71 lines
1.1 KiB
C
71 lines
1.1 KiB
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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#include "bpf_misc.h"
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int classifier_0(struct __sk_buff *skb);
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int classifier_1(struct __sk_buff *skb);
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struct {
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__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
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__uint(max_entries, 2);
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__uint(key_size, sizeof(__u32));
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__array(values, void (void));
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} jmp_table SEC(".maps") = {
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.values = {
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[0] = (void *) &classifier_0,
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[1] = (void *) &classifier_1,
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},
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};
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int count0 = 0;
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int count1 = 0;
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static __noinline
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int subprog_tail0(struct __sk_buff *skb)
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{
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bpf_tail_call_static(skb, &jmp_table, 0);
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return 0;
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}
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__auxiliary
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SEC("tc")
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int classifier_0(struct __sk_buff *skb)
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{
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count0++;
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subprog_tail0(skb);
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return 0;
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}
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static __noinline
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int subprog_tail1(struct __sk_buff *skb)
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{
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bpf_tail_call_static(skb, &jmp_table, 1);
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return 0;
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}
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__auxiliary
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SEC("tc")
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int classifier_1(struct __sk_buff *skb)
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{
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count1++;
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subprog_tail1(skb);
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return 0;
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}
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__success
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__retval(33)
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SEC("tc")
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int tailcall_bpf2bpf_hierarchy_2(struct __sk_buff *skb)
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{
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int ret = 0;
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subprog_tail0(skb);
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subprog_tail1(skb);
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__sink(ret);
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return (count1 << 16) | count0;
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}
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char __license[] SEC("license") = "GPL";
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