tests: net: virtual: Add unit tests for checking tunneling

Add tests to verify that IP tunneling works as expected.

Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>

tests/net/virtual/CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.13.1)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(vlan)
+
+target_include_directories(app PRIVATE ${ZEPHYR_BASE}/subsys/net/ip)
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

tests/net/virtual/Kconfig

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+# Private config options for virtual network interface test app
+
+# Copyright (c) 2021 Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+mainmenu "Virtual network interface test application"
+
+config NET_TEST_TUNNEL_PEER_ADDR
+	string "Remote IP address of the tunnel interface"
+	depends on NET_L2_IPIP
+	help
+	  The value depends on your network setup.
+
+config NET_TEST_TUNNEL_MY_ADDR
+	string "My address for tunnel interface"
+	depends on NET_L2_IPIP
+	help
+	  The value depends on your network setup.
+
+config NET_TEST_TUNNEL_NAME
+	string "Name of the tunnel interface"
+	depends on NET_L2_IPIP
+	help
+	  The value depends on your network setup.
+
+source "Kconfig.zephyr"

tests/net/virtual/prj.conf

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+CONFIG_NETWORKING=y
+CONFIG_NET_TEST=y
+CONFIG_NET_IPV6=y
+CONFIG_NET_UDP=y
+CONFIG_NET_TCP=y
+CONFIG_NET_IPV4=y
+
+CONFIG_NET_L2_ETHERNET=y
+CONFIG_NET_L2_DUMMY=y
+CONFIG_NET_L2_VIRTUAL=y
+CONFIG_NET_L2_VIRTUAL_MGMT=y
+CONFIG_NET_L2_IPIP=y
+
+CONFIG_NET_IF_MAX_IPV6_COUNT=8
+CONFIG_NET_IF_MAX_IPV4_COUNT=8
+
+# First tunneling interface will have these settings
+CONFIG_NET_TEST_TUNNEL_PEER_ADDR="192.0.2.2"
+#CONFIG_NET_TEST_TUNNEL_PEER_ADDR="2001:db8::2"
+
+# Use this for IPv6 over IPv4|6
+CONFIG_NET_TEST_TUNNEL_MY_ADDR="2001:db8:200::1"
+
+# Use this for IPv4 over IPv4|6
+#CONFIG_NET_TEST_TUNNEL_MY_ADDR="198.51.100.1"
+
+CONFIG_NET_L2_VIRTUAL_MAX_NAME_LEN=8
+
+CONFIG_NET_ARP=n
+CONFIG_NET_MAX_CONTEXTS=4
+CONFIG_NET_LOG=y
+CONFIG_ENTROPY_GENERATOR=y
+CONFIG_TEST_RANDOM_GENERATOR=y
+CONFIG_NET_IPV6_DAD=n
+CONFIG_NET_IPV6_MLD=n
+CONFIG_NET_PKT_TX_COUNT=15
+CONFIG_NET_PKT_RX_COUNT=15
+CONFIG_NET_BUF_RX_COUNT=15
+CONFIG_NET_BUF_TX_COUNT=15
+CONFIG_NET_IF_MAX_IPV6_COUNT=6
+CONFIG_NET_IF_UNICAST_IPV6_ADDR_COUNT=6
+CONFIG_NET_IPV6_ND=n
+CONFIG_ZTEST=y
+CONFIG_NET_CONFIG_SETTINGS=n
+CONFIG_NET_SHELL=n

tests/net/virtual/testcase.yaml

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+common:
+  depends_on: netif
+  min_ram: 32
+  tags: net tunnel virtual
+tests:
+  net.virtual.tunnel.ipip:
+    extra_configs:
+      - CONFIG_NET_TEST_TUNNEL_PEER_ADDR="192.0.2.2"
+      - CONFIG_NET_TEST_TUNNEL_MY_ADDR="198.51.100.1"
+      - CONFIG_NET_TEST_TUNNEL_NAME="ipip"
+  net.virtual.tunnel.ip6ip:
+    extra_configs:
+      - CONFIG_NET_TEST_TUNNEL_PEER_ADDR="192.0.2.2"
+      - CONFIG_NET_TEST_TUNNEL_MY_ADDR="2001:db8:200::1"
+      - CONFIG_NET_TEST_TUNNEL_NAME="ip6ip"
+  net.virtual.tunnel.ipip6:
+    extra_configs:
+      - CONFIG_NET_TEST_TUNNEL_PEER_ADDR="2001:db8::2"
+      - CONFIG_NET_TEST_TUNNEL_MY_ADDR="198.51.100.1"
+      - CONFIG_NET_TEST_TUNNEL_NAME="ipip6"
+  net.virtual.tunnel.ip6ip6:
+    extra_configs:
+      - CONFIG_NET_TEST_TUNNEL_PEER_ADDR="2001:db8::2"
+      - CONFIG_NET_TEST_TUNNEL_MY_ADDR="2001:db8:200::1"
+      - CONFIG_NET_TEST_TUNNEL_NAME="ip6ip6"