[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;

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

/* 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;
	}

	return 0;
}

/* Schedule connection with delay. */
static void zclient_lookup_sched(struct zclient *zlookup, int delay)
{
	thread_add_timer(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(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)
{
	zclient_stop(zlookup);
	zclient_free(zlookup);
	zlookup = NULL;
}

void zclient_lookup_new(void)
{
	zlookup = zclient_new_notify(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) {
		enum nexthop_types_t nexthop_type;
		struct pim_neighbor *nbr;
		struct prefix p;

		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;
		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,
						vrf_id),
					&p);
			else
				nbr = pim_neighbor_find_if(if_lookup_by_index(
					nexthop_tab[num_ifindex].ifindex,
					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_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 DS	39	static struct zclient *zlookup = NULL;
05b0d0d0 DS	40
12e41d03 DL	41	static void zclient_lookup_sched(struct zclient *zlookup, int delay);
	42
	43	/* Connect to zebra for nexthop lookup. */
	44	static int zclient_lookup_connect(struct thread *t)
	45	{
d62a17ae	46	struct zclient *zlookup;
	47
	48	zlookup = THREAD_ARG(t);
	49
	50	if (zlookup->sock >= 0) {
	51	return 0;
	52	}
	53
	54	if (zclient_socket_connect(zlookup) < 0) {
	55	++zlookup->fail;
	56	zlog_warn("%s: failure connecting zclient socket: failures=%d",
	57	__PRETTY_FUNCTION__, zlookup->fail);
	58	} else {
	59	zlookup->fail = 0; /* reset counter on connection */
	60	}
	61
	62	if (zlookup->sock < 0) {
	63	/* Since last connect failed, retry within 10 secs */
	64	zclient_lookup_sched(zlookup, 10);
	65	return -1;
	66	}
	67
	68	return 0;
12e41d03 DL	69	}
	70
	71	/* Schedule connection with delay. */
	72	static void zclient_lookup_sched(struct zclient *zlookup, int delay)
	73	{
d62a17ae	74	thread_add_timer(master, zclient_lookup_connect, zlookup, delay,
d62a17ae	75	&zlookup->t_connect);
12e41d03	76
d62a17ae	77	zlog_notice("%s: zclient lookup connection scheduled for %d seconds",
d62a17ae	78	__PRETTY_FUNCTION__, delay);
12e41d03 DL	79	}
	80
	81	/* Schedule connection for now. */
	82	static void zclient_lookup_sched_now(struct zclient *zlookup)
	83	{
d62a17ae	84	thread_add_event(master, zclient_lookup_connect, zlookup, 0,
d62a17ae	85	&zlookup->t_connect);
12e41d03	86
d62a17ae	87	zlog_notice("%s: zclient lookup immediate connection scheduled",
d62a17ae	88	__PRETTY_FUNCTION__);
12e41d03 DL	89	}
	90
	91	/* Schedule reconnection, if needed. */
	92	static void zclient_lookup_reconnect(struct zclient *zlookup)
	93	{
d62a17ae	94	if (zlookup->t_connect) {
	95	return;
	96	}
12e41d03	97
d62a17ae	98	zclient_lookup_sched_now(zlookup);
12e41d03 DL	99	}
	100
	101	static void zclient_lookup_failed(struct zclient *zlookup)
	102	{
d62a17ae	103	if (zlookup->sock >= 0) {
	104	if (close(zlookup->sock)) {
	105	zlog_warn("%s: closing fd=%d: errno=%d %s", __func__,
	106	zlookup->sock, errno, safe_strerror(errno));
	107	}
	108	zlookup->sock = -1;
	109	}
	110
	111	zclient_lookup_reconnect(zlookup);
12e41d03 DL	112	}
12e41d03 DL	113
d62a17ae	114	void zclient_lookup_free(void)
0b6817c5	115	{
d62a17ae	116	zclient_stop(zlookup);
	117	zclient_free(zlookup);
	118	zlookup = NULL;
0b6817c5 DS	119	}
0b6817c5 DS	120
d62a17ae	121	void zclient_lookup_new(void)
12e41d03	122	{
e1a1880d	123	zlookup = zclient_new_notify(master, &zclient_options_default);
d62a17ae	124	if (!zlookup) {
450971aa	125	flog_err(EC_LIB_ZAPI_SOCKET, "%s: zclient_new() failure",
1c50c1c0	126	__PRETTY_FUNCTION__);
d62a17ae	127	return;
d62a17ae	128	}
12e41d03	129
d62a17ae	130	zlookup->sock = -1;
d62a17ae	131	zlookup->t_connect = NULL;
342213ea	132	zlookup->privs = &pimd_privs;
12e41d03	133
d62a17ae	134	zclient_lookup_sched_now(zlookup);
12e41d03	135
d62a17ae	136	zlog_notice("%s: zclient lookup socket initialized",
d62a17ae	137	__PRETTY_FUNCTION__);
12e41d03 DL	138	}
12e41d03 DL	139
71edad0f DS	140	static int zclient_read_nexthop(struct pim_instance *pim,
71edad0f DS	141	struct zclient *zlookup,
12e41d03	142	struct pim_zlookup_nexthop nexthop_tab[],
d62a17ae	143	const int tab_size, struct in_addr addr)
12e41d03	144	{
d62a17ae	145	int num_ifindex = 0;
d62a17ae	146	struct stream *s;
d62a17ae	147	uint16_t length;
d7c0a89a QY	148	uint8_t marker;
d7c0a89a QY	149	uint8_t version;
d62a17ae	150	vrf_id_t vrf_id;
	151	uint16_t command = 0;
	152	struct in_addr raddr;
	153	uint8_t distance;
	154	uint32_t metric;
	155	int nexthop_num;
	156	int i, err;
	157
5cef40fc	158	if (PIM_DEBUG_PIM_NHT_DETAIL) {
d62a17ae	159	char addr_str[INET_ADDRSTRLEN];
d62a17ae	160	pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
5cef40fc DS	161	zlog_debug("%s: addr=%s(%s)", __PRETTY_FUNCTION__, addr_str,
5cef40fc DS	162	pim->vrf->name);
d62a17ae	163	}
	164
	165	s = zlookup->ibuf;
	166
	167	while (command != ZEBRA_IPV4_NEXTHOP_LOOKUP_MRIB) {
	168	stream_reset(s);
	169	err = zclient_read_header(s, zlookup->sock, &length, &marker,
	170	&version, &vrf_id, &command);
	171	if (err < 0) {
450971aa	172	flog_err(EC_LIB_ZAPI_MISSMATCH,
1c50c1c0 QY	173	"%s: zclient_read_header() failed",
1c50c1c0 QY	174	__PRETTY_FUNCTION__);
d62a17ae	175	zclient_lookup_failed(zlookup);
	176	return -1;
	177	}
d62a17ae	178	}
	179
	180	raddr.s_addr = stream_get_ipv4(s);
	181
	182	if (raddr.s_addr != addr.s_addr) {
	183	char addr_str[INET_ADDRSTRLEN];
	184	char raddr_str[INET_ADDRSTRLEN];
	185	pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
	186	pim_inet4_dump("<raddr?>", raddr, raddr_str, sizeof(raddr_str));
5cef40fc DS	187	zlog_warn("%s: address mismatch: addr=%s(%s) raddr=%s",
	188	__PRETTY_FUNCTION__, addr_str, pim->vrf->name,
	189	raddr_str);
d62a17ae	190	/* warning only */
	191	}
	192
	193	distance = stream_getc(s);
	194	metric = stream_getl(s);
	195	nexthop_num = stream_getc(s);
	196
	197	if (nexthop_num < 1) {
209a5679 DS	198	if (PIM_DEBUG_PIM_NHT_DETAIL)
	199	zlog_debug("%s: socket %d bad nexthop_num=%d", __func__,
	200	zlookup->sock, nexthop_num);
d62a17ae	201	return -6;
	202	}
	203
	204	for (i = 0; i < nexthop_num; ++i) {
	205	enum nexthop_types_t nexthop_type;
	206	struct pim_neighbor *nbr;
	207	struct prefix p;
	208
	209	nexthop_type = stream_getc(s);
	210	if (num_ifindex >= tab_size) {
	211	char addr_str[INET_ADDRSTRLEN];
	212	pim_inet4_dump("<addr?>", addr, addr_str,
	213	sizeof(addr_str));
	214	zlog_warn(
5cef40fc DS	215	"%s: found too many nexthop ifindexes (%d > %d) for address %s(%s)",
	216	__PRETTY_FUNCTION__, (num_ifindex + 1),
	217	tab_size, addr_str, pim->vrf->name);
d62a17ae	218	return num_ifindex;
d62a17ae	219	}
56c1568b MB	220	nexthop_tab[num_ifindex].protocol_distance = distance;
56c1568b MB	221	nexthop_tab[num_ifindex].route_metric = metric;
d62a17ae	222	switch (nexthop_type) {
d62a17ae	223	case NEXTHOP_TYPE_IFINDEX:
66f5152f MB	224	nexthop_tab[num_ifindex].ifindex = stream_getl(s);
	225	/*
	226	* Connected route (i.e. no nexthop), use
	227	* address passed in as PIM nexthop. This will
	228	* allow us to work in cases where we are
	229	* trying to find a route for this box.
	230	*/
	231	nexthop_tab[num_ifindex].nexthop_addr.family = AF_INET;
	232	nexthop_tab[num_ifindex].nexthop_addr.prefixlen =
	233	IPV4_MAX_BITLEN;
	234	nexthop_tab[num_ifindex].nexthop_addr.u.prefix4 =
	235	addr;
	236	++num_ifindex;
	237	break;
d62a17ae	238	case NEXTHOP_TYPE_IPV4_IFINDEX:
	239	case NEXTHOP_TYPE_IPV4:
	240	nexthop_tab[num_ifindex].nexthop_addr.family = AF_INET;
66f5152f MB	241	nexthop_tab[num_ifindex].nexthop_addr.u.prefix4.s_addr =
66f5152f MB	242	stream_get_ipv4(s);
d62a17ae	243	nexthop_tab[num_ifindex].ifindex = stream_getl(s);
d62a17ae	244	++num_ifindex;
	245	break;
	246	case NEXTHOP_TYPE_IPV6_IFINDEX:
	247	nexthop_tab[num_ifindex].nexthop_addr.family = AF_INET6;
	248	stream_get(&nexthop_tab[num_ifindex]
	249	.nexthop_addr.u.prefix6,
	250	s, sizeof(struct in6_addr));
	251	nexthop_tab[num_ifindex].ifindex = stream_getl(s);
	252
	253	p.family = AF_INET6;
	254	p.prefixlen = IPV6_MAX_PREFIXLEN;
	255	memcpy(&p.u.prefix6,
	256	&nexthop_tab[num_ifindex].nexthop_addr.u.prefix6,
	257	sizeof(struct in6_addr));
	258
	259	/*
	260	* If we are sending v6 secondary assume we receive v6
	261	* secondary
	262	*/
71edad0f	263	if (pim->send_v6_secondary)
d62a17ae	264	nbr = pim_neighbor_find_by_secondary(
	265	if_lookup_by_index(
	266	nexthop_tab[num_ifindex]
	267	.ifindex,
71edad0f	268	vrf_id),
d62a17ae	269	&p);
	270	else
	271	nbr = pim_neighbor_find_if(if_lookup_by_index(
	272	nexthop_tab[num_ifindex].ifindex,
71edad0f	273	vrf_id));
d62a17ae	274	if (nbr) {
	275	nexthop_tab[num_ifindex].nexthop_addr.family =
	276	AF_INET;
	277	nexthop_tab[num_ifindex]
	278	.nexthop_addr.u.prefix4 =
	279	nbr->source_addr;
	280	}
	281	++num_ifindex;
	282	break;
56c1568b MB	283	default:
	284	/* do nothing */
	285	{
	286	char addr_str[INET_ADDRSTRLEN];
	287	pim_inet4_dump("<addr?>", addr, addr_str,
	288	sizeof(addr_str));
	289	zlog_warn(
	290	"%s: found non-ifindex nexthop type=%d for address %s(%s)",
	291	__PRETTY_FUNCTION__, nexthop_type,
	292	addr_str, pim->vrf->name);
	293	}
	294	break;
d62a17ae	295	}
	296	}
	297
	298	return num_ifindex;
12e41d03 DL	299	}
12e41d03 DL	300
71edad0f DS	301	static int zclient_lookup_nexthop_once(struct pim_instance *pim,
71edad0f DS	302	struct pim_zlookup_nexthop nexthop_tab[],
d62a17ae	303	const int tab_size, struct in_addr addr)
12e41d03	304	{
d62a17ae	305	struct stream *s;
	306	int ret;
	307
5cef40fc	308	if (PIM_DEBUG_PIM_NHT_DETAIL) {
d62a17ae	309	char addr_str[INET_ADDRSTRLEN];
d62a17ae	310	pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
5cef40fc DS	311	zlog_debug("%s: addr=%s(%s)", __PRETTY_FUNCTION__, addr_str,
5cef40fc DS	312	pim->vrf->name);
d62a17ae	313	}
	314
	315	/* Check socket. */
	316	if (zlookup->sock < 0) {
450971aa	317	flog_err(EC_LIB_ZAPI_SOCKET,
1c50c1c0 QY	318	"%s: zclient lookup socket is not connected",
1c50c1c0 QY	319	__PRETTY_FUNCTION__);
d62a17ae	320	zclient_lookup_failed(zlookup);
	321	return -1;
	322	}
	323
3af2452c	324	if (pim->vrf->vrf_id == VRF_UNKNOWN) {
d9ff4302	325	zlog_notice(
3af2452c DS	326	"%s: VRF: %s does not fully exist yet, delaying lookup",
	327	__PRETTY_FUNCTION__, pim->vrf->name);
	328	return -1;
	329	}
	330
d62a17ae	331	s = zlookup->obuf;
d62a17ae	332	stream_reset(s);
71edad0f	333	zclient_create_header(s, ZEBRA_IPV4_NEXTHOP_LOOKUP_MRIB, pim->vrf_id);
d62a17ae	334	stream_put_in_addr(s, &addr);
	335	stream_putw_at(s, 0, stream_get_endp(s));
	336
	337	ret = writen(zlookup->sock, s->data, stream_get_endp(s));
	338	if (ret < 0) {
af4c2728	339	flog_err(
450971aa	340	EC_LIB_SOCKET,
5cef40fc DS	341	"%s: writen() failure: %d writing to zclient lookup socket",
5cef40fc DS	342	__PRETTY_FUNCTION__, errno);
d62a17ae	343	zclient_lookup_failed(zlookup);
	344	return -2;
	345	}
	346	if (ret == 0) {
450971aa	347	flog_err_sys(EC_LIB_SOCKET,
09c866e3 QY	348	"%s: connection closed on zclient lookup socket",
09c866e3 QY	349	__PRETTY_FUNCTION__);
d62a17ae	350	zclient_lookup_failed(zlookup);
	351	return -3;
	352	}
	353
71edad0f	354	return zclient_read_nexthop(pim, zlookup, nexthop_tab, tab_size, addr);
12e41d03 DL	355	}
12e41d03 DL	356
71edad0f DS	357	int zclient_lookup_nexthop(struct pim_instance *pim,
71edad0f DS	358	struct pim_zlookup_nexthop nexthop_tab[],
d62a17ae	359	const int tab_size, struct in_addr addr,
d62a17ae	360	int max_lookup)
12e41d03	361	{
d62a17ae	362	int lookup;
	363	uint32_t route_metric = 0xFFFFFFFF;
	364	uint8_t protocol_distance = 0xFF;
	365
bfc92019	366	pim->nexthop_lookups++;
d62a17ae	367
	368	for (lookup = 0; lookup < max_lookup; ++lookup) {
	369	int num_ifindex;
	370	int first_ifindex;
	371	struct prefix nexthop_addr;
	372
71edad0f DS	373	num_ifindex = zclient_lookup_nexthop_once(pim, nexthop_tab,
71edad0f DS	374	tab_size, addr);
d62a17ae	375	if (num_ifindex < 1) {
5cef40fc	376	if (PIM_DEBUG_PIM_NHT) {
d62a17ae	377	char addr_str[INET_ADDRSTRLEN];
	378	pim_inet4_dump("<addr?>", addr, addr_str,
	379	sizeof(addr_str));
	380	zlog_debug(
5cef40fc DS	381	"%s: lookup=%d/%d: could not find nexthop ifindex for address %s(%s)",
	382	__PRETTY_FUNCTION__, lookup, max_lookup,
	383	addr_str, pim->vrf->name);
d62a17ae	384	}
	385	return -1;
	386	}
	387
	388	if (lookup < 1) {
	389	/* this is the non-recursive lookup - save original
	390	* metric/distance */
	391	route_metric = nexthop_tab[0].route_metric;
	392	protocol_distance = nexthop_tab[0].protocol_distance;
	393	}
	394
	395	/*
	396	* FIXME: Non-recursive nexthop ensured only for first ifindex.
	397	* However, recursive route lookup should really be fixed in
	398	* zebra daemon.
	399	* See also TODO T24.
	400	*
	401	* So Zebra for NEXTHOP_TYPE_IPV4 returns the ifindex now since
	402	* it was being stored. This Doesn't solve all cases of
	403	* recursive lookup but for the most common types it does.
	404	*/
	405	first_ifindex = nexthop_tab[0].ifindex;
	406	nexthop_addr = nexthop_tab[0].nexthop_addr;
	407	if (first_ifindex > 0) {
	408	/* found: first ifindex is non-recursive nexthop */
	409
	410	if (lookup > 0) {
	411	/* Report non-recursive success after first
	412	* lookup */
5cef40fc	413	if (PIM_DEBUG_PIM_NHT) {
d62a17ae	414	char addr_str[INET_ADDRSTRLEN];
	415	pim_inet4_dump("<addr?>", addr,
	416	addr_str,
	417	sizeof(addr_str));
	418	zlog_debug(
5cef40fc DS	419	"%s: lookup=%d/%d: found non-recursive ifindex=%d for address %s(%s) dist=%d met=%d",
	420	__PRETTY_FUNCTION__, lookup,
	421	max_lookup, first_ifindex,
	422	addr_str, pim->vrf->name,
d62a17ae	423	nexthop_tab[0]
	424	.protocol_distance,
	425	nexthop_tab[0].route_metric);
	426	}
	427
	428	/* use last address as nexthop address */
	429	nexthop_tab[0].nexthop_addr.u.prefix4 = addr;
	430
	431	/* report original route metric/distance */
	432	nexthop_tab[0].route_metric = route_metric;
	433	nexthop_tab[0].protocol_distance =
	434	protocol_distance;
	435	}
	436
	437	return num_ifindex;
	438	}
	439
5cef40fc	440	if (PIM_DEBUG_PIM_NHT) {
d62a17ae	441	char addr_str[INET_ADDRSTRLEN];
	442	char nexthop_str[PREFIX_STRLEN];
	443	pim_inet4_dump("<addr?>", addr, addr_str,
	444	sizeof(addr_str));
	445	pim_addr_dump("<nexthop?>", &nexthop_addr, nexthop_str,
	446	sizeof(nexthop_str));
	447	zlog_debug(
5cef40fc DS	448	"%s: lookup=%d/%d: zebra returned recursive nexthop %s for address %s(%s) dist=%d met=%d",
	449	__PRETTY_FUNCTION__, lookup, max_lookup,
	450	nexthop_str, addr_str, pim->vrf->name,
d62a17ae	451	nexthop_tab[0].protocol_distance,
	452	nexthop_tab[0].route_metric);
	453	}
	454
996c9314 LB	455	addr = nexthop_addr.u.prefix4; /* use nexthop addr for
996c9314 LB	456	recursive lookup */
d62a17ae	457
	458	} /* for (max_lookup) */
	459
5cef40fc	460	if (PIM_DEBUG_PIM_NHT) {
d62a17ae	461	char addr_str[INET_ADDRSTRLEN];
	462	pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
	463	zlog_warn(
5cef40fc DS	464	"%s: lookup=%d/%d: failure searching recursive nexthop ifindex for address %s(%s)",
	465	__PRETTY_FUNCTION__, lookup, max_lookup, addr_str,
	466	pim->vrf->name);
d5a0a629	467	}
12e41d03	468
d62a17ae	469	return -2;
12e41d03	470	}
05b0d0d0	471
d62a17ae	472	void pim_zlookup_show_ip_multicast(struct vty *vty)
05b0d0d0	473	{
d62a17ae	474	vty_out(vty, "Zclient lookup socket: ");
	475	if (zlookup) {
	476	vty_out(vty, "%d failures=%d\n", zlookup->sock, zlookup->fail);
	477	} else {
	478	vty_out(vty, "<null zclient>\n");
	479	}
05b0d0d0	480	}
e3be0432	481
d62a17ae	482	int pim_zlookup_sg_statistics(struct channel_oil *c_oil)
e3be0432	483	{
d62a17ae	484	struct stream *s = zlookup->obuf;
	485	uint16_t command = 0;
	486	unsigned long long lastused;
	487	struct prefix_sg sg;
	488	int count = 0;
	489	int ret;
	490	struct interface *ifp =
7cfc7bcf	491	pim_if_find_by_vif_index(c_oil->pim, c_oil->oil.mfcc_parent);
d62a17ae	492
	493	if (PIM_DEBUG_ZEBRA) {
	494	struct prefix_sg more;
	495
	496	more.src = c_oil->oil.mfcc_origin;
	497	more.grp = c_oil->oil.mfcc_mcastgrp;
	498	zlog_debug(
5cef40fc DS	499	"Sending Request for New Channel Oil Information(%s) VIIF %d(%s)",
	500	pim_str_sg_dump(&more), c_oil->oil.mfcc_parent,
	501	c_oil->pim->vrf->name);
d62a17ae	502	}
	503
	504	if (!ifp)
	505	return -1;
	506
	507	stream_reset(s);
71edad0f	508	zclient_create_header(s, ZEBRA_IPMR_ROUTE_STATS, c_oil->pim->vrf_id);
d62a17ae	509	stream_put_in_addr(s, &c_oil->oil.mfcc_origin);
	510	stream_put_in_addr(s, &c_oil->oil.mfcc_mcastgrp);
	511	stream_putl(s, ifp->ifindex);
	512	stream_putw_at(s, 0, stream_get_endp(s));
	513
	514	count = stream_get_endp(s);
	515	ret = writen(zlookup->sock, s->data, count);
	516	if (ret <= 0) {
af4c2728	517	flog_err(
450971aa	518	EC_LIB_SOCKET,
5cef40fc DS	519	"%s: writen() failure: %d writing to zclient lookup socket",
5cef40fc DS	520	__PRETTY_FUNCTION__, errno);
d62a17ae	521	return -1;
	522	}
	523
	524	s = zlookup->ibuf;
	525
	526	while (command != ZEBRA_IPMR_ROUTE_STATS) {
	527	int err;
	528	uint16_t length = 0;
	529	vrf_id_t vrf_id;
d7c0a89a QY	530	uint8_t marker;
d7c0a89a QY	531	uint8_t version;
d62a17ae	532
	533	stream_reset(s);
	534	err = zclient_read_header(s, zlookup->sock, &length, &marker,
	535	&version, &vrf_id, &command);
	536	if (err < 0) {
450971aa	537	flog_err(EC_LIB_ZAPI_MISSMATCH,
1c50c1c0 QY	538	"%s: zclient_read_header() failed",
1c50c1c0 QY	539	__PRETTY_FUNCTION__);
d62a17ae	540	zclient_lookup_failed(zlookup);
	541	return -1;
	542	}
	543	}
	544
	545	sg.src.s_addr = stream_get_ipv4(s);
	546	sg.grp.s_addr = stream_get_ipv4(s);
	547	if (sg.src.s_addr != c_oil->oil.mfcc_origin.s_addr
	548	\|\| sg.grp.s_addr != c_oil->oil.mfcc_mcastgrp.s_addr) {
5667319b DS	549	if (PIM_DEBUG_ZEBRA) {
	550	struct prefix_sg more;
	551
	552	more.src = c_oil->oil.mfcc_origin;
	553	more.grp = c_oil->oil.mfcc_mcastgrp;
af4c2728	554	flog_err(
450971aa	555	EC_LIB_ZAPI_MISSMATCH,
5cef40fc DS	556	"%s: Received wrong %s(%s) information requested",
	557	__PRETTY_FUNCTION__, pim_str_sg_dump(&more),
	558	c_oil->pim->vrf->name);
5667319b	559	}
d62a17ae	560	zclient_lookup_failed(zlookup);
	561	return -3;
	562	}
	563
	564	stream_get(&lastused, s, sizeof(lastused));
467c85f7	565	stream_getl(s);
d62a17ae	566
d62a17ae	567	c_oil->cc.lastused = lastused;
e3be0432	568
d62a17ae	569	return 0;
e3be0432	570	}