[mirror_frr.git] / zebra / zebra_netns_notify.c

/*
 * Zebra NS collector and notifier for Network NameSpaces
 * Copyright (C) 2017 6WIND
 *
 * 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>

#ifdef HAVE_NETLINK
#ifdef HAVE_NETNS
#undef _GNU_SOURCE
#define _GNU_SOURCE

#include <sched.h>
#endif
#include <dirent.h>
#include <sys/inotify.h>
#include <sys/stat.h>

#include "thread.h"
#include "ns.h"
#include "command.h"
#include "memory.h"
#include "lib_errors.h"

#include "zserv.h"
#include "zebra_memory.h"
#endif /* defined(HAVE_NETLINK) */

#include "zebra_netns_notify.h"
#include "zebra_netns_id.h"
#include "zebra_errors.h"

#ifdef HAVE_NETLINK

/* upon creation of folder under /var/run/netns,
 * wait that netns context is bound to
 * that folder 10 seconds
 */
#define ZEBRA_NS_POLLING_INTERVAL_MSEC     1000
#define ZEBRA_NS_POLLING_MAX_RETRIES  200

DEFINE_MTYPE_STATIC(ZEBRA, NETNS_MISC, "ZebraNetNSInfo")
static struct thread *zebra_netns_notify_current;

struct zebra_netns_info {
	const char *netnspath;
	unsigned int retries;
};

static int zebra_ns_ready_read(struct thread *t);
static void zebra_ns_notify_create_context_from_entry_name(const char *name);
static int zebra_ns_continue_read(struct zebra_netns_info *zns_info,
				  int stop_retry);
static int zebra_ns_notify_read(struct thread *t);

static void zebra_ns_notify_create_context_from_entry_name(const char *name)
{
	char *netnspath = ns_netns_pathname(NULL, name);
	struct vrf *vrf;
	int ret;
	ns_id_t ns_id, ns_id_external;

	if (netnspath == NULL)
		return;

	frr_elevate_privs(&zserv_privs) {
		ns_id = zebra_ns_id_get(netnspath);
	}
	if (ns_id == NS_UNKNOWN)
		return;
	ns_id_external = ns_map_nsid_with_external(ns_id, true);
	/* if VRF with NS ID already present */
	vrf = vrf_lookup_by_id((vrf_id_t)ns_id_external);
	if (vrf) {
		zlog_debug(
			"NS notify : same NSID used by VRF %s. Ignore NS %s creation",
			vrf->name, netnspath);
		return;
	}
	if (vrf_handler_create(NULL, name, &vrf) != CMD_SUCCESS) {
		flog_warn(EC_ZEBRA_NS_VRF_CREATION_FAILED,
			  "NS notify : failed to create VRF %s", name);
		ns_map_nsid_with_external(ns_id, false);
		return;
	}
	frr_elevate_privs(&zserv_privs) {
		ret = vrf_netns_handler_create(NULL, vrf, netnspath,
					       ns_id_external, ns_id);
	}
	if (ret != CMD_SUCCESS) {
		flog_warn(EC_ZEBRA_NS_VRF_CREATION_FAILED,
			  "NS notify : failed to create NS %s", netnspath);
		ns_map_nsid_with_external(ns_id, false);
		vrf_delete(vrf);
		return;
	}
	zlog_info("NS notify : created VRF %s NS %s", name, netnspath);
}

static int zebra_ns_continue_read(struct zebra_netns_info *zns_info,
				  int stop_retry)
{
	void *ns_path_ptr = (void *)zns_info->netnspath;

	if (stop_retry) {
		XFREE(MTYPE_NETNS_MISC, ns_path_ptr);
		XFREE(MTYPE_NETNS_MISC, zns_info);
		return 0;
	}
	thread_add_timer_msec(zebrad.master, zebra_ns_ready_read,
			      (void *)zns_info, ZEBRA_NS_POLLING_INTERVAL_MSEC,
			      NULL);
	return 0;
}

static int zebra_ns_delete(char *name)
{
	struct vrf *vrf = vrf_lookup_by_name(name);
	struct ns *ns;

	if (!vrf) {
		flog_warn(EC_ZEBRA_NS_DELETION_FAILED_NO_VRF,
			  "NS notify : no VRF found using NS %s", name);
		return 0;
	}
	/* Clear configured flag and invoke delete. */
	UNSET_FLAG(vrf->status, VRF_CONFIGURED);
	ns = (struct ns *)vrf->ns_ctxt;
	/* the deletion order is the same
	 * as the one used when siging signal is received
	 */
	vrf_delete(vrf);
	if (ns)
		ns_delete(ns);

	zlog_info("NS notify : deleted VRF %s", name);
	return 0;
}

static int zebra_ns_notify_self_identify(struct stat *netst)
{
	char net_path[64];
	int netns;

	sprintf(net_path, "/proc/self/ns/net");
	netns = open(net_path, O_RDONLY);
	if (netns < 0)
		return -1;
	if (fstat(netns, netst) < 0) {
		close(netns);
		return -1;
	}
	close(netns);
	return 0;
}

static bool zebra_ns_notify_is_default_netns(const char *name)
{
	struct stat default_netns_stat;
	struct stat st;
	char netnspath[64];

	if (zebra_ns_notify_self_identify(&default_netns_stat))
		return false;

	memset(&st, 0, sizeof(struct stat));
	snprintf(netnspath, 64, "%s/%s", NS_RUN_DIR, name);
	/* compare with local stat */
	if (stat(netnspath, &st) == 0 &&
	    (st.st_dev == default_netns_stat.st_dev) &&
	    (st.st_ino == default_netns_stat.st_ino))
		return true;
	return false;
}

static int zebra_ns_ready_read(struct thread *t)
{
	struct zebra_netns_info *zns_info = THREAD_ARG(t);
	const char *netnspath;
	int err, stop_retry = 0;

	if (!zns_info)
		return 0;
	if (!zns_info->netnspath) {
		XFREE(MTYPE_NETNS_MISC, zns_info);
		return 0;
	}
	netnspath = zns_info->netnspath;
	if (--zns_info->retries == 0)
		stop_retry = 1;
	frr_elevate_privs(&zserv_privs) {
		err = ns_switch_to_netns(netnspath);
	}
	if (err < 0)
		return zebra_ns_continue_read(zns_info, stop_retry);

	/* go back to default ns */
	frr_elevate_privs(&zserv_privs) {
		err = ns_switchback_to_initial();
	}
	if (err < 0)
		return zebra_ns_continue_read(zns_info, stop_retry);

	if (zebra_ns_notify_is_default_netns(basename(netnspath))) {
		zlog_warn(
			  "NS notify : NS %s is default VRF."
			  " Updating VRF Name", basename(netnspath));
		vrf_set_default_name(basename(netnspath), false);
		return zebra_ns_continue_read(zns_info, 1);
	}

	/* success : close fd and create zns context */
	zebra_ns_notify_create_context_from_entry_name(basename(netnspath));
	return zebra_ns_continue_read(zns_info, 1);
}

static int zebra_ns_notify_read(struct thread *t)
{
	int fd_monitor = THREAD_FD(t);
	struct inotify_event *event;
	char buf[BUFSIZ];
	ssize_t len;

	zebra_netns_notify_current = thread_add_read(
		zebrad.master, zebra_ns_notify_read, NULL, fd_monitor, NULL);
	len = read(fd_monitor, buf, sizeof(buf));
	if (len < 0) {
		flog_err_sys(EC_ZEBRA_NS_NOTIFY_READ,
			     "NS notify read: failed to read (%s)",
			     safe_strerror(errno));
		return 0;
	}
	for (event = (struct inotify_event *)buf; (char *)event < &buf[len];
	     event = (struct inotify_event *)((char *)event + sizeof(*event)
					      + event->len)) {
		char *netnspath;
		struct zebra_netns_info *netnsinfo;

		if (!(event->mask & (IN_CREATE | IN_DELETE)))
			continue;

		if (offsetof(struct inotify_event, name) + event->len
		    >= sizeof(buf)) {
			flog_err(EC_ZEBRA_NS_NOTIFY_READ,
				 "NS notify read: buffer underflow");
			break;
		}

		if (strnlen(event->name, event->len) == event->len) {
			flog_err(EC_ZEBRA_NS_NOTIFY_READ,
				 "NS notify error: bad event name");
			break;
		}

		if (event->mask & IN_DELETE)
			return zebra_ns_delete(event->name);

		netnspath = ns_netns_pathname(NULL, event->name);
		if (!netnspath)
			continue;
		netnspath = XSTRDUP(MTYPE_NETNS_MISC, netnspath);
		netnsinfo = XCALLOC(MTYPE_NETNS_MISC,
				    sizeof(struct zebra_netns_info));
		netnsinfo->retries = ZEBRA_NS_POLLING_MAX_RETRIES;
		netnsinfo->netnspath = netnspath;
		thread_add_timer_msec(zebrad.master, zebra_ns_ready_read,
				      (void *)netnsinfo, 0, NULL);
	}
	return 0;
}

void zebra_ns_notify_parse(void)
{
	struct dirent *dent;
	DIR *srcdir = opendir(NS_RUN_DIR);

	if (srcdir == NULL) {
		flog_err_sys(EC_LIB_SYSTEM_CALL,
			     "NS parsing init: failed to parse %s", NS_RUN_DIR);
		return;
	}
	while ((dent = readdir(srcdir)) != NULL) {
		struct stat st;

		if (strcmp(dent->d_name, ".") == 0
		    || strcmp(dent->d_name, "..") == 0)
			continue;
		if (fstatat(dirfd(srcdir), dent->d_name, &st, 0) < 0) {
			flog_err_sys(
				EC_LIB_SYSTEM_CALL,
				"NS parsing init: failed to parse entry %s",
				dent->d_name);
			continue;
		}
		if (S_ISDIR(st.st_mode)) {
			zlog_debug("NS parsing init: %s is not a NS",
				   dent->d_name);
			continue;
		}
		if (zebra_ns_notify_is_default_netns(dent->d_name)) {
			zlog_warn(
				  "NS notify : NS %s is default VRF."
				  " Updating VRF Name", dent->d_name);
			vrf_set_default_name(dent->d_name, false);
			continue;
		}
		zebra_ns_notify_create_context_from_entry_name(dent->d_name);
	}
	closedir(srcdir);
}

void zebra_ns_notify_init(void)
{
	int fd_monitor;

	zebra_netns_notify_current = NULL;
	fd_monitor = inotify_init();
	if (fd_monitor < 0) {
		flog_err_sys(
			EC_LIB_SYSTEM_CALL,
			"NS notify init: failed to initialize inotify (%s)",
			safe_strerror(errno));
	}
	if (inotify_add_watch(fd_monitor, NS_RUN_DIR,
			      IN_CREATE | IN_DELETE) < 0) {
		flog_err_sys(EC_LIB_SYSTEM_CALL,
			     "NS notify watch: failed to add watch (%s)",
			     safe_strerror(errno));
	}
	zebra_netns_notify_current = thread_add_read(
		zebrad.master, zebra_ns_notify_read, NULL, fd_monitor, NULL);
}

void zebra_ns_notify_close(void)
{
	if (zebra_netns_notify_current == NULL)
		return;

	int fd = 0;

	if (zebra_netns_notify_current->u.fd > 0)
		fd = zebra_netns_notify_current->u.fd;

	if (zebra_netns_notify_current->master != NULL)
		thread_cancel(zebra_netns_notify_current);

	/* auto-removal of notify items */
	if (fd > 0)
		close(fd);
}

#else
void zebra_ns_notify_parse(void)
{
}

void zebra_ns_notify_init(void)
{
}

void zebra_ns_notify_close(void)
{
}
#endif /* !HAVE_NETLINK */
Commit	Line	Data
e27dec3c PG	1	/*
	2	* Zebra NS collector and notifier for Network NameSpaces
	3	* Copyright (C) 2017 6WIND
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of the GNU General Public License as published by the Free
	7	* Software Foundation; either version 2 of the License, or (at your option)
	8	* any later version.
	9	*
	10	* This program is distributed in the hope that it will be useful, but WITHOUT
	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	13	* 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	*/
	19
	20	#include <zebra.h>
	21
	22	#ifdef HAVE_NETLINK
	23	#ifdef HAVE_NETNS
	24	#undef _GNU_SOURCE
	25	#define _GNU_SOURCE
	26
	27	#include <sched.h>
	28	#endif
	29	#include <dirent.h>
	30	#include <sys/inotify.h>
	31	#include <sys/stat.h>
	32
	33	#include "thread.h"
	34	#include "ns.h"
	35	#include "command.h"
	36	#include "memory.h"
174482ef	37	#include "lib_errors.h"
e27dec3c PG	38
	39	#include "zserv.h"
	40	#include "zebra_memory.h"
	41	#endif /* defined(HAVE_NETLINK) */
	42
	43	#include "zebra_netns_notify.h"
	44	#include "zebra_netns_id.h"
9df414fe	45	#include "zebra_errors.h"
e27dec3c PG	46
	47	#ifdef HAVE_NETLINK
	48
	49	/* upon creation of folder under /var/run/netns,
	50	* wait that netns context is bound to
	51	* that folder 10 seconds
	52	*/
	53	#define ZEBRA_NS_POLLING_INTERVAL_MSEC 1000
	54	#define ZEBRA_NS_POLLING_MAX_RETRIES 200
	55
	56	DEFINE_MTYPE_STATIC(ZEBRA, NETNS_MISC, "ZebraNetNSInfo")
	57	static struct thread *zebra_netns_notify_current;
	58
	59	struct zebra_netns_info {
	60	const char *netnspath;
	61	unsigned int retries;
	62	};
	63
	64	static int zebra_ns_ready_read(struct thread *t);
	65	static void zebra_ns_notify_create_context_from_entry_name(const char *name);
	66	static int zebra_ns_continue_read(struct zebra_netns_info *zns_info,
	67	int stop_retry);
	68	static int zebra_ns_notify_read(struct thread *t);
	69
	70	static void zebra_ns_notify_create_context_from_entry_name(const char *name)
	71	{
	72	char *netnspath = ns_netns_pathname(NULL, name);
	73	struct vrf *vrf;
	74	int ret;
03aff2d8	75	ns_id_t ns_id, ns_id_external;
e27dec3c PG	76
	77	if (netnspath == NULL)
	78	return;
	79
01b9e3fd DL	80	frr_elevate_privs(&zserv_privs) {
	81	ns_id = zebra_ns_id_get(netnspath);
	82	}
85a0edca PG	83	if (ns_id == NS_UNKNOWN)
85a0edca PG	84	return;
03aff2d8	85	ns_id_external = ns_map_nsid_with_external(ns_id, true);
b7b816df	86	/* if VRF with NS ID already present */
03aff2d8	87	vrf = vrf_lookup_by_id((vrf_id_t)ns_id_external);
b7b816df	88	if (vrf) {
9df414fe	89	zlog_debug(
996c9314 LB	90	"NS notify : same NSID used by VRF %s. Ignore NS %s creation",
996c9314 LB	91	vrf->name, netnspath);
b7b816df PG	92	return;
	93	}
	94	if (vrf_handler_create(NULL, name, &vrf) != CMD_SUCCESS) {
e914ccbe	95	flog_warn(EC_ZEBRA_NS_VRF_CREATION_FAILED,
9df414fe	96	"NS notify : failed to create VRF %s", name);
03aff2d8	97	ns_map_nsid_with_external(ns_id, false);
b7b816df PG	98	return;
b7b816df PG	99	}
01b9e3fd DL	100	frr_elevate_privs(&zserv_privs) {
	101	ret = vrf_netns_handler_create(NULL, vrf, netnspath,
	102	ns_id_external, ns_id);
	103	}
e27dec3c	104	if (ret != CMD_SUCCESS) {
e914ccbe	105	flog_warn(EC_ZEBRA_NS_VRF_CREATION_FAILED,
9df414fe	106	"NS notify : failed to create NS %s", netnspath);
03aff2d8	107	ns_map_nsid_with_external(ns_id, false);
73899a2f	108	vrf_delete(vrf);
e27dec3c PG	109	return;
e27dec3c PG	110	}
996c9314	111	zlog_info("NS notify : created VRF %s NS %s", name, netnspath);
e27dec3c PG	112	}
	113
	114	static int zebra_ns_continue_read(struct zebra_netns_info *zns_info,
	115	int stop_retry)
	116	{
	117	void ns_path_ptr = (void )zns_info->netnspath;
	118
	119	if (stop_retry) {
	120	XFREE(MTYPE_NETNS_MISC, ns_path_ptr);
	121	XFREE(MTYPE_NETNS_MISC, zns_info);
	122	return 0;
	123	}
	124	thread_add_timer_msec(zebrad.master, zebra_ns_ready_read,
996c9314 LB	125	(void *)zns_info, ZEBRA_NS_POLLING_INTERVAL_MSEC,
996c9314 LB	126	NULL);
e27dec3c PG	127	return 0;
	128	}
	129
0c902ba5 PG	130	static int zebra_ns_delete(char *name)
	131	{
	132	struct vrf *vrf = vrf_lookup_by_name(name);
	133	struct ns *ns;
	134
	135	if (!vrf) {
e914ccbe	136	flog_warn(EC_ZEBRA_NS_DELETION_FAILED_NO_VRF,
9df414fe	137	"NS notify : no VRF found using NS %s", name);
0c902ba5 PG	138	return 0;
	139	}
	140	/* Clear configured flag and invoke delete. */
	141	UNSET_FLAG(vrf->status, VRF_CONFIGURED);
	142	ns = (struct ns *)vrf->ns_ctxt;
	143	/* the deletion order is the same
	144	* as the one used when siging signal is received
	145	*/
	146	vrf_delete(vrf);
	147	if (ns)
	148	ns_delete(ns);
	149
	150	zlog_info("NS notify : deleted VRF %s", name);
	151	return 0;
	152	}
	153
3ed78e8c PG	154	static int zebra_ns_notify_self_identify(struct stat *netst)
	155	{
	156	char net_path[64];
	157	int netns;
	158
	159	sprintf(net_path, "/proc/self/ns/net");
	160	netns = open(net_path, O_RDONLY);
	161	if (netns < 0)
	162	return -1;
	163	if (fstat(netns, netst) < 0) {
	164	close(netns);
	165	return -1;
	166	}
	167	close(netns);
	168	return 0;
	169	}
	170
	171	static bool zebra_ns_notify_is_default_netns(const char *name)
	172	{
	173	struct stat default_netns_stat;
	174	struct stat st;
	175	char netnspath[64];
	176
	177	if (zebra_ns_notify_self_identify(&default_netns_stat))
	178	return false;
	179
	180	memset(&st, 0, sizeof(struct stat));
	181	snprintf(netnspath, 64, "%s/%s", NS_RUN_DIR, name);
	182	/* compare with local stat */
	183	if (stat(netnspath, &st) == 0 &&
	184	(st.st_dev == default_netns_stat.st_dev) &&
	185	(st.st_ino == default_netns_stat.st_ino))
	186	return true;
	187	return false;
	188	}
0c902ba5	189
e27dec3c PG	190	static int zebra_ns_ready_read(struct thread *t)
	191	{
	192	struct zebra_netns_info *zns_info = THREAD_ARG(t);
	193	const char *netnspath;
	194	int err, stop_retry = 0;
	195
	196	if (!zns_info)
	197	return 0;
	198	if (!zns_info->netnspath) {
	199	XFREE(MTYPE_NETNS_MISC, zns_info);
	200	return 0;
	201	}
	202	netnspath = zns_info->netnspath;
	203	if (--zns_info->retries == 0)
	204	stop_retry = 1;
01b9e3fd DL	205	frr_elevate_privs(&zserv_privs) {
	206	err = ns_switch_to_netns(netnspath);
	207	}
e27dec3c PG	208	if (err < 0)
	209	return zebra_ns_continue_read(zns_info, stop_retry);
	210
	211	/* go back to default ns */
01b9e3fd DL	212	frr_elevate_privs(&zserv_privs) {
	213	err = ns_switchback_to_initial();
	214	}
e27dec3c PG	215	if (err < 0)
	216	return zebra_ns_continue_read(zns_info, stop_retry);
	217
3ed78e8c PG	218	if (zebra_ns_notify_is_default_netns(basename(netnspath))) {
	219	zlog_warn(
	220	"NS notify : NS %s is default VRF."
	221	" Updating VRF Name", basename(netnspath));
4fe52e76	222	vrf_set_default_name(basename(netnspath), false);
3ed78e8c PG	223	return zebra_ns_continue_read(zns_info, 1);
	224	}
	225
e27dec3c PG	226	/* success : close fd and create zns context */
	227	zebra_ns_notify_create_context_from_entry_name(basename(netnspath));
	228	return zebra_ns_continue_read(zns_info, 1);
	229	}
	230
	231	static int zebra_ns_notify_read(struct thread *t)
	232	{
	233	int fd_monitor = THREAD_FD(t);
	234	struct inotify_event *event;
	235	char buf[BUFSIZ];
	236	ssize_t len;
	237
996c9314 LB	238	zebra_netns_notify_current = thread_add_read(
996c9314 LB	239	zebrad.master, zebra_ns_notify_read, NULL, fd_monitor, NULL);
e27dec3c PG	240	len = read(fd_monitor, buf, sizeof(buf));
e27dec3c PG	241	if (len < 0) {
e914ccbe	242	flog_err_sys(EC_ZEBRA_NS_NOTIFY_READ,
9df414fe QY	243	"NS notify read: failed to read (%s)",
9df414fe QY	244	safe_strerror(errno));
e27dec3c PG	245	return 0;
e27dec3c PG	246	}
996c9314 LB	247	for (event = (struct inotify_event )buf; (char )event < &buf[len];
	248	event = (struct inotify_event )((char )event + sizeof(*event)
	249	+ event->len)) {
e27dec3c PG	250	char *netnspath;
	251	struct zebra_netns_info *netnsinfo;
	252
0c902ba5	253	if (!(event->mask & (IN_CREATE \| IN_DELETE)))
e27dec3c	254	continue;
45981fda	255
	256	if (offsetof(struct inotify_event, name) + event->len
	257	>= sizeof(buf)) {
e914ccbe	258	flog_err(EC_ZEBRA_NS_NOTIFY_READ,
9df414fe	259	"NS notify read: buffer underflow");
32ac96b2	260	break;
32ac96b2	261	}
b6312ad1	262
b6312ad1	263	if (strnlen(event->name, event->len) == event->len) {
e914ccbe	264	flog_err(EC_ZEBRA_NS_NOTIFY_READ,
9df414fe	265	"NS notify error: bad event name");
b6312ad1	266	break;
	267	}
	268
01b4cb3e DS	269	if (event->mask & IN_DELETE)
	270	return zebra_ns_delete(event->name);
	271
e27dec3c PG	272	netnspath = ns_netns_pathname(NULL, event->name);
	273	if (!netnspath)
	274	continue;
	275	netnspath = XSTRDUP(MTYPE_NETNS_MISC, netnspath);
	276	netnsinfo = XCALLOC(MTYPE_NETNS_MISC,
	277	sizeof(struct zebra_netns_info));
	278	netnsinfo->retries = ZEBRA_NS_POLLING_MAX_RETRIES;
	279	netnsinfo->netnspath = netnspath;
	280	thread_add_timer_msec(zebrad.master, zebra_ns_ready_read,
996c9314	281	(void *)netnsinfo, 0, NULL);
e27dec3c PG	282	}
	283	return 0;
	284	}
	285
	286	void zebra_ns_notify_parse(void)
	287	{
	288	struct dirent *dent;
	289	DIR *srcdir = opendir(NS_RUN_DIR);
	290
	291	if (srcdir == NULL) {
450971aa	292	flog_err_sys(EC_LIB_SYSTEM_CALL,
9df414fe	293	"NS parsing init: failed to parse %s", NS_RUN_DIR);
e27dec3c PG	294	return;
	295	}
	296	while ((dent = readdir(srcdir)) != NULL) {
	297	struct stat st;
	298
	299	if (strcmp(dent->d_name, ".") == 0
996c9314	300	\|\| strcmp(dent->d_name, "..") == 0)
e27dec3c PG	301	continue;
e27dec3c PG	302	if (fstatat(dirfd(srcdir), dent->d_name, &st, 0) < 0) {
9df414fe	303	flog_err_sys(
450971aa	304	EC_LIB_SYSTEM_CALL,
9df414fe QY	305	"NS parsing init: failed to parse entry %s",
9df414fe QY	306	dent->d_name);
e27dec3c PG	307	continue;
	308	}
	309	if (S_ISDIR(st.st_mode)) {
9df414fe QY	310	zlog_debug("NS parsing init: %s is not a NS",
9df414fe QY	311	dent->d_name);
e27dec3c PG	312	continue;
e27dec3c PG	313	}
3ed78e8c PG	314	if (zebra_ns_notify_is_default_netns(dent->d_name)) {
	315	zlog_warn(
	316	"NS notify : NS %s is default VRF."
	317	" Updating VRF Name", dent->d_name);
4fe52e76	318	vrf_set_default_name(dent->d_name, false);
3ed78e8c PG	319	continue;
3ed78e8c PG	320	}
e27dec3c PG	321	zebra_ns_notify_create_context_from_entry_name(dent->d_name);
	322	}
	323	closedir(srcdir);
	324	}
	325
	326	void zebra_ns_notify_init(void)
	327	{
	328	int fd_monitor;
	329
	330	zebra_netns_notify_current = NULL;
	331	fd_monitor = inotify_init();
	332	if (fd_monitor < 0) {
9df414fe	333	flog_err_sys(
450971aa	334	EC_LIB_SYSTEM_CALL,
9df414fe QY	335	"NS notify init: failed to initialize inotify (%s)",
9df414fe QY	336	safe_strerror(errno));
e27dec3c	337	}
0c902ba5 PG	338	if (inotify_add_watch(fd_monitor, NS_RUN_DIR,
0c902ba5 PG	339	IN_CREATE \| IN_DELETE) < 0) {
450971aa	340	flog_err_sys(EC_LIB_SYSTEM_CALL,
9df414fe QY	341	"NS notify watch: failed to add watch (%s)",
9df414fe QY	342	safe_strerror(errno));
e27dec3c	343	}
996c9314 LB	344	zebra_netns_notify_current = thread_add_read(
996c9314 LB	345	zebrad.master, zebra_ns_notify_read, NULL, fd_monitor, NULL);
e27dec3c PG	346	}
	347
	348	void zebra_ns_notify_close(void)
	349	{
	350	if (zebra_netns_notify_current == NULL)
	351	return;
	352
	353	int fd = 0;
	354
	355	if (zebra_netns_notify_current->u.fd > 0)
	356	fd = zebra_netns_notify_current->u.fd;
71077c48 MS	357
	358	if (zebra_netns_notify_current->master != NULL)
	359	thread_cancel(zebra_netns_notify_current);
	360
	361	/* auto-removal of notify items */
e27dec3c PG	362	if (fd > 0)
	363	close(fd);
	364	}
	365
	366	#else
	367	void zebra_ns_notify_parse(void)
	368	{
	369	}
	370
	371	void zebra_ns_notify_init(void)
	372	{
	373	}
	374
	375	void zebra_ns_notify_close(void)
	376	{
	377	}
	378	#endif /* !HAVE_NETLINK */