| // 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); |
| } |
