-__PF(802_3,802_3)
-__PF(AX25,ax25)
-__PF(ALL,all)
-__PF(802_2,802_2)
-__PF(SNAP,snap)
-__PF(DDCMP,ddcmp)
-__PF(WAN_PPP,wan_ppp)
-__PF(PPP_MP,ppp_mp)
-__PF(LOCALTALK,localtalk)
-__PF(PPPTALK,ppptalk)
-__PF(TR_802_2,tr_802_2)
-__PF(MOBITEX,mobitex)
-__PF(CONTROL,control)
-__PF(IRDA,irda)