netdev - Re: [PATCH net-next] tcp: implement RFC 5961 4.2

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Date:	Tue, 17 Jul 2012 15:10:06 -0700
From:	Vijay Subramanian <subramanian.vijay@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Kiran Kumar Kella <kkiran@...adcom.com>
Subject: Re: [PATCH net-next] tcp: implement RFC 5961 4.2

> But you probably are right, we could test th->syn here as well.
>
> Something like that ?

> -               if (!th->rst)
> +               if (!th->rst) {
> +                       if (th->syn)
> +                               goto syn_challenge;
>                         tcp_send_dupack(sk, skb);
> +               }
>                 goto discard;
>         }
>
> @@ -5327,6 +5330,7 @@ static bool tcp_validate_incoming(struct sock *sk, struct sk_buff *skb,
>          * RFC 5691 4.2 : Send a challenge ack
>          */
>         if (th->syn) {
> +syn_challenge:
>                 if (syn_inerr)
>                         TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
>                 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPSYNCHALLENGE);
>

Yes. This is what I had in mind (along with a change to make
tcp_sequence() return bool). I am not sure if this patch is official
(or will be picked up by patchwork) but
for what its worth

Acked-by: Vijay Subramanian <subramanian.vijay@...il.com>

I will send a separate patch to make tcp_sequence() return bool.
Thanks!
Vijay
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