--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BCACHEFS_CHECKSUM_H
+#define _BCACHEFS_CHECKSUM_H
+
+#include "bcachefs.h"
+#include "extents_types.h"
+#include "super-io.h"
+
+#include <linux/crc64.h>
+#include <crypto/chacha.h>
+
+static inline bool bch2_checksum_mergeable(unsigned type)
+{
+
+ switch (type) {
+ case BCH_CSUM_none:
+ case BCH_CSUM_crc32c:
+ case BCH_CSUM_crc64:
+ return true;
+ default:
+ return false;
+ }
+}
+
+struct bch_csum bch2_checksum_merge(unsigned, struct bch_csum,
+ struct bch_csum, size_t);
+
+#define BCH_NONCE_EXTENT cpu_to_le32(1 << 28)
+#define BCH_NONCE_BTREE cpu_to_le32(2 << 28)
+#define BCH_NONCE_JOURNAL cpu_to_le32(3 << 28)
+#define BCH_NONCE_PRIO cpu_to_le32(4 << 28)
+#define BCH_NONCE_POLY cpu_to_le32(1 << 31)
+
+struct bch_csum bch2_checksum(struct bch_fs *, unsigned, struct nonce,
+ const void *, size_t);
+
+/*
+ * This is used for various on disk data structures - bch_sb, prio_set, bset,
+ * jset: The checksum is _always_ the first field of these structs
+ */
+#define csum_vstruct(_c, _type, _nonce, _i) \
+({ \
+ const void *_start = ((const void *) (_i)) + sizeof((_i)->csum);\
+ \
+ bch2_checksum(_c, _type, _nonce, _start, vstruct_end(_i) - _start);\
+})
+
+static inline void bch2_csum_to_text(struct printbuf *out,
+ enum bch_csum_type type,
+ struct bch_csum csum)
+{
+ const u8 *p = (u8 *) &csum;
+ unsigned bytes = type < BCH_CSUM_NR ? bch_crc_bytes[type] : 16;
+
+ for (unsigned i = 0; i < bytes; i++)
+ prt_hex_byte(out, p[i]);
+}
+
+static inline void bch2_csum_err_msg(struct printbuf *out,
+ enum bch_csum_type type,
+ struct bch_csum expected,
+ struct bch_csum got)
+{
+ prt_printf(out, "checksum error: got ");
+ bch2_csum_to_text(out, type, got);
+ prt_str(out, " should be ");
+ bch2_csum_to_text(out, type, expected);
+ prt_printf(out, " type %s", bch2_csum_types[type]);
+}
+
+int bch2_chacha_encrypt_key(struct bch_key *, struct nonce, void *, size_t);
+int bch2_request_key(struct bch_sb *, struct bch_key *);
+#ifndef __KERNEL__
+int bch2_revoke_key(struct bch_sb *);
+#endif
+
+int bch2_encrypt(struct bch_fs *, unsigned, struct nonce,
+ void *data, size_t);
+
+struct bch_csum bch2_checksum_bio(struct bch_fs *, unsigned,
+ struct nonce, struct bio *);
+
+int bch2_rechecksum_bio(struct bch_fs *, struct bio *, struct bversion,
+ struct bch_extent_crc_unpacked,
+ struct bch_extent_crc_unpacked *,
+ struct bch_extent_crc_unpacked *,
+ unsigned, unsigned, unsigned);
+
+int __bch2_encrypt_bio(struct bch_fs *, unsigned,
+ struct nonce, struct bio *);
+
+static inline int bch2_encrypt_bio(struct bch_fs *c, unsigned type,
+ struct nonce nonce, struct bio *bio)
+{
+ return bch2_csum_type_is_encryption(type)
+ ? __bch2_encrypt_bio(c, type, nonce, bio)
+ : 0;
+}
+
+extern const struct bch_sb_field_ops bch_sb_field_ops_crypt;
+
+int bch2_decrypt_sb_key(struct bch_fs *, struct bch_sb_field_crypt *,
+ struct bch_key *);
+
+int bch2_disable_encryption(struct bch_fs *);
+int bch2_enable_encryption(struct bch_fs *, bool);
+
+void bch2_fs_encryption_exit(struct bch_fs *);
+int bch2_fs_encryption_init(struct bch_fs *);
+
+static inline enum bch_csum_type bch2_csum_opt_to_type(enum bch_csum_opts type,
+ bool data)
+{
+ switch (type) {
+ case BCH_CSUM_OPT_none:
+ return BCH_CSUM_none;
+ case BCH_CSUM_OPT_crc32c:
+ return data ? BCH_CSUM_crc32c : BCH_CSUM_crc32c_nonzero;
+ case BCH_CSUM_OPT_crc64:
+ return data ? BCH_CSUM_crc64 : BCH_CSUM_crc64_nonzero;
+ case BCH_CSUM_OPT_xxhash:
+ return BCH_CSUM_xxhash;
+ default:
+ BUG();
+ }
+}
+
+static inline enum bch_csum_type bch2_data_checksum_type(struct bch_fs *c,
+ struct bch_io_opts opts)
+{
+ if (opts.nocow)
+ return 0;
+
+ if (c->sb.encryption_type)
+ return c->opts.wide_macs
+ ? BCH_CSUM_chacha20_poly1305_128
+ : BCH_CSUM_chacha20_poly1305_80;
+
+ return bch2_csum_opt_to_type(opts.data_checksum, true);
+}
+
+static inline enum bch_csum_type bch2_meta_checksum_type(struct bch_fs *c)
+{
+ if (c->sb.encryption_type)
+ return BCH_CSUM_chacha20_poly1305_128;
+
+ return bch2_csum_opt_to_type(c->opts.metadata_checksum, false);
+}
+
+static inline bool bch2_checksum_type_valid(const struct bch_fs *c,
+ unsigned type)
+{
+ if (type >= BCH_CSUM_NR)
+ return false;
+
+ if (bch2_csum_type_is_encryption(type) && !c->chacha20)
+ return false;
+
+ return true;
+}
+
+/* returns true if not equal */
+static inline bool bch2_crc_cmp(struct bch_csum l, struct bch_csum r)
+{
+ /*
+ * XXX: need some way of preventing the compiler from optimizing this
+ * into a form that isn't constant time..
+ */
+ return ((l.lo ^ r.lo) | (l.hi ^ r.hi)) != 0;
+}
+
+/* for skipping ahead and encrypting/decrypting at an offset: */
+static inline struct nonce nonce_add(struct nonce nonce, unsigned offset)
+{
+ EBUG_ON(offset & (CHACHA_BLOCK_SIZE - 1));
+
+ le32_add_cpu(&nonce.d[0], offset / CHACHA_BLOCK_SIZE);
+ return nonce;
+}
+
+static inline struct nonce null_nonce(void)
+{
+ struct nonce ret;
+
+ memset(&ret, 0, sizeof(ret));
+ return ret;
+}
+
+static inline struct nonce extent_nonce(struct bversion version,
+ struct bch_extent_crc_unpacked crc)
+{
+ unsigned compression_type = crc_is_compressed(crc)
+ ? crc.compression_type
+ : 0;
+ unsigned size = compression_type ? crc.uncompressed_size : 0;
+ struct nonce nonce = (struct nonce) {{
+ [0] = cpu_to_le32(size << 22),
+ [1] = cpu_to_le32(version.lo),
+ [2] = cpu_to_le32(version.lo >> 32),
+ [3] = cpu_to_le32(version.hi|
+ (compression_type << 24))^BCH_NONCE_EXTENT,
+ }};
+
+ return nonce_add(nonce, crc.nonce << 9);
+}
+
+static inline bool bch2_key_is_encrypted(struct bch_encrypted_key *key)
+{
+ return le64_to_cpu(key->magic) != BCH_KEY_MAGIC;
+}
+
+static inline struct nonce __bch2_sb_key_nonce(struct bch_sb *sb)
+{
+ __le64 magic = __bch2_sb_magic(sb);
+
+ return (struct nonce) {{
+ [0] = 0,
+ [1] = 0,
+ [2] = ((__le32 *) &magic)[0],
+ [3] = ((__le32 *) &magic)[1],
+ }};
+}
+
+static inline struct nonce bch2_sb_key_nonce(struct bch_fs *c)
+{
+ __le64 magic = bch2_sb_magic(c);
+
+ return (struct nonce) {{
+ [0] = 0,
+ [1] = 0,
+ [2] = ((__le32 *) &magic)[0],
+ [3] = ((__le32 *) &magic)[1],
+ }};
+}
+
+#endif /* _BCACHEFS_CHECKSUM_H */
projects / bcachefs-tools-debian / blobdiff