[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"
#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, 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;
	}
	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;
	}

	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 = 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 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[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[64];

	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 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_with_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_with_privs(&zserv_privs) {
		err = ns_switchback_to_initial();
	}
	if (err < 0)
		return zebra_ns_continue_read(zns_info, stop_retry);

	/* 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));
		return zebra_ns_continue_read(zns_info, 1);
	}
	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(
		zrouter.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) {
			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);
	}
	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;
		}
		/* 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. 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(
		zrouter.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	38
3801e764	39	#include "zebra_router.h"
e27dec3c PG	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;
97c9e753 PG	75	ns_id_t ns_id, ns_id_external, ns_id_relative = NS_UNKNOWN;
97c9e753 PG	76	struct ns *default_ns;
e27dec3c PG	77
	78	if (netnspath == NULL)
	79	return;
	80
0cf6db21	81	frr_with_privs(&zserv_privs) {
de0ebb25	82	ns_id = zebra_ns_id_get(netnspath, -1);
01b9e3fd	83	}
85a0edca PG	84	if (ns_id == NS_UNKNOWN)
85a0edca PG	85	return;
03aff2d8	86	ns_id_external = ns_map_nsid_with_external(ns_id, true);
b7b816df	87	/* if VRF with NS ID already present */
03aff2d8	88	vrf = vrf_lookup_by_id((vrf_id_t)ns_id_external);
b7b816df	89	if (vrf) {
9df414fe	90	zlog_debug(
996c9314 LB	91	"NS notify : same NSID used by VRF %s. Ignore NS %s creation",
996c9314 LB	92	vrf->name, netnspath);
b7b816df PG	93	return;
	94	}
	95	if (vrf_handler_create(NULL, name, &vrf) != CMD_SUCCESS) {
e914ccbe	96	flog_warn(EC_ZEBRA_NS_VRF_CREATION_FAILED,
9df414fe	97	"NS notify : failed to create VRF %s", name);
03aff2d8	98	ns_map_nsid_with_external(ns_id, false);
b7b816df PG	99	return;
b7b816df PG	100	}
de0ebb25 PG	101
	102	default_ns = ns_get_default();
	103
	104	/* force kernel ns_id creation in that new vrf */
	105	frr_with_privs(&zserv_privs) {
	106	ns_switch_to_netns(netnspath);
	107	ns_id_relative = zebra_ns_id_get(NULL, default_ns->fd);
	108	ns_switchback_to_initial();
	109	}
	110
0cf6db21	111	frr_with_privs(&zserv_privs) {
01b9e3fd	112	ret = vrf_netns_handler_create(NULL, vrf, netnspath,
9d3555e0 PG	113	ns_id_external,
	114	ns_id,
	115	ns_id_relative);
01b9e3fd	116	}
e27dec3c	117	if (ret != CMD_SUCCESS) {
e914ccbe	118	flog_warn(EC_ZEBRA_NS_VRF_CREATION_FAILED,
9df414fe	119	"NS notify : failed to create NS %s", netnspath);
03aff2d8	120	ns_map_nsid_with_external(ns_id, false);
73899a2f	121	vrf_delete(vrf);
e27dec3c PG	122	return;
e27dec3c PG	123	}
996c9314	124	zlog_info("NS notify : created VRF %s NS %s", name, netnspath);
e27dec3c PG	125	}
	126
	127	static int zebra_ns_continue_read(struct zebra_netns_info *zns_info,
	128	int stop_retry)
	129	{
	130	void ns_path_ptr = (void )zns_info->netnspath;
	131
	132	if (stop_retry) {
	133	XFREE(MTYPE_NETNS_MISC, ns_path_ptr);
	134	XFREE(MTYPE_NETNS_MISC, zns_info);
	135	return 0;
	136	}
3801e764	137	thread_add_timer_msec(zrouter.master, zebra_ns_ready_read,
996c9314 LB	138	(void *)zns_info, ZEBRA_NS_POLLING_INTERVAL_MSEC,
996c9314 LB	139	NULL);
e27dec3c PG	140	return 0;
	141	}
	142
0c902ba5 PG	143	static int zebra_ns_delete(char *name)
	144	{
	145	struct vrf *vrf = vrf_lookup_by_name(name);
	146	struct ns *ns;
	147
	148	if (!vrf) {
e914ccbe	149	flog_warn(EC_ZEBRA_NS_DELETION_FAILED_NO_VRF,
9df414fe	150	"NS notify : no VRF found using NS %s", name);
0c902ba5 PG	151	return 0;
	152	}
	153	/* Clear configured flag and invoke delete. */
	154	UNSET_FLAG(vrf->status, VRF_CONFIGURED);
	155	ns = (struct ns *)vrf->ns_ctxt;
	156	/* the deletion order is the same
	157	* as the one used when siging signal is received
	158	*/
	159	vrf_delete(vrf);
	160	if (ns)
	161	ns_delete(ns);
	162
	163	zlog_info("NS notify : deleted VRF %s", name);
	164	return 0;
	165	}
	166
3ed78e8c PG	167	static int zebra_ns_notify_self_identify(struct stat *netst)
3ed78e8c PG	168	{
2b7165e7	169	char net_path[PATH_MAX];
3ed78e8c PG	170	int netns;
3ed78e8c PG	171
772270f3	172	snprintf(net_path, sizeof(net_path), "/proc/self/ns/net");
3ed78e8c PG	173	netns = open(net_path, O_RDONLY);
	174	if (netns < 0)
	175	return -1;
	176	if (fstat(netns, netst) < 0) {
	177	close(netns);
	178	return -1;
	179	}
	180	close(netns);
	181	return 0;
	182	}
	183
	184	static bool zebra_ns_notify_is_default_netns(const char *name)
	185	{
	186	struct stat default_netns_stat;
	187	struct stat st;
	188	char netnspath[64];
	189
	190	if (zebra_ns_notify_self_identify(&default_netns_stat))
	191	return false;
	192
	193	memset(&st, 0, sizeof(struct stat));
772270f3	194	snprintf(netnspath, sizeof(netnspath), "%s/%s", NS_RUN_DIR, name);
3ed78e8c PG	195	/* compare with local stat */
	196	if (stat(netnspath, &st) == 0 &&
	197	(st.st_dev == default_netns_stat.st_dev) &&
	198	(st.st_ino == default_netns_stat.st_ino))
	199	return true;
	200	return false;
	201	}
0c902ba5	202
e27dec3c PG	203	static int zebra_ns_ready_read(struct thread *t)
	204	{
	205	struct zebra_netns_info *zns_info = THREAD_ARG(t);
	206	const char *netnspath;
	207	int err, stop_retry = 0;
	208
	209	if (!zns_info)
	210	return 0;
	211	if (!zns_info->netnspath) {
	212	XFREE(MTYPE_NETNS_MISC, zns_info);
	213	return 0;
	214	}
	215	netnspath = zns_info->netnspath;
	216	if (--zns_info->retries == 0)
	217	stop_retry = 1;
0cf6db21	218	frr_with_privs(&zserv_privs) {
01b9e3fd DL	219	err = ns_switch_to_netns(netnspath);
01b9e3fd DL	220	}
e27dec3c PG	221	if (err < 0)
	222	return zebra_ns_continue_read(zns_info, stop_retry);
	223
	224	/* go back to default ns */
0cf6db21	225	frr_with_privs(&zserv_privs) {
01b9e3fd DL	226	err = ns_switchback_to_initial();
01b9e3fd DL	227	}
e27dec3c PG	228	if (err < 0)
	229	return zebra_ns_continue_read(zns_info, stop_retry);
	230
167b0889 PG	231	/* check default name is not already set */
167b0889 PG	232	if (strmatch(VRF_DEFAULT_NAME, basename(netnspath))) {
3efd0893	233	zlog_warn("NS notify : NS %s is already default VRF.Cancel VRF Creation", basename(netnspath));
167b0889 PG	234	return zebra_ns_continue_read(zns_info, 1);
167b0889 PG	235	}
3ed78e8c PG	236	if (zebra_ns_notify_is_default_netns(basename(netnspath))) {
3ed78e8c PG	237	zlog_warn(
3efd0893	238	"NS notify : NS %s is default VRF. Updating VRF Name", basename(netnspath));
4fe52e76	239	vrf_set_default_name(basename(netnspath), false);
3ed78e8c PG	240	return zebra_ns_continue_read(zns_info, 1);
	241	}
	242
e27dec3c PG	243	/* success : close fd and create zns context */
	244	zebra_ns_notify_create_context_from_entry_name(basename(netnspath));
	245	return zebra_ns_continue_read(zns_info, 1);
	246	}
	247
	248	static int zebra_ns_notify_read(struct thread *t)
	249	{
	250	int fd_monitor = THREAD_FD(t);
	251	struct inotify_event *event;
	252	char buf[BUFSIZ];
	253	ssize_t len;
	254
996c9314	255	zebra_netns_notify_current = thread_add_read(
3801e764	256	zrouter.master, zebra_ns_notify_read, NULL, fd_monitor, NULL);
e27dec3c PG	257	len = read(fd_monitor, buf, sizeof(buf));
e27dec3c PG	258	if (len < 0) {
e914ccbe	259	flog_err_sys(EC_ZEBRA_NS_NOTIFY_READ,
9df414fe QY	260	"NS notify read: failed to read (%s)",
9df414fe QY	261	safe_strerror(errno));
e27dec3c PG	262	return 0;
e27dec3c PG	263	}
996c9314 LB	264	for (event = (struct inotify_event )buf; (char )event < &buf[len];
	265	event = (struct inotify_event )((char )event + sizeof(*event)
	266	+ event->len)) {
e27dec3c PG	267	char *netnspath;
	268	struct zebra_netns_info *netnsinfo;
	269
0c902ba5	270	if (!(event->mask & (IN_CREATE \| IN_DELETE)))
e27dec3c	271	continue;
45981fda	272
	273	if (offsetof(struct inotify_event, name) + event->len
	274	>= sizeof(buf)) {
e914ccbe	275	flog_err(EC_ZEBRA_NS_NOTIFY_READ,
9df414fe	276	"NS notify read: buffer underflow");
32ac96b2	277	break;
32ac96b2	278	}
b6312ad1	279
b6312ad1	280	if (strnlen(event->name, event->len) == event->len) {
e914ccbe	281	flog_err(EC_ZEBRA_NS_NOTIFY_READ,
9df414fe	282	"NS notify error: bad event name");
b6312ad1	283	break;
	284	}
	285
f245bcae PG	286	if (event->mask & IN_DELETE) {
	287	zebra_ns_delete(event->name);
	288	continue;
	289	}
e27dec3c PG	290	netnspath = ns_netns_pathname(NULL, event->name);
	291	if (!netnspath)
	292	continue;
	293	netnspath = XSTRDUP(MTYPE_NETNS_MISC, netnspath);
	294	netnsinfo = XCALLOC(MTYPE_NETNS_MISC,
	295	sizeof(struct zebra_netns_info));
	296	netnsinfo->retries = ZEBRA_NS_POLLING_MAX_RETRIES;
	297	netnsinfo->netnspath = netnspath;
3801e764	298	thread_add_timer_msec(zrouter.master, zebra_ns_ready_read,
996c9314	299	(void *)netnsinfo, 0, NULL);
e27dec3c PG	300	}
	301	return 0;
	302	}
	303
	304	void zebra_ns_notify_parse(void)
	305	{
	306	struct dirent *dent;
	307	DIR *srcdir = opendir(NS_RUN_DIR);
	308
	309	if (srcdir == NULL) {
450971aa	310	flog_err_sys(EC_LIB_SYSTEM_CALL,
9df414fe	311	"NS parsing init: failed to parse %s", NS_RUN_DIR);
e27dec3c PG	312	return;
	313	}
	314	while ((dent = readdir(srcdir)) != NULL) {
	315	struct stat st;
	316
	317	if (strcmp(dent->d_name, ".") == 0
996c9314	318	\|\| strcmp(dent->d_name, "..") == 0)
e27dec3c PG	319	continue;
e27dec3c PG	320	if (fstatat(dirfd(srcdir), dent->d_name, &st, 0) < 0) {
9df414fe	321	flog_err_sys(
450971aa	322	EC_LIB_SYSTEM_CALL,
9df414fe QY	323	"NS parsing init: failed to parse entry %s",
9df414fe QY	324	dent->d_name);
e27dec3c PG	325	continue;
	326	}
	327	if (S_ISDIR(st.st_mode)) {
9df414fe QY	328	zlog_debug("NS parsing init: %s is not a NS",
9df414fe QY	329	dent->d_name);
e27dec3c PG	330	continue;
e27dec3c PG	331	}
167b0889 PG	332	/* check default name is not already set */
167b0889 PG	333	if (strmatch(VRF_DEFAULT_NAME, basename(dent->d_name))) {
3efd0893	334	zlog_warn("NS notify : NS %s is already default VRF.Cancel VRF Creation", dent->d_name);
167b0889 PG	335	continue;
167b0889 PG	336	}
3ed78e8c PG	337	if (zebra_ns_notify_is_default_netns(dent->d_name)) {
3ed78e8c PG	338	zlog_warn(
3efd0893	339	"NS notify : NS %s is default VRF. Updating VRF Name", dent->d_name);
4fe52e76	340	vrf_set_default_name(dent->d_name, false);
3ed78e8c PG	341	continue;
3ed78e8c PG	342	}
e27dec3c PG	343	zebra_ns_notify_create_context_from_entry_name(dent->d_name);
	344	}
	345	closedir(srcdir);
	346	}
	347
	348	void zebra_ns_notify_init(void)
	349	{
	350	int fd_monitor;
	351
	352	zebra_netns_notify_current = NULL;
	353	fd_monitor = inotify_init();
	354	if (fd_monitor < 0) {
9df414fe	355	flog_err_sys(
450971aa	356	EC_LIB_SYSTEM_CALL,
9df414fe QY	357	"NS notify init: failed to initialize inotify (%s)",
9df414fe QY	358	safe_strerror(errno));
e27dec3c	359	}
0c902ba5 PG	360	if (inotify_add_watch(fd_monitor, NS_RUN_DIR,
0c902ba5 PG	361	IN_CREATE \| IN_DELETE) < 0) {
450971aa	362	flog_err_sys(EC_LIB_SYSTEM_CALL,
9df414fe QY	363	"NS notify watch: failed to add watch (%s)",
9df414fe QY	364	safe_strerror(errno));
e27dec3c	365	}
996c9314	366	zebra_netns_notify_current = thread_add_read(
3801e764	367	zrouter.master, zebra_ns_notify_read, NULL, fd_monitor, NULL);
e27dec3c PG	368	}
	369
	370	void zebra_ns_notify_close(void)
	371	{
	372	if (zebra_netns_notify_current == NULL)
	373	return;
	374
	375	int fd = 0;
	376
	377	if (zebra_netns_notify_current->u.fd > 0)
	378	fd = zebra_netns_notify_current->u.fd;
71077c48 MS	379
	380	if (zebra_netns_notify_current->master != NULL)
	381	thread_cancel(zebra_netns_notify_current);
	382
	383	/* auto-removal of notify items */
e27dec3c PG	384	if (fd > 0)
	385	close(fd);
	386	}
	387
	388	#else
	389	void zebra_ns_notify_parse(void)
	390	{
	391	}
	392
	393	void zebra_ns_notify_init(void)
	394	{
	395	}
	396
	397	void zebra_ns_notify_close(void)
	398	{
	399	}
	400	#endif /* !HAVE_NETLINK */