Subject: [PATCH 41/45] net/tls: reject offload of TLS 1.3

From: Jakub Kicinski <[email-masked]>
Date: Fri, 28 Jun 2019 16:07:59 -0700

[ Upstream commit 618bac45937a3dc6126ac0652747481e97000f99 ]

Neither drivers nor the tls offload code currently supports TLS
version 1.3. Check the TLS version when installing connection
state. TLS 1.3 will just fallback to the kernel crypto for now.

Fixes: 130b392c6cd6 ("net: tls: Add tls 1.3 support")
Signed-off-by: Jakub Kicinski <[email-masked]>
Reviewed-by: Dirk van der Merwe <[email-masked]>
Signed-off-by: David S. Miller <[email-masked]>
---
 net/tls/tls_device.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c
index f6e258e37611..fdcf18c78bb5 100644
--- a/net/tls/tls_device.c
+++ b/net/tls/tls_device.c
@@ -746,6 +746,11 @@ int tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
 	}
 
 	crypto_info = &ctx->crypto_send.info;
+	if (crypto_info->version != TLS_1_2_VERSION) {
+		rc = -EOPNOTSUPP;
+		goto free_offload_ctx;
+	}
+
 	switch (crypto_info->cipher_type) {
 	case TLS_CIPHER_AES_GCM_128:
 		nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
@@ -880,6 +885,9 @@ int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx)
 	struct net_device *netdev;
 	int rc = 0;
 
+	if (ctx->crypto_recv.info.version != TLS_1_2_VERSION)
+		return -EOPNOTSUPP;
+
 	/* We support starting offload on multiple sockets
 	 * concurrently, so we only need a read lock here.
 	 * This lock must precede get_netdev_for_sock to prevent races between
-- 
2.20.1