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_keys.h> 80 #include "bonding.h" 81 #include "bond_3ad.h" 82 #include "bond_alb.h" 83 84 /*---------------------------- Module parameters ----------------------------*/ 85 86 /* monitor all links that often (in milliseconds). <=0 disables monitoring */ 87 88 static int max_bonds = BOND_DEFAULT_MAX_BONDS; 89 static int tx_queues = BOND_DEFAULT_TX_QUEUES; 90 static int num_peer_notif = 1; 91 static int miimon; 92 static int updelay; 93 static int downdelay; 94 static int use_carrier = 1; 95 static char *mode; 96 static char *primary; 97 static char *primary_reselect; 98 static char *lacp_rate; 99 static int min_links; 100 static char *ad_select; 101 static char *xmit_hash_policy; 102 static int arp_interval; 103 static char *arp_ip_target[BOND_MAX_ARP_TARGETS]; 104 static char *arp_validate; 105 static char *arp_all_targets; 106 static char *fail_over_mac; 107 static int all_slaves_active; 108 static struct bond_params bonding_defaults; 109 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP; 110 static int packets_per_slave = 1; 111 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 112 113 module_param(max_bonds, int, 0); 114 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices"); 115 module_param(tx_queues, int, 0); 116 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)"); 117 module_param_named(num_grat_arp, num_peer_notif, int, 0644); 118 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on " 119 "failover event (alias of num_unsol_na)"); 120 module_param_named(num_unsol_na, num_peer_notif, int, 0644); 121 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on " 122 "failover event (alias of num_grat_arp)"); 123 module_param(miimon, int, 0); 124 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds"); 125 module_param(updelay, int, 0); 126 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds"); 127 module_param(downdelay, int, 0); 128 MODULE_PARM_DESC(downdelay, "Delay before considering link down, " 129 "in milliseconds"); 130 module_param(use_carrier, int, 0); 131 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; " 132 "0 for off, 1 for on (default)"); 133 module_param(mode, charp, 0); 134 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, " 135 "1 for active-backup, 2 for balance-xor, " 136 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, " 137 "6 for balance-alb"); 138 module_param(primary, charp, 0); 139 MODULE_PARM_DESC(primary, "Primary network device to use"); 140 module_param(primary_reselect, charp, 0); 141 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave " 142 "once it comes up; " 143 "0 for always (default), " 144 "1 for only if speed of primary is " 145 "better, " 146 "2 for only on active slave " 147 "failure"); 148 module_param(lacp_rate, charp, 0); 149 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; " 150 "0 for slow, 1 for fast"); 151 module_param(ad_select, charp, 0); 152 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; " 153 "0 for stable (default), 1 for bandwidth, " 154 "2 for count"); 155 module_param(min_links, int, 0); 156 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier"); 157 158 module_param(xmit_hash_policy, charp, 0); 159 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; " 160 "0 for layer 2 (default), 1 for layer 3+4, " 161 "2 for layer 2+3, 3 for encap layer 2+3, " 162 "4 for encap layer 3+4"); 163 module_param(arp_interval, int, 0); 164 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds"); 165 module_param_array(arp_ip_target, charp, NULL, 0); 166 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form"); 167 module_param(arp_validate, charp, 0); 168 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; " 169 "0 for none (default), 1 for active, " 170 "2 for backup, 3 for all"); 171 module_param(arp_all_targets, charp, 0); 172 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all"); 173 module_param(fail_over_mac, charp, 0); 174 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to " 175 "the same MAC; 0 for none (default), " 176 "1 for active, 2 for follow"); 177 module_param(all_slaves_active, int, 0); 178 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface " 179 "by setting active flag for all slaves; " 180 "0 for never (default), 1 for always."); 181 module_param(resend_igmp, int, 0); 182 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on " 183 "link failure"); 184 module_param(packets_per_slave, int, 0); 185 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr " 186 "mode; 0 for a random slave, 1 packet per " 187 "slave (default), >1 packets per slave."); 188 module_param(lp_interval, uint, 0); 189 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where " 190 "the bonding driver sends learning packets to " 191 "each slaves peer switch. The default is 1."); 192 193 /*----------------------------- Global variables ----------------------------*/ 194 195 #ifdef CONFIG_NET_POLL_CONTROLLER 196 atomic_t netpoll_block_tx = ATOMIC_INIT(0); 197 #endif 198 199 int bond_net_id __read_mostly; 200 201 static __be32 arp_target[BOND_MAX_ARP_TARGETS]; 202 static int arp_ip_count; 203 static int bond_mode = BOND_MODE_ROUNDROBIN; 204 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2; 205 static int lacp_fast; 206 207 /*-------------------------- Forward declarations ---------------------------*/ 208 209 static int bond_init(struct net_device *bond_dev); 210 static void bond_uninit(struct net_device *bond_dev); 211 212 /*---------------------------- General routines -----------------------------*/ 213 214 const char *bond_mode_name(int mode) 215 { 216 static const char *names[] = { 217 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)", 218 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)", 219 [BOND_MODE_XOR] = "load balancing (xor)", 220 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)", 221 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation", 222 [BOND_MODE_TLB] = "transmit load balancing", 223 [BOND_MODE_ALB] = "adaptive load balancing", 224 }; 225 226 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB) 227 return "unknown"; 228 229 return names[mode]; 230 } 231 232 /*---------------------------------- VLAN -----------------------------------*/ 233 234 /** 235 * bond_dev_queue_xmit - Prepare skb for xmit. 236 * 237 * @bond: bond device that got this skb for tx. 238 * @skb: hw accel VLAN tagged skb to transmit 239 * @slave_dev: slave that is supposed to xmit this skbuff 240 */ 241 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, 242 struct net_device *slave_dev) 243 { 244 skb->dev = slave_dev; 245 246 BUILD_BUG_ON(sizeof(skb->queue_mapping) != 247 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping)); 248 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping; 249 250 if (unlikely(netpoll_tx_running(bond->dev))) 251 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb); 252 else 253 dev_queue_xmit(skb); 254 } 255 256 /* 257 * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid, 258 * We don't protect the slave list iteration with a lock because: 259 * a. This operation is performed in IOCTL context, 260 * b. The operation is protected by the RTNL semaphore in the 8021q code, 261 * c. Holding a lock with BH disabled while directly calling a base driver 262 * entry point is generally a BAD idea. 263 * 264 * The design of synchronization/protection for this operation in the 8021q 265 * module is good for one or more VLAN devices over a single physical device 266 * and cannot be extended for a teaming solution like bonding, so there is a 267 * potential race condition here where a net device from the vlan group might 268 * be referenced (either by a base driver or the 8021q code) while it is being 269 * removed from the system. However, it turns out we're not making matters 270 * worse, and if it works for regular VLAN usage it will work here too. 271 */ 272 273 /** 274 * bond_vlan_rx_add_vid - Propagates adding an id to slaves 275 * @bond_dev: bonding net device that got called 276 * @vid: vlan id being added 277 */ 278 static int bond_vlan_rx_add_vid(struct net_device *bond_dev, 279 __be16 proto, u16 vid) 280 { 281 struct bonding *bond = netdev_priv(bond_dev); 282 struct slave *slave, *rollback_slave; 283 struct list_head *iter; 284 int res; 285 286 bond_for_each_slave(bond, slave, iter) { 287 res = vlan_vid_add(slave->dev, proto, vid); 288 if (res) 289 goto unwind; 290 } 291 292 return 0; 293 294 unwind: 295 /* unwind to the slave that failed */ 296 bond_for_each_slave(bond, rollback_slave, iter) { 297 if (rollback_slave == slave) 298 break; 299 300 vlan_vid_del(rollback_slave->dev, proto, vid); 301 } 302 303 return res; 304 } 305 306 /** 307 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves 308 * @bond_dev: bonding net device that got called 309 * @vid: vlan id being removed 310 */ 311 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, 312 __be16 proto, u16 vid) 313 { 314 struct bonding *bond = netdev_priv(bond_dev); 315 struct list_head *iter; 316 struct slave *slave; 317 318 bond_for_each_slave(bond, slave, iter) 319 vlan_vid_del(slave->dev, proto, vid); 320 321 if (bond_is_lb(bond)) 322 bond_alb_clear_vlan(bond, vid); 323 324 return 0; 325 } 326 327 /*------------------------------- Link status -------------------------------*/ 328 329 /* 330 * Set the carrier state for the master according to the state of its 331 * slaves. If any slaves are up, the master is up. In 802.3ad mode, 332 * do special 802.3ad magic. 333 * 334 * Returns zero if carrier state does not change, nonzero if it does. 335 */ 336 static int bond_set_carrier(struct bonding *bond) 337 { 338 struct list_head *iter; 339 struct slave *slave; 340 341 if (!bond_has_slaves(bond)) 342 goto down; 343 344 if (BOND_MODE(bond) == BOND_MODE_8023AD) 345 return bond_3ad_set_carrier(bond); 346 347 bond_for_each_slave(bond, slave, iter) { 348 if (slave->link == BOND_LINK_UP) { 349 if (!netif_carrier_ok(bond->dev)) { 350 netif_carrier_on(bond->dev); 351 return 1; 352 } 353 return 0; 354 } 355 } 356 357 down: 358 if (netif_carrier_ok(bond->dev)) { 359 netif_carrier_off(bond->dev); 360 return 1; 361 } 362 return 0; 363 } 364 365 /* 366 * Get link speed and duplex from the slave's base driver 367 * using ethtool. If for some reason the call fails or the 368 * values are invalid, set speed and duplex to -1, 369 * and return. 370 */ 371 static void bond_update_speed_duplex(struct slave *slave) 372 { 373 struct net_device *slave_dev = slave->dev; 374 struct ethtool_cmd ecmd; 375 u32 slave_speed; 376 int res; 377 378 slave->speed = SPEED_UNKNOWN; 379 slave->duplex = DUPLEX_UNKNOWN; 380 381 res = __ethtool_get_settings(slave_dev, &ecmd); 382 if (res < 0) 383 return; 384 385 slave_speed = ethtool_cmd_speed(&ecmd); 386 if (slave_speed == 0 || slave_speed == ((__u32) -1)) 387 return; 388 389 switch (ecmd.duplex) { 390 case DUPLEX_FULL: 391 case DUPLEX_HALF: 392 break; 393 default: 394 return; 395 } 396 397 slave->speed = slave_speed; 398 slave->duplex = ecmd.duplex; 399 400 return; 401 } 402 403 const char *bond_slave_link_status(s8 link) 404 { 405 switch (link) { 406 case BOND_LINK_UP: 407 return "up"; 408 case BOND_LINK_FAIL: 409 return "going down"; 410 case BOND_LINK_DOWN: 411 return "down"; 412 case BOND_LINK_BACK: 413 return "going back"; 414 default: 415 return "unknown"; 416 } 417 } 418 419 /* 420 * if <dev> supports MII link status reporting, check its link status. 421 * 422 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), 423 * depending upon the setting of the use_carrier parameter. 424 * 425 * Return either BMSR_LSTATUS, meaning that the link is up (or we 426 * can't tell and just pretend it is), or 0, meaning that the link is 427 * down. 428 * 429 * If reporting is non-zero, instead of faking link up, return -1 if 430 * both ETHTOOL and MII ioctls fail (meaning the device does not 431 * support them). If use_carrier is set, return whatever it says. 432 * It'd be nice if there was a good way to tell if a driver supports 433 * netif_carrier, but there really isn't. 434 */ 435 static int bond_check_dev_link(struct bonding *bond, 436 struct net_device *slave_dev, int reporting) 437 { 438 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 439 int (*ioctl)(struct net_device *, struct ifreq *, int); 440 struct ifreq ifr; 441 struct mii_ioctl_data *mii; 442 443 if (!reporting && !netif_running(slave_dev)) 444 return 0; 445 446 if (bond->params.use_carrier) 447 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; 448 449 /* Try to get link status using Ethtool first. */ 450 if (slave_dev->ethtool_ops->get_link) 451 return slave_dev->ethtool_ops->get_link(slave_dev) ? 452 BMSR_LSTATUS : 0; 453 454 /* Ethtool can't be used, fallback to MII ioctls. */ 455 ioctl = slave_ops->ndo_do_ioctl; 456 if (ioctl) { 457 /* TODO: set pointer to correct ioctl on a per team member */ 458 /* bases to make this more efficient. that is, once */ 459 /* we determine the correct ioctl, we will always */ 460 /* call it and not the others for that team */ 461 /* member. */ 462 463 /* 464 * We cannot assume that SIOCGMIIPHY will also read a 465 * register; not all network drivers (e.g., e100) 466 * support that. 467 */ 468 469 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ 470 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ); 471 mii = if_mii(&ifr); 472 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) { 473 mii->reg_num = MII_BMSR; 474 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) 475 return mii->val_out & BMSR_LSTATUS; 476 } 477 } 478 479 /* 480 * If reporting, report that either there's no dev->do_ioctl, 481 * or both SIOCGMIIREG and get_link failed (meaning that we 482 * cannot report link status). If not reporting, pretend 483 * we're ok. 484 */ 485 return reporting ? -1 : BMSR_LSTATUS; 486 } 487 488 /*----------------------------- Multicast list ------------------------------*/ 489 490 /* 491 * Push the promiscuity flag down to appropriate slaves 492 */ 493 static int bond_set_promiscuity(struct bonding *bond, int inc) 494 { 495 struct list_head *iter; 496 int err = 0; 497 498 if (bond_uses_primary(bond)) { 499 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 500 501 if (curr_active) 502 err = dev_set_promiscuity(curr_active->dev, inc); 503 } else { 504 struct slave *slave; 505 506 bond_for_each_slave(bond, slave, iter) { 507 err = dev_set_promiscuity(slave->dev, inc); 508 if (err) 509 return err; 510 } 511 } 512 return err; 513 } 514 515 /* 516 * Push the allmulti flag down to all slaves 517 */ 518 static int bond_set_allmulti(struct bonding *bond, int inc) 519 { 520 struct list_head *iter; 521 int err = 0; 522 523 if (bond_uses_primary(bond)) { 524 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 525 526 if (curr_active) 527 err = dev_set_allmulti(curr_active->dev, inc); 528 } else { 529 struct slave *slave; 530 531 bond_for_each_slave(bond, slave, iter) { 532 err = dev_set_allmulti(slave->dev, inc); 533 if (err) 534 return err; 535 } 536 } 537 return err; 538 } 539 540 /* 541 * Retrieve the list of registered multicast addresses for the bonding 542 * device and retransmit an IGMP JOIN request to the current active 543 * slave. 544 */ 545 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work) 546 { 547 struct bonding *bond = container_of(work, struct bonding, 548 mcast_work.work); 549 550 if (!rtnl_trylock()) { 551 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 552 return; 553 } 554 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev); 555 556 if (bond->igmp_retrans > 1) { 557 bond->igmp_retrans--; 558 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); 559 } 560 rtnl_unlock(); 561 } 562 563 /* Flush bond's hardware addresses from slave 564 */ 565 static void bond_hw_addr_flush(struct net_device *bond_dev, 566 struct net_device *slave_dev) 567 { 568 struct bonding *bond = netdev_priv(bond_dev); 569 570 dev_uc_unsync(slave_dev, bond_dev); 571 dev_mc_unsync(slave_dev, bond_dev); 572 573 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 574 /* del lacpdu mc addr from mc list */ 575 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 576 577 dev_mc_del(slave_dev, lacpdu_multicast); 578 } 579 } 580 581 /*--------------------------- Active slave change ---------------------------*/ 582 583 /* Update the hardware address list and promisc/allmulti for the new and 584 * old active slaves (if any). Modes that are not using primary keep all 585 * slaves up date at all times; only the modes that use primary need to call 586 * this function to swap these settings during a failover. 587 */ 588 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active, 589 struct slave *old_active) 590 { 591 ASSERT_RTNL(); 592 593 if (old_active) { 594 if (bond->dev->flags & IFF_PROMISC) 595 dev_set_promiscuity(old_active->dev, -1); 596 597 if (bond->dev->flags & IFF_ALLMULTI) 598 dev_set_allmulti(old_active->dev, -1); 599 600 bond_hw_addr_flush(bond->dev, old_active->dev); 601 } 602 603 if (new_active) { 604 /* FIXME: Signal errors upstream. */ 605 if (bond->dev->flags & IFF_PROMISC) 606 dev_set_promiscuity(new_active->dev, 1); 607 608 if (bond->dev->flags & IFF_ALLMULTI) 609 dev_set_allmulti(new_active->dev, 1); 610 611 netif_addr_lock_bh(bond->dev); 612 dev_uc_sync(new_active->dev, bond->dev); 613 dev_mc_sync(new_active->dev, bond->dev); 614 netif_addr_unlock_bh(bond->dev); 615 } 616 } 617 618 /** 619 * bond_set_dev_addr - clone slave's address to bond 620 * @bond_dev: bond net device 621 * @slave_dev: slave net device 622 * 623 * Should be called with RTNL held. 624 */ 625 static void bond_set_dev_addr(struct net_device *bond_dev, 626 struct net_device *slave_dev) 627 { 628 netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n", 629 bond_dev, slave_dev, slave_dev->addr_len); 630 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len); 631 bond_dev->addr_assign_type = NET_ADDR_STOLEN; 632 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev); 633 } 634 635 /* 636 * bond_do_fail_over_mac 637 * 638 * Perform special MAC address swapping for fail_over_mac settings 639 * 640 * Called with RTNL, curr_slave_lock for write_bh. 641 */ 642 static void bond_do_fail_over_mac(struct bonding *bond, 643 struct slave *new_active, 644 struct slave *old_active) 645 __releases(&bond->curr_slave_lock) 646 __acquires(&bond->curr_slave_lock) 647 { 648 u8 tmp_mac[ETH_ALEN]; 649 struct sockaddr saddr; 650 int rv; 651 652 switch (bond->params.fail_over_mac) { 653 case BOND_FOM_ACTIVE: 654 if (new_active) { 655 write_unlock_bh(&bond->curr_slave_lock); 656 bond_set_dev_addr(bond->dev, new_active->dev); 657 write_lock_bh(&bond->curr_slave_lock); 658 } 659 break; 660 case BOND_FOM_FOLLOW: 661 /* 662 * if new_active && old_active, swap them 663 * if just old_active, do nothing (going to no active slave) 664 * if just new_active, set new_active to bond's MAC 665 */ 666 if (!new_active) 667 return; 668 669 write_unlock_bh(&bond->curr_slave_lock); 670 671 if (old_active) { 672 ether_addr_copy(tmp_mac, new_active->dev->dev_addr); 673 ether_addr_copy(saddr.sa_data, 674 old_active->dev->dev_addr); 675 saddr.sa_family = new_active->dev->type; 676 } else { 677 ether_addr_copy(saddr.sa_data, bond->dev->dev_addr); 678 saddr.sa_family = bond->dev->type; 679 } 680 681 rv = dev_set_mac_address(new_active->dev, &saddr); 682 if (rv) { 683 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n", 684 -rv, new_active->dev->name); 685 goto out; 686 } 687 688 if (!old_active) 689 goto out; 690 691 ether_addr_copy(saddr.sa_data, tmp_mac); 692 saddr.sa_family = old_active->dev->type; 693 694 rv = dev_set_mac_address(old_active->dev, &saddr); 695 if (rv) 696 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n", 697 -rv, new_active->dev->name); 698 out: 699 write_lock_bh(&bond->curr_slave_lock); 700 break; 701 default: 702 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n", 703 bond->params.fail_over_mac); 704 break; 705 } 706 707 } 708 709 static bool bond_should_change_active(struct bonding *bond) 710 { 711 struct slave *prim = bond->primary_slave; 712 struct slave *curr = bond_deref_active_protected(bond); 713 714 if (!prim || !curr || curr->link != BOND_LINK_UP) 715 return true; 716 if (bond->force_primary) { 717 bond->force_primary = false; 718 return true; 719 } 720 if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER && 721 (prim->speed < curr->speed || 722 (prim->speed == curr->speed && prim->duplex <= curr->duplex))) 723 return false; 724 if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE) 725 return false; 726 return true; 727 } 728 729 /** 730 * find_best_interface - select the best available slave to be the active one 731 * @bond: our bonding struct 732 */ 733 static struct slave *bond_find_best_slave(struct bonding *bond) 734 { 735 struct slave *slave, *bestslave = NULL; 736 struct list_head *iter; 737 int mintime = bond->params.updelay; 738 739 if (bond->primary_slave && bond->primary_slave->link == BOND_LINK_UP && 740 bond_should_change_active(bond)) 741 return bond->primary_slave; 742 743 bond_for_each_slave(bond, slave, iter) { 744 if (slave->link == BOND_LINK_UP) 745 return slave; 746 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) && 747 slave->delay < mintime) { 748 mintime = slave->delay; 749 bestslave = slave; 750 } 751 } 752 753 return bestslave; 754 } 755 756 static bool bond_should_notify_peers(struct bonding *bond) 757 { 758 struct slave *slave; 759 760 rcu_read_lock(); 761 slave = rcu_dereference(bond->curr_active_slave); 762 rcu_read_unlock(); 763 764 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n", 765 slave ? slave->dev->name : "NULL"); 766 767 if (!slave || !bond->send_peer_notif || 768 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) 769 return false; 770 771 return true; 772 } 773 774 /** 775 * change_active_interface - change the active slave into the specified one 776 * @bond: our bonding struct 777 * @new: the new slave to make the active one 778 * 779 * Set the new slave to the bond's settings and unset them on the old 780 * curr_active_slave. 781 * Setting include flags, mc-list, promiscuity, allmulti, etc. 782 * 783 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, 784 * because it is apparently the best available slave we have, even though its 785 * updelay hasn't timed out yet. 786 * 787 * If new_active is not NULL, caller must hold curr_slave_lock for write_bh. 788 */ 789 void bond_change_active_slave(struct bonding *bond, struct slave *new_active) 790 { 791 struct slave *old_active; 792 793 old_active = rcu_dereference_protected(bond->curr_active_slave, 794 !new_active || 795 lockdep_is_held(&bond->curr_slave_lock)); 796 797 if (old_active == new_active) 798 return; 799 800 if (new_active) { 801 new_active->last_link_up = jiffies; 802 803 if (new_active->link == BOND_LINK_BACK) { 804 if (bond_uses_primary(bond)) { 805 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n", 806 new_active->dev->name, 807 (bond->params.updelay - new_active->delay) * bond->params.miimon); 808 } 809 810 new_active->delay = 0; 811 new_active->link = BOND_LINK_UP; 812 813 if (BOND_MODE(bond) == BOND_MODE_8023AD) 814 bond_3ad_handle_link_change(new_active, BOND_LINK_UP); 815 816 if (bond_is_lb(bond)) 817 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); 818 } else { 819 if (bond_uses_primary(bond)) { 820 netdev_info(bond->dev, "making interface %s the new active one\n", 821 new_active->dev->name); 822 } 823 } 824 } 825 826 if (bond_uses_primary(bond)) 827 bond_hw_addr_swap(bond, new_active, old_active); 828 829 if (bond_is_lb(bond)) { 830 bond_alb_handle_active_change(bond, new_active); 831 if (old_active) 832 bond_set_slave_inactive_flags(old_active, 833 BOND_SLAVE_NOTIFY_NOW); 834 if (new_active) 835 bond_set_slave_active_flags(new_active, 836 BOND_SLAVE_NOTIFY_NOW); 837 } else { 838 rcu_assign_pointer(bond->curr_active_slave, new_active); 839 } 840 841 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) { 842 if (old_active) 843 bond_set_slave_inactive_flags(old_active, 844 BOND_SLAVE_NOTIFY_NOW); 845 846 if (new_active) { 847 bool should_notify_peers = false; 848 849 bond_set_slave_active_flags(new_active, 850 BOND_SLAVE_NOTIFY_NOW); 851 852 if (bond->params.fail_over_mac) 853 bond_do_fail_over_mac(bond, new_active, 854 old_active); 855 856 if (netif_running(bond->dev)) { 857 bond->send_peer_notif = 858 bond->params.num_peer_notif; 859 should_notify_peers = 860 bond_should_notify_peers(bond); 861 } 862 863 write_unlock_bh(&bond->curr_slave_lock); 864 865 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev); 866 if (should_notify_peers) 867 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 868 bond->dev); 869 870 write_lock_bh(&bond->curr_slave_lock); 871 } 872 } 873 874 /* resend IGMP joins since active slave has changed or 875 * all were sent on curr_active_slave. 876 * resend only if bond is brought up with the affected 877 * bonding modes and the retransmission is enabled */ 878 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && 879 ((bond_uses_primary(bond) && new_active) || 880 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) { 881 bond->igmp_retrans = bond->params.resend_igmp; 882 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 883 } 884 } 885 886 /** 887 * bond_select_active_slave - select a new active slave, if needed 888 * @bond: our bonding struct 889 * 890 * This functions should be called when one of the following occurs: 891 * - The old curr_active_slave has been released or lost its link. 892 * - The primary_slave has got its link back. 893 * - A slave has got its link back and there's no old curr_active_slave. 894 * 895 * Caller must hold curr_slave_lock for write_bh. 896 */ 897 void bond_select_active_slave(struct bonding *bond) 898 { 899 struct slave *best_slave; 900 int rv; 901 902 best_slave = bond_find_best_slave(bond); 903 if (best_slave != bond_deref_active_protected(bond)) { 904 bond_change_active_slave(bond, best_slave); 905 rv = bond_set_carrier(bond); 906 if (!rv) 907 return; 908 909 if (netif_carrier_ok(bond->dev)) { 910 netdev_info(bond->dev, "first active interface up!\n"); 911 } else { 912 netdev_info(bond->dev, "now running without any active interface!\n"); 913 } 914 } 915 } 916 917 #ifdef CONFIG_NET_POLL_CONTROLLER 918 static inline int slave_enable_netpoll(struct slave *slave) 919 { 920 struct netpoll *np; 921 int err = 0; 922 923 np = kzalloc(sizeof(*np), GFP_KERNEL); 924 err = -ENOMEM; 925 if (!np) 926 goto out; 927 928 err = __netpoll_setup(np, slave->dev); 929 if (err) { 930 kfree(np); 931 goto out; 932 } 933 slave->np = np; 934 out: 935 return err; 936 } 937 static inline void slave_disable_netpoll(struct slave *slave) 938 { 939 struct netpoll *np = slave->np; 940 941 if (!np) 942 return; 943 944 slave->np = NULL; 945 __netpoll_free_async(np); 946 } 947 948 static void bond_poll_controller(struct net_device *bond_dev) 949 { 950 } 951 952 static void bond_netpoll_cleanup(struct net_device *bond_dev) 953 { 954 struct bonding *bond = netdev_priv(bond_dev); 955 struct list_head *iter; 956 struct slave *slave; 957 958 bond_for_each_slave(bond, slave, iter) 959 if (bond_slave_is_up(slave)) 960 slave_disable_netpoll(slave); 961 } 962 963 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) 964 { 965 struct bonding *bond = netdev_priv(dev); 966 struct list_head *iter; 967 struct slave *slave; 968 int err = 0; 969 970 bond_for_each_slave(bond, slave, iter) { 971 err = slave_enable_netpoll(slave); 972 if (err) { 973 bond_netpoll_cleanup(dev); 974 break; 975 } 976 } 977 return err; 978 } 979 #else 980 static inline int slave_enable_netpoll(struct slave *slave) 981 { 982 return 0; 983 } 984 static inline void slave_disable_netpoll(struct slave *slave) 985 { 986 } 987 static void bond_netpoll_cleanup(struct net_device *bond_dev) 988 { 989 } 990 #endif 991 992 /*---------------------------------- IOCTL ----------------------------------*/ 993 994 static netdev_features_t bond_fix_features(struct net_device *dev, 995 netdev_features_t features) 996 { 997 struct bonding *bond = netdev_priv(dev); 998 struct list_head *iter; 999 netdev_features_t mask; 1000 struct slave *slave; 1001 1002 mask = features; 1003 features &= ~NETIF_F_ONE_FOR_ALL; 1004 features |= NETIF_F_ALL_FOR_ALL; 1005 1006 bond_for_each_slave(bond, slave, iter) { 1007 features = netdev_increment_features(features, 1008 slave->dev->features, 1009 mask); 1010 } 1011 features = netdev_add_tso_features(features, mask); 1012 1013 return features; 1014 } 1015 1016 #define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \ 1017 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \ 1018 NETIF_F_HIGHDMA | NETIF_F_LRO) 1019 1020 #define BOND_ENC_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | NETIF_F_RXCSUM |\ 1021 NETIF_F_TSO | NETIF_F_GSO_UDP_TUNNEL) 1022 1023 static void bond_compute_features(struct bonding *bond) 1024 { 1025 unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE; 1026 netdev_features_t vlan_features = BOND_VLAN_FEATURES; 1027 netdev_features_t enc_features = BOND_ENC_FEATURES; 1028 struct net_device *bond_dev = bond->dev; 1029 struct list_head *iter; 1030 struct slave *slave; 1031 unsigned short max_hard_header_len = ETH_HLEN; 1032 unsigned int gso_max_size = GSO_MAX_SIZE; 1033 u16 gso_max_segs = GSO_MAX_SEGS; 1034 1035 if (!bond_has_slaves(bond)) 1036 goto done; 1037 vlan_features &= NETIF_F_ALL_FOR_ALL; 1038 1039 bond_for_each_slave(bond, slave, iter) { 1040 vlan_features = netdev_increment_features(vlan_features, 1041 slave->dev->vlan_features, BOND_VLAN_FEATURES); 1042 1043 enc_features = netdev_increment_features(enc_features, 1044 slave->dev->hw_enc_features, 1045 BOND_ENC_FEATURES); 1046 dst_release_flag &= slave->dev->priv_flags; 1047 if (slave->dev->hard_header_len > max_hard_header_len) 1048 max_hard_header_len = slave->dev->hard_header_len; 1049 1050 gso_max_size = min(gso_max_size, slave->dev->gso_max_size); 1051 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs); 1052 } 1053 1054 done: 1055 bond_dev->vlan_features = vlan_features; 1056 bond_dev->hw_enc_features = enc_features; 1057 bond_dev->hard_header_len = max_hard_header_len; 1058 bond_dev->gso_max_segs = gso_max_segs; 1059 netif_set_gso_max_size(bond_dev, gso_max_size); 1060 1061 flags = bond_dev->priv_flags & ~IFF_XMIT_DST_RELEASE; 1062 bond_dev->priv_flags = flags | dst_release_flag; 1063 1064 netdev_change_features(bond_dev); 1065 } 1066 1067 static void bond_setup_by_slave(struct net_device *bond_dev, 1068 struct net_device *slave_dev) 1069 { 1070 bond_dev->header_ops = slave_dev->header_ops; 1071 1072 bond_dev->type = slave_dev->type; 1073 bond_dev->hard_header_len = slave_dev->hard_header_len; 1074 bond_dev->addr_len = slave_dev->addr_len; 1075 1076 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1077 slave_dev->addr_len); 1078 } 1079 1080 /* On bonding slaves other than the currently active slave, suppress 1081 * duplicates except for alb non-mcast/bcast. 1082 */ 1083 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1084 struct slave *slave, 1085 struct bonding *bond) 1086 { 1087 if (bond_is_slave_inactive(slave)) { 1088 if (BOND_MODE(bond) == BOND_MODE_ALB && 1089 skb->pkt_type != PACKET_BROADCAST && 1090 skb->pkt_type != PACKET_MULTICAST) 1091 return false; 1092 return true; 1093 } 1094 return false; 1095 } 1096 1097 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1098 { 1099 struct sk_buff *skb = *pskb; 1100 struct slave *slave; 1101 struct bonding *bond; 1102 int (*recv_probe)(const struct sk_buff *, struct bonding *, 1103 struct slave *); 1104 int ret = RX_HANDLER_ANOTHER; 1105 1106 skb = skb_share_check(skb, GFP_ATOMIC); 1107 if (unlikely(!skb)) 1108 return RX_HANDLER_CONSUMED; 1109 1110 *pskb = skb; 1111 1112 slave = bond_slave_get_rcu(skb->dev); 1113 bond = slave->bond; 1114 1115 recv_probe = ACCESS_ONCE(bond->recv_probe); 1116 if (recv_probe) { 1117 ret = recv_probe(skb, bond, slave); 1118 if (ret == RX_HANDLER_CONSUMED) { 1119 consume_skb(skb); 1120 return ret; 1121 } 1122 } 1123 1124 if (bond_should_deliver_exact_match(skb, slave, bond)) { 1125 return RX_HANDLER_EXACT; 1126 } 1127 1128 skb->dev = bond->dev; 1129 1130 if (BOND_MODE(bond) == BOND_MODE_ALB && 1131 bond->dev->priv_flags & IFF_BRIDGE_PORT && 1132 skb->pkt_type == PACKET_HOST) { 1133 1134 if (unlikely(skb_cow_head(skb, 1135 skb->data - skb_mac_header(skb)))) { 1136 kfree_skb(skb); 1137 return RX_HANDLER_CONSUMED; 1138 } 1139 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr); 1140 } 1141 1142 return ret; 1143 } 1144 1145 static int bond_master_upper_dev_link(struct net_device *bond_dev, 1146 struct net_device *slave_dev, 1147 struct slave *slave) 1148 { 1149 int err; 1150 1151 err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, slave); 1152 if (err) 1153 return err; 1154 slave_dev->flags |= IFF_SLAVE; 1155 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL); 1156 return 0; 1157 } 1158 1159 static void bond_upper_dev_unlink(struct net_device *bond_dev, 1160 struct net_device *slave_dev) 1161 { 1162 netdev_upper_dev_unlink(slave_dev, bond_dev); 1163 slave_dev->flags &= ~IFF_SLAVE; 1164 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL); 1165 } 1166 1167 static struct slave *bond_alloc_slave(struct bonding *bond) 1168 { 1169 struct slave *slave = NULL; 1170 1171 slave = kzalloc(sizeof(struct slave), GFP_KERNEL); 1172 if (!slave) 1173 return NULL; 1174 1175 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1176 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info), 1177 GFP_KERNEL); 1178 if (!SLAVE_AD_INFO(slave)) { 1179 kfree(slave); 1180 return NULL; 1181 } 1182 } 1183 return slave; 1184 } 1185 1186 static void bond_free_slave(struct slave *slave) 1187 { 1188 struct bonding *bond = bond_get_bond_by_slave(slave); 1189 1190 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1191 kfree(SLAVE_AD_INFO(slave)); 1192 1193 kfree(slave); 1194 } 1195 1196 /* enslave device <slave> to bond device <master> */ 1197 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev) 1198 { 1199 struct bonding *bond = netdev_priv(bond_dev); 1200 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1201 struct slave *new_slave = NULL, *prev_slave; 1202 struct sockaddr addr; 1203 int link_reporting; 1204 int res = 0, i; 1205 1206 if (!bond->params.use_carrier && 1207 slave_dev->ethtool_ops->get_link == NULL && 1208 slave_ops->ndo_do_ioctl == NULL) { 1209 netdev_warn(bond_dev, "no link monitoring support for %s\n", 1210 slave_dev->name); 1211 } 1212 1213 /* already enslaved */ 1214 if (slave_dev->flags & IFF_SLAVE) { 1215 netdev_dbg(bond_dev, "Error: Device was already enslaved\n"); 1216 return -EBUSY; 1217 } 1218 1219 if (bond_dev == slave_dev) { 1220 netdev_err(bond_dev, "cannot enslave bond to itself.\n"); 1221 return -EPERM; 1222 } 1223 1224 /* vlan challenged mutual exclusion */ 1225 /* no need to lock since we're protected by rtnl_lock */ 1226 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1227 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n", 1228 slave_dev->name); 1229 if (vlan_uses_dev(bond_dev)) { 1230 netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n", 1231 slave_dev->name, bond_dev->name); 1232 return -EPERM; 1233 } else { 1234 netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n", 1235 slave_dev->name, slave_dev->name, 1236 bond_dev->name); 1237 } 1238 } else { 1239 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n", 1240 slave_dev->name); 1241 } 1242 1243 /* 1244 * Old ifenslave binaries are no longer supported. These can 1245 * be identified with moderate accuracy by the state of the slave: 1246 * the current ifenslave will set the interface down prior to 1247 * enslaving it; the old ifenslave will not. 1248 */ 1249 if ((slave_dev->flags & IFF_UP)) { 1250 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n", 1251 slave_dev->name); 1252 res = -EPERM; 1253 goto err_undo_flags; 1254 } 1255 1256 /* set bonding device ether type by slave - bonding netdevices are 1257 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1258 * there is a need to override some of the type dependent attribs/funcs. 1259 * 1260 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1261 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1262 */ 1263 if (!bond_has_slaves(bond)) { 1264 if (bond_dev->type != slave_dev->type) { 1265 netdev_dbg(bond_dev, "change device type from %d to %d\n", 1266 bond_dev->type, slave_dev->type); 1267 1268 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, 1269 bond_dev); 1270 res = notifier_to_errno(res); 1271 if (res) { 1272 netdev_err(bond_dev, "refused to change device type\n"); 1273 res = -EBUSY; 1274 goto err_undo_flags; 1275 } 1276 1277 /* Flush unicast and multicast addresses */ 1278 dev_uc_flush(bond_dev); 1279 dev_mc_flush(bond_dev); 1280 1281 if (slave_dev->type != ARPHRD_ETHER) 1282 bond_setup_by_slave(bond_dev, slave_dev); 1283 else { 1284 ether_setup(bond_dev); 1285 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1286 } 1287 1288 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, 1289 bond_dev); 1290 } 1291 } else if (bond_dev->type != slave_dev->type) { 1292 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n", 1293 slave_dev->name, slave_dev->type, bond_dev->type); 1294 res = -EINVAL; 1295 goto err_undo_flags; 1296 } 1297 1298 if (slave_ops->ndo_set_mac_address == NULL) { 1299 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n"); 1300 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP && 1301 bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1302 if (!bond_has_slaves(bond)) { 1303 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1304 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n"); 1305 } else { 1306 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"); 1307 res = -EOPNOTSUPP; 1308 goto err_undo_flags; 1309 } 1310 } 1311 } 1312 1313 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1314 1315 /* If this is the first slave, then we need to set the master's hardware 1316 * address to be the same as the slave's. */ 1317 if (!bond_has_slaves(bond) && 1318 bond->dev->addr_assign_type == NET_ADDR_RANDOM) 1319 bond_set_dev_addr(bond->dev, slave_dev); 1320 1321 new_slave = bond_alloc_slave(bond); 1322 if (!new_slave) { 1323 res = -ENOMEM; 1324 goto err_undo_flags; 1325 } 1326 1327 new_slave->bond = bond; 1328 new_slave->dev = slave_dev; 1329 /* 1330 * Set the new_slave's queue_id to be zero. Queue ID mapping 1331 * is set via sysfs or module option if desired. 1332 */ 1333 new_slave->queue_id = 0; 1334 1335 /* Save slave's original mtu and then set it to match the bond */ 1336 new_slave->original_mtu = slave_dev->mtu; 1337 res = dev_set_mtu(slave_dev, bond->dev->mtu); 1338 if (res) { 1339 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res); 1340 goto err_free; 1341 } 1342 1343 /* 1344 * Save slave's original ("permanent") mac address for modes 1345 * that need it, and for restoring it upon release, and then 1346 * set it to the master's address 1347 */ 1348 ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr); 1349 1350 if (!bond->params.fail_over_mac || 1351 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1352 /* 1353 * Set slave to master's mac address. The application already 1354 * set the master's mac address to that of the first slave 1355 */ 1356 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 1357 addr.sa_family = slave_dev->type; 1358 res = dev_set_mac_address(slave_dev, &addr); 1359 if (res) { 1360 netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res); 1361 goto err_restore_mtu; 1362 } 1363 } 1364 1365 /* open the slave since the application closed it */ 1366 res = dev_open(slave_dev); 1367 if (res) { 1368 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name); 1369 goto err_restore_mac; 1370 } 1371 1372 slave_dev->priv_flags |= IFF_BONDING; 1373 1374 if (bond_is_lb(bond)) { 1375 /* bond_alb_init_slave() must be called before all other stages since 1376 * it might fail and we do not want to have to undo everything 1377 */ 1378 res = bond_alb_init_slave(bond, new_slave); 1379 if (res) 1380 goto err_close; 1381 } 1382 1383 /* If the mode uses primary, then the following is handled by 1384 * bond_change_active_slave(). 1385 */ 1386 if (!bond_uses_primary(bond)) { 1387 /* set promiscuity level to new slave */ 1388 if (bond_dev->flags & IFF_PROMISC) { 1389 res = dev_set_promiscuity(slave_dev, 1); 1390 if (res) 1391 goto err_close; 1392 } 1393 1394 /* set allmulti level to new slave */ 1395 if (bond_dev->flags & IFF_ALLMULTI) { 1396 res = dev_set_allmulti(slave_dev, 1); 1397 if (res) 1398 goto err_close; 1399 } 1400 1401 netif_addr_lock_bh(bond_dev); 1402 1403 dev_mc_sync_multiple(slave_dev, bond_dev); 1404 dev_uc_sync_multiple(slave_dev, bond_dev); 1405 1406 netif_addr_unlock_bh(bond_dev); 1407 } 1408 1409 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1410 /* add lacpdu mc addr to mc list */ 1411 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 1412 1413 dev_mc_add(slave_dev, lacpdu_multicast); 1414 } 1415 1416 res = vlan_vids_add_by_dev(slave_dev, bond_dev); 1417 if (res) { 1418 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n", 1419 slave_dev->name); 1420 goto err_close; 1421 } 1422 1423 prev_slave = bond_last_slave(bond); 1424 1425 new_slave->delay = 0; 1426 new_slave->link_failure_count = 0; 1427 1428 bond_update_speed_duplex(new_slave); 1429 1430 new_slave->last_rx = jiffies - 1431 (msecs_to_jiffies(bond->params.arp_interval) + 1); 1432 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) 1433 new_slave->target_last_arp_rx[i] = new_slave->last_rx; 1434 1435 if (bond->params.miimon && !bond->params.use_carrier) { 1436 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 1437 1438 if ((link_reporting == -1) && !bond->params.arp_interval) { 1439 /* 1440 * miimon is set but a bonded network driver 1441 * does not support ETHTOOL/MII and 1442 * arp_interval is not set. Note: if 1443 * use_carrier is enabled, we will never go 1444 * here (because netif_carrier is always 1445 * supported); thus, we don't need to change 1446 * the messages for netif_carrier. 1447 */ 1448 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", 1449 slave_dev->name); 1450 } else if (link_reporting == -1) { 1451 /* unable get link status using mii/ethtool */ 1452 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", 1453 slave_dev->name); 1454 } 1455 } 1456 1457 /* check for initial state */ 1458 if (bond->params.miimon) { 1459 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { 1460 if (bond->params.updelay) { 1461 new_slave->link = BOND_LINK_BACK; 1462 new_slave->delay = bond->params.updelay; 1463 } else { 1464 new_slave->link = BOND_LINK_UP; 1465 } 1466 } else { 1467 new_slave->link = BOND_LINK_DOWN; 1468 } 1469 } else if (bond->params.arp_interval) { 1470 new_slave->link = (netif_carrier_ok(slave_dev) ? 1471 BOND_LINK_UP : BOND_LINK_DOWN); 1472 } else { 1473 new_slave->link = BOND_LINK_UP; 1474 } 1475 1476 if (new_slave->link != BOND_LINK_DOWN) 1477 new_slave->last_link_up = jiffies; 1478 netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n", 1479 new_slave->link == BOND_LINK_DOWN ? "DOWN" : 1480 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); 1481 1482 if (bond_uses_primary(bond) && bond->params.primary[0]) { 1483 /* if there is a primary slave, remember it */ 1484 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 1485 bond->primary_slave = new_slave; 1486 bond->force_primary = true; 1487 } 1488 } 1489 1490 switch (BOND_MODE(bond)) { 1491 case BOND_MODE_ACTIVEBACKUP: 1492 bond_set_slave_inactive_flags(new_slave, 1493 BOND_SLAVE_NOTIFY_NOW); 1494 break; 1495 case BOND_MODE_8023AD: 1496 /* in 802.3ad mode, the internal mechanism 1497 * will activate the slaves in the selected 1498 * aggregator 1499 */ 1500 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 1501 /* if this is the first slave */ 1502 if (!prev_slave) { 1503 SLAVE_AD_INFO(new_slave)->id = 1; 1504 /* Initialize AD with the number of times that the AD timer is called in 1 second 1505 * can be called only after the mac address of the bond is set 1506 */ 1507 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL); 1508 } else { 1509 SLAVE_AD_INFO(new_slave)->id = 1510 SLAVE_AD_INFO(prev_slave)->id + 1; 1511 } 1512 1513 bond_3ad_bind_slave(new_slave); 1514 break; 1515 case BOND_MODE_TLB: 1516 case BOND_MODE_ALB: 1517 bond_set_active_slave(new_slave); 1518 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 1519 break; 1520 default: 1521 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n"); 1522 1523 /* always active in trunk mode */ 1524 bond_set_active_slave(new_slave); 1525 1526 /* In trunking mode there is little meaning to curr_active_slave 1527 * anyway (it holds no special properties of the bond device), 1528 * so we can change it without calling change_active_interface() 1529 */ 1530 if (!rcu_access_pointer(bond->curr_active_slave) && 1531 new_slave->link == BOND_LINK_UP) 1532 rcu_assign_pointer(bond->curr_active_slave, new_slave); 1533 1534 break; 1535 } /* switch(bond_mode) */ 1536 1537 #ifdef CONFIG_NET_POLL_CONTROLLER 1538 slave_dev->npinfo = bond->dev->npinfo; 1539 if (slave_dev->npinfo) { 1540 if (slave_enable_netpoll(new_slave)) { 1541 netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n"); 1542 res = -EBUSY; 1543 goto err_detach; 1544 } 1545 } 1546 #endif 1547 1548 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 1549 new_slave); 1550 if (res) { 1551 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res); 1552 goto err_detach; 1553 } 1554 1555 res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave); 1556 if (res) { 1557 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res); 1558 goto err_unregister; 1559 } 1560 1561 res = bond_sysfs_slave_add(new_slave); 1562 if (res) { 1563 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res); 1564 goto err_upper_unlink; 1565 } 1566 1567 bond->slave_cnt++; 1568 bond_compute_features(bond); 1569 bond_set_carrier(bond); 1570 1571 if (bond_uses_primary(bond)) { 1572 block_netpoll_tx(); 1573 write_lock_bh(&bond->curr_slave_lock); 1574 bond_select_active_slave(bond); 1575 write_unlock_bh(&bond->curr_slave_lock); 1576 unblock_netpoll_tx(); 1577 } 1578 1579 netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n", 1580 slave_dev->name, 1581 bond_is_active_slave(new_slave) ? "an active" : "a backup", 1582 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down"); 1583 1584 /* enslave is successful */ 1585 return 0; 1586 1587 /* Undo stages on error */ 1588 err_upper_unlink: 1589 bond_upper_dev_unlink(bond_dev, slave_dev); 1590 1591 err_unregister: 1592 netdev_rx_handler_unregister(slave_dev); 1593 1594 err_detach: 1595 if (!bond_uses_primary(bond)) 1596 bond_hw_addr_flush(bond_dev, slave_dev); 1597 1598 vlan_vids_del_by_dev(slave_dev, bond_dev); 1599 if (bond->primary_slave == new_slave) 1600 bond->primary_slave = NULL; 1601 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) { 1602 block_netpoll_tx(); 1603 write_lock_bh(&bond->curr_slave_lock); 1604 bond_change_active_slave(bond, NULL); 1605 bond_select_active_slave(bond); 1606 write_unlock_bh(&bond->curr_slave_lock); 1607 unblock_netpoll_tx(); 1608 } 1609 slave_disable_netpoll(new_slave); 1610 1611 err_close: 1612 slave_dev->priv_flags &= ~IFF_BONDING; 1613 dev_close(slave_dev); 1614 1615 err_restore_mac: 1616 if (!bond->params.fail_over_mac || 1617 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1618 /* XXX TODO - fom follow mode needs to change master's 1619 * MAC if this slave's MAC is in use by the bond, or at 1620 * least print a warning. 1621 */ 1622 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr); 1623 addr.sa_family = slave_dev->type; 1624 dev_set_mac_address(slave_dev, &addr); 1625 } 1626 1627 err_restore_mtu: 1628 dev_set_mtu(slave_dev, new_slave->original_mtu); 1629 1630 err_free: 1631 bond_free_slave(new_slave); 1632 1633 err_undo_flags: 1634 /* Enslave of first slave has failed and we need to fix master's mac */ 1635 if (!bond_has_slaves(bond) && 1636 ether_addr_equal_64bits(bond_dev->dev_addr, slave_dev->dev_addr)) 1637 eth_hw_addr_random(bond_dev); 1638 1639 return res; 1640 } 1641 1642 /* 1643 * Try to release the slave device <slave> from the bond device <master> 1644 * It is legal to access curr_active_slave without a lock because all the function 1645 * is write-locked. If "all" is true it means that the function is being called 1646 * while destroying a bond interface and all slaves are being released. 1647 * 1648 * The rules for slave state should be: 1649 * for Active/Backup: 1650 * Active stays on all backups go down 1651 * for Bonded connections: 1652 * The first up interface should be left on and all others downed. 1653 */ 1654 static int __bond_release_one(struct net_device *bond_dev, 1655 struct net_device *slave_dev, 1656 bool all) 1657 { 1658 struct bonding *bond = netdev_priv(bond_dev); 1659 struct slave *slave, *oldcurrent; 1660 struct sockaddr addr; 1661 int old_flags = bond_dev->flags; 1662 netdev_features_t old_features = bond_dev->features; 1663 1664 /* slave is not a slave or master is not master of this slave */ 1665 if (!(slave_dev->flags & IFF_SLAVE) || 1666 !netdev_has_upper_dev(slave_dev, bond_dev)) { 1667 netdev_err(bond_dev, "cannot release %s\n", 1668 slave_dev->name); 1669 return -EINVAL; 1670 } 1671 1672 block_netpoll_tx(); 1673 1674 slave = bond_get_slave_by_dev(bond, slave_dev); 1675 if (!slave) { 1676 /* not a slave of this bond */ 1677 netdev_info(bond_dev, "%s not enslaved\n", 1678 slave_dev->name); 1679 unblock_netpoll_tx(); 1680 return -EINVAL; 1681 } 1682 1683 bond_sysfs_slave_del(slave); 1684 1685 bond_upper_dev_unlink(bond_dev, slave_dev); 1686 /* unregister rx_handler early so bond_handle_frame wouldn't be called 1687 * for this slave anymore. 1688 */ 1689 netdev_rx_handler_unregister(slave_dev); 1690 write_lock_bh(&bond->lock); 1691 1692 /* Inform AD package of unbinding of slave. */ 1693 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1694 bond_3ad_unbind_slave(slave); 1695 1696 write_unlock_bh(&bond->lock); 1697 1698 netdev_info(bond_dev, "Releasing %s interface %s\n", 1699 bond_is_active_slave(slave) ? "active" : "backup", 1700 slave_dev->name); 1701 1702 oldcurrent = rcu_access_pointer(bond->curr_active_slave); 1703 1704 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 1705 1706 if (!all && (!bond->params.fail_over_mac || 1707 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) { 1708 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) && 1709 bond_has_slaves(bond)) 1710 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", 1711 slave_dev->name, slave->perm_hwaddr, 1712 bond_dev->name, slave_dev->name); 1713 } 1714 1715 if (bond->primary_slave == slave) 1716 bond->primary_slave = NULL; 1717 1718 if (oldcurrent == slave) { 1719 write_lock_bh(&bond->curr_slave_lock); 1720 bond_change_active_slave(bond, NULL); 1721 write_unlock_bh(&bond->curr_slave_lock); 1722 } 1723 1724 if (bond_is_lb(bond)) { 1725 /* Must be called only after the slave has been 1726 * detached from the list and the curr_active_slave 1727 * has been cleared (if our_slave == old_current), 1728 * but before a new active slave is selected. 1729 */ 1730 bond_alb_deinit_slave(bond, slave); 1731 } 1732 1733 if (all) { 1734 RCU_INIT_POINTER(bond->curr_active_slave, NULL); 1735 } else if (oldcurrent == slave) { 1736 /* 1737 * Note that we hold RTNL over this sequence, so there 1738 * is no concern that another slave add/remove event 1739 * will interfere. 1740 */ 1741 write_lock_bh(&bond->curr_slave_lock); 1742 1743 bond_select_active_slave(bond); 1744 1745 write_unlock_bh(&bond->curr_slave_lock); 1746 } 1747 1748 if (!bond_has_slaves(bond)) { 1749 bond_set_carrier(bond); 1750 eth_hw_addr_random(bond_dev); 1751 } 1752 1753 unblock_netpoll_tx(); 1754 synchronize_rcu(); 1755 bond->slave_cnt--; 1756 1757 if (!bond_has_slaves(bond)) { 1758 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 1759 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev); 1760 } 1761 1762 bond_compute_features(bond); 1763 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 1764 (old_features & NETIF_F_VLAN_CHALLENGED)) 1765 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n", 1766 slave_dev->name, bond_dev->name); 1767 1768 /* must do this from outside any spinlocks */ 1769 vlan_vids_del_by_dev(slave_dev, bond_dev); 1770 1771 /* If the mode uses primary, then this cases was handled above by 1772 * bond_change_active_slave(..., NULL) 1773 */ 1774 if (!bond_uses_primary(bond)) { 1775 /* unset promiscuity level from slave 1776 * NOTE: The NETDEV_CHANGEADDR call above may change the value 1777 * of the IFF_PROMISC flag in the bond_dev, but we need the 1778 * value of that flag before that change, as that was the value 1779 * when this slave was attached, so we cache at the start of the 1780 * function and use it here. Same goes for ALLMULTI below 1781 */ 1782 if (old_flags & IFF_PROMISC) 1783 dev_set_promiscuity(slave_dev, -1); 1784 1785 /* unset allmulti level from slave */ 1786 if (old_flags & IFF_ALLMULTI) 1787 dev_set_allmulti(slave_dev, -1); 1788 1789 bond_hw_addr_flush(bond_dev, slave_dev); 1790 } 1791 1792 slave_disable_netpoll(slave); 1793 1794 /* close slave before restoring its mac address */ 1795 dev_close(slave_dev); 1796 1797 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE || 1798 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1799 /* restore original ("permanent") mac address */ 1800 ether_addr_copy(addr.sa_data, slave->perm_hwaddr); 1801 addr.sa_family = slave_dev->type; 1802 dev_set_mac_address(slave_dev, &addr); 1803 } 1804 1805 dev_set_mtu(slave_dev, slave->original_mtu); 1806 1807 slave_dev->priv_flags &= ~IFF_BONDING; 1808 1809 bond_free_slave(slave); 1810 1811 return 0; /* deletion OK */ 1812 } 1813 1814 /* A wrapper used because of ndo_del_link */ 1815 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 1816 { 1817 return __bond_release_one(bond_dev, slave_dev, false); 1818 } 1819 1820 /* 1821 * First release a slave and then destroy the bond if no more slaves are left. 1822 * Must be under rtnl_lock when this function is called. 1823 */ 1824 static int bond_release_and_destroy(struct net_device *bond_dev, 1825 struct net_device *slave_dev) 1826 { 1827 struct bonding *bond = netdev_priv(bond_dev); 1828 int ret; 1829 1830 ret = bond_release(bond_dev, slave_dev); 1831 if (ret == 0 && !bond_has_slaves(bond)) { 1832 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 1833 netdev_info(bond_dev, "Destroying bond %s\n", 1834 bond_dev->name); 1835 unregister_netdevice(bond_dev); 1836 } 1837 return ret; 1838 } 1839 1840 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info) 1841 { 1842 struct bonding *bond = netdev_priv(bond_dev); 1843 1844 info->bond_mode = BOND_MODE(bond); 1845 info->miimon = bond->params.miimon; 1846 1847 info->num_slaves = bond->slave_cnt; 1848 1849 return 0; 1850 } 1851 1852 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 1853 { 1854 struct bonding *bond = netdev_priv(bond_dev); 1855 struct list_head *iter; 1856 int i = 0, res = -ENODEV; 1857 struct slave *slave; 1858 1859 bond_for_each_slave(bond, slave, iter) { 1860 if (i++ == (int)info->slave_id) { 1861 res = 0; 1862 strcpy(info->slave_name, slave->dev->name); 1863 info->link = slave->link; 1864 info->state = bond_slave_state(slave); 1865 info->link_failure_count = slave->link_failure_count; 1866 break; 1867 } 1868 } 1869 1870 return res; 1871 } 1872 1873 /*-------------------------------- Monitoring -------------------------------*/ 1874 1875 /* called with rcu_read_lock() */ 1876 static int bond_miimon_inspect(struct bonding *bond) 1877 { 1878 int link_state, commit = 0; 1879 struct list_head *iter; 1880 struct slave *slave; 1881 bool ignore_updelay; 1882 1883 ignore_updelay = !rcu_dereference(bond->curr_active_slave); 1884 1885 bond_for_each_slave_rcu(bond, slave, iter) { 1886 slave->new_link = BOND_LINK_NOCHANGE; 1887 1888 link_state = bond_check_dev_link(bond, slave->dev, 0); 1889 1890 switch (slave->link) { 1891 case BOND_LINK_UP: 1892 if (link_state) 1893 continue; 1894 1895 slave->link = BOND_LINK_FAIL; 1896 slave->delay = bond->params.downdelay; 1897 if (slave->delay) { 1898 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n", 1899 (BOND_MODE(bond) == 1900 BOND_MODE_ACTIVEBACKUP) ? 1901 (bond_is_active_slave(slave) ? 1902 "active " : "backup ") : "", 1903 slave->dev->name, 1904 bond->params.downdelay * bond->params.miimon); 1905 } 1906 /*FALLTHRU*/ 1907 case BOND_LINK_FAIL: 1908 if (link_state) { 1909 /* 1910 * recovered before downdelay expired 1911 */ 1912 slave->link = BOND_LINK_UP; 1913 slave->last_link_up = jiffies; 1914 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n", 1915 (bond->params.downdelay - slave->delay) * 1916 bond->params.miimon, 1917 slave->dev->name); 1918 continue; 1919 } 1920 1921 if (slave->delay <= 0) { 1922 slave->new_link = BOND_LINK_DOWN; 1923 commit++; 1924 continue; 1925 } 1926 1927 slave->delay--; 1928 break; 1929 1930 case BOND_LINK_DOWN: 1931 if (!link_state) 1932 continue; 1933 1934 slave->link = BOND_LINK_BACK; 1935 slave->delay = bond->params.updelay; 1936 1937 if (slave->delay) { 1938 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n", 1939 slave->dev->name, 1940 ignore_updelay ? 0 : 1941 bond->params.updelay * 1942 bond->params.miimon); 1943 } 1944 /*FALLTHRU*/ 1945 case BOND_LINK_BACK: 1946 if (!link_state) { 1947 slave->link = BOND_LINK_DOWN; 1948 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n", 1949 (bond->params.updelay - slave->delay) * 1950 bond->params.miimon, 1951 slave->dev->name); 1952 1953 continue; 1954 } 1955 1956 if (ignore_updelay) 1957 slave->delay = 0; 1958 1959 if (slave->delay <= 0) { 1960 slave->new_link = BOND_LINK_UP; 1961 commit++; 1962 ignore_updelay = false; 1963 continue; 1964 } 1965 1966 slave->delay--; 1967 break; 1968 } 1969 } 1970 1971 return commit; 1972 } 1973 1974 static void bond_miimon_commit(struct bonding *bond) 1975 { 1976 struct list_head *iter; 1977 struct slave *slave; 1978 1979 bond_for_each_slave(bond, slave, iter) { 1980 switch (slave->new_link) { 1981 case BOND_LINK_NOCHANGE: 1982 continue; 1983 1984 case BOND_LINK_UP: 1985 slave->link = BOND_LINK_UP; 1986 slave->last_link_up = jiffies; 1987 1988 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1989 /* prevent it from being the active one */ 1990 bond_set_backup_slave(slave); 1991 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1992 /* make it immediately active */ 1993 bond_set_active_slave(slave); 1994 } else if (slave != bond->primary_slave) { 1995 /* prevent it from being the active one */ 1996 bond_set_backup_slave(slave); 1997 } 1998 1999 netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n", 2000 slave->dev->name, 2001 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed, 2002 slave->duplex ? "full" : "half"); 2003 2004 /* notify ad that the link status has changed */ 2005 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2006 bond_3ad_handle_link_change(slave, BOND_LINK_UP); 2007 2008 if (bond_is_lb(bond)) 2009 bond_alb_handle_link_change(bond, slave, 2010 BOND_LINK_UP); 2011 2012 if (!bond->curr_active_slave || 2013 (slave == bond->primary_slave)) 2014 goto do_failover; 2015 2016 continue; 2017 2018 case BOND_LINK_DOWN: 2019 if (slave->link_failure_count < UINT_MAX) 2020 slave->link_failure_count++; 2021 2022 slave->link = BOND_LINK_DOWN; 2023 2024 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP || 2025 BOND_MODE(bond) == BOND_MODE_8023AD) 2026 bond_set_slave_inactive_flags(slave, 2027 BOND_SLAVE_NOTIFY_NOW); 2028 2029 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n", 2030 slave->dev->name); 2031 2032 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2033 bond_3ad_handle_link_change(slave, 2034 BOND_LINK_DOWN); 2035 2036 if (bond_is_lb(bond)) 2037 bond_alb_handle_link_change(bond, slave, 2038 BOND_LINK_DOWN); 2039 2040 if (slave == rcu_access_pointer(bond->curr_active_slave)) 2041 goto do_failover; 2042 2043 continue; 2044 2045 default: 2046 netdev_err(bond->dev, "invalid new link %d on slave %s\n", 2047 slave->new_link, slave->dev->name); 2048 slave->new_link = BOND_LINK_NOCHANGE; 2049 2050 continue; 2051 } 2052 2053 do_failover: 2054 ASSERT_RTNL(); 2055 block_netpoll_tx(); 2056 write_lock_bh(&bond->curr_slave_lock); 2057 bond_select_active_slave(bond); 2058 write_unlock_bh(&bond->curr_slave_lock); 2059 unblock_netpoll_tx(); 2060 } 2061 2062 bond_set_carrier(bond); 2063 } 2064 2065 /* 2066 * bond_mii_monitor 2067 * 2068 * Really a wrapper that splits the mii monitor into two phases: an 2069 * inspection, then (if inspection indicates something needs to be done) 2070 * an acquisition of appropriate locks followed by a commit phase to 2071 * implement whatever link state changes are indicated. 2072 */ 2073 static void bond_mii_monitor(struct work_struct *work) 2074 { 2075 struct bonding *bond = container_of(work, struct bonding, 2076 mii_work.work); 2077 bool should_notify_peers = false; 2078 unsigned long delay; 2079 2080 delay = msecs_to_jiffies(bond->params.miimon); 2081 2082 if (!bond_has_slaves(bond)) 2083 goto re_arm; 2084 2085 rcu_read_lock(); 2086 2087 should_notify_peers = bond_should_notify_peers(bond); 2088 2089 if (bond_miimon_inspect(bond)) { 2090 rcu_read_unlock(); 2091 2092 /* Race avoidance with bond_close cancel of workqueue */ 2093 if (!rtnl_trylock()) { 2094 delay = 1; 2095 should_notify_peers = false; 2096 goto re_arm; 2097 } 2098 2099 bond_miimon_commit(bond); 2100 2101 rtnl_unlock(); /* might sleep, hold no other locks */ 2102 } else 2103 rcu_read_unlock(); 2104 2105 re_arm: 2106 if (bond->params.miimon) 2107 queue_delayed_work(bond->wq, &bond->mii_work, delay); 2108 2109 if (should_notify_peers) { 2110 if (!rtnl_trylock()) 2111 return; 2112 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); 2113 rtnl_unlock(); 2114 } 2115 } 2116 2117 static bool bond_has_this_ip(struct bonding *bond, __be32 ip) 2118 { 2119 struct net_device *upper; 2120 struct list_head *iter; 2121 bool ret = false; 2122 2123 if (ip == bond_confirm_addr(bond->dev, 0, ip)) 2124 return true; 2125 2126 rcu_read_lock(); 2127 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) { 2128 if (ip == bond_confirm_addr(upper, 0, ip)) { 2129 ret = true; 2130 break; 2131 } 2132 } 2133 rcu_read_unlock(); 2134 2135 return ret; 2136 } 2137 2138 /* 2139 * We go to the (large) trouble of VLAN tagging ARP frames because 2140 * switches in VLAN mode (especially if ports are configured as 2141 * "native" to a VLAN) might not pass non-tagged frames. 2142 */ 2143 static void bond_arp_send(struct net_device *slave_dev, int arp_op, 2144 __be32 dest_ip, __be32 src_ip, 2145 struct bond_vlan_tag *tags) 2146 { 2147 struct sk_buff *skb; 2148 struct bond_vlan_tag *outer_tag = tags; 2149 2150 netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n", 2151 arp_op, slave_dev->name, &dest_ip, &src_ip); 2152 2153 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2154 NULL, slave_dev->dev_addr, NULL); 2155 2156 if (!skb) { 2157 net_err_ratelimited("ARP packet allocation failed\n"); 2158 return; 2159 } 2160 2161 if (!tags || tags->vlan_proto == VLAN_N_VID) 2162 goto xmit; 2163 2164 tags++; 2165 2166 /* Go through all the tags backwards and add them to the packet */ 2167 while (tags->vlan_proto != VLAN_N_VID) { 2168 if (!tags->vlan_id) { 2169 tags++; 2170 continue; 2171 } 2172 2173 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n", 2174 ntohs(outer_tag->vlan_proto), tags->vlan_id); 2175 skb = __vlan_put_tag(skb, tags->vlan_proto, 2176 tags->vlan_id); 2177 if (!skb) { 2178 net_err_ratelimited("failed to insert inner VLAN tag\n"); 2179 return; 2180 } 2181 2182 tags++; 2183 } 2184 /* Set the outer tag */ 2185 if (outer_tag->vlan_id) { 2186 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n", 2187 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id); 2188 skb = vlan_put_tag(skb, outer_tag->vlan_proto, 2189 outer_tag->vlan_id); 2190 if (!skb) { 2191 net_err_ratelimited("failed to insert outer VLAN tag\n"); 2192 return; 2193 } 2194 } 2195 2196 xmit: 2197 arp_xmit(skb); 2198 } 2199 2200 /* Validate the device path between the @start_dev and the @end_dev. 2201 * The path is valid if the @end_dev is reachable through device 2202 * stacking. 2203 * When the path is validated, collect any vlan information in the 2204 * path. 2205 */ 2206 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev, 2207 struct net_device *end_dev, 2208 int level) 2209 { 2210 struct bond_vlan_tag *tags; 2211 struct net_device *upper; 2212 struct list_head *iter; 2213 2214 if (start_dev == end_dev) { 2215 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC); 2216 if (!tags) 2217 return ERR_PTR(-ENOMEM); 2218 tags[level].vlan_proto = VLAN_N_VID; 2219 return tags; 2220 } 2221 2222 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) { 2223 tags = bond_verify_device_path(upper, end_dev, level + 1); 2224 if (IS_ERR_OR_NULL(tags)) { 2225 if (IS_ERR(tags)) 2226 return tags; 2227 continue; 2228 } 2229 if (is_vlan_dev(upper)) { 2230 tags[level].vlan_proto = vlan_dev_vlan_proto(upper); 2231 tags[level].vlan_id = vlan_dev_vlan_id(upper); 2232 } 2233 2234 return tags; 2235 } 2236 2237 return NULL; 2238 } 2239 2240 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2241 { 2242 struct rtable *rt; 2243 struct bond_vlan_tag *tags; 2244 __be32 *targets = bond->params.arp_targets, addr; 2245 int i; 2246 2247 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) { 2248 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]); 2249 tags = NULL; 2250 2251 /* Find out through which dev should the packet go */ 2252 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 2253 RTO_ONLINK, 0); 2254 if (IS_ERR(rt)) { 2255 /* there's no route to target - try to send arp 2256 * probe to generate any traffic (arp_validate=0) 2257 */ 2258 if (bond->params.arp_validate) 2259 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n", 2260 bond->dev->name, 2261 &targets[i]); 2262 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2263 0, tags); 2264 continue; 2265 } 2266 2267 /* bond device itself */ 2268 if (rt->dst.dev == bond->dev) 2269 goto found; 2270 2271 rcu_read_lock(); 2272 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0); 2273 rcu_read_unlock(); 2274 2275 if (!IS_ERR_OR_NULL(tags)) 2276 goto found; 2277 2278 /* Not our device - skip */ 2279 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n", 2280 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL"); 2281 2282 ip_rt_put(rt); 2283 continue; 2284 2285 found: 2286 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0); 2287 ip_rt_put(rt); 2288 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2289 addr, tags); 2290 kfree(tags); 2291 } 2292 } 2293 2294 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 2295 { 2296 int i; 2297 2298 if (!sip || !bond_has_this_ip(bond, tip)) { 2299 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n", 2300 &sip, &tip); 2301 return; 2302 } 2303 2304 i = bond_get_targets_ip(bond->params.arp_targets, sip); 2305 if (i == -1) { 2306 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n", 2307 &sip); 2308 return; 2309 } 2310 slave->last_rx = jiffies; 2311 slave->target_last_arp_rx[i] = jiffies; 2312 } 2313 2314 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, 2315 struct slave *slave) 2316 { 2317 struct arphdr *arp = (struct arphdr *)skb->data; 2318 struct slave *curr_active_slave; 2319 unsigned char *arp_ptr; 2320 __be32 sip, tip; 2321 int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP); 2322 2323 if (!slave_do_arp_validate(bond, slave)) { 2324 if ((slave_do_arp_validate_only(bond) && is_arp) || 2325 !slave_do_arp_validate_only(bond)) 2326 slave->last_rx = jiffies; 2327 return RX_HANDLER_ANOTHER; 2328 } else if (!is_arp) { 2329 return RX_HANDLER_ANOTHER; 2330 } 2331 2332 alen = arp_hdr_len(bond->dev); 2333 2334 netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n", 2335 skb->dev->name); 2336 2337 if (alen > skb_headlen(skb)) { 2338 arp = kmalloc(alen, GFP_ATOMIC); 2339 if (!arp) 2340 goto out_unlock; 2341 if (skb_copy_bits(skb, 0, arp, alen) < 0) 2342 goto out_unlock; 2343 } 2344 2345 if (arp->ar_hln != bond->dev->addr_len || 2346 skb->pkt_type == PACKET_OTHERHOST || 2347 skb->pkt_type == PACKET_LOOPBACK || 2348 arp->ar_hrd != htons(ARPHRD_ETHER) || 2349 arp->ar_pro != htons(ETH_P_IP) || 2350 arp->ar_pln != 4) 2351 goto out_unlock; 2352 2353 arp_ptr = (unsigned char *)(arp + 1); 2354 arp_ptr += bond->dev->addr_len; 2355 memcpy(&sip, arp_ptr, 4); 2356 arp_ptr += 4 + bond->dev->addr_len; 2357 memcpy(&tip, arp_ptr, 4); 2358 2359 netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n", 2360 slave->dev->name, bond_slave_state(slave), 2361 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 2362 &sip, &tip); 2363 2364 curr_active_slave = rcu_dereference(bond->curr_active_slave); 2365 2366 /* 2367 * Backup slaves won't see the ARP reply, but do come through 2368 * here for each ARP probe (so we swap the sip/tip to validate 2369 * the probe). In a "redundant switch, common router" type of 2370 * configuration, the ARP probe will (hopefully) travel from 2371 * the active, through one switch, the router, then the other 2372 * switch before reaching the backup. 2373 * 2374 * We 'trust' the arp requests if there is an active slave and 2375 * it received valid arp reply(s) after it became active. This 2376 * is done to avoid endless looping when we can't reach the 2377 * arp_ip_target and fool ourselves with our own arp requests. 2378 */ 2379 2380 if (bond_is_active_slave(slave)) 2381 bond_validate_arp(bond, slave, sip, tip); 2382 else if (curr_active_slave && 2383 time_after(slave_last_rx(bond, curr_active_slave), 2384 curr_active_slave->last_link_up)) 2385 bond_validate_arp(bond, slave, tip, sip); 2386 2387 out_unlock: 2388 if (arp != (struct arphdr *)skb->data) 2389 kfree(arp); 2390 return RX_HANDLER_ANOTHER; 2391 } 2392 2393 /* function to verify if we're in the arp_interval timeslice, returns true if 2394 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval + 2395 * arp_interval/2) . the arp_interval/2 is needed for really fast networks. 2396 */ 2397 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 2398 int mod) 2399 { 2400 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2401 2402 return time_in_range(jiffies, 2403 last_act - delta_in_ticks, 2404 last_act + mod * delta_in_ticks + delta_in_ticks/2); 2405 } 2406 2407 /* 2408 * this function is called regularly to monitor each slave's link 2409 * ensuring that traffic is being sent and received when arp monitoring 2410 * is used in load-balancing mode. if the adapter has been dormant, then an 2411 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 2412 * arp monitoring in active backup mode. 2413 */ 2414 static void bond_loadbalance_arp_mon(struct work_struct *work) 2415 { 2416 struct bonding *bond = container_of(work, struct bonding, 2417 arp_work.work); 2418 struct slave *slave, *oldcurrent; 2419 struct list_head *iter; 2420 int do_failover = 0, slave_state_changed = 0; 2421 2422 if (!bond_has_slaves(bond)) 2423 goto re_arm; 2424 2425 rcu_read_lock(); 2426 2427 oldcurrent = rcu_dereference(bond->curr_active_slave); 2428 /* see if any of the previous devices are up now (i.e. they have 2429 * xmt and rcv traffic). the curr_active_slave does not come into 2430 * the picture unless it is null. also, slave->last_link_up is not 2431 * needed here because we send an arp on each slave and give a slave 2432 * as long as it needs to get the tx/rx within the delta. 2433 * TODO: what about up/down delay in arp mode? it wasn't here before 2434 * so it can wait 2435 */ 2436 bond_for_each_slave_rcu(bond, slave, iter) { 2437 unsigned long trans_start = dev_trans_start(slave->dev); 2438 2439 if (slave->link != BOND_LINK_UP) { 2440 if (bond_time_in_interval(bond, trans_start, 1) && 2441 bond_time_in_interval(bond, slave->last_rx, 1)) { 2442 2443 slave->link = BOND_LINK_UP; 2444 slave_state_changed = 1; 2445 2446 /* primary_slave has no meaning in round-robin 2447 * mode. the window of a slave being up and 2448 * curr_active_slave being null after enslaving 2449 * is closed. 2450 */ 2451 if (!oldcurrent) { 2452 netdev_info(bond->dev, "link status definitely up for interface %s\n", 2453 slave->dev->name); 2454 do_failover = 1; 2455 } else { 2456 netdev_info(bond->dev, "interface %s is now up\n", 2457 slave->dev->name); 2458 } 2459 } 2460 } else { 2461 /* slave->link == BOND_LINK_UP */ 2462 2463 /* not all switches will respond to an arp request 2464 * when the source ip is 0, so don't take the link down 2465 * if we don't know our ip yet 2466 */ 2467 if (!bond_time_in_interval(bond, trans_start, 2) || 2468 !bond_time_in_interval(bond, slave->last_rx, 2)) { 2469 2470 slave->link = BOND_LINK_DOWN; 2471 slave_state_changed = 1; 2472 2473 if (slave->link_failure_count < UINT_MAX) 2474 slave->link_failure_count++; 2475 2476 netdev_info(bond->dev, "interface %s is now down\n", 2477 slave->dev->name); 2478 2479 if (slave == oldcurrent) 2480 do_failover = 1; 2481 } 2482 } 2483 2484 /* note: if switch is in round-robin mode, all links 2485 * must tx arp to ensure all links rx an arp - otherwise 2486 * links may oscillate or not come up at all; if switch is 2487 * in something like xor mode, there is nothing we can 2488 * do - all replies will be rx'ed on same link causing slaves 2489 * to be unstable during low/no traffic periods 2490 */ 2491 if (bond_slave_is_up(slave)) 2492 bond_arp_send_all(bond, slave); 2493 } 2494 2495 rcu_read_unlock(); 2496 2497 if (do_failover || slave_state_changed) { 2498 if (!rtnl_trylock()) 2499 goto re_arm; 2500 2501 if (slave_state_changed) { 2502 bond_slave_state_change(bond); 2503 } else if (do_failover) { 2504 /* the bond_select_active_slave must hold RTNL 2505 * and curr_slave_lock for write. 2506 */ 2507 block_netpoll_tx(); 2508 write_lock_bh(&bond->curr_slave_lock); 2509 2510 bond_select_active_slave(bond); 2511 2512 write_unlock_bh(&bond->curr_slave_lock); 2513 unblock_netpoll_tx(); 2514 } 2515 rtnl_unlock(); 2516 } 2517 2518 re_arm: 2519 if (bond->params.arp_interval) 2520 queue_delayed_work(bond->wq, &bond->arp_work, 2521 msecs_to_jiffies(bond->params.arp_interval)); 2522 } 2523 2524 /* 2525 * Called to inspect slaves for active-backup mode ARP monitor link state 2526 * changes. Sets new_link in slaves to specify what action should take 2527 * place for the slave. Returns 0 if no changes are found, >0 if changes 2528 * to link states must be committed. 2529 * 2530 * Called with rcu_read_lock hold. 2531 */ 2532 static int bond_ab_arp_inspect(struct bonding *bond) 2533 { 2534 unsigned long trans_start, last_rx; 2535 struct list_head *iter; 2536 struct slave *slave; 2537 int commit = 0; 2538 2539 bond_for_each_slave_rcu(bond, slave, iter) { 2540 slave->new_link = BOND_LINK_NOCHANGE; 2541 last_rx = slave_last_rx(bond, slave); 2542 2543 if (slave->link != BOND_LINK_UP) { 2544 if (bond_time_in_interval(bond, last_rx, 1)) { 2545 slave->new_link = BOND_LINK_UP; 2546 commit++; 2547 } 2548 continue; 2549 } 2550 2551 /* 2552 * Give slaves 2*delta after being enslaved or made 2553 * active. This avoids bouncing, as the last receive 2554 * times need a full ARP monitor cycle to be updated. 2555 */ 2556 if (bond_time_in_interval(bond, slave->last_link_up, 2)) 2557 continue; 2558 2559 /* 2560 * Backup slave is down if: 2561 * - No current_arp_slave AND 2562 * - more than 3*delta since last receive AND 2563 * - the bond has an IP address 2564 * 2565 * Note: a non-null current_arp_slave indicates 2566 * the curr_active_slave went down and we are 2567 * searching for a new one; under this condition 2568 * we only take the curr_active_slave down - this 2569 * gives each slave a chance to tx/rx traffic 2570 * before being taken out 2571 */ 2572 if (!bond_is_active_slave(slave) && 2573 !rcu_access_pointer(bond->current_arp_slave) && 2574 !bond_time_in_interval(bond, last_rx, 3)) { 2575 slave->new_link = BOND_LINK_DOWN; 2576 commit++; 2577 } 2578 2579 /* 2580 * Active slave is down if: 2581 * - more than 2*delta since transmitting OR 2582 * - (more than 2*delta since receive AND 2583 * the bond has an IP address) 2584 */ 2585 trans_start = dev_trans_start(slave->dev); 2586 if (bond_is_active_slave(slave) && 2587 (!bond_time_in_interval(bond, trans_start, 2) || 2588 !bond_time_in_interval(bond, last_rx, 2))) { 2589 slave->new_link = BOND_LINK_DOWN; 2590 commit++; 2591 } 2592 } 2593 2594 return commit; 2595 } 2596 2597 /* 2598 * Called to commit link state changes noted by inspection step of 2599 * active-backup mode ARP monitor. 2600 * 2601 * Called with RTNL hold. 2602 */ 2603 static void bond_ab_arp_commit(struct bonding *bond) 2604 { 2605 unsigned long trans_start; 2606 struct list_head *iter; 2607 struct slave *slave; 2608 2609 bond_for_each_slave(bond, slave, iter) { 2610 switch (slave->new_link) { 2611 case BOND_LINK_NOCHANGE: 2612 continue; 2613 2614 case BOND_LINK_UP: 2615 trans_start = dev_trans_start(slave->dev); 2616 if (rtnl_dereference(bond->curr_active_slave) != slave || 2617 (!rtnl_dereference(bond->curr_active_slave) && 2618 bond_time_in_interval(bond, trans_start, 1))) { 2619 struct slave *current_arp_slave; 2620 2621 current_arp_slave = rtnl_dereference(bond->current_arp_slave); 2622 slave->link = BOND_LINK_UP; 2623 if (current_arp_slave) { 2624 bond_set_slave_inactive_flags( 2625 current_arp_slave, 2626 BOND_SLAVE_NOTIFY_NOW); 2627 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2628 } 2629 2630 netdev_info(bond->dev, "link status definitely up for interface %s\n", 2631 slave->dev->name); 2632 2633 if (!rtnl_dereference(bond->curr_active_slave) || 2634 (slave == bond->primary_slave)) 2635 goto do_failover; 2636 2637 } 2638 2639 continue; 2640 2641 case BOND_LINK_DOWN: 2642 if (slave->link_failure_count < UINT_MAX) 2643 slave->link_failure_count++; 2644 2645 slave->link = BOND_LINK_DOWN; 2646 bond_set_slave_inactive_flags(slave, 2647 BOND_SLAVE_NOTIFY_NOW); 2648 2649 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n", 2650 slave->dev->name); 2651 2652 if (slave == rtnl_dereference(bond->curr_active_slave)) { 2653 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2654 goto do_failover; 2655 } 2656 2657 continue; 2658 2659 default: 2660 netdev_err(bond->dev, "impossible: new_link %d on slave %s\n", 2661 slave->new_link, slave->dev->name); 2662 continue; 2663 } 2664 2665 do_failover: 2666 ASSERT_RTNL(); 2667 block_netpoll_tx(); 2668 write_lock_bh(&bond->curr_slave_lock); 2669 bond_select_active_slave(bond); 2670 write_unlock_bh(&bond->curr_slave_lock); 2671 unblock_netpoll_tx(); 2672 } 2673 2674 bond_set_carrier(bond); 2675 } 2676 2677 /* 2678 * Send ARP probes for active-backup mode ARP monitor. 2679 * 2680 * Called with rcu_read_lock hold. 2681 */ 2682 static bool bond_ab_arp_probe(struct bonding *bond) 2683 { 2684 struct slave *slave, *before = NULL, *new_slave = NULL, 2685 *curr_arp_slave = rcu_dereference(bond->current_arp_slave), 2686 *curr_active_slave = rcu_dereference(bond->curr_active_slave); 2687 struct list_head *iter; 2688 bool found = false; 2689 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; 2690 2691 if (curr_arp_slave && curr_active_slave) 2692 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n", 2693 curr_arp_slave->dev->name, 2694 curr_active_slave->dev->name); 2695 2696 if (curr_active_slave) { 2697 bond_arp_send_all(bond, curr_active_slave); 2698 return should_notify_rtnl; 2699 } 2700 2701 /* if we don't have a curr_active_slave, search for the next available 2702 * backup slave from the current_arp_slave and make it the candidate 2703 * for becoming the curr_active_slave 2704 */ 2705 2706 if (!curr_arp_slave) { 2707 curr_arp_slave = bond_first_slave_rcu(bond); 2708 if (!curr_arp_slave) 2709 return should_notify_rtnl; 2710 } 2711 2712 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER); 2713 2714 bond_for_each_slave_rcu(bond, slave, iter) { 2715 if (!found && !before && bond_slave_is_up(slave)) 2716 before = slave; 2717 2718 if (found && !new_slave && bond_slave_is_up(slave)) 2719 new_slave = slave; 2720 /* if the link state is up at this point, we 2721 * mark it down - this can happen if we have 2722 * simultaneous link failures and 2723 * reselect_active_interface doesn't make this 2724 * one the current slave so it is still marked 2725 * up when it is actually down 2726 */ 2727 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 2728 slave->link = BOND_LINK_DOWN; 2729 if (slave->link_failure_count < UINT_MAX) 2730 slave->link_failure_count++; 2731 2732 bond_set_slave_inactive_flags(slave, 2733 BOND_SLAVE_NOTIFY_LATER); 2734 2735 netdev_info(bond->dev, "backup interface %s is now down\n", 2736 slave->dev->name); 2737 } 2738 if (slave == curr_arp_slave) 2739 found = true; 2740 } 2741 2742 if (!new_slave && before) 2743 new_slave = before; 2744 2745 if (!new_slave) 2746 goto check_state; 2747 2748 new_slave->link = BOND_LINK_BACK; 2749 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER); 2750 bond_arp_send_all(bond, new_slave); 2751 new_slave->last_link_up = jiffies; 2752 rcu_assign_pointer(bond->current_arp_slave, new_slave); 2753 2754 check_state: 2755 bond_for_each_slave_rcu(bond, slave, iter) { 2756 if (slave->should_notify) { 2757 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; 2758 break; 2759 } 2760 } 2761 return should_notify_rtnl; 2762 } 2763 2764 static void bond_activebackup_arp_mon(struct work_struct *work) 2765 { 2766 struct bonding *bond = container_of(work, struct bonding, 2767 arp_work.work); 2768 bool should_notify_peers = false; 2769 bool should_notify_rtnl = false; 2770 int delta_in_ticks; 2771 2772 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2773 2774 if (!bond_has_slaves(bond)) 2775 goto re_arm; 2776 2777 rcu_read_lock(); 2778 2779 should_notify_peers = bond_should_notify_peers(bond); 2780 2781 if (bond_ab_arp_inspect(bond)) { 2782 rcu_read_unlock(); 2783 2784 /* Race avoidance with bond_close flush of workqueue */ 2785 if (!rtnl_trylock()) { 2786 delta_in_ticks = 1; 2787 should_notify_peers = false; 2788 goto re_arm; 2789 } 2790 2791 bond_ab_arp_commit(bond); 2792 2793 rtnl_unlock(); 2794 rcu_read_lock(); 2795 } 2796 2797 should_notify_rtnl = bond_ab_arp_probe(bond); 2798 rcu_read_unlock(); 2799 2800 re_arm: 2801 if (bond->params.arp_interval) 2802 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 2803 2804 if (should_notify_peers || should_notify_rtnl) { 2805 if (!rtnl_trylock()) 2806 return; 2807 2808 if (should_notify_peers) 2809 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 2810 bond->dev); 2811 if (should_notify_rtnl) 2812 bond_slave_state_notify(bond); 2813 2814 rtnl_unlock(); 2815 } 2816 } 2817 2818 /*-------------------------- netdev event handling --------------------------*/ 2819 2820 /* 2821 * Change device name 2822 */ 2823 static int bond_event_changename(struct bonding *bond) 2824 { 2825 bond_remove_proc_entry(bond); 2826 bond_create_proc_entry(bond); 2827 2828 bond_debug_reregister(bond); 2829 2830 return NOTIFY_DONE; 2831 } 2832 2833 static int bond_master_netdev_event(unsigned long event, 2834 struct net_device *bond_dev) 2835 { 2836 struct bonding *event_bond = netdev_priv(bond_dev); 2837 2838 switch (event) { 2839 case NETDEV_CHANGENAME: 2840 return bond_event_changename(event_bond); 2841 case NETDEV_UNREGISTER: 2842 bond_remove_proc_entry(event_bond); 2843 break; 2844 case NETDEV_REGISTER: 2845 bond_create_proc_entry(event_bond); 2846 break; 2847 case NETDEV_NOTIFY_PEERS: 2848 if (event_bond->send_peer_notif) 2849 event_bond->send_peer_notif--; 2850 break; 2851 default: 2852 break; 2853 } 2854 2855 return NOTIFY_DONE; 2856 } 2857 2858 static int bond_slave_netdev_event(unsigned long event, 2859 struct net_device *slave_dev) 2860 { 2861 struct slave *slave = bond_slave_get_rtnl(slave_dev); 2862 struct bonding *bond; 2863 struct net_device *bond_dev; 2864 u32 old_speed; 2865 u8 old_duplex; 2866 2867 /* A netdev event can be generated while enslaving a device 2868 * before netdev_rx_handler_register is called in which case 2869 * slave will be NULL 2870 */ 2871 if (!slave) 2872 return NOTIFY_DONE; 2873 bond_dev = slave->bond->dev; 2874 bond = slave->bond; 2875 2876 switch (event) { 2877 case NETDEV_UNREGISTER: 2878 if (bond_dev->type != ARPHRD_ETHER) 2879 bond_release_and_destroy(bond_dev, slave_dev); 2880 else 2881 bond_release(bond_dev, slave_dev); 2882 break; 2883 case NETDEV_UP: 2884 case NETDEV_CHANGE: 2885 old_speed = slave->speed; 2886 old_duplex = slave->duplex; 2887 2888 bond_update_speed_duplex(slave); 2889 2890 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 2891 if (old_speed != slave->speed) 2892 bond_3ad_adapter_speed_changed(slave); 2893 if (old_duplex != slave->duplex) 2894 bond_3ad_adapter_duplex_changed(slave); 2895 } 2896 break; 2897 case NETDEV_DOWN: 2898 /* 2899 * ... Or is it this? 2900 */ 2901 break; 2902 case NETDEV_CHANGEMTU: 2903 /* 2904 * TODO: Should slaves be allowed to 2905 * independently alter their MTU? For 2906 * an active-backup bond, slaves need 2907 * not be the same type of device, so 2908 * MTUs may vary. For other modes, 2909 * slaves arguably should have the 2910 * same MTUs. To do this, we'd need to 2911 * take over the slave's change_mtu 2912 * function for the duration of their 2913 * servitude. 2914 */ 2915 break; 2916 case NETDEV_CHANGENAME: 2917 /* we don't care if we don't have primary set */ 2918 if (!bond_uses_primary(bond) || 2919 !bond->params.primary[0]) 2920 break; 2921 2922 if (slave == bond->primary_slave) { 2923 /* slave's name changed - he's no longer primary */ 2924 bond->primary_slave = NULL; 2925 } else if (!strcmp(slave_dev->name, bond->params.primary)) { 2926 /* we have a new primary slave */ 2927 bond->primary_slave = slave; 2928 } else { /* we didn't change primary - exit */ 2929 break; 2930 } 2931 2932 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n", 2933 bond->primary_slave ? slave_dev->name : "none"); 2934 2935 block_netpoll_tx(); 2936 write_lock_bh(&bond->curr_slave_lock); 2937 bond_select_active_slave(bond); 2938 write_unlock_bh(&bond->curr_slave_lock); 2939 unblock_netpoll_tx(); 2940 break; 2941 case NETDEV_FEAT_CHANGE: 2942 bond_compute_features(bond); 2943 break; 2944 case NETDEV_RESEND_IGMP: 2945 /* Propagate to master device */ 2946 call_netdevice_notifiers(event, slave->bond->dev); 2947 break; 2948 default: 2949 break; 2950 } 2951 2952 return NOTIFY_DONE; 2953 } 2954 2955 /* 2956 * bond_netdev_event: handle netdev notifier chain events. 2957 * 2958 * This function receives events for the netdev chain. The caller (an 2959 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 2960 * locks for us to safely manipulate the slave devices (RTNL lock, 2961 * dev_probe_lock). 2962 */ 2963 static int bond_netdev_event(struct notifier_block *this, 2964 unsigned long event, void *ptr) 2965 { 2966 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 2967 2968 netdev_dbg(event_dev, "event: %lx\n", event); 2969 2970 if (!(event_dev->priv_flags & IFF_BONDING)) 2971 return NOTIFY_DONE; 2972 2973 if (event_dev->flags & IFF_MASTER) { 2974 netdev_dbg(event_dev, "IFF_MASTER\n"); 2975 return bond_master_netdev_event(event, event_dev); 2976 } 2977 2978 if (event_dev->flags & IFF_SLAVE) { 2979 netdev_dbg(event_dev, "IFF_SLAVE\n"); 2980 return bond_slave_netdev_event(event, event_dev); 2981 } 2982 2983 return NOTIFY_DONE; 2984 } 2985 2986 static struct notifier_block bond_netdev_notifier = { 2987 .notifier_call = bond_netdev_event, 2988 }; 2989 2990 /*---------------------------- Hashing Policies -----------------------------*/ 2991 2992 /* L2 hash helper */ 2993 static inline u32 bond_eth_hash(struct sk_buff *skb) 2994 { 2995 struct ethhdr *ep, hdr_tmp; 2996 2997 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp); 2998 if (ep) 2999 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto; 3000 return 0; 3001 } 3002 3003 /* Extract the appropriate headers based on bond's xmit policy */ 3004 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, 3005 struct flow_keys *fk) 3006 { 3007 const struct ipv6hdr *iph6; 3008 const struct iphdr *iph; 3009 int noff, proto = -1; 3010 3011 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23) 3012 return skb_flow_dissect(skb, fk); 3013 3014 fk->ports = 0; 3015 noff = skb_network_offset(skb); 3016 if (skb->protocol == htons(ETH_P_IP)) { 3017 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph)))) 3018 return false; 3019 iph = ip_hdr(skb); 3020 fk->src = iph->saddr; 3021 fk->dst = iph->daddr; 3022 noff += iph->ihl << 2; 3023 if (!ip_is_fragment(iph)) 3024 proto = iph->protocol; 3025 } else if (skb->protocol == htons(ETH_P_IPV6)) { 3026 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6)))) 3027 return false; 3028 iph6 = ipv6_hdr(skb); 3029 fk->src = (__force __be32)ipv6_addr_hash(&iph6->saddr); 3030 fk->dst = (__force __be32)ipv6_addr_hash(&iph6->daddr); 3031 noff += sizeof(*iph6); 3032 proto = iph6->nexthdr; 3033 } else { 3034 return false; 3035 } 3036 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0) 3037 fk->ports = skb_flow_get_ports(skb, noff, proto); 3038 3039 return true; 3040 } 3041 3042 /** 3043 * bond_xmit_hash - generate a hash value based on the xmit policy 3044 * @bond: bonding device 3045 * @skb: buffer to use for headers 3046 * 3047 * This function will extract the necessary headers from the skb buffer and use 3048 * them to generate a hash based on the xmit_policy set in the bonding device 3049 */ 3050 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb) 3051 { 3052 struct flow_keys flow; 3053 u32 hash; 3054 3055 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 || 3056 !bond_flow_dissect(bond, skb, &flow)) 3057 return bond_eth_hash(skb); 3058 3059 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 || 3060 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) 3061 hash = bond_eth_hash(skb); 3062 else 3063 hash = (__force u32)flow.ports; 3064 hash ^= (__force u32)flow.dst ^ (__force u32)flow.src; 3065 hash ^= (hash >> 16); 3066 hash ^= (hash >> 8); 3067 3068 return hash; 3069 } 3070 3071 /*-------------------------- Device entry points ----------------------------*/ 3072 3073 static void bond_work_init_all(struct bonding *bond) 3074 { 3075 INIT_DELAYED_WORK(&bond->mcast_work, 3076 bond_resend_igmp_join_requests_delayed); 3077 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 3078 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 3079 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3080 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon); 3081 else 3082 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon); 3083 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 3084 } 3085 3086 static void bond_work_cancel_all(struct bonding *bond) 3087 { 3088 cancel_delayed_work_sync(&bond->mii_work); 3089 cancel_delayed_work_sync(&bond->arp_work); 3090 cancel_delayed_work_sync(&bond->alb_work); 3091 cancel_delayed_work_sync(&bond->ad_work); 3092 cancel_delayed_work_sync(&bond->mcast_work); 3093 } 3094 3095 static int bond_open(struct net_device *bond_dev) 3096 { 3097 struct bonding *bond = netdev_priv(bond_dev); 3098 struct list_head *iter; 3099 struct slave *slave; 3100 3101 /* reset slave->backup and slave->inactive */ 3102 read_lock(&bond->lock); 3103 if (bond_has_slaves(bond)) { 3104 read_lock(&bond->curr_slave_lock); 3105 bond_for_each_slave(bond, slave, iter) { 3106 if (bond_uses_primary(bond) && 3107 slave != rcu_access_pointer(bond->curr_active_slave)) { 3108 bond_set_slave_inactive_flags(slave, 3109 BOND_SLAVE_NOTIFY_NOW); 3110 } else { 3111 bond_set_slave_active_flags(slave, 3112 BOND_SLAVE_NOTIFY_NOW); 3113 } 3114 } 3115 read_unlock(&bond->curr_slave_lock); 3116 } 3117 read_unlock(&bond->lock); 3118 3119 bond_work_init_all(bond); 3120 3121 if (bond_is_lb(bond)) { 3122 /* bond_alb_initialize must be called before the timer 3123 * is started. 3124 */ 3125 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB))) 3126 return -ENOMEM; 3127 if (bond->params.tlb_dynamic_lb) 3128 queue_delayed_work(bond->wq, &bond->alb_work, 0); 3129 } 3130 3131 if (bond->params.miimon) /* link check interval, in milliseconds. */ 3132 queue_delayed_work(bond->wq, &bond->mii_work, 0); 3133 3134 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 3135 queue_delayed_work(bond->wq, &bond->arp_work, 0); 3136 bond->recv_probe = bond_arp_rcv; 3137 } 3138 3139 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3140 queue_delayed_work(bond->wq, &bond->ad_work, 0); 3141 /* register to receive LACPDUs */ 3142 bond->recv_probe = bond_3ad_lacpdu_recv; 3143 bond_3ad_initiate_agg_selection(bond, 1); 3144 } 3145 3146 return 0; 3147 } 3148 3149 static int bond_close(struct net_device *bond_dev) 3150 { 3151 struct bonding *bond = netdev_priv(bond_dev); 3152 3153 bond_work_cancel_all(bond); 3154 bond->send_peer_notif = 0; 3155 if (bond_is_lb(bond)) 3156 bond_alb_deinitialize(bond); 3157 bond->recv_probe = NULL; 3158 3159 return 0; 3160 } 3161 3162 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev, 3163 struct rtnl_link_stats64 *stats) 3164 { 3165 struct bonding *bond = netdev_priv(bond_dev); 3166 struct rtnl_link_stats64 temp; 3167 struct list_head *iter; 3168 struct slave *slave; 3169 3170 memset(stats, 0, sizeof(*stats)); 3171 3172 read_lock_bh(&bond->lock); 3173 bond_for_each_slave(bond, slave, iter) { 3174 const struct rtnl_link_stats64 *sstats = 3175 dev_get_stats(slave->dev, &temp); 3176 3177 stats->rx_packets += sstats->rx_packets; 3178 stats->rx_bytes += sstats->rx_bytes; 3179 stats->rx_errors += sstats->rx_errors; 3180 stats->rx_dropped += sstats->rx_dropped; 3181 3182 stats->tx_packets += sstats->tx_packets; 3183 stats->tx_bytes += sstats->tx_bytes; 3184 stats->tx_errors += sstats->tx_errors; 3185 stats->tx_dropped += sstats->tx_dropped; 3186 3187 stats->multicast += sstats->multicast; 3188 stats->collisions += sstats->collisions; 3189 3190 stats->rx_length_errors += sstats->rx_length_errors; 3191 stats->rx_over_errors += sstats->rx_over_errors; 3192 stats->rx_crc_errors += sstats->rx_crc_errors; 3193 stats->rx_frame_errors += sstats->rx_frame_errors; 3194 stats->rx_fifo_errors += sstats->rx_fifo_errors; 3195 stats->rx_missed_errors += sstats->rx_missed_errors; 3196 3197 stats->tx_aborted_errors += sstats->tx_aborted_errors; 3198 stats->tx_carrier_errors += sstats->tx_carrier_errors; 3199 stats->tx_fifo_errors += sstats->tx_fifo_errors; 3200 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors; 3201 stats->tx_window_errors += sstats->tx_window_errors; 3202 } 3203 read_unlock_bh(&bond->lock); 3204 3205 return stats; 3206 } 3207 3208 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 3209 { 3210 struct bonding *bond = netdev_priv(bond_dev); 3211 struct net_device *slave_dev = NULL; 3212 struct ifbond k_binfo; 3213 struct ifbond __user *u_binfo = NULL; 3214 struct ifslave k_sinfo; 3215 struct ifslave __user *u_sinfo = NULL; 3216 struct mii_ioctl_data *mii = NULL; 3217 struct bond_opt_value newval; 3218 struct net *net; 3219 int res = 0; 3220 3221 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd); 3222 3223 switch (cmd) { 3224 case SIOCGMIIPHY: 3225 mii = if_mii(ifr); 3226 if (!mii) 3227 return -EINVAL; 3228 3229 mii->phy_id = 0; 3230 /* Fall Through */ 3231 case SIOCGMIIREG: 3232 /* 3233 * We do this again just in case we were called by SIOCGMIIREG 3234 * instead of SIOCGMIIPHY. 3235 */ 3236 mii = if_mii(ifr); 3237 if (!mii) 3238 return -EINVAL; 3239 3240 3241 if (mii->reg_num == 1) { 3242 mii->val_out = 0; 3243 read_lock(&bond->lock); 3244 read_lock(&bond->curr_slave_lock); 3245 if (netif_carrier_ok(bond->dev)) 3246 mii->val_out = BMSR_LSTATUS; 3247 3248 read_unlock(&bond->curr_slave_lock); 3249 read_unlock(&bond->lock); 3250 } 3251 3252 return 0; 3253 case BOND_INFO_QUERY_OLD: 3254 case SIOCBONDINFOQUERY: 3255 u_binfo = (struct ifbond __user *)ifr->ifr_data; 3256 3257 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 3258 return -EFAULT; 3259 3260 res = bond_info_query(bond_dev, &k_binfo); 3261 if (res == 0 && 3262 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 3263 return -EFAULT; 3264 3265 return res; 3266 case BOND_SLAVE_INFO_QUERY_OLD: 3267 case SIOCBONDSLAVEINFOQUERY: 3268 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 3269 3270 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 3271 return -EFAULT; 3272 3273 res = bond_slave_info_query(bond_dev, &k_sinfo); 3274 if (res == 0 && 3275 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 3276 return -EFAULT; 3277 3278 return res; 3279 default: 3280 /* Go on */ 3281 break; 3282 } 3283 3284 net = dev_net(bond_dev); 3285 3286 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3287 return -EPERM; 3288 3289 slave_dev = __dev_get_by_name(net, ifr->ifr_slave); 3290 3291 netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev); 3292 3293 if (!slave_dev) 3294 return -ENODEV; 3295 3296 netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name); 3297 switch (cmd) { 3298 case BOND_ENSLAVE_OLD: 3299 case SIOCBONDENSLAVE: 3300 res = bond_enslave(bond_dev, slave_dev); 3301 break; 3302 case BOND_RELEASE_OLD: 3303 case SIOCBONDRELEASE: 3304 res = bond_release(bond_dev, slave_dev); 3305 break; 3306 case BOND_SETHWADDR_OLD: 3307 case SIOCBONDSETHWADDR: 3308 bond_set_dev_addr(bond_dev, slave_dev); 3309 res = 0; 3310 break; 3311 case BOND_CHANGE_ACTIVE_OLD: 3312 case SIOCBONDCHANGEACTIVE: 3313 bond_opt_initstr(&newval, slave_dev->name); 3314 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval); 3315 break; 3316 default: 3317 res = -EOPNOTSUPP; 3318 } 3319 3320 return res; 3321 } 3322 3323 static void bond_change_rx_flags(struct net_device *bond_dev, int change) 3324 { 3325 struct bonding *bond = netdev_priv(bond_dev); 3326 3327 if (change & IFF_PROMISC) 3328 bond_set_promiscuity(bond, 3329 bond_dev->flags & IFF_PROMISC ? 1 : -1); 3330 3331 if (change & IFF_ALLMULTI) 3332 bond_set_allmulti(bond, 3333 bond_dev->flags & IFF_ALLMULTI ? 1 : -1); 3334 } 3335 3336 static void bond_set_rx_mode(struct net_device *bond_dev) 3337 { 3338 struct bonding *bond = netdev_priv(bond_dev); 3339 struct list_head *iter; 3340 struct slave *slave; 3341 3342 3343 rcu_read_lock(); 3344 if (bond_uses_primary(bond)) { 3345 slave = rcu_dereference(bond->curr_active_slave); 3346 if (slave) { 3347 dev_uc_sync(slave->dev, bond_dev); 3348 dev_mc_sync(slave->dev, bond_dev); 3349 } 3350 } else { 3351 bond_for_each_slave_rcu(bond, slave, iter) { 3352 dev_uc_sync_multiple(slave->dev, bond_dev); 3353 dev_mc_sync_multiple(slave->dev, bond_dev); 3354 } 3355 } 3356 rcu_read_unlock(); 3357 } 3358 3359 static int bond_neigh_init(struct neighbour *n) 3360 { 3361 struct bonding *bond = netdev_priv(n->dev); 3362 const struct net_device_ops *slave_ops; 3363 struct neigh_parms parms; 3364 struct slave *slave; 3365 int ret; 3366 3367 slave = bond_first_slave(bond); 3368 if (!slave) 3369 return 0; 3370 slave_ops = slave->dev->netdev_ops; 3371 if (!slave_ops->ndo_neigh_setup) 3372 return 0; 3373 3374 parms.neigh_setup = NULL; 3375 parms.neigh_cleanup = NULL; 3376 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); 3377 if (ret) 3378 return ret; 3379 3380 /* 3381 * Assign slave's neigh_cleanup to neighbour in case cleanup is called 3382 * after the last slave has been detached. Assumes that all slaves 3383 * utilize the same neigh_cleanup (true at this writing as only user 3384 * is ipoib). 3385 */ 3386 n->parms->neigh_cleanup = parms.neigh_cleanup; 3387 3388 if (!parms.neigh_setup) 3389 return 0; 3390 3391 return parms.neigh_setup(n); 3392 } 3393 3394 /* 3395 * The bonding ndo_neigh_setup is called at init time beofre any 3396 * slave exists. So we must declare proxy setup function which will 3397 * be used at run time to resolve the actual slave neigh param setup. 3398 * 3399 * It's also called by master devices (such as vlans) to setup their 3400 * underlying devices. In that case - do nothing, we're already set up from 3401 * our init. 3402 */ 3403 static int bond_neigh_setup(struct net_device *dev, 3404 struct neigh_parms *parms) 3405 { 3406 /* modify only our neigh_parms */ 3407 if (parms->dev == dev) 3408 parms->neigh_setup = bond_neigh_init; 3409 3410 return 0; 3411 } 3412 3413 /* 3414 * Change the MTU of all of a master's slaves to match the master 3415 */ 3416 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 3417 { 3418 struct bonding *bond = netdev_priv(bond_dev); 3419 struct slave *slave, *rollback_slave; 3420 struct list_head *iter; 3421 int res = 0; 3422 3423 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu); 3424 3425 /* Can't hold bond->lock with bh disabled here since 3426 * some base drivers panic. On the other hand we can't 3427 * hold bond->lock without bh disabled because we'll 3428 * deadlock. The only solution is to rely on the fact 3429 * that we're under rtnl_lock here, and the slaves 3430 * list won't change. This doesn't solve the problem 3431 * of setting the slave's MTU while it is 3432 * transmitting, but the assumption is that the base 3433 * driver can handle that. 3434 * 3435 * TODO: figure out a way to safely iterate the slaves 3436 * list, but without holding a lock around the actual 3437 * call to the base driver. 3438 */ 3439 3440 bond_for_each_slave(bond, slave, iter) { 3441 netdev_dbg(bond_dev, "s %p c_m %p\n", 3442 slave, slave->dev->netdev_ops->ndo_change_mtu); 3443 3444 res = dev_set_mtu(slave->dev, new_mtu); 3445 3446 if (res) { 3447 /* If we failed to set the slave's mtu to the new value 3448 * we must abort the operation even in ACTIVE_BACKUP 3449 * mode, because if we allow the backup slaves to have 3450 * different mtu values than the active slave we'll 3451 * need to change their mtu when doing a failover. That 3452 * means changing their mtu from timer context, which 3453 * is probably not a good idea. 3454 */ 3455 netdev_dbg(bond_dev, "err %d %s\n", res, 3456 slave->dev->name); 3457 goto unwind; 3458 } 3459 } 3460 3461 bond_dev->mtu = new_mtu; 3462 3463 return 0; 3464 3465 unwind: 3466 /* unwind from head to the slave that failed */ 3467 bond_for_each_slave(bond, rollback_slave, iter) { 3468 int tmp_res; 3469 3470 if (rollback_slave == slave) 3471 break; 3472 3473 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu); 3474 if (tmp_res) { 3475 netdev_dbg(bond_dev, "unwind err %d dev %s\n", 3476 tmp_res, rollback_slave->dev->name); 3477 } 3478 } 3479 3480 return res; 3481 } 3482 3483 /* 3484 * Change HW address 3485 * 3486 * Note that many devices must be down to change the HW address, and 3487 * downing the master releases all slaves. We can make bonds full of 3488 * bonding devices to test this, however. 3489 */ 3490 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 3491 { 3492 struct bonding *bond = netdev_priv(bond_dev); 3493 struct slave *slave, *rollback_slave; 3494 struct sockaddr *sa = addr, tmp_sa; 3495 struct list_head *iter; 3496 int res = 0; 3497 3498 if (BOND_MODE(bond) == BOND_MODE_ALB) 3499 return bond_alb_set_mac_address(bond_dev, addr); 3500 3501 3502 netdev_dbg(bond_dev, "bond=%p\n", bond); 3503 3504 /* If fail_over_mac is enabled, do nothing and return success. 3505 * Returning an error causes ifenslave to fail. 3506 */ 3507 if (bond->params.fail_over_mac && 3508 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3509 return 0; 3510 3511 if (!is_valid_ether_addr(sa->sa_data)) 3512 return -EADDRNOTAVAIL; 3513 3514 /* Can't hold bond->lock with bh disabled here since 3515 * some base drivers panic. On the other hand we can't 3516 * hold bond->lock without bh disabled because we'll 3517 * deadlock. The only solution is to rely on the fact 3518 * that we're under rtnl_lock here, and the slaves 3519 * list won't change. This doesn't solve the problem 3520 * of setting the slave's hw address while it is 3521 * transmitting, but the assumption is that the base 3522 * driver can handle that. 3523 * 3524 * TODO: figure out a way to safely iterate the slaves 3525 * list, but without holding a lock around the actual 3526 * call to the base driver. 3527 */ 3528 3529 bond_for_each_slave(bond, slave, iter) { 3530 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name); 3531 res = dev_set_mac_address(slave->dev, addr); 3532 if (res) { 3533 /* TODO: consider downing the slave 3534 * and retry ? 3535 * User should expect communications 3536 * breakage anyway until ARP finish 3537 * updating, so... 3538 */ 3539 netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name); 3540 goto unwind; 3541 } 3542 } 3543 3544 /* success */ 3545 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); 3546 return 0; 3547 3548 unwind: 3549 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 3550 tmp_sa.sa_family = bond_dev->type; 3551 3552 /* unwind from head to the slave that failed */ 3553 bond_for_each_slave(bond, rollback_slave, iter) { 3554 int tmp_res; 3555 3556 if (rollback_slave == slave) 3557 break; 3558 3559 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa); 3560 if (tmp_res) { 3561 netdev_dbg(bond_dev, "unwind err %d dev %s\n", 3562 tmp_res, rollback_slave->dev->name); 3563 } 3564 } 3565 3566 return res; 3567 } 3568 3569 /** 3570 * bond_xmit_slave_id - transmit skb through slave with slave_id 3571 * @bond: bonding device that is transmitting 3572 * @skb: buffer to transmit 3573 * @slave_id: slave id up to slave_cnt-1 through which to transmit 3574 * 3575 * This function tries to transmit through slave with slave_id but in case 3576 * it fails, it tries to find the first available slave for transmission. 3577 * The skb is consumed in all cases, thus the function is void. 3578 */ 3579 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id) 3580 { 3581 struct list_head *iter; 3582 struct slave *slave; 3583 int i = slave_id; 3584 3585 /* Here we start from the slave with slave_id */ 3586 bond_for_each_slave_rcu(bond, slave, iter) { 3587 if (--i < 0) { 3588 if (bond_slave_can_tx(slave)) { 3589 bond_dev_queue_xmit(bond, skb, slave->dev); 3590 return; 3591 } 3592 } 3593 } 3594 3595 /* Here we start from the first slave up to slave_id */ 3596 i = slave_id; 3597 bond_for_each_slave_rcu(bond, slave, iter) { 3598 if (--i < 0) 3599 break; 3600 if (bond_slave_can_tx(slave)) { 3601 bond_dev_queue_xmit(bond, skb, slave->dev); 3602 return; 3603 } 3604 } 3605 /* no slave that can tx has been found */ 3606 dev_kfree_skb_any(skb); 3607 } 3608 3609 /** 3610 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave 3611 * @bond: bonding device to use 3612 * 3613 * Based on the value of the bonding device's packets_per_slave parameter 3614 * this function generates a slave id, which is usually used as the next 3615 * slave to transmit through. 3616 */ 3617 static u32 bond_rr_gen_slave_id(struct bonding *bond) 3618 { 3619 u32 slave_id; 3620 struct reciprocal_value reciprocal_packets_per_slave; 3621 int packets_per_slave = bond->params.packets_per_slave; 3622 3623 switch (packets_per_slave) { 3624 case 0: 3625 slave_id = prandom_u32(); 3626 break; 3627 case 1: 3628 slave_id = bond->rr_tx_counter; 3629 break; 3630 default: 3631 reciprocal_packets_per_slave = 3632 bond->params.reciprocal_packets_per_slave; 3633 slave_id = reciprocal_divide(bond->rr_tx_counter, 3634 reciprocal_packets_per_slave); 3635 break; 3636 } 3637 bond->rr_tx_counter++; 3638 3639 return slave_id; 3640 } 3641 3642 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev) 3643 { 3644 struct bonding *bond = netdev_priv(bond_dev); 3645 struct iphdr *iph = ip_hdr(skb); 3646 struct slave *slave; 3647 u32 slave_id; 3648 3649 /* Start with the curr_active_slave that joined the bond as the 3650 * default for sending IGMP traffic. For failover purposes one 3651 * needs to maintain some consistency for the interface that will 3652 * send the join/membership reports. The curr_active_slave found 3653 * will send all of this type of traffic. 3654 */ 3655 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) { 3656 slave = rcu_dereference(bond->curr_active_slave); 3657 if (slave && bond_slave_can_tx(slave)) 3658 bond_dev_queue_xmit(bond, skb, slave->dev); 3659 else 3660 bond_xmit_slave_id(bond, skb, 0); 3661 } else { 3662 int slave_cnt = ACCESS_ONCE(bond->slave_cnt); 3663 3664 if (likely(slave_cnt)) { 3665 slave_id = bond_rr_gen_slave_id(bond); 3666 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt); 3667 } else { 3668 dev_kfree_skb_any(skb); 3669 } 3670 } 3671 3672 return NETDEV_TX_OK; 3673 } 3674 3675 /* 3676 * in active-backup mode, we know that bond->curr_active_slave is always valid if 3677 * the bond has a usable interface. 3678 */ 3679 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev) 3680 { 3681 struct bonding *bond = netdev_priv(bond_dev); 3682 struct slave *slave; 3683 3684 slave = rcu_dereference(bond->curr_active_slave); 3685 if (slave) 3686 bond_dev_queue_xmit(bond, skb, slave->dev); 3687 else 3688 dev_kfree_skb_any(skb); 3689 3690 return NETDEV_TX_OK; 3691 } 3692 3693 /* In bond_xmit_xor() , we determine the output device by using a pre- 3694 * determined xmit_hash_policy(), If the selected device is not enabled, 3695 * find the next active slave. 3696 */ 3697 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev) 3698 { 3699 struct bonding *bond = netdev_priv(bond_dev); 3700 int slave_cnt = ACCESS_ONCE(bond->slave_cnt); 3701 3702 if (likely(slave_cnt)) 3703 bond_xmit_slave_id(bond, skb, 3704 bond_xmit_hash(bond, skb) % slave_cnt); 3705 else 3706 dev_kfree_skb_any(skb); 3707 3708 return NETDEV_TX_OK; 3709 } 3710 3711 /* in broadcast mode, we send everything to all usable interfaces. */ 3712 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev) 3713 { 3714 struct bonding *bond = netdev_priv(bond_dev); 3715 struct slave *slave = NULL; 3716 struct list_head *iter; 3717 3718 bond_for_each_slave_rcu(bond, slave, iter) { 3719 if (bond_is_last_slave(bond, slave)) 3720 break; 3721 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 3722 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 3723 3724 if (!skb2) { 3725 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n", 3726 bond_dev->name, __func__); 3727 continue; 3728 } 3729 /* bond_dev_queue_xmit always returns 0 */ 3730 bond_dev_queue_xmit(bond, skb2, slave->dev); 3731 } 3732 } 3733 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) 3734 bond_dev_queue_xmit(bond, skb, slave->dev); 3735 else 3736 dev_kfree_skb_any(skb); 3737 3738 return NETDEV_TX_OK; 3739 } 3740 3741 /*------------------------- Device initialization ---------------------------*/ 3742 3743 /* 3744 * Lookup the slave that corresponds to a qid 3745 */ 3746 static inline int bond_slave_override(struct bonding *bond, 3747 struct sk_buff *skb) 3748 { 3749 struct slave *slave = NULL; 3750 struct list_head *iter; 3751 3752 if (!skb->queue_mapping) 3753 return 1; 3754 3755 /* Find out if any slaves have the same mapping as this skb. */ 3756 bond_for_each_slave_rcu(bond, slave, iter) { 3757 if (slave->queue_id == skb->queue_mapping) { 3758 if (bond_slave_can_tx(slave)) { 3759 bond_dev_queue_xmit(bond, skb, slave->dev); 3760 return 0; 3761 } 3762 /* If the slave isn't UP, use default transmit policy. */ 3763 break; 3764 } 3765 } 3766 3767 return 1; 3768 } 3769 3770 3771 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb, 3772 void *accel_priv, select_queue_fallback_t fallback) 3773 { 3774 /* 3775 * This helper function exists to help dev_pick_tx get the correct 3776 * destination queue. Using a helper function skips a call to 3777 * skb_tx_hash and will put the skbs in the queue we expect on their 3778 * way down to the bonding driver. 3779 */ 3780 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 3781 3782 /* 3783 * Save the original txq to restore before passing to the driver 3784 */ 3785 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping; 3786 3787 if (unlikely(txq >= dev->real_num_tx_queues)) { 3788 do { 3789 txq -= dev->real_num_tx_queues; 3790 } while (txq >= dev->real_num_tx_queues); 3791 } 3792 return txq; 3793 } 3794 3795 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 3796 { 3797 struct bonding *bond = netdev_priv(dev); 3798 3799 if (bond_should_override_tx_queue(bond) && 3800 !bond_slave_override(bond, skb)) 3801 return NETDEV_TX_OK; 3802 3803 switch (BOND_MODE(bond)) { 3804 case BOND_MODE_ROUNDROBIN: 3805 return bond_xmit_roundrobin(skb, dev); 3806 case BOND_MODE_ACTIVEBACKUP: 3807 return bond_xmit_activebackup(skb, dev); 3808 case BOND_MODE_XOR: 3809 return bond_xmit_xor(skb, dev); 3810 case BOND_MODE_BROADCAST: 3811 return bond_xmit_broadcast(skb, dev); 3812 case BOND_MODE_8023AD: 3813 return bond_3ad_xmit_xor(skb, dev); 3814 case BOND_MODE_ALB: 3815 return bond_alb_xmit(skb, dev); 3816 case BOND_MODE_TLB: 3817 return bond_tlb_xmit(skb, dev); 3818 default: 3819 /* Should never happen, mode already checked */ 3820 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond)); 3821 WARN_ON_ONCE(1); 3822 dev_kfree_skb_any(skb); 3823 return NETDEV_TX_OK; 3824 } 3825 } 3826 3827 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 3828 { 3829 struct bonding *bond = netdev_priv(dev); 3830 netdev_tx_t ret = NETDEV_TX_OK; 3831 3832 /* 3833 * If we risk deadlock from transmitting this in the 3834 * netpoll path, tell netpoll to queue the frame for later tx 3835 */ 3836 if (unlikely(is_netpoll_tx_blocked(dev))) 3837 return NETDEV_TX_BUSY; 3838 3839 rcu_read_lock(); 3840 if (bond_has_slaves(bond)) 3841 ret = __bond_start_xmit(skb, dev); 3842 else 3843 dev_kfree_skb_any(skb); 3844 rcu_read_unlock(); 3845 3846 return ret; 3847 } 3848 3849 static int bond_ethtool_get_settings(struct net_device *bond_dev, 3850 struct ethtool_cmd *ecmd) 3851 { 3852 struct bonding *bond = netdev_priv(bond_dev); 3853 unsigned long speed = 0; 3854 struct list_head *iter; 3855 struct slave *slave; 3856 3857 ecmd->duplex = DUPLEX_UNKNOWN; 3858 ecmd->port = PORT_OTHER; 3859 3860 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we 3861 * do not need to check mode. Though link speed might not represent 3862 * the true receive or transmit bandwidth (not all modes are symmetric) 3863 * this is an accurate maximum. 3864 */ 3865 read_lock(&bond->lock); 3866 bond_for_each_slave(bond, slave, iter) { 3867 if (bond_slave_can_tx(slave)) { 3868 if (slave->speed != SPEED_UNKNOWN) 3869 speed += slave->speed; 3870 if (ecmd->duplex == DUPLEX_UNKNOWN && 3871 slave->duplex != DUPLEX_UNKNOWN) 3872 ecmd->duplex = slave->duplex; 3873 } 3874 } 3875 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN); 3876 read_unlock(&bond->lock); 3877 3878 return 0; 3879 } 3880 3881 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 3882 struct ethtool_drvinfo *drvinfo) 3883 { 3884 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver)); 3885 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version)); 3886 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d", 3887 BOND_ABI_VERSION); 3888 } 3889 3890 static const struct ethtool_ops bond_ethtool_ops = { 3891 .get_drvinfo = bond_ethtool_get_drvinfo, 3892 .get_settings = bond_ethtool_get_settings, 3893 .get_link = ethtool_op_get_link, 3894 }; 3895 3896 static const struct net_device_ops bond_netdev_ops = { 3897 .ndo_init = bond_init, 3898 .ndo_uninit = bond_uninit, 3899 .ndo_open = bond_open, 3900 .ndo_stop = bond_close, 3901 .ndo_start_xmit = bond_start_xmit, 3902 .ndo_select_queue = bond_select_queue, 3903 .ndo_get_stats64 = bond_get_stats, 3904 .ndo_do_ioctl = bond_do_ioctl, 3905 .ndo_change_rx_flags = bond_change_rx_flags, 3906 .ndo_set_rx_mode = bond_set_rx_mode, 3907 .ndo_change_mtu = bond_change_mtu, 3908 .ndo_set_mac_address = bond_set_mac_address, 3909 .ndo_neigh_setup = bond_neigh_setup, 3910 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 3911 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 3912 #ifdef CONFIG_NET_POLL_CONTROLLER 3913 .ndo_netpoll_setup = bond_netpoll_setup, 3914 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 3915 .ndo_poll_controller = bond_poll_controller, 3916 #endif 3917 .ndo_add_slave = bond_enslave, 3918 .ndo_del_slave = bond_release, 3919 .ndo_fix_features = bond_fix_features, 3920 }; 3921 3922 static const struct device_type bond_type = { 3923 .name = "bond", 3924 }; 3925 3926 static void bond_destructor(struct net_device *bond_dev) 3927 { 3928 struct bonding *bond = netdev_priv(bond_dev); 3929 if (bond->wq) 3930 destroy_workqueue(bond->wq); 3931 free_netdev(bond_dev); 3932 } 3933 3934 void bond_setup(struct net_device *bond_dev) 3935 { 3936 struct bonding *bond = netdev_priv(bond_dev); 3937 3938 /* initialize rwlocks */ 3939 rwlock_init(&bond->lock); 3940 rwlock_init(&bond->curr_slave_lock); 3941 bond->params = bonding_defaults; 3942 3943 /* Initialize pointers */ 3944 bond->dev = bond_dev; 3945 3946 /* Initialize the device entry points */ 3947 ether_setup(bond_dev); 3948 bond_dev->netdev_ops = &bond_netdev_ops; 3949 bond_dev->ethtool_ops = &bond_ethtool_ops; 3950 3951 bond_dev->destructor = bond_destructor; 3952 3953 SET_NETDEV_DEVTYPE(bond_dev, &bond_type); 3954 3955 /* Initialize the device options */ 3956 bond_dev->tx_queue_len = 0; 3957 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST; 3958 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT; 3959 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 3960 3961 /* don't acquire bond device's netif_tx_lock when 3962 * transmitting */ 3963 bond_dev->features |= NETIF_F_LLTX; 3964 3965 /* By default, we declare the bond to be fully 3966 * VLAN hardware accelerated capable. Special 3967 * care is taken in the various xmit functions 3968 * when there are slaves that are not hw accel 3969 * capable 3970 */ 3971 3972 /* Don't allow bond devices to change network namespaces. */ 3973 bond_dev->features |= NETIF_F_NETNS_LOCAL; 3974 3975 bond_dev->hw_features = BOND_VLAN_FEATURES | 3976 NETIF_F_HW_VLAN_CTAG_TX | 3977 NETIF_F_HW_VLAN_CTAG_RX | 3978 NETIF_F_HW_VLAN_CTAG_FILTER; 3979 3980 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM); 3981 bond_dev->hw_features |= NETIF_F_GSO_UDP_TUNNEL; 3982 bond_dev->features |= bond_dev->hw_features; 3983 } 3984 3985 /* 3986 * Destroy a bonding device. 3987 * Must be under rtnl_lock when this function is called. 3988 */ 3989 static void bond_uninit(struct net_device *bond_dev) 3990 { 3991 struct bonding *bond = netdev_priv(bond_dev); 3992 struct list_head *iter; 3993 struct slave *slave; 3994 3995 bond_netpoll_cleanup(bond_dev); 3996 3997 /* Release the bonded slaves */ 3998 bond_for_each_slave(bond, slave, iter) 3999 __bond_release_one(bond_dev, slave->dev, true); 4000 netdev_info(bond_dev, "Released all slaves\n"); 4001 4002 list_del(&bond->bond_list); 4003 4004 bond_debug_unregister(bond); 4005 } 4006 4007 /*------------------------- Module initialization ---------------------------*/ 4008 4009 static int bond_check_params(struct bond_params *params) 4010 { 4011 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i; 4012 struct bond_opt_value newval; 4013 const struct bond_opt_value *valptr; 4014 int arp_all_targets_value; 4015 4016 /* 4017 * Convert string parameters. 4018 */ 4019 if (mode) { 4020 bond_opt_initstr(&newval, mode); 4021 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval); 4022 if (!valptr) { 4023 pr_err("Error: Invalid bonding mode \"%s\"\n", mode); 4024 return -EINVAL; 4025 } 4026 bond_mode = valptr->value; 4027 } 4028 4029 if (xmit_hash_policy) { 4030 if ((bond_mode != BOND_MODE_XOR) && 4031 (bond_mode != BOND_MODE_8023AD) && 4032 (bond_mode != BOND_MODE_TLB)) { 4033 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 4034 bond_mode_name(bond_mode)); 4035 } else { 4036 bond_opt_initstr(&newval, xmit_hash_policy); 4037 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH), 4038 &newval); 4039 if (!valptr) { 4040 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 4041 xmit_hash_policy); 4042 return -EINVAL; 4043 } 4044 xmit_hashtype = valptr->value; 4045 } 4046 } 4047 4048 if (lacp_rate) { 4049 if (bond_mode != BOND_MODE_8023AD) { 4050 pr_info("lacp_rate param is irrelevant in mode %s\n", 4051 bond_mode_name(bond_mode)); 4052 } else { 4053 bond_opt_initstr(&newval, lacp_rate); 4054 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE), 4055 &newval); 4056 if (!valptr) { 4057 pr_err("Error: Invalid lacp rate \"%s\"\n", 4058 lacp_rate); 4059 return -EINVAL; 4060 } 4061 lacp_fast = valptr->value; 4062 } 4063 } 4064 4065 if (ad_select) { 4066 bond_opt_initstr(&newval, ad_select); 4067 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT), 4068 &newval); 4069 if (!valptr) { 4070 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select); 4071 return -EINVAL; 4072 } 4073 params->ad_select = valptr->value; 4074 if (bond_mode != BOND_MODE_8023AD) 4075 pr_warn("ad_select param only affects 802.3ad mode\n"); 4076 } else { 4077 params->ad_select = BOND_AD_STABLE; 4078 } 4079 4080 if (max_bonds < 0) { 4081 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 4082 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 4083 max_bonds = BOND_DEFAULT_MAX_BONDS; 4084 } 4085 4086 if (miimon < 0) { 4087 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4088 miimon, INT_MAX); 4089 miimon = 0; 4090 } 4091 4092 if (updelay < 0) { 4093 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4094 updelay, INT_MAX); 4095 updelay = 0; 4096 } 4097 4098 if (downdelay < 0) { 4099 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4100 downdelay, INT_MAX); 4101 downdelay = 0; 4102 } 4103 4104 if ((use_carrier != 0) && (use_carrier != 1)) { 4105 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 4106 use_carrier); 4107 use_carrier = 1; 4108 } 4109 4110 if (num_peer_notif < 0 || num_peer_notif > 255) { 4111 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 4112 num_peer_notif); 4113 num_peer_notif = 1; 4114 } 4115 4116 /* reset values for 802.3ad/TLB/ALB */ 4117 if (!bond_mode_uses_arp(bond_mode)) { 4118 if (!miimon) { 4119 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"); 4120 pr_warn("Forcing miimon to 100msec\n"); 4121 miimon = BOND_DEFAULT_MIIMON; 4122 } 4123 } 4124 4125 if (tx_queues < 1 || tx_queues > 255) { 4126 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n", 4127 tx_queues, BOND_DEFAULT_TX_QUEUES); 4128 tx_queues = BOND_DEFAULT_TX_QUEUES; 4129 } 4130 4131 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 4132 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n", 4133 all_slaves_active); 4134 all_slaves_active = 0; 4135 } 4136 4137 if (resend_igmp < 0 || resend_igmp > 255) { 4138 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n", 4139 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 4140 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 4141 } 4142 4143 bond_opt_initval(&newval, packets_per_slave); 4144 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) { 4145 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n", 4146 packets_per_slave, USHRT_MAX); 4147 packets_per_slave = 1; 4148 } 4149 4150 if (bond_mode == BOND_MODE_ALB) { 4151 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", 4152 updelay); 4153 } 4154 4155 if (!miimon) { 4156 if (updelay || downdelay) { 4157 /* just warn the user the up/down delay will have 4158 * no effect since miimon is zero... 4159 */ 4160 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", 4161 updelay, downdelay); 4162 } 4163 } else { 4164 /* don't allow arp monitoring */ 4165 if (arp_interval) { 4166 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 4167 miimon, arp_interval); 4168 arp_interval = 0; 4169 } 4170 4171 if ((updelay % miimon) != 0) { 4172 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 4173 updelay, miimon, (updelay / miimon) * miimon); 4174 } 4175 4176 updelay /= miimon; 4177 4178 if ((downdelay % miimon) != 0) { 4179 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 4180 downdelay, miimon, 4181 (downdelay / miimon) * miimon); 4182 } 4183 4184 downdelay /= miimon; 4185 } 4186 4187 if (arp_interval < 0) { 4188 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4189 arp_interval, INT_MAX); 4190 arp_interval = 0; 4191 } 4192 4193 for (arp_ip_count = 0, i = 0; 4194 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) { 4195 /* not complete check, but should be good enough to 4196 catch mistakes */ 4197 __be32 ip; 4198 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) || 4199 !bond_is_ip_target_ok(ip)) { 4200 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 4201 arp_ip_target[i]); 4202 arp_interval = 0; 4203 } else { 4204 if (bond_get_targets_ip(arp_target, ip) == -1) 4205 arp_target[arp_ip_count++] = ip; 4206 else 4207 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n", 4208 &ip); 4209 } 4210 } 4211 4212 if (arp_interval && !arp_ip_count) { 4213 /* don't allow arping if no arp_ip_target given... */ 4214 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 4215 arp_interval); 4216 arp_interval = 0; 4217 } 4218 4219 if (arp_validate) { 4220 if (!arp_interval) { 4221 pr_err("arp_validate requires arp_interval\n"); 4222 return -EINVAL; 4223 } 4224 4225 bond_opt_initstr(&newval, arp_validate); 4226 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE), 4227 &newval); 4228 if (!valptr) { 4229 pr_err("Error: invalid arp_validate \"%s\"\n", 4230 arp_validate); 4231 return -EINVAL; 4232 } 4233 arp_validate_value = valptr->value; 4234 } else { 4235 arp_validate_value = 0; 4236 } 4237 4238 arp_all_targets_value = 0; 4239 if (arp_all_targets) { 4240 bond_opt_initstr(&newval, arp_all_targets); 4241 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS), 4242 &newval); 4243 if (!valptr) { 4244 pr_err("Error: invalid arp_all_targets_value \"%s\"\n", 4245 arp_all_targets); 4246 arp_all_targets_value = 0; 4247 } else { 4248 arp_all_targets_value = valptr->value; 4249 } 4250 } 4251 4252 if (miimon) { 4253 pr_info("MII link monitoring set to %d ms\n", miimon); 4254 } else if (arp_interval) { 4255 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE, 4256 arp_validate_value); 4257 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 4258 arp_interval, valptr->string, arp_ip_count); 4259 4260 for (i = 0; i < arp_ip_count; i++) 4261 pr_cont(" %s", arp_ip_target[i]); 4262 4263 pr_cont("\n"); 4264 4265 } else if (max_bonds) { 4266 /* miimon and arp_interval not set, we need one so things 4267 * work as expected, see bonding.txt for details 4268 */ 4269 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"); 4270 } 4271 4272 if (primary && !bond_mode_uses_primary(bond_mode)) { 4273 /* currently, using a primary only makes sense 4274 * in active backup, TLB or ALB modes 4275 */ 4276 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n", 4277 primary, bond_mode_name(bond_mode)); 4278 primary = NULL; 4279 } 4280 4281 if (primary && primary_reselect) { 4282 bond_opt_initstr(&newval, primary_reselect); 4283 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT), 4284 &newval); 4285 if (!valptr) { 4286 pr_err("Error: Invalid primary_reselect \"%s\"\n", 4287 primary_reselect); 4288 return -EINVAL; 4289 } 4290 primary_reselect_value = valptr->value; 4291 } else { 4292 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 4293 } 4294 4295 if (fail_over_mac) { 4296 bond_opt_initstr(&newval, fail_over_mac); 4297 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC), 4298 &newval); 4299 if (!valptr) { 4300 pr_err("Error: invalid fail_over_mac \"%s\"\n", 4301 fail_over_mac); 4302 return -EINVAL; 4303 } 4304 fail_over_mac_value = valptr->value; 4305 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 4306 pr_warn("Warning: fail_over_mac only affects active-backup mode\n"); 4307 } else { 4308 fail_over_mac_value = BOND_FOM_NONE; 4309 } 4310 4311 if (lp_interval == 0) { 4312 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n", 4313 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL); 4314 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 4315 } 4316 4317 /* fill params struct with the proper values */ 4318 params->mode = bond_mode; 4319 params->xmit_policy = xmit_hashtype; 4320 params->miimon = miimon; 4321 params->num_peer_notif = num_peer_notif; 4322 params->arp_interval = arp_interval; 4323 params->arp_validate = arp_validate_value; 4324 params->arp_all_targets = arp_all_targets_value; 4325 params->updelay = updelay; 4326 params->downdelay = downdelay; 4327 params->use_carrier = use_carrier; 4328 params->lacp_fast = lacp_fast; 4329 params->primary[0] = 0; 4330 params->primary_reselect = primary_reselect_value; 4331 params->fail_over_mac = fail_over_mac_value; 4332 params->tx_queues = tx_queues; 4333 params->all_slaves_active = all_slaves_active; 4334 params->resend_igmp = resend_igmp; 4335 params->min_links = min_links; 4336 params->lp_interval = lp_interval; 4337 params->packets_per_slave = packets_per_slave; 4338 params->tlb_dynamic_lb = 1; /* Default value */ 4339 if (packets_per_slave > 0) { 4340 params->reciprocal_packets_per_slave = 4341 reciprocal_value(packets_per_slave); 4342 } else { 4343 /* reciprocal_packets_per_slave is unused if 4344 * packets_per_slave is 0 or 1, just initialize it 4345 */ 4346 params->reciprocal_packets_per_slave = 4347 (struct reciprocal_value) { 0 }; 4348 } 4349 4350 if (primary) { 4351 strncpy(params->primary, primary, IFNAMSIZ); 4352 params->primary[IFNAMSIZ - 1] = 0; 4353 } 4354 4355 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 4356 4357 return 0; 4358 } 4359 4360 static struct lock_class_key bonding_netdev_xmit_lock_key; 4361 static struct lock_class_key bonding_netdev_addr_lock_key; 4362 static struct lock_class_key bonding_tx_busylock_key; 4363 4364 static void bond_set_lockdep_class_one(struct net_device *dev, 4365 struct netdev_queue *txq, 4366 void *_unused) 4367 { 4368 lockdep_set_class(&txq->_xmit_lock, 4369 &bonding_netdev_xmit_lock_key); 4370 } 4371 4372 static void bond_set_lockdep_class(struct net_device *dev) 4373 { 4374 lockdep_set_class(&dev->addr_list_lock, 4375 &bonding_netdev_addr_lock_key); 4376 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL); 4377 dev->qdisc_tx_busylock = &bonding_tx_busylock_key; 4378 } 4379 4380 /* 4381 * Called from registration process 4382 */ 4383 static int bond_init(struct net_device *bond_dev) 4384 { 4385 struct bonding *bond = netdev_priv(bond_dev); 4386 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 4387 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); 4388 4389 netdev_dbg(bond_dev, "Begin bond_init\n"); 4390 4391 /* 4392 * Initialize locks that may be required during 4393 * en/deslave operations. All of the bond_open work 4394 * (of which this is part) should really be moved to 4395 * a phase prior to dev_open 4396 */ 4397 spin_lock_init(&(bond_info->tx_hashtbl_lock)); 4398 spin_lock_init(&(bond_info->rx_hashtbl_lock)); 4399 4400 bond->wq = create_singlethread_workqueue(bond_dev->name); 4401 if (!bond->wq) 4402 return -ENOMEM; 4403 4404 bond_set_lockdep_class(bond_dev); 4405 4406 list_add_tail(&bond->bond_list, &bn->dev_list); 4407 4408 bond_prepare_sysfs_group(bond); 4409 4410 bond_debug_register(bond); 4411 4412 /* Ensure valid dev_addr */ 4413 if (is_zero_ether_addr(bond_dev->dev_addr) && 4414 bond_dev->addr_assign_type == NET_ADDR_PERM) 4415 eth_hw_addr_random(bond_dev); 4416 4417 return 0; 4418 } 4419 4420 unsigned int bond_get_num_tx_queues(void) 4421 { 4422 return tx_queues; 4423 } 4424 4425 /* Create a new bond based on the specified name and bonding parameters. 4426 * If name is NULL, obtain a suitable "bond%d" name for us. 4427 * Caller must NOT hold rtnl_lock; we need to release it here before we 4428 * set up our sysfs entries. 4429 */ 4430 int bond_create(struct net *net, const char *name) 4431 { 4432 struct net_device *bond_dev; 4433 int res; 4434 4435 rtnl_lock(); 4436 4437 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 4438 name ? name : "bond%d", NET_NAME_UNKNOWN, 4439 bond_setup, tx_queues); 4440 if (!bond_dev) { 4441 pr_err("%s: eek! can't alloc netdev!\n", name); 4442 rtnl_unlock(); 4443 return -ENOMEM; 4444 } 4445 4446 dev_net_set(bond_dev, net); 4447 bond_dev->rtnl_link_ops = &bond_link_ops; 4448 4449 res = register_netdevice(bond_dev); 4450 4451 netif_carrier_off(bond_dev); 4452 4453 rtnl_unlock(); 4454 if (res < 0) 4455 bond_destructor(bond_dev); 4456 return res; 4457 } 4458 4459 static int __net_init bond_net_init(struct net *net) 4460 { 4461 struct bond_net *bn = net_generic(net, bond_net_id); 4462 4463 bn->net = net; 4464 INIT_LIST_HEAD(&bn->dev_list); 4465 4466 bond_create_proc_dir(bn); 4467 bond_create_sysfs(bn); 4468 4469 return 0; 4470 } 4471 4472 static void __net_exit bond_net_exit(struct net *net) 4473 { 4474 struct bond_net *bn = net_generic(net, bond_net_id); 4475 struct bonding *bond, *tmp_bond; 4476 LIST_HEAD(list); 4477 4478 bond_destroy_sysfs(bn); 4479 4480 /* Kill off any bonds created after unregistering bond rtnl ops */ 4481 rtnl_lock(); 4482 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list) 4483 unregister_netdevice_queue(bond->dev, &list); 4484 unregister_netdevice_many(&list); 4485 rtnl_unlock(); 4486 4487 bond_destroy_proc_dir(bn); 4488 } 4489 4490 static struct pernet_operations bond_net_ops = { 4491 .init = bond_net_init, 4492 .exit = bond_net_exit, 4493 .id = &bond_net_id, 4494 .size = sizeof(struct bond_net), 4495 }; 4496 4497 static int __init bonding_init(void) 4498 { 4499 int i; 4500 int res; 4501 4502 pr_info("%s", bond_version); 4503 4504 res = bond_check_params(&bonding_defaults); 4505 if (res) 4506 goto out; 4507 4508 res = register_pernet_subsys(&bond_net_ops); 4509 if (res) 4510 goto out; 4511 4512 res = bond_netlink_init(); 4513 if (res) 4514 goto err_link; 4515 4516 bond_create_debugfs(); 4517 4518 for (i = 0; i < max_bonds; i++) { 4519 res = bond_create(&init_net, NULL); 4520 if (res) 4521 goto err; 4522 } 4523 4524 register_netdevice_notifier(&bond_netdev_notifier); 4525 out: 4526 return res; 4527 err: 4528 bond_destroy_debugfs(); 4529 bond_netlink_fini(); 4530 err_link: 4531 unregister_pernet_subsys(&bond_net_ops); 4532 goto out; 4533 4534 } 4535 4536 static void __exit bonding_exit(void) 4537 { 4538 unregister_netdevice_notifier(&bond_netdev_notifier); 4539 4540 bond_destroy_debugfs(); 4541 4542 bond_netlink_fini(); 4543 unregister_pernet_subsys(&bond_net_ops); 4544 4545 #ifdef CONFIG_NET_POLL_CONTROLLER 4546 /* 4547 * Make sure we don't have an imbalance on our netpoll blocking 4548 */ 4549 WARN_ON(atomic_read(&netpoll_block_tx)); 4550 #endif 4551 } 4552 4553 module_init(bonding_init); 4554 module_exit(bonding_exit); 4555 MODULE_LICENSE("GPL"); 4556 MODULE_VERSION(DRV_VERSION); 4557 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION); 4558 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 4559