[ovs-discuss] [SFC NSH] Update "eth_dst" for original packet after decap nsh encapsulation packet.

[wang junqiang]

Hi,
    I also encountered this problem, need to change the source code to solve.

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________________________________
发件人: ovs-discuss-bounces at openvswitch.org 代表 Hoàng Công Phước <hoangphuocbk2.07 at gmail.com>
发送时间: 星期六, 一月 12, 2019 11:11
收件人: Ben Pfaff
抄送: bugs at openvswitch.org
主题: Re: [ovs-discuss] [SFC NSH] Update "eth_dst" for original packet after decap nsh encapsulation packet.

here are the document I am following:
https://github.com/openvswitch/ovs/blob/master/tests/nsh.at#L65-L68
My ovs version is 2.9.0 and when I check ovs, in version 2.9.0, NSH is supported.


Vào Th 7, 12 thg 1, 2019 vào lúc 01:52 Ben Pfaff <blp at ovn.org<mailto:blp at ovn.org>> đã viết:
I don't think OVS supports this kind of encapsulation.

On Fri, Jan 11, 2019 at 10:42:10AM +0900, Hoàng Công Phước wrote:
> Hi Ben, thank for your
>
> I am sorry because I didn't show the encapsulation command. In this case,
> original packet is encapsulated 2 times, with nsh and ethernet headers.
> Here is the flow:
>
> table=0, n_packets=0, n_bytes=0,
> priority=30,tcp,in_port="tap09d8de0e-20",nw_src=10.10.0.111,nw_dst=
> 10.10.0.0/24,tp_dst=80<http://10.10.0.0/24,tp_dst=80>
> actions=encap(nsh),set_field:0x33->nsh_spi,set_field:255->nsh_si,encap(ethernet),set_field:fa:16:3e:05:3a:12->eth_dst,resubmit(,5)
>
> As I known, after using decap() 2 times, I can get the original packet. So,
> I can update eth_dst to it.
>
>
>
>
>
> Vào Th 6, 11 thg 1, 2019 vào lúc 04:32 Ben Pfaff <blp at ovn.org<mailto:blp at ovn.org>> đã viết:
>
> > On Fri, Jan 11, 2019 at 04:26:03AM +0900, Hoàng Công Phước wrote:
> > > Hi experts,
> > >
> > > I am trying to update "eth_dst" for original packet after decap nsh
> > > encapsulation packet. Here is my command about it:
> > >
> > > $ sudo ovs-ofctl add-flow br-int "table=10, priority=1, dl_vlan=4,
> > > dl_dst=fa:16:3e:05:3a:12, dl_type=0x894f, nsh_mdtype=1, nsh_spi=0x33,
> > > nsh_si=254, actions=strip_vlan,
> > > move:NXM_OF_ETH_DST->OXM_OF_PKT_REG0[0..47], decap(), decap(),
> > > move:OXM_OF_PKT_REG0[0..47]->NXM_OF_ETH_DST, output:tap62c2fc56-14"
> > >
> > > However, I got an error, that is:
> > > "2019-01-10T19:11:27Z|00001|meta_flow|WARN|destination field eth_dst
> > lacks
> > > correct prerequisites
> > > ovs-ofctl: actions are invalid with specified match
> > > (OFPBAC_MATCH_INCONSISTENT)"
> > >
> > > If I remove "move:NXM_OF_ETH_DST->OXM_OF_PKT_REG0[0..47]" and
> > > "move:OXM_OF_PKT_REG0[0..47]->NXM_OF_ETH_DST", it worked. So there is an
> > > error with copy eth_dst value from outer to inner packet. I am beginner
> > > with Open vSwitch, so it's very helpful if someone can help me to figure
> > > the problem out.
> >
> > It looks to me that the first decap removes the NSH header and the
> > second decap removes the Ethernet header.  At that point, there's no
> > Ethernet destination field to set, so the error seems reasonable.
> >
>
>
> --
> Hoàng Công Phước


--
Hoàng Công Phước
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