| // 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/dummy_cm") |
| int xdp_dummy_cm(struct xdp_md *ctx) |
| { |
| if (ctx->ingress_ifindex == IFINDEX_LO) |
| return XDP_DROP; |
| |
| return XDP_PASS; |
| } |
| |
| char _license[] SEC("license") = "GPL"; |
