nm-lldp-listener.c 27.2 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"

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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) {
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	case SD_LLDP_CHASSIS_SUBTYPE_INTERFACE_ALIAS:
	case SD_LLDP_CHASSIS_SUBTYPE_INTERFACE_NAME:
	case SD_LLDP_CHASSIS_SUBTYPE_LOCALLY_ASSIGNED:
	case SD_LLDP_CHASSIS_SUBTYPE_CHASSIS_COMPONENT:
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		neigh->chassis_id = g_strndup ((const char *) chassis_id, chassis_id_len);
		break;
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	case SD_LLDP_CHASSIS_SUBTYPE_MAC_ADDRESS:
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		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) {
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	case SD_LLDP_PORT_SUBTYPE_INTERFACE_ALIAS:
	case SD_LLDP_PORT_SUBTYPE_INTERFACE_NAME:
	case SD_LLDP_PORT_SUBTYPE_LOCALLY_ASSIGNED:
	case SD_LLDP_PORT_SUBTYPE_PORT_COMPONENT:
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		neigh->port_id = strndup ((char *) port_id, port_id_len);
		break;
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	case SD_LLDP_PORT_SUBTYPE_MAC_ADDRESS:
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		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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		}

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		if (!(   memcmp (oui, SD_LLDP_OUI_802_1, sizeof (oui)) == 0
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		      && NM_IN_SET (subtype,
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		                    SD_LLDP_OUI_802_1_SUBTYPE_PORT_PROTOCOL_VLAN_ID,
		                    SD_LLDP_OUI_802_1_SUBTYPE_PORT_VLAN_ID,
		                    SD_LLDP_OUI_802_1_SUBTYPE_VLAN_NAME)))
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			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;

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		/*if (memcmp (oui, SD_LLDP_OUI_802_1, sizeof (oui)) == 0)*/
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		{
			switch (subtype) {
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			case SD_LLDP_OUI_802_1_SUBTYPE_PORT_VLAN_ID:
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				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;
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			case SD_LLDP_OUI_802_1_SUBTYPE_PORT_PROTOCOL_VLAN_ID:
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				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;
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			case SD_LLDP_OUI_802_1_SUBTYPE_VLAN_NAME: {
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				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);
523 524 525 526 527 528 529 530
				break;
			}
			default:
				g_assert_not_reached ();
			}
		}
	} while (sd_lldp_neighbor_tlv_next (neighbor_sd) > 0);

531 532 533
	neigh->valid = TRUE;

out:
534
	return g_steal_pointer (&neigh);
535 536
}

537 538 539 540 541
static GVariant *
lldp_neighbor_to_variant (LldpNeighbor *neigh)
{
	GVariantBuilder builder;
	const char *dest_str;
542
	LldpAttrId attr_id;
543

544 545 546
	if (neigh->variant)
		return neigh->variant;

547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575
	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));
	}

576 577
	for (attr_id = 0; attr_id < _LLDP_PROP_ID_COUNT; attr_id++) {
		const LldpAttrData *data = &neigh->attrs[attr_id];
578

579 580 581
		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:
582
			g_variant_builder_add (&builder, "{sv}",
583 584 585 586
			                       _lldp_attr_id_to_name (attr_id),
			                       g_variant_new_uint32 (data->v_uint32));
			break;
		case LLDP_ATTR_TYPE_STRING:
587
			g_variant_builder_add (&builder, "{sv}",
588 589 590 591 592
			                       _lldp_attr_id_to_name (attr_id),
			                       g_variant_new_string (data->v_string));
			break;
		default:
			break;
593 594 595
		}
	}

596
	return (neigh->variant = g_variant_ref_sink (g_variant_builder_end (&builder)));
597 598
}

599 600
/*****************************************************************************/

601 602 603 604 605 606 607
static void
data_changed_notify (NMLldpListener *self, NMLldpListenerPrivate *priv)
{
	nm_clear_g_variant (&priv->variant);
	_notify (self, PROP_NEIGHBORS);
}

608
static gboolean
609
data_changed_timeout (gpointer user_data)
610
{
611 612 613 614 615 616
	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);
617

618 619 620 621 622
	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;
}
623

624 625 626 627 628 629 630 631 632 633 634 635 636 637
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);
}
638

639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696
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;
697
	g_hash_table_add (priv->lldp_neighbors, g_steal_pointer (&neigh));
698 699 700 701

done:
	if (changed)
		data_changed_schedule (self);
702 703 704
}

static void
705
lldp_event_handler (sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata)
706
{
707
	process_lldp_neighbor (userdata, n, event != SD_LLDP_EVENT_REMOVED);
708 709 710
}

gboolean
711
nm_lldp_listener_start (NMLldpListener *self, int ifindex, GError **error)
712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727
{
	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;
	}

728
	ret = sd_lldp_new (&priv->lldp_handle);
729
	if (ret < 0) {
730 731 732 733 734
		g_set_error_literal (error, NM_DEVICE_ERROR, NM_DEVICE_ERROR_FAILED,
		                     "initialization failed");
		return FALSE;
	}

735 736 737 738 739 740 741
	ret = sd_lldp_set_ifindex (priv->lldp_handle, ifindex);
	if (ret < 0) {
		g_set_error_literal (error, NM_DEVICE_ERROR, NM_DEVICE_ERROR_FAILED,
		                     "failed setting ifindex");
		goto err;
	}

742
	ret = sd_lldp_set_callback (priv->lldp_handle, lldp_event_handler, self);
743
	if (ret < 0) {
744
		g_set_error_literal (error, NM_DEVICE_ERROR, NM_DEVICE_ERROR_FAILED,
745 746
		                     "set callback failed");
		goto err;
747 748
	}

749 750 751
	priv->ifindex = ifindex;

	ret = sd_lldp_attach_event (priv->lldp_handle, NULL, 0);
752
	if (ret < 0) {
753
		g_set_error_literal (error, NM_DEVICE_ERROR, NM_DEVICE_ERROR_FAILED,
754 755
		                     "attach event failed");
		goto err_free;
756 757 758
	}

	ret = sd_lldp_start (priv->lldp_handle);
759
	if (ret < 0) {
760 761 762 763 764
		g_set_error_literal (error, NM_DEVICE_ERROR, NM_DEVICE_ERROR_FAILED,
		                     "start failed");
		goto err;
	}

765
	_LOGD ("start");
766

767 768 769 770 771
	return TRUE;

err:
	sd_lldp_detach_event (priv->lldp_handle);
err_free:
772
	sd_lldp_unref (priv->lldp_handle);
773
	priv->lldp_handle = NULL;
774
	priv->ifindex = 0;
775 776 777 778 779 780 781 782
	return FALSE;
}

void
nm_lldp_listener_stop (NMLldpListener *self)
{
	NMLldpListenerPrivate *priv;
	guint size;
783
	gboolean changed = FALSE;
784 785 786 787 788

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

	if (priv->lldp_handle) {
789
		_LOGD ("stop");
790 791
		sd_lldp_stop (priv->lldp_handle);
		sd_lldp_detach_event (priv->lldp_handle);
792
		sd_lldp_unref (priv->lldp_handle);
793 794 795 796
		priv->lldp_handle = NULL;

		size = g_hash_table_size (priv->lldp_neighbors);
		g_hash_table_remove_all (priv->lldp_neighbors);
797 798
		if (size || priv->ratelimit_id)
			changed = TRUE;
799 800
	}

801 802
	nm_clear_g_source (&priv->ratelimit_id);
	priv->ratelimit_next = 0;
803
	priv->ifindex = 0;
804 805 806

	if (changed)
		data_changed_notify (self, priv);
807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823
}

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;
824 825
	GVariantBuilder array_builder;
	GList *neighbors, *iter;
826

827 828
	g_return_val_if_fail (NM_IS_LLDP_LISTENER (self), FALSE);

829 830
	priv = NM_LLDP_LISTENER_GET_PRIVATE (self);

831 832
	if (!priv->variant) {
		g_variant_builder_init (&array_builder, G_VARIANT_TYPE ("aa{sv}"));
833 834 835 836 837
		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);
838 839
		priv->variant = g_variant_ref_sink (g_variant_builder_end (&array_builder));
	}
840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865
	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,
866
	                                              (GDestroyNotify) lldp_neighbor_free, NULL);
867 868

	_LOGT ("lldp listener created");
869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895
}

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);

896 897
	_LOGT ("lldp listener destroyed");

898 899 900 901 902 903 904 905 906 907 908 909 910 911
	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;

912 913 914 915 916 917 918 919
	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);
920 921
}