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From: Edward Cree <>
To: Pablo Neira Ayuso <>, Florian Westphal <>
Cc: <>
Subject: Re: [PATCH v2 nf-next] netfilter: add and use nf_hook_slow_list()
Date: Mon, 14 Oct 2019 14:56:53 +0100
Message-ID: <> (raw)
In-Reply-To: <20191014110201.6gnd4ewsls7bsmry@salvia>

On 14/10/2019 12:02, Pablo Neira Ayuso wrote:
> On Fri, Oct 11, 2019 at 12:54:33AM +0200, Florian Westphal wrote:
>> Edward Cree <> wrote:
>>> On 10/10/2019 23:30, Florian Westphal wrote:
>>>> NF_HOOK_LIST now only works for ipv4 and ipv6, as those are the only
>>>> callers.
>>> ...
>>>> +
>>>> +     rcu_read_lock();
>>>> +     switch (pf) {
>>>> +     case NFPROTO_IPV4:
>>>> +             hook_head = rcu_dereference(net->nf.hooks_ipv4[hook]);
>>>> +             break;
>>>> +     case NFPROTO_IPV6:
>>>> +             hook_head = rcu_dereference(net->nf.hooks_ipv6[hook]);
>>>> +             break;
>>>> +     default:
>>>> +             WARN_ON_ONCE(1);
>>>> +             break;
>>>>       }
>>> Would it not make sense instead to abstract out the switch in nf_hook()
>>>  into, say, an inline function that could be called from here?  That
>>>  would satisfy SPOT and also save updating this code if new callers of
>>>  NF_HOOK_LIST are added in the future.
>> Its a matter of taste I guess.  I don't really like having all these
>> inline wrappers for wrappers wrapped in wrappers.
>> Pablo, its up to you.  I could add __nf_hook_get_hook_head() or similar
>> and use that instead of open-coding.
> I'm fine with your approach, Florian. If new callers are added, this
> can be done later on.
Fine, in that case feel free to add my
Acked-by: Edward Cree <>
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Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-10 22:30 Florian Westphal
2019-10-10 22:41 ` Edward Cree
2019-10-10 22:54   ` Florian Westphal
2019-10-14 11:02     ` Pablo Neira Ayuso
2019-10-14 13:56       ` Edward Cree [this message]
2019-10-17 10:20 ` Pablo Neira Ayuso

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