Add ffbs-parker-nextnode

ffbs-parker-nextnode/Makefile

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+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=ffbs-parker-nextnode
+PKG_VERSION:=1
+
+PKG_MAINTAINER:=Chris Fiege <chris@tinyhost.de>
+PKG_LICENSE:=MIT
+
+include $(TOPDIR)/../package/gluon.mk
+
+define Package/ffbs-parker-nextnode
+  TITLE:=gluon-nextnode config for parker
+endef
+
+define Package/ffbs-parker-nextnode/description
+	This package adds ebtables rules for the parker nextnode range.
+	This package is needed when the nextnode-ips are outside of the
+	local net of the router - what is usually the case for parker networks.
+endef
+
+$(eval $(call BuildPackageGluon,ffbs-parker-nextnode))
+

ffbs-parker-nextnode/README.md

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+ffbs-parker-nextnode
+====================
+
+This is a package of [gluon-parker](https://github.com/ffbs/gluon-parker),
+a Gluon fork that uses routing between the nodes
+(aka. Router devices) and the infrastructure.
+It is currently in use at Freifunk Braunschweig.
+Other communities are interested in adopting it as well.
+
+This package provides `ebtables`-rules that redirect traffic to the
+`localnode` IPs on the node itself.
+
+This is needed in networks where the `localnode` addresses are outside the client network - for example when 
+using with `parker`.
+
+In Freifunk Braunschweig, for example, the `localnode` address is `2001:bf7:382:0::1`.
+But the IP addresses of routers and clients are in `2001:bf7:381::`.
+With this rule traffic to the `localnode` address is always forwarded to the router.
+
+(The service on the router should redirect the client to one of routers public addresses - otherwise the TCP connection
+would break when the client roams to another node with the same redirect.)
+
+site.conf
+---------
+
+Your `site.conf` probably already contains a `next_node` section, as
+requested by the [documentation](https://gluon.readthedocs.io/en/latest/user/site.html).
+
+For Freifunk Braunschweig this section look like this:
+
+```json
+next_node = {
+        ip4 = "172.16.127.1",
+        ip6 = "2001:bf7:382:0::1",
+        name = { "node.ffbs" },
+        mac = "72:02:46:6a:1c:27",
+},
+```

ffbs-parker-nextnode/files/lib/gluon/ebtables/399-localnode

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+local client_bridge = require 'gluon.client_bridge'
+local site = require 'gluon.site'
+local next_node = site.next_node({})
+local macaddr = client_bridge.next_node_macaddr()
+
+if next_node.ip4 then
+        rule('PREROUTING -p IPv4 -d ! ' .. macaddr .. ' --ip-dst ' .. site.next_node.ip4() .. ' -j dnat --to-dst ' .. macaddr .. ' --dnat-target ACCEPT', 'nat')
+end
+
+if next_node.ip6 then
+	rule('PREROUTING -p IPv6 -d ! ' .. macaddr .. ' --ip6-dst ' .. site.next_node.ip6() .. ' -j dnat --to-dst ' .. macaddr .. ' --dnat-target ACCEPT', 'nat')
+end