nm-default-route-manager.c 31.3 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
/* -*- 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"

24 25
#include "nm-default-route-manager.h"

26 27 28 29
#include "string.h"

#include "nm-logging.h"
#include "nm-device.h"
30
#include "nm-vpn-connection.h"
31
#include "nm-platform.h"
32
#include "nm-manager.h"
33 34
#include "nm-ip4-config.h"
#include "nm-ip6-config.h"
35
#include "nm-activation-request.h"
36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76

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, \
77
		NM_IS_DEVICE (entry->source.pointer) ? nm_device_get_iface (entry->source.device) : nm_vpn_connection_get_connection_id (entry->source.vpn)
78 79 80 81 82 83 84 85

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

typedef struct {
	union {
		void *pointer;
		GObject *object;
		NMDevice *device;
86
		NMVpnConnection *vpn;
87
	} source;
88
	NMPlatformIPXRoute route;
89
	gboolean synced; /* if true, we synced the entry to platform. We don't sync assumed devices */
90 91 92 93 94 95

	/* 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;

96 97 98 99 100 101 102
	guint32 effective_metric;
} Entry;

typedef struct {
	int addr_family;
	GPtrArray *(*get_entries) (NMDefaultRouteManagerPrivate *priv);
	const char *(*platform_route_to_string) (const NMPlatformIPRoute *route);
103
	GArray *(*platform_route_get_all) (int ifindex, NMPlatformGetRouteMode mode);
104 105 106 107 108 109 110 111
	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)

112 113 114 115 116 117 118 119 120
static NMPlatformIPRoute *
_vt_route_index (const VTableIP *vtable, GArray *routes, guint index)
{
	if (VTABLE_IS_IP4)
		return (NMPlatformIPRoute *) &g_array_index (routes, NMPlatformIP4Route, index);
	else
		return (NMPlatformIPRoute *) &g_array_index (routes, NMPlatformIP6Route, index);
}

121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165
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);

166 167 168
		if (e->never_default)
			continue;

169 170 171 172 173
		if (e->effective_metric != metric)
			continue;

		if (e->synced) {
			g_assert (!entry || metric == G_MAXUINT32);
174 175
			if (!entry)
				entry = e;
176 177 178 179 180 181 182 183 184 185 186 187
		} 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) {
188 189
		success = nm_platform_ip4_route_add (entry->route.rx.ifindex,
		                                     entry->route.rx.source,
190 191
		                                     0,
		                                     0,
192
		                                     entry->route.r4.gateway,
193
		                                     entry->effective_metric,
194
		                                     entry->route.rx.mss);
195
	} else {
196 197
		success = nm_platform_ip6_route_add (entry->route.rx.ifindex,
		                                     entry->route.rx.source,
198 199
		                                     in6addr_any,
		                                     0,
200
		                                     entry->route.r6.gateway,
201
		                                     entry->effective_metric,
202 203 204 205 206
		                                     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);
207 208 209 210 211 212 213 214 215
	}
}

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;
216
	guint i, j;
217 218

	/* prune all other default routes from this device. */
219
	routes = vtable->platform_route_get_all (0, NM_PLATFORM_GET_ROUTE_MODE_ONLY_DEFAULT);
220 221 222 223 224 225

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

226
		route = _vt_route_index (vtable, routes, i);
227 228 229

		/* look at all entires and see if the route for this ifindex pair is
		 * a known entry. */
230 231
		for (j = 0; j < entries->len; j++) {
			Entry *e = g_ptr_array_index (entries, j);
232

233 234 235
			if (e->never_default)
				continue;

236
			if (   e->route.rx.ifindex == route->ifindex
237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264
			    && 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. */
265 266
	m_a = e_a->route.rx.metric;
	m_b = e_b->route.rx.metric;
267 268 269 270 271 272 273

	/* 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;

274 275 276 277
	/* 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;

278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299
	/* 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
300
_resync_all (const VTableIP *vtable, NMDefaultRouteManager *self, const Entry *changed_entry, const Entry *old_entry)
301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324
{
	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);

325 326 327
		if (entry->never_default)
			continue;

328 329 330 331 332
		if (!entry->synced) {
			last_metric = MAX (last_metric, (gint64) entry->effective_metric);
			continue;
		}

333
		expected_metric = entry->route.rx.metric;
334 335 336 337 338 339 340
		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));
341 342 343 344 345 346 347 348
			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);
			}
349 350 351
		} 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));
352 353 354
			_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);
355 356 357 358 359 360
		}

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

361 362 363 364
	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);
365 366 367 368 369

	g_hash_table_unref (changed_metrics);
}

static void
370
_entry_at_idx_update (const VTableIP *vtable, NMDefaultRouteManager *self, guint entry_idx, const Entry *old_entry)
371 372 373 374 375 376 377 378 379 380 381
{
	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
382
	          || (entry->source.pointer == old_entry->source.pointer && entry->route.rx.ifindex == old_entry->route.rx.ifindex));
383 384

	if (!entry->synced) {
385
		entry->effective_metric = entry->route.rx.metric;
386 387 388
		_LOGD (vtable->addr_family, LOG_ENTRY_FMT": %s %s%s",
		       LOG_ENTRY_ARGS (entry_idx, entry),
		       old_entry ? "update" : "add",
389
		       vtable->platform_route_to_string (&entry->route.rx),
390
		       entry->never_default ? " (never-default)" : (entry->synced ? "" : " (not synced)"));
391 392 393 394
	}

	g_ptr_array_sort_with_data (entries, _sort_entries_cmp, NULL);

395
	_resync_all (vtable, self, entry, old_entry);
396 397 398
}

static void
399
_entry_at_idx_remove (const VTableIP *vtable, NMDefaultRouteManager *self, guint entry_idx)
400 401 402 403 404 405 406 407 408 409 410
{
	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);

411 412 413
	_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");
414 415 416 417 418

	/* 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);

419
	_resync_all (vtable, self, NULL, entry);
420 421 422 423 424 425 426 427 428 429 430 431 432

	_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;
433
	NMPlatformIPXRoute rt;
434 435 436
	int ip_ifindex;
	GPtrArray *entries;
	NMDevice *device = NULL;
437 438
	NMVpnConnection *vpn = NULL;
	gboolean never_default = FALSE;
439 440 441 442 443
	gboolean synced;

	g_return_if_fail (NM_IS_DEFAULT_ROUTE_MANAGER (self));
	if (NM_IS_DEVICE (source))
		device = source;
444 445
	else if (NM_IS_VPN_CONNECTION (source))
		vpn = source;
446 447 448
	else
		g_return_if_reached ();

449 450 451 452 453 454 455 456 457 458 459 460
	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);
		}
	}
461 462 463 464 465 466 467

	priv = NM_DEFAULT_ROUTE_MANAGER_GET_PRIVATE (self);

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

	if (   entry
468
	    && entry->route.rx.ifindex != ip_ifindex) {
469 470 471
		/* 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),
472
		       entry->route.rx.ifindex, ip_ifindex);
473 474

		g_object_freeze_notify (G_OBJECT (self));
475
		_entry_at_idx_remove (vtable, self, entry_idx);
476 477 478 479 480 481 482 483
		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) {
484 485 486 487 488 489 490 491 492 493 494
		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) {

495
				memset (&rt, 0, sizeof (rt));
496 497 498 499 500 501
				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);
502 503 504 505 506 507
						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;
508 509 510 511 512 513 514 515 516
					}
				} 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);
517 518 519 520 521 522
						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;
523 524 525 526
					}
				}
			}
		}
527 528 529
	}
	g_assert (!default_route || default_route->plen == 0);

530 531 532
	/* 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));
533 534 535 536 537 538 539 540 541

	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)
542
			entry->route.r4 = *((const NMPlatformIP4Route *) default_route);
543
		else
544
			entry->route.r6 = *((const NMPlatformIP6Route *) default_route);
545 546

		/* only use normalized metrics */
547 548
		entry->route.rx.metric = vtable->route_metric_normalize (entry->route.rx.metric);
		entry->route.rx.ifindex = ip_ifindex;
549
		entry->never_default = never_default;
550
		entry->effective_metric = entry->route.rx.metric;
551 552 553
		entry->synced = synced;

		g_ptr_array_add (entries, entry);
554
		_entry_at_idx_update (vtable, self, entries->len - 1, NULL);
555 556 557 558 559 560
	} else if (default_route) {
		/* update */
		Entry old_entry, new_entry;

		new_entry = *entry;
		if (VTABLE_IS_IP4)
561
			new_entry.route.r4 = *((const NMPlatformIP4Route *) default_route);
562
		else
563
			new_entry.route.r6 = *((const NMPlatformIP6Route *) default_route);
564
		/* only use normalized metrics */
565 566
		new_entry.route.rx.metric = vtable->route_metric_normalize (new_entry.route.rx.metric);
		new_entry.route.rx.ifindex = ip_ifindex;
567
		new_entry.never_default = never_default;
568 569 570 571 572 573 574
		new_entry.synced = synced;

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

		old_entry = *entry;
		*entry = new_entry;
575
		_entry_at_idx_update (vtable, self, entry_idx, &old_entry);
576 577
	} else {
		/* delete */
578
		_entry_at_idx_remove (vtable, self, entry_idx);
579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642
	}
}

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 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);
}

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

643
static NMDevice *
644
_ipx_get_best_device (const VTableIP *vtable, NMDefaultRouteManager *self, const GSList *devices)
645 646 647 648 649 650 651
{
	NMDefaultRouteManagerPrivate *priv;
	GPtrArray *entries;
	guint i;

	g_return_val_if_fail (NM_IS_DEFAULT_ROUTE_MANAGER (self), NULL);

652 653 654
	if (!devices)
		return NULL;

655 656 657 658 659 660 661 662 663 664
	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);
665 666 667

		if (g_slist_find ((GSList *) devices, entry->source.device))
			return entry->source.pointer;
668 669 670 671 672
	}
	return NULL;
}

/** _ipx_get_best_activating_device:
673 674 675 676 677 678 679 680 681 682
 * @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 *
683
_ipx_get_best_activating_device (const VTableIP *vtable, NMDefaultRouteManager *self, const GSList *devices, NMDevice *preferred_device)
684
{
685
	NMDefaultRouteManagerPrivate *priv;
686 687 688
	const GSList *iter;
	NMDevice *best_device = NULL;
	guint32 best_prio = G_MAXUINT32;
689
	NMDevice *best_activated_device;
690 691 692

	g_return_val_if_fail (NM_IS_DEFAULT_ROUTE_MANAGER (self), NULL);

693 694
	priv = NM_DEFAULT_ROUTE_MANAGER_GET_PRIVATE (self);

695
	best_activated_device = _ipx_get_best_device (vtable, self, devices);
696

697 698 699
	for (iter = devices; iter; iter = g_slist_next (iter)) {
		NMDevice *device = NM_DEVICE (iter->data);
		guint32 prio;
700
		Entry *entry;
701

702
		entry = _entry_find_by_source (vtable->get_entries (priv), device, NULL);
703

704 705 706 707 708 709 710 711
		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);
712

713 714 715
			if (   state <= NM_DEVICE_STATE_DISCONNECTED
			    || state >= NM_DEVICE_STATE_DEACTIVATING)
				continue;
716

717 718
			if (!_ipx_connection_has_default_route (vtable, self, nm_device_get_connection (device)))
				continue;
719

720
			prio = nm_device_get_ip4_route_metric (device);
721
		}
722 723
		prio = vtable->route_metric_normalize (prio);

724 725 726 727 728
		if (   !best_device
		    || prio < best_prio
			|| (prio == best_prio && preferred_device == device)) {
			best_device = device;
			best_prio = prio;
729 730 731
		}
	}

732 733 734 735 736 737
	/* 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;
738 739 740 741 742 743
	return best_device;
}

NMDevice *
nm_default_route_manager_ip4_get_best_device (NMDefaultRouteManager *self, const GSList *devices, gboolean fully_activated, NMDevice *preferred_device)
{
744
	if (fully_activated)
745
		return _ipx_get_best_device (&vtable_ip4, self, devices);
746 747
	else
		return _ipx_get_best_activating_device (&vtable_ip4, self, devices, preferred_device);
748 749 750 751 752
}

NMDevice *
nm_default_route_manager_ip6_get_best_device (NMDefaultRouteManager *self, const GSList *devices, gboolean fully_activated, NMDevice *preferred_device)
{
753
	if (fully_activated)
754
		return _ipx_get_best_device (&vtable_ip6, self, devices);
755 756
	else
		return _ipx_get_best_activating_device (&vtable_ip6, self, devices, preferred_device);
757 758 759 760
}

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

761 762 763 764 765 766 767 768 769 770
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;
771 772
	GPtrArray *entries;
	guint i;
773 774 775 776
	gpointer config_result = NULL;

	g_return_val_if_fail (NM_IS_DEFAULT_ROUTE_MANAGER (self), NULL);

777 778 779 780 781 782 783 784 785
	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;

786 787
	priv = NM_DEFAULT_ROUTE_MANAGER_GET_PRIVATE (self);

788
	g_return_val_if_fail (NM_IS_DEFAULT_ROUTE_MANAGER (self), NULL);
789

790 791
	priv = NM_DEFAULT_ROUTE_MANAGER_GET_PRIVATE (self);
	entries = vtable->get_entries (priv);
792

793 794
	for (i = 0; i < entries->len; i++) {
		Entry *entry = g_ptr_array_index (entries, i);
795

796 797
		if (!NM_IS_DEVICE (entry->source.pointer)) {
			NMVpnConnection *vpn = NM_VPN_CONNECTION (entry->source.vpn);
798

799
			if (entry->never_default && !ignore_never_default)
800 801
				continue;

802 803 804 805 806
			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);
807

808 809 810 811 812 813
			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);
814
		} else {
815 816
			NMDevice *device = entry->source.device;
			NMActRequest *req;
817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832

			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);
		}
833
		break;
834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874
	}

	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);
}

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

875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908
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,
909
	.platform_route_get_all         = nm_platform_ip4_route_get_all,
910 911 912 913 914 915 916 917
	.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,
918
	.platform_route_get_all         = nm_platform_ip6_route_get_all,
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
	.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;
}