New files:

Modified files:
samples/bpf/xdp_fwd_user.c
samples/bpf/xdp_router_ipv4_user.c
samples/bpf/xdp_tx_iptunnel_user.c
samples/bpf/xdp_adjust_tail_user.c
include/uapi/linux/libc-compat.h
include/uapi/linux/socket.h
include/linux/socket.h
samples/bpf/xdp_sample_user.c
include/uapi/linux/if.h