LCOV - code coverage report
Current view: top level - block - blk-crypto-internal.h (source / functions) Hit Total Coverage
Test: landlock.info Lines: 26 31 83.9 %
Date: 2021-04-22 12:43:58 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/blkdev.h>
      11             : 
      12             : /* Represents a crypto mode supported by blk-crypto  */
      13             : struct blk_crypto_mode {
      14             :         const char *cipher_str; /* crypto API name (for fallback case) */
      15             :         unsigned int keysize; /* key size in bytes */
      16             :         unsigned int ivsize; /* iv size in bytes */
      17             : };
      18             : 
      19             : extern const struct blk_crypto_mode blk_crypto_modes[];
      20             : 
      21             : #ifdef CONFIG_BLK_INLINE_ENCRYPTION
      22             : 
      23             : void bio_crypt_dun_increment(u64 dun[BLK_CRYPTO_DUN_ARRAY_SIZE],
      24             :                              unsigned int inc);
      25             : 
      26             : bool bio_crypt_rq_ctx_compatible(struct request *rq, struct bio *bio);
      27             : 
      28             : bool bio_crypt_ctx_mergeable(struct bio_crypt_ctx *bc1, unsigned int bc1_bytes,
      29             :                              struct bio_crypt_ctx *bc2);
      30             : 
      31             : static inline bool bio_crypt_ctx_back_mergeable(struct request *req,
      32             :                                                 struct bio *bio)
      33             : {
      34             :         return bio_crypt_ctx_mergeable(req->crypt_ctx, blk_rq_bytes(req),
      35             :                                        bio->bi_crypt_context);
      36             : }
      37             : 
      38             : static inline bool bio_crypt_ctx_front_mergeable(struct request *req,
      39             :                                                  struct bio *bio)
      40             : {
      41             :         return bio_crypt_ctx_mergeable(bio->bi_crypt_context,
      42             :                                        bio->bi_iter.bi_size, req->crypt_ctx);
      43             : }
      44             : 
      45             : static inline bool bio_crypt_ctx_merge_rq(struct request *req,
      46             :                                           struct request *next)
      47             : {
      48             :         return bio_crypt_ctx_mergeable(req->crypt_ctx, blk_rq_bytes(req),
      49             :                                        next->crypt_ctx);
      50             : }
      51             : 
      52             : static inline void blk_crypto_rq_set_defaults(struct request *rq)
      53             : {
      54             :         rq->crypt_ctx = NULL;
      55             :         rq->crypt_keyslot = NULL;
      56             : }
      57             : 
      58             : static inline bool blk_crypto_rq_is_encrypted(struct request *rq)
      59             : {
      60             :         return rq->crypt_ctx;
      61             : }
      62             : 
      63             : #else /* CONFIG_BLK_INLINE_ENCRYPTION */
      64             : 
      65        9293 : static inline bool bio_crypt_rq_ctx_compatible(struct request *rq,
      66             :                                                struct bio *bio)
      67             : {
      68        9293 :         return true;
      69             : }
      70             : 
      71          99 : static inline bool bio_crypt_ctx_front_mergeable(struct request *req,
      72             :                                                  struct bio *bio)
      73             : {
      74          99 :         return true;
      75             : }
      76             : 
      77        5387 : static inline bool bio_crypt_ctx_back_mergeable(struct request *req,
      78             :                                                 struct bio *bio)
      79             : {
      80        5387 :         return true;
      81             : }
      82             : 
      83           0 : static inline bool bio_crypt_ctx_merge_rq(struct request *req,
      84             :                                           struct request *next)
      85             : {
      86           0 :         return true;
      87             : }
      88             : 
      89        3444 : static inline void blk_crypto_rq_set_defaults(struct request *rq) { }
      90             : 
      91        6506 : static inline bool blk_crypto_rq_is_encrypted(struct request *rq)
      92             : {
      93        6506 :         return false;
      94             : }
      95             : 
      96             : #endif /* CONFIG_BLK_INLINE_ENCRYPTION */
      97             : 
      98             : void __bio_crypt_advance(struct bio *bio, unsigned int bytes);
      99        8799 : static inline void bio_crypt_advance(struct bio *bio, unsigned int bytes)
     100             : {
     101        8799 :         if (bio_has_crypt_ctx(bio))
     102             :                 __bio_crypt_advance(bio, bytes);
     103             : }
     104             : 
     105             : void __bio_crypt_free_ctx(struct bio *bio);
     106       22791 : static inline void bio_crypt_free_ctx(struct bio *bio)
     107             : {
     108       22791 :         if (bio_has_crypt_ctx(bio))
     109             :                 __bio_crypt_free_ctx(bio);
     110             : }
     111             : 
     112          99 : static inline void bio_crypt_do_front_merge(struct request *rq,
     113             :                                             struct bio *bio)
     114             : {
     115             : #ifdef CONFIG_BLK_INLINE_ENCRYPTION
     116             :         if (bio_has_crypt_ctx(bio))
     117             :                 memcpy(rq->crypt_ctx->bc_dun, bio->bi_crypt_context->bc_dun,
     118             :                        sizeof(rq->crypt_ctx->bc_dun));
     119             : #endif
     120          99 : }
     121             : 
     122             : bool __blk_crypto_bio_prep(struct bio **bio_ptr);
     123        8737 : static inline bool blk_crypto_bio_prep(struct bio **bio_ptr)
     124             : {
     125        8737 :         if (bio_has_crypt_ctx(*bio_ptr))
     126             :                 return __blk_crypto_bio_prep(bio_ptr);
     127        8737 :         return true;
     128             : }
     129             : 
     130             : blk_status_t __blk_crypto_init_request(struct request *rq);
     131        3252 : static inline blk_status_t blk_crypto_init_request(struct request *rq)
     132             : {
     133        3252 :         if (blk_crypto_rq_is_encrypted(rq))
     134             :                 return __blk_crypto_init_request(rq);
     135        3252 :         return BLK_STS_OK;
     136             : }
     137             : 
     138             : void __blk_crypto_free_request(struct request *rq);
     139        3254 : static inline void blk_crypto_free_request(struct request *rq)
     140             : {
     141        3254 :         if (blk_crypto_rq_is_encrypted(rq))
     142             :                 __blk_crypto_free_request(rq);
     143             : }
     144             : 
     145             : int __blk_crypto_rq_bio_prep(struct request *rq, struct bio *bio,
     146             :                              gfp_t gfp_mask);
     147             : /**
     148             :  * blk_crypto_rq_bio_prep - Prepare a request's crypt_ctx when its first bio
     149             :  *                          is inserted
     150             :  * @rq: The request to prepare
     151             :  * @bio: The first bio being inserted into the request
     152             :  * @gfp_mask: Memory allocation flags
     153             :  *
     154             :  * Return: 0 on success, -ENOMEM if out of memory.  -ENOMEM is only possible if
     155             :  *         @gfp_mask doesn't include %__GFP_DIRECT_RECLAIM.
     156             :  */
     157        3252 : static inline int blk_crypto_rq_bio_prep(struct request *rq, struct bio *bio,
     158             :                                          gfp_t gfp_mask)
     159             : {
     160        3252 :         if (bio_has_crypt_ctx(bio))
     161             :                 return __blk_crypto_rq_bio_prep(rq, bio, gfp_mask);
     162        3252 :         return 0;
     163             : }
     164             : 
     165             : /**
     166             :  * blk_crypto_insert_cloned_request - Prepare a cloned request to be inserted
     167             :  *                                    into a request queue.
     168             :  * @rq: the request being queued
     169             :  *
     170             :  * Return: BLK_STS_OK on success, nonzero on error.
     171             :  */
     172           0 : static inline blk_status_t blk_crypto_insert_cloned_request(struct request *rq)
     173             : {
     174             : 
     175           0 :         if (blk_crypto_rq_is_encrypted(rq))
     176             :                 return blk_crypto_init_request(rq);
     177           0 :         return BLK_STS_OK;
     178             : }
     179             : 
     180             : #ifdef CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK
     181             : 
     182             : int blk_crypto_fallback_start_using_mode(enum blk_crypto_mode_num mode_num);
     183             : 
     184             : bool blk_crypto_fallback_bio_prep(struct bio **bio_ptr);
     185             : 
     186             : int blk_crypto_fallback_evict_key(const struct blk_crypto_key *key);
     187             : 
     188             : #else /* CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK */
     189             : 
     190             : static inline int
     191             : blk_crypto_fallback_start_using_mode(enum blk_crypto_mode_num mode_num)
     192             : {
     193             :         pr_warn_once("crypto API fallback is disabled\n");
     194             :         return -ENOPKG;
     195             : }
     196             : 
     197             : static inline bool blk_crypto_fallback_bio_prep(struct bio **bio_ptr)
     198             : {
     199             :         pr_warn_once("crypto API fallback disabled; failing request.\n");
     200             :         (*bio_ptr)->bi_status = BLK_STS_NOTSUPP;
     201             :         return false;
     202             : }
     203             : 
     204             : static inline int
     205             : blk_crypto_fallback_evict_key(const struct blk_crypto_key *key)
     206             : {
     207             :         return 0;
     208             : }
     209             : 
     210             : #endif /* CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK */
     211             : 
     212             : #endif /* __LINUX_BLK_CRYPTO_INTERNAL_H */

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