1// SPDX-License-Identifier: GPL-1.0+
   2/*
   3 * originally based on the dummy device.
   4 *
   5 * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
   6 * Based on dummy.c, and eql.c devices.
   7 *
   8 * bonding.c: an Ethernet Bonding driver
   9 *
  10 * This is useful to talk to a Cisco EtherChannel compatible equipment:
  11 *	Cisco 5500
  12 *	Sun Trunking (Solaris)
  13 *	Alteon AceDirector Trunks
  14 *	Linux Bonding
  15 *	and probably many L2 switches ...
  16 *
  17 * How it works:
  18 *    ifconfig bond0 ipaddress netmask up
  19 *      will setup a network device, with an ip address.  No mac address
  20 *	will be assigned at this time.  The hw mac address will come from
  21 *	the first slave bonded to the channel.  All slaves will then use
  22 *	this hw mac address.
  23 *
  24 *    ifconfig bond0 down
  25 *         will release all slaves, marking them as down.
  26 *
  27 *    ifenslave bond0 eth0
  28 *	will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
  29 *	a: be used as initial mac address
  30 *	b: if a hw mac address already is there, eth0's hw mac address
  31 *	   will then be set from bond0.
  32 *
  33 */
  34
  35#include <linux/kernel.h>
  36#include <linux/module.h>
  37#include <linux/types.h>
  38#include <linux/fcntl.h>
  39#include <linux/filter.h>
  40#include <linux/interrupt.h>
  41#include <linux/ptrace.h>
  42#include <linux/ioport.h>
  43#include <linux/in.h>
  44#include <net/ip.h>
  45#include <linux/ip.h>
  46#include <linux/icmp.h>
  47#include <linux/icmpv6.h>
  48#include <linux/tcp.h>
  49#include <linux/udp.h>
  50#include <linux/slab.h>
  51#include <linux/string.h>
  52#include <linux/init.h>
  53#include <linux/timer.h>
  54#include <linux/socket.h>
  55#include <linux/ctype.h>
  56#include <linux/inet.h>
  57#include <linux/bitops.h>
  58#include <linux/io.h>
  59#include <asm/dma.h>
  60#include <linux/uaccess.h>
  61#include <linux/errno.h>
  62#include <linux/netdevice.h>
  63#include <linux/inetdevice.h>
  64#include <linux/igmp.h>
  65#include <linux/etherdevice.h>
  66#include <linux/skbuff.h>
  67#include <net/sock.h>
  68#include <linux/rtnetlink.h>
  69#include <linux/smp.h>
  70#include <linux/if_ether.h>
  71#include <net/arp.h>
  72#include <linux/mii.h>
  73#include <linux/ethtool.h>
  74#include <linux/if_vlan.h>
  75#include <linux/if_bonding.h>
  76#include <linux/phy.h>
  77#include <linux/jiffies.h>
  78#include <linux/preempt.h>
  79#include <net/route.h>
  80#include <net/net_namespace.h>
  81#include <net/netns/generic.h>
  82#include <net/pkt_sched.h>
  83#include <linux/rculist.h>
  84#include <net/flow_dissector.h>
  85#include <net/xfrm.h>
  86#include <net/bonding.h>
  87#include <net/bond_3ad.h>
  88#include <net/bond_alb.h>
  89#if IS_ENABLED(CONFIG_TLS_DEVICE)
  90#include <net/tls.h>
  91#endif
  92#include <net/ip6_route.h>
  93#include <net/xdp.h>
  94
  95#include "bonding_priv.h"
  96
  97/*---------------------------- Module parameters ----------------------------*/
  98
  99/* monitor all links that often (in milliseconds). <=0 disables monitoring */
 100
 101static int max_bonds	= BOND_DEFAULT_MAX_BONDS;
 102static int tx_queues	= BOND_DEFAULT_TX_QUEUES;
 103static int num_peer_notif = 1;
 104static int miimon;
 105static int updelay;
 106static int downdelay;
 107static int use_carrier	= 1;
 108static char *mode;
 109static char *primary;
 110static char *primary_reselect;
 111static char *lacp_rate;
 112static int min_links;
 113static char *ad_select;
 114static char *xmit_hash_policy;
 115static int arp_interval;
 116static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 117static char *arp_validate;
 118static char *arp_all_targets;
 119static char *fail_over_mac;
 120static int all_slaves_active;
 121static struct bond_params bonding_defaults;
 122static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 123static int packets_per_slave = 1;
 124static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
 125
 126module_param(max_bonds, int, 0);
 127MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 128module_param(tx_queues, int, 0);
 129MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 130module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 131MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 132			       "failover event (alias of num_unsol_na)");
 133module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 134MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 135			       "failover event (alias of num_grat_arp)");
 136module_param(miimon, int, 0);
 137MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 138module_param(updelay, int, 0);
 139MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 140module_param(downdelay, int, 0);
 141MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 142			    "in milliseconds");
 143module_param(use_carrier, int, 0);
 144MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 145			      "0 for off, 1 for on (default)");
 146module_param(mode, charp, 0);
 147MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 148		       "1 for active-backup, 2 for balance-xor, "
 149		       "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 150		       "6 for balance-alb");
 151module_param(primary, charp, 0);
 152MODULE_PARM_DESC(primary, "Primary network device to use");
 153module_param(primary_reselect, charp, 0);
 154MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 155				   "once it comes up; "
 156				   "0 for always (default), "
 157				   "1 for only if speed of primary is "
 158				   "better, "
 159				   "2 for only on active slave "
 160				   "failure");
 161module_param(lacp_rate, charp, 0);
 162MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 163			    "0 for slow, 1 for fast");
 164module_param(ad_select, charp, 0);
 165MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; "
 166			    "0 for stable (default), 1 for bandwidth, "
 167			    "2 for count");
 168module_param(min_links, int, 0);
 169MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 170
 171module_param(xmit_hash_policy, charp, 0);
 172MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; "
 173				   "0 for layer 2 (default), 1 for layer 3+4, "
 174				   "2 for layer 2+3, 3 for encap layer 2+3, "
 175				   "4 for encap layer 3+4, 5 for vlan+srcmac");
 176module_param(arp_interval, int, 0);
 177MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 178module_param_array(arp_ip_target, charp, NULL, 0);
 179MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 180module_param(arp_validate, charp, 0);
 181MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 182			       "0 for none (default), 1 for active, "
 183			       "2 for backup, 3 for all");
 184module_param(arp_all_targets, charp, 0);
 185MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
 186module_param(fail_over_mac, charp, 0);
 187MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 188				"the same MAC; 0 for none (default), "
 189				"1 for active, 2 for follow");
 190module_param(all_slaves_active, int, 0);
 191MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
 192				     "by setting active flag for all slaves; "
 193				     "0 for never (default), 1 for always.");
 194module_param(resend_igmp, int, 0);
 195MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 196			      "link failure");
 197module_param(packets_per_slave, int, 0);
 198MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
 199				    "mode; 0 for a random slave, 1 packet per "
 200				    "slave (default), >1 packets per slave.");
 201module_param(lp_interval, uint, 0);
 202MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
 203			      "the bonding driver sends learning packets to "
 204			      "each slaves peer switch. The default is 1.");
 205
 206/*----------------------------- Global variables ----------------------------*/
 207
 208#ifdef CONFIG_NET_POLL_CONTROLLER
 209atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 210#endif
 211
 212unsigned int bond_net_id __read_mostly;
 213
 214static const struct flow_dissector_key flow_keys_bonding_keys[] = {
 215	{
 216		.key_id = FLOW_DISSECTOR_KEY_CONTROL,
 217		.offset = offsetof(struct flow_keys, control),
 218	},
 219	{
 220		.key_id = FLOW_DISSECTOR_KEY_BASIC,
 221		.offset = offsetof(struct flow_keys, basic),
 222	},
 223	{
 224		.key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
 225		.offset = offsetof(struct flow_keys, addrs.v4addrs),
 226	},
 227	{
 228		.key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
 229		.offset = offsetof(struct flow_keys, addrs.v6addrs),
 230	},
 231	{
 232		.key_id = FLOW_DISSECTOR_KEY_TIPC,
 233		.offset = offsetof(struct flow_keys, addrs.tipckey),
 234	},
 235	{
 236		.key_id = FLOW_DISSECTOR_KEY_PORTS,
 237		.offset = offsetof(struct flow_keys, ports),
 238	},
 239	{
 240		.key_id = FLOW_DISSECTOR_KEY_ICMP,
 241		.offset = offsetof(struct flow_keys, icmp),
 242	},
 243	{
 244		.key_id = FLOW_DISSECTOR_KEY_VLAN,
 245		.offset = offsetof(struct flow_keys, vlan),
 246	},
 247	{
 248		.key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
 249		.offset = offsetof(struct flow_keys, tags),
 250	},
 251	{
 252		.key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
 253		.offset = offsetof(struct flow_keys, keyid),
 254	},
 255};
 256
 257static struct flow_dissector flow_keys_bonding __read_mostly;
 258
 259/*-------------------------- Forward declarations ---------------------------*/
 260
 261static int bond_init(struct net_device *bond_dev);
 262static void bond_uninit(struct net_device *bond_dev);
 263static void bond_get_stats(struct net_device *bond_dev,
 264			   struct rtnl_link_stats64 *stats);
 265static void bond_slave_arr_handler(struct work_struct *work);
 266static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
 267				  int mod);
 268static void bond_netdev_notify_work(struct work_struct *work);
 269
 270/*---------------------------- General routines -----------------------------*/
 271
 272const char *bond_mode_name(int mode)
 273{
 274	static const char *names[] = {
 275		[BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 276		[BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 277		[BOND_MODE_XOR] = "load balancing (xor)",
 278		[BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 279		[BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 280		[BOND_MODE_TLB] = "transmit load balancing",
 281		[BOND_MODE_ALB] = "adaptive load balancing",
 282	};
 283
 284	if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
 285		return "unknown";
 286
 287	return names[mode];
 288}
 289
 290/**
 291 * bond_dev_queue_xmit - Prepare skb for xmit.
 292 *
 293 * @bond: bond device that got this skb for tx.
 294 * @skb: hw accel VLAN tagged skb to transmit
 295 * @slave_dev: slave that is supposed to xmit this skbuff
 296 */
 297netdev_tx_t bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 298			struct net_device *slave_dev)
 299{
 300	skb->dev = slave_dev;
 301
 302	BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 303		     sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 304	skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
 305
 306	if (unlikely(netpoll_tx_running(bond->dev)))
 307		return bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 308
 309	return dev_queue_xmit(skb);
 310}
 311
 312static bool bond_sk_check(struct bonding *bond)
 313{
 314	switch (BOND_MODE(bond)) {
 315	case BOND_MODE_8023AD:
 316	case BOND_MODE_XOR:
 317		if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
 318			return true;
 319		fallthrough;
 320	default:
 321		return false;
 322	}
 323}
 324
 325static bool bond_xdp_check(struct bonding *bond)
 326{
 327	switch (BOND_MODE(bond)) {
 328	case BOND_MODE_ROUNDROBIN:
 329	case BOND_MODE_ACTIVEBACKUP:
 330		return true;
 331	case BOND_MODE_8023AD:
 332	case BOND_MODE_XOR:
 333		/* vlan+srcmac is not supported with XDP as in most cases the 802.1q
 334		 * payload is not in the packet due to hardware offload.
 335		 */
 336		if (bond->params.xmit_policy != BOND_XMIT_POLICY_VLAN_SRCMAC)
 337			return true;
 338		fallthrough;
 339	default:
 340		return false;
 341	}
 342}
 343
 344/*---------------------------------- VLAN -----------------------------------*/
 345
 346/* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 347 * We don't protect the slave list iteration with a lock because:
 348 * a. This operation is performed in IOCTL context,
 349 * b. The operation is protected by the RTNL semaphore in the 8021q code,
 350 * c. Holding a lock with BH disabled while directly calling a base driver
 351 *    entry point is generally a BAD idea.
 352 *
 353 * The design of synchronization/protection for this operation in the 8021q
 354 * module is good for one or more VLAN devices over a single physical device
 355 * and cannot be extended for a teaming solution like bonding, so there is a
 356 * potential race condition here where a net device from the vlan group might
 357 * be referenced (either by a base driver or the 8021q code) while it is being
 358 * removed from the system. However, it turns out we're not making matters
 359 * worse, and if it works for regular VLAN usage it will work here too.
 360*/
 361
 362/**
 363 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 364 * @bond_dev: bonding net device that got called
 365 * @proto: network protocol ID
 366 * @vid: vlan id being added
 367 */
 368static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
 369				__be16 proto, u16 vid)
 370{
 371	struct bonding *bond = netdev_priv(bond_dev);
 372	struct slave *slave, *rollback_slave;
 373	struct list_head *iter;
 374	int res;
 375
 376	bond_for_each_slave(bond, slave, iter) {
 377		res = vlan_vid_add(slave->dev, proto, vid);
 378		if (res)
 379			goto unwind;
 380	}
 381
 382	return 0;
 383
 384unwind:
 385	/* unwind to the slave that failed */
 386	bond_for_each_slave(bond, rollback_slave, iter) {
 387		if (rollback_slave == slave)
 388			break;
 389
 390		vlan_vid_del(rollback_slave->dev, proto, vid);
 391	}
 392
 393	return res;
 394}
 395
 396/**
 397 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 398 * @bond_dev: bonding net device that got called
 399 * @proto: network protocol ID
 400 * @vid: vlan id being removed
 401 */
 402static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 403				 __be16 proto, u16 vid)
 404{
 405	struct bonding *bond = netdev_priv(bond_dev);
 406	struct list_head *iter;
 407	struct slave *slave;
 408
 409	bond_for_each_slave(bond, slave, iter)
 410		vlan_vid_del(slave->dev, proto, vid);
 411
 412	if (bond_is_lb(bond))
 413		bond_alb_clear_vlan(bond, vid);
 414
 415	return 0;
 416}
 417
 418/*---------------------------------- XFRM -----------------------------------*/
 419
 420#ifdef CONFIG_XFRM_OFFLOAD
 421/**
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 422 * bond_ipsec_add_sa - program device with a security association
 423 * @xs: pointer to transformer state struct
 424 * @extack: extack point to fill failure reason
 425 **/
 426static int bond_ipsec_add_sa(struct xfrm_state *xs,
 427			     struct netlink_ext_ack *extack)
 428{
 429	struct net_device *bond_dev = xs->xso.dev;
 
 
 430	struct bond_ipsec *ipsec;
 431	struct bonding *bond;
 432	struct slave *slave;
 433	int err;
 434
 435	if (!bond_dev)
 436		return -EINVAL;
 437
 438	rcu_read_lock();
 439	bond = netdev_priv(bond_dev);
 440	slave = rcu_dereference(bond->curr_active_slave);
 441	if (!slave) {
 442		rcu_read_unlock();
 443		return -ENODEV;
 
 
 
 444	}
 445
 446	if (!slave->dev->xfrmdev_ops ||
 447	    !slave->dev->xfrmdev_ops->xdo_dev_state_add ||
 448	    netif_is_bond_master(slave->dev)) {
 449		NL_SET_ERR_MSG_MOD(extack, "Slave does not support ipsec offload");
 450		rcu_read_unlock();
 451		return -EINVAL;
 452	}
 453
 454	ipsec = kmalloc(sizeof(*ipsec), GFP_ATOMIC);
 455	if (!ipsec) {
 456		rcu_read_unlock();
 457		return -ENOMEM;
 458	}
 459	xs->xso.real_dev = slave->dev;
 460
 461	err = slave->dev->xfrmdev_ops->xdo_dev_state_add(xs, extack);
 
 462	if (!err) {
 463		ipsec->xs = xs;
 464		INIT_LIST_HEAD(&ipsec->list);
 465		spin_lock_bh(&bond->ipsec_lock);
 466		list_add(&ipsec->list, &bond->ipsec_list);
 467		spin_unlock_bh(&bond->ipsec_lock);
 468	} else {
 469		kfree(ipsec);
 470	}
 471	rcu_read_unlock();
 
 472	return err;
 473}
 474
 475static void bond_ipsec_add_sa_all(struct bonding *bond)
 476{
 477	struct net_device *bond_dev = bond->dev;
 
 478	struct bond_ipsec *ipsec;
 479	struct slave *slave;
 480
 481	rcu_read_lock();
 482	slave = rcu_dereference(bond->curr_active_slave);
 483	if (!slave)
 484		goto out;
 485
 486	if (!slave->dev->xfrmdev_ops ||
 487	    !slave->dev->xfrmdev_ops->xdo_dev_state_add ||
 488	    netif_is_bond_master(slave->dev)) {
 489		spin_lock_bh(&bond->ipsec_lock);
 490		if (!list_empty(&bond->ipsec_list))
 491			slave_warn(bond_dev, slave->dev,
 492				   "%s: no slave xdo_dev_state_add\n",
 493				   __func__);
 494		spin_unlock_bh(&bond->ipsec_lock);
 495		goto out;
 496	}
 497
 498	spin_lock_bh(&bond->ipsec_lock);
 499	list_for_each_entry(ipsec, &bond->ipsec_list, list) {
 500		ipsec->xs->xso.real_dev = slave->dev;
 501		if (slave->dev->xfrmdev_ops->xdo_dev_state_add(ipsec->xs, NULL)) {
 502			slave_warn(bond_dev, slave->dev, "%s: failed to add SA\n", __func__);
 
 
 
 
 503			ipsec->xs->xso.real_dev = NULL;
 504		}
 505	}
 506	spin_unlock_bh(&bond->ipsec_lock);
 507out:
 508	rcu_read_unlock();
 509}
 510
 511/**
 512 * bond_ipsec_del_sa - clear out this specific SA
 513 * @xs: pointer to transformer state struct
 514 **/
 515static void bond_ipsec_del_sa(struct xfrm_state *xs)
 516{
 517	struct net_device *bond_dev = xs->xso.dev;
 
 
 518	struct bond_ipsec *ipsec;
 519	struct bonding *bond;
 520	struct slave *slave;
 521
 522	if (!bond_dev)
 523		return;
 524
 525	rcu_read_lock();
 526	bond = netdev_priv(bond_dev);
 527	slave = rcu_dereference(bond->curr_active_slave);
 
 
 
 528
 529	if (!slave)
 530		goto out;
 531
 532	if (!xs->xso.real_dev)
 533		goto out;
 534
 535	WARN_ON(xs->xso.real_dev != slave->dev);
 536
 537	if (!slave->dev->xfrmdev_ops ||
 538	    !slave->dev->xfrmdev_ops->xdo_dev_state_delete ||
 539	    netif_is_bond_master(slave->dev)) {
 540		slave_warn(bond_dev, slave->dev, "%s: no slave xdo_dev_state_delete\n", __func__);
 541		goto out;
 542	}
 543
 544	slave->dev->xfrmdev_ops->xdo_dev_state_delete(xs);
 545out:
 546	spin_lock_bh(&bond->ipsec_lock);
 
 547	list_for_each_entry(ipsec, &bond->ipsec_list, list) {
 548		if (ipsec->xs == xs) {
 549			list_del(&ipsec->list);
 550			kfree(ipsec);
 551			break;
 552		}
 553	}
 554	spin_unlock_bh(&bond->ipsec_lock);
 555	rcu_read_unlock();
 556}
 557
 558static void bond_ipsec_del_sa_all(struct bonding *bond)
 559{
 560	struct net_device *bond_dev = bond->dev;
 
 561	struct bond_ipsec *ipsec;
 562	struct slave *slave;
 563
 564	rcu_read_lock();
 565	slave = rcu_dereference(bond->curr_active_slave);
 566	if (!slave) {
 567		rcu_read_unlock();
 568		return;
 569	}
 570
 571	spin_lock_bh(&bond->ipsec_lock);
 572	list_for_each_entry(ipsec, &bond->ipsec_list, list) {
 573		if (!ipsec->xs->xso.real_dev)
 574			continue;
 575
 576		if (!slave->dev->xfrmdev_ops ||
 577		    !slave->dev->xfrmdev_ops->xdo_dev_state_delete ||
 578		    netif_is_bond_master(slave->dev)) {
 579			slave_warn(bond_dev, slave->dev,
 580				   "%s: no slave xdo_dev_state_delete\n",
 581				   __func__);
 582		} else {
 583			slave->dev->xfrmdev_ops->xdo_dev_state_delete(ipsec->xs);
 
 
 584		}
 585		ipsec->xs->xso.real_dev = NULL;
 586	}
 587	spin_unlock_bh(&bond->ipsec_lock);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 588	rcu_read_unlock();
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 589}
 590
 591/**
 592 * bond_ipsec_offload_ok - can this packet use the xfrm hw offload
 593 * @skb: current data packet
 594 * @xs: pointer to transformer state struct
 595 **/
 596static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
 597{
 598	struct net_device *bond_dev = xs->xso.dev;
 599	struct net_device *real_dev;
 600	struct slave *curr_active;
 601	struct bonding *bond;
 602	int err;
 603
 604	bond = netdev_priv(bond_dev);
 605	rcu_read_lock();
 606	curr_active = rcu_dereference(bond->curr_active_slave);
 607	real_dev = curr_active->dev;
 
 608
 609	if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
 610		err = false;
 
 611		goto out;
 612	}
 613
 614	if (!xs->xso.real_dev) {
 615		err = false;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 616		goto out;
 617	}
 618
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 619	if (!real_dev->xfrmdev_ops ||
 620	    !real_dev->xfrmdev_ops->xdo_dev_offload_ok ||
 621	    netif_is_bond_master(real_dev)) {
 622		err = false;
 623		goto out;
 624	}
 625
 626	err = real_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs);
 627out:
 628	rcu_read_unlock();
 629	return err;
 630}
 631
 632static const struct xfrmdev_ops bond_xfrmdev_ops = {
 633	.xdo_dev_state_add = bond_ipsec_add_sa,
 634	.xdo_dev_state_delete = bond_ipsec_del_sa,
 
 635	.xdo_dev_offload_ok = bond_ipsec_offload_ok,
 
 
 636};
 637#endif /* CONFIG_XFRM_OFFLOAD */
 638
 639/*------------------------------- Link status -------------------------------*/
 640
 641/* Set the carrier state for the master according to the state of its
 642 * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 643 * do special 802.3ad magic.
 644 *
 645 * Returns zero if carrier state does not change, nonzero if it does.
 646 */
 647int bond_set_carrier(struct bonding *bond)
 648{
 649	struct list_head *iter;
 650	struct slave *slave;
 651
 652	if (!bond_has_slaves(bond))
 653		goto down;
 654
 655	if (BOND_MODE(bond) == BOND_MODE_8023AD)
 656		return bond_3ad_set_carrier(bond);
 657
 658	bond_for_each_slave(bond, slave, iter) {
 659		if (slave->link == BOND_LINK_UP) {
 660			if (!netif_carrier_ok(bond->dev)) {
 661				netif_carrier_on(bond->dev);
 662				return 1;
 663			}
 664			return 0;
 665		}
 666	}
 667
 668down:
 669	if (netif_carrier_ok(bond->dev)) {
 670		netif_carrier_off(bond->dev);
 671		return 1;
 672	}
 673	return 0;
 674}
 675
 676/* Get link speed and duplex from the slave's base driver
 677 * using ethtool. If for some reason the call fails or the
 678 * values are invalid, set speed and duplex to -1,
 679 * and return. Return 1 if speed or duplex settings are
 680 * UNKNOWN; 0 otherwise.
 681 */
 682static int bond_update_speed_duplex(struct slave *slave)
 683{
 684	struct net_device *slave_dev = slave->dev;
 685	struct ethtool_link_ksettings ecmd;
 686	int res;
 687
 688	slave->speed = SPEED_UNKNOWN;
 689	slave->duplex = DUPLEX_UNKNOWN;
 690
 691	res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
 692	if (res < 0)
 693		return 1;
 694	if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
 695		return 1;
 696	switch (ecmd.base.duplex) {
 697	case DUPLEX_FULL:
 698	case DUPLEX_HALF:
 699		break;
 700	default:
 701		return 1;
 702	}
 703
 704	slave->speed = ecmd.base.speed;
 705	slave->duplex = ecmd.base.duplex;
 706
 707	return 0;
 708}
 709
 710const char *bond_slave_link_status(s8 link)
 711{
 712	switch (link) {
 713	case BOND_LINK_UP:
 714		return "up";
 715	case BOND_LINK_FAIL:
 716		return "going down";
 717	case BOND_LINK_DOWN:
 718		return "down";
 719	case BOND_LINK_BACK:
 720		return "going back";
 721	default:
 722		return "unknown";
 723	}
 724}
 725
 726/* if <dev> supports MII link status reporting, check its link status.
 727 *
 728 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 729 * depending upon the setting of the use_carrier parameter.
 730 *
 731 * Return either BMSR_LSTATUS, meaning that the link is up (or we
 732 * can't tell and just pretend it is), or 0, meaning that the link is
 733 * down.
 734 *
 735 * If reporting is non-zero, instead of faking link up, return -1 if
 736 * both ETHTOOL and MII ioctls fail (meaning the device does not
 737 * support them).  If use_carrier is set, return whatever it says.
 738 * It'd be nice if there was a good way to tell if a driver supports
 739 * netif_carrier, but there really isn't.
 740 */
 741static int bond_check_dev_link(struct bonding *bond,
 742			       struct net_device *slave_dev, int reporting)
 743{
 744	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 745	int (*ioctl)(struct net_device *, struct ifreq *, int);
 746	struct ifreq ifr;
 747	struct mii_ioctl_data *mii;
 748
 749	if (!reporting && !netif_running(slave_dev))
 750		return 0;
 751
 752	if (bond->params.use_carrier)
 753		return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 754
 755	/* Try to get link status using Ethtool first. */
 756	if (slave_dev->ethtool_ops->get_link)
 757		return slave_dev->ethtool_ops->get_link(slave_dev) ?
 758			BMSR_LSTATUS : 0;
 759
 760	/* Ethtool can't be used, fallback to MII ioctls. */
 761	ioctl = slave_ops->ndo_eth_ioctl;
 762	if (ioctl) {
 763		/* TODO: set pointer to correct ioctl on a per team member
 764		 *       bases to make this more efficient. that is, once
 765		 *       we determine the correct ioctl, we will always
 766		 *       call it and not the others for that team
 767		 *       member.
 768		 */
 769
 770		/* We cannot assume that SIOCGMIIPHY will also read a
 771		 * register; not all network drivers (e.g., e100)
 772		 * support that.
 773		 */
 774
 775		/* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 776		strscpy_pad(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 777		mii = if_mii(&ifr);
 778		if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 779			mii->reg_num = MII_BMSR;
 780			if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
 781				return mii->val_out & BMSR_LSTATUS;
 782		}
 783	}
 784
 785	/* If reporting, report that either there's no ndo_eth_ioctl,
 786	 * or both SIOCGMIIREG and get_link failed (meaning that we
 787	 * cannot report link status).  If not reporting, pretend
 788	 * we're ok.
 789	 */
 790	return reporting ? -1 : BMSR_LSTATUS;
 791}
 792
 793/*----------------------------- Multicast list ------------------------------*/
 794
 795/* Push the promiscuity flag down to appropriate slaves */
 796static int bond_set_promiscuity(struct bonding *bond, int inc)
 797{
 798	struct list_head *iter;
 799	int err = 0;
 800
 801	if (bond_uses_primary(bond)) {
 802		struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 803
 804		if (curr_active)
 805			err = dev_set_promiscuity(curr_active->dev, inc);
 806	} else {
 807		struct slave *slave;
 808
 809		bond_for_each_slave(bond, slave, iter) {
 810			err = dev_set_promiscuity(slave->dev, inc);
 811			if (err)
 812				return err;
 813		}
 814	}
 815	return err;
 816}
 817
 818/* Push the allmulti flag down to all slaves */
 819static int bond_set_allmulti(struct bonding *bond, int inc)
 820{
 821	struct list_head *iter;
 822	int err = 0;
 823
 824	if (bond_uses_primary(bond)) {
 825		struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 826
 827		if (curr_active)
 828			err = dev_set_allmulti(curr_active->dev, inc);
 829	} else {
 830		struct slave *slave;
 831
 832		bond_for_each_slave(bond, slave, iter) {
 833			err = dev_set_allmulti(slave->dev, inc);
 834			if (err)
 835				return err;
 836		}
 837	}
 838	return err;
 839}
 840
 841/* Retrieve the list of registered multicast addresses for the bonding
 842 * device and retransmit an IGMP JOIN request to the current active
 843 * slave.
 844 */
 845static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 846{
 847	struct bonding *bond = container_of(work, struct bonding,
 848					    mcast_work.work);
 849
 850	if (!rtnl_trylock()) {
 851		queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 852		return;
 853	}
 854	call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
 855
 856	if (bond->igmp_retrans > 1) {
 857		bond->igmp_retrans--;
 858		queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 859	}
 860	rtnl_unlock();
 861}
 862
 863/* Flush bond's hardware addresses from slave */
 864static void bond_hw_addr_flush(struct net_device *bond_dev,
 865			       struct net_device *slave_dev)
 866{
 867	struct bonding *bond = netdev_priv(bond_dev);
 868
 869	dev_uc_unsync(slave_dev, bond_dev);
 870	dev_mc_unsync(slave_dev, bond_dev);
 871
 872	if (BOND_MODE(bond) == BOND_MODE_8023AD)
 873		dev_mc_del(slave_dev, lacpdu_mcast_addr);
 874}
 875
 876/*--------------------------- Active slave change ---------------------------*/
 877
 878/* Update the hardware address list and promisc/allmulti for the new and
 879 * old active slaves (if any).  Modes that are not using primary keep all
 880 * slaves up date at all times; only the modes that use primary need to call
 881 * this function to swap these settings during a failover.
 882 */
 883static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
 884			      struct slave *old_active)
 885{
 886	if (old_active) {
 887		if (bond->dev->flags & IFF_PROMISC)
 888			dev_set_promiscuity(old_active->dev, -1);
 889
 890		if (bond->dev->flags & IFF_ALLMULTI)
 891			dev_set_allmulti(old_active->dev, -1);
 892
 893		if (bond->dev->flags & IFF_UP)
 894			bond_hw_addr_flush(bond->dev, old_active->dev);
 
 
 895	}
 896
 897	if (new_active) {
 898		/* FIXME: Signal errors upstream. */
 899		if (bond->dev->flags & IFF_PROMISC)
 900			dev_set_promiscuity(new_active->dev, 1);
 901
 902		if (bond->dev->flags & IFF_ALLMULTI)
 903			dev_set_allmulti(new_active->dev, 1);
 904
 905		if (bond->dev->flags & IFF_UP) {
 906			netif_addr_lock_bh(bond->dev);
 907			dev_uc_sync(new_active->dev, bond->dev);
 908			dev_mc_sync(new_active->dev, bond->dev);
 909			netif_addr_unlock_bh(bond->dev);
 910		}
 
 
 911	}
 912}
 913
 914/**
 915 * bond_set_dev_addr - clone slave's address to bond
 916 * @bond_dev: bond net device
 917 * @slave_dev: slave net device
 918 *
 919 * Should be called with RTNL held.
 920 */
 921static int bond_set_dev_addr(struct net_device *bond_dev,
 922			     struct net_device *slave_dev)
 923{
 924	int err;
 925
 926	slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
 927		  bond_dev, slave_dev, slave_dev->addr_len);
 928	err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL);
 929	if (err)
 930		return err;
 931
 932	__dev_addr_set(bond_dev, slave_dev->dev_addr, slave_dev->addr_len);
 933	bond_dev->addr_assign_type = NET_ADDR_STOLEN;
 934	call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
 935	return 0;
 936}
 937
 938static struct slave *bond_get_old_active(struct bonding *bond,
 939					 struct slave *new_active)
 940{
 941	struct slave *slave;
 942	struct list_head *iter;
 943
 944	bond_for_each_slave(bond, slave, iter) {
 945		if (slave == new_active)
 946			continue;
 947
 948		if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
 949			return slave;
 950	}
 951
 952	return NULL;
 953}
 954
 955/* bond_do_fail_over_mac
 956 *
 957 * Perform special MAC address swapping for fail_over_mac settings
 958 *
 959 * Called with RTNL
 960 */
 961static void bond_do_fail_over_mac(struct bonding *bond,
 962				  struct slave *new_active,
 963				  struct slave *old_active)
 964{
 965	u8 tmp_mac[MAX_ADDR_LEN];
 966	struct sockaddr_storage ss;
 967	int rv;
 968
 969	switch (bond->params.fail_over_mac) {
 970	case BOND_FOM_ACTIVE:
 971		if (new_active) {
 972			rv = bond_set_dev_addr(bond->dev, new_active->dev);
 973			if (rv)
 974				slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n",
 975					  -rv);
 976		}
 977		break;
 978	case BOND_FOM_FOLLOW:
 979		/* if new_active && old_active, swap them
 980		 * if just old_active, do nothing (going to no active slave)
 981		 * if just new_active, set new_active to bond's MAC
 982		 */
 983		if (!new_active)
 984			return;
 985
 986		if (!old_active)
 987			old_active = bond_get_old_active(bond, new_active);
 988
 989		if (old_active) {
 990			bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr,
 991					  new_active->dev->addr_len);
 992			bond_hw_addr_copy(ss.__data,
 993					  old_active->dev->dev_addr,
 994					  old_active->dev->addr_len);
 995			ss.ss_family = new_active->dev->type;
 996		} else {
 997			bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
 998					  bond->dev->addr_len);
 999			ss.ss_family = bond->dev->type;
1000		}
1001
1002		rv = dev_set_mac_address(new_active->dev,
1003					 (struct sockaddr *)&ss, NULL);
1004		if (rv) {
1005			slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n",
1006				  -rv);
1007			goto out;
1008		}
1009
1010		if (!old_active)
1011			goto out;
1012
1013		bond_hw_addr_copy(ss.__data, tmp_mac,
1014				  new_active->dev->addr_len);
1015		ss.ss_family = old_active->dev->type;
1016
1017		rv = dev_set_mac_address(old_active->dev,
1018					 (struct sockaddr *)&ss, NULL);
1019		if (rv)
1020			slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n",
1021				  -rv);
1022out:
1023		break;
1024	default:
1025		netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
1026			   bond->params.fail_over_mac);
1027		break;
1028	}
1029
1030}
1031
1032/**
1033 * bond_choose_primary_or_current - select the primary or high priority slave
1034 * @bond: our bonding struct
1035 *
1036 * - Check if there is a primary link. If the primary link was set and is up,
1037 *   go on and do link reselection.
1038 *
1039 * - If primary link is not set or down, find the highest priority link.
1040 *   If the highest priority link is not current slave, set it as primary
1041 *   link and do link reselection.
1042 */
1043static struct slave *bond_choose_primary_or_current(struct bonding *bond)
1044{
1045	struct slave *prim = rtnl_dereference(bond->primary_slave);
1046	struct slave *curr = rtnl_dereference(bond->curr_active_slave);
1047	struct slave *slave, *hprio = NULL;
1048	struct list_head *iter;
1049
1050	if (!prim || prim->link != BOND_LINK_UP) {
1051		bond_for_each_slave(bond, slave, iter) {
1052			if (slave->link == BOND_LINK_UP) {
1053				hprio = hprio ?: slave;
1054				if (slave->prio > hprio->prio)
1055					hprio = slave;
1056			}
1057		}
1058
1059		if (hprio && hprio != curr) {
1060			prim = hprio;
1061			goto link_reselect;
1062		}
1063
1064		if (!curr || curr->link != BOND_LINK_UP)
1065			return NULL;
1066		return curr;
1067	}
1068
1069	if (bond->force_primary) {
1070		bond->force_primary = false;
1071		return prim;
1072	}
1073
1074link_reselect:
1075	if (!curr || curr->link != BOND_LINK_UP)
1076		return prim;
1077
1078	/* At this point, prim and curr are both up */
1079	switch (bond->params.primary_reselect) {
1080	case BOND_PRI_RESELECT_ALWAYS:
1081		return prim;
1082	case BOND_PRI_RESELECT_BETTER:
1083		if (prim->speed < curr->speed)
1084			return curr;
1085		if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
1086			return curr;
1087		return prim;
1088	case BOND_PRI_RESELECT_FAILURE:
1089		return curr;
1090	default:
1091		netdev_err(bond->dev, "impossible primary_reselect %d\n",
1092			   bond->params.primary_reselect);
1093		return curr;
1094	}
1095}
1096
1097/**
1098 * bond_find_best_slave - select the best available slave to be the active one
1099 * @bond: our bonding struct
1100 */
1101static struct slave *bond_find_best_slave(struct bonding *bond)
1102{
1103	struct slave *slave, *bestslave = NULL;
1104	struct list_head *iter;
1105	int mintime = bond->params.updelay;
1106
1107	slave = bond_choose_primary_or_current(bond);
1108	if (slave)
1109		return slave;
1110
1111	bond_for_each_slave(bond, slave, iter) {
1112		if (slave->link == BOND_LINK_UP)
1113			return slave;
1114		if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
1115		    slave->delay < mintime) {
1116			mintime = slave->delay;
1117			bestslave = slave;
1118		}
1119	}
1120
1121	return bestslave;
1122}
1123
 
1124static bool bond_should_notify_peers(struct bonding *bond)
1125{
1126	struct slave *slave;
1127
1128	rcu_read_lock();
1129	slave = rcu_dereference(bond->curr_active_slave);
1130	rcu_read_unlock();
1131
1132	if (!slave || !bond->send_peer_notif ||
1133	    bond->send_peer_notif %
1134	    max(1, bond->params.peer_notif_delay) != 0 ||
1135	    !netif_carrier_ok(bond->dev) ||
1136	    test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
1137		return false;
1138
1139	netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
1140		   slave ? slave->dev->name : "NULL");
1141
1142	return true;
1143}
1144
1145/**
1146 * bond_change_active_slave - change the active slave into the specified one
1147 * @bond: our bonding struct
1148 * @new_active: the new slave to make the active one
1149 *
1150 * Set the new slave to the bond's settings and unset them on the old
1151 * curr_active_slave.
1152 * Setting include flags, mc-list, promiscuity, allmulti, etc.
1153 *
1154 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1155 * because it is apparently the best available slave we have, even though its
1156 * updelay hasn't timed out yet.
1157 *
1158 * Caller must hold RTNL.
1159 */
1160void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1161{
1162	struct slave *old_active;
1163
1164	ASSERT_RTNL();
1165
1166	old_active = rtnl_dereference(bond->curr_active_slave);
1167
1168	if (old_active == new_active)
1169		return;
1170
1171#ifdef CONFIG_XFRM_OFFLOAD
1172	bond_ipsec_del_sa_all(bond);
1173#endif /* CONFIG_XFRM_OFFLOAD */
1174
1175	if (new_active) {
1176		new_active->last_link_up = jiffies;
1177
1178		if (new_active->link == BOND_LINK_BACK) {
1179			if (bond_uses_primary(bond)) {
1180				slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n",
1181					   (bond->params.updelay - new_active->delay) * bond->params.miimon);
1182			}
1183
1184			new_active->delay = 0;
1185			bond_set_slave_link_state(new_active, BOND_LINK_UP,
1186						  BOND_SLAVE_NOTIFY_NOW);
1187
1188			if (BOND_MODE(bond) == BOND_MODE_8023AD)
1189				bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1190
1191			if (bond_is_lb(bond))
1192				bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1193		} else {
1194			if (bond_uses_primary(bond))
1195				slave_info(bond->dev, new_active->dev, "making interface the new active one\n");
1196		}
1197	}
1198
1199	if (bond_uses_primary(bond))
1200		bond_hw_addr_swap(bond, new_active, old_active);
1201
1202	if (bond_is_lb(bond)) {
1203		bond_alb_handle_active_change(bond, new_active);
1204		if (old_active)
1205			bond_set_slave_inactive_flags(old_active,
1206						      BOND_SLAVE_NOTIFY_NOW);
1207		if (new_active)
1208			bond_set_slave_active_flags(new_active,
1209						    BOND_SLAVE_NOTIFY_NOW);
1210	} else {
1211		rcu_assign_pointer(bond->curr_active_slave, new_active);
1212	}
1213
1214	if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
1215		if (old_active)
1216			bond_set_slave_inactive_flags(old_active,
1217						      BOND_SLAVE_NOTIFY_NOW);
1218
1219		if (new_active) {
1220			bool should_notify_peers = false;
1221
1222			bond_set_slave_active_flags(new_active,
1223						    BOND_SLAVE_NOTIFY_NOW);
1224
1225			if (bond->params.fail_over_mac)
1226				bond_do_fail_over_mac(bond, new_active,
1227						      old_active);
1228
1229			if (netif_running(bond->dev)) {
1230				bond->send_peer_notif =
1231					bond->params.num_peer_notif *
1232					max(1, bond->params.peer_notif_delay);
1233				should_notify_peers =
1234					bond_should_notify_peers(bond);
1235			}
1236
1237			call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
1238			if (should_notify_peers) {
1239				bond->send_peer_notif--;
1240				call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
1241							 bond->dev);
1242			}
1243		}
1244	}
1245
1246#ifdef CONFIG_XFRM_OFFLOAD
1247	bond_ipsec_add_sa_all(bond);
1248#endif /* CONFIG_XFRM_OFFLOAD */
1249
1250	/* resend IGMP joins since active slave has changed or
1251	 * all were sent on curr_active_slave.
1252	 * resend only if bond is brought up with the affected
1253	 * bonding modes and the retransmission is enabled
1254	 */
1255	if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1256	    ((bond_uses_primary(bond) && new_active) ||
1257	     BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
1258		bond->igmp_retrans = bond->params.resend_igmp;
1259		queue_delayed_work(bond->wq, &bond->mcast_work, 1);
1260	}
1261}
1262
1263/**
1264 * bond_select_active_slave - select a new active slave, if needed
1265 * @bond: our bonding struct
1266 *
1267 * This functions should be called when one of the following occurs:
1268 * - The old curr_active_slave has been released or lost its link.
1269 * - The primary_slave has got its link back.
1270 * - A slave has got its link back and there's no old curr_active_slave.
1271 *
1272 * Caller must hold RTNL.
1273 */
1274void bond_select_active_slave(struct bonding *bond)
1275{
1276	struct slave *best_slave;
1277	int rv;
1278
1279	ASSERT_RTNL();
1280
1281	best_slave = bond_find_best_slave(bond);
1282	if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
1283		bond_change_active_slave(bond, best_slave);
1284		rv = bond_set_carrier(bond);
1285		if (!rv)
1286			return;
1287
1288		if (netif_carrier_ok(bond->dev))
1289			netdev_info(bond->dev, "active interface up!\n");
1290		else
1291			netdev_info(bond->dev, "now running without any active interface!\n");
1292	}
1293}
1294
1295#ifdef CONFIG_NET_POLL_CONTROLLER
1296static inline int slave_enable_netpoll(struct slave *slave)
1297{
1298	struct netpoll *np;
1299	int err = 0;
1300
1301	np = kzalloc(sizeof(*np), GFP_KERNEL);
1302	err = -ENOMEM;
1303	if (!np)
1304		goto out;
1305
1306	err = __netpoll_setup(np, slave->dev);
1307	if (err) {
1308		kfree(np);
1309		goto out;
1310	}
1311	slave->np = np;
1312out:
1313	return err;
1314}
1315static inline void slave_disable_netpoll(struct slave *slave)
1316{
1317	struct netpoll *np = slave->np;
1318
1319	if (!np)
1320		return;
1321
1322	slave->np = NULL;
1323
1324	__netpoll_free(np);
1325}
1326
1327static void bond_poll_controller(struct net_device *bond_dev)
1328{
1329	struct bonding *bond = netdev_priv(bond_dev);
1330	struct slave *slave = NULL;
1331	struct list_head *iter;
1332	struct ad_info ad_info;
1333
1334	if (BOND_MODE(bond) == BOND_MODE_8023AD)
1335		if (bond_3ad_get_active_agg_info(bond, &ad_info))
1336			return;
1337
1338	bond_for_each_slave_rcu(bond, slave, iter) {
1339		if (!bond_slave_is_up(slave))
1340			continue;
1341
1342		if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1343			struct aggregator *agg =
1344			    SLAVE_AD_INFO(slave)->port.aggregator;
1345
1346			if (agg &&
1347			    agg->aggregator_identifier != ad_info.aggregator_id)
1348				continue;
1349		}
1350
1351		netpoll_poll_dev(slave->dev);
1352	}
1353}
1354
1355static void bond_netpoll_cleanup(struct net_device *bond_dev)
1356{
1357	struct bonding *bond = netdev_priv(bond_dev);
1358	struct list_head *iter;
1359	struct slave *slave;
1360
1361	bond_for_each_slave(bond, slave, iter)
1362		if (bond_slave_is_up(slave))
1363			slave_disable_netpoll(slave);
1364}
1365
1366static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1367{
1368	struct bonding *bond = netdev_priv(dev);
1369	struct list_head *iter;
1370	struct slave *slave;
1371	int err = 0;
1372
1373	bond_for_each_slave(bond, slave, iter) {
1374		err = slave_enable_netpoll(slave);
1375		if (err) {
1376			bond_netpoll_cleanup(dev);
1377			break;
1378		}
1379	}
1380	return err;
1381}
1382#else
1383static inline int slave_enable_netpoll(struct slave *slave)
1384{
1385	return 0;
1386}
1387static inline void slave_disable_netpoll(struct slave *slave)
1388{
1389}
1390static void bond_netpoll_cleanup(struct net_device *bond_dev)
1391{
1392}
1393#endif
1394
1395/*---------------------------------- IOCTL ----------------------------------*/
1396
1397static netdev_features_t bond_fix_features(struct net_device *dev,
1398					   netdev_features_t features)
1399{
1400	struct bonding *bond = netdev_priv(dev);
1401	struct list_head *iter;
1402	netdev_features_t mask;
1403	struct slave *slave;
1404
1405	mask = features;
1406
1407	features &= ~NETIF_F_ONE_FOR_ALL;
1408	features |= NETIF_F_ALL_FOR_ALL;
1409
1410	bond_for_each_slave(bond, slave, iter) {
1411		features = netdev_increment_features(features,
1412						     slave->dev->features,
1413						     mask);
1414	}
1415	features = netdev_add_tso_features(features, mask);
1416
1417	return features;
1418}
1419
1420#define BOND_VLAN_FEATURES	(NETIF_F_HW_CSUM | NETIF_F_SG | \
1421				 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | \
 
1422				 NETIF_F_HIGHDMA | NETIF_F_LRO)
1423
1424#define BOND_ENC_FEATURES	(NETIF_F_HW_CSUM | NETIF_F_SG | \
1425				 NETIF_F_RXCSUM | NETIF_F_GSO_SOFTWARE)
 
1426
1427#define BOND_MPLS_FEATURES	(NETIF_F_HW_CSUM | NETIF_F_SG | \
1428				 NETIF_F_GSO_SOFTWARE)
1429
 
 
1430
1431static void bond_compute_features(struct bonding *bond)
1432{
 
1433	unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1434					IFF_XMIT_DST_RELEASE_PERM;
1435	netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1436	netdev_features_t enc_features  = BOND_ENC_FEATURES;
1437#ifdef CONFIG_XFRM_OFFLOAD
1438	netdev_features_t xfrm_features  = BOND_XFRM_FEATURES;
1439#endif /* CONFIG_XFRM_OFFLOAD */
1440	netdev_features_t mpls_features  = BOND_MPLS_FEATURES;
1441	struct net_device *bond_dev = bond->dev;
1442	struct list_head *iter;
1443	struct slave *slave;
1444	unsigned short max_hard_header_len = ETH_HLEN;
1445	unsigned int tso_max_size = TSO_MAX_SIZE;
1446	u16 tso_max_segs = TSO_MAX_SEGS;
1447
1448	if (!bond_has_slaves(bond))
1449		goto done;
1450	vlan_features &= NETIF_F_ALL_FOR_ALL;
1451	mpls_features &= NETIF_F_ALL_FOR_ALL;
 
1452
1453	bond_for_each_slave(bond, slave, iter) {
1454		vlan_features = netdev_increment_features(vlan_features,
1455			slave->dev->vlan_features, BOND_VLAN_FEATURES);
1456
1457		enc_features = netdev_increment_features(enc_features,
1458							 slave->dev->hw_enc_features,
1459							 BOND_ENC_FEATURES);
1460
1461#ifdef CONFIG_XFRM_OFFLOAD
1462		xfrm_features = netdev_increment_features(xfrm_features,
1463							  slave->dev->hw_enc_features,
1464							  BOND_XFRM_FEATURES);
1465#endif /* CONFIG_XFRM_OFFLOAD */
1466
 
 
 
 
1467		mpls_features = netdev_increment_features(mpls_features,
1468							  slave->dev->mpls_features,
1469							  BOND_MPLS_FEATURES);
1470
1471		dst_release_flag &= slave->dev->priv_flags;
1472		if (slave->dev->hard_header_len > max_hard_header_len)
1473			max_hard_header_len = slave->dev->hard_header_len;
1474
1475		tso_max_size = min(tso_max_size, slave->dev->tso_max_size);
1476		tso_max_segs = min(tso_max_segs, slave->dev->tso_max_segs);
1477	}
1478	bond_dev->hard_header_len = max_hard_header_len;
1479
1480done:
 
1481	bond_dev->vlan_features = vlan_features;
1482	bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
1483				    NETIF_F_HW_VLAN_CTAG_TX |
1484				    NETIF_F_HW_VLAN_STAG_TX;
1485#ifdef CONFIG_XFRM_OFFLOAD
1486	bond_dev->hw_enc_features |= xfrm_features;
1487#endif /* CONFIG_XFRM_OFFLOAD */
1488	bond_dev->mpls_features = mpls_features;
1489	netif_set_tso_max_segs(bond_dev, tso_max_segs);
1490	netif_set_tso_max_size(bond_dev, tso_max_size);
1491
1492	bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1493	if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1494	    dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1495		bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1496
1497	netdev_change_features(bond_dev);
1498}
1499
1500static void bond_setup_by_slave(struct net_device *bond_dev,
1501				struct net_device *slave_dev)
1502{
1503	bool was_up = !!(bond_dev->flags & IFF_UP);
1504
1505	dev_close(bond_dev);
1506
1507	bond_dev->header_ops	    = slave_dev->header_ops;
1508
1509	bond_dev->type		    = slave_dev->type;
1510	bond_dev->hard_header_len   = slave_dev->hard_header_len;
1511	bond_dev->needed_headroom   = slave_dev->needed_headroom;
1512	bond_dev->addr_len	    = slave_dev->addr_len;
1513
1514	memcpy(bond_dev->broadcast, slave_dev->broadcast,
1515		slave_dev->addr_len);
1516
1517	if (slave_dev->flags & IFF_POINTOPOINT) {
1518		bond_dev->flags &= ~(IFF_BROADCAST | IFF_MULTICAST);
1519		bond_dev->flags |= (IFF_POINTOPOINT | IFF_NOARP);
1520	}
1521	if (was_up)
1522		dev_open(bond_dev, NULL);
1523}
1524
1525/* On bonding slaves other than the currently active slave, suppress
1526 * duplicates except for alb non-mcast/bcast.
1527 */
1528static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1529					    struct slave *slave,
1530					    struct bonding *bond)
1531{
1532	if (bond_is_slave_inactive(slave)) {
1533		if (BOND_MODE(bond) == BOND_MODE_ALB &&
1534		    skb->pkt_type != PACKET_BROADCAST &&
1535		    skb->pkt_type != PACKET_MULTICAST)
1536			return false;
1537		return true;
1538	}
1539	return false;
1540}
1541
1542static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1543{
1544	struct sk_buff *skb = *pskb;
1545	struct slave *slave;
1546	struct bonding *bond;
1547	int (*recv_probe)(const struct sk_buff *, struct bonding *,
1548			  struct slave *);
1549	int ret = RX_HANDLER_ANOTHER;
1550
1551	skb = skb_share_check(skb, GFP_ATOMIC);
1552	if (unlikely(!skb))
1553		return RX_HANDLER_CONSUMED;
1554
1555	*pskb = skb;
1556
1557	slave = bond_slave_get_rcu(skb->dev);
1558	bond = slave->bond;
1559
1560	recv_probe = READ_ONCE(bond->recv_probe);
1561	if (recv_probe) {
1562		ret = recv_probe(skb, bond, slave);
1563		if (ret == RX_HANDLER_CONSUMED) {
1564			consume_skb(skb);
1565			return ret;
1566		}
1567	}
1568
1569	/*
1570	 * For packets determined by bond_should_deliver_exact_match() call to
1571	 * be suppressed we want to make an exception for link-local packets.
1572	 * This is necessary for e.g. LLDP daemons to be able to monitor
1573	 * inactive slave links without being forced to bind to them
1574	 * explicitly.
1575	 *
1576	 * At the same time, packets that are passed to the bonding master
1577	 * (including link-local ones) can have their originating interface
1578	 * determined via PACKET_ORIGDEV socket option.
1579	 */
1580	if (bond_should_deliver_exact_match(skb, slave, bond)) {
1581		if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
1582			return RX_HANDLER_PASS;
1583		return RX_HANDLER_EXACT;
1584	}
1585
1586	skb->dev = bond->dev;
1587
1588	if (BOND_MODE(bond) == BOND_MODE_ALB &&
1589	    netif_is_bridge_port(bond->dev) &&
1590	    skb->pkt_type == PACKET_HOST) {
1591
1592		if (unlikely(skb_cow_head(skb,
1593					  skb->data - skb_mac_header(skb)))) {
1594			kfree_skb(skb);
1595			return RX_HANDLER_CONSUMED;
1596		}
1597		bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,
1598				  bond->dev->addr_len);
1599	}
1600
1601	return ret;
1602}
1603
1604static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1605{
1606	switch (BOND_MODE(bond)) {
1607	case BOND_MODE_ROUNDROBIN:
1608		return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1609	case BOND_MODE_ACTIVEBACKUP:
1610		return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1611	case BOND_MODE_BROADCAST:
1612		return NETDEV_LAG_TX_TYPE_BROADCAST;
1613	case BOND_MODE_XOR:
1614	case BOND_MODE_8023AD:
1615		return NETDEV_LAG_TX_TYPE_HASH;
1616	default:
1617		return NETDEV_LAG_TX_TYPE_UNKNOWN;
1618	}
1619}
1620
1621static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond,
1622					       enum netdev_lag_tx_type type)
1623{
1624	if (type != NETDEV_LAG_TX_TYPE_HASH)
1625		return NETDEV_LAG_HASH_NONE;
1626
1627	switch (bond->params.xmit_policy) {
1628	case BOND_XMIT_POLICY_LAYER2:
1629		return NETDEV_LAG_HASH_L2;
1630	case BOND_XMIT_POLICY_LAYER34:
1631		return NETDEV_LAG_HASH_L34;
1632	case BOND_XMIT_POLICY_LAYER23:
1633		return NETDEV_LAG_HASH_L23;
1634	case BOND_XMIT_POLICY_ENCAP23:
1635		return NETDEV_LAG_HASH_E23;
1636	case BOND_XMIT_POLICY_ENCAP34:
1637		return NETDEV_LAG_HASH_E34;
1638	case BOND_XMIT_POLICY_VLAN_SRCMAC:
1639		return NETDEV_LAG_HASH_VLAN_SRCMAC;
1640	default:
1641		return NETDEV_LAG_HASH_UNKNOWN;
1642	}
1643}
1644
1645static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave,
1646				      struct netlink_ext_ack *extack)
1647{
1648	struct netdev_lag_upper_info lag_upper_info;
1649	enum netdev_lag_tx_type type;
1650	int err;
1651
1652	type = bond_lag_tx_type(bond);
1653	lag_upper_info.tx_type = type;
1654	lag_upper_info.hash_type = bond_lag_hash_type(bond, type);
1655
1656	err = netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1657					   &lag_upper_info, extack);
1658	if (err)
1659		return err;
1660
1661	slave->dev->flags |= IFF_SLAVE;
1662	return 0;
1663}
1664
1665static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1666{
1667	netdev_upper_dev_unlink(slave->dev, bond->dev);
1668	slave->dev->flags &= ~IFF_SLAVE;
1669}
1670
1671static void slave_kobj_release(struct kobject *kobj)
1672{
1673	struct slave *slave = to_slave(kobj);
1674	struct bonding *bond = bond_get_bond_by_slave(slave);
1675
1676	cancel_delayed_work_sync(&slave->notify_work);
1677	if (BOND_MODE(bond) == BOND_MODE_8023AD)
1678		kfree(SLAVE_AD_INFO(slave));
1679
1680	kfree(slave);
1681}
1682
1683static struct kobj_type slave_ktype = {
1684	.release = slave_kobj_release,
1685#ifdef CONFIG_SYSFS
1686	.sysfs_ops = &slave_sysfs_ops,
1687#endif
1688};
1689
1690static int bond_kobj_init(struct slave *slave)
1691{
1692	int err;
1693
1694	err = kobject_init_and_add(&slave->kobj, &slave_ktype,
1695				   &(slave->dev->dev.kobj), "bonding_slave");
1696	if (err)
1697		kobject_put(&slave->kobj);
1698
1699	return err;
1700}
1701
1702static struct slave *bond_alloc_slave(struct bonding *bond,
1703				      struct net_device *slave_dev)
1704{
1705	struct slave *slave = NULL;
1706
1707	slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1708	if (!slave)
1709		return NULL;
1710
1711	slave->bond = bond;
1712	slave->dev = slave_dev;
1713	INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work);
1714
1715	if (bond_kobj_init(slave))
1716		return NULL;
1717
1718	if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1719		SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1720					       GFP_KERNEL);
1721		if (!SLAVE_AD_INFO(slave)) {
1722			kobject_put(&slave->kobj);
1723			return NULL;
1724		}
1725	}
1726
1727	return slave;
1728}
1729
1730static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1731{
1732	info->bond_mode = BOND_MODE(bond);
1733	info->miimon = bond->params.miimon;
1734	info->num_slaves = bond->slave_cnt;
1735}
1736
1737static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1738{
1739	strcpy(info->slave_name, slave->dev->name);
1740	info->link = slave->link;
1741	info->state = bond_slave_state(slave);
1742	info->link_failure_count = slave->link_failure_count;
1743}
1744
1745static void bond_netdev_notify_work(struct work_struct *_work)
1746{
1747	struct slave *slave = container_of(_work, struct slave,
1748					   notify_work.work);
1749
1750	if (rtnl_trylock()) {
1751		struct netdev_bonding_info binfo;
1752
1753		bond_fill_ifslave(slave, &binfo.slave);
1754		bond_fill_ifbond(slave->bond, &binfo.master);
1755		netdev_bonding_info_change(slave->dev, &binfo);
1756		rtnl_unlock();
1757	} else {
1758		queue_delayed_work(slave->bond->wq, &slave->notify_work, 1);
1759	}
1760}
1761
1762void bond_queue_slave_event(struct slave *slave)
1763{
1764	queue_delayed_work(slave->bond->wq, &slave->notify_work, 0);
1765}
1766
1767void bond_lower_state_changed(struct slave *slave)
1768{
1769	struct netdev_lag_lower_state_info info;
1770
1771	info.link_up = slave->link == BOND_LINK_UP ||
1772		       slave->link == BOND_LINK_FAIL;
1773	info.tx_enabled = bond_is_active_slave(slave);
1774	netdev_lower_state_changed(slave->dev, &info);
1775}
1776
1777#define BOND_NL_ERR(bond_dev, extack, errmsg) do {		\
1778	if (extack)						\
1779		NL_SET_ERR_MSG(extack, errmsg);			\
1780	else							\
1781		netdev_err(bond_dev, "Error: %s\n", errmsg);	\
1782} while (0)
1783
1784#define SLAVE_NL_ERR(bond_dev, slave_dev, extack, errmsg) do {		\
1785	if (extack)							\
1786		NL_SET_ERR_MSG(extack, errmsg);				\
1787	else								\
1788		slave_err(bond_dev, slave_dev, "Error: %s\n", errmsg);	\
1789} while (0)
1790
1791/* The bonding driver uses ether_setup() to convert a master bond device
1792 * to ARPHRD_ETHER, that resets the target netdevice's flags so we always
1793 * have to restore the IFF_MASTER flag, and only restore IFF_SLAVE and IFF_UP
1794 * if they were set
1795 */
1796static void bond_ether_setup(struct net_device *bond_dev)
1797{
1798	unsigned int flags = bond_dev->flags & (IFF_SLAVE | IFF_UP);
1799
1800	ether_setup(bond_dev);
1801	bond_dev->flags |= IFF_MASTER | flags;
1802	bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1803}
1804
1805void bond_xdp_set_features(struct net_device *bond_dev)
1806{
1807	struct bonding *bond = netdev_priv(bond_dev);
1808	xdp_features_t val = NETDEV_XDP_ACT_MASK;
1809	struct list_head *iter;
1810	struct slave *slave;
1811
1812	ASSERT_RTNL();
1813
1814	if (!bond_xdp_check(bond) || !bond_has_slaves(bond)) {
1815		xdp_clear_features_flag(bond_dev);
1816		return;
1817	}
1818
1819	bond_for_each_slave(bond, slave, iter)
1820		val &= slave->dev->xdp_features;
1821
1822	val &= ~NETDEV_XDP_ACT_XSK_ZEROCOPY;
1823
1824	xdp_set_features_flag(bond_dev, val);
1825}
1826
1827/* enslave device <slave> to bond device <master> */
1828int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
1829		 struct netlink_ext_ack *extack)
1830{
1831	struct bonding *bond = netdev_priv(bond_dev);
1832	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1833	struct slave *new_slave = NULL, *prev_slave;
1834	struct sockaddr_storage ss;
1835	int link_reporting;
1836	int res = 0, i;
1837
1838	if (slave_dev->flags & IFF_MASTER &&
1839	    !netif_is_bond_master(slave_dev)) {
1840		BOND_NL_ERR(bond_dev, extack,
1841			    "Device type (master device) cannot be enslaved");
1842		return -EPERM;
1843	}
1844
1845	if (!bond->params.use_carrier &&
1846	    slave_dev->ethtool_ops->get_link == NULL &&
1847	    slave_ops->ndo_eth_ioctl == NULL) {
1848		slave_warn(bond_dev, slave_dev, "no link monitoring support\n");
1849	}
1850
1851	/* already in-use? */
1852	if (netdev_is_rx_handler_busy(slave_dev)) {
1853		SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1854			     "Device is in use and cannot be enslaved");
1855		return -EBUSY;
1856	}
1857
1858	if (bond_dev == slave_dev) {
1859		BOND_NL_ERR(bond_dev, extack, "Cannot enslave bond to itself.");
1860		return -EPERM;
1861	}
1862
1863	/* vlan challenged mutual exclusion */
1864	/* no need to lock since we're protected by rtnl_lock */
1865	if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1866		slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n");
1867		if (vlan_uses_dev(bond_dev)) {
1868			SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1869				     "Can not enslave VLAN challenged device to VLAN enabled bond");
1870			return -EPERM;
1871		} else {
1872			slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n");
1873		}
1874	} else {
1875		slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n");
1876	}
1877
1878	if (slave_dev->features & NETIF_F_HW_ESP)
1879		slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n");
1880
1881	/* Old ifenslave binaries are no longer supported.  These can
1882	 * be identified with moderate accuracy by the state of the slave:
1883	 * the current ifenslave will set the interface down prior to
1884	 * enslaving it; the old ifenslave will not.
1885	 */
1886	if (slave_dev->flags & IFF_UP) {
1887		SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1888			     "Device can not be enslaved while up");
1889		return -EPERM;
1890	}
1891
1892	/* set bonding device ether type by slave - bonding netdevices are
1893	 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1894	 * there is a need to override some of the type dependent attribs/funcs.
1895	 *
1896	 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1897	 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1898	 */
1899	if (!bond_has_slaves(bond)) {
1900		if (bond_dev->type != slave_dev->type) {
1901			slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n",
1902				  bond_dev->type, slave_dev->type);
1903
1904			res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1905						       bond_dev);
1906			res = notifier_to_errno(res);
1907			if (res) {
1908				slave_err(bond_dev, slave_dev, "refused to change device type\n");
1909				return -EBUSY;
1910			}
1911
1912			/* Flush unicast and multicast addresses */
1913			dev_uc_flush(bond_dev);
1914			dev_mc_flush(bond_dev);
1915
1916			if (slave_dev->type != ARPHRD_ETHER)
1917				bond_setup_by_slave(bond_dev, slave_dev);
1918			else
1919				bond_ether_setup(bond_dev);
1920
1921			call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1922						 bond_dev);
1923		}
1924	} else if (bond_dev->type != slave_dev->type) {
1925		SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1926			     "Device type is different from other slaves");
1927		return -EINVAL;
1928	}
1929
1930	if (slave_dev->type == ARPHRD_INFINIBAND &&
1931	    BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1932		SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1933			     "Only active-backup mode is supported for infiniband slaves");
1934		res = -EOPNOTSUPP;
1935		goto err_undo_flags;
1936	}
1937
1938	if (!slave_ops->ndo_set_mac_address ||
1939	    slave_dev->type == ARPHRD_INFINIBAND) {
1940		slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n");
1941		if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1942		    bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1943			if (!bond_has_slaves(bond)) {
1944				bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1945				slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n");
1946			} else {
1947				SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1948					     "Slave device does not support setting the MAC address, but fail_over_mac is not set to active");
1949				res = -EOPNOTSUPP;
1950				goto err_undo_flags;
1951			}
1952		}
1953	}
1954
1955	call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1956
1957	/* If this is the first slave, then we need to set the master's hardware
1958	 * address to be the same as the slave's.
1959	 */
1960	if (!bond_has_slaves(bond) &&
1961	    bond->dev->addr_assign_type == NET_ADDR_RANDOM) {
1962		res = bond_set_dev_addr(bond->dev, slave_dev);
1963		if (res)
1964			goto err_undo_flags;
1965	}
1966
1967	new_slave = bond_alloc_slave(bond, slave_dev);
1968	if (!new_slave) {
1969		res = -ENOMEM;
1970		goto err_undo_flags;
1971	}
1972
1973	/* Set the new_slave's queue_id to be zero.  Queue ID mapping
1974	 * is set via sysfs or module option if desired.
1975	 */
1976	new_slave->queue_id = 0;
1977
1978	/* Save slave's original mtu and then set it to match the bond */
1979	new_slave->original_mtu = slave_dev->mtu;
1980	res = dev_set_mtu(slave_dev, bond->dev->mtu);
1981	if (res) {
1982		slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res);
1983		goto err_free;
1984	}
1985
1986	/* Save slave's original ("permanent") mac address for modes
1987	 * that need it, and for restoring it upon release, and then
1988	 * set it to the master's address
1989	 */
1990	bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,
1991			  slave_dev->addr_len);
1992
1993	if (!bond->params.fail_over_mac ||
1994	    BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1995		/* Set slave to master's mac address.  The application already
1996		 * set the master's mac address to that of the first slave
1997		 */
1998		memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
1999		ss.ss_family = slave_dev->type;
2000		res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss,
2001					  extack);
2002		if (res) {
2003			slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res);
2004			goto err_restore_mtu;
2005		}
2006	}
2007
2008	/* set no_addrconf flag before open to prevent IPv6 addrconf */
2009	slave_dev->priv_flags |= IFF_NO_ADDRCONF;
2010
2011	/* open the slave since the application closed it */
2012	res = dev_open(slave_dev, extack);
2013	if (res) {
2014		slave_err(bond_dev, slave_dev, "Opening slave failed\n");
2015		goto err_restore_mac;
2016	}
2017
2018	slave_dev->priv_flags |= IFF_BONDING;
2019	/* initialize slave stats */
2020	dev_get_stats(new_slave->dev, &new_slave->slave_stats);
2021
2022	if (bond_is_lb(bond)) {
2023		/* bond_alb_init_slave() must be called before all other stages since
2024		 * it might fail and we do not want to have to undo everything
2025		 */
2026		res = bond_alb_init_slave(bond, new_slave);
2027		if (res)
2028			goto err_close;
2029	}
2030
2031	res = vlan_vids_add_by_dev(slave_dev, bond_dev);
2032	if (res) {
2033		slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n");
2034		goto err_close;
2035	}
2036
2037	prev_slave = bond_last_slave(bond);
2038
2039	new_slave->delay = 0;
2040	new_slave->link_failure_count = 0;
2041
2042	if (bond_update_speed_duplex(new_slave) &&
2043	    bond_needs_speed_duplex(bond))
2044		new_slave->link = BOND_LINK_DOWN;
2045
2046	new_slave->last_rx = jiffies -
2047		(msecs_to_jiffies(bond->params.arp_interval) + 1);
2048	for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
2049		new_slave->target_last_arp_rx[i] = new_slave->last_rx;
2050
2051	new_slave->last_tx = new_slave->last_rx;
2052
2053	if (bond->params.miimon && !bond->params.use_carrier) {
2054		link_reporting = bond_check_dev_link(bond, slave_dev, 1);
2055
2056		if ((link_reporting == -1) && !bond->params.arp_interval) {
2057			/* miimon is set but a bonded network driver
2058			 * does not support ETHTOOL/MII and
2059			 * arp_interval is not set.  Note: if
2060			 * use_carrier is enabled, we will never go
2061			 * here (because netif_carrier is always
2062			 * supported); thus, we don't need to change
2063			 * the messages for netif_carrier.
2064			 */
2065			slave_warn(bond_dev, slave_dev, "MII and ETHTOOL support not available for slave, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n");
2066		} else if (link_reporting == -1) {
2067			/* unable get link status using mii/ethtool */
2068			slave_warn(bond_dev, slave_dev, "can't get link status from slave; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface\n");
2069		}
2070	}
2071
2072	/* check for initial state */
2073	new_slave->link = BOND_LINK_NOCHANGE;
2074	if (bond->params.miimon) {
2075		if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
2076			if (bond->params.updelay) {
2077				bond_set_slave_link_state(new_slave,
2078							  BOND_LINK_BACK,
2079							  BOND_SLAVE_NOTIFY_NOW);
2080				new_slave->delay = bond->params.updelay;
2081			} else {
2082				bond_set_slave_link_state(new_slave,
2083							  BOND_LINK_UP,
2084							  BOND_SLAVE_NOTIFY_NOW);
2085			}
2086		} else {
2087			bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
2088						  BOND_SLAVE_NOTIFY_NOW);
2089		}
2090	} else if (bond->params.arp_interval) {
2091		bond_set_slave_link_state(new_slave,
2092					  (netif_carrier_ok(slave_dev) ?
2093					  BOND_LINK_UP : BOND_LINK_DOWN),
2094					  BOND_SLAVE_NOTIFY_NOW);
2095	} else {
2096		bond_set_slave_link_state(new_slave, BOND_LINK_UP,
2097					  BOND_SLAVE_NOTIFY_NOW);
2098	}
2099
2100	if (new_slave->link != BOND_LINK_DOWN)
2101		new_slave->last_link_up = jiffies;
2102	slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n",
2103		  new_slave->link == BOND_LINK_DOWN ? "DOWN" :
2104		  (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
2105
2106	if (bond_uses_primary(bond) && bond->params.primary[0]) {
2107		/* if there is a primary slave, remember it */
2108		if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
2109			rcu_assign_pointer(bond->primary_slave, new_slave);
2110			bond->force_primary = true;
2111		}
2112	}
2113
2114	switch (BOND_MODE(bond)) {
2115	case BOND_MODE_ACTIVEBACKUP:
2116		bond_set_slave_inactive_flags(new_slave,
2117					      BOND_SLAVE_NOTIFY_NOW);
2118		break;
2119	case BOND_MODE_8023AD:
2120		/* in 802.3ad mode, the internal mechanism
2121		 * will activate the slaves in the selected
2122		 * aggregator
2123		 */
2124		bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
2125		/* if this is the first slave */
2126		if (!prev_slave) {
2127			SLAVE_AD_INFO(new_slave)->id = 1;
2128			/* Initialize AD with the number of times that the AD timer is called in 1 second
2129			 * can be called only after the mac address of the bond is set
2130			 */
2131			bond_3ad_initialize(bond);
2132		} else {
2133			SLAVE_AD_INFO(new_slave)->id =
2134				SLAVE_AD_INFO(prev_slave)->id + 1;
2135		}
2136
2137		bond_3ad_bind_slave(new_slave);
2138		break;
2139	case BOND_MODE_TLB:
2140	case BOND_MODE_ALB:
2141		bond_set_active_slave(new_slave);
2142		bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
2143		break;
2144	default:
2145		slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n");
2146
2147		/* always active in trunk mode */
2148		bond_set_active_slave(new_slave);
2149
2150		/* In trunking mode there is little meaning to curr_active_slave
2151		 * anyway (it holds no special properties of the bond device),
2152		 * so we can change it without calling change_active_interface()
2153		 */
2154		if (!rcu_access_pointer(bond->curr_active_slave) &&
2155		    new_slave->link == BOND_LINK_UP)
2156			rcu_assign_pointer(bond->curr_active_slave, new_slave);
2157
2158		break;
2159	} /* switch(bond_mode) */
2160
2161#ifdef CONFIG_NET_POLL_CONTROLLER
2162	if (bond->dev->npinfo) {
2163		if (slave_enable_netpoll(new_slave)) {
2164			slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
2165			res = -EBUSY;
2166			goto err_detach;
2167		}
2168	}
2169#endif
2170
2171	if (!(bond_dev->features & NETIF_F_LRO))
2172		dev_disable_lro(slave_dev);
2173
2174	res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
2175					 new_slave);
2176	if (res) {
2177		slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res);
2178		goto err_detach;
2179	}
2180
2181	res = bond_master_upper_dev_link(bond, new_slave, extack);
2182	if (res) {
2183		slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res);
2184		goto err_unregister;
2185	}
2186
2187	bond_lower_state_changed(new_slave);
2188
2189	res = bond_sysfs_slave_add(new_slave);
2190	if (res) {
2191		slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res);
2192		goto err_upper_unlink;
2193	}
2194
2195	/* If the mode uses primary, then the following is handled by
2196	 * bond_change_active_slave().
2197	 */
2198	if (!bond_uses_primary(bond)) {
2199		/* set promiscuity level to new slave */
2200		if (bond_dev->flags & IFF_PROMISC) {
2201			res = dev_set_promiscuity(slave_dev, 1);
2202			if (res)
2203				goto err_sysfs_del;
2204		}
2205
2206		/* set allmulti level to new slave */
2207		if (bond_dev->flags & IFF_ALLMULTI) {
2208			res = dev_set_allmulti(slave_dev, 1);
2209			if (res) {
2210				if (bond_dev->flags & IFF_PROMISC)
2211					dev_set_promiscuity(slave_dev, -1);
2212				goto err_sysfs_del;
2213			}
2214		}
2215
2216		if (bond_dev->flags & IFF_UP) {
2217			netif_addr_lock_bh(bond_dev);
2218			dev_mc_sync_multiple(slave_dev, bond_dev);
2219			dev_uc_sync_multiple(slave_dev, bond_dev);
2220			netif_addr_unlock_bh(bond_dev);
2221
2222			if (BOND_MODE(bond) == BOND_MODE_8023AD)
2223				dev_mc_add(slave_dev, lacpdu_mcast_addr);
2224		}
2225	}
2226
2227	bond->slave_cnt++;
2228	bond_compute_features(bond);
2229	bond_set_carrier(bond);
2230
 
 
 
 
 
2231	if (bond_uses_primary(bond)) {
2232		block_netpoll_tx();
2233		bond_select_active_slave(bond);
2234		unblock_netpoll_tx();
2235	}
2236
2237	if (bond_mode_can_use_xmit_hash(bond))
2238		bond_update_slave_arr(bond, NULL);
2239
2240
2241	if (!slave_dev->netdev_ops->ndo_bpf ||
2242	    !slave_dev->netdev_ops->ndo_xdp_xmit) {
2243		if (bond->xdp_prog) {
2244			SLAVE_NL_ERR(bond_dev, slave_dev, extack,
2245				     "Slave does not support XDP");
2246			res = -EOPNOTSUPP;
2247			goto err_sysfs_del;
2248		}
2249	} else if (bond->xdp_prog) {
2250		struct netdev_bpf xdp = {
2251			.command = XDP_SETUP_PROG,
2252			.flags   = 0,
2253			.prog    = bond->xdp_prog,
2254			.extack  = extack,
2255		};
2256
2257		if (dev_xdp_prog_count(slave_dev) > 0) {
2258			SLAVE_NL_ERR(bond_dev, slave_dev, extack,
2259				     "Slave has XDP program loaded, please unload before enslaving");
2260			res = -EOPNOTSUPP;
2261			goto err_sysfs_del;
2262		}
2263
2264		res = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp);
2265		if (res < 0) {
2266			/* ndo_bpf() sets extack error message */
2267			slave_dbg(bond_dev, slave_dev, "Error %d calling ndo_bpf\n", res);
2268			goto err_sysfs_del;
2269		}
2270		if (bond->xdp_prog)
2271			bpf_prog_inc(bond->xdp_prog);
2272	}
2273
2274	bond_xdp_set_features(bond_dev);
2275
2276	slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n",
2277		   bond_is_active_slave(new_slave) ? "an active" : "a backup",
2278		   new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
2279
2280	/* enslave is successful */
2281	bond_queue_slave_event(new_slave);
2282	return 0;
2283
2284/* Undo stages on error */
2285err_sysfs_del:
2286	bond_sysfs_slave_del(new_slave);
2287
2288err_upper_unlink:
2289	bond_upper_dev_unlink(bond, new_slave);
2290
2291err_unregister:
2292	netdev_rx_handler_unregister(slave_dev);
2293
2294err_detach:
2295	vlan_vids_del_by_dev(slave_dev, bond_dev);
2296	if (rcu_access_pointer(bond->primary_slave) == new_slave)
2297		RCU_INIT_POINTER(bond->primary_slave, NULL);
2298	if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
2299		block_netpoll_tx();
2300		bond_change_active_slave(bond, NULL);
2301		bond_select_active_slave(bond);
2302		unblock_netpoll_tx();
2303	}
2304	/* either primary_slave or curr_active_slave might've changed */
2305	synchronize_rcu();
2306	slave_disable_netpoll(new_slave);
2307
2308err_close:
2309	if (!netif_is_bond_master(slave_dev))
2310		slave_dev->priv_flags &= ~IFF_BONDING;
2311	dev_close(slave_dev);
2312
2313err_restore_mac:
2314	slave_dev->priv_flags &= ~IFF_NO_ADDRCONF;
2315	if (!bond->params.fail_over_mac ||
2316	    BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2317		/* XXX TODO - fom follow mode needs to change master's
2318		 * MAC if this slave's MAC is in use by the bond, or at
2319		 * least print a warning.
2320		 */
2321		bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
2322				  new_slave->dev->addr_len);
2323		ss.ss_family = slave_dev->type;
2324		dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2325	}
2326
2327err_restore_mtu:
2328	dev_set_mtu(slave_dev, new_slave->original_mtu);
2329
2330err_free:
2331	kobject_put(&new_slave->kobj);
2332
2333err_undo_flags:
2334	/* Enslave of first slave has failed and we need to fix master's mac */
2335	if (!bond_has_slaves(bond)) {
2336		if (ether_addr_equal_64bits(bond_dev->dev_addr,
2337					    slave_dev->dev_addr))
2338			eth_hw_addr_random(bond_dev);
2339		if (bond_dev->type != ARPHRD_ETHER) {
2340			dev_close(bond_dev);
2341			bond_ether_setup(bond_dev);
2342		}
2343	}
2344
2345	return res;
2346}
2347
2348/* Try to release the slave device <slave> from the bond device <master>
2349 * It is legal to access curr_active_slave without a lock because all the function
2350 * is RTNL-locked. If "all" is true it means that the function is being called
2351 * while destroying a bond interface and all slaves are being released.
2352 *
2353 * The rules for slave state should be:
2354 *   for Active/Backup:
2355 *     Active stays on all backups go down
2356 *   for Bonded connections:
2357 *     The first up interface should be left on and all others downed.
2358 */
2359static int __bond_release_one(struct net_device *bond_dev,
2360			      struct net_device *slave_dev,
2361			      bool all, bool unregister)
2362{
2363	struct bonding *bond = netdev_priv(bond_dev);
2364	struct slave *slave, *oldcurrent;
2365	struct sockaddr_storage ss;
2366	int old_flags = bond_dev->flags;
2367	netdev_features_t old_features = bond_dev->features;
2368
2369	/* slave is not a slave or master is not master of this slave */
2370	if (!(slave_dev->flags & IFF_SLAVE) ||
2371	    !netdev_has_upper_dev(slave_dev, bond_dev)) {
2372		slave_dbg(bond_dev, slave_dev, "cannot release slave\n");
2373		return -EINVAL;
2374	}
2375
2376	block_netpoll_tx();
2377
2378	slave = bond_get_slave_by_dev(bond, slave_dev);
2379	if (!slave) {
2380		/* not a slave of this bond */
2381		slave_info(bond_dev, slave_dev, "interface not enslaved\n");
2382		unblock_netpoll_tx();
2383		return -EINVAL;
2384	}
2385
2386	bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
2387
2388	bond_sysfs_slave_del(slave);
2389
2390	/* recompute stats just before removing the slave */
2391	bond_get_stats(bond->dev, &bond->bond_stats);
2392
2393	if (bond->xdp_prog) {
2394		struct netdev_bpf xdp = {
2395			.command = XDP_SETUP_PROG,
2396			.flags   = 0,
2397			.prog	 = NULL,
2398			.extack  = NULL,
2399		};
2400		if (slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp))
2401			slave_warn(bond_dev, slave_dev, "failed to unload XDP program\n");
2402	}
2403
2404	/* unregister rx_handler early so bond_handle_frame wouldn't be called
2405	 * for this slave anymore.
2406	 */
2407	netdev_rx_handler_unregister(slave_dev);
2408
2409	if (BOND_MODE(bond) == BOND_MODE_8023AD)
2410		bond_3ad_unbind_slave(slave);
2411
2412	bond_upper_dev_unlink(bond, slave);
2413
2414	if (bond_mode_can_use_xmit_hash(bond))
2415		bond_update_slave_arr(bond, slave);
2416
2417	slave_info(bond_dev, slave_dev, "Releasing %s interface\n",
2418		    bond_is_active_slave(slave) ? "active" : "backup");
2419
2420	oldcurrent = rcu_access_pointer(bond->curr_active_slave);
2421
2422	RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2423
2424	if (!all && (!bond->params.fail_over_mac ||
2425		     BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
2426		if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
2427		    bond_has_slaves(bond))
2428			slave_warn(bond_dev, slave_dev, "the permanent HWaddr of slave - %pM - is still in use by bond - set the HWaddr of slave to a different address to avoid conflicts\n",
2429				   slave->perm_hwaddr);
2430	}
2431
2432	if (rtnl_dereference(bond->primary_slave) == slave)
2433		RCU_INIT_POINTER(bond->primary_slave, NULL);
2434
2435	if (oldcurrent == slave)
2436		bond_change_active_slave(bond, NULL);
2437
 
 
 
 
 
 
2438	if (bond_is_lb(bond)) {
2439		/* Must be called only after the slave has been
2440		 * detached from the list and the curr_active_slave
2441		 * has been cleared (if our_slave == old_current),
2442		 * but before a new active slave is selected.
2443		 */
2444		bond_alb_deinit_slave(bond, slave);
2445	}
2446
2447	if (all) {
2448		RCU_INIT_POINTER(bond->curr_active_slave, NULL);
2449	} else if (oldcurrent == slave) {
2450		/* Note that we hold RTNL over this sequence, so there
2451		 * is no concern that another slave add/remove event
2452		 * will interfere.
2453		 */
2454		bond_select_active_slave(bond);
2455	}
2456
2457	bond_set_carrier(bond);
2458	if (!bond_has_slaves(bond))
2459		eth_hw_addr_random(bond_dev);
2460
2461	unblock_netpoll_tx();
2462	synchronize_rcu();
2463	bond->slave_cnt--;
2464
2465	if (!bond_has_slaves(bond)) {
2466		call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2467		call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
2468	}
2469
2470	bond_compute_features(bond);
2471	if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2472	    (old_features & NETIF_F_VLAN_CHALLENGED))
2473		slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n");
2474
2475	vlan_vids_del_by_dev(slave_dev, bond_dev);
2476
2477	/* If the mode uses primary, then this case was handled above by
2478	 * bond_change_active_slave(..., NULL)
2479	 */
2480	if (!bond_uses_primary(bond)) {
2481		/* unset promiscuity level from slave
2482		 * NOTE: The NETDEV_CHANGEADDR call above may change the value
2483		 * of the IFF_PROMISC flag in the bond_dev, but we need the
2484		 * value of that flag before that change, as that was the value
2485		 * when this slave was attached, so we cache at the start of the
2486		 * function and use it here. Same goes for ALLMULTI below
2487		 */
2488		if (old_flags & IFF_PROMISC)
2489			dev_set_promiscuity(slave_dev, -1);
2490
2491		/* unset allmulti level from slave */
2492		if (old_flags & IFF_ALLMULTI)
2493			dev_set_allmulti(slave_dev, -1);
2494
2495		if (old_flags & IFF_UP)
2496			bond_hw_addr_flush(bond_dev, slave_dev);
2497	}
2498
2499	slave_disable_netpoll(slave);
2500
2501	/* close slave before restoring its mac address */
2502	dev_close(slave_dev);
2503
2504	slave_dev->priv_flags &= ~IFF_NO_ADDRCONF;
2505
2506	if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
2507	    BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2508		/* restore original ("permanent") mac address */
2509		bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
2510				  slave->dev->addr_len);
2511		ss.ss_family = slave_dev->type;
2512		dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2513	}
2514
2515	if (unregister)
2516		__dev_set_mtu(slave_dev, slave->original_mtu);
2517	else
2518		dev_set_mtu(slave_dev, slave->original_mtu);
2519
2520	if (!netif_is_bond_master(slave_dev))
2521		slave_dev->priv_flags &= ~IFF_BONDING;
2522
2523	bond_xdp_set_features(bond_dev);
2524	kobject_put(&slave->kobj);
2525
2526	return 0;
2527}
2528
2529/* A wrapper used because of ndo_del_link */
2530int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2531{
2532	return __bond_release_one(bond_dev, slave_dev, false, false);
2533}
2534
2535/* First release a slave and then destroy the bond if no more slaves are left.
2536 * Must be under rtnl_lock when this function is called.
2537 */
2538static int bond_release_and_destroy(struct net_device *bond_dev,
2539				    struct net_device *slave_dev)
2540{
2541	struct bonding *bond = netdev_priv(bond_dev);
2542	int ret;
2543
2544	ret = __bond_release_one(bond_dev, slave_dev, false, true);
2545	if (ret == 0 && !bond_has_slaves(bond) &&
2546	    bond_dev->reg_state != NETREG_UNREGISTERING) {
2547		bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2548		netdev_info(bond_dev, "Destroying bond\n");
2549		bond_remove_proc_entry(bond);
2550		unregister_netdevice(bond_dev);
2551	}
2552	return ret;
2553}
2554
2555static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2556{
2557	struct bonding *bond = netdev_priv(bond_dev);
2558
2559	bond_fill_ifbond(bond, info);
2560}
2561
2562static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2563{
2564	struct bonding *bond = netdev_priv(bond_dev);
2565	struct list_head *iter;
2566	int i = 0, res = -ENODEV;
2567	struct slave *slave;
2568
2569	bond_for_each_slave(bond, slave, iter) {
2570		if (i++ == (int)info->slave_id) {
2571			res = 0;
2572			bond_fill_ifslave(slave, info);
2573			break;
2574		}
2575	}
2576
2577	return res;
2578}
2579
2580/*-------------------------------- Monitoring -------------------------------*/
2581
2582/* called with rcu_read_lock() */
2583static int bond_miimon_inspect(struct bonding *bond)
2584{
2585	bool ignore_updelay = false;
2586	int link_state, commit = 0;
2587	struct list_head *iter;
2588	struct slave *slave;
2589
2590	if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
2591		ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2592	} else {
2593		struct bond_up_slave *usable_slaves;
2594
2595		usable_slaves = rcu_dereference(bond->usable_slaves);
2596
2597		if (usable_slaves && usable_slaves->count == 0)
2598			ignore_updelay = true;
2599	}
2600
2601	bond_for_each_slave_rcu(bond, slave, iter) {
2602		bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2603
2604		link_state = bond_check_dev_link(bond, slave->dev, 0);
2605
2606		switch (slave->link) {
2607		case BOND_LINK_UP:
2608			if (link_state)
2609				continue;
2610
2611			bond_propose_link_state(slave, BOND_LINK_FAIL);
2612			commit++;
2613			slave->delay = bond->params.downdelay;
2614			if (slave->delay && net_ratelimit()) {
2615				slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n",
2616					   (BOND_MODE(bond) ==
2617					    BOND_MODE_ACTIVEBACKUP) ?
2618					    (bond_is_active_slave(slave) ?
2619					     "active " : "backup ") : "",
2620					   bond->params.downdelay * bond->params.miimon);
2621			}
2622			fallthrough;
2623		case BOND_LINK_FAIL:
2624			if (link_state) {
2625				/* recovered before downdelay expired */
2626				bond_propose_link_state(slave, BOND_LINK_UP);
2627				slave->last_link_up = jiffies;
2628				if (net_ratelimit())
2629					slave_info(bond->dev, slave->dev, "link status up again after %d ms\n",
2630						   (bond->params.downdelay - slave->delay) *
2631						   bond->params.miimon);
2632				commit++;
2633				continue;
2634			}
2635
2636			if (slave->delay <= 0) {
2637				bond_propose_link_state(slave, BOND_LINK_DOWN);
2638				commit++;
2639				continue;
2640			}
2641
2642			slave->delay--;
2643			break;
2644
2645		case BOND_LINK_DOWN:
2646			if (!link_state)
2647				continue;
2648
2649			bond_propose_link_state(slave, BOND_LINK_BACK);
2650			commit++;
2651			slave->delay = bond->params.updelay;
2652
2653			if (slave->delay && net_ratelimit()) {
2654				slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n",
2655					   ignore_updelay ? 0 :
2656					   bond->params.updelay *
2657					   bond->params.miimon);
2658			}
2659			fallthrough;
2660		case BOND_LINK_BACK:
2661			if (!link_state) {
2662				bond_propose_link_state(slave, BOND_LINK_DOWN);
2663				if (net_ratelimit())
2664					slave_info(bond->dev, slave->dev, "link status down again after %d ms\n",
2665						   (bond->params.updelay - slave->delay) *
2666						   bond->params.miimon);
2667				commit++;
2668				continue;
2669			}
2670
2671			if (ignore_updelay)
2672				slave->delay = 0;
2673
2674			if (slave->delay <= 0) {
2675				bond_propose_link_state(slave, BOND_LINK_UP);
2676				commit++;
2677				ignore_updelay = false;
2678				continue;
2679			}
2680
2681			slave->delay--;
2682			break;
2683		}
2684	}
2685
2686	return commit;
2687}
2688
2689static void bond_miimon_link_change(struct bonding *bond,
2690				    struct slave *slave,
2691				    char link)
2692{
2693	switch (BOND_MODE(bond)) {
2694	case BOND_MODE_8023AD:
2695		bond_3ad_handle_link_change(slave, link);
2696		break;
2697	case BOND_MODE_TLB:
2698	case BOND_MODE_ALB:
2699		bond_alb_handle_link_change(bond, slave, link);
2700		break;
2701	case BOND_MODE_XOR:
2702		bond_update_slave_arr(bond, NULL);
2703		break;
2704	}
2705}
2706
2707static void bond_miimon_commit(struct bonding *bond)
2708{
2709	struct slave *slave, *primary, *active;
2710	bool do_failover = false;
2711	struct list_head *iter;
2712
2713	ASSERT_RTNL();
2714
2715	bond_for_each_slave(bond, slave, iter) {
2716		switch (slave->link_new_state) {
2717		case BOND_LINK_NOCHANGE:
2718			/* For 802.3ad mode, check current slave speed and
2719			 * duplex again in case its port was disabled after
2720			 * invalid speed/duplex reporting but recovered before
2721			 * link monitoring could make a decision on the actual
2722			 * link status
2723			 */
2724			if (BOND_MODE(bond) == BOND_MODE_8023AD &&
2725			    slave->link == BOND_LINK_UP)
2726				bond_3ad_adapter_speed_duplex_changed(slave);
2727			continue;
2728
2729		case BOND_LINK_UP:
2730			if (bond_update_speed_duplex(slave) &&
2731			    bond_needs_speed_duplex(bond)) {
2732				slave->link = BOND_LINK_DOWN;
2733				if (net_ratelimit())
2734					slave_warn(bond->dev, slave->dev,
2735						   "failed to get link speed/duplex\n");
2736				continue;
2737			}
2738			bond_set_slave_link_state(slave, BOND_LINK_UP,
2739						  BOND_SLAVE_NOTIFY_NOW);
2740			slave->last_link_up = jiffies;
2741
2742			primary = rtnl_dereference(bond->primary_slave);
2743			if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2744				/* prevent it from being the active one */
2745				bond_set_backup_slave(slave);
2746			} else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2747				/* make it immediately active */
2748				bond_set_active_slave(slave);
2749			}
2750
2751			slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n",
2752				   slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2753				   slave->duplex ? "full" : "half");
2754
2755			bond_miimon_link_change(bond, slave, BOND_LINK_UP);
2756
2757			active = rtnl_dereference(bond->curr_active_slave);
2758			if (!active || slave == primary || slave->prio > active->prio)
2759				do_failover = true;
2760
2761			continue;
2762
2763		case BOND_LINK_DOWN:
2764			if (slave->link_failure_count < UINT_MAX)
2765				slave->link_failure_count++;
2766
2767			bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2768						  BOND_SLAVE_NOTIFY_NOW);
2769
2770			if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2771			    BOND_MODE(bond) == BOND_MODE_8023AD)
2772				bond_set_slave_inactive_flags(slave,
2773							      BOND_SLAVE_NOTIFY_NOW);
2774
2775			slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
2776
2777			bond_miimon_link_change(bond, slave, BOND_LINK_DOWN);
2778
2779			if (slave == rcu_access_pointer(bond->curr_active_slave))
2780				do_failover = true;
2781
2782			continue;
2783
2784		default:
2785			slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n",
2786				  slave->link_new_state);
2787			bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2788
2789			continue;
2790		}
2791	}
2792
2793	if (do_failover) {
2794		block_netpoll_tx();
2795		bond_select_active_slave(bond);
2796		unblock_netpoll_tx();
2797	}
2798
2799	bond_set_carrier(bond);
2800}
2801
2802/* bond_mii_monitor
2803 *
2804 * Really a wrapper that splits the mii monitor into two phases: an
2805 * inspection, then (if inspection indicates something needs to be done)
2806 * an acquisition of appropriate locks followed by a commit phase to
2807 * implement whatever link state changes are indicated.
2808 */
2809static void bond_mii_monitor(struct work_struct *work)
2810{
2811	struct bonding *bond = container_of(work, struct bonding,
2812					    mii_work.work);
2813	bool should_notify_peers = false;
2814	bool commit;
2815	unsigned long delay;
2816	struct slave *slave;
2817	struct list_head *iter;
2818
2819	delay = msecs_to_jiffies(bond->params.miimon);
2820
2821	if (!bond_has_slaves(bond))
2822		goto re_arm;
2823
2824	rcu_read_lock();
2825	should_notify_peers = bond_should_notify_peers(bond);
2826	commit = !!bond_miimon_inspect(bond);
2827	if (bond->send_peer_notif) {
2828		rcu_read_unlock();
2829		if (rtnl_trylock()) {
2830			bond->send_peer_notif--;
2831			rtnl_unlock();
2832		}
2833	} else {
2834		rcu_read_unlock();
2835	}
2836
2837	if (commit) {
2838		/* Race avoidance with bond_close cancel of workqueue */
2839		if (!rtnl_trylock()) {
2840			delay = 1;
2841			should_notify_peers = false;
2842			goto re_arm;
2843		}
2844
2845		bond_for_each_slave(bond, slave, iter) {
2846			bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
2847		}
2848		bond_miimon_commit(bond);
2849
2850		rtnl_unlock();	/* might sleep, hold no other locks */
2851	}
2852
2853re_arm:
2854	if (bond->params.miimon)
2855		queue_delayed_work(bond->wq, &bond->mii_work, delay);
2856
2857	if (should_notify_peers) {
2858		if (!rtnl_trylock())
2859			return;
2860		call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2861		rtnl_unlock();
2862	}
2863}
2864
2865static int bond_upper_dev_walk(struct net_device *upper,
2866			       struct netdev_nested_priv *priv)
2867{
2868	__be32 ip = *(__be32 *)priv->data;
2869
2870	return ip == bond_confirm_addr(upper, 0, ip);
2871}
2872
2873static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2874{
2875	struct netdev_nested_priv priv = {
2876		.data = (void *)&ip,
2877	};
2878	bool ret = false;
2879
2880	if (ip == bond_confirm_addr(bond->dev, 0, ip))
2881		return true;
2882
2883	rcu_read_lock();
2884	if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &priv))
2885		ret = true;
2886	rcu_read_unlock();
2887
2888	return ret;
2889}
2890
2891#define BOND_VLAN_PROTO_NONE cpu_to_be16(0xffff)
2892
2893static bool bond_handle_vlan(struct slave *slave, struct bond_vlan_tag *tags,
2894			     struct sk_buff *skb)
2895{
2896	struct net_device *bond_dev = slave->bond->dev;
2897	struct net_device *slave_dev = slave->dev;
2898	struct bond_vlan_tag *outer_tag = tags;
2899
2900	if (!tags || tags->vlan_proto == BOND_VLAN_PROTO_NONE)
2901		return true;
2902
2903	tags++;
2904
2905	/* Go through all the tags backwards and add them to the packet */
2906	while (tags->vlan_proto != BOND_VLAN_PROTO_NONE) {
2907		if (!tags->vlan_id) {
2908			tags++;
2909			continue;
2910		}
2911
2912		slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n",
2913			  ntohs(outer_tag->vlan_proto), tags->vlan_id);
2914		skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2915						tags->vlan_id);
2916		if (!skb) {
2917			net_err_ratelimited("failed to insert inner VLAN tag\n");
2918			return false;
2919		}
2920
2921		tags++;
2922	}
2923	/* Set the outer tag */
2924	if (outer_tag->vlan_id) {
2925		slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n",
2926			  ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2927		__vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2928				       outer_tag->vlan_id);
2929	}
2930
2931	return true;
2932}
2933
2934/* We go to the (large) trouble of VLAN tagging ARP frames because
2935 * switches in VLAN mode (especially if ports are configured as
2936 * "native" to a VLAN) might not pass non-tagged frames.
2937 */
2938static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip,
2939			  __be32 src_ip, struct bond_vlan_tag *tags)
2940{
2941	struct net_device *bond_dev = slave->bond->dev;
2942	struct net_device *slave_dev = slave->dev;
2943	struct sk_buff *skb;
2944
2945	slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n",
2946		  arp_op, &dest_ip, &src_ip);
2947
2948	skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2949			 NULL, slave_dev->dev_addr, NULL);
2950
2951	if (!skb) {
2952		net_err_ratelimited("ARP packet allocation failed\n");
2953		return;
2954	}
2955
2956	if (bond_handle_vlan(slave, tags, skb)) {
2957		slave_update_last_tx(slave);
2958		arp_xmit(skb);
2959	}
2960
2961	return;
2962}
2963
2964/* Validate the device path between the @start_dev and the @end_dev.
2965 * The path is valid if the @end_dev is reachable through device
2966 * stacking.
2967 * When the path is validated, collect any vlan information in the
2968 * path.
2969 */
2970struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2971					      struct net_device *end_dev,
2972					      int level)
2973{
2974	struct bond_vlan_tag *tags;
2975	struct net_device *upper;
2976	struct list_head  *iter;
2977
2978	if (start_dev == end_dev) {
2979		tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC);
2980		if (!tags)
2981			return ERR_PTR(-ENOMEM);
2982		tags[level].vlan_proto = BOND_VLAN_PROTO_NONE;
2983		return tags;
2984	}
2985
2986	netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2987		tags = bond_verify_device_path(upper, end_dev, level + 1);
2988		if (IS_ERR_OR_NULL(tags)) {
2989			if (IS_ERR(tags))
2990				return tags;
2991			continue;
2992		}
2993		if (is_vlan_dev(upper)) {
2994			tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2995			tags[level].vlan_id = vlan_dev_vlan_id(upper);
2996		}
2997
2998		return tags;
2999	}
3000
3001	return NULL;
3002}
3003
3004static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
3005{
3006	struct rtable *rt;
3007	struct bond_vlan_tag *tags;
3008	__be32 *targets = bond->params.arp_targets, addr;
3009	int i;
3010
3011	for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
3012		slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n",
3013			  __func__, &targets[i]);
3014		tags = NULL;
3015
3016		/* Find out through which dev should the packet go */
3017		rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
3018				     RTO_ONLINK, 0);
3019		if (IS_ERR(rt)) {
3020			/* there's no route to target - try to send arp
3021			 * probe to generate any traffic (arp_validate=0)
3022			 */
3023			if (bond->params.arp_validate)
3024				pr_warn_once("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
3025					     bond->dev->name,
3026					     &targets[i]);
3027			bond_arp_send(slave, ARPOP_REQUEST, targets[i],
3028				      0, tags);
3029			continue;
3030		}
3031
3032		/* bond device itself */
3033		if (rt->dst.dev == bond->dev)
3034			goto found;
3035
3036		rcu_read_lock();
3037		tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
3038		rcu_read_unlock();
3039
3040		if (!IS_ERR_OR_NULL(tags))
3041			goto found;
3042
3043		/* Not our device - skip */
3044		slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
3045			   &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
3046
3047		ip_rt_put(rt);
3048		continue;
3049
3050found:
3051		addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
3052		ip_rt_put(rt);
3053		bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags);
3054		kfree(tags);
3055	}
3056}
3057
3058static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
3059{
3060	int i;
3061
3062	if (!sip || !bond_has_this_ip(bond, tip)) {
3063		slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n",
3064			   __func__, &sip, &tip);
3065		return;
3066	}
3067
3068	i = bond_get_targets_ip(bond->params.arp_targets, sip);
3069	if (i == -1) {
3070		slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n",
3071			   __func__, &sip);
3072		return;
3073	}
3074	slave->last_rx = jiffies;
3075	slave->target_last_arp_rx[i] = jiffies;
3076}
3077
3078static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
3079			struct slave *slave)
3080{
3081	struct arphdr *arp = (struct arphdr *)skb->data;
3082	struct slave *curr_active_slave, *curr_arp_slave;
3083	unsigned char *arp_ptr;
3084	__be32 sip, tip;
3085	unsigned int alen;
3086
3087	alen = arp_hdr_len(bond->dev);
3088
3089	if (alen > skb_headlen(skb)) {
3090		arp = kmalloc(alen, GFP_ATOMIC);
3091		if (!arp)
3092			goto out_unlock;
3093		if (skb_copy_bits(skb, 0, arp, alen) < 0)
3094			goto out_unlock;
3095	}
3096
3097	if (arp->ar_hln != bond->dev->addr_len ||
3098	    skb->pkt_type == PACKET_OTHERHOST ||
3099	    skb->pkt_type == PACKET_LOOPBACK ||
3100	    arp->ar_hrd != htons(ARPHRD_ETHER) ||
3101	    arp->ar_pro != htons(ETH_P_IP) ||
3102	    arp->ar_pln != 4)
3103		goto out_unlock;
3104
3105	arp_ptr = (unsigned char *)(arp + 1);
3106	arp_ptr += bond->dev->addr_len;
3107	memcpy(&sip, arp_ptr, 4);
3108	arp_ptr += 4 + bond->dev->addr_len;
3109	memcpy(&tip, arp_ptr, 4);
3110
3111	slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
3112		  __func__, slave->dev->name, bond_slave_state(slave),
3113		  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
3114		  &sip, &tip);
3115
3116	curr_active_slave = rcu_dereference(bond->curr_active_slave);
3117	curr_arp_slave = rcu_dereference(bond->current_arp_slave);
3118
3119	/* We 'trust' the received ARP enough to validate it if:
3120	 *
3121	 * (a) the slave receiving the ARP is active (which includes the
3122	 * current ARP slave, if any), or
3123	 *
3124	 * (b) the receiving slave isn't active, but there is a currently
3125	 * active slave and it received valid arp reply(s) after it became
3126	 * the currently active slave, or
3127	 *
3128	 * (c) there is an ARP slave that sent an ARP during the prior ARP
3129	 * interval, and we receive an ARP reply on any slave.  We accept
3130	 * these because switch FDB update delays may deliver the ARP
3131	 * reply to a slave other than the sender of the ARP request.
3132	 *
3133	 * Note: for (b), backup slaves are receiving the broadcast ARP
3134	 * request, not a reply.  This request passes from the sending
3135	 * slave through the L2 switch(es) to the receiving slave.  Since
3136	 * this is checking the request, sip/tip are swapped for
3137	 * validation.
3138	 *
3139	 * This is done to avoid endless looping when we can't reach the
3140	 * arp_ip_target and fool ourselves with our own arp requests.
3141	 */
3142	if (bond_is_active_slave(slave))
3143		bond_validate_arp(bond, slave, sip, tip);
3144	else if (curr_active_slave &&
3145		 time_after(slave_last_rx(bond, curr_active_slave),
3146			    curr_active_slave->last_link_up))
3147		bond_validate_arp(bond, slave, tip, sip);
3148	else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
3149		 bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1))
3150		bond_validate_arp(bond, slave, sip, tip);
3151
3152out_unlock:
3153	if (arp != (struct arphdr *)skb->data)
3154		kfree(arp);
3155	return RX_HANDLER_ANOTHER;
3156}
3157
3158#if IS_ENABLED(CONFIG_IPV6)
3159static void bond_ns_send(struct slave *slave, const struct in6_addr *daddr,
3160			 const struct in6_addr *saddr, struct bond_vlan_tag *tags)
3161{
3162	struct net_device *bond_dev = slave->bond->dev;
3163	struct net_device *slave_dev = slave->dev;
3164	struct in6_addr mcaddr;
3165	struct sk_buff *skb;
3166
3167	slave_dbg(bond_dev, slave_dev, "NS on slave: dst %pI6c src %pI6c\n",
3168		  daddr, saddr);
3169
3170	skb = ndisc_ns_create(slave_dev, daddr, saddr, 0);
3171	if (!skb) {
3172		net_err_ratelimited("NS packet allocation failed\n");
3173		return;
3174	}
3175
3176	addrconf_addr_solict_mult(daddr, &mcaddr);
3177	if (bond_handle_vlan(slave, tags, skb)) {
3178		slave_update_last_tx(slave);
3179		ndisc_send_skb(skb, &mcaddr, saddr);
3180	}
3181}
3182
3183static void bond_ns_send_all(struct bonding *bond, struct slave *slave)
3184{
3185	struct in6_addr *targets = bond->params.ns_targets;
3186	struct bond_vlan_tag *tags;
3187	struct dst_entry *dst;
3188	struct in6_addr saddr;
3189	struct flowi6 fl6;
3190	int i;
3191
3192	for (i = 0; i < BOND_MAX_NS_TARGETS && !ipv6_addr_any(&targets[i]); i++) {
3193		slave_dbg(bond->dev, slave->dev, "%s: target %pI6c\n",
3194			  __func__, &targets[i]);
3195		tags = NULL;
3196
3197		/* Find out through which dev should the packet go */
3198		memset(&fl6, 0, sizeof(struct flowi6));
3199		fl6.daddr = targets[i];
3200		fl6.flowi6_oif = bond->dev->ifindex;
3201
3202		dst = ip6_route_output(dev_net(bond->dev), NULL, &fl6);
3203		if (dst->error) {
3204			dst_release(dst);
3205			/* there's no route to target - try to send arp
3206			 * probe to generate any traffic (arp_validate=0)
3207			 */
3208			if (bond->params.arp_validate)
3209				pr_warn_once("%s: no route to ns_ip6_target %pI6c and arp_validate is set\n",
3210					     bond->dev->name,
3211					     &targets[i]);
3212			bond_ns_send(slave, &targets[i], &in6addr_any, tags);
3213			continue;
3214		}
3215
3216		/* bond device itself */
3217		if (dst->dev == bond->dev)
3218			goto found;
3219
3220		rcu_read_lock();
3221		tags = bond_verify_device_path(bond->dev, dst->dev, 0);
3222		rcu_read_unlock();
3223
3224		if (!IS_ERR_OR_NULL(tags))
3225			goto found;
3226
3227		/* Not our device - skip */
3228		slave_dbg(bond->dev, slave->dev, "no path to ns_ip6_target %pI6c via dst->dev %s\n",
3229			  &targets[i], dst->dev ? dst->dev->name : "NULL");
3230
3231		dst_release(dst);
3232		continue;
3233
3234found:
3235		if (!ipv6_dev_get_saddr(dev_net(dst->dev), dst->dev, &targets[i], 0, &saddr))
3236			bond_ns_send(slave, &targets[i], &saddr, tags);
3237		else
3238			bond_ns_send(slave, &targets[i], &in6addr_any, tags);
3239
3240		dst_release(dst);
3241		kfree(tags);
3242	}
3243}
3244
3245static int bond_confirm_addr6(struct net_device *dev,
3246			      struct netdev_nested_priv *priv)
3247{
3248	struct in6_addr *addr = (struct in6_addr *)priv->data;
3249
3250	return ipv6_chk_addr(dev_net(dev), addr, dev, 0);
3251}
3252
3253static bool bond_has_this_ip6(struct bonding *bond, struct in6_addr *addr)
3254{
3255	struct netdev_nested_priv priv = {
3256		.data = addr,
3257	};
3258	int ret = false;
3259
3260	if (bond_confirm_addr6(bond->dev, &priv))
3261		return true;
3262
3263	rcu_read_lock();
3264	if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_confirm_addr6, &priv))
3265		ret = true;
3266	rcu_read_unlock();
3267
3268	return ret;
3269}
3270
3271static void bond_validate_na(struct bonding *bond, struct slave *slave,
3272			     struct in6_addr *saddr, struct in6_addr *daddr)
3273{
3274	int i;
3275
3276	/* Ignore NAs that:
3277	 * 1. Source address is unspecified address.
3278	 * 2. Dest address is neither all-nodes multicast address nor
3279	 *    exist on bond interface.
3280	 */
3281	if (ipv6_addr_any(saddr) ||
3282	    (!ipv6_addr_equal(daddr, &in6addr_linklocal_allnodes) &&
3283	     !bond_has_this_ip6(bond, daddr))) {
3284		slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c tip %pI6c not found\n",
3285			  __func__, saddr, daddr);
3286		return;
3287	}
3288
3289	i = bond_get_targets_ip6(bond->params.ns_targets, saddr);
3290	if (i == -1) {
3291		slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c not found in targets\n",
3292			  __func__, saddr);
3293		return;
3294	}
3295	slave->last_rx = jiffies;
3296	slave->target_last_arp_rx[i] = jiffies;
3297}
3298
3299static int bond_na_rcv(const struct sk_buff *skb, struct bonding *bond,
3300		       struct slave *slave)
3301{
3302	struct slave *curr_active_slave, *curr_arp_slave;
3303	struct in6_addr *saddr, *daddr;
3304	struct {
3305		struct ipv6hdr ip6;
3306		struct icmp6hdr icmp6;
3307	} *combined, _combined;
3308
3309	if (skb->pkt_type == PACKET_OTHERHOST ||
3310	    skb->pkt_type == PACKET_LOOPBACK)
3311		goto out;
3312
3313	combined = skb_header_pointer(skb, 0, sizeof(_combined), &_combined);
3314	if (!combined || combined->ip6.nexthdr != NEXTHDR_ICMP ||
3315	    (combined->icmp6.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION &&
3316	     combined->icmp6.icmp6_type != NDISC_NEIGHBOUR_ADVERTISEMENT))
3317		goto out;
3318
3319	saddr = &combined->ip6.saddr;
3320	daddr = &combined->ip6.daddr;
3321
3322	slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI6c tip %pI6c\n",
3323		  __func__, slave->dev->name, bond_slave_state(slave),
3324		  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
3325		  saddr, daddr);
3326
3327	curr_active_slave = rcu_dereference(bond->curr_active_slave);
3328	curr_arp_slave = rcu_dereference(bond->current_arp_slave);
3329
3330	/* We 'trust' the received ARP enough to validate it if:
3331	 * see bond_arp_rcv().
3332	 */
3333	if (bond_is_active_slave(slave))
3334		bond_validate_na(bond, slave, saddr, daddr);
3335	else if (curr_active_slave &&
3336		 time_after(slave_last_rx(bond, curr_active_slave),
3337			    curr_active_slave->last_link_up))
3338		bond_validate_na(bond, slave, daddr, saddr);
3339	else if (curr_arp_slave &&
3340		 bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1))
3341		bond_validate_na(bond, slave, saddr, daddr);
3342
3343out:
3344	return RX_HANDLER_ANOTHER;
3345}
3346#endif
3347
3348int bond_rcv_validate(const struct sk_buff *skb, struct bonding *bond,
3349		      struct slave *slave)
3350{
3351#if IS_ENABLED(CONFIG_IPV6)
3352	bool is_ipv6 = skb->protocol == __cpu_to_be16(ETH_P_IPV6);
3353#endif
3354	bool is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
3355
3356	slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n",
3357		  __func__, skb->dev->name);
3358
3359	/* Use arp validate logic for both ARP and NS */
3360	if (!slave_do_arp_validate(bond, slave)) {
3361		if ((slave_do_arp_validate_only(bond) && is_arp) ||
3362#if IS_ENABLED(CONFIG_IPV6)
3363		    (slave_do_arp_validate_only(bond) && is_ipv6) ||
3364#endif
3365		    !slave_do_arp_validate_only(bond))
3366			slave->last_rx = jiffies;
3367		return RX_HANDLER_ANOTHER;
3368	} else if (is_arp) {
3369		return bond_arp_rcv(skb, bond, slave);
3370#if IS_ENABLED(CONFIG_IPV6)
3371	} else if (is_ipv6) {
3372		return bond_na_rcv(skb, bond, slave);
3373#endif
3374	} else {
3375		return RX_HANDLER_ANOTHER;
3376	}
3377}
3378
3379static void bond_send_validate(struct bonding *bond, struct slave *slave)
3380{
3381	bond_arp_send_all(bond, slave);
3382#if IS_ENABLED(CONFIG_IPV6)
3383	bond_ns_send_all(bond, slave);
3384#endif
3385}
3386
3387/* function to verify if we're in the arp_interval timeslice, returns true if
3388 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
3389 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
3390 */
3391static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
3392				  int mod)
3393{
3394	int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3395
3396	return time_in_range(jiffies,
3397			     last_act - delta_in_ticks,
3398			     last_act + mod * delta_in_ticks + delta_in_ticks/2);
3399}
3400
3401/* This function is called regularly to monitor each slave's link
3402 * ensuring that traffic is being sent and received when arp monitoring
3403 * is used in load-balancing mode. if the adapter has been dormant, then an
3404 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
3405 * arp monitoring in active backup mode.
3406 */
3407static void bond_loadbalance_arp_mon(struct bonding *bond)
3408{
3409	struct slave *slave, *oldcurrent;
3410	struct list_head *iter;
3411	int do_failover = 0, slave_state_changed = 0;
3412
3413	if (!bond_has_slaves(bond))
3414		goto re_arm;
3415
3416	rcu_read_lock();
3417
3418	oldcurrent = rcu_dereference(bond->curr_active_slave);
3419	/* see if any of the previous devices are up now (i.e. they have
3420	 * xmt and rcv traffic). the curr_active_slave does not come into
3421	 * the picture unless it is null. also, slave->last_link_up is not
3422	 * needed here because we send an arp on each slave and give a slave
3423	 * as long as it needs to get the tx/rx within the delta.
3424	 * TODO: what about up/down delay in arp mode? it wasn't here before
3425	 *       so it can wait
3426	 */
3427	bond_for_each_slave_rcu(bond, slave, iter) {
3428		unsigned long last_tx = slave_last_tx(slave);
3429
3430		bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
3431
3432		if (slave->link != BOND_LINK_UP) {
3433			if (bond_time_in_interval(bond, last_tx, 1) &&
3434			    bond_time_in_interval(bond, slave->last_rx, 1)) {
3435
3436				bond_propose_link_state(slave, BOND_LINK_UP);
3437				slave_state_changed = 1;
3438
3439				/* primary_slave has no meaning in round-robin
3440				 * mode. the window of a slave being up and
3441				 * curr_active_slave being null after enslaving
3442				 * is closed.
3443				 */
3444				if (!oldcurrent) {
3445					slave_info(bond->dev, slave->dev, "link status definitely up\n");
3446					do_failover = 1;
3447				} else {
3448					slave_info(bond->dev, slave->dev, "interface is now up\n");
3449				}
3450			}
3451		} else {
3452			/* slave->link == BOND_LINK_UP */
3453
3454			/* not all switches will respond to an arp request
3455			 * when the source ip is 0, so don't take the link down
3456			 * if we don't know our ip yet
3457			 */
3458			if (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) ||
3459			    !bond_time_in_interval(bond, slave->last_rx, bond->params.missed_max)) {
3460
3461				bond_propose_link_state(slave, BOND_LINK_DOWN);
3462				slave_state_changed = 1;
3463
3464				if (slave->link_failure_count < UINT_MAX)
3465					slave->link_failure_count++;
3466
3467				slave_info(bond->dev, slave->dev, "interface is now down\n");
3468
3469				if (slave == oldcurrent)
3470					do_failover = 1;
3471			}
3472		}
3473
3474		/* note: if switch is in round-robin mode, all links
3475		 * must tx arp to ensure all links rx an arp - otherwise
3476		 * links may oscillate or not come up at all; if switch is
3477		 * in something like xor mode, there is nothing we can
3478		 * do - all replies will be rx'ed on same link causing slaves
3479		 * to be unstable during low/no traffic periods
3480		 */
3481		if (bond_slave_is_up(slave))
3482			bond_send_validate(bond, slave);
3483	}
3484
3485	rcu_read_unlock();
3486
3487	if (do_failover || slave_state_changed) {
3488		if (!rtnl_trylock())
3489			goto re_arm;
3490
3491		bond_for_each_slave(bond, slave, iter) {
3492			if (slave->link_new_state != BOND_LINK_NOCHANGE)
3493				slave->link = slave->link_new_state;
3494		}
3495
3496		if (slave_state_changed) {
3497			bond_slave_state_change(bond);
3498			if (BOND_MODE(bond) == BOND_MODE_XOR)
3499				bond_update_slave_arr(bond, NULL);
3500		}
3501		if (do_failover) {
3502			block_netpoll_tx();
3503			bond_select_active_slave(bond);
3504			unblock_netpoll_tx();
3505		}
3506		rtnl_unlock();
3507	}
3508
3509re_arm:
3510	if (bond->params.arp_interval)
3511		queue_delayed_work(bond->wq, &bond->arp_work,
3512				   msecs_to_jiffies(bond->params.arp_interval));
3513}
3514
3515/* Called to inspect slaves for active-backup mode ARP monitor link state
3516 * changes.  Sets proposed link state in slaves to specify what action
3517 * should take place for the slave.  Returns 0 if no changes are found, >0
3518 * if changes to link states must be committed.
3519 *
3520 * Called with rcu_read_lock held.
3521 */
3522static int bond_ab_arp_inspect(struct bonding *bond)
3523{
3524	unsigned long last_tx, last_rx;
3525	struct list_head *iter;
3526	struct slave *slave;
3527	int commit = 0;
3528
3529	bond_for_each_slave_rcu(bond, slave, iter) {
3530		bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
3531		last_rx = slave_last_rx(bond, slave);
3532
3533		if (slave->link != BOND_LINK_UP) {
3534			if (bond_time_in_interval(bond, last_rx, 1)) {
3535				bond_propose_link_state(slave, BOND_LINK_UP);
3536				commit++;
3537			} else if (slave->link == BOND_LINK_BACK) {
3538				bond_propose_link_state(slave, BOND_LINK_FAIL);
3539				commit++;
3540			}
3541			continue;
3542		}
3543
3544		/* Give slaves 2*delta after being enslaved or made
3545		 * active.  This avoids bouncing, as the last receive
3546		 * times need a full ARP monitor cycle to be updated.
3547		 */
3548		if (bond_time_in_interval(bond, slave->last_link_up, 2))
3549			continue;
3550
3551		/* Backup slave is down if:
3552		 * - No current_arp_slave AND
3553		 * - more than (missed_max+1)*delta since last receive AND
3554		 * - the bond has an IP address
3555		 *
3556		 * Note: a non-null current_arp_slave indicates
3557		 * the curr_active_slave went down and we are
3558		 * searching for a new one; under this condition
3559		 * we only take the curr_active_slave down - this
3560		 * gives each slave a chance to tx/rx traffic
3561		 * before being taken out
3562		 */
3563		if (!bond_is_active_slave(slave) &&
3564		    !rcu_access_pointer(bond->current_arp_slave) &&
3565		    !bond_time_in_interval(bond, last_rx, bond->params.missed_max + 1)) {
3566			bond_propose_link_state(slave, BOND_LINK_DOWN);
3567			commit++;
3568		}
3569
3570		/* Active slave is down if:
3571		 * - more than missed_max*delta since transmitting OR
3572		 * - (more than missed_max*delta since receive AND
3573		 *    the bond has an IP address)
3574		 */
3575		last_tx = slave_last_tx(slave);
3576		if (bond_is_active_slave(slave) &&
3577		    (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) ||
3578		     !bond_time_in_interval(bond, last_rx, bond->params.missed_max))) {
3579			bond_propose_link_state(slave, BOND_LINK_DOWN);
3580			commit++;
3581		}
3582	}
3583
3584	return commit;
3585}
3586
3587/* Called to commit link state changes noted by inspection step of
3588 * active-backup mode ARP monitor.
3589 *
3590 * Called with RTNL hold.
3591 */
3592static void bond_ab_arp_commit(struct bonding *bond)
3593{
3594	bool do_failover = false;
3595	struct list_head *iter;
3596	unsigned long last_tx;
3597	struct slave *slave;
3598
3599	bond_for_each_slave(bond, slave, iter) {
3600		switch (slave->link_new_state) {
3601		case BOND_LINK_NOCHANGE:
3602			continue;
3603
3604		case BOND_LINK_UP:
3605			last_tx = slave_last_tx(slave);
3606			if (rtnl_dereference(bond->curr_active_slave) != slave ||
3607			    (!rtnl_dereference(bond->curr_active_slave) &&
3608			     bond_time_in_interval(bond, last_tx, 1))) {
3609				struct slave *current_arp_slave;
3610
3611				current_arp_slave = rtnl_dereference(bond->current_arp_slave);
3612				bond_set_slave_link_state(slave, BOND_LINK_UP,
3613							  BOND_SLAVE_NOTIFY_NOW);
3614				if (current_arp_slave) {
3615					bond_set_slave_inactive_flags(
3616						current_arp_slave,
3617						BOND_SLAVE_NOTIFY_NOW);
3618					RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3619				}
3620
3621				slave_info(bond->dev, slave->dev, "link status definitely up\n");
3622
3623				if (!rtnl_dereference(bond->curr_active_slave) ||
3624				    slave == rtnl_dereference(bond->primary_slave) ||
3625				    slave->prio > rtnl_dereference(bond->curr_active_slave)->prio)
3626					do_failover = true;
3627
3628			}
3629
3630			continue;
3631
3632		case BOND_LINK_DOWN:
3633			if (slave->link_failure_count < UINT_MAX)
3634				slave->link_failure_count++;
3635
3636			bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3637						  BOND_SLAVE_NOTIFY_NOW);
3638			bond_set_slave_inactive_flags(slave,
3639						      BOND_SLAVE_NOTIFY_NOW);
3640
3641			slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
3642
3643			if (slave == rtnl_dereference(bond->curr_active_slave)) {
3644				RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3645				do_failover = true;
3646			}
3647
3648			continue;
3649
3650		case BOND_LINK_FAIL:
3651			bond_set_slave_link_state(slave, BOND_LINK_FAIL,
3652						  BOND_SLAVE_NOTIFY_NOW);
3653			bond_set_slave_inactive_flags(slave,
3654						      BOND_SLAVE_NOTIFY_NOW);
3655
3656			/* A slave has just been enslaved and has become
3657			 * the current active slave.
3658			 */
3659			if (rtnl_dereference(bond->curr_active_slave))
3660				RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3661			continue;
3662
3663		default:
3664			slave_err(bond->dev, slave->dev,
3665				  "impossible: link_new_state %d on slave\n",
3666				  slave->link_new_state);
3667			continue;
3668		}
3669	}
3670
3671	if (do_failover) {
3672		block_netpoll_tx();
3673		bond_select_active_slave(bond);
3674		unblock_netpoll_tx();
3675	}
3676
3677	bond_set_carrier(bond);
3678}
3679
3680/* Send ARP probes for active-backup mode ARP monitor.
3681 *
3682 * Called with rcu_read_lock held.
3683 */
3684static bool bond_ab_arp_probe(struct bonding *bond)
3685{
3686	struct slave *slave, *before = NULL, *new_slave = NULL,
3687		     *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
3688		     *curr_active_slave = rcu_dereference(bond->curr_active_slave);
3689	struct list_head *iter;
3690	bool found = false;
3691	bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
3692
3693	if (curr_arp_slave && curr_active_slave)
3694		netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
3695			    curr_arp_slave->dev->name,
3696			    curr_active_slave->dev->name);
3697
3698	if (curr_active_slave) {
3699		bond_send_validate(bond, curr_active_slave);
3700		return should_notify_rtnl;
3701	}
3702
3703	/* if we don't have a curr_active_slave, search for the next available
3704	 * backup slave from the current_arp_slave and make it the candidate
3705	 * for becoming the curr_active_slave
3706	 */
3707
3708	if (!curr_arp_slave) {
3709		curr_arp_slave = bond_first_slave_rcu(bond);
3710		if (!curr_arp_slave)
3711			return should_notify_rtnl;
3712	}
3713
3714	bond_for_each_slave_rcu(bond, slave, iter) {
3715		if (!found && !before && bond_slave_is_up(slave))
3716			before = slave;
3717
3718		if (found && !new_slave && bond_slave_is_up(slave))
3719			new_slave = slave;
3720		/* if the link state is up at this point, we
3721		 * mark it down - this can happen if we have
3722		 * simultaneous link failures and
3723		 * reselect_active_interface doesn't make this
3724		 * one the current slave so it is still marked
3725		 * up when it is actually down
3726		 */
3727		if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3728			bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3729						  BOND_SLAVE_NOTIFY_LATER);
3730			if (slave->link_failure_count < UINT_MAX)
3731				slave->link_failure_count++;
3732
3733			bond_set_slave_inactive_flags(slave,
3734						      BOND_SLAVE_NOTIFY_LATER);
3735
3736			slave_info(bond->dev, slave->dev, "backup interface is now down\n");
3737		}
3738		if (slave == curr_arp_slave)
3739			found = true;
3740	}
3741
3742	if (!new_slave && before)
3743		new_slave = before;
3744
3745	if (!new_slave)
3746		goto check_state;
3747
3748	bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
3749				  BOND_SLAVE_NOTIFY_LATER);
3750	bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
3751	bond_send_validate(bond, new_slave);
3752	new_slave->last_link_up = jiffies;
3753	rcu_assign_pointer(bond->current_arp_slave, new_slave);
3754
3755check_state:
3756	bond_for_each_slave_rcu(bond, slave, iter) {
3757		if (slave->should_notify || slave->should_notify_link) {
3758			should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
3759			break;
3760		}
3761	}
3762	return should_notify_rtnl;
3763}
3764
3765static void bond_activebackup_arp_mon(struct bonding *bond)
3766{
3767	bool should_notify_peers = false;
3768	bool should_notify_rtnl = false;
3769	int delta_in_ticks;
3770
3771	delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3772
3773	if (!bond_has_slaves(bond))
3774		goto re_arm;
3775
3776	rcu_read_lock();
3777
3778	should_notify_peers = bond_should_notify_peers(bond);
3779
3780	if (bond_ab_arp_inspect(bond)) {
3781		rcu_read_unlock();
3782
3783		/* Race avoidance with bond_close flush of workqueue */
3784		if (!rtnl_trylock()) {
3785			delta_in_ticks = 1;
3786			should_notify_peers = false;
3787			goto re_arm;
3788		}
3789
3790		bond_ab_arp_commit(bond);
3791
3792		rtnl_unlock();
3793		rcu_read_lock();
3794	}
3795
3796	should_notify_rtnl = bond_ab_arp_probe(bond);
3797	rcu_read_unlock();
3798
3799re_arm:
3800	if (bond->params.arp_interval)
3801		queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3802
3803	if (should_notify_peers || should_notify_rtnl) {
3804		if (!rtnl_trylock())
3805			return;
3806
3807		if (should_notify_peers) {
3808			bond->send_peer_notif--;
3809			call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
3810						 bond->dev);
3811		}
3812		if (should_notify_rtnl) {
3813			bond_slave_state_notify(bond);
3814			bond_slave_link_notify(bond);
3815		}
3816
3817		rtnl_unlock();
3818	}
3819}
3820
3821static void bond_arp_monitor(struct work_struct *work)
3822{
3823	struct bonding *bond = container_of(work, struct bonding,
3824					    arp_work.work);
3825
3826	if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3827		bond_activebackup_arp_mon(bond);
3828	else
3829		bond_loadbalance_arp_mon(bond);
3830}
3831
3832/*-------------------------- netdev event handling --------------------------*/
3833
3834/* Change device name */
3835static int bond_event_changename(struct bonding *bond)
3836{
3837	bond_remove_proc_entry(bond);
3838	bond_create_proc_entry(bond);
3839
3840	bond_debug_reregister(bond);
3841
3842	return NOTIFY_DONE;
3843}
3844
3845static int bond_master_netdev_event(unsigned long event,
3846				    struct net_device *bond_dev)
3847{
3848	struct bonding *event_bond = netdev_priv(bond_dev);
3849
3850	netdev_dbg(bond_dev, "%s called\n", __func__);
3851
3852	switch (event) {
3853	case NETDEV_CHANGENAME:
3854		return bond_event_changename(event_bond);
3855	case NETDEV_UNREGISTER:
3856		bond_remove_proc_entry(event_bond);
3857#ifdef CONFIG_XFRM_OFFLOAD
3858		xfrm_dev_state_flush(dev_net(bond_dev), bond_dev, true);
3859#endif /* CONFIG_XFRM_OFFLOAD */
3860		break;
3861	case NETDEV_REGISTER:
3862		bond_create_proc_entry(event_bond);
3863		break;
3864	default:
3865		break;
3866	}
3867
3868	return NOTIFY_DONE;
3869}
3870
3871static int bond_slave_netdev_event(unsigned long event,
3872				   struct net_device *slave_dev)
3873{
3874	struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3875	struct bonding *bond;
3876	struct net_device *bond_dev;
3877
3878	/* A netdev event can be generated while enslaving a device
3879	 * before netdev_rx_handler_register is called in which case
3880	 * slave will be NULL
3881	 */
3882	if (!slave) {
3883		netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__);
3884		return NOTIFY_DONE;
3885	}
3886
3887	bond_dev = slave->bond->dev;
3888	bond = slave->bond;
3889	primary = rtnl_dereference(bond->primary_slave);
3890
3891	slave_dbg(bond_dev, slave_dev, "%s called\n", __func__);
3892
3893	switch (event) {
3894	case NETDEV_UNREGISTER:
3895		if (bond_dev->type != ARPHRD_ETHER)
3896			bond_release_and_destroy(bond_dev, slave_dev);
3897		else
3898			__bond_release_one(bond_dev, slave_dev, false, true);
3899		break;
3900	case NETDEV_UP:
3901	case NETDEV_CHANGE:
3902		/* For 802.3ad mode only:
3903		 * Getting invalid Speed/Duplex values here will put slave
3904		 * in weird state. Mark it as link-fail if the link was
3905		 * previously up or link-down if it hasn't yet come up, and
3906		 * let link-monitoring (miimon) set it right when correct
3907		 * speeds/duplex are available.
3908		 */
3909		if (bond_update_speed_duplex(slave) &&
3910		    BOND_MODE(bond) == BOND_MODE_8023AD) {
3911			if (slave->last_link_up)
3912				slave->link = BOND_LINK_FAIL;
3913			else
3914				slave->link = BOND_LINK_DOWN;
3915		}
3916
3917		if (BOND_MODE(bond) == BOND_MODE_8023AD)
3918			bond_3ad_adapter_speed_duplex_changed(slave);
3919		fallthrough;
3920	case NETDEV_DOWN:
3921		/* Refresh slave-array if applicable!
3922		 * If the setup does not use miimon or arpmon (mode-specific!),
3923		 * then these events will not cause the slave-array to be
3924		 * refreshed. This will cause xmit to use a slave that is not
3925		 * usable. Avoid such situation by refeshing the array at these
3926		 * events. If these (miimon/arpmon) parameters are configured
3927		 * then array gets refreshed twice and that should be fine!
3928		 */
3929		if (bond_mode_can_use_xmit_hash(bond))
3930			bond_update_slave_arr(bond, NULL);
3931		break;
3932	case NETDEV_CHANGEMTU:
3933		/* TODO: Should slaves be allowed to
3934		 * independently alter their MTU?  For
3935		 * an active-backup bond, slaves need
3936		 * not be the same type of device, so
3937		 * MTUs may vary.  For other modes,
3938		 * slaves arguably should have the
3939		 * same MTUs. To do this, we'd need to
3940		 * take over the slave's change_mtu
3941		 * function for the duration of their
3942		 * servitude.
3943		 */
3944		break;
3945	case NETDEV_CHANGENAME:
3946		/* we don't care if we don't have primary set */
3947		if (!bond_uses_primary(bond) ||
3948		    !bond->params.primary[0])
3949			break;
3950
3951		if (slave == primary) {
3952			/* slave's name changed - he's no longer primary */
3953			RCU_INIT_POINTER(bond->primary_slave, NULL);
3954		} else if (!strcmp(slave_dev->name, bond->params.primary)) {
3955			/* we have a new primary slave */
3956			rcu_assign_pointer(bond->primary_slave, slave);
3957		} else { /* we didn't change primary - exit */
3958			break;
3959		}
3960
3961		netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3962			    primary ? slave_dev->name : "none");
3963
3964		block_netpoll_tx();
3965		bond_select_active_slave(bond);
3966		unblock_netpoll_tx();
3967		break;
3968	case NETDEV_FEAT_CHANGE:
3969		if (!bond->notifier_ctx) {
3970			bond->notifier_ctx = true;
3971			bond_compute_features(bond);
3972			bond->notifier_ctx = false;
3973		}
3974		break;
3975	case NETDEV_RESEND_IGMP:
3976		/* Propagate to master device */
3977		call_netdevice_notifiers(event, slave->bond->dev);
3978		break;
3979	case NETDEV_XDP_FEAT_CHANGE:
3980		bond_xdp_set_features(bond_dev);
3981		break;
3982	default:
3983		break;
3984	}
3985
3986	return NOTIFY_DONE;
3987}
3988
3989/* bond_netdev_event: handle netdev notifier chain events.
3990 *
3991 * This function receives events for the netdev chain.  The caller (an
3992 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3993 * locks for us to safely manipulate the slave devices (RTNL lock,
3994 * dev_probe_lock).
3995 */
3996static int bond_netdev_event(struct notifier_block *this,
3997			     unsigned long event, void *ptr)
3998{
3999	struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
4000
4001	netdev_dbg(event_dev, "%s received %s\n",
4002		   __func__, netdev_cmd_to_name(event));
4003
4004	if (!(event_dev->priv_flags & IFF_BONDING))
4005		return NOTIFY_DONE;
4006
4007	if (event_dev->flags & IFF_MASTER) {
4008		int ret;
4009
4010		ret = bond_master_netdev_event(event, event_dev);
4011		if (ret != NOTIFY_DONE)
4012			return ret;
4013	}
4014
4015	if (event_dev->flags & IFF_SLAVE)
4016		return bond_slave_netdev_event(event, event_dev);
4017
4018	return NOTIFY_DONE;
4019}
4020
4021static struct notifier_block bond_netdev_notifier = {
4022	.notifier_call = bond_netdev_event,
4023};
4024
4025/*---------------------------- Hashing Policies -----------------------------*/
4026
4027/* Helper to access data in a packet, with or without a backing skb.
4028 * If skb is given the data is linearized if necessary via pskb_may_pull.
4029 */
4030static inline const void *bond_pull_data(struct sk_buff *skb,
4031					 const void *data, int hlen, int n)
4032{
4033	if (likely(n <= hlen))
4034		return data;
4035	else if (skb && likely(pskb_may_pull(skb, n)))
4036		return skb->data;
4037
4038	return NULL;
4039}
4040
4041/* L2 hash helper */
4042static inline u32 bond_eth_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen)
4043{
4044	struct ethhdr *ep;
4045
4046	data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr));
4047	if (!data)
4048		return 0;
4049
4050	ep = (struct ethhdr *)(data + mhoff);
4051	return ep->h_dest[5] ^ ep->h_source[5] ^ be16_to_cpu(ep->h_proto);
4052}
4053
4054static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk, const void *data,
4055			 int hlen, __be16 l2_proto, int *nhoff, int *ip_proto, bool l34)
4056{
4057	const struct ipv6hdr *iph6;
4058	const struct iphdr *iph;
4059
4060	if (l2_proto == htons(ETH_P_IP)) {
4061		data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph));
4062		if (!data)
4063			return false;
4064
4065		iph = (const struct iphdr *)(data + *nhoff);
4066		iph_to_flow_copy_v4addrs(fk, iph);
4067		*nhoff += iph->ihl << 2;
4068		if (!ip_is_fragment(iph))
4069			*ip_proto = iph->protocol;
4070	} else if (l2_proto == htons(ETH_P_IPV6)) {
4071		data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph6));
4072		if (!data)
4073			return false;
4074
4075		iph6 = (const struct ipv6hdr *)(data + *nhoff);
4076		iph_to_flow_copy_v6addrs(fk, iph6);
4077		*nhoff += sizeof(*iph6);
4078		*ip_proto = iph6->nexthdr;
4079	} else {
4080		return false;
4081	}
4082
4083	if (l34 && *ip_proto >= 0)
4084		fk->ports.ports = __skb_flow_get_ports(skb, *nhoff, *ip_proto, data, hlen);
4085
4086	return true;
4087}
4088
4089static u32 bond_vlan_srcmac_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen)
4090{
4091	u32 srcmac_vendor = 0, srcmac_dev = 0;
4092	struct ethhdr *mac_hdr;
4093	u16 vlan = 0;
4094	int i;
4095
4096	data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr));
4097	if (!data)
4098		return 0;
4099	mac_hdr = (struct ethhdr *)(data + mhoff);
4100
4101	for (i = 0; i < 3; i++)
4102		srcmac_vendor = (srcmac_vendor << 8) | mac_hdr->h_source[i];
4103
4104	for (i = 3; i < ETH_ALEN; i++)
4105		srcmac_dev = (srcmac_dev << 8) | mac_hdr->h_source[i];
4106
4107	if (skb && skb_vlan_tag_present(skb))
4108		vlan = skb_vlan_tag_get(skb);
4109
4110	return vlan ^ srcmac_vendor ^ srcmac_dev;
4111}
4112
4113/* Extract the appropriate headers based on bond's xmit policy */
4114static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, const void *data,
4115			      __be16 l2_proto, int nhoff, int hlen, struct flow_keys *fk)
4116{
4117	bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34;
4118	int ip_proto = -1;
4119
4120	switch (bond->params.xmit_policy) {
4121	case BOND_XMIT_POLICY_ENCAP23:
4122	case BOND_XMIT_POLICY_ENCAP34:
4123		memset(fk, 0, sizeof(*fk));
4124		return __skb_flow_dissect(NULL, skb, &flow_keys_bonding,
4125					  fk, data, l2_proto, nhoff, hlen, 0);
4126	default:
4127		break;
4128	}
4129
4130	fk->ports.ports = 0;
4131	memset(&fk->icmp, 0, sizeof(fk->icmp));
4132	if (!bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34))
4133		return false;
4134
4135	/* ICMP error packets contains at least 8 bytes of the header
4136	 * of the packet which generated the error. Use this information
4137	 * to correlate ICMP error packets within the same flow which
4138	 * generated the error.
4139	 */
4140	if (ip_proto == IPPROTO_ICMP || ip_proto == IPPROTO_ICMPV6) {
4141		skb_flow_get_icmp_tci(skb, &fk->icmp, data, nhoff, hlen);
4142		if (ip_proto == IPPROTO_ICMP) {
4143			if (!icmp_is_err(fk->icmp.type))
4144				return true;
4145
4146			nhoff += sizeof(struct icmphdr);
4147		} else if (ip_proto == IPPROTO_ICMPV6) {
4148			if (!icmpv6_is_err(fk->icmp.type))
4149				return true;
4150
4151			nhoff += sizeof(struct icmp6hdr);
4152		}
4153		return bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34);
4154	}
4155
4156	return true;
4157}
4158
4159static u32 bond_ip_hash(u32 hash, struct flow_keys *flow, int xmit_policy)
4160{
4161	hash ^= (__force u32)flow_get_u32_dst(flow) ^
4162		(__force u32)flow_get_u32_src(flow);
4163	hash ^= (hash >> 16);
4164	hash ^= (hash >> 8);
4165
4166	/* discard lowest hash bit to deal with the common even ports pattern */
4167	if (xmit_policy == BOND_XMIT_POLICY_LAYER34 ||
4168		xmit_policy == BOND_XMIT_POLICY_ENCAP34)
4169		return hash >> 1;
4170
4171	return hash;
4172}
4173
4174/* Generate hash based on xmit policy. If @skb is given it is used to linearize
4175 * the data as required, but this function can be used without it if the data is
4176 * known to be linear (e.g. with xdp_buff).
4177 */
4178static u32 __bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, const void *data,
4179			    __be16 l2_proto, int mhoff, int nhoff, int hlen)
4180{
4181	struct flow_keys flow;
4182	u32 hash;
4183
4184	if (bond->params.xmit_policy == BOND_XMIT_POLICY_VLAN_SRCMAC)
4185		return bond_vlan_srcmac_hash(skb, data, mhoff, hlen);
4186
4187	if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
4188	    !bond_flow_dissect(bond, skb, data, l2_proto, nhoff, hlen, &flow))
4189		return bond_eth_hash(skb, data, mhoff, hlen);
4190
4191	if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
4192	    bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) {
4193		hash = bond_eth_hash(skb, data, mhoff, hlen);
4194	} else {
4195		if (flow.icmp.id)
4196			memcpy(&hash, &flow.icmp, sizeof(hash));
4197		else
4198			memcpy(&hash, &flow.ports.ports, sizeof(hash));
4199	}
4200
4201	return bond_ip_hash(hash, &flow, bond->params.xmit_policy);
4202}
4203
4204/**
4205 * bond_xmit_hash - generate a hash value based on the xmit policy
4206 * @bond: bonding device
4207 * @skb: buffer to use for headers
4208 *
4209 * This function will extract the necessary headers from the skb buffer and use
4210 * them to generate a hash based on the xmit_policy set in the bonding device
4211 */
4212u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
4213{
4214	if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
4215	    skb->l4_hash)
4216		return skb->hash;
4217
4218	return __bond_xmit_hash(bond, skb, skb->data, skb->protocol,
4219				0, skb_network_offset(skb),
4220				skb_headlen(skb));
4221}
4222
4223/**
4224 * bond_xmit_hash_xdp - generate a hash value based on the xmit policy
4225 * @bond: bonding device
4226 * @xdp: buffer to use for headers
4227 *
4228 * The XDP variant of bond_xmit_hash.
4229 */
4230static u32 bond_xmit_hash_xdp(struct bonding *bond, struct xdp_buff *xdp)
4231{
4232	struct ethhdr *eth;
4233
4234	if (xdp->data + sizeof(struct ethhdr) > xdp->data_end)
4235		return 0;
4236
4237	eth = (struct ethhdr *)xdp->data;
4238
4239	return __bond_xmit_hash(bond, NULL, xdp->data, eth->h_proto, 0,
4240				sizeof(struct ethhdr), xdp->data_end - xdp->data);
4241}
4242
4243/*-------------------------- Device entry points ----------------------------*/
4244
4245void bond_work_init_all(struct bonding *bond)
4246{
4247	INIT_DELAYED_WORK(&bond->mcast_work,
4248			  bond_resend_igmp_join_requests_delayed);
4249	INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
4250	INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
4251	INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);
4252	INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
4253	INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
4254}
4255
4256static void bond_work_cancel_all(struct bonding *bond)
4257{
4258	cancel_delayed_work_sync(&bond->mii_work);
4259	cancel_delayed_work_sync(&bond->arp_work);
4260	cancel_delayed_work_sync(&bond->alb_work);
4261	cancel_delayed_work_sync(&bond->ad_work);
4262	cancel_delayed_work_sync(&bond->mcast_work);
4263	cancel_delayed_work_sync(&bond->slave_arr_work);
4264}
4265
4266static int bond_open(struct net_device *bond_dev)
4267{
4268	struct bonding *bond = netdev_priv(bond_dev);
4269	struct list_head *iter;
4270	struct slave *slave;
4271
4272	if (BOND_MODE(bond) == BOND_MODE_ROUNDROBIN && !bond->rr_tx_counter) {
4273		bond->rr_tx_counter = alloc_percpu(u32);
4274		if (!bond->rr_tx_counter)
4275			return -ENOMEM;
4276	}
4277
4278	/* reset slave->backup and slave->inactive */
4279	if (bond_has_slaves(bond)) {
4280		bond_for_each_slave(bond, slave, iter) {
4281			if (bond_uses_primary(bond) &&
4282			    slave != rcu_access_pointer(bond->curr_active_slave)) {
4283				bond_set_slave_inactive_flags(slave,
4284							      BOND_SLAVE_NOTIFY_NOW);
4285			} else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
4286				bond_set_slave_active_flags(slave,
4287							    BOND_SLAVE_NOTIFY_NOW);
4288			}
4289		}
4290	}
4291
4292	if (bond_is_lb(bond)) {
4293		/* bond_alb_initialize must be called before the timer
4294		 * is started.
4295		 */
4296		if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
4297			return -ENOMEM;
4298		if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB)
4299			queue_delayed_work(bond->wq, &bond->alb_work, 0);
4300	}
4301
4302	if (bond->params.miimon)  /* link check interval, in milliseconds. */
4303		queue_delayed_work(bond->wq, &bond->mii_work, 0);
4304
4305	if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
4306		queue_delayed_work(bond->wq, &bond->arp_work, 0);
4307		bond->recv_probe = bond_rcv_validate;
4308	}
4309
4310	if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4311		queue_delayed_work(bond->wq, &bond->ad_work, 0);
4312		/* register to receive LACPDUs */
4313		bond->recv_probe = bond_3ad_lacpdu_recv;
4314		bond_3ad_initiate_agg_selection(bond, 1);
4315
4316		bond_for_each_slave(bond, slave, iter)
4317			dev_mc_add(slave->dev, lacpdu_mcast_addr);
4318	}
4319
4320	if (bond_mode_can_use_xmit_hash(bond))
4321		bond_update_slave_arr(bond, NULL);
4322
4323	return 0;
4324}
4325
4326static int bond_close(struct net_device *bond_dev)
4327{
4328	struct bonding *bond = netdev_priv(bond_dev);
4329	struct slave *slave;
4330
4331	bond_work_cancel_all(bond);
4332	bond->send_peer_notif = 0;
4333	if (bond_is_lb(bond))
4334		bond_alb_deinitialize(bond);
4335	bond->recv_probe = NULL;
4336
4337	if (bond_uses_primary(bond)) {
4338		rcu_read_lock();
4339		slave = rcu_dereference(bond->curr_active_slave);
4340		if (slave)
4341			bond_hw_addr_flush(bond_dev, slave->dev);
4342		rcu_read_unlock();
4343	} else {
4344		struct list_head *iter;
4345
4346		bond_for_each_slave(bond, slave, iter)
4347			bond_hw_addr_flush(bond_dev, slave->dev);
4348	}
4349
4350	return 0;
4351}
4352
4353/* fold stats, assuming all rtnl_link_stats64 fields are u64, but
4354 * that some drivers can provide 32bit values only.
4355 */
4356static void bond_fold_stats(struct rtnl_link_stats64 *_res,
4357			    const struct rtnl_link_stats64 *_new,
4358			    const struct rtnl_link_stats64 *_old)
4359{
4360	const u64 *new = (const u64 *)_new;
4361	const u64 *old = (const u64 *)_old;
4362	u64 *res = (u64 *)_res;
4363	int i;
4364
4365	for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
4366		u64 nv = new[i];
4367		u64 ov = old[i];
4368		s64 delta = nv - ov;
4369
4370		/* detects if this particular field is 32bit only */
4371		if (((nv | ov) >> 32) == 0)
4372			delta = (s64)(s32)((u32)nv - (u32)ov);
4373
4374		/* filter anomalies, some drivers reset their stats
4375		 * at down/up events.
4376		 */
4377		if (delta > 0)
4378			res[i] += delta;
4379	}
4380}
4381
4382#ifdef CONFIG_LOCKDEP
4383static int bond_get_lowest_level_rcu(struct net_device *dev)
4384{
4385	struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
4386	struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
4387	int cur = 0, max = 0;
4388
4389	now = dev;
4390	iter = &dev->adj_list.lower;
4391
4392	while (1) {
4393		next = NULL;
4394		while (1) {
4395			ldev = netdev_next_lower_dev_rcu(now, &iter);
4396			if (!ldev)
4397				break;
4398
4399			next = ldev;
4400			niter = &ldev->adj_list.lower;
4401			dev_stack[cur] = now;
4402			iter_stack[cur++] = iter;
4403			if (max <= cur)
4404				max = cur;
4405			break;
4406		}
4407
4408		if (!next) {
4409			if (!cur)
4410				return max;
4411			next = dev_stack[--cur];
4412			niter = iter_stack[cur];
4413		}
4414
4415		now = next;
4416		iter = niter;
4417	}
4418
4419	return max;
4420}
4421#endif
4422
4423static void bond_get_stats(struct net_device *bond_dev,
4424			   struct rtnl_link_stats64 *stats)
4425{
4426	struct bonding *bond = netdev_priv(bond_dev);
4427	struct rtnl_link_stats64 temp;
4428	struct list_head *iter;
4429	struct slave *slave;
4430	int nest_level = 0;
4431
4432
4433	rcu_read_lock();
4434#ifdef CONFIG_LOCKDEP
4435	nest_level = bond_get_lowest_level_rcu(bond_dev);
4436#endif
4437
4438	spin_lock_nested(&bond->stats_lock, nest_level);
4439	memcpy(stats, &bond->bond_stats, sizeof(*stats));
4440
4441	bond_for_each_slave_rcu(bond, slave, iter) {
4442		const struct rtnl_link_stats64 *new =
4443			dev_get_stats(slave->dev, &temp);
4444
4445		bond_fold_stats(stats, new, &slave->slave_stats);
4446
4447		/* save off the slave stats for the next run */
4448		memcpy(&slave->slave_stats, new, sizeof(*new));
4449	}
4450
4451	memcpy(&bond->bond_stats, stats, sizeof(*stats));
4452	spin_unlock(&bond->stats_lock);
4453	rcu_read_unlock();
4454}
4455
4456static int bond_eth_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
4457{
4458	struct bonding *bond = netdev_priv(bond_dev);
4459	struct mii_ioctl_data *mii = NULL;
4460
4461	netdev_dbg(bond_dev, "bond_eth_ioctl: cmd=%d\n", cmd);
4462
4463	switch (cmd) {
4464	case SIOCGMIIPHY:
4465		mii = if_mii(ifr);
4466		if (!mii)
4467			return -EINVAL;
4468
4469		mii->phy_id = 0;
4470		fallthrough;
4471	case SIOCGMIIREG:
4472		/* We do this again just in case we were called by SIOCGMIIREG
4473		 * instead of SIOCGMIIPHY.
4474		 */
4475		mii = if_mii(ifr);
4476		if (!mii)
4477			return -EINVAL;
4478
4479		if (mii->reg_num == 1) {
4480			mii->val_out = 0;
4481			if (netif_carrier_ok(bond->dev))
4482				mii->val_out = BMSR_LSTATUS;
4483		}
4484
4485		break;
4486	default:
4487		return -EOPNOTSUPP;
4488	}
4489
4490	return 0;
4491}
4492
4493static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
4494{
4495	struct bonding *bond = netdev_priv(bond_dev);
4496	struct net_device *slave_dev = NULL;
4497	struct ifbond k_binfo;
4498	struct ifbond __user *u_binfo = NULL;
4499	struct ifslave k_sinfo;
4500	struct ifslave __user *u_sinfo = NULL;
4501	struct bond_opt_value newval;
4502	struct net *net;
4503	int res = 0;
4504
4505	netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
4506
4507	switch (cmd) {
4508	case SIOCBONDINFOQUERY:
4509		u_binfo = (struct ifbond __user *)ifr->ifr_data;
4510
4511		if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
4512			return -EFAULT;
4513
4514		bond_info_query(bond_dev, &k_binfo);
4515		if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
4516			return -EFAULT;
4517
4518		return 0;
4519	case SIOCBONDSLAVEINFOQUERY:
4520		u_sinfo = (struct ifslave __user *)ifr->ifr_data;
4521
4522		if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
4523			return -EFAULT;
4524
4525		res = bond_slave_info_query(bond_dev, &k_sinfo);
4526		if (res == 0 &&
4527		    copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
4528			return -EFAULT;
4529
4530		return res;
4531	default:
4532		break;
4533	}
4534
4535	net = dev_net(bond_dev);
4536
4537	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
4538		return -EPERM;
4539
4540	slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
4541
4542	slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev);
4543
4544	if (!slave_dev)
4545		return -ENODEV;
4546
4547	switch (cmd) {
4548	case SIOCBONDENSLAVE:
4549		res = bond_enslave(bond_dev, slave_dev, NULL);
4550		break;
4551	case SIOCBONDRELEASE:
4552		res = bond_release(bond_dev, slave_dev);
4553		break;
4554	case SIOCBONDSETHWADDR:
4555		res = bond_set_dev_addr(bond_dev, slave_dev);
4556		break;
4557	case SIOCBONDCHANGEACTIVE:
4558		bond_opt_initstr(&newval, slave_dev->name);
4559		res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,
4560					    &newval);
4561		break;
4562	default:
4563		res = -EOPNOTSUPP;
4564	}
4565
4566	return res;
4567}
4568
4569static int bond_siocdevprivate(struct net_device *bond_dev, struct ifreq *ifr,
4570			       void __user *data, int cmd)
4571{
4572	struct ifreq ifrdata = { .ifr_data = data };
4573
4574	switch (cmd) {
4575	case BOND_INFO_QUERY_OLD:
4576		return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDINFOQUERY);
4577	case BOND_SLAVE_INFO_QUERY_OLD:
4578		return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDSLAVEINFOQUERY);
4579	case BOND_ENSLAVE_OLD:
4580		return bond_do_ioctl(bond_dev, ifr, SIOCBONDENSLAVE);
4581	case BOND_RELEASE_OLD:
4582		return bond_do_ioctl(bond_dev, ifr, SIOCBONDRELEASE);
4583	case BOND_SETHWADDR_OLD:
4584		return bond_do_ioctl(bond_dev, ifr, SIOCBONDSETHWADDR);
4585	case BOND_CHANGE_ACTIVE_OLD:
4586		return bond_do_ioctl(bond_dev, ifr, SIOCBONDCHANGEACTIVE);
4587	}
4588
4589	return -EOPNOTSUPP;
4590}
4591
4592static void bond_change_rx_flags(struct net_device *bond_dev, int change)
4593{
4594	struct bonding *bond = netdev_priv(bond_dev);
4595
4596	if (change & IFF_PROMISC)
4597		bond_set_promiscuity(bond,
4598				     bond_dev->flags & IFF_PROMISC ? 1 : -1);
4599
4600	if (change & IFF_ALLMULTI)
4601		bond_set_allmulti(bond,
4602				  bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
4603}
4604
4605static void bond_set_rx_mode(struct net_device *bond_dev)
4606{
4607	struct bonding *bond = netdev_priv(bond_dev);
4608	struct list_head *iter;
4609	struct slave *slave;
4610
4611	rcu_read_lock();
4612	if (bond_uses_primary(bond)) {
4613		slave = rcu_dereference(bond->curr_active_slave);
4614		if (slave) {
4615			dev_uc_sync(slave->dev, bond_dev);
4616			dev_mc_sync(slave->dev, bond_dev);
4617		}
4618	} else {
4619		bond_for_each_slave_rcu(bond, slave, iter) {
4620			dev_uc_sync_multiple(slave->dev, bond_dev);
4621			dev_mc_sync_multiple(slave->dev, bond_dev);
4622		}
4623	}
4624	rcu_read_unlock();
4625}
4626
4627static int bond_neigh_init(struct neighbour *n)
4628{
4629	struct bonding *bond = netdev_priv(n->dev);
4630	const struct net_device_ops *slave_ops;
4631	struct neigh_parms parms;
4632	struct slave *slave;
4633	int ret = 0;
4634
4635	rcu_read_lock();
4636	slave = bond_first_slave_rcu(bond);
4637	if (!slave)
4638		goto out;
4639	slave_ops = slave->dev->netdev_ops;
4640	if (!slave_ops->ndo_neigh_setup)
4641		goto out;
4642
4643	/* TODO: find another way [1] to implement this.
4644	 * Passing a zeroed structure is fragile,
4645	 * but at least we do not pass garbage.
4646	 *
4647	 * [1] One way would be that ndo_neigh_setup() never touch
4648	 *     struct neigh_parms, but propagate the new neigh_setup()
4649	 *     back to ___neigh_create() / neigh_parms_alloc()
4650	 */
4651	memset(&parms, 0, sizeof(parms));
4652	ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
4653
4654	if (ret)
4655		goto out;
4656
4657	if (parms.neigh_setup)
4658		ret = parms.neigh_setup(n);
4659out:
4660	rcu_read_unlock();
4661	return ret;
4662}
4663
4664/* The bonding ndo_neigh_setup is called at init time beofre any
4665 * slave exists. So we must declare proxy setup function which will
4666 * be used at run time to resolve the actual slave neigh param setup.
4667 *
4668 * It's also called by master devices (such as vlans) to setup their
4669 * underlying devices. In that case - do nothing, we're already set up from
4670 * our init.
4671 */
4672static int bond_neigh_setup(struct net_device *dev,
4673			    struct neigh_parms *parms)
4674{
4675	/* modify only our neigh_parms */
4676	if (parms->dev == dev)
4677		parms->neigh_setup = bond_neigh_init;
4678
4679	return 0;
4680}
4681
4682/* Change the MTU of all of a master's slaves to match the master */
4683static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
4684{
4685	struct bonding *bond = netdev_priv(bond_dev);
4686	struct slave *slave, *rollback_slave;
4687	struct list_head *iter;
4688	int res = 0;
4689
4690	netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
4691
4692	bond_for_each_slave(bond, slave, iter) {
4693		slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n",
4694			   slave, slave->dev->netdev_ops->ndo_change_mtu);
4695
4696		res = dev_set_mtu(slave->dev, new_mtu);
4697
4698		if (res) {
4699			/* If we failed to set the slave's mtu to the new value
4700			 * we must abort the operation even in ACTIVE_BACKUP
4701			 * mode, because if we allow the backup slaves to have
4702			 * different mtu values than the active slave we'll
4703			 * need to change their mtu when doing a failover. That
4704			 * means changing their mtu from timer context, which
4705			 * is probably not a good idea.
4706			 */
4707			slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n",
4708				  res, new_mtu);
4709			goto unwind;
4710		}
4711	}
4712
4713	bond_dev->mtu = new_mtu;
4714
4715	return 0;
4716
4717unwind:
4718	/* unwind from head to the slave that failed */
4719	bond_for_each_slave(bond, rollback_slave, iter) {
4720		int tmp_res;
4721
4722		if (rollback_slave == slave)
4723			break;
4724
4725		tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
4726		if (tmp_res)
4727			slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n",
4728				  tmp_res);
4729	}
4730
4731	return res;
4732}
4733
4734/* Change HW address
4735 *
4736 * Note that many devices must be down to change the HW address, and
4737 * downing the master releases all slaves.  We can make bonds full of
4738 * bonding devices to test this, however.
4739 */
4740static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4741{
4742	struct bonding *bond = netdev_priv(bond_dev);
4743	struct slave *slave, *rollback_slave;
4744	struct sockaddr_storage *ss = addr, tmp_ss;
4745	struct list_head *iter;
4746	int res = 0;
4747
4748	if (BOND_MODE(bond) == BOND_MODE_ALB)
4749		return bond_alb_set_mac_address(bond_dev, addr);
4750
4751
4752	netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond);
4753
4754	/* If fail_over_mac is enabled, do nothing and return success.
4755	 * Returning an error causes ifenslave to fail.
4756	 */
4757	if (bond->params.fail_over_mac &&
4758	    BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
4759		return 0;
4760
4761	if (!is_valid_ether_addr(ss->__data))
4762		return -EADDRNOTAVAIL;
4763
4764	bond_for_each_slave(bond, slave, iter) {
4765		slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n",
4766			  __func__, slave);
4767		res = dev_set_mac_address(slave->dev, addr, NULL);
4768		if (res) {
4769			/* TODO: consider downing the slave
4770			 * and retry ?
4771			 * User should expect communications
4772			 * breakage anyway until ARP finish
4773			 * updating, so...
4774			 */
4775			slave_dbg(bond_dev, slave->dev, "%s: err %d\n",
4776				  __func__, res);
4777			goto unwind;
4778		}
4779	}
4780
4781	/* success */
4782	dev_addr_set(bond_dev, ss->__data);
4783	return 0;
4784
4785unwind:
4786	memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
4787	tmp_ss.ss_family = bond_dev->type;
4788
4789	/* unwind from head to the slave that failed */
4790	bond_for_each_slave(bond, rollback_slave, iter) {
4791		int tmp_res;
4792
4793		if (rollback_slave == slave)
4794			break;
4795
4796		tmp_res = dev_set_mac_address(rollback_slave->dev,
4797					      (struct sockaddr *)&tmp_ss, NULL);
4798		if (tmp_res) {
4799			slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n",
4800				   __func__, tmp_res);
4801		}
4802	}
4803
4804	return res;
4805}
4806
4807/**
4808 * bond_get_slave_by_id - get xmit slave with slave_id
4809 * @bond: bonding device that is transmitting
4810 * @slave_id: slave id up to slave_cnt-1 through which to transmit
4811 *
4812 * This function tries to get slave with slave_id but in case
4813 * it fails, it tries to find the first available slave for transmission.
4814 */
4815static struct slave *bond_get_slave_by_id(struct bonding *bond,
4816					  int slave_id)
4817{
4818	struct list_head *iter;
4819	struct slave *slave;
4820	int i = slave_id;
4821
4822	/* Here we start from the slave with slave_id */
4823	bond_for_each_slave_rcu(bond, slave, iter) {
4824		if (--i < 0) {
4825			if (bond_slave_can_tx(slave))
4826				return slave;
4827		}
4828	}
4829
4830	/* Here we start from the first slave up to slave_id */
4831	i = slave_id;
4832	bond_for_each_slave_rcu(bond, slave, iter) {
4833		if (--i < 0)
4834			break;
4835		if (bond_slave_can_tx(slave))
4836			return slave;
4837	}
4838	/* no slave that can tx has been found */
4839	return NULL;
4840}
4841
4842/**
4843 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
4844 * @bond: bonding device to use
4845 *
4846 * Based on the value of the bonding device's packets_per_slave parameter
4847 * this function generates a slave id, which is usually used as the next
4848 * slave to transmit through.
4849 */
4850static u32 bond_rr_gen_slave_id(struct bonding *bond)
4851{
4852	u32 slave_id;
4853	struct reciprocal_value reciprocal_packets_per_slave;
4854	int packets_per_slave = bond->params.packets_per_slave;
4855
4856	switch (packets_per_slave) {
4857	case 0:
4858		slave_id = get_random_u32();
4859		break;
4860	case 1:
4861		slave_id = this_cpu_inc_return(*bond->rr_tx_counter);
4862		break;
4863	default:
4864		reciprocal_packets_per_slave =
4865			bond->params.reciprocal_packets_per_slave;
4866		slave_id = this_cpu_inc_return(*bond->rr_tx_counter);
4867		slave_id = reciprocal_divide(slave_id,
4868					     reciprocal_packets_per_slave);
4869		break;
4870	}
4871
4872	return slave_id;
4873}
4874
4875static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond,
4876						    struct sk_buff *skb)
4877{
4878	struct slave *slave;
4879	int slave_cnt;
4880	u32 slave_id;
4881
4882	/* Start with the curr_active_slave that joined the bond as the
4883	 * default for sending IGMP traffic.  For failover purposes one
4884	 * needs to maintain some consistency for the interface that will
4885	 * send the join/membership reports.  The curr_active_slave found
4886	 * will send all of this type of traffic.
4887	 */
4888	if (skb->protocol == htons(ETH_P_IP)) {
4889		int noff = skb_network_offset(skb);
4890		struct iphdr *iph;
4891
4892		if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
4893			goto non_igmp;
4894
4895		iph = ip_hdr(skb);
4896		if (iph->protocol == IPPROTO_IGMP) {
4897			slave = rcu_dereference(bond->curr_active_slave);
4898			if (slave)
4899				return slave;
4900			return bond_get_slave_by_id(bond, 0);
4901		}
4902	}
4903
4904non_igmp:
4905	slave_cnt = READ_ONCE(bond->slave_cnt);
4906	if (likely(slave_cnt)) {
4907		slave_id = bond_rr_gen_slave_id(bond) % slave_cnt;
4908		return bond_get_slave_by_id(bond, slave_id);
4909	}
4910	return NULL;
4911}
4912
4913static struct slave *bond_xdp_xmit_roundrobin_slave_get(struct bonding *bond,
4914							struct xdp_buff *xdp)
4915{
4916	struct slave *slave;
4917	int slave_cnt;
4918	u32 slave_id;
4919	const struct ethhdr *eth;
4920	void *data = xdp->data;
4921
4922	if (data + sizeof(struct ethhdr) > xdp->data_end)
4923		goto non_igmp;
4924
4925	eth = (struct ethhdr *)data;
4926	data += sizeof(struct ethhdr);
4927
4928	/* See comment on IGMP in bond_xmit_roundrobin_slave_get() */
4929	if (eth->h_proto == htons(ETH_P_IP)) {
4930		const struct iphdr *iph;
4931
4932		if (data + sizeof(struct iphdr) > xdp->data_end)
4933			goto non_igmp;
4934
4935		iph = (struct iphdr *)data;
4936
4937		if (iph->protocol == IPPROTO_IGMP) {
4938			slave = rcu_dereference(bond->curr_active_slave);
4939			if (slave)
4940				return slave;
4941			return bond_get_slave_by_id(bond, 0);
4942		}
4943	}
4944
4945non_igmp:
4946	slave_cnt = READ_ONCE(bond->slave_cnt);
4947	if (likely(slave_cnt)) {
4948		slave_id = bond_rr_gen_slave_id(bond) % slave_cnt;
4949		return bond_get_slave_by_id(bond, slave_id);
4950	}
4951	return NULL;
4952}
4953
4954static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb,
4955					struct net_device *bond_dev)
4956{
4957	struct bonding *bond = netdev_priv(bond_dev);
4958	struct slave *slave;
4959
4960	slave = bond_xmit_roundrobin_slave_get(bond, skb);
4961	if (likely(slave))
4962		return bond_dev_queue_xmit(bond, skb, slave->dev);
4963
4964	return bond_tx_drop(bond_dev, skb);
4965}
4966
4967static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond)
4968{
4969	return rcu_dereference(bond->curr_active_slave);
4970}
4971
4972/* In active-backup mode, we know that bond->curr_active_slave is always valid if
4973 * the bond has a usable interface.
4974 */
4975static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb,
4976					  struct net_device *bond_dev)
4977{
4978	struct bonding *bond = netdev_priv(bond_dev);
4979	struct slave *slave;
4980
4981	slave = bond_xmit_activebackup_slave_get(bond);
4982	if (slave)
4983		return bond_dev_queue_xmit(bond, skb, slave->dev);
4984
4985	return bond_tx_drop(bond_dev, skb);
4986}
4987
4988/* Use this to update slave_array when (a) it's not appropriate to update
4989 * slave_array right away (note that update_slave_array() may sleep)
4990 * and / or (b) RTNL is not held.
4991 */
4992void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
4993{
4994	queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
4995}
4996
4997/* Slave array work handler. Holds only RTNL */
4998static void bond_slave_arr_handler(struct work_struct *work)
4999{
5000	struct bonding *bond = container_of(work, struct bonding,
5001					    slave_arr_work.work);
5002	int ret;
5003
5004	if (!rtnl_trylock())
5005		goto err;
5006
5007	ret = bond_update_slave_arr(bond, NULL);
5008	rtnl_unlock();
5009	if (ret) {
5010		pr_warn_ratelimited("Failed to update slave array from WT\n");
5011		goto err;
5012	}
5013	return;
5014
5015err:
5016	bond_slave_arr_work_rearm(bond, 1);
5017}
5018
5019static void bond_skip_slave(struct bond_up_slave *slaves,
5020			    struct slave *skipslave)
5021{
5022	int idx;
5023
5024	/* Rare situation where caller has asked to skip a specific
5025	 * slave but allocation failed (most likely!). BTW this is
5026	 * only possible when the call is initiated from
5027	 * __bond_release_one(). In this situation; overwrite the
5028	 * skipslave entry in the array with the last entry from the
5029	 * array to avoid a situation where the xmit path may choose
5030	 * this to-be-skipped slave to send a packet out.
5031	 */
5032	for (idx = 0; slaves && idx < slaves->count; idx++) {
5033		if (skipslave == slaves->arr[idx]) {
5034			slaves->arr[idx] =
5035				slaves->arr[slaves->count - 1];
5036			slaves->count--;
5037			break;
5038		}
5039	}
5040}
5041
5042static void bond_set_slave_arr(struct bonding *bond,
5043			       struct bond_up_slave *usable_slaves,
5044			       struct bond_up_slave *all_slaves)
5045{
5046	struct bond_up_slave *usable, *all;
5047
5048	usable = rtnl_dereference(bond->usable_slaves);
5049	rcu_assign_pointer(bond->usable_slaves, usable_slaves);
5050	kfree_rcu(usable, rcu);
5051
5052	all = rtnl_dereference(bond->all_slaves);
5053	rcu_assign_pointer(bond->all_slaves, all_slaves);
5054	kfree_rcu(all, rcu);
5055}
5056
5057static void bond_reset_slave_arr(struct bonding *bond)
5058{
5059	bond_set_slave_arr(bond, NULL, NULL);
5060}
5061
5062/* Build the usable slaves array in control path for modes that use xmit-hash
5063 * to determine the slave interface -
5064 * (a) BOND_MODE_8023AD
5065 * (b) BOND_MODE_XOR
5066 * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0
5067 *
5068 * The caller is expected to hold RTNL only and NO other lock!
5069 */
5070int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
5071{
5072	struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL;
5073	struct slave *slave;
5074	struct list_head *iter;
5075	int agg_id = 0;
5076	int ret = 0;
5077
5078	might_sleep();
5079
5080	usable_slaves = kzalloc(struct_size(usable_slaves, arr,
5081					    bond->slave_cnt), GFP_KERNEL);
5082	all_slaves = kzalloc(struct_size(all_slaves, arr,
5083					 bond->slave_cnt), GFP_KERNEL);
5084	if (!usable_slaves || !all_slaves) {
5085		ret = -ENOMEM;
5086		goto out;
5087	}
5088	if (BOND_MODE(bond) == BOND_MODE_8023AD) {
5089		struct ad_info ad_info;
5090
5091		spin_lock_bh(&bond->mode_lock);
5092		if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
5093			spin_unlock_bh(&bond->mode_lock);
5094			pr_debug("bond_3ad_get_active_agg_info failed\n");
5095			/* No active aggragator means it's not safe to use
5096			 * the previous array.
5097			 */
5098			bond_reset_slave_arr(bond);
5099			goto out;
5100		}
5101		spin_unlock_bh(&bond->mode_lock);
5102		agg_id = ad_info.aggregator_id;
5103	}
5104	bond_for_each_slave(bond, slave, iter) {
5105		if (skipslave == slave)
5106			continue;
5107
5108		all_slaves->arr[all_slaves->count++] = slave;
5109		if (BOND_MODE(bond) == BOND_MODE_8023AD) {
5110			struct aggregator *agg;
5111
5112			agg = SLAVE_AD_INFO(slave)->port.aggregator;
5113			if (!agg || agg->aggregator_identifier != agg_id)
5114				continue;
5115		}
5116		if (!bond_slave_can_tx(slave))
5117			continue;
5118
5119		slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n",
5120			  usable_slaves->count);
5121
5122		usable_slaves->arr[usable_slaves->count++] = slave;
5123	}
5124
5125	bond_set_slave_arr(bond, usable_slaves, all_slaves);
5126	return ret;
5127out:
5128	if (ret != 0 && skipslave) {
5129		bond_skip_slave(rtnl_dereference(bond->all_slaves),
5130				skipslave);
5131		bond_skip_slave(rtnl_dereference(bond->usable_slaves),
5132				skipslave);
5133	}
5134	kfree_rcu(all_slaves, rcu);
5135	kfree_rcu(usable_slaves, rcu);
5136
5137	return ret;
5138}
5139
5140static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond,
5141						 struct sk_buff *skb,
5142						 struct bond_up_slave *slaves)
5143{
5144	struct slave *slave;
5145	unsigned int count;
5146	u32 hash;
5147
5148	hash = bond_xmit_hash(bond, skb);
5149	count = slaves ? READ_ONCE(slaves->count) : 0;
5150	if (unlikely(!count))
5151		return NULL;
5152
5153	slave = slaves->arr[hash % count];
5154	return slave;
5155}
5156
5157static struct slave *bond_xdp_xmit_3ad_xor_slave_get(struct bonding *bond,
5158						     struct xdp_buff *xdp)
5159{
5160	struct bond_up_slave *slaves;
5161	unsigned int count;
5162	u32 hash;
5163
5164	hash = bond_xmit_hash_xdp(bond, xdp);
5165	slaves = rcu_dereference(bond->usable_slaves);
5166	count = slaves ? READ_ONCE(slaves->count) : 0;
5167	if (unlikely(!count))
5168		return NULL;
5169
5170	return slaves->arr[hash % count];
5171}
5172
5173/* Use this Xmit function for 3AD as well as XOR modes. The current
5174 * usable slave array is formed in the control path. The xmit function
5175 * just calculates hash and sends the packet out.
5176 */
5177static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb,
5178				     struct net_device *dev)
5179{
5180	struct bonding *bond = netdev_priv(dev);
5181	struct bond_up_slave *slaves;
5182	struct slave *slave;
5183
5184	slaves = rcu_dereference(bond->usable_slaves);
5185	slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
5186	if (likely(slave))
5187		return bond_dev_queue_xmit(bond, skb, slave->dev);
5188
5189	return bond_tx_drop(dev, skb);
5190}
5191
5192/* in broadcast mode, we send everything to all usable interfaces. */
5193static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb,
5194				       struct net_device *bond_dev)
5195{
5196	struct bonding *bond = netdev_priv(bond_dev);
5197	struct slave *slave = NULL;
5198	struct list_head *iter;
5199	bool xmit_suc = false;
5200	bool skb_used = false;
5201
5202	bond_for_each_slave_rcu(bond, slave, iter) {
5203		struct sk_buff *skb2;
5204
5205		if (!(bond_slave_is_up(slave) && slave->link == BOND_LINK_UP))
5206			continue;
5207
5208		if (bond_is_last_slave(bond, slave)) {
5209			skb2 = skb;
5210			skb_used = true;
5211		} else {
5212			skb2 = skb_clone(skb, GFP_ATOMIC);
5213			if (!skb2) {
5214				net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
5215						    bond_dev->name, __func__);
5216				continue;
5217			}
5218		}
5219
5220		if (bond_dev_queue_xmit(bond, skb2, slave->dev) == NETDEV_TX_OK)
5221			xmit_suc = true;
5222	}
5223
5224	if (!skb_used)
5225		dev_kfree_skb_any(skb);
5226
5227	if (xmit_suc)
5228		return NETDEV_TX_OK;
5229
5230	dev_core_stats_tx_dropped_inc(bond_dev);
5231	return NET_XMIT_DROP;
5232}
5233
5234/*------------------------- Device initialization ---------------------------*/
5235
5236/* Lookup the slave that corresponds to a qid */
5237static inline int bond_slave_override(struct bonding *bond,
5238				      struct sk_buff *skb)
5239{
5240	struct slave *slave = NULL;
5241	struct list_head *iter;
5242
5243	if (!skb_rx_queue_recorded(skb))
5244		return 1;
5245
5246	/* Find out if any slaves have the same mapping as this skb. */
5247	bond_for_each_slave_rcu(bond, slave, iter) {
5248		if (slave->queue_id == skb_get_queue_mapping(skb)) {
5249			if (bond_slave_is_up(slave) &&
5250			    slave->link == BOND_LINK_UP) {
5251				bond_dev_queue_xmit(bond, skb, slave->dev);
5252				return 0;
5253			}
5254			/* If the slave isn't UP, use default transmit policy. */
5255			break;
5256		}
5257	}
5258
5259	return 1;
5260}
5261
5262
5263static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
5264			     struct net_device *sb_dev)
5265{
5266	/* This helper function exists to help dev_pick_tx get the correct
5267	 * destination queue.  Using a helper function skips a call to
5268	 * skb_tx_hash and will put the skbs in the queue we expect on their
5269	 * way down to the bonding driver.
5270	 */
5271	u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
5272
5273	/* Save the original txq to restore before passing to the driver */
5274	qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb);
5275
5276	if (unlikely(txq >= dev->real_num_tx_queues)) {
5277		do {
5278			txq -= dev->real_num_tx_queues;
5279		} while (txq >= dev->real_num_tx_queues);
5280	}
5281	return txq;
5282}
5283
5284static struct net_device *bond_xmit_get_slave(struct net_device *master_dev,
5285					      struct sk_buff *skb,
5286					      bool all_slaves)
5287{
5288	struct bonding *bond = netdev_priv(master_dev);
5289	struct bond_up_slave *slaves;
5290	struct slave *slave = NULL;
5291
5292	switch (BOND_MODE(bond)) {
5293	case BOND_MODE_ROUNDROBIN:
5294		slave = bond_xmit_roundrobin_slave_get(bond, skb);
5295		break;
5296	case BOND_MODE_ACTIVEBACKUP:
5297		slave = bond_xmit_activebackup_slave_get(bond);
5298		break;
5299	case BOND_MODE_8023AD:
5300	case BOND_MODE_XOR:
5301		if (all_slaves)
5302			slaves = rcu_dereference(bond->all_slaves);
5303		else
5304			slaves = rcu_dereference(bond->usable_slaves);
5305		slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
5306		break;
5307	case BOND_MODE_BROADCAST:
5308		break;
5309	case BOND_MODE_ALB:
5310		slave = bond_xmit_alb_slave_get(bond, skb);
5311		break;
5312	case BOND_MODE_TLB:
5313		slave = bond_xmit_tlb_slave_get(bond, skb);
5314		break;
5315	default:
5316		/* Should never happen, mode already checked */
5317		WARN_ONCE(true, "Unknown bonding mode");
5318		break;
5319	}
5320
5321	if (slave)
5322		return slave->dev;
5323	return NULL;
5324}
5325
5326static void bond_sk_to_flow(struct sock *sk, struct flow_keys *flow)
5327{
5328	switch (sk->sk_family) {
5329#if IS_ENABLED(CONFIG_IPV6)
5330	case AF_INET6:
5331		if (ipv6_only_sock(sk) ||
5332		    ipv6_addr_type(&sk->sk_v6_daddr) != IPV6_ADDR_MAPPED) {
5333			flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
5334			flow->addrs.v6addrs.src = inet6_sk(sk)->saddr;
5335			flow->addrs.v6addrs.dst = sk->sk_v6_daddr;
5336			break;
5337		}
5338		fallthrough;
5339#endif
5340	default: /* AF_INET */
5341		flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
5342		flow->addrs.v4addrs.src = inet_sk(sk)->inet_rcv_saddr;
5343		flow->addrs.v4addrs.dst = inet_sk(sk)->inet_daddr;
5344		break;
5345	}
5346
5347	flow->ports.src = inet_sk(sk)->inet_sport;
5348	flow->ports.dst = inet_sk(sk)->inet_dport;
5349}
5350
5351/**
5352 * bond_sk_hash_l34 - generate a hash value based on the socket's L3 and L4 fields
5353 * @sk: socket to use for headers
5354 *
5355 * This function will extract the necessary field from the socket and use
5356 * them to generate a hash based on the LAYER34 xmit_policy.
5357 * Assumes that sk is a TCP or UDP socket.
5358 */
5359static u32 bond_sk_hash_l34(struct sock *sk)
5360{
5361	struct flow_keys flow;
5362	u32 hash;
5363
5364	bond_sk_to_flow(sk, &flow);
5365
5366	/* L4 */
5367	memcpy(&hash, &flow.ports.ports, sizeof(hash));
5368	/* L3 */
5369	return bond_ip_hash(hash, &flow, BOND_XMIT_POLICY_LAYER34);
5370}
5371
5372static struct net_device *__bond_sk_get_lower_dev(struct bonding *bond,
5373						  struct sock *sk)
5374{
5375	struct bond_up_slave *slaves;
5376	struct slave *slave;
5377	unsigned int count;
5378	u32 hash;
5379
5380	slaves = rcu_dereference(bond->usable_slaves);
5381	count = slaves ? READ_ONCE(slaves->count) : 0;
5382	if (unlikely(!count))
5383		return NULL;
5384
5385	hash = bond_sk_hash_l34(sk);
5386	slave = slaves->arr[hash % count];
5387
5388	return slave->dev;
5389}
5390
5391static struct net_device *bond_sk_get_lower_dev(struct net_device *dev,
5392						struct sock *sk)
5393{
5394	struct bonding *bond = netdev_priv(dev);
5395	struct net_device *lower = NULL;
5396
5397	rcu_read_lock();
5398	if (bond_sk_check(bond))
5399		lower = __bond_sk_get_lower_dev(bond, sk);
5400	rcu_read_unlock();
5401
5402	return lower;
5403}
5404
5405#if IS_ENABLED(CONFIG_TLS_DEVICE)
5406static netdev_tx_t bond_tls_device_xmit(struct bonding *bond, struct sk_buff *skb,
5407					struct net_device *dev)
5408{
5409	struct net_device *tls_netdev = rcu_dereference(tls_get_ctx(skb->sk)->netdev);
5410
5411	/* tls_netdev might become NULL, even if tls_is_skb_tx_device_offloaded
5412	 * was true, if tls_device_down is running in parallel, but it's OK,
5413	 * because bond_get_slave_by_dev has a NULL check.
5414	 */
5415	if (likely(bond_get_slave_by_dev(bond, tls_netdev)))
5416		return bond_dev_queue_xmit(bond, skb, tls_netdev);
5417	return bond_tx_drop(dev, skb);
5418}
5419#endif
5420
5421static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
5422{
5423	struct bonding *bond = netdev_priv(dev);
5424
5425	if (bond_should_override_tx_queue(bond) &&
5426	    !bond_slave_override(bond, skb))
5427		return NETDEV_TX_OK;
5428
5429#if IS_ENABLED(CONFIG_TLS_DEVICE)
5430	if (tls_is_skb_tx_device_offloaded(skb))
5431		return bond_tls_device_xmit(bond, skb, dev);
5432#endif
5433
5434	switch (BOND_MODE(bond)) {
5435	case BOND_MODE_ROUNDROBIN:
5436		return bond_xmit_roundrobin(skb, dev);
5437	case BOND_MODE_ACTIVEBACKUP:
5438		return bond_xmit_activebackup(skb, dev);
5439	case BOND_MODE_8023AD:
5440	case BOND_MODE_XOR:
5441		return bond_3ad_xor_xmit(skb, dev);
5442	case BOND_MODE_BROADCAST:
5443		return bond_xmit_broadcast(skb, dev);
5444	case BOND_MODE_ALB:
5445		return bond_alb_xmit(skb, dev);
5446	case BOND_MODE_TLB:
5447		return bond_tlb_xmit(skb, dev);
5448	default:
5449		/* Should never happen, mode already checked */
5450		netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
5451		WARN_ON_ONCE(1);
5452		return bond_tx_drop(dev, skb);
5453	}
5454}
5455
5456static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
5457{
5458	struct bonding *bond = netdev_priv(dev);
5459	netdev_tx_t ret = NETDEV_TX_OK;
5460
5461	/* If we risk deadlock from transmitting this in the
5462	 * netpoll path, tell netpoll to queue the frame for later tx
5463	 */
5464	if (unlikely(is_netpoll_tx_blocked(dev)))
5465		return NETDEV_TX_BUSY;
5466
5467	rcu_read_lock();
5468	if (bond_has_slaves(bond))
5469		ret = __bond_start_xmit(skb, dev);
5470	else
5471		ret = bond_tx_drop(dev, skb);
5472	rcu_read_unlock();
5473
5474	return ret;
5475}
5476
5477static struct net_device *
5478bond_xdp_get_xmit_slave(struct net_device *bond_dev, struct xdp_buff *xdp)
5479{
5480	struct bonding *bond = netdev_priv(bond_dev);
5481	struct slave *slave;
5482
5483	/* Caller needs to hold rcu_read_lock() */
5484
5485	switch (BOND_MODE(bond)) {
5486	case BOND_MODE_ROUNDROBIN:
5487		slave = bond_xdp_xmit_roundrobin_slave_get(bond, xdp);
5488		break;
5489
5490	case BOND_MODE_ACTIVEBACKUP:
5491		slave = bond_xmit_activebackup_slave_get(bond);
5492		break;
5493
5494	case BOND_MODE_8023AD:
5495	case BOND_MODE_XOR:
5496		slave = bond_xdp_xmit_3ad_xor_slave_get(bond, xdp);
5497		break;
5498
5499	default:
5500		/* Should never happen. Mode guarded by bond_xdp_check() */
5501		netdev_err(bond_dev, "Unknown bonding mode %d for xdp xmit\n", BOND_MODE(bond));
5502		WARN_ON_ONCE(1);
5503		return NULL;
5504	}
5505
5506	if (slave)
5507		return slave->dev;
5508
5509	return NULL;
5510}
5511
5512static int bond_xdp_xmit(struct net_device *bond_dev,
5513			 int n, struct xdp_frame **frames, u32 flags)
5514{
5515	int nxmit, err = -ENXIO;
5516
5517	rcu_read_lock();
5518
5519	for (nxmit = 0; nxmit < n; nxmit++) {
5520		struct xdp_frame *frame = frames[nxmit];
5521		struct xdp_frame *frames1[] = {frame};
5522		struct net_device *slave_dev;
5523		struct xdp_buff xdp;
5524
5525		xdp_convert_frame_to_buff(frame, &xdp);
5526
5527		slave_dev = bond_xdp_get_xmit_slave(bond_dev, &xdp);
5528		if (!slave_dev) {
5529			err = -ENXIO;
5530			break;
5531		}
5532
5533		err = slave_dev->netdev_ops->ndo_xdp_xmit(slave_dev, 1, frames1, flags);
5534		if (err < 1)
5535			break;
5536	}
5537
5538	rcu_read_unlock();
5539
5540	/* If error happened on the first frame then we can pass the error up, otherwise
5541	 * report the number of frames that were xmitted.
5542	 */
5543	if (err < 0)
5544		return (nxmit == 0 ? err : nxmit);
5545
5546	return nxmit;
5547}
5548
5549static int bond_xdp_set(struct net_device *dev, struct bpf_prog *prog,
5550			struct netlink_ext_ack *extack)
5551{
5552	struct bonding *bond = netdev_priv(dev);
5553	struct list_head *iter;
5554	struct slave *slave, *rollback_slave;
5555	struct bpf_prog *old_prog;
5556	struct netdev_bpf xdp = {
5557		.command = XDP_SETUP_PROG,
5558		.flags   = 0,
5559		.prog    = prog,
5560		.extack  = extack,
5561	};
5562	int err;
5563
5564	ASSERT_RTNL();
5565
5566	if (!bond_xdp_check(bond))
 
 
5567		return -EOPNOTSUPP;
 
5568
5569	old_prog = bond->xdp_prog;
5570	bond->xdp_prog = prog;
5571
5572	bond_for_each_slave(bond, slave, iter) {
5573		struct net_device *slave_dev = slave->dev;
5574
5575		if (!slave_dev->netdev_ops->ndo_bpf ||
5576		    !slave_dev->netdev_ops->ndo_xdp_xmit) {
5577			SLAVE_NL_ERR(dev, slave_dev, extack,
5578				     "Slave device does not support XDP");
5579			err = -EOPNOTSUPP;
5580			goto err;
5581		}
5582
5583		if (dev_xdp_prog_count(slave_dev) > 0) {
5584			SLAVE_NL_ERR(dev, slave_dev, extack,
5585				     "Slave has XDP program loaded, please unload before enslaving");
5586			err = -EOPNOTSUPP;
5587			goto err;
5588		}
5589
5590		err = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp);
5591		if (err < 0) {
5592			/* ndo_bpf() sets extack error message */
5593			slave_err(dev, slave_dev, "Error %d calling ndo_bpf\n", err);
5594			goto err;
5595		}
5596		if (prog)
5597			bpf_prog_inc(prog);
5598	}
5599
5600	if (prog) {
5601		static_branch_inc(&bpf_master_redirect_enabled_key);
5602	} else if (old_prog) {
5603		bpf_prog_put(old_prog);
5604		static_branch_dec(&bpf_master_redirect_enabled_key);
5605	}
5606
5607	return 0;
5608
5609err:
5610	/* unwind the program changes */
5611	bond->xdp_prog = old_prog;
5612	xdp.prog = old_prog;
5613	xdp.extack = NULL; /* do not overwrite original error */
5614
5615	bond_for_each_slave(bond, rollback_slave, iter) {
5616		struct net_device *slave_dev = rollback_slave->dev;
5617		int err_unwind;
5618
5619		if (slave == rollback_slave)
5620			break;
5621
5622		err_unwind = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp);
5623		if (err_unwind < 0)
5624			slave_err(dev, slave_dev,
5625				  "Error %d when unwinding XDP program change\n", err_unwind);
5626		else if (xdp.prog)
5627			bpf_prog_inc(xdp.prog);
5628	}
5629	return err;
5630}
5631
5632static int bond_xdp(struct net_device *dev, struct netdev_bpf *xdp)
5633{
5634	switch (xdp->command) {
5635	case XDP_SETUP_PROG:
5636		return bond_xdp_set(dev, xdp->prog, xdp->extack);
5637	default:
5638		return -EINVAL;
5639	}
5640}
5641
5642static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed)
5643{
5644	if (speed == 0 || speed == SPEED_UNKNOWN)
5645		speed = slave->speed;
5646	else
5647		speed = min(speed, slave->speed);
5648
5649	return speed;
5650}
5651
5652/* Set the BOND_PHC_INDEX flag to notify user space */
5653static int bond_set_phc_index_flag(struct kernel_hwtstamp_config *kernel_cfg)
5654{
5655	struct ifreq *ifr = kernel_cfg->ifr;
5656	struct hwtstamp_config cfg;
5657
5658	if (kernel_cfg->copied_to_user) {
5659		/* Lower device has a legacy implementation */
5660		if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
5661			return -EFAULT;
5662
5663		cfg.flags |= HWTSTAMP_FLAG_BONDED_PHC_INDEX;
5664		if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)))
5665			return -EFAULT;
5666	} else {
5667		kernel_cfg->flags |= HWTSTAMP_FLAG_BONDED_PHC_INDEX;
5668	}
5669
5670	return 0;
5671}
5672
5673static int bond_hwtstamp_get(struct net_device *dev,
5674			     struct kernel_hwtstamp_config *cfg)
5675{
5676	struct bonding *bond = netdev_priv(dev);
5677	struct net_device *real_dev;
5678	int err;
5679
5680	real_dev = bond_option_active_slave_get_rcu(bond);
5681	if (!real_dev)
5682		return -EOPNOTSUPP;
5683
5684	err = generic_hwtstamp_get_lower(real_dev, cfg);
5685	if (err)
5686		return err;
5687
5688	return bond_set_phc_index_flag(cfg);
5689}
5690
5691static int bond_hwtstamp_set(struct net_device *dev,
5692			     struct kernel_hwtstamp_config *cfg,
5693			     struct netlink_ext_ack *extack)
5694{
5695	struct bonding *bond = netdev_priv(dev);
5696	struct net_device *real_dev;
5697	int err;
5698
5699	if (!(cfg->flags & HWTSTAMP_FLAG_BONDED_PHC_INDEX))
5700		return -EOPNOTSUPP;
5701
5702	real_dev = bond_option_active_slave_get_rcu(bond);
5703	if (!real_dev)
5704		return -EOPNOTSUPP;
5705
5706	err = generic_hwtstamp_set_lower(real_dev, cfg, extack);
5707	if (err)
5708		return err;
5709
5710	return bond_set_phc_index_flag(cfg);
5711}
5712
5713static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
5714					   struct ethtool_link_ksettings *cmd)
5715{
5716	struct bonding *bond = netdev_priv(bond_dev);
5717	struct list_head *iter;
5718	struct slave *slave;
5719	u32 speed = 0;
5720
5721	cmd->base.duplex = DUPLEX_UNKNOWN;
5722	cmd->base.port = PORT_OTHER;
5723
5724	/* Since bond_slave_can_tx returns false for all inactive or down slaves, we
5725	 * do not need to check mode.  Though link speed might not represent
5726	 * the true receive or transmit bandwidth (not all modes are symmetric)
5727	 * this is an accurate maximum.
5728	 */
5729	bond_for_each_slave(bond, slave, iter) {
5730		if (bond_slave_can_tx(slave)) {
5731			bond_update_speed_duplex(slave);
5732			if (slave->speed != SPEED_UNKNOWN) {
5733				if (BOND_MODE(bond) == BOND_MODE_BROADCAST)
5734					speed = bond_mode_bcast_speed(slave,
5735								      speed);
5736				else
5737					speed += slave->speed;
5738			}
5739			if (cmd->base.duplex == DUPLEX_UNKNOWN &&
5740			    slave->duplex != DUPLEX_UNKNOWN)
5741				cmd->base.duplex = slave->duplex;
5742		}
5743	}
5744	cmd->base.speed = speed ? : SPEED_UNKNOWN;
5745
5746	return 0;
5747}
5748
5749static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
5750				     struct ethtool_drvinfo *drvinfo)
5751{
5752	strscpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
5753	snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
5754		 BOND_ABI_VERSION);
5755}
5756
5757static int bond_ethtool_get_ts_info(struct net_device *bond_dev,
5758				    struct ethtool_ts_info *info)
5759{
5760	struct bonding *bond = netdev_priv(bond_dev);
5761	struct ethtool_ts_info ts_info;
5762	struct net_device *real_dev;
5763	bool sw_tx_support = false;
5764	struct list_head *iter;
5765	struct slave *slave;
5766	int ret = 0;
5767
5768	rcu_read_lock();
5769	real_dev = bond_option_active_slave_get_rcu(bond);
5770	dev_hold(real_dev);
5771	rcu_read_unlock();
5772
5773	if (real_dev) {
5774		ret = ethtool_get_ts_info_by_layer(real_dev, info);
5775	} else {
5776		/* Check if all slaves support software tx timestamping */
5777		rcu_read_lock();
5778		bond_for_each_slave_rcu(bond, slave, iter) {
5779			ret = ethtool_get_ts_info_by_layer(slave->dev, &ts_info);
5780			if (!ret && (ts_info.so_timestamping & SOF_TIMESTAMPING_TX_SOFTWARE)) {
5781				sw_tx_support = true;
5782				continue;
5783			}
5784
5785			sw_tx_support = false;
5786			break;
5787		}
5788		rcu_read_unlock();
5789	}
5790
5791	if (sw_tx_support)
5792		info->so_timestamping |= SOF_TIMESTAMPING_TX_SOFTWARE;
5793
5794	dev_put(real_dev);
5795	return ret;
5796}
5797
5798static const struct ethtool_ops bond_ethtool_ops = {
5799	.get_drvinfo		= bond_ethtool_get_drvinfo,
5800	.get_link		= ethtool_op_get_link,
5801	.get_link_ksettings	= bond_ethtool_get_link_ksettings,
5802	.get_ts_info		= bond_ethtool_get_ts_info,
5803};
5804
5805static const struct net_device_ops bond_netdev_ops = {
5806	.ndo_init		= bond_init,
5807	.ndo_uninit		= bond_uninit,
5808	.ndo_open		= bond_open,
5809	.ndo_stop		= bond_close,
5810	.ndo_start_xmit		= bond_start_xmit,
5811	.ndo_select_queue	= bond_select_queue,
5812	.ndo_get_stats64	= bond_get_stats,
5813	.ndo_eth_ioctl		= bond_eth_ioctl,
5814	.ndo_siocbond		= bond_do_ioctl,
5815	.ndo_siocdevprivate	= bond_siocdevprivate,
5816	.ndo_change_rx_flags	= bond_change_rx_flags,
5817	.ndo_set_rx_mode	= bond_set_rx_mode,
5818	.ndo_change_mtu		= bond_change_mtu,
5819	.ndo_set_mac_address	= bond_set_mac_address,
5820	.ndo_neigh_setup	= bond_neigh_setup,
5821	.ndo_vlan_rx_add_vid	= bond_vlan_rx_add_vid,
5822	.ndo_vlan_rx_kill_vid	= bond_vlan_rx_kill_vid,
5823#ifdef CONFIG_NET_POLL_CONTROLLER
5824	.ndo_netpoll_setup	= bond_netpoll_setup,
5825	.ndo_netpoll_cleanup	= bond_netpoll_cleanup,
5826	.ndo_poll_controller	= bond_poll_controller,
5827#endif
5828	.ndo_add_slave		= bond_enslave,
5829	.ndo_del_slave		= bond_release,
5830	.ndo_fix_features	= bond_fix_features,
5831	.ndo_features_check	= passthru_features_check,
5832	.ndo_get_xmit_slave	= bond_xmit_get_slave,
5833	.ndo_sk_get_lower_dev	= bond_sk_get_lower_dev,
5834	.ndo_bpf		= bond_xdp,
5835	.ndo_xdp_xmit           = bond_xdp_xmit,
5836	.ndo_xdp_get_xmit_slave = bond_xdp_get_xmit_slave,
5837	.ndo_hwtstamp_get	= bond_hwtstamp_get,
5838	.ndo_hwtstamp_set	= bond_hwtstamp_set,
5839};
5840
5841static const struct device_type bond_type = {
5842	.name = "bond",
5843};
5844
5845static void bond_destructor(struct net_device *bond_dev)
5846{
5847	struct bonding *bond = netdev_priv(bond_dev);
5848
5849	if (bond->wq)
5850		destroy_workqueue(bond->wq);
5851
5852	free_percpu(bond->rr_tx_counter);
5853}
5854
5855void bond_setup(struct net_device *bond_dev)
5856{
5857	struct bonding *bond = netdev_priv(bond_dev);
5858
5859	spin_lock_init(&bond->mode_lock);
5860	bond->params = bonding_defaults;
5861
5862	/* Initialize pointers */
5863	bond->dev = bond_dev;
5864
5865	/* Initialize the device entry points */
5866	ether_setup(bond_dev);
5867	bond_dev->max_mtu = ETH_MAX_MTU;
5868	bond_dev->netdev_ops = &bond_netdev_ops;
5869	bond_dev->ethtool_ops = &bond_ethtool_ops;
5870
5871	bond_dev->needs_free_netdev = true;
5872	bond_dev->priv_destructor = bond_destructor;
5873
5874	SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
5875
5876	/* Initialize the device options */
5877	bond_dev->flags |= IFF_MASTER;
5878	bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
5879	bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
5880
5881#ifdef CONFIG_XFRM_OFFLOAD
5882	/* set up xfrm device ops (only supported in active-backup right now) */
5883	bond_dev->xfrmdev_ops = &bond_xfrmdev_ops;
5884	INIT_LIST_HEAD(&bond->ipsec_list);
5885	spin_lock_init(&bond->ipsec_lock);
5886#endif /* CONFIG_XFRM_OFFLOAD */
5887
5888	/* don't acquire bond device's netif_tx_lock when transmitting */
5889	bond_dev->features |= NETIF_F_LLTX;
 
 
 
5890
5891	/* By default, we declare the bond to be fully
5892	 * VLAN hardware accelerated capable. Special
5893	 * care is taken in the various xmit functions
5894	 * when there are slaves that are not hw accel
5895	 * capable
5896	 */
5897
5898	/* Don't allow bond devices to change network namespaces. */
5899	bond_dev->features |= NETIF_F_NETNS_LOCAL;
5900
5901	bond_dev->hw_features = BOND_VLAN_FEATURES |
5902				NETIF_F_HW_VLAN_CTAG_RX |
5903				NETIF_F_HW_VLAN_CTAG_FILTER |
5904				NETIF_F_HW_VLAN_STAG_RX |
5905				NETIF_F_HW_VLAN_STAG_FILTER;
5906
5907	bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
5908	bond_dev->features |= bond_dev->hw_features;
5909	bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
 
5910#ifdef CONFIG_XFRM_OFFLOAD
5911	bond_dev->hw_features |= BOND_XFRM_FEATURES;
5912	/* Only enable XFRM features if this is an active-backup config */
5913	if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
5914		bond_dev->features |= BOND_XFRM_FEATURES;
5915#endif /* CONFIG_XFRM_OFFLOAD */
5916}
5917
5918/* Destroy a bonding device.
5919 * Must be under rtnl_lock when this function is called.
5920 */
5921static void bond_uninit(struct net_device *bond_dev)
5922{
5923	struct bonding *bond = netdev_priv(bond_dev);
5924	struct list_head *iter;
5925	struct slave *slave;
5926
5927	bond_netpoll_cleanup(bond_dev);
5928
5929	/* Release the bonded slaves */
5930	bond_for_each_slave(bond, slave, iter)
5931		__bond_release_one(bond_dev, slave->dev, true, true);
5932	netdev_info(bond_dev, "Released all slaves\n");
5933
 
 
 
 
5934	bond_set_slave_arr(bond, NULL, NULL);
5935
5936	list_del(&bond->bond_list);
5937
5938	bond_debug_unregister(bond);
5939}
5940
5941/*------------------------- Module initialization ---------------------------*/
5942
5943static int __init bond_check_params(struct bond_params *params)
5944{
5945	int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
5946	struct bond_opt_value newval;
5947	const struct bond_opt_value *valptr;
5948	int arp_all_targets_value = 0;
5949	u16 ad_actor_sys_prio = 0;
5950	u16 ad_user_port_key = 0;
5951	__be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
5952	int arp_ip_count;
5953	int bond_mode	= BOND_MODE_ROUNDROBIN;
5954	int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
5955	int lacp_fast = 0;
5956	int tlb_dynamic_lb;
5957
5958	/* Convert string parameters. */
5959	if (mode) {
5960		bond_opt_initstr(&newval, mode);
5961		valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
5962		if (!valptr) {
5963			pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
5964			return -EINVAL;
5965		}
5966		bond_mode = valptr->value;
5967	}
5968
5969	if (xmit_hash_policy) {
5970		if (bond_mode == BOND_MODE_ROUNDROBIN ||
5971		    bond_mode == BOND_MODE_ACTIVEBACKUP ||
5972		    bond_mode == BOND_MODE_BROADCAST) {
5973			pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
5974				bond_mode_name(bond_mode));
5975		} else {
5976			bond_opt_initstr(&newval, xmit_hash_policy);
5977			valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
5978						&newval);
5979			if (!valptr) {
5980				pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
5981				       xmit_hash_policy);
5982				return -EINVAL;
5983			}
5984			xmit_hashtype = valptr->value;
5985		}
5986	}
5987
5988	if (lacp_rate) {
5989		if (bond_mode != BOND_MODE_8023AD) {
5990			pr_info("lacp_rate param is irrelevant in mode %s\n",
5991				bond_mode_name(bond_mode));
5992		} else {
5993			bond_opt_initstr(&newval, lacp_rate);
5994			valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
5995						&newval);
5996			if (!valptr) {
5997				pr_err("Error: Invalid lacp rate \"%s\"\n",
5998				       lacp_rate);
5999				return -EINVAL;
6000			}
6001			lacp_fast = valptr->value;
6002		}
6003	}
6004
6005	if (ad_select) {
6006		bond_opt_initstr(&newval, ad_select);
6007		valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
6008					&newval);
6009		if (!valptr) {
6010			pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
6011			return -EINVAL;
6012		}
6013		params->ad_select = valptr->value;
6014		if (bond_mode != BOND_MODE_8023AD)
6015			pr_warn("ad_select param only affects 802.3ad mode\n");
6016	} else {
6017		params->ad_select = BOND_AD_STABLE;
6018	}
6019
6020	if (max_bonds < 0) {
6021		pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
6022			max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
6023		max_bonds = BOND_DEFAULT_MAX_BONDS;
6024	}
6025
6026	if (miimon < 0) {
6027		pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
6028			miimon, INT_MAX);
6029		miimon = 0;
6030	}
6031
6032	if (updelay < 0) {
6033		pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
6034			updelay, INT_MAX);
6035		updelay = 0;
6036	}
6037
6038	if (downdelay < 0) {
6039		pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
6040			downdelay, INT_MAX);
6041		downdelay = 0;
6042	}
6043
6044	if ((use_carrier != 0) && (use_carrier != 1)) {
6045		pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
6046			use_carrier);
6047		use_carrier = 1;
6048	}
6049
6050	if (num_peer_notif < 0 || num_peer_notif > 255) {
6051		pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
6052			num_peer_notif);
6053		num_peer_notif = 1;
6054	}
6055
6056	/* reset values for 802.3ad/TLB/ALB */
6057	if (!bond_mode_uses_arp(bond_mode)) {
6058		if (!miimon) {
6059			pr_warn("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n");
6060			pr_warn("Forcing miimon to 100msec\n");
6061			miimon = BOND_DEFAULT_MIIMON;
6062		}
6063	}
6064
6065	if (tx_queues < 1 || tx_queues > 255) {
6066		pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
6067			tx_queues, BOND_DEFAULT_TX_QUEUES);
6068		tx_queues = BOND_DEFAULT_TX_QUEUES;
6069	}
6070
6071	if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
6072		pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
6073			all_slaves_active);
6074		all_slaves_active = 0;
6075	}
6076
6077	if (resend_igmp < 0 || resend_igmp > 255) {
6078		pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
6079			resend_igmp, BOND_DEFAULT_RESEND_IGMP);
6080		resend_igmp = BOND_DEFAULT_RESEND_IGMP;
6081	}
6082
6083	bond_opt_initval(&newval, packets_per_slave);
6084	if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
6085		pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
6086			packets_per_slave, USHRT_MAX);
6087		packets_per_slave = 1;
6088	}
6089
6090	if (bond_mode == BOND_MODE_ALB) {
6091		pr_notice("In ALB mode you might experience client disconnections upon reconnection of a link if the bonding module updelay parameter (%d msec) is incompatible with the forwarding delay time of the switch\n",
6092			  updelay);
6093	}
6094
6095	if (!miimon) {
6096		if (updelay || downdelay) {
6097			/* just warn the user the up/down delay will have
6098			 * no effect since miimon is zero...
6099			 */
6100			pr_warn("Warning: miimon module parameter not set and updelay (%d) or downdelay (%d) module parameter is set; updelay and downdelay have no effect unless miimon is set\n",
6101				updelay, downdelay);
6102		}
6103	} else {
6104		/* don't allow arp monitoring */
6105		if (arp_interval) {
6106			pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
6107				miimon, arp_interval);
6108			arp_interval = 0;
6109		}
6110
6111		if ((updelay % miimon) != 0) {
6112			pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
6113				updelay, miimon, (updelay / miimon) * miimon);
6114		}
6115
6116		updelay /= miimon;
6117
6118		if ((downdelay % miimon) != 0) {
6119			pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
6120				downdelay, miimon,
6121				(downdelay / miimon) * miimon);
6122		}
6123
6124		downdelay /= miimon;
6125	}
6126
6127	if (arp_interval < 0) {
6128		pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
6129			arp_interval, INT_MAX);
6130		arp_interval = 0;
6131	}
6132
6133	for (arp_ip_count = 0, i = 0;
6134	     (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
6135		__be32 ip;
6136
6137		/* not a complete check, but good enough to catch mistakes */
6138		if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
6139		    !bond_is_ip_target_ok(ip)) {
6140			pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
6141				arp_ip_target[i]);
6142			arp_interval = 0;
6143		} else {
6144			if (bond_get_targets_ip(arp_target, ip) == -1)
6145				arp_target[arp_ip_count++] = ip;
6146			else
6147				pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
6148					&ip);
6149		}
6150	}
6151
6152	if (arp_interval && !arp_ip_count) {
6153		/* don't allow arping if no arp_ip_target given... */
6154		pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
6155			arp_interval);
6156		arp_interval = 0;
6157	}
6158
6159	if (arp_validate) {
6160		if (!arp_interval) {
6161			pr_err("arp_validate requires arp_interval\n");
6162			return -EINVAL;
6163		}
6164
6165		bond_opt_initstr(&newval, arp_validate);
6166		valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
6167					&newval);
6168		if (!valptr) {
6169			pr_err("Error: invalid arp_validate \"%s\"\n",
6170			       arp_validate);
6171			return -EINVAL;
6172		}
6173		arp_validate_value = valptr->value;
6174	} else {
6175		arp_validate_value = 0;
6176	}
6177
6178	if (arp_all_targets) {
6179		bond_opt_initstr(&newval, arp_all_targets);
6180		valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
6181					&newval);
6182		if (!valptr) {
6183			pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
6184			       arp_all_targets);
6185			arp_all_targets_value = 0;
6186		} else {
6187			arp_all_targets_value = valptr->value;
6188		}
6189	}
6190
6191	if (miimon) {
6192		pr_info("MII link monitoring set to %d ms\n", miimon);
6193	} else if (arp_interval) {
6194		valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
6195					  arp_validate_value);
6196		pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
6197			arp_interval, valptr->string, arp_ip_count);
6198
6199		for (i = 0; i < arp_ip_count; i++)
6200			pr_cont(" %s", arp_ip_target[i]);
6201
6202		pr_cont("\n");
6203
6204	} else if (max_bonds) {
6205		/* miimon and arp_interval not set, we need one so things
6206		 * work as expected, see bonding.txt for details
6207		 */
6208		pr_debug("Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details\n");
6209	}
6210
6211	if (primary && !bond_mode_uses_primary(bond_mode)) {
6212		/* currently, using a primary only makes sense
6213		 * in active backup, TLB or ALB modes
6214		 */
6215		pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
6216			primary, bond_mode_name(bond_mode));
6217		primary = NULL;
6218	}
6219
6220	if (primary && primary_reselect) {
6221		bond_opt_initstr(&newval, primary_reselect);
6222		valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
6223					&newval);
6224		if (!valptr) {
6225			pr_err("Error: Invalid primary_reselect \"%s\"\n",
6226			       primary_reselect);
6227			return -EINVAL;
6228		}
6229		primary_reselect_value = valptr->value;
6230	} else {
6231		primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
6232	}
6233
6234	if (fail_over_mac) {
6235		bond_opt_initstr(&newval, fail_over_mac);
6236		valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
6237					&newval);
6238		if (!valptr) {
6239			pr_err("Error: invalid fail_over_mac \"%s\"\n",
6240			       fail_over_mac);
6241			return -EINVAL;
6242		}
6243		fail_over_mac_value = valptr->value;
6244		if (bond_mode != BOND_MODE_ACTIVEBACKUP)
6245			pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
6246	} else {
6247		fail_over_mac_value = BOND_FOM_NONE;
6248	}
6249
6250	bond_opt_initstr(&newval, "default");
6251	valptr = bond_opt_parse(
6252			bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
6253				     &newval);
6254	if (!valptr) {
6255		pr_err("Error: No ad_actor_sys_prio default value");
6256		return -EINVAL;
6257	}
6258	ad_actor_sys_prio = valptr->value;
6259
6260	valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
6261				&newval);
6262	if (!valptr) {
6263		pr_err("Error: No ad_user_port_key default value");
6264		return -EINVAL;
6265	}
6266	ad_user_port_key = valptr->value;
6267
6268	bond_opt_initstr(&newval, "default");
6269	valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);
6270	if (!valptr) {
6271		pr_err("Error: No tlb_dynamic_lb default value");
6272		return -EINVAL;
6273	}
6274	tlb_dynamic_lb = valptr->value;
6275
6276	if (lp_interval == 0) {
6277		pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
6278			INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
6279		lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
6280	}
6281
6282	/* fill params struct with the proper values */
6283	params->mode = bond_mode;
6284	params->xmit_policy = xmit_hashtype;
6285	params->miimon = miimon;
6286	params->num_peer_notif = num_peer_notif;
6287	params->arp_interval = arp_interval;
6288	params->arp_validate = arp_validate_value;
6289	params->arp_all_targets = arp_all_targets_value;
6290	params->missed_max = 2;
6291	params->updelay = updelay;
6292	params->downdelay = downdelay;
6293	params->peer_notif_delay = 0;
6294	params->use_carrier = use_carrier;
6295	params->lacp_active = 1;
6296	params->lacp_fast = lacp_fast;
6297	params->primary[0] = 0;
6298	params->primary_reselect = primary_reselect_value;
6299	params->fail_over_mac = fail_over_mac_value;
6300	params->tx_queues = tx_queues;
6301	params->all_slaves_active = all_slaves_active;
6302	params->resend_igmp = resend_igmp;
6303	params->min_links = min_links;
6304	params->lp_interval = lp_interval;
6305	params->packets_per_slave = packets_per_slave;
6306	params->tlb_dynamic_lb = tlb_dynamic_lb;
6307	params->ad_actor_sys_prio = ad_actor_sys_prio;
6308	eth_zero_addr(params->ad_actor_system);
6309	params->ad_user_port_key = ad_user_port_key;
6310	params->coupled_control = 1;
6311	if (packets_per_slave > 0) {
6312		params->reciprocal_packets_per_slave =
6313			reciprocal_value(packets_per_slave);
6314	} else {
6315		/* reciprocal_packets_per_slave is unused if
6316		 * packets_per_slave is 0 or 1, just initialize it
6317		 */
6318		params->reciprocal_packets_per_slave =
6319			(struct reciprocal_value) { 0 };
6320	}
6321
6322	if (primary)
6323		strscpy_pad(params->primary, primary, sizeof(params->primary));
6324
6325	memcpy(params->arp_targets, arp_target, sizeof(arp_target));
6326#if IS_ENABLED(CONFIG_IPV6)
6327	memset(params->ns_targets, 0, sizeof(struct in6_addr) * BOND_MAX_NS_TARGETS);
6328#endif
6329
6330	return 0;
6331}
6332
6333/* Called from registration process */
6334static int bond_init(struct net_device *bond_dev)
6335{
6336	struct bonding *bond = netdev_priv(bond_dev);
6337	struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
6338
6339	netdev_dbg(bond_dev, "Begin bond_init\n");
6340
6341	bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
 
6342	if (!bond->wq)
6343		return -ENOMEM;
6344
6345	bond->notifier_ctx = false;
6346
6347	spin_lock_init(&bond->stats_lock);
6348	netdev_lockdep_set_classes(bond_dev);
6349
6350	list_add_tail(&bond->bond_list, &bn->dev_list);
6351
6352	bond_prepare_sysfs_group(bond);
6353
6354	bond_debug_register(bond);
6355
6356	/* Ensure valid dev_addr */
6357	if (is_zero_ether_addr(bond_dev->dev_addr) &&
6358	    bond_dev->addr_assign_type == NET_ADDR_PERM)
6359		eth_hw_addr_random(bond_dev);
6360
6361	return 0;
6362}
6363
6364unsigned int bond_get_num_tx_queues(void)
6365{
6366	return tx_queues;
6367}
6368
6369/* Create a new bond based on the specified name and bonding parameters.
6370 * If name is NULL, obtain a suitable "bond%d" name for us.
6371 * Caller must NOT hold rtnl_lock; we need to release it here before we
6372 * set up our sysfs entries.
6373 */
6374int bond_create(struct net *net, const char *name)
6375{
6376	struct net_device *bond_dev;
6377	struct bonding *bond;
6378	int res = -ENOMEM;
6379
6380	rtnl_lock();
6381
6382	bond_dev = alloc_netdev_mq(sizeof(struct bonding),
6383				   name ? name : "bond%d", NET_NAME_UNKNOWN,
6384				   bond_setup, tx_queues);
6385	if (!bond_dev)
6386		goto out;
6387
6388	bond = netdev_priv(bond_dev);
6389	dev_net_set(bond_dev, net);
6390	bond_dev->rtnl_link_ops = &bond_link_ops;
6391
6392	res = register_netdevice(bond_dev);
6393	if (res < 0) {
6394		free_netdev(bond_dev);
6395		goto out;
6396	}
6397
6398	netif_carrier_off(bond_dev);
6399
6400	bond_work_init_all(bond);
6401
6402out:
6403	rtnl_unlock();
6404	return res;
6405}
6406
6407static int __net_init bond_net_init(struct net *net)
6408{
6409	struct bond_net *bn = net_generic(net, bond_net_id);
6410
6411	bn->net = net;
6412	INIT_LIST_HEAD(&bn->dev_list);
6413
6414	bond_create_proc_dir(bn);
6415	bond_create_sysfs(bn);
6416
6417	return 0;
6418}
6419
6420/* According to commit 69b0216ac255 ("bonding: fix bonding_masters
6421 * race condition in bond unloading") we need to remove sysfs files
6422 * before we remove our devices (done later in bond_net_exit_batch_rtnl())
6423 */
6424static void __net_exit bond_net_pre_exit(struct net *net)
6425{
6426	struct bond_net *bn = net_generic(net, bond_net_id);
6427
6428	bond_destroy_sysfs(bn);
6429}
6430
6431static void __net_exit bond_net_exit_batch_rtnl(struct list_head *net_list,
6432						struct list_head *dev_kill_list)
6433{
6434	struct bond_net *bn;
6435	struct net *net;
6436
6437	/* Kill off any bonds created after unregistering bond rtnl ops */
6438	list_for_each_entry(net, net_list, exit_list) {
6439		struct bonding *bond, *tmp_bond;
6440
6441		bn = net_generic(net, bond_net_id);
6442		list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
6443			unregister_netdevice_queue(bond->dev, dev_kill_list);
6444	}
6445}
6446
6447/* According to commit 23fa5c2caae0 ("bonding: destroy proc directory
6448 * only after all bonds are gone") bond_destroy_proc_dir() is called
6449 * after bond_net_exit_batch_rtnl() has completed.
6450 */
6451static void __net_exit bond_net_exit_batch(struct list_head *net_list)
6452{
6453	struct bond_net *bn;
6454	struct net *net;
6455
6456	list_for_each_entry(net, net_list, exit_list) {
6457		bn = net_generic(net, bond_net_id);
6458		bond_destroy_proc_dir(bn);
6459	}
6460}
6461
6462static struct pernet_operations bond_net_ops = {
6463	.init = bond_net_init,
6464	.pre_exit = bond_net_pre_exit,
6465	.exit_batch_rtnl = bond_net_exit_batch_rtnl,
6466	.exit_batch = bond_net_exit_batch,
6467	.id   = &bond_net_id,
6468	.size = sizeof(struct bond_net),
6469};
6470
6471static int __init bonding_init(void)
6472{
6473	int i;
6474	int res;
6475
6476	res = bond_check_params(&bonding_defaults);
6477	if (res)
6478		goto out;
6479
 
 
6480	res = register_pernet_subsys(&bond_net_ops);
6481	if (res)
6482		goto out;
6483
6484	res = bond_netlink_init();
6485	if (res)
6486		goto err_link;
6487
6488	bond_create_debugfs();
6489
6490	for (i = 0; i < max_bonds; i++) {
6491		res = bond_create(&init_net, NULL);
6492		if (res)
6493			goto err;
6494	}
6495
6496	skb_flow_dissector_init(&flow_keys_bonding,
6497				flow_keys_bonding_keys,
6498				ARRAY_SIZE(flow_keys_bonding_keys));
6499
6500	register_netdevice_notifier(&bond_netdev_notifier);
6501out:
6502	return res;
6503err:
6504	bond_destroy_debugfs();
6505	bond_netlink_fini();
6506err_link:
6507	unregister_pernet_subsys(&bond_net_ops);
 
 
6508	goto out;
6509
6510}
6511
6512static void __exit bonding_exit(void)
6513{
6514	unregister_netdevice_notifier(&bond_netdev_notifier);
6515
6516	bond_destroy_debugfs();
6517
6518	bond_netlink_fini();
6519	unregister_pernet_subsys(&bond_net_ops);
 
 
6520
6521#ifdef CONFIG_NET_POLL_CONTROLLER
6522	/* Make sure we don't have an imbalance on our netpoll blocking */
6523	WARN_ON(atomic_read(&netpoll_block_tx));
6524#endif
6525}
6526
6527module_init(bonding_init);
6528module_exit(bonding_exit);
6529MODULE_LICENSE("GPL");
6530MODULE_DESCRIPTION(DRV_DESCRIPTION);
6531MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");