Merge pull request FRRouting#13137 from FRRouting/mergify/bp/stable/8.5/pr-13124

bgpd: Do not announce routes immediatelly on prefix/distribute/filter changes (backport FRRouting#13124)

Author: ton31337

bgpd/bgpd.c

@@ -5603,20 +5603,9 @@ void peer_on_policy_change(struct peer *peer, afi_t afi, safi_t safi,
 			return;
 
 		if (CHECK_FLAG(peer->cap, PEER_CAP_REFRESH_OLD_RCV) ||
-		    CHECK_FLAG(peer->cap, PEER_CAP_REFRESH_NEW_RCV)) {
-			if (CHECK_FLAG(peer->af_cap[afi][safi],
-				       PEER_CAP_ORF_PREFIX_SM_ADV) &&
-			    (CHECK_FLAG(peer->af_cap[afi][safi],
-					PEER_CAP_ORF_PREFIX_RM_RCV) ||
-			     CHECK_FLAG(peer->af_cap[afi][safi],
-					PEER_CAP_ORF_PREFIX_RM_OLD_RCV)))
-				peer_clear_soft(peer, afi, safi,
-						BGP_CLEAR_SOFT_IN_ORF_PREFIX);
-			else
-				bgp_route_refresh_send(
-					peer, afi, safi, 0, 0, 0,
-					BGP_ROUTE_REFRESH_NORMAL);
-		}
+		    CHECK_FLAG(peer->cap, PEER_CAP_REFRESH_NEW_RCV))
+			bgp_route_refresh_send(peer, afi, safi, 0, 0, 0,
+					       BGP_ROUTE_REFRESH_NORMAL);
 	}
 }
 
@@ -6846,11 +6835,18 @@ static void peer_prefix_list_update(struct prefix_list *plist)
 
 				/* If we touch prefix-list, we need to process
 				 * new updates. This is important for ORF to
-				 * work correctly as well.
+				 * work correctly.
 				 */
-				if (peer->afc_nego[afi][safi])
-					peer_on_policy_change(peer, afi, safi,
-							      0);
+				if (CHECK_FLAG(peer->af_cap[afi][safi],
+					       PEER_CAP_ORF_PREFIX_SM_ADV) &&
+				    (CHECK_FLAG(peer->af_cap[afi][safi],
+						PEER_CAP_ORF_PREFIX_RM_RCV) ||
+				     CHECK_FLAG(
+					     peer->af_cap[afi][safi],
+					     PEER_CAP_ORF_PREFIX_RM_OLD_RCV)))
+					peer_clear_soft(
+						peer, afi, safi,
+						BGP_CLEAR_SOFT_IN_ORF_PREFIX);
 			}
 		}
 		for (ALL_LIST_ELEMENTS(bgp->group, node, nnode, group)) {

tests/topotests/bgp_route_map_delay_timer/__init__.py

@@ -0,0 +1,24 @@
+!
+debug bgp updates
+debug bgp neighbor
+!
+bgp route-map delay-timer 5
+!
+router bgp 65001
+ no bgp ebgp-requires-policy
+ no bgp network import-check
+ neighbor 192.168.1.2 remote-as external
+ address-family ipv4 unicast
+  network 10.10.10.1/32
+  network 10.10.10.2/32
+  network 10.10.10.3/32
+  aggregate-address 10.10.10.0/24 summary-only
+  neighbor 192.168.1.2 unsuppress-map r2
+ exit-address-family
+!
+ip prefix-list r1 seq 5 permit 10.10.10.1/32
+ip prefix-list r1 seq 10 permit 10.10.10.2/32
+!
+route-map r2 permit 10
+ match ip address prefix-list r1
+exit

tests/topotests/bgp_route_map_delay_timer/r1/bgpd.conf

@@ -0,0 +1,4 @@
+!
+int r1-eth0
+ ip address 192.168.1.1/24
+!

tests/topotests/bgp_route_map_delay_timer/r1/zebra.conf

@@ -0,0 +1,4 @@
+router bgp 65002
+ no bgp ebgp-requires-policy
+ neighbor 192.168.1.1 remote-as external
+!

tests/topotests/bgp_route_map_delay_timer/r2/bgpd.conf

@@ -0,0 +1,4 @@
+!
+int r2-eth0
+ ip address 192.168.1.2/24
+!

tests/topotests/bgp_route_map_delay_timer/r2/zebra.conf

@@ -0,0 +1,120 @@
+#!/usr/bin/env python
+# SPDX-License-Identifier: ISC
+
+# Copyright (c) 2023 by
+# Donatas Abraitis <[email protected]>
+#
+
+"""
+
+"""
+
+import os
+import sys
+import json
+import pytest
+import functools
+
+pytestmark = pytest.mark.bgpd
+
+CWD = os.path.dirname(os.path.realpath(__file__))
+sys.path.append(os.path.join(CWD, "../"))
+
+# pylint: disable=C0413
+from lib import topotest
+from lib.topogen import Topogen, TopoRouter, get_topogen
+
+pytestmark = [pytest.mark.bgpd]
+
+
+def setup_module(mod):
+    topodef = {"s1": ("r1", "r2")}
+    tgen = Topogen(topodef, mod.__name__)
+    tgen.start_topology()
+
+    router_list = tgen.routers()
+
+    for i, (rname, router) in enumerate(router_list.items(), 1):
+        router.load_config(
+            TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname))
+        )
+        router.load_config(
+            TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.conf".format(rname))
+        )
+
+    tgen.start_router()
+
+
+def teardown_module(mod):
+    tgen = get_topogen()
+    tgen.stop_topology()
+
+
+def test_bgp_route_map_delay_timer():
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    r1 = tgen.gears["r1"]
+    r2 = tgen.gears["r2"]
+
+    def _bgp_converge_1():
+        output = json.loads(
+            r1.vtysh_cmd(
+                "show bgp ipv4 unicast neighbor 192.168.1.2 advertised-routes json"
+            )
+        )
+        expected = {
+            "advertisedRoutes": {
+                "10.10.10.0/24": {},
+                "10.10.10.1/32": {},
+                "10.10.10.2/32": {},
+                "10.10.10.3/32": None,
+            }
+        }
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(_bgp_converge_1)
+    _, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+    assert result is None, "10.10.10.3/32 should not be advertised to r2"
+
+    # Set route-map delay-timer to max value and remove 10.10.10.2/32.
+    # After this, r1 MUST do not announce updates immediately, and wait
+    # 600 seconds before withdrawing 10.10.10.2/32.
+    r2.vtysh_cmd(
+        """
+        configure terminal
+            bgp route-map delay-timer 600
+            no ip prefix-list r1 seq 10 permit 10.10.10.2/32
+    """
+    )
+
+    def _bgp_converge_2():
+        output = json.loads(
+            r1.vtysh_cmd(
+                "show bgp ipv4 unicast neighbor 192.168.1.2 advertised-routes json"
+            )
+        )
+        expected = {
+            "advertisedRoutes": {
+                "10.10.10.0/24": {},
+                "10.10.10.1/32": {},
+                "10.10.10.2/32": None,
+                "10.10.10.3/32": None,
+            }
+        }
+        return topotest.json_cmp(output, expected)
+
+    # We are checking `not None` here to wait count*wait time and if we have different
+    # results than expected, it means good - 10.10.10.2/32 wasn't withdrawn immediately.
+    test_func = functools.partial(_bgp_converge_2)
+    _, result = topotest.run_and_expect(test_func, not None, count=60, wait=0.5)
+    assert (
+        result is not None
+    ), "10.10.10.2/32 advertised, but should not be advertised to r2"
+
+
+if __name__ == "__main__":
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))