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Diffstat (limited to 'bgpd/bgp_route.c')
-rw-r--r--bgpd/bgp_route.c124
1 files changed, 88 insertions, 36 deletions
diff --git a/bgpd/bgp_route.c b/bgpd/bgp_route.c
index ff88a55c08..f354071654 100644
--- a/bgpd/bgp_route.c
+++ b/bgpd/bgp_route.c
@@ -1268,6 +1268,39 @@ static void bgp_peer_as_override(struct bgp *bgp, afi_t afi, safi_t safi,
}
}
+void bgp_attr_add_gshut_community(struct attr *attr)
+{
+ struct community *old;
+ struct community *new;
+ struct community *merge;
+ struct community *gshut;
+
+ old = attr->community;
+ gshut = community_str2com("graceful-shutdown");
+
+ if (old) {
+ merge = community_merge(community_dup(old), gshut);
+
+ if (old->refcnt== 0)
+ community_free(old);
+
+ new = community_uniq_sort(merge);
+ community_free(merge);
+ } else {
+ new = community_dup(gshut);
+ }
+
+ community_free(gshut);
+ attr->community = new;
+ attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES);
+
+ /* When we add the graceful-shutdown community we must also
+ * lower the local-preference */
+ attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF);
+ attr->local_pref = BGP_GSHUT_LOCAL_PREF;
+}
+
+
static void subgroup_announce_reset_nhop(u_char family, struct attr *attr)
{
if (family == AF_INET)
@@ -1624,6 +1657,15 @@ int subgroup_announce_check(struct bgp_node *rn, struct bgp_info *ri,
}
}
+ if (bgp_flag_check(bgp, BGP_FLAG_GRACEFUL_SHUTDOWN)) {
+ if (peer->sort == BGP_PEER_IBGP || peer->sort == BGP_PEER_CONFED) {
+ attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF);
+ attr->local_pref = BGP_GSHUT_LOCAL_PREF;
+ } else {
+ bgp_attr_add_gshut_community(attr);
+ }
+ }
+
/* After route-map has been applied, we check to see if the nexthop to
* be carried in the attribute (that is used for the announcement) can
* be cleared off or not. We do this in all cases where we would be
@@ -2737,6 +2779,22 @@ int bgp_update(struct peer *peer, struct prefix *p, u_int32_t addpath_id,
goto filtered;
}
+ if (peer->sort == BGP_PEER_EBGP) {
+
+ /* If we receive the graceful-shutdown community from an eBGP peer we
+ * must lower local-preference */
+ if (new_attr.community &&
+ community_include(new_attr.community, COMMUNITY_GSHUT)) {
+ new_attr.flag |= ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF);
+ new_attr.local_pref = BGP_GSHUT_LOCAL_PREF;
+
+ /* If graceful-shutdown is configured then add the GSHUT community to
+ * all paths received from eBGP peers */
+ } else if (bgp_flag_check(peer->bgp, BGP_FLAG_GRACEFUL_SHUTDOWN)) {
+ bgp_attr_add_gshut_community(&new_attr);
+ }
+ }
+
/* next hop check. */
if (bgp_update_martian_nexthop(bgp, afi, safi, &new_attr)) {
reason = "martian or self next-hop;";
@@ -4057,9 +4115,18 @@ void bgp_static_update(struct bgp *bgp, struct prefix *p,
bgp_static_withdraw(bgp, p, afi, safi);
return;
}
+
+ if (bgp_flag_check(bgp, BGP_FLAG_GRACEFUL_SHUTDOWN))
+ bgp_attr_add_gshut_community(&attr_tmp);
+
attr_new = bgp_attr_intern(&attr_tmp);
- } else
+ } else {
+
+ if (bgp_flag_check(bgp, BGP_FLAG_GRACEFUL_SHUTDOWN))
+ bgp_attr_add_gshut_community(&attr);
+
attr_new = bgp_attr_intern(&attr);
+ }
for (ri = rn->info; ri; ri = ri->next)
if (ri->peer == bgp->peer_self && ri->type == ZEBRA_ROUTE_BGP
@@ -6154,6 +6221,9 @@ void bgp_redistribute_add(struct bgp *bgp, struct prefix *p,
}
}
+ if (bgp_flag_check(bgp, BGP_FLAG_GRACEFUL_SHUTDOWN))
+ bgp_attr_add_gshut_community(&attr_new);
+
bn = bgp_afi_node_get(bgp->rib[afi][SAFI_UNICAST], afi,
SAFI_UNICAST, p, NULL);
@@ -8044,8 +8114,8 @@ static int bgp_show_prefix_longer(struct vty *vty, struct bgp *bgp,
static int bgp_show_regexp(struct vty *vty, struct bgp *bgp,
const char *regstr, afi_t afi,
safi_t safi, enum bgp_show_type type);
-static int bgp_show_community(struct vty *vty, struct bgp *bgp, int argc,
- struct cmd_token **argv, int exact, afi_t afi,
+static int bgp_show_community(struct vty *vty, struct bgp *bgp,
+ const char *comstr, int exact, afi_t afi,
safi_t safi);
static int bgp_show_table(struct vty *vty, struct bgp *bgp,
@@ -8860,7 +8930,7 @@ DEFUN (show_ip_bgp,
|prefix-list WORD\
|filter-list WORD\
|statistics\
- |community <AA:NN|local-AS|no-advertise|no-export> [exact-match]\
+ |community <AA:NN|local-AS|no-advertise|no-export|graceful-shutdown> [exact-match]\
|community-list <(1-500)|WORD> [exact-match]\
|A.B.C.D/M longer-prefixes\
|X:X::X:X/M longer-prefixes\
@@ -8885,6 +8955,7 @@ DEFUN (show_ip_bgp,
"Do not send outside local AS (well-known community)\n"
"Do not advertise to any peer (well-known community)\n"
"Do not export to next AS (well-known community)\n"
+ "Graceful shutdown (well-known community)\n"
"Exact match of the communities\n"
"Display routes matching the community-list\n"
"community-list number\n"
@@ -8900,6 +8971,7 @@ DEFUN (show_ip_bgp,
int exact_match = 0;
struct bgp *bgp = NULL;
int idx = 0;
+ int idx_community_type = 0;
bgp_vty_find_and_parse_afi_safi_bgp(vty, argv, argc, &idx, &afi, &safi,
&bgp);
@@ -8928,12 +9000,15 @@ DEFUN (show_ip_bgp,
if (argv_find(argv, argc, "community", &idx)) {
/* show a specific community */
- if (argv_find(argv, argc, "local-AS", &idx)
- || argv_find(argv, argc, "no-advertise", &idx)
- || argv_find(argv, argc, "no-export", &idx)) {
- if (argv_find(argv, argc, "exact_match", &idx))
+ if (argv_find(argv, argc, "local-AS", &idx_community_type)
+ || argv_find(argv, argc, "no-advertise", &idx_community_type)
+ || argv_find(argv, argc, "no-export", &idx_community_type)
+ || argv_find(argv, argc, "graceful-shutdown", &idx_community_type)
+ || argv_find(argv, argc, "AA:NN", &idx_community_type)) {
+
+ if (argv_find(argv, argc, "exact-match", &idx))
exact_match = 1;
- return bgp_show_community(vty, bgp, argc, argv,
+ return bgp_show_community(vty, bgp, argv[idx_community_type]->arg,
exact_match, afi, safi);
}
}
@@ -9221,39 +9296,16 @@ static int bgp_show_route_map(struct vty *vty, struct bgp *bgp,
return bgp_show(vty, bgp, afi, safi, type, rmap, 0);
}
-static int bgp_show_community(struct vty *vty, struct bgp *bgp, int argc,
- struct cmd_token **argv, int exact, afi_t afi,
+static int bgp_show_community(struct vty *vty, struct bgp *bgp,
+ const char *comstr, int exact, afi_t afi,
safi_t safi)
{
struct community *com;
- struct buffer *b;
- int i;
- char *str;
- int first = 0;
int ret = 0;
- b = buffer_new(1024);
- for (i = 0; i < argc; i++) {
- if (first)
- buffer_putc(b, ' ');
- else {
- if (strmatch(argv[i]->text, "unicast")
- || strmatch(argv[i]->text, "multicast"))
- continue;
- first = 1;
- }
-
- buffer_putstr(b, argv[i]->arg);
- }
- buffer_putc(b, '\0');
-
- str = buffer_getstr(b);
- buffer_free(b);
-
- com = community_str2com(str);
- XFREE(MTYPE_TMP, str);
+ com = community_str2com(comstr);
if (!com) {
- vty_out(vty, "%% Community malformed: \n");
+ vty_out(vty, "%% Community malformed: %s\n", comstr);
return CMD_WARNING;
}
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-09 13:59:18 +0000