I succeeded to add options to ipfw rules such as rtp protocol.
my changes is in below files in /usr/src/ :
sys/netpfil/ip_fw2.c
sys/netinet/ip_fw.h declare O_UDP_RTP
sbin/ipfw/ipfw2.c & .h

then build &  install kernel and makeinstall ipfw in path: "/sbin/ipfw/ "



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