linux/drivers/net/bonding/bond_main.c
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   1/*
   2 * originally based on the dummy device.
   3 *
   4 * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
   5 * Licensed under the GPL. Based on dummy.c, and eql.c devices.
   6 *
   7 * bonding.c: an Ethernet Bonding driver
   8 *
   9 * This is useful to talk to a Cisco EtherChannel compatible equipment:
  10 *      Cisco 5500
  11 *      Sun Trunking (Solaris)
  12 *      Alteon AceDirector Trunks
  13 *      Linux Bonding
  14 *      and probably many L2 switches ...
  15 *
  16 * How it works:
  17 *    ifconfig bond0 ipaddress netmask up
  18 *      will setup a network device, with an ip address.  No mac address
  19 *      will be assigned at this time.  The hw mac address will come from
  20 *      the first slave bonded to the channel.  All slaves will then use
  21 *      this hw mac address.
  22 *
  23 *    ifconfig bond0 down
  24 *         will release all slaves, marking them as down.
  25 *
  26 *    ifenslave bond0 eth0
  27 *      will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
  28 *      a: be used as initial mac address
  29 *      b: if a hw mac address already is there, eth0's hw mac address
  30 *         will then be set from bond0.
  31 *
  32 */
  33
  34#include <linux/kernel.h>
  35#include <linux/module.h>
  36#include <linux/types.h>
  37#include <linux/fcntl.h>
  38#include <linux/interrupt.h>
  39#include <linux/ptrace.h>
  40#include <linux/ioport.h>
  41#include <linux/in.h>
  42#include <net/ip.h>
  43#include <linux/ip.h>
  44#include <linux/tcp.h>
  45#include <linux/udp.h>
  46#include <linux/slab.h>
  47#include <linux/string.h>
  48#include <linux/init.h>
  49#include <linux/timer.h>
  50#include <linux/socket.h>
  51#include <linux/ctype.h>
  52#include <linux/inet.h>
  53#include <linux/bitops.h>
  54#include <linux/io.h>
  55#include <asm/dma.h>
  56#include <linux/uaccess.h>
  57#include <linux/errno.h>
  58#include <linux/netdevice.h>
  59#include <linux/inetdevice.h>
  60#include <linux/igmp.h>
  61#include <linux/etherdevice.h>
  62#include <linux/skbuff.h>
  63#include <net/sock.h>
  64#include <linux/rtnetlink.h>
  65#include <linux/smp.h>
  66#include <linux/if_ether.h>
  67#include <net/arp.h>
  68#include <linux/mii.h>
  69#include <linux/ethtool.h>
  70#include <linux/if_vlan.h>
  71#include <linux/if_bonding.h>
  72#include <linux/jiffies.h>
  73#include <linux/preempt.h>
  74#include <net/route.h>
  75#include <net/net_namespace.h>
  76#include <net/netns/generic.h>
  77#include <net/pkt_sched.h>
  78#include <linux/rculist.h>
  79#include <net/flow_dissector.h>
  80#include <net/bonding.h>
  81#include <net/bond_3ad.h>
  82#include <net/bond_alb.h>
  83
  84#include "bonding_priv.h"
  85
  86/*---------------------------- Module parameters ----------------------------*/
  87
  88/* monitor all links that often (in milliseconds). <=0 disables monitoring */
  89
  90static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  91static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  92static int num_peer_notif = 1;
  93static int miimon;
  94static int updelay;
  95static int downdelay;
  96static int use_carrier  = 1;
  97static char *mode;
  98static char *primary;
  99static char *primary_reselect;
 100static char *lacp_rate;
 101static int min_links;
 102static char *ad_select;
 103static char *xmit_hash_policy;
 104static int arp_interval;
 105static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 106static char *arp_validate;
 107static char *arp_all_targets;
 108static char *fail_over_mac;
 109static int all_slaves_active;
 110static struct bond_params bonding_defaults;
 111static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 112static int packets_per_slave = 1;
 113static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
 114
 115module_param(max_bonds, int, 0);
 116MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 117module_param(tx_queues, int, 0);
 118MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 119module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 120MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 121                               "failover event (alias of num_unsol_na)");
 122module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 123MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 124                               "failover event (alias of num_grat_arp)");
 125module_param(miimon, int, 0);
 126MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 127module_param(updelay, int, 0);
 128MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 129module_param(downdelay, int, 0);
 130MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 131                            "in milliseconds");
 132module_param(use_carrier, int, 0);
 133MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 134                              "0 for off, 1 for on (default)");
 135module_param(mode, charp, 0);
 136MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 137                       "1 for active-backup, 2 for balance-xor, "
 138                       "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 139                       "6 for balance-alb");
 140module_param(primary, charp, 0);
 141MODULE_PARM_DESC(primary, "Primary network device to use");
 142module_param(primary_reselect, charp, 0);
 143MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 144                                   "once it comes up; "
 145                                   "0 for always (default), "
 146                                   "1 for only if speed of primary is "
 147                                   "better, "
 148                                   "2 for only on active slave "
 149                                   "failure");
 150module_param(lacp_rate, charp, 0);
 151MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 152                            "0 for slow, 1 for fast");
 153module_param(ad_select, charp, 0);
 154MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; "
 155                            "0 for stable (default), 1 for bandwidth, "
 156                            "2 for count");
 157module_param(min_links, int, 0);
 158MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 159
 160module_param(xmit_hash_policy, charp, 0);
 161MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; "
 162                                   "0 for layer 2 (default), 1 for layer 3+4, "
 163                                   "2 for layer 2+3, 3 for encap layer 2+3, "
 164                                   "4 for encap layer 3+4");
 165module_param(arp_interval, int, 0);
 166MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 167module_param_array(arp_ip_target, charp, NULL, 0);
 168MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 169module_param(arp_validate, charp, 0);
 170MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 171                               "0 for none (default), 1 for active, "
 172                               "2 for backup, 3 for all");
 173module_param(arp_all_targets, charp, 0);
 174MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
 175module_param(fail_over_mac, charp, 0);
 176MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 177                                "the same MAC; 0 for none (default), "
 178                                "1 for active, 2 for follow");
 179module_param(all_slaves_active, int, 0);
 180MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
 181                                     "by setting active flag for all slaves; "
 182                                     "0 for never (default), 1 for always.");
 183module_param(resend_igmp, int, 0);
 184MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 185                              "link failure");
 186module_param(packets_per_slave, int, 0);
 187MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
 188                                    "mode; 0 for a random slave, 1 packet per "
 189                                    "slave (default), >1 packets per slave.");
 190module_param(lp_interval, uint, 0);
 191MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
 192                              "the bonding driver sends learning packets to "
 193                              "each slaves peer switch. The default is 1.");
 194
 195/*----------------------------- Global variables ----------------------------*/
 196
 197#ifdef CONFIG_NET_POLL_CONTROLLER
 198atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 199#endif
 200
 201unsigned int bond_net_id __read_mostly;
 202
 203/*-------------------------- Forward declarations ---------------------------*/
 204
 205static int bond_init(struct net_device *bond_dev);
 206static void bond_uninit(struct net_device *bond_dev);
 207static void bond_get_stats(struct net_device *bond_dev,
 208                           struct rtnl_link_stats64 *stats);
 209static void bond_slave_arr_handler(struct work_struct *work);
 210static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
 211                                  int mod);
 212static void bond_netdev_notify_work(struct work_struct *work);
 213
 214/*---------------------------- General routines -----------------------------*/
 215
 216const char *bond_mode_name(int mode)
 217{
 218        static const char *names[] = {
 219                [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 220                [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 221                [BOND_MODE_XOR] = "load balancing (xor)",
 222                [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 223                [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 224                [BOND_MODE_TLB] = "transmit load balancing",
 225                [BOND_MODE_ALB] = "adaptive load balancing",
 226        };
 227
 228        if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
 229                return "unknown";
 230
 231        return names[mode];
 232}
 233
 234/*---------------------------------- VLAN -----------------------------------*/
 235
 236/**
 237 * bond_dev_queue_xmit - Prepare skb for xmit.
 238 *
 239 * @bond: bond device that got this skb for tx.
 240 * @skb: hw accel VLAN tagged skb to transmit
 241 * @slave_dev: slave that is supposed to xmit this skbuff
 242 */
 243void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 244                        struct net_device *slave_dev)
 245{
 246        skb->dev = slave_dev;
 247
 248        BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 249                     sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 250        skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
 251
 252        if (unlikely(netpoll_tx_running(bond->dev)))
 253                bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 254        else
 255                dev_queue_xmit(skb);
 256}
 257
 258/* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 259 * We don't protect the slave list iteration with a lock because:
 260 * a. This operation is performed in IOCTL context,
 261 * b. The operation is protected by the RTNL semaphore in the 8021q code,
 262 * c. Holding a lock with BH disabled while directly calling a base driver
 263 *    entry point is generally a BAD idea.
 264 *
 265 * The design of synchronization/protection for this operation in the 8021q
 266 * module is good for one or more VLAN devices over a single physical device
 267 * and cannot be extended for a teaming solution like bonding, so there is a
 268 * potential race condition here where a net device from the vlan group might
 269 * be referenced (either by a base driver or the 8021q code) while it is being
 270 * removed from the system. However, it turns out we're not making matters
 271 * worse, and if it works for regular VLAN usage it will work here too.
 272*/
 273
 274/**
 275 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 276 * @bond_dev: bonding net device that got called
 277 * @vid: vlan id being added
 278 */
 279static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
 280                                __be16 proto, u16 vid)
 281{
 282        struct bonding *bond = netdev_priv(bond_dev);
 283        struct slave *slave, *rollback_slave;
 284        struct list_head *iter;
 285        int res;
 286
 287        bond_for_each_slave(bond, slave, iter) {
 288                res = vlan_vid_add(slave->dev, proto, vid);
 289                if (res)
 290                        goto unwind;
 291        }
 292
 293        return 0;
 294
 295unwind:
 296        /* unwind to the slave that failed */
 297        bond_for_each_slave(bond, rollback_slave, iter) {
 298                if (rollback_slave == slave)
 299                        break;
 300
 301                vlan_vid_del(rollback_slave->dev, proto, vid);
 302        }
 303
 304        return res;
 305}
 306
 307/**
 308 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 309 * @bond_dev: bonding net device that got called
 310 * @vid: vlan id being removed
 311 */
 312static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 313                                 __be16 proto, u16 vid)
 314{
 315        struct bonding *bond = netdev_priv(bond_dev);
 316        struct list_head *iter;
 317        struct slave *slave;
 318
 319        bond_for_each_slave(bond, slave, iter)
 320                vlan_vid_del(slave->dev, proto, vid);
 321
 322        if (bond_is_lb(bond))
 323                bond_alb_clear_vlan(bond, vid);
 324
 325        return 0;
 326}
 327
 328/*------------------------------- Link status -------------------------------*/
 329
 330/* Set the carrier state for the master according to the state of its
 331 * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 332 * do special 802.3ad magic.
 333 *
 334 * Returns zero if carrier state does not change, nonzero if it does.
 335 */
 336int bond_set_carrier(struct bonding *bond)
 337{
 338        struct list_head *iter;
 339        struct slave *slave;
 340
 341        if (!bond_has_slaves(bond))
 342                goto down;
 343
 344        if (BOND_MODE(bond) == BOND_MODE_8023AD)
 345                return bond_3ad_set_carrier(bond);
 346
 347        bond_for_each_slave(bond, slave, iter) {
 348                if (slave->link == BOND_LINK_UP) {
 349                        if (!netif_carrier_ok(bond->dev)) {
 350                                netif_carrier_on(bond->dev);
 351                                return 1;
 352                        }
 353                        return 0;
 354                }
 355        }
 356
 357down:
 358        if (netif_carrier_ok(bond->dev)) {
 359                netif_carrier_off(bond->dev);
 360                return 1;
 361        }
 362        return 0;
 363}
 364
 365/* Get link speed and duplex from the slave's base driver
 366 * using ethtool. If for some reason the call fails or the
 367 * values are invalid, set speed and duplex to -1,
 368 * and return. Return 1 if speed or duplex settings are
 369 * UNKNOWN; 0 otherwise.
 370 */
 371static int bond_update_speed_duplex(struct slave *slave)
 372{
 373        struct net_device *slave_dev = slave->dev;
 374        struct ethtool_link_ksettings ecmd;
 375        int res;
 376
 377        slave->speed = SPEED_UNKNOWN;
 378        slave->duplex = DUPLEX_UNKNOWN;
 379
 380        res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
 381        if (res < 0)
 382                return 1;
 383        if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
 384                return 1;
 385        switch (ecmd.base.duplex) {
 386        case DUPLEX_FULL:
 387        case DUPLEX_HALF:
 388                break;
 389        default:
 390                return 1;
 391        }
 392
 393        slave->speed = ecmd.base.speed;
 394        slave->duplex = ecmd.base.duplex;
 395
 396        return 0;
 397}
 398
 399const char *bond_slave_link_status(s8 link)
 400{
 401        switch (link) {
 402        case BOND_LINK_UP:
 403                return "up";
 404        case BOND_LINK_FAIL:
 405                return "going down";
 406        case BOND_LINK_DOWN:
 407                return "down";
 408        case BOND_LINK_BACK:
 409                return "going back";
 410        default:
 411                return "unknown";
 412        }
 413}
 414
 415/* if <dev> supports MII link status reporting, check its link status.
 416 *
 417 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 418 * depending upon the setting of the use_carrier parameter.
 419 *
 420 * Return either BMSR_LSTATUS, meaning that the link is up (or we
 421 * can't tell and just pretend it is), or 0, meaning that the link is
 422 * down.
 423 *
 424 * If reporting is non-zero, instead of faking link up, return -1 if
 425 * both ETHTOOL and MII ioctls fail (meaning the device does not
 426 * support them).  If use_carrier is set, return whatever it says.
 427 * It'd be nice if there was a good way to tell if a driver supports
 428 * netif_carrier, but there really isn't.
 429 */
 430static int bond_check_dev_link(struct bonding *bond,
 431                               struct net_device *slave_dev, int reporting)
 432{
 433        const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 434        int (*ioctl)(struct net_device *, struct ifreq *, int);
 435        struct ifreq ifr;
 436        struct mii_ioctl_data *mii;
 437
 438        if (!reporting && !netif_running(slave_dev))
 439                return 0;
 440
 441        if (bond->params.use_carrier)
 442                return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 443
 444        /* Try to get link status using Ethtool first. */
 445        if (slave_dev->ethtool_ops->get_link)
 446                return slave_dev->ethtool_ops->get_link(slave_dev) ?
 447                        BMSR_LSTATUS : 0;
 448
 449        /* Ethtool can't be used, fallback to MII ioctls. */
 450        ioctl = slave_ops->ndo_do_ioctl;
 451        if (ioctl) {
 452                /* TODO: set pointer to correct ioctl on a per team member
 453                 *       bases to make this more efficient. that is, once
 454                 *       we determine the correct ioctl, we will always
 455                 *       call it and not the others for that team
 456                 *       member.
 457                 */
 458
 459                /* We cannot assume that SIOCGMIIPHY will also read a
 460                 * register; not all network drivers (e.g., e100)
 461                 * support that.
 462                 */
 463
 464                /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 465                strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 466                mii = if_mii(&ifr);
 467                if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 468                        mii->reg_num = MII_BMSR;
 469                        if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
 470                                return mii->val_out & BMSR_LSTATUS;
 471                }
 472        }
 473
 474        /* If reporting, report that either there's no dev->do_ioctl,
 475         * or both SIOCGMIIREG and get_link failed (meaning that we
 476         * cannot report link status).  If not reporting, pretend
 477         * we're ok.
 478         */
 479        return reporting ? -1 : BMSR_LSTATUS;
 480}
 481
 482/*----------------------------- Multicast list ------------------------------*/
 483
 484/* Push the promiscuity flag down to appropriate slaves */
 485static int bond_set_promiscuity(struct bonding *bond, int inc)
 486{
 487        struct list_head *iter;
 488        int err = 0;
 489
 490        if (bond_uses_primary(bond)) {
 491                struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 492
 493                if (curr_active)
 494                        err = dev_set_promiscuity(curr_active->dev, inc);
 495        } else {
 496                struct slave *slave;
 497
 498                bond_for_each_slave(bond, slave, iter) {
 499                        err = dev_set_promiscuity(slave->dev, inc);
 500                        if (err)
 501                                return err;
 502                }
 503        }
 504        return err;
 505}
 506
 507/* Push the allmulti flag down to all slaves */
 508static int bond_set_allmulti(struct bonding *bond, int inc)
 509{
 510        struct list_head *iter;
 511        int err = 0;
 512
 513        if (bond_uses_primary(bond)) {
 514                struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 515
 516                if (curr_active)
 517                        err = dev_set_allmulti(curr_active->dev, inc);
 518        } else {
 519                struct slave *slave;
 520
 521                bond_for_each_slave(bond, slave, iter) {
 522                        err = dev_set_allmulti(slave->dev, inc);
 523                        if (err)
 524                                return err;
 525                }
 526        }
 527        return err;
 528}
 529
 530/* Retrieve the list of registered multicast addresses for the bonding
 531 * device and retransmit an IGMP JOIN request to the current active
 532 * slave.
 533 */
 534static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 535{
 536        struct bonding *bond = container_of(work, struct bonding,
 537                                            mcast_work.work);
 538
 539        if (!rtnl_trylock()) {
 540                queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 541                return;
 542        }
 543        call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
 544
 545        if (bond->igmp_retrans > 1) {
 546                bond->igmp_retrans--;
 547                queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 548        }
 549        rtnl_unlock();
 550}
 551
 552/* Flush bond's hardware addresses from slave */
 553static void bond_hw_addr_flush(struct net_device *bond_dev,
 554                               struct net_device *slave_dev)
 555{
 556        struct bonding *bond = netdev_priv(bond_dev);
 557
 558        dev_uc_unsync(slave_dev, bond_dev);
 559        dev_mc_unsync(slave_dev, bond_dev);
 560
 561        if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 562                /* del lacpdu mc addr from mc list */
 563                u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 564
 565                dev_mc_del(slave_dev, lacpdu_multicast);
 566        }
 567}
 568
 569/*--------------------------- Active slave change ---------------------------*/
 570
 571/* Update the hardware address list and promisc/allmulti for the new and
 572 * old active slaves (if any).  Modes that are not using primary keep all
 573 * slaves up date at all times; only the modes that use primary need to call
 574 * this function to swap these settings during a failover.
 575 */
 576static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
 577                              struct slave *old_active)
 578{
 579        if (old_active) {
 580                if (bond->dev->flags & IFF_PROMISC)
 581                        dev_set_promiscuity(old_active->dev, -1);
 582
 583                if (bond->dev->flags & IFF_ALLMULTI)
 584                        dev_set_allmulti(old_active->dev, -1);
 585
 586                bond_hw_addr_flush(bond->dev, old_active->dev);
 587        }
 588
 589        if (new_active) {
 590                /* FIXME: Signal errors upstream. */
 591                if (bond->dev->flags & IFF_PROMISC)
 592                        dev_set_promiscuity(new_active->dev, 1);
 593
 594                if (bond->dev->flags & IFF_ALLMULTI)
 595                        dev_set_allmulti(new_active->dev, 1);
 596
 597                netif_addr_lock_bh(bond->dev);
 598                dev_uc_sync(new_active->dev, bond->dev);
 599                dev_mc_sync(new_active->dev, bond->dev);
 600                netif_addr_unlock_bh(bond->dev);
 601        }
 602}
 603
 604/**
 605 * bond_set_dev_addr - clone slave's address to bond
 606 * @bond_dev: bond net device
 607 * @slave_dev: slave net device
 608 *
 609 * Should be called with RTNL held.
 610 */
 611static int bond_set_dev_addr(struct net_device *bond_dev,
 612                             struct net_device *slave_dev)
 613{
 614        int err;
 615
 616        slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
 617                  bond_dev, slave_dev, slave_dev->addr_len);
 618        err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL);
 619        if (err)
 620                return err;
 621
 622        memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
 623        bond_dev->addr_assign_type = NET_ADDR_STOLEN;
 624        call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
 625        return 0;
 626}
 627
 628static struct slave *bond_get_old_active(struct bonding *bond,
 629                                         struct slave *new_active)
 630{
 631        struct slave *slave;
 632        struct list_head *iter;
 633
 634        bond_for_each_slave(bond, slave, iter) {
 635                if (slave == new_active)
 636                        continue;
 637
 638                if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
 639                        return slave;
 640        }
 641
 642        return NULL;
 643}
 644
 645/* bond_do_fail_over_mac
 646 *
 647 * Perform special MAC address swapping for fail_over_mac settings
 648 *
 649 * Called with RTNL
 650 */
 651static void bond_do_fail_over_mac(struct bonding *bond,
 652                                  struct slave *new_active,
 653                                  struct slave *old_active)
 654{
 655        u8 tmp_mac[MAX_ADDR_LEN];
 656        struct sockaddr_storage ss;
 657        int rv;
 658
 659        switch (bond->params.fail_over_mac) {
 660        case BOND_FOM_ACTIVE:
 661                if (new_active) {
 662                        rv = bond_set_dev_addr(bond->dev, new_active->dev);
 663                        if (rv)
 664                                slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n",
 665                                          -rv);
 666                }
 667                break;
 668        case BOND_FOM_FOLLOW:
 669                /* if new_active && old_active, swap them
 670                 * if just old_active, do nothing (going to no active slave)
 671                 * if just new_active, set new_active to bond's MAC
 672                 */
 673                if (!new_active)
 674                        return;
 675
 676                if (!old_active)
 677                        old_active = bond_get_old_active(bond, new_active);
 678
 679                if (old_active) {
 680                        bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr,
 681                                          new_active->dev->addr_len);
 682                        bond_hw_addr_copy(ss.__data,
 683                                          old_active->dev->dev_addr,
 684                                          old_active->dev->addr_len);
 685                        ss.ss_family = new_active->dev->type;
 686                } else {
 687                        bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
 688                                          bond->dev->addr_len);
 689                        ss.ss_family = bond->dev->type;
 690                }
 691
 692                rv = dev_set_mac_address(new_active->dev,
 693                                         (struct sockaddr *)&ss, NULL);
 694                if (rv) {
 695                        slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n",
 696                                  -rv);
 697                        goto out;
 698                }
 699
 700                if (!old_active)
 701                        goto out;
 702
 703                bond_hw_addr_copy(ss.__data, tmp_mac,
 704                                  new_active->dev->addr_len);
 705                ss.ss_family = old_active->dev->type;
 706
 707                rv = dev_set_mac_address(old_active->dev,
 708                                         (struct sockaddr *)&ss, NULL);
 709                if (rv)
 710                        slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n",
 711                                  -rv);
 712out:
 713                break;
 714        default:
 715                netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
 716                           bond->params.fail_over_mac);
 717                break;
 718        }
 719
 720}
 721
 722static struct slave *bond_choose_primary_or_current(struct bonding *bond)
 723{
 724        struct slave *prim = rtnl_dereference(bond->primary_slave);
 725        struct slave *curr = rtnl_dereference(bond->curr_active_slave);
 726
 727        if (!prim || prim->link != BOND_LINK_UP) {
 728                if (!curr || curr->link != BOND_LINK_UP)
 729                        return NULL;
 730                return curr;
 731        }
 732
 733        if (bond->force_primary) {
 734                bond->force_primary = false;
 735                return prim;
 736        }
 737
 738        if (!curr || curr->link != BOND_LINK_UP)
 739                return prim;
 740
 741        /* At this point, prim and curr are both up */
 742        switch (bond->params.primary_reselect) {
 743        case BOND_PRI_RESELECT_ALWAYS:
 744                return prim;
 745        case BOND_PRI_RESELECT_BETTER:
 746                if (prim->speed < curr->speed)
 747                        return curr;
 748                if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
 749                        return curr;
 750                return prim;
 751        case BOND_PRI_RESELECT_FAILURE:
 752                return curr;
 753        default:
 754                netdev_err(bond->dev, "impossible primary_reselect %d\n",
 755                           bond->params.primary_reselect);
 756                return curr;
 757        }
 758}
 759
 760/**
 761 * bond_find_best_slave - select the best available slave to be the active one
 762 * @bond: our bonding struct
 763 */
 764static struct slave *bond_find_best_slave(struct bonding *bond)
 765{
 766        struct slave *slave, *bestslave = NULL;
 767        struct list_head *iter;
 768        int mintime = bond->params.updelay;
 769
 770        slave = bond_choose_primary_or_current(bond);
 771        if (slave)
 772                return slave;
 773
 774        bond_for_each_slave(bond, slave, iter) {
 775                if (slave->link == BOND_LINK_UP)
 776                        return slave;
 777                if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
 778                    slave->delay < mintime) {
 779                        mintime = slave->delay;
 780                        bestslave = slave;
 781                }
 782        }
 783
 784        return bestslave;
 785}
 786
 787static bool bond_should_notify_peers(struct bonding *bond)
 788{
 789        struct slave *slave;
 790
 791        rcu_read_lock();
 792        slave = rcu_dereference(bond->curr_active_slave);
 793        rcu_read_unlock();
 794
 795        netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
 796                   slave ? slave->dev->name : "NULL");
 797
 798        if (!slave || !bond->send_peer_notif ||
 799            bond->send_peer_notif %
 800            max(1, bond->params.peer_notif_delay) != 0 ||
 801            !netif_carrier_ok(bond->dev) ||
 802            test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
 803                return false;
 804
 805        return true;
 806}
 807
 808/**
 809 * change_active_interface - change the active slave into the specified one
 810 * @bond: our bonding struct
 811 * @new: the new slave to make the active one
 812 *
 813 * Set the new slave to the bond's settings and unset them on the old
 814 * curr_active_slave.
 815 * Setting include flags, mc-list, promiscuity, allmulti, etc.
 816 *
 817 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 818 * because it is apparently the best available slave we have, even though its
 819 * updelay hasn't timed out yet.
 820 *
 821 * Caller must hold RTNL.
 822 */
 823void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 824{
 825        struct slave *old_active;
 826
 827        ASSERT_RTNL();
 828
 829        old_active = rtnl_dereference(bond->curr_active_slave);
 830
 831        if (old_active == new_active)
 832                return;
 833
 834        if (new_active) {
 835                new_active->last_link_up = jiffies;
 836
 837                if (new_active->link == BOND_LINK_BACK) {
 838                        if (bond_uses_primary(bond)) {
 839                                slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n",
 840                                           (bond->params.updelay - new_active->delay) * bond->params.miimon);
 841                        }
 842
 843                        new_active->delay = 0;
 844                        bond_set_slave_link_state(new_active, BOND_LINK_UP,
 845                                                  BOND_SLAVE_NOTIFY_NOW);
 846
 847                        if (BOND_MODE(bond) == BOND_MODE_8023AD)
 848                                bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
 849
 850                        if (bond_is_lb(bond))
 851                                bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
 852                } else {
 853                        if (bond_uses_primary(bond)) {
 854                                slave_info(bond->dev, new_active->dev, "making interface the new active one\n");
 855                        }
 856                }
 857        }
 858
 859        if (bond_uses_primary(bond))
 860                bond_hw_addr_swap(bond, new_active, old_active);
 861
 862        if (bond_is_lb(bond)) {
 863                bond_alb_handle_active_change(bond, new_active);
 864                if (old_active)
 865                        bond_set_slave_inactive_flags(old_active,
 866                                                      BOND_SLAVE_NOTIFY_NOW);
 867                if (new_active)
 868                        bond_set_slave_active_flags(new_active,
 869                                                    BOND_SLAVE_NOTIFY_NOW);
 870        } else {
 871                rcu_assign_pointer(bond->curr_active_slave, new_active);
 872        }
 873
 874        if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
 875                if (old_active)
 876                        bond_set_slave_inactive_flags(old_active,
 877                                                      BOND_SLAVE_NOTIFY_NOW);
 878
 879                if (new_active) {
 880                        bool should_notify_peers = false;
 881
 882                        bond_set_slave_active_flags(new_active,
 883                                                    BOND_SLAVE_NOTIFY_NOW);
 884
 885                        if (bond->params.fail_over_mac)
 886                                bond_do_fail_over_mac(bond, new_active,
 887                                                      old_active);
 888
 889                        if (netif_running(bond->dev)) {
 890                                bond->send_peer_notif =
 891                                        bond->params.num_peer_notif *
 892                                        max(1, bond->params.peer_notif_delay);
 893                                should_notify_peers =
 894                                        bond_should_notify_peers(bond);
 895                        }
 896
 897                        call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
 898                        if (should_notify_peers) {
 899                                bond->send_peer_notif--;
 900                                call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
 901                                                         bond->dev);
 902                        }
 903                }
 904        }
 905
 906        /* resend IGMP joins since active slave has changed or
 907         * all were sent on curr_active_slave.
 908         * resend only if bond is brought up with the affected
 909         * bonding modes and the retransmission is enabled
 910         */
 911        if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
 912            ((bond_uses_primary(bond) && new_active) ||
 913             BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
 914                bond->igmp_retrans = bond->params.resend_igmp;
 915                queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 916        }
 917}
 918
 919/**
 920 * bond_select_active_slave - select a new active slave, if needed
 921 * @bond: our bonding struct
 922 *
 923 * This functions should be called when one of the following occurs:
 924 * - The old curr_active_slave has been released or lost its link.
 925 * - The primary_slave has got its link back.
 926 * - A slave has got its link back and there's no old curr_active_slave.
 927 *
 928 * Caller must hold RTNL.
 929 */
 930void bond_select_active_slave(struct bonding *bond)
 931{
 932        struct slave *best_slave;
 933        int rv;
 934
 935        ASSERT_RTNL();
 936
 937        best_slave = bond_find_best_slave(bond);
 938        if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
 939                bond_change_active_slave(bond, best_slave);
 940                rv = bond_set_carrier(bond);
 941                if (!rv)
 942                        return;
 943
 944                if (netif_carrier_ok(bond->dev))
 945                        netdev_info(bond->dev, "active interface up!\n");
 946                else
 947                        netdev_info(bond->dev, "now running without any active interface!\n");
 948        }
 949}
 950
 951#ifdef CONFIG_NET_POLL_CONTROLLER
 952static inline int slave_enable_netpoll(struct slave *slave)
 953{
 954        struct netpoll *np;
 955        int err = 0;
 956
 957        np = kzalloc(sizeof(*np), GFP_KERNEL);
 958        err = -ENOMEM;
 959        if (!np)
 960                goto out;
 961
 962        err = __netpoll_setup(np, slave->dev);
 963        if (err) {
 964                kfree(np);
 965                goto out;
 966        }
 967        slave->np = np;
 968out:
 969        return err;
 970}
 971static inline void slave_disable_netpoll(struct slave *slave)
 972{
 973        struct netpoll *np = slave->np;
 974
 975        if (!np)
 976                return;
 977
 978        slave->np = NULL;
 979
 980        __netpoll_free(np);
 981}
 982
 983static void bond_poll_controller(struct net_device *bond_dev)
 984{
 985        struct bonding *bond = netdev_priv(bond_dev);
 986        struct slave *slave = NULL;
 987        struct list_head *iter;
 988        struct ad_info ad_info;
 989
 990        if (BOND_MODE(bond) == BOND_MODE_8023AD)
 991                if (bond_3ad_get_active_agg_info(bond, &ad_info))
 992                        return;
 993
 994        bond_for_each_slave_rcu(bond, slave, iter) {
 995                if (!bond_slave_is_up(slave))
 996                        continue;
 997
 998                if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 999                        struct aggregator *agg =
1000                            SLAVE_AD_INFO(slave)->port.aggregator;
1001
1002                        if (agg &&
1003                            agg->aggregator_identifier != ad_info.aggregator_id)
1004                                continue;
1005                }
1006
1007                netpoll_poll_dev(slave->dev);
1008        }
1009}
1010
1011static void bond_netpoll_cleanup(struct net_device *bond_dev)
1012{
1013        struct bonding *bond = netdev_priv(bond_dev);
1014        struct list_head *iter;
1015        struct slave *slave;
1016
1017        bond_for_each_slave(bond, slave, iter)
1018                if (bond_slave_is_up(slave))
1019                        slave_disable_netpoll(slave);
1020}
1021
1022static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1023{
1024        struct bonding *bond = netdev_priv(dev);
1025        struct list_head *iter;
1026        struct slave *slave;
1027        int err = 0;
1028
1029        bond_for_each_slave(bond, slave, iter) {
1030                err = slave_enable_netpoll(slave);
1031                if (err) {
1032                        bond_netpoll_cleanup(dev);
1033                        break;
1034                }
1035        }
1036        return err;
1037}
1038#else
1039static inline int slave_enable_netpoll(struct slave *slave)
1040{
1041        return 0;
1042}
1043static inline void slave_disable_netpoll(struct slave *slave)
1044{
1045}
1046static void bond_netpoll_cleanup(struct net_device *bond_dev)
1047{
1048}
1049#endif
1050
1051/*---------------------------------- IOCTL ----------------------------------*/
1052
1053static netdev_features_t bond_fix_features(struct net_device *dev,
1054                                           netdev_features_t features)
1055{
1056        struct bonding *bond = netdev_priv(dev);
1057        struct list_head *iter;
1058        netdev_features_t mask;
1059        struct slave *slave;
1060
1061        mask = features;
1062
1063        features &= ~NETIF_F_ONE_FOR_ALL;
1064        features |= NETIF_F_ALL_FOR_ALL;
1065
1066        bond_for_each_slave(bond, slave, iter) {
1067                features = netdev_increment_features(features,
1068                                                     slave->dev->features,
1069                                                     mask);
1070        }
1071        features = netdev_add_tso_features(features, mask);
1072
1073        return features;
1074}
1075
1076#define BOND_VLAN_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1077                                 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1078                                 NETIF_F_HIGHDMA | NETIF_F_LRO)
1079
1080#define BOND_ENC_FEATURES       (NETIF_F_HW_CSUM | NETIF_F_SG | \
1081                                 NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
1082
1083#define BOND_MPLS_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1084                                 NETIF_F_ALL_TSO)
1085
1086static void bond_compute_features(struct bonding *bond)
1087{
1088        unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1089                                        IFF_XMIT_DST_RELEASE_PERM;
1090        netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1091        netdev_features_t enc_features  = BOND_ENC_FEATURES;
1092        netdev_features_t mpls_features  = BOND_MPLS_FEATURES;
1093        struct net_device *bond_dev = bond->dev;
1094        struct list_head *iter;
1095        struct slave *slave;
1096        unsigned short max_hard_header_len = ETH_HLEN;
1097        unsigned int gso_max_size = GSO_MAX_SIZE;
1098        u16 gso_max_segs = GSO_MAX_SEGS;
1099
1100        if (!bond_has_slaves(bond))
1101                goto done;
1102        vlan_features &= NETIF_F_ALL_FOR_ALL;
1103        mpls_features &= NETIF_F_ALL_FOR_ALL;
1104
1105        bond_for_each_slave(bond, slave, iter) {
1106                vlan_features = netdev_increment_features(vlan_features,
1107                        slave->dev->vlan_features, BOND_VLAN_FEATURES);
1108
1109                enc_features = netdev_increment_features(enc_features,
1110                                                         slave->dev->hw_enc_features,
1111                                                         BOND_ENC_FEATURES);
1112
1113                mpls_features = netdev_increment_features(mpls_features,
1114                                                          slave->dev->mpls_features,
1115                                                          BOND_MPLS_FEATURES);
1116
1117                dst_release_flag &= slave->dev->priv_flags;
1118                if (slave->dev->hard_header_len > max_hard_header_len)
1119                        max_hard_header_len = slave->dev->hard_header_len;
1120
1121                gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1122                gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1123        }
1124        bond_dev->hard_header_len = max_hard_header_len;
1125
1126done:
1127        bond_dev->vlan_features = vlan_features;
1128        bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
1129                                    NETIF_F_HW_VLAN_CTAG_TX |
1130                                    NETIF_F_HW_VLAN_STAG_TX |
1131                                    NETIF_F_GSO_UDP_L4;
1132        bond_dev->mpls_features = mpls_features;
1133        bond_dev->gso_max_segs = gso_max_segs;
1134        netif_set_gso_max_size(bond_dev, gso_max_size);
1135
1136        bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1137        if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1138            dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1139                bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1140
1141        netdev_change_features(bond_dev);
1142}
1143
1144static void bond_setup_by_slave(struct net_device *bond_dev,
1145                                struct net_device *slave_dev)
1146{
1147        bond_dev->header_ops        = slave_dev->header_ops;
1148
1149        bond_dev->type              = slave_dev->type;
1150        bond_dev->hard_header_len   = slave_dev->hard_header_len;
1151        bond_dev->addr_len          = slave_dev->addr_len;
1152
1153        memcpy(bond_dev->broadcast, slave_dev->broadcast,
1154                slave_dev->addr_len);
1155}
1156
1157/* On bonding slaves other than the currently active slave, suppress
1158 * duplicates except for alb non-mcast/bcast.
1159 */
1160static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1161                                            struct slave *slave,
1162                                            struct bonding *bond)
1163{
1164        if (bond_is_slave_inactive(slave)) {
1165                if (BOND_MODE(bond) == BOND_MODE_ALB &&
1166                    skb->pkt_type != PACKET_BROADCAST &&
1167                    skb->pkt_type != PACKET_MULTICAST)
1168                        return false;
1169                return true;
1170        }
1171        return false;
1172}
1173
1174static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1175{
1176        struct sk_buff *skb = *pskb;
1177        struct slave *slave;
1178        struct bonding *bond;
1179        int (*recv_probe)(const struct sk_buff *, struct bonding *,
1180                          struct slave *);
1181        int ret = RX_HANDLER_ANOTHER;
1182
1183        skb = skb_share_check(skb, GFP_ATOMIC);
1184        if (unlikely(!skb))
1185                return RX_HANDLER_CONSUMED;
1186
1187        *pskb = skb;
1188
1189        slave = bond_slave_get_rcu(skb->dev);
1190        bond = slave->bond;
1191
1192        recv_probe = READ_ONCE(bond->recv_probe);
1193        if (recv_probe) {
1194                ret = recv_probe(skb, bond, slave);
1195                if (ret == RX_HANDLER_CONSUMED) {
1196                        consume_skb(skb);
1197                        return ret;
1198                }
1199        }
1200
1201        /*
1202         * For packets determined by bond_should_deliver_exact_match() call to
1203         * be suppressed we want to make an exception for link-local packets.
1204         * This is necessary for e.g. LLDP daemons to be able to monitor
1205         * inactive slave links without being forced to bind to them
1206         * explicitly.
1207         *
1208         * At the same time, packets that are passed to the bonding master
1209         * (including link-local ones) can have their originating interface
1210         * determined via PACKET_ORIGDEV socket option.
1211         */
1212        if (bond_should_deliver_exact_match(skb, slave, bond)) {
1213                if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
1214                        return RX_HANDLER_PASS;
1215                return RX_HANDLER_EXACT;
1216        }
1217
1218        skb->dev = bond->dev;
1219
1220        if (BOND_MODE(bond) == BOND_MODE_ALB &&
1221            bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1222            skb->pkt_type == PACKET_HOST) {
1223
1224                if (unlikely(skb_cow_head(skb,
1225                                          skb->data - skb_mac_header(skb)))) {
1226                        kfree_skb(skb);
1227                        return RX_HANDLER_CONSUMED;
1228                }
1229                bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,
1230                                  bond->dev->addr_len);
1231        }
1232
1233        return ret;
1234}
1235
1236static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1237{
1238        switch (BOND_MODE(bond)) {
1239        case BOND_MODE_ROUNDROBIN:
1240                return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1241        case BOND_MODE_ACTIVEBACKUP:
1242                return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1243        case BOND_MODE_BROADCAST:
1244                return NETDEV_LAG_TX_TYPE_BROADCAST;
1245        case BOND_MODE_XOR:
1246        case BOND_MODE_8023AD:
1247                return NETDEV_LAG_TX_TYPE_HASH;
1248        default:
1249                return NETDEV_LAG_TX_TYPE_UNKNOWN;
1250        }
1251}
1252
1253static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond,
1254                                               enum netdev_lag_tx_type type)
1255{
1256        if (type != NETDEV_LAG_TX_TYPE_HASH)
1257                return NETDEV_LAG_HASH_NONE;
1258
1259        switch (bond->params.xmit_policy) {
1260        case BOND_XMIT_POLICY_LAYER2:
1261                return NETDEV_LAG_HASH_L2;
1262        case BOND_XMIT_POLICY_LAYER34:
1263                return NETDEV_LAG_HASH_L34;
1264        case BOND_XMIT_POLICY_LAYER23:
1265                return NETDEV_LAG_HASH_L23;
1266        case BOND_XMIT_POLICY_ENCAP23:
1267                return NETDEV_LAG_HASH_E23;
1268        case BOND_XMIT_POLICY_ENCAP34:
1269                return NETDEV_LAG_HASH_E34;
1270        default:
1271                return NETDEV_LAG_HASH_UNKNOWN;
1272        }
1273}
1274
1275static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave,
1276                                      struct netlink_ext_ack *extack)
1277{
1278        struct netdev_lag_upper_info lag_upper_info;
1279        enum netdev_lag_tx_type type;
1280
1281        type = bond_lag_tx_type(bond);
1282        lag_upper_info.tx_type = type;
1283        lag_upper_info.hash_type = bond_lag_hash_type(bond, type);
1284
1285        return netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1286                                            &lag_upper_info, extack);
1287}
1288
1289static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1290{
1291        netdev_upper_dev_unlink(slave->dev, bond->dev);
1292        slave->dev->flags &= ~IFF_SLAVE;
1293}
1294
1295static struct slave *bond_alloc_slave(struct bonding *bond)
1296{
1297        struct slave *slave = NULL;
1298
1299        slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1300        if (!slave)
1301                return NULL;
1302
1303        if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1304                SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1305                                               GFP_KERNEL);
1306                if (!SLAVE_AD_INFO(slave)) {
1307                        kfree(slave);
1308                        return NULL;
1309                }
1310        }
1311        INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work);
1312
1313        return slave;
1314}
1315
1316static void bond_free_slave(struct slave *slave)
1317{
1318        struct bonding *bond = bond_get_bond_by_slave(slave);
1319
1320        cancel_delayed_work_sync(&slave->notify_work);
1321        if (BOND_MODE(bond) == BOND_MODE_8023AD)
1322                kfree(SLAVE_AD_INFO(slave));
1323
1324        kfree(slave);
1325}
1326
1327static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1328{
1329        info->bond_mode = BOND_MODE(bond);
1330        info->miimon = bond->params.miimon;
1331        info->num_slaves = bond->slave_cnt;
1332}
1333
1334static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1335{
1336        strcpy(info->slave_name, slave->dev->name);
1337        info->link = slave->link;
1338        info->state = bond_slave_state(slave);
1339        info->link_failure_count = slave->link_failure_count;
1340}
1341
1342static void bond_netdev_notify_work(struct work_struct *_work)
1343{
1344        struct slave *slave = container_of(_work, struct slave,
1345                                           notify_work.work);
1346
1347        if (rtnl_trylock()) {
1348                struct netdev_bonding_info binfo;
1349
1350                bond_fill_ifslave(slave, &binfo.slave);
1351                bond_fill_ifbond(slave->bond, &binfo.master);
1352                netdev_bonding_info_change(slave->dev, &binfo);
1353                rtnl_unlock();
1354        } else {
1355                queue_delayed_work(slave->bond->wq, &slave->notify_work, 1);
1356        }
1357}
1358
1359void bond_queue_slave_event(struct slave *slave)
1360{
1361        queue_delayed_work(slave->bond->wq, &slave->notify_work, 0);
1362}
1363
1364void bond_lower_state_changed(struct slave *slave)
1365{
1366        struct netdev_lag_lower_state_info info;
1367
1368        info.link_up = slave->link == BOND_LINK_UP ||
1369                       slave->link == BOND_LINK_FAIL;
1370        info.tx_enabled = bond_is_active_slave(slave);
1371        netdev_lower_state_changed(slave->dev, &info);
1372}
1373
1374/* enslave device <slave> to bond device <master> */
1375int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
1376                 struct netlink_ext_ack *extack)
1377{
1378        struct bonding *bond = netdev_priv(bond_dev);
1379        const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1380        struct slave *new_slave = NULL, *prev_slave;
1381        struct sockaddr_storage ss;
1382        int link_reporting;
1383        int res = 0, i;
1384
1385        if (!bond->params.use_carrier &&
1386            slave_dev->ethtool_ops->get_link == NULL &&
1387            slave_ops->ndo_do_ioctl == NULL) {
1388                slave_warn(bond_dev, slave_dev, "no link monitoring support\n");
1389        }
1390
1391        /* already in-use? */
1392        if (netdev_is_rx_handler_busy(slave_dev)) {
1393                NL_SET_ERR_MSG(extack, "Device is in use and cannot be enslaved");
1394                slave_err(bond_dev, slave_dev,
1395                          "Error: Device is in use and cannot be enslaved\n");
1396                return -EBUSY;
1397        }
1398
1399        if (bond_dev == slave_dev) {
1400                NL_SET_ERR_MSG(extack, "Cannot enslave bond to itself.");
1401                netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1402                return -EPERM;
1403        }
1404
1405        /* vlan challenged mutual exclusion */
1406        /* no need to lock since we're protected by rtnl_lock */
1407        if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1408                slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n");
1409                if (vlan_uses_dev(bond_dev)) {
1410                        NL_SET_ERR_MSG(extack, "Can not enslave VLAN challenged device to VLAN enabled bond");
1411                        slave_err(bond_dev, slave_dev, "Error: cannot enslave VLAN challenged slave on VLAN enabled bond\n");
1412                        return -EPERM;
1413                } else {
1414                        slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n");
1415                }
1416        } else {
1417                slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n");
1418        }
1419
1420        /* Old ifenslave binaries are no longer supported.  These can
1421         * be identified with moderate accuracy by the state of the slave:
1422         * the current ifenslave will set the interface down prior to
1423         * enslaving it; the old ifenslave will not.
1424         */
1425        if (slave_dev->flags & IFF_UP) {
1426                NL_SET_ERR_MSG(extack, "Device can not be enslaved while up");
1427                slave_err(bond_dev, slave_dev, "slave is up - this may be due to an out of date ifenslave\n");
1428                return -EPERM;
1429        }
1430
1431        /* set bonding device ether type by slave - bonding netdevices are
1432         * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1433         * there is a need to override some of the type dependent attribs/funcs.
1434         *
1435         * bond ether type mutual exclusion - don't allow slaves of dissimilar
1436         * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1437         */
1438        if (!bond_has_slaves(bond)) {
1439                if (bond_dev->type != slave_dev->type) {
1440                        slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n",
1441                                  bond_dev->type, slave_dev->type);
1442
1443                        res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1444                                                       bond_dev);
1445                        res = notifier_to_errno(res);
1446                        if (res) {
1447                                slave_err(bond_dev, slave_dev, "refused to change device type\n");
1448                                return -EBUSY;
1449                        }
1450
1451                        /* Flush unicast and multicast addresses */
1452                        dev_uc_flush(bond_dev);
1453                        dev_mc_flush(bond_dev);
1454
1455                        if (slave_dev->type != ARPHRD_ETHER)
1456                                bond_setup_by_slave(bond_dev, slave_dev);
1457                        else {
1458                                ether_setup(bond_dev);
1459                                bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1460                        }
1461
1462                        call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1463                                                 bond_dev);
1464                }
1465        } else if (bond_dev->type != slave_dev->type) {
1466                NL_SET_ERR_MSG(extack, "Device type is different from other slaves");
1467                slave_err(bond_dev, slave_dev, "ether type (%d) is different from other slaves (%d), can not enslave it\n",
1468                          slave_dev->type, bond_dev->type);
1469                return -EINVAL;
1470        }
1471
1472        if (slave_dev->type == ARPHRD_INFINIBAND &&
1473            BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1474                NL_SET_ERR_MSG(extack, "Only active-backup mode is supported for infiniband slaves");
1475                slave_warn(bond_dev, slave_dev, "Type (%d) supports only active-backup mode\n",
1476                           slave_dev->type);
1477                res = -EOPNOTSUPP;
1478                goto err_undo_flags;
1479        }
1480
1481        if (!slave_ops->ndo_set_mac_address ||
1482            slave_dev->type == ARPHRD_INFINIBAND) {
1483                slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n");
1484                if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1485                    bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1486                        if (!bond_has_slaves(bond)) {
1487                                bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1488                                slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n");
1489                        } else {
1490                                NL_SET_ERR_MSG(extack, "Slave device does not support setting the MAC address, but fail_over_mac is not set to active");
1491                                slave_err(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active\n");
1492                                res = -EOPNOTSUPP;
1493                                goto err_undo_flags;
1494                        }
1495                }
1496        }
1497
1498        call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1499
1500        /* If this is the first slave, then we need to set the master's hardware
1501         * address to be the same as the slave's.
1502         */
1503        if (!bond_has_slaves(bond) &&
1504            bond->dev->addr_assign_type == NET_ADDR_RANDOM) {
1505                res = bond_set_dev_addr(bond->dev, slave_dev);
1506                if (res)
1507                        goto err_undo_flags;
1508        }
1509
1510        new_slave = bond_alloc_slave(bond);
1511        if (!new_slave) {
1512                res = -ENOMEM;
1513                goto err_undo_flags;
1514        }
1515
1516        new_slave->bond = bond;
1517        new_slave->dev = slave_dev;
1518        /* Set the new_slave's queue_id to be zero.  Queue ID mapping
1519         * is set via sysfs or module option if desired.
1520         */
1521        new_slave->queue_id = 0;
1522
1523        /* Save slave's original mtu and then set it to match the bond */
1524        new_slave->original_mtu = slave_dev->mtu;
1525        res = dev_set_mtu(slave_dev, bond->dev->mtu);
1526        if (res) {
1527                slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res);
1528                goto err_free;
1529        }
1530
1531        /* Save slave's original ("permanent") mac address for modes
1532         * that need it, and for restoring it upon release, and then
1533         * set it to the master's address
1534         */
1535        bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,
1536                          slave_dev->addr_len);
1537
1538        if (!bond->params.fail_over_mac ||
1539            BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1540                /* Set slave to master's mac address.  The application already
1541                 * set the master's mac address to that of the first slave
1542                 */
1543                memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
1544                ss.ss_family = slave_dev->type;
1545                res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss,
1546                                          extack);
1547                if (res) {
1548                        slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res);
1549                        goto err_restore_mtu;
1550                }
1551        }
1552
1553        /* set slave flag before open to prevent IPv6 addrconf */
1554        slave_dev->flags |= IFF_SLAVE;
1555
1556        /* open the slave since the application closed it */
1557        res = dev_open(slave_dev, extack);
1558        if (res) {
1559                slave_err(bond_dev, slave_dev, "Opening slave failed\n");
1560                goto err_restore_mac;
1561        }
1562
1563        slave_dev->priv_flags |= IFF_BONDING;
1564        /* initialize slave stats */
1565        dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1566
1567        if (bond_is_lb(bond)) {
1568                /* bond_alb_init_slave() must be called before all other stages since
1569                 * it might fail and we do not want to have to undo everything
1570                 */
1571                res = bond_alb_init_slave(bond, new_slave);
1572                if (res)
1573                        goto err_close;
1574        }
1575
1576        res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1577        if (res) {
1578                slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n");
1579                goto err_close;
1580        }
1581
1582        prev_slave = bond_last_slave(bond);
1583
1584        new_slave->delay = 0;
1585        new_slave->link_failure_count = 0;
1586
1587        if (bond_update_speed_duplex(new_slave) &&
1588            bond_needs_speed_duplex(bond))
1589                new_slave->link = BOND_LINK_DOWN;
1590
1591        new_slave->last_rx = jiffies -
1592                (msecs_to_jiffies(bond->params.arp_interval) + 1);
1593        for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1594                new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1595
1596        if (bond->params.miimon && !bond->params.use_carrier) {
1597                link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1598
1599                if ((link_reporting == -1) && !bond->params.arp_interval) {
1600                        /* miimon is set but a bonded network driver
1601                         * does not support ETHTOOL/MII and
1602                         * arp_interval is not set.  Note: if
1603                         * use_carrier is enabled, we will never go
1604                         * here (because netif_carrier is always
1605                         * supported); thus, we don't need to change
1606                         * the messages for netif_carrier.
1607                         */
1608                        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");
1609                } else if (link_reporting == -1) {
1610                        /* unable get link status using mii/ethtool */
1611                        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");
1612                }
1613        }
1614
1615        /* check for initial state */
1616        new_slave->link = BOND_LINK_NOCHANGE;
1617        if (bond->params.miimon) {
1618                if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1619                        if (bond->params.updelay) {
1620                                bond_set_slave_link_state(new_slave,
1621                                                          BOND_LINK_BACK,
1622                                                          BOND_SLAVE_NOTIFY_NOW);
1623                                new_slave->delay = bond->params.updelay;
1624                        } else {
1625                                bond_set_slave_link_state(new_slave,
1626                                                          BOND_LINK_UP,
1627                                                          BOND_SLAVE_NOTIFY_NOW);
1628                        }
1629                } else {
1630                        bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1631                                                  BOND_SLAVE_NOTIFY_NOW);
1632                }
1633        } else if (bond->params.arp_interval) {
1634                bond_set_slave_link_state(new_slave,
1635                                          (netif_carrier_ok(slave_dev) ?
1636                                          BOND_LINK_UP : BOND_LINK_DOWN),
1637                                          BOND_SLAVE_NOTIFY_NOW);
1638        } else {
1639                bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1640                                          BOND_SLAVE_NOTIFY_NOW);
1641        }
1642
1643        if (new_slave->link != BOND_LINK_DOWN)
1644                new_slave->last_link_up = jiffies;
1645        slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n",
1646                  new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1647                  (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1648
1649        if (bond_uses_primary(bond) && bond->params.primary[0]) {
1650                /* if there is a primary slave, remember it */
1651                if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1652                        rcu_assign_pointer(bond->primary_slave, new_slave);
1653                        bond->force_primary = true;
1654                }
1655        }
1656
1657        switch (BOND_MODE(bond)) {
1658        case BOND_MODE_ACTIVEBACKUP:
1659                bond_set_slave_inactive_flags(new_slave,
1660                                              BOND_SLAVE_NOTIFY_NOW);
1661                break;
1662        case BOND_MODE_8023AD:
1663                /* in 802.3ad mode, the internal mechanism
1664                 * will activate the slaves in the selected
1665                 * aggregator
1666                 */
1667                bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1668                /* if this is the first slave */
1669                if (!prev_slave) {
1670                        SLAVE_AD_INFO(new_slave)->id = 1;
1671                        /* Initialize AD with the number of times that the AD timer is called in 1 second
1672                         * can be called only after the mac address of the bond is set
1673                         */
1674                        bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1675                } else {
1676                        SLAVE_AD_INFO(new_slave)->id =
1677                                SLAVE_AD_INFO(prev_slave)->id + 1;
1678                }
1679
1680                bond_3ad_bind_slave(new_slave);
1681                break;
1682        case BOND_MODE_TLB:
1683        case BOND_MODE_ALB:
1684                bond_set_active_slave(new_slave);
1685                bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1686                break;
1687        default:
1688                slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n");
1689
1690                /* always active in trunk mode */
1691                bond_set_active_slave(new_slave);
1692
1693                /* In trunking mode there is little meaning to curr_active_slave
1694                 * anyway (it holds no special properties of the bond device),
1695                 * so we can change it without calling change_active_interface()
1696                 */
1697                if (!rcu_access_pointer(bond->curr_active_slave) &&
1698                    new_slave->link == BOND_LINK_UP)
1699                        rcu_assign_pointer(bond->curr_active_slave, new_slave);
1700
1701                break;
1702        } /* switch(bond_mode) */
1703
1704#ifdef CONFIG_NET_POLL_CONTROLLER
1705        if (bond->dev->npinfo) {
1706                if (slave_enable_netpoll(new_slave)) {
1707                        slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1708                        res = -EBUSY;
1709                        goto err_detach;
1710                }
1711        }
1712#endif
1713
1714        if (!(bond_dev->features & NETIF_F_LRO))
1715                dev_disable_lro(slave_dev);
1716
1717        res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1718                                         new_slave);
1719        if (res) {
1720                slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res);
1721                goto err_detach;
1722        }
1723
1724        res = bond_master_upper_dev_link(bond, new_slave, extack);
1725        if (res) {
1726                slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1727                goto err_unregister;
1728        }
1729
1730        res = bond_sysfs_slave_add(new_slave);
1731        if (res) {
1732                slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1733                goto err_upper_unlink;
1734        }
1735
1736        /* If the mode uses primary, then the following is handled by
1737         * bond_change_active_slave().
1738         */
1739        if (!bond_uses_primary(bond)) {
1740                /* set promiscuity level to new slave */
1741                if (bond_dev->flags & IFF_PROMISC) {
1742                        res = dev_set_promiscuity(slave_dev, 1);
1743                        if (res)
1744                                goto err_sysfs_del;
1745                }
1746
1747                /* set allmulti level to new slave */
1748                if (bond_dev->flags & IFF_ALLMULTI) {
1749                        res = dev_set_allmulti(slave_dev, 1);
1750                        if (res) {
1751                                if (bond_dev->flags & IFF_PROMISC)
1752                                        dev_set_promiscuity(slave_dev, -1);
1753                                goto err_sysfs_del;
1754                        }
1755                }
1756
1757                netif_addr_lock_bh(bond_dev);
1758                dev_mc_sync_multiple(slave_dev, bond_dev);
1759                dev_uc_sync_multiple(slave_dev, bond_dev);
1760                netif_addr_unlock_bh(bond_dev);
1761
1762                if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1763                        /* add lacpdu mc addr to mc list */
1764                        u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1765
1766                        dev_mc_add(slave_dev, lacpdu_multicast);
1767                }
1768        }
1769
1770        bond->slave_cnt++;
1771        bond_compute_features(bond);
1772        bond_set_carrier(bond);
1773
1774        if (bond_uses_primary(bond)) {
1775                block_netpoll_tx();
1776                bond_select_active_slave(bond);
1777                unblock_netpoll_tx();
1778        }
1779
1780        if (bond_mode_can_use_xmit_hash(bond))
1781                bond_update_slave_arr(bond, NULL);
1782
1783
1784        slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n",
1785                   bond_is_active_slave(new_slave) ? "an active" : "a backup",
1786                   new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1787
1788        /* enslave is successful */
1789        bond_queue_slave_event(new_slave);
1790        return 0;
1791
1792/* Undo stages on error */
1793err_sysfs_del:
1794        bond_sysfs_slave_del(new_slave);
1795
1796err_upper_unlink:
1797        bond_upper_dev_unlink(bond, new_slave);
1798
1799err_unregister:
1800        netdev_rx_handler_unregister(slave_dev);
1801
1802err_detach:
1803        vlan_vids_del_by_dev(slave_dev, bond_dev);
1804        if (rcu_access_pointer(bond->primary_slave) == new_slave)
1805                RCU_INIT_POINTER(bond->primary_slave, NULL);
1806        if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1807                block_netpoll_tx();
1808                bond_change_active_slave(bond, NULL);
1809                bond_select_active_slave(bond);
1810                unblock_netpoll_tx();
1811        }
1812        /* either primary_slave or curr_active_slave might've changed */
1813        synchronize_rcu();
1814        slave_disable_netpoll(new_slave);
1815
1816err_close:
1817        if (!netif_is_bond_master(slave_dev))
1818                slave_dev->priv_flags &= ~IFF_BONDING;
1819        dev_close(slave_dev);
1820
1821err_restore_mac:
1822        slave_dev->flags &= ~IFF_SLAVE;
1823        if (!bond->params.fail_over_mac ||
1824            BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1825                /* XXX TODO - fom follow mode needs to change master's
1826                 * MAC if this slave's MAC is in use by the bond, or at
1827                 * least print a warning.
1828                 */
1829                bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
1830                                  new_slave->dev->addr_len);
1831                ss.ss_family = slave_dev->type;
1832                dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
1833        }
1834
1835err_restore_mtu:
1836        dev_set_mtu(slave_dev, new_slave->original_mtu);
1837
1838err_free:
1839        bond_free_slave(new_slave);
1840
1841err_undo_flags:
1842        /* Enslave of first slave has failed and we need to fix master's mac */
1843        if (!bond_has_slaves(bond)) {
1844                if (ether_addr_equal_64bits(bond_dev->dev_addr,
1845                                            slave_dev->dev_addr))
1846                        eth_hw_addr_random(bond_dev);
1847                if (bond_dev->type != ARPHRD_ETHER) {
1848                        dev_close(bond_dev);
1849                        ether_setup(bond_dev);
1850                        bond_dev->flags |= IFF_MASTER;
1851                        bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1852                }
1853        }
1854
1855        return res;
1856}
1857
1858/* Try to release the slave device <slave> from the bond device <master>
1859 * It is legal to access curr_active_slave without a lock because all the function
1860 * is RTNL-locked. If "all" is true it means that the function is being called
1861 * while destroying a bond interface and all slaves are being released.
1862 *
1863 * The rules for slave state should be:
1864 *   for Active/Backup:
1865 *     Active stays on all backups go down
1866 *   for Bonded connections:
1867 *     The first up interface should be left on and all others downed.
1868 */
1869static int __bond_release_one(struct net_device *bond_dev,
1870                              struct net_device *slave_dev,
1871                              bool all, bool unregister)
1872{
1873        struct bonding *bond = netdev_priv(bond_dev);
1874        struct slave *slave, *oldcurrent;
1875        struct sockaddr_storage ss;
1876        int old_flags = bond_dev->flags;
1877        netdev_features_t old_features = bond_dev->features;
1878
1879        /* slave is not a slave or master is not master of this slave */
1880        if (!(slave_dev->flags & IFF_SLAVE) ||
1881            !netdev_has_upper_dev(slave_dev, bond_dev)) {
1882                slave_dbg(bond_dev, slave_dev, "cannot release slave\n");
1883                return -EINVAL;
1884        }
1885
1886        block_netpoll_tx();
1887
1888        slave = bond_get_slave_by_dev(bond, slave_dev);
1889        if (!slave) {
1890                /* not a slave of this bond */
1891                slave_info(bond_dev, slave_dev, "interface not enslaved\n");
1892                unblock_netpoll_tx();
1893                return -EINVAL;
1894        }
1895
1896        bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
1897
1898        bond_sysfs_slave_del(slave);
1899
1900        /* recompute stats just before removing the slave */
1901        bond_get_stats(bond->dev, &bond->bond_stats);
1902
1903        bond_upper_dev_unlink(bond, slave);
1904        /* unregister rx_handler early so bond_handle_frame wouldn't be called
1905         * for this slave anymore.
1906         */
1907        netdev_rx_handler_unregister(slave_dev);
1908
1909        if (BOND_MODE(bond) == BOND_MODE_8023AD)
1910                bond_3ad_unbind_slave(slave);
1911
1912        if (bond_mode_can_use_xmit_hash(bond))
1913                bond_update_slave_arr(bond, slave);
1914
1915        slave_info(bond_dev, slave_dev, "Releasing %s interface\n",
1916                    bond_is_active_slave(slave) ? "active" : "backup");
1917
1918        oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1919
1920        RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1921
1922        if (!all && (!bond->params.fail_over_mac ||
1923                     BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1924                if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1925                    bond_has_slaves(bond))
1926                        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",
1927                                   slave->perm_hwaddr);
1928        }
1929
1930        if (rtnl_dereference(bond->primary_slave) == slave)
1931                RCU_INIT_POINTER(bond->primary_slave, NULL);
1932
1933        if (oldcurrent == slave)
1934                bond_change_active_slave(bond, NULL);
1935
1936        if (bond_is_lb(bond)) {
1937                /* Must be called only after the slave has been
1938                 * detached from the list and the curr_active_slave
1939                 * has been cleared (if our_slave == old_current),
1940                 * but before a new active slave is selected.
1941                 */
1942                bond_alb_deinit_slave(bond, slave);
1943        }
1944
1945        if (all) {
1946                RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1947        } else if (oldcurrent == slave) {
1948                /* Note that we hold RTNL over this sequence, so there
1949                 * is no concern that another slave add/remove event
1950                 * will interfere.
1951                 */
1952                bond_select_active_slave(bond);
1953        }
1954
1955        if (!bond_has_slaves(bond)) {
1956                bond_set_carrier(bond);
1957                eth_hw_addr_random(bond_dev);
1958        }
1959
1960        unblock_netpoll_tx();
1961        synchronize_rcu();
1962        bond->slave_cnt--;
1963
1964        if (!bond_has_slaves(bond)) {
1965                call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1966                call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1967        }
1968
1969        bond_compute_features(bond);
1970        if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1971            (old_features & NETIF_F_VLAN_CHALLENGED))
1972                slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n");
1973
1974        vlan_vids_del_by_dev(slave_dev, bond_dev);
1975
1976        /* If the mode uses primary, then this case was handled above by
1977         * bond_change_active_slave(..., NULL)
1978         */
1979        if (!bond_uses_primary(bond)) {
1980                /* unset promiscuity level from slave
1981                 * NOTE: The NETDEV_CHANGEADDR call above may change the value
1982                 * of the IFF_PROMISC flag in the bond_dev, but we need the
1983                 * value of that flag before that change, as that was the value
1984                 * when this slave was attached, so we cache at the start of the
1985                 * function and use it here. Same goes for ALLMULTI below
1986                 */
1987                if (old_flags & IFF_PROMISC)
1988                        dev_set_promiscuity(slave_dev, -1);
1989
1990                /* unset allmulti level from slave */
1991                if (old_flags & IFF_ALLMULTI)
1992                        dev_set_allmulti(slave_dev, -1);
1993
1994                bond_hw_addr_flush(bond_dev, slave_dev);
1995        }
1996
1997        slave_disable_netpoll(slave);
1998
1999        /* close slave before restoring its mac address */
2000        dev_close(slave_dev);
2001
2002        if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
2003            BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2004                /* restore original ("permanent") mac address */
2005                bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
2006                                  slave->dev->addr_len);
2007                ss.ss_family = slave_dev->type;
2008                dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2009        }
2010
2011        if (unregister)
2012                __dev_set_mtu(slave_dev, slave->original_mtu);
2013        else
2014                dev_set_mtu(slave_dev, slave->original_mtu);
2015
2016        if (!netif_is_bond_master(slave_dev))
2017                slave_dev->priv_flags &= ~IFF_BONDING;
2018
2019        bond_free_slave(slave);
2020
2021        return 0;
2022}
2023
2024/* A wrapper used because of ndo_del_link */
2025int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2026{
2027        return __bond_release_one(bond_dev, slave_dev, false, false);
2028}
2029
2030/* First release a slave and then destroy the bond if no more slaves are left.
2031 * Must be under rtnl_lock when this function is called.
2032 */
2033static int bond_release_and_destroy(struct net_device *bond_dev,
2034                                    struct net_device *slave_dev)
2035{
2036        struct bonding *bond = netdev_priv(bond_dev);
2037        int ret;
2038
2039        ret = __bond_release_one(bond_dev, slave_dev, false, true);
2040        if (ret == 0 && !bond_has_slaves(bond)) {
2041                bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2042                netdev_info(bond_dev, "Destroying bond\n");
2043                bond_remove_proc_entry(bond);
2044                unregister_netdevice(bond_dev);
2045        }
2046        return ret;
2047}
2048
2049static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2050{
2051        struct bonding *bond = netdev_priv(bond_dev);
2052        bond_fill_ifbond(bond, info);
2053}
2054
2055static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2056{
2057        struct bonding *bond = netdev_priv(bond_dev);
2058        struct list_head *iter;
2059        int i = 0, res = -ENODEV;
2060        struct slave *slave;
2061
2062        bond_for_each_slave(bond, slave, iter) {
2063                if (i++ == (int)info->slave_id) {
2064                        res = 0;
2065                        bond_fill_ifslave(slave, info);
2066                        break;
2067                }
2068        }
2069
2070        return res;
2071}
2072
2073/*-------------------------------- Monitoring -------------------------------*/
2074
2075/* called with rcu_read_lock() */
2076static int bond_miimon_inspect(struct bonding *bond)
2077{
2078        int link_state, commit = 0;
2079        struct list_head *iter;
2080        struct slave *slave;
2081        bool ignore_updelay;
2082
2083        ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2084
2085        bond_for_each_slave_rcu(bond, slave, iter) {
2086                bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2087
2088                link_state = bond_check_dev_link(bond, slave->dev, 0);
2089
2090                switch (slave->link) {
2091                case BOND_LINK_UP:
2092                        if (link_state)
2093                                continue;
2094
2095                        bond_propose_link_state(slave, BOND_LINK_FAIL);
2096                        commit++;
2097                        slave->delay = bond->params.downdelay;
2098                        if (slave->delay) {
2099                                slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n",
2100                                           (BOND_MODE(bond) ==
2101                                            BOND_MODE_ACTIVEBACKUP) ?
2102                                            (bond_is_active_slave(slave) ?
2103                                             "active " : "backup ") : "",
2104                                           bond->params.downdelay * bond->params.miimon);
2105                        }
2106                        /*FALLTHRU*/
2107                case BOND_LINK_FAIL:
2108                        if (link_state) {
2109                                /* recovered before downdelay expired */
2110                                bond_propose_link_state(slave, BOND_LINK_UP);
2111                                slave->last_link_up = jiffies;
2112                                slave_info(bond->dev, slave->dev, "link status up again after %d ms\n",
2113                                           (bond->params.downdelay - slave->delay) *
2114                                           bond->params.miimon);
2115                                commit++;
2116                                continue;
2117                        }
2118
2119                        if (slave->delay <= 0) {
2120                                bond_propose_link_state(slave, BOND_LINK_DOWN);
2121                                commit++;
2122                                continue;
2123                        }
2124
2125                        slave->delay--;
2126                        break;
2127
2128                case BOND_LINK_DOWN:
2129                        if (!link_state)
2130                                continue;
2131
2132                        bond_propose_link_state(slave, BOND_LINK_BACK);
2133                        commit++;
2134                        slave->delay = bond->params.updelay;
2135
2136                        if (slave->delay) {
2137                                slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n",
2138                                           ignore_updelay ? 0 :
2139                                           bond->params.updelay *
2140                                           bond->params.miimon);
2141                        }
2142                        /*FALLTHRU*/
2143                case BOND_LINK_BACK:
2144                        if (!link_state) {
2145                                bond_propose_link_state(slave, BOND_LINK_DOWN);
2146                                slave_info(bond->dev, slave->dev, "link status down again after %d ms\n",
2147                                           (bond->params.updelay - slave->delay) *
2148                                           bond->params.miimon);
2149                                commit++;
2150                                continue;
2151                        }
2152
2153                        if (ignore_updelay)
2154                                slave->delay = 0;
2155
2156                        if (slave->delay <= 0) {
2157                                bond_propose_link_state(slave, BOND_LINK_UP);
2158                                commit++;
2159                                ignore_updelay = false;
2160                                continue;
2161                        }
2162
2163                        slave->delay--;
2164                        break;
2165                }
2166        }
2167
2168        return commit;
2169}
2170
2171static void bond_miimon_link_change(struct bonding *bond,
2172                                    struct slave *slave,
2173                                    char link)
2174{
2175        switch (BOND_MODE(bond)) {
2176        case BOND_MODE_8023AD:
2177                bond_3ad_handle_link_change(slave, link);
2178                break;
2179        case BOND_MODE_TLB:
2180        case BOND_MODE_ALB:
2181                bond_alb_handle_link_change(bond, slave, link);
2182                break;
2183        case BOND_MODE_XOR:
2184                bond_update_slave_arr(bond, NULL);
2185                break;
2186        }
2187}
2188
2189static void bond_miimon_commit(struct bonding *bond)
2190{
2191        struct list_head *iter;
2192        struct slave *slave, *primary;
2193
2194        bond_for_each_slave(bond, slave, iter) {
2195                switch (slave->link_new_state) {
2196                case BOND_LINK_NOCHANGE:
2197                        /* For 802.3ad mode, check current slave speed and
2198                         * duplex again in case its port was disabled after
2199                         * invalid speed/duplex reporting but recovered before
2200                         * link monitoring could make a decision on the actual
2201                         * link status
2202                         */
2203                        if (BOND_MODE(bond) == BOND_MODE_8023AD &&
2204                            slave->link == BOND_LINK_UP)
2205                                bond_3ad_adapter_speed_duplex_changed(slave);
2206                        continue;
2207
2208                case BOND_LINK_UP:
2209                        if (bond_update_speed_duplex(slave) &&
2210                            bond_needs_speed_duplex(bond)) {
2211                                slave->link = BOND_LINK_DOWN;
2212                                if (net_ratelimit())
2213                                        slave_warn(bond->dev, slave->dev,
2214                                                   "failed to get link speed/duplex\n");
2215                                continue;
2216                        }
2217                        bond_set_slave_link_state(slave, BOND_LINK_UP,
2218                                                  BOND_SLAVE_NOTIFY_NOW);
2219                        slave->last_link_up = jiffies;
2220
2221                        primary = rtnl_dereference(bond->primary_slave);
2222                        if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2223                                /* prevent it from being the active one */
2224                                bond_set_backup_slave(slave);
2225                        } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2226                                /* make it immediately active */
2227                                bond_set_active_slave(slave);
2228                        } else if (slave != primary) {
2229                                /* prevent it from being the active one */
2230                                bond_set_backup_slave(slave);
2231                        }
2232
2233                        slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n",
2234                                   slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2235                                   slave->duplex ? "full" : "half");
2236
2237                        bond_miimon_link_change(bond, slave, BOND_LINK_UP);
2238
2239                        if (!bond->curr_active_slave || slave == primary)
2240                                goto do_failover;
2241
2242                        continue;
2243
2244                case BOND_LINK_DOWN:
2245                        if (slave->link_failure_count < UINT_MAX)
2246                                slave->link_failure_count++;
2247
2248                        bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2249                                                  BOND_SLAVE_NOTIFY_NOW);
2250
2251                        if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2252                            BOND_MODE(bond) == BOND_MODE_8023AD)
2253                                bond_set_slave_inactive_flags(slave,
2254                                                              BOND_SLAVE_NOTIFY_NOW);
2255
2256                        slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
2257
2258                        bond_miimon_link_change(bond, slave, BOND_LINK_DOWN);
2259
2260                        if (slave == rcu_access_pointer(bond->curr_active_slave))
2261                                goto do_failover;
2262
2263                        continue;
2264
2265                default:
2266                        slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n",
2267                                  slave->link_new_state);
2268                        bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2269
2270                        continue;
2271                }
2272
2273do_failover:
2274                block_netpoll_tx();
2275                bond_select_active_slave(bond);
2276                unblock_netpoll_tx();
2277        }
2278
2279        bond_set_carrier(bond);
2280}
2281
2282/* bond_mii_monitor
2283 *
2284 * Really a wrapper that splits the mii monitor into two phases: an
2285 * inspection, then (if inspection indicates something needs to be done)
2286 * an acquisition of appropriate locks followed by a commit phase to
2287 * implement whatever link state changes are indicated.
2288 */
2289static void bond_mii_monitor(struct work_struct *work)
2290{
2291        struct bonding *bond = container_of(work, struct bonding,
2292                                            mii_work.work);
2293        bool should_notify_peers = false;
2294        bool commit;
2295        unsigned long delay;
2296        struct slave *slave;
2297        struct list_head *iter;
2298
2299        delay = msecs_to_jiffies(bond->params.miimon);
2300
2301        if (!bond_has_slaves(bond))
2302                goto re_arm;
2303
2304        rcu_read_lock();
2305        should_notify_peers = bond_should_notify_peers(bond);
2306        commit = !!bond_miimon_inspect(bond);
2307        if (bond->send_peer_notif) {
2308                rcu_read_unlock();
2309                if (rtnl_trylock()) {
2310                        bond->send_peer_notif--;
2311                        rtnl_unlock();
2312                }
2313        } else {
2314                rcu_read_unlock();
2315        }
2316
2317        if (commit) {
2318                /* Race avoidance with bond_close cancel of workqueue */
2319                if (!rtnl_trylock()) {
2320                        delay = 1;
2321                        should_notify_peers = false;
2322                        goto re_arm;
2323                }
2324
2325                bond_for_each_slave(bond, slave, iter) {
2326                        bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
2327                }
2328                bond_miimon_commit(bond);
2329
2330                rtnl_unlock();  /* might sleep, hold no other locks */
2331        }
2332
2333re_arm:
2334        if (bond->params.miimon)
2335                queue_delayed_work(bond->wq, &bond->mii_work, delay);
2336
2337        if (should_notify_peers) {
2338                if (!rtnl_trylock())
2339                        return;
2340                call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2341                rtnl_unlock();
2342        }
2343}
2344
2345static int bond_upper_dev_walk(struct net_device *upper, void *data)
2346{
2347        __be32 ip = *((__be32 *)data);
2348
2349        return ip == bond_confirm_addr(upper, 0, ip);
2350}
2351
2352static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2353{
2354        bool ret = false;
2355
2356        if (ip == bond_confirm_addr(bond->dev, 0, ip))
2357                return true;
2358
2359        rcu_read_lock();
2360        if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &ip))
2361                ret = true;
2362        rcu_read_unlock();
2363
2364        return ret;
2365}
2366
2367/* We go to the (large) trouble of VLAN tagging ARP frames because
2368 * switches in VLAN mode (especially if ports are configured as
2369 * "native" to a VLAN) might not pass non-tagged frames.
2370 */
2371static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip,
2372                          __be32 src_ip, struct bond_vlan_tag *tags)
2373{
2374        struct sk_buff *skb;
2375        struct bond_vlan_tag *outer_tag = tags;
2376        struct net_device *slave_dev = slave->dev;
2377        struct net_device *bond_dev = slave->bond->dev;
2378
2379        slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n",
2380                  arp_op, &dest_ip, &src_ip);
2381
2382        skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2383                         NULL, slave_dev->dev_addr, NULL);
2384
2385        if (!skb) {
2386                net_err_ratelimited("ARP packet allocation failed\n");
2387                return;
2388        }
2389
2390        if (!tags || tags->vlan_proto == VLAN_N_VID)
2391                goto xmit;
2392
2393        tags++;
2394
2395        /* Go through all the tags backwards and add them to the packet */
2396        while (tags->vlan_proto != VLAN_N_VID) {
2397                if (!tags->vlan_id) {
2398                        tags++;
2399                        continue;
2400                }
2401
2402                slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n",
2403                          ntohs(outer_tag->vlan_proto), tags->vlan_id);
2404                skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2405                                                tags->vlan_id);
2406                if (!skb) {
2407                        net_err_ratelimited("failed to insert inner VLAN tag\n");
2408                        return;
2409                }
2410
2411                tags++;
2412        }
2413        /* Set the outer tag */
2414        if (outer_tag->vlan_id) {
2415                slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n",
2416                          ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2417                __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2418                                       outer_tag->vlan_id);
2419        }
2420
2421xmit:
2422        arp_xmit(skb);
2423}
2424
2425/* Validate the device path between the @start_dev and the @end_dev.
2426 * The path is valid if the @end_dev is reachable through device
2427 * stacking.
2428 * When the path is validated, collect any vlan information in the
2429 * path.
2430 */
2431struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2432                                              struct net_device *end_dev,
2433                                              int level)
2434{
2435        struct bond_vlan_tag *tags;
2436        struct net_device *upper;
2437        struct list_head  *iter;
2438
2439        if (start_dev == end_dev) {
2440                tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC);
2441                if (!tags)
2442                        return ERR_PTR(-ENOMEM);
2443                tags[level].vlan_proto = VLAN_N_VID;
2444                return tags;
2445        }
2446
2447        netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2448                tags = bond_verify_device_path(upper, end_dev, level + 1);
2449                if (IS_ERR_OR_NULL(tags)) {
2450                        if (IS_ERR(tags))
2451                                return tags;
2452                        continue;
2453                }
2454                if (is_vlan_dev(upper)) {
2455                        tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2456                        tags[level].vlan_id = vlan_dev_vlan_id(upper);
2457                }
2458
2459                return tags;
2460        }
2461
2462        return NULL;
2463}
2464
2465static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2466{
2467        struct rtable *rt;
2468        struct bond_vlan_tag *tags;
2469        __be32 *targets = bond->params.arp_targets, addr;
2470        int i;
2471
2472        for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2473                slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n",
2474                          __func__, &targets[i]);
2475                tags = NULL;
2476
2477                /* Find out through which dev should the packet go */
2478                rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2479                                     RTO_ONLINK, 0);
2480                if (IS_ERR(rt)) {
2481                        /* there's no route to target - try to send arp
2482                         * probe to generate any traffic (arp_validate=0)
2483                         */
2484                        if (bond->params.arp_validate)
2485                                net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2486                                                     bond->dev->name,
2487                                                     &targets[i]);
2488                        bond_arp_send(slave, ARPOP_REQUEST, targets[i],
2489                                      0, tags);
2490                        continue;
2491                }
2492
2493                /* bond device itself */
2494                if (rt->dst.dev == bond->dev)
2495                        goto found;
2496
2497                rcu_read_lock();
2498                tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2499                rcu_read_unlock();
2500
2501                if (!IS_ERR_OR_NULL(tags))
2502                        goto found;
2503
2504                /* Not our device - skip */
2505                slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2506                           &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2507
2508                ip_rt_put(rt);
2509                continue;
2510
2511found:
2512                addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2513                ip_rt_put(rt);
2514                bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags);
2515                kfree(tags);
2516        }
2517}
2518
2519static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2520{
2521        int i;
2522
2523        if (!sip || !bond_has_this_ip(bond, tip)) {
2524                slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n",
2525                           __func__, &sip, &tip);
2526                return;
2527        }
2528
2529        i = bond_get_targets_ip(bond->params.arp_targets, sip);
2530        if (i == -1) {
2531                slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n",
2532                           __func__, &sip);
2533                return;
2534        }
2535        slave->last_rx = jiffies;
2536        slave->target_last_arp_rx[i] = jiffies;
2537}
2538
2539int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2540                 struct slave *slave)
2541{
2542        struct arphdr *arp = (struct arphdr *)skb->data;
2543        struct slave *curr_active_slave, *curr_arp_slave;
2544        unsigned char *arp_ptr;
2545        __be32 sip, tip;
2546        int is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2547        unsigned int alen;
2548
2549        if (!slave_do_arp_validate(bond, slave)) {
2550                if ((slave_do_arp_validate_only(bond) && is_arp) ||
2551                    !slave_do_arp_validate_only(bond))
2552                        slave->last_rx = jiffies;
2553                return RX_HANDLER_ANOTHER;
2554        } else if (!is_arp) {
2555                return RX_HANDLER_ANOTHER;
2556        }
2557
2558        alen = arp_hdr_len(bond->dev);
2559
2560        slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n",
2561                   __func__, skb->dev->name);
2562
2563        if (alen > skb_headlen(skb)) {
2564                arp = kmalloc(alen, GFP_ATOMIC);
2565                if (!arp)
2566                        goto out_unlock;
2567                if (skb_copy_bits(skb, 0, arp, alen) < 0)
2568                        goto out_unlock;
2569        }
2570
2571        if (arp->ar_hln != bond->dev->addr_len ||
2572            skb->pkt_type == PACKET_OTHERHOST ||
2573            skb->pkt_type == PACKET_LOOPBACK ||
2574            arp->ar_hrd != htons(ARPHRD_ETHER) ||
2575            arp->ar_pro != htons(ETH_P_IP) ||
2576            arp->ar_pln != 4)
2577                goto out_unlock;
2578
2579        arp_ptr = (unsigned char *)(arp + 1);
2580        arp_ptr += bond->dev->addr_len;
2581        memcpy(&sip, arp_ptr, 4);
2582        arp_ptr += 4 + bond->dev->addr_len;
2583        memcpy(&tip, arp_ptr, 4);
2584
2585        slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2586                  __func__, slave->dev->name, bond_slave_state(slave),
2587                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2588                  &sip, &tip);
2589
2590        curr_active_slave = rcu_dereference(bond->curr_active_slave);
2591        curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2592
2593        /* We 'trust' the received ARP enough to validate it if:
2594         *
2595         * (a) the slave receiving the ARP is active (which includes the
2596         * current ARP slave, if any), or
2597         *
2598         * (b) the receiving slave isn't active, but there is a currently
2599         * active slave and it received valid arp reply(s) after it became
2600         * the currently active slave, or
2601         *
2602         * (c) there is an ARP slave that sent an ARP during the prior ARP
2603         * interval, and we receive an ARP reply on any slave.  We accept
2604         * these because switch FDB update delays may deliver the ARP
2605         * reply to a slave other than the sender of the ARP request.
2606         *
2607         * Note: for (b), backup slaves are receiving the broadcast ARP
2608         * request, not a reply.  This request passes from the sending
2609         * slave through the L2 switch(es) to the receiving slave.  Since
2610         * this is checking the request, sip/tip are swapped for
2611         * validation.
2612         *
2613         * This is done to avoid endless looping when we can't reach the
2614         * arp_ip_target and fool ourselves with our own arp requests.
2615         */
2616        if (bond_is_active_slave(slave))
2617                bond_validate_arp(bond, slave, sip, tip);
2618        else if (curr_active_slave &&
2619                 time_after(slave_last_rx(bond, curr_active_slave),
2620                            curr_active_slave->last_link_up))
2621                bond_validate_arp(bond, slave, tip, sip);
2622        else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2623                 bond_time_in_interval(bond,
2624                                       dev_trans_start(curr_arp_slave->dev), 1))
2625                bond_validate_arp(bond, slave, sip, tip);
2626
2627out_unlock:
2628        if (arp != (struct arphdr *)skb->data)
2629                kfree(arp);
2630        return RX_HANDLER_ANOTHER;
2631}
2632
2633/* function to verify if we're in the arp_interval timeslice, returns true if
2634 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2635 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2636 */
2637static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2638                                  int mod)
2639{
2640        int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2641
2642        return time_in_range(jiffies,
2643                             last_act - delta_in_ticks,
2644                             last_act + mod * delta_in_ticks + delta_in_ticks/2);
2645}
2646
2647/* This function is called regularly to monitor each slave's link
2648 * ensuring that traffic is being sent and received when arp monitoring
2649 * is used in load-balancing mode. if the adapter has been dormant, then an
2650 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2651 * arp monitoring in active backup mode.
2652 */
2653static void bond_loadbalance_arp_mon(struct bonding *bond)
2654{
2655        struct slave *slave, *oldcurrent;
2656        struct list_head *iter;
2657        int do_failover = 0, slave_state_changed = 0;
2658
2659        if (!bond_has_slaves(bond))
2660                goto re_arm;
2661
2662        rcu_read_lock();
2663
2664        oldcurrent = rcu_dereference(bond->curr_active_slave);
2665        /* see if any of the previous devices are up now (i.e. they have
2666         * xmt and rcv traffic). the curr_active_slave does not come into
2667         * the picture unless it is null. also, slave->last_link_up is not
2668         * needed here because we send an arp on each slave and give a slave
2669         * as long as it needs to get the tx/rx within the delta.
2670         * TODO: what about up/down delay in arp mode? it wasn't here before
2671         *       so it can wait
2672         */
2673        bond_for_each_slave_rcu(bond, slave, iter) {
2674                unsigned long trans_start = dev_trans_start(slave->dev);
2675
2676                bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2677
2678                if (slave->link != BOND_LINK_UP) {
2679                        if (bond_time_in_interval(bond, trans_start, 1) &&
2680                            bond_time_in_interval(bond, slave->last_rx, 1)) {
2681
2682                                bond_propose_link_state(slave, BOND_LINK_UP);
2683                                slave_state_changed = 1;
2684
2685                                /* primary_slave has no meaning in round-robin
2686                                 * mode. the window of a slave being up and
2687                                 * curr_active_slave being null after enslaving
2688                                 * is closed.
2689                                 */
2690                                if (!oldcurrent) {
2691                                        slave_info(bond->dev, slave->dev, "link status definitely up\n");
2692                                        do_failover = 1;
2693                                } else {
2694                                        slave_info(bond->dev, slave->dev, "interface is now up\n");
2695                                }
2696                        }
2697                } else {
2698                        /* slave->link == BOND_LINK_UP */
2699
2700                        /* not all switches will respond to an arp request
2701                         * when the source ip is 0, so don't take the link down
2702                         * if we don't know our ip yet
2703                         */
2704                        if (!bond_time_in_interval(bond, trans_start, 2) ||
2705                            !bond_time_in_interval(bond, slave->last_rx, 2)) {
2706
2707                                bond_propose_link_state(slave, BOND_LINK_DOWN);
2708                                slave_state_changed = 1;
2709
2710                                if (slave->link_failure_count < UINT_MAX)
2711                                        slave->link_failure_count++;
2712
2713                                slave_info(bond->dev, slave->dev, "interface is now down\n");
2714
2715                                if (slave == oldcurrent)
2716                                        do_failover = 1;
2717                        }
2718                }
2719
2720                /* note: if switch is in round-robin mode, all links
2721                 * must tx arp to ensure all links rx an arp - otherwise
2722                 * links may oscillate or not come up at all; if switch is
2723                 * in something like xor mode, there is nothing we can
2724                 * do - all replies will be rx'ed on same link causing slaves
2725                 * to be unstable during low/no traffic periods
2726                 */
2727                if (bond_slave_is_up(slave))
2728                        bond_arp_send_all(bond, slave);
2729        }
2730
2731        rcu_read_unlock();
2732
2733        if (do_failover || slave_state_changed) {
2734                if (!rtnl_trylock())
2735                        goto re_arm;
2736
2737                bond_for_each_slave(bond, slave, iter) {
2738                        if (slave->link_new_state != BOND_LINK_NOCHANGE)
2739                                slave->link = slave->link_new_state;
2740                }
2741
2742                if (slave_state_changed) {
2743                        bond_slave_state_change(bond);
2744                        if (BOND_MODE(bond) == BOND_MODE_XOR)
2745                                bond_update_slave_arr(bond, NULL);
2746                }
2747                if (do_failover) {
2748                        block_netpoll_tx();
2749                        bond_select_active_slave(bond);
2750                        unblock_netpoll_tx();
2751                }
2752                rtnl_unlock();
2753        }
2754
2755re_arm:
2756        if (bond->params.arp_interval)
2757                queue_delayed_work(bond->wq, &bond->arp_work,
2758                                   msecs_to_jiffies(bond->params.arp_interval));
2759}
2760
2761/* Called to inspect slaves for active-backup mode ARP monitor link state
2762 * changes.  Sets proposed link state in slaves to specify what action
2763 * should take place for the slave.  Returns 0 if no changes are found, >0
2764 * if changes to link states must be committed.
2765 *
2766 * Called with rcu_read_lock held.
2767 */
2768static int bond_ab_arp_inspect(struct bonding *bond)
2769{
2770        unsigned long trans_start, last_rx;
2771        struct list_head *iter;
2772        struct slave *slave;
2773        int commit = 0;
2774
2775        bond_for_each_slave_rcu(bond, slave, iter) {
2776                bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2777                last_rx = slave_last_rx(bond, slave);
2778
2779                if (slave->link != BOND_LINK_UP) {
2780                        if (bond_time_in_interval(bond, last_rx, 1)) {
2781                                bond_propose_link_state(slave, BOND_LINK_UP);
2782                                commit++;
2783                        }
2784                        continue;
2785                }
2786
2787                /* Give slaves 2*delta after being enslaved or made
2788                 * active.  This avoids bouncing, as the last receive
2789                 * times need a full ARP monitor cycle to be updated.
2790                 */
2791                if (bond_time_in_interval(bond, slave->last_link_up, 2))
2792                        continue;
2793
2794                /* Backup slave is down if:
2795                 * - No current_arp_slave AND
2796                 * - more than 3*delta since last receive AND
2797                 * - the bond has an IP address
2798                 *
2799                 * Note: a non-null current_arp_slave indicates
2800                 * the curr_active_slave went down and we are
2801                 * searching for a new one; under this condition
2802                 * we only take the curr_active_slave down - this
2803                 * gives each slave a chance to tx/rx traffic
2804                 * before being taken out
2805                 */
2806                if (!bond_is_active_slave(slave) &&
2807                    !rcu_access_pointer(bond->current_arp_slave) &&
2808                    !bond_time_in_interval(bond, last_rx, 3)) {
2809                        bond_propose_link_state(slave, BOND_LINK_DOWN);
2810                        commit++;
2811                }
2812
2813                /* Active slave is down if:
2814                 * - more than 2*delta since transmitting OR
2815                 * - (more than 2*delta since receive AND
2816                 *    the bond has an IP address)
2817                 */
2818                trans_start = dev_trans_start(slave->dev);
2819                if (bond_is_active_slave(slave) &&
2820                    (!bond_time_in_interval(bond, trans_start, 2) ||
2821                     !bond_time_in_interval(bond, last_rx, 2))) {
2822                        bond_propose_link_state(slave, BOND_LINK_DOWN);
2823                        commit++;
2824                }
2825        }
2826
2827        return commit;
2828}
2829
2830/* Called to commit link state changes noted by inspection step of
2831 * active-backup mode ARP monitor.
2832 *
2833 * Called with RTNL hold.
2834 */
2835static void bond_ab_arp_commit(struct bonding *bond)
2836{
2837        unsigned long trans_start;
2838        struct list_head *iter;
2839        struct slave *slave;
2840
2841        bond_for_each_slave(bond, slave, iter) {
2842                switch (slave->link_new_state) {
2843                case BOND_LINK_NOCHANGE:
2844                        continue;
2845
2846                case BOND_LINK_UP:
2847                        trans_start = dev_trans_start(slave->dev);
2848                        if (rtnl_dereference(bond->curr_active_slave) != slave ||
2849                            (!rtnl_dereference(bond->curr_active_slave) &&
2850                             bond_time_in_interval(bond, trans_start, 1))) {
2851                                struct slave *current_arp_slave;
2852
2853                                current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2854                                bond_set_slave_link_state(slave, BOND_LINK_UP,
2855                                                          BOND_SLAVE_NOTIFY_NOW);
2856                                if (current_arp_slave) {
2857                                        bond_set_slave_inactive_flags(
2858                                                current_arp_slave,
2859                                                BOND_SLAVE_NOTIFY_NOW);
2860                                        RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2861                                }
2862
2863                                slave_info(bond->dev, slave->dev, "link status definitely up\n");
2864
2865                                if (!rtnl_dereference(bond->curr_active_slave) ||
2866                                    slave == rtnl_dereference(bond->primary_slave))
2867                                        goto do_failover;
2868
2869                        }
2870
2871                        continue;
2872
2873                case BOND_LINK_DOWN:
2874                        if (slave->link_failure_count < UINT_MAX)
2875                                slave->link_failure_count++;
2876
2877                        bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2878                                                  BOND_SLAVE_NOTIFY_NOW);
2879                        bond_set_slave_inactive_flags(slave,
2880                                                      BOND_SLAVE_NOTIFY_NOW);
2881
2882                        slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
2883
2884                        if (slave == rtnl_dereference(bond->curr_active_slave)) {
2885                                RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2886                                goto do_failover;
2887                        }
2888
2889                        continue;
2890
2891                default:
2892                        slave_err(bond->dev, slave->dev,
2893                                  "impossible: link_new_state %d on slave\n",
2894                                  slave->link_new_state);
2895                        continue;
2896                }
2897
2898do_failover:
2899                block_netpoll_tx();
2900                bond_select_active_slave(bond);
2901                unblock_netpoll_tx();
2902        }
2903
2904        bond_set_carrier(bond);
2905}
2906
2907/* Send ARP probes for active-backup mode ARP monitor.
2908 *
2909 * Called with rcu_read_lock held.
2910 */
2911static bool bond_ab_arp_probe(struct bonding *bond)
2912{
2913        struct slave *slave, *before = NULL, *new_slave = NULL,
2914                     *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2915                     *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2916        struct list_head *iter;
2917        bool found = false;
2918        bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2919
2920        if (curr_arp_slave && curr_active_slave)
2921                netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2922                            curr_arp_slave->dev->name,
2923                            curr_active_slave->dev->name);
2924
2925        if (curr_active_slave) {
2926                bond_arp_send_all(bond, curr_active_slave);
2927                return should_notify_rtnl;
2928        }
2929
2930        /* if we don't have a curr_active_slave, search for the next available
2931         * backup slave from the current_arp_slave and make it the candidate
2932         * for becoming the curr_active_slave
2933         */
2934
2935        if (!curr_arp_slave) {
2936                curr_arp_slave = bond_first_slave_rcu(bond);
2937                if (!curr_arp_slave)
2938                        return should_notify_rtnl;
2939        }
2940
2941        bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2942
2943        bond_for_each_slave_rcu(bond, slave, iter) {
2944                if (!found && !before && bond_slave_is_up(slave))
2945                        before = slave;
2946
2947                if (found && !new_slave && bond_slave_is_up(slave))
2948                        new_slave = slave;
2949                /* if the link state is up at this point, we
2950                 * mark it down - this can happen if we have
2951                 * simultaneous link failures and
2952                 * reselect_active_interface doesn't make this
2953                 * one the current slave so it is still marked
2954                 * up when it is actually down
2955                 */
2956                if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2957                        bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2958                                                  BOND_SLAVE_NOTIFY_LATER);
2959                        if (slave->link_failure_count < UINT_MAX)
2960                                slave->link_failure_count++;
2961
2962                        bond_set_slave_inactive_flags(slave,
2963                                                      BOND_SLAVE_NOTIFY_LATER);
2964
2965                        slave_info(bond->dev, slave->dev, "backup interface is now down\n");
2966                }
2967                if (slave == curr_arp_slave)
2968                        found = true;
2969        }
2970
2971        if (!new_slave && before)
2972                new_slave = before;
2973
2974        if (!new_slave)
2975                goto check_state;
2976
2977        bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
2978                                  BOND_SLAVE_NOTIFY_LATER);
2979        bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2980        bond_arp_send_all(bond, new_slave);
2981        new_slave->last_link_up = jiffies;
2982        rcu_assign_pointer(bond->current_arp_slave, new_slave);
2983
2984check_state:
2985        bond_for_each_slave_rcu(bond, slave, iter) {
2986                if (slave->should_notify || slave->should_notify_link) {
2987                        should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2988                        break;
2989                }
2990        }
2991        return should_notify_rtnl;
2992}
2993
2994static void bond_activebackup_arp_mon(struct bonding *bond)
2995{
2996        bool should_notify_peers = false;
2997        bool should_notify_rtnl = false;
2998        int delta_in_ticks;
2999
3000        delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3001
3002        if (!bond_has_slaves(bond))
3003                goto re_arm;
3004
3005        rcu_read_lock();
3006
3007        should_notify_peers = bond_should_notify_peers(bond);
3008
3009        if (bond_ab_arp_inspect(bond)) {
3010                rcu_read_unlock();
3011
3012                /* Race avoidance with bond_close flush of workqueue */
3013                if (!rtnl_trylock()) {
3014                        delta_in_ticks = 1;
3015                        should_notify_peers = false;
3016                        goto re_arm;
3017                }
3018
3019                bond_ab_arp_commit(bond);
3020
3021                rtnl_unlock();
3022                rcu_read_lock();
3023        }
3024
3025        should_notify_rtnl = bond_ab_arp_probe(bond);
3026        rcu_read_unlock();
3027
3028re_arm:
3029        if (bond->params.arp_interval)
3030                queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3031
3032        if (should_notify_peers || should_notify_rtnl) {
3033                if (!rtnl_trylock())
3034                        return;
3035
3036                if (should_notify_peers)
3037                        call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
3038                                                 bond->dev);
3039                if (should_notify_rtnl) {
3040                        bond_slave_state_notify(bond);
3041                        bond_slave_link_notify(bond);
3042                }
3043
3044                rtnl_unlock();
3045        }
3046}
3047
3048static void bond_arp_monitor(struct work_struct *work)
3049{
3050        struct bonding *bond = container_of(work, struct bonding,
3051                                            arp_work.work);
3052
3053        if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3054                bond_activebackup_arp_mon(bond);
3055        else
3056                bond_loadbalance_arp_mon(bond);
3057}
3058
3059/*-------------------------- netdev event handling --------------------------*/
3060
3061/* Change device name */
3062static int bond_event_changename(struct bonding *bond)
3063{
3064        bond_remove_proc_entry(bond);
3065        bond_create_proc_entry(bond);
3066
3067        bond_debug_reregister(bond);
3068
3069        return NOTIFY_DONE;
3070}
3071
3072static int bond_master_netdev_event(unsigned long event,
3073                                    struct net_device *bond_dev)
3074{
3075        struct bonding *event_bond = netdev_priv(bond_dev);
3076
3077        netdev_dbg(bond_dev, "%s called\n", __func__);
3078
3079        switch (event) {
3080        case NETDEV_CHANGENAME:
3081                return bond_event_changename(event_bond);
3082        case NETDEV_UNREGISTER:
3083                bond_remove_proc_entry(event_bond);
3084                break;
3085        case NETDEV_REGISTER:
3086                bond_create_proc_entry(event_bond);
3087                break;
3088        default:
3089                break;
3090        }
3091
3092        return NOTIFY_DONE;
3093}
3094
3095static int bond_slave_netdev_event(unsigned long event,
3096                                   struct net_device *slave_dev)
3097{
3098        struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3099        struct bonding *bond;
3100        struct net_device *bond_dev;
3101
3102        /* A netdev event can be generated while enslaving a device
3103         * before netdev_rx_handler_register is called in which case
3104         * slave will be NULL
3105         */
3106        if (!slave) {
3107                netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__);
3108                return NOTIFY_DONE;
3109        }
3110
3111        bond_dev = slave->bond->dev;
3112        bond = slave->bond;
3113        primary = rtnl_dereference(bond->primary_slave);
3114
3115        slave_dbg(bond_dev, slave_dev, "%s called\n", __func__);
3116
3117        switch (event) {
3118        case NETDEV_UNREGISTER:
3119                if (bond_dev->type != ARPHRD_ETHER)
3120                        bond_release_and_destroy(bond_dev, slave_dev);
3121                else
3122                        __bond_release_one(bond_dev, slave_dev, false, true);
3123                break;
3124        case NETDEV_UP:
3125        case NETDEV_CHANGE:
3126                /* For 802.3ad mode only:
3127                 * Getting invalid Speed/Duplex values here will put slave
3128                 * in weird state. Mark it as link-fail if the link was
3129                 * previously up or link-down if it hasn't yet come up, and
3130                 * let link-monitoring (miimon) set it right when correct
3131                 * speeds/duplex are available.
3132                 */
3133                if (bond_update_speed_duplex(slave) &&
3134                    BOND_MODE(bond) == BOND_MODE_8023AD) {
3135                        if (slave->last_link_up)
3136                                slave->link = BOND_LINK_FAIL;
3137                        else
3138                                slave->link = BOND_LINK_DOWN;
3139                }
3140
3141                if (BOND_MODE(bond) == BOND_MODE_8023AD)
3142                        bond_3ad_adapter_speed_duplex_changed(slave);
3143                /* Fallthrough */
3144        case NETDEV_DOWN:
3145                /* Refresh slave-array if applicable!
3146                 * If the setup does not use miimon or arpmon (mode-specific!),
3147                 * then these events will not cause the slave-array to be
3148                 * refreshed. This will cause xmit to use a slave that is not
3149                 * usable. Avoid such situation by refeshing the array at these
3150                 * events. If these (miimon/arpmon) parameters are configured
3151                 * then array gets refreshed twice and that should be fine!
3152                 */
3153                if (bond_mode_can_use_xmit_hash(bond))
3154                        bond_update_slave_arr(bond, NULL);
3155                break;
3156        case NETDEV_CHANGEMTU:
3157                /* TODO: Should slaves be allowed to
3158                 * independently alter their MTU?  For
3159                 * an active-backup bond, slaves need
3160                 * not be the same type of device, so
3161                 * MTUs may vary.  For other modes,
3162                 * slaves arguably should have the
3163                 * same MTUs. To do this, we'd need to
3164                 * take over the slave's change_mtu
3165                 * function for the duration of their
3166                 * servitude.
3167                 */
3168                break;
3169        case NETDEV_CHANGENAME:
3170                /* we don't care if we don't have primary set */
3171                if (!bond_uses_primary(bond) ||
3172                    !bond->params.primary[0])
3173                        break;
3174
3175                if (slave == primary) {
3176                        /* slave's name changed - he's no longer primary */
3177                        RCU_INIT_POINTER(bond->primary_slave, NULL);
3178                } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3179                        /* we have a new primary slave */
3180                        rcu_assign_pointer(bond->primary_slave, slave);
3181                } else { /* we didn't change primary - exit */
3182                        break;
3183                }
3184
3185                netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3186                            primary ? slave_dev->name : "none");
3187
3188                block_netpoll_tx();
3189                bond_select_active_slave(bond);
3190                unblock_netpoll_tx();
3191                break;
3192        case NETDEV_FEAT_CHANGE:
3193                bond_compute_features(bond);
3194                break;
3195        case NETDEV_RESEND_IGMP:
3196                /* Propagate to master device */
3197                call_netdevice_notifiers(event, slave->bond->dev);
3198                break;
3199        default:
3200                break;
3201        }
3202
3203        return NOTIFY_DONE;
3204}
3205
3206/* bond_netdev_event: handle netdev notifier chain events.
3207 *
3208 * This function receives events for the netdev chain.  The caller (an
3209 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3210 * locks for us to safely manipulate the slave devices (RTNL lock,
3211 * dev_probe_lock).
3212 */
3213static int bond_netdev_event(struct notifier_block *this,
3214                             unsigned long event, void *ptr)
3215{
3216        struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3217
3218        netdev_dbg(event_dev, "%s received %s\n",
3219                   __func__, netdev_cmd_to_name(event));
3220
3221        if (!(event_dev->priv_flags & IFF_BONDING))
3222                return NOTIFY_DONE;
3223
3224        if (event_dev->flags & IFF_MASTER) {
3225                int ret;
3226
3227                ret = bond_master_netdev_event(event, event_dev);
3228                if (ret != NOTIFY_DONE)
3229                        return ret;
3230        }
3231
3232        if (event_dev->flags & IFF_SLAVE)
3233                return bond_slave_netdev_event(event, event_dev);
3234
3235        return NOTIFY_DONE;
3236}
3237
3238static struct notifier_block bond_netdev_notifier = {
3239        .notifier_call = bond_netdev_event,
3240};
3241
3242/*---------------------------- Hashing Policies -----------------------------*/
3243
3244/* L2 hash helper */
3245static inline u32 bond_eth_hash(struct sk_buff *skb)
3246{
3247        struct ethhdr *ep, hdr_tmp;
3248
3249        ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3250        if (ep)
3251                return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3252        return 0;
3253}
3254
3255/* Extract the appropriate headers based on bond's xmit policy */
3256static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3257                              struct flow_keys *fk)
3258{
3259        const struct ipv6hdr *iph6;
3260        const struct iphdr *iph;
3261        int noff, proto = -1;
3262
3263        if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3264                return skb_flow_dissect_flow_keys(skb, fk, 0);
3265
3266        fk->ports.ports = 0;
3267        noff = skb_network_offset(skb);
3268        if (skb->protocol == htons(ETH_P_IP)) {
3269                if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3270                        return false;
3271                iph = ip_hdr(skb);
3272                iph_to_flow_copy_v4addrs(fk, iph);
3273                noff += iph->ihl << 2;
3274                if (!ip_is_fragment(iph))
3275                        proto = iph->protocol;
3276        } else if (skb->protocol == htons(ETH_P_IPV6)) {
3277                if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3278                        return false;
3279                iph6 = ipv6_hdr(skb);
3280                iph_to_flow_copy_v6addrs(fk, iph6);
3281                noff += sizeof(*iph6);
3282                proto = iph6->nexthdr;
3283        } else {
3284                return false;
3285        }
3286        if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3287                fk->ports.ports = skb_flow_get_ports(skb, noff, proto);
3288
3289        return true;
3290}
3291
3292/**
3293 * bond_xmit_hash - generate a hash value based on the xmit policy
3294 * @bond: bonding device
3295 * @skb: buffer to use for headers
3296 *
3297 * This function will extract the necessary headers from the skb buffer and use
3298 * them to generate a hash based on the xmit_policy set in the bonding device
3299 */
3300u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3301{
3302        struct flow_keys flow;
3303        u32 hash;
3304
3305        if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3306            skb->l4_hash)
3307                return skb->hash;
3308
3309        if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3310            !bond_flow_dissect(bond, skb, &flow))
3311                return bond_eth_hash(skb);
3312
3313        if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3314            bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3315                hash = bond_eth_hash(skb);
3316        else
3317                hash = (__force u32)flow.ports.ports;
3318        hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3319                (__force u32)flow_get_u32_src(&flow);
3320        hash ^= (hash >> 16);
3321        hash ^= (hash >> 8);
3322
3323        return hash >> 1;
3324}
3325
3326/*-------------------------- Device entry points ----------------------------*/
3327
3328void bond_work_init_all(struct bonding *bond)
3329{
3330        INIT_DELAYED_WORK(&bond->mcast_work,
3331                          bond_resend_igmp_join_requests_delayed);
3332        INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3333        INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3334        INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);
3335        INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3336        INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3337}
3338
3339static void bond_work_cancel_all(struct bonding *bond)
3340{
3341        cancel_delayed_work_sync(&bond->mii_work);
3342        cancel_delayed_work_sync(&bond->arp_work);
3343        cancel_delayed_work_sync(&bond->alb_work);
3344        cancel_delayed_work_sync(&bond->ad_work);
3345        cancel_delayed_work_sync(&bond->mcast_work);
3346        cancel_delayed_work_sync(&bond->slave_arr_work);
3347}
3348
3349static int bond_open(struct net_device *bond_dev)
3350{
3351        struct bonding *bond = netdev_priv(bond_dev);
3352        struct list_head *iter;
3353        struct slave *slave;
3354
3355        /* reset slave->backup and slave->inactive */
3356        if (bond_has_slaves(bond)) {
3357                bond_for_each_slave(bond, slave, iter) {
3358                        if (bond_uses_primary(bond) &&
3359                            slave != rcu_access_pointer(bond->curr_active_slave)) {
3360                                bond_set_slave_inactive_flags(slave,
3361                                                              BOND_SLAVE_NOTIFY_NOW);
3362                        } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3363                                bond_set_slave_active_flags(slave,
3364                                                            BOND_SLAVE_NOTIFY_NOW);
3365                        }
3366                }
3367        }
3368
3369        if (bond_is_lb(bond)) {
3370                /* bond_alb_initialize must be called before the timer
3371                 * is started.
3372                 */
3373                if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3374                        return -ENOMEM;
3375                if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB)
3376                        queue_delayed_work(bond->wq, &bond->alb_work, 0);
3377        }
3378
3379        if (bond->params.miimon)  /* link check interval, in milliseconds. */
3380                queue_delayed_work(bond->wq, &bond->mii_work, 0);
3381
3382        if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3383                queue_delayed_work(bond->wq, &bond->arp_work, 0);
3384                bond->recv_probe = bond_arp_rcv;
3385        }
3386
3387        if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3388                queue_delayed_work(bond->wq, &bond->ad_work, 0);
3389                /* register to receive LACPDUs */
3390                bond->recv_probe = bond_3ad_lacpdu_recv;
3391                bond_3ad_initiate_agg_selection(bond, 1);
3392        }
3393
3394        if (bond_mode_can_use_xmit_hash(bond))
3395                bond_update_slave_arr(bond, NULL);
3396
3397        return 0;
3398}
3399
3400static int bond_close(struct net_device *bond_dev)
3401{
3402        struct bonding *bond = netdev_priv(bond_dev);
3403
3404        bond_work_cancel_all(bond);
3405        bond->send_peer_notif = 0;
3406        if (bond_is_lb(bond))
3407                bond_alb_deinitialize(bond);
3408        bond->recv_probe = NULL;
3409
3410        return 0;
3411}
3412
3413/* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3414 * that some drivers can provide 32bit values only.
3415 */
3416static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3417                            const struct rtnl_link_stats64 *_new,
3418                            const struct rtnl_link_stats64 *_old)
3419{
3420        const u64 *new = (const u64 *)_new;
3421        const u64 *old = (const u64 *)_old;
3422        u64 *res = (u64 *)_res;
3423        int i;
3424
3425        for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3426                u64 nv = new[i];
3427                u64 ov = old[i];
3428                s64 delta = nv - ov;
3429
3430                /* detects if this particular field is 32bit only */
3431                if (((nv | ov) >> 32) == 0)
3432                        delta = (s64)(s32)((u32)nv - (u32)ov);
3433
3434                /* filter anomalies, some drivers reset their stats
3435                 * at down/up events.
3436                 */
3437                if (delta > 0)
3438                        res[i] += delta;
3439        }
3440}
3441
3442static void bond_get_stats(struct net_device *bond_dev,
3443                           struct rtnl_link_stats64 *stats)
3444{
3445        struct bonding *bond = netdev_priv(bond_dev);
3446        struct rtnl_link_stats64 temp;
3447        struct list_head *iter;
3448        struct slave *slave;
3449
3450        spin_lock(&bond->stats_lock);
3451        memcpy(stats, &bond->bond_stats, sizeof(*stats));
3452
3453        rcu_read_lock();
3454        bond_for_each_slave_rcu(bond, slave, iter) {
3455                const struct rtnl_link_stats64 *new =
3456                        dev_get_stats(slave->dev, &temp);
3457
3458                bond_fold_stats(stats, new, &slave->slave_stats);
3459
3460                /* save off the slave stats for the next run */
3461                memcpy(&slave->slave_stats, new, sizeof(*new));
3462        }
3463        rcu_read_unlock();
3464
3465        memcpy(&bond->bond_stats, stats, sizeof(*stats));
3466        spin_unlock(&bond->stats_lock);
3467}
3468
3469static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3470{
3471        struct bonding *bond = netdev_priv(bond_dev);
3472        struct net_device *slave_dev = NULL;
3473        struct ifbond k_binfo;
3474        struct ifbond __user *u_binfo = NULL;
3475        struct ifslave k_sinfo;
3476        struct ifslave __user *u_sinfo = NULL;
3477        struct mii_ioctl_data *mii = NULL;
3478        struct bond_opt_value newval;
3479        struct net *net;
3480        int res = 0;
3481
3482        netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3483
3484        switch (cmd) {
3485        case SIOCGMIIPHY:
3486                mii = if_mii(ifr);
3487                if (!mii)
3488                        return -EINVAL;
3489
3490                mii->phy_id = 0;
3491                /* Fall Through */
3492        case SIOCGMIIREG:
3493                /* We do this again just in case we were called by SIOCGMIIREG
3494                 * instead of SIOCGMIIPHY.
3495                 */
3496                mii = if_mii(ifr);
3497                if (!mii)
3498                        return -EINVAL;
3499
3500                if (mii->reg_num == 1) {
3501                        mii->val_out = 0;
3502                        if (netif_carrier_ok(bond->dev))
3503                                mii->val_out = BMSR_LSTATUS;
3504                }
3505
3506                return 0;
3507        case BOND_INFO_QUERY_OLD:
3508        case SIOCBONDINFOQUERY:
3509                u_binfo = (struct ifbond __user *)ifr->ifr_data;
3510
3511                if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3512                        return -EFAULT;
3513
3514                bond_info_query(bond_dev, &k_binfo);
3515                if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3516                        return -EFAULT;
3517
3518                return 0;
3519        case BOND_SLAVE_INFO_QUERY_OLD:
3520        case SIOCBONDSLAVEINFOQUERY:
3521                u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3522
3523                if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3524                        return -EFAULT;
3525
3526                res = bond_slave_info_query(bond_dev, &k_sinfo);
3527                if (res == 0 &&
3528                    copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3529                        return -EFAULT;
3530
3531                return res;
3532        default:
3533                break;
3534        }
3535
3536        net = dev_net(bond_dev);
3537
3538        if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3539                return -EPERM;
3540
3541        slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3542
3543        slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev);
3544
3545        if (!slave_dev)
3546                return -ENODEV;
3547
3548        switch (cmd) {
3549        case BOND_ENSLAVE_OLD:
3550        case SIOCBONDENSLAVE:
3551                res = bond_enslave(bond_dev, slave_dev, NULL);
3552                break;
3553        case BOND_RELEASE_OLD:
3554        case SIOCBONDRELEASE:
3555                res = bond_release(bond_dev, slave_dev);
3556                break;
3557        case BOND_SETHWADDR_OLD:
3558        case SIOCBONDSETHWADDR:
3559                res = bond_set_dev_addr(bond_dev, slave_dev);
3560                break;
3561        case BOND_CHANGE_ACTIVE_OLD:
3562        case SIOCBONDCHANGEACTIVE:
3563                bond_opt_initstr(&newval, slave_dev->name);
3564                res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,
3565                                            &newval);
3566                break;
3567        default:
3568                res = -EOPNOTSUPP;
3569        }
3570
3571        return res;
3572}
3573
3574static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3575{
3576        struct bonding *bond = netdev_priv(bond_dev);
3577
3578        if (change & IFF_PROMISC)
3579                bond_set_promiscuity(bond,
3580                                     bond_dev->flags & IFF_PROMISC ? 1 : -1);
3581
3582        if (change & IFF_ALLMULTI)
3583                bond_set_allmulti(bond,
3584                                  bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3585}
3586
3587static void bond_set_rx_mode(struct net_device *bond_dev)
3588{
3589        struct bonding *bond = netdev_priv(bond_dev);
3590        struct list_head *iter;
3591        struct slave *slave;
3592
3593        rcu_read_lock();
3594        if (bond_uses_primary(bond)) {
3595                slave = rcu_dereference(bond->curr_active_slave);
3596                if (slave) {
3597                        dev_uc_sync(slave->dev, bond_dev);
3598                        dev_mc_sync(slave->dev, bond_dev);
3599                }
3600        } else {
3601                bond_for_each_slave_rcu(bond, slave, iter) {
3602                        dev_uc_sync_multiple(slave->dev, bond_dev);
3603                        dev_mc_sync_multiple(slave->dev, bond_dev);
3604                }
3605        }
3606        rcu_read_unlock();
3607}
3608
3609static int bond_neigh_init(struct neighbour *n)
3610{
3611        struct bonding *bond = netdev_priv(n->dev);
3612        const struct net_device_ops *slave_ops;
3613        struct neigh_parms parms;
3614        struct slave *slave;
3615        int ret;
3616
3617        slave = bond_first_slave(bond);
3618        if (!slave)
3619                return 0;
3620        slave_ops = slave->dev->netdev_ops;
3621        if (!slave_ops->ndo_neigh_setup)
3622                return 0;
3623
3624        parms.neigh_setup = NULL;
3625        parms.neigh_cleanup = NULL;
3626        ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3627        if (ret)
3628                return ret;
3629
3630        /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3631         * after the last slave has been detached.  Assumes that all slaves
3632         * utilize the same neigh_cleanup (true at this writing as only user
3633         * is ipoib).
3634         */
3635        n->parms->neigh_cleanup = parms.neigh_cleanup;
3636
3637        if (!parms.neigh_setup)
3638                return 0;
3639
3640        return parms.neigh_setup(n);
3641}
3642
3643/* The bonding ndo_neigh_setup is called at init time beofre any
3644 * slave exists. So we must declare proxy setup function which will
3645 * be used at run time to resolve the actual slave neigh param setup.
3646 *
3647 * It's also called by master devices (such as vlans) to setup their
3648 * underlying devices. In that case - do nothing, we're already set up from
3649 * our init.
3650 */
3651static int bond_neigh_setup(struct net_device *dev,
3652                            struct neigh_parms *parms)
3653{
3654        /* modify only our neigh_parms */
3655        if (parms->dev == dev)
3656                parms->neigh_setup = bond_neigh_init;
3657
3658        return 0;
3659}
3660
3661/* Change the MTU of all of a master's slaves to match the master */
3662static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3663{
3664        struct bonding *bond = netdev_priv(bond_dev);
3665        struct slave *slave, *rollback_slave;
3666        struct list_head *iter;
3667        int res = 0;
3668
3669        netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3670
3671        bond_for_each_slave(bond, slave, iter) {
3672                slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n",
3673                           slave, slave->dev->netdev_ops->ndo_change_mtu);
3674
3675                res = dev_set_mtu(slave->dev, new_mtu);
3676
3677                if (res) {
3678                        /* If we failed to set the slave's mtu to the new value
3679                         * we must abort the operation even in ACTIVE_BACKUP
3680                         * mode, because if we allow the backup slaves to have
3681                         * different mtu values than the active slave we'll
3682                         * need to change their mtu when doing a failover. That
3683                         * means changing their mtu from timer context, which
3684                         * is probably not a good idea.
3685                         */
3686                        slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n",
3687                                  res, new_mtu);
3688                        goto unwind;
3689                }
3690        }
3691
3692        bond_dev->mtu = new_mtu;
3693
3694        return 0;
3695
3696unwind:
3697        /* unwind from head to the slave that failed */
3698        bond_for_each_slave(bond, rollback_slave, iter) {
3699                int tmp_res;
3700
3701                if (rollback_slave == slave)
3702                        break;
3703
3704                tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3705                if (tmp_res)
3706                        slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n",
3707                                  tmp_res);
3708        }
3709
3710        return res;
3711}
3712
3713/* Change HW address
3714 *
3715 * Note that many devices must be down to change the HW address, and
3716 * downing the master releases all slaves.  We can make bonds full of
3717 * bonding devices to test this, however.
3718 */
3719static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3720{
3721        struct bonding *bond = netdev_priv(bond_dev);
3722        struct slave *slave, *rollback_slave;
3723        struct sockaddr_storage *ss = addr, tmp_ss;
3724        struct list_head *iter;
3725        int res = 0;
3726
3727        if (BOND_MODE(bond) == BOND_MODE_ALB)
3728                return bond_alb_set_mac_address(bond_dev, addr);
3729
3730
3731        netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond);
3732
3733        /* If fail_over_mac is enabled, do nothing and return success.
3734         * Returning an error causes ifenslave to fail.
3735         */
3736        if (bond->params.fail_over_mac &&
3737            BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3738                return 0;
3739
3740        if (!is_valid_ether_addr(ss->__data))
3741                return -EADDRNOTAVAIL;
3742
3743        bond_for_each_slave(bond, slave, iter) {
3744                slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n",
3745                          __func__, slave);
3746                res = dev_set_mac_address(slave->dev, addr, NULL);
3747                if (res) {
3748                        /* TODO: consider downing the slave
3749                         * and retry ?
3750                         * User should expect communications
3751                         * breakage anyway until ARP finish
3752                         * updating, so...
3753                         */
3754                        slave_dbg(bond_dev, slave->dev, "%s: err %d\n",
3755                                  __func__, res);
3756                        goto unwind;
3757                }
3758        }
3759
3760        /* success */
3761        memcpy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len);
3762        return 0;
3763
3764unwind:
3765        memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
3766        tmp_ss.ss_family = bond_dev->type;
3767
3768        /* unwind from head to the slave that failed */
3769        bond_for_each_slave(bond, rollback_slave, iter) {
3770                int tmp_res;
3771
3772                if (rollback_slave == slave)
3773                        break;
3774
3775                tmp_res = dev_set_mac_address(rollback_slave->dev,
3776                                              (struct sockaddr *)&tmp_ss, NULL);
3777                if (tmp_res) {
3778                        slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n",
3779                                   __func__, tmp_res);
3780                }
3781        }
3782
3783        return res;
3784}
3785
3786/**
3787 * bond_xmit_slave_id - transmit skb through slave with slave_id
3788 * @bond: bonding device that is transmitting
3789 * @skb: buffer to transmit
3790 * @slave_id: slave id up to slave_cnt-1 through which to transmit
3791 *
3792 * This function tries to transmit through slave with slave_id but in case
3793 * it fails, it tries to find the first available slave for transmission.
3794 * The skb is consumed in all cases, thus the function is void.
3795 */
3796static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3797{
3798        struct list_head *iter;
3799        struct slave *slave;
3800        int i = slave_id;
3801
3802        /* Here we start from the slave with slave_id */
3803        bond_for_each_slave_rcu(bond, slave, iter) {
3804                if (--i < 0) {
3805                        if (bond_slave_can_tx(slave)) {
3806                                bond_dev_queue_xmit(bond, skb, slave->dev);
3807                                return;
3808                        }
3809                }
3810        }
3811
3812        /* Here we start from the first slave up to slave_id */
3813        i = slave_id;
3814        bond_for_each_slave_rcu(bond, slave, iter) {
3815                if (--i < 0)
3816                        break;
3817                if (bond_slave_can_tx(slave)) {
3818                        bond_dev_queue_xmit(bond, skb, slave->dev);
3819                        return;
3820                }
3821        }
3822        /* no slave that can tx has been found */
3823        bond_tx_drop(bond->dev, skb);
3824}
3825
3826/**
3827 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3828 * @bond: bonding device to use
3829 *
3830 * Based on the value of the bonding device's packets_per_slave parameter
3831 * this function generates a slave id, which is usually used as the next
3832 * slave to transmit through.
3833 */
3834static u32 bond_rr_gen_slave_id(struct bonding *bond)
3835{
3836        u32 slave_id;
3837        struct reciprocal_value reciprocal_packets_per_slave;
3838        int packets_per_slave = bond->params.packets_per_slave;
3839
3840        switch (packets_per_slave) {
3841        case 0:
3842                slave_id = prandom_u32();
3843                break;
3844        case 1:
3845                slave_id = bond->rr_tx_counter;
3846                break;
3847        default:
3848                reciprocal_packets_per_slave =
3849                        bond->params.reciprocal_packets_per_slave;
3850                slave_id = reciprocal_divide(bond->rr_tx_counter,
3851                                             reciprocal_packets_per_slave);
3852                break;
3853        }
3854        bond->rr_tx_counter++;
3855
3856        return slave_id;
3857}
3858
3859static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb,
3860                                        struct net_device *bond_dev)
3861{
3862        struct bonding *bond = netdev_priv(bond_dev);
3863        struct slave *slave;
3864        int slave_cnt;
3865        u32 slave_id;
3866
3867        /* Start with the curr_active_slave that joined the bond as the
3868         * default for sending IGMP traffic.  For failover purposes one
3869         * needs to maintain some consistency for the interface that will
3870         * send the join/membership reports.  The curr_active_slave found
3871         * will send all of this type of traffic.
3872         */
3873        if (skb->protocol == htons(ETH_P_IP)) {
3874                int noff = skb_network_offset(skb);
3875                struct iphdr *iph;
3876
3877                if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3878                        goto non_igmp;
3879
3880                iph = ip_hdr(skb);
3881                if (iph->protocol == IPPROTO_IGMP) {
3882                        slave = rcu_dereference(bond->curr_active_slave);
3883                        if (slave)
3884                                bond_dev_queue_xmit(bond, skb, slave->dev);
3885                        else
3886                                bond_xmit_slave_id(bond, skb, 0);
3887                        return NETDEV_TX_OK;
3888                }
3889        }
3890
3891non_igmp:
3892        slave_cnt = READ_ONCE(bond->slave_cnt);
3893        if (likely(slave_cnt)) {
3894                slave_id = bond_rr_gen_slave_id(bond);
3895                bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3896        } else {
3897                bond_tx_drop(bond_dev, skb);
3898        }
3899        return NETDEV_TX_OK;
3900}
3901
3902/* In active-backup mode, we know that bond->curr_active_slave is always valid if
3903 * the bond has a usable interface.
3904 */
3905static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb,
3906                                          struct net_device *bond_dev)
3907{
3908        struct bonding *bond = netdev_priv(bond_dev);
3909        struct slave *slave;
3910
3911        slave = rcu_dereference(bond->curr_active_slave);
3912        if (slave)
3913                bond_dev_queue_xmit(bond, skb, slave->dev);
3914        else
3915                bond_tx_drop(bond_dev, skb);
3916
3917        return NETDEV_TX_OK;
3918}
3919
3920/* Use this to update slave_array when (a) it's not appropriate to update
3921 * slave_array right away (note that update_slave_array() may sleep)
3922 * and / or (b) RTNL is not held.
3923 */
3924void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3925{
3926        queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3927}
3928
3929/* Slave array work handler. Holds only RTNL */
3930static void bond_slave_arr_handler(struct work_struct *work)
3931{
3932        struct bonding *bond = container_of(work, struct bonding,
3933                                            slave_arr_work.work);
3934        int ret;
3935
3936        if (!rtnl_trylock())
3937                goto err;
3938
3939        ret = bond_update_slave_arr(bond, NULL);
3940        rtnl_unlock();
3941        if (ret) {
3942                pr_warn_ratelimited("Failed to update slave array from WT\n");
3943                goto err;
3944        }
3945        return;
3946
3947err:
3948        bond_slave_arr_work_rearm(bond, 1);
3949}
3950
3951/* Build the usable slaves array in control path for modes that use xmit-hash
3952 * to determine the slave interface -
3953 * (a) BOND_MODE_8023AD
3954 * (b) BOND_MODE_XOR
3955 * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0
3956 *
3957 * The caller is expected to hold RTNL only and NO other lock!
3958 */
3959int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3960{
3961        struct slave *slave;
3962        struct list_head *iter;
3963        struct bond_up_slave *new_arr, *old_arr;
3964        int agg_id = 0;
3965        int ret = 0;
3966
3967#ifdef CONFIG_LOCKDEP
3968        WARN_ON(lockdep_is_held(&bond->mode_lock));
3969#endif
3970
3971        new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3972                          GFP_KERNEL);
3973        if (!new_arr) {
3974                ret = -ENOMEM;
3975                pr_err("Failed to build slave-array.\n");
3976                goto out;
3977        }
3978        if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3979                struct ad_info ad_info;
3980
3981                if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3982                        pr_debug("bond_3ad_get_active_agg_info failed\n");
3983                        kfree_rcu(new_arr, rcu);
3984                        /* No active aggragator means it's not safe to use
3985                         * the previous array.
3986                         */
3987                        old_arr = rtnl_dereference(bond->slave_arr);
3988                        if (old_arr) {
3989                                RCU_INIT_POINTER(bond->slave_arr, NULL);
3990                                kfree_rcu(old_arr, rcu);
3991                        }
3992                        goto out;
3993                }
3994                agg_id = ad_info.aggregator_id;
3995        }
3996        bond_for_each_slave(bond, slave, iter) {
3997                if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3998                        struct aggregator *agg;
3999
4000                        agg = SLAVE_AD_INFO(slave)->port.aggregator;
4001                        if (!agg || agg->aggregator_identifier != agg_id)
4002                                continue;
4003                }
4004                if (!bond_slave_can_tx(slave))
4005                        continue;
4006                if (skipslave == slave)
4007                        continue;
4008
4009                slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n",
4010                          new_arr->count);
4011
4012                new_arr->arr[new_arr->count++] = slave;
4013        }
4014
4015        old_arr = rtnl_dereference(bond->slave_arr);
4016        rcu_assign_pointer(bond->slave_arr, new_arr);
4017        if (old_arr)
4018                kfree_rcu(old_arr, rcu);
4019out:
4020        if (ret != 0 && skipslave) {
4021                int idx;
4022
4023                /* Rare situation where caller has asked to skip a specific
4024                 * slave but allocation failed (most likely!). BTW this is
4025                 * only possible when the call is initiated from
4026                 * __bond_release_one(). In this situation; overwrite the
4027                 * skipslave entry in the array with the last entry from the
4028                 * array to avoid a situation where the xmit path may choose
4029                 * this to-be-skipped slave to send a packet out.
4030                 */
4031                old_arr = rtnl_dereference(bond->slave_arr);
4032                for (idx = 0; old_arr != NULL && idx < old_arr->count; idx++) {
4033                        if (skipslave == old_arr->arr[idx]) {
4034                                old_arr->arr[idx] =
4035                                    old_arr->arr[old_arr->count-1];
4036                                old_arr->count--;
4037                                break;
4038                        }
4039                }
4040        }
4041        return ret;
4042}
4043
4044/* Use this Xmit function for 3AD as well as XOR modes. The current
4045 * usable slave array is formed in the control path. The xmit function
4046 * just calculates hash and sends the packet out.
4047 */
4048static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb,
4049                                     struct net_device *dev)
4050{
4051        struct bonding *bond = netdev_priv(dev);
4052        struct slave *slave;
4053        struct bond_up_slave *slaves;
4054        unsigned int count;
4055
4056        slaves = rcu_dereference(bond->slave_arr);
4057        count = slaves ? READ_ONCE(slaves->count) : 0;
4058        if (likely(count)) {
4059                slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
4060                bond_dev_queue_xmit(bond, skb, slave->dev);
4061        } else {
4062                bond_tx_drop(dev, skb);
4063        }
4064
4065        return NETDEV_TX_OK;
4066}
4067
4068/* in broadcast mode, we send everything to all usable interfaces. */
4069static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb,
4070                                       struct net_device *bond_dev)
4071{
4072        struct bonding *bond = netdev_priv(bond_dev);
4073        struct slave *slave = NULL;
4074        struct list_head *iter;
4075
4076        bond_for_each_slave_rcu(bond, slave, iter) {
4077                if (bond_is_last_slave(bond, slave))
4078                        break;
4079                if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
4080                        struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4081
4082                        if (!skb2) {
4083                                net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
4084                                                    bond_dev->name, __func__);
4085                                continue;
4086                        }
4087                        bond_dev_queue_xmit(bond, skb2, slave->dev);
4088                }
4089        }
4090        if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
4091                bond_dev_queue_xmit(bond, skb, slave->dev);
4092        else
4093                bond_tx_drop(bond_dev, skb);
4094
4095        return NETDEV_TX_OK;
4096}
4097
4098/*------------------------- Device initialization ---------------------------*/
4099
4100/* Lookup the slave that corresponds to a qid */
4101static inline int bond_slave_override(struct bonding *bond,
4102                                      struct sk_buff *skb)
4103{
4104        struct slave *slave = NULL;
4105        struct list_head *iter;
4106
4107        if (!skb_rx_queue_recorded(skb))
4108                return 1;
4109
4110        /* Find out if any slaves have the same mapping as this skb. */
4111        bond_for_each_slave_rcu(bond, slave, iter) {
4112                if (slave->queue_id == skb_get_queue_mapping(skb)) {
4113                        if (bond_slave_is_up(slave) &&
4114                            slave->link == BOND_LINK_UP) {
4115                                bond_dev_queue_xmit(bond, skb, slave->dev);
4116                                return 0;
4117                        }
4118                        /* If the slave isn't UP, use default transmit policy. */
4119                        break;
4120                }
4121        }
4122
4123        return 1;
4124}
4125
4126
4127static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
4128                             struct net_device *sb_dev)
4129{
4130        /* This helper function exists to help dev_pick_tx get the correct
4131         * destination queue.  Using a helper function skips a call to
4132         * skb_tx_hash and will put the skbs in the queue we expect on their
4133         * way down to the bonding driver.
4134         */
4135        u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4136
4137        /* Save the original txq to restore before passing to the driver */
4138        qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb);
4139
4140        if (unlikely(txq >= dev->real_num_tx_queues)) {
4141                do {
4142                        txq -= dev->real_num_tx_queues;
4143                } while (txq >= dev->real_num_tx_queues);
4144        }
4145        return txq;
4146}
4147
4148static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4149{
4150        struct bonding *bond = netdev_priv(dev);
4151
4152        if (bond_should_override_tx_queue(bond) &&
4153            !bond_slave_override(bond, skb))
4154                return NETDEV_TX_OK;
4155
4156        switch (BOND_MODE(bond)) {
4157        case BOND_MODE_ROUNDROBIN:
4158                return bond_xmit_roundrobin(skb, dev);
4159        case BOND_MODE_ACTIVEBACKUP:
4160                return bond_xmit_activebackup(skb, dev);
4161        case BOND_MODE_8023AD:
4162        case BOND_MODE_XOR:
4163                return bond_3ad_xor_xmit(skb, dev);
4164        case BOND_MODE_BROADCAST:
4165                return bond_xmit_broadcast(skb, dev);
4166        case BOND_MODE_ALB:
4167                return bond_alb_xmit(skb, dev);
4168        case BOND_MODE_TLB:
4169                return bond_tlb_xmit(skb, dev);
4170        default:
4171                /* Should never happen, mode already checked */
4172                netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4173                WARN_ON_ONCE(1);
4174                bond_tx_drop(dev, skb);
4175                return NETDEV_TX_OK;
4176        }
4177}
4178
4179static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4180{
4181        struct bonding *bond = netdev_priv(dev);
4182        netdev_tx_t ret = NETDEV_TX_OK;
4183
4184        /* If we risk deadlock from transmitting this in the
4185         * netpoll path, tell netpoll to queue the frame for later tx
4186         */
4187        if (unlikely(is_netpoll_tx_blocked(dev)))
4188                return NETDEV_TX_BUSY;
4189
4190        rcu_read_lock();
4191        if (bond_has_slaves(bond))
4192                ret = __bond_start_xmit(skb, dev);
4193        else
4194                bond_tx_drop(dev, skb);
4195        rcu_read_unlock();
4196
4197        return ret;
4198}
4199
4200static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
4201                                           struct ethtool_link_ksettings *cmd)
4202{
4203        struct bonding *bond = netdev_priv(bond_dev);
4204        unsigned long speed = 0;
4205        struct list_head *iter;
4206        struct slave *slave;
4207
4208        cmd->base.duplex = DUPLEX_UNKNOWN;
4209        cmd->base.port = PORT_OTHER;
4210
4211        /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4212         * do not need to check mode.  Though link speed might not represent
4213         * the true receive or transmit bandwidth (not all modes are symmetric)
4214         * this is an accurate maximum.
4215         */
4216        bond_for_each_slave(bond, slave, iter) {
4217                if (bond_slave_can_tx(slave)) {
4218                        if (slave->speed != SPEED_UNKNOWN)
4219                                speed += slave->speed;
4220                        if (cmd->base.duplex == DUPLEX_UNKNOWN &&
4221                            slave->duplex != DUPLEX_UNKNOWN)
4222                                cmd->base.duplex = slave->duplex;
4223                }
4224        }
4225        cmd->base.speed = speed ? : SPEED_UNKNOWN;
4226
4227        return 0;
4228}
4229
4230static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4231                                     struct ethtool_drvinfo *drvinfo)
4232{
4233        strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4234        strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4235        snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4236                 BOND_ABI_VERSION);
4237}
4238
4239static const struct ethtool_ops bond_ethtool_ops = {
4240        .get_drvinfo            = bond_ethtool_get_drvinfo,
4241        .get_link               = ethtool_op_get_link,
4242        .get_link_ksettings     = bond_ethtool_get_link_ksettings,
4243};
4244
4245static const struct net_device_ops bond_netdev_ops = {
4246        .ndo_init               = bond_init,
4247        .ndo_uninit             = bond_uninit,
4248        .ndo_open               = bond_open,
4249        .ndo_stop               = bond_close,
4250        .ndo_start_xmit         = bond_start_xmit,
4251        .ndo_select_queue       = bond_select_queue,
4252        .ndo_get_stats64        = bond_get_stats,
4253        .ndo_do_ioctl           = bond_do_ioctl,
4254        .ndo_change_rx_flags    = bond_change_rx_flags,
4255        .ndo_set_rx_mode        = bond_set_rx_mode,
4256        .ndo_change_mtu         = bond_change_mtu,
4257        .ndo_set_mac_address    = bond_set_mac_address,
4258        .ndo_neigh_setup        = bond_neigh_setup,
4259        .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4260        .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4261#ifdef CONFIG_NET_POLL_CONTROLLER
4262        .ndo_netpoll_setup      = bond_netpoll_setup,
4263        .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4264        .ndo_poll_controller    = bond_poll_controller,
4265#endif
4266        .ndo_add_slave          = bond_enslave,
4267        .ndo_del_slave          = bond_release,
4268        .ndo_fix_features       = bond_fix_features,
4269        .ndo_features_check     = passthru_features_check,
4270};
4271
4272static const struct device_type bond_type = {
4273        .name = "bond",
4274};
4275
4276static void bond_destructor(struct net_device *bond_dev)
4277{
4278        struct bonding *bond = netdev_priv(bond_dev);
4279        if (bond->wq)
4280                destroy_workqueue(bond->wq);
4281}
4282
4283void bond_setup(struct net_device *bond_dev)
4284{
4285        struct bonding *bond = netdev_priv(bond_dev);
4286
4287        spin_lock_init(&bond->mode_lock);
4288        bond->params = bonding_defaults;
4289
4290        /* Initialize pointers */
4291        bond->dev = bond_dev;
4292
4293        /* Initialize the device entry points */
4294        ether_setup(bond_dev);
4295        bond_dev->max_mtu = ETH_MAX_MTU;
4296        bond_dev->netdev_ops = &bond_netdev_ops;
4297        bond_dev->ethtool_ops = &bond_ethtool_ops;
4298
4299        bond_dev->needs_free_netdev = true;
4300        bond_dev->priv_destructor = bond_destructor;
4301
4302        SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4303
4304        /* Initialize the device options */
4305        bond_dev->flags |= IFF_MASTER;
4306        bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4307        bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4308
4309        /* don't acquire bond device's netif_tx_lock when transmitting */
4310        bond_dev->features |= NETIF_F_LLTX;
4311
4312        /* By default, we declare the bond to be fully
4313         * VLAN hardware accelerated capable. Special
4314         * care is taken in the various xmit functions
4315         * when there are slaves that are not hw accel
4316         * capable
4317         */
4318
4319        /* Don't allow bond devices to change network namespaces. */
4320        bond_dev->features |= NETIF_F_NETNS_LOCAL;
4321
4322        bond_dev->hw_features = BOND_VLAN_FEATURES |
4323                                NETIF_F_HW_VLAN_CTAG_RX |
4324                                NETIF_F_HW_VLAN_CTAG_FILTER;
4325
4326        bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL | NETIF_F_GSO_UDP_L4;
4327        bond_dev->features |= bond_dev->hw_features;
4328        bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
4329}
4330
4331/* Destroy a bonding device.
4332 * Must be under rtnl_lock when this function is called.
4333 */
4334static void bond_uninit(struct net_device *bond_dev)
4335{
4336        struct bonding *bond = netdev_priv(bond_dev);
4337        struct list_head *iter;
4338        struct slave *slave;
4339        struct bond_up_slave *arr;
4340
4341        bond_netpoll_cleanup(bond_dev);
4342
4343        /* Release the bonded slaves */
4344        bond_for_each_slave(bond, slave, iter)
4345                __bond_release_one(bond_dev, slave->dev, true, true);
4346        netdev_info(bond_dev, "Released all slaves\n");
4347
4348        arr = rtnl_dereference(bond->slave_arr);
4349        if (arr) {
4350                RCU_INIT_POINTER(bond->slave_arr, NULL);
4351                kfree_rcu(arr, rcu);
4352        }
4353
4354        list_del(&bond->bond_list);
4355
4356        lockdep_unregister_key(&bond->stats_lock_key);
4357        bond_debug_unregister(bond);
4358}
4359
4360/*------------------------- Module initialization ---------------------------*/
4361
4362static int bond_check_params(struct bond_params *params)
4363{
4364        int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4365        struct bond_opt_value newval;
4366        const struct bond_opt_value *valptr;
4367        int arp_all_targets_value = 0;
4368        u16 ad_actor_sys_prio = 0;
4369        u16 ad_user_port_key = 0;
4370        __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
4371        int arp_ip_count;
4372        int bond_mode   = BOND_MODE_ROUNDROBIN;
4373        int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
4374        int lacp_fast = 0;
4375        int tlb_dynamic_lb;
4376
4377        /* Convert string parameters. */
4378        if (mode) {
4379                bond_opt_initstr(&newval, mode);
4380                valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4381                if (!valptr) {
4382                        pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4383                        return -EINVAL;
4384                }
4385                bond_mode = valptr->value;
4386        }
4387
4388        if (xmit_hash_policy) {
4389                if (bond_mode == BOND_MODE_ROUNDROBIN ||
4390                    bond_mode == BOND_MODE_ACTIVEBACKUP ||
4391                    bond_mode == BOND_MODE_BROADCAST) {
4392                        pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4393                                bond_mode_name(bond_mode));
4394                } else {
4395                        bond_opt_initstr(&newval, xmit_hash_policy);
4396                        valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4397                                                &newval);
4398                        if (!valptr) {
4399                                pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4400                                       xmit_hash_policy);
4401                                return -EINVAL;
4402                        }
4403                        xmit_hashtype = valptr->value;
4404                }
4405        }
4406
4407        if (lacp_rate) {
4408                if (bond_mode != BOND_MODE_8023AD) {
4409                        pr_info("lacp_rate param is irrelevant in mode %s\n",
4410                                bond_mode_name(bond_mode));
4411                } else {
4412                        bond_opt_initstr(&newval, lacp_rate);
4413                        valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4414                                                &newval);
4415                        if (!valptr) {
4416                                pr_err("Error: Invalid lacp rate \"%s\"\n",
4417                                       lacp_rate);
4418                                return -EINVAL;
4419                        }
4420                        lacp_fast = valptr->value;
4421                }
4422        }
4423
4424        if (ad_select) {
4425                bond_opt_initstr(&newval, ad_select);
4426                valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4427                                        &newval);
4428                if (!valptr) {
4429                        pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4430                        return -EINVAL;
4431                }
4432                params->ad_select = valptr->value;
4433                if (bond_mode != BOND_MODE_8023AD)
4434                        pr_warn("ad_select param only affects 802.3ad mode\n");
4435        } else {
4436                params->ad_select = BOND_AD_STABLE;
4437        }
4438
4439        if (max_bonds < 0) {
4440                pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4441                        max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4442                max_bonds = BOND_DEFAULT_MAX_BONDS;
4443        }
4444
4445        if (miimon < 0) {
4446                pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4447                        miimon, INT_MAX);
4448                miimon = 0;
4449        }
4450
4451        if (updelay < 0) {
4452                pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4453                        updelay, INT_MAX);
4454                updelay = 0;
4455        }
4456
4457        if (downdelay < 0) {
4458                pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4459                        downdelay, INT_MAX);
4460                downdelay = 0;
4461        }
4462
4463        if ((use_carrier != 0) && (use_carrier != 1)) {
4464                pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4465                        use_carrier);
4466                use_carrier = 1;
4467        }
4468
4469        if (num_peer_notif < 0 || num_peer_notif > 255) {
4470                pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4471                        num_peer_notif);
4472                num_peer_notif = 1;
4473        }
4474
4475        /* reset values for 802.3ad/TLB/ALB */
4476        if (!bond_mode_uses_arp(bond_mode)) {
4477                if (!miimon) {
4478                        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");
4479                        pr_warn("Forcing miimon to 100msec\n");
4480                        miimon = BOND_DEFAULT_MIIMON;
4481                }
4482        }
4483
4484        if (tx_queues < 1 || tx_queues > 255) {
4485                pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4486                        tx_queues, BOND_DEFAULT_TX_QUEUES);
4487                tx_queues = BOND_DEFAULT_TX_QUEUES;
4488        }
4489
4490        if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4491                pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4492                        all_slaves_active);
4493                all_slaves_active = 0;
4494        }
4495
4496        if (resend_igmp < 0 || resend_igmp > 255) {
4497                pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4498                        resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4499                resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4500        }
4501
4502        bond_opt_initval(&newval, packets_per_slave);
4503        if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4504                pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4505                        packets_per_slave, USHRT_MAX);
4506                packets_per_slave = 1;
4507        }
4508
4509        if (bond_mode == BOND_MODE_ALB) {
4510                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",
4511                          updelay);
4512        }
4513
4514        if (!miimon) {
4515                if (updelay || downdelay) {
4516                        /* just warn the user the up/down delay will have
4517                         * no effect since miimon is zero...
4518                         */
4519                        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",
4520                                updelay, downdelay);
4521                }
4522        } else {
4523                /* don't allow arp monitoring */
4524                if (arp_interval) {
4525                        pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4526                                miimon, arp_interval);
4527                        arp_interval = 0;
4528                }
4529
4530                if ((updelay % miimon) != 0) {
4531                        pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4532                                updelay, miimon, (updelay / miimon) * miimon);
4533                }
4534
4535                updelay /= miimon;
4536
4537                if ((downdelay % miimon) != 0) {
4538                        pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4539                                downdelay, miimon,
4540                                (downdelay / miimon) * miimon);
4541                }
4542
4543                downdelay /= miimon;
4544        }
4545
4546        if (arp_interval < 0) {
4547                pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4548                        arp_interval, INT_MAX);
4549                arp_interval = 0;
4550        }
4551
4552        for (arp_ip_count = 0, i = 0;
4553             (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4554                __be32 ip;
4555
4556                /* not a complete check, but good enough to catch mistakes */
4557                if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4558                    !bond_is_ip_target_ok(ip)) {
4559                        pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4560                                arp_ip_target[i]);
4561                        arp_interval = 0;
4562                } else {
4563                        if (bond_get_targets_ip(arp_target, ip) == -1)
4564                                arp_target[arp_ip_count++] = ip;
4565                        else
4566                                pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4567                                        &ip);
4568                }
4569        }
4570
4571        if (arp_interval && !arp_ip_count) {
4572                /* don't allow arping if no arp_ip_target given... */
4573                pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4574                        arp_interval);
4575                arp_interval = 0;
4576        }
4577
4578        if (arp_validate) {
4579                if (!arp_interval) {
4580                        pr_err("arp_validate requires arp_interval\n");
4581                        return -EINVAL;
4582                }
4583
4584                bond_opt_initstr(&newval, arp_validate);
4585                valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4586                                        &newval);
4587                if (!valptr) {
4588                        pr_err("Error: invalid arp_validate \"%s\"\n",
4589                               arp_validate);
4590                        return -EINVAL;
4591                }
4592                arp_validate_value = valptr->value;
4593        } else {
4594                arp_validate_value = 0;
4595        }
4596
4597        if (arp_all_targets) {
4598                bond_opt_initstr(&newval, arp_all_targets);
4599                valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4600                                        &newval);
4601                if (!valptr) {
4602                        pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4603                               arp_all_targets);
4604                        arp_all_targets_value = 0;
4605                } else {
4606                        arp_all_targets_value = valptr->value;
4607                }
4608        }
4609
4610        if (miimon) {
4611                pr_info("MII link monitoring set to %d ms\n", miimon);
4612        } else if (arp_interval) {
4613                valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4614                                          arp_validate_value);
4615                pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4616                        arp_interval, valptr->string, arp_ip_count);
4617
4618                for (i = 0; i < arp_ip_count; i++)
4619                        pr_cont(" %s", arp_ip_target[i]);
4620
4621                pr_cont("\n");
4622
4623        } else if (max_bonds) {
4624                /* miimon and arp_interval not set, we need one so things
4625                 * work as expected, see bonding.txt for details
4626                 */
4627                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");
4628        }
4629
4630        if (primary && !bond_mode_uses_primary(bond_mode)) {
4631                /* currently, using a primary only makes sense
4632                 * in active backup, TLB or ALB modes
4633                 */
4634                pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4635                        primary, bond_mode_name(bond_mode));
4636                primary = NULL;
4637        }
4638
4639        if (primary && primary_reselect) {
4640                bond_opt_initstr(&newval, primary_reselect);
4641                valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4642                                        &newval);
4643                if (!valptr) {
4644                        pr_err("Error: Invalid primary_reselect \"%s\"\n",
4645                               primary_reselect);
4646                        return -EINVAL;
4647                }
4648                primary_reselect_value = valptr->value;
4649        } else {
4650                primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4651        }
4652
4653        if (fail_over_mac) {
4654                bond_opt_initstr(&newval, fail_over_mac);
4655                valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4656                                        &newval);
4657                if (!valptr) {
4658                        pr_err("Error: invalid fail_over_mac \"%s\"\n",
4659                               fail_over_mac);
4660                        return -EINVAL;
4661                }
4662                fail_over_mac_value = valptr->value;
4663                if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4664                        pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4665        } else {
4666                fail_over_mac_value = BOND_FOM_NONE;
4667        }
4668
4669        bond_opt_initstr(&newval, "default");
4670        valptr = bond_opt_parse(
4671                        bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
4672                                     &newval);
4673        if (!valptr) {
4674                pr_err("Error: No ad_actor_sys_prio default value");
4675                return -EINVAL;
4676        }
4677        ad_actor_sys_prio = valptr->value;
4678
4679        valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
4680                                &newval);
4681        if (!valptr) {
4682                pr_err("Error: No ad_user_port_key default value");
4683                return -EINVAL;
4684        }
4685        ad_user_port_key = valptr->value;
4686
4687        bond_opt_initstr(&newval, "default");
4688        valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);
4689        if (!valptr) {
4690                pr_err("Error: No tlb_dynamic_lb default value");
4691                return -EINVAL;
4692        }
4693        tlb_dynamic_lb = valptr->value;
4694
4695        if (lp_interval == 0) {
4696                pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4697                        INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4698                lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4699        }
4700
4701        /* fill params struct with the proper values */
4702        params->mode = bond_mode;
4703        params->xmit_policy = xmit_hashtype;
4704        params->miimon = miimon;
4705        params->num_peer_notif = num_peer_notif;
4706        params->arp_interval = arp_interval;
4707        params->arp_validate = arp_validate_value;
4708        params->arp_all_targets = arp_all_targets_value;
4709        params->updelay = updelay;
4710        params->downdelay = downdelay;
4711        params->peer_notif_delay = 0;
4712        params->use_carrier = use_carrier;
4713        params->lacp_fast = lacp_fast;
4714        params->primary[0] = 0;
4715        params->primary_reselect = primary_reselect_value;
4716        params->fail_over_mac = fail_over_mac_value;
4717        params->tx_queues = tx_queues;
4718        params->all_slaves_active = all_slaves_active;
4719        params->resend_igmp = resend_igmp;
4720        params->min_links = min_links;
4721        params->lp_interval = lp_interval;
4722        params->packets_per_slave = packets_per_slave;
4723        params->tlb_dynamic_lb = tlb_dynamic_lb;
4724        params->ad_actor_sys_prio = ad_actor_sys_prio;
4725        eth_zero_addr(params->ad_actor_system);
4726        params->ad_user_port_key = ad_user_port_key;
4727        if (packets_per_slave > 0) {
4728                params->reciprocal_packets_per_slave =
4729                        reciprocal_value(packets_per_slave);
4730        } else {
4731                /* reciprocal_packets_per_slave is unused if
4732                 * packets_per_slave is 0 or 1, just initialize it
4733                 */
4734                params->reciprocal_packets_per_slave =
4735                        (struct reciprocal_value) { 0 };
4736        }
4737
4738        if (primary) {
4739                strncpy(params->primary, primary, IFNAMSIZ);
4740                params->primary[IFNAMSIZ - 1] = 0;
4741        }
4742
4743        memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4744
4745        return 0;
4746}
4747
4748/* Called from registration process */
4749static int bond_init(struct net_device *bond_dev)
4750{
4751        struct bonding *bond = netdev_priv(bond_dev);
4752        struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4753
4754        netdev_dbg(bond_dev, "Begin bond_init\n");
4755
4756        bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
4757        if (!bond->wq)
4758                return -ENOMEM;
4759
4760        spin_lock_init(&bond->stats_lock);
4761        lockdep_register_key(&bond->stats_lock_key);
4762        lockdep_set_class(&bond->stats_lock, &bond->stats_lock_key);
4763
4764        list_add_tail(&bond->bond_list, &bn->dev_list);
4765
4766        bond_prepare_sysfs_group(bond);
4767
4768        bond_debug_register(bond);
4769
4770        /* Ensure valid dev_addr */
4771        if (is_zero_ether_addr(bond_dev->dev_addr) &&
4772            bond_dev->addr_assign_type == NET_ADDR_PERM)
4773                eth_hw_addr_random(bond_dev);
4774
4775        return 0;
4776}
4777
4778unsigned int bond_get_num_tx_queues(void)
4779{
4780        return tx_queues;
4781}
4782
4783/* Create a new bond based on the specified name and bonding parameters.
4784 * If name is NULL, obtain a suitable "bond%d" name for us.
4785 * Caller must NOT hold rtnl_lock; we need to release it here before we
4786 * set up our sysfs entries.
4787 */
4788int bond_create(struct net *net, const char *name)
4789{
4790        struct net_device *bond_dev;
4791        struct bonding *bond;
4792        struct alb_bond_info *bond_info;
4793        int res;
4794
4795        rtnl_lock();
4796
4797        bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4798                                   name ? name : "bond%d", NET_NAME_UNKNOWN,
4799                                   bond_setup, tx_queues);
4800        if (!bond_dev) {
4801                pr_err("%s: eek! can't alloc netdev!\n", name);
4802                rtnl_unlock();
4803                return -ENOMEM;
4804        }
4805
4806        /*
4807         * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4808         * It is set to 0 by default which is wrong.
4809         */
4810        bond = netdev_priv(bond_dev);
4811        bond_info = &(BOND_ALB_INFO(bond));
4812        bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4813
4814        dev_net_set(bond_dev, net);
4815        bond_dev->rtnl_link_ops = &bond_link_ops;
4816
4817        res = register_netdevice(bond_dev);
4818
4819        netif_carrier_off(bond_dev);
4820
4821        bond_work_init_all(bond);
4822
4823        rtnl_unlock();
4824        if (res < 0)
4825                free_netdev(bond_dev);
4826        return res;
4827}
4828
4829static int __net_init bond_net_init(struct net *net)
4830{
4831        struct bond_net *bn = net_generic(net, bond_net_id);
4832
4833        bn->net = net;
4834        INIT_LIST_HEAD(&bn->dev_list);
4835
4836        bond_create_proc_dir(bn);
4837        bond_create_sysfs(bn);
4838
4839        return 0;
4840}
4841
4842static void __net_exit bond_net_exit(struct net *net)
4843{
4844        struct bond_net *bn = net_generic(net, bond_net_id);
4845        struct bonding *bond, *tmp_bond;
4846        LIST_HEAD(list);
4847
4848        bond_destroy_sysfs(bn);
4849
4850        /* Kill off any bonds created after unregistering bond rtnl ops */
4851        rtnl_lock();
4852        list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4853                unregister_netdevice_queue(bond->dev, &list);
4854        unregister_netdevice_many(&list);
4855        rtnl_unlock();
4856
4857        bond_destroy_proc_dir(bn);
4858}
4859
4860static struct pernet_operations bond_net_ops = {
4861        .init = bond_net_init,
4862        .exit = bond_net_exit,
4863        .id   = &bond_net_id,
4864        .size = sizeof(struct bond_net),
4865};
4866
4867static int __init bonding_init(void)
4868{
4869        int i;
4870        int res;
4871
4872        pr_info("%s", bond_version);
4873
4874        res = bond_check_params(&bonding_defaults);
4875        if (res)
4876                goto out;
4877
4878        res = register_pernet_subsys(&bond_net_ops);
4879        if (res)
4880                goto out;
4881
4882        res = bond_netlink_init();
4883        if (res)
4884                goto err_link;
4885
4886        bond_create_debugfs();
4887
4888        for (i = 0; i < max_bonds; i++) {
4889                res = bond_create(&init_net, NULL);
4890                if (res)
4891                        goto err;
4892        }
4893
4894        register_netdevice_notifier(&bond_netdev_notifier);
4895out:
4896        return res;
4897err:
4898        bond_destroy_debugfs();
4899        bond_netlink_fini();
4900err_link:
4901        unregister_pernet_subsys(&bond_net_ops);
4902        goto out;
4903
4904}
4905
4906static void __exit bonding_exit(void)
4907{
4908        unregister_netdevice_notifier(&bond_netdev_notifier);
4909
4910        bond_destroy_debugfs();
4911
4912        bond_netlink_fini();
4913        unregister_pernet_subsys(&bond_net_ops);
4914
4915#ifdef CONFIG_NET_POLL_CONTROLLER
4916        /* Make sure we don't have an imbalance on our netpoll blocking */
4917        WARN_ON(atomic_read(&netpoll_block_tx));
4918#endif
4919}
4920
4921module_init(bonding_init);
4922module_exit(bonding_exit);
4923MODULE_LICENSE("GPL");
4924MODULE_VERSION(DRV_VERSION);
4925MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4926MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4927