net/quic/quic_address_mismatch.cc

   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