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- // SPDX-License-Identifier: GPL-2.0
- #include <linux/bpf.h>
- #include <bpf/bpf_helpers.h>
- #include "xdpsock.h"
- /* This XDP program is only needed for the XDP_SHARED_UMEM mode.
- * If you do not use this mode, libbpf can supply an XDP program for you.
- */
- struct {
- __uint(type, BPF_MAP_TYPE_XSKMAP);
- __uint(max_entries, MAX_SOCKS);
- __uint(key_size, sizeof(int));
- __uint(value_size, sizeof(int));
- } xsks_map SEC(".maps");
- static unsigned int rr;
- SEC("xdp_sock") int xdp_sock_prog(struct xdp_md *ctx)
- {
- rr = (rr + 1) & (MAX_SOCKS - 1);
- return bpf_redirect_map(&xsks_map, rr, XDP_DROP);
- }
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