1*79d49ba0SDaniel Borkmann // SPDX-License-Identifier: GPL-2.0 2*79d49ba0SDaniel Borkmann #include <linux/bpf.h> 3*79d49ba0SDaniel Borkmann 4*79d49ba0SDaniel Borkmann #include "bpf_helpers.h" 5*79d49ba0SDaniel Borkmann 6*79d49ba0SDaniel Borkmann struct { 7*79d49ba0SDaniel Borkmann __uint(type, BPF_MAP_TYPE_PROG_ARRAY); 8*79d49ba0SDaniel Borkmann __uint(max_entries, 3); 9*79d49ba0SDaniel Borkmann __uint(key_size, sizeof(__u32)); 10*79d49ba0SDaniel Borkmann __uint(value_size, sizeof(__u32)); 11*79d49ba0SDaniel Borkmann } jmp_table SEC(".maps"); 12*79d49ba0SDaniel Borkmann 13*79d49ba0SDaniel Borkmann static volatile int selector; 14*79d49ba0SDaniel Borkmann 15*79d49ba0SDaniel Borkmann #define TAIL_FUNC(x) \ 16*79d49ba0SDaniel Borkmann SEC("classifier/" #x) \ 17*79d49ba0SDaniel Borkmann int bpf_func_##x(struct __sk_buff *skb) \ 18*79d49ba0SDaniel Borkmann { \ 19*79d49ba0SDaniel Borkmann return x; \ 20*79d49ba0SDaniel Borkmann } 21*79d49ba0SDaniel Borkmann TAIL_FUNC(0) 22*79d49ba0SDaniel Borkmann TAIL_FUNC(1) 23*79d49ba0SDaniel Borkmann TAIL_FUNC(2) 24*79d49ba0SDaniel Borkmann 25*79d49ba0SDaniel Borkmann SEC("classifier") 26*79d49ba0SDaniel Borkmann int entry(struct __sk_buff *skb) 27*79d49ba0SDaniel Borkmann { 28*79d49ba0SDaniel Borkmann int idx = 0; 29*79d49ba0SDaniel Borkmann 30*79d49ba0SDaniel Borkmann if (selector == 1234) 31*79d49ba0SDaniel Borkmann idx = 1; 32*79d49ba0SDaniel Borkmann else if (selector == 5678) 33*79d49ba0SDaniel Borkmann idx = 2; 34*79d49ba0SDaniel Borkmann 35*79d49ba0SDaniel Borkmann bpf_tail_call(skb, &jmp_table, idx); 36*79d49ba0SDaniel Borkmann return 3; 37*79d49ba0SDaniel Borkmann } 38*79d49ba0SDaniel Borkmann 39*79d49ba0SDaniel Borkmann char __license[] SEC("license") = "GPL"; 40*79d49ba0SDaniel Borkmann int _version SEC("version") = 1; 41