commit 812d615717c3dc05e78c369051a89f40e260d259
author Eric Newberry <enewberry@cs.arizona.edu> Wed Jun 06 15:06:01 2018 -0700
committer Eric Newberry <enewberry@cs.arizona.edu> Tue Jun 19 16:28:29 2018 -0700
tree ef6205409867e9dffca9922cb64dd5bd5a82e644
parent e4b2238b33c05d491257ea418498b4c5fcca2268

mgmt+face: allow MTU of datagram faces to be overridden

refs #4005

Change-Id: I01d98b88cdee41b633f6fb9a5600088efe8de749

daemon/face/unicast-udp-transport.cpp

diff --git a/daemon/face/unicast-udp-transport.cpp b/daemon/face/unicast-udp-transport.cpp
index 8e3d7d8..062c924 100644
--- a/daemon/face/unicast-udp-transport.cpp
+++ b/daemon/face/unicast-udp-transport.cpp
@@ -40,7 +40,8 @@
 
 UnicastUdpTransport::UnicastUdpTransport(protocol::socket&& socket,
                                          ndn::nfd::FacePersistency persistency,
-                                         time::nanoseconds idleTimeout)
+                                         time::nanoseconds idleTimeout,
+                                         optional<ssize_t> overrideMtu)
   : DatagramTransport(std::move(socket))
   , m_idleTimeout(idleTimeout)
 {
@@ -49,7 +50,14 @@
   this->setScope(ndn::nfd::FACE_SCOPE_NON_LOCAL);
   this->setPersistency(persistency);
   this->setLinkType(ndn::nfd::LINK_TYPE_POINT_TO_POINT);
-  this->setMtu(udp::computeMtu(m_socket.local_endpoint()));
+
+  if (overrideMtu) {
+    this->setMtu(std::min(udp::computeMtu(m_socket.local_endpoint()), *overrideMtu));
+  }
+  else {
+    this->setMtu(udp::computeMtu(m_socket.local_endpoint()));
+  }
+  BOOST_ASSERT(this->getMtu() >= MIN_MTU);
 
   NFD_LOG_FACE_INFO("Creating transport");