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Try different combinations of global functions replacement: - replace function that changes packet data with one that doesn't; - replace function that changes packet data with one that does; - replace function that doesn't change packet data with one that does; - replace function that doesn't change packet data with one that doesn't; Signed-off-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/r/20241210041100.1898468-7-eddyz87@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
27 lines
452 B
C
27 lines
452 B
C
// 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, __u32 len)
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{
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return bpf_skb_pull_data(sk, len);
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}
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__noinline __weak
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long does_not_change_pkt_data(struct __sk_buff *sk, __u32 len)
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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 dummy(struct __sk_buff *sk)
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{
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changes_pkt_data(sk, 0);
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does_not_change_pkt_data(sk, 0);
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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