[mirror_frr.git] / pimd / pim_zlookup.c

/*
 * PIM for Quagga
 * Copyright (C) 2008  Everton da Silva Marques
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; see the file COPYING; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <zebra.h>

#include "log.h"
#include "prefix.h"
#include "zclient.h"
#include "stream.h"
#include "network.h"
#include "thread.h"
#include "prefix.h"
#include "vty.h"
#include "lib_errors.h"

#include "pimd.h"
#include "pim_iface.h"
#include "pim_pim.h"
#include "pim_str.h"
#include "pim_oil.h"
#include "pim_zlookup.h"

static struct zclient *zlookup = NULL;
struct thread *zlookup_read;

static void zclient_lookup_sched(struct zclient *zlookup, int delay);
static int zclient_lookup_read_pipe(struct thread *thread);

/* Connect to zebra for nexthop lookup. */
static int zclient_lookup_connect(struct thread *t)
{
	struct zclient *zlookup;

	zlookup = THREAD_ARG(t);

	if (zlookup->sock >= 0) {
		return 0;
	}

	if (zclient_socket_connect(zlookup) < 0) {
		++zlookup->fail;
		zlog_warn("%s: failure connecting zclient socket: failures=%d",
			  __PRETTY_FUNCTION__, zlookup->fail);
	} else {
		zlookup->fail = 0; /* reset counter on connection */
	}

	if (zlookup->sock < 0) {
		/* Since last connect failed, retry within 10 secs */
		zclient_lookup_sched(zlookup, 10);
		return -1;
	}

	thread_add_timer(router->master, zclient_lookup_read_pipe, zlookup, 60,
			 &zlookup_read);
	return 0;
}

/* Schedule connection with delay. */
static void zclient_lookup_sched(struct zclient *zlookup, int delay)
{
	thread_add_timer(router->master, zclient_lookup_connect, zlookup, delay,
			 &zlookup->t_connect);

	zlog_notice("%s: zclient lookup connection scheduled for %d seconds",
		    __PRETTY_FUNCTION__, delay);
}

/* Schedule connection for now. */
static void zclient_lookup_sched_now(struct zclient *zlookup)
{
	thread_add_event(router->master, zclient_lookup_connect, zlookup, 0,
			 &zlookup->t_connect);

	zlog_notice("%s: zclient lookup immediate connection scheduled",
		    __PRETTY_FUNCTION__);
}

/* Schedule reconnection, if needed. */
static void zclient_lookup_reconnect(struct zclient *zlookup)
{
	if (zlookup->t_connect) {
		return;
	}

	zclient_lookup_sched_now(zlookup);
}

static void zclient_lookup_failed(struct zclient *zlookup)
{
	if (zlookup->sock >= 0) {
		if (close(zlookup->sock)) {
			zlog_warn("%s: closing fd=%d: errno=%d %s", __func__,
				  zlookup->sock, errno, safe_strerror(errno));
		}
		zlookup->sock = -1;
	}

	zclient_lookup_reconnect(zlookup);
}

void zclient_lookup_free(void)
{
	thread_cancel(zlookup_read);
	zclient_stop(zlookup);
	zclient_free(zlookup);
	zlookup = NULL;
}

void zclient_lookup_new(void)
{
	zlookup = zclient_new(router->master, &zclient_options_default);
	if (!zlookup) {
		flog_err(EC_LIB_ZAPI_SOCKET, "%s: zclient_new() failure",
			 __PRETTY_FUNCTION__);
		return;
	}

	zlookup->sock = -1;
	zlookup->t_connect = NULL;
	zlookup->privs = &pimd_privs;

	zclient_lookup_sched_now(zlookup);

	zlog_notice("%s: zclient lookup socket initialized",
		    __PRETTY_FUNCTION__);
}

static int zclient_read_nexthop(struct pim_instance *pim,
				struct zclient *zlookup,
				struct pim_zlookup_nexthop nexthop_tab[],
				const int tab_size, struct in_addr addr)
{
	int num_ifindex = 0;
	struct stream *s;
	uint16_t length;
	uint8_t marker;
	uint8_t version;
	vrf_id_t vrf_id;
	uint16_t command = 0;
	struct in_addr raddr;
	uint8_t distance;
	uint32_t metric;
	int nexthop_num;
	int i, err;

	if (PIM_DEBUG_PIM_NHT_DETAIL) {
		char addr_str[INET_ADDRSTRLEN];
		pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
		zlog_debug("%s: addr=%s(%s)", __PRETTY_FUNCTION__, addr_str,
			   pim->vrf->name);
	}

	s = zlookup->ibuf;

	while (command != ZEBRA_IPV4_NEXTHOP_LOOKUP_MRIB) {
		stream_reset(s);
		err = zclient_read_header(s, zlookup->sock, &length, &marker,
					  &version, &vrf_id, &command);
		if (err < 0) {
			flog_err(EC_LIB_ZAPI_MISSMATCH,
				 "%s: zclient_read_header() failed",
				 __PRETTY_FUNCTION__);
			zclient_lookup_failed(zlookup);
			return -1;
		}
	}

	raddr.s_addr = stream_get_ipv4(s);

	if (raddr.s_addr != addr.s_addr) {
		char addr_str[INET_ADDRSTRLEN];
		char raddr_str[INET_ADDRSTRLEN];
		pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
		pim_inet4_dump("<raddr?>", raddr, raddr_str, sizeof(raddr_str));
		zlog_warn("%s: address mismatch: addr=%s(%s) raddr=%s",
			  __PRETTY_FUNCTION__, addr_str, pim->vrf->name,
			  raddr_str);
		/* warning only */
	}

	distance = stream_getc(s);
	metric = stream_getl(s);
	nexthop_num = stream_getc(s);

	if (nexthop_num < 1) {
		if (PIM_DEBUG_PIM_NHT_DETAIL)
			zlog_debug("%s: socket %d bad nexthop_num=%d", __func__,
				   zlookup->sock, nexthop_num);
		return -6;
	}

	for (i = 0; i < nexthop_num; ++i) {
		vrf_id_t nexthop_vrf_id;
		enum nexthop_types_t nexthop_type;
		struct pim_neighbor *nbr;
		struct prefix p;

		nexthop_vrf_id = stream_getl(s);
		nexthop_type = stream_getc(s);
		if (num_ifindex >= tab_size) {
			char addr_str[INET_ADDRSTRLEN];
			pim_inet4_dump("<addr?>", addr, addr_str,
				       sizeof(addr_str));
			zlog_warn(
				"%s: found too many nexthop ifindexes (%d > %d) for address %s(%s)",
				__PRETTY_FUNCTION__, (num_ifindex + 1),
				tab_size, addr_str, pim->vrf->name);
			return num_ifindex;
		}
		nexthop_tab[num_ifindex].protocol_distance = distance;
		nexthop_tab[num_ifindex].route_metric = metric;
		nexthop_tab[num_ifindex].vrf_id = nexthop_vrf_id;
		switch (nexthop_type) {
		case NEXTHOP_TYPE_IFINDEX:
			nexthop_tab[num_ifindex].ifindex = stream_getl(s);
			/*
			 * Connected route (i.e. no nexthop), use
			 * address passed in as PIM nexthop.  This will
			 * allow us to work in cases where we are
			 * trying to find a route for this box.
			 */
			nexthop_tab[num_ifindex].nexthop_addr.family = AF_INET;
			nexthop_tab[num_ifindex].nexthop_addr.prefixlen =
				IPV4_MAX_BITLEN;
			nexthop_tab[num_ifindex].nexthop_addr.u.prefix4 =
				addr;
			++num_ifindex;
			break;
		case NEXTHOP_TYPE_IPV4_IFINDEX:
		case NEXTHOP_TYPE_IPV4:
			nexthop_tab[num_ifindex].nexthop_addr.family = AF_INET;
			nexthop_tab[num_ifindex].nexthop_addr.u.prefix4.s_addr =
				stream_get_ipv4(s);
			nexthop_tab[num_ifindex].ifindex = stream_getl(s);
			++num_ifindex;
			break;
		case NEXTHOP_TYPE_IPV6_IFINDEX:
			nexthop_tab[num_ifindex].nexthop_addr.family = AF_INET6;
			stream_get(&nexthop_tab[num_ifindex]
					    .nexthop_addr.u.prefix6,
				   s, sizeof(struct in6_addr));
			nexthop_tab[num_ifindex].ifindex = stream_getl(s);

			p.family = AF_INET6;
			p.prefixlen = IPV6_MAX_PREFIXLEN;
			memcpy(&p.u.prefix6,
			       &nexthop_tab[num_ifindex].nexthop_addr.u.prefix6,
			       sizeof(struct in6_addr));

			/*
			 * If we are sending v6 secondary assume we receive v6
			 * secondary
			 */
			if (pim->send_v6_secondary)
				nbr = pim_neighbor_find_by_secondary(
					if_lookup_by_index(
						nexthop_tab[num_ifindex]
							.ifindex,
						nexthop_vrf_id),
					&p);
			else
				nbr = pim_neighbor_find_if(if_lookup_by_index(
					nexthop_tab[num_ifindex].ifindex,
					nexthop_vrf_id));
			if (nbr) {
				nexthop_tab[num_ifindex].nexthop_addr.family =
					AF_INET;
				nexthop_tab[num_ifindex]
					.nexthop_addr.u.prefix4 =
					nbr->source_addr;
			}
			++num_ifindex;
			break;
		default:
			/* do nothing */
			{
				char addr_str[INET_ADDRSTRLEN];
				pim_inet4_dump("<addr?>", addr, addr_str,
					       sizeof(addr_str));
				zlog_warn(
					"%s: found non-ifindex nexthop type=%d for address %s(%s)",
					__PRETTY_FUNCTION__, nexthop_type,
					addr_str, pim->vrf->name);
			}
			break;
		}
	}

	return num_ifindex;
}

static int zclient_lookup_nexthop_once(struct pim_instance *pim,
				       struct pim_zlookup_nexthop nexthop_tab[],
				       const int tab_size, struct in_addr addr)
{
	struct stream *s;
	int ret;

	if (PIM_DEBUG_PIM_NHT_DETAIL) {
		char addr_str[INET_ADDRSTRLEN];
		pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
		zlog_debug("%s: addr=%s(%s)", __PRETTY_FUNCTION__, addr_str,
			   pim->vrf->name);
	}

	/* Check socket. */
	if (zlookup->sock < 0) {
		flog_err(EC_LIB_ZAPI_SOCKET,
			 "%s: zclient lookup socket is not connected",
			 __PRETTY_FUNCTION__);
		zclient_lookup_failed(zlookup);
		return -1;
	}

	if (pim->vrf->vrf_id == VRF_UNKNOWN) {
		zlog_notice(
			"%s: VRF: %s does not fully exist yet, delaying lookup",
			__PRETTY_FUNCTION__, pim->vrf->name);
		return -1;
	}

	s = zlookup->obuf;
	stream_reset(s);
	zclient_create_header(s, ZEBRA_IPV4_NEXTHOP_LOOKUP_MRIB, pim->vrf_id);
	stream_put_in_addr(s, &addr);
	stream_putw_at(s, 0, stream_get_endp(s));

	ret = writen(zlookup->sock, s->data, stream_get_endp(s));
	if (ret < 0) {
		flog_err(
			EC_LIB_SOCKET,
			"%s: writen() failure: %d writing to zclient lookup socket",
			__PRETTY_FUNCTION__, errno);
		zclient_lookup_failed(zlookup);
		return -2;
	}
	if (ret == 0) {
		flog_err_sys(EC_LIB_SOCKET,
			     "%s: connection closed on zclient lookup socket",
			     __PRETTY_FUNCTION__);
		zclient_lookup_failed(zlookup);
		return -3;
	}

	return zclient_read_nexthop(pim, zlookup, nexthop_tab, tab_size, addr);
}

int zclient_lookup_read_pipe(struct thread *thread)
{
	struct zclient *zlookup = THREAD_ARG(thread);
	struct pim_instance *pim = pim_get_pim_instance(VRF_DEFAULT);
	struct pim_zlookup_nexthop nexthop_tab[10];
	struct in_addr l = {.s_addr = INADDR_ANY};

	zclient_lookup_nexthop_once(pim, nexthop_tab, 10, l);
	thread_add_timer(router->master, zclient_lookup_read_pipe, zlookup, 60,
			 &zlookup_read);

	return 1;
}

int zclient_lookup_nexthop(struct pim_instance *pim,
			   struct pim_zlookup_nexthop nexthop_tab[],
			   const int tab_size, struct in_addr addr,
			   int max_lookup)
{
	int lookup;
	uint32_t route_metric = 0xFFFFFFFF;
	uint8_t protocol_distance = 0xFF;

	pim->nexthop_lookups++;

	for (lookup = 0; lookup < max_lookup; ++lookup) {
		int num_ifindex;
		int first_ifindex;
		struct prefix nexthop_addr;

		num_ifindex = zclient_lookup_nexthop_once(pim, nexthop_tab,
							  tab_size, addr);
		if (num_ifindex < 1) {
			if (PIM_DEBUG_PIM_NHT) {
				char addr_str[INET_ADDRSTRLEN];
				pim_inet4_dump("<addr?>", addr, addr_str,
					       sizeof(addr_str));
				zlog_debug(
					"%s: lookup=%d/%d: could not find nexthop ifindex for address %s(%s)",
					__PRETTY_FUNCTION__, lookup, max_lookup,
					addr_str, pim->vrf->name);
			}
			return -1;
		}

		if (lookup < 1) {
			/* this is the non-recursive lookup - save original
			 * metric/distance */
			route_metric = nexthop_tab[0].route_metric;
			protocol_distance = nexthop_tab[0].protocol_distance;
		}

		/*
		 * FIXME: Non-recursive nexthop ensured only for first ifindex.
		 * However, recursive route lookup should really be fixed in
		 * zebra daemon.
		 * See also TODO T24.
		 *
		 * So Zebra for NEXTHOP_TYPE_IPV4 returns the ifindex now since
		 * it was being stored.  This Doesn't solve all cases of
		 * recursive lookup but for the most common types it does.
		 */
		first_ifindex = nexthop_tab[0].ifindex;
		nexthop_addr = nexthop_tab[0].nexthop_addr;
		if (first_ifindex > 0) {
			/* found: first ifindex is non-recursive nexthop */

			if (lookup > 0) {
				/* Report non-recursive success after first
				 * lookup */
				if (PIM_DEBUG_PIM_NHT) {
					char addr_str[INET_ADDRSTRLEN];
					pim_inet4_dump("<addr?>", addr,
						       addr_str,
						       sizeof(addr_str));
					zlog_debug(
						"%s: lookup=%d/%d: found non-recursive ifindex=%d for address %s(%s) dist=%d met=%d",
						__PRETTY_FUNCTION__, lookup,
						max_lookup, first_ifindex,
						addr_str, pim->vrf->name,
						nexthop_tab[0]
							.protocol_distance,
						nexthop_tab[0].route_metric);
				}

				/* use last address as nexthop address */
				nexthop_tab[0].nexthop_addr.u.prefix4 = addr;

				/* report original route metric/distance */
				nexthop_tab[0].route_metric = route_metric;
				nexthop_tab[0].protocol_distance =
					protocol_distance;
			}

			return num_ifindex;
		}

		if (PIM_DEBUG_PIM_NHT) {
			char addr_str[INET_ADDRSTRLEN];
			char nexthop_str[PREFIX_STRLEN];
			pim_inet4_dump("<addr?>", addr, addr_str,
				       sizeof(addr_str));
			pim_addr_dump("<nexthop?>", &nexthop_addr, nexthop_str,
				      sizeof(nexthop_str));
			zlog_debug(
				"%s: lookup=%d/%d: zebra returned recursive nexthop %s for address %s(%s) dist=%d met=%d",
				__PRETTY_FUNCTION__, lookup, max_lookup,
				nexthop_str, addr_str, pim->vrf->name,
				nexthop_tab[0].protocol_distance,
				nexthop_tab[0].route_metric);
		}

		addr = nexthop_addr.u.prefix4; /* use nexthop addr for
						  recursive lookup */

	} /* for (max_lookup) */

	if (PIM_DEBUG_PIM_NHT) {
		char addr_str[INET_ADDRSTRLEN];
		pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
		zlog_warn(
			"%s: lookup=%d/%d: failure searching recursive nexthop ifindex for address %s(%s)",
			__PRETTY_FUNCTION__, lookup, max_lookup, addr_str,
			pim->vrf->name);
	}

	return -2;
}

void pim_zlookup_show_ip_multicast(struct vty *vty)
{
	vty_out(vty, "Zclient lookup socket: ");
	if (zlookup) {
		vty_out(vty, "%d failures=%d\n", zlookup->sock, zlookup->fail);
	} else {
		vty_out(vty, "<null zclient>\n");
	}
}

int pim_zlookup_sg_statistics(struct channel_oil *c_oil)
{
	struct stream *s = zlookup->obuf;
	uint16_t command = 0;
	unsigned long long lastused;
	struct prefix_sg sg;
	int count = 0;
	int ret;
	struct interface *ifp =
		pim_if_find_by_vif_index(c_oil->pim, c_oil->oil.mfcc_parent);

	if (PIM_DEBUG_ZEBRA) {
		struct prefix_sg more;

		more.src = c_oil->oil.mfcc_origin;
		more.grp = c_oil->oil.mfcc_mcastgrp;
		zlog_debug(
			"Sending Request for New Channel Oil Information%s VIIF %d(%s)",
			pim_str_sg_dump(&more), c_oil->oil.mfcc_parent,
			c_oil->pim->vrf->name);
	}

	if (!ifp)
		return -1;

	stream_reset(s);
	zclient_create_header(s, ZEBRA_IPMR_ROUTE_STATS, c_oil->pim->vrf_id);
	stream_put_in_addr(s, &c_oil->oil.mfcc_origin);
	stream_put_in_addr(s, &c_oil->oil.mfcc_mcastgrp);
	stream_putl(s, ifp->ifindex);
	stream_putw_at(s, 0, stream_get_endp(s));

	count = stream_get_endp(s);
	ret = writen(zlookup->sock, s->data, count);
	if (ret <= 0) {
		flog_err(
			EC_LIB_SOCKET,
			"%s: writen() failure: %d writing to zclient lookup socket",
			__PRETTY_FUNCTION__, errno);
		return -1;
	}

	s = zlookup->ibuf;

	while (command != ZEBRA_IPMR_ROUTE_STATS) {
		int err;
		uint16_t length = 0;
		vrf_id_t vrf_id;
		uint8_t marker;
		uint8_t version;

		stream_reset(s);
		err = zclient_read_header(s, zlookup->sock, &length, &marker,
					  &version, &vrf_id, &command);
		if (err < 0) {
			flog_err(EC_LIB_ZAPI_MISSMATCH,
				 "%s: zclient_read_header() failed",
				 __PRETTY_FUNCTION__);
			zclient_lookup_failed(zlookup);
			return -1;
		}
	}

	sg.src.s_addr = stream_get_ipv4(s);
	sg.grp.s_addr = stream_get_ipv4(s);
	if (sg.src.s_addr != c_oil->oil.mfcc_origin.s_addr
	    || sg.grp.s_addr != c_oil->oil.mfcc_mcastgrp.s_addr) {
		if (PIM_DEBUG_ZEBRA) {
			struct prefix_sg more;

			more.src = c_oil->oil.mfcc_origin;
			more.grp = c_oil->oil.mfcc_mcastgrp;
			flog_err(
				EC_LIB_ZAPI_MISSMATCH,
				"%s: Received wrong %s(%s) information requested",
				__PRETTY_FUNCTION__, pim_str_sg_dump(&more),
				c_oil->pim->vrf->name);
		}
		zclient_lookup_failed(zlookup);
		return -3;
	}

	stream_get(&lastused, s, sizeof(lastused));
	stream_getl(s);

	c_oil->cc.lastused = lastused;

	return 0;
}
Commit	Line	Data
12e41d03	1	/*
896014f4 DL	2	* PIM for Quagga
	3	* Copyright (C) 2008 Everton da Silva Marques
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2 of the License, or
	8	* (at your option) any later version.
	9	*
	10	* This program is distributed in the hope that it will be useful, but
	11	* WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	* General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License along
	16	* with this program; see the file COPYING; if not, write to the Free Software
	17	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	18	*/
12e41d03 DL	19
12e41d03 DL	20	#include <zebra.h>
12e41d03 DL	21
	22	#include "log.h"
	23	#include "prefix.h"
	24	#include "zclient.h"
	25	#include "stream.h"
	26	#include "network.h"
	27	#include "thread.h"
e3be0432	28	#include "prefix.h"
05b0d0d0	29	#include "vty.h"
3613d898	30	#include "lib_errors.h"
12e41d03 DL	31
12e41d03 DL	32	#include "pimd.h"
e3be0432	33	#include "pim_iface.h"
12e41d03 DL	34	#include "pim_pim.h"
12e41d03 DL	35	#include "pim_str.h"
e3be0432	36	#include "pim_oil.h"
12e41d03 DL	37	#include "pim_zlookup.h"
12e41d03 DL	38
05b0d0d0	39	static struct zclient *zlookup = NULL;
0da02f3a	40	struct thread *zlookup_read;
05b0d0d0	41
12e41d03	42	static void zclient_lookup_sched(struct zclient *zlookup, int delay);
0da02f3a	43	static int zclient_lookup_read_pipe(struct thread *thread);
12e41d03 DL	44
	45	/* Connect to zebra for nexthop lookup. */
	46	static int zclient_lookup_connect(struct thread *t)
	47	{
d62a17ae	48	struct zclient *zlookup;
	49
	50	zlookup = THREAD_ARG(t);
	51
	52	if (zlookup->sock >= 0) {
	53	return 0;
	54	}
	55
	56	if (zclient_socket_connect(zlookup) < 0) {
	57	++zlookup->fail;
	58	zlog_warn("%s: failure connecting zclient socket: failures=%d",
	59	__PRETTY_FUNCTION__, zlookup->fail);
	60	} else {
	61	zlookup->fail = 0; /* reset counter on connection */
	62	}
	63
	64	if (zlookup->sock < 0) {
	65	/* Since last connect failed, retry within 10 secs */
	66	zclient_lookup_sched(zlookup, 10);
	67	return -1;
	68	}
	69
0da02f3a DS	70	thread_add_timer(router->master, zclient_lookup_read_pipe, zlookup, 60,
0da02f3a DS	71	&zlookup_read);
d62a17ae	72	return 0;
12e41d03 DL	73	}
	74
	75	/* Schedule connection with delay. */
	76	static void zclient_lookup_sched(struct zclient *zlookup, int delay)
	77	{
36417fcc	78	thread_add_timer(router->master, zclient_lookup_connect, zlookup, delay,
d62a17ae	79	&zlookup->t_connect);
12e41d03	80
d62a17ae	81	zlog_notice("%s: zclient lookup connection scheduled for %d seconds",
d62a17ae	82	__PRETTY_FUNCTION__, delay);
12e41d03 DL	83	}
	84
	85	/* Schedule connection for now. */
	86	static void zclient_lookup_sched_now(struct zclient *zlookup)
	87	{
36417fcc	88	thread_add_event(router->master, zclient_lookup_connect, zlookup, 0,
d62a17ae	89	&zlookup->t_connect);
12e41d03	90
d62a17ae	91	zlog_notice("%s: zclient lookup immediate connection scheduled",
d62a17ae	92	__PRETTY_FUNCTION__);
12e41d03 DL	93	}
	94
	95	/* Schedule reconnection, if needed. */
	96	static void zclient_lookup_reconnect(struct zclient *zlookup)
	97	{
d62a17ae	98	if (zlookup->t_connect) {
	99	return;
	100	}
12e41d03	101
d62a17ae	102	zclient_lookup_sched_now(zlookup);
12e41d03 DL	103	}
	104
	105	static void zclient_lookup_failed(struct zclient *zlookup)
	106	{
d62a17ae	107	if (zlookup->sock >= 0) {
	108	if (close(zlookup->sock)) {
	109	zlog_warn("%s: closing fd=%d: errno=%d %s", __func__,
	110	zlookup->sock, errno, safe_strerror(errno));
	111	}
	112	zlookup->sock = -1;
	113	}
	114
	115	zclient_lookup_reconnect(zlookup);
12e41d03 DL	116	}
12e41d03 DL	117
d62a17ae	118	void zclient_lookup_free(void)
0b6817c5	119	{
0da02f3a	120	thread_cancel(zlookup_read);
d62a17ae	121	zclient_stop(zlookup);
	122	zclient_free(zlookup);
	123	zlookup = NULL;
0b6817c5 DS	124	}
0b6817c5 DS	125
d62a17ae	126	void zclient_lookup_new(void)
12e41d03	127	{
36417fcc	128	zlookup = zclient_new(router->master, &zclient_options_default);
d62a17ae	129	if (!zlookup) {
450971aa	130	flog_err(EC_LIB_ZAPI_SOCKET, "%s: zclient_new() failure",
1c50c1c0	131	__PRETTY_FUNCTION__);
d62a17ae	132	return;
d62a17ae	133	}
12e41d03	134
d62a17ae	135	zlookup->sock = -1;
d62a17ae	136	zlookup->t_connect = NULL;
342213ea	137	zlookup->privs = &pimd_privs;
12e41d03	138
d62a17ae	139	zclient_lookup_sched_now(zlookup);
12e41d03	140
d62a17ae	141	zlog_notice("%s: zclient lookup socket initialized",
d62a17ae	142	__PRETTY_FUNCTION__);
12e41d03 DL	143	}
12e41d03 DL	144
71edad0f DS	145	static int zclient_read_nexthop(struct pim_instance *pim,
71edad0f DS	146	struct zclient *zlookup,
12e41d03	147	struct pim_zlookup_nexthop nexthop_tab[],
d62a17ae	148	const int tab_size, struct in_addr addr)
12e41d03	149	{
d62a17ae	150	int num_ifindex = 0;
d62a17ae	151	struct stream *s;
d62a17ae	152	uint16_t length;
d7c0a89a QY	153	uint8_t marker;
d7c0a89a QY	154	uint8_t version;
d62a17ae	155	vrf_id_t vrf_id;
	156	uint16_t command = 0;
	157	struct in_addr raddr;
	158	uint8_t distance;
	159	uint32_t metric;
	160	int nexthop_num;
	161	int i, err;
	162
5cef40fc	163	if (PIM_DEBUG_PIM_NHT_DETAIL) {
d62a17ae	164	char addr_str[INET_ADDRSTRLEN];
d62a17ae	165	pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
5cef40fc DS	166	zlog_debug("%s: addr=%s(%s)", __PRETTY_FUNCTION__, addr_str,
5cef40fc DS	167	pim->vrf->name);
d62a17ae	168	}
	169
	170	s = zlookup->ibuf;
	171
	172	while (command != ZEBRA_IPV4_NEXTHOP_LOOKUP_MRIB) {
	173	stream_reset(s);
	174	err = zclient_read_header(s, zlookup->sock, &length, &marker,
	175	&version, &vrf_id, &command);
	176	if (err < 0) {
450971aa	177	flog_err(EC_LIB_ZAPI_MISSMATCH,
1c50c1c0 QY	178	"%s: zclient_read_header() failed",
1c50c1c0 QY	179	__PRETTY_FUNCTION__);
d62a17ae	180	zclient_lookup_failed(zlookup);
	181	return -1;
	182	}
d62a17ae	183	}
	184
	185	raddr.s_addr = stream_get_ipv4(s);
	186
	187	if (raddr.s_addr != addr.s_addr) {
	188	char addr_str[INET_ADDRSTRLEN];
	189	char raddr_str[INET_ADDRSTRLEN];
	190	pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
	191	pim_inet4_dump("<raddr?>", raddr, raddr_str, sizeof(raddr_str));
5cef40fc DS	192	zlog_warn("%s: address mismatch: addr=%s(%s) raddr=%s",
	193	__PRETTY_FUNCTION__, addr_str, pim->vrf->name,
	194	raddr_str);
d62a17ae	195	/* warning only */
	196	}
	197
	198	distance = stream_getc(s);
	199	metric = stream_getl(s);
	200	nexthop_num = stream_getc(s);
	201
	202	if (nexthop_num < 1) {
209a5679 DS	203	if (PIM_DEBUG_PIM_NHT_DETAIL)
	204	zlog_debug("%s: socket %d bad nexthop_num=%d", __func__,
	205	zlookup->sock, nexthop_num);
d62a17ae	206	return -6;
	207	}
	208
	209	for (i = 0; i < nexthop_num; ++i) {
a756969d	210	vrf_id_t nexthop_vrf_id;
d62a17ae	211	enum nexthop_types_t nexthop_type;
	212	struct pim_neighbor *nbr;
	213	struct prefix p;
	214
a756969d	215	nexthop_vrf_id = stream_getl(s);
d62a17ae	216	nexthop_type = stream_getc(s);
	217	if (num_ifindex >= tab_size) {
	218	char addr_str[INET_ADDRSTRLEN];
	219	pim_inet4_dump("<addr?>", addr, addr_str,
	220	sizeof(addr_str));
	221	zlog_warn(
5cef40fc DS	222	"%s: found too many nexthop ifindexes (%d > %d) for address %s(%s)",
	223	__PRETTY_FUNCTION__, (num_ifindex + 1),
	224	tab_size, addr_str, pim->vrf->name);
d62a17ae	225	return num_ifindex;
d62a17ae	226	}
56c1568b MB	227	nexthop_tab[num_ifindex].protocol_distance = distance;
56c1568b MB	228	nexthop_tab[num_ifindex].route_metric = metric;
a756969d	229	nexthop_tab[num_ifindex].vrf_id = nexthop_vrf_id;
d62a17ae	230	switch (nexthop_type) {
d62a17ae	231	case NEXTHOP_TYPE_IFINDEX:
66f5152f MB	232	nexthop_tab[num_ifindex].ifindex = stream_getl(s);
	233	/*
	234	* Connected route (i.e. no nexthop), use
	235	* address passed in as PIM nexthop. This will
	236	* allow us to work in cases where we are
	237	* trying to find a route for this box.
	238	*/
	239	nexthop_tab[num_ifindex].nexthop_addr.family = AF_INET;
	240	nexthop_tab[num_ifindex].nexthop_addr.prefixlen =
	241	IPV4_MAX_BITLEN;
	242	nexthop_tab[num_ifindex].nexthop_addr.u.prefix4 =
	243	addr;
	244	++num_ifindex;
	245	break;
d62a17ae	246	case NEXTHOP_TYPE_IPV4_IFINDEX:
	247	case NEXTHOP_TYPE_IPV4:
	248	nexthop_tab[num_ifindex].nexthop_addr.family = AF_INET;
66f5152f MB	249	nexthop_tab[num_ifindex].nexthop_addr.u.prefix4.s_addr =
66f5152f MB	250	stream_get_ipv4(s);
d62a17ae	251	nexthop_tab[num_ifindex].ifindex = stream_getl(s);
d62a17ae	252	++num_ifindex;
	253	break;
	254	case NEXTHOP_TYPE_IPV6_IFINDEX:
	255	nexthop_tab[num_ifindex].nexthop_addr.family = AF_INET6;
	256	stream_get(&nexthop_tab[num_ifindex]
	257	.nexthop_addr.u.prefix6,
	258	s, sizeof(struct in6_addr));
	259	nexthop_tab[num_ifindex].ifindex = stream_getl(s);
	260
	261	p.family = AF_INET6;
	262	p.prefixlen = IPV6_MAX_PREFIXLEN;
	263	memcpy(&p.u.prefix6,
	264	&nexthop_tab[num_ifindex].nexthop_addr.u.prefix6,
	265	sizeof(struct in6_addr));
	266
	267	/*
	268	* If we are sending v6 secondary assume we receive v6
	269	* secondary
	270	*/
71edad0f	271	if (pim->send_v6_secondary)
d62a17ae	272	nbr = pim_neighbor_find_by_secondary(
	273	if_lookup_by_index(
	274	nexthop_tab[num_ifindex]
	275	.ifindex,
a756969d	276	nexthop_vrf_id),
d62a17ae	277	&p);
	278	else
	279	nbr = pim_neighbor_find_if(if_lookup_by_index(
	280	nexthop_tab[num_ifindex].ifindex,
a756969d	281	nexthop_vrf_id));
d62a17ae	282	if (nbr) {
	283	nexthop_tab[num_ifindex].nexthop_addr.family =
	284	AF_INET;
	285	nexthop_tab[num_ifindex]
	286	.nexthop_addr.u.prefix4 =
	287	nbr->source_addr;
	288	}
	289	++num_ifindex;
	290	break;
56c1568b MB	291	default:
	292	/* do nothing */
	293	{
	294	char addr_str[INET_ADDRSTRLEN];
	295	pim_inet4_dump("<addr?>", addr, addr_str,
	296	sizeof(addr_str));
	297	zlog_warn(
	298	"%s: found non-ifindex nexthop type=%d for address %s(%s)",
	299	__PRETTY_FUNCTION__, nexthop_type,
	300	addr_str, pim->vrf->name);
	301	}
	302	break;
d62a17ae	303	}
	304	}
	305
	306	return num_ifindex;
12e41d03 DL	307	}
12e41d03 DL	308
71edad0f DS	309	static int zclient_lookup_nexthop_once(struct pim_instance *pim,
71edad0f DS	310	struct pim_zlookup_nexthop nexthop_tab[],
d62a17ae	311	const int tab_size, struct in_addr addr)
12e41d03	312	{
d62a17ae	313	struct stream *s;
	314	int ret;
	315
5cef40fc	316	if (PIM_DEBUG_PIM_NHT_DETAIL) {
d62a17ae	317	char addr_str[INET_ADDRSTRLEN];
d62a17ae	318	pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
5cef40fc DS	319	zlog_debug("%s: addr=%s(%s)", __PRETTY_FUNCTION__, addr_str,
5cef40fc DS	320	pim->vrf->name);
d62a17ae	321	}
	322
	323	/* Check socket. */
	324	if (zlookup->sock < 0) {
450971aa	325	flog_err(EC_LIB_ZAPI_SOCKET,
1c50c1c0 QY	326	"%s: zclient lookup socket is not connected",
1c50c1c0 QY	327	__PRETTY_FUNCTION__);
d62a17ae	328	zclient_lookup_failed(zlookup);
	329	return -1;
	330	}
	331
3af2452c	332	if (pim->vrf->vrf_id == VRF_UNKNOWN) {
d9ff4302	333	zlog_notice(
3af2452c DS	334	"%s: VRF: %s does not fully exist yet, delaying lookup",
	335	__PRETTY_FUNCTION__, pim->vrf->name);
	336	return -1;
	337	}
	338
d62a17ae	339	s = zlookup->obuf;
d62a17ae	340	stream_reset(s);
71edad0f	341	zclient_create_header(s, ZEBRA_IPV4_NEXTHOP_LOOKUP_MRIB, pim->vrf_id);
d62a17ae	342	stream_put_in_addr(s, &addr);
	343	stream_putw_at(s, 0, stream_get_endp(s));
	344
	345	ret = writen(zlookup->sock, s->data, stream_get_endp(s));
	346	if (ret < 0) {
af4c2728	347	flog_err(
450971aa	348	EC_LIB_SOCKET,
5cef40fc DS	349	"%s: writen() failure: %d writing to zclient lookup socket",
5cef40fc DS	350	__PRETTY_FUNCTION__, errno);
d62a17ae	351	zclient_lookup_failed(zlookup);
	352	return -2;
	353	}
	354	if (ret == 0) {
450971aa	355	flog_err_sys(EC_LIB_SOCKET,
09c866e3 QY	356	"%s: connection closed on zclient lookup socket",
09c866e3 QY	357	__PRETTY_FUNCTION__);
d62a17ae	358	zclient_lookup_failed(zlookup);
	359	return -3;
	360	}
	361
71edad0f	362	return zclient_read_nexthop(pim, zlookup, nexthop_tab, tab_size, addr);
12e41d03 DL	363	}
12e41d03 DL	364
0da02f3a DS	365	int zclient_lookup_read_pipe(struct thread *thread)
	366	{
	367	struct zclient *zlookup = THREAD_ARG(thread);
	368	struct pim_instance *pim = pim_get_pim_instance(VRF_DEFAULT);
	369	struct pim_zlookup_nexthop nexthop_tab[10];
	370	struct in_addr l = {.s_addr = INADDR_ANY};
	371
	372	zclient_lookup_nexthop_once(pim, nexthop_tab, 10, l);
	373	thread_add_timer(router->master, zclient_lookup_read_pipe, zlookup, 60,
	374	&zlookup_read);
	375
	376	return 1;
	377	}
	378
71edad0f DS	379	int zclient_lookup_nexthop(struct pim_instance *pim,
71edad0f DS	380	struct pim_zlookup_nexthop nexthop_tab[],
d62a17ae	381	const int tab_size, struct in_addr addr,
d62a17ae	382	int max_lookup)
12e41d03	383	{
d62a17ae	384	int lookup;
	385	uint32_t route_metric = 0xFFFFFFFF;
	386	uint8_t protocol_distance = 0xFF;
	387
bfc92019	388	pim->nexthop_lookups++;
d62a17ae	389
	390	for (lookup = 0; lookup < max_lookup; ++lookup) {
	391	int num_ifindex;
	392	int first_ifindex;
	393	struct prefix nexthop_addr;
	394
71edad0f DS	395	num_ifindex = zclient_lookup_nexthop_once(pim, nexthop_tab,
71edad0f DS	396	tab_size, addr);
d62a17ae	397	if (num_ifindex < 1) {
5cef40fc	398	if (PIM_DEBUG_PIM_NHT) {
d62a17ae	399	char addr_str[INET_ADDRSTRLEN];
	400	pim_inet4_dump("<addr?>", addr, addr_str,
	401	sizeof(addr_str));
	402	zlog_debug(
5cef40fc DS	403	"%s: lookup=%d/%d: could not find nexthop ifindex for address %s(%s)",
	404	__PRETTY_FUNCTION__, lookup, max_lookup,
	405	addr_str, pim->vrf->name);
d62a17ae	406	}
	407	return -1;
	408	}
	409
	410	if (lookup < 1) {
	411	/* this is the non-recursive lookup - save original
	412	* metric/distance */
	413	route_metric = nexthop_tab[0].route_metric;
	414	protocol_distance = nexthop_tab[0].protocol_distance;
	415	}
	416
	417	/*
	418	* FIXME: Non-recursive nexthop ensured only for first ifindex.
	419	* However, recursive route lookup should really be fixed in
	420	* zebra daemon.
	421	* See also TODO T24.
	422	*
	423	* So Zebra for NEXTHOP_TYPE_IPV4 returns the ifindex now since
	424	* it was being stored. This Doesn't solve all cases of
	425	* recursive lookup but for the most common types it does.
	426	*/
	427	first_ifindex = nexthop_tab[0].ifindex;
	428	nexthop_addr = nexthop_tab[0].nexthop_addr;
	429	if (first_ifindex > 0) {
	430	/* found: first ifindex is non-recursive nexthop */
	431
	432	if (lookup > 0) {
	433	/* Report non-recursive success after first
	434	* lookup */
5cef40fc	435	if (PIM_DEBUG_PIM_NHT) {
d62a17ae	436	char addr_str[INET_ADDRSTRLEN];
	437	pim_inet4_dump("<addr?>", addr,
	438	addr_str,
	439	sizeof(addr_str));
	440	zlog_debug(
5cef40fc DS	441	"%s: lookup=%d/%d: found non-recursive ifindex=%d for address %s(%s) dist=%d met=%d",
	442	__PRETTY_FUNCTION__, lookup,
	443	max_lookup, first_ifindex,
	444	addr_str, pim->vrf->name,
d62a17ae	445	nexthop_tab[0]
	446	.protocol_distance,
	447	nexthop_tab[0].route_metric);
	448	}
	449
	450	/* use last address as nexthop address */
	451	nexthop_tab[0].nexthop_addr.u.prefix4 = addr;
	452
	453	/* report original route metric/distance */
	454	nexthop_tab[0].route_metric = route_metric;
	455	nexthop_tab[0].protocol_distance =
	456	protocol_distance;
	457	}
	458
	459	return num_ifindex;
	460	}
	461
5cef40fc	462	if (PIM_DEBUG_PIM_NHT) {
d62a17ae	463	char addr_str[INET_ADDRSTRLEN];
	464	char nexthop_str[PREFIX_STRLEN];
	465	pim_inet4_dump("<addr?>", addr, addr_str,
	466	sizeof(addr_str));
	467	pim_addr_dump("<nexthop?>", &nexthop_addr, nexthop_str,
	468	sizeof(nexthop_str));
	469	zlog_debug(
5cef40fc DS	470	"%s: lookup=%d/%d: zebra returned recursive nexthop %s for address %s(%s) dist=%d met=%d",
	471	__PRETTY_FUNCTION__, lookup, max_lookup,
	472	nexthop_str, addr_str, pim->vrf->name,
d62a17ae	473	nexthop_tab[0].protocol_distance,
	474	nexthop_tab[0].route_metric);
	475	}
	476
996c9314 LB	477	addr = nexthop_addr.u.prefix4; /* use nexthop addr for
996c9314 LB	478	recursive lookup */
d62a17ae	479
	480	} /* for (max_lookup) */
	481
5cef40fc	482	if (PIM_DEBUG_PIM_NHT) {
d62a17ae	483	char addr_str[INET_ADDRSTRLEN];
	484	pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
	485	zlog_warn(
5cef40fc DS	486	"%s: lookup=%d/%d: failure searching recursive nexthop ifindex for address %s(%s)",
	487	__PRETTY_FUNCTION__, lookup, max_lookup, addr_str,
	488	pim->vrf->name);
d5a0a629	489	}
12e41d03	490
d62a17ae	491	return -2;
12e41d03	492	}
05b0d0d0	493
d62a17ae	494	void pim_zlookup_show_ip_multicast(struct vty *vty)
05b0d0d0	495	{
d62a17ae	496	vty_out(vty, "Zclient lookup socket: ");
	497	if (zlookup) {
	498	vty_out(vty, "%d failures=%d\n", zlookup->sock, zlookup->fail);
	499	} else {
	500	vty_out(vty, "<null zclient>\n");
	501	}
05b0d0d0	502	}
e3be0432	503
d62a17ae	504	int pim_zlookup_sg_statistics(struct channel_oil *c_oil)
e3be0432	505	{
d62a17ae	506	struct stream *s = zlookup->obuf;
	507	uint16_t command = 0;
	508	unsigned long long lastused;
	509	struct prefix_sg sg;
	510	int count = 0;
	511	int ret;
	512	struct interface *ifp =
7cfc7bcf	513	pim_if_find_by_vif_index(c_oil->pim, c_oil->oil.mfcc_parent);
d62a17ae	514
	515	if (PIM_DEBUG_ZEBRA) {
	516	struct prefix_sg more;
	517
	518	more.src = c_oil->oil.mfcc_origin;
	519	more.grp = c_oil->oil.mfcc_mcastgrp;
	520	zlog_debug(
41714081	521	"Sending Request for New Channel Oil Information%s VIIF %d(%s)",
5cef40fc DS	522	pim_str_sg_dump(&more), c_oil->oil.mfcc_parent,
5cef40fc DS	523	c_oil->pim->vrf->name);
d62a17ae	524	}
	525
	526	if (!ifp)
	527	return -1;
	528
	529	stream_reset(s);
71edad0f	530	zclient_create_header(s, ZEBRA_IPMR_ROUTE_STATS, c_oil->pim->vrf_id);
d62a17ae	531	stream_put_in_addr(s, &c_oil->oil.mfcc_origin);
	532	stream_put_in_addr(s, &c_oil->oil.mfcc_mcastgrp);
	533	stream_putl(s, ifp->ifindex);
	534	stream_putw_at(s, 0, stream_get_endp(s));
	535
	536	count = stream_get_endp(s);
	537	ret = writen(zlookup->sock, s->data, count);
	538	if (ret <= 0) {
af4c2728	539	flog_err(
450971aa	540	EC_LIB_SOCKET,
5cef40fc DS	541	"%s: writen() failure: %d writing to zclient lookup socket",
5cef40fc DS	542	__PRETTY_FUNCTION__, errno);
d62a17ae	543	return -1;
	544	}
	545
	546	s = zlookup->ibuf;
	547
	548	while (command != ZEBRA_IPMR_ROUTE_STATS) {
	549	int err;
	550	uint16_t length = 0;
	551	vrf_id_t vrf_id;
d7c0a89a QY	552	uint8_t marker;
d7c0a89a QY	553	uint8_t version;
d62a17ae	554
	555	stream_reset(s);
	556	err = zclient_read_header(s, zlookup->sock, &length, &marker,
	557	&version, &vrf_id, &command);
	558	if (err < 0) {
450971aa	559	flog_err(EC_LIB_ZAPI_MISSMATCH,
1c50c1c0 QY	560	"%s: zclient_read_header() failed",
1c50c1c0 QY	561	__PRETTY_FUNCTION__);
d62a17ae	562	zclient_lookup_failed(zlookup);
	563	return -1;
	564	}
	565	}
	566
	567	sg.src.s_addr = stream_get_ipv4(s);
	568	sg.grp.s_addr = stream_get_ipv4(s);
	569	if (sg.src.s_addr != c_oil->oil.mfcc_origin.s_addr
	570	\|\| sg.grp.s_addr != c_oil->oil.mfcc_mcastgrp.s_addr) {
5667319b DS	571	if (PIM_DEBUG_ZEBRA) {
	572	struct prefix_sg more;
	573
	574	more.src = c_oil->oil.mfcc_origin;
	575	more.grp = c_oil->oil.mfcc_mcastgrp;
af4c2728	576	flog_err(
450971aa	577	EC_LIB_ZAPI_MISSMATCH,
5cef40fc DS	578	"%s: Received wrong %s(%s) information requested",
	579	__PRETTY_FUNCTION__, pim_str_sg_dump(&more),
	580	c_oil->pim->vrf->name);
5667319b	581	}
d62a17ae	582	zclient_lookup_failed(zlookup);
	583	return -3;
	584	}
	585
	586	stream_get(&lastused, s, sizeof(lastused));
467c85f7	587	stream_getl(s);
d62a17ae	588
d62a17ae	589	c_oil->cc.lastused = lastused;
e3be0432	590
d62a17ae	591	return 0;
e3be0432	592	}