From 199058d11065c486f9f04e0d4ce63549b07a4962 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fabian=20Bl=C3=A4se?= <fabian@blaese.de>
Date: Wed, 14 Aug 2019 01:00:42 +0200
Subject: [PATCH] babeld: Automatically add redistribute filters
MIME-Version: 1.0
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babeld filters routes before announcing them with the
redistribute filters.

Users might add unknown public subnets to the client interface,
so redistribute filters have to be generated for these addresses.

Signed-off-by: Fabian Bläse <fabian@blaese.de>
Reviewed-by: Robert Langhammer <rlanghammer@web.de>
Tested-by: Fabian Bläse <fabian@blaese.de>
---
 .../fff-babeld/files/etc/gateway.d/40-babel   | 10 ++++++
 .../fff-babeld/files/lib/functions/fff/babel  | 33 +++++++++++++++++++
 2 files changed, 43 insertions(+)

diff --git a/src/packages/fff/fff-babeld/files/etc/gateway.d/40-babel b/src/packages/fff/fff-babeld/files/etc/gateway.d/40-babel
index 97f2c92f..c238cc16 100644
--- a/src/packages/fff/fff-babeld/files/etc/gateway.d/40-babel
+++ b/src/packages/fff/fff-babeld/files/etc/gateway.d/40-babel
@@ -80,6 +80,16 @@ configure() {
 
 	config_load gateway
 	config_foreach add_babelpeer babelpeer
+
+
+	# configure babeld filters for custom ipv6 addresses
+	## remove old filters
+	babel_remove_custom_redistribute_filters
+
+	## add new filters set for client interface in gatewayconfig
+	for prefix in $(uci -q get gateway.@client[0].ip6addr); do
+		babel_add_redistribute_filter "$prefix"
+	done
 }
 
 apply() {
diff --git a/src/packages/fff/fff-babeld/files/lib/functions/fff/babel b/src/packages/fff/fff-babeld/files/lib/functions/fff/babel
index 0d19cef5..5eb679b8 100644
--- a/src/packages/fff/fff-babeld/files/lib/functions/fff/babel
+++ b/src/packages/fff/fff-babeld/files/lib/functions/fff/babel
@@ -86,3 +86,36 @@ babel_delete_interface() {
 
 	return 0
 }
+
+babel_add_redistribute_filter() {
+	[ "$#" -ne "1" ] && return 1
+
+	local prefix="$1"
+
+	config=$(uci add babeld filter)
+	uci set babeld.$config.type='redistribute'
+	uci set babeld.$config.ip="$prefix"
+	uci set babeld.$config.addedbyautoconfig='true'
+
+	return 0
+}
+
+babel_remove_custom_redistribute_filters() {
+	[ "$#" -ne "0" ] && return 1
+
+	remove_filters() {
+		local name="$1"
+
+		# check if filter was added by configuregateway
+		if ! [ "$(uci -q get babeld.$name.addedbyautoconfig)" = 'true' ]; then
+			return
+		fi
+
+		uci -q del babeld.$name
+	}
+
+	config_load babeld
+	config_foreach remove_filters filter
+
+	return 0
+}