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Linux/include/crypto/scatterwalk.h

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  1 /* SPDX-License-Identifier: GPL-2.0-or-later */
  2 /*
  3  * Cryptographic scatter and gather helpers.
  4  *
  5  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
  6  * Copyright (c) 2002 Adam J. Richter <adam@yggdrasil.com>
  7  * Copyright (c) 2004 Jean-Luc Cooke <jlcooke@certainkey.com>
  8  * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
  9  */
 10 
 11 #ifndef _CRYPTO_SCATTERWALK_H
 12 #define _CRYPTO_SCATTERWALK_H
 13 
 14 #include <crypto/algapi.h>
 15 #include <linux/highmem.h>
 16 #include <linux/kernel.h>
 17 #include <linux/scatterlist.h>
 18 
 19 static inline void scatterwalk_crypto_chain(struct scatterlist *head,
 20                                             struct scatterlist *sg, int num)
 21 {
 22         if (sg)
 23                 sg_chain(head, num, sg);
 24         else
 25                 sg_mark_end(head);
 26 }
 27 
 28 static inline unsigned int scatterwalk_pagelen(struct scatter_walk *walk)
 29 {
 30         unsigned int len = walk->sg->offset + walk->sg->length - walk->offset;
 31         unsigned int len_this_page = offset_in_page(~walk->offset) + 1;
 32         return len_this_page > len ? len : len_this_page;
 33 }
 34 
 35 static inline unsigned int scatterwalk_clamp(struct scatter_walk *walk,
 36                                              unsigned int nbytes)
 37 {
 38         unsigned int len_this_page = scatterwalk_pagelen(walk);
 39         return nbytes > len_this_page ? len_this_page : nbytes;
 40 }
 41 
 42 static inline void scatterwalk_advance(struct scatter_walk *walk,
 43                                        unsigned int nbytes)
 44 {
 45         walk->offset += nbytes;
 46 }
 47 
 48 static inline unsigned int scatterwalk_aligned(struct scatter_walk *walk,
 49                                                unsigned int alignmask)
 50 {
 51         return !(walk->offset & alignmask);
 52 }
 53 
 54 static inline struct page *scatterwalk_page(struct scatter_walk *walk)
 55 {
 56         return sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
 57 }
 58 
 59 static inline void scatterwalk_unmap(void *vaddr)
 60 {
 61         kunmap_atomic(vaddr);
 62 }
 63 
 64 static inline void scatterwalk_start(struct scatter_walk *walk,
 65                                      struct scatterlist *sg)
 66 {
 67         walk->sg = sg;
 68         walk->offset = sg->offset;
 69 }
 70 
 71 static inline void *scatterwalk_map(struct scatter_walk *walk)
 72 {
 73         return kmap_atomic(scatterwalk_page(walk)) +
 74                offset_in_page(walk->offset);
 75 }
 76 
 77 static inline void scatterwalk_pagedone(struct scatter_walk *walk, int out,
 78                                         unsigned int more)
 79 {
 80         if (out) {
 81                 struct page *page;
 82 
 83                 page = sg_page(walk->sg) + ((walk->offset - 1) >> PAGE_SHIFT);
 84                 /* Test ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE first as
 85                  * PageSlab cannot be optimised away per se due to
 86                  * use of volatile pointer.
 87                  */
 88                 if (ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE && !PageSlab(page))
 89                         flush_dcache_page(page);
 90         }
 91 
 92         if (more && walk->offset >= walk->sg->offset + walk->sg->length)
 93                 scatterwalk_start(walk, sg_next(walk->sg));
 94 }
 95 
 96 static inline void scatterwalk_done(struct scatter_walk *walk, int out,
 97                                     int more)
 98 {
 99         if (!more || walk->offset >= walk->sg->offset + walk->sg->length ||
100             !(walk->offset & (PAGE_SIZE - 1)))
101                 scatterwalk_pagedone(walk, out, more);
102 }
103 
104 void scatterwalk_copychunks(void *buf, struct scatter_walk *walk,
105                             size_t nbytes, int out);
106 void *scatterwalk_map(struct scatter_walk *walk);
107 
108 void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
109                               unsigned int start, unsigned int nbytes, int out);
110 
111 struct scatterlist *scatterwalk_ffwd(struct scatterlist dst[2],
112                                      struct scatterlist *src,
113                                      unsigned int len);
114 
115 #endif  /* _CRYPTO_SCATTERWALK_H */
116 

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