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