Drop Packets with the multipath bit set before decryption. Protected by FLAGS_quic_reloadable_flag_…

net/quic/core/quic_framer_test.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/core/quic_framer.h"
 
 #include <algorithm>
 #include <cstdint>
 #include <map>
 #include <memory>
@@ skipping 897 matching lines @@
   EXPECT_EQ(kConnectionId, visitor_.header_->public_header.connection_id);
   EXPECT_EQ(PACKET_1BYTE_PACKET_NUMBER,
             visitor_.header_->public_header.packet_number_length);
   EXPECT_EQ(kPacketNumber - 1, visitor_.header_->packet_number);
 }
 
 TEST_P(QuicFramerTest, PacketWithDiversificationNonce) {
   // clang-format off
   unsigned char packet[] = {
     // public flags: includes nonce flag
-    0x7C,
+    static_cast<unsigned char>(
+        FLAGS_quic_reloadable_flag_quic_remove_multipath_bit ? 0x3C : 0x7C),
     // connection_id
     0x10, 0x32, 0x54, 0x76, 0x98, 0xBA, 0xDC, 0xFE,
     // nonce
     0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
     0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
     0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
     0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
     // packet number
     0xBC, 0x9A, 0x78, 0x56, 0x34, 0x12,
 
     // frame type (padding)
     0x00,
     0x00, 0x00, 0x00, 0x00
   };
   // clang-format on
 
   QuicEncryptedPacket encrypted(AsChars(packet), arraysize(packet), false);
   QuicFramerPeer::SetPerspective(&framer_, Perspective::IS_CLIENT);
   EXPECT_TRUE(framer_.ProcessPacket(encrypted));
   ASSERT_TRUE(visitor_.public_header_->nonce != nullptr);
   for (char i = 0; i < 32; ++i) {
     EXPECT_EQ(i, (*visitor_.public_header_->nonce)[static_cast<size_t>(i)]);
   }
 };
 
 TEST_P(QuicFramerTest, LargePublicFlagWithMismatchedVersions) {
   // clang-format off
   unsigned char packet[] = {
     // public flags (8 byte connection_id, version flag and an unknown flag)
-    0x79,
+    static_cast<unsigned char>(
+        FLAGS_quic_reloadable_flag_quic_remove_multipath_bit ? 0x39 : 0x79),
     // connection_id
     0x10, 0x32, 0x54, 0x76,
     0x98, 0xBA, 0xDC, 0xFE,
     // version tag
     'Q', '0', '0', '0',
     // packet number
     0xBC, 0x9A, 0x78, 0x56,
     0x34, 0x12,
 
     // frame type (padding frame)
@@ skipping 2699 matching lines @@
     'o',  ' ',  'w',  'o',
     'r',  'l',  'd',  '!',
   };
   // clang-format on
 
   QuicFramerFuzzFunc(packet, arraysize(packet));
 }
 
 }  // namespace test
 }  // namespace net