[dpdk-stable] [PATCH] examples/l2fwd-crypto: fix verify with decrypt in chain

[Yuanhan Liu]

Applied to dpdk stable branch 16.07

Thanks.

	--yliu


On Fri, Nov 18, 2016 at 03:55:24PM +0100, Piotr Azarewicz wrote:
> backported from upstream commit 893fbab03186 ("examples/l2fwd-crypto:
> fix verify with decrypt in chain")
> 
> This patch fixes crypto operation data parameters setting
> in l2fwd-crypto application, making decryption in chain
> with auth verification work.
> 
> How to reproduce the issue:
> 
> 1. Run l2fwd_crypto with command:
> -c 0x3 -n 4 --vdev "crypto_aesni_mb" \
> --vdev "crypto_aesni_mb" \
> -- -p 0x3 --chain CIPHER_HASH \
> --cipher_op ENCRYPT --cipher_algo AES_CBC \
> --cipher_key 00:01:02:03:04:05:06:07:08:09:0a:0b:0c:0d:0e:0f \
> --iv 00:01:02:03:04:05:06:07:08:09:0a:0b:0c:0d:0e:ff \
> --auth_op GENERATE --auth_algo SHA1_HMAC \
> --auth_key
> 11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:
> 11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:
> 11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11
> 
> 2. Send packet with payload and capture forwarded packet.
> Payload in forwarded packet is encrypted, what is good.
> 
> 3. Run l2fwd_crypto with command:
> -c 0x3 -n 4 --vdev "crypto_aesni_mb" \
> --vdev "crypto_aesni_mb" \
> -- -p 0x3 --chain HASH_CIPHER \
> --cipher_op DECRYPT --cipher_algo AES_CBC \
> --cipher_key 00:01:02:03:04:05:06:07:08:09:0a:0b:0c:0d:0e:0f \
> --iv 00:01:02:03:04:05:06:07:08:09:0a:0b:0c:0d:0e:ff \
> --auth_op VERIFY --auth_algo SHA1_HMAC \
> --auth_key
> 11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:
> 11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:
> 11:11:11:11:11:11:11:11:11:11:11:11:11:11:11:11
> 
> 4. Send earlier captured packet and capture forwarded packet.
> Payload in newly captured packet is not decrypted, what is wrong.
> 
> Fixes: 387259bd6c67 ("examples/l2fwd-crypto: add sample application")
> 
> Signed-off-by: Piotr Azarewicz <piotrx.t.azarewicz at intel.com>
> Acked-by: Michal Jastrzebski <michalx.k.jastrzebski at intel.com>
> ---
>  examples/l2fwd-crypto/main.c |   23 ++++++++---------------
>  1 file changed, 8 insertions(+), 15 deletions(-)
> 
> diff --git a/examples/l2fwd-crypto/main.c b/examples/l2fwd-crypto/main.c
> index 66397a0..6cfa916 100644
> --- a/examples/l2fwd-crypto/main.c
> +++ b/examples/l2fwd-crypto/main.c
> @@ -441,6 +441,10 @@ l2fwd_simple_crypto_enqueue(struct rte_mbuf *m,
>  
>  	/* Zero pad data to be crypto'd so it is block aligned */
>  	data_len  = rte_pktmbuf_data_len(m) - ipdata_offset;
> +
> +	if (cparams->do_hash && cparams->hash_verify)
> +		data_len -= cparams->digest_length;
> +
>  	pad_len = data_len % cparams->block_size ? cparams->block_size -
>  			(data_len % cparams->block_size) : 0;
>  
> @@ -462,8 +466,8 @@ l2fwd_simple_crypto_enqueue(struct rte_mbuf *m,
>  			op->sym->auth.digest.data = (uint8_t *)rte_pktmbuf_append(m,
>  				cparams->digest_length);
>  		} else {
> -			op->sym->auth.digest.data = (uint8_t *)rte_pktmbuf_append(m,
> -				cparams->digest_length);
> +			op->sym->auth.digest.data = rte_pktmbuf_mtod(m,
> +				uint8_t *) + ipdata_offset + data_len;
>  		}
>  
>  		op->sym->auth.digest.phys_addr = rte_pktmbuf_mtophys_offset(m,
> @@ -496,21 +500,10 @@ l2fwd_simple_crypto_enqueue(struct rte_mbuf *m,
>  		if (cparams->cipher_algo == RTE_CRYPTO_CIPHER_SNOW3G_UEA2 ||
>  				cparams->cipher_algo == RTE_CRYPTO_CIPHER_KASUMI_F8) {
>  			op->sym->cipher.data.offset = ipdata_offset << 3;
> -			if (cparams->do_hash && cparams->hash_verify)
> -				/* Do not cipher the hash tag */
> -				op->sym->cipher.data.length = (data_len -
> -					cparams->digest_length) << 3;
> -			else
> -				op->sym->cipher.data.length = data_len << 3;
> -
> +			op->sym->cipher.data.length = data_len << 3;
>  		} else {
>  			op->sym->cipher.data.offset = ipdata_offset;
> -			if (cparams->do_hash && cparams->hash_verify)
> -				/* Do not cipher the hash tag */
> -				op->sym->cipher.data.length = data_len -
> -					cparams->digest_length;
> -			else
> -				op->sym->cipher.data.length = data_len;
> +			op->sym->cipher.data.length = data_len;
>  		}
>  	}
>  
> -- 
> 1.7.9.5