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

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include "vmlinux.h"
   4 #include <bpf/bpf_helpers.h>
   5 #include "bpf_misc.h"
   6
   7 SEC("tc/ingress")
   8 __description("uninit/mtu: write rejected")
   9 __success
  10 __caps_unpriv(CAP_BPF|CAP_NET_ADMIN)
  11 __failure_unpriv __msg_unpriv("invalid indirect read from stack")
  12 int tc_uninit_mtu(struct __sk_buff *ctx)
  13 {
  14         __u32 mtu;
  15
  16         bpf_check_mtu(ctx, 0, &mtu, 0, 0);
  17         return TCX_PASS;
  18 }
  19
  20 char LICENSE[] SEC("license") = "GPL";