Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Herbert Xu | 42c271c | 2007-12-07 18:52:49 +0800 | [diff] [blame] | 2 | * Cryptographic scatter and gather helpers. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> |
| 5 | * Copyright (c) 2002 Adam J. Richter <adam@yggdrasil.com> |
| 6 | * Copyright (c) 2004 Jean-Luc Cooke <jlcooke@certainkey.com> |
Herbert Xu | 42c271c | 2007-12-07 18:52:49 +0800 | [diff] [blame] | 7 | * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify it |
| 10 | * under the terms of the GNU General Public License as published by the Free |
| 11 | * Software Foundation; either version 2 of the License, or (at your option) |
| 12 | * any later version. |
| 13 | * |
| 14 | */ |
| 15 | |
| 16 | #ifndef _CRYPTO_SCATTERWALK_H |
| 17 | #define _CRYPTO_SCATTERWALK_H |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | |
Herbert Xu | 42c271c | 2007-12-07 18:52:49 +0800 | [diff] [blame] | 19 | #include <asm/kmap_types.h> |
| 20 | #include <crypto/algapi.h> |
| 21 | #include <linux/hardirq.h> |
| 22 | #include <linux/highmem.h> |
| 23 | #include <linux/kernel.h> |
Herbert Xu | 5c64097 | 2006-08-12 21:56:17 +1000 | [diff] [blame] | 24 | #include <linux/mm.h> |
| 25 | #include <linux/scatterlist.h> |
Herbert Xu | 1c5dfe6 | 2007-12-24 08:54:24 +0800 | [diff] [blame] | 26 | #include <linux/sched.h> |
Herbert Xu | 5c64097 | 2006-08-12 21:56:17 +1000 | [diff] [blame] | 27 | |
Herbert Xu | b2ab4a5 | 2007-12-05 20:59:25 +1100 | [diff] [blame] | 28 | static inline void scatterwalk_sg_chain(struct scatterlist *sg1, int num, |
| 29 | struct scatterlist *sg2) |
| 30 | { |
| 31 | sg_set_page(&sg1[num - 1], (void *)sg2, 0, 0); |
Herbert Xu | 8ec970d | 2008-04-29 21:53:52 +0800 | [diff] [blame] | 32 | sg1[num - 1].page_link &= ~0x02; |
Tom Lendacky | 41da8b5 | 2013-11-12 11:46:10 -0600 | [diff] [blame] | 33 | sg1[num - 1].page_link |= 0x01; |
Herbert Xu | b2ab4a5 | 2007-12-05 20:59:25 +1100 | [diff] [blame] | 34 | } |
| 35 | |
Steffen Klassert | 079f2f7 | 2010-11-22 11:25:50 +0100 | [diff] [blame] | 36 | static inline void scatterwalk_crypto_chain(struct scatterlist *head, |
| 37 | struct scatterlist *sg, |
| 38 | int chain, int num) |
| 39 | { |
| 40 | if (chain) { |
| 41 | head->length += sg->length; |
Cristian Stoica | 5be4d4c | 2015-01-20 10:06:16 +0200 | [diff] [blame] | 42 | sg = sg_next(sg); |
Steffen Klassert | 079f2f7 | 2010-11-22 11:25:50 +0100 | [diff] [blame] | 43 | } |
| 44 | |
| 45 | if (sg) |
| 46 | scatterwalk_sg_chain(head, num, sg); |
| 47 | else |
| 48 | sg_mark_end(head); |
| 49 | } |
| 50 | |
Herbert Xu | 5c64097 | 2006-08-12 21:56:17 +1000 | [diff] [blame] | 51 | static inline unsigned long scatterwalk_samebuf(struct scatter_walk *walk_in, |
| 52 | struct scatter_walk *walk_out) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | { |
Jens Axboe | 78c2f0b | 2007-10-22 19:40:16 +0200 | [diff] [blame] | 54 | return !(((sg_page(walk_in->sg) - sg_page(walk_out->sg)) << PAGE_SHIFT) + |
Herbert Xu | 5c64097 | 2006-08-12 21:56:17 +1000 | [diff] [blame] | 55 | (int)(walk_in->offset - walk_out->offset)); |
| 56 | } |
| 57 | |
| 58 | static inline unsigned int scatterwalk_pagelen(struct scatter_walk *walk) |
| 59 | { |
| 60 | unsigned int len = walk->sg->offset + walk->sg->length - walk->offset; |
| 61 | unsigned int len_this_page = offset_in_page(~walk->offset) + 1; |
| 62 | return len_this_page > len ? len : len_this_page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | } |
| 64 | |
Herbert Xu | c774e93 | 2005-07-06 13:51:31 -0700 | [diff] [blame] | 65 | static inline unsigned int scatterwalk_clamp(struct scatter_walk *walk, |
| 66 | unsigned int nbytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | { |
Herbert Xu | 5c64097 | 2006-08-12 21:56:17 +1000 | [diff] [blame] | 68 | unsigned int len_this_page = scatterwalk_pagelen(walk); |
| 69 | return nbytes > len_this_page ? len_this_page : nbytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | } |
| 71 | |
| 72 | static inline void scatterwalk_advance(struct scatter_walk *walk, |
| 73 | unsigned int nbytes) |
| 74 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | walk->offset += nbytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | } |
| 77 | |
Herbert Xu | 9547737 | 2005-07-06 13:52:09 -0700 | [diff] [blame] | 78 | static inline unsigned int scatterwalk_aligned(struct scatter_walk *walk, |
| 79 | unsigned int alignmask) |
| 80 | { |
| 81 | return !(walk->offset & alignmask); |
| 82 | } |
| 83 | |
Herbert Xu | 5c64097 | 2006-08-12 21:56:17 +1000 | [diff] [blame] | 84 | static inline struct page *scatterwalk_page(struct scatter_walk *walk) |
| 85 | { |
Jens Axboe | 78c2f0b | 2007-10-22 19:40:16 +0200 | [diff] [blame] | 86 | return sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT); |
Herbert Xu | 5c64097 | 2006-08-12 21:56:17 +1000 | [diff] [blame] | 87 | } |
| 88 | |
Cong Wang | f0dfc0b | 2011-11-25 23:14:17 +0800 | [diff] [blame] | 89 | static inline void scatterwalk_unmap(void *vaddr) |
Herbert Xu | 5c64097 | 2006-08-12 21:56:17 +1000 | [diff] [blame] | 90 | { |
Cong Wang | f0dfc0b | 2011-11-25 23:14:17 +0800 | [diff] [blame] | 91 | kunmap_atomic(vaddr); |
Herbert Xu | 5c64097 | 2006-08-12 21:56:17 +1000 | [diff] [blame] | 92 | } |
| 93 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | void scatterwalk_start(struct scatter_walk *walk, struct scatterlist *sg); |
Herbert Xu | 5c64097 | 2006-08-12 21:56:17 +1000 | [diff] [blame] | 95 | void scatterwalk_copychunks(void *buf, struct scatter_walk *walk, |
| 96 | size_t nbytes, int out); |
Cong Wang | f0dfc0b | 2011-11-25 23:14:17 +0800 | [diff] [blame] | 97 | void *scatterwalk_map(struct scatter_walk *walk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | void scatterwalk_done(struct scatter_walk *walk, int out, int more); |
| 99 | |
Herbert Xu | 5fa0fea | 2007-08-29 16:31:34 +0800 | [diff] [blame] | 100 | void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg, |
| 101 | unsigned int start, unsigned int nbytes, int out); |
| 102 | |
Joel Fernandes | 257aff5 | 2013-08-17 21:42:22 -0500 | [diff] [blame] | 103 | int scatterwalk_bytes_sglen(struct scatterlist *sg, int num_bytes); |
| 104 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | #endif /* _CRYPTO_SCATTERWALK_H */ |