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