18c2ecf20Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0 28c2ecf20Sopenharmony_ci#include <linux/bpf.h> 38c2ecf20Sopenharmony_ci#include <bpf/bpf_helpers.h> 48c2ecf20Sopenharmony_ci#include "bpf_legacy.h" 58c2ecf20Sopenharmony_ci 68c2ecf20Sopenharmony_cistruct { 78c2ecf20Sopenharmony_ci __uint(type, BPF_MAP_TYPE_PROG_ARRAY); 88c2ecf20Sopenharmony_ci __uint(max_entries, 1); 98c2ecf20Sopenharmony_ci __uint(key_size, sizeof(__u32)); 108c2ecf20Sopenharmony_ci __uint(value_size, sizeof(__u32)); 118c2ecf20Sopenharmony_ci} jmp_table SEC(".maps"); 128c2ecf20Sopenharmony_ci 138c2ecf20Sopenharmony_cistatic __noinline 148c2ecf20Sopenharmony_ciint subprog_tail(struct __sk_buff *skb) 158c2ecf20Sopenharmony_ci{ 168c2ecf20Sopenharmony_ci if (load_byte(skb, 0)) 178c2ecf20Sopenharmony_ci bpf_tail_call_static(skb, &jmp_table, 1); 188c2ecf20Sopenharmony_ci else 198c2ecf20Sopenharmony_ci bpf_tail_call_static(skb, &jmp_table, 0); 208c2ecf20Sopenharmony_ci return 1; 218c2ecf20Sopenharmony_ci} 228c2ecf20Sopenharmony_ci 238c2ecf20Sopenharmony_cistatic volatile int count; 248c2ecf20Sopenharmony_ci 258c2ecf20Sopenharmony_ciSEC("classifier/0") 268c2ecf20Sopenharmony_ciint bpf_func_0(struct __sk_buff *skb) 278c2ecf20Sopenharmony_ci{ 288c2ecf20Sopenharmony_ci count++; 298c2ecf20Sopenharmony_ci return subprog_tail(skb); 308c2ecf20Sopenharmony_ci} 318c2ecf20Sopenharmony_ci 328c2ecf20Sopenharmony_ciSEC("classifier") 338c2ecf20Sopenharmony_ciint entry(struct __sk_buff *skb) 348c2ecf20Sopenharmony_ci{ 358c2ecf20Sopenharmony_ci bpf_tail_call_static(skb, &jmp_table, 0); 368c2ecf20Sopenharmony_ci 378c2ecf20Sopenharmony_ci return 0; 388c2ecf20Sopenharmony_ci} 398c2ecf20Sopenharmony_ci 408c2ecf20Sopenharmony_cichar __license[] SEC("license") = "GPL"; 418c2ecf20Sopenharmony_ciint _version SEC("version") = 1; 42