pkt_find_edns_opt
if(!pkt_find_edns_opt(&walk_q, &walk_qlen))
if(!pkt_find_edns_opt(&walk_p, &walk_plen))
if(!pkt_find_edns_opt(&walk_q, &walk_qlen)) {
if(!pkt_find_edns_opt(&walk_p, &walk_plen)) {
return pkt_find_edns_opt(&pkt, &len);
if(!pkt_find_edns_opt(&walk, &walk_len)) {
if(!pkt_find_edns_opt(&opt_position, &remaining)) return 0;