linux-kernel - Re: a problem tcp_v4

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Date:	Fri, 12 Nov 2010 22:18:38 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	kuznet@....inr.ac.ru, kaber@...sh.net, equinox@...c24.net,
	eparis@...hat.com, hzhong@...il.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, pekkas@...core.fi, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, paul.moore@...com,
	damian@....rwth-aachen.de
Subject: Re: a problem tcp_v4_err()

Le vendredi 12 novembre 2010 à 11:22 -0800, David Miller a écrit :
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Fri, 12 Nov 2010 19:33:23 +0100
> 
> > I CC Damian Lukowski in my previous answer (and this one too)
> 
> Probably the safest fix is this:
> 
> diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
> index 8f8527d..69ccbc1 100644
> --- a/net/ipv4/tcp_ipv4.c
> +++ b/net/ipv4/tcp_ipv4.c
> @@ -415,6 +415,9 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
>  		    !icsk->icsk_backoff)
>  			break;
>  
> +		if (sock_owned_by_user(sk))
> +			break;
> +
>  		icsk->icsk_backoff--;
>  		inet_csk(sk)->icsk_rto = __tcp_set_rto(tp) <<
>  					 icsk->icsk_backoff;
> @@ -429,11 +432,6 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
>  		if (remaining) {
>  			inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
>  						  remaining, TCP_RTO_MAX);
> -		} else if (sock_owned_by_user(sk)) {
> -			/* RTO revert clocked out retransmission,
> -			 * but socket is locked. Will defer. */
> -			inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
> -						  HZ/20, TCP_RTO_MAX);
>  		} else {
>  			/* RTO revert clocked out retransmission.
>  			 * Will retransmit now */


Acked-by: Eric Dumazet <eric.dumazet@...il.com>



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