Add support for kTLS

Reference: https://gitlab.com/go-extension/tls

common/ktls/ktls_const.go

@@ -0,0 +1,24 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build linux && go1.25 && !without_badtls
+
+package ktls
+
+const (
+	maxPlaintext               = 16384        // maximum plaintext payload length
+	maxCiphertext              = 16384 + 2048 // maximum ciphertext payload length
+	maxCiphertextTLS13         = 16384 + 256  // maximum ciphertext length in TLS 1.3
+	recordHeaderLen            = 5            // record header length
+	maxHandshake               = 65536        // maximum handshake we support (protocol max is 16 MB)
+	maxHandshakeCertificateMsg = 262144       // maximum certificate message size (256 KiB)
+	maxUselessRecords          = 16           // maximum number of consecutive non-advancing records
+)
+
+const (
+	recordTypeChangeCipherSpec = 20
+	recordTypeAlert            = 21
+	recordTypeHandshake        = 22
+	recordTypeApplicationData  = 23
+)