netdev - Re: [PATCH] net: ipv6: Fixed up ipsec packet be re-routing issue

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Date:	Thu, 22 May 2014 12:12:15 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	huizhang@...vell.com
Cc:	netdev@...r.kernel.org, alan@...rguk.ukuu.org.uk,
	nickcave.zhang@...il.com
Subject: Re: [PATCH] net: ipv6: Fixed up ipsec packet be re-routing issue

From: huizhang <huizhang@...vell.com>
Date: Thu, 22 May 2014 15:05:46 +0800

> diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
> index 5f8e128..869b68b 100644
> --- a/net/ipv6/xfrm6_policy.c
> +++ b/net/ipv6/xfrm6_policy.c
> @@ -134,6 +134,8 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
>  	const struct ipv6hdr *hdr = ipv6_hdr(skb);
>  	struct ipv6_opt_hdr *exthdr;
>  	const unsigned char *nh = skb_network_header(skb);
> +	if(IP6CB(skb)->nhoff==0)
> +		IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);
>  	u8 nexthdr = nh[IP6CB(skb)->nhoff];
>  	int oif = 0;

Never put actual statements in the middle of a series of variable
declarations.

Also, it would probably be better to do this assignment in
__ip_local_out().

That's the bug, we only set nhoff in the input paths, we need
to set it in the output paths too if reaching _decode_session6
is possible for output packets.
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