netdev - Re: [net-next-2.6 PATCH v7 3/7 RFC] TCPCT part 1c: sysctl_tcp_cookie_size, socket option TCP_COOKIE

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Date:	Sat, 21 Nov 2009 11:51:13 -0500
From:	William Allen Simpson <william.allen.simpson@...il.com>
To:	David Miller <davem@...emloft.net>
CC:	netdev@...r.kernel.org, Joe Perches <joe@...ches.com>
Subject: Re: [net-next-2.6 PATCH v7 3/7 RFC] TCPCT part 1c: sysctl_tcp_cookie_size,
 socket option TCP_COOKIE_TRANSACTIONS

David Miller wrote:
> From: William Allen Simpson <william.allen.simpson@...il.com>
> Date: Fri, 20 Nov 2009 09:33:51 -0500
> 
>> @@ -59,6 +59,14 @@ int sysctl_tcp_base_mss __read_mostly = 512;
>>  /* By default, RFC2861 behavior.  */
>>  int sysctl_tcp_slow_start_after_idle __read_mostly = 1;
>>  
>> +#ifdef CONFIG_SYSCTL
>> +/* By default, let the user enable it. */
>> +int sysctl_tcp_cookie_size __read_mostly = 0;
>> +#else
>> +int sysctl_tcp_cookie_size __read_mostly = TCP_COOKIE_MAX;
>> +#endif
>> +
> 
> I would prefer if the default did not depend upon whether
> SYSCTL is enabled or not.  That's extremely non-intuitive.
> 
> 
This code was based on net/ipv4/tcp_minisocks.c for syncookies.
Apparently, default for syncookies has been controversial.

Would you accept always default to TCP_COOKIE_MAX?

The code already automatically reduces the size of the cookie to
match available space in the TCP options (part 1f).
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