Adding upstream version 9.1.upstream/9.1

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

1 files changed, 887 insertions, 0 deletions

diff --git a/bgpd/rfapi/vnc_zebra.c b/bgpd/rfapi/vnc_zebra.c
new file mode 100644
index 0000000..c886bee
--- /dev/null
+++ b/bgpd/rfapi/vnc_zebra.c
@@ -0,0 +1,887 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *
+ * Copyright 2009-2016, LabN Consulting, L.L.C.
+ *
+ */
+
+/*
+ * File:	vnc_zebra.c
+ * Purpose:	Handle exchange of routes between VNC and Zebra
+ */
+
+#include "lib/zebra.h"
+#include "lib/prefix.h"
+#include "lib/agg_table.h"
+#include "lib/log.h"
+#include "lib/command.h"
+#include "lib/zclient.h"
+#include "lib/stream.h"
+#include "lib/ringbuf.h"
+#include "lib/memory.h"
+#include "lib/lib_errors.h"
+
+#include "bgpd/bgpd.h"
+#include "bgpd/bgp_ecommunity.h"
+#include "bgpd/bgp_route.h"
+#include "bgpd/bgp_debug.h"
+#include "bgpd/bgp_advertise.h"
+
+#include "bgpd/rfapi/bgp_rfapi_cfg.h"
+#include "bgpd/rfapi/rfapi.h"
+#include "bgpd/rfapi/rfapi_import.h"
+#include "bgpd/rfapi/rfapi_private.h"
+#include "bgpd/rfapi/vnc_zebra.h"
+#include "bgpd/rfapi/rfapi_vty.h"
+#include "bgpd/rfapi/rfapi_backend.h"
+#include "bgpd/rfapi/vnc_debug.h"
+
+static struct rfapi_descriptor vncHD1VR; /* Single-VR export dummy nve descr */
+static struct zclient *zclient_vnc = NULL;
+
+/***********************************************************************
+ *	REDISTRIBUTE: Zebra sends updates/withdraws to BGPD
+ ***********************************************************************/
+
+/*
+ * Routes coming from zebra get added to VNC here
+ */
+static void vnc_redistribute_add(struct prefix *p, uint32_t metric,
+				 uint8_t type)
+{
+	struct bgp *bgp = bgp_get_default();
+	struct prefix_rd prd;
+	struct rfapi_ip_addr vnaddr;
+	afi_t afi;
+	uint32_t local_pref =
+		rfp_cost_to_localpref(metric > 255 ? 255 : metric);
+
+	if (!bgp)
+		return;
+
+	if (!bgp->rfapi_cfg) {
+		vnc_zlog_debug_verbose("%s: bgp->rfapi_cfg is NULL, skipping",
+				       __func__);
+		return;
+	}
+
+	afi = family2afi(p->family);
+	if (!afi) {
+		vnc_zlog_debug_verbose("%s: unknown prefix address family %d",
+				       __func__, p->family);
+		return;
+	}
+
+	if (!bgp->rfapi_cfg->redist[afi][type]) {
+		vnc_zlog_debug_verbose(
+			"%s: bgp->rfapi_cfg->redist[afi=%d][type=%d] is 0, skipping",
+			__func__, afi, type);
+		return;
+	}
+	if (!bgp->rfapi_cfg->rfg_redist) {
+		vnc_zlog_debug_verbose("%s: no redist nve group, skipping",
+				       __func__);
+		return;
+	}
+
+	/*
+	 * Assume nve group's configured VN address prefix is a host
+	 * route which also happens to give the NVE VN address to use
+	 * for redistributing into VNC.
+	 */
+	vnaddr.addr_family = bgp->rfapi_cfg->rfg_redist->vn_prefix.family;
+	switch (bgp->rfapi_cfg->rfg_redist->vn_prefix.family) {
+	case AF_INET:
+		if (bgp->rfapi_cfg->rfg_redist->vn_prefix.prefixlen
+		    != IPV4_MAX_BITLEN) {
+			vnc_zlog_debug_verbose(
+				"%s: redist nve group VN prefix len (%d) != 32, skipping",
+				__func__,
+				bgp->rfapi_cfg->rfg_redist->vn_prefix
+					.prefixlen);
+			return;
+		}
+		vnaddr.addr.v4 =
+			bgp->rfapi_cfg->rfg_redist->vn_prefix.u.prefix4;
+		break;
+	case AF_INET6:
+		if (bgp->rfapi_cfg->rfg_redist->vn_prefix.prefixlen
+		    != IPV6_MAX_BITLEN) {
+			vnc_zlog_debug_verbose(
+				"%s: redist nve group VN prefix len (%d) != 128, skipping",
+				__func__,
+				bgp->rfapi_cfg->rfg_redist->vn_prefix
+					.prefixlen);
+			return;
+		}
+		vnaddr.addr.v6 =
+			bgp->rfapi_cfg->rfg_redist->vn_prefix.u.prefix6;
+		break;
+	default:
+		vnc_zlog_debug_verbose(
+			"%s: no redist nve group VN host prefix configured, skipping",
+			__func__);
+		return;
+	}
+
+	/*
+	 * Assume nve group's configured UN address prefix is a host
+	 * route which also happens to give the NVE UN address to use
+	 * for redistributing into VNC.
+	 */
+
+	/*
+	 * Set UN address in dummy nve descriptor so add_vnc_route
+	 * can use it in VNC tunnel SubTLV
+	 */
+	{
+		struct rfapi_ip_prefix pfx_un;
+
+		rfapiQprefix2Rprefix(&bgp->rfapi_cfg->rfg_redist->un_prefix,
+				     &pfx_un);
+
+		switch (pfx_un.prefix.addr_family) {
+		case AF_INET:
+			if (pfx_un.length != IPV4_MAX_BITLEN) {
+				vnc_zlog_debug_verbose(
+					"%s: redist nve group UN prefix len (%d) != 32, skipping",
+					__func__, pfx_un.length);
+				return;
+			}
+			break;
+		case AF_INET6:
+			if (pfx_un.length != IPV6_MAX_BITLEN) {
+				vnc_zlog_debug_verbose(
+					"%s: redist nve group UN prefix len (%d) != 128, skipping",
+					__func__, pfx_un.length);
+				return;
+			}
+			break;
+		default:
+			vnc_zlog_debug_verbose(
+				"%s: no redist nve group UN host prefix configured, skipping",
+				__func__);
+			return;
+		}
+
+		vncHD1VR.un_addr = pfx_un.prefix;
+
+		if (!vncHD1VR.peer) {
+			/*
+			 * Same setup as in rfapi_open()
+			 */
+			vncHD1VR.peer = peer_new(bgp);
+			vncHD1VR.peer->connection->status =
+				Established; /* keep bgp core happy */
+
+			bgp_peer_connection_buffers_free(
+				vncHD1VR.peer->connection);
+
+			/* base code assumes have valid host pointer */
+			vncHD1VR.peer->host =
+				XSTRDUP(MTYPE_BGP_PEER_HOST, ".zebra.");
+
+			/* Mark peer as belonging to HD */
+			SET_FLAG(vncHD1VR.peer->flags, PEER_FLAG_IS_RFAPI_HD);
+		}
+	}
+
+	memset(&prd, 0, sizeof(prd));
+	prd = bgp->rfapi_cfg->rfg_redist->rd;
+	prd.family = AF_UNSPEC;
+	prd.prefixlen = 64;
+
+	add_vnc_route(&vncHD1VR, /* cookie + UN addr */
+		      bgp, SAFI_MPLS_VPN, p, &prd, &vnaddr, &local_pref,
+		      &(bgp->rfapi_cfg->redist_lifetime),
+		      NULL, /* RFP options */
+		      NULL, /* struct rfapi_un_option */
+		      NULL, /* struct rfapi_vn_option */
+		      bgp->rfapi_cfg->rfg_redist->rt_export_list, NULL,
+		      NULL,				/* label: default */
+		      type, BGP_ROUTE_REDISTRIBUTE, 0); /* flags */
+}
+
+/*
+ * Route deletions from zebra propagate to VNC here
+ */
+static void vnc_redistribute_delete(struct prefix *p, uint8_t type)
+{
+	struct bgp *bgp = bgp_get_default();
+	struct prefix_rd prd;
+	afi_t afi;
+
+	if (!bgp)
+		return;
+
+	if (!bgp->rfapi_cfg) {
+		vnc_zlog_debug_verbose("%s: bgp->rfapi_cfg is NULL, skipping",
+				       __func__);
+		return;
+	}
+	afi = family2afi(p->family);
+	if (!afi) {
+		vnc_zlog_debug_verbose("%s: unknown prefix address family %d",
+				       __func__, p->family);
+		return;
+	}
+	if (!bgp->rfapi_cfg->redist[afi][type]) {
+		vnc_zlog_debug_verbose(
+			"%s: bgp->rfapi_cfg->redist[afi=%d][type=%d] is 0, skipping",
+			__func__, afi, type);
+		return;
+	}
+	if (!bgp->rfapi_cfg->rfg_redist) {
+		vnc_zlog_debug_verbose("%s: no redist nve group, skipping",
+				       __func__);
+		return;
+	}
+
+	memset(&prd, 0, sizeof(prd));
+	prd = bgp->rfapi_cfg->rfg_redist->rd;
+	prd.family = AF_UNSPEC;
+	prd.prefixlen = 64;
+
+	del_vnc_route(&vncHD1VR, /* use dummy ptr as cookie */
+		      vncHD1VR.peer, bgp, SAFI_MPLS_VPN, p, &prd, type,
+		      BGP_ROUTE_REDISTRIBUTE, NULL, 0);
+}
+
+/*
+ * Flush all redistributed routes of type <type>
+ */
+static void vnc_redistribute_withdraw(struct bgp *bgp, afi_t afi, uint8_t type)
+{
+	struct prefix_rd prd;
+	struct bgp_table *table;
+	struct bgp_dest *pdest;
+	struct bgp_dest *dest;
+
+	vnc_zlog_debug_verbose("%s: entry", __func__);
+
+	if (!bgp)
+		return;
+	if (!bgp->rfapi_cfg) {
+		vnc_zlog_debug_verbose("%s: bgp->rfapi_cfg is NULL, skipping",
+				       __func__);
+		return;
+	}
+
+	/*
+	 * Loop over all the RDs
+	 */
+	for (pdest = bgp_table_top(bgp->rib[afi][SAFI_MPLS_VPN]); pdest;
+	     pdest = bgp_route_next(pdest)) {
+		const struct prefix *pdest_p = bgp_dest_get_prefix(pdest);
+
+		memset(&prd, 0, sizeof(prd));
+		prd.family = AF_UNSPEC;
+		prd.prefixlen = 64;
+		memcpy(prd.val, pdest_p->u.val, 8);
+
+		/* This is the per-RD table of prefixes */
+		table = bgp_dest_get_bgp_table_info(pdest);
+		if (!table)
+			continue;
+
+		for (dest = bgp_table_top(table); dest;
+		     dest = bgp_route_next(dest)) {
+
+			struct bgp_path_info *ri;
+
+			for (ri = bgp_dest_get_bgp_path_info(dest); ri;
+			     ri = ri->next) {
+				if (ri->type
+				    == type) { /* has matching redist type */
+					break;
+				}
+			}
+			if (ri) {
+				del_vnc_route(
+					&vncHD1VR, /* use dummy ptr as cookie */
+					vncHD1VR.peer, bgp, SAFI_MPLS_VPN,
+					bgp_dest_get_prefix(dest), &prd, type,
+					BGP_ROUTE_REDISTRIBUTE, NULL, 0);
+			}
+		}
+	}
+	vnc_zlog_debug_verbose("%s: return", __func__);
+}
+
+/*
+ * Zebra route add and delete treatment.
+ *
+ * Assumes 1 nexthop
+ */
+static int vnc_zebra_read_route(ZAPI_CALLBACK_ARGS)
+{
+	struct zapi_route api;
+	int add;
+
+	if (zapi_route_decode(zclient->ibuf, &api) < 0)
+		return -1;
+
+	/* we completely ignore srcdest routes for now. */
+	if (CHECK_FLAG(api.message, ZAPI_MESSAGE_SRCPFX))
+		return 0;
+
+	add = (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD);
+	if (add)
+		vnc_redistribute_add(&api.prefix, api.metric, api.type);
+	else
+		vnc_redistribute_delete(&api.prefix, api.type);
+
+	if (BGP_DEBUG(zebra, ZEBRA))
+		vnc_zlog_debug_verbose(
+			"%s: Zebra rcvd: route delete %s %pFX metric %u",
+			__func__, zebra_route_string(api.type), &api.prefix,
+			api.metric);
+
+	return 0;
+}
+
+/***********************************************************************
+ *	vnc_bgp_zebra_*: VNC sends updates/withdraws to Zebra
+ ***********************************************************************/
+
+/*
+ * low-level message builder
+ */
+static void vnc_zebra_route_msg(const struct prefix *p, unsigned int nhp_count,
+				void *nhp_ary, int add) /* 1 = add, 0 = del */
+{
+	struct zapi_route api;
+	struct zapi_nexthop *api_nh;
+	int i;
+	struct in_addr **nhp_ary4 = nhp_ary;
+	struct in6_addr **nhp_ary6 = nhp_ary;
+
+	if (!nhp_count) {
+		vnc_zlog_debug_verbose("%s: empty nexthop list, skipping",
+				       __func__);
+		return;
+	}
+
+	memset(&api, 0, sizeof(api));
+	api.vrf_id = VRF_DEFAULT;
+	api.type = ZEBRA_ROUTE_VNC;
+	api.safi = SAFI_UNICAST;
+	api.prefix = *p;
+
+	/* Nexthops */
+	SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
+	api.nexthop_num = MIN(nhp_count, multipath_num);
+	for (i = 0; i < api.nexthop_num; i++) {
+
+		api_nh = &api.nexthops[i];
+		api_nh->vrf_id = VRF_DEFAULT;
+		switch (p->family) {
+		case AF_INET:
+			memcpy(&api_nh->gate.ipv4, nhp_ary4[i],
+			       sizeof(api_nh->gate.ipv4));
+			api_nh->type = NEXTHOP_TYPE_IPV4;
+			break;
+		case AF_INET6:
+			memcpy(&api_nh->gate.ipv6, nhp_ary6[i],
+			       sizeof(api_nh->gate.ipv6));
+			api_nh->type = NEXTHOP_TYPE_IPV6;
+			break;
+		}
+	}
+
+	if (BGP_DEBUG(zebra, ZEBRA))
+		vnc_zlog_debug_verbose(
+			"%s: Zebra send: route %s %pFX, nhp_count=%d", __func__,
+			(add ? "add" : "del"), &api.prefix, nhp_count);
+
+	zclient_route_send((add ? ZEBRA_ROUTE_ADD : ZEBRA_ROUTE_DELETE),
+			   zclient_vnc, &api);
+}
+
+
+static void
+nve_list_to_nh_array(uint8_t family, struct list *nve_list,
+		     unsigned int *nh_count_ret,
+		     void **nh_ary_ret,  /* returned address array */
+		     void **nhp_ary_ret) /* returned pointer array */
+{
+	int nve_count = listcount(nve_list);
+
+	*nh_count_ret = 0;
+	*nh_ary_ret = NULL;
+	*nhp_ary_ret = NULL;
+
+	if (!nve_count) {
+		vnc_zlog_debug_verbose("%s: empty nve_list, skipping",
+				       __func__);
+		return;
+	}
+
+	if (family == AF_INET) {
+		struct listnode *ln;
+		struct in_addr *iap;
+		struct in_addr **v;
+
+		/*
+		 * Array of nexthop addresses
+		 */
+		*nh_ary_ret =
+			XCALLOC(MTYPE_TMP, nve_count * sizeof(struct in_addr));
+
+		/*
+		 * Array of pointers to nexthop addresses
+		 */
+		*nhp_ary_ret = XCALLOC(MTYPE_TMP,
+				       nve_count * sizeof(struct in_addr *));
+		iap = *nh_ary_ret;
+		v = *nhp_ary_ret;
+
+		for (ln = listhead(nve_list); ln; ln = listnextnode(ln)) {
+
+			struct rfapi_descriptor *irfd;
+			struct prefix nhp;
+
+			irfd = listgetdata(ln);
+
+			if (rfapiRaddr2Qprefix(&irfd->vn_addr, &nhp))
+				continue;
+
+			*iap = nhp.u.prefix4;
+			*v = iap;
+			vnc_zlog_debug_verbose(
+				"%s: ipadr: (%p)<-0x%x, ptr: (%p)<-%p",
+				__func__, iap, nhp.u.prefix4.s_addr, v, iap);
+
+			++iap;
+			++v;
+			++*nh_count_ret;
+		}
+
+	} else if (family == AF_INET6) {
+
+		struct listnode *ln;
+
+		*nh_ary_ret =
+			XCALLOC(MTYPE_TMP, nve_count * sizeof(struct in6_addr));
+
+		*nhp_ary_ret = XCALLOC(MTYPE_TMP,
+				       nve_count * sizeof(struct in6_addr *));
+
+		for (ln = listhead(nve_list); ln; ln = listnextnode(ln)) {
+
+			struct rfapi_descriptor *irfd;
+			struct in6_addr *iap = *nh_ary_ret;
+			struct in6_addr **v = *nhp_ary_ret;
+			struct prefix nhp;
+
+			irfd = listgetdata(ln);
+
+			if (rfapiRaddr2Qprefix(&irfd->vn_addr, &nhp))
+				continue;
+
+			*iap = nhp.u.prefix6;
+			*v = iap;
+
+			++iap;
+			++v;
+			++*nh_count_ret;
+		}
+	}
+}
+
+static void import_table_to_nve_list_zebra(struct bgp *bgp,
+					   struct rfapi_import_table *it,
+					   struct list **nves, uint8_t family)
+{
+	struct listnode *node;
+	struct rfapi_rfg_name *rfgn;
+
+	/*
+	 * Loop over the list of NVE-Groups configured for
+	 * exporting to direct-bgp.
+	 *
+	 * Build a list of NVEs that use this import table
+	 */
+	*nves = NULL;
+	for (ALL_LIST_ELEMENTS_RO(bgp->rfapi_cfg->rfg_export_zebra_l, node,
+				  rfgn)) {
+
+		/*
+		 * If this NVE-Group's import table matches the current one
+		 */
+		if (rfgn->rfg && rfgn->rfg->nves
+		    && rfgn->rfg->rfapi_import_table == it) {
+
+			nve_group_to_nve_list(rfgn->rfg, nves, family);
+		}
+	}
+}
+
+static void vnc_zebra_add_del_prefix(struct bgp *bgp,
+				     struct rfapi_import_table *import_table,
+				     struct agg_node *rn,
+				     int add) /* !0 = add, 0 = del */
+{
+	struct list *nves;
+	const struct prefix *p = agg_node_get_prefix(rn);
+	unsigned int nexthop_count = 0;
+	void *nh_ary = NULL;
+	void *nhp_ary = NULL;
+
+	vnc_zlog_debug_verbose("%s: entry, add=%d", __func__, add);
+
+	if (zclient_vnc->sock < 0)
+		return;
+
+	if (p->family != AF_INET && p->family != AF_INET6) {
+		flog_err(EC_LIB_DEVELOPMENT,
+			 "%s: invalid route node addr family", __func__);
+		return;
+	}
+
+	if (!vrf_bitmap_check(&zclient_vnc->redist[family2afi(p->family)]
+						  [ZEBRA_ROUTE_VNC],
+			      VRF_DEFAULT))
+		return;
+
+	if (!bgp->rfapi_cfg) {
+		vnc_zlog_debug_verbose("%s: bgp->rfapi_cfg is NULL, skipping",
+				       __func__);
+		return;
+	}
+	if (!listcount(bgp->rfapi_cfg->rfg_export_zebra_l)) {
+		vnc_zlog_debug_verbose(
+			"%s: no zebra export nve group, skipping", __func__);
+		return;
+	}
+
+	import_table_to_nve_list_zebra(bgp, import_table, &nves, p->family);
+
+	if (nves) {
+		nve_list_to_nh_array(p->family, nves, &nexthop_count, &nh_ary,
+				     &nhp_ary);
+
+		list_delete(&nves);
+
+		if (nexthop_count)
+			vnc_zebra_route_msg(p, nexthop_count, nhp_ary, add);
+	}
+
+	XFREE(MTYPE_TMP, nhp_ary);
+	XFREE(MTYPE_TMP, nh_ary);
+}
+
+void vnc_zebra_add_prefix(struct bgp *bgp,
+			  struct rfapi_import_table *import_table,
+			  struct agg_node *rn)
+{
+	vnc_zebra_add_del_prefix(bgp, import_table, rn, 1);
+}
+
+void vnc_zebra_del_prefix(struct bgp *bgp,
+			  struct rfapi_import_table *import_table,
+			  struct agg_node *rn)
+{
+	vnc_zebra_add_del_prefix(bgp, import_table, rn, 0);
+}
+
+
+static void vnc_zebra_add_del_nve(struct bgp *bgp, struct rfapi_descriptor *rfd,
+				  int add) /* 0 = del, !0 = add */
+{
+	struct listnode *node;
+	struct rfapi_rfg_name *rfgn;
+	struct rfapi_nve_group_cfg *rfg = rfd->rfg;
+	afi_t afi = family2afi(rfd->vn_addr.addr_family);
+	struct prefix nhp;
+	void *pAddr;
+
+	vnc_zlog_debug_verbose("%s: entry, add=%d", __func__, add);
+
+	if (zclient_vnc->sock < 0)
+		return;
+
+	if (!vrf_bitmap_check(&zclient_vnc->redist[afi][ZEBRA_ROUTE_VNC],
+			      VRF_DEFAULT))
+		return;
+
+	if (afi != AFI_IP && afi != AFI_IP6) {
+		flog_err(EC_LIB_DEVELOPMENT, "%s: invalid vn addr family",
+			 __func__);
+		return;
+	}
+
+	if (!bgp)
+		return;
+	if (!bgp->rfapi_cfg) {
+		vnc_zlog_debug_verbose("%s: bgp->rfapi_cfg is NULL, skipping",
+				       __func__);
+		return;
+	}
+
+	if (rfapiRaddr2Qprefix(&rfd->vn_addr, &nhp)) {
+		vnc_zlog_debug_verbose("%s: can't convert vn address, skipping",
+				       __func__);
+		return;
+	}
+
+	pAddr = &nhp.u.val;
+
+	/*
+	 * Loop over the list of NVE-Groups configured for
+	 * exporting to zebra and see if this new NVE's
+	 * group is among them.
+	 */
+	for (ALL_LIST_ELEMENTS_RO(bgp->rfapi_cfg->rfg_export_zebra_l, node,
+				  rfgn)) {
+
+		/*
+		 * Yes, this NVE's group is configured for export to zebra
+		 */
+		if (rfgn->rfg == rfg) {
+
+			struct agg_table *rt = NULL;
+			struct agg_node *rn;
+			struct rfapi_import_table *import_table;
+			import_table = rfg->rfapi_import_table;
+
+			vnc_zlog_debug_verbose(
+				"%s: this nve's group is in zebra export list",
+				__func__);
+
+			rt = import_table->imported_vpn[afi];
+
+			/*
+			 * Walk the NVE-Group's VNC Import table
+			 */
+			for (rn = agg_route_top(rt); rn;
+			     rn = agg_route_next(rn)) {
+				if (!rn->info)
+					continue;
+
+				vnc_zlog_debug_verbose("%s: sending %s",
+						       __func__,
+						       (add ? "add" : "del"));
+				vnc_zebra_route_msg(agg_node_get_prefix(rn), 1,
+						    &pAddr, add);
+			}
+		}
+	}
+}
+
+void vnc_zebra_add_nve(struct bgp *bgp, struct rfapi_descriptor *rfd)
+{
+	vnc_zebra_add_del_nve(bgp, rfd, 1);
+}
+
+void vnc_zebra_del_nve(struct bgp *bgp, struct rfapi_descriptor *rfd)
+{
+	vnc_zebra_add_del_nve(bgp, rfd, 0);
+}
+
+static void vnc_zebra_add_del_group_afi(struct bgp *bgp,
+					struct rfapi_nve_group_cfg *rfg,
+					afi_t afi, int add)
+{
+	struct agg_table *rt = NULL;
+	struct agg_node *rn;
+	struct rfapi_import_table *import_table;
+	uint8_t family = afi2family(afi);
+
+	struct list *nves = NULL;
+	unsigned int nexthop_count = 0;
+	void *nh_ary = NULL;
+	void *nhp_ary = NULL;
+
+	vnc_zlog_debug_verbose("%s: entry", __func__);
+	import_table = rfg->rfapi_import_table;
+	if (!import_table) {
+		vnc_zlog_debug_verbose(
+			"%s: import table not defined, returning", __func__);
+		return;
+	}
+
+	if (afi == AFI_IP || afi == AFI_IP6) {
+		rt = import_table->imported_vpn[afi];
+	} else {
+		flog_err(EC_LIB_DEVELOPMENT, "%s: bad afi %d", __func__, afi);
+		return;
+	}
+
+	if (!family) {
+		flog_err(EC_LIB_DEVELOPMENT, "%s: computed bad family: %d",
+			 __func__, family);
+		return;
+	}
+
+	if (!rfg->nves) {
+		/* avoid segfault below if list doesn't exist */
+		vnc_zlog_debug_verbose("%s: no NVEs in this group", __func__);
+		return;
+	}
+
+	nve_group_to_nve_list(rfg, &nves, family);
+	if (nves) {
+		vnc_zlog_debug_verbose("%s: have nves", __func__);
+		nve_list_to_nh_array(family, nves, &nexthop_count, &nh_ary,
+				     &nhp_ary);
+
+		vnc_zlog_debug_verbose("%s: family: %d, nve count: %d",
+				       __func__, family, nexthop_count);
+
+		list_delete(&nves);
+
+		if (nexthop_count) {
+			/*
+			 * Walk the NVE-Group's VNC Import table
+			 */
+			for (rn = agg_route_top(rt); rn;
+			     rn = agg_route_next(rn)) {
+				if (rn->info) {
+					vnc_zebra_route_msg(
+						agg_node_get_prefix(rn),
+						nexthop_count, nhp_ary, add);
+				}
+			}
+		}
+		XFREE(MTYPE_TMP, nhp_ary);
+		XFREE(MTYPE_TMP, nh_ary);
+	}
+}
+
+void vnc_zebra_add_group(struct bgp *bgp, struct rfapi_nve_group_cfg *rfg)
+{
+	vnc_zebra_add_del_group_afi(bgp, rfg, AFI_IP, 1);
+	vnc_zebra_add_del_group_afi(bgp, rfg, AFI_IP6, 1);
+}
+
+void vnc_zebra_del_group(struct bgp *bgp, struct rfapi_nve_group_cfg *rfg)
+{
+	vnc_zlog_debug_verbose("%s: entry", __func__);
+	vnc_zebra_add_del_group_afi(bgp, rfg, AFI_IP, 0);
+	vnc_zebra_add_del_group_afi(bgp, rfg, AFI_IP6, 0);
+}
+
+void vnc_zebra_reexport_group_afi(struct bgp *bgp,
+				  struct rfapi_nve_group_cfg *rfg, afi_t afi)
+{
+	struct listnode *node;
+	struct rfapi_rfg_name *rfgn;
+
+	for (ALL_LIST_ELEMENTS_RO(bgp->rfapi_cfg->rfg_export_zebra_l, node,
+				  rfgn)) {
+
+		if (rfgn->rfg == rfg) {
+			vnc_zebra_add_del_group_afi(bgp, rfg, afi, 0);
+			vnc_zebra_add_del_group_afi(bgp, rfg, afi, 1);
+			break;
+		}
+	}
+}
+
+
+/***********************************************************************
+ *			CONTROL INTERFACE
+ ***********************************************************************/
+
+
+/* Other routes redistribution into BGP. */
+int vnc_redistribute_set(struct bgp *bgp, afi_t afi, int type)
+{
+	if (!bgp->rfapi_cfg) {
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+
+	/* Set flag to BGP instance. */
+	bgp->rfapi_cfg->redist[afi][type] = 1;
+
+	//  bgp->redist[afi][type] = 1;
+
+	/* Return if already redistribute flag is set. */
+	if (vrf_bitmap_check(&zclient_vnc->redist[afi][type], VRF_DEFAULT))
+		return CMD_WARNING_CONFIG_FAILED;
+
+	vrf_bitmap_set(&zclient_vnc->redist[afi][type], VRF_DEFAULT);
+
+	// vrf_bitmap_set(&zclient_vnc->redist[afi][type], VRF_DEFAULT);
+
+	/* Return if zebra connection is not established. */
+	if (zclient_vnc->sock < 0)
+		return CMD_WARNING_CONFIG_FAILED;
+
+	if (BGP_DEBUG(zebra, ZEBRA))
+		vnc_zlog_debug_verbose("Zebra send: redistribute add %s",
+				       zebra_route_string(type));
+
+	/* Send distribute add message to zebra. */
+	zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient_vnc, afi, type,
+				0, VRF_DEFAULT);
+
+	return CMD_SUCCESS;
+}
+
+/* Unset redistribution.  */
+int vnc_redistribute_unset(struct bgp *bgp, afi_t afi, int type)
+{
+	vnc_zlog_debug_verbose("%s: type=%d entry", __func__, type);
+
+	if (!bgp->rfapi_cfg) {
+		vnc_zlog_debug_verbose("%s: return (no rfapi_cfg)", __func__);
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+
+	/* Unset flag from BGP instance. */
+	bgp->rfapi_cfg->redist[afi][type] = 0;
+
+	/* Return if zebra connection is disabled. */
+	if (!vrf_bitmap_check(&zclient_vnc->redist[afi][type], VRF_DEFAULT))
+		return CMD_WARNING_CONFIG_FAILED;
+	vrf_bitmap_unset(&zclient_vnc->redist[afi][type], VRF_DEFAULT);
+
+	if (bgp->rfapi_cfg->redist[AFI_IP][type] == 0
+	    && bgp->rfapi_cfg->redist[AFI_IP6][type] == 0
+	    && zclient_vnc->sock >= 0) {
+		/* Send distribute delete message to zebra. */
+		if (BGP_DEBUG(zebra, ZEBRA))
+			vnc_zlog_debug_verbose(
+				"Zebra send: redistribute delete %s",
+				zebra_route_string(type));
+		zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient_vnc,
+					afi, type, 0, VRF_DEFAULT);
+	}
+
+	/* Withdraw redistributed routes from current BGP's routing table. */
+	vnc_redistribute_withdraw(bgp, afi, type);
+
+	vnc_zlog_debug_verbose("%s: return", __func__);
+
+	return CMD_SUCCESS;
+}
+
+extern struct zebra_privs_t bgpd_privs;
+
+static zclient_handler *const vnc_handlers[] = {
+	[ZEBRA_REDISTRIBUTE_ROUTE_ADD] = vnc_zebra_read_route,
+	[ZEBRA_REDISTRIBUTE_ROUTE_DEL] = vnc_zebra_read_route,
+};
+
+/*
+ * Modeled after bgp_zebra.c'bgp_zebra_init()
+ * Charriere asks, "Is it possible to carry two?"
+ */
+void vnc_zebra_init(struct event_loop *master)
+{
+	/* Set default values. */
+	zclient_vnc = zclient_new(master, &zclient_options_default,
+				  vnc_handlers, array_size(vnc_handlers));
+	zclient_init(zclient_vnc, ZEBRA_ROUTE_VNC, 0, &bgpd_privs);
+}
+
+void vnc_zebra_destroy(void)
+{
+	if (zclient_vnc == NULL)
+		return;
+	zclient_stop(zclient_vnc);
+	zclient_free(zclient_vnc);
+	zclient_vnc = NULL;
+}