40 lines
603 B
C
40 lines
603 B
C
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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__noinline
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long changes_pkt_data(struct __sk_buff *sk)
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{
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return bpf_skb_pull_data(sk, 0);
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}
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__noinline __weak
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long does_not_change_pkt_data(struct __sk_buff *sk)
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{
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return 0;
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}
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SEC("?tc")
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int main_with_subprogs(struct __sk_buff *sk)
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{
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changes_pkt_data(sk);
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does_not_change_pkt_data(sk);
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return 0;
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}
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SEC("?tc")
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int main_changes(struct __sk_buff *sk)
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{
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bpf_skb_pull_data(sk, 0);
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return 0;
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}
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SEC("?tc")
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int main_does_not_change(struct __sk_buff *sk)
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{
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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