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

   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/bpf.h>
   3#include <bpf/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 {
  17        __uint(type, BPF_MAP_TYPE_SK_STORAGE);
  18        __uint(map_flags, BPF_F_NO_PREALLOC);
  19        __type(key, int);
  20        __type(value, struct tcp_rtt_storage);
  21} socket_storage_map SEC(".maps");
  22
  23SEC("sockops")
  24int _sockops(struct bpf_sock_ops *ctx)
  25{
  26        struct tcp_rtt_storage *storage;
  27        struct bpf_tcp_sock *tcp_sk;
  28        int op = (int) ctx->op;
  29        struct bpf_sock *sk;
  30
  31        sk = ctx->sk;
  32        if (!sk)
  33                return 1;
  34
  35        storage = bpf_sk_storage_get(&socket_storage_map, sk, 0,
  36                                     BPF_SK_STORAGE_GET_F_CREATE);
  37        if (!storage)
  38                return 1;
  39
  40        if (op == BPF_SOCK_OPS_TCP_CONNECT_CB) {
  41                bpf_sock_ops_cb_flags_set(ctx, BPF_SOCK_OPS_RTT_CB_FLAG);
  42                return 1;
  43        }
  44
  45        if (op != BPF_SOCK_OPS_RTT_CB)
  46                return 1;
  47
  48        tcp_sk = bpf_tcp_sock(sk);
  49        if (!tcp_sk)
  50                return 1;
  51
  52        storage->invoked++;
  53
  54        storage->dsack_dups = tcp_sk->dsack_dups;
  55        storage->delivered = tcp_sk->delivered;
  56        storage->delivered_ce = tcp_sk->delivered_ce;
  57        storage->icsk_retransmits = tcp_sk->icsk_retransmits;
  58
  59        return 1;
  60}
  61