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