netdev - Re: [PATCH v2 net-next 2/2] sit: add support of x-netns

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Message-Id: <20130625.165612.1653110297729408070.davem@davemloft.net>
Date:	Tue, 25 Jun 2013 16:56:12 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	nicolas.dichtel@...nd.com
Cc:	netdev@...r.kernel.org, ebiederm@...ssion.com, bcrl@...ck.org,
	ravi.mlists@...il.com, bhutchings@...arflare.com
Subject: Re: [PATCH v2 net-next 2/2] sit: add support of x-netns

From: Nicolas Dichtel <nicolas.dichtel@...nd.com>
Date: Tue, 25 Jun 2013 16:24:55 +0200

> @@ -453,6 +454,8 @@ int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
>  	tstats->rx_bytes += skb->len;
>  	u64_stats_update_end(&tstats->syncp);
>  
> +	skb_scrub_packet(skb);
> +
>  	if (tunnel->dev->type == ARPHRD_ETHER) {
>  		skb->protocol = eth_type_trans(skb, tunnel->dev);
>  		skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);

I can't see how this can be ok.

If something in netfilter depends upon the state you are clearing out
here, someone's packet filtering setup is going to break.

I'm not applying these patches, sorry.
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