netdev - Re: [PATCH v3 2/2] netfilter: Create revision 2 of xt

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Date:   Thu, 22 Sep 2016 14:39:45 -0400
From:   Vishwanath Pai <vpai@...mai.com>
To:     Jan Engelhardt <jengelh@...i.de>, pablo@...filter.org
Cc:     kaber@...sh.net, kadlec@...ckhole.kfki.hu, johunt@...mai.com,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org, pai.vishwain@...il.com
Subject: Re: [PATCH v3 2/2] netfilter: Create revision 2 of xt_hashlimit to
 support higher pps rates

Thanks for pointing this out, I will reorder the fields to:

struct hashlimit_cfg2 {
	__u64 avg;    /* Average secs between packets * scale */
	__u64 burst;
	__u32 mode; /* bitmask of XT_HASHLIMIT_HASH_* */

This should fix the hole and avoid padding.

-Vishwanath

On 09/22/2016 12:53 PM, Jan Engelhardt wrote:
> On Thursday 2016-09-22 18:43, Vishwanath Pai wrote:
>> >+struct hashlimit_cfg2 {
>> >+	__u32 mode;	  /* bitmask of XT_HASHLIMIT_HASH_* */
>> >+	__u64 avg;    /* Average secs between packets * scale */
>> >+	__u64 burst;  /* Period multiplier for upper limit. */
> This would have different sizes between i386 and x86_64,
> necessiting additional compat functions. It should be padded
> or reordered instead.
>