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/*
* Copyright (C) 2003-2008 Takahiro Hirofuchi
* Copyright (C) 2015-2016 Nobuo Iwata
*
* This 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 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include <linux/kthread.h>
#include <linux/file.h>
#include <linux/net.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include "usbip_common.h"
#include "vhci.h"
/* TODO: refine locking ?*/
/* Sysfs entry to show port status */
static ssize_t status_show_vhci(int pdev_nr, char *out)
{
struct platform_device *pdev = *(vhci_pdevs + pdev_nr);
struct vhci_hcd *vhci;
char *s = out;
int i = 0;
unsigned long flags;
if (!pdev || !out) {
usbip_dbg_vhci_sysfs("show status error\n");
return 0;
}
vhci = hcd_to_vhci(platform_get_drvdata(pdev));
spin_lock_irqsave(&vhci->lock, flags);
/*
* output example:
* port sta spd dev socket local_busid
* 0000 004 000 00000000 c5a7bb80 1-2.3
* 0001 004 000 00000000 d8cee980 2-3.4
*
* IP address can be retrieved from a socket pointer address by looking
* up /proc/net/{tcp,tcp6}. Also, a userland program may remember a
* port number and its peer IP address.
*/
for (i = 0; i < VHCI_HC_PORTS; i++) {
struct vhci_device *vdev = &vhci->vdev[i];
spin_lock(&vdev->ud.lock);
out += sprintf(out, "%04u %03u ",
(pdev_nr * VHCI_HC_PORTS) + i,
vdev->ud.status);
if (vdev->ud.status == VDEV_ST_USED) {
out += sprintf(out, "%03u %08x ",
vdev->speed, vdev->devid);
out += sprintf(out, "%16p %s",
vdev->ud.tcp_socket,
dev_name(&vdev->udev->dev));
} else {
out += sprintf(out, "000 00000000 ");
out += sprintf(out, "0000000000000000 0-0");
}
out += sprintf(out, "\n");
spin_unlock(&vdev->ud.lock);
}
spin_unlock_irqrestore(&vhci->lock, flags);
return out - s;
}
static ssize_t status_show_not_ready(int pdev_nr, char *out)
{
char *s = out;
int i = 0;
for (i = 0; i < VHCI_HC_PORTS; i++) {
out += sprintf(out, "%04u %03u ",
(pdev_nr * VHCI_HC_PORTS) + i,
VDEV_ST_NOTASSIGNED);
out += sprintf(out, "000 00000000 0000000000000000 0-0");
out += sprintf(out, "\n");
}
return out - s;
}
static int status_name_to_id(const char *name)
{
char *c;
long val;
int ret;
c = strchr(name, '.');
if (c == NULL)
return 0;
ret = kstrtol(c+1, 10, &val);
if (ret < 0)
return ret;
return val;
}
static ssize_t status_show(struct device *dev,
struct device_attribute *attr, char *out)
{
char *s = out;
int pdev_nr;
out += sprintf(out,
"port sta spd dev socket local_busid\n");
pdev_nr = status_name_to_id(attr->attr.name);
if (pdev_nr < 0)
out += status_show_not_ready(pdev_nr, out);
else
out += status_show_vhci(pdev_nr, out);
return out - s;
}
static ssize_t nports_show(struct device *dev, struct device_attribute *attr,
char *out)
{
char *s = out;
out += sprintf(out, "%d\n", VHCI_HC_PORTS * vhci_num_controllers);
return out - s;
}
static DEVICE_ATTR_RO(nports);
/* Sysfs entry to shutdown a virtual connection */
static int vhci_port_disconnect(struct vhci_hcd *vhci, __u32 rhport)
{
struct vhci_device *vdev = &vhci->vdev[rhport];
unsigned long flags;
usbip_dbg_vhci_sysfs("enter\n");
/* lock */
spin_lock_irqsave(&vhci->lock, flags);
spin_lock(&vdev->ud.lock);
if (vdev->ud.status == VDEV_ST_NULL) {
pr_err("not connected %d\n", vdev->ud.status);
/* unlock */
spin_unlock(&vdev->ud.lock);
spin_unlock_irqrestore(&vhci->lock, flags);
return -EINVAL;
}
/* unlock */
spin_unlock(&vdev->ud.lock);
spin_unlock_irqrestore(&vhci->lock, flags);
usbip_event_add(&vdev->ud, VDEV_EVENT_DOWN);
return 0;
}
static int valid_port(__u32 pdev_nr, __u32 rhport)
{
if (pdev_nr >= vhci_num_controllers) {
pr_err("pdev %u\n", pdev_nr);
return 0;
}
if (rhport >= VHCI_HC_PORTS) {
pr_err("rhport %u\n", rhport);
return 0;
}
return 1;
}
static ssize_t store_detach(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
__u32 port = 0, pdev_nr = 0, rhport = 0;
struct usb_hcd *hcd;
int ret;
if (kstrtoint(buf, 10, &port) < 0)
return -EINVAL;
pdev_nr = port_to_pdev_nr(port);
rhport = port_to_rhport(port);
if (!valid_port(pdev_nr, rhport))
return -EINVAL;
hcd = platform_get_drvdata(*(vhci_pdevs + pdev_nr));
if (hcd == NULL) {
dev_err(dev, "port is not ready %u\n", port);
return -EAGAIN;
}
ret = vhci_port_disconnect(hcd_to_vhci(hcd), rhport);
if (ret < 0)
return -EINVAL;
usbip_dbg_vhci_sysfs("Leave\n");
return count;
}
static DEVICE_ATTR(detach, S_IWUSR, NULL, store_detach);
static int valid_args(__u32 pdev_nr, __u32 rhport, enum usb_device_speed speed)
{
if (!valid_port(pdev_nr, rhport)) {
return 0;
}
switch (speed) {
case USB_SPEED_LOW:
case USB_SPEED_FULL:
case USB_SPEED_HIGH:
case USB_SPEED_WIRELESS:
break;
default:
pr_err("Failed attach request for unsupported USB speed: %s\n",
usb_speed_string(speed));
return 0;
}
return 1;
}
/* Sysfs entry to establish a virtual connection */
/*
* To start a new USB/IP attachment, a userland program needs to setup a TCP
* connection and then write its socket descriptor with remote device
* information into this sysfs file.
*
* A remote device is virtually attached to the root-hub port of @rhport with
* @speed. @devid is embedded into a request to specify the remote device in a
* server host.
*
* write() returns 0 on success, else negative errno.
*/
static ssize_t store_attach(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct socket *socket;
int sockfd = 0;
__u32 port = 0, pdev_nr = 0, rhport = 0, devid = 0, speed = 0;
struct usb_hcd *hcd;
struct vhci_hcd *vhci;
struct vhci_device *vdev;
int err;
unsigned long flags;
/*
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