25 lines
593 B
C
25 lines
593 B
C
// 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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#include "xdpsock.h"
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/* This XDP program is only needed for the XDP_SHARED_UMEM mode.
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* If you do not use this mode, libbpf can supply an XDP program for you.
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*/
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struct {
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__uint(type, BPF_MAP_TYPE_XSKMAP);
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__uint(max_entries, MAX_SOCKS);
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__uint(key_size, sizeof(int));
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__uint(value_size, sizeof(int));
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} xsks_map SEC(".maps");
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static unsigned int rr;
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SEC("xdp_sock") int xdp_sock_prog(struct xdp_md *ctx)
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{
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rr = (rr + 1) & (MAX_SOCKS - 1);
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return bpf_redirect_map(&xsks_map, rr, XDP_DROP);
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}
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