60 lines
1.1 KiB
C
60 lines
1.1 KiB
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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struct {
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__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
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__uint(max_entries, 5);
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__uint(key_size, sizeof(__u32));
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__uint(value_size, sizeof(__u32));
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} jmp_table SEC(".maps");
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SEC("classifier/0")
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int bpf_func_0(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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SEC("classifier/1")
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int bpf_func_1(struct __sk_buff *skb)
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{
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bpf_tail_call_static(skb, &jmp_table, 2);
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return 1;
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}
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SEC("classifier/2")
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int bpf_func_2(struct __sk_buff *skb)
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{
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return 2;
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}
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SEC("classifier/3")
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int bpf_func_3(struct __sk_buff *skb)
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{
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bpf_tail_call_static(skb, &jmp_table, 4);
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return 3;
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}
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SEC("classifier/4")
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int bpf_func_4(struct __sk_buff *skb)
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{
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bpf_tail_call_static(skb, &jmp_table, 3);
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return 4;
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}
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SEC("classifier")
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int entry(struct __sk_buff *skb)
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{
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bpf_tail_call_static(skb, &jmp_table, 0);
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/* Check multi-prog update. */
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bpf_tail_call_static(skb, &jmp_table, 2);
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/* Check tail call limit. */
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bpf_tail_call_static(skb, &jmp_table, 3);
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return 3;
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}
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char __license[] SEC("license") = "GPL";
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int _version SEC("version") = 1;
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