// SPDX-License-Identifier: GPL-2.0 #include "vmlinux.h" #include <bpf/bpf_helpers.h> #include <bpf/bpf_tracing.h> SEC("xdp") int xdp_devmap(struct xdp_md *ctx) { return ctx->egress_ifindex; } struct { __uint(type, BPF_MAP_TYPE_PROG_ARRAY); __uint(max_entries, 1); __uint(key_size, sizeof(__u32)); __array(values, int (void *)); } xdp_map SEC(".maps") = { .values = { [0] = (void *)&xdp_devmap, }, }; SEC("xdp") int xdp_entry(struct xdp_md *ctx) { bpf_tail_call(ctx, &xdp_map, 0); return 0; }