test-network: add testcase for router preference

test/test-network/conf/25-veth-bridge.network

@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+[Match]
+Name=client-p
+Name=router-high-p
+Name=router-low-p
+
+[Network]
+Bridge=bridge99
+IPv6AcceptRA=no
+IPv6SendRA=yes

test/test-network/conf/25-veth-client.netdev

@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+[NetDev]
+Name=client
+Kind=veth
+MACAddress=12:34:56:78:9a:00
+
+[Peer]
+Name=client-p
+MACAddress=12:34:56:78:9b:00

test/test-network/conf/25-veth-client.network

@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+[Match]
+Name=client
+
+[Network]
+IPv6AcceptRA=yes
+
+[IPv6AcceptRA]
+UseDNS=no
+UseDomains=no

test/test-network/conf/25-veth-router-high.netdev

@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+[NetDev]
+Name=router-high
+Kind=veth
+MACAddress=12:34:56:78:9a:99
+
+[Peer]
+Name=router-high-p
+MACAddress=12:34:56:78:9b:99

test/test-network/conf/25-veth-router-high.network

@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+[Match]
+Name=router-high
+
+[Network]
+IPv6AcceptRA=no
+IPv6SendRA=yes
+
+[IPv6SendRA]
+RouterPreference=high
+EmitDNS=no
+EmitDomains=no
+
+[IPv6Prefix]
+Prefix=2002:da8:1:99::/64
+PreferredLifetimeSec=1000s
+ValidLifetimeSec=2100s

test/test-network/conf/25-veth-router-low.netdev

@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+[NetDev]
+Name=router-low
+Kind=veth
+MACAddress=12:34:56:78:9a:98
+
+[Peer]
+Name=router-low-p
+MACAddress=12:34:56:78:9b:98

test/test-network/conf/25-veth-router-low.network

@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+[Match]
+Name=router-low
+
+[Network]
+IPv6AcceptRA=no
+IPv6SendRA=yes
+
+[IPv6SendRA]
+RouterPreference=low
+EmitDNS=no
+EmitDomains=no
+
+[IPv6Prefix]
+Prefix=2002:da8:1:98::/64
+PreferredLifetimeSec=1000s
+ValidLifetimeSec=2100s