Messages in this thread | | | Date | Thu, 23 Jan 2014 16:54:48 +0800 | From | zhuyj <> | Subject | Re: How to identify different ip tunnels |
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The version of the kernel is 3.4.43.
Any reply is appreciated.
Best Regards! Zhu Yanjun On 01/23/2014 03:33 PM, zhuyj wrote: > Hi, Maintainers > > We want to identify different ip tunnels. > > For example, we use “ip tunnel add xxx” command in linux to create an > ipv4/6 tunnel interface,then,we can receive a RTM_NEWLINK message from > linux for the new tunnel interface. > We will parse the struct ifinfomsg message and get the ifi->ifi_type > attribute. We need to do somethings depend on the tunnel type here. > I checked the linux source code and list all the tunnel types here: > > #define ARPHRD_TUNNEL 768 /* IPIP tunnel */ > #define ARPHRD_TUNNEL6 769 /* IP6IP6 tunnel */ > #define ARPHRD_SIT 776 /* sit0 device - IPv6-in-IPv4 */ > #define ARPHRD_IPGRE 778 /* GRE over IP */ > > It means that the linux will report the new link for any ipv4/6 tunnel > interface with type only within these four types. However, We need > more tunnel types for ipv4/6 tunnel. > For example, 4IN4/6IN4/6TO4/GRE/ISATAP for ipv4 tunnel and > 4IN6/6IN6/IPIN6 for ipv6 tunnel. > > Here are the result that we have got: > > Actual Tunnel type ifi->ifi_type > 4IN4 768 > GRE4 778 > 6IN4/6TO4/ISATAP 776 > 4IN6/6IN6/IPIN6 769 > > So, we can NOT distinguish the actual tunnel type via ifi_type > attribute except the GRE4 and 4IN4 tunnel. However we need the actual > type. That is our question. > > BTW, for the 6IN4 and 6TO4 tunnel, Can we distinguish them before the > interface ip address configured? Because we need to do different > things for them when we received the new link message and the tunnel > has NOT any ip address in this time. > > Best Regards! > Zhu Yanjun >
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