LXR linux/tools/testing/selftests/bpf/progs/test_xdp_context_test

   1// SPDX-License-Identifier: GPL-2.0
   2#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