// SPDX-License-Identifier: GPL-2.0 #include <linux/bpf.h> #include <bpf/bpf_helpers.h> #include "xdpsock.h" /* This XDP program is only needed for the XDP_SHARED_UMEM mode. * If you do not use this mode, libbpf can supply an XDP program for you. */ struct { __uint(type, BPF_MAP_TYPE_XSKMAP); __uint(max_entries, MAX_SOCKS); __uint(key_size, sizeof(int)); __uint(value_size, sizeof(int)); } xsks_map SEC(".maps"); static unsigned int rr; SEC("xdp_sock") int xdp_sock_prog(struct xdp_md *ctx) { rr = (rr + 1) & (MAX_SOCKS - 1); return bpf_redirect_map(&xsks_map, rr, XDP_DROP); }