ipv4_packet_key
typedef ipv4_packet_key KeyType;
const ipv4_packet_key& packetKey = value->Key();
FragmentPacket::FragmentPacket(const ipv4_packet_key& key)
struct ipv4_packet_key key;
FragmentPacket(const ipv4_packet_key& key);
const ipv4_packet_key& Key() const { return fKey; }
struct ipv4_packet_key fKey;