diff options
author | Marcelo Cerri <mhcerri@linux.vnet.ibm.com> | 2013-08-29 11:36:35 -0300 |
---|---|---|
committer | Herbert Xu <herbert@gondor.apana.org.au> | 2013-09-02 20:32:54 +1000 |
commit | 799804348d11763b84213156318bb92cb955bfb5 (patch) | |
tree | 3e73f3e3f4eaef22648b36fa02c7136191db14c1 /drivers | |
parent | 884d981b04f3c00f61f4efaf9a93103e01260685 (diff) |
crypto: nx - fix limits to sg lists for AES-GCM
This patch updates the nx-aes-gcm implementation to perform several
hyper calls if needed in order to always respect the length limits for
scatter/gather lists.
Two different limits are considered:
- "ibm,max-sg-len": maximum number of bytes of each scatter/gather
list.
- "ibm,max-sync-cop":
- The total number of bytes that a scatter/gather list can hold.
- The maximum number of elements that a scatter/gather list can have.
Reviewed-by: Joy Latten <jmlatten@linux.vnet.ibm.com>
Signed-off-by: Marcelo Cerri <mhcerri@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/crypto/nx/nx-aes-gcm.c | 202 |
1 files changed, 136 insertions, 66 deletions
diff --git a/drivers/crypto/nx/nx-aes-gcm.c b/drivers/crypto/nx/nx-aes-gcm.c index c2d6f76e3677..9e89bdf34487 100644 --- a/drivers/crypto/nx/nx-aes-gcm.c +++ b/drivers/crypto/nx/nx-aes-gcm.c @@ -125,37 +125,101 @@ static int nx_gca(struct nx_crypto_ctx *nx_ctx, struct aead_request *req, u8 *out) { + int rc; struct nx_csbcpb *csbcpb_aead = nx_ctx->csbcpb_aead; - int rc = -EINVAL; struct scatter_walk walk; struct nx_sg *nx_sg = nx_ctx->in_sg; + unsigned int nbytes = req->assoclen; + unsigned int processed = 0, to_process; + u32 max_sg_len; - if (req->assoclen > nx_ctx->ap->databytelen) - goto out; - - if (req->assoclen <= AES_BLOCK_SIZE) { + if (nbytes <= AES_BLOCK_SIZE) { scatterwalk_start(&walk, req->assoc); - scatterwalk_copychunks(out, &walk, req->assoclen, - SCATTERWALK_FROM_SG); + scatterwalk_copychunks(out, &walk, nbytes, SCATTERWALK_FROM_SG); scatterwalk_done(&walk, SCATTERWALK_FROM_SG, 0); - - rc = 0; - goto out; + return 0; } - nx_sg = nx_walk_and_build(nx_sg, nx_ctx->ap->sglen, req->assoc, 0, - req->assoclen); - nx_ctx->op_aead.inlen = (nx_ctx->in_sg - nx_sg) * sizeof(struct nx_sg); + NX_CPB_FDM(csbcpb_aead) &= ~NX_FDM_CONTINUATION; - rc = nx_hcall_sync(nx_ctx, &nx_ctx->op_aead, - req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP); - if (rc) - goto out; + /* page_limit: number of sg entries that fit on one page */ + max_sg_len = min_t(u32, nx_driver.of.max_sg_len/sizeof(struct nx_sg), + nx_ctx->ap->sglen); - atomic_inc(&(nx_ctx->stats->aes_ops)); - atomic64_add(req->assoclen, &(nx_ctx->stats->aes_bytes)); + do { + /* + * to_process: the data chunk to process in this update. + * This value is bound by sg list limits. + */ + to_process = min_t(u64, nbytes - processed, + nx_ctx->ap->databytelen); + to_process = min_t(u64, to_process, + NX_PAGE_SIZE * (max_sg_len - 1)); + + if ((to_process + processed) < nbytes) + NX_CPB_FDM(csbcpb_aead) |= NX_FDM_INTERMEDIATE; + else + NX_CPB_FDM(csbcpb_aead) &= ~NX_FDM_INTERMEDIATE; + + nx_sg = nx_walk_and_build(nx_ctx->in_sg, nx_ctx->ap->sglen, + req->assoc, processed, to_process); + nx_ctx->op_aead.inlen = (nx_ctx->in_sg - nx_sg) + * sizeof(struct nx_sg); + + rc = nx_hcall_sync(nx_ctx, &nx_ctx->op_aead, + req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP); + if (rc) + return rc; + + memcpy(csbcpb_aead->cpb.aes_gca.in_pat, + csbcpb_aead->cpb.aes_gca.out_pat, + AES_BLOCK_SIZE); + NX_CPB_FDM(csbcpb_aead) |= NX_FDM_CONTINUATION; + + atomic_inc(&(nx_ctx->stats->aes_ops)); + atomic64_add(req->assoclen, &(nx_ctx->stats->aes_bytes)); + + processed += to_process; + } while (processed < nbytes); memcpy(out, csbcpb_aead->cpb.aes_gca.out_pat, AES_BLOCK_SIZE); + + return rc; +} + +static int gcm_empty(struct aead_request *req, struct blkcipher_desc *desc, + int enc) +{ + int rc; + struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm); + struct nx_csbcpb *csbcpb = nx_ctx->csbcpb; + + /* For scenarios where the input message is zero length, AES CTR mode + * may be used. Set the source data to be a single block (16B) of all + * zeros, and set the input IV value to be the same as the GMAC IV + * value. - nx_wb 4.8.1.3 */ + char src[AES_BLOCK_SIZE] = {}; + struct scatterlist sg; + + desc->tfm = crypto_alloc_blkcipher("ctr(aes)", 0, 0); + if (IS_ERR(desc->tfm)) { + rc = -ENOMEM; + goto out; + } + + crypto_blkcipher_setkey(desc->tfm, csbcpb->cpb.aes_gcm.key, + NX_CPB_KEY_SIZE(csbcpb) == NX_KS_AES_128 ? 16 : + NX_CPB_KEY_SIZE(csbcpb) == NX_KS_AES_192 ? 24 : 32); + + sg_init_one(&sg, src, AES_BLOCK_SIZE); + if (enc) + rc = crypto_blkcipher_encrypt_iv(desc, req->dst, &sg, + AES_BLOCK_SIZE); + else + rc = crypto_blkcipher_decrypt_iv(desc, req->dst, &sg, + AES_BLOCK_SIZE); + crypto_free_blkcipher(desc->tfm); + out: return rc; } @@ -166,79 +230,85 @@ static int gcm_aes_nx_crypt(struct aead_request *req, int enc) struct nx_csbcpb *csbcpb = nx_ctx->csbcpb; struct blkcipher_desc desc; unsigned int nbytes = req->cryptlen; + unsigned int processed = 0, to_process; unsigned long irq_flags; + u32 max_sg_len; int rc = -EINVAL; spin_lock_irqsave(&nx_ctx->lock, irq_flags); - if (nbytes > nx_ctx->ap->databytelen) - goto out; - desc.info = nx_ctx->priv.gcm.iv; /* initialize the counter */ *(u32 *)(desc.info + NX_GCM_CTR_OFFSET) = 1; - /* For scenarios where the input message is zero length, AES CTR mode - * may be used. Set the source data to be a single block (16B) of all - * zeros, and set the input IV value to be the same as the GMAC IV - * value. - nx_wb 4.8.1.3 */ if (nbytes == 0) { - char src[AES_BLOCK_SIZE] = {}; - struct scatterlist sg; - - desc.tfm = crypto_alloc_blkcipher("ctr(aes)", 0, 0); - if (IS_ERR(desc.tfm)) { - rc = -ENOMEM; - goto out; - } - - crypto_blkcipher_setkey(desc.tfm, csbcpb->cpb.aes_gcm.key, - NX_CPB_KEY_SIZE(csbcpb) == NX_KS_AES_128 ? 16 : - NX_CPB_KEY_SIZE(csbcpb) == NX_KS_AES_192 ? 24 : 32); - - sg_init_one(&sg, src, AES_BLOCK_SIZE); - if (enc) - crypto_blkcipher_encrypt_iv(&desc, req->dst, &sg, - AES_BLOCK_SIZE); - else - crypto_blkcipher_decrypt_iv(&desc, req->dst, &sg, - AES_BLOCK_SIZE); - crypto_free_blkcipher(desc.tfm); - - rc = 0; + rc = gcm_empty(req, &desc, enc); goto out; } - desc.tfm = (struct crypto_blkcipher *)req->base.tfm; - + /* Process associated data */ csbcpb->cpb.aes_gcm.bit_length_aad = req->assoclen * 8; - if (req->assoclen) { rc = nx_gca(nx_ctx, req, csbcpb->cpb.aes_gcm.in_pat_or_aad); if (rc) goto out; } - if (enc) + /* Set flags for encryption */ + NX_CPB_FDM(csbcpb) &= ~NX_FDM_CONTINUATION; + if (enc) { NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT; - else + } else { + NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT; nbytes -= crypto_aead_authsize(crypto_aead_reqtfm(req)); + } - csbcpb->cpb.aes_gcm.bit_length_data = nbytes * 8; + /* page_limit: number of sg entries that fit on one page */ + max_sg_len = min_t(u32, nx_driver.of.max_sg_len/sizeof(struct nx_sg), + nx_ctx->ap->sglen); + + do { + /* + * to_process: the data chunk to process in this update. + * This value is bound by sg list limits. + */ + to_process = min_t(u64, nbytes - processed, + nx_ctx->ap->databytelen); + to_process = min_t(u64, to_process, + NX_PAGE_SIZE * (max_sg_len - 1)); + + if ((to_process + processed) < nbytes) + NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE; + else + NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE; - rc = nx_build_sg_lists(nx_ctx, &desc, req->dst, req->src, nbytes, 0, - csbcpb->cpb.aes_gcm.iv_or_cnt); - if (rc) - goto out; + csbcpb->cpb.aes_gcm.bit_length_data = nbytes * 8; + desc.tfm = (struct crypto_blkcipher *) req->base.tfm; + rc = nx_build_sg_lists(nx_ctx, &desc, req->dst, + req->src, to_process, processed, + csbcpb->cpb.aes_gcm.iv_or_cnt); + if (rc) + goto out; - rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, - req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP); - if (rc) - goto out; + rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, + req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP); + if (rc) + goto out; + + memcpy(desc.info, csbcpb->cpb.aes_gcm.out_cnt, AES_BLOCK_SIZE); + memcpy(csbcpb->cpb.aes_gcm.in_pat_or_aad, + csbcpb->cpb.aes_gcm.out_pat_or_mac, AES_BLOCK_SIZE); + memcpy(csbcpb->cpb.aes_gcm.in_s0, + csbcpb->cpb.aes_gcm.out_s0, AES_BLOCK_SIZE); + + NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION; + + atomic_inc(&(nx_ctx->stats->aes_ops)); + atomic64_add(csbcpb->csb.processed_byte_count, + &(nx_ctx->stats->aes_bytes)); - atomic_inc(&(nx_ctx->stats->aes_ops)); - atomic64_add(csbcpb->csb.processed_byte_count, - &(nx_ctx->stats->aes_bytes)); + processed += to_process; + } while (processed < nbytes); if (enc) { /* copy out the auth tag */ |