Update from https://crrev.com/304418

net/base/net_util_linux.cc

+// Copyright (c) 2014 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/base/net_util_linux.h"
+
+#include <net/if.h>
+#include <netinet/in.h>
+#include <set>
+#include <sys/types.h>
+
+#include "base/files/file_path.h"
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_tokenizer.h"
+#include "base/strings/string_util.h"
+#include "base/threading/thread_restrictions.h"
+#include "net/base/address_tracker_linux.h"
+#include "net/base/escape.h"
+#include "net/base/ip_endpoint.h"
+#include "net/base/net_errors.h"
+#include "net/base/net_util_posix.h"
+#include "url/gurl.h"
+
+namespace net {
+
+namespace {
+
+// When returning true, the platform native IPv6 address attributes were
+// successfully converted to net IP address attributes. Otherwise, returning
+// false and the caller should drop the IP address which can't be used by the
+// application layer.
+bool TryConvertNativeToNetIPAttributes(int native_attributes,
+                                       int* net_attributes) {
+  // For Linux/ChromeOS/Android, we disallow addresses with attributes
+  // IFA_F_OPTIMISTIC, IFA_F_DADFAILED, and IFA_F_TENTATIVE as these
+  // are still progressing through duplicated address detection (DAD)
+  // and shouldn't be used by the application layer until DAD process
+  // is completed.
+  if (native_attributes & (
+#if !defined(OS_ANDROID)
+                              IFA_F_OPTIMISTIC | IFA_F_DADFAILED |
+#endif  // !OS_ANDROID
+                              IFA_F_TENTATIVE)) {
+    return false;
+  }
+
+  if (native_attributes & IFA_F_TEMPORARY) {
+    *net_attributes |= IP_ADDRESS_ATTRIBUTE_TEMPORARY;
+  }
+
+  if (native_attributes & IFA_F_DEPRECATED) {
+    *net_attributes |= IP_ADDRESS_ATTRIBUTE_DEPRECATED;
+  }
+
+  return true;
+}
+
+}  // namespace
+
+namespace internal {
+
+inline const unsigned char* GetIPAddressData(const IPAddressNumber& ip) {
+#if defined(OS_ANDROID)
+  return ip.begin();
+#else
+  return ip.data();
+#endif
+}
+
+bool GetNetworkListImpl(
+    NetworkInterfaceList* networks,
+    int policy,
+    const base::hash_set<int>& online_links,
+    const internal::AddressTrackerLinux::AddressMap& address_map,
+    GetInterfaceNameFunction get_interface_name) {
+  std::map<int, std::string> ifnames;
+
+  for (internal::AddressTrackerLinux::AddressMap::const_iterator it =
+           address_map.begin();
+       it != address_map.end(); ++it) {
+    // Ignore addresses whose links are not online.
+    if (online_links.find(it->second.ifa_index) == online_links.end())
+      continue;
+
+    sockaddr_storage sock_addr;
+    socklen_t sock_len = sizeof(sockaddr_storage);
+
+    // Convert to sockaddr for next check.
+    if (!IPEndPoint(it->first, 0)
+             .ToSockAddr(reinterpret_cast<sockaddr*>(&sock_addr), &sock_len)) {
+      continue;
+    }
+
+    // Skip unspecified addresses (i.e. made of zeroes) and loopback addresses
+    if (IsLoopbackOrUnspecifiedAddress(reinterpret_cast<sockaddr*>(&sock_addr)))
+      continue;
+
+    int ip_attributes = IP_ADDRESS_ATTRIBUTE_NONE;
+
+    if (it->second.ifa_family == AF_INET6) {
+      // Ignore addresses whose attributes are not actionable by
+      // the application layer.
+      if (!TryConvertNativeToNetIPAttributes(it->second.ifa_flags,
+                                             &ip_attributes))
+        continue;
+    }
+
+    // Find the name of this link.
+    std::map<int, std::string>::const_iterator itname =
+        ifnames.find(it->second.ifa_index);
+    std::string ifname;
+    if (itname == ifnames.end()) {
+      char buffer[IF_NAMESIZE] = {0};
+      if (get_interface_name(it->second.ifa_index, buffer)) {
+        ifname = ifnames[it->second.ifa_index] = buffer;
+      } else {
+        // Ignore addresses whose interface name can't be retrieved.
+        continue;
+      }
+    } else {
+      ifname = itname->second;
+    }
+
+    // Based on the interface name and policy, determine whether we
+    // should ignore it.
+    if (ShouldIgnoreInterface(ifname, policy))
+      continue;
+
+    networks->push_back(
+        NetworkInterface(ifname, ifname, it->second.ifa_index,
+                         NetworkChangeNotifier::CONNECTION_UNKNOWN, it->first,
+                         it->second.ifa_prefixlen, ip_attributes));
+  }
+
+  return true;
+}
+
+}  // namespace internal
+
+bool GetNetworkList(NetworkInterfaceList* networks, int policy) {
+  if (networks == NULL)
+    return false;
+
+  internal::AddressTrackerLinux tracker;
+  tracker.Init();
+
+  return internal::GetNetworkListImpl(networks, policy,
+                                      tracker.GetOnlineLinks(),
+                                      tracker.GetAddressMap(), &if_indextoname);
+}
+
+}  // namespace net