// SPDX-License-Identifier: GPL-2.0 #include <linux/bpf.h> #include <bpf/bpf_helpers.h> #define IFINDEX_LO 1 struct { __uint(type, BPF_MAP_TYPE_CPUMAP); __uint(key_size, sizeof(__u32)); __uint(value_size, sizeof(struct bpf_cpumap_val)); __uint(max_entries, 4); } cpu_map SEC(".maps"); SEC("xdp") int xdp_redir_prog(struct xdp_md *ctx) { return bpf_redirect_map(&cpu_map, 1, 0); } SEC("xdp") int xdp_dummy_prog(struct xdp_md *ctx) { return XDP_PASS; } SEC("xdp/cpumap") int xdp_dummy_cm(struct xdp_md *ctx) { if (ctx->ingress_ifindex == IFINDEX_LO) return XDP_DROP; return XDP_PASS; } SEC("xdp.frags/cpumap") int xdp_dummy_cm_frags(struct xdp_md *ctx) { return XDP_PASS; } char _license[] SEC("license") = "GPL";