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>

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 */

isisd/isis_affinitymap.h

@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* IS-IS  affinity-map header
+ * Copyright 2023 6WIND S.A.
+ */
+
+#ifndef __ISIS_AFFINITYMAP_H__
+#define __ISIS_AFFINITYMAP_H__
+
+#include "lib/affinitymap.h"
+
+#ifndef FABRICD
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern void isis_affinity_map_init(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ifndef FABRICD */
+
+#endif /* __ISIS_AFFINITYMAP_H__ */

isisd/isis_main.c

@@ -29,6 +29,7 @@
 #include "routemap.h"
 #include "affinitymap.h"
 
+#include "isisd/isis_affinitymap.h"
 #include "isisd/isis_constants.h"
 #include "isisd/isis_common.h"
 #include "isisd/isis_flags.h"
@@ -290,7 +291,9 @@ int main(int argc, char **argv, char **envp)
 	lsp_init();
 	mt_init();
 
-	affinity_map_init();
+#ifndef FABRICD
+	isis_affinity_map_init();
+#endif /* ifndef FABRICD */
 
 	isis_zebra_init(master, instance);
 	isis_bfd_init(master);

isisd/subdir.am

@@ -19,6 +19,7 @@ vtysh_daemons += fabricd
 endif
 
 noinst_HEADERS += \
+	isisd/isis_affinitymap.h \
 	isisd/isis_adjacency.h \
 	isisd/isis_bfd.h \
 	isisd/isis_circuit.h \
@@ -56,6 +57,7 @@ noinst_HEADERS += \
 	# end
 
 LIBISIS_SOURCES = \
+	isisd/isis_affinitymap.c \
 	isisd/isis_adjacency.c \
 	isisd/isis_bfd.c \
 	isisd/isis_circuit.c \