1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * INET		An implementation of the TCP/IP protocol suite for the LINUX
   4 *		operating system.  INET is implemented using the  BSD Socket
   5 *		interface as the means of communication with the user level.
   6 *
   7 *		Routing netlink socket interface: protocol independent part.
   8 *
   9 * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10 *
  11 *	Fixes:
  12 *	Vitaly E. Lavrov		RTA_OK arithmetic was wrong.
  13 */
  14
  15#include <linux/bitops.h>
  16#include <linux/errno.h>
  17#include <linux/module.h>
  18#include <linux/types.h>
  19#include <linux/socket.h>
  20#include <linux/kernel.h>
  21#include <linux/timer.h>
  22#include <linux/string.h>
  23#include <linux/sockios.h>
  24#include <linux/net.h>
  25#include <linux/fcntl.h>
  26#include <linux/mm.h>
  27#include <linux/slab.h>
  28#include <linux/interrupt.h>
  29#include <linux/capability.h>
  30#include <linux/skbuff.h>
  31#include <linux/init.h>
  32#include <linux/security.h>
  33#include <linux/mutex.h>
  34#include <linux/if_addr.h>
  35#include <linux/if_bridge.h>
  36#include <linux/if_vlan.h>
  37#include <linux/pci.h>
  38#include <linux/etherdevice.h>
  39#include <linux/bpf.h>
  40
  41#include <linux/uaccess.h>
  42
  43#include <linux/inet.h>
  44#include <linux/netdevice.h>
  45#include <net/ip.h>
  46#include <net/protocol.h>
  47#include <net/arp.h>
  48#include <net/route.h>
  49#include <net/udp.h>
  50#include <net/tcp.h>
  51#include <net/sock.h>
  52#include <net/pkt_sched.h>
  53#include <net/fib_rules.h>
  54#include <net/rtnetlink.h>
  55#include <net/net_namespace.h>
 
 
 
 
 
 
 
  56
  57#define RTNL_MAX_TYPE		50
  58#define RTNL_SLAVE_MAX_TYPE	40
  59
  60struct rtnl_link {
  61	rtnl_doit_func		doit;
  62	rtnl_dumpit_func	dumpit;
  63	struct module		*owner;
  64	unsigned int		flags;
  65	struct rcu_head		rcu;
  66};
  67
  68static DEFINE_MUTEX(rtnl_mutex);
  69
  70void rtnl_lock(void)
  71{
  72	mutex_lock(&rtnl_mutex);
  73}
  74EXPORT_SYMBOL(rtnl_lock);
  75
  76int rtnl_lock_killable(void)
  77{
  78	return mutex_lock_killable(&rtnl_mutex);
  79}
  80EXPORT_SYMBOL(rtnl_lock_killable);
  81
  82static struct sk_buff *defer_kfree_skb_list;
  83void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail)
  84{
  85	if (head && tail) {
  86		tail->next = defer_kfree_skb_list;
  87		defer_kfree_skb_list = head;
  88	}
  89}
  90EXPORT_SYMBOL(rtnl_kfree_skbs);
  91
  92void __rtnl_unlock(void)
  93{
  94	struct sk_buff *head = defer_kfree_skb_list;
  95
  96	defer_kfree_skb_list = NULL;
  97
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  98	mutex_unlock(&rtnl_mutex);
  99
 100	while (head) {
 101		struct sk_buff *next = head->next;
 102
 103		kfree_skb(head);
 104		cond_resched();
 105		head = next;
 106	}
 107}
 108
 109void rtnl_unlock(void)
 110{
 111	/* This fellow will unlock it for us. */
 112	netdev_run_todo();
 113}
 114EXPORT_SYMBOL(rtnl_unlock);
 115
 116int rtnl_trylock(void)
 117{
 118	return mutex_trylock(&rtnl_mutex);
 119}
 120EXPORT_SYMBOL(rtnl_trylock);
 121
 122int rtnl_is_locked(void)
 123{
 124	return mutex_is_locked(&rtnl_mutex);
 125}
 126EXPORT_SYMBOL(rtnl_is_locked);
 127
 128bool refcount_dec_and_rtnl_lock(refcount_t *r)
 129{
 130	return refcount_dec_and_mutex_lock(r, &rtnl_mutex);
 131}
 132EXPORT_SYMBOL(refcount_dec_and_rtnl_lock);
 133
 134#ifdef CONFIG_PROVE_LOCKING
 135bool lockdep_rtnl_is_held(void)
 136{
 137	return lockdep_is_held(&rtnl_mutex);
 138}
 139EXPORT_SYMBOL(lockdep_rtnl_is_held);
 140#endif /* #ifdef CONFIG_PROVE_LOCKING */
 141
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 142static struct rtnl_link __rcu *__rcu *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
 143
 144static inline int rtm_msgindex(int msgtype)
 145{
 146	int msgindex = msgtype - RTM_BASE;
 147
 148	/*
 149	 * msgindex < 0 implies someone tried to register a netlink
 150	 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
 151	 * the message type has not been added to linux/rtnetlink.h
 152	 */
 153	BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
 154
 155	return msgindex;
 156}
 157
 158static struct rtnl_link *rtnl_get_link(int protocol, int msgtype)
 159{
 160	struct rtnl_link __rcu **tab;
 161
 162	if (protocol >= ARRAY_SIZE(rtnl_msg_handlers))
 163		protocol = PF_UNSPEC;
 164
 165	tab = rcu_dereference_rtnl(rtnl_msg_handlers[protocol]);
 166	if (!tab)
 167		tab = rcu_dereference_rtnl(rtnl_msg_handlers[PF_UNSPEC]);
 168
 169	return rcu_dereference_rtnl(tab[msgtype]);
 170}
 171
 172static int rtnl_register_internal(struct module *owner,
 173				  int protocol, int msgtype,
 174				  rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 175				  unsigned int flags)
 176{
 177	struct rtnl_link *link, *old;
 178	struct rtnl_link __rcu **tab;
 179	int msgindex;
 180	int ret = -ENOBUFS;
 181
 182	BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 183	msgindex = rtm_msgindex(msgtype);
 184
 185	rtnl_lock();
 186	tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
 187	if (tab == NULL) {
 188		tab = kcalloc(RTM_NR_MSGTYPES, sizeof(void *), GFP_KERNEL);
 189		if (!tab)
 190			goto unlock;
 191
 192		/* ensures we see the 0 stores */
 193		rcu_assign_pointer(rtnl_msg_handlers[protocol], tab);
 194	}
 195
 196	old = rtnl_dereference(tab[msgindex]);
 197	if (old) {
 198		link = kmemdup(old, sizeof(*old), GFP_KERNEL);
 199		if (!link)
 200			goto unlock;
 201	} else {
 202		link = kzalloc(sizeof(*link), GFP_KERNEL);
 203		if (!link)
 204			goto unlock;
 205	}
 206
 207	WARN_ON(link->owner && link->owner != owner);
 208	link->owner = owner;
 209
 210	WARN_ON(doit && link->doit && link->doit != doit);
 211	if (doit)
 212		link->doit = doit;
 213	WARN_ON(dumpit && link->dumpit && link->dumpit != dumpit);
 214	if (dumpit)
 215		link->dumpit = dumpit;
 216
 
 
 217	link->flags |= flags;
 218
 219	/* publish protocol:msgtype */
 220	rcu_assign_pointer(tab[msgindex], link);
 221	ret = 0;
 222	if (old)
 223		kfree_rcu(old, rcu);
 224unlock:
 225	rtnl_unlock();
 226	return ret;
 227}
 228
 229/**
 230 * rtnl_register_module - Register a rtnetlink message type
 231 *
 232 * @owner: module registering the hook (THIS_MODULE)
 233 * @protocol: Protocol family or PF_UNSPEC
 234 * @msgtype: rtnetlink message type
 235 * @doit: Function pointer called for each request message
 236 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 237 * @flags: rtnl_link_flags to modify behaviour of doit/dumpit functions
 238 *
 239 * Like rtnl_register, but for use by removable modules.
 240 */
 241int rtnl_register_module(struct module *owner,
 242			 int protocol, int msgtype,
 243			 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 244			 unsigned int flags)
 245{
 246	return rtnl_register_internal(owner, protocol, msgtype,
 247				      doit, dumpit, flags);
 248}
 249EXPORT_SYMBOL_GPL(rtnl_register_module);
 250
 251/**
 252 * rtnl_register - Register a rtnetlink message type
 253 * @protocol: Protocol family or PF_UNSPEC
 254 * @msgtype: rtnetlink message type
 255 * @doit: Function pointer called for each request message
 256 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
 257 * @flags: rtnl_link_flags to modify behaviour of doit/dumpit functions
 258 *
 259 * Registers the specified function pointers (at least one of them has
 260 * to be non-NULL) to be called whenever a request message for the
 261 * specified protocol family and message type is received.
 262 *
 263 * The special protocol family PF_UNSPEC may be used to define fallback
 264 * function pointers for the case when no entry for the specific protocol
 265 * family exists.
 266 */
 267void rtnl_register(int protocol, int msgtype,
 268		   rtnl_doit_func doit, rtnl_dumpit_func dumpit,
 269		   unsigned int flags)
 270{
 271	int err;
 272
 273	err = rtnl_register_internal(NULL, protocol, msgtype, doit, dumpit,
 274				     flags);
 275	if (err)
 276		pr_err("Unable to register rtnetlink message handler, "
 277		       "protocol = %d, message type = %d\n", protocol, msgtype);
 278}
 279
 280/**
 281 * rtnl_unregister - Unregister a rtnetlink message type
 282 * @protocol: Protocol family or PF_UNSPEC
 283 * @msgtype: rtnetlink message type
 284 *
 285 * Returns 0 on success or a negative error code.
 286 */
 287int rtnl_unregister(int protocol, int msgtype)
 288{
 289	struct rtnl_link __rcu **tab;
 290	struct rtnl_link *link;
 291	int msgindex;
 292
 293	BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 294	msgindex = rtm_msgindex(msgtype);
 295
 296	rtnl_lock();
 297	tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
 298	if (!tab) {
 299		rtnl_unlock();
 300		return -ENOENT;
 301	}
 302
 303	link = rtnl_dereference(tab[msgindex]);
 304	rcu_assign_pointer(tab[msgindex], NULL);
 305	rtnl_unlock();
 306
 307	kfree_rcu(link, rcu);
 308
 309	return 0;
 310}
 311EXPORT_SYMBOL_GPL(rtnl_unregister);
 312
 313/**
 314 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
 315 * @protocol : Protocol family or PF_UNSPEC
 316 *
 317 * Identical to calling rtnl_unregster() for all registered message types
 318 * of a certain protocol family.
 319 */
 320void rtnl_unregister_all(int protocol)
 321{
 322	struct rtnl_link __rcu **tab;
 323	struct rtnl_link *link;
 324	int msgindex;
 325
 326	BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
 327
 328	rtnl_lock();
 329	tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
 330	if (!tab) {
 331		rtnl_unlock();
 332		return;
 333	}
 334	RCU_INIT_POINTER(rtnl_msg_handlers[protocol], NULL);
 335	for (msgindex = 0; msgindex < RTM_NR_MSGTYPES; msgindex++) {
 336		link = rtnl_dereference(tab[msgindex]);
 337		if (!link)
 338			continue;
 339
 340		rcu_assign_pointer(tab[msgindex], NULL);
 341		kfree_rcu(link, rcu);
 342	}
 343	rtnl_unlock();
 344
 345	synchronize_net();
 346
 347	kfree(tab);
 348}
 349EXPORT_SYMBOL_GPL(rtnl_unregister_all);
 350
 351static LIST_HEAD(link_ops);
 352
 353static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 354{
 355	const struct rtnl_link_ops *ops;
 
 
 
 
 
 
 
 
 
 
 356
 357	list_for_each_entry(ops, &link_ops, list) {
 358		if (!strcmp(ops->kind, kind))
 359			return ops;
 360	}
 361	return NULL;
 
 362}
 
 363
 364/**
 365 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 366 * @ops: struct rtnl_link_ops * to register
 367 *
 368 * The caller must hold the rtnl_mutex. This function should be used
 369 * by drivers that create devices during module initialization. It
 370 * must be called before registering the devices.
 371 *
 372 * Returns 0 on success or a negative error code.
 373 */
 374int __rtnl_link_register(struct rtnl_link_ops *ops)
 375{
 376	if (rtnl_link_ops_get(ops->kind))
 377		return -EEXIST;
 378
 379	/* The check for alloc/setup is here because if ops
 380	 * does not have that filled up, it is not possible
 381	 * to use the ops for creating device. So do not
 382	 * fill up dellink as well. That disables rtnl_dellink.
 383	 */
 384	if ((ops->alloc || ops->setup) && !ops->dellink)
 385		ops->dellink = unregister_netdevice_queue;
 386
 387	list_add_tail(&ops->list, &link_ops);
 388	return 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 389}
 390EXPORT_SYMBOL_GPL(__rtnl_link_register);
 391
 392/**
 393 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
 394 * @ops: struct rtnl_link_ops * to register
 395 *
 396 * Returns 0 on success or a negative error code.
 397 */
 398int rtnl_link_register(struct rtnl_link_ops *ops)
 399{
 
 400	int err;
 401
 402	/* Sanity-check max sizes to avoid stack buffer overflow. */
 403	if (WARN_ON(ops->maxtype > RTNL_MAX_TYPE ||
 404		    ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE))
 405		return -EINVAL;
 406
 407	rtnl_lock();
 408	err = __rtnl_link_register(ops);
 409	rtnl_unlock();
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 410	return err;
 411}
 412EXPORT_SYMBOL_GPL(rtnl_link_register);
 413
 414static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
 415{
 416	struct net_device *dev;
 417	LIST_HEAD(list_kill);
 418
 419	for_each_netdev(net, dev) {
 420		if (dev->rtnl_link_ops == ops)
 421			ops->dellink(dev, &list_kill);
 422	}
 423	unregister_netdevice_many(&list_kill);
 424}
 425
 426/**
 427 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 428 * @ops: struct rtnl_link_ops * to unregister
 429 *
 430 * The caller must hold the rtnl_mutex and guarantee net_namespace_list
 431 * integrity (hold pernet_ops_rwsem for writing to close the race
 432 * with setup_net() and cleanup_net()).
 433 */
 434void __rtnl_link_unregister(struct rtnl_link_ops *ops)
 435{
 436	struct net *net;
 437
 438	for_each_net(net) {
 439		__rtnl_kill_links(net, ops);
 440	}
 441	list_del(&ops->list);
 442}
 443EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
 444
 445/* Return with the rtnl_lock held when there are no network
 446 * devices unregistering in any network namespace.
 447 */
 448static void rtnl_lock_unregistering_all(void)
 449{
 450	struct net *net;
 451	bool unregistering;
 452	DEFINE_WAIT_FUNC(wait, woken_wake_function);
 453
 454	add_wait_queue(&netdev_unregistering_wq, &wait);
 455	for (;;) {
 456		unregistering = false;
 457		rtnl_lock();
 458		/* We held write locked pernet_ops_rwsem, and parallel
 459		 * setup_net() and cleanup_net() are not possible.
 460		 */
 461		for_each_net(net) {
 462			if (net->dev_unreg_count > 0) {
 463				unregistering = true;
 464				break;
 465			}
 466		}
 467		if (!unregistering)
 468			break;
 469		__rtnl_unlock();
 470
 471		wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
 472	}
 473	remove_wait_queue(&netdev_unregistering_wq, &wait);
 474}
 475
 476/**
 477 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
 478 * @ops: struct rtnl_link_ops * to unregister
 479 */
 480void rtnl_link_unregister(struct rtnl_link_ops *ops)
 481{
 
 
 
 
 
 
 
 
 
 482	/* Close the race with setup_net() and cleanup_net() */
 483	down_write(&pernet_ops_rwsem);
 484	rtnl_lock_unregistering_all();
 485	__rtnl_link_unregister(ops);
 
 
 
 486	rtnl_unlock();
 487	up_write(&pernet_ops_rwsem);
 488}
 489EXPORT_SYMBOL_GPL(rtnl_link_unregister);
 490
 491static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
 492{
 493	struct net_device *master_dev;
 494	const struct rtnl_link_ops *ops;
 495	size_t size = 0;
 496
 497	rcu_read_lock();
 498
 499	master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
 500	if (!master_dev)
 501		goto out;
 502
 503	ops = master_dev->rtnl_link_ops;
 504	if (!ops || !ops->get_slave_size)
 505		goto out;
 506	/* IFLA_INFO_SLAVE_DATA + nested data */
 507	size = nla_total_size(sizeof(struct nlattr)) +
 508	       ops->get_slave_size(master_dev, dev);
 509
 510out:
 511	rcu_read_unlock();
 512	return size;
 513}
 514
 515static size_t rtnl_link_get_size(const struct net_device *dev)
 516{
 517	const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 518	size_t size;
 519
 520	if (!ops)
 521		return 0;
 522
 523	size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
 524	       nla_total_size(strlen(ops->kind) + 1);  /* IFLA_INFO_KIND */
 525
 526	if (ops->get_size)
 527		/* IFLA_INFO_DATA + nested data */
 528		size += nla_total_size(sizeof(struct nlattr)) +
 529			ops->get_size(dev);
 530
 531	if (ops->get_xstats_size)
 532		/* IFLA_INFO_XSTATS */
 533		size += nla_total_size(ops->get_xstats_size(dev));
 534
 535	size += rtnl_link_get_slave_info_data_size(dev);
 536
 537	return size;
 538}
 539
 540static LIST_HEAD(rtnl_af_ops);
 541
 542static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
 543{
 544	const struct rtnl_af_ops *ops;
 545
 546	ASSERT_RTNL();
 547
 548	list_for_each_entry(ops, &rtnl_af_ops, list) {
 549		if (ops->family == family)
 550			return ops;
 
 
 
 
 551	}
 552
 553	return NULL;
 
 
 
 
 
 
 
 
 
 554}
 555
 556/**
 557 * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
 558 * @ops: struct rtnl_af_ops * to register
 559 *
 560 * Returns 0 on success or a negative error code.
 561 */
 562void rtnl_af_register(struct rtnl_af_ops *ops)
 563{
 
 
 
 
 
 564	rtnl_lock();
 565	list_add_tail_rcu(&ops->list, &rtnl_af_ops);
 566	rtnl_unlock();
 
 
 567}
 568EXPORT_SYMBOL_GPL(rtnl_af_register);
 569
 570/**
 571 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
 572 * @ops: struct rtnl_af_ops * to unregister
 573 */
 574void rtnl_af_unregister(struct rtnl_af_ops *ops)
 575{
 576	rtnl_lock();
 577	list_del_rcu(&ops->list);
 578	rtnl_unlock();
 579
 580	synchronize_rcu();
 
 
 581}
 582EXPORT_SYMBOL_GPL(rtnl_af_unregister);
 583
 584static size_t rtnl_link_get_af_size(const struct net_device *dev,
 585				    u32 ext_filter_mask)
 586{
 587	struct rtnl_af_ops *af_ops;
 588	size_t size;
 589
 590	/* IFLA_AF_SPEC */
 591	size = nla_total_size(sizeof(struct nlattr));
 592
 593	rcu_read_lock();
 594	list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
 595		if (af_ops->get_link_af_size) {
 596			/* AF_* + nested data */
 597			size += nla_total_size(sizeof(struct nlattr)) +
 598				af_ops->get_link_af_size(dev, ext_filter_mask);
 599		}
 600	}
 601	rcu_read_unlock();
 602
 603	return size;
 604}
 605
 606static bool rtnl_have_link_slave_info(const struct net_device *dev)
 607{
 608	struct net_device *master_dev;
 609	bool ret = false;
 610
 611	rcu_read_lock();
 612
 613	master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
 614	if (master_dev && master_dev->rtnl_link_ops)
 615		ret = true;
 616	rcu_read_unlock();
 617	return ret;
 618}
 619
 620static int rtnl_link_slave_info_fill(struct sk_buff *skb,
 621				     const struct net_device *dev)
 622{
 623	struct net_device *master_dev;
 624	const struct rtnl_link_ops *ops;
 625	struct nlattr *slave_data;
 626	int err;
 627
 628	master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
 629	if (!master_dev)
 630		return 0;
 631	ops = master_dev->rtnl_link_ops;
 632	if (!ops)
 633		return 0;
 634	if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
 635		return -EMSGSIZE;
 636	if (ops->fill_slave_info) {
 637		slave_data = nla_nest_start_noflag(skb, IFLA_INFO_SLAVE_DATA);
 638		if (!slave_data)
 639			return -EMSGSIZE;
 640		err = ops->fill_slave_info(skb, master_dev, dev);
 641		if (err < 0)
 642			goto err_cancel_slave_data;
 643		nla_nest_end(skb, slave_data);
 644	}
 645	return 0;
 646
 647err_cancel_slave_data:
 648	nla_nest_cancel(skb, slave_data);
 649	return err;
 650}
 651
 652static int rtnl_link_info_fill(struct sk_buff *skb,
 653			       const struct net_device *dev)
 654{
 655	const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
 656	struct nlattr *data;
 657	int err;
 658
 659	if (!ops)
 660		return 0;
 661	if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
 662		return -EMSGSIZE;
 663	if (ops->fill_xstats) {
 664		err = ops->fill_xstats(skb, dev);
 665		if (err < 0)
 666			return err;
 667	}
 668	if (ops->fill_info) {
 669		data = nla_nest_start_noflag(skb, IFLA_INFO_DATA);
 670		if (data == NULL)
 671			return -EMSGSIZE;
 672		err = ops->fill_info(skb, dev);
 673		if (err < 0)
 674			goto err_cancel_data;
 675		nla_nest_end(skb, data);
 676	}
 677	return 0;
 678
 679err_cancel_data:
 680	nla_nest_cancel(skb, data);
 681	return err;
 682}
 683
 684static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
 685{
 686	struct nlattr *linkinfo;
 687	int err = -EMSGSIZE;
 688
 689	linkinfo = nla_nest_start_noflag(skb, IFLA_LINKINFO);
 690	if (linkinfo == NULL)
 691		goto out;
 692
 693	err = rtnl_link_info_fill(skb, dev);
 694	if (err < 0)
 695		goto err_cancel_link;
 696
 697	err = rtnl_link_slave_info_fill(skb, dev);
 698	if (err < 0)
 699		goto err_cancel_link;
 700
 701	nla_nest_end(skb, linkinfo);
 702	return 0;
 703
 704err_cancel_link:
 705	nla_nest_cancel(skb, linkinfo);
 706out:
 707	return err;
 708}
 709
 710int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
 711{
 712	struct sock *rtnl = net->rtnl;
 713	int err = 0;
 714
 715	NETLINK_CB(skb).dst_group = group;
 716	if (echo)
 717		refcount_inc(&skb->users);
 718	netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
 719	if (echo)
 720		err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
 721	return err;
 722}
 723
 724int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
 725{
 726	struct sock *rtnl = net->rtnl;
 727
 728	return nlmsg_unicast(rtnl, skb, pid);
 729}
 730EXPORT_SYMBOL(rtnl_unicast);
 731
 732void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
 733		 struct nlmsghdr *nlh, gfp_t flags)
 734{
 735	struct sock *rtnl = net->rtnl;
 736	int report = 0;
 737
 738	if (nlh)
 739		report = nlmsg_report(nlh);
 740
 741	nlmsg_notify(rtnl, skb, pid, group, report, flags);
 742}
 743EXPORT_SYMBOL(rtnl_notify);
 744
 745void rtnl_set_sk_err(struct net *net, u32 group, int error)
 746{
 747	struct sock *rtnl = net->rtnl;
 748
 749	netlink_set_err(rtnl, 0, group, error);
 750}
 751EXPORT_SYMBOL(rtnl_set_sk_err);
 752
 753int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
 754{
 755	struct nlattr *mx;
 756	int i, valid = 0;
 757
 758	/* nothing is dumped for dst_default_metrics, so just skip the loop */
 759	if (metrics == dst_default_metrics.metrics)
 760		return 0;
 761
 762	mx = nla_nest_start_noflag(skb, RTA_METRICS);
 763	if (mx == NULL)
 764		return -ENOBUFS;
 765
 766	for (i = 0; i < RTAX_MAX; i++) {
 767		if (metrics[i]) {
 768			if (i == RTAX_CC_ALGO - 1) {
 769				char tmp[TCP_CA_NAME_MAX], *name;
 770
 771				name = tcp_ca_get_name_by_key(metrics[i], tmp);
 772				if (!name)
 773					continue;
 774				if (nla_put_string(skb, i + 1, name))
 775					goto nla_put_failure;
 776			} else if (i == RTAX_FEATURES - 1) {
 777				u32 user_features = metrics[i] & RTAX_FEATURE_MASK;
 778
 779				if (!user_features)
 780					continue;
 781				BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK);
 782				if (nla_put_u32(skb, i + 1, user_features))
 783					goto nla_put_failure;
 784			} else {
 785				if (nla_put_u32(skb, i + 1, metrics[i]))
 786					goto nla_put_failure;
 787			}
 788			valid++;
 789		}
 790	}
 791
 792	if (!valid) {
 793		nla_nest_cancel(skb, mx);
 794		return 0;
 795	}
 796
 797	return nla_nest_end(skb, mx);
 798
 799nla_put_failure:
 800	nla_nest_cancel(skb, mx);
 801	return -EMSGSIZE;
 802}
 803EXPORT_SYMBOL(rtnetlink_put_metrics);
 804
 805int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
 806		       long expires, u32 error)
 807{
 808	struct rta_cacheinfo ci = {
 809		.rta_error = error,
 810		.rta_id =  id,
 811	};
 812
 813	if (dst) {
 814		ci.rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse);
 815		ci.rta_used = dst->__use;
 816		ci.rta_clntref = atomic_read(&dst->__refcnt);
 817	}
 818	if (expires) {
 819		unsigned long clock;
 820
 821		clock = jiffies_to_clock_t(abs(expires));
 822		clock = min_t(unsigned long, clock, INT_MAX);
 823		ci.rta_expires = (expires > 0) ? clock : -clock;
 824	}
 825	return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
 826}
 827EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
 828
 
 
 
 
 
 
 
 
 
 
 
 
 
 829static void set_operstate(struct net_device *dev, unsigned char transition)
 830{
 831	unsigned char operstate = dev->operstate;
 832
 833	switch (transition) {
 834	case IF_OPER_UP:
 835		if ((operstate == IF_OPER_DORMANT ||
 836		     operstate == IF_OPER_TESTING ||
 837		     operstate == IF_OPER_UNKNOWN) &&
 838		    !netif_dormant(dev) && !netif_testing(dev))
 839			operstate = IF_OPER_UP;
 840		break;
 841
 842	case IF_OPER_TESTING:
 843		if (operstate == IF_OPER_UP ||
 844		    operstate == IF_OPER_UNKNOWN)
 845			operstate = IF_OPER_TESTING;
 846		break;
 847
 848	case IF_OPER_DORMANT:
 849		if (operstate == IF_OPER_UP ||
 850		    operstate == IF_OPER_UNKNOWN)
 851			operstate = IF_OPER_DORMANT;
 852		break;
 853	}
 854
 855	if (dev->operstate != operstate) {
 856		write_lock_bh(&dev_base_lock);
 857		dev->operstate = operstate;
 858		write_unlock_bh(&dev_base_lock);
 859		netdev_state_change(dev);
 860	}
 861}
 862
 863static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
 864{
 865	return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
 866	       (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
 867}
 868
 869static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
 870					   const struct ifinfomsg *ifm)
 871{
 872	unsigned int flags = ifm->ifi_flags;
 873
 874	/* bugwards compatibility: ifi_change == 0 is treated as ~0 */
 875	if (ifm->ifi_change)
 876		flags = (flags & ifm->ifi_change) |
 877			(rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
 878
 879	return flags;
 880}
 881
 882static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
 883				 const struct rtnl_link_stats64 *b)
 884{
 885	a->rx_packets = b->rx_packets;
 886	a->tx_packets = b->tx_packets;
 887	a->rx_bytes = b->rx_bytes;
 888	a->tx_bytes = b->tx_bytes;
 889	a->rx_errors = b->rx_errors;
 890	a->tx_errors = b->tx_errors;
 891	a->rx_dropped = b->rx_dropped;
 892	a->tx_dropped = b->tx_dropped;
 893
 894	a->multicast = b->multicast;
 895	a->collisions = b->collisions;
 896
 897	a->rx_length_errors = b->rx_length_errors;
 898	a->rx_over_errors = b->rx_over_errors;
 899	a->rx_crc_errors = b->rx_crc_errors;
 900	a->rx_frame_errors = b->rx_frame_errors;
 901	a->rx_fifo_errors = b->rx_fifo_errors;
 902	a->rx_missed_errors = b->rx_missed_errors;
 903
 904	a->tx_aborted_errors = b->tx_aborted_errors;
 905	a->tx_carrier_errors = b->tx_carrier_errors;
 906	a->tx_fifo_errors = b->tx_fifo_errors;
 907	a->tx_heartbeat_errors = b->tx_heartbeat_errors;
 908	a->tx_window_errors = b->tx_window_errors;
 909
 910	a->rx_compressed = b->rx_compressed;
 911	a->tx_compressed = b->tx_compressed;
 912
 913	a->rx_nohandler = b->rx_nohandler;
 914}
 915
 916/* All VF info */
 917static inline int rtnl_vfinfo_size(const struct net_device *dev,
 918				   u32 ext_filter_mask)
 919{
 920	if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) {
 921		int num_vfs = dev_num_vf(dev->dev.parent);
 922		size_t size = nla_total_size(0);
 923		size += num_vfs *
 924			(nla_total_size(0) +
 925			 nla_total_size(sizeof(struct ifla_vf_mac)) +
 926			 nla_total_size(sizeof(struct ifla_vf_broadcast)) +
 927			 nla_total_size(sizeof(struct ifla_vf_vlan)) +
 928			 nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */
 929			 nla_total_size(MAX_VLAN_LIST_LEN *
 930					sizeof(struct ifla_vf_vlan_info)) +
 931			 nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
 932			 nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
 933			 nla_total_size(sizeof(struct ifla_vf_rate)) +
 934			 nla_total_size(sizeof(struct ifla_vf_link_state)) +
 935			 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
 936			 nla_total_size(0) + /* nest IFLA_VF_STATS */
 937			 /* IFLA_VF_STATS_RX_PACKETS */
 938			 nla_total_size_64bit(sizeof(__u64)) +
 939			 /* IFLA_VF_STATS_TX_PACKETS */
 940			 nla_total_size_64bit(sizeof(__u64)) +
 941			 /* IFLA_VF_STATS_RX_BYTES */
 942			 nla_total_size_64bit(sizeof(__u64)) +
 943			 /* IFLA_VF_STATS_TX_BYTES */
 944			 nla_total_size_64bit(sizeof(__u64)) +
 945			 /* IFLA_VF_STATS_BROADCAST */
 946			 nla_total_size_64bit(sizeof(__u64)) +
 947			 /* IFLA_VF_STATS_MULTICAST */
 948			 nla_total_size_64bit(sizeof(__u64)) +
 949			 /* IFLA_VF_STATS_RX_DROPPED */
 950			 nla_total_size_64bit(sizeof(__u64)) +
 951			 /* IFLA_VF_STATS_TX_DROPPED */
 952			 nla_total_size_64bit(sizeof(__u64)) +
 953			 nla_total_size(sizeof(struct ifla_vf_trust)));
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 954		return size;
 955	} else
 956		return 0;
 957}
 958
 959static size_t rtnl_port_size(const struct net_device *dev,
 960			     u32 ext_filter_mask)
 961{
 962	size_t port_size = nla_total_size(4)		/* PORT_VF */
 963		+ nla_total_size(PORT_PROFILE_MAX)	/* PORT_PROFILE */
 964		+ nla_total_size(PORT_UUID_MAX)		/* PORT_INSTANCE_UUID */
 965		+ nla_total_size(PORT_UUID_MAX)		/* PORT_HOST_UUID */
 966		+ nla_total_size(1)			/* PROT_VDP_REQUEST */
 967		+ nla_total_size(2);			/* PORT_VDP_RESPONSE */
 968	size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
 969	size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
 970		+ port_size;
 971	size_t port_self_size = nla_total_size(sizeof(struct nlattr))
 972		+ port_size;
 973
 974	if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
 975	    !(ext_filter_mask & RTEXT_FILTER_VF))
 976		return 0;
 977	if (dev_num_vf(dev->dev.parent))
 978		return port_self_size + vf_ports_size +
 979			vf_port_size * dev_num_vf(dev->dev.parent);
 980	else
 981		return port_self_size;
 982}
 983
 984static size_t rtnl_xdp_size(void)
 985{
 986	size_t xdp_size = nla_total_size(0) +	/* nest IFLA_XDP */
 987			  nla_total_size(1) +	/* XDP_ATTACHED */
 988			  nla_total_size(4) +	/* XDP_PROG_ID (or 1st mode) */
 989			  nla_total_size(4);	/* XDP_<mode>_PROG_ID */
 990
 991	return xdp_size;
 992}
 993
 994static size_t rtnl_prop_list_size(const struct net_device *dev)
 995{
 996	struct netdev_name_node *name_node;
 997	size_t size;
 998
 999	if (list_empty(&dev->name_node->list))
 
 
 
 
 
1000		return 0;
1001	size = nla_total_size(0);
1002	list_for_each_entry(name_node, &dev->name_node->list, list)
1003		size += nla_total_size(ALTIFNAMSIZ);
1004	return size;
1005}
1006
1007static size_t rtnl_proto_down_size(const struct net_device *dev)
1008{
1009	size_t size = nla_total_size(1);
1010
1011	if (dev->proto_down_reason)
1012		size += nla_total_size(0) + nla_total_size(4);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1013
1014	return size;
1015}
1016
1017static noinline size_t if_nlmsg_size(const struct net_device *dev,
1018				     u32 ext_filter_mask)
1019{
1020	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
1021	       + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
1022	       + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
1023	       + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
1024	       + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap))
1025	       + nla_total_size(sizeof(struct rtnl_link_stats))
1026	       + nla_total_size_64bit(sizeof(struct rtnl_link_stats64))
1027	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
1028	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
1029	       + nla_total_size(4) /* IFLA_TXQLEN */
1030	       + nla_total_size(4) /* IFLA_WEIGHT */
1031	       + nla_total_size(4) /* IFLA_MTU */
1032	       + nla_total_size(4) /* IFLA_LINK */
1033	       + nla_total_size(4) /* IFLA_MASTER */
1034	       + nla_total_size(1) /* IFLA_CARRIER */
1035	       + nla_total_size(4) /* IFLA_PROMISCUITY */
 
1036	       + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
1037	       + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
1038	       + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */
1039	       + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */
 
 
 
 
 
1040	       + nla_total_size(1) /* IFLA_OPERSTATE */
1041	       + nla_total_size(1) /* IFLA_LINKMODE */
1042	       + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
1043	       + nla_total_size(4) /* IFLA_LINK_NETNSID */
1044	       + nla_total_size(4) /* IFLA_GROUP */
1045	       + nla_total_size(ext_filter_mask
1046			        & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
1047	       + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
1048	       + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
1049	       + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
1050	       + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
1051	       + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
1052	       + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
1053	       + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
1054	       + rtnl_xdp_size() /* IFLA_XDP */
1055	       + nla_total_size(4)  /* IFLA_EVENT */
1056	       + nla_total_size(4)  /* IFLA_NEW_NETNSID */
1057	       + nla_total_size(4)  /* IFLA_NEW_IFINDEX */
1058	       + rtnl_proto_down_size(dev)  /* proto down */
1059	       + nla_total_size(4)  /* IFLA_TARGET_NETNSID */
1060	       + nla_total_size(4)  /* IFLA_CARRIER_UP_COUNT */
1061	       + nla_total_size(4)  /* IFLA_CARRIER_DOWN_COUNT */
1062	       + nla_total_size(4)  /* IFLA_MIN_MTU */
1063	       + nla_total_size(4)  /* IFLA_MAX_MTU */
1064	       + rtnl_prop_list_size(dev)
1065	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_PERM_ADDRESS */
 
 
 
1066	       + 0;
1067}
1068
1069static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
1070{
1071	struct nlattr *vf_ports;
1072	struct nlattr *vf_port;
1073	int vf;
1074	int err;
1075
1076	vf_ports = nla_nest_start_noflag(skb, IFLA_VF_PORTS);
1077	if (!vf_ports)
1078		return -EMSGSIZE;
1079
1080	for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
1081		vf_port = nla_nest_start_noflag(skb, IFLA_VF_PORT);
1082		if (!vf_port)
1083			goto nla_put_failure;
1084		if (nla_put_u32(skb, IFLA_PORT_VF, vf))
1085			goto nla_put_failure;
1086		err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
1087		if (err == -EMSGSIZE)
1088			goto nla_put_failure;
1089		if (err) {
1090			nla_nest_cancel(skb, vf_port);
1091			continue;
1092		}
1093		nla_nest_end(skb, vf_port);
1094	}
1095
1096	nla_nest_end(skb, vf_ports);
1097
1098	return 0;
1099
1100nla_put_failure:
1101	nla_nest_cancel(skb, vf_ports);
1102	return -EMSGSIZE;
1103}
1104
1105static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
1106{
1107	struct nlattr *port_self;
1108	int err;
1109
1110	port_self = nla_nest_start_noflag(skb, IFLA_PORT_SELF);
1111	if (!port_self)
1112		return -EMSGSIZE;
1113
1114	err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
1115	if (err) {
1116		nla_nest_cancel(skb, port_self);
1117		return (err == -EMSGSIZE) ? err : 0;
1118	}
1119
1120	nla_nest_end(skb, port_self);
1121
1122	return 0;
1123}
1124
1125static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
1126			  u32 ext_filter_mask)
1127{
1128	int err;
1129
1130	if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
1131	    !(ext_filter_mask & RTEXT_FILTER_VF))
1132		return 0;
1133
1134	err = rtnl_port_self_fill(skb, dev);
1135	if (err)
1136		return err;
1137
1138	if (dev_num_vf(dev->dev.parent)) {
1139		err = rtnl_vf_ports_fill(skb, dev);
1140		if (err)
1141			return err;
1142	}
1143
1144	return 0;
1145}
1146
1147static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
1148{
1149	int err;
1150	struct netdev_phys_item_id ppid;
1151
1152	err = dev_get_phys_port_id(dev, &ppid);
1153	if (err) {
1154		if (err == -EOPNOTSUPP)
1155			return 0;
1156		return err;
1157	}
1158
1159	if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
1160		return -EMSGSIZE;
1161
1162	return 0;
1163}
1164
1165static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1166{
1167	char name[IFNAMSIZ];
1168	int err;
1169
1170	err = dev_get_phys_port_name(dev, name, sizeof(name));
1171	if (err) {
1172		if (err == -EOPNOTSUPP)
1173			return 0;
1174		return err;
1175	}
1176
1177	if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name))
1178		return -EMSGSIZE;
1179
1180	return 0;
1181}
1182
1183static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1184{
1185	struct netdev_phys_item_id ppid = { };
1186	int err;
1187
1188	err = dev_get_port_parent_id(dev, &ppid, false);
1189	if (err) {
1190		if (err == -EOPNOTSUPP)
1191			return 0;
1192		return err;
1193	}
1194
1195	if (nla_put(skb, IFLA_PHYS_SWITCH_ID, ppid.id_len, ppid.id))
1196		return -EMSGSIZE;
1197
1198	return 0;
1199}
1200
1201static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
1202					      struct net_device *dev)
1203{
1204	struct rtnl_link_stats64 *sp;
1205	struct nlattr *attr;
1206
1207	attr = nla_reserve_64bit(skb, IFLA_STATS64,
1208				 sizeof(struct rtnl_link_stats64), IFLA_PAD);
1209	if (!attr)
1210		return -EMSGSIZE;
1211
1212	sp = nla_data(attr);
1213	dev_get_stats(dev, sp);
1214
1215	attr = nla_reserve(skb, IFLA_STATS,
1216			   sizeof(struct rtnl_link_stats));
1217	if (!attr)
1218		return -EMSGSIZE;
1219
1220	copy_rtnl_link_stats(nla_data(attr), sp);
1221
1222	return 0;
1223}
1224
1225static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
1226					       struct net_device *dev,
1227					       int vfs_num,
1228					       struct nlattr *vfinfo)
1229{
1230	struct ifla_vf_rss_query_en vf_rss_query_en;
1231	struct nlattr *vf, *vfstats, *vfvlanlist;
1232	struct ifla_vf_link_state vf_linkstate;
1233	struct ifla_vf_vlan_info vf_vlan_info;
1234	struct ifla_vf_spoofchk vf_spoofchk;
1235	struct ifla_vf_tx_rate vf_tx_rate;
1236	struct ifla_vf_stats vf_stats;
1237	struct ifla_vf_trust vf_trust;
1238	struct ifla_vf_vlan vf_vlan;
1239	struct ifla_vf_rate vf_rate;
1240	struct ifla_vf_mac vf_mac;
1241	struct ifla_vf_broadcast vf_broadcast;
1242	struct ifla_vf_info ivi;
1243	struct ifla_vf_guid node_guid;
1244	struct ifla_vf_guid port_guid;
1245
1246	memset(&ivi, 0, sizeof(ivi));
1247
1248	/* Not all SR-IOV capable drivers support the
1249	 * spoofcheck and "RSS query enable" query.  Preset to
1250	 * -1 so the user space tool can detect that the driver
1251	 * didn't report anything.
1252	 */
1253	ivi.spoofchk = -1;
1254	ivi.rss_query_en = -1;
1255	ivi.trusted = -1;
1256	/* The default value for VF link state is "auto"
1257	 * IFLA_VF_LINK_STATE_AUTO which equals zero
1258	 */
1259	ivi.linkstate = 0;
1260	/* VLAN Protocol by default is 802.1Q */
1261	ivi.vlan_proto = htons(ETH_P_8021Q);
1262	if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
1263		return 0;
1264
1265	memset(&vf_vlan_info, 0, sizeof(vf_vlan_info));
1266	memset(&node_guid, 0, sizeof(node_guid));
1267	memset(&port_guid, 0, sizeof(port_guid));
1268
1269	vf_mac.vf =
1270		vf_vlan.vf =
1271		vf_vlan_info.vf =
1272		vf_rate.vf =
1273		vf_tx_rate.vf =
1274		vf_spoofchk.vf =
1275		vf_linkstate.vf =
1276		vf_rss_query_en.vf =
1277		vf_trust.vf =
1278		node_guid.vf =
1279		port_guid.vf = ivi.vf;
1280
1281	memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1282	memcpy(vf_broadcast.broadcast, dev->broadcast, dev->addr_len);
1283	vf_vlan.vlan = ivi.vlan;
1284	vf_vlan.qos = ivi.qos;
1285	vf_vlan_info.vlan = ivi.vlan;
1286	vf_vlan_info.qos = ivi.qos;
1287	vf_vlan_info.vlan_proto = ivi.vlan_proto;
1288	vf_tx_rate.rate = ivi.max_tx_rate;
1289	vf_rate.min_tx_rate = ivi.min_tx_rate;
1290	vf_rate.max_tx_rate = ivi.max_tx_rate;
1291	vf_spoofchk.setting = ivi.spoofchk;
1292	vf_linkstate.link_state = ivi.linkstate;
1293	vf_rss_query_en.setting = ivi.rss_query_en;
1294	vf_trust.setting = ivi.trusted;
1295	vf = nla_nest_start_noflag(skb, IFLA_VF_INFO);
1296	if (!vf)
1297		goto nla_put_vfinfo_failure;
1298	if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1299	    nla_put(skb, IFLA_VF_BROADCAST, sizeof(vf_broadcast), &vf_broadcast) ||
1300	    nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1301	    nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1302		    &vf_rate) ||
1303	    nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1304		    &vf_tx_rate) ||
1305	    nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1306		    &vf_spoofchk) ||
1307	    nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1308		    &vf_linkstate) ||
1309	    nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1310		    sizeof(vf_rss_query_en),
1311		    &vf_rss_query_en) ||
1312	    nla_put(skb, IFLA_VF_TRUST,
1313		    sizeof(vf_trust), &vf_trust))
1314		goto nla_put_vf_failure;
1315
1316	if (dev->netdev_ops->ndo_get_vf_guid &&
1317	    !dev->netdev_ops->ndo_get_vf_guid(dev, vfs_num, &node_guid,
1318					      &port_guid)) {
1319		if (nla_put(skb, IFLA_VF_IB_NODE_GUID, sizeof(node_guid),
1320			    &node_guid) ||
1321		    nla_put(skb, IFLA_VF_IB_PORT_GUID, sizeof(port_guid),
1322			    &port_guid))
1323			goto nla_put_vf_failure;
1324	}
1325	vfvlanlist = nla_nest_start_noflag(skb, IFLA_VF_VLAN_LIST);
1326	if (!vfvlanlist)
1327		goto nla_put_vf_failure;
1328	if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info),
1329		    &vf_vlan_info)) {
1330		nla_nest_cancel(skb, vfvlanlist);
1331		goto nla_put_vf_failure;
1332	}
1333	nla_nest_end(skb, vfvlanlist);
1334	memset(&vf_stats, 0, sizeof(vf_stats));
1335	if (dev->netdev_ops->ndo_get_vf_stats)
1336		dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
1337						&vf_stats);
1338	vfstats = nla_nest_start_noflag(skb, IFLA_VF_STATS);
1339	if (!vfstats)
1340		goto nla_put_vf_failure;
1341	if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS,
1342			      vf_stats.rx_packets, IFLA_VF_STATS_PAD) ||
1343	    nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS,
1344			      vf_stats.tx_packets, IFLA_VF_STATS_PAD) ||
1345	    nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES,
1346			      vf_stats.rx_bytes, IFLA_VF_STATS_PAD) ||
1347	    nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES,
1348			      vf_stats.tx_bytes, IFLA_VF_STATS_PAD) ||
1349	    nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST,
1350			      vf_stats.broadcast, IFLA_VF_STATS_PAD) ||
1351	    nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST,
1352			      vf_stats.multicast, IFLA_VF_STATS_PAD) ||
1353	    nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_DROPPED,
1354			      vf_stats.rx_dropped, IFLA_VF_STATS_PAD) ||
1355	    nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_DROPPED,
1356			      vf_stats.tx_dropped, IFLA_VF_STATS_PAD)) {
1357		nla_nest_cancel(skb, vfstats);
1358		goto nla_put_vf_failure;
 
 
 
1359	}
1360	nla_nest_end(skb, vfstats);
1361	nla_nest_end(skb, vf);
1362	return 0;
1363
1364nla_put_vf_failure:
1365	nla_nest_cancel(skb, vf);
1366nla_put_vfinfo_failure:
1367	nla_nest_cancel(skb, vfinfo);
1368	return -EMSGSIZE;
1369}
1370
1371static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb,
1372					   struct net_device *dev,
1373					   u32 ext_filter_mask)
1374{
1375	struct nlattr *vfinfo;
1376	int i, num_vfs;
1377
1378	if (!dev->dev.parent || ((ext_filter_mask & RTEXT_FILTER_VF) == 0))
1379		return 0;
1380
1381	num_vfs = dev_num_vf(dev->dev.parent);
1382	if (nla_put_u32(skb, IFLA_NUM_VF, num_vfs))
1383		return -EMSGSIZE;
1384
1385	if (!dev->netdev_ops->ndo_get_vf_config)
1386		return 0;
1387
1388	vfinfo = nla_nest_start_noflag(skb, IFLA_VFINFO_LIST);
1389	if (!vfinfo)
1390		return -EMSGSIZE;
1391
1392	for (i = 0; i < num_vfs; i++) {
1393		if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
 
1394			return -EMSGSIZE;
 
1395	}
1396
1397	nla_nest_end(skb, vfinfo);
1398	return 0;
1399}
1400
1401static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
 
1402{
1403	struct rtnl_link_ifmap map;
1404
1405	memset(&map, 0, sizeof(map));
1406	map.mem_start   = dev->mem_start;
1407	map.mem_end     = dev->mem_end;
1408	map.base_addr   = dev->base_addr;
1409	map.irq         = dev->irq;
1410	map.dma         = dev->dma;
1411	map.port        = dev->if_port;
1412
1413	if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
1414		return -EMSGSIZE;
1415
1416	return 0;
1417}
1418
1419static u32 rtnl_xdp_prog_skb(struct net_device *dev)
1420{
1421	const struct bpf_prog *generic_xdp_prog;
 
1422
1423	ASSERT_RTNL();
 
 
 
 
1424
1425	generic_xdp_prog = rtnl_dereference(dev->xdp_prog);
1426	if (!generic_xdp_prog)
1427		return 0;
1428	return generic_xdp_prog->aux->id;
1429}
1430
1431static u32 rtnl_xdp_prog_drv(struct net_device *dev)
1432{
1433	return dev_xdp_prog_id(dev, XDP_MODE_DRV);
1434}
1435
1436static u32 rtnl_xdp_prog_hw(struct net_device *dev)
1437{
1438	return dev_xdp_prog_id(dev, XDP_MODE_HW);
1439}
1440
1441static int rtnl_xdp_report_one(struct sk_buff *skb, struct net_device *dev,
1442			       u32 *prog_id, u8 *mode, u8 tgt_mode, u32 attr,
1443			       u32 (*get_prog_id)(struct net_device *dev))
1444{
1445	u32 curr_id;
1446	int err;
1447
1448	curr_id = get_prog_id(dev);
1449	if (!curr_id)
1450		return 0;
1451
1452	*prog_id = curr_id;
1453	err = nla_put_u32(skb, attr, curr_id);
1454	if (err)
1455		return err;
1456
1457	if (*mode != XDP_ATTACHED_NONE)
1458		*mode = XDP_ATTACHED_MULTI;
1459	else
1460		*mode = tgt_mode;
1461
1462	return 0;
1463}
1464
1465static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
1466{
1467	struct nlattr *xdp;
1468	u32 prog_id;
1469	int err;
1470	u8 mode;
1471
1472	xdp = nla_nest_start_noflag(skb, IFLA_XDP);
1473	if (!xdp)
1474		return -EMSGSIZE;
1475
1476	prog_id = 0;
1477	mode = XDP_ATTACHED_NONE;
1478	err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_SKB,
1479				  IFLA_XDP_SKB_PROG_ID, rtnl_xdp_prog_skb);
1480	if (err)
1481		goto err_cancel;
1482	err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_DRV,
1483				  IFLA_XDP_DRV_PROG_ID, rtnl_xdp_prog_drv);
1484	if (err)
1485		goto err_cancel;
1486	err = rtnl_xdp_report_one(skb, dev, &prog_id, &mode, XDP_ATTACHED_HW,
1487				  IFLA_XDP_HW_PROG_ID, rtnl_xdp_prog_hw);
1488	if (err)
1489		goto err_cancel;
1490
1491	err = nla_put_u8(skb, IFLA_XDP_ATTACHED, mode);
1492	if (err)
1493		goto err_cancel;
1494
1495	if (prog_id && mode != XDP_ATTACHED_MULTI) {
1496		err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id);
1497		if (err)
1498			goto err_cancel;
1499	}
1500
1501	nla_nest_end(skb, xdp);
1502	return 0;
1503
1504err_cancel:
1505	nla_nest_cancel(skb, xdp);
1506	return err;
1507}
1508
1509static u32 rtnl_get_event(unsigned long event)
1510{
1511	u32 rtnl_event_type = IFLA_EVENT_NONE;
1512
1513	switch (event) {
1514	case NETDEV_REBOOT:
1515		rtnl_event_type = IFLA_EVENT_REBOOT;
1516		break;
1517	case NETDEV_FEAT_CHANGE:
1518		rtnl_event_type = IFLA_EVENT_FEATURES;
1519		break;
1520	case NETDEV_BONDING_FAILOVER:
1521		rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER;
1522		break;
1523	case NETDEV_NOTIFY_PEERS:
1524		rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS;
1525		break;
1526	case NETDEV_RESEND_IGMP:
1527		rtnl_event_type = IFLA_EVENT_IGMP_RESEND;
1528		break;
1529	case NETDEV_CHANGEINFODATA:
1530		rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS;
1531		break;
1532	default:
1533		break;
1534	}
1535
1536	return rtnl_event_type;
1537}
1538
1539static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev)
1540{
1541	const struct net_device *upper_dev;
1542	int ret = 0;
1543
1544	rcu_read_lock();
1545
1546	upper_dev = netdev_master_upper_dev_get_rcu(dev);
1547	if (upper_dev)
1548		ret = nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex);
 
1549
1550	rcu_read_unlock();
1551	return ret;
1552}
1553
1554static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev,
1555			  bool force)
1556{
1557	int ifindex = dev_get_iflink(dev);
1558
1559	if (force || dev->ifindex != ifindex)
1560		return nla_put_u32(skb, IFLA_LINK, ifindex);
1561
1562	return 0;
1563}
1564
1565static noinline_for_stack int nla_put_ifalias(struct sk_buff *skb,
1566					      struct net_device *dev)
1567{
1568	char buf[IFALIASZ];
1569	int ret;
1570
1571	ret = dev_get_alias(dev, buf, sizeof(buf));
1572	return ret > 0 ? nla_put_string(skb, IFLA_IFALIAS, buf) : 0;
1573}
1574
1575static int rtnl_fill_link_netnsid(struct sk_buff *skb,
1576				  const struct net_device *dev,
1577				  struct net *src_net, gfp_t gfp)
1578{
1579	bool put_iflink = false;
1580
1581	if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net) {
1582		struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1583
1584		if (!net_eq(dev_net(dev), link_net)) {
1585			int id = peernet2id_alloc(src_net, link_net, gfp);
1586
1587			if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1588				return -EMSGSIZE;
1589
1590			put_iflink = true;
1591		}
1592	}
1593
1594	return nla_put_iflink(skb, dev, put_iflink);
1595}
1596
1597static int rtnl_fill_link_af(struct sk_buff *skb,
1598			     const struct net_device *dev,
1599			     u32 ext_filter_mask)
1600{
1601	const struct rtnl_af_ops *af_ops;
1602	struct nlattr *af_spec;
1603
1604	af_spec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
1605	if (!af_spec)
1606		return -EMSGSIZE;
1607
1608	list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
1609		struct nlattr *af;
1610		int err;
1611
1612		if (!af_ops->fill_link_af)
1613			continue;
1614
1615		af = nla_nest_start_noflag(skb, af_ops->family);
1616		if (!af)
1617			return -EMSGSIZE;
1618
1619		err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1620		/*
1621		 * Caller may return ENODATA to indicate that there
1622		 * was no data to be dumped. This is not an error, it
1623		 * means we should trim the attribute header and
1624		 * continue.
1625		 */
1626		if (err == -ENODATA)
1627			nla_nest_cancel(skb, af);
1628		else if (err < 0)
1629			return -EMSGSIZE;
1630
1631		nla_nest_end(skb, af);
1632	}
1633
1634	nla_nest_end(skb, af_spec);
1635	return 0;
1636}
1637
1638static int rtnl_fill_alt_ifnames(struct sk_buff *skb,
1639				 const struct net_device *dev)
1640{
1641	struct netdev_name_node *name_node;
1642	int count = 0;
1643
1644	list_for_each_entry(name_node, &dev->name_node->list, list) {
1645		if (nla_put_string(skb, IFLA_ALT_IFNAME, name_node->name))
1646			return -EMSGSIZE;
1647		count++;
1648	}
1649	return count;
1650}
1651
 
1652static int rtnl_fill_prop_list(struct sk_buff *skb,
1653			       const struct net_device *dev)
1654{
1655	struct nlattr *prop_list;
1656	int ret;
1657
1658	prop_list = nla_nest_start(skb, IFLA_PROP_LIST);
1659	if (!prop_list)
1660		return -EMSGSIZE;
1661
1662	ret = rtnl_fill_alt_ifnames(skb, dev);
1663	if (ret <= 0)
1664		goto nest_cancel;
1665
1666	nla_nest_end(skb, prop_list);
1667	return 0;
1668
1669nest_cancel:
1670	nla_nest_cancel(skb, prop_list);
1671	return ret;
1672}
1673
1674static int rtnl_fill_proto_down(struct sk_buff *skb,
1675				const struct net_device *dev)
1676{
1677	struct nlattr *pr;
1678	u32 preason;
1679
1680	if (nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down))
1681		goto nla_put_failure;
1682
1683	preason = dev->proto_down_reason;
1684	if (!preason)
1685		return 0;
1686
1687	pr = nla_nest_start(skb, IFLA_PROTO_DOWN_REASON);
1688	if (!pr)
1689		return -EMSGSIZE;
1690
1691	if (nla_put_u32(skb, IFLA_PROTO_DOWN_REASON_VALUE, preason)) {
1692		nla_nest_cancel(skb, pr);
1693		goto nla_put_failure;
1694	}
1695
1696	nla_nest_end(skb, pr);
1697	return 0;
1698
1699nla_put_failure:
1700	return -EMSGSIZE;
1701}
1702
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1703static int rtnl_fill_ifinfo(struct sk_buff *skb,
1704			    struct net_device *dev, struct net *src_net,
1705			    int type, u32 pid, u32 seq, u32 change,
1706			    unsigned int flags, u32 ext_filter_mask,
1707			    u32 event, int *new_nsid, int new_ifindex,
1708			    int tgt_netnsid, gfp_t gfp)
1709{
 
1710	struct ifinfomsg *ifm;
1711	struct nlmsghdr *nlh;
 
1712
1713	ASSERT_RTNL();
1714	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1715	if (nlh == NULL)
1716		return -EMSGSIZE;
1717
1718	ifm = nlmsg_data(nlh);
1719	ifm->ifi_family = AF_UNSPEC;
1720	ifm->__ifi_pad = 0;
1721	ifm->ifi_type = dev->type;
1722	ifm->ifi_index = dev->ifindex;
1723	ifm->ifi_flags = dev_get_flags(dev);
1724	ifm->ifi_change = change;
1725
1726	if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_TARGET_NETNSID, tgt_netnsid))
1727		goto nla_put_failure;
1728
1729	if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1730	    nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
 
 
 
1731	    nla_put_u8(skb, IFLA_OPERSTATE,
1732		       netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1733	    nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1734	    nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1735	    nla_put_u32(skb, IFLA_MIN_MTU, dev->min_mtu) ||
1736	    nla_put_u32(skb, IFLA_MAX_MTU, dev->max_mtu) ||
1737	    nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1738	    nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1739	    nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1740	    nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
1741	    nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1742#ifdef CONFIG_RPS
1743	    nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
 
1744#endif
1745	    put_master_ifindex(skb, dev) ||
1746	    nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1747	    (dev->qdisc &&
1748	     nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1749	    nla_put_ifalias(skb, dev) ||
1750	    nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1751			atomic_read(&dev->carrier_up_count) +
1752			atomic_read(&dev->carrier_down_count)) ||
1753	    nla_put_u32(skb, IFLA_CARRIER_UP_COUNT,
1754			atomic_read(&dev->carrier_up_count)) ||
1755	    nla_put_u32(skb, IFLA_CARRIER_DOWN_COUNT,
1756			atomic_read(&dev->carrier_down_count)))
1757		goto nla_put_failure;
1758
1759	if (rtnl_fill_proto_down(skb, dev))
1760		goto nla_put_failure;
1761
1762	if (event != IFLA_EVENT_NONE) {
1763		if (nla_put_u32(skb, IFLA_EVENT, event))
1764			goto nla_put_failure;
1765	}
1766
1767	if (rtnl_fill_link_ifmap(skb, dev))
1768		goto nla_put_failure;
1769
1770	if (dev->addr_len) {
1771		if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1772		    nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1773			goto nla_put_failure;
1774	}
1775
1776	if (rtnl_phys_port_id_fill(skb, dev))
1777		goto nla_put_failure;
1778
1779	if (rtnl_phys_port_name_fill(skb, dev))
1780		goto nla_put_failure;
1781
1782	if (rtnl_phys_switch_id_fill(skb, dev))
1783		goto nla_put_failure;
1784
1785	if (rtnl_fill_stats(skb, dev))
1786		goto nla_put_failure;
1787
1788	if (rtnl_fill_vf(skb, dev, ext_filter_mask))
1789		goto nla_put_failure;
1790
1791	if (rtnl_port_fill(skb, dev, ext_filter_mask))
1792		goto nla_put_failure;
1793
1794	if (rtnl_xdp_fill(skb, dev))
1795		goto nla_put_failure;
1796
1797	if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1798		if (rtnl_link_fill(skb, dev) < 0)
1799			goto nla_put_failure;
1800	}
1801
1802	if (rtnl_fill_link_netnsid(skb, dev, src_net, gfp))
1803		goto nla_put_failure;
1804
1805	if (new_nsid &&
1806	    nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0)
1807		goto nla_put_failure;
1808	if (new_ifindex &&
1809	    nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0)
1810		goto nla_put_failure;
1811
1812	if (memchr_inv(dev->perm_addr, '\0', dev->addr_len) &&
1813	    nla_put(skb, IFLA_PERM_ADDRESS, dev->addr_len, dev->perm_addr))
1814		goto nla_put_failure;
1815
1816	rcu_read_lock();
 
 
 
 
 
1817	if (rtnl_fill_link_af(skb, dev, ext_filter_mask))
1818		goto nla_put_failure_rcu;
1819	rcu_read_unlock();
1820
1821	if (rtnl_fill_prop_list(skb, dev))
1822		goto nla_put_failure;
 
1823
1824	if (dev->dev.parent &&
1825	    nla_put_string(skb, IFLA_PARENT_DEV_NAME,
1826			   dev_name(dev->dev.parent)))
1827		goto nla_put_failure;
1828
1829	if (dev->dev.parent && dev->dev.parent->bus &&
1830	    nla_put_string(skb, IFLA_PARENT_DEV_BUS_NAME,
1831			   dev->dev.parent->bus->name))
1832		goto nla_put_failure;
1833
 
 
 
 
 
 
1834	nlmsg_end(skb, nlh);
1835	return 0;
1836
1837nla_put_failure_rcu:
1838	rcu_read_unlock();
1839nla_put_failure:
1840	nlmsg_cancel(skb, nlh);
1841	return -EMSGSIZE;
1842}
1843
1844static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
 
1845	[IFLA_IFNAME]		= { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1846	[IFLA_ADDRESS]		= { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1847	[IFLA_BROADCAST]	= { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1848	[IFLA_MAP]		= { .len = sizeof(struct rtnl_link_ifmap) },
1849	[IFLA_MTU]		= { .type = NLA_U32 },
1850	[IFLA_LINK]		= { .type = NLA_U32 },
1851	[IFLA_MASTER]		= { .type = NLA_U32 },
1852	[IFLA_CARRIER]		= { .type = NLA_U8 },
1853	[IFLA_TXQLEN]		= { .type = NLA_U32 },
1854	[IFLA_WEIGHT]		= { .type = NLA_U32 },
1855	[IFLA_OPERSTATE]	= { .type = NLA_U8 },
1856	[IFLA_LINKMODE]		= { .type = NLA_U8 },
1857	[IFLA_LINKINFO]		= { .type = NLA_NESTED },
1858	[IFLA_NET_NS_PID]	= { .type = NLA_U32 },
1859	[IFLA_NET_NS_FD]	= { .type = NLA_U32 },
1860	/* IFLA_IFALIAS is a string, but policy is set to NLA_BINARY to
1861	 * allow 0-length string (needed to remove an alias).
1862	 */
1863	[IFLA_IFALIAS]	        = { .type = NLA_BINARY, .len = IFALIASZ - 1 },
1864	[IFLA_VFINFO_LIST]	= {. type = NLA_NESTED },
1865	[IFLA_VF_PORTS]		= { .type = NLA_NESTED },
1866	[IFLA_PORT_SELF]	= { .type = NLA_NESTED },
1867	[IFLA_AF_SPEC]		= { .type = NLA_NESTED },
1868	[IFLA_EXT_MASK]		= { .type = NLA_U32 },
1869	[IFLA_PROMISCUITY]	= { .type = NLA_U32 },
1870	[IFLA_NUM_TX_QUEUES]	= { .type = NLA_U32 },
1871	[IFLA_NUM_RX_QUEUES]	= { .type = NLA_U32 },
1872	[IFLA_GSO_MAX_SEGS]	= { .type = NLA_U32 },
1873	[IFLA_GSO_MAX_SIZE]	= { .type = NLA_U32 },
1874	[IFLA_PHYS_PORT_ID]	= { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1875	[IFLA_CARRIER_CHANGES]	= { .type = NLA_U32 },  /* ignored */
1876	[IFLA_PHYS_SWITCH_ID]	= { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1877	[IFLA_LINK_NETNSID]	= { .type = NLA_S32 },
1878	[IFLA_PROTO_DOWN]	= { .type = NLA_U8 },
1879	[IFLA_XDP]		= { .type = NLA_NESTED },
1880	[IFLA_EVENT]		= { .type = NLA_U32 },
1881	[IFLA_GROUP]		= { .type = NLA_U32 },
1882	[IFLA_TARGET_NETNSID]	= { .type = NLA_S32 },
1883	[IFLA_CARRIER_UP_COUNT]	= { .type = NLA_U32 },
1884	[IFLA_CARRIER_DOWN_COUNT] = { .type = NLA_U32 },
1885	[IFLA_MIN_MTU]		= { .type = NLA_U32 },
1886	[IFLA_MAX_MTU]		= { .type = NLA_U32 },
1887	[IFLA_PROP_LIST]	= { .type = NLA_NESTED },
1888	[IFLA_ALT_IFNAME]	= { .type = NLA_STRING,
1889				    .len = ALTIFNAMSIZ - 1 },
1890	[IFLA_PERM_ADDRESS]	= { .type = NLA_REJECT },
1891	[IFLA_PROTO_DOWN_REASON] = { .type = NLA_NESTED },
1892	[IFLA_NEW_IFINDEX]	= NLA_POLICY_MIN(NLA_S32, 1),
1893	[IFLA_PARENT_DEV_NAME]	= { .type = NLA_NUL_STRING },
 
 
 
 
 
 
1894};
1895
1896static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1897	[IFLA_INFO_KIND]	= { .type = NLA_STRING },
1898	[IFLA_INFO_DATA]	= { .type = NLA_NESTED },
1899	[IFLA_INFO_SLAVE_KIND]	= { .type = NLA_STRING },
1900	[IFLA_INFO_SLAVE_DATA]	= { .type = NLA_NESTED },
1901};
1902
1903static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1904	[IFLA_VF_MAC]		= { .len = sizeof(struct ifla_vf_mac) },
1905	[IFLA_VF_BROADCAST]	= { .type = NLA_REJECT },
1906	[IFLA_VF_VLAN]		= { .len = sizeof(struct ifla_vf_vlan) },
1907	[IFLA_VF_VLAN_LIST]     = { .type = NLA_NESTED },
1908	[IFLA_VF_TX_RATE]	= { .len = sizeof(struct ifla_vf_tx_rate) },
1909	[IFLA_VF_SPOOFCHK]	= { .len = sizeof(struct ifla_vf_spoofchk) },
1910	[IFLA_VF_RATE]		= { .len = sizeof(struct ifla_vf_rate) },
1911	[IFLA_VF_LINK_STATE]	= { .len = sizeof(struct ifla_vf_link_state) },
1912	[IFLA_VF_RSS_QUERY_EN]	= { .len = sizeof(struct ifla_vf_rss_query_en) },
1913	[IFLA_VF_STATS]		= { .type = NLA_NESTED },
1914	[IFLA_VF_TRUST]		= { .len = sizeof(struct ifla_vf_trust) },
1915	[IFLA_VF_IB_NODE_GUID]	= { .len = sizeof(struct ifla_vf_guid) },
1916	[IFLA_VF_IB_PORT_GUID]	= { .len = sizeof(struct ifla_vf_guid) },
1917};
1918
1919static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1920	[IFLA_PORT_VF]		= { .type = NLA_U32 },
1921	[IFLA_PORT_PROFILE]	= { .type = NLA_STRING,
1922				    .len = PORT_PROFILE_MAX },
1923	[IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1924				      .len = PORT_UUID_MAX },
1925	[IFLA_PORT_HOST_UUID]	= { .type = NLA_STRING,
1926				    .len = PORT_UUID_MAX },
1927	[IFLA_PORT_REQUEST]	= { .type = NLA_U8, },
1928	[IFLA_PORT_RESPONSE]	= { .type = NLA_U16, },
1929
1930	/* Unused, but we need to keep it here since user space could
1931	 * fill it. It's also broken with regard to NLA_BINARY use in
1932	 * combination with structs.
1933	 */
1934	[IFLA_PORT_VSI_TYPE]	= { .type = NLA_BINARY,
1935				    .len = sizeof(struct ifla_port_vsi) },
1936};
1937
1938static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
1939	[IFLA_XDP_UNSPEC]	= { .strict_start_type = IFLA_XDP_EXPECTED_FD },
1940	[IFLA_XDP_FD]		= { .type = NLA_S32 },
1941	[IFLA_XDP_EXPECTED_FD]	= { .type = NLA_S32 },
1942	[IFLA_XDP_ATTACHED]	= { .type = NLA_U8 },
1943	[IFLA_XDP_FLAGS]	= { .type = NLA_U32 },
1944	[IFLA_XDP_PROG_ID]	= { .type = NLA_U32 },
1945};
1946
1947static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
 
1948{
1949	const struct rtnl_link_ops *ops = NULL;
1950	struct nlattr *linfo[IFLA_INFO_MAX + 1];
 
1951
1952	if (nla_parse_nested_deprecated(linfo, IFLA_INFO_MAX, nla, ifla_info_policy, NULL) < 0)
1953		return NULL;
1954
1955	if (linfo[IFLA_INFO_KIND]) {
1956		char kind[MODULE_NAME_LEN];
1957
1958		nla_strscpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
1959		ops = rtnl_link_ops_get(kind);
1960	}
1961
1962	return ops;
1963}
1964
1965static bool link_master_filtered(struct net_device *dev, int master_idx)
1966{
1967	struct net_device *master;
1968
1969	if (!master_idx)
1970		return false;
1971
1972	master = netdev_master_upper_dev_get(dev);
 
 
 
 
 
 
 
1973	if (!master || master->ifindex != master_idx)
1974		return true;
1975
1976	return false;
1977}
1978
1979static bool link_kind_filtered(const struct net_device *dev,
1980			       const struct rtnl_link_ops *kind_ops)
1981{
1982	if (kind_ops && dev->rtnl_link_ops != kind_ops)
1983		return true;
1984
1985	return false;
1986}
1987
1988static bool link_dump_filtered(struct net_device *dev,
1989			       int master_idx,
1990			       const struct rtnl_link_ops *kind_ops)
1991{
1992	if (link_master_filtered(dev, master_idx) ||
1993	    link_kind_filtered(dev, kind_ops))
1994		return true;
1995
1996	return false;
1997}
1998
1999/**
2000 * rtnl_get_net_ns_capable - Get netns if sufficiently privileged.
2001 * @sk: netlink socket
2002 * @netnsid: network namespace identifier
2003 *
2004 * Returns the network namespace identified by netnsid on success or an error
2005 * pointer on failure.
2006 */
2007struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid)
2008{
2009	struct net *net;
2010
2011	net = get_net_ns_by_id(sock_net(sk), netnsid);
2012	if (!net)
2013		return ERR_PTR(-EINVAL);
2014
2015	/* For now, the caller is required to have CAP_NET_ADMIN in
2016	 * the user namespace owning the target net ns.
2017	 */
2018	if (!sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN)) {
2019		put_net(net);
2020		return ERR_PTR(-EACCES);
2021	}
2022	return net;
2023}
2024EXPORT_SYMBOL_GPL(rtnl_get_net_ns_capable);
2025
2026static int rtnl_valid_dump_ifinfo_req(const struct nlmsghdr *nlh,
2027				      bool strict_check, struct nlattr **tb,
2028				      struct netlink_ext_ack *extack)
2029{
2030	int hdrlen;
2031
2032	if (strict_check) {
2033		struct ifinfomsg *ifm;
2034
2035		if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
2036			NL_SET_ERR_MSG(extack, "Invalid header for link dump");
2037			return -EINVAL;
2038		}
2039
2040		ifm = nlmsg_data(nlh);
2041		if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
2042		    ifm->ifi_change) {
2043			NL_SET_ERR_MSG(extack, "Invalid values in header for link dump request");
2044			return -EINVAL;
2045		}
2046		if (ifm->ifi_index) {
2047			NL_SET_ERR_MSG(extack, "Filter by device index not supported for link dumps");
2048			return -EINVAL;
2049		}
2050
2051		return nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb,
2052						     IFLA_MAX, ifla_policy,
2053						     extack);
2054	}
2055
2056	/* A hack to preserve kernel<->userspace interface.
2057	 * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
2058	 * However, before Linux v3.9 the code here assumed rtgenmsg and that's
2059	 * what iproute2 < v3.9.0 used.
2060	 * We can detect the old iproute2. Even including the IFLA_EXT_MASK
2061	 * attribute, its netlink message is shorter than struct ifinfomsg.
2062	 */
2063	hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
2064		 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
2065
2066	return nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy,
2067				      extack);
2068}
2069
2070static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
2071{
2072	struct netlink_ext_ack *extack = cb->extack;
 
2073	const struct nlmsghdr *nlh = cb->nlh;
2074	struct net *net = sock_net(skb->sk);
2075	struct net *tgt_net = net;
2076	int h, s_h;
2077	int idx = 0, s_idx;
2078	struct net_device *dev;
2079	struct hlist_head *head;
2080	struct nlattr *tb[IFLA_MAX+1];
 
 
 
 
2081	u32 ext_filter_mask = 0;
2082	const struct rtnl_link_ops *kind_ops = NULL;
2083	unsigned int flags = NLM_F_MULTI;
2084	int master_idx = 0;
2085	int netnsid = -1;
2086	int err, i;
2087
2088	s_h = cb->args[0];
2089	s_idx = cb->args[1];
2090
2091	err = rtnl_valid_dump_ifinfo_req(nlh, cb->strict_check, tb, extack);
2092	if (err < 0) {
2093		if (cb->strict_check)
2094			return err;
2095
2096		goto walk_entries;
2097	}
2098
2099	for (i = 0; i <= IFLA_MAX; ++i) {
2100		if (!tb[i])
2101			continue;
2102
2103		/* new attributes should only be added with strict checking */
2104		switch (i) {
2105		case IFLA_TARGET_NETNSID:
2106			netnsid = nla_get_s32(tb[i]);
2107			tgt_net = rtnl_get_net_ns_capable(skb->sk, netnsid);
2108			if (IS_ERR(tgt_net)) {
2109				NL_SET_ERR_MSG(extack, "Invalid target network namespace id");
2110				return PTR_ERR(tgt_net);
 
 
2111			}
2112			break;
2113		case IFLA_EXT_MASK:
2114			ext_filter_mask = nla_get_u32(tb[i]);
2115			break;
2116		case IFLA_MASTER:
2117			master_idx = nla_get_u32(tb[i]);
2118			break;
2119		case IFLA_LINKINFO:
2120			kind_ops = linkinfo_to_kind_ops(tb[i]);
2121			break;
2122		default:
2123			if (cb->strict_check) {
2124				NL_SET_ERR_MSG(extack, "Unsupported attribute in link dump request");
2125				return -EINVAL;
 
2126			}
2127		}
2128	}
2129
2130	if (master_idx || kind_ops)
2131		flags |= NLM_F_DUMP_FILTERED;
2132
2133walk_entries:
2134	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
2135		idx = 0;
2136		head = &tgt_net->dev_index_head[h];
2137		hlist_for_each_entry(dev, head, index_hlist) {
2138			if (link_dump_filtered(dev, master_idx, kind_ops))
2139				goto cont;
2140			if (idx < s_idx)
2141				goto cont;
2142			err = rtnl_fill_ifinfo(skb, dev, net,
2143					       RTM_NEWLINK,
2144					       NETLINK_CB(cb->skb).portid,
2145					       nlh->nlmsg_seq, 0, flags,
2146					       ext_filter_mask, 0, NULL, 0,
2147					       netnsid, GFP_KERNEL);
2148
2149			if (err < 0) {
2150				if (likely(skb->len))
2151					goto out;
2152
2153				goto out_err;
2154			}
2155cont:
2156			idx++;
2157		}
2158	}
2159out:
2160	err = skb->len;
2161out_err:
2162	cb->args[1] = idx;
2163	cb->args[0] = h;
2164	cb->seq = tgt_net->dev_base_seq;
2165	nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 
 
 
 
 
2166	if (netnsid >= 0)
2167		put_net(tgt_net);
2168
2169	return err;
2170}
2171
2172int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
2173			struct netlink_ext_ack *exterr)
2174{
2175	return nla_parse_deprecated(tb, IFLA_MAX, head, len, ifla_policy,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2176				    exterr);
2177}
2178EXPORT_SYMBOL(rtnl_nla_parse_ifla);
2179
2180struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
2181{
2182	struct net *net;
 
2183	/* Examine the link attributes and figure out which
2184	 * network namespace we are talking about.
2185	 */
2186	if (tb[IFLA_NET_NS_PID])
2187		net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
2188	else if (tb[IFLA_NET_NS_FD])
2189		net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
2190	else
 
 
 
 
 
 
 
 
2191		net = get_net(src_net);
 
2192	return net;
2193}
2194EXPORT_SYMBOL(rtnl_link_get_net);
2195
2196/* Figure out which network namespace we are talking about by
2197 * examining the link attributes in the following order:
2198 *
2199 * 1. IFLA_NET_NS_PID
2200 * 2. IFLA_NET_NS_FD
2201 * 3. IFLA_TARGET_NETNSID
2202 */
2203static struct net *rtnl_link_get_net_by_nlattr(struct net *src_net,
2204					       struct nlattr *tb[])
2205{
2206	struct net *net;
2207
2208	if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD])
2209		return rtnl_link_get_net(src_net, tb);
2210
2211	if (!tb[IFLA_TARGET_NETNSID])
2212		return get_net(src_net);
2213
2214	net = get_net_ns_by_id(src_net, nla_get_u32(tb[IFLA_TARGET_NETNSID]));
2215	if (!net)
2216		return ERR_PTR(-EINVAL);
2217
2218	return net;
2219}
2220
2221static struct net *rtnl_link_get_net_capable(const struct sk_buff *skb,
2222					     struct net *src_net,
2223					     struct nlattr *tb[], int cap)
2224{
2225	struct net *net;
2226
2227	net = rtnl_link_get_net_by_nlattr(src_net, tb);
2228	if (IS_ERR(net))
2229		return net;
2230
2231	if (!netlink_ns_capable(skb, net->user_ns, cap)) {
2232		put_net(net);
2233		return ERR_PTR(-EPERM);
2234	}
2235
2236	return net;
2237}
2238
2239/* Verify that rtnetlink requests do not pass additional properties
2240 * potentially referring to different network namespaces.
2241 */
2242static int rtnl_ensure_unique_netns(struct nlattr *tb[],
2243				    struct netlink_ext_ack *extack,
2244				    bool netns_id_only)
2245{
2246
2247	if (netns_id_only) {
2248		if (!tb[IFLA_NET_NS_PID] && !tb[IFLA_NET_NS_FD])
2249			return 0;
2250
2251		NL_SET_ERR_MSG(extack, "specified netns attribute not supported");
2252		return -EOPNOTSUPP;
2253	}
2254
2255	if (tb[IFLA_TARGET_NETNSID] && (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]))
2256		goto invalid_attr;
2257
2258	if (tb[IFLA_NET_NS_PID] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_FD]))
2259		goto invalid_attr;
2260
2261	if (tb[IFLA_NET_NS_FD] && (tb[IFLA_TARGET_NETNSID] || tb[IFLA_NET_NS_PID]))
2262		goto invalid_attr;
2263
2264	return 0;
2265
2266invalid_attr:
2267	NL_SET_ERR_MSG(extack, "multiple netns identifying attributes specified");
2268	return -EINVAL;
2269}
2270
2271static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
 
2272{
2273	if (dev) {
2274		if (tb[IFLA_ADDRESS] &&
2275		    nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
2276			return -EINVAL;
2277
2278		if (tb[IFLA_BROADCAST] &&
2279		    nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
2280			return -EINVAL;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2281	}
2282
2283	if (tb[IFLA_AF_SPEC]) {
2284		struct nlattr *af;
2285		int rem, err;
2286
2287		nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2288			const struct rtnl_af_ops *af_ops;
 
2289
2290			af_ops = rtnl_af_lookup(nla_type(af));
2291			if (!af_ops)
2292				return -EAFNOSUPPORT;
2293
2294			if (!af_ops->set_link_af)
2295				return -EOPNOTSUPP;
 
 
 
 
2296
2297			if (af_ops->validate_link_af) {
2298				err = af_ops->validate_link_af(dev, af);
2299				if (err < 0)
2300					return err;
2301			}
2302		}
2303	}
2304
2305	return 0;
2306}
2307
2308static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
2309				  int guid_type)
2310{
2311	const struct net_device_ops *ops = dev->netdev_ops;
2312
2313	return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
2314}
2315
2316static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
2317{
2318	if (dev->type != ARPHRD_INFINIBAND)
2319		return -EOPNOTSUPP;
2320
2321	return handle_infiniband_guid(dev, ivt, guid_type);
2322}
2323
2324static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
2325{
2326	const struct net_device_ops *ops = dev->netdev_ops;
2327	int err = -EINVAL;
2328
2329	if (tb[IFLA_VF_MAC]) {
2330		struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
2331
2332		if (ivm->vf >= INT_MAX)
2333			return -EINVAL;
2334		err = -EOPNOTSUPP;
2335		if (ops->ndo_set_vf_mac)
2336			err = ops->ndo_set_vf_mac(dev, ivm->vf,
2337						  ivm->mac);
2338		if (err < 0)
2339			return err;
2340	}
2341
2342	if (tb[IFLA_VF_VLAN]) {
2343		struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
2344
2345		if (ivv->vf >= INT_MAX)
2346			return -EINVAL;
2347		err = -EOPNOTSUPP;
2348		if (ops->ndo_set_vf_vlan)
2349			err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
2350						   ivv->qos,
2351						   htons(ETH_P_8021Q));
2352		if (err < 0)
2353			return err;
2354	}
2355
2356	if (tb[IFLA_VF_VLAN_LIST]) {
2357		struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN];
2358		struct nlattr *attr;
2359		int rem, len = 0;
2360
2361		err = -EOPNOTSUPP;
2362		if (!ops->ndo_set_vf_vlan)
2363			return err;
2364
2365		nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) {
2366			if (nla_type(attr) != IFLA_VF_VLAN_INFO ||
2367			    nla_len(attr) < NLA_HDRLEN) {
2368				return -EINVAL;
2369			}
2370			if (len >= MAX_VLAN_LIST_LEN)
2371				return -EOPNOTSUPP;
2372			ivvl[len] = nla_data(attr);
2373
2374			len++;
2375		}
2376		if (len == 0)
2377			return -EINVAL;
2378
2379		if (ivvl[0]->vf >= INT_MAX)
2380			return -EINVAL;
2381		err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan,
2382					   ivvl[0]->qos, ivvl[0]->vlan_proto);
2383		if (err < 0)
2384			return err;
2385	}
2386
2387	if (tb[IFLA_VF_TX_RATE]) {
2388		struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
2389		struct ifla_vf_info ivf;
2390
2391		if (ivt->vf >= INT_MAX)
2392			return -EINVAL;
2393		err = -EOPNOTSUPP;
2394		if (ops->ndo_get_vf_config)
2395			err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
2396		if (err < 0)
2397			return err;
2398
2399		err = -EOPNOTSUPP;
2400		if (ops->ndo_set_vf_rate)
2401			err = ops->ndo_set_vf_rate(dev, ivt->vf,
2402						   ivf.min_tx_rate,
2403						   ivt->rate);
2404		if (err < 0)
2405			return err;
2406	}
2407
2408	if (tb[IFLA_VF_RATE]) {
2409		struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
2410
2411		if (ivt->vf >= INT_MAX)
2412			return -EINVAL;
2413		err = -EOPNOTSUPP;
2414		if (ops->ndo_set_vf_rate)
2415			err = ops->ndo_set_vf_rate(dev, ivt->vf,
2416						   ivt->min_tx_rate,
2417						   ivt->max_tx_rate);
2418		if (err < 0)
2419			return err;
2420	}
2421
2422	if (tb[IFLA_VF_SPOOFCHK]) {
2423		struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
2424
2425		if (ivs->vf >= INT_MAX)
2426			return -EINVAL;
2427		err = -EOPNOTSUPP;
2428		if (ops->ndo_set_vf_spoofchk)
2429			err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
2430						       ivs->setting);
2431		if (err < 0)
2432			return err;
2433	}
2434
2435	if (tb[IFLA_VF_LINK_STATE]) {
2436		struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
2437
2438		if (ivl->vf >= INT_MAX)
2439			return -EINVAL;
2440		err = -EOPNOTSUPP;
2441		if (ops->ndo_set_vf_link_state)
2442			err = ops->ndo_set_vf_link_state(dev, ivl->vf,
2443							 ivl->link_state);
2444		if (err < 0)
2445			return err;
2446	}
2447
2448	if (tb[IFLA_VF_RSS_QUERY_EN]) {
2449		struct ifla_vf_rss_query_en *ivrssq_en;
2450
2451		err = -EOPNOTSUPP;
2452		ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
2453		if (ivrssq_en->vf >= INT_MAX)
2454			return -EINVAL;
2455		if (ops->ndo_set_vf_rss_query_en)
2456			err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
2457							   ivrssq_en->setting);
2458		if (err < 0)
2459			return err;
2460	}
2461
2462	if (tb[IFLA_VF_TRUST]) {
2463		struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
2464
2465		if (ivt->vf >= INT_MAX)
2466			return -EINVAL;
2467		err = -EOPNOTSUPP;
2468		if (ops->ndo_set_vf_trust)
2469			err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
2470		if (err < 0)
2471			return err;
2472	}
2473
2474	if (tb[IFLA_VF_IB_NODE_GUID]) {
2475		struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
2476
2477		if (ivt->vf >= INT_MAX)
2478			return -EINVAL;
2479		if (!ops->ndo_set_vf_guid)
2480			return -EOPNOTSUPP;
2481		return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
2482	}
2483
2484	if (tb[IFLA_VF_IB_PORT_GUID]) {
2485		struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
2486
2487		if (ivt->vf >= INT_MAX)
2488			return -EINVAL;
2489		if (!ops->ndo_set_vf_guid)
2490			return -EOPNOTSUPP;
2491
2492		return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
2493	}
2494
2495	return err;
2496}
2497
2498static int do_set_master(struct net_device *dev, int ifindex,
2499			 struct netlink_ext_ack *extack)
2500{
2501	struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
2502	const struct net_device_ops *ops;
2503	int err;
2504
2505	if (upper_dev) {
2506		if (upper_dev->ifindex == ifindex)
2507			return 0;
2508		ops = upper_dev->netdev_ops;
2509		if (ops->ndo_del_slave) {
2510			err = ops->ndo_del_slave(upper_dev, dev);
2511			if (err)
2512				return err;
2513		} else {
2514			return -EOPNOTSUPP;
2515		}
2516	}
2517
2518	if (ifindex) {
2519		upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
2520		if (!upper_dev)
2521			return -EINVAL;
2522		ops = upper_dev->netdev_ops;
2523		if (ops->ndo_add_slave) {
2524			err = ops->ndo_add_slave(upper_dev, dev, extack);
2525			if (err)
2526				return err;
2527		} else {
2528			return -EOPNOTSUPP;
2529		}
2530	}
2531	return 0;
2532}
2533
2534static const struct nla_policy ifla_proto_down_reason_policy[IFLA_PROTO_DOWN_REASON_VALUE + 1] = {
2535	[IFLA_PROTO_DOWN_REASON_MASK]	= { .type = NLA_U32 },
2536	[IFLA_PROTO_DOWN_REASON_VALUE]	= { .type = NLA_U32 },
2537};
2538
2539static int do_set_proto_down(struct net_device *dev,
2540			     struct nlattr *nl_proto_down,
2541			     struct nlattr *nl_proto_down_reason,
2542			     struct netlink_ext_ack *extack)
2543{
2544	struct nlattr *pdreason[IFLA_PROTO_DOWN_REASON_MAX + 1];
2545	const struct net_device_ops *ops = dev->netdev_ops;
2546	unsigned long mask = 0;
2547	u32 value;
2548	bool proto_down;
2549	int err;
2550
2551	if (!ops->ndo_change_proto_down) {
2552		NL_SET_ERR_MSG(extack,  "Protodown not supported by device");
2553		return -EOPNOTSUPP;
2554	}
2555
2556	if (nl_proto_down_reason) {
2557		err = nla_parse_nested_deprecated(pdreason,
2558						  IFLA_PROTO_DOWN_REASON_MAX,
2559						  nl_proto_down_reason,
2560						  ifla_proto_down_reason_policy,
2561						  NULL);
2562		if (err < 0)
2563			return err;
2564
2565		if (!pdreason[IFLA_PROTO_DOWN_REASON_VALUE]) {
2566			NL_SET_ERR_MSG(extack, "Invalid protodown reason value");
2567			return -EINVAL;
2568		}
2569
2570		value = nla_get_u32(pdreason[IFLA_PROTO_DOWN_REASON_VALUE]);
2571
2572		if (pdreason[IFLA_PROTO_DOWN_REASON_MASK])
2573			mask = nla_get_u32(pdreason[IFLA_PROTO_DOWN_REASON_MASK]);
2574
2575		dev_change_proto_down_reason(dev, mask, value);
2576	}
2577
2578	if (nl_proto_down) {
2579		proto_down = nla_get_u8(nl_proto_down);
2580
2581		/* Don't turn off protodown if there are active reasons */
2582		if (!proto_down && dev->proto_down_reason) {
2583			NL_SET_ERR_MSG(extack, "Cannot clear protodown, active reasons");
2584			return -EBUSY;
2585		}
2586		err = dev_change_proto_down(dev,
2587					    proto_down);
2588		if (err)
2589			return err;
2590	}
2591
2592	return 0;
2593}
2594
2595#define DO_SETLINK_MODIFIED	0x01
2596/* notify flag means notify + modified. */
2597#define DO_SETLINK_NOTIFY	0x03
2598static int do_setlink(const struct sk_buff *skb,
2599		      struct net_device *dev, struct ifinfomsg *ifm,
2600		      struct netlink_ext_ack *extack,
2601		      struct nlattr **tb, char *ifname, int status)
2602{
2603	const struct net_device_ops *ops = dev->netdev_ops;
 
2604	int err;
2605
2606	err = validate_linkmsg(dev, tb);
2607	if (err < 0)
2608		return err;
2609
2610	if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD] || tb[IFLA_TARGET_NETNSID]) {
2611		const char *pat = ifname && ifname[0] ? ifname : NULL;
2612		struct net *net;
2613		int new_ifindex;
2614
2615		net = rtnl_link_get_net_capable(skb, dev_net(dev),
2616						tb, CAP_NET_ADMIN);
2617		if (IS_ERR(net)) {
2618			err = PTR_ERR(net);
2619			goto errout;
2620		}
2621
2622		if (tb[IFLA_NEW_IFINDEX])
2623			new_ifindex = nla_get_s32(tb[IFLA_NEW_IFINDEX]);
2624		else
2625			new_ifindex = 0;
2626
2627		err = __dev_change_net_namespace(dev, net, pat, new_ifindex);
2628		put_net(net);
2629		if (err)
2630			goto errout;
 
2631		status |= DO_SETLINK_MODIFIED;
2632	}
2633
2634	if (tb[IFLA_MAP]) {
2635		struct rtnl_link_ifmap *u_map;
2636		struct ifmap k_map;
2637
2638		if (!ops->ndo_set_config) {
2639			err = -EOPNOTSUPP;
2640			goto errout;
2641		}
2642
2643		if (!netif_device_present(dev)) {
2644			err = -ENODEV;
2645			goto errout;
2646		}
2647
2648		u_map = nla_data(tb[IFLA_MAP]);
2649		k_map.mem_start = (unsigned long) u_map->mem_start;
2650		k_map.mem_end = (unsigned long) u_map->mem_end;
2651		k_map.base_addr = (unsigned short) u_map->base_addr;
2652		k_map.irq = (unsigned char) u_map->irq;
2653		k_map.dma = (unsigned char) u_map->dma;
2654		k_map.port = (unsigned char) u_map->port;
2655
2656		err = ops->ndo_set_config(dev, &k_map);
2657		if (err < 0)
2658			goto errout;
2659
2660		status |= DO_SETLINK_NOTIFY;
2661	}
2662
2663	if (tb[IFLA_ADDRESS]) {
2664		struct sockaddr *sa;
2665		int len;
2666
2667		len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len,
2668						  sizeof(*sa));
2669		sa = kmalloc(len, GFP_KERNEL);
2670		if (!sa) {
2671			err = -ENOMEM;
2672			goto errout;
2673		}
2674		sa->sa_family = dev->type;
2675		memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
2676		       dev->addr_len);
2677		err = dev_set_mac_address_user(dev, sa, extack);
2678		kfree(sa);
2679		if (err)
2680			goto errout;
2681		status |= DO_SETLINK_MODIFIED;
2682	}
2683
2684	if (tb[IFLA_MTU]) {
2685		err = dev_set_mtu_ext(dev, nla_get_u32(tb[IFLA_MTU]), extack);
2686		if (err < 0)
2687			goto errout;
2688		status |= DO_SETLINK_MODIFIED;
2689	}
2690
2691	if (tb[IFLA_GROUP]) {
2692		dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2693		status |= DO_SETLINK_NOTIFY;
2694	}
2695
2696	/*
2697	 * Interface selected by interface index but interface
2698	 * name provided implies that a name change has been
2699	 * requested.
2700	 */
2701	if (ifm->ifi_index > 0 && ifname[0]) {
2702		err = dev_change_name(dev, ifname);
2703		if (err < 0)
2704			goto errout;
2705		status |= DO_SETLINK_MODIFIED;
2706	}
2707
2708	if (tb[IFLA_IFALIAS]) {
2709		err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
2710				    nla_len(tb[IFLA_IFALIAS]));
2711		if (err < 0)
2712			goto errout;
2713		status |= DO_SETLINK_NOTIFY;
2714	}
2715
2716	if (tb[IFLA_BROADCAST]) {
2717		nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
2718		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
2719	}
2720
2721	if (ifm->ifi_flags || ifm->ifi_change) {
2722		err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
2723				       extack);
2724		if (err < 0)
2725			goto errout;
2726	}
2727
2728	if (tb[IFLA_MASTER]) {
2729		err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
2730		if (err)
2731			goto errout;
2732		status |= DO_SETLINK_MODIFIED;
2733	}
2734
2735	if (tb[IFLA_CARRIER]) {
2736		err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
2737		if (err)
2738			goto errout;
2739		status |= DO_SETLINK_MODIFIED;
2740	}
2741
2742	if (tb[IFLA_TXQLEN]) {
2743		unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]);
2744
2745		err = dev_change_tx_queue_len(dev, value);
2746		if (err)
2747			goto errout;
2748		status |= DO_SETLINK_MODIFIED;
2749	}
2750
2751	if (tb[IFLA_GSO_MAX_SIZE]) {
2752		u32 max_size = nla_get_u32(tb[IFLA_GSO_MAX_SIZE]);
2753
2754		if (max_size > GSO_MAX_SIZE) {
2755			err = -EINVAL;
2756			goto errout;
2757		}
2758
2759		if (dev->gso_max_size ^ max_size) {
2760			netif_set_gso_max_size(dev, max_size);
2761			status |= DO_SETLINK_MODIFIED;
2762		}
2763	}
2764
2765	if (tb[IFLA_GSO_MAX_SEGS]) {
2766		u32 max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
2767
2768		if (max_segs > GSO_MAX_SEGS) {
2769			err = -EINVAL;
2770			goto errout;
2771		}
 
2772
2773		if (dev->gso_max_segs ^ max_segs) {
2774			dev->gso_max_segs = max_segs;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2775			status |= DO_SETLINK_MODIFIED;
2776		}
2777	}
2778
2779	if (tb[IFLA_OPERSTATE])
2780		set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2781
2782	if (tb[IFLA_LINKMODE]) {
2783		unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
2784
2785		write_lock_bh(&dev_base_lock);
2786		if (dev->link_mode ^ value)
2787			status |= DO_SETLINK_NOTIFY;
2788		dev->link_mode = value;
2789		write_unlock_bh(&dev_base_lock);
2790	}
2791
2792	if (tb[IFLA_VFINFO_LIST]) {
2793		struct nlattr *vfinfo[IFLA_VF_MAX + 1];
2794		struct nlattr *attr;
2795		int rem;
2796
2797		nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
2798			if (nla_type(attr) != IFLA_VF_INFO ||
2799			    nla_len(attr) < NLA_HDRLEN) {
2800				err = -EINVAL;
2801				goto errout;
2802			}
2803			err = nla_parse_nested_deprecated(vfinfo, IFLA_VF_MAX,
2804							  attr,
2805							  ifla_vf_policy,
2806							  NULL);
2807			if (err < 0)
2808				goto errout;
2809			err = do_setvfinfo(dev, vfinfo);
2810			if (err < 0)
2811				goto errout;
2812			status |= DO_SETLINK_NOTIFY;
2813		}
2814	}
2815	err = 0;
2816
2817	if (tb[IFLA_VF_PORTS]) {
2818		struct nlattr *port[IFLA_PORT_MAX+1];
2819		struct nlattr *attr;
2820		int vf;
2821		int rem;
2822
2823		err = -EOPNOTSUPP;
2824		if (!ops->ndo_set_vf_port)
2825			goto errout;
2826
2827		nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
2828			if (nla_type(attr) != IFLA_VF_PORT ||
2829			    nla_len(attr) < NLA_HDRLEN) {
2830				err = -EINVAL;
2831				goto errout;
2832			}
2833			err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
2834							  attr,
2835							  ifla_port_policy,
2836							  NULL);
2837			if (err < 0)
2838				goto errout;
2839			if (!port[IFLA_PORT_VF]) {
2840				err = -EOPNOTSUPP;
2841				goto errout;
2842			}
2843			vf = nla_get_u32(port[IFLA_PORT_VF]);
2844			err = ops->ndo_set_vf_port(dev, vf, port);
2845			if (err < 0)
2846				goto errout;
2847			status |= DO_SETLINK_NOTIFY;
2848		}
2849	}
2850	err = 0;
2851
2852	if (tb[IFLA_PORT_SELF]) {
2853		struct nlattr *port[IFLA_PORT_MAX+1];
2854
2855		err = nla_parse_nested_deprecated(port, IFLA_PORT_MAX,
2856						  tb[IFLA_PORT_SELF],
2857						  ifla_port_policy, NULL);
2858		if (err < 0)
2859			goto errout;
2860
2861		err = -EOPNOTSUPP;
2862		if (ops->ndo_set_vf_port)
2863			err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
2864		if (err < 0)
2865			goto errout;
2866		status |= DO_SETLINK_NOTIFY;
2867	}
2868
2869	if (tb[IFLA_AF_SPEC]) {
2870		struct nlattr *af;
2871		int rem;
2872
2873		nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2874			const struct rtnl_af_ops *af_ops;
 
2875
2876			BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af))));
 
 
 
 
2877
2878			err = af_ops->set_link_af(dev, af, extack);
 
 
2879			if (err < 0)
2880				goto errout;
2881
2882			status |= DO_SETLINK_NOTIFY;
2883		}
2884	}
2885	err = 0;
2886
2887	if (tb[IFLA_PROTO_DOWN] || tb[IFLA_PROTO_DOWN_REASON]) {
2888		err = do_set_proto_down(dev, tb[IFLA_PROTO_DOWN],
2889					tb[IFLA_PROTO_DOWN_REASON], extack);
2890		if (err)
2891			goto errout;
2892		status |= DO_SETLINK_NOTIFY;
2893	}
2894
2895	if (tb[IFLA_XDP]) {
2896		struct nlattr *xdp[IFLA_XDP_MAX + 1];
2897		u32 xdp_flags = 0;
2898
2899		err = nla_parse_nested_deprecated(xdp, IFLA_XDP_MAX,
2900						  tb[IFLA_XDP],
2901						  ifla_xdp_policy, NULL);
2902		if (err < 0)
2903			goto errout;
2904
2905		if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) {
2906			err = -EINVAL;
2907			goto errout;
2908		}
2909
2910		if (xdp[IFLA_XDP_FLAGS]) {
2911			xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]);
2912			if (xdp_flags & ~XDP_FLAGS_MASK) {
2913				err = -EINVAL;
2914				goto errout;
2915			}
2916			if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) {
2917				err = -EINVAL;
2918				goto errout;
2919			}
2920		}
2921
2922		if (xdp[IFLA_XDP_FD]) {
2923			int expected_fd = -1;
2924
2925			if (xdp_flags & XDP_FLAGS_REPLACE) {
2926				if (!xdp[IFLA_XDP_EXPECTED_FD]) {
2927					err = -EINVAL;
2928					goto errout;
2929				}
2930				expected_fd =
2931					nla_get_s32(xdp[IFLA_XDP_EXPECTED_FD]);
2932			}
2933
2934			err = dev_change_xdp_fd(dev, extack,
2935						nla_get_s32(xdp[IFLA_XDP_FD]),
2936						expected_fd,
2937						xdp_flags);
2938			if (err)
2939				goto errout;
2940			status |= DO_SETLINK_NOTIFY;
2941		}
2942	}
2943
2944errout:
2945	if (status & DO_SETLINK_MODIFIED) {
2946		if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY)
2947			netdev_state_change(dev);
2948
2949		if (err < 0)
2950			net_warn_ratelimited("A link change request failed with some changes committed already. Interface %s may have been left with an inconsistent configuration, please check.\n",
2951					     dev->name);
2952	}
2953
2954	return err;
2955}
2956
2957static struct net_device *rtnl_dev_get(struct net *net,
2958				       struct nlattr *ifname_attr,
2959				       struct nlattr *altifname_attr,
2960				       char *ifname)
2961{
2962	char buffer[ALTIFNAMSIZ];
2963
2964	if (!ifname) {
2965		ifname = buffer;
2966		if (ifname_attr)
2967			nla_strscpy(ifname, ifname_attr, IFNAMSIZ);
2968		else if (altifname_attr)
2969			nla_strscpy(ifname, altifname_attr, ALTIFNAMSIZ);
2970		else
2971			return NULL;
2972	}
2973
2974	return __dev_get_by_name(net, ifname);
2975}
2976
2977static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2978			struct netlink_ext_ack *extack)
2979{
 
2980	struct net *net = sock_net(skb->sk);
2981	struct ifinfomsg *ifm;
2982	struct net_device *dev;
2983	int err;
2984	struct nlattr *tb[IFLA_MAX+1];
2985	char ifname[IFNAMSIZ];
 
 
 
2986
2987	err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
2988				     ifla_policy, extack);
2989	if (err < 0)
2990		goto errout;
2991
2992	err = rtnl_ensure_unique_netns(tb, extack, false);
2993	if (err < 0)
2994		goto errout;
2995
2996	if (tb[IFLA_IFNAME])
2997		nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2998	else
2999		ifname[0] = '\0';
 
 
 
 
 
 
 
3000
3001	err = -EINVAL;
3002	ifm = nlmsg_data(nlh);
3003	if (ifm->ifi_index > 0)
3004		dev = __dev_get_by_index(net, ifm->ifi_index);
3005	else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3006		dev = rtnl_dev_get(net, NULL, tb[IFLA_ALT_IFNAME], ifname);
3007	else
3008		goto errout;
3009
3010	if (dev == NULL) {
 
 
3011		err = -ENODEV;
3012		goto errout;
3013	}
3014
3015	err = do_setlink(skb, dev, ifm, extack, tb, ifname, 0);
 
3016errout:
3017	return err;
3018}
3019
3020static int rtnl_group_dellink(const struct net *net, int group)
3021{
3022	struct net_device *dev, *aux;
3023	LIST_HEAD(list_kill);
3024	bool found = false;
3025
3026	if (!group)
3027		return -EPERM;
3028
3029	for_each_netdev(net, dev) {
3030		if (dev->group == group) {
3031			const struct rtnl_link_ops *ops;
3032
3033			found = true;
3034			ops = dev->rtnl_link_ops;
3035			if (!ops || !ops->dellink)
3036				return -EOPNOTSUPP;
3037		}
3038	}
3039
3040	if (!found)
3041		return -ENODEV;
3042
3043	for_each_netdev_safe(net, dev, aux) {
3044		if (dev->group == group) {
3045			const struct rtnl_link_ops *ops;
3046
3047			ops = dev->rtnl_link_ops;
3048			ops->dellink(dev, &list_kill);
3049		}
3050	}
3051	unregister_netdevice_many(&list_kill);
3052
3053	return 0;
3054}
3055
3056int rtnl_delete_link(struct net_device *dev)
3057{
3058	const struct rtnl_link_ops *ops;
3059	LIST_HEAD(list_kill);
3060
3061	ops = dev->rtnl_link_ops;
3062	if (!ops || !ops->dellink)
3063		return -EOPNOTSUPP;
3064
3065	ops->dellink(dev, &list_kill);
3066	unregister_netdevice_many(&list_kill);
3067
3068	return 0;
3069}
3070EXPORT_SYMBOL_GPL(rtnl_delete_link);
3071
3072static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
3073			struct netlink_ext_ack *extack)
3074{
 
3075	struct net *net = sock_net(skb->sk);
3076	struct net *tgt_net = net;
3077	struct net_device *dev = NULL;
3078	struct ifinfomsg *ifm;
3079	struct nlattr *tb[IFLA_MAX+1];
3080	int err;
 
3081	int netnsid = -1;
 
3082
3083	err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3084				     ifla_policy, extack);
3085	if (err < 0)
3086		return err;
3087
3088	err = rtnl_ensure_unique_netns(tb, extack, true);
3089	if (err < 0)
3090		return err;
3091
3092	if (tb[IFLA_TARGET_NETNSID]) {
3093		netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
3094		tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
3095		if (IS_ERR(tgt_net))
3096			return PTR_ERR(tgt_net);
3097	}
3098
3099	err = -EINVAL;
3100	ifm = nlmsg_data(nlh);
3101	if (ifm->ifi_index > 0)
3102		dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
3103	else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3104		dev = rtnl_dev_get(net, tb[IFLA_IFNAME],
3105				   tb[IFLA_ALT_IFNAME], NULL);
 
 
 
 
3106	else if (tb[IFLA_GROUP])
3107		err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP]));
3108	else
3109		goto out;
3110
3111	if (!dev) {
3112		if (tb[IFLA_IFNAME] || ifm->ifi_index > 0)
3113			err = -ENODEV;
3114
3115		goto out;
3116	}
3117
3118	err = rtnl_delete_link(dev);
3119
3120out:
3121	if (netnsid >= 0)
3122		put_net(tgt_net);
3123
3124	return err;
3125}
3126
3127int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
 
3128{
3129	unsigned int old_flags;
3130	int err;
3131
3132	old_flags = dev->flags;
3133	if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
3134		err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm),
3135					 NULL);
3136		if (err < 0)
3137			return err;
3138	}
3139
3140	if (dev->rtnl_link_state == RTNL_LINK_INITIALIZED) {
3141		__dev_notify_flags(dev, old_flags, (old_flags ^ dev->flags));
3142	} else {
3143		dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
3144		__dev_notify_flags(dev, old_flags, ~0U);
3145	}
3146	return 0;
3147}
3148EXPORT_SYMBOL(rtnl_configure_link);
3149
3150struct net_device *rtnl_create_link(struct net *net, const char *ifname,
3151				    unsigned char name_assign_type,
3152				    const struct rtnl_link_ops *ops,
3153				    struct nlattr *tb[],
3154				    struct netlink_ext_ack *extack)
3155{
3156	struct net_device *dev;
3157	unsigned int num_tx_queues = 1;
3158	unsigned int num_rx_queues = 1;
 
3159
3160	if (tb[IFLA_NUM_TX_QUEUES])
3161		num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
3162	else if (ops->get_num_tx_queues)
3163		num_tx_queues = ops->get_num_tx_queues();
3164
3165	if (tb[IFLA_NUM_RX_QUEUES])
3166		num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
3167	else if (ops->get_num_rx_queues)
3168		num_rx_queues = ops->get_num_rx_queues();
3169
3170	if (num_tx_queues < 1 || num_tx_queues > 4096) {
3171		NL_SET_ERR_MSG(extack, "Invalid number of transmit queues");
3172		return ERR_PTR(-EINVAL);
3173	}
3174
3175	if (num_rx_queues < 1 || num_rx_queues > 4096) {
3176		NL_SET_ERR_MSG(extack, "Invalid number of receive queues");
3177		return ERR_PTR(-EINVAL);
3178	}
3179
3180	if (ops->alloc) {
3181		dev = ops->alloc(tb, ifname, name_assign_type,
3182				 num_tx_queues, num_rx_queues);
3183		if (IS_ERR(dev))
3184			return dev;
3185	} else {
3186		dev = alloc_netdev_mqs(ops->priv_size, ifname,
3187				       name_assign_type, ops->setup,
3188				       num_tx_queues, num_rx_queues);
3189	}
3190
3191	if (!dev)
3192		return ERR_PTR(-ENOMEM);
3193
 
 
 
 
 
 
3194	dev_net_set(dev, net);
3195	dev->rtnl_link_ops = ops;
3196	dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
3197
3198	if (tb[IFLA_MTU]) {
3199		u32 mtu = nla_get_u32(tb[IFLA_MTU]);
3200		int err;
3201
3202		err = dev_validate_mtu(dev, mtu, extack);
3203		if (err) {
3204			free_netdev(dev);
3205			return ERR_PTR(err);
3206		}
3207		dev->mtu = mtu;
3208	}
3209	if (tb[IFLA_ADDRESS]) {
3210		memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
3211				nla_len(tb[IFLA_ADDRESS]));
3212		dev->addr_assign_type = NET_ADDR_SET;
3213	}
3214	if (tb[IFLA_BROADCAST])
3215		memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
3216				nla_len(tb[IFLA_BROADCAST]));
3217	if (tb[IFLA_TXQLEN])
3218		dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
3219	if (tb[IFLA_OPERSTATE])
3220		set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
3221	if (tb[IFLA_LINKMODE])
3222		dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
3223	if (tb[IFLA_GROUP])
3224		dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
3225	if (tb[IFLA_GSO_MAX_SIZE])
3226		netif_set_gso_max_size(dev, nla_get_u32(tb[IFLA_GSO_MAX_SIZE]));
3227	if (tb[IFLA_GSO_MAX_SEGS])
3228		dev->gso_max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
 
 
 
 
 
 
3229
3230	return dev;
3231}
3232EXPORT_SYMBOL(rtnl_create_link);
3233
3234static int rtnl_group_changelink(const struct sk_buff *skb,
3235		struct net *net, int group,
3236		struct ifinfomsg *ifm,
3237		struct netlink_ext_ack *extack,
3238		struct nlattr **tb)
3239{
3240	struct net_device *dev, *aux;
3241	int err;
3242
3243	for_each_netdev_safe(net, dev, aux) {
3244		if (dev->group == group) {
3245			err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0);
3246			if (err < 0)
3247				return err;
3248		}
3249	}
3250
3251	return 0;
3252}
3253
3254static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3255			  struct nlattr **attr, struct netlink_ext_ack *extack)
3256{
3257	struct nlattr *slave_attr[RTNL_SLAVE_MAX_TYPE + 1];
3258	unsigned char name_assign_type = NET_NAME_USER;
3259	struct nlattr *linkinfo[IFLA_INFO_MAX + 1];
3260	const struct rtnl_link_ops *m_ops = NULL;
3261	struct net_device *master_dev = NULL;
3262	struct net *net = sock_net(skb->sk);
3263	const struct rtnl_link_ops *ops;
3264	struct nlattr *tb[IFLA_MAX + 1];
3265	struct net *dest_net, *link_net;
3266	struct nlattr **slave_data;
3267	char kind[MODULE_NAME_LEN];
3268	struct net_device *dev;
3269	struct ifinfomsg *ifm;
3270	char ifname[IFNAMSIZ];
3271	struct nlattr **data;
3272	int err;
3273
3274#ifdef CONFIG_MODULES
3275replay:
3276#endif
3277	err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3278				     ifla_policy, extack);
3279	if (err < 0)
3280		return err;
3281
3282	err = rtnl_ensure_unique_netns(tb, extack, false);
3283	if (err < 0)
3284		return err;
3285
3286	if (tb[IFLA_IFNAME])
3287		nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
3288	else
3289		ifname[0] = '\0';
 
 
 
 
 
 
 
3290
3291	ifm = nlmsg_data(nlh);
3292	if (ifm->ifi_index > 0)
3293		dev = __dev_get_by_index(net, ifm->ifi_index);
3294	else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3295		dev = rtnl_dev_get(net, NULL, tb[IFLA_ALT_IFNAME], ifname);
3296	else
3297		dev = NULL;
3298
3299	if (dev) {
3300		master_dev = netdev_master_upper_dev_get(dev);
3301		if (master_dev)
3302			m_ops = master_dev->rtnl_link_ops;
3303	}
3304
3305	err = validate_linkmsg(dev, tb);
3306	if (err < 0)
3307		return err;
3308
3309	if (tb[IFLA_LINKINFO]) {
3310		err = nla_parse_nested_deprecated(linkinfo, IFLA_INFO_MAX,
3311						  tb[IFLA_LINKINFO],
3312						  ifla_info_policy, NULL);
3313		if (err < 0)
3314			return err;
3315	} else
3316		memset(linkinfo, 0, sizeof(linkinfo));
3317
3318	if (linkinfo[IFLA_INFO_KIND]) {
3319		nla_strscpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
3320		ops = rtnl_link_ops_get(kind);
3321	} else {
3322		kind[0] = '\0';
3323		ops = NULL;
3324	}
3325
3326	data = NULL;
3327	if (ops) {
3328		if (ops->maxtype > RTNL_MAX_TYPE)
3329			return -EINVAL;
3330
3331		if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
3332			err = nla_parse_nested_deprecated(attr, ops->maxtype,
3333							  linkinfo[IFLA_INFO_DATA],
3334							  ops->policy, extack);
3335			if (err < 0)
3336				return err;
3337			data = attr;
3338		}
3339		if (ops->validate) {
3340			err = ops->validate(tb, data, extack);
3341			if (err < 0)
3342				return err;
3343		}
3344	}
3345
3346	slave_data = NULL;
3347	if (m_ops) {
3348		if (m_ops->slave_maxtype > RTNL_SLAVE_MAX_TYPE)
3349			return -EINVAL;
3350
3351		if (m_ops->slave_maxtype &&
3352		    linkinfo[IFLA_INFO_SLAVE_DATA]) {
3353			err = nla_parse_nested_deprecated(slave_attr,
3354							  m_ops->slave_maxtype,
3355							  linkinfo[IFLA_INFO_SLAVE_DATA],
3356							  m_ops->slave_policy,
3357							  extack);
3358			if (err < 0)
3359				return err;
3360			slave_data = slave_attr;
3361		}
3362	}
3363
3364	if (dev) {
3365		int status = 0;
3366
3367		if (nlh->nlmsg_flags & NLM_F_EXCL)
3368			return -EEXIST;
3369		if (nlh->nlmsg_flags & NLM_F_REPLACE)
3370			return -EOPNOTSUPP;
3371
3372		if (linkinfo[IFLA_INFO_DATA]) {
3373			if (!ops || ops != dev->rtnl_link_ops ||
3374			    !ops->changelink)
3375				return -EOPNOTSUPP;
3376
3377			err = ops->changelink(dev, tb, data, extack);
3378			if (err < 0)
3379				return err;
3380			status |= DO_SETLINK_NOTIFY;
3381		}
3382
3383		if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
3384			if (!m_ops || !m_ops->slave_changelink)
3385				return -EOPNOTSUPP;
 
 
 
 
 
3386
3387			err = m_ops->slave_changelink(master_dev, dev, tb,
3388						      slave_data, extack);
 
3389			if (err < 0)
3390				return err;
3391			status |= DO_SETLINK_NOTIFY;
3392		}
3393
3394		return do_setlink(skb, dev, ifm, extack, tb, ifname, status);
3395	}
3396
3397	if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
3398		if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
3399			return rtnl_group_changelink(skb, net,
3400						nla_get_u32(tb[IFLA_GROUP]),
3401						ifm, extack, tb);
3402		return -ENODEV;
3403	}
3404
3405	if (tb[IFLA_MAP] || tb[IFLA_PROTINFO])
3406		return -EOPNOTSUPP;
3407
3408	if (!ops) {
3409#ifdef CONFIG_MODULES
3410		if (kind[0]) {
3411			__rtnl_unlock();
3412			request_module("rtnl-link-%s", kind);
3413			rtnl_lock();
3414			ops = rtnl_link_ops_get(kind);
3415			if (ops)
3416				goto replay;
3417		}
3418#endif
3419		NL_SET_ERR_MSG(extack, "Unknown device type");
3420		return -EOPNOTSUPP;
3421	}
3422
3423	if (!ops->alloc && !ops->setup)
3424		return -EOPNOTSUPP;
3425
3426	if (!ifname[0]) {
 
 
3427		snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
3428		name_assign_type = NET_NAME_ENUM;
3429	}
3430
3431	dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN);
3432	if (IS_ERR(dest_net))
3433		return PTR_ERR(dest_net);
3434
3435	if (tb[IFLA_LINK_NETNSID]) {
3436		int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
3437
3438		link_net = get_net_ns_by_id(dest_net, id);
3439		if (!link_net) {
3440			NL_SET_ERR_MSG(extack, "Unknown network namespace id");
3441			err =  -EINVAL;
3442			goto out;
3443		}
3444		err = -EPERM;
3445		if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
3446			goto out;
3447	} else {
3448		link_net = NULL;
3449	}
3450
3451	dev = rtnl_create_link(link_net ? : dest_net, ifname,
3452			       name_assign_type, ops, tb, extack);
3453	if (IS_ERR(dev)) {
3454		err = PTR_ERR(dev);
3455		goto out;
3456	}
3457
3458	dev->ifindex = ifm->ifi_index;
3459
 
 
 
 
 
3460	if (ops->newlink)
3461		err = ops->newlink(link_net ? : net, dev, tb, data, extack);
3462	else
3463		err = register_netdevice(dev);
3464	if (err < 0) {
3465		free_netdev(dev);
3466		goto out;
3467	}
3468
3469	err = rtnl_configure_link(dev, ifm);
3470	if (err < 0)
3471		goto out_unregister;
3472	if (link_net) {
3473		err = dev_change_net_namespace(dev, dest_net, ifname);
3474		if (err < 0)
3475			goto out_unregister;
3476	}
3477	if (tb[IFLA_MASTER]) {
3478		err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
3479		if (err)
3480			goto out_unregister;
3481	}
3482out:
3483	if (link_net)
3484		put_net(link_net);
3485	put_net(dest_net);
3486	return err;
3487out_unregister:
3488	if (ops->newlink) {
3489		LIST_HEAD(list_kill);
3490
3491		ops->dellink(dev, &list_kill);
3492		unregister_netdevice_many(&list_kill);
3493	} else {
3494		unregister_netdevice(dev);
3495	}
3496	goto out;
3497}
3498
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3499static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3500			struct netlink_ext_ack *extack)
3501{
3502	struct nlattr **attr;
 
 
 
 
 
3503	int ret;
3504
3505	attr = kmalloc_array(RTNL_MAX_TYPE + 1, sizeof(*attr), GFP_KERNEL);
3506	if (!attr)
3507		return -ENOMEM;
3508
3509	ret = __rtnl_newlink(skb, nlh, attr, extack);
3510	kfree(attr);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3511	return ret;
3512}
3513
3514static int rtnl_valid_getlink_req(struct sk_buff *skb,
3515				  const struct nlmsghdr *nlh,
3516				  struct nlattr **tb,
3517				  struct netlink_ext_ack *extack)
3518{
3519	struct ifinfomsg *ifm;
3520	int i, err;
3521
3522	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
3523		NL_SET_ERR_MSG(extack, "Invalid header for get link");
3524		return -EINVAL;
3525	}
3526
3527	if (!netlink_strict_get_check(skb))
3528		return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
3529					      ifla_policy, extack);
3530
3531	ifm = nlmsg_data(nlh);
3532	if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
3533	    ifm->ifi_change) {
3534		NL_SET_ERR_MSG(extack, "Invalid values in header for get link request");
3535		return -EINVAL;
3536	}
3537
3538	err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFLA_MAX,
3539					    ifla_policy, extack);
3540	if (err)
3541		return err;
3542
3543	for (i = 0; i <= IFLA_MAX; i++) {
3544		if (!tb[i])
3545			continue;
3546
3547		switch (i) {
3548		case IFLA_IFNAME:
3549		case IFLA_ALT_IFNAME:
3550		case IFLA_EXT_MASK:
3551		case IFLA_TARGET_NETNSID:
3552			break;
3553		default:
3554			NL_SET_ERR_MSG(extack, "Unsupported attribute in get link request");
3555			return -EINVAL;
3556		}
3557	}
3558
3559	return 0;
3560}
3561
3562static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3563			struct netlink_ext_ack *extack)
3564{
3565	struct net *net = sock_net(skb->sk);
3566	struct net *tgt_net = net;
3567	struct ifinfomsg *ifm;
3568	struct nlattr *tb[IFLA_MAX+1];
3569	struct net_device *dev = NULL;
3570	struct sk_buff *nskb;
3571	int netnsid = -1;
3572	int err;
3573	u32 ext_filter_mask = 0;
3574
3575	err = rtnl_valid_getlink_req(skb, nlh, tb, extack);
3576	if (err < 0)
3577		return err;
3578
3579	err = rtnl_ensure_unique_netns(tb, extack, true);
3580	if (err < 0)
3581		return err;
3582
3583	if (tb[IFLA_TARGET_NETNSID]) {
3584		netnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);
3585		tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);
3586		if (IS_ERR(tgt_net))
3587			return PTR_ERR(tgt_net);
3588	}
3589
3590	if (tb[IFLA_EXT_MASK])
3591		ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3592
3593	err = -EINVAL;
3594	ifm = nlmsg_data(nlh);
3595	if (ifm->ifi_index > 0)
3596		dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
3597	else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3598		dev = rtnl_dev_get(tgt_net, tb[IFLA_IFNAME],
3599				   tb[IFLA_ALT_IFNAME], NULL);
3600	else
3601		goto out;
3602
3603	err = -ENODEV;
3604	if (dev == NULL)
3605		goto out;
3606
3607	err = -ENOBUFS;
3608	nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
3609	if (nskb == NULL)
3610		goto out;
3611
 
 
 
 
 
 
 
 
3612	err = rtnl_fill_ifinfo(nskb, dev, net,
3613			       RTM_NEWLINK, NETLINK_CB(skb).portid,
3614			       nlh->nlmsg_seq, 0, 0, ext_filter_mask,
3615			       0, NULL, 0, netnsid, GFP_KERNEL);
3616	if (err < 0) {
3617		/* -EMSGSIZE implies BUG in if_nlmsg_size */
3618		WARN_ON(err == -EMSGSIZE);
3619		kfree_skb(nskb);
3620	} else
3621		err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
3622out:
3623	if (netnsid >= 0)
3624		put_net(tgt_net);
3625
3626	return err;
3627}
3628
3629static int rtnl_alt_ifname(int cmd, struct net_device *dev, struct nlattr *attr,
3630			   bool *changed, struct netlink_ext_ack *extack)
3631{
3632	char *alt_ifname;
 
3633	int err;
3634
3635	err = nla_validate(attr, attr->nla_len, IFLA_MAX, ifla_policy, extack);
3636	if (err)
3637		return err;
3638
3639	alt_ifname = nla_strdup(attr, GFP_KERNEL);
 
 
 
 
 
 
 
 
 
 
3640	if (!alt_ifname)
3641		return -ENOMEM;
3642
3643	if (cmd == RTM_NEWLINKPROP) {
3644		err = netdev_name_node_alt_create(dev, alt_ifname);
3645		if (!err)
3646			alt_ifname = NULL;
3647	} else if (cmd == RTM_DELLINKPROP) {
3648		err = netdev_name_node_alt_destroy(dev, alt_ifname);
3649	} else {
3650		WARN_ON_ONCE(1);
3651		err = -EINVAL;
3652	}
3653
3654	kfree(alt_ifname);
3655	if (!err)
3656		*changed = true;
3657	return err;
3658}
3659
3660static int rtnl_linkprop(int cmd, struct sk_buff *skb, struct nlmsghdr *nlh,
3661			 struct netlink_ext_ack *extack)
3662{
3663	struct net *net = sock_net(skb->sk);
3664	struct nlattr *tb[IFLA_MAX + 1];
3665	struct net_device *dev;
3666	struct ifinfomsg *ifm;
3667	bool changed = false;
3668	struct nlattr *attr;
3669	int err, rem;
3670
3671	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
3672	if (err)
3673		return err;
3674
3675	err = rtnl_ensure_unique_netns(tb, extack, true);
3676	if (err)
3677		return err;
3678
3679	ifm = nlmsg_data(nlh);
3680	if (ifm->ifi_index > 0)
3681		dev = __dev_get_by_index(net, ifm->ifi_index);
3682	else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
3683		dev = rtnl_dev_get(net, tb[IFLA_IFNAME],
3684				   tb[IFLA_ALT_IFNAME], NULL);
3685	else
3686		return -EINVAL;
3687
3688	if (!dev)
3689		return -ENODEV;
3690
3691	if (!tb[IFLA_PROP_LIST])
3692		return 0;
3693
3694	nla_for_each_nested(attr, tb[IFLA_PROP_LIST], rem) {
3695		switch (nla_type(attr)) {
3696		case IFLA_ALT_IFNAME:
3697			err = rtnl_alt_ifname(cmd, dev, attr, &changed, extack);
3698			if (err)
3699				return err;
3700			break;
3701		}
3702	}
3703
3704	if (changed)
3705		netdev_state_change(dev);
3706	return 0;
3707}
3708
3709static int rtnl_newlinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
3710			    struct netlink_ext_ack *extack)
3711{
3712	return rtnl_linkprop(RTM_NEWLINKPROP, skb, nlh, extack);
3713}
3714
3715static int rtnl_dellinkprop(struct sk_buff *skb, struct nlmsghdr *nlh,
3716			    struct netlink_ext_ack *extack)
3717{
3718	return rtnl_linkprop(RTM_DELLINKPROP, skb, nlh, extack);
3719}
3720
3721static u32 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
 
3722{
3723	struct net *net = sock_net(skb->sk);
3724	size_t min_ifinfo_dump_size = 0;
3725	struct nlattr *tb[IFLA_MAX+1];
3726	u32 ext_filter_mask = 0;
3727	struct net_device *dev;
3728	int hdrlen;
 
3729
3730	/* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
3731	hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
3732		 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
3733
3734	if (nlmsg_parse_deprecated(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) {
3735		if (tb[IFLA_EXT_MASK])
3736			ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
 
 
 
 
 
3737	}
3738
3739	if (!ext_filter_mask)
3740		return NLMSG_GOODSIZE;
3741	/*
3742	 * traverse the list of net devices and compute the minimum
3743	 * buffer size based upon the filter mask.
3744	 */
3745	rcu_read_lock();
3746	for_each_netdev_rcu(net, dev) {
3747		min_ifinfo_dump_size = max(min_ifinfo_dump_size,
3748					   if_nlmsg_size(dev, ext_filter_mask));
3749	}
3750	rcu_read_unlock();
3751
3752	return nlmsg_total_size(min_ifinfo_dump_size);
3753}
3754
3755static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
3756{
3757	int idx;
3758	int s_idx = cb->family;
3759	int type = cb->nlh->nlmsg_type - RTM_BASE;
3760	int ret = 0;
3761
3762	if (s_idx == 0)
3763		s_idx = 1;
3764
3765	for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
3766		struct rtnl_link __rcu **tab;
3767		struct rtnl_link *link;
3768		rtnl_dumpit_func dumpit;
3769
3770		if (idx < s_idx || idx == PF_PACKET)
3771			continue;
3772
3773		if (type < 0 || type >= RTM_NR_MSGTYPES)
3774			continue;
3775
3776		tab = rcu_dereference_rtnl(rtnl_msg_handlers[idx]);
3777		if (!tab)
3778			continue;
3779
3780		link = rcu_dereference_rtnl(tab[type]);
3781		if (!link)
3782			continue;
3783
3784		dumpit = link->dumpit;
3785		if (!dumpit)
3786			continue;
3787
3788		if (idx > s_idx) {
3789			memset(&cb->args[0], 0, sizeof(cb->args));
3790			cb->prev_seq = 0;
3791			cb->seq = 0;
3792		}
3793		ret = dumpit(skb, cb);
3794		if (ret)
3795			break;
3796	}
3797	cb->family = idx;
3798
3799	return skb->len ? : ret;
3800}
3801
3802struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
3803				       unsigned int change,
3804				       u32 event, gfp_t flags, int *new_nsid,
3805				       int new_ifindex)
 
3806{
3807	struct net *net = dev_net(dev);
3808	struct sk_buff *skb;
3809	int err = -ENOBUFS;
3810	size_t if_info_size;
3811
3812	skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
3813	if (skb == NULL)
3814		goto errout;
3815
 
 
 
 
 
3816	err = rtnl_fill_ifinfo(skb, dev, dev_net(dev),
3817			       type, 0, 0, change, 0, 0, event,
3818			       new_nsid, new_ifindex, -1, flags);
3819	if (err < 0) {
3820		/* -EMSGSIZE implies BUG in if_nlmsg_size() */
3821		WARN_ON(err == -EMSGSIZE);
3822		kfree_skb(skb);
3823		goto errout;
3824	}
3825	return skb;
3826errout:
3827	if (err < 0)
3828		rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3829	return NULL;
3830}
3831
3832void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
 
3833{
3834	struct net *net = dev_net(dev);
3835
3836	rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
3837}
3838
3839static void rtmsg_ifinfo_event(int type, struct net_device *dev,
3840			       unsigned int change, u32 event,
3841			       gfp_t flags, int *new_nsid, int new_ifindex)
 
3842{
3843	struct sk_buff *skb;
3844
3845	if (dev->reg_state != NETREG_REGISTERED)
3846		return;
3847
3848	skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid,
3849				     new_ifindex);
3850	if (skb)
3851		rtmsg_ifinfo_send(skb, dev, flags);
3852}
3853
3854void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
3855		  gfp_t flags)
3856{
3857	rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3858			   NULL, 0);
3859}
3860
3861void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
3862			 gfp_t flags, int *new_nsid, int new_ifindex)
3863{
3864	rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3865			   new_nsid, new_ifindex);
3866}
3867
3868static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
3869				   struct net_device *dev,
3870				   u8 *addr, u16 vid, u32 pid, u32 seq,
3871				   int type, unsigned int flags,
3872				   int nlflags, u16 ndm_state)
3873{
3874	struct nlmsghdr *nlh;
3875	struct ndmsg *ndm;
3876
3877	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
3878	if (!nlh)
3879		return -EMSGSIZE;
3880
3881	ndm = nlmsg_data(nlh);
3882	ndm->ndm_family  = AF_BRIDGE;
3883	ndm->ndm_pad1	 = 0;
3884	ndm->ndm_pad2    = 0;
3885	ndm->ndm_flags	 = flags;
3886	ndm->ndm_type	 = 0;
3887	ndm->ndm_ifindex = dev->ifindex;
3888	ndm->ndm_state   = ndm_state;
3889
3890	if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
3891		goto nla_put_failure;
3892	if (vid)
3893		if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
3894			goto nla_put_failure;
3895
3896	nlmsg_end(skb, nlh);
3897	return 0;
3898
3899nla_put_failure:
3900	nlmsg_cancel(skb, nlh);
3901	return -EMSGSIZE;
3902}
3903
3904static inline size_t rtnl_fdb_nlmsg_size(void)
3905{
3906	return NLMSG_ALIGN(sizeof(struct ndmsg)) +
3907	       nla_total_size(ETH_ALEN) +	/* NDA_LLADDR */
3908	       nla_total_size(sizeof(u16)) +	/* NDA_VLAN */
3909	       0;
3910}
3911
3912static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
3913			    u16 ndm_state)
3914{
3915	struct net *net = dev_net(dev);
3916	struct sk_buff *skb;
3917	int err = -ENOBUFS;
3918
3919	skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
3920	if (!skb)
3921		goto errout;
3922
3923	err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
3924				      0, 0, type, NTF_SELF, 0, ndm_state);
3925	if (err < 0) {
3926		kfree_skb(skb);
3927		goto errout;
3928	}
3929
3930	rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
3931	return;
3932errout:
3933	rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
3934}
3935
3936/*
3937 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
3938 */
3939int ndo_dflt_fdb_add(struct ndmsg *ndm,
3940		     struct nlattr *tb[],
3941		     struct net_device *dev,
3942		     const unsigned char *addr, u16 vid,
3943		     u16 flags)
3944{
3945	int err = -EINVAL;
3946
3947	/* If aging addresses are supported device will need to
3948	 * implement its own handler for this.
3949	 */
3950	if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
3951		netdev_info(dev, "default FDB implementation only supports local addresses\n");
3952		return err;
3953	}
3954
 
 
 
 
 
3955	if (vid) {
3956		netdev_info(dev, "vlans aren't supported yet for dev_uc|mc_add()\n");
3957		return err;
3958	}
3959
3960	if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3961		err = dev_uc_add_excl(dev, addr);
3962	else if (is_multicast_ether_addr(addr))
3963		err = dev_mc_add_excl(dev, addr);
3964
3965	/* Only return duplicate errors if NLM_F_EXCL is set */
3966	if (err == -EEXIST && !(flags & NLM_F_EXCL))
3967		err = 0;
3968
3969	return err;
3970}
3971EXPORT_SYMBOL(ndo_dflt_fdb_add);
3972
3973static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid,
3974			 struct netlink_ext_ack *extack)
3975{
3976	u16 vid = 0;
3977
3978	if (vlan_attr) {
3979		if (nla_len(vlan_attr) != sizeof(u16)) {
3980			NL_SET_ERR_MSG(extack, "invalid vlan attribute size");
3981			return -EINVAL;
3982		}
3983
3984		vid = nla_get_u16(vlan_attr);
3985
3986		if (!vid || vid >= VLAN_VID_MASK) {
3987			NL_SET_ERR_MSG(extack, "invalid vlan id");
3988			return -EINVAL;
3989		}
3990	}
3991	*p_vid = vid;
3992	return 0;
3993}
3994
3995static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
3996			struct netlink_ext_ack *extack)
3997{
3998	struct net *net = sock_net(skb->sk);
3999	struct ndmsg *ndm;
4000	struct nlattr *tb[NDA_MAX+1];
4001	struct net_device *dev;
4002	u8 *addr;
4003	u16 vid;
4004	int err;
4005
4006	err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
4007				     extack);
4008	if (err < 0)
4009		return err;
4010
4011	ndm = nlmsg_data(nlh);
4012	if (ndm->ndm_ifindex == 0) {
4013		NL_SET_ERR_MSG(extack, "invalid ifindex");
4014		return -EINVAL;
4015	}
4016
4017	dev = __dev_get_by_index(net, ndm->ndm_ifindex);
4018	if (dev == NULL) {
4019		NL_SET_ERR_MSG(extack, "unknown ifindex");
4020		return -ENODEV;
4021	}
4022
4023	if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
4024		NL_SET_ERR_MSG(extack, "invalid address");
4025		return -EINVAL;
4026	}
4027
4028	if (dev->type != ARPHRD_ETHER) {
4029		NL_SET_ERR_MSG(extack, "FDB add only supported for Ethernet devices");
4030		return -EINVAL;
4031	}
4032
4033	addr = nla_data(tb[NDA_LLADDR]);
4034
4035	err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
4036	if (err)
4037		return err;
4038
4039	err = -EOPNOTSUPP;
4040
4041	/* Support fdb on master device the net/bridge default case */
4042	if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
4043	    netif_is_bridge_port(dev)) {
4044		struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4045		const struct net_device_ops *ops = br_dev->netdev_ops;
 
4046
4047		err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
4048				       nlh->nlmsg_flags, extack);
4049		if (err)
4050			goto out;
4051		else
4052			ndm->ndm_flags &= ~NTF_MASTER;
4053	}
4054
4055	/* Embedded bridge, macvlan, and any other device support */
4056	if ((ndm->ndm_flags & NTF_SELF)) {
 
 
4057		if (dev->netdev_ops->ndo_fdb_add)
4058			err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
4059							   vid,
4060							   nlh->nlmsg_flags,
4061							   extack);
4062		else
4063			err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
4064					       nlh->nlmsg_flags);
4065
4066		if (!err) {
4067			rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
4068					ndm->ndm_state);
4069			ndm->ndm_flags &= ~NTF_SELF;
4070		}
4071	}
4072out:
4073	return err;
4074}
4075
4076/*
4077 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
4078 */
4079int ndo_dflt_fdb_del(struct ndmsg *ndm,
4080		     struct nlattr *tb[],
4081		     struct net_device *dev,
4082		     const unsigned char *addr, u16 vid)
4083{
4084	int err = -EINVAL;
4085
4086	/* If aging addresses are supported device will need to
4087	 * implement its own handler for this.
4088	 */
4089	if (!(ndm->ndm_state & NUD_PERMANENT)) {
4090		netdev_info(dev, "default FDB implementation only supports local addresses\n");
4091		return err;
4092	}
4093
4094	if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
4095		err = dev_uc_del(dev, addr);
4096	else if (is_multicast_ether_addr(addr))
4097		err = dev_mc_del(dev, addr);
4098
4099	return err;
4100}
4101EXPORT_SYMBOL(ndo_dflt_fdb_del);
4102
4103static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
4104			struct netlink_ext_ack *extack)
4105{
 
4106	struct net *net = sock_net(skb->sk);
 
4107	struct ndmsg *ndm;
4108	struct nlattr *tb[NDA_MAX+1];
4109	struct net_device *dev;
4110	__u8 *addr;
4111	int err;
4112	u16 vid;
4113
4114	if (!netlink_capable(skb, CAP_NET_ADMIN))
4115		return -EPERM;
4116
4117	err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, NULL,
4118				     extack);
 
 
 
 
 
 
 
4119	if (err < 0)
4120		return err;
4121
4122	ndm = nlmsg_data(nlh);
4123	if (ndm->ndm_ifindex == 0) {
4124		NL_SET_ERR_MSG(extack, "invalid ifindex");
4125		return -EINVAL;
4126	}
4127
4128	dev = __dev_get_by_index(net, ndm->ndm_ifindex);
4129	if (dev == NULL) {
4130		NL_SET_ERR_MSG(extack, "unknown ifindex");
4131		return -ENODEV;
4132	}
4133
4134	if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
4135		NL_SET_ERR_MSG(extack, "invalid address");
4136		return -EINVAL;
 
 
 
 
 
 
 
4137	}
4138
4139	if (dev->type != ARPHRD_ETHER) {
4140		NL_SET_ERR_MSG(extack, "FDB delete only supported for Ethernet devices");
4141		return -EINVAL;
4142	}
4143
4144	addr = nla_data(tb[NDA_LLADDR]);
4145
4146	err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
4147	if (err)
4148		return err;
4149
4150	err = -EOPNOTSUPP;
4151
4152	/* Support fdb on master device the net/bridge default case */
4153	if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
4154	    netif_is_bridge_port(dev)) {
4155		struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4156		const struct net_device_ops *ops = br_dev->netdev_ops;
4157
4158		if (ops->ndo_fdb_del)
4159			err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
 
 
 
 
 
 
 
4160
4161		if (err)
4162			goto out;
4163		else
4164			ndm->ndm_flags &= ~NTF_MASTER;
4165	}
4166
4167	/* Embedded bridge, macvlan, and any other device support */
4168	if (ndm->ndm_flags & NTF_SELF) {
4169		if (dev->netdev_ops->ndo_fdb_del)
4170			err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
4171							   vid);
4172		else
4173			err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
 
 
 
 
 
 
 
 
 
 
4174
4175		if (!err) {
4176			rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
4177					ndm->ndm_state);
 
4178			ndm->ndm_flags &= ~NTF_SELF;
4179		}
4180	}
4181out:
4182	return err;
4183}
4184
4185static int nlmsg_populate_fdb(struct sk_buff *skb,
4186			      struct netlink_callback *cb,
4187			      struct net_device *dev,
4188			      int *idx,
4189			      struct netdev_hw_addr_list *list)
4190{
4191	struct netdev_hw_addr *ha;
4192	int err;
4193	u32 portid, seq;
4194
4195	portid = NETLINK_CB(cb->skb).portid;
4196	seq = cb->nlh->nlmsg_seq;
4197
4198	list_for_each_entry(ha, &list->list, list) {
4199		if (*idx < cb->args[2])
4200			goto skip;
4201
4202		err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
4203					      portid, seq,
4204					      RTM_NEWNEIGH, NTF_SELF,
4205					      NLM_F_MULTI, NUD_PERMANENT);
4206		if (err < 0)
4207			return err;
4208skip:
4209		*idx += 1;
4210	}
4211	return 0;
4212}
4213
4214/**
4215 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
4216 * @skb: socket buffer to store message in
4217 * @cb: netlink callback
4218 * @dev: netdevice
4219 * @filter_dev: ignored
4220 * @idx: the number of FDB table entries dumped is added to *@idx
4221 *
4222 * Default netdevice operation to dump the existing unicast address list.
4223 * Returns number of addresses from list put in skb.
4224 */
4225int ndo_dflt_fdb_dump(struct sk_buff *skb,
4226		      struct netlink_callback *cb,
4227		      struct net_device *dev,
4228		      struct net_device *filter_dev,
4229		      int *idx)
4230{
4231	int err;
4232
4233	if (dev->type != ARPHRD_ETHER)
4234		return -EINVAL;
4235
4236	netif_addr_lock_bh(dev);
4237	err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
4238	if (err)
4239		goto out;
4240	err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
4241out:
4242	netif_addr_unlock_bh(dev);
4243	return err;
4244}
4245EXPORT_SYMBOL(ndo_dflt_fdb_dump);
4246
4247static int valid_fdb_dump_strict(const struct nlmsghdr *nlh,
4248				 int *br_idx, int *brport_idx,
4249				 struct netlink_ext_ack *extack)
4250{
4251	struct nlattr *tb[NDA_MAX + 1];
4252	struct ndmsg *ndm;
4253	int err, i;
4254
4255	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
4256		NL_SET_ERR_MSG(extack, "Invalid header for fdb dump request");
4257		return -EINVAL;
4258	}
4259
4260	ndm = nlmsg_data(nlh);
4261	if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
4262	    ndm->ndm_flags || ndm->ndm_type) {
4263		NL_SET_ERR_MSG(extack, "Invalid values in header for fdb dump request");
4264		return -EINVAL;
4265	}
4266
4267	err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
4268					    NDA_MAX, NULL, extack);
4269	if (err < 0)
4270		return err;
4271
4272	*brport_idx = ndm->ndm_ifindex;
4273	for (i = 0; i <= NDA_MAX; ++i) {
4274		if (!tb[i])
4275			continue;
4276
4277		switch (i) {
4278		case NDA_IFINDEX:
4279			if (nla_len(tb[i]) != sizeof(u32)) {
4280				NL_SET_ERR_MSG(extack, "Invalid IFINDEX attribute in fdb dump request");
4281				return -EINVAL;
4282			}
4283			*brport_idx = nla_get_u32(tb[NDA_IFINDEX]);
4284			break;
4285		case NDA_MASTER:
4286			if (nla_len(tb[i]) != sizeof(u32)) {
4287				NL_SET_ERR_MSG(extack, "Invalid MASTER attribute in fdb dump request");
4288				return -EINVAL;
4289			}
4290			*br_idx = nla_get_u32(tb[NDA_MASTER]);
4291			break;
4292		default:
4293			NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb dump request");
4294			return -EINVAL;
4295		}
4296	}
4297
4298	return 0;
4299}
4300
4301static int valid_fdb_dump_legacy(const struct nlmsghdr *nlh,
4302				 int *br_idx, int *brport_idx,
4303				 struct netlink_ext_ack *extack)
4304{
4305	struct nlattr *tb[IFLA_MAX+1];
4306	int err;
4307
4308	/* A hack to preserve kernel<->userspace interface.
4309	 * Before Linux v4.12 this code accepted ndmsg since iproute2 v3.3.0.
4310	 * However, ndmsg is shorter than ifinfomsg thus nlmsg_parse() bails.
4311	 * So, check for ndmsg with an optional u32 attribute (not used here).
4312	 * Fortunately these sizes don't conflict with the size of ifinfomsg
4313	 * with an optional attribute.
4314	 */
4315	if (nlmsg_len(nlh) != sizeof(struct ndmsg) &&
4316	    (nlmsg_len(nlh) != sizeof(struct ndmsg) +
4317	     nla_attr_size(sizeof(u32)))) {
4318		struct ifinfomsg *ifm;
4319
4320		err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
4321					     tb, IFLA_MAX, ifla_policy,
4322					     extack);
4323		if (err < 0) {
4324			return -EINVAL;
4325		} else if (err == 0) {
4326			if (tb[IFLA_MASTER])
4327				*br_idx = nla_get_u32(tb[IFLA_MASTER]);
4328		}
4329
4330		ifm = nlmsg_data(nlh);
4331		*brport_idx = ifm->ifi_index;
4332	}
4333	return 0;
4334}
4335
4336static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
4337{
4338	struct net_device *dev;
4339	struct net_device *br_dev = NULL;
4340	const struct net_device_ops *ops = NULL;
4341	const struct net_device_ops *cops = NULL;
4342	struct net *net = sock_net(skb->sk);
4343	struct hlist_head *head;
4344	int brport_idx = 0;
4345	int br_idx = 0;
4346	int h, s_h;
4347	int idx = 0, s_idx;
4348	int err = 0;
4349	int fidx = 0;
4350
4351	if (cb->strict_check)
4352		err = valid_fdb_dump_strict(cb->nlh, &br_idx, &brport_idx,
4353					    cb->extack);
4354	else
4355		err = valid_fdb_dump_legacy(cb->nlh, &br_idx, &brport_idx,
4356					    cb->extack);
4357	if (err < 0)
4358		return err;
4359
4360	if (br_idx) {
4361		br_dev = __dev_get_by_index(net, br_idx);
4362		if (!br_dev)
4363			return -ENODEV;
4364
4365		ops = br_dev->netdev_ops;
4366	}
4367
4368	s_h = cb->args[0];
4369	s_idx = cb->args[1];
4370
4371	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4372		idx = 0;
4373		head = &net->dev_index_head[h];
4374		hlist_for_each_entry(dev, head, index_hlist) {
4375
4376			if (brport_idx && (dev->ifindex != brport_idx))
4377				continue;
4378
4379			if (!br_idx) { /* user did not specify a specific bridge */
4380				if (netif_is_bridge_port(dev)) {
4381					br_dev = netdev_master_upper_dev_get(dev);
4382					cops = br_dev->netdev_ops;
4383				}
4384			} else {
4385				if (dev != br_dev &&
4386				    !netif_is_bridge_port(dev))
4387					continue;
4388
4389				if (br_dev != netdev_master_upper_dev_get(dev) &&
4390				    !(dev->priv_flags & IFF_EBRIDGE))
4391					continue;
4392				cops = ops;
4393			}
4394
4395			if (idx < s_idx)
4396				goto cont;
4397
4398			if (netif_is_bridge_port(dev)) {
4399				if (cops && cops->ndo_fdb_dump) {
4400					err = cops->ndo_fdb_dump(skb, cb,
4401								br_dev, dev,
4402								&fidx);
4403					if (err == -EMSGSIZE)
4404						goto out;
4405				}
4406			}
4407
4408			if (dev->netdev_ops->ndo_fdb_dump)
4409				err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
4410								    dev, NULL,
4411								    &fidx);
4412			else
4413				err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
4414							&fidx);
4415			if (err == -EMSGSIZE)
4416				goto out;
4417
4418			cops = NULL;
4419
4420			/* reset fdb offset to 0 for rest of the interfaces */
4421			cb->args[2] = 0;
4422			fidx = 0;
4423cont:
4424			idx++;
4425		}
4426	}
4427
4428out:
4429	cb->args[0] = h;
4430	cb->args[1] = idx;
4431	cb->args[2] = fidx;
4432
4433	return skb->len;
4434}
4435
4436static int valid_fdb_get_strict(const struct nlmsghdr *nlh,
4437				struct nlattr **tb, u8 *ndm_flags,
4438				int *br_idx, int *brport_idx, u8 **addr,
4439				u16 *vid, struct netlink_ext_ack *extack)
4440{
4441	struct ndmsg *ndm;
4442	int err, i;
4443
4444	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
4445		NL_SET_ERR_MSG(extack, "Invalid header for fdb get request");
4446		return -EINVAL;
4447	}
4448
4449	ndm = nlmsg_data(nlh);
4450	if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
4451	    ndm->ndm_type) {
4452		NL_SET_ERR_MSG(extack, "Invalid values in header for fdb get request");
4453		return -EINVAL;
4454	}
4455
4456	if (ndm->ndm_flags & ~(NTF_MASTER | NTF_SELF)) {
4457		NL_SET_ERR_MSG(extack, "Invalid flags in header for fdb get request");
4458		return -EINVAL;
4459	}
4460
4461	err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
4462					    NDA_MAX, nda_policy, extack);
4463	if (err < 0)
4464		return err;
4465
4466	*ndm_flags = ndm->ndm_flags;
4467	*brport_idx = ndm->ndm_ifindex;
4468	for (i = 0; i <= NDA_MAX; ++i) {
4469		if (!tb[i])
4470			continue;
4471
4472		switch (i) {
4473		case NDA_MASTER:
4474			*br_idx = nla_get_u32(tb[i]);
4475			break;
4476		case NDA_LLADDR:
4477			if (nla_len(tb[i]) != ETH_ALEN) {
4478				NL_SET_ERR_MSG(extack, "Invalid address in fdb get request");
4479				return -EINVAL;
4480			}
4481			*addr = nla_data(tb[i]);
4482			break;
4483		case NDA_VLAN:
4484			err = fdb_vid_parse(tb[i], vid, extack);
4485			if (err)
4486				return err;
4487			break;
4488		case NDA_VNI:
4489			break;
4490		default:
4491			NL_SET_ERR_MSG(extack, "Unsupported attribute in fdb get request");
4492			return -EINVAL;
4493		}
4494	}
4495
4496	return 0;
4497}
4498
4499static int rtnl_fdb_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4500			struct netlink_ext_ack *extack)
4501{
4502	struct net_device *dev = NULL, *br_dev = NULL;
4503	const struct net_device_ops *ops = NULL;
4504	struct net *net = sock_net(in_skb->sk);
4505	struct nlattr *tb[NDA_MAX + 1];
4506	struct sk_buff *skb;
4507	int brport_idx = 0;
4508	u8 ndm_flags = 0;
4509	int br_idx = 0;
4510	u8 *addr = NULL;
4511	u16 vid = 0;
4512	int err;
4513
4514	err = valid_fdb_get_strict(nlh, tb, &ndm_flags, &br_idx,
4515				   &brport_idx, &addr, &vid, extack);
4516	if (err < 0)
4517		return err;
4518
4519	if (!addr) {
4520		NL_SET_ERR_MSG(extack, "Missing lookup address for fdb get request");
4521		return -EINVAL;
4522	}
4523
4524	if (brport_idx) {
4525		dev = __dev_get_by_index(net, brport_idx);
4526		if (!dev) {
4527			NL_SET_ERR_MSG(extack, "Unknown device ifindex");
4528			return -ENODEV;
4529		}
4530	}
4531
4532	if (br_idx) {
4533		if (dev) {
4534			NL_SET_ERR_MSG(extack, "Master and device are mutually exclusive");
4535			return -EINVAL;
4536		}
4537
4538		br_dev = __dev_get_by_index(net, br_idx);
4539		if (!br_dev) {
4540			NL_SET_ERR_MSG(extack, "Invalid master ifindex");
4541			return -EINVAL;
4542		}
4543		ops = br_dev->netdev_ops;
4544	}
4545
4546	if (dev) {
4547		if (!ndm_flags || (ndm_flags & NTF_MASTER)) {
4548			if (!netif_is_bridge_port(dev)) {
4549				NL_SET_ERR_MSG(extack, "Device is not a bridge port");
4550				return -EINVAL;
4551			}
4552			br_dev = netdev_master_upper_dev_get(dev);
4553			if (!br_dev) {
4554				NL_SET_ERR_MSG(extack, "Master of device not found");
4555				return -EINVAL;
4556			}
4557			ops = br_dev->netdev_ops;
4558		} else {
4559			if (!(ndm_flags & NTF_SELF)) {
4560				NL_SET_ERR_MSG(extack, "Missing NTF_SELF");
4561				return -EINVAL;
4562			}
4563			ops = dev->netdev_ops;
4564		}
4565	}
4566
4567	if (!br_dev && !dev) {
4568		NL_SET_ERR_MSG(extack, "No device specified");
4569		return -ENODEV;
4570	}
4571
4572	if (!ops || !ops->ndo_fdb_get) {
4573		NL_SET_ERR_MSG(extack, "Fdb get operation not supported by device");
4574		return -EOPNOTSUPP;
4575	}
4576
4577	skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4578	if (!skb)
4579		return -ENOBUFS;
4580
4581	if (br_dev)
4582		dev = br_dev;
4583	err = ops->ndo_fdb_get(skb, tb, dev, addr, vid,
4584			       NETLINK_CB(in_skb).portid,
4585			       nlh->nlmsg_seq, extack);
4586	if (err)
4587		goto out;
4588
4589	return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4590out:
4591	kfree_skb(skb);
4592	return err;
4593}
4594
4595static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
4596			       unsigned int attrnum, unsigned int flag)
4597{
4598	if (mask & flag)
4599		return nla_put_u8(skb, attrnum, !!(flags & flag));
4600	return 0;
4601}
4602
4603int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
4604			    struct net_device *dev, u16 mode,
4605			    u32 flags, u32 mask, int nlflags,
4606			    u32 filter_mask,
4607			    int (*vlan_fill)(struct sk_buff *skb,
4608					     struct net_device *dev,
4609					     u32 filter_mask))
4610{
4611	struct nlmsghdr *nlh;
4612	struct ifinfomsg *ifm;
4613	struct nlattr *br_afspec;
4614	struct nlattr *protinfo;
4615	u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
4616	struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4617	int err = 0;
4618
4619	nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
4620	if (nlh == NULL)
4621		return -EMSGSIZE;
4622
4623	ifm = nlmsg_data(nlh);
4624	ifm->ifi_family = AF_BRIDGE;
4625	ifm->__ifi_pad = 0;
4626	ifm->ifi_type = dev->type;
4627	ifm->ifi_index = dev->ifindex;
4628	ifm->ifi_flags = dev_get_flags(dev);
4629	ifm->ifi_change = 0;
4630
4631
4632	if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4633	    nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4634	    nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
4635	    (br_dev &&
4636	     nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
4637	    (dev->addr_len &&
4638	     nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4639	    (dev->ifindex != dev_get_iflink(dev) &&
4640	     nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
4641		goto nla_put_failure;
4642
4643	br_afspec = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
4644	if (!br_afspec)
4645		goto nla_put_failure;
4646
4647	if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
4648		nla_nest_cancel(skb, br_afspec);
4649		goto nla_put_failure;
4650	}
4651
4652	if (mode != BRIDGE_MODE_UNDEF) {
4653		if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
4654			nla_nest_cancel(skb, br_afspec);
4655			goto nla_put_failure;
4656		}
4657	}
4658	if (vlan_fill) {
4659		err = vlan_fill(skb, dev, filter_mask);
4660		if (err) {
4661			nla_nest_cancel(skb, br_afspec);
4662			goto nla_put_failure;
4663		}
4664	}
4665	nla_nest_end(skb, br_afspec);
4666
4667	protinfo = nla_nest_start(skb, IFLA_PROTINFO);
4668	if (!protinfo)
4669		goto nla_put_failure;
4670
4671	if (brport_nla_put_flag(skb, flags, mask,
4672				IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
4673	    brport_nla_put_flag(skb, flags, mask,
4674				IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
4675	    brport_nla_put_flag(skb, flags, mask,
4676				IFLA_BRPORT_FAST_LEAVE,
4677				BR_MULTICAST_FAST_LEAVE) ||
4678	    brport_nla_put_flag(skb, flags, mask,
4679				IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
4680	    brport_nla_put_flag(skb, flags, mask,
4681				IFLA_BRPORT_LEARNING, BR_LEARNING) ||
4682	    brport_nla_put_flag(skb, flags, mask,
4683				IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
4684	    brport_nla_put_flag(skb, flags, mask,
4685				IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
4686	    brport_nla_put_flag(skb, flags, mask,
4687				IFLA_BRPORT_PROXYARP, BR_PROXYARP) ||
4688	    brport_nla_put_flag(skb, flags, mask,
4689				IFLA_BRPORT_MCAST_FLOOD, BR_MCAST_FLOOD) ||
4690	    brport_nla_put_flag(skb, flags, mask,
4691				IFLA_BRPORT_BCAST_FLOOD, BR_BCAST_FLOOD)) {
4692		nla_nest_cancel(skb, protinfo);
4693		goto nla_put_failure;
4694	}
4695
4696	nla_nest_end(skb, protinfo);
4697
4698	nlmsg_end(skb, nlh);
4699	return 0;
4700nla_put_failure:
4701	nlmsg_cancel(skb, nlh);
4702	return err ? err : -EMSGSIZE;
4703}
4704EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
4705
4706static int valid_bridge_getlink_req(const struct nlmsghdr *nlh,
4707				    bool strict_check, u32 *filter_mask,
4708				    struct netlink_ext_ack *extack)
4709{
4710	struct nlattr *tb[IFLA_MAX+1];
4711	int err, i;
4712
4713	if (strict_check) {
4714		struct ifinfomsg *ifm;
4715
4716		if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
4717			NL_SET_ERR_MSG(extack, "Invalid header for bridge link dump");
4718			return -EINVAL;
4719		}
4720
4721		ifm = nlmsg_data(nlh);
4722		if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
4723		    ifm->ifi_change || ifm->ifi_index) {
4724			NL_SET_ERR_MSG(extack, "Invalid values in header for bridge link dump request");
4725			return -EINVAL;
4726		}
4727
4728		err = nlmsg_parse_deprecated_strict(nlh,
4729						    sizeof(struct ifinfomsg),
4730						    tb, IFLA_MAX, ifla_policy,
4731						    extack);
4732	} else {
4733		err = nlmsg_parse_deprecated(nlh, sizeof(struct ifinfomsg),
4734					     tb, IFLA_MAX, ifla_policy,
4735					     extack);
4736	}
4737	if (err < 0)
4738		return err;
4739
4740	/* new attributes should only be added with strict checking */
4741	for (i = 0; i <= IFLA_MAX; ++i) {
4742		if (!tb[i])
4743			continue;
4744
4745		switch (i) {
4746		case IFLA_EXT_MASK:
4747			*filter_mask = nla_get_u32(tb[i]);
4748			break;
4749		default:
4750			if (strict_check) {
4751				NL_SET_ERR_MSG(extack, "Unsupported attribute in bridge link dump request");
4752				return -EINVAL;
4753			}
4754		}
4755	}
4756
4757	return 0;
4758}
4759
4760static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
4761{
4762	const struct nlmsghdr *nlh = cb->nlh;
4763	struct net *net = sock_net(skb->sk);
4764	struct net_device *dev;
4765	int idx = 0;
4766	u32 portid = NETLINK_CB(cb->skb).portid;
4767	u32 seq = nlh->nlmsg_seq;
4768	u32 filter_mask = 0;
4769	int err;
4770
4771	err = valid_bridge_getlink_req(nlh, cb->strict_check, &filter_mask,
4772				       cb->extack);
4773	if (err < 0 && cb->strict_check)
4774		return err;
4775
4776	rcu_read_lock();
4777	for_each_netdev_rcu(net, dev) {
4778		const struct net_device_ops *ops = dev->netdev_ops;
4779		struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4780
4781		if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
4782			if (idx >= cb->args[0]) {
4783				err = br_dev->netdev_ops->ndo_bridge_getlink(
4784						skb, portid, seq, dev,
4785						filter_mask, NLM_F_MULTI);
4786				if (err < 0 && err != -EOPNOTSUPP) {
4787					if (likely(skb->len))
4788						break;
4789
4790					goto out_err;
4791				}
4792			}
4793			idx++;
4794		}
4795
4796		if (ops->ndo_bridge_getlink) {
4797			if (idx >= cb->args[0]) {
4798				err = ops->ndo_bridge_getlink(skb, portid,
4799							      seq, dev,
4800							      filter_mask,
4801							      NLM_F_MULTI);
4802				if (err < 0 && err != -EOPNOTSUPP) {
4803					if (likely(skb->len))
4804						break;
4805
4806					goto out_err;
4807				}
4808			}
4809			idx++;
4810		}
4811	}
4812	err = skb->len;
4813out_err:
4814	rcu_read_unlock();
4815	cb->args[0] = idx;
4816
4817	return err;
4818}
4819
4820static inline size_t bridge_nlmsg_size(void)
4821{
4822	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4823		+ nla_total_size(IFNAMSIZ)	/* IFLA_IFNAME */
4824		+ nla_total_size(MAX_ADDR_LEN)	/* IFLA_ADDRESS */
4825		+ nla_total_size(sizeof(u32))	/* IFLA_MASTER */
4826		+ nla_total_size(sizeof(u32))	/* IFLA_MTU */
4827		+ nla_total_size(sizeof(u32))	/* IFLA_LINK */
4828		+ nla_total_size(sizeof(u32))	/* IFLA_OPERSTATE */
4829		+ nla_total_size(sizeof(u8))	/* IFLA_PROTINFO */
4830		+ nla_total_size(sizeof(struct nlattr))	/* IFLA_AF_SPEC */
4831		+ nla_total_size(sizeof(u16))	/* IFLA_BRIDGE_FLAGS */
4832		+ nla_total_size(sizeof(u16));	/* IFLA_BRIDGE_MODE */
4833}
4834
4835static int rtnl_bridge_notify(struct net_device *dev)
4836{
4837	struct net *net = dev_net(dev);
4838	struct sk_buff *skb;
4839	int err = -EOPNOTSUPP;
4840
4841	if (!dev->netdev_ops->ndo_bridge_getlink)
4842		return 0;
4843
4844	skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
4845	if (!skb) {
4846		err = -ENOMEM;
4847		goto errout;
4848	}
4849
4850	err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
4851	if (err < 0)
4852		goto errout;
4853
4854	/* Notification info is only filled for bridge ports, not the bridge
4855	 * device itself. Therefore, a zero notification length is valid and
4856	 * should not result in an error.
4857	 */
4858	if (!skb->len)
4859		goto errout;
4860
4861	rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
4862	return 0;
4863errout:
4864	WARN_ON(err == -EMSGSIZE);
4865	kfree_skb(skb);
4866	if (err)
4867		rtnl_set_sk_err(net, RTNLGRP_LINK, err);
4868	return err;
4869}
4870
4871static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
4872			       struct netlink_ext_ack *extack)
4873{
4874	struct net *net = sock_net(skb->sk);
4875	struct ifinfomsg *ifm;
4876	struct net_device *dev;
4877	struct nlattr *br_spec, *attr = NULL;
4878	int rem, err = -EOPNOTSUPP;
4879	u16 flags = 0;
4880	bool have_flags = false;
4881
4882	if (nlmsg_len(nlh) < sizeof(*ifm))
4883		return -EINVAL;
4884
4885	ifm = nlmsg_data(nlh);
4886	if (ifm->ifi_family != AF_BRIDGE)
4887		return -EPFNOSUPPORT;
4888
4889	dev = __dev_get_by_index(net, ifm->ifi_index);
4890	if (!dev) {
4891		NL_SET_ERR_MSG(extack, "unknown ifindex");
4892		return -ENODEV;
4893	}
4894
4895	br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4896	if (br_spec) {
4897		nla_for_each_nested(attr, br_spec, rem) {
4898			if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4899				if (nla_len(attr) < sizeof(flags))
4900					return -EINVAL;
4901
4902				have_flags = true;
4903				flags = nla_get_u16(attr);
4904				break;
 
 
 
 
4905			}
4906		}
4907	}
4908
4909	if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
4910		struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4911
4912		if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
4913			err = -EOPNOTSUPP;
4914			goto out;
4915		}
4916
4917		err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags,
4918							     extack);
4919		if (err)
4920			goto out;
4921
4922		flags &= ~BRIDGE_FLAGS_MASTER;
4923	}
4924
4925	if ((flags & BRIDGE_FLAGS_SELF)) {
4926		if (!dev->netdev_ops->ndo_bridge_setlink)
4927			err = -EOPNOTSUPP;
4928		else
4929			err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
4930								  flags,
4931								  extack);
4932		if (!err) {
4933			flags &= ~BRIDGE_FLAGS_SELF;
4934
4935			/* Generate event to notify upper layer of bridge
4936			 * change
4937			 */
4938			err = rtnl_bridge_notify(dev);
4939		}
4940	}
4941
4942	if (have_flags)
4943		memcpy(nla_data(attr), &flags, sizeof(flags));
4944out:
4945	return err;
4946}
4947
4948static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
4949			       struct netlink_ext_ack *extack)
4950{
4951	struct net *net = sock_net(skb->sk);
4952	struct ifinfomsg *ifm;
4953	struct net_device *dev;
4954	struct nlattr *br_spec, *attr = NULL;
4955	int rem, err = -EOPNOTSUPP;
4956	u16 flags = 0;
4957	bool have_flags = false;
4958
4959	if (nlmsg_len(nlh) < sizeof(*ifm))
4960		return -EINVAL;
4961
4962	ifm = nlmsg_data(nlh);
4963	if (ifm->ifi_family != AF_BRIDGE)
4964		return -EPFNOSUPPORT;
4965
4966	dev = __dev_get_by_index(net, ifm->ifi_index);
4967	if (!dev) {
4968		NL_SET_ERR_MSG(extack, "unknown ifindex");
4969		return -ENODEV;
4970	}
4971
4972	br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4973	if (br_spec) {
4974		nla_for_each_nested(attr, br_spec, rem) {
4975			if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4976				if (nla_len(attr) < sizeof(flags))
4977					return -EINVAL;
4978
4979				have_flags = true;
4980				flags = nla_get_u16(attr);
4981				break;
4982			}
4983		}
4984	}
4985
4986	if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
4987		struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4988
4989		if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
4990			err = -EOPNOTSUPP;
4991			goto out;
4992		}
4993
4994		err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
4995		if (err)
4996			goto out;
4997
4998		flags &= ~BRIDGE_FLAGS_MASTER;
4999	}
5000
5001	if ((flags & BRIDGE_FLAGS_SELF)) {
5002		if (!dev->netdev_ops->ndo_bridge_dellink)
5003			err = -EOPNOTSUPP;
5004		else
5005			err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
5006								  flags);
5007
5008		if (!err) {
5009			flags &= ~BRIDGE_FLAGS_SELF;
5010
5011			/* Generate event to notify upper layer of bridge
5012			 * change
5013			 */
5014			err = rtnl_bridge_notify(dev);
5015		}
5016	}
5017
5018	if (have_flags)
5019		memcpy(nla_data(attr), &flags, sizeof(flags));
5020out:
5021	return err;
5022}
5023
5024static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
5025{
5026	return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
5027	       (!idxattr || idxattr == attrid);
5028}
5029
5030#define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1)
5031static int rtnl_get_offload_stats_attr_size(int attr_id)
5032{
5033	switch (attr_id) {
5034	case IFLA_OFFLOAD_XSTATS_CPU_HIT:
5035		return sizeof(struct rtnl_link_stats64);
5036	}
 
5037
5038	return 0;
 
 
 
 
5039}
5040
5041static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev,
5042				  int *prividx)
 
5043{
 
5044	struct nlattr *attr = NULL;
5045	int attr_id, size;
5046	void *attr_data;
5047	int err;
5048
5049	if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
5050	      dev->netdev_ops->ndo_get_offload_stats))
5051		return -ENODATA;
5052
5053	for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
5054	     attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
5055		if (attr_id < *prividx)
5056			continue;
5057
5058		size = rtnl_get_offload_stats_attr_size(attr_id);
5059		if (!size)
5060			continue;
5061
5062		if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
5063			continue;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5064
5065		attr = nla_reserve_64bit(skb, attr_id, size,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5066					 IFLA_OFFLOAD_XSTATS_UNSPEC);
5067		if (!attr)
5068			goto nla_put_failure;
5069
5070		attr_data = nla_data(attr);
5071		memset(attr_data, 0, size);
5072		err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev,
5073							     attr_data);
5074		if (err)
5075			goto get_offload_stats_failure;
 
 
 
 
5076	}
5077
5078	if (!attr)
5079		return -ENODATA;
5080
5081	*prividx = 0;
5082	return 0;
 
5083
5084nla_put_failure:
5085	err = -EMSGSIZE;
5086get_offload_stats_failure:
5087	*prividx = attr_id;
5088	return err;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5089}
5090
5091static int rtnl_get_offload_stats_size(const struct net_device *dev)
 
5092{
 
 
5093	int nla_size = 0;
5094	int attr_id;
5095	int size;
5096
5097	if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
5098	      dev->netdev_ops->ndo_get_offload_stats))
5099		return 0;
 
 
5100
5101	for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
5102	     attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
5103		if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
5104			continue;
5105		size = rtnl_get_offload_stats_attr_size(attr_id);
 
 
5106		nla_size += nla_total_size_64bit(size);
5107	}
5108
5109	if (nla_size != 0)
5110		nla_size += nla_total_size(0);
5111
5112	return nla_size;
5113}
5114
 
 
 
 
 
 
 
5115static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
5116			       int type, u32 pid, u32 seq, u32 change,
5117			       unsigned int flags, unsigned int filter_mask,
5118			       int *idxattr, int *prividx)
 
 
5119{
 
5120	struct if_stats_msg *ifsm;
5121	struct nlmsghdr *nlh;
5122	struct nlattr *attr;
5123	int s_prividx = *prividx;
5124	int err;
5125
5126	ASSERT_RTNL();
5127
5128	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
5129	if (!nlh)
5130		return -EMSGSIZE;
5131
5132	ifsm = nlmsg_data(nlh);
5133	ifsm->family = PF_UNSPEC;
5134	ifsm->pad1 = 0;
5135	ifsm->pad2 = 0;
5136	ifsm->ifindex = dev->ifindex;
5137	ifsm->filter_mask = filter_mask;
5138
5139	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
5140		struct rtnl_link_stats64 *sp;
5141
5142		attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
5143					 sizeof(struct rtnl_link_stats64),
5144					 IFLA_STATS_UNSPEC);
5145		if (!attr)
 
5146			goto nla_put_failure;
 
5147
5148		sp = nla_data(attr);
5149		dev_get_stats(dev, sp);
5150	}
5151
5152	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
5153		const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
5154
5155		if (ops && ops->fill_linkxstats) {
5156			*idxattr = IFLA_STATS_LINK_XSTATS;
5157			attr = nla_nest_start_noflag(skb,
5158						     IFLA_STATS_LINK_XSTATS);
5159			if (!attr)
 
5160				goto nla_put_failure;
 
5161
5162			err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
5163			nla_nest_end(skb, attr);
5164			if (err)
5165				goto nla_put_failure;
5166			*idxattr = 0;
5167		}
5168	}
5169
5170	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
5171			     *idxattr)) {
5172		const struct rtnl_link_ops *ops = NULL;
5173		const struct net_device *master;
5174
5175		master = netdev_master_upper_dev_get(dev);
5176		if (master)
5177			ops = master->rtnl_link_ops;
5178		if (ops && ops->fill_linkxstats) {
5179			*idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
5180			attr = nla_nest_start_noflag(skb,
5181						     IFLA_STATS_LINK_XSTATS_SLAVE);
5182			if (!attr)
 
5183				goto nla_put_failure;
 
5184
5185			err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
5186			nla_nest_end(skb, attr);
5187			if (err)
5188				goto nla_put_failure;
5189			*idxattr = 0;
5190		}
5191	}
5192
5193	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
5194			     *idxattr)) {
 
 
 
5195		*idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
5196		attr = nla_nest_start_noflag(skb,
5197					     IFLA_STATS_LINK_OFFLOAD_XSTATS);
5198		if (!attr)
 
5199			goto nla_put_failure;
 
5200
5201		err = rtnl_get_offload_stats(skb, dev, prividx);
 
5202		if (err == -ENODATA)
5203			nla_nest_cancel(skb, attr);
5204		else
5205			nla_nest_end(skb, attr);
5206
5207		if (err && err != -ENODATA)
5208			goto nla_put_failure;
5209		*idxattr = 0;
5210	}
5211
5212	if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) {
5213		struct rtnl_af_ops *af_ops;
5214
5215		*idxattr = IFLA_STATS_AF_SPEC;
5216		attr = nla_nest_start_noflag(skb, IFLA_STATS_AF_SPEC);
5217		if (!attr)
 
5218			goto nla_put_failure;
 
5219
5220		rcu_read_lock();
5221		list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
5222			if (af_ops->fill_stats_af) {
5223				struct nlattr *af;
5224				int err;
5225
5226				af = nla_nest_start_noflag(skb,
5227							   af_ops->family);
5228				if (!af) {
5229					rcu_read_unlock();
 
5230					goto nla_put_failure;
5231				}
5232				err = af_ops->fill_stats_af(skb, dev);
5233
5234				if (err == -ENODATA) {
5235					nla_nest_cancel(skb, af);
5236				} else if (err < 0) {
5237					rcu_read_unlock();
5238					goto nla_put_failure;
5239				}
5240
5241				nla_nest_end(skb, af);
5242			}
5243		}
5244		rcu_read_unlock();
5245
5246		nla_nest_end(skb, attr);
5247
5248		*idxattr = 0;
5249	}
5250
5251	nlmsg_end(skb, nlh);
5252
5253	return 0;
5254
5255nla_put_failure:
5256	/* not a multi message or no progress mean a real error */
5257	if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
5258		nlmsg_cancel(skb, nlh);
5259	else
5260		nlmsg_end(skb, nlh);
5261
5262	return -EMSGSIZE;
5263}
5264
5265static size_t if_nlmsg_stats_size(const struct net_device *dev,
5266				  u32 filter_mask)
5267{
5268	size_t size = NLMSG_ALIGN(sizeof(struct if_stats_msg));
 
5269
5270	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
5271		size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
5272
5273	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
5274		const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
5275		int attr = IFLA_STATS_LINK_XSTATS;
5276
5277		if (ops && ops->get_linkxstats_size) {
5278			size += nla_total_size(ops->get_linkxstats_size(dev,
5279									attr));
5280			/* for IFLA_STATS_LINK_XSTATS */
5281			size += nla_total_size(0);
5282		}
5283	}
5284
5285	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
5286		struct net_device *_dev = (struct net_device *)dev;
5287		const struct rtnl_link_ops *ops = NULL;
5288		const struct net_device *master;
5289
5290		/* netdev_master_upper_dev_get can't take const */
5291		master = netdev_master_upper_dev_get(_dev);
5292		if (master)
5293			ops = master->rtnl_link_ops;
5294		if (ops && ops->get_linkxstats_size) {
5295			int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
5296
5297			size += nla_total_size(ops->get_linkxstats_size(dev,
5298									attr));
5299			/* for IFLA_STATS_LINK_XSTATS_SLAVE */
5300			size += nla_total_size(0);
5301		}
5302	}
5303
5304	if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0))
5305		size += rtnl_get_offload_stats_size(dev);
 
 
 
 
5306
5307	if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) {
5308		struct rtnl_af_ops *af_ops;
5309
5310		/* for IFLA_STATS_AF_SPEC */
5311		size += nla_total_size(0);
5312
5313		rcu_read_lock();
5314		list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
5315			if (af_ops->get_stats_af_size) {
5316				size += nla_total_size(
5317					af_ops->get_stats_af_size(dev));
5318
5319				/* for AF_* */
5320				size += nla_total_size(0);
5321			}
5322		}
5323		rcu_read_unlock();
5324	}
5325
5326	return size;
5327}
5328
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5329static int rtnl_valid_stats_req(const struct nlmsghdr *nlh, bool strict_check,
5330				bool is_dump, struct netlink_ext_ack *extack)
5331{
5332	struct if_stats_msg *ifsm;
5333
5334	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifsm))) {
5335		NL_SET_ERR_MSG(extack, "Invalid header for stats dump");
5336		return -EINVAL;
5337	}
5338
5339	if (!strict_check)
5340		return 0;
5341
5342	ifsm = nlmsg_data(nlh);
5343
5344	/* only requests using strict checks can pass data to influence
5345	 * the dump. The legacy exception is filter_mask.
5346	 */
5347	if (ifsm->pad1 || ifsm->pad2 || (is_dump && ifsm->ifindex)) {
5348		NL_SET_ERR_MSG(extack, "Invalid values in header for stats dump request");
5349		return -EINVAL;
5350	}
5351	if (nlmsg_attrlen(nlh, sizeof(*ifsm))) {
5352		NL_SET_ERR_MSG(extack, "Invalid attributes after stats header");
5353		return -EINVAL;
5354	}
5355	if (ifsm->filter_mask >= IFLA_STATS_FILTER_BIT(IFLA_STATS_MAX + 1)) {
5356		NL_SET_ERR_MSG(extack, "Invalid stats requested through filter mask");
5357		return -EINVAL;
5358	}
5359
5360	return 0;
5361}
5362
5363static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh,
5364			  struct netlink_ext_ack *extack)
5365{
 
5366	struct net *net = sock_net(skb->sk);
5367	struct net_device *dev = NULL;
5368	int idxattr = 0, prividx = 0;
5369	struct if_stats_msg *ifsm;
5370	struct sk_buff *nskb;
5371	u32 filter_mask;
5372	int err;
5373
5374	err = rtnl_valid_stats_req(nlh, netlink_strict_get_check(skb),
5375				   false, extack);
5376	if (err)
5377		return err;
5378
5379	ifsm = nlmsg_data(nlh);
5380	if (ifsm->ifindex > 0)
5381		dev = __dev_get_by_index(net, ifsm->ifindex);
5382	else
5383		return -EINVAL;
5384
5385	if (!dev)
5386		return -ENODEV;
5387
5388	filter_mask = ifsm->filter_mask;
5389	if (!filter_mask)
5390		return -EINVAL;
 
5391
5392	nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL);
 
 
 
 
5393	if (!nskb)
5394		return -ENOBUFS;
5395
5396	err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
5397				  NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
5398				  0, filter_mask, &idxattr, &prividx);
5399	if (err < 0) {
5400		/* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
5401		WARN_ON(err == -EMSGSIZE);
5402		kfree_skb(nskb);
5403	} else {
5404		err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
5405	}
5406
5407	return err;
5408}
5409
5410static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
5411{
5412	struct netlink_ext_ack *extack = cb->extack;
5413	int h, s_h, err, s_idx, s_idxattr, s_prividx;
5414	struct net *net = sock_net(skb->sk);
5415	unsigned int flags = NLM_F_MULTI;
5416	struct if_stats_msg *ifsm;
5417	struct hlist_head *head;
 
 
 
 
5418	struct net_device *dev;
5419	u32 filter_mask = 0;
5420	int idx = 0;
5421
5422	s_h = cb->args[0];
5423	s_idx = cb->args[1];
5424	s_idxattr = cb->args[2];
5425	s_prividx = cb->args[3];
5426
5427	cb->seq = net->dev_base_seq;
5428
5429	err = rtnl_valid_stats_req(cb->nlh, cb->strict_check, true, extack);
5430	if (err)
5431		return err;
5432
5433	ifsm = nlmsg_data(cb->nlh);
5434	filter_mask = ifsm->filter_mask;
5435	if (!filter_mask) {
5436		NL_SET_ERR_MSG(extack, "Filter mask must be set for stats dump");
5437		return -EINVAL;
5438	}
5439
5440	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5441		idx = 0;
5442		head = &net->dev_index_head[h];
5443		hlist_for_each_entry(dev, head, index_hlist) {
5444			if (idx < s_idx)
5445				goto cont;
5446			err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
5447						  NETLINK_CB(cb->skb).portid,
5448						  cb->nlh->nlmsg_seq, 0,
5449						  flags, filter_mask,
5450						  &s_idxattr, &s_prividx);
5451			/* If we ran out of room on the first message,
5452			 * we're in trouble
5453			 */
5454			WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
5455
5456			if (err < 0)
5457				goto out;
5458			s_prividx = 0;
5459			s_idxattr = 0;
5460			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5461cont:
5462			idx++;
5463		}
 
 
 
 
 
 
 
 
 
5464	}
5465out:
5466	cb->args[3] = s_prividx;
5467	cb->args[2] = s_idxattr;
5468	cb->args[1] = idx;
5469	cb->args[0] = h;
5470
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5471	return skb->len;
5472}
5473
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5474/* Process one rtnetlink message. */
5475
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5476static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
5477			     struct netlink_ext_ack *extack)
5478{
5479	struct net *net = sock_net(skb->sk);
5480	struct rtnl_link *link;
 
5481	struct module *owner;
5482	int err = -EOPNOTSUPP;
5483	rtnl_doit_func doit;
5484	unsigned int flags;
5485	int kind;
5486	int family;
5487	int type;
5488
5489	type = nlh->nlmsg_type;
5490	if (type > RTM_MAX)
5491		return -EOPNOTSUPP;
5492
5493	type -= RTM_BASE;
5494
5495	/* All the messages must have at least 1 byte length */
5496	if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
5497		return 0;
5498
5499	family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
5500	kind = type&3;
5501
5502	if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
5503		return -EPERM;
5504
5505	rcu_read_lock();
5506	if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
5507		struct sock *rtnl;
5508		rtnl_dumpit_func dumpit;
5509		u32 min_dump_alloc = 0;
5510
5511		link = rtnl_get_link(family, type);
5512		if (!link || !link->dumpit) {
5513			family = PF_UNSPEC;
5514			link = rtnl_get_link(family, type);
5515			if (!link || !link->dumpit)
5516				goto err_unlock;
5517		}
5518		owner = link->owner;
5519		dumpit = link->dumpit;
 
5520
5521		if (type == RTM_GETLINK - RTM_BASE)
5522			min_dump_alloc = rtnl_calcit(skb, nlh);
5523
5524		err = 0;
5525		/* need to do this before rcu_read_unlock() */
5526		if (!try_module_get(owner))
5527			err = -EPROTONOSUPPORT;
5528
5529		rcu_read_unlock();
5530
5531		rtnl = net->rtnl;
5532		if (err == 0) {
5533			struct netlink_dump_control c = {
5534				.dump		= dumpit,
5535				.min_dump_alloc	= min_dump_alloc,
5536				.module		= owner,
 
5537			};
5538			err = netlink_dump_start(rtnl, skb, nlh, &c);
5539			/* netlink_dump_start() will keep a reference on
5540			 * module if dump is still in progress.
5541			 */
5542			module_put(owner);
5543		}
5544		return err;
5545	}
5546
5547	link = rtnl_get_link(family, type);
5548	if (!link || !link->doit) {
5549		family = PF_UNSPEC;
5550		link = rtnl_get_link(PF_UNSPEC, type);
5551		if (!link || !link->doit)
5552			goto out_unlock;
5553	}
5554
5555	owner = link->owner;
5556	if (!try_module_get(owner)) {
5557		err = -EPROTONOSUPPORT;
5558		goto out_unlock;
5559	}
5560
5561	flags = link->flags;
 
 
 
 
 
 
 
5562	if (flags & RTNL_FLAG_DOIT_UNLOCKED) {
5563		doit = link->doit;
5564		rcu_read_unlock();
5565		if (doit)
5566			err = doit(skb, nlh, extack);
5567		module_put(owner);
5568		return err;
5569	}
5570	rcu_read_unlock();
5571
5572	rtnl_lock();
5573	link = rtnl_get_link(family, type);
5574	if (link && link->doit)
5575		err = link->doit(skb, nlh, extack);
5576	rtnl_unlock();
5577
5578	module_put(owner);
5579
5580	return err;
5581
5582out_unlock:
5583	rcu_read_unlock();
5584	return err;
5585
5586err_unlock:
5587	rcu_read_unlock();
5588	return -EOPNOTSUPP;
5589}
5590
5591static void rtnetlink_rcv(struct sk_buff *skb)
5592{
5593	netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
5594}
5595
5596static int rtnetlink_bind(struct net *net, int group)
5597{
5598	switch (group) {
5599	case RTNLGRP_IPV4_MROUTE_R:
5600	case RTNLGRP_IPV6_MROUTE_R:
5601		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
5602			return -EPERM;
5603		break;
5604	}
5605	return 0;
5606}
5607
5608static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
5609{
5610	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
5611
5612	switch (event) {
5613	case NETDEV_REBOOT:
5614	case NETDEV_CHANGEMTU:
5615	case NETDEV_CHANGEADDR:
5616	case NETDEV_CHANGENAME:
5617	case NETDEV_FEAT_CHANGE:
5618	case NETDEV_BONDING_FAILOVER:
5619	case NETDEV_POST_TYPE_CHANGE:
5620	case NETDEV_NOTIFY_PEERS:
5621	case NETDEV_CHANGEUPPER:
5622	case NETDEV_RESEND_IGMP:
5623	case NETDEV_CHANGEINFODATA:
5624	case NETDEV_CHANGELOWERSTATE:
5625	case NETDEV_CHANGE_TX_QUEUE_LEN:
5626		rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event),
5627				   GFP_KERNEL, NULL, 0);
5628		break;
5629	default:
5630		break;
5631	}
5632	return NOTIFY_DONE;
5633}
5634
5635static struct notifier_block rtnetlink_dev_notifier = {
5636	.notifier_call	= rtnetlink_event,
5637};
5638
5639
5640static int __net_init rtnetlink_net_init(struct net *net)
5641{
5642	struct sock *sk;
5643	struct netlink_kernel_cfg cfg = {
5644		.groups		= RTNLGRP_MAX,
5645		.input		= rtnetlink_rcv,
5646		.cb_mutex	= &rtnl_mutex,
5647		.flags		= NL_CFG_F_NONROOT_RECV,
5648		.bind		= rtnetlink_bind,
5649	};
5650
5651	sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
5652	if (!sk)
5653		return -ENOMEM;
5654	net->rtnl = sk;
5655	return 0;
5656}
5657
5658static void __net_exit rtnetlink_net_exit(struct net *net)
5659{
5660	netlink_kernel_release(net->rtnl);
5661	net->rtnl = NULL;
5662}
5663
5664static struct pernet_operations rtnetlink_net_ops = {
5665	.init = rtnetlink_net_init,
5666	.exit = rtnetlink_net_exit,
5667};
5668
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5669void __init rtnetlink_init(void)
5670{
5671	if (register_pernet_subsys(&rtnetlink_net_ops))
5672		panic("rtnetlink_init: cannot initialize rtnetlink\n");
5673
5674	register_netdevice_notifier(&rtnetlink_dev_notifier);
5675
5676	rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
5677		      rtnl_dump_ifinfo, 0);
5678	rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0);
5679	rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0);
5680	rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0);
5681
5682	rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0);
5683	rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0);
5684	rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0);
5685
5686	rtnl_register(PF_UNSPEC, RTM_NEWLINKPROP, rtnl_newlinkprop, NULL, 0);
5687	rtnl_register(PF_UNSPEC, RTM_DELLINKPROP, rtnl_dellinkprop, NULL, 0);
5688
5689	rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0);
5690	rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 0);
5691	rtnl_register(PF_BRIDGE, RTM_GETNEIGH, rtnl_fdb_get, rtnl_fdb_dump, 0);
5692
5693	rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0);
5694	rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0);
5695	rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0);
5696
5697	rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
5698		      0);
5699}