Takahiro Hirofuchi | 04679b3 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2003-2008 Takahiro Hirofuchi |
| 3 | * |
| 4 | * This is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
| 17 | * USA. |
| 18 | */ |
| 19 | |
| 20 | #include "usbip_common.h" |
| 21 | #include "vhci.h" |
| 22 | |
| 23 | #include <linux/in.h> |
| 24 | |
| 25 | /* TODO: refine locking ?*/ |
| 26 | |
| 27 | /* Sysfs entry to show port status */ |
| 28 | static ssize_t show_status(struct device *dev, struct device_attribute *attr, |
| 29 | char *out) |
| 30 | { |
| 31 | char *s = out; |
| 32 | int i = 0; |
| 33 | |
Stoyan Gaydarov | 2961f24 | 2009-03-10 00:10:27 -0500 | [diff] [blame] | 34 | BUG_ON(!the_controller || !out); |
Takahiro Hirofuchi | 04679b3 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 35 | |
| 36 | spin_lock(&the_controller->lock); |
| 37 | |
| 38 | /* |
| 39 | * output example: |
| 40 | * prt sta spd dev socket local_busid |
| 41 | * 000 004 000 000 c5a7bb80 1-2.3 |
| 42 | * 001 004 000 000 d8cee980 2-3.4 |
| 43 | * |
| 44 | * IP address can be retrieved from a socket pointer address by looking |
| 45 | * up /proc/net/{tcp,tcp6}. Also, a userland program may remember a |
| 46 | * port number and its peer IP address. |
| 47 | */ |
| 48 | out += sprintf(out, "prt sta spd bus dev socket " |
| 49 | "local_busid\n"); |
| 50 | |
| 51 | for (i = 0; i < VHCI_NPORTS; i++) { |
| 52 | struct vhci_device *vdev = port_to_vdev(i); |
| 53 | |
| 54 | spin_lock(&vdev->ud.lock); |
| 55 | |
| 56 | out += sprintf(out, "%03u %03u ", i, vdev->ud.status); |
| 57 | |
| 58 | if (vdev->ud.status == VDEV_ST_USED) { |
| 59 | out += sprintf(out, "%03u %08x ", |
| 60 | vdev->speed, vdev->devid); |
| 61 | out += sprintf(out, "%16p ", vdev->ud.tcp_socket); |
Kay Sievers | e913397 | 2008-10-30 01:59:32 +0100 | [diff] [blame] | 62 | out += sprintf(out, "%s", dev_name(&vdev->udev->dev)); |
Takahiro Hirofuchi | 04679b3 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 63 | |
| 64 | } else |
| 65 | out += sprintf(out, "000 000 000 0000000000000000 0-0"); |
| 66 | |
| 67 | out += sprintf(out, "\n"); |
| 68 | |
| 69 | spin_unlock(&vdev->ud.lock); |
| 70 | } |
| 71 | |
| 72 | spin_unlock(&the_controller->lock); |
| 73 | |
| 74 | return out - s; |
| 75 | } |
| 76 | static DEVICE_ATTR(status, S_IRUGO, show_status, NULL); |
| 77 | |
| 78 | /* Sysfs entry to shutdown a virtual connection */ |
| 79 | static int vhci_port_disconnect(__u32 rhport) |
| 80 | { |
| 81 | struct vhci_device *vdev; |
| 82 | |
Brian G. Merrell | b8868e4 | 2009-07-21 00:46:13 -0600 | [diff] [blame] | 83 | usbip_dbg_vhci_sysfs("enter\n"); |
Takahiro Hirofuchi | 04679b3 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 84 | |
| 85 | /* lock */ |
| 86 | spin_lock(&the_controller->lock); |
| 87 | |
| 88 | vdev = port_to_vdev(rhport); |
| 89 | |
| 90 | spin_lock(&vdev->ud.lock); |
| 91 | if (vdev->ud.status == VDEV_ST_NULL) { |
Brian G. Merrell | b8868e4 | 2009-07-21 00:46:13 -0600 | [diff] [blame] | 92 | usbip_uerr("not connected %d\n", vdev->ud.status); |
Takahiro Hirofuchi | 04679b3 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 93 | |
| 94 | /* unlock */ |
| 95 | spin_unlock(&vdev->ud.lock); |
| 96 | spin_unlock(&the_controller->lock); |
| 97 | |
| 98 | return -EINVAL; |
| 99 | } |
| 100 | |
| 101 | /* unlock */ |
| 102 | spin_unlock(&vdev->ud.lock); |
| 103 | spin_unlock(&the_controller->lock); |
| 104 | |
| 105 | usbip_event_add(&vdev->ud, VDEV_EVENT_DOWN); |
| 106 | |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | static ssize_t store_detach(struct device *dev, struct device_attribute *attr, |
| 111 | const char *buf, size_t count) |
| 112 | { |
| 113 | int err; |
| 114 | __u32 rhport = 0; |
| 115 | |
| 116 | sscanf(buf, "%u", &rhport); |
| 117 | |
| 118 | /* check rhport */ |
| 119 | if (rhport >= VHCI_NPORTS) { |
Brian G. Merrell | b8868e4 | 2009-07-21 00:46:13 -0600 | [diff] [blame] | 120 | usbip_uerr("invalid port %u\n", rhport); |
Takahiro Hirofuchi | 04679b3 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 121 | return -EINVAL; |
| 122 | } |
| 123 | |
| 124 | err = vhci_port_disconnect(rhport); |
| 125 | if (err < 0) |
| 126 | return -EINVAL; |
| 127 | |
Brian G. Merrell | b8868e4 | 2009-07-21 00:46:13 -0600 | [diff] [blame] | 128 | usbip_dbg_vhci_sysfs("Leave\n"); |
Takahiro Hirofuchi | 04679b3 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 129 | return count; |
| 130 | } |
| 131 | static DEVICE_ATTR(detach, S_IWUSR, NULL, store_detach); |
| 132 | |
| 133 | /* Sysfs entry to establish a virtual connection */ |
| 134 | static int valid_args(__u32 rhport, enum usb_device_speed speed) |
| 135 | { |
| 136 | /* check rhport */ |
| 137 | if ((rhport < 0) || (rhport >= VHCI_NPORTS)) { |
Brian G. Merrell | b8868e4 | 2009-07-21 00:46:13 -0600 | [diff] [blame] | 138 | usbip_uerr("port %u\n", rhport); |
Takahiro Hirofuchi | 04679b3 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 139 | return -EINVAL; |
| 140 | } |
| 141 | |
| 142 | /* check speed */ |
| 143 | switch (speed) { |
| 144 | case USB_SPEED_LOW: |
| 145 | case USB_SPEED_FULL: |
| 146 | case USB_SPEED_HIGH: |
Greg Kroah-Hartman | 551cdbb | 2010-01-14 11:08:04 -0800 | [diff] [blame] | 147 | case USB_SPEED_WIRELESS: |
Takahiro Hirofuchi | 04679b3 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 148 | break; |
| 149 | default: |
Brian G. Merrell | b8868e4 | 2009-07-21 00:46:13 -0600 | [diff] [blame] | 150 | usbip_uerr("speed %d\n", speed); |
Takahiro Hirofuchi | 04679b3 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 151 | return -EINVAL; |
| 152 | } |
| 153 | |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | /* |
| 158 | * To start a new USB/IP attachment, a userland program needs to setup a TCP |
| 159 | * connection and then write its socket descriptor with remote device |
| 160 | * information into this sysfs file. |
| 161 | * |
| 162 | * A remote device is virtually attached to the root-hub port of @rhport with |
| 163 | * @speed. @devid is embedded into a request to specify the remote device in a |
| 164 | * server host. |
| 165 | * |
| 166 | * write() returns 0 on success, else negative errno. |
| 167 | */ |
| 168 | static ssize_t store_attach(struct device *dev, struct device_attribute *attr, |
| 169 | const char *buf, size_t count) |
| 170 | { |
| 171 | struct vhci_device *vdev; |
| 172 | struct socket *socket; |
| 173 | int sockfd = 0; |
| 174 | __u32 rhport = 0, devid = 0, speed = 0; |
| 175 | |
| 176 | /* |
| 177 | * @rhport: port number of vhci_hcd |
| 178 | * @sockfd: socket descriptor of an established TCP connection |
| 179 | * @devid: unique device identifier in a remote host |
| 180 | * @speed: usb device speed in a remote host |
| 181 | */ |
| 182 | sscanf(buf, "%u %u %u %u", &rhport, &sockfd, &devid, &speed); |
| 183 | |
Brian G. Merrell | b8868e4 | 2009-07-21 00:46:13 -0600 | [diff] [blame] | 184 | usbip_dbg_vhci_sysfs("rhport(%u) sockfd(%u) devid(%u) speed(%u)\n", |
| 185 | rhport, sockfd, devid, speed); |
Takahiro Hirofuchi | 04679b3 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 186 | |
| 187 | |
| 188 | /* check received parameters */ |
| 189 | if (valid_args(rhport, speed) < 0) |
| 190 | return -EINVAL; |
| 191 | |
| 192 | /* check sockfd */ |
| 193 | socket = sockfd_to_socket(sockfd); |
| 194 | if (!socket) |
| 195 | return -EINVAL; |
| 196 | |
| 197 | /* now need lock until setting vdev status as used */ |
| 198 | |
| 199 | /* begin a lock */ |
| 200 | spin_lock(&the_controller->lock); |
| 201 | |
| 202 | vdev = port_to_vdev(rhport); |
| 203 | |
| 204 | spin_lock(&vdev->ud.lock); |
| 205 | |
| 206 | if (vdev->ud.status != VDEV_ST_NULL) { |
| 207 | /* end of the lock */ |
| 208 | spin_unlock(&vdev->ud.lock); |
| 209 | spin_unlock(&the_controller->lock); |
| 210 | |
Brian G. Merrell | b8868e4 | 2009-07-21 00:46:13 -0600 | [diff] [blame] | 211 | usbip_uerr("port %d already used\n", rhport); |
Takahiro Hirofuchi | 04679b3 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 212 | return -EINVAL; |
| 213 | } |
| 214 | |
Brian G. Merrell | b8868e4 | 2009-07-21 00:46:13 -0600 | [diff] [blame] | 215 | usbip_uinfo("rhport(%u) sockfd(%d) devid(%u) speed(%u)\n", |
| 216 | rhport, sockfd, devid, speed); |
Takahiro Hirofuchi | 04679b3 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 217 | |
| 218 | vdev->devid = devid; |
| 219 | vdev->speed = speed; |
| 220 | vdev->ud.tcp_socket = socket; |
| 221 | vdev->ud.status = VDEV_ST_NOTASSIGNED; |
| 222 | |
Arnd Bergmann | 9720b4b | 2011-03-02 00:13:05 +0100 | [diff] [blame] | 223 | wake_up_process(vdev->ud.tcp_rx); |
| 224 | wake_up_process(vdev->ud.tcp_tx); |
| 225 | |
Takahiro Hirofuchi | 04679b3 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 226 | spin_unlock(&vdev->ud.lock); |
| 227 | spin_unlock(&the_controller->lock); |
| 228 | /* end the lock */ |
| 229 | |
Takahiro Hirofuchi | 04679b3 | 2008-07-09 14:56:51 -0600 | [diff] [blame] | 230 | rh_port_connect(rhport, speed); |
| 231 | |
| 232 | return count; |
| 233 | } |
| 234 | static DEVICE_ATTR(attach, S_IWUSR, NULL, store_attach); |
| 235 | |
| 236 | static struct attribute *dev_attrs[] = { |
| 237 | &dev_attr_status.attr, |
| 238 | &dev_attr_detach.attr, |
| 239 | &dev_attr_attach.attr, |
| 240 | &dev_attr_usbip_debug.attr, |
| 241 | NULL, |
| 242 | }; |
| 243 | |
| 244 | struct attribute_group dev_attr_group = { |
| 245 | .attrs = dev_attrs, |
| 246 | }; |