/* * Copyright (C) 2003-2008 Takahiro Hirofuchi * * 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 #include #include #include "usbip_common.h" #include "vhci.h" /* TODO: refine locking ?*/ /* Sysfs entry to show port status */ static ssize_t status_show(struct device *dev, struct device_attribute *attr, char *out) { char *s = out; int i = 0; BUG_ON(!the_controller || !out); spin_lock(&the_controller->lock); /* * output example: * port sta spd dev sockfd local_busid * 0000 004 000 00000000 000003 1-2.3 * 0001 004 000 00000000 000004 2-3.4 * * Output includes socket fd instead of socket pointer address to * avoid leaking kernel memory address in: * /sys/devices/platform/vhci_hcd.0/status and in debug output. * The socket pointer address is not used at the moment and it was * made visible as a convenient way to find IP address from socket * pointer address by looking up /proc/net/{tcp,tcp6}. As this opens * a security hole, the change is made to use sockfd instead. */ out += sprintf(out, "prt sta spd bus dev sockfd local_busid\n"); for (i = 0; i < VHCI_NPORTS; i++) { struct vhci_device *vdev = port_to_vdev(i); spin_lock(&vdev->ud.lock); out += sprintf(out, "%03u %03u ", i, vdev->ud.status); if (vdev->ud.status == VDEV_ST_USED) { out += sprintf(out, "%03u %08x ", vdev->speed, vdev->devid); out += sprintf(out, "%16p ", vdev->ud.tcp_socket); out += sprintf(out, "%06u", vdev->ud.sockfd); out += sprintf(out, "%s", dev_name(&vdev->udev->dev)); } else out += sprintf(out, "000 000 000 000000 0-0"); out += sprintf(out, "\n"); spin_unlock(&vdev->ud.lock); } spin_unlock(&the_controller->lock); return out - s; } static DEVICE_ATTR_RO(status); /* Sysfs entry to shutdown a virtual connection */ static int vhci_port_disconnect(__u32 rhport) { struct vhci_device *vdev; usbip_dbg_vhci_sysfs("enter\n"); /* lock */ spin_lock(&the_controller->lock); vdev = port_to_vdev(rhport); 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(&the_controller->lock); return -EINVAL; } /* unlock */ spin_unlock(&vdev->ud.lock); spin_unlock(&the_controller->lock); usbip_event_add(&vdev->ud, VDEV_EVENT_DOWN); return 0; } static ssize_t store_detach(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { int err; __u32 rhport = 0; if (sscanf(buf, "%u", &rhport) != 1) return -EINVAL; /* check rhport */ if (rhport >= VHCI_NPORTS) { dev_err(dev, "invalid port %u\n", rhport); return -EINVAL; } err = vhci_port_disconnect(rhport); if (err < 0) return -EINVAL; usbip_dbg_vhci_sysfs("Leave\n"); return count; } static DEVICE_ATTR(detach, S_IWUSR, NULL, store_detach); /* Sysfs entry to establish a virtual connection */ static int valid_args(__u32 rhport, enum usb_device_speed speed) { /* check rhport */ if (rhport >= VHCI_NPORTS) { pr_err("port %u\n", rhport); return -EINVAL; } /* check speed */ 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 -EINVAL; } return 0; } /* * 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 vhci_device *vdev; struct socket *socket; int sockfd = 0; __u32 rhport = 0, devid = 0, speed = 0; int err; /* * @rhport: port number of vhci_hcd * @sockfd: socket descriptor of an established TCP connection * @devid: unique device identifier in a remote host * @speed: usb device speed in a remote host */ if (sscanf(buf, "%u %u %u %u", &rhport, &sockfd, &devid, &speed) != 4) return -EINVAL; usbip_dbg_vhci_sysfs("rhport(%u) sockfd(%u) devid(%u) speed(%u)\n", rhport, sockfd, devid, speed); /* check received parameters */ if (valid_args(rhport, speed) < 0) return -EINVAL; /* Extract socket from fd. */ socket = sockfd_lookup(sockfd, &err); if (!socket) return -EINVAL; /* now need lock until setting vdev status as used */ /* begin a lock */ spin_lock(&the_controller->lock); vdev = port_to_vdev(rhport); spin_lock(&vdev->ud.lock); if (vdev->ud.status != VDEV_ST_NULL) { /* end of the lock */ spin_unlock(&vdev->ud.lock); spin_unlock(&the_controller->lock); sockfd_put(socket); dev_err(dev, "port %d already used\n", rhport); return -EINVAL; } dev_info(dev, "rhport(%u) sockfd(%d) devid(%u) speed(%u) speed_str(%s)\n", rhport, sockfd, devid, speed, usb_speed_string(speed)); vdev->devid = devid; vdev->speed = speed; vdev->ud.sockfd = sockfd; vdev->ud.tcp_socket = socket; vdev->ud.status = VDEV_ST_NOTASSIGNED; spin_unlock(&vdev->ud.lock); spin_unlock(&the_controller->lock); /* end the lock */ vdev->ud.tcp_rx = kthread_get_run(vhci_rx_loop, &vdev->ud, "vhci_rx"); vdev->ud.tcp_tx = kthread_get_run(vhci_tx_loop, &vdev->ud, "vhci_tx"); rh_port_connect(rhport, speed); return count; } static DEVICE_ATTR(attach, S_IWUSR, NULL, store_attach); static struct attribute *dev_attrs[] = { &dev_attr_status.attr, &dev_attr_detach.attr, &dev_attr_attach.attr, &dev_attr_usbip_debug.attr, NULL, }; const struct attribute_group dev_attr_group = { .attrs = dev_attrs, };