nm-default-route-manager.c 32 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) 2014 Red Hat, Inc.
 */


#include "config.h"

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#include "nm-default-route-manager.h"

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#include "string.h"

#include "nm-logging.h"
#include "nm-device.h"
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#include "nm-vpn-connection.h"
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#include "nm-platform.h"
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#include "nm-manager.h"
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#include "nm-ip4-config.h"
#include "nm-ip6-config.h"
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#include "nm-activation-request.h"
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typedef struct {
	GPtrArray *entries_ip4;
	GPtrArray *entries_ip6;
} NMDefaultRouteManagerPrivate;

#define NM_DEFAULT_ROUTE_MANAGER_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), NM_TYPE_DEFAULT_ROUTE_MANAGER, NMDefaultRouteManagerPrivate))

G_DEFINE_TYPE (NMDefaultRouteManager, nm_default_route_manager, G_TYPE_OBJECT)

static NMDefaultRouteManager *_instance;

#define _LOG(level, addr_family, ...) \
    G_STMT_START { \
        int __addr_family = (addr_family); \
        guint64 __domain = __addr_family == AF_INET ? LOGD_IP4 : LOGD_IP6; \
        \
        if (nm_logging_enabled ((level), (__domain))) { \
            char __ch = __addr_family == AF_INET ? '4' : '6'; \
            char __prefix[30] = "default-route"; \
            \
            if ((self) != _instance) \
                g_snprintf (__prefix, sizeof (__prefix), "default-route%c[%p]", __ch, (self)); \
            else \
                __prefix[STRLEN ("default-route")] = __ch; \
            nm_log ((level), (__domain), \
                    "%s: " _NM_UTILS_MACRO_FIRST(__VA_ARGS__), \
                    __prefix _NM_UTILS_MACRO_REST(__VA_ARGS__)); \
        } \
    } G_STMT_END

#define _LOGD(addr_family, ...)      _LOG (LOGL_DEBUG, addr_family, __VA_ARGS__)
#define _LOGI(addr_family, ...)      _LOG (LOGL_INFO , addr_family, __VA_ARGS__)
#define _LOGW(addr_family, ...)      _LOG (LOGL_WARN , addr_family, __VA_ARGS__)
#define _LOGE(addr_family, ...)      _LOG (LOGL_ERR  , addr_family, __VA_ARGS__)

#define LOG_ENTRY_FMT  "entry[%u/%s:%p:%s]"
#define LOG_ENTRY_ARGS(entry_idx, entry) \
		entry_idx, \
		NM_IS_DEVICE (entry->source.pointer) ? "dev" : "vpn", \
		entry->source.pointer, \
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		NM_IS_DEVICE (entry->source.pointer) ? nm_device_get_iface (entry->source.device) : nm_vpn_connection_get_connection_id (entry->source.vpn)
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/***********************************************************************************/

typedef struct {
	union {
		void *pointer;
		GObject *object;
		NMDevice *device;
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		NMVpnConnection *vpn;
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	} source;
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	NMPlatformIPXRoute route;
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	gboolean synced; /* if true, we synced the entry to platform. We don't sync assumed devices */
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	/* it makes sense to order sources based on their priority, without
	 * actually adding a default route. This is useful to decide which
	 * DNS server to prefer. never_default entries are not synced to platform. */
	gboolean never_default;

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	guint32 effective_metric;
} Entry;

typedef struct {
	int addr_family;
	GPtrArray *(*get_entries) (NMDefaultRouteManagerPrivate *priv);
	const char *(*platform_route_to_string) (const NMPlatformIPRoute *route);
	gboolean (*platform_route_delete_default) (int ifindex, guint32 metric);
	guint32 (*route_metric_normalize) (guint32 metric);
} VTableIP;

static const VTableIP vtable_ip4, vtable_ip6;

#define VTABLE_IS_IP4 (vtable->addr_family == AF_INET)

static void
_entry_free (Entry *entry)
{
	if (entry) {
		g_object_unref (entry->source.object);
		g_slice_free (Entry, entry);
	}
}

static Entry *
_entry_find_by_source (GPtrArray *entries, gpointer source, guint *out_idx)
{
	guint i;

	for (i = 0; i < entries->len; i++) {
		Entry *e = g_ptr_array_index (entries, i);

		if (e->source.pointer == source) {
			if (out_idx)
				*out_idx = i;
			return e;
		}
	}

	if (out_idx)
		*out_idx = G_MAXUINT;
	return NULL;
}

static void
_platform_route_sync_add (const VTableIP *vtable, NMDefaultRouteManager *self, guint32 metric)
{
	NMDefaultRouteManagerPrivate *priv = NM_DEFAULT_ROUTE_MANAGER_GET_PRIVATE (self);
	GPtrArray *entries = vtable->get_entries (priv);
	guint i;
	gboolean has_unsynced_entry = FALSE;
	Entry *entry = NULL;
	gboolean success;

	/* Find the entries for the given metric.
	 * The effective metric for synced entries is choosen in a way that it
	 * is unique (except for G_MAXUINT32, where a clash is not solvable). */
	for (i = 0; i < entries->len; i++) {
		Entry *e = g_ptr_array_index (entries, i);

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		if (e->never_default)
			continue;

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		if (e->effective_metric != metric)
			continue;

		if (e->synced) {
			g_assert (!entry || metric == G_MAXUINT32);
			entry = e;
		} else
			has_unsynced_entry = TRUE;
	}

	/* For synced entries, we expect that the metric is chosen uniquely. */
	g_assert (!entry || !has_unsynced_entry || metric == G_MAXUINT32);

	/* we only add the route, if we have an (to be synced) entry for it. */
	if (!entry)
		return;

	if (VTABLE_IS_IP4) {
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		success = nm_platform_ip4_route_add (entry->route.rx.ifindex,
		                                     entry->route.rx.source,
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		                                     0,
		                                     0,
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		                                     entry->route.r4.gateway,
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		                                     entry->effective_metric,
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		                                     entry->route.rx.mss);
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	} else {
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		success = nm_platform_ip6_route_add (entry->route.rx.ifindex,
		                                     entry->route.rx.source,
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		                                     in6addr_any,
		                                     0,
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		                                     entry->route.r6.gateway,
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		                                     entry->effective_metric,
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		                                     entry->route.rx.mss);
	}
	if (!success) {
		_LOGW (vtable->addr_family, "failed to add default route %s with effective metric %u",
		       vtable->platform_route_to_string (&entry->route.rx), (guint) entry->effective_metric);
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	}
}

static void
_platform_route_sync_flush (const VTableIP *vtable, NMDefaultRouteManager *self)
{
	NMDefaultRouteManagerPrivate *priv = NM_DEFAULT_ROUTE_MANAGER_GET_PRIVATE (self);
	GPtrArray *entries = vtable->get_entries (priv);
	GArray *routes;
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	guint i, j;
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	/* prune all other default routes from this device. */
	if (VTABLE_IS_IP4)
		routes = nm_platform_ip4_route_get_all (0, NM_PLATFORM_GET_ROUTE_MODE_ONLY_DEFAULT);
	else
		routes = nm_platform_ip6_route_get_all (0, NM_PLATFORM_GET_ROUTE_MODE_ONLY_DEFAULT);

	for (i = 0; i < routes->len; i++) {
		const NMPlatformIPRoute *route;
		gboolean has_ifindex_synced = FALSE;
		Entry *entry = NULL;

		if (VTABLE_IS_IP4)
			route = (const NMPlatformIPRoute *) &g_array_index (routes, NMPlatformIP4Route, i);
		else
			route = (const NMPlatformIPRoute *) &g_array_index (routes, NMPlatformIP6Route, i);

		/* look at all entires and see if the route for this ifindex pair is
		 * a known entry. */
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		for (j = 0; j < entries->len; j++) {
			Entry *e = g_ptr_array_index (entries, j);
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			if (e->never_default)
				continue;

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			if (   e->route.rx.ifindex == route->ifindex
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			    && e->synced) {
				has_ifindex_synced = TRUE;
				if (e->effective_metric == route->metric)
					entry = e;
			}
		}

		/* we only delete the route if we don't have a matching entry,
		 * and there is at least one entry that references this ifindex
		 * (indicating that the ifindex is managed by us -- not assumed).
		 *
		 * Otherwise, don't delete the route because it's configured
		 * externally (and will be assumed -- or already is assumed).
		 */
		if (has_ifindex_synced && !entry)
			vtable->platform_route_delete_default (route->ifindex, route->metric);
	}
	g_array_free (routes, TRUE);
}

static int
_sort_entries_cmp (gconstpointer a, gconstpointer b, gpointer user_data)
{
	guint32 m_a, m_b;
	const Entry *e_a = *((const Entry **) a);
	const Entry *e_b = *((const Entry **) b);

	/* when comparing routes, we consider the (original) metric. */
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	m_a = e_a->route.rx.metric;
	m_b = e_b->route.rx.metric;
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	/* we normalize route.metric already in _ipx_update_default_route().
	 * so we can just compare the metrics numerically */

	if (m_a != m_b)
		return (m_a < m_b) ? -1 : 1;

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	/* If the metrics are equal, we prefer the one that is !never_default */
	if (!!e_a->never_default != !!e_b->never_default)
		return e_a->never_default ? 1 : -1;

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	/* If the metrics are equal, we prefer the one that is assumed (!synced).
	 * Entries that we sync, can be modified so that only the best
	 * entry has a (deterministically) lowest metric.
	 * With assumed devices we cannot increase/change the metric.
	 * For example: two devices, both metric 0. One is assumed the other is
	 * synced.
	 * If we would choose the synced entry as best, we cannot
	 * increase the metric of the assumed one and we would have non-determinism.
	 * If we instead prefer the assumed device, we can increase the metric
	 * of the synced device and the assumed device is (deterministically)
	 * prefered.
	 * If both devices are assumed, we also have non-determinism, but also
	 * we don't reorder either.
	 */
	if (!!e_a->synced != !!e_b->synced)
		return e_a->synced ? 1 : -1;

	/* otherwise, do not reorder */
	return 0;
}

static void
_resync_all (const VTableIP *vtable, NMDefaultRouteManager *self, const Entry *changed_entry, const Entry *old_entry, gboolean do_sync)
{
	NMDefaultRouteManagerPrivate *priv = NM_DEFAULT_ROUTE_MANAGER_GET_PRIVATE (self);
	Entry *entry;
	guint i;
	gint64 last_metric = -1;
	guint32 expected_metric;
	GPtrArray *entries;
	GHashTableIter iter;
	gpointer ptr;
	GHashTable *changed_metrics = g_hash_table_new (NULL, NULL);

	entries = vtable->get_entries (priv);

	if (old_entry && old_entry->synced) {
		/* The old version obviously changed. */
		g_hash_table_add (changed_metrics, GUINT_TO_POINTER (old_entry->effective_metric));
	}

	/* first iterate over all entries and adjust the effective metrics. */
	for (i = 0; i < entries->len; i++) {
		entry = g_ptr_array_index (entries, i);

		g_assert (entry != old_entry);

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		if (entry->never_default)
			continue;

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		if (!entry->synced) {
			last_metric = MAX (last_metric, (gint64) entry->effective_metric);
			continue;
		}

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		expected_metric = entry->route.rx.metric;
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		if ((gint64) expected_metric <= last_metric)
			expected_metric = last_metric == G_MAXUINT32 ? G_MAXUINT32 : last_metric + 1;

		if (changed_entry == entry) {
			/* for the changed entry, the previous metric was either old_entry->effective_metric,
			 * or none. Hence, we only have to remember what is going to change. */
			g_hash_table_add (changed_metrics, GUINT_TO_POINTER (expected_metric));
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			if (old_entry) {
				_LOGD (vtable->addr_family, LOG_ENTRY_FMT": update %s (%u -> %u)", LOG_ENTRY_ARGS (i, entry),
				       vtable->platform_route_to_string (&entry->route.rx), (guint) old_entry->effective_metric,
				       (guint) expected_metric);
			} else {
				_LOGD (vtable->addr_family, LOG_ENTRY_FMT": add %s (%u)", LOG_ENTRY_ARGS (i, entry),
				       vtable->platform_route_to_string (&entry->route.rx), (guint) expected_metric);
			}
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		} else if (entry->effective_metric != expected_metric) {
			g_hash_table_add (changed_metrics, GUINT_TO_POINTER (entry->effective_metric));
			g_hash_table_add (changed_metrics, GUINT_TO_POINTER (expected_metric));
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			_LOGD (vtable->addr_family, LOG_ENTRY_FMT": resync metric %s (%u -> %u)", LOG_ENTRY_ARGS (i, entry),
			       vtable->platform_route_to_string (&entry->route.rx), (guint) entry->effective_metric,
			       (guint) expected_metric);
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		}

		entry->effective_metric = expected_metric;
		last_metric = expected_metric;
	}

	if (do_sync) {
		g_hash_table_iter_init (&iter, changed_metrics);
		while (g_hash_table_iter_next (&iter, &ptr, NULL))
			_platform_route_sync_add (vtable, self, GPOINTER_TO_UINT (ptr));
		_platform_route_sync_flush (vtable, self);
	}

	g_hash_table_unref (changed_metrics);
}

static void
_entry_at_idx_update (const VTableIP *vtable, NMDefaultRouteManager *self, guint entry_idx, const Entry *old_entry, gboolean do_sync)
{
	NMDefaultRouteManagerPrivate *priv = NM_DEFAULT_ROUTE_MANAGER_GET_PRIVATE (self);
	Entry *entry;
	GPtrArray *entries;

	entries = vtable->get_entries (priv);
	g_assert (entry_idx < entries->len);

	entry = g_ptr_array_index (entries, entry_idx);

	g_assert (   !old_entry
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	          || (entry->source.pointer == old_entry->source.pointer && entry->route.rx.ifindex == old_entry->route.rx.ifindex));
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	if (!entry->synced) {
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		entry->effective_metric = entry->route.rx.metric;
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		_LOGD (vtable->addr_family, LOG_ENTRY_FMT": %s %s%s",
		       LOG_ENTRY_ARGS (entry_idx, entry),
		       old_entry ? "update" : "add",
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		       vtable->platform_route_to_string (&entry->route.rx),
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		       entry->never_default ? " (never-default)" : (entry->synced ? "" : " (not synced)"));
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	}

	g_ptr_array_sort_with_data (entries, _sort_entries_cmp, NULL);

	_resync_all (vtable, self, entry, old_entry, do_sync);
}

static void
_entry_at_idx_remove (const VTableIP *vtable, NMDefaultRouteManager *self, guint entry_idx, gboolean do_sync)
{
	NMDefaultRouteManagerPrivate *priv = NM_DEFAULT_ROUTE_MANAGER_GET_PRIVATE (self);
	Entry *entry;
	GPtrArray *entries;

	entries = vtable->get_entries (priv);

	g_assert (entry_idx < entries->len);

	entry = g_ptr_array_index (entries, entry_idx);

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	_LOGD (vtable->addr_family, LOG_ENTRY_FMT": remove %s (%u%s)", LOG_ENTRY_ARGS (entry_idx, entry),
	       vtable->platform_route_to_string (&entry->route.rx), (guint) entry->effective_metric,
	       entry->synced ? "" : ", not synced");
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	/* Remove the entry from the list (but don't free it yet) */
	g_ptr_array_index (entries, entry_idx) = NULL;
	g_ptr_array_remove_index (entries, entry_idx);

	_resync_all (vtable, self, NULL, entry, do_sync);

	_entry_free (entry);
}

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

static void
_ipx_update_default_route (const VTableIP *vtable, NMDefaultRouteManager *self, gpointer source)
{
	NMDefaultRouteManagerPrivate *priv;
	Entry *entry;
	guint entry_idx;
	const NMPlatformIPRoute *default_route = NULL;
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	NMPlatformIPXRoute rt;
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	int ip_ifindex;
	GPtrArray *entries;
	NMDevice *device = NULL;
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	NMVpnConnection *vpn = NULL;
	gboolean never_default = FALSE;
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	gboolean synced;

	g_return_if_fail (NM_IS_DEFAULT_ROUTE_MANAGER (self));
	if (NM_IS_DEVICE (source))
		device = source;
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	else if (NM_IS_VPN_CONNECTION (source))
		vpn = source;
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	else
		g_return_if_reached ();

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	if (device)
		ip_ifindex = nm_device_get_ip_ifindex (device);
	else {
		ip_ifindex = nm_vpn_connection_get_ip_ifindex (vpn);

		if (ip_ifindex <= 0) {
			NMDevice *parent = nm_active_connection_get_device (NM_ACTIVE_CONNECTION (vpn));

			if (parent)
				ip_ifindex = nm_device_get_ip_ifindex (parent);
		}
	}
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	priv = NM_DEFAULT_ROUTE_MANAGER_GET_PRIVATE (self);

	entries = vtable->get_entries (priv);
	entry = _entry_find_by_source (entries, source, &entry_idx);

	if (   entry
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	    && entry->route.rx.ifindex != ip_ifindex) {
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		/* Strange... the ifindex changed... Remove the device and start again. */
		_LOGD (vtable->addr_family, "ifindex of "LOG_ENTRY_FMT" changed: %d -> %d",
		       LOG_ENTRY_ARGS (entry_idx, entry),
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		       entry->route.rx.ifindex, ip_ifindex);
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		g_object_freeze_notify (G_OBJECT (self));
		_entry_at_idx_remove (vtable, self, entry_idx, FALSE);
		g_assert (!_entry_find_by_source (entries, source, NULL));
		_ipx_update_default_route (vtable, self, source);
		g_object_thaw_notify (G_OBJECT (self));
		return;
	}

	/* get the @default_route from the device. */
	if (ip_ifindex > 0) {
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		if (device) {
			if (VTABLE_IS_IP4)
				default_route = (const NMPlatformIPRoute *) nm_device_get_ip4_default_route (device);
			else
				default_route = (const NMPlatformIPRoute *) nm_device_get_ip6_default_route (device);
		} else {
			NMConnection *connection = nm_active_connection_get_connection ((NMActiveConnection *) vpn);

			if (   connection
			    && nm_vpn_connection_get_vpn_state (vpn) == NM_VPN_CONNECTION_STATE_ACTIVATED) {

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				memset (&rt, 0, sizeof (rt));
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				if (VTABLE_IS_IP4) {
					NMIP4Config *vpn_config;

					vpn_config = nm_vpn_connection_get_ip4_config (vpn);
					if (vpn_config) {
						never_default = nm_ip4_config_get_never_default (vpn_config);
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						rt.r4.ifindex = ip_ifindex;
						rt.r4.source = NM_IP_CONFIG_SOURCE_VPN;
						rt.r4.gateway = nm_vpn_connection_get_ip4_internal_gateway (vpn);
						rt.r4.metric = nm_vpn_connection_get_ip4_route_metric (vpn);
						rt.r4.mss = nm_ip4_config_get_mss (vpn_config);
						default_route = &rt.rx;
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					}
				} else {
					NMIP6Config *vpn_config;

					vpn_config = nm_vpn_connection_get_ip6_config (vpn);
					if (vpn_config) {
						const struct in6_addr *int_gw = nm_vpn_connection_get_ip6_internal_gateway (vpn);

						never_default = nm_ip6_config_get_never_default (vpn_config);
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						rt.r6.ifindex = ip_ifindex;
						rt.r6.source = NM_IP_CONFIG_SOURCE_VPN;
						rt.r6.gateway = int_gw ? *int_gw : in6addr_any;
						rt.r6.metric = nm_vpn_connection_get_ip6_route_metric (vpn);
						rt.r6.mss = nm_ip6_config_get_mss (vpn_config);
						default_route = &rt.rx;
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					}
				}
			}
		}
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	}
	g_assert (!default_route || default_route->plen == 0);

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	/* if the source is never_default or the device uses an assumed connection,
	 * we don't sync the route. */
	synced = !never_default && (!device || !nm_device_uses_assumed_connection (device));
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	if (!entry && !default_route)
		/* nothing to do */;
	else if (!entry) {
		/* add */
		entry = g_slice_new0 (Entry);
		entry->source.object = g_object_ref (source);

		if (VTABLE_IS_IP4)
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			entry->route.r4 = *((const NMPlatformIP4Route *) default_route);
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		else
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			entry->route.r6 = *((const NMPlatformIP6Route *) default_route);
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		/* only use normalized metrics */
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		entry->route.rx.metric = vtable->route_metric_normalize (entry->route.rx.metric);
		entry->route.rx.ifindex = ip_ifindex;
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		entry->never_default = never_default;
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		entry->effective_metric = entry->route.rx.metric;
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		entry->synced = synced;

		g_ptr_array_add (entries, entry);
		_entry_at_idx_update (vtable, self, entries->len - 1, NULL, TRUE);
	} else if (default_route) {
		/* update */
		Entry old_entry, new_entry;

		new_entry = *entry;
		if (VTABLE_IS_IP4)
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			new_entry.route.r4 = *((const NMPlatformIP4Route *) default_route);
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		else
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			new_entry.route.r6 = *((const NMPlatformIP6Route *) default_route);
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		/* only use normalized metrics */
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		new_entry.route.rx.metric = vtable->route_metric_normalize (new_entry.route.rx.metric);
		new_entry.route.rx.ifindex = ip_ifindex;
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		new_entry.never_default = never_default;
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		new_entry.synced = synced;

		if (memcmp (entry, &new_entry, sizeof (new_entry)) == 0)
			return;

		old_entry = *entry;
		*entry = new_entry;
		_entry_at_idx_update (vtable, self, entry_idx, &old_entry, TRUE);
	} else {
		/* delete */
		_entry_at_idx_remove (vtable, self, entry_idx, TRUE);
	}
}

void
nm_default_route_manager_ip4_update_default_route (NMDefaultRouteManager *self, gpointer source)
{
	_ipx_update_default_route (&vtable_ip4, self, source);
}

void
nm_default_route_manager_ip6_update_default_route (NMDefaultRouteManager *self, gpointer source)
{
	_ipx_update_default_route (&vtable_ip6, self, source);
}

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

static void
_ipx_remove_default_route (const VTableIP *vtable, NMDefaultRouteManager *self, gpointer source)
{
	NMDefaultRouteManagerPrivate *priv;
	guint entry_idx;

	g_return_if_fail (NM_IS_DEFAULT_ROUTE_MANAGER (self));
600
	g_return_if_fail (NM_IS_DEVICE (source) || NM_IS_VPN_CONNECTION (source));
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	priv = NM_DEFAULT_ROUTE_MANAGER_GET_PRIVATE (self);

	if (_entry_find_by_source (vtable->get_entries (priv), source, &entry_idx))
		_entry_at_idx_remove (vtable, self, entry_idx, TRUE);
}

void
nm_default_route_manager_ip4_remove_default_route (NMDefaultRouteManager *self, gpointer source)
{
	_ipx_remove_default_route (&vtable_ip4, self, source);
}

void
nm_default_route_manager_ip6_remove_default_route (NMDefaultRouteManager *self, gpointer source)
{
	_ipx_remove_default_route (&vtable_ip6, self, source);
}

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

static gboolean
_ipx_connection_has_default_route (const VTableIP *vtable, NMDefaultRouteManager *self, NMConnection *connection)
{
	const char *method;
	NMSettingIPConfig *s_ip;

	g_return_val_if_fail (NM_IS_DEFAULT_ROUTE_MANAGER (self), FALSE);
	g_return_val_if_fail (NM_IS_CONNECTION (connection), FALSE);

	if (VTABLE_IS_IP4)
		s_ip = nm_connection_get_setting_ip4_config (connection);
	else
		s_ip = nm_connection_get_setting_ip6_config (connection);
	if (!s_ip || nm_setting_ip_config_get_never_default (s_ip))
		return FALSE;

	if (VTABLE_IS_IP4) {
		method = nm_utils_get_ip_config_method (connection, NM_TYPE_SETTING_IP4_CONFIG);
		if (   !method
		    || !strcmp (method, NM_SETTING_IP4_CONFIG_METHOD_DISABLED)
		    || !strcmp (method, NM_SETTING_IP4_CONFIG_METHOD_LINK_LOCAL))
			return FALSE;
	} else {
		method = nm_utils_get_ip_config_method (connection, NM_TYPE_SETTING_IP6_CONFIG);
		if (   !method
		    || !strcmp (method, NM_SETTING_IP6_CONFIG_METHOD_IGNORE)
		    || !strcmp (method, NM_SETTING_IP6_CONFIG_METHOD_LINK_LOCAL))
			return FALSE;
	}

	return TRUE;
}

gboolean
nm_default_route_manager_ip4_connection_has_default_route (NMDefaultRouteManager *self, NMConnection *connection)
{
	return _ipx_connection_has_default_route (&vtable_ip4, self, connection);
}

gboolean
nm_default_route_manager_ip6_connection_has_default_route (NMDefaultRouteManager *self, NMConnection *connection)
{
	return _ipx_connection_has_default_route (&vtable_ip6, self, connection);
}

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

669
static NMDevice *
670
_ipx_get_best_device (const VTableIP *vtable, NMDefaultRouteManager *self, const GSList *devices)
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{
	NMDefaultRouteManagerPrivate *priv;
	GPtrArray *entries;
	guint i;

	g_return_val_if_fail (NM_IS_DEFAULT_ROUTE_MANAGER (self), NULL);

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	if (!devices)
		return NULL;

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	priv = NM_DEFAULT_ROUTE_MANAGER_GET_PRIVATE (self);
	entries = vtable->get_entries (priv);

	for (i = 0; i < entries->len; i++) {
		Entry *entry = g_ptr_array_index (entries, i);

		if (!NM_IS_DEVICE (entry->source.pointer))
			continue;

		g_assert (!entry->never_default);
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		if (g_slist_find ((GSList *) devices, entry->source.device))
			return entry->source.pointer;
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	}
	return NULL;
}

/** _ipx_get_best_activating_device:
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 * @vtable: the virtual table
 * @self: #NMDefaultRouteManager
 * @devices: list of devices to be searched. Only devices from this list will be considered
 * @fully_activated: if #TRUE, only search for devices that are fully activated. Otherwise,
 *   search if there is a best device going to be activated. In the latter case, this will
 *   return NULL if the best device is already activated.
 * @preferred_device: if not-NULL, this device is preferred if there are more devices with
 *   the same priority.
 **/
static NMDevice *
709
_ipx_get_best_activating_device (const VTableIP *vtable, NMDefaultRouteManager *self, const GSList *devices, NMDevice *preferred_device)
710
{
711
	NMDefaultRouteManagerPrivate *priv;
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	const GSList *iter;
	NMDevice *best_device = NULL;
	guint32 best_prio = G_MAXUINT32;
715
	NMDevice *best_activated_device;
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	g_return_val_if_fail (NM_IS_DEFAULT_ROUTE_MANAGER (self), NULL);

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	priv = NM_DEFAULT_ROUTE_MANAGER_GET_PRIVATE (self);

721
	best_activated_device = _ipx_get_best_device (vtable, self, devices);
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723 724 725
	for (iter = devices; iter; iter = g_slist_next (iter)) {
		NMDevice *device = NM_DEVICE (iter->data);
		guint32 prio;
726
		Entry *entry;
727

728
		entry = _entry_find_by_source (vtable->get_entries (priv), device, NULL);
729

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		if (entry) {
			/* of all the device that have an entry, we already know that best_activated_device
			 * is the best. entry cannot be better. */
			if (entry->source.device != best_activated_device)
				continue;
			prio = entry->effective_metric;
		} else {
			NMDeviceState state = nm_device_get_state (device);
738

739 740 741
			if (   state <= NM_DEVICE_STATE_DISCONNECTED
			    || state >= NM_DEVICE_STATE_DEACTIVATING)
				continue;
742

743 744
			if (!_ipx_connection_has_default_route (vtable, self, nm_device_get_connection (device)))
				continue;
745

746
			prio = nm_device_get_ip4_route_metric (device);
747
		}
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		prio = vtable->route_metric_normalize (prio);

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		if (   !best_device
		    || prio < best_prio
			|| (prio == best_prio && preferred_device == device)) {
			best_device = device;
			best_prio = prio;
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		}
	}

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	/* There's only a best activating device if the best device
	 * among all activating and already-activated devices is a
	 * still-activating one.
	 */
	if (best_device && nm_device_get_state (best_device) >= NM_DEVICE_STATE_SECONDARIES)
		return NULL;
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	return best_device;
}

NMDevice *
nm_default_route_manager_ip4_get_best_device (NMDefaultRouteManager *self, const GSList *devices, gboolean fully_activated, NMDevice *preferred_device)
{
770
	if (fully_activated)
771
		return _ipx_get_best_device (&vtable_ip4, self, devices);
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	else
		return _ipx_get_best_activating_device (&vtable_ip4, self, devices, preferred_device);
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}

NMDevice *
nm_default_route_manager_ip6_get_best_device (NMDefaultRouteManager *self, const GSList *devices, gboolean fully_activated, NMDevice *preferred_device)
{
779
	if (fully_activated)
780
		return _ipx_get_best_device (&vtable_ip6, self, devices);
781 782
	else
		return _ipx_get_best_activating_device (&vtable_ip6, self, devices, preferred_device);
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}

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

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static gpointer
_ipx_get_best_config (const VTableIP *vtable,
                      NMDefaultRouteManager *self,
                      gboolean ignore_never_default,
                      const char **out_ip_iface,
                      NMActiveConnection **out_ac,
                      NMDevice **out_device,
                      NMVpnConnection **out_vpn)
{
	NMDefaultRouteManagerPrivate *priv;
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	GPtrArray *entries;
	guint i;
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	gpointer config_result = NULL;

	g_return_val_if_fail (NM_IS_DEFAULT_ROUTE_MANAGER (self), NULL);

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	if (out_ip_iface)
		*out_ip_iface = NULL;
	if (out_ac)
		*out_ac = NULL;
	if (out_device)
		*out_device = NULL;
	if (out_vpn)
		*out_vpn = NULL;

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	priv = NM_DEFAULT_ROUTE_MANAGER_GET_PRIVATE (self);

814
	g_return_val_if_fail (NM_IS_DEFAULT_ROUTE_MANAGER (self), NULL);
815

816 817
	priv = NM_DEFAULT_ROUTE_MANAGER_GET_PRIVATE (self);
	entries = vtable->get_entries (priv);
818

819 820
	for (i = 0; i < entries->len; i++) {
		Entry *entry = g_ptr_array_index (entries, i);
821

822 823
		if (!NM_IS_DEVICE (entry->source.pointer)) {
			NMVpnConnection *vpn = NM_VPN_CONNECTION (entry->source.vpn);
824

825
			if (entry->never_default && !ignore_never_default)
826 827
				continue;

828 829 830 831 832
			if (VTABLE_IS_IP4)
				config_result = nm_vpn_connection_get_ip4_config (vpn);
			else
				config_result = nm_vpn_connection_get_ip6_config (vpn);
			g_assert (config_result);
833

834 835 836 837 838 839
			if (out_vpn)
				*out_vpn = vpn;
			if (out_ac)
				*out_ac = NM_ACTIVE_CONNECTION (vpn);
			if (out_ip_iface)
				*out_ip_iface = nm_vpn_connection_get_ip_iface (vpn);
840
		} else {
841 842
			NMDevice *device = entry->source.device;
			NMActRequest *req;
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			if (VTABLE_IS_IP4)
				config_result = nm_device_get_ip4_config (device);
			else
				config_result = nm_device_get_ip6_config (device);
			g_assert (config_result);
			req = nm_device_get_act_request (device);
			g_assert (req);

			if (out_device)
				*out_device = device;
			if (out_ac)
				*out_ac = NM_ACTIVE_CONNECTION (req);
			if (out_ip_iface)
				*out_ip_iface = nm_device_get_ip_iface (device);
		}
859
		break;
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	}

	return config_result;
}

NMIP4Config *
nm_default_route_manager_ip4_get_best_config (NMDefaultRouteManager *self,
                                              gboolean ignore_never_default,
                                              const char **out_ip_iface,
                                              NMActiveConnection **out_ac,
                                              NMDevice **out_device,
                                              NMVpnConnection **out_vpn)
{
	return _ipx_get_best_config (&vtable_ip4,
	                             self,
	                             ignore_never_default,
	                             out_ip_iface,
	                             out_ac,
	                             out_device,
	                             out_vpn);
}

NMIP6Config *
nm_default_route_manager_ip6_get_best_config (NMDefaultRouteManager *self,
                                              gboolean ignore_never_default,
                                              const char **out_ip_iface,
                                              NMActiveConnection **out_ac,
                                              NMDevice **out_device,
                                              NMVpnConnection **out_vpn)
{
	return _ipx_get_best_config (&vtable_ip6,
	                             self,
	                             ignore_never_default,
	                             out_ip_iface,
	                             out_ac,
	                             out_device,
	                             out_vpn);
}

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

901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998
static GPtrArray *
_v4_get_entries (NMDefaultRouteManagerPrivate *priv)
{
	return priv->entries_ip4;
}

static GPtrArray *
_v6_get_entries (NMDefaultRouteManagerPrivate *priv)
{
	return priv->entries_ip6;
}

static gboolean
_v4_platform_route_delete_default (int ifindex, guint32 metric)
{
	return nm_platform_ip4_route_delete (ifindex, 0, 0, metric);
}

static gboolean
_v6_platform_route_delete_default (int ifindex, guint32 metric)
{
	return nm_platform_ip6_route_delete (ifindex, in6addr_any, 0, metric);
}

static guint32
_v4_route_metric_normalize (guint32 metric)
{
	return metric;
}

static const VTableIP vtable_ip4 = {
	.addr_family                    = AF_INET,
	.get_entries                    = _v4_get_entries,
	.platform_route_to_string       = (const char *(*)(const NMPlatformIPRoute *)) nm_platform_ip4_route_to_string,
	.platform_route_delete_default  = _v4_platform_route_delete_default,
	.route_metric_normalize         = _v4_route_metric_normalize,
};

static const VTableIP vtable_ip6 = {
	.addr_family                    = AF_INET6,
	.get_entries                    = _v6_get_entries,
	.platform_route_to_string       = (const char *(*)(const NMPlatformIPRoute *)) nm_platform_ip6_route_to_string,
	.platform_route_delete_default  = _v6_platform_route_delete_default,
	.route_metric_normalize         = nm_utils_ip6_route_metric_normalize,
};

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

NMDefaultRouteManager *
nm_default_route_manager_get ()
{
	if (G_UNLIKELY (!_instance)) {
		_instance = NM_DEFAULT_ROUTE_MANAGER (g_object_new (NM_TYPE_DEFAULT_ROUTE_MANAGER, NULL));
		g_object_add_weak_pointer (G_OBJECT (_instance), (gpointer *) &_instance);
	}
	return _instance;
}

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

static void
nm_default_route_manager_init (NMDefaultRouteManager *self)
{
	NMDefaultRouteManagerPrivate *priv = NM_DEFAULT_ROUTE_MANAGER_GET_PRIVATE (self);

	priv->entries_ip4 = g_ptr_array_new_full (0, (GDestroyNotify) _entry_free);
	priv->entries_ip6 = g_ptr_array_new_full (0, (GDestroyNotify) _entry_free);
}

static void
dispose (GObject *object)
{
	NMDefaultRouteManager *self = NM_DEFAULT_ROUTE_MANAGER (object);
	NMDefaultRouteManagerPrivate *priv = NM_DEFAULT_ROUTE_MANAGER_GET_PRIVATE (self);

	if (priv->entries_ip4) {
		g_ptr_array_free (priv->entries_ip4, TRUE);
		priv->entries_ip4 = NULL;
	}
	if (priv->entries_ip6) {
		g_ptr_array_free (priv->entries_ip6, TRUE);
		priv->entries_ip6 = NULL;
	}

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

static void
nm_default_route_manager_class_init (NMDefaultRouteManagerClass *klass)
{
	GObjectClass *object_class = G_OBJECT_CLASS (klass);

	g_type_class_add_private (klass, sizeof (NMDefaultRouteManagerPrivate));

	/* virtual methods */
	object_class->dispose = dispose;
}