Re: [mpls-linux-devel] About mpls-packet to ip-packet process
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Re: [mpls-linux-devel] About mpls-packet to ip-packet process
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From: James R. L. <jl...@mi...> - 2008-05-05 02:00:12
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See my response in-line.
On Sun, May 04, 2008 at 03:37:28AM +0000, =?GB2312?B?wfXA2iA8b3JwaGVuX2xlaWxpdUBtc24uY29tPg==?= wrote:
>
> Thank you first.
> I was follow the example "IPv4 over MPLS: two LER example for mpls-linux-1.95x".
> And had follow config.
I understand that you are using a canned example. I'm telling you that
for what you want to do, you cannot use a canned example. You will have
to deviate from the example.
> ________________________________________________________________________________________________
> 172.16.0.0/24
> 10.0.0.1/32 | 10.0.0.2/32
> dummy0 | dummy0
> | | |
> -----------eth1 eth1------eth2 v eth2------eth3 eth3--------
> | HOST A |------------| LER1 |--------------------------| LER2 |---------| HOST B |
> -----------.1 ^ 2------.2 3------.3 ^ 4-----------
> | |
> | |
> 192.168.0.0/24 192.168.1.0/24
> __________________________________________________________________________________________________
> HOST A
> ------
> ip route add 10.0.0.2/32 via 192.168.0.2 src 10.0.0.1
>
> LER1
> -----
> mpls nhlfe add key 0 instructions push gen 1000 nexthop eth2 ipv4 172.16.0.3
> (returns key 0x2)
> ip route add 10.0.0.2/32 via 172.16.0.3 mpls 0x2
> echo 1> /proc/sys/net/ipv4/ip_forward
> mpls labelspace set dev eth2 labelspace 0
> mpls ilm add label gen 2000 labelspace 0
> mpls nhlfe add key 0 instructions nexthop eth1 ipv4 192.168.0.1
> (returns key 0x3)
> mpls xc add ilm_label gen 2000 ilm_labelspace 0 nhlfe_key 0x3
>
> LER2
> -----
> mpls labelspace set dev eth2 labelspace 0
> mpls ilm add label gen 1000 labelspace 0 <-------------------Had set this
> mpls nhlfe add key 0 instructions nexthop eth3 ipv4 192.168.1.4
> (returns key 0x2)
> mpls xc add ilm_label gen 1000 ilm_labelspace 0 nhlfe_key 0x2
> mpls nhlfe add key 0 instructions push gen 2000 nexthop eth2 ipv4 172.16.0.2
> (returns key 0x3)
> ip route add 10.0.0.1/32 via 172.16.0.2 mpls 0x3
> echo 1> /proc/sys/net/ipv4/ip_forward
>
> HOST B
> ------
> ip route add 10.0.0.1/32 via 192.168.1.3 src 10.0.0.2
> _________________________________________________________________________________________________________________
> BUT, the packet from HOST A to HOST B does not through the IP stack on LER2.
>
> Is't my config error?
>
> And another problem for quagga, that the patch file quagga-mpls.diff can not patch to quagga-0.99.9 (latest unstable release) or quagga-0.98.6 (latest stable release).
> Do you have the new patch file?
I know it does not apply. I do not have a new patch ready. If you
would to look at the recent developments in quagga-mpls, you will need to
pull it from my development tree.
> Thank you for help.
> ----------------------------------------
> > Date: Thu, 1 May 2008 12:35:52 -0500
> > From: jl...@mi...
> > To: @mindspring.com
> > CC: mpl...@li...
> > Subject: Re: [mpls-linux-devel] About mpls-packet to ip-packet process
> >
> > On Thu, May 01, 2008 at 03:55:33PM +0000, =?GB2312?B?wfXA2iA8b3JwaGVuX2xlaWxpdUBtc24uY29tPg==?= wrote:
> >>
> >> I'm sorry for my poor english.
> >> Just like the follow instance.
> >>
> >> < Client Router>-------| LER |--------{ MPLS NETWORK }
> >>
> >> The packet from Client got into MPLS NETWORK, will through 'ip_rcv, ip_rcv_finish (ip_route_input ip_route_input_slow ip_mkroute_input __mkroute_input rt_set_nexthop mpls_set_nexthop mpl_set_nexthop2) ip_forward ip_forward_finish ip_output ip_finish_output ip_finish_output2 mpls_output mpls_output_shim mpls_output2 mpls_send'. Am I right?
> >> And the packet from MPLS NETWORK to client, will through 'mpls_skb_recv mpls_input mpls_switch mpls_output2 mpls_send neighbour->output'.
> >> If I want to the packet out from mpls_send got into ip_rcv ......, how to config it?
> >> "mpls nhlfe add key 0 instruction pop nexthop ethX ipv4 (Client Router's IP)"? Right?
> >
> > This is a PHP config, IE no IPv4 route lookup is being done on the LER
> > when the packet goes from MPLS to IPv4.
> >
> > For the packet to go through the IPv4 stack you will want your
> > ILM to be something like:
> >
> > mpls ilm add label gen 200 labelspace 0
> >
> > That is it. The default instruction on a ILM are "pop peek".
> > Which results in mpls_input() returning MPLS_RESULT_DLV which
> > ends up with the packet being handle via the IPv4 protocol driver's
> > (net/ipv4/mpls4.c) local_deliver function.
> >
> >> ----------------------------------------
> >>> Date: Thu, 1 May 2008 06:45:41 -0500
> >>> From: jl...@mi...
> >>> To: @mindspring.com
> >>> CC: mpl...@li...
> >>> Subject: Re: [mpls-linux-devel] About mpls-packet to ip-packet process
> >>>
> >>> Just to make sure I understand what you're trying to do:
> >>>
> >>> You want to get hooked into the PREROUTE netfilter chain for packets
> >>> coming to a LER from MPLS. To do this the normal 'pop peek' instructions
> >>> should work just. If you want to 'force' the trasistion from MPLS to
> >>> IPv4 for packets coming to a LER from MPLS you can use the 'deliver'
> >>> instruction on the associated ILM.
> >>>
> >>> On Thu, May 01, 2008 at 10:44:42AM +0000, =?GB2312?B?wfXA2iA8b3JwaGVuX2xlaWxpdUBtc24uY29tPg==?= wrote:
> >>>>
> >>>> I was follow the example of "IPv4 over MPLS: two LER example for mpls-linux-1.95x".
> >>>> Do you means I have to change the "mpls nhlfe add key 0 instructions nexthop eth3 ipv4 192.168.1.4
> >>>> (returns key 0x2)" to "mpls nhlfe add key 0 instructions deliver nexthop eth3 ipv4 192.168.1.4
> >>>> (returns key 0x2)" ?
> >>>>
> >>>> ----------------------------------------
> >>>>> Date: Wed, 30 Apr 2008 21:16:22 -0500
> >>>>> From: jl...@mi...
> >>>>> To: @mindspring.com
> >>>>> CC: mpl...@li...
> >>>>> Subject: Re: [mpls-linux-devel] About mpls-packet to ip-packet process
> >>>>>
> >>>>> Hmm. I think you are looking at the PHP code. Take a look at
> >>>>> the 'deliver' instruction. It will show you that packets destined from
> >>>>> IPv4 may be configured to go through 'ip_rcv' which will result in
> >>>>> the packet travesing all of the IPv4 netfilter hooks.
> >>>>>
> >>>>> On Wed, Apr 30, 2008 at 03:56:51AM +0000, =?GB2312?B?wfXA2iA8b3JwaGVuX2xlaWxpdUBtc24uY29tPg==?= wrote:
> >>>>>>
> >>>>>> Hi all:
> >>>>>> I found that the packet which from ip stack to mpls stack in the ip_finish_output2 had passed POSTROUTING hook in netfilter.
> >>>>>> BUT the packet from mpls stack to ip stack just use neighbour->output, which NOT hook in PREROUTING in netfilter.
> >>>>>>
> >>>>>> In this way, if I do SNAT for ip packet and send into mpls stack, will NOT do Un-SNAT for the reply packet.
> >>>>>>
> >>>>>> Is my understand right? How to solved it?
> >>>>>> _________________________________________________________________
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> >>>>>>
> >>>>>
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> >>>>>> _______________________________________________
> >>>>>> mpls-linux-devel mailing list
> >>>>>> mpl...@li...
> >>>>>> https://lists.sourceforge.net/lists/listinfo/mpls-linux-devel
> >>>>>
> >>>>>
> >>>>> --
> >>>>> James R. Leu
> >>>>> jl...@mi...
> >>>>
> >>>> _________________________________________________________________
> >>>> MSN 中文网，最新时尚生活资讯，白领聚集门户。
> >>>> http://cn.msn.com
> >>>
> >>> --
> >>> James R. Leu
> >>> jl...@mi...
> >>
> >> _________________________________________________________________
> >> MSN 中文网，最新时尚生活资讯，白领聚集门户。
> >> http://cn.msn.com
> >
> > --
> > James R. Leu
> > jl...@mi...
>
> _________________________________________________________________
> MSN 中文网，最新时尚生活资讯，白领聚集门户。
> http://cn.msn.com
--
James R. Leu
jl...@mi...
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