// SPDX-License-Identifier: GPL-2.0
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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char _license[] SEC("license") = "GPL";
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__u32 _version SEC("version") = 1;
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struct tcp_rtt_storage {
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__u32 invoked;
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__u32 dsack_dups;
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__u32 delivered;
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__u32 delivered_ce;
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__u32 icsk_retransmits;
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};
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struct {
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__uint(type, BPF_MAP_TYPE_SK_STORAGE);
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__uint(map_flags, BPF_F_NO_PREALLOC);
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__type(key, int);
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__type(value, struct tcp_rtt_storage);
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} socket_storage_map SEC(".maps");
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SEC("sockops")
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int _sockops(struct bpf_sock_ops *ctx)
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{
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struct tcp_rtt_storage *storage;
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struct bpf_tcp_sock *tcp_sk;
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int op = (int) ctx->op;
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struct bpf_sock *sk;
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sk = ctx->sk;
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if (!sk)
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return 1;
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storage = bpf_sk_storage_get(&socket_storage_map, sk, 0,
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BPF_SK_STORAGE_GET_F_CREATE);
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if (!storage)
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return 1;
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if (op == BPF_SOCK_OPS_TCP_CONNECT_CB) {
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bpf_sock_ops_cb_flags_set(ctx, BPF_SOCK_OPS_RTT_CB_FLAG);
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return 1;
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}
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if (op != BPF_SOCK_OPS_RTT_CB)
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return 1;
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tcp_sk = bpf_tcp_sock(sk);
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if (!tcp_sk)
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return 1;
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storage->invoked++;
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storage->dsack_dups = tcp_sk->dsack_dups;
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storage->delivered = tcp_sk->delivered;
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storage->delivered_ce = tcp_sk->delivered_ce;
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storage->icsk_retransmits = tcp_sk->icsk_retransmits;
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return 1;
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}
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