tailcall_freplace.c

 1// SPDX-License-Identifier: GPL-2.0
 2
 3#include <linux/bpf.h>
 4#include <bpf/bpf_helpers.h>
 5
 6struct {
 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
13int count = 0;
14
15SEC("freplace")
16int entry_freplace(struct __sk_buff *skb)
17{
18	count++;
19	bpf_tail_call_static(skb, &jmp_table, 0);
20	return count;
21}
22
23char __license[] SEC("license") = "GPL";