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