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

   1// SPDX-License-Identifier: GPL-2.0
   2/* fails to load without expected_attach_type = BPF_XDP_DEVMAP
   3 * because of access to egress_ifindex
   4 */
   5#include <linux/bpf.h>
   6#include <bpf/bpf_helpers.h>
   7
   8SEC("xdp_dm_log")
   9int xdpdm_devlog(struct xdp_md *ctx)
  10{
  11        char fmt[] = "devmap redirect: dev %u -> dev %u len %u\n";
  12        void *data_end = (void *)(long)ctx->data_end;
  13        void *data = (void *)(long)ctx->data;
  14        unsigned int len = data_end - data;
  15
  16        bpf_trace_printk(fmt, sizeof(fmt),
  17                         ctx->ingress_ifindex, ctx->egress_ifindex, len);
  18
  19        return XDP_PASS;
  20}
  21
  22char _license[] SEC("license") = "GPL";
  23