4 files changed, 14 insertions, 1 deletions
diff --git a/net/dcsctp/public/dcsctp_socket.h b/net/dcsctp/public/dcsctp_socket.h
index f340cd9ca0..1c2fb97f7a 100644
--- a/net/dcsctp/public/dcsctp_socket.h
+++ b/net/dcsctp/public/dcsctp_socket.h
@@ -296,6 +296,9 @@ class DcSctpSocketInterface {
   // The options it was created with.
   virtual const DcSctpOptions& options() const = 0;
 
+  // Update the options max_message_size.
+  virtual void SetMaxMessageSize(size_t max_message_size) = 0;
+
   // Sends the message `message` using the provided send options.
   // Sending a message is an asynchrous operation, and the `OnError` callback
   // may be invoked to indicate any errors in sending the message.
diff --git a/net/dcsctp/socket/dcsctp_socket.cc b/net/dcsctp/socket/dcsctp_socket.cc
index b54ad80b9c..dd54317718 100644
--- a/net/dcsctp/socket/dcsctp_socket.cc
+++ b/net/dcsctp/socket/dcsctp_socket.cc
@@ -424,6 +424,10 @@ SocketState DcSctpSocket::state() const {
   }
 }
 
+void DcSctpSocket::SetMaxMessageSize(size_t max_message_size) {
+  options_.max_message_size = max_message_size;
+}
+
 void DcSctpSocket::MaybeSendShutdownOnPacketReceived(const SctpPacket& packet) {
   if (state_ == State::kShutdownSent) {
     bool has_data_chunk =
diff --git a/net/dcsctp/socket/dcsctp_socket.h b/net/dcsctp/socket/dcsctp_socket.h
index 271e82e42e..24c0437b41 100644
--- a/net/dcsctp/socket/dcsctp_socket.h
+++ b/net/dcsctp/socket/dcsctp_socket.h
@@ -92,6 +92,7 @@ class DcSctpSocket : public DcSctpSocketInterface {
       rtc::ArrayView<const StreamID> outgoing_streams) override;
   SocketState state() const override;
   const DcSctpOptions& options() const override { return options_; }
+  void SetMaxMessageSize(size_t max_message_size) override;
 
   // Returns this socket's verification tag, or zero if not yet connected.
   VerificationTag verification_tag() const {
@@ -244,7 +245,7 @@ class DcSctpSocket : public DcSctpSocketInterface {
 
   const std::string log_prefix_;
   const std::unique_ptr<PacketObserver> packet_observer_;
-  const DcSctpOptions options_;
+  DcSctpOptions options_;
 
   // Enqueues callbacks and dispatches them just before returning to the caller.
   CallbackDeferrer callbacks_;
diff --git a/net/dcsctp/socket/dcsctp_socket_test.cc b/net/dcsctp/socket/dcsctp_socket_test.cc
index 1848448587..c542a9cd1a 100644
--- a/net/dcsctp/socket/dcsctp_socket_test.cc
+++ b/net/dcsctp/socket/dcsctp_socket_test.cc
@@ -1085,5 +1085,10 @@ TEST_F(DcSctpSocketTest, PassingHighWatermarkWillOnlyAcceptCumAckTsn) {
                             .Build());
 }
 
+TEST_F(DcSctpSocketTest, SetMaxMessageSize) {
+  sock_a_.SetMaxMessageSize(42u);
+  EXPECT_EQ(sock_a_.options().max_message_size, 42u);
+}
+
 }  // namespace
 }  // namespace dcsctp