[sonic-buildimage] New feature managementVRF(L3mdev)

This commit adds support for New feature management VRF using L3mdev.  Added
commands to enable/disable management VRF. Config vrf add mgmt will enable
management VRF, enslave the eth0 device to the master device mgmt and restart
interfaces-configs in mgmt-vrf context.

management interface (eth0) can be configured using config interface eth0 ip
add command and removed using config interface eth0 ip remove command.

Requirement and design are covered in mgmt vrf design document.  Currently show
command displays linux command output; will update show command display in next
PR after concluding what would be the output for the show commands. Added
metric for default routes in dhcp and static, any changes for metric will be
addressed subsequently after discussing.

Signed-off-by: Harish Venkatraman <harish_venkatraman@dell.com>

build_debian.sh

@@ -205,6 +205,7 @@ sudo LANG=C chroot $FILESYSTEM_ROOT apt-get -y install      \
 ## Note: don't install python-apt by pip, older than Debian repo one
 sudo LANG=C DEBIAN_FRONTEND=noninteractive chroot $FILESYSTEM_ROOT apt-get -y install      \
     file                    \
+    ifmetric                \
     iproute2                \
     bridge-utils            \
     isc-dhcp-client         \

files/image_config/interfaces/interfaces.j2

@@ -5,6 +5,11 @@
 # file: /etc/network/interfaces
 #
 {% endblock banner %}
+{% if (MGMT_VRF_CONFIG) and (MGMT_VRF_CONFIG['vrf_global']['mgmtVrfEnabled'] == "true") %}
+auto mgmt
+iface mgmt
+    vrf-table 5000
+{% endif %}
 {% block loopback %}
 # The loopback network interface
 auto lo
@@ -26,25 +31,44 @@ auto eth0
 iface eth0 {{ 'inet' if prefix | ipv4 else 'inet6' }} static
     address {{ prefix | ip }}
     netmask {{ prefix | netmask if prefix | ipv4 else prefix | prefixlen }}
+{%     set vrf_table = 'default' %}
+{% if (MGMT_VRF_CONFIG) and (MGMT_VRF_CONFIG['vrf_global']['mgmtVrfEnabled'] == "true") %}
+{%     set vrf_table = '5000' %}
+    vrf mgmt
+{% endif %}
     ########## management network policy routing rules
     # management port up rules
-    up ip {{ '-4' if prefix | ipv4 else '-6' }} route add default via {{ MGMT_INTERFACE[(name, prefix)]['gwaddr'] }} dev eth0 table default
-    up ip {{ '-4' if prefix | ipv4 else '-6' }} route add {{ prefix | network }}/{{ prefix | prefixlen }} dev eth0 table default
-    up ip {{ '-4' if prefix | ipv4 else '-6' }} rule add from {{ prefix | ip }}/{{ '32' if prefix | ipv4 else '128' }} table default
+    up ip {{ '-4' if prefix | ipv4 else '-6' }} route add default via {{ MGMT_INTERFACE[(name, prefix)]['gwaddr'] }} dev eth0 table {{ vrf_table }} metric 201
+    up ip {{ '-4' if prefix | ipv4 else '-6' }} route add {{ prefix | network }}/{{ prefix | prefixlen }} dev eth0 table {{ vrf_table }}
+    up ip {{ '-4' if prefix | ipv4 else '-6' }} rule add from {{ prefix | ip }}/{{ '32' if prefix | ipv4 else '128' }} table {{ vrf_table }}
+{% if (MGMT_VRF_CONFIG) and (MGMT_VRF_CONFIG['vrf_global']['mgmtVrfEnabled'] == "true") %}
+    up cgcreate -g l3mdev:mgmt
+    up cgset -r l3mdev.master-device=mgmt mgmt
+{% endif %}
 {% for route in MGMT_INTERFACE[(name, prefix)]['forced_mgmt_routes'] %}
-    up ip rule add to {{ route }} table default
+    up ip rule add to {{ route }} table {{ vrf_table }}
 {% endfor %}
     # management port down rules
-    down ip {{ '-4' if prefix | ipv4 else '-6' }} route delete default via {{ MGMT_INTERFACE[(name, prefix)]['gwaddr'] }} dev eth0 table default
-    down ip {{ '-4' if prefix | ipv4 else '-6' }} route delete {{ prefix | network }}/{{ prefix | prefixlen }} dev eth0 table default
-    down ip {{ '-4' if prefix | ipv4 else '-6' }} rule delete from {{ prefix | ip }}/{{ '32' if prefix | ipv4 else '128' }} table default
+    down ip {{ '-4' if prefix | ipv4 else '-6' }} route delete default via {{ MGMT_INTERFACE[(name, prefix)]['gwaddr'] }} dev eth0 table {{ vrf_table }}
+    down ip {{ '-4' if prefix | ipv4 else '-6' }} route delete {{ prefix | network }}/{{ prefix | prefixlen }} dev eth0 table {{ vrf_table }}
+    down ip {{ '-4' if prefix | ipv4 else '-6' }} rule delete from {{ prefix | ip }}/{{ '32' if prefix | ipv4 else '128' }} table {{ vrf_table }}
+{% if (MGMT_VRF_CONFIG) and (MGMT_VRF_CONFIG['vrf_global']['mgmtVrfEnabled'] == "true") %}
+    down cgdelete -g l3mdev:mgmt
+{% endif %}
 {% for route in MGMT_INTERFACE[(name, prefix)]['forced_mgmt_routes'] %}
-    down ip rule delete to {{ route }} table default
+    down ip rule delete to {{ route }} table {{ vrf_table }}
 {% endfor %}
 {# TODO: COPP policy type rules #}
 {% endfor %}
 {% else %}
 iface eth0 inet dhcp
+    metric 202
+{% if (MGMT_VRF_CONFIG) and (MGMT_VRF_CONFIG['vrf_global']['mgmtVrfEnabled'] == "true") %}
+    vrf mgmt
+    up cgcreate -g l3mdev:mgmt
+    up cgset -r l3mdev.master-device=mgmt mgmt
+    down cgdelete -g l3mdev:mgmt
+{% endif %}
 {% endif %}
 #
 source /etc/network/interfaces.d/*

src/sonic-config-engine/tests/sample_output/interfaces

@@ -27,7 +27,7 @@ iface eth0 inet static
     netmask 255.255.255.0
     ########## management network policy routing rules
     # management port up rules
-    up ip -4 route add default via 10.0.0.1 dev eth0 table default
+    up ip -4 route add default via 10.0.0.1 dev eth0 table default metric 201
     up ip -4 route add 10.0.0.0/24 dev eth0 table default
     up ip -4 rule add from 10.0.0.100/32 table default
     # management port down rules
@@ -39,7 +39,7 @@ iface eth0 inet6 static
     netmask 64
     ########## management network policy routing rules
     # management port up rules
-    up ip -6 route add default via 2603:10e2:0:2902::1 dev eth0 table default
+    up ip -6 route add default via 2603:10e2:0:2902::1 dev eth0 table default metric 201
     up ip -6 route add 2603:10e2:0:2902::/64 dev eth0 table default
     up ip -6 rule add from 2603:10e2:0:2902::8/128 table default
     # management port down rules