// 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); | |
} |