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 #define SMP_AUTH_CT2            0x20
  61
  62 #define SMP_CMD_PAIRING_CONFIRM 0x03
  63 struct smp_cmd_pairing_confirm {
  64         __u8    confirm_val[16];
  65 } __packed;
  66
  67 #define SMP_CMD_PAIRING_RANDOM  0x04
  68 struct smp_cmd_pairing_random {
  69         __u8    rand_val[16];
  70 } __packed;
  71
  72 #define SMP_CMD_PAIRING_FAIL    0x05
  73 struct smp_cmd_pairing_fail {
  74         __u8    reason;
  75 } __packed;
  76
  77 #define SMP_CMD_ENCRYPT_INFO    0x06
  78 struct smp_cmd_encrypt_info {
  79         __u8    ltk[16];
  80 } __packed;
  81
  82 #define SMP_CMD_MASTER_IDENT    0x07
  83 struct smp_cmd_master_ident {
  84         __le16  ediv;
  85         __le64  rand;
  86 } __packed;
  87
  88 #define SMP_CMD_IDENT_INFO      0x08
  89 struct smp_cmd_ident_info {
  90         __u8    irk[16];
  91 } __packed;
  92
  93 #define SMP_CMD_IDENT_ADDR_INFO 0x09
  94 struct smp_cmd_ident_addr_info {
  95         __u8    addr_type;
  96         bdaddr_t bdaddr;
  97 } __packed;
  98
  99 #define SMP_CMD_SIGN_INFO       0x0a
 100 struct smp_cmd_sign_info {
 101         __u8    csrk[16];
 102 } __packed;
 103
 104 #define SMP_CMD_SECURITY_REQ    0x0b
 105 struct smp_cmd_security_req {
 106         __u8    auth_req;
 107 } __packed;
 108
 109 #define SMP_CMD_PUBLIC_KEY      0x0c
 110 struct smp_cmd_public_key {
 111         __u8    x[32];
 112         __u8    y[32];
 113 } __packed;
 114
 115 #define SMP_CMD_DHKEY_CHECK     0x0d
 116 struct smp_cmd_dhkey_check {
 117         __u8    e[16];
 118 } __packed;
 119
 120 #define SMP_CMD_KEYPRESS_NOTIFY 0x0e
 121 struct smp_cmd_keypress_notify {
 122         __u8    value;
 123 } __packed;
 124
 125 #define SMP_CMD_MAX             0x0e
 126
 127 #define SMP_PASSKEY_ENTRY_FAILED        0x01
 128 #define SMP_OOB_NOT_AVAIL               0x02
 129 #define SMP_AUTH_REQUIREMENTS           0x03
 130 #define SMP_CONFIRM_FAILED              0x04
 131 #define SMP_PAIRING_NOTSUPP             0x05
 132 #define SMP_ENC_KEY_SIZE                0x06
 133 #define SMP_CMD_NOTSUPP                 0x07
 134 #define SMP_UNSPECIFIED                 0x08
 135 #define SMP_REPEATED_ATTEMPTS           0x09
 136 #define SMP_INVALID_PARAMS              0x0a
 137 #define SMP_DHKEY_CHECK_FAILED          0x0b
 138 #define SMP_NUMERIC_COMP_FAILED         0x0c
 139 #define SMP_BREDR_PAIRING_IN_PROGRESS   0x0d
 140 #define SMP_CROSS_TRANSP_NOT_ALLOWED    0x0e
 141
 142 #define SMP_MIN_ENC_KEY_SIZE            7
 143 #define SMP_MAX_ENC_KEY_SIZE            16
 144
 145 /* LTK types used in internal storage (struct smp_ltk) */
 146 enum {
 147         SMP_STK,
 148         SMP_LTK,
 149         SMP_LTK_SLAVE,
 150         SMP_LTK_P256,
 151         SMP_LTK_P256_DEBUG,
 152 };
 153
 154 static inline bool smp_ltk_is_sc(struct smp_ltk *key)
 155 {
 156         switch (key->type) {
 157         case SMP_LTK_P256:
 158         case SMP_LTK_P256_DEBUG:
 159                 return true;
 160         }
 161
 162         return false;
 163 }
 164
 165 static inline u8 smp_ltk_sec_level(struct smp_ltk *key)
 166 {
 167         if (key->authenticated) {
 168                 if (smp_ltk_is_sc(key))
 169                         return BT_SECURITY_FIPS;
 170                 else
 171                         return BT_SECURITY_HIGH;
 172         }
 173
 174         return BT_SECURITY_MEDIUM;
 175 }
 176
 177 /* Key preferences for smp_sufficient security */
 178 enum smp_key_pref {
 179         SMP_ALLOW_STK,
 180         SMP_USE_LTK,
 181 };
 182
 183 /* SMP Commands */
 184 void smp_cancel_pairing(struct hci_conn *hcon);
 185 bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level,
 186                              enum smp_key_pref key_pref);
 187 int smp_conn_security(struct hci_conn *hcon, __u8 sec_level);
 188 int smp_user_confirm_reply(struct hci_conn *conn, u16 mgmt_op, __le32 passkey);
 189
 190 bool smp_irk_matches(struct hci_dev *hdev, const u8 irk[16],
 191                      const bdaddr_t *bdaddr);
 192 int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa);
 193 int smp_generate_oob(struct hci_dev *hdev, u8 hash[16], u8 rand[16]);
 194
 195 int smp_register(struct hci_dev *hdev);
 196 void smp_unregister(struct hci_dev *hdev);
 197
 198 #if IS_ENABLED(CONFIG_BT_SELFTEST_SMP)
 199
 200 int bt_selftest_smp(void);
 201
 202 #else
 203
 204 static inline int bt_selftest_smp(void)
 205 {
 206         return 0;
 207 }
 208
 209 #endif
 210
 211 #endif /* __SMP_H */