This patch adds the possibility to stored ACLs for allowed clients for
each stub device in sysfs. It adds a new sysfs entry called "usbip_acl"
for each stub device, containing a list of CIDR masks of allowed
clients. This file will be used by usbip and usbipd to store the ACL.
Signed-off-by: Kurt Kanzenbach <ly80toro@xxxxxxxxxxxxx>
Signed-off-by: Dominik Paulus <dominik.paulus@xxxxxx>
Signed-off-by: Tobias Polzer <tobias.polzer@xxxxxx>
---
drivers/staging/usbip/stub.h | 5 +++
drivers/staging/usbip/stub_dev.c | 68 +++++++++++++++++++++++++++++++++++++++-
2 files changed, 72 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/usbip/stub.h b/drivers/staging/usbip/stub.h
index a73e437..cfe75d1 100644
--- a/drivers/staging/usbip/stub.h
+++ b/drivers/staging/usbip/stub.h
@@ -60,6 +60,11 @@ struct stub_device {
struct list_head unlink_free;
wait_queue_head_t tx_waitq;
+
+ /* list of allowed IP addrs */
+ char *acls;
+ /* for locking list operations */
+ spinlock_t ip_lock;
};
/* private data into urb->priv */
diff --git a/drivers/staging/usbip/stub_dev.c b/drivers/staging/usbip/stub_dev.c
index 76a1ff0..3939b60 100644
--- a/drivers/staging/usbip/stub_dev.c
+++ b/drivers/staging/usbip/stub_dev.c
@@ -142,6 +142,62 @@ err:
}
static DEVICE_ATTR(usbip_sockfd, S_IWUSR, NULL, store_sockfd);
+/*
+ * This function replaces the current ACL list
+ */
+static ssize_t store_acl(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct stub_device *sdev = dev_get_drvdata(dev);
+ int retval = 0;
+
+ if (!sdev)
+ return -ENODEV;
+
+ if (count >= PAGE_SIZE)
+ /* Prevent storing oversized ACLs in kernel memory */
+ return -EINVAL;
+
+ /* Store ACL */
+ spin_lock_irq(&sdev->ip_lock);
+ kfree(sdev->acls);
+ sdev->acls = kstrdup(buf, GFP_KERNEL);
+ if (IS_ERR(sdev->acls)) {
+ retval = PTR_ERR(sdev->acls);
+ sdev->acls = NULL;
+ } else {
+ retval = strlen(sdev->acls);
+ }
+ spin_unlock_irq(&sdev->ip_lock);
+
+ return retval;
+}
+
+/*
+ * This functions prints all allowed IP addrs for this dev
+ */
+static ssize_t show_acl(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct stub_device *sdev = dev_get_drvdata(dev);
+ int retval = 0;
+
+ if (!sdev)
+ return -ENODEV;
+
+ spin_lock_irq(&sdev->ip_lock);
+ if (sdev->acls == NULL) {
+ retval = 0;
+ } else {
+ strcpy(buf, sdev->acls);
+ retval = strlen(buf);
+ }
+ spin_unlock_irq(&sdev->ip_lock);
+
+ return retval;
+}
+static DEVICE_ATTR(usbip_acl, S_IWUSR | S_IRUGO, show_acl, store_acl);
+
static int stub_add_files(struct device *dev)
{
int err = 0;
@@ -157,9 +213,13 @@ static int stub_add_files(struct device *dev)
err = device_create_file(dev, &dev_attr_usbip_debug);
if (err)
goto err_debug;
+ err = device_create_file(dev, &dev_attr_usbip_acl);
+ if (err)
+ goto err_ip;
return 0;
-
+err_ip:
+ device_remove_file(dev, &dev_attr_usbip_debug);
err_debug:
device_remove_file(dev, &dev_attr_usbip_sockfd);
err_sockfd:
@@ -173,6 +233,7 @@ static void stub_remove_files(struct device *dev)
device_remove_file(dev, &dev_attr_usbip_status);
device_remove_file(dev, &dev_attr_usbip_sockfd);
device_remove_file(dev, &dev_attr_usbip_debug);
+ device_remove_file(dev, &dev_attr_usbip_acl);
}
static void stub_shutdown_connection(struct usbip_device *ud)
@@ -306,12 +367,14 @@ static struct stub_device *stub_device_alloc(struct usb_device *udev,
sdev->ud.status = SDEV_ST_AVAILABLE;
spin_lock_init(&sdev->ud.lock);
sdev->ud.tcp_socket = NULL;
+ sdev->acls = NULL;
INIT_LIST_HEAD(&sdev->priv_init);
INIT_LIST_HEAD(&sdev->priv_tx);
INIT_LIST_HEAD(&sdev->priv_free);
INIT_LIST_HEAD(&sdev->unlink_free);
INIT_LIST_HEAD(&sdev->unlink_tx);
+ spin_lock_init(&sdev->ip_lock);
spin_lock_init(&sdev->priv_lock);
init_waitqueue_head(&sdev->tx_waitq);
@@ -511,6 +574,9 @@ static void stub_disconnect(struct usb_interface *interface)
usb_put_dev(sdev->udev);
usb_put_intf(interface);
+ /* free ACL list */
+ kfree(sdev->acls);
+
/* free sdev */
busid_priv->sdev = NULL;
stub_device_free(sdev);
--
1.8.4
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