bgpd: fix table-map option

Schedule zebra to withdraw routes filtered out by a table-map.

Signed-off-by: Alexander Skorichenko <[email protected]>

bgpd/bgp_zebra.c

@@ -1674,11 +1674,23 @@ void bgp_zebra_announce_table(struct bgp *bgp, afi_t afi, safi_t safi)
 	for (dest = bgp_table_top(table); dest; dest = bgp_route_next(dest))
 		for (pi = bgp_dest_get_bgp_path_info(dest); pi; pi = pi->next)
 			if (CHECK_FLAG(pi->flags, BGP_PATH_SELECTED) &&
-			    (pi->type == ZEBRA_ROUTE_BGP
-			     && (pi->sub_type == BGP_ROUTE_NORMAL
-				 || pi->sub_type == BGP_ROUTE_IMPORTED)))
-				bgp_zebra_route_install(dest, pi, bgp, true,
-							NULL, false);
+			    (pi->type == ZEBRA_ROUTE_BGP && (pi->sub_type == BGP_ROUTE_NORMAL ||
+							     pi->sub_type == BGP_ROUTE_IMPORTED))) {
+				bool is_add = true;
+
+				if (bgp->table_map[afi][safi].name) {
+					struct attr local_attr = *pi->attr;
+					struct bgp_path_info local_info = *pi;
+
+					local_info.attr = &local_attr;
+
+					is_add = bgp_table_map_apply(bgp->table_map[afi][safi].map,
+								     bgp_dest_get_prefix(dest),
+								     &local_info);
+				}
+
+				bgp_zebra_route_install(dest, pi, bgp, is_add, NULL, false);
+			}
 }
 
 /* Announce routes of any bgp subtype of a table to zebra */

tests/topotests/bgp_table_map/r1/frr.conf

@@ -0,0 +1,22 @@
+!
+int r1-eth0
+ ip address 10.255.0.1/24
+!
+access-list AccList seq 5 permit 10.0.0.1/32
+!
+route-map TableMap permit 10
+ match ip address AccList
+exit
+!
+router bgp 65001
+ bgp router-id 10.255.0.1
+ no bgp ebgp-requires-policy
+ neighbor 10.255.0.2 remote-as external
+ neighbor 10.255.0.2 timers 1 3
+ neighbor 10.255.0.2 timers connect 1
+ !
+ address-family ipv4 unicast
+  table-map TableMap
+ exit-address-family
+exit
+!

tests/topotests/bgp_table_map/r2/frr.conf

@@ -0,0 +1,18 @@
+!
+int r2-eth0
+ ip address 10.255.0.2/24
+!
+router bgp 65002
+ bgp router-id 10.255.0.2
+ no bgp ebgp-requires-policy
+ no bgp network import-check
+ neighbor 10.255.0.1 remote-as external
+ neighbor 10.255.0.1 timers 1 3
+ neighbor 10.255.0.1 timers connect 1
+ !
+ address-family ipv4 unicast
+  network 10.0.0.1/32
+  network 10.0.0.2/32
+ exit-address-family
+exit
+!

tests/topotests/bgp_table_map/test_bgp_table_map.py

@@ -0,0 +1,129 @@
+#!/usr/bin/env python
+# SPDX-License-Identifier: ISC
+
+import functools, json, os, pytest, re, sys
+
+CWD = os.path.dirname(os.path.realpath(__file__))
+sys.path.append(os.path.join(CWD, "../"))
+
+from lib import topotest
+from lib.topogen import Topogen, 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 _, (rname, router) in enumerate(router_list.items(), 1):
+        router.load_frr_config(
+            os.path.join(CWD, "{}/frr.conf".format(rname))
+        )
+
+    tgen.start_router()
+
+
+def teardown_module(mod):
+    tgen = get_topogen()
+    tgen.stop_topology()
+
+
+def test_bgp_table_map():
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    r1 = tgen.gears["r1"]
+
+    def _bgp_converge():
+        output = json.loads(
+            r1.vtysh_cmd( "show bgp ipv4 unicast summary json")
+        )
+        expected = {
+            "peers": {
+                "10.255.0.2": {
+                    "remoteAs": 65002,
+                    "state": "Established",
+                    "peerState": "OK",
+                },
+            },
+            "totalPeers": 1,
+        }
+
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(
+        _bgp_converge,
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
+    assert result is None, "Can't converge initial state"
+
+    def _bgp_with_table_map():
+        output = json.loads(r1.vtysh_cmd("show ip fib json"))
+        expected = {
+            "10.0.0.1/32": [],
+            "10.0.0.2/32": None,
+        }
+
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(
+        _bgp_with_table_map,
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=20, wait=1)
+    assert result is None, "Should contain only one of two shared networks"
+
+    #
+    # Unset table-map
+    #
+    r1.vtysh_cmd(
+        """
+        configure terminal
+          router bgp 65001
+            address-family ipv4 unicast
+              no table-map TableMap
+    """
+    )
+
+    def _bgp_without_table_map():
+        output = json.loads(r1.vtysh_cmd("show ip fib json"))
+        expected = {
+            "10.0.0.1/32": [],
+            "10.0.0.2/32": [],
+        }
+
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(
+        _bgp_without_table_map,
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=20, wait=1)
+    assert result is None, "Shouldn't contain both shared routes"
+
+    #
+    # Reset table-map
+    #
+    r1.vtysh_cmd(
+        """
+        configure terminal
+          router bgp 65001
+            address-family ipv4 unicast
+              table-map TableMap
+        """
+    )
+
+    test_func = functools.partial(
+        _bgp_with_table_map,
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=20, wait=1)
+    assert result is None, "Should contain only one of two shared networks"
+
+
+if __name__ == "__main__":
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))