bgpd: Initialize attr->local_pref to the configured default value

When we use network/redistribute local_preference is configured inproperly
when using route-maps something like:

```
network 100.100.100.100/32 route-map rm1
network 100.100.100.200/32 route-map rm2

route-map rm1 permit 10
 set local-preference +10
route-map rm2 permit 10
 set local-preference -10
```

Before:
```
root@spine1-debian-11:~# vtysh -c 'show bgp ipv4 unicast 100.100.100.100/32 json' | jq '.paths[].locPrf'
10
root@spine1-debian-11:~# vtysh -c 'show bgp ipv4 unicast 100.100.100.200/32 json' | jq '.paths[].locPrf'
0
```

After:
```
root@spine1-debian-11:~# vtysh -c 'show bgp ipv4 unicast 100.100.100.100/32 json' | jq '.paths[].locPrf'
110
root@spine1-debian-11:~# vtysh -c 'show bgp ipv4 unicast 100.100.100.200/32 json' | jq '.paths[].locPrf'
90
```

Set local-preference as the default value configured per BGP instance, but
do not set LOCAL_PREF flag by default.

Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>

12 files changed, 38 insertions, 24 deletions

diff --git a/bgpd/bgp_attr.c b/bgpd/bgp_attr.c
index d57281a70..b576d188b 100644
--- a/bgpd/bgp_attr.c
+++ b/bgpd/bgp_attr.c
@@ -951,7 +951,8 @@ struct attr *bgp_attr_intern(struct attr *attr)
 }
 
 /* Make network statement's attribute. */
-struct attr *bgp_attr_default_set(struct attr *attr, uint8_t origin)
+struct attr *bgp_attr_default_set(struct attr *attr, struct bgp *bgp,
+				  uint8_t origin)
 {
 	memset(attr, 0, sizeof(struct attr));
 
@@ -965,6 +966,7 @@ struct attr *bgp_attr_default_set(struct attr *attr, uint8_t origin)
 	attr->label = MPLS_INVALID_LABEL;
 	attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_NEXT_HOP);
 	attr->mp_nexthop_len = IPV6_MAX_BYTELEN;
+	attr->local_pref = bgp->default_local_pref;
 
 	return attr;
 }
diff --git a/bgpd/bgp_attr.h b/bgpd/bgp_attr.h
index 01d993dab..06f350b36 100644
--- a/bgpd/bgp_attr.h
+++ b/bgpd/bgp_attr.h
@@ -393,7 +393,8 @@ extern struct attr *bgp_attr_intern(struct attr *attr);
 extern void bgp_attr_unintern_sub(struct attr *attr);
 extern void bgp_attr_unintern(struct attr **pattr);
 extern void bgp_attr_flush(struct attr *attr);
-extern struct attr *bgp_attr_default_set(struct attr *attr, uint8_t origin);
+extern struct attr *bgp_attr_default_set(struct attr *attr, struct bgp *bgp,
+					 uint8_t origin);
 extern struct attr *bgp_attr_aggregate_intern(
 	struct bgp *bgp, uint8_t origin, struct aspath *aspath,
 	struct community *community, struct ecommunity *ecommunity,
diff --git a/bgpd/bgp_evpn.c b/bgpd/bgp_evpn.c
index 74395bb0e..3483ece5b 100644
--- a/bgpd/bgp_evpn.c
+++ b/bgpd/bgp_evpn.c
@@ -1292,7 +1292,7 @@ static int update_evpn_type5_route(struct bgp *bgp_vrf, struct prefix_evpn *evp,
 		attr = *src_attr;
 	else {
 		memset(&attr, 0, sizeof(attr));
-		bgp_attr_default_set(&attr, BGP_ORIGIN_IGP);
+		bgp_attr_default_set(&attr, bgp_vrf, BGP_ORIGIN_IGP);
 	}
 
 	/* Advertise Primary IP (PIP) is enabled, send individual
@@ -1731,7 +1731,7 @@ static int update_evpn_route(struct bgp *bgp, struct bgpevpn *vpn,
 	memset(&attr, 0, sizeof(attr));
 
 	/* Build path-attribute for this route. */
-	bgp_attr_default_set(&attr, BGP_ORIGIN_IGP);
+	bgp_attr_default_set(&attr, bgp, BGP_ORIGIN_IGP);
 	attr.nexthop = vpn->originator_ip;
 	attr.mp_nexthop_global_in = vpn->originator_ip;
 	attr.mp_nexthop_len = BGP_ATTR_NHLEN_IPV4;
@@ -1994,7 +1994,7 @@ void bgp_evpn_update_type2_route_entry(struct bgp *bgp, struct bgpevpn *vpn,
 	 * some other values could differ for different routes. The
 	 * attributes will be shared in the hash table.
 	 */
-	bgp_attr_default_set(&attr, BGP_ORIGIN_IGP);
+	bgp_attr_default_set(&attr, bgp, BGP_ORIGIN_IGP);
 	attr.nexthop = vpn->originator_ip;
 	attr.mp_nexthop_global_in = vpn->originator_ip;
 	attr.mp_nexthop_len = BGP_ATTR_NHLEN_IPV4;
diff --git a/bgpd/bgp_evpn_mh.c b/bgpd/bgp_evpn_mh.c
index 92456080e..b42296f4d 100644
--- a/bgpd/bgp_evpn_mh.c
+++ b/bgpd/bgp_evpn_mh.c
@@ -636,7 +636,7 @@ static int bgp_evpn_type4_route_update(struct bgp *bgp,
 	memset(&attr, 0, sizeof(attr));
 
 	/* Build path-attribute for this route. */
-	bgp_attr_default_set(&attr, BGP_ORIGIN_IGP);
+	bgp_attr_default_set(&attr, bgp, BGP_ORIGIN_IGP);
 	attr.nexthop = es->originator_ip;
 	attr.mp_nexthop_global_in = es->originator_ip;
 	attr.mp_nexthop_len = BGP_ATTR_NHLEN_IPV4;
@@ -946,7 +946,7 @@ static int bgp_evpn_type1_route_update(struct bgp *bgp, struct bgp_evpn_es *es,
 	memset(&attr, 0, sizeof(attr));
 
 	/* Build path-attribute for this route. */
-	bgp_attr_default_set(&attr, BGP_ORIGIN_IGP);
+	bgp_attr_default_set(&attr, bgp, BGP_ORIGIN_IGP);
 	attr.nexthop = es->originator_ip;
 	attr.mp_nexthop_global_in = es->originator_ip;
 	attr.mp_nexthop_len = BGP_ATTR_NHLEN_IPV4;
diff --git a/bgpd/bgp_route.c b/bgpd/bgp_route.c
index 5df45aa31..c9269c230 100644
--- a/bgpd/bgp_route.c
+++ b/bgpd/bgp_route.c
@@ -5811,7 +5811,7 @@ void bgp_static_update(struct bgp *bgp, const struct prefix *p,
 
 	dest = bgp_afi_node_get(bgp->rib[afi][safi], afi, safi, p, NULL);
 
-	bgp_attr_default_set(&attr, BGP_ORIGIN_IGP);
+	bgp_attr_default_set(&attr, bgp, BGP_ORIGIN_IGP);
 
 	attr.nexthop = bgp_static->igpnexthop;
 	attr.med = bgp_static->igpmetric;
@@ -6114,7 +6114,7 @@ static void bgp_static_update_safi(struct bgp *bgp, const struct prefix *p,
 	dest = bgp_afi_node_get(bgp->rib[afi][safi], afi, safi, p,
 				&bgp_static->prd);
 
-	bgp_attr_default_set(&attr, BGP_ORIGIN_IGP);
+	bgp_attr_default_set(&attr, bgp, BGP_ORIGIN_IGP);
 
 	attr.nexthop = bgp_static->igpnexthop;
 	attr.med = bgp_static->igpmetric;
@@ -8315,7 +8315,7 @@ void bgp_redistribute_add(struct bgp *bgp, struct prefix *p,
 	struct bgp_redist *red;
 
 	/* Make default attribute. */
-	bgp_attr_default_set(&attr, BGP_ORIGIN_INCOMPLETE);
+	bgp_attr_default_set(&attr, bgp, BGP_ORIGIN_INCOMPLETE);
 	/*
 	 * This must not be NULL to satisfy Coverity SA
 	 */
diff --git a/bgpd/bgp_routemap.c b/bgpd/bgp_routemap.c
index c7f5e0433..e0372b31f 100644
--- a/bgpd/bgp_routemap.c
+++ b/bgpd/bgp_routemap.c
@@ -1968,7 +1968,7 @@ route_set_local_pref(void *rule, const struct prefix *prefix, void *object)
 	path = object;
 
 	/* Set local preference value. */
-	if (path->attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF))
+	if (path->attr->local_pref)
 		locpref = path->attr->local_pref;
 
 	path->attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF);
diff --git a/bgpd/bgp_updgrp_adv.c b/bgpd/bgp_updgrp_adv.c
index 87558f9c3..518ce485a 100644
--- a/bgpd/bgp_updgrp_adv.c
+++ b/bgpd/bgp_updgrp_adv.c
@@ -812,12 +812,11 @@ void subgroup_default_originate(struct update_subgroup *subgrp, int withdraw)
 	bgp = peer->bgp;
 	from = bgp->peer_self;
 
-	bgp_attr_default_set(&attr, BGP_ORIGIN_IGP);
+	bgp_attr_default_set(&attr, bgp, BGP_ORIGIN_IGP);
 
 	/* make coverity happy */
 	assert(attr.aspath);
 
-	attr.local_pref = bgp->default_local_pref;
 	attr.med = 0;
 	attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_MULTI_EXIT_DISC);
 
diff --git a/bgpd/rfapi/rfapi.c b/bgpd/rfapi/rfapi.c
index 3aa886837..35a76e783 100644
--- a/bgpd/rfapi/rfapi.c
+++ b/bgpd/rfapi/rfapi.c
@@ -627,7 +627,7 @@ void add_vnc_route(struct rfapi_descriptor *rfd, /* cookie, VPN UN addr, peer */
 	/* Make default attribute. Produces already-interned attr.aspath */
 	/* Cripes, the memory management of attributes is byzantine */
 
-	bgp_attr_default_set(&attr, BGP_ORIGIN_INCOMPLETE);
+	bgp_attr_default_set(&attr, bgp, BGP_ORIGIN_INCOMPLETE);
 
 	/*
 	 * At this point:
diff --git a/bgpd/rfapi/vnc_export_bgp.c b/bgpd/rfapi/vnc_export_bgp.c
index c479b4d65..7cfa2ed67 100644
--- a/bgpd/rfapi/vnc_export_bgp.c
+++ b/bgpd/rfapi/vnc_export_bgp.c
@@ -731,7 +731,7 @@ void vnc_direct_bgp_add_prefix(struct bgp *bgp,
 		return;
 	}
 
-	bgp_attr_default_set(&attr, BGP_ORIGIN_INCOMPLETE);
+	bgp_attr_default_set(&attr, bgp, BGP_ORIGIN_INCOMPLETE);
 	/* TBD set some configured med, see add_vnc_route() */
 
 	vnc_zlog_debug_verbose(
@@ -980,7 +980,7 @@ void vnc_direct_bgp_add_nve(struct bgp *bgp, struct rfapi_descriptor *rfd)
 				return;
 			}
 
-			bgp_attr_default_set(&attr, BGP_ORIGIN_INCOMPLETE);
+			bgp_attr_default_set(&attr, bgp, BGP_ORIGIN_INCOMPLETE);
 			/* TBD set some configured med, see add_vnc_route() */
 
 			/*
@@ -1307,7 +1307,7 @@ static void vnc_direct_bgp_add_group_afi(struct bgp *bgp,
 		return;
 	}
 
-	bgp_attr_default_set(&attr, BGP_ORIGIN_INCOMPLETE);
+	bgp_attr_default_set(&attr, bgp, BGP_ORIGIN_INCOMPLETE);
 	/* TBD set some configured med, see add_vnc_route() */
 
 	/*
diff --git a/tests/topotests/bgp_set_local_preference_add_subtract/r2/bgpd.conf b/tests/topotests/bgp_set_local_preference_add_subtract/r2/bgpd.conf
index 82a01d457..1f85a3578 100644
--- a/tests/topotests/bgp_set_local_preference_add_subtract/r2/bgpd.conf
+++ b/tests/topotests/bgp_set_local_preference_add_subtract/r2/bgpd.conf
@@ -1,5 +1,7 @@
 router bgp 65000
   no bgp ebgp-requires-policy
+  no bgp network import-check
+  network 10.10.10.2/32 route-map l2
   neighbor 192.168.255.1 remote-as 65000
   neighbor 192.168.255.1 timers 3 10
   address-family ipv4
@@ -9,3 +11,5 @@ router bgp 65000
 !
 route-map r1-out permit 10
   set local-preference +50
+route-map l2 permit 10
+  set local-preference +10
diff --git a/tests/topotests/bgp_set_local_preference_add_subtract/r3/bgpd.conf b/tests/topotests/bgp_set_local_preference_add_subtract/r3/bgpd.conf
index 65e092b0f..49b8f1ce2 100644
--- a/tests/topotests/bgp_set_local_preference_add_subtract/r3/bgpd.conf
+++ b/tests/topotests/bgp_set_local_preference_add_subtract/r3/bgpd.conf
@@ -1,7 +1,9 @@
 router bgp 65000
   no bgp ebgp-requires-policy
+  no bgp network import-check
   neighbor 192.168.255.1 remote-as 65000
   neighbor 192.168.255.1 timers 3 10
+  network 10.10.10.3/32 route-map l3
   address-family ipv4
     redistribute connected
     neighbor 192.168.255.1 route-map r1-out out
@@ -9,3 +11,5 @@ router bgp 65000
 !
 route-map r1-out permit 10
   set local-preference -50
+route-map l3 permit 10
+  set local-preference -10
diff --git a/tests/topotests/bgp_set_local_preference_add_subtract/test_bgp_set_local-preference_add_subtract.py b/tests/topotests/bgp_set_local_preference_add_subtract/test_bgp_set_local-preference_add_subtract.py
index d238cc94e..ec9c8a41c 100644
--- a/tests/topotests/bgp_set_local_preference_add_subtract/test_bgp_set_local-preference_add_subtract.py
+++ b/tests/topotests/bgp_set_local_preference_add_subtract/test_bgp_set_local-preference_add_subtract.py
@@ -89,22 +89,26 @@ def test_bgp_set_local_preference():
         expected = {
             "192.168.255.2": {
                 "bgpState": "Established",
-                "addressFamilyInfo": {"ipv4Unicast": {"acceptedPrefixCounter": 2}},
+                "addressFamilyInfo": {"ipv4Unicast": {"acceptedPrefixCounter": 3}},
             },
             "192.168.255.3": {
                 "bgpState": "Established",
-                "addressFamilyInfo": {"ipv4Unicast": {"acceptedPrefixCounter": 2}},
+                "addressFamilyInfo": {"ipv4Unicast": {"acceptedPrefixCounter": 3}},
             },
         }
         return topotest.json_cmp(output, expected)
 
     def _bgp_check_local_preference(router):
-        output = json.loads(router.vtysh_cmd("show ip bgp 172.16.255.254/32 json"))
+        output = json.loads(router.vtysh_cmd("show bgp ipv4 unicast json"))
         expected = {
-            "paths": [
-                {"locPrf": 50, "nexthops": [{"ip": "192.168.255.3"}]},
-                {"locPrf": 150, "nexthops": [{"ip": "192.168.255.2"}]},
-            ]
+            "routes": {
+                "10.10.10.2/32": [{"locPrf": 160}],
+                "10.10.10.3/32": [{"locPrf": 40}],
+                "172.16.255.254/32": [
+                    {"locPrf": 50, "nexthops": [{"ip": "192.168.255.3"}]},
+                    {"locPrf": 150, "nexthops": [{"ip": "192.168.255.2"}]},
+                ],
+            }
         }
         return topotest.json_cmp(output, expected)