1 /* 2 * originally based on the dummy device. 3 * 4 * Copyright 1999, Thomas Davis, tadavis@lbl.gov. 5 * Licensed under the GPL. Based on dummy.c, and eql.c devices. 6 * 7 * bonding.c: an Ethernet Bonding driver 8 * 9 * This is useful to talk to a Cisco EtherChannel compatible equipment: 10 * Cisco 5500 11 * Sun Trunking (Solaris) 12 * Alteon AceDirector Trunks 13 * Linux Bonding 14 * and probably many L2 switches ... 15 * 16 * How it works: 17 * ifconfig bond0 ipaddress netmask up 18 * will setup a network device, with an ip address. No mac address 19 * will be assigned at this time. The hw mac address will come from 20 * the first slave bonded to the channel. All slaves will then use 21 * this hw mac address. 22 * 23 * ifconfig bond0 down 24 * will release all slaves, marking them as down. 25 * 26 * ifenslave bond0 eth0 27 * will attach eth0 to bond0 as a slave. eth0 hw mac address will either 28 * a: be used as initial mac address 29 * b: if a hw mac address already is there, eth0's hw mac address 30 * will then be set from bond0. 31 * 32 */ 33 34 #include <linux/kernel.h> 35 #include <linux/module.h> 36 #include <linux/types.h> 37 #include <linux/fcntl.h> 38 #include <linux/interrupt.h> 39 #include <linux/ptrace.h> 40 #include <linux/ioport.h> 41 #include <linux/in.h> 42 #include <net/ip.h> 43 #include <linux/ip.h> 44 #include <linux/tcp.h> 45 #include <linux/udp.h> 46 #include <linux/slab.h> 47 #include <linux/string.h> 48 #include <linux/init.h> 49 #include <linux/timer.h> 50 #include <linux/socket.h> 51 #include <linux/ctype.h> 52 #include <linux/inet.h> 53 #include <linux/bitops.h> 54 #include <linux/io.h> 55 #include <asm/dma.h> 56 #include <linux/uaccess.h> 57 #include <linux/errno.h> 58 #include <linux/netdevice.h> 59 #include <linux/inetdevice.h> 60 #include <linux/igmp.h> 61 #include <linux/etherdevice.h> 62 #include <linux/skbuff.h> 63 #include <net/sock.h> 64 #include <linux/rtnetlink.h> 65 #include <linux/smp.h> 66 #include <linux/if_ether.h> 67 #include <net/arp.h> 68 #include <linux/mii.h> 69 #include <linux/ethtool.h> 70 #include <linux/if_vlan.h> 71 #include <linux/if_bonding.h> 72 #include <linux/jiffies.h> 73 #include <linux/preempt.h> 74 #include <net/route.h> 75 #include <net/net_namespace.h> 76 #include <net/netns/generic.h> 77 #include <net/pkt_sched.h> 78 #include <linux/rculist.h> 79 #include <net/flow_dissector.h> 80 #include <net/switchdev.h> 81 #include <net/bonding.h> 82 #include <net/bond_3ad.h> 83 #include <net/bond_alb.h> 84 85 #include "bonding_priv.h" 86 87 /*---------------------------- Module parameters ----------------------------*/ 88 89 /* monitor all links that often (in milliseconds). <=0 disables monitoring */ 90 91 static int max_bonds = BOND_DEFAULT_MAX_BONDS; 92 static int tx_queues = BOND_DEFAULT_TX_QUEUES; 93 static int num_peer_notif = 1; 94 static int miimon; 95 static int updelay; 96 static int downdelay; 97 static int use_carrier = 1; 98 static char *mode; 99 static char *primary; 100 static char *primary_reselect; 101 static char *lacp_rate; 102 static int min_links; 103 static char *ad_select; 104 static char *xmit_hash_policy; 105 static int arp_interval; 106 static char *arp_ip_target[BOND_MAX_ARP_TARGETS]; 107 static char *arp_validate; 108 static char *arp_all_targets; 109 static char *fail_over_mac; 110 static int all_slaves_active; 111 static struct bond_params bonding_defaults; 112 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP; 113 static int packets_per_slave = 1; 114 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 115 116 module_param(max_bonds, int, 0); 117 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices"); 118 module_param(tx_queues, int, 0); 119 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)"); 120 module_param_named(num_grat_arp, num_peer_notif, int, 0644); 121 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on " 122 "failover event (alias of num_unsol_na)"); 123 module_param_named(num_unsol_na, num_peer_notif, int, 0644); 124 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on " 125 "failover event (alias of num_grat_arp)"); 126 module_param(miimon, int, 0); 127 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds"); 128 module_param(updelay, int, 0); 129 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds"); 130 module_param(downdelay, int, 0); 131 MODULE_PARM_DESC(downdelay, "Delay before considering link down, " 132 "in milliseconds"); 133 module_param(use_carrier, int, 0); 134 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; " 135 "0 for off, 1 for on (default)"); 136 module_param(mode, charp, 0); 137 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, " 138 "1 for active-backup, 2 for balance-xor, " 139 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, " 140 "6 for balance-alb"); 141 module_param(primary, charp, 0); 142 MODULE_PARM_DESC(primary, "Primary network device to use"); 143 module_param(primary_reselect, charp, 0); 144 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave " 145 "once it comes up; " 146 "0 for always (default), " 147 "1 for only if speed of primary is " 148 "better, " 149 "2 for only on active slave " 150 "failure"); 151 module_param(lacp_rate, charp, 0); 152 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; " 153 "0 for slow, 1 for fast"); 154 module_param(ad_select, charp, 0); 155 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; " 156 "0 for stable (default), 1 for bandwidth, " 157 "2 for count"); 158 module_param(min_links, int, 0); 159 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier"); 160 161 module_param(xmit_hash_policy, charp, 0); 162 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; " 163 "0 for layer 2 (default), 1 for layer 3+4, " 164 "2 for layer 2+3, 3 for encap layer 2+3, " 165 "4 for encap layer 3+4"); 166 module_param(arp_interval, int, 0); 167 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds"); 168 module_param_array(arp_ip_target, charp, NULL, 0); 169 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form"); 170 module_param(arp_validate, charp, 0); 171 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; " 172 "0 for none (default), 1 for active, " 173 "2 for backup, 3 for all"); 174 module_param(arp_all_targets, charp, 0); 175 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all"); 176 module_param(fail_over_mac, charp, 0); 177 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to " 178 "the same MAC; 0 for none (default), " 179 "1 for active, 2 for follow"); 180 module_param(all_slaves_active, int, 0); 181 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface " 182 "by setting active flag for all slaves; " 183 "0 for never (default), 1 for always."); 184 module_param(resend_igmp, int, 0); 185 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on " 186 "link failure"); 187 module_param(packets_per_slave, int, 0); 188 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr " 189 "mode; 0 for a random slave, 1 packet per " 190 "slave (default), >1 packets per slave."); 191 module_param(lp_interval, uint, 0); 192 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where " 193 "the bonding driver sends learning packets to " 194 "each slaves peer switch. The default is 1."); 195 196 /*----------------------------- Global variables ----------------------------*/ 197 198 #ifdef CONFIG_NET_POLL_CONTROLLER 199 atomic_t netpoll_block_tx = ATOMIC_INIT(0); 200 #endif 201 202 int bond_net_id __read_mostly; 203 204 static __be32 arp_target[BOND_MAX_ARP_TARGETS]; 205 static int arp_ip_count; 206 static int bond_mode = BOND_MODE_ROUNDROBIN; 207 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2; 208 static int lacp_fast; 209 210 /*-------------------------- Forward declarations ---------------------------*/ 211 212 static int bond_init(struct net_device *bond_dev); 213 static void bond_uninit(struct net_device *bond_dev); 214 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev, 215 struct rtnl_link_stats64 *stats); 216 static void bond_slave_arr_handler(struct work_struct *work); 217 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 218 int mod); 219 220 /*---------------------------- General routines -----------------------------*/ 221 222 const char *bond_mode_name(int mode) 223 { 224 static const char *names[] = { 225 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)", 226 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)", 227 [BOND_MODE_XOR] = "load balancing (xor)", 228 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)", 229 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation", 230 [BOND_MODE_TLB] = "transmit load balancing", 231 [BOND_MODE_ALB] = "adaptive load balancing", 232 }; 233 234 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB) 235 return "unknown"; 236 237 return names[mode]; 238 } 239 240 /*---------------------------------- VLAN -----------------------------------*/ 241 242 /** 243 * bond_dev_queue_xmit - Prepare skb for xmit. 244 * 245 * @bond: bond device that got this skb for tx. 246 * @skb: hw accel VLAN tagged skb to transmit 247 * @slave_dev: slave that is supposed to xmit this skbuff 248 */ 249 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, 250 struct net_device *slave_dev) 251 { 252 skb->dev = slave_dev; 253 254 BUILD_BUG_ON(sizeof(skb->queue_mapping) != 255 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping)); 256 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping; 257 258 if (unlikely(netpoll_tx_running(bond->dev))) 259 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb); 260 else 261 dev_queue_xmit(skb); 262 } 263 264 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid, 265 * We don't protect the slave list iteration with a lock because: 266 * a. This operation is performed in IOCTL context, 267 * b. The operation is protected by the RTNL semaphore in the 8021q code, 268 * c. Holding a lock with BH disabled while directly calling a base driver 269 * entry point is generally a BAD idea. 270 * 271 * The design of synchronization/protection for this operation in the 8021q 272 * module is good for one or more VLAN devices over a single physical device 273 * and cannot be extended for a teaming solution like bonding, so there is a 274 * potential race condition here where a net device from the vlan group might 275 * be referenced (either by a base driver or the 8021q code) while it is being 276 * removed from the system. However, it turns out we're not making matters 277 * worse, and if it works for regular VLAN usage it will work here too. 278 */ 279 280 /** 281 * bond_vlan_rx_add_vid - Propagates adding an id to slaves 282 * @bond_dev: bonding net device that got called 283 * @vid: vlan id being added 284 */ 285 static int bond_vlan_rx_add_vid(struct net_device *bond_dev, 286 __be16 proto, u16 vid) 287 { 288 struct bonding *bond = netdev_priv(bond_dev); 289 struct slave *slave, *rollback_slave; 290 struct list_head *iter; 291 int res; 292 293 bond_for_each_slave(bond, slave, iter) { 294 res = vlan_vid_add(slave->dev, proto, vid); 295 if (res) 296 goto unwind; 297 } 298 299 return 0; 300 301 unwind: 302 /* unwind to the slave that failed */ 303 bond_for_each_slave(bond, rollback_slave, iter) { 304 if (rollback_slave == slave) 305 break; 306 307 vlan_vid_del(rollback_slave->dev, proto, vid); 308 } 309 310 return res; 311 } 312 313 /** 314 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves 315 * @bond_dev: bonding net device that got called 316 * @vid: vlan id being removed 317 */ 318 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, 319 __be16 proto, u16 vid) 320 { 321 struct bonding *bond = netdev_priv(bond_dev); 322 struct list_head *iter; 323 struct slave *slave; 324 325 bond_for_each_slave(bond, slave, iter) 326 vlan_vid_del(slave->dev, proto, vid); 327 328 if (bond_is_lb(bond)) 329 bond_alb_clear_vlan(bond, vid); 330 331 return 0; 332 } 333 334 /*------------------------------- Link status -------------------------------*/ 335 336 /* Set the carrier state for the master according to the state of its 337 * slaves. If any slaves are up, the master is up. In 802.3ad mode, 338 * do special 802.3ad magic. 339 * 340 * Returns zero if carrier state does not change, nonzero if it does. 341 */ 342 int bond_set_carrier(struct bonding *bond) 343 { 344 struct list_head *iter; 345 struct slave *slave; 346 347 if (!bond_has_slaves(bond)) 348 goto down; 349 350 if (BOND_MODE(bond) == BOND_MODE_8023AD) 351 return bond_3ad_set_carrier(bond); 352 353 bond_for_each_slave(bond, slave, iter) { 354 if (slave->link == BOND_LINK_UP) { 355 if (!netif_carrier_ok(bond->dev)) { 356 netif_carrier_on(bond->dev); 357 return 1; 358 } 359 return 0; 360 } 361 } 362 363 down: 364 if (netif_carrier_ok(bond->dev)) { 365 netif_carrier_off(bond->dev); 366 return 1; 367 } 368 return 0; 369 } 370 371 /* Get link speed and duplex from the slave's base driver 372 * using ethtool. If for some reason the call fails or the 373 * values are invalid, set speed and duplex to -1, 374 * and return. 375 */ 376 static void bond_update_speed_duplex(struct slave *slave) 377 { 378 struct net_device *slave_dev = slave->dev; 379 struct ethtool_link_ksettings ecmd; 380 int res; 381 382 slave->speed = SPEED_UNKNOWN; 383 slave->duplex = DUPLEX_UNKNOWN; 384 385 res = __ethtool_get_link_ksettings(slave_dev, &ecmd); 386 if (res < 0) 387 return; 388 389 if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1)) 390 return; 391 392 switch (ecmd.base.duplex) { 393 case DUPLEX_FULL: 394 case DUPLEX_HALF: 395 break; 396 default: 397 return; 398 } 399 400 slave->speed = ecmd.base.speed; 401 slave->duplex = ecmd.base.duplex; 402 403 return; 404 } 405 406 const char *bond_slave_link_status(s8 link) 407 { 408 switch (link) { 409 case BOND_LINK_UP: 410 return "up"; 411 case BOND_LINK_FAIL: 412 return "going down"; 413 case BOND_LINK_DOWN: 414 return "down"; 415 case BOND_LINK_BACK: 416 return "going back"; 417 default: 418 return "unknown"; 419 } 420 } 421 422 /* if <dev> supports MII link status reporting, check its link status. 423 * 424 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), 425 * depending upon the setting of the use_carrier parameter. 426 * 427 * Return either BMSR_LSTATUS, meaning that the link is up (or we 428 * can't tell and just pretend it is), or 0, meaning that the link is 429 * down. 430 * 431 * If reporting is non-zero, instead of faking link up, return -1 if 432 * both ETHTOOL and MII ioctls fail (meaning the device does not 433 * support them). If use_carrier is set, return whatever it says. 434 * It'd be nice if there was a good way to tell if a driver supports 435 * netif_carrier, but there really isn't. 436 */ 437 static int bond_check_dev_link(struct bonding *bond, 438 struct net_device *slave_dev, int reporting) 439 { 440 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 441 int (*ioctl)(struct net_device *, struct ifreq *, int); 442 struct ifreq ifr; 443 struct mii_ioctl_data *mii; 444 445 if (!reporting && !netif_running(slave_dev)) 446 return 0; 447 448 if (bond->params.use_carrier) 449 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; 450 451 /* Try to get link status using Ethtool first. */ 452 if (slave_dev->ethtool_ops->get_link) 453 return slave_dev->ethtool_ops->get_link(slave_dev) ? 454 BMSR_LSTATUS : 0; 455 456 /* Ethtool can't be used, fallback to MII ioctls. */ 457 ioctl = slave_ops->ndo_do_ioctl; 458 if (ioctl) { 459 /* TODO: set pointer to correct ioctl on a per team member 460 * bases to make this more efficient. that is, once 461 * we determine the correct ioctl, we will always 462 * call it and not the others for that team 463 * member. 464 */ 465 466 /* We cannot assume that SIOCGMIIPHY will also read a 467 * register; not all network drivers (e.g., e100) 468 * support that. 469 */ 470 471 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ 472 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ); 473 mii = if_mii(&ifr); 474 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) { 475 mii->reg_num = MII_BMSR; 476 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) 477 return mii->val_out & BMSR_LSTATUS; 478 } 479 } 480 481 /* If reporting, report that either there's no dev->do_ioctl, 482 * or both SIOCGMIIREG and get_link failed (meaning that we 483 * cannot report link status). If not reporting, pretend 484 * we're ok. 485 */ 486 return reporting ? -1 : BMSR_LSTATUS; 487 } 488 489 /*----------------------------- Multicast list ------------------------------*/ 490 491 /* Push the promiscuity flag down to appropriate slaves */ 492 static int bond_set_promiscuity(struct bonding *bond, int inc) 493 { 494 struct list_head *iter; 495 int err = 0; 496 497 if (bond_uses_primary(bond)) { 498 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 499 500 if (curr_active) 501 err = dev_set_promiscuity(curr_active->dev, inc); 502 } else { 503 struct slave *slave; 504 505 bond_for_each_slave(bond, slave, iter) { 506 err = dev_set_promiscuity(slave->dev, inc); 507 if (err) 508 return err; 509 } 510 } 511 return err; 512 } 513 514 /* Push the allmulti flag down to all slaves */ 515 static int bond_set_allmulti(struct bonding *bond, int inc) 516 { 517 struct list_head *iter; 518 int err = 0; 519 520 if (bond_uses_primary(bond)) { 521 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 522 523 if (curr_active) 524 err = dev_set_allmulti(curr_active->dev, inc); 525 } else { 526 struct slave *slave; 527 528 bond_for_each_slave(bond, slave, iter) { 529 err = dev_set_allmulti(slave->dev, inc); 530 if (err) 531 return err; 532 } 533 } 534 return err; 535 } 536 537 /* Retrieve the list of registered multicast addresses for the bonding 538 * device and retransmit an IGMP JOIN request to the current active 539 * slave. 540 */ 541 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work) 542 { 543 struct bonding *bond = container_of(work, struct bonding, 544 mcast_work.work); 545 546 if (!rtnl_trylock()) { 547 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 548 return; 549 } 550 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev); 551 552 if (bond->igmp_retrans > 1) { 553 bond->igmp_retrans--; 554 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); 555 } 556 rtnl_unlock(); 557 } 558 559 /* Flush bond's hardware addresses from slave */ 560 static void bond_hw_addr_flush(struct net_device *bond_dev, 561 struct net_device *slave_dev) 562 { 563 struct bonding *bond = netdev_priv(bond_dev); 564 565 dev_uc_unsync(slave_dev, bond_dev); 566 dev_mc_unsync(slave_dev, bond_dev); 567 568 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 569 /* del lacpdu mc addr from mc list */ 570 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 571 572 dev_mc_del(slave_dev, lacpdu_multicast); 573 } 574 } 575 576 /*--------------------------- Active slave change ---------------------------*/ 577 578 /* Update the hardware address list and promisc/allmulti for the new and 579 * old active slaves (if any). Modes that are not using primary keep all 580 * slaves up date at all times; only the modes that use primary need to call 581 * this function to swap these settings during a failover. 582 */ 583 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active, 584 struct slave *old_active) 585 { 586 if (old_active) { 587 if (bond->dev->flags & IFF_PROMISC) 588 dev_set_promiscuity(old_active->dev, -1); 589 590 if (bond->dev->flags & IFF_ALLMULTI) 591 dev_set_allmulti(old_active->dev, -1); 592 593 bond_hw_addr_flush(bond->dev, old_active->dev); 594 } 595 596 if (new_active) { 597 /* FIXME: Signal errors upstream. */ 598 if (bond->dev->flags & IFF_PROMISC) 599 dev_set_promiscuity(new_active->dev, 1); 600 601 if (bond->dev->flags & IFF_ALLMULTI) 602 dev_set_allmulti(new_active->dev, 1); 603 604 netif_addr_lock_bh(bond->dev); 605 dev_uc_sync(new_active->dev, bond->dev); 606 dev_mc_sync(new_active->dev, bond->dev); 607 netif_addr_unlock_bh(bond->dev); 608 } 609 } 610 611 /** 612 * bond_set_dev_addr - clone slave's address to bond 613 * @bond_dev: bond net device 614 * @slave_dev: slave net device 615 * 616 * Should be called with RTNL held. 617 */ 618 static void bond_set_dev_addr(struct net_device *bond_dev, 619 struct net_device *slave_dev) 620 { 621 netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->name=%s slave_dev->addr_len=%d\n", 622 bond_dev, slave_dev, slave_dev->name, slave_dev->addr_len); 623 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len); 624 bond_dev->addr_assign_type = NET_ADDR_STOLEN; 625 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev); 626 } 627 628 static struct slave *bond_get_old_active(struct bonding *bond, 629 struct slave *new_active) 630 { 631 struct slave *slave; 632 struct list_head *iter; 633 634 bond_for_each_slave(bond, slave, iter) { 635 if (slave == new_active) 636 continue; 637 638 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr)) 639 return slave; 640 } 641 642 return NULL; 643 } 644 645 /* bond_do_fail_over_mac 646 * 647 * Perform special MAC address swapping for fail_over_mac settings 648 * 649 * Called with RTNL 650 */ 651 static void bond_do_fail_over_mac(struct bonding *bond, 652 struct slave *new_active, 653 struct slave *old_active) 654 { 655 u8 tmp_mac[ETH_ALEN]; 656 struct sockaddr saddr; 657 int rv; 658 659 switch (bond->params.fail_over_mac) { 660 case BOND_FOM_ACTIVE: 661 if (new_active) 662 bond_set_dev_addr(bond->dev, new_active->dev); 663 break; 664 case BOND_FOM_FOLLOW: 665 /* if new_active && old_active, swap them 666 * if just old_active, do nothing (going to no active slave) 667 * if just new_active, set new_active to bond's MAC 668 */ 669 if (!new_active) 670 return; 671 672 if (!old_active) 673 old_active = bond_get_old_active(bond, new_active); 674 675 if (old_active) { 676 ether_addr_copy(tmp_mac, new_active->dev->dev_addr); 677 ether_addr_copy(saddr.sa_data, 678 old_active->dev->dev_addr); 679 saddr.sa_family = new_active->dev->type; 680 } else { 681 ether_addr_copy(saddr.sa_data, bond->dev->dev_addr); 682 saddr.sa_family = bond->dev->type; 683 } 684 685 rv = dev_set_mac_address(new_active->dev, &saddr); 686 if (rv) { 687 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n", 688 -rv, new_active->dev->name); 689 goto out; 690 } 691 692 if (!old_active) 693 goto out; 694 695 ether_addr_copy(saddr.sa_data, tmp_mac); 696 saddr.sa_family = old_active->dev->type; 697 698 rv = dev_set_mac_address(old_active->dev, &saddr); 699 if (rv) 700 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n", 701 -rv, new_active->dev->name); 702 out: 703 break; 704 default: 705 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n", 706 bond->params.fail_over_mac); 707 break; 708 } 709 710 } 711 712 static struct slave *bond_choose_primary_or_current(struct bonding *bond) 713 { 714 struct slave *prim = rtnl_dereference(bond->primary_slave); 715 struct slave *curr = rtnl_dereference(bond->curr_active_slave); 716 717 if (!prim || prim->link != BOND_LINK_UP) { 718 if (!curr || curr->link != BOND_LINK_UP) 719 return NULL; 720 return curr; 721 } 722 723 if (bond->force_primary) { 724 bond->force_primary = false; 725 return prim; 726 } 727 728 if (!curr || curr->link != BOND_LINK_UP) 729 return prim; 730 731 /* At this point, prim and curr are both up */ 732 switch (bond->params.primary_reselect) { 733 case BOND_PRI_RESELECT_ALWAYS: 734 return prim; 735 case BOND_PRI_RESELECT_BETTER: 736 if (prim->speed < curr->speed) 737 return curr; 738 if (prim->speed == curr->speed && prim->duplex <= curr->duplex) 739 return curr; 740 return prim; 741 case BOND_PRI_RESELECT_FAILURE: 742 return curr; 743 default: 744 netdev_err(bond->dev, "impossible primary_reselect %d\n", 745 bond->params.primary_reselect); 746 return curr; 747 } 748 } 749 750 /** 751 * bond_find_best_slave - select the best available slave to be the active one 752 * @bond: our bonding struct 753 */ 754 static struct slave *bond_find_best_slave(struct bonding *bond) 755 { 756 struct slave *slave, *bestslave = NULL; 757 struct list_head *iter; 758 int mintime = bond->params.updelay; 759 760 slave = bond_choose_primary_or_current(bond); 761 if (slave) 762 return slave; 763 764 bond_for_each_slave(bond, slave, iter) { 765 if (slave->link == BOND_LINK_UP) 766 return slave; 767 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) && 768 slave->delay < mintime) { 769 mintime = slave->delay; 770 bestslave = slave; 771 } 772 } 773 774 return bestslave; 775 } 776 777 static bool bond_should_notify_peers(struct bonding *bond) 778 { 779 struct slave *slave; 780 781 rcu_read_lock(); 782 slave = rcu_dereference(bond->curr_active_slave); 783 rcu_read_unlock(); 784 785 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n", 786 slave ? slave->dev->name : "NULL"); 787 788 if (!slave || !bond->send_peer_notif || 789 !netif_carrier_ok(bond->dev) || 790 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) 791 return false; 792 793 return true; 794 } 795 796 /** 797 * change_active_interface - change the active slave into the specified one 798 * @bond: our bonding struct 799 * @new: the new slave to make the active one 800 * 801 * Set the new slave to the bond's settings and unset them on the old 802 * curr_active_slave. 803 * Setting include flags, mc-list, promiscuity, allmulti, etc. 804 * 805 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, 806 * because it is apparently the best available slave we have, even though its 807 * updelay hasn't timed out yet. 808 * 809 * Caller must hold RTNL. 810 */ 811 void bond_change_active_slave(struct bonding *bond, struct slave *new_active) 812 { 813 struct slave *old_active; 814 815 ASSERT_RTNL(); 816 817 old_active = rtnl_dereference(bond->curr_active_slave); 818 819 if (old_active == new_active) 820 return; 821 822 if (new_active) { 823 new_active->last_link_up = jiffies; 824 825 if (new_active->link == BOND_LINK_BACK) { 826 if (bond_uses_primary(bond)) { 827 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n", 828 new_active->dev->name, 829 (bond->params.updelay - new_active->delay) * bond->params.miimon); 830 } 831 832 new_active->delay = 0; 833 bond_set_slave_link_state(new_active, BOND_LINK_UP, 834 BOND_SLAVE_NOTIFY_NOW); 835 836 if (BOND_MODE(bond) == BOND_MODE_8023AD) 837 bond_3ad_handle_link_change(new_active, BOND_LINK_UP); 838 839 if (bond_is_lb(bond)) 840 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); 841 } else { 842 if (bond_uses_primary(bond)) { 843 netdev_info(bond->dev, "making interface %s the new active one\n", 844 new_active->dev->name); 845 } 846 } 847 } 848 849 if (bond_uses_primary(bond)) 850 bond_hw_addr_swap(bond, new_active, old_active); 851 852 if (bond_is_lb(bond)) { 853 bond_alb_handle_active_change(bond, new_active); 854 if (old_active) 855 bond_set_slave_inactive_flags(old_active, 856 BOND_SLAVE_NOTIFY_NOW); 857 if (new_active) 858 bond_set_slave_active_flags(new_active, 859 BOND_SLAVE_NOTIFY_NOW); 860 } else { 861 rcu_assign_pointer(bond->curr_active_slave, new_active); 862 } 863 864 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) { 865 if (old_active) 866 bond_set_slave_inactive_flags(old_active, 867 BOND_SLAVE_NOTIFY_NOW); 868 869 if (new_active) { 870 bool should_notify_peers = false; 871 872 bond_set_slave_active_flags(new_active, 873 BOND_SLAVE_NOTIFY_NOW); 874 875 if (bond->params.fail_over_mac) 876 bond_do_fail_over_mac(bond, new_active, 877 old_active); 878 879 if (netif_running(bond->dev)) { 880 bond->send_peer_notif = 881 bond->params.num_peer_notif; 882 should_notify_peers = 883 bond_should_notify_peers(bond); 884 } 885 886 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev); 887 if (should_notify_peers) 888 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 889 bond->dev); 890 } 891 } 892 893 /* resend IGMP joins since active slave has changed or 894 * all were sent on curr_active_slave. 895 * resend only if bond is brought up with the affected 896 * bonding modes and the retransmission is enabled 897 */ 898 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && 899 ((bond_uses_primary(bond) && new_active) || 900 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) { 901 bond->igmp_retrans = bond->params.resend_igmp; 902 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 903 } 904 } 905 906 /** 907 * bond_select_active_slave - select a new active slave, if needed 908 * @bond: our bonding struct 909 * 910 * This functions should be called when one of the following occurs: 911 * - The old curr_active_slave has been released or lost its link. 912 * - The primary_slave has got its link back. 913 * - A slave has got its link back and there's no old curr_active_slave. 914 * 915 * Caller must hold RTNL. 916 */ 917 void bond_select_active_slave(struct bonding *bond) 918 { 919 struct slave *best_slave; 920 int rv; 921 922 ASSERT_RTNL(); 923 924 best_slave = bond_find_best_slave(bond); 925 if (best_slave != rtnl_dereference(bond->curr_active_slave)) { 926 bond_change_active_slave(bond, best_slave); 927 rv = bond_set_carrier(bond); 928 if (!rv) 929 return; 930 931 if (netif_carrier_ok(bond->dev)) 932 netdev_info(bond->dev, "first active interface up!\n"); 933 else 934 netdev_info(bond->dev, "now running without any active interface!\n"); 935 } 936 } 937 938 #ifdef CONFIG_NET_POLL_CONTROLLER 939 static inline int slave_enable_netpoll(struct slave *slave) 940 { 941 struct netpoll *np; 942 int err = 0; 943 944 np = kzalloc(sizeof(*np), GFP_KERNEL); 945 err = -ENOMEM; 946 if (!np) 947 goto out; 948 949 err = __netpoll_setup(np, slave->dev); 950 if (err) { 951 kfree(np); 952 goto out; 953 } 954 slave->np = np; 955 out: 956 return err; 957 } 958 static inline void slave_disable_netpoll(struct slave *slave) 959 { 960 struct netpoll *np = slave->np; 961 962 if (!np) 963 return; 964 965 slave->np = NULL; 966 __netpoll_free_async(np); 967 } 968 969 static void bond_poll_controller(struct net_device *bond_dev) 970 { 971 struct bonding *bond = netdev_priv(bond_dev); 972 struct slave *slave = NULL; 973 struct list_head *iter; 974 struct ad_info ad_info; 975 struct netpoll_info *ni; 976 const struct net_device_ops *ops; 977 978 if (BOND_MODE(bond) == BOND_MODE_8023AD) 979 if (bond_3ad_get_active_agg_info(bond, &ad_info)) 980 return; 981 982 bond_for_each_slave_rcu(bond, slave, iter) { 983 ops = slave->dev->netdev_ops; 984 if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller) 985 continue; 986 987 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 988 struct aggregator *agg = 989 SLAVE_AD_INFO(slave)->port.aggregator; 990 991 if (agg && 992 agg->aggregator_identifier != ad_info.aggregator_id) 993 continue; 994 } 995 996 ni = rcu_dereference_bh(slave->dev->npinfo); 997 if (down_trylock(&ni->dev_lock)) 998 continue; 999 ops->ndo_poll_controller(slave->dev); 1000 up(&ni->dev_lock); 1001 } 1002 } 1003 1004 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1005 { 1006 struct bonding *bond = netdev_priv(bond_dev); 1007 struct list_head *iter; 1008 struct slave *slave; 1009 1010 bond_for_each_slave(bond, slave, iter) 1011 if (bond_slave_is_up(slave)) 1012 slave_disable_netpoll(slave); 1013 } 1014 1015 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) 1016 { 1017 struct bonding *bond = netdev_priv(dev); 1018 struct list_head *iter; 1019 struct slave *slave; 1020 int err = 0; 1021 1022 bond_for_each_slave(bond, slave, iter) { 1023 err = slave_enable_netpoll(slave); 1024 if (err) { 1025 bond_netpoll_cleanup(dev); 1026 break; 1027 } 1028 } 1029 return err; 1030 } 1031 #else 1032 static inline int slave_enable_netpoll(struct slave *slave) 1033 { 1034 return 0; 1035 } 1036 static inline void slave_disable_netpoll(struct slave *slave) 1037 { 1038 } 1039 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1040 { 1041 } 1042 #endif 1043 1044 /*---------------------------------- IOCTL ----------------------------------*/ 1045 1046 static netdev_features_t bond_fix_features(struct net_device *dev, 1047 netdev_features_t features) 1048 { 1049 struct bonding *bond = netdev_priv(dev); 1050 struct list_head *iter; 1051 netdev_features_t mask; 1052 struct slave *slave; 1053 1054 mask = features; 1055 1056 features &= ~NETIF_F_ONE_FOR_ALL; 1057 features |= NETIF_F_ALL_FOR_ALL; 1058 1059 bond_for_each_slave(bond, slave, iter) { 1060 features = netdev_increment_features(features, 1061 slave->dev->features, 1062 mask); 1063 } 1064 features = netdev_add_tso_features(features, mask); 1065 1066 return features; 1067 } 1068 1069 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1070 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \ 1071 NETIF_F_HIGHDMA | NETIF_F_LRO) 1072 1073 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1074 NETIF_F_RXCSUM | NETIF_F_ALL_TSO) 1075 1076 static void bond_compute_features(struct bonding *bond) 1077 { 1078 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE | 1079 IFF_XMIT_DST_RELEASE_PERM; 1080 netdev_features_t vlan_features = BOND_VLAN_FEATURES; 1081 netdev_features_t enc_features = BOND_ENC_FEATURES; 1082 struct net_device *bond_dev = bond->dev; 1083 struct list_head *iter; 1084 struct slave *slave; 1085 unsigned short max_hard_header_len = ETH_HLEN; 1086 unsigned int gso_max_size = GSO_MAX_SIZE; 1087 u16 gso_max_segs = GSO_MAX_SEGS; 1088 1089 if (!bond_has_slaves(bond)) 1090 goto done; 1091 vlan_features &= NETIF_F_ALL_FOR_ALL; 1092 1093 bond_for_each_slave(bond, slave, iter) { 1094 vlan_features = netdev_increment_features(vlan_features, 1095 slave->dev->vlan_features, BOND_VLAN_FEATURES); 1096 1097 enc_features = netdev_increment_features(enc_features, 1098 slave->dev->hw_enc_features, 1099 BOND_ENC_FEATURES); 1100 dst_release_flag &= slave->dev->priv_flags; 1101 if (slave->dev->hard_header_len > max_hard_header_len) 1102 max_hard_header_len = slave->dev->hard_header_len; 1103 1104 gso_max_size = min(gso_max_size, slave->dev->gso_max_size); 1105 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs); 1106 } 1107 1108 done: 1109 bond_dev->vlan_features = vlan_features; 1110 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL; 1111 bond_dev->hard_header_len = max_hard_header_len; 1112 bond_dev->gso_max_segs = gso_max_segs; 1113 netif_set_gso_max_size(bond_dev, gso_max_size); 1114 1115 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1116 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) && 1117 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM)) 1118 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE; 1119 1120 netdev_change_features(bond_dev); 1121 } 1122 1123 static void bond_setup_by_slave(struct net_device *bond_dev, 1124 struct net_device *slave_dev) 1125 { 1126 bond_dev->header_ops = slave_dev->header_ops; 1127 1128 bond_dev->type = slave_dev->type; 1129 bond_dev->hard_header_len = slave_dev->hard_header_len; 1130 bond_dev->addr_len = slave_dev->addr_len; 1131 1132 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1133 slave_dev->addr_len); 1134 } 1135 1136 /* On bonding slaves other than the currently active slave, suppress 1137 * duplicates except for alb non-mcast/bcast. 1138 */ 1139 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1140 struct slave *slave, 1141 struct bonding *bond) 1142 { 1143 if (bond_is_slave_inactive(slave)) { 1144 if (BOND_MODE(bond) == BOND_MODE_ALB && 1145 skb->pkt_type != PACKET_BROADCAST && 1146 skb->pkt_type != PACKET_MULTICAST) 1147 return false; 1148 return true; 1149 } 1150 return false; 1151 } 1152 1153 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1154 { 1155 struct sk_buff *skb = *pskb; 1156 struct slave *slave; 1157 struct bonding *bond; 1158 int (*recv_probe)(const struct sk_buff *, struct bonding *, 1159 struct slave *); 1160 int ret = RX_HANDLER_ANOTHER; 1161 1162 skb = skb_share_check(skb, GFP_ATOMIC); 1163 if (unlikely(!skb)) 1164 return RX_HANDLER_CONSUMED; 1165 1166 *pskb = skb; 1167 1168 slave = bond_slave_get_rcu(skb->dev); 1169 bond = slave->bond; 1170 1171 recv_probe = ACCESS_ONCE(bond->recv_probe); 1172 if (recv_probe) { 1173 ret = recv_probe(skb, bond, slave); 1174 if (ret == RX_HANDLER_CONSUMED) { 1175 consume_skb(skb); 1176 return ret; 1177 } 1178 } 1179 1180 if (bond_should_deliver_exact_match(skb, slave, bond)) 1181 return RX_HANDLER_EXACT; 1182 1183 skb->dev = bond->dev; 1184 1185 if (BOND_MODE(bond) == BOND_MODE_ALB && 1186 bond->dev->priv_flags & IFF_BRIDGE_PORT && 1187 skb->pkt_type == PACKET_HOST) { 1188 1189 if (unlikely(skb_cow_head(skb, 1190 skb->data - skb_mac_header(skb)))) { 1191 kfree_skb(skb); 1192 return RX_HANDLER_CONSUMED; 1193 } 1194 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr); 1195 } 1196 1197 return ret; 1198 } 1199 1200 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond) 1201 { 1202 switch (BOND_MODE(bond)) { 1203 case BOND_MODE_ROUNDROBIN: 1204 return NETDEV_LAG_TX_TYPE_ROUNDROBIN; 1205 case BOND_MODE_ACTIVEBACKUP: 1206 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP; 1207 case BOND_MODE_BROADCAST: 1208 return NETDEV_LAG_TX_TYPE_BROADCAST; 1209 case BOND_MODE_XOR: 1210 case BOND_MODE_8023AD: 1211 return NETDEV_LAG_TX_TYPE_HASH; 1212 default: 1213 return NETDEV_LAG_TX_TYPE_UNKNOWN; 1214 } 1215 } 1216 1217 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave) 1218 { 1219 struct netdev_lag_upper_info lag_upper_info; 1220 int err; 1221 1222 lag_upper_info.tx_type = bond_lag_tx_type(bond); 1223 err = netdev_master_upper_dev_link(slave->dev, bond->dev, slave, 1224 &lag_upper_info); 1225 if (err) 1226 return err; 1227 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL); 1228 return 0; 1229 } 1230 1231 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave) 1232 { 1233 netdev_upper_dev_unlink(slave->dev, bond->dev); 1234 slave->dev->flags &= ~IFF_SLAVE; 1235 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL); 1236 } 1237 1238 static struct slave *bond_alloc_slave(struct bonding *bond) 1239 { 1240 struct slave *slave = NULL; 1241 1242 slave = kzalloc(sizeof(*slave), GFP_KERNEL); 1243 if (!slave) 1244 return NULL; 1245 1246 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1247 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info), 1248 GFP_KERNEL); 1249 if (!SLAVE_AD_INFO(slave)) { 1250 kfree(slave); 1251 return NULL; 1252 } 1253 } 1254 return slave; 1255 } 1256 1257 static void bond_free_slave(struct slave *slave) 1258 { 1259 struct bonding *bond = bond_get_bond_by_slave(slave); 1260 1261 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1262 kfree(SLAVE_AD_INFO(slave)); 1263 1264 kfree(slave); 1265 } 1266 1267 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info) 1268 { 1269 info->bond_mode = BOND_MODE(bond); 1270 info->miimon = bond->params.miimon; 1271 info->num_slaves = bond->slave_cnt; 1272 } 1273 1274 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info) 1275 { 1276 strcpy(info->slave_name, slave->dev->name); 1277 info->link = slave->link; 1278 info->state = bond_slave_state(slave); 1279 info->link_failure_count = slave->link_failure_count; 1280 } 1281 1282 static void bond_netdev_notify(struct net_device *dev, 1283 struct netdev_bonding_info *info) 1284 { 1285 rtnl_lock(); 1286 netdev_bonding_info_change(dev, info); 1287 rtnl_unlock(); 1288 } 1289 1290 static void bond_netdev_notify_work(struct work_struct *_work) 1291 { 1292 struct netdev_notify_work *w = 1293 container_of(_work, struct netdev_notify_work, work.work); 1294 1295 bond_netdev_notify(w->dev, &w->bonding_info); 1296 dev_put(w->dev); 1297 kfree(w); 1298 } 1299 1300 void bond_queue_slave_event(struct slave *slave) 1301 { 1302 struct bonding *bond = slave->bond; 1303 struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC); 1304 1305 if (!nnw) 1306 return; 1307 1308 dev_hold(slave->dev); 1309 nnw->dev = slave->dev; 1310 bond_fill_ifslave(slave, &nnw->bonding_info.slave); 1311 bond_fill_ifbond(bond, &nnw->bonding_info.master); 1312 INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work); 1313 1314 queue_delayed_work(slave->bond->wq, &nnw->work, 0); 1315 } 1316 1317 void bond_lower_state_changed(struct slave *slave) 1318 { 1319 struct netdev_lag_lower_state_info info; 1320 1321 info.link_up = slave->link == BOND_LINK_UP || 1322 slave->link == BOND_LINK_FAIL; 1323 info.tx_enabled = bond_is_active_slave(slave); 1324 netdev_lower_state_changed(slave->dev, &info); 1325 } 1326 1327 /* enslave device <slave> to bond device <master> */ 1328 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev) 1329 { 1330 struct bonding *bond = netdev_priv(bond_dev); 1331 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1332 struct slave *new_slave = NULL, *prev_slave; 1333 struct sockaddr addr; 1334 int link_reporting; 1335 int res = 0, i; 1336 1337 if (!bond->params.use_carrier && 1338 slave_dev->ethtool_ops->get_link == NULL && 1339 slave_ops->ndo_do_ioctl == NULL) { 1340 netdev_warn(bond_dev, "no link monitoring support for %s\n", 1341 slave_dev->name); 1342 } 1343 1344 /* already enslaved */ 1345 if (slave_dev->flags & IFF_SLAVE) { 1346 netdev_dbg(bond_dev, "Error: Device was already enslaved\n"); 1347 return -EBUSY; 1348 } 1349 1350 if (bond_dev == slave_dev) { 1351 netdev_err(bond_dev, "cannot enslave bond to itself.\n"); 1352 return -EPERM; 1353 } 1354 1355 /* vlan challenged mutual exclusion */ 1356 /* no need to lock since we're protected by rtnl_lock */ 1357 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1358 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n", 1359 slave_dev->name); 1360 if (vlan_uses_dev(bond_dev)) { 1361 netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n", 1362 slave_dev->name, bond_dev->name); 1363 return -EPERM; 1364 } else { 1365 netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n", 1366 slave_dev->name, slave_dev->name, 1367 bond_dev->name); 1368 } 1369 } else { 1370 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n", 1371 slave_dev->name); 1372 } 1373 1374 /* Old ifenslave binaries are no longer supported. These can 1375 * be identified with moderate accuracy by the state of the slave: 1376 * the current ifenslave will set the interface down prior to 1377 * enslaving it; the old ifenslave will not. 1378 */ 1379 if (slave_dev->flags & IFF_UP) { 1380 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n", 1381 slave_dev->name); 1382 return -EPERM; 1383 } 1384 1385 /* set bonding device ether type by slave - bonding netdevices are 1386 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1387 * there is a need to override some of the type dependent attribs/funcs. 1388 * 1389 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1390 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1391 */ 1392 if (!bond_has_slaves(bond)) { 1393 if (bond_dev->type != slave_dev->type) { 1394 netdev_dbg(bond_dev, "change device type from %d to %d\n", 1395 bond_dev->type, slave_dev->type); 1396 1397 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, 1398 bond_dev); 1399 res = notifier_to_errno(res); 1400 if (res) { 1401 netdev_err(bond_dev, "refused to change device type\n"); 1402 return -EBUSY; 1403 } 1404 1405 /* Flush unicast and multicast addresses */ 1406 dev_uc_flush(bond_dev); 1407 dev_mc_flush(bond_dev); 1408 1409 if (slave_dev->type != ARPHRD_ETHER) 1410 bond_setup_by_slave(bond_dev, slave_dev); 1411 else { 1412 ether_setup(bond_dev); 1413 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1414 } 1415 1416 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, 1417 bond_dev); 1418 } 1419 } else if (bond_dev->type != slave_dev->type) { 1420 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n", 1421 slave_dev->name, slave_dev->type, bond_dev->type); 1422 return -EINVAL; 1423 } 1424 1425 if (slave_ops->ndo_set_mac_address == NULL) { 1426 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n"); 1427 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP && 1428 bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1429 if (!bond_has_slaves(bond)) { 1430 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1431 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n"); 1432 } else { 1433 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"); 1434 res = -EOPNOTSUPP; 1435 goto err_undo_flags; 1436 } 1437 } 1438 } 1439 1440 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1441 1442 /* If this is the first slave, then we need to set the master's hardware 1443 * address to be the same as the slave's. 1444 */ 1445 if (!bond_has_slaves(bond) && 1446 bond->dev->addr_assign_type == NET_ADDR_RANDOM) 1447 bond_set_dev_addr(bond->dev, slave_dev); 1448 1449 new_slave = bond_alloc_slave(bond); 1450 if (!new_slave) { 1451 res = -ENOMEM; 1452 goto err_undo_flags; 1453 } 1454 1455 new_slave->bond = bond; 1456 new_slave->dev = slave_dev; 1457 /* Set the new_slave's queue_id to be zero. Queue ID mapping 1458 * is set via sysfs or module option if desired. 1459 */ 1460 new_slave->queue_id = 0; 1461 1462 /* Save slave's original mtu and then set it to match the bond */ 1463 new_slave->original_mtu = slave_dev->mtu; 1464 res = dev_set_mtu(slave_dev, bond->dev->mtu); 1465 if (res) { 1466 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res); 1467 goto err_free; 1468 } 1469 1470 /* Save slave's original ("permanent") mac address for modes 1471 * that need it, and for restoring it upon release, and then 1472 * set it to the master's address 1473 */ 1474 ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr); 1475 1476 if (!bond->params.fail_over_mac || 1477 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1478 /* Set slave to master's mac address. The application already 1479 * set the master's mac address to that of the first slave 1480 */ 1481 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 1482 addr.sa_family = slave_dev->type; 1483 res = dev_set_mac_address(slave_dev, &addr); 1484 if (res) { 1485 netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res); 1486 goto err_restore_mtu; 1487 } 1488 } 1489 1490 /* set slave flag before open to prevent IPv6 addrconf */ 1491 slave_dev->flags |= IFF_SLAVE; 1492 1493 /* open the slave since the application closed it */ 1494 res = dev_open(slave_dev); 1495 if (res) { 1496 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name); 1497 goto err_restore_mac; 1498 } 1499 1500 slave_dev->priv_flags |= IFF_BONDING; 1501 /* initialize slave stats */ 1502 dev_get_stats(new_slave->dev, &new_slave->slave_stats); 1503 1504 if (bond_is_lb(bond)) { 1505 /* bond_alb_init_slave() must be called before all other stages since 1506 * it might fail and we do not want to have to undo everything 1507 */ 1508 res = bond_alb_init_slave(bond, new_slave); 1509 if (res) 1510 goto err_close; 1511 } 1512 1513 /* If the mode uses primary, then the following is handled by 1514 * bond_change_active_slave(). 1515 */ 1516 if (!bond_uses_primary(bond)) { 1517 /* set promiscuity level to new slave */ 1518 if (bond_dev->flags & IFF_PROMISC) { 1519 res = dev_set_promiscuity(slave_dev, 1); 1520 if (res) 1521 goto err_close; 1522 } 1523 1524 /* set allmulti level to new slave */ 1525 if (bond_dev->flags & IFF_ALLMULTI) { 1526 res = dev_set_allmulti(slave_dev, 1); 1527 if (res) 1528 goto err_close; 1529 } 1530 1531 netif_addr_lock_bh(bond_dev); 1532 1533 dev_mc_sync_multiple(slave_dev, bond_dev); 1534 dev_uc_sync_multiple(slave_dev, bond_dev); 1535 1536 netif_addr_unlock_bh(bond_dev); 1537 } 1538 1539 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1540 /* add lacpdu mc addr to mc list */ 1541 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 1542 1543 dev_mc_add(slave_dev, lacpdu_multicast); 1544 } 1545 1546 res = vlan_vids_add_by_dev(slave_dev, bond_dev); 1547 if (res) { 1548 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n", 1549 slave_dev->name); 1550 goto err_close; 1551 } 1552 1553 prev_slave = bond_last_slave(bond); 1554 1555 new_slave->delay = 0; 1556 new_slave->link_failure_count = 0; 1557 1558 bond_update_speed_duplex(new_slave); 1559 1560 new_slave->last_rx = jiffies - 1561 (msecs_to_jiffies(bond->params.arp_interval) + 1); 1562 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) 1563 new_slave->target_last_arp_rx[i] = new_slave->last_rx; 1564 1565 if (bond->params.miimon && !bond->params.use_carrier) { 1566 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 1567 1568 if ((link_reporting == -1) && !bond->params.arp_interval) { 1569 /* miimon is set but a bonded network driver 1570 * does not support ETHTOOL/MII and 1571 * arp_interval is not set. Note: if 1572 * use_carrier is enabled, we will never go 1573 * here (because netif_carrier is always 1574 * supported); thus, we don't need to change 1575 * the messages for netif_carrier. 1576 */ 1577 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", 1578 slave_dev->name); 1579 } else if (link_reporting == -1) { 1580 /* unable get link status using mii/ethtool */ 1581 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", 1582 slave_dev->name); 1583 } 1584 } 1585 1586 /* check for initial state */ 1587 new_slave->link = BOND_LINK_NOCHANGE; 1588 if (bond->params.miimon) { 1589 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { 1590 if (bond->params.updelay) { 1591 bond_set_slave_link_state(new_slave, 1592 BOND_LINK_BACK, 1593 BOND_SLAVE_NOTIFY_NOW); 1594 new_slave->delay = bond->params.updelay; 1595 } else { 1596 bond_set_slave_link_state(new_slave, 1597 BOND_LINK_UP, 1598 BOND_SLAVE_NOTIFY_NOW); 1599 } 1600 } else { 1601 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN, 1602 BOND_SLAVE_NOTIFY_NOW); 1603 } 1604 } else if (bond->params.arp_interval) { 1605 bond_set_slave_link_state(new_slave, 1606 (netif_carrier_ok(slave_dev) ? 1607 BOND_LINK_UP : BOND_LINK_DOWN), 1608 BOND_SLAVE_NOTIFY_NOW); 1609 } else { 1610 bond_set_slave_link_state(new_slave, BOND_LINK_UP, 1611 BOND_SLAVE_NOTIFY_NOW); 1612 } 1613 1614 if (new_slave->link != BOND_LINK_DOWN) 1615 new_slave->last_link_up = jiffies; 1616 netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n", 1617 new_slave->link == BOND_LINK_DOWN ? "DOWN" : 1618 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); 1619 1620 if (bond_uses_primary(bond) && bond->params.primary[0]) { 1621 /* if there is a primary slave, remember it */ 1622 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 1623 rcu_assign_pointer(bond->primary_slave, new_slave); 1624 bond->force_primary = true; 1625 } 1626 } 1627 1628 switch (BOND_MODE(bond)) { 1629 case BOND_MODE_ACTIVEBACKUP: 1630 bond_set_slave_inactive_flags(new_slave, 1631 BOND_SLAVE_NOTIFY_NOW); 1632 break; 1633 case BOND_MODE_8023AD: 1634 /* in 802.3ad mode, the internal mechanism 1635 * will activate the slaves in the selected 1636 * aggregator 1637 */ 1638 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 1639 /* if this is the first slave */ 1640 if (!prev_slave) { 1641 SLAVE_AD_INFO(new_slave)->id = 1; 1642 /* Initialize AD with the number of times that the AD timer is called in 1 second 1643 * can be called only after the mac address of the bond is set 1644 */ 1645 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL); 1646 } else { 1647 SLAVE_AD_INFO(new_slave)->id = 1648 SLAVE_AD_INFO(prev_slave)->id + 1; 1649 } 1650 1651 bond_3ad_bind_slave(new_slave); 1652 break; 1653 case BOND_MODE_TLB: 1654 case BOND_MODE_ALB: 1655 bond_set_active_slave(new_slave); 1656 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 1657 break; 1658 default: 1659 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n"); 1660 1661 /* always active in trunk mode */ 1662 bond_set_active_slave(new_slave); 1663 1664 /* In trunking mode there is little meaning to curr_active_slave 1665 * anyway (it holds no special properties of the bond device), 1666 * so we can change it without calling change_active_interface() 1667 */ 1668 if (!rcu_access_pointer(bond->curr_active_slave) && 1669 new_slave->link == BOND_LINK_UP) 1670 rcu_assign_pointer(bond->curr_active_slave, new_slave); 1671 1672 break; 1673 } /* switch(bond_mode) */ 1674 1675 #ifdef CONFIG_NET_POLL_CONTROLLER 1676 slave_dev->npinfo = bond->dev->npinfo; 1677 if (slave_dev->npinfo) { 1678 if (slave_enable_netpoll(new_slave)) { 1679 netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n"); 1680 res = -EBUSY; 1681 goto err_detach; 1682 } 1683 } 1684 #endif 1685 1686 if (!(bond_dev->features & NETIF_F_LRO)) 1687 dev_disable_lro(slave_dev); 1688 1689 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 1690 new_slave); 1691 if (res) { 1692 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res); 1693 goto err_detach; 1694 } 1695 1696 res = bond_master_upper_dev_link(bond, new_slave); 1697 if (res) { 1698 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res); 1699 goto err_unregister; 1700 } 1701 1702 res = bond_sysfs_slave_add(new_slave); 1703 if (res) { 1704 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res); 1705 goto err_upper_unlink; 1706 } 1707 1708 bond->slave_cnt++; 1709 bond_compute_features(bond); 1710 bond_set_carrier(bond); 1711 1712 if (bond_uses_primary(bond)) { 1713 block_netpoll_tx(); 1714 bond_select_active_slave(bond); 1715 unblock_netpoll_tx(); 1716 } 1717 1718 if (bond_mode_uses_xmit_hash(bond)) 1719 bond_update_slave_arr(bond, NULL); 1720 1721 netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n", 1722 slave_dev->name, 1723 bond_is_active_slave(new_slave) ? "an active" : "a backup", 1724 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down"); 1725 1726 /* enslave is successful */ 1727 bond_queue_slave_event(new_slave); 1728 return 0; 1729 1730 /* Undo stages on error */ 1731 err_upper_unlink: 1732 bond_upper_dev_unlink(bond, new_slave); 1733 1734 err_unregister: 1735 netdev_rx_handler_unregister(slave_dev); 1736 1737 err_detach: 1738 if (!bond_uses_primary(bond)) 1739 bond_hw_addr_flush(bond_dev, slave_dev); 1740 1741 vlan_vids_del_by_dev(slave_dev, bond_dev); 1742 if (rcu_access_pointer(bond->primary_slave) == new_slave) 1743 RCU_INIT_POINTER(bond->primary_slave, NULL); 1744 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) { 1745 block_netpoll_tx(); 1746 bond_change_active_slave(bond, NULL); 1747 bond_select_active_slave(bond); 1748 unblock_netpoll_tx(); 1749 } 1750 /* either primary_slave or curr_active_slave might've changed */ 1751 synchronize_rcu(); 1752 slave_disable_netpoll(new_slave); 1753 1754 err_close: 1755 slave_dev->priv_flags &= ~IFF_BONDING; 1756 dev_close(slave_dev); 1757 1758 err_restore_mac: 1759 slave_dev->flags &= ~IFF_SLAVE; 1760 if (!bond->params.fail_over_mac || 1761 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1762 /* XXX TODO - fom follow mode needs to change master's 1763 * MAC if this slave's MAC is in use by the bond, or at 1764 * least print a warning. 1765 */ 1766 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr); 1767 addr.sa_family = slave_dev->type; 1768 dev_set_mac_address(slave_dev, &addr); 1769 } 1770 1771 err_restore_mtu: 1772 dev_set_mtu(slave_dev, new_slave->original_mtu); 1773 1774 err_free: 1775 bond_free_slave(new_slave); 1776 1777 err_undo_flags: 1778 /* Enslave of first slave has failed and we need to fix master's mac */ 1779 if (!bond_has_slaves(bond)) { 1780 if (ether_addr_equal_64bits(bond_dev->dev_addr, 1781 slave_dev->dev_addr)) 1782 eth_hw_addr_random(bond_dev); 1783 if (bond_dev->type != ARPHRD_ETHER) { 1784 dev_close(bond_dev); 1785 ether_setup(bond_dev); 1786 bond_dev->flags |= IFF_MASTER; 1787 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1788 } 1789 } 1790 1791 return res; 1792 } 1793 1794 /* Try to release the slave device <slave> from the bond device <master> 1795 * It is legal to access curr_active_slave without a lock because all the function 1796 * is RTNL-locked. If "all" is true it means that the function is being called 1797 * while destroying a bond interface and all slaves are being released. 1798 * 1799 * The rules for slave state should be: 1800 * for Active/Backup: 1801 * Active stays on all backups go down 1802 * for Bonded connections: 1803 * The first up interface should be left on and all others downed. 1804 */ 1805 static int __bond_release_one(struct net_device *bond_dev, 1806 struct net_device *slave_dev, 1807 bool all) 1808 { 1809 struct bonding *bond = netdev_priv(bond_dev); 1810 struct slave *slave, *oldcurrent; 1811 struct sockaddr addr; 1812 int old_flags = bond_dev->flags; 1813 netdev_features_t old_features = bond_dev->features; 1814 1815 /* slave is not a slave or master is not master of this slave */ 1816 if (!(slave_dev->flags & IFF_SLAVE) || 1817 !netdev_has_upper_dev(slave_dev, bond_dev)) { 1818 netdev_dbg(bond_dev, "cannot release %s\n", 1819 slave_dev->name); 1820 return -EINVAL; 1821 } 1822 1823 block_netpoll_tx(); 1824 1825 slave = bond_get_slave_by_dev(bond, slave_dev); 1826 if (!slave) { 1827 /* not a slave of this bond */ 1828 netdev_info(bond_dev, "%s not enslaved\n", 1829 slave_dev->name); 1830 unblock_netpoll_tx(); 1831 return -EINVAL; 1832 } 1833 1834 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW); 1835 1836 bond_sysfs_slave_del(slave); 1837 1838 /* recompute stats just before removing the slave */ 1839 bond_get_stats(bond->dev, &bond->bond_stats); 1840 1841 bond_upper_dev_unlink(bond, slave); 1842 /* unregister rx_handler early so bond_handle_frame wouldn't be called 1843 * for this slave anymore. 1844 */ 1845 netdev_rx_handler_unregister(slave_dev); 1846 1847 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1848 bond_3ad_unbind_slave(slave); 1849 1850 if (bond_mode_uses_xmit_hash(bond)) 1851 bond_update_slave_arr(bond, slave); 1852 1853 netdev_info(bond_dev, "Releasing %s interface %s\n", 1854 bond_is_active_slave(slave) ? "active" : "backup", 1855 slave_dev->name); 1856 1857 oldcurrent = rcu_access_pointer(bond->curr_active_slave); 1858 1859 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 1860 1861 if (!all && (!bond->params.fail_over_mac || 1862 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) { 1863 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) && 1864 bond_has_slaves(bond)) 1865 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", 1866 slave_dev->name, slave->perm_hwaddr, 1867 bond_dev->name, slave_dev->name); 1868 } 1869 1870 if (rtnl_dereference(bond->primary_slave) == slave) 1871 RCU_INIT_POINTER(bond->primary_slave, NULL); 1872 1873 if (oldcurrent == slave) 1874 bond_change_active_slave(bond, NULL); 1875 1876 if (bond_is_lb(bond)) { 1877 /* Must be called only after the slave has been 1878 * detached from the list and the curr_active_slave 1879 * has been cleared (if our_slave == old_current), 1880 * but before a new active slave is selected. 1881 */ 1882 bond_alb_deinit_slave(bond, slave); 1883 } 1884 1885 if (all) { 1886 RCU_INIT_POINTER(bond->curr_active_slave, NULL); 1887 } else if (oldcurrent == slave) { 1888 /* Note that we hold RTNL over this sequence, so there 1889 * is no concern that another slave add/remove event 1890 * will interfere. 1891 */ 1892 bond_select_active_slave(bond); 1893 } 1894 1895 if (!bond_has_slaves(bond)) { 1896 bond_set_carrier(bond); 1897 eth_hw_addr_random(bond_dev); 1898 } 1899 1900 unblock_netpoll_tx(); 1901 synchronize_rcu(); 1902 bond->slave_cnt--; 1903 1904 if (!bond_has_slaves(bond)) { 1905 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 1906 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev); 1907 } 1908 1909 bond_compute_features(bond); 1910 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 1911 (old_features & NETIF_F_VLAN_CHALLENGED)) 1912 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n", 1913 slave_dev->name, bond_dev->name); 1914 1915 vlan_vids_del_by_dev(slave_dev, bond_dev); 1916 1917 /* If the mode uses primary, then this case was handled above by 1918 * bond_change_active_slave(..., NULL) 1919 */ 1920 if (!bond_uses_primary(bond)) { 1921 /* unset promiscuity level from slave 1922 * NOTE: The NETDEV_CHANGEADDR call above may change the value 1923 * of the IFF_PROMISC flag in the bond_dev, but we need the 1924 * value of that flag before that change, as that was the value 1925 * when this slave was attached, so we cache at the start of the 1926 * function and use it here. Same goes for ALLMULTI below 1927 */ 1928 if (old_flags & IFF_PROMISC) 1929 dev_set_promiscuity(slave_dev, -1); 1930 1931 /* unset allmulti level from slave */ 1932 if (old_flags & IFF_ALLMULTI) 1933 dev_set_allmulti(slave_dev, -1); 1934 1935 bond_hw_addr_flush(bond_dev, slave_dev); 1936 } 1937 1938 slave_disable_netpoll(slave); 1939 1940 /* close slave before restoring its mac address */ 1941 dev_close(slave_dev); 1942 1943 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE || 1944 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1945 /* restore original ("permanent") mac address */ 1946 ether_addr_copy(addr.sa_data, slave->perm_hwaddr); 1947 addr.sa_family = slave_dev->type; 1948 dev_set_mac_address(slave_dev, &addr); 1949 } 1950 1951 dev_set_mtu(slave_dev, slave->original_mtu); 1952 1953 slave_dev->priv_flags &= ~IFF_BONDING; 1954 1955 bond_free_slave(slave); 1956 1957 return 0; 1958 } 1959 1960 /* A wrapper used because of ndo_del_link */ 1961 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 1962 { 1963 return __bond_release_one(bond_dev, slave_dev, false); 1964 } 1965 1966 /* First release a slave and then destroy the bond if no more slaves are left. 1967 * Must be under rtnl_lock when this function is called. 1968 */ 1969 static int bond_release_and_destroy(struct net_device *bond_dev, 1970 struct net_device *slave_dev) 1971 { 1972 struct bonding *bond = netdev_priv(bond_dev); 1973 int ret; 1974 1975 ret = bond_release(bond_dev, slave_dev); 1976 if (ret == 0 && !bond_has_slaves(bond)) { 1977 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 1978 netdev_info(bond_dev, "Destroying bond %s\n", 1979 bond_dev->name); 1980 bond_remove_proc_entry(bond); 1981 unregister_netdevice(bond_dev); 1982 } 1983 return ret; 1984 } 1985 1986 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info) 1987 { 1988 struct bonding *bond = netdev_priv(bond_dev); 1989 bond_fill_ifbond(bond, info); 1990 return 0; 1991 } 1992 1993 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 1994 { 1995 struct bonding *bond = netdev_priv(bond_dev); 1996 struct list_head *iter; 1997 int i = 0, res = -ENODEV; 1998 struct slave *slave; 1999 2000 bond_for_each_slave(bond, slave, iter) { 2001 if (i++ == (int)info->slave_id) { 2002 res = 0; 2003 bond_fill_ifslave(slave, info); 2004 break; 2005 } 2006 } 2007 2008 return res; 2009 } 2010 2011 /*-------------------------------- Monitoring -------------------------------*/ 2012 2013 /* called with rcu_read_lock() */ 2014 static int bond_miimon_inspect(struct bonding *bond) 2015 { 2016 int link_state, commit = 0; 2017 struct list_head *iter; 2018 struct slave *slave; 2019 bool ignore_updelay; 2020 2021 ignore_updelay = !rcu_dereference(bond->curr_active_slave); 2022 2023 bond_for_each_slave_rcu(bond, slave, iter) { 2024 slave->new_link = BOND_LINK_NOCHANGE; 2025 2026 link_state = bond_check_dev_link(bond, slave->dev, 0); 2027 2028 switch (slave->link) { 2029 case BOND_LINK_UP: 2030 if (link_state) 2031 continue; 2032 2033 bond_set_slave_link_state(slave, BOND_LINK_FAIL, 2034 BOND_SLAVE_NOTIFY_LATER); 2035 slave->delay = bond->params.downdelay; 2036 if (slave->delay) { 2037 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n", 2038 (BOND_MODE(bond) == 2039 BOND_MODE_ACTIVEBACKUP) ? 2040 (bond_is_active_slave(slave) ? 2041 "active " : "backup ") : "", 2042 slave->dev->name, 2043 bond->params.downdelay * bond->params.miimon); 2044 } 2045 /*FALLTHRU*/ 2046 case BOND_LINK_FAIL: 2047 if (link_state) { 2048 /* recovered before downdelay expired */ 2049 bond_set_slave_link_state(slave, BOND_LINK_UP, 2050 BOND_SLAVE_NOTIFY_LATER); 2051 slave->last_link_up = jiffies; 2052 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n", 2053 (bond->params.downdelay - slave->delay) * 2054 bond->params.miimon, 2055 slave->dev->name); 2056 continue; 2057 } 2058 2059 if (slave->delay <= 0) { 2060 slave->new_link = BOND_LINK_DOWN; 2061 commit++; 2062 continue; 2063 } 2064 2065 slave->delay--; 2066 break; 2067 2068 case BOND_LINK_DOWN: 2069 if (!link_state) 2070 continue; 2071 2072 bond_set_slave_link_state(slave, BOND_LINK_BACK, 2073 BOND_SLAVE_NOTIFY_LATER); 2074 slave->delay = bond->params.updelay; 2075 2076 if (slave->delay) { 2077 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n", 2078 slave->dev->name, 2079 ignore_updelay ? 0 : 2080 bond->params.updelay * 2081 bond->params.miimon); 2082 } 2083 /*FALLTHRU*/ 2084 case BOND_LINK_BACK: 2085 if (!link_state) { 2086 bond_set_slave_link_state(slave, 2087 BOND_LINK_DOWN, 2088 BOND_SLAVE_NOTIFY_LATER); 2089 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n", 2090 (bond->params.updelay - slave->delay) * 2091 bond->params.miimon, 2092 slave->dev->name); 2093 2094 continue; 2095 } 2096 2097 if (ignore_updelay) 2098 slave->delay = 0; 2099 2100 if (slave->delay <= 0) { 2101 slave->new_link = BOND_LINK_UP; 2102 commit++; 2103 ignore_updelay = false; 2104 continue; 2105 } 2106 2107 slave->delay--; 2108 break; 2109 } 2110 } 2111 2112 return commit; 2113 } 2114 2115 static void bond_miimon_commit(struct bonding *bond) 2116 { 2117 struct list_head *iter; 2118 struct slave *slave, *primary; 2119 2120 bond_for_each_slave(bond, slave, iter) { 2121 switch (slave->new_link) { 2122 case BOND_LINK_NOCHANGE: 2123 continue; 2124 2125 case BOND_LINK_UP: 2126 bond_update_speed_duplex(slave); 2127 bond_set_slave_link_state(slave, BOND_LINK_UP, 2128 BOND_SLAVE_NOTIFY_NOW); 2129 slave->last_link_up = jiffies; 2130 2131 primary = rtnl_dereference(bond->primary_slave); 2132 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 2133 /* prevent it from being the active one */ 2134 bond_set_backup_slave(slave); 2135 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2136 /* make it immediately active */ 2137 bond_set_active_slave(slave); 2138 } else if (slave != primary) { 2139 /* prevent it from being the active one */ 2140 bond_set_backup_slave(slave); 2141 } 2142 2143 netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n", 2144 slave->dev->name, 2145 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed, 2146 slave->duplex ? "full" : "half"); 2147 2148 /* notify ad that the link status has changed */ 2149 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2150 bond_3ad_handle_link_change(slave, BOND_LINK_UP); 2151 2152 if (bond_is_lb(bond)) 2153 bond_alb_handle_link_change(bond, slave, 2154 BOND_LINK_UP); 2155 2156 if (BOND_MODE(bond) == BOND_MODE_XOR) 2157 bond_update_slave_arr(bond, NULL); 2158 2159 if (!bond->curr_active_slave || slave == primary) 2160 goto do_failover; 2161 2162 continue; 2163 2164 case BOND_LINK_DOWN: 2165 if (slave->link_failure_count < UINT_MAX) 2166 slave->link_failure_count++; 2167 2168 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2169 BOND_SLAVE_NOTIFY_NOW); 2170 2171 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP || 2172 BOND_MODE(bond) == BOND_MODE_8023AD) 2173 bond_set_slave_inactive_flags(slave, 2174 BOND_SLAVE_NOTIFY_NOW); 2175 2176 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n", 2177 slave->dev->name); 2178 2179 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2180 bond_3ad_handle_link_change(slave, 2181 BOND_LINK_DOWN); 2182 2183 if (bond_is_lb(bond)) 2184 bond_alb_handle_link_change(bond, slave, 2185 BOND_LINK_DOWN); 2186 2187 if (BOND_MODE(bond) == BOND_MODE_XOR) 2188 bond_update_slave_arr(bond, NULL); 2189 2190 if (slave == rcu_access_pointer(bond->curr_active_slave)) 2191 goto do_failover; 2192 2193 continue; 2194 2195 default: 2196 netdev_err(bond->dev, "invalid new link %d on slave %s\n", 2197 slave->new_link, slave->dev->name); 2198 slave->new_link = BOND_LINK_NOCHANGE; 2199 2200 continue; 2201 } 2202 2203 do_failover: 2204 block_netpoll_tx(); 2205 bond_select_active_slave(bond); 2206 unblock_netpoll_tx(); 2207 } 2208 2209 bond_set_carrier(bond); 2210 } 2211 2212 /* bond_mii_monitor 2213 * 2214 * Really a wrapper that splits the mii monitor into two phases: an 2215 * inspection, then (if inspection indicates something needs to be done) 2216 * an acquisition of appropriate locks followed by a commit phase to 2217 * implement whatever link state changes are indicated. 2218 */ 2219 static void bond_mii_monitor(struct work_struct *work) 2220 { 2221 struct bonding *bond = container_of(work, struct bonding, 2222 mii_work.work); 2223 bool should_notify_peers = false; 2224 unsigned long delay; 2225 2226 delay = msecs_to_jiffies(bond->params.miimon); 2227 2228 if (!bond_has_slaves(bond)) 2229 goto re_arm; 2230 2231 rcu_read_lock(); 2232 2233 should_notify_peers = bond_should_notify_peers(bond); 2234 2235 if (bond_miimon_inspect(bond)) { 2236 rcu_read_unlock(); 2237 2238 /* Race avoidance with bond_close cancel of workqueue */ 2239 if (!rtnl_trylock()) { 2240 delay = 1; 2241 should_notify_peers = false; 2242 goto re_arm; 2243 } 2244 2245 bond_miimon_commit(bond); 2246 2247 rtnl_unlock(); /* might sleep, hold no other locks */ 2248 } else 2249 rcu_read_unlock(); 2250 2251 re_arm: 2252 if (bond->params.miimon) 2253 queue_delayed_work(bond->wq, &bond->mii_work, delay); 2254 2255 if (should_notify_peers) { 2256 if (!rtnl_trylock()) 2257 return; 2258 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); 2259 rtnl_unlock(); 2260 } 2261 } 2262 2263 static bool bond_has_this_ip(struct bonding *bond, __be32 ip) 2264 { 2265 struct net_device *upper; 2266 struct list_head *iter; 2267 bool ret = false; 2268 2269 if (ip == bond_confirm_addr(bond->dev, 0, ip)) 2270 return true; 2271 2272 rcu_read_lock(); 2273 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) { 2274 if (ip == bond_confirm_addr(upper, 0, ip)) { 2275 ret = true; 2276 break; 2277 } 2278 } 2279 rcu_read_unlock(); 2280 2281 return ret; 2282 } 2283 2284 /* We go to the (large) trouble of VLAN tagging ARP frames because 2285 * switches in VLAN mode (especially if ports are configured as 2286 * "native" to a VLAN) might not pass non-tagged frames. 2287 */ 2288 static void bond_arp_send(struct net_device *slave_dev, int arp_op, 2289 __be32 dest_ip, __be32 src_ip, 2290 struct bond_vlan_tag *tags) 2291 { 2292 struct sk_buff *skb; 2293 struct bond_vlan_tag *outer_tag = tags; 2294 2295 netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n", 2296 arp_op, slave_dev->name, &dest_ip, &src_ip); 2297 2298 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2299 NULL, slave_dev->dev_addr, NULL); 2300 2301 if (!skb) { 2302 net_err_ratelimited("ARP packet allocation failed\n"); 2303 return; 2304 } 2305 2306 if (!tags || tags->vlan_proto == VLAN_N_VID) 2307 goto xmit; 2308 2309 tags++; 2310 2311 /* Go through all the tags backwards and add them to the packet */ 2312 while (tags->vlan_proto != VLAN_N_VID) { 2313 if (!tags->vlan_id) { 2314 tags++; 2315 continue; 2316 } 2317 2318 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n", 2319 ntohs(outer_tag->vlan_proto), tags->vlan_id); 2320 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto, 2321 tags->vlan_id); 2322 if (!skb) { 2323 net_err_ratelimited("failed to insert inner VLAN tag\n"); 2324 return; 2325 } 2326 2327 tags++; 2328 } 2329 /* Set the outer tag */ 2330 if (outer_tag->vlan_id) { 2331 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n", 2332 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id); 2333 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto, 2334 outer_tag->vlan_id); 2335 } 2336 2337 xmit: 2338 arp_xmit(skb); 2339 } 2340 2341 /* Validate the device path between the @start_dev and the @end_dev. 2342 * The path is valid if the @end_dev is reachable through device 2343 * stacking. 2344 * When the path is validated, collect any vlan information in the 2345 * path. 2346 */ 2347 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev, 2348 struct net_device *end_dev, 2349 int level) 2350 { 2351 struct bond_vlan_tag *tags; 2352 struct net_device *upper; 2353 struct list_head *iter; 2354 2355 if (start_dev == end_dev) { 2356 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC); 2357 if (!tags) 2358 return ERR_PTR(-ENOMEM); 2359 tags[level].vlan_proto = VLAN_N_VID; 2360 return tags; 2361 } 2362 2363 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) { 2364 tags = bond_verify_device_path(upper, end_dev, level + 1); 2365 if (IS_ERR_OR_NULL(tags)) { 2366 if (IS_ERR(tags)) 2367 return tags; 2368 continue; 2369 } 2370 if (is_vlan_dev(upper)) { 2371 tags[level].vlan_proto = vlan_dev_vlan_proto(upper); 2372 tags[level].vlan_id = vlan_dev_vlan_id(upper); 2373 } 2374 2375 return tags; 2376 } 2377 2378 return NULL; 2379 } 2380 2381 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2382 { 2383 struct rtable *rt; 2384 struct bond_vlan_tag *tags; 2385 __be32 *targets = bond->params.arp_targets, addr; 2386 int i; 2387 2388 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) { 2389 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]); 2390 tags = NULL; 2391 2392 /* Find out through which dev should the packet go */ 2393 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 2394 RTO_ONLINK, 0); 2395 if (IS_ERR(rt)) { 2396 /* there's no route to target - try to send arp 2397 * probe to generate any traffic (arp_validate=0) 2398 */ 2399 if (bond->params.arp_validate) 2400 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n", 2401 bond->dev->name, 2402 &targets[i]); 2403 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2404 0, tags); 2405 continue; 2406 } 2407 2408 /* bond device itself */ 2409 if (rt->dst.dev == bond->dev) 2410 goto found; 2411 2412 rcu_read_lock(); 2413 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0); 2414 rcu_read_unlock(); 2415 2416 if (!IS_ERR_OR_NULL(tags)) 2417 goto found; 2418 2419 /* Not our device - skip */ 2420 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n", 2421 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL"); 2422 2423 ip_rt_put(rt); 2424 continue; 2425 2426 found: 2427 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0); 2428 ip_rt_put(rt); 2429 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2430 addr, tags); 2431 kfree(tags); 2432 } 2433 } 2434 2435 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 2436 { 2437 int i; 2438 2439 if (!sip || !bond_has_this_ip(bond, tip)) { 2440 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n", 2441 &sip, &tip); 2442 return; 2443 } 2444 2445 i = bond_get_targets_ip(bond->params.arp_targets, sip); 2446 if (i == -1) { 2447 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n", 2448 &sip); 2449 return; 2450 } 2451 slave->last_rx = jiffies; 2452 slave->target_last_arp_rx[i] = jiffies; 2453 } 2454 2455 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, 2456 struct slave *slave) 2457 { 2458 struct arphdr *arp = (struct arphdr *)skb->data; 2459 struct slave *curr_active_slave, *curr_arp_slave; 2460 unsigned char *arp_ptr; 2461 __be32 sip, tip; 2462 int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP); 2463 2464 if (!slave_do_arp_validate(bond, slave)) { 2465 if ((slave_do_arp_validate_only(bond) && is_arp) || 2466 !slave_do_arp_validate_only(bond)) 2467 slave->last_rx = jiffies; 2468 return RX_HANDLER_ANOTHER; 2469 } else if (!is_arp) { 2470 return RX_HANDLER_ANOTHER; 2471 } 2472 2473 alen = arp_hdr_len(bond->dev); 2474 2475 netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n", 2476 skb->dev->name); 2477 2478 if (alen > skb_headlen(skb)) { 2479 arp = kmalloc(alen, GFP_ATOMIC); 2480 if (!arp) 2481 goto out_unlock; 2482 if (skb_copy_bits(skb, 0, arp, alen) < 0) 2483 goto out_unlock; 2484 } 2485 2486 if (arp->ar_hln != bond->dev->addr_len || 2487 skb->pkt_type == PACKET_OTHERHOST || 2488 skb->pkt_type == PACKET_LOOPBACK || 2489 arp->ar_hrd != htons(ARPHRD_ETHER) || 2490 arp->ar_pro != htons(ETH_P_IP) || 2491 arp->ar_pln != 4) 2492 goto out_unlock; 2493 2494 arp_ptr = (unsigned char *)(arp + 1); 2495 arp_ptr += bond->dev->addr_len; 2496 memcpy(&sip, arp_ptr, 4); 2497 arp_ptr += 4 + bond->dev->addr_len; 2498 memcpy(&tip, arp_ptr, 4); 2499 2500 netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n", 2501 slave->dev->name, bond_slave_state(slave), 2502 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 2503 &sip, &tip); 2504 2505 curr_active_slave = rcu_dereference(bond->curr_active_slave); 2506 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 2507 2508 /* We 'trust' the received ARP enough to validate it if: 2509 * 2510 * (a) the slave receiving the ARP is active (which includes the 2511 * current ARP slave, if any), or 2512 * 2513 * (b) the receiving slave isn't active, but there is a currently 2514 * active slave and it received valid arp reply(s) after it became 2515 * the currently active slave, or 2516 * 2517 * (c) there is an ARP slave that sent an ARP during the prior ARP 2518 * interval, and we receive an ARP reply on any slave. We accept 2519 * these because switch FDB update delays may deliver the ARP 2520 * reply to a slave other than the sender of the ARP request. 2521 * 2522 * Note: for (b), backup slaves are receiving the broadcast ARP 2523 * request, not a reply. This request passes from the sending 2524 * slave through the L2 switch(es) to the receiving slave. Since 2525 * this is checking the request, sip/tip are swapped for 2526 * validation. 2527 * 2528 * This is done to avoid endless looping when we can't reach the 2529 * arp_ip_target and fool ourselves with our own arp requests. 2530 */ 2531 if (bond_is_active_slave(slave)) 2532 bond_validate_arp(bond, slave, sip, tip); 2533 else if (curr_active_slave && 2534 time_after(slave_last_rx(bond, curr_active_slave), 2535 curr_active_slave->last_link_up)) 2536 bond_validate_arp(bond, slave, tip, sip); 2537 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) && 2538 bond_time_in_interval(bond, 2539 dev_trans_start(curr_arp_slave->dev), 1)) 2540 bond_validate_arp(bond, slave, sip, tip); 2541 2542 out_unlock: 2543 if (arp != (struct arphdr *)skb->data) 2544 kfree(arp); 2545 return RX_HANDLER_ANOTHER; 2546 } 2547 2548 /* function to verify if we're in the arp_interval timeslice, returns true if 2549 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval + 2550 * arp_interval/2) . the arp_interval/2 is needed for really fast networks. 2551 */ 2552 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 2553 int mod) 2554 { 2555 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2556 2557 return time_in_range(jiffies, 2558 last_act - delta_in_ticks, 2559 last_act + mod * delta_in_ticks + delta_in_ticks/2); 2560 } 2561 2562 /* This function is called regularly to monitor each slave's link 2563 * ensuring that traffic is being sent and received when arp monitoring 2564 * is used in load-balancing mode. if the adapter has been dormant, then an 2565 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 2566 * arp monitoring in active backup mode. 2567 */ 2568 static void bond_loadbalance_arp_mon(struct work_struct *work) 2569 { 2570 struct bonding *bond = container_of(work, struct bonding, 2571 arp_work.work); 2572 struct slave *slave, *oldcurrent; 2573 struct list_head *iter; 2574 int do_failover = 0, slave_state_changed = 0; 2575 2576 if (!bond_has_slaves(bond)) 2577 goto re_arm; 2578 2579 rcu_read_lock(); 2580 2581 oldcurrent = rcu_dereference(bond->curr_active_slave); 2582 /* see if any of the previous devices are up now (i.e. they have 2583 * xmt and rcv traffic). the curr_active_slave does not come into 2584 * the picture unless it is null. also, slave->last_link_up is not 2585 * needed here because we send an arp on each slave and give a slave 2586 * as long as it needs to get the tx/rx within the delta. 2587 * TODO: what about up/down delay in arp mode? it wasn't here before 2588 * so it can wait 2589 */ 2590 bond_for_each_slave_rcu(bond, slave, iter) { 2591 unsigned long trans_start = dev_trans_start(slave->dev); 2592 2593 if (slave->link != BOND_LINK_UP) { 2594 if (bond_time_in_interval(bond, trans_start, 1) && 2595 bond_time_in_interval(bond, slave->last_rx, 1)) { 2596 2597 slave->link = BOND_LINK_UP; 2598 slave_state_changed = 1; 2599 2600 /* primary_slave has no meaning in round-robin 2601 * mode. the window of a slave being up and 2602 * curr_active_slave being null after enslaving 2603 * is closed. 2604 */ 2605 if (!oldcurrent) { 2606 netdev_info(bond->dev, "link status definitely up for interface %s\n", 2607 slave->dev->name); 2608 do_failover = 1; 2609 } else { 2610 netdev_info(bond->dev, "interface %s is now up\n", 2611 slave->dev->name); 2612 } 2613 } 2614 } else { 2615 /* slave->link == BOND_LINK_UP */ 2616 2617 /* not all switches will respond to an arp request 2618 * when the source ip is 0, so don't take the link down 2619 * if we don't know our ip yet 2620 */ 2621 if (!bond_time_in_interval(bond, trans_start, 2) || 2622 !bond_time_in_interval(bond, slave->last_rx, 2)) { 2623 2624 slave->link = BOND_LINK_DOWN; 2625 slave_state_changed = 1; 2626 2627 if (slave->link_failure_count < UINT_MAX) 2628 slave->link_failure_count++; 2629 2630 netdev_info(bond->dev, "interface %s is now down\n", 2631 slave->dev->name); 2632 2633 if (slave == oldcurrent) 2634 do_failover = 1; 2635 } 2636 } 2637 2638 /* note: if switch is in round-robin mode, all links 2639 * must tx arp to ensure all links rx an arp - otherwise 2640 * links may oscillate or not come up at all; if switch is 2641 * in something like xor mode, there is nothing we can 2642 * do - all replies will be rx'ed on same link causing slaves 2643 * to be unstable during low/no traffic periods 2644 */ 2645 if (bond_slave_is_up(slave)) 2646 bond_arp_send_all(bond, slave); 2647 } 2648 2649 rcu_read_unlock(); 2650 2651 if (do_failover || slave_state_changed) { 2652 if (!rtnl_trylock()) 2653 goto re_arm; 2654 2655 if (slave_state_changed) { 2656 bond_slave_state_change(bond); 2657 if (BOND_MODE(bond) == BOND_MODE_XOR) 2658 bond_update_slave_arr(bond, NULL); 2659 } 2660 if (do_failover) { 2661 block_netpoll_tx(); 2662 bond_select_active_slave(bond); 2663 unblock_netpoll_tx(); 2664 } 2665 rtnl_unlock(); 2666 } 2667 2668 re_arm: 2669 if (bond->params.arp_interval) 2670 queue_delayed_work(bond->wq, &bond->arp_work, 2671 msecs_to_jiffies(bond->params.arp_interval)); 2672 } 2673 2674 /* Called to inspect slaves for active-backup mode ARP monitor link state 2675 * changes. Sets new_link in slaves to specify what action should take 2676 * place for the slave. Returns 0 if no changes are found, >0 if changes 2677 * to link states must be committed. 2678 * 2679 * Called with rcu_read_lock held. 2680 */ 2681 static int bond_ab_arp_inspect(struct bonding *bond) 2682 { 2683 unsigned long trans_start, last_rx; 2684 struct list_head *iter; 2685 struct slave *slave; 2686 int commit = 0; 2687 2688 bond_for_each_slave_rcu(bond, slave, iter) { 2689 slave->new_link = BOND_LINK_NOCHANGE; 2690 last_rx = slave_last_rx(bond, slave); 2691 2692 if (slave->link != BOND_LINK_UP) { 2693 if (bond_time_in_interval(bond, last_rx, 1)) { 2694 slave->new_link = BOND_LINK_UP; 2695 commit++; 2696 } 2697 continue; 2698 } 2699 2700 /* Give slaves 2*delta after being enslaved or made 2701 * active. This avoids bouncing, as the last receive 2702 * times need a full ARP monitor cycle to be updated. 2703 */ 2704 if (bond_time_in_interval(bond, slave->last_link_up, 2)) 2705 continue; 2706 2707 /* Backup slave is down if: 2708 * - No current_arp_slave AND 2709 * - more than 3*delta since last receive AND 2710 * - the bond has an IP address 2711 * 2712 * Note: a non-null current_arp_slave indicates 2713 * the curr_active_slave went down and we are 2714 * searching for a new one; under this condition 2715 * we only take the curr_active_slave down - this 2716 * gives each slave a chance to tx/rx traffic 2717 * before being taken out 2718 */ 2719 if (!bond_is_active_slave(slave) && 2720 !rcu_access_pointer(bond->current_arp_slave) && 2721 !bond_time_in_interval(bond, last_rx, 3)) { 2722 slave->new_link = BOND_LINK_DOWN; 2723 commit++; 2724 } 2725 2726 /* Active slave is down if: 2727 * - more than 2*delta since transmitting OR 2728 * - (more than 2*delta since receive AND 2729 * the bond has an IP address) 2730 */ 2731 trans_start = dev_trans_start(slave->dev); 2732 if (bond_is_active_slave(slave) && 2733 (!bond_time_in_interval(bond, trans_start, 2) || 2734 !bond_time_in_interval(bond, last_rx, 2))) { 2735 slave->new_link = BOND_LINK_DOWN; 2736 commit++; 2737 } 2738 } 2739 2740 return commit; 2741 } 2742 2743 /* Called to commit link state changes noted by inspection step of 2744 * active-backup mode ARP monitor. 2745 * 2746 * Called with RTNL hold. 2747 */ 2748 static void bond_ab_arp_commit(struct bonding *bond) 2749 { 2750 unsigned long trans_start; 2751 struct list_head *iter; 2752 struct slave *slave; 2753 2754 bond_for_each_slave(bond, slave, iter) { 2755 switch (slave->new_link) { 2756 case BOND_LINK_NOCHANGE: 2757 continue; 2758 2759 case BOND_LINK_UP: 2760 trans_start = dev_trans_start(slave->dev); 2761 if (rtnl_dereference(bond->curr_active_slave) != slave || 2762 (!rtnl_dereference(bond->curr_active_slave) && 2763 bond_time_in_interval(bond, trans_start, 1))) { 2764 struct slave *current_arp_slave; 2765 2766 current_arp_slave = rtnl_dereference(bond->current_arp_slave); 2767 bond_set_slave_link_state(slave, BOND_LINK_UP, 2768 BOND_SLAVE_NOTIFY_NOW); 2769 if (current_arp_slave) { 2770 bond_set_slave_inactive_flags( 2771 current_arp_slave, 2772 BOND_SLAVE_NOTIFY_NOW); 2773 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2774 } 2775 2776 netdev_info(bond->dev, "link status definitely up for interface %s\n", 2777 slave->dev->name); 2778 2779 if (!rtnl_dereference(bond->curr_active_slave) || 2780 slave == rtnl_dereference(bond->primary_slave)) 2781 goto do_failover; 2782 2783 } 2784 2785 continue; 2786 2787 case BOND_LINK_DOWN: 2788 if (slave->link_failure_count < UINT_MAX) 2789 slave->link_failure_count++; 2790 2791 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2792 BOND_SLAVE_NOTIFY_NOW); 2793 bond_set_slave_inactive_flags(slave, 2794 BOND_SLAVE_NOTIFY_NOW); 2795 2796 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n", 2797 slave->dev->name); 2798 2799 if (slave == rtnl_dereference(bond->curr_active_slave)) { 2800 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2801 goto do_failover; 2802 } 2803 2804 continue; 2805 2806 default: 2807 netdev_err(bond->dev, "impossible: new_link %d on slave %s\n", 2808 slave->new_link, slave->dev->name); 2809 continue; 2810 } 2811 2812 do_failover: 2813 block_netpoll_tx(); 2814 bond_select_active_slave(bond); 2815 unblock_netpoll_tx(); 2816 } 2817 2818 bond_set_carrier(bond); 2819 } 2820 2821 /* Send ARP probes for active-backup mode ARP monitor. 2822 * 2823 * Called with rcu_read_lock held. 2824 */ 2825 static bool bond_ab_arp_probe(struct bonding *bond) 2826 { 2827 struct slave *slave, *before = NULL, *new_slave = NULL, 2828 *curr_arp_slave = rcu_dereference(bond->current_arp_slave), 2829 *curr_active_slave = rcu_dereference(bond->curr_active_slave); 2830 struct list_head *iter; 2831 bool found = false; 2832 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; 2833 2834 if (curr_arp_slave && curr_active_slave) 2835 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n", 2836 curr_arp_slave->dev->name, 2837 curr_active_slave->dev->name); 2838 2839 if (curr_active_slave) { 2840 bond_arp_send_all(bond, curr_active_slave); 2841 return should_notify_rtnl; 2842 } 2843 2844 /* if we don't have a curr_active_slave, search for the next available 2845 * backup slave from the current_arp_slave and make it the candidate 2846 * for becoming the curr_active_slave 2847 */ 2848 2849 if (!curr_arp_slave) { 2850 curr_arp_slave = bond_first_slave_rcu(bond); 2851 if (!curr_arp_slave) 2852 return should_notify_rtnl; 2853 } 2854 2855 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER); 2856 2857 bond_for_each_slave_rcu(bond, slave, iter) { 2858 if (!found && !before && bond_slave_is_up(slave)) 2859 before = slave; 2860 2861 if (found && !new_slave && bond_slave_is_up(slave)) 2862 new_slave = slave; 2863 /* if the link state is up at this point, we 2864 * mark it down - this can happen if we have 2865 * simultaneous link failures and 2866 * reselect_active_interface doesn't make this 2867 * one the current slave so it is still marked 2868 * up when it is actually down 2869 */ 2870 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 2871 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2872 BOND_SLAVE_NOTIFY_LATER); 2873 if (slave->link_failure_count < UINT_MAX) 2874 slave->link_failure_count++; 2875 2876 bond_set_slave_inactive_flags(slave, 2877 BOND_SLAVE_NOTIFY_LATER); 2878 2879 netdev_info(bond->dev, "backup interface %s is now down\n", 2880 slave->dev->name); 2881 } 2882 if (slave == curr_arp_slave) 2883 found = true; 2884 } 2885 2886 if (!new_slave && before) 2887 new_slave = before; 2888 2889 if (!new_slave) 2890 goto check_state; 2891 2892 bond_set_slave_link_state(new_slave, BOND_LINK_BACK, 2893 BOND_SLAVE_NOTIFY_LATER); 2894 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER); 2895 bond_arp_send_all(bond, new_slave); 2896 new_slave->last_link_up = jiffies; 2897 rcu_assign_pointer(bond->current_arp_slave, new_slave); 2898 2899 check_state: 2900 bond_for_each_slave_rcu(bond, slave, iter) { 2901 if (slave->should_notify || slave->should_notify_link) { 2902 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; 2903 break; 2904 } 2905 } 2906 return should_notify_rtnl; 2907 } 2908 2909 static void bond_activebackup_arp_mon(struct work_struct *work) 2910 { 2911 struct bonding *bond = container_of(work, struct bonding, 2912 arp_work.work); 2913 bool should_notify_peers = false; 2914 bool should_notify_rtnl = false; 2915 int delta_in_ticks; 2916 2917 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2918 2919 if (!bond_has_slaves(bond)) 2920 goto re_arm; 2921 2922 rcu_read_lock(); 2923 2924 should_notify_peers = bond_should_notify_peers(bond); 2925 2926 if (bond_ab_arp_inspect(bond)) { 2927 rcu_read_unlock(); 2928 2929 /* Race avoidance with bond_close flush of workqueue */ 2930 if (!rtnl_trylock()) { 2931 delta_in_ticks = 1; 2932 should_notify_peers = false; 2933 goto re_arm; 2934 } 2935 2936 bond_ab_arp_commit(bond); 2937 2938 rtnl_unlock(); 2939 rcu_read_lock(); 2940 } 2941 2942 should_notify_rtnl = bond_ab_arp_probe(bond); 2943 rcu_read_unlock(); 2944 2945 re_arm: 2946 if (bond->params.arp_interval) 2947 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 2948 2949 if (should_notify_peers || should_notify_rtnl) { 2950 if (!rtnl_trylock()) 2951 return; 2952 2953 if (should_notify_peers) 2954 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 2955 bond->dev); 2956 if (should_notify_rtnl) { 2957 bond_slave_state_notify(bond); 2958 bond_slave_link_notify(bond); 2959 } 2960 2961 rtnl_unlock(); 2962 } 2963 } 2964 2965 /*-------------------------- netdev event handling --------------------------*/ 2966 2967 /* Change device name */ 2968 static int bond_event_changename(struct bonding *bond) 2969 { 2970 bond_remove_proc_entry(bond); 2971 bond_create_proc_entry(bond); 2972 2973 bond_debug_reregister(bond); 2974 2975 return NOTIFY_DONE; 2976 } 2977 2978 static int bond_master_netdev_event(unsigned long event, 2979 struct net_device *bond_dev) 2980 { 2981 struct bonding *event_bond = netdev_priv(bond_dev); 2982 2983 switch (event) { 2984 case NETDEV_CHANGENAME: 2985 return bond_event_changename(event_bond); 2986 case NETDEV_UNREGISTER: 2987 bond_remove_proc_entry(event_bond); 2988 break; 2989 case NETDEV_REGISTER: 2990 bond_create_proc_entry(event_bond); 2991 break; 2992 case NETDEV_NOTIFY_PEERS: 2993 if (event_bond->send_peer_notif) 2994 event_bond->send_peer_notif--; 2995 break; 2996 default: 2997 break; 2998 } 2999 3000 return NOTIFY_DONE; 3001 } 3002 3003 static int bond_slave_netdev_event(unsigned long event, 3004 struct net_device *slave_dev) 3005 { 3006 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary; 3007 struct bonding *bond; 3008 struct net_device *bond_dev; 3009 3010 /* A netdev event can be generated while enslaving a device 3011 * before netdev_rx_handler_register is called in which case 3012 * slave will be NULL 3013 */ 3014 if (!slave) 3015 return NOTIFY_DONE; 3016 bond_dev = slave->bond->dev; 3017 bond = slave->bond; 3018 primary = rtnl_dereference(bond->primary_slave); 3019 3020 switch (event) { 3021 case NETDEV_UNREGISTER: 3022 if (bond_dev->type != ARPHRD_ETHER) 3023 bond_release_and_destroy(bond_dev, slave_dev); 3024 else 3025 bond_release(bond_dev, slave_dev); 3026 break; 3027 case NETDEV_UP: 3028 case NETDEV_CHANGE: 3029 bond_update_speed_duplex(slave); 3030 if (BOND_MODE(bond) == BOND_MODE_8023AD) 3031 bond_3ad_adapter_speed_duplex_changed(slave); 3032 /* Fallthrough */ 3033 case NETDEV_DOWN: 3034 /* Refresh slave-array if applicable! 3035 * If the setup does not use miimon or arpmon (mode-specific!), 3036 * then these events will not cause the slave-array to be 3037 * refreshed. This will cause xmit to use a slave that is not 3038 * usable. Avoid such situation by refeshing the array at these 3039 * events. If these (miimon/arpmon) parameters are configured 3040 * then array gets refreshed twice and that should be fine! 3041 */ 3042 if (bond_mode_uses_xmit_hash(bond)) 3043 bond_update_slave_arr(bond, NULL); 3044 break; 3045 case NETDEV_CHANGEMTU: 3046 /* TODO: Should slaves be allowed to 3047 * independently alter their MTU? For 3048 * an active-backup bond, slaves need 3049 * not be the same type of device, so 3050 * MTUs may vary. For other modes, 3051 * slaves arguably should have the 3052 * same MTUs. To do this, we'd need to 3053 * take over the slave's change_mtu 3054 * function for the duration of their 3055 * servitude. 3056 */ 3057 break; 3058 case NETDEV_CHANGENAME: 3059 /* we don't care if we don't have primary set */ 3060 if (!bond_uses_primary(bond) || 3061 !bond->params.primary[0]) 3062 break; 3063 3064 if (slave == primary) { 3065 /* slave's name changed - he's no longer primary */ 3066 RCU_INIT_POINTER(bond->primary_slave, NULL); 3067 } else if (!strcmp(slave_dev->name, bond->params.primary)) { 3068 /* we have a new primary slave */ 3069 rcu_assign_pointer(bond->primary_slave, slave); 3070 } else { /* we didn't change primary - exit */ 3071 break; 3072 } 3073 3074 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n", 3075 primary ? slave_dev->name : "none"); 3076 3077 block_netpoll_tx(); 3078 bond_select_active_slave(bond); 3079 unblock_netpoll_tx(); 3080 break; 3081 case NETDEV_FEAT_CHANGE: 3082 bond_compute_features(bond); 3083 break; 3084 case NETDEV_RESEND_IGMP: 3085 /* Propagate to master device */ 3086 call_netdevice_notifiers(event, slave->bond->dev); 3087 break; 3088 default: 3089 break; 3090 } 3091 3092 return NOTIFY_DONE; 3093 } 3094 3095 /* bond_netdev_event: handle netdev notifier chain events. 3096 * 3097 * This function receives events for the netdev chain. The caller (an 3098 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 3099 * locks for us to safely manipulate the slave devices (RTNL lock, 3100 * dev_probe_lock). 3101 */ 3102 static int bond_netdev_event(struct notifier_block *this, 3103 unsigned long event, void *ptr) 3104 { 3105 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 3106 3107 netdev_dbg(event_dev, "event: %lx\n", event); 3108 3109 if (!(event_dev->priv_flags & IFF_BONDING)) 3110 return NOTIFY_DONE; 3111 3112 if (event_dev->flags & IFF_MASTER) { 3113 netdev_dbg(event_dev, "IFF_MASTER\n"); 3114 return bond_master_netdev_event(event, event_dev); 3115 } 3116 3117 if (event_dev->flags & IFF_SLAVE) { 3118 netdev_dbg(event_dev, "IFF_SLAVE\n"); 3119 return bond_slave_netdev_event(event, event_dev); 3120 } 3121 3122 return NOTIFY_DONE; 3123 } 3124 3125 static struct notifier_block bond_netdev_notifier = { 3126 .notifier_call = bond_netdev_event, 3127 }; 3128 3129 /*---------------------------- Hashing Policies -----------------------------*/ 3130 3131 /* L2 hash helper */ 3132 static inline u32 bond_eth_hash(struct sk_buff *skb) 3133 { 3134 struct ethhdr *ep, hdr_tmp; 3135 3136 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp); 3137 if (ep) 3138 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto; 3139 return 0; 3140 } 3141 3142 /* Extract the appropriate headers based on bond's xmit policy */ 3143 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, 3144 struct flow_keys *fk) 3145 { 3146 const struct ipv6hdr *iph6; 3147 const struct iphdr *iph; 3148 int noff, proto = -1; 3149 3150 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23) 3151 return skb_flow_dissect_flow_keys(skb, fk, 0); 3152 3153 fk->ports.ports = 0; 3154 noff = skb_network_offset(skb); 3155 if (skb->protocol == htons(ETH_P_IP)) { 3156 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph)))) 3157 return false; 3158 iph = ip_hdr(skb); 3159 iph_to_flow_copy_v4addrs(fk, iph); 3160 noff += iph->ihl << 2; 3161 if (!ip_is_fragment(iph)) 3162 proto = iph->protocol; 3163 } else if (skb->protocol == htons(ETH_P_IPV6)) { 3164 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6)))) 3165 return false; 3166 iph6 = ipv6_hdr(skb); 3167 iph_to_flow_copy_v6addrs(fk, iph6); 3168 noff += sizeof(*iph6); 3169 proto = iph6->nexthdr; 3170 } else { 3171 return false; 3172 } 3173 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0) 3174 fk->ports.ports = skb_flow_get_ports(skb, noff, proto); 3175 3176 return true; 3177 } 3178 3179 /** 3180 * bond_xmit_hash - generate a hash value based on the xmit policy 3181 * @bond: bonding device 3182 * @skb: buffer to use for headers 3183 * 3184 * This function will extract the necessary headers from the skb buffer and use 3185 * them to generate a hash based on the xmit_policy set in the bonding device 3186 */ 3187 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb) 3188 { 3189 struct flow_keys flow; 3190 u32 hash; 3191 3192 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 && 3193 skb->l4_hash) 3194 return skb->hash; 3195 3196 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 || 3197 !bond_flow_dissect(bond, skb, &flow)) 3198 return bond_eth_hash(skb); 3199 3200 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 || 3201 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) 3202 hash = bond_eth_hash(skb); 3203 else 3204 hash = (__force u32)flow.ports.ports; 3205 hash ^= (__force u32)flow_get_u32_dst(&flow) ^ 3206 (__force u32)flow_get_u32_src(&flow); 3207 hash ^= (hash >> 16); 3208 hash ^= (hash >> 8); 3209 3210 return hash; 3211 } 3212 3213 /*-------------------------- Device entry points ----------------------------*/ 3214 3215 static void bond_work_init_all(struct bonding *bond) 3216 { 3217 INIT_DELAYED_WORK(&bond->mcast_work, 3218 bond_resend_igmp_join_requests_delayed); 3219 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 3220 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 3221 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3222 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon); 3223 else 3224 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon); 3225 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 3226 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler); 3227 } 3228 3229 static void bond_work_cancel_all(struct bonding *bond) 3230 { 3231 cancel_delayed_work_sync(&bond->mii_work); 3232 cancel_delayed_work_sync(&bond->arp_work); 3233 cancel_delayed_work_sync(&bond->alb_work); 3234 cancel_delayed_work_sync(&bond->ad_work); 3235 cancel_delayed_work_sync(&bond->mcast_work); 3236 cancel_delayed_work_sync(&bond->slave_arr_work); 3237 } 3238 3239 static int bond_open(struct net_device *bond_dev) 3240 { 3241 struct bonding *bond = netdev_priv(bond_dev); 3242 struct list_head *iter; 3243 struct slave *slave; 3244 3245 /* reset slave->backup and slave->inactive */ 3246 if (bond_has_slaves(bond)) { 3247 bond_for_each_slave(bond, slave, iter) { 3248 if (bond_uses_primary(bond) && 3249 slave != rcu_access_pointer(bond->curr_active_slave)) { 3250 bond_set_slave_inactive_flags(slave, 3251 BOND_SLAVE_NOTIFY_NOW); 3252 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) { 3253 bond_set_slave_active_flags(slave, 3254 BOND_SLAVE_NOTIFY_NOW); 3255 } 3256 } 3257 } 3258 3259 bond_work_init_all(bond); 3260 3261 if (bond_is_lb(bond)) { 3262 /* bond_alb_initialize must be called before the timer 3263 * is started. 3264 */ 3265 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB))) 3266 return -ENOMEM; 3267 if (bond->params.tlb_dynamic_lb) 3268 queue_delayed_work(bond->wq, &bond->alb_work, 0); 3269 } 3270 3271 if (bond->params.miimon) /* link check interval, in milliseconds. */ 3272 queue_delayed_work(bond->wq, &bond->mii_work, 0); 3273 3274 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 3275 queue_delayed_work(bond->wq, &bond->arp_work, 0); 3276 bond->recv_probe = bond_arp_rcv; 3277 } 3278 3279 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3280 queue_delayed_work(bond->wq, &bond->ad_work, 0); 3281 /* register to receive LACPDUs */ 3282 bond->recv_probe = bond_3ad_lacpdu_recv; 3283 bond_3ad_initiate_agg_selection(bond, 1); 3284 } 3285 3286 if (bond_mode_uses_xmit_hash(bond)) 3287 bond_update_slave_arr(bond, NULL); 3288 3289 return 0; 3290 } 3291 3292 static int bond_close(struct net_device *bond_dev) 3293 { 3294 struct bonding *bond = netdev_priv(bond_dev); 3295 3296 bond_work_cancel_all(bond); 3297 bond->send_peer_notif = 0; 3298 if (bond_is_lb(bond)) 3299 bond_alb_deinitialize(bond); 3300 bond->recv_probe = NULL; 3301 3302 return 0; 3303 } 3304 3305 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but 3306 * that some drivers can provide 32bit values only. 3307 */ 3308 static void bond_fold_stats(struct rtnl_link_stats64 *_res, 3309 const struct rtnl_link_stats64 *_new, 3310 const struct rtnl_link_stats64 *_old) 3311 { 3312 const u64 *new = (const u64 *)_new; 3313 const u64 *old = (const u64 *)_old; 3314 u64 *res = (u64 *)_res; 3315 int i; 3316 3317 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) { 3318 u64 nv = new[i]; 3319 u64 ov = old[i]; 3320 3321 /* detects if this particular field is 32bit only */ 3322 if (((nv | ov) >> 32) == 0) 3323 res[i] += (u32)nv - (u32)ov; 3324 else 3325 res[i] += nv - ov; 3326 } 3327 } 3328 3329 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev, 3330 struct rtnl_link_stats64 *stats) 3331 { 3332 struct bonding *bond = netdev_priv(bond_dev); 3333 struct rtnl_link_stats64 temp; 3334 struct list_head *iter; 3335 struct slave *slave; 3336 3337 spin_lock(&bond->stats_lock); 3338 memcpy(stats, &bond->bond_stats, sizeof(*stats)); 3339 3340 rcu_read_lock(); 3341 bond_for_each_slave_rcu(bond, slave, iter) { 3342 const struct rtnl_link_stats64 *new = 3343 dev_get_stats(slave->dev, &temp); 3344 3345 bond_fold_stats(stats, new, &slave->slave_stats); 3346 3347 /* save off the slave stats for the next run */ 3348 memcpy(&slave->slave_stats, new, sizeof(*new)); 3349 } 3350 rcu_read_unlock(); 3351 3352 memcpy(&bond->bond_stats, stats, sizeof(*stats)); 3353 spin_unlock(&bond->stats_lock); 3354 3355 return stats; 3356 } 3357 3358 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 3359 { 3360 struct bonding *bond = netdev_priv(bond_dev); 3361 struct net_device *slave_dev = NULL; 3362 struct ifbond k_binfo; 3363 struct ifbond __user *u_binfo = NULL; 3364 struct ifslave k_sinfo; 3365 struct ifslave __user *u_sinfo = NULL; 3366 struct mii_ioctl_data *mii = NULL; 3367 struct bond_opt_value newval; 3368 struct net *net; 3369 int res = 0; 3370 3371 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd); 3372 3373 switch (cmd) { 3374 case SIOCGMIIPHY: 3375 mii = if_mii(ifr); 3376 if (!mii) 3377 return -EINVAL; 3378 3379 mii->phy_id = 0; 3380 /* Fall Through */ 3381 case SIOCGMIIREG: 3382 /* We do this again just in case we were called by SIOCGMIIREG 3383 * instead of SIOCGMIIPHY. 3384 */ 3385 mii = if_mii(ifr); 3386 if (!mii) 3387 return -EINVAL; 3388 3389 if (mii->reg_num == 1) { 3390 mii->val_out = 0; 3391 if (netif_carrier_ok(bond->dev)) 3392 mii->val_out = BMSR_LSTATUS; 3393 } 3394 3395 return 0; 3396 case BOND_INFO_QUERY_OLD: 3397 case SIOCBONDINFOQUERY: 3398 u_binfo = (struct ifbond __user *)ifr->ifr_data; 3399 3400 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 3401 return -EFAULT; 3402 3403 res = bond_info_query(bond_dev, &k_binfo); 3404 if (res == 0 && 3405 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 3406 return -EFAULT; 3407 3408 return res; 3409 case BOND_SLAVE_INFO_QUERY_OLD: 3410 case SIOCBONDSLAVEINFOQUERY: 3411 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 3412 3413 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 3414 return -EFAULT; 3415 3416 res = bond_slave_info_query(bond_dev, &k_sinfo); 3417 if (res == 0 && 3418 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 3419 return -EFAULT; 3420 3421 return res; 3422 default: 3423 break; 3424 } 3425 3426 net = dev_net(bond_dev); 3427 3428 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3429 return -EPERM; 3430 3431 slave_dev = __dev_get_by_name(net, ifr->ifr_slave); 3432 3433 netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev); 3434 3435 if (!slave_dev) 3436 return -ENODEV; 3437 3438 netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name); 3439 switch (cmd) { 3440 case BOND_ENSLAVE_OLD: 3441 case SIOCBONDENSLAVE: 3442 res = bond_enslave(bond_dev, slave_dev); 3443 break; 3444 case BOND_RELEASE_OLD: 3445 case SIOCBONDRELEASE: 3446 res = bond_release(bond_dev, slave_dev); 3447 break; 3448 case BOND_SETHWADDR_OLD: 3449 case SIOCBONDSETHWADDR: 3450 bond_set_dev_addr(bond_dev, slave_dev); 3451 res = 0; 3452 break; 3453 case BOND_CHANGE_ACTIVE_OLD: 3454 case SIOCBONDCHANGEACTIVE: 3455 bond_opt_initstr(&newval, slave_dev->name); 3456 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval); 3457 break; 3458 default: 3459 res = -EOPNOTSUPP; 3460 } 3461 3462 return res; 3463 } 3464 3465 static void bond_change_rx_flags(struct net_device *bond_dev, int change) 3466 { 3467 struct bonding *bond = netdev_priv(bond_dev); 3468 3469 if (change & IFF_PROMISC) 3470 bond_set_promiscuity(bond, 3471 bond_dev->flags & IFF_PROMISC ? 1 : -1); 3472 3473 if (change & IFF_ALLMULTI) 3474 bond_set_allmulti(bond, 3475 bond_dev->flags & IFF_ALLMULTI ? 1 : -1); 3476 } 3477 3478 static void bond_set_rx_mode(struct net_device *bond_dev) 3479 { 3480 struct bonding *bond = netdev_priv(bond_dev); 3481 struct list_head *iter; 3482 struct slave *slave; 3483 3484 rcu_read_lock(); 3485 if (bond_uses_primary(bond)) { 3486 slave = rcu_dereference(bond->curr_active_slave); 3487 if (slave) { 3488 dev_uc_sync(slave->dev, bond_dev); 3489 dev_mc_sync(slave->dev, bond_dev); 3490 } 3491 } else { 3492 bond_for_each_slave_rcu(bond, slave, iter) { 3493 dev_uc_sync_multiple(slave->dev, bond_dev); 3494 dev_mc_sync_multiple(slave->dev, bond_dev); 3495 } 3496 } 3497 rcu_read_unlock(); 3498 } 3499 3500 static int bond_neigh_init(struct neighbour *n) 3501 { 3502 struct bonding *bond = netdev_priv(n->dev); 3503 const struct net_device_ops *slave_ops; 3504 struct neigh_parms parms; 3505 struct slave *slave; 3506 int ret; 3507 3508 slave = bond_first_slave(bond); 3509 if (!slave) 3510 return 0; 3511 slave_ops = slave->dev->netdev_ops; 3512 if (!slave_ops->ndo_neigh_setup) 3513 return 0; 3514 3515 parms.neigh_setup = NULL; 3516 parms.neigh_cleanup = NULL; 3517 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); 3518 if (ret) 3519 return ret; 3520 3521 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called 3522 * after the last slave has been detached. Assumes that all slaves 3523 * utilize the same neigh_cleanup (true at this writing as only user 3524 * is ipoib). 3525 */ 3526 n->parms->neigh_cleanup = parms.neigh_cleanup; 3527 3528 if (!parms.neigh_setup) 3529 return 0; 3530 3531 return parms.neigh_setup(n); 3532 } 3533 3534 /* The bonding ndo_neigh_setup is called at init time beofre any 3535 * slave exists. So we must declare proxy setup function which will 3536 * be used at run time to resolve the actual slave neigh param setup. 3537 * 3538 * It's also called by master devices (such as vlans) to setup their 3539 * underlying devices. In that case - do nothing, we're already set up from 3540 * our init. 3541 */ 3542 static int bond_neigh_setup(struct net_device *dev, 3543 struct neigh_parms *parms) 3544 { 3545 /* modify only our neigh_parms */ 3546 if (parms->dev == dev) 3547 parms->neigh_setup = bond_neigh_init; 3548 3549 return 0; 3550 } 3551 3552 /* Change the MTU of all of a master's slaves to match the master */ 3553 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 3554 { 3555 struct bonding *bond = netdev_priv(bond_dev); 3556 struct slave *slave, *rollback_slave; 3557 struct list_head *iter; 3558 int res = 0; 3559 3560 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu); 3561 3562 bond_for_each_slave(bond, slave, iter) { 3563 netdev_dbg(bond_dev, "s %p c_m %p\n", 3564 slave, slave->dev->netdev_ops->ndo_change_mtu); 3565 3566 res = dev_set_mtu(slave->dev, new_mtu); 3567 3568 if (res) { 3569 /* If we failed to set the slave's mtu to the new value 3570 * we must abort the operation even in ACTIVE_BACKUP 3571 * mode, because if we allow the backup slaves to have 3572 * different mtu values than the active slave we'll 3573 * need to change their mtu when doing a failover. That 3574 * means changing their mtu from timer context, which 3575 * is probably not a good idea. 3576 */ 3577 netdev_dbg(bond_dev, "err %d %s\n", res, 3578 slave->dev->name); 3579 goto unwind; 3580 } 3581 } 3582 3583 bond_dev->mtu = new_mtu; 3584 3585 return 0; 3586 3587 unwind: 3588 /* unwind from head to the slave that failed */ 3589 bond_for_each_slave(bond, rollback_slave, iter) { 3590 int tmp_res; 3591 3592 if (rollback_slave == slave) 3593 break; 3594 3595 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu); 3596 if (tmp_res) { 3597 netdev_dbg(bond_dev, "unwind err %d dev %s\n", 3598 tmp_res, rollback_slave->dev->name); 3599 } 3600 } 3601 3602 return res; 3603 } 3604 3605 /* Change HW address 3606 * 3607 * Note that many devices must be down to change the HW address, and 3608 * downing the master releases all slaves. We can make bonds full of 3609 * bonding devices to test this, however. 3610 */ 3611 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 3612 { 3613 struct bonding *bond = netdev_priv(bond_dev); 3614 struct slave *slave, *rollback_slave; 3615 struct sockaddr *sa = addr, tmp_sa; 3616 struct list_head *iter; 3617 int res = 0; 3618 3619 if (BOND_MODE(bond) == BOND_MODE_ALB) 3620 return bond_alb_set_mac_address(bond_dev, addr); 3621 3622 3623 netdev_dbg(bond_dev, "bond=%p\n", bond); 3624 3625 /* If fail_over_mac is enabled, do nothing and return success. 3626 * Returning an error causes ifenslave to fail. 3627 */ 3628 if (bond->params.fail_over_mac && 3629 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3630 return 0; 3631 3632 if (!is_valid_ether_addr(sa->sa_data)) 3633 return -EADDRNOTAVAIL; 3634 3635 bond_for_each_slave(bond, slave, iter) { 3636 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name); 3637 res = dev_set_mac_address(slave->dev, addr); 3638 if (res) { 3639 /* TODO: consider downing the slave 3640 * and retry ? 3641 * User should expect communications 3642 * breakage anyway until ARP finish 3643 * updating, so... 3644 */ 3645 netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name); 3646 goto unwind; 3647 } 3648 } 3649 3650 /* success */ 3651 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); 3652 return 0; 3653 3654 unwind: 3655 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 3656 tmp_sa.sa_family = bond_dev->type; 3657 3658 /* unwind from head to the slave that failed */ 3659 bond_for_each_slave(bond, rollback_slave, iter) { 3660 int tmp_res; 3661 3662 if (rollback_slave == slave) 3663 break; 3664 3665 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa); 3666 if (tmp_res) { 3667 netdev_dbg(bond_dev, "unwind err %d dev %s\n", 3668 tmp_res, rollback_slave->dev->name); 3669 } 3670 } 3671 3672 return res; 3673 } 3674 3675 /** 3676 * bond_xmit_slave_id - transmit skb through slave with slave_id 3677 * @bond: bonding device that is transmitting 3678 * @skb: buffer to transmit 3679 * @slave_id: slave id up to slave_cnt-1 through which to transmit 3680 * 3681 * This function tries to transmit through slave with slave_id but in case 3682 * it fails, it tries to find the first available slave for transmission. 3683 * The skb is consumed in all cases, thus the function is void. 3684 */ 3685 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id) 3686 { 3687 struct list_head *iter; 3688 struct slave *slave; 3689 int i = slave_id; 3690 3691 /* Here we start from the slave with slave_id */ 3692 bond_for_each_slave_rcu(bond, slave, iter) { 3693 if (--i < 0) { 3694 if (bond_slave_can_tx(slave)) { 3695 bond_dev_queue_xmit(bond, skb, slave->dev); 3696 return; 3697 } 3698 } 3699 } 3700 3701 /* Here we start from the first slave up to slave_id */ 3702 i = slave_id; 3703 bond_for_each_slave_rcu(bond, slave, iter) { 3704 if (--i < 0) 3705 break; 3706 if (bond_slave_can_tx(slave)) { 3707 bond_dev_queue_xmit(bond, skb, slave->dev); 3708 return; 3709 } 3710 } 3711 /* no slave that can tx has been found */ 3712 bond_tx_drop(bond->dev, skb); 3713 } 3714 3715 /** 3716 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave 3717 * @bond: bonding device to use 3718 * 3719 * Based on the value of the bonding device's packets_per_slave parameter 3720 * this function generates a slave id, which is usually used as the next 3721 * slave to transmit through. 3722 */ 3723 static u32 bond_rr_gen_slave_id(struct bonding *bond) 3724 { 3725 u32 slave_id; 3726 struct reciprocal_value reciprocal_packets_per_slave; 3727 int packets_per_slave = bond->params.packets_per_slave; 3728 3729 switch (packets_per_slave) { 3730 case 0: 3731 slave_id = prandom_u32(); 3732 break; 3733 case 1: 3734 slave_id = bond->rr_tx_counter; 3735 break; 3736 default: 3737 reciprocal_packets_per_slave = 3738 bond->params.reciprocal_packets_per_slave; 3739 slave_id = reciprocal_divide(bond->rr_tx_counter, 3740 reciprocal_packets_per_slave); 3741 break; 3742 } 3743 bond->rr_tx_counter++; 3744 3745 return slave_id; 3746 } 3747 3748 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev) 3749 { 3750 struct bonding *bond = netdev_priv(bond_dev); 3751 struct iphdr *iph = ip_hdr(skb); 3752 struct slave *slave; 3753 u32 slave_id; 3754 3755 /* Start with the curr_active_slave that joined the bond as the 3756 * default for sending IGMP traffic. For failover purposes one 3757 * needs to maintain some consistency for the interface that will 3758 * send the join/membership reports. The curr_active_slave found 3759 * will send all of this type of traffic. 3760 */ 3761 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) { 3762 slave = rcu_dereference(bond->curr_active_slave); 3763 if (slave) 3764 bond_dev_queue_xmit(bond, skb, slave->dev); 3765 else 3766 bond_xmit_slave_id(bond, skb, 0); 3767 } else { 3768 int slave_cnt = ACCESS_ONCE(bond->slave_cnt); 3769 3770 if (likely(slave_cnt)) { 3771 slave_id = bond_rr_gen_slave_id(bond); 3772 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt); 3773 } else { 3774 bond_tx_drop(bond_dev, skb); 3775 } 3776 } 3777 3778 return NETDEV_TX_OK; 3779 } 3780 3781 /* In active-backup mode, we know that bond->curr_active_slave is always valid if 3782 * the bond has a usable interface. 3783 */ 3784 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev) 3785 { 3786 struct bonding *bond = netdev_priv(bond_dev); 3787 struct slave *slave; 3788 3789 slave = rcu_dereference(bond->curr_active_slave); 3790 if (slave) 3791 bond_dev_queue_xmit(bond, skb, slave->dev); 3792 else 3793 bond_tx_drop(bond_dev, skb); 3794 3795 return NETDEV_TX_OK; 3796 } 3797 3798 /* Use this to update slave_array when (a) it's not appropriate to update 3799 * slave_array right away (note that update_slave_array() may sleep) 3800 * and / or (b) RTNL is not held. 3801 */ 3802 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay) 3803 { 3804 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay); 3805 } 3806 3807 /* Slave array work handler. Holds only RTNL */ 3808 static void bond_slave_arr_handler(struct work_struct *work) 3809 { 3810 struct bonding *bond = container_of(work, struct bonding, 3811 slave_arr_work.work); 3812 int ret; 3813 3814 if (!rtnl_trylock()) 3815 goto err; 3816 3817 ret = bond_update_slave_arr(bond, NULL); 3818 rtnl_unlock(); 3819 if (ret) { 3820 pr_warn_ratelimited("Failed to update slave array from WT\n"); 3821 goto err; 3822 } 3823 return; 3824 3825 err: 3826 bond_slave_arr_work_rearm(bond, 1); 3827 } 3828 3829 /* Build the usable slaves array in control path for modes that use xmit-hash 3830 * to determine the slave interface - 3831 * (a) BOND_MODE_8023AD 3832 * (b) BOND_MODE_XOR 3833 * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0 3834 * 3835 * The caller is expected to hold RTNL only and NO other lock! 3836 */ 3837 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave) 3838 { 3839 struct slave *slave; 3840 struct list_head *iter; 3841 struct bond_up_slave *new_arr, *old_arr; 3842 int agg_id = 0; 3843 int ret = 0; 3844 3845 #ifdef CONFIG_LOCKDEP 3846 WARN_ON(lockdep_is_held(&bond->mode_lock)); 3847 #endif 3848 3849 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]), 3850 GFP_KERNEL); 3851 if (!new_arr) { 3852 ret = -ENOMEM; 3853 pr_err("Failed to build slave-array.\n"); 3854 goto out; 3855 } 3856 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3857 struct ad_info ad_info; 3858 3859 if (bond_3ad_get_active_agg_info(bond, &ad_info)) { 3860 pr_debug("bond_3ad_get_active_agg_info failed\n"); 3861 kfree_rcu(new_arr, rcu); 3862 /* No active aggragator means it's not safe to use 3863 * the previous array. 3864 */ 3865 old_arr = rtnl_dereference(bond->slave_arr); 3866 if (old_arr) { 3867 RCU_INIT_POINTER(bond->slave_arr, NULL); 3868 kfree_rcu(old_arr, rcu); 3869 } 3870 goto out; 3871 } 3872 agg_id = ad_info.aggregator_id; 3873 } 3874 bond_for_each_slave(bond, slave, iter) { 3875 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3876 struct aggregator *agg; 3877 3878 agg = SLAVE_AD_INFO(slave)->port.aggregator; 3879 if (!agg || agg->aggregator_identifier != agg_id) 3880 continue; 3881 } 3882 if (!bond_slave_can_tx(slave)) 3883 continue; 3884 if (skipslave == slave) 3885 continue; 3886 new_arr->arr[new_arr->count++] = slave; 3887 } 3888 3889 old_arr = rtnl_dereference(bond->slave_arr); 3890 rcu_assign_pointer(bond->slave_arr, new_arr); 3891 if (old_arr) 3892 kfree_rcu(old_arr, rcu); 3893 out: 3894 if (ret != 0 && skipslave) { 3895 int idx; 3896 3897 /* Rare situation where caller has asked to skip a specific 3898 * slave but allocation failed (most likely!). BTW this is 3899 * only possible when the call is initiated from 3900 * __bond_release_one(). In this situation; overwrite the 3901 * skipslave entry in the array with the last entry from the 3902 * array to avoid a situation where the xmit path may choose 3903 * this to-be-skipped slave to send a packet out. 3904 */ 3905 old_arr = rtnl_dereference(bond->slave_arr); 3906 for (idx = 0; idx < old_arr->count; idx++) { 3907 if (skipslave == old_arr->arr[idx]) { 3908 old_arr->arr[idx] = 3909 old_arr->arr[old_arr->count-1]; 3910 old_arr->count--; 3911 break; 3912 } 3913 } 3914 } 3915 return ret; 3916 } 3917 3918 /* Use this Xmit function for 3AD as well as XOR modes. The current 3919 * usable slave array is formed in the control path. The xmit function 3920 * just calculates hash and sends the packet out. 3921 */ 3922 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev) 3923 { 3924 struct bonding *bond = netdev_priv(dev); 3925 struct slave *slave; 3926 struct bond_up_slave *slaves; 3927 unsigned int count; 3928 3929 slaves = rcu_dereference(bond->slave_arr); 3930 count = slaves ? ACCESS_ONCE(slaves->count) : 0; 3931 if (likely(count)) { 3932 slave = slaves->arr[bond_xmit_hash(bond, skb) % count]; 3933 bond_dev_queue_xmit(bond, skb, slave->dev); 3934 } else { 3935 bond_tx_drop(dev, skb); 3936 } 3937 3938 return NETDEV_TX_OK; 3939 } 3940 3941 /* in broadcast mode, we send everything to all usable interfaces. */ 3942 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev) 3943 { 3944 struct bonding *bond = netdev_priv(bond_dev); 3945 struct slave *slave = NULL; 3946 struct list_head *iter; 3947 3948 bond_for_each_slave_rcu(bond, slave, iter) { 3949 if (bond_is_last_slave(bond, slave)) 3950 break; 3951 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 3952 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 3953 3954 if (!skb2) { 3955 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n", 3956 bond_dev->name, __func__); 3957 continue; 3958 } 3959 bond_dev_queue_xmit(bond, skb2, slave->dev); 3960 } 3961 } 3962 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) 3963 bond_dev_queue_xmit(bond, skb, slave->dev); 3964 else 3965 bond_tx_drop(bond_dev, skb); 3966 3967 return NETDEV_TX_OK; 3968 } 3969 3970 /*------------------------- Device initialization ---------------------------*/ 3971 3972 /* Lookup the slave that corresponds to a qid */ 3973 static inline int bond_slave_override(struct bonding *bond, 3974 struct sk_buff *skb) 3975 { 3976 struct slave *slave = NULL; 3977 struct list_head *iter; 3978 3979 if (!skb->queue_mapping) 3980 return 1; 3981 3982 /* Find out if any slaves have the same mapping as this skb. */ 3983 bond_for_each_slave_rcu(bond, slave, iter) { 3984 if (slave->queue_id == skb->queue_mapping) { 3985 if (bond_slave_is_up(slave) && 3986 slave->link == BOND_LINK_UP) { 3987 bond_dev_queue_xmit(bond, skb, slave->dev); 3988 return 0; 3989 } 3990 /* If the slave isn't UP, use default transmit policy. */ 3991 break; 3992 } 3993 } 3994 3995 return 1; 3996 } 3997 3998 3999 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb, 4000 void *accel_priv, select_queue_fallback_t fallback) 4001 { 4002 /* This helper function exists to help dev_pick_tx get the correct 4003 * destination queue. Using a helper function skips a call to 4004 * skb_tx_hash and will put the skbs in the queue we expect on their 4005 * way down to the bonding driver. 4006 */ 4007 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 4008 4009 /* Save the original txq to restore before passing to the driver */ 4010 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping; 4011 4012 if (unlikely(txq >= dev->real_num_tx_queues)) { 4013 do { 4014 txq -= dev->real_num_tx_queues; 4015 } while (txq >= dev->real_num_tx_queues); 4016 } 4017 return txq; 4018 } 4019 4020 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4021 { 4022 struct bonding *bond = netdev_priv(dev); 4023 4024 if (bond_should_override_tx_queue(bond) && 4025 !bond_slave_override(bond, skb)) 4026 return NETDEV_TX_OK; 4027 4028 switch (BOND_MODE(bond)) { 4029 case BOND_MODE_ROUNDROBIN: 4030 return bond_xmit_roundrobin(skb, dev); 4031 case BOND_MODE_ACTIVEBACKUP: 4032 return bond_xmit_activebackup(skb, dev); 4033 case BOND_MODE_8023AD: 4034 case BOND_MODE_XOR: 4035 return bond_3ad_xor_xmit(skb, dev); 4036 case BOND_MODE_BROADCAST: 4037 return bond_xmit_broadcast(skb, dev); 4038 case BOND_MODE_ALB: 4039 return bond_alb_xmit(skb, dev); 4040 case BOND_MODE_TLB: 4041 return bond_tlb_xmit(skb, dev); 4042 default: 4043 /* Should never happen, mode already checked */ 4044 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond)); 4045 WARN_ON_ONCE(1); 4046 bond_tx_drop(dev, skb); 4047 return NETDEV_TX_OK; 4048 } 4049 } 4050 4051 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4052 { 4053 struct bonding *bond = netdev_priv(dev); 4054 netdev_tx_t ret = NETDEV_TX_OK; 4055 4056 /* If we risk deadlock from transmitting this in the 4057 * netpoll path, tell netpoll to queue the frame for later tx 4058 */ 4059 if (unlikely(is_netpoll_tx_blocked(dev))) 4060 return NETDEV_TX_BUSY; 4061 4062 rcu_read_lock(); 4063 if (bond_has_slaves(bond)) 4064 ret = __bond_start_xmit(skb, dev); 4065 else 4066 bond_tx_drop(dev, skb); 4067 rcu_read_unlock(); 4068 4069 return ret; 4070 } 4071 4072 static int bond_ethtool_get_settings(struct net_device *bond_dev, 4073 struct ethtool_cmd *ecmd) 4074 { 4075 struct bonding *bond = netdev_priv(bond_dev); 4076 unsigned long speed = 0; 4077 struct list_head *iter; 4078 struct slave *slave; 4079 4080 ecmd->duplex = DUPLEX_UNKNOWN; 4081 ecmd->port = PORT_OTHER; 4082 4083 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we 4084 * do not need to check mode. Though link speed might not represent 4085 * the true receive or transmit bandwidth (not all modes are symmetric) 4086 * this is an accurate maximum. 4087 */ 4088 bond_for_each_slave(bond, slave, iter) { 4089 if (bond_slave_can_tx(slave)) { 4090 if (slave->speed != SPEED_UNKNOWN) 4091 speed += slave->speed; 4092 if (ecmd->duplex == DUPLEX_UNKNOWN && 4093 slave->duplex != DUPLEX_UNKNOWN) 4094 ecmd->duplex = slave->duplex; 4095 } 4096 } 4097 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN); 4098 4099 return 0; 4100 } 4101 4102 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 4103 struct ethtool_drvinfo *drvinfo) 4104 { 4105 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver)); 4106 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version)); 4107 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d", 4108 BOND_ABI_VERSION); 4109 } 4110 4111 static const struct ethtool_ops bond_ethtool_ops = { 4112 .get_drvinfo = bond_ethtool_get_drvinfo, 4113 .get_settings = bond_ethtool_get_settings, 4114 .get_link = ethtool_op_get_link, 4115 }; 4116 4117 static const struct net_device_ops bond_netdev_ops = { 4118 .ndo_init = bond_init, 4119 .ndo_uninit = bond_uninit, 4120 .ndo_open = bond_open, 4121 .ndo_stop = bond_close, 4122 .ndo_start_xmit = bond_start_xmit, 4123 .ndo_select_queue = bond_select_queue, 4124 .ndo_get_stats64 = bond_get_stats, 4125 .ndo_do_ioctl = bond_do_ioctl, 4126 .ndo_change_rx_flags = bond_change_rx_flags, 4127 .ndo_set_rx_mode = bond_set_rx_mode, 4128 .ndo_change_mtu = bond_change_mtu, 4129 .ndo_set_mac_address = bond_set_mac_address, 4130 .ndo_neigh_setup = bond_neigh_setup, 4131 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 4132 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 4133 #ifdef CONFIG_NET_POLL_CONTROLLER 4134 .ndo_netpoll_setup = bond_netpoll_setup, 4135 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 4136 .ndo_poll_controller = bond_poll_controller, 4137 #endif 4138 .ndo_add_slave = bond_enslave, 4139 .ndo_del_slave = bond_release, 4140 .ndo_fix_features = bond_fix_features, 4141 .ndo_bridge_setlink = switchdev_port_bridge_setlink, 4142 .ndo_bridge_getlink = switchdev_port_bridge_getlink, 4143 .ndo_bridge_dellink = switchdev_port_bridge_dellink, 4144 .ndo_fdb_add = switchdev_port_fdb_add, 4145 .ndo_fdb_del = switchdev_port_fdb_del, 4146 .ndo_fdb_dump = switchdev_port_fdb_dump, 4147 .ndo_features_check = passthru_features_check, 4148 }; 4149 4150 static const struct device_type bond_type = { 4151 .name = "bond", 4152 }; 4153 4154 static void bond_destructor(struct net_device *bond_dev) 4155 { 4156 struct bonding *bond = netdev_priv(bond_dev); 4157 if (bond->wq) 4158 destroy_workqueue(bond->wq); 4159 free_netdev(bond_dev); 4160 } 4161 4162 void bond_setup(struct net_device *bond_dev) 4163 { 4164 struct bonding *bond = netdev_priv(bond_dev); 4165 4166 spin_lock_init(&bond->mode_lock); 4167 spin_lock_init(&bond->stats_lock); 4168 bond->params = bonding_defaults; 4169 4170 /* Initialize pointers */ 4171 bond->dev = bond_dev; 4172 4173 /* Initialize the device entry points */ 4174 ether_setup(bond_dev); 4175 bond_dev->netdev_ops = &bond_netdev_ops; 4176 bond_dev->ethtool_ops = &bond_ethtool_ops; 4177 4178 bond_dev->destructor = bond_destructor; 4179 4180 SET_NETDEV_DEVTYPE(bond_dev, &bond_type); 4181 4182 /* Initialize the device options */ 4183 bond_dev->flags |= IFF_MASTER; 4184 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE; 4185 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 4186 4187 /* don't acquire bond device's netif_tx_lock when transmitting */ 4188 bond_dev->features |= NETIF_F_LLTX; 4189 4190 /* By default, we declare the bond to be fully 4191 * VLAN hardware accelerated capable. Special 4192 * care is taken in the various xmit functions 4193 * when there are slaves that are not hw accel 4194 * capable 4195 */ 4196 4197 /* Don't allow bond devices to change network namespaces. */ 4198 bond_dev->features |= NETIF_F_NETNS_LOCAL; 4199 4200 bond_dev->hw_features = BOND_VLAN_FEATURES | 4201 NETIF_F_HW_VLAN_CTAG_TX | 4202 NETIF_F_HW_VLAN_CTAG_RX | 4203 NETIF_F_HW_VLAN_CTAG_FILTER; 4204 4205 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL; 4206 bond_dev->features |= bond_dev->hw_features; 4207 } 4208 4209 /* Destroy a bonding device. 4210 * Must be under rtnl_lock when this function is called. 4211 */ 4212 static void bond_uninit(struct net_device *bond_dev) 4213 { 4214 struct bonding *bond = netdev_priv(bond_dev); 4215 struct list_head *iter; 4216 struct slave *slave; 4217 struct bond_up_slave *arr; 4218 4219 bond_netpoll_cleanup(bond_dev); 4220 4221 /* Release the bonded slaves */ 4222 bond_for_each_slave(bond, slave, iter) 4223 __bond_release_one(bond_dev, slave->dev, true); 4224 netdev_info(bond_dev, "Released all slaves\n"); 4225 4226 arr = rtnl_dereference(bond->slave_arr); 4227 if (arr) { 4228 RCU_INIT_POINTER(bond->slave_arr, NULL); 4229 kfree_rcu(arr, rcu); 4230 } 4231 4232 list_del(&bond->bond_list); 4233 4234 bond_debug_unregister(bond); 4235 } 4236 4237 /*------------------------- Module initialization ---------------------------*/ 4238 4239 static int bond_check_params(struct bond_params *params) 4240 { 4241 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i; 4242 struct bond_opt_value newval; 4243 const struct bond_opt_value *valptr; 4244 int arp_all_targets_value; 4245 u16 ad_actor_sys_prio = 0; 4246 u16 ad_user_port_key = 0; 4247 4248 /* Convert string parameters. */ 4249 if (mode) { 4250 bond_opt_initstr(&newval, mode); 4251 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval); 4252 if (!valptr) { 4253 pr_err("Error: Invalid bonding mode \"%s\"\n", mode); 4254 return -EINVAL; 4255 } 4256 bond_mode = valptr->value; 4257 } 4258 4259 if (xmit_hash_policy) { 4260 if ((bond_mode != BOND_MODE_XOR) && 4261 (bond_mode != BOND_MODE_8023AD) && 4262 (bond_mode != BOND_MODE_TLB)) { 4263 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 4264 bond_mode_name(bond_mode)); 4265 } else { 4266 bond_opt_initstr(&newval, xmit_hash_policy); 4267 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH), 4268 &newval); 4269 if (!valptr) { 4270 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 4271 xmit_hash_policy); 4272 return -EINVAL; 4273 } 4274 xmit_hashtype = valptr->value; 4275 } 4276 } 4277 4278 if (lacp_rate) { 4279 if (bond_mode != BOND_MODE_8023AD) { 4280 pr_info("lacp_rate param is irrelevant in mode %s\n", 4281 bond_mode_name(bond_mode)); 4282 } else { 4283 bond_opt_initstr(&newval, lacp_rate); 4284 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE), 4285 &newval); 4286 if (!valptr) { 4287 pr_err("Error: Invalid lacp rate \"%s\"\n", 4288 lacp_rate); 4289 return -EINVAL; 4290 } 4291 lacp_fast = valptr->value; 4292 } 4293 } 4294 4295 if (ad_select) { 4296 bond_opt_initstr(&newval, ad_select); 4297 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT), 4298 &newval); 4299 if (!valptr) { 4300 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select); 4301 return -EINVAL; 4302 } 4303 params->ad_select = valptr->value; 4304 if (bond_mode != BOND_MODE_8023AD) 4305 pr_warn("ad_select param only affects 802.3ad mode\n"); 4306 } else { 4307 params->ad_select = BOND_AD_STABLE; 4308 } 4309 4310 if (max_bonds < 0) { 4311 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 4312 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 4313 max_bonds = BOND_DEFAULT_MAX_BONDS; 4314 } 4315 4316 if (miimon < 0) { 4317 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4318 miimon, INT_MAX); 4319 miimon = 0; 4320 } 4321 4322 if (updelay < 0) { 4323 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4324 updelay, INT_MAX); 4325 updelay = 0; 4326 } 4327 4328 if (downdelay < 0) { 4329 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4330 downdelay, INT_MAX); 4331 downdelay = 0; 4332 } 4333 4334 if ((use_carrier != 0) && (use_carrier != 1)) { 4335 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 4336 use_carrier); 4337 use_carrier = 1; 4338 } 4339 4340 if (num_peer_notif < 0 || num_peer_notif > 255) { 4341 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 4342 num_peer_notif); 4343 num_peer_notif = 1; 4344 } 4345 4346 /* reset values for 802.3ad/TLB/ALB */ 4347 if (!bond_mode_uses_arp(bond_mode)) { 4348 if (!miimon) { 4349 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"); 4350 pr_warn("Forcing miimon to 100msec\n"); 4351 miimon = BOND_DEFAULT_MIIMON; 4352 } 4353 } 4354 4355 if (tx_queues < 1 || tx_queues > 255) { 4356 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n", 4357 tx_queues, BOND_DEFAULT_TX_QUEUES); 4358 tx_queues = BOND_DEFAULT_TX_QUEUES; 4359 } 4360 4361 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 4362 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n", 4363 all_slaves_active); 4364 all_slaves_active = 0; 4365 } 4366 4367 if (resend_igmp < 0 || resend_igmp > 255) { 4368 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n", 4369 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 4370 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 4371 } 4372 4373 bond_opt_initval(&newval, packets_per_slave); 4374 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) { 4375 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n", 4376 packets_per_slave, USHRT_MAX); 4377 packets_per_slave = 1; 4378 } 4379 4380 if (bond_mode == BOND_MODE_ALB) { 4381 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", 4382 updelay); 4383 } 4384 4385 if (!miimon) { 4386 if (updelay || downdelay) { 4387 /* just warn the user the up/down delay will have 4388 * no effect since miimon is zero... 4389 */ 4390 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", 4391 updelay, downdelay); 4392 } 4393 } else { 4394 /* don't allow arp monitoring */ 4395 if (arp_interval) { 4396 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 4397 miimon, arp_interval); 4398 arp_interval = 0; 4399 } 4400 4401 if ((updelay % miimon) != 0) { 4402 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 4403 updelay, miimon, (updelay / miimon) * miimon); 4404 } 4405 4406 updelay /= miimon; 4407 4408 if ((downdelay % miimon) != 0) { 4409 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 4410 downdelay, miimon, 4411 (downdelay / miimon) * miimon); 4412 } 4413 4414 downdelay /= miimon; 4415 } 4416 4417 if (arp_interval < 0) { 4418 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4419 arp_interval, INT_MAX); 4420 arp_interval = 0; 4421 } 4422 4423 for (arp_ip_count = 0, i = 0; 4424 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) { 4425 __be32 ip; 4426 4427 /* not a complete check, but good enough to catch mistakes */ 4428 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) || 4429 !bond_is_ip_target_ok(ip)) { 4430 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 4431 arp_ip_target[i]); 4432 arp_interval = 0; 4433 } else { 4434 if (bond_get_targets_ip(arp_target, ip) == -1) 4435 arp_target[arp_ip_count++] = ip; 4436 else 4437 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n", 4438 &ip); 4439 } 4440 } 4441 4442 if (arp_interval && !arp_ip_count) { 4443 /* don't allow arping if no arp_ip_target given... */ 4444 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 4445 arp_interval); 4446 arp_interval = 0; 4447 } 4448 4449 if (arp_validate) { 4450 if (!arp_interval) { 4451 pr_err("arp_validate requires arp_interval\n"); 4452 return -EINVAL; 4453 } 4454 4455 bond_opt_initstr(&newval, arp_validate); 4456 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE), 4457 &newval); 4458 if (!valptr) { 4459 pr_err("Error: invalid arp_validate \"%s\"\n", 4460 arp_validate); 4461 return -EINVAL; 4462 } 4463 arp_validate_value = valptr->value; 4464 } else { 4465 arp_validate_value = 0; 4466 } 4467 4468 arp_all_targets_value = 0; 4469 if (arp_all_targets) { 4470 bond_opt_initstr(&newval, arp_all_targets); 4471 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS), 4472 &newval); 4473 if (!valptr) { 4474 pr_err("Error: invalid arp_all_targets_value \"%s\"\n", 4475 arp_all_targets); 4476 arp_all_targets_value = 0; 4477 } else { 4478 arp_all_targets_value = valptr->value; 4479 } 4480 } 4481 4482 if (miimon) { 4483 pr_info("MII link monitoring set to %d ms\n", miimon); 4484 } else if (arp_interval) { 4485 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE, 4486 arp_validate_value); 4487 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 4488 arp_interval, valptr->string, arp_ip_count); 4489 4490 for (i = 0; i < arp_ip_count; i++) 4491 pr_cont(" %s", arp_ip_target[i]); 4492 4493 pr_cont("\n"); 4494 4495 } else if (max_bonds) { 4496 /* miimon and arp_interval not set, we need one so things 4497 * work as expected, see bonding.txt for details 4498 */ 4499 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"); 4500 } 4501 4502 if (primary && !bond_mode_uses_primary(bond_mode)) { 4503 /* currently, using a primary only makes sense 4504 * in active backup, TLB or ALB modes 4505 */ 4506 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n", 4507 primary, bond_mode_name(bond_mode)); 4508 primary = NULL; 4509 } 4510 4511 if (primary && primary_reselect) { 4512 bond_opt_initstr(&newval, primary_reselect); 4513 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT), 4514 &newval); 4515 if (!valptr) { 4516 pr_err("Error: Invalid primary_reselect \"%s\"\n", 4517 primary_reselect); 4518 return -EINVAL; 4519 } 4520 primary_reselect_value = valptr->value; 4521 } else { 4522 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 4523 } 4524 4525 if (fail_over_mac) { 4526 bond_opt_initstr(&newval, fail_over_mac); 4527 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC), 4528 &newval); 4529 if (!valptr) { 4530 pr_err("Error: invalid fail_over_mac \"%s\"\n", 4531 fail_over_mac); 4532 return -EINVAL; 4533 } 4534 fail_over_mac_value = valptr->value; 4535 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 4536 pr_warn("Warning: fail_over_mac only affects active-backup mode\n"); 4537 } else { 4538 fail_over_mac_value = BOND_FOM_NONE; 4539 } 4540 4541 bond_opt_initstr(&newval, "default"); 4542 valptr = bond_opt_parse( 4543 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO), 4544 &newval); 4545 if (!valptr) { 4546 pr_err("Error: No ad_actor_sys_prio default value"); 4547 return -EINVAL; 4548 } 4549 ad_actor_sys_prio = valptr->value; 4550 4551 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY), 4552 &newval); 4553 if (!valptr) { 4554 pr_err("Error: No ad_user_port_key default value"); 4555 return -EINVAL; 4556 } 4557 ad_user_port_key = valptr->value; 4558 4559 if (lp_interval == 0) { 4560 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n", 4561 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL); 4562 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 4563 } 4564 4565 /* fill params struct with the proper values */ 4566 params->mode = bond_mode; 4567 params->xmit_policy = xmit_hashtype; 4568 params->miimon = miimon; 4569 params->num_peer_notif = num_peer_notif; 4570 params->arp_interval = arp_interval; 4571 params->arp_validate = arp_validate_value; 4572 params->arp_all_targets = arp_all_targets_value; 4573 params->updelay = updelay; 4574 params->downdelay = downdelay; 4575 params->use_carrier = use_carrier; 4576 params->lacp_fast = lacp_fast; 4577 params->primary[0] = 0; 4578 params->primary_reselect = primary_reselect_value; 4579 params->fail_over_mac = fail_over_mac_value; 4580 params->tx_queues = tx_queues; 4581 params->all_slaves_active = all_slaves_active; 4582 params->resend_igmp = resend_igmp; 4583 params->min_links = min_links; 4584 params->lp_interval = lp_interval; 4585 params->packets_per_slave = packets_per_slave; 4586 params->tlb_dynamic_lb = 1; /* Default value */ 4587 params->ad_actor_sys_prio = ad_actor_sys_prio; 4588 eth_zero_addr(params->ad_actor_system); 4589 params->ad_user_port_key = ad_user_port_key; 4590 if (packets_per_slave > 0) { 4591 params->reciprocal_packets_per_slave = 4592 reciprocal_value(packets_per_slave); 4593 } else { 4594 /* reciprocal_packets_per_slave is unused if 4595 * packets_per_slave is 0 or 1, just initialize it 4596 */ 4597 params->reciprocal_packets_per_slave = 4598 (struct reciprocal_value) { 0 }; 4599 } 4600 4601 if (primary) { 4602 strncpy(params->primary, primary, IFNAMSIZ); 4603 params->primary[IFNAMSIZ - 1] = 0; 4604 } 4605 4606 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 4607 4608 return 0; 4609 } 4610 4611 static struct lock_class_key bonding_netdev_xmit_lock_key; 4612 static struct lock_class_key bonding_netdev_addr_lock_key; 4613 static struct lock_class_key bonding_tx_busylock_key; 4614 4615 static void bond_set_lockdep_class_one(struct net_device *dev, 4616 struct netdev_queue *txq, 4617 void *_unused) 4618 { 4619 lockdep_set_class(&txq->_xmit_lock, 4620 &bonding_netdev_xmit_lock_key); 4621 } 4622 4623 static void bond_set_lockdep_class(struct net_device *dev) 4624 { 4625 lockdep_set_class(&dev->addr_list_lock, 4626 &bonding_netdev_addr_lock_key); 4627 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL); 4628 dev->qdisc_tx_busylock = &bonding_tx_busylock_key; 4629 } 4630 4631 /* Called from registration process */ 4632 static int bond_init(struct net_device *bond_dev) 4633 { 4634 struct bonding *bond = netdev_priv(bond_dev); 4635 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 4636 4637 netdev_dbg(bond_dev, "Begin bond_init\n"); 4638 4639 bond->wq = create_singlethread_workqueue(bond_dev->name); 4640 if (!bond->wq) 4641 return -ENOMEM; 4642 4643 bond_set_lockdep_class(bond_dev); 4644 4645 list_add_tail(&bond->bond_list, &bn->dev_list); 4646 4647 bond_prepare_sysfs_group(bond); 4648 4649 bond_debug_register(bond); 4650 4651 /* Ensure valid dev_addr */ 4652 if (is_zero_ether_addr(bond_dev->dev_addr) && 4653 bond_dev->addr_assign_type == NET_ADDR_PERM) 4654 eth_hw_addr_random(bond_dev); 4655 4656 return 0; 4657 } 4658 4659 unsigned int bond_get_num_tx_queues(void) 4660 { 4661 return tx_queues; 4662 } 4663 4664 /* Create a new bond based on the specified name and bonding parameters. 4665 * If name is NULL, obtain a suitable "bond%d" name for us. 4666 * Caller must NOT hold rtnl_lock; we need to release it here before we 4667 * set up our sysfs entries. 4668 */ 4669 int bond_create(struct net *net, const char *name) 4670 { 4671 struct net_device *bond_dev; 4672 struct bonding *bond; 4673 struct alb_bond_info *bond_info; 4674 int res; 4675 4676 rtnl_lock(); 4677 4678 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 4679 name ? name : "bond%d", NET_NAME_UNKNOWN, 4680 bond_setup, tx_queues); 4681 if (!bond_dev) { 4682 pr_err("%s: eek! can't alloc netdev!\n", name); 4683 rtnl_unlock(); 4684 return -ENOMEM; 4685 } 4686 4687 /* 4688 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX. 4689 * It is set to 0 by default which is wrong. 4690 */ 4691 bond = netdev_priv(bond_dev); 4692 bond_info = &(BOND_ALB_INFO(bond)); 4693 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; 4694 4695 dev_net_set(bond_dev, net); 4696 bond_dev->rtnl_link_ops = &bond_link_ops; 4697 4698 res = register_netdevice(bond_dev); 4699 4700 netif_carrier_off(bond_dev); 4701 4702 rtnl_unlock(); 4703 if (res < 0) 4704 bond_destructor(bond_dev); 4705 return res; 4706 } 4707 4708 static int __net_init bond_net_init(struct net *net) 4709 { 4710 struct bond_net *bn = net_generic(net, bond_net_id); 4711 4712 bn->net = net; 4713 INIT_LIST_HEAD(&bn->dev_list); 4714 4715 bond_create_proc_dir(bn); 4716 bond_create_sysfs(bn); 4717 4718 return 0; 4719 } 4720 4721 static void __net_exit bond_net_exit(struct net *net) 4722 { 4723 struct bond_net *bn = net_generic(net, bond_net_id); 4724 struct bonding *bond, *tmp_bond; 4725 LIST_HEAD(list); 4726 4727 bond_destroy_sysfs(bn); 4728 4729 /* Kill off any bonds created after unregistering bond rtnl ops */ 4730 rtnl_lock(); 4731 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list) 4732 unregister_netdevice_queue(bond->dev, &list); 4733 unregister_netdevice_many(&list); 4734 rtnl_unlock(); 4735 4736 bond_destroy_proc_dir(bn); 4737 } 4738 4739 static struct pernet_operations bond_net_ops = { 4740 .init = bond_net_init, 4741 .exit = bond_net_exit, 4742 .id = &bond_net_id, 4743 .size = sizeof(struct bond_net), 4744 }; 4745 4746 static int __init bonding_init(void) 4747 { 4748 int i; 4749 int res; 4750 4751 pr_info("%s", bond_version); 4752 4753 res = bond_check_params(&bonding_defaults); 4754 if (res) 4755 goto out; 4756 4757 res = register_pernet_subsys(&bond_net_ops); 4758 if (res) 4759 goto out; 4760 4761 res = bond_netlink_init(); 4762 if (res) 4763 goto err_link; 4764 4765 bond_create_debugfs(); 4766 4767 for (i = 0; i < max_bonds; i++) { 4768 res = bond_create(&init_net, NULL); 4769 if (res) 4770 goto err; 4771 } 4772 4773 register_netdevice_notifier(&bond_netdev_notifier); 4774 out: 4775 return res; 4776 err: 4777 bond_destroy_debugfs(); 4778 bond_netlink_fini(); 4779 err_link: 4780 unregister_pernet_subsys(&bond_net_ops); 4781 goto out; 4782 4783 } 4784 4785 static void __exit bonding_exit(void) 4786 { 4787 unregister_netdevice_notifier(&bond_netdev_notifier); 4788 4789 bond_destroy_debugfs(); 4790 4791 bond_netlink_fini(); 4792 unregister_pernet_subsys(&bond_net_ops); 4793 4794 #ifdef CONFIG_NET_POLL_CONTROLLER 4795 /* Make sure we don't have an imbalance on our netpoll blocking */ 4796 WARN_ON(atomic_read(&netpoll_block_tx)); 4797 #endif 4798 } 4799 4800 module_init(bonding_init); 4801 module_exit(bonding_exit); 4802 MODULE_LICENSE("GPL"); 4803 MODULE_VERSION(DRV_VERSION); 4804 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION); 4805 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 4806