isisd: implement the 'lsp-too-large' notification

Signed-off-by: Emanuele Di Pascale <emanuele@voltanet.io>

3 files changed, 51 insertions, 0 deletions

diff --git a/isisd/isis_northbound.c b/isisd/isis_northbound.c
index 657cc0027..de380876a 100644
--- a/isisd/isis_northbound.c
+++ b/isisd/isis_northbound.c
@@ -2466,6 +2466,25 @@ static void notif_prep_instance_hdr(const char *xpath,
 	listnode_add(args, data);
 }
 
+static void notif_prepr_iface_hdr(const char *xpath,
+				  const struct isis_circuit *circuit,
+				  struct list *args)
+{
+	char xpath_arg[XPATH_MAXLEN];
+	struct yang_data *data;
+
+	snprintf(xpath_arg, sizeof(xpath_arg), "%s/interface-name", xpath);
+	data = yang_data_new_string(xpath_arg, circuit->interface->name);
+	listnode_add(args, data);
+	snprintf(xpath_arg, sizeof(xpath_arg), "%s/interface-level", xpath);
+	data = yang_data_new_enum(xpath_arg, circuit->is_type);
+	listnode_add(args, data);
+	snprintf(xpath_arg, sizeof(xpath_arg), "%s/extended-circuit-id", xpath);
+	/* we do not seem to have the extended version of the circuit_id */
+	data = yang_data_new_uint32(xpath_arg, (uint32_t)circuit->circuit_id);
+	listnode_add(args, data);
+}
+
 /*
  * XPath:
  * /frr-isisd:database-overload
@@ -2485,6 +2504,31 @@ void isis_notif_db_overload(const struct isis_area *area, bool overload)
 	nb_notification_send(xpath, arguments);
 }
 
+/*
+ * XPath:
+ * /frr-isisd:lsp-too-large
+ */
+void isis_notif_lsp_too_large(const struct isis_circuit *circuit,
+			      uint32_t pdu_size, const char *lsp_id)
+{
+	const char *xpath = "/frr-isisd:lsp-too-large";
+	struct list *arguments = yang_data_list_new();
+	char xpath_arg[XPATH_MAXLEN];
+	struct yang_data *data;
+	struct isis_area *area = circuit->area;
+
+	notif_prep_instance_hdr(xpath, area, "default", arguments);
+	notif_prepr_iface_hdr(xpath, circuit, arguments);
+	snprintf(xpath_arg, sizeof(xpath_arg), "%s/pdu-size", xpath);
+	data = yang_data_new_uint32(xpath_arg, pdu_size);
+	listnode_add(arguments, data);
+	snprintf(xpath_arg, sizeof(xpath_arg), "%s/lsp-id", xpath);
+	data = yang_data_new_string(xpath_arg, lsp_id);
+	listnode_add(arguments, data);
+
+	nb_notification_send(xpath, arguments);
+}
+
 /* clang-format off */
 const struct frr_yang_module_info frr_isisd_info = {
 	.name = "frr-isisd",
diff --git a/isisd/isis_pdu.c b/isisd/isis_pdu.c
index 6303536c1..2347a1547 100644
--- a/isisd/isis_pdu.c
+++ b/isisd/isis_pdu.c
@@ -2238,6 +2238,11 @@ void send_lsp(struct isis_circuit *circuit, struct isis_lsp *lsp,
 			lsp->hdr.checksum, lsp->hdr.rem_lifetime,
 			circuit->interface->name, stream_get_endp(lsp->pdu),
 			stream_get_size(circuit->snd_stream));
+#ifndef FABRICD
+		/* send a northbound notification */
+		isis_notif_lsp_too_large(circuit, stream_get_endp(lsp->pdu),
+					 rawlspid_print(lsp->hdr.lsp_id));
+#endif /* ifndef FABRICD */
 		if (isis->debugs & DEBUG_PACKET_DUMP)
 			zlog_dump_data(STREAM_DATA(lsp->pdu),
 				       stream_get_endp(lsp->pdu));
diff --git a/isisd/isisd.h b/isisd/isisd.h
index 73f91bde0..c5f3f3734 100644
--- a/isisd/isisd.h
+++ b/isisd/isisd.h
@@ -223,6 +223,8 @@ extern void isis_northbound_init(void);
 
 /* YANG northbound notifications */
 extern void isis_notif_db_overload(const struct isis_area *area, bool overload);
+extern void isis_notif_lsp_too_large(const struct isis_circuit *circuit,
+				     uint32_t pdu_size, const char *lsp_id);
 /* Master of threads. */
 extern struct thread_master *master;