31 lines
607 B
C
31 lines
607 B
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2022 Intel */
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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struct {
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__uint(type, BPF_MAP_TYPE_XSKMAP);
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__uint(max_entries, 1);
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__uint(key_size, sizeof(int));
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__uint(value_size, sizeof(int));
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} xsk SEC(".maps");
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static unsigned int idx;
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SEC("xdp") int xsk_def_prog(struct xdp_md *xdp)
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{
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return bpf_redirect_map(&xsk, 0, XDP_DROP);
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}
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SEC("xdp") int xsk_xdp_drop(struct xdp_md *xdp)
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{
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/* Drop every other packet */
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if (idx++ % 2)
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return XDP_DROP;
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return bpf_redirect_map(&xsk, 0, XDP_DROP);
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}
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char _license[] SEC("license") = "GPL";
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