diff options
| -rw-r--r-- | Documentation/device-mapper/dm-crypt.txt | 16 | ||||
| -rw-r--r-- | drivers/md/dm-crypt.c | 882 |
2 files changed, 758 insertions, 140 deletions
diff --git a/Documentation/device-mapper/dm-crypt.txt b/Documentation/device-mapper/dm-crypt.txt index ff1f87b..a2a6627 100644 --- a/Documentation/device-mapper/dm-crypt.txt +++ b/Documentation/device-mapper/dm-crypt.txt @@ -93,6 +93,22 @@ submit_from_crypt_cpus thread because it benefits CFQ to have writes submitted using the same context. +integrity:<bytes>:<type> + Calculates and verifies integrity for the encrypted device (uses + authenticated encryption). This mode requires metadata stored in per-bio + integrity structure of <bytes> in size. + + This option requires that the underlying device is created by dm-integrity + target and provides exactly <bytes> of per-sector metadata. + + There can by two options for <type>. The first one is used when encryption + mode is Authenticated mode (AEAD mode), then type must be just "aead". + The second option is integrity calculated by keyed hash (HMAC), then + <type> is for example "hmac(sha256)". + + If random IV is used (persistently stored IV in metadata per-sector), + then <bytes> includes both space for random IV and authentication tag. + Example scripts =============== LUKS (Linux Unified Key Setup) is now the preferred way to set up disk diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index 389a363..e8e570d 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -1,8 +1,8 @@ /* * Copyright (C) 2003 Jana Saout <jana@saout.de> * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org> - * Copyright (C) 2006-2015 Red Hat, Inc. All rights reserved. - * Copyright (C) 2013 Milan Broz <gmazyland@gmail.com> + * Copyright (C) 2006-2017 Red Hat, Inc. All rights reserved. + * Copyright (C) 2013-2017 Milan Broz <gmazyland@gmail.com> * * This file is released under the GPL. */ @@ -31,6 +31,9 @@ #include <crypto/md5.h> #include <crypto/algapi.h> #include <crypto/skcipher.h> +#include <crypto/aead.h> +#include <crypto/authenc.h> +#include <linux/rtnetlink.h> /* for struct rtattr and RTA macros only */ #include <keys/user-type.h> #include <linux/device-mapper.h> @@ -48,7 +51,11 @@ struct convert_context { struct bvec_iter iter_out; sector_t cc_sector; atomic_t cc_pending; - struct skcipher_request *req; + union { + struct skcipher_request *req; + struct aead_request *req_aead; + } r; + }; /* @@ -57,6 +64,8 @@ struct convert_context { struct dm_crypt_io { struct crypt_config *cc; struct bio *base_bio; + u8 *integrity_metadata; + bool integrity_metadata_from_pool; struct work_struct work; struct convert_context ctx; @@ -70,8 +79,8 @@ struct dm_crypt_io { struct dm_crypt_request { struct convert_context *ctx; - struct scatterlist sg_in; - struct scatterlist sg_out; + struct scatterlist sg_in[4]; + struct scatterlist sg_out[4]; sector_t iv_sector; }; @@ -118,6 +127,11 @@ struct iv_tcw_private { enum flags { DM_CRYPT_SUSPENDED, DM_CRYPT_KEY_VALID, DM_CRYPT_SAME_CPU, DM_CRYPT_NO_OFFLOAD }; +enum cipher_flags { + CRYPT_MODE_INTEGRITY_AEAD, /* Use authenticated mode for cihper */ + CRYPT_MODE_INTEGRITY_HMAC, /* Compose authenticated mode from normal mode and HMAC */ +}; + /* * The fields in here must be read only after initialization. */ @@ -126,11 +140,14 @@ struct crypt_config { sector_t start; /* - * pool for per bio private data, crypto requests and - * encryption requeusts/buffer pages + * pool for per bio private data, crypto requests, + * encryption requeusts/buffer pages and integrity tags */ mempool_t *req_pool; mempool_t *page_pool; + mempool_t *tag_pool; + unsigned tag_pool_max_sectors; + struct bio_set *bs; struct mutex bio_alloc_lock; @@ -143,6 +160,7 @@ struct crypt_config { char *cipher; char *cipher_string; + char *cipher_auth; char *key_string; const struct crypt_iv_operations *iv_gen_ops; @@ -157,8 +175,12 @@ struct crypt_config { /* ESSIV: struct crypto_cipher *essiv_tfm */ void *iv_private; - struct crypto_skcipher **tfms; + union { + struct crypto_skcipher **tfms; + struct crypto_aead **tfms_aead; + } cipher_tfm; unsigned tfms_count; + unsigned long cipher_flags; /* * Layout of each crypto request: @@ -181,21 +203,36 @@ struct crypt_config { unsigned int key_size; unsigned int key_parts; /* independent parts in key buffer */ unsigned int key_extra_size; /* additional keys length */ + unsigned int key_mac_size; /* MAC key size for authenc(...) */ + + unsigned int integrity_tag_size; + unsigned int integrity_iv_size; + unsigned int on_disk_tag_size; + + u8 *authenc_key; /* space for keys in authenc() format (if used) */ u8 key[0]; }; -#define MIN_IOS 64 +#define MIN_IOS 64 +#define MAX_TAG_SIZE 480 +#define POOL_ENTRY_SIZE 512 static void clone_init(struct dm_crypt_io *, struct bio *); static void kcryptd_queue_crypt(struct dm_crypt_io *io); -static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq); +static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc, + struct scatterlist *sg); /* * Use this to access cipher attributes that are the same for each CPU. */ static struct crypto_skcipher *any_tfm(struct crypt_config *cc) { - return cc->tfms[0]; + return cc->cipher_tfm.tfms[0]; +} + +static struct crypto_aead *any_tfm_aead(struct crypt_config *cc) +{ + return cc->cipher_tfm.tfms_aead[0]; } /* @@ -325,8 +362,7 @@ static struct crypto_cipher *setup_essiv_cpu(struct crypt_config *cc, return essiv_tfm; } - if (crypto_cipher_blocksize(essiv_tfm) != - crypto_skcipher_ivsize(any_tfm(cc))) { + if (crypto_cipher_blocksize(essiv_tfm) != cc->iv_size) { ti->error = "Block size of ESSIV cipher does " "not match IV size of block cipher"; crypto_free_cipher(essiv_tfm); @@ -395,6 +431,7 @@ static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti, essiv_tfm = setup_essiv_cpu(cc, ti, salt, crypto_ahash_digestsize(hash_tfm)); + if (IS_ERR(essiv_tfm)) { crypt_iv_essiv_dtr(cc); return PTR_ERR(essiv_tfm); @@ -585,12 +622,14 @@ static int crypt_iv_lmk_one(struct crypt_config *cc, u8 *iv, static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq) { + struct scatterlist *sg; u8 *src; int r = 0; if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) { - src = kmap_atomic(sg_page(&dmreq->sg_in)); - r = crypt_iv_lmk_one(cc, iv, dmreq, src + dmreq->sg_in.offset); + sg = crypt_get_sg_data(cc, dmreq->sg_in); + src = kmap_atomic(sg_page(sg)); + r = crypt_iv_lmk_one(cc, iv, dmreq, src + sg->offset); kunmap_atomic(src); } else memset(iv, 0, cc->iv_size); @@ -601,18 +640,20 @@ static int crypt_iv_lmk_gen(struct crypt_config *cc, u8 *iv, static int crypt_iv_lmk_post(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq) { + struct scatterlist *sg; u8 *dst; int r; if (bio_data_dir(dmreq->ctx->bio_in) == WRITE) return 0; - dst = kmap_atomic(sg_page(&dmreq->sg_out)); - r = crypt_iv_lmk_one(cc, iv, dmreq, dst + dmreq->sg_out.offset); + sg = crypt_get_sg_data(cc, dmreq->sg_out); + dst = kmap_atomic(sg_page(sg)); + r = crypt_iv_lmk_one(cc, iv, dmreq, dst + sg->offset); /* Tweak the first block of plaintext sector */ if (!r) - crypto_xor(dst + dmreq->sg_out.offset, iv, cc->iv_size); + crypto_xor(dst + sg->offset, iv, cc->iv_size); kunmap_atomic(dst); return r; @@ -724,6 +765,7 @@ out: static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq) { + struct scatterlist *sg; struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw; __le64 sector = cpu_to_le64(dmreq->iv_sector); u8 *src; @@ -731,8 +773,9 @@ static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, /* Remove whitening from ciphertext */ if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) { - src = kmap_atomic(sg_page(&dmreq->sg_in)); - r = crypt_iv_tcw_whitening(cc, dmreq, src + dmreq->sg_in.offset); + sg = crypt_get_sg_data(cc, dmreq->sg_in); + src = kmap_atomic(sg_page(sg)); + r = crypt_iv_tcw_whitening(cc, dmreq, src + sg->offset); kunmap_atomic(src); } @@ -748,6 +791,7 @@ static int crypt_iv_tcw_gen(struct crypt_config *cc, u8 *iv, static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv, struct dm_crypt_request *dmreq) { + struct scatterlist *sg; u8 *dst; int r; @@ -755,13 +799,22 @@ static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv, return 0; /* Apply whitening on ciphertext */ - dst = kmap_atomic(sg_page(&dmreq->sg_out)); - r = crypt_iv_tcw_whitening(cc, dmreq, dst + dmreq->sg_out.offset); + sg = crypt_get_sg_data(cc, dmreq->sg_out); + dst = kmap_atomic(sg_page(sg)); + r = crypt_iv_tcw_whitening(cc, dmreq, dst + sg->offset); kunmap_atomic(dst); return r; } +static int crypt_iv_random_gen(struct crypt_config *cc, u8 *iv, + struct dm_crypt_request *dmreq) +{ + /* Used only for writes, there must be an additional space to store IV */ + get_random_bytes(iv, cc->iv_size); + return 0; +} + static const struct crypt_iv_operations crypt_iv_plain_ops = { .generator = crypt_iv_plain_gen }; @@ -806,6 +859,108 @@ static const struct crypt_iv_operations crypt_iv_tcw_ops = { .post = crypt_iv_tcw_post }; +static struct crypt_iv_operations crypt_iv_random_ops = { + .generator = crypt_iv_random_gen +}; + +/* + * Integrity extensions + */ +static bool crypt_integrity_aead(struct crypt_config *cc) +{ + return test_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags); +} + +static bool crypt_integrity_hmac(struct crypt_config *cc) +{ + return test_bit(CRYPT_MODE_INTEGRITY_HMAC, &cc->cipher_flags); +} + +static bool crypt_integrity_mode(struct crypt_config *cc) +{ + return crypt_integrity_aead(cc) || crypt_integrity_hmac(cc); +} + +/* Get sg containing data */ +static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc, + struct scatterlist *sg) +{ + if (unlikely(crypt_integrity_mode(cc))) + return &sg[2]; + + return sg; +} + +static int dm_crypt_integrity_io_alloc(struct dm_crypt_io *io, struct bio *bio) +{ + struct bio_integrity_payload *bip; + unsigned int tag_len; + int ret; + + if (!bio_sectors(bio) || !io->cc->on_disk_tag_size) + return 0; + + bip = bio_integrity_alloc(bio, GFP_NOIO, 1); + if (IS_ERR(bip)) + return PTR_ERR(bip); + + tag_len = io->cc->on_disk_tag_size * bio_sectors(bio); + + bip->bip_iter.bi_size = tag_len; + bip->bip_iter.bi_sector = io->cc->start + io->sector; + + /* We own the metadata, do not let bio_free to release it */ + bip->bip_flags &= ~BIP_BLOCK_INTEGRITY; + + ret = bio_integrity_add_page(bio, virt_to_page(io->integrity_metadata), + tag_len, offset_in_page(io->integrity_metadata)); + if (unlikely(ret != tag_len)) + return -ENOMEM; + + return 0; +} + +static int crypt_integrity_ctr(struct crypt_config *cc, struct dm_target *ti) +{ +#ifdef CONFIG_BLK_DEV_INTEGRITY + struct blk_integrity *bi = blk_get_integrity(cc->dev->bdev->bd_disk); + + /* From now we require underlying device with our integrity profile */ + if (!bi || strcasecmp(bi->profile->name, "DM-DIF-EXT-TAG")) { + ti->error = "Integrity profile not supported."; + return -EINVAL; + } + + if (bi->tag_size != cc->on_disk_tag_size) { + ti->error = "Integrity profile tag size mismatch."; + return -EINVAL; + } + + if (crypt_integrity_mode(cc)) { + cc->integrity_tag_size = cc->on_disk_tag_size - cc->integrity_iv_size; + DMINFO("Integrity AEAD, tag size %u, IV size %u.", + cc->integrity_tag_size, cc->integrity_iv_size); + + if (crypto_aead_setauthsize(any_tfm_aead(cc), cc->integrity_tag_size)) { + ti->error = "Integrity AEAD auth tag size is not supported."; + return -EINVAL; + } + } else if (cc->integrity_iv_size) + DMINFO("Additional per-sector space %u bytes for IV.", + cc->integrity_iv_size); + + if ((cc->integrity_tag_size + cc->integrity_iv_size) != bi->tag_size) { + ti->error = "Not enough space for integrity tag in the profile."; + return -EINVAL; + } + + return 0; +#else + ti->error = "Integrity profile not supported."; + return -EINVAL; +#endif +} + static void crypt_convert_init(struct crypt_config *cc, struct convert_context *ctx, struct bio *bio_out, struct bio *bio_in, @@ -822,58 +977,207 @@ static void crypt_convert_init(struct crypt_config *cc, } static struct dm_crypt_request *dmreq_of_req(struct crypt_config *cc, - struct skcipher_request *req) + void *req) { return (struct dm_crypt_request *)((char *)req + cc->dmreq_start); } -static struct skcipher_request *req_of_dmreq(struct crypt_config *cc, - struct dm_crypt_request *dmreq) +static void *req_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq) { - return (struct skcipher_request *)((char *)dmreq - cc->dmreq_start); + return (void *)((char *)dmreq - cc->dmreq_start); } static u8 *iv_of_dmreq(struct crypt_config *cc, struct dm_crypt_request *dmreq) { - return (u8 *)ALIGN((unsigned long)(dmreq + 1), - crypto_skcipher_alignmask(any_tfm(cc)) + 1); + if (crypt_integrity_mode(cc)) + return (u8 *)ALIGN((unsigned long)(dmreq + 1), + crypto_aead_alignmask(any_tfm_aead(cc)) + 1); + else + return (u8 *)ALIGN((unsigned long)(dmreq + 1), + crypto_skcipher_alignmask(any_tfm(cc)) + 1); } -static int crypt_convert_block(struct crypt_config *cc, - struct convert_context *ctx, - struct skcipher_request *req) +static u8 *org_iv_of_dmreq(struct crypt_config *cc, + struct dm_crypt_request *dmreq) +{ + return iv_of_dmreq(cc, dmreq) + cc->iv_size; +} + +static uint64_t *org_sector_of_dmreq(struct crypt_config *cc, + struct dm_crypt_request *dmreq) +{ + u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + cc->iv_size; + return (uint64_t*) ptr; +} + +static unsigned int *org_tag_of_dmreq(struct crypt_config *cc, + struct dm_crypt_request *dmreq) +{ + u8 *ptr = iv_of_dmreq(cc, dmreq) + cc->iv_size + + cc->iv_size + sizeof(uint64_t); + return (unsigned int*)ptr; +} + +static void *tag_from_dmreq(struct crypt_config *cc, + struct dm_crypt_request *dmreq) +{ + struct convert_context *ctx = dmreq->ctx; + struct dm_crypt_io *io = container_of(ctx, struct dm_crypt_io, ctx); + + return &io->integrity_metadata[*org_tag_of_dmreq(cc, dmreq) * + cc->on_disk_tag_size]; +} + +static void *iv_tag_from_dmreq(struct crypt_config *cc, + struct dm_crypt_request *dmreq) +{ + return tag_from_dmreq(cc, dmreq) + cc->integrity_tag_size; +} + +static int crypt_convert_block_aead(struct crypt_config *cc, + struct convert_context *ctx, + struct aead_request *req, + unsigned int tag_offset) { struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); struct dm_crypt_request *dmreq; - u8 *iv; - int r; + unsigned int data_len = 1 << SECTOR_SHIFT; + u8 *iv, *org_iv, *tag_iv, *tag; + uint64_t *sector; + int r = 0; + + BUG_ON(cc->integrity_iv_size && cc->integrity_iv_size != cc->iv_size); dmreq = dmreq_of_req(cc, req); + dmreq->iv_sector = ctx->cc_sector; + dmreq->ctx = ctx; + + *org_tag_of_dmreq(cc, dmreq) = tag_offset; + + sector = org_sector_of_dmreq(cc, dmreq); + *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset); + iv = iv_of_dmreq(cc, dmreq); + org_iv = org_iv_of_dmreq(cc, dmreq); + tag = tag_from_dmreq(cc, dmreq); + tag_iv = iv_tag_from_dmreq(cc, dmreq); + + /* AEAD request: + * |----- AAD -------|------ DATA -------|-- AUTH TAG --| + * | (authenticated) | (auth+encryption) | | + * | sector_LE | IV | sector in/out | tag in/out | + */ + sg_init_table(dmreq->sg_in, 4); + sg_set_buf(&dmreq->sg_in[0], sector, sizeof(uint64_t)); + sg_set_buf(&dmreq->sg_in[1], org_iv, cc->iv_size); + sg_set_page(&dmreq->sg_in[2], bv_in.bv_page, data_len, bv_in.bv_offset); + sg_set_buf(&dmreq->sg_in[3], tag, cc->integrity_tag_size); + + sg_init_table(dmreq->sg_out, 4); + sg_set_buf(&dmreq->sg_out[0], sector, sizeof(uint64_t)); + sg_set_buf(&dmreq->sg_out[1], org_iv, cc->iv_size); + sg_set_page(&dmreq->sg_out[2], bv_out.bv_page, data_len, bv_out.bv_offset); + sg_set_buf(&dmreq->sg_out[3], tag, cc->integrity_tag_size); + + if (cc->iv_gen_ops) { + /* For READs use IV stored in integrity metadata */ + if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) { + memcpy(org_iv, tag_iv, cc->iv_size); + } else { + r = cc->iv_gen_ops->generator(cc, org_iv, dmreq); + if (r < 0) + return r; + /* Store generated IV in integrity metadata */ + if (cc->integrity_iv_size) + memcpy(tag_iv, org_iv, cc->iv_size); + } + /* Working copy of IV, to be modified in crypto API */ + memcpy(iv, org_iv, cc->iv_size); + } + + aead_request_set_ad(req, sizeof(uint64_t) + cc->iv_size); + if (bio_data_dir(ctx->bio_in) == WRITE) { + aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, + data_len, iv); + r = crypto_aead_encrypt(req); + if (cc->integrity_tag_size + cc->integrity_iv_size != cc->on_disk_tag_size) + memset(tag + cc->integrity_tag_size + cc->integrity_iv_size, 0, + cc->on_disk_tag_size - (cc->integrity_tag_size + cc->integrity_iv_size)); + } else { + aead_request_set_crypt(req, dmreq->sg_in, dmreq->sg_out, + data_len + cc->integrity_tag_size, iv); + r = crypto_aead_decrypt(req); + } + + if (r == -EBADMSG) + DMERR_LIMIT("INTEGRITY AEAD ERROR, sector %llu", + (unsigned long long)le64_to_cpu(*sector)); + + if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) + r = cc->iv_gen_ops->post(cc, org_iv, dmreq); + + bio_advance_iter(ctx->bio_in, &ctx->iter_in, data_len); + bio_advance_iter(ctx->bio_out, &ctx->iter_out, data_len); + return r; +} + +static int crypt_convert_block_skcipher(struct crypt_config *cc, + struct convert_context *ctx, + struct skcipher_request *req, + unsigned int tag_offset) +{ + struct bio_vec bv_in = bio_iter_iovec(ctx->bio_in, ctx->iter_in); + struct bio_vec bv_out = bio_iter_iovec(ctx->bio_out, ctx->iter_out); + struct scatterlist *sg_in, *sg_out; + struct dm_crypt_request *dmreq; + unsigned int data_len = 1 << SECTOR_SHIFT; + u8 *iv, *org_iv, *tag_iv; + uint64_t *sector; + int r = 0; + + dmreq = dmreq_of_req(cc, req); dmreq->iv_sector = ctx->cc_sector; dmreq->ctx = ctx; - sg_init_table(&dmreq->sg_in, 1); - sg_set_page(&dmreq->sg_in, bv_in.bv_page, 1 << SECTOR_SHIFT, - bv_in.bv_offset); - sg_init_table(&dmreq->sg_out, 1); - sg_set_page(&dmreq->sg_out, bv_out.bv_page, 1 << SECTOR_SHIFT, - bv_out.bv_offset); + *org_tag_of_dmreq(cc, dmreq) = tag_offset; + + iv = iv_of_dmreq(cc, dmreq); + org_iv = org_iv_of_dmreq(cc, dmreq); + tag_iv = iv_tag_from_dmreq(cc, dmreq); + + sector = org_sector_of_dmreq(cc, dmreq); + *sector = cpu_to_le64(ctx->cc_sector - cc->iv_offset); + + /* For skcipher we use only the first sg item */ + sg_in = &dmreq->sg_in[0]; + sg_out = &dmreq->sg_out[0]; - bio_advance_iter(ctx->bio_in, &ctx->iter_in, 1 << SECTOR_SHIFT); - bio_advance_iter(ctx->bio_out, &ctx->iter_out, 1 << SECTOR_SHIFT); + sg_init_table(sg_in, 1); + sg_set_page(sg_in, bv_in.bv_page, data_len, bv_in.bv_offset); + + sg_init_table(sg_out, 1); + sg_set_page(sg_out, bv_out.bv_page, data_len, bv_out.bv_offset); if (cc->iv_gen_ops) { - r = cc->iv_gen_ops->generator(cc, iv, dmreq); - if (r < 0) - return r; + /* For READs use IV stored in integrity metadata */ + if (cc->integrity_iv_size && bio_data_dir(ctx->bio_in) != WRITE) { + memcpy(org_iv, tag_iv, cc->integrity_iv_size); + } else { + r = cc->iv_gen_ops->generator(cc, org_iv, dmreq); + if (r < 0) + return r; + /* Store generated IV in integrity metadata */ + if (cc->integrity_iv_size) + memcpy(tag_iv, org_iv, cc->integrity_iv_size); + } + /* Working copy of IV, to be modified in crypto API */ + memcpy(iv, org_iv, cc->iv_size); } - skcipher_request_set_crypt(req, &dmreq->sg_in, &dmreq->sg_out, - 1 << SECTOR_SHIFT, iv); + skcipher_request_set_crypt(req, sg_in, sg_out, data_len, iv); if (bio_data_dir(ctx->bio_in) == WRITE) r = crypto_skcipher_encrypt(req); @@ -881,7 +1185,10 @@ static int crypt_convert_block(struct crypt_config *cc, r = crypto_skcipher_decrypt(req); if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post) - r = cc->iv_gen_ops->post(cc, iv, dmreq); + r = cc->iv_gen_ops->post(cc, org_iv, dmreq); + + bio_advance_iter(ctx->bio_in, &ctx->iter_in, data_len); + bio_advance_iter(ctx->bio_out, &ctx->iter_out, data_len); return r; } @@ -889,27 +1196,53 @@ static int crypt_convert_block(struct crypt_config *cc, static void kcryptd_async_done(struct crypto_async_request *async_req, int error); -static void crypt_alloc_req(struct crypt_config *cc, - struct convert_context *ctx) +static void crypt_alloc_req_skcipher(struct crypt_config *cc, + struct convert_context *ctx) { unsigned key_index = ctx->cc_sector & (cc->tfms_count - 1); - if (!ctx->req) - ctx->req = mempool_alloc(cc->req_pool, GFP_NOIO); + if (!ctx->r.req) + ctx->r.req = mempool_alloc(cc->req_pool, GFP_NOIO); + + skcipher_request_set_tfm(ctx->r.req, cc->cipher_tfm.tfms[key_index]); + + /* + * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs + * requests if driver request queue is full. + */ + skcipher_request_set_callback(ctx->r.req, + CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, + kcryptd_async_done, dmreq_of_req(cc, ctx->r.req)); +} + +static void crypt_alloc_req_aead(struct crypt_config *cc, + struct convert_context *ctx) +{ + if (!ctx->r.req_aead) + ctx->r.req_aead = mempool_alloc(cc->req_pool, GFP_NOIO); - skcipher_request_set_tfm(ctx->req, cc->tfms[key_index]); + aead_request_set_tfm(ctx->r.req_aead, cc->cipher_tfm.tfms_aead[0]); /* * Use REQ_MAY_BACKLOG so a cipher driver internally backlogs * requests if driver request queue is full. */ - skcipher_request_set_callback(ctx->req, + aead_request_set_callback(ctx->r.req_aead, CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, - kcryptd_async_done, dmreq_of_req(cc, ctx->req)); + kcryptd_async_done, dmreq_of_req(cc, ctx->r.req_aead)); +} + +static void crypt_alloc_req(struct crypt_config *cc, + struct convert_context *ctx) +{ + if (crypt_integrity_mode(cc)) + crypt_alloc_req_aead(cc, ctx); + else + crypt_alloc_req_skcipher(cc, ctx); } -static void crypt_free_req(struct crypt_config *cc, - struct skcipher_request *req, struct bio *base_bio) +static void crypt_free_req_skcipher(struct crypt_config *cc, + struct skcipher_request *req, struct bio *base_bio) { struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); @@ -917,12 +1250,30 @@ static void crypt_free_req(struct crypt_config *cc, mempool_free(req, cc->req_pool); } +static void crypt_free_req_aead(struct crypt_config *cc, + struct aead_request *req, struct bio *base_bio) +{ + struct dm_crypt_io *io = dm_per_bio_data(base_bio, cc->per_bio_data_size); + + if ((struct aead_request *)(io + 1) != req) + mempool_free(req, cc->req_pool); +} + +static void crypt_free_req(struct crypt_config *cc, void *req, struct bio *base_bio) +{ + if (crypt_integrity_mode(cc)) + crypt_free_req_aead(cc, req, base_bio); + else + crypt_free_req_skcipher(cc, req, base_bio); +} + /* * Encrypt / decrypt data from one bio to another one (can be the same one) */ static int crypt_convert(struct crypt_config *cc, struct convert_context *ctx) { + unsigned int tag_offset = 0; int r; atomic_set(&ctx->cc_pending, 1); @@ -933,7 +1284,10 @@ static int crypt_convert(struct crypt_config *cc, atomic_inc(&ctx->cc_pending); - r = crypt_convert_block(cc, ctx, ctx->req); + if (crypt_integrity_mode(cc)) + r = crypt_convert_block_aead(cc, ctx, ctx->r.req_aead, tag_offset); + else + r = crypt_convert_block_skcipher(cc, ctx, ctx->r.req, tag_offset); switch (r) { /* @@ -949,8 +1303,9 @@ static int crypt_convert(struct crypt_config *cc, * completion function kcryptd_async_done() will be called. */ case -EINPROGRESS: - ctx->req = NULL; + ctx->r.req = NULL; ctx->cc_sector++; + tag_offset++; continue; /* * The request was already processed (synchronously). @@ -958,13 +1313,21 @@ static int crypt_convert(struct crypt_config *cc, case 0: atomic_dec(&ctx->cc_pending); ctx->cc_sector++; + tag_offset++; cond_resched(); continue; - - /* There was an error while processing the request. */ + /* + * There was a data integrity error. + */ + case -EBADMSG: + atomic_dec(&ctx->cc_pending); + return -EILSEQ; + /* + * There was an error while processing the request. + */ default: atomic_dec(&ctx->cc_pending); - return r; + return -EIO; } } @@ -1005,7 +1368,7 @@ retry: clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); if (!clone) - goto return_clone; + goto out; clone_init(io, clone); @@ -1027,7 +1390,13 @@ retry: remaining_size -= len; } -return_clone: + /* Allocate space for integrity tags */ + if (dm_crypt_integrity_io_alloc(io, clone)) { + crypt_free_buffer_pages(cc, clone); + bio_put(clone); + clone = NULL; + } +out: if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) mutex_unlock(&cc->bio_alloc_lock); @@ -1053,7 +1422,9 @@ static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc, io->base_bio = bio; io->sector = sector; io->error = 0; - io->ctx.req = NULL; + io->ctx.r.req = NULL; + io->integrity_metadata = NULL; + io->integrity_metadata_from_pool = false; atomic_set(&io->io_pending, 0); } @@ -1075,8 +1446,13 @@ static void crypt_dec_pending(struct dm_crypt_io *io) if (!atomic_dec_and_test(&io->io_pending)) return; - if (io->ctx.req) - crypt_free_req(cc, io->ctx.req, base_bio); + if (io->ctx.r.req) + crypt_free_req(cc, io->ctx.r.req, base_bio); + + if (unlikely(io->integrity_metadata_from_pool)) + mempool_free(io->integrity_metadata, io->cc->tag_pool); + else + kfree(io->integrity_metadata); base_bio->bi_error = error; bio_endio(base_bio); @@ -1156,6 +1532,12 @@ static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) clone_init(io, clone); clone->bi_iter.bi_sector = cc->start + io->sector; + if (dm_crypt_integrity_io_alloc(io, clone)) { + crypt_dec_pending(io); + bio_put(clone); + return 1; + } + generic_make_request(clone); return 0; } @@ -1314,8 +1696,8 @@ static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) crypt_inc_pending(io); r = crypt_convert(cc, &io->ctx); - if (r) - io->error = -EIO; + if (r < 0) + io->error = r; crypt_finished = atomic_dec_and_test(&io->ctx.cc_pending); /* Encryption was already finished, submit io now */ @@ -1345,7 +1727,7 @@ static void kcryptd_crypt_read_convert(struct dm_crypt_io *io) r = crypt_convert(cc, &io->ctx); if (r < 0) - io->error = -EIO; + io->error = r; if (atomic_dec_and_test(&io->ctx.cc_pending)) kcryptd_crypt_read_done(io); @@ -1372,9 +1754,13 @@ static void kcryptd_async_done(struct crypto_async_request *async_req, } if (!error && cc->iv_gen_ops && cc->iv_gen_ops->post) - error = cc->iv_gen_ops->post(cc, iv_of_dmreq(cc, dmreq), dmreq); + error = cc->iv_gen_ops->post(cc, org_iv_of_dmreq(cc, dmreq), dmreq); - if (error < 0) + if (error == -EBADMSG) { + DMERR_LIMIT("INTEGRITY AEAD ERROR, sector %llu", + (unsigned long long)le64_to_cpu(*org_sector_of_dmreq(cc, dmreq))); + io->error = -EILSEQ; + } else if (error < 0) io->error = -EIO; crypt_free_req(cc, req_of_dmreq(cc, dmreq), io->base_bio); @@ -1430,37 +1816,59 @@ static int crypt_decode_key(u8 *key, char *hex, unsigned int size) return 0; } -static void crypt_free_tfms(struct crypt_config *cc) +static void crypt_free_tfms_aead(struct crypt_config *cc) +{ + if (!cc->cipher_tfm.tfms_aead) + return; + + if (cc->cipher_tfm.tfms_aead[0] && !IS_ERR(cc->cipher_tfm.tfms_aead[0])) { + crypto_free_aead(cc->cipher_tfm.tfms_aead[0]); + cc->cipher_tfm.tfms_aead[0] = NULL; + } + + kfree(cc->cipher_tfm.tfms_aead); + cc->cipher_tfm.tfms_aead = NULL; +} + +static void crypt_free_tfms_skcipher(struct crypt_config *cc) { unsigned i; - if (!cc->tfms) + if (!cc->cipher_tfm.tfms) return; for (i = 0; i < cc->tfms_count; i++) - if (cc->tfms[i] && !IS_ERR(cc->tfms[i])) { - crypto_free_skcipher(cc->tfms[i]); - cc->tfms[i] = NULL; + if (cc->cipher_tfm.tfms[i] && !IS_ERR(cc->cipher_tfm.tfms[i])) { + crypto_free_skcipher(cc->cipher_tfm.tfms[i]); + cc->cipher_tfm.tfms[i] = NULL; } - kfree(cc->tfms); - cc->tfms = NULL; + kfree(cc->cipher_tfm.tfms); + cc->cipher_tfm.tfms = NULL; } -static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) +static void crypt_free_tfms(struct crypt_config *cc) +{ + if (crypt_integrity_mode(cc)) + crypt_free_tfms_aead(cc); + else + crypt_free_tfms_skcipher(cc); +} + +static int crypt_alloc_tfms_skcipher(struct crypt_config *cc, char *ciphermode) { unsigned i; int err; - cc->tfms = kzalloc(cc->tfms_count * sizeof(struct crypto_skcipher *), - GFP_KERNEL); - if (!cc->tfms) + cc->cipher_tfm.tfms = kzalloc(cc->tfms_count * + sizeof(struct crypto_skcipher *), GFP_KERNEL); + if (!cc->cipher_tfm.tfms) return -ENOMEM; for (i = 0; i < cc->tfms_count; i++) { - cc->tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 0); - if (IS_ERR(cc->tfms[i])) { - err = PTR_ERR(cc->tfms[i]); + cc->cipher_tfm.tfms[i] = crypto_alloc_skcipher(ciphermode, 0, 0); + if (IS_ERR(cc->cipher_tfm.tfms[i])) { + err = PTR_ERR(cc->cipher_tfm.tfms[i]); crypt_free_tfms(cc); return err; } @@ -1469,22 +1877,111 @@ static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) return 0; } +static int crypt_alloc_tfms_aead(struct crypt_config *cc, char *ciphermode) +{ + char *authenc = NULL; + int err; + + cc->cipher_tfm.tfms = kmalloc(sizeof(struct crypto_aead *), GFP_KERNEL); + if (!cc->cipher_tfm.tfms) + return -ENOMEM; + + /* Compose AEAD cipher with autenc(authenticator,cipher) structure */ + if (crypt_integrity_hmac(cc)) { + authenc = kmalloc(CRYPTO_MAX_ALG_NAME, GFP_KERNEL); + if (!authenc) + return -ENOMEM; + err = snprintf(authenc, CRYPTO_MAX_ALG_NAME, + "authenc(%s,%s)", cc->cipher_auth, ciphermode); + if (err < 0) { + kzfree(authenc); + return err; + } + ciphermode = authenc; + } + + cc->cipher_tfm.tfms_aead[0] = crypto_alloc_aead(ciphermode, 0, 0); + if (IS_ERR(cc->cipher_tfm.tfms_aead[0])) { + err = PTR_ERR(cc->cipher_tfm.tfms_aead[0]); + crypt_free_tfms(cc); + return err; + } + + kzfree(authenc); + return 0; +} + +static int crypt_alloc_tfms(struct crypt_config *cc, char *ciphermode) +{ + if (crypt_integrity_mode(cc)) + return crypt_alloc_tfms_aead(cc, ciphermode); + else + return crypt_alloc_tfms_skcipher(cc, ciphermode); +} + +static unsigned crypt_subkey_size(struct crypt_config *cc) +{ + return (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count); +} + +static unsigned crypt_authenckey_size(struct crypt_config *cc) +{ + return crypt_subkey_size(cc) + RTA_SPACE(sizeof(struct crypto_authenc_key_param)); +} + +/* + * If AEAD is composed like authenc(hmac(sha256),xts(aes)), + * the key must be for some reason in special format. + * This funcion converts cc->key to this special format. + */ +static void crypt_copy_authenckey(char *p, const void *key, + unsigned enckeylen, unsigned authkeylen) +{ + struct crypto_authenc_key_param *param; + struct rtattr *rta; + + rta = (struct rtattr *)p; + param = RTA_DATA(rta); + param->enckeylen = cpu_to_be32(enckeylen); + rta->rta_len = RTA_LENGTH(sizeof(*param)); + rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; + p += RTA_SPACE(sizeof(*param)); + memcpy(p, key + enckeylen, authkeylen); + p += authkeylen; + memcpy(p, key, enckeylen); +} + static int crypt_setkey(struct crypt_config *cc) { unsigned subkey_size; int err = 0, i, r; /* Ignore extra keys (which are used for IV etc) */ - subkey_size = (cc->key_size - cc->key_extra_size) >> ilog2(cc->tfms_count); + subkey_size = crypt_subkey_size(cc); + if (crypt_integrity_hmac(cc)) + crypt_copy_authenckey(cc->authenc_key, cc->key, + subkey_size - cc->key_mac_size, + cc->key_mac_size); for (i = 0; i < cc->tfms_count; i++) { - r = crypto_skcipher_setkey(cc->tfms[i], - cc->key + (i * subkey_size), - subkey_size); + if (crypt_integrity_aead(cc)) + r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i], + cc->key + (i * subkey_size), + subkey_size); + else if (crypt_integrity_hmac(cc)) + r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i], + cc->authenc_key, crypt_authenckey_size(cc)); + else + r = crypto_skcipher_setkey(cc->cipher_tfm.tfms[i], + cc->key + (i * subkey_size), + subkey_size); if (r) err = r; } + if (crypt_integrity_hmac(cc)) + memzero_explicit(cc->authenc_key, crypt_authenckey_size(cc)); + return err; } @@ -1681,6 +2178,7 @@ static void crypt_dtr(struct dm_target *ti) mempool_destroy(cc->page_pool); mempool_destroy(cc->req_pool); + mempool_destroy(cc->tag_pool); if (cc->iv_gen_ops && cc->iv_gen_ops->dtr) cc->iv_gen_ops->dtr(cc); @@ -1691,6 +2189,8 @@ static void crypt_dtr(struct dm_target *ti) kzfree(cc->cipher); kzfree(cc->cipher_string); kzfree(cc->key_string); + kzfree(cc->cipher_auth); + kzfree(cc->authenc_key); /* Must zero key material before freeing */ kzfree(cc); @@ -1731,7 +2231,6 @@ static int crypt_ctr_cipher(struct dm_target *ti, return -EINVAL; } cc->key_parts = cc->tfms_count; - cc->key_extra_size = 0; cc->cipher = kstrdup(cipher, GFP_KERNEL); if (!cc->cipher) @@ -1777,7 +2276,20 @@ static int crypt_ctr_cipher(struct dm_target *ti, } /* Initialize IV */ - cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); + if (crypt_integrity_mode(cc)) + cc->iv_size = crypto_aead_ivsize(any_tfm_aead(cc)); + else + cc->iv_size = crypto_skcipher_ivsize(any_tfm(cc)); + + if (crypt_integrity_hmac(cc)) { + cc->authenc_key = kmalloc(crypt_authenckey_size(cc), GFP_KERNEL); + if (!cc->authenc_key) { + ret = -ENOMEM; + ti->error = "Error allocating authenc key space"; + goto bad; + } + } + if (cc->iv_size) /* at least a 64 bit sector number should fit in our buffer */ cc->iv_size = max(cc->iv_size, @@ -1816,6 +2328,10 @@ static int crypt_ctr_cipher(struct dm_target *ti, cc->iv_gen_ops = &crypt_iv_tcw_ops; cc->key_parts += 2; /* IV + whitening */ cc->key_extra_size = cc->iv_size + TCW_WHITENING_SIZE; + } else if (strcmp(ivmode, "random") == 0) { + cc->iv_gen_ops = &crypt_iv_random_ops; + /* Need storage space in integrity fields. */ + cc->integrity_iv_size = cc->iv_size; } else { ret = -EINVAL; ti->error = "Invalid IV mode"; @@ -1857,6 +2373,75 @@ bad_mem: return -ENOMEM; } +static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **argv) +{ + struct crypt_config *cc = ti->private; + struct dm_arg_set as; + static struct dm_arg _args[] = { + {0, 3, "Invalid number of feature args"}, + }; + unsigned int opt_params, val; + const char *opt_string, *sval; + int ret; + + /* Optional parameters */ + as.argc = argc; + as.argv = argv; + + ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); + if (ret) + return ret; + + while (opt_params--) { + opt_string = dm_shift_arg(&as); + if (!opt_string) { + ti->error = "Not enough feature arguments"; + return -EINVAL; + } + + if (!strcasecmp(opt_string, "allow_discards")) + ti->num_discard_bios = 1; + + else if (!strcasecmp(opt_string, "same_cpu_crypt")) + set_bit(DM_CRYPT_SAME_CPU, &cc->flags); + + else if (!strcasecmp(opt_string, "submit_from_crypt_cpus")) + set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); + else if (sscanf(opt_string, "integrity:%u:", &val) == 1) { + if (val == 0 || val > MAX_TAG_SIZE) { + ti->error = "Invalid integrity arguments"; + return -EINVAL; + } + cc->on_disk_tag_size = val; + sval = strchr(opt_string + strlen("integrity:"), ':') + 1; + if (!strcasecmp(sval, "aead")) { + set_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags); + } else if (!strncasecmp(sval, "hmac(", strlen("hmac("))) { + struct crypto_ahash *hmac_tfm = crypto_alloc_ahash(sval, 0, 0); + if (IS_ERR(hmac_tfm)) { + ti->error = "Error initializing HMAC integrity hash."; + return PTR_ERR(hmac_tfm); + } + cc->key_mac_size = crypto_ahash_digestsize(hmac_tfm); + crypto_free_ahash(hmac_tfm); + set_bit(CRYPT_MODE_INTEGRITY_HMAC, &cc->cipher_flags); + } else if (strcasecmp(sval, "none")) { + ti->error = "Unknown integrity profile"; + return -EINVAL; + } + + cc->cipher_auth = kstrdup(sval, GFP_KERNEL); + if (!cc->cipher_auth) + return -ENOMEM; + } else { + ti->error = "Invalid feature arguments"; + return -EINVAL; + } + } + + return 0; +} + /* * Construct an encryption mapping: * <cipher> [<key>|:<key_size>:<user|logon>:<key_description>] <iv_offset> <dev_path> <start> @@ -1865,18 +2450,12 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) { struct crypt_config *cc; int key_size; - unsigned int opt_params; + unsigned int align_mask; unsigned long long tmpll; int ret; - size_t iv_size_padding; - struct dm_arg_set as; - const char *opt_string; + size_t iv_size_padding, additional_req_size; char dummy; - static struct dm_arg _args[] = { - {0, 3, "Invalid number of feature args"}, - }; - if (argc < 5) { ti->error = "Not enough arguments"; return -EINVAL; @@ -1896,38 +2475,59 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) cc->key_size = key_size; ti->private = cc; + + /* Optional parameters need to be read before cipher constructor */ + if (argc > 5) { + ret = crypt_ctr_optional(ti, argc - 5, &argv[5]); + if (ret) + goto bad; + } + ret = crypt_ctr_cipher(ti, argv[0], argv[1]); if (ret < 0) goto bad; - cc->dmreq_start = sizeof(struct skcipher_request); - cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc)); + if (crypt_integrity_mode(cc)) { + cc->dmreq_start = sizeof(struct aead_request); + cc->dmreq_start += crypto_aead_reqsize(any_tfm_aead(cc)); + align_mask = crypto_aead_alignmask(any_tfm_aead(cc)); + } else { + cc->dmreq_start = sizeof(struct skcipher_request); + cc->dmreq_start += crypto_skcipher_reqsize(any_tfm(cc)); + align_mask = crypto_skcipher_alignmask(any_tfm(cc)); + } cc->dmreq_start = ALIGN(cc->dmreq_start, __alignof__(struct dm_crypt_request)); - if (crypto_skcipher_alignmask(any_tfm(cc)) < CRYPTO_MINALIGN) { + if (align_mask < CRYPTO_MINALIGN) { /* Allocate the padding exactly */ iv_size_padding = -(cc->dmreq_start + sizeof(struct dm_crypt_request)) - & crypto_skcipher_alignmask(any_tfm(cc)); + & align_mask; } else { /* * If the cipher requires greater alignment than kmalloc * alignment, we don't know the exact position of the * initialization vector. We must assume worst case. */ - iv_size_padding = crypto_skcipher_alignmask(any_tfm(cc)); + iv_size_padding = align_mask; } ret = -ENOMEM; - cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + - sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size); + + /* ...| IV + padding | original IV | original sec. number | bio tag offset | */ + additional_req_size = sizeof(struct dm_crypt_request) + + iv_size_padding + cc->iv_size + + cc->iv_size + + sizeof(uint64_t) + + sizeof(unsigned int); + + cc->req_pool = mempool_create_kmalloc_pool(MIN_IOS, cc->dmreq_start + additional_req_size); if (!cc->req_pool) { ti->error = "Cannot allocate crypt request mempool"; goto bad; } cc->per_bio_data_size = ti->per_io_data_size = - ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + - sizeof(struct dm_crypt_request) + iv_size_padding + cc->iv_size, + ALIGN(sizeof(struct dm_crypt_io) + cc->dmreq_start + additional_req_size, ARCH_KMALLOC_MINALIGN); cc->page_pool = mempool_create_page_pool(BIO_MAX_PAGES, 0); @@ -1964,39 +2564,20 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) } cc->start = tmpll; - argv += 5; - argc -= 5; - - /* Optional parameters */ - if (argc) { - as.argc = argc; - as.argv = argv; - - ret = dm_read_arg_group(_args, &as, &opt_params, &ti->error); + if (crypt_integrity_mode(cc) || cc->integrity_iv_size) { + ret = crypt_integrity_ctr(cc, ti); if (ret) goto bad; - ret = -EINVAL; - while (opt_params--) { - opt_string = dm_shift_arg(&as); - if (!opt_string) { - ti->error = "Not enough feature arguments"; - goto bad; - } - - if (!strcasecmp(opt_string, "allow_discards")) - ti->num_discard_bios = 1; - - else if (!strcasecmp(opt_string, "same_cpu_crypt")) - set_bit(DM_CRYPT_SAME_CPU, &cc->flags); + cc->tag_pool_max_sectors = POOL_ENTRY_SIZE / cc->on_disk_tag_size; + if (!cc->tag_pool_max_sectors) + cc->tag_pool_max_sectors = 1; - else if (!strcasecmp(opt_string, "submit_from_crypt_cpus")) - set_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); - - else { - ti->error = "Invalid feature arguments"; - goto bad; - } + cc->tag_pool = mempool_create_kmalloc_pool(MIN_IOS, + cc->tag_pool_max_sectors * cc->on_disk_tag_size); + if (!cc->tag_pool) { + ti->error = "Cannot allocate integrity tags mempool"; + goto bad; } } @@ -2062,12 +2643,29 @@ static int crypt_map(struct dm_target *ti, struct bio *bio) * Check if bio is too large, split as needed. */ if (unlikely(bio->bi_iter.bi_size > (BIO_MAX_PAGES << PAGE_SHIFT)) && - bio_data_dir(bio) == WRITE) + (bio_data_dir(bio) == WRITE || cc->on_disk_tag_size)) dm_accept_partial_bio(bio, ((BIO_MAX_PAGES << PAGE_SHIFT) >> SECTOR_SHIFT)); io = dm_per_bio_data(bio, cc->per_bio_data_size); crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector)); - io->ctx.req = (struct skcipher_request *)(io + 1); + + if (cc->on_disk_tag_size) { + unsigned tag_len = cc->on_disk_tag_size * bio_sectors(bio); + + if (unlikely(tag_len > KMALLOC_MAX_SIZE) || + unlikely(!(io->integrity_metadata = kmalloc(tag_len, + GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN)))) { + if (bio_sectors(bio) > cc->tag_pool_max_sectors) + dm_accept_partial_bio(bio, cc->tag_pool_max_sectors); + io->integrity_metadata = mempool_alloc(cc->tag_pool, GFP_NOIO); + io->integrity_metadata_from_pool = true; + } + } + + if (crypt_integrity_mode(cc)) + io->ctx.r.req_aead = (struct aead_request *)(io + 1); + else + io->ctx.r.req = (struct skcipher_request *)(io + 1); if (bio_data_dir(io->base_bio) == READ) { if (kcryptd_io_read(io, GFP_NOWAIT)) @@ -2108,6 +2706,8 @@ static void crypt_status(struct dm_target *ti, status_type_t type, num_feature_args += !!ti->num_discard_bios; num_feature_args += test_bit(DM_CRYPT_SAME_CPU, &cc->flags); num_feature_args += test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags); + if (cc->on_disk_tag_size) + num_feature_args++; if (num_feature_args) { DMEMIT(" %d", num_feature_args); if (ti->num_discard_bios) @@ -2116,6 +2716,8 @@ static void crypt_status(struct dm_target *ti, status_type_t type, DMEMIT(" same_cpu_crypt"); if (test_bit(DM_CRYPT_NO_OFFLOAD, &cc->flags)) DMEMIT(" submit_from_crypt_cpus"); + if (cc->on_disk_tag_size) + DMEMIT(" integrity:%u:%s", cc->on_disk_tag_size, cc->cipher_auth); } break; @@ -2216,7 +2818,7 @@ static void crypt_io_hints(struct dm_target *ti, struct queue_limits *limits) static struct target_type crypt_target = { .name = "crypt", - .version = {1, 15, 0}, + .version = {1, 16, 0}, .module = THIS_MODULE, .ctr = crypt_ctr, .dtr = crypt_dtr, |
