taglinefilesource code
ar_pln1973drivers/net/arcnet.cif (arp->ar_hln==1 && arp->ar_pln==4)
ar_pln1993drivers/net/arcnet.carp->ar_hln,arp->ar_pln);
ar_pln76include/linux/if_arp.hunsigned char  ar_pln;    /* length of protocol address  */
ar_pln383net/ipv4/arp.carp->ar_pln = 4;
ar_pln615net/ipv4/arp.carp->ar_pln != 4)
ar_pln237net/ipv4/rarp.c|| rarp->ar_pln != 4)