isisd: add affinity-map configuration hooks

Add affinity-map hooks to check the utilization of affinity-map in
flex-algo contexts before its deletion and to update local TLVs when the
affinity-map bit-position is updated.

Signed-off-by: Louis Scalbert <louis.scalbert@6wind.com>

1 files changed, 91 insertions, 0 deletions

diff --git a/isisd/isis_affinitymap.c b/isisd/isis_affinitymap.c
new file mode 100644
index 0000000000..e681e820be
--- /dev/null
+++ b/isisd/isis_affinitymap.c
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* IS-IS  affinity-map
+ * Copyright 2023 6WIND S.A.
+ */
+
+#include <zebra.h>
+#include "lib/if.h"
+#include "lib/vrf.h"
+#include "isisd/isisd.h"
+#include "isisd/isis_affinitymap.h"
+
+#ifndef FABRICD
+
+static bool isis_affinity_map_check_use(const char *affmap_name)
+{
+	struct isis *isis = isis_lookup_by_vrfid(VRF_DEFAULT);
+	struct isis_area *area;
+	struct listnode *area_node, *fa_node;
+	struct flex_algo *fa;
+	struct affinity_map *map;
+	uint16_t pos;
+
+	map = affinity_map_get(affmap_name);
+	pos = map->bit_position;
+
+	for (ALL_LIST_ELEMENTS_RO(isis->area_list, area_node, area)) {
+		for (ALL_LIST_ELEMENTS_RO(area->flex_algos->flex_algos, fa_node,
+					  fa)) {
+			if (admin_group_get(&fa->admin_group_exclude_any,
+					    pos) ||
+			    admin_group_get(&fa->admin_group_include_any,
+					    pos) ||
+			    admin_group_get(&fa->admin_group_include_all, pos))
+				return true;
+		}
+	}
+	return false;
+}
+
+static void isis_affinity_map_update(const char *affmap_name, uint16_t old_pos,
+				     uint16_t new_pos)
+{
+	struct isis *isis = isis_lookup_by_vrfid(VRF_DEFAULT);
+	struct listnode *area_node, *fa_node;
+	struct isis_area *area;
+	struct flex_algo *fa;
+	bool changed;
+
+	for (ALL_LIST_ELEMENTS_RO(isis->area_list, area_node, area)) {
+		changed = false;
+		for (ALL_LIST_ELEMENTS_RO(area->flex_algos->flex_algos, fa_node,
+					  fa)) {
+			if (admin_group_get(&fa->admin_group_exclude_any,
+					    old_pos)) {
+				admin_group_unset(&fa->admin_group_exclude_any,
+						  old_pos);
+				admin_group_set(&fa->admin_group_exclude_any,
+						new_pos);
+				changed = true;
+			}
+			if (admin_group_get(&fa->admin_group_include_any,
+					    old_pos)) {
+				admin_group_unset(&fa->admin_group_include_any,
+						  old_pos);
+				admin_group_set(&fa->admin_group_include_any,
+						new_pos);
+				changed = true;
+			}
+			if (admin_group_get(&fa->admin_group_include_all,
+					    old_pos)) {
+				admin_group_unset(&fa->admin_group_include_all,
+						  old_pos);
+				admin_group_set(&fa->admin_group_include_all,
+						new_pos);
+				changed = true;
+			}
+		}
+		if (changed)
+			lsp_regenerate_schedule(area, area->is_type, 0);
+	}
+}
+
+void isis_affinity_map_init(void)
+{
+	affinity_map_init();
+
+	affinity_map_set_check_use_hook(isis_affinity_map_check_use);
+	affinity_map_set_update_hook(isis_affinity_map_update);
+}
+
+#endif /* ifndef FABRICD */