// 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";