netdev - Re: [PATCH] ipv6: Don't unset flowi6_proto in ipxip6_tnl

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Date:   Thu, 1 Sep 2016 09:18:04 +0800
From:   Eli Cooper <elicooper@....com>
To:     David Miller <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, tom@...bertland.com
Subject: Re: [PATCH] ipv6: Don't unset flowi6_proto in ipxip6_tnl_xmit()

Hello,

On 2016/9/1 4:56, David Miller wrote:
> From: Eli Cooper <elicooper@....com>
> Date: Fri, 26 Aug 2016 23:52:29 +0800
>
>> @@ -1174,6 +1174,7 @@ ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
>>  		encap_limit = t->parms.encap_limit;
>>  
>>  	memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
>> +	fl6.flowi6_proto = IPPROTO_IPIP;
> Let's just simply have t->fl have the proto setup properly, just like
> in GRE.
>
> Assigning it explicitly every packet transmit doesn't make much sense.

I doubt that. Unlike GRE, where the proto must be IPPROTO_GRE, the proto
here can be either IPPROTO_IPV6 or IPPROTO_IPIP for a single tunnel, and
t->fl is shared by them. Thus it has to be assigned for every packet.

Thanks,
Eli