mirror of https://gitee.com/openkylin/linux.git
49 lines
1.0 KiB
C
49 lines
1.0 KiB
C
// 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, 3);
|
|
__uint(key_size, sizeof(__u32));
|
|
__uint(value_size, sizeof(__u32));
|
|
} jmp_table SEC(".maps");
|
|
|
|
#define TAIL_FUNC(x) \
|
|
SEC("classifier/" #x) \
|
|
int bpf_func_##x(struct __sk_buff *skb) \
|
|
{ \
|
|
return x; \
|
|
}
|
|
TAIL_FUNC(0)
|
|
TAIL_FUNC(1)
|
|
TAIL_FUNC(2)
|
|
|
|
SEC("classifier")
|
|
int entry(struct __sk_buff *skb)
|
|
{
|
|
/* Multiple locations to make sure we patch
|
|
* all of them.
|
|
*/
|
|
bpf_tail_call(skb, &jmp_table, 0);
|
|
bpf_tail_call(skb, &jmp_table, 0);
|
|
bpf_tail_call(skb, &jmp_table, 0);
|
|
bpf_tail_call(skb, &jmp_table, 0);
|
|
|
|
bpf_tail_call(skb, &jmp_table, 1);
|
|
bpf_tail_call(skb, &jmp_table, 1);
|
|
bpf_tail_call(skb, &jmp_table, 1);
|
|
bpf_tail_call(skb, &jmp_table, 1);
|
|
|
|
bpf_tail_call(skb, &jmp_table, 2);
|
|
bpf_tail_call(skb, &jmp_table, 2);
|
|
bpf_tail_call(skb, &jmp_table, 2);
|
|
bpf_tail_call(skb, &jmp_table, 2);
|
|
|
|
return 3;
|
|
}
|
|
|
|
char __license[] SEC("license") = "GPL";
|
|
int _version SEC("version") = 1;
|