linux-kernel - Re: [PATCH 2/2] netlink: Diag core and basic socket info dumping

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Date:	Thu, 21 Mar 2013 18:31:19 +0400
From:	Andrew Vagin <avagin@...allels.com>
To:	Thomas Graf <tgraf@...g.ch>
CC:	Andrey Vagin <avagin@...nvz.org>, <linux-kernel@...r.kernel.org>,
	<netdev@...r.kernel.org>, "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Gao feng <gaofeng@...fujitsu.com>
Subject: Re: [PATCH 2/2] netlink: Diag core and basic socket info dumping

On Thu, Mar 21, 2013 at 12:52:30PM +0000, Thomas Graf wrote:
> On 03/21/13 at 01:21pm, Andrey Vagin wrote:
> > diff --git a/include/uapi/linux/netlink_diag.h b/include/uapi/linux/netlink_diag.h
> > new file mode 100644
> > index 0000000..9328866
> > --- /dev/null
> > +++ b/include/uapi/linux/netlink_diag.h
> > +enum {
> > +	NETLINK_DIAG_MEMINFO,
> > +	NETLINK_DIAG_GROUPS,
> > +
> > +	NETLINK_DIAG_MAX,
> > +};
> 
> Please follow the common pattern and define NETLINK_DIAG_MAX as
> NETLINK_DIAG_GROUPS like other by doing>
> 
> 	[...] 
>         __NETLINK_DIAG_MAX,
> };
>  
> #define NETLINK_DIAG_MAX (__NETLINK_DIAG_MAX - 1)
>  
> Everyone is used to do:
>  
>         struct nlattr *attrs[NETLINK_DIAG_MAX+1];
>          
>         nla_parse([...], NETLINK_DIAG_MAX, [...]
> 

Thank you for this issue. I sent the separate patch
"[PATCH] net: fix *_DIAG_MAX constants", because currently only
INET_DIAG_MAX is correct.

> In fact, the follow-up patch to ss is buggy because of this.
> UNIX_DIAG_MAX suffers from the same problem which is problem the
> cause for this.

The code in ss looks like you described:
        struct rtattr *tb[UNIX_DIAG_MAX+1];
...
        parse_rtattr(tb, UNIX_DIAG_MAX, (struct rtattr*)(r+1),
                     nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));


        struct rtattr *tb[NETLINK_DIAG_MAX+1];
...
        parse_rtattr(tb, NETLINK_DIAG_MAX, (struct rtattr*)(r+1),
                     nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*r)))

I think I should only update headers... Or I don't understand something.
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