Re: [PATCH v2 nf-next] netfilter: add and use nf_hook_slow_list()

[Edward Cree <ecree@solarflare.com>]

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.

(Sorry I didn't spot this the first time around; I don't know the NF
 code all that well.)

-Ed
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