256 lines
6.5 KiB
C
256 lines
6.5 KiB
C
/* 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/blk-mq.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 *name; /* name of this mode, shown in sysfs */
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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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int blk_crypto_sysfs_register(struct gendisk *disk);
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void blk_crypto_sysfs_unregister(struct gendisk *disk);
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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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static inline bool blk_crypto_rq_has_keyslot(struct request *rq)
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{
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return rq->crypt_keyslot;
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}
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blk_status_t blk_crypto_get_keyslot(struct blk_crypto_profile *profile,
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const struct blk_crypto_key *key,
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struct blk_crypto_keyslot **slot_ptr);
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void blk_crypto_put_keyslot(struct blk_crypto_keyslot *slot);
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int __blk_crypto_evict_key(struct blk_crypto_profile *profile,
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const struct blk_crypto_key *key);
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bool __blk_crypto_cfg_supported(struct blk_crypto_profile *profile,
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const struct blk_crypto_config *cfg);
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#else /* CONFIG_BLK_INLINE_ENCRYPTION */
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static inline int blk_crypto_sysfs_register(struct gendisk *disk)
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{
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return 0;
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}
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static inline void blk_crypto_sysfs_unregister(struct gendisk *disk)
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{
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}
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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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static inline bool blk_crypto_rq_has_keyslot(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_rq_get_keyslot(struct request *rq);
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static inline blk_status_t blk_crypto_rq_get_keyslot(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_rq_get_keyslot(rq);
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return BLK_STS_OK;
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}
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void __blk_crypto_rq_put_keyslot(struct request *rq);
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static inline void blk_crypto_rq_put_keyslot(struct request *rq)
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{
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if (blk_crypto_rq_has_keyslot(rq))
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__blk_crypto_rq_put_keyslot(rq);
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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_rq_get_keyslot(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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