/*
* tpm_ioctl.h
*
* (c) Copyright IBM Corporation 2014, 2015.
*
* This file is licensed under the terms of the 3-clause BSD license
*/
#ifndef TPM_IOCTL_H
#define TPM_IOCTL_H
#include <sys/uio.h>
#include <sys/ioctl.h>
/*
* Every response from a command involving a TPM command execution must hold
* the ptm_res as the first element.
* ptm_res corresponds to the error code of a command executed by the TPM.
*/
typedef uint32_t ptm_res;
/* PTM_GET_TPMESTABLISHED: get the establishment bit */
struct ptm_est {
union {
struct {
ptm_res tpm_result;
unsigned char bit; /* TPM established bit */
} resp; /* response */
} u;
};
/* PTM_RESET_TPMESTABLISHED: reset establishment bit */
struct ptm_reset_est {
union {
struct {
uint8_t loc; /* locality to use */
} req; /* request */
struct {
ptm_res tpm_result;
} resp; /* response */
} u;
};
/* PTM_INIT */
struct ptm_init {
union {
struct {
uint32_t init_flags; /* see definitions below */
} req; /* request */
struct {
ptm_res tpm_result;
} resp; /* response */
} u;
};
/* above init_flags */
#define PTM_INIT_FLAG_DELETE_VOLATILE (1 << 0)
/* delete volatile state file after reading it */
/* PTM_SET_LOCALITY */
struct ptm_loc {
union {
struct {
uint8_t loc; /* locality to set */
} req; /* request */
struct {
ptm_res tpm_result;
} resp; /* response */
} u;
};
/* PTM_HASH_DATA: hash given data */
struct ptm_hdata {
union {
struct {
uint32_t length;
uint8_t data[4096];
} req; /* request */
struct {
ptm_res tpm_result;
} resp; /* response */
} u;
};
/*
* size of the TPM state blob to transfer; x86_64 can handle 8k,
* ppc64le only ~7k; keep the response below a 4k page size
*/
#define PTM_STATE_BLOB_SIZE (3 * 1024)
/*
* The following is the data structure to get state blobs from the TPM.
* If the size of the state blob exceeds the PTM_STATE_BLOB_SIZE, multiple reads
* with this ioctl and with adjusted offset are necessary. All bytes
* must be transferred and the transfer is done once the last byte has been
* returned.
* It is possible to use the read() interface for reading the data; however, the
* first bytes of the state blob will be part of the response to the ioctl(); a
* subsequent read() is only necessary if the total length (totlength) exceeds
* the number of received bytes. seek() is not supported.
*/
struct ptm_getstate {
union {
struct {
uint32_t state_flags; /* may be: PTM_STATE_FLAG_DECRYPTED */
uint32_t type; /* which blob to pull */
uint32_t offset; /* offset from where to read */
} req; /* request */
struct {
ptm_res tpm_result;
uint32_t state_flags; /* may be: PTM_STATE_FLAG_ENCRYPTED */
uint32_t totlength; /* total length that will be transferred */
uint32_t length; /* number of bytes in following buffer */
uint8_t data[PTM_STATE_BLOB_SIZE];
} resp; /* response */
} u;
};
/* TPM state blob types */
#define PTM_BLOB_TYPE_PERMANENT 1
#define PTM_BLOB_TYPE_VOLATILE 2
#define PTM_BLOB_TYPE_SAVESTATE 3
/* state_flags above : */
#define PTM_STATE_FLAG_DECRYPTED 1 /* on input: get decrypted state */
#define PTM_STATE_FLAG_ENCRYPTED 2 /* on output: state is encrypted */
/*
* The following is the data structure to set state blobs in the TPM.
* If the size of the state blob exceeds the PTM_STATE_BLOB_SIZE, multiple
* 'writes' using this ioctl are necessary. The last packet is indicated
* by the length being smaller than the PTM_STATE_BLOB_SIZE.
* The very first packet may have a length indicator of '0' enabling
* a write() with all the bytes from a buffer. If the write() interface
* is used, a final ioctl with a non-full buffer must be made to indicate
* that all data were transferred (a write with 0 bytes would not work).
*/
struct ptm_setstate {
union {
struct {
uint32_t state_flags; /* may be PTM_STATE_FLAG_ENCRYPTED */
uint32_t type; /* which blob to set */
uint32_t length; /* length of the data;
use 0 on the first packet to
transfer using write() */
uint8_t data[PTM_STATE_BLOB_SIZE];
} req; /* request */
struct {
ptm_res tpm_result;
} resp; /* response */
} u;
};
/*
* PTM_GET_CONFIG: Data structure to get runtime configuration information
* such as which keys are applied.
*/
struct ptm_getconfig {
union {
struct {
ptm_res tpm_result;
uint32_t flags;
} resp; /* response */
} u;
};
#define PTM_CONFIG_FLAG_FILE_KEY 0x1
#define PTM_CONFIG_FLAG_MIGRATION_KEY 0x2
/*
* PTM_SET_BUFFERSIZE: Set the buffer size to be used by the TPM.
* A 0 on input queries for the current buffer size. Any other
* number will try to set the buffer size. The returned number is
* the buffer size that will be used, which can be larger than the
* requested one, if it was below the minimum, or smaller than the
* requested one, if it was above the maximum.
*/
struct ptm_setbuffersize {
union {
struct {
uint32_t buffersize; /* 0 to query for current buffer size */
} req; /* request */
struct {
ptm_res tpm_result;
uint32_t buffersize; /* buffer size in use */
uint32_t minsize; /* min. supported buffer size */
uint32_t maxsize; /* max. supported buffer size */
} resp; /* response */
} u;
};
typedef uint64_t ptm_cap;
typedef struct ptm_est ptm_est;
typedef struct ptm_reset_est ptm_reset_est;
typedef struct ptm_loc ptm_loc;
typedef struct ptm_hdata ptm_hdata;
typedef struct ptm_init ptm_init;
typedef struct ptm_getstate ptm_getstate;
typedef struct ptm_setstate ptm_setstate;
typedef struct ptm_getconfig ptm_getconfig;
typedef struct ptm_setbuffersize ptm_setbuffersize;
/* capability flags returned by PTM_GET_CAPABILITY */
#define PTM_CAP_INIT (1)
#define PTM_CAP_SHUTDOWN (1 << 1)
#define PTM_CAP_GET_TPMESTABLISHED (1 << 2)
#define PTM_CAP_SET_LOCALITY (1 << 3)
#define PTM_CAP_HASHING (1 << 4)
#define PTM_CAP_CANCEL_TPM_CMD (1 << 5)
#define PTM_CAP_STORE_VOLATILE (1 << 6)
#define PTM_CAP_RESET_TPMESTABLISHED (1 << 7)
#define PTM_CAP_GET_STATEBLOB (1 << 8)
#define PTM_CAP_SET_STATEBLOB (1 << 9)
#define PTM_CAP_STOP (1 << 10)
#define PTM_CAP_GET_CONFIG (1 << 11)
#define PTM_CAP_SET_DATAFD (1 << 12)
#define PTM_CAP_SET_BUFFERSIZE (1 << 13)
enum {
PTM_GET_CAPABILITY = _IOR('P', 0, ptm_cap),
PTM_INIT = _IOWR('P', 1, ptm_init),
PTM_SHUTDOWN = _IOR('P', 2, ptm_res),
PTM_GET_TPMESTABLISHED = _IOR('P', 3, ptm_est),
PTM_SET_LOCALITY = _IOWR('P', 4, ptm_loc),
PTM_HASH_START = _IOR('P', 5, ptm_res),
PTM_HASH_DATA = _IOWR('P', 6, ptm_hdata),
PTM_HASH_END = _IOR('P', 7, ptm_res),
PTM_CANCEL_TPM_CMD = _IOR('P', 8, ptm_res),
PTM_STORE_VOLATILE = _IOR('P', 9, ptm_res),
PTM_RESET_TPMESTABLISHED = _IOWR('P', 10, ptm_reset_est),
PTM_GET_STATEBLOB = _IOWR('P', 11, ptm_getstate),
PTM_SET_STATEBLOB = _IOWR('P', 12, ptm_setstate),
PTM_STOP = _IOR('P', 13, ptm_res),
PTM_GET_CONFIG = _IOR('P', 14, ptm_getconfig),
PTM_SET_DATAFD = _IOR('P', 15, ptm_res),
PTM_SET_BUFFERSIZE = _IOWR('P', 16, ptm_setbuffersize),
};
/*
* Commands used by the non-CUSE TPMs
*
* All messages container big-endian data.
*
* The return messages only contain the 'resp' part of the unions
* in the data structures above. Besides that the limits in the
* buffers above (ptm_hdata:u.req.data and ptm_get_state:u.resp.data
* and ptm_set_state:u.req.data) are 0xffffffff.
*/
enum {
CMD_GET_CAPABILITY = 1,
CMD_INIT,
CMD_SHUTDOWN,
CMD_GET_TPMESTABLISHED,
CMD_SET_LOCALITY,
CMD_HASH_START,
CMD_HASH_DATA,
CMD_HASH_END,
CMD_CANCEL_TPM_CMD,
CMD_STORE_VOLATILE,
CMD_RESET_TPMESTABLISHED,
CMD_GET_STATEBLOB,
CMD_SET_STATEBLOB,
CMD_STOP,
CMD_GET_CONFIG,
CMD_SET_DATAFD,
CMD_SET_BUFFERSIZE,
};
#endif /* TPM_IOCTL_H */
