netdev - Re: [PATCH] TCP: Add support for TCP Stealth

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Date:	Thu, 1 Jan 2015 11:10:30 -0800
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Julian Kirsch <kirschju@....in.tum.de>
Cc:	netdev@...r.kernel.org,
	Christian Grothoff <christian@...thoff.org>,
	Jacob Appelbaum <jacob@...elbaum.net>
Subject: Re: [PATCH] TCP: Add support for TCP Stealth

On Wed, 31 Dec 2014 22:54:59 +0100
Julian Kirsch <kirschju@....in.tum.de> wrote:

> +	memcpy(iv, (const __u8 *)daddr,
> +	       (daddr_size > sizeof(iv)) ? sizeof(iv) : daddr_size);
> +
> +#ifdef CONFIG_TCP_MD5SIG
> +	md5 = tp->af_specific->md5_lookup(sk, sk);
> +#else
> +	md5 = NULL;
> +#endif
> +	if (likely(sysctl_tcp_timestamps && !md5) || tp->stealth.saw_tsval)
> +		tsval = tp->stealth.mstamp.stamp_jiffies;
> +
> +	((__be16 *)iv)[2] ^= cpu_to_be16(tp->stealth.integrity_hash);

Cast unnecessary on memcpy arg since it takes void *

Would be clearer to use a real structure or union not assignment to cast to setup iv.
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