On client address changes, only migrate QUIC connections when client address changes are considered…

net/quic/quic_connection.cc

Index: net/quic/quic_connection.cc
diff --git a/net/quic/quic_connection.cc b/net/quic/quic_connection.cc
index 2fa5a12de1b49ffdbd666926733e48f1e33a221f..d465bd45dce23ec3c4d481a3532f11b184fe70a8 100644
--- a/net/quic/quic_connection.cc
+++ b/net/quic/quic_connection.cc
@@ -1343,6 +1343,15 @@ bool QuicConnection::ProcessValidatedPacket() {
   }
 
   if (peer_ip_changed_ || peer_port_changed_) {
+    PeerAddressChangeType type = DeterminePeerAddressChangeType();
+    if (type != NO_CHANGE && type != UNKNOWN &&
+        (FLAGS_quic_disable_non_nat_address_migration &&
+         type != NAT_PORT_REBINDING && type != IPV4_SUBNET_REBINDING)) {
+      SendConnectionCloseWithDetails(QUIC_ERROR_MIGRATING_ADDRESS,
+                                     "Invalid peer address migration.");
+      return false;
+    }
+
     IPEndPoint old_peer_address = peer_address_;
     peer_address_ = IPEndPoint(
         peer_ip_changed_ ? migrating_peer_ip_ : peer_address_.address(),
@@ -1741,6 +1750,10 @@ void QuicConnection::SendOrQueuePacket(QueuedPacket packet) {
   }
 }
 
+PeerAddressChangeType QuicConnection::DeterminePeerAddressChangeType() {
+  return UNKNOWN;
+}
+
 void QuicConnection::SendPing() {
   if (retransmission_alarm_->IsSet()) {
     return;