qemu/hw/usb/canokey.c
MkfsSion 927b968d1b hw: canokey: Remove HS support as not compliant to the spec
Canokey core currently using 16 bytes as maximum packet size for
control endpoint, but to run the device in high-speed a 64 bytes
maximum packet size is required according to USB 2.0 specification.
Since we don't acutally need to run the device in high-speed, simply
don't assign high member in USBDesc.

When canokey-qemu is used with xhci, xhci would drive canokey
in high speed mode, since the bcdUSB in canokey-core is 2.1,
yet canokey-core set bMaxPacketSize0 to be 16, this is out
of the spec as the spec said that ``The allowable maximum
control transfer data payload sizes...for high-speed devices,
it is 64 bytes''.

In this case, usb device validation in Windows 10 LTSC 2021
as the guest would fail. It would complain
USB\DEVICE_DESCRIPTOR_VALIDATION_FAILURE.

Note that bcdUSB only identifies the spec version the device
complies, but it has no indication of its speed. So it is
allowed for the device to run in FS but comply the 2.1 spec.

To solve the issue we decided to just drop the high
speed support. This only affects usb-ehci as usb-ehci would
complain speed mismatch when FS device is attached to a HS port.
That's why the .high member was initialized in the first place.
Meanwhile, xhci is not affected as it works well with FS device.
Since everyone is now using xhci, it does no harm to most users.

Suggested-by: Hongren (Zenithal) Zheng <i@zenithal.me>
Signed-off-by: YuanYang Meng <mkfssion@mkfssion.com>
Reviewed-by: Hongren (Zenithal) Zheng <i@zenithal.me>
Message-Id: <20220625142138.19363-1-mkfssion@mkfssion.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2022-07-01 12:39:51 +02:00

335 lines
9.7 KiB
C

/*
* CanoKey QEMU device implementation.
*
* Copyright (c) 2021-2022 Canokeys.org <contact@canokeys.org>
* Written by Hongren (Zenithal) Zheng <i@zenithal.me>
*
* This code is licensed under the Apache-2.0.
*/
#include "qemu/osdep.h"
#include <canokey-qemu.h>
#include "qemu/module.h"
#include "qapi/error.h"
#include "hw/usb.h"
#include "hw/qdev-properties.h"
#include "trace.h"
#include "desc.h"
#include "canokey.h"
#define CANOKEY_EP_IN(ep) ((ep) & 0x7F)
#define CANOKEY_VENDOR_NUM 0x20a0
#define CANOKEY_PRODUCT_NUM 0x42d2
/*
* placeholder, canokey-qemu implements its own usb desc
* Namely we do not use usb_desc_handle_contorl
*/
enum {
STR_MANUFACTURER = 1,
STR_PRODUCT,
STR_SERIALNUMBER
};
static const USBDescStrings desc_strings = {
[STR_MANUFACTURER] = "canokeys.org",
[STR_PRODUCT] = "CanoKey QEMU",
[STR_SERIALNUMBER] = "0"
};
static const USBDescDevice desc_device_canokey = {
.bcdUSB = 0x0,
.bMaxPacketSize0 = 16,
.bNumConfigurations = 0,
.confs = NULL,
};
static const USBDesc desc_canokey = {
.id = {
.idVendor = CANOKEY_VENDOR_NUM,
.idProduct = CANOKEY_PRODUCT_NUM,
.bcdDevice = 0x0100,
.iManufacturer = STR_MANUFACTURER,
.iProduct = STR_PRODUCT,
.iSerialNumber = STR_SERIALNUMBER,
},
.full = &desc_device_canokey,
.str = desc_strings,
};
/*
* libcanokey-qemu.so side functions
* All functions are called from canokey_emu_device_loop
*/
int canokey_emu_stall_ep(void *base, uint8_t ep)
{
trace_canokey_emu_stall_ep(ep);
CanoKeyState *key = base;
uint8_t ep_in = CANOKEY_EP_IN(ep); /* INTR IN has ep 129 */
key->ep_in_size[ep_in] = 0;
key->ep_in_state[ep_in] = CANOKEY_EP_IN_STALL;
return 0;
}
int canokey_emu_set_address(void *base, uint8_t addr)
{
trace_canokey_emu_set_address(addr);
CanoKeyState *key = base;
key->dev.addr = addr;
return 0;
}
int canokey_emu_prepare_receive(
void *base, uint8_t ep, uint8_t *pbuf, uint16_t size)
{
trace_canokey_emu_prepare_receive(ep, size);
CanoKeyState *key = base;
key->ep_out[ep] = pbuf;
key->ep_out_size[ep] = size;
return 0;
}
int canokey_emu_transmit(
void *base, uint8_t ep, const uint8_t *pbuf, uint16_t size)
{
trace_canokey_emu_transmit(ep, size);
CanoKeyState *key = base;
uint8_t ep_in = CANOKEY_EP_IN(ep); /* INTR IN has ep 129 */
memcpy(key->ep_in[ep_in] + key->ep_in_size[ep_in],
pbuf, size);
key->ep_in_size[ep_in] += size;
key->ep_in_state[ep_in] = CANOKEY_EP_IN_READY;
/*
* wake up controller if we NAKed IN token before
* Note: this is a quirk for CanoKey CTAPHID
*/
if (ep_in == CANOKEY_EMU_EP_CTAPHID) {
usb_wakeup(usb_ep_get(&key->dev, USB_TOKEN_IN, ep_in), 0);
}
/*
* ready for more data in device loop
*
* Note: this is a quirk for CanoKey CTAPHID
* because it calls multiple emu_transmit in one device_loop
* but w/o data_in it would stuck in device_loop
* This has side effect for CCID since CCID can send ZLP
* This also has side effect for Control transfer
*/
if (ep_in == CANOKEY_EMU_EP_CTAPHID) {
canokey_emu_data_in(ep_in);
}
return 0;
}
uint32_t canokey_emu_get_rx_data_size(void *base, uint8_t ep)
{
CanoKeyState *key = base;
return key->ep_out_size[ep];
}
/*
* QEMU side functions
*/
static void canokey_handle_reset(USBDevice *dev)
{
trace_canokey_handle_reset();
CanoKeyState *key = CANOKEY(dev);
for (int i = 0; i != CANOKEY_EP_NUM; ++i) {
key->ep_in_state[i] = CANOKEY_EP_IN_WAIT;
key->ep_in_pos[i] = 0;
key->ep_in_size[i] = 0;
}
canokey_emu_reset();
}
static void canokey_handle_control(USBDevice *dev, USBPacket *p,
int request, int value, int index, int length, uint8_t *data)
{
trace_canokey_handle_control_setup(request, value, index, length);
CanoKeyState *key = CANOKEY(dev);
canokey_emu_setup(request, value, index, length);
uint32_t dir_in = request & DeviceRequest;
if (!dir_in) {
/* OUT */
trace_canokey_handle_control_out();
if (key->ep_out[0] != NULL) {
memcpy(key->ep_out[0], data, length);
}
canokey_emu_data_out(p->ep->nr, data);
}
canokey_emu_device_loop();
/* IN */
switch (key->ep_in_state[0]) {
case CANOKEY_EP_IN_WAIT:
p->status = USB_RET_NAK;
break;
case CANOKEY_EP_IN_STALL:
p->status = USB_RET_STALL;
break;
case CANOKEY_EP_IN_READY:
memcpy(data, key->ep_in[0], key->ep_in_size[0]);
p->actual_length = key->ep_in_size[0];
trace_canokey_handle_control_in(p->actual_length);
/* reset state */
key->ep_in_state[0] = CANOKEY_EP_IN_WAIT;
key->ep_in_size[0] = 0;
key->ep_in_pos[0] = 0;
break;
}
}
static void canokey_handle_data(USBDevice *dev, USBPacket *p)
{
CanoKeyState *key = CANOKEY(dev);
uint8_t ep_in = CANOKEY_EP_IN(p->ep->nr);
uint8_t ep_out = p->ep->nr;
uint32_t in_len;
uint32_t out_pos;
uint32_t out_len;
switch (p->pid) {
case USB_TOKEN_OUT:
trace_canokey_handle_data_out(ep_out, p->iov.size);
usb_packet_copy(p, key->ep_out_buffer[ep_out], p->iov.size);
out_pos = 0;
while (out_pos != p->iov.size) {
/*
* key->ep_out[ep_out] set by prepare_receive
* to be a buffer inside libcanokey-qemu.so
* key->ep_out_size[ep_out] set by prepare_receive
* to be the buffer length
*/
out_len = MIN(p->iov.size - out_pos, key->ep_out_size[ep_out]);
memcpy(key->ep_out[ep_out],
key->ep_out_buffer[ep_out] + out_pos, out_len);
out_pos += out_len;
/* update ep_out_size to actual len */
key->ep_out_size[ep_out] = out_len;
canokey_emu_data_out(ep_out, NULL);
}
/*
* Note: this is a quirk for CanoKey CTAPHID
*
* There is one code path that uses this device loop
* INTR IN -> useful data_in and useless device_loop -> NAKed
* INTR OUT -> useful device loop -> transmit -> wakeup
* (useful thanks to both data_in and data_out having been called)
* the next INTR IN -> actual data to guest
*
* if there is no such device loop, there would be no further
* INTR IN, no device loop, no transmit hence no usb_wakeup
* then qemu would hang
*/
if (ep_in == CANOKEY_EMU_EP_CTAPHID) {
canokey_emu_device_loop(); /* may call transmit multiple times */
}
break;
case USB_TOKEN_IN:
if (key->ep_in_pos[ep_in] == 0) { /* first time IN */
canokey_emu_data_in(ep_in);
canokey_emu_device_loop(); /* may call transmit multiple times */
}
switch (key->ep_in_state[ep_in]) {
case CANOKEY_EP_IN_WAIT:
/* NAK for early INTR IN */
p->status = USB_RET_NAK;
break;
case CANOKEY_EP_IN_STALL:
p->status = USB_RET_STALL;
break;
case CANOKEY_EP_IN_READY:
/* submit part of ep_in buffer to USBPacket */
in_len = MIN(key->ep_in_size[ep_in] - key->ep_in_pos[ep_in],
p->iov.size);
usb_packet_copy(p,
key->ep_in[ep_in] + key->ep_in_pos[ep_in], in_len);
key->ep_in_pos[ep_in] += in_len;
/* reset state if all data submitted */
if (key->ep_in_pos[ep_in] == key->ep_in_size[ep_in]) {
key->ep_in_state[ep_in] = CANOKEY_EP_IN_WAIT;
key->ep_in_size[ep_in] = 0;
key->ep_in_pos[ep_in] = 0;
}
trace_canokey_handle_data_in(ep_in, in_len);
break;
}
break;
default:
p->status = USB_RET_STALL;
break;
}
}
static void canokey_realize(USBDevice *base, Error **errp)
{
trace_canokey_realize();
CanoKeyState *key = CANOKEY(base);
if (key->file == NULL) {
error_setg(errp, "You must provide file=/path/to/canokey-file");
return;
}
usb_desc_init(base);
for (int i = 0; i != CANOKEY_EP_NUM; ++i) {
key->ep_in_state[i] = CANOKEY_EP_IN_WAIT;
key->ep_in_size[i] = 0;
key->ep_in_pos[i] = 0;
}
if (canokey_emu_init(key, key->file)) {
error_setg(errp, "canokey can not create or read %s", key->file);
return;
}
}
static void canokey_unrealize(USBDevice *base)
{
trace_canokey_unrealize();
}
static Property canokey_properties[] = {
DEFINE_PROP_STRING("file", CanoKeyState, file),
DEFINE_PROP_END_OF_LIST(),
};
static void canokey_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
uc->product_desc = "CanoKey QEMU";
uc->usb_desc = &desc_canokey;
uc->handle_reset = canokey_handle_reset;
uc->handle_control = canokey_handle_control;
uc->handle_data = canokey_handle_data;
uc->handle_attach = usb_desc_attach;
uc->realize = canokey_realize;
uc->unrealize = canokey_unrealize;
dc->desc = "CanoKey QEMU";
device_class_set_props(dc, canokey_properties);
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
}
static const TypeInfo canokey_info = {
.name = TYPE_CANOKEY,
.parent = TYPE_USB_DEVICE,
.instance_size = sizeof(CanoKeyState),
.class_init = canokey_class_init
};
static void canokey_register_types(void)
{
type_register_static(&canokey_info);
}
type_init(canokey_register_types)