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

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Message-Id: <20170512.133446.1511184455056119469.davem@davemloft.net>
Date:   Fri, 12 May 2017 13:34:46 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     dsahern@...il.com
Cc:     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.

From: David Ahern <dsahern@...il.com>
Date: Fri, 12 May 2017 10:26:08 -0700

> 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.