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// 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_redir")
int xdp_redir_prog(struct xdp_md *ctx)
{
return bpf_redirect_map(&cpu_map, 1, 0);
}
SEC("xdp_dummy")
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";
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