include/net/bonding.h

   1 /* SPDX-License-Identifier: GPL-1.0+ */
   2 /*
   3  * Bond several ethernet interfaces into a Cisco, running 'Etherchannel'.
   4  *
   5  * Portions are (c) Copyright 1995 Simon "Guru Aleph-Null" Janes
   6  * NCM: Network and Communications Management, Inc.
   7  *
   8  * BUT, I'm the one who modified it for ethernet, so:
   9  * (c) Copyright 1999, Thomas Davis, tadavis@lbl.gov
  10  *
  11  */
  12
  13 #ifndef _NET_BONDING_H
  14 #define _NET_BONDING_H
  15
  16 #include <linux/timer.h>
  17 #include <linux/proc_fs.h>
  18 #include <linux/if_bonding.h>
  19 #include <linux/cpumask.h>
  20 #include <linux/in6.h>
  21 #include <linux/netpoll.h>
  22 #include <linux/inetdevice.h>
  23 #include <linux/etherdevice.h>
  24 #include <linux/reciprocal_div.h>
  25 #include <linux/if_link.h>
  26
  27 #include <net/bond_3ad.h>
  28 #include <net/bond_alb.h>
  29 #include <net/bond_options.h>
  30 #include <net/ipv6.h>
  31 #include <net/addrconf.h>
  32
  33 #define BOND_MAX_ARP_TARGETS    16
  34 #define BOND_MAX_NS_TARGETS     BOND_MAX_ARP_TARGETS
  35
  36 #define BOND_DEFAULT_MIIMON     100
  37
  38 #ifndef __long_aligned
  39 #define __long_aligned __attribute__((aligned((sizeof(long)))))
  40 #endif
  41
  42 #define slave_info(bond_dev, slave_dev, fmt, ...) \
  43         netdev_info(bond_dev, "(slave %s): " fmt, (slave_dev)->name, ##__VA_ARGS__)
  44 #define slave_warn(bond_dev, slave_dev, fmt, ...) \
  45         netdev_warn(bond_dev, "(slave %s): " fmt, (slave_dev)->name, ##__VA_ARGS__)
  46 #define slave_dbg(bond_dev, slave_dev, fmt, ...) \
  47         netdev_dbg(bond_dev, "(slave %s): " fmt, (slave_dev)->name, ##__VA_ARGS__)
  48 #define slave_err(bond_dev, slave_dev, fmt, ...) \
  49         netdev_err(bond_dev, "(slave %s): " fmt, (slave_dev)->name, ##__VA_ARGS__)
  50
  51 #define BOND_MODE(bond) ((bond)->params.mode)
  52
  53 /* slave list primitives */
  54 #define bond_slave_list(bond) (&(bond)->dev->adj_list.lower)
  55
  56 #define bond_has_slaves(bond) !list_empty(bond_slave_list(bond))
  57
  58 /* IMPORTANT: bond_first/last_slave can return NULL in case of an empty list */
  59 #define bond_first_slave(bond) \
  60         (bond_has_slaves(bond) ? \
  61                 netdev_adjacent_get_private(bond_slave_list(bond)->next) : \
  62                 NULL)
  63 #define bond_last_slave(bond) \
  64         (bond_has_slaves(bond) ? \
  65                 netdev_adjacent_get_private(bond_slave_list(bond)->prev) : \
  66                 NULL)
  67
  68 /* Caller must have rcu_read_lock */
  69 #define bond_first_slave_rcu(bond) \
  70         netdev_lower_get_first_private_rcu(bond->dev)
  71
  72 #define bond_is_first_slave(bond, pos) (pos == bond_first_slave(bond))
  73 #define bond_is_last_slave(bond, pos) (pos == bond_last_slave(bond))
  74
  75 /**
  76  * bond_for_each_slave - iterate over all slaves
  77  * @bond:       the bond holding this list
  78  * @pos:        current slave
  79  * @iter:       list_head * iterator
  80  *
  81  * Caller must hold RTNL
  82  */
  83 #define bond_for_each_slave(bond, pos, iter) \
  84         netdev_for_each_lower_private((bond)->dev, pos, iter)
  85
  86 /* Caller must have rcu_read_lock */
  87 #define bond_for_each_slave_rcu(bond, pos, iter) \
  88         netdev_for_each_lower_private_rcu((bond)->dev, pos, iter)
  89
  90 #define BOND_XFRM_FEATURES (NETIF_F_HW_ESP | NETIF_F_HW_ESP_TX_CSUM | \
  91                             NETIF_F_GSO_ESP)
  92
  93 #ifdef CONFIG_NET_POLL_CONTROLLER
  94 extern atomic_t netpoll_block_tx;
  95
  96 static inline void block_netpoll_tx(void)
  97 {
  98         atomic_inc(&netpoll_block_tx);
  99 }
 100
 101 static inline void unblock_netpoll_tx(void)
 102 {
 103         atomic_dec(&netpoll_block_tx);
 104 }
 105
 106 static inline int is_netpoll_tx_blocked(struct net_device *dev)
 107 {
 108         if (unlikely(netpoll_tx_running(dev)))
 109                 return atomic_read(&netpoll_block_tx);
 110         return 0;
 111 }
 112 #else
 113 #define block_netpoll_tx()
 114 #define unblock_netpoll_tx()
 115 #define is_netpoll_tx_blocked(dev) (0)
 116 #endif
 117
 118 struct bond_params {
 119         int mode;
 120         int xmit_policy;
 121         int miimon;
 122         u8 num_peer_notif;
 123         u8 missed_max;
 124         int arp_interval;
 125         int arp_validate;
 126         int arp_all_targets;
 127         int use_carrier;
 128         int fail_over_mac;
 129         int updelay;
 130         int downdelay;
 131         int peer_notif_delay;
 132         int lacp_active;
 133         int lacp_fast;
 134         unsigned int min_links;
 135         int ad_select;
 136         char primary[IFNAMSIZ];
 137         int primary_reselect;
 138         __be32 arp_targets[BOND_MAX_ARP_TARGETS];
 139         int tx_queues;
 140         int all_slaves_active;
 141         int resend_igmp;
 142         int lp_interval;
 143         int packets_per_slave;
 144         int tlb_dynamic_lb;
 145         struct reciprocal_value reciprocal_packets_per_slave;
 146         u16 ad_actor_sys_prio;
 147         u16 ad_user_port_key;
 148 #if IS_ENABLED(CONFIG_IPV6)
 149         struct in6_addr ns_targets[BOND_MAX_NS_TARGETS];
 150 #endif
 151         int coupled_control;
 152
 153         /* 2 bytes of padding : see ether_addr_equal_64bits() */
 154         u8 ad_actor_system[ETH_ALEN + 2];
 155 };
 156
 157 struct slave {
 158         struct net_device *dev; /* first - useful for panic debug */
 159         struct bonding *bond; /* our master */
 160         int    delay;
 161         /* all 4 in jiffies */
 162         unsigned long last_link_up;
 163         unsigned long last_tx;
 164         unsigned long last_rx;
 165         unsigned long target_last_arp_rx[BOND_MAX_ARP_TARGETS];
 166         s8     link;            /* one of BOND_LINK_XXXX */
 167         s8     link_new_state;  /* one of BOND_LINK_XXXX */
 168         u8     backup:1,   /* indicates backup slave. Value corresponds with
 169                               BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
 170                inactive:1, /* indicates inactive slave */
 171                rx_disabled:1, /* indicates whether slave's Rx is disabled */
 172                should_notify:1, /* indicates whether the state changed */
 173                should_notify_link:1; /* indicates whether the link changed */
 174         u8     duplex;
 175         u32    original_mtu;
 176         u32    link_failure_count;
 177         u32    speed;
 178         u16    queue_id;
 179         u8     perm_hwaddr[MAX_ADDR_LEN];
 180         int    prio;
 181         struct ad_slave_info *ad_info;
 182         struct tlb_slave_info tlb_info;
 183 #ifdef CONFIG_NET_POLL_CONTROLLER
 184         struct netpoll *np;
 185 #endif
 186         struct delayed_work notify_work;
 187         struct kobject kobj;
 188         struct rtnl_link_stats64 slave_stats;
 189 };
 190
 191 static inline struct slave *to_slave(struct kobject *kobj)
 192 {
 193         return container_of(kobj, struct slave, kobj);
 194 }
 195
 196 struct bond_up_slave {
 197         unsigned int    count;
 198         struct rcu_head rcu;
 199         struct slave    *arr[];
 200 };
 201
 202 /*
 203  * Link pseudo-state only used internally by monitors
 204  */
 205 #define BOND_LINK_NOCHANGE -1
 206
 207 struct bond_ipsec {
 208         struct list_head list;
 209         struct xfrm_state *xs;
 210 };
 211
 212 /*
 213  * Here are the locking policies for the two bonding locks:
 214  * Get rcu_read_lock when reading or RTNL when writing slave list.
 215  */
 216 struct bonding {
 217         struct   net_device *dev; /* first - useful for panic debug */
 218         struct   slave __rcu *curr_active_slave;
 219         struct   slave __rcu *current_arp_slave;
 220         struct   slave __rcu *primary_slave;
 221         struct   bond_up_slave __rcu *usable_slaves;
 222         struct   bond_up_slave __rcu *all_slaves;
 223         bool     force_primary;
 224         bool     notifier_ctx;
 225         s32      slave_cnt; /* never change this value outside the attach/detach wrappers */
 226         int     (*recv_probe)(const struct sk_buff *, struct bonding *,
 227                               struct slave *);
 228         /* mode_lock is used for mode-specific locking needs, currently used by:
 229          * 3ad mode (4) - protect against running bond_3ad_unbind_slave() and
 230          *                bond_3ad_state_machine_handler() concurrently and also
 231          *                the access to the state machine shared variables.
 232          * TLB mode (5) - to sync the use and modifications of its hash table
 233          * ALB mode (6) - to sync the use and modifications of its hash table
 234          */
 235         spinlock_t mode_lock;
 236         spinlock_t stats_lock;
 237         u32      send_peer_notif;
 238         u8       igmp_retrans;
 239 #ifdef CONFIG_PROC_FS
 240         struct   proc_dir_entry *proc_entry;
 241         char     proc_file_name[IFNAMSIZ];
 242 #endif /* CONFIG_PROC_FS */
 243         struct   list_head bond_list;
 244         u32 __percpu *rr_tx_counter;
 245         struct   ad_bond_info ad_info;
 246         struct   alb_bond_info alb_info;
 247         struct   bond_params params;
 248         struct   workqueue_struct *wq;
 249         struct   delayed_work mii_work;
 250         struct   delayed_work arp_work;
 251         struct   delayed_work alb_work;
 252         struct   delayed_work ad_work;
 253         struct   delayed_work mcast_work;
 254         struct   delayed_work slave_arr_work;
 255 #ifdef CONFIG_DEBUG_FS
 256         /* debugging support via debugfs */
 257         struct   dentry *debug_dir;
 258 #endif /* CONFIG_DEBUG_FS */
 259         struct rtnl_link_stats64 bond_stats;
 260 #ifdef CONFIG_XFRM_OFFLOAD
 261         struct list_head ipsec_list;
 262         /* protecting ipsec_list */
 263         struct mutex ipsec_lock;
 264 #endif /* CONFIG_XFRM_OFFLOAD */
 265         struct bpf_prog *xdp_prog;
 266 };
 267
 268 #define bond_slave_get_rcu(dev) \
 269         ((struct slave *) rcu_dereference(dev->rx_handler_data))
 270
 271 #define bond_slave_get_rtnl(dev) \
 272         ((struct slave *) rtnl_dereference(dev->rx_handler_data))
 273
 274 void bond_queue_slave_event(struct slave *slave);
 275 void bond_lower_state_changed(struct slave *slave);
 276
 277 struct bond_vlan_tag {
 278         __be16          vlan_proto;
 279         unsigned short  vlan_id;
 280 };
 281
 282 /*
 283  * Returns NULL if the net_device does not belong to any of the bond's slaves
 284  *
 285  * Caller must hold bond lock for read
 286  */
 287 static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
 288                                                   struct net_device *slave_dev)
 289 {
 290         return netdev_lower_dev_get_private(bond->dev, slave_dev);
 291 }
 292
 293 static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
 294 {
 295         return slave->bond;
 296 }
 297
 298 static inline bool bond_should_override_tx_queue(struct bonding *bond)
 299 {
 300         return BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
 301                BOND_MODE(bond) == BOND_MODE_ROUNDROBIN;
 302 }
 303
 304 static inline bool bond_is_lb(const struct bonding *bond)
 305 {
 306         return BOND_MODE(bond) == BOND_MODE_TLB ||
 307                BOND_MODE(bond) == BOND_MODE_ALB;
 308 }
 309
 310 static inline bool bond_needs_speed_duplex(const struct bonding *bond)
 311 {
 312         return BOND_MODE(bond) == BOND_MODE_8023AD || bond_is_lb(bond);
 313 }
 314
 315 static inline bool bond_is_nondyn_tlb(const struct bonding *bond)
 316 {
 317         return (bond_is_lb(bond) && bond->params.tlb_dynamic_lb == 0);
 318 }
 319
 320 static inline bool bond_mode_can_use_xmit_hash(const struct bonding *bond)
 321 {
 322         return (BOND_MODE(bond) == BOND_MODE_8023AD ||
 323                 BOND_MODE(bond) == BOND_MODE_XOR ||
 324                 BOND_MODE(bond) == BOND_MODE_TLB ||
 325                 BOND_MODE(bond) == BOND_MODE_ALB);
 326 }
 327
 328 static inline bool bond_mode_uses_xmit_hash(const struct bonding *bond)
 329 {
 330         return (BOND_MODE(bond) == BOND_MODE_8023AD ||
 331                 BOND_MODE(bond) == BOND_MODE_XOR ||
 332                 bond_is_nondyn_tlb(bond));
 333 }
 334
 335 static inline bool bond_mode_uses_arp(int mode)
 336 {
 337         return mode != BOND_MODE_8023AD && mode != BOND_MODE_TLB &&
 338                mode != BOND_MODE_ALB;
 339 }
 340
 341 static inline bool bond_mode_uses_primary(int mode)
 342 {
 343         return mode == BOND_MODE_ACTIVEBACKUP || mode == BOND_MODE_TLB ||
 344                mode == BOND_MODE_ALB;
 345 }
 346
 347 static inline bool bond_uses_primary(struct bonding *bond)
 348 {
 349         return bond_mode_uses_primary(BOND_MODE(bond));
 350 }
 351
 352 static inline struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond)
 353 {
 354         struct slave *slave = rcu_dereference_rtnl(bond->curr_active_slave);
 355
 356         return bond_uses_primary(bond) && slave ? slave->dev : NULL;
 357 }
 358
 359 static inline bool bond_slave_is_up(struct slave *slave)
 360 {
 361         return netif_running(slave->dev) && netif_carrier_ok(slave->dev);
 362 }
 363
 364 static inline void bond_set_active_slave(struct slave *slave)
 365 {
 366         if (slave->backup) {
 367                 slave->backup = 0;
 368                 bond_queue_slave_event(slave);
 369                 bond_lower_state_changed(slave);
 370         }
 371 }
 372
 373 static inline void bond_set_backup_slave(struct slave *slave)
 374 {
 375         if (!slave->backup) {
 376                 slave->backup = 1;
 377                 bond_queue_slave_event(slave);
 378                 bond_lower_state_changed(slave);
 379         }
 380 }
 381
 382 static inline void bond_set_slave_state(struct slave *slave,
 383                                         int slave_state, bool notify)
 384 {
 385         if (slave->backup == slave_state)
 386                 return;
 387
 388         slave->backup = slave_state;
 389         if (notify) {
 390                 bond_lower_state_changed(slave);
 391                 bond_queue_slave_event(slave);
 392                 slave->should_notify = 0;
 393         } else {
 394                 if (slave->should_notify)
 395                         slave->should_notify = 0;
 396                 else
 397                         slave->should_notify = 1;
 398         }
 399 }
 400
 401 static inline void bond_slave_state_change(struct bonding *bond)
 402 {
 403         struct list_head *iter;
 404         struct slave *tmp;
 405
 406         bond_for_each_slave(bond, tmp, iter) {
 407                 if (tmp->link == BOND_LINK_UP)
 408                         bond_set_active_slave(tmp);
 409                 else if (tmp->link == BOND_LINK_DOWN)
 410                         bond_set_backup_slave(tmp);
 411         }
 412 }
 413
 414 static inline void bond_slave_state_notify(struct bonding *bond)
 415 {
 416         struct list_head *iter;
 417         struct slave *tmp;
 418
 419         bond_for_each_slave(bond, tmp, iter) {
 420                 if (tmp->should_notify) {
 421                         bond_lower_state_changed(tmp);
 422                         tmp->should_notify = 0;
 423                 }
 424         }
 425 }
 426
 427 static inline int bond_slave_state(struct slave *slave)
 428 {
 429         return slave->backup;
 430 }
 431
 432 static inline bool bond_is_active_slave(struct slave *slave)
 433 {
 434         return !bond_slave_state(slave);
 435 }
 436
 437 static inline bool bond_slave_can_tx(struct slave *slave)
 438 {
 439         return bond_slave_is_up(slave) && slave->link == BOND_LINK_UP &&
 440                bond_is_active_slave(slave);
 441 }
 442
 443 static inline bool bond_is_active_slave_dev(const struct net_device *slave_dev)
 444 {
 445         struct slave *slave;
 446         bool active;
 447
 448         rcu_read_lock();
 449         slave = bond_slave_get_rcu(slave_dev);
 450         active = bond_is_active_slave(slave);
 451         rcu_read_unlock();
 452
 453         return active;
 454 }
 455
 456 static inline void bond_hw_addr_copy(u8 *dst, const u8 *src, unsigned int len)
 457 {
 458         if (len == ETH_ALEN) {
 459                 ether_addr_copy(dst, src);
 460                 return;
 461         }
 462
 463         memcpy(dst, src, len);
 464 }
 465
 466 #define BOND_PRI_RESELECT_ALWAYS        0
 467 #define BOND_PRI_RESELECT_BETTER        1
 468 #define BOND_PRI_RESELECT_FAILURE       2
 469
 470 #define BOND_FOM_NONE                   0
 471 #define BOND_FOM_ACTIVE                 1
 472 #define BOND_FOM_FOLLOW                 2
 473
 474 #define BOND_ARP_TARGETS_ANY            0
 475 #define BOND_ARP_TARGETS_ALL            1
 476
 477 #define BOND_ARP_VALIDATE_NONE          0
 478 #define BOND_ARP_VALIDATE_ACTIVE        (1 << BOND_STATE_ACTIVE)
 479 #define BOND_ARP_VALIDATE_BACKUP        (1 << BOND_STATE_BACKUP)
 480 #define BOND_ARP_VALIDATE_ALL           (BOND_ARP_VALIDATE_ACTIVE | \
 481                                          BOND_ARP_VALIDATE_BACKUP)
 482 #define BOND_ARP_FILTER                 (BOND_ARP_VALIDATE_ALL + 1)
 483 #define BOND_ARP_FILTER_ACTIVE          (BOND_ARP_VALIDATE_ACTIVE | \
 484                                          BOND_ARP_FILTER)
 485 #define BOND_ARP_FILTER_BACKUP          (BOND_ARP_VALIDATE_BACKUP | \
 486                                          BOND_ARP_FILTER)
 487
 488 #define BOND_SLAVE_NOTIFY_NOW           true
 489 #define BOND_SLAVE_NOTIFY_LATER         false
 490
 491 static inline int slave_do_arp_validate(struct bonding *bond,
 492                                         struct slave *slave)
 493 {
 494         return bond->params.arp_validate & (1 << bond_slave_state(slave));
 495 }
 496
 497 static inline int slave_do_arp_validate_only(struct bonding *bond)
 498 {
 499         return bond->params.arp_validate & BOND_ARP_FILTER;
 500 }
 501
 502 static inline int bond_is_ip_target_ok(__be32 addr)
 503 {
 504         return !ipv4_is_lbcast(addr) && !ipv4_is_zeronet(addr);
 505 }
 506
 507 #if IS_ENABLED(CONFIG_IPV6)
 508 static inline int bond_is_ip6_target_ok(struct in6_addr *addr)
 509 {
 510         return !ipv6_addr_any(addr) &&
 511                !ipv6_addr_loopback(addr) &&
 512                !ipv6_addr_is_multicast(addr);
 513 }
 514 #endif
 515
 516 /* Get the oldest arp which we've received on this slave for bond's
 517  * arp_targets.
 518  */
 519 static inline unsigned long slave_oldest_target_arp_rx(struct bonding *bond,
 520                                                        struct slave *slave)
 521 {
 522         int i = 1;
 523         unsigned long ret = slave->target_last_arp_rx[0];
 524
 525         for (; (i < BOND_MAX_ARP_TARGETS) && bond->params.arp_targets[i]; i++)
 526                 if (time_before(slave->target_last_arp_rx[i], ret))
 527                         ret = slave->target_last_arp_rx[i];
 528
 529         return ret;
 530 }
 531
 532 static inline unsigned long slave_last_rx(struct bonding *bond,
 533                                         struct slave *slave)
 534 {
 535         if (bond->params.arp_all_targets == BOND_ARP_TARGETS_ALL)
 536                 return slave_oldest_target_arp_rx(bond, slave);
 537
 538         return slave->last_rx;
 539 }
 540
 541 static inline void slave_update_last_tx(struct slave *slave)
 542 {
 543         WRITE_ONCE(slave->last_tx, jiffies);
 544 }
 545
 546 static inline unsigned long slave_last_tx(struct slave *slave)
 547 {
 548         return READ_ONCE(slave->last_tx);
 549 }
 550
 551 #ifdef CONFIG_NET_POLL_CONTROLLER
 552 static inline netdev_tx_t bond_netpoll_send_skb(const struct slave *slave,
 553                                          struct sk_buff *skb)
 554 {
 555         return netpoll_send_skb(slave->np, skb);
 556 }
 557 #else
 558 static inline netdev_tx_t bond_netpoll_send_skb(const struct slave *slave,
 559                                          struct sk_buff *skb)
 560 {
 561         BUG();
 562         return NETDEV_TX_OK;
 563 }
 564 #endif
 565
 566 static inline void bond_set_slave_inactive_flags(struct slave *slave,
 567                                                  bool notify)
 568 {
 569         if (!bond_is_lb(slave->bond))
 570                 bond_set_slave_state(slave, BOND_STATE_BACKUP, notify);
 571         if (!slave->bond->params.all_slaves_active)
 572                 slave->inactive = 1;
 573         if (BOND_MODE(slave->bond) == BOND_MODE_8023AD)
 574                 slave->rx_disabled = 1;
 575 }
 576
 577 static inline void bond_set_slave_tx_disabled_flags(struct slave *slave,
 578                                                  bool notify)
 579 {
 580         bond_set_slave_state(slave, BOND_STATE_BACKUP, notify);
 581 }
 582
 583 static inline void bond_set_slave_active_flags(struct slave *slave,
 584                                                bool notify)
 585 {
 586         bond_set_slave_state(slave, BOND_STATE_ACTIVE, notify);
 587         slave->inactive = 0;
 588         if (BOND_MODE(slave->bond) == BOND_MODE_8023AD)
 589                 slave->rx_disabled = 0;
 590 }
 591
 592 static inline void bond_set_slave_rx_enabled_flags(struct slave *slave,
 593                                                bool notify)
 594 {
 595         slave->rx_disabled = 0;
 596 }
 597
 598 static inline bool bond_is_slave_inactive(struct slave *slave)
 599 {
 600         return slave->inactive;
 601 }
 602
 603 static inline bool bond_is_slave_rx_disabled(struct slave *slave)
 604 {
 605         return slave->rx_disabled;
 606 }
 607
 608 static inline void bond_propose_link_state(struct slave *slave, int state)
 609 {
 610         slave->link_new_state = state;
 611 }
 612
 613 static inline void bond_commit_link_state(struct slave *slave, bool notify)
 614 {
 615         if (slave->link_new_state == BOND_LINK_NOCHANGE)
 616                 return;
 617
 618         slave->link = slave->link_new_state;
 619         if (notify) {
 620                 bond_queue_slave_event(slave);
 621                 bond_lower_state_changed(slave);
 622                 slave->should_notify_link = 0;
 623         } else {
 624                 if (slave->should_notify_link)
 625                         slave->should_notify_link = 0;
 626                 else
 627                         slave->should_notify_link = 1;
 628         }
 629 }
 630
 631 static inline void bond_set_slave_link_state(struct slave *slave, int state,
 632                                              bool notify)
 633 {
 634         bond_propose_link_state(slave, state);
 635         bond_commit_link_state(slave, notify);
 636 }
 637
 638 static inline void bond_slave_link_notify(struct bonding *bond)
 639 {
 640         struct list_head *iter;
 641         struct slave *tmp;
 642
 643         bond_for_each_slave(bond, tmp, iter) {
 644                 if (tmp->should_notify_link) {
 645                         bond_queue_slave_event(tmp);
 646                         bond_lower_state_changed(tmp);
 647                         tmp->should_notify_link = 0;
 648                 }
 649         }
 650 }
 651
 652 static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)
 653 {
 654         struct in_device *in_dev;
 655         __be32 addr = 0;
 656
 657         rcu_read_lock();
 658         in_dev = __in_dev_get_rcu(dev);
 659
 660         if (in_dev)
 661                 addr = inet_confirm_addr(dev_net(dev), in_dev, dst, local,
 662                                          RT_SCOPE_HOST);
 663         rcu_read_unlock();
 664         return addr;
 665 }
 666
 667 struct bond_net {
 668         struct net              *net;   /* Associated network namespace */
 669         struct list_head        dev_list;
 670 #ifdef CONFIG_PROC_FS
 671         struct proc_dir_entry   *proc_dir;
 672 #endif
 673         struct class_attribute  class_attr_bonding_masters;
 674 };
 675
 676 int bond_rcv_validate(const struct sk_buff *skb, struct bonding *bond, struct slave *slave);
 677 netdev_tx_t bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
 678 int bond_create(struct net *net, const char *name);
 679 int bond_create_sysfs(struct bond_net *net);
 680 void bond_destroy_sysfs(struct bond_net *net);
 681 void bond_prepare_sysfs_group(struct bonding *bond);
 682 int bond_sysfs_slave_add(struct slave *slave);
 683 void bond_sysfs_slave_del(struct slave *slave);
 684 void bond_xdp_set_features(struct net_device *bond_dev);
 685 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
 686                  struct netlink_ext_ack *extack);
 687 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
 688 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb);
 689 int bond_set_carrier(struct bonding *bond);
 690 void bond_select_active_slave(struct bonding *bond);
 691 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
 692 void bond_create_debugfs(void);
 693 void bond_destroy_debugfs(void);
 694 void bond_debug_register(struct bonding *bond);
 695 void bond_debug_unregister(struct bonding *bond);
 696 void bond_debug_reregister(struct bonding *bond);
 697 const char *bond_mode_name(int mode);
 698 void bond_setup(struct net_device *bond_dev);
 699 unsigned int bond_get_num_tx_queues(void);
 700 int bond_netlink_init(void);
 701 void bond_netlink_fini(void);
 702 struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond);
 703 const char *bond_slave_link_status(s8 link);
 704 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
 705                                               struct net_device *end_dev,
 706                                               int level);
 707 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave);
 708 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay);
 709 void bond_work_init_all(struct bonding *bond);
 710
 711 #ifdef CONFIG_PROC_FS
 712 void bond_create_proc_entry(struct bonding *bond);
 713 void bond_remove_proc_entry(struct bonding *bond);
 714 void bond_create_proc_dir(struct bond_net *bn);
 715 void bond_destroy_proc_dir(struct bond_net *bn);
 716 #else
 717 static inline void bond_create_proc_entry(struct bonding *bond)
 718 {
 719 }
 720
 721 static inline void bond_remove_proc_entry(struct bonding *bond)
 722 {
 723 }
 724
 725 static inline void bond_create_proc_dir(struct bond_net *bn)
 726 {
 727 }
 728
 729 static inline void bond_destroy_proc_dir(struct bond_net *bn)
 730 {
 731 }
 732 #endif
 733
 734 static inline struct slave *bond_slave_has_mac(struct bonding *bond,
 735                                                const u8 *mac)
 736 {
 737         struct list_head *iter;
 738         struct slave *tmp;
 739
 740         bond_for_each_slave(bond, tmp, iter)
 741                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 742                         return tmp;
 743
 744         return NULL;
 745 }
 746
 747 /* Caller must hold rcu_read_lock() for read */
 748 static inline bool bond_slave_has_mac_rcu(struct bonding *bond, const u8 *mac)
 749 {
 750         struct list_head *iter;
 751         struct slave *tmp;
 752
 753         bond_for_each_slave_rcu(bond, tmp, iter)
 754                 if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
 755                         return true;
 756         return false;
 757 }
 758
 759 /* Check if the ip is present in arp ip list, or first free slot if ip == 0
 760  * Returns -1 if not found, index if found
 761  */
 762 static inline int bond_get_targets_ip(__be32 *targets, __be32 ip)
 763 {
 764         int i;
 765
 766         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
 767                 if (targets[i] == ip)
 768                         return i;
 769                 else if (targets[i] == 0)
 770                         break;
 771
 772         return -1;
 773 }
 774
 775 #if IS_ENABLED(CONFIG_IPV6)
 776 static inline int bond_get_targets_ip6(struct in6_addr *targets, struct in6_addr *ip)
 777 {
 778         struct in6_addr mcaddr;
 779         int i;
 780
 781         for (i = 0; i < BOND_MAX_NS_TARGETS; i++) {
 782                 addrconf_addr_solict_mult(&targets[i], &mcaddr);
 783                 if ((ipv6_addr_equal(&targets[i], ip)) ||
 784                     (ipv6_addr_equal(&mcaddr, ip)))
 785                         return i;
 786                 else if (ipv6_addr_any(&targets[i]))
 787                         break;
 788         }
 789
 790         return -1;
 791 }
 792 #endif
 793
 794 /* exported from bond_main.c */
 795 extern unsigned int bond_net_id;
 796
 797 /* exported from bond_netlink.c */
 798 extern struct rtnl_link_ops bond_link_ops;
 799
 800 /* exported from bond_sysfs_slave.c */
 801 extern const struct sysfs_ops slave_sysfs_ops;
 802
 803 /* exported from bond_3ad.c */
 804 extern const u8 lacpdu_mcast_addr[];
 805
 806 static inline netdev_tx_t bond_tx_drop(struct net_device *dev, struct sk_buff *skb)
 807 {
 808         dev_core_stats_tx_dropped_inc(dev);
 809         dev_kfree_skb_any(skb);
 810         return NET_XMIT_DROP;
 811 }
 812
 813 #endif /* _NET_BONDING_H */