| // SPDX-License-Identifier: GPL-2.0 |
| #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"; |