hw/usb/u2f.h

   1 /*
   2  * U2F USB device.
   3  *
   4  * Copyright (c) 2020 César Belley <cesar.belley@lse.epita.fr>
   5  * Written by César Belley <cesar.belley@lse.epita.fr>
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25
  26 #ifndef U2F_H
  27 #define U2F_H
  28
  29 #include "hw/qdev-core.h"
  30
  31 #define U2FHID_PACKET_SIZE 64
  32 #define U2FHID_PENDING_IN_NUM 32
  33
  34 typedef struct U2FKeyInfo U2FKeyInfo;
  35
  36 #define TYPE_U2F_KEY "u2f-key"
  37 OBJECT_DECLARE_TYPE(U2FKeyState, U2FKeyClass, U2F_KEY)
  38
  39 /*
  40  * Callbacks to be used by the U2F key base device (i.e. hw/u2f.c)
  41  * to interact with its variants (i.e. hw/u2f-*.c)
  42  */
  43 struct U2FKeyClass {
  44     /*< private >*/
  45     USBDeviceClass parent_class;
  46
  47     /*< public >*/
  48     void (*recv_from_guest)(U2FKeyState *key,
  49                             const uint8_t packet[U2FHID_PACKET_SIZE]);
  50     void (*realize)(U2FKeyState *key, Error **errp);
  51     void (*unrealize)(U2FKeyState *key);
  52 };
  53
  54 /*
  55  * State of the U2F key base device (i.e. hw/u2f.c)
  56  */
  57 struct U2FKeyState {
  58     USBDevice dev;
  59     USBEndpoint *ep;
  60     uint8_t idle;
  61
  62     /* Pending packets to be send to the guest */
  63     uint8_t pending_in[U2FHID_PENDING_IN_NUM][U2FHID_PACKET_SIZE];
  64     uint8_t pending_in_start;
  65     uint8_t pending_in_end;
  66     uint8_t pending_in_num;
  67 };
  68
  69 /*
  70  * API to be used by the U2F key device variants (i.e. hw/u2f-*.c)
  71  * to interact with the U2F key base device (i.e. hw/u2f.c)
  72  */
  73 void u2f_send_to_guest(U2FKeyState *key,
  74                        const uint8_t packet[U2FHID_PACKET_SIZE]);
  75
  76 extern const VMStateDescription vmstate_u2f_key;
  77
  78 #define VMSTATE_U2F_KEY(_field, _state) {                            \
  79     .name       = (stringify(_field)),                               \
  80     .size       = sizeof(U2FKeyState),                               \
  81     .vmsd       = &vmstate_u2f_key,                                  \
  82     .flags      = VMS_STRUCT,                                        \
  83     .offset     = vmstate_offset_value(_state, _field, U2FKeyState), \
  84 }
  85
  86 #endif /* U2F_H */