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68 lines
1.3 KiB
68 lines
1.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* Refer to samples/bpf/tcp_bpf.readme for the instructions on |
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* how to run this sample program. |
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*/ |
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#include <linux/bpf.h> |
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#include <bpf/bpf_helpers.h> |
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#include <bpf/bpf_endian.h> |
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#define INTERVAL 1000000000ULL |
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int _version SEC("version") = 1; |
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char _license[] SEC("license") = "GPL"; |
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struct { |
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__u32 type; |
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__u32 map_flags; |
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int *key; |
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__u64 *value; |
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} bpf_next_dump SEC(".maps") = { |
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.type = BPF_MAP_TYPE_SK_STORAGE, |
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.map_flags = BPF_F_NO_PREALLOC, |
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}; |
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SEC("sockops") |
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int _sockops(struct bpf_sock_ops *ctx) |
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{ |
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struct bpf_tcp_sock *tcp_sk; |
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struct bpf_sock *sk; |
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__u64 *next_dump; |
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__u64 now; |
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switch (ctx->op) { |
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case BPF_SOCK_OPS_TCP_CONNECT_CB: |
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bpf_sock_ops_cb_flags_set(ctx, BPF_SOCK_OPS_RTT_CB_FLAG); |
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return 1; |
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case BPF_SOCK_OPS_RTT_CB: |
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break; |
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default: |
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return 1; |
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} |
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sk = ctx->sk; |
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if (!sk) |
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return 1; |
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next_dump = bpf_sk_storage_get(&bpf_next_dump, sk, 0, |
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BPF_SK_STORAGE_GET_F_CREATE); |
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if (!next_dump) |
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return 1; |
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now = bpf_ktime_get_ns(); |
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if (now < *next_dump) |
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return 1; |
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tcp_sk = bpf_tcp_sock(sk); |
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if (!tcp_sk) |
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return 1; |
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*next_dump = now + INTERVAL; |
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bpf_printk("dsack_dups=%u delivered=%u\n", |
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tcp_sk->dsack_dups, tcp_sk->delivered); |
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bpf_printk("delivered_ce=%u icsk_retransmits=%u\n", |
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tcp_sk->delivered_ce, tcp_sk->icsk_retransmits); |
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return 1; |
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}
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