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Use more specific IOCTL code

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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2019-07-19 06:29:33 +00:00
parent 6ebdbf77d2
commit 970e22d8e4
2 changed files with 2 additions and 3 deletions
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2
README.md
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@ -148,7 +148,7 @@ typedef struct _TUN_REGISTER_RINGS
- `Receive.TailMoved`: A handle to an [`auto-reset event`](https://docs.microsoft.com/en-us/windows/win32/api/synchapi/nf-synchapi-createeventa) created by the client that the client will signal when it changes `Receive.Ring->Tail` and `Receive.Ring->Alertable` is non-zero.
With events created, send and receive rings allocated, and registration struct populated, [`DeviceIoControl`](https://docs.microsoft.com/en-us/windows/win32/api/ioapiset/nf-ioapiset-deviceiocontrol)(`TUN_IOCTL_REGISTER_RINGS`: 0x22E000) with pointer and size of descriptor struct specified as `lpInBuffer` and `nInBufferSize` parameters. You may call `TUN_IOCTL_REGISTER_RINGS` on one handle only.
With events created, send and receive rings allocated, and registration struct populated, [`DeviceIoControl`](https://docs.microsoft.com/en-us/windows/win32/api/ioapiset/nf-ioapiset-deviceiocontrol)(`TUN_IOCTL_REGISTER_RINGS`: 0xca6ce5c0) with pointer and size of descriptor struct specified as `lpInBuffer` and `nInBufferSize` parameters. You may call `TUN_IOCTL_REGISTER_RINGS` on one handle only.
### Writing to and from rings

3
wintun.c
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@ -101,8 +101,7 @@ typedef struct _TUN_REGISTER_RINGS
/* Register rings hosted by the client
* The lpInBuffer and nInBufferSize parameters of DeviceIoControl() must point to an TUN_REGISTER_RINGS struct.
* Client must wait for this IOCTL to finish before adding packets to the ring. */
#define TUN_IOCTL_REGISTER_RINGS CTL_CODE(FILE_DEVICE_UNKNOWN, 0x800, METHOD_BUFFERED, FILE_READ_DATA | FILE_WRITE_DATA)
/* TODO: Select and specify OEM-specific device type instead of FILE_DEVICE_UNKNOWN. */
#define TUN_IOCTL_REGISTER_RINGS CTL_CODE(51820, 0x970, METHOD_BUFFERED, FILE_READ_DATA | FILE_WRITE_DATA)
typedef enum _TUN_FLAGS
{