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qemu/hw/usb/desc.c
Gerd Hoffmann 9d55d1adc8 usb: add serial number generator 
This patch adds a function which creates unique serial numbers for usb
devices and puts it into use.  Windows guests tend to become unhappy if
they find two identical usb devices in the system.  Effects range from
non-functional devices (with yellow exclamation mark in device manager)
to BSODs.  Handing out unique serial numbers to devices fixes this.

With this patch applied almost all emulated devices get a generated,
unique serial number.  There are two exceptions:

 * usb-storage devices will prefer a user-specified serial number
   and will only get a generated number in case the serial property
   is unset.
 * usb-hid devices keep the fixed serial number "42" as it is used
   to signal "remote wakeup actually works".
   See commit 7b074a22da

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2012-04-26 12:21:17 +02:00

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#include <ctype.h>
#include "hw/usb.h"
#include "hw/usb/desc.h"
#include "trace.h"
/* ------------------------------------------------------------------ */
static uint8_t usb_lo(uint16_t val)
{
return val & 0xff;
}
static uint8_t usb_hi(uint16_t val)
{
return (val >> 8) & 0xff;
}
int usb_desc_device(const USBDescID *id, const USBDescDevice *dev,
uint8_t *dest, size_t len)
{
uint8_t bLength = 0x12;
USBDescriptor *d = (void *)dest;
if (len < bLength) {
return -1;
}
d->bLength = bLength;
d->bDescriptorType = USB_DT_DEVICE;
d->u.device.bcdUSB_lo = usb_lo(dev->bcdUSB);
d->u.device.bcdUSB_hi = usb_hi(dev->bcdUSB);
d->u.device.bDeviceClass = dev->bDeviceClass;
d->u.device.bDeviceSubClass = dev->bDeviceSubClass;
d->u.device.bDeviceProtocol = dev->bDeviceProtocol;
d->u.device.bMaxPacketSize0 = dev->bMaxPacketSize0;
d->u.device.idVendor_lo = usb_lo(id->idVendor);
d->u.device.idVendor_hi = usb_hi(id->idVendor);
d->u.device.idProduct_lo = usb_lo(id->idProduct);
d->u.device.idProduct_hi = usb_hi(id->idProduct);
d->u.device.bcdDevice_lo = usb_lo(id->bcdDevice);
d->u.device.bcdDevice_hi = usb_hi(id->bcdDevice);
d->u.device.iManufacturer = id->iManufacturer;
d->u.device.iProduct = id->iProduct;
d->u.device.iSerialNumber = id->iSerialNumber;
d->u.device.bNumConfigurations = dev->bNumConfigurations;
return bLength;
}
int usb_desc_device_qualifier(const USBDescDevice *dev,
uint8_t *dest, size_t len)
{
uint8_t bLength = 0x0a;
USBDescriptor *d = (void *)dest;
if (len < bLength) {
return -1;
}
d->bLength = bLength;
d->bDescriptorType = USB_DT_DEVICE_QUALIFIER;
d->u.device_qualifier.bcdUSB_lo = usb_lo(dev->bcdUSB);
d->u.device_qualifier.bcdUSB_hi = usb_hi(dev->bcdUSB);
d->u.device_qualifier.bDeviceClass = dev->bDeviceClass;
d->u.device_qualifier.bDeviceSubClass = dev->bDeviceSubClass;
d->u.device_qualifier.bDeviceProtocol = dev->bDeviceProtocol;
d->u.device_qualifier.bMaxPacketSize0 = dev->bMaxPacketSize0;
d->u.device_qualifier.bNumConfigurations = dev->bNumConfigurations;
d->u.device_qualifier.bReserved = 0;
return bLength;
}
int usb_desc_config(const USBDescConfig *conf, uint8_t *dest, size_t len)
{
uint8_t bLength = 0x09;
uint16_t wTotalLength = 0;
USBDescriptor *d = (void *)dest;
int i, rc;
if (len < bLength) {
return -1;
}
d->bLength = bLength;
d->bDescriptorType = USB_DT_CONFIG;
d->u.config.bNumInterfaces = conf->bNumInterfaces;
d->u.config.bConfigurationValue = conf->bConfigurationValue;
d->u.config.iConfiguration = conf->iConfiguration;
d->u.config.bmAttributes = conf->bmAttributes;
d->u.config.bMaxPower = conf->bMaxPower;
wTotalLength += bLength;
/* handle grouped interfaces if any */
for (i = 0; i < conf->nif_groups; i++) {
rc = usb_desc_iface_group(&(conf->if_groups[i]),
dest + wTotalLength,
len - wTotalLength);
if (rc < 0) {
return rc;
}
wTotalLength += rc;
}
/* handle normal (ungrouped / no IAD) interfaces if any */
for (i = 0; i < conf->nif; i++) {
rc = usb_desc_iface(conf->ifs + i, dest + wTotalLength, len - wTotalLength);
if (rc < 0) {
return rc;
}
wTotalLength += rc;
}
d->u.config.wTotalLength_lo = usb_lo(wTotalLength);
d->u.config.wTotalLength_hi = usb_hi(wTotalLength);
return wTotalLength;
}
int usb_desc_iface_group(const USBDescIfaceAssoc *iad, uint8_t *dest,
size_t len)
{
int pos = 0;
int i = 0;
/* handle interface association descriptor */
uint8_t bLength = 0x08;
if (len < bLength) {
return -1;
}
dest[0x00] = bLength;
dest[0x01] = USB_DT_INTERFACE_ASSOC;
dest[0x02] = iad->bFirstInterface;
dest[0x03] = iad->bInterfaceCount;
dest[0x04] = iad->bFunctionClass;
dest[0x05] = iad->bFunctionSubClass;
dest[0x06] = iad->bFunctionProtocol;
dest[0x07] = iad->iFunction;
pos += bLength;
/* handle associated interfaces in this group */
for (i = 0; i < iad->nif; i++) {
int rc = usb_desc_iface(&(iad->ifs[i]), dest + pos, len - pos);
if (rc < 0) {
return rc;
}
pos += rc;
}
return pos;
}
int usb_desc_iface(const USBDescIface *iface, uint8_t *dest, size_t len)
{
uint8_t bLength = 0x09;
int i, rc, pos = 0;
USBDescriptor *d = (void *)dest;
if (len < bLength) {
return -1;
}
d->bLength = bLength;
d->bDescriptorType = USB_DT_INTERFACE;
d->u.interface.bInterfaceNumber = iface->bInterfaceNumber;
d->u.interface.bAlternateSetting = iface->bAlternateSetting;
d->u.interface.bNumEndpoints = iface->bNumEndpoints;
d->u.interface.bInterfaceClass = iface->bInterfaceClass;
d->u.interface.bInterfaceSubClass = iface->bInterfaceSubClass;
d->u.interface.bInterfaceProtocol = iface->bInterfaceProtocol;
d->u.interface.iInterface = iface->iInterface;
pos += bLength;
for (i = 0; i < iface->ndesc; i++) {
rc = usb_desc_other(iface->descs + i, dest + pos, len - pos);
if (rc < 0) {
return rc;
}
pos += rc;
}
for (i = 0; i < iface->bNumEndpoints; i++) {
rc = usb_desc_endpoint(iface->eps + i, dest + pos, len - pos);
if (rc < 0) {
return rc;
}
pos += rc;
}
return pos;
}
int usb_desc_endpoint(const USBDescEndpoint *ep, uint8_t *dest, size_t len)
{
uint8_t bLength = ep->is_audio ? 0x09 : 0x07;
uint8_t extralen = ep->extra ? ep->extra[0] : 0;
USBDescriptor *d = (void *)dest;
if (len < bLength + extralen) {
return -1;
}
d->bLength = bLength;
d->bDescriptorType = USB_DT_ENDPOINT;
d->u.endpoint.bEndpointAddress = ep->bEndpointAddress;
d->u.endpoint.bmAttributes = ep->bmAttributes;
d->u.endpoint.wMaxPacketSize_lo = usb_lo(ep->wMaxPacketSize);
d->u.endpoint.wMaxPacketSize_hi = usb_hi(ep->wMaxPacketSize);
d->u.endpoint.bInterval = ep->bInterval;
if (ep->is_audio) {
d->u.endpoint.bRefresh = ep->bRefresh;
d->u.endpoint.bSynchAddress = ep->bSynchAddress;
}
if (ep->extra) {
memcpy(dest + bLength, ep->extra, extralen);
}
return bLength + extralen;
}
int usb_desc_other(const USBDescOther *desc, uint8_t *dest, size_t len)
{
int bLength = desc->length ? desc->length : desc->data[0];
if (len < bLength) {
return -1;
}
memcpy(dest, desc->data, bLength);
return bLength;
}
/* ------------------------------------------------------------------ */
static void usb_desc_ep_init(USBDevice *dev)
{
const USBDescIface *iface;
int i, e, pid, ep;
usb_ep_init(dev);
for (i = 0; i < dev->ninterfaces; i++) {
iface = dev->ifaces[i];
if (iface == NULL) {
continue;
}
for (e = 0; e < iface->bNumEndpoints; e++) {
pid = (iface->eps[e].bEndpointAddress & USB_DIR_IN) ?
USB_TOKEN_IN : USB_TOKEN_OUT;
ep = iface->eps[e].bEndpointAddress & 0x0f;
usb_ep_set_type(dev, pid, ep, iface->eps[e].bmAttributes & 0x03);
usb_ep_set_ifnum(dev, pid, ep, iface->bInterfaceNumber);
usb_ep_set_max_packet_size(dev, pid, ep,
iface->eps[e].wMaxPacketSize);
}
}
}
static const USBDescIface *usb_desc_find_interface(USBDevice *dev,
int nif, int alt)
{
const USBDescIface *iface;
int g, i;
if (!dev->config) {
return NULL;
}
for (g = 0; g < dev->config->nif_groups; g++) {
for (i = 0; i < dev->config->if_groups[g].nif; i++) {
iface = &dev->config->if_groups[g].ifs[i];
if (iface->bInterfaceNumber == nif &&
iface->bAlternateSetting == alt) {
return iface;
}
}
}
for (i = 0; i < dev->config->nif; i++) {
iface = &dev->config->ifs[i];
if (iface->bInterfaceNumber == nif &&
iface->bAlternateSetting == alt) {
return iface;
}
}
return NULL;
}
static int usb_desc_set_interface(USBDevice *dev, int index, int value)
{
const USBDescIface *iface;
int old;
iface = usb_desc_find_interface(dev, index, value);
if (iface == NULL) {
return -1;
}
old = dev->altsetting[index];
dev->altsetting[index] = value;
dev->ifaces[index] = iface;
usb_desc_ep_init(dev);
if (old != value) {
usb_device_set_interface(dev, index, old, value);
}
return 0;
}
static int usb_desc_set_config(USBDevice *dev, int value)
{
int i;
if (value == 0) {
dev->configuration = 0;
dev->ninterfaces = 0;
dev->config = NULL;
} else {
for (i = 0; i < dev->device->bNumConfigurations; i++) {
if (dev->device->confs[i].bConfigurationValue == value) {
dev->configuration = value;
dev->ninterfaces = dev->device->confs[i].bNumInterfaces;
dev->config = dev->device->confs + i;
assert(dev->ninterfaces <= USB_MAX_INTERFACES);
}
}
if (i < dev->device->bNumConfigurations) {
return -1;
}
}
for (i = 0; i < dev->ninterfaces; i++) {
usb_desc_set_interface(dev, i, 0);
}
for (; i < USB_MAX_INTERFACES; i++) {
dev->altsetting[i] = 0;
dev->ifaces[i] = NULL;
}
return 0;
}
static void usb_desc_setdefaults(USBDevice *dev)
{
const USBDesc *desc = usb_device_get_usb_desc(dev);
assert(desc != NULL);
switch (dev->speed) {
case USB_SPEED_LOW:
case USB_SPEED_FULL:
dev->device = desc->full;
break;
case USB_SPEED_HIGH:
dev->device = desc->high;
break;
}
usb_desc_set_config(dev, 0);
}
void usb_desc_init(USBDevice *dev)
{
const USBDesc *desc = usb_device_get_usb_desc(dev);
assert(desc != NULL);
dev->speed = USB_SPEED_FULL;
dev->speedmask = 0;
if (desc->full) {
dev->speedmask |= USB_SPEED_MASK_FULL;
}
if (desc->high) {
dev->speedmask |= USB_SPEED_MASK_HIGH;
}
usb_desc_setdefaults(dev);
}
void usb_desc_attach(USBDevice *dev)
{
const USBDesc *desc = usb_device_get_usb_desc(dev);
assert(desc != NULL);
if (desc->high && (dev->port->speedmask & USB_SPEED_MASK_HIGH)) {
dev->speed = USB_SPEED_HIGH;
} else if (desc->full && (dev->port->speedmask & USB_SPEED_MASK_FULL)) {
dev->speed = USB_SPEED_FULL;
} else {
fprintf(stderr, "usb: port/device speed mismatch for \"%s\"\n",
usb_device_get_product_desc(dev));
return;
}
usb_desc_setdefaults(dev);
}
void usb_desc_set_string(USBDevice *dev, uint8_t index, const char *str)
{
USBDescString *s;
QLIST_FOREACH(s, &dev->strings, next) {
if (s->index == index) {
break;
}
}
if (s == NULL) {
s = g_malloc0(sizeof(*s));
s->index = index;
QLIST_INSERT_HEAD(&dev->strings, s, next);
}
g_free(s->str);
s->str = g_strdup(str);
}
/*
* This function creates a serial number for a usb device.
* The serial number should:
* (a) Be unique within the virtual machine.
* (b) Be constant, so you don't get a new one each
* time the guest is started.
* So we are using the physical location to generate a serial number
* from it. It has three pieces: First a fixed, device-specific
* prefix. Second the device path of the host controller (which is
* the pci address in most cases). Third the physical port path.
* Results in serial numbers like this: "314159-0000:00:1d.7-3".
*/
void usb_desc_create_serial(USBDevice *dev)
{
DeviceState *hcd = dev->qdev.parent_bus->parent;
const USBDesc *desc = usb_device_get_usb_desc(dev);
int index = desc->id.iSerialNumber;
char serial[64];
int dst;
assert(index != 0 && desc->str[index] != NULL);
dst = snprintf(serial, sizeof(serial), "%s", desc->str[index]);
if (hcd && hcd->parent_bus && hcd->parent_bus->info->get_dev_path) {
char *path = hcd->parent_bus->info->get_dev_path(hcd);
dst += snprintf(serial+dst, sizeof(serial)-dst, "-%s", path);
}
dst += snprintf(serial+dst, sizeof(serial)-dst, "-%s", dev->port->path);
usb_desc_set_string(dev, index, serial);
}
const char *usb_desc_get_string(USBDevice *dev, uint8_t index)
{
USBDescString *s;
QLIST_FOREACH(s, &dev->strings, next) {
if (s->index == index) {
return s->str;
}
}
return NULL;
}
int usb_desc_string(USBDevice *dev, int index, uint8_t *dest, size_t len)
{
uint8_t bLength, pos, i;
const char *str;
if (len < 4) {
return -1;
}
if (index == 0) {
/* language ids */
dest[0] = 4;
dest[1] = USB_DT_STRING;
dest[2] = 0x09;
dest[3] = 0x04;
return 4;
}
str = usb_desc_get_string(dev, index);
if (str == NULL) {
str = usb_device_get_usb_desc(dev)->str[index];
if (str == NULL) {
return 0;
}
}
bLength = strlen(str) * 2 + 2;
dest[0] = bLength;
dest[1] = USB_DT_STRING;
i = 0; pos = 2;
while (pos+1 < bLength && pos+1 < len) {
dest[pos++] = str[i++];
dest[pos++] = 0;
}
return pos;
}
int usb_desc_get_descriptor(USBDevice *dev, int value, uint8_t *dest, size_t len)
{
const USBDesc *desc = usb_device_get_usb_desc(dev);
const USBDescDevice *other_dev;
uint8_t buf[256];
uint8_t type = value >> 8;
uint8_t index = value & 0xff;
int ret = -1;
if (dev->speed == USB_SPEED_HIGH) {
other_dev = usb_device_get_usb_desc(dev)->full;
} else {
other_dev = usb_device_get_usb_desc(dev)->high;
}
switch(type) {
case USB_DT_DEVICE:
ret = usb_desc_device(&desc->id, dev->device, buf, sizeof(buf));
trace_usb_desc_device(dev->addr, len, ret);
break;
case USB_DT_CONFIG:
if (index < dev->device->bNumConfigurations) {
ret = usb_desc_config(dev->device->confs + index, buf, sizeof(buf));
}
trace_usb_desc_config(dev->addr, index, len, ret);
break;
case USB_DT_STRING:
ret = usb_desc_string(dev, index, buf, sizeof(buf));
trace_usb_desc_string(dev->addr, index, len, ret);
break;
case USB_DT_DEVICE_QUALIFIER:
if (other_dev != NULL) {
ret = usb_desc_device_qualifier(other_dev, buf, sizeof(buf));
}
trace_usb_desc_device_qualifier(dev->addr, len, ret);
break;
case USB_DT_OTHER_SPEED_CONFIG:
if (other_dev != NULL && index < other_dev->bNumConfigurations) {
ret = usb_desc_config(other_dev->confs + index, buf, sizeof(buf));
buf[0x01] = USB_DT_OTHER_SPEED_CONFIG;
}
trace_usb_desc_other_speed_config(dev->addr, index, len, ret);
break;
case USB_DT_DEBUG:
/* ignore silently */
break;
default:
fprintf(stderr, "%s: %d unknown type %d (len %zd)\n", __FUNCTION__,
dev->addr, type, len);
break;
}
if (ret > 0) {
if (ret > len) {
ret = len;
}
memcpy(dest, buf, ret);
}
return ret;
}
int usb_desc_handle_control(USBDevice *dev, USBPacket *p,
int request, int value, int index, int length, uint8_t *data)
{
const USBDesc *desc = usb_device_get_usb_desc(dev);
int ret = -1;
assert(desc != NULL);
switch(request) {
case DeviceOutRequest | USB_REQ_SET_ADDRESS:
dev->addr = value;
trace_usb_set_addr(dev->addr);
ret = 0;
break;
case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
ret = usb_desc_get_descriptor(dev, value, data, length);
break;
case DeviceRequest | USB_REQ_GET_CONFIGURATION:
/*
* 9.4.2: 0 should be returned if the device is unconfigured, otherwise
* the non zero value of bConfigurationValue.
*/
data[0] = dev->config ? dev->config->bConfigurationValue : 0;
ret = 1;
break;
case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
ret = usb_desc_set_config(dev, value);
trace_usb_set_config(dev->addr, value, ret);
break;
case DeviceRequest | USB_REQ_GET_STATUS: {
const USBDescConfig *config = dev->config ?
dev->config : &dev->device->confs[0];
data[0] = 0;
/*
* Default state: Device behavior when this request is received while
* the device is in the Default state is not specified.
* We return the same value that a configured device would return if
* it used the first configuration.
*/
if (config->bmAttributes & 0x40) {
data[0] |= 1 << USB_DEVICE_SELF_POWERED;
}
if (dev->remote_wakeup) {
data[0] |= 1 << USB_DEVICE_REMOTE_WAKEUP;
}
data[1] = 0x00;
ret = 2;
break;
}
case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
if (value == USB_DEVICE_REMOTE_WAKEUP) {
dev->remote_wakeup = 0;
ret = 0;
}
trace_usb_clear_device_feature(dev->addr, value, ret);
break;
case DeviceOutRequest | USB_REQ_SET_FEATURE:
if (value == USB_DEVICE_REMOTE_WAKEUP) {
dev->remote_wakeup = 1;
ret = 0;
}
trace_usb_set_device_feature(dev->addr, value, ret);
break;
case InterfaceRequest | USB_REQ_GET_INTERFACE:
if (index < 0 || index >= dev->ninterfaces) {
break;
}
data[0] = dev->altsetting[index];
ret = 1;
break;
case InterfaceOutRequest | USB_REQ_SET_INTERFACE:
ret = usb_desc_set_interface(dev, index, value);
trace_usb_set_interface(dev->addr, index, value, ret);
break;
}
return ret;
}
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