1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2019 Facebook */ 3 #include <linux/bpf.h> 4 #include "bpf_helpers.h" 5 #include "bpf_trace_helpers.h" 6 7 struct sk_buff { 8 unsigned int len; 9 }; 10 11 __u64 test_result = 0; 12 BPF_TRACE_2("fexit/test_pkt_md_access", test_main2, 13 struct sk_buff *, skb, int, ret) 14 { 15 int len; 16 17 __builtin_preserve_access_index(({ 18 len = skb->len; 19 })); 20 if (len != 74 || ret != 0) 21 return 0; 22 23 test_result = 1; 24 return 0; 25 } 26 char _license[] SEC("license") = "GPL"; 27