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[2019111] Added Support for BGP allow list feature to have route-map …
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…action of setting tag (#10869)

What I did:
Added support to create route-map action set tag
when the the allow prefix list matches. The tag can ben define by user in
constants.yml.

Why I did:
Since for Allow List feature we call from base route-map allow-list route-map having set tag option provides way for base route-map to do match tag and take any further action if needed. Adding tag provide metadata that can used by base route-map
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@abdosi
abdosi authored May 19, 2022
1 parent be4dbb1 commit 252168d
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Showing 2 changed files with 102 additions and 2 deletions.
17 changes: 17 additions & 0 deletions src/sonic-bgpcfgd/bgpcfgd/managers_allow_list.py
View file
Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,7 @@ def __init__(self, common_objs, db, table):
)
self.key_re = re.compile(r"^DEPLOYMENT_ID\|\d+\|\S+$|^DEPLOYMENT_ID\|\d+$")
self.enabled = self.__get_enabled()
self.prefix_match_tag = self.__get_routemap_tag()
self.__load_constant_lists()

def set_handler(self, key, data):
Expand Down Expand Up @@ -396,6 +397,8 @@ def __update_allow_route_map_entry(self, af, allow_address_pl_name, community_na
]
if not community_name.endswith(self.EMPTY_COMMUNITY):
cmds.append(" match community %s" % community_name)
elif self.prefix_match_tag:
cmds.append(" set tag %s" % self.prefix_match_tag)
return cmds

def __update_default_route_map_entry(self, route_map_name, default_action_community):
Expand Down Expand Up @@ -612,6 +615,20 @@ def __get_route_map_calls(self, rms):
inside_name = result.group(1)
return rm_2_call

def __get_routemap_tag(self):
"""
Find if any user define tag is provided to be used when allow prefifx list is matched
:return: string: prefix mix tag if define in constants.yml else None
"""
prefix_match_tag = None
if 'bgp' in self.constants and \
'allow_list' in self.constants["bgp"] and \
'prefix_match_tag' in \
self.constants["bgp"]["allow_list"]:
prefix_match_tag = \
self.constants["bgp"]["allow_list"]["prefix_match_tag"]
return prefix_match_tag

@staticmethod
def __get_peer_group_to_restart(deployment_id, pg_2_rm, rm_2_call):
"""
Expand Down
87 changes: 85 additions & 2 deletions src/sonic-bgpcfgd/tests/test_allow_list.py
View file
Original file line number Diff line number Diff line change
Expand Up @@ -25,8 +25,26 @@
}
}

global_constants_with_prefix_match_tag = {
"bgp": {
"allow_list": {
"enabled": True,
"default_pl_rules": {
"v4": [ "deny 0.0.0.0/0 le 17" ],
"v6": [
"deny 0::/0 le 59",
"deny 0::/0 ge 65"
]
},
"default_action": "permit",
"drop_community": "123:123",
"prefix_match_tag": "1001"
}
}
}

@patch.dict("sys.modules", swsscommon=swsscommon_module_mock)
def set_del_test(op, args, currect_config, expected_config, update_global_default_action=None):
def set_del_test(op, args, currect_config, expected_config, update_global_default_action=None, update_constant_prefix_match_tag=False):
from bgpcfgd.managers_allow_list import BGPAllowListMgr
set_del_test.push_list_called = False
def push_list(args):
Expand All @@ -44,7 +62,7 @@ def push_list(args):
'directory': Directory(),
'cfg_mgr': cfg_mgr,
'tf': TemplateFabric(),
'constants': deepcopy(global_constants),
'constants': deepcopy(global_constants) if not update_constant_prefix_match_tag else deepcopy(global_constants_with_prefix_match_tag)
}

mgr = BGPAllowListMgr(common_objs, "CONFIG_DB", "BGP_ALLOWED_PREFIXES")
Expand Down Expand Up @@ -91,6 +109,39 @@ def test_set_handler_with_community():
' match community COMMUNITY_ALLOW_LIST_DEPLOYMENT_ID_5_COMMUNITY_1010:2020',
]
)

def test_set_handler_with_community_and_prefix_match_tag():
set_del_test(
"SET",
("DEPLOYMENT_ID|5|1010:2020", {
"prefixes_v4": "10.20.30.0/24,30.50.0.0/16",
"prefixes_v6": "fc00:20::/64,fc00:30::/64",
}),
[
'route-map ALLOW_LIST_DEPLOYMENT_ID_5_V4 permit 65535',
' set community 123:123 additive',
'route-map ALLOW_LIST_DEPLOYMENT_ID_5_V6 permit 65535',
' set community 123:123 additive'
],
[
'ip prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_5_COMMUNITY_1010:2020_V4 seq 10 deny 0.0.0.0/0 le 17',
'ip prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_5_COMMUNITY_1010:2020_V4 seq 20 permit 10.20.30.0/24 le 32',
'ip prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_5_COMMUNITY_1010:2020_V4 seq 30 permit 30.50.0.0/16 le 32',
'ipv6 prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_5_COMMUNITY_1010:2020_V6 seq 10 deny ::/0 le 59',
'ipv6 prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_5_COMMUNITY_1010:2020_V6 seq 20 deny ::/0 ge 65',
'ipv6 prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_5_COMMUNITY_1010:2020_V6 seq 30 permit fc00:20::/64 le 128',
'ipv6 prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_5_COMMUNITY_1010:2020_V6 seq 40 permit fc00:30::/64 le 128',
'bgp community-list standard COMMUNITY_ALLOW_LIST_DEPLOYMENT_ID_5_COMMUNITY_1010:2020 permit 1010:2020',
'route-map ALLOW_LIST_DEPLOYMENT_ID_5_V4 permit 10',
' match ip address prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_5_COMMUNITY_1010:2020_V4',
' match community COMMUNITY_ALLOW_LIST_DEPLOYMENT_ID_5_COMMUNITY_1010:2020',
'route-map ALLOW_LIST_DEPLOYMENT_ID_5_V6 permit 10',
' match ipv6 address prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_5_COMMUNITY_1010:2020_V6',
' match community COMMUNITY_ALLOW_LIST_DEPLOYMENT_ID_5_COMMUNITY_1010:2020',
],
None, True
)

def test_set_handler_with_community_and_permit_action():
set_del_test(
"SET",
Expand Down Expand Up @@ -187,6 +238,38 @@ def test_set_handler_no_community():
' match ipv6 address prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_5_COMMUNITY_empty_V6',
]
)

def test_set_handler_no_community_and_prefix_match_tag():
set_del_test(
"SET",
("DEPLOYMENT_ID|5", {
"prefixes_v4": "20.20.30.0/24,40.50.0.0/16",
"prefixes_v6": "fc01:20::/64,fc01:30::/64",
}),
[
'route-map ALLOW_LIST_DEPLOYMENT_ID_5_V4 permit 65535',
' set community 123:123 additive',
'route-map ALLOW_LIST_DEPLOYMENT_ID_5_V6 permit 65535',
' set community 123:123 additive',
],
[
'ip prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_5_COMMUNITY_empty_V4 seq 10 deny 0.0.0.0/0 le 17',
'ip prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_5_COMMUNITY_empty_V4 seq 20 permit 20.20.30.0/24 le 32',
'ip prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_5_COMMUNITY_empty_V4 seq 30 permit 40.50.0.0/16 le 32',
'ipv6 prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_5_COMMUNITY_empty_V6 seq 10 deny ::/0 le 59',
'ipv6 prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_5_COMMUNITY_empty_V6 seq 20 deny ::/0 ge 65',
'ipv6 prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_5_COMMUNITY_empty_V6 seq 30 permit fc01:20::/64 le 128',
'ipv6 prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_5_COMMUNITY_empty_V6 seq 40 permit fc01:30::/64 le 128',
'route-map ALLOW_LIST_DEPLOYMENT_ID_5_V4 permit 30000',
' match ip address prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_5_COMMUNITY_empty_V4',
' set tag 1001',
'route-map ALLOW_LIST_DEPLOYMENT_ID_5_V6 permit 30000',
' match ipv6 address prefix-list PL_ALLOW_LIST_DEPLOYMENT_ID_5_COMMUNITY_empty_V6',
' set tag 1001',
],
None,True
)

def test_set_handler_no_community_with_permit_action():
set_del_test(
"SET",
Expand Down

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