179d49ba0SDaniel Borkmann // SPDX-License-Identifier: GPL-2.0
279d49ba0SDaniel Borkmann #include <linux/bpf.h>
379d49ba0SDaniel Borkmann
43e689141SToke Høiland-Jørgensen #include <bpf/bpf_helpers.h>
579d49ba0SDaniel Borkmann
679d49ba0SDaniel Borkmann struct {
779d49ba0SDaniel Borkmann __uint(type, BPF_MAP_TYPE_PROG_ARRAY);
879d49ba0SDaniel Borkmann __uint(max_entries, 3);
979d49ba0SDaniel Borkmann __uint(key_size, sizeof(__u32));
1079d49ba0SDaniel Borkmann __uint(value_size, sizeof(__u32));
1179d49ba0SDaniel Borkmann } jmp_table SEC(".maps");
1279d49ba0SDaniel Borkmann
1379d49ba0SDaniel Borkmann #define TAIL_FUNC(x) \
14*c22bdd28SAndrii Nakryiko SEC("tc") \
15*c22bdd28SAndrii Nakryiko int classifier_##x(struct __sk_buff *skb) \
1679d49ba0SDaniel Borkmann { \
1779d49ba0SDaniel Borkmann return x; \
1879d49ba0SDaniel Borkmann }
1979d49ba0SDaniel Borkmann TAIL_FUNC(0)
2079d49ba0SDaniel Borkmann TAIL_FUNC(1)
2179d49ba0SDaniel Borkmann TAIL_FUNC(2)
2279d49ba0SDaniel Borkmann
23*c22bdd28SAndrii Nakryiko SEC("tc")
entry(struct __sk_buff * skb)2479d49ba0SDaniel Borkmann int entry(struct __sk_buff *skb)
2579d49ba0SDaniel Borkmann {
2679d49ba0SDaniel Borkmann /* Multiple locations to make sure we patch
2779d49ba0SDaniel Borkmann * all of them.
2879d49ba0SDaniel Borkmann */
29faef26faSDaniel Borkmann bpf_tail_call_static(skb, &jmp_table, 0);
30faef26faSDaniel Borkmann bpf_tail_call_static(skb, &jmp_table, 0);
31faef26faSDaniel Borkmann bpf_tail_call_static(skb, &jmp_table, 0);
32faef26faSDaniel Borkmann bpf_tail_call_static(skb, &jmp_table, 0);
3379d49ba0SDaniel Borkmann
34faef26faSDaniel Borkmann bpf_tail_call_static(skb, &jmp_table, 1);
35faef26faSDaniel Borkmann bpf_tail_call_static(skb, &jmp_table, 1);
36faef26faSDaniel Borkmann bpf_tail_call_static(skb, &jmp_table, 1);
37faef26faSDaniel Borkmann bpf_tail_call_static(skb, &jmp_table, 1);
3879d49ba0SDaniel Borkmann
39faef26faSDaniel Borkmann bpf_tail_call_static(skb, &jmp_table, 2);
40faef26faSDaniel Borkmann bpf_tail_call_static(skb, &jmp_table, 2);
41faef26faSDaniel Borkmann bpf_tail_call_static(skb, &jmp_table, 2);
42faef26faSDaniel Borkmann bpf_tail_call_static(skb, &jmp_table, 2);
4379d49ba0SDaniel Borkmann
4479d49ba0SDaniel Borkmann return 3;
4579d49ba0SDaniel Borkmann }
4679d49ba0SDaniel Borkmann
4779d49ba0SDaniel Borkmann char __license[] SEC("license") = "GPL";
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