// SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2022 Intel */ #include <linux/bpf.h> #include <bpf/bpf_helpers.h> struct { __uint(type, BPF_MAP_TYPE_XSKMAP); __uint(max_entries, 1); __uint(key_size, sizeof(int)); __uint(value_size, sizeof(int)); } xsk SEC(".maps"); static unsigned int idx; SEC("xdp") int xsk_def_prog(struct xdp_md *xdp) { return bpf_redirect_map(&xsk, 0, XDP_DROP); } SEC("xdp") int xsk_xdp_drop(struct xdp_md *xdp) { /* Drop every other packet */ if (idx++ % 2) return XDP_DROP; return bpf_redirect_map(&xsk, 0, XDP_DROP); } char _license[] SEC("license") = "GPL";