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"; 21