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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "net/quic/quic_address_mismatch.h"
      6 
      7 #include "base/logging.h"
      8 #include "net/base/ip_endpoint.h"
      9 
     10 namespace net {
     11 
     12 int GetAddressMismatch(const IPEndPoint& first_address,
     13                        const IPEndPoint& second_address) {
     14   if (first_address.address().empty() || second_address.address().empty()) {
     15     return -1;
     16   }
     17   IPAddressNumber first_ip_address = first_address.address();
     18   if (IsIPv4Mapped(first_ip_address)) {
     19     first_ip_address = ConvertIPv4MappedToIPv4(first_ip_address);
     20   }
     21   IPAddressNumber second_ip_address = second_address.address();
     22   if (IsIPv4Mapped(second_ip_address)) {
     23     second_ip_address = ConvertIPv4MappedToIPv4(second_ip_address);
     24   }
     25 
     26   int sample;
     27   if (first_ip_address != second_ip_address) {
     28     sample = QUIC_ADDRESS_MISMATCH_BASE;
     29   } else if (first_address.port() != second_address.port()) {
     30     sample = QUIC_PORT_MISMATCH_BASE;
     31   } else {
     32     sample = QUIC_ADDRESS_AND_PORT_MATCH_BASE;
     33   }
     34 
     35   // Add an offset to |sample|:
     36   //   V4_V4: add 0
     37   //   V6_V6: add 1
     38   //   V4_V6: add 2
     39   //   V6_V4: add 3
     40   bool first_ipv4 = (first_ip_address.size() == kIPv4AddressSize);
     41   bool second_ipv4 = (second_ip_address.size() == kIPv4AddressSize);
     42   if (first_ipv4 != second_ipv4) {
     43     CHECK_EQ(sample, QUIC_ADDRESS_MISMATCH_BASE);
     44     sample += 2;
     45   }
     46   if (!first_ipv4) {
     47     sample += 1;
     48   }
     49   return sample;
     50 }
     51 
     52 }  // namespace net
     53