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