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/icmp.h>
  45#include <linux/icmpv6.h>
  46#include <linux/tcp.h>
  47#include <linux/udp.h>
  48#include <linux/slab.h>
  49#include <linux/string.h>
  50#include <linux/init.h>
  51#include <linux/timer.h>
  52#include <linux/socket.h>
  53#include <linux/ctype.h>
  54#include <linux/inet.h>
  55#include <linux/bitops.h>
  56#include <linux/io.h>
  57#include <asm/dma.h>
  58#include <linux/uaccess.h>
  59#include <linux/errno.h>
  60#include <linux/netdevice.h>
  61#include <linux/inetdevice.h>
  62#include <linux/igmp.h>
  63#include <linux/etherdevice.h>
  64#include <linux/skbuff.h>
  65#include <net/sock.h>
  66#include <linux/rtnetlink.h>
  67#include <linux/smp.h>
  68#include <linux/if_ether.h>
  69#include <net/arp.h>
  70#include <linux/mii.h>
  71#include <linux/ethtool.h>
  72#include <linux/if_vlan.h>
  73#include <linux/if_bonding.h>
  74#include <linux/jiffies.h>
  75#include <linux/preempt.h>
  76#include <net/route.h>
  77#include <net/net_namespace.h>
  78#include <net/netns/generic.h>
  79#include <net/pkt_sched.h>
  80#include <linux/rculist.h>
  81#include <net/flow_dissector.h>
  82#include <net/xfrm.h>
  83#include <net/bonding.h>
  84#include <net/bond_3ad.h>
  85#include <net/bond_alb.h>
  86
  87#include "bonding_priv.h"
  88
  89/*---------------------------- Module parameters ----------------------------*/
  90
  91/* monitor all links that often (in milliseconds). <=0 disables monitoring */
  92
  93static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  94static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  95static int num_peer_notif = 1;
  96static int miimon;
  97static int updelay;
  98static int downdelay;
  99static int use_carrier  = 1;
 100static char *mode;
 101static char *primary;
 102static char *primary_reselect;
 103static char *lacp_rate;
 104static int min_links;
 105static char *ad_select;
 106static char *xmit_hash_policy;
 107static int arp_interval;
 108static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 109static char *arp_validate;
 110static char *arp_all_targets;
 111static char *fail_over_mac;
 112static int all_slaves_active;
 113static struct bond_params bonding_defaults;
 114static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 115static int packets_per_slave = 1;
 116static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
 117
 118module_param(max_bonds, int, 0);
 119MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 120module_param(tx_queues, int, 0);
 121MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 122module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 123MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 124                               "failover event (alias of num_unsol_na)");
 125module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 126MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 127                               "failover event (alias of num_grat_arp)");
 128module_param(miimon, int, 0);
 129MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 130module_param(updelay, int, 0);
 131MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 132module_param(downdelay, int, 0);
 133MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 134                            "in milliseconds");
 135module_param(use_carrier, int, 0);
 136MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 137                              "0 for off, 1 for on (default)");
 138module_param(mode, charp, 0);
 139MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 140                       "1 for active-backup, 2 for balance-xor, "
 141                       "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 142                       "6 for balance-alb");
 143module_param(primary, charp, 0);
 144MODULE_PARM_DESC(primary, "Primary network device to use");
 145module_param(primary_reselect, charp, 0);
 146MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 147                                   "once it comes up; "
 148                                   "0 for always (default), "
 149                                   "1 for only if speed of primary is "
 150                                   "better, "
 151                                   "2 for only on active slave "
 152                                   "failure");
 153module_param(lacp_rate, charp, 0);
 154MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 155                            "0 for slow, 1 for fast");
 156module_param(ad_select, charp, 0);
 157MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; "
 158                            "0 for stable (default), 1 for bandwidth, "
 159                            "2 for count");
 160module_param(min_links, int, 0);
 161MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 162
 163module_param(xmit_hash_policy, charp, 0);
 164MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; "
 165                                   "0 for layer 2 (default), 1 for layer 3+4, "
 166                                   "2 for layer 2+3, 3 for encap layer 2+3, "
 167                                   "4 for encap layer 3+4");
 168module_param(arp_interval, int, 0);
 169MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 170module_param_array(arp_ip_target, charp, NULL, 0);
 171MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 172module_param(arp_validate, charp, 0);
 173MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 174                               "0 for none (default), 1 for active, "
 175                               "2 for backup, 3 for all");
 176module_param(arp_all_targets, charp, 0);
 177MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
 178module_param(fail_over_mac, charp, 0);
 179MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 180                                "the same MAC; 0 for none (default), "
 181                                "1 for active, 2 for follow");
 182module_param(all_slaves_active, int, 0);
 183MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
 184                                     "by setting active flag for all slaves; "
 185                                     "0 for never (default), 1 for always.");
 186module_param(resend_igmp, int, 0);
 187MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 188                              "link failure");
 189module_param(packets_per_slave, int, 0);
 190MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
 191                                    "mode; 0 for a random slave, 1 packet per "
 192                                    "slave (default), >1 packets per slave.");
 193module_param(lp_interval, uint, 0);
 194MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
 195                              "the bonding driver sends learning packets to "
 196                              "each slaves peer switch. The default is 1.");
 197
 198/*----------------------------- Global variables ----------------------------*/
 199
 200#ifdef CONFIG_NET_POLL_CONTROLLER
 201atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 202#endif
 203
 204unsigned int bond_net_id __read_mostly;
 205
 206static const struct flow_dissector_key flow_keys_bonding_keys[] = {
 207        {
 208                .key_id = FLOW_DISSECTOR_KEY_CONTROL,
 209                .offset = offsetof(struct flow_keys, control),
 210        },
 211        {
 212                .key_id = FLOW_DISSECTOR_KEY_BASIC,
 213                .offset = offsetof(struct flow_keys, basic),
 214        },
 215        {
 216                .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
 217                .offset = offsetof(struct flow_keys, addrs.v4addrs),
 218        },
 219        {
 220                .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
 221                .offset = offsetof(struct flow_keys, addrs.v6addrs),
 222        },
 223        {
 224                .key_id = FLOW_DISSECTOR_KEY_TIPC,
 225                .offset = offsetof(struct flow_keys, addrs.tipckey),
 226        },
 227        {
 228                .key_id = FLOW_DISSECTOR_KEY_PORTS,
 229                .offset = offsetof(struct flow_keys, ports),
 230        },
 231        {
 232                .key_id = FLOW_DISSECTOR_KEY_ICMP,
 233                .offset = offsetof(struct flow_keys, icmp),
 234        },
 235        {
 236                .key_id = FLOW_DISSECTOR_KEY_VLAN,
 237                .offset = offsetof(struct flow_keys, vlan),
 238        },
 239        {
 240                .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
 241                .offset = offsetof(struct flow_keys, tags),
 242        },
 243        {
 244                .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
 245                .offset = offsetof(struct flow_keys, keyid),
 246        },
 247};
 248
 249static struct flow_dissector flow_keys_bonding __read_mostly;
 250
 251/*-------------------------- Forward declarations ---------------------------*/
 252
 253static int bond_init(struct net_device *bond_dev);
 254static void bond_uninit(struct net_device *bond_dev);
 255static void bond_get_stats(struct net_device *bond_dev,
 256                           struct rtnl_link_stats64 *stats);
 257static void bond_slave_arr_handler(struct work_struct *work);
 258static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
 259                                  int mod);
 260static void bond_netdev_notify_work(struct work_struct *work);
 261
 262/*---------------------------- General routines -----------------------------*/
 263
 264const char *bond_mode_name(int mode)
 265{
 266        static const char *names[] = {
 267                [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 268                [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 269                [BOND_MODE_XOR] = "load balancing (xor)",
 270                [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 271                [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 272                [BOND_MODE_TLB] = "transmit load balancing",
 273                [BOND_MODE_ALB] = "adaptive load balancing",
 274        };
 275
 276        if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
 277                return "unknown";
 278
 279        return names[mode];
 280}
 281
 282/**
 283 * bond_dev_queue_xmit - Prepare skb for xmit.
 284 *
 285 * @bond: bond device that got this skb for tx.
 286 * @skb: hw accel VLAN tagged skb to transmit
 287 * @slave_dev: slave that is supposed to xmit this skbuff
 288 */
 289netdev_tx_t bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 290                        struct net_device *slave_dev)
 291{
 292        skb->dev = slave_dev;
 293
 294        BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 295                     sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 296        skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
 297
 298        if (unlikely(netpoll_tx_running(bond->dev)))
 299                return bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 300
 301        return dev_queue_xmit(skb);
 302}
 303
 304/*---------------------------------- VLAN -----------------------------------*/
 305
 306/* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 307 * We don't protect the slave list iteration with a lock because:
 308 * a. This operation is performed in IOCTL context,
 309 * b. The operation is protected by the RTNL semaphore in the 8021q code,
 310 * c. Holding a lock with BH disabled while directly calling a base driver
 311 *    entry point is generally a BAD idea.
 312 *
 313 * The design of synchronization/protection for this operation in the 8021q
 314 * module is good for one or more VLAN devices over a single physical device
 315 * and cannot be extended for a teaming solution like bonding, so there is a
 316 * potential race condition here where a net device from the vlan group might
 317 * be referenced (either by a base driver or the 8021q code) while it is being
 318 * removed from the system. However, it turns out we're not making matters
 319 * worse, and if it works for regular VLAN usage it will work here too.
 320*/
 321
 322/**
 323 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 324 * @bond_dev: bonding net device that got called
 325 * @proto: network protocol ID
 326 * @vid: vlan id being added
 327 */
 328static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
 329                                __be16 proto, u16 vid)
 330{
 331        struct bonding *bond = netdev_priv(bond_dev);
 332        struct slave *slave, *rollback_slave;
 333        struct list_head *iter;
 334        int res;
 335
 336        bond_for_each_slave(bond, slave, iter) {
 337                res = vlan_vid_add(slave->dev, proto, vid);
 338                if (res)
 339                        goto unwind;
 340        }
 341
 342        return 0;
 343
 344unwind:
 345        /* unwind to the slave that failed */
 346        bond_for_each_slave(bond, rollback_slave, iter) {
 347                if (rollback_slave == slave)
 348                        break;
 349
 350                vlan_vid_del(rollback_slave->dev, proto, vid);
 351        }
 352
 353        return res;
 354}
 355
 356/**
 357 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 358 * @bond_dev: bonding net device that got called
 359 * @proto: network protocol ID
 360 * @vid: vlan id being removed
 361 */
 362static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 363                                 __be16 proto, u16 vid)
 364{
 365        struct bonding *bond = netdev_priv(bond_dev);
 366        struct list_head *iter;
 367        struct slave *slave;
 368
 369        bond_for_each_slave(bond, slave, iter)
 370                vlan_vid_del(slave->dev, proto, vid);
 371
 372        if (bond_is_lb(bond))
 373                bond_alb_clear_vlan(bond, vid);
 374
 375        return 0;
 376}
 377
 378/*---------------------------------- XFRM -----------------------------------*/
 379
 380#ifdef CONFIG_XFRM_OFFLOAD
 381/**
 382 * bond_ipsec_add_sa - program device with a security association
 383 * @xs: pointer to transformer state struct
 384 **/
 385static int bond_ipsec_add_sa(struct xfrm_state *xs)
 386{
 387        struct net_device *bond_dev = xs->xso.dev;
 388        struct bonding *bond;
 389        struct slave *slave;
 390
 391        if (!bond_dev)
 392                return -EINVAL;
 393
 394        bond = netdev_priv(bond_dev);
 395        slave = rcu_dereference(bond->curr_active_slave);
 396        xs->xso.real_dev = slave->dev;
 397        bond->xs = xs;
 398
 399        if (!(slave->dev->xfrmdev_ops
 400              && slave->dev->xfrmdev_ops->xdo_dev_state_add)) {
 401                slave_warn(bond_dev, slave->dev, "Slave does not support ipsec offload\n");
 402                return -EINVAL;
 403        }
 404
 405        return slave->dev->xfrmdev_ops->xdo_dev_state_add(xs);
 406}
 407
 408/**
 409 * bond_ipsec_del_sa - clear out this specific SA
 410 * @xs: pointer to transformer state struct
 411 **/
 412static void bond_ipsec_del_sa(struct xfrm_state *xs)
 413{
 414        struct net_device *bond_dev = xs->xso.dev;
 415        struct bonding *bond;
 416        struct slave *slave;
 417
 418        if (!bond_dev)
 419                return;
 420
 421        bond = netdev_priv(bond_dev);
 422        slave = rcu_dereference(bond->curr_active_slave);
 423
 424        if (!slave)
 425                return;
 426
 427        xs->xso.real_dev = slave->dev;
 428
 429        if (!(slave->dev->xfrmdev_ops
 430              && slave->dev->xfrmdev_ops->xdo_dev_state_delete)) {
 431                slave_warn(bond_dev, slave->dev, "%s: no slave xdo_dev_state_delete\n", __func__);
 432                return;
 433        }
 434
 435        slave->dev->xfrmdev_ops->xdo_dev_state_delete(xs);
 436}
 437
 438/**
 439 * bond_ipsec_offload_ok - can this packet use the xfrm hw offload
 440 * @skb: current data packet
 441 * @xs: pointer to transformer state struct
 442 **/
 443static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
 444{
 445        struct net_device *bond_dev = xs->xso.dev;
 446        struct bonding *bond = netdev_priv(bond_dev);
 447        struct slave *curr_active = rcu_dereference(bond->curr_active_slave);
 448        struct net_device *slave_dev = curr_active->dev;
 449
 450        if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)
 451                return true;
 452
 453        if (!(slave_dev->xfrmdev_ops
 454              && slave_dev->xfrmdev_ops->xdo_dev_offload_ok)) {
 455                slave_warn(bond_dev, slave_dev, "%s: no slave xdo_dev_offload_ok\n", __func__);
 456                return false;
 457        }
 458
 459        xs->xso.real_dev = slave_dev;
 460        return slave_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs);
 461}
 462
 463static const struct xfrmdev_ops bond_xfrmdev_ops = {
 464        .xdo_dev_state_add = bond_ipsec_add_sa,
 465        .xdo_dev_state_delete = bond_ipsec_del_sa,
 466        .xdo_dev_offload_ok = bond_ipsec_offload_ok,
 467};
 468#endif /* CONFIG_XFRM_OFFLOAD */
 469
 470/*------------------------------- Link status -------------------------------*/
 471
 472/* Set the carrier state for the master according to the state of its
 473 * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 474 * do special 802.3ad magic.
 475 *
 476 * Returns zero if carrier state does not change, nonzero if it does.
 477 */
 478int bond_set_carrier(struct bonding *bond)
 479{
 480        struct list_head *iter;
 481        struct slave *slave;
 482
 483        if (!bond_has_slaves(bond))
 484                goto down;
 485
 486        if (BOND_MODE(bond) == BOND_MODE_8023AD)
 487                return bond_3ad_set_carrier(bond);
 488
 489        bond_for_each_slave(bond, slave, iter) {
 490                if (slave->link == BOND_LINK_UP) {
 491                        if (!netif_carrier_ok(bond->dev)) {
 492                                netif_carrier_on(bond->dev);
 493                                return 1;
 494                        }
 495                        return 0;
 496                }
 497        }
 498
 499down:
 500        if (netif_carrier_ok(bond->dev)) {
 501                netif_carrier_off(bond->dev);
 502                return 1;
 503        }
 504        return 0;
 505}
 506
 507/* Get link speed and duplex from the slave's base driver
 508 * using ethtool. If for some reason the call fails or the
 509 * values are invalid, set speed and duplex to -1,
 510 * and return. Return 1 if speed or duplex settings are
 511 * UNKNOWN; 0 otherwise.
 512 */
 513static int bond_update_speed_duplex(struct slave *slave)
 514{
 515        struct net_device *slave_dev = slave->dev;
 516        struct ethtool_link_ksettings ecmd;
 517        int res;
 518
 519        slave->speed = SPEED_UNKNOWN;
 520        slave->duplex = DUPLEX_UNKNOWN;
 521
 522        res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
 523        if (res < 0)
 524                return 1;
 525        if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
 526                return 1;
 527        switch (ecmd.base.duplex) {
 528        case DUPLEX_FULL:
 529        case DUPLEX_HALF:
 530                break;
 531        default:
 532                return 1;
 533        }
 534
 535        slave->speed = ecmd.base.speed;
 536        slave->duplex = ecmd.base.duplex;
 537
 538        return 0;
 539}
 540
 541const char *bond_slave_link_status(s8 link)
 542{
 543        switch (link) {
 544        case BOND_LINK_UP:
 545                return "up";
 546        case BOND_LINK_FAIL:
 547                return "going down";
 548        case BOND_LINK_DOWN:
 549                return "down";
 550        case BOND_LINK_BACK:
 551                return "going back";
 552        default:
 553                return "unknown";
 554        }
 555}
 556
 557/* if <dev> supports MII link status reporting, check its link status.
 558 *
 559 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 560 * depending upon the setting of the use_carrier parameter.
 561 *
 562 * Return either BMSR_LSTATUS, meaning that the link is up (or we
 563 * can't tell and just pretend it is), or 0, meaning that the link is
 564 * down.
 565 *
 566 * If reporting is non-zero, instead of faking link up, return -1 if
 567 * both ETHTOOL and MII ioctls fail (meaning the device does not
 568 * support them).  If use_carrier is set, return whatever it says.
 569 * It'd be nice if there was a good way to tell if a driver supports
 570 * netif_carrier, but there really isn't.
 571 */
 572static int bond_check_dev_link(struct bonding *bond,
 573                               struct net_device *slave_dev, int reporting)
 574{
 575        const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 576        int (*ioctl)(struct net_device *, struct ifreq *, int);
 577        struct ifreq ifr;
 578        struct mii_ioctl_data *mii;
 579
 580        if (!reporting && !netif_running(slave_dev))
 581                return 0;
 582
 583        if (bond->params.use_carrier)
 584                return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 585
 586        /* Try to get link status using Ethtool first. */
 587        if (slave_dev->ethtool_ops->get_link)
 588                return slave_dev->ethtool_ops->get_link(slave_dev) ?
 589                        BMSR_LSTATUS : 0;
 590
 591        /* Ethtool can't be used, fallback to MII ioctls. */
 592        ioctl = slave_ops->ndo_do_ioctl;
 593        if (ioctl) {
 594                /* TODO: set pointer to correct ioctl on a per team member
 595                 *       bases to make this more efficient. that is, once
 596                 *       we determine the correct ioctl, we will always
 597                 *       call it and not the others for that team
 598                 *       member.
 599                 */
 600
 601                /* We cannot assume that SIOCGMIIPHY will also read a
 602                 * register; not all network drivers (e.g., e100)
 603                 * support that.
 604                 */
 605
 606                /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 607                strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 608                mii = if_mii(&ifr);
 609                if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 610                        mii->reg_num = MII_BMSR;
 611                        if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
 612                                return mii->val_out & BMSR_LSTATUS;
 613                }
 614        }
 615
 616        /* If reporting, report that either there's no dev->do_ioctl,
 617         * or both SIOCGMIIREG and get_link failed (meaning that we
 618         * cannot report link status).  If not reporting, pretend
 619         * we're ok.
 620         */
 621        return reporting ? -1 : BMSR_LSTATUS;
 622}
 623
 624/*----------------------------- Multicast list ------------------------------*/
 625
 626/* Push the promiscuity flag down to appropriate slaves */
 627static int bond_set_promiscuity(struct bonding *bond, int inc)
 628{
 629        struct list_head *iter;
 630        int err = 0;
 631
 632        if (bond_uses_primary(bond)) {
 633                struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 634
 635                if (curr_active)
 636                        err = dev_set_promiscuity(curr_active->dev, inc);
 637        } else {
 638                struct slave *slave;
 639
 640                bond_for_each_slave(bond, slave, iter) {
 641                        err = dev_set_promiscuity(slave->dev, inc);
 642                        if (err)
 643                                return err;
 644                }
 645        }
 646        return err;
 647}
 648
 649/* Push the allmulti flag down to all slaves */
 650static int bond_set_allmulti(struct bonding *bond, int inc)
 651{
 652        struct list_head *iter;
 653        int err = 0;
 654
 655        if (bond_uses_primary(bond)) {
 656                struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 657
 658                if (curr_active)
 659                        err = dev_set_allmulti(curr_active->dev, inc);
 660        } else {
 661                struct slave *slave;
 662
 663                bond_for_each_slave(bond, slave, iter) {
 664                        err = dev_set_allmulti(slave->dev, inc);
 665                        if (err)
 666                                return err;
 667                }
 668        }
 669        return err;
 670}
 671
 672/* Retrieve the list of registered multicast addresses for the bonding
 673 * device and retransmit an IGMP JOIN request to the current active
 674 * slave.
 675 */
 676static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 677{
 678        struct bonding *bond = container_of(work, struct bonding,
 679                                            mcast_work.work);
 680
 681        if (!rtnl_trylock()) {
 682                queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 683                return;
 684        }
 685        call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
 686
 687        if (bond->igmp_retrans > 1) {
 688                bond->igmp_retrans--;
 689                queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 690        }
 691        rtnl_unlock();
 692}
 693
 694/* Flush bond's hardware addresses from slave */
 695static void bond_hw_addr_flush(struct net_device *bond_dev,
 696                               struct net_device *slave_dev)
 697{
 698        struct bonding *bond = netdev_priv(bond_dev);
 699
 700        dev_uc_unsync(slave_dev, bond_dev);
 701        dev_mc_unsync(slave_dev, bond_dev);
 702
 703        if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 704                /* del lacpdu mc addr from mc list */
 705                u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 706
 707                dev_mc_del(slave_dev, lacpdu_multicast);
 708        }
 709}
 710
 711/*--------------------------- Active slave change ---------------------------*/
 712
 713/* Update the hardware address list and promisc/allmulti for the new and
 714 * old active slaves (if any).  Modes that are not using primary keep all
 715 * slaves up date at all times; only the modes that use primary need to call
 716 * this function to swap these settings during a failover.
 717 */
 718static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
 719                              struct slave *old_active)
 720{
 721        if (old_active) {
 722                if (bond->dev->flags & IFF_PROMISC)
 723                        dev_set_promiscuity(old_active->dev, -1);
 724
 725                if (bond->dev->flags & IFF_ALLMULTI)
 726                        dev_set_allmulti(old_active->dev, -1);
 727
 728                bond_hw_addr_flush(bond->dev, old_active->dev);
 729        }
 730
 731        if (new_active) {
 732                /* FIXME: Signal errors upstream. */
 733                if (bond->dev->flags & IFF_PROMISC)
 734                        dev_set_promiscuity(new_active->dev, 1);
 735
 736                if (bond->dev->flags & IFF_ALLMULTI)
 737                        dev_set_allmulti(new_active->dev, 1);
 738
 739                netif_addr_lock_bh(bond->dev);
 740                dev_uc_sync(new_active->dev, bond->dev);
 741                dev_mc_sync(new_active->dev, bond->dev);
 742                netif_addr_unlock_bh(bond->dev);
 743        }
 744}
 745
 746/**
 747 * bond_set_dev_addr - clone slave's address to bond
 748 * @bond_dev: bond net device
 749 * @slave_dev: slave net device
 750 *
 751 * Should be called with RTNL held.
 752 */
 753static int bond_set_dev_addr(struct net_device *bond_dev,
 754                             struct net_device *slave_dev)
 755{
 756        int err;
 757
 758        slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
 759                  bond_dev, slave_dev, slave_dev->addr_len);
 760        err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL);
 761        if (err)
 762                return err;
 763
 764        memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
 765        bond_dev->addr_assign_type = NET_ADDR_STOLEN;
 766        call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
 767        return 0;
 768}
 769
 770static struct slave *bond_get_old_active(struct bonding *bond,
 771                                         struct slave *new_active)
 772{
 773        struct slave *slave;
 774        struct list_head *iter;
 775
 776        bond_for_each_slave(bond, slave, iter) {
 777                if (slave == new_active)
 778                        continue;
 779
 780                if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
 781                        return slave;
 782        }
 783
 784        return NULL;
 785}
 786
 787/* bond_do_fail_over_mac
 788 *
 789 * Perform special MAC address swapping for fail_over_mac settings
 790 *
 791 * Called with RTNL
 792 */
 793static void bond_do_fail_over_mac(struct bonding *bond,
 794                                  struct slave *new_active,
 795                                  struct slave *old_active)
 796{
 797        u8 tmp_mac[MAX_ADDR_LEN];
 798        struct sockaddr_storage ss;
 799        int rv;
 800
 801        switch (bond->params.fail_over_mac) {
 802        case BOND_FOM_ACTIVE:
 803                if (new_active) {
 804                        rv = bond_set_dev_addr(bond->dev, new_active->dev);
 805                        if (rv)
 806                                slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n",
 807                                          -rv);
 808                }
 809                break;
 810        case BOND_FOM_FOLLOW:
 811                /* if new_active && old_active, swap them
 812                 * if just old_active, do nothing (going to no active slave)
 813                 * if just new_active, set new_active to bond's MAC
 814                 */
 815                if (!new_active)
 816                        return;
 817
 818                if (!old_active)
 819                        old_active = bond_get_old_active(bond, new_active);
 820
 821                if (old_active) {
 822                        bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr,
 823                                          new_active->dev->addr_len);
 824                        bond_hw_addr_copy(ss.__data,
 825                                          old_active->dev->dev_addr,
 826                                          old_active->dev->addr_len);
 827                        ss.ss_family = new_active->dev->type;
 828                } else {
 829                        bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
 830                                          bond->dev->addr_len);
 831                        ss.ss_family = bond->dev->type;
 832                }
 833
 834                rv = dev_set_mac_address(new_active->dev,
 835                                         (struct sockaddr *)&ss, NULL);
 836                if (rv) {
 837                        slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n",
 838                                  -rv);
 839                        goto out;
 840                }
 841
 842                if (!old_active)
 843                        goto out;
 844
 845                bond_hw_addr_copy(ss.__data, tmp_mac,
 846                                  new_active->dev->addr_len);
 847                ss.ss_family = old_active->dev->type;
 848
 849                rv = dev_set_mac_address(old_active->dev,
 850                                         (struct sockaddr *)&ss, NULL);
 851                if (rv)
 852                        slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n",
 853                                  -rv);
 854out:
 855                break;
 856        default:
 857                netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
 858                           bond->params.fail_over_mac);
 859                break;
 860        }
 861
 862}
 863
 864static struct slave *bond_choose_primary_or_current(struct bonding *bond)
 865{
 866        struct slave *prim = rtnl_dereference(bond->primary_slave);
 867        struct slave *curr = rtnl_dereference(bond->curr_active_slave);
 868
 869        if (!prim || prim->link != BOND_LINK_UP) {
 870                if (!curr || curr->link != BOND_LINK_UP)
 871                        return NULL;
 872                return curr;
 873        }
 874
 875        if (bond->force_primary) {
 876                bond->force_primary = false;
 877                return prim;
 878        }
 879
 880        if (!curr || curr->link != BOND_LINK_UP)
 881                return prim;
 882
 883        /* At this point, prim and curr are both up */
 884        switch (bond->params.primary_reselect) {
 885        case BOND_PRI_RESELECT_ALWAYS:
 886                return prim;
 887        case BOND_PRI_RESELECT_BETTER:
 888                if (prim->speed < curr->speed)
 889                        return curr;
 890                if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
 891                        return curr;
 892                return prim;
 893        case BOND_PRI_RESELECT_FAILURE:
 894                return curr;
 895        default:
 896                netdev_err(bond->dev, "impossible primary_reselect %d\n",
 897                           bond->params.primary_reselect);
 898                return curr;
 899        }
 900}
 901
 902/**
 903 * bond_find_best_slave - select the best available slave to be the active one
 904 * @bond: our bonding struct
 905 */
 906static struct slave *bond_find_best_slave(struct bonding *bond)
 907{
 908        struct slave *slave, *bestslave = NULL;
 909        struct list_head *iter;
 910        int mintime = bond->params.updelay;
 911
 912        slave = bond_choose_primary_or_current(bond);
 913        if (slave)
 914                return slave;
 915
 916        bond_for_each_slave(bond, slave, iter) {
 917                if (slave->link == BOND_LINK_UP)
 918                        return slave;
 919                if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
 920                    slave->delay < mintime) {
 921                        mintime = slave->delay;
 922                        bestslave = slave;
 923                }
 924        }
 925
 926        return bestslave;
 927}
 928
 929static bool bond_should_notify_peers(struct bonding *bond)
 930{
 931        struct slave *slave;
 932
 933        rcu_read_lock();
 934        slave = rcu_dereference(bond->curr_active_slave);
 935        rcu_read_unlock();
 936
 937        netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
 938                   slave ? slave->dev->name : "NULL");
 939
 940        if (!slave || !bond->send_peer_notif ||
 941            bond->send_peer_notif %
 942            max(1, bond->params.peer_notif_delay) != 0 ||
 943            !netif_carrier_ok(bond->dev) ||
 944            test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
 945                return false;
 946
 947        return true;
 948}
 949
 950/**
 951 * change_active_interface - change the active slave into the specified one
 952 * @bond: our bonding struct
 953 * @new_active: the new slave to make the active one
 954 *
 955 * Set the new slave to the bond's settings and unset them on the old
 956 * curr_active_slave.
 957 * Setting include flags, mc-list, promiscuity, allmulti, etc.
 958 *
 959 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 960 * because it is apparently the best available slave we have, even though its
 961 * updelay hasn't timed out yet.
 962 *
 963 * Caller must hold RTNL.
 964 */
 965void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 966{
 967        struct slave *old_active;
 968
 969        ASSERT_RTNL();
 970
 971        old_active = rtnl_dereference(bond->curr_active_slave);
 972
 973        if (old_active == new_active)
 974                return;
 975
 976#ifdef CONFIG_XFRM_OFFLOAD
 977        if (old_active && bond->xs)
 978                bond_ipsec_del_sa(bond->xs);
 979#endif /* CONFIG_XFRM_OFFLOAD */
 980
 981        if (new_active) {
 982                new_active->last_link_up = jiffies;
 983
 984                if (new_active->link == BOND_LINK_BACK) {
 985                        if (bond_uses_primary(bond)) {
 986                                slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n",
 987                                           (bond->params.updelay - new_active->delay) * bond->params.miimon);
 988                        }
 989
 990                        new_active->delay = 0;
 991                        bond_set_slave_link_state(new_active, BOND_LINK_UP,
 992                                                  BOND_SLAVE_NOTIFY_NOW);
 993
 994                        if (BOND_MODE(bond) == BOND_MODE_8023AD)
 995                                bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
 996
 997                        if (bond_is_lb(bond))
 998                                bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
 999                } else {
1000                        if (bond_uses_primary(bond)) {
1001                                slave_info(bond->dev, new_active->dev, "making interface the new active one\n");
1002                        }
1003                }
1004        }
1005
1006        if (bond_uses_primary(bond))
1007                bond_hw_addr_swap(bond, new_active, old_active);
1008
1009        if (bond_is_lb(bond)) {
1010                bond_alb_handle_active_change(bond, new_active);
1011                if (old_active)
1012                        bond_set_slave_inactive_flags(old_active,
1013                                                      BOND_SLAVE_NOTIFY_NOW);
1014                if (new_active)
1015                        bond_set_slave_active_flags(new_active,
1016                                                    BOND_SLAVE_NOTIFY_NOW);
1017        } else {
1018                rcu_assign_pointer(bond->curr_active_slave, new_active);
1019        }
1020
1021        if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
1022                if (old_active)
1023                        bond_set_slave_inactive_flags(old_active,
1024                                                      BOND_SLAVE_NOTIFY_NOW);
1025
1026                if (new_active) {
1027                        bool should_notify_peers = false;
1028
1029                        bond_set_slave_active_flags(new_active,
1030                                                    BOND_SLAVE_NOTIFY_NOW);
1031
1032                        if (bond->params.fail_over_mac)
1033                                bond_do_fail_over_mac(bond, new_active,
1034                                                      old_active);
1035
1036                        if (netif_running(bond->dev)) {
1037                                bond->send_peer_notif =
1038                                        bond->params.num_peer_notif *
1039                                        max(1, bond->params.peer_notif_delay);
1040                                should_notify_peers =
1041                                        bond_should_notify_peers(bond);
1042                        }
1043
1044                        call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
1045                        if (should_notify_peers) {
1046                                bond->send_peer_notif--;
1047                                call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
1048                                                         bond->dev);
1049                        }
1050                }
1051        }
1052
1053#ifdef CONFIG_XFRM_OFFLOAD
1054        if (new_active && bond->xs) {
1055                xfrm_dev_state_flush(dev_net(bond->dev), bond->dev, true);
1056                bond_ipsec_add_sa(bond->xs);
1057        }
1058#endif /* CONFIG_XFRM_OFFLOAD */
1059
1060        /* resend IGMP joins since active slave has changed or
1061         * all were sent on curr_active_slave.
1062         * resend only if bond is brought up with the affected
1063         * bonding modes and the retransmission is enabled
1064         */
1065        if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1066            ((bond_uses_primary(bond) && new_active) ||
1067             BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
1068                bond->igmp_retrans = bond->params.resend_igmp;
1069                queue_delayed_work(bond->wq, &bond->mcast_work, 1);
1070        }
1071}
1072
1073/**
1074 * bond_select_active_slave - select a new active slave, if needed
1075 * @bond: our bonding struct
1076 *
1077 * This functions should be called when one of the following occurs:
1078 * - The old curr_active_slave has been released or lost its link.
1079 * - The primary_slave has got its link back.
1080 * - A slave has got its link back and there's no old curr_active_slave.
1081 *
1082 * Caller must hold RTNL.
1083 */
1084void bond_select_active_slave(struct bonding *bond)
1085{
1086        struct slave *best_slave;
1087        int rv;
1088
1089        ASSERT_RTNL();
1090
1091        best_slave = bond_find_best_slave(bond);
1092        if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
1093                bond_change_active_slave(bond, best_slave);
1094                rv = bond_set_carrier(bond);
1095                if (!rv)
1096                        return;
1097
1098                if (netif_carrier_ok(bond->dev))
1099                        netdev_info(bond->dev, "active interface up!\n");
1100                else
1101                        netdev_info(bond->dev, "now running without any active interface!\n");
1102        }
1103}
1104
1105#ifdef CONFIG_NET_POLL_CONTROLLER
1106static inline int slave_enable_netpoll(struct slave *slave)
1107{
1108        struct netpoll *np;
1109        int err = 0;
1110
1111        np = kzalloc(sizeof(*np), GFP_KERNEL);
1112        err = -ENOMEM;
1113        if (!np)
1114                goto out;
1115
1116        err = __netpoll_setup(np, slave->dev);
1117        if (err) {
1118                kfree(np);
1119                goto out;
1120        }
1121        slave->np = np;
1122out:
1123        return err;
1124}
1125static inline void slave_disable_netpoll(struct slave *slave)
1126{
1127        struct netpoll *np = slave->np;
1128
1129        if (!np)
1130                return;
1131
1132        slave->np = NULL;
1133
1134        __netpoll_free(np);
1135}
1136
1137static void bond_poll_controller(struct net_device *bond_dev)
1138{
1139        struct bonding *bond = netdev_priv(bond_dev);
1140        struct slave *slave = NULL;
1141        struct list_head *iter;
1142        struct ad_info ad_info;
1143
1144        if (BOND_MODE(bond) == BOND_MODE_8023AD)
1145                if (bond_3ad_get_active_agg_info(bond, &ad_info))
1146                        return;
1147
1148        bond_for_each_slave_rcu(bond, slave, iter) {
1149                if (!bond_slave_is_up(slave))
1150                        continue;
1151
1152                if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1153                        struct aggregator *agg =
1154                            SLAVE_AD_INFO(slave)->port.aggregator;
1155
1156                        if (agg &&
1157                            agg->aggregator_identifier != ad_info.aggregator_id)
1158                                continue;
1159                }
1160
1161                netpoll_poll_dev(slave->dev);
1162        }
1163}
1164
1165static void bond_netpoll_cleanup(struct net_device *bond_dev)
1166{
1167        struct bonding *bond = netdev_priv(bond_dev);
1168        struct list_head *iter;
1169        struct slave *slave;
1170
1171        bond_for_each_slave(bond, slave, iter)
1172                if (bond_slave_is_up(slave))
1173                        slave_disable_netpoll(slave);
1174}
1175
1176static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1177{
1178        struct bonding *bond = netdev_priv(dev);
1179        struct list_head *iter;
1180        struct slave *slave;
1181        int err = 0;
1182
1183        bond_for_each_slave(bond, slave, iter) {
1184                err = slave_enable_netpoll(slave);
1185                if (err) {
1186                        bond_netpoll_cleanup(dev);
1187                        break;
1188                }
1189        }
1190        return err;
1191}
1192#else
1193static inline int slave_enable_netpoll(struct slave *slave)
1194{
1195        return 0;
1196}
1197static inline void slave_disable_netpoll(struct slave *slave)
1198{
1199}
1200static void bond_netpoll_cleanup(struct net_device *bond_dev)
1201{
1202}
1203#endif
1204
1205/*---------------------------------- IOCTL ----------------------------------*/
1206
1207static netdev_features_t bond_fix_features(struct net_device *dev,
1208                                           netdev_features_t features)
1209{
1210        struct bonding *bond = netdev_priv(dev);
1211        struct list_head *iter;
1212        netdev_features_t mask;
1213        struct slave *slave;
1214
1215        mask = features;
1216
1217        features &= ~NETIF_F_ONE_FOR_ALL;
1218        features |= NETIF_F_ALL_FOR_ALL;
1219
1220        bond_for_each_slave(bond, slave, iter) {
1221                features = netdev_increment_features(features,
1222                                                     slave->dev->features,
1223                                                     mask);
1224        }
1225        features = netdev_add_tso_features(features, mask);
1226
1227        return features;
1228}
1229
1230#define BOND_VLAN_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1231                                 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1232                                 NETIF_F_HIGHDMA | NETIF_F_LRO)
1233
1234#define BOND_ENC_FEATURES       (NETIF_F_HW_CSUM | NETIF_F_SG | \
1235                                 NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
1236
1237#define BOND_MPLS_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1238                                 NETIF_F_ALL_TSO)
1239
1240
1241static void bond_compute_features(struct bonding *bond)
1242{
1243        unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1244                                        IFF_XMIT_DST_RELEASE_PERM;
1245        netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1246        netdev_features_t enc_features  = BOND_ENC_FEATURES;
1247#ifdef CONFIG_XFRM_OFFLOAD
1248        netdev_features_t xfrm_features  = BOND_XFRM_FEATURES;
1249#endif /* CONFIG_XFRM_OFFLOAD */
1250        netdev_features_t mpls_features  = BOND_MPLS_FEATURES;
1251        struct net_device *bond_dev = bond->dev;
1252        struct list_head *iter;
1253        struct slave *slave;
1254        unsigned short max_hard_header_len = ETH_HLEN;
1255        unsigned int gso_max_size = GSO_MAX_SIZE;
1256        u16 gso_max_segs = GSO_MAX_SEGS;
1257
1258        if (!bond_has_slaves(bond))
1259                goto done;
1260        vlan_features &= NETIF_F_ALL_FOR_ALL;
1261        mpls_features &= NETIF_F_ALL_FOR_ALL;
1262
1263        bond_for_each_slave(bond, slave, iter) {
1264                vlan_features = netdev_increment_features(vlan_features,
1265                        slave->dev->vlan_features, BOND_VLAN_FEATURES);
1266
1267                enc_features = netdev_increment_features(enc_features,
1268                                                         slave->dev->hw_enc_features,
1269                                                         BOND_ENC_FEATURES);
1270
1271#ifdef CONFIG_XFRM_OFFLOAD
1272                xfrm_features = netdev_increment_features(xfrm_features,
1273                                                          slave->dev->hw_enc_features,
1274                                                          BOND_XFRM_FEATURES);
1275#endif /* CONFIG_XFRM_OFFLOAD */
1276
1277                mpls_features = netdev_increment_features(mpls_features,
1278                                                          slave->dev->mpls_features,
1279                                                          BOND_MPLS_FEATURES);
1280
1281                dst_release_flag &= slave->dev->priv_flags;
1282                if (slave->dev->hard_header_len > max_hard_header_len)
1283                        max_hard_header_len = slave->dev->hard_header_len;
1284
1285                gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1286                gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1287        }
1288        bond_dev->hard_header_len = max_hard_header_len;
1289
1290done:
1291        bond_dev->vlan_features = vlan_features;
1292        bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
1293                                    NETIF_F_HW_VLAN_CTAG_TX |
1294                                    NETIF_F_HW_VLAN_STAG_TX |
1295                                    NETIF_F_GSO_UDP_L4;
1296#ifdef CONFIG_XFRM_OFFLOAD
1297        bond_dev->hw_enc_features |= xfrm_features;
1298#endif /* CONFIG_XFRM_OFFLOAD */
1299        bond_dev->mpls_features = mpls_features;
1300        bond_dev->gso_max_segs = gso_max_segs;
1301        netif_set_gso_max_size(bond_dev, gso_max_size);
1302
1303        bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1304        if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1305            dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1306                bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1307
1308        netdev_change_features(bond_dev);
1309}
1310
1311static void bond_setup_by_slave(struct net_device *bond_dev,
1312                                struct net_device *slave_dev)
1313{
1314        bond_dev->header_ops        = slave_dev->header_ops;
1315
1316        bond_dev->type              = slave_dev->type;
1317        bond_dev->hard_header_len   = slave_dev->hard_header_len;
1318        bond_dev->needed_headroom   = slave_dev->needed_headroom;
1319        bond_dev->addr_len          = slave_dev->addr_len;
1320
1321        memcpy(bond_dev->broadcast, slave_dev->broadcast,
1322                slave_dev->addr_len);
1323}
1324
1325/* On bonding slaves other than the currently active slave, suppress
1326 * duplicates except for alb non-mcast/bcast.
1327 */
1328static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1329                                            struct slave *slave,
1330                                            struct bonding *bond)
1331{
1332        if (bond_is_slave_inactive(slave)) {
1333                if (BOND_MODE(bond) == BOND_MODE_ALB &&
1334                    skb->pkt_type != PACKET_BROADCAST &&
1335                    skb->pkt_type != PACKET_MULTICAST)
1336                        return false;
1337                return true;
1338        }
1339        return false;
1340}
1341
1342static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1343{
1344        struct sk_buff *skb = *pskb;
1345        struct slave *slave;
1346        struct bonding *bond;
1347        int (*recv_probe)(const struct sk_buff *, struct bonding *,
1348                          struct slave *);
1349        int ret = RX_HANDLER_ANOTHER;
1350
1351        skb = skb_share_check(skb, GFP_ATOMIC);
1352        if (unlikely(!skb))
1353                return RX_HANDLER_CONSUMED;
1354
1355        *pskb = skb;
1356
1357        slave = bond_slave_get_rcu(skb->dev);
1358        bond = slave->bond;
1359
1360        recv_probe = READ_ONCE(bond->recv_probe);
1361        if (recv_probe) {
1362                ret = recv_probe(skb, bond, slave);
1363                if (ret == RX_HANDLER_CONSUMED) {
1364                        consume_skb(skb);
1365                        return ret;
1366                }
1367        }
1368
1369        /*
1370         * For packets determined by bond_should_deliver_exact_match() call to
1371         * be suppressed we want to make an exception for link-local packets.
1372         * This is necessary for e.g. LLDP daemons to be able to monitor
1373         * inactive slave links without being forced to bind to them
1374         * explicitly.
1375         *
1376         * At the same time, packets that are passed to the bonding master
1377         * (including link-local ones) can have their originating interface
1378         * determined via PACKET_ORIGDEV socket option.
1379         */
1380        if (bond_should_deliver_exact_match(skb, slave, bond)) {
1381                if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
1382                        return RX_HANDLER_PASS;
1383                return RX_HANDLER_EXACT;
1384        }
1385
1386        skb->dev = bond->dev;
1387
1388        if (BOND_MODE(bond) == BOND_MODE_ALB &&
1389            netif_is_bridge_port(bond->dev) &&
1390            skb->pkt_type == PACKET_HOST) {
1391
1392                if (unlikely(skb_cow_head(skb,
1393                                          skb->data - skb_mac_header(skb)))) {
1394                        kfree_skb(skb);
1395                        return RX_HANDLER_CONSUMED;
1396                }
1397                bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,
1398                                  bond->dev->addr_len);
1399        }
1400
1401        return ret;
1402}
1403
1404static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1405{
1406        switch (BOND_MODE(bond)) {
1407        case BOND_MODE_ROUNDROBIN:
1408                return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1409        case BOND_MODE_ACTIVEBACKUP:
1410                return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1411        case BOND_MODE_BROADCAST:
1412                return NETDEV_LAG_TX_TYPE_BROADCAST;
1413        case BOND_MODE_XOR:
1414        case BOND_MODE_8023AD:
1415                return NETDEV_LAG_TX_TYPE_HASH;
1416        default:
1417                return NETDEV_LAG_TX_TYPE_UNKNOWN;
1418        }
1419}
1420
1421static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond,
1422                                               enum netdev_lag_tx_type type)
1423{
1424        if (type != NETDEV_LAG_TX_TYPE_HASH)
1425                return NETDEV_LAG_HASH_NONE;
1426
1427        switch (bond->params.xmit_policy) {
1428        case BOND_XMIT_POLICY_LAYER2:
1429                return NETDEV_LAG_HASH_L2;
1430        case BOND_XMIT_POLICY_LAYER34:
1431                return NETDEV_LAG_HASH_L34;
1432        case BOND_XMIT_POLICY_LAYER23:
1433                return NETDEV_LAG_HASH_L23;
1434        case BOND_XMIT_POLICY_ENCAP23:
1435                return NETDEV_LAG_HASH_E23;
1436        case BOND_XMIT_POLICY_ENCAP34:
1437                return NETDEV_LAG_HASH_E34;
1438        default:
1439                return NETDEV_LAG_HASH_UNKNOWN;
1440        }
1441}
1442
1443static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave,
1444                                      struct netlink_ext_ack *extack)
1445{
1446        struct netdev_lag_upper_info lag_upper_info;
1447        enum netdev_lag_tx_type type;
1448
1449        type = bond_lag_tx_type(bond);
1450        lag_upper_info.tx_type = type;
1451        lag_upper_info.hash_type = bond_lag_hash_type(bond, type);
1452
1453        return netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1454                                            &lag_upper_info, extack);
1455}
1456
1457static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1458{
1459        netdev_upper_dev_unlink(slave->dev, bond->dev);
1460        slave->dev->flags &= ~IFF_SLAVE;
1461}
1462
1463static void slave_kobj_release(struct kobject *kobj)
1464{
1465        struct slave *slave = to_slave(kobj);
1466        struct bonding *bond = bond_get_bond_by_slave(slave);
1467
1468        cancel_delayed_work_sync(&slave->notify_work);
1469        if (BOND_MODE(bond) == BOND_MODE_8023AD)
1470                kfree(SLAVE_AD_INFO(slave));
1471
1472        kfree(slave);
1473}
1474
1475static struct kobj_type slave_ktype = {
1476        .release = slave_kobj_release,
1477#ifdef CONFIG_SYSFS
1478        .sysfs_ops = &slave_sysfs_ops,
1479#endif
1480};
1481
1482static int bond_kobj_init(struct slave *slave)
1483{
1484        int err;
1485
1486        err = kobject_init_and_add(&slave->kobj, &slave_ktype,
1487                                   &(slave->dev->dev.kobj), "bonding_slave");
1488        if (err)
1489                kobject_put(&slave->kobj);
1490
1491        return err;
1492}
1493
1494static struct slave *bond_alloc_slave(struct bonding *bond,
1495                                      struct net_device *slave_dev)
1496{
1497        struct slave *slave = NULL;
1498
1499        slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1500        if (!slave)
1501                return NULL;
1502
1503        slave->bond = bond;
1504        slave->dev = slave_dev;
1505
1506        if (bond_kobj_init(slave))
1507                return NULL;
1508
1509        if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1510                SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1511                                               GFP_KERNEL);
1512                if (!SLAVE_AD_INFO(slave)) {
1513                        kobject_put(&slave->kobj);
1514                        return NULL;
1515                }
1516        }
1517        INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work);
1518
1519        return slave;
1520}
1521
1522static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1523{
1524        info->bond_mode = BOND_MODE(bond);
1525        info->miimon = bond->params.miimon;
1526        info->num_slaves = bond->slave_cnt;
1527}
1528
1529static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1530{
1531        strcpy(info->slave_name, slave->dev->name);
1532        info->link = slave->link;
1533        info->state = bond_slave_state(slave);
1534        info->link_failure_count = slave->link_failure_count;
1535}
1536
1537static void bond_netdev_notify_work(struct work_struct *_work)
1538{
1539        struct slave *slave = container_of(_work, struct slave,
1540                                           notify_work.work);
1541
1542        if (rtnl_trylock()) {
1543                struct netdev_bonding_info binfo;
1544
1545                bond_fill_ifslave(slave, &binfo.slave);
1546                bond_fill_ifbond(slave->bond, &binfo.master);
1547                netdev_bonding_info_change(slave->dev, &binfo);
1548                rtnl_unlock();
1549        } else {
1550                queue_delayed_work(slave->bond->wq, &slave->notify_work, 1);
1551        }
1552}
1553
1554void bond_queue_slave_event(struct slave *slave)
1555{
1556        queue_delayed_work(slave->bond->wq, &slave->notify_work, 0);
1557}
1558
1559void bond_lower_state_changed(struct slave *slave)
1560{
1561        struct netdev_lag_lower_state_info info;
1562
1563        info.link_up = slave->link == BOND_LINK_UP ||
1564                       slave->link == BOND_LINK_FAIL;
1565        info.tx_enabled = bond_is_active_slave(slave);
1566        netdev_lower_state_changed(slave->dev, &info);
1567}
1568
1569/* enslave device <slave> to bond device <master> */
1570int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
1571                 struct netlink_ext_ack *extack)
1572{
1573        struct bonding *bond = netdev_priv(bond_dev);
1574        const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1575        struct slave *new_slave = NULL, *prev_slave;
1576        struct sockaddr_storage ss;
1577        int link_reporting;
1578        int res = 0, i;
1579
1580        if (!bond->params.use_carrier &&
1581            slave_dev->ethtool_ops->get_link == NULL &&
1582            slave_ops->ndo_do_ioctl == NULL) {
1583                slave_warn(bond_dev, slave_dev, "no link monitoring support\n");
1584        }
1585
1586        /* already in-use? */
1587        if (netdev_is_rx_handler_busy(slave_dev)) {
1588                NL_SET_ERR_MSG(extack, "Device is in use and cannot be enslaved");
1589                slave_err(bond_dev, slave_dev,
1590                          "Error: Device is in use and cannot be enslaved\n");
1591                return -EBUSY;
1592        }
1593
1594        if (bond_dev == slave_dev) {
1595                NL_SET_ERR_MSG(extack, "Cannot enslave bond to itself.");
1596                netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1597                return -EPERM;
1598        }
1599
1600        /* vlan challenged mutual exclusion */
1601        /* no need to lock since we're protected by rtnl_lock */
1602        if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1603                slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n");
1604                if (vlan_uses_dev(bond_dev)) {
1605                        NL_SET_ERR_MSG(extack, "Can not enslave VLAN challenged device to VLAN enabled bond");
1606                        slave_err(bond_dev, slave_dev, "Error: cannot enslave VLAN challenged slave on VLAN enabled bond\n");
1607                        return -EPERM;
1608                } else {
1609                        slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n");
1610                }
1611        } else {
1612                slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n");
1613        }
1614
1615        if (slave_dev->features & NETIF_F_HW_ESP)
1616                slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n");
1617
1618        /* Old ifenslave binaries are no longer supported.  These can
1619         * be identified with moderate accuracy by the state of the slave:
1620         * the current ifenslave will set the interface down prior to
1621         * enslaving it; the old ifenslave will not.
1622         */
1623        if (slave_dev->flags & IFF_UP) {
1624                NL_SET_ERR_MSG(extack, "Device can not be enslaved while up");
1625                slave_err(bond_dev, slave_dev, "slave is up - this may be due to an out of date ifenslave\n");
1626                return -EPERM;
1627        }
1628
1629        /* set bonding device ether type by slave - bonding netdevices are
1630         * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1631         * there is a need to override some of the type dependent attribs/funcs.
1632         *
1633         * bond ether type mutual exclusion - don't allow slaves of dissimilar
1634         * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1635         */
1636        if (!bond_has_slaves(bond)) {
1637                if (bond_dev->type != slave_dev->type) {
1638                        slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n",
1639                                  bond_dev->type, slave_dev->type);
1640
1641                        res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1642                                                       bond_dev);
1643                        res = notifier_to_errno(res);
1644                        if (res) {
1645                                slave_err(bond_dev, slave_dev, "refused to change device type\n");
1646                                return -EBUSY;
1647                        }
1648
1649                        /* Flush unicast and multicast addresses */
1650                        dev_uc_flush(bond_dev);
1651                        dev_mc_flush(bond_dev);
1652
1653                        if (slave_dev->type != ARPHRD_ETHER)
1654                                bond_setup_by_slave(bond_dev, slave_dev);
1655                        else {
1656                                ether_setup(bond_dev);
1657                                bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1658                        }
1659
1660                        call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1661                                                 bond_dev);
1662                }
1663        } else if (bond_dev->type != slave_dev->type) {
1664                NL_SET_ERR_MSG(extack, "Device type is different from other slaves");
1665                slave_err(bond_dev, slave_dev, "ether type (%d) is different from other slaves (%d), can not enslave it\n",
1666                          slave_dev->type, bond_dev->type);
1667                return -EINVAL;
1668        }
1669
1670        if (slave_dev->type == ARPHRD_INFINIBAND &&
1671            BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1672                NL_SET_ERR_MSG(extack, "Only active-backup mode is supported for infiniband slaves");
1673                slave_warn(bond_dev, slave_dev, "Type (%d) supports only active-backup mode\n",
1674                           slave_dev->type);
1675                res = -EOPNOTSUPP;
1676                goto err_undo_flags;
1677        }
1678
1679        if (!slave_ops->ndo_set_mac_address ||
1680            slave_dev->type == ARPHRD_INFINIBAND) {
1681                slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n");
1682                if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1683                    bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1684                        if (!bond_has_slaves(bond)) {
1685                                bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1686                                slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n");
1687                        } else {
1688                                NL_SET_ERR_MSG(extack, "Slave device does not support setting the MAC address, but fail_over_mac is not set to active");
1689                                slave_err(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active\n");
1690                                res = -EOPNOTSUPP;
1691                                goto err_undo_flags;
1692                        }
1693                }
1694        }
1695
1696        call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1697
1698        /* If this is the first slave, then we need to set the master's hardware
1699         * address to be the same as the slave's.
1700         */
1701        if (!bond_has_slaves(bond) &&
1702            bond->dev->addr_assign_type == NET_ADDR_RANDOM) {
1703                res = bond_set_dev_addr(bond->dev, slave_dev);
1704                if (res)
1705                        goto err_undo_flags;
1706        }
1707
1708        new_slave = bond_alloc_slave(bond, slave_dev);
1709        if (!new_slave) {
1710                res = -ENOMEM;
1711                goto err_undo_flags;
1712        }
1713
1714        /* Set the new_slave's queue_id to be zero.  Queue ID mapping
1715         * is set via sysfs or module option if desired.
1716         */
1717        new_slave->queue_id = 0;
1718
1719        /* Save slave's original mtu and then set it to match the bond */
1720        new_slave->original_mtu = slave_dev->mtu;
1721        res = dev_set_mtu(slave_dev, bond->dev->mtu);
1722        if (res) {
1723                slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res);
1724                goto err_free;
1725        }
1726
1727        /* Save slave's original ("permanent") mac address for modes
1728         * that need it, and for restoring it upon release, and then
1729         * set it to the master's address
1730         */
1731        bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,
1732                          slave_dev->addr_len);
1733
1734        if (!bond->params.fail_over_mac ||
1735            BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1736                /* Set slave to master's mac address.  The application already
1737                 * set the master's mac address to that of the first slave
1738                 */
1739                memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
1740                ss.ss_family = slave_dev->type;
1741                res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss,
1742                                          extack);
1743                if (res) {
1744                        slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res);
1745                        goto err_restore_mtu;
1746                }
1747        }
1748
1749        /* set slave flag before open to prevent IPv6 addrconf */
1750        slave_dev->flags |= IFF_SLAVE;
1751
1752        /* open the slave since the application closed it */
1753        res = dev_open(slave_dev, extack);
1754        if (res) {
1755                slave_err(bond_dev, slave_dev, "Opening slave failed\n");
1756                goto err_restore_mac;
1757        }
1758
1759        slave_dev->priv_flags |= IFF_BONDING;
1760        /* initialize slave stats */
1761        dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1762
1763        if (bond_is_lb(bond)) {
1764                /* bond_alb_init_slave() must be called before all other stages since
1765                 * it might fail and we do not want to have to undo everything
1766                 */
1767                res = bond_alb_init_slave(bond, new_slave);
1768                if (res)
1769                        goto err_close;
1770        }
1771
1772        res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1773        if (res) {
1774                slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n");
1775                goto err_close;
1776        }
1777
1778        prev_slave = bond_last_slave(bond);
1779
1780        new_slave->delay = 0;
1781        new_slave->link_failure_count = 0;
1782
1783        if (bond_update_speed_duplex(new_slave) &&
1784            bond_needs_speed_duplex(bond))
1785                new_slave->link = BOND_LINK_DOWN;
1786
1787        new_slave->last_rx = jiffies -
1788                (msecs_to_jiffies(bond->params.arp_interval) + 1);
1789        for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1790                new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1791
1792        if (bond->params.miimon && !bond->params.use_carrier) {
1793                link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1794
1795                if ((link_reporting == -1) && !bond->params.arp_interval) {
1796                        /* miimon is set but a bonded network driver
1797                         * does not support ETHTOOL/MII and
1798                         * arp_interval is not set.  Note: if
1799                         * use_carrier is enabled, we will never go
1800                         * here (because netif_carrier is always
1801                         * supported); thus, we don't need to change
1802                         * the messages for netif_carrier.
1803                         */
1804                        slave_warn(bond_dev, slave_dev, "MII and ETHTOOL support not available for slave, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n");
1805                } else if (link_reporting == -1) {
1806                        /* unable get link status using mii/ethtool */
1807                        slave_warn(bond_dev, slave_dev, "can't get link status from slave; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface\n");
1808                }
1809        }
1810
1811        /* check for initial state */
1812        new_slave->link = BOND_LINK_NOCHANGE;
1813        if (bond->params.miimon) {
1814                if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1815                        if (bond->params.updelay) {
1816                                bond_set_slave_link_state(new_slave,
1817                                                          BOND_LINK_BACK,
1818                                                          BOND_SLAVE_NOTIFY_NOW);
1819                                new_slave->delay = bond->params.updelay;
1820                        } else {
1821                                bond_set_slave_link_state(new_slave,
1822                                                          BOND_LINK_UP,
1823                                                          BOND_SLAVE_NOTIFY_NOW);
1824                        }
1825                } else {
1826                        bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1827                                                  BOND_SLAVE_NOTIFY_NOW);
1828                }
1829        } else if (bond->params.arp_interval) {
1830                bond_set_slave_link_state(new_slave,
1831                                          (netif_carrier_ok(slave_dev) ?
1832                                          BOND_LINK_UP : BOND_LINK_DOWN),
1833                                          BOND_SLAVE_NOTIFY_NOW);
1834        } else {
1835                bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1836                                          BOND_SLAVE_NOTIFY_NOW);
1837        }
1838
1839        if (new_slave->link != BOND_LINK_DOWN)
1840                new_slave->last_link_up = jiffies;
1841        slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n",
1842                  new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1843                  (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1844
1845        if (bond_uses_primary(bond) && bond->params.primary[0]) {
1846                /* if there is a primary slave, remember it */
1847                if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1848                        rcu_assign_pointer(bond->primary_slave, new_slave);
1849                        bond->force_primary = true;
1850                }
1851        }
1852
1853        switch (BOND_MODE(bond)) {
1854        case BOND_MODE_ACTIVEBACKUP:
1855                bond_set_slave_inactive_flags(new_slave,
1856                                              BOND_SLAVE_NOTIFY_NOW);
1857                break;
1858        case BOND_MODE_8023AD:
1859                /* in 802.3ad mode, the internal mechanism
1860                 * will activate the slaves in the selected
1861                 * aggregator
1862                 */
1863                bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1864                /* if this is the first slave */
1865                if (!prev_slave) {
1866                        SLAVE_AD_INFO(new_slave)->id = 1;
1867                        /* Initialize AD with the number of times that the AD timer is called in 1 second
1868                         * can be called only after the mac address of the bond is set
1869                         */
1870                        bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1871                } else {
1872                        SLAVE_AD_INFO(new_slave)->id =
1873                                SLAVE_AD_INFO(prev_slave)->id + 1;
1874                }
1875
1876                bond_3ad_bind_slave(new_slave);
1877                break;
1878        case BOND_MODE_TLB:
1879        case BOND_MODE_ALB:
1880                bond_set_active_slave(new_slave);
1881                bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1882                break;
1883        default:
1884                slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n");
1885
1886                /* always active in trunk mode */
1887                bond_set_active_slave(new_slave);
1888
1889                /* In trunking mode there is little meaning to curr_active_slave
1890                 * anyway (it holds no special properties of the bond device),
1891                 * so we can change it without calling change_active_interface()
1892                 */
1893                if (!rcu_access_pointer(bond->curr_active_slave) &&
1894                    new_slave->link == BOND_LINK_UP)
1895                        rcu_assign_pointer(bond->curr_active_slave, new_slave);
1896
1897                break;
1898        } /* switch(bond_mode) */
1899
1900#ifdef CONFIG_NET_POLL_CONTROLLER
1901        if (bond->dev->npinfo) {
1902                if (slave_enable_netpoll(new_slave)) {
1903                        slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1904                        res = -EBUSY;
1905                        goto err_detach;
1906                }
1907        }
1908#endif
1909
1910        if (!(bond_dev->features & NETIF_F_LRO))
1911                dev_disable_lro(slave_dev);
1912
1913        res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1914                                         new_slave);
1915        if (res) {
1916                slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res);
1917                goto err_detach;
1918        }
1919
1920        res = bond_master_upper_dev_link(bond, new_slave, extack);
1921        if (res) {
1922                slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1923                goto err_unregister;
1924        }
1925
1926        res = bond_sysfs_slave_add(new_slave);
1927        if (res) {
1928                slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1929                goto err_upper_unlink;
1930        }
1931
1932        /* If the mode uses primary, then the following is handled by
1933         * bond_change_active_slave().
1934         */
1935        if (!bond_uses_primary(bond)) {
1936                /* set promiscuity level to new slave */
1937                if (bond_dev->flags & IFF_PROMISC) {
1938                        res = dev_set_promiscuity(slave_dev, 1);
1939                        if (res)
1940                                goto err_sysfs_del;
1941                }
1942
1943                /* set allmulti level to new slave */
1944                if (bond_dev->flags & IFF_ALLMULTI) {
1945                        res = dev_set_allmulti(slave_dev, 1);
1946                        if (res) {
1947                                if (bond_dev->flags & IFF_PROMISC)
1948                                        dev_set_promiscuity(slave_dev, -1);
1949                                goto err_sysfs_del;
1950                        }
1951                }
1952
1953                netif_addr_lock_bh(bond_dev);
1954                dev_mc_sync_multiple(slave_dev, bond_dev);
1955                dev_uc_sync_multiple(slave_dev, bond_dev);
1956                netif_addr_unlock_bh(bond_dev);
1957
1958                if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1959                        /* add lacpdu mc addr to mc list */
1960                        u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1961
1962                        dev_mc_add(slave_dev, lacpdu_multicast);
1963                }
1964        }
1965
1966        bond->slave_cnt++;
1967        bond_compute_features(bond);
1968        bond_set_carrier(bond);
1969
1970        if (bond_uses_primary(bond)) {
1971                block_netpoll_tx();
1972                bond_select_active_slave(bond);
1973                unblock_netpoll_tx();
1974        }
1975
1976        if (bond_mode_can_use_xmit_hash(bond))
1977                bond_update_slave_arr(bond, NULL);
1978
1979
1980        slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n",
1981                   bond_is_active_slave(new_slave) ? "an active" : "a backup",
1982                   new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1983
1984        /* enslave is successful */
1985        bond_queue_slave_event(new_slave);
1986        return 0;
1987
1988/* Undo stages on error */
1989err_sysfs_del:
1990        bond_sysfs_slave_del(new_slave);
1991
1992err_upper_unlink:
1993        bond_upper_dev_unlink(bond, new_slave);
1994
1995err_unregister:
1996        netdev_rx_handler_unregister(slave_dev);
1997
1998err_detach:
1999        vlan_vids_del_by_dev(slave_dev, bond_dev);
2000        if (rcu_access_pointer(bond->primary_slave) == new_slave)
2001                RCU_INIT_POINTER(bond->primary_slave, NULL);
2002        if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
2003                block_netpoll_tx();
2004                bond_change_active_slave(bond, NULL);
2005                bond_select_active_slave(bond);
2006                unblock_netpoll_tx();
2007        }
2008        /* either primary_slave or curr_active_slave might've changed */
2009        synchronize_rcu();
2010        slave_disable_netpoll(new_slave);
2011
2012err_close:
2013        if (!netif_is_bond_master(slave_dev))
2014                slave_dev->priv_flags &= ~IFF_BONDING;
2015        dev_close(slave_dev);
2016
2017err_restore_mac:
2018        slave_dev->flags &= ~IFF_SLAVE;
2019        if (!bond->params.fail_over_mac ||
2020            BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2021                /* XXX TODO - fom follow mode needs to change master's
2022                 * MAC if this slave's MAC is in use by the bond, or at
2023                 * least print a warning.
2024                 */
2025                bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
2026                                  new_slave->dev->addr_len);
2027                ss.ss_family = slave_dev->type;
2028                dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2029        }
2030
2031err_restore_mtu:
2032        dev_set_mtu(slave_dev, new_slave->original_mtu);
2033
2034err_free:
2035        kobject_put(&new_slave->kobj);
2036
2037err_undo_flags:
2038        /* Enslave of first slave has failed and we need to fix master's mac */
2039        if (!bond_has_slaves(bond)) {
2040                if (ether_addr_equal_64bits(bond_dev->dev_addr,
2041                                            slave_dev->dev_addr))
2042                        eth_hw_addr_random(bond_dev);
2043                if (bond_dev->type != ARPHRD_ETHER) {
2044                        dev_close(bond_dev);
2045                        ether_setup(bond_dev);
2046                        bond_dev->flags |= IFF_MASTER;
2047                        bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2048                }
2049        }
2050
2051        return res;
2052}
2053
2054/* Try to release the slave device <slave> from the bond device <master>
2055 * It is legal to access curr_active_slave without a lock because all the function
2056 * is RTNL-locked. If "all" is true it means that the function is being called
2057 * while destroying a bond interface and all slaves are being released.
2058 *
2059 * The rules for slave state should be:
2060 *   for Active/Backup:
2061 *     Active stays on all backups go down
2062 *   for Bonded connections:
2063 *     The first up interface should be left on and all others downed.
2064 */
2065static int __bond_release_one(struct net_device *bond_dev,
2066                              struct net_device *slave_dev,
2067                              bool all, bool unregister)
2068{
2069        struct bonding *bond = netdev_priv(bond_dev);
2070        struct slave *slave, *oldcurrent;
2071        struct sockaddr_storage ss;
2072        int old_flags = bond_dev->flags;
2073        netdev_features_t old_features = bond_dev->features;
2074
2075        /* slave is not a slave or master is not master of this slave */
2076        if (!(slave_dev->flags & IFF_SLAVE) ||
2077            !netdev_has_upper_dev(slave_dev, bond_dev)) {
2078                slave_dbg(bond_dev, slave_dev, "cannot release slave\n");
2079                return -EINVAL;
2080        }
2081
2082        block_netpoll_tx();
2083
2084        slave = bond_get_slave_by_dev(bond, slave_dev);
2085        if (!slave) {
2086                /* not a slave of this bond */
2087                slave_info(bond_dev, slave_dev, "interface not enslaved\n");
2088                unblock_netpoll_tx();
2089                return -EINVAL;
2090        }
2091
2092        bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
2093
2094        bond_sysfs_slave_del(slave);
2095
2096        /* recompute stats just before removing the slave */
2097        bond_get_stats(bond->dev, &bond->bond_stats);
2098
2099        bond_upper_dev_unlink(bond, slave);
2100        /* unregister rx_handler early so bond_handle_frame wouldn't be called
2101         * for this slave anymore.
2102         */
2103        netdev_rx_handler_unregister(slave_dev);
2104
2105        if (BOND_MODE(bond) == BOND_MODE_8023AD)
2106                bond_3ad_unbind_slave(slave);
2107
2108        if (bond_mode_can_use_xmit_hash(bond))
2109                bond_update_slave_arr(bond, slave);
2110
2111        slave_info(bond_dev, slave_dev, "Releasing %s interface\n",
2112                    bond_is_active_slave(slave) ? "active" : "backup");
2113
2114        oldcurrent = rcu_access_pointer(bond->curr_active_slave);
2115
2116        RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2117
2118        if (!all && (!bond->params.fail_over_mac ||
2119                     BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
2120                if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
2121                    bond_has_slaves(bond))
2122                        slave_warn(bond_dev, slave_dev, "the permanent HWaddr of slave - %pM - is still in use by bond - set the HWaddr of slave to a different address to avoid conflicts\n",
2123                                   slave->perm_hwaddr);
2124        }
2125
2126        if (rtnl_dereference(bond->primary_slave) == slave)
2127                RCU_INIT_POINTER(bond->primary_slave, NULL);
2128
2129        if (oldcurrent == slave)
2130                bond_change_active_slave(bond, NULL);
2131
2132        if (bond_is_lb(bond)) {
2133                /* Must be called only after the slave has been
2134                 * detached from the list and the curr_active_slave
2135                 * has been cleared (if our_slave == old_current),
2136                 * but before a new active slave is selected.
2137                 */
2138                bond_alb_deinit_slave(bond, slave);
2139        }
2140
2141        if (all) {
2142                RCU_INIT_POINTER(bond->curr_active_slave, NULL);
2143        } else if (oldcurrent == slave) {
2144                /* Note that we hold RTNL over this sequence, so there
2145                 * is no concern that another slave add/remove event
2146                 * will interfere.
2147                 */
2148                bond_select_active_slave(bond);
2149        }
2150
2151        if (!bond_has_slaves(bond)) {
2152                bond_set_carrier(bond);
2153                eth_hw_addr_random(bond_dev);
2154        }
2155
2156        unblock_netpoll_tx();
2157        synchronize_rcu();
2158        bond->slave_cnt--;
2159
2160        if (!bond_has_slaves(bond)) {
2161                call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2162                call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
2163        }
2164
2165        bond_compute_features(bond);
2166        if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2167            (old_features & NETIF_F_VLAN_CHALLENGED))
2168                slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n");
2169
2170        vlan_vids_del_by_dev(slave_dev, bond_dev);
2171
2172        /* If the mode uses primary, then this case was handled above by
2173         * bond_change_active_slave(..., NULL)
2174         */
2175        if (!bond_uses_primary(bond)) {
2176                /* unset promiscuity level from slave
2177                 * NOTE: The NETDEV_CHANGEADDR call above may change the value
2178                 * of the IFF_PROMISC flag in the bond_dev, but we need the
2179                 * value of that flag before that change, as that was the value
2180                 * when this slave was attached, so we cache at the start of the
2181                 * function and use it here. Same goes for ALLMULTI below
2182                 */
2183                if (old_flags & IFF_PROMISC)
2184                        dev_set_promiscuity(slave_dev, -1);
2185
2186                /* unset allmulti level from slave */
2187                if (old_flags & IFF_ALLMULTI)
2188                        dev_set_allmulti(slave_dev, -1);
2189
2190                bond_hw_addr_flush(bond_dev, slave_dev);
2191        }
2192
2193        slave_disable_netpoll(slave);
2194
2195        /* close slave before restoring its mac address */
2196        dev_close(slave_dev);
2197
2198        if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
2199            BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2200                /* restore original ("permanent") mac address */
2201                bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
2202                                  slave->dev->addr_len);
2203                ss.ss_family = slave_dev->type;
2204                dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2205        }
2206
2207        if (unregister)
2208                __dev_set_mtu(slave_dev, slave->original_mtu);
2209        else
2210                dev_set_mtu(slave_dev, slave->original_mtu);
2211
2212        if (!netif_is_bond_master(slave_dev))
2213                slave_dev->priv_flags &= ~IFF_BONDING;
2214
2215        kobject_put(&slave->kobj);
2216
2217        return 0;
2218}
2219
2220/* A wrapper used because of ndo_del_link */
2221int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2222{
2223        return __bond_release_one(bond_dev, slave_dev, false, false);
2224}
2225
2226/* First release a slave and then destroy the bond if no more slaves are left.
2227 * Must be under rtnl_lock when this function is called.
2228 */
2229static int bond_release_and_destroy(struct net_device *bond_dev,
2230                                    struct net_device *slave_dev)
2231{
2232        struct bonding *bond = netdev_priv(bond_dev);
2233        int ret;
2234
2235        ret = __bond_release_one(bond_dev, slave_dev, false, true);
2236        if (ret == 0 && !bond_has_slaves(bond) &&
2237            bond_dev->reg_state != NETREG_UNREGISTERING) {
2238                bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2239                netdev_info(bond_dev, "Destroying bond\n");
2240                bond_remove_proc_entry(bond);
2241                unregister_netdevice(bond_dev);
2242        }
2243        return ret;
2244}
2245
2246static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2247{
2248        struct bonding *bond = netdev_priv(bond_dev);
2249        bond_fill_ifbond(bond, info);
2250}
2251
2252static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2253{
2254        struct bonding *bond = netdev_priv(bond_dev);
2255        struct list_head *iter;
2256        int i = 0, res = -ENODEV;
2257        struct slave *slave;
2258
2259        bond_for_each_slave(bond, slave, iter) {
2260                if (i++ == (int)info->slave_id) {
2261                        res = 0;
2262                        bond_fill_ifslave(slave, info);
2263                        break;
2264                }
2265        }
2266
2267        return res;
2268}
2269
2270/*-------------------------------- Monitoring -------------------------------*/
2271
2272/* called with rcu_read_lock() */
2273static int bond_miimon_inspect(struct bonding *bond)
2274{
2275        int link_state, commit = 0;
2276        struct list_head *iter;
2277        struct slave *slave;
2278        bool ignore_updelay;
2279
2280        ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2281
2282        bond_for_each_slave_rcu(bond, slave, iter) {
2283                bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2284
2285                link_state = bond_check_dev_link(bond, slave->dev, 0);
2286
2287                switch (slave->link) {
2288                case BOND_LINK_UP:
2289                        if (link_state)
2290                                continue;
2291
2292                        bond_propose_link_state(slave, BOND_LINK_FAIL);
2293                        commit++;
2294                        slave->delay = bond->params.downdelay;
2295                        if (slave->delay) {
2296                                slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n",
2297                                           (BOND_MODE(bond) ==
2298                                            BOND_MODE_ACTIVEBACKUP) ?
2299                                            (bond_is_active_slave(slave) ?
2300                                             "active " : "backup ") : "",
2301                                           bond->params.downdelay * bond->params.miimon);
2302                        }
2303                        fallthrough;
2304                case BOND_LINK_FAIL:
2305                        if (link_state) {
2306                                /* recovered before downdelay expired */
2307                                bond_propose_link_state(slave, BOND_LINK_UP);
2308                                slave->last_link_up = jiffies;
2309                                slave_info(bond->dev, slave->dev, "link status up again after %d ms\n",
2310                                           (bond->params.downdelay - slave->delay) *
2311                                           bond->params.miimon);
2312                                commit++;
2313                                continue;
2314                        }
2315
2316                        if (slave->delay <= 0) {
2317                                bond_propose_link_state(slave, BOND_LINK_DOWN);
2318                                commit++;
2319                                continue;
2320                        }
2321
2322                        slave->delay--;
2323                        break;
2324
2325                case BOND_LINK_DOWN:
2326                        if (!link_state)
2327                                continue;
2328
2329                        bond_propose_link_state(slave, BOND_LINK_BACK);
2330                        commit++;
2331                        slave->delay = bond->params.updelay;
2332
2333                        if (slave->delay) {
2334                                slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n",
2335                                           ignore_updelay ? 0 :
2336                                           bond->params.updelay *
2337                                           bond->params.miimon);
2338                        }
2339                        fallthrough;
2340                case BOND_LINK_BACK:
2341                        if (!link_state) {
2342                                bond_propose_link_state(slave, BOND_LINK_DOWN);
2343                                slave_info(bond->dev, slave->dev, "link status down again after %d ms\n",
2344                                           (bond->params.updelay - slave->delay) *
2345                                           bond->params.miimon);
2346                                commit++;
2347                                continue;
2348                        }
2349
2350                        if (ignore_updelay)
2351                                slave->delay = 0;
2352
2353                        if (slave->delay <= 0) {
2354                                bond_propose_link_state(slave, BOND_LINK_UP);
2355                                commit++;
2356                                ignore_updelay = false;
2357                                continue;
2358                        }
2359
2360                        slave->delay--;
2361                        break;
2362                }
2363        }
2364
2365        return commit;
2366}
2367
2368static void bond_miimon_link_change(struct bonding *bond,
2369                                    struct slave *slave,
2370                                    char link)
2371{
2372        switch (BOND_MODE(bond)) {
2373        case BOND_MODE_8023AD:
2374                bond_3ad_handle_link_change(slave, link);
2375                break;
2376        case BOND_MODE_TLB:
2377        case BOND_MODE_ALB:
2378                bond_alb_handle_link_change(bond, slave, link);
2379                break;
2380        case BOND_MODE_XOR:
2381                bond_update_slave_arr(bond, NULL);
2382                break;
2383        }
2384}
2385
2386static void bond_miimon_commit(struct bonding *bond)
2387{
2388        struct list_head *iter;
2389        struct slave *slave, *primary;
2390
2391        bond_for_each_slave(bond, slave, iter) {
2392                switch (slave->link_new_state) {
2393                case BOND_LINK_NOCHANGE:
2394                        /* For 802.3ad mode, check current slave speed and
2395                         * duplex again in case its port was disabled after
2396                         * invalid speed/duplex reporting but recovered before
2397                         * link monitoring could make a decision on the actual
2398                         * link status
2399                         */
2400                        if (BOND_MODE(bond) == BOND_MODE_8023AD &&
2401                            slave->link == BOND_LINK_UP)
2402                                bond_3ad_adapter_speed_duplex_changed(slave);
2403                        continue;
2404
2405                case BOND_LINK_UP:
2406                        if (bond_update_speed_duplex(slave) &&
2407                            bond_needs_speed_duplex(bond)) {
2408                                slave->link = BOND_LINK_DOWN;
2409                                if (net_ratelimit())
2410                                        slave_warn(bond->dev, slave->dev,
2411                                                   "failed to get link speed/duplex\n");
2412                                continue;
2413                        }
2414                        bond_set_slave_link_state(slave, BOND_LINK_UP,
2415                                                  BOND_SLAVE_NOTIFY_NOW);
2416                        slave->last_link_up = jiffies;
2417
2418                        primary = rtnl_dereference(bond->primary_slave);
2419                        if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2420                                /* prevent it from being the active one */
2421                                bond_set_backup_slave(slave);
2422                        } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2423                                /* make it immediately active */
2424                                bond_set_active_slave(slave);
2425                        }
2426
2427                        slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n",
2428                                   slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2429                                   slave->duplex ? "full" : "half");
2430
2431                        bond_miimon_link_change(bond, slave, BOND_LINK_UP);
2432
2433                        if (!bond->curr_active_slave || slave == primary)
2434                                goto do_failover;
2435
2436                        continue;
2437
2438                case BOND_LINK_DOWN:
2439                        if (slave->link_failure_count < UINT_MAX)
2440                                slave->link_failure_count++;
2441
2442                        bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2443                                                  BOND_SLAVE_NOTIFY_NOW);
2444
2445                        if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2446                            BOND_MODE(bond) == BOND_MODE_8023AD)
2447                                bond_set_slave_inactive_flags(slave,
2448                                                              BOND_SLAVE_NOTIFY_NOW);
2449
2450                        slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
2451
2452                        bond_miimon_link_change(bond, slave, BOND_LINK_DOWN);
2453
2454                        if (slave == rcu_access_pointer(bond->curr_active_slave))
2455                                goto do_failover;
2456
2457                        continue;
2458
2459                default:
2460                        slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n",
2461                                  slave->link_new_state);
2462                        bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2463
2464                        continue;
2465                }
2466
2467do_failover:
2468                block_netpoll_tx();
2469                bond_select_active_slave(bond);
2470                unblock_netpoll_tx();
2471        }
2472
2473        bond_set_carrier(bond);
2474}
2475
2476/* bond_mii_monitor
2477 *
2478 * Really a wrapper that splits the mii monitor into two phases: an
2479 * inspection, then (if inspection indicates something needs to be done)
2480 * an acquisition of appropriate locks followed by a commit phase to
2481 * implement whatever link state changes are indicated.
2482 */
2483static void bond_mii_monitor(struct work_struct *work)
2484{
2485        struct bonding *bond = container_of(work, struct bonding,
2486                                            mii_work.work);
2487        bool should_notify_peers = false;
2488        bool commit;
2489        unsigned long delay;
2490        struct slave *slave;
2491        struct list_head *iter;
2492
2493        delay = msecs_to_jiffies(bond->params.miimon);
2494
2495        if (!bond_has_slaves(bond))
2496                goto re_arm;
2497
2498        rcu_read_lock();
2499        should_notify_peers = bond_should_notify_peers(bond);
2500        commit = !!bond_miimon_inspect(bond);
2501        if (bond->send_peer_notif) {
2502                rcu_read_unlock();
2503                if (rtnl_trylock()) {
2504                        bond->send_peer_notif--;
2505                        rtnl_unlock();
2506                }
2507        } else {
2508                rcu_read_unlock();
2509        }
2510
2511        if (commit) {
2512                /* Race avoidance with bond_close cancel of workqueue */
2513                if (!rtnl_trylock()) {
2514                        delay = 1;
2515                        should_notify_peers = false;
2516                        goto re_arm;
2517                }
2518
2519                bond_for_each_slave(bond, slave, iter) {
2520                        bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
2521                }
2522                bond_miimon_commit(bond);
2523
2524                rtnl_unlock();  /* might sleep, hold no other locks */
2525        }
2526
2527re_arm:
2528        if (bond->params.miimon)
2529                queue_delayed_work(bond->wq, &bond->mii_work, delay);
2530
2531        if (should_notify_peers) {
2532                if (!rtnl_trylock())
2533                        return;
2534                call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2535                rtnl_unlock();
2536        }
2537}
2538
2539static int bond_upper_dev_walk(struct net_device *upper,
2540                               struct netdev_nested_priv *priv)
2541{
2542        __be32 ip = *(__be32 *)priv->data;
2543
2544        return ip == bond_confirm_addr(upper, 0, ip);
2545}
2546
2547static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2548{
2549        struct netdev_nested_priv priv = {
2550                .data = (void *)&ip,
2551        };
2552        bool ret = false;
2553
2554        if (ip == bond_confirm_addr(bond->dev, 0, ip))
2555                return true;
2556
2557        rcu_read_lock();
2558        if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &priv))
2559                ret = true;
2560        rcu_read_unlock();
2561
2562        return ret;
2563}
2564
2565/* We go to the (large) trouble of VLAN tagging ARP frames because
2566 * switches in VLAN mode (especially if ports are configured as
2567 * "native" to a VLAN) might not pass non-tagged frames.
2568 */
2569static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip,
2570                          __be32 src_ip, struct bond_vlan_tag *tags)
2571{
2572        struct sk_buff *skb;
2573        struct bond_vlan_tag *outer_tag = tags;
2574        struct net_device *slave_dev = slave->dev;
2575        struct net_device *bond_dev = slave->bond->dev;
2576
2577        slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n",
2578                  arp_op, &dest_ip, &src_ip);
2579
2580        skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2581                         NULL, slave_dev->dev_addr, NULL);
2582
2583        if (!skb) {
2584                net_err_ratelimited("ARP packet allocation failed\n");
2585                return;
2586        }
2587
2588        if (!tags || tags->vlan_proto == VLAN_N_VID)
2589                goto xmit;
2590
2591        tags++;
2592
2593        /* Go through all the tags backwards and add them to the packet */
2594        while (tags->vlan_proto != VLAN_N_VID) {
2595                if (!tags->vlan_id) {
2596                        tags++;
2597                        continue;
2598                }
2599
2600                slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n",
2601                          ntohs(outer_tag->vlan_proto), tags->vlan_id);
2602                skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2603                                                tags->vlan_id);
2604                if (!skb) {
2605                        net_err_ratelimited("failed to insert inner VLAN tag\n");
2606                        return;
2607                }
2608
2609                tags++;
2610        }
2611        /* Set the outer tag */
2612        if (outer_tag->vlan_id) {
2613                slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n",
2614                          ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2615                __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2616                                       outer_tag->vlan_id);
2617        }
2618
2619xmit:
2620        arp_xmit(skb);
2621}
2622
2623/* Validate the device path between the @start_dev and the @end_dev.
2624 * The path is valid if the @end_dev is reachable through device
2625 * stacking.
2626 * When the path is validated, collect any vlan information in the
2627 * path.
2628 */
2629struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2630                                              struct net_device *end_dev,
2631                                              int level)
2632{
2633        struct bond_vlan_tag *tags;
2634        struct net_device *upper;
2635        struct list_head  *iter;
2636
2637        if (start_dev == end_dev) {
2638                tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC);
2639                if (!tags)
2640                        return ERR_PTR(-ENOMEM);
2641                tags[level].vlan_proto = VLAN_N_VID;
2642                return tags;
2643        }
2644
2645        netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2646                tags = bond_verify_device_path(upper, end_dev, level + 1);
2647                if (IS_ERR_OR_NULL(tags)) {
2648                        if (IS_ERR(tags))
2649                                return tags;
2650                        continue;
2651                }
2652                if (is_vlan_dev(upper)) {
2653                        tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2654                        tags[level].vlan_id = vlan_dev_vlan_id(upper);
2655                }
2656
2657                return tags;
2658        }
2659
2660        return NULL;
2661}
2662
2663static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2664{
2665        struct rtable *rt;
2666        struct bond_vlan_tag *tags;
2667        __be32 *targets = bond->params.arp_targets, addr;
2668        int i;
2669
2670        for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2671                slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n",
2672                          __func__, &targets[i]);
2673                tags = NULL;
2674
2675                /* Find out through which dev should the packet go */
2676                rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2677                                     RTO_ONLINK, 0);
2678                if (IS_ERR(rt)) {
2679                        /* there's no route to target - try to send arp
2680                         * probe to generate any traffic (arp_validate=0)
2681                         */
2682                        if (bond->params.arp_validate)
2683                                net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2684                                                     bond->dev->name,
2685                                                     &targets[i]);
2686                        bond_arp_send(slave, ARPOP_REQUEST, targets[i],
2687                                      0, tags);
2688                        continue;
2689                }
2690
2691                /* bond device itself */
2692                if (rt->dst.dev == bond->dev)
2693                        goto found;
2694
2695                rcu_read_lock();
2696                tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2697                rcu_read_unlock();
2698
2699                if (!IS_ERR_OR_NULL(tags))
2700                        goto found;
2701
2702                /* Not our device - skip */
2703                slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2704                           &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2705
2706                ip_rt_put(rt);
2707                continue;
2708
2709found:
2710                addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2711                ip_rt_put(rt);
2712                bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags);
2713                kfree(tags);
2714        }
2715}
2716
2717static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2718{
2719        int i;
2720
2721        if (!sip || !bond_has_this_ip(bond, tip)) {
2722                slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n",
2723                           __func__, &sip, &tip);
2724                return;
2725        }
2726
2727        i = bond_get_targets_ip(bond->params.arp_targets, sip);
2728        if (i == -1) {
2729                slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n",
2730                           __func__, &sip);
2731                return;
2732        }
2733        slave->last_rx = jiffies;
2734        slave->target_last_arp_rx[i] = jiffies;
2735}
2736
2737int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2738                 struct slave *slave)
2739{
2740        struct arphdr *arp = (struct arphdr *)skb->data;
2741        struct slave *curr_active_slave, *curr_arp_slave;
2742        unsigned char *arp_ptr;
2743        __be32 sip, tip;
2744        int is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2745        unsigned int alen;
2746
2747        if (!slave_do_arp_validate(bond, slave)) {
2748                if ((slave_do_arp_validate_only(bond) && is_arp) ||
2749                    !slave_do_arp_validate_only(bond))
2750                        slave->last_rx = jiffies;
2751                return RX_HANDLER_ANOTHER;
2752        } else if (!is_arp) {
2753                return RX_HANDLER_ANOTHER;
2754        }
2755
2756        alen = arp_hdr_len(bond->dev);
2757
2758        slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n",
2759                   __func__, skb->dev->name);
2760
2761        if (alen > skb_headlen(skb)) {
2762                arp = kmalloc(alen, GFP_ATOMIC);
2763                if (!arp)
2764                        goto out_unlock;
2765                if (skb_copy_bits(skb, 0, arp, alen) < 0)
2766                        goto out_unlock;
2767        }
2768
2769        if (arp->ar_hln != bond->dev->addr_len ||
2770            skb->pkt_type == PACKET_OTHERHOST ||
2771            skb->pkt_type == PACKET_LOOPBACK ||
2772            arp->ar_hrd != htons(ARPHRD_ETHER) ||
2773            arp->ar_pro != htons(ETH_P_IP) ||
2774            arp->ar_pln != 4)
2775                goto out_unlock;
2776
2777        arp_ptr = (unsigned char *)(arp + 1);
2778        arp_ptr += bond->dev->addr_len;
2779        memcpy(&sip, arp_ptr, 4);
2780        arp_ptr += 4 + bond->dev->addr_len;
2781        memcpy(&tip, arp_ptr, 4);
2782
2783        slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2784                  __func__, slave->dev->name, bond_slave_state(slave),
2785                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2786                  &sip, &tip);
2787
2788        curr_active_slave = rcu_dereference(bond->curr_active_slave);
2789        curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2790
2791        /* We 'trust' the received ARP enough to validate it if:
2792         *
2793         * (a) the slave receiving the ARP is active (which includes the
2794         * current ARP slave, if any), or
2795         *
2796         * (b) the receiving slave isn't active, but there is a currently
2797         * active slave and it received valid arp reply(s) after it became
2798         * the currently active slave, or
2799         *
2800         * (c) there is an ARP slave that sent an ARP during the prior ARP
2801         * interval, and we receive an ARP reply on any slave.  We accept
2802         * these because switch FDB update delays may deliver the ARP
2803         * reply to a slave other than the sender of the ARP request.
2804         *
2805         * Note: for (b), backup slaves are receiving the broadcast ARP
2806         * request, not a reply.  This request passes from the sending
2807         * slave through the L2 switch(es) to the receiving slave.  Since
2808         * this is checking the request, sip/tip are swapped for
2809         * validation.
2810         *
2811         * This is done to avoid endless looping when we can't reach the
2812         * arp_ip_target and fool ourselves with our own arp requests.
2813         */
2814        if (bond_is_active_slave(slave))
2815                bond_validate_arp(bond, slave, sip, tip);
2816        else if (curr_active_slave &&
2817                 time_after(slave_last_rx(bond, curr_active_slave),
2818                            curr_active_slave->last_link_up))
2819                bond_validate_arp(bond, slave, tip, sip);
2820        else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2821                 bond_time_in_interval(bond,
2822                                       dev_trans_start(curr_arp_slave->dev), 1))
2823                bond_validate_arp(bond, slave, sip, tip);
2824
2825out_unlock:
2826        if (arp != (struct arphdr *)skb->data)
2827                kfree(arp);
2828        return RX_HANDLER_ANOTHER;
2829}
2830
2831/* function to verify if we're in the arp_interval timeslice, returns true if
2832 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2833 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2834 */
2835static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2836                                  int mod)
2837{
2838        int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2839
2840        return time_in_range(jiffies,
2841                             last_act - delta_in_ticks,
2842                             last_act + mod * delta_in_ticks + delta_in_ticks/2);
2843}
2844
2845/* This function is called regularly to monitor each slave's link
2846 * ensuring that traffic is being sent and received when arp monitoring
2847 * is used in load-balancing mode. if the adapter has been dormant, then an
2848 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2849 * arp monitoring in active backup mode.
2850 */
2851static void bond_loadbalance_arp_mon(struct bonding *bond)
2852{
2853        struct slave *slave, *oldcurrent;
2854        struct list_head *iter;
2855        int do_failover = 0, slave_state_changed = 0;
2856
2857        if (!bond_has_slaves(bond))
2858                goto re_arm;
2859
2860        rcu_read_lock();
2861
2862        oldcurrent = rcu_dereference(bond->curr_active_slave);
2863        /* see if any of the previous devices are up now (i.e. they have
2864         * xmt and rcv traffic). the curr_active_slave does not come into
2865         * the picture unless it is null. also, slave->last_link_up is not
2866         * needed here because we send an arp on each slave and give a slave
2867         * as long as it needs to get the tx/rx within the delta.
2868         * TODO: what about up/down delay in arp mode? it wasn't here before
2869         *       so it can wait
2870         */
2871        bond_for_each_slave_rcu(bond, slave, iter) {
2872                unsigned long trans_start = dev_trans_start(slave->dev);
2873
2874                bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2875
2876                if (slave->link != BOND_LINK_UP) {
2877                        if (bond_time_in_interval(bond, trans_start, 1) &&
2878                            bond_time_in_interval(bond, slave->last_rx, 1)) {
2879
2880                                bond_propose_link_state(slave, BOND_LINK_UP);
2881                                slave_state_changed = 1;
2882
2883                                /* primary_slave has no meaning in round-robin
2884                                 * mode. the window of a slave being up and
2885                                 * curr_active_slave being null after enslaving
2886                                 * is closed.
2887                                 */
2888                                if (!oldcurrent) {
2889                                        slave_info(bond->dev, slave->dev, "link status definitely up\n");
2890                                        do_failover = 1;
2891                                } else {
2892                                        slave_info(bond->dev, slave->dev, "interface is now up\n");
2893                                }
2894                        }
2895                } else {
2896                        /* slave->link == BOND_LINK_UP */
2897
2898                        /* not all switches will respond to an arp request
2899                         * when the source ip is 0, so don't take the link down
2900                         * if we don't know our ip yet
2901                         */
2902                        if (!bond_time_in_interval(bond, trans_start, 2) ||
2903                            !bond_time_in_interval(bond, slave->last_rx, 2)) {
2904
2905                                bond_propose_link_state(slave, BOND_LINK_DOWN);
2906                                slave_state_changed = 1;
2907
2908                                if (slave->link_failure_count < UINT_MAX)
2909                                        slave->link_failure_count++;
2910
2911                                slave_info(bond->dev, slave->dev, "interface is now down\n");
2912
2913                                if (slave == oldcurrent)
2914                                        do_failover = 1;
2915                        }
2916                }
2917
2918                /* note: if switch is in round-robin mode, all links
2919                 * must tx arp to ensure all links rx an arp - otherwise
2920                 * links may oscillate or not come up at all; if switch is
2921                 * in something like xor mode, there is nothing we can
2922                 * do - all replies will be rx'ed on same link causing slaves
2923                 * to be unstable during low/no traffic periods
2924                 */
2925                if (bond_slave_is_up(slave))
2926                        bond_arp_send_all(bond, slave);
2927        }
2928
2929        rcu_read_unlock();
2930
2931        if (do_failover || slave_state_changed) {
2932                if (!rtnl_trylock())
2933                        goto re_arm;
2934
2935                bond_for_each_slave(bond, slave, iter) {
2936                        if (slave->link_new_state != BOND_LINK_NOCHANGE)
2937                                slave->link = slave->link_new_state;
2938                }
2939
2940                if (slave_state_changed) {
2941                        bond_slave_state_change(bond);
2942                        if (BOND_MODE(bond) == BOND_MODE_XOR)
2943                                bond_update_slave_arr(bond, NULL);
2944                }
2945                if (do_failover) {
2946                        block_netpoll_tx();
2947                        bond_select_active_slave(bond);
2948                        unblock_netpoll_tx();
2949                }
2950                rtnl_unlock();
2951        }
2952
2953re_arm:
2954        if (bond->params.arp_interval)
2955                queue_delayed_work(bond->wq, &bond->arp_work,
2956                                   msecs_to_jiffies(bond->params.arp_interval));
2957}
2958
2959/* Called to inspect slaves for active-backup mode ARP monitor link state
2960 * changes.  Sets proposed link state in slaves to specify what action
2961 * should take place for the slave.  Returns 0 if no changes are found, >0
2962 * if changes to link states must be committed.
2963 *
2964 * Called with rcu_read_lock held.
2965 */
2966static int bond_ab_arp_inspect(struct bonding *bond)
2967{
2968        unsigned long trans_start, last_rx;
2969        struct list_head *iter;
2970        struct slave *slave;
2971        int commit = 0;
2972
2973        bond_for_each_slave_rcu(bond, slave, iter) {
2974                bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2975                last_rx = slave_last_rx(bond, slave);
2976
2977                if (slave->link != BOND_LINK_UP) {
2978                        if (bond_time_in_interval(bond, last_rx, 1)) {
2979                                bond_propose_link_state(slave, BOND_LINK_UP);
2980                                commit++;
2981                        } else if (slave->link == BOND_LINK_BACK) {
2982                                bond_propose_link_state(slave, BOND_LINK_FAIL);
2983                                commit++;
2984                        }
2985                        continue;
2986                }
2987
2988                /* Give slaves 2*delta after being enslaved or made
2989                 * active.  This avoids bouncing, as the last receive
2990                 * times need a full ARP monitor cycle to be updated.
2991                 */
2992                if (bond_time_in_interval(bond, slave->last_link_up, 2))
2993                        continue;
2994
2995                /* Backup slave is down if:
2996                 * - No current_arp_slave AND
2997                 * - more than 3*delta since last receive AND
2998                 * - the bond has an IP address
2999                 *
3000                 * Note: a non-null current_arp_slave indicates
3001                 * the curr_active_slave went down and we are
3002                 * searching for a new one; under this condition
3003                 * we only take the curr_active_slave down - this
3004                 * gives each slave a chance to tx/rx traffic
3005                 * before being taken out
3006                 */
3007                if (!bond_is_active_slave(slave) &&
3008                    !rcu_access_pointer(bond->current_arp_slave) &&
3009                    !bond_time_in_interval(bond, last_rx, 3)) {
3010                        bond_propose_link_state(slave, BOND_LINK_DOWN);
3011                        commit++;
3012                }
3013
3014                /* Active slave is down if:
3015                 * - more than 2*delta since transmitting OR
3016                 * - (more than 2*delta since receive AND
3017                 *    the bond has an IP address)
3018                 */
3019                trans_start = dev_trans_start(slave->dev);
3020                if (bond_is_active_slave(slave) &&
3021                    (!bond_time_in_interval(bond, trans_start, 2) ||
3022                     !bond_time_in_interval(bond, last_rx, 2))) {
3023                        bond_propose_link_state(slave, BOND_LINK_DOWN);
3024                        commit++;
3025                }
3026        }
3027
3028        return commit;
3029}
3030
3031/* Called to commit link state changes noted by inspection step of
3032 * active-backup mode ARP monitor.
3033 *
3034 * Called with RTNL hold.
3035 */
3036static void bond_ab_arp_commit(struct bonding *bond)
3037{
3038        unsigned long trans_start;
3039        struct list_head *iter;
3040        struct slave *slave;
3041
3042        bond_for_each_slave(bond, slave, iter) {
3043                switch (slave->link_new_state) {
3044                case BOND_LINK_NOCHANGE:
3045                        continue;
3046
3047                case BOND_LINK_UP:
3048                        trans_start = dev_trans_start(slave->dev);
3049                        if (rtnl_dereference(bond->curr_active_slave) != slave ||
3050                            (!rtnl_dereference(bond->curr_active_slave) &&
3051                             bond_time_in_interval(bond, trans_start, 1))) {
3052                                struct slave *current_arp_slave;
3053
3054                                current_arp_slave = rtnl_dereference(bond->current_arp_slave);
3055                                bond_set_slave_link_state(slave, BOND_LINK_UP,
3056                                                          BOND_SLAVE_NOTIFY_NOW);
3057                                if (current_arp_slave) {
3058                                        bond_set_slave_inactive_flags(
3059                                                current_arp_slave,
3060                                                BOND_SLAVE_NOTIFY_NOW);
3061                                        RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3062                                }
3063
3064                                slave_info(bond->dev, slave->dev, "link status definitely up\n");
3065
3066                                if (!rtnl_dereference(bond->curr_active_slave) ||
3067                                    slave == rtnl_dereference(bond->primary_slave))
3068                                        goto do_failover;
3069
3070                        }
3071
3072                        continue;
3073
3074                case BOND_LINK_DOWN:
3075                        if (slave->link_failure_count < UINT_MAX)
3076                                slave->link_failure_count++;
3077
3078                        bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3079                                                  BOND_SLAVE_NOTIFY_NOW);
3080                        bond_set_slave_inactive_flags(slave,
3081                                                      BOND_SLAVE_NOTIFY_NOW);
3082
3083                        slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
3084
3085                        if (slave == rtnl_dereference(bond->curr_active_slave)) {
3086                                RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3087                                goto do_failover;
3088                        }
3089
3090                        continue;
3091
3092                case BOND_LINK_FAIL:
3093                        bond_set_slave_link_state(slave, BOND_LINK_FAIL,
3094                                                  BOND_SLAVE_NOTIFY_NOW);
3095                        bond_set_slave_inactive_flags(slave,
3096                                                      BOND_SLAVE_NOTIFY_NOW);
3097
3098                        /* A slave has just been enslaved and has become
3099                         * the current active slave.
3100                         */
3101                        if (rtnl_dereference(bond->curr_active_slave))
3102                                RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3103                        continue;
3104
3105                default:
3106                        slave_err(bond->dev, slave->dev,
3107                                  "impossible: link_new_state %d on slave\n",
3108                                  slave->link_new_state);
3109                        continue;
3110                }
3111
3112do_failover:
3113                block_netpoll_tx();
3114                bond_select_active_slave(bond);
3115                unblock_netpoll_tx();
3116        }
3117
3118        bond_set_carrier(bond);
3119}
3120
3121/* Send ARP probes for active-backup mode ARP monitor.
3122 *
3123 * Called with rcu_read_lock held.
3124 */
3125static bool bond_ab_arp_probe(struct bonding *bond)
3126{
3127        struct slave *slave, *before = NULL, *new_slave = NULL,
3128                     *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
3129                     *curr_active_slave = rcu_dereference(bond->curr_active_slave);
3130        struct list_head *iter;
3131        bool found = false;
3132        bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
3133
3134        if (curr_arp_slave && curr_active_slave)
3135                netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
3136                            curr_arp_slave->dev->name,
3137                            curr_active_slave->dev->name);
3138
3139        if (curr_active_slave) {
3140                bond_arp_send_all(bond, curr_active_slave);
3141                return should_notify_rtnl;
3142        }
3143
3144        /* if we don't have a curr_active_slave, search for the next available
3145         * backup slave from the current_arp_slave and make it the candidate
3146         * for becoming the curr_active_slave
3147         */
3148
3149        if (!curr_arp_slave) {
3150                curr_arp_slave = bond_first_slave_rcu(bond);
3151                if (!curr_arp_slave)
3152                        return should_notify_rtnl;
3153        }
3154
3155        bond_for_each_slave_rcu(bond, slave, iter) {
3156                if (!found && !before && bond_slave_is_up(slave))
3157                        before = slave;
3158
3159                if (found && !new_slave && bond_slave_is_up(slave))
3160                        new_slave = slave;
3161                /* if the link state is up at this point, we
3162                 * mark it down - this can happen if we have
3163                 * simultaneous link failures and
3164                 * reselect_active_interface doesn't make this
3165                 * one the current slave so it is still marked
3166                 * up when it is actually down
3167                 */
3168                if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3169                        bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3170                                                  BOND_SLAVE_NOTIFY_LATER);
3171                        if (slave->link_failure_count < UINT_MAX)
3172                                slave->link_failure_count++;
3173
3174                        bond_set_slave_inactive_flags(slave,
3175                                                      BOND_SLAVE_NOTIFY_LATER);
3176
3177                        slave_info(bond->dev, slave->dev, "backup interface is now down\n");
3178                }
3179                if (slave == curr_arp_slave)
3180                        found = true;
3181        }
3182
3183        if (!new_slave && before)
3184                new_slave = before;
3185
3186        if (!new_slave)
3187                goto check_state;
3188
3189        bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
3190                                  BOND_SLAVE_NOTIFY_LATER);
3191        bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
3192        bond_arp_send_all(bond, new_slave);
3193        new_slave->last_link_up = jiffies;
3194        rcu_assign_pointer(bond->current_arp_slave, new_slave);
3195
3196check_state:
3197        bond_for_each_slave_rcu(bond, slave, iter) {
3198                if (slave->should_notify || slave->should_notify_link) {
3199                        should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
3200                        break;
3201                }
3202        }
3203        return should_notify_rtnl;
3204}
3205
3206static void bond_activebackup_arp_mon(struct bonding *bond)
3207{
3208        bool should_notify_peers = false;
3209        bool should_notify_rtnl = false;
3210        int delta_in_ticks;
3211
3212        delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3213
3214        if (!bond_has_slaves(bond))
3215                goto re_arm;
3216
3217        rcu_read_lock();
3218
3219        should_notify_peers = bond_should_notify_peers(bond);
3220
3221        if (bond_ab_arp_inspect(bond)) {
3222                rcu_read_unlock();
3223
3224                /* Race avoidance with bond_close flush of workqueue */
3225                if (!rtnl_trylock()) {
3226                        delta_in_ticks = 1;
3227                        should_notify_peers = false;
3228                        goto re_arm;
3229                }
3230
3231                bond_ab_arp_commit(bond);
3232
3233                rtnl_unlock();
3234                rcu_read_lock();
3235        }
3236
3237        should_notify_rtnl = bond_ab_arp_probe(bond);
3238        rcu_read_unlock();
3239
3240re_arm:
3241        if (bond->params.arp_interval)
3242                queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3243
3244        if (should_notify_peers || should_notify_rtnl) {
3245                if (!rtnl_trylock())
3246                        return;
3247
3248                if (should_notify_peers)
3249                        call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
3250                                                 bond->dev);
3251                if (should_notify_rtnl) {
3252                        bond_slave_state_notify(bond);
3253                        bond_slave_link_notify(bond);
3254                }
3255
3256                rtnl_unlock();
3257        }
3258}
3259
3260static void bond_arp_monitor(struct work_struct *work)
3261{
3262        struct bonding *bond = container_of(work, struct bonding,
3263                                            arp_work.work);
3264
3265        if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3266                bond_activebackup_arp_mon(bond);
3267        else
3268                bond_loadbalance_arp_mon(bond);
3269}
3270
3271/*-------------------------- netdev event handling --------------------------*/
3272
3273/* Change device name */
3274static int bond_event_changename(struct bonding *bond)
3275{
3276        bond_remove_proc_entry(bond);
3277        bond_create_proc_entry(bond);
3278
3279        bond_debug_reregister(bond);
3280
3281        return NOTIFY_DONE;
3282}
3283
3284static int bond_master_netdev_event(unsigned long event,
3285                                    struct net_device *bond_dev)
3286{
3287        struct bonding *event_bond = netdev_priv(bond_dev);
3288
3289        netdev_dbg(bond_dev, "%s called\n", __func__);
3290
3291        switch (event) {
3292        case NETDEV_CHANGENAME:
3293                return bond_event_changename(event_bond);
3294        case NETDEV_UNREGISTER:
3295                bond_remove_proc_entry(event_bond);
3296                break;
3297        case NETDEV_REGISTER:
3298                bond_create_proc_entry(event_bond);
3299                break;
3300        default:
3301                break;
3302        }
3303
3304        return NOTIFY_DONE;
3305}
3306
3307static int bond_slave_netdev_event(unsigned long event,
3308                                   struct net_device *slave_dev)
3309{
3310        struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3311        struct bonding *bond;
3312        struct net_device *bond_dev;
3313
3314        /* A netdev event can be generated while enslaving a device
3315         * before netdev_rx_handler_register is called in which case
3316         * slave will be NULL
3317         */
3318        if (!slave) {
3319                netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__);
3320                return NOTIFY_DONE;
3321        }
3322
3323        bond_dev = slave->bond->dev;
3324        bond = slave->bond;
3325        primary = rtnl_dereference(bond->primary_slave);
3326
3327        slave_dbg(bond_dev, slave_dev, "%s called\n", __func__);
3328
3329        switch (event) {
3330        case NETDEV_UNREGISTER:
3331                if (bond_dev->type != ARPHRD_ETHER)
3332                        bond_release_and_destroy(bond_dev, slave_dev);
3333                else
3334                        __bond_release_one(bond_dev, slave_dev, false, true);
3335                break;
3336        case NETDEV_UP:
3337        case NETDEV_CHANGE:
3338                /* For 802.3ad mode only:
3339                 * Getting invalid Speed/Duplex values here will put slave
3340                 * in weird state. Mark it as link-fail if the link was
3341                 * previously up or link-down if it hasn't yet come up, and
3342                 * let link-monitoring (miimon) set it right when correct
3343                 * speeds/duplex are available.
3344                 */
3345                if (bond_update_speed_duplex(slave) &&
3346                    BOND_MODE(bond) == BOND_MODE_8023AD) {
3347                        if (slave->last_link_up)
3348                                slave->link = BOND_LINK_FAIL;
3349                        else
3350                                slave->link = BOND_LINK_DOWN;
3351                }
3352
3353                if (BOND_MODE(bond) == BOND_MODE_8023AD)
3354                        bond_3ad_adapter_speed_duplex_changed(slave);
3355                fallthrough;
3356        case NETDEV_DOWN:
3357                /* Refresh slave-array if applicable!
3358                 * If the setup does not use miimon or arpmon (mode-specific!),
3359                 * then these events will not cause the slave-array to be
3360                 * refreshed. This will cause xmit to use a slave that is not
3361                 * usable. Avoid such situation by refeshing the array at these
3362                 * events. If these (miimon/arpmon) parameters are configured
3363                 * then array gets refreshed twice and that should be fine!
3364                 */
3365                if (bond_mode_can_use_xmit_hash(bond))
3366                        bond_update_slave_arr(bond, NULL);
3367                break;
3368        case NETDEV_CHANGEMTU:
3369                /* TODO: Should slaves be allowed to
3370                 * independently alter their MTU?  For
3371                 * an active-backup bond, slaves need
3372                 * not be the same type of device, so
3373                 * MTUs may vary.  For other modes,
3374                 * slaves arguably should have the
3375                 * same MTUs. To do this, we'd need to
3376                 * take over the slave's change_mtu
3377                 * function for the duration of their
3378                 * servitude.
3379                 */
3380                break;
3381        case NETDEV_CHANGENAME:
3382                /* we don't care if we don't have primary set */
3383                if (!bond_uses_primary(bond) ||
3384                    !bond->params.primary[0])
3385                        break;
3386
3387                if (slave == primary) {
3388                        /* slave's name changed - he's no longer primary */
3389                        RCU_INIT_POINTER(bond->primary_slave, NULL);
3390                } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3391                        /* we have a new primary slave */
3392                        rcu_assign_pointer(bond->primary_slave, slave);
3393                } else { /* we didn't change primary - exit */
3394                        break;
3395                }
3396
3397                netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3398                            primary ? slave_dev->name : "none");
3399
3400                block_netpoll_tx();
3401                bond_select_active_slave(bond);
3402                unblock_netpoll_tx();
3403                break;
3404        case NETDEV_FEAT_CHANGE:
3405                bond_compute_features(bond);
3406                break;
3407        case NETDEV_RESEND_IGMP:
3408                /* Propagate to master device */
3409                call_netdevice_notifiers(event, slave->bond->dev);
3410                break;
3411        default:
3412                break;
3413        }
3414
3415        return NOTIFY_DONE;
3416}
3417
3418/* bond_netdev_event: handle netdev notifier chain events.
3419 *
3420 * This function receives events for the netdev chain.  The caller (an
3421 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3422 * locks for us to safely manipulate the slave devices (RTNL lock,
3423 * dev_probe_lock).
3424 */
3425static int bond_netdev_event(struct notifier_block *this,
3426                             unsigned long event, void *ptr)
3427{
3428        struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3429
3430        netdev_dbg(event_dev, "%s received %s\n",
3431                   __func__, netdev_cmd_to_name(event));
3432
3433        if (!(event_dev->priv_flags & IFF_BONDING))
3434                return NOTIFY_DONE;
3435
3436        if (event_dev->flags & IFF_MASTER) {
3437                int ret;
3438
3439                ret = bond_master_netdev_event(event, event_dev);
3440                if (ret != NOTIFY_DONE)
3441                        return ret;
3442        }
3443
3444        if (event_dev->flags & IFF_SLAVE)
3445                return bond_slave_netdev_event(event, event_dev);
3446
3447        return NOTIFY_DONE;
3448}
3449
3450static struct notifier_block bond_netdev_notifier = {
3451        .notifier_call = bond_netdev_event,
3452};
3453
3454/*---------------------------- Hashing Policies -----------------------------*/
3455
3456/* L2 hash helper */
3457static inline u32 bond_eth_hash(struct sk_buff *skb)
3458{
3459        struct ethhdr *ep, hdr_tmp;
3460
3461        ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3462        if (ep)
3463                return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3464        return 0;
3465}
3466
3467static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk,
3468                         int *noff, int *proto, bool l34)
3469{
3470        const struct ipv6hdr *iph6;
3471        const struct iphdr *iph;
3472
3473        if (skb->protocol == htons(ETH_P_IP)) {
3474                if (unlikely(!pskb_may_pull(skb, *noff + sizeof(*iph))))
3475                        return false;
3476                iph = (const struct iphdr *)(skb->data + *noff);
3477                iph_to_flow_copy_v4addrs(fk, iph);
3478                *noff += iph->ihl << 2;
3479                if (!ip_is_fragment(iph))
3480                        *proto = iph->protocol;
3481        } else if (skb->protocol == htons(ETH_P_IPV6)) {
3482                if (unlikely(!pskb_may_pull(skb, *noff + sizeof(*iph6))))
3483                        return false;
3484                iph6 = (const struct ipv6hdr *)(skb->data + *noff);
3485                iph_to_flow_copy_v6addrs(fk, iph6);
3486                *noff += sizeof(*iph6);
3487                *proto = iph6->nexthdr;
3488        } else {
3489                return false;
3490        }
3491
3492        if (l34 && *proto >= 0)
3493                fk->ports.ports = skb_flow_get_ports(skb, *noff, *proto);
3494
3495        return true;
3496}
3497
3498/* Extract the appropriate headers based on bond's xmit policy */
3499static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3500                              struct flow_keys *fk)
3501{
3502        bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34;
3503        int noff, proto = -1;
3504
3505        if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23) {
3506                memset(fk, 0, sizeof(*fk));
3507                return __skb_flow_dissect(NULL, skb, &flow_keys_bonding,
3508                                          fk, NULL, 0, 0, 0, 0);
3509        }
3510
3511        fk->ports.ports = 0;
3512        memset(&fk->icmp, 0, sizeof(fk->icmp));
3513        noff = skb_network_offset(skb);
3514        if (!bond_flow_ip(skb, fk, &noff, &proto, l34))
3515                return false;
3516
3517        /* ICMP error packets contains at least 8 bytes of the header
3518         * of the packet which generated the error. Use this information
3519         * to correlate ICMP error packets within the same flow which
3520         * generated the error.
3521         */
3522        if (proto == IPPROTO_ICMP || proto == IPPROTO_ICMPV6) {
3523                skb_flow_get_icmp_tci(skb, &fk->icmp, skb->data,
3524                                      skb_transport_offset(skb),
3525                                      skb_headlen(skb));
3526                if (proto == IPPROTO_ICMP) {
3527                        if (!icmp_is_err(fk->icmp.type))
3528                                return true;
3529
3530                        noff += sizeof(struct icmphdr);
3531                } else if (proto == IPPROTO_ICMPV6) {
3532                        if (!icmpv6_is_err(fk->icmp.type))
3533                                return true;
3534
3535                        noff += sizeof(struct icmp6hdr);
3536                }
3537                return bond_flow_ip(skb, fk, &noff, &proto, l34);
3538        }
3539
3540        return true;
3541}
3542
3543/**
3544 * bond_xmit_hash - generate a hash value based on the xmit policy
3545 * @bond: bonding device
3546 * @skb: buffer to use for headers
3547 *
3548 * This function will extract the necessary headers from the skb buffer and use
3549 * them to generate a hash based on the xmit_policy set in the bonding device
3550 */
3551u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3552{
3553        struct flow_keys flow;
3554        u32 hash;
3555
3556        if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3557            skb->l4_hash)
3558                return skb->hash;
3559
3560        if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3561            !bond_flow_dissect(bond, skb, &flow))
3562                return bond_eth_hash(skb);
3563
3564        if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3565            bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) {
3566                hash = bond_eth_hash(skb);
3567        } else {
3568                if (flow.icmp.id)
3569                        memcpy(&hash, &flow.icmp, sizeof(hash));
3570                else
3571                        memcpy(&hash, &flow.ports.ports, sizeof(hash));
3572        }
3573        hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3574                (__force u32)flow_get_u32_src(&flow);
3575        hash ^= (hash >> 16);
3576        hash ^= (hash >> 8);
3577
3578        return hash >> 1;
3579}
3580
3581/*-------------------------- Device entry points ----------------------------*/
3582
3583void bond_work_init_all(struct bonding *bond)
3584{
3585        INIT_DELAYED_WORK(&bond->mcast_work,
3586                          bond_resend_igmp_join_requests_delayed);
3587        INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3588        INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3589        INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);
3590        INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3591        INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3592}
3593
3594static void bond_work_cancel_all(struct bonding *bond)
3595{
3596        cancel_delayed_work_sync(&bond->mii_work);
3597        cancel_delayed_work_sync(&bond->arp_work);
3598        cancel_delayed_work_sync(&bond->alb_work);
3599        cancel_delayed_work_sync(&bond->ad_work);
3600        cancel_delayed_work_sync(&bond->mcast_work);
3601        cancel_delayed_work_sync(&bond->slave_arr_work);
3602}
3603
3604static int bond_open(struct net_device *bond_dev)
3605{
3606        struct bonding *bond = netdev_priv(bond_dev);
3607        struct list_head *iter;
3608        struct slave *slave;
3609
3610        /* reset slave->backup and slave->inactive */
3611        if (bond_has_slaves(bond)) {
3612                bond_for_each_slave(bond, slave, iter) {
3613                        if (bond_uses_primary(bond) &&
3614                            slave != rcu_access_pointer(bond->curr_active_slave)) {
3615                                bond_set_slave_inactive_flags(slave,
3616                                                              BOND_SLAVE_NOTIFY_NOW);
3617                        } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3618                                bond_set_slave_active_flags(slave,
3619                                                            BOND_SLAVE_NOTIFY_NOW);
3620                        }
3621                }
3622        }
3623
3624        if (bond_is_lb(bond)) {
3625                /* bond_alb_initialize must be called before the timer
3626                 * is started.
3627                 */
3628                if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3629                        return -ENOMEM;
3630                if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB)
3631                        queue_delayed_work(bond->wq, &bond->alb_work, 0);
3632        }
3633
3634        if (bond->params.miimon)  /* link check interval, in milliseconds. */
3635                queue_delayed_work(bond->wq, &bond->mii_work, 0);
3636
3637        if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3638                queue_delayed_work(bond->wq, &bond->arp_work, 0);
3639                bond->recv_probe = bond_arp_rcv;
3640        }
3641
3642        if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3643                queue_delayed_work(bond->wq, &bond->ad_work, 0);
3644                /* register to receive LACPDUs */
3645                bond->recv_probe = bond_3ad_lacpdu_recv;
3646                bond_3ad_initiate_agg_selection(bond, 1);
3647        }
3648
3649        if (bond_mode_can_use_xmit_hash(bond))
3650                bond_update_slave_arr(bond, NULL);
3651
3652        return 0;
3653}
3654
3655static int bond_close(struct net_device *bond_dev)
3656{
3657        struct bonding *bond = netdev_priv(bond_dev);
3658
3659        bond_work_cancel_all(bond);
3660        bond->send_peer_notif = 0;
3661        if (bond_is_lb(bond))
3662                bond_alb_deinitialize(bond);
3663        bond->recv_probe = NULL;
3664
3665        return 0;
3666}
3667
3668/* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3669 * that some drivers can provide 32bit values only.
3670 */
3671static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3672                            const struct rtnl_link_stats64 *_new,
3673                            const struct rtnl_link_stats64 *_old)
3674{
3675        const u64 *new = (const u64 *)_new;
3676        const u64 *old = (const u64 *)_old;
3677        u64 *res = (u64 *)_res;
3678        int i;
3679
3680        for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3681                u64 nv = new[i];
3682                u64 ov = old[i];
3683                s64 delta = nv - ov;
3684
3685                /* detects if this particular field is 32bit only */
3686                if (((nv | ov) >> 32) == 0)
3687                        delta = (s64)(s32)((u32)nv - (u32)ov);
3688
3689                /* filter anomalies, some drivers reset their stats
3690                 * at down/up events.
3691                 */
3692                if (delta > 0)
3693                        res[i] += delta;
3694        }
3695}
3696
3697#ifdef CONFIG_LOCKDEP
3698static int bond_get_lowest_level_rcu(struct net_device *dev)
3699{
3700        struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
3701        struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
3702        int cur = 0, max = 0;
3703
3704        now = dev;
3705        iter = &dev->adj_list.lower;
3706
3707        while (1) {
3708                next = NULL;
3709                while (1) {
3710                        ldev = netdev_next_lower_dev_rcu(now, &iter);
3711                        if (!ldev)
3712                                break;
3713
3714                        next = ldev;
3715                        niter = &ldev->adj_list.lower;
3716                        dev_stack[cur] = now;
3717                        iter_stack[cur++] = iter;
3718                        if (max <= cur)
3719                                max = cur;
3720                        break;
3721                }
3722
3723                if (!next) {
3724                        if (!cur)
3725                                return max;
3726                        next = dev_stack[--cur];
3727                        niter = iter_stack[cur];
3728                }
3729
3730                now = next;
3731                iter = niter;
3732        }
3733
3734        return max;
3735}
3736#endif
3737
3738static void bond_get_stats(struct net_device *bond_dev,
3739                           struct rtnl_link_stats64 *stats)
3740{
3741        struct bonding *bond = netdev_priv(bond_dev);
3742        struct rtnl_link_stats64 temp;
3743        struct list_head *iter;
3744        struct slave *slave;
3745        int nest_level = 0;
3746
3747
3748        rcu_read_lock();
3749#ifdef CONFIG_LOCKDEP
3750        nest_level = bond_get_lowest_level_rcu(bond_dev);
3751#endif
3752
3753        spin_lock_nested(&bond->stats_lock, nest_level);
3754        memcpy(stats, &bond->bond_stats, sizeof(*stats));
3755
3756        bond_for_each_slave_rcu(bond, slave, iter) {
3757                const struct rtnl_link_stats64 *new =
3758                        dev_get_stats(slave->dev, &temp);
3759
3760                bond_fold_stats(stats, new, &slave->slave_stats);
3761
3762                /* save off the slave stats for the next run */
3763                memcpy(&slave->slave_stats, new, sizeof(*new));
3764        }
3765
3766        memcpy(&bond->bond_stats, stats, sizeof(*stats));
3767        spin_unlock(&bond->stats_lock);
3768        rcu_read_unlock();
3769}
3770
3771static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3772{
3773        struct bonding *bond = netdev_priv(bond_dev);
3774        struct net_device *slave_dev = NULL;
3775        struct ifbond k_binfo;
3776        struct ifbond __user *u_binfo = NULL;
3777        struct ifslave k_sinfo;
3778        struct ifslave __user *u_sinfo = NULL;
3779        struct mii_ioctl_data *mii = NULL;
3780        struct bond_opt_value newval;
3781        struct net *net;
3782        int res = 0;
3783
3784        netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3785
3786        switch (cmd) {
3787        case SIOCGMIIPHY:
3788                mii = if_mii(ifr);
3789                if (!mii)
3790                        return -EINVAL;
3791
3792                mii->phy_id = 0;
3793                fallthrough;
3794        case SIOCGMIIREG:
3795                /* We do this again just in case we were called by SIOCGMIIREG
3796                 * instead of SIOCGMIIPHY.
3797                 */
3798                mii = if_mii(ifr);
3799                if (!mii)
3800                        return -EINVAL;
3801
3802                if (mii->reg_num == 1) {
3803                        mii->val_out = 0;
3804                        if (netif_carrier_ok(bond->dev))
3805                                mii->val_out = BMSR_LSTATUS;
3806                }
3807
3808                return 0;
3809        case BOND_INFO_QUERY_OLD:
3810        case SIOCBONDINFOQUERY:
3811                u_binfo = (struct ifbond __user *)ifr->ifr_data;
3812
3813                if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3814                        return -EFAULT;
3815
3816                bond_info_query(bond_dev, &k_binfo);
3817                if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3818                        return -EFAULT;
3819
3820                return 0;
3821        case BOND_SLAVE_INFO_QUERY_OLD:
3822        case SIOCBONDSLAVEINFOQUERY:
3823                u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3824
3825                if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3826                        return -EFAULT;
3827
3828                res = bond_slave_info_query(bond_dev, &k_sinfo);
3829                if (res == 0 &&
3830                    copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3831                        return -EFAULT;
3832
3833                return res;
3834        default:
3835                break;
3836        }
3837
3838        net = dev_net(bond_dev);
3839
3840        if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3841                return -EPERM;
3842
3843        slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3844
3845        slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev);
3846
3847        if (!slave_dev)
3848                return -ENODEV;
3849
3850        switch (cmd) {
3851        case BOND_ENSLAVE_OLD:
3852        case SIOCBONDENSLAVE:
3853                res = bond_enslave(bond_dev, slave_dev, NULL);
3854                break;
3855        case BOND_RELEASE_OLD:
3856        case SIOCBONDRELEASE:
3857                res = bond_release(bond_dev, slave_dev);
3858                break;
3859        case BOND_SETHWADDR_OLD:
3860        case SIOCBONDSETHWADDR:
3861                res = bond_set_dev_addr(bond_dev, slave_dev);
3862                break;
3863        case BOND_CHANGE_ACTIVE_OLD:
3864        case SIOCBONDCHANGEACTIVE:
3865                bond_opt_initstr(&newval, slave_dev->name);
3866                res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,
3867                                            &newval);
3868                break;
3869        default:
3870                res = -EOPNOTSUPP;
3871        }
3872
3873        return res;
3874}
3875
3876static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3877{
3878        struct bonding *bond = netdev_priv(bond_dev);
3879
3880        if (change & IFF_PROMISC)
3881                bond_set_promiscuity(bond,
3882                                     bond_dev->flags & IFF_PROMISC ? 1 : -1);
3883
3884        if (change & IFF_ALLMULTI)
3885                bond_set_allmulti(bond,
3886                                  bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3887}
3888
3889static void bond_set_rx_mode(struct net_device *bond_dev)
3890{
3891        struct bonding *bond = netdev_priv(bond_dev);
3892        struct list_head *iter;
3893        struct slave *slave;
3894
3895        rcu_read_lock();
3896        if (bond_uses_primary(bond)) {
3897                slave = rcu_dereference(bond->curr_active_slave);
3898                if (slave) {
3899                        dev_uc_sync(slave->dev, bond_dev);
3900                        dev_mc_sync(slave->dev, bond_dev);
3901                }
3902        } else {
3903                bond_for_each_slave_rcu(bond, slave, iter) {
3904                        dev_uc_sync_multiple(slave->dev, bond_dev);
3905                        dev_mc_sync_multiple(slave->dev, bond_dev);
3906                }
3907        }
3908        rcu_read_unlock();
3909}
3910
3911static int bond_neigh_init(struct neighbour *n)
3912{
3913        struct bonding *bond = netdev_priv(n->dev);
3914        const struct net_device_ops *slave_ops;
3915        struct neigh_parms parms;
3916        struct slave *slave;
3917        int ret = 0;
3918
3919        rcu_read_lock();
3920        slave = bond_first_slave_rcu(bond);
3921        if (!slave)
3922                goto out;
3923        slave_ops = slave->dev->netdev_ops;
3924        if (!slave_ops->ndo_neigh_setup)
3925                goto out;
3926
3927        /* TODO: find another way [1] to implement this.
3928         * Passing a zeroed structure is fragile,
3929         * but at least we do not pass garbage.
3930         *
3931         * [1] One way would be that ndo_neigh_setup() never touch
3932         *     struct neigh_parms, but propagate the new neigh_setup()
3933         *     back to ___neigh_create() / neigh_parms_alloc()
3934         */
3935        memset(&parms, 0, sizeof(parms));
3936        ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3937
3938        if (ret)
3939                goto out;
3940
3941        if (parms.neigh_setup)
3942                ret = parms.neigh_setup(n);
3943out:
3944        rcu_read_unlock();
3945        return ret;
3946}
3947
3948/* The bonding ndo_neigh_setup is called at init time beofre any
3949 * slave exists. So we must declare proxy setup function which will
3950 * be used at run time to resolve the actual slave neigh param setup.
3951 *
3952 * It's also called by master devices (such as vlans) to setup their
3953 * underlying devices. In that case - do nothing, we're already set up from
3954 * our init.
3955 */
3956static int bond_neigh_setup(struct net_device *dev,
3957                            struct neigh_parms *parms)
3958{
3959        /* modify only our neigh_parms */
3960        if (parms->dev == dev)
3961                parms->neigh_setup = bond_neigh_init;
3962
3963        return 0;
3964}
3965
3966/* Change the MTU of all of a master's slaves to match the master */
3967static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3968{
3969        struct bonding *bond = netdev_priv(bond_dev);
3970        struct slave *slave, *rollback_slave;
3971        struct list_head *iter;
3972        int res = 0;
3973
3974        netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3975
3976        bond_for_each_slave(bond, slave, iter) {
3977                slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n",
3978                           slave, slave->dev->netdev_ops->ndo_change_mtu);
3979
3980                res = dev_set_mtu(slave->dev, new_mtu);
3981
3982                if (res) {
3983                        /* If we failed to set the slave's mtu to the new value
3984                         * we must abort the operation even in ACTIVE_BACKUP
3985                         * mode, because if we allow the backup slaves to have
3986                         * different mtu values than the active slave we'll
3987                         * need to change their mtu when doing a failover. That
3988                         * means changing their mtu from timer context, which
3989                         * is probably not a good idea.
3990                         */
3991                        slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n",
3992                                  res, new_mtu);
3993                        goto unwind;
3994                }
3995        }
3996
3997        bond_dev->mtu = new_mtu;
3998
3999        return 0;
4000
4001unwind:
4002        /* unwind from head to the slave that failed */
4003        bond_for_each_slave(bond, rollback_slave, iter) {
4004                int tmp_res;
4005
4006                if (rollback_slave == slave)
4007                        break;
4008
4009                tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
4010                if (tmp_res)
4011                        slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n",
4012                                  tmp_res);
4013        }
4014
4015        return res;
4016}
4017
4018/* Change HW address
4019 *
4020 * Note that many devices must be down to change the HW address, and
4021 * downing the master releases all slaves.  We can make bonds full of
4022 * bonding devices to test this, however.
4023 */
4024static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4025{
4026        struct bonding *bond = netdev_priv(bond_dev);
4027        struct slave *slave, *rollback_slave;
4028        struct sockaddr_storage *ss = addr, tmp_ss;
4029        struct list_head *iter;
4030        int res = 0;
4031
4032        if (BOND_MODE(bond) == BOND_MODE_ALB)
4033                return bond_alb_set_mac_address(bond_dev, addr);
4034
4035
4036        netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond);
4037
4038        /* If fail_over_mac is enabled, do nothing and return success.
4039         * Returning an error causes ifenslave to fail.
4040         */
4041        if (bond->params.fail_over_mac &&
4042            BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
4043                return 0;
4044
4045        if (!is_valid_ether_addr(ss->__data))
4046                return -EADDRNOTAVAIL;
4047
4048        bond_for_each_slave(bond, slave, iter) {
4049                slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n",
4050                          __func__, slave);
4051                res = dev_set_mac_address(slave->dev, addr, NULL);
4052                if (res) {
4053                        /* TODO: consider downing the slave
4054                         * and retry ?
4055                         * User should expect communications
4056                         * breakage anyway until ARP finish
4057                         * updating, so...
4058                         */
4059                        slave_dbg(bond_dev, slave->dev, "%s: err %d\n",
4060                                  __func__, res);
4061                        goto unwind;
4062                }
4063        }
4064
4065        /* success */
4066        memcpy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len);
4067        return 0;
4068
4069unwind:
4070        memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
4071        tmp_ss.ss_family = bond_dev->type;
4072
4073        /* unwind from head to the slave that failed */
4074        bond_for_each_slave(bond, rollback_slave, iter) {
4075                int tmp_res;
4076
4077                if (rollback_slave == slave)
4078                        break;
4079
4080                tmp_res = dev_set_mac_address(rollback_slave->dev,
4081                                              (struct sockaddr *)&tmp_ss, NULL);
4082                if (tmp_res) {
4083                        slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n",
4084                                   __func__, tmp_res);
4085                }
4086        }
4087
4088        return res;
4089}
4090
4091/**
4092 * bond_get_slave_by_id - get xmit slave with slave_id
4093 * @bond: bonding device that is transmitting
4094 * @slave_id: slave id up to slave_cnt-1 through which to transmit
4095 *
4096 * This function tries to get slave with slave_id but in case
4097 * it fails, it tries to find the first available slave for transmission.
4098 */
4099static struct slave *bond_get_slave_by_id(struct bonding *bond,
4100                                          int slave_id)
4101{
4102        struct list_head *iter;
4103        struct slave *slave;
4104        int i = slave_id;
4105
4106        /* Here we start from the slave with slave_id */
4107        bond_for_each_slave_rcu(bond, slave, iter) {
4108                if (--i < 0) {
4109                        if (bond_slave_can_tx(slave))
4110                                return slave;
4111                }
4112        }
4113
4114        /* Here we start from the first slave up to slave_id */
4115        i = slave_id;
4116        bond_for_each_slave_rcu(bond, slave, iter) {
4117                if (--i < 0)
4118                        break;
4119                if (bond_slave_can_tx(slave))
4120                        return slave;
4121        }
4122        /* no slave that can tx has been found */
4123        return NULL;
4124}
4125
4126/**
4127 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
4128 * @bond: bonding device to use
4129 *
4130 * Based on the value of the bonding device's packets_per_slave parameter
4131 * this function generates a slave id, which is usually used as the next
4132 * slave to transmit through.
4133 */
4134static u32 bond_rr_gen_slave_id(struct bonding *bond)
4135{
4136        u32 slave_id;
4137        struct reciprocal_value reciprocal_packets_per_slave;
4138        int packets_per_slave = bond->params.packets_per_slave;
4139
4140        switch (packets_per_slave) {
4141        case 0:
4142                slave_id = prandom_u32();
4143                break;
4144        case 1:
4145                slave_id = bond->rr_tx_counter;
4146                break;
4147        default:
4148                reciprocal_packets_per_slave =
4149                        bond->params.reciprocal_packets_per_slave;
4150                slave_id = reciprocal_divide(bond->rr_tx_counter,
4151                                             reciprocal_packets_per_slave);
4152                break;
4153        }
4154        bond->rr_tx_counter++;
4155
4156        return slave_id;
4157}
4158
4159static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond,
4160                                                    struct sk_buff *skb)
4161{
4162        struct slave *slave;
4163        int slave_cnt;
4164        u32 slave_id;
4165
4166        /* Start with the curr_active_slave that joined the bond as the
4167         * default for sending IGMP traffic.  For failover purposes one
4168         * needs to maintain some consistency for the interface that will
4169         * send the join/membership reports.  The curr_active_slave found
4170         * will send all of this type of traffic.
4171         */
4172        if (skb->protocol == htons(ETH_P_IP)) {
4173                int noff = skb_network_offset(skb);
4174                struct iphdr *iph;
4175
4176                if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
4177                        goto non_igmp;
4178
4179                iph = ip_hdr(skb);
4180                if (iph->protocol == IPPROTO_IGMP) {
4181                        slave = rcu_dereference(bond->curr_active_slave);
4182                        if (slave)
4183                                return slave;
4184                        return bond_get_slave_by_id(bond, 0);
4185                }
4186        }
4187
4188non_igmp:
4189        slave_cnt = READ_ONCE(bond->slave_cnt);
4190        if (likely(slave_cnt)) {
4191                slave_id = bond_rr_gen_slave_id(bond) % slave_cnt;
4192                return bond_get_slave_by_id(bond, slave_id);
4193        }
4194        return NULL;
4195}
4196
4197static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb,
4198                                        struct net_device *bond_dev)
4199{
4200        struct bonding *bond = netdev_priv(bond_dev);
4201        struct slave *slave;
4202
4203        slave = bond_xmit_roundrobin_slave_get(bond, skb);
4204        if (likely(slave))
4205                return bond_dev_queue_xmit(bond, skb, slave->dev);
4206
4207        return bond_tx_drop(bond_dev, skb);
4208}
4209
4210static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond,
4211                                                      struct sk_buff *skb)
4212{
4213        return rcu_dereference(bond->curr_active_slave);
4214}
4215
4216/* In active-backup mode, we know that bond->curr_active_slave is always valid if
4217 * the bond has a usable interface.
4218 */
4219static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb,
4220                                          struct net_device *bond_dev)
4221{
4222        struct bonding *bond = netdev_priv(bond_dev);
4223        struct slave *slave;
4224
4225        slave = bond_xmit_activebackup_slave_get(bond, skb);
4226        if (slave)
4227                return bond_dev_queue_xmit(bond, skb, slave->dev);
4228
4229        return bond_tx_drop(bond_dev, skb);
4230}
4231
4232/* Use this to update slave_array when (a) it's not appropriate to update
4233 * slave_array right away (note that update_slave_array() may sleep)
4234 * and / or (b) RTNL is not held.
4235 */
4236void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
4237{
4238        queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
4239}
4240
4241/* Slave array work handler. Holds only RTNL */
4242static void bond_slave_arr_handler(struct work_struct *work)
4243{
4244        struct bonding *bond = container_of(work, struct bonding,
4245                                            slave_arr_work.work);
4246        int ret;
4247
4248        if (!rtnl_trylock())
4249                goto err;
4250
4251        ret = bond_update_slave_arr(bond, NULL);
4252        rtnl_unlock();
4253        if (ret) {
4254                pr_warn_ratelimited("Failed to update slave array from WT\n");
4255                goto err;
4256        }
4257        return;
4258
4259err:
4260        bond_slave_arr_work_rearm(bond, 1);
4261}
4262
4263static void bond_skip_slave(struct bond_up_slave *slaves,
4264                            struct slave *skipslave)
4265{
4266        int idx;
4267
4268        /* Rare situation where caller has asked to skip a specific
4269         * slave but allocation failed (most likely!). BTW this is
4270         * only possible when the call is initiated from
4271         * __bond_release_one(). In this situation; overwrite the
4272         * skipslave entry in the array with the last entry from the
4273         * array to avoid a situation where the xmit path may choose
4274         * this to-be-skipped slave to send a packet out.
4275         */
4276        for (idx = 0; slaves && idx < slaves->count; idx++) {
4277                if (skipslave == slaves->arr[idx]) {
4278                        slaves->arr[idx] =
4279                                slaves->arr[slaves->count - 1];
4280                        slaves->count--;
4281                        break;
4282                }
4283        }
4284}
4285
4286static void bond_set_slave_arr(struct bonding *bond,
4287                               struct bond_up_slave *usable_slaves,
4288                               struct bond_up_slave *all_slaves)
4289{
4290        struct bond_up_slave *usable, *all;
4291
4292        usable = rtnl_dereference(bond->usable_slaves);
4293        rcu_assign_pointer(bond->usable_slaves, usable_slaves);
4294        kfree_rcu(usable, rcu);
4295
4296        all = rtnl_dereference(bond->all_slaves);
4297        rcu_assign_pointer(bond->all_slaves, all_slaves);
4298        kfree_rcu(all, rcu);
4299}
4300
4301static void bond_reset_slave_arr(struct bonding *bond)
4302{
4303        struct bond_up_slave *usable, *all;
4304
4305        usable = rtnl_dereference(bond->usable_slaves);
4306        if (usable) {
4307                RCU_INIT_POINTER(bond->usable_slaves, NULL);
4308                kfree_rcu(usable, rcu);
4309        }
4310
4311        all = rtnl_dereference(bond->all_slaves);
4312        if (all) {
4313                RCU_INIT_POINTER(bond->all_slaves, NULL);
4314                kfree_rcu(all, rcu);
4315        }
4316}
4317
4318/* Build the usable slaves array in control path for modes that use xmit-hash
4319 * to determine the slave interface -
4320 * (a) BOND_MODE_8023AD
4321 * (b) BOND_MODE_XOR
4322 * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0
4323 *
4324 * The caller is expected to hold RTNL only and NO other lock!
4325 */
4326int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
4327{
4328        struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL;
4329        struct slave *slave;
4330        struct list_head *iter;
4331        int agg_id = 0;
4332        int ret = 0;
4333
4334#ifdef CONFIG_LOCKDEP
4335        WARN_ON(lockdep_is_held(&bond->mode_lock));
4336#endif
4337
4338        usable_slaves = kzalloc(struct_size(usable_slaves, arr,
4339                                            bond->slave_cnt), GFP_KERNEL);
4340        all_slaves = kzalloc(struct_size(all_slaves, arr,
4341                                         bond->slave_cnt), GFP_KERNEL);
4342        if (!usable_slaves || !all_slaves) {
4343                ret = -ENOMEM;
4344                goto out;
4345        }
4346        if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4347                struct ad_info ad_info;
4348
4349                if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
4350                        pr_debug("bond_3ad_get_active_agg_info failed\n");
4351                        /* No active aggragator means it's not safe to use
4352                         * the previous array.
4353                         */
4354                        bond_reset_slave_arr(bond);
4355                        goto out;
4356                }
4357                agg_id = ad_info.aggregator_id;
4358        }
4359        bond_for_each_slave(bond, slave, iter) {
4360                if (skipslave == slave)
4361                        continue;
4362
4363                all_slaves->arr[all_slaves->count++] = slave;
4364                if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4365                        struct aggregator *agg;
4366
4367                        agg = SLAVE_AD_INFO(slave)->port.aggregator;
4368                        if (!agg || agg->aggregator_identifier != agg_id)
4369                                continue;
4370                }
4371                if (!bond_slave_can_tx(slave))
4372                        continue;
4373
4374                slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n",
4375                          usable_slaves->count);
4376
4377                usable_slaves->arr[usable_slaves->count++] = slave;
4378        }
4379
4380        bond_set_slave_arr(bond, usable_slaves, all_slaves);
4381        return ret;
4382out:
4383        if (ret != 0 && skipslave) {
4384                bond_skip_slave(rtnl_dereference(bond->all_slaves),
4385                                skipslave);
4386                bond_skip_slave(rtnl_dereference(bond->usable_slaves),
4387                                skipslave);
4388        }
4389        kfree_rcu(all_slaves, rcu);
4390        kfree_rcu(usable_slaves, rcu);
4391
4392        return ret;
4393}
4394
4395static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond,
4396                                                 struct sk_buff *skb,
4397                                                 struct bond_up_slave *slaves)
4398{
4399        struct slave *slave;
4400        unsigned int count;
4401        u32 hash;
4402
4403        hash = bond_xmit_hash(bond, skb);
4404        count = slaves ? READ_ONCE(slaves->count) : 0;
4405        if (unlikely(!count))
4406                return NULL;
4407
4408        slave = slaves->arr[hash % count];
4409        return slave;
4410}
4411
4412/* Use this Xmit function for 3AD as well as XOR modes. The current
4413 * usable slave array is formed in the control path. The xmit function
4414 * just calculates hash and sends the packet out.
4415 */
4416static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb,
4417                                     struct net_device *dev)
4418{
4419        struct bonding *bond = netdev_priv(dev);
4420        struct bond_up_slave *slaves;
4421        struct slave *slave;
4422
4423        slaves = rcu_dereference(bond->usable_slaves);
4424        slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
4425        if (likely(slave))
4426                return bond_dev_queue_xmit(bond, skb, slave->dev);
4427
4428        return bond_tx_drop(dev, skb);
4429}
4430
4431/* in broadcast mode, we send everything to all usable interfaces. */
4432static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb,
4433                                       struct net_device *bond_dev)
4434{
4435        struct bonding *bond = netdev_priv(bond_dev);
4436        struct slave *slave = NULL;
4437        struct list_head *iter;
4438
4439        bond_for_each_slave_rcu(bond, slave, iter) {
4440                if (bond_is_last_slave(bond, slave))
4441                        break;
4442                if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
4443                        struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4444
4445                        if (!skb2) {
4446                                net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
4447                                                    bond_dev->name, __func__);
4448                                continue;
4449                        }
4450                        bond_dev_queue_xmit(bond, skb2, slave->dev);
4451                }
4452        }
4453        if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
4454                return bond_dev_queue_xmit(bond, skb, slave->dev);
4455
4456        return bond_tx_drop(bond_dev, skb);
4457}
4458
4459/*------------------------- Device initialization ---------------------------*/
4460
4461/* Lookup the slave that corresponds to a qid */
4462static inline int bond_slave_override(struct bonding *bond,
4463                                      struct sk_buff *skb)
4464{
4465        struct slave *slave = NULL;
4466        struct list_head *iter;
4467
4468        if (!skb_rx_queue_recorded(skb))
4469                return 1;
4470
4471        /* Find out if any slaves have the same mapping as this skb. */
4472        bond_for_each_slave_rcu(bond, slave, iter) {
4473                if (slave->queue_id == skb_get_queue_mapping(skb)) {
4474                        if (bond_slave_is_up(slave) &&
4475                            slave->link == BOND_LINK_UP) {
4476                                bond_dev_queue_xmit(bond, skb, slave->dev);
4477                                return 0;
4478                        }
4479                        /* If the slave isn't UP, use default transmit policy. */
4480                        break;
4481                }
4482        }
4483
4484        return 1;
4485}
4486
4487
4488static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
4489                             struct net_device *sb_dev)
4490{
4491        /* This helper function exists to help dev_pick_tx get the correct
4492         * destination queue.  Using a helper function skips a call to
4493         * skb_tx_hash and will put the skbs in the queue we expect on their
4494         * way down to the bonding driver.
4495         */
4496        u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4497
4498        /* Save the original txq to restore before passing to the driver */
4499        qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb);
4500
4501        if (unlikely(txq >= dev->real_num_tx_queues)) {
4502                do {
4503                        txq -= dev->real_num_tx_queues;
4504                } while (txq >= dev->real_num_tx_queues);
4505        }
4506        return txq;
4507}
4508
4509static struct net_device *bond_xmit_get_slave(struct net_device *master_dev,
4510                                              struct sk_buff *skb,
4511                                              bool all_slaves)
4512{
4513        struct bonding *bond = netdev_priv(master_dev);
4514        struct bond_up_slave *slaves;
4515        struct slave *slave = NULL;
4516
4517        switch (BOND_MODE(bond)) {
4518        case BOND_MODE_ROUNDROBIN:
4519                slave = bond_xmit_roundrobin_slave_get(bond, skb);
4520                break;
4521        case BOND_MODE_ACTIVEBACKUP:
4522                slave = bond_xmit_activebackup_slave_get(bond, skb);
4523                break;
4524        case BOND_MODE_8023AD:
4525        case BOND_MODE_XOR:
4526                if (all_slaves)
4527                        slaves = rcu_dereference(bond->all_slaves);
4528                else
4529                        slaves = rcu_dereference(bond->usable_slaves);
4530                slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
4531                break;
4532        case BOND_MODE_BROADCAST:
4533                break;
4534        case BOND_MODE_ALB:
4535                slave = bond_xmit_alb_slave_get(bond, skb);
4536                break;
4537        case BOND_MODE_TLB:
4538                slave = bond_xmit_tlb_slave_get(bond, skb);
4539                break;
4540        default:
4541                /* Should never happen, mode already checked */
4542                WARN_ONCE(true, "Unknown bonding mode");
4543                break;
4544        }
4545
4546        if (slave)
4547                return slave->dev;
4548        return NULL;
4549}
4550
4551static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4552{
4553        struct bonding *bond = netdev_priv(dev);
4554
4555        if (bond_should_override_tx_queue(bond) &&
4556            !bond_slave_override(bond, skb))
4557                return NETDEV_TX_OK;
4558
4559        switch (BOND_MODE(bond)) {
4560        case BOND_MODE_ROUNDROBIN:
4561                return bond_xmit_roundrobin(skb, dev);
4562        case BOND_MODE_ACTIVEBACKUP:
4563                return bond_xmit_activebackup(skb, dev);
4564        case BOND_MODE_8023AD:
4565        case BOND_MODE_XOR:
4566                return bond_3ad_xor_xmit(skb, dev);
4567        case BOND_MODE_BROADCAST:
4568                return bond_xmit_broadcast(skb, dev);
4569        case BOND_MODE_ALB:
4570                return bond_alb_xmit(skb, dev);
4571        case BOND_MODE_TLB:
4572                return bond_tlb_xmit(skb, dev);
4573        default:
4574                /* Should never happen, mode already checked */
4575                netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4576                WARN_ON_ONCE(1);
4577                return bond_tx_drop(dev, skb);
4578        }
4579}
4580
4581static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4582{
4583        struct bonding *bond = netdev_priv(dev);
4584        netdev_tx_t ret = NETDEV_TX_OK;
4585
4586        /* If we risk deadlock from transmitting this in the
4587         * netpoll path, tell netpoll to queue the frame for later tx
4588         */
4589        if (unlikely(is_netpoll_tx_blocked(dev)))
4590                return NETDEV_TX_BUSY;
4591
4592        rcu_read_lock();
4593        if (bond_has_slaves(bond))
4594                ret = __bond_start_xmit(skb, dev);
4595        else
4596                ret = bond_tx_drop(dev, skb);
4597        rcu_read_unlock();
4598
4599        return ret;
4600}
4601
4602static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed)
4603{
4604        if (speed == 0 || speed == SPEED_UNKNOWN)
4605                speed = slave->speed;
4606        else
4607                speed = min(speed, slave->speed);
4608
4609        return speed;
4610}
4611
4612static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
4613                                           struct ethtool_link_ksettings *cmd)
4614{
4615        struct bonding *bond = netdev_priv(bond_dev);
4616        struct list_head *iter;
4617        struct slave *slave;
4618        u32 speed = 0;
4619
4620        cmd->base.duplex = DUPLEX_UNKNOWN;
4621        cmd->base.port = PORT_OTHER;
4622
4623        /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4624         * do not need to check mode.  Though link speed might not represent
4625         * the true receive or transmit bandwidth (not all modes are symmetric)
4626         * this is an accurate maximum.
4627         */
4628        bond_for_each_slave(bond, slave, iter) {
4629                if (bond_slave_can_tx(slave)) {
4630                        if (slave->speed != SPEED_UNKNOWN) {
4631                                if (BOND_MODE(bond) == BOND_MODE_BROADCAST)
4632                                        speed = bond_mode_bcast_speed(slave,
4633                                                                      speed);
4634                                else
4635                                        speed += slave->speed;
4636                        }
4637                        if (cmd->base.duplex == DUPLEX_UNKNOWN &&
4638                            slave->duplex != DUPLEX_UNKNOWN)
4639                                cmd->base.duplex = slave->duplex;
4640                }
4641        }
4642        cmd->base.speed = speed ? : SPEED_UNKNOWN;
4643
4644        return 0;
4645}
4646
4647static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4648                                     struct ethtool_drvinfo *drvinfo)
4649{
4650        strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4651        snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4652                 BOND_ABI_VERSION);
4653}
4654
4655static const struct ethtool_ops bond_ethtool_ops = {
4656        .get_drvinfo            = bond_ethtool_get_drvinfo,
4657        .get_link               = ethtool_op_get_link,
4658        .get_link_ksettings     = bond_ethtool_get_link_ksettings,
4659};
4660
4661static const struct net_device_ops bond_netdev_ops = {
4662        .ndo_init               = bond_init,
4663        .ndo_uninit             = bond_uninit,
4664        .ndo_open               = bond_open,
4665        .ndo_stop               = bond_close,
4666        .ndo_start_xmit         = bond_start_xmit,
4667        .ndo_select_queue       = bond_select_queue,
4668        .ndo_get_stats64        = bond_get_stats,
4669        .ndo_do_ioctl           = bond_do_ioctl,
4670        .ndo_change_rx_flags    = bond_change_rx_flags,
4671        .ndo_set_rx_mode        = bond_set_rx_mode,
4672        .ndo_change_mtu         = bond_change_mtu,
4673        .ndo_set_mac_address    = bond_set_mac_address,
4674        .ndo_neigh_setup        = bond_neigh_setup,
4675        .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4676        .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4677#ifdef CONFIG_NET_POLL_CONTROLLER
4678        .ndo_netpoll_setup      = bond_netpoll_setup,
4679        .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4680        .ndo_poll_controller    = bond_poll_controller,
4681#endif
4682        .ndo_add_slave          = bond_enslave,
4683        .ndo_del_slave          = bond_release,
4684        .ndo_fix_features       = bond_fix_features,
4685        .ndo_features_check     = passthru_features_check,
4686        .ndo_get_xmit_slave     = bond_xmit_get_slave,
4687};
4688
4689static const struct device_type bond_type = {
4690        .name = "bond",
4691};
4692
4693static void bond_destructor(struct net_device *bond_dev)
4694{
4695        struct bonding *bond = netdev_priv(bond_dev);
4696        if (bond->wq)
4697                destroy_workqueue(bond->wq);
4698}
4699
4700void bond_setup(struct net_device *bond_dev)
4701{
4702        struct bonding *bond = netdev_priv(bond_dev);
4703
4704        spin_lock_init(&bond->mode_lock);
4705        bond->params = bonding_defaults;
4706
4707        /* Initialize pointers */
4708        bond->dev = bond_dev;
4709
4710        /* Initialize the device entry points */
4711        ether_setup(bond_dev);
4712        bond_dev->max_mtu = ETH_MAX_MTU;
4713        bond_dev->netdev_ops = &bond_netdev_ops;
4714        bond_dev->ethtool_ops = &bond_ethtool_ops;
4715
4716        bond_dev->needs_free_netdev = true;
4717        bond_dev->priv_destructor = bond_destructor;
4718
4719        SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4720
4721        /* Initialize the device options */
4722        bond_dev->flags |= IFF_MASTER;
4723        bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4724        bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4725
4726#ifdef CONFIG_XFRM_OFFLOAD
4727        /* set up xfrm device ops (only supported in active-backup right now) */
4728        bond_dev->xfrmdev_ops = &bond_xfrmdev_ops;
4729        bond->xs = NULL;
4730#endif /* CONFIG_XFRM_OFFLOAD */
4731
4732        /* don't acquire bond device's netif_tx_lock when transmitting */
4733        bond_dev->features |= NETIF_F_LLTX;
4734
4735        /* By default, we declare the bond to be fully
4736         * VLAN hardware accelerated capable. Special
4737         * care is taken in the various xmit functions
4738         * when there are slaves that are not hw accel
4739         * capable
4740         */
4741
4742        /* Don't allow bond devices to change network namespaces. */
4743        bond_dev->features |= NETIF_F_NETNS_LOCAL;
4744
4745        bond_dev->hw_features = BOND_VLAN_FEATURES |
4746                                NETIF_F_HW_VLAN_CTAG_RX |
4747                                NETIF_F_HW_VLAN_CTAG_FILTER;
4748
4749        bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL | NETIF_F_GSO_UDP_L4;
4750#ifdef CONFIG_XFRM_OFFLOAD
4751        bond_dev->hw_features |= BOND_XFRM_FEATURES;
4752#endif /* CONFIG_XFRM_OFFLOAD */
4753        bond_dev->features |= bond_dev->hw_features;
4754        bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
4755#ifdef CONFIG_XFRM_OFFLOAD
4756        /* Disable XFRM features if this isn't an active-backup config */
4757        if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)
4758                bond_dev->features &= ~BOND_XFRM_FEATURES;
4759#endif /* CONFIG_XFRM_OFFLOAD */
4760}
4761
4762/* Destroy a bonding device.
4763 * Must be under rtnl_lock when this function is called.
4764 */
4765static void bond_uninit(struct net_device *bond_dev)
4766{
4767        struct bonding *bond = netdev_priv(bond_dev);
4768        struct bond_up_slave *usable, *all;
4769        struct list_head *iter;
4770        struct slave *slave;
4771
4772        bond_netpoll_cleanup(bond_dev);
4773
4774        /* Release the bonded slaves */
4775        bond_for_each_slave(bond, slave, iter)
4776                __bond_release_one(bond_dev, slave->dev, true, true);
4777        netdev_info(bond_dev, "Released all slaves\n");
4778
4779        usable = rtnl_dereference(bond->usable_slaves);
4780        if (usable) {
4781                RCU_INIT_POINTER(bond->usable_slaves, NULL);
4782                kfree_rcu(usable, rcu);
4783        }
4784
4785        all = rtnl_dereference(bond->all_slaves);
4786        if (all) {
4787                RCU_INIT_POINTER(bond->all_slaves, NULL);
4788                kfree_rcu(all, rcu);
4789        }
4790
4791        list_del(&bond->bond_list);
4792
4793        bond_debug_unregister(bond);
4794}
4795
4796/*------------------------- Module initialization ---------------------------*/
4797
4798static int bond_check_params(struct bond_params *params)
4799{
4800        int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4801        struct bond_opt_value newval;
4802        const struct bond_opt_value *valptr;
4803        int arp_all_targets_value = 0;
4804        u16 ad_actor_sys_prio = 0;
4805        u16 ad_user_port_key = 0;
4806        __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
4807        int arp_ip_count;
4808        int bond_mode   = BOND_MODE_ROUNDROBIN;
4809        int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
4810        int lacp_fast = 0;
4811        int tlb_dynamic_lb;
4812
4813        /* Convert string parameters. */
4814        if (mode) {
4815                bond_opt_initstr(&newval, mode);
4816                valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4817                if (!valptr) {
4818                        pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4819                        return -EINVAL;
4820                }
4821                bond_mode = valptr->value;
4822        }
4823
4824        if (xmit_hash_policy) {
4825                if (bond_mode == BOND_MODE_ROUNDROBIN ||
4826                    bond_mode == BOND_MODE_ACTIVEBACKUP ||
4827                    bond_mode == BOND_MODE_BROADCAST) {
4828                        pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4829                                bond_mode_name(bond_mode));
4830                } else {
4831                        bond_opt_initstr(&newval, xmit_hash_policy);
4832                        valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4833                                                &newval);
4834                        if (!valptr) {
4835                                pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4836                                       xmit_hash_policy);
4837                                return -EINVAL;
4838                        }
4839                        xmit_hashtype = valptr->value;
4840                }
4841        }
4842
4843        if (lacp_rate) {
4844                if (bond_mode != BOND_MODE_8023AD) {
4845                        pr_info("lacp_rate param is irrelevant in mode %s\n",
4846                                bond_mode_name(bond_mode));
4847                } else {
4848                        bond_opt_initstr(&newval, lacp_rate);
4849                        valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4850                                                &newval);
4851                        if (!valptr) {
4852                                pr_err("Error: Invalid lacp rate \"%s\"\n",
4853                                       lacp_rate);
4854                                return -EINVAL;
4855                        }
4856                        lacp_fast = valptr->value;
4857                }
4858        }
4859
4860        if (ad_select) {
4861                bond_opt_initstr(&newval, ad_select);
4862                valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4863                                        &newval);
4864                if (!valptr) {
4865                        pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4866                        return -EINVAL;
4867                }
4868                params->ad_select = valptr->value;
4869                if (bond_mode != BOND_MODE_8023AD)
4870                        pr_warn("ad_select param only affects 802.3ad mode\n");
4871        } else {
4872                params->ad_select = BOND_AD_STABLE;
4873        }
4874
4875        if (max_bonds < 0) {
4876                pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4877                        max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4878                max_bonds = BOND_DEFAULT_MAX_BONDS;
4879        }
4880
4881        if (miimon < 0) {
4882                pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4883                        miimon, INT_MAX);
4884                miimon = 0;
4885        }
4886
4887        if (updelay < 0) {
4888                pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4889                        updelay, INT_MAX);
4890                updelay = 0;
4891        }
4892
4893        if (downdelay < 0) {
4894                pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4895                        downdelay, INT_MAX);
4896                downdelay = 0;
4897        }
4898
4899        if ((use_carrier != 0) && (use_carrier != 1)) {
4900                pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4901                        use_carrier);
4902                use_carrier = 1;
4903        }
4904
4905        if (num_peer_notif < 0 || num_peer_notif > 255) {
4906                pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4907                        num_peer_notif);
4908                num_peer_notif = 1;
4909        }
4910
4911        /* reset values for 802.3ad/TLB/ALB */
4912        if (!bond_mode_uses_arp(bond_mode)) {
4913                if (!miimon) {
4914                        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");
4915                        pr_warn("Forcing miimon to 100msec\n");
4916                        miimon = BOND_DEFAULT_MIIMON;
4917                }
4918        }
4919
4920        if (tx_queues < 1 || tx_queues > 255) {
4921                pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4922                        tx_queues, BOND_DEFAULT_TX_QUEUES);
4923                tx_queues = BOND_DEFAULT_TX_QUEUES;
4924        }
4925
4926        if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4927                pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4928                        all_slaves_active);
4929                all_slaves_active = 0;
4930        }
4931
4932        if (resend_igmp < 0 || resend_igmp > 255) {
4933                pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4934                        resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4935                resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4936        }
4937
4938        bond_opt_initval(&newval, packets_per_slave);
4939        if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4940                pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4941                        packets_per_slave, USHRT_MAX);
4942                packets_per_slave = 1;
4943        }
4944
4945        if (bond_mode == BOND_MODE_ALB) {
4946                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",
4947                          updelay);
4948        }
4949
4950        if (!miimon) {
4951                if (updelay || downdelay) {
4952                        /* just warn the user the up/down delay will have
4953                         * no effect since miimon is zero...
4954                         */
4955                        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",
4956                                updelay, downdelay);
4957                }
4958        } else {
4959                /* don't allow arp monitoring */
4960                if (arp_interval) {
4961                        pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4962                                miimon, arp_interval);
4963                        arp_interval = 0;
4964                }
4965
4966                if ((updelay % miimon) != 0) {
4967                        pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4968                                updelay, miimon, (updelay / miimon) * miimon);
4969                }
4970
4971                updelay /= miimon;
4972
4973                if ((downdelay % miimon) != 0) {
4974                        pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4975                                downdelay, miimon,
4976                                (downdelay / miimon) * miimon);
4977                }
4978
4979                downdelay /= miimon;
4980        }
4981
4982        if (arp_interval < 0) {
4983                pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4984                        arp_interval, INT_MAX);
4985                arp_interval = 0;
4986        }
4987
4988        for (arp_ip_count = 0, i = 0;
4989             (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4990                __be32 ip;
4991
4992                /* not a complete check, but good enough to catch mistakes */
4993                if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4994                    !bond_is_ip_target_ok(ip)) {
4995                        pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4996                                arp_ip_target[i]);
4997                        arp_interval = 0;
4998                } else {
4999                        if (bond_get_targets_ip(arp_target, ip) == -1)
5000                                arp_target[arp_ip_count++] = ip;
5001                        else
5002                                pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
5003                                        &ip);
5004                }
5005        }
5006
5007        if (arp_interval && !arp_ip_count) {
5008                /* don't allow arping if no arp_ip_target given... */
5009                pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
5010                        arp_interval);
5011                arp_interval = 0;
5012        }
5013
5014        if (arp_validate) {
5015                if (!arp_interval) {
5016                        pr_err("arp_validate requires arp_interval\n");
5017                        return -EINVAL;
5018                }
5019
5020                bond_opt_initstr(&newval, arp_validate);
5021                valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
5022                                        &newval);
5023                if (!valptr) {
5024                        pr_err("Error: invalid arp_validate \"%s\"\n",
5025                               arp_validate);
5026                        return -EINVAL;
5027                }
5028                arp_validate_value = valptr->value;
5029        } else {
5030                arp_validate_value = 0;
5031        }
5032
5033        if (arp_all_targets) {
5034                bond_opt_initstr(&newval, arp_all_targets);
5035                valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
5036                                        &newval);
5037                if (!valptr) {
5038                        pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
5039                               arp_all_targets);
5040                        arp_all_targets_value = 0;
5041                } else {
5042                        arp_all_targets_value = valptr->value;
5043                }
5044        }
5045
5046        if (miimon) {
5047                pr_info("MII link monitoring set to %d ms\n", miimon);
5048        } else if (arp_interval) {
5049                valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
5050                                          arp_validate_value);
5051                pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
5052                        arp_interval, valptr->string, arp_ip_count);
5053
5054                for (i = 0; i < arp_ip_count; i++)
5055                        pr_cont(" %s", arp_ip_target[i]);
5056
5057                pr_cont("\n");
5058
5059        } else if (max_bonds) {
5060                /* miimon and arp_interval not set, we need one so things
5061                 * work as expected, see bonding.txt for details
5062                 */
5063                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");
5064        }
5065
5066        if (primary && !bond_mode_uses_primary(bond_mode)) {
5067                /* currently, using a primary only makes sense
5068                 * in active backup, TLB or ALB modes
5069                 */
5070                pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
5071                        primary, bond_mode_name(bond_mode));
5072                primary = NULL;
5073        }
5074
5075        if (primary && primary_reselect) {
5076                bond_opt_initstr(&newval, primary_reselect);
5077                valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
5078                                        &newval);
5079                if (!valptr) {
5080                        pr_err("Error: Invalid primary_reselect \"%s\"\n",
5081                               primary_reselect);
5082                        return -EINVAL;
5083                }
5084                primary_reselect_value = valptr->value;
5085        } else {
5086                primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
5087        }
5088
5089        if (fail_over_mac) {
5090                bond_opt_initstr(&newval, fail_over_mac);
5091                valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
5092                                        &newval);
5093                if (!valptr) {
5094                        pr_err("Error: invalid fail_over_mac \"%s\"\n",
5095                               fail_over_mac);
5096                        return -EINVAL;
5097                }
5098                fail_over_mac_value = valptr->value;
5099                if (bond_mode != BOND_MODE_ACTIVEBACKUP)
5100                        pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
5101        } else {
5102                fail_over_mac_value = BOND_FOM_NONE;
5103        }
5104
5105        bond_opt_initstr(&newval, "default");
5106        valptr = bond_opt_parse(
5107                        bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
5108                                     &newval);
5109        if (!valptr) {
5110                pr_err("Error: No ad_actor_sys_prio default value");
5111                return -EINVAL;
5112        }
5113        ad_actor_sys_prio = valptr->value;
5114
5115        valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
5116                                &newval);
5117        if (!valptr) {
5118                pr_err("Error: No ad_user_port_key default value");
5119                return -EINVAL;
5120        }
5121        ad_user_port_key = valptr->value;
5122
5123        bond_opt_initstr(&newval, "default");
5124        valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);
5125        if (!valptr) {
5126                pr_err("Error: No tlb_dynamic_lb default value");
5127                return -EINVAL;
5128        }
5129        tlb_dynamic_lb = valptr->value;
5130
5131        if (lp_interval == 0) {
5132                pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
5133                        INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
5134                lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
5135        }
5136
5137        /* fill params struct with the proper values */
5138        params->mode = bond_mode;
5139        params->xmit_policy = xmit_hashtype;
5140        params->miimon = miimon;
5141        params->num_peer_notif = num_peer_notif;
5142        params->arp_interval = arp_interval;
5143        params->arp_validate = arp_validate_value;
5144        params->arp_all_targets = arp_all_targets_value;
5145        params->updelay = updelay;
5146        params->downdelay = downdelay;
5147        params->peer_notif_delay = 0;
5148        params->use_carrier = use_carrier;
5149        params->lacp_fast = lacp_fast;
5150        params->primary[0] = 0;
5151        params->primary_reselect = primary_reselect_value;
5152        params->fail_over_mac = fail_over_mac_value;
5153        params->tx_queues = tx_queues;
5154        params->all_slaves_active = all_slaves_active;
5155        params->resend_igmp = resend_igmp;
5156        params->min_links = min_links;
5157        params->lp_interval = lp_interval;
5158        params->packets_per_slave = packets_per_slave;
5159        params->tlb_dynamic_lb = tlb_dynamic_lb;
5160        params->ad_actor_sys_prio = ad_actor_sys_prio;
5161        eth_zero_addr(params->ad_actor_system);
5162        params->ad_user_port_key = ad_user_port_key;
5163        if (packets_per_slave > 0) {
5164                params->reciprocal_packets_per_slave =
5165                        reciprocal_value(packets_per_slave);
5166        } else {
5167                /* reciprocal_packets_per_slave is unused if
5168                 * packets_per_slave is 0 or 1, just initialize it
5169                 */
5170                params->reciprocal_packets_per_slave =
5171                        (struct reciprocal_value) { 0 };
5172        }
5173
5174        if (primary) {
5175                strncpy(params->primary, primary, IFNAMSIZ);
5176                params->primary[IFNAMSIZ - 1] = 0;
5177        }
5178
5179        memcpy(params->arp_targets, arp_target, sizeof(arp_target));
5180
5181        return 0;
5182}
5183
5184/* Called from registration process */
5185static int bond_init(struct net_device *bond_dev)
5186{
5187        struct bonding *bond = netdev_priv(bond_dev);
5188        struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
5189
5190        netdev_dbg(bond_dev, "Begin bond_init\n");
5191
5192        bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
5193        if (!bond->wq)
5194                return -ENOMEM;
5195
5196        spin_lock_init(&bond->stats_lock);
5197        netdev_lockdep_set_classes(bond_dev);
5198
5199        list_add_tail(&bond->bond_list, &bn->dev_list);
5200
5201        bond_prepare_sysfs_group(bond);
5202
5203        bond_debug_register(bond);
5204
5205        /* Ensure valid dev_addr */
5206        if (is_zero_ether_addr(bond_dev->dev_addr) &&
5207            bond_dev->addr_assign_type == NET_ADDR_PERM)
5208                eth_hw_addr_random(bond_dev);