isisd: Add helper function to request SRv6 locator information

This commit adds a function that iterates over all IS-IS areas and asks
the SRv6 Manager for information about the configured locators.

Signed-off-by: Carmine Scarpitta <cscarpit@cisco.com>
(cherry picked from commit 0b76fb3c133951c8d1203dbe7c2e5a4e1b67dffe)

2 files changed, 23 insertions, 0 deletions

diff --git a/isisd/isis_srv6.c b/isisd/isis_srv6.c
index 2348bd043a..8e9c21aa23 100644
--- a/isisd/isis_srv6.c
+++ b/isisd/isis_srv6.c
@@ -658,6 +658,27 @@ int isis_srv6_ifp_up_notify(struct interface *ifp)
 }
 
 /**
+ * Request SRv6 locator info from the SID Manager for all IS-IS areas where SRv6
+ * is enabled and a locator has been configured.
+ * This function is called as soon as the connection with Zebra is established
+ * to get information about all configured locators.
+ */
+void isis_srv6_locators_request(void)
+{
+	struct isis *isis = isis_lookup_by_vrfid(VRF_DEFAULT);
+	struct listnode *node;
+	struct isis_area *area;
+
+	if (!isis)
+		return;
+
+	for (ALL_LIST_ELEMENTS_RO(isis->area_list, node, area))
+		if (area->srv6db.config.enabled &&
+		    area->srv6db.config.srv6_locator_name[0] != '\0' && !area->srv6db.srv6_locator)
+			isis_zebra_srv6_manager_get_locator(area->srv6db.config.srv6_locator_name);
+}
+
+/**
  * IS-IS SRv6 initialization for given area.
  *
  * @param area	IS-IS area
diff --git a/isisd/isis_srv6.h b/isisd/isis_srv6.h
index bde14965f6..bb221b760a 100644
--- a/isisd/isis_srv6.h
+++ b/isisd/isis_srv6.h
@@ -156,6 +156,8 @@ isis_srv6_sid_alloc(struct isis_area *area, struct srv6_locator *locator,
 		    struct in6_addr *sid_value);
 extern void isis_srv6_sid_free(struct isis_srv6_sid *sid);
 
+void isis_srv6_locators_request(void);
+
 extern void isis_srv6_area_init(struct isis_area *area);
 extern void isis_srv6_area_term(struct isis_area *area);