pimd: implement MSDP shutdown command

Allow MSDP protocol to be disabled.

Signed-off-by: Rafael Zalamena <rzalamena@opensourcerouting.org>

pimd/pim_cmd.c

@@ -7560,6 +7560,24 @@ DEFPY_ATTR(no_ip_pim_msdp_mesh_group,
 	return ret;
 }
 
+DEFPY(msdp_shutdown,
+      msdp_shutdown_cmd,
+      "[no] msdp shutdown",
+      NO_STR
+      CFG_MSDP_STR
+      "Shutdown MSDP operation\n")
+{
+	char xpath_value[XPATH_MAXLEN];
+
+	snprintf(xpath_value, sizeof(xpath_value), "./msdp/shutdown");
+	if (no)
+		nb_cli_enqueue_change(vty, xpath_value, NB_OP_DESTROY, NULL);
+	else
+		nb_cli_enqueue_change(vty, xpath_value, NB_OP_MODIFY, "true");
+
+	return nb_cli_apply_changes(vty, NULL);
+}
+
 static void ip_msdp_show_mesh_group(struct vty *vty, struct pim_msdp_mg *mg,
 				    struct json_object *json)
 {
@@ -8954,6 +8972,7 @@ void pim_cmd_init(void)
 	install_element(PIM_NODE, &no_pim_msdp_mesh_group_cmd);
 	install_element(PIM_NODE, &msdp_log_neighbor_changes_cmd);
 	install_element(PIM_NODE, &msdp_log_sa_changes_cmd);
+	install_element(PIM_NODE, &msdp_shutdown_cmd);
 
 	install_element(PIM_NODE, &pim_bsr_candidate_rp_cmd);
 	install_element(PIM_NODE, &pim_bsr_candidate_rp_group_cmd);

pimd/pim_msdp.c

@@ -734,6 +734,10 @@ static void pim_msdp_peer_state_chg_log(struct pim_msdp_peer *mp)
  * a tcp connection will be made */
 static void pim_msdp_peer_connect(struct pim_msdp_peer *mp)
 {
+	/* Stop here if we are shutdown. */
+	if (mp->pim->msdp.shutdown)
+		return;
+
 	mp->state = PIM_MSDP_CONNECTING;
 	if (pim_msdp_log_neighbor_events(mp->pim))
 		pim_msdp_peer_state_chg_log(mp);
@@ -744,6 +748,10 @@ static void pim_msdp_peer_connect(struct pim_msdp_peer *mp)
 /* 11.2.A3: passive peer - just listen for connections */
 static void pim_msdp_peer_listen(struct pim_msdp_peer *mp)
 {
+	/* Stop here if we are shutdown. */
+	if (mp->pim->msdp.shutdown)
+		return;
+
 	mp->state = PIM_MSDP_LISTEN;
 	if (pim_msdp_log_neighbor_events(mp->pim))
 		pim_msdp_peer_state_chg_log(mp);
@@ -1311,6 +1319,9 @@ bool pim_msdp_peer_config_write(struct vty *vty, struct pim_instance *pim)
 		written = true;
 	}
 
+	if (pim->msdp.shutdown)
+		vty_out(vty, " msdp shutdown\n");
+
 	return written;
 }
 
@@ -1431,3 +1442,42 @@ struct pim_msdp_mg_mbr *pim_msdp_mg_mbr_add(struct pim_instance *pim,
 
 	return mbr;
 }
+
+void pim_msdp_shutdown(struct pim_instance *pim, bool state)
+{
+	struct pim_msdp_peer *peer;
+	struct listnode *node;
+
+	/* Same value nothing to do. */
+	if (pim->msdp.shutdown == state)
+		return;
+
+	if (state) {
+		pim->msdp.shutdown = true;
+
+		for (ALL_LIST_ELEMENTS_RO(pim->msdp.peer_list, node, peer)) {
+			/* Stop the tcp connection and shutdown all timers */
+			pim_msdp_peer_stop_tcp_conn(peer, true);
+
+			/* Stop listening socket if any. */
+			event_cancel(&peer->auth_listen_ev);
+			if (peer->auth_listen_sock != -1)
+				close(peer->auth_listen_sock);
+
+			/* Disable and remove listener flag. */
+			UNSET_FLAG(pim->msdp.flags, PIM_MSDPF_ENABLE | PIM_MSDPF_LISTENER);
+		}
+	} else {
+		pim->msdp.shutdown = false;
+
+		for (ALL_LIST_ELEMENTS_RO(pim->msdp.peer_list, node, peer)) {
+			/* Start connection again. */
+			if (PIM_MSDP_PEER_IS_LISTENER(peer))
+				pim_msdp_peer_listen(peer);
+			else
+				pim_msdp_peer_connect(peer);
+
+			SET_FLAG(pim->msdp.flags, PIM_MSDPF_ENABLE);
+		}
+	}
+}

pimd/pim_msdp.h

@@ -216,6 +216,9 @@ struct pim_msdp {
 	uint32_t keep_alive;
 	/** MSDP global connection retry period. */
 	uint32_t connection_retry;
+
+	/** MSDP operation state. */
+	bool shutdown;
 };
 
 #define PIM_MSDP_PEER_READ_ON(mp)                                              \
@@ -327,6 +330,14 @@ void pim_msdp_peer_change_source(struct pim_msdp_peer *mp,
  */
 void pim_msdp_peer_restart(struct pim_msdp_peer *mp);
 
+/**
+ * Toggle MSDP functionality administrative state.
+ *
+ * \param pim PIM instance we want to shutdown.
+ * \param state shutdown state.
+ */
+void pim_msdp_shutdown(struct pim_instance *pim, bool state);
+
 #else /* PIM_IPV == 6 */
 static inline void pim_msdp_init(struct pim_instance *pim,
 				 struct event_loop *master)
@@ -370,6 +381,10 @@ static inline bool pim_msdp_peer_config_write(struct vty *vty,
 {
 	return false;
 }
+
+static inline void pim_msdp_shutdown(struct pim_instance *pim, bool state)
+{
+}
 #endif /* PIM_IPV == 6 */
 
 #endif

pimd/pim_nb.c

@@ -141,6 +141,12 @@ const struct frr_yang_module_info frr_pim_info = {
 				.modify = pim_msdp_log_sa_events_modify,
 			}
 		},
+		{
+			.xpath = "/frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-pim:pim/address-family/msdp/shutdown",
+			.cbs = {
+				.modify = pim_msdp_shutdown_modify,
+			}
+		},
 		{
 			.xpath = "/frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-pim:pim/address-family/msdp-mesh-groups",
 			.cbs = {

pimd/pim_nb.h

@@ -56,6 +56,7 @@ int pim_msdp_keep_alive_modify(struct nb_cb_modify_args *args);
 int pim_msdp_connection_retry_modify(struct nb_cb_modify_args *args);
 int pim_msdp_log_neighbor_events_modify(struct nb_cb_modify_args *args);
 int pim_msdp_log_sa_events_modify(struct nb_cb_modify_args *args);
+int pim_msdp_shutdown_modify(struct nb_cb_modify_args *args);
 int pim_msdp_mesh_group_create(struct nb_cb_create_args *args);
 int pim_msdp_mesh_group_destroy(struct nb_cb_destroy_args *args);
 int pim_msdp_mesh_group_members_create(struct nb_cb_create_args *args);

pimd/pim_nb_config.c

@@ -1098,6 +1098,7 @@ pim6_msdp_err(pim_msdp_peer_authentication_key_modify, nb_cb_modify_args);
 pim6_msdp_err(pim_msdp_peer_authentication_key_destroy, nb_cb_destroy_args);
 pim6_msdp_err(pim_msdp_log_neighbor_events_modify, nb_cb_modify_args);
 pim6_msdp_err(pim_msdp_log_sa_events_modify, nb_cb_modify_args);
+pim6_msdp_err(pim_msdp_shutdown_modify, nb_cb_modify_args);
 
 #if PIM_IPV != 6
 /*
@@ -1158,6 +1159,32 @@ int pim_msdp_log_sa_events_modify(struct nb_cb_modify_args *args)
 	return NB_OK;
 }
 
+/*
+ * XPath:
+ * /frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-pim:pim/address-family/msdp/shutdown
+ */
+int pim_msdp_shutdown_modify(struct nb_cb_modify_args *args)
+{
+	struct pim_instance *pim;
+	struct vrf *vrf;
+
+	switch (args->event) {
+	case NB_EV_VALIDATE:
+	case NB_EV_PREPARE:
+	case NB_EV_ABORT:
+		/* NOTHING */
+		break;
+
+	case NB_EV_APPLY:
+		vrf = nb_running_get_entry(args->dnode, NULL, true);
+		pim = vrf->info;
+		pim_msdp_shutdown(pim, yang_dnode_get_bool(args->dnode, NULL));
+		break;
+	}
+
+	return NB_OK;
+}
+
 /*
  * XPath:
  * /frr-routing:routing/control-plane-protocols/control-plane-protocol/frr-pim:pim/address-family/msdp-mesh-groups

yang/frr-pim.yang

@@ -264,6 +264,13 @@ module frr-pim {
         description
           "Log all MSDP SA related events.";
       }
+
+      leaf shutdown {
+        type boolean;
+        default false;
+        description
+          "Shutdown MSDP functionality.";
+      }
     }
 
     list msdp-mesh-groups {