Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #include <linux/bpf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #include <bpf/bpf_helpers.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) #include "xdpsock.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) /* This XDP program is only needed for the XDP_SHARED_UMEM mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * If you do not use this mode, libbpf can supply an XDP program for you.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 	__uint(type, BPF_MAP_TYPE_XSKMAP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 	__uint(max_entries, MAX_SOCKS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 	__uint(key_size, sizeof(int));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 	__uint(value_size, sizeof(int));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) } xsks_map SEC(".maps");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) static unsigned int rr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) SEC("xdp_sock") int xdp_sock_prog(struct xdp_md *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	rr = (rr + 1) & (MAX_SOCKS - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	return bpf_redirect_map(&xsks_map, rr, XDP_DROP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) }