linux-kernel - Re: [PATCH] net: ipv6: Truncate single route when it doesn't fit into dump buffer.

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Message-ID: <20170512214107.w3q7ycl6wm7phwox@lopatka.joja.cz>
Date:   Fri, 12 May 2017 23:41:08 +0200
From:   Jan Moskyto Matejka <mq@....cz>
To:     David Ahern <dsahern@...il.com>
Cc:     David Miller <davem@...emloft.net>, mq@....cz,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        dsa@...ulusnetworks.com, kuznet@....inr.ac.ru, jmorris@...ei.org,
        yoshfuji@...ux-ipv6.org, kaber@...sh.net
Subject: Re: [PATCH] net: ipv6: Truncate single route when it doesn't fit
 into dump buffer.

On Fri, May 12, 2017 at 10:26:08AM -0700, David Ahern wrote:
> On 5/12/17 8:24 AM, David Miller wrote:
> > From: Jan Moskyto Matejka <mq@....cz>
> > Date: Fri, 12 May 2017 13:15:10 +0200
> > 
> >> -int rt6_dump_route(struct rt6_info *rt, void *p_arg);
> >> +int rt6_dump_route(struct rt6_info *rt, void *p_arg, int truncate);
> > 
> > Please use "bool" and "true"/"false" for boolean values.
> > 
> > What does ipv4 do in this situation?
> > 
> > I'm hesitant to be OK with adding a new nlmsg flag just for this case
> > if we solve this problem differently and using existing mechanisms
> > elsewhere.
> > 
> 
> I'll take a look at this later today or this weekend; we can't just
> truncate the route returned to userspace.

Agreed. My favourite would be skb realloc somewhere inside the dump loop
... but I don't know whether it's feasible.

MQ