papi: allow unknown address family

In unions all representations of the union are decoded.
Which means trying to decode something that isn't an address
might have invalid address family types.

Type: fix
Ticket: VPP-1884
Signed-off-by: Ole Troan <ot@cisco.com>
Change-Id: Id3381ef8cc885952c1eb488ebc70e276eaceb366

2 files changed, 71 insertions, 10 deletions

diff --git a/src/vpp-api/python/vpp_papi/tests/test_vpp_serializer.py b/src/vpp-api/python/vpp_papi/tests/test_vpp_serializer.py
index 5d6993f91a7..317fea7269a 100755
--- a/src/vpp-api/python/vpp_papi/tests/test_vpp_serializer.py
+++ b/src/vpp-api/python/vpp_papi/tests/test_vpp_serializer.py
@@ -4,6 +4,7 @@ import unittest
 from vpp_papi.vpp_serializer import VPPType, VPPEnumType
 from vpp_papi.vpp_serializer import VPPUnionType, VPPMessage
 from vpp_papi.vpp_serializer import VPPTypeAlias, VPPSerializerValueError
+from vpp_papi import MACAddress
 from socket import inet_pton, AF_INET, AF_INET6
 import logging
 import sys
@@ -557,5 +558,56 @@ class TestAddType(unittest.TestCase):
         self.assertEqual(len(b), 20)
 
 
+    def test_lisp(self):
+        VPPEnumType('vl_api_eid_type_t',
+                    [["EID_TYPE_API_PREFIX", 0],
+                     ["EID_TYPE_API_MAC", 1],
+                     ["EID_TYPE_API_NSH", 2],
+                     {"enumtype": "u32"}])
+
+        VPPTypeAlias('vl_api_mac_address_t', {'type': 'u8',
+                                              'length': 6})
+
+        VPPType('vl_api_nsh_t',
+                [["u32", "spi"],
+                 ["u8", "si"]])
+
+        VPPEnumType('vl_api_address_family_t', [["ADDRESS_IP4", 0],
+                                                ["ADDRESS_IP6", 1],
+                                                {"enumtype": "u32"}])
+        VPPTypeAlias('vl_api_ip4_address_t', {'type': 'u8',
+                                              'length': 4})
+        VPPTypeAlias('vl_api_ip6_address_t', {'type': 'u8',
+                                              'length': 16})
+        VPPUnionType('vl_api_address_union_t',
+                     [["vl_api_ip4_address_t", "ip4"],
+                      ["vl_api_ip6_address_t", "ip6"]])
+
+        VPPType('vl_api_address_t',
+                [['vl_api_address_family_t', 'af'],
+                 ['vl_api_address_union_t', 'un']])
+
+        VPPType('vl_api_prefix_t',
+                [['vl_api_address_t', 'address'],
+                 ['u8', 'len']])
+
+        VPPUnionType('vl_api_eid_address_t',
+                     [["vl_api_prefix_t", "prefix"],
+                      ["vl_api_mac_address_t", "mac"],
+                      ["vl_api_nsh_t", "nsh"]])
+
+        eid = VPPType('vl_api_eid_t',
+                      [["vl_api_eid_type_t", "type"],
+                       ["vl_api_eid_address_t", "address"]])
+
+        b = eid.pack({'type':1,
+                      'address': {
+                          'mac': MACAddress('aa:bb:cc:dd:ee:ff')}})
+        self.assertEqual(len(b), 25)
+        nt, size = eid.unpack(b)
+        self.assertEqual(str(nt.address.mac), 'aa:bb:cc:dd:ee:ff')
+        self.assertIsNone(nt.address.prefix)
+
+
 if __name__ == '__main__':
     unittest.main()
diff --git a/src/vpp-api/python/vpp_papi/vpp_format.py b/src/vpp-api/python/vpp_papi/vpp_format.py
index 4c26463bbb5..261683d5816 100644
--- a/src/vpp-api/python/vpp_papi/vpp_format.py
+++ b/src/vpp-api/python/vpp_papi/vpp_format.py
@@ -57,6 +57,7 @@ def format_vl_api_prefix_t(args):
     return {'address': format_vl_api_address_t(p),
             'len': int(length)}
 
+
 def format_vl_api_address_with_prefix_t(args):
     if isinstance(args, (ipaddress.IPv4Interface, ipaddress.IPv6Interface)):
         return {'address': format_vl_api_address_t(
@@ -75,6 +76,7 @@ def format_vl_api_ip6_prefix_t(args):
     return {'address': inet_pton(AF_INET6, p),
             'len': int(length)}
 
+
 def format_vl_api_ip6_address_with_prefix_t(args):
     if isinstance(args, ipaddress.IPv6Interface):
         return {'address': args.network_address.packed,
@@ -83,6 +85,7 @@ def format_vl_api_ip6_address_with_prefix_t(args):
     return {'address': inet_pton(AF_INET6, p),
             'len': int(length)}
 
+
 def format_vl_api_ip4_prefix_t(args):
     if isinstance(args, ipaddress.IPv4Network):
         return {'address': args.network_address.packed,
@@ -91,6 +94,7 @@ def format_vl_api_ip4_prefix_t(args):
     return {'address': inet_pton(AF_INET, p),
             'len': int(length)}
 
+
 def format_vl_api_ip4_address_with_prefix_t(args):
     if isinstance(args, ipaddress.IPv4Interface):
         return {'address': args.network_address.packed,
@@ -144,13 +148,13 @@ conversion_table = {
     'vl_api_address_with_prefix_t':
     {
         'IPv4Interface': lambda o: {'address':
-                                  {'af': ADDRESS_IP4, 'un':
-                                   {'ip4': o.packed}},
-                                  'len': o.network.prefixlen},
+                                    {'af': ADDRESS_IP4, 'un':
+                                     {'ip4': o.packed}},
+                                    'len': o.network.prefixlen},
         'IPv6Interface': lambda o: {'address':
-                                  {'af': ADDRESS_IP6, 'un':
-                                   {'ip6': o.packed}},
-                                  'len': o.network.prefixlen},
+                                    {'af': ADDRESS_IP6, 'un':
+                                     {'ip6': o.packed}},
+                                    'len': o.network.prefixlen},
         'str': lambda s: format_vl_api_address_with_prefix_t(s)
     },
     'vl_api_ip4_address_with_prefix_t':
@@ -162,7 +166,7 @@ conversion_table = {
     'vl_api_ip6_address_with_prefix_t':
     {
         'IPv6Interface': lambda o: {'address': o.packed,
-                                  'len': o.network.prefixlen},
+                                    'len': o.network.prefixlen},
         'str': lambda s: format_vl_api_ip6_address_with_prefix_t(s)
     },
     'vl_api_mac_address_t':
@@ -183,14 +187,15 @@ def unformat_api_address_t(o):
         return ipaddress.IPv6Address(o.un.ip6)
     if o.af == 0:
         return ipaddress.IPv4Address(o.un.ip4)
-    raise ValueError('Unknown address family {}'.format(o))
+    return None
+
 
 def unformat_api_prefix_t(o):
     if o.address.af == 1:
         return ipaddress.IPv6Network((o.address.un.ip6, o.len), False)
     if o.address.af == 0:
         return ipaddress.IPv4Network((o.address.un.ip4, o.len), False)
-    raise ValueError('Unknown address family {}'.format(o))
+    return None
 
     if isinstance(o.address, ipaddress.IPv4Address):
         return ipaddress.IPv4Network((o.address, o.len), False)
@@ -198,19 +203,23 @@ def unformat_api_prefix_t(o):
         return ipaddress.IPv6Network((o.address, o.len), False)
     raise ValueError('Unknown instance {}', format(o))
 
+
 def unformat_api_address_with_prefix_t(o):
     if o.address.af == 1:
         return ipaddress.IPv6Interface((o.address.un.ip6, o.len))
     if o.address.af == 0:
         return ipaddress.IPv4Interface((o.address.un.ip4, o.len))
-    raise ValueError('Unknown address family {}'.format(o))
+    return None
+
 
 def unformat_api_ip4_address_with_prefix_t(o):
     return ipaddress.IPv4Interface((o.address, o.len))
 
+
 def unformat_api_ip6_address_with_prefix_t(o):
     return ipaddress.IPv6Interface((o.address, o.len))
 
+
 conversion_unpacker_table = {
     'vl_api_ip6_address_t': lambda o: ipaddress.IPv6Address(o),
     'vl_api_ip6_prefix_t': lambda o: ipaddress.IPv6Network((o.address, o.len)),