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Commit ab92bb2f authored by David S. Miller's avatar David S. Miller
Browse files

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



Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4aabd8ef

include/net/tcp.h

+1 −0
Original line number Diff line number Diff line
@@ -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);

net/ipv4/tcp_ipv4.c

+1 −1
Original line number Diff line number Diff line
@@ -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.

net/ipv4/tcp_metrics.c

+10 −0
Original line number Diff line number Diff line 
#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 @@ reset: 
		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);

net/ipv6/tcp_ipv6.c

+1 −1
Original line number Diff line number Diff line
@@ -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.