1// SPDX-License-Identifier: GPL-2.0 2#include "vmlinux.h" 3#include "bpf_tracing_net.h" 4#include <bpf/bpf_helpers.h> 5 6struct 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 14int bpf_skb_set_xfrm_info(struct __sk_buff *skb_ctx, 15 const struct bpf_xfrm_info___local *from) __ksym; 16int bpf_skb_get_xfrm_info(struct __sk_buff *skb_ctx, 17 struct bpf_xfrm_info___local *to) __ksym; 18 19SEC("tc") 20int 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 27SEC("tc") 28int 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 40char _license[] SEC("license") = "GPL"; 41