netdev - Re: [PATCH] ip_fragment: fix subtracting PPPOE_SES

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Message-ID: <4C56E961.9070107@trash.net>
Date:	Mon, 02 Aug 2010 17:50:57 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Changli Gao <xiaosuo@...il.com>
CC:	"David S. Miller" <davem@...emloft.net>,
	Bart De Schuymer <bdschuym@...dora.be>,
	netdev@...r.kernel.org
Subject: Re: [PATCH] ip_fragment: fix subtracting PPPOE_SES_HLEN from mtu
 twice

On 01.08.2010 01:25, Changli Gao wrote:
> 6c79bf0f2440fd250c8fce8d9b82fcf03d4e8350 subtracts PPPOE_SES_HLEN from mtu at
> the front of ip_fragment(). So the later subtraction should be removed. The
> MTU of 802.1q is also 1500, so MTU should not be changed.

Bart, please review, thanks.

> Signed-off-by: Changli Gao <xiaosuo@...il.com>
> ----
>  net/ipv4/ip_output.c |    6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
> index 6652bd9..04b6989 100644
> --- a/net/ipv4/ip_output.c
> +++ b/net/ipv4/ip_output.c
> @@ -446,7 +446,7 @@ int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *))
>  	int ptr;
>  	struct net_device *dev;
>  	struct sk_buff *skb2;
> -	unsigned int mtu, hlen, left, len, ll_rs, pad;
> +	unsigned int mtu, hlen, left, len, ll_rs;
>  	int offset;
>  	__be16 not_last_frag;
>  	struct rtable *rt = skb_rtable(skb);
> @@ -585,9 +585,7 @@ slow_path:
>  	/* for bridged IP traffic encapsulated inside f.e. a vlan header,
>  	 * we need to make room for the encapsulating header
>  	 */
> -	pad = nf_bridge_pad(skb);
> -	ll_rs = LL_RESERVED_SPACE_EXTRA(rt->dst.dev, pad);
> -	mtu -= pad;
> +	ll_rs = LL_RESERVED_SPACE_EXTRA(rt->dst.dev, nf_bridge_pad(skb));
>  
>  	/*
>  	 *	Fragment the datagram.
> 

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