From mboxrd@z Thu Jan  1 00:00:00 1970
From: zhuyj <zyjzyj2000@gmail.com>
Subject: Re: How to identify 6to4 and 6in4 tunnels
Date: Tue, 28 Jan 2014 18:18:57 +0800
Message-ID: <52E78411.9040802@gmail.com>
References: <52E63779.5090101@gmail.com> <52E65817.1090904@6wind.com> <52E75D23.10909@gmail.com> <52E75EA5.4070102@gmail.com>
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To: nicolas.dichtel@6wind.com, "David S. Miller" <davem@davemloft.net>,
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	yoshfuji@linux-ipv6.org, kaber@trash.net,
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On 01/28/2014 03:39 PM, zhuyj wrote:
> On 01/28/2014 03:32 PM, zhuyj wrote:
>> On 01/27/2014 08:59 PM, Nicolas Dichtel wrote:
>>> Le 27/01/2014 11:39, zhuyj a =E9crit :
>>>> Hi, Maintainers
>>>>
>>>> In our scene, we will create the 6in4/6to4 tunnel firstly and need=
=20
>>>> to check the
>>>> tunnel type, secondly, we will configure the ip address on it. So,=
=20
>>>> Could we have
>>>> any way to get the actual tunnel for 6in4 and 6to4 from current=20
>>>> linux version?
>>>>
>>>> Both 6in4 and 6to4 have the same protocol =93IPPROTO_IPV6=94 in Li=
nux=20
>>>> kernel. The
>>>> only difference is the ip address on the tunnel. Can we distinguis=
h=20
>>>> them in
>>>> Linux kernel?
>>> Just check the prefix, like it is done in check_6rd().
>>>
>>>
>>> Regards,
>>> Nicolas
> Hi, Nicolas
> Thanks for your reply. Maybe I can configure 6to4 tunnel by the=20
> following commands:
>
>  ip tunnel add tun6to4 mode sit remote any local 1.202.252.122 ttl 64
>  ip link set dev tun6to4 up
>  ip -6 addr add 2002:01ca:fc7a::0012:0225:2122/128 dev tun6to4
>  ip -6 route add 2000::/3 via ::192.88.99.1 dev tun6to4 metric 1
>
> But the kernel can not identify the tunnel is 6to4 tunnel or 6in4=20
> tunnel immediately. After the packets travel through this tunnel, the=
=20
> kernel can identify the type of the tunnel by check_6rd.
>
> Is it right?
>
> Best Regards!
> Zhu Yanjun
>
>
Hi, David

I want to identify sit interface 6to4 or 6in4 with the following parame=
ters.

include/uapi/linux/if_tunnel.h
=2E..
struct ip_tunnel_parm {
         char                    name[IFNAMSIZ];
         int                     link;
         __be16                  i_flags;             <---------I want=20
to use this variable to identify the type of sit interface. Can I?
         __be16                  o_flags;
         __be32                  i_key;
         __be32                  o_key;
         struct iphdr            iph;
};
=2E..

Please comment on this ? Thanks a lot.

Best Regards!
Zhu Yanjun