Global and Interface commands for IPv6 Link local feature

Signed-off-by: Akhilesh Samineni <akhilesh.samineni@broadcom.com>

config/main.py

@@ -500,6 +500,21 @@ def set_interface_naming_mode(mode):
     f.close()
     click.echo("Please logout and log back in for changes take effect.")
 
+def get_intf_ipv6_link_local_mode(ctx, interface_name, table_name):
+    config_db = ctx.obj["config_db"]
+    intf = config_db.get_table(table_name)
+    if interface_name in intf:
+        if 'ipv6_use_link_local_only' in intf[interface_name]:
+            return intf[interface_name]['ipv6_use_link_local_only']
+        else:
+            return "disable"
+    else:
+        return ""
+
+def disable_intf_ipv6_mode(interface_name):
+    cmd = "sysctl -w net.ipv6.conf.{}.disable_ipv6=1".format(interface_name)
+    proc = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
+    proc.communicate()
 
 def _is_neighbor_ipaddress(config_db, ipaddress):
     """Returns True if a neighbor has the IP address <ipaddress>, False if not
@@ -2663,7 +2678,7 @@ def remove(ctx, interface_name, ip_addr):
             ctx.fail("'interface_name' is not valid. Valid names [Ethernet/PortChannel/Vlan/Loopback]")
         config_db.set_entry(table_name, (interface_name, ip_addr), None)
         interface_dependent = interface_ipaddr_dependent_on_interface(config_db, interface_name)
-        if len(interface_dependent) == 0 and is_interface_bind_to_vrf(config_db, interface_name) is False:
+        if len(interface_dependent) == 0 and is_interface_bind_to_vrf(config_db, interface_name) is False and get_intf_ipv6_link_local_mode(ctx, interface_name, table_name) != "enable":
             config_db.set_entry(table_name, interface_name, None)
 
         if multi_asic.is_multi_asic():
@@ -3008,6 +3023,11 @@ def bind(ctx, interface_name, vrf_name):
     for interface_del in interface_dependent:
         config_db.set_entry(table_name, interface_del, None)
     config_db.set_entry(table_name, interface_name, None)
+
+    ipv6LinkLocalMode = get_intf_ipv6_link_local_mode(ctx, interface_name, table_name)
+    if ipv6LinkLocalMode is not None and ipv6LinkLocalMode == "enable":
+        disable_intf_ipv6_mode(interface_name)
+
     # When config_db del entry and then add entry with same key, the DEL will lost.
     if ctx.obj['namespace'] is DEFAULT_NAMESPACE:
         state_db = SonicV2Connector(use_unix_socket_path=True)
@@ -3047,6 +3067,129 @@ def unbind(ctx, interface_name):
         config_db.set_entry(table_name, interface_del, None)
     config_db.set_entry(table_name, interface_name, None)
 
+    ipv6LinkLocalMode = get_intf_ipv6_link_local_mode(ctx, interface_name, table_name)
+    if ipv6LinkLocalMode is not None and ipv6LinkLocalMode == "enable":
+        disable_intf_ipv6_mode(interface_name)
+
+
+#
+# 'ipv6' subgroup ('config interface ipv6 ...')
+#
+
+@interface.group()
+@click.pass_context
+def ipv6(ctx):
+    """Enable or Disable IPv6 processing on interface"""
+    pass
+
+@ipv6.group('enable')
+def enable():
+    """Enable IPv6 processing on interface"""
+    pass
+
+@ipv6.group('disable')
+def disable():
+    """Disble IPv6 processing on interface"""
+    pass
+
+#
+# 'config interface ipv6 enable use-link-local-only <interface-name>'
+#
+
+@enable.command('use-link-local-only')
+@click.pass_context
+@click.argument('interface_name', metavar='<interface_name>', required=True)
+def enable_use_link_local_only(ctx, interface_name):
+    """Enable IPv6 link local address on interface"""
+    config_db = ctx.obj["config_db"]
+
+    if clicommon.get_interface_naming_mode() == "alias":
+        interface_name = interface_alias_to_name(config_db, interface_name)
+        if interface_name is None:
+            ctx.fail("'interface_name' is None!")
+
+    if interface_name.startswith("Ethernet"):
+        interface_type = "INTERFACE"
+    elif interface_name.startswith("PortChannel"):
+        interface_type = "PORTCHANNEL_INTERFACE"
+    elif interface_name.startswith("Vlan"):
+        interface_type = "VLAN_INTERFACE"
+    else:
+        ctx.fail("'interface_name' is not valid. Valid names [Ethernet/PortChannel/Vlan]")
+
+    if (interface_type == "INTERFACE" ) or (interface_type == "PORTCHANNEL_INTERFACE"):
+        if interface_name_is_valid(config_db, interface_name) is False:
+            ctx.fail("Interface name %s is invalid. Please enter a valid interface name!!" %(interface_name))
+
+    if (interface_type == "VLAN_INTERFACE"):
+        vlan = config_db.get_entry('VLAN', interface_name)
+        if len(vlan) == 0:
+            ctx.fail("Interface name %s is invalid. Please enter a valid interface name!!" %(interface_name))
+
+    portchannel_member_table = config_db.get_table('PORTCHANNEL_MEMBER')
+
+    if interface_is_in_portchannel(portchannel_member_table, interface_name):
+        ctx.fail("{} is configured as a member of portchannel. Cannot configure the IPv6 link local mode!"
+                .format(interface_name))
+
+    vlan_member_table = config_db.get_table('VLAN_MEMBER')
+
+    if interface_is_in_vlan(vlan_member_table, interface_name):
+        ctx.fail("{} is configured as a member of vlan. Cannot configure the IPv6 link local mode!"
+                .format(interface_name))
+
+    interface_dict = config_db.get_table(interface_type)
+    set_ipv6_link_local_only_on_interface(config_db, interface_dict, interface_type, interface_name, "enable")
+
+#
+# 'config interface ipv6 disable use-link-local-only <interface-name>'
+#
+
+@disable.command('use-link-local-only')
+@click.pass_context
+@click.argument('interface_name', metavar='<interface_name>', required=True)
+def disable_use_link_local_only(ctx, interface_name):
+    """Disable IPv6 link local address on interface"""
+    config_db = ctx.obj["config_db"]
+
+    if clicommon.get_interface_naming_mode() == "alias":
+        interface_name = interface_alias_to_name(config_db, interface_name)
+        if interface_name is None:
+            ctx.fail("'interface_name' is None!")
+
+    interface_type = ""
+    if interface_name.startswith("Ethernet"):
+        interface_type = "INTERFACE"
+    elif interface_name.startswith("PortChannel"):
+        interface_type = "PORTCHANNEL_INTERFACE"
+    elif interface_name.startswith("Vlan"):
+        interface_type = "VLAN_INTERFACE"
+    else:
+        ctx.fail("'interface_name' is not valid. Valid names [Ethernet/PortChannel/Vlan]")
+
+    if (interface_type == "INTERFACE" ) or (interface_type == "PORTCHANNEL_INTERFACE"):
+        if interface_name_is_valid(config_db, interface_name) is False:
+            ctx.fail("Interface name %s is invalid. Please enter a valid interface name!!" %(interface_name))
+
+    if (interface_type == "VLAN_INTERFACE"):
+        vlan = config_db.get_entry('VLAN', interface_name)
+        if len(vlan) == 0:
+            ctx.fail("Interface name %s is invalid. Please enter a valid interface name!!" %(interface_name))
+
+    portchannel_member_table = config_db.get_table('PORTCHANNEL_MEMBER')
+
+    if interface_is_in_portchannel(portchannel_member_table, interface_name):
+        ctx.fail("{} is configured as a member of portchannel. Cannot configure the IPv6 link local mode!"
+                .format(interface_name))
+
+    vlan_member_table = config_db.get_table('VLAN_MEMBER')
+    if interface_is_in_vlan(vlan_member_table, interface_name):
+        ctx.fail("{} is configured as a member of vlan. Cannot configure the IPv6 link local mode!"
+                .format(interface_name))
+
+    interface_dict = config_db.get_table(interface_type)
+    set_ipv6_link_local_only_on_interface(config_db, interface_dict, interface_type, interface_name, "disable")
+
 
 #
 # 'vrf' group ('config vrf ...')
@@ -4414,6 +4557,108 @@ def delete(ctx):
     config_db.set_entry('SFLOW', 'global', sflow_tbl['global'])
 
 
+#
+# set ipv6 link local mode on a given interface
+#
+def set_ipv6_link_local_only_on_interface(config_db, interface_dict, interface_type, interface_name, mode):
+
+    curr_mode = config_db.get_entry(interface_type, interface_name).get('ipv6_use_link_local_only')
+    if curr_mode is not None:
+        if curr_mode == mode:
+            return
+    else:
+        if mode == "disable":
+            return
+
+    if mode == "enable":
+        config_db.mod_entry(interface_type, interface_name, {"ipv6_use_link_local_only": mode})
+        return
+
+    # If we are disabling the ipv6 link local on an interface, and if no other interface
+    # attributes/ip addresses are configured on the interface, delete the interface from the interface table
+    exists = False
+    for key in interface_dict.keys():
+        if not isinstance(key, tuple):
+            if interface_name == key:
+                #Interface bound to non-default-vrf do not delete the entry
+                if 'vrf_name' in interface_dict[key]:
+                    if len(interface_dict[key]['vrf_name']) > 0:
+                        exists = True
+                        break
+            continue
+        if interface_name in key:
+            exists = True
+            break
+
+    if exists:
+        config_db.mod_entry(interface_type, interface_name, {"ipv6_use_link_local_only": mode})
+    else:
+        config_db.set_entry(interface_type, interface_name, None)
+
+#
+# 'ipv6' group ('config ipv6 ...')
+#
+
+@config.group()
+@click.pass_context
+def ipv6(ctx):
+    """IPv6 configuration"""
+
+#
+# 'enable' command ('config ipv6 enable ...')
+#
+@ipv6.command()
+@click.pass_context
+def enable(ctx):
+    """Enable IPv6 on all interfaces """
+    config_db = ConfigDBConnector()
+    config_db.connect()
+    vlan_member_table = config_db.get_table('VLAN_MEMBER')
+    portchannel_member_table = config_db.get_table('PORTCHANNEL_MEMBER')
+
+    mode = "enable"
+
+    # Enable ipv6 link local on VLANs
+    vlan_dict = config_db.get_table('VLAN')
+    for key in vlan_dict.keys():
+        set_ipv6_link_local_only_on_interface(config_db, vlan_dict, 'VLAN_INTERFACE', key, mode)
+
+    # Enable ipv6 link local on PortChannels
+    portchannel_dict = config_db.get_table('PORTCHANNEL')
+    for key in portchannel_dict.keys():
+        if interface_is_in_vlan(vlan_member_table, key):
+            continue
+        set_ipv6_link_local_only_on_interface(config_db, portchannel_dict, 'PORTCHANNEL_INTERFACE', key, mode)
+
+    port_dict = config_db.get_table('PORT')
+    for key in port_dict.keys():
+        if interface_is_in_portchannel(portchannel_member_table, key) or interface_is_in_vlan(vlan_member_table, key):
+            continue
+        set_ipv6_link_local_only_on_interface(config_db, port_dict, 'INTERFACE', key, mode)
+
+#
+# 'disable' command ('config ipv6 disable ...')
+#
+@ipv6.command()
+@click.pass_context
+def disable(ctx):
+    """Disable IPv6 on all interfaces """
+    config_db = ConfigDBConnector()
+    config_db.connect()
+
+    mode = "disable"
+
+    tables = ['INTERFACE', 'VLAN_INTERFACE', 'PORTCHANNEL_INTERFACE']
+
+    for table_type in tables:
+        table_dict = config_db.get_table(table_type)
+        if table_dict:
+            for key in table_dict.keys():
+                if isinstance(key, unicode) is False:
+                    continue
+                set_ipv6_link_local_only_on_interface(config_db, table_dict, table_type, key, mode)
+
+
 # Load plugins and register them
 helper = util_base.UtilHelper()
 for plugin in helper.load_plugins(plugins):