1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/bpf.h> 3 4 #include <bpf/bpf_helpers.h> 5 6 struct { 7 __uint(type, BPF_MAP_TYPE_PROG_ARRAY); 8 __uint(max_entries, 1); 9 __uint(key_size, sizeof(__u32)); 10 __uint(value_size, sizeof(__u32)); 11 } jmp_table SEC(".maps"); 12 13 int count, which; 14 15 SEC("tc") 16 int classifier_0(struct __sk_buff *skb) 17 { 18 count++; 19 if (__builtin_constant_p(which)) 20 __bpf_unreachable(); 21 bpf_tail_call(skb, &jmp_table, which); 22 return 1; 23 } 24 25 SEC("tc") 26 int entry(struct __sk_buff *skb) 27 { 28 if (__builtin_constant_p(which)) 29 __bpf_unreachable(); 30 bpf_tail_call(skb, &jmp_table, which); 31 return 0; 32 } 33 34 char __license[] SEC("license") = "GPL"; 35