Adding upstream version 8.4.4.upstream/8.4.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1159 insertions, 0 deletions

diff --git a/ripd/rip_interface.c b/ripd/rip_interface.c
new file mode 100644
index 0000000..02da56e
--- /dev/null
+++ b/ripd/rip_interface.c
@@ -0,0 +1,1159 @@
+/* Interface related function for RIP.
+ * Copyright (C) 1997, 98 Kunihiro Ishiguro <kunihiro@zebra.org>
+ *
+ * This file is part of GNU Zebra.
+ *
+ * GNU Zebra is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * GNU Zebra is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; see the file COPYING; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <zebra.h>
+
+#include "command.h"
+#include "if.h"
+#include "sockunion.h"
+#include "prefix.h"
+#include "memory.h"
+#include "network.h"
+#include "table.h"
+#include "log.h"
+#include "stream.h"
+#include "thread.h"
+#include "zclient.h"
+#include "filter.h"
+#include "sockopt.h"
+#include "privs.h"
+#include "lib_errors.h"
+#include "northbound_cli.h"
+
+#include "zebra/connected.h"
+
+#include "ripd/ripd.h"
+#include "ripd/rip_debug.h"
+#include "ripd/rip_interface.h"
+
+DEFINE_MTYPE_STATIC(RIPD, RIP_INTERFACE, "RIP interface");
+DEFINE_MTYPE(RIPD, RIP_INTERFACE_STRING, "RIP Interface String");
+DEFINE_HOOK(rip_ifaddr_add, (struct connected * ifc), (ifc));
+DEFINE_HOOK(rip_ifaddr_del, (struct connected * ifc), (ifc));
+
+/* static prototypes */
+static void rip_enable_apply(struct interface *);
+static void rip_passive_interface_apply(struct interface *);
+static int rip_if_down(struct interface *ifp);
+static int rip_enable_if_lookup(struct rip *rip, const char *ifname);
+static int rip_enable_network_lookup2(struct connected *connected);
+static void rip_enable_apply_all(struct rip *rip);
+
+const struct message ri_version_msg[] = {{RI_RIP_VERSION_1, "1"},
+					 {RI_RIP_VERSION_2, "2"},
+					 {RI_RIP_VERSION_1_AND_2, "1 2"},
+					 {RI_RIP_VERSION_NONE, "none"},
+					 {0}};
+
+/* Join to the RIP version 2 multicast group. */
+static int ipv4_multicast_join(int sock, struct in_addr group,
+			       struct in_addr ifa, ifindex_t ifindex)
+{
+	int ret;
+
+	ret = setsockopt_ipv4_multicast(sock, IP_ADD_MEMBERSHIP, ifa,
+					group.s_addr, ifindex);
+
+	if (ret < 0)
+		zlog_info("can't setsockopt IP_ADD_MEMBERSHIP %s",
+			  safe_strerror(errno));
+
+	return ret;
+}
+
+/* Leave from the RIP version 2 multicast group. */
+static int ipv4_multicast_leave(int sock, struct in_addr group,
+				struct in_addr ifa, ifindex_t ifindex)
+{
+	int ret;
+
+	ret = setsockopt_ipv4_multicast(sock, IP_DROP_MEMBERSHIP, ifa,
+					group.s_addr, ifindex);
+
+	if (ret < 0)
+		zlog_info("can't setsockopt IP_DROP_MEMBERSHIP");
+
+	return ret;
+}
+
+static void rip_interface_reset(struct rip_interface *);
+
+/* Allocate new RIP's interface configuration. */
+static struct rip_interface *rip_interface_new(void)
+{
+	struct rip_interface *ri;
+
+	ri = XCALLOC(MTYPE_RIP_INTERFACE, sizeof(struct rip_interface));
+
+	rip_interface_reset(ri);
+
+	return ri;
+}
+
+void rip_interface_multicast_set(int sock, struct connected *connected)
+{
+	struct in_addr addr;
+
+	assert(connected != NULL);
+
+	addr = CONNECTED_ID(connected)->u.prefix4;
+
+	if (setsockopt_ipv4_multicast_if(sock, addr, connected->ifp->ifindex)
+	    < 0) {
+		zlog_warn(
+			"Can't setsockopt IP_MULTICAST_IF on fd %d to ifindex %d for interface %s",
+			sock, connected->ifp->ifindex, connected->ifp->name);
+	}
+
+	return;
+}
+
+/* Send RIP request packet to specified interface. */
+static void rip_request_interface_send(struct interface *ifp, uint8_t version)
+{
+	struct sockaddr_in to;
+
+	/* RIPv2 support multicast. */
+	if (version == RIPv2 && if_is_multicast(ifp)) {
+
+		if (IS_RIP_DEBUG_EVENT)
+			zlog_debug("multicast request on %s", ifp->name);
+
+		rip_request_send(NULL, ifp, version, NULL);
+		return;
+	}
+
+	/* RIPv1 and non multicast interface. */
+	if (if_is_pointopoint(ifp) || if_is_broadcast(ifp)) {
+		struct listnode *cnode, *cnnode;
+		struct connected *connected;
+
+		if (IS_RIP_DEBUG_EVENT)
+			zlog_debug("broadcast request to %s", ifp->name);
+
+		for (ALL_LIST_ELEMENTS(ifp->connected, cnode, cnnode,
+				       connected)) {
+			if (connected->address->family != AF_INET)
+				continue;
+
+			memset(&to, 0, sizeof(struct sockaddr_in));
+			to.sin_port = htons(RIP_PORT_DEFAULT);
+			if (connected->destination)
+				/* use specified broadcast or peer
+				 * destination addr */
+				to.sin_addr = connected->destination->u.prefix4;
+			else if (connected->address->prefixlen
+				 < IPV4_MAX_BITLEN)
+				/* calculate the appropriate broadcast
+				 * address */
+				to.sin_addr.s_addr = ipv4_broadcast_addr(
+					connected->address->u.prefix4.s_addr,
+					connected->address->prefixlen);
+			else
+				/* do not know where to send the packet
+				 */
+				continue;
+
+			if (IS_RIP_DEBUG_EVENT)
+				zlog_debug("SEND request to %pI4",
+					   &to.sin_addr);
+
+			rip_request_send(&to, ifp, version, connected);
+		}
+	}
+}
+
+/* This will be executed when interface goes up. */
+static void rip_request_interface(struct interface *ifp)
+{
+	struct rip_interface *ri;
+	int vsend;
+
+	/* In default ripd doesn't send RIP_REQUEST to the loopback interface.
+	 */
+	if (if_is_loopback(ifp))
+		return;
+
+	/* If interface is down, don't send RIP packet. */
+	if (!if_is_operative(ifp))
+		return;
+
+	/* Fetch RIP interface information. */
+	ri = ifp->info;
+
+	/* If there is no version configuration in the interface,
+	   use rip's version setting. */
+	vsend = ((ri->ri_send == RI_RIP_UNSPEC) ? ri->rip->version_send
+						: ri->ri_send);
+	if (vsend & RIPv1)
+		rip_request_interface_send(ifp, RIPv1);
+	if (vsend & RIPv2)
+		rip_request_interface_send(ifp, RIPv2);
+}
+
+/* Multicast packet receive socket. */
+static int rip_multicast_join(struct interface *ifp, int sock)
+{
+	struct listnode *cnode;
+	struct connected *ifc;
+
+	if (if_is_operative(ifp) && if_is_multicast(ifp)) {
+		if (IS_RIP_DEBUG_EVENT)
+			zlog_debug("multicast join at %s", ifp->name);
+
+		for (ALL_LIST_ELEMENTS_RO(ifp->connected, cnode, ifc)) {
+			struct prefix_ipv4 *p;
+			struct in_addr group;
+
+			p = (struct prefix_ipv4 *)ifc->address;
+
+			if (p->family != AF_INET)
+				continue;
+
+			group.s_addr = htonl(INADDR_RIP_GROUP);
+			if (ipv4_multicast_join(sock, group, p->prefix,
+						ifp->ifindex)
+			    < 0)
+				return -1;
+			else
+				return 0;
+		}
+	}
+	return 0;
+}
+
+/* Leave from multicast group. */
+static void rip_multicast_leave(struct interface *ifp, int sock)
+{
+	struct listnode *cnode;
+	struct connected *connected;
+
+	if (if_is_up(ifp) && if_is_multicast(ifp)) {
+		if (IS_RIP_DEBUG_EVENT)
+			zlog_debug("multicast leave from %s", ifp->name);
+
+		for (ALL_LIST_ELEMENTS_RO(ifp->connected, cnode, connected)) {
+			struct prefix_ipv4 *p;
+			struct in_addr group;
+
+			p = (struct prefix_ipv4 *)connected->address;
+
+			if (p->family != AF_INET)
+				continue;
+
+			group.s_addr = htonl(INADDR_RIP_GROUP);
+			if (ipv4_multicast_leave(sock, group, p->prefix,
+						 ifp->ifindex)
+			    == 0)
+				return;
+		}
+	}
+}
+
+/* Is there and address on interface that I could use ? */
+static int rip_if_ipv4_address_check(struct interface *ifp)
+{
+	struct listnode *nn;
+	struct connected *connected;
+	int count = 0;
+
+	for (ALL_LIST_ELEMENTS_RO(ifp->connected, nn, connected)) {
+		struct prefix *p;
+
+		p = connected->address;
+
+		if (p->family == AF_INET)
+			count++;
+	}
+
+	return count;
+}
+
+
+/* Does this address belongs to me ? */
+int if_check_address(struct rip *rip, struct in_addr addr)
+{
+	struct interface *ifp;
+
+	FOR_ALL_INTERFACES (rip->vrf, ifp) {
+		struct listnode *cnode;
+		struct connected *connected;
+
+		for (ALL_LIST_ELEMENTS_RO(ifp->connected, cnode, connected)) {
+			struct prefix_ipv4 *p;
+
+			p = (struct prefix_ipv4 *)connected->address;
+
+			if (p->family != AF_INET)
+				continue;
+
+			if (IPV4_ADDR_CMP(&p->prefix, &addr) == 0)
+				return 1;
+		}
+	}
+	return 0;
+}
+
+/* Interface link down message processing. */
+static int rip_ifp_down(struct interface *ifp)
+{
+	rip_interface_sync(ifp);
+	rip_if_down(ifp);
+
+	if (IS_RIP_DEBUG_ZEBRA)
+		zlog_debug(
+			"interface %s vrf %s(%u) index %d flags %llx metric %d mtu %d is down",
+			ifp->name, ifp->vrf->name, ifp->vrf->vrf_id,
+			ifp->ifindex, (unsigned long long)ifp->flags,
+			ifp->metric, ifp->mtu);
+
+	return 0;
+}
+
+/* Interface link up message processing */
+static int rip_ifp_up(struct interface *ifp)
+{
+	if (IS_RIP_DEBUG_ZEBRA)
+		zlog_debug(
+			"interface %s vrf %s(%u) index %d flags %#llx metric %d mtu %d is up",
+			ifp->name, ifp->vrf->name, ifp->vrf->vrf_id,
+			ifp->ifindex, (unsigned long long)ifp->flags,
+			ifp->metric, ifp->mtu);
+
+	rip_interface_sync(ifp);
+
+	/* Check if this interface is RIP enabled or not.*/
+	rip_enable_apply(ifp);
+
+	/* Check for a passive interface */
+	rip_passive_interface_apply(ifp);
+
+	/* Apply distribute list to the all interface. */
+	rip_distribute_update_interface(ifp);
+
+	return 0;
+}
+
+/* Interface addition message from zebra. */
+static int rip_ifp_create(struct interface *ifp)
+{
+	rip_interface_sync(ifp);
+
+	if (IS_RIP_DEBUG_ZEBRA)
+		zlog_debug(
+			"interface add %s vrf %s(%u) index %d flags %#llx metric %d mtu %d",
+			ifp->name, ifp->vrf->name, ifp->vrf->vrf_id,
+			ifp->ifindex, (unsigned long long)ifp->flags,
+			ifp->metric, ifp->mtu);
+
+	/* Check if this interface is RIP enabled or not.*/
+	rip_enable_apply(ifp);
+
+	/* Check for a passive interface */
+	rip_passive_interface_apply(ifp);
+
+	/* Apply distribute list to the all interface. */
+	rip_distribute_update_interface(ifp);
+
+	/* rip_request_neighbor_all (); */
+
+	/* Check interface routemap. */
+	rip_if_rmap_update_interface(ifp);
+
+	return 0;
+}
+
+static int rip_ifp_destroy(struct interface *ifp)
+{
+	rip_interface_sync(ifp);
+	if (if_is_up(ifp)) {
+		rip_if_down(ifp);
+	}
+
+	if (IS_RIP_DEBUG_ZEBRA)
+		zlog_debug(
+			"interface delete %s vrf %s(%u) index %d flags %#llx metric %d mtu %d",
+			ifp->name, ifp->vrf->name, ifp->vrf->vrf_id,
+			ifp->ifindex, (unsigned long long)ifp->flags,
+			ifp->metric, ifp->mtu);
+
+	return 0;
+}
+
+/* VRF update for an interface. */
+int rip_interface_vrf_update(ZAPI_CALLBACK_ARGS)
+{
+	struct interface *ifp;
+	vrf_id_t new_vrf_id;
+
+	ifp = zebra_interface_vrf_update_read(zclient->ibuf, vrf_id,
+					      &new_vrf_id);
+	if (!ifp)
+		return 0;
+
+	if (IS_RIP_DEBUG_ZEBRA) {
+		struct vrf *nvrf = vrf_lookup_by_id(new_vrf_id);
+
+		zlog_debug("interface %s VRF change vrf %s(%u) new vrf %s(%u)",
+			   ifp->name, ifp->vrf->name, vrf_id, VRF_LOGNAME(nvrf),
+			   new_vrf_id);
+	}
+
+	if_update_to_new_vrf(ifp, new_vrf_id);
+	rip_interface_sync(ifp);
+
+	return 0;
+}
+
+static void rip_interface_clean(struct rip_interface *ri)
+{
+	ri->enable_network = 0;
+	ri->enable_interface = 0;
+	ri->running = 0;
+
+	THREAD_OFF(ri->t_wakeup);
+}
+
+void rip_interfaces_clean(struct rip *rip)
+{
+	struct interface *ifp;
+
+	FOR_ALL_INTERFACES (rip->vrf, ifp)
+		rip_interface_clean(ifp->info);
+}
+
+static void rip_interface_reset(struct rip_interface *ri)
+{
+	ri->auth_type = yang_get_default_enum("%s/authentication-scheme/mode",
+					      RIP_IFACE);
+	ri->md5_auth_len = yang_get_default_enum(
+		"%s/authentication-scheme/md5-auth-length", RIP_IFACE);
+
+	/* Set default split-horizon behavior.  If the interface is Frame
+	   Relay or SMDS is enabled, the default value for split-horizon is
+	   off.  But currently Zebra does detect Frame Relay or SMDS
+	   interface.  So all interface is set to split horizon.  */
+	ri->split_horizon =
+		yang_get_default_enum("%s/split-horizon", RIP_IFACE);
+
+	ri->ri_send = yang_get_default_enum("%s/version-send", RIP_IFACE);
+	ri->ri_receive = yang_get_default_enum("%s/version-receive", RIP_IFACE);
+	ri->v2_broadcast = yang_get_default_bool("%s/v2-broadcast", RIP_IFACE);
+
+	XFREE(MTYPE_RIP_INTERFACE_STRING, ri->auth_str);
+
+	XFREE(MTYPE_RIP_INTERFACE_STRING, ri->key_chain);
+
+	ri->list[RIP_FILTER_IN] = NULL;
+	ri->list[RIP_FILTER_OUT] = NULL;
+
+	ri->prefix[RIP_FILTER_IN] = NULL;
+	ri->prefix[RIP_FILTER_OUT] = NULL;
+
+	ri->recv_badpackets = 0;
+	ri->recv_badroutes = 0;
+	ri->sent_updates = 0;
+
+	ri->passive = 0;
+
+	rip_interface_clean(ri);
+}
+
+int rip_if_down(struct interface *ifp)
+{
+	struct rip *rip;
+	struct route_node *rp;
+	struct rip_info *rinfo;
+	struct rip_interface *ri = NULL;
+	struct list *list = NULL;
+	struct listnode *listnode = NULL, *nextnode = NULL;
+
+	ri = ifp->info;
+
+	THREAD_OFF(ri->t_wakeup);
+
+	rip = ri->rip;
+	if (rip) {
+		for (rp = route_top(rip->table); rp; rp = route_next(rp))
+			if ((list = rp->info) != NULL)
+				for (ALL_LIST_ELEMENTS(list, listnode, nextnode,
+						       rinfo))
+					if (rinfo->nh.ifindex == ifp->ifindex)
+						rip_ecmp_delete(rip, rinfo);
+
+		if (ri->running) {
+			if (IS_RIP_DEBUG_EVENT)
+				zlog_debug("turn off %s", ifp->name);
+
+			/* Leave from multicast group. */
+			rip_multicast_leave(ifp, rip->sock);
+
+			ri->running = 0;
+		}
+	}
+
+	return 0;
+}
+
+static void rip_apply_address_add(struct connected *ifc)
+{
+	struct rip_interface *ri = ifc->ifp->info;
+	struct rip *rip = ri->rip;
+	struct prefix_ipv4 address;
+	struct nexthop nh;
+	struct prefix *p;
+
+	if (!rip)
+		return;
+
+	if (!if_is_up(ifc->ifp))
+		return;
+
+	p = ifc->address;
+
+	memset(&address, 0, sizeof(address));
+	memset(&nh, 0, sizeof(nh));
+
+	address.family = p->family;
+	address.prefix = p->u.prefix4;
+	address.prefixlen = p->prefixlen;
+	apply_mask_ipv4(&address);
+
+	nh.ifindex = ifc->ifp->ifindex;
+	nh.type = NEXTHOP_TYPE_IFINDEX;
+
+	/* Check if this interface is RIP enabled or not
+	   or  Check if this address's prefix is RIP enabled */
+	if ((rip_enable_if_lookup(rip, ifc->ifp->name) >= 0)
+	    || (rip_enable_network_lookup2(ifc) >= 0))
+		rip_redistribute_add(rip, ZEBRA_ROUTE_CONNECT,
+				     RIP_ROUTE_INTERFACE, &address, &nh, 0, 0,
+				     0);
+}
+
+int rip_interface_address_add(ZAPI_CALLBACK_ARGS)
+{
+	struct connected *ifc;
+	struct prefix *p;
+
+	ifc = zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_ADD,
+					   zclient->ibuf, vrf_id);
+
+	if (ifc == NULL)
+		return 0;
+
+	p = ifc->address;
+
+	if (p->family == AF_INET) {
+		if (IS_RIP_DEBUG_ZEBRA)
+			zlog_debug("connected address %pFX is added", p);
+
+		rip_enable_apply(ifc->ifp);
+		/* Check if this prefix needs to be redistributed */
+		rip_apply_address_add(ifc);
+
+		hook_call(rip_ifaddr_add, ifc);
+	}
+
+	return 0;
+}
+
+static void rip_apply_address_del(struct connected *ifc)
+{
+	struct rip_interface *ri = ifc->ifp->info;
+	struct rip *rip = ri->rip;
+	struct prefix_ipv4 address;
+	struct prefix *p;
+
+	if (!rip)
+		return;
+
+	if (!if_is_up(ifc->ifp))
+		return;
+
+	p = ifc->address;
+
+	memset(&address, 0, sizeof(address));
+	address.family = p->family;
+	address.prefix = p->u.prefix4;
+	address.prefixlen = p->prefixlen;
+	apply_mask_ipv4(&address);
+
+	rip_redistribute_delete(rip, ZEBRA_ROUTE_CONNECT, RIP_ROUTE_INTERFACE,
+				&address, ifc->ifp->ifindex);
+}
+
+int rip_interface_address_delete(ZAPI_CALLBACK_ARGS)
+{
+	struct connected *ifc;
+	struct prefix *p;
+
+	ifc = zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_DELETE,
+					   zclient->ibuf, vrf_id);
+
+	if (ifc) {
+		p = ifc->address;
+		if (p->family == AF_INET) {
+			if (IS_RIP_DEBUG_ZEBRA)
+				zlog_debug("connected address %pFX is deleted",
+					   p);
+
+			hook_call(rip_ifaddr_del, ifc);
+
+			/* Chech whether this prefix needs to be removed */
+			rip_apply_address_del(ifc);
+		}
+
+		connected_free(&ifc);
+	}
+
+	return 0;
+}
+
+/* Check interface is enabled by network statement. */
+/* Check whether the interface has at least a connected prefix that
+ * is within the ripng_enable_network table. */
+static int rip_enable_network_lookup_if(struct interface *ifp)
+{
+	struct rip_interface *ri = ifp->info;
+	struct rip *rip = ri->rip;
+	struct listnode *node, *nnode;
+	struct connected *connected;
+	struct prefix_ipv4 address;
+
+	if (!rip)
+		return -1;
+
+	for (ALL_LIST_ELEMENTS(ifp->connected, node, nnode, connected)) {
+		struct prefix *p;
+		struct route_node *n;
+
+		p = connected->address;
+
+		if (p->family == AF_INET) {
+			address.family = AF_INET;
+			address.prefix = p->u.prefix4;
+			address.prefixlen = IPV4_MAX_BITLEN;
+
+			n = route_node_match(rip->enable_network,
+					     (struct prefix *)&address);
+			if (n) {
+				route_unlock_node(n);
+				return 1;
+			}
+		}
+	}
+	return -1;
+}
+
+/* Check whether connected is within the ripng_enable_network table. */
+static int rip_enable_network_lookup2(struct connected *connected)
+{
+	struct rip_interface *ri = connected->ifp->info;
+	struct rip *rip = ri->rip;
+	struct prefix_ipv4 address;
+	struct prefix *p;
+
+	p = connected->address;
+
+	if (p->family == AF_INET) {
+		struct route_node *node;
+
+		address.family = p->family;
+		address.prefix = p->u.prefix4;
+		address.prefixlen = IPV4_MAX_BITLEN;
+
+		/* LPM on p->family, p->u.prefix4/IPV4_MAX_BITLEN within
+		 * rip->enable_network */
+		node = route_node_match(rip->enable_network,
+					(struct prefix *)&address);
+
+		if (node) {
+			route_unlock_node(node);
+			return 1;
+		}
+	}
+
+	return -1;
+}
+/* Add RIP enable network. */
+int rip_enable_network_add(struct rip *rip, struct prefix *p)
+{
+	struct route_node *node;
+
+	node = route_node_get(rip->enable_network, p);
+
+	if (node->info) {
+		route_unlock_node(node);
+		return NB_ERR_INCONSISTENCY;
+	} else
+		node->info = (void *)1;
+
+	/* XXX: One should find a better solution than a generic one */
+	rip_enable_apply_all(rip);
+
+	return NB_OK;
+}
+
+/* Delete RIP enable network. */
+int rip_enable_network_delete(struct rip *rip, struct prefix *p)
+{
+	struct route_node *node;
+
+	node = route_node_lookup(rip->enable_network, p);
+	if (node) {
+		node->info = NULL;
+
+		/* Unlock info lock. */
+		route_unlock_node(node);
+
+		/* Unlock lookup lock. */
+		route_unlock_node(node);
+
+		/* XXX: One should find a better solution than a generic one */
+		rip_enable_apply_all(rip);
+
+		return NB_OK;
+	}
+
+	return NB_ERR_INCONSISTENCY;
+}
+
+/* Check interface is enabled by ifname statement. */
+static int rip_enable_if_lookup(struct rip *rip, const char *ifname)
+{
+	unsigned int i;
+	char *str;
+
+	if (!rip)
+		return -1;
+
+	for (i = 0; i < vector_active(rip->enable_interface); i++)
+		if ((str = vector_slot(rip->enable_interface, i)) != NULL)
+			if (strcmp(str, ifname) == 0)
+				return i;
+	return -1;
+}
+
+/* Add interface to rip_enable_if. */
+int rip_enable_if_add(struct rip *rip, const char *ifname)
+{
+	int ret;
+
+	ret = rip_enable_if_lookup(rip, ifname);
+	if (ret >= 0)
+		return NB_ERR_INCONSISTENCY;
+
+	vector_set(rip->enable_interface,
+		   XSTRDUP(MTYPE_RIP_INTERFACE_STRING, ifname));
+
+	rip_enable_apply_all(rip); /* TODOVJ */
+
+	return NB_OK;
+}
+
+/* Delete interface from rip_enable_if. */
+int rip_enable_if_delete(struct rip *rip, const char *ifname)
+{
+	int index;
+	char *str;
+
+	index = rip_enable_if_lookup(rip, ifname);
+	if (index < 0)
+		return NB_ERR_INCONSISTENCY;
+
+	str = vector_slot(rip->enable_interface, index);
+	XFREE(MTYPE_RIP_INTERFACE_STRING, str);
+	vector_unset(rip->enable_interface, index);
+
+	rip_enable_apply_all(rip); /* TODOVJ */
+
+	return NB_OK;
+}
+
+/* Join to multicast group and send request to the interface. */
+static void rip_interface_wakeup(struct thread *t)
+{
+	struct interface *ifp;
+	struct rip_interface *ri;
+
+	/* Get interface. */
+	ifp = THREAD_ARG(t);
+
+	ri = ifp->info;
+
+	/* Join to multicast group. */
+	if (rip_multicast_join(ifp, ri->rip->sock) < 0) {
+		flog_err_sys(EC_LIB_SOCKET,
+			     "multicast join failed, interface %s not running",
+			     ifp->name);
+		return;
+	}
+
+	/* Set running flag. */
+	ri->running = 1;
+
+	/* Send RIP request to the interface. */
+	rip_request_interface(ifp);
+}
+
+static void rip_connect_set(struct interface *ifp, int set)
+{
+	struct rip_interface *ri = ifp->info;
+	struct rip *rip = ri->rip;
+	struct listnode *node, *nnode;
+	struct connected *connected;
+	struct prefix_ipv4 address;
+	struct nexthop nh;
+
+	memset(&nh, 0, sizeof(nh));
+
+	for (ALL_LIST_ELEMENTS(ifp->connected, node, nnode, connected)) {
+		struct prefix *p;
+		p = connected->address;
+
+		if (p->family != AF_INET)
+			continue;
+
+		address.family = AF_INET;
+		address.prefix = p->u.prefix4;
+		address.prefixlen = p->prefixlen;
+		apply_mask_ipv4(&address);
+
+		nh.ifindex = connected->ifp->ifindex;
+		nh.type = NEXTHOP_TYPE_IFINDEX;
+		if (set) {
+			/* Check once more whether this prefix is within a
+			 * "network IF_OR_PREF" one */
+			if ((rip_enable_if_lookup(rip, connected->ifp->name)
+			     >= 0)
+			    || (rip_enable_network_lookup2(connected) >= 0))
+				rip_redistribute_add(rip, ZEBRA_ROUTE_CONNECT,
+						     RIP_ROUTE_INTERFACE,
+						     &address, &nh, 0, 0, 0);
+		} else {
+			rip_redistribute_delete(rip, ZEBRA_ROUTE_CONNECT,
+						RIP_ROUTE_INTERFACE, &address,
+						connected->ifp->ifindex);
+			if (rip_redistribute_check(rip, ZEBRA_ROUTE_CONNECT))
+				rip_redistribute_add(rip, ZEBRA_ROUTE_CONNECT,
+						     RIP_ROUTE_REDISTRIBUTE,
+						     &address, &nh, 0, 0, 0);
+		}
+	}
+}
+
+/* Update interface status. */
+void rip_enable_apply(struct interface *ifp)
+{
+	int ret;
+	struct rip_interface *ri = NULL;
+
+	/* Check interface. */
+	if (!if_is_operative(ifp))
+		return;
+
+	ri = ifp->info;
+
+	/* Check network configuration. */
+	ret = rip_enable_network_lookup_if(ifp);
+
+	/* If the interface is matched. */
+	if (ret > 0)
+		ri->enable_network = 1;
+	else
+		ri->enable_network = 0;
+
+	/* Check interface name configuration. */
+	ret = rip_enable_if_lookup(ri->rip, ifp->name);
+	if (ret >= 0)
+		ri->enable_interface = 1;
+	else
+		ri->enable_interface = 0;
+
+	/* any interface MUST have an IPv4 address */
+	if (!rip_if_ipv4_address_check(ifp)) {
+		ri->enable_network = 0;
+		ri->enable_interface = 0;
+	}
+
+	/* Update running status of the interface. */
+	if (ri->enable_network || ri->enable_interface) {
+		if (IS_RIP_DEBUG_EVENT)
+			zlog_debug("turn on %s", ifp->name);
+
+		/* Add interface wake up thread. */
+		thread_add_timer(master, rip_interface_wakeup, ifp, 1,
+				 &ri->t_wakeup);
+		rip_connect_set(ifp, 1);
+	} else if (ri->running) {
+		/* Might as well clean up the route table as well
+		 * rip_if_down sets to 0 ri->running, and displays "turn
+		 *off %s"
+		 **/
+		rip_if_down(ifp);
+
+		rip_connect_set(ifp, 0);
+	}
+}
+
+/* Apply network configuration to all interface. */
+static void rip_enable_apply_all(struct rip *rip)
+{
+	struct interface *ifp;
+
+	/* Check each interface. */
+	FOR_ALL_INTERFACES (rip->vrf, ifp)
+		rip_enable_apply(ifp);
+}
+
+int rip_neighbor_lookup(struct rip *rip, struct sockaddr_in *from)
+{
+	struct prefix_ipv4 p;
+	struct route_node *node;
+
+	memset(&p, 0, sizeof(p));
+	p.family = AF_INET;
+	p.prefix = from->sin_addr;
+	p.prefixlen = IPV4_MAX_BITLEN;
+
+	node = route_node_lookup(rip->neighbor, (struct prefix *)&p);
+	if (node) {
+		route_unlock_node(node);
+		return 1;
+	}
+	return 0;
+}
+
+/* Add new RIP neighbor to the neighbor tree. */
+int rip_neighbor_add(struct rip *rip, struct prefix_ipv4 *p)
+{
+	struct route_node *node;
+
+	node = route_node_get(rip->neighbor, (struct prefix *)p);
+
+	if (node->info)
+		return NB_ERR_INCONSISTENCY;
+
+	node->info = rip->neighbor;
+
+	return NB_OK;
+}
+
+/* Delete RIP neighbor from the neighbor tree. */
+int rip_neighbor_delete(struct rip *rip, struct prefix_ipv4 *p)
+{
+	struct route_node *node;
+
+	/* Lock for look up. */
+	node = route_node_lookup(rip->neighbor, (struct prefix *)p);
+	if (!node)
+		return NB_ERR_INCONSISTENCY;
+
+	node->info = NULL;
+
+	/* Unlock lookup lock. */
+	route_unlock_node(node);
+
+	/* Unlock real neighbor information lock. */
+	route_unlock_node(node);
+
+	return NB_OK;
+}
+
+/* Clear all network and neighbor configuration. */
+void rip_clean_network(struct rip *rip)
+{
+	unsigned int i;
+	char *str;
+	struct route_node *rn;
+
+	/* rip->enable_network. */
+	for (rn = route_top(rip->enable_network); rn; rn = route_next(rn))
+		if (rn->info) {
+			rn->info = NULL;
+			route_unlock_node(rn);
+		}
+
+	/* rip->enable_interface. */
+	for (i = 0; i < vector_active(rip->enable_interface); i++)
+		if ((str = vector_slot(rip->enable_interface, i)) != NULL) {
+			XFREE(MTYPE_RIP_INTERFACE_STRING, str);
+			vector_slot(rip->enable_interface, i) = NULL;
+		}
+}
+
+/* Utility function for looking up passive interface settings. */
+static int rip_passive_nondefault_lookup(struct rip *rip, const char *ifname)
+{
+	unsigned int i;
+	char *str;
+
+	for (i = 0; i < vector_active(rip->passive_nondefault); i++)
+		if ((str = vector_slot(rip->passive_nondefault, i)) != NULL)
+			if (strcmp(str, ifname) == 0)
+				return i;
+	return -1;
+}
+
+static void rip_passive_interface_apply(struct interface *ifp)
+{
+	struct rip *rip;
+	struct rip_interface *ri;
+
+	ri = ifp->info;
+	rip = ri->rip;
+	if (rip == NULL)
+		return;
+
+	ri->passive = ((rip_passive_nondefault_lookup(rip, ifp->name) < 0)
+			       ? rip->passive_default
+			       : !rip->passive_default);
+
+	if (IS_RIP_DEBUG_ZEBRA)
+		zlog_debug("interface %s: passive = %d", ifp->name,
+			   ri->passive);
+}
+
+static void rip_passive_interface_apply_all(struct rip *rip)
+{
+	struct interface *ifp;
+
+	FOR_ALL_INTERFACES (rip->vrf, ifp)
+		rip_passive_interface_apply(ifp);
+}
+
+/* Passive interface. */
+int rip_passive_nondefault_set(struct rip *rip, const char *ifname)
+{
+	if (rip_passive_nondefault_lookup(rip, ifname) >= 0)
+		/*
+		 * Don't return an error, this can happen after changing
+		 * 'passive-default'.
+		 */
+		return NB_OK;
+
+	vector_set(rip->passive_nondefault,
+		   XSTRDUP(MTYPE_RIP_INTERFACE_STRING, ifname));
+
+	rip_passive_interface_apply_all(rip);
+
+	return NB_OK;
+}
+
+int rip_passive_nondefault_unset(struct rip *rip, const char *ifname)
+{
+	int i;
+	char *str;
+
+	i = rip_passive_nondefault_lookup(rip, ifname);
+	if (i < 0)
+		/*
+		 * Don't return an error, this can happen after changing
+		 * 'passive-default'.
+		 */
+		return NB_OK;
+
+	str = vector_slot(rip->passive_nondefault, i);
+	XFREE(MTYPE_RIP_INTERFACE_STRING, str);
+	vector_unset(rip->passive_nondefault, i);
+
+	rip_passive_interface_apply_all(rip);
+
+	return NB_OK;
+}
+
+/* Free all configured RIP passive-interface settings. */
+void rip_passive_nondefault_clean(struct rip *rip)
+{
+	unsigned int i;
+	char *str;
+
+	for (i = 0; i < vector_active(rip->passive_nondefault); i++)
+		if ((str = vector_slot(rip->passive_nondefault, i)) != NULL) {
+			XFREE(MTYPE_RIP_INTERFACE_STRING, str);
+			vector_slot(rip->passive_nondefault, i) = NULL;
+		}
+	rip_passive_interface_apply_all(rip);
+}
+
+int rip_show_network_config(struct vty *vty, struct rip *rip)
+{
+	unsigned int i;
+	char *ifname;
+	struct route_node *node;
+
+	/* Network type RIP enable interface statement. */
+	for (node = route_top(rip->enable_network); node;
+	     node = route_next(node))
+		if (node->info)
+			vty_out(vty, "    %pFX\n", &node->p);
+
+	/* Interface name RIP enable statement. */
+	for (i = 0; i < vector_active(rip->enable_interface); i++)
+		if ((ifname = vector_slot(rip->enable_interface, i)) != NULL)
+			vty_out(vty, "    %s\n", ifname);
+
+	/* RIP neighbors listing. */
+	for (node = route_top(rip->neighbor); node; node = route_next(node))
+		if (node->info)
+			vty_out(vty, "    %pI4\n", &node->p.u.prefix4);
+
+	return 0;
+}
+
+void rip_interface_sync(struct interface *ifp)
+{
+	struct rip_interface *ri;
+
+	ri = ifp->info;
+	if (ri)
+		ri->rip = ifp->vrf->info;
+}
+
+/* Called when interface structure allocated. */
+static int rip_interface_new_hook(struct interface *ifp)
+{
+	ifp->info = rip_interface_new();
+	rip_interface_sync(ifp);
+
+	return 0;
+}
+
+/* Called when interface structure deleted. */
+static int rip_interface_delete_hook(struct interface *ifp)
+{
+	rip_interface_reset(ifp->info);
+	XFREE(MTYPE_RIP_INTERFACE, ifp->info);
+	return 0;
+}
+
+/* Allocate and initialize interface vector. */
+void rip_if_init(void)
+{
+	/* Default initial size of interface vector. */
+	hook_register_prio(if_add, 0, rip_interface_new_hook);
+	hook_register_prio(if_del, 0, rip_interface_delete_hook);
+
+	/* Install interface node. */
+	if_cmd_init_default();
+	if_zapi_callbacks(rip_ifp_create, rip_ifp_up,
+			  rip_ifp_down, rip_ifp_destroy);
+}