nm-lldp-listener.c 27.7 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 "platform/nm-platform.h"
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#include "nm-utils.h"

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#include "systemd/nm-sd.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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/*****************************************************************************/

NM_GOBJECT_PROPERTIES_DEFINE (NMLldpListener,
	PROP_NEIGHBORS,
);

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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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struct _NMLldpListener {
	GObject parent;
	NMLldpListenerPrivate _priv;
};

struct _NMLldpListenerClass {
	GObjectClass parent;
};
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G_DEFINE_TYPE (NMLldpListener, nm_lldp_listener, G_TYPE_OBJECT)

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#define NM_LLDP_LISTENER_GET_PRIVATE(self) _NM_GET_PRIVATE (self, NMLldpListener, NM_IS_LLDP_LISTENER)

/*****************************************************************************/
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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; \
            \
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            _nm_log (_level, _NMLOG_DOMAIN, 0, \
                     nm_platform_link_get_name (NM_PLATFORM_GET, _ifindex), \
                     NULL, \
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                     "%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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	NMHashState h;

	nm_hash_init (&h, 23423423u);
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	nm_hash_update_str0 (&h, neigh->chassis_id);
	nm_hash_update_str0 (&h, neigh->port_id);
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	nm_hash_update_vals (&h,
	                     neigh->chassis_id_type,
	                     neigh->port_id_type);
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	return nm_hash_complete (&h);
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}

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static int
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lldp_neighbor_id_cmp (const LldpNeighbor *x, const LldpNeighbor *y)
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{
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	NM_CMP_SELF (x, y);
	NM_CMP_FIELD (x, y, chassis_id_type);
	NM_CMP_FIELD (x, y, port_id_type);
	NM_CMP_FIELD_STR0 (x, y, chassis_id);
	NM_CMP_FIELD_STR0 (x, y, port_id);
	return 0;
}

static int
lldp_neighbor_id_cmp_p (gconstpointer a, gconstpointer b, gpointer user_data)
{
	return lldp_neighbor_id_cmp (*((const LldpNeighbor *const*) a),
	                             *((const LldpNeighbor *const*) b));
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}
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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;
537 538
				if (l > 32)
					continue;
539

540 541 542
				_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,
543
				                        &data8[3], l);
544 545 546 547 548 549 550 551
				break;
			}
			default:
				g_assert_not_reached ();
			}
		}
	} while (sd_lldp_neighbor_tlv_next (neighbor_sd) > 0);

552 553 554
	neigh->valid = TRUE;

out:
555
	return g_steal_pointer (&neigh);
556 557
}

558 559 560 561 562
static GVariant *
lldp_neighbor_to_variant (LldpNeighbor *neigh)
{
	GVariantBuilder builder;
	const char *dest_str;
563
	LldpAttrId attr_id;
564

565 566 567
	if (neigh->variant)
		return neigh->variant;

568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596
	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));
	}

597 598
	for (attr_id = 0; attr_id < _LLDP_PROP_ID_COUNT; attr_id++) {
		const LldpAttrData *data = &neigh->attrs[attr_id];
599

600 601 602
		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:
603
			g_variant_builder_add (&builder, "{sv}",
604 605 606 607
			                       _lldp_attr_id_to_name (attr_id),
			                       g_variant_new_uint32 (data->v_uint32));
			break;
		case LLDP_ATTR_TYPE_STRING:
608
			g_variant_builder_add (&builder, "{sv}",
609 610 611 612 613
			                       _lldp_attr_id_to_name (attr_id),
			                       g_variant_new_string (data->v_string));
			break;
		default:
			break;
614 615 616
		}
	}

617
	return (neigh->variant = g_variant_ref_sink (g_variant_builder_end (&builder)));
618 619
}

620 621
/*****************************************************************************/

622 623 624 625 626 627 628
static void
data_changed_notify (NMLldpListener *self, NMLldpListenerPrivate *priv)
{
	nm_clear_g_variant (&priv->variant);
	_notify (self, PROP_NEIGHBORS);
}

629
static gboolean
630
data_changed_timeout (gpointer user_data)
631
{
632 633 634 635 636 637
	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);
638

639 640 641 642 643
	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;
}
644

645 646 647 648 649 650 651 652 653 654 655 656 657 658
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);
}
659

660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705
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;
	}

706
	/* ensure that we have at most MAX_NEIGHBORS entries */
707 708 709 710 711 712 713 714 715 716 717
	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;
718
	g_hash_table_add (priv->lldp_neighbors, g_steal_pointer (&neigh));
719 720 721 722

done:
	if (changed)
		data_changed_schedule (self);
723 724 725
}

static void
726
lldp_event_handler (sd_lldp *lldp, sd_lldp_event event, sd_lldp_neighbor *n, void *userdata)
727
{
728
	process_lldp_neighbor (userdata, n, event != SD_LLDP_EVENT_REMOVED);
729 730 731
}

gboolean
732
nm_lldp_listener_start (NMLldpListener *self, int ifindex, GError **error)
733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748
{
	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;
	}

749
	ret = sd_lldp_new (&priv->lldp_handle);
750
	if (ret < 0) {
751 752 753 754 755
		g_set_error_literal (error, NM_DEVICE_ERROR, NM_DEVICE_ERROR_FAILED,
		                     "initialization failed");
		return FALSE;
	}

756 757 758 759 760 761 762
	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;
	}

763
	ret = sd_lldp_set_callback (priv->lldp_handle, lldp_event_handler, self);
764
	if (ret < 0) {
765
		g_set_error_literal (error, NM_DEVICE_ERROR, NM_DEVICE_ERROR_FAILED,
766 767
		                     "set callback failed");
		goto err;
768 769
	}

770 771 772
	priv->ifindex = ifindex;

	ret = sd_lldp_attach_event (priv->lldp_handle, NULL, 0);
773
	if (ret < 0) {
774
		g_set_error_literal (error, NM_DEVICE_ERROR, NM_DEVICE_ERROR_FAILED,
775 776
		                     "attach event failed");
		goto err_free;
777 778 779
	}

	ret = sd_lldp_start (priv->lldp_handle);
780
	if (ret < 0) {
781 782 783 784 785
		g_set_error_literal (error, NM_DEVICE_ERROR, NM_DEVICE_ERROR_FAILED,
		                     "start failed");
		goto err;
	}

786
	_LOGD ("start");
787

788 789 790 791 792
	return TRUE;

err:
	sd_lldp_detach_event (priv->lldp_handle);
err_free:
793
	sd_lldp_unref (priv->lldp_handle);
794
	priv->lldp_handle = NULL;
795
	priv->ifindex = 0;
796 797 798 799 800 801 802 803
	return FALSE;
}

void
nm_lldp_listener_stop (NMLldpListener *self)
{
	NMLldpListenerPrivate *priv;
	guint size;
804
	gboolean changed = FALSE;
805 806 807 808 809

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

	if (priv->lldp_handle) {
810
		_LOGD ("stop");
811 812
		sd_lldp_stop (priv->lldp_handle);
		sd_lldp_detach_event (priv->lldp_handle);
813
		sd_lldp_unref (priv->lldp_handle);
814 815 816 817
		priv->lldp_handle = NULL;

		size = g_hash_table_size (priv->lldp_neighbors);
		g_hash_table_remove_all (priv->lldp_neighbors);
818 819
		if (size || priv->ratelimit_id)
			changed = TRUE;
820 821
	}

822 823
	nm_clear_g_source (&priv->ratelimit_id);
	priv->ratelimit_next = 0;
824
	priv->ifindex = 0;
825 826 827

	if (changed)
		data_changed_notify (self, priv);
828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845
}

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;

846 847
	g_return_val_if_fail (NM_IS_LLDP_LISTENER (self), FALSE);

848 849
	priv = NM_LLDP_LISTENER_GET_PRIVATE (self);

850 851 852 853 854
	if (G_UNLIKELY (!priv->variant)) {
		GVariantBuilder array_builder;
		gs_free LldpNeighbor **neighbors = NULL;
		guint i, n;

855
		g_variant_builder_init (&array_builder, G_VARIANT_TYPE ("aa{sv}"));
856 857 858 859 860 861
		neighbors = (LldpNeighbor **) nm_utils_hash_keys_to_array (priv->lldp_neighbors,
		                                                           lldp_neighbor_id_cmp_p,
		                                                           NULL,
		                                                           &n);
		for (i = 0; i < n; i++)
			g_variant_builder_add_value (&array_builder, lldp_neighbor_to_variant (neighbors[i]));
862 863
		priv->variant = g_variant_ref_sink (g_variant_builder_end (&array_builder));
	}
864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889
	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,
890
	                                              (GDestroyNotify) lldp_neighbor_free, NULL);
891 892

	_LOGT ("lldp listener created");
893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919
}

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);

920 921
	_LOGT ("lldp listener destroyed");

922 923 924 925 926 927 928 929 930 931 932 933
	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);

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

934 935 936 937 938 939 940 941
	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);
942 943
}