1 #ifndef _BCACHEFS_CHECKSUM_H
2 #define _BCACHEFS_CHECKSUM_H
5 #include "extents_types.h"
8 #include <crypto/chacha20.h>
10 u64 bch2_crc64_update(u64, const void *, size_t);
12 #define BCH_NONCE_EXTENT cpu_to_le32(1 << 28)
13 #define BCH_NONCE_BTREE cpu_to_le32(2 << 28)
14 #define BCH_NONCE_JOURNAL cpu_to_le32(3 << 28)
15 #define BCH_NONCE_PRIO cpu_to_le32(4 << 28)
16 #define BCH_NONCE_POLY cpu_to_le32(1 << 31)
18 struct bch_csum bch2_checksum(struct bch_fs *, unsigned, struct nonce,
19 const void *, size_t);
22 * This is used for various on disk data structures - bch_sb, prio_set, bset,
23 * jset: The checksum is _always_ the first field of these structs
25 #define csum_vstruct(_c, _type, _nonce, _i) \
27 const void *start = ((const void *) (_i)) + sizeof((_i)->csum); \
28 const void *end = vstruct_end(_i); \
30 bch2_checksum(_c, _type, _nonce, start, end - start); \
33 int bch2_chacha_encrypt_key(struct bch_key *, struct nonce, void *, size_t);
34 int bch2_request_key(struct bch_sb *, struct bch_key *);
36 void bch2_encrypt(struct bch_fs *, unsigned, struct nonce,
39 struct bch_csum bch2_checksum_bio(struct bch_fs *, unsigned,
40 struct nonce, struct bio *);
42 int bch2_rechecksum_bio(struct bch_fs *, struct bio *, struct bversion,
43 struct bch_extent_crc_unpacked,
44 struct bch_extent_crc_unpacked *,
45 struct bch_extent_crc_unpacked *,
46 unsigned, unsigned, unsigned);
48 void bch2_encrypt_bio(struct bch_fs *, unsigned,
49 struct nonce, struct bio *);
51 int bch2_decrypt_sb_key(struct bch_fs *, struct bch_sb_field_crypt *,
54 int bch2_disable_encryption(struct bch_fs *);
55 int bch2_enable_encryption(struct bch_fs *, bool);
57 void bch2_fs_encryption_exit(struct bch_fs *);
58 int bch2_fs_encryption_init(struct bch_fs *);
60 static inline enum bch_csum_type bch2_csum_opt_to_type(enum bch_csum_opts type,
64 case BCH_CSUM_OPT_NONE:
66 case BCH_CSUM_OPT_CRC32C:
67 return data ? BCH_CSUM_CRC32C : BCH_CSUM_CRC32C_NONZERO;
68 case BCH_CSUM_OPT_CRC64:
69 return data ? BCH_CSUM_CRC64 : BCH_CSUM_CRC64_NONZERO;
75 static inline enum bch_csum_type bch2_data_checksum_type(struct bch_fs *c,
78 if (c->sb.encryption_type)
79 return c->opts.wide_macs
80 ? BCH_CSUM_CHACHA20_POLY1305_128
81 : BCH_CSUM_CHACHA20_POLY1305_80;
83 return bch2_csum_opt_to_type(opt, true);
86 static inline enum bch_csum_type bch2_meta_checksum_type(struct bch_fs *c)
88 if (c->sb.encryption_type)
89 return BCH_CSUM_CHACHA20_POLY1305_128;
91 return bch2_csum_opt_to_type(c->opts.metadata_checksum, false);
94 static const unsigned bch2_compression_opt_to_type[] = {
95 #define x(t) [BCH_COMPRESSION_OPT_##t] = BCH_COMPRESSION_##t,
96 BCH_COMPRESSION_TYPES()
100 static inline bool bch2_checksum_type_valid(const struct bch_fs *c,
103 if (type >= BCH_CSUM_NR)
106 if (bch2_csum_type_is_encryption(type) && !c->chacha20)
112 static const unsigned bch_crc_bytes[] = {
114 [BCH_CSUM_CRC32C] = 4,
115 [BCH_CSUM_CRC64] = 8,
116 [BCH_CSUM_CHACHA20_POLY1305_80] = 10,
117 [BCH_CSUM_CHACHA20_POLY1305_128] = 16,
120 /* returns true if not equal */
121 static inline bool bch2_crc_cmp(struct bch_csum l, struct bch_csum r)
124 * XXX: need some way of preventing the compiler from optimizing this
125 * into a form that isn't constant time..
127 return ((l.lo ^ r.lo) | (l.hi ^ r.hi)) != 0;
130 /* for skipping ahead and encrypting/decrypting at an offset: */
131 static inline struct nonce nonce_add(struct nonce nonce, unsigned offset)
133 EBUG_ON(offset & (CHACHA20_BLOCK_SIZE - 1));
135 le32_add_cpu(&nonce.d[0], offset / CHACHA20_BLOCK_SIZE);
139 static inline struct nonce null_nonce(void)
143 memset(&ret, 0, sizeof(ret));
147 static inline struct nonce extent_nonce(struct bversion version,
148 struct bch_extent_crc_unpacked crc)
150 unsigned size = crc.compression_type ? crc.uncompressed_size : 0;
151 struct nonce nonce = (struct nonce) {{
152 [0] = cpu_to_le32(size << 22),
153 [1] = cpu_to_le32(version.lo),
154 [2] = cpu_to_le32(version.lo >> 32),
155 [3] = cpu_to_le32(version.hi|
156 (crc.compression_type << 24))^BCH_NONCE_EXTENT,
159 return nonce_add(nonce, crc.nonce << 9);
162 static inline bool bch2_key_is_encrypted(struct bch_encrypted_key *key)
164 return le64_to_cpu(key->magic) != BCH_KEY_MAGIC;
167 static inline struct nonce __bch2_sb_key_nonce(struct bch_sb *sb)
169 __le64 magic = __bch2_sb_magic(sb);
171 return (struct nonce) {{
174 [2] = ((__le32 *) &magic)[0],
175 [3] = ((__le32 *) &magic)[1],
179 static inline struct nonce bch2_sb_key_nonce(struct bch_fs *c)
181 __le64 magic = bch2_sb_magic(c);
183 return (struct nonce) {{
186 [2] = ((__le32 *) &magic)[0],
187 [3] = ((__le32 *) &magic)[1],
191 #endif /* _BCACHEFS_CHECKSUM_H */