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