1 // SPDX-License-Identifier: GPL-2.0 2 3 #include <linux/bpf.h> 4 #include <bpf/bpf_helpers.h> 5 6 SEC("?freplace") changes_pkt_data(struct __sk_buff * sk)7long changes_pkt_data(struct __sk_buff *sk) 8 { 9 return bpf_skb_pull_data(sk, 0); 10 } 11 12 SEC("?freplace") does_not_change_pkt_data(struct __sk_buff * sk)13long does_not_change_pkt_data(struct __sk_buff *sk) 14 { 15 return 0; 16 } 17 18 char _license[] SEC("license") = "GPL"; 19