[mirror_frr.git] / nhrpd / nhrp_route.c

/* NHRP routing functions
 * Copyright (c) 2014-2015 Timo Teräs
 *
 * This file is free software: you may copy, redistribute and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 */

#include "nhrpd.h"
#include "table.h"
#include "memory.h"
#include "stream.h"
#include "log.h"
#include "zclient.h"

DEFINE_MTYPE_STATIC(NHRPD, NHRP_ROUTE, "NHRP routing entry")

static struct zclient *zclient;
static struct route_table *zebra_rib[AFI_MAX];

struct route_info {
	union sockunion via;
	struct interface *ifp;
	struct interface *nhrp_ifp;
};

static struct route_node *nhrp_route_update_get(const struct prefix *p, int create)
{
	struct route_node *rn;
	afi_t afi = family2afi(PREFIX_FAMILY(p));

	if (!zebra_rib[afi])
		return NULL;

	if (create) {
		rn = route_node_get(zebra_rib[afi], p);
		if (!rn->info) {
			rn->info = XCALLOC(MTYPE_NHRP_ROUTE, sizeof(struct route_info));
			route_lock_node(rn);
		}
		return rn;
	} else {
		return route_node_lookup(zebra_rib[afi], p);
	}
}

static void nhrp_route_update_put(struct route_node *rn)
{
	struct route_info *ri = rn->info;

	if (!ri->ifp && !ri->nhrp_ifp && sockunion_family(&ri->via) == AF_UNSPEC) {
		XFREE(MTYPE_NHRP_ROUTE, rn->info);
		rn->info = NULL;
		route_unlock_node(rn);
	}
	route_unlock_node(rn);
}

static void nhrp_route_update_zebra(const struct prefix *p, union sockunion *nexthop, struct interface *ifp)
{
	struct route_node *rn;
	struct route_info *ri;

	rn = nhrp_route_update_get(p, (sockunion_family(nexthop) != AF_UNSPEC) || ifp);
	if (rn) {
		ri = rn->info;
		ri->via = *nexthop;
		ri->ifp = ifp;
		nhrp_route_update_put(rn);
	}
}

void nhrp_route_update_nhrp(const struct prefix *p, struct interface *ifp)
{
	struct route_node *rn;
	struct route_info *ri;

	rn = nhrp_route_update_get(p, ifp != NULL);
	if (rn) {
		ri = rn->info;
		ri->nhrp_ifp = ifp;
		nhrp_route_update_put(rn);
	}
}

void nhrp_route_announce(int add, enum nhrp_cache_type type, const struct prefix *p, struct interface *ifp, const union sockunion *nexthop, uint32_t mtu)
{
	struct zapi_route api;
	struct zapi_nexthop *api_nh;

	if (zclient->sock < 0)
		return;

	memset(&api, 0, sizeof(api));
	api.type = ZEBRA_ROUTE_NHRP;
	api.safi = SAFI_UNICAST;
	api.vrf_id = VRF_DEFAULT;
	api.prefix = *p;

	switch (type) {
	case NHRP_CACHE_NEGATIVE:
		zapi_route_set_blackhole(&api, BLACKHOLE_REJECT);
		ifp = NULL;
		nexthop = NULL;
		break;
	case NHRP_CACHE_DYNAMIC:
	case NHRP_CACHE_NHS:
	case NHRP_CACHE_STATIC:
		/* Regular route, so these are announced
		 * to other routing daemons */
		break;
	default:
		SET_FLAG(api.flags, ZEBRA_FLAG_FIB_OVERRIDE);
		break;
	}
	SET_FLAG(api.flags, ZEBRA_FLAG_ALLOW_RECURSION);

	SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
	api.nexthop_num = 1;
	api_nh = &api.nexthops[0];
	api_nh->vrf_id = VRF_DEFAULT;

	switch (api.prefix.family) {
	case AF_INET:
		if (nexthop) {
			api_nh->gate.ipv4 = nexthop->sin.sin_addr;
			api_nh->type = NEXTHOP_TYPE_IPV4;
		}
		if (ifp) {
			api_nh->ifindex = ifp->ifindex;
			if (api_nh->type == NEXTHOP_TYPE_IPV4)
				api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
			else
				api_nh->type = NEXTHOP_TYPE_IFINDEX;
		}
		break;
	case AF_INET6:
		if (nexthop) {
			api_nh->gate.ipv6 = nexthop->sin6.sin6_addr;
			api_nh->type = NEXTHOP_TYPE_IPV6;
		}
		if (ifp) {
			api_nh->ifindex = ifp->ifindex;
			if (api_nh->type == NEXTHOP_TYPE_IPV6)
				api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX;
			else
				api_nh->type = NEXTHOP_TYPE_IFINDEX;
		}
		break;
	}
	if (mtu) {
		SET_FLAG(api.message, ZAPI_MESSAGE_MTU);
		api.mtu = mtu;
	}

	if (unlikely(debug_flags & NHRP_DEBUG_ROUTE)) {
		char buf[2][PREFIX_STRLEN];

		prefix2str(&api.prefix, buf[0], sizeof(buf[0]));
		zlog_debug("Zebra send: route %s %s nexthop %s metric %u"
			" count %d dev %s",
			add ? "add" : "del", buf[0],
			nexthop ? inet_ntop(api.prefix.family, &api_nh->gate, buf[1], sizeof(buf[1])) : "<onlink>",
			api.metric, api.nexthop_num, ifp ? ifp->name : "none");
	}

	zclient_route_send(add ? ZEBRA_ROUTE_ADD : ZEBRA_ROUTE_DELETE, zclient,
			   &api);
}

int nhrp_route_read(int cmd, struct zclient *zclient, zebra_size_t length, vrf_id_t vrf_id)
{
	struct zapi_route api;
	struct zapi_nexthop *api_nh;
	struct interface *ifp = NULL;
	union sockunion nexthop_addr;
	char buf[2][PREFIX_STRLEN];
	int added;

	if (zapi_route_decode(zclient->ibuf, &api) < 0)
		return -1;

	/* we completely ignore srcdest routes for now. */
	if (CHECK_FLAG(api.message, ZAPI_MESSAGE_SRCPFX))
		return 0;

	sockunion_family(&nexthop_addr) = AF_UNSPEC;
	if (CHECK_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP)) {
		api_nh = &api.nexthops[0];

		nexthop_addr.sa.sa_family = api.prefix.family;
		switch (nexthop_addr.sa.sa_family) {
		case AF_INET:
			nexthop_addr.sin.sin_addr = api_nh->gate.ipv4;
			break;
		case AF_INET6:
			nexthop_addr.sin6.sin6_addr = api_nh->gate.ipv6;
			break;
		}

		if (api_nh->ifindex != IFINDEX_INTERNAL)
                       	ifp = if_lookup_by_index(api_nh->ifindex, VRF_DEFAULT);
	}

	added = (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD);
	debugf(NHRP_DEBUG_ROUTE, "if-route-%s: %s via %s dev %s",
		added ? "add" : "del",
		prefix2str(&api.prefix, buf[0], sizeof buf[0]),
		sockunion2str(&nexthop_addr, buf[1], sizeof buf[1]),
		ifp ? ifp->name : "(none)");

	nhrp_route_update_zebra(&api.prefix, &nexthop_addr, ifp);
	nhrp_shortcut_prefix_change(&api.prefix, !added);

	return 0;
}

int nhrp_route_get_nexthop(const union sockunion *addr, struct prefix *p, union sockunion *via, struct interface **ifp)
{
	struct route_node *rn;
	struct route_info *ri;
	struct prefix lookup;
	afi_t afi = family2afi(sockunion_family(addr));
	char buf[PREFIX_STRLEN];

	sockunion2hostprefix(addr, &lookup);

	rn = route_node_match(zebra_rib[afi], &lookup);
	if (!rn) return 0;

	ri = rn->info;
	if (ri->nhrp_ifp) {
		debugf(NHRP_DEBUG_ROUTE, "lookup %s: nhrp_if=%s",
			prefix2str(&lookup, buf, sizeof buf),
			ri->nhrp_ifp->name);

		if (via) sockunion_family(via) = AF_UNSPEC;
		if (ifp) *ifp = ri->nhrp_ifp;
	} else {
		debugf(NHRP_DEBUG_ROUTE, "lookup %s: zebra route dev %s",
			prefix2str(&lookup, buf, sizeof buf),
			ri->ifp ? ri->ifp->name : "(none)");

		if (via) *via = ri->via;
		if (ifp) *ifp = ri->ifp;
	}
	if (p) *p = rn->p;
	route_unlock_node(rn);
	return 1;
}

enum nhrp_route_type nhrp_route_address(struct interface *in_ifp, union sockunion *addr, struct prefix *p, struct nhrp_peer **peer)
{
	struct interface *ifp = in_ifp;
	struct nhrp_interface *nifp;
	struct nhrp_cache *c;
	union sockunion via[4];
	uint32_t network_id = 0;
	afi_t afi = family2afi(sockunion_family(addr));
	int i;

	if (ifp) {
		nifp = ifp->info;
		network_id = nifp->afi[afi].network_id;

		c = nhrp_cache_get(ifp, addr, 0);
		if (c && c->cur.type == NHRP_CACHE_LOCAL) {
			if (p) memset(p, 0, sizeof(*p));
			return NHRP_ROUTE_LOCAL;
		}
	}

	for (i = 0; i < 4; i++) {
		if (!nhrp_route_get_nexthop(addr, p, &via[i], &ifp))
			return NHRP_ROUTE_BLACKHOLE;
		if (ifp) {
			/* Departing from nbma network? */
			nifp = ifp->info;
			if (network_id && network_id != nifp->afi[afi].network_id)
				return NHRP_ROUTE_OFF_NBMA;
		}
		if (sockunion_family(&via[i]) == AF_UNSPEC)
			break;
		/* Resolve via node, but return the prefix of first match */
		addr = &via[i];
		p = NULL;
	}

	if (ifp) {
		c = nhrp_cache_get(ifp, addr, 0);
		if (c && c->cur.type >= NHRP_CACHE_DYNAMIC) {
			if (p) memset(p, 0, sizeof(*p));
			if (c->cur.type == NHRP_CACHE_LOCAL)
				return NHRP_ROUTE_LOCAL;
			if (peer) *peer = nhrp_peer_ref(c->cur.peer);
			return NHRP_ROUTE_NBMA_NEXTHOP;
		}
	}

	return NHRP_ROUTE_BLACKHOLE;
}

static void
nhrp_zebra_connected (struct zclient *zclient)
{
	zclient_send_reg_requests(zclient, VRF_DEFAULT);
	zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP,
	    ZEBRA_ROUTE_ALL, 0, VRF_DEFAULT);
	zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP6,
	    ZEBRA_ROUTE_ALL, 0, VRF_DEFAULT);
}

void nhrp_zebra_init(void)
{
	zebra_rib[AFI_IP] = route_table_init();
	zebra_rib[AFI_IP6] = route_table_init();

	zclient = zclient_new_notify(master, &zclient_options_default);
	zclient->zebra_connected = nhrp_zebra_connected;
	zclient->interface_add = nhrp_interface_add;
	zclient->interface_delete = nhrp_interface_delete;
	zclient->interface_up = nhrp_interface_up;
	zclient->interface_down = nhrp_interface_down;
	zclient->interface_address_add = nhrp_interface_address_add;
	zclient->interface_address_delete = nhrp_interface_address_delete;
	zclient->redistribute_route_add = nhrp_route_read;
	zclient->redistribute_route_del = nhrp_route_read;

	zclient_init(zclient, ZEBRA_ROUTE_NHRP, 0, &nhrpd_privs);
}

void nhrp_zebra_terminate(void)
{
	zclient_stop(zclient);
	zclient_free(zclient);
	route_table_finish(zebra_rib[AFI_IP]);
	route_table_finish(zebra_rib[AFI_IP6]);
}
Commit	Line	Data
2fb975da TT	1	/* NHRP routing functions
	2	* Copyright (c) 2014-2015 Timo Teräs
	3	*
	4	* This file is free software: you may copy, redistribute and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation, either version 2 of the License, or
	7	* (at your option) any later version.
	8	*/
	9
	10	#include "nhrpd.h"
	11	#include "table.h"
	12	#include "memory.h"
	13	#include "stream.h"
	14	#include "log.h"
	15	#include "zclient.h"
	16
819dc8bb DL	17	DEFINE_MTYPE_STATIC(NHRPD, NHRP_ROUTE, "NHRP routing entry")
819dc8bb DL	18
2fb975da TT	19	static struct zclient *zclient;
	20	static struct route_table *zebra_rib[AFI_MAX];
	21
	22	struct route_info {
	23	union sockunion via;
	24	struct interface *ifp;
	25	struct interface *nhrp_ifp;
	26	};
	27
2fb975da TT	28	static struct route_node nhrp_route_update_get(const struct prefix p, int create)
	29	{
	30	struct route_node *rn;
	31	afi_t afi = family2afi(PREFIX_FAMILY(p));
	32
	33	if (!zebra_rib[afi])
	34	return NULL;
	35
	36	if (create) {
	37	rn = route_node_get(zebra_rib[afi], p);
	38	if (!rn->info) {
	39	rn->info = XCALLOC(MTYPE_NHRP_ROUTE, sizeof(struct route_info));
	40	route_lock_node(rn);
	41	}
	42	return rn;
	43	} else {
	44	return route_node_lookup(zebra_rib[afi], p);
	45	}
	46	}
	47
	48	static void nhrp_route_update_put(struct route_node *rn)
	49	{
	50	struct route_info *ri = rn->info;
	51
	52	if (!ri->ifp && !ri->nhrp_ifp && sockunion_family(&ri->via) == AF_UNSPEC) {
	53	XFREE(MTYPE_NHRP_ROUTE, rn->info);
	54	rn->info = NULL;
	55	route_unlock_node(rn);
	56	}
	57	route_unlock_node(rn);
	58	}
	59
	60	static void nhrp_route_update_zebra(const struct prefix p, union sockunion nexthop, struct interface *ifp)
	61	{
	62	struct route_node *rn;
	63	struct route_info *ri;
	64
	65	rn = nhrp_route_update_get(p, (sockunion_family(nexthop) != AF_UNSPEC) \|\| ifp);
	66	if (rn) {
	67	ri = rn->info;
	68	ri->via = *nexthop;
	69	ri->ifp = ifp;
	70	nhrp_route_update_put(rn);
	71	}
	72	}
	73
	74	void nhrp_route_update_nhrp(const struct prefix p, struct interface ifp)
	75	{
	76	struct route_node *rn;
	77	struct route_info *ri;
	78
	79	rn = nhrp_route_update_get(p, ifp != NULL);
	80	if (rn) {
	81	ri = rn->info;
	82	ri->nhrp_ifp = ifp;
	83	nhrp_route_update_put(rn);
	84	}
	85	}
	86
	87	void nhrp_route_announce(int add, enum nhrp_cache_type type, const struct prefix p, struct interface ifp, const union sockunion *nexthop, uint32_t mtu)
	88	{
9350687d RW	89	struct zapi_route api;
9350687d RW	90	struct zapi_nexthop *api_nh;
2fb975da TT	91
	92	if (zclient->sock < 0)
	93	return;
	94
9350687d RW	95	memset(&api, 0, sizeof(api));
	96	api.type = ZEBRA_ROUTE_NHRP;
	97	api.safi = SAFI_UNICAST;
d5b2119c	98	api.vrf_id = VRF_DEFAULT;
9350687d RW	99	api.prefix = *p;
9350687d RW	100
2fb975da TT	101	switch (type) {
2fb975da TT	102	case NHRP_CACHE_NEGATIVE:
09a484dd DL	103	zapi_route_set_blackhole(&api, BLACKHOLE_REJECT);
	104	ifp = NULL;
	105	nexthop = NULL;
2fb975da TT	106	break;
	107	case NHRP_CACHE_DYNAMIC:
	108	case NHRP_CACHE_NHS:
	109	case NHRP_CACHE_STATIC:
	110	/* Regular route, so these are announced
	111	* to other routing daemons */
	112	break;
	113	default:
9350687d	114	SET_FLAG(api.flags, ZEBRA_FLAG_FIB_OVERRIDE);
2fb975da TT	115	break;
2fb975da TT	116	}
4e8b02f4	117	SET_FLAG(api.flags, ZEBRA_FLAG_ALLOW_RECURSION);
2fb975da	118
9350687d RW	119	SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
	120	api.nexthop_num = 1;
	121	api_nh = &api.nexthops[0];
4a7371e9	122	api_nh->vrf_id = VRF_DEFAULT;
2fb975da	123
9350687d RW	124	switch (api.prefix.family) {
9350687d RW	125	case AF_INET:
2fb975da	126	if (nexthop) {
6f27a9f6 RW	127	api_nh->gate.ipv4 = nexthop->sin.sin_addr;
6f27a9f6 RW	128	api_nh->type = NEXTHOP_TYPE_IPV4;
2fb975da TT	129	}
2fb975da TT	130	if (ifp) {
6f27a9f6 RW	131	api_nh->ifindex = ifp->ifindex;
	132	if (api_nh->type == NEXTHOP_TYPE_IPV4)
	133	api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
	134	else
	135	api_nh->type = NEXTHOP_TYPE_IFINDEX;
2fb975da	136	}
9350687d RW	137	break;
9350687d RW	138	case AF_INET6:
37dc8ab5	139	if (nexthop) {
6f27a9f6 RW	140	api_nh->gate.ipv6 = nexthop->sin6.sin6_addr;
6f27a9f6 RW	141	api_nh->type = NEXTHOP_TYPE_IPV6;
37dc8ab5 TT	142	}
37dc8ab5 TT	143	if (ifp) {
6f27a9f6 RW	144	api_nh->ifindex = ifp->ifindex;
	145	if (api_nh->type == NEXTHOP_TYPE_IPV6)
	146	api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX;
	147	else
	148	api_nh->type = NEXTHOP_TYPE_IFINDEX;
37dc8ab5	149	}
9350687d RW	150	break;
	151	}
	152	if (mtu) {
	153	SET_FLAG(api.message, ZAPI_MESSAGE_MTU);
	154	api.mtu = mtu;
	155	}
37dc8ab5	156
9350687d RW	157	if (unlikely(debug_flags & NHRP_DEBUG_ROUTE)) {
9350687d RW	158	char buf[2][PREFIX_STRLEN];
37dc8ab5	159
9350687d RW	160	prefix2str(&api.prefix, buf[0], sizeof(buf[0]));
	161	zlog_debug("Zebra send: route %s %s nexthop %s metric %u"
	162	" count %d dev %s",
	163	add ? "add" : "del", buf[0],
	164	nexthop ? inet_ntop(api.prefix.family, &api_nh->gate, buf[1], sizeof(buf[1])) : "<onlink>",
09a484dd	165	api.metric, api.nexthop_num, ifp ? ifp->name : "none");
2fb975da	166	}
9350687d RW	167
	168	zclient_route_send(add ? ZEBRA_ROUTE_ADD : ZEBRA_ROUTE_DELETE, zclient,
	169	&api);
2fb975da TT	170	}
	171
	172	int nhrp_route_read(int cmd, struct zclient *zclient, zebra_size_t length, vrf_id_t vrf_id)
	173	{
74489921 RW	174	struct zapi_route api;
74489921 RW	175	struct zapi_nexthop *api_nh;
2fb975da	176	struct interface *ifp = NULL;
2fb975da	177	union sockunion nexthop_addr;
2fb975da	178	char buf[2][PREFIX_STRLEN];
74489921	179	int added;
2fb975da	180
74489921	181	if (zapi_route_decode(zclient->ibuf, &api) < 0)
2fb975da	182	return -1;
74489921 RW	183
	184	/* we completely ignore srcdest routes for now. */
	185	if (CHECK_FLAG(api.message, ZAPI_MESSAGE_SRCPFX))
c125d1d4 RW	186	return 0;
c125d1d4 RW	187
74489921 RW	188	sockunion_family(&nexthop_addr) = AF_UNSPEC;
	189	if (CHECK_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP)) {
	190	api_nh = &api.nexthops[0];
	191
	192	nexthop_addr.sa.sa_family = api.prefix.family;
	193	switch (nexthop_addr.sa.sa_family) {
	194	case AF_INET:
	195	nexthop_addr.sin.sin_addr = api_nh->gate.ipv4;
	196	break;
	197	case AF_INET6:
	198	nexthop_addr.sin6.sin6_addr = api_nh->gate.ipv6;
	199	break;
2fb975da	200	}
74489921 RW	201
	202	if (api_nh->ifindex != IFINDEX_INTERNAL)
	203	ifp = if_lookup_by_index(api_nh->ifindex, VRF_DEFAULT);
2fb975da	204	}
2fb975da	205
74489921	206	added = (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD);
2fb975da TT	207	debugf(NHRP_DEBUG_ROUTE, "if-route-%s: %s via %s dev %s",
2fb975da TT	208	added ? "add" : "del",
74489921	209	prefix2str(&api.prefix, buf[0], sizeof buf[0]),
2fb975da TT	210	sockunion2str(&nexthop_addr, buf[1], sizeof buf[1]),
	211	ifp ? ifp->name : "(none)");
	212
74489921 RW	213	nhrp_route_update_zebra(&api.prefix, &nexthop_addr, ifp);
74489921 RW	214	nhrp_shortcut_prefix_change(&api.prefix, !added);
2fb975da TT	215
	216	return 0;
	217	}
	218
	219	int nhrp_route_get_nexthop(const union sockunion addr, struct prefix p, union sockunion via, struct interface *ifp)
	220	{
	221	struct route_node *rn;
	222	struct route_info *ri;
	223	struct prefix lookup;
	224	afi_t afi = family2afi(sockunion_family(addr));
	225	char buf[PREFIX_STRLEN];
	226
	227	sockunion2hostprefix(addr, &lookup);
	228
	229	rn = route_node_match(zebra_rib[afi], &lookup);
	230	if (!rn) return 0;
	231
	232	ri = rn->info;
	233	if (ri->nhrp_ifp) {
	234	debugf(NHRP_DEBUG_ROUTE, "lookup %s: nhrp_if=%s",
	235	prefix2str(&lookup, buf, sizeof buf),
	236	ri->nhrp_ifp->name);
	237
	238	if (via) sockunion_family(via) = AF_UNSPEC;
	239	if (ifp) *ifp = ri->nhrp_ifp;
	240	} else {
	241	debugf(NHRP_DEBUG_ROUTE, "lookup %s: zebra route dev %s",
	242	prefix2str(&lookup, buf, sizeof buf),
	243	ri->ifp ? ri->ifp->name : "(none)");
	244
	245	if (via) *via = ri->via;
	246	if (ifp) *ifp = ri->ifp;
	247	}
	248	if (p) *p = rn->p;
	249	route_unlock_node(rn);
	250	return 1;
	251	}
	252
	253	enum nhrp_route_type nhrp_route_address(struct interface in_ifp, union sockunion addr, struct prefix p, struct nhrp_peer *peer)
	254	{
	255	struct interface *ifp = in_ifp;
	256	struct nhrp_interface *nifp;
	257	struct nhrp_cache *c;
	258	union sockunion via[4];
	259	uint32_t network_id = 0;
	260	afi_t afi = family2afi(sockunion_family(addr));
	261	int i;
	262
	263	if (ifp) {
	264	nifp = ifp->info;
	265	network_id = nifp->afi[afi].network_id;
	266
	267	c = nhrp_cache_get(ifp, addr, 0);
	268	if (c && c->cur.type == NHRP_CACHE_LOCAL) {
	269	if (p) memset(p, 0, sizeof(*p));
	270	return NHRP_ROUTE_LOCAL;
	271	}
	272	}
	273
	274	for (i = 0; i < 4; i++) {
	275	if (!nhrp_route_get_nexthop(addr, p, &via[i], &ifp))
	276	return NHRP_ROUTE_BLACKHOLE;
	277	if (ifp) {
	278	/* Departing from nbma network? */
279	nifp = ifp->info;
280	if (network_id && network_id != nifp->afi[afi].network_id)
281	return NHRP_ROUTE_OFF_NBMA;
282	}
283	if (sockunion_family(&via[i]) == AF_UNSPEC)
284	break;
285	/* Resolve via node, but return the prefix of first match */
286	addr = &via[i];
287	p = NULL;
288	}
289
290	if (ifp) {
291	c = nhrp_cache_get(ifp, addr, 0);
292	if (c && c->cur.type >= NHRP_CACHE_DYNAMIC) {
293	if (p) memset(p, 0, sizeof(*p));
294	if (c->cur.type == NHRP_CACHE_LOCAL)
295	return NHRP_ROUTE_LOCAL;
296	if (peer) *peer = nhrp_peer_ref(c->cur.peer);
297	return NHRP_ROUTE_NBMA_NEXTHOP;
298	}
299	}
300
301	return NHRP_ROUTE_BLACKHOLE;
302	}
303
a1f1bab0 JB	304	static void
	305	nhrp_zebra_connected (struct zclient *zclient)
	306	{
	307	zclient_send_reg_requests(zclient, VRF_DEFAULT);
	308	zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP,
	309	ZEBRA_ROUTE_ALL, 0, VRF_DEFAULT);
	310	zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP6,
	311	ZEBRA_ROUTE_ALL, 0, VRF_DEFAULT);
	312	}
	313
2fb975da TT	314	void nhrp_zebra_init(void)
	315	{
	316	zebra_rib[AFI_IP] = route_table_init();
	317	zebra_rib[AFI_IP6] = route_table_init();
	318
e1a1880d	319	zclient = zclient_new_notify(master, &zclient_options_default);
a1f1bab0	320	zclient->zebra_connected = nhrp_zebra_connected;
2fb975da TT	321	zclient->interface_add = nhrp_interface_add;
	322	zclient->interface_delete = nhrp_interface_delete;
	323	zclient->interface_up = nhrp_interface_up;
	324	zclient->interface_down = nhrp_interface_down;
	325	zclient->interface_address_add = nhrp_interface_address_add;
	326	zclient->interface_address_delete = nhrp_interface_address_delete;
74489921 RW	327	zclient->redistribute_route_add = nhrp_route_read;
74489921 RW	328	zclient->redistribute_route_del = nhrp_route_read;
819dc8bb	329
342213ea	330	zclient_init(zclient, ZEBRA_ROUTE_NHRP, 0, &nhrpd_privs);
2fb975da TT	331	}
	332
	333	void nhrp_zebra_terminate(void)
	334	{
	335	zclient_stop(zclient);
20a11b25	336	zclient_free(zclient);
2fb975da TT	337	route_table_finish(zebra_rib[AFI_IP]);
	338	route_table_finish(zebra_rib[AFI_IP6]);
	339	}