18c2ecf20Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0 28c2ecf20Sopenharmony_ci#include <linux/bpf.h> 38c2ecf20Sopenharmony_ci#include <bpf/bpf_helpers.h> 48c2ecf20Sopenharmony_ci#include "xdpsock.h" 58c2ecf20Sopenharmony_ci 68c2ecf20Sopenharmony_ci/* This XDP program is only needed for the XDP_SHARED_UMEM mode. 78c2ecf20Sopenharmony_ci * If you do not use this mode, libbpf can supply an XDP program for you. 88c2ecf20Sopenharmony_ci */ 98c2ecf20Sopenharmony_ci 108c2ecf20Sopenharmony_cistruct { 118c2ecf20Sopenharmony_ci __uint(type, BPF_MAP_TYPE_XSKMAP); 128c2ecf20Sopenharmony_ci __uint(max_entries, MAX_SOCKS); 138c2ecf20Sopenharmony_ci __uint(key_size, sizeof(int)); 148c2ecf20Sopenharmony_ci __uint(value_size, sizeof(int)); 158c2ecf20Sopenharmony_ci} xsks_map SEC(".maps"); 168c2ecf20Sopenharmony_ci 178c2ecf20Sopenharmony_cistatic unsigned int rr; 188c2ecf20Sopenharmony_ci 198c2ecf20Sopenharmony_ciSEC("xdp_sock") int xdp_sock_prog(struct xdp_md *ctx) 208c2ecf20Sopenharmony_ci{ 218c2ecf20Sopenharmony_ci rr = (rr + 1) & (MAX_SOCKS - 1); 228c2ecf20Sopenharmony_ci 238c2ecf20Sopenharmony_ci return bpf_redirect_map(&xsks_map, rr, XDP_DROP); 248c2ecf20Sopenharmony_ci} 25