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_cistatic volatile int selector; 148c2ecf20Sopenharmony_ci 158c2ecf20Sopenharmony_ci#define TAIL_FUNC(x) \ 168c2ecf20Sopenharmony_ci SEC("classifier/" #x) \ 178c2ecf20Sopenharmony_ci int bpf_func_##x(struct __sk_buff *skb) \ 188c2ecf20Sopenharmony_ci { \ 198c2ecf20Sopenharmony_ci return x; \ 208c2ecf20Sopenharmony_ci } 218c2ecf20Sopenharmony_ciTAIL_FUNC(0) 228c2ecf20Sopenharmony_ciTAIL_FUNC(1) 238c2ecf20Sopenharmony_ciTAIL_FUNC(2) 248c2ecf20Sopenharmony_ci 258c2ecf20Sopenharmony_ciSEC("classifier") 268c2ecf20Sopenharmony_ciint entry(struct __sk_buff *skb) 278c2ecf20Sopenharmony_ci{ 288c2ecf20Sopenharmony_ci int idx = 0; 298c2ecf20Sopenharmony_ci 308c2ecf20Sopenharmony_ci if (selector == 1234) 318c2ecf20Sopenharmony_ci idx = 1; 328c2ecf20Sopenharmony_ci else if (selector == 5678) 338c2ecf20Sopenharmony_ci idx = 2; 348c2ecf20Sopenharmony_ci 358c2ecf20Sopenharmony_ci bpf_tail_call(skb, &jmp_table, idx); 368c2ecf20Sopenharmony_ci return 3; 378c2ecf20Sopenharmony_ci} 388c2ecf20Sopenharmony_ci 398c2ecf20Sopenharmony_cichar __license[] SEC("license") = "GPL"; 408c2ecf20Sopenharmony_ciint _version SEC("version") = 1; 41