[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 "zebra_router.h"
#endif /* defined(HAVE_NETLINK) */

#include "zebra_netns_notify.h"
#include "zebra_netns_id.h"
#include "zebra_errors.h"
#include "interface.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 void 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 void zebra_ns_notify_read(struct thread *t);

static struct vrf *vrf_handler_create(struct vty *vty, const char *vrfname)
{
	if (strlen(vrfname) > VRF_NAMSIZ) {
		flog_warn(EC_LIB_VRF_LENGTH,
			  "%% VRF name %s invalid: length exceeds %d bytes",
			  vrfname, VRF_NAMSIZ);
		return NULL;
	}

	return vrf_get(VRF_UNKNOWN, vrfname);
}

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, ns_id_relative = NS_UNKNOWN;
	struct ns *default_ns;

	if (netnspath == NULL)
		return;

	frr_with_privs(&zserv_privs) {
		ns_id = zebra_ns_id_get(netnspath, -1);
	}
	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;
	}
	vrf = vrf_handler_create(NULL, name);
	if (!vrf) {
		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;
	}

	default_ns = ns_get_default();

	/* force kernel ns_id creation in that new vrf */
	frr_with_privs(&zserv_privs) {
		ns_switch_to_netns(netnspath);
		ns_id_relative = zebra_ns_id_get(NULL, default_ns->fd);
		ns_switchback_to_initial();
	}

	frr_with_privs(&zserv_privs) {
		ret = zebra_vrf_netns_handler_create(NULL, vrf, netnspath,
						     ns_id_external, ns_id,
						     ns_id_relative);
	}
	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(zrouter.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 interface *ifp, *tmp;
	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;
	}

	/*
	 * We don't receive interface down/delete notifications from kernel
	 * when a netns is deleted. Therefore we have to manually replicate
	 * the necessary actions here.
	 */
	RB_FOREACH_SAFE (ifp, if_name_head, &vrf->ifaces_by_name, tmp) {
		if (!CHECK_FLAG(ifp->status, ZEBRA_INTERFACE_ACTIVE))
			continue;

		if (if_is_no_ptm_operative(ifp)) {
			UNSET_FLAG(ifp->flags, IFF_RUNNING);
			if_down(ifp);
		}

		UNSET_FLAG(ifp->flags, IFF_UP);
		if_delete_update(ifp);
	}

	ns = (struct ns *)vrf->ns_ctxt;
	/* the deletion order is the same
	 * as the one used when siging signal is received
	 */
	vrf->ns_ctxt = NULL;
	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[PATH_MAX];
	int netns;

	snprintf(net_path, sizeof(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[PATH_MAX];

	if (zebra_ns_notify_self_identify(&default_netns_stat))
		return false;

	memset(&st, 0, sizeof(struct stat));
	snprintf(netnspath, sizeof(netnspath), "%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 void 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;
	if (!zns_info->netnspath) {
		XFREE(MTYPE_NETNS_MISC, zns_info);
		return;
	}
	netnspath = zns_info->netnspath;
	if (--zns_info->retries == 0)
		stop_retry = 1;
	frr_with_privs(&zserv_privs) {
		err = ns_switch_to_netns(netnspath);
	}
	if (err < 0) {
		zebra_ns_continue_read(zns_info, stop_retry);
		return;
	}

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

	/* check default name is not already set */
	if (strmatch(VRF_DEFAULT_NAME, basename(netnspath))) {
		zlog_warn("NS notify : NS %s is already default VRF.Cancel VRF Creation", basename(netnspath));
		zebra_ns_continue_read(zns_info, 1);
		return;
	}
	if (zebra_ns_notify_is_default_netns(basename(netnspath))) {
		zlog_warn(
			"NS notify : NS %s is default VRF. Ignore VRF creation",
			basename(netnspath));
		zebra_ns_continue_read(zns_info, 1);
		return;
	}

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

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

	thread_add_read(zrouter.master, zebra_ns_notify_read, NULL, fd_monitor,
			&zebra_netns_notify_current);
	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;
	}
	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) {
			zebra_ns_delete(event->name);
			continue;
		}
		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(zrouter.master, zebra_ns_ready_read,
				      (void *)netnsinfo, 0, NULL);
	}
}

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;
		}
		/* check default name is not already set */
		if (strmatch(VRF_DEFAULT_NAME, basename(dent->d_name))) {
			zlog_warn("NS notify : NS %s is already default VRF.Cancel VRF Creation", dent->d_name);
			continue;
		}
		if (zebra_ns_notify_is_default_netns(dent->d_name)) {
			zlog_warn(
				"NS notify : NS %s is default VRF. Ignore VRF creation",
				dent->d_name);
			continue;
		}
		zebra_ns_notify_create_context_from_entry_name(dent->d_name);
	}
	closedir(srcdir);
}

void zebra_ns_notify_init(void)
{
	int fd_monitor;

	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));
	}
	thread_add_read(zrouter.master, zebra_ns_notify_read, NULL, fd_monitor,
			&zebra_netns_notify_current);
}

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	38
3801e764	39	#include "zebra_router.h"
e27dec3c PG	40	#endif /* defined(HAVE_NETLINK) */
	41
	42	#include "zebra_netns_notify.h"
	43	#include "zebra_netns_id.h"
9df414fe	44	#include "zebra_errors.h"
6502e5f1	45	#include "interface.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
bf8d3d6a	56	DEFINE_MTYPE_STATIC(ZEBRA, NETNS_MISC, "ZebraNetNSInfo");
e27dec3c PG	57	static struct thread *zebra_netns_notify_current;
	58
	59	struct zebra_netns_info {
	60	const char *netnspath;
	61	unsigned int retries;
	62	};
	63
cc9f21da	64	static void zebra_ns_ready_read(struct thread *t);
e27dec3c PG	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);
cc9f21da	68	static void zebra_ns_notify_read(struct thread *t);
e27dec3c	69
62d89c64 IR	70	static struct vrf vrf_handler_create(struct vty vty, const char *vrfname)
	71	{
	72	if (strlen(vrfname) > VRF_NAMSIZ) {
	73	flog_warn(EC_LIB_VRF_LENGTH,
	74	"%% VRF name %s invalid: length exceeds %d bytes",
	75	vrfname, VRF_NAMSIZ);
	76	return NULL;
	77	}
	78
	79	return vrf_get(VRF_UNKNOWN, vrfname);
	80	}
	81
e27dec3c PG	82	static void zebra_ns_notify_create_context_from_entry_name(const char *name)
	83	{
	84	char *netnspath = ns_netns_pathname(NULL, name);
	85	struct vrf *vrf;
	86	int ret;
2d4e4d39 PG	87	ns_id_t ns_id, ns_id_external, ns_id_relative = NS_UNKNOWN;
2d4e4d39 PG	88	struct ns *default_ns;
e27dec3c PG	89
	90	if (netnspath == NULL)
	91	return;
	92
0cf6db21	93	frr_with_privs(&zserv_privs) {
289b0f0d	94	ns_id = zebra_ns_id_get(netnspath, -1);
01b9e3fd	95	}
85a0edca PG	96	if (ns_id == NS_UNKNOWN)
85a0edca PG	97	return;
03aff2d8	98	ns_id_external = ns_map_nsid_with_external(ns_id, true);
b7b816df	99	/* if VRF with NS ID already present */
03aff2d8	100	vrf = vrf_lookup_by_id((vrf_id_t)ns_id_external);
b7b816df	101	if (vrf) {
9df414fe	102	zlog_debug(
996c9314 LB	103	"NS notify : same NSID used by VRF %s. Ignore NS %s creation",
996c9314 LB	104	vrf->name, netnspath);
b7b816df PG	105	return;
b7b816df PG	106	}
62d89c64 IR	107	vrf = vrf_handler_create(NULL, name);
62d89c64 IR	108	if (!vrf) {
e914ccbe	109	flog_warn(EC_ZEBRA_NS_VRF_CREATION_FAILED,
9df414fe	110	"NS notify : failed to create VRF %s", name);
03aff2d8	111	ns_map_nsid_with_external(ns_id, false);
b7b816df PG	112	return;
b7b816df PG	113	}
289b0f0d PG	114
	115	default_ns = ns_get_default();
	116
	117	/* force kernel ns_id creation in that new vrf */
	118	frr_with_privs(&zserv_privs) {
	119	ns_switch_to_netns(netnspath);
	120	ns_id_relative = zebra_ns_id_get(NULL, default_ns->fd);
	121	ns_switchback_to_initial();
	122	}
	123
0cf6db21	124	frr_with_privs(&zserv_privs) {
62d89c64 IR	125	ret = zebra_vrf_netns_handler_create(NULL, vrf, netnspath,
	126	ns_id_external, ns_id,
	127	ns_id_relative);
01b9e3fd	128	}
e27dec3c	129	if (ret != CMD_SUCCESS) {
e914ccbe	130	flog_warn(EC_ZEBRA_NS_VRF_CREATION_FAILED,
9df414fe	131	"NS notify : failed to create NS %s", netnspath);
03aff2d8	132	ns_map_nsid_with_external(ns_id, false);
73899a2f	133	vrf_delete(vrf);
e27dec3c PG	134	return;
e27dec3c PG	135	}
996c9314	136	zlog_info("NS notify : created VRF %s NS %s", name, netnspath);
e27dec3c PG	137	}
	138
	139	static int zebra_ns_continue_read(struct zebra_netns_info *zns_info,
	140	int stop_retry)
	141	{
	142	void ns_path_ptr = (void )zns_info->netnspath;
	143
	144	if (stop_retry) {
	145	XFREE(MTYPE_NETNS_MISC, ns_path_ptr);
	146	XFREE(MTYPE_NETNS_MISC, zns_info);
	147	return 0;
	148	}
3801e764	149	thread_add_timer_msec(zrouter.master, zebra_ns_ready_read,
996c9314 LB	150	(void *)zns_info, ZEBRA_NS_POLLING_INTERVAL_MSEC,
996c9314 LB	151	NULL);
e27dec3c PG	152	return 0;
	153	}
	154
0c902ba5 PG	155	static int zebra_ns_delete(char *name)
	156	{
	157	struct vrf *vrf = vrf_lookup_by_name(name);
6502e5f1	158	struct interface ifp, tmp;
0c902ba5 PG	159	struct ns *ns;
	160
	161	if (!vrf) {
e914ccbe	162	flog_warn(EC_ZEBRA_NS_DELETION_FAILED_NO_VRF,
9df414fe	163	"NS notify : no VRF found using NS %s", name);
0c902ba5 PG	164	return 0;
0c902ba5 PG	165	}
6502e5f1 IR	166
	167	/*
	168	* We don't receive interface down/delete notifications from kernel
	169	* when a netns is deleted. Therefore we have to manually replicate
	170	* the necessary actions here.
	171	*/
	172	RB_FOREACH_SAFE (ifp, if_name_head, &vrf->ifaces_by_name, tmp) {
	173	if (!CHECK_FLAG(ifp->status, ZEBRA_INTERFACE_ACTIVE))
	174	continue;
	175
	176	if (if_is_no_ptm_operative(ifp)) {
	177	UNSET_FLAG(ifp->flags, IFF_RUNNING);
	178	if_down(ifp);
	179	}
	180
	181	UNSET_FLAG(ifp->flags, IFF_UP);
	182	if_delete_update(ifp);
	183	}
	184
0c902ba5 PG	185	ns = (struct ns *)vrf->ns_ctxt;
	186	/* the deletion order is the same
	187	* as the one used when siging signal is received
	188	*/
9acc98c8	189	vrf->ns_ctxt = NULL;
0c902ba5 PG	190	vrf_delete(vrf);
	191	if (ns)
	192	ns_delete(ns);
	193
	194	zlog_info("NS notify : deleted VRF %s", name);
	195	return 0;
	196	}
	197
3ed78e8c PG	198	static int zebra_ns_notify_self_identify(struct stat *netst)
3ed78e8c PG	199	{
2b7165e7	200	char net_path[PATH_MAX];
3ed78e8c PG	201	int netns;
3ed78e8c PG	202
772270f3	203	snprintf(net_path, sizeof(net_path), "/proc/self/ns/net");
3ed78e8c PG	204	netns = open(net_path, O_RDONLY);
	205	if (netns < 0)
	206	return -1;
	207	if (fstat(netns, netst) < 0) {
	208	close(netns);
	209	return -1;
	210	}
	211	close(netns);
	212	return 0;
	213	}
	214
	215	static bool zebra_ns_notify_is_default_netns(const char *name)
	216	{
	217	struct stat default_netns_stat;
	218	struct stat st;
f177a83e	219	char netnspath[PATH_MAX];
3ed78e8c PG	220
	221	if (zebra_ns_notify_self_identify(&default_netns_stat))
	222	return false;
	223
	224	memset(&st, 0, sizeof(struct stat));
772270f3	225	snprintf(netnspath, sizeof(netnspath), "%s/%s", NS_RUN_DIR, name);
3ed78e8c PG	226	/* compare with local stat */
	227	if (stat(netnspath, &st) == 0 &&
	228	(st.st_dev == default_netns_stat.st_dev) &&
	229	(st.st_ino == default_netns_stat.st_ino))
	230	return true;
	231	return false;
	232	}
0c902ba5	233
cc9f21da	234	static void zebra_ns_ready_read(struct thread *t)
e27dec3c PG	235	{
	236	struct zebra_netns_info *zns_info = THREAD_ARG(t);
	237	const char *netnspath;
	238	int err, stop_retry = 0;
	239
	240	if (!zns_info)
cc9f21da	241	return;
e27dec3c PG	242	if (!zns_info->netnspath) {
e27dec3c PG	243	XFREE(MTYPE_NETNS_MISC, zns_info);
cc9f21da	244	return;
e27dec3c PG	245	}
	246	netnspath = zns_info->netnspath;
	247	if (--zns_info->retries == 0)
	248	stop_retry = 1;
0cf6db21	249	frr_with_privs(&zserv_privs) {
01b9e3fd DL	250	err = ns_switch_to_netns(netnspath);
01b9e3fd DL	251	}
cc9f21da DS	252	if (err < 0) {
	253	zebra_ns_continue_read(zns_info, stop_retry);
	254	return;
	255	}
e27dec3c PG	256
e27dec3c PG	257	/* go back to default ns */
0cf6db21	258	frr_with_privs(&zserv_privs) {
01b9e3fd DL	259	err = ns_switchback_to_initial();
01b9e3fd DL	260	}
cc9f21da DS	261	if (err < 0) {
	262	zebra_ns_continue_read(zns_info, stop_retry);
	263	return;
	264	}
e27dec3c	265
167b0889 PG	266	/* check default name is not already set */
167b0889 PG	267	if (strmatch(VRF_DEFAULT_NAME, basename(netnspath))) {
3efd0893	268	zlog_warn("NS notify : NS %s is already default VRF.Cancel VRF Creation", basename(netnspath));
cc9f21da DS	269	zebra_ns_continue_read(zns_info, 1);
cc9f21da DS	270	return;
167b0889	271	}
3ed78e8c PG	272	if (zebra_ns_notify_is_default_netns(basename(netnspath))) {
3ed78e8c PG	273	zlog_warn(
ac2cb9bf IR	274	"NS notify : NS %s is default VRF. Ignore VRF creation",
ac2cb9bf IR	275	basename(netnspath));
cc9f21da DS	276	zebra_ns_continue_read(zns_info, 1);
cc9f21da DS	277	return;
3ed78e8c PG	278	}
3ed78e8c PG	279
e27dec3c PG	280	/* success : close fd and create zns context */
e27dec3c PG	281	zebra_ns_notify_create_context_from_entry_name(basename(netnspath));
cc9f21da	282	zebra_ns_continue_read(zns_info, 1);
e27dec3c PG	283	}
e27dec3c PG	284
cc9f21da	285	static void zebra_ns_notify_read(struct thread *t)
e27dec3c PG	286	{
	287	int fd_monitor = THREAD_FD(t);
	288	struct inotify_event *event;
	289	char buf[BUFSIZ];
	290	ssize_t len;
	291
ee1455dd IR	292	thread_add_read(zrouter.master, zebra_ns_notify_read, NULL, fd_monitor,
ee1455dd IR	293	&zebra_netns_notify_current);
e27dec3c PG	294	len = read(fd_monitor, buf, sizeof(buf));
e27dec3c PG	295	if (len < 0) {
e914ccbe	296	flog_err_sys(EC_ZEBRA_NS_NOTIFY_READ,
9df414fe QY	297	"NS notify read: failed to read (%s)",
9df414fe QY	298	safe_strerror(errno));
cc9f21da	299	return;
e27dec3c	300	}
996c9314 LB	301	for (event = (struct inotify_event )buf; (char )event < &buf[len];
	302	event = (struct inotify_event )((char )event + sizeof(*event)
	303	+ event->len)) {
e27dec3c PG	304	char *netnspath;
	305	struct zebra_netns_info *netnsinfo;
	306
0c902ba5	307	if (!(event->mask & (IN_CREATE \| IN_DELETE)))
e27dec3c	308	continue;
45981fda	309
	310	if (offsetof(struct inotify_event, name) + event->len
	311	>= sizeof(buf)) {
e914ccbe	312	flog_err(EC_ZEBRA_NS_NOTIFY_READ,
9df414fe	313	"NS notify read: buffer underflow");
32ac96b2	314	break;
32ac96b2	315	}
b6312ad1	316
b6312ad1	317	if (strnlen(event->name, event->len) == event->len) {
e914ccbe	318	flog_err(EC_ZEBRA_NS_NOTIFY_READ,
9df414fe	319	"NS notify error: bad event name");
b6312ad1	320	break;
	321	}
	322
f245bcae PG	323	if (event->mask & IN_DELETE) {
	324	zebra_ns_delete(event->name);
	325	continue;
	326	}
e27dec3c PG	327	netnspath = ns_netns_pathname(NULL, event->name);
	328	if (!netnspath)
	329	continue;
	330	netnspath = XSTRDUP(MTYPE_NETNS_MISC, netnspath);
	331	netnsinfo = XCALLOC(MTYPE_NETNS_MISC,
	332	sizeof(struct zebra_netns_info));
	333	netnsinfo->retries = ZEBRA_NS_POLLING_MAX_RETRIES;
	334	netnsinfo->netnspath = netnspath;
3801e764	335	thread_add_timer_msec(zrouter.master, zebra_ns_ready_read,
996c9314	336	(void *)netnsinfo, 0, NULL);
e27dec3c	337	}
e27dec3c PG	338	}
	339
	340	void zebra_ns_notify_parse(void)
	341	{
	342	struct dirent *dent;
	343	DIR *srcdir = opendir(NS_RUN_DIR);
	344
	345	if (srcdir == NULL) {
450971aa	346	flog_err_sys(EC_LIB_SYSTEM_CALL,
9df414fe	347	"NS parsing init: failed to parse %s", NS_RUN_DIR);
e27dec3c PG	348	return;
	349	}
	350	while ((dent = readdir(srcdir)) != NULL) {
	351	struct stat st;
	352
	353	if (strcmp(dent->d_name, ".") == 0
996c9314	354	\|\| strcmp(dent->d_name, "..") == 0)
e27dec3c PG	355	continue;
e27dec3c PG	356	if (fstatat(dirfd(srcdir), dent->d_name, &st, 0) < 0) {
9df414fe	357	flog_err_sys(
450971aa	358	EC_LIB_SYSTEM_CALL,
9df414fe QY	359	"NS parsing init: failed to parse entry %s",
9df414fe QY	360	dent->d_name);
e27dec3c PG	361	continue;
	362	}
	363	if (S_ISDIR(st.st_mode)) {
9df414fe QY	364	zlog_debug("NS parsing init: %s is not a NS",
9df414fe QY	365	dent->d_name);
e27dec3c PG	366	continue;
e27dec3c PG	367	}
167b0889 PG	368	/* check default name is not already set */
167b0889 PG	369	if (strmatch(VRF_DEFAULT_NAME, basename(dent->d_name))) {
3efd0893	370	zlog_warn("NS notify : NS %s is already default VRF.Cancel VRF Creation", dent->d_name);
167b0889 PG	371	continue;
167b0889 PG	372	}
3ed78e8c PG	373	if (zebra_ns_notify_is_default_netns(dent->d_name)) {
3ed78e8c PG	374	zlog_warn(
ac2cb9bf IR	375	"NS notify : NS %s is default VRF. Ignore VRF creation",
ac2cb9bf IR	376	dent->d_name);
3ed78e8c PG	377	continue;
3ed78e8c PG	378	}
e27dec3c PG	379	zebra_ns_notify_create_context_from_entry_name(dent->d_name);
	380	}
	381	closedir(srcdir);
	382	}
	383
	384	void zebra_ns_notify_init(void)
	385	{
	386	int fd_monitor;
	387
e27dec3c PG	388	fd_monitor = inotify_init();
e27dec3c PG	389	if (fd_monitor < 0) {
9df414fe	390	flog_err_sys(
450971aa	391	EC_LIB_SYSTEM_CALL,
9df414fe QY	392	"NS notify init: failed to initialize inotify (%s)",
9df414fe QY	393	safe_strerror(errno));
e27dec3c	394	}
0c902ba5 PG	395	if (inotify_add_watch(fd_monitor, NS_RUN_DIR,
0c902ba5 PG	396	IN_CREATE \| IN_DELETE) < 0) {
450971aa	397	flog_err_sys(EC_LIB_SYSTEM_CALL,
9df414fe QY	398	"NS notify watch: failed to add watch (%s)",
9df414fe QY	399	safe_strerror(errno));
e27dec3c	400	}
ee1455dd IR	401	thread_add_read(zrouter.master, zebra_ns_notify_read, NULL, fd_monitor,
ee1455dd IR	402	&zebra_netns_notify_current);
e27dec3c PG	403	}
	404
	405	void zebra_ns_notify_close(void)
	406	{
	407	if (zebra_netns_notify_current == NULL)
	408	return;
	409
	410	int fd = 0;
	411
	412	if (zebra_netns_notify_current->u.fd > 0)
	413	fd = zebra_netns_notify_current->u.fd;
71077c48 MS	414
71077c48 MS	415	if (zebra_netns_notify_current->master != NULL)
b3d6bc6e	416	thread_cancel(&zebra_netns_notify_current);
71077c48 MS	417
71077c48 MS	418	/* auto-removal of notify items */
e27dec3c PG	419	if (fd > 0)
	420	close(fd);
	421	}
	422
	423	#else
	424	void zebra_ns_notify_parse(void)
	425	{
	426	}
	427
	428	void zebra_ns_notify_init(void)
	429	{
	430	}
	431
	432	void zebra_ns_notify_close(void)
	433	{
	434	}
	435	#endif /* !HAVE_NETLINK */