netdev - Re: iproute2 tools for 2.6.31

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Date:	Fri, 11 Sep 2009 09:51:07 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	unlisted-recipients:; (no To-header on input)
CC:	Stephen Hemminger <shemminger@...tta.com>, netdev@...r.kernel.org
Subject: Re: iproute2 tools for 2.6.31

Eric Dumazet a écrit :
> Stephen Hemminger a écrit :
>> I am putting together release for 2.6.31 based tools.
>> The only open issue is how to deal with the error handling in commands
>> that do monitoring filtering.  Right now leaning towards the two socket
>> solution.
>>
>> So if you have anything else that you have been waiting for,
>> please drop me a note.
>>
> 
> One thing that is IMHO strange is the output of sk information 
> on 64 bits (x86_64 for example)
> 
> # ss -e dst 55.225.18.6
> State      Recv-Q Send-Q                                Local Address:Port                                    Peer Address:Port
> ESTAB      0      0                                      55.225.18.96:9273                                     55.225.18.6:37405    timer:(keepalive,20min,0) ino:57807651 sk:36e40c80ffff8100
> 
> True sk pointer is ffff8100ffff8100, not 36e40c80ffff8100
> 

Oops I meant ffff810036e40c80, sorry for the copy/paste error ;)

> 
> 
> ss/misc.c
> 
>                 printf(" sk:%08x", r->id.idiag_cookie[0]);
>                 if (r->id.idiag_cookie[1] != 0)
>                         printf("%08x", r->id.idiag_cookie[1]);
> 
> while kernel does :
>         r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
>         r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
> 
> 
> 
> What do you think of following patch ?
> 
> [PATCH] ss: correct display of sk pointer
> 
> On 64bit arches, sk pointer was 32/32 reversed.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> ---
> 
> diff --git a/misc/ss.c b/misc/ss.c
> index 651fe3b..2447186 100644
> --- a/misc/ss.c
> +++ b/misc/ss.c
> @@ -1393,9 +1393,10 @@ static int tcp_show_sock(struct nlmsghdr *nlh, struct filter *f)
>  		if (r->idiag_uid)
>  			printf(" uid:%u", (unsigned)r->idiag_uid);
>  		printf(" ino:%u", r->idiag_inode);
> -		printf(" sk:%08x", r->id.idiag_cookie[0]);
> +		printf(" sk:");
>  		if (r->id.idiag_cookie[1] != 0)
>  			printf("%08x", r->id.idiag_cookie[1]);
> + 		printf("%08x", r->id.idiag_cookie[0]);
>  	}
>  	if (show_mem || show_tcpinfo) {
>  		printf("\n\t");
> 
> 
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