__be16 tp_dst; /* TCP/UDP destination port. */
__u8 dl_src[ETH_ALEN]; /* Ethernet source address. */
__u8 dl_dst[ETH_ALEN]; /* Ethernet destination address. */
- __u8 nw_proto; /* IP protocol. */
+ __u8 nw_proto; /* IP protocol or lower 8 bits of
+ ARP opcode. */
__u8 reserved; /* Pad to 64 bits. */
};