21 lines · c
1// SPDX-License-Identifier: GPL-2.02#include <linux/bpf.h>3#include <bpf/bpf_helpers.h>4 5SEC("xdp")6int xdp_context(struct xdp_md *xdp)7{8 void *data = (void *)(long)xdp->data;9 __u32 *metadata = (void *)(long)xdp->data_meta;10 __u32 ret;11 12 if (metadata + 1 > data)13 return XDP_ABORTED;14 ret = *metadata;15 if (bpf_xdp_adjust_meta(xdp, 4))16 return XDP_ABORTED;17 return ret;18}19 20char _license[] SEC("license") = "GPL";21