nm-lldp-listener.c 27 KB
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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/* NetworkManager -- Network link manager
 *
 * 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; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Copyright (C) 2015 Red Hat, Inc.
 */

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#include "nm-default.h"
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#include "nm-lldp-listener.h"

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#include <net/ethernet.h>
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#include <errno.h>
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#include "nm-platform.h"
#include "nm-utils.h"

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#include "sd-lldp.h"

#include "nm-sd-adapt.h"
#include "lldp.h"

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#define MAX_NEIGHBORS         4096
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#define MIN_UPDATE_INTERVAL_NS (2 * NM_UTILS_NS_PER_SECOND)
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#define LLDP_MAC_NEAREST_BRIDGE          ((const struct ether_addr *) ((uint8_t[ETH_ALEN]) { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x0e }))
#define LLDP_MAC_NEAREST_NON_TPMR_BRIDGE ((const struct ether_addr *) ((uint8_t[ETH_ALEN]) { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x03 }))
#define LLDP_MAC_NEAREST_CUSTOMER_BRIDGE ((const struct ether_addr *) ((uint8_t[ETH_ALEN]) { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }))

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typedef enum {
	LLDP_ATTR_TYPE_NONE,
	LLDP_ATTR_TYPE_UINT32,
	LLDP_ATTR_TYPE_STRING,
} LldpAttrType;

typedef enum {
	/* the order of the enum values determines the order of the fields in
	 * the variant. */
	LLDP_ATTR_ID_PORT_DESCRIPTION,
	LLDP_ATTR_ID_SYSTEM_NAME,
	LLDP_ATTR_ID_SYSTEM_DESCRIPTION,
	LLDP_ATTR_ID_SYSTEM_CAPABILITIES,
	LLDP_ATTR_ID_IEEE_802_1_PVID,
	LLDP_ATTR_ID_IEEE_802_1_PPVID,
	LLDP_ATTR_ID_IEEE_802_1_PPVID_FLAGS,
	LLDP_ATTR_ID_IEEE_802_1_VID,
	LLDP_ATTR_ID_IEEE_802_1_VLAN_NAME,
	_LLDP_PROP_ID_COUNT,
} LldpAttrId;

typedef struct {
	LldpAttrType attr_type;
	union {
		guint32 v_uint32;
		char *v_string;
	};
} LldpAttrData;

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typedef struct {
	char         *iface;
	int           ifindex;
	sd_lldp      *lldp_handle;
	GHashTable   *lldp_neighbors;
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	/* the timestamp in nsec until which we delay updates. */
	gint64        ratelimit_next;
	guint         ratelimit_id;

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	GVariant     *variant;
} NMLldpListenerPrivate;

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NM_GOBJECT_PROPERTIES_DEFINE (NMLldpListener,
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	PROP_NEIGHBORS,
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);
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G_DEFINE_TYPE (NMLldpListener, nm_lldp_listener, G_TYPE_OBJECT)

#define NM_LLDP_LISTENER_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), NM_TYPE_LLDP_LISTENER, NMLldpListenerPrivate))

typedef struct {
	guint8 chassis_id_type;
	guint8 port_id_type;
	char *chassis_id;
	char *port_id;

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	struct ether_addr destination_address;
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	bool valid:1;

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	LldpAttrData attrs[_LLDP_PROP_ID_COUNT];
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	GVariant *variant;
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} LldpNeighbor;
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/*****************************************************************************/

#define _NMLOG_PREFIX_NAME                "lldp"
#define _NMLOG_DOMAIN                     LOGD_DEVICE
#define _NMLOG(level, ...) \
    G_STMT_START { \
        const NMLogLevel _level = (level); \
        \
        if (nm_logging_enabled (_level, _NMLOG_DOMAIN)) { \
            char _sbuf[64]; \
            int _ifindex = (self) ? NM_LLDP_LISTENER_GET_PRIVATE (self)->ifindex : 0; \
            \
            _nm_log (_level, _NMLOG_DOMAIN, 0, \
                     "%s%s: " _NM_UTILS_MACRO_FIRST (__VA_ARGS__), \
                     _NMLOG_PREFIX_NAME, \
                     ((_ifindex > 0) \
                        ? nm_sprintf_buf (_sbuf, "[%p,%d]", (self), _ifindex) \
                        : ((self) \
                            ? nm_sprintf_buf (_sbuf, "[%p]", (self)) \
                            : "")) \
                     _NM_UTILS_MACRO_REST (__VA_ARGS__)); \
        } \
    } G_STMT_END \

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#define LOG_NEIGH_FMT        "CHASSIS=%s%s%s PORT=%s%s%s"
#define LOG_NEIGH_ARG(neigh) NM_PRINT_FMT_QUOTE_STRING ((neigh)->chassis_id), NM_PRINT_FMT_QUOTE_STRING ((neigh)->port_id)

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/*****************************************************************************/

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static gboolean
ether_addr_equal (const struct ether_addr *a1, const struct ether_addr *a2)
{
	nm_assert (a1);
	nm_assert (a2);

	G_STATIC_ASSERT_EXPR (sizeof (*a1) == ETH_ALEN);
	return memcmp (a1, a2, ETH_ALEN) == 0;
}

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static guint32
_access_uint8 (const void *data)
{
	return *((const guint8 *) data);
}

static guint32
_access_uint16 (const void *data)
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{
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	guint16 v;
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	memcpy (&v, data, sizeof (v));
	return ntohs (v);
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}

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/*****************************************************************************/

NM_UTILS_LOOKUP_STR_DEFINE_STATIC (_lldp_attr_id_to_name, LldpAttrId,
	NM_UTILS_LOOKUP_DEFAULT_WARN (NULL),
	NM_UTILS_LOOKUP_STR_ITEM (LLDP_ATTR_ID_PORT_DESCRIPTION,        NM_LLDP_ATTR_PORT_DESCRIPTION),
	NM_UTILS_LOOKUP_STR_ITEM (LLDP_ATTR_ID_SYSTEM_NAME,             NM_LLDP_ATTR_SYSTEM_NAME),
	NM_UTILS_LOOKUP_STR_ITEM (LLDP_ATTR_ID_SYSTEM_DESCRIPTION,      NM_LLDP_ATTR_SYSTEM_DESCRIPTION),
	NM_UTILS_LOOKUP_STR_ITEM (LLDP_ATTR_ID_SYSTEM_CAPABILITIES,     NM_LLDP_ATTR_SYSTEM_CAPABILITIES),
	NM_UTILS_LOOKUP_STR_ITEM (LLDP_ATTR_ID_IEEE_802_1_PVID,         NM_LLDP_ATTR_IEEE_802_1_PVID),
	NM_UTILS_LOOKUP_STR_ITEM (LLDP_ATTR_ID_IEEE_802_1_PPVID,        NM_LLDP_ATTR_IEEE_802_1_PPVID),
	NM_UTILS_LOOKUP_STR_ITEM (LLDP_ATTR_ID_IEEE_802_1_PPVID_FLAGS,  NM_LLDP_ATTR_IEEE_802_1_PPVID_FLAGS),
	NM_UTILS_LOOKUP_STR_ITEM (LLDP_ATTR_ID_IEEE_802_1_VID,          NM_LLDP_ATTR_IEEE_802_1_VID),
	NM_UTILS_LOOKUP_STR_ITEM (LLDP_ATTR_ID_IEEE_802_1_VLAN_NAME,    NM_LLDP_ATTR_IEEE_802_1_VLAN_NAME),
	NM_UTILS_LOOKUP_ITEM_IGNORE (_LLDP_PROP_ID_COUNT),
);

_NM_UTILS_LOOKUP_DEFINE (static, _lldp_attr_id_to_type, LldpAttrId, LldpAttrType,
	NM_UTILS_LOOKUP_DEFAULT_WARN (LLDP_ATTR_TYPE_NONE),
	NM_UTILS_LOOKUP_ITEM (LLDP_ATTR_ID_PORT_DESCRIPTION,            LLDP_ATTR_TYPE_STRING),
	NM_UTILS_LOOKUP_ITEM (LLDP_ATTR_ID_SYSTEM_NAME,                 LLDP_ATTR_TYPE_STRING),
	NM_UTILS_LOOKUP_ITEM (LLDP_ATTR_ID_SYSTEM_DESCRIPTION,          LLDP_ATTR_TYPE_STRING),
	NM_UTILS_LOOKUP_ITEM (LLDP_ATTR_ID_SYSTEM_CAPABILITIES,         LLDP_ATTR_TYPE_UINT32),
	NM_UTILS_LOOKUP_ITEM (LLDP_ATTR_ID_IEEE_802_1_PVID,             LLDP_ATTR_TYPE_UINT32),
	NM_UTILS_LOOKUP_ITEM (LLDP_ATTR_ID_IEEE_802_1_PPVID,            LLDP_ATTR_TYPE_UINT32),
	NM_UTILS_LOOKUP_ITEM (LLDP_ATTR_ID_IEEE_802_1_PPVID_FLAGS,      LLDP_ATTR_TYPE_UINT32),
	NM_UTILS_LOOKUP_ITEM (LLDP_ATTR_ID_IEEE_802_1_VID,              LLDP_ATTR_TYPE_UINT32),
	NM_UTILS_LOOKUP_ITEM (LLDP_ATTR_ID_IEEE_802_1_VLAN_NAME,        LLDP_ATTR_TYPE_STRING),
	NM_UTILS_LOOKUP_ITEM_IGNORE (_LLDP_PROP_ID_COUNT),
);

static void
_lldp_attr_set_str (LldpAttrData *pdata, LldpAttrId attr_id, const char *v_string)
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{
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	nm_assert (pdata);
	nm_assert (_lldp_attr_id_to_type (attr_id) == LLDP_ATTR_TYPE_STRING);

	pdata = &pdata[attr_id];
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	/* we ignore duplicate fields silently. */
	if (pdata->attr_type != LLDP_ATTR_TYPE_NONE)
		return;
	pdata->attr_type = LLDP_ATTR_TYPE_STRING;
	pdata->v_string = g_strdup (v_string ?: "");
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}

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static void
_lldp_attr_set_str_ptr (LldpAttrData *pdata, LldpAttrId attr_id, const void *str, gsize len)
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{
	const char *s = str;
	const char *tmp;
	gsize len0 = len;
	gs_free char *str_free = NULL;
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	nm_assert (pdata);
	nm_assert (_lldp_attr_id_to_type (attr_id) == LLDP_ATTR_TYPE_STRING);

	pdata = &pdata[attr_id];

	/* we ignore duplicate fields silently. */
	if (pdata->attr_type != LLDP_ATTR_TYPE_NONE)
		return;

	pdata->attr_type = LLDP_ATTR_TYPE_STRING;
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	/* truncate at first NUL, including removing trailing NULs*/
	tmp = memchr (s, '\0', len);
	if (tmp)
		len = tmp - s;

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	if (!len) {
		pdata->v_string = g_strdup ("");
		return;
	}
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	if (len0 <= len || s[len] != '\0') {
		/* hmpf, g_strescape needs a trailing NUL. Need to clone */
		s = str_free = g_strndup (s, len);
	}

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	pdata->v_string = g_strescape (s, NULL);
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}

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static void
_lldp_attr_set_uint32 (LldpAttrData *pdata, LldpAttrId attr_id, guint32 v_uint32)
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{
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	nm_assert (pdata);
	nm_assert (_lldp_attr_id_to_type (attr_id) == LLDP_ATTR_TYPE_UINT32);
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	pdata = &pdata[attr_id];
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	/* we ignore duplicate fields silently. */
	if (pdata->attr_type != LLDP_ATTR_TYPE_NONE)
		return;
	pdata->attr_type = LLDP_ATTR_TYPE_UINT32;
	pdata->v_uint32 = v_uint32;
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}

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/*****************************************************************************/

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static guint
lldp_neighbor_id_hash (gconstpointer ptr)
{
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	const LldpNeighbor *neigh = ptr;
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	guint hash;
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	hash =   23423423u  + ((guint) (neigh->chassis_id ? g_str_hash (neigh->chassis_id) : 12321u));
	hash = (hash * 33u) + ((guint) (neigh->port_id ? g_str_hash (neigh->port_id) : 34342343u));
	hash = (hash * 33u) + ((guint) neigh->chassis_id_type);
	hash = (hash * 33u) + ((guint) neigh->port_id_type);
	return hash;
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}

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static int
lldp_neighbor_id_cmp (gconstpointer a, gconstpointer b)
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{
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	const LldpNeighbor *x = a, *y = b;
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	int c;

	if (x->chassis_id_type != y->chassis_id_type)
		return x->chassis_id_type < y->chassis_id_type ? -1 : 1;
	if (x->port_id_type != y->port_id_type)
		return x->port_id_type < y->port_id_type ? -1 : 1;
	c = g_strcmp0 (x->chassis_id, y->chassis_id);
	if (c == 0)
		c = g_strcmp0 (x->port_id, y->port_id);
	return c < 0 ? -1 : (c > 0 ? 1 : 0);
}
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static gboolean
lldp_neighbor_id_equal (gconstpointer a, gconstpointer b)
{
	return lldp_neighbor_id_cmp (a, b) == 0;
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}

static void
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lldp_neighbor_free (LldpNeighbor *neighbor)
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{
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	LldpAttrId attr_id;

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	if (neighbor) {
		g_free (neighbor->chassis_id);
		g_free (neighbor->port_id);
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		for (attr_id = 0; attr_id < _LLDP_PROP_ID_COUNT; attr_id++) {
			if (neighbor->attrs[attr_id].attr_type == LLDP_ATTR_TYPE_STRING)
				g_free (neighbor->attrs[attr_id].v_string);
		}
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		g_clear_pointer (&neighbor->variant, g_variant_unref);
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		g_slice_free (LldpNeighbor, neighbor);
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	}
}

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static void
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lldp_neighbor_freep (LldpNeighbor **ptr)
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{
	lldp_neighbor_free (*ptr);
}

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static gboolean
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lldp_neighbor_equal (LldpNeighbor *a, LldpNeighbor *b)
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{
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	LldpAttrId attr_id;
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	nm_assert (a);
	nm_assert (b);
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	if (   a->chassis_id_type != b->chassis_id_type
	    || a->port_id_type != b->port_id_type
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	    || ether_addr_equal (&a->destination_address, &b->destination_address)
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	    || !nm_streq0 (a->chassis_id, b->chassis_id)
	    || !nm_streq0 (a->port_id, b->port_id))
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		return FALSE;

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	for (attr_id = 0; attr_id < _LLDP_PROP_ID_COUNT; attr_id++) {
		if (a->attrs[attr_id].attr_type != b->attrs[attr_id].attr_type)
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			return FALSE;
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		switch (a->attrs[attr_id].attr_type) {
		case LLDP_ATTR_TYPE_UINT32:
			if (a->attrs[attr_id].v_uint32 != b->attrs[attr_id].v_uint32)
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				return FALSE;
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			break;
		case LLDP_ATTR_TYPE_STRING:
			if (!nm_streq (a->attrs[attr_id].v_string, b->attrs[attr_id].v_string))
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				return FALSE;
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			break;
		default:
			nm_assert (a->attrs[attr_id].attr_type == LLDP_ATTR_TYPE_NONE);
			break;
		}
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	}

	return TRUE;
}

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static LldpNeighbor *
lldp_neighbor_new (sd_lldp_neighbor *neighbor_sd, GError **error)
{
	nm_auto (lldp_neighbor_freep) LldpNeighbor *neigh = NULL;
	uint8_t chassis_id_type, port_id_type;
	uint16_t data16;
	uint8_t *data8;
	const void *chassis_id, *port_id;
	gsize chassis_id_len, port_id_len, len;
	const char *str;
	int r;

	r = sd_lldp_neighbor_get_chassis_id (neighbor_sd, &chassis_id_type,
	                                     &chassis_id, &chassis_id_len);
	if (r < 0) {
		g_set_error (error, NM_UTILS_ERROR, NM_UTILS_ERROR_UNKNOWN,
		             "failed reading chassis-id: %s", g_strerror (-r));
		return NULL;
	}
	if (chassis_id_len < 1) {
		g_set_error (error, NM_UTILS_ERROR, NM_UTILS_ERROR_UNKNOWN,
		             "empty chassis-id");
		return NULL;
	}

	r = sd_lldp_neighbor_get_port_id (neighbor_sd, &port_id_type,
	                                  &port_id, &port_id_len);
	if (r < 0) {
		g_set_error (error, NM_UTILS_ERROR, NM_UTILS_ERROR_UNKNOWN,
		             "failed reading port-id: %s", g_strerror (-r));
		return NULL;
	}
	if (port_id_len < 1) {
		g_set_error (error, NM_UTILS_ERROR, NM_UTILS_ERROR_UNKNOWN,
		             "empty port-id");
		return NULL;
	}

	neigh = g_slice_new0 (LldpNeighbor);
	neigh->chassis_id_type = chassis_id_type;
	neigh->port_id_type = port_id_type;

	r = sd_lldp_neighbor_get_destination_address (neighbor_sd, &neigh->destination_address);
	if (r < 0) {
		g_set_error (error, NM_UTILS_ERROR, NM_UTILS_ERROR_UNKNOWN,
		             "failed getting destination address: %s", g_strerror (-r));
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		goto out;
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	}

	switch (chassis_id_type) {
	case LLDP_CHASSIS_SUBTYPE_INTERFACE_ALIAS:
	case LLDP_CHASSIS_SUBTYPE_INTERFACE_NAME:
	case LLDP_CHASSIS_SUBTYPE_LOCALLY_ASSIGNED:
	case LLDP_CHASSIS_SUBTYPE_CHASSIS_COMPONENT:
		neigh->chassis_id = g_strndup ((const char *) chassis_id, chassis_id_len);
		break;
	case LLDP_CHASSIS_SUBTYPE_MAC_ADDRESS:
		neigh->chassis_id = nm_utils_hwaddr_ntoa (chassis_id, chassis_id_len);
		break;
	default:
		g_set_error (error, NM_UTILS_ERROR, NM_UTILS_ERROR_UNKNOWN,
		             "unsupported chassis-id type %d", chassis_id_type);
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		goto out;
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	}

	switch (port_id_type) {
	case LLDP_PORT_SUBTYPE_INTERFACE_ALIAS:
	case LLDP_PORT_SUBTYPE_INTERFACE_NAME:
	case LLDP_PORT_SUBTYPE_LOCALLY_ASSIGNED:
	case LLDP_PORT_SUBTYPE_PORT_COMPONENT:
		neigh->port_id = strndup ((char *) port_id, port_id_len);
		break;
	case LLDP_PORT_SUBTYPE_MAC_ADDRESS:
		neigh->port_id = nm_utils_hwaddr_ntoa (port_id, port_id_len);
		break;
	default:
		g_set_error (error, NM_UTILS_ERROR, NM_UTILS_ERROR_UNKNOWN,
		             "unsupported port-id type %d", port_id_type);
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		goto out;
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	}

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	if (sd_lldp_neighbor_get_port_description (neighbor_sd, &str) == 0)
		_lldp_attr_set_str (neigh->attrs, LLDP_ATTR_ID_PORT_DESCRIPTION, str);
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	if (sd_lldp_neighbor_get_system_name (neighbor_sd, &str) == 0)
		_lldp_attr_set_str (neigh->attrs, LLDP_ATTR_ID_SYSTEM_NAME, str);
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	if (sd_lldp_neighbor_get_system_description (neighbor_sd, &str) == 0)
		_lldp_attr_set_str (neigh->attrs, LLDP_ATTR_ID_SYSTEM_DESCRIPTION, str);
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	if (sd_lldp_neighbor_get_system_capabilities (neighbor_sd, &data16) == 0)
		_lldp_attr_set_uint32 (neigh->attrs, LLDP_ATTR_ID_SYSTEM_CAPABILITIES, data16);
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	r = sd_lldp_neighbor_tlv_rewind (neighbor_sd);
	if (r < 0) {
		g_set_error (error, NM_UTILS_ERROR, NM_UTILS_ERROR_UNKNOWN,
		             "failed reading tlv (rewind): %s", g_strerror (-r));
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		goto out;
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	}
	do {
		guint8 oui[3];
		guint8 subtype;

		r = sd_lldp_neighbor_tlv_get_oui (neighbor_sd, oui, &subtype);
		if (r < 0) {
			if (r == -ENXIO)
				continue;
			g_set_error (error, NM_UTILS_ERROR, NM_UTILS_ERROR_UNKNOWN,
			             "failed reading tlv: %s", g_strerror (-r));
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			goto out;
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		}

		if (!(   memcmp (oui, LLDP_OUI_802_1, sizeof (oui)) == 0
		      && NM_IN_SET (subtype,
		                    LLDP_OUI_802_1_SUBTYPE_PORT_PROTOCOL_VLAN_ID,
		                    LLDP_OUI_802_1_SUBTYPE_PORT_VLAN_ID,
		                    LLDP_OUI_802_1_SUBTYPE_VLAN_NAME)))
			continue;

		if (sd_lldp_neighbor_tlv_get_raw (neighbor_sd, (void *) &data8, &len) < 0)
			continue;

		/* skip over leading TLV, OUI and subtype */
#ifdef WITH_MORE_ASSERTS
		{
			guint8 check_hdr[] = {
				0xfe | (((len - 2) >> 8) & 0x01), ((len - 2) & 0xFF),
				oui[0], oui[1], oui[2],
				subtype
			};

			nm_assert (len > 2 + 3 +1);
			nm_assert (memcmp (data8, check_hdr, sizeof check_hdr) == 0);
		}
#endif
		if (len <= 6)
			continue;
		data8 += 6;
		len -= 6;

		/*if (memcmp (oui, LLDP_OUI_802_1, sizeof (oui)) == 0)*/
		{
			switch (subtype) {
			case LLDP_OUI_802_1_SUBTYPE_PORT_VLAN_ID:
				if (len != 2)
					continue;
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				_lldp_attr_set_uint32 (neigh->attrs, LLDP_ATTR_ID_IEEE_802_1_PVID,
				                       _access_uint16 (data8));
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				break;
			case LLDP_OUI_802_1_SUBTYPE_PORT_PROTOCOL_VLAN_ID:
				if (len != 3)
					continue;
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				_lldp_attr_set_uint32 (neigh->attrs, LLDP_ATTR_ID_IEEE_802_1_PPVID_FLAGS,
				                       _access_uint8 (&data8[0]));
				_lldp_attr_set_uint32 (neigh->attrs, LLDP_ATTR_ID_IEEE_802_1_PPVID,
				                       _access_uint16 (&data8[1]));
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				break;
			case LLDP_OUI_802_1_SUBTYPE_VLAN_NAME: {
				int l;

				if (len <= 3)
					continue;

				l = data8[2];
				if (len != 3 + l)
					continue;

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				_lldp_attr_set_uint32 (neigh->attrs, LLDP_ATTR_ID_IEEE_802_1_VID,
				                       _access_uint16 (&data8[0]));
				_lldp_attr_set_str_ptr (neigh->attrs, LLDP_ATTR_ID_IEEE_802_1_VLAN_NAME,
				                        &data8[3], len);
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				break;
			}
			default:
				g_assert_not_reached ();
			}
		}
	} while (sd_lldp_neighbor_tlv_next (neighbor_sd) > 0);

534 535 536 537
	neigh->valid = TRUE;

out:
	return nm_unauto (&neigh);
538 539
}

540 541 542 543 544
static GVariant *
lldp_neighbor_to_variant (LldpNeighbor *neigh)
{
	GVariantBuilder builder;
	const char *dest_str;
545
	LldpAttrId attr_id;
546

547 548 549
	if (neigh->variant)
		return neigh->variant;

550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578
	g_variant_builder_init (&builder, G_VARIANT_TYPE ("a{sv}"));

	g_variant_builder_add (&builder, "{sv}",
	                       NM_LLDP_ATTR_CHASSIS_ID_TYPE,
	                       g_variant_new_uint32 (neigh->chassis_id_type));
	g_variant_builder_add (&builder, "{sv}",
	                       NM_LLDP_ATTR_CHASSIS_ID,
	                       g_variant_new_string (neigh->chassis_id));
	g_variant_builder_add (&builder, "{sv}",
	                       NM_LLDP_ATTR_PORT_ID_TYPE,
	                       g_variant_new_uint32 (neigh->port_id_type));
	g_variant_builder_add (&builder, "{sv}",
	                       NM_LLDP_ATTR_PORT_ID,
	                       g_variant_new_string (neigh->port_id));

	if (ether_addr_equal (&neigh->destination_address, LLDP_MAC_NEAREST_BRIDGE))
		dest_str = NM_LLDP_DEST_NEAREST_BRIDGE;
	else if (ether_addr_equal (&neigh->destination_address, LLDP_MAC_NEAREST_NON_TPMR_BRIDGE))
		dest_str = NM_LLDP_DEST_NEAREST_NON_TPMR_BRIDGE;
	else if (ether_addr_equal (&neigh->destination_address, LLDP_MAC_NEAREST_CUSTOMER_BRIDGE))
		dest_str = NM_LLDP_DEST_NEAREST_CUSTOMER_BRIDGE;
	else
		dest_str = NULL;
	if (dest_str) {
		g_variant_builder_add (&builder, "{sv}",
		                       NM_LLDP_ATTR_DESTINATION,
		                       g_variant_new_string (dest_str));
	}

579 580
	for (attr_id = 0; attr_id < _LLDP_PROP_ID_COUNT; attr_id++) {
		const LldpAttrData *data = &neigh->attrs[attr_id];
581

582 583 584
		nm_assert (NM_IN_SET (data->attr_type, _lldp_attr_id_to_type (attr_id), LLDP_ATTR_TYPE_NONE));
		switch (data->attr_type) {
		case LLDP_ATTR_TYPE_UINT32:
585
			g_variant_builder_add (&builder, "{sv}",
586 587 588 589
			                       _lldp_attr_id_to_name (attr_id),
			                       g_variant_new_uint32 (data->v_uint32));
			break;
		case LLDP_ATTR_TYPE_STRING:
590
			g_variant_builder_add (&builder, "{sv}",
591 592 593 594 595
			                       _lldp_attr_id_to_name (attr_id),
			                       g_variant_new_string (data->v_string));
			break;
		default:
			break;
596 597 598
		}
	}

599
	return (neigh->variant = g_variant_ref_sink (g_variant_builder_end (&builder)));
600 601
}

602 603
/*****************************************************************************/

604 605 606 607 608 609 610
static void
data_changed_notify (NMLldpListener *self, NMLldpListenerPrivate *priv)
{
	nm_clear_g_variant (&priv->variant);
	_notify (self, PROP_NEIGHBORS);
}

611
static gboolean
612
data_changed_timeout (gpointer user_data)
613
{
614 615 616 617 618 619
	NMLldpListener *self = user_data;
	NMLldpListenerPrivate *priv;

	g_return_val_if_fail (NM_IS_LLDP_LISTENER (self), G_SOURCE_REMOVE);

	priv = NM_LLDP_LISTENER_GET_PRIVATE (self);
620

621 622 623 624 625
	priv->ratelimit_id = 0;
	priv->ratelimit_next = nm_utils_get_monotonic_timestamp_ns() + MIN_UPDATE_INTERVAL_NS;
	data_changed_notify (self, priv);
	return G_SOURCE_REMOVE;
}
626

627 628 629 630 631 632 633 634 635 636 637 638 639 640
static void
data_changed_schedule (NMLldpListener *self)
{
	NMLldpListenerPrivate *priv = NM_LLDP_LISTENER_GET_PRIVATE (self);
	gint64 now;

	now = nm_utils_get_monotonic_timestamp_ns ();
	if (now >= priv->ratelimit_next) {
		nm_clear_g_source (&priv->ratelimit_id);
		priv->ratelimit_next = now + MIN_UPDATE_INTERVAL_NS;
		data_changed_notify (self, priv);
	} else if (!priv->ratelimit_id)
		priv->ratelimit_id = g_timeout_add (NM_UTILS_NS_TO_MSEC_CEIL (priv->ratelimit_next - now), data_changed_timeout, self);
}
641

642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704
static void
process_lldp_neighbor (NMLldpListener *self, sd_lldp_neighbor *neighbor_sd, gboolean neighbor_valid)
{
	NMLldpListenerPrivate *priv;
	nm_auto (lldp_neighbor_freep) LldpNeighbor *neigh = NULL;
	LldpNeighbor *neigh_old;
	gs_free_error GError *parse_error = NULL;
	GError **p_parse_error;
	gboolean changed = FALSE;

	g_return_if_fail (NM_IS_LLDP_LISTENER (self));

	priv = NM_LLDP_LISTENER_GET_PRIVATE (self);

	g_return_if_fail (priv->lldp_handle);
	g_return_if_fail (neighbor_sd);

	p_parse_error = _LOGT_ENABLED () ? &parse_error : NULL;

	neigh = lldp_neighbor_new (neighbor_sd, p_parse_error);
	if (!neigh) {
		_LOGT ("process: failed to parse neighbor: %s", parse_error->message);
		return;
	}

	if (!neigh->valid)
		neighbor_valid = FALSE;

	neigh_old = g_hash_table_lookup (priv->lldp_neighbors, neigh);
	if (neigh_old) {
		if (!neighbor_valid) {
			_LOGT ("process: %s neigh: "LOG_NEIGH_FMT"%s%s%s",
			       "remove", LOG_NEIGH_ARG (neigh),
			       NM_PRINT_FMT_QUOTED (parse_error, " (failed to parse: ", parse_error->message, ")", ""));

			g_hash_table_remove (priv->lldp_neighbors, neigh_old);
			changed = TRUE;
			goto done;
		} else if (lldp_neighbor_equal (neigh_old, neigh))
			return;
	} else if (!neighbor_valid) {
		if (parse_error)
			_LOGT ("process: failed to parse neighbor: %s", parse_error->message);
		return;
	}

	/* ensure that we have at most MAX_NEIGHBORS entires */
	if (   !neigh_old /* only matters in the "add" case. */
	    && (g_hash_table_size (priv->lldp_neighbors) + 1 > MAX_NEIGHBORS)) {
		_LOGT ("process: ignore neighbor due to overall limit of %d", MAX_NEIGHBORS);
		return;
	}

	_LOGD ("process: %s neigh: "LOG_NEIGH_FMT,
	        neigh_old ? "update" : "new",
	        LOG_NEIGH_ARG (neigh));

	changed = TRUE;
	g_hash_table_add (priv->lldp_neighbors, nm_unauto (&neigh));

done:
	if (changed)
		data_changed_schedule (self);
705 706 707
}

static void
708
lldp_event_handler (sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata)
709
{
710
	process_lldp_neighbor (userdata, n, event != SD_LLDP_EVENT_REMOVED);
711 712 713
}

gboolean
714
nm_lldp_listener_start (NMLldpListener *self, int ifindex, GError **error)
715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730
{
	NMLldpListenerPrivate *priv;
	int ret;

	g_return_val_if_fail (NM_IS_LLDP_LISTENER (self), FALSE);
	g_return_val_if_fail (ifindex > 0, FALSE);
	g_return_val_if_fail (!error || !*error, FALSE);

	priv = NM_LLDP_LISTENER_GET_PRIVATE (self);

	if (priv->lldp_handle) {
		g_set_error_literal (error, NM_DEVICE_ERROR, NM_DEVICE_ERROR_FAILED,
		                     "already running");
		return FALSE;
	}

731 732
	ret = sd_lldp_new (&priv->lldp_handle, ifindex);
	if (ret < 0) {
733 734 735 736 737
		g_set_error_literal (error, NM_DEVICE_ERROR, NM_DEVICE_ERROR_FAILED,
		                     "initialization failed");
		return FALSE;
	}

738
	ret = sd_lldp_set_callback (priv->lldp_handle, lldp_event_handler, self);
739
	if (ret < 0) {
740
		g_set_error_literal (error, NM_DEVICE_ERROR, NM_DEVICE_ERROR_FAILED,
741 742
		                     "set callback failed");
		goto err;
743 744
	}

745 746 747
	priv->ifindex = ifindex;

	ret = sd_lldp_attach_event (priv->lldp_handle, NULL, 0);
748
	if (ret < 0) {
749
		g_set_error_literal (error, NM_DEVICE_ERROR, NM_DEVICE_ERROR_FAILED,
750 751
		                     "attach event failed");
		goto err_free;
752 753 754
	}

	ret = sd_lldp_start (priv->lldp_handle);
755
	if (ret < 0) {
756 757 758 759 760
		g_set_error_literal (error, NM_DEVICE_ERROR, NM_DEVICE_ERROR_FAILED,
		                     "start failed");
		goto err;
	}

761
	_LOGD ("start");
762

763 764 765 766 767
	return TRUE;

err:
	sd_lldp_detach_event (priv->lldp_handle);
err_free:
768
	sd_lldp_unref (priv->lldp_handle);
769
	priv->lldp_handle = NULL;
770
	priv->ifindex = 0;
771 772 773 774 775 776 777 778
	return FALSE;
}

void
nm_lldp_listener_stop (NMLldpListener *self)
{
	NMLldpListenerPrivate *priv;
	guint size;
779
	gboolean changed = FALSE;
780 781 782 783 784

	g_return_if_fail (NM_IS_LLDP_LISTENER (self));
	priv = NM_LLDP_LISTENER_GET_PRIVATE (self);

	if (priv->lldp_handle) {
785
		_LOGD ("stop");
786 787
		sd_lldp_stop (priv->lldp_handle);
		sd_lldp_detach_event (priv->lldp_handle);
788
		sd_lldp_unref (priv->lldp_handle);
789 790 791 792
		priv->lldp_handle = NULL;

		size = g_hash_table_size (priv->lldp_neighbors);
		g_hash_table_remove_all (priv->lldp_neighbors);
793 794
		if (size || priv->ratelimit_id)
			changed = TRUE;
795 796
	}

797 798
	nm_clear_g_source (&priv->ratelimit_id);
	priv->ratelimit_next = 0;
799
	priv->ifindex = 0;
800 801 802

	if (changed)
		data_changed_notify (self, priv);
803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819
}

gboolean
nm_lldp_listener_is_running (NMLldpListener *self)
{
	NMLldpListenerPrivate *priv;

	g_return_val_if_fail (NM_IS_LLDP_LISTENER (self), FALSE);

	priv = NM_LLDP_LISTENER_GET_PRIVATE (self);
	return !!priv->lldp_handle;
}

GVariant *
nm_lldp_listener_get_neighbors (NMLldpListener *self)
{
	NMLldpListenerPrivate *priv;
820 821
	GVariantBuilder array_builder;
	GList *neighbors, *iter;
822

823 824
	g_return_val_if_fail (NM_IS_LLDP_LISTENER (self), FALSE);

825 826
	priv = NM_LLDP_LISTENER_GET_PRIVATE (self);

827 828
	if (!priv->variant) {
		g_variant_builder_init (&array_builder, G_VARIANT_TYPE ("aa{sv}"));
829 830 831 832 833
		neighbors = g_hash_table_get_keys (priv->lldp_neighbors);
		neighbors = g_list_sort (neighbors, lldp_neighbor_id_cmp);
		for (iter = neighbors; iter; iter = iter->next)
			g_variant_builder_add_value (&array_builder, lldp_neighbor_to_variant (iter->data));
		g_list_free (neighbors);
834 835
		priv->variant = g_variant_ref_sink (g_variant_builder_end (&array_builder));
	}
836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861
	return priv->variant;
}

static void
get_property (GObject *object, guint prop_id,
              GValue *value, GParamSpec *pspec)
{
	NMLldpListener *self = NM_LLDP_LISTENER (object);

	switch (prop_id) {
	case PROP_NEIGHBORS:
		g_value_set_variant (value, nm_lldp_listener_get_neighbors (self));
		break;
	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
		break;
	}
}

static void
nm_lldp_listener_init (NMLldpListener *self)
{
	NMLldpListenerPrivate *priv = NM_LLDP_LISTENER_GET_PRIVATE (self);

	priv->lldp_neighbors = g_hash_table_new_full (lldp_neighbor_id_hash,
	                                              lldp_neighbor_id_equal,
862
	                                              (GDestroyNotify) lldp_neighbor_free, NULL);
863 864

	_LOGT ("lldp listener created");
865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891
}

NMLldpListener *
nm_lldp_listener_new (void)
{
	return (NMLldpListener *) g_object_new (NM_TYPE_LLDP_LISTENER, NULL);
}

static void
dispose (GObject *object)
{
	nm_lldp_listener_stop (NM_LLDP_LISTENER (object));

	G_OBJECT_CLASS (nm_lldp_listener_parent_class)->dispose (object);
}

static void
finalize (GObject *object)
{
	NMLldpListener *self = NM_LLDP_LISTENER (object);
	NMLldpListenerPrivate *priv = NM_LLDP_LISTENER_GET_PRIVATE (self);

	nm_lldp_listener_stop (self);
	g_hash_table_unref (priv->lldp_neighbors);

	nm_clear_g_variant (&priv->variant);

892 893
	_LOGT ("lldp listener destroyed");

894 895 896 897 898 899 900 901 902 903 904 905 906 907
	G_OBJECT_CLASS (nm_lldp_listener_parent_class)->finalize (object);
}

static void
nm_lldp_listener_class_init (NMLldpListenerClass *klass)
{
	GObjectClass *object_class = G_OBJECT_CLASS (klass);

	g_type_class_add_private (klass, sizeof (NMLldpListenerPrivate));

	object_class->dispose = dispose;
	object_class->finalize = finalize;
	object_class->get_property = get_property;

908 909 910 911 912 913 914 915
	obj_properties[PROP_NEIGHBORS] =
	    g_param_spec_variant (NM_LLDP_LISTENER_NEIGHBORS, "", "",
	                          G_VARIANT_TYPE ("aa{sv}"),
	                          NULL,
	                          G_PARAM_READABLE |
	                          G_PARAM_STATIC_STRINGS);

	g_object_class_install_properties (object_class, _PROPERTY_ENUMS_LAST, obj_properties);
916 917
}