1 files changed, 882 insertions, 0 deletions

diff --git a/ripngd/ripng_interface.c b/ripngd/ripng_interface.c
new file mode 100644
index 0000000..4cb4bb5
--- /dev/null
+++ b/ripngd/ripng_interface.c
@@ -0,0 +1,882 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Interface related function for RIPng.
+ * Copyright (C) 1998 Kunihiro Ishiguro
+ */
+
+#include <zebra.h>
+
+#include "linklist.h"
+#include "if.h"
+#include "prefix.h"
+#include "memory.h"
+#include "network.h"
+#include "filter.h"
+#include "log.h"
+#include "stream.h"
+#include "zclient.h"
+#include "command.h"
+#include "agg_table.h"
+#include "frrevent.h"
+#include "privs.h"
+#include "vrf.h"
+#include "lib_errors.h"
+#include "northbound_cli.h"
+
+#include "ripngd/ripngd.h"
+#include "ripngd/ripng_debug.h"
+
+/* If RFC2133 definition is used. */
+#ifndef IPV6_JOIN_GROUP
+#define IPV6_JOIN_GROUP  IPV6_ADD_MEMBERSHIP
+#endif
+#ifndef IPV6_LEAVE_GROUP
+#define IPV6_LEAVE_GROUP IPV6_DROP_MEMBERSHIP
+#endif
+
+DEFINE_MTYPE_STATIC(RIPNGD, RIPNG_IF, "ripng interface");
+
+/* Static utility function. */
+static void ripng_enable_apply(struct interface *);
+static void ripng_passive_interface_apply(struct interface *);
+static int ripng_enable_if_lookup(struct ripng *ripng, const char *ifname);
+static int ripng_enable_network_lookup2(struct connected *);
+static void ripng_enable_apply_all(struct ripng *ripng);
+
+/* Join to the all rip routers multicast group. */
+static int ripng_multicast_join(struct interface *ifp, int sock)
+{
+	int ret;
+	struct ipv6_mreq mreq;
+	int save_errno;
+
+	if (if_is_multicast(ifp)) {
+		memset(&mreq, 0, sizeof(mreq));
+		inet_pton(AF_INET6, RIPNG_GROUP, &mreq.ipv6mr_multiaddr);
+		mreq.ipv6mr_interface = ifp->ifindex;
+
+		/*
+		 * NetBSD 1.6.2 requires root to join groups on gif(4).
+		 * While this is bogus, privs are available and easy to use
+		 * for this call as a workaround.
+		 */
+		frr_with_privs(&ripngd_privs) {
+
+			ret = setsockopt(sock, IPPROTO_IPV6, IPV6_JOIN_GROUP,
+					 (char *)&mreq, sizeof(mreq));
+			save_errno = errno;
+
+		}
+
+		if (ret < 0 && save_errno == EADDRINUSE) {
+			/*
+			 * Group is already joined.  This occurs due to sloppy
+			 * group
+			 * management, in particular declining to leave the
+			 * group on
+			 * an interface that has just gone down.
+			 */
+			zlog_warn("ripng join on %s EADDRINUSE (ignoring)",
+				  ifp->name);
+			return 0; /* not an error */
+		}
+
+		if (ret < 0)
+			zlog_warn("can't setsockopt IPV6_JOIN_GROUP: %s",
+				  safe_strerror(save_errno));
+
+		if (IS_RIPNG_DEBUG_EVENT)
+			zlog_debug(
+				"RIPng %s join to all-rip-routers multicast group",
+				ifp->name);
+
+		if (ret < 0)
+			return -1;
+	}
+	return 0;
+}
+
+/* Leave from the all rip routers multicast group. */
+static int ripng_multicast_leave(struct interface *ifp, int sock)
+{
+	int ret;
+	struct ipv6_mreq mreq;
+
+	if (if_is_multicast(ifp)) {
+		memset(&mreq, 0, sizeof(mreq));
+		inet_pton(AF_INET6, RIPNG_GROUP, &mreq.ipv6mr_multiaddr);
+		mreq.ipv6mr_interface = ifp->ifindex;
+
+		ret = setsockopt(sock, IPPROTO_IPV6, IPV6_LEAVE_GROUP,
+				 (char *)&mreq, sizeof(mreq));
+		if (ret < 0)
+			zlog_warn("can't setsockopt IPV6_LEAVE_GROUP: %s",
+				  safe_strerror(errno));
+
+		if (IS_RIPNG_DEBUG_EVENT)
+			zlog_debug(
+				"RIPng %s leave from all-rip-routers multicast group",
+				ifp->name);
+
+		if (ret < 0)
+			return -1;
+	}
+
+	return 0;
+}
+
+/* How many link local IPv6 address could be used on the interface ? */
+static int ripng_if_ipv6_lladdress_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_INET6) &&
+		    IN6_IS_ADDR_LINKLOCAL(&p->u.prefix6))
+			count++;
+	}
+
+	return count;
+}
+
+static int ripng_if_down(struct interface *ifp)
+{
+	struct agg_node *rp;
+	struct ripng_info *rinfo;
+	struct ripng_interface *ri;
+	struct ripng *ripng;
+	struct list *list = NULL;
+	struct listnode *listnode = NULL, *nextnode = NULL;
+
+	ri = ifp->info;
+
+	EVENT_OFF(ri->t_wakeup);
+
+	ripng = ri->ripng;
+
+	if (ripng)
+		for (rp = agg_route_top(ripng->table); rp;
+		     rp = agg_route_next(rp))
+			if ((list = rp->info) != NULL)
+				for (ALL_LIST_ELEMENTS(list, listnode, nextnode,
+						       rinfo))
+					if (rinfo->ifindex == ifp->ifindex)
+						ripng_ecmp_delete(ripng, rinfo);
+
+
+	if (ri->running) {
+		if (IS_RIPNG_DEBUG_EVENT)
+			zlog_debug("turn off %s", ifp->name);
+
+		/* Leave from multicast group. */
+		if (ripng)
+			ripng_multicast_leave(ifp, ripng->sock);
+
+		ri->running = 0;
+	}
+
+	return 0;
+}
+
+/* Interface link up message processing. */
+static int ripng_ifp_up(struct interface *ifp)
+{
+	if (IS_RIPNG_DEBUG_ZEBRA)
+		zlog_debug(
+			"interface up %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->mtu6);
+
+	ripng_interface_sync(ifp);
+
+	/* Check if this interface is RIPng enabled or not. */
+	ripng_enable_apply(ifp);
+
+	/* Check for a passive interface. */
+	ripng_passive_interface_apply(ifp);
+
+	/* Apply distribute list to the all interface. */
+	ripng_distribute_update_interface(ifp);
+
+	return 0;
+}
+
+/* Interface link down message processing. */
+static int ripng_ifp_down(struct interface *ifp)
+{
+	ripng_interface_sync(ifp);
+	ripng_if_down(ifp);
+
+	if (IS_RIPNG_DEBUG_ZEBRA)
+		zlog_debug(
+			"interface down %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->mtu6);
+
+	return 0;
+}
+
+/* Interface addition message from zebra. */
+static int ripng_ifp_create(struct interface *ifp)
+{
+	ripng_interface_sync(ifp);
+
+	if (IS_RIPNG_DEBUG_ZEBRA)
+		zlog_debug(
+			"RIPng 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->mtu6);
+
+	/* Check is this interface is RIP enabled or not.*/
+	ripng_enable_apply(ifp);
+
+	/* Apply distribute list to the interface. */
+	ripng_distribute_update_interface(ifp);
+
+	/* Check interface routemap. */
+	ripng_if_rmap_update_interface(ifp);
+
+	return 0;
+}
+
+static int ripng_ifp_destroy(struct interface *ifp)
+{
+	ripng_interface_sync(ifp);
+	if (if_is_up(ifp)) {
+		ripng_if_down(ifp);
+	}
+
+	if (IS_RIPNG_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->mtu6);
+
+	return 0;
+}
+
+void ripng_interface_clean(struct ripng *ripng)
+{
+	struct interface *ifp;
+	struct ripng_interface *ri;
+
+	FOR_ALL_INTERFACES (ripng->vrf, ifp) {
+		ri = ifp->info;
+
+		ri->enable_network = 0;
+		ri->enable_interface = 0;
+		ri->running = 0;
+
+		EVENT_OFF(ri->t_wakeup);
+	}
+}
+
+static void ripng_apply_address_add(struct connected *ifc)
+{
+	struct ripng_interface *ri = ifc->ifp->info;
+	struct ripng *ripng = ri->ripng;
+	struct prefix_ipv6 address;
+	struct prefix *p;
+
+	if (!ripng)
+		return;
+
+	if (!if_is_up(ifc->ifp))
+		return;
+
+	p = ifc->address;
+
+	memset(&address, 0, sizeof(address));
+	address.family = p->family;
+	address.prefix = p->u.prefix6;
+	address.prefixlen = p->prefixlen;
+	apply_mask_ipv6(&address);
+
+	/* Check if this interface is RIP enabled or not
+	   or  Check if this address's prefix is RIP enabled */
+	if ((ripng_enable_if_lookup(ripng, ifc->ifp->name) >= 0)
+	    || (ripng_enable_network_lookup2(ifc) >= 0))
+		ripng_redistribute_add(ripng, ZEBRA_ROUTE_CONNECT,
+				       RIPNG_ROUTE_INTERFACE, &address,
+				       ifc->ifp->ifindex, NULL, 0);
+}
+
+int ripng_interface_address_add(ZAPI_CALLBACK_ARGS)
+{
+	struct connected *c;
+	struct prefix *p;
+
+	c = zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_ADD,
+					 zclient->ibuf, vrf_id);
+
+	if (c == NULL)
+		return 0;
+
+	p = c->address;
+
+	if (p->family == AF_INET6) {
+		struct ripng_interface *ri = c->ifp->info;
+
+		if (IS_RIPNG_DEBUG_ZEBRA)
+			zlog_debug("RIPng connected address %pFX add", p);
+
+		/* Check is this prefix needs to be redistributed. */
+		ripng_apply_address_add(c);
+
+		/* Let's try once again whether the interface could be activated
+		 */
+		if (!ri->running) {
+			/* Check if this interface is RIP enabled or not.*/
+			ripng_enable_apply(c->ifp);
+
+			/* Apply distribute list to the interface. */
+			ripng_distribute_update_interface(c->ifp);
+
+			/* Check interface routemap. */
+			ripng_if_rmap_update_interface(c->ifp);
+		}
+	}
+
+	return 0;
+}
+
+static void ripng_apply_address_del(struct connected *ifc)
+{
+	struct ripng_interface *ri = ifc->ifp->info;
+	struct ripng *ripng = ri->ripng;
+	struct prefix_ipv6 address;
+	struct prefix *p;
+
+	if (!ripng)
+		return;
+
+	if (!if_is_up(ifc->ifp))
+		return;
+
+	p = ifc->address;
+
+	memset(&address, 0, sizeof(address));
+	address.family = p->family;
+	address.prefix = p->u.prefix6;
+	address.prefixlen = p->prefixlen;
+	apply_mask_ipv6(&address);
+
+	ripng_redistribute_delete(ripng, ZEBRA_ROUTE_CONNECT,
+				  RIPNG_ROUTE_INTERFACE, &address,
+				  ifc->ifp->ifindex);
+}
+
+int ripng_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_INET6) {
+			if (IS_RIPNG_DEBUG_ZEBRA)
+				zlog_debug(
+					"RIPng connected address %pFX delete",
+					p);
+
+			/* Check whether this prefix needs to be removed. */
+			ripng_apply_address_del(ifc);
+		}
+		connected_free(&ifc);
+	}
+
+	return 0;
+}
+
+/* Lookup RIPng enable network. */
+/* Check whether the interface has at least a connected prefix that
+ * is within the ripng->enable_network table. */
+static int ripng_enable_network_lookup_if(struct interface *ifp)
+{
+	struct ripng_interface *ri = ifp->info;
+	struct ripng *ripng = ri->ripng;
+	struct listnode *node;
+	struct connected *connected;
+	struct prefix_ipv6 address;
+
+	if (!ripng)
+		return -1;
+
+	for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, connected)) {
+		struct prefix *p;
+		struct agg_node *n;
+
+		p = connected->address;
+
+		if (p->family == AF_INET6) {
+			address.family = AF_INET6;
+			address.prefix = p->u.prefix6;
+			address.prefixlen = IPV6_MAX_BITLEN;
+
+			n = agg_node_match(ripng->enable_network,
+					   (struct prefix *)&address);
+			if (n) {
+				agg_unlock_node(n);
+				return 1;
+			}
+		}
+	}
+	return -1;
+}
+
+/* Check whether connected is within the ripng->enable_network table. */
+static int ripng_enable_network_lookup2(struct connected *connected)
+{
+	struct ripng_interface *ri = connected->ifp->info;
+	struct ripng *ripng = ri->ripng;
+	struct prefix_ipv6 address;
+	struct prefix *p;
+
+	if (!ripng)
+		return -1;
+
+	p = connected->address;
+
+	if (p->family == AF_INET6) {
+		struct agg_node *node;
+
+		address.family = p->family;
+		address.prefix = p->u.prefix6;
+		address.prefixlen = IPV6_MAX_BITLEN;
+
+		/* LPM on p->family, p->u.prefix6/IPV6_MAX_BITLEN within
+		 * ripng->enable_network */
+		node = agg_node_match(ripng->enable_network,
+				      (struct prefix *)&address);
+
+		if (node) {
+			agg_unlock_node(node);
+			return 1;
+		}
+	}
+
+	return -1;
+}
+
+/* Add RIPng enable network. */
+int ripng_enable_network_add(struct ripng *ripng, struct prefix *p)
+{
+	struct agg_node *node;
+
+	node = agg_node_get(ripng->enable_network, p);
+
+	if (node->info) {
+		agg_unlock_node(node);
+		return NB_ERR_INCONSISTENCY;
+	} else
+		node->info = (void *)1;
+
+	/* XXX: One should find a better solution than a generic one */
+	ripng_enable_apply_all(ripng);
+
+	return NB_OK;
+}
+
+/* Delete RIPng enable network. */
+int ripng_enable_network_delete(struct ripng *ripng, struct prefix *p)
+{
+	struct agg_node *node;
+
+	node = agg_node_lookup(ripng->enable_network, p);
+	if (node) {
+		node->info = NULL;
+
+		/* Unlock info lock. */
+		agg_unlock_node(node);
+
+		/* Unlock lookup lock. */
+		agg_unlock_node(node);
+
+		return NB_OK;
+	}
+
+	return NB_ERR_INCONSISTENCY;
+}
+
+/* Lookup function. */
+static int ripng_enable_if_lookup(struct ripng *ripng, const char *ifname)
+{
+	unsigned int i;
+	char *str;
+
+	if (!ripng)
+		return -1;
+
+	for (i = 0; i < vector_active(ripng->enable_if); i++)
+		if ((str = vector_slot(ripng->enable_if, i)) != NULL)
+			if (strcmp(str, ifname) == 0)
+				return i;
+	return -1;
+}
+
+int ripng_enable_if_add(struct ripng *ripng, const char *ifname)
+{
+	int ret;
+
+	ret = ripng_enable_if_lookup(ripng, ifname);
+	if (ret >= 0)
+		return NB_ERR_INCONSISTENCY;
+
+	vector_set(ripng->enable_if, strdup(ifname));
+
+	ripng_enable_apply_all(ripng);
+
+	return NB_OK;
+}
+
+int ripng_enable_if_delete(struct ripng *ripng, const char *ifname)
+{
+	int index;
+	char *str;
+
+	index = ripng_enable_if_lookup(ripng, ifname);
+	if (index < 0)
+		return NB_ERR_INCONSISTENCY;
+
+	str = vector_slot(ripng->enable_if, index);
+	free(str);
+	vector_unset(ripng->enable_if, index);
+
+	ripng_enable_apply_all(ripng);
+
+	return NB_OK;
+}
+
+/* Wake up interface. */
+static void ripng_interface_wakeup(struct event *t)
+{
+	struct interface *ifp;
+	struct ripng_interface *ri;
+
+	/* Get interface. */
+	ifp = EVENT_ARG(t);
+
+	ri = ifp->info;
+
+	/* Join to multicast group. */
+	if (ripng_multicast_join(ifp, ri->ripng->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. */
+	ripng_request(ifp);
+}
+
+static void ripng_connect_set(struct interface *ifp, int set)
+{
+	struct ripng_interface *ri = ifp->info;
+	struct ripng *ripng = ri->ripng;
+	struct listnode *node, *nnode;
+	struct connected *connected;
+	struct prefix_ipv6 address;
+
+	for (ALL_LIST_ELEMENTS(ifp->connected, node, nnode, connected)) {
+		struct prefix *p;
+		p = connected->address;
+
+		if (p->family != AF_INET6)
+			continue;
+
+		address.family = AF_INET6;
+		address.prefix = p->u.prefix6;
+		address.prefixlen = p->prefixlen;
+		apply_mask_ipv6(&address);
+
+		if (set) {
+			/* Check once more whether this prefix is within a
+			 * "network IF_OR_PREF" one */
+			if ((ripng_enable_if_lookup(
+				     ripng, connected->ifp->name) >= 0) ||
+			    (ripng_enable_network_lookup2(connected) >= 0))
+				ripng_redistribute_add(
+					ripng, ZEBRA_ROUTE_CONNECT,
+					RIPNG_ROUTE_INTERFACE, &address,
+					connected->ifp->ifindex, NULL, 0);
+		} else {
+			ripng_redistribute_delete(ripng, ZEBRA_ROUTE_CONNECT,
+						  RIPNG_ROUTE_INTERFACE,
+						  &address,
+						  connected->ifp->ifindex);
+			if (ripng_redistribute_check(ripng,
+						     ZEBRA_ROUTE_CONNECT))
+				ripng_redistribute_add(
+					ripng, ZEBRA_ROUTE_CONNECT,
+					RIPNG_ROUTE_REDISTRIBUTE, &address,
+					connected->ifp->ifindex, NULL, 0);
+		}
+	}
+}
+
+/* Check RIPng is enabed on this interface. */
+void ripng_enable_apply(struct interface *ifp)
+{
+	int ret;
+	struct ripng_interface *ri = NULL;
+
+	/* Check interface. */
+	if (!if_is_up(ifp))
+		return;
+
+	ri = ifp->info;
+
+	/* Is this interface a candidate for RIPng ? */
+	ret = ripng_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 = ripng_enable_if_lookup(ri->ripng, ifp->name);
+	if (ret >= 0)
+		ri->enable_interface = 1;
+	else
+		ri->enable_interface = 0;
+
+	/* any candidate interface MUST have a link-local IPv6 address */
+	if ((!ripng_if_ipv6_lladdress_check(ifp))
+	    && (ri->enable_network || ri->enable_interface)) {
+		ri->enable_network = 0;
+		ri->enable_interface = 0;
+		zlog_warn("Interface %s does not have any link-local address",
+			  ifp->name);
+	}
+
+	/* Update running status of the interface. */
+	if (ri->enable_network || ri->enable_interface) {
+		zlog_info("RIPng INTERFACE ON %s", ifp->name);
+
+		/* Add interface wake up thread. */
+		event_add_timer(master, ripng_interface_wakeup, ifp, 1,
+				&ri->t_wakeup);
+
+		ripng_connect_set(ifp, 1);
+	} else {
+		if (ri->running) {
+			/* Might as well clean up the route table as well
+			 * ripng_if_down sets to 0 ri->running, and displays
+			 *"turn off %s"
+			 **/
+			ripng_if_down(ifp);
+
+			ripng_connect_set(ifp, 0);
+		}
+	}
+}
+
+/* Set distribute list to all interfaces. */
+static void ripng_enable_apply_all(struct ripng *ripng)
+{
+	struct interface *ifp;
+
+	FOR_ALL_INTERFACES (ripng->vrf, ifp)
+		ripng_enable_apply(ifp);
+}
+
+/* Clear all network and neighbor configuration */
+void ripng_clean_network(struct ripng *ripng)
+{
+	unsigned int i;
+	char *str;
+	struct agg_node *rn;
+
+	/* ripng->enable_network */
+	for (rn = agg_route_top(ripng->enable_network); rn;
+	     rn = agg_route_next(rn))
+		if (rn->info) {
+			rn->info = NULL;
+			agg_unlock_node(rn);
+		}
+
+	/* ripng->enable_if */
+	for (i = 0; i < vector_active(ripng->enable_if); i++)
+		if ((str = vector_slot(ripng->enable_if, i)) != NULL) {
+			free(str);
+			vector_slot(ripng->enable_if, i) = NULL;
+		}
+}
+
+/* Utility function for looking up passive interface settings. */
+static int ripng_passive_interface_lookup(struct ripng *ripng,
+					  const char *ifname)
+{
+	unsigned int i;
+	char *str;
+
+	for (i = 0; i < vector_active(ripng->passive_interface); i++)
+		if ((str = vector_slot(ripng->passive_interface, i)) != NULL)
+			if (strcmp(str, ifname) == 0)
+				return i;
+	return -1;
+}
+
+void ripng_passive_interface_apply(struct interface *ifp)
+{
+	int ret;
+	struct ripng_interface *ri;
+	struct ripng *ripng;
+
+	ri = ifp->info;
+	ripng = ri->ripng;
+	if (!ripng)
+		return;
+
+	ret = ripng_passive_interface_lookup(ripng, ifp->name);
+	if (ret < 0)
+		ri->passive = 0;
+	else
+		ri->passive = 1;
+}
+
+static void ripng_passive_interface_apply_all(struct ripng *ripng)
+{
+	struct interface *ifp;
+
+	FOR_ALL_INTERFACES (ripng->vrf, ifp)
+		ripng_passive_interface_apply(ifp);
+}
+
+/* Passive interface. */
+int ripng_passive_interface_set(struct ripng *ripng, const char *ifname)
+{
+	if (ripng_passive_interface_lookup(ripng, ifname) >= 0)
+		return NB_ERR_INCONSISTENCY;
+
+	vector_set(ripng->passive_interface, strdup(ifname));
+
+	ripng_passive_interface_apply_all(ripng);
+
+	return NB_OK;
+}
+
+int ripng_passive_interface_unset(struct ripng *ripng, const char *ifname)
+{
+	int i;
+	char *str;
+
+	i = ripng_passive_interface_lookup(ripng, ifname);
+	if (i < 0)
+		return NB_ERR_INCONSISTENCY;
+
+	str = vector_slot(ripng->passive_interface, i);
+	free(str);
+	vector_unset(ripng->passive_interface, i);
+
+	ripng_passive_interface_apply_all(ripng);
+
+	return NB_OK;
+}
+
+/* Free all configured RIP passive-interface settings. */
+void ripng_passive_interface_clean(struct ripng *ripng)
+{
+	unsigned int i;
+	char *str;
+
+	for (i = 0; i < vector_active(ripng->passive_interface); i++)
+		if ((str = vector_slot(ripng->passive_interface, i)) != NULL) {
+			free(str);
+			vector_slot(ripng->passive_interface, i) = NULL;
+		}
+	ripng_passive_interface_apply_all(ripng);
+}
+
+/* Write RIPng enable network and interface to the vty. */
+int ripng_network_write(struct vty *vty, struct ripng *ripng)
+{
+	unsigned int i;
+	const char *ifname;
+	struct agg_node *node;
+
+	/* Write enable network. */
+	for (node = agg_route_top(ripng->enable_network); node;
+	     node = agg_route_next(node))
+		if (node->info)
+			vty_out(vty, "    %pRN\n", node);
+
+	/* Write enable interface. */
+	for (i = 0; i < vector_active(ripng->enable_if); i++)
+		if ((ifname = vector_slot(ripng->enable_if, i)) != NULL)
+			vty_out(vty, "    %s\n", ifname);
+
+	return 0;
+}
+
+static struct ripng_interface *ri_new(void)
+{
+	struct ripng_interface *ri;
+
+	ri = XCALLOC(MTYPE_RIPNG_IF, sizeof(struct ripng_interface));
+
+	/* 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", RIPNG_IFACE);
+
+	return ri;
+}
+
+void ripng_interface_sync(struct interface *ifp)
+{
+	struct ripng_interface *ri;
+
+	ri = ifp->info;
+	if (ri)
+		ri->ripng = ifp->vrf->info;
+}
+
+static int ripng_if_new_hook(struct interface *ifp)
+{
+	ifp->info = ri_new();
+	ripng_interface_sync(ifp);
+
+	return 0;
+}
+
+/* Called when interface structure deleted. */
+static int ripng_if_delete_hook(struct interface *ifp)
+{
+	XFREE(MTYPE_RIPNG_IF, ifp->info);
+	return 0;
+}
+
+/* Initialization of interface. */
+void ripng_if_init(void)
+{
+	/* Interface initialize. */
+	hook_register_prio(if_add, 0, ripng_if_new_hook);
+	hook_register_prio(if_del, 0, ripng_if_delete_hook);
+
+	/* Install interface node. */
+	if_cmd_init_default();
+	if_zapi_callbacks(ripng_ifp_create, ripng_ifp_up,
+			  ripng_ifp_down, ripng_ifp_destroy);
+}