// SPDX-License-Identifier: GPL-2.0 #include <linux/bpf.h> #include <bpf/bpf_helpers.h> struct { __uint(type, BPF_MAP_TYPE_PROG_ARRAY); __uint(max_entries, 5); __uint(key_size, sizeof(__u32)); __uint(value_size, sizeof(__u32)); } jmp_table SEC(".maps"); SEC("tc") int classifier_0(struct __sk_buff *skb) { bpf_tail_call_static(skb, &jmp_table, 1); return 0; } SEC("tc") int classifier_1(struct __sk_buff *skb) { bpf_tail_call_static(skb, &jmp_table, 2); return 1; } SEC("tc") int classifier_2(struct __sk_buff *skb) { return 2; } SEC("tc") int classifier_3(struct __sk_buff *skb) { bpf_tail_call_static(skb, &jmp_table, 4); return 3; } SEC("tc") int classifier_4(struct __sk_buff *skb) { bpf_tail_call_static(skb, &jmp_table, 3); return 4; } SEC("tc") int entry(struct __sk_buff *skb) { bpf_tail_call_static(skb, &jmp_table, 0); /* Check multi-prog update. */ bpf_tail_call_static(skb, &jmp_table, 2); /* Check tail call limit. */ bpf_tail_call_static(skb, &jmp_table, 3); return 3; } char __license[] SEC("license") = "GPL";