tls: also use init_prot_info in tls_set_device_offload

Most values are shared. Nonce size turns out to be equal to IV size
for all offloadable ciphers.
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tls/tls.h

@@ -142,6 +142,10 @@ void update_sk_prot(struct sock *sk, struct tls_context *ctx);
 int wait_on_pending_writer(struct sock *sk, long *timeo);
 void tls_err_abort(struct sock *sk, int err);
 
+int init_prot_info(struct tls_prot_info *prot,
+		   const struct tls_crypto_info *crypto_info,
+		   const struct tls_cipher_desc *cipher_desc,
+		   int mode);
 int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx);
 void tls_update_rx_zc_capable(struct tls_context *tls_ctx);
 void tls_sw_strparser_arm(struct sock *sk, struct tls_context *ctx);

net/tls/tls_device.c

@@ -1076,20 +1076,14 @@ int tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
 		goto release_netdev;
 	}
 
+	rc = init_prot_info(prot, crypto_info, cipher_desc, TLS_HW);
+	if (rc)
+		goto release_netdev;
+
 	iv = crypto_info_iv(crypto_info, cipher_desc);
 	rec_seq = crypto_info_rec_seq(crypto_info, cipher_desc);
 
-	prot->version = crypto_info->version;
-	prot->cipher_type = crypto_info->cipher_type;
-	prot->prepend_size = TLS_HEADER_SIZE + cipher_desc->iv;
-	prot->tag_size = cipher_desc->tag;
-	prot->overhead_size = prot->prepend_size + prot->tag_size;
-	prot->iv_size = cipher_desc->iv;
-	prot->salt_size = cipher_desc->salt;
-
 	memcpy(ctx->tx.iv + cipher_desc->salt, iv, cipher_desc->iv);
-
-	prot->rec_seq_size = cipher_desc->rec_seq;
 	memcpy(ctx->tx.rec_seq, rec_seq, cipher_desc->rec_seq);
 
 	start_marker_record = kmalloc(sizeof(*start_marker_record), GFP_KERNEL);

net/tls/tls_sw.c

@@ -2620,9 +2620,10 @@ static struct tls_sw_context_rx *init_ctx_rx(struct tls_context *ctx)
 	return sw_ctx_rx;
 }
 
-static int init_prot_info(struct tls_prot_info *prot,
-			  const struct tls_crypto_info *crypto_info,
-			  const struct tls_cipher_desc *cipher_desc)
+int init_prot_info(struct tls_prot_info *prot,
+		   const struct tls_crypto_info *crypto_info,
+		   const struct tls_cipher_desc *cipher_desc,
+		   int mode)
 {
 	u16 nonce_size = cipher_desc->nonce;
 
@@ -2635,6 +2636,11 @@ static int init_prot_info(struct tls_prot_info *prot,
 		prot->tail_size = 0;
 	}
 
+	if (mode == TLS_HW) {
+		prot->aad_size = 0;
+		prot->tail_size = 0;
+	}
+
 	/* Sanity-check the sizes for stack allocations. */
 	if (nonce_size > TLS_MAX_IV_SIZE || prot->aad_size > TLS_MAX_AAD_SIZE)
 		return -EINVAL;
@@ -2696,7 +2702,7 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
 		goto free_priv;
 	}
 
-	rc = init_prot_info(prot, crypto_info, cipher_desc);
+	rc = init_prot_info(prot, crypto_info, cipher_desc, TLS_SW);
 	if (rc)
 		goto free_priv;