179d49ba0SDaniel Borkmann // SPDX-License-Identifier: GPL-2.0
279d49ba0SDaniel Borkmann #include <linux/bpf.h>
379d49ba0SDaniel Borkmann 
479d49ba0SDaniel Borkmann #include "bpf_helpers.h"
579d49ba0SDaniel Borkmann 
679d49ba0SDaniel Borkmann struct {
779d49ba0SDaniel Borkmann 	__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
879d49ba0SDaniel Borkmann 	__uint(max_entries, 5);
979d49ba0SDaniel Borkmann 	__uint(key_size, sizeof(__u32));
1079d49ba0SDaniel Borkmann 	__uint(value_size, sizeof(__u32));
1179d49ba0SDaniel Borkmann } jmp_table SEC(".maps");
1279d49ba0SDaniel Borkmann 
1379d49ba0SDaniel Borkmann SEC("classifier/0")
1479d49ba0SDaniel Borkmann int bpf_func_0(struct __sk_buff *skb)
1579d49ba0SDaniel Borkmann {
1679d49ba0SDaniel Borkmann 	bpf_tail_call(skb, &jmp_table, 1);
1779d49ba0SDaniel Borkmann 	return 0;
1879d49ba0SDaniel Borkmann }
1979d49ba0SDaniel Borkmann 
2079d49ba0SDaniel Borkmann SEC("classifier/1")
2179d49ba0SDaniel Borkmann int bpf_func_1(struct __sk_buff *skb)
2279d49ba0SDaniel Borkmann {
2379d49ba0SDaniel Borkmann 	bpf_tail_call(skb, &jmp_table, 2);
2479d49ba0SDaniel Borkmann 	return 1;
2579d49ba0SDaniel Borkmann }
2679d49ba0SDaniel Borkmann 
2779d49ba0SDaniel Borkmann SEC("classifier/2")
2879d49ba0SDaniel Borkmann int bpf_func_2(struct __sk_buff *skb)
2979d49ba0SDaniel Borkmann {
3079d49ba0SDaniel Borkmann 	return 2;
3179d49ba0SDaniel Borkmann }
3279d49ba0SDaniel Borkmann 
3379d49ba0SDaniel Borkmann SEC("classifier/3")
3479d49ba0SDaniel Borkmann int bpf_func_3(struct __sk_buff *skb)
3579d49ba0SDaniel Borkmann {
3679d49ba0SDaniel Borkmann 	bpf_tail_call(skb, &jmp_table, 4);
3779d49ba0SDaniel Borkmann 	return 3;
3879d49ba0SDaniel Borkmann }
3979d49ba0SDaniel Borkmann 
4079d49ba0SDaniel Borkmann SEC("classifier/4")
4179d49ba0SDaniel Borkmann int bpf_func_4(struct __sk_buff *skb)
4279d49ba0SDaniel Borkmann {
4379d49ba0SDaniel Borkmann 	bpf_tail_call(skb, &jmp_table, 3);
4479d49ba0SDaniel Borkmann 	return 4;
4579d49ba0SDaniel Borkmann }
4679d49ba0SDaniel Borkmann 
4779d49ba0SDaniel Borkmann SEC("classifier")
4879d49ba0SDaniel Borkmann int entry(struct __sk_buff *skb)
4979d49ba0SDaniel Borkmann {
5079d49ba0SDaniel Borkmann 	bpf_tail_call(skb, &jmp_table, 0);
5179d49ba0SDaniel Borkmann 	/* Check multi-prog update. */
5279d49ba0SDaniel Borkmann 	bpf_tail_call(skb, &jmp_table, 2);
5379d49ba0SDaniel Borkmann 	/* Check tail call limit. */
5479d49ba0SDaniel Borkmann 	bpf_tail_call(skb, &jmp_table, 3);
5579d49ba0SDaniel Borkmann 	return 3;
5679d49ba0SDaniel Borkmann }
5779d49ba0SDaniel Borkmann 
5879d49ba0SDaniel Borkmann char __license[] SEC("license") = "GPL";
5979d49ba0SDaniel Borkmann int _version SEC("version") = 1;
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