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b886d83c | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
659aaf2b RA |
2 | /* |
3 | * Copyright (C) 2004,2007,2008 IBM Corporation | |
4 | * | |
5 | * Authors: | |
6 | * Leendert van Doorn <leendert@watson.ibm.com> | |
7 | * Dave Safford <safford@watson.ibm.com> | |
8 | * Reiner Sailer <sailer@watson.ibm.com> | |
9 | * Kylene Hall <kjhall@us.ibm.com> | |
10 | * Debora Velarde <dvelarde@us.ibm.com> | |
11 | * | |
12 | * Maintained by: <tpmdd_devel@lists.sourceforge.net> | |
13 | * | |
14 | * Device driver for TCG/TCPA TPM (trusted platform module). | |
15 | * Specifications at www.trustedcomputinggroup.org | |
659aaf2b RA |
16 | */ |
17 | #ifndef __LINUX_TPM_H__ | |
18 | #define __LINUX_TPM_H__ | |
19 | ||
901615cb RS |
20 | #include <linux/hw_random.h> |
21 | #include <linux/acpi.h> | |
22 | #include <linux/cdev.h> | |
23 | #include <linux/fs.h> | |
74edff2d | 24 | #include <linux/highmem.h> |
aa042475 RS |
25 | #include <crypto/hash_info.h> |
26 | ||
1c16c963 | 27 | #define TPM_DIGEST_SIZE 20 /* Max TPM v1.2 PCR size */ |
aa042475 | 28 | #define TPM_MAX_DIGEST_SIZE SHA512_DIGEST_SIZE |
1c16c963 | 29 | |
01ad1fa7 | 30 | struct tpm_chip; |
954650ef JS |
31 | struct trusted_key_payload; |
32 | struct trusted_key_options; | |
01ad1fa7 | 33 | |
aab73d95 | 34 | /* if you add a new hash to this, increment TPM_MAX_HASHES below */ |
aa042475 RS |
35 | enum tpm_algorithms { |
36 | TPM_ALG_ERROR = 0x0000, | |
37 | TPM_ALG_SHA1 = 0x0004, | |
38 | TPM_ALG_KEYEDHASH = 0x0008, | |
39 | TPM_ALG_SHA256 = 0x000B, | |
40 | TPM_ALG_SHA384 = 0x000C, | |
41 | TPM_ALG_SHA512 = 0x000D, | |
42 | TPM_ALG_NULL = 0x0010, | |
43 | TPM_ALG_SM3_256 = 0x0012, | |
44 | }; | |
45 | ||
aab73d95 JB |
46 | /* |
47 | * maximum number of hashing algorithms a TPM can have. This is | |
48 | * basically a count of every hash in tpm_algorithms above | |
49 | */ | |
50 | #define TPM_MAX_HASHES 5 | |
51 | ||
aa042475 RS |
52 | struct tpm_digest { |
53 | u16 alg_id; | |
54 | u8 digest[TPM_MAX_DIGEST_SIZE]; | |
55 | } __packed; | |
56 | ||
879b5892 RS |
57 | struct tpm_bank_info { |
58 | u16 alg_id; | |
59 | u16 digest_size; | |
60 | u16 crypto_id; | |
61 | }; | |
62 | ||
cae8b441 JG |
63 | enum TPM_OPS_FLAGS { |
64 | TPM_OPS_AUTO_STARTUP = BIT(0), | |
65 | }; | |
66 | ||
01ad1fa7 | 67 | struct tpm_class_ops { |
cae8b441 | 68 | unsigned int flags; |
01ad1fa7 JG |
69 | const u8 req_complete_mask; |
70 | const u8 req_complete_val; | |
71 | bool (*req_canceled)(struct tpm_chip *chip, u8 status); | |
72 | int (*recv) (struct tpm_chip *chip, u8 *buf, size_t len); | |
73 | int (*send) (struct tpm_chip *chip, u8 *buf, size_t len); | |
74 | void (*cancel) (struct tpm_chip *chip); | |
75 | u8 (*status) (struct tpm_chip *chip); | |
36ce0897 | 76 | void (*update_timeouts)(struct tpm_chip *chip, |
8e54caf4 | 77 | unsigned long *timeout_cap); |
15d0b22c JS |
78 | void (*update_durations)(struct tpm_chip *chip, |
79 | unsigned long *duration_cap); | |
627448e8 TW |
80 | int (*go_idle)(struct tpm_chip *chip); |
81 | int (*cmd_ready)(struct tpm_chip *chip); | |
877c57d0 | 82 | int (*request_locality)(struct tpm_chip *chip, int loc); |
888d867d | 83 | int (*relinquish_locality)(struct tpm_chip *chip, int loc); |
b3e958ce | 84 | void (*clk_enable)(struct tpm_chip *chip, bool value); |
01ad1fa7 JG |
85 | }; |
86 | ||
901615cb RS |
87 | #define TPM_NUM_EVENT_LOG_FILES 3 |
88 | ||
89 | /* Indexes the duration array */ | |
90 | enum tpm_duration { | |
91 | TPM_SHORT = 0, | |
92 | TPM_MEDIUM = 1, | |
93 | TPM_LONG = 2, | |
94 | TPM_LONG_LONG = 3, | |
95 | TPM_UNDEFINED, | |
96 | TPM_NUM_DURATIONS = TPM_UNDEFINED, | |
97 | }; | |
98 | ||
99 | #define TPM_PPI_VERSION_LEN 3 | |
100 | ||
101 | struct tpm_space { | |
102 | u32 context_tbl[3]; | |
103 | u8 *context_buf; | |
104 | u32 session_tbl[3]; | |
105 | u8 *session_buf; | |
6c4e79d9 | 106 | u32 buf_size; |
901615cb RS |
107 | }; |
108 | ||
109 | struct tpm_bios_log { | |
110 | void *bios_event_log; | |
111 | void *bios_event_log_end; | |
112 | }; | |
113 | ||
114 | struct tpm_chip_seqops { | |
115 | struct tpm_chip *chip; | |
116 | const struct seq_operations *seqops; | |
117 | }; | |
118 | ||
119 | struct tpm_chip { | |
120 | struct device dev; | |
121 | struct device devs; | |
122 | struct cdev cdev; | |
123 | struct cdev cdevs; | |
124 | ||
125 | /* A driver callback under ops cannot be run unless ops_sem is held | |
126 | * (sometimes implicitly, eg for the sysfs code). ops becomes null | |
127 | * when the driver is unregistered, see tpm_try_get_ops. | |
128 | */ | |
129 | struct rw_semaphore ops_sem; | |
130 | const struct tpm_class_ops *ops; | |
131 | ||
132 | struct tpm_bios_log log; | |
133 | struct tpm_chip_seqops bin_log_seqops; | |
134 | struct tpm_chip_seqops ascii_log_seqops; | |
135 | ||
136 | unsigned int flags; | |
137 | ||
138 | int dev_num; /* /dev/tpm# */ | |
139 | unsigned long is_open; /* only one allowed */ | |
140 | ||
141 | char hwrng_name[64]; | |
142 | struct hwrng hwrng; | |
143 | ||
144 | struct mutex tpm_mutex; /* tpm is processing */ | |
145 | ||
146 | unsigned long timeout_a; /* jiffies */ | |
147 | unsigned long timeout_b; /* jiffies */ | |
148 | unsigned long timeout_c; /* jiffies */ | |
149 | unsigned long timeout_d; /* jiffies */ | |
150 | bool timeout_adjusted; | |
151 | unsigned long duration[TPM_NUM_DURATIONS]; /* jiffies */ | |
152 | bool duration_adjusted; | |
153 | ||
154 | struct dentry *bios_dir[TPM_NUM_EVENT_LOG_FILES]; | |
155 | ||
aab73d95 | 156 | const struct attribute_group *groups[3 + TPM_MAX_HASHES]; |
901615cb RS |
157 | unsigned int groups_cnt; |
158 | ||
159 | u32 nr_allocated_banks; | |
160 | struct tpm_bank_info *allocated_banks; | |
161 | #ifdef CONFIG_ACPI | |
162 | acpi_handle acpi_dev_handle; | |
163 | char ppi_version[TPM_PPI_VERSION_LEN + 1]; | |
164 | #endif /* CONFIG_ACPI */ | |
165 | ||
166 | struct tpm_space work_space; | |
167 | u32 last_cc; | |
168 | u32 nr_commands; | |
169 | u32 *cc_attrs_tbl; | |
170 | ||
171 | /* active locality */ | |
172 | int locality; | |
173 | }; | |
174 | ||
74edff2d SG |
175 | #define TPM_HEADER_SIZE 10 |
176 | ||
177 | enum tpm2_const { | |
178 | TPM2_PLATFORM_PCR = 24, | |
179 | TPM2_PCR_SELECT_MIN = ((TPM2_PLATFORM_PCR + 7) / 8), | |
180 | }; | |
181 | ||
182 | enum tpm2_timeouts { | |
183 | TPM2_TIMEOUT_A = 750, | |
184 | TPM2_TIMEOUT_B = 2000, | |
185 | TPM2_TIMEOUT_C = 200, | |
186 | TPM2_TIMEOUT_D = 30, | |
187 | TPM2_DURATION_SHORT = 20, | |
188 | TPM2_DURATION_MEDIUM = 750, | |
189 | TPM2_DURATION_LONG = 2000, | |
190 | TPM2_DURATION_LONG_LONG = 300000, | |
191 | TPM2_DURATION_DEFAULT = 120000, | |
192 | }; | |
193 | ||
194 | enum tpm2_structures { | |
195 | TPM2_ST_NO_SESSIONS = 0x8001, | |
196 | TPM2_ST_SESSIONS = 0x8002, | |
197 | }; | |
198 | ||
199 | /* Indicates from what layer of the software stack the error comes from */ | |
200 | #define TSS2_RC_LAYER_SHIFT 16 | |
201 | #define TSS2_RESMGR_TPM_RC_LAYER (11 << TSS2_RC_LAYER_SHIFT) | |
202 | ||
203 | enum tpm2_return_codes { | |
204 | TPM2_RC_SUCCESS = 0x0000, | |
205 | TPM2_RC_HASH = 0x0083, /* RC_FMT1 */ | |
206 | TPM2_RC_HANDLE = 0x008B, | |
207 | TPM2_RC_INITIALIZE = 0x0100, /* RC_VER1 */ | |
208 | TPM2_RC_FAILURE = 0x0101, | |
209 | TPM2_RC_DISABLED = 0x0120, | |
210 | TPM2_RC_COMMAND_CODE = 0x0143, | |
211 | TPM2_RC_TESTING = 0x090A, /* RC_WARN */ | |
212 | TPM2_RC_REFERENCE_H0 = 0x0910, | |
213 | TPM2_RC_RETRY = 0x0922, | |
214 | }; | |
215 | ||
216 | enum tpm2_command_codes { | |
217 | TPM2_CC_FIRST = 0x011F, | |
218 | TPM2_CC_HIERARCHY_CONTROL = 0x0121, | |
219 | TPM2_CC_HIERARCHY_CHANGE_AUTH = 0x0129, | |
220 | TPM2_CC_CREATE_PRIMARY = 0x0131, | |
221 | TPM2_CC_SEQUENCE_COMPLETE = 0x013E, | |
222 | TPM2_CC_SELF_TEST = 0x0143, | |
223 | TPM2_CC_STARTUP = 0x0144, | |
224 | TPM2_CC_SHUTDOWN = 0x0145, | |
225 | TPM2_CC_NV_READ = 0x014E, | |
226 | TPM2_CC_CREATE = 0x0153, | |
227 | TPM2_CC_LOAD = 0x0157, | |
228 | TPM2_CC_SEQUENCE_UPDATE = 0x015C, | |
229 | TPM2_CC_UNSEAL = 0x015E, | |
230 | TPM2_CC_CONTEXT_LOAD = 0x0161, | |
231 | TPM2_CC_CONTEXT_SAVE = 0x0162, | |
232 | TPM2_CC_FLUSH_CONTEXT = 0x0165, | |
233 | TPM2_CC_VERIFY_SIGNATURE = 0x0177, | |
234 | TPM2_CC_GET_CAPABILITY = 0x017A, | |
235 | TPM2_CC_GET_RANDOM = 0x017B, | |
236 | TPM2_CC_PCR_READ = 0x017E, | |
237 | TPM2_CC_PCR_EXTEND = 0x0182, | |
238 | TPM2_CC_EVENT_SEQUENCE_COMPLETE = 0x0185, | |
239 | TPM2_CC_HASH_SEQUENCE_START = 0x0186, | |
240 | TPM2_CC_CREATE_LOADED = 0x0191, | |
241 | TPM2_CC_LAST = 0x0193, /* Spec 1.36 */ | |
242 | }; | |
243 | ||
244 | enum tpm2_permanent_handles { | |
245 | TPM2_RS_PW = 0x40000009, | |
246 | }; | |
247 | ||
248 | enum tpm2_capabilities { | |
249 | TPM2_CAP_HANDLES = 1, | |
250 | TPM2_CAP_COMMANDS = 2, | |
251 | TPM2_CAP_PCRS = 5, | |
252 | TPM2_CAP_TPM_PROPERTIES = 6, | |
253 | }; | |
254 | ||
255 | enum tpm2_properties { | |
256 | TPM_PT_TOTAL_COMMANDS = 0x0129, | |
257 | }; | |
258 | ||
259 | enum tpm2_startup_types { | |
260 | TPM2_SU_CLEAR = 0x0000, | |
261 | TPM2_SU_STATE = 0x0001, | |
262 | }; | |
263 | ||
264 | enum tpm2_cc_attrs { | |
265 | TPM2_CC_ATTR_CHANDLES = 25, | |
266 | TPM2_CC_ATTR_RHANDLE = 28, | |
267 | }; | |
268 | ||
269 | #define TPM_VID_INTEL 0x8086 | |
270 | #define TPM_VID_WINBOND 0x1050 | |
271 | #define TPM_VID_STM 0x104A | |
272 | ||
273 | enum tpm_chip_flags { | |
274 | TPM_CHIP_FLAG_TPM2 = BIT(1), | |
275 | TPM_CHIP_FLAG_IRQ = BIT(2), | |
276 | TPM_CHIP_FLAG_VIRTUAL = BIT(3), | |
277 | TPM_CHIP_FLAG_HAVE_TIMEOUTS = BIT(4), | |
278 | TPM_CHIP_FLAG_ALWAYS_POWERED = BIT(5), | |
279 | TPM_CHIP_FLAG_FIRMWARE_POWER_MANAGED = BIT(6), | |
280 | }; | |
281 | ||
282 | #define to_tpm_chip(d) container_of(d, struct tpm_chip, dev) | |
283 | ||
284 | struct tpm_header { | |
285 | __be16 tag; | |
286 | __be32 length; | |
287 | union { | |
288 | __be32 ordinal; | |
289 | __be32 return_code; | |
290 | }; | |
291 | } __packed; | |
292 | ||
293 | /* A string buffer type for constructing TPM commands. This is based on the | |
294 | * ideas of string buffer code in security/keys/trusted.h but is heap based | |
295 | * in order to keep the stack usage minimal. | |
296 | */ | |
297 | ||
298 | enum tpm_buf_flags { | |
299 | TPM_BUF_OVERFLOW = BIT(0), | |
300 | }; | |
301 | ||
302 | struct tpm_buf { | |
303 | unsigned int flags; | |
304 | u8 *data; | |
305 | }; | |
306 | ||
2e19e101 | 307 | enum tpm2_object_attributes { |
e5fb5d2c JB |
308 | TPM2_OA_FIXED_TPM = BIT(1), |
309 | TPM2_OA_FIXED_PARENT = BIT(4), | |
2e19e101 SG |
310 | TPM2_OA_USER_WITH_AUTH = BIT(6), |
311 | }; | |
312 | ||
313 | enum tpm2_session_attributes { | |
314 | TPM2_SA_CONTINUE_SESSION = BIT(0), | |
315 | }; | |
316 | ||
317 | struct tpm2_hash { | |
318 | unsigned int crypto_id; | |
319 | unsigned int tpm_id; | |
320 | }; | |
321 | ||
74edff2d SG |
322 | static inline void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal) |
323 | { | |
324 | struct tpm_header *head = (struct tpm_header *)buf->data; | |
325 | ||
326 | head->tag = cpu_to_be16(tag); | |
327 | head->length = cpu_to_be32(sizeof(*head)); | |
328 | head->ordinal = cpu_to_be32(ordinal); | |
329 | } | |
330 | ||
331 | static inline int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal) | |
332 | { | |
333 | buf->data = (u8 *)__get_free_page(GFP_KERNEL); | |
334 | if (!buf->data) | |
335 | return -ENOMEM; | |
336 | ||
337 | buf->flags = 0; | |
338 | tpm_buf_reset(buf, tag, ordinal); | |
339 | return 0; | |
340 | } | |
341 | ||
342 | static inline void tpm_buf_destroy(struct tpm_buf *buf) | |
343 | { | |
344 | free_page((unsigned long)buf->data); | |
345 | } | |
346 | ||
347 | static inline u32 tpm_buf_length(struct tpm_buf *buf) | |
348 | { | |
349 | struct tpm_header *head = (struct tpm_header *)buf->data; | |
350 | ||
351 | return be32_to_cpu(head->length); | |
352 | } | |
353 | ||
354 | static inline u16 tpm_buf_tag(struct tpm_buf *buf) | |
355 | { | |
356 | struct tpm_header *head = (struct tpm_header *)buf->data; | |
357 | ||
358 | return be16_to_cpu(head->tag); | |
359 | } | |
360 | ||
361 | static inline void tpm_buf_append(struct tpm_buf *buf, | |
362 | const unsigned char *new_data, | |
363 | unsigned int new_len) | |
364 | { | |
365 | struct tpm_header *head = (struct tpm_header *)buf->data; | |
366 | u32 len = tpm_buf_length(buf); | |
367 | ||
368 | /* Return silently if overflow has already happened. */ | |
369 | if (buf->flags & TPM_BUF_OVERFLOW) | |
370 | return; | |
371 | ||
372 | if ((len + new_len) > PAGE_SIZE) { | |
373 | WARN(1, "tpm_buf: overflow\n"); | |
374 | buf->flags |= TPM_BUF_OVERFLOW; | |
375 | return; | |
376 | } | |
377 | ||
378 | memcpy(&buf->data[len], new_data, new_len); | |
379 | head->length = cpu_to_be32(len + new_len); | |
380 | } | |
381 | ||
382 | static inline void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value) | |
383 | { | |
384 | tpm_buf_append(buf, &value, 1); | |
385 | } | |
386 | ||
387 | static inline void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value) | |
388 | { | |
389 | __be16 value2 = cpu_to_be16(value); | |
390 | ||
391 | tpm_buf_append(buf, (u8 *) &value2, 2); | |
392 | } | |
393 | ||
394 | static inline void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value) | |
395 | { | |
396 | __be32 value2 = cpu_to_be32(value); | |
397 | ||
398 | tpm_buf_append(buf, (u8 *) &value2, 4); | |
399 | } | |
400 | ||
2e19e101 SG |
401 | static inline u32 tpm2_rc_value(u32 rc) |
402 | { | |
403 | return (rc & BIT(7)) ? rc & 0xff : rc; | |
404 | } | |
405 | ||
ff76ec18 | 406 | #if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE) |
659aaf2b | 407 | |
aad887f6 | 408 | extern int tpm_is_tpm2(struct tpm_chip *chip); |
8c657a05 JS |
409 | extern __must_check int tpm_try_get_ops(struct tpm_chip *chip); |
410 | extern void tpm_put_ops(struct tpm_chip *chip); | |
411 | extern ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_buf *buf, | |
412 | size_t min_rsp_body_length, const char *desc); | |
879b5892 RS |
413 | extern int tpm_pcr_read(struct tpm_chip *chip, u32 pcr_idx, |
414 | struct tpm_digest *digest); | |
0b6cf6b9 RS |
415 | extern int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, |
416 | struct tpm_digest *digests); | |
aad887f6 JS |
417 | extern int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen); |
418 | extern int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max); | |
aaae8153 | 419 | extern struct tpm_chip *tpm_default_chip(void); |
45477b3f | 420 | void tpm2_flush_context(struct tpm_chip *chip, u32 handle); |
d6ba4521 | 421 | #else |
aad887f6 | 422 | static inline int tpm_is_tpm2(struct tpm_chip *chip) |
954650ef JS |
423 | { |
424 | return -ENODEV; | |
425 | } | |
879b5892 RS |
426 | static inline int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, |
427 | struct tpm_digest *digest) | |
aad887f6 | 428 | { |
d6ba4521 MZ |
429 | return -ENODEV; |
430 | } | |
95adc6b4 TW |
431 | |
432 | static inline int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, | |
0b6cf6b9 | 433 | struct tpm_digest *digests) |
aad887f6 | 434 | { |
d6ba4521 MZ |
435 | return -ENODEV; |
436 | } | |
95adc6b4 | 437 | |
aad887f6 JS |
438 | static inline int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen) |
439 | { | |
c749ba91 MZ |
440 | return -ENODEV; |
441 | } | |
aad887f6 JS |
442 | static inline int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max) |
443 | { | |
41ab999c KY |
444 | return -ENODEV; |
445 | } | |
954650ef | 446 | |
aaae8153 SB |
447 | static inline struct tpm_chip *tpm_default_chip(void) |
448 | { | |
449 | return NULL; | |
450 | } | |
659aaf2b RA |
451 | #endif |
452 | #endif |