From: Hannes Frederic Sowa <hannes@stressinduktion.org>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Florian Westphal <fw@strlen.de>,
David Miller <davem@davemloft.net>,
netdev@vger.kernel.org
Subject: Re: updates to syncookies - timestamps not needed any more (freebsd)
Date: Fri, 26 Jul 2013 08:45:44 +0200 [thread overview]
Message-ID: <20130726064544.GC24247@order.stressinduktion.org> (raw)
In-Reply-To: <1373637885.10804.7.camel@edumazet-glaptop>
Hi Eric!
On Fri, Jul 12, 2013 at 07:04:45AM -0700, Eric Dumazet wrote:
> BTW, following patch allows to test more easily syncookies behavior.
>
> If sysctl_tcp_syncookies is set to 2, we always use syncookies.
>
> diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
> index 35675e4..590659e 100644
> --- a/net/ipv4/tcp_ipv4.c
> +++ b/net/ipv4/tcp_ipv4.c
> @@ -1462,7 +1462,8 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
> * limitations, they conserve resources and peer is
> * evidently real one.
> */
> - if (inet_csk_reqsk_queue_is_full(sk) && !isn) {
> + if ((sysctl_tcp_syncookies == 2 ||
> + inet_csk_reqsk_queue_is_full(sk)) && !isn) {
> want_cookie = tcp_syn_flood_action(sk, skb, "TCP");
> if (!want_cookie)
> goto drop;
>
While cleaning up my patch directory I found this snippet. Perhaps you
could send it for inclusion for net-next? Three nice additions: a similar
change in tcp_ipv6.c and perhaps get rid of the warning messages printed
to the console in case of syncookies == 2? A small update to ip-sysctl.txt
wouldn't hurt either.
If you want to, I can take it and refresh it.
Thanks,
Hannes
next prev parent reply other threads:[~2013-07-26 6:45 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-08 16:04 updates to syncookies - timestamps not needed any more (freebsd) Hannes Frederic Sowa
2013-07-08 16:39 ` Eric Dumazet
2013-07-08 18:09 ` Hannes Frederic Sowa
2013-07-11 23:57 ` David Miller
2013-07-12 1:41 ` Hannes Frederic Sowa
2013-07-12 2:25 ` Eric Dumazet
2013-07-12 6:59 ` richard -rw- weinberger
2013-07-12 15:22 ` Rick Jones
2013-07-12 16:18 ` Eric Dumazet
2013-07-12 16:33 ` Rick Jones
2013-07-12 17:00 ` Eric Dumazet
2013-07-12 7:24 ` David Miller
2013-07-12 8:41 ` Florian Westphal
2013-07-12 14:04 ` Eric Dumazet
2013-07-12 14:25 ` Florian Westphal
2013-07-12 14:32 ` Eric Dumazet
2013-07-12 23:37 ` David Miller
2013-07-26 6:45 ` Hannes Frederic Sowa [this message]
2013-07-26 12:56 ` Eric Dumazet
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