frr/bgpd/rfapi/rfapi_import.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright 2009-2016, LabN Consulting, L.L.C.
 */

/*
 * File:	rfapi_import.c
 * Purpose:	Handle import of routes from BGP to RFAPI
 */

#include "lib/zebra.h"
#include "lib/prefix.h"
#include "lib/agg_table.h"
#include "lib/vty.h"
#include "lib/memory.h"
#include "lib/log.h"
#include "lib/skiplist.h"
#include "frrevent.h"
#include "lib/stream.h"
#include "lib/lib_errors.h"

#include "bgpd/bgpd.h"
#include "bgpd/bgp_ecommunity.h"
#include "bgpd/bgp_attr.h"
#include "bgpd/bgp_route.h"
#include "bgpd/bgp_mplsvpn.h" /* prefix_rd2str() */
#include "bgpd/bgp_vnc_types.h"
#include "bgpd/bgp_rd.h"

#include "bgpd/rfapi/rfapi.h"
#include "bgpd/rfapi/bgp_rfapi_cfg.h"
#include "bgpd/rfapi/rfapi_backend.h"
#include "bgpd/rfapi/rfapi_import.h"
#include "bgpd/rfapi/rfapi_private.h"
#include "bgpd/rfapi/rfapi_monitor.h"
#include "bgpd/rfapi/rfapi_nve_addr.h"
#include "bgpd/rfapi/rfapi_vty.h"
#include "bgpd/rfapi/vnc_export_bgp.h"
#include "bgpd/rfapi/vnc_export_bgp_p.h"
#include "bgpd/rfapi/vnc_zebra.h"
#include "bgpd/rfapi/vnc_import_bgp.h"
#include "bgpd/rfapi/vnc_import_bgp_p.h"
#include "bgpd/rfapi/rfapi_rib.h"
#include "bgpd/rfapi/rfapi_encap_tlv.h"
#include "bgpd/rfapi/vnc_debug.h"

#undef DEBUG_MONITOR_MOVE_SHORTER
#undef DEBUG_RETURNED_NHL
#undef DEBUG_ROUTE_COUNTERS
#undef DEBUG_ENCAP_MONITOR
#undef DEBUG_L2_EXTRA
#undef DEBUG_IT_NODES
#undef DEBUG_BI_SEARCH

/*
 * Hash to keep track of outstanding timers so we can force them to
 * expire at shutdown time, thus freeing their allocated memory.
 */
PREDECL_HASH(rwcb);

/*
 * Allocated for each withdraw timer instance; freed when the timer
 * expires or is canceled
 */
struct rfapi_withdraw {
	struct rwcb_item rwcbi;

	struct rfapi_import_table *import_table;
	struct agg_node *node;
	struct bgp_path_info *info;
	void (*timer_service_func)(struct event *t); /* for cleanup */
	safi_t safi; /* used only for bulk operations */
	/*
	 * For import table node reference count checking (i.e., debugging).
	 * Normally when a timer expires, lockoffset should be 0. However, if
	 * the timer expiration function is called directly (e.g.,
	 * rfapiExpireVpnNow), the node could be locked by a preceding
	 * agg_route_top() or agg_route_next() in a loop, so we need to pass
	 * this value in.
	 */
	int lockoffset;
};

static int _rwcb_cmp(const struct rfapi_withdraw *w1, const struct rfapi_withdraw *w2)
{
	return (w1 != w2);
}

static uint32_t _rwcb_hash(const struct rfapi_withdraw *w)
{
	return (uintptr_t)w & 0xffffffff;
}

DECLARE_HASH(rwcb, struct rfapi_withdraw, rwcbi, _rwcb_cmp, _rwcb_hash);
static struct rwcb_head _rwcbhash;

/*
 * DEBUG FUNCTION
 * Count remote routes and compare with actively-maintained values.
 * Abort if they disagree.
 */
void rfapiCheckRouteCount(void)
{
	struct bgp *bgp = bgp_get_default();
	struct rfapi *h;
	struct rfapi_import_table *it;
	afi_t afi;

	assert(bgp);

	h = bgp->rfapi;
	assert(h);

	for (it = h->imports; it; it = it->next) {
		for (afi = AFI_IP; afi < AFI_MAX; ++afi) {

			struct agg_table *rt;
			struct agg_node *rn;

			int holddown_count = 0;
			int imported_count = 0;
			int remote_count = 0;

			rt = it->imported_vpn[afi];

			for (rn = agg_route_top(rt); rn;
			     rn = agg_route_next(rn)) {
				struct bgp_path_info *bpi;
				struct bgp_path_info *next;

				for (bpi = rn->info; bpi; bpi = next) {
					next = bpi->next;

					if (CHECK_FLAG(bpi->flags,
						       BGP_PATH_REMOVED)) {
						++holddown_count;

					} else {
						if (!RFAPI_LOCAL_BI(bpi)) {
							if (RFAPI_DIRECT_IMPORT_BI(
								    bpi)) {
								++imported_count;
							} else {
								++remote_count;
							}
						}
					}
				}
			}

			if (it->holddown_count[afi] != holddown_count) {
				vnc_zlog_debug_verbose(
					"%s: it->holddown_count %d != holddown_count %d",
					__func__, it->holddown_count[afi],
					holddown_count);
				assert(0);
			}
			if (it->remote_count[afi] != remote_count) {
				vnc_zlog_debug_verbose(
					"%s: it->remote_count %d != remote_count %d",
					__func__, it->remote_count[afi],
					remote_count);
				assert(0);
			}
			if (it->imported_count[afi] != imported_count) {
				vnc_zlog_debug_verbose(
					"%s: it->imported_count %d != imported_count %d",
					__func__, it->imported_count[afi],
					imported_count);
				assert(0);
			}
		}
	}
}

#ifdef DEBUG_ROUTE_COUNTERS
#define VNC_ITRCCK do {rfapiCheckRouteCount();} while (0)
#else
#define VNC_ITRCCK
#endif

/*
 * Validate reference count for a node in an import table
 *
 * Normally lockoffset is 0 for nodes in quiescent state. However,
 * agg_unlock_node will delete the node if it is called when
 * node->lock == 1, and we have to validate the refcount before
 * the node is deleted. In this case, we specify lockoffset 1.
 */
void rfapiCheckRefcount(struct agg_node *rn, safi_t safi, int lockoffset)
{
	unsigned int count_bpi = 0;
	unsigned int count_monitor = 0;
	struct bgp_path_info *bpi;
	struct rfapi_monitor_encap *hme;
	struct rfapi_monitor_vpn *hmv;

	for (bpi = rn->info; bpi; bpi = bpi->next)
		++count_bpi;


	if (rn->aggregate) {
		++count_monitor; /* rfapi_it_extra */

		switch (safi) {
			void *cursor;
			int rc;

		case SAFI_ENCAP:
			for (hme = RFAPI_MONITOR_ENCAP(rn); hme;
			     hme = hme->next)
				++count_monitor;
			break;

		case SAFI_MPLS_VPN:

			for (hmv = RFAPI_MONITOR_VPN(rn); hmv; hmv = hmv->next)
				++count_monitor;

			if (RFAPI_MONITOR_EXTERIOR(rn)->source) {
				++count_monitor; /* sl */
				cursor = NULL;
				for (rc = skiplist_next(
					     RFAPI_MONITOR_EXTERIOR(rn)->source,
					     NULL, NULL, &cursor);
				     !rc;
				     rc = skiplist_next(
					     RFAPI_MONITOR_EXTERIOR(rn)->source,
					     NULL, NULL, &cursor)) {

					++count_monitor; /* sl entry */
				}
			}
			break;

		case SAFI_UNSPEC:
		case SAFI_UNICAST:
		case SAFI_MULTICAST:
		case SAFI_EVPN:
		case SAFI_LABELED_UNICAST:
		case SAFI_FLOWSPEC:
		case SAFI_MAX:
			assert(!"Passed in safi should be impossible");
		}
	}

	if (count_bpi + count_monitor + lockoffset
	    != agg_node_get_lock_count(rn)) {
		vnc_zlog_debug_verbose(
			"%s: count_bpi=%d, count_monitor=%d, lockoffset=%d, rn->lock=%d",
			__func__, count_bpi, count_monitor, lockoffset,
			agg_node_get_lock_count(rn));
		assert(0);
	}
}

/*
 * Perform deferred rfapi_close operations that were queued
 * during callbacks.
 */
static wq_item_status rfapi_deferred_close_workfunc(struct work_queue *q,
						    void *data)
{
	struct rfapi_descriptor *rfd = data;
	struct rfapi *h = q->spec.data;

	assert(!(h->flags & RFAPI_INCALLBACK));
	rfapi_close(rfd);
	vnc_zlog_debug_verbose("%s: completed deferred close on handle %p",
			       __func__, rfd);
	return WQ_SUCCESS;
}

/*
 * Extract layer 2 option from Encap TLVS in BGP attrs
 */
int rfapiGetL2o(struct attr *attr, struct rfapi_l2address_option *l2o)
{
	if (attr) {
		struct bgp_attr_encap_subtlv *pEncap;

		for (pEncap = bgp_attr_get_vnc_subtlvs(attr); pEncap;
		     pEncap = pEncap->next) {

			if (pEncap->type == BGP_VNC_SUBTLV_TYPE_RFPOPTION) {
				if (pEncap->value[0]
				    == RFAPI_VN_OPTION_TYPE_L2ADDR) {

					if (pEncap->value[1] == 14) {
						memcpy(l2o->macaddr.octet,
						       pEncap->value + 2,
						       ETH_ALEN);
						l2o->label =
							((pEncap->value[10]
							  >> 4)
							 & 0x0f)
							+ ((pEncap->value[9]
							    << 4)
							   & 0xff0)
							+ ((pEncap->value[8]
							    << 12)
							   & 0xff000);

						l2o->local_nve_id =
							pEncap->value[12];

						l2o->logical_net_id =
							(pEncap->value[15]
							 & 0xff)
							+ ((pEncap->value[14]
							    << 8)
							   & 0xff00)
							+ ((pEncap->value[13]
							    << 16)
							   & 0xff0000);
					}

					return 0;
				}
			}
		}
	}

	return ENOENT;
}

/*
 * Extract the lifetime from the Tunnel Encap attribute of a route in
 * an import table
 */
int rfapiGetVncLifetime(struct attr *attr, uint32_t *lifetime)
{
	struct bgp_attr_encap_subtlv *pEncap;

	*lifetime = RFAPI_INFINITE_LIFETIME; /* default to infinite */

	if (attr) {

		for (pEncap = bgp_attr_get_vnc_subtlvs(attr); pEncap;
		     pEncap = pEncap->next) {

			if (pEncap->type
			    == BGP_VNC_SUBTLV_TYPE_LIFETIME) { /* lifetime */
				if (pEncap->length == 4) {
					memcpy(lifetime, pEncap->value, 4);
					*lifetime = ntohl(*lifetime);
					return 0;
				}
			}
		}
	}

	return ENOENT;
}

/*
 * Look for UN address in Encap attribute
 */
int rfapiGetVncTunnelUnAddr(struct attr *attr, struct prefix *p)
{
	struct bgp_attr_encap_subtlv *pEncap;
	bgp_encap_types tun_type = BGP_ENCAP_TYPE_MPLS;/*Default tunnel type*/

	bgp_attr_extcom_tunnel_type(attr, &tun_type);
	if (tun_type == BGP_ENCAP_TYPE_MPLS) {
		if (!p)
			return 0;
		/* MPLS carries UN address in next hop */
		rfapiNexthop2Prefix(attr, p);
		if (p->family != AF_UNSPEC)
			return 0;

		return ENOENT;
	}
	if (attr) {
		for (pEncap = attr->encap_subtlvs; pEncap;
		     pEncap = pEncap->next) {

			if (pEncap->type
			    == BGP_ENCAP_SUBTLV_TYPE_REMOTE_ENDPOINT) { /* un
									   addr
									   */
				switch (pEncap->length) {
				case 8:
					if (p) {
						p->family = AF_INET;
						p->prefixlen = IPV4_MAX_BITLEN;
						memcpy(p->u.val, pEncap->value,
						       4);
					}
					return 0;

				case 20:
					if (p) {
						p->family = AF_INET6;
						p->prefixlen = IPV6_MAX_BITLEN;
						memcpy(p->u.val, pEncap->value,
						       16);
					}
					return 0;
				}
			}
		}
	}

	return ENOENT;
}

/*
 * Get UN address wherever it might be
 */
int rfapiGetUnAddrOfVpnBi(struct bgp_path_info *bpi, struct prefix *p)
{
	/* If it's in this route's VNC attribute, we're done */
	if (!rfapiGetVncTunnelUnAddr(bpi->attr, p))
		return 0;
	/*
	 * Otherwise, see if it's cached from a corresponding ENCAP SAFI
	 * advertisement
	 */
	if (bpi->extra) {
		switch (bpi->extra->vnc->vnc.import.un_family) {
		case AF_INET:
			if (p) {
				p->family =
					bpi->extra->vnc->vnc.import.un_family;
				p->u.prefix4 =
					bpi->extra->vnc->vnc.import.un.addr4;
				p->prefixlen = IPV4_MAX_BITLEN;
			}
			return 0;
		case AF_INET6:
			if (p) {
				p->family =
					bpi->extra->vnc->vnc.import.un_family;
				p->u.prefix6 =
					bpi->extra->vnc->vnc.import.un.addr6;
				p->prefixlen = IPV6_MAX_BITLEN;
			}
			return 0;
		default:
			if (p)
				p->family = AF_UNSPEC;
#ifdef DEBUG_ENCAP_MONITOR
			vnc_zlog_debug_verbose(
				"%s: bpi->extra->vnc.import.un_family is 0, no UN addr",
				__func__);
#endif
			break;
		}
	}

	return ENOENT;
}


/*
 * Make a new bgp_path_info from gathered parameters
 */
static struct bgp_path_info *rfapiBgpInfoCreate(struct attr *attr,
						struct peer *peer, void *rfd,
						struct prefix_rd *prd,
						uint8_t type, uint8_t sub_type,
						uint32_t *label)
{
	struct bgp_path_info *new;
	struct bgp_labels bgp_labels = {};

	new = info_make(type, sub_type, 0, peer, attr, NULL);

	new->attr = bgp_attr_intern(attr);

	bgp_path_info_extra_get(new);
	new->extra->vnc = XCALLOC(MTYPE_BGP_ROUTE_EXTRA_VNC,
				  sizeof(struct bgp_path_info_extra_vnc));
	if (prd) {
		new->extra->vnc->vnc.import.rd = *prd;
		new->extra->vnc->vnc.import.create_time = monotime(NULL);
	}
	if (label && *label != MPLS_INVALID_LABEL) {
		encode_label(*label, &bgp_labels.label[0]);
		bgp_labels.num_labels = 1;
		new->extra->labels = bgp_labels_intern(&bgp_labels);
	}

	peer_lock(peer);

	return new;
}

/*
 * Frees bgp_path_info as used in import tables (parts are not
 * allocated exactly the way they are in the main RIBs)
 */
static void rfapiBgpInfoFree(struct bgp_path_info *goner)
{
	if (!goner)
		return;

	if (goner->peer) {
		vnc_zlog_debug_verbose("%s: calling peer_unlock(%p), #%d",
				       __func__, goner->peer,
				       goner->peer->lock);
		peer_unlock(goner->peer);
	}

	bgp_attr_unintern(&goner->attr);

	if (goner->extra)
		bgp_path_info_extra_free(&goner->extra);
	XFREE(MTYPE_BGP_ROUTE, goner);
}

struct rfapi_import_table *rfapiMacImportTableGetNoAlloc(struct bgp *bgp,
							 uint32_t lni)
{
	struct rfapi *h;
	struct rfapi_import_table *it = NULL;
	uintptr_t lni_as_ptr = lni;

	h = bgp->rfapi;
	if (!h)
		return NULL;

	if (!h->import_mac)
		return NULL;

	if (skiplist_search(h->import_mac, (void *)lni_as_ptr, (void **)&it))
		return NULL;

	return it;
}

struct rfapi_import_table *rfapiMacImportTableGet(struct bgp *bgp, uint32_t lni)
{
	struct rfapi *h;
	struct rfapi_import_table *it = NULL;
	uintptr_t lni_as_ptr = lni;

	h = bgp->rfapi;
	assert(h);

	if (!h->import_mac) {
		/* default cmp is good enough for LNI */
		h->import_mac = skiplist_new(0, NULL, NULL);
	}

	if (skiplist_search(h->import_mac, (void *)lni_as_ptr, (void **)&it)) {

		struct ecommunity *enew;
		struct ecommunity_val eval;
		afi_t afi;

		it = XCALLOC(MTYPE_RFAPI_IMPORTTABLE,
			     sizeof(struct rfapi_import_table));
		/* set RT list of new import table based on LNI */
		memset((char *)&eval, 0, sizeof(eval));
		eval.val[0] = 0; /* VNC L2VPN */
		eval.val[1] = 2; /* VNC L2VPN */
		eval.val[5] = (lni >> 16) & 0xff;
		eval.val[6] = (lni >> 8) & 0xff;
		eval.val[7] = (lni >> 0) & 0xff;

		enew = ecommunity_new();
		ecommunity_add_val(enew, &eval, false, false);
		it->rt_import_list = enew;

		for (afi = AFI_IP; afi < AFI_MAX; ++afi) {
			it->imported_vpn[afi] = agg_table_init();
			it->imported_encap[afi] = agg_table_init();
		}

		it->l2_logical_net_id = lni;

		skiplist_insert(h->import_mac, (void *)lni_as_ptr, it);
	}

	assert(it);
	return it;
}

/*
 * Implement MONITOR_MOVE_SHORTER(original_node) from
 * RFAPI-Import-Event-Handling.txt
 *
 * Returns pointer to the list of moved monitors
 */
static struct rfapi_monitor_vpn *
rfapiMonitorMoveShorter(struct agg_node *original_vpn_node, int lockoffset)
{
	struct bgp_path_info *bpi;
	struct agg_node *par;
	struct rfapi_monitor_vpn *m;
	struct rfapi_monitor_vpn *mlast;
	struct rfapi_monitor_vpn *moved;
	int movecount = 0;
	int parent_already_refcounted = 0;

	RFAPI_CHECK_REFCOUNT(original_vpn_node, SAFI_MPLS_VPN, lockoffset);

#ifdef DEBUG_MONITOR_MOVE_SHORTER
	{
		vnc_zlog_debug_verbose("%s: called with node pfx=%pFX",
				       __func__, &original_vpn_node->p);
	}
#endif

	/*
	 * 1. If there is at least one bpi (either regular route or
	 *    route marked as withdrawn, with a pending timer) at
	 *    original_node with a valid UN address, we're done. Return.
	 */
	for (bpi = original_vpn_node->info; bpi; bpi = bpi->next) {
		struct prefix pfx;

		if (!rfapiGetUnAddrOfVpnBi(bpi, &pfx)) {
#ifdef DEBUG_MONITOR_MOVE_SHORTER
			vnc_zlog_debug_verbose(
				"%s: have valid UN at original node, no change",
				__func__);
#endif
			return NULL;
		}
	}

	/*
	 * 2. Travel up the tree (toward less-specific prefixes) from
	 *    original_node to find the first node that has at least
	 *    one route (even if it is only a withdrawn route) with a
	 *    valid UN address. Call this node "Node P."
	 */
	for (par = agg_node_parent(original_vpn_node); par;
	     par = agg_node_parent(par)) {
		for (bpi = par->info; bpi; bpi = bpi->next) {
			struct prefix pfx;
			if (!rfapiGetUnAddrOfVpnBi(bpi, &pfx)) {
				break;
			}
		}
		if (bpi)
			break;
	}

	if (par) {
		RFAPI_CHECK_REFCOUNT(par, SAFI_MPLS_VPN, 0);
	}

	/*
	 * If no less-specific routes, try to use the 0/0 node
	 */
	if (!par) {
		const struct prefix *p;
		/* this isn't necessarily 0/0 */
		par = agg_route_table_top(original_vpn_node);

		if (par)
			p = agg_node_get_prefix(par);
		/*
		 * If we got the top node but it wasn't 0/0,
		 * ignore it
		 */
		if (par && p->prefixlen) {
			agg_unlock_node(par); /* maybe free */
			par = NULL;
		}

		if (par) {
			++parent_already_refcounted;
		}
	}

	/*
	 * Create 0/0 node if it isn't there
	 */
	if (!par) {
		struct prefix pfx_default;
		const struct prefix *p = agg_node_get_prefix(original_vpn_node);

		memset(&pfx_default, 0, sizeof(pfx_default));
		pfx_default.family = p->family;

		/* creates default node if none exists */
		par = agg_node_get(agg_get_table(original_vpn_node),
				   &pfx_default);
		++parent_already_refcounted;
	}

	/*
	 * 3. Move each of the monitors found at original_node to Node P.
	 *    These are "Moved Monitors."
	 *
	 */

	/*
	 * Attach at end so that the list pointer we return points
	 * only to the moved routes
	 */
	for (m = RFAPI_MONITOR_VPN(par), mlast = NULL; m;
	     mlast = m, m = m->next)
		;

	if (mlast) {
		moved = mlast->next = RFAPI_MONITOR_VPN(original_vpn_node);
	} else {
		moved = RFAPI_MONITOR_VPN_W_ALLOC(par) =
			RFAPI_MONITOR_VPN(original_vpn_node);
	}
	if (RFAPI_MONITOR_VPN(
		    original_vpn_node)) /* check agg, so not allocated */
		RFAPI_MONITOR_VPN_W_ALLOC(original_vpn_node) = NULL;

	/*
	 * update the node pointers on the monitors
	 */
	for (m = moved; m; m = m->next) {
		++movecount;
		m->node = par;
	}

	RFAPI_CHECK_REFCOUNT(par, SAFI_MPLS_VPN,
			     parent_already_refcounted - movecount);
	while (movecount > parent_already_refcounted) {
		agg_lock_node(par);
		++parent_already_refcounted;
	}
	while (movecount < parent_already_refcounted) {
		/* unlikely, but code defensively */
		agg_unlock_node(par);
		--parent_already_refcounted;
	}
	RFAPI_CHECK_REFCOUNT(original_vpn_node, SAFI_MPLS_VPN,
			     movecount + lockoffset);
	while (movecount--) {
		agg_unlock_node(original_vpn_node);
	}

#ifdef DEBUG_MONITOR_MOVE_SHORTER
	{
		vnc_zlog_debug_verbose("%s: moved to node pfx=%pFX", __func__,
				       &par->p);
	}
#endif


	return moved;
}

/*
 * Implement MONITOR_MOVE_LONGER(new_node) from
 * RFAPI-Import-Event-Handling.txt
 */
static void rfapiMonitorMoveLonger(struct agg_node *new_vpn_node)
{
	struct rfapi_monitor_vpn *monitor;
	struct rfapi_monitor_vpn *mlast;
	struct bgp_path_info *bpi;
	struct agg_node *par;
	const struct prefix *new_vpn_node_p = agg_node_get_prefix(new_vpn_node);

	RFAPI_CHECK_REFCOUNT(new_vpn_node, SAFI_MPLS_VPN, 0);

	/*
	 * Make sure we have at least one valid route at the new node
	 */
	for (bpi = new_vpn_node->info; bpi; bpi = bpi->next) {
		struct prefix pfx;
		if (!rfapiGetUnAddrOfVpnBi(bpi, &pfx))
			break;
	}

	if (!bpi) {
		vnc_zlog_debug_verbose(
			"%s: no valid routes at node %p, so not attempting moves",
			__func__, new_vpn_node);
		return;
	}

	/*
	 * Find first parent node that has monitors
	 */
	for (par = agg_node_parent(new_vpn_node); par;
	     par = agg_node_parent(par)) {
		if (RFAPI_MONITOR_VPN(par))
			break;
	}

	if (!par) {
		vnc_zlog_debug_verbose(
			"%s: no parent nodes with monitors, done", __func__);
		return;
	}

	/*
	 * Check each of these monitors to see of their longest-match
	 * is now the updated node. Move any such monitors to the more-
	 * specific updated node
	 */
	for (mlast = NULL, monitor = RFAPI_MONITOR_VPN(par); monitor;) {
		/*
		 * If new longest match for monitor prefix is the new
		 * route's prefix, move monitor to new route's prefix
		 */
		if (prefix_match(new_vpn_node_p, &monitor->p)) {
			/* detach */
			if (mlast) {
				mlast->next = monitor->next;
			} else {
				RFAPI_MONITOR_VPN_W_ALLOC(par) = monitor->next;
			}


			/* attach */
			monitor->next = RFAPI_MONITOR_VPN(new_vpn_node);
			RFAPI_MONITOR_VPN_W_ALLOC(new_vpn_node) = monitor;
			monitor->node = new_vpn_node;

			agg_lock_node(new_vpn_node); /* incr refcount */

			monitor = mlast ? mlast->next : RFAPI_MONITOR_VPN(par);

			RFAPI_CHECK_REFCOUNT(par, SAFI_MPLS_VPN, 1);
			/* decr refcount after we're done with par as this might
			 * free it */
			agg_unlock_node(par);

			continue;
		}
		mlast = monitor;
		monitor = monitor->next;
	}

	RFAPI_CHECK_REFCOUNT(new_vpn_node, SAFI_MPLS_VPN, 0);
}


static void rfapiBgpInfoChainFree(struct bgp_path_info *bpi)
{
	struct bgp_path_info *next;

	while (bpi) {

		/*
		 * If there is a timer waiting to delete this bpi, cancel
		 * the timer and delete immediately
		 */
		if (CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED) &&
		    bpi->extra->vnc->vnc.import.timer) {
			struct rfapi_withdraw *wcb =
				EVENT_ARG(bpi->extra->vnc->vnc.import.timer);

			rwcb_del(&_rwcbhash, wcb);
			XFREE(MTYPE_RFAPI_WITHDRAW, wcb);
			EVENT_OFF(bpi->extra->vnc->vnc.import.timer);
		}

		next = bpi->next;
		bpi->next = NULL;
		rfapiBgpInfoFree(bpi);
		bpi = next;
	}
}

static void rfapiImportTableFlush(struct rfapi_import_table *it)
{
	afi_t afi;

	/*
	 * Free ecommunity
	 */
	ecommunity_free(&it->rt_import_list);
	it->rt_import_list = NULL;

	for (afi = AFI_IP; afi < AFI_MAX; ++afi) {

		struct agg_node *rn;
		struct agg_table *at;

		at = it->imported_vpn[afi];
		if (at) {
			for (rn = agg_route_top(at); rn;
			     rn = agg_route_next(rn)) {
				/*
				 * Each route_node has:
				 * aggregate: points to rfapi_it_extra with
				 *     monitor chain(s)
				 * info: points to chain of bgp_path_info
				 */
				/* free bgp_path_info and its children */
				rfapiBgpInfoChainFree(rn->info);
				rn->info = NULL;

				rfapiMonitorExtraFlush(SAFI_MPLS_VPN, rn);
			}
			agg_table_finish(at);
		}

		if (at) {
			at = it->imported_encap[afi];
			for (rn = agg_route_top(at); rn;
			     rn = agg_route_next(rn)) {
				/* free bgp_path_info and its children */
				rfapiBgpInfoChainFree(rn->info);
				rn->info = NULL;

				rfapiMonitorExtraFlush(SAFI_ENCAP, rn);
			}
			agg_table_finish(at);
		}
	}
	if (it->monitor_exterior_orphans) {
		skiplist_free(it->monitor_exterior_orphans);
	}
}

void rfapiImportTableRefDelByIt(struct bgp *bgp,
				struct rfapi_import_table *it_target)
{
	struct rfapi *h;
	struct rfapi_import_table *it;
	struct rfapi_import_table *prev = NULL;

	assert(it_target);

	h = bgp->rfapi;
	assert(h);

	for (it = h->imports; it; prev = it, it = it->next) {
		if (it == it_target)
			break;
	}

	assert(it);
	assert(it->refcount);

	it->refcount -= 1;

	if (!it->refcount) {
		if (prev) {
			prev->next = it->next;
		} else {
			h->imports = it->next;
		}
		rfapiImportTableFlush(it);
		XFREE(MTYPE_RFAPI_IMPORTTABLE, it);
	}
}

#ifdef RFAPI_REQUIRE_ENCAP_BEEC
/*
 * Look for magic BGP Encapsulation Extended Community value
 * Format in RFC 5512 Sect. 4.5
 */
static int rfapiEcommunitiesMatchBeec(struct ecommunity *ecom,
				      bgp_encap_types type)
{
	int i;

	if (!ecom)
		return 0;

	for (i = 0; i < (ecom->size * ECOMMUNITY_SIZE); i += ECOMMUNITY_SIZE) {

		uint8_t *ep;

		ep = ecom->val + i;

		if (ep[0] == ECOMMUNITY_ENCODE_OPAQUE
		    && ep[1] == ECOMMUNITY_OPAQUE_SUBTYPE_ENCAP
		    && ep[6] == ((type && 0xff00) >> 8)
		    && ep[7] == (type & 0xff)) {

			return 1;
		}
	}
	return 0;
}
#endif

int rfapiEcommunitiesIntersect(struct ecommunity *e1, struct ecommunity *e2)
{
	uint32_t i, j;

	if (!e1 || !e2)
		return 0;

	{
		char *s1, *s2;
		s1 = ecommunity_ecom2str(e1, ECOMMUNITY_FORMAT_DISPLAY, 0);
		s2 = ecommunity_ecom2str(e2, ECOMMUNITY_FORMAT_DISPLAY, 0);
		vnc_zlog_debug_verbose("%s: e1[%s], e2[%s]", __func__, s1, s2);
		XFREE(MTYPE_ECOMMUNITY_STR, s1);
		XFREE(MTYPE_ECOMMUNITY_STR, s2);
	}

	for (i = 0; i < e1->size; ++i) {
		for (j = 0; j < e2->size; ++j) {
			if (!memcmp(e1->val + (i * ECOMMUNITY_SIZE),
				    e2->val + (j * ECOMMUNITY_SIZE),
				    ECOMMUNITY_SIZE)) {

				return 1;
			}
		}
	}
	return 0;
}

int rfapiEcommunityGetLNI(struct ecommunity *ecom, uint32_t *lni)
{
	if (ecom) {
		uint32_t i;

		for (i = 0; i < ecom->size; ++i) {
			uint8_t *p = ecom->val + (i * ECOMMUNITY_SIZE);

			if ((*(p + 0) == 0x00) && (*(p + 1) == 0x02)) {

				*lni = (*(p + 5) << 16) | (*(p + 6) << 8)
				       | (*(p + 7));
				return 0;
			}
		}
	}
	return ENOENT;
}

int rfapiEcommunityGetEthernetTag(struct ecommunity *ecom, uint16_t *tag_id)
{
	struct bgp *bgp = bgp_get_default();
	*tag_id = 0; /* default to untagged */
	if (ecom) {
		uint32_t i;

		for (i = 0; i < ecom->size; ++i) {
			as_t as = 0;
			int encode = 0;
			const uint8_t *p = ecom->val + (i * ECOMMUNITY_SIZE);

			/* High-order octet of type. */
			encode = *p++;

			if (*p++ == ECOMMUNITY_ROUTE_TARGET) {
				if (encode == ECOMMUNITY_ENCODE_AS4) {
					p = ptr_get_be32(p, &as);
				} else if (encode == ECOMMUNITY_ENCODE_AS) {
					as = (*p++ << 8);
					as |= (*p++);
					p += 2; /* skip next two, tag/vid
						   always in lowest bytes */
				}
				if (as == bgp->as) {
					*tag_id = *p++ << 8;
					*tag_id |= (*p++);
					return 0;
				}
			}
		}
	}
	return ENOENT;
}

static int rfapiVpnBiNhEqualsPt(struct bgp_path_info *bpi,
				struct rfapi_ip_addr *hpt)
{
	uint8_t family;

	if (!hpt || !bpi)
		return 0;

	family = BGP_MP_NEXTHOP_FAMILY(bpi->attr->mp_nexthop_len);

	if (hpt->addr_family != family)
		return 0;

	switch (family) {
	case AF_INET:
		if (bpi->attr->mp_nexthop_global_in.s_addr
		    != hpt->addr.v4.s_addr)
			return 0;
		break;

	case AF_INET6:
		if (IPV6_ADDR_CMP(&bpi->attr->mp_nexthop_global, &hpt->addr.v6))
			return 0;
		break;

	default:
		return 0;
	}

	return 1;
}


/*
 * Compare 2 VPN BIs. Return true if they have the same VN and UN addresses
 */
static int rfapiVpnBiSamePtUn(struct bgp_path_info *bpi1,
			      struct bgp_path_info *bpi2)
{
	struct prefix pfx_un1;
	struct prefix pfx_un2;

	if (!bpi1 || !bpi2)
		return 0;

	/*
	 * VN address comparisons
	 */

	if (BGP_MP_NEXTHOP_FAMILY(bpi1->attr->mp_nexthop_len)
	    != BGP_MP_NEXTHOP_FAMILY(bpi2->attr->mp_nexthop_len)) {
		return 0;
	}

	switch (BGP_MP_NEXTHOP_FAMILY(bpi1->attr->mp_nexthop_len)) {
	case AF_INET:
		if (bpi1->attr->mp_nexthop_global_in.s_addr
		    != bpi2->attr->mp_nexthop_global_in.s_addr)
			return 0;
		break;

	case AF_INET6:
		if (IPV6_ADDR_CMP(&bpi1->attr->mp_nexthop_global,
				  &bpi2->attr->mp_nexthop_global))
			return 0;
		break;

	default:
		return 0;
	}

	memset(&pfx_un1, 0, sizeof(pfx_un1));
	memset(&pfx_un2, 0, sizeof(pfx_un2));

	/*
	 * UN address comparisons
	 */
	if (rfapiGetVncTunnelUnAddr(bpi1->attr, &pfx_un1)) {
		if (bpi1->extra) {
			pfx_un1.family = bpi1->extra->vnc->vnc.import.un_family;
			switch (bpi1->extra->vnc->vnc.import.un_family) {
			case AF_INET:
				pfx_un1.u.prefix4 =
					bpi1->extra->vnc->vnc.import.un.addr4;
				break;
			case AF_INET6:
				pfx_un1.u.prefix6 =
					bpi1->extra->vnc->vnc.import.un.addr6;
				break;
			default:
				pfx_un1.family = AF_UNSPEC;
				break;
			}
		}
	}

	if (rfapiGetVncTunnelUnAddr(bpi2->attr, &pfx_un2)) {
		if (bpi2->extra) {
			pfx_un2.family = bpi2->extra->vnc->vnc.import.un_family;
			switch (bpi2->extra->vnc->vnc.import.un_family) {
			case AF_INET:
				pfx_un2.u.prefix4 =
					bpi2->extra->vnc->vnc.import.un.addr4;
				break;
			case AF_INET6:
				pfx_un2.u.prefix6 =
					bpi2->extra->vnc->vnc.import.un.addr6;
				break;
			default:
				pfx_un2.family = AF_UNSPEC;
				break;
			}
		}
	}

	if (pfx_un1.family == AF_UNSPEC || pfx_un2.family == AF_UNSPEC)
		return 0;

	if (pfx_un1.family != pfx_un2.family)
		return 0;

	switch (pfx_un1.family) {
	case AF_INET:
		if (!IPV4_ADDR_SAME(&pfx_un1.u.prefix4, &pfx_un2.u.prefix4))
			return 0;
		break;
	case AF_INET6:
		if (!IPV6_ADDR_SAME(&pfx_un1.u.prefix6, &pfx_un2.u.prefix6))
			return 0;
		break;
	}


	return 1;
}

uint8_t rfapiRfpCost(struct attr *attr)
{
	if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_LOCAL_PREF)) {
		if (attr->local_pref > 255) {
			return 0;
		}
		return 255 - attr->local_pref;
	}

	return 255;
}

/*------------------------------------------
 * rfapi_extract_l2o
 *
 * Find Layer 2 options in an option chain
 *
 * input:
 *	pHop		option chain
 *
 * output:
 *	l2o		layer 2 options extracted
 *
 * return value:
 *	0		OK
 *	1		no options found
 *
 --------------------------------------------*/
int rfapi_extract_l2o(
	struct bgp_tea_options *pHop,       /* chain of options */
	struct rfapi_l2address_option *l2o) /* return extracted value */
{
	struct bgp_tea_options *p;

	for (p = pHop; p; p = p->next) {
		if ((p->type == RFAPI_VN_OPTION_TYPE_L2ADDR)
		    && (p->length >= 8)) {

			char *v = p->value;

			memcpy(&l2o->macaddr, v, 6);

			l2o->label = ((v[6] << 12) & 0xff000)
				     + ((v[7] << 4) & 0xff0)
				     + ((v[8] >> 4) & 0xf);

			l2o->local_nve_id = (uint8_t)v[10];

			l2o->logical_net_id =
				(v[11] << 16) + (v[12] << 8) + (v[13] << 0);

			return 0;
		}
	}
	return 1;
}

static struct rfapi_next_hop_entry *
rfapiRouteInfo2NextHopEntry(struct rfapi_ip_prefix *rprefix,
			    struct bgp_path_info *bpi, /* route to encode */
			    uint32_t lifetime,	 /* use this in nhe */
			    struct agg_node *rn)       /* req for L2 eth addr */
{
	struct rfapi_next_hop_entry *new;
	int have_vnc_tunnel_un = 0;
	const struct prefix *p = agg_node_get_prefix(rn);

#ifdef DEBUG_ENCAP_MONITOR
	vnc_zlog_debug_verbose("%s: entry, bpi %p, rn %p", __func__, bpi, rn);
#endif

	new = XCALLOC(MTYPE_RFAPI_NEXTHOP, sizeof(struct rfapi_next_hop_entry));

	new->prefix = *rprefix;

	if (bpi->extra && decode_rd_type(bpi->extra->vnc->vnc.import.rd.val) ==
				  RD_TYPE_VNC_ETH) {
		/* ethernet */

		struct rfapi_vn_option *vo;

		vo = XCALLOC(MTYPE_RFAPI_VN_OPTION,
			     sizeof(struct rfapi_vn_option));

		vo->type = RFAPI_VN_OPTION_TYPE_L2ADDR;

		memcpy(&vo->v.l2addr.macaddr, &p->u.prefix_eth.octet, ETH_ALEN);
		/* only low 3 bytes of this are significant */
		(void)rfapiEcommunityGetLNI(bgp_attr_get_ecommunity(bpi->attr),
					    &vo->v.l2addr.logical_net_id);
		(void)rfapiEcommunityGetEthernetTag(
			bgp_attr_get_ecommunity(bpi->attr),
			&vo->v.l2addr.tag_id);

		/* local_nve_id comes from lower byte of RD type */
		vo->v.l2addr.local_nve_id =
			bpi->extra->vnc->vnc.import.rd.val[1];

		/* label comes from MP_REACH_NLRI label */
		vo->v.l2addr.label =
			BGP_PATH_INFO_NUM_LABELS(bpi)
				? decode_label(&bpi->extra->labels->label[0])
				: MPLS_INVALID_LABEL;

		new->vn_options = vo;

		/*
		 * If there is an auxiliary prefix (i.e., host IP address),
		 * use it as the nexthop prefix instead of the query prefix
		 */
		if (bpi->extra->vnc->vnc.import.aux_prefix.family) {
			rfapiQprefix2Rprefix(&bpi->extra->vnc->vnc.import
						      .aux_prefix,
					     &new->prefix);
		}
	}

	bgp_encap_types tun_type = BGP_ENCAP_TYPE_MPLS; /*Default*/
	new->prefix.cost = rfapiRfpCost(bpi->attr);

	struct bgp_attr_encap_subtlv *pEncap;

	switch (BGP_MP_NEXTHOP_FAMILY(bpi->attr->mp_nexthop_len)) {
	case AF_INET:
		new->vn_address.addr_family = AF_INET;
		new->vn_address.addr.v4 = bpi->attr->mp_nexthop_global_in;
		break;

	case AF_INET6:
		new->vn_address.addr_family = AF_INET6;
		new->vn_address.addr.v6 = bpi->attr->mp_nexthop_global;
		break;

	default:
		zlog_warn("%s: invalid vpn nexthop length: %d", __func__,
			  bpi->attr->mp_nexthop_len);
		rfapi_free_next_hop_list(new);
		return NULL;
	}

	for (pEncap = bgp_attr_get_vnc_subtlvs(bpi->attr); pEncap;
	     pEncap = pEncap->next) {
		switch (pEncap->type) {
		case BGP_VNC_SUBTLV_TYPE_LIFETIME:
			/* use configured lifetime, not attr lifetime */
			break;

		default:
			zlog_warn("%s: unknown VNC option type %d", __func__,
				  pEncap->type);

			break;
		}
	}

	bgp_attr_extcom_tunnel_type(bpi->attr, &tun_type);
	if (tun_type == BGP_ENCAP_TYPE_MPLS) {
		struct prefix pfx;
		/* MPLS carries UN address in next hop */
		rfapiNexthop2Prefix(bpi->attr, &pfx);
		if (pfx.family != AF_UNSPEC) {
			rfapiQprefix2Raddr(&pfx, &new->un_address);
			have_vnc_tunnel_un = 1;
		}
	}

	for (pEncap = bpi->attr->encap_subtlvs; pEncap; pEncap = pEncap->next) {
		switch (pEncap->type) {
		case BGP_ENCAP_SUBTLV_TYPE_REMOTE_ENDPOINT:
			/*
			 * Overrides ENCAP UN address, if any
			 */
			switch (pEncap->length) {

			case 8:
				new->un_address.addr_family = AF_INET;
				memcpy(&new->un_address.addr.v4, pEncap->value,
				       4);
				have_vnc_tunnel_un = 1;
				break;

			case 20:
				new->un_address.addr_family = AF_INET6;
				memcpy(&new->un_address.addr.v6, pEncap->value,
				       16);
				have_vnc_tunnel_un = 1;
				break;

			default:
				zlog_warn(
					"%s: invalid tunnel subtlv UN addr length (%d) for bpi %p",
					__func__, pEncap->length, bpi);
			}
			break;

		default:
			zlog_warn("%s: unknown Encap Attribute option type %d",
				  __func__, pEncap->type);
			break;
		}
	}

	new->un_options = rfapi_encap_tlv_to_un_option(bpi->attr);

#ifdef DEBUG_ENCAP_MONITOR
	vnc_zlog_debug_verbose("%s: line %d: have_vnc_tunnel_un=%d", __func__,
			       __LINE__, have_vnc_tunnel_un);
#endif

	if (!have_vnc_tunnel_un && bpi->extra) {
		/*
		 * use cached UN address from ENCAP route
		 */
		new->un_address.addr_family =
			bpi->extra->vnc->vnc.import.un_family;
		switch (new->un_address.addr_family) {
		case AF_INET:
			new->un_address.addr.v4 =
				bpi->extra->vnc->vnc.import.un.addr4;
			break;
		case AF_INET6:
			new->un_address.addr.v6 =
				bpi->extra->vnc->vnc.import.un.addr6;
			break;
		default:
			zlog_warn("%s: invalid UN addr family (%d) for bpi %p",
				  __func__, new->un_address.addr_family, bpi);
			rfapi_free_next_hop_list(new);
			return NULL;
		}
	}

	new->lifetime = lifetime;
	return new;
}

int rfapiHasNonRemovedRoutes(struct agg_node *rn)
{
	struct bgp_path_info *bpi;

	for (bpi = rn->info; bpi; bpi = bpi->next) {
		struct prefix pfx;

		if (!CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED)
		    && (bpi->extra && !rfapiGetUnAddrOfVpnBi(bpi, &pfx))) {

			return 1;
		}
	}
	return 0;
}

#ifdef DEBUG_IT_NODES
/*
 * DEBUG FUNCTION
 */
void rfapiDumpNode(struct agg_node *rn)
{
	struct bgp_path_info *bpi;

	vnc_zlog_debug_verbose("%s: rn=%p", __func__, rn);
	for (bpi = rn->info; bpi; bpi = bpi->next) {
		struct prefix pfx;
		int ctrc = rfapiGetUnAddrOfVpnBi(bpi, &pfx);
		int nr;

		if (!CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED)
		    && (bpi->extra && !ctrc)) {

			nr = 1;
		} else {
			nr = 0;
		}

		vnc_zlog_debug_verbose(
			"  bpi=%p, nr=%d, flags=0x%x, extra=%p, ctrc=%d", bpi,
			nr, bpi->flags, bpi->extra, ctrc);
	}
}
#endif

static int rfapiNhlAddNodeRoutes(
	struct agg_node *rn,		      /* in */
	struct rfapi_ip_prefix *rprefix,      /* in */
	uint32_t lifetime,		      /* in */
	int removed,			      /* in */
	struct rfapi_next_hop_entry **head,   /* in/out */
	struct rfapi_next_hop_entry **tail,   /* in/out */
	struct rfapi_ip_addr *exclude_vnaddr, /* omit routes to same NVE */
	struct agg_node *rfd_rib_node,	/* preload this NVE rib node */
	struct prefix *pfx_target_original)   /* query target */
{
	struct bgp_path_info *bpi;
	struct rfapi_next_hop_entry *new;
	struct prefix pfx_un;
	struct skiplist *seen_nexthops;
	int count = 0;
	const struct prefix *p = agg_node_get_prefix(rn);
	int is_l2 = (p->family == AF_ETHERNET);

	if (rfd_rib_node) {
		struct agg_table *atable = agg_get_table(rfd_rib_node);
		struct rfapi_descriptor *rfd;

		if (atable) {
			rfd = agg_get_table_info(atable);

			if (rfapiRibFTDFilterRecentPrefix(rfd, rn,
							  pfx_target_original))
				return 0;
		}
	}

	seen_nexthops =
		skiplist_new(0, vnc_prefix_cmp, prefix_free_lists);

	for (bpi = rn->info; bpi; bpi = bpi->next) {

		struct prefix pfx_vn;
		struct prefix *newpfx;

		if (removed && !CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED)) {
#ifdef DEBUG_RETURNED_NHL
			vnc_zlog_debug_verbose(
				"%s: want holddown, this route not holddown, skip",
				__func__);
#endif
			continue;
		}
		if (!removed && CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED)) {
			continue;
		}

		if (!bpi->extra) {
			continue;
		}

		/*
		 * Check for excluded VN address
		 */
		if (rfapiVpnBiNhEqualsPt(bpi, exclude_vnaddr))
			continue;

		/*
		 * Check for VN address (nexthop) copied already
		 */
		if (is_l2) {
			/* L2 routes: semantic nexthop in aux_prefix; VN addr
			 * ain't it */
			pfx_vn = bpi->extra->vnc->vnc.import.aux_prefix;
		} else {
			rfapiNexthop2Prefix(bpi->attr, &pfx_vn);
		}
		if (!skiplist_search(seen_nexthops, &pfx_vn, NULL)) {
#ifdef DEBUG_RETURNED_NHL
			vnc_zlog_debug_verbose(
				"%s: already put VN/nexthop %pFX, skip",
				__func__, &pfx_vn);
#endif
			continue;
		}

		if (rfapiGetUnAddrOfVpnBi(bpi, &pfx_un)) {
#ifdef DEBUG_ENCAP_MONITOR
			vnc_zlog_debug_verbose(
				"%s: failed to get UN address of this VPN bpi",
				__func__);
#endif
			continue;
		}

		newpfx = prefix_new();
		*newpfx = pfx_vn;
		skiplist_insert(seen_nexthops, newpfx, newpfx);

		new = rfapiRouteInfo2NextHopEntry(rprefix, bpi, lifetime, rn);
		if (new) {
			if (rfapiRibPreloadBi(rfd_rib_node, &pfx_vn, &pfx_un,
					      lifetime, bpi)) {
				/* duplicate filtered by RIB */
				rfapi_free_next_hop_list(new);
				new = NULL;
			}
		}

		if (new) {
			if (*tail) {
				(*tail)->next = new;
			} else {
				*head = new;
			}
			*tail = new;
			++count;
		}
	}

	skiplist_free(seen_nexthops);

	return count;
}


/*
 * Breadth-first
 *
 * omit_node is meant for the situation where we are adding a subtree
 * of a parent of some original requested node. The response already
 * contains the original requested node, and we don't want to duplicate
 * its routes in the list, so we skip it if the right or left node
 * matches (of course, we still travel down its child subtrees).
 */
static int rfapiNhlAddSubtree(
	struct agg_node *rn,		      /* in */
	uint32_t lifetime,		      /* in */
	struct rfapi_next_hop_entry **head,   /* in/out */
	struct rfapi_next_hop_entry **tail,   /* in/out */
	struct agg_node *omit_node,	   /* in */
	struct rfapi_ip_addr *exclude_vnaddr, /* omit routes to same NVE */
	struct agg_table *rfd_rib_table,      /* preload here */
	struct prefix *pfx_target_original)   /* query target */
{
	struct rfapi_ip_prefix rprefix;
	int rcount = 0;

	/* FIXME: need to find a better way here to work without sticking our
	 * hands in node->link */
	if (agg_node_left(rn) && agg_node_left(rn) != omit_node) {
		if (agg_node_left(rn)->info) {
			const struct prefix *p =
				agg_node_get_prefix(agg_node_left(rn));
			int count = 0;
			struct agg_node *rib_rn = NULL;

			rfapiQprefix2Rprefix(p, &rprefix);
			if (rfd_rib_table)
				rib_rn = agg_node_get(rfd_rib_table, p);

			count = rfapiNhlAddNodeRoutes(
				agg_node_left(rn), &rprefix, lifetime, 0, head,
				tail, exclude_vnaddr, rib_rn,
				pfx_target_original);
			if (!count) {
				count = rfapiNhlAddNodeRoutes(
					agg_node_left(rn), &rprefix, lifetime,
					1, head, tail, exclude_vnaddr, rib_rn,
					pfx_target_original);
			}
			rcount += count;
			if (rib_rn)
				agg_unlock_node(rib_rn);
		}
	}

	if (agg_node_right(rn) && agg_node_right(rn) != omit_node) {
		if (agg_node_right(rn)->info) {
			const struct prefix *p =
				agg_node_get_prefix(agg_node_right(rn));
			int count = 0;
			struct agg_node *rib_rn = NULL;

			rfapiQprefix2Rprefix(p, &rprefix);
			if (rfd_rib_table)
				rib_rn = agg_node_get(rfd_rib_table, p);

			count = rfapiNhlAddNodeRoutes(
				agg_node_right(rn), &rprefix, lifetime, 0, head,
				tail, exclude_vnaddr, rib_rn,
				pfx_target_original);
			if (!count) {
				count = rfapiNhlAddNodeRoutes(
					agg_node_right(rn), &rprefix, lifetime,
					1, head, tail, exclude_vnaddr, rib_rn,
					pfx_target_original);
			}
			rcount += count;
			if (rib_rn)
				agg_unlock_node(rib_rn);
		}
	}

	if (agg_node_left(rn)) {
		rcount += rfapiNhlAddSubtree(
			agg_node_left(rn), lifetime, head, tail, omit_node,
			exclude_vnaddr, rfd_rib_table, pfx_target_original);
	}
	if (agg_node_right(rn)) {
		rcount += rfapiNhlAddSubtree(
			agg_node_right(rn), lifetime, head, tail, omit_node,
			exclude_vnaddr, rfd_rib_table, pfx_target_original);
	}

	return rcount;
}

/*
 * Implementation of ROUTE_LIST(node) from RFAPI-Import-Event-Handling.txt
 *
 * Construct an rfapi nexthop list based on the routes attached to
 * the specified node.
 *
 * If there are any routes that do NOT have BGP_PATH_REMOVED set,
 * return those only. If there are ONLY routes with BGP_PATH_REMOVED,
 * then return those, and also include all the non-removed routes from the
 * next less-specific node (i.e., this node's parent) at the end.
 */
struct rfapi_next_hop_entry *rfapiRouteNode2NextHopList(
	struct agg_node *rn, uint32_t lifetime, /* put into nexthop entries */
	struct rfapi_ip_addr *exclude_vnaddr,   /* omit routes to same NVE */
	struct agg_table *rfd_rib_table,	/* preload here */
	struct prefix *pfx_target_original)     /* query target */
{
	struct rfapi_ip_prefix rprefix;
	struct rfapi_next_hop_entry *answer = NULL;
	struct rfapi_next_hop_entry *last = NULL;
	struct agg_node *parent;
	const struct prefix *p = agg_node_get_prefix(rn);
	int count = 0;
	struct agg_node *rib_rn;

#ifdef DEBUG_RETURNED_NHL
	vnc_zlog_debug_verbose("%s: called with node pfx=%rRN", __func__, rn);
	zlog_backtrace(LOG_INFO);
#endif

	rfapiQprefix2Rprefix(p, &rprefix);

	rib_rn = rfd_rib_table ? agg_node_get(rfd_rib_table, p) : NULL;

	/*
	 * Add non-withdrawn routes at this node
	 */
	count = rfapiNhlAddNodeRoutes(rn, &rprefix, lifetime, 0, &answer, &last,
				      exclude_vnaddr, rib_rn,
				      pfx_target_original);

	/*
	 * If the list has at least one entry, it's finished
	 */
	if (count) {
		count += rfapiNhlAddSubtree(rn, lifetime, &answer, &last, NULL,
					    exclude_vnaddr, rfd_rib_table,
					    pfx_target_original);
		vnc_zlog_debug_verbose("%s: %d nexthops, answer=%p", __func__,
				       count, answer);
#ifdef DEBUG_RETURNED_NHL
		rfapiPrintNhl(NULL, answer);
#endif
		if (rib_rn)
			agg_unlock_node(rib_rn);
		return answer;
	}

	/*
	 * Add withdrawn routes at this node
	 */
	count = rfapiNhlAddNodeRoutes(rn, &rprefix, lifetime, 1, &answer, &last,
				      exclude_vnaddr, rib_rn,
				      pfx_target_original);
	if (rib_rn)
		agg_unlock_node(rib_rn);

	// rfapiPrintNhl(NULL, answer);

	/*
	 * walk up the tree until we find a node with non-deleted
	 * routes, then add them
	 */
	for (parent = agg_node_parent(rn); parent;
	     parent = agg_node_parent(parent)) {
		if (rfapiHasNonRemovedRoutes(parent)) {
			break;
		}
	}

	/*
	 * Add non-withdrawn routes from less-specific prefix
	 */
	if (parent) {
		p = agg_node_get_prefix(parent);

		rib_rn = rfd_rib_table ? agg_node_get(rfd_rib_table, p) : NULL;
		rfapiQprefix2Rprefix(p, &rprefix);
		count += rfapiNhlAddNodeRoutes(parent, &rprefix, lifetime, 0,
					       &answer, &last, exclude_vnaddr,
					       rib_rn, pfx_target_original);
		count += rfapiNhlAddSubtree(parent, lifetime, &answer, &last,
					    rn, exclude_vnaddr, rfd_rib_table,
					    pfx_target_original);
		if (rib_rn)
			agg_unlock_node(rib_rn);
	} else {
		/*
		 * There is no parent with non-removed routes. Still need to
		 * add subtree of original node if it contributed routes to the
		 * answer.
		 */
		if (count)
			count += rfapiNhlAddSubtree(rn, lifetime, &answer,
						    &last, rn, exclude_vnaddr,
						    rfd_rib_table,
						    pfx_target_original);
	}

	vnc_zlog_debug_verbose("%s: %d nexthops, answer=%p", __func__, count,
			       answer);
#ifdef DEBUG_RETURNED_NHL
	rfapiPrintNhl(NULL, answer);
#endif
	return answer;
}

/*
 * Construct nexthop list of all routes in table
 */
struct rfapi_next_hop_entry *rfapiRouteTable2NextHopList(
	struct agg_table *rt, uint32_t lifetime, /* put into nexthop entries */
	struct rfapi_ip_addr *exclude_vnaddr,    /* omit routes to same NVE */
	struct agg_table *rfd_rib_table,    /* preload this NVE rib table */
	struct prefix *pfx_target_original) /* query target */
{
	struct agg_node *rn;
	struct rfapi_next_hop_entry *biglist = NULL;
	struct rfapi_next_hop_entry *nhl;
	struct rfapi_next_hop_entry *tail = NULL;
	int count = 0;

	for (rn = agg_route_top(rt); rn; rn = agg_route_next(rn)) {

		nhl = rfapiRouteNode2NextHopList(rn, lifetime, exclude_vnaddr,
						 rfd_rib_table,
						 pfx_target_original);
		if (!tail) {
			tail = biglist = nhl;
			if (tail)
				count = 1;
		} else {
			tail->next = nhl;
		}
		if (tail) {
			while (tail->next) {
				++count;
				tail = tail->next;
			}
		}
	}

	vnc_zlog_debug_verbose("%s: returning %d routes", __func__, count);
	return biglist;
}

struct rfapi_next_hop_entry *rfapiEthRouteNode2NextHopList(
	struct agg_node *rn, struct rfapi_ip_prefix *rprefix,
	uint32_t lifetime,		      /* put into nexthop entries */
	struct rfapi_ip_addr *exclude_vnaddr, /* omit routes to same NVE */
	struct agg_table *rfd_rib_table,      /* preload NVE rib table */
	struct prefix *pfx_target_original)   /* query target */
{
	int count = 0;
	struct rfapi_next_hop_entry *answer = NULL;
	struct rfapi_next_hop_entry *last = NULL;
	struct agg_node *rib_rn;

	rib_rn = rfd_rib_table
			 ? agg_node_get(rfd_rib_table, agg_node_get_prefix(rn))
			 : NULL;

	count = rfapiNhlAddNodeRoutes(rn, rprefix, lifetime, 0, &answer, &last,
				      NULL, rib_rn, pfx_target_original);

#ifdef DEBUG_ENCAP_MONITOR
	vnc_zlog_debug_verbose("%s: node %p: %d non-holddown routes", __func__,
			       rn, count);
#endif

	if (!count) {
		count = rfapiNhlAddNodeRoutes(rn, rprefix, lifetime, 1, &answer,
					      &last, exclude_vnaddr, rib_rn,
					      pfx_target_original);
		vnc_zlog_debug_verbose("%s: node %p: %d holddown routes",
				       __func__, rn, count);
	}

	if (rib_rn)
		agg_unlock_node(rib_rn);

#ifdef DEBUG_RETURNED_NHL
	rfapiPrintNhl(NULL, answer);
#endif

	return answer;
}


/*
 * Construct nexthop list of all routes in table
 */
struct rfapi_next_hop_entry *rfapiEthRouteTable2NextHopList(
	uint32_t logical_net_id, struct rfapi_ip_prefix *rprefix,
	uint32_t lifetime,		      /* put into nexthop entries */
	struct rfapi_ip_addr *exclude_vnaddr, /* omit routes to same NVE */
	struct agg_table *rfd_rib_table,      /* preload NVE rib node */
	struct prefix *pfx_target_original)   /* query target */
{
	struct rfapi_import_table *it;
	struct bgp *bgp = bgp_get_default();
	struct agg_table *rt;
	struct agg_node *rn;
	struct rfapi_next_hop_entry *biglist = NULL;
	struct rfapi_next_hop_entry *nhl;
	struct rfapi_next_hop_entry *tail = NULL;
	int count = 0;


	it = rfapiMacImportTableGet(bgp, logical_net_id);
	rt = it->imported_vpn[AFI_L2VPN];

	for (rn = agg_route_top(rt); rn; rn = agg_route_next(rn)) {

		nhl = rfapiEthRouteNode2NextHopList(
			rn, rprefix, lifetime, exclude_vnaddr, rfd_rib_table,
			pfx_target_original);
		if (!tail) {
			tail = biglist = nhl;
			if (tail)
				count = 1;
		} else {
			tail->next = nhl;
		}
		if (tail) {
			while (tail->next) {
				++count;
				tail = tail->next;
			}
		}
	}

	vnc_zlog_debug_verbose("%s: returning %d routes", __func__, count);
	return biglist;
}

/*
 * Insert a new bpi to the imported route table node,
 * keeping the list of BPIs sorted best route first
 */
static void rfapiBgpInfoAttachSorted(struct agg_node *rn,
				     struct bgp_path_info *info_new, afi_t afi,
				     safi_t safi)
{
	struct bgp *bgp;
	struct bgp_path_info *prev;
	struct bgp_path_info *next;
	char pfx_buf[PREFIX2STR_BUFFER] = {};


	bgp = bgp_get_default(); /* assume 1 instance for now */

	if (VNC_DEBUG(IMPORT_BI_ATTACH)) {
		vnc_zlog_debug_verbose("%s: info_new->peer=%p", __func__,
				       info_new->peer);
		vnc_zlog_debug_verbose("%s: info_new->peer->su_remote=%p", __func__,
				       info_new->peer->connection->su_remote);
	}

	for (prev = NULL, next = rn->info; next;
	     prev = next, next = next->next) {
		enum bgp_path_selection_reason reason;

		if (!bgp
		    || (!CHECK_FLAG(info_new->flags, BGP_PATH_REMOVED)
			&& CHECK_FLAG(next->flags, BGP_PATH_REMOVED))
		    || bgp_path_info_cmp_compatible(bgp, info_new, next,
						    pfx_buf, afi, safi,
						    &reason)
			       == -1) { /* -1 if 1st is better */
			break;
		}
	}
	vnc_zlog_debug_verbose("%s: prev=%p, next=%p", __func__, prev, next);
	if (prev) {
		prev->next = info_new;
	} else {
		rn->info = info_new;
	}
	info_new->prev = prev;
	info_new->next = next;
	if (next)
		next->prev = info_new;
	bgp_attr_intern(info_new->attr);
}

static void rfapiBgpInfoDetach(struct agg_node *rn, struct bgp_path_info *bpi)
{
	/*
	 * Remove the route (doubly-linked)
	 */
	//  bgp_attr_unintern (&bpi->attr);
	if (bpi->next)
		bpi->next->prev = bpi->prev;
	if (bpi->prev)
		bpi->prev->next = bpi->next;
	else
		rn->info = bpi->next;
}

/*
 * For L3-indexed import tables
 */
static int rfapi_bi_peer_rd_cmp(const void *b1, const void *b2)
{
	const struct bgp_path_info *bpi1 = b1;
	const struct bgp_path_info *bpi2 = b2;

	/*
	 * Compare peers
	 */
	if (bpi1->peer < bpi2->peer)
		return -1;
	if (bpi1->peer > bpi2->peer)
		return 1;

	/*
	 * compare RDs
	 */
	return vnc_prefix_cmp((const struct prefix *)&bpi1->extra->vnc->vnc
				      .import.rd,
			      (const struct prefix *)&bpi2->extra->vnc->vnc
				      .import.rd);
}

/*
 * For L2-indexed import tables
 * The BPIs in these tables should ALWAYS have an aux_prefix set because
 * they arrive via IPv4 or IPv6 advertisements.
 */
static int rfapi_bi_peer_rd_aux_cmp(const void *b1, const void *b2)
{
	const struct bgp_path_info *bpi1 = b1;
	const struct bgp_path_info *bpi2 = b2;
	int rc;

	/*
	 * Compare peers
	 */
	if (bpi1->peer < bpi2->peer)
		return -1;
	if (bpi1->peer > bpi2->peer)
		return 1;

	/*
	 * compare RDs
	 */
	rc = vnc_prefix_cmp((struct prefix *)&bpi1->extra->vnc->vnc.import.rd,
			    (struct prefix *)&bpi2->extra->vnc->vnc.import.rd);
	if (rc) {
		return rc;
	}

	/*
	 * L2 import tables can have multiple entries with the
	 * same MAC address, same RD, but different L3 addresses.
	 *
	 * Use presence of aux_prefix with AF=ethernet and prefixlen=1
	 * as magic value to signify explicit wildcarding of the aux_prefix.
	 * This magic value will not appear in bona fide bpi entries in
	 * the import table, but is allowed in the "fake" bpi used to
	 * probe the table when searching. (We have to test both b1 and b2
	 * because there is no guarantee of the order the test key and
	 * the real key will be passed)
	 */
	if ((bpi1->extra->vnc->vnc.import.aux_prefix.family == AF_ETHERNET &&
	     (bpi1->extra->vnc->vnc.import.aux_prefix.prefixlen == 1)) ||
	    (bpi2->extra->vnc->vnc.import.aux_prefix.family == AF_ETHERNET &&
	     (bpi2->extra->vnc->vnc.import.aux_prefix.prefixlen == 1))) {
		/*
		 * wildcard aux address specified
		 */
		return 0;
	}

	return vnc_prefix_cmp(&bpi1->extra->vnc->vnc.import.aux_prefix,
			      &bpi2->extra->vnc->vnc.import.aux_prefix);
}


/*
 * Index on RD and Peer
 */
static void rfapiItBiIndexAdd(struct agg_node *rn, /* Import table VPN node */
			      struct bgp_path_info *bpi) /* new BPI */
{
	struct skiplist *sl;
	const struct prefix *p;

	assert(rn);
	assert(bpi);
	assert(bpi->extra);

	vnc_zlog_debug_verbose("%s: bpi %p, peer %p, rd %pRDP", __func__, bpi,
			       bpi->peer, &bpi->extra->vnc->vnc.import.rd);

	sl = RFAPI_RDINDEX_W_ALLOC(rn);
	if (!sl) {
		p = agg_node_get_prefix(rn);
		if (AF_ETHERNET == p->family) {
			sl = skiplist_new(0, rfapi_bi_peer_rd_aux_cmp, NULL);
		} else {
			sl = skiplist_new(0, rfapi_bi_peer_rd_cmp, NULL);
		}
		RFAPI_IT_EXTRA_GET(rn)->u.vpn.idx_rd = sl;
		agg_lock_node(rn); /* for skiplist */
	}
	assert(!skiplist_insert(sl, (void *)bpi, (void *)bpi));
	agg_lock_node(rn); /* for skiplist entry */

	/* NB: BPIs in import tables are not refcounted */
}

static void rfapiItBiIndexDump(struct agg_node *rn)
{
	struct skiplist *sl;
	void *cursor = NULL;
	struct bgp_path_info *k;
	struct bgp_path_info *v;
	int rc;

	sl = RFAPI_RDINDEX(rn);
	if (!sl)
		return;

	for (rc = skiplist_next(sl, (void **)&k, (void **)&v, &cursor); !rc;
	     rc = skiplist_next(sl, (void **)&k, (void **)&v, &cursor)) {

		char buf[RD_ADDRSTRLEN];
		char buf_aux_pfx[PREFIX_STRLEN];

		prefix_rd2str(&k->extra->vnc->vnc.import.rd, buf, sizeof(buf),
			      bgp_get_asnotation(k->peer ? k->peer->bgp : NULL));
		if (k->extra->vnc->vnc.import.aux_prefix.family) {
			prefix2str(&k->extra->vnc->vnc.import.aux_prefix,
				   buf_aux_pfx, sizeof(buf_aux_pfx));
		} else
			strlcpy(buf_aux_pfx, "(none)", sizeof(buf_aux_pfx));

		vnc_zlog_debug_verbose("bpi %p, peer %p, rd %s, aux_prefix %s",
				       k, k->peer, buf, buf_aux_pfx);
	}
}

static struct bgp_path_info *rfapiItBiIndexSearch(
	struct agg_node *rn, /* Import table VPN node */
	struct prefix_rd *prd, struct peer *peer,
	const struct prefix *aux_prefix) /* optional L3 addr for L2 ITs */
{
	struct skiplist *sl;
	int rc;
	struct bgp_path_info bpi_fake = {0};
	struct bgp_path_info_extra bpi_extra = {0};
	struct bgp_path_info_extra_vnc bpi_extra_vnc = { 0 };
	struct bgp_path_info *bpi_result;

	sl = RFAPI_RDINDEX(rn);
	if (!sl)
		return NULL;

#ifdef DEBUG_BI_SEARCH
	{
		char buf_aux_pfx[PREFIX_STRLEN];

		if (aux_prefix) {
			prefix2str(aux_prefix, buf_aux_pfx,
				   sizeof(buf_aux_pfx));
		} else
			strlcpy(buf_aux_pfx, "(nil)", sizeof(buf_aux_pfx));

		vnc_zlog_debug_verbose(
			"%s want prd=%pRDP, peer=%p, aux_prefix=%s", __func__,
			prd, peer, buf_aux_pfx);
		rfapiItBiIndexDump(rn);
	}
#endif

	/* threshold is a WAG */
	if (sl->count < 3) {
#ifdef DEBUG_BI_SEARCH
		vnc_zlog_debug_verbose("%s: short list algorithm", __func__);
#endif
		/* if short list, linear search might be faster */
		for (bpi_result = rn->info; bpi_result;
		     bpi_result = bpi_result->next) {
#ifdef DEBUG_BI_SEARCH
			vnc_zlog_debug_verbose("%s: bpi has prd=%pRDP, peer=%p",
					       __func__,
					       &bpi_result->extra->vnc->vnc
							.import.rd,
					       bpi_result->peer);
#endif
			if (peer == bpi_result->peer &&
			    !prefix_cmp((struct prefix *)&bpi_result->extra->vnc
						->vnc.import.rd,
					(struct prefix *)prd)) {
#ifdef DEBUG_BI_SEARCH
				vnc_zlog_debug_verbose(
					"%s: peer and RD same, doing aux_prefix check",
					__func__);
#endif
				if (!aux_prefix ||
				    !prefix_cmp(aux_prefix,
						&bpi_result->extra->vnc->vnc
							 .import.aux_prefix)) {
#ifdef DEBUG_BI_SEARCH
					vnc_zlog_debug_verbose("%s: match",
							       __func__);
#endif
					break;
				}
			}
		}
		return bpi_result;
	}

	bpi_fake.peer = peer;
	bpi_fake.extra = &bpi_extra;
	bpi_fake.extra->vnc = &bpi_extra_vnc;
	bpi_fake.extra->vnc->vnc.import.rd = *prd;
	if (aux_prefix) {
		bpi_fake.extra->vnc->vnc.import.aux_prefix = *aux_prefix;
	} else {
		/* wildcard */
		bpi_fake.extra->vnc->vnc.import.aux_prefix.family = AF_ETHERNET;
		bpi_fake.extra->vnc->vnc.import.aux_prefix.prefixlen = 1;
	}

	rc = skiplist_search(sl, (void *)&bpi_fake, (void *)&bpi_result);

	if (rc) {
#ifdef DEBUG_BI_SEARCH
		vnc_zlog_debug_verbose("%s: no match", __func__);
#endif
		return NULL;
	}

#ifdef DEBUG_BI_SEARCH
	vnc_zlog_debug_verbose("%s: matched bpi=%p", __func__, bpi_result);
#endif

	return bpi_result;
}

static void rfapiItBiIndexDel(struct agg_node *rn, /* Import table VPN node */
			      struct bgp_path_info *bpi) /* old BPI */
{
	struct skiplist *sl;
	int rc;

	vnc_zlog_debug_verbose("%s: bpi %p, peer %p, rd %pRDP", __func__, bpi,
			       bpi->peer, &bpi->extra->vnc->vnc.import.rd);

	sl = RFAPI_RDINDEX(rn);
	assert(sl);

	rc = skiplist_delete(sl, (void *)(bpi), (void *)bpi);
	if (rc) {
		rfapiItBiIndexDump(rn);
	}
	assert(!rc);

	agg_unlock_node(rn); /* for skiplist entry */

	/* NB: BPIs in import tables are not refcounted */
}

/*
 * Add a backreference at the ENCAP node to the VPN route that
 * refers to it
 */
static void
rfapiMonitorEncapAdd(struct rfapi_import_table *import_table,
		     struct prefix *p,		    /* VN address */
		     struct agg_node *vpn_rn,       /* VPN node */
		     struct bgp_path_info *vpn_bpi) /* VPN bpi/route */
{
	afi_t afi = family2afi(p->family);
	struct agg_node *rn;
	struct rfapi_monitor_encap *m;

	assert(afi);
	rn = agg_node_get(import_table->imported_encap[afi], p); /* locks rn */
	assert(rn);

	m = XCALLOC(MTYPE_RFAPI_MONITOR_ENCAP,
		    sizeof(struct rfapi_monitor_encap));

	m->node = vpn_rn;
	m->bpi = vpn_bpi;
	m->rn = rn;

	/* insert to encap node's list */
	m->next = RFAPI_MONITOR_ENCAP(rn);
	if (m->next)
		m->next->prev = m;
	RFAPI_MONITOR_ENCAP_W_ALLOC(rn) = m;

	/* for easy lookup when deleting vpn route */
	vpn_bpi->extra->vnc->vnc.import.hme = m;

	vnc_zlog_debug_verbose("%s: it=%p, vpn_bpi=%p, afi=%d, encap rn=%p, setting vpn_bpi->extra->vnc->vnc.import.hme=%p",
			       __func__, import_table, vpn_bpi, afi, rn, m);

	RFAPI_CHECK_REFCOUNT(rn, SAFI_ENCAP, 0);
	bgp_attr_intern(vpn_bpi->attr);
}

static void rfapiMonitorEncapDelete(struct bgp_path_info *vpn_bpi)
{
	/*
	 * Remove encap monitor
	 */
	vnc_zlog_debug_verbose("%s: vpn_bpi=%p", __func__, vpn_bpi);
	if (vpn_bpi->extra) {
		struct rfapi_monitor_encap *hme =
			vpn_bpi->extra->vnc->vnc.import.hme;

		if (hme) {

			vnc_zlog_debug_verbose("%s: hme=%p", __func__, hme);

			/* Refcount checking takes too long here */
			// RFAPI_CHECK_REFCOUNT(hme->rn, SAFI_ENCAP, 0);
			if (hme->next)
				hme->next->prev = hme->prev;
			if (hme->prev)
				hme->prev->next = hme->next;
			else
				RFAPI_MONITOR_ENCAP_W_ALLOC(hme->rn) =
					hme->next;
			/* Refcount checking takes too long here */
			// RFAPI_CHECK_REFCOUNT(hme->rn, SAFI_ENCAP, 1);

			/* see if the struct rfapi_it_extra is empty and can be
			 * freed */
			rfapiMonitorExtraPrune(SAFI_ENCAP, hme->rn);

			agg_unlock_node(hme->rn); /* decr ref count */
			XFREE(MTYPE_RFAPI_MONITOR_ENCAP, hme);
			vpn_bpi->extra->vnc->vnc.import.hme = NULL;
		}
	}
}

/*
 * Timer callback for withdraw
 */
static void rfapiWithdrawTimerVPN(struct event *t)
{
	struct rfapi_withdraw *wcb = EVENT_ARG(t);
	struct bgp_path_info *bpi = wcb->info;
	struct bgp *bgp = bgp_get_default();
	const struct prefix *p;
	struct rfapi_monitor_vpn *moved;
	afi_t afi;
	bool early_exit = false;

	if (bgp == NULL) {
		vnc_zlog_debug_verbose(
                   "%s: NULL BGP pointer, assume shutdown race condition!!!",
                   __func__);
		early_exit = true;
	}
	if (bgp && CHECK_FLAG(bgp->flags, BGP_FLAG_DELETE_IN_PROGRESS)) {
		vnc_zlog_debug_verbose(
			"%s: BGP delete in progress, assume shutdown race condition!!!",
			__func__);
		early_exit = true;
	}

	/* This callback is responsible for the withdraw object's memory */
	if (early_exit) {
		rwcb_del(&_rwcbhash, wcb);
		XFREE(MTYPE_RFAPI_WITHDRAW, wcb);
		return;
	}

	assert(wcb->node);
	assert(bpi);
	assert(wcb->import_table);
	assert(bpi->extra);

	RFAPI_CHECK_REFCOUNT(wcb->node, SAFI_MPLS_VPN, wcb->lockoffset);

	vnc_zlog_debug_verbose("%s: removing bpi %p at prefix %pRN", __func__,
			       bpi, wcb->node);

	/*
	 * Remove the route (doubly-linked)
	 */
	if (CHECK_FLAG(bpi->flags, BGP_PATH_VALID)
	    && VALID_INTERIOR_TYPE(bpi->type))
		RFAPI_MONITOR_EXTERIOR(wcb->node)->valid_interior_count--;

	p = agg_node_get_prefix(wcb->node);
	afi = family2afi(p->family);
	wcb->import_table->holddown_count[afi] -= 1; /* keep count consistent */
	rfapiItBiIndexDel(wcb->node, bpi);
	rfapiBgpInfoDetach(wcb->node, bpi); /* with removed bpi */

	vnc_import_bgp_exterior_del_route_interior(bgp, wcb->import_table,
						   wcb->node, bpi);


	/*
	 * If VNC is configured to send response remove messages, AND
	 * if the removed route had a UN address, do response removal
	 * processing.
	 */
	if (!(bgp->rfapi_cfg->flags
	      & BGP_VNC_CONFIG_RESPONSE_REMOVAL_DISABLE)) {

		int has_valid_duplicate = 0;
		struct bgp_path_info *bpii;

		/*
		 * First check if there are any OTHER routes at this node
		 * that have the same nexthop and a valid UN address. If
		 * there are (e.g., from other peers), then the route isn't
		 * really gone, so skip sending a response removal message.
		 */
		for (bpii = wcb->node->info; bpii; bpii = bpii->next) {
			if (rfapiVpnBiSamePtUn(bpi, bpii)) {
				has_valid_duplicate = 1;
				break;
			}
		}

		vnc_zlog_debug_verbose("%s: has_valid_duplicate=%d", __func__,
				       has_valid_duplicate);

		if (!has_valid_duplicate) {
			rfapiRibPendingDeleteRoute(bgp, wcb->import_table, afi,
						   wcb->node);
		}
	}

	rfapiMonitorEncapDelete(bpi);

	/*
	 * If there are no VPN monitors at this VPN Node A,
	 * we are done
	 */
	if (!RFAPI_MONITOR_VPN(wcb->node)) {
		vnc_zlog_debug_verbose("%s: no VPN monitors at this node",
				       __func__);
		goto done;
	}

	/*
	 * rfapiMonitorMoveShorter only moves monitors if there are
	 * no remaining valid routes at the current node
	 */
	moved = rfapiMonitorMoveShorter(wcb->node, 1);

	if (moved) {
		rfapiMonitorMovedUp(wcb->import_table, wcb->node, moved->node,
				    moved);
	}

done:
	/*
	 * Free VPN bpi
	 */
	rfapiBgpInfoFree(bpi);
	wcb->info = NULL;

	/*
	 * If route count at this node has gone to 0, withdraw exported prefix
	 */
	if (!wcb->node->info) {
		/* see if the struct rfapi_it_extra is empty and can be freed */
		rfapiMonitorExtraPrune(SAFI_MPLS_VPN, wcb->node);
		vnc_direct_bgp_del_prefix(bgp, wcb->import_table, wcb->node);
		vnc_zebra_del_prefix(bgp, wcb->import_table, wcb->node);
	} else {
		/*
		 * nexthop change event
		 * vnc_direct_bgp_add_prefix() will recompute the VN addr
		 * ecommunity
		 */
		vnc_direct_bgp_add_prefix(bgp, wcb->import_table, wcb->node);
	}

	RFAPI_CHECK_REFCOUNT(wcb->node, SAFI_MPLS_VPN, 1 + wcb->lockoffset);
	agg_unlock_node(wcb->node); /* decr ref count */
	rwcb_del(&_rwcbhash, wcb);
	XFREE(MTYPE_RFAPI_WITHDRAW, wcb);
}

/*
 * This works for multiprotocol extension, but not for plain ol'
 * unicast IPv4 because that nexthop is stored in attr->nexthop
 */
void rfapiNexthop2Prefix(struct attr *attr, struct prefix *p)
{
	assert(p);
	assert(attr);

	memset(p, 0, sizeof(struct prefix));

	switch (p->family = BGP_MP_NEXTHOP_FAMILY(attr->mp_nexthop_len)) {
	case AF_INET:
		p->u.prefix4 = attr->mp_nexthop_global_in;
		p->prefixlen = IPV4_MAX_BITLEN;
		break;

	case AF_INET6:
		p->u.prefix6 = attr->mp_nexthop_global;
		p->prefixlen = IPV6_MAX_BITLEN;
		break;

	default:
		vnc_zlog_debug_verbose("%s: Family is unknown = %d", __func__,
				       p->family);
	}
}

void rfapiUnicastNexthop2Prefix(afi_t afi, struct attr *attr, struct prefix *p)
{
	if (afi == AFI_IP) {
		p->family = AF_INET;
		p->prefixlen = IPV4_MAX_BITLEN;
		p->u.prefix4 = attr->nexthop;
	} else {
		rfapiNexthop2Prefix(attr, p);
	}
}

static int rfapiAttrNexthopAddrDifferent(struct prefix *p1, struct prefix *p2)
{
	if (!p1 || !p2) {
		vnc_zlog_debug_verbose("%s: p1 or p2 is NULL", __func__);
		return 1;
	}

	/*
	 * Are address families the same?
	 */
	if (p1->family != p2->family) {
		return 1;
	}

	switch (p1->family) {
	case AF_INET:
		if (IPV4_ADDR_SAME(&p1->u.prefix4, &p2->u.prefix4))
			return 0;
		break;

	case AF_INET6:
		if (IPV6_ADDR_SAME(&p1->u.prefix6, &p2->u.prefix6))
			return 0;
		break;

	default:
		assert(1);
	}

	return 1;
}

static void rfapiCopyUnEncap2VPN(struct bgp_path_info *encap_bpi,
				 struct bgp_path_info *vpn_bpi)
{
	if (!vpn_bpi || !vpn_bpi->extra) {
		zlog_warn("%s: no vpn  bpi attr/extra, can't copy UN address",
			  __func__);
		return;
	}

	switch (BGP_MP_NEXTHOP_FAMILY(encap_bpi->attr->mp_nexthop_len)) {
	case AF_INET:

		/*
		 * instrumentation to debug segfault of 091127
		 */
		vnc_zlog_debug_verbose("%s: vpn_bpi=%p", __func__, vpn_bpi);
		vnc_zlog_debug_verbose("%s: vpn_bpi->extra=%p", __func__,
				       vpn_bpi->extra);

		vpn_bpi->extra->vnc->vnc.import.un_family = AF_INET;
		vpn_bpi->extra->vnc->vnc.import.un.addr4 =
			encap_bpi->attr->mp_nexthop_global_in;
		break;

	case AF_INET6:
		vpn_bpi->extra->vnc->vnc.import.un_family = AF_INET6;
		vpn_bpi->extra->vnc->vnc.import.un.addr6 =
			encap_bpi->attr->mp_nexthop_global;
		break;

	default:
		zlog_warn("%s: invalid encap nexthop length: %d", __func__,
			  encap_bpi->attr->mp_nexthop_len);
		vpn_bpi->extra->vnc->vnc.import.un_family = AF_UNSPEC;
		break;
	}
}

/*
 * returns 0 on success, nonzero on error
 */
static int
rfapiWithdrawEncapUpdateCachedUn(struct rfapi_import_table *import_table,
				 struct bgp_path_info *encap_bpi,
				 struct agg_node *vpn_rn,
				 struct bgp_path_info *vpn_bpi)
{
	if (!encap_bpi) {

		/*
		 * clear cached UN address
		 */
		if (!vpn_bpi || !vpn_bpi->extra) {
			zlog_warn(
				"%s: missing VPN bpi/extra, can't clear UN addr",
				__func__);
			return 1;
		}
		vpn_bpi->extra->vnc->vnc.import.un_family = AF_UNSPEC;
		memset(&vpn_bpi->extra->vnc->vnc.import.un, 0,
		       sizeof(vpn_bpi->extra->vnc->vnc.import.un));
		if (CHECK_FLAG(vpn_bpi->flags, BGP_PATH_VALID)) {
			if (rfapiGetVncTunnelUnAddr(vpn_bpi->attr, NULL)) {
				UNSET_FLAG(vpn_bpi->flags, BGP_PATH_VALID);
				if (VALID_INTERIOR_TYPE(vpn_bpi->type))
					RFAPI_MONITOR_EXTERIOR(vpn_rn)
						->valid_interior_count--;
				/* signal interior route withdrawal to
				 * import-exterior */
				vnc_import_bgp_exterior_del_route_interior(
					bgp_get_default(), import_table, vpn_rn,
					vpn_bpi);
			}
		}

	} else {
		if (!vpn_bpi) {
			zlog_warn("%s: missing VPN bpi, can't clear UN addr",
				  __func__);
			return 1;
		}
		rfapiCopyUnEncap2VPN(encap_bpi, vpn_bpi);
		if (!CHECK_FLAG(vpn_bpi->flags, BGP_PATH_VALID)) {
			SET_FLAG(vpn_bpi->flags, BGP_PATH_VALID);
			if (VALID_INTERIOR_TYPE(vpn_bpi->type))
				RFAPI_MONITOR_EXTERIOR(vpn_rn)
					->valid_interior_count++;
			/* signal interior route withdrawal to import-exterior
			 */
			vnc_import_bgp_exterior_add_route_interior(
				bgp_get_default(), import_table, vpn_rn,
				vpn_bpi);
		}
	}
	return 0;
}

static void rfapiWithdrawTimerEncap(struct event *t)
{
	struct rfapi_withdraw *wcb = EVENT_ARG(t);
	struct bgp_path_info *bpi = wcb->info;
	int was_first_route = 0;
	struct rfapi_monitor_encap *em;
	struct skiplist *vpn_node_sl = skiplist_new(0, NULL, NULL);

	assert(wcb->node);
	assert(bpi);
	assert(wcb->import_table);

	RFAPI_CHECK_REFCOUNT(wcb->node, SAFI_ENCAP, 0);

	if (wcb->node->info == bpi)
		was_first_route = 1;

	/*
	 * Remove the route/bpi and free it
	 */
	rfapiBgpInfoDetach(wcb->node, bpi);
	rfapiBgpInfoFree(bpi);

	if (!was_first_route)
		goto done;

	for (em = RFAPI_MONITOR_ENCAP(wcb->node); em; em = em->next) {

		/*
		 * Update monitoring VPN BPIs with new encap info at the
		 * head of the encap bpi chain (which could be NULL after
		 * removing the expiring bpi above)
		 */
		if (rfapiWithdrawEncapUpdateCachedUn(wcb->import_table,
						     wcb->node->info, em->node,
						     em->bpi))
			continue;

		/*
		 * Build a list of unique VPN nodes referenced by these
		 * monitors.
		 * Use a skiplist for speed.
		 */
		skiplist_insert(vpn_node_sl, em->node, em->node);
	}


	/*
	 * for each VPN node referenced in the ENCAP monitors:
	 */
	struct agg_node *rn;
	while (!skiplist_first(vpn_node_sl, (void **)&rn, NULL)) {
		if (!wcb->node->info) {
			struct rfapi_monitor_vpn *moved;

			moved = rfapiMonitorMoveShorter(rn, 0);
			if (moved) {
				// rfapiDoRouteCallback(wcb->import_table,
				// moved->node, moved);
				rfapiMonitorMovedUp(wcb->import_table, rn,
						    moved->node, moved);
			}
		} else {
			// rfapiDoRouteCallback(wcb->import_table, rn, NULL);
			rfapiMonitorItNodeChanged(wcb->import_table, rn, NULL);
		}
		skiplist_delete_first(vpn_node_sl);
	}

done:
	RFAPI_CHECK_REFCOUNT(wcb->node, SAFI_ENCAP, 1);
	agg_unlock_node(wcb->node); /* decr ref count */
	rwcb_del(&_rwcbhash, wcb);
	XFREE(MTYPE_RFAPI_WITHDRAW, wcb);
	skiplist_free(vpn_node_sl);
}


/*
 * Works for both VPN and ENCAP routes; timer_service_func is different
 * in each case
 */
static void
rfapiBiStartWithdrawTimer(struct rfapi_import_table *import_table,
			  struct agg_node *rn, struct bgp_path_info *bpi,
			  afi_t afi, safi_t safi,
			  void (*timer_service_func)(struct event *))
{
	uint32_t lifetime;
	struct rfapi_withdraw *wcb;

	if (CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED)) {
		/*
		 * Already on the path to being withdrawn,
		 * should already have a timer set up to
		 * delete it.
		 */
		vnc_zlog_debug_verbose(
			"%s: already being withdrawn, do nothing", __func__);
		return;
	}

	rfapiGetVncLifetime(bpi->attr, &lifetime);
	vnc_zlog_debug_verbose("%s: VNC lifetime is %u", __func__, lifetime);

	/*
	 * withdrawn routes get to hang around for a while
	 */
	SET_FLAG(bpi->flags, BGP_PATH_REMOVED);

	/* set timer to remove the route later */
	lifetime = rfapiGetHolddownFromLifetime(lifetime);
	vnc_zlog_debug_verbose("%s: using timeout %u", __func__, lifetime);

	/*
	 * Stash import_table, node, and info for use by timer
	 * service routine, which is supposed to free the wcb.
	 */
	wcb = XCALLOC(MTYPE_RFAPI_WITHDRAW, sizeof(struct rfapi_withdraw));
	wcb->node = rn;
	wcb->info = bpi;
	wcb->import_table = import_table;
	wcb->timer_service_func = timer_service_func;
	rwcb_add(&_rwcbhash, wcb);
	bgp_attr_intern(bpi->attr);

	if (VNC_DEBUG(VERBOSE)) {
		vnc_zlog_debug_verbose(
			"%s: wcb values: node=%p, info=%p, import_table=%p (bpi follows)",
			__func__, wcb->node, wcb->info, wcb->import_table);
		rfapiPrintBi(NULL, bpi);
	}


	assert(bpi->extra);
	if (lifetime > UINT32_MAX / 1001) {
		/* sub-optimal case, but will probably never happen */
		bpi->extra->vnc->vnc.import.timer = NULL;
		event_add_timer(bm->master, timer_service_func, wcb, lifetime,
				&bpi->extra->vnc->vnc.import.timer);
	} else {
		static uint32_t jitter;
		uint32_t lifetime_msec;

		/*
		 * the goal here is to spread out the timers so they are
		 * sortable in the skip list
		 */
		if (++jitter >= 1000)
			jitter = 0;

		lifetime_msec = (lifetime * 1000) + jitter;

		bpi->extra->vnc->vnc.import.timer = NULL;
		event_add_timer_msec(bm->master, timer_service_func, wcb,
				     lifetime_msec,
				     &bpi->extra->vnc->vnc.import.timer);
	}

	/* re-sort route list (BGP_PATH_REMOVED routes are last) */
	if (((struct bgp_path_info *)rn->info)->next) {
		rfapiBgpInfoDetach(rn, bpi);
		rfapiBgpInfoAttachSorted(rn, bpi, afi, safi);
	}
}


typedef void(rfapi_bi_filtered_import_f)(struct rfapi_import_table *table,
					 int action, struct peer *peer,
					 void *rfd, const struct prefix *prefix,
					 const struct prefix *aux_prefix,
					 afi_t afi, struct prefix_rd *prd,
					 struct attr *attr, uint8_t type,
					 uint8_t sub_type, uint32_t *label);


static void rfapiExpireEncapNow(struct rfapi_import_table *it,
				struct agg_node *rn, struct bgp_path_info *bpi)
{
	struct rfapi_withdraw *wcb;
	struct event t;

	/*
	 * pretend we're an expiring timer
	 */
	wcb = XCALLOC(MTYPE_RFAPI_WITHDRAW, sizeof(struct rfapi_withdraw));
	wcb->info = bpi;
	wcb->node = rn;
	wcb->import_table = it;
	rwcb_add(&_rwcbhash, wcb);
	memset(&t, 0, sizeof(t));
	t.arg = wcb;
	rfapiWithdrawTimerEncap(&t); /* frees wcb */
}

static int rfapiGetNexthop(struct attr *attr, struct prefix *prefix)
{
	switch (BGP_MP_NEXTHOP_FAMILY(attr->mp_nexthop_len)) {
	case AF_INET:
		prefix->family = AF_INET;
		prefix->prefixlen = IPV4_MAX_BITLEN;
		prefix->u.prefix4 = attr->mp_nexthop_global_in;
		break;
	case AF_INET6:
		prefix->family = AF_INET6;
		prefix->prefixlen = IPV6_MAX_BITLEN;
		prefix->u.prefix6 = attr->mp_nexthop_global;
		break;
	default:
		vnc_zlog_debug_verbose("%s: unknown attr->mp_nexthop_len %d",
				       __func__, attr->mp_nexthop_len);
		return EINVAL;
	}
	return 0;
}

/*
 * import a bgp_path_info if its route target list intersects with the
 * import table's route target list
 */
static void rfapiBgpInfoFilteredImportEncap(
	struct rfapi_import_table *import_table, int action, struct peer *peer,
	void *rfd, /* set for looped back routes */
	const struct prefix *p,
	const struct prefix *aux_prefix, /* Unused for encap routes */
	afi_t afi, struct prefix_rd *prd,
	struct attr *attr, /* part of bgp_path_info */
	uint8_t type,	   /* part of bgp_path_info */
	uint8_t sub_type,  /* part of bgp_path_info */
	uint32_t *label)   /* part of bgp_path_info */
{
	struct agg_table *rt = NULL;
	struct agg_node *rn;
	struct bgp_path_info *info_new;
	struct bgp_path_info *bpi;
	struct bgp_path_info *next;
	char buf[BUFSIZ];

	struct prefix p_firstbpi_old;
	struct prefix p_firstbpi_new;
	int replacing = 0;
	const char *action_str = NULL;
	struct prefix un_prefix;

	struct bgp *bgp;
	bgp = bgp_get_default(); /* assume 1 instance for now */

	switch (action) {
	case FIF_ACTION_UPDATE:
		action_str = "update";
		break;
	case FIF_ACTION_WITHDRAW:
		action_str = "withdraw";
		break;
	case FIF_ACTION_KILL:
		action_str = "kill";
		break;
	default:
		assert(0);
		break;
	}

	vnc_zlog_debug_verbose(
		"%s: entry: %s: prefix %s/%d", __func__, action_str,
		inet_ntop(p->family, &p->u.prefix, buf, sizeof(buf)),
		p->prefixlen);

	memset(&p_firstbpi_old, 0, sizeof(p_firstbpi_old));
	memset(&p_firstbpi_new, 0, sizeof(p_firstbpi_new));

	if (action == FIF_ACTION_UPDATE) {
		/*
		 * Compare rt lists. If no intersection, don't import this route
		 * On a withdraw, peer and RD are sufficient to determine if
		 * we should act.
		 */
		if (!attr || !bgp_attr_get_ecommunity(attr)) {

			vnc_zlog_debug_verbose(
				"%s: attr, extra, or ecommunity missing, not importing",
				__func__);
			return;
		}
#ifdef RFAPI_REQUIRE_ENCAP_BEEC
		if (!rfapiEcommunitiesMatchBeec(
			    bgp_attr_get_ecommunity(attr))) {
			vnc_zlog_debug_verbose(
				"%s: it=%p: no match for BGP Encapsulation ecommunity",
				__func__, import_table);
			return;
		}
#endif
		if (!rfapiEcommunitiesIntersect(
			    import_table->rt_import_list,
			    bgp_attr_get_ecommunity(attr))) {

			vnc_zlog_debug_verbose(
				"%s: it=%p: no ecommunity intersection",
				__func__, import_table);
			return;
		}

		/*
		 * Updates must also have a nexthop address
		 */
		memset(&un_prefix, 0,
		       sizeof(un_prefix)); /* keep valgrind happy */
		if (rfapiGetNexthop(attr, &un_prefix)) {
			vnc_zlog_debug_verbose("%s: missing nexthop address",
					       __func__);
			return;
		}
	}

	/*
	 * Figure out which radix tree the route would go into
	 */
	switch (afi) {
	case AFI_IP:
	case AFI_IP6:
		rt = import_table->imported_encap[afi];
		break;

	case AFI_UNSPEC:
	case AFI_L2VPN:
	case AFI_MAX:
		flog_err(EC_LIB_DEVELOPMENT, "%s: bad afi %d", __func__, afi);
		return;
	}

	/*
	 * agg_node_lookup returns a node only if there is at least
	 * one route attached.
	 */
	rn = agg_node_lookup(rt, p);

#ifdef DEBUG_ENCAP_MONITOR
	vnc_zlog_debug_verbose("%s: initial encap lookup(it=%p) rn=%p",
			       __func__, import_table, rn);
#endif

	if (rn) {

		RFAPI_CHECK_REFCOUNT(rn, SAFI_ENCAP, 1);
		agg_unlock_node(rn); /* undo lock in agg_node_lookup */


		/*
		 * capture nexthop of first bpi
		 */
		if (rn->info) {
			rfapiNexthop2Prefix(
				((struct bgp_path_info *)(rn->info))->attr,
				&p_firstbpi_old);
		}

		for (bpi = rn->info; bpi; bpi = bpi->next) {

			/*
			 * Does this bgp_path_info refer to the same route
			 * as we are trying to add?
			 */
			vnc_zlog_debug_verbose("%s: comparing BPI %p", __func__,
					       bpi);


			/*
			 * Compare RDs
			 *
			 * RD of import table bpi is in
			 * bpi->extra->vnc->vnc.import.rd RD of info_orig is in prd
			 */
			if (!bpi->extra) {
				vnc_zlog_debug_verbose("%s: no bpi->extra",
						       __func__);
				continue;
			}
			if (prefix_cmp((struct prefix *)&bpi->extra->vnc->vnc
					       .import.rd,
				       (struct prefix *)prd)) {
				vnc_zlog_debug_verbose("%s: prd does not match",
						       __func__);
				continue;
			}

			/*
			 * Compare peers
			 */
			if (bpi->peer != peer) {
				vnc_zlog_debug_verbose(
					"%s: peer does not match", __func__);
				continue;
			}

			vnc_zlog_debug_verbose("%s: found matching bpi",
					       __func__);

			/* Same route. Delete this bpi, replace with new one */

			if (action == FIF_ACTION_WITHDRAW) {

				vnc_zlog_debug_verbose(
					"%s: withdrawing at prefix %pRN",
					__func__, rn);

				rfapiBiStartWithdrawTimer(
					import_table, rn, bpi, afi, SAFI_ENCAP,
					rfapiWithdrawTimerEncap);

			} else {
				vnc_zlog_debug_verbose(
					"%s: %s at prefix %pRN", __func__,
					((action == FIF_ACTION_KILL)
						 ? "killing"
						 : "replacing"),
					rn);

				/*
				 * If this route is waiting to be deleted
				 * because of
				 * a previous withdraw, we must cancel its
				 * timer.
				 */
				if (CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED) &&
				    bpi->extra->vnc->vnc.import.timer) {
					struct rfapi_withdraw *wcb = EVENT_ARG(
						bpi->extra->vnc->vnc.import.timer);

					rwcb_del(&_rwcbhash, wcb);
					XFREE(MTYPE_RFAPI_WITHDRAW, wcb);
					EVENT_OFF(bpi->extra->vnc->vnc.import
							  .timer);
				}

				if (action == FIF_ACTION_UPDATE) {
					rfapiBgpInfoDetach(rn, bpi);
					rfapiBgpInfoFree(bpi);
					replacing = 1;
				} else {
					/*
					 * Kill: do export stuff when removing
					 * bpi
					 */
					struct rfapi_withdraw *wcb;
					struct event t;

					/*
					 * pretend we're an expiring timer
					 */
					wcb = XCALLOC(
						MTYPE_RFAPI_WITHDRAW,
						sizeof(struct rfapi_withdraw));
					wcb->info = bpi;
					wcb->node = rn;
					wcb->import_table = import_table;
					rwcb_add(&_rwcbhash, wcb);
					memset(&t, 0, sizeof(t));
					t.arg = wcb;
					rfapiWithdrawTimerEncap(
						&t); /* frees wcb */
				}
			}

			break;
		}
	}

	if (rn)
		RFAPI_CHECK_REFCOUNT(rn, SAFI_ENCAP, replacing ? 1 : 0);

	if (action == FIF_ACTION_WITHDRAW || action == FIF_ACTION_KILL)
		return;

	info_new =
		rfapiBgpInfoCreate(attr, peer, rfd, prd, type, sub_type, NULL);

	if (rn) {
		if (!replacing)
			agg_lock_node(rn); /* incr ref count for new BPI */
	} else {
		rn = agg_node_get(rt, p);
	}

	vnc_zlog_debug_verbose("%s: (afi=%d, rn=%p) inserting at prefix %pRN",
			       __func__, afi, rn, rn);

	rfapiBgpInfoAttachSorted(rn, info_new, afi, SAFI_ENCAP);

	/*
	 * Delete holddown routes from same NVE. See details in
	 * rfapiBgpInfoFilteredImportVPN()
	 */
	for (bpi = info_new->next; bpi; bpi = next) {

		struct prefix pfx_un;
		int un_match = 0;

		next = bpi->next;
		if (!CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED))
			continue;

		/*
		 * We already match the VN address (it is the prefix
		 * of the route node)
		 */

		if (!rfapiGetNexthop(bpi->attr, &pfx_un)
		    && prefix_same(&pfx_un, &un_prefix)) {

			un_match = 1;
		}

		if (!un_match)
			continue;

		vnc_zlog_debug_verbose(
			"%s: removing holddown bpi matching NVE of new route",
			__func__);
		if (bpi->extra->vnc->vnc.import.timer) {
			struct rfapi_withdraw *wcb =
				EVENT_ARG(bpi->extra->vnc->vnc.import.timer);

			rwcb_del(&_rwcbhash, wcb);
			XFREE(MTYPE_RFAPI_WITHDRAW, wcb);
			EVENT_OFF(bpi->extra->vnc->vnc.import.timer);
		}
		rfapiExpireEncapNow(import_table, rn, bpi);
	}

	rfapiNexthop2Prefix(((struct bgp_path_info *)(rn->info))->attr,
			    &p_firstbpi_new);

	/*
	 * If the nexthop address of the selected Encap route (i.e.,
	 * the UN address) has changed, then we must update the VPN
	 * routes that refer to this Encap route and possibly force
	 * rfapi callbacks.
	 */
	if (rfapiAttrNexthopAddrDifferent(&p_firstbpi_old, &p_firstbpi_new)) {

		struct rfapi_monitor_encap *m;
		struct rfapi_monitor_encap *mnext;

		struct agg_node *referenced_vpn_prefix;

		/*
		 * Optimized approach: build radix tree on the fly to
		 * hold list of VPN nodes referenced by the ENCAP monitors
		 *
		 * The nodes in this table correspond to prefixes of VPN routes.
		 * The "info" pointer of the node points to a chain of
		 * struct rfapi_monitor_encap, each of which refers to a
		 * specific VPN node.
		 */
		struct agg_table *referenced_vpn_table;

		referenced_vpn_table = agg_table_init();

/*
 * iterate over the set of monitors at this ENCAP node.
 */
#ifdef DEBUG_ENCAP_MONITOR
		vnc_zlog_debug_verbose("%s: examining monitors at rn=%p",
				       __func__, rn);
#endif
		for (m = RFAPI_MONITOR_ENCAP(rn); m; m = m->next) {
			const struct prefix *pfx;

			/*
			 * For each referenced bpi/route, copy the ENCAP route's
			 * nexthop to the VPN route's cached UN address field
			 * and set
			 * the address family of the cached UN address field.
			 */
			rfapiCopyUnEncap2VPN(info_new, m->bpi);
			if (!CHECK_FLAG(m->bpi->flags, BGP_PATH_VALID)) {
				SET_FLAG(m->bpi->flags, BGP_PATH_VALID);
				if (VALID_INTERIOR_TYPE(m->bpi->type))
					RFAPI_MONITOR_EXTERIOR(m->node)
						->valid_interior_count++;
				vnc_import_bgp_exterior_add_route_interior(
					bgp, import_table, m->node, m->bpi);
			}

			/*
			 * Build a list of unique VPN nodes referenced by these
			 * monitors
			 *
			 * There could be more than one VPN node here with a
			 * given
			 * prefix. Those are currently in an unsorted linear
			 * list
			 * per prefix.
			 */
			pfx = agg_node_get_prefix(m->node);
			referenced_vpn_prefix =
				agg_node_get(referenced_vpn_table, pfx);
			assert(referenced_vpn_prefix);
			for (mnext = referenced_vpn_prefix->info; mnext;
			     mnext = mnext->next) {

				if (mnext->node == m->node)
					break;
			}

			if (mnext) {
				/*
				 * already have an entry for this VPN node
				 */
				agg_unlock_node(referenced_vpn_prefix);
			} else {
				mnext = XCALLOC(
					MTYPE_RFAPI_MONITOR_ENCAP,
					sizeof(struct rfapi_monitor_encap));
				mnext->node = m->node;
				mnext->next = referenced_vpn_prefix->info;
				referenced_vpn_prefix->info = mnext;
			}
		}

		/*
		 * for each VPN node referenced in the ENCAP monitors:
		 */
		for (referenced_vpn_prefix =
			     agg_route_top(referenced_vpn_table);
		     referenced_vpn_prefix;
		     referenced_vpn_prefix =
			     agg_route_next(referenced_vpn_prefix)) {

			while ((m = referenced_vpn_prefix->info)) {

				struct agg_node *n;

				rfapiMonitorMoveLonger(m->node);
				for (n = m->node; n; n = agg_node_parent(n)) {
					// rfapiDoRouteCallback(import_table, n,
					// NULL);
				}
				rfapiMonitorItNodeChanged(import_table, m->node,
							  NULL);

				referenced_vpn_prefix->info = m->next;
				agg_unlock_node(referenced_vpn_prefix);
				XFREE(MTYPE_RFAPI_MONITOR_ENCAP, m);
			}
		}
		agg_table_finish(referenced_vpn_table);
	}

	RFAPI_CHECK_REFCOUNT(rn, SAFI_ENCAP, 0);
}

static void rfapiExpireVpnNow(struct rfapi_import_table *it,
			      struct agg_node *rn, struct bgp_path_info *bpi,
			      int lockoffset)
{
	struct rfapi_withdraw *wcb;
	struct event t;

	/*
	 * pretend we're an expiring timer
	 */
	wcb = XCALLOC(MTYPE_RFAPI_WITHDRAW, sizeof(struct rfapi_withdraw));
	wcb->info = bpi;
	wcb->node = rn;
	wcb->import_table = it;
	wcb->lockoffset = lockoffset;
	rwcb_add(&_rwcbhash, wcb);
	memset(&t, 0, sizeof(t));
	t.arg = wcb;
	rfapiWithdrawTimerVPN(&t); /* frees wcb */
}


/*
 * import a bgp_path_info if its route target list intersects with the
 * import table's route target list
 */
void rfapiBgpInfoFilteredImportVPN(
	struct rfapi_import_table *import_table, int action, struct peer *peer,
	void *rfd, /* set for looped back routes */
	const struct prefix *p,
	const struct prefix *aux_prefix, /* AFI_L2VPN: optional IP */
	afi_t afi, struct prefix_rd *prd,
	struct attr *attr, /* part of bgp_path_info */
	uint8_t type,	   /* part of bgp_path_info */
	uint8_t sub_type,  /* part of bgp_path_info */
	uint32_t *label)   /* part of bgp_path_info */
{
	struct agg_table *rt = NULL;
	struct agg_node *rn;
	struct agg_node *n;
	struct bgp_path_info *info_new;
	struct bgp_path_info *bpi;
	struct bgp_path_info *next;
	char buf[BUFSIZ];
	struct prefix vn_prefix;
	struct prefix un_prefix;
	int un_prefix_valid = 0;
	struct agg_node *ern;
	int replacing = 0;
	int original_had_routes = 0;
	struct prefix original_nexthop;
	const char *action_str = NULL;
	int is_it_ce = 0;

	struct bgp *bgp;
	bgp = bgp_get_default(); /* assume 1 instance for now */

	switch (action) {
	case FIF_ACTION_UPDATE:
		action_str = "update";
		break;
	case FIF_ACTION_WITHDRAW:
		action_str = "withdraw";
		break;
	case FIF_ACTION_KILL:
		action_str = "kill";
		break;
	default:
		assert(0);
		break;
	}

	if (import_table == bgp->rfapi->it_ce)
		is_it_ce = 1;

	vnc_zlog_debug_verbose("%s: entry: %s%s: prefix %s/%d: it %p, afi %s",
			       __func__, (is_it_ce ? "CE-IT " : ""), action_str,
			       rfapi_ntop(p->family, &p->u.prefix, buf, BUFSIZ),
			       p->prefixlen, import_table, afi2str(afi));

	VNC_ITRCCK;

	/*
	 * Compare rt lists. If no intersection, don't import this route
	 * On a withdraw, peer and RD are sufficient to determine if
	 * we should act.
	 */
	if (action == FIF_ACTION_UPDATE) {
		if (!attr || !bgp_attr_get_ecommunity(attr)) {

			vnc_zlog_debug_verbose(
				"%s: attr, extra, or ecommunity missing, not importing",
				__func__);
			return;
		}
		if ((import_table != bgp->rfapi->it_ce) &&
		    !rfapiEcommunitiesIntersect(
			    import_table->rt_import_list,
			    bgp_attr_get_ecommunity(attr))) {

			vnc_zlog_debug_verbose(
				"%s: it=%p: no ecommunity intersection",
				__func__, import_table);
			return;
		}

		memset(&vn_prefix, 0,
		       sizeof(vn_prefix)); /* keep valgrind happy */
		if (rfapiGetNexthop(attr, &vn_prefix)) {
			/* missing nexthop address would be a bad, bad thing */
			vnc_zlog_debug_verbose("%s: missing nexthop", __func__);
			return;
		}
	}

	/*
	 * Figure out which radix tree the route would go into
	 */
	switch (afi) {
	case AFI_IP:
	case AFI_IP6:
	case AFI_L2VPN:
		rt = import_table->imported_vpn[afi];
		break;

	case AFI_UNSPEC:
	case AFI_MAX:
		flog_err(EC_LIB_DEVELOPMENT, "%s: bad afi %d", __func__, afi);
		return;
	}

	/* clear it */
	memset(&original_nexthop, 0, sizeof(original_nexthop));

	/*
	 * agg_node_lookup returns a node only if there is at least
	 * one route attached.
	 */
	rn = agg_node_lookup(rt, p);

	vnc_zlog_debug_verbose("%s: rn=%p", __func__, rn);

	if (rn) {

		RFAPI_CHECK_REFCOUNT(rn, SAFI_MPLS_VPN, 1);
		agg_unlock_node(rn); /* undo lock in agg_node_lookup */

		if (rn->info)
			original_had_routes = 1;

		if (VNC_DEBUG(VERBOSE)) {
			vnc_zlog_debug_verbose("%s: showing IT node on entry",
					       __func__);
			rfapiShowItNode(NULL, rn); /* debug */
		}

		/*
		 * Look for same route (will have same RD and peer)
		 */
		bpi = rfapiItBiIndexSearch(rn, prd, peer, aux_prefix);

		if (bpi) {

			/*
			 * This was an old test when we iterated over the
			 * BPIs linearly. Since we're now looking up with
			 * RD and peer, comparing types should not be
			 * needed. Changed to assertion.
			 *
			 * Compare types. Doing so prevents a RFP-originated
			 * route from matching an imported route, for example.
			 */
			if (VNC_DEBUG(VERBOSE) && bpi->type != type)
				/* should be handled by RDs, but warn for now */
				zlog_warn("%s: type mismatch! (bpi=%d, arg=%d)",
					  __func__, bpi->type, type);

			vnc_zlog_debug_verbose("%s: found matching bpi",
					       __func__);

			/*
			 * In the special CE table, withdrawals occur without
			 * holddown
			 */
			if (import_table == bgp->rfapi->it_ce) {
				vnc_direct_bgp_del_route_ce(bgp, rn, bpi);
				if (action == FIF_ACTION_WITHDRAW)
					action = FIF_ACTION_KILL;
			}

			if (action == FIF_ACTION_WITHDRAW) {

				int washolddown = CHECK_FLAG(bpi->flags,
							     BGP_PATH_REMOVED);

				vnc_zlog_debug_verbose(
					"%s: withdrawing at prefix %pRN%s",
					__func__, rn,
					(washolddown
						 ? " (already being withdrawn)"
						 : ""));

				VNC_ITRCCK;
				if (!washolddown) {
					rfapiBiStartWithdrawTimer(
						import_table, rn, bpi, afi,
						SAFI_MPLS_VPN,
						rfapiWithdrawTimerVPN);

					RFAPI_UPDATE_ITABLE_COUNT(
						bpi, import_table, afi, -1);
					import_table->holddown_count[afi] += 1;
				}
				VNC_ITRCCK;
			} else {
				vnc_zlog_debug_verbose(
					"%s: %s at prefix %pRN", __func__,
					((action == FIF_ACTION_KILL)
						 ? "killing"
						 : "replacing"),
					rn);

				/*
				 * If this route is waiting to be deleted
				 * because of
				 * a previous withdraw, we must cancel its
				 * timer.
				 */
				if (CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED) &&
				    bpi->extra->vnc->vnc.import.timer) {
					struct rfapi_withdraw *wcb = EVENT_ARG(
						bpi->extra->vnc->vnc.import.timer);

					rwcb_del(&_rwcbhash, wcb);
					XFREE(MTYPE_RFAPI_WITHDRAW, wcb);
					EVENT_OFF(bpi->extra->vnc->vnc.import
							  .timer);

					import_table->holddown_count[afi] -= 1;
					RFAPI_UPDATE_ITABLE_COUNT(
						bpi, import_table, afi, 1);
				}
				/*
				 * decrement remote count (if route is remote)
				 * because
				 * we are going to remove it below
				 */
				RFAPI_UPDATE_ITABLE_COUNT(bpi, import_table,
							  afi, -1);
				if (action == FIF_ACTION_UPDATE) {
					replacing = 1;

					/*
					 * make copy of original nexthop so we
					 * can see if it changed
					 */
					rfapiGetNexthop(bpi->attr,
							&original_nexthop);

					/*
					 * remove bpi without doing any export
					 * processing
					 */
					if (CHECK_FLAG(bpi->flags,
						       BGP_PATH_VALID)
					    && VALID_INTERIOR_TYPE(bpi->type))
						RFAPI_MONITOR_EXTERIOR(rn)
							->valid_interior_count--;
					rfapiItBiIndexDel(rn, bpi);
					rfapiBgpInfoDetach(rn, bpi);
					rfapiMonitorEncapDelete(bpi);
					vnc_import_bgp_exterior_del_route_interior(
						bgp, import_table, rn, bpi);
					rfapiBgpInfoFree(bpi);
				} else {
					/* Kill */
					/*
					 * remove bpi and do export processing
					 */
					import_table->holddown_count[afi] += 1;
					rfapiExpireVpnNow(import_table, rn, bpi,
							  0);
				}
			}
		}
	}

	if (rn)
		RFAPI_CHECK_REFCOUNT(rn, SAFI_MPLS_VPN, replacing ? 1 : 0);

	if (action == FIF_ACTION_WITHDRAW || action == FIF_ACTION_KILL) {
		VNC_ITRCCK;
		return;
	}

	info_new =
		rfapiBgpInfoCreate(attr, peer, rfd, prd, type, sub_type, label);

	/*
	 * lookup un address in encap table
	 */
	ern = agg_node_match(import_table->imported_encap[afi], &vn_prefix);
	if (ern) {
		rfapiCopyUnEncap2VPN(ern->info, info_new);
		agg_unlock_node(ern); /* undo lock in route_note_match */
	} else {
		/* Not a big deal, just means VPN route got here first */
		vnc_zlog_debug_verbose("%s: no encap route for vn addr %pFX",
				       __func__, &vn_prefix);
		info_new->extra->vnc->vnc.import.un_family = AF_UNSPEC;
	}

	if (rn) {
		if (!replacing)
			agg_lock_node(rn);
	} else {
		/*
		 * No need to increment reference count, so only "get"
		 * if the node is not there already
		 */
		rn = agg_node_get(rt, p);
	}

	/*
	 * For ethernet routes, if there is an accompanying IP address,
	 * save it in the bpi
	 */
	if ((AFI_L2VPN == afi) && aux_prefix) {

		vnc_zlog_debug_verbose("%s: setting BPI's aux_prefix",
				       __func__);
		info_new->extra->vnc->vnc.import.aux_prefix = *aux_prefix;
	}

	vnc_zlog_debug_verbose("%s: inserting bpi %p at prefix %pRN #%d",
			       __func__, info_new, rn,
			       agg_node_get_lock_count(rn));

	rfapiBgpInfoAttachSorted(rn, info_new, afi, SAFI_MPLS_VPN);
	rfapiItBiIndexAdd(rn, info_new);
	if (!rfapiGetUnAddrOfVpnBi(info_new, NULL)) {
		if (VALID_INTERIOR_TYPE(info_new->type))
			RFAPI_MONITOR_EXTERIOR(rn)->valid_interior_count++;
		SET_FLAG(info_new->flags, BGP_PATH_VALID);
	}
	RFAPI_UPDATE_ITABLE_COUNT(info_new, import_table, afi, 1);
	vnc_import_bgp_exterior_add_route_interior(bgp, import_table, rn,
						   info_new);

	if (import_table == bgp->rfapi->it_ce)
		vnc_direct_bgp_add_route_ce(bgp, rn, info_new);

	if (VNC_DEBUG(VERBOSE)) {
		vnc_zlog_debug_verbose("%s: showing IT node", __func__);
		rfapiShowItNode(NULL, rn); /* debug */
	}

	rfapiMonitorEncapAdd(import_table, &vn_prefix, rn, info_new);

	if (!rfapiGetUnAddrOfVpnBi(info_new, &un_prefix)) {

		/*
		 * if we have a valid UN address (either via Encap route
		 * or via tunnel attribute), then we should attempt
		 * to move any monitors at less-specific nodes to this node
		 */
		rfapiMonitorMoveLonger(rn);

		un_prefix_valid = 1;
	}

	/*
	 * 101129 Enhancement: if we add a route (implication: it is not
	 * in holddown), delete all other routes from this nve at this
	 * node that are in holddown, regardless of peer.
	 *
	 * Reasons it's OK to do that:
	 *
	 * - if the holddown route being deleted originally came from BGP VPN,
	 *   it is already gone from BGP (implication of holddown), so there
	 *   won't be any added inconsistency with the BGP RIB.
	 *
	 * - once a fresh route is added at a prefix, any routes in holddown
	 *   at that prefix will not show up in RFP responses, so deleting
	 *   the holddown routes won't affect the contents of responses.
	 *
	 * - lifetimes are supposed to be consistent, so there should not
	 *   be a case where the fresh route has a shorter lifetime than
	 *   the holddown route, so we don't expect the fresh route to
	 *   disappear and complete its holddown time before the existing
	 *   holddown routes time out. Therefore, we won't have a situation
	 *   where we expect the existing holddown routes to be hidden and
	 *   then  to reappear sometime later (as holddown routes) in a
	 *   RFP response.
	 *
	 * Among other things, this would enable us to skirt the problem
	 * of local holddown routes that refer to NVE descriptors that
	 * have already been closed (if the same NVE triggers a subsequent
	 * rfapi_open(), the new peer is different and doesn't match the
	 * peer of the holddown route, so the stale holddown route still
	 * hangs around until it times out instead of just being replaced
	 * by the fresh route).
	 */
	/*
	 * We know that the new bpi will have been inserted before any routes
	 * in holddown, so we can skip any that came before it
	 */
	for (bpi = info_new->next; bpi; bpi = next) {

		struct prefix pfx_vn;
		struct prefix pfx_un;
		int un_match = 0;
		int remote_peer_match = 0;

		next = bpi->next;

		/*
		 * Must be holddown
		 */
		if (!CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED))
			continue;

		/*
		 * Must match VN address (nexthop of VPN route)
		 */
		if (rfapiGetNexthop(bpi->attr, &pfx_vn))
			continue;
		if (!prefix_same(&pfx_vn, &vn_prefix))
			continue;

		if (un_prefix_valid && /* new route UN addr */
		    !rfapiGetUnAddrOfVpnBi(bpi, &pfx_un)
		    &&					/* old route UN addr */
		    prefix_same(&pfx_un, &un_prefix)) { /* compare */
			un_match = 1;
		}
		if (!RFAPI_LOCAL_BI(bpi) && !RFAPI_LOCAL_BI(info_new) &&
		    sockunion_same(&bpi->peer->connection->su,
				   &info_new->peer->connection->su)) {
			/* old & new are both remote, same peer */
			remote_peer_match = 1;
		}

		if (!un_match && !remote_peer_match)
			continue;

		vnc_zlog_debug_verbose(
			"%s: removing holddown bpi matching NVE of new route",
			__func__);
		if (bpi->extra->vnc->vnc.import.timer) {
			struct rfapi_withdraw *wcb =
				EVENT_ARG(bpi->extra->vnc->vnc.import.timer);

			rwcb_del(&_rwcbhash, wcb);
			XFREE(MTYPE_RFAPI_WITHDRAW, wcb);
			EVENT_OFF(bpi->extra->vnc->vnc.import.timer);
		}
		rfapiExpireVpnNow(import_table, rn, bpi, 0);
	}

	if (!original_had_routes) {
		/*
		 * We went from 0 usable routes to 1 usable route. Perform the
		 * "Adding a Route" export process.
		 */
		vnc_direct_bgp_add_prefix(bgp, import_table, rn);
		vnc_zebra_add_prefix(bgp, import_table, rn);
	} else {
		/*
		 * Check for nexthop change event
		 * Note: the prefix_same() test below detects two situations:
		 * 1. route is replaced, new route has different nexthop
		 * 2. new route is added (original_nexthop is 0)
		 */
		struct prefix new_nexthop;

		rfapiGetNexthop(attr, &new_nexthop);
		if (!prefix_same(&original_nexthop, &new_nexthop)) {
			/*
			 * nexthop change event
			 * vnc_direct_bgp_add_prefix() will recompute VN addr
			 * ecommunity
			 */
			vnc_direct_bgp_add_prefix(bgp, import_table, rn);
		}
	}

	if (!(bgp->rfapi_cfg->flags & BGP_VNC_CONFIG_CALLBACK_DISABLE)) {
		for (n = rn; n; n = agg_node_parent(n)) {
			// rfapiDoRouteCallback(import_table, n, NULL);
		}
		rfapiMonitorItNodeChanged(import_table, rn, NULL);
	}
	RFAPI_CHECK_REFCOUNT(rn, SAFI_MPLS_VPN, 0);
	VNC_ITRCCK;
}

static void rfapiBgpInfoFilteredImportBadSafi(
	struct rfapi_import_table *import_table, int action, struct peer *peer,
	void *rfd, /* set for looped back routes */
	const struct prefix *p,
	const struct prefix *aux_prefix, /* AFI_L2VPN: optional IP */
	afi_t afi, struct prefix_rd *prd,
	struct attr *attr, /* part of bgp_path_info */
	uint8_t type,	   /* part of bgp_path_info */
	uint8_t sub_type,  /* part of bgp_path_info */
	uint32_t *label)   /* part of bgp_path_info */
{
	vnc_zlog_debug_verbose("%s: Error, bad safi", __func__);
}

static rfapi_bi_filtered_import_f *
rfapiBgpInfoFilteredImportFunction(safi_t safi)
{
	switch (safi) {
	case SAFI_MPLS_VPN:
		return rfapiBgpInfoFilteredImportVPN;

	case SAFI_ENCAP:
		return rfapiBgpInfoFilteredImportEncap;

	case SAFI_UNSPEC:
	case SAFI_UNICAST:
	case SAFI_MULTICAST:
	case SAFI_EVPN:
	case SAFI_LABELED_UNICAST:
	case SAFI_FLOWSPEC:
	case SAFI_MAX:
		/* not expected */
		flog_err(EC_LIB_DEVELOPMENT, "%s: bad safi %d", __func__, safi);
		return rfapiBgpInfoFilteredImportBadSafi;
	}

	assert(!"Reached end of function when we were not expecting to");
}

void rfapiProcessUpdate(struct peer *peer,
			void *rfd, /* set when looped from RFP/RFAPI */
			const struct prefix *p, struct prefix_rd *prd,
			struct attr *attr, afi_t afi, safi_t safi, uint8_t type,
			uint8_t sub_type, uint32_t *label)
{
	struct bgp *bgp;
	struct rfapi *h;
	struct rfapi_import_table *it;
	int has_ip_route = 1;
	uint32_t lni = 0;

	bgp = bgp_get_default(); /* assume 1 instance for now */
	assert(bgp);

	h = bgp->rfapi;
	assert(h);

	/*
	 * look at high-order byte of RD. FF means MAC
	 * address is present (VNC L2VPN)
	 */
	if ((safi == SAFI_MPLS_VPN)
	    && (decode_rd_type(prd->val) == RD_TYPE_VNC_ETH)) {
		struct prefix pfx_mac_buf;
		struct prefix pfx_nexthop_buf;
		int rc;

		/*
		 * Set flag if prefix and nexthop are the same - don't
		 * add the route to normal IP-based import tables
		 */
		if (!rfapiGetNexthop(attr, &pfx_nexthop_buf)) {
			if (!prefix_cmp(&pfx_nexthop_buf, p)) {
				has_ip_route = 0;
			}
		}

		memset(&pfx_mac_buf, 0, sizeof(pfx_mac_buf));
		pfx_mac_buf.family = AF_ETHERNET;
		pfx_mac_buf.prefixlen = 48;
		memcpy(&pfx_mac_buf.u.prefix_eth.octet, prd->val + 2, 6);

		/*
		 * Find rt containing LNI (Logical Network ID), which
		 * _should_ always be present when mac address is present
		 */
		rc = rfapiEcommunityGetLNI(bgp_attr_get_ecommunity(attr), &lni);

		vnc_zlog_debug_verbose(
			"%s: rfapiEcommunityGetLNI returned %d, lni=%d, attr=%p",
			__func__, rc, lni, attr);
		if (!rc) {
			it = rfapiMacImportTableGet(bgp, lni);

			rfapiBgpInfoFilteredImportVPN(
				it, FIF_ACTION_UPDATE, peer, rfd,
				&pfx_mac_buf, /* prefix */
				p,	    /* aux prefix: IP addr */
				AFI_L2VPN, prd, attr, type, sub_type, label);
		}
	}

	if (!has_ip_route)
		return;

	/*
	 * Iterate over all import tables; do a filtered import
	 * for the afi/safi combination
	 */
	for (it = h->imports; it; it = it->next) {
		(*rfapiBgpInfoFilteredImportFunction(safi))(
			it, FIF_ACTION_UPDATE, peer, rfd, p, /* prefix */
			NULL, afi, prd, attr, type, sub_type, label);
	}

	if (safi == SAFI_MPLS_VPN) {
		vnc_direct_bgp_rh_add_route(bgp, afi, p, peer, attr);
		rfapiBgpInfoFilteredImportVPN(
			bgp->rfapi->it_ce, FIF_ACTION_UPDATE, peer, rfd,
			p, /* prefix */
			NULL, afi, prd, attr, type, sub_type, label);
	}
}


void rfapiProcessWithdraw(struct peer *peer, void *rfd, const struct prefix *p,
			  struct prefix_rd *prd, struct attr *attr, afi_t afi,
			  safi_t safi, uint8_t type, int kill)
{
	struct bgp *bgp;
	struct rfapi *h;
	struct rfapi_import_table *it;

	bgp = bgp_get_default(); /* assume 1 instance for now */
	assert(bgp);

	h = bgp->rfapi;
	assert(h);

	/*
	 * look at high-order byte of RD. FF means MAC
	 * address is present (VNC L2VPN)
	 */
	if (h->import_mac != NULL && safi == SAFI_MPLS_VPN
	    && decode_rd_type(prd->val) == RD_TYPE_VNC_ETH) {
		struct prefix pfx_mac_buf;
		void *cursor = NULL;
		int rc;

		memset(&pfx_mac_buf, 0, sizeof(pfx_mac_buf));
		pfx_mac_buf.family = AF_ETHERNET;
		pfx_mac_buf.prefixlen = 48;
		memcpy(&pfx_mac_buf.u.prefix_eth, prd->val + 2, 6);

		/*
		 * withdraw does not contain attrs, so we don't have
		 * access to the route's LNI, which would ordinarily
		 * select the specific mac-based import table. Instead,
		 * we must iterate over all mac-based tables and rely
		 * on the RD to match.
		 *
		 * If this approach is too slow, add an index where
		 * key is {RD, peer} and value is the import table
		 */
		for (rc = skiplist_next(h->import_mac, NULL, (void **)&it,
					&cursor);
		     rc == 0; rc = skiplist_next(h->import_mac, NULL,
						 (void **)&it, &cursor)) {

#ifdef DEBUG_L2_EXTRA
			vnc_zlog_debug_verbose(
				"%s: calling rfapiBgpInfoFilteredImportVPN(it=%p, afi=AFI_L2VPN)",
				__func__, it);
#endif

			rfapiBgpInfoFilteredImportVPN(
				it,
				(kill ? FIF_ACTION_KILL : FIF_ACTION_WITHDRAW),
				peer, rfd, &pfx_mac_buf, /* prefix */
				p,			 /* aux_prefix: IP */
				AFI_L2VPN, prd, attr, type, 0,
				NULL); /* sub_type & label unused for withdraw
					  */
		}
	}

	/*
	 * XXX For the case where the withdraw involves an L2
	 * route with no IP information, we rely on the lack
	 * of RT-list intersection to filter out the withdraw
	 * from the IP-based import tables below
	 */

	/*
	 * Iterate over all import tables; do a filtered import
	 * for the afi/safi combination
	 */

	for (it = h->imports; it; it = it->next) {
		(*rfapiBgpInfoFilteredImportFunction(safi))(
			it, (kill ? FIF_ACTION_KILL : FIF_ACTION_WITHDRAW),
			peer, rfd, p, /* prefix */
			NULL, afi, prd, attr, type, 0,
			NULL); /* sub_type & label unused for withdraw */
	}

	/* TBD the deletion should happen after the lifetime expires */
	if (safi == SAFI_MPLS_VPN)
		vnc_direct_bgp_rh_del_route(bgp, afi, p, peer);

	if (safi == SAFI_MPLS_VPN) {
		rfapiBgpInfoFilteredImportVPN(
			bgp->rfapi->it_ce,
			(kill ? FIF_ACTION_KILL : FIF_ACTION_WITHDRAW), peer,
			rfd, p, /* prefix */
			NULL, afi, prd, attr, type, 0,
			NULL); /* sub_type & label unused for withdraw */
	}
}

/*
 * TBD optimized withdraw timer algorithm for case of many
 * routes expiring at the same time due to peer drop.
 */
/*
 * 1. Visit all BPIs in all ENCAP import tables.
 *
 *    a. If a bpi's peer is the failed peer, remove the bpi.
 *	  b. If the removed ENCAP bpi was first in the list of
 *       BPIs at this ENCAP node, loop over all monitors
 *       at this node:
 *
 *       (1) for each ENCAP monitor, loop over all its
 *           VPN node monitors and set their RFAPI_MON_FLAG_NEEDCALLBACK
 *           flags.
 *
 * 2. Visit all BPIs in all VPN import tables.
 *    a. If a bpi's peer is the failed peer, remove the bpi.
 *    b. loop over all the VPN node monitors and set their
 *       RFAPI_MON_FLAG_NEEDCALLBACK flags
 *    c. If there are no BPIs left at this VPN node,
 *
 */


/* surprise, this gets called from peer_delete(), from rfapi_close() */
static void rfapiProcessPeerDownRt(struct peer *peer,
				   struct rfapi_import_table *import_table,
				   afi_t afi, safi_t safi)
{
	struct agg_node *rn;
	struct bgp_path_info *bpi;
	struct agg_table *rt = NULL;
	void (*timer_service_func)(struct event *) = NULL;

	assert(afi == AFI_IP || afi == AFI_IP6);

	VNC_ITRCCK;

	switch (safi) {
	case SAFI_MPLS_VPN:
		rt = import_table->imported_vpn[afi];
		timer_service_func = rfapiWithdrawTimerVPN;
		break;
	case SAFI_ENCAP:
		rt = import_table->imported_encap[afi];
		timer_service_func = rfapiWithdrawTimerEncap;
		break;
	case SAFI_UNSPEC:
	case SAFI_UNICAST:
	case SAFI_MULTICAST:
	case SAFI_EVPN:
	case SAFI_LABELED_UNICAST:
	case SAFI_FLOWSPEC:
	case SAFI_MAX:
		/* Suppress uninitialized variable warning */
		rt = NULL;
		timer_service_func = NULL;
		assert(0);
	}

	for (rn = agg_route_top(rt); rn; rn = agg_route_next(rn)) {
		for (bpi = rn->info; bpi; bpi = bpi->next) {
			if (bpi->peer == peer) {

				if (CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED)) {
					/* already in holddown, skip */
					continue;
				}

				if (safi == SAFI_MPLS_VPN) {
					RFAPI_UPDATE_ITABLE_COUNT(
						bpi, import_table, afi, -1);
					import_table->holddown_count[afi] += 1;
				}
				if (bm->terminating) {
					if (safi == SAFI_MPLS_VPN)
						rfapiExpireVpnNow(import_table, rn, bpi, 1);
					else
						rfapiExpireEncapNow(import_table, rn, bpi);

				} else
					rfapiBiStartWithdrawTimer(import_table, rn, bpi, afi, safi,
								  timer_service_func);
			}
		}
	}
	VNC_ITRCCK;
}

/*
 * This gets called when a peer connection drops. We have to remove
 * all the routes from this peer.
 *
 * Current approach is crude. TBD Optimize by setting fewer timers and
 * grouping withdrawn routes so we can generate callbacks more
 * efficiently.
 */
void rfapiProcessPeerDown(struct peer *peer)
{
	struct bgp *bgp;
	struct rfapi *h;
	struct rfapi_import_table *it;

	/*
	 * If this peer is a "dummy" peer structure atached to a RFAPI
	 * nve_descriptor, we don't need to walk the import tables
	 * because the routes are already withdrawn by rfapi_close()
	 */
	if (CHECK_FLAG(peer->flags, PEER_FLAG_IS_RFAPI_HD))
		return;

	/*
	 * 1. Visit all BPIs in all ENCAP import tables.
	 *    Start withdraw timer on the BPIs that match peer.
	 *
	 * 2. Visit All BPIs in all VPN import tables.
	 *    Start withdraw timer on the BPIs that match peer.
	 */

	bgp = bgp_get_default(); /* assume 1 instance for now */
	if (!bgp)
		return;

	h = bgp->rfapi;
	assert(h);

	for (it = h->imports; it; it = it->next) {
		rfapiProcessPeerDownRt(peer, it, AFI_IP, SAFI_ENCAP);
		rfapiProcessPeerDownRt(peer, it, AFI_IP6, SAFI_ENCAP);
		rfapiProcessPeerDownRt(peer, it, AFI_IP, SAFI_MPLS_VPN);
		rfapiProcessPeerDownRt(peer, it, AFI_IP6, SAFI_MPLS_VPN);
	}

	if (h->it_ce) {
		rfapiProcessPeerDownRt(peer, h->it_ce, AFI_IP, SAFI_MPLS_VPN);
		rfapiProcessPeerDownRt(peer, h->it_ce, AFI_IP6, SAFI_MPLS_VPN);
	}
}

/*
 * Import an entire RIB (for an afi/safi) to an import table RIB,
 * filtered according to the import table's RT list
 *
 * TBD: does this function need additions to match rfapiProcessUpdate()
 * for, e.g., L2 handling?
 */
static void rfapiBgpTableFilteredImport(struct bgp *bgp,
					struct rfapi_import_table *it,
					afi_t afi, safi_t safi)
{
	struct bgp_dest *dest1;
	struct bgp_dest *dest2;

	/* Only these SAFIs have 2-level RIBS */
	assert(safi == SAFI_MPLS_VPN || safi == SAFI_ENCAP);

	/*
	 * Now visit all the rd nodes and the nodes of all the
	 * route tables attached to them, and import the routes
	 * if they have matching route targets
	 */
	for (dest1 = bgp_table_top(bgp->rib[afi][safi]); dest1;
	     dest1 = bgp_route_next(dest1)) {

		if (bgp_dest_has_bgp_path_info_data(dest1)) {

			for (dest2 = bgp_table_top(
				     bgp_dest_get_bgp_table_info(dest1));
			     dest2; dest2 = bgp_route_next(dest2)) {

				struct bgp_path_info *bpi;

				for (bpi = bgp_dest_get_bgp_path_info(dest2);
				     bpi; bpi = bpi->next) {
					uint32_t label = MPLS_INVALID_LABEL;

					if (CHECK_FLAG(bpi->flags,
						       BGP_PATH_REMOVED))
						continue;

					if (BGP_PATH_INFO_NUM_LABELS(bpi))
						label = decode_label(
							&bpi->extra->labels
								 ->label[0]);
					(*rfapiBgpInfoFilteredImportFunction(
						safi))(
						it, /* which import table */
						FIF_ACTION_UPDATE, bpi->peer,
						NULL,
						bgp_dest_get_prefix(dest2),
						NULL, afi,
						(struct prefix_rd *)
							bgp_dest_get_prefix(
								dest1),
						bpi->attr, bpi->type,
						bpi->sub_type, &label);
				}
			}
		}
	}
}


/* per-bgp-instance rfapi data */
struct rfapi *bgp_rfapi_new(struct bgp *bgp)
{
	struct rfapi *h;
	afi_t afi;
	struct rfapi_rfp_cfg *cfg = NULL;
	struct rfapi_rfp_cb_methods *cbm = NULL;

	assert(bgp->rfapi_cfg == NULL);

	h = XCALLOC(MTYPE_RFAPI, sizeof(struct rfapi));

	for (afi = AFI_IP; afi < AFI_MAX; afi++) {
		h->un[afi] = agg_table_init();
	}

	/*
	 * initialize the ce import table
	 */
	h->it_ce = XCALLOC(MTYPE_RFAPI_IMPORTTABLE,
			   sizeof(struct rfapi_import_table));
	h->it_ce->imported_vpn[AFI_IP] = agg_table_init();
	h->it_ce->imported_vpn[AFI_IP6] = agg_table_init();
	h->it_ce->imported_encap[AFI_IP] = agg_table_init();
	h->it_ce->imported_encap[AFI_IP6] = agg_table_init();
	rfapiBgpTableFilteredImport(bgp, h->it_ce, AFI_IP, SAFI_MPLS_VPN);
	rfapiBgpTableFilteredImport(bgp, h->it_ce, AFI_IP6, SAFI_MPLS_VPN);

	/*
	 * Set up work queue for deferred rfapi_close operations
	 */
	h->deferred_close_q =
		work_queue_new(bm->master, "rfapi deferred close");
	h->deferred_close_q->spec.workfunc = rfapi_deferred_close_workfunc;
	h->deferred_close_q->spec.data = h;

	h->rfp = rfp_start(bm->master, &cfg, &cbm);
	bgp->rfapi_cfg = bgp_rfapi_cfg_new(cfg);
	if (cbm != NULL) {
		h->rfp_methods = *cbm;
	}
	return h;
}

void bgp_rfapi_destroy(struct bgp *bgp, struct rfapi *h)
{
	afi_t afi;

	if (bgp == NULL || h == NULL)
		return;

	if (h->resolve_nve_nexthop) {
		skiplist_free(h->resolve_nve_nexthop);
		h->resolve_nve_nexthop = NULL;
	}

	rfapiImportTableFlush(h->it_ce);

	if (h->import_mac) {
		struct rfapi_import_table *it;
		void *cursor;
		int rc;

		for (cursor = NULL,
		    rc = skiplist_next(h->import_mac, NULL, (void **)&it,
				       &cursor);
		     !rc; rc = skiplist_next(h->import_mac, NULL, (void **)&it,
					     &cursor)) {

			rfapiImportTableFlush(it);
			XFREE(MTYPE_RFAPI_IMPORTTABLE, it);
		}
		skiplist_free(h->import_mac);
		h->import_mac = NULL;
	}

	work_queue_free_and_null(&h->deferred_close_q);

	if (h->rfp != NULL)
		rfp_stop(h->rfp);

	for (afi = AFI_IP; afi < AFI_MAX; afi++) {
		agg_table_finish(h->un[afi]);
	}

	XFREE(MTYPE_RFAPI_IMPORTTABLE, h->it_ce);
	XFREE(MTYPE_RFAPI, h);
}

struct rfapi_import_table *
rfapiImportTableRefAdd(struct bgp *bgp, struct ecommunity *rt_import_list,
		       struct rfapi_nve_group_cfg *rfg)
{
	struct rfapi *h;
	struct rfapi_import_table *it;
	afi_t afi;

	h = bgp->rfapi;
	assert(h);

	for (it = h->imports; it; it = it->next) {
		if (ecommunity_cmp(it->rt_import_list, rt_import_list))
			break;
	}

	vnc_zlog_debug_verbose("%s: matched it=%p", __func__, it);

	if (!it) {
		it = XCALLOC(MTYPE_RFAPI_IMPORTTABLE,
			     sizeof(struct rfapi_import_table));
		it->next = h->imports;
		h->imports = it;

		it->rt_import_list = ecommunity_dup(rt_import_list);
		it->rfg = rfg;
		it->monitor_exterior_orphans =
			skiplist_new(0, NULL, prefix_free_lists);

		/*
		 * fill import route tables from RIBs
		 *
		 * Potential area for optimization. If this occurs when
		 * tables are large (e.g., the operator adds a nve group
		 * with a new RT list to a running system), it could take
		 * a while.
		 *
		 */
		for (afi = AFI_IP; afi < AFI_MAX; ++afi) {

			it->imported_vpn[afi] = agg_table_init();
			it->imported_encap[afi] = agg_table_init();

			rfapiBgpTableFilteredImport(bgp, it, afi,
						    SAFI_MPLS_VPN);
			rfapiBgpTableFilteredImport(bgp, it, afi, SAFI_ENCAP);

			vnc_import_bgp_exterior_redist_enable_it(bgp, afi, it);
		}
	}

	it->refcount += 1;

	return it;
}

/*
 * skiplist element free function
 */
static void delete_rem_pfx_na_free(void *na)
{
	uint32_t *pCounter = ((struct rfapi_nve_addr *)na)->info;

	*pCounter += 1;
	XFREE(MTYPE_RFAPI_NVE_ADDR, na);
}

/*
 * Common deleter for IP and MAC import tables
 */
static void rfapiDeleteRemotePrefixesIt(
	struct bgp *bgp, struct rfapi_import_table *it, struct prefix *un,
	struct prefix *vn, struct prefix *p, int delete_active,
	int delete_holddown, uint32_t *pARcount, uint32_t *pAHcount,
	uint32_t *pHRcount, uint32_t *pHHcount,
	struct skiplist *uniq_active_nves, struct skiplist *uniq_holddown_nves)
{
	afi_t afi;

#ifdef DEBUG_L2_EXTRA
	{
		char buf_pfx[PREFIX_STRLEN];

		if (p) {
			prefix2str(p, buf_pfx, sizeof(buf_pfx));
		} else {
			buf_pfx[0] = '*';
			buf_pfx[1] = 0;
		}

		vnc_zlog_debug_verbose(
			"%s: entry, p=%s, delete_active=%d, delete_holddown=%d",
			__func__, buf_pfx, delete_active, delete_holddown);
	}
#endif

	for (afi = AFI_IP; afi < AFI_MAX; ++afi) {

		struct agg_table *rt;
		struct agg_node *rn;

		if (p && (family2afi(p->family) != afi)) {
			continue;
		}

		rt = it->imported_vpn[afi];
		if (!rt)
			continue;

		vnc_zlog_debug_verbose("%s: scanning rt for afi=%d", __func__,
				       afi);

		for (rn = agg_route_top(rt); rn; rn = agg_route_next(rn)) {
			struct bgp_path_info *bpi;
			struct bgp_path_info *next;
			const struct prefix *rn_p = agg_node_get_prefix(rn);

			if (p && VNC_DEBUG(IMPORT_DEL_REMOTE))
				vnc_zlog_debug_any("%s: want %pFX, have %pRN",
						   __func__, p, rn);

			if (p && prefix_cmp(p, rn_p))
				continue;

			vnc_zlog_debug_verbose("%s: rn pfx=%pRN", __func__, rn);

			/* TBD is this valid for afi == AFI_L2VPN? */
			RFAPI_CHECK_REFCOUNT(rn, SAFI_MPLS_VPN, 1);

			for (bpi = rn->info; bpi; bpi = next) {
				next = bpi->next;

				struct prefix qpt;
				struct prefix qct;
				int qpt_valid = 0;
				int qct_valid = 0;
				int is_active = 0;

				vnc_zlog_debug_verbose("%s: examining bpi %p",
						       __func__, bpi);

				if (!rfapiGetNexthop(bpi->attr, &qpt))
					qpt_valid = 1;

				if (vn) {
					if (!qpt_valid
					    || !prefix_match(vn, &qpt)) {
#ifdef DEBUG_L2_EXTRA
						vnc_zlog_debug_verbose(
							"%s: continue at vn && !qpt_valid || !prefix_match(vn, &qpt)",
							__func__);
#endif
						continue;
					}
				}

				if (!rfapiGetUnAddrOfVpnBi(bpi, &qct))
					qct_valid = 1;

				if (un) {
					if (!qct_valid
					    || !prefix_match(un, &qct)) {
#ifdef DEBUG_L2_EXTRA
						vnc_zlog_debug_verbose(
							"%s: continue at un && !qct_valid || !prefix_match(un, &qct)",
							__func__);
#endif
						continue;
					}
				}


				/*
				 * Blow bpi away
				 */
				/*
				 * If this route is waiting to be deleted
				 * because of
				 * a previous withdraw, we must cancel its
				 * timer.
				 */
				if (CHECK_FLAG(bpi->flags, BGP_PATH_REMOVED)) {
					if (!delete_holddown)
						continue;
					if (bpi->extra->vnc->vnc.import.timer) {
						struct rfapi_withdraw *wcb = EVENT_ARG(
							bpi->extra->vnc->vnc
								.import.timer);

						wcb->import_table
							->holddown_count[afi] -=
							1;
						RFAPI_UPDATE_ITABLE_COUNT(
							bpi, wcb->import_table,
							afi, 1);
						rwcb_del(&_rwcbhash, wcb);
						XFREE(MTYPE_RFAPI_WITHDRAW,
						      wcb);
						EVENT_OFF(bpi->extra->vnc->vnc
								  .import.timer);
					}
				} else {
					if (!delete_active)
						continue;
					is_active = 1;
				}

				vnc_zlog_debug_verbose(
					"%s: deleting bpi %p (qct_valid=%d, qpt_valid=%d, delete_holddown=%d, delete_active=%d)",
					__func__, bpi, qct_valid, qpt_valid,
					delete_holddown, delete_active);


				/*
				 * add nve to list
				 */
				if (qct_valid && qpt_valid) {

					struct rfapi_nve_addr na;
					struct rfapi_nve_addr *nap;

					memset(&na, 0, sizeof(na));
					assert(!rfapiQprefix2Raddr(&qct,
								   &na.un));
					assert(!rfapiQprefix2Raddr(&qpt,
								   &na.vn));

					if (skiplist_search(
						    (is_active
							     ? uniq_active_nves
							     : uniq_holddown_nves),
						    &na, (void **)&nap)) {
						char line[BUFSIZ];

						nap = XCALLOC(
							MTYPE_RFAPI_NVE_ADDR,
							sizeof(struct
							       rfapi_nve_addr));
						*nap = na;
						nap->info = is_active
								    ? pAHcount
								    : pHHcount;
						skiplist_insert(
							(is_active
								 ? uniq_active_nves
								 : uniq_holddown_nves),
							nap, nap);

						rfapiNveAddr2Str(nap, line,
								 BUFSIZ);
					}
				}

				vnc_direct_bgp_rh_del_route(bgp, afi, rn_p,
							    bpi->peer);

				RFAPI_UPDATE_ITABLE_COUNT(bpi, it, afi, -1);
				it->holddown_count[afi] += 1;
				rfapiExpireVpnNow(it, rn, bpi, 1);

				vnc_zlog_debug_verbose(
					"%s: incrementing count (is_active=%d)",
					__func__, is_active);

				if (is_active)
					++*pARcount;
				else
					++*pHRcount;
			}
		}
	}
}


/*
 * For use by the "clear vnc prefixes" command
 */
/*------------------------------------------
 * rfapiDeleteRemotePrefixes
 *
 * UI helper: For use by the "clear vnc prefixes" command
 *
 * input:
 *	un			if set, tunnel must match this prefix
 *	vn			if set, nexthop prefix must match this prefix
 *	p			if set, prefix must match this prefix
 *      it                      if set, only look in this import table
 *
 * output
 *	pARcount		number of active routes deleted
 *	pAHcount		number of active nves deleted
 *	pHRcount		number of holddown routes deleted
 *	pHHcount		number of holddown nves deleted
 *
 * return value:
 *	void
 --------------------------------------------*/
void rfapiDeleteRemotePrefixes(struct prefix *un, struct prefix *vn,
			       struct prefix *p,
			       struct rfapi_import_table *arg_it,
			       int delete_active, int delete_holddown,
			       uint32_t *pARcount, uint32_t *pAHcount,
			       uint32_t *pHRcount, uint32_t *pHHcount)
{
	struct bgp *bgp;
	struct rfapi *h;
	struct rfapi_import_table *it;
	uint32_t deleted_holddown_route_count = 0;
	uint32_t deleted_active_route_count = 0;
	uint32_t deleted_holddown_nve_count = 0;
	uint32_t deleted_active_nve_count = 0;
	struct skiplist *uniq_holddown_nves;
	struct skiplist *uniq_active_nves;

	VNC_ITRCCK;

	bgp = bgp_get_default(); /* assume 1 instance for now */
	/* If no bgp instantiated yet, no vnc prefixes exist */
	if (!bgp)
		return;

	h = bgp->rfapi;
	assert(h);

	uniq_holddown_nves =
		skiplist_new(0, rfapi_nve_addr_cmp, delete_rem_pfx_na_free);
	uniq_active_nves =
		skiplist_new(0, rfapi_nve_addr_cmp, delete_rem_pfx_na_free);

	/*
	 * Iterate over all import tables; do a filtered import
	 * for the afi/safi combination
	 */

	if (arg_it)
		it = arg_it;
	else
		it = h->imports;
	for (; it;) {

		vnc_zlog_debug_verbose(
			"%s: calling rfapiDeleteRemotePrefixesIt() on (IP) import %p",
			__func__, it);

		rfapiDeleteRemotePrefixesIt(
			bgp, it, un, vn, p, delete_active, delete_holddown,
			&deleted_active_route_count, &deleted_active_nve_count,
			&deleted_holddown_route_count,
			&deleted_holddown_nve_count, uniq_active_nves,
			uniq_holddown_nves);

		if (arg_it)
			it = NULL;
		else
			it = it->next;
	}

	/*
	 * Now iterate over L2 import tables
	 */
	if (h->import_mac && !(p && (p->family != AF_ETHERNET))) {

		void *cursor = NULL;
		int rc;

		for (cursor = NULL,
		    rc = skiplist_next(h->import_mac, NULL, (void **)&it,
				       &cursor);
		     !rc; rc = skiplist_next(h->import_mac, NULL, (void **)&it,
					     &cursor)) {

			vnc_zlog_debug_verbose(
				"%s: calling rfapiDeleteRemotePrefixesIt() on import_mac %p",
				__func__, it);

			rfapiDeleteRemotePrefixesIt(
				bgp, it, un, vn, p, delete_active,
				delete_holddown, &deleted_active_route_count,
				&deleted_active_nve_count,
				&deleted_holddown_route_count,
				&deleted_holddown_nve_count, uniq_active_nves,
				uniq_holddown_nves);
		}
	}

	/*
	 * our custom element freeing function above counts as it deletes
	 */
	skiplist_free(uniq_holddown_nves);
	skiplist_free(uniq_active_nves);

	if (pARcount)
		*pARcount = deleted_active_route_count;
	if (pAHcount)
		*pAHcount = deleted_active_nve_count;
	if (pHRcount)
		*pHRcount = deleted_holddown_route_count;
	if (pHHcount)
		*pHHcount = deleted_holddown_nve_count;

	VNC_ITRCCK;
}

/*------------------------------------------
 * rfapiCountRemoteRoutes
 *
 * UI helper: count VRF routes from BGP side
 *
 * input:
 *
 * output
 *	pALRcount		count of active local routes
 *	pARRcount		count of active remote routes
 *	pHRcount		count of holddown routes
 *	pIRcount		count of direct imported routes
 *
 * return value:
 *	void
 --------------------------------------------*/
void rfapiCountAllItRoutes(int *pALRcount, /* active local routes */
			   int *pARRcount, /* active remote routes */
			   int *pHRcount,  /* holddown routes */
			   int *pIRcount)  /* imported routes */
{
	struct bgp *bgp;
	struct rfapi *h;
	struct rfapi_import_table *it;
	afi_t afi;

	int total_active_local = 0;
	int total_active_remote = 0;
	int total_holddown = 0;
	int total_imported = 0;

	bgp = bgp_get_default(); /* assume 1 instance for now */
	assert(bgp);

	h = bgp->rfapi;
	assert(h);

	/*
	 * Iterate over all import tables; do a filtered import
	 * for the afi/safi combination
	 */

	for (it = h->imports; it; it = it->next) {

		for (afi = AFI_IP; afi < AFI_MAX; ++afi) {

			total_active_local += it->local_count[afi];
			total_active_remote += it->remote_count[afi];
			total_holddown += it->holddown_count[afi];
			total_imported += it->imported_count[afi];
		}
	}

	void *cursor;
	int rc;

	if (h->import_mac) {
		for (cursor = NULL,
		    rc = skiplist_next(h->import_mac, NULL, (void **)&it,
				       &cursor);
		     !rc; rc = skiplist_next(h->import_mac, NULL, (void **)&it,
					     &cursor)) {

			total_active_local += it->local_count[AFI_L2VPN];
			total_active_remote += it->remote_count[AFI_L2VPN];
			total_holddown += it->holddown_count[AFI_L2VPN];
			total_imported += it->imported_count[AFI_L2VPN];
		}
	}


	if (pALRcount) {
		*pALRcount = total_active_local;
	}
	if (pARRcount) {
		*pARRcount = total_active_remote;
	}
	if (pHRcount) {
		*pHRcount = total_holddown;
	}
	if (pIRcount) {
		*pIRcount = total_imported;
	}
}

/*------------------------------------------
 * rfapiGetHolddownFromLifetime
 *
 * calculate holddown value based on lifetime
 *
 * input:
 *     lifetime                lifetime
 *
 * return value:
 *     Holddown value based on lifetime, holddown_factor,
 *     and RFAPI_LIFETIME_INFINITE_WITHDRAW_DELAY
 *
 --------------------------------------------*/
/* hold down time maxes out at RFAPI_LIFETIME_INFINITE_WITHDRAW_DELAY */
uint32_t rfapiGetHolddownFromLifetime(uint32_t lifetime)
{
	uint32_t factor;
	struct bgp *bgp;

	bgp = bgp_get_default();
	if (bgp && bgp->rfapi_cfg)
		factor = bgp->rfapi_cfg->rfp_cfg.holddown_factor;
	else
		factor = RFAPI_RFP_CFG_DEFAULT_HOLDDOWN_FACTOR;

	if (factor < 100 || lifetime < RFAPI_LIFETIME_INFINITE_WITHDRAW_DELAY)
		lifetime = lifetime * factor / 100;
	if (lifetime < RFAPI_LIFETIME_INFINITE_WITHDRAW_DELAY)
		return lifetime;
	else
		return RFAPI_LIFETIME_INFINITE_WITHDRAW_DELAY;
}

void rfapi_import_init(void)
{
	rwcb_init(&_rwcbhash);
}

void rfapi_import_terminate(void)
{
	struct rfapi_withdraw *wcb;
	struct bgp_path_info *bpi;
	void (*timer_service_func)(struct event *t);
	struct event t;

	vnc_zlog_debug_verbose("%s: cleaning up %zu pending timers", __func__,
			       rwcb_count(&_rwcbhash));

	/*
	 * clean up memory allocations stored in pending timers
	 */
	while ((wcb = rwcb_pop(&_rwcbhash))) {
		bpi = wcb->info;
		assert(wcb == EVENT_ARG(bpi->extra->vnc->vnc.import.timer));
		EVENT_OFF(bpi->extra->vnc->vnc.import.timer);

		timer_service_func = wcb->timer_service_func;
		memset(&t, 0, sizeof(t));
		t.arg = wcb;
		(*timer_service_func)(&t); /* frees wcb */
	}
}