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1// SPDX-License-Identifier: GPL-2.02#define BPF_NO_KFUNC_PROTOTYPES3#include "vmlinux.h"4#include "bpf_tracing_net.h"5#include <bpf/bpf_helpers.h>6 7struct 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 15int bpf_skb_set_xfrm_info(struct __sk_buff *skb_ctx,16 const struct bpf_xfrm_info___local *from) __ksym;17int bpf_skb_get_xfrm_info(struct __sk_buff *skb_ctx,18 struct bpf_xfrm_info___local *to) __ksym;19 20SEC("tc")21int 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 28SEC("tc")29int 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 41char _license[] SEC("license") = "GPL";42