mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-21 11:44:01 +08:00
49d0900787
Both netlink and /proc/net/tcp interfaces can report transient negative values for rx queue. ss -> State Recv-Q Send-Q Local Address:Port Peer Address:Port ESTAB -6 6 127.0.0.1:45956 127.0.0.1:3333 netstat -> tcp 4294967290 6 127.0.0.1:37784 127.0.0.1:3333 ESTABLISHED This is because we dont lock socket while computing tp->rcv_nxt - tp->copied_seq, and another CPU can update copied_seq before rcv_next in RX path. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/*
|
|
* tcp_diag.c Module for monitoring TCP transport protocols sockets.
|
|
*
|
|
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/inet_diag.h>
|
|
|
|
#include <linux/tcp.h>
|
|
|
|
#include <net/tcp.h>
|
|
|
|
static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
|
|
void *_info)
|
|
{
|
|
const struct tcp_sock *tp = tcp_sk(sk);
|
|
struct tcp_info *info = _info;
|
|
|
|
if (sk->sk_state == TCP_LISTEN) {
|
|
r->idiag_rqueue = sk->sk_ack_backlog;
|
|
r->idiag_wqueue = sk->sk_max_ack_backlog;
|
|
} else {
|
|
r->idiag_rqueue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0);
|
|
r->idiag_wqueue = tp->write_seq - tp->snd_una;
|
|
}
|
|
if (info != NULL)
|
|
tcp_get_info(sk, info);
|
|
}
|
|
|
|
static const struct inet_diag_handler tcp_diag_handler = {
|
|
.idiag_hashinfo = &tcp_hashinfo,
|
|
.idiag_get_info = tcp_diag_get_info,
|
|
.idiag_type = TCPDIAG_GETSOCK,
|
|
.idiag_info_size = sizeof(struct tcp_info),
|
|
};
|
|
|
|
static int __init tcp_diag_init(void)
|
|
{
|
|
return inet_diag_register(&tcp_diag_handler);
|
|
}
|
|
|
|
static void __exit tcp_diag_exit(void)
|
|
{
|
|
inet_diag_unregister(&tcp_diag_handler);
|
|
}
|
|
|
|
module_init(tcp_diag_init);
|
|
module_exit(tcp_diag_exit);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_INET_DIAG, TCPDIAG_GETSOCK);
|