LCOV - code coverage report
Current view: top level - block - blk-crypto-internal.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 6 0.0 %
Date: 2023-04-06 08:38:28 Functions: 0 0 -

          Line data    Source code
       1             : /* SPDX-License-Identifier: GPL-2.0 */
       2             : /*
       3             :  * Copyright 2019 Google LLC
       4             :  */
       5             : 
       6             : #ifndef __LINUX_BLK_CRYPTO_INTERNAL_H
       7             : #define __LINUX_BLK_CRYPTO_INTERNAL_H
       8             : 
       9             : #include <linux/bio.h>
      10             : #include <linux/blk-mq.h>
      11             : 
      12             : /* Represents a crypto mode supported by blk-crypto  */
      13             : struct blk_crypto_mode {
      14             :         const char *name; /* name of this mode, shown in sysfs */
      15             :         const char *cipher_str; /* crypto API name (for fallback case) */
      16             :         unsigned int keysize; /* key size in bytes */
      17             :         unsigned int ivsize; /* iv size in bytes */
      18             : };
      19             : 
      20             : extern const struct blk_crypto_mode blk_crypto_modes[];
      21             : 
      22             : #ifdef CONFIG_BLK_INLINE_ENCRYPTION
      23             : 
      24             : int blk_crypto_sysfs_register(struct gendisk *disk);
      25             : 
      26             : void blk_crypto_sysfs_unregister(struct gendisk *disk);
      27             : 
      28             : void bio_crypt_dun_increment(u64 dun[BLK_CRYPTO_DUN_ARRAY_SIZE],
      29             :                              unsigned int inc);
      30             : 
      31             : bool bio_crypt_rq_ctx_compatible(struct request *rq, struct bio *bio);
      32             : 
      33             : bool bio_crypt_ctx_mergeable(struct bio_crypt_ctx *bc1, unsigned int bc1_bytes,
      34             :                              struct bio_crypt_ctx *bc2);
      35             : 
      36             : static inline bool bio_crypt_ctx_back_mergeable(struct request *req,
      37             :                                                 struct bio *bio)
      38             : {
      39             :         return bio_crypt_ctx_mergeable(req->crypt_ctx, blk_rq_bytes(req),
      40             :                                        bio->bi_crypt_context);
      41             : }
      42             : 
      43             : static inline bool bio_crypt_ctx_front_mergeable(struct request *req,
      44             :                                                  struct bio *bio)
      45             : {
      46             :         return bio_crypt_ctx_mergeable(bio->bi_crypt_context,
      47             :                                        bio->bi_iter.bi_size, req->crypt_ctx);
      48             : }
      49             : 
      50             : static inline bool bio_crypt_ctx_merge_rq(struct request *req,
      51             :                                           struct request *next)
      52             : {
      53             :         return bio_crypt_ctx_mergeable(req->crypt_ctx, blk_rq_bytes(req),
      54             :                                        next->crypt_ctx);
      55             : }
      56             : 
      57             : static inline void blk_crypto_rq_set_defaults(struct request *rq)
      58             : {
      59             :         rq->crypt_ctx = NULL;
      60             :         rq->crypt_keyslot = NULL;
      61             : }
      62             : 
      63             : static inline bool blk_crypto_rq_is_encrypted(struct request *rq)
      64             : {
      65             :         return rq->crypt_ctx;
      66             : }
      67             : 
      68             : blk_status_t blk_crypto_get_keyslot(struct blk_crypto_profile *profile,
      69             :                                     const struct blk_crypto_key *key,
      70             :                                     struct blk_crypto_keyslot **slot_ptr);
      71             : 
      72             : void blk_crypto_put_keyslot(struct blk_crypto_keyslot *slot);
      73             : 
      74             : int __blk_crypto_evict_key(struct blk_crypto_profile *profile,
      75             :                            const struct blk_crypto_key *key);
      76             : 
      77             : bool __blk_crypto_cfg_supported(struct blk_crypto_profile *profile,
      78             :                                 const struct blk_crypto_config *cfg);
      79             : 
      80             : #else /* CONFIG_BLK_INLINE_ENCRYPTION */
      81             : 
      82             : static inline int blk_crypto_sysfs_register(struct gendisk *disk)
      83             : {
      84             :         return 0;
      85             : }
      86             : 
      87             : static inline void blk_crypto_sysfs_unregister(struct gendisk *disk)
      88             : {
      89             : }
      90             : 
      91             : static inline bool bio_crypt_rq_ctx_compatible(struct request *rq,
      92             :                                                struct bio *bio)
      93             : {
      94             :         return true;
      95             : }
      96             : 
      97             : static inline bool bio_crypt_ctx_front_mergeable(struct request *req,
      98             :                                                  struct bio *bio)
      99             : {
     100             :         return true;
     101             : }
     102             : 
     103             : static inline bool bio_crypt_ctx_back_mergeable(struct request *req,
     104             :                                                 struct bio *bio)
     105             : {
     106             :         return true;
     107             : }
     108             : 
     109             : static inline bool bio_crypt_ctx_merge_rq(struct request *req,
     110             :                                           struct request *next)
     111             : {
     112             :         return true;
     113             : }
     114             : 
     115             : static inline void blk_crypto_rq_set_defaults(struct request *rq) { }
     116             : 
     117             : static inline bool blk_crypto_rq_is_encrypted(struct request *rq)
     118             : {
     119             :         return false;
     120             : }
     121             : 
     122             : #endif /* CONFIG_BLK_INLINE_ENCRYPTION */
     123             : 
     124             : void __bio_crypt_advance(struct bio *bio, unsigned int bytes);
     125             : static inline void bio_crypt_advance(struct bio *bio, unsigned int bytes)
     126             : {
     127           0 :         if (bio_has_crypt_ctx(bio))
     128             :                 __bio_crypt_advance(bio, bytes);
     129             : }
     130             : 
     131             : void __bio_crypt_free_ctx(struct bio *bio);
     132             : static inline void bio_crypt_free_ctx(struct bio *bio)
     133             : {
     134           0 :         if (bio_has_crypt_ctx(bio))
     135             :                 __bio_crypt_free_ctx(bio);
     136             : }
     137             : 
     138             : static inline void bio_crypt_do_front_merge(struct request *rq,
     139             :                                             struct bio *bio)
     140             : {
     141             : #ifdef CONFIG_BLK_INLINE_ENCRYPTION
     142             :         if (bio_has_crypt_ctx(bio))
     143             :                 memcpy(rq->crypt_ctx->bc_dun, bio->bi_crypt_context->bc_dun,
     144             :                        sizeof(rq->crypt_ctx->bc_dun));
     145             : #endif
     146             : }
     147             : 
     148             : bool __blk_crypto_bio_prep(struct bio **bio_ptr);
     149             : static inline bool blk_crypto_bio_prep(struct bio **bio_ptr)
     150             : {
     151           0 :         if (bio_has_crypt_ctx(*bio_ptr))
     152             :                 return __blk_crypto_bio_prep(bio_ptr);
     153             :         return true;
     154             : }
     155             : 
     156             : blk_status_t __blk_crypto_init_request(struct request *rq);
     157             : static inline blk_status_t blk_crypto_init_request(struct request *rq)
     158             : {
     159           0 :         if (blk_crypto_rq_is_encrypted(rq))
     160             :                 return __blk_crypto_init_request(rq);
     161             :         return BLK_STS_OK;
     162             : }
     163             : 
     164             : void __blk_crypto_free_request(struct request *rq);
     165             : static inline void blk_crypto_free_request(struct request *rq)
     166             : {
     167           0 :         if (blk_crypto_rq_is_encrypted(rq))
     168             :                 __blk_crypto_free_request(rq);
     169             : }
     170             : 
     171             : int __blk_crypto_rq_bio_prep(struct request *rq, struct bio *bio,
     172             :                              gfp_t gfp_mask);
     173             : /**
     174             :  * blk_crypto_rq_bio_prep - Prepare a request's crypt_ctx when its first bio
     175             :  *                          is inserted
     176             :  * @rq: The request to prepare
     177             :  * @bio: The first bio being inserted into the request
     178             :  * @gfp_mask: Memory allocation flags
     179             :  *
     180             :  * Return: 0 on success, -ENOMEM if out of memory.  -ENOMEM is only possible if
     181             :  *         @gfp_mask doesn't include %__GFP_DIRECT_RECLAIM.
     182             :  */
     183             : static inline int blk_crypto_rq_bio_prep(struct request *rq, struct bio *bio,
     184             :                                          gfp_t gfp_mask)
     185             : {
     186           0 :         if (bio_has_crypt_ctx(bio))
     187             :                 return __blk_crypto_rq_bio_prep(rq, bio, gfp_mask);
     188             :         return 0;
     189             : }
     190             : 
     191             : /**
     192             :  * blk_crypto_insert_cloned_request - Prepare a cloned request to be inserted
     193             :  *                                    into a request queue.
     194             :  * @rq: the request being queued
     195             :  *
     196             :  * Return: BLK_STS_OK on success, nonzero on error.
     197             :  */
     198             : static inline blk_status_t blk_crypto_insert_cloned_request(struct request *rq)
     199             : {
     200             : 
     201             :         if (blk_crypto_rq_is_encrypted(rq))
     202             :                 return blk_crypto_init_request(rq);
     203             :         return BLK_STS_OK;
     204             : }
     205             : 
     206             : #ifdef CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK
     207             : 
     208             : int blk_crypto_fallback_start_using_mode(enum blk_crypto_mode_num mode_num);
     209             : 
     210             : bool blk_crypto_fallback_bio_prep(struct bio **bio_ptr);
     211             : 
     212             : int blk_crypto_fallback_evict_key(const struct blk_crypto_key *key);
     213             : 
     214             : #else /* CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK */
     215             : 
     216             : static inline int
     217             : blk_crypto_fallback_start_using_mode(enum blk_crypto_mode_num mode_num)
     218             : {
     219             :         pr_warn_once("crypto API fallback is disabled\n");
     220             :         return -ENOPKG;
     221             : }
     222             : 
     223             : static inline bool blk_crypto_fallback_bio_prep(struct bio **bio_ptr)
     224             : {
     225             :         pr_warn_once("crypto API fallback disabled; failing request.\n");
     226             :         (*bio_ptr)->bi_status = BLK_STS_NOTSUPP;
     227             :         return false;
     228             : }
     229             : 
     230             : static inline int
     231             : blk_crypto_fallback_evict_key(const struct blk_crypto_key *key)
     232             : {
     233             :         return 0;
     234             : }
     235             : 
     236             : #endif /* CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK */
     237             : 
     238             : #endif /* __LINUX_BLK_CRYPTO_INTERNAL_H */

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