tools/testing/selftests/bpf/progs/mptcp_sock.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (c) 2020, Tessares SA. */
   3 /* Copyright (c) 2022, SUSE. */
   4
   5 #include <linux/bpf.h>
   6 #include <bpf/bpf_helpers.h>
   7 #include "bpf_tcp_helpers.h"
   8
   9 char _license[] SEC("license") = "GPL";
  10 __u32 token = 0;
  11
  12 struct mptcp_storage {
  13         __u32 invoked;
  14         __u32 is_mptcp;
  15         __u32 token;
  16 };
  17
  18 struct {
  19         __uint(type, BPF_MAP_TYPE_SK_STORAGE);
  20         __uint(map_flags, BPF_F_NO_PREALLOC);
  21         __type(key, int);
  22         __type(value, struct mptcp_storage);
  23 } socket_storage_map SEC(".maps");
  24
  25 SEC("sockops")
  26 int _sockops(struct bpf_sock_ops *ctx)
  27 {
  28         struct mptcp_storage *storage;
  29         struct mptcp_sock *msk;
  30         int op = (int)ctx->op;
  31         struct tcp_sock *tsk;
  32         struct bpf_sock *sk;
  33         bool is_mptcp;
  34
  35         if (op != BPF_SOCK_OPS_TCP_CONNECT_CB)
  36                 return 1;
  37
  38         sk = ctx->sk;
  39         if (!sk)
  40                 return 1;
  41
  42         tsk = bpf_skc_to_tcp_sock(sk);
  43         if (!tsk)
  44                 return 1;
  45
  46         is_mptcp = bpf_core_field_exists(tsk->is_mptcp) ? tsk->is_mptcp : 0;
  47         if (!is_mptcp) {
  48                 storage = bpf_sk_storage_get(&socket_storage_map, sk, 0,
  49                                              BPF_SK_STORAGE_GET_F_CREATE);
  50                 if (!storage)
  51                         return 1;
  52
  53                 storage->token = 0;
  54         } else {
  55                 msk = bpf_skc_to_mptcp_sock(sk);
  56                 if (!msk)
  57                         return 1;
  58
  59                 storage = bpf_sk_storage_get(&socket_storage_map, msk, 0,
  60                                              BPF_SK_STORAGE_GET_F_CREATE);
  61                 if (!storage)
  62                         return 1;
  63
  64                 storage->token = msk->token;
  65         }
  66         storage->invoked++;
  67         storage->is_mptcp = is_mptcp;
  68
  69         return 1;
  70 }
  71
  72 SEC("fentry/mptcp_pm_new_connection")
  73 int BPF_PROG(trace_mptcp_pm_new_connection, struct mptcp_sock *msk,
  74              const struct sock *ssk, int server_side)
  75 {
  76         if (!server_side)
  77                 token = msk->token;
  78
  79         return 0;
  80 }