tools/testing/selftests/bpf/progs/test_xdp_devmap_helpers.c

   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
   8 SEC("xdp_dm_log")
   9 int 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
  22 char _license[] SEC("license") = "GPL";