[Click] VLAN - ARP proposal

[Cliff Frey]

Hi Lars,

Here are elements that Meraki has used for this purpose.  If you find them
useful, we can likely commit them in to mainline click.

https://github.com/clifffrey/click/tree/vlan-elements

Cliff

On Thu, May 5, 2011 at 9:23 AM, Bro, Lars <lars.bro at siemens.com> wrote:

>
> Hi, list
>
> I am developing a test system that can send traffic through our product
> in different ways, and verify this traffic.
>
> Now, our product is going to use  802.1Q VLAN tagging as well.
>
> ---------
>
> I can see that there are already some elements available, so that one
> can for example annotate packets with a
> VLAN tag and then send the packets through EtherVlanEncap().
>
> But I use ARPQuerier() for assigning the ethernet address.
>
> One could make an element that - if the packet is an 802.1Q - removes
> the 802.1Q part and stores it
> in the VLAN annotation. - and the reverse - inserts the 802.1Q part
> according to the packet annotation.
>
> Such an element could be put just before ToDevice() - and if
> ARPRequester were changed slightly so that the VLAN
> annotation is also included in the ARP request, the ARP request would go
> to the correct VLAN.
>
> The example below shows what I mean, VLAN 2 and 7 and no VLAN:
>
> // Input is packets to send via eth3, with or without VLAN annotation
> // output is packets from eth3, with and without VLAN annotation
> // (I know that VLAN annotation contains PCP, CFI and VID, so the below
> is not right use of VLAN anno)
> // (PaintTee could use the lower byte of TCI, that gives at least 255
> possibilities)
> // (otherwise, one should make a real VlanClassifier)
> // (or even better, an ANNOClassifier())
> {
>
> AddressInfo (
>  eth3_untagged 192.168.17.12/24,
>  eth3_on_2 10.15.13.2/24,
>  eth3_on_3 10.16.19.22/24,
>  eth3 00-01-02-03-04-05
> );
>
> input -> out_untagged::PaintTee(0, VLAN) -> out_vlan2::PaintTee(2, VLAN)
> -> out_vlan7::PaintTee(7, VLAN) -> Discard;
>
> to_eth3 ::VLANEncap() -> ToDevice(eth3);
> queue_to_eth3::Queue() -> to_eth3;
>
> out_untagged -> arpq_untagged::ARPQuerier(eth3_untagged)  -> to_eth3
> out_wlan2 -> arpq_wlan2::ARPQuerier(eth3_on_2)  -> to_eth3;
> out_wlan7 -> arpq_wlan7::ARPQuerier(eth3_on_3). -> to_eth3;
>
> FromDevice(eth3) -> VLANDecap() ->
> in_untagged::PaintTee(0, VLAN) -> in_vlan2::PaintTee(2, VLAN) ->
> in_vlan7::PaintTee(7, VLAN) -> Discard
>
> in_untagged -> arp_untagged::Classifier(12/0806 20/0001, 12/0806 20/0002
> 12/0800);
> in_wlan2 -> arp_wlan2::Classifier(12/0806 20/0001, 12/0806 20/0002
> 12/0800);
> in_wlan7 -> arp_wlan7::Classifier(12/0806 20/0001, 12/0806 20/0002
> 12/0800);
>
> in_untagged[0] -> ARPResponder(eth3_untagged, eth3) -> queue_to_eth3;
> in_wlan2[0] -> ARPResponder(eth3_wlan2, eth3) -> queue_to_eth3;
> in_wlan7[0] -> ARPResponder(eth3_wlan7, eth3) -> queue_to_eth3;
>
> in_untagged[1] -> [1]arpq_untagged;
> in_wlan2[1] -> [1]arpq_wlan2;
> in_wlan7[1] -> [1]arpq_wlan7;
>
> in_untagged[2] -> output;
> in_wlan2[2] -> output;
> in_wlan7[2] -> output;
>
> }
>
>
> Would you say, this is a proper solution?
>
>
>
> I know that I could also do vconfig and create the VLAN subdevices, but
> then I mix Click with Linux stuff. I think implementing in Click is the
> cleanest way
>
> Med venlig hilsen / Kind regards
> Lars Bro
> Test Manager
>
> Siemens A/S
> Industry Sector
> Mobility Division
> Islands Brygge 55
> 2300  Copenhagen
> Denmark
> Tel: +45 3388-6219
> mailto:lars.bro at siemens.com
> www.siemens.dk
>
> Siemens A/S. Headquarters: Borupvang 3, 2750 Ballerup, Denmark. Tel: +45
> 4477 4477 CVR-no. 16 99 30 85
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