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

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Date:	Mon, 26 May 2014 12:38:45 +0800
From:	nickcave <nickcave.zhang@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	huizhang@...vell.com, netdev@...r.kernel.org,
	alan@...rguk.ukuu.org.uk
Subject: Re: [PATCH] net: ipv6: Fixed up ipsec packet be re-routing issue

2014-05-23 0:12 GMT+08:00 David Miller <davem@...emloft.net>:
> 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.

You are right,  __ip_local_out maybe a better place.I will submit another patch.
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