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