netdev - Re: [PATCH nf 2/3] netfilter: ipvs: allow rescheduling after RST

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Date:	Thu, 18 Feb 2016 16:17:17 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Simon Horman <horms@...ge.net.au>,
	Pablo Neira Ayuso <pablo@...filter.org>
Cc:	lvs-devel@...r.kernel.org, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org,
	Wensong Zhang <wensong@...ux-vs.org>,
	Julian Anastasov <ja@....bg>
Subject: Re: [PATCH nf 2/3] netfilter: ipvs: allow rescheduling after RST

Hello.

On 2/18/2016 3:41 AM, Simon Horman wrote:

> From: Julian Anastasov <ja@....bg>
>
> "RFC 5961, 4.2. Mitigation" describes a mechanism to request
> client to confirm with RST the restart of TCP connection
> before resending its SYN. As result, IPVS can see SYNs for
> existing connection in CLOSE state. Add check to allow
> rescheduling in this state.
>
> Signed-off-by: Julian Anastasov <ja@....bg>
> Signed-off-by: Simon Horman <horms@...ge.net.au>
> ---
>   net/netfilter/ipvs/ip_vs_core.c | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
> index 4da560005b0e..0c1d3fef9a7c 100644
> --- a/net/netfilter/ipvs/ip_vs_core.c
> +++ b/net/netfilter/ipvs/ip_vs_core.c
> @@ -1089,6 +1089,7 @@ static inline bool is_new_conn_expected(const struct ip_vs_conn *cp,
>   	switch (cp->protocol) {
>   	case IPPROTO_TCP:
>   		return (cp->state == IP_VS_TCP_S_TIME_WAIT) ||
> +			cp->state == IP_VS_TCP_S_CLOSE ||

    I would have been consistent and enclosed this expression into parens as 
well. BTW, the indentation is not correct anyway.

>   			((conn_reuse_mode & 2) &&
>   			 (cp->state == IP_VS_TCP_S_FIN_WAIT) &&
>   			 (cp->flags & IP_VS_CONN_F_NOOUTPUT));

MBR, Sergei