lib: remove vrf-interface config when removing the VRF

If we have the following configuration:
```
vrf red
 smth
 exit-vrf
!
interface red vrf red
 smth
```
And we delete the VRF using "no vrf red" command, we end up with:
```
interface red
 smth
```
Interface config is preserved but moved to the default VRF.

This is not an expected behavior. We should remove the interface config
when the VRF is deleted.

Signed-off-by: Igor Ryzhov <iryzhov@nfware.com>

babeld/babeld.c

@@ -819,6 +819,8 @@ babeld_quagga_init(void)
     install_element(BABEL_NODE, &babel_ipv6_distribute_list_cmd);
     install_element(BABEL_NODE, &babel_no_ipv6_distribute_list_cmd);
 
+    vrf_cmd_init(NULL, &babeld_privs);
+
     babel_if_init();
 
     /* Access list install. */

eigrpd/eigrp_cli.c

@@ -919,6 +919,8 @@ eigrp_cli_init(void)
 	install_element(EIGRP_NODE, &eigrp_neighbor_cmd);
 	install_element(EIGRP_NODE, &eigrp_redistribute_source_metric_cmd);
 
+	vrf_cmd_init(NULL, &eigrpd_privs);
+
 	install_node(&eigrp_interface_node);
 	if_cmd_init();
 

isisd/isisd.c

@@ -716,6 +716,8 @@ void isis_vrf_init(void)
 {
 	vrf_init(isis_vrf_new, isis_vrf_enable, isis_vrf_disable,
 		 isis_vrf_delete, isis_vrf_enable);
+
+	vrf_cmd_init(NULL, &isisd_privs);
 }
 
 void isis_terminate()

lib/vrf.c

@@ -827,10 +827,24 @@ DEFUN_YANG (no_vrf,
 		return CMD_WARNING_CONFIG_FAILED;
 	}
 
+	if (vrf_get_backend() == VRF_BACKEND_VRF_LITE) {
+		/*
+		 * Remove the VRF interface config. Currently, we allow to
+		 * remove only inactive VRFs, so we use VRF_DEFAULT_NAME here,
+		 * because when the VRF is removed from kernel, the interface
+		 * is moved to the default VRF. If we ever allow removing
+		 * active VRFs, this code have to be updated accordingly.
+		 */
+		snprintf(xpath_list, sizeof(xpath_list),
+			 "/frr-interface:lib/interface[name='%s'][vrf='%s']",
+			 vrfname, VRF_DEFAULT_NAME);
+		nb_cli_enqueue_change(vty, xpath_list, NB_OP_DESTROY, NULL);
+	}
+
 	snprintf(xpath_list, sizeof(xpath_list), FRR_VRF_KEY_XPATH, vrfname);
 
 	nb_cli_enqueue_change(vty, xpath_list, NB_OP_DESTROY, NULL);
-	return nb_cli_apply_changes(vty, xpath_list);
+	return nb_cli_apply_changes(vty, NULL);
 }
 
 

nhrpd/nhrp_main.c

@@ -118,6 +118,7 @@ static struct quagga_signal_t sighandlers[] = {
 static const struct frr_yang_module_info *const nhrpd_yang_modules[] = {
 	&frr_filter_info,
 	&frr_interface_info,
+	&frr_vrf_info,
 };
 
 FRR_DAEMON_INFO(nhrpd, NHRP, .vty_port = NHRP_VTY_PORT,

nhrpd/nhrp_vty.c

@@ -1260,6 +1260,8 @@ void nhrp_config_init(void)
 	install_element(CONFIG_NODE, &nhrp_multicast_nflog_group_cmd);
 	install_element(CONFIG_NODE, &no_nhrp_multicast_nflog_group_cmd);
 
+	vrf_cmd_init(NULL, &nhrpd_privs);
+
 	/* interface specific commands */
 	install_node(&nhrp_interface_node);
 

ospf6d/ospf6_top.c

@@ -232,6 +232,8 @@ void ospf6_vrf_init(void)
 {
 	vrf_init(ospf6_vrf_new, ospf6_vrf_enable, ospf6_vrf_disable,
 		 ospf6_vrf_delete, ospf6_vrf_enable);
+
+	vrf_cmd_init(NULL, &ospf6d_privs);
 }
 
 static void ospf6_top_lsdb_hook_add(struct ospf6_lsa *lsa)

ospfd/ospf_vty.c

@@ -12959,6 +12959,8 @@ void ospf_vty_init(void)
 	install_element(OSPF_NODE, &ospf_max_multipath_cmd);
 	install_element(OSPF_NODE, &no_ospf_max_multipath_cmd);
 
+	vrf_cmd_init(NULL, &ospfd_privs);
+
 	/* Init interface related vty commands. */
 	ospf_vty_if_init();
 

pbrd/pbr_main.c

@@ -119,6 +119,7 @@ struct quagga_signal_t pbr_signals[] = {
 static const struct frr_yang_module_info *const pbrd_yang_modules[] = {
 	&frr_filter_info,
 	&frr_interface_info,
+	&frr_vrf_info,
 };
 
 FRR_DAEMON_INFO(pbrd, PBR, .vty_port = PBR_VTY_PORT,

pbrd/pbr_vty.c

@@ -1143,10 +1143,14 @@ static const struct cmd_variable_handler pbr_map_name[] = {
 	}
 };
 
+extern struct zebra_privs_t pbr_privs;
+
 void pbr_vty_init(void)
 {
 	cmd_variable_handler_register(pbr_map_name);
 
+	vrf_cmd_init(NULL, &pbr_privs);
+
 	install_node(&interface_node);
 	if_cmd_init();
 

ripd/ripd.c

@@ -3690,6 +3690,8 @@ void rip_vrf_init(void)
 {
 	vrf_init(rip_vrf_new, rip_vrf_enable, rip_vrf_disable, rip_vrf_delete,
 		 rip_vrf_enable);
+
+	vrf_cmd_init(NULL, &ripd_privs);
 }
 
 void rip_vrf_terminate(void)

ripngd/ripngd.c

@@ -2691,6 +2691,8 @@ void ripng_vrf_init(void)
 {
 	vrf_init(ripng_vrf_new, ripng_vrf_enable, ripng_vrf_disable,
 		 ripng_vrf_delete, ripng_vrf_enable);
+
+	vrf_cmd_init(NULL, &ripngd_privs);
 }
 
 void ripng_vrf_terminate(void)

vrrpd/vrrp_vty.c

@@ -771,6 +771,7 @@ void vrrp_vty_init(void)
 	install_node(&debug_node);
 	install_node(&interface_node);
 	install_node(&vrrp_node);
+	vrf_cmd_init(NULL, &vrrp_privs);
 	if_cmd_init();
 
 	install_element(VIEW_NODE, &vrrp_vrid_show_cmd);

vtysh/vtysh.h

@@ -56,7 +56,7 @@ DECLARE_MGROUP(MVTYSH);
 #define VTYSH_ACL         VTYSH_BFDD|VTYSH_BABELD|VTYSH_BGPD|VTYSH_EIGRPD|VTYSH_ISISD|VTYSH_FABRICD|VTYSH_LDPD|VTYSH_NHRPD|VTYSH_OSPF6D|VTYSH_OSPFD|VTYSH_PBRD|VTYSH_PIMD|VTYSH_RIPD|VTYSH_RIPNGD|VTYSH_VRRPD|VTYSH_ZEBRA
 #define VTYSH_RMAP	  VTYSH_ZEBRA|VTYSH_RIPD|VTYSH_RIPNGD|VTYSH_OSPFD|VTYSH_OSPF6D|VTYSH_BGPD|VTYSH_ISISD|VTYSH_PIMD|VTYSH_EIGRPD|VTYSH_FABRICD
 #define VTYSH_INTERFACE	  VTYSH_ZEBRA|VTYSH_RIPD|VTYSH_RIPNGD|VTYSH_OSPFD|VTYSH_OSPF6D|VTYSH_ISISD|VTYSH_PIMD|VTYSH_NHRPD|VTYSH_EIGRPD|VTYSH_BABELD|VTYSH_PBRD|VTYSH_FABRICD|VTYSH_VRRPD
-#define VTYSH_VRF	  VTYSH_ZEBRA|VTYSH_PIMD|VTYSH_STATICD
+#define VTYSH_VRF	  VTYSH_INTERFACE|VTYSH_STATICD
 #define VTYSH_KEYS        VTYSH_RIPD|VTYSH_EIGRPD
 /* Daemons who can process nexthop-group configs */
 #define VTYSH_NH_GROUP    VTYSH_PBRD|VTYSH_SHARPD