Following is the C code to add a new header to NS2 for MANET routing. You are required to discuss each statement and function used in this code and its purpose.

structhdr_emur_pkt {

nsaddr_tpkt_src_;

u_int16_t pkt_len_;

u_int8_t pkt_seq_num_;

inlinensaddr_t&pkt_src() { return pkt_src_; }

inline u_int16_t&pkt_len() { return pkt_len_; }

inline u_int8_t&pkt_seq_num() { return pkt_seq_num_; }

staticint offset_;

inline static int& offset() { return offset_; }

inline static hdr_emur_pkt* access(const Packet* p) {

return (hdr_emur_pkt*)p->access(offset_);

}

};

#define HDR_EMUR_PKT(p) hdr_emur_pkt::access(p)