drivers/usb/usbip/usbip_common.h

   1 /*
   2  * Copyright (C) 2003-2008 Takahiro Hirofuchi
   3  * Copyright (C) 2015-2016 Samsung Electronics
   4  *               Krzysztof Opasiak <k.opasiak@samsung.com>
   5  *
   6  * This is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19  * USA.
  20  */
  21
  22 #ifndef __USBIP_COMMON_H
  23 #define __USBIP_COMMON_H
  24
  25 #include <linux/compiler.h>
  26 #include <linux/device.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/net.h>
  29 #include <linux/printk.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/types.h>
  32 #include <linux/usb.h>
  33 #include <linux/wait.h>
  34 #include <uapi/linux/usbip.h>
  35
  36 #define USBIP_VERSION "1.0.0"
  37
  38 #undef pr_fmt
  39
  40 #ifdef DEBUG
  41 #define pr_fmt(fmt)     KBUILD_MODNAME ": %s:%d: " fmt, __func__, __LINE__
  42 #else
  43 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
  44 #endif
  45
  46 enum {
  47         usbip_debug_xmit        = (1 << 0),
  48         usbip_debug_sysfs       = (1 << 1),
  49         usbip_debug_urb         = (1 << 2),
  50         usbip_debug_eh          = (1 << 3),
  51
  52         usbip_debug_stub_cmp    = (1 << 8),
  53         usbip_debug_stub_dev    = (1 << 9),
  54         usbip_debug_stub_rx     = (1 << 10),
  55         usbip_debug_stub_tx     = (1 << 11),
  56
  57         usbip_debug_vhci_rh     = (1 << 8),
  58         usbip_debug_vhci_hc     = (1 << 9),
  59         usbip_debug_vhci_rx     = (1 << 10),
  60         usbip_debug_vhci_tx     = (1 << 11),
  61         usbip_debug_vhci_sysfs  = (1 << 12)
  62 };
  63
  64 #define usbip_dbg_flag_xmit     (usbip_debug_flag & usbip_debug_xmit)
  65 #define usbip_dbg_flag_vhci_rh  (usbip_debug_flag & usbip_debug_vhci_rh)
  66 #define usbip_dbg_flag_vhci_hc  (usbip_debug_flag & usbip_debug_vhci_hc)
  67 #define usbip_dbg_flag_vhci_rx  (usbip_debug_flag & usbip_debug_vhci_rx)
  68 #define usbip_dbg_flag_vhci_tx  (usbip_debug_flag & usbip_debug_vhci_tx)
  69 #define usbip_dbg_flag_stub_rx  (usbip_debug_flag & usbip_debug_stub_rx)
  70 #define usbip_dbg_flag_stub_tx  (usbip_debug_flag & usbip_debug_stub_tx)
  71 #define usbip_dbg_flag_vhci_sysfs  (usbip_debug_flag & usbip_debug_vhci_sysfs)
  72
  73 extern unsigned long usbip_debug_flag;
  74 extern struct device_attribute dev_attr_usbip_debug;
  75
  76 #define usbip_dbg_with_flag(flag, fmt, args...)         \
  77         do {                                            \
  78                 if (flag & usbip_debug_flag)            \
  79                         pr_debug(fmt, ##args);          \
  80         } while (0)
  81
  82 #define usbip_dbg_sysfs(fmt, args...) \
  83         usbip_dbg_with_flag(usbip_debug_sysfs, fmt , ##args)
  84 #define usbip_dbg_xmit(fmt, args...) \
  85         usbip_dbg_with_flag(usbip_debug_xmit, fmt , ##args)
  86 #define usbip_dbg_urb(fmt, args...) \
  87         usbip_dbg_with_flag(usbip_debug_urb, fmt , ##args)
  88 #define usbip_dbg_eh(fmt, args...) \
  89         usbip_dbg_with_flag(usbip_debug_eh, fmt , ##args)
  90
  91 #define usbip_dbg_vhci_rh(fmt, args...) \
  92         usbip_dbg_with_flag(usbip_debug_vhci_rh, fmt , ##args)
  93 #define usbip_dbg_vhci_hc(fmt, args...) \
  94         usbip_dbg_with_flag(usbip_debug_vhci_hc, fmt , ##args)
  95 #define usbip_dbg_vhci_rx(fmt, args...) \
  96         usbip_dbg_with_flag(usbip_debug_vhci_rx, fmt , ##args)
  97 #define usbip_dbg_vhci_tx(fmt, args...) \
  98         usbip_dbg_with_flag(usbip_debug_vhci_tx, fmt , ##args)
  99 #define usbip_dbg_vhci_sysfs(fmt, args...) \
 100         usbip_dbg_with_flag(usbip_debug_vhci_sysfs, fmt , ##args)
 101
 102 #define usbip_dbg_stub_cmp(fmt, args...) \
 103         usbip_dbg_with_flag(usbip_debug_stub_cmp, fmt , ##args)
 104 #define usbip_dbg_stub_rx(fmt, args...) \
 105         usbip_dbg_with_flag(usbip_debug_stub_rx, fmt , ##args)
 106 #define usbip_dbg_stub_tx(fmt, args...) \
 107         usbip_dbg_with_flag(usbip_debug_stub_tx, fmt , ##args)
 108
 109 /*
 110  * USB/IP request headers
 111  *
 112  * Each request is transferred across the network to its counterpart, which
 113  * facilitates the normal USB communication. The values contained in the headers
 114  * are basically the same as in a URB. Currently, four request types are
 115  * defined:
 116  *
 117  *  - USBIP_CMD_SUBMIT: a USB request block, corresponds to usb_submit_urb()
 118  *    (client to server)
 119  *
 120  *  - USBIP_RET_SUBMIT: the result of USBIP_CMD_SUBMIT
 121  *    (server to client)
 122  *
 123  *  - USBIP_CMD_UNLINK: an unlink request of a pending USBIP_CMD_SUBMIT,
 124  *    corresponds to usb_unlink_urb()
 125  *    (client to server)
 126  *
 127  *  - USBIP_RET_UNLINK: the result of USBIP_CMD_UNLINK
 128  *    (server to client)
 129  *
 130  */
 131 #define USBIP_CMD_SUBMIT        0x0001
 132 #define USBIP_CMD_UNLINK        0x0002
 133 #define USBIP_RET_SUBMIT        0x0003
 134 #define USBIP_RET_UNLINK        0x0004
 135
 136 #define USBIP_DIR_OUT   0x00
 137 #define USBIP_DIR_IN    0x01
 138
 139 /**
 140  * struct usbip_header_basic - data pertinent to every request
 141  * @command: the usbip request type
 142  * @seqnum: sequential number that identifies requests; incremented per
 143  *          connection
 144  * @devid: specifies a remote USB device uniquely instead of busnum and devnum;
 145  *         in the stub driver, this value is ((busnum << 16) | devnum)
 146  * @direction: direction of the transfer
 147  * @ep: endpoint number
 148  */
 149 struct usbip_header_basic {
 150         __u32 command;
 151         __u32 seqnum;
 152         __u32 devid;
 153         __u32 direction;
 154         __u32 ep;
 155 } __packed;
 156
 157 /**
 158  * struct usbip_header_cmd_submit - USBIP_CMD_SUBMIT packet header
 159  * @transfer_flags: URB flags
 160  * @transfer_buffer_length: the data size for (in) or (out) transfer
 161  * @start_frame: initial frame for isochronous or interrupt transfers
 162  * @number_of_packets: number of isochronous packets
 163  * @interval: maximum time for the request on the server-side host controller
 164  * @setup: setup data for a control request
 165  */
 166 struct usbip_header_cmd_submit {
 167         __u32 transfer_flags;
 168         __s32 transfer_buffer_length;
 169
 170         /* it is difficult for usbip to sync frames (reserved only?) */
 171         __s32 start_frame;
 172         __s32 number_of_packets;
 173         __s32 interval;
 174
 175         unsigned char setup[8];
 176 } __packed;
 177
 178 /**
 179  * struct usbip_header_ret_submit - USBIP_RET_SUBMIT packet header
 180  * @status: return status of a non-iso request
 181  * @actual_length: number of bytes transferred
 182  * @start_frame: initial frame for isochronous or interrupt transfers
 183  * @number_of_packets: number of isochronous packets
 184  * @error_count: number of errors for isochronous transfers
 185  */
 186 struct usbip_header_ret_submit {
 187         __s32 status;
 188         __s32 actual_length;
 189         __s32 start_frame;
 190         __s32 number_of_packets;
 191         __s32 error_count;
 192 } __packed;
 193
 194 /**
 195  * struct usbip_header_cmd_unlink - USBIP_CMD_UNLINK packet header
 196  * @seqnum: the URB seqnum to unlink
 197  */
 198 struct usbip_header_cmd_unlink {
 199         __u32 seqnum;
 200 } __packed;
 201
 202 /**
 203  * struct usbip_header_ret_unlink - USBIP_RET_UNLINK packet header
 204  * @status: return status of the request
 205  */
 206 struct usbip_header_ret_unlink {
 207         __s32 status;
 208 } __packed;
 209
 210 /**
 211  * struct usbip_header - common header for all usbip packets
 212  * @base: the basic header
 213  * @u: packet type dependent header
 214  */
 215 struct usbip_header {
 216         struct usbip_header_basic base;
 217
 218         union {
 219                 struct usbip_header_cmd_submit  cmd_submit;
 220                 struct usbip_header_ret_submit  ret_submit;
 221                 struct usbip_header_cmd_unlink  cmd_unlink;
 222                 struct usbip_header_ret_unlink  ret_unlink;
 223         } u;
 224 } __packed;
 225
 226 /*
 227  * This is the same as usb_iso_packet_descriptor but packed for pdu.
 228  */
 229 struct usbip_iso_packet_descriptor {
 230         __u32 offset;
 231         __u32 length;                   /* expected length */
 232         __u32 actual_length;
 233         __u32 status;
 234 } __packed;
 235
 236 enum usbip_side {
 237         USBIP_VHCI,
 238         USBIP_STUB,
 239         USBIP_VUDC,
 240 };
 241
 242 /* event handler */
 243 #define USBIP_EH_SHUTDOWN       (1 << 0)
 244 #define USBIP_EH_BYE            (1 << 1)
 245 #define USBIP_EH_RESET          (1 << 2)
 246 #define USBIP_EH_UNUSABLE       (1 << 3)
 247
 248 #define SDEV_EVENT_REMOVED      (USBIP_EH_SHUTDOWN | USBIP_EH_BYE)
 249 #define SDEV_EVENT_DOWN         (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 250 #define SDEV_EVENT_ERROR_TCP    (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 251 #define SDEV_EVENT_ERROR_SUBMIT (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 252 #define SDEV_EVENT_ERROR_MALLOC (USBIP_EH_SHUTDOWN | USBIP_EH_UNUSABLE)
 253
 254 #define VUDC_EVENT_REMOVED   (USBIP_EH_SHUTDOWN | USBIP_EH_RESET | USBIP_EH_BYE)
 255 #define VUDC_EVENT_DOWN         (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 256 #define VUDC_EVENT_ERROR_TCP    (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 257 /* catastrophic emulated usb error */
 258 #define VUDC_EVENT_ERROR_USB    (USBIP_EH_SHUTDOWN | USBIP_EH_UNUSABLE)
 259 #define VUDC_EVENT_ERROR_MALLOC (USBIP_EH_SHUTDOWN | USBIP_EH_UNUSABLE)
 260
 261 #define VDEV_EVENT_REMOVED (USBIP_EH_SHUTDOWN | USBIP_EH_RESET | USBIP_EH_BYE)
 262 #define VDEV_EVENT_DOWN         (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 263 #define VDEV_EVENT_ERROR_TCP    (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 264 #define VDEV_EVENT_ERROR_MALLOC (USBIP_EH_SHUTDOWN | USBIP_EH_UNUSABLE)
 265
 266 /* a common structure for stub_device and vhci_device */
 267 struct usbip_device {
 268         enum usbip_side side;
 269         enum usbip_device_status status;
 270
 271         /* lock for status */
 272         spinlock_t lock;
 273
 274         int sockfd;
 275         struct socket *tcp_socket;
 276
 277         struct task_struct *tcp_rx;
 278         struct task_struct *tcp_tx;
 279
 280         unsigned long event;
 281         wait_queue_head_t eh_waitq;
 282
 283         struct eh_ops {
 284                 void (*shutdown)(struct usbip_device *);
 285                 void (*reset)(struct usbip_device *);
 286                 void (*unusable)(struct usbip_device *);
 287         } eh_ops;
 288 };
 289
 290 #define kthread_get_run(threadfn, data, namefmt, ...)                      \
 291 ({                                                                         \
 292         struct task_struct *__k                                            \
 293                 = kthread_create(threadfn, data, namefmt, ## __VA_ARGS__); \
 294         if (!IS_ERR(__k)) {                                                \
 295                 get_task_struct(__k);                                      \
 296                 wake_up_process(__k);                                      \
 297         }                                                                  \
 298         __k;                                                               \
 299 })
 300
 301 #define kthread_stop_put(k)             \
 302         do {                            \
 303                 kthread_stop(k);        \
 304                 put_task_struct(k);     \
 305         } while (0)
 306
 307 /* usbip_common.c */
 308 void usbip_dump_urb(struct urb *purb);
 309 void usbip_dump_header(struct usbip_header *pdu);
 310
 311 int usbip_recv(struct socket *sock, void *buf, int size);
 312
 313 void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
 314                     int pack);
 315 void usbip_header_correct_endian(struct usbip_header *pdu, int send);
 316
 317 struct usbip_iso_packet_descriptor*
 318 usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen);
 319
 320 /* some members of urb must be substituted before. */
 321 int usbip_recv_iso(struct usbip_device *ud, struct urb *urb);
 322 void usbip_pad_iso(struct usbip_device *ud, struct urb *urb);
 323 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb);
 324
 325 /* usbip_event.c */
 326 int usbip_init_eh(void);
 327 void usbip_finish_eh(void);
 328 int usbip_start_eh(struct usbip_device *ud);
 329 void usbip_stop_eh(struct usbip_device *ud);
 330 void usbip_event_add(struct usbip_device *ud, unsigned long event);
 331 int usbip_event_happened(struct usbip_device *ud);
 332 int usbip_in_eh(struct task_struct *task);
 333
 334 static inline int interface_to_busnum(struct usb_interface *interface)
 335 {
 336         struct usb_device *udev = interface_to_usbdev(interface);
 337
 338         return udev->bus->busnum;
 339 }
 340
 341 static inline int interface_to_devnum(struct usb_interface *interface)
 342 {
 343         struct usb_device *udev = interface_to_usbdev(interface);
 344
 345         return udev->devnum;
 346 }
 347
 348 #endif /* __USBIP_COMMON_H */