Deprecate gfe2_reloadable_flag_quic_blocked_ports

PiperOrigin-RevId: 412119269

quic/core/quic_dispatcher.cc

diff --git a/quic/core/quic_dispatcher.cc b/quic/core/quic_dispatcher.cc
index a1e89b2..4221d4f 100644
--- a/quic/core/quic_dispatcher.cc
+++ b/quic/core/quic_dispatcher.cc
@@ -495,13 +495,7 @@
 }
 
 namespace {
-inline bool IsSourceUdpPortBlocked(uint16_t port) {
-  // TODO(dschinazi) make this function constexpr when we remove flag
-  // protection.
-  if (!GetQuicReloadableFlag(quic_blocked_ports)) {
-    return port == 0;
-  }
-  QUIC_RELOADABLE_FLAG_COUNT(quic_blocked_ports);
+constexpr bool IsSourceUdpPortBlocked(uint16_t port) {
   // These UDP source ports have been observed in large scale denial of service
   // attacks and are not expected to ever carry user traffic, they are therefore
   // blocked as a safety measure. See draft-ietf-quic-applicability for details.

quic/core/quic_dispatcher_test.cc

diff --git a/quic/core/quic_dispatcher_test.cc b/quic/core/quic_dispatcher_test.cc
index 199270e..ca4ae48 100644
--- a/quic/core/quic_dispatcher_test.cc
+++ b/quic/core/quic_dispatcher_test.cc
@@ -1216,7 +1216,6 @@
 }
 
 TEST_P(QuicDispatcherTestAllVersions, ProcessPacketWithBlockedPort) {
-  SetQuicReloadableFlag(quic_blocked_ports, true);
   CreateTimeWaitListManager();
 
   QuicSocketAddress client_address(QuicIpAddress::Loopback4(), 17);

quic/core/quic_flags_list.h

diff --git a/quic/core/quic_flags_list.h b/quic/core/quic_flags_list.h
index 9942173..1726182 100644
--- a/quic/core/quic_flags_list.h
+++ b/quic/core/quic_flags_list.h
@@ -127,8 +127,6 @@
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_ignore_user_agent_transport_parameter, true)
 // When true, QUIC will both send and validate the version_information transport parameter.
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_version_information, false)
-// When true, QuicDispatcher will silently drop incoming packets whose UDP source port is on the blocklist.
-QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_blocked_ports, true)
 // When true, defaults to BBR congestion control instead of Cubic.
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_default_to_bbr, false)
 // When true, prevents QUIC\'s PacingSender from generating bursts when the congestion controller is CWND limited and not pacing limited.