tls: rx: only copy IV from the packet for TLS 1.2

TLS 1.3 and ChaChaPoly don't carry IV in the packet.
The code before this change would copy out iv_size
worth of whatever followed the TLS header in the packet
and then for TLS 1.3 | ChaCha overwrite that with
the sequence number. Waste of cycles especially
with TLS 1.2 being close to dead and TLS 1.3 being
the common case.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tls/tls_sw.c

@@ -1482,6 +1482,11 @@ static int decrypt_internal(struct sock *sk, struct sk_buff *skb,
 	}
 
 	/* Prepare IV */
+	if (prot->version == TLS_1_3_VERSION ||
+	    prot->cipher_type == TLS_CIPHER_CHACHA20_POLY1305) {
+		memcpy(iv + iv_offset, tls_ctx->rx.iv,
+		       prot->iv_size + prot->salt_size);
+	} else {
 		err = skb_copy_bits(skb, rxm->offset + TLS_HEADER_SIZE,
 				    iv + iv_offset + prot->salt_size,
 				    prot->iv_size);
@@ -1489,13 +1494,8 @@ static int decrypt_internal(struct sock *sk, struct sk_buff *skb,
 			kfree(mem);
 			return err;
 		}
-	if (prot->version == TLS_1_3_VERSION ||
-	    prot->cipher_type == TLS_CIPHER_CHACHA20_POLY1305)
-		memcpy(iv + iv_offset, tls_ctx->rx.iv,
-		       prot->iv_size + prot->salt_size);
-	else
 		memcpy(iv + iv_offset, tls_ctx->rx.iv, prot->salt_size);
-
+	}
 	xor_iv_with_seq(prot, iv + iv_offset, tls_ctx->rx.rec_seq);
 
 	/* Prepare AAD */