// SPDX-License-Identifier: GPL-2.0 #include <linux/bpf.h> #include <bpf/bpf_helpers.h> #include "bpf_legacy.h" struct { __uint(type, BPF_MAP_TYPE_PROG_ARRAY); __uint(max_entries, 1); __uint(key_size, sizeof(__u32)); __uint(value_size, sizeof(__u32)); } jmp_table SEC(".maps"); static __noinline int subprog_tail(struct __sk_buff *skb) { if (load_byte(skb, 0)) bpf_tail_call_static(skb, &jmp_table, 1); else bpf_tail_call_static(skb, &jmp_table, 0); return 1; } int count = 0; SEC("tc") int classifier_0(struct __sk_buff *skb) { count++; return subprog_tail(skb); } SEC("tc") int entry(struct __sk_buff *skb) { bpf_tail_call_static(skb, &jmp_table, 0); return 0; } char __license[] SEC("license") = "GPL";