lime-proto-wan add support for VLAN on WAN

[ilario]

I am using a LibreMesh router directly connected to an Optical Network Terminal.
My ONT communicates exclusively on VLAN 20 (type 802.1q), so the wan proto needs to support the wan:20 syntax, as already happens with the routing protocols (e.g. list protocols babeld:17).

With the routing protocols, the VLAN type defaults to 802.1ad, but here I think that the scenario I described is the predominant use case, and works with 802.1q. So I decided that the type defaults to 802.1q for lime-proto-wan.

In order to create a VLAN device without creating also the OpenWrt interface, I made a function network.createDevice copying the code from network.createMacvlanIface.
The main problem of having also the OpenWrt interface, is that OpenWrt's firewall would add wan_20 (wan with VLAN ID 20) to the LAN set of interfaces, allowing traffic to all ports.

[a-gave]

Amazing, thanks!

I just tested it and seems ok. I'm approving it. Feel free to merge it yourself when you consider it complete.

Tested on:

• OpenWrt One: running libremesh-master-ow24.10.5
• Cudy WR3000S v1: running libremesh-master-ow24.10.3 (b23a8f4 20250629_1619)

Details of tests:

A. on the Cudy (connected to the internet via 80211s):

1. Install luci via opkg
2. Go to http://10.13.0.1/cgi-bin/luci/admin/network/network and select the tab Devices
3. Select 'Add device configuration' and create a 'VLAN (802.1q)' network device,
   with 'Base Device: lan1'. Then 'Save' and 'Save and Apply'
4. From the Network/Devices tab select 'Configure' on the network device 'br-lan',
   then edit 'Bridge ports' deselecting 'lan1' and selecting 'lan1.20'. Then 'Save and Apply'

B. on the OpenWrt One:

1. Copied ilario's patch to the files /usr/lib/lua/lime/network.lua and /usr/lib/lua/lime/proto/wan.lua
2. Inserted the following content to 'lime-node':
   (to disable babeld, change wifi channels, change ipv4 to 10.14.x.x/16, change ap_ssid)

config lime 'system'

config lime network
	option main_ipv4_address '10.14.0.0/16'
	list protocols ieee80211s
	list protocols lan
	list protocols anygw
	list protocols batadv:%N1

config lime 'wifi'
	option ap_ssid 'test_LibreMesh.org'

config lime-wifi-band '2ghz'
	option channel '1'

config lime-wifi-band '5ghz'
	list channel '44'

config net lm_hwd_openwrt_wan                           # This interface gets created by lime-hwd-openwrt-wan package in case an ethernet WAN port is detected
    option autogenerated 'false'                        # Specify that the configuration of the WAN ethernet port has been manually edited, 
        
config net port0
    option linux_name 'eth0'
    list protocols 'wan:20:8021q' 

3. Run 'lime-config; reboot'

Then I connected via cable the Cudy lan1 port to the OpenWrt One's wan port and the latter reach the internet successfully.

I'd maybe repeat in lime-docs the section to disable the autogeneration of lime-hwd-openwrt-wan, because I tend to forget it

config net lm_hwd_openwrt_wan                           # This interface gets created by lime-hwd-openwrt-wan package in case an ethernet WAN port is detected
    option autogenerated 'false'                        # Specify that the configuration of the WAN ethernet port has been manually edited, 

Near the section ## configure the ethernet port eth1.5 as WAN with static ipv4 and ipv6 addresses
Because is required if you are inserting a manual configuration through the default wan port.

[ilario]

I changed the section name and added the configuration option there, it works for me, so I merge. Thanks for the testing!!!