1 // SPDX-License-Identifier: GPL-2.0
2 #define BPF_NO_KFUNC_PROTOTYPES
3 #include "vmlinux.h"
4 #include "bpf_tracing_net.h"
5 #include <bpf/bpf_helpers.h>
6
7 struct bpf_xfrm_info___local {
8 u32 if_id;
9 int link;
10 } __attribute__((preserve_access_index));
11
12 __u32 req_if_id;
13 __u32 resp_if_id;
14
15 int bpf_skb_set_xfrm_info(struct __sk_buff *skb_ctx,
16 const struct bpf_xfrm_info___local *from) __ksym;
17 int bpf_skb_get_xfrm_info(struct __sk_buff *skb_ctx,
18 struct bpf_xfrm_info___local *to) __ksym;
19
20 SEC("tc")
21 int set_xfrm_info(struct __sk_buff *skb)
22 {
23 struct bpf_xfrm_info___local info = { .if_id = req_if_id };
24
25 return bpf_skb_set_xfrm_info(skb, &info) ? TC_ACT_SHOT : TC_ACT_UNSPEC;
26 }
27
28 SEC("tc")
29 int get_xfrm_info(struct __sk_buff *skb)
30 {
31 struct bpf_xfrm_info___local info = {};
32
33 if (bpf_skb_get_xfrm_info(skb, &info) < 0)
34 return TC_ACT_SHOT;
35
36 resp_if_id = info.if_id;
37
38 return TC_ACT_UNSPEC;
39 }
40
41 char _license[] SEC("license") = "GPL";
42
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