net/bluetooth/smp.h

   1 /*
   2    BlueZ - Bluetooth protocol stack for Linux
   3    Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License version 2 as
   7    published by the Free Software Foundation;
   8
   9    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  10    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  11    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
  12    IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
  13    CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
  14    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17
  18    ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
  19    COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
  20    SOFTWARE IS DISCLAIMED.
  21 */
  22
  23 #ifndef __SMP_H
  24 #define __SMP_H
  25
  26 struct smp_command_hdr {
  27         __u8    code;
  28 } __packed;
  29
  30 #define SMP_CMD_PAIRING_REQ     0x01
  31 #define SMP_CMD_PAIRING_RSP     0x02
  32 struct smp_cmd_pairing {
  33         __u8    io_capability;
  34         __u8    oob_flag;
  35         __u8    auth_req;
  36         __u8    max_key_size;
  37         __u8    init_key_dist;
  38         __u8    resp_key_dist;
  39 } __packed;
  40
  41 #define SMP_IO_DISPLAY_ONLY     0x00
  42 #define SMP_IO_DISPLAY_YESNO    0x01
  43 #define SMP_IO_KEYBOARD_ONLY    0x02
  44 #define SMP_IO_NO_INPUT_OUTPUT  0x03
  45 #define SMP_IO_KEYBOARD_DISPLAY 0x04
  46
  47 #define SMP_OOB_NOT_PRESENT     0x00
  48 #define SMP_OOB_PRESENT         0x01
  49
  50 #define SMP_DIST_ENC_KEY        0x01
  51 #define SMP_DIST_ID_KEY         0x02
  52 #define SMP_DIST_SIGN           0x04
  53 #define SMP_DIST_LINK_KEY       0x08
  54
  55 #define SMP_AUTH_NONE           0x00
  56 #define SMP_AUTH_BONDING        0x01
  57 #define SMP_AUTH_MITM           0x04
  58 #define SMP_AUTH_SC             0x08
  59 #define SMP_AUTH_KEYPRESS       0x10
  60
  61 #define SMP_CMD_PAIRING_CONFIRM 0x03
  62 struct smp_cmd_pairing_confirm {
  63         __u8    confirm_val[16];
  64 } __packed;
  65
  66 #define SMP_CMD_PAIRING_RANDOM  0x04
  67 struct smp_cmd_pairing_random {
  68         __u8    rand_val[16];
  69 } __packed;
  70
  71 #define SMP_CMD_PAIRING_FAIL    0x05
  72 struct smp_cmd_pairing_fail {
  73         __u8    reason;
  74 } __packed;
  75
  76 #define SMP_CMD_ENCRYPT_INFO    0x06
  77 struct smp_cmd_encrypt_info {
  78         __u8    ltk[16];
  79 } __packed;
  80
  81 #define SMP_CMD_MASTER_IDENT    0x07
  82 struct smp_cmd_master_ident {
  83         __le16  ediv;
  84         __le64  rand;
  85 } __packed;
  86
  87 #define SMP_CMD_IDENT_INFO      0x08
  88 struct smp_cmd_ident_info {
  89         __u8    irk[16];
  90 } __packed;
  91
  92 #define SMP_CMD_IDENT_ADDR_INFO 0x09
  93 struct smp_cmd_ident_addr_info {
  94         __u8    addr_type;
  95         bdaddr_t bdaddr;
  96 } __packed;
  97
  98 #define SMP_CMD_SIGN_INFO       0x0a
  99 struct smp_cmd_sign_info {
 100         __u8    csrk[16];
 101 } __packed;
 102
 103 #define SMP_CMD_SECURITY_REQ    0x0b
 104 struct smp_cmd_security_req {
 105         __u8    auth_req;
 106 } __packed;
 107
 108 #define SMP_CMD_PUBLIC_KEY      0x0c
 109 struct smp_cmd_public_key {
 110         __u8    x[32];
 111         __u8    y[32];
 112 } __packed;
 113
 114 #define SMP_CMD_DHKEY_CHECK     0x0d
 115 struct smp_cmd_dhkey_check {
 116         __u8    e[16];
 117 } __packed;
 118
 119 #define SMP_CMD_KEYPRESS_NOTIFY 0x0e
 120 struct smp_cmd_keypress_notify {
 121         __u8    value;
 122 } __packed;
 123
 124 #define SMP_CMD_MAX             0x0e
 125
 126 #define SMP_PASSKEY_ENTRY_FAILED        0x01
 127 #define SMP_OOB_NOT_AVAIL               0x02
 128 #define SMP_AUTH_REQUIREMENTS           0x03
 129 #define SMP_CONFIRM_FAILED              0x04
 130 #define SMP_PAIRING_NOTSUPP             0x05
 131 #define SMP_ENC_KEY_SIZE                0x06
 132 #define SMP_CMD_NOTSUPP                 0x07
 133 #define SMP_UNSPECIFIED                 0x08
 134 #define SMP_REPEATED_ATTEMPTS           0x09
 135 #define SMP_INVALID_PARAMS              0x0a
 136 #define SMP_DHKEY_CHECK_FAILED          0x0b
 137 #define SMP_NUMERIC_COMP_FAILED         0x0c
 138 #define SMP_BREDR_PAIRING_IN_PROGRESS   0x0d
 139 #define SMP_CROSS_TRANSP_NOT_ALLOWED    0x0e
 140
 141 #define SMP_MIN_ENC_KEY_SIZE            7
 142 #define SMP_MAX_ENC_KEY_SIZE            16
 143
 144 /* LTK types used in internal storage (struct smp_ltk) */
 145 enum {
 146         SMP_STK,
 147         SMP_LTK,
 148         SMP_LTK_SLAVE,
 149         SMP_LTK_P256,
 150         SMP_LTK_P256_DEBUG,
 151 };
 152
 153 static inline bool smp_ltk_is_sc(struct smp_ltk *key)
 154 {
 155         switch (key->type) {
 156         case SMP_LTK_P256:
 157         case SMP_LTK_P256_DEBUG:
 158                 return true;
 159         }
 160
 161         return false;
 162 }
 163
 164 static inline u8 smp_ltk_sec_level(struct smp_ltk *key)
 165 {
 166         if (key->authenticated) {
 167                 if (smp_ltk_is_sc(key))
 168                         return BT_SECURITY_FIPS;
 169                 else
 170                         return BT_SECURITY_HIGH;
 171         }
 172
 173         return BT_SECURITY_MEDIUM;
 174 }
 175
 176 /* Key preferences for smp_sufficient security */
 177 enum smp_key_pref {
 178         SMP_ALLOW_STK,
 179         SMP_USE_LTK,
 180 };
 181
 182 /* SMP Commands */
 183 void smp_cancel_pairing(struct hci_conn *hcon);
 184 bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level,
 185                              enum smp_key_pref key_pref);
 186 int smp_conn_security(struct hci_conn *hcon, __u8 sec_level);
 187 int smp_user_confirm_reply(struct hci_conn *conn, u16 mgmt_op, __le32 passkey);
 188
 189 bool smp_irk_matches(struct hci_dev *hdev, const u8 irk[16],
 190                      const bdaddr_t *bdaddr);
 191 int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa);
 192 int smp_generate_oob(struct hci_dev *hdev, u8 hash[16], u8 rand[16]);
 193
 194 int smp_register(struct hci_dev *hdev);
 195 void smp_unregister(struct hci_dev *hdev);
 196
 197 #if IS_ENABLED(CONFIG_BT_SELFTEST_SMP)
 198
 199 int bt_selftest_smp(void);
 200
 201 #else
 202
 203 static inline int bt_selftest_smp(void)
 204 {
 205         return 0;
 206 }
 207
 208 #endif
 209
 210 #endif /* __SMP_H */