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gluon-l3roamd: site: make node_client_prefix6 optional+deprecated

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The site.node_client_prefix6() is only used internally by the l3roamd
protocol. Therefore it is unnecessary to expose it to an administrator.

Instead, if node_client_prefix6 is unspecified in the site, generate an
IPv6 Unique Local Address prefix from the site domain_seed.

This updates the site documentation as well and marks this setting as
both optional and deprecated.

Note: If you had the node_client_prefix6 specified before and want to
use the new autogeneration from the domain_seed instead then this will
break compatibility and will need a gluon-scheduled-domain switch.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
This commit is contained in:
Linus Lüssing 2022-06-25 05:28:12 +02:00 committed by Jan-Niklas Burfeind
parent 7bf8de457a
commit b3a9221b07
8 changed files with 32 additions and 10 deletions
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11
docs/user/site.rst
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@ -49,10 +49,13 @@ node_prefix6
node_prefix6 = 'fdca::ffee:babe:2::/64'
node_client_prefix6
The ipv6 prefix from which the client-specific IP-address is calculated that
is assigned to each node by l3roamd to allow efficient communication when
roaming. This is exclusively useful when running a routing mesh protocol
node_client_prefix6 \: optional, deprecated
DEPRECATED: Don't specify it anymore, this prefix will then
automatically be generated from the domain_seed.
An IPv6 prefix internally used by the l3roamd protocol, used to allow
an efficient handover via unicast when a client roamed.
This is exclusively useful when running a routing mesh protocol
like babel. e.g. ::
node_client_prefix6 = 'fdca::ffee:babe:3::/64'

2
package/gluon-l3roamd/Makefile
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@ -6,7 +6,7 @@ include ../gluon.mk
define Package/gluon-l3roamd
TITLE:=Configure l3roamd for babel
DEPENDS:=+gluon-core +l3roamd +uc
DEPENDS:=+gluon-core +gluon-mesh-layer3-common +l3roamd +uc
endef
$(eval $(call BuildPackageGluon,gluon-l3roamd))

1
package/gluon-l3roamd/check_site.lua
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@ -1 +0,0 @@
need_string_match(in_domain({'node_client_prefix6'}), '^[%x:]+/64$', false)

2
package/gluon-l3roamd/files/etc/init.d/gluon-l3roamd
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@ -43,7 +43,7 @@ start_service () {
local prefix4="$(lua -e 'prefix4 = require("gluon.site").prefix4() if prefix4 then print(" -p " .. prefix4) end')"
local prefix6="$(lua -e 'print(" -p " .. require("gluon.site").prefix6())')"
local localip="$(uci get network.loopback.ip6addr | cut -d/ -f1)"
local roamingprefix="$(lua -e 'roamingprefix = require("gluon.site").node_client_prefix6() if roamingprefix then print(" -P " .. roamingprefix) end')"
local roamingprefix="$(lua -e 'print(" -P " .. require("gluon.l3").node_client_prefix6())')"
/sbin/sysctl -w net.ipv6.neigh.default.gc_thresh1=2
/sbin/sysctl -w net.ipv4.neigh.default.gc_thresh1=2

1
package/gluon-mesh-babel/check_site.lua
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@ -1,5 +1,4 @@
need_string_match(in_domain({'node_prefix6'}), '^[%x:]+/64$')
need_string_match(in_domain({'node_client_prefix6'}), '^[%x:]+/64$')
need_string_match(in_domain({'next_node', 'ip6'}), '^[%x:]+$', false)
need_string_match(in_domain({'next_node', 'ip4'}), '^%d+.%d+.%d+.%d+$', false)

3
package/gluon-mesh-babel/luasrc/lib/gluon/upgrade/300-gluon-mesh-babel-mkconfig
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@ -1,6 +1,7 @@
#!/usr/bin/lua
local site = require 'gluon.site'
local l3 = require 'gluon.l3'
local uci = require('simple-uci').cursor()
local nodeip = uci:get('network', 'loopback', 'ip6addr'):match('^[^/]+')
local babelconf='/etc/gluon-babeld.conf'
@ -14,7 +15,7 @@ file:write("import-table 254\n")
file:write("out ip " .. site.next_node.ip6() .. "/128 deny\n")
file:write("redistribute ip " .. site.next_node.ip6() .. "/128 deny\n")
file:write("redistribute ip " .. site.prefix6() .. " eq 128 allow\n")
file:write("redistribute ip " .. site.node_client_prefix6() .. " eq 128 allow\n")
file:write("redistribute ip " .. l3.node_client_prefix6() .. " eq 128 allow\n")
file:write("redistribute ip " .. site.node_prefix6() .. " eq 128 allow\n")
file:write("redistribute ip 2000::/3 allow\n")
file:write("redistribute local if br-wan deny\n")

2
package/gluon-mesh-layer3-common/check_site.lua
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@ -1,2 +1,2 @@
need_string_match(in_domain({'node_prefix6'}), '^[%x:]+/64$')
need_string_match(in_domain({'node_client_prefix6'}), '^[%x:]+/64$', false)

20
package/gluon-mesh-layer3-common/luasrc/usr/lib/lua/gluon/l3.lua Normal file
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@ -0,0 +1,20 @@
local site = require("gluon.site")
local util = require("gluon.util")
local M = {}
-- returns a prefix generated from the domain-seed
-- for l3roamd -P <node-client-prefix>
function M.node_client_prefix6()
local key = "gluon-l3roamd.node_client_prefix6"
local prefix = site.node_client_prefix6()
if not prefix then
local prefix_seed = util.domain_seed_bytes(key, 7)
prefix = ("fd" .. prefix_seed):gsub(("(%x%x%x%x)"):rep(4), "%1:%2:%3:%4" .. "::/64")
end
return prefix
end
return M