Merge pull request #620 from jack9603301/T3030

tunnel: T3030: Add erspan protocol support

2 files changed, 116 insertions, 32 deletions

diff --git a/src/conf_mode/interfaces-erspan.py b/src/conf_mode/interfaces-erspan.py
new file mode 100755
index 000000000..2d65b834c
--- /dev/null
+++ b/src/conf_mode/interfaces-erspan.py
@@ -0,0 +1,114 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2018-2020 VyOS maintainers and contributors
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 or later as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+
+from sys import exit
+from copy import deepcopy
+from netifaces import interfaces
+
+from vyos.config import Config
+from vyos.configdict import dict_merge
+from vyos.configdict import get_interface_dict
+from vyos.configdict import node_changed
+from vyos.configdict import leaf_node_changed
+from vyos.configverify import verify_mtu_ipv6
+from vyos.configverify import verify_tunnel
+from vyos.ifconfig import Interface
+from vyos.ifconfig import ERSpanIf
+from vyos.ifconfig import ER6SpanIf
+from vyos.template import is_ipv4
+from vyos.template import is_ipv6
+from vyos.util import dict_search
+from vyos import ConfigError
+from vyos import airbag
+airbag.enable()
+
+def get_config(config=None):
+    """
+    Retrive CLI config as dictionary. Dictionary can never be empty, as at least
+    the interface name will be added or a deleted flag
+    """
+    if config:
+        conf = config
+    else:
+        conf = Config()
+    base = ['interfaces', 'erspan']
+    erspan = get_interface_dict(conf, base)
+    
+    tmp = leaf_node_changed(conf, ['encapsulation'])
+    if tmp:
+        erspan.update({'encapsulation_changed': {}})
+
+    return erspan
+
+def verify(erspan):
+    if 'deleted' in erspan:
+        return None
+    
+    if 'encapsulation' not in erspan:
+        raise ConfigError('Unable to detect the following ERSPAN tunnel encapsulation'\
+                          '{ifname}!'.format(**erspan))
+
+    verify_mtu_ipv6(erspan)
+    verify_tunnel(erspan)
+    
+    key = dict_search('parameters.ip.key',erspan)
+    if key == None:
+        raise ConfigError('parameters.ip.key is mandatory for ERSPAN tunnel')
+            
+
+def generate(erspan):
+    return None
+
+def apply(erspan):
+    if 'deleted' in erspan or 'encapsulation_changed' in erspan: 
+        if erspan['ifname'] in interfaces(): 
+            tmp = Interface(erspan['ifname']) 
+            tmp.remove() 
+        if 'deleted' in erspan: 
+            return None 
+    
+    dispatch = {
+        'erspan': ERSpanIf,
+        'ip6erspan': ER6SpanIf
+    }
+
+    # We need to re-map the tunnel encapsulation proto to a valid interface class
+    encap = erspan['encapsulation']
+    klass = dispatch[encap]
+    
+    conf = deepcopy(erspan)
+    
+    conf.update(klass.get_config())
+    
+    del conf['ifname']
+    
+    erspan_tunnel = klass(erspan['ifname'],**conf)
+    erspan_tunnel.change_options()
+    erspan_tunnel.update(erspan)
+
+    return None
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        generate(c)
+        verify(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)
diff --git a/src/conf_mode/interfaces-tunnel.py b/src/conf_mode/interfaces-tunnel.py
index f03bc9d5d..034bd6dd1 100755
--- a/src/conf_mode/interfaces-tunnel.py
+++ b/src/conf_mode/interfaces-tunnel.py
@@ -29,6 +29,7 @@ from vyos.configverify import verify_bridge_delete
 from vyos.configverify import verify_interface_exists
 from vyos.configverify import verify_mtu_ipv6
 from vyos.configverify import verify_vrf
+from vyos.configverify import verify_tunnel
 from vyos.ifconfig import Interface
 from vyos.ifconfig import GREIf
 from vyos.ifconfig import GRETapIf
@@ -84,38 +85,7 @@ def verify(tunnel):
     verify_mtu_ipv6(tunnel)
     verify_address(tunnel)
     verify_vrf(tunnel)
-
-    if 'local_ip' not in tunnel and 'dhcp_interface' not in tunnel:
-        raise ConfigError('local-ip is mandatory for tunnel')
-
-    if 'remote_ip' not in tunnel and tunnel['encapsulation'] != 'gre':
-        raise ConfigError('remote-ip is mandatory for tunnel')
-
-    if {'local_ip', 'dhcp_interface'} <= set(tunnel):
-        raise ConfigError('Can not use both local-ip and dhcp-interface')
-
-    if tunnel['encapsulation'] in ['ipip6', 'ip6ip6', 'ip6gre']:
-        error_ipv6 = 'Encapsulation mode requires IPv6'
-        if 'local_ip' in tunnel and not is_ipv6(tunnel['local_ip']):
-            raise ConfigError(f'{error_ipv6} local-ip')
-
-        if 'remote_ip' in tunnel and not is_ipv6(tunnel['remote_ip']):
-            raise ConfigError(f'{error_ipv6} remote-ip')
-    else:
-        error_ipv4 = 'Encapsulation mode requires IPv4'
-        if 'local_ip' in tunnel and not is_ipv4(tunnel['local_ip']):
-            raise ConfigError(f'{error_ipv4} local-ip')
-
-        if 'remote_ip' in tunnel and not is_ipv4(tunnel['remote_ip']):
-            raise ConfigError(f'{error_ipv4} remote-ip')
-
-    if tunnel['encapsulation'] in ['sit', 'gre-bridge']:
-        if 'source_interface' in tunnel:
-            raise ConfigError('Option source-interface can not be used with ' \
-                              'encapsulation "sit" or "gre-bridge"')
-    elif tunnel['encapsulation'] == 'gre':
-        if 'local_ip' in tunnel and is_ipv6(tunnel['local_ip']):
-            raise ConfigError('Can not use local IPv6 address is for mGRE tunnels')
+    verify_tunnel(tunnel)
 
     if 'source_interface' in tunnel:
         verify_interface_exists(tunnel['source_interface'])