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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2004,2007,2008 IBM Corporation
*
* Authors:
* Leendert van Doorn <[email protected]>
* Dave Safford <[email protected]>
* Reiner Sailer <[email protected]>
* Kylene Hall <[email protected]>
* Debora Velarde <[email protected]>
*
* Maintained by: <[email protected]>
*
* Device driver for TCG/TCPA TPM (trusted platform module).
* Specifications at www.trustedcomputinggroup.org
*/
#ifndef __LINUX_TPM_H__
#define __LINUX_TPM_H__
#include <linux/hw_random.h>
#include <linux/acpi.h>
#include <linux/cdev.h>
#include <linux/fs.h>
#include <linux/highmem.h>
#include <crypto/hash_info.h>
#define TPM_DIGEST_SIZE 20 /* Max TPM v1.2 PCR size */
#define TPM_MAX_DIGEST_SIZE SHA512_DIGEST_SIZE
struct tpm_chip;
struct trusted_key_payload;
struct trusted_key_options;
/* if you add a new hash to this, increment TPM_MAX_HASHES below */
enum tpm_algorithms {
TPM_ALG_ERROR = 0x0000,
TPM_ALG_SHA1 = 0x0004,
TPM_ALG_KEYEDHASH = 0x0008,
TPM_ALG_SHA256 = 0x000B,
TPM_ALG_SHA384 = 0x000C,
TPM_ALG_SHA512 = 0x000D,
TPM_ALG_NULL = 0x0010,
TPM_ALG_SM3_256 = 0x0012,
};
/*
* maximum number of hashing algorithms a TPM can have. This is
* basically a count of every hash in tpm_algorithms above
*/
#define TPM_MAX_HASHES 5
struct tpm_digest {
u16 alg_id;
u8 digest[TPM_MAX_DIGEST_SIZE];
} __packed;
struct tpm_bank_info {
u16 alg_id;
u16 digest_size;
u16 crypto_id;
};
enum TPM_OPS_FLAGS {
TPM_OPS_AUTO_STARTUP = BIT(0),
};
struct tpm_class_ops {
unsigned int flags;
const u8 req_complete_mask;
const u8 req_complete_val;
bool (*req_canceled)(struct tpm_chip *chip, u8 status);
int (*recv) (struct tpm_chip *chip, u8 *buf, size_t len);
int (*send) (struct tpm_chip *chip, u8 *buf, size_t len);
void (*cancel) (struct tpm_chip *chip);
u8 (*status) (struct tpm_chip *chip);
void (*update_timeouts)(struct tpm_chip *chip,
unsigned long *timeout_cap);
void (*update_durations)(struct tpm_chip *chip,
unsigned long *duration_cap);
int (*go_idle)(struct tpm_chip *chip);
int (*cmd_ready)(struct tpm_chip *chip);
int (*request_locality)(struct tpm_chip *chip, int loc);
int (*relinquish_locality)(struct tpm_chip *chip, int loc);
void (*clk_enable)(struct tpm_chip *chip, bool value);
};
#define TPM_NUM_EVENT_LOG_FILES 3
/* Indexes the duration array */
enum tpm_duration {
TPM_SHORT = 0,
TPM_MEDIUM = 1,
TPM_LONG = 2,
TPM_LONG_LONG = 3,
TPM_UNDEFINED,
TPM_NUM_DURATIONS = TPM_UNDEFINED,
};
#define TPM_PPI_VERSION_LEN 3
struct tpm_space {
u32 context_tbl[3];
u8 *context_buf;
u32 session_tbl[3];
u8 *session_buf;
u32 buf_size;
};
struct tpm_bios_log {
void *bios_event_log;
void *bios_event_log_end;
};
struct tpm_chip_seqops {
struct tpm_chip *chip;
const struct seq_operations *seqops;
};
struct tpm_chip {
struct device dev;
struct device devs;
struct cdev cdev;
struct cdev cdevs;
/* A driver callback under ops cannot be run unless ops_sem is held
* (sometimes implicitly, eg for the sysfs code). ops becomes null
* when the driver is unregistered, see tpm_try_get_ops.
*/
struct rw_semaphore ops_sem;
const struct tpm_class_ops *ops;
struct tpm_bios_log log;
struct tpm_chip_seqops bin_log_seqops;
struct tpm_chip_seqops ascii_log_seqops;
unsigned int flags;
int dev_num; /* /dev/tpm# */
unsigned long is_open; /* only one allowed */
char hwrng_name[64];
struct hwrng hwrng;
struct mutex tpm_mutex; /* tpm is processing */
unsigned long timeout_a; /* jiffies */
unsigned long timeout_b; /* jiffies */
unsigned long timeout_c; /* jiffies */
unsigned long timeout_d; /* jiffies */
bool timeout_adjusted;
unsigned long duration[TPM_NUM_DURATIONS]; /* jiffies */
bool duration_adjusted;
struct dentry *bios_dir[TPM_NUM_EVENT_LOG_FILES];
const struct attribute_group *groups[3 + TPM_MAX_HASHES];
unsigned int groups_cnt;
u32 nr_allocated_banks;
struct tpm_bank_info *allocated_banks;
#ifdef CONFIG_ACPI
acpi_handle acpi_dev_handle;
char ppi_version[TPM_PPI_VERSION_LEN + 1];
#endif /* CONFIG_ACPI */
struct tpm_space work_space;
u32 last_cc;
u32 nr_commands;
u32 *cc_attrs_tbl;
/* active locality */
int locality;
};
#define TPM_HEADER_SIZE 10
enum tpm2_const {
TPM2_PLATFORM_PCR = 24,
TPM2_PCR_SELECT_MIN = ((TPM2_PLATFORM_PCR + 7) / 8),
};
enum tpm2_timeouts {
TPM2_TIMEOUT_A = 750,
TPM2_TIMEOUT_B = 2000,
TPM2_TIMEOUT_C = 200,
TPM2_TIMEOUT_D = 30,
TPM2_DURATION_SHORT = 20,
TPM2_DURATION_MEDIUM = 750,
TPM2_DURATION_LONG = 2000,
TPM2_DURATION_LONG_LONG = 300000,
TPM2_DURATION_DEFAULT = 120000,
};
enum tpm2_structures {
TPM2_ST_NO_SESSIONS = 0x8001,
TPM2_ST_SESSIONS = 0x8002,
};
/* Indicates from what layer of the software stack the error comes from */
#define TSS2_RC_LAYER_SHIFT 16
#define TSS2_RESMGR_TPM_RC_LAYER (11 << TSS2_RC_LAYER_SHIFT)
enum tpm2_return_codes {
TPM2_RC_SUCCESS = 0x0000,
TPM2_RC_HASH = 0x0083, /* RC_FMT1 */
TPM2_RC_HANDLE = 0x008B,
TPM2_RC_INITIALIZE = 0x0100, /* RC_VER1 */
TPM2_RC_FAILURE = 0x0101,
TPM2_RC_DISABLED = 0x0120,
TPM2_RC_COMMAND_CODE = 0x0143,
TPM2_RC_TESTING = 0x090A, /* RC_WARN */
TPM2_RC_REFERENCE_H0 = 0x0910,
TPM2_RC_RETRY = 0x0922,
};
enum tpm2_command_codes {
TPM2_CC_FIRST = 0x011F,
TPM2_CC_HIERARCHY_CONTROL = 0x0121,
TPM2_CC_HIERARCHY_CHANGE_AUTH = 0x0129,
TPM2_CC_CREATE_PRIMARY = 0x0131,
TPM2_CC_SEQUENCE_COMPLETE = 0x013E,
TPM2_CC_SELF_TEST = 0x0143,
TPM2_CC_STARTUP = 0x0144,
TPM2_CC_SHUTDOWN = 0x0145,
TPM2_CC_NV_READ = 0x014E,
TPM2_CC_CREATE = 0x0153,
TPM2_CC_LOAD = 0x0157,
TPM2_CC_SEQUENCE_UPDATE = 0x015C,
TPM2_CC_UNSEAL = 0x015E,
TPM2_CC_CONTEXT_LOAD = 0x0161,
TPM2_CC_CONTEXT_SAVE = 0x0162,
TPM2_CC_FLUSH_CONTEXT = 0x0165,
TPM2_CC_VERIFY_SIGNATURE = 0x0177,
TPM2_CC_GET_CAPABILITY = 0x017A,
TPM2_CC_GET_RANDOM = 0x017B,
TPM2_CC_PCR_READ = 0x017E,
TPM2_CC_PCR_EXTEND = 0x0182,
TPM2_CC_EVENT_SEQUENCE_COMPLETE = 0x0185,
TPM2_CC_HASH_SEQUENCE_START = 0x0186,
TPM2_CC_CREATE_LOADED = 0x0191,
TPM2_CC_LAST = 0x0193, /* Spec 1.36 */
};
enum tpm2_permanent_handles {
TPM2_RS_PW = 0x40000009,
};
enum tpm2_capabilities {
TPM2_CAP_HANDLES = 1,
TPM2_CAP_COMMANDS = 2,
TPM2_CAP_PCRS = 5,
TPM2_CAP_TPM_PROPERTIES = 6,
};
enum tpm2_properties {
TPM_PT_TOTAL_COMMANDS = 0x0129,
};
enum tpm2_startup_types {
TPM2_SU_CLEAR = 0x0000,
TPM2_SU_STATE = 0x0001,
};
enum tpm2_cc_attrs {
TPM2_CC_ATTR_CHANDLES = 25,
TPM2_CC_ATTR_RHANDLE = 28,
};
#define TPM_VID_INTEL 0x8086
#define TPM_VID_WINBOND 0x1050
#define TPM_VID_STM 0x104A
#define TPM_VID_ATML 0x1114
enum tpm_chip_flags {
TPM_CHIP_FLAG_TPM2 = BIT(1),
TPM_CHIP_FLAG_IRQ = BIT(2),
TPM_CHIP_FLAG_VIRTUAL = BIT(3),
TPM_CHIP_FLAG_HAVE_TIMEOUTS = BIT(4),
TPM_CHIP_FLAG_ALWAYS_POWERED = BIT(5),
TPM_CHIP_FLAG_FIRMWARE_POWER_MANAGED = BIT(6),
};
#define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)
struct tpm_header {
__be16 tag;
__be32 length;
union {
__be32 ordinal;
__be32 return_code;
};
} __packed;
/* A string buffer type for constructing TPM commands. This is based on the
* ideas of string buffer code in security/keys/trusted.h but is heap based
* in order to keep the stack usage minimal.
*/
enum tpm_buf_flags {
TPM_BUF_OVERFLOW = BIT(0),
};
struct tpm_buf {
unsigned int flags;
u8 *data;
};
enum tpm2_object_attributes {
TPM2_OA_FIXED_TPM = BIT(1),
TPM2_OA_FIXED_PARENT = BIT(4),
TPM2_OA_USER_WITH_AUTH = BIT(6),
};
enum tpm2_session_attributes {
TPM2_SA_CONTINUE_SESSION = BIT(0),
};
struct tpm2_hash {
unsigned int crypto_id;
unsigned int tpm_id;
};
static inline void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal)
{
struct tpm_header *head = (struct tpm_header *)buf->data;
head->tag = cpu_to_be16(tag);
head->length = cpu_to_be32(sizeof(*head));
head->ordinal = cpu_to_be32(ordinal);
}
static inline int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal)
{
buf->data = (u8 *)__get_free_page(GFP_KERNEL);
if (!buf->data)
return -ENOMEM;
buf->flags = 0;
tpm_buf_reset(buf, tag, ordinal);
return 0;
}
static inline void tpm_buf_destroy(struct tpm_buf *buf)
{
free_page((unsigned long)buf->data);
}
static inline u32 tpm_buf_length(struct tpm_buf *buf)
{
struct tpm_header *head = (struct tpm_header *)buf->data;
return be32_to_cpu(head->length);
}
static inline u16 tpm_buf_tag(struct tpm_buf *buf)
{
struct tpm_header *head = (struct tpm_header *)buf->data;
return be16_to_cpu(head->tag);
}
static inline void tpm_buf_append(struct tpm_buf *buf,
const unsigned char *new_data,
unsigned int new_len)
{
struct tpm_header *head = (struct tpm_header *)buf->data;
u32 len = tpm_buf_length(buf);
/* Return silently if overflow has already happened. */
if (buf->flags & TPM_BUF_OVERFLOW)
return;
if ((len + new_len) > PAGE_SIZE) {
WARN(1, "tpm_buf: overflow\n");
buf->flags |= TPM_BUF_OVERFLOW;
return;
}
memcpy(&buf->data[len], new_data, new_len);
head->length = cpu_to_be32(len + new_len);
}
static inline void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value)
{
tpm_buf_append(buf, &value, 1);
}
static inline void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value)
{
__be16 value2 = cpu_to_be16(value);
tpm_buf_append(buf, (u8 *) &value2, 2);
}
static inline void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value)
{
__be32 value2 = cpu_to_be32(value);
tpm_buf_append(buf, (u8 *) &value2, 4);
}
static inline u32 tpm2_rc_value(u32 rc)
{
return (rc & BIT(7)) ? rc & 0xff : rc;
}
#if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
extern int tpm_is_tpm2(struct tpm_chip *chip);
extern __must_check int tpm_try_get_ops(struct tpm_chip *chip);
extern void tpm_put_ops(struct tpm_chip *chip);
extern ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_buf *buf,
size_t min_rsp_body_length, const char *desc);
extern int tpm_pcr_read(struct tpm_chip *chip, u32 pcr_idx,
struct tpm_digest *digest);
extern int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
struct tpm_digest *digests);
extern int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen);
extern int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max);
extern struct tpm_chip *tpm_default_chip(void);
void tpm2_flush_context(struct tpm_chip *chip, u32 handle);
#else
static inline int tpm_is_tpm2(struct tpm_chip *chip)
{
return -ENODEV;
}
static inline int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx,
struct tpm_digest *digest)
{
return -ENODEV;
}
static inline int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
struct tpm_digest *digests)
{
return -ENODEV;
}
static inline int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen)
{
return -ENODEV;
}
static inline int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max)
{
return -ENODEV;
}
static inline struct tpm_chip *tpm_default_chip(void)
{
return NULL;
}
#endif
#endif
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