VOID *layer_data, LONGLONG timestamp, WINDIVERT_EVENT event,
BOOL ipv4, BOOL outbound, BOOL loopback, BOOL impostor,
const WINDIVERT_FILTER *filter);
static const WINDIVERT_FILTER *windivert_filter_compile(
const WINDIVERT_FILTER *ioctl_filter, size_t ioctl_filter_len,
WINDIVERT_LAYER layer);
static NTSTATUS windivert_reflect_init(WDFOBJECT parent);
static void windivert_reflect_close(void);
static void windivert_reflect_open_event(context_t context);
static void windivert_reflect_close_event(context_t context);
static void windivert_reflect_event_notify(context_t context,
LONGLONG timestamp, WINDIVERT_EVENT event);
static void windivert_reflect_established_notify(context_t context,
LONGLONG timestamp);
static void windivert_reflect_worker(IN WDFWORKITEM item);
/*
* WinDivert sublayer GUIDs
*/
DEFINE_GUID(WINDIVERT_SUBLAYER_INBOUND_IPV4_GUID,
0x82A99281, 0x0389, 0x4DE2,
0xAE, 0x2D, 0xA4, 0x51, 0x59, 0x16, 0x26, 0x06);
DEFINE_GUID(WINDIVERT_SUBLAYER_OUTBOUND_IPV4_GUID,
0xB0BB07C6, 0x3B3B, 0x41FE,
0x83, 0x8B, 0xD8, 0x37, 0xDD, 0xB8, 0x75, 0x41);
DEFINE_GUID(WINDIVERT_SUBLAYER_INBOUND_IPV6_GUID,
0xD7674846, 0x3AB5, 0x4E93,
0x82, 0xD0, 0x2F, 0xCC, 0x03, 0xA2, 0x88, 0x7A);
DEFINE_GUID(WINDIVERT_SUBLAYER_OUTBOUND_IPV6_GUID,
0x6672F761, 0xA0F2, 0x4578,
0x92, 0x50, 0x09, 0x03, 0x0D, 0x4E, 0x8C, 0x46);
DEFINE_GUID(WINDIVERT_SUBLAYER_FORWARD_IPV4_GUID,
0x4622DCC6, 0xBD71, 0x48ED,
0x9D, 0x1A, 0x72, 0xC9, 0x0D, 0xEB, 0xA1, 0x74);
DEFINE_GUID(WINDIVERT_SUBLAYER_FORWARD_IPV6_GUID,
0x7E5B39EC, 0xB54C, 0x41B3,
0xA7, 0x99, 0x47, 0x5E, 0x57, 0x41, 0xA4, 0x33);
DEFINE_GUID(WINDIVERT_SUBLAYER_FLOW_ESTABLISHED_IPV4_GUID,
0x53D6C270, 0xEB79, 0x44CD,
0x83, 0xCD, 0x14, 0x34, 0xE6, 0x13, 0x91, 0x68);
DEFINE_GUID(WINDIVERT_SUBLAYER_FLOW_ESTABLISHED_IPV6_GUID,
0x44B0CDED, 0xAA11, 0x4704,
0x92, 0xA7, 0x99, 0xD2, 0xB7, 0x59, 0x7A, 0x68);
DEFINE_GUID(WINDIVERT_SUBLAYER_RESOURCE_ASSIGNMENT_IPV4_GUID,
0x736848B6, 0xBE0D, 0x4A8D,
0xA0, 0xC2, 0xE2, 0x02, 0xDC, 0x29, 0x32, 0xBC);
DEFINE_GUID(WINDIVERT_SUBLAYER_RESOURCE_ASSIGNMENT_IPV6_GUID,
0xF3458E58, 0xD123, 0x439B,
0xB6, 0x40, 0x74, 0x3C, 0xC7, 0x53, 0x9E, 0x36);
DEFINE_GUID(WINDIVERT_SUBLAYER_AUTH_CONNECT_IPV4_GUID,
0x2F97411F, 0x6350, 0x450A,
0xBF, 0x45, 0x4C, 0x0B, 0xC1, 0xDB, 0x3F, 0x7E);
DEFINE_GUID(WINDIVERT_SUBLAYER_AUTH_CONNECT_IPV6_GUID,
0x7BAFEEEB, 0x84F0, 0x4BB0,
0x91, 0x1F, 0x7E, 0x62, 0x2D, 0x73, 0x24, 0x2C);
DEFINE_GUID(WINDIVERT_SUBLAYER_AUTH_LISTEN_IPV4_GUID,
0x49F2A9AD, 0x805E, 0x4328,
0xBB, 0xDA, 0x92, 0x57, 0xB5, 0x18, 0x3A, 0x40);
DEFINE_GUID(WINDIVERT_SUBLAYER_AUTH_LISTEN_IPV6_GUID,
0xC1BB250E, 0xDE07, 0x41AB,
0x82, 0xEE, 0xAD, 0x7B, 0xFF, 0x13, 0xCE, 0x35);
DEFINE_GUID(WINDIVERT_SUBLAYER_AUTH_RECV_ACCEPT_IPV4_GUID,
0x7A012579, 0xC75A, 0x4D29,
0xB7, 0x47, 0x04, 0xAD, 0x3C, 0x7B, 0x32, 0x69);
DEFINE_GUID(WINDIVERT_SUBLAYER_AUTH_RECV_ACCEPT_IPV6_GUID,
0x1C51DD53, 0x6BA4, 0x4149,
0x89, 0x97, 0x1C, 0xD4, 0x8B, 0x51, 0x1B, 0x7D);
/*
* WinDivert supported layers.
*/
static const struct layer_s windivert_layer_inbound_network_ipv4 =
{
L"" WINDIVERT_DEVICE_NAME L"_SubLayerInboundNetworkIPv4",
L"" WINDIVERT_DEVICE_NAME L" sublayer network (inbound IPv4)",
L"" WINDIVERT_DEVICE_NAME L"_CalloutInboundNetworkIPv4",
L"" WINDIVERT_DEVICE_NAME L" callout network (inbound IPv4)",
L"" WINDIVERT_DEVICE_NAME L"_FilterInboundNetworkIPv4",
L"" WINDIVERT_DEVICE_NAME L" filter network (inbound IPv4)",
&FWPM_LAYER_INBOUND_IPPACKET_V4,
&WINDIVERT_SUBLAYER_INBOUND_IPV4_GUID,
windivert_inbound_network_v4_classify,
NULL,
UINT16_MAX
};
#define WINDIVERT_LAYER_INBOUND_NETWORK_IPV4 \
(&windivert_layer_inbound_network_ipv4)
static const struct layer_s windivert_layer_outbound_network_ipv4 =
{
L"" WINDIVERT_DEVICE_NAME L"_SubLayerOutboundNetworkIPv4",
L"" WINDIVERT_DEVICE_NAME L" sublayer network (outbound IPv4)",
L"" WINDIVERT_DEVICE_NAME L"_CalloutOutboundNetworkIPv4",
L"" WINDIVERT_DEVICE_NAME L" callout network (outbound IPv4)",
L"" WINDIVERT_DEVICE_NAME L"_FilterOutboundNetworkIPv4",
L"" WINDIVERT_DEVICE_NAME L" filter network (outbound IPv4)",
&FWPM_LAYER_OUTBOUND_IPPACKET_V4,
&WINDIVERT_SUBLAYER_OUTBOUND_IPV4_GUID,
windivert_outbound_network_v4_classify,
NULL,
UINT16_MAX
};
#define WINDIVERT_LAYER_OUTBOUND_NETWORK_IPV4 \
(&windivert_layer_outbound_network_ipv4)
static const struct layer_s windivert_layer_inbound_network_ipv6 =
{
L"" WINDIVERT_DEVICE_NAME L"_SubLayerInboundNetworkIPv6",
L"" WINDIVERT_DEVICE_NAME L" sublayer network (inbound IPv6)",
L"" WINDIVERT_DEVICE_NAME L"_CalloutInboundNetworkIPv6",
L"" WINDIVERT_DEVICE_NAME L" callout network (inbound IPv6)",
L"" WINDIVERT_DEVICE_NAME L"_FilterInboundNetworkIPv6",
L"" WINDIVERT_DEVICE_NAME L" filter network (inbound IPv6)",
&FWPM_LAYER_INBOUND_IPPACKET_V6,
&WINDIVERT_SUBLAYER_INBOUND_IPV6_GUID,
windivert_inbound_network_v6_classify,
NULL,
UINT16_MAX
};
#define WINDIVERT_LAYER_INBOUND_NETWORK_IPV6 \
(&windivert_layer_inbound_network_ipv6)
static const struct layer_s windivert_layer_outbound_network_ipv6 =
{
L"" WINDIVERT_DEVICE_NAME L"_SubLayerOutboundNetworkIPv6",
L"" WINDIVERT_DEVICE_NAME L" sublayer network (outbound IPv6)",
L"" WINDIVERT_DEVICE_NAME L"_CalloutOutboundNetworkIPv6",
L"" WINDIVERT_DEVICE_NAME L" callout network (outbound IPv6)",
L"" WINDIVERT_DEVICE_NAME L"_FilterOutboundNetworkIPv6",
L"" WINDIVERT_DEVICE_NAME L" filter network (outbound IPv6)",
&FWPM_LAYER_OUTBOUND_IPPACKET_V6,
&WINDIVERT_SUBLAYER_OUTBOUND_IPV6_GUID,
windivert_outbound_network_v6_classify,
NULL,
UINT16_MAX
};
#define WINDIVERT_LAYER_OUTBOUND_NETWORK_IPV6 \
(&windivert_layer_outbound_network_ipv6)
static const struct layer_s windivert_layer_forward_network_ipv4 =
{
L"" WINDIVERT_DEVICE_NAME L"_SubLayerForwardNetworkIPv4",
L"" WINDIVERT_DEVICE_NAME L" sublayer network (forward IPv4)",
L"" WINDIVERT_DEVICE_NAME L"_CalloutForwardNetworkIPv4",
L"" WINDIVERT_DEVICE_NAME L" callout network (forward IPv4)",
L"" WINDIVERT_DEVICE_NAME L"_FilterForwardNetworkIPv4",
L"" WINDIVERT_DEVICE_NAME L" filter network (forward IPv4)",
&FWPM_LAYER_IPFORWARD_V4,
&WINDIVERT_SUBLAYER_FORWARD_IPV4_GUID,
windivert_forward_network_v4_classify,
NULL,
UINT16_MAX
};
#define WINDIVERT_LAYER_FORWARD_NETWORK_IPV4 \
(&windivert_layer_forward_network_ipv4)
static const struct layer_s windivert_layer_forward_network_ipv6 =
{
L"" WINDIVERT_DEVICE_NAME L"_SubLayerForwardNetworkIPv6",
L"" WINDIVERT_DEVICE_NAME L" sublayer network (forward IPv6)",
L"" WINDIVERT_DEVICE_NAME L"_CalloutForwardNetworkIPv6",
L"" WINDIVERT_DEVICE_NAME L" callout network (forward IPv6)",
L"" WINDIVERT_DEVICE_NAME L"_FilterForwardNetworkIPv6",
L"" WINDIVERT_DEVICE_NAME L" filter network (forward IPv6)",
&FWPM_LAYER_IPFORWARD_V6,
&WINDIVERT_SUBLAYER_FORWARD_IPV6_GUID,
windivert_forward_network_v6_classify,
NULL,
UINT16_MAX
};
#define WINDIVERT_LAYER_FORWARD_NETWORK_IPV6 \
(&windivert_layer_forward_network_ipv6)
static const struct layer_s windivert_layer_resource_assignment_ipv4 =
{
L"" WINDIVERT_DEVICE_NAME L"_SubLayerResourceAssignmentIPv4",
L"" WINDIVERT_DEVICE_NAME L" sublayer resource assignment (IPv4)",
L"" WINDIVERT_DEVICE_NAME L"_CalloutResourceAssignmentIPv4",
L"" WINDIVERT_DEVICE_NAME L" callout resource assignment (IPv4)",
L"" WINDIVERT_DEVICE_NAME L"_FilterResourceAssignmentIPv4",
L"" WINDIVERT_DEVICE_NAME L" filter resource assignment (IPv4)",
&FWPM_LAYER_ALE_RESOURCE_ASSIGNMENT_V4,
&WINDIVERT_SUBLAYER_RESOURCE_ASSIGNMENT_IPV4_GUID,
windivert_resource_assignment_v4_classify,
NULL,
0
};
#define WINDIVERT_LAYER_RESOURCE_ASSIGNMENT_IPV4 \
(&windivert_layer_resource_assignment_ipv4)
static const struct layer_s windivert_layer_resource_assignment_ipv6 =
{
L"" WINDIVERT_DEVICE_NAME L"_SubLayerResourceAssignmentIPv6",
L"" WINDIVERT_DEVICE_NAME L" sublayer resource assignment (IPv6)",
L"" WINDIVERT_DEVICE_NAME L"_CalloutResourceAssignmentIPv6",
L"" WINDIVERT_DEVICE_NAME L" callout resource assignment (IPv6)",
L"" WINDIVERT_DEVICE_NAME L"_FilterResourceAssignmentIPv6",
L"" WINDIVERT_DEVICE_NAME L" filter resource assignment (IPv6)",
&FWPM_LAYER_ALE_RESOURCE_ASSIGNMENT_V6,
&WINDIVERT_SUBLAYER_RESOURCE_ASSIGNMENT_IPV6_GUID,
windivert_resource_assignment_v6_classify,
NULL,
0
};
#define WINDIVERT_LAYER_RESOURCE_ASSIGNMENT_IPV6 \
(&windivert_layer_resource_assignment_ipv6)
static const struct layer_s windivert_layer_auth_connect_ipv4 =
{
L"" WINDIVERT_DEVICE_NAME L"_SubLayerAuthConnectIPv4",
L"" WINDIVERT_DEVICE_NAME L" sublayer auth connect (IPv4)",
L"" WINDIVERT_DEVICE_NAME L"_CalloutAuthConnectIPv4",
L"" WINDIVERT_DEVICE_NAME L" callout auth connect (IPv4)",
L"" WINDIVERT_DEVICE_NAME L"_FilterAuthConnectIPv4",
L"" WINDIVERT_DEVICE_NAME L" filter auth connect (IPv4)",
&FWPM_LAYER_ALE_AUTH_CONNECT_V4,
&WINDIVERT_SUBLAYER_AUTH_CONNECT_IPV4_GUID,
windivert_auth_connect_v4_classify,
NULL,
0
};
#define WINDIVERT_LAYER_AUTH_CONNECT_IPV4 \
(&windivert_layer_auth_connect_ipv4)
static const struct layer_s windivert_layer_auth_connect_ipv6 =
{
L"" WINDIVERT_DEVICE_NAME L"_SubLayerAuthConnectIPv6",
L"" WINDIVERT_DEVICE_NAME L" sublayer auth connect (IPv6)",
L"" WINDIVERT_DEVICE_NAME L"_CalloutAuthConnectIPv6",
L"" WINDIVERT_DEVICE_NAME L" callout auth connect (IPv6)",
L"" WINDIVERT_DEVICE_NAME L"_FilterAuthConnectIPv6",
L"" WINDIVERT_DEVICE_NAME L" filter auth connect (IPv6)",
&FWPM_LAYER_ALE_AUTH_CONNECT_V6,
&WINDIVERT_SUBLAYER_AUTH_CONNECT_IPV6_GUID,
windivert_auth_connect_v6_classify,
NULL,
0
};
#define WINDIVERT_LAYER_AUTH_CONNECT_IPV6 \
(&windivert_layer_auth_connect_ipv6)
static const struct layer_s windivert_layer_auth_listen_ipv4 =
{
L"" WINDIVERT_DEVICE_NAME L"_SubLayerAuthListenIPv4",
L"" WINDIVERT_DEVICE_NAME L" sublayer auth listen (IPv4)",
L"" WINDIVERT_DEVICE_NAME L"_CalloutAuthListenIPv4",
L"" WINDIVERT_DEVICE_NAME L" callout auth listen (IPv4)",
L"" WINDIVERT_DEVICE_NAME L"_FilterAuthListenIPv4",
L"" WINDIVERT_DEVICE_NAME L" filter auth listen (IPv4)",
&FWPM_LAYER_ALE_AUTH_LISTEN_V4,
&WINDIVERT_SUBLAYER_AUTH_LISTEN_IPV4_GUID,
windivert_auth_listen_v4_classify,
NULL,
0
};
#define WINDIVERT_LAYER_AUTH_LISTEN_IPV4 \
(&windivert_layer_auth_listen_ipv4)
static const struct layer_s windivert_layer_auth_listen_ipv6 =
{
L"" WINDIVERT_DEVICE_NAME L"_SubLayerAuthListenIPv6",
L"" WINDIVERT_DEVICE_NAME L" sublayer auth listen (IPv6)",
L"" WINDIVERT_DEVICE_NAME L"_CalloutAuthListenIPv6",
L"" WINDIVERT_DEVICE_NAME L" callout auth listen (IPv6)",
L"" WINDIVERT_DEVICE_NAME L"_FilterAuthListenIPv6",
L"" WINDIVERT_DEVICE_NAME L" filter auth listen (IPv6)",
&FWPM_LAYER_ALE_AUTH_LISTEN_V6,
&WINDIVERT_SUBLAYER_AUTH_LISTEN_IPV6_GUID,
windivert_auth_listen_v6_classify,
NULL,
0
};
#define WINDIVERT_LAYER_AUTH_LISTEN_IPV6 \
(&windivert_layer_auth_listen_ipv6)
static const struct layer_s windivert_layer_auth_recv_accept_ipv4 =
{
L"" WINDIVERT_DEVICE_NAME L"_SubLayerAuthRecvAcceptIPv4",
L"" WINDIVERT_DEVICE_NAME L" sublayer auth recv accept (IPv4)",
L"" WINDIVERT_DEVICE_NAME L"_CalloutAuthRecvAcceptIPv4",
L"" WINDIVERT_DEVICE_NAME L" callout auth recv accept (IPv4)",
L"" WINDIVERT_DEVICE_NAME L"_FilterAuthRecvAcceptIPv4",
L"" WINDIVERT_DEVICE_NAME L" filter auth recv accept (IPv4)",
&FWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V4,
&WINDIVERT_SUBLAYER_AUTH_RECV_ACCEPT_IPV4_GUID,
windivert_auth_recv_accept_v4_classify,
NULL,
0
};
#define WINDIVERT_LAYER_AUTH_RECV_ACCEPT_IPV4 \
(&windivert_layer_auth_recv_accept_ipv4)
static const struct layer_s windivert_layer_auth_recv_accept_ipv6 =
{
L"" WINDIVERT_DEVICE_NAME L"_SubLayerAuthRecvAcceptIPv6",
L"" WINDIVERT_DEVICE_NAME L" sublayer auth recv accept (IPv6)",
L"" WINDIVERT_DEVICE_NAME L"_CalloutAuthRecvAcceptIPv6",
L"" WINDIVERT_DEVICE_NAME L" callout auth recv accept (IPv6)",
L"" WINDIVERT_DEVICE_NAME L"_FilterAuthRecvAcceptIPv6",
L"" WINDIVERT_DEVICE_NAME L" filter auth recv accept (IPv6)",
&FWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V6,
&WINDIVERT_SUBLAYER_AUTH_RECV_ACCEPT_IPV6_GUID,
windivert_auth_recv_accept_v6_classify,
NULL,
0
};
#define WINDIVERT_LAYER_AUTH_RECV_ACCEPT_IPV6 \
(&windivert_layer_auth_recv_accept_ipv6)
static const struct layer_s windivert_layer_flow_established_ipv4 =
{
L"" WINDIVERT_DEVICE_NAME L"_SubLayerFlowEstablishedIPv4",
L"" WINDIVERT_DEVICE_NAME L" sublayer flow established (IPv4)",
L"" WINDIVERT_DEVICE_NAME L"_CalloutFlowEstablishedIPv4",
L"" WINDIVERT_DEVICE_NAME L" callout flow established (IPv4)",
L"" WINDIVERT_DEVICE_NAME L"_FilterFlowEstablishedIPv4",
L"" WINDIVERT_DEVICE_NAME L" filter flow established (IPv4)",
&FWPM_LAYER_ALE_FLOW_ESTABLISHED_V4,
&WINDIVERT_SUBLAYER_FLOW_ESTABLISHED_IPV4_GUID,
windivert_flow_established_v4_classify,
windivert_flow_delete_notify,
0
};
#define WINDIVERT_LAYER_FLOW_ESTABLISHED_IPV4 \
(&windivert_layer_flow_established_ipv4)
static const struct layer_s windivert_layer_flow_established_ipv6 =
{
L"" WINDIVERT_DEVICE_NAME L"_SubLayerFlowEstablishedIPv6",
L"" WINDIVERT_DEVICE_NAME L" sublayer flow established (IPv6)",
L"" WINDIVERT_DEVICE_NAME L"_CalloutFlowEstablishedIPv6",
L"" WINDIVERT_DEVICE_NAME L" callout flow established (IPv6)",
L"" WINDIVERT_DEVICE_NAME L"_FilterFlowEstablishedIPv6",
L"" WINDIVERT_DEVICE_NAME L" filter flow established (IPv6)",
&FWPM_LAYER_ALE_FLOW_ESTABLISHED_V6,
&WINDIVERT_SUBLAYER_FLOW_ESTABLISHED_IPV6_GUID,
windivert_flow_established_v6_classify,
windivert_flow_delete_notify,
0
};
#define WINDIVERT_LAYER_FLOW_ESTABLISHED_IPV6 \
(&windivert_layer_flow_established_ipv6)
/*
* Shared functions.
*/
#include "windivert_shared.c"
/*
* WinDivert malloc/free.
*/
static PVOID windivert_malloc(SIZE_T size, BOOL paged)
{
POOL_TYPE pool = (paged? PagedPool: non_paged_pool);
if (size == 0)
{
return NULL;
}
return ExAllocatePoolWithTag(pool, size, WINDIVERT_TAG);
}
static VOID windivert_free(PVOID ptr)
{
if (ptr != NULL)
{
ExFreePoolWithTag(ptr, WINDIVERT_TAG);
}
}
/*
* WinDivert driver entry routine.
*/
extern NTSTATUS DriverEntry(IN PDRIVER_OBJECT driver_obj,
IN PUNICODE_STRING reg_path)
{
WDF_DRIVER_CONFIG config;
WDFDRIVER driver;
PWDFDEVICE_INIT device_init;
WDFDEVICE device;
WDF_FILEOBJECT_CONFIG file_config;
WDF_IO_QUEUE_CONFIG queue_config;
WDFQUEUE queue;
WDF_OBJECT_ATTRIBUTES obj_attrs;
NET_BUFFER_LIST_POOL_PARAMETERS nbl_pool_params;
NET_BUFFER_POOL_PARAMETERS nb_pool_params;
RTL_OSVERSIONINFOW version;
LARGE_INTEGER freq;
NTSTATUS status;
DECLARE_CONST_UNICODE_STRING(device_name,
L"\\Device\\" WINDIVERT_DEVICE_NAME);
DECLARE_CONST_UNICODE_STRING(dos_device_name,
L"\\??\\" WINDIVERT_DEVICE_NAME);
DEBUG("LOAD: loading WinDivert driver");
// Use the "no execute" pool if available:
status = RtlGetVersion(&version);
if (NT_SUCCESS(status))
{
if (version.dwMajorVersion > 6 ||
(version.dwMajorVersion == 6 && version.dwMinorVersion >= 2))
{
non_paged_pool = (POOL_TYPE)512; // NonPagedPoolNx (documented)
no_exec_flag = (MM_PAGE_PRIORITY)0x40000000;
// MdlMappingNoExecute
no_write_flag = (MM_PAGE_PRIORITY)0x80000000;
// MdlMappingNoWrite
}
}
// Initialize timer info.
KeQueryPerformanceCounter(&freq);
counts_per_ms = freq.QuadPart / 1000;
counts_per_ms = (counts_per_ms == 0? 1: counts_per_ms);
// Configure ourself as a non-PnP driver:
WDF_DRIVER_CONFIG_INIT(&config, WDF_NO_EVENT_CALLBACK);
config.DriverInitFlags |= WdfDriverInitNonPnpDriver;
config.EvtDriverUnload = windivert_unload;
status = WdfDriverCreate(driver_obj, reg_path, WDF_NO_OBJECT_ATTRIBUTES,
&config, &driver);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to create WDF driver", status);
goto driver_entry_exit;
}
device_init = WdfControlDeviceInitAllocate(driver,
&SDDL_DEVOBJ_SYS_ALL_ADM_ALL);
if (device_init == NULL)
{
status = STATUS_INSUFFICIENT_RESOURCES;
DEBUG_ERROR("failed to allocate WDF control device init structure",
status);
goto driver_entry_exit;
}
WdfDeviceInitSetDeviceType(device_init, FILE_DEVICE_NETWORK);
WdfDeviceInitSetIoType(device_init, WdfDeviceIoDirect);
status = WdfDeviceInitAssignName(device_init, &device_name);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to create WDF device name", status);
WdfDeviceInitFree(device_init);
goto driver_entry_exit;
}
WDF_FILEOBJECT_CONFIG_INIT(&file_config, windivert_create, windivert_close,
windivert_cleanup);
WDF_OBJECT_ATTRIBUTES_INIT_CONTEXT_TYPE(&obj_attrs, context_s);
obj_attrs.ExecutionLevel = WdfExecutionLevelPassive;
obj_attrs.SynchronizationScope = WdfSynchronizationScopeNone;
obj_attrs.EvtDestroyCallback = windivert_destroy;
WdfDeviceInitSetFileObjectConfig(device_init, &file_config, &obj_attrs);
WdfDeviceInitSetIoInCallerContextCallback(device_init,
windivert_caller_context);
WDF_OBJECT_ATTRIBUTES_INIT(&obj_attrs);
status = WdfDeviceCreate(&device_init, &obj_attrs, &device);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to create WDF control device", status);
WdfDeviceInitFree(device_init);
goto driver_entry_exit;
}
WDF_IO_QUEUE_CONFIG_INIT_DEFAULT_QUEUE(&queue_config,
WdfIoQueueDispatchParallel);
queue_config.EvtIoRead = NULL;
queue_config.EvtIoWrite = NULL;
queue_config.EvtIoDeviceControl = windivert_ioctl;
WDF_OBJECT_ATTRIBUTES_INIT(&obj_attrs);
obj_attrs.ExecutionLevel = WdfExecutionLevelPassive;
obj_attrs.SynchronizationScope = WdfSynchronizationScopeNone;
status = WdfIoQueueCreate(device, &queue_config, &obj_attrs, &queue);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to create default WDF queue", status);
goto driver_entry_exit;
}
status = WdfDeviceCreateSymbolicLink(device, &dos_device_name);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to create device symbolic link", status);
goto driver_entry_exit;
}
WdfControlFinishInitializing(device);
// Create the packet injection handles.
status = FwpsInjectionHandleCreate0(AF_INET,
FWPS_INJECTION_TYPE_NETWORK | FWPS_INJECTION_TYPE_FORWARD,
&inject_handle);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to create WFP packet injection handle", status);
goto driver_entry_exit;
}
status = FwpsInjectionHandleCreate0(AF_INET6,
FWPS_INJECTION_TYPE_NETWORK | FWPS_INJECTION_TYPE_FORWARD,
&injectv6_handle);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to create WFP ipv6 packet injection handle",
status);
goto driver_entry_exit;
}
// Create a NET_BUFFER_LIST pool handle.
RtlZeroMemory(&nbl_pool_params, sizeof(nbl_pool_params));
nbl_pool_params.Header.Type = NDIS_OBJECT_TYPE_DEFAULT;
nbl_pool_params.Header.Revision =
NET_BUFFER_LIST_POOL_PARAMETERS_REVISION_1;
nbl_pool_params.Header.Size = sizeof(nbl_pool_params);
nbl_pool_params.fAllocateNetBuffer = TRUE;
nbl_pool_params.PoolTag = WINDIVERT_TAG;
nbl_pool_params.DataSize = 0;
nbl_pool_handle = NdisAllocateNetBufferListPool(NULL, &nbl_pool_params);
if (nbl_pool_handle == NULL)
{
status = STATUS_INSUFFICIENT_RESOURCES;
DEBUG_ERROR("failed to allocate net buffer list pool", status);
goto driver_entry_exit;
}
// Create a NET_BUFFER pool handle.
RtlZeroMemory(&nb_pool_params, sizeof(nb_pool_params));
nb_pool_params.Header.Type = NDIS_OBJECT_TYPE_DEFAULT;
nb_pool_params.Header.Revision = NET_BUFFER_POOL_PARAMETERS_REVISION_1;
nb_pool_params.Header.Size =
NDIS_SIZEOF_NET_BUFFER_POOL_PARAMETERS_REVISION_1;
nb_pool_params.PoolTag = WINDIVERT_TAG;
nb_pool_params.DataSize = 0;
nb_pool_handle = NdisAllocateNetBufferPool(NULL, &nb_pool_params);
if (nb_pool_handle == NULL)
{
status = STATUS_INSUFFICIENT_RESOURCES;
DEBUG_ERROR("failed to allocate net buffer pool", status);
goto driver_entry_exit;
}
// Open a handle to the filter engine:
status = FwpmEngineOpen0(NULL, RPC_C_AUTHN_DEFAULT, NULL, NULL,
&engine_handle);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to create WFP engine handle", status);
goto driver_entry_exit;
}
// Register WFP sub-layers:
status = FwpmTransactionBegin0(engine_handle, 0);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to begin WFP transaction", status);
goto driver_entry_exit;
}
status = windivert_install_sublayer(WINDIVERT_LAYER_INBOUND_NETWORK_IPV4);
if (!NT_SUCCESS(status))
{
driver_entry_sublayer_error:
DEBUG_ERROR("failed to install WFP sub-layer", status);
FwpmTransactionAbort0(engine_handle);
goto driver_entry_exit;
}
status = windivert_install_sublayer(WINDIVERT_LAYER_OUTBOUND_NETWORK_IPV4);
if (!NT_SUCCESS(status))
{
goto driver_entry_sublayer_error;
}
status = windivert_install_sublayer(WINDIVERT_LAYER_INBOUND_NETWORK_IPV6);
if (!NT_SUCCESS(status))
{
goto driver_entry_sublayer_error;
}
status = windivert_install_sublayer(WINDIVERT_LAYER_OUTBOUND_NETWORK_IPV6);
if (!NT_SUCCESS(status))
{
goto driver_entry_sublayer_error;
}
status = windivert_install_sublayer(WINDIVERT_LAYER_FORWARD_NETWORK_IPV4);
if (!NT_SUCCESS(status))
{
goto driver_entry_sublayer_error;
}
status = windivert_install_sublayer(WINDIVERT_LAYER_FORWARD_NETWORK_IPV6);
if (!NT_SUCCESS(status))
{
goto driver_entry_sublayer_error;
}
status = windivert_install_sublayer(WINDIVERT_LAYER_FLOW_ESTABLISHED_IPV4);
if (!NT_SUCCESS(status))
{
goto driver_entry_sublayer_error;
}
status = windivert_install_sublayer(WINDIVERT_LAYER_FLOW_ESTABLISHED_IPV6);
if (!NT_SUCCESS(status))
{
goto driver_entry_sublayer_error;
}
status = windivert_install_sublayer(
WINDIVERT_LAYER_RESOURCE_ASSIGNMENT_IPV4);
if (!NT_SUCCESS(status))
{
goto driver_entry_sublayer_error;
}
status = windivert_install_sublayer(
WINDIVERT_LAYER_RESOURCE_ASSIGNMENT_IPV6);
if (!NT_SUCCESS(status))
{
goto driver_entry_sublayer_error;
}
status = windivert_install_sublayer(WINDIVERT_LAYER_AUTH_CONNECT_IPV4);
if (!NT_SUCCESS(status))
{
goto driver_entry_sublayer_error;
}
status = windivert_install_sublayer(WINDIVERT_LAYER_AUTH_CONNECT_IPV6);
if (!NT_SUCCESS(status))
{
goto driver_entry_sublayer_error;
}
status = windivert_install_sublayer(WINDIVERT_LAYER_AUTH_LISTEN_IPV4);
if (!NT_SUCCESS(status))
{
goto driver_entry_sublayer_error;
}
status = windivert_install_sublayer(WINDIVERT_LAYER_AUTH_LISTEN_IPV6);
if (!NT_SUCCESS(status))
{
goto driver_entry_sublayer_error;
}
status = windivert_install_sublayer(WINDIVERT_LAYER_AUTH_RECV_ACCEPT_IPV4);
if (!NT_SUCCESS(status))
{
goto driver_entry_sublayer_error;
}
status = windivert_install_sublayer(WINDIVERT_LAYER_AUTH_RECV_ACCEPT_IPV6);
if (!NT_SUCCESS(status))
{
goto driver_entry_sublayer_error;
}
status = FwpmTransactionCommit0(engine_handle);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to commit WFP transaction", status);
goto driver_entry_exit;
}
status = windivert_reflect_init((WDFOBJECT)device);
if (!NT_SUCCESS(status))
{
goto driver_entry_exit;
}
driver_entry_exit:
if (!NT_SUCCESS(status))
{
windivert_driver_unload();
}
return status;
}
/*
* WinDivert driver unload routine.
*/
extern VOID windivert_unload(IN WDFDRIVER Driver)
{
windivert_driver_unload();
}
/*
* WinDivert driver unload.
*/
static void windivert_driver_unload(void)
{
NTSTATUS status;
DEBUG("UNLOAD: unloading the WinDivert driver");
if (inject_handle != NULL)
{
FwpsInjectionHandleDestroy0(inject_handle);
}
if (injectv6_handle != NULL)
{
FwpsInjectionHandleDestroy0(injectv6_handle);
}
if (nbl_pool_handle != NULL)
{
NdisFreeNetBufferListPool(nbl_pool_handle);
}
if (nb_pool_handle != NULL)
{
NdisFreeNetBufferPool(nb_pool_handle);
}
if (engine_handle != NULL)
{
status = FwpmTransactionBegin0(engine_handle, 0);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to begin WFP transaction", status);
FwpmEngineClose0(engine_handle);
return;
}
FwpmSubLayerDeleteByKey0(engine_handle,
WINDIVERT_LAYER_INBOUND_NETWORK_IPV4->sublayer_guid);
FwpmSubLayerDeleteByKey0(engine_handle,
WINDIVERT_LAYER_OUTBOUND_NETWORK_IPV4->sublayer_guid);
FwpmSubLayerDeleteByKey0(engine_handle,
WINDIVERT_LAYER_INBOUND_NETWORK_IPV6->sublayer_guid);
FwpmSubLayerDeleteByKey0(engine_handle,
WINDIVERT_LAYER_OUTBOUND_NETWORK_IPV6->sublayer_guid);
FwpmSubLayerDeleteByKey0(engine_handle,
WINDIVERT_LAYER_FORWARD_NETWORK_IPV4->sublayer_guid);
FwpmSubLayerDeleteByKey0(engine_handle,
WINDIVERT_LAYER_FORWARD_NETWORK_IPV6->sublayer_guid);
FwpmSubLayerDeleteByKey0(engine_handle,
WINDIVERT_LAYER_FLOW_ESTABLISHED_IPV4->sublayer_guid);
FwpmSubLayerDeleteByKey0(engine_handle,
WINDIVERT_LAYER_FLOW_ESTABLISHED_IPV6->sublayer_guid);
FwpmSubLayerDeleteByKey0(engine_handle,
WINDIVERT_LAYER_RESOURCE_ASSIGNMENT_IPV4->sublayer_guid);
FwpmSubLayerDeleteByKey0(engine_handle,
WINDIVERT_LAYER_RESOURCE_ASSIGNMENT_IPV6->sublayer_guid);
FwpmSubLayerDeleteByKey0(engine_handle,
WINDIVERT_LAYER_AUTH_CONNECT_IPV4->sublayer_guid);
FwpmSubLayerDeleteByKey0(engine_handle,
WINDIVERT_LAYER_AUTH_CONNECT_IPV6->sublayer_guid);
FwpmSubLayerDeleteByKey0(engine_handle,
WINDIVERT_LAYER_AUTH_LISTEN_IPV4->sublayer_guid);
FwpmSubLayerDeleteByKey0(engine_handle,
WINDIVERT_LAYER_AUTH_LISTEN_IPV6->sublayer_guid);
FwpmSubLayerDeleteByKey0(engine_handle,
WINDIVERT_LAYER_AUTH_RECV_ACCEPT_IPV4->sublayer_guid);
FwpmSubLayerDeleteByKey0(engine_handle,
WINDIVERT_LAYER_AUTH_RECV_ACCEPT_IPV6->sublayer_guid);
status = FwpmTransactionCommit0(engine_handle);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to commit WFP transaction", status);
}
FwpmEngineClose0(engine_handle);
}
}
/*
* Register a sub-layer.
*/
static NTSTATUS windivert_install_sublayer(layer_t layer)
{
FWPM_SUBLAYER0 sublayer;
NTSTATUS status;
RtlZeroMemory(&sublayer, sizeof(sublayer));
sublayer.subLayerKey = *(layer->sublayer_guid);
sublayer.displayData.name = layer->sublayer_name;
sublayer.displayData.description = layer->sublayer_desc;
sublayer.weight = layer->sublayer_weight;
status = FwpmSubLayerAdd0(engine_handle, &sublayer, NULL);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to add WFP sub-layer", status);
}
return status;
}
/*
* WinDivert create routine.
*/
extern VOID windivert_create(IN WDFDEVICE device, IN WDFREQUEST request,
IN WDFFILEOBJECT object)
{
WDF_IO_QUEUE_CONFIG queue_config;
WDF_WORKITEM_CONFIG item_config;
WDF_OBJECT_ATTRIBUTES obj_attrs;
FWPM_SESSION0 session;
NTSTATUS status = STATUS_SUCCESS;
UINT8 i;
context_t context = windivert_context_get(object);
DEBUG("CREATE: creating a new WinDivert context (context=%p)", context);
// Initialise the new context:
context->state = WINDIVERT_CONTEXT_STATE_OPENING;
context->device = device;
context->object = object;
context->work_queue_length = 0;
context->packet_queue_length = 0;
context->packet_queue_maxlength = WINDIVERT_PARAM_QUEUE_LEN_DEFAULT;
context->packet_queue_size = 0;
context->packet_queue_maxsize = WINDIVERT_PARAM_QUEUE_SIZE_DEFAULT;
context->packet_queue_maxcounts =
WINDIVERT_PARAM_QUEUE_TIME_DEFAULT * counts_per_ms;
context->packet_queue_maxtime = WINDIVERT_PARAM_QUEUE_TIME_DEFAULT;
context->layer = WINDIVERT_LAYER_DEFAULT;
context->flags = 0;
context->shutdown_recv = FALSE;
context->shutdown_recv_enabled = FALSE;
context->shutdown_send = FALSE;
context->priority = windivert_context_priority(WINDIVERT_PRIORITY_DEFAULT);
context->filter = NULL;
context->filter_len = 0;
context->filter_flags = 0;
context->worker = NULL;
for (i = 0; i < WINDIVERT_CONTEXT_MAXLAYERS; i++)
{
context->installed[i] = FALSE;
}
KeInitializeSpinLock(&context->lock);
InitializeListHead(&context->flow_set);
context->flow_v4_callout_id = 0;
context->flow_v6_callout_id = 0;
InitializeListHead(&context->work_queue);
InitializeListHead(&context->packet_queue);
for (i = 0; i < WINDIVERT_CONTEXT_MAXLAYERS; i++)
{
status = ExUuidCreate(&context->callout_guid[i]);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to create callout GUID", status);
goto windivert_create_exit;
}
status = ExUuidCreate(&context->filter_guid[i]);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to create filter GUID", status);
goto windivert_create_exit;
}
}
WDF_IO_QUEUE_CONFIG_INIT(&queue_config, WdfIoQueueDispatchManual);
status = WdfIoQueueCreate(device, &queue_config, WDF_NO_OBJECT_ATTRIBUTES,
&context->read_queue);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to create I/O read queue", status);
goto windivert_create_exit;
}
WDF_WORKITEM_CONFIG_INIT(&item_config, windivert_worker);
item_config.AutomaticSerialization = FALSE;
WDF_OBJECT_ATTRIBUTES_INIT(&obj_attrs);
obj_attrs.ParentObject = (WDFOBJECT)object;
status = WdfWorkItemCreate(&item_config, &obj_attrs, &context->worker);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to create read service work item", status);
goto windivert_create_exit;
}
RtlZeroMemory(&session, sizeof(session));
session.flags |= FWPM_SESSION_FLAG_DYNAMIC;
status = FwpmEngineOpen0(NULL, RPC_C_AUTHN_DEFAULT, NULL, &session,
&context->engine_handle);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to create WFP engine handle", status);
goto windivert_create_exit;
}
RtlZeroMemory(&context->reflect, sizeof(context->reflect));
windivert_create_exit:
// Clean-up on error:
if (!NT_SUCCESS(status))
{
context->state = WINDIVERT_CONTEXT_STATE_INVALID;
if (context->read_queue != NULL)
{
WdfObjectDelete(context->read_queue);
}
if (context->worker != NULL)
{
WdfObjectDelete(context->worker);
}
if (context->engine_handle != NULL)
{
FwpmEngineClose0(context->engine_handle);
}
}
WdfRequestComplete(request, status);
}
/*
* Register all WFP callouts.
*/
static NTSTATUS windivert_install_callouts(context_t context, UINT8 layer,
UINT64 flags)
{
UINT8 i, j;
layer_t layers[WINDIVERT_CONTEXT_MAXLAYERS];
UINT32 *callout_ids[WINDIVERT_CONTEXT_MAXLAYERS] = {NULL};
BOOL inbound, outbound, ipv4, ipv6, bind, connect, listen, accept;
NTSTATUS status = STATUS_SUCCESS;
inbound = ((flags & WINDIVERT_FILTER_FLAG_INBOUND) != 0);
outbound = ((flags & WINDIVERT_FILTER_FLAG_OUTBOUND) != 0);
ipv4 = ((flags & WINDIVERT_FILTER_FLAG_IP) != 0);
ipv6 = ((flags & WINDIVERT_FILTER_FLAG_IPV6) != 0);
bind = ((flags & WINDIVERT_FILTER_FLAG_EVENT_SOCKET_BIND) != 0);
connect = ((flags & WINDIVERT_FILTER_FLAG_EVENT_SOCKET_CONNECT) != 0);
listen = ((flags & WINDIVERT_FILTER_FLAG_EVENT_SOCKET_LISTEN) != 0);
accept = ((flags & WINDIVERT_FILTER_FLAG_EVENT_SOCKET_ACCEPT) != 0);
i = 0;
switch (layer)
{
case WINDIVERT_LAYER_NETWORK:
if (inbound && ipv4)
{
layers[i++] = WINDIVERT_LAYER_INBOUND_NETWORK_IPV4;
}
if (outbound && ipv4)
{
layers[i++] = WINDIVERT_LAYER_OUTBOUND_NETWORK_IPV4;
}
if (inbound && ipv6)
{
layers[i++] = WINDIVERT_LAYER_INBOUND_NETWORK_IPV6;
}
if (outbound && ipv6)
{
layers[i++] = WINDIVERT_LAYER_OUTBOUND_NETWORK_IPV6;
}
break;
case WINDIVERT_LAYER_NETWORK_FORWARD:
if (ipv4)
{
layers[i++] = WINDIVERT_LAYER_FORWARD_NETWORK_IPV4;
}
if (ipv6)
{
layers[i++] = WINDIVERT_LAYER_FORWARD_NETWORK_IPV6;
}
break;
case WINDIVERT_LAYER_FLOW:
if (ipv4)
{
callout_ids[i] = &context->flow_v4_callout_id;
layers[i++] = WINDIVERT_LAYER_FLOW_ESTABLISHED_IPV4;
}
if (ipv6)
{
callout_ids[i] = &context->flow_v6_callout_id;
layers[i++] = WINDIVERT_LAYER_FLOW_ESTABLISHED_IPV6;
}
break;
case WINDIVERT_LAYER_SOCKET:
if (ipv4 && bind)
{
layers[i++] = WINDIVERT_LAYER_RESOURCE_ASSIGNMENT_IPV4;
}
if (ipv4 && connect)
{
layers[i++] = WINDIVERT_LAYER_AUTH_CONNECT_IPV4;
}
if (ipv4 && listen)
{
layers[i++] = WINDIVERT_LAYER_AUTH_LISTEN_IPV4;
}
if (ipv4 && accept)
{
layers[i++] = WINDIVERT_LAYER_AUTH_RECV_ACCEPT_IPV4;
}
if (ipv6 && bind)
{
layers[i++] = WINDIVERT_LAYER_RESOURCE_ASSIGNMENT_IPV6;
}
if (ipv6 && connect)
{
layers[i++] = WINDIVERT_LAYER_AUTH_CONNECT_IPV6;
}
if (ipv6 && listen)
{
layers[i++] = WINDIVERT_LAYER_AUTH_LISTEN_IPV6;
}
if (ipv6 && accept)
{
layers[i++] = WINDIVERT_LAYER_AUTH_RECV_ACCEPT_IPV6;
}
break;
case WINDIVERT_LAYER_REFLECT:
break;
default:
return STATUS_INVALID_PARAMETER;
}
for (j = 0; j < i; j++)
{
status = windivert_install_callout(context, j, layers[j],
callout_ids[j]);
if (!NT_SUCCESS(status))
{
goto windivert_install_callouts_exit;
}
}
windivert_install_callouts_exit:
if (!NT_SUCCESS(status))
{
windivert_uninstall_callouts(context, WINDIVERT_CONTEXT_STATE_OPEN);
}
return status;
}
/*
* Register a WFP callout.
*/
static NTSTATUS windivert_install_callout(context_t context, UINT idx,
layer_t layer, UINT32 *callout_id_ptr)
{
KLOCK_QUEUE_HANDLE lock_handle;
FWPS_CALLOUT0 scallout;
FWPM_CALLOUT0 mcallout;
FWPM_FILTER0 filter;
UINT64 weight;
UINT32 priority;
GUID callout_guid, filter_guid;
UINT32 callout_id;
WDFDEVICE device;
HANDLE engine_handle;
NTSTATUS status;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_OPEN)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
status = STATUS_INVALID_DEVICE_STATE;
return status;
}
priority = context->priority;
callout_guid = context->callout_guid[idx];
filter_guid = context->filter_guid[idx];
device = context->device;
engine_handle = context->engine_handle;
KeReleaseInStackQueuedSpinLock(&lock_handle);
weight = WINDIVERT_FILTER_WEIGHT(priority);
RtlZeroMemory(&scallout, sizeof(scallout));
scallout.calloutKey = callout_guid;
scallout.classifyFn = layer->classify;
scallout.notifyFn = windivert_notify;
scallout.flowDeleteFn = layer->flow_delete;
RtlZeroMemory(&mcallout, sizeof(mcallout));
mcallout.calloutKey = callout_guid;
mcallout.displayData.name = layer->callout_name;
mcallout.displayData.description = layer->callout_desc;
mcallout.applicableLayer = *(layer->layer_guid);
RtlZeroMemory(&filter, sizeof(filter));
filter.filterKey = filter_guid;
filter.layerKey = *(layer->layer_guid);
filter.displayData.name = layer->filter_name;
filter.displayData.description = layer->filter_desc;
filter.action.type = FWP_ACTION_CALLOUT_UNKNOWN;
filter.action.calloutKey = callout_guid;
filter.subLayerKey = *(layer->sublayer_guid);
filter.weight.type = FWP_UINT64;
filter.weight.uint64 = &weight;
filter.rawContext = (UINT64)context;
status = FwpsCalloutRegister0(WdfDeviceWdmGetDeviceObject(device),
&scallout, &callout_id);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to install WFP callout", status);
return status;
}
if (callout_id_ptr != NULL)
{
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
*callout_id_ptr = callout_id;
KeReleaseInStackQueuedSpinLock(&lock_handle);
}
status = FwpmTransactionBegin0(engine_handle, 0);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to begin WFP transaction", status);
FwpsCalloutUnregisterByKey0(&callout_guid);
return status;
}
status = FwpmCalloutAdd0(engine_handle, &mcallout, NULL, NULL);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to add WFP callout", status);
goto windivert_install_callout_error;
}
status = FwpmFilterAdd0(engine_handle, &filter, NULL, NULL);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to add WFP filter", status);
goto windivert_install_callout_error;
}
status = FwpmTransactionCommit0(engine_handle);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to commit WFP transaction", status);
FwpsCalloutUnregisterByKey0(&callout_guid);
return status;
}
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_OPEN)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
FwpsCalloutUnregisterByKey0(&callout_guid);
status = STATUS_INVALID_DEVICE_STATE;
return status;
}
context->installed[idx] = TRUE;
KeReleaseInStackQueuedSpinLock(&lock_handle);
return STATUS_SUCCESS;
windivert_install_callout_error:
FwpmTransactionAbort0(engine_handle);
FwpsCalloutUnregisterByKey0(&callout_guid);
return status;
}
/*
* WinDivert uninstall callouts routine.
*/
static void windivert_uninstall_callouts(context_t context,
context_state_t state)
{
KLOCK_QUEUE_HANDLE lock_handle;
UINT i;
HANDLE engine_handle;
BOOL installed;
GUID callout_guid, filter_guid;
NTSTATUS status;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != state)
{
windivert_uninstall_callouts_error:
KeReleaseInStackQueuedSpinLock(&lock_handle);
status = STATUS_INVALID_DEVICE_STATE;
DEBUG_ERROR("failed to delete filters and callouts", status);
return;
}
engine_handle = context->engine_handle;
KeReleaseInStackQueuedSpinLock(&lock_handle);
status = FwpmTransactionBegin0(engine_handle, 0);
if (!NT_SUCCESS(status))
{
// If the userspace app closes without closing the handle to
// WinDivert, any actions on engine_handle fail because the
// RPC handle was closed first. So, this path is "normal" if
// the user's app crashed or never closed the WinDivert handle.
DEBUG_ERROR("failed to begin WFP transaction", status);
goto windivert_uninstall_callouts_unregister;
}
for (i = 0; i < WINDIVERT_CONTEXT_MAXLAYERS; i++)
{
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != state)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
FwpmTransactionAbort0(engine_handle);
status = STATUS_INVALID_DEVICE_STATE;
DEBUG_ERROR("failed to delete filters and callouts", status);
return;
}
installed = context->installed[i];
callout_guid = context->callout_guid[i];
filter_guid = context->filter_guid[i];
KeReleaseInStackQueuedSpinLock(&lock_handle);
if (!installed)
{
continue;
}
status = FwpmFilterDeleteByKey0(engine_handle, &filter_guid);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to delete filter", status);
break;
}
status = FwpmCalloutDeleteByKey0(engine_handle, &callout_guid);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to delete callout", status);
break;
}
}
if (!NT_SUCCESS(status))
{
FwpmTransactionAbort0(engine_handle);
goto windivert_uninstall_callouts_unregister;
}
status = FwpmTransactionCommit0(engine_handle);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to commit WFP transaction", status);
// continue
}
windivert_uninstall_callouts_unregister:
for (i = 0; i < WINDIVERT_CONTEXT_MAXLAYERS; i++)
{
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != state)
{
goto windivert_uninstall_callouts_error;
}
installed = context->installed[i];
callout_guid = context->callout_guid[i];
context->installed[i] = FALSE;
KeReleaseInStackQueuedSpinLock(&lock_handle);
if (!installed)
{
continue;
}
status = FwpsCalloutUnregisterByKey0(&callout_guid);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to delete callout", status);
continue;
}
}
}
/*
* Divert cleanup routine.
*/
extern VOID windivert_cleanup(IN WDFFILEOBJECT object)
{
KLOCK_QUEUE_HANDLE lock_handle;
PLIST_ENTRY entry;
UINT i;
context_t context = windivert_context_get(object);
flow_t flow;
packet_t work, packet;
WDFQUEUE read_queue;
WDFWORKITEM worker;
LONGLONG timestamp;
BOOL sniff_mode, timeout, forward;
UINT priority;
NTSTATUS status;
DEBUG("CLEANUP: cleaning up WinDivert context (context=%p)", context);
windivert_reflect_close_event(context);
timestamp = KeQueryPerformanceCounter(NULL).QuadPart;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_OPENING &&
context->state != WINDIVERT_CONTEXT_STATE_OPEN)
{
windivert_cleanup_error:
KeReleaseInStackQueuedSpinLock(&lock_handle);
status = STATUS_INVALID_DEVICE_STATE;
DEBUG_ERROR("failed to verify state for cleanup routine", status);
return;
}
context->state = WINDIVERT_CONTEXT_STATE_CLOSING;
sniff_mode = ((context->flags & WINDIVERT_FLAG_SNIFF) != 0);
forward = (context->layer == WINDIVERT_LAYER_NETWORK_FORWARD);
priority = context->priority;
while (!IsListEmpty(&context->flow_set))
{
entry = RemoveHeadList(&context->flow_set);
flow = CONTAINING_RECORD(entry, struct flow_s, entry);
flow->deleted = TRUE;
KeReleaseInStackQueuedSpinLock(&lock_handle);
status = FwpsFlowRemoveContext0(flow->flow_id, flow->layer_id,
flow->callout_id);
if (!NT_SUCCESS(status))
{
windivert_free(flow);
}
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
}
while (!IsListEmpty(&context->packet_queue))
{
entry = RemoveHeadList(&context->packet_queue);
packet = CONTAINING_RECORD(entry, struct packet_s, entry);
context->packet_queue_length--;
context->packet_queue_size -= packet->packet_len;
KeReleaseInStackQueuedSpinLock(&lock_handle);
timeout = WINDIVERT_TIMEOUT(context, packet->timestamp, timestamp);
if (!sniff_mode && !timeout)
{
windivert_reinject_packet(packet);
}
else
{
windivert_free_packet(packet);
}
timestamp = KeQueryPerformanceCounter(NULL).QuadPart;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_CLOSING)
{
goto windivert_cleanup_error;
}
}
while (!IsListEmpty(&context->work_queue))
{
entry = RemoveHeadList(&context->work_queue);
context->work_queue_length--;
KeReleaseInStackQueuedSpinLock(&lock_handle);
work = CONTAINING_RECORD(entry, struct packet_s, entry);
timeout = WINDIVERT_TIMEOUT(context, work->timestamp, timestamp);
if (!sniff_mode && !timeout)
{
windivert_reinject_packet(work);
}
else
{
windivert_free_packet(work);
}
timestamp = KeQueryPerformanceCounter(NULL).QuadPart;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_CLOSING)
{
goto windivert_cleanup_error;
}
}
read_queue = context->read_queue;
KeReleaseInStackQueuedSpinLock(&lock_handle);
WdfIoQueuePurge(read_queue, NULL, NULL);
WdfObjectDelete(read_queue);
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_CLOSING)
{
goto windivert_cleanup_error;
}
worker = context->worker;
KeReleaseInStackQueuedSpinLock(&lock_handle);
WdfWorkItemFlush(worker);
WdfObjectDelete(worker);
}
/*
* WinDivert close routine.
*/
extern VOID windivert_close(IN WDFFILEOBJECT object)
{
KLOCK_QUEUE_HANDLE lock_handle;
context_t context = windivert_context_get(object);
NTSTATUS status;
DEBUG("CLOSE: closing WinDivert context (context=%p)", context);
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_CLOSING)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
status = STATUS_INVALID_DEVICE_STATE;
DEBUG_ERROR("failed to verify state for close routine", status);
return;
}
context->state = WINDIVERT_CONTEXT_STATE_CLOSED;
KeReleaseInStackQueuedSpinLock(&lock_handle);
}
/*
* WinDivert destroy routine.
*/
extern VOID windivert_destroy(IN WDFOBJECT object)
{
KLOCK_QUEUE_HANDLE lock_handle;
context_t context = windivert_context_get((WDFFILEOBJECT)object);
const WINDIVERT_FILTER *filter;
NTSTATUS status;
DEBUG("DESTROY: destroying WinDivert context (context=%p)", context);
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_CLOSED)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
status = STATUS_INVALID_DEVICE_STATE;
DEBUG_ERROR("failed to verify state for destroy routine", status);
return;
}
filter = context->filter;
KeReleaseInStackQueuedSpinLock(&lock_handle);
windivert_uninstall_callouts(context, WINDIVERT_CONTEXT_STATE_CLOSED);
FwpmEngineClose0(context->engine_handle);
windivert_free((PVOID)filter);
}
/*
* WinDivert read routine.
*/
static NTSTATUS windivert_read(context_t context, WDFREQUEST request)
{
KLOCK_QUEUE_HANDLE lock_handle;
NTSTATUS status = STATUS_SUCCESS;
DEBUG("READ: reading diverted packet (context=%p, request=%p)", context,
request);
// Forward the request to the pending read queue:
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_OPEN)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
return STATUS_INVALID_DEVICE_STATE;
}
if ((context->flags & WINDIVERT_FLAG_SEND_ONLY) != 0)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
status = STATUS_INVALID_PARAMETER;
DEBUG_ERROR("failed to inject; send-only flag is set", status);
return status;
}
status = WdfRequestForwardToIoQueue(request, context->read_queue);
KeReleaseInStackQueuedSpinLock(&lock_handle);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to forward I/O request to read queue", status);
return status;
}
// Service the read request:
windivert_read_service(context);
return STATUS_SUCCESS;
}
/*
* WinDivert service a single read request.
*/
static void windivert_read_service_request(context_t context, packet_t packet,
BOOL partial, LONGLONG timestamp, WDFREQUEST request)
{
KLOCK_QUEUE_HANDLE lock_handle;
PLIST_ENTRY entry;
PMDL dst_mdl;
UINT8 *layer_data, *src, *dst;
ULONG dst_len, src_len, read_len;
BOOL timeout;
packet_t new_packet;
req_context_t req_context;
PWINDIVERT_ADDRESS addr;
UINT i, addr_len, addr_len_max;
UINT *addr_len_ptr;
NTSTATUS status;
if (request == NULL)
{
// This occurs if the packet timed out.
windivert_free_packet(packet);
return;
}
DEBUG("SERVICE: servicing read request (request=%p, packet=%p)", request,
packet);
// Get the packet and address buffers:
switch (packet->layer)
{
case WINDIVERT_LAYER_NETWORK:
case WINDIVERT_LAYER_NETWORK_FORWARD:
case WINDIVERT_LAYER_REFLECT:
status = WdfRequestRetrieveOutputWdmMdl(request, &dst_mdl);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to retrieve output MDL", status);
goto windivert_read_service_request_exit;
}
dst = MmGetSystemAddressForMdlSafe(dst_mdl,
NormalPagePriority | no_exec_flag);
if (dst == NULL)
{
status = STATUS_INSUFFICIENT_RESOURCES;
DEBUG_ERROR("failed to get address of output MDL", status);
goto windivert_read_service_request_exit;
}
dst_len = MmGetMdlByteCount(dst_mdl);
break;
case WINDIVERT_LAYER_FLOW:
case WINDIVERT_LAYER_SOCKET:
status = STATUS_SUCCESS;
dst = NULL;
dst_len = 0;
break;
default:
status = STATUS_INVALID_DEVICE_STATE;
DEBUG_ERROR("invalid packet layer", status);
goto windivert_read_service_request_exit;
}
req_context = windivert_req_context_get(request);
addr = req_context->addr;
addr_len = 0;
addr_len_max = (UINT)req_context->addr_len;
addr_len_ptr = req_context->addr_len_ptr;
read_len = 0;
i = 0;
while (TRUE)
{
// Copy the packet data:
switch (packet->layer)
{
case WINDIVERT_LAYER_NETWORK:
case WINDIVERT_LAYER_NETWORK_FORWARD:
case WINDIVERT_LAYER_REFLECT:
if (packet->layer != WINDIVERT_LAYER_REFLECT)
{
src = WINDIVERT_PACKET_DATA_PTR(WINDIVERT_DATA_NETWORK,
packet);
}
else
{
src = WINDIVERT_PACKET_DATA_PTR(WINDIVERT_DATA_REFLECT,
packet);
}
src_len = packet->packet_len;
if (!partial && src_len > dst_len)
{
status = STATUS_BUFFER_TOO_SMALL;
}
src_len = (src_len < dst_len? src_len: dst_len);
RtlCopyMemory(dst, src, src_len);
dst += src_len;
dst_len -= src_len;
read_len += src_len;
break;
default:
break;
}
// Copy the address data:
addr[i].Timestamp = (INT64)packet->timestamp;
addr[i].Layer = packet->layer;
addr[i].Event = packet->event;
addr[i].Outbound = packet->outbound;
addr[i].Loopback = packet->loopback;
addr[i].Impostor = packet->impostor;
addr[i].IPv6 = packet->ipv6;
addr[i].PseudoIPChecksum = packet->pseudo_ip_checksum;
addr[i].PseudoTCPChecksum = packet->pseudo_tcp_checksum;
addr[i].PseudoUDPChecksum = packet->pseudo_udp_checksum;
addr[i].Reserved = 0;
layer_data = (PVOID)packet->data;
switch (packet->layer)
{
case WINDIVERT_LAYER_NETWORK:
case WINDIVERT_LAYER_NETWORK_FORWARD:
RtlCopyMemory(&addr[i].Network, layer_data,
sizeof(WINDIVERT_DATA_NETWORK));
break;
case WINDIVERT_LAYER_FLOW:
RtlCopyMemory(&addr[i].Flow, layer_data,
sizeof(WINDIVERT_DATA_FLOW));
break;
case WINDIVERT_LAYER_SOCKET:
RtlCopyMemory(&addr[i].Socket, layer_data,
sizeof(WINDIVERT_DATA_SOCKET));
break;
case WINDIVERT_LAYER_REFLECT:
RtlCopyMemory(&addr[i].Reflect, layer_data,
sizeof(WINDIVERT_DATA_REFLECT));
break;
default:
break;
}
i++;
addr_len += sizeof(WINDIVERT_ADDRESS);
if (addr_len >= addr_len_max || i >= WINDIVERT_BATCH_MAX)
{
// addr[] is full:
break;
}
if (dst_len < sizeof(WINDIVERT_IPHDR) + sizeof(WINDIVERT_TCPHDR))
{
// Remaining space too small:
break;
}
// Attempt to fill the buffer with more packets:
new_packet = NULL;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state == WINDIVERT_CONTEXT_STATE_OPEN &&
!IsListEmpty(&context->packet_queue))
{
entry = RemoveHeadList(&context->packet_queue);
new_packet = CONTAINING_RECORD(entry, struct packet_s, entry);
timeout = WINDIVERT_TIMEOUT(context, new_packet->timestamp,
timestamp);
if (new_packet->packet_len > dst_len || timeout)
{
// Note: timeouts to be handled elsewhere.
InsertHeadList(&context->packet_queue, entry);
new_packet = NULL;
}
else
{
context->packet_queue_length--;
context->packet_queue_size -= new_packet->packet_len;
}
}
KeReleaseInStackQueuedSpinLock(&lock_handle);
if (new_packet == NULL)
{
// No suitable packet:
break;
}
windivert_free_packet(packet);
packet = new_packet;
}
if (addr_len_ptr != NULL)
{
*addr_len_ptr = addr_len;
}
windivert_read_service_request_exit:
windivert_free_packet(packet);
WdfRequestCompleteWithInformation(request, status, read_len);
}
/*
* WinDivert read request service.
*/
static void windivert_read_service(context_t context)
{
KLOCK_QUEUE_HANDLE lock_handle;
WDFREQUEST request;
PLIST_ENTRY entry;
LONGLONG timestamp;
BOOL partial, timeout;
NTSTATUS status;
packet_t packet;
req_context_t req_context;
PWINDIVERT_ADDRESS addr;
timestamp = KeQueryPerformanceCounter(NULL).QuadPart;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
partial = ((context->flags & WINDIVERT_FLAG_RECV_PARTIAL) != 0);
while (context->state == WINDIVERT_CONTEXT_STATE_OPEN &&
!IsListEmpty(&context->packet_queue))
{
entry = RemoveHeadList(&context->packet_queue);
packet = CONTAINING_RECORD(entry, struct packet_s, entry);
timeout = WINDIVERT_TIMEOUT(context, packet->timestamp, timestamp);
request = NULL;
if (!timeout)
{
status = WdfIoQueueRetrieveNextRequest(context->read_queue,
&request);
if (!NT_SUCCESS(status))
{
InsertHeadList(&context->packet_queue, entry);
break;
}
}
context->packet_queue_length--;
context->packet_queue_size -= packet->packet_len;
KeReleaseInStackQueuedSpinLock(&lock_handle);
windivert_read_service_request(context, packet, partial, timestamp,
request);
timestamp = KeQueryPerformanceCounter(NULL).QuadPart;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
}
if (context->shutdown_recv && context->shutdown_recv_enabled &&
IsListEmpty(&context->packet_queue) &&
IsListEmpty(&context->work_queue))
{
// The handle has shutdown, the queue is empty, and no more packets
// will be queued. Notify any remaining requests.
while (context->state == WINDIVERT_CONTEXT_STATE_OPEN)
{
status = WdfIoQueueRetrieveNextRequest(context->read_queue,
&request);
if (!NT_SUCCESS(status))
{
break;
}
KeReleaseInStackQueuedSpinLock(&lock_handle);
WdfRequestComplete(request, STATUS_PIPE_EMPTY);
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
}
}
KeReleaseInStackQueuedSpinLock(&lock_handle);
}
/*
* WinDivert write routine.
*/
static NTSTATUS windivert_write(context_t context, WDFREQUEST request,
req_context_t req_context)
{
KLOCK_QUEUE_HANDLE lock_handle;
PMDL mdl = NULL, mdl_copy = NULL;
PVOID data, data_copy = NULL;
UINT data_len, packet_len, inject_len;
PWINDIVERT_IPHDR ip_header;
PWINDIVERT_IPV6HDR ipv6_header;
BOOL ipv4;
UINT8 layer;
UINT32 priority;
UINT64 flags, checksums;
HANDLE handle, compl_handle;
PNET_BUFFER_LIST buffers = NULL;
PWINDIVERT_ADDRESS addr;
UINT i, addr_len, addr_len_max;
NTSTATUS status = STATUS_SUCCESS, status_soft_error = STATUS_SUCCESS;
DEBUG("WRITE: writing/injecting a packet (context=%p, request=%p)",
context, request);
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_OPEN)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
status = STATUS_INVALID_DEVICE_STATE;
goto windivert_write_hard_error;
}
if (context->shutdown_send)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
status = STATUS_PIPE_EMPTY;
goto windivert_write_hard_error;
}
layer = context->layer;
priority = context->priority;
flags = context->flags;
KeReleaseInStackQueuedSpinLock(&lock_handle);
if ((flags & WINDIVERT_FLAG_RECV_ONLY) != 0)
{
status = STATUS_INVALID_PARAMETER;
DEBUG_ERROR("failed to inject; recv-only flag is set", status);
goto windivert_write_hard_error;
}
switch (layer)
{
case WINDIVERT_LAYER_FLOW:
case WINDIVERT_LAYER_SOCKET:
case WINDIVERT_LAYER_REFLECT:
status = STATUS_INVALID_PARAMETER;
DEBUG_ERROR("failed to inject at layer", status);
goto windivert_write_hard_error;
default:
break;
}
status = WdfRequestRetrieveOutputWdmMdl(request, &mdl);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to retrieve input MDL", status);
goto windivert_write_hard_error;
}
data = MmGetSystemAddressForMdlSafe(mdl,
NormalPagePriority | no_write_flag | no_exec_flag);
if (data == NULL)
{
status = STATUS_INSUFFICIENT_RESOURCES;
DEBUG_ERROR("failed to get MDL address", status);
goto windivert_write_hard_error;
}
data_len = MmGetMdlByteCount(mdl);
inject_len = 0;
addr = req_context->addr;
addr_len_max = (ULONG)req_context->addr_len;
addr_len = 0;
for (i = 0; addr_len < addr_len_max && i < WINDIVERT_BATCH_MAX; i++,
addr_len += sizeof(WINDIVERT_ADDRESS))
{
buffers = NULL;
mdl_copy = NULL;
data_copy = NULL;
// Get the packet length:
if (data_len < sizeof(WINDIVERT_IPHDR))
{
windivert_write_too_small_packet:
status = STATUS_BUFFER_TOO_SMALL;
DEBUG_ERROR("failed to inject partial packet", status);
goto windivert_write_hard_error;
}
ip_header = (PWINDIVERT_IPHDR)data;
switch (ip_header->Version)
{
case 4:
packet_len = RtlUshortByteSwap(ip_header->Length);
ipv4 = TRUE;
break;
case 6:
if (data_len < sizeof(WINDIVERT_IPV6HDR))
{
goto windivert_write_too_small_packet;
}
ipv6_header = (PWINDIVERT_IPV6HDR)data;
packet_len = RtlUshortByteSwap(ipv6_header->Length) +
sizeof(WINDIVERT_IPV6HDR);
ipv4 = FALSE;
break;
default:
status = STATUS_INVALID_PARAMETER;
DEBUG_ERROR("failed to inject non-IP packet", status);
goto windivert_write_hard_error;
}
if (data_len < packet_len)
{
goto windivert_write_too_small_packet;
}
// Copy packet data:
data_copy = windivert_malloc(packet_len, FALSE);
if (data_copy == NULL)
{
status = STATUS_INSUFFICIENT_RESOURCES;
DEBUG_ERROR("failed to allocate memory for injected packet data",
status);
goto windivert_write_hard_error;
}
RtlCopyMemory(data_copy, data, packet_len);
// Fix checksums:
if (addr[i].PseudoIPChecksum != 0 || addr[i].PseudoTCPChecksum != 0 ||
addr[i].PseudoUDPChecksum != 0)
{
checksums =
(addr[i].PseudoIPChecksum? 0:
WINDIVERT_HELPER_NO_IP_CHECKSUM) |
(addr[i].PseudoTCPChecksum? 0:
WINDIVERT_HELPER_NO_TCP_CHECKSUM) |
(addr[i].PseudoUDPChecksum? 0:
WINDIVERT_HELPER_NO_UDP_CHECKSUM) |
WINDIVERT_HELPER_NO_ICMP_CHECKSUM |
WINDIVERT_HELPER_NO_ICMPV6_CHECKSUM;
WinDivertHelperCalcChecksums(data_copy, packet_len, NULL,
checksums);
}
// Decrement TTL for impostor packets:
if (addr[i].Impostor && !windivert_decrement_ttl(data_copy, ipv4))
{
status_soft_error = STATUS_HOPLIMIT_EXCEEDED;
windivert_free(data_copy);
goto windivert_write_loop;
}
// Allocate packet:
mdl_copy = IoAllocateMdl(data_copy, packet_len, FALSE, FALSE, NULL);
if (mdl_copy == NULL)
{
status = STATUS_INSUFFICIENT_RESOURCES;
DEBUG_ERROR("failed to allocate MDL for injected packet", status);
goto windivert_write_hard_error;
}
MmBuildMdlForNonPagedPool(mdl_copy);
status = FwpsAllocateNetBufferAndNetBufferList0(nbl_pool_handle, 0, 0,
mdl_copy, 0, packet_len, &buffers);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to create NET_BUFFER_LIST for injected packet",
status);
goto windivert_write_hard_error;
}
// Inject packet:
handle = (ipv4? inject_handle: injectv6_handle);
if (layer == WINDIVERT_LAYER_NETWORK_FORWARD)
{
status = FwpsInjectForwardAsync0(handle, (HANDLE)priority, 0,
(ipv4? AF_INET: AF_INET6), UNSPECIFIED_COMPARTMENT_ID,
addr[i].Network.IfIdx, buffers, windivert_inject_complete,
data_copy);
}
else if (addr[i].Outbound != 0)
{
status = FwpsInjectNetworkSendAsync0(handle, (HANDLE)priority, 0,
UNSPECIFIED_COMPARTMENT_ID, buffers, windivert_inject_complete,
data_copy);
}
else
{
status = FwpsInjectNetworkReceiveAsync0(handle, (HANDLE)priority, 0,
UNSPECIFIED_COMPARTMENT_ID, addr[i].Network.IfIdx,
addr[i].Network.SubIfIdx, buffers, windivert_inject_complete,
data_copy);
}
if (!NT_SUCCESS(status))
{
status_soft_error = status;
FwpsFreeNetBufferList0(buffers);
IoFreeMdl(mdl_copy);
windivert_free(data_copy);
}
windivert_write_loop:
// Reset state:
inject_len += packet_len;
data = (PVOID)((UINT8 *)data + packet_len);
data_len -= packet_len;
}
// Note: status_soft_error is for "soft" errors that do not prevent other
// batched packets from being injected.
WdfRequestCompleteWithInformation(request, status_soft_error, inject_len);
return STATUS_SUCCESS;
windivert_write_hard_error:
// Request to be completed in windivert_ioctl()
if (buffers != NULL)
{
FwpsFreeNetBufferList0(buffers);
}
if (mdl_copy != NULL)
{
IoFreeMdl(mdl_copy);
}
windivert_free(data_copy);
return status;
}
/*
* WinDivert inject complete routine.
*/
static void NTAPI windivert_inject_complete(VOID *data,
NET_BUFFER_LIST *buffers, BOOLEAN dispatch_level)
{
PMDL mdl;
PNET_BUFFER buffer;
UNREFERENCED_PARAMETER(dispatch_level);
buffer = NET_BUFFER_LIST_FIRST_NB(buffers);
mdl = NET_BUFFER_FIRST_MDL(buffer);
windivert_free(data);
IoFreeMdl(mdl);
FwpsFreeNetBufferList0(buffers);
}
/*
* WinDivert reinject complete routine.
*/
static void NTAPI windivert_reinject_complete(VOID *context,
NET_BUFFER_LIST *buffers, BOOLEAN dispatch_level)
{
PMDL mdl;
PNET_BUFFER buffer;
packet_t packet;
UNREFERENCED_PARAMETER(dispatch_level);
buffer = NET_BUFFER_LIST_FIRST_NB(buffers);
packet = (packet_t)context;
mdl = NET_BUFFER_FIRST_MDL(buffer);
windivert_free_packet(packet);
IoFreeMdl(mdl);
FwpsFreeNetBufferList0(buffers);
}
/*
* WinDivert caller context preprocessing.
*/
VOID windivert_caller_context(IN WDFDEVICE device, IN WDFREQUEST request)
{
PCHAR inbuf;
size_t inbuflen;
WDF_REQUEST_PARAMETERS params;
WDFMEMORY memobj;
PWINDIVERT_ADDRESS addr = NULL;
UINT *addr_len_ptr = NULL;
UINT64 addr_len = 0;
PWINDIVERT_IOCTL ioctl;
WDF_OBJECT_ATTRIBUTES attributes;
req_context_t req_context = NULL;
NTSTATUS status;
WDF_REQUEST_PARAMETERS_INIT(¶ms);
WdfRequestGetParameters(request, ¶ms);
if (params.Type != WdfRequestTypeDeviceControl)
{
goto windivert_caller_context_exit;
}
// Get and verify the input buffer.
status = WdfRequestRetrieveInputBuffer(request, 0, &inbuf, &inbuflen);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to retrieve input buffer", status);
goto windivert_caller_context_error;
}
if (inbuflen != sizeof(WINDIVERT_IOCTL))
{
status = STATUS_INVALID_PARAMETER;
DEBUG_ERROR("input buffer not an ioctl message header", status);
goto windivert_caller_context_error;
}
// Probe and lock user buffers here (if required).
WDF_OBJECT_ATTRIBUTES_INIT_CONTEXT_TYPE(&attributes, req_context_s);
status = WdfObjectAllocateContext(request, &attributes, &req_context);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to allocate request context for ioctl", status);
goto windivert_caller_context_error;
}
switch (params.Parameters.DeviceIoControl.IoControlCode)
{
case IOCTL_WINDIVERT_RECV:
ioctl = (PWINDIVERT_IOCTL)inbuf;
addr = (PWINDIVERT_ADDRESS)ioctl->arg1;
addr_len_ptr = (UINT *)ioctl->arg2;
addr_len = sizeof(WINDIVERT_ADDRESS);
if (addr_len_ptr != NULL)
{
status = WdfRequestProbeAndLockUserBufferForWrite(request,
addr_len_ptr, sizeof(UINT), &memobj);
if (!NT_SUCCESS(status))
{
status = STATUS_INVALID_PARAMETER;
DEBUG_ERROR("invalid address length pointer for RECV ioctl",
status);
goto windivert_caller_context_error;
}
addr_len_ptr = (UINT *)WdfMemoryGetBuffer(memobj, NULL);
addr_len = *addr_len_ptr;
if (addr_len < sizeof(WINDIVERT_ADDRESS) ||
addr_len > WINDIVERT_BATCH_MAX * sizeof(WINDIVERT_ADDRESS))
{
status = STATUS_INVALID_PARAMETER;
DEBUG_ERROR("out-of-range address length for RECV ioctl",
status);
goto windivert_caller_context_error;
}
}
if (addr == NULL)
{
status = STATUS_INVALID_PARAMETER;
DEBUG_ERROR("null address for RECV ioctl", status);
goto windivert_caller_context_error;
}
status = WdfRequestProbeAndLockUserBufferForWrite(request, addr,
addr_len, &memobj);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("invalid address for RECV ioctl", status);
goto windivert_caller_context_error;
}
addr = (PWINDIVERT_ADDRESS)WdfMemoryGetBuffer(memobj, NULL);
break;
case IOCTL_WINDIVERT_SEND:
ioctl = (PWINDIVERT_IOCTL)inbuf;
addr = (PWINDIVERT_ADDRESS)ioctl->arg1;
addr_len = ioctl->arg2;
if (addr_len < sizeof(WINDIVERT_ADDRESS) ||
addr_len > WINDIVERT_BATCH_MAX * sizeof(WINDIVERT_ADDRESS))
{
status = STATUS_INVALID_PARAMETER;
DEBUG_ERROR("out-of-range address length for RECV ioctl",
status);
goto windivert_caller_context_error;
}
if (addr == NULL)
{
status = STATUS_INVALID_PARAMETER;
DEBUG_ERROR("null address for SEND ioctl", status);
goto windivert_caller_context_error;
}
status = WdfRequestProbeAndLockUserBufferForRead(request, addr,
addr_len, &memobj);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("invalid address for SEND ioctl", status);
goto windivert_caller_context_error;
}
addr = (PWINDIVERT_ADDRESS)WdfMemoryGetBuffer(memobj, NULL);
break;
case IOCTL_WINDIVERT_SHUTDOWN:
case IOCTL_WINDIVERT_START_FILTER:
case IOCTL_WINDIVERT_SET_LAYER:
case IOCTL_WINDIVERT_SET_PRIORITY:
case IOCTL_WINDIVERT_SET_FLAGS:
case IOCTL_WINDIVERT_SET_PARAM:
case IOCTL_WINDIVERT_GET_PARAM:
break;
default:
status = STATUS_INVALID_DEVICE_REQUEST;
DEBUG_ERROR("failed to complete I/O control; invalid request",
status);
goto windivert_caller_context_error;
}
req_context->addr = addr;
req_context->addr_len = (UINT)addr_len;
req_context->addr_len_ptr = addr_len_ptr;
windivert_caller_context_exit:
status = WdfDeviceEnqueueRequest(device, request);
windivert_caller_context_error:
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to enqueue request", status);
WdfRequestComplete(request, status);
}
}
/*
* WinDivert I/O control.
*/
extern VOID windivert_ioctl(IN WDFQUEUE queue, IN WDFREQUEST request,
IN size_t out_length, IN size_t in_length, IN ULONG code)
{
KLOCK_QUEUE_HANDLE lock_handle;
PCHAR inbuf, outbuf;
size_t inbuflen, outbuflen, ioctl_filter_len;
PWINDIVERT_IOCTL ioctl;
const WINDIVERT_FILTER *ioctl_filter, *filter;
UINT8 layer;
INT16 priority;
UINT64 flags;
req_context_t req_context;
NTSTATUS status = STATUS_SUCCESS;
context_t context =
windivert_context_get(WdfRequestGetFileObject(request));
UINT64 value, *valptr;
UNREFERENCED_PARAMETER(queue);
DEBUG("IOCTL: I/O control request (context=%p)", context);
// Get the buffers and do sanity checks.
status = WdfRequestRetrieveInputBuffer(request, 0, &inbuf, &inbuflen);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to retrieve input buffer", status);
goto windivert_ioctl_exit;
}
switch (code)
{
case IOCTL_WINDIVERT_START_FILTER: case IOCTL_WINDIVERT_GET_PARAM:
status = WdfRequestRetrieveOutputBuffer(request, 0, &outbuf,
&outbuflen);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to retrieve output buffer", status);
goto windivert_ioctl_exit;
}
break;
default:
outbuf = NULL;
outbuflen = 0;
break;
}
// Handle the ioctl:
switch (code)
{
case IOCTL_WINDIVERT_RECV:
status = windivert_read(context, request);
if (NT_SUCCESS(status))
{
return;
}
break;
case IOCTL_WINDIVERT_SEND:
req_context = windivert_req_context_get(request);
status = windivert_write(context, request, req_context);
if (NT_SUCCESS(status))
{
return;
}
break;
case IOCTL_WINDIVERT_SHUTDOWN:
{
UINT64 how;
ioctl = (PWINDIVERT_IOCTL)inbuf;
how = ioctl->arg1;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_OPEN)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
status = STATUS_INVALID_DEVICE_STATE;
goto windivert_ioctl_exit;
}
switch (how)
{
case WINDIVERT_SHUTDOWN_RECV:
context->shutdown_recv = TRUE;
break;
case WINDIVERT_SHUTDOWN_SEND:
context->shutdown_send = TRUE;
break;
case WINDIVERT_SHUTDOWN_BOTH:
context->shutdown_recv = context->shutdown_send = TRUE;
break;
default:
KeReleaseInStackQueuedSpinLock(&lock_handle);
status = STATUS_INVALID_PARAMETER;
DEBUG_ERROR("failed to shutdown handle; invalid how",
status);
goto windivert_ioctl_exit;
}
KeReleaseInStackQueuedSpinLock(&lock_handle);
windivert_read_service(context);
break;
}
case IOCTL_WINDIVERT_START_FILTER:
{
BOOL inbound, outbound, ipv4, ipv6;
PIRP irp;
LONGLONG timestamp;
UINT64 filter_flags;
UINT32 process_id;
UINT8 filter_len;
ioctl = (PWINDIVERT_IOCTL)inbuf;
filter_flags = ioctl->arg1;
if ((filter_flags & ~WINDIVERT_FILTER_FLAGS_ALL) != 0)
{
status = STATUS_INVALID_PARAMETER;
DEBUG_ERROR("failed to start filter; invalid flags", status);
goto windivert_ioctl_exit;
}
filter = NULL;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_OPENING)
{
windivert_ioctl_bad_start_state:
KeReleaseInStackQueuedSpinLock(&lock_handle);
windivert_free((PVOID)filter);
status = STATUS_INVALID_DEVICE_STATE;
goto windivert_ioctl_exit;
}
context->state = WINDIVERT_CONTEXT_STATE_OPEN;
layer = context->layer;
KeReleaseInStackQueuedSpinLock(&lock_handle);
ioctl_filter = (const WINDIVERT_FILTER *)outbuf;
ioctl_filter_len = outbuflen;
filter = windivert_filter_compile(ioctl_filter, ioctl_filter_len,
layer);
if (filter == NULL)
{
status = STATUS_INVALID_PARAMETER;
DEBUG_ERROR("failed to compile filter", status);
goto windivert_ioctl_exit;
}
filter_len = ioctl_filter_len / sizeof(WINDIVERT_FILTER);
irp = WdfRequestWdmGetIrp(request);
process_id = (UINT32)IoGetRequestorProcessId(irp);
timestamp = KeQueryPerformanceCounter(NULL).QuadPart;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_OPEN)
{
goto windivert_ioctl_bad_start_state;
}
flags = context->flags;
switch (layer)
{
case WINDIVERT_LAYER_FLOW:
case WINDIVERT_LAYER_REFLECT:
if ((flags & WINDIVERT_FLAG_SNIFF) == 0 ||
(flags & WINDIVERT_FLAG_RECV_ONLY) == 0)
{
goto windivert_ioctl_bad_start_state;
}
break;
case WINDIVERT_LAYER_SOCKET:
if ((flags & WINDIVERT_FLAG_RECV_ONLY) == 0)
{
goto windivert_ioctl_bad_start_state;
}
break;
default:
break;
}
context->filter = filter;
context->filter_len = filter_len;
context->filter_flags = filter_flags;
context->reflect.data.Timestamp = timestamp;
context->reflect.data.ProcessId = process_id;
context->reflect.data.Layer = context->layer;
context->reflect.data.Flags = context->flags;
context->reflect.data.Priority = context->priority16;
context->reflect.open = FALSE;
context->shutdown_recv_enabled =
(layer != WINDIVERT_LAYER_REFLECT);
KeReleaseInStackQueuedSpinLock(&lock_handle);
windivert_reflect_open_event(context);
status = windivert_install_callouts(context, layer, filter_flags);
break;
}
case IOCTL_WINDIVERT_SET_LAYER:
{
UINT64 layer;
ioctl = (PWINDIVERT_IOCTL)inbuf;
layer = ioctl->arg1;
switch (layer)
{
case WINDIVERT_LAYER_NETWORK:
case WINDIVERT_LAYER_NETWORK_FORWARD:
case WINDIVERT_LAYER_FLOW:
case WINDIVERT_LAYER_SOCKET:
case WINDIVERT_LAYER_REFLECT:
break;
default:
status = STATUS_INVALID_PARAMETER;
DEBUG_ERROR("failed to set layer; invalid value", status);
goto windivert_ioctl_exit;
}
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_OPENING)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
status = STATUS_INVALID_DEVICE_STATE;
goto windivert_ioctl_exit;
}
context->layer = (WINDIVERT_LAYER)layer;
KeReleaseInStackQueuedSpinLock(&lock_handle);
break;
}
case IOCTL_WINDIVERT_SET_PRIORITY:
{
UINT32 priority32;
INT64 priority64;
ioctl = (PWINDIVERT_IOCTL)inbuf;
priority64 = (INT64)ioctl->arg1 - WINDIVERT_PRIORITY_MAX;
if (priority64 < WINDIVERT_PRIORITY_MIN ||
priority64 > WINDIVERT_PRIORITY_MAX)
{
status = STATUS_INVALID_PARAMETER;
DEBUG_ERROR("failed to set priority; value out of range",
status);
goto windivert_ioctl_exit;
}
priority32 = windivert_context_priority(priority64);
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_OPENING)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
status = STATUS_INVALID_DEVICE_STATE;
goto windivert_ioctl_exit;
}
context->priority16 = (INT16)priority64;
context->priority = priority32;
KeReleaseInStackQueuedSpinLock(&lock_handle);
break;
}
case IOCTL_WINDIVERT_SET_FLAGS:
{
UINT64 flags;
ioctl = (PWINDIVERT_IOCTL)inbuf;
flags = ioctl->arg1;
if (!WINDIVERT_FLAGS_VALID(flags))
{
status = STATUS_INVALID_PARAMETER;
DEBUG_ERROR("failed to set flags; invalid flags value",
status);
goto windivert_ioctl_exit;
}
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_OPENING)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
status = STATUS_INVALID_DEVICE_STATE;
goto windivert_ioctl_exit;
}
context->flags = flags;
KeReleaseInStackQueuedSpinLock(&lock_handle);
break;
}
case IOCTL_WINDIVERT_SET_PARAM:
{
UINT64 param, value;
ioctl = (PWINDIVERT_IOCTL)inbuf;
param = ioctl->arg1;
value = ioctl->arg2;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_OPEN)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
status = STATUS_INVALID_DEVICE_STATE;
goto windivert_ioctl_exit;
}
switch (param)
{
case WINDIVERT_PARAM_QUEUE_LEN:
if (value < WINDIVERT_PARAM_QUEUE_LEN_MIN ||
value > WINDIVERT_PARAM_QUEUE_LEN_MAX)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
status = STATUS_INVALID_PARAMETER;
DEBUG_ERROR("failed to set queue length; invalid "
"value", status);
goto windivert_ioctl_exit;
}
context->packet_queue_maxlength = (ULONG)value;
break;
case WINDIVERT_PARAM_QUEUE_TIME:
if (value < WINDIVERT_PARAM_QUEUE_TIME_MIN ||
value > WINDIVERT_PARAM_QUEUE_TIME_MAX)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
status = STATUS_INVALID_PARAMETER;
DEBUG_ERROR("failed to set queue time; invalid "
"value", status);
goto windivert_ioctl_exit;
}
context->packet_queue_maxcounts =
(LONGLONG)value * counts_per_ms;
context->packet_queue_maxtime = (ULONG)value;
break;
case WINDIVERT_PARAM_QUEUE_SIZE:
if (value < WINDIVERT_PARAM_QUEUE_SIZE_MIN ||
value > WINDIVERT_PARAM_QUEUE_SIZE_MAX)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
status = STATUS_INVALID_PARAMETER;
DEBUG_ERROR("failed to set queue size; invalid "
"value", status);
goto windivert_ioctl_exit;
}
context->packet_queue_maxsize = (ULONG)value;
break;
default:
KeReleaseInStackQueuedSpinLock(&lock_handle);
status = STATUS_INVALID_PARAMETER;
DEBUG_ERROR("failed to set parameter; invalid parameter",
status);
goto windivert_ioctl_exit;
}
KeReleaseInStackQueuedSpinLock(&lock_handle);
break;
}
case IOCTL_WINDIVERT_GET_PARAM:
{
UINT64 param;
ioctl = (PWINDIVERT_IOCTL)inbuf;
param = ioctl->arg1;
if (outbuflen != sizeof(UINT64))
{
status = STATUS_INVALID_PARAMETER;
DEBUG_ERROR("failed to get parameter; invalid output "
"buffer size", status);
goto windivert_ioctl_exit;
}
valptr = (UINT64 *)outbuf;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_OPEN)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
status = STATUS_INVALID_DEVICE_STATE;
goto windivert_ioctl_exit;
}
switch (param)
{
case WINDIVERT_PARAM_QUEUE_LEN:
*valptr = context->packet_queue_maxlength;
break;
case WINDIVERT_PARAM_QUEUE_TIME:
*valptr = context->packet_queue_maxtime;
break;
case WINDIVERT_PARAM_QUEUE_SIZE:
*valptr = context->packet_queue_maxsize;
break;
default:
KeReleaseInStackQueuedSpinLock(&lock_handle);
status = STATUS_INVALID_PARAMETER;
DEBUG_ERROR("failed to get parameter; invalid parameter",
status);
goto windivert_ioctl_exit;
}
KeReleaseInStackQueuedSpinLock(&lock_handle);
break;
}
default:
status = STATUS_INVALID_DEVICE_REQUEST;
DEBUG_ERROR("failed to complete I/O control; invalid request",
status);
break;
}
windivert_ioctl_exit:
WdfRequestComplete(request, status);
}
/*
* WinDivert notify function.
*/
static NTSTATUS windivert_notify(IN FWPS_CALLOUT_NOTIFY_TYPE type,
IN const GUID *filter_key, IN const FWPS_FILTER0 *filter)
{
UNREFERENCED_PARAMETER(type);
UNREFERENCED_PARAMETER(filter_key);
UNREFERENCED_PARAMETER(filter);
return STATUS_SUCCESS;
}
/*
* WinDivert get fixed values.
*/
static UINT8 windivert_get_val8(const FWPS_INCOMING_VALUES0 *fixed_vals,
int idx)
{
FWP_VALUE0 value = fixed_vals->incomingValue[idx].value;
return (value.type != FWP_UINT8? 0: value.uint8);
}
static UINT16 windivert_get_val16(const FWPS_INCOMING_VALUES0 *fixed_vals,
int idx)
{
FWP_VALUE0 value = fixed_vals->incomingValue[idx].value;
return (value.type != FWP_UINT16? 0: value.uint16);
}
static UINT32 windivert_get_val32(const FWPS_INCOMING_VALUES0 *fixed_vals,
int idx)
{
FWP_VALUE0 value = fixed_vals->incomingValue[idx].value;
return (value.type != FWP_UINT32? 0: value.uint32);
}
static void windivert_get_ipv4_addr(const FWPS_INCOMING_VALUES0 *fixed_vals,
int idx, UINT32 *addr)
{
FWP_VALUE0 value = fixed_vals->incomingValue[idx].value;
addr[2] = addr[3] = 0;
if (value.type != FWP_UINT32)
{
addr[0] = addr[1] = 0;
}
else
{
addr[0] = value.uint32;
addr[1] = 0x0000FFFF;
}
}
static void windivert_get_ipv6_addr(const FWPS_INCOMING_VALUES0 *fixed_vals,
int idx, UINT32 *addr)
{
UINT8 *addr8 = (UINT8 *)addr;
INT i;
FWP_VALUE0 value = fixed_vals->incomingValue[idx].value;
if (value.type != FWP_BYTE_ARRAY16_TYPE)
{
RtlZeroMemory(&addr, 16);
return;
}
for (i = 16-1; i >= 0; i--)
{
addr8[16-i-1] = value.byteArray16->byteArray16[i];
}
}
/*
* WinDivert classify outbound IPv4 function.
*/
static void windivert_outbound_network_v4_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result)
{
WINDIVERT_DATA_NETWORK network_data;
BOOL loopback;
if ((result->rights & FWPS_RIGHT_ACTION_WRITE) == 0 || data == NULL)
{
return;
}
network_data.IfIdx = windivert_get_val32(fixed_vals,
FWPS_FIELD_OUTBOUND_IPPACKET_V4_INTERFACE_INDEX);
network_data.SubIfIdx = windivert_get_val32(fixed_vals,
FWPS_FIELD_OUTBOUND_IPPACKET_V4_SUB_INTERFACE_INDEX);
loopback = ((windivert_get_val32(fixed_vals,
FWPS_FIELD_OUTBOUND_IPPACKET_V4_FLAGS) &
FWP_CONDITION_FLAG_IS_LOOPBACK) != 0);
windivert_network_classify((context_t)filter->context, &network_data,
/*ipv4=*/TRUE, /*outbound=*/TRUE, loopback, /*advance=*/0, data,
result);
}
/*
* WinDivert classify outbound IPv6 function.
*/
static void windivert_outbound_network_v6_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result)
{
WINDIVERT_DATA_NETWORK network_data;
BOOL loopback;
if ((result->rights & FWPS_RIGHT_ACTION_WRITE) == 0 || data == NULL)
{
return;
}
network_data.IfIdx = windivert_get_val32(fixed_vals,
FWPS_FIELD_OUTBOUND_IPPACKET_V6_INTERFACE_INDEX);
network_data.SubIfIdx = windivert_get_val32(fixed_vals,
FWPS_FIELD_OUTBOUND_IPPACKET_V6_SUB_INTERFACE_INDEX);
loopback = ((windivert_get_val32(fixed_vals,
FWPS_FIELD_OUTBOUND_IPPACKET_V6_FLAGS) &
FWP_CONDITION_FLAG_IS_LOOPBACK) != 0);
windivert_network_classify((context_t)filter->context, &network_data,
/*ipv4=*/FALSE, /*outbound=*/TRUE, loopback, /*advance=*/0,
data, result);
}
/*
* WinDivert classify inbound IPv4 function.
*/
static void windivert_inbound_network_v4_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result)
{
WINDIVERT_DATA_NETWORK network_data;
UINT advance;
BOOL loopback;
if ((result->rights & FWPS_RIGHT_ACTION_WRITE) == 0 || data == NULL)
{
return;
}
loopback = ((windivert_get_val32(fixed_vals,
FWPS_FIELD_INBOUND_IPPACKET_V4_FLAGS) &
FWP_CONDITION_FLAG_IS_LOOPBACK) != 0);
if (loopback)
{
result->actionType = FWP_ACTION_CONTINUE;
return;
}
network_data.IfIdx = windivert_get_val32(fixed_vals,
FWPS_FIELD_INBOUND_IPPACKET_V4_INTERFACE_INDEX);
network_data.SubIfIdx = windivert_get_val32(fixed_vals,
FWPS_FIELD_INBOUND_IPPACKET_V4_SUB_INTERFACE_INDEX);
advance = meta_vals->ipHeaderSize;
windivert_network_classify((context_t)filter->context, &network_data,
/*ipv4=*/TRUE, /*outbound=*/FALSE, loopback, advance, data, result);
}
/*
* WinDivert classify inbound IPv6 function.
*/
static void windivert_inbound_network_v6_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result)
{
WINDIVERT_DATA_NETWORK network_data;
UINT advance;
BOOL loopback;
if ((result->rights & FWPS_RIGHT_ACTION_WRITE) == 0 || data == NULL)
{
return;
}
loopback = ((windivert_get_val32(fixed_vals,
FWPS_FIELD_INBOUND_IPPACKET_V6_FLAGS) &
FWP_CONDITION_FLAG_IS_LOOPBACK) != 0);
if (loopback)
{
result->actionType = FWP_ACTION_CONTINUE;
return;
}
network_data.IfIdx = windivert_get_val32(fixed_vals,
FWPS_FIELD_INBOUND_IPPACKET_V6_INTERFACE_INDEX);
network_data.SubIfIdx = windivert_get_val32(fixed_vals,
FWPS_FIELD_INBOUND_IPPACKET_V6_SUB_INTERFACE_INDEX);
advance = meta_vals->ipHeaderSize;
windivert_network_classify((context_t)filter->context, &network_data,
/*ipv4=*/FALSE, /*outbound=*/FALSE, loopback, advance, data, result);
}
/*
* WinDivert classify forward IPv4 function.
*/
static void windivert_forward_network_v4_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result)
{
WINDIVERT_DATA_NETWORK network_data;
if ((result->rights & FWPS_RIGHT_ACTION_WRITE) == 0 || data == NULL)
{
return;
}
network_data.IfIdx = windivert_get_val32(fixed_vals,
FWPS_FIELD_IPFORWARD_V4_DESTINATION_INTERFACE_INDEX);
network_data.SubIfIdx = 0;
windivert_network_classify((context_t)filter->context, &network_data,
/*ipv4=*/TRUE, /*outbound=*/TRUE, /*loopback=*/FALSE, /*advance=*/0,
data, result);
}
/*
* WinDivert classify forward IPv6 function.
*/
static void windivert_forward_network_v6_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result)
{
WINDIVERT_DATA_NETWORK network_data;
if ((result->rights & FWPS_RIGHT_ACTION_WRITE) == 0 || data == NULL)
{
return;
}
network_data.IfIdx = windivert_get_val32(fixed_vals,
FWPS_FIELD_IPFORWARD_V6_DESTINATION_INTERFACE_INDEX);
network_data.SubIfIdx = 0;
windivert_network_classify((context_t)filter->context, &network_data,
/*ipv4=*/FALSE, /*outbound=*/TRUE, /*loopback=*/FALSE, /*advance=*/0,
data, result);
}
/*
* WinDivert network classify function.
*/
static void windivert_network_classify(context_t context,
IN PWINDIVERT_DATA_NETWORK network_data, IN BOOL ipv4, IN BOOL outbound,
IN BOOL loopback, IN UINT advance, IN OUT void *data,
OUT FWPS_CLASSIFY_OUT0 *result)
{
KLOCK_QUEUE_HANDLE lock_handle;
FWPS_PACKET_INJECTION_STATE packet_state;
HANDLE packet_context;
UINT32 priority, packet_priority;
UINT64 flags;
WINDIVERT_LAYER layer;
PNET_BUFFER_LIST buffers;
PNET_BUFFER buffer, buffer_fst, buffer_itr;
BOOL impostor, sniff_mode, ok;
WDFOBJECT object;
PLIST_ENTRY old_entry;
const WINDIVERT_FILTER *filter;
LONGLONG timestamp;
NTSTATUS status;
result->actionType = FWP_ACTION_CONTINUE;
buffers = (PNET_BUFFER_LIST)data;
buffer = NET_BUFFER_LIST_FIRST_NB(buffers);
if (NET_BUFFER_LIST_NEXT_NBL(buffers) != NULL)
{
// This is a fragment group. This can be ignored since each fragment
// should have already been indicated.
return;
}
if (ipv4)
{
packet_state = FwpsQueryPacketInjectionState0(inject_handle, buffers,
&packet_context);
}
else
{
packet_state = FwpsQueryPacketInjectionState0(injectv6_handle,
buffers, &packet_context);
}
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_OPEN ||
context->shutdown_recv)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
return;
}
flags = context->flags;
priority = context->priority;
filter = context->filter;
layer = context->layer;
object = (WDFOBJECT)context->object;
WdfObjectReference(object);
KeReleaseInStackQueuedSpinLock(&lock_handle);
impostor = FALSE;
if (packet_state == FWPS_PACKET_INJECTED_BY_SELF ||
packet_state == FWPS_PACKET_PREVIOUSLY_INJECTED_BY_SELF)
{
packet_priority = (UINT32)packet_context;
if (packet_priority >= priority)
{
WdfObjectDereference(object);
return;
}
}
else if (packet_state == FWPS_PACKET_INJECTED_BY_OTHER)
{
// This is a packet injected by another driver, possibly an older
// version of WinDivert. To prevent block-clone-reinject infinite
// loops, we mark this packet as an "impostor".
impostor = TRUE;
}
// Get the timestamp.
timestamp = KeQueryPerformanceCounter(NULL).QuadPart;
// Retreat the NET_BUFFER to the IP header, if necessary.
// If (advance != 0) then this must be in the inbound path, and the
// NET_BUFFER_LIST must contain exactly one NET_BUFFER.
if (advance != 0)
{
status = NdisRetreatNetBufferDataStart(buffer, advance, 0, NULL);
if (!NT_SUCCESS(status))
{
WdfObjectDereference(object);
return;
}
}
/*
* This code is complicated by the fact the a single NET_BUFFER_LIST
* may contain several NET_BUFFER structures. Each NET_BUFFER needs to
* be filtered independently. To achieve this we do the following:
* 1) First check if any NET_BUFFER passes the filter.
* 2) If no, then CONTINUE the entire NET_BUFFER_LIST.
* 3) Else, split the NET_BUFFER_LIST into individual NET_BUFFERs; and
* either queue or re-inject based on the filter.
*/
// Find the first NET_BUFFER we need to queue:
buffer_fst = buffer;
do
{
BOOL match = windivert_filter(buffer_fst, layer, (PVOID)network_data,
timestamp, /*event=*/WINDIVERT_EVENT_NETWORK_PACKET, ipv4,
outbound, loopback, impostor, filter);
if (match)
{
break;
}
buffer_fst = NET_BUFFER_NEXT_NB(buffer_fst);
}
while (buffer_fst != NULL);
// If no packet matches the filter, CONTINUE the entire NET_BUFFER_LIST.
if (buffer_fst == NULL)
{
WdfObjectDereference(object);
if (advance != 0)
{
NdisAdvanceNetBufferDataStart(buffer, advance, FALSE, NULL);
}
return;
}
// At least one packet matches the filter. Queue or re-inject all
// packets depending on whether they match the filter or not.
// STEP (1): Queue all non-matching packets up to buffer_fst.
buffer_itr = buffer;
sniff_mode = ((flags & WINDIVERT_FLAG_SNIFF) != 0);
while (!sniff_mode && buffer_itr != buffer_fst)
{
ok = windivert_queue_work(context, (PVOID)buffer_itr,
NET_BUFFER_DATA_LENGTH(buffer_itr), buffers, layer,
(PVOID)network_data, /*event=*/WINDIVERT_EVENT_NETWORK_PACKET,
flags, priority, ipv4, outbound, loopback, impostor,
/*match=*/FALSE, timestamp);
if (!ok)
{
goto windivert_network_classify_exit;
}
buffer_itr = NET_BUFFER_NEXT_NB(buffer_itr);
}
// STEP (2): Queue the first matching packet buffer_fst:
ok = windivert_queue_work(context, (PVOID)buffer_itr,
NET_BUFFER_DATA_LENGTH(buffer_itr), buffers, layer,
(PVOID)network_data, /*event=*/WINDIVERT_EVENT_NETWORK_PACKET,
flags, priority, ipv4, outbound, loopback, impostor, /*match=*/TRUE,
timestamp);
if (advance != 0)
{
// Advance the NET_BUFFER to its original position. Note that we can
// do this here, since if (advance != 0) then there is only one
// NET_BUFFER in the NET_BUFFER_LIST, meaning that STEPS (1) and (3)
// will be empty.
NdisAdvanceNetBufferDataStart(buffer, advance, FALSE, NULL);
}
if (!ok)
{
goto windivert_network_classify_exit;
}
// STEP (3): Queue all remaining packets:
buffer_itr = NET_BUFFER_NEXT_NB(buffer_fst);
while (buffer_itr != NULL)
{
BOOL match = windivert_filter(buffer_itr, layer, (PVOID)network_data,
timestamp, /*event=*/WINDIVERT_EVENT_NETWORK_PACKET, ipv4,
outbound, loopback, impostor, filter);
ok = windivert_queue_work(context, (PVOID)buffer_itr,
NET_BUFFER_DATA_LENGTH(buffer_itr), buffers, layer,
(PVOID)network_data, /*event=*/WINDIVERT_EVENT_NETWORK_PACKET,
flags, priority, ipv4, outbound, loopback, impostor, match,
timestamp);
if (!ok)
{
goto windivert_network_classify_exit;
}
buffer_itr = NET_BUFFER_NEXT_NB(buffer_itr);
}
windivert_network_classify_exit:
WdfObjectDereference(object);
if (!sniff_mode)
{
result->actionType = FWP_ACTION_BLOCK;
result->flags |= FWPS_CLASSIFY_OUT_FLAG_ABSORB;
result->rights &= ~FWPS_RIGHT_ACTION_WRITE;
}
}
/*
* WinDivert classify flow established IPv4 function.
*/
static void windivert_flow_established_v4_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result)
{
WINDIVERT_DATA_FLOW flow_data;
BOOL outbound, loopback;
UINT64 flow_id;
flow_data.ProcessId = (UINT32)meta_vals->processId;
windivert_get_ipv4_addr(fixed_vals,
FWPS_FIELD_ALE_FLOW_ESTABLISHED_V4_IP_LOCAL_ADDRESS,
flow_data.LocalAddr);
windivert_get_ipv4_addr(fixed_vals,
FWPS_FIELD_ALE_FLOW_ESTABLISHED_V4_IP_REMOTE_ADDRESS,
flow_data.RemoteAddr);
flow_data.LocalPort = windivert_get_val16(fixed_vals,
FWPS_FIELD_ALE_FLOW_ESTABLISHED_V4_IP_LOCAL_PORT);
flow_data.RemotePort = windivert_get_val16(fixed_vals,
FWPS_FIELD_ALE_FLOW_ESTABLISHED_V4_IP_REMOTE_PORT);
flow_data.Protocol = windivert_get_val8(fixed_vals,
FWPS_FIELD_ALE_FLOW_ESTABLISHED_V4_IP_PROTOCOL);
outbound = (windivert_get_val32(fixed_vals,
FWPS_FIELD_ALE_FLOW_ESTABLISHED_V4_DIRECTION) ==
FWP_DIRECTION_OUTBOUND);
loopback = ((windivert_get_val32(fixed_vals,
FWPS_FIELD_ALE_FLOW_ESTABLISHED_V4_FLAGS) &
FWP_CONDITION_FLAG_IS_LOOPBACK) != 0);
flow_id = meta_vals->flowHandle;
windivert_flow_established_classify((context_t)filter->context,
flow_id, &flow_data, /*ipv4=*/TRUE, outbound, loopback, result);
}
/*
* WinDivert classify flow established IPv6 function.
*/
static void windivert_flow_established_v6_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result)
{
WINDIVERT_DATA_FLOW flow_data;
BOOL outbound, loopback;
UINT64 flow_id;
flow_data.ProcessId = (UINT32)meta_vals->processId;
windivert_get_ipv6_addr(fixed_vals,
FWPS_FIELD_ALE_FLOW_ESTABLISHED_V6_IP_LOCAL_ADDRESS,
flow_data.LocalAddr);
windivert_get_ipv6_addr(fixed_vals,
FWPS_FIELD_ALE_FLOW_ESTABLISHED_V6_IP_REMOTE_ADDRESS,
flow_data.RemoteAddr);
flow_data.LocalPort = windivert_get_val16(fixed_vals,
FWPS_FIELD_ALE_FLOW_ESTABLISHED_V6_IP_LOCAL_PORT);
flow_data.RemotePort = windivert_get_val16(fixed_vals,
FWPS_FIELD_ALE_FLOW_ESTABLISHED_V6_IP_REMOTE_PORT);
flow_data.Protocol = windivert_get_val8(fixed_vals,
FWPS_FIELD_ALE_FLOW_ESTABLISHED_V6_IP_PROTOCOL);
outbound = (windivert_get_val32(fixed_vals,
FWPS_FIELD_ALE_FLOW_ESTABLISHED_V6_DIRECTION) ==
FWP_DIRECTION_OUTBOUND);
loopback = ((windivert_get_val32(fixed_vals,
FWPS_FIELD_ALE_FLOW_ESTABLISHED_V6_FLAGS) &
FWP_CONDITION_FLAG_IS_LOOPBACK) != 0);
flow_id = meta_vals->flowHandle;
windivert_flow_established_classify((context_t)filter->context,
flow_id, &flow_data, /*ipv4=*/FALSE, outbound, loopback, result);
}
/*
* WinDivert flow established classify function.
*/
static void windivert_flow_established_classify(context_t context,
IN UINT64 flow_id, IN PWINDIVERT_DATA_FLOW flow_data, IN BOOL ipv4,
IN BOOL outbound, IN BOOL loopback, OUT FWPS_CLASSIFY_OUT0 *result)
{
KLOCK_QUEUE_HANDLE lock_handle;
UINT64 flags, filter_flags;
UINT32 callout_id;
UINT16 layer_id;
BOOL match, ok;
WDFOBJECT object;
const WINDIVERT_FILTER *filter;
LONGLONG timestamp;
flow_t flow;
NTSTATUS status;
// Basic checks:
if (!(result->rights & FWPS_RIGHT_ACTION_WRITE))
{
return;
}
// Get the timestamp.
timestamp = KeQueryPerformanceCounter(NULL).QuadPart;
result->actionType = FWP_ACTION_CONTINUE;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_OPEN ||
context->shutdown_recv)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
return;
}
filter = context->filter;
flags = context->flags;
filter_flags = context->filter_flags;
callout_id = (ipv4? context->flow_v4_callout_id:
context->flow_v6_callout_id);
object = (WDFOBJECT)context->object;
// Reference only released once the flow has been deleted. This is to
// prevent the callout being unregistered while flow deletions are still
// pending, causing the operation to fail with STATUS_DEVICE_BUSY.
WdfObjectReference(object);
KeReleaseInStackQueuedSpinLock(&lock_handle);
match = windivert_filter(/*buffer=*/NULL, /*layer=*/WINDIVERT_LAYER_FLOW,
(PVOID)flow_data, timestamp,
/*event=*/WINDIVERT_EVENT_FLOW_ESTABLISHED, ipv4, outbound, loopback,
/*impostor=*/FALSE, filter);
if (match)
{
ok = windivert_queue_work(context, /*packet=*/NULL, /*packet_len=*/0,
/*buffers=*/NULL, /*layer=*/WINDIVERT_LAYER_FLOW, (PVOID)flow_data,
/*event=*/WINDIVERT_EVENT_FLOW_ESTABLISHED, flags, /*priority=*/0,
ipv4, outbound, loopback, /*impostor=*/FALSE, match, timestamp);
if (!ok)
{
WdfObjectDereference(object);
return;
}
}
// Associate a context with the flow. This is so we can detect the
// FLOW_DELETED event.
if ((filter_flags & WINDIVERT_FILTER_FLAG_EVENT_FLOW_DELETED) == 0)
{
// We don't care about FLOW_DELETED.
WdfObjectDereference(object);
return;
}
flow = windivert_malloc(sizeof(struct flow_s), FALSE);
if (flow == NULL)
{
WdfObjectDereference(object);
return;
}
layer_id = (ipv4? FWPS_LAYER_ALE_FLOW_ESTABLISHED_V4:
FWPS_LAYER_ALE_FLOW_ESTABLISHED_V6);
flow->context = context;
flow->flow_id = flow_id;
flow->callout_id = callout_id;
flow->layer_id = layer_id;
flow->inserted = FALSE;
flow->deleted = FALSE;
flow->outbound = outbound;
flow->loopback = loopback;
flow->ipv6 = !ipv4;
RtlCopyMemory(&flow->data, flow_data, sizeof(flow->data));
status = FwpsFlowAssociateContext0(flow_id, layer_id, callout_id,
(UINT64)flow);
if (!NT_SUCCESS(status))
{
windivert_free(flow);
WdfObjectDereference(object);
return;
}
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_OPEN ||
context->shutdown_recv)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
windivert_free(flow);
WdfObjectDereference(object);
return;
}
if (!flow->deleted)
{
InsertTailList(&context->flow_set, &flow->entry);
flow->inserted = TRUE;
}
else
{
// Flow was deleted before insertion; we are responsible for cleanup.
KeReleaseInStackQueuedSpinLock(&lock_handle);
windivert_free(flow);
WdfObjectDereference(object);
return;
}
KeReleaseInStackQueuedSpinLock(&lock_handle);
}
/*
* WinDivert flow delete notify function.
*/
static void windivert_flow_delete_notify(UINT16 layer_id, UINT32 callout_id,
UINT64 flow_context)
{
KLOCK_QUEUE_HANDLE lock_handle;
UINT64 flags;
BOOL match, cleanup;
WDFOBJECT object;
context_t context;
const WINDIVERT_FILTER *filter;
LONGLONG timestamp;
flow_t flow;
flow = (flow_t)flow_context;
if (flow == NULL)
{
return;
}
timestamp = KeQueryPerformanceCounter(NULL).QuadPart;
context = flow->context;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
object = (WDFOBJECT)context->object; // referenced in flow_established.
if (flow->inserted && !flow->deleted)
{
RemoveEntryList(&flow->entry);
}
flow->deleted = TRUE;
cleanup = flow->inserted;
if (context->state != WINDIVERT_CONTEXT_STATE_OPEN ||
context->shutdown_recv)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
goto windivert_flow_delete_notify_exit;
}
filter = context->filter;
flags = context->flags;
KeReleaseInStackQueuedSpinLock(&lock_handle);
match = windivert_filter(/*buffer=*/NULL, /*layer=*/WINDIVERT_LAYER_FLOW,
(PVOID)&flow->data, timestamp, /*event=*/WINDIVERT_EVENT_FLOW_DELETED,
!flow->ipv6, flow->outbound, flow->loopback, /*impostor=*/FALSE,
filter);
if (match)
{
(VOID)windivert_queue_work(context, /*packet=*/NULL, /*packet_len=*/0,
/*buffers=*/NULL, /*layer=*/WINDIVERT_LAYER_FLOW,
(PVOID)&flow->data, /*event=*/WINDIVERT_EVENT_FLOW_DELETED, flags,
/*priority=*/0, !flow->ipv6, flow->outbound, flow->loopback,
/*impostor=*/FALSE, match, timestamp);
}
windivert_flow_delete_notify_exit:
if (cleanup)
{
windivert_free(flow);
WdfObjectDereference(object);
}
}
/*
* WinDivert classify resource assignment IPv4 function.
*/
static void windivert_resource_assignment_v4_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result)
{
WINDIVERT_DATA_SOCKET socket_data;
BOOL loopback;
socket_data.ProcessId = (UINT32)meta_vals->processId;
windivert_get_ipv4_addr(fixed_vals,
FWPS_FIELD_ALE_RESOURCE_ASSIGNMENT_V4_IP_LOCAL_ADDRESS,
socket_data.LocalAddr);
RtlZeroMemory(&socket_data.RemoteAddr, sizeof(socket_data.RemoteAddr));
socket_data.LocalPort = windivert_get_val16(fixed_vals,
FWPS_FIELD_ALE_RESOURCE_ASSIGNMENT_V4_IP_LOCAL_PORT);
socket_data.RemotePort = 0;
socket_data.Protocol = windivert_get_val8(fixed_vals,
FWPS_FIELD_ALE_RESOURCE_ASSIGNMENT_V4_IP_PROTOCOL);
loopback = ((windivert_get_val32(fixed_vals,
FWPS_FIELD_ALE_RESOURCE_ASSIGNMENT_V4_FLAGS) &
FWP_CONDITION_FLAG_IS_LOOPBACK) != 0);
windivert_socket_classify((context_t)filter->context,
&socket_data, /*event=*/WINDIVERT_EVENT_SOCKET_BIND, /*ipv4=*/TRUE,
/*outbound=*/FALSE, loopback, result);
}
/*
* WinDivert classify resource assignment IPv6 function.
*/
static void windivert_resource_assignment_v6_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result)
{
WINDIVERT_DATA_SOCKET socket_data;
BOOL loopback;
socket_data.ProcessId = (UINT32)meta_vals->processId;
windivert_get_ipv6_addr(fixed_vals,
FWPS_FIELD_ALE_RESOURCE_ASSIGNMENT_V6_IP_LOCAL_ADDRESS,
socket_data.LocalAddr);
RtlZeroMemory(&socket_data.RemoteAddr, sizeof(socket_data.RemoteAddr));
socket_data.LocalPort = windivert_get_val16(fixed_vals,
FWPS_FIELD_ALE_RESOURCE_ASSIGNMENT_V6_IP_LOCAL_PORT);
socket_data.RemotePort = 0;
socket_data.Protocol = windivert_get_val8(fixed_vals,
FWPS_FIELD_ALE_RESOURCE_ASSIGNMENT_V6_IP_PROTOCOL);
loopback = ((windivert_get_val32(fixed_vals,
FWPS_FIELD_ALE_RESOURCE_ASSIGNMENT_V6_FLAGS) &
FWP_CONDITION_FLAG_IS_LOOPBACK) != 0);
windivert_socket_classify((context_t)filter->context,
&socket_data, /*event=*/WINDIVERT_EVENT_SOCKET_BIND, /*ipv4=*/FALSE,
/*outbound=*/FALSE, loopback, result);
}
/*
* WinDivert classify auth connect IPv4 function.
*/
static void windivert_auth_connect_v4_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result)
{
WINDIVERT_DATA_SOCKET socket_data;
BOOL loopback;
socket_data.ProcessId = (UINT32)meta_vals->processId;
windivert_get_ipv4_addr(fixed_vals,
FWPS_FIELD_ALE_AUTH_CONNECT_V4_IP_LOCAL_ADDRESS,
socket_data.LocalAddr);
windivert_get_ipv4_addr(fixed_vals,
FWPS_FIELD_ALE_AUTH_CONNECT_V4_IP_REMOTE_ADDRESS,
socket_data.RemoteAddr);
socket_data.LocalPort = windivert_get_val16(fixed_vals,
FWPS_FIELD_ALE_AUTH_CONNECT_V4_IP_LOCAL_PORT);
socket_data.RemotePort = windivert_get_val16(fixed_vals,
FWPS_FIELD_ALE_AUTH_CONNECT_V4_IP_REMOTE_PORT);
socket_data.Protocol = windivert_get_val8(fixed_vals,
FWPS_FIELD_ALE_AUTH_CONNECT_V4_IP_PROTOCOL);
loopback = ((windivert_get_val32(fixed_vals,
FWPS_FIELD_ALE_AUTH_CONNECT_V4_FLAGS) &
FWP_CONDITION_FLAG_IS_LOOPBACK) != 0);
windivert_socket_classify((context_t)filter->context,
&socket_data, /*event=*/WINDIVERT_EVENT_SOCKET_CONNECT, /*ipv4=*/TRUE,
/*outbound=*/TRUE, loopback, result);
}
/*
* WinDivert classify auth connect IPv6 function.
*/
static void windivert_auth_connect_v6_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result)
{
WINDIVERT_DATA_SOCKET socket_data;
BOOL loopback;
socket_data.ProcessId = (UINT32)meta_vals->processId;
windivert_get_ipv6_addr(fixed_vals,
FWPS_FIELD_ALE_AUTH_CONNECT_V6_IP_LOCAL_ADDRESS,
socket_data.LocalAddr);
windivert_get_ipv6_addr(fixed_vals,
FWPS_FIELD_ALE_AUTH_CONNECT_V6_IP_REMOTE_ADDRESS,
socket_data.RemoteAddr);
socket_data.LocalPort = windivert_get_val16(fixed_vals,
FWPS_FIELD_ALE_AUTH_CONNECT_V6_IP_LOCAL_PORT);
socket_data.RemotePort = windivert_get_val16(fixed_vals,
FWPS_FIELD_ALE_AUTH_CONNECT_V6_IP_REMOTE_PORT);
socket_data.Protocol = windivert_get_val8(fixed_vals,
FWPS_FIELD_ALE_AUTH_CONNECT_V6_IP_PROTOCOL);
loopback = ((windivert_get_val32(fixed_vals,
FWPS_FIELD_ALE_AUTH_CONNECT_V6_FLAGS) &
FWP_CONDITION_FLAG_IS_LOOPBACK) != 0);
windivert_socket_classify((context_t)filter->context,
&socket_data, /*event=*/WINDIVERT_EVENT_SOCKET_CONNECT, /*ipv4=*/FALSE,
/*outbound=*/TRUE, loopback, result);
}
/*
* WinDivert classify auth listen IPv4 function.
*/
static void windivert_auth_listen_v4_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result)
{
WINDIVERT_DATA_SOCKET socket_data;
BOOL loopback;
socket_data.ProcessId = (UINT32)meta_vals->processId;
windivert_get_ipv4_addr(fixed_vals,
FWPS_FIELD_ALE_AUTH_LISTEN_V4_IP_LOCAL_ADDRESS,
socket_data.LocalAddr);
RtlZeroMemory(&socket_data.RemoteAddr, sizeof(socket_data.RemoteAddr));
socket_data.LocalPort = windivert_get_val16(fixed_vals,
FWPS_FIELD_ALE_AUTH_LISTEN_V4_IP_LOCAL_PORT);
socket_data.RemotePort = 0;
socket_data.Protocol = IPPROTO_TCP;
loopback = ((windivert_get_val32(fixed_vals,
FWPS_FIELD_ALE_AUTH_LISTEN_V4_FLAGS) &
FWP_CONDITION_FLAG_IS_LOOPBACK) != 0);
windivert_socket_classify((context_t)filter->context,
&socket_data, /*event=*/WINDIVERT_EVENT_SOCKET_LISTEN, /*ipv4=*/TRUE,
/*outbound=*/FALSE, loopback, result);
}
/*
* WinDivert classify auth listen IPv6 function.
*/
static void windivert_auth_listen_v6_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result)
{
WINDIVERT_DATA_SOCKET socket_data;
BOOL loopback;
socket_data.ProcessId = (UINT32)meta_vals->processId;
windivert_get_ipv6_addr(fixed_vals,
FWPS_FIELD_ALE_AUTH_LISTEN_V6_IP_LOCAL_ADDRESS,
socket_data.LocalAddr);
RtlZeroMemory(&socket_data.RemoteAddr, sizeof(socket_data.RemoteAddr));
socket_data.LocalPort = windivert_get_val16(fixed_vals,
FWPS_FIELD_ALE_AUTH_LISTEN_V6_IP_LOCAL_PORT);
socket_data.RemotePort = 0;
socket_data.Protocol = IPPROTO_TCP;
loopback = ((windivert_get_val32(fixed_vals,
FWPS_FIELD_ALE_AUTH_LISTEN_V6_FLAGS) &
FWP_CONDITION_FLAG_IS_LOOPBACK) != 0);
windivert_socket_classify((context_t)filter->context,
&socket_data, /*event=*/WINDIVERT_EVENT_SOCKET_LISTEN, /*ipv4=*/FALSE,
/*outbound=*/FALSE, loopback, result);
}
/*
* WinDivert classify auth recv accept IPv4 function.
*/
static void windivert_auth_recv_accept_v4_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result)
{
WINDIVERT_DATA_SOCKET socket_data;
BOOL loopback;
socket_data.ProcessId = (UINT32)meta_vals->processId;
windivert_get_ipv4_addr(fixed_vals,
FWPS_FIELD_ALE_AUTH_RECV_ACCEPT_V4_IP_LOCAL_ADDRESS,
socket_data.LocalAddr);
windivert_get_ipv4_addr(fixed_vals,
FWPS_FIELD_ALE_AUTH_RECV_ACCEPT_V4_IP_REMOTE_ADDRESS,
socket_data.RemoteAddr);
socket_data.LocalPort = windivert_get_val16(fixed_vals,
FWPS_FIELD_ALE_AUTH_RECV_ACCEPT_V4_IP_LOCAL_PORT);
socket_data.RemotePort = windivert_get_val16(fixed_vals,
FWPS_FIELD_ALE_AUTH_RECV_ACCEPT_V4_IP_REMOTE_PORT);
socket_data.Protocol = windivert_get_val8(fixed_vals,
FWPS_FIELD_ALE_AUTH_RECV_ACCEPT_V4_IP_PROTOCOL);
loopback = ((windivert_get_val32(fixed_vals,
FWPS_FIELD_ALE_AUTH_RECV_ACCEPT_V4_FLAGS) &
FWP_CONDITION_FLAG_IS_LOOPBACK) != 0);
windivert_socket_classify((context_t)filter->context,
&socket_data, /*event=*/WINDIVERT_EVENT_SOCKET_ACCEPT, /*ipv4=*/TRUE,
/*outbound=*/FALSE, loopback, result);
}
/*
* WinDivert classify auth recv accept IPv6 function.
*/
static void windivert_auth_recv_accept_v6_classify(
IN const FWPS_INCOMING_VALUES0 *fixed_vals,
IN const FWPS_INCOMING_METADATA_VALUES0 *meta_vals, IN OUT void *data,
const FWPS_FILTER0 *filter, IN UINT64 flow_context,
OUT FWPS_CLASSIFY_OUT0 *result)
{
WINDIVERT_DATA_SOCKET socket_data;
BOOL loopback;
socket_data.ProcessId = (UINT32)meta_vals->processId;
windivert_get_ipv6_addr(fixed_vals,
FWPS_FIELD_ALE_AUTH_RECV_ACCEPT_V6_IP_LOCAL_ADDRESS,
socket_data.LocalAddr);
windivert_get_ipv6_addr(fixed_vals,
FWPS_FIELD_ALE_AUTH_RECV_ACCEPT_V6_IP_REMOTE_ADDRESS,
socket_data.RemoteAddr);
socket_data.LocalPort = windivert_get_val16(fixed_vals,
FWPS_FIELD_ALE_AUTH_RECV_ACCEPT_V6_IP_LOCAL_PORT);
socket_data.RemotePort = windivert_get_val16(fixed_vals,
FWPS_FIELD_ALE_AUTH_RECV_ACCEPT_V6_IP_REMOTE_PORT);
socket_data.Protocol = windivert_get_val8(fixed_vals,
FWPS_FIELD_ALE_AUTH_RECV_ACCEPT_V6_IP_PROTOCOL);
loopback = ((windivert_get_val32(fixed_vals,
FWPS_FIELD_ALE_AUTH_RECV_ACCEPT_V6_FLAGS) &
FWP_CONDITION_FLAG_IS_LOOPBACK) != 0);
windivert_socket_classify((context_t)filter->context,
&socket_data, /*event=*/WINDIVERT_EVENT_SOCKET_ACCEPT, /*ipv4=*/FALSE,
/*outbound=*/FALSE, loopback, result);
}
/*
* WinDivert socket classify function.
*/
static void windivert_socket_classify(context_t context,
PWINDIVERT_DATA_SOCKET socket_data, WINDIVERT_EVENT event, BOOL ipv4,
BOOL outbound, BOOL loopback, FWPS_CLASSIFY_OUT0 *result)
{
KLOCK_QUEUE_HANDLE lock_handle;
UINT64 flags;
BOOL match, ok;
WDFOBJECT object;
const WINDIVERT_FILTER *filter;
LONGLONG timestamp;
NTSTATUS status;
// Basic checks:
if (!(result->rights & FWPS_RIGHT_ACTION_WRITE))
{
return;
}
// Get the timestamp.
timestamp = KeQueryPerformanceCounter(NULL).QuadPart;
result->actionType = FWP_ACTION_CONTINUE;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_OPEN ||
context->shutdown_recv)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
return;
}
filter = context->filter;
flags = context->flags;
object = (WDFOBJECT)context->object;
WdfObjectReference(object);
KeReleaseInStackQueuedSpinLock(&lock_handle);
match = windivert_filter(/*buffer=*/NULL, /*layer=*/WINDIVERT_LAYER_SOCKET,
(PVOID)socket_data, timestamp, event, ipv4, outbound, loopback,
/*impostor=*/FALSE, filter);
if (match)
{
ok = windivert_queue_work(context, /*packet=*/NULL, /*packet_len=*/0,
/*buffers=*/NULL, /*layer=*/WINDIVERT_LAYER_SOCKET,
(PVOID)socket_data, event, flags, /*priority=*/0, ipv4, outbound,
loopback, /*impostor=*/FALSE, match, timestamp);
if (!ok)
{
WdfObjectDereference(object);
return;
}
}
WdfObjectDereference(object);
if ((flags & WINDIVERT_FLAG_SNIFF) == 0)
{
result->actionType = FWP_ACTION_BLOCK;
result->flags |= FWPS_CLASSIFY_OUT_FLAG_ABSORB;
result->rights &= ~FWPS_RIGHT_ACTION_WRITE;
}
}
/*
* WinDivert work item routine for out-of-band filtering.
*/
VOID windivert_worker(IN WDFWORKITEM item)
{
KLOCK_QUEUE_HANDLE lock_handle;
WDFFILEOBJECT object = (WDFFILEOBJECT)WdfWorkItemGetParentObject(item);
context_t context = windivert_context_get(object);
PLIST_ENTRY entry;
packet_t work;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
while (context->state == WINDIVERT_CONTEXT_STATE_OPEN &&
!IsListEmpty(&context->work_queue))
{
entry = RemoveHeadList(&context->work_queue);
context->work_queue_length--;
KeReleaseInStackQueuedSpinLock(&lock_handle);
work = CONTAINING_RECORD(entry, struct packet_s, entry);
if (work->match)
{
windivert_queue_packet(context, work);
}
else
{
windivert_reinject_packet(work);
}
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
}
KeReleaseInStackQueuedSpinLock(&lock_handle);
windivert_read_service(context);
}
/*
* Queue work.
*/
static BOOL windivert_queue_work(context_t context, PVOID packet,
ULONG packet_len, PNET_BUFFER_LIST buffers, WINDIVERT_LAYER layer,
PVOID layer_data, WINDIVERT_EVENT event, UINT64 flags, UINT32 priority,
BOOL ipv4, BOOL outbound, BOOL loopback, BOOL impostor, BOOL match,
LONGLONG timestamp)
{
KLOCK_QUEUE_HANDLE lock_handle;
PNET_BUFFER buffer;
packet_t work;
PVOID packet_data;
UINT8 *data;
PLIST_ENTRY old_entry;
NDIS_TCP_IP_CHECKSUM_NET_BUFFER_LIST_INFO checksums;
PWINDIVERT_DATA_NETWORK network_data;
PWINDIVERT_DATA_FLOW flow_data;
PWINDIVERT_DATA_SOCKET socket_data;
PWINDIVERT_DATA_REFLECT reflect_data;
BOOL pseudo_ip_checksum, pseudo_tcp_checksum, pseudo_udp_checksum;
if (!match && (flags & WINDIVERT_FLAG_SNIFF) != 0)
{
return TRUE;
}
if (match && (flags & WINDIVERT_FLAG_DROP) != 0)
{
return TRUE;
}
// Copy the packet & layer data.
switch (layer)
{
case WINDIVERT_LAYER_NETWORK:
case WINDIVERT_LAYER_NETWORK_FORWARD:
buffer = (PNET_BUFFER)packet;
network_data = (PWINDIVERT_DATA_NETWORK)layer_data;
if (packet_len > UINT16_MAX)
{
// Cannot handle oversized packet
return TRUE;
}
work = (packet_t)windivert_malloc(
WINDIVERT_PACKET_SIZE(WINDIVERT_DATA_NETWORK, packet_len),
FALSE);
if (work == NULL)
{
return TRUE;
}
work->packet_len = (UINT32)packet_len;
data = WINDIVERT_LAYER_DATA_PTR(work);
RtlCopyMemory(data, network_data, sizeof(WINDIVERT_DATA_NETWORK));
data = WINDIVERT_PACKET_DATA_PTR(WINDIVERT_DATA_NETWORK, work);
packet_data = NdisGetDataBuffer(buffer, packet_len, NULL, 1, 0);
if (packet_data == NULL)
{
NdisGetDataBuffer(buffer, packet_len, data, 1, 0);
}
else
{
RtlCopyMemory(data, packet_data, packet_len);
}
checksums.Value = NET_BUFFER_LIST_INFO(buffers,
TcpIpChecksumNetBufferListInfo);
if (outbound)
{
pseudo_ip_checksum = (checksums.Transmit.IpHeaderChecksum != 0);
pseudo_tcp_checksum = (checksums.Transmit.TcpChecksum != 0);
pseudo_udp_checksum = (checksums.Transmit.UdpChecksum != 0);
}
else
{
pseudo_ip_checksum =
(checksums.Receive.IpChecksumSucceeded != 0);
pseudo_tcp_checksum =
(checksums.Receive.TcpChecksumSucceeded != 0);
pseudo_udp_checksum =
(checksums.Receive.UdpChecksumSucceeded != 0);
}
break;
case WINDIVERT_LAYER_FLOW:
flow_data = (PWINDIVERT_DATA_FLOW)layer_data;
work = (packet_t)windivert_malloc(
WINDIVERT_PACKET_SIZE(WINDIVERT_DATA_FLOW, 0), FALSE);
if (work == NULL)
{
return TRUE;
}
work->packet_len = 0;
data = WINDIVERT_LAYER_DATA_PTR(work);
RtlCopyMemory(data, flow_data, sizeof(WINDIVERT_DATA_FLOW));
pseudo_ip_checksum = pseudo_tcp_checksum = pseudo_udp_checksum =
FALSE;
break;
case WINDIVERT_LAYER_SOCKET:
socket_data = (PWINDIVERT_DATA_SOCKET)layer_data;
work = (packet_t)windivert_malloc(
WINDIVERT_PACKET_SIZE(WINDIVERT_DATA_SOCKET, 0), FALSE);
if (work == NULL)
{
return TRUE;
}
work->packet_len = 0;
data = WINDIVERT_LAYER_DATA_PTR(work);
RtlCopyMemory(data, socket_data, sizeof(WINDIVERT_DATA_SOCKET));
pseudo_ip_checksum = pseudo_tcp_checksum = pseudo_udp_checksum =
FALSE;
break;
case WINDIVERT_LAYER_REFLECT:
reflect_data = (PWINDIVERT_DATA_REFLECT)layer_data;
work = (packet_t)windivert_malloc(
WINDIVERT_PACKET_SIZE(WINDIVERT_DATA_REFLECT, packet_len),
FALSE);
if (work == NULL)
{
return TRUE;
}
work->packet_len = packet_len;
data = WINDIVERT_LAYER_DATA_PTR(work);
RtlCopyMemory(data, reflect_data, sizeof(WINDIVERT_DATA_REFLECT));
data = WINDIVERT_PACKET_DATA_PTR(WINDIVERT_DATA_REFLECT, work);
RtlCopyMemory(data, packet, packet_len);
pseudo_ip_checksum = TRUE;
pseudo_tcp_checksum = pseudo_udp_checksum = FALSE;
break;
default:
return TRUE;
}
work->layer = layer;
work->event = event;
work->outbound = (outbound? 1: 0);
work->loopback = (loopback? 1: 0);
work->impostor = (impostor? 1: 0);
work->ipv6 = (!ipv4? 1: 0);
work->pseudo_ip_checksum = (pseudo_ip_checksum? 1: 0);
work->pseudo_tcp_checksum = (pseudo_tcp_checksum? 1: 0);
work->pseudo_udp_checksum = (pseudo_udp_checksum? 1: 0);
work->match = match;
work->priority = priority;
work->timestamp = timestamp;
old_entry = NULL;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_OPEN)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
windivert_free_packet(work);
return FALSE;
}
if (context->shutdown_recv && context->shutdown_recv_enabled)
{
if ((flags & WINDIVERT_FLAG_SNIFF) != 0)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
windivert_free_packet(work);
return FALSE;
}
work->match = FALSE;
}
context->work_queue_length++;
if (context->work_queue_length > WINDIVERT_WORK_QUEUE_LEN_MAX)
{
// The work queue is full; as an emergency we drop packets.
old_entry = RemoveHeadList(&context->work_queue);
context->work_queue_length--;
}
InsertTailList(&context->work_queue, &work->entry);
WdfWorkItemEnqueue(context->worker);
KeReleaseInStackQueuedSpinLock(&lock_handle);
if (old_entry != NULL)
{
work = CONTAINING_RECORD(old_entry, struct packet_s, entry);
windivert_free_packet(work);
}
return TRUE;
}
/*
* Queue a packet.
*/
static void windivert_queue_packet(context_t context, packet_t packet)
{
KLOCK_QUEUE_HANDLE lock_handle;
PLIST_ENTRY entry, old_entry;
packet_t old_packet;
LONGLONG timestamp;
BOOL timeout;
timestamp = KeQueryPerformanceCounter(NULL).QuadPart;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
while (TRUE)
{
if (context->state != WINDIVERT_CONTEXT_STATE_OPEN)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
windivert_reinject_packet(packet);
return;
}
if (packet->packet_len > context->packet_queue_maxsize)
{
// (Corner case) the packet is larger than the max queue size:
KeReleaseInStackQueuedSpinLock(&lock_handle);
windivert_free_packet(packet);
return;
}
timeout = WINDIVERT_TIMEOUT(context, packet->timestamp, timestamp);
if (timeout)
{
// (Corner case) the packet has already expired:
KeReleaseInStackQueuedSpinLock(&lock_handle);
windivert_free_packet(packet);
return;
}
if (context->packet_queue_size + packet->packet_len >
context->packet_queue_maxsize ||
context->packet_queue_length + 1 > context->packet_queue_maxlength)
{
// The queue is full; drop a packet & try again:
old_entry = RemoveHeadList(&context->packet_queue);
old_packet = CONTAINING_RECORD(old_entry, struct packet_s, entry);
context->packet_queue_length--;
context->packet_queue_size -= old_packet->packet_len;
KeReleaseInStackQueuedSpinLock(&lock_handle);
DEBUG("DROP: packet queue is full, dropping packet");
windivert_free_packet(old_packet);
timestamp = KeQueryPerformanceCounter(NULL).QuadPart;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
continue;
}
else
{
// Queue the packet:
InsertTailList(&context->packet_queue, &packet->entry);
context->packet_queue_length++;
context->packet_queue_size += packet->packet_len;
break;
}
}
KeReleaseInStackQueuedSpinLock(&lock_handle);
DEBUG("PACKET: queued packet (packet=%p)", packet);
return;
}
/*
* Re-inject a packet.
*/
static void windivert_reinject_packet(packet_t packet)
{
UINT8 *packet_data;
UINT32 packet_len;
UINT64 checksums;
PWINDIVERT_DATA_NETWORK network_data;
PMDL mdl;
PNET_BUFFER_LIST buffers;
HANDLE handle;
UINT32 priority;
NTSTATUS status;
if (packet->layer != WINDIVERT_LAYER_NETWORK &&
packet->layer != WINDIVERT_LAYER_NETWORK_FORWARD)
{
windivert_free_packet(packet);
return;
}
network_data = (PWINDIVERT_DATA_NETWORK)WINDIVERT_LAYER_DATA_PTR(packet);
packet_data = WINDIVERT_PACKET_DATA_PTR(WINDIVERT_DATA_NETWORK, packet);
packet_len = packet->packet_len;
// Fix checksums:
if (packet->pseudo_ip_checksum != 0 || packet->pseudo_tcp_checksum != 0 ||
packet->pseudo_udp_checksum != 0)
{
checksums =
(packet->pseudo_ip_checksum != 0? 0:
WINDIVERT_HELPER_NO_IP_CHECKSUM) |
(packet->pseudo_tcp_checksum != 0? 0:
WINDIVERT_HELPER_NO_TCP_CHECKSUM) |
(packet->pseudo_udp_checksum != 0? 0:
WINDIVERT_HELPER_NO_UDP_CHECKSUM) |
WINDIVERT_HELPER_NO_ICMP_CHECKSUM |
WINDIVERT_HELPER_NO_ICMPV6_CHECKSUM;
WinDivertHelperCalcChecksums(packet_data, packet_len, NULL, checksums);
}
// Decrement TTL for impostor packets:
if (packet->impostor != 0 && !windivert_decrement_ttl(packet_data,
packet->ipv6 == 0))
{
status = STATUS_HOPLIMIT_EXCEEDED;
DEBUG_ERROR("failed to reinject ttl-exceeded impostor packet", status);
windivert_free_packet(packet);
return;
}
// Reinject packet:
mdl = IoAllocateMdl(packet_data, packet_len, FALSE, FALSE, NULL);
if (mdl == NULL)
{
status = STATUS_INSUFFICIENT_RESOURCES;
DEBUG_ERROR("failed to allocate MDL for reinjected packet", status);
windivert_free_packet(packet);
return;
}
MmBuildMdlForNonPagedPool(mdl);
status = FwpsAllocateNetBufferAndNetBufferList0(nbl_pool_handle, 0, 0,
mdl, 0, packet_len, &buffers);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to create NET_BUFFER_LIST for reinjected packet",
status);
IoFreeMdl(mdl);
windivert_free_packet(packet);
return;
}
priority = packet->priority;
handle = (packet->ipv6? injectv6_handle: inject_handle);
if (packet->layer == WINDIVERT_LAYER_NETWORK_FORWARD)
{
status = FwpsInjectForwardAsync0(handle, (HANDLE)priority, 0,
(packet->ipv6? AF_INET6: AF_INET), UNSPECIFIED_COMPARTMENT_ID,
network_data->IfIdx, buffers, windivert_reinject_complete,
(HANDLE)packet);
}
else if (packet->outbound)
{
status = FwpsInjectNetworkSendAsync0(handle, (HANDLE)priority, 0,
UNSPECIFIED_COMPARTMENT_ID, buffers, windivert_reinject_complete,
(HANDLE)packet);
}
else
{
status = FwpsInjectNetworkReceiveAsync0(handle, (HANDLE)priority, 0,
UNSPECIFIED_COMPARTMENT_ID, network_data->IfIdx,
network_data->SubIfIdx, buffers, windivert_reinject_complete,
(HANDLE)packet);
}
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to reinject (packet=%p)", status, packet);
FwpsFreeNetBufferList0(buffers);
IoFreeMdl(mdl);
windivert_free_packet(packet);
}
}
/*
* Free a packet.
*/
static void windivert_free_packet(packet_t packet)
{
windivert_free(packet);
}
/*
* Decrement the TTL of a packet.
*/
static BOOL windivert_decrement_ttl(PVOID data, BOOL ipv4)
{
PWINDIVERT_IPHDR ip_header;
PWINDIVERT_IPV6HDR ipv6_header;
if (ipv4)
{
ip_header = (PWINDIVERT_IPHDR)data;
if (ip_header->TTL <= 1)
{
return FALSE;
}
ip_header->TTL--;
// Incremental checksum update:
if (ip_header->Checksum >= 0xFFFE)
{
ip_header->Checksum -= 0xFFFE;
}
else
{
ip_header->Checksum += 1;
}
}
else
{
ipv6_header = (PWINDIVERT_IPV6HDR)data;
if (ipv6_header->HopLimit <= 1)
{
return FALSE;
}
ipv6_header->HopLimit--;
}
return TRUE;
}
/*
* Big number comparison.
*/
static int windivert_big_num_compare(const UINT32 *a, const UINT32 *b, BOOL big)
{
if (big)
{
if (a[3] < b[3])
{
return -1;
}
if (a[3] > b[3])
{
return 1;
}
if (a[2] < b[2])
{
return -1;
}
if (a[2] > b[2])
{
return 1;
}
if (a[1] < b[1])
{
return -1;
}
if (a[1] > b[1])
{
return 1;
}
}
if (a[0] < b[0])
{
return -1;
}
if (a[0] > b[0])
{
return 1;
}
return 0;
}
/*
* Get packet/payload data.
*/
static BOOL windivert_get_data(PNET_BUFFER buffer, UINT offset, INT idx,
UINT size, PVOID data)
{
PVOID ptr;
UINT length = NET_BUFFER_DATA_LENGTH(buffer);
if (idx < 0)
{
idx += (INT)length;
}
else
{
idx += (INT)offset;
}
if (idx < (INT)offset || idx > (INT)(length - size))
{
return FALSE; // OOB
}
if (idx > 0)
{
NdisAdvanceNetBufferDataStart(buffer, idx, FALSE, NULL);
}
ptr = NdisGetDataBuffer(buffer, size, data, 1, 0);
if (ptr != NULL && ptr != data)
{
RtlCopyMemory(data, ptr, size); // Non-contiguous case
}
if (idx > 0)
{
(VOID)NdisRetreatNetBufferDataStart(buffer, idx, 0, NULL);
}
return TRUE;
}
/*
* Parse packet headers.
*/
static BOOL windivert_parse_headers(PNET_BUFFER buffer, BOOL ipv4,
PWINDIVERT_IPHDR *ip_header_ptr, PWINDIVERT_IPV6HDR *ipv6_header_ptr,
PWINDIVERT_ICMPHDR *icmp_header_ptr,
PWINDIVERT_ICMPV6HDR *icmpv6_header_ptr,
PWINDIVERT_TCPHDR *tcp_header_ptr, PWINDIVERT_UDPHDR *udp_header_ptr,
UINT8 *proto_ptr, UINT *header_len_ptr, UINT *payload_len_ptr)
{
UINT tot_len, ip_header_len;
PWINDIVERT_IPHDR ip_header = NULL;
PWINDIVERT_IPV6HDR ipv6_header = NULL;
PWINDIVERT_ICMPHDR icmp_header = NULL;
PWINDIVERT_ICMPV6HDR icmpv6_header = NULL;
PWINDIVERT_TCPHDR tcp_header = NULL;
PWINDIVERT_UDPHDR udp_header = NULL;
UINT16 ip, ttl;
UINT8 proto = 0;
UINT header_len = 0, payload_len = 0;
NTSTATUS status;
// Parse the headers:
if (buffer == NULL)
{
DEBUG("FILTER: REJECT (packet is NULL)");
return FALSE;
}
tot_len = NET_BUFFER_DATA_LENGTH(buffer);
if (tot_len < sizeof(WINDIVERT_IPHDR))
{
DEBUG("FILTER: REJECT (packet length too small)");
return FALSE;
}
// Get the IP header.
if (ipv4)
{
// IPv4:
if (tot_len < sizeof(WINDIVERT_IPHDR))
{
DEBUG("FILTER: REJECT (packet length too small)");
return FALSE;
}
ip_header = (PWINDIVERT_IPHDR)NdisGetDataBuffer(buffer,
sizeof(WINDIVERT_IPHDR), NULL, 1, 0);
if (ip_header == NULL)
{
DEBUG("FILTER: REJECT (failed to get IPv4 header)");
return FALSE;
}
ip_header_len = ip_header->HdrLength*sizeof(UINT32);
if (ip_header->Version != 4 ||
RtlUshortByteSwap(ip_header->Length) != tot_len ||
ip_header->HdrLength < 5 ||
ip_header_len > tot_len)
{
DEBUG("FILTER: REJECT (bad IPv4 packet)");
return FALSE;
}
proto = ip_header->Protocol;
NdisAdvanceNetBufferDataStart(buffer, ip_header_len, FALSE, NULL);
}
else
{
// IPv6:
if (tot_len < sizeof(WINDIVERT_IPV6HDR))
{
DEBUG("FILTER: REJECT (packet length too small)");
return FALSE;
}
ipv6_header = (PWINDIVERT_IPV6HDR)NdisGetDataBuffer(buffer,
sizeof(WINDIVERT_IPV6HDR), NULL, 1, 0);
if (ipv6_header == NULL)
{
DEBUG("FILTER: REJECT (failed to get IPv6 header)");
return FALSE;
}
ip_header_len = sizeof(WINDIVERT_IPV6HDR);
if (ipv6_header->Version != 6 ||
ip_header_len > tot_len ||
RtlUshortByteSwap(ipv6_header->Length) +
sizeof(WINDIVERT_IPV6HDR) != tot_len)
{
DEBUG("FILTER: REJECT (bad IPv6 packet)");
return FALSE;
}
proto = ipv6_header->NextHdr;
NdisAdvanceNetBufferDataStart(buffer, ip_header_len, FALSE, NULL);
// Skip extension headers:
while (TRUE)
{
UINT8 *ext_header;
UINT ext_header_len;
BOOL isexthdr = TRUE;
ext_header = (UINT8 *)NdisGetDataBuffer(buffer, 2, NULL, 1, 0);
if (ext_header == NULL)
{
break;
}
ext_header_len = (UINT)ext_header[1];
switch (proto)
{
case IPPROTO_FRAGMENT:
ext_header_len = 8;
break;
case IPPROTO_AH:
ext_header_len += 2;
ext_header_len *= 4;
break;
case IPPROTO_HOPOPTS:
case IPPROTO_DSTOPTS:
case IPPROTO_ROUTING:
ext_header_len++;
ext_header_len *= 8;
break;
default:
isexthdr = FALSE;
break;
}
if (!isexthdr)
{
break;
}
proto = ext_header[0];
ip_header_len += ext_header_len;
NdisAdvanceNetBufferDataStart(buffer, ext_header_len, FALSE,
NULL);
}
}
switch (proto)
{
case IPPROTO_ICMP:
icmp_header = (PWINDIVERT_ICMPHDR)NdisGetDataBuffer(buffer,
sizeof(WINDIVERT_ICMPHDR), NULL, 1, 0);
header_len = ip_header_len + sizeof(WINDIVERT_ICMPHDR);
break;
case IPPROTO_ICMPV6:
icmpv6_header = (PWINDIVERT_ICMPV6HDR)NdisGetDataBuffer(buffer,
sizeof(WINDIVERT_ICMPV6HDR), NULL, 1, 0);
header_len = ip_header_len + sizeof(WINDIVERT_ICMPV6HDR);
break;
case IPPROTO_TCP:
tcp_header = (PWINDIVERT_TCPHDR)NdisGetDataBuffer(buffer,
sizeof(WINDIVERT_TCPHDR), NULL, 1, 0);
header_len = ip_header_len + tcp_header->HdrLength*sizeof(UINT32);
break;
case IPPROTO_UDP:
udp_header = (PWINDIVERT_UDPHDR)NdisGetDataBuffer(buffer,
sizeof(WINDIVERT_UDPHDR), NULL, 1, 0);
header_len = ip_header_len + sizeof(WINDIVERT_UDPHDR);
break;
default:
header_len = ip_header_len;
break;
}
status = NdisRetreatNetBufferDataStart(buffer, ip_header_len, 0, NULL);
if (!NT_SUCCESS(status))
{
// Should never occur.
DEBUG("FILTER: REJECT (failed to retreat buffer)");
return FALSE;
}
*ip_header_ptr = ip_header;
*ipv6_header_ptr = ipv6_header;
*icmp_header_ptr = icmp_header;
*icmpv6_header_ptr = icmpv6_header;
*tcp_header_ptr = tcp_header;
*udp_header_ptr = udp_header;
*proto_ptr = proto;
*header_len_ptr = header_len;
*payload_len_ptr = tot_len - header_len;
return TRUE;
}
/*
* Checks if the given network packet is of interest.
*/
static BOOL windivert_filter(PNET_BUFFER buffer, WINDIVERT_LAYER layer,
const VOID *layer_data, LONGLONG timestamp, WINDIVERT_EVENT event,
BOOL ipv4, BOOL outbound, BOOL loopback, BOOL impostor,
const WINDIVERT_FILTER *filter)
{
PWINDIVERT_IPHDR ip_header = NULL;
PWINDIVERT_IPV6HDR ipv6_header = NULL;
PWINDIVERT_ICMPHDR icmp_header = NULL;
PWINDIVERT_ICMPV6HDR icmpv6_header = NULL;
PWINDIVERT_TCPHDR tcp_header = NULL;
PWINDIVERT_UDPHDR udp_header = NULL;
UINT8 protocol = 0;
UINT header_len = 0, payload_len = 0;
UINT64 random64 = 0;
UINT16 ip, ttl;
PWINDIVERT_DATA_NETWORK network_data = NULL;
PWINDIVERT_DATA_FLOW flow_data = NULL;
PWINDIVERT_DATA_SOCKET socket_data = NULL;
PWINDIVERT_DATA_REFLECT reflect_data = NULL;
UINT8 data8;
UINT16 data16;
UINT32 data32;
NTSTATUS status;
switch (layer)
{
case WINDIVERT_LAYER_NETWORK:
case WINDIVERT_LAYER_NETWORK_FORWARD:
if (!windivert_parse_headers(buffer, ipv4, &ip_header, &ipv6_header,
&icmp_header, &icmpv6_header, &tcp_header, &udp_header,
&protocol, &header_len, &payload_len))
{
return FALSE;
}
network_data = (PWINDIVERT_DATA_NETWORK)layer_data;
break;
case WINDIVERT_LAYER_FLOW:
flow_data = (PWINDIVERT_DATA_FLOW)layer_data;
break;
case WINDIVERT_LAYER_SOCKET:
socket_data = (PWINDIVERT_DATA_SOCKET)layer_data;
break;
case WINDIVERT_LAYER_REFLECT:
reflect_data = (PWINDIVERT_DATA_REFLECT)layer_data;
break;
default:
DEBUG("FILTER: REJECT (invalid parameter)");
return FALSE;
}
// Execute the filter:
ip = 0;
ttl = WINDIVERT_FILTER_MAXLEN+1; // Additional safety
while (ttl-- != 0)
{
BOOL result = FALSE;
BOOL big = FALSE;
int cmp;
UINT32 field[4];
switch (filter[ip].field)
{
case WINDIVERT_FILTER_FIELD_ZERO:
case WINDIVERT_FILTER_FIELD_EVENT:
result = TRUE;
break;
case WINDIVERT_FILTER_FIELD_INBOUND:
case WINDIVERT_FILTER_FIELD_OUTBOUND:
result = (layer != WINDIVERT_LAYER_NETWORK_FORWARD &&
layer != WINDIVERT_LAYER_REFLECT);
break;
case WINDIVERT_FILTER_FIELD_LOOPBACK:
case WINDIVERT_FILTER_FIELD_IMPOSTOR:
case WINDIVERT_FILTER_FIELD_IP:
case WINDIVERT_FILTER_FIELD_IPV6:
case WINDIVERT_FILTER_FIELD_ICMP:
case WINDIVERT_FILTER_FIELD_ICMPV6:
case WINDIVERT_FILTER_FIELD_TCP:
case WINDIVERT_FILTER_FIELD_UDP:
result = (layer != WINDIVERT_LAYER_REFLECT);
break;
case WINDIVERT_FILTER_FIELD_RANDOM8:
case WINDIVERT_FILTER_FIELD_RANDOM16:
case WINDIVERT_FILTER_FIELD_RANDOM32:
result = (layer == WINDIVERT_LAYER_NETWORK ||
layer == WINDIVERT_LAYER_NETWORK_FORWARD);
if (result && random64 == 0)
{
random64 = WinDivertHashPacket((UINT64)timestamp,
ip_header, ipv6_header, icmp_header, icmpv6_header,
tcp_header, udp_header);
random64 |= 0xFF00000000000000ull; // Make non-zero.
}
break;
case WINDIVERT_FILTER_FIELD_IFIDX:
case WINDIVERT_FILTER_FIELD_SUBIFIDX:
case WINDIVERT_FILTER_FIELD_PACKET:
case WINDIVERT_FILTER_FIELD_PACKET16:
case WINDIVERT_FILTER_FIELD_PACKET32:
result = (layer == WINDIVERT_LAYER_NETWORK ||
layer == WINDIVERT_LAYER_NETWORK_FORWARD);
break;
case WINDIVERT_FILTER_FIELD_LOCALADDR:
case WINDIVERT_FILTER_FIELD_REMOTEADDR:
case WINDIVERT_FILTER_FIELD_LOCALPORT:
case WINDIVERT_FILTER_FIELD_REMOTEPORT:
case WINDIVERT_FILTER_FIELD_PROTOCOL:
result = (layer == WINDIVERT_LAYER_NETWORK ||
layer == WINDIVERT_LAYER_FLOW ||
layer == WINDIVERT_LAYER_SOCKET);
break;
case WINDIVERT_FILTER_FIELD_PROCESSID:
result = (layer == WINDIVERT_LAYER_FLOW ||
layer == WINDIVERT_LAYER_SOCKET ||
layer == WINDIVERT_LAYER_REFLECT);
break;
case WINDIVERT_FILTER_FIELD_LAYER:
result = (layer == WINDIVERT_LAYER_REFLECT);
break;
case WINDIVERT_FILTER_FIELD_IP_HDRLENGTH:
case WINDIVERT_FILTER_FIELD_IP_TOS:
case WINDIVERT_FILTER_FIELD_IP_LENGTH:
case WINDIVERT_FILTER_FIELD_IP_ID:
case WINDIVERT_FILTER_FIELD_IP_DF:
case WINDIVERT_FILTER_FIELD_IP_MF:
case WINDIVERT_FILTER_FIELD_IP_FRAGOFF:
case WINDIVERT_FILTER_FIELD_IP_TTL:
case WINDIVERT_FILTER_FIELD_IP_PROTOCOL:
case WINDIVERT_FILTER_FIELD_IP_CHECKSUM:
case WINDIVERT_FILTER_FIELD_IP_SRCADDR:
case WINDIVERT_FILTER_FIELD_IP_DSTADDR:
result = (layer == WINDIVERT_LAYER_NETWORK ||
layer == WINDIVERT_LAYER_NETWORK_FORWARD);
result = result && (ip_header != NULL);
break;
case WINDIVERT_FILTER_FIELD_IPV6_TRAFFICCLASS:
case WINDIVERT_FILTER_FIELD_IPV6_FLOWLABEL:
case WINDIVERT_FILTER_FIELD_IPV6_LENGTH:
case WINDIVERT_FILTER_FIELD_IPV6_NEXTHDR:
case WINDIVERT_FILTER_FIELD_IPV6_HOPLIMIT:
case WINDIVERT_FILTER_FIELD_IPV6_SRCADDR:
case WINDIVERT_FILTER_FIELD_IPV6_DSTADDR:
result = (layer == WINDIVERT_LAYER_NETWORK ||
layer == WINDIVERT_LAYER_NETWORK_FORWARD);
result = result && (ipv6_header != NULL);
break;
case WINDIVERT_FILTER_FIELD_ICMP_TYPE:
case WINDIVERT_FILTER_FIELD_ICMP_CODE:
case WINDIVERT_FILTER_FIELD_ICMP_CHECKSUM:
case WINDIVERT_FILTER_FIELD_ICMP_BODY:
result = (layer == WINDIVERT_LAYER_NETWORK ||
layer == WINDIVERT_LAYER_NETWORK_FORWARD);
result = result && (icmp_header != NULL);
break;
case WINDIVERT_FILTER_FIELD_ICMPV6_TYPE:
case WINDIVERT_FILTER_FIELD_ICMPV6_CODE:
case WINDIVERT_FILTER_FIELD_ICMPV6_CHECKSUM:
case WINDIVERT_FILTER_FIELD_ICMPV6_BODY:
result = (layer == WINDIVERT_LAYER_NETWORK ||
layer == WINDIVERT_LAYER_NETWORK_FORWARD);
result = result && (icmpv6_header != NULL);
break;
case WINDIVERT_FILTER_FIELD_TCP_SRCPORT:
case WINDIVERT_FILTER_FIELD_TCP_DSTPORT:
case WINDIVERT_FILTER_FIELD_TCP_SEQNUM:
case WINDIVERT_FILTER_FIELD_TCP_ACKNUM:
case WINDIVERT_FILTER_FIELD_TCP_HDRLENGTH:
case WINDIVERT_FILTER_FIELD_TCP_URG:
case WINDIVERT_FILTER_FIELD_TCP_ACK:
case WINDIVERT_FILTER_FIELD_TCP_PSH:
case WINDIVERT_FILTER_FIELD_TCP_RST:
case WINDIVERT_FILTER_FIELD_TCP_SYN:
case WINDIVERT_FILTER_FIELD_TCP_FIN:
case WINDIVERT_FILTER_FIELD_TCP_WINDOW:
case WINDIVERT_FILTER_FIELD_TCP_CHECKSUM:
case WINDIVERT_FILTER_FIELD_TCP_URGPTR:
case WINDIVERT_FILTER_FIELD_TCP_PAYLOAD:
case WINDIVERT_FILTER_FIELD_TCP_PAYLOAD16:
case WINDIVERT_FILTER_FIELD_TCP_PAYLOAD32:
case WINDIVERT_FILTER_FIELD_TCP_PAYLOADLENGTH:
result = (layer == WINDIVERT_LAYER_NETWORK ||
layer == WINDIVERT_LAYER_NETWORK_FORWARD);
result = result && (tcp_header != NULL);
break;
case WINDIVERT_FILTER_FIELD_UDP_SRCPORT:
case WINDIVERT_FILTER_FIELD_UDP_DSTPORT:
case WINDIVERT_FILTER_FIELD_UDP_LENGTH:
case WINDIVERT_FILTER_FIELD_UDP_CHECKSUM:
case WINDIVERT_FILTER_FIELD_UDP_PAYLOAD:
case WINDIVERT_FILTER_FIELD_UDP_PAYLOAD16:
case WINDIVERT_FILTER_FIELD_UDP_PAYLOAD32:
case WINDIVERT_FILTER_FIELD_UDP_PAYLOADLENGTH:
result = (layer == WINDIVERT_LAYER_NETWORK ||
layer == WINDIVERT_LAYER_NETWORK_FORWARD);
result = result && (udp_header != NULL);
break;
default:
return FALSE;
}
if (result)
{
switch (filter[ip].field)
{
case WINDIVERT_FILTER_FIELD_ZERO:
field[0] = 0;
break;
case WINDIVERT_FILTER_FIELD_EVENT:
field[0] = (UINT32)event;
break;
case WINDIVERT_FILTER_FIELD_RANDOM8:
field[0] = (UINT32)((random64 >> 48) & 0xFF);
break;
case WINDIVERT_FILTER_FIELD_RANDOM16:
field[0] = (UINT32)((random64 >> 32) & 0xFFFF);
break;
case WINDIVERT_FILTER_FIELD_RANDOM32:
field[0] = (UINT32)random64;
break;
case WINDIVERT_FILTER_FIELD_PACKET:
result = windivert_get_data(buffer, /*offset=*/0,
(INT)filter[ip].arg[1], sizeof(data8), &data8);
field[0] = (UINT32)data8;
break;
case WINDIVERT_FILTER_FIELD_PACKET16:
result = windivert_get_data(buffer, /*offset=*/0,
(INT)filter[ip].arg[1], sizeof(data16), &data16);
field[0] = (UINT32)RtlUshortByteSwap(data16);
break;
case WINDIVERT_FILTER_FIELD_PACKET32:
result = windivert_get_data(buffer, /*offset=*/0,
(INT)filter[ip].arg[1], sizeof(data32), &data32);
field[0] = (UINT32)RtlUlongByteSwap(data32);
break;
case WINDIVERT_FILTER_FIELD_TCP_PAYLOAD:
case WINDIVERT_FILTER_FIELD_UDP_PAYLOAD:
result = windivert_get_data(buffer, header_len,
(INT)filter[ip].arg[1], sizeof(data8), &data8);
field[0] = (UINT32)data8;
break;
case WINDIVERT_FILTER_FIELD_TCP_PAYLOAD16:
case WINDIVERT_FILTER_FIELD_UDP_PAYLOAD16:
result = windivert_get_data(buffer, header_len,
(INT)filter[ip].arg[1], sizeof(data16), &data16);
field[0] = (UINT32)RtlUshortByteSwap(data16);
break;
case WINDIVERT_FILTER_FIELD_TCP_PAYLOAD32:
case WINDIVERT_FILTER_FIELD_UDP_PAYLOAD32:
result = windivert_get_data(buffer, header_len,
(INT)filter[ip].arg[1], sizeof(data32), &data32);
field[0] = (UINT32)RtlUlongByteSwap(data32);
break;
case WINDIVERT_FILTER_FIELD_INBOUND:
field[0] = (UINT32)!outbound;
break;
case WINDIVERT_FILTER_FIELD_OUTBOUND:
field[0] = (UINT32)outbound;
break;
case WINDIVERT_FILTER_FIELD_IFIDX:
field[0] = network_data->IfIdx;
break;
case WINDIVERT_FILTER_FIELD_SUBIFIDX:
field[0] = network_data->SubIfIdx;
break;
case WINDIVERT_FILTER_FIELD_LOOPBACK:
field[0] = (UINT32)loopback;
break;
case WINDIVERT_FILTER_FIELD_IMPOSTOR:
field[0] = (UINT32)impostor;
break;
case WINDIVERT_FILTER_FIELD_IP:
field[0] = (UINT32)ipv4;
break;
case WINDIVERT_FILTER_FIELD_IPV6:
field[0] = (UINT32)!ipv4;
break;
case WINDIVERT_FILTER_FIELD_ICMP:
switch (layer)
{
case WINDIVERT_LAYER_NETWORK:
case WINDIVERT_LAYER_NETWORK_FORWARD:
field[0] = (UINT32)(icmp_header != NULL);
break;
case WINDIVERT_LAYER_SOCKET:
field[0] = (UINT32)(ipv4 &&
socket_data->Protocol == IPPROTO_ICMP);
break;
case WINDIVERT_LAYER_FLOW:
field[0] = (UINT32)(ipv4 &&
flow_data->Protocol == IPPROTO_ICMP);
break;
default:
return FALSE;
}
break;
case WINDIVERT_FILTER_FIELD_ICMPV6:
switch (layer)
{
case WINDIVERT_LAYER_NETWORK:
case WINDIVERT_LAYER_NETWORK_FORWARD:
field[0] = (UINT32)(icmpv6_header != NULL);
break;
case WINDIVERT_LAYER_SOCKET:
field[0] = (UINT32)(!ipv4 &&
socket_data->Protocol == IPPROTO_ICMPV6);
break;
case WINDIVERT_LAYER_FLOW:
field[0] = (UINT32)(!ipv4 &&
flow_data->Protocol == IPPROTO_ICMPV6);
break;
default:
return FALSE;
}
break;
case WINDIVERT_FILTER_FIELD_TCP:
switch (layer)
{
case WINDIVERT_LAYER_NETWORK:
case WINDIVERT_LAYER_NETWORK_FORWARD:
field[0] = (UINT32)(tcp_header != NULL);
break;
case WINDIVERT_LAYER_SOCKET:
field[0] =
(UINT32)(socket_data->Protocol == IPPROTO_TCP);
break;
case WINDIVERT_LAYER_FLOW:
field[0] =
(UINT32)(flow_data->Protocol == IPPROTO_TCP);
break;
default:
return FALSE;
}
break;
case WINDIVERT_FILTER_FIELD_UDP:
switch (layer)
{
case WINDIVERT_LAYER_NETWORK:
case WINDIVERT_LAYER_NETWORK_FORWARD:
field[0] = (UINT32)(udp_header != NULL);
break;
case WINDIVERT_LAYER_SOCKET:
field[0] =
(UINT32)(socket_data->Protocol == IPPROTO_UDP);
break;
case WINDIVERT_LAYER_FLOW:
field[0] =
(UINT32)(flow_data->Protocol == IPPROTO_UDP);
break;
default:
return FALSE;
}
break;
case WINDIVERT_FILTER_FIELD_IP_HDRLENGTH:
field[0] = (UINT32)ip_header->HdrLength;
break;
case WINDIVERT_FILTER_FIELD_IP_TOS:
field[0] = (UINT32)ip_header->TOS;
break;
case WINDIVERT_FILTER_FIELD_IP_LENGTH:
field[0] = (UINT32)RtlUshortByteSwap(ip_header->Length);
break;
case WINDIVERT_FILTER_FIELD_IP_ID:
field[0] = (UINT32)RtlUshortByteSwap(ip_header->Id);
break;
case WINDIVERT_FILTER_FIELD_IP_DF:
field[0] = (UINT32)WINDIVERT_IPHDR_GET_DF(ip_header);
break;
case WINDIVERT_FILTER_FIELD_IP_MF:
field[0] = (UINT32)WINDIVERT_IPHDR_GET_MF(ip_header);
break;
case WINDIVERT_FILTER_FIELD_IP_FRAGOFF:
field[0] = (UINT32)RtlUshortByteSwap(
WINDIVERT_IPHDR_GET_FRAGOFF(ip_header));
break;
case WINDIVERT_FILTER_FIELD_IP_TTL:
field[0] = (UINT32)ip_header->TTL;
break;
case WINDIVERT_FILTER_FIELD_IP_PROTOCOL:
field[0] = (UINT32)ip_header->Protocol;
break;
case WINDIVERT_FILTER_FIELD_IP_CHECKSUM:
field[0] = (UINT32)RtlUshortByteSwap(ip_header->Checksum);
break;
case WINDIVERT_FILTER_FIELD_IP_SRCADDR:
field[1] = 0x0000FFFF;
field[0] = (UINT32)RtlUlongByteSwap(ip_header->SrcAddr);
break;
case WINDIVERT_FILTER_FIELD_IP_DSTADDR:
field[1] = 0x0000FFFF;
field[0] = (UINT32)RtlUlongByteSwap(ip_header->DstAddr);
break;
case WINDIVERT_FILTER_FIELD_IPV6_TRAFFICCLASS:
field[0] =
(UINT32)WINDIVERT_IPV6HDR_GET_TRAFFICCLASS(ipv6_header);
break;
case WINDIVERT_FILTER_FIELD_IPV6_FLOWLABEL:
field[0] = (UINT32)RtlUlongByteSwap(
WINDIVERT_IPV6HDR_GET_FLOWLABEL(ipv6_header));
break;
case WINDIVERT_FILTER_FIELD_IPV6_LENGTH:
field[0] = (UINT32)RtlUshortByteSwap(ipv6_header->Length);
break;
case WINDIVERT_FILTER_FIELD_IPV6_NEXTHDR:
field[0] = (UINT32)ipv6_header->NextHdr;
break;
case WINDIVERT_FILTER_FIELD_IPV6_HOPLIMIT:
field[0] = (UINT32)ipv6_header->HopLimit;
break;
case WINDIVERT_FILTER_FIELD_IPV6_SRCADDR:
big = TRUE;
field[3] =
(UINT32)RtlUlongByteSwap(ipv6_header->SrcAddr[0]);
field[2] =
(UINT32)RtlUlongByteSwap(ipv6_header->SrcAddr[1]);
field[1] =
(UINT32)RtlUlongByteSwap(ipv6_header->SrcAddr[2]);
field[0] =
(UINT32)RtlUlongByteSwap(ipv6_header->SrcAddr[3]);
break;
case WINDIVERT_FILTER_FIELD_IPV6_DSTADDR:
big = TRUE;
field[3] =
(UINT32)RtlUlongByteSwap(ipv6_header->DstAddr[0]);
field[2] =
(UINT32)RtlUlongByteSwap(ipv6_header->DstAddr[1]);
field[1] =
(UINT32)RtlUlongByteSwap(ipv6_header->DstAddr[2]);
field[0] =
(UINT32)RtlUlongByteSwap(ipv6_header->DstAddr[3]);
break;
case WINDIVERT_FILTER_FIELD_ICMP_TYPE:
field[0] = (UINT32)icmp_header->Type;
break;
case WINDIVERT_FILTER_FIELD_ICMP_CODE:
field[0] = (UINT32)icmp_header->Code;
break;
case WINDIVERT_FILTER_FIELD_ICMP_CHECKSUM:
field[0] =
(UINT32)RtlUshortByteSwap(icmp_header->Checksum);
break;
case WINDIVERT_FILTER_FIELD_ICMP_BODY:
field[0] = (UINT32)RtlUlongByteSwap(icmp_header->Body);
break;
case WINDIVERT_FILTER_FIELD_ICMPV6_TYPE:
field[0] = (UINT32)icmpv6_header->Type;
break;
case WINDIVERT_FILTER_FIELD_ICMPV6_CODE:
field[0] = (UINT32)icmpv6_header->Code;
break;
case WINDIVERT_FILTER_FIELD_ICMPV6_CHECKSUM:
field[0] =
(UINT32)RtlUshortByteSwap(icmpv6_header->Checksum);
break;
case WINDIVERT_FILTER_FIELD_ICMPV6_BODY:
field[0] =
(UINT32)RtlUlongByteSwap(icmpv6_header->Body);
break;
case WINDIVERT_FILTER_FIELD_TCP_SRCPORT:
field[0] = (UINT32)RtlUshortByteSwap(tcp_header->SrcPort);
break;
case WINDIVERT_FILTER_FIELD_TCP_DSTPORT:
field[0] = (UINT32)RtlUshortByteSwap(tcp_header->DstPort);
break;
case WINDIVERT_FILTER_FIELD_TCP_SEQNUM:
field[0] = (UINT32)RtlUlongByteSwap(tcp_header->SeqNum);
break;
case WINDIVERT_FILTER_FIELD_TCP_ACKNUM:
field[0] = (UINT32)RtlUlongByteSwap(tcp_header->AckNum);
break;
case WINDIVERT_FILTER_FIELD_TCP_HDRLENGTH:
field[0] = (UINT32)tcp_header->HdrLength;
break;
case WINDIVERT_FILTER_FIELD_TCP_URG:
field[0] = (UINT32)tcp_header->Urg;
break;
case WINDIVERT_FILTER_FIELD_TCP_ACK:
field[0] = (UINT32)tcp_header->Ack;
break;
case WINDIVERT_FILTER_FIELD_TCP_PSH:
field[0] = (UINT32)tcp_header->Psh;
break;
case WINDIVERT_FILTER_FIELD_TCP_RST:
field[0] = (UINT32)tcp_header->Rst;
break;
case WINDIVERT_FILTER_FIELD_TCP_SYN:
field[0] = (UINT32)tcp_header->Syn;
break;
case WINDIVERT_FILTER_FIELD_TCP_FIN:
field[0] = (UINT32)tcp_header->Fin;
break;
case WINDIVERT_FILTER_FIELD_TCP_WINDOW:
field[0] = (UINT32)RtlUshortByteSwap(tcp_header->Window);
break;
case WINDIVERT_FILTER_FIELD_TCP_CHECKSUM:
field[0] = (UINT32)RtlUshortByteSwap(tcp_header->Checksum);
break;
case WINDIVERT_FILTER_FIELD_TCP_URGPTR:
field[0] = (UINT32)RtlUshortByteSwap(tcp_header->UrgPtr);
break;
case WINDIVERT_FILTER_FIELD_TCP_PAYLOADLENGTH:
field[0] = (UINT32)payload_len;
break;
case WINDIVERT_FILTER_FIELD_UDP_SRCPORT:
field[0] = (UINT32)RtlUshortByteSwap(udp_header->SrcPort);
break;
case WINDIVERT_FILTER_FIELD_UDP_DSTPORT:
field[0] = (UINT32)RtlUshortByteSwap(udp_header->DstPort);
break;
case WINDIVERT_FILTER_FIELD_UDP_LENGTH:
field[0] = (UINT32)RtlUshortByteSwap(udp_header->Length);
break;
case WINDIVERT_FILTER_FIELD_UDP_CHECKSUM:
field[0] = (UINT32)RtlUshortByteSwap(udp_header->Checksum);
break;
case WINDIVERT_FILTER_FIELD_UDP_PAYLOADLENGTH:
field[0] = (UINT32)payload_len;
break;
case WINDIVERT_FILTER_FIELD_LOCALADDR:
big = TRUE;
switch (layer)
{
case WINDIVERT_LAYER_NETWORK:
if (ipv4)
{
field[1] = 0x0000FFFF;
field[0] = (UINT32)RtlUlongByteSwap(
(outbound? ip_header->SrcAddr:
ip_header->DstAddr));
}
else if (outbound)
{
field[3] = (UINT32)RtlUlongByteSwap(
ipv6_header->SrcAddr[0]);
field[2] = (UINT32)RtlUlongByteSwap(
ipv6_header->SrcAddr[1]);
field[1] = (UINT32)RtlUlongByteSwap(
ipv6_header->SrcAddr[2]);
field[0] = (UINT32)RtlUlongByteSwap(
ipv6_header->SrcAddr[3]);
}
else
{
field[3] = (UINT32)RtlUlongByteSwap(
ipv6_header->DstAddr[0]);
field[2] = (UINT32)RtlUlongByteSwap(
ipv6_header->DstAddr[1]);
field[1] = (UINT32)RtlUlongByteSwap(
ipv6_header->DstAddr[2]);
field[0] = (UINT32)RtlUlongByteSwap(
ipv6_header->DstAddr[3]);
}
break;
case WINDIVERT_LAYER_FLOW:
field[0] = flow_data->LocalAddr[0];
field[1] = flow_data->LocalAddr[1];
field[2] = flow_data->LocalAddr[2];
field[3] = flow_data->LocalAddr[3];
break;
case WINDIVERT_LAYER_SOCKET:
field[0] = socket_data->LocalAddr[0];
field[1] = socket_data->LocalAddr[1];
field[2] = socket_data->LocalAddr[2];
field[3] = socket_data->LocalAddr[3];
break;
default:
return FALSE;
}
break;
case WINDIVERT_FILTER_FIELD_REMOTEADDR:
big = TRUE;
switch (layer)
{
case WINDIVERT_LAYER_NETWORK:
if (ipv4)
{
field[1] = 0x0000FFFF;
field[0] = (UINT32)RtlUlongByteSwap(
(!outbound? ip_header->SrcAddr:
ip_header->DstAddr));
}
else if (!outbound)
{
field[3] = (UINT32)RtlUlongByteSwap(
ipv6_header->SrcAddr[0]);
field[2] = (UINT32)RtlUlongByteSwap(
ipv6_header->SrcAddr[1]);
field[1] = (UINT32)RtlUlongByteSwap(
ipv6_header->SrcAddr[2]);
field[0] = (UINT32)RtlUlongByteSwap(
ipv6_header->SrcAddr[3]);
}
else
{
field[3] = (UINT32)RtlUlongByteSwap(
ipv6_header->DstAddr[0]);
field[2] = (UINT32)RtlUlongByteSwap(
ipv6_header->DstAddr[1]);
field[1] = (UINT32)RtlUlongByteSwap(
ipv6_header->DstAddr[2]);
field[0] = (UINT32)RtlUlongByteSwap(
ipv6_header->DstAddr[3]);
}
break;
case WINDIVERT_LAYER_FLOW:
field[0] = flow_data->RemoteAddr[0];
field[1] = flow_data->RemoteAddr[1];
field[2] = flow_data->RemoteAddr[2];
field[3] = flow_data->RemoteAddr[3];
break;
case WINDIVERT_LAYER_SOCKET:
field[0] = socket_data->RemoteAddr[0];
field[1] = socket_data->RemoteAddr[1];
field[2] = socket_data->RemoteAddr[2];
field[3] = socket_data->RemoteAddr[3];
break;
default:
return FALSE;
}
break;
case WINDIVERT_FILTER_FIELD_LOCALPORT:
switch (layer)
{
case WINDIVERT_LAYER_NETWORK:
if (tcp_header != NULL)
{
field[0] = (UINT32)RtlUshortByteSwap(
(outbound? tcp_header->SrcPort:
tcp_header->DstPort));
}
else if (udp_header != NULL)
{
field[0] = (UINT32)RtlUshortByteSwap(
(outbound? udp_header->SrcPort:
udp_header->DstPort));
}
else
{
field[0] = 0;
}
break;
case WINDIVERT_LAYER_FLOW:
field[0] = (UINT32)flow_data->LocalPort;
break;
case WINDIVERT_LAYER_SOCKET:
field[0] = (UINT32)socket_data->LocalPort;
break;
default:
return FALSE;
}
break;
case WINDIVERT_FILTER_FIELD_REMOTEPORT:
switch (layer)
{
case WINDIVERT_LAYER_NETWORK:
if (tcp_header != NULL)
{
field[0] = (UINT32)RtlUshortByteSwap(
(!outbound? tcp_header->SrcPort:
tcp_header->DstPort));
}
else if (udp_header != NULL)
{
field[0] = (UINT32)RtlUshortByteSwap(
(!outbound? udp_header->SrcPort:
udp_header->DstPort));
}
else
{
field[0] = 0;
}
break;
case WINDIVERT_LAYER_FLOW:
field[0] = (UINT32)flow_data->RemotePort;
break;
case WINDIVERT_LAYER_SOCKET:
field[0] = (UINT32)socket_data->RemotePort;
break;
default:
return FALSE;
}
break;
case WINDIVERT_FILTER_FIELD_PROTOCOL:
switch (layer)
{
case WINDIVERT_LAYER_NETWORK:
field[0] = (UINT32)protocol;
break;
case WINDIVERT_LAYER_FLOW:
field[0] = (UINT32)flow_data->Protocol;
break;
case WINDIVERT_LAYER_SOCKET:
field[0] = (UINT32)socket_data->Protocol;
break;
default:
return FALSE;
}
break;
case WINDIVERT_FILTER_FIELD_PROCESSID:
switch (layer)
{
case WINDIVERT_LAYER_FLOW:
field[0] = flow_data->ProcessId;
break;
case WINDIVERT_LAYER_SOCKET:
field[0] = socket_data->ProcessId;
break;
case WINDIVERT_LAYER_REFLECT:
field[0] = reflect_data->ProcessId;
break;
default:
return FALSE;
}
break;
case WINDIVERT_FILTER_FIELD_LAYER:
field[0] = reflect_data->Layer;
break;
default:
return FALSE;
}
}
if (result)
{
cmp = windivert_big_num_compare(field, filter[ip].arg, big);
switch (filter[ip].test)
{
case WINDIVERT_FILTER_TEST_EQ:
result = (cmp == 0);
break;
case WINDIVERT_FILTER_TEST_NEQ:
result = (cmp != 0);
break;
case WINDIVERT_FILTER_TEST_LT:
result = (cmp < 0);
break;
case WINDIVERT_FILTER_TEST_LEQ:
result = (cmp <= 0);
break;
case WINDIVERT_FILTER_TEST_GT:
result = (cmp > 0);
break;
case WINDIVERT_FILTER_TEST_GEQ:
result = (cmp >= 0);
break;
default:
return FALSE;
}
}
ip = (result? filter[ip].success: filter[ip].failure);
if (ip == WINDIVERT_FILTER_RESULT_ACCEPT)
{
return TRUE;
}
if (ip == WINDIVERT_FILTER_RESULT_REJECT)
{
return FALSE;
}
}
DEBUG("FILTER: REJECT (filter TTL exceeded)");
return FALSE;
}
/*
* Compile a WinDivert filter from an IOCTL.
*/
static const WINDIVERT_FILTER *windivert_filter_compile(
const WINDIVERT_FILTER *ioctl_filter, size_t ioctl_filter_len,
WINDIVERT_LAYER layer)
{
PWINDIVERT_FILTER filter = NULL;
WINDIVERT_EVENT event;
UINT16 i;
size_t length;
if (ioctl_filter_len % sizeof(WINDIVERT_FILTER) != 0)
{
goto windivert_filter_compile_error;
}
length = ioctl_filter_len / sizeof(WINDIVERT_FILTER);
if (length >= WINDIVERT_FILTER_MAXLEN || length == 0)
{
goto windivert_filter_compile_error;
}
filter = (PWINDIVERT_FILTER)windivert_malloc(
length * sizeof(WINDIVERT_FILTER), FALSE);
if (filter == NULL)
{
goto windivert_filter_compile_error;
}
for (i = 0; i < length; i++)
{
if (ioctl_filter[i].field > WINDIVERT_FILTER_FIELD_MAX ||
ioctl_filter[i].test > WINDIVERT_FILTER_TEST_MAX)
{
goto windivert_filter_compile_error;
}
switch (ioctl_filter[i].success)
{
case WINDIVERT_FILTER_RESULT_ACCEPT:
case WINDIVERT_FILTER_RESULT_REJECT:
break;
default:
if (ioctl_filter[i].success <= i ||
ioctl_filter[i].success >= length)
{
goto windivert_filter_compile_error;
}
break;
}
switch (ioctl_filter[i].failure)
{
case WINDIVERT_FILTER_RESULT_ACCEPT:
case WINDIVERT_FILTER_RESULT_REJECT:
break;
default:
if (ioctl_filter[i].failure <= i ||
ioctl_filter[i].failure >= length)
{
goto windivert_filter_compile_error;
}
break;
}
// Enforce ranges:
if (ioctl_filter[i].field != WINDIVERT_FILTER_FIELD_IPV6_SRCADDR &&
ioctl_filter[i].field != WINDIVERT_FILTER_FIELD_IPV6_DSTADDR &&
ioctl_filter[i].field != WINDIVERT_FILTER_FIELD_LOCALADDR &&
ioctl_filter[i].field != WINDIVERT_FILTER_FIELD_REMOTEADDR)
{
if (ioctl_filter[i].arg[2] != 0 ||
ioctl_filter[i].arg[3] != 0)
{
goto windivert_filter_compile_error;
}
switch (ioctl_filter[i].field)
{
case WINDIVERT_FILTER_FIELD_IP_SRCADDR:
case WINDIVERT_FILTER_FIELD_IP_DSTADDR:
if (ioctl_filter[i].arg[1] != 0x0000FFFF)
{
goto windivert_filter_compile_error;
}
break;
case WINDIVERT_FILTER_FIELD_PACKET:
case WINDIVERT_FILTER_FIELD_PACKET16:
case WINDIVERT_FILTER_FIELD_PACKET32:
case WINDIVERT_FILTER_FIELD_TCP_PAYLOAD:
case WINDIVERT_FILTER_FIELD_TCP_PAYLOAD16:
case WINDIVERT_FILTER_FIELD_TCP_PAYLOAD32:
case WINDIVERT_FILTER_FIELD_UDP_PAYLOAD:
case WINDIVERT_FILTER_FIELD_UDP_PAYLOAD16:
case WINDIVERT_FILTER_FIELD_UDP_PAYLOAD32:
{
INT idx = (INT)ioctl_filter[i].arg[1];
if (idx > UINT16_MAX || idx < -UINT16_MAX)
{
goto windivert_filter_compile_error;
}
break;
}
default:
if (ioctl_filter[i].arg[1] != 0)
{
goto windivert_filter_compile_error;
}
break;
}
}
switch (ioctl_filter[i].field)
{
case WINDIVERT_FILTER_FIELD_ZERO:
case WINDIVERT_FILTER_FIELD_INBOUND:
case WINDIVERT_FILTER_FIELD_OUTBOUND:
case WINDIVERT_FILTER_FIELD_IP:
case WINDIVERT_FILTER_FIELD_IPV6:
case WINDIVERT_FILTER_FIELD_ICMP:
case WINDIVERT_FILTER_FIELD_ICMPV6:
case WINDIVERT_FILTER_FIELD_TCP:
case WINDIVERT_FILTER_FIELD_UDP:
case WINDIVERT_FILTER_FIELD_IP_DF:
case WINDIVERT_FILTER_FIELD_IP_MF:
case WINDIVERT_FILTER_FIELD_TCP_URG:
case WINDIVERT_FILTER_FIELD_TCP_ACK:
case WINDIVERT_FILTER_FIELD_TCP_PSH:
case WINDIVERT_FILTER_FIELD_TCP_RST:
case WINDIVERT_FILTER_FIELD_TCP_SYN:
case WINDIVERT_FILTER_FIELD_TCP_FIN:
if (ioctl_filter[i].arg[0] > 1)
{
goto windivert_filter_compile_error;
}
break;
case WINDIVERT_FILTER_FIELD_LAYER:
if (ioctl_filter[i].arg[0] > WINDIVERT_LAYER_MAX)
{
goto windivert_filter_compile_error;
}
break;
case WINDIVERT_FILTER_FIELD_EVENT:
event = (WINDIVERT_EVENT)ioctl_filter[i].arg[0];
switch (layer)
{
case WINDIVERT_LAYER_NETWORK:
case WINDIVERT_LAYER_NETWORK_FORWARD:
if (event != WINDIVERT_EVENT_NETWORK_PACKET)
{
goto windivert_filter_compile_error;
}
break;
case WINDIVERT_LAYER_FLOW:
if (event != WINDIVERT_EVENT_FLOW_ESTABLISHED &&
event != WINDIVERT_EVENT_FLOW_DELETED)
{
goto windivert_filter_compile_error;
}
break;
case WINDIVERT_LAYER_SOCKET:
if (event != WINDIVERT_EVENT_SOCKET_BIND &&
event != WINDIVERT_EVENT_SOCKET_CONNECT &&
event != WINDIVERT_EVENT_SOCKET_LISTEN &&
event != WINDIVERT_EVENT_SOCKET_ACCEPT)
{
goto windivert_filter_compile_error;
}
break;
case WINDIVERT_LAYER_REFLECT:
if (event != WINDIVERT_EVENT_REFLECT_OPEN &&
event != WINDIVERT_EVENT_REFLECT_CLOSE)
{
goto windivert_filter_compile_error;
}
break;
default:
goto windivert_filter_compile_error;
}
break;
case WINDIVERT_FILTER_FIELD_IP_HDRLENGTH:
case WINDIVERT_FILTER_FIELD_TCP_HDRLENGTH:
if (ioctl_filter[i].arg[0] > 0x0F)
{
goto windivert_filter_compile_error;
}
break;
case WINDIVERT_FILTER_FIELD_IP_TOS:
case WINDIVERT_FILTER_FIELD_IP_TTL:
case WINDIVERT_FILTER_FIELD_IP_PROTOCOL:
case WINDIVERT_FILTER_FIELD_IPV6_TRAFFICCLASS:
case WINDIVERT_FILTER_FIELD_IPV6_NEXTHDR:
case WINDIVERT_FILTER_FIELD_IPV6_HOPLIMIT:
case WINDIVERT_FILTER_FIELD_ICMP_TYPE:
case WINDIVERT_FILTER_FIELD_ICMP_CODE:
case WINDIVERT_FILTER_FIELD_ICMPV6_TYPE:
case WINDIVERT_FILTER_FIELD_ICMPV6_CODE:
case WINDIVERT_FILTER_FIELD_PROTOCOL:
case WINDIVERT_FILTER_FIELD_PACKET:
case WINDIVERT_FILTER_FIELD_TCP_PAYLOAD:
case WINDIVERT_FILTER_FIELD_UDP_PAYLOAD:
case WINDIVERT_FILTER_FIELD_RANDOM8:
if (ioctl_filter[i].arg[0] > UINT8_MAX)
{
goto windivert_filter_compile_error;
}
break;
case WINDIVERT_FILTER_FIELD_IP_FRAGOFF:
if (ioctl_filter[i].arg[0] > 0x1FFF)
{
goto windivert_filter_compile_error;
}
break;
case WINDIVERT_FILTER_FIELD_IP_LENGTH:
case WINDIVERT_FILTER_FIELD_IP_ID:
case WINDIVERT_FILTER_FIELD_IP_CHECKSUM:
case WINDIVERT_FILTER_FIELD_IPV6_LENGTH:
case WINDIVERT_FILTER_FIELD_ICMP_CHECKSUM:
case WINDIVERT_FILTER_FIELD_ICMPV6_CHECKSUM:
case WINDIVERT_FILTER_FIELD_TCP_SRCPORT:
case WINDIVERT_FILTER_FIELD_TCP_DSTPORT:
case WINDIVERT_FILTER_FIELD_TCP_WINDOW:
case WINDIVERT_FILTER_FIELD_TCP_CHECKSUM:
case WINDIVERT_FILTER_FIELD_TCP_URGPTR:
case WINDIVERT_FILTER_FIELD_TCP_PAYLOADLENGTH:
case WINDIVERT_FILTER_FIELD_UDP_SRCPORT:
case WINDIVERT_FILTER_FIELD_UDP_DSTPORT:
case WINDIVERT_FILTER_FIELD_UDP_LENGTH:
case WINDIVERT_FILTER_FIELD_UDP_CHECKSUM:
case WINDIVERT_FILTER_FIELD_UDP_PAYLOADLENGTH:
case WINDIVERT_FILTER_FIELD_LOCALPORT:
case WINDIVERT_FILTER_FIELD_REMOTEPORT:
case WINDIVERT_FILTER_FIELD_PACKET16:
case WINDIVERT_FILTER_FIELD_TCP_PAYLOAD16:
case WINDIVERT_FILTER_FIELD_UDP_PAYLOAD16:
case WINDIVERT_FILTER_FIELD_RANDOM16:
if (ioctl_filter[i].arg[0] > UINT16_MAX)
{
goto windivert_filter_compile_error;
}
break;
case WINDIVERT_FILTER_FIELD_IPV6_FLOWLABEL:
if (ioctl_filter[i].arg[0] > 0x000FFFFF)
{
goto windivert_filter_compile_error;
}
break;
default:
break;
}
filter[i].field = ioctl_filter[i].field;
filter[i].test = ioctl_filter[i].test;
filter[i].success = ioctl_filter[i].success;
filter[i].failure = ioctl_filter[i].failure;
filter[i].arg[0] = ioctl_filter[i].arg[0];
filter[i].arg[1] = ioctl_filter[i].arg[1];
filter[i].arg[2] = ioctl_filter[i].arg[2];
filter[i].arg[3] = ioctl_filter[i].arg[3];
}
return filter;
windivert_filter_compile_error:
windivert_free((PVOID)filter);
return NULL;
}
/****************************************************************************/
/* WINDIVERT REFLECT MANAGER IMPLEMENTATION */
/****************************************************************************/
#define WINDIVERT_REFLECT_PSEUDO_PACKET_MAX 12288
/*
* WinDivert reflect state.
*/
static BOOL reflect_inited = FALSE; // Reflection initialized?
static BOOL reflect_worker_queued = FALSE; // Reflect worker queued?
static KSPIN_LOCK reflect_lock; // Reflect lock.
static LIST_ENTRY reflect_event_queue; // Reflect event queue.
static LIST_ENTRY reflect_contexts; // All open (non-REFLECT) contexts.
static LIST_ENTRY reflect_waiters; // All open REFLECT contexts.
static WDFWORKITEM reflect_worker; // Reflect work item.
#pragma data_seg(push, stack, "PAGE")
static UINT8 reflect_pseudo_packet[WINDIVERT_REFLECT_PSEUDO_PACKET_MAX];
#pragma data_seg(pop, stack)
/*
* Initialize the reflection layer implementation.
*/
static NTSTATUS windivert_reflect_init(WDFOBJECT parent)
{
WDF_WORKITEM_CONFIG item_config;
WDF_OBJECT_ATTRIBUTES obj_attrs;
NTSTATUS status;
KeInitializeSpinLock(&reflect_lock);
InitializeListHead(&reflect_event_queue);
InitializeListHead(&reflect_contexts);
InitializeListHead(&reflect_waiters);
WDF_WORKITEM_CONFIG_INIT(&item_config, windivert_reflect_worker);
item_config.AutomaticSerialization = FALSE;
WDF_OBJECT_ATTRIBUTES_INIT(&obj_attrs);
obj_attrs.ParentObject = parent;
status = WdfWorkItemCreate(&item_config, &obj_attrs, &reflect_worker);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR("failed to create reflection work item", status);
return status;
}
reflect_inited = TRUE;
return STATUS_SUCCESS;
}
/*
* Cleanup the reflection layer implementation.
*/
static void windivert_reflect_close(void)
{
if (!reflect_inited)
{
return;
}
WdfWorkItemFlush(reflect_worker);
WdfObjectDelete(reflect_worker);
}
/*
* WinDivert handle reflect open event.
*/
static void windivert_reflect_open_event(context_t context)
{
KLOCK_QUEUE_HANDLE lock_handle;
WDFOBJECT object;
reflect_event_t reflect_event;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
object = (WDFOBJECT)context->object;
// To be released on the close event. This ensures the context object
// remains valid until the close event has been handled.
WdfObjectReference(object);
context->reflect.open = TRUE;
KeReleaseInStackQueuedSpinLock(&lock_handle);
// Queue the event:
reflect_event = &context->reflect.open_event;
reflect_event->context = context;
reflect_event->event = WINDIVERT_EVENT_REFLECT_OPEN;
KeAcquireInStackQueuedSpinLock(&reflect_lock, &lock_handle);
InsertTailList(&reflect_event_queue, &reflect_event->entry);
if (!reflect_worker_queued)
{
WdfWorkItemEnqueue(reflect_worker);
reflect_worker_queued = TRUE;
}
KeReleaseInStackQueuedSpinLock(&lock_handle);
}
/*
* WinDivert handle reflect close event.
*/
static void windivert_reflect_close_event(context_t context)
{
KLOCK_QUEUE_HANDLE lock_handle;
reflect_event_t reflect_event;
BOOL open;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
open = context->reflect.open;
KeReleaseInStackQueuedSpinLock(&lock_handle);
if (!open)
{
return;
}
// Queue the event:
reflect_event = &context->reflect.close_event;
reflect_event->context = context;
reflect_event->event = WINDIVERT_EVENT_REFLECT_CLOSE;
KeAcquireInStackQueuedSpinLock(&reflect_lock, &lock_handle);
InsertTailList(&reflect_event_queue, &reflect_event->entry);
if (!reflect_worker_queued)
{
WdfWorkItemEnqueue(reflect_worker);
reflect_worker_queued = TRUE;
}
KeReleaseInStackQueuedSpinLock(&lock_handle);
}
/*
* Create REFLECT layer "pseudo" packet to pass the filter.
*/
static PWINDIVERT_IPHDR windivert_reflect_pseudo_packet(context_t context,
ULONG *len_ptr)
{
KLOCK_QUEUE_HANDLE lock_handle;
UINT16 total_len;
UINT8 *packet;
char *object;
const WINDIVERT_FILTER *filter;
UINT16 filter_len;
PWINDIVERT_IPHDR iphdr;
WINDIVERT_STREAM stream;
// The filter is returned in a pseudo-IP packet. This is just to make
// the interface consistent, i.e., WinDivertRecv() always receives IP
// packets.
packet = reflect_pseudo_packet;
iphdr = (PWINDIVERT_IPHDR)packet;
object = (char *)(iphdr + 1);
stream.data = object;
stream.pos = 0;
stream.max = sizeof(reflect_pseudo_packet) - sizeof(WINDIVERT_IPHDR);
stream.overflow = FALSE;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
filter = context->filter;
filter_len = context->filter_len;
KeReleaseInStackQueuedSpinLock(&lock_handle);
WinDivertSerializeFilter(&stream, filter, (UINT8)filter_len);
total_len = sizeof(WINDIVERT_IPHDR) + (UINT16)stream.pos;
RtlZeroMemory(iphdr, sizeof(WINDIVERT_IPHDR));
iphdr->Version = 4;
iphdr->HdrLength = sizeof(WINDIVERT_IPHDR) / sizeof(UINT32);
iphdr->Length = RtlUshortByteSwap(total_len);
iphdr->TTL = 1;
iphdr->Protocol = 254; // "experimental"
*len_ptr = total_len;
return iphdr;
}
/*
* Notify all REFLECT layer contexts a new event.
*/
static void windivert_reflect_event_notify(context_t context,
LONGLONG timestamp, WINDIVERT_EVENT event)
{
KLOCK_QUEUE_HANDLE lock_handle;
PLIST_ENTRY entry;
context_t waiter;
const WINDIVERT_FILTER *filter;
PWINDIVERT_IPHDR packet = NULL;
ULONG packet_len;
BOOL match;
entry = reflect_waiters.Flink;
while (entry != &reflect_waiters)
{
waiter = CONTAINING_RECORD(entry, struct context_s, reflect.entry);
entry = entry->Flink;
KeAcquireInStackQueuedSpinLock(&waiter->lock, &lock_handle);
filter = waiter->filter;
KeReleaseInStackQueuedSpinLock(&lock_handle);
match = windivert_filter(/*buffer=*/NULL,
/*layer=*/WINDIVERT_LAYER_REFLECT, (PVOID)&context->reflect.data,
timestamp, event, /*ipv4=*/TRUE, /*outbound=*/FALSE,
/*loopback=*/FALSE, /*impostor=*/FALSE, filter);
if (!match)
{
continue;
}
if (packet == NULL)
{
packet = windivert_reflect_pseudo_packet(context, &packet_len);
}
(VOID)windivert_queue_work(waiter, (PVOID)packet, packet_len,
/*buffers=*/NULL, /*layer=*/WINDIVERT_LAYER_REFLECT,
(PVOID)&context->reflect.data, event, /*flags=*/0, /*priority=*/0,
/*ipv4=*/TRUE, /*outbound=*/FALSE, /*loopback=*/FALSE,
/*impostor=*/FALSE, /*match=*/TRUE, timestamp);
}
}
/*
* Notify a new REFLECT layer context of all existing open handles.
*/
static void windivert_reflect_established_notify(context_t context,
LONGLONG timestamp)
{
KLOCK_QUEUE_HANDLE lock_handle;
PLIST_ENTRY entry;
BOOL match, ok;
context_t waiter;
const WINDIVERT_FILTER *filter;
PWINDIVERT_IPHDR packet;
ULONG packet_len;
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_OPEN)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
return;
}
filter = context->filter;
KeReleaseInStackQueuedSpinLock(&lock_handle);
entry = reflect_contexts.Flink;
while (entry != &reflect_contexts)
{
waiter = CONTAINING_RECORD(entry, struct context_s, reflect.entry);
entry = entry->Flink;
match = windivert_filter(/*buffer=*/NULL,
/*layer=*/WINDIVERT_LAYER_REFLECT, (PVOID)&waiter->reflect.data,
timestamp, /*event=*/WINDIVERT_EVENT_REFLECT_OPEN, /*ipv4=*/TRUE,
/*outbound=*/FALSE, /*loopback=*/FALSE, /*impostor=*/FALSE, filter);
if (!match)
{
continue;
}
packet = windivert_reflect_pseudo_packet(waiter, &packet_len);
ok = windivert_queue_work(context, (PVOID)packet, packet_len,
/*buffers=*/NULL, /*layer=*/WINDIVERT_LAYER_REFLECT,
(PVOID)&waiter->reflect.data,
/*event=*/WINDIVERT_EVENT_REFLECT_OPEN, /*flags=*/0,
/*priority=*/0, /*ipv4=*/TRUE, /*outbound=*/FALSE,
/*loopback=*/FALSE, /*impostor=*/FALSE, /*match=*/TRUE, timestamp);
if (!ok)
{
break;
}
}
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
if (context->state != WINDIVERT_CONTEXT_STATE_OPEN)
{
KeReleaseInStackQueuedSpinLock(&lock_handle);
return;
}
// REFLECT layer shutdown is disabled until all previously open handles
// have been queued.
context->shutdown_recv_enabled = TRUE;
KeReleaseInStackQueuedSpinLock(&lock_handle);
windivert_read_service(context);
}
/*
* WinDivert REFLECT worker.
*/
static void windivert_reflect_worker(IN WDFWORKITEM item)
{
KLOCK_QUEUE_HANDLE lock_handle;
PLIST_ENTRY entry;
context_t context;
LONGLONG timestamp;
WINDIVERT_EVENT event;
reflect_event_t reflect_event;
WDFOBJECT object;
WINDIVERT_LAYER layer;
// All reflection events are serialized and handled by this worker.
// This ensures that we are always operating on a consistent "snapshot"
// of the WinDivert handle state. This worker also has exclusive control
// over reflect_contexts/reflect_waiters, so locking is not required.
KeAcquireInStackQueuedSpinLock(&reflect_lock, &lock_handle);
while (!IsListEmpty(&reflect_event_queue))
{
entry = RemoveHeadList(&reflect_event_queue);
KeReleaseInStackQueuedSpinLock(&lock_handle);
reflect_event = CONTAINING_RECORD(entry, struct reflect_event_s, entry);
context = reflect_event->context;
event = reflect_event->event;
DEBUG("REFLECT: %s event for WinDivert context (context=%p)",
(event == WINDIVERT_EVENT_REFLECT_OPEN? "open": "close"), context);
KeAcquireInStackQueuedSpinLock(&context->lock, &lock_handle);
object = (WDFOBJECT)context->object;
layer = context->layer;
KeReleaseInStackQueuedSpinLock(&lock_handle);
timestamp = KeQueryPerformanceCounter(NULL).QuadPart;
switch (event)
{
case WINDIVERT_EVENT_REFLECT_OPEN:
if (layer != WINDIVERT_LAYER_REFLECT)
{
InsertTailList(&reflect_contexts, &context->reflect.entry);
}
else
{
InsertTailList(&reflect_waiters, &context->reflect.entry);
windivert_reflect_established_notify(context, timestamp);
}
break;
case WINDIVERT_EVENT_REFLECT_CLOSE:
RemoveEntryList(&context->reflect.entry);
break;
}
if (layer != WINDIVERT_LAYER_REFLECT)
{
windivert_reflect_event_notify(context, timestamp, event);
}
if (event == WINDIVERT_EVENT_REFLECT_CLOSE)
{
WdfObjectDereference(object);
}
KeAcquireInStackQueuedSpinLock(&reflect_lock, &lock_handle);
}
reflect_worker_queued = FALSE;
KeReleaseInStackQueuedSpinLock(&lock_handle);
}