en/html/udp__hdr_8h_source.html

 #ifndef UDP_HDR_H

 #define UDP_HDR_H


 struct sniff_udp {

         u_short th_sport;               /* source port */

         u_short th_dport;               /* destination port */

         u_short th_len ;

         u_short th_sum;                 /* checksum */

 };

 #endif // UDP_HDR_H

sniff_udp
The sniff_tcp struct contains the UDP header. We use the first two members to extract the src and dst...
Definition: udp_hdr.h:8