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