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 __failure __msg("invalid indirect read from stack")
tc_uninit_mtu(struct __sk_buff * ctx)10 int tc_uninit_mtu(struct __sk_buff *ctx)
11 {
12 	__u32 mtu;
13 
14 	bpf_check_mtu(ctx, 0, &mtu, 0, 0);
15 	return TCX_PASS;
16 }
17 
18 char LICENSE[] SEC("license") = "GPL";
19