Adding upstream version 8.4.4.upstream/8.4.4upstream

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

1 files changed, 2373 insertions, 0 deletions

diff --git a/zebra/if_netlink.c b/zebra/if_netlink.c
new file mode 100644
index 0000000..a52bd34
--- /dev/null
+++ b/zebra/if_netlink.c
@@ -0,0 +1,2373 @@
+/*
+ * Interface looking up by netlink.
+ * Copyright (C) 1998 Kunihiro Ishiguro
+ *
+ * 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>
+
+#ifdef GNU_LINUX
+
+/* The following definition is to workaround an issue in the Linux kernel
+ * header files with redefinition of 'struct in6_addr' in both
+ * netinet/in.h and linux/in6.h.
+ * Reference - https://sourceware.org/ml/libc-alpha/2013-01/msg00599.html
+ */
+#define _LINUX_IN6_H
+#define _LINUX_IF_H
+#define _LINUX_IP_H
+
+#include <netinet/if_ether.h>
+#include <linux/if_bridge.h>
+#include <linux/if_link.h>
+#include <linux/if_tunnel.h>
+#include <net/if_arp.h>
+#include <linux/sockios.h>
+#include <linux/ethtool.h>
+
+#include "linklist.h"
+#include "if.h"
+#include "log.h"
+#include "prefix.h"
+#include "connected.h"
+#include "table.h"
+#include "memory.h"
+#include "rib.h"
+#include "thread.h"
+#include "privs.h"
+#include "nexthop.h"
+#include "vrf.h"
+#include "vrf_int.h"
+#include "mpls.h"
+#include "lib_errors.h"
+
+#include "vty.h"
+#include "zebra/zserv.h"
+#include "zebra/zebra_ns.h"
+#include "zebra/zebra_vrf.h"
+#include "zebra/rt.h"
+#include "zebra/redistribute.h"
+#include "zebra/interface.h"
+#include "zebra/debug.h"
+#include "zebra/rtadv.h"
+#include "zebra/zebra_ptm.h"
+#include "zebra/zebra_mpls.h"
+#include "zebra/kernel_netlink.h"
+#include "zebra/rt_netlink.h"
+#include "zebra/if_netlink.h"
+#include "zebra/zebra_errors.h"
+#include "zebra/zebra_vxlan.h"
+#include "zebra/zebra_evpn_mh.h"
+#include "zebra/zebra_l2.h"
+#include "zebra/netconf_netlink.h"
+#include "zebra/zebra_trace.h"
+
+extern struct zebra_privs_t zserv_privs;
+uint8_t frr_protodown_r_bit = FRR_PROTODOWN_REASON_DEFAULT_BIT;
+
+/* Note: on netlink systems, there should be a 1-to-1 mapping between interface
+   names and ifindex values. */
+static void set_ifindex(struct interface *ifp, ifindex_t ifi_index,
+			struct zebra_ns *zns)
+{
+	struct interface *oifp;
+
+	if (((oifp = if_lookup_by_index_per_ns(zns, ifi_index)) != NULL)
+	    && (oifp != ifp)) {
+		if (ifi_index == IFINDEX_INTERNAL)
+			flog_err(
+				EC_LIB_INTERFACE,
+				"Netlink is setting interface %s ifindex to reserved internal value %u",
+				ifp->name, ifi_index);
+		else {
+			if (IS_ZEBRA_DEBUG_KERNEL)
+				zlog_debug(
+					"interface index %d was renamed from %s to %s",
+					ifi_index, oifp->name, ifp->name);
+			if (if_is_up(oifp))
+				flog_err(
+					EC_LIB_INTERFACE,
+					"interface rename detected on up interface: index %d was renamed from %s to %s, results are uncertain!",
+					ifi_index, oifp->name, ifp->name);
+			if_delete_update(&oifp);
+		}
+	}
+	if_set_index(ifp, ifi_index);
+}
+
+/* Utility function to parse hardware link-layer address and update ifp */
+static void netlink_interface_update_hw_addr(struct rtattr **tb,
+					     struct interface *ifp)
+{
+	int i;
+
+	if (tb[IFLA_ADDRESS]) {
+		int hw_addr_len;
+
+		hw_addr_len = RTA_PAYLOAD(tb[IFLA_ADDRESS]);
+
+		if (hw_addr_len > INTERFACE_HWADDR_MAX)
+			zlog_debug("Hardware address is too large: %d",
+				   hw_addr_len);
+		else {
+			ifp->hw_addr_len = hw_addr_len;
+			memcpy(ifp->hw_addr, RTA_DATA(tb[IFLA_ADDRESS]),
+			       hw_addr_len);
+
+			for (i = 0; i < hw_addr_len; i++)
+				if (ifp->hw_addr[i] != 0)
+					break;
+
+			if (i == hw_addr_len)
+				ifp->hw_addr_len = 0;
+			else
+				ifp->hw_addr_len = hw_addr_len;
+		}
+	}
+}
+
+static enum zebra_link_type netlink_to_zebra_link_type(unsigned int hwt)
+{
+	switch (hwt) {
+	case ARPHRD_ETHER:
+		return ZEBRA_LLT_ETHER;
+	case ARPHRD_EETHER:
+		return ZEBRA_LLT_EETHER;
+	case ARPHRD_AX25:
+		return ZEBRA_LLT_AX25;
+	case ARPHRD_PRONET:
+		return ZEBRA_LLT_PRONET;
+	case ARPHRD_IEEE802:
+		return ZEBRA_LLT_IEEE802;
+	case ARPHRD_ARCNET:
+		return ZEBRA_LLT_ARCNET;
+	case ARPHRD_APPLETLK:
+		return ZEBRA_LLT_APPLETLK;
+	case ARPHRD_DLCI:
+		return ZEBRA_LLT_DLCI;
+	case ARPHRD_ATM:
+		return ZEBRA_LLT_ATM;
+	case ARPHRD_METRICOM:
+		return ZEBRA_LLT_METRICOM;
+	case ARPHRD_IEEE1394:
+		return ZEBRA_LLT_IEEE1394;
+	case ARPHRD_EUI64:
+		return ZEBRA_LLT_EUI64;
+	case ARPHRD_INFINIBAND:
+		return ZEBRA_LLT_INFINIBAND;
+	case ARPHRD_SLIP:
+		return ZEBRA_LLT_SLIP;
+	case ARPHRD_CSLIP:
+		return ZEBRA_LLT_CSLIP;
+	case ARPHRD_SLIP6:
+		return ZEBRA_LLT_SLIP6;
+	case ARPHRD_CSLIP6:
+		return ZEBRA_LLT_CSLIP6;
+	case ARPHRD_RSRVD:
+		return ZEBRA_LLT_RSRVD;
+	case ARPHRD_ADAPT:
+		return ZEBRA_LLT_ADAPT;
+	case ARPHRD_ROSE:
+		return ZEBRA_LLT_ROSE;
+	case ARPHRD_X25:
+		return ZEBRA_LLT_X25;
+	case ARPHRD_PPP:
+		return ZEBRA_LLT_PPP;
+	case ARPHRD_CISCO:
+		return ZEBRA_LLT_CHDLC;
+	case ARPHRD_LAPB:
+		return ZEBRA_LLT_LAPB;
+	case ARPHRD_RAWHDLC:
+		return ZEBRA_LLT_RAWHDLC;
+	case ARPHRD_TUNNEL:
+		return ZEBRA_LLT_IPIP;
+	case ARPHRD_TUNNEL6:
+		return ZEBRA_LLT_IPIP6;
+	case ARPHRD_FRAD:
+		return ZEBRA_LLT_FRAD;
+	case ARPHRD_SKIP:
+		return ZEBRA_LLT_SKIP;
+	case ARPHRD_LOOPBACK:
+		return ZEBRA_LLT_LOOPBACK;
+	case ARPHRD_LOCALTLK:
+		return ZEBRA_LLT_LOCALTLK;
+	case ARPHRD_FDDI:
+		return ZEBRA_LLT_FDDI;
+	case ARPHRD_SIT:
+		return ZEBRA_LLT_SIT;
+	case ARPHRD_IPDDP:
+		return ZEBRA_LLT_IPDDP;
+	case ARPHRD_IPGRE:
+		return ZEBRA_LLT_IPGRE;
+	case ARPHRD_PIMREG:
+		return ZEBRA_LLT_PIMREG;
+	case ARPHRD_HIPPI:
+		return ZEBRA_LLT_HIPPI;
+	case ARPHRD_ECONET:
+		return ZEBRA_LLT_ECONET;
+	case ARPHRD_IRDA:
+		return ZEBRA_LLT_IRDA;
+	case ARPHRD_FCPP:
+		return ZEBRA_LLT_FCPP;
+	case ARPHRD_FCAL:
+		return ZEBRA_LLT_FCAL;
+	case ARPHRD_FCPL:
+		return ZEBRA_LLT_FCPL;
+	case ARPHRD_FCFABRIC:
+		return ZEBRA_LLT_FCFABRIC;
+	case ARPHRD_IEEE802_TR:
+		return ZEBRA_LLT_IEEE802_TR;
+	case ARPHRD_IEEE80211:
+		return ZEBRA_LLT_IEEE80211;
+#ifdef ARPHRD_IEEE802154
+	case ARPHRD_IEEE802154:
+		return ZEBRA_LLT_IEEE802154;
+#endif
+#ifdef ARPHRD_IP6GRE
+	case ARPHRD_IP6GRE:
+		return ZEBRA_LLT_IP6GRE;
+#endif
+#ifdef ARPHRD_IEEE802154_PHY
+	case ARPHRD_IEEE802154_PHY:
+		return ZEBRA_LLT_IEEE802154_PHY;
+#endif
+
+	default:
+		return ZEBRA_LLT_UNKNOWN;
+	}
+}
+
+static inline void zebra_if_set_ziftype(struct interface *ifp,
+					enum zebra_iftype zif_type,
+					enum zebra_slave_iftype zif_slave_type)
+{
+	struct zebra_if *zif;
+
+	zif = (struct zebra_if *)ifp->info;
+	zif->zif_slave_type = zif_slave_type;
+
+	if (zif->zif_type != zif_type) {
+		zif->zif_type = zif_type;
+		/* If the if_type has been set to bond initialize ES info
+		 * against it. XXX - note that we don't handle the case where
+		 * a zif changes from bond to non-bond; it is really
+		 * an unexpected/error condition.
+		 */
+		zebra_evpn_if_init(zif);
+	}
+}
+
+static void netlink_determine_zebra_iftype(const char *kind,
+					   enum zebra_iftype *zif_type)
+{
+	*zif_type = ZEBRA_IF_OTHER;
+
+	if (!kind)
+		return;
+
+	if (strcmp(kind, "vrf") == 0)
+		*zif_type = ZEBRA_IF_VRF;
+	else if (strcmp(kind, "bridge") == 0)
+		*zif_type = ZEBRA_IF_BRIDGE;
+	else if (strcmp(kind, "vlan") == 0)
+		*zif_type = ZEBRA_IF_VLAN;
+	else if (strcmp(kind, "vxlan") == 0)
+		*zif_type = ZEBRA_IF_VXLAN;
+	else if (strcmp(kind, "macvlan") == 0)
+		*zif_type = ZEBRA_IF_MACVLAN;
+	else if (strcmp(kind, "veth") == 0)
+		*zif_type = ZEBRA_IF_VETH;
+	else if (strcmp(kind, "bond") == 0)
+		*zif_type = ZEBRA_IF_BOND;
+	else if (strcmp(kind, "bond_slave") == 0)
+		*zif_type = ZEBRA_IF_BOND_SLAVE;
+	else if (strcmp(kind, "gre") == 0)
+		*zif_type = ZEBRA_IF_GRE;
+}
+
+static void netlink_vrf_change(struct nlmsghdr *h, struct rtattr *tb,
+			       uint32_t ns_id, const char *name)
+{
+	struct ifinfomsg *ifi;
+	struct rtattr *linkinfo[IFLA_INFO_MAX + 1];
+	struct rtattr *attr[IFLA_VRF_MAX + 1];
+	struct vrf *vrf = NULL;
+	struct zebra_vrf *zvrf;
+	uint32_t nl_table_id;
+
+	ifi = NLMSG_DATA(h);
+
+	netlink_parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb);
+
+	if (!linkinfo[IFLA_INFO_DATA]) {
+		if (IS_ZEBRA_DEBUG_KERNEL)
+			zlog_debug(
+				"%s: IFLA_INFO_DATA missing from VRF message: %s",
+				__func__, name);
+		return;
+	}
+
+	netlink_parse_rtattr_nested(attr, IFLA_VRF_MAX,
+				    linkinfo[IFLA_INFO_DATA]);
+	if (!attr[IFLA_VRF_TABLE]) {
+		if (IS_ZEBRA_DEBUG_KERNEL)
+			zlog_debug(
+				"%s: IFLA_VRF_TABLE missing from VRF message: %s",
+				__func__, name);
+		return;
+	}
+
+	nl_table_id = *(uint32_t *)RTA_DATA(attr[IFLA_VRF_TABLE]);
+
+	if (h->nlmsg_type == RTM_NEWLINK) {
+		if (IS_ZEBRA_DEBUG_KERNEL)
+			zlog_debug("RTM_NEWLINK for VRF %s(%u) table %u", name,
+				   ifi->ifi_index, nl_table_id);
+
+		if (!vrf_lookup_by_id((vrf_id_t)ifi->ifi_index)) {
+			vrf_id_t exist_id;
+
+			exist_id = vrf_lookup_by_table(nl_table_id, ns_id);
+			if (exist_id != VRF_DEFAULT) {
+				vrf = vrf_lookup_by_id(exist_id);
+
+				flog_err(
+					EC_ZEBRA_VRF_MISCONFIGURED,
+					"VRF %s id %u table id overlaps existing vrf %s, misconfiguration exiting",
+					name, ifi->ifi_index, vrf->name);
+				exit(-1);
+			}
+		}
+
+		vrf = vrf_update((vrf_id_t)ifi->ifi_index, name);
+		if (!vrf) {
+			flog_err(EC_LIB_INTERFACE, "VRF %s id %u not created",
+				 name, ifi->ifi_index);
+			return;
+		}
+
+		/*
+		 * This is the only place that we get the actual kernel table_id
+		 * being used.  We need it to set the table_id of the routes
+		 * we are passing to the kernel.... And to throw some totally
+		 * awesome parties. that too.
+		 *
+		 * At this point we *must* have a zvrf because the vrf_create
+		 * callback creates one.  We *must* set the table id
+		 * before the vrf_enable because of( at the very least )
+		 * static routes being delayed for installation until
+		 * during the vrf_enable callbacks.
+		 */
+		zvrf = (struct zebra_vrf *)vrf->info;
+		zvrf->table_id = nl_table_id;
+
+		/* Enable the created VRF. */
+		if (!vrf_enable(vrf)) {
+			flog_err(EC_LIB_INTERFACE,
+				 "Failed to enable VRF %s id %u", name,
+				 ifi->ifi_index);
+			return;
+		}
+
+	} else // h->nlmsg_type == RTM_DELLINK
+	{
+		if (IS_ZEBRA_DEBUG_KERNEL)
+			zlog_debug("RTM_DELLINK for VRF %s(%u)", name,
+				   ifi->ifi_index);
+
+		vrf = vrf_lookup_by_id((vrf_id_t)ifi->ifi_index);
+
+		if (!vrf) {
+			flog_warn(EC_ZEBRA_VRF_NOT_FOUND, "%s: vrf not found",
+				  __func__);
+			return;
+		}
+
+		vrf_delete(vrf);
+	}
+}
+
+static uint32_t get_iflink_speed(struct interface *interface, int *error)
+{
+	struct ifreq ifdata;
+	struct ethtool_cmd ecmd;
+	int sd;
+	int rc;
+	const char *ifname = interface->name;
+
+	if (error)
+		*error = 0;
+	/* initialize struct */
+	memset(&ifdata, 0, sizeof(ifdata));
+
+	/* set interface name */
+	strlcpy(ifdata.ifr_name, ifname, sizeof(ifdata.ifr_name));
+
+	/* initialize ethtool interface */
+	memset(&ecmd, 0, sizeof(ecmd));
+	ecmd.cmd = ETHTOOL_GSET; /* ETHTOOL_GLINK */
+	ifdata.ifr_data = (caddr_t)&ecmd;
+
+	/* use ioctl to get speed of an interface */
+	frr_with_privs(&zserv_privs) {
+		sd = vrf_socket(PF_INET, SOCK_DGRAM, IPPROTO_IP,
+				interface->vrf->vrf_id, NULL);
+		if (sd < 0) {
+			if (IS_ZEBRA_DEBUG_KERNEL)
+				zlog_debug("Failure to read interface %s speed: %d %s",
+					   ifname, errno, safe_strerror(errno));
+			/* no vrf socket creation may probably mean vrf issue */
+			if (error)
+				*error = -1;
+			return 0;
+		}
+		/* Get the current link state for the interface */
+		rc = vrf_ioctl(interface->vrf->vrf_id, sd, SIOCETHTOOL,
+			       (char *)&ifdata);
+	}
+	if (rc < 0) {
+		if (errno != EOPNOTSUPP && IS_ZEBRA_DEBUG_KERNEL)
+			zlog_debug(
+				"IOCTL failure to read interface %s speed: %d %s",
+				ifname, errno, safe_strerror(errno));
+		/* no device means interface unreachable */
+		if (errno == ENODEV && error)
+			*error = -1;
+		ecmd.speed_hi = 0;
+		ecmd.speed = 0;
+	}
+
+	close(sd);
+
+	return ((uint32_t)ecmd.speed_hi << 16) | ecmd.speed;
+}
+
+uint32_t kernel_get_speed(struct interface *ifp, int *error)
+{
+	return get_iflink_speed(ifp, error);
+}
+
+static ssize_t
+netlink_gre_set_msg_encoder(struct zebra_dplane_ctx *ctx, void *buf,
+			    size_t buflen)
+{
+	struct {
+		struct nlmsghdr n;
+		struct ifinfomsg ifi;
+		char buf[];
+	} *req = buf;
+	uint32_t link_idx;
+	unsigned int mtu;
+	struct rtattr *rta_info, *rta_data;
+	const struct zebra_l2info_gre *gre_info;
+
+	if (buflen < sizeof(*req))
+		return 0;
+	memset(req, 0, sizeof(*req));
+
+	req->n.nlmsg_type =  RTM_NEWLINK;
+	req->n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
+	req->n.nlmsg_flags = NLM_F_REQUEST;
+
+	req->ifi.ifi_index = dplane_ctx_get_ifindex(ctx);
+
+	gre_info = dplane_ctx_gre_get_info(ctx);
+	if (!gre_info)
+		return 0;
+
+	req->ifi.ifi_change = 0xFFFFFFFF;
+	link_idx = dplane_ctx_gre_get_link_ifindex(ctx);
+	mtu = dplane_ctx_gre_get_mtu(ctx);
+
+	if (mtu && !nl_attr_put32(&req->n, buflen, IFLA_MTU, mtu))
+		return 0;
+
+	rta_info = nl_attr_nest(&req->n, buflen, IFLA_LINKINFO);
+	if (!rta_info)
+		return 0;
+
+	if (!nl_attr_put(&req->n, buflen, IFLA_INFO_KIND, "gre", 3))
+		return 0;
+
+	rta_data = nl_attr_nest(&req->n, buflen, IFLA_INFO_DATA);
+	if (!rta_data)
+		return 0;
+
+	if (!nl_attr_put32(&req->n, buflen, IFLA_GRE_LINK, link_idx))
+		return 0;
+
+	if (gre_info->vtep_ip.s_addr &&
+	    !nl_attr_put32(&req->n, buflen, IFLA_GRE_LOCAL,
+			   gre_info->vtep_ip.s_addr))
+		return 0;
+
+	if (gre_info->vtep_ip_remote.s_addr &&
+	    !nl_attr_put32(&req->n, buflen, IFLA_GRE_REMOTE,
+			   gre_info->vtep_ip_remote.s_addr))
+		return 0;
+
+	if (gre_info->ikey &&
+	    !nl_attr_put32(&req->n, buflen, IFLA_GRE_IKEY,
+			   gre_info->ikey))
+		return 0;
+	if (gre_info->okey &&
+	    !nl_attr_put32(&req->n, buflen, IFLA_GRE_IKEY,
+			   gre_info->okey))
+		return 0;
+
+	nl_attr_nest_end(&req->n, rta_data);
+	nl_attr_nest_end(&req->n, rta_info);
+
+	return NLMSG_ALIGN(req->n.nlmsg_len);
+}
+
+static int netlink_extract_bridge_info(struct rtattr *link_data,
+				       struct zebra_l2info_bridge *bridge_info)
+{
+	struct rtattr *attr[IFLA_BR_MAX + 1];
+
+	memset(bridge_info, 0, sizeof(*bridge_info));
+	netlink_parse_rtattr_nested(attr, IFLA_BR_MAX, link_data);
+	if (attr[IFLA_BR_VLAN_FILTERING])
+		bridge_info->vlan_aware =
+			*(uint8_t *)RTA_DATA(attr[IFLA_BR_VLAN_FILTERING]);
+	return 0;
+}
+
+static int netlink_extract_vlan_info(struct rtattr *link_data,
+				     struct zebra_l2info_vlan *vlan_info)
+{
+	struct rtattr *attr[IFLA_VLAN_MAX + 1];
+	vlanid_t vid_in_msg;
+
+	memset(vlan_info, 0, sizeof(*vlan_info));
+	netlink_parse_rtattr_nested(attr, IFLA_VLAN_MAX, link_data);
+	if (!attr[IFLA_VLAN_ID]) {
+		if (IS_ZEBRA_DEBUG_KERNEL)
+			zlog_debug("IFLA_VLAN_ID missing from VLAN IF message");
+		return -1;
+	}
+
+	vid_in_msg = *(vlanid_t *)RTA_DATA(attr[IFLA_VLAN_ID]);
+	vlan_info->vid = vid_in_msg;
+	return 0;
+}
+
+static int netlink_extract_gre_info(struct rtattr *link_data,
+				    struct zebra_l2info_gre *gre_info)
+{
+	struct rtattr *attr[IFLA_GRE_MAX + 1];
+
+	memset(gre_info, 0, sizeof(*gre_info));
+	memset(attr, 0, sizeof(attr));
+	netlink_parse_rtattr_nested(attr, IFLA_GRE_MAX, link_data);
+
+	if (!attr[IFLA_GRE_LOCAL]) {
+		if (IS_ZEBRA_DEBUG_KERNEL)
+			zlog_debug(
+				"IFLA_GRE_LOCAL missing from GRE IF message");
+	} else
+		gre_info->vtep_ip =
+			*(struct in_addr *)RTA_DATA(attr[IFLA_GRE_LOCAL]);
+	if (!attr[IFLA_GRE_REMOTE]) {
+		if (IS_ZEBRA_DEBUG_KERNEL)
+			zlog_debug(
+				"IFLA_GRE_REMOTE missing from GRE IF message");
+	} else
+		gre_info->vtep_ip_remote =
+			*(struct in_addr *)RTA_DATA(attr[IFLA_GRE_REMOTE]);
+
+	if (!attr[IFLA_GRE_LINK]) {
+		if (IS_ZEBRA_DEBUG_KERNEL)
+			zlog_debug("IFLA_GRE_LINK missing from GRE IF message");
+	} else {
+		gre_info->ifindex_link =
+			*(ifindex_t *)RTA_DATA(attr[IFLA_GRE_LINK]);
+		if (IS_ZEBRA_DEBUG_KERNEL)
+			zlog_debug("IFLA_GRE_LINK obtained is %u",
+				   gre_info->ifindex_link);
+	}
+	if (attr[IFLA_GRE_IKEY])
+		gre_info->ikey = *(uint32_t *)RTA_DATA(attr[IFLA_GRE_IKEY]);
+	if (attr[IFLA_GRE_OKEY])
+		gre_info->okey = *(uint32_t *)RTA_DATA(attr[IFLA_GRE_OKEY]);
+	return 0;
+}
+
+static int netlink_extract_vxlan_info(struct rtattr *link_data,
+				      struct zebra_l2info_vxlan *vxl_info)
+{
+	struct rtattr *attr[IFLA_VXLAN_MAX + 1];
+	vni_t vni_in_msg;
+	struct in_addr vtep_ip_in_msg;
+	ifindex_t ifindex_link;
+
+	memset(vxl_info, 0, sizeof(*vxl_info));
+	netlink_parse_rtattr_nested(attr, IFLA_VXLAN_MAX, link_data);
+	if (!attr[IFLA_VXLAN_ID]) {
+		if (IS_ZEBRA_DEBUG_KERNEL)
+			zlog_debug(
+				"IFLA_VXLAN_ID missing from VXLAN IF message");
+		return -1;
+	}
+
+	vni_in_msg = *(vni_t *)RTA_DATA(attr[IFLA_VXLAN_ID]);
+	vxl_info->vni = vni_in_msg;
+	if (!attr[IFLA_VXLAN_LOCAL]) {
+		if (IS_ZEBRA_DEBUG_KERNEL)
+			zlog_debug(
+				"IFLA_VXLAN_LOCAL missing from VXLAN IF message");
+	} else {
+		vtep_ip_in_msg =
+			*(struct in_addr *)RTA_DATA(attr[IFLA_VXLAN_LOCAL]);
+		vxl_info->vtep_ip = vtep_ip_in_msg;
+	}
+
+	if (attr[IFLA_VXLAN_GROUP]) {
+		vxl_info->mcast_grp =
+			*(struct in_addr *)RTA_DATA(attr[IFLA_VXLAN_GROUP]);
+	}
+
+	if (!attr[IFLA_VXLAN_LINK]) {
+		if (IS_ZEBRA_DEBUG_KERNEL)
+			zlog_debug("IFLA_VXLAN_LINK missing from VXLAN IF message");
+	} else {
+		ifindex_link =
+			*(ifindex_t *)RTA_DATA(attr[IFLA_VXLAN_LINK]);
+		vxl_info->ifindex_link = ifindex_link;
+	}
+	return 0;
+}
+
+/*
+ * Extract and save L2 params (of interest) for an interface. When a
+ * bridge interface is added or updated, take further actions to map
+ * its members. Likewise, for VxLAN interface.
+ */
+static void netlink_interface_update_l2info(struct interface *ifp,
+					    struct rtattr *link_data, int add,
+					    ns_id_t link_nsid)
+{
+	if (!link_data)
+		return;
+
+	if (IS_ZEBRA_IF_BRIDGE(ifp)) {
+		struct zebra_l2info_bridge bridge_info;
+
+		netlink_extract_bridge_info(link_data, &bridge_info);
+		zebra_l2_bridge_add_update(ifp, &bridge_info, add);
+	} else if (IS_ZEBRA_IF_VLAN(ifp)) {
+		struct zebra_l2info_vlan vlan_info;
+
+		netlink_extract_vlan_info(link_data, &vlan_info);
+		zebra_l2_vlanif_update(ifp, &vlan_info);
+		zebra_evpn_acc_bd_svi_set(ifp->info, NULL,
+					  !!if_is_operative(ifp));
+	} else if (IS_ZEBRA_IF_VXLAN(ifp)) {
+		struct zebra_l2info_vxlan vxlan_info;
+
+		netlink_extract_vxlan_info(link_data, &vxlan_info);
+		vxlan_info.link_nsid = link_nsid;
+		zebra_l2_vxlanif_add_update(ifp, &vxlan_info, add);
+		if (link_nsid != NS_UNKNOWN &&
+		    vxlan_info.ifindex_link)
+			zebra_if_update_link(ifp, vxlan_info.ifindex_link,
+					     link_nsid);
+	} else if (IS_ZEBRA_IF_GRE(ifp)) {
+		struct zebra_l2info_gre gre_info;
+
+		netlink_extract_gre_info(link_data, &gre_info);
+		gre_info.link_nsid = link_nsid;
+		zebra_l2_greif_add_update(ifp, &gre_info, add);
+		if (link_nsid != NS_UNKNOWN &&
+		    gre_info.ifindex_link)
+			zebra_if_update_link(ifp, gre_info.ifindex_link,
+					     link_nsid);
+	}
+}
+
+static int netlink_bridge_vxlan_update(struct interface *ifp,
+		struct rtattr *af_spec)
+{
+	struct rtattr *aftb[IFLA_BRIDGE_MAX + 1];
+	struct bridge_vlan_info *vinfo;
+	vlanid_t access_vlan;
+
+	if (!af_spec)
+		return 0;
+
+	/* There is a 1-to-1 mapping of VLAN to VxLAN - hence
+	 * only 1 access VLAN is accepted.
+	 */
+	netlink_parse_rtattr_nested(aftb, IFLA_BRIDGE_MAX, af_spec);
+	if (!aftb[IFLA_BRIDGE_VLAN_INFO])
+		return 0;
+
+	vinfo = RTA_DATA(aftb[IFLA_BRIDGE_VLAN_INFO]);
+	if (!(vinfo->flags & BRIDGE_VLAN_INFO_PVID))
+		return 0;
+
+	access_vlan = (vlanid_t)vinfo->vid;
+	if (IS_ZEBRA_DEBUG_KERNEL)
+		zlog_debug("Access VLAN %u for VxLAN IF %s(%u)", access_vlan,
+				ifp->name, ifp->ifindex);
+	zebra_l2_vxlanif_update_access_vlan(ifp, access_vlan);
+	return 0;
+}
+
+static void netlink_bridge_vlan_update(struct interface *ifp,
+		struct rtattr *af_spec)
+{
+	struct rtattr *i;
+	int rem;
+	uint16_t vid_range_start = 0;
+	struct zebra_if *zif;
+	bitfield_t old_vlan_bitmap;
+	struct bridge_vlan_info *vinfo;
+
+	zif = (struct zebra_if *)ifp->info;
+
+	/* cache the old bitmap addrs */
+	old_vlan_bitmap = zif->vlan_bitmap;
+	/* create a new bitmap space for re-eval */
+	bf_init(zif->vlan_bitmap, IF_VLAN_BITMAP_MAX);
+
+	if (af_spec) {
+		for (i = RTA_DATA(af_spec), rem = RTA_PAYLOAD(af_spec);
+		     RTA_OK(i, rem); i = RTA_NEXT(i, rem)) {
+
+			if (i->rta_type != IFLA_BRIDGE_VLAN_INFO)
+				continue;
+
+			vinfo = RTA_DATA(i);
+
+			if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
+				vid_range_start = vinfo->vid;
+				continue;
+			}
+
+			if (!(vinfo->flags & BRIDGE_VLAN_INFO_RANGE_END))
+				vid_range_start = vinfo->vid;
+
+			zebra_vlan_bitmap_compute(ifp, vid_range_start,
+						  vinfo->vid);
+		}
+	}
+
+	zebra_vlan_mbr_re_eval(ifp, old_vlan_bitmap);
+
+	bf_free(old_vlan_bitmap);
+}
+
+static int netlink_bridge_interface(struct nlmsghdr *h, int len, ns_id_t ns_id,
+				    int startup)
+{
+	char *name = NULL;
+	struct ifinfomsg *ifi;
+	struct rtattr *tb[IFLA_MAX + 1];
+	struct interface *ifp;
+	struct zebra_if *zif;
+	struct rtattr *af_spec;
+
+	/* Fetch name and ifindex */
+	ifi = NLMSG_DATA(h);
+	netlink_parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
+
+	if (tb[IFLA_IFNAME] == NULL)
+		return -1;
+	name = (char *)RTA_DATA(tb[IFLA_IFNAME]);
+
+	/* The interface should already be known, if not discard. */
+	ifp = if_lookup_by_index_per_ns(zebra_ns_lookup(ns_id), ifi->ifi_index);
+	if (!ifp) {
+		zlog_debug("Cannot find bridge IF %s(%u)", name,
+			   ifi->ifi_index);
+		return 0;
+	}
+
+	/* We are only interested in the access VLAN i.e., AF_SPEC */
+	af_spec = tb[IFLA_AF_SPEC];
+
+	if (IS_ZEBRA_IF_VXLAN(ifp))
+		return netlink_bridge_vxlan_update(ifp, af_spec);
+
+	/* build vlan bitmap associated with this interface if that
+	 * device type is interested in the vlans
+	 */
+	zif = (struct zebra_if *)ifp->info;
+	if (bf_is_inited(zif->vlan_bitmap))
+		netlink_bridge_vlan_update(ifp, af_spec);
+
+	return 0;
+}
+
+static bool is_if_protodown_reason_only_frr(uint32_t rc_bitfield)
+{
+	/* This shouldn't be possible */
+	assert(frr_protodown_r_bit < 32);
+	return (rc_bitfield == (((uint32_t)1) << frr_protodown_r_bit));
+}
+
+/*
+ * Process interface protodown dplane update.
+ *
+ * If the interface is an es bond member then it must follow EVPN's
+ * protodown setting.
+ */
+static void netlink_proc_dplane_if_protodown(struct zebra_if *zif,
+					     struct rtattr **tb)
+{
+	bool protodown;
+	bool old_protodown;
+	uint32_t rc_bitfield = 0;
+	struct rtattr *pd_reason_info[IFLA_MAX + 1];
+
+	protodown = !!*(uint8_t *)RTA_DATA(tb[IFLA_PROTO_DOWN]);
+
+	if (tb[IFLA_PROTO_DOWN_REASON]) {
+		netlink_parse_rtattr_nested(pd_reason_info, IFLA_INFO_MAX,
+					    tb[IFLA_PROTO_DOWN_REASON]);
+
+		if (pd_reason_info[IFLA_PROTO_DOWN_REASON_VALUE])
+			rc_bitfield = *(uint32_t *)RTA_DATA(
+				pd_reason_info[IFLA_PROTO_DOWN_REASON_VALUE]);
+	}
+
+	/*
+	 * Set our reason code to note it wasn't us.
+	 * If the reason we got from the kernel is ONLY frr though, don't
+	 * set it.
+	 */
+	COND_FLAG(zif->protodown_rc, ZEBRA_PROTODOWN_EXTERNAL,
+		  protodown && rc_bitfield &&
+			  !is_if_protodown_reason_only_frr(rc_bitfield));
+
+
+	old_protodown = !!ZEBRA_IF_IS_PROTODOWN(zif);
+	if (protodown == old_protodown)
+		return;
+
+	if (IS_ZEBRA_DEBUG_EVPN_MH_ES || IS_ZEBRA_DEBUG_KERNEL)
+		zlog_debug("interface %s dplane change, protdown %s",
+			   zif->ifp->name, protodown ? "on" : "off");
+
+	/* Set protodown, respectively */
+	COND_FLAG(zif->flags, ZIF_FLAG_PROTODOWN, protodown);
+
+	if (zebra_evpn_is_es_bond_member(zif->ifp)) {
+		/* Check it's not already being sent to the dplane first */
+		if (protodown &&
+		    CHECK_FLAG(zif->flags, ZIF_FLAG_SET_PROTODOWN)) {
+			if (IS_ZEBRA_DEBUG_EVPN_MH_ES || IS_ZEBRA_DEBUG_KERNEL)
+				zlog_debug(
+					"bond mbr %s protodown on recv'd but already sent protodown on to the dplane",
+					zif->ifp->name);
+			return;
+		}
+
+		if (!protodown &&
+		    CHECK_FLAG(zif->flags, ZIF_FLAG_UNSET_PROTODOWN)) {
+			if (IS_ZEBRA_DEBUG_EVPN_MH_ES || IS_ZEBRA_DEBUG_KERNEL)
+				zlog_debug(
+					"bond mbr %s protodown off recv'd but already sent protodown off to the dplane",
+					zif->ifp->name);
+			return;
+		}
+
+		if (IS_ZEBRA_DEBUG_EVPN_MH_ES || IS_ZEBRA_DEBUG_KERNEL)
+			zlog_debug(
+				"bond mbr %s reinstate protodown %s in the dplane",
+				zif->ifp->name, old_protodown ? "on" : "off");
+
+		if (old_protodown)
+			SET_FLAG(zif->flags, ZIF_FLAG_SET_PROTODOWN);
+		else
+			SET_FLAG(zif->flags, ZIF_FLAG_UNSET_PROTODOWN);
+
+		dplane_intf_update(zif->ifp);
+	}
+}
+
+static uint8_t netlink_parse_lacp_bypass(struct rtattr **linkinfo)
+{
+	uint8_t bypass = 0;
+	struct rtattr *mbrinfo[IFLA_BOND_SLAVE_MAX + 1];
+
+	netlink_parse_rtattr_nested(mbrinfo, IFLA_BOND_SLAVE_MAX,
+				    linkinfo[IFLA_INFO_SLAVE_DATA]);
+	if (mbrinfo[IFLA_BOND_SLAVE_AD_RX_BYPASS])
+		bypass = *(uint8_t *)RTA_DATA(
+			mbrinfo[IFLA_BOND_SLAVE_AD_RX_BYPASS]);
+
+	return bypass;
+}
+
+/*
+ * Only called at startup to cleanup leftover protodown reasons we may
+ * have not cleaned up. We leave protodown set though.
+ */
+static void if_sweep_protodown(struct zebra_if *zif)
+{
+	bool protodown;
+
+	protodown = !!ZEBRA_IF_IS_PROTODOWN(zif);
+
+	if (!protodown)
+		return;
+
+	if (IS_ZEBRA_DEBUG_KERNEL)
+		zlog_debug("interface %s sweeping protodown %s reason 0x%x",
+			   zif->ifp->name, protodown ? "on" : "off",
+			   zif->protodown_rc);
+
+	/* Only clear our reason codes, leave external if it was set */
+	UNSET_FLAG(zif->protodown_rc, ZEBRA_PROTODOWN_ALL);
+	dplane_intf_update(zif->ifp);
+}
+
+/*
+ * Called from interface_lookup_netlink().  This function is only used
+ * during bootstrap.
+ */
+static int netlink_interface(struct nlmsghdr *h, ns_id_t ns_id, int startup)
+{
+	int len;
+	struct ifinfomsg *ifi;
+	struct rtattr *tb[IFLA_MAX + 1];
+	struct rtattr *linkinfo[IFLA_MAX + 1];
+	struct interface *ifp;
+	char *name = NULL;
+	char *kind = NULL;
+	char *desc = NULL;
+	char *slave_kind = NULL;
+	struct zebra_ns *zns = NULL;
+	vrf_id_t vrf_id = VRF_DEFAULT;
+	enum zebra_iftype zif_type = ZEBRA_IF_OTHER;
+	enum zebra_slave_iftype zif_slave_type = ZEBRA_IF_SLAVE_NONE;
+	ifindex_t bridge_ifindex = IFINDEX_INTERNAL;
+	ifindex_t link_ifindex = IFINDEX_INTERNAL;
+	ifindex_t bond_ifindex = IFINDEX_INTERNAL;
+	struct zebra_if *zif;
+	ns_id_t link_nsid = ns_id;
+	uint8_t bypass = 0;
+
+	frrtrace(3, frr_zebra, netlink_interface, h, ns_id, startup);
+
+	zns = zebra_ns_lookup(ns_id);
+	ifi = NLMSG_DATA(h);
+
+	if (h->nlmsg_type != RTM_NEWLINK)
+		return 0;
+
+	len = h->nlmsg_len - NLMSG_LENGTH(sizeof(struct ifinfomsg));
+	if (len < 0) {
+		zlog_err(
+			"%s: Message received from netlink is of a broken size: %d %zu",
+			__func__, h->nlmsg_len,
+			(size_t)NLMSG_LENGTH(sizeof(struct ifinfomsg)));
+		return -1;
+	}
+
+	/* We are interested in some AF_BRIDGE notifications. */
+	if (ifi->ifi_family == AF_BRIDGE)
+		return netlink_bridge_interface(h, len, ns_id, startup);
+
+	/* Looking up interface name. */
+	memset(linkinfo, 0, sizeof(linkinfo));
+	netlink_parse_rtattr_flags(tb, IFLA_MAX, IFLA_RTA(ifi), len,
+				   NLA_F_NESTED);
+
+	/* check for wireless messages to ignore */
+	if ((tb[IFLA_WIRELESS] != NULL) && (ifi->ifi_change == 0)) {
+		if (IS_ZEBRA_DEBUG_KERNEL)
+			zlog_debug("%s: ignoring IFLA_WIRELESS message",
+				   __func__);
+		return 0;
+	}
+
+	if (tb[IFLA_IFNAME] == NULL)
+		return -1;
+	name = (char *)RTA_DATA(tb[IFLA_IFNAME]);
+
+	if (tb[IFLA_IFALIAS])
+		desc = (char *)RTA_DATA(tb[IFLA_IFALIAS]);
+
+	if (tb[IFLA_LINKINFO]) {
+		netlink_parse_rtattr_nested(linkinfo, IFLA_INFO_MAX,
+					    tb[IFLA_LINKINFO]);
+
+		if (linkinfo[IFLA_INFO_KIND])
+			kind = RTA_DATA(linkinfo[IFLA_INFO_KIND]);
+
+		if (linkinfo[IFLA_INFO_SLAVE_KIND])
+			slave_kind = RTA_DATA(linkinfo[IFLA_INFO_SLAVE_KIND]);
+
+		if ((slave_kind != NULL) && strcmp(slave_kind, "bond") == 0)
+			netlink_determine_zebra_iftype("bond_slave", &zif_type);
+		else
+			netlink_determine_zebra_iftype(kind, &zif_type);
+	}
+
+	/* If VRF, create the VRF structure itself. */
+	if (zif_type == ZEBRA_IF_VRF && !vrf_is_backend_netns()) {
+		netlink_vrf_change(h, tb[IFLA_LINKINFO], ns_id, name);
+		vrf_id = (vrf_id_t)ifi->ifi_index;
+	}
+
+	if (tb[IFLA_MASTER]) {
+		if (slave_kind && (strcmp(slave_kind, "vrf") == 0)
+		    && !vrf_is_backend_netns()) {
+			zif_slave_type = ZEBRA_IF_SLAVE_VRF;
+			vrf_id = *(uint32_t *)RTA_DATA(tb[IFLA_MASTER]);
+		} else if (slave_kind && (strcmp(slave_kind, "bridge") == 0)) {
+			zif_slave_type = ZEBRA_IF_SLAVE_BRIDGE;
+			bridge_ifindex =
+				*(ifindex_t *)RTA_DATA(tb[IFLA_MASTER]);
+		} else if (slave_kind && (strcmp(slave_kind, "bond") == 0)) {
+			zif_slave_type = ZEBRA_IF_SLAVE_BOND;
+			bond_ifindex = *(ifindex_t *)RTA_DATA(tb[IFLA_MASTER]);
+			bypass = netlink_parse_lacp_bypass(linkinfo);
+		} else
+			zif_slave_type = ZEBRA_IF_SLAVE_OTHER;
+	}
+	if (vrf_is_backend_netns())
+		vrf_id = (vrf_id_t)ns_id;
+
+	/* If linking to another interface, note it. */
+	if (tb[IFLA_LINK])
+		link_ifindex = *(ifindex_t *)RTA_DATA(tb[IFLA_LINK]);
+
+	if (tb[IFLA_LINK_NETNSID]) {
+		link_nsid = *(ns_id_t *)RTA_DATA(tb[IFLA_LINK_NETNSID]);
+		link_nsid = ns_id_get_absolute(ns_id, link_nsid);
+	}
+
+	ifp = if_get_by_name(name, vrf_id, NULL);
+	set_ifindex(ifp, ifi->ifi_index, zns); /* add it to ns struct */
+
+	ifp->flags = ifi->ifi_flags & 0x0000fffff;
+	ifp->mtu6 = ifp->mtu = *(uint32_t *)RTA_DATA(tb[IFLA_MTU]);
+	ifp->metric = 0;
+	ifp->speed = get_iflink_speed(ifp, NULL);
+	ifp->ptm_status = ZEBRA_PTM_STATUS_UNKNOWN;
+
+	/* Set zebra interface type */
+	zebra_if_set_ziftype(ifp, zif_type, zif_slave_type);
+	if (IS_ZEBRA_IF_VRF(ifp))
+		SET_FLAG(ifp->status, ZEBRA_INTERFACE_VRF_LOOPBACK);
+
+	/*
+	 * Just set the @link/lower-device ifindex. During nldump interfaces are
+	 * not ordered in any fashion so we may end up getting upper devices
+	 * before lower devices. We will setup the real linkage once the dump
+	 * is complete.
+	 */
+	zif = (struct zebra_if *)ifp->info;
+	zif->link_ifindex = link_ifindex;
+
+	if (desc) {
+		XFREE(MTYPE_TMP, zif->desc);
+		zif->desc = XSTRDUP(MTYPE_TMP, desc);
+	}
+
+	/* Hardware type and address. */
+	ifp->ll_type = netlink_to_zebra_link_type(ifi->ifi_type);
+
+	netlink_interface_update_hw_addr(tb, ifp);
+
+	if_add_update(ifp);
+
+	/* Extract and save L2 interface information, take additional actions.
+	 */
+	netlink_interface_update_l2info(ifp, linkinfo[IFLA_INFO_DATA],
+					1, link_nsid);
+	if (IS_ZEBRA_IF_BOND(ifp))
+		zebra_l2if_update_bond(ifp, true);
+	if (IS_ZEBRA_IF_BRIDGE_SLAVE(ifp))
+		zebra_l2if_update_bridge_slave(ifp, bridge_ifindex, ns_id,
+					       ZEBRA_BRIDGE_NO_ACTION);
+	else if (IS_ZEBRA_IF_BOND_SLAVE(ifp))
+		zebra_l2if_update_bond_slave(ifp, bond_ifindex, !!bypass);
+
+	if (tb[IFLA_PROTO_DOWN]) {
+		netlink_proc_dplane_if_protodown(zif, tb);
+		if_sweep_protodown(zif);
+	}
+
+	return 0;
+}
+
+/* Request for specific interface or address information from the kernel */
+static int netlink_request_intf_addr(struct nlsock *netlink_cmd, int family,
+				     int type, uint32_t filter_mask)
+{
+	struct {
+		struct nlmsghdr n;
+		struct ifinfomsg ifm;
+		char buf[256];
+	} req;
+
+	frrtrace(4, frr_zebra, netlink_request_intf_addr, netlink_cmd, family,
+		 type, filter_mask);
+
+	/* Form the request, specifying filter (rtattr) if needed. */
+	memset(&req, 0, sizeof(req));
+	req.n.nlmsg_type = type;
+	req.n.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST;
+	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
+	req.ifm.ifi_family = family;
+
+	/* Include filter, if specified. */
+	if (filter_mask)
+		nl_attr_put32(&req.n, sizeof(req), IFLA_EXT_MASK, filter_mask);
+
+	return netlink_request(netlink_cmd, &req);
+}
+
+enum netlink_msg_status
+netlink_put_gre_set_msg(struct nl_batch *bth, struct zebra_dplane_ctx *ctx)
+{
+	enum dplane_op_e op;
+	enum netlink_msg_status ret;
+
+	op = dplane_ctx_get_op(ctx);
+	assert(op == DPLANE_OP_GRE_SET);
+
+	ret = netlink_batch_add_msg(bth, ctx, netlink_gre_set_msg_encoder, false);
+
+	return ret;
+}
+
+/* Interface lookup by netlink socket. */
+int interface_lookup_netlink(struct zebra_ns *zns)
+{
+	int ret;
+	struct zebra_dplane_info dp_info;
+	struct nlsock *netlink_cmd = &zns->netlink_cmd;
+
+	/* Capture key info from ns struct */
+	zebra_dplane_info_from_zns(&dp_info, zns, true /*is_cmd*/);
+
+	/* Get interface information. */
+	ret = netlink_request_intf_addr(netlink_cmd, AF_PACKET, RTM_GETLINK, 0);
+	if (ret < 0)
+		return ret;
+	ret = netlink_parse_info(netlink_interface, netlink_cmd, &dp_info, 0,
+				 true);
+	if (ret < 0)
+		return ret;
+
+	/* Get interface information - for bridge interfaces. */
+	ret = netlink_request_intf_addr(netlink_cmd, AF_BRIDGE, RTM_GETLINK,
+					RTEXT_FILTER_BRVLAN);
+	if (ret < 0)
+		return ret;
+	ret = netlink_parse_info(netlink_interface, netlink_cmd, &dp_info, 0,
+				 true);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * So netlink_tunneldump_read will initiate a request
+	 * per tunnel to get data.  If we are on a kernel that
+	 * does not support this then we will get X error messages
+	 * (one per tunnel request )back which netlink_parse_info will
+	 * stop after the first one.  So we need to read equivalent
+	 * error messages per tunnel then we can continue.
+	 * if we do not gather all the read failures then
+	 * later requests will not work right.
+	 */
+	ret = netlink_tunneldump_read(zns);
+	if (ret < 0)
+		return ret;
+
+	/* fixup linkages */
+	zebra_if_update_all_links(zns);
+	return 0;
+}
+
+/**
+ * interface_addr_lookup_netlink() - Look up interface addresses
+ *
+ * @zns:	Zebra netlink socket
+ * Return:	Result status
+ */
+static int interface_addr_lookup_netlink(struct zebra_ns *zns)
+{
+	int ret;
+	struct zebra_dplane_info dp_info;
+	struct nlsock *netlink_cmd = &zns->netlink_cmd;
+
+	/* Capture key info from ns struct */
+	zebra_dplane_info_from_zns(&dp_info, zns, true /*is_cmd*/);
+
+	/* Get IPv4 address of the interfaces. */
+	ret = netlink_request_intf_addr(netlink_cmd, AF_INET, RTM_GETADDR, 0);
+	if (ret < 0)
+		return ret;
+	ret = netlink_parse_info(netlink_interface_addr, netlink_cmd, &dp_info,
+				 0, true);
+	if (ret < 0)
+		return ret;
+
+	/* Get IPv6 address of the interfaces. */
+	ret = netlink_request_intf_addr(netlink_cmd, AF_INET6, RTM_GETADDR, 0);
+	if (ret < 0)
+		return ret;
+	ret = netlink_parse_info(netlink_interface_addr, netlink_cmd, &dp_info,
+				 0, true);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+int kernel_interface_set_master(struct interface *master,
+				struct interface *slave)
+{
+	struct zebra_ns *zns = zebra_ns_lookup(NS_DEFAULT);
+
+	struct {
+		struct nlmsghdr n;
+		struct ifinfomsg ifa;
+		char buf[NL_PKT_BUF_SIZE];
+	} req;
+
+	memset(&req, 0, sizeof(req));
+
+	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
+	req.n.nlmsg_flags = NLM_F_REQUEST;
+	req.n.nlmsg_type = RTM_SETLINK;
+	req.n.nlmsg_pid = zns->netlink_cmd.snl.nl_pid;
+
+	req.ifa.ifi_index = slave->ifindex;
+
+	nl_attr_put32(&req.n, sizeof(req), IFLA_MASTER, master->ifindex);
+	nl_attr_put32(&req.n, sizeof(req), IFLA_LINK, slave->ifindex);
+
+	return netlink_talk(netlink_talk_filter, &req.n, &zns->netlink_cmd, zns,
+			    false);
+}
+
+/* Interface address modification. */
+static ssize_t netlink_address_msg_encoder(struct zebra_dplane_ctx *ctx,
+					   void *buf, size_t buflen)
+{
+	int bytelen;
+	const struct prefix *p;
+	int cmd;
+	const char *label;
+
+	struct {
+		struct nlmsghdr n;
+		struct ifaddrmsg ifa;
+		char buf[0];
+	} *req = buf;
+
+	if (buflen < sizeof(*req))
+		return 0;
+
+	p = dplane_ctx_get_intf_addr(ctx);
+	memset(req, 0, sizeof(*req));
+
+	bytelen = (p->family == AF_INET ? 4 : 16);
+
+	req->n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
+	req->n.nlmsg_flags = NLM_F_REQUEST;
+
+	if (dplane_ctx_get_op(ctx) == DPLANE_OP_ADDR_INSTALL)
+		cmd = RTM_NEWADDR;
+	else
+		cmd = RTM_DELADDR;
+
+	req->n.nlmsg_type = cmd;
+	req->ifa.ifa_family = p->family;
+
+	req->ifa.ifa_index = dplane_ctx_get_ifindex(ctx);
+
+	if (!nl_attr_put(&req->n, buflen, IFA_LOCAL, &p->u.prefix, bytelen))
+		return 0;
+
+	if (p->family == AF_INET) {
+		if (dplane_ctx_intf_is_connected(ctx)) {
+			p = dplane_ctx_get_intf_dest(ctx);
+			if (!nl_attr_put(&req->n, buflen, IFA_ADDRESS,
+					 &p->u.prefix, bytelen))
+				return 0;
+		} else if (cmd == RTM_NEWADDR) {
+			struct in_addr broad = {
+				.s_addr = ipv4_broadcast_addr(p->u.prefix4.s_addr,
+							p->prefixlen)
+			};
+			if (!nl_attr_put(&req->n, buflen, IFA_BROADCAST, &broad,
+					 bytelen))
+				return 0;
+		}
+	}
+
+	/* p is now either address or destination/bcast addr */
+	req->ifa.ifa_prefixlen = p->prefixlen;
+
+	if (dplane_ctx_intf_is_secondary(ctx))
+		SET_FLAG(req->ifa.ifa_flags, IFA_F_SECONDARY);
+
+	if (dplane_ctx_intf_has_label(ctx)) {
+		label = dplane_ctx_get_intf_label(ctx);
+		if (!nl_attr_put(&req->n, buflen, IFA_LABEL, label,
+				 strlen(label) + 1))
+			return 0;
+	}
+
+	return NLMSG_ALIGN(req->n.nlmsg_len);
+}
+
+enum netlink_msg_status
+netlink_put_address_update_msg(struct nl_batch *bth,
+			       struct zebra_dplane_ctx *ctx)
+{
+	return netlink_batch_add_msg(bth, ctx, netlink_address_msg_encoder,
+				     false);
+}
+
+static ssize_t netlink_intf_msg_encoder(struct zebra_dplane_ctx *ctx, void *buf,
+					size_t buflen)
+{
+	enum dplane_op_e op;
+	int cmd = 0;
+
+	op = dplane_ctx_get_op(ctx);
+
+	switch (op) {
+	case DPLANE_OP_INTF_UPDATE:
+		cmd = RTM_SETLINK;
+		break;
+	case DPLANE_OP_INTF_INSTALL:
+		cmd = RTM_NEWLINK;
+		break;
+	case DPLANE_OP_INTF_DELETE:
+		cmd = RTM_DELLINK;
+		break;
+	default:
+		flog_err(
+			EC_ZEBRA_NHG_FIB_UPDATE,
+			"Context received for kernel interface update with incorrect OP code (%u)",
+			op);
+		return -1;
+	}
+
+	return netlink_intf_msg_encode(cmd, ctx, buf, buflen);
+}
+
+enum netlink_msg_status
+netlink_put_intf_update_msg(struct nl_batch *bth, struct zebra_dplane_ctx *ctx)
+{
+	return netlink_batch_add_msg(bth, ctx, netlink_intf_msg_encoder, false);
+}
+
+int netlink_interface_addr(struct nlmsghdr *h, ns_id_t ns_id, int startup)
+{
+	int len;
+	struct ifaddrmsg *ifa;
+	struct rtattr *tb[IFA_MAX + 1];
+	struct interface *ifp;
+	void *addr;
+	void *broad;
+	uint8_t flags = 0;
+	char *label = NULL;
+	struct zebra_ns *zns;
+	uint32_t metric = METRIC_MAX;
+	uint32_t kernel_flags = 0;
+
+	frrtrace(3, frr_zebra, netlink_interface_addr, h, ns_id, startup);
+
+	zns = zebra_ns_lookup(ns_id);
+	ifa = NLMSG_DATA(h);
+
+	if (ifa->ifa_family != AF_INET && ifa->ifa_family != AF_INET6) {
+		flog_warn(
+			EC_ZEBRA_UNKNOWN_FAMILY,
+			"Invalid address family: %u received from kernel interface addr change: %s",
+			ifa->ifa_family, nl_msg_type_to_str(h->nlmsg_type));
+		return 0;
+	}
+
+	if (h->nlmsg_type != RTM_NEWADDR && h->nlmsg_type != RTM_DELADDR)
+		return 0;
+
+	len = h->nlmsg_len - NLMSG_LENGTH(sizeof(struct ifaddrmsg));
+	if (len < 0) {
+		zlog_err(
+			"%s: Message received from netlink is of a broken size: %d %zu",
+			__func__, h->nlmsg_len,
+			(size_t)NLMSG_LENGTH(sizeof(struct ifaddrmsg)));
+		return -1;
+	}
+
+	netlink_parse_rtattr(tb, IFA_MAX, IFA_RTA(ifa), len);
+
+	ifp = if_lookup_by_index_per_ns(zns, ifa->ifa_index);
+	if (ifp == NULL) {
+		if (startup) {
+			/* During startup, failure to lookup the referenced
+			 * interface should not be an error, so we have
+			 * downgraded this condition to warning, and we permit
+			 * the startup interface state retrieval to continue.
+			 */
+			flog_warn(EC_LIB_INTERFACE,
+				  "%s: can't find interface by index %d",
+				  __func__, ifa->ifa_index);
+			return 0;
+		} else {
+			flog_err(EC_LIB_INTERFACE,
+				 "%s: can't find interface by index %d",
+				 __func__, ifa->ifa_index);
+			return -1;
+		}
+	}
+
+	/* Flags passed through */
+	if (tb[IFA_FLAGS])
+		kernel_flags = *(int *)RTA_DATA(tb[IFA_FLAGS]);
+	else
+		kernel_flags = ifa->ifa_flags;
+
+	if (IS_ZEBRA_DEBUG_KERNEL) /* remove this line to see initial ifcfg */
+	{
+		char buf[BUFSIZ];
+		zlog_debug("%s %s %s flags 0x%x:", __func__,
+			   nl_msg_type_to_str(h->nlmsg_type), ifp->name,
+			   kernel_flags);
+		if (tb[IFA_LOCAL])
+			zlog_debug("  IFA_LOCAL     %s/%d",
+				   inet_ntop(ifa->ifa_family,
+					     RTA_DATA(tb[IFA_LOCAL]), buf,
+					     BUFSIZ),
+				   ifa->ifa_prefixlen);
+		if (tb[IFA_ADDRESS])
+			zlog_debug("  IFA_ADDRESS   %s/%d",
+				   inet_ntop(ifa->ifa_family,
+					     RTA_DATA(tb[IFA_ADDRESS]), buf,
+					     BUFSIZ),
+				   ifa->ifa_prefixlen);
+		if (tb[IFA_BROADCAST])
+			zlog_debug("  IFA_BROADCAST %s/%d",
+				   inet_ntop(ifa->ifa_family,
+					     RTA_DATA(tb[IFA_BROADCAST]), buf,
+					     BUFSIZ),
+				   ifa->ifa_prefixlen);
+		if (tb[IFA_LABEL] && strcmp(ifp->name, RTA_DATA(tb[IFA_LABEL])))
+			zlog_debug("  IFA_LABEL     %s",
+				   (char *)RTA_DATA(tb[IFA_LABEL]));
+
+		if (tb[IFA_CACHEINFO]) {
+			struct ifa_cacheinfo *ci = RTA_DATA(tb[IFA_CACHEINFO]);
+			zlog_debug("  IFA_CACHEINFO pref %d, valid %d",
+				   ci->ifa_prefered, ci->ifa_valid);
+		}
+	}
+
+	/* logic copied from iproute2/ip/ipaddress.c:print_addrinfo() */
+	if (tb[IFA_LOCAL] == NULL)
+		tb[IFA_LOCAL] = tb[IFA_ADDRESS];
+	if (tb[IFA_ADDRESS] == NULL)
+		tb[IFA_ADDRESS] = tb[IFA_LOCAL];
+
+	/* local interface address */
+	addr = (tb[IFA_LOCAL] ? RTA_DATA(tb[IFA_LOCAL]) : NULL);
+
+	/* is there a peer address? */
+	if (tb[IFA_ADDRESS]
+	    && memcmp(RTA_DATA(tb[IFA_ADDRESS]), RTA_DATA(tb[IFA_LOCAL]),
+		      RTA_PAYLOAD(tb[IFA_ADDRESS]))) {
+		broad = RTA_DATA(tb[IFA_ADDRESS]);
+		SET_FLAG(flags, ZEBRA_IFA_PEER);
+	} else
+		/* seeking a broadcast address */
+		broad = (tb[IFA_BROADCAST] ? RTA_DATA(tb[IFA_BROADCAST])
+					   : NULL);
+
+	/* addr is primary key, SOL if we don't have one */
+	if (addr == NULL) {
+		zlog_debug("%s: Local Interface Address is NULL for %s",
+			   __func__, ifp->name);
+		return -1;
+	}
+
+	/* Flags. */
+	if (kernel_flags & IFA_F_SECONDARY)
+		SET_FLAG(flags, ZEBRA_IFA_SECONDARY);
+
+	/* Label */
+	if (tb[IFA_LABEL])
+		label = (char *)RTA_DATA(tb[IFA_LABEL]);
+
+	if (label && strcmp(ifp->name, label) == 0)
+		label = NULL;
+
+	if (tb[IFA_RT_PRIORITY])
+		metric = *(uint32_t *)RTA_DATA(tb[IFA_RT_PRIORITY]);
+
+	/* Register interface address to the interface. */
+	if (ifa->ifa_family == AF_INET) {
+		if (ifa->ifa_prefixlen > IPV4_MAX_BITLEN) {
+			zlog_err(
+				"Invalid prefix length: %u received from kernel interface addr change: %s",
+				ifa->ifa_prefixlen,
+				nl_msg_type_to_str(h->nlmsg_type));
+			return -1;
+		}
+
+		if (h->nlmsg_type == RTM_NEWADDR)
+			connected_add_ipv4(ifp, flags, (struct in_addr *)addr,
+					   ifa->ifa_prefixlen,
+					   (struct in_addr *)broad, label,
+					   metric);
+		else if (CHECK_FLAG(flags, ZEBRA_IFA_PEER)) {
+			/* Delete with a peer address */
+			connected_delete_ipv4(
+				ifp, flags, (struct in_addr *)addr,
+				ifa->ifa_prefixlen, broad);
+		} else
+			connected_delete_ipv4(
+				ifp, flags, (struct in_addr *)addr,
+				ifa->ifa_prefixlen, NULL);
+	}
+
+	if (ifa->ifa_family == AF_INET6) {
+		if (ifa->ifa_prefixlen > IPV6_MAX_BITLEN) {
+			zlog_err(
+				"Invalid prefix length: %u received from kernel interface addr change: %s",
+				ifa->ifa_prefixlen,
+				nl_msg_type_to_str(h->nlmsg_type));
+			return -1;
+		}
+		if (h->nlmsg_type == RTM_NEWADDR) {
+			/* Only consider valid addresses; we'll not get a
+			 * notification from
+			 * the kernel till IPv6 DAD has completed, but at init
+			 * time, Quagga
+			 * does query for and will receive all addresses.
+			 */
+			if (!(kernel_flags
+			      & (IFA_F_DADFAILED | IFA_F_TENTATIVE)))
+				connected_add_ipv6(ifp, flags,
+						   (struct in6_addr *)addr,
+						   (struct in6_addr *)broad,
+						   ifa->ifa_prefixlen, label,
+						   metric);
+		} else
+			connected_delete_ipv6(ifp, (struct in6_addr *)addr,
+					      NULL, ifa->ifa_prefixlen);
+	}
+
+	/*
+	 * Linux kernel does not send route delete on interface down/addr del
+	 * so we have to re-process routes it owns (i.e. kernel routes)
+	 */
+	if (h->nlmsg_type != RTM_NEWADDR)
+		rib_update(RIB_UPDATE_KERNEL);
+
+	return 0;
+}
+
+/*
+ * Parse and validate an incoming interface address change message,
+ * generating a dplane context object.
+ * This runs in the dplane pthread; the context is enqueued to the
+ * main pthread for processing.
+ */
+int netlink_interface_addr_dplane(struct nlmsghdr *h, ns_id_t ns_id,
+				  int startup /*ignored*/)
+{
+	int len;
+	struct ifaddrmsg *ifa;
+	struct rtattr *tb[IFA_MAX + 1];
+	void *addr;
+	void *broad;
+	char *label = NULL;
+	uint32_t metric = METRIC_MAX;
+	uint32_t kernel_flags = 0;
+	struct zebra_dplane_ctx *ctx;
+	struct prefix p;
+
+	ifa = NLMSG_DATA(h);
+
+	/* Validate message types */
+	if (h->nlmsg_type != RTM_NEWADDR && h->nlmsg_type != RTM_DELADDR)
+		return 0;
+
+	if (ifa->ifa_family != AF_INET && ifa->ifa_family != AF_INET6) {
+		if (IS_ZEBRA_DEBUG_KERNEL)
+			zlog_debug("%s: %s: Invalid address family: %u",
+				   __func__, nl_msg_type_to_str(h->nlmsg_type),
+				   ifa->ifa_family);
+		return 0;
+	}
+
+	len = h->nlmsg_len - NLMSG_LENGTH(sizeof(struct ifaddrmsg));
+	if (len < 0) {
+		if (IS_ZEBRA_DEBUG_KERNEL)
+			zlog_debug("%s: %s: netlink msg bad size: %d %zu",
+				   __func__, nl_msg_type_to_str(h->nlmsg_type),
+				   h->nlmsg_len,
+				   (size_t)NLMSG_LENGTH(
+					   sizeof(struct ifaddrmsg)));
+		return -1;
+	}
+
+	netlink_parse_rtattr(tb, IFA_MAX, IFA_RTA(ifa), len);
+
+	/* Flags passed through */
+	if (tb[IFA_FLAGS])
+		kernel_flags = *(int *)RTA_DATA(tb[IFA_FLAGS]);
+	else
+		kernel_flags = ifa->ifa_flags;
+
+	if (IS_ZEBRA_DEBUG_KERNEL) { /* remove this line to see initial ifcfg */
+		char buf[PREFIX_STRLEN];
+
+		zlog_debug("%s: %s nsid %u ifindex %u flags 0x%x:", __func__,
+			   nl_msg_type_to_str(h->nlmsg_type), ns_id,
+			   ifa->ifa_index, kernel_flags);
+		if (tb[IFA_LOCAL])
+			zlog_debug("  IFA_LOCAL     %s/%d",
+				   inet_ntop(ifa->ifa_family,
+					     RTA_DATA(tb[IFA_LOCAL]), buf,
+					     sizeof(buf)),
+				   ifa->ifa_prefixlen);
+		if (tb[IFA_ADDRESS])
+			zlog_debug("  IFA_ADDRESS   %s/%d",
+				   inet_ntop(ifa->ifa_family,
+					     RTA_DATA(tb[IFA_ADDRESS]), buf,
+					     sizeof(buf)),
+				   ifa->ifa_prefixlen);
+		if (tb[IFA_BROADCAST])
+			zlog_debug("  IFA_BROADCAST %s/%d",
+				   inet_ntop(ifa->ifa_family,
+					     RTA_DATA(tb[IFA_BROADCAST]), buf,
+					     sizeof(buf)),
+				   ifa->ifa_prefixlen);
+		if (tb[IFA_LABEL])
+			zlog_debug("  IFA_LABEL     %s",
+				   (const char *)RTA_DATA(tb[IFA_LABEL]));
+
+		if (tb[IFA_CACHEINFO]) {
+			struct ifa_cacheinfo *ci = RTA_DATA(tb[IFA_CACHEINFO]);
+
+			zlog_debug("  IFA_CACHEINFO pref %d, valid %d",
+				   ci->ifa_prefered, ci->ifa_valid);
+		}
+	}
+
+	/* Validate prefix length */
+
+	if (ifa->ifa_family == AF_INET
+	    && ifa->ifa_prefixlen > IPV4_MAX_BITLEN) {
+		if (IS_ZEBRA_DEBUG_KERNEL)
+			zlog_debug("%s: %s: Invalid prefix length: %u",
+				   __func__, nl_msg_type_to_str(h->nlmsg_type),
+				   ifa->ifa_prefixlen);
+		return -1;
+	}
+
+	if (ifa->ifa_family == AF_INET6) {
+		if (ifa->ifa_prefixlen > IPV6_MAX_BITLEN) {
+			if (IS_ZEBRA_DEBUG_KERNEL)
+				zlog_debug("%s: %s: Invalid prefix length: %u",
+					   __func__,
+					   nl_msg_type_to_str(h->nlmsg_type),
+					   ifa->ifa_prefixlen);
+			return -1;
+		}
+
+		/* Only consider valid addresses; we'll not get a kernel
+		 * notification till IPv6 DAD has completed, but at init
+		 * time, FRR does query for and will receive all addresses.
+		 */
+		if (h->nlmsg_type == RTM_NEWADDR
+		    && (kernel_flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))) {
+			if (IS_ZEBRA_DEBUG_KERNEL)
+				zlog_debug("%s: %s: Invalid/tentative addr",
+					   __func__,
+					   nl_msg_type_to_str(h->nlmsg_type));
+			return 0;
+		}
+	}
+
+	/* logic copied from iproute2/ip/ipaddress.c:print_addrinfo() */
+	if (tb[IFA_LOCAL] == NULL)
+		tb[IFA_LOCAL] = tb[IFA_ADDRESS];
+	if (tb[IFA_ADDRESS] == NULL)
+		tb[IFA_ADDRESS] = tb[IFA_LOCAL];
+
+	/* local interface address */
+	addr = (tb[IFA_LOCAL] ? RTA_DATA(tb[IFA_LOCAL]) : NULL);
+
+	/* addr is primary key, SOL if we don't have one */
+	if (addr == NULL) {
+		if (IS_ZEBRA_DEBUG_KERNEL)
+			zlog_debug("%s: %s: No local interface address",
+				   __func__, nl_msg_type_to_str(h->nlmsg_type));
+		return -1;
+	}
+
+	/* Allocate a context object, now that validation is done. */
+	ctx = dplane_ctx_alloc();
+	if (h->nlmsg_type == RTM_NEWADDR)
+		dplane_ctx_set_op(ctx, DPLANE_OP_INTF_ADDR_ADD);
+	else
+		dplane_ctx_set_op(ctx, DPLANE_OP_INTF_ADDR_DEL);
+
+	dplane_ctx_set_ifindex(ctx, ifa->ifa_index);
+	dplane_ctx_set_ns_id(ctx, ns_id);
+
+	/* Convert addr to prefix */
+	memset(&p, 0, sizeof(p));
+	p.family = ifa->ifa_family;
+	p.prefixlen = ifa->ifa_prefixlen;
+	if (p.family == AF_INET)
+		p.u.prefix4 = *(struct in_addr *)addr;
+	else
+		p.u.prefix6 = *(struct in6_addr *)addr;
+
+	dplane_ctx_set_intf_addr(ctx, &p);
+
+	/* is there a peer address? */
+	if (tb[IFA_ADDRESS]
+	    && memcmp(RTA_DATA(tb[IFA_ADDRESS]), RTA_DATA(tb[IFA_LOCAL]),
+		      RTA_PAYLOAD(tb[IFA_ADDRESS]))) {
+		broad = RTA_DATA(tb[IFA_ADDRESS]);
+		dplane_ctx_intf_set_connected(ctx);
+	} else if (tb[IFA_BROADCAST]) {
+		/* seeking a broadcast address */
+		broad = RTA_DATA(tb[IFA_BROADCAST]);
+		dplane_ctx_intf_set_broadcast(ctx);
+	} else
+		broad = NULL;
+
+	if (broad) {
+		/* Convert addr to prefix */
+		memset(&p, 0, sizeof(p));
+		p.family = ifa->ifa_family;
+		p.prefixlen = ifa->ifa_prefixlen;
+		if (p.family == AF_INET)
+			p.u.prefix4 = *(struct in_addr *)broad;
+		else
+			p.u.prefix6 = *(struct in6_addr *)broad;
+
+		dplane_ctx_set_intf_dest(ctx, &p);
+	}
+
+	/* Flags. */
+	if (kernel_flags & IFA_F_SECONDARY)
+		dplane_ctx_intf_set_secondary(ctx);
+
+	/* Label */
+	if (tb[IFA_LABEL]) {
+		label = (char *)RTA_DATA(tb[IFA_LABEL]);
+		dplane_ctx_set_intf_label(ctx, label);
+	}
+
+	if (tb[IFA_RT_PRIORITY])
+		metric = *(uint32_t *)RTA_DATA(tb[IFA_RT_PRIORITY]);
+
+	dplane_ctx_set_intf_metric(ctx, metric);
+
+	/* Enqueue ctx for main pthread to process */
+	dplane_provider_enqueue_to_zebra(ctx);
+
+	return 0;
+}
+
+int netlink_link_change(struct nlmsghdr *h, ns_id_t ns_id, int startup)
+{
+	int len;
+	struct ifinfomsg *ifi;
+	struct rtattr *tb[IFLA_MAX + 1];
+	struct rtattr *linkinfo[IFLA_MAX + 1];
+	struct interface *ifp;
+	char *name = NULL;
+	char *kind = NULL;
+	char *desc = NULL;
+	char *slave_kind = NULL;
+	struct zebra_ns *zns;
+	vrf_id_t vrf_id = VRF_DEFAULT;
+	enum zebra_iftype zif_type = ZEBRA_IF_OTHER;
+	enum zebra_slave_iftype zif_slave_type = ZEBRA_IF_SLAVE_NONE;
+	ifindex_t bridge_ifindex = IFINDEX_INTERNAL;
+	ifindex_t bond_ifindex = IFINDEX_INTERNAL;
+	ifindex_t link_ifindex = IFINDEX_INTERNAL;
+	uint8_t old_hw_addr[INTERFACE_HWADDR_MAX];
+	struct zebra_if *zif;
+	ns_id_t link_nsid = ns_id;
+	ifindex_t master_infindex = IFINDEX_INTERNAL;
+	uint8_t bypass = 0;
+
+	zns = zebra_ns_lookup(ns_id);
+	ifi = NLMSG_DATA(h);
+
+	/* assume if not default zns, then new VRF */
+	if (!(h->nlmsg_type == RTM_NEWLINK || h->nlmsg_type == RTM_DELLINK)) {
+		/* If this is not link add/delete message so print warning. */
+		zlog_debug("%s: wrong kernel message %s", __func__,
+			   nl_msg_type_to_str(h->nlmsg_type));
+		return 0;
+	}
+
+	if (!(ifi->ifi_family == AF_UNSPEC || ifi->ifi_family == AF_BRIDGE
+	      || ifi->ifi_family == AF_INET6)) {
+		flog_warn(
+			EC_ZEBRA_UNKNOWN_FAMILY,
+			"Invalid address family: %u received from kernel link change: %s",
+			ifi->ifi_family, nl_msg_type_to_str(h->nlmsg_type));
+		return 0;
+	}
+
+	len = h->nlmsg_len - NLMSG_LENGTH(sizeof(struct ifinfomsg));
+	if (len < 0) {
+		zlog_err(
+			"%s: Message received from netlink is of a broken size %d %zu",
+			__func__, h->nlmsg_len,
+			(size_t)NLMSG_LENGTH(sizeof(struct ifinfomsg)));
+		return -1;
+	}
+
+	/* We are interested in some AF_BRIDGE notifications. */
+	if (ifi->ifi_family == AF_BRIDGE)
+		return netlink_bridge_interface(h, len, ns_id, startup);
+
+	/* Looking up interface name. */
+	memset(linkinfo, 0, sizeof(linkinfo));
+	netlink_parse_rtattr_flags(tb, IFLA_MAX, IFLA_RTA(ifi), len,
+				   NLA_F_NESTED);
+
+	/* check for wireless messages to ignore */
+	if ((tb[IFLA_WIRELESS] != NULL) && (ifi->ifi_change == 0)) {
+		if (IS_ZEBRA_DEBUG_KERNEL)
+			zlog_debug("%s: ignoring IFLA_WIRELESS message",
+				   __func__);
+		return 0;
+	}
+
+	if (tb[IFLA_IFNAME] == NULL)
+		return -1;
+	name = (char *)RTA_DATA(tb[IFLA_IFNAME]);
+
+	/* Must be valid string. */
+	len = RTA_PAYLOAD(tb[IFLA_IFNAME]);
+	if (len < 2 || name[len - 1] != '\0') {
+		if (IS_ZEBRA_DEBUG_KERNEL)
+			zlog_debug("%s: invalid intf name", __func__);
+		return -1;
+	}
+
+	if (tb[IFLA_LINKINFO]) {
+		netlink_parse_rtattr_nested(linkinfo, IFLA_INFO_MAX,
+					    tb[IFLA_LINKINFO]);
+
+		if (linkinfo[IFLA_INFO_KIND])
+			kind = RTA_DATA(linkinfo[IFLA_INFO_KIND]);
+
+		if (linkinfo[IFLA_INFO_SLAVE_KIND])
+			slave_kind = RTA_DATA(linkinfo[IFLA_INFO_SLAVE_KIND]);
+
+		netlink_determine_zebra_iftype(kind, &zif_type);
+	}
+
+	/* If linking to another interface, note it. */
+	if (tb[IFLA_LINK])
+		link_ifindex = *(ifindex_t *)RTA_DATA(tb[IFLA_LINK]);
+
+	if (tb[IFLA_LINK_NETNSID]) {
+		link_nsid = *(ns_id_t *)RTA_DATA(tb[IFLA_LINK_NETNSID]);
+		link_nsid = ns_id_get_absolute(ns_id, link_nsid);
+	}
+	if (tb[IFLA_IFALIAS]) {
+		desc = (char *)RTA_DATA(tb[IFLA_IFALIAS]);
+	}
+
+	/* See if interface is present. */
+	ifp = if_lookup_by_name_per_ns(zns, name);
+
+	if (h->nlmsg_type == RTM_NEWLINK) {
+		/* If VRF, create or update the VRF structure itself. */
+		if (zif_type == ZEBRA_IF_VRF && !vrf_is_backend_netns()) {
+			netlink_vrf_change(h, tb[IFLA_LINKINFO], ns_id, name);
+			vrf_id = (vrf_id_t)ifi->ifi_index;
+		}
+
+		if (tb[IFLA_MASTER]) {
+			if (slave_kind && (strcmp(slave_kind, "vrf") == 0)
+			    && !vrf_is_backend_netns()) {
+				zif_slave_type = ZEBRA_IF_SLAVE_VRF;
+				master_infindex = vrf_id =
+					*(uint32_t *)RTA_DATA(tb[IFLA_MASTER]);
+			} else if (slave_kind
+				   && (strcmp(slave_kind, "bridge") == 0)) {
+				zif_slave_type = ZEBRA_IF_SLAVE_BRIDGE;
+				master_infindex = bridge_ifindex =
+					*(ifindex_t *)RTA_DATA(tb[IFLA_MASTER]);
+			} else if (slave_kind
+				   && (strcmp(slave_kind, "bond") == 0)) {
+				zif_slave_type = ZEBRA_IF_SLAVE_BOND;
+				master_infindex = bond_ifindex =
+					*(ifindex_t *)RTA_DATA(tb[IFLA_MASTER]);
+				bypass = netlink_parse_lacp_bypass(linkinfo);
+			} else
+				zif_slave_type = ZEBRA_IF_SLAVE_OTHER;
+		}
+		if (vrf_is_backend_netns())
+			vrf_id = (vrf_id_t)ns_id;
+		if (ifp == NULL
+		    || !CHECK_FLAG(ifp->status, ZEBRA_INTERFACE_ACTIVE)) {
+			/* Add interface notification from kernel */
+			if (IS_ZEBRA_DEBUG_KERNEL)
+				zlog_debug(
+					"RTM_NEWLINK ADD for %s(%u) vrf_id %u type %d sl_type %d master %u flags 0x%x",
+					name, ifi->ifi_index, vrf_id, zif_type,
+					zif_slave_type, master_infindex,
+					ifi->ifi_flags);
+
+			if (ifp == NULL) {
+				/* unknown interface */
+				ifp = if_get_by_name(name, vrf_id, NULL);
+			} else {
+				/* pre-configured interface, learnt now */
+				if (ifp->vrf->vrf_id != vrf_id)
+					if_update_to_new_vrf(ifp, vrf_id);
+			}
+
+			/* Update interface information. */
+			set_ifindex(ifp, ifi->ifi_index, zns);
+			ifp->flags = ifi->ifi_flags & 0x0000fffff;
+			if (!tb[IFLA_MTU]) {
+				zlog_debug(
+					"RTM_NEWLINK for interface %s(%u) without MTU set",
+					name, ifi->ifi_index);
+				return 0;
+			}
+			ifp->mtu6 = ifp->mtu = *(int *)RTA_DATA(tb[IFLA_MTU]);
+			ifp->metric = 0;
+			ifp->ptm_status = ZEBRA_PTM_STATUS_UNKNOWN;
+
+			/* Set interface type */
+			zebra_if_set_ziftype(ifp, zif_type, zif_slave_type);
+			if (IS_ZEBRA_IF_VRF(ifp))
+				SET_FLAG(ifp->status,
+					 ZEBRA_INTERFACE_VRF_LOOPBACK);
+
+			/* Update link. */
+			zebra_if_update_link(ifp, link_ifindex, link_nsid);
+
+			ifp->ll_type =
+				netlink_to_zebra_link_type(ifi->ifi_type);
+			netlink_interface_update_hw_addr(tb, ifp);
+
+			/* Inform clients, install any configured addresses. */
+			if_add_update(ifp);
+
+			/* Extract and save L2 interface information, take
+			 * additional actions. */
+			netlink_interface_update_l2info(
+				ifp, linkinfo[IFLA_INFO_DATA],
+				1, link_nsid);
+			if (IS_ZEBRA_IF_BRIDGE_SLAVE(ifp))
+				zebra_l2if_update_bridge_slave(
+					ifp, bridge_ifindex, ns_id,
+					ZEBRA_BRIDGE_NO_ACTION);
+			else if (IS_ZEBRA_IF_BOND_SLAVE(ifp))
+				zebra_l2if_update_bond_slave(ifp, bond_ifindex,
+							     !!bypass);
+
+			if (tb[IFLA_PROTO_DOWN])
+				netlink_proc_dplane_if_protodown(ifp->info, tb);
+			if (IS_ZEBRA_IF_BRIDGE(ifp)) {
+				zif = ifp->info;
+				if (IS_ZEBRA_DEBUG_KERNEL)
+					zlog_debug(
+						"RTM_NEWLINK ADD for %s(%u), vlan-aware %d",
+						name, ifp->ifindex,
+						IS_ZEBRA_IF_BRIDGE_VLAN_AWARE(
+							zif));
+			}
+		} else if (ifp->vrf->vrf_id != vrf_id) {
+			/* VRF change for an interface. */
+			if (IS_ZEBRA_DEBUG_KERNEL)
+				zlog_debug(
+					"RTM_NEWLINK vrf-change for %s(%u) vrf_id %u -> %u flags 0x%x",
+					name, ifp->ifindex, ifp->vrf->vrf_id,
+					vrf_id, ifi->ifi_flags);
+
+			if_handle_vrf_change(ifp, vrf_id);
+		} else {
+			bool was_bridge_slave, was_bond_slave;
+			uint8_t chgflags = ZEBRA_BRIDGE_NO_ACTION;
+			zif = ifp->info;
+
+			/* Interface update. */
+			if (IS_ZEBRA_DEBUG_KERNEL)
+				zlog_debug(
+					"RTM_NEWLINK update for %s(%u) sl_type %d master %u flags 0x%x",
+					name, ifp->ifindex, zif_slave_type,
+					master_infindex, ifi->ifi_flags);
+
+			set_ifindex(ifp, ifi->ifi_index, zns);
+			if (!tb[IFLA_MTU]) {
+				zlog_debug(
+					"RTM_NEWLINK for interface %s(%u) without MTU set",
+					name, ifi->ifi_index);
+				return 0;
+			}
+			ifp->mtu6 = ifp->mtu = *(int *)RTA_DATA(tb[IFLA_MTU]);
+			ifp->metric = 0;
+
+			/* Update interface type - NOTE: Only slave_type can
+			 * change. */
+			was_bridge_slave = IS_ZEBRA_IF_BRIDGE_SLAVE(ifp);
+			was_bond_slave = IS_ZEBRA_IF_BOND_SLAVE(ifp);
+			zebra_if_set_ziftype(ifp, zif_type, zif_slave_type);
+
+			memcpy(old_hw_addr, ifp->hw_addr, INTERFACE_HWADDR_MAX);
+
+			/* Update link. */
+			zebra_if_update_link(ifp, link_ifindex, link_nsid);
+
+			ifp->ll_type =
+				netlink_to_zebra_link_type(ifi->ifi_type);
+			netlink_interface_update_hw_addr(tb, ifp);
+
+			if (tb[IFLA_PROTO_DOWN])
+				netlink_proc_dplane_if_protodown(ifp->info, tb);
+
+			if (if_is_no_ptm_operative(ifp)) {
+				bool is_up = if_is_operative(ifp);
+				ifp->flags = ifi->ifi_flags & 0x0000fffff;
+				if (!if_is_no_ptm_operative(ifp) ||
+				    CHECK_FLAG(zif->flags,
+					       ZIF_FLAG_PROTODOWN)) {
+					if (IS_ZEBRA_DEBUG_KERNEL)
+						zlog_debug(
+							"Intf %s(%u) has gone DOWN",
+							name, ifp->ifindex);
+					if_down(ifp);
+					rib_update(RIB_UPDATE_KERNEL);
+				} else if (if_is_operative(ifp)) {
+					bool mac_updated = false;
+
+					/* Must notify client daemons of new
+					 * interface status. */
+					if (IS_ZEBRA_DEBUG_KERNEL)
+						zlog_debug(
+							"Intf %s(%u) PTM up, notifying clients",
+							name, ifp->ifindex);
+					if_up(ifp, !is_up);
+
+					/* Update EVPN VNI when SVI MAC change
+					 */
+					if (memcmp(old_hw_addr, ifp->hw_addr,
+						   INTERFACE_HWADDR_MAX))
+						mac_updated = true;
+					if (IS_ZEBRA_IF_VLAN(ifp)
+					    && mac_updated) {
+						struct interface *link_if;
+
+						link_if =
+						if_lookup_by_index_per_ns(
+						zebra_ns_lookup(NS_DEFAULT),
+								link_ifindex);
+						if (link_if)
+							zebra_vxlan_svi_up(ifp,
+								link_if);
+					} else if (mac_updated
+						   && IS_ZEBRA_IF_BRIDGE(ifp)) {
+						zlog_debug(
+							"Intf %s(%u) bridge changed MAC address",
+							name, ifp->ifindex);
+						chgflags =
+							ZEBRA_BRIDGE_MASTER_MAC_CHANGE;
+					}
+				}
+			} else {
+				ifp->flags = ifi->ifi_flags & 0x0000fffff;
+				if (if_is_operative(ifp) &&
+				    !CHECK_FLAG(zif->flags,
+						ZIF_FLAG_PROTODOWN)) {
+					if (IS_ZEBRA_DEBUG_KERNEL)
+						zlog_debug(
+							"Intf %s(%u) has come UP",
+							name, ifp->ifindex);
+					if_up(ifp, true);
+					if (IS_ZEBRA_IF_BRIDGE(ifp))
+						chgflags =
+							ZEBRA_BRIDGE_MASTER_UP;
+				} else {
+					if (IS_ZEBRA_DEBUG_KERNEL)
+						zlog_debug(
+							"Intf %s(%u) has gone DOWN",
+							name, ifp->ifindex);
+					if_down(ifp);
+					rib_update(RIB_UPDATE_KERNEL);
+				}
+			}
+
+			/* Extract and save L2 interface information, take
+			 * additional actions. */
+			netlink_interface_update_l2info(
+				ifp, linkinfo[IFLA_INFO_DATA],
+				0, link_nsid);
+			if (IS_ZEBRA_IF_BRIDGE(ifp))
+				zebra_l2if_update_bridge(ifp, chgflags);
+			if (IS_ZEBRA_IF_BOND(ifp))
+				zebra_l2if_update_bond(ifp, true);
+			if (IS_ZEBRA_IF_BRIDGE_SLAVE(ifp) || was_bridge_slave)
+				zebra_l2if_update_bridge_slave(
+					ifp, bridge_ifindex, ns_id, chgflags);
+			else if (IS_ZEBRA_IF_BOND_SLAVE(ifp) || was_bond_slave)
+				zebra_l2if_update_bond_slave(ifp, bond_ifindex,
+							     !!bypass);
+			if (IS_ZEBRA_IF_BRIDGE(ifp)) {
+				if (IS_ZEBRA_DEBUG_KERNEL)
+					zlog_debug(
+						"RTM_NEWLINK update for %s(%u), vlan-aware %d",
+						name, ifp->ifindex,
+						IS_ZEBRA_IF_BRIDGE_VLAN_AWARE(
+							zif));
+			}
+		}
+
+		zif = ifp->info;
+		if (zif) {
+			XFREE(MTYPE_TMP, zif->desc);
+			if (desc)
+				zif->desc = XSTRDUP(MTYPE_TMP, desc);
+		}
+	} else {
+		/* Delete interface notification from kernel */
+		if (ifp == NULL) {
+			if (IS_ZEBRA_DEBUG_KERNEL)
+				zlog_debug(
+					"RTM_DELLINK for unknown interface %s(%u)",
+					name, ifi->ifi_index);
+			return 0;
+		}
+
+		if (IS_ZEBRA_DEBUG_KERNEL)
+			zlog_debug("RTM_DELLINK for %s(%u)", name,
+				   ifp->ifindex);
+
+		UNSET_FLAG(ifp->status, ZEBRA_INTERFACE_VRF_LOOPBACK);
+
+		if (IS_ZEBRA_IF_BOND(ifp))
+			zebra_l2if_update_bond(ifp, false);
+		if (IS_ZEBRA_IF_BOND_SLAVE(ifp))
+			zebra_l2if_update_bond_slave(ifp, bond_ifindex, false);
+		/* Special handling for bridge or VxLAN interfaces. */
+		if (IS_ZEBRA_IF_BRIDGE(ifp))
+			zebra_l2_bridge_del(ifp);
+		else if (IS_ZEBRA_IF_VXLAN(ifp))
+			zebra_l2_vxlanif_del(ifp);
+
+		if_delete_update(&ifp);
+
+		/* If VRF, delete the VRF structure itself. */
+		if (zif_type == ZEBRA_IF_VRF && !vrf_is_backend_netns())
+			netlink_vrf_change(h, tb[IFLA_LINKINFO], ns_id, name);
+	}
+
+	return 0;
+}
+
+/**
+ * Interface encoding helper function.
+ *
+ * \param[in] cmd netlink command.
+ * \param[in] ctx dataplane context (information snapshot).
+ * \param[out] buf buffer to hold the packet.
+ * \param[in] buflen amount of buffer bytes.
+ */
+
+ssize_t netlink_intf_msg_encode(uint16_t cmd,
+				const struct zebra_dplane_ctx *ctx, void *buf,
+				size_t buflen)
+{
+	struct {
+		struct nlmsghdr n;
+		struct ifinfomsg ifa;
+		char buf[];
+	} *req = buf;
+
+	struct rtattr *nest_protodown_reason;
+	ifindex_t ifindex = dplane_ctx_get_ifindex(ctx);
+	bool down = dplane_ctx_intf_is_protodown(ctx);
+	bool pd_reason_val = dplane_ctx_get_intf_pd_reason_val(ctx);
+	struct nlsock *nl =
+		kernel_netlink_nlsock_lookup(dplane_ctx_get_ns_sock(ctx));
+
+	if (buflen < sizeof(*req))
+		return 0;
+
+	memset(req, 0, sizeof(*req));
+
+	if (cmd != RTM_SETLINK)
+		flog_err(
+			EC_ZEBRA_INTF_UPDATE_FAILURE,
+			"Only RTM_SETLINK message type currently supported in dplane pthread");
+
+	req->n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
+	req->n.nlmsg_flags = NLM_F_REQUEST;
+	req->n.nlmsg_type = cmd;
+	req->n.nlmsg_pid = nl->snl.nl_pid;
+
+	req->ifa.ifi_index = ifindex;
+
+	nl_attr_put8(&req->n, buflen, IFLA_PROTO_DOWN, down);
+	nl_attr_put32(&req->n, buflen, IFLA_LINK, ifindex);
+
+	/* Reason info nest */
+	nest_protodown_reason =
+		nl_attr_nest(&req->n, buflen, IFLA_PROTO_DOWN_REASON);
+
+	if (!nest_protodown_reason)
+		return -1;
+
+	nl_attr_put32(&req->n, buflen, IFLA_PROTO_DOWN_REASON_MASK,
+		      (1 << frr_protodown_r_bit));
+	nl_attr_put32(&req->n, buflen, IFLA_PROTO_DOWN_REASON_VALUE,
+		      ((int)pd_reason_val) << frr_protodown_r_bit);
+
+	nl_attr_nest_end(&req->n, nest_protodown_reason);
+
+	if (IS_ZEBRA_DEBUG_KERNEL)
+		zlog_debug("%s: %s, protodown=%d reason_val=%d ifindex=%u",
+			   __func__, nl_msg_type_to_str(cmd), down,
+			   pd_reason_val, ifindex);
+
+	return NLMSG_ALIGN(req->n.nlmsg_len);
+}
+
+/* Interface information read by netlink. */
+void interface_list(struct zebra_ns *zns)
+{
+	interface_lookup_netlink(zns);
+	/* We add routes for interface address,
+	 * so we need to get the nexthop info
+	 * from the kernel before we can do that
+	 */
+	netlink_nexthop_read(zns);
+
+	interface_addr_lookup_netlink(zns);
+}
+
+void if_netlink_set_frr_protodown_r_bit(uint8_t bit)
+{
+	if (IS_ZEBRA_DEBUG_KERNEL)
+		zlog_debug(
+			"Protodown reason bit index changed: bit-index %u -> bit-index %u",
+			frr_protodown_r_bit, bit);
+
+	frr_protodown_r_bit = bit;
+}
+
+void if_netlink_unset_frr_protodown_r_bit(void)
+{
+	if (IS_ZEBRA_DEBUG_KERNEL)
+		zlog_debug(
+			"Protodown reason bit index changed: bit-index %u -> bit-index %u",
+			frr_protodown_r_bit, FRR_PROTODOWN_REASON_DEFAULT_BIT);
+
+	frr_protodown_r_bit = FRR_PROTODOWN_REASON_DEFAULT_BIT;
+}
+
+
+bool if_netlink_frr_protodown_r_bit_is_set(void)
+{
+	return (frr_protodown_r_bit != FRR_PROTODOWN_REASON_DEFAULT_BIT);
+}
+
+uint8_t if_netlink_get_frr_protodown_r_bit(void)
+{
+	return frr_protodown_r_bit;
+}
+
+/**
+ * netlink_request_tunneldump() - Request all tunnels from the linux kernel
+ *
+ * @zns:	Zebra namespace
+ * @family:	AF_* netlink family
+ * @type:	RTM_* (RTM_GETTUNNEL) route type
+ *
+ * Return:	Result status
+ */
+static int netlink_request_tunneldump(struct zebra_ns *zns, int family,
+				      int ifindex)
+{
+	struct {
+		struct nlmsghdr n;
+		struct tunnel_msg tmsg;
+		char buf[256];
+	} req;
+
+	/* Form the request */
+	memset(&req, 0, sizeof(req));
+	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tunnel_msg));
+	req.n.nlmsg_type = RTM_GETTUNNEL;
+	req.n.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST;
+	req.tmsg.family = family;
+	req.tmsg.ifindex = ifindex;
+
+	return netlink_request(&zns->netlink_cmd, &req);
+}
+
+/*
+ * Currently we only ask for vxlan l3svd vni information.
+ * In the future this can be expanded.
+ */
+int netlink_tunneldump_read(struct zebra_ns *zns)
+{
+	int ret = 0;
+	struct zebra_dplane_info dp_info;
+	struct route_node *rn;
+	struct interface *tmp_if = NULL;
+	struct zebra_if *zif;
+	struct nlsock *netlink_cmd = &zns->netlink_cmd;
+
+	zebra_dplane_info_from_zns(&dp_info, zns, true /*is_cmd*/);
+
+	for (rn = route_top(zns->if_table); rn; rn = route_next(rn)) {
+		tmp_if = (struct interface *)rn->info;
+		if (!tmp_if)
+			continue;
+		zif = tmp_if->info;
+		if (!zif || zif->zif_type != ZEBRA_IF_VXLAN)
+			continue;
+
+		ret = netlink_request_tunneldump(zns, PF_BRIDGE,
+						 tmp_if->ifindex);
+		if (ret < 0)
+			return ret;
+
+		ret = netlink_parse_info(netlink_interface, netlink_cmd,
+					 &dp_info, 0, true);
+
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+#endif /* GNU_LINUX */