dm crypt: use async crypto
dm-crypt: Use crypto ablkcipher interface Move encrypt/decrypt core to async crypto call. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Milan Broz
Alasdair G Kergon
parent
95497a9600
commit
3a7f6c990a
1 changed files with 72 additions and 59 deletions
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@ -123,7 +123,7 @@ struct crypt_config {
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char cipher[CRYPTO_MAX_ALG_NAME];
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char chainmode[CRYPTO_MAX_ALG_NAME];
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struct crypto_blkcipher *tfm;
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struct crypto_ablkcipher *tfm;
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unsigned long flags;
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unsigned int key_size;
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u8 key[0];
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@ -217,7 +217,7 @@ static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti,
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return PTR_ERR(essiv_tfm);
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}
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if (crypto_cipher_blocksize(essiv_tfm) !=
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crypto_blkcipher_ivsize(cc->tfm)) {
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crypto_ablkcipher_ivsize(cc->tfm)) {
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ti->error = "Block size of ESSIV cipher does "
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"not match IV size of block cipher";
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crypto_free_cipher(essiv_tfm);
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@ -254,7 +254,7 @@ static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, sector_t sector)
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static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti,
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const char *opts)
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{
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unsigned int bs = crypto_blkcipher_blocksize(cc->tfm);
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unsigned bs = crypto_ablkcipher_blocksize(cc->tfm);
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int log = ilog2(bs);
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/* we need to calculate how far we must shift the sector count
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@ -318,38 +318,6 @@ static struct crypt_iv_operations crypt_iv_null_ops = {
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.generator = crypt_iv_null_gen
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};
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static int
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crypt_convert_scatterlist(struct crypt_config *cc, struct scatterlist *out,
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struct scatterlist *in, unsigned int length,
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int write, sector_t sector)
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{
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u8 iv[cc->iv_size] __attribute__ ((aligned(__alignof__(u64))));
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struct blkcipher_desc desc = {
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.tfm = cc->tfm,
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.info = iv,
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.flags = CRYPTO_TFM_REQ_MAY_SLEEP,
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};
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int r;
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if (cc->iv_gen_ops) {
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r = cc->iv_gen_ops->generator(cc, iv, sector);
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if (r < 0)
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return r;
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if (write)
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r = crypto_blkcipher_encrypt_iv(&desc, out, in, length);
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else
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r = crypto_blkcipher_decrypt_iv(&desc, out, in, length);
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} else {
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if (write)
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r = crypto_blkcipher_encrypt(&desc, out, in, length);
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else
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r = crypto_blkcipher_decrypt(&desc, out, in, length);
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}
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return r;
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}
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static void crypt_convert_init(struct crypt_config *cc,
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struct convert_context *ctx,
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struct bio *bio_out, struct bio *bio_in,
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@ -374,18 +342,25 @@ static void crypt_convert_init(struct crypt_config *cc,
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}
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static int crypt_convert_block(struct crypt_config *cc,
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struct convert_context *ctx)
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struct convert_context *ctx,
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struct ablkcipher_request *req)
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{
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struct bio_vec *bv_in = bio_iovec_idx(ctx->bio_in, ctx->idx_in);
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struct bio_vec *bv_out = bio_iovec_idx(ctx->bio_out, ctx->idx_out);
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struct dm_crypt_request dmreq;
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struct dm_crypt_request *dmreq;
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u8 *iv;
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int r = 0;
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sg_init_table(&dmreq.sg_in, 1);
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sg_set_page(&dmreq.sg_in, bv_in->bv_page, 1 << SECTOR_SHIFT,
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dmreq = (struct dm_crypt_request *)((char *)req + cc->dmreq_start);
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iv = (u8 *)ALIGN((unsigned long)(dmreq + 1),
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crypto_ablkcipher_alignmask(cc->tfm) + 1);
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sg_init_table(&dmreq->sg_in, 1);
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sg_set_page(&dmreq->sg_in, bv_in->bv_page, 1 << SECTOR_SHIFT,
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bv_in->bv_offset + ctx->offset_in);
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sg_init_table(&dmreq.sg_out, 1);
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sg_set_page(&dmreq.sg_out, bv_out->bv_page, 1 << SECTOR_SHIFT,
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sg_init_table(&dmreq->sg_out, 1);
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sg_set_page(&dmreq->sg_out, bv_out->bv_page, 1 << SECTOR_SHIFT,
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bv_out->bv_offset + ctx->offset_out);
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ctx->offset_in += 1 << SECTOR_SHIFT;
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@ -400,10 +375,21 @@ static int crypt_convert_block(struct crypt_config *cc,
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ctx->idx_out++;
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}
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return crypt_convert_scatterlist(cc, &dmreq.sg_out, &dmreq.sg_in,
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dmreq.sg_in.length,
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bio_data_dir(ctx->bio_in) == WRITE,
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ctx->sector);
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if (cc->iv_gen_ops) {
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r = cc->iv_gen_ops->generator(cc, iv, ctx->sector);
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if (r < 0)
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return r;
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}
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ablkcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out,
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1 << SECTOR_SHIFT, iv);
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if (bio_data_dir(ctx->bio_in) == WRITE)
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r = crypto_ablkcipher_encrypt(req);
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else
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r = crypto_ablkcipher_decrypt(req);
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return r;
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}
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static void kcryptd_async_done(struct crypto_async_request *async_req,
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@ -429,11 +415,27 @@ static int crypt_convert(struct crypt_config *cc,
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while(ctx->idx_in < ctx->bio_in->bi_vcnt &&
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ctx->idx_out < ctx->bio_out->bi_vcnt) {
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r = crypt_convert_block(cc, ctx);
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if (r < 0)
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break;
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ctx->sector++;
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crypt_alloc_req(cc, ctx);
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r = crypt_convert_block(cc, ctx, cc->req);
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switch (r) {
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case -EBUSY:
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wait_for_completion(&ctx->restart);
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INIT_COMPLETION(ctx->restart);
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/* fall through*/
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case -EINPROGRESS:
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atomic_inc(&ctx->pending);
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cc->req = NULL;
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r = 0;
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/* fall through*/
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case 0:
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ctx->sector++;
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continue;
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}
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break;
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}
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/*
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@ -696,9 +698,12 @@ static void kcryptd_crypt_write_convert_loop(struct dm_crypt_io *io)
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r = crypt_convert(cc, &io->ctx);
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kcryptd_crypt_write_io_submit(io, r, 0);
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if (unlikely(r < 0))
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return;
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if (r != -EINPROGRESS) {
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kcryptd_crypt_write_io_submit(io, r, 0);
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if (unlikely(r < 0))
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return;
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} else
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atomic_inc(&io->pending);
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/* out of memory -> run queues */
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if (unlikely(remaining))
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@ -734,12 +739,17 @@ static void kcryptd_crypt_read_convert(struct dm_crypt_io *io)
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struct crypt_config *cc = io->target->private;
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int r = 0;
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atomic_inc(&io->pending);
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crypt_convert_init(cc, &io->ctx, io->base_bio, io->base_bio,
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io->sector);
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r = crypt_convert(cc, &io->ctx);
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kcryptd_crypt_read_done(io, r);
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if (r != -EINPROGRESS)
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kcryptd_crypt_read_done(io, r);
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crypt_dec_pending(io);
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}
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static void kcryptd_async_done(struct crypto_async_request *async_req,
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@ -856,7 +866,7 @@ static int crypt_wipe_key(struct crypt_config *cc)
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static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
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{
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struct crypt_config *cc;
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struct crypto_blkcipher *tfm;
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struct crypto_ablkcipher *tfm;
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char *tmp;
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char *cipher;
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char *chainmode;
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@ -910,7 +920,7 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
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goto bad_cipher;
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}
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tfm = crypto_alloc_blkcipher(cc->cipher, 0, CRYPTO_ALG_ASYNC);
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tfm = crypto_alloc_ablkcipher(cc->cipher, 0, 0);
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if (IS_ERR(tfm)) {
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ti->error = "Error allocating crypto tfm";
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goto bad_cipher;
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@ -944,7 +954,7 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
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cc->iv_gen_ops->ctr(cc, ti, ivopts) < 0)
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goto bad_ivmode;
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cc->iv_size = crypto_blkcipher_ivsize(tfm);
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cc->iv_size = crypto_ablkcipher_ivsize(tfm);
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if (cc->iv_size)
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/* at least a 64 bit sector number should fit in our buffer */
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cc->iv_size = max(cc->iv_size,
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@ -965,7 +975,10 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
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}
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cc->dmreq_start = sizeof(struct ablkcipher_request);
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cc->dmreq_start += crypto_ablkcipher_reqsize(tfm);
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cc->dmreq_start = ALIGN(cc->dmreq_start, crypto_tfm_ctx_alignment());
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cc->dmreq_start += crypto_ablkcipher_alignmask(tfm) &
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~(crypto_tfm_ctx_alignment() - 1);
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cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start +
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sizeof(struct dm_crypt_request) + cc->iv_size);
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@ -987,7 +1000,7 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
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goto bad_bs;
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}
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if (crypto_blkcipher_setkey(tfm, cc->key, key_size) < 0) {
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if (crypto_ablkcipher_setkey(tfm, cc->key, key_size) < 0) {
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ti->error = "Error setting key";
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goto bad_device;
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}
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@ -1055,7 +1068,7 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
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if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
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cc->iv_gen_ops->dtr(cc);
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bad_ivmode:
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crypto_free_blkcipher(tfm);
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crypto_free_ablkcipher(tfm);
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bad_cipher:
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/* Must zero key material before freeing */
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memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8));
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@ -1081,7 +1094,7 @@ static void crypt_dtr(struct dm_target *ti)
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kfree(cc->iv_mode);
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if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
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cc->iv_gen_ops->dtr(cc);
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crypto_free_blkcipher(cc->tfm);
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crypto_free_ablkcipher(cc->tfm);
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dm_put_device(ti, cc->dev);
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/* Must zero key material before freeing */
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