41 lines
904 B
C
41 lines
904 B
C
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// SPDX-License-Identifier: GPL-2.0
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#include "vmlinux.h"
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#include "bpf_tracing_net.h"
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#include <bpf/bpf_helpers.h>
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struct bpf_xfrm_info___local {
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u32 if_id;
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int link;
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} __attribute__((preserve_access_index));
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__u32 req_if_id;
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__u32 resp_if_id;
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int bpf_skb_set_xfrm_info(struct __sk_buff *skb_ctx,
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const struct bpf_xfrm_info___local *from) __ksym;
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int bpf_skb_get_xfrm_info(struct __sk_buff *skb_ctx,
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struct bpf_xfrm_info___local *to) __ksym;
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SEC("tc")
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int set_xfrm_info(struct __sk_buff *skb)
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{
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struct bpf_xfrm_info___local info = { .if_id = req_if_id };
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return bpf_skb_set_xfrm_info(skb, &info) ? TC_ACT_SHOT : TC_ACT_UNSPEC;
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}
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SEC("tc")
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int get_xfrm_info(struct __sk_buff *skb)
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{
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struct bpf_xfrm_info___local info = {};
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if (bpf_skb_get_xfrm_info(skb, &info) < 0)
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return TC_ACT_SHOT;
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resp_if_id = info.if_id;
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return TC_ACT_UNSPEC;
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}
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char _license[] SEC("license") = "GPL";
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