netdev - Re: possible kernel oops from user MSS

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Date:	Fri, 12 Nov 2010 14:59:58 -0800
From:	Min Zhang <mzhang@...sta.com>
To:	netdev@...r.kernel.org
Subject: Re: possible kernel oops from user MSS

Regarding commit 7a1abd08d52fdeddb3e9a5a33f2f15cc6a5674d2 ("tcp:
Increase TCP_MAXSEG socket option minimum"). What is the reason
TCP_MAXSEG minimum be 64? Isn't the exact be 40 which is
TCPOLEN_MD5SIG_ALIGNED(20) + TCPOLEN_TSTAMP_ALIGNED(12) + 8?

Or is it better to use TCP_MIN_MSS from tcp.h:

/* Minimal accepted MSS. It is (60+60+8) - (20+20). */
#define TCP_MIN_MSS        88U
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