TPACKET_ALIGN 129 include/uapi/linux/if_packet.h #define TPACKET_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket_hdr)) + sizeof(struct sockaddr_ll)) TPACKET_ALIGN 234 include/uapi/linux/if_packet.h #define TPACKET2_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket2_hdr)) + sizeof(struct sockaddr_ll)) TPACKET_ALIGN 235 include/uapi/linux/if_packet.h #define TPACKET3_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket3_hdr)) + sizeof(struct sockaddr_ll))