hw/tpm/tpm_ioctl.h

   1 /*
   2  * tpm_ioctl.h
   3  *
   4  * (c) Copyright IBM Corporation 2014, 2015.
   5  *
   6  * This file is licensed under the terms of the 3-clause BSD license
   7  */
   8 #ifndef _TPM_IOCTL_H_
   9 #define _TPM_IOCTL_H_
  10
  11 #include <stdint.h>
  12 #include <sys/uio.h>
  13 #include <sys/types.h>
  14 #include <sys/ioctl.h>
  15
  16 /*
  17  * Every response from a command involving a TPM command execution must hold
  18  * the ptm_res as the first element.
  19  * ptm_res corresponds to the error code of a command executed by the TPM.
  20  */
  21
  22 typedef uint32_t ptm_res;
  23
  24 /* PTM_GET_TPMESTABLISHED: get the establishment bit */
  25 struct ptm_est {
  26     union {
  27         struct {
  28             ptm_res tpm_result;
  29             unsigned char bit; /* TPM established bit */
  30         } resp; /* response */
  31     } u;
  32 };
  33
  34 /* PTM_RESET_TPMESTABLISHED: reset establishment bit */
  35 struct ptm_reset_est {
  36     union {
  37         struct {
  38             uint8_t loc; /* locality to use */
  39         } req; /* request */
  40         struct {
  41             ptm_res tpm_result;
  42         } resp; /* response */
  43     } u;
  44 };
  45
  46 /* PTM_INIT */
  47 struct ptm_init {
  48     union {
  49         struct {
  50             uint32_t init_flags; /* see definitions below */
  51         } req; /* request */
  52         struct {
  53             ptm_res tpm_result;
  54         } resp; /* response */
  55     } u;
  56 };
  57
  58 /* above init_flags */
  59 #define PTM_INIT_FLAG_DELETE_VOLATILE (1 << 0)
  60     /* delete volatile state file after reading it */
  61
  62 /* PTM_SET_LOCALITY */
  63 struct ptm_loc {
  64     union {
  65         struct {
  66             uint8_t loc; /* locality to set */
  67         } req; /* request */
  68         struct {
  69             ptm_res tpm_result;
  70         } resp; /* response */
  71     } u;
  72 };
  73
  74 /* PTM_HASH_DATA: hash given data */
  75 struct ptm_hdata {
  76     union {
  77         struct {
  78             uint32_t length;
  79             uint8_t data[4096];
  80         } req; /* request */
  81         struct {
  82             ptm_res tpm_result;
  83         } resp; /* response */
  84     } u;
  85 };
  86
  87 /*
  88  * size of the TPM state blob to transfer; x86_64 can handle 8k,
  89  * ppc64le only ~7k; keep the response below a 4k page size
  90  */
  91 #define PTM_STATE_BLOB_SIZE (3 * 1024)
  92
  93 /*
  94  * The following is the data structure to get state blobs from the TPM.
  95  * If the size of the state blob exceeds the PTM_STATE_BLOB_SIZE, multiple reads
  96  * with this ioctl and with adjusted offset are necessary. All bytes
  97  * must be transferred and the transfer is done once the last byte has been
  98  * returned.
  99  * It is possible to use the read() interface for reading the data; however, the
 100  * first bytes of the state blob will be part of the response to the ioctl(); a
 101  * subsequent read() is only necessary if the total length (totlength) exceeds
 102  * the number of received bytes. seek() is not supported.
 103  */
 104 struct ptm_getstate {
 105     union {
 106         struct {
 107             uint32_t state_flags; /* may be: PTM_STATE_FLAG_DECRYPTED */
 108             uint32_t type;        /* which blob to pull */
 109             uint32_t offset;      /* offset from where to read */
 110         } req; /* request */
 111         struct {
 112             ptm_res tpm_result;
 113             uint32_t state_flags; /* may be: PTM_STATE_FLAG_ENCRYPTED */
 114             uint32_t totlength;   /* total length that will be transferred */
 115             uint32_t length;      /* number of bytes in following buffer */
 116             uint8_t  data[PTM_STATE_BLOB_SIZE];
 117         } resp; /* response */
 118     } u;
 119 };
 120
 121 /* TPM state blob types */
 122 #define PTM_BLOB_TYPE_PERMANENT  1
 123 #define PTM_BLOB_TYPE_VOLATILE   2
 124 #define PTM_BLOB_TYPE_SAVESTATE  3
 125
 126 /* state_flags above : */
 127 #define PTM_STATE_FLAG_DECRYPTED     1 /* on input:  get decrypted state */
 128 #define PTM_STATE_FLAG_ENCRYPTED     2 /* on output: state is encrypted */
 129
 130 /*
 131  * The following is the data structure to set state blobs in the TPM.
 132  * If the size of the state blob exceeds the PTM_STATE_BLOB_SIZE, multiple
 133  * 'writes' using this ioctl are necessary. The last packet is indicated
 134  * by the length being smaller than the PTM_STATE_BLOB_SIZE.
 135  * The very first packet may have a length indicator of '0' enabling
 136  * a write() with all the bytes from a buffer. If the write() interface
 137  * is used, a final ioctl with a non-full buffer must be made to indicate
 138  * that all data were transferred (a write with 0 bytes would not work).
 139  */
 140 struct ptm_setstate {
 141     union {
 142         struct {
 143             uint32_t state_flags; /* may be PTM_STATE_FLAG_ENCRYPTED */
 144             uint32_t type;        /* which blob to set */
 145             uint32_t length;      /* length of the data;
 146                                      use 0 on the first packet to
 147                                      transfer using write() */
 148             uint8_t data[PTM_STATE_BLOB_SIZE];
 149         } req; /* request */
 150         struct {
 151             ptm_res tpm_result;
 152         } resp; /* response */
 153     } u;
 154 };
 155
 156 /*
 157  * PTM_GET_CONFIG: Data structure to get runtime configuration information
 158  * such as which keys are applied.
 159  */
 160 struct ptm_getconfig {
 161     union {
 162         struct {
 163             ptm_res tpm_result;
 164             uint32_t flags;
 165         } resp; /* response */
 166     } u;
 167 };
 168
 169 #define PTM_CONFIG_FLAG_FILE_KEY        0x1
 170 #define PTM_CONFIG_FLAG_MIGRATION_KEY   0x2
 171
 172 /*
 173  * PTM_SET_BUFFERSIZE: Set the buffer size to be used by the TPM.
 174  * A 0 on input queries for the current buffer size. Any other
 175  * number will try to set the buffer size. The returned number is
 176  * the buffer size that will be used, which can be larger than the
 177  * requested one, if it was below the minimum, or smaller than the
 178  * requested one, if it was above the maximum.
 179  */
 180 struct ptm_setbuffersize {
 181     union {
 182         struct {
 183             uint32_t buffersize; /* 0 to query for current buffer size */
 184         } req; /* request */
 185         struct {
 186             ptm_res tpm_result;
 187             uint32_t buffersize; /* buffer size in use */
 188             uint32_t minsize; /* min. supported buffer size */
 189             uint32_t maxsize; /* max. supported buffer size */
 190         } resp; /* response */
 191     } u;
 192 };
 193
 194
 195 typedef uint64_t ptm_cap;
 196 typedef struct ptm_est ptm_est;
 197 typedef struct ptm_reset_est ptm_reset_est;
 198 typedef struct ptm_loc ptm_loc;
 199 typedef struct ptm_hdata ptm_hdata;
 200 typedef struct ptm_init ptm_init;
 201 typedef struct ptm_getstate ptm_getstate;
 202 typedef struct ptm_setstate ptm_setstate;
 203 typedef struct ptm_getconfig ptm_getconfig;
 204 typedef struct ptm_setbuffersize ptm_setbuffersize;
 205
 206 /* capability flags returned by PTM_GET_CAPABILITY */
 207 #define PTM_CAP_INIT               (1)
 208 #define PTM_CAP_SHUTDOWN           (1 << 1)
 209 #define PTM_CAP_GET_TPMESTABLISHED (1 << 2)
 210 #define PTM_CAP_SET_LOCALITY       (1 << 3)
 211 #define PTM_CAP_HASHING            (1 << 4)
 212 #define PTM_CAP_CANCEL_TPM_CMD     (1 << 5)
 213 #define PTM_CAP_STORE_VOLATILE     (1 << 6)
 214 #define PTM_CAP_RESET_TPMESTABLISHED (1 << 7)
 215 #define PTM_CAP_GET_STATEBLOB      (1 << 8)
 216 #define PTM_CAP_SET_STATEBLOB      (1 << 9)
 217 #define PTM_CAP_STOP               (1 << 10)
 218 #define PTM_CAP_GET_CONFIG         (1 << 11)
 219 #define PTM_CAP_SET_DATAFD         (1 << 12)
 220 #define PTM_CAP_SET_BUFFERSIZE     (1 << 13)
 221
 222 enum {
 223     PTM_GET_CAPABILITY     = _IOR('P', 0, ptm_cap),
 224     PTM_INIT               = _IOWR('P', 1, ptm_init),
 225     PTM_SHUTDOWN           = _IOR('P', 2, ptm_res),
 226     PTM_GET_TPMESTABLISHED = _IOR('P', 3, ptm_est),
 227     PTM_SET_LOCALITY       = _IOWR('P', 4, ptm_loc),
 228     PTM_HASH_START         = _IOR('P', 5, ptm_res),
 229     PTM_HASH_DATA          = _IOWR('P', 6, ptm_hdata),
 230     PTM_HASH_END           = _IOR('P', 7, ptm_res),
 231     PTM_CANCEL_TPM_CMD     = _IOR('P', 8, ptm_res),
 232     PTM_STORE_VOLATILE     = _IOR('P', 9, ptm_res),
 233     PTM_RESET_TPMESTABLISHED = _IOWR('P', 10, ptm_reset_est),
 234     PTM_GET_STATEBLOB      = _IOWR('P', 11, ptm_getstate),
 235     PTM_SET_STATEBLOB      = _IOWR('P', 12, ptm_setstate),
 236     PTM_STOP               = _IOR('P', 13, ptm_res),
 237     PTM_GET_CONFIG         = _IOR('P', 14, ptm_getconfig),
 238     PTM_SET_DATAFD         = _IOR('P', 15, ptm_res),
 239     PTM_SET_BUFFERSIZE     = _IOWR('P', 16, ptm_setbuffersize),
 240 };
 241
 242 /*
 243  * Commands used by the non-CUSE TPMs
 244  *
 245  * All messages container big-endian data.
 246  *
 247  * The return messages only contain the 'resp' part of the unions
 248  * in the data structures above. Besides that the limits in the
 249  * buffers above (ptm_hdata:u.req.data and ptm_get_state:u.resp.data
 250  * and ptm_set_state:u.req.data) are 0xffffffff.
 251  */
 252 enum {
 253     CMD_GET_CAPABILITY = 1,
 254     CMD_INIT,
 255     CMD_SHUTDOWN,
 256     CMD_GET_TPMESTABLISHED,
 257     CMD_SET_LOCALITY,
 258     CMD_HASH_START,
 259     CMD_HASH_DATA,
 260     CMD_HASH_END,
 261     CMD_CANCEL_TPM_CMD,
 262     CMD_STORE_VOLATILE,
 263     CMD_RESET_TPMESTABLISHED,
 264     CMD_GET_STATEBLOB,
 265     CMD_SET_STATEBLOB,
 266     CMD_STOP,
 267     CMD_GET_CONFIG,
 268     CMD_SET_DATAFD,
 269     CMD_SET_BUFFERSIZE,
 270 };
 271
 272 #endif /* _TPM_IOCTL_H */