Added NetworkInterface::network_prefix

net/base/net_util_posix.cc

Index: net/base/net_util_posix.cc
diff --git a/net/base/net_util_posix.cc b/net/base/net_util_posix.cc
index 904d8028bc26e22d76bc05bda11705838d010326..6bd64c01404a7766abfcacc1928ab1f359ff1bbe 100644
--- a/net/base/net_util_posix.cc
+++ b/net/base/net_util_posix.cc
@@ -133,10 +133,19 @@ bool GetNetworkList(NetworkInterfaceList* networks) {
       // Skip non-IP addresses.
       continue;
     }
+
     IPEndPoint address;
     std::string name = interface->ifa_name;
     if (address.FromSockAddr(addr, addr_size)) {
-      networks->push_back(NetworkInterface(name, address.address()));
+      uint8 net_mask = 0;
+      if (interface->ifa_netmask) {
+        IPEndPoint netmask;
+        if (netmask.FromSockAddr(interface->ifa_netmask, addr_size)) {
+          net_mask = MaskPrefixLength(netmask.address());
+        }
+      }
+
+      networks->push_back(NetworkInterface(name, address.address(), net_mask));
     }
   }