drivers/usb/usbip/usbip_common.h

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2003-2008 Takahiro Hirofuchi
   4  * Copyright (C) 2015-2016 Samsung Electronics
   5  *               Krzysztof Opasiak <k.opasiak@samsung.com>
   6  */
   7
   8 #ifndef __USBIP_COMMON_H
   9 #define __USBIP_COMMON_H
  10
  11 #include <linux/compiler.h>
  12 #include <linux/device.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/net.h>
  15 #include <linux/printk.h>
  16 #include <linux/spinlock.h>
  17 #include <linux/types.h>
  18 #include <linux/usb.h>
  19 #include <linux/wait.h>
  20 #include <linux/sched/task.h>
  21 #include <uapi/linux/usbip.h>
  22
  23 #undef pr_fmt
  24
  25 #ifdef DEBUG
  26 #define pr_fmt(fmt)     KBUILD_MODNAME ": %s:%d: " fmt, __func__, __LINE__
  27 #else
  28 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
  29 #endif
  30
  31 enum {
  32         usbip_debug_xmit        = (1 << 0),
  33         usbip_debug_sysfs       = (1 << 1),
  34         usbip_debug_urb         = (1 << 2),
  35         usbip_debug_eh          = (1 << 3),
  36
  37         usbip_debug_stub_cmp    = (1 << 8),
  38         usbip_debug_stub_dev    = (1 << 9),
  39         usbip_debug_stub_rx     = (1 << 10),
  40         usbip_debug_stub_tx     = (1 << 11),
  41
  42         usbip_debug_vhci_rh     = (1 << 8),
  43         usbip_debug_vhci_hc     = (1 << 9),
  44         usbip_debug_vhci_rx     = (1 << 10),
  45         usbip_debug_vhci_tx     = (1 << 11),
  46         usbip_debug_vhci_sysfs  = (1 << 12)
  47 };
  48
  49 #define usbip_dbg_flag_xmit     (usbip_debug_flag & usbip_debug_xmit)
  50 #define usbip_dbg_flag_vhci_rh  (usbip_debug_flag & usbip_debug_vhci_rh)
  51 #define usbip_dbg_flag_vhci_hc  (usbip_debug_flag & usbip_debug_vhci_hc)
  52 #define usbip_dbg_flag_vhci_rx  (usbip_debug_flag & usbip_debug_vhci_rx)
  53 #define usbip_dbg_flag_vhci_tx  (usbip_debug_flag & usbip_debug_vhci_tx)
  54 #define usbip_dbg_flag_stub_rx  (usbip_debug_flag & usbip_debug_stub_rx)
  55 #define usbip_dbg_flag_stub_tx  (usbip_debug_flag & usbip_debug_stub_tx)
  56 #define usbip_dbg_flag_vhci_sysfs  (usbip_debug_flag & usbip_debug_vhci_sysfs)
  57
  58 extern unsigned long usbip_debug_flag;
  59 extern struct device_attribute dev_attr_usbip_debug;
  60
  61 #define usbip_dbg_with_flag(flag, fmt, args...)         \
  62         do {                                            \
  63                 if (flag & usbip_debug_flag)            \
  64                         pr_debug(fmt, ##args);          \
  65         } while (0)
  66
  67 #define usbip_dbg_sysfs(fmt, args...) \
  68         usbip_dbg_with_flag(usbip_debug_sysfs, fmt , ##args)
  69 #define usbip_dbg_xmit(fmt, args...) \
  70         usbip_dbg_with_flag(usbip_debug_xmit, fmt , ##args)
  71 #define usbip_dbg_urb(fmt, args...) \
  72         usbip_dbg_with_flag(usbip_debug_urb, fmt , ##args)
  73 #define usbip_dbg_eh(fmt, args...) \
  74         usbip_dbg_with_flag(usbip_debug_eh, fmt , ##args)
  75
  76 #define usbip_dbg_vhci_rh(fmt, args...) \
  77         usbip_dbg_with_flag(usbip_debug_vhci_rh, fmt , ##args)
  78 #define usbip_dbg_vhci_hc(fmt, args...) \
  79         usbip_dbg_with_flag(usbip_debug_vhci_hc, fmt , ##args)
  80 #define usbip_dbg_vhci_rx(fmt, args...) \
  81         usbip_dbg_with_flag(usbip_debug_vhci_rx, fmt , ##args)
  82 #define usbip_dbg_vhci_tx(fmt, args...) \
  83         usbip_dbg_with_flag(usbip_debug_vhci_tx, fmt , ##args)
  84 #define usbip_dbg_vhci_sysfs(fmt, args...) \
  85         usbip_dbg_with_flag(usbip_debug_vhci_sysfs, fmt , ##args)
  86
  87 #define usbip_dbg_stub_cmp(fmt, args...) \
  88         usbip_dbg_with_flag(usbip_debug_stub_cmp, fmt , ##args)
  89 #define usbip_dbg_stub_rx(fmt, args...) \
  90         usbip_dbg_with_flag(usbip_debug_stub_rx, fmt , ##args)
  91 #define usbip_dbg_stub_tx(fmt, args...) \
  92         usbip_dbg_with_flag(usbip_debug_stub_tx, fmt , ##args)
  93
  94 /*
  95  * USB/IP request headers
  96  *
  97  * Each request is transferred across the network to its counterpart, which
  98  * facilitates the normal USB communication. The values contained in the headers
  99  * are basically the same as in a URB. Currently, four request types are
 100  * defined:
 101  *
 102  *  - USBIP_CMD_SUBMIT: a USB request block, corresponds to usb_submit_urb()
 103  *    (client to server)
 104  *
 105  *  - USBIP_RET_SUBMIT: the result of USBIP_CMD_SUBMIT
 106  *    (server to client)
 107  *
 108  *  - USBIP_CMD_UNLINK: an unlink request of a pending USBIP_CMD_SUBMIT,
 109  *    corresponds to usb_unlink_urb()
 110  *    (client to server)
 111  *
 112  *  - USBIP_RET_UNLINK: the result of USBIP_CMD_UNLINK
 113  *    (server to client)
 114  *
 115  */
 116 #define USBIP_CMD_SUBMIT        0x0001
 117 #define USBIP_CMD_UNLINK        0x0002
 118 #define USBIP_RET_SUBMIT        0x0003
 119 #define USBIP_RET_UNLINK        0x0004
 120
 121 #define USBIP_DIR_OUT   0x00
 122 #define USBIP_DIR_IN    0x01
 123
 124 /*
 125  * Arbitrary limit for the maximum number of isochronous packets in an URB,
 126  * compare for example the uhci_submit_isochronous function in
 127  * drivers/usb/host/uhci-q.c
 128  */
 129 #define USBIP_MAX_ISO_PACKETS 1024
 130
 131 /**
 132  * struct usbip_header_basic - data pertinent to every request
 133  * @command: the usbip request type
 134  * @seqnum: sequential number that identifies requests; incremented per
 135  *          connection
 136  * @devid: specifies a remote USB device uniquely instead of busnum and devnum;
 137  *         in the stub driver, this value is ((busnum << 16) | devnum)
 138  * @direction: direction of the transfer
 139  * @ep: endpoint number
 140  */
 141 struct usbip_header_basic {
 142         __u32 command;
 143         __u32 seqnum;
 144         __u32 devid;
 145         __u32 direction;
 146         __u32 ep;
 147 } __packed;
 148
 149 /**
 150  * struct usbip_header_cmd_submit - USBIP_CMD_SUBMIT packet header
 151  * @transfer_flags: URB flags
 152  * @transfer_buffer_length: the data size for (in) or (out) transfer
 153  * @start_frame: initial frame for isochronous or interrupt transfers
 154  * @number_of_packets: number of isochronous packets
 155  * @interval: maximum time for the request on the server-side host controller
 156  * @setup: setup data for a control request
 157  */
 158 struct usbip_header_cmd_submit {
 159         __u32 transfer_flags;
 160         __s32 transfer_buffer_length;
 161
 162         /* it is difficult for usbip to sync frames (reserved only?) */
 163         __s32 start_frame;
 164         __s32 number_of_packets;
 165         __s32 interval;
 166
 167         unsigned char setup[8];
 168 } __packed;
 169
 170 /**
 171  * struct usbip_header_ret_submit - USBIP_RET_SUBMIT packet header
 172  * @status: return status of a non-iso request
 173  * @actual_length: number of bytes transferred
 174  * @start_frame: initial frame for isochronous or interrupt transfers
 175  * @number_of_packets: number of isochronous packets
 176  * @error_count: number of errors for isochronous transfers
 177  */
 178 struct usbip_header_ret_submit {
 179         __s32 status;
 180         __s32 actual_length;
 181         __s32 start_frame;
 182         __s32 number_of_packets;
 183         __s32 error_count;
 184 } __packed;
 185
 186 /**
 187  * struct usbip_header_cmd_unlink - USBIP_CMD_UNLINK packet header
 188  * @seqnum: the URB seqnum to unlink
 189  */
 190 struct usbip_header_cmd_unlink {
 191         __u32 seqnum;
 192 } __packed;
 193
 194 /**
 195  * struct usbip_header_ret_unlink - USBIP_RET_UNLINK packet header
 196  * @status: return status of the request
 197  */
 198 struct usbip_header_ret_unlink {
 199         __s32 status;
 200 } __packed;
 201
 202 /**
 203  * struct usbip_header - common header for all usbip packets
 204  * @base: the basic header
 205  * @u: packet type dependent header
 206  */
 207 struct usbip_header {
 208         struct usbip_header_basic base;
 209
 210         union {
 211                 struct usbip_header_cmd_submit  cmd_submit;
 212                 struct usbip_header_ret_submit  ret_submit;
 213                 struct usbip_header_cmd_unlink  cmd_unlink;
 214                 struct usbip_header_ret_unlink  ret_unlink;
 215         } u;
 216 } __packed;
 217
 218 /*
 219  * This is the same as usb_iso_packet_descriptor but packed for pdu.
 220  */
 221 struct usbip_iso_packet_descriptor {
 222         __u32 offset;
 223         __u32 length;                   /* expected length */
 224         __u32 actual_length;
 225         __u32 status;
 226 } __packed;
 227
 228 enum usbip_side {
 229         USBIP_VHCI,
 230         USBIP_STUB,
 231         USBIP_VUDC,
 232 };
 233
 234 /* event handler */
 235 #define USBIP_EH_SHUTDOWN       (1 << 0)
 236 #define USBIP_EH_BYE            (1 << 1)
 237 #define USBIP_EH_RESET          (1 << 2)
 238 #define USBIP_EH_UNUSABLE       (1 << 3)
 239
 240 #define SDEV_EVENT_REMOVED      (USBIP_EH_SHUTDOWN | USBIP_EH_BYE)
 241 #define SDEV_EVENT_DOWN         (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 242 #define SDEV_EVENT_ERROR_TCP    (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 243 #define SDEV_EVENT_ERROR_SUBMIT (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 244 #define SDEV_EVENT_ERROR_MALLOC (USBIP_EH_SHUTDOWN | USBIP_EH_UNUSABLE)
 245
 246 #define VUDC_EVENT_REMOVED   (USBIP_EH_SHUTDOWN | USBIP_EH_RESET | USBIP_EH_BYE)
 247 #define VUDC_EVENT_DOWN         (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 248 #define VUDC_EVENT_ERROR_TCP    (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 249 /* catastrophic emulated usb error */
 250 #define VUDC_EVENT_ERROR_USB    (USBIP_EH_SHUTDOWN | USBIP_EH_UNUSABLE)
 251 #define VUDC_EVENT_ERROR_MALLOC (USBIP_EH_SHUTDOWN | USBIP_EH_UNUSABLE)
 252
 253 #define VDEV_EVENT_REMOVED (USBIP_EH_SHUTDOWN | USBIP_EH_RESET | USBIP_EH_BYE)
 254 #define VDEV_EVENT_DOWN         (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 255 #define VDEV_EVENT_ERROR_TCP    (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 256 #define VDEV_EVENT_ERROR_MALLOC (USBIP_EH_SHUTDOWN | USBIP_EH_UNUSABLE)
 257
 258 /* a common structure for stub_device and vhci_device */
 259 struct usbip_device {
 260         enum usbip_side side;
 261         enum usbip_device_status status;
 262
 263         /* lock for status */
 264         spinlock_t lock;
 265
 266         int sockfd;
 267         struct socket *tcp_socket;
 268
 269         struct task_struct *tcp_rx;
 270         struct task_struct *tcp_tx;
 271
 272         unsigned long event;
 273         wait_queue_head_t eh_waitq;
 274
 275         struct eh_ops {
 276                 void (*shutdown)(struct usbip_device *);
 277                 void (*reset)(struct usbip_device *);
 278                 void (*unusable)(struct usbip_device *);
 279         } eh_ops;
 280 };
 281
 282 #define kthread_get_run(threadfn, data, namefmt, ...)                      \
 283 ({                                                                         \
 284         struct task_struct *__k                                            \
 285                 = kthread_create(threadfn, data, namefmt, ## __VA_ARGS__); \
 286         if (!IS_ERR(__k)) {                                                \
 287                 get_task_struct(__k);                                      \
 288                 wake_up_process(__k);                                      \
 289         }                                                                  \
 290         __k;                                                               \
 291 })
 292
 293 #define kthread_stop_put(k)             \
 294         do {                            \
 295                 kthread_stop(k);        \
 296                 put_task_struct(k);     \
 297         } while (0)
 298
 299 /* usbip_common.c */
 300 void usbip_dump_urb(struct urb *purb);
 301 void usbip_dump_header(struct usbip_header *pdu);
 302
 303 int usbip_recv(struct socket *sock, void *buf, int size);
 304
 305 void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
 306                     int pack);
 307 void usbip_header_correct_endian(struct usbip_header *pdu, int send);
 308
 309 struct usbip_iso_packet_descriptor*
 310 usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen);
 311
 312 /* some members of urb must be substituted before. */
 313 int usbip_recv_iso(struct usbip_device *ud, struct urb *urb);
 314 void usbip_pad_iso(struct usbip_device *ud, struct urb *urb);
 315 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb);
 316
 317 /* usbip_event.c */
 318 int usbip_init_eh(void);
 319 void usbip_finish_eh(void);
 320 int usbip_start_eh(struct usbip_device *ud);
 321 void usbip_stop_eh(struct usbip_device *ud);
 322 void usbip_event_add(struct usbip_device *ud, unsigned long event);
 323 int usbip_event_happened(struct usbip_device *ud);
 324 int usbip_in_eh(struct task_struct *task);
 325
 326 static inline int interface_to_busnum(struct usb_interface *interface)
 327 {
 328         struct usb_device *udev = interface_to_usbdev(interface);
 329
 330         return udev->bus->busnum;
 331 }
 332
 333 static inline int interface_to_devnum(struct usb_interface *interface)
 334 {
 335         struct usb_device *udev = interface_to_usbdev(interface);
 336
 337         return udev->devnum;
 338 }
 339
 340 #endif /* __USBIP_COMMON_H */