18c2ecf20Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0 28c2ecf20Sopenharmony_ci#include <linux/bpf.h> 38c2ecf20Sopenharmony_ci 48c2ecf20Sopenharmony_ci#include <bpf/bpf_helpers.h> 58c2ecf20Sopenharmony_ci 68c2ecf20Sopenharmony_cistruct { 78c2ecf20Sopenharmony_ci __uint(type, BPF_MAP_TYPE_PROG_ARRAY); 88c2ecf20Sopenharmony_ci __uint(max_entries, 3); 98c2ecf20Sopenharmony_ci __uint(key_size, sizeof(__u32)); 108c2ecf20Sopenharmony_ci __uint(value_size, sizeof(__u32)); 118c2ecf20Sopenharmony_ci} jmp_table SEC(".maps"); 128c2ecf20Sopenharmony_ci 138c2ecf20Sopenharmony_ci#define TAIL_FUNC(x) \ 148c2ecf20Sopenharmony_ci SEC("classifier/" #x) \ 158c2ecf20Sopenharmony_ci int bpf_func_##x(struct __sk_buff *skb) \ 168c2ecf20Sopenharmony_ci { \ 178c2ecf20Sopenharmony_ci return x; \ 188c2ecf20Sopenharmony_ci } 198c2ecf20Sopenharmony_ciTAIL_FUNC(0) 208c2ecf20Sopenharmony_ciTAIL_FUNC(1) 218c2ecf20Sopenharmony_ciTAIL_FUNC(2) 228c2ecf20Sopenharmony_ci 238c2ecf20Sopenharmony_ciSEC("classifier") 248c2ecf20Sopenharmony_ciint entry(struct __sk_buff *skb) 258c2ecf20Sopenharmony_ci{ 268c2ecf20Sopenharmony_ci /* Multiple locations to make sure we patch 278c2ecf20Sopenharmony_ci * all of them. 288c2ecf20Sopenharmony_ci */ 298c2ecf20Sopenharmony_ci bpf_tail_call_static(skb, &jmp_table, 0); 308c2ecf20Sopenharmony_ci bpf_tail_call_static(skb, &jmp_table, 0); 318c2ecf20Sopenharmony_ci bpf_tail_call_static(skb, &jmp_table, 0); 328c2ecf20Sopenharmony_ci bpf_tail_call_static(skb, &jmp_table, 0); 338c2ecf20Sopenharmony_ci 348c2ecf20Sopenharmony_ci bpf_tail_call_static(skb, &jmp_table, 1); 358c2ecf20Sopenharmony_ci bpf_tail_call_static(skb, &jmp_table, 1); 368c2ecf20Sopenharmony_ci bpf_tail_call_static(skb, &jmp_table, 1); 378c2ecf20Sopenharmony_ci bpf_tail_call_static(skb, &jmp_table, 1); 388c2ecf20Sopenharmony_ci 398c2ecf20Sopenharmony_ci bpf_tail_call_static(skb, &jmp_table, 2); 408c2ecf20Sopenharmony_ci bpf_tail_call_static(skb, &jmp_table, 2); 418c2ecf20Sopenharmony_ci bpf_tail_call_static(skb, &jmp_table, 2); 428c2ecf20Sopenharmony_ci bpf_tail_call_static(skb, &jmp_table, 2); 438c2ecf20Sopenharmony_ci 448c2ecf20Sopenharmony_ci return 3; 458c2ecf20Sopenharmony_ci} 468c2ecf20Sopenharmony_ci 478c2ecf20Sopenharmony_cichar __license[] SEC("license") = "GPL"; 488c2ecf20Sopenharmony_ciint _version SEC("version") = 1; 49