netdev - Re: [PATCH net v2 2/3] net/sched: act_ipt: add sanity checks on skb before calling target

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Message-ID: <CAKa-r6uyObXeAUTj28=f+V8BvrUQpXGP12JHRikct3SB=x48GA@mail.gmail.com>
Date: Thu, 8 Jun 2023 17:04:57 +0200
From: Davide Caratti <dcaratti@...hat.com>
To: Florian Westphal <fw@...len.de>
Cc: netdev@...r.kernel.org, kuba@...nel.org, edumazet@...gle.com, 
	davem@...emloft.net, pabeni@...hat.com, jhs@...atatu.com, 
	xiyou.wangcong@...il.com, jiri@...nulli.us, 
	Simon Horman <simon.horman@...igine.com>
Subject: Re: [PATCH net v2 2/3] net/sched: act_ipt: add sanity checks on skb
 before calling target

hello Florian,

On Thu, Jun 8, 2023 at 4:04 PM Florian Westphal <fw@...len.de> wrote:
>
> Netfilter targets make assumptions on the skb state, for example
> iphdr is supposed to be in the linear area.
>
[...]

> @@ -244,9 +264,22 @@ TC_INDIRECT_SCOPE int tcf_ipt_act(struct sk_buff *skb,
>                 .pf     = NFPROTO_IPV4,
>         };
>
> +       if (skb->protocol != htons(ETH_P_IP))
> +               return TC_ACT_UNSPEC;
> +

maybe this can be converted to skb_protocol(skb, ...)  so that it's
clear how VLAN packets are treated ?
thanks!
-- 
davide