blob: a1d9f106c3f0688e163647c093bcf7ba5e835180 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
// SPDX-License-Identifier: GPL-2.0
#define BPF_NO_KFUNC_PROTOTYPES
#include "vmlinux.h"
#include "bpf_tracing_net.h"
#include <bpf/bpf_helpers.h>
struct bpf_xfrm_info___local {
u32 if_id;
int link;
} __attribute__((preserve_access_index));
__u32 req_if_id;
__u32 resp_if_id;
int bpf_skb_set_xfrm_info(struct __sk_buff *skb_ctx,
const struct bpf_xfrm_info___local *from) __ksym;
int bpf_skb_get_xfrm_info(struct __sk_buff *skb_ctx,
struct bpf_xfrm_info___local *to) __ksym;
SEC("tc")
int set_xfrm_info(struct __sk_buff *skb)
{
struct bpf_xfrm_info___local info = { .if_id = req_if_id };
return bpf_skb_set_xfrm_info(skb, &info) ? TC_ACT_SHOT : TC_ACT_UNSPEC;
}
SEC("tc")
int get_xfrm_info(struct __sk_buff *skb)
{
struct bpf_xfrm_info___local info = {};
if (bpf_skb_get_xfrm_info(skb, &info) < 0)
return TC_ACT_SHOT;
resp_if_id = info.if_id;
return TC_ACT_UNSPEC;
}
char _license[] SEC("license") = "GPL";
|
