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tcp: Abstract back handling peer aliveness test into helper function. 

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2012-07-09 16:19:30 -07:00
parent 4aabd8ef8c
commit ab92bb2f67
4 changed files with 13 additions and 2 deletions
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1
include/net/tcp.h
View File

@ -389,6 +389,7 @@ extern void tcp_enter_loss(struct sock *sk, int how);
extern void tcp_clear_retrans(struct tcp_sock *tp);
extern void tcp_update_metrics(struct sock *sk);
extern void tcp_init_metrics(struct sock *sk);
extern bool tcp_peer_is_proven(struct request_sock *req, struct dst_entry *dst);
extern void tcp_disable_fack(struct tcp_sock *tp);
extern void tcp_close(struct sock *sk, long timeout);
extern void tcp_init_sock(struct sock *sk);

2
net/ipv4/tcp_ipv4.c
View File

@ -1405,7 +1405,7 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
(sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) <
(sysctl_max_syn_backlog >> 2)) &&
(!peer || !peer->tcp_ts_stamp) &&
(!dst || !dst_metric(dst, RTAX_RTT))) {
!tcp_peer_is_proven(req, dst)) {
/* Without syncookies last quarter of
* backlog is filled with destinations,
* proven to be alive.

10
net/ipv4/tcp_metrics.c
View File

@ -1,7 +1,9 @@
#include <linux/module.h>
#include <linux/cache.h>
#include <linux/tcp.h>
#include <net/inet_connection_sock.h>
#include <net/request_sock.h>
#include <net/sock.h>
#include <net/dst.h>
#include <net/tcp.h>
@ -190,3 +192,11 @@ void tcp_init_metrics(struct sock *sk)
tp->snd_cwnd = tcp_init_cwnd(tp, dst);
tp->snd_cwnd_stamp = tcp_time_stamp;
}
bool tcp_peer_is_proven(struct request_sock *req, struct dst_entry *dst)
{
if (!dst)
return false;
return dst_metric(dst, RTAX_RTT) ? true : false;
}
EXPORT_SYMBOL_GPL(tcp_peer_is_proven);

2
net/ipv6/tcp_ipv6.c
View File

@ -1177,7 +1177,7 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
(sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) <
(sysctl_max_syn_backlog >> 2)) &&
(!peer || !peer->tcp_ts_stamp) &&
(!dst || !dst_metric(dst, RTAX_RTT))) {
!tcp_peer_is_proven(req, dst)) {
/* Without syncookies last quarter of
* backlog is filled with destinations,
* proven to be alive.