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diff --git a/third_party/libwebrtc/net/dcsctp/common/math.h b/third_party/libwebrtc/net/dcsctp/common/math.h
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+++ b/third_party/libwebrtc/net/dcsctp/common/math.h
@@ -0,0 +1,36 @@
+/*
+ *  Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#ifndef NET_DCSCTP_COMMON_MATH_H_
+#define NET_DCSCTP_COMMON_MATH_H_
+
+namespace dcsctp {
+
+// Rounds up `val` to the nearest value that is divisible by four. Frequently
+// used to e.g. pad chunks or parameters to an even 32-bit offset.
+template <typename IntType>
+IntType RoundUpTo4(IntType val) {
+  return (val + 3) & ~3;
+}
+
+// Similarly, rounds down `val` to the nearest value that is divisible by four.
+template <typename IntType>
+IntType RoundDownTo4(IntType val) {
+  return val & ~3;
+}
+
+// Returns true if `val` is divisible by four.
+template <typename IntType>
+bool IsDivisibleBy4(IntType val) {
+  return (val & 3) == 0;
+}
+
+}  // namespace dcsctp
+
+#endif  // NET_DCSCTP_COMMON_MATH_H_