isisd: added support for routemap match tag in redistribution

Now it's possible to filter routes redistributed by another protocol using tag which comes from zebra daemon. Example of a possible configuration: ``` ! ipv6 route fd00::/48 blackhole tag 20 ipv6 route fd00::/60 blackhole tag 10 ! interface one ipv6 router isis COMMON isis circuit-type level-1 ! interface two ipv6 router isis COMMON isis circuit-type level-2-only ! router isis COMMON net fd.0000.0000.0000.0001.00 redistribute ipv6 static level-1 route-map static-l1 redistribute ipv6 static level-2 route-map static-l2 topology ipv6-unicast ! route-map static-l1 permit 10 match tag 10 ! route-map static-l2 permit 10 match tag 20 ! ``` Signed-off-by: Emanuele Altomare <[email protected]>
FRRouting · Mar 5, 2021 · 3b1e3aa · 3b1e3aa
1 parent 130daf2
commit 3b1e3aa
Show file tree

Hide file tree

Showing 4 changed files with 39 additions and 4 deletions.
diff --git a/isisd/isis_redist.c b/isisd/isis_redist.c
@@ -219,7 +219,7 @@ static void isis_redist_ensure_default(struct isis *isis, int family)
 /* Handle notification about route being added */
 void isis_redist_add(struct isis *isis, int type, struct prefix *p,
 		     struct prefix_ipv6 *src_p, uint8_t distance,
-		     uint32_t metric)
+		     uint32_t metric, const route_tag_t tag)
 {
 	int family = p->family;
 	struct route_table *ei_table = get_ext_info(isis, family);
@@ -250,6 +250,7 @@ void isis_redist_add(struct isis *isis, int type, struct prefix *p,
 	info->origin = type;
 	info->distance = distance;
 	info->metric = metric;
+	info->tag = tag;
 
 	if (is_default_prefix(p)
 	    && (!src_p || !src_p->prefixlen)) {
@@ -288,7 +289,7 @@ void isis_redist_delete(struct isis *isis, int type, struct prefix *p,
 		 * "always" setting will ignore routes with origin
 		 * DEFAULT_ROUTE. */
 		isis_redist_add(isis, DEFAULT_ROUTE, p, NULL, 254,
-				MAX_WIDE_PATH_METRIC);
+				MAX_WIDE_PATH_METRIC, 0);
 		return;
 	}
 

diff --git a/isisd/isis_redist.h b/isisd/isis_redist.h
@@ -31,6 +31,7 @@ struct isis_ext_info {
 	int origin;
 	uint32_t metric;
 	uint8_t distance;
+	route_tag_t tag;
 };
 
 struct isis_redist {
@@ -50,7 +51,7 @@ struct route_table *get_ext_reach(struct isis_area *area, int family,
 				  int level);
 void isis_redist_add(struct isis *isis, int type, struct prefix *p,
 		     struct prefix_ipv6 *src_p, uint8_t distance,
-		     uint32_t metric);
+		     uint32_t metric, route_tag_t tag);
 void isis_redist_delete(struct isis *isis, int type, struct prefix *p,
 			struct prefix_ipv6 *src_p);
 int isis_redist_config_write(struct vty *vty, struct isis_area *area,

diff --git a/isisd/isis_routemap.c b/isisd/isis_routemap.c
@@ -112,6 +112,35 @@ static const struct route_map_rule_cmd
 
 /* ------------------------------------------------------------*/
 
+/* `match tag TAG' */
+/* Match function return 1 if match is success else return zero. */
+static enum route_map_cmd_result_t
+route_match_tag(void *rule, const struct prefix *p, void *object)
+{
+	route_tag_t *tag;
+	struct isis_ext_info *info;
+	route_tag_t info_tag;
+
+	tag = rule;
+	info = object;
+
+	info_tag = info->tag;
+	if (info_tag == *tag)
+		return RMAP_MATCH;
+	else
+		return RMAP_NOMATCH;
+}
+
+/* Route map commands for tag matching. */
+static const struct route_map_rule_cmd route_match_tag_cmd = {
+	"tag",
+	route_match_tag,
+	route_map_rule_tag_compile,
+	route_map_rule_tag_free,
+};
+
+/* ------------------------------------------------------------*/
+
 static enum route_map_cmd_result_t
 route_match_ipv6_address(void *rule, const struct prefix *prefix, void *object)
 {
@@ -234,12 +263,16 @@ void isis_route_map_init(void)
 	route_map_match_ipv6_address_prefix_list_hook(generic_match_add);
 	route_map_no_match_ipv6_address_prefix_list_hook(generic_match_delete);
 
+	route_map_match_tag_hook(generic_match_add);
+	route_map_no_match_tag_hook(generic_match_delete);
+
 	route_map_set_metric_hook(generic_set_add);
 	route_map_no_set_metric_hook(generic_set_delete);
 
 	route_map_install_match(&route_match_ip_address_cmd);
 	route_map_install_match(&route_match_ip_address_prefix_list_cmd);
 	route_map_install_match(&route_match_ipv6_address_cmd);
 	route_map_install_match(&route_match_ipv6_address_prefix_list_cmd);
+	route_map_install_match(&route_match_tag_cmd);
 	route_map_install_set(&route_set_metric_cmd);
 }
diff --git a/isisd/isis_zebra.c b/isisd/isis_zebra.c
@@ -509,7 +509,7 @@ static int isis_zebra_read(ZAPI_CALLBACK_ARGS)
 
 	if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD)
 		isis_redist_add(isis, api.type, &api.prefix, &api.src_prefix,
-				api.distance, api.metric);
+				api.distance, api.metric, api.tag);
 	else
 		isis_redist_delete(isis, api.type, &api.prefix,
 				   &api.src_prefix);