Stanislav Fomichev | 3953388 | 2019-07-02 09:14:02 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* Refer to samples/bpf/tcp_bpf.readme for the instructions on |
| 3 | * how to run this sample program. |
| 4 | */ |
| 5 | #include <linux/bpf.h> |
| 6 | |
Toke Høiland-Jørgensen | 7cf245a | 2020-01-20 14:06:49 +0100 | [diff] [blame] | 7 | #include <bpf/bpf_helpers.h> |
| 8 | #include <bpf/bpf_endian.h> |
Stanislav Fomichev | 3953388 | 2019-07-02 09:14:02 -0700 | [diff] [blame] | 9 | |
| 10 | #define INTERVAL 1000000000ULL |
| 11 | |
| 12 | int _version SEC("version") = 1; |
| 13 | char _license[] SEC("license") = "GPL"; |
| 14 | |
| 15 | struct { |
| 16 | __u32 type; |
| 17 | __u32 map_flags; |
| 18 | int *key; |
| 19 | __u64 *value; |
| 20 | } bpf_next_dump SEC(".maps") = { |
| 21 | .type = BPF_MAP_TYPE_SK_STORAGE, |
| 22 | .map_flags = BPF_F_NO_PREALLOC, |
| 23 | }; |
| 24 | |
| 25 | SEC("sockops") |
| 26 | int _sockops(struct bpf_sock_ops *ctx) |
| 27 | { |
| 28 | struct bpf_tcp_sock *tcp_sk; |
| 29 | struct bpf_sock *sk; |
| 30 | __u64 *next_dump; |
| 31 | __u64 now; |
| 32 | |
| 33 | switch (ctx->op) { |
| 34 | case BPF_SOCK_OPS_TCP_CONNECT_CB: |
| 35 | bpf_sock_ops_cb_flags_set(ctx, BPF_SOCK_OPS_RTT_CB_FLAG); |
| 36 | return 1; |
| 37 | case BPF_SOCK_OPS_RTT_CB: |
| 38 | break; |
| 39 | default: |
| 40 | return 1; |
| 41 | } |
| 42 | |
| 43 | sk = ctx->sk; |
| 44 | if (!sk) |
| 45 | return 1; |
| 46 | |
| 47 | next_dump = bpf_sk_storage_get(&bpf_next_dump, sk, 0, |
| 48 | BPF_SK_STORAGE_GET_F_CREATE); |
| 49 | if (!next_dump) |
| 50 | return 1; |
| 51 | |
| 52 | now = bpf_ktime_get_ns(); |
| 53 | if (now < *next_dump) |
| 54 | return 1; |
| 55 | |
| 56 | tcp_sk = bpf_tcp_sock(sk); |
| 57 | if (!tcp_sk) |
| 58 | return 1; |
| 59 | |
| 60 | *next_dump = now + INTERVAL; |
| 61 | |
| 62 | bpf_printk("dsack_dups=%u delivered=%u\n", |
| 63 | tcp_sk->dsack_dups, tcp_sk->delivered); |
| 64 | bpf_printk("delivered_ce=%u icsk_retransmits=%u\n", |
| 65 | tcp_sk->delivered_ce, tcp_sk->icsk_retransmits); |
| 66 | |
| 67 | return 1; |
| 68 | } |