LXR linux/tools/testing/selftests/bpf/progs/tcp

   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/bpf.h>
   3#include "bpf_helpers.h"
   4
   5char _license[] SEC("license") = "GPL";
   6__u32 _version SEC("version") = 1;
   7
   8struct tcp_rtt_storage {
   9        __u32 invoked;
  10        __u32 dsack_dups;
  11        __u32 delivered;
  12        __u32 delivered_ce;
  13        __u32 icsk_retransmits;
  14};
  15
  16struct bpf_map_def SEC("maps") socket_storage_map = {
  17        .type = BPF_MAP_TYPE_SK_STORAGE,
  18        .key_size = sizeof(int),
  19        .value_size = sizeof(struct tcp_rtt_storage),
  20        .map_flags = BPF_F_NO_PREALLOC,
  21};
  22BPF_ANNOTATE_KV_PAIR(socket_storage_map, int, struct tcp_rtt_storage);
  23
  24SEC("sockops")
  25int _sockops(struct bpf_sock_ops *ctx)
  26{
  27        struct tcp_rtt_storage *storage;
  28        struct bpf_tcp_sock *tcp_sk;
  29        int op = (int) ctx->op;
  30        struct bpf_sock *sk;
  31
  32        sk = ctx->sk;
  33        if (!sk)
  34                return 1;
  35
  36        storage = bpf_sk_storage_get(&socket_storage_map, sk, 0,
  37                                     BPF_SK_STORAGE_GET_F_CREATE);
  38        if (!storage)
  39                return 1;
  40
  41        if (op == BPF_SOCK_OPS_TCP_CONNECT_CB) {
  42                bpf_sock_ops_cb_flags_set(ctx, BPF_SOCK_OPS_RTT_CB_FLAG);
  43                return 1;
  44        }
  45
  46        if (op != BPF_SOCK_OPS_RTT_CB)
  47                return 1;
  48
  49        tcp_sk = bpf_tcp_sock(sk);
  50        if (!tcp_sk)
  51                return 1;
  52
  53        storage->invoked++;
  54
  55        storage->dsack_dups = tcp_sk->dsack_dups;
  56        storage->delivered = tcp_sk->delivered;
  57        storage->delivered_ce = tcp_sk->delivered_ce;
  58        storage->icsk_retransmits = tcp_sk->icsk_retransmits;
  59
  60        return 1;
  61}
  62