netdev - [PATCH net-next 1/7] net: tls: Save iv in tls

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Message-ID: <20190124172146.q4acuud6z35wevm4@davejwatson-mba.dhcp.thefacebook.com>
Date:   Thu, 24 Jan 2019 17:20:12 +0000
From:   Dave Watson <davejwatson@...com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Dave Miller <davem@...emloft.net>
CC:     Vakul Garg <vakul.garg@....com>,
        Boris Pismenny <borisp@...lanox.com>,
        Aviad Yehezkel <aviadye@...lanox.com>,
        John Fastabend <john.fastabend@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: [PATCH net-next 1/7] net: tls: Save iv in tls_rec for async crypto
 requests

aead_request_set_crypt takes an iv pointer, and we change the iv
soon after setting it.  Some async crypto algorithms don't save the iv,
so we need to save it in the tls_rec for async requests.

Found by hardcoding x64 aesni to use async crypto manager (to test the async
codepath), however I don't think this combination can happen in the wild.
Presumably other hardware offloads will need this fix, but there have been
no user reports.

Fixes: a42055e8d2c30 ("Add support for async encryption of records...")
Signed-off-by: Dave Watson <davejwatson@...com>
---
 include/net/tls.h | 2 ++
 net/tls/tls_sw.c  | 4 +++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/net/tls.h b/include/net/tls.h
index 90bf52db573e..4592606e136a 100644
--- a/include/net/tls.h
+++ b/include/net/tls.h
@@ -120,6 +120,8 @@ struct tls_rec {
 	struct scatterlist sg_aead_out[2];
 
 	char aad_space[TLS_AAD_SPACE_SIZE];
+	u8 iv_data[TLS_CIPHER_AES_GCM_128_IV_SIZE +
+		   TLS_CIPHER_AES_GCM_128_SALT_SIZE];
 	struct aead_request aead_req;
 	u8 aead_req_ctx[];
 };
diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index 86b9527c4826..0382a4674bb3 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -447,6 +447,8 @@ static int tls_do_encryption(struct sock *sk,
 	struct scatterlist *sge = sk_msg_elem(msg_en, start);
 	int rc;
 
+	memcpy(rec->iv_data, tls_ctx->tx.iv, sizeof(rec->iv_data));
+
 	sge->offset += tls_ctx->tx.prepend_size;
 	sge->length -= tls_ctx->tx.prepend_size;
 
@@ -456,7 +458,7 @@ static int tls_do_encryption(struct sock *sk,
 	aead_request_set_ad(aead_req, TLS_AAD_SPACE_SIZE);
 	aead_request_set_crypt(aead_req, rec->sg_aead_in,
 			       rec->sg_aead_out,
-			       data_len, tls_ctx->tx.iv);
+			       data_len, rec->iv_data);
 
 	aead_request_set_callback(aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG,
 				  tls_encrypt_done, sk);
-- 
2.17.1