netdev - Re: [PATCH] tcp: unify tcp flag macros

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Date:	Sat, 12 Jun 2010 17:21:09 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Jan Engelhardt <jengelh@...ozas.de>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org
Subject: Re: [PATCH] tcp: unify tcp flag macros

On Sat, Jun 12, 2010 at 4:18 PM, Jan Engelhardt <jengelh@...ozas.de> wrote:
>
> On Saturday 2010-06-12 07:59, Changli Gao wrote:
>>--- a/include/net/tcp.h
>>+++ b/include/net/tcp.h
>>@@ -602,6 +602,17 @@ extern u32        __tcp_select_window(struct sock *sk);
>>  */
>> #define tcp_time_stamp                ((__u32)(jiffies))
>>
>>+#define tcp_flag_byte(th) (((u_int8_t *)th)[13])
>>+
>>+#define       TH_FIN  0x01
>>+#define       TH_SYN  0x02
>>+#define       TH_RST  0x04
>>+#define       TH_PUSH 0x08
>>+#define       TH_ACK  0x10
>>+#define       TH_URG  0x20
>>+#define       TH_ECE  0x40
>>+#define       TH_CWR  0x80
>
> I'd prefer something less generic, like TCPHDR_{FIN,SYN,etc}.
>
>

The same macros are definied by BSDs too. So I think it is better to
keep them the same.

-- 
Regards,
Changli Gao(xiaosuo@...il.com)
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