// 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");

__u32 redirect_count = 0;

SEC("xdp")
int xdp_redir_prog(struct xdp_md *ctx)
{
        return bpf_redirect_map(&cpu_map, 0, 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 (bpf_get_smp_processor_id() == 0)
                redirect_count++;

        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";