netdev - Re: [PATCH nf-next] netfilter: add support for matching IPv4 options

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Date:   Sat, 1 Jun 2019 10:27:32 +0200
From:   Florian Westphal <fw@...len.de>
To:     Pablo Neira Ayuso <pablo@...filter.org>
Cc:     Stephen Suryaputra <ssuryaextr@...il.com>,
        netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH nf-next] netfilter: add support for matching IPv4 options

Pablo Neira Ayuso <pablo@...filter.org> wrote:
> > »       iph = skb_header_pointer(skb, *offset, sizeof(_iph), &_iph);
> > »       if (!iph || skb->protocol != htons(ETH_P_IP))
> > »       »       return -EBADMSG;
> 
> I mean, you make this check upfront from the _eval() path, ie.
> 
> static void nft_exthdr_ipv4_eval(const struct nft_expr *expr,
>                                  ...
> {
>         ...
> 
>         if (skb->protocol != htons(ETH_P_IP))
>                 goto err;

Wouldn't it be preferable to just use nft_pf() != NFPROTO_IPV4?