netdev - Re: [PATCH 2/2] ipvs: Extend MTU check to account for IPv6 NAT defrag changes

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Date:	Tue, 28 Aug 2012 10:22:05 +0200 (MEST)
From:	Patrick McHardy <kaber@...sh.net>
To:	Julian Anastasov <ja@....bg>
cc:	Jesper Dangaard Brouer <brouer@...hat.com>, netdev@...r.kernel.org,
	lvs-devel@...r.kernel.org, Simon Horman <horms@...ge.net.au>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Hans Schillstrom <hans@...illstrom.com>,
	Wensong Zhang <wensong@...ux-vs.org>,
	netfilter-devel@...r.kernel.org
Subject: Re: [PATCH 2/2] ipvs: Extend MTU check to account for IPv6 NAT defrag
 changes

On Mon, 27 Aug 2012, Julian Anastasov wrote:

>
> 	Hello,
>
> On Mon, 27 Aug 2012, Jesper Dangaard Brouer wrote:
>
>> This patch is necessary, to make IPVS work, after Patrick McHardys
>> IPv6 NAT defragmentation changes.
>>
>> Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
>> ---
>>
>> I would appriciate, if someone (e.g. Julian) double check the tunnel mode code.
>
> 	Sure
>
>> --Jesper
>>
>>  net/netfilter/ipvs/ip_vs_xmit.c |   16 +++++++++++++---
>>  1 files changed, 13 insertions(+), 3 deletions(-)
>>
>> @@ -956,8 +963,11 @@ ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
>>  		skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
>>
>>  	/* MTU checking: Special for tunnel mode */
>> -	if (mtu < ntohs(old_iph->payload_len) + sizeof(struct ipv6hdr) &&
>> -	    !skb_is_gso(skb)) {
>> +	if ((!IP6CB(skb)->frag_max_size &&
>> +	     (mtu < ntohs(old_iph->payload_len) + sizeof(struct ipv6hdr) &&
>> +	      !skb_is_gso(skb)))
>> +	    || IP6CB(skb)->frag_max_size + sizeof(struct ipv6hdr) > mtu) {
>> +
>
> 	mtu is already reduced with the new outer header size,
> may be we can just call __mtu_check_toobig_v6 with mtu?
>
>>  		if (!skb->dev) {
>>  			struct net *net = dev_net(skb_dst(skb)->dev);
>
> 	All other changes in patch 1 and 2 look ok and
> I'll ack them next time.

I'd like to take the final patches through my nat-ipv6 tree in order
to avoid temporary regressions. Please let me know when they're ready
for applying.
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