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 "net/base/ip_endpoint.h"
   8
   9 namespace net {
  10
  11 int GetAddressMismatch(const IPEndPoint& first_address,
  12                        const IPEndPoint& second_address) {
  13   if (first_address.address().empty() || second_address.address().empty()) {
  14     return -1;
  15   }
  16
  17   int sample;
  18   if (first_address.address() != second_address.address()) {
  19     sample = QUIC_ADDRESS_MISMATCH_BASE;
  20   } else if (first_address.port() != second_address.port()) {
  21     sample = QUIC_PORT_MISMATCH_BASE;
  22   } else {
  23     sample = QUIC_ADDRESS_AND_PORT_MATCH_BASE;
  24   }
  25
  26   // Add an offset to |sample|:
  27   //   V4_V4: add 0
  28   //   V6_V6: add 1
  29   //   V4_V6: add 2
  30   //   V6_V4: add 3
  31   bool first_ipv4 = (first_address.address().size() == kIPv4AddressSize);
  32   bool second_ipv4 = (second_address.address().size() == kIPv4AddressSize);
  33   if (first_ipv4 != second_ipv4) {
  34     CHECK_EQ(sample, QUIC_ADDRESS_MISMATCH_BASE);
  35     sample += 2;
  36   }
  37   if (!first_ipv4) {
  38     sample += 1;
  39   }
  40   return sample;
  41 }
  42
  43 }  // namespace net