linux-kernel - Re: [PATCH] net: fix bridge multicast packet checksum validation

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Message-Id: <20160218.153542.67284853154438064.davem@davemloft.net>
Date:	Thu, 18 Feb 2016 15:35:42 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	linus.luessing@...3.blue
Cc:	netdev@...r.kernel.org, stephen@...workplumber.org,
	bridge@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	sgunderson@...foot.com, noltari@...il.com, tom@...bertland.com
Subject: Re: [PATCH] net: fix bridge multicast packet checksum validation

From: Linus Lüssing <linus.luessing@...3.blue>
Date: Mon, 15 Feb 2016 03:07:06 +0100

> @@ -4084,10 +4089,22 @@ struct sk_buff *skb_checksum_trimmed(struct sk_buff *skb,
>  	if (!pskb_may_pull(skb_chk, offset))
>  		goto err;
>  
> -	__skb_pull(skb_chk, offset);
> +	ip_summed = skb->ip_summed;
> +	csum_valid = skb->csum_valid;
> +	csum_level = skb->csum_level;
> +	csum_bad = skb->csum_bad;
> +	csum = skb->csum;
> +
> +	skb_pull_rcsum(skb_chk, offset);
>  	ret = skb_chkf(skb_chk);
>  	__skb_push(skb_chk, offset);
>  
> +	skb->ip_summed = ip_summed;
> +	skb->csum_valid = csum_valid;
> +	skb->csum_level = csum_level;
> +	skb->csum_bad = csum_bad;
> +	skb->csum = csum;
> +

There really has to be a better way to fix this :-/