| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Copyright 2019 Google LLC |
| */ |
| |
| #ifndef __LINUX_BLK_CRYPTO_INTERNAL_H |
| #define __LINUX_BLK_CRYPTO_INTERNAL_H |
| |
| #include <linux/bio.h> |
| #include <linux/blk-mq.h> |
| |
| /* Represents a crypto mode supported by blk-crypto */ |
| struct blk_crypto_mode { |
| const char *name; /* name of this mode, shown in sysfs */ |
| const char *cipher_str; /* crypto API name (for fallback case) */ |
| unsigned int keysize; /* key size in bytes */ |
| unsigned int ivsize; /* iv size in bytes */ |
| }; |
| |
| extern const struct blk_crypto_mode blk_crypto_modes[]; |
| |
| #ifdef CONFIG_BLK_INLINE_ENCRYPTION |
| |
| int blk_crypto_sysfs_register(struct request_queue *q); |
| |
| void blk_crypto_sysfs_unregister(struct request_queue *q); |
| |
| void bio_crypt_dun_increment(u64 dun[BLK_CRYPTO_DUN_ARRAY_SIZE], |
| unsigned int inc); |
| |
| bool bio_crypt_rq_ctx_compatible(struct request *rq, struct bio *bio); |
| |
| bool bio_crypt_ctx_mergeable(struct bio_crypt_ctx *bc1, unsigned int bc1_bytes, |
| struct bio_crypt_ctx *bc2); |
| |
| static inline bool bio_crypt_ctx_back_mergeable(struct request *req, |
| struct bio *bio) |
| { |
| return bio_crypt_ctx_mergeable(req->crypt_ctx, blk_rq_bytes(req), |
| bio->bi_crypt_context); |
| } |
| |
| static inline bool bio_crypt_ctx_front_mergeable(struct request *req, |
| struct bio *bio) |
| { |
| return bio_crypt_ctx_mergeable(bio->bi_crypt_context, |
| bio->bi_iter.bi_size, req->crypt_ctx); |
| } |
| |
| static inline bool bio_crypt_ctx_merge_rq(struct request *req, |
| struct request *next) |
| { |
| return bio_crypt_ctx_mergeable(req->crypt_ctx, blk_rq_bytes(req), |
| next->crypt_ctx); |
| } |
| |
| static inline void blk_crypto_rq_set_defaults(struct request *rq) |
| { |
| rq->crypt_ctx = NULL; |
| rq->crypt_keyslot = NULL; |
| } |
| |
| static inline bool blk_crypto_rq_is_encrypted(struct request *rq) |
| { |
| return rq->crypt_ctx; |
| } |
| |
| static inline bool blk_crypto_rq_has_keyslot(struct request *rq) |
| { |
| return rq->crypt_keyslot; |
| } |
| |
| blk_status_t blk_crypto_get_keyslot(struct blk_crypto_profile *profile, |
| const struct blk_crypto_key *key, |
| struct blk_crypto_keyslot **slot_ptr); |
| |
| void blk_crypto_put_keyslot(struct blk_crypto_keyslot *slot); |
| |
| int __blk_crypto_evict_key(struct blk_crypto_profile *profile, |
| const struct blk_crypto_key *key); |
| |
| bool __blk_crypto_cfg_supported(struct blk_crypto_profile *profile, |
| const struct blk_crypto_config *cfg); |
| |
| #else /* CONFIG_BLK_INLINE_ENCRYPTION */ |
| |
| static inline int blk_crypto_sysfs_register(struct request_queue *q) |
| { |
| return 0; |
| } |
| |
| static inline void blk_crypto_sysfs_unregister(struct request_queue *q) { } |
| |
| static inline bool bio_crypt_rq_ctx_compatible(struct request *rq, |
| struct bio *bio) |
| { |
| return true; |
| } |
| |
| static inline bool bio_crypt_ctx_front_mergeable(struct request *req, |
| struct bio *bio) |
| { |
| return true; |
| } |
| |
| static inline bool bio_crypt_ctx_back_mergeable(struct request *req, |
| struct bio *bio) |
| { |
| return true; |
| } |
| |
| static inline bool bio_crypt_ctx_merge_rq(struct request *req, |
| struct request *next) |
| { |
| return true; |
| } |
| |
| static inline void blk_crypto_rq_set_defaults(struct request *rq) { } |
| |
| static inline bool blk_crypto_rq_is_encrypted(struct request *rq) |
| { |
| return false; |
| } |
| |
| static inline bool blk_crypto_rq_has_keyslot(struct request *rq) |
| { |
| return false; |
| } |
| |
| #endif /* CONFIG_BLK_INLINE_ENCRYPTION */ |
| |
| void __bio_crypt_advance(struct bio *bio, unsigned int bytes); |
| static inline void bio_crypt_advance(struct bio *bio, unsigned int bytes) |
| { |
| if (bio_has_crypt_ctx(bio)) |
| __bio_crypt_advance(bio, bytes); |
| } |
| |
| void __bio_crypt_free_ctx(struct bio *bio); |
| static inline void bio_crypt_free_ctx(struct bio *bio) |
| { |
| if (bio_has_crypt_ctx(bio)) |
| __bio_crypt_free_ctx(bio); |
| } |
| |
| static inline void bio_crypt_do_front_merge(struct request *rq, |
| struct bio *bio) |
| { |
| #ifdef CONFIG_BLK_INLINE_ENCRYPTION |
| if (bio_has_crypt_ctx(bio)) |
| memcpy(rq->crypt_ctx->bc_dun, bio->bi_crypt_context->bc_dun, |
| sizeof(rq->crypt_ctx->bc_dun)); |
| #endif |
| } |
| |
| bool __blk_crypto_bio_prep(struct bio **bio_ptr); |
| static inline bool blk_crypto_bio_prep(struct bio **bio_ptr) |
| { |
| if (bio_has_crypt_ctx(*bio_ptr)) |
| return __blk_crypto_bio_prep(bio_ptr); |
| return true; |
| } |
| |
| blk_status_t __blk_crypto_rq_get_keyslot(struct request *rq); |
| static inline blk_status_t blk_crypto_rq_get_keyslot(struct request *rq) |
| { |
| if (blk_crypto_rq_is_encrypted(rq)) |
| return __blk_crypto_rq_get_keyslot(rq); |
| return BLK_STS_OK; |
| } |
| |
| void __blk_crypto_rq_put_keyslot(struct request *rq); |
| static inline void blk_crypto_rq_put_keyslot(struct request *rq) |
| { |
| if (blk_crypto_rq_has_keyslot(rq)) |
| __blk_crypto_rq_put_keyslot(rq); |
| } |
| |
| void __blk_crypto_free_request(struct request *rq); |
| static inline void blk_crypto_free_request(struct request *rq) |
| { |
| if (blk_crypto_rq_is_encrypted(rq)) |
| __blk_crypto_free_request(rq); |
| } |
| |
| int __blk_crypto_rq_bio_prep(struct request *rq, struct bio *bio, |
| gfp_t gfp_mask); |
| /** |
| * blk_crypto_rq_bio_prep - Prepare a request's crypt_ctx when its first bio |
| * is inserted |
| * @rq: The request to prepare |
| * @bio: The first bio being inserted into the request |
| * @gfp_mask: Memory allocation flags |
| * |
| * Return: 0 on success, -ENOMEM if out of memory. -ENOMEM is only possible if |
| * @gfp_mask doesn't include %__GFP_DIRECT_RECLAIM. |
| */ |
| static inline int blk_crypto_rq_bio_prep(struct request *rq, struct bio *bio, |
| gfp_t gfp_mask) |
| { |
| if (bio_has_crypt_ctx(bio)) |
| return __blk_crypto_rq_bio_prep(rq, bio, gfp_mask); |
| return 0; |
| } |
| |
| /** |
| * blk_crypto_insert_cloned_request - Prepare a cloned request to be inserted |
| * into a request queue. |
| * @rq: the request being queued |
| * |
| * Return: BLK_STS_OK on success, nonzero on error. |
| */ |
| static inline blk_status_t blk_crypto_insert_cloned_request(struct request *rq) |
| { |
| |
| if (blk_crypto_rq_is_encrypted(rq)) |
| return blk_crypto_rq_get_keyslot(rq); |
| return BLK_STS_OK; |
| } |
| |
| #ifdef CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK |
| |
| int blk_crypto_fallback_start_using_mode(enum blk_crypto_mode_num mode_num); |
| |
| bool blk_crypto_fallback_bio_prep(struct bio **bio_ptr); |
| |
| int blk_crypto_fallback_evict_key(const struct blk_crypto_key *key); |
| |
| #else /* CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK */ |
| |
| static inline int |
| blk_crypto_fallback_start_using_mode(enum blk_crypto_mode_num mode_num) |
| { |
| pr_warn_once("crypto API fallback is disabled\n"); |
| return -ENOPKG; |
| } |
| |
| static inline bool blk_crypto_fallback_bio_prep(struct bio **bio_ptr) |
| { |
| pr_warn_once("crypto API fallback disabled; failing request.\n"); |
| (*bio_ptr)->bi_status = BLK_STS_NOTSUPP; |
| return false; |
| } |
| |
| static inline int |
| blk_crypto_fallback_evict_key(const struct blk_crypto_key *key) |
| { |
| return 0; |
| } |
| |
| #endif /* CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK */ |
| |
| #endif /* __LINUX_BLK_CRYPTO_INTERNAL_H */ |