| 1 | // SPDX-License-Identifier: GPL-2.0 |
|---|---|
| 2 | #include <linux/bpf.h> |
| 3 | #include <bpf/bpf_helpers.h> |
| 4 | |
| 5 | SEC("xdp") |
| 6 | int 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 | |
| 20 | char _license[] SEC("license") = "GPL"; |
| 21 |