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27#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#define __unused __attribute__((unused))
char __license[] SEC("license") = "GPL";
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");
SEC("tc")
int target_prog(struct __sk_buff *skb __unused)
{
return 0xcafe;
}
SEC("tc")
int entry_prog(struct __sk_buff *skb)
{
bpf_tail_call(skb, &jmp_table, 0);
return 0xf00d;
}