taglinefilesource code
PACKET_HOST421net/core/skbuff.cskb->pkt_type = PACKET_HOST;  /* Default type */
PACKET_HOST121net/ipv4/icmp.cif(skb_in->pkt_type!=PACKET_HOST)
PACKET_HOST1650net/ipv4/ip.cif(skb->pkt_type!=PACKET_HOST || brd==IS_BROADCAST)
PACKET_HOST4479net/ipv4/tcp.cif(skb->pkt_type!=PACKET_HOST)