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 if (bond->params.miimon) { 1588 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { 1589 if (bond->params.updelay) { 1590 bond_set_slave_link_state(new_slave, 1591 BOND_LINK_BACK, 1592 BOND_SLAVE_NOTIFY_NOW); 1593 new_slave->delay = bond->params.updelay; 1594 } else { 1595 bond_set_slave_link_state(new_slave, 1596 BOND_LINK_UP, 1597 BOND_SLAVE_NOTIFY_NOW); 1598 } 1599 } else { 1600 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN, 1601 BOND_SLAVE_NOTIFY_NOW); 1602 } 1603 } else if (bond->params.arp_interval) { 1604 bond_set_slave_link_state(new_slave, 1605 (netif_carrier_ok(slave_dev) ? 1606 BOND_LINK_UP : BOND_LINK_DOWN), 1607 BOND_SLAVE_NOTIFY_NOW); 1608 } else { 1609 bond_set_slave_link_state(new_slave, BOND_LINK_UP, 1610 BOND_SLAVE_NOTIFY_NOW); 1611 } 1612 1613 if (new_slave->link != BOND_LINK_DOWN) 1614 new_slave->last_link_up = jiffies; 1615 netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n", 1616 new_slave->link == BOND_LINK_DOWN ? "DOWN" : 1617 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); 1618 1619 if (bond_uses_primary(bond) && bond->params.primary[0]) { 1620 /* if there is a primary slave, remember it */ 1621 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 1622 rcu_assign_pointer(bond->primary_slave, new_slave); 1623 bond->force_primary = true; 1624 } 1625 } 1626 1627 switch (BOND_MODE(bond)) { 1628 case BOND_MODE_ACTIVEBACKUP: 1629 bond_set_slave_inactive_flags(new_slave, 1630 BOND_SLAVE_NOTIFY_NOW); 1631 break; 1632 case BOND_MODE_8023AD: 1633 /* in 802.3ad mode, the internal mechanism 1634 * will activate the slaves in the selected 1635 * aggregator 1636 */ 1637 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 1638 /* if this is the first slave */ 1639 if (!prev_slave) { 1640 SLAVE_AD_INFO(new_slave)->id = 1; 1641 /* Initialize AD with the number of times that the AD timer is called in 1 second 1642 * can be called only after the mac address of the bond is set 1643 */ 1644 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL); 1645 } else { 1646 SLAVE_AD_INFO(new_slave)->id = 1647 SLAVE_AD_INFO(prev_slave)->id + 1; 1648 } 1649 1650 bond_3ad_bind_slave(new_slave); 1651 break; 1652 case BOND_MODE_TLB: 1653 case BOND_MODE_ALB: 1654 bond_set_active_slave(new_slave); 1655 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 1656 break; 1657 default: 1658 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n"); 1659 1660 /* always active in trunk mode */ 1661 bond_set_active_slave(new_slave); 1662 1663 /* In trunking mode there is little meaning to curr_active_slave 1664 * anyway (it holds no special properties of the bond device), 1665 * so we can change it without calling change_active_interface() 1666 */ 1667 if (!rcu_access_pointer(bond->curr_active_slave) && 1668 new_slave->link == BOND_LINK_UP) 1669 rcu_assign_pointer(bond->curr_active_slave, new_slave); 1670 1671 break; 1672 } /* switch(bond_mode) */ 1673 1674 #ifdef CONFIG_NET_POLL_CONTROLLER 1675 slave_dev->npinfo = bond->dev->npinfo; 1676 if (slave_dev->npinfo) { 1677 if (slave_enable_netpoll(new_slave)) { 1678 netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n"); 1679 res = -EBUSY; 1680 goto err_detach; 1681 } 1682 } 1683 #endif 1684 1685 if (!(bond_dev->features & NETIF_F_LRO)) 1686 dev_disable_lro(slave_dev); 1687 1688 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 1689 new_slave); 1690 if (res) { 1691 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res); 1692 goto err_detach; 1693 } 1694 1695 res = bond_master_upper_dev_link(bond, new_slave); 1696 if (res) { 1697 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res); 1698 goto err_unregister; 1699 } 1700 1701 res = bond_sysfs_slave_add(new_slave); 1702 if (res) { 1703 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res); 1704 goto err_upper_unlink; 1705 } 1706 1707 bond->slave_cnt++; 1708 bond_compute_features(bond); 1709 bond_set_carrier(bond); 1710 1711 if (bond_uses_primary(bond)) { 1712 block_netpoll_tx(); 1713 bond_select_active_slave(bond); 1714 unblock_netpoll_tx(); 1715 } 1716 1717 if (bond_mode_uses_xmit_hash(bond)) 1718 bond_update_slave_arr(bond, NULL); 1719 1720 netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n", 1721 slave_dev->name, 1722 bond_is_active_slave(new_slave) ? "an active" : "a backup", 1723 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down"); 1724 1725 /* enslave is successful */ 1726 bond_queue_slave_event(new_slave); 1727 return 0; 1728 1729 /* Undo stages on error */ 1730 err_upper_unlink: 1731 bond_upper_dev_unlink(bond, new_slave); 1732 1733 err_unregister: 1734 netdev_rx_handler_unregister(slave_dev); 1735 1736 err_detach: 1737 if (!bond_uses_primary(bond)) 1738 bond_hw_addr_flush(bond_dev, slave_dev); 1739 1740 vlan_vids_del_by_dev(slave_dev, bond_dev); 1741 if (rcu_access_pointer(bond->primary_slave) == new_slave) 1742 RCU_INIT_POINTER(bond->primary_slave, NULL); 1743 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) { 1744 block_netpoll_tx(); 1745 bond_change_active_slave(bond, NULL); 1746 bond_select_active_slave(bond); 1747 unblock_netpoll_tx(); 1748 } 1749 /* either primary_slave or curr_active_slave might've changed */ 1750 synchronize_rcu(); 1751 slave_disable_netpoll(new_slave); 1752 1753 err_close: 1754 slave_dev->priv_flags &= ~IFF_BONDING; 1755 dev_close(slave_dev); 1756 1757 err_restore_mac: 1758 slave_dev->flags &= ~IFF_SLAVE; 1759 if (!bond->params.fail_over_mac || 1760 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1761 /* XXX TODO - fom follow mode needs to change master's 1762 * MAC if this slave's MAC is in use by the bond, or at 1763 * least print a warning. 1764 */ 1765 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr); 1766 addr.sa_family = slave_dev->type; 1767 dev_set_mac_address(slave_dev, &addr); 1768 } 1769 1770 err_restore_mtu: 1771 dev_set_mtu(slave_dev, new_slave->original_mtu); 1772 1773 err_free: 1774 bond_free_slave(new_slave); 1775 1776 err_undo_flags: 1777 /* Enslave of first slave has failed and we need to fix master's mac */ 1778 if (!bond_has_slaves(bond)) { 1779 if (ether_addr_equal_64bits(bond_dev->dev_addr, 1780 slave_dev->dev_addr)) 1781 eth_hw_addr_random(bond_dev); 1782 if (bond_dev->type != ARPHRD_ETHER) { 1783 dev_close(bond_dev); 1784 ether_setup(bond_dev); 1785 bond_dev->flags |= IFF_MASTER; 1786 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1787 } 1788 } 1789 1790 return res; 1791 } 1792 1793 /* Try to release the slave device <slave> from the bond device <master> 1794 * It is legal to access curr_active_slave without a lock because all the function 1795 * is RTNL-locked. If "all" is true it means that the function is being called 1796 * while destroying a bond interface and all slaves are being released. 1797 * 1798 * The rules for slave state should be: 1799 * for Active/Backup: 1800 * Active stays on all backups go down 1801 * for Bonded connections: 1802 * The first up interface should be left on and all others downed. 1803 */ 1804 static int __bond_release_one(struct net_device *bond_dev, 1805 struct net_device *slave_dev, 1806 bool all) 1807 { 1808 struct bonding *bond = netdev_priv(bond_dev); 1809 struct slave *slave, *oldcurrent; 1810 struct sockaddr addr; 1811 int old_flags = bond_dev->flags; 1812 netdev_features_t old_features = bond_dev->features; 1813 1814 /* slave is not a slave or master is not master of this slave */ 1815 if (!(slave_dev->flags & IFF_SLAVE) || 1816 !netdev_has_upper_dev(slave_dev, bond_dev)) { 1817 netdev_dbg(bond_dev, "cannot release %s\n", 1818 slave_dev->name); 1819 return -EINVAL; 1820 } 1821 1822 block_netpoll_tx(); 1823 1824 slave = bond_get_slave_by_dev(bond, slave_dev); 1825 if (!slave) { 1826 /* not a slave of this bond */ 1827 netdev_info(bond_dev, "%s not enslaved\n", 1828 slave_dev->name); 1829 unblock_netpoll_tx(); 1830 return -EINVAL; 1831 } 1832 1833 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW); 1834 1835 bond_sysfs_slave_del(slave); 1836 1837 /* recompute stats just before removing the slave */ 1838 bond_get_stats(bond->dev, &bond->bond_stats); 1839 1840 bond_upper_dev_unlink(bond, slave); 1841 /* unregister rx_handler early so bond_handle_frame wouldn't be called 1842 * for this slave anymore. 1843 */ 1844 netdev_rx_handler_unregister(slave_dev); 1845 1846 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1847 bond_3ad_unbind_slave(slave); 1848 1849 if (bond_mode_uses_xmit_hash(bond)) 1850 bond_update_slave_arr(bond, slave); 1851 1852 netdev_info(bond_dev, "Releasing %s interface %s\n", 1853 bond_is_active_slave(slave) ? "active" : "backup", 1854 slave_dev->name); 1855 1856 oldcurrent = rcu_access_pointer(bond->curr_active_slave); 1857 1858 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 1859 1860 if (!all && (!bond->params.fail_over_mac || 1861 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) { 1862 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) && 1863 bond_has_slaves(bond)) 1864 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", 1865 slave_dev->name, slave->perm_hwaddr, 1866 bond_dev->name, slave_dev->name); 1867 } 1868 1869 if (rtnl_dereference(bond->primary_slave) == slave) 1870 RCU_INIT_POINTER(bond->primary_slave, NULL); 1871 1872 if (oldcurrent == slave) 1873 bond_change_active_slave(bond, NULL); 1874 1875 if (bond_is_lb(bond)) { 1876 /* Must be called only after the slave has been 1877 * detached from the list and the curr_active_slave 1878 * has been cleared (if our_slave == old_current), 1879 * but before a new active slave is selected. 1880 */ 1881 bond_alb_deinit_slave(bond, slave); 1882 } 1883 1884 if (all) { 1885 RCU_INIT_POINTER(bond->curr_active_slave, NULL); 1886 } else if (oldcurrent == slave) { 1887 /* Note that we hold RTNL over this sequence, so there 1888 * is no concern that another slave add/remove event 1889 * will interfere. 1890 */ 1891 bond_select_active_slave(bond); 1892 } 1893 1894 if (!bond_has_slaves(bond)) { 1895 bond_set_carrier(bond); 1896 eth_hw_addr_random(bond_dev); 1897 } 1898 1899 unblock_netpoll_tx(); 1900 synchronize_rcu(); 1901 bond->slave_cnt--; 1902 1903 if (!bond_has_slaves(bond)) { 1904 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 1905 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev); 1906 } 1907 1908 bond_compute_features(bond); 1909 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 1910 (old_features & NETIF_F_VLAN_CHALLENGED)) 1911 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n", 1912 slave_dev->name, bond_dev->name); 1913 1914 vlan_vids_del_by_dev(slave_dev, bond_dev); 1915 1916 /* If the mode uses primary, then this case was handled above by 1917 * bond_change_active_slave(..., NULL) 1918 */ 1919 if (!bond_uses_primary(bond)) { 1920 /* unset promiscuity level from slave 1921 * NOTE: The NETDEV_CHANGEADDR call above may change the value 1922 * of the IFF_PROMISC flag in the bond_dev, but we need the 1923 * value of that flag before that change, as that was the value 1924 * when this slave was attached, so we cache at the start of the 1925 * function and use it here. Same goes for ALLMULTI below 1926 */ 1927 if (old_flags & IFF_PROMISC) 1928 dev_set_promiscuity(slave_dev, -1); 1929 1930 /* unset allmulti level from slave */ 1931 if (old_flags & IFF_ALLMULTI) 1932 dev_set_allmulti(slave_dev, -1); 1933 1934 bond_hw_addr_flush(bond_dev, slave_dev); 1935 } 1936 1937 slave_disable_netpoll(slave); 1938 1939 /* close slave before restoring its mac address */ 1940 dev_close(slave_dev); 1941 1942 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE || 1943 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1944 /* restore original ("permanent") mac address */ 1945 ether_addr_copy(addr.sa_data, slave->perm_hwaddr); 1946 addr.sa_family = slave_dev->type; 1947 dev_set_mac_address(slave_dev, &addr); 1948 } 1949 1950 dev_set_mtu(slave_dev, slave->original_mtu); 1951 1952 slave_dev->priv_flags &= ~IFF_BONDING; 1953 1954 bond_free_slave(slave); 1955 1956 return 0; 1957 } 1958 1959 /* A wrapper used because of ndo_del_link */ 1960 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 1961 { 1962 return __bond_release_one(bond_dev, slave_dev, false); 1963 } 1964 1965 /* First release a slave and then destroy the bond if no more slaves are left. 1966 * Must be under rtnl_lock when this function is called. 1967 */ 1968 static int bond_release_and_destroy(struct net_device *bond_dev, 1969 struct net_device *slave_dev) 1970 { 1971 struct bonding *bond = netdev_priv(bond_dev); 1972 int ret; 1973 1974 ret = bond_release(bond_dev, slave_dev); 1975 if (ret == 0 && !bond_has_slaves(bond)) { 1976 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 1977 netdev_info(bond_dev, "Destroying bond %s\n", 1978 bond_dev->name); 1979 bond_remove_proc_entry(bond); 1980 unregister_netdevice(bond_dev); 1981 } 1982 return ret; 1983 } 1984 1985 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info) 1986 { 1987 struct bonding *bond = netdev_priv(bond_dev); 1988 bond_fill_ifbond(bond, info); 1989 return 0; 1990 } 1991 1992 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 1993 { 1994 struct bonding *bond = netdev_priv(bond_dev); 1995 struct list_head *iter; 1996 int i = 0, res = -ENODEV; 1997 struct slave *slave; 1998 1999 bond_for_each_slave(bond, slave, iter) { 2000 if (i++ == (int)info->slave_id) { 2001 res = 0; 2002 bond_fill_ifslave(slave, info); 2003 break; 2004 } 2005 } 2006 2007 return res; 2008 } 2009 2010 /*-------------------------------- Monitoring -------------------------------*/ 2011 2012 /* called with rcu_read_lock() */ 2013 static int bond_miimon_inspect(struct bonding *bond) 2014 { 2015 int link_state, commit = 0; 2016 struct list_head *iter; 2017 struct slave *slave; 2018 bool ignore_updelay; 2019 2020 ignore_updelay = !rcu_dereference(bond->curr_active_slave); 2021 2022 bond_for_each_slave_rcu(bond, slave, iter) { 2023 slave->new_link = BOND_LINK_NOCHANGE; 2024 2025 link_state = bond_check_dev_link(bond, slave->dev, 0); 2026 2027 switch (slave->link) { 2028 case BOND_LINK_UP: 2029 if (link_state) 2030 continue; 2031 2032 bond_set_slave_link_state(slave, BOND_LINK_FAIL, 2033 BOND_SLAVE_NOTIFY_LATER); 2034 slave->delay = bond->params.downdelay; 2035 if (slave->delay) { 2036 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n", 2037 (BOND_MODE(bond) == 2038 BOND_MODE_ACTIVEBACKUP) ? 2039 (bond_is_active_slave(slave) ? 2040 "active " : "backup ") : "", 2041 slave->dev->name, 2042 bond->params.downdelay * bond->params.miimon); 2043 } 2044 /*FALLTHRU*/ 2045 case BOND_LINK_FAIL: 2046 if (link_state) { 2047 /* recovered before downdelay expired */ 2048 bond_set_slave_link_state(slave, BOND_LINK_UP, 2049 BOND_SLAVE_NOTIFY_LATER); 2050 slave->last_link_up = jiffies; 2051 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n", 2052 (bond->params.downdelay - slave->delay) * 2053 bond->params.miimon, 2054 slave->dev->name); 2055 continue; 2056 } 2057 2058 if (slave->delay <= 0) { 2059 slave->new_link = BOND_LINK_DOWN; 2060 commit++; 2061 continue; 2062 } 2063 2064 slave->delay--; 2065 break; 2066 2067 case BOND_LINK_DOWN: 2068 if (!link_state) 2069 continue; 2070 2071 bond_set_slave_link_state(slave, BOND_LINK_BACK, 2072 BOND_SLAVE_NOTIFY_LATER); 2073 slave->delay = bond->params.updelay; 2074 2075 if (slave->delay) { 2076 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n", 2077 slave->dev->name, 2078 ignore_updelay ? 0 : 2079 bond->params.updelay * 2080 bond->params.miimon); 2081 } 2082 /*FALLTHRU*/ 2083 case BOND_LINK_BACK: 2084 if (!link_state) { 2085 bond_set_slave_link_state(slave, 2086 BOND_LINK_DOWN, 2087 BOND_SLAVE_NOTIFY_LATER); 2088 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n", 2089 (bond->params.updelay - slave->delay) * 2090 bond->params.miimon, 2091 slave->dev->name); 2092 2093 continue; 2094 } 2095 2096 if (ignore_updelay) 2097 slave->delay = 0; 2098 2099 if (slave->delay <= 0) { 2100 slave->new_link = BOND_LINK_UP; 2101 commit++; 2102 ignore_updelay = false; 2103 continue; 2104 } 2105 2106 slave->delay--; 2107 break; 2108 } 2109 } 2110 2111 return commit; 2112 } 2113 2114 static void bond_miimon_commit(struct bonding *bond) 2115 { 2116 struct list_head *iter; 2117 struct slave *slave, *primary; 2118 2119 bond_for_each_slave(bond, slave, iter) { 2120 switch (slave->new_link) { 2121 case BOND_LINK_NOCHANGE: 2122 continue; 2123 2124 case BOND_LINK_UP: 2125 bond_update_speed_duplex(slave); 2126 bond_set_slave_link_state(slave, BOND_LINK_UP, 2127 BOND_SLAVE_NOTIFY_NOW); 2128 slave->last_link_up = jiffies; 2129 2130 primary = rtnl_dereference(bond->primary_slave); 2131 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 2132 /* prevent it from being the active one */ 2133 bond_set_backup_slave(slave); 2134 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2135 /* make it immediately active */ 2136 bond_set_active_slave(slave); 2137 } else if (slave != primary) { 2138 /* prevent it from being the active one */ 2139 bond_set_backup_slave(slave); 2140 } 2141 2142 netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n", 2143 slave->dev->name, 2144 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed, 2145 slave->duplex ? "full" : "half"); 2146 2147 /* notify ad that the link status has changed */ 2148 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2149 bond_3ad_handle_link_change(slave, BOND_LINK_UP); 2150 2151 if (bond_is_lb(bond)) 2152 bond_alb_handle_link_change(bond, slave, 2153 BOND_LINK_UP); 2154 2155 if (BOND_MODE(bond) == BOND_MODE_XOR) 2156 bond_update_slave_arr(bond, NULL); 2157 2158 if (!bond->curr_active_slave || slave == primary) 2159 goto do_failover; 2160 2161 continue; 2162 2163 case BOND_LINK_DOWN: 2164 if (slave->link_failure_count < UINT_MAX) 2165 slave->link_failure_count++; 2166 2167 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2168 BOND_SLAVE_NOTIFY_NOW); 2169 2170 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP || 2171 BOND_MODE(bond) == BOND_MODE_8023AD) 2172 bond_set_slave_inactive_flags(slave, 2173 BOND_SLAVE_NOTIFY_NOW); 2174 2175 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n", 2176 slave->dev->name); 2177 2178 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2179 bond_3ad_handle_link_change(slave, 2180 BOND_LINK_DOWN); 2181 2182 if (bond_is_lb(bond)) 2183 bond_alb_handle_link_change(bond, slave, 2184 BOND_LINK_DOWN); 2185 2186 if (BOND_MODE(bond) == BOND_MODE_XOR) 2187 bond_update_slave_arr(bond, NULL); 2188 2189 if (slave == rcu_access_pointer(bond->curr_active_slave)) 2190 goto do_failover; 2191 2192 continue; 2193 2194 default: 2195 netdev_err(bond->dev, "invalid new link %d on slave %s\n", 2196 slave->new_link, slave->dev->name); 2197 slave->new_link = BOND_LINK_NOCHANGE; 2198 2199 continue; 2200 } 2201 2202 do_failover: 2203 block_netpoll_tx(); 2204 bond_select_active_slave(bond); 2205 unblock_netpoll_tx(); 2206 } 2207 2208 bond_set_carrier(bond); 2209 } 2210 2211 /* bond_mii_monitor 2212 * 2213 * Really a wrapper that splits the mii monitor into two phases: an 2214 * inspection, then (if inspection indicates something needs to be done) 2215 * an acquisition of appropriate locks followed by a commit phase to 2216 * implement whatever link state changes are indicated. 2217 */ 2218 static void bond_mii_monitor(struct work_struct *work) 2219 { 2220 struct bonding *bond = container_of(work, struct bonding, 2221 mii_work.work); 2222 bool should_notify_peers = false; 2223 unsigned long delay; 2224 2225 delay = msecs_to_jiffies(bond->params.miimon); 2226 2227 if (!bond_has_slaves(bond)) 2228 goto re_arm; 2229 2230 rcu_read_lock(); 2231 2232 should_notify_peers = bond_should_notify_peers(bond); 2233 2234 if (bond_miimon_inspect(bond)) { 2235 rcu_read_unlock(); 2236 2237 /* Race avoidance with bond_close cancel of workqueue */ 2238 if (!rtnl_trylock()) { 2239 delay = 1; 2240 should_notify_peers = false; 2241 goto re_arm; 2242 } 2243 2244 bond_miimon_commit(bond); 2245 2246 rtnl_unlock(); /* might sleep, hold no other locks */ 2247 } else 2248 rcu_read_unlock(); 2249 2250 re_arm: 2251 if (bond->params.miimon) 2252 queue_delayed_work(bond->wq, &bond->mii_work, delay); 2253 2254 if (should_notify_peers) { 2255 if (!rtnl_trylock()) 2256 return; 2257 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); 2258 rtnl_unlock(); 2259 } 2260 } 2261 2262 static bool bond_has_this_ip(struct bonding *bond, __be32 ip) 2263 { 2264 struct net_device *upper; 2265 struct list_head *iter; 2266 bool ret = false; 2267 2268 if (ip == bond_confirm_addr(bond->dev, 0, ip)) 2269 return true; 2270 2271 rcu_read_lock(); 2272 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) { 2273 if (ip == bond_confirm_addr(upper, 0, ip)) { 2274 ret = true; 2275 break; 2276 } 2277 } 2278 rcu_read_unlock(); 2279 2280 return ret; 2281 } 2282 2283 /* We go to the (large) trouble of VLAN tagging ARP frames because 2284 * switches in VLAN mode (especially if ports are configured as 2285 * "native" to a VLAN) might not pass non-tagged frames. 2286 */ 2287 static void bond_arp_send(struct net_device *slave_dev, int arp_op, 2288 __be32 dest_ip, __be32 src_ip, 2289 struct bond_vlan_tag *tags) 2290 { 2291 struct sk_buff *skb; 2292 struct bond_vlan_tag *outer_tag = tags; 2293 2294 netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n", 2295 arp_op, slave_dev->name, &dest_ip, &src_ip); 2296 2297 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2298 NULL, slave_dev->dev_addr, NULL); 2299 2300 if (!skb) { 2301 net_err_ratelimited("ARP packet allocation failed\n"); 2302 return; 2303 } 2304 2305 if (!tags || tags->vlan_proto == VLAN_N_VID) 2306 goto xmit; 2307 2308 tags++; 2309 2310 /* Go through all the tags backwards and add them to the packet */ 2311 while (tags->vlan_proto != VLAN_N_VID) { 2312 if (!tags->vlan_id) { 2313 tags++; 2314 continue; 2315 } 2316 2317 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n", 2318 ntohs(outer_tag->vlan_proto), tags->vlan_id); 2319 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto, 2320 tags->vlan_id); 2321 if (!skb) { 2322 net_err_ratelimited("failed to insert inner VLAN tag\n"); 2323 return; 2324 } 2325 2326 tags++; 2327 } 2328 /* Set the outer tag */ 2329 if (outer_tag->vlan_id) { 2330 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n", 2331 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id); 2332 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto, 2333 outer_tag->vlan_id); 2334 } 2335 2336 xmit: 2337 arp_xmit(skb); 2338 } 2339 2340 /* Validate the device path between the @start_dev and the @end_dev. 2341 * The path is valid if the @end_dev is reachable through device 2342 * stacking. 2343 * When the path is validated, collect any vlan information in the 2344 * path. 2345 */ 2346 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev, 2347 struct net_device *end_dev, 2348 int level) 2349 { 2350 struct bond_vlan_tag *tags; 2351 struct net_device *upper; 2352 struct list_head *iter; 2353 2354 if (start_dev == end_dev) { 2355 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC); 2356 if (!tags) 2357 return ERR_PTR(-ENOMEM); 2358 tags[level].vlan_proto = VLAN_N_VID; 2359 return tags; 2360 } 2361 2362 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) { 2363 tags = bond_verify_device_path(upper, end_dev, level + 1); 2364 if (IS_ERR_OR_NULL(tags)) { 2365 if (IS_ERR(tags)) 2366 return tags; 2367 continue; 2368 } 2369 if (is_vlan_dev(upper)) { 2370 tags[level].vlan_proto = vlan_dev_vlan_proto(upper); 2371 tags[level].vlan_id = vlan_dev_vlan_id(upper); 2372 } 2373 2374 return tags; 2375 } 2376 2377 return NULL; 2378 } 2379 2380 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2381 { 2382 struct rtable *rt; 2383 struct bond_vlan_tag *tags; 2384 __be32 *targets = bond->params.arp_targets, addr; 2385 int i; 2386 2387 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) { 2388 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]); 2389 tags = NULL; 2390 2391 /* Find out through which dev should the packet go */ 2392 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 2393 RTO_ONLINK, 0); 2394 if (IS_ERR(rt)) { 2395 /* there's no route to target - try to send arp 2396 * probe to generate any traffic (arp_validate=0) 2397 */ 2398 if (bond->params.arp_validate) 2399 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n", 2400 bond->dev->name, 2401 &targets[i]); 2402 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2403 0, tags); 2404 continue; 2405 } 2406 2407 /* bond device itself */ 2408 if (rt->dst.dev == bond->dev) 2409 goto found; 2410 2411 rcu_read_lock(); 2412 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0); 2413 rcu_read_unlock(); 2414 2415 if (!IS_ERR_OR_NULL(tags)) 2416 goto found; 2417 2418 /* Not our device - skip */ 2419 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n", 2420 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL"); 2421 2422 ip_rt_put(rt); 2423 continue; 2424 2425 found: 2426 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0); 2427 ip_rt_put(rt); 2428 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2429 addr, tags); 2430 kfree(tags); 2431 } 2432 } 2433 2434 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 2435 { 2436 int i; 2437 2438 if (!sip || !bond_has_this_ip(bond, tip)) { 2439 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n", 2440 &sip, &tip); 2441 return; 2442 } 2443 2444 i = bond_get_targets_ip(bond->params.arp_targets, sip); 2445 if (i == -1) { 2446 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n", 2447 &sip); 2448 return; 2449 } 2450 slave->last_rx = jiffies; 2451 slave->target_last_arp_rx[i] = jiffies; 2452 } 2453 2454 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, 2455 struct slave *slave) 2456 { 2457 struct arphdr *arp = (struct arphdr *)skb->data; 2458 struct slave *curr_active_slave, *curr_arp_slave; 2459 unsigned char *arp_ptr; 2460 __be32 sip, tip; 2461 int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP); 2462 2463 if (!slave_do_arp_validate(bond, slave)) { 2464 if ((slave_do_arp_validate_only(bond) && is_arp) || 2465 !slave_do_arp_validate_only(bond)) 2466 slave->last_rx = jiffies; 2467 return RX_HANDLER_ANOTHER; 2468 } else if (!is_arp) { 2469 return RX_HANDLER_ANOTHER; 2470 } 2471 2472 alen = arp_hdr_len(bond->dev); 2473 2474 netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n", 2475 skb->dev->name); 2476 2477 if (alen > skb_headlen(skb)) { 2478 arp = kmalloc(alen, GFP_ATOMIC); 2479 if (!arp) 2480 goto out_unlock; 2481 if (skb_copy_bits(skb, 0, arp, alen) < 0) 2482 goto out_unlock; 2483 } 2484 2485 if (arp->ar_hln != bond->dev->addr_len || 2486 skb->pkt_type == PACKET_OTHERHOST || 2487 skb->pkt_type == PACKET_LOOPBACK || 2488 arp->ar_hrd != htons(ARPHRD_ETHER) || 2489 arp->ar_pro != htons(ETH_P_IP) || 2490 arp->ar_pln != 4) 2491 goto out_unlock; 2492 2493 arp_ptr = (unsigned char *)(arp + 1); 2494 arp_ptr += bond->dev->addr_len; 2495 memcpy(&sip, arp_ptr, 4); 2496 arp_ptr += 4 + bond->dev->addr_len; 2497 memcpy(&tip, arp_ptr, 4); 2498 2499 netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n", 2500 slave->dev->name, bond_slave_state(slave), 2501 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 2502 &sip, &tip); 2503 2504 curr_active_slave = rcu_dereference(bond->curr_active_slave); 2505 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 2506 2507 /* We 'trust' the received ARP enough to validate it if: 2508 * 2509 * (a) the slave receiving the ARP is active (which includes the 2510 * current ARP slave, if any), or 2511 * 2512 * (b) the receiving slave isn't active, but there is a currently 2513 * active slave and it received valid arp reply(s) after it became 2514 * the currently active slave, or 2515 * 2516 * (c) there is an ARP slave that sent an ARP during the prior ARP 2517 * interval, and we receive an ARP reply on any slave. We accept 2518 * these because switch FDB update delays may deliver the ARP 2519 * reply to a slave other than the sender of the ARP request. 2520 * 2521 * Note: for (b), backup slaves are receiving the broadcast ARP 2522 * request, not a reply. This request passes from the sending 2523 * slave through the L2 switch(es) to the receiving slave. Since 2524 * this is checking the request, sip/tip are swapped for 2525 * validation. 2526 * 2527 * This is done to avoid endless looping when we can't reach the 2528 * arp_ip_target and fool ourselves with our own arp requests. 2529 */ 2530 if (bond_is_active_slave(slave)) 2531 bond_validate_arp(bond, slave, sip, tip); 2532 else if (curr_active_slave && 2533 time_after(slave_last_rx(bond, curr_active_slave), 2534 curr_active_slave->last_link_up)) 2535 bond_validate_arp(bond, slave, tip, sip); 2536 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) && 2537 bond_time_in_interval(bond, 2538 dev_trans_start(curr_arp_slave->dev), 1)) 2539 bond_validate_arp(bond, slave, sip, tip); 2540 2541 out_unlock: 2542 if (arp != (struct arphdr *)skb->data) 2543 kfree(arp); 2544 return RX_HANDLER_ANOTHER; 2545 } 2546 2547 /* function to verify if we're in the arp_interval timeslice, returns true if 2548 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval + 2549 * arp_interval/2) . the arp_interval/2 is needed for really fast networks. 2550 */ 2551 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 2552 int mod) 2553 { 2554 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2555 2556 return time_in_range(jiffies, 2557 last_act - delta_in_ticks, 2558 last_act + mod * delta_in_ticks + delta_in_ticks/2); 2559 } 2560 2561 /* This function is called regularly to monitor each slave's link 2562 * ensuring that traffic is being sent and received when arp monitoring 2563 * is used in load-balancing mode. if the adapter has been dormant, then an 2564 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 2565 * arp monitoring in active backup mode. 2566 */ 2567 static void bond_loadbalance_arp_mon(struct work_struct *work) 2568 { 2569 struct bonding *bond = container_of(work, struct bonding, 2570 arp_work.work); 2571 struct slave *slave, *oldcurrent; 2572 struct list_head *iter; 2573 int do_failover = 0, slave_state_changed = 0; 2574 2575 if (!bond_has_slaves(bond)) 2576 goto re_arm; 2577 2578 rcu_read_lock(); 2579 2580 oldcurrent = rcu_dereference(bond->curr_active_slave); 2581 /* see if any of the previous devices are up now (i.e. they have 2582 * xmt and rcv traffic). the curr_active_slave does not come into 2583 * the picture unless it is null. also, slave->last_link_up is not 2584 * needed here because we send an arp on each slave and give a slave 2585 * as long as it needs to get the tx/rx within the delta. 2586 * TODO: what about up/down delay in arp mode? it wasn't here before 2587 * so it can wait 2588 */ 2589 bond_for_each_slave_rcu(bond, slave, iter) { 2590 unsigned long trans_start = dev_trans_start(slave->dev); 2591 2592 if (slave->link != BOND_LINK_UP) { 2593 if (bond_time_in_interval(bond, trans_start, 1) && 2594 bond_time_in_interval(bond, slave->last_rx, 1)) { 2595 2596 slave->link = BOND_LINK_UP; 2597 slave_state_changed = 1; 2598 2599 /* primary_slave has no meaning in round-robin 2600 * mode. the window of a slave being up and 2601 * curr_active_slave being null after enslaving 2602 * is closed. 2603 */ 2604 if (!oldcurrent) { 2605 netdev_info(bond->dev, "link status definitely up for interface %s\n", 2606 slave->dev->name); 2607 do_failover = 1; 2608 } else { 2609 netdev_info(bond->dev, "interface %s is now up\n", 2610 slave->dev->name); 2611 } 2612 } 2613 } else { 2614 /* slave->link == BOND_LINK_UP */ 2615 2616 /* not all switches will respond to an arp request 2617 * when the source ip is 0, so don't take the link down 2618 * if we don't know our ip yet 2619 */ 2620 if (!bond_time_in_interval(bond, trans_start, 2) || 2621 !bond_time_in_interval(bond, slave->last_rx, 2)) { 2622 2623 slave->link = BOND_LINK_DOWN; 2624 slave_state_changed = 1; 2625 2626 if (slave->link_failure_count < UINT_MAX) 2627 slave->link_failure_count++; 2628 2629 netdev_info(bond->dev, "interface %s is now down\n", 2630 slave->dev->name); 2631 2632 if (slave == oldcurrent) 2633 do_failover = 1; 2634 } 2635 } 2636 2637 /* note: if switch is in round-robin mode, all links 2638 * must tx arp to ensure all links rx an arp - otherwise 2639 * links may oscillate or not come up at all; if switch is 2640 * in something like xor mode, there is nothing we can 2641 * do - all replies will be rx'ed on same link causing slaves 2642 * to be unstable during low/no traffic periods 2643 */ 2644 if (bond_slave_is_up(slave)) 2645 bond_arp_send_all(bond, slave); 2646 } 2647 2648 rcu_read_unlock(); 2649 2650 if (do_failover || slave_state_changed) { 2651 if (!rtnl_trylock()) 2652 goto re_arm; 2653 2654 if (slave_state_changed) { 2655 bond_slave_state_change(bond); 2656 if (BOND_MODE(bond) == BOND_MODE_XOR) 2657 bond_update_slave_arr(bond, NULL); 2658 } 2659 if (do_failover) { 2660 block_netpoll_tx(); 2661 bond_select_active_slave(bond); 2662 unblock_netpoll_tx(); 2663 } 2664 rtnl_unlock(); 2665 } 2666 2667 re_arm: 2668 if (bond->params.arp_interval) 2669 queue_delayed_work(bond->wq, &bond->arp_work, 2670 msecs_to_jiffies(bond->params.arp_interval)); 2671 } 2672 2673 /* Called to inspect slaves for active-backup mode ARP monitor link state 2674 * changes. Sets new_link in slaves to specify what action should take 2675 * place for the slave. Returns 0 if no changes are found, >0 if changes 2676 * to link states must be committed. 2677 * 2678 * Called with rcu_read_lock held. 2679 */ 2680 static int bond_ab_arp_inspect(struct bonding *bond) 2681 { 2682 unsigned long trans_start, last_rx; 2683 struct list_head *iter; 2684 struct slave *slave; 2685 int commit = 0; 2686 2687 bond_for_each_slave_rcu(bond, slave, iter) { 2688 slave->new_link = BOND_LINK_NOCHANGE; 2689 last_rx = slave_last_rx(bond, slave); 2690 2691 if (slave->link != BOND_LINK_UP) { 2692 if (bond_time_in_interval(bond, last_rx, 1)) { 2693 slave->new_link = BOND_LINK_UP; 2694 commit++; 2695 } 2696 continue; 2697 } 2698 2699 /* Give slaves 2*delta after being enslaved or made 2700 * active. This avoids bouncing, as the last receive 2701 * times need a full ARP monitor cycle to be updated. 2702 */ 2703 if (bond_time_in_interval(bond, slave->last_link_up, 2)) 2704 continue; 2705 2706 /* Backup slave is down if: 2707 * - No current_arp_slave AND 2708 * - more than 3*delta since last receive AND 2709 * - the bond has an IP address 2710 * 2711 * Note: a non-null current_arp_slave indicates 2712 * the curr_active_slave went down and we are 2713 * searching for a new one; under this condition 2714 * we only take the curr_active_slave down - this 2715 * gives each slave a chance to tx/rx traffic 2716 * before being taken out 2717 */ 2718 if (!bond_is_active_slave(slave) && 2719 !rcu_access_pointer(bond->current_arp_slave) && 2720 !bond_time_in_interval(bond, last_rx, 3)) { 2721 slave->new_link = BOND_LINK_DOWN; 2722 commit++; 2723 } 2724 2725 /* Active slave is down if: 2726 * - more than 2*delta since transmitting OR 2727 * - (more than 2*delta since receive AND 2728 * the bond has an IP address) 2729 */ 2730 trans_start = dev_trans_start(slave->dev); 2731 if (bond_is_active_slave(slave) && 2732 (!bond_time_in_interval(bond, trans_start, 2) || 2733 !bond_time_in_interval(bond, last_rx, 2))) { 2734 slave->new_link = BOND_LINK_DOWN; 2735 commit++; 2736 } 2737 } 2738 2739 return commit; 2740 } 2741 2742 /* Called to commit link state changes noted by inspection step of 2743 * active-backup mode ARP monitor. 2744 * 2745 * Called with RTNL hold. 2746 */ 2747 static void bond_ab_arp_commit(struct bonding *bond) 2748 { 2749 unsigned long trans_start; 2750 struct list_head *iter; 2751 struct slave *slave; 2752 2753 bond_for_each_slave(bond, slave, iter) { 2754 switch (slave->new_link) { 2755 case BOND_LINK_NOCHANGE: 2756 continue; 2757 2758 case BOND_LINK_UP: 2759 trans_start = dev_trans_start(slave->dev); 2760 if (rtnl_dereference(bond->curr_active_slave) != slave || 2761 (!rtnl_dereference(bond->curr_active_slave) && 2762 bond_time_in_interval(bond, trans_start, 1))) { 2763 struct slave *current_arp_slave; 2764 2765 current_arp_slave = rtnl_dereference(bond->current_arp_slave); 2766 bond_set_slave_link_state(slave, BOND_LINK_UP, 2767 BOND_SLAVE_NOTIFY_NOW); 2768 if (current_arp_slave) { 2769 bond_set_slave_inactive_flags( 2770 current_arp_slave, 2771 BOND_SLAVE_NOTIFY_NOW); 2772 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2773 } 2774 2775 netdev_info(bond->dev, "link status definitely up for interface %s\n", 2776 slave->dev->name); 2777 2778 if (!rtnl_dereference(bond->curr_active_slave) || 2779 slave == rtnl_dereference(bond->primary_slave)) 2780 goto do_failover; 2781 2782 } 2783 2784 continue; 2785 2786 case BOND_LINK_DOWN: 2787 if (slave->link_failure_count < UINT_MAX) 2788 slave->link_failure_count++; 2789 2790 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2791 BOND_SLAVE_NOTIFY_NOW); 2792 bond_set_slave_inactive_flags(slave, 2793 BOND_SLAVE_NOTIFY_NOW); 2794 2795 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n", 2796 slave->dev->name); 2797 2798 if (slave == rtnl_dereference(bond->curr_active_slave)) { 2799 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2800 goto do_failover; 2801 } 2802 2803 continue; 2804 2805 default: 2806 netdev_err(bond->dev, "impossible: new_link %d on slave %s\n", 2807 slave->new_link, slave->dev->name); 2808 continue; 2809 } 2810 2811 do_failover: 2812 block_netpoll_tx(); 2813 bond_select_active_slave(bond); 2814 unblock_netpoll_tx(); 2815 } 2816 2817 bond_set_carrier(bond); 2818 } 2819 2820 /* Send ARP probes for active-backup mode ARP monitor. 2821 * 2822 * Called with rcu_read_lock held. 2823 */ 2824 static bool bond_ab_arp_probe(struct bonding *bond) 2825 { 2826 struct slave *slave, *before = NULL, *new_slave = NULL, 2827 *curr_arp_slave = rcu_dereference(bond->current_arp_slave), 2828 *curr_active_slave = rcu_dereference(bond->curr_active_slave); 2829 struct list_head *iter; 2830 bool found = false; 2831 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; 2832 2833 if (curr_arp_slave && curr_active_slave) 2834 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n", 2835 curr_arp_slave->dev->name, 2836 curr_active_slave->dev->name); 2837 2838 if (curr_active_slave) { 2839 bond_arp_send_all(bond, curr_active_slave); 2840 return should_notify_rtnl; 2841 } 2842 2843 /* if we don't have a curr_active_slave, search for the next available 2844 * backup slave from the current_arp_slave and make it the candidate 2845 * for becoming the curr_active_slave 2846 */ 2847 2848 if (!curr_arp_slave) { 2849 curr_arp_slave = bond_first_slave_rcu(bond); 2850 if (!curr_arp_slave) 2851 return should_notify_rtnl; 2852 } 2853 2854 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER); 2855 2856 bond_for_each_slave_rcu(bond, slave, iter) { 2857 if (!found && !before && bond_slave_is_up(slave)) 2858 before = slave; 2859 2860 if (found && !new_slave && bond_slave_is_up(slave)) 2861 new_slave = slave; 2862 /* if the link state is up at this point, we 2863 * mark it down - this can happen if we have 2864 * simultaneous link failures and 2865 * reselect_active_interface doesn't make this 2866 * one the current slave so it is still marked 2867 * up when it is actually down 2868 */ 2869 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 2870 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2871 BOND_SLAVE_NOTIFY_LATER); 2872 if (slave->link_failure_count < UINT_MAX) 2873 slave->link_failure_count++; 2874 2875 bond_set_slave_inactive_flags(slave, 2876 BOND_SLAVE_NOTIFY_LATER); 2877 2878 netdev_info(bond->dev, "backup interface %s is now down\n", 2879 slave->dev->name); 2880 } 2881 if (slave == curr_arp_slave) 2882 found = true; 2883 } 2884 2885 if (!new_slave && before) 2886 new_slave = before; 2887 2888 if (!new_slave) 2889 goto check_state; 2890 2891 bond_set_slave_link_state(new_slave, BOND_LINK_BACK, 2892 BOND_SLAVE_NOTIFY_LATER); 2893 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER); 2894 bond_arp_send_all(bond, new_slave); 2895 new_slave->last_link_up = jiffies; 2896 rcu_assign_pointer(bond->current_arp_slave, new_slave); 2897 2898 check_state: 2899 bond_for_each_slave_rcu(bond, slave, iter) { 2900 if (slave->should_notify || slave->should_notify_link) { 2901 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; 2902 break; 2903 } 2904 } 2905 return should_notify_rtnl; 2906 } 2907 2908 static void bond_activebackup_arp_mon(struct work_struct *work) 2909 { 2910 struct bonding *bond = container_of(work, struct bonding, 2911 arp_work.work); 2912 bool should_notify_peers = false; 2913 bool should_notify_rtnl = false; 2914 int delta_in_ticks; 2915 2916 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2917 2918 if (!bond_has_slaves(bond)) 2919 goto re_arm; 2920 2921 rcu_read_lock(); 2922 2923 should_notify_peers = bond_should_notify_peers(bond); 2924 2925 if (bond_ab_arp_inspect(bond)) { 2926 rcu_read_unlock(); 2927 2928 /* Race avoidance with bond_close flush of workqueue */ 2929 if (!rtnl_trylock()) { 2930 delta_in_ticks = 1; 2931 should_notify_peers = false; 2932 goto re_arm; 2933 } 2934 2935 bond_ab_arp_commit(bond); 2936 2937 rtnl_unlock(); 2938 rcu_read_lock(); 2939 } 2940 2941 should_notify_rtnl = bond_ab_arp_probe(bond); 2942 rcu_read_unlock(); 2943 2944 re_arm: 2945 if (bond->params.arp_interval) 2946 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 2947 2948 if (should_notify_peers || should_notify_rtnl) { 2949 if (!rtnl_trylock()) 2950 return; 2951 2952 if (should_notify_peers) 2953 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 2954 bond->dev); 2955 if (should_notify_rtnl) { 2956 bond_slave_state_notify(bond); 2957 bond_slave_link_notify(bond); 2958 } 2959 2960 rtnl_unlock(); 2961 } 2962 } 2963 2964 /*-------------------------- netdev event handling --------------------------*/ 2965 2966 /* Change device name */ 2967 static int bond_event_changename(struct bonding *bond) 2968 { 2969 bond_remove_proc_entry(bond); 2970 bond_create_proc_entry(bond); 2971 2972 bond_debug_reregister(bond); 2973 2974 return NOTIFY_DONE; 2975 } 2976 2977 static int bond_master_netdev_event(unsigned long event, 2978 struct net_device *bond_dev) 2979 { 2980 struct bonding *event_bond = netdev_priv(bond_dev); 2981 2982 switch (event) { 2983 case NETDEV_CHANGENAME: 2984 return bond_event_changename(event_bond); 2985 case NETDEV_UNREGISTER: 2986 bond_remove_proc_entry(event_bond); 2987 break; 2988 case NETDEV_REGISTER: 2989 bond_create_proc_entry(event_bond); 2990 break; 2991 case NETDEV_NOTIFY_PEERS: 2992 if (event_bond->send_peer_notif) 2993 event_bond->send_peer_notif--; 2994 break; 2995 default: 2996 break; 2997 } 2998 2999 return NOTIFY_DONE; 3000 } 3001 3002 static int bond_slave_netdev_event(unsigned long event, 3003 struct net_device *slave_dev) 3004 { 3005 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary; 3006 struct bonding *bond; 3007 struct net_device *bond_dev; 3008 3009 /* A netdev event can be generated while enslaving a device 3010 * before netdev_rx_handler_register is called in which case 3011 * slave will be NULL 3012 */ 3013 if (!slave) 3014 return NOTIFY_DONE; 3015 bond_dev = slave->bond->dev; 3016 bond = slave->bond; 3017 primary = rtnl_dereference(bond->primary_slave); 3018 3019 switch (event) { 3020 case NETDEV_UNREGISTER: 3021 if (bond_dev->type != ARPHRD_ETHER) 3022 bond_release_and_destroy(bond_dev, slave_dev); 3023 else 3024 bond_release(bond_dev, slave_dev); 3025 break; 3026 case NETDEV_UP: 3027 case NETDEV_CHANGE: 3028 bond_update_speed_duplex(slave); 3029 if (BOND_MODE(bond) == BOND_MODE_8023AD) 3030 bond_3ad_adapter_speed_duplex_changed(slave); 3031 /* Fallthrough */ 3032 case NETDEV_DOWN: 3033 /* Refresh slave-array if applicable! 3034 * If the setup does not use miimon or arpmon (mode-specific!), 3035 * then these events will not cause the slave-array to be 3036 * refreshed. This will cause xmit to use a slave that is not 3037 * usable. Avoid such situation by refeshing the array at these 3038 * events. If these (miimon/arpmon) parameters are configured 3039 * then array gets refreshed twice and that should be fine! 3040 */ 3041 if (bond_mode_uses_xmit_hash(bond)) 3042 bond_update_slave_arr(bond, NULL); 3043 break; 3044 case NETDEV_CHANGEMTU: 3045 /* TODO: Should slaves be allowed to 3046 * independently alter their MTU? For 3047 * an active-backup bond, slaves need 3048 * not be the same type of device, so 3049 * MTUs may vary. For other modes, 3050 * slaves arguably should have the 3051 * same MTUs. To do this, we'd need to 3052 * take over the slave's change_mtu 3053 * function for the duration of their 3054 * servitude. 3055 */ 3056 break; 3057 case NETDEV_CHANGENAME: 3058 /* we don't care if we don't have primary set */ 3059 if (!bond_uses_primary(bond) || 3060 !bond->params.primary[0]) 3061 break; 3062 3063 if (slave == primary) { 3064 /* slave's name changed - he's no longer primary */ 3065 RCU_INIT_POINTER(bond->primary_slave, NULL); 3066 } else if (!strcmp(slave_dev->name, bond->params.primary)) { 3067 /* we have a new primary slave */ 3068 rcu_assign_pointer(bond->primary_slave, slave); 3069 } else { /* we didn't change primary - exit */ 3070 break; 3071 } 3072 3073 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n", 3074 primary ? slave_dev->name : "none"); 3075 3076 block_netpoll_tx(); 3077 bond_select_active_slave(bond); 3078 unblock_netpoll_tx(); 3079 break; 3080 case NETDEV_FEAT_CHANGE: 3081 bond_compute_features(bond); 3082 break; 3083 case NETDEV_RESEND_IGMP: 3084 /* Propagate to master device */ 3085 call_netdevice_notifiers(event, slave->bond->dev); 3086 break; 3087 default: 3088 break; 3089 } 3090 3091 return NOTIFY_DONE; 3092 } 3093 3094 /* bond_netdev_event: handle netdev notifier chain events. 3095 * 3096 * This function receives events for the netdev chain. The caller (an 3097 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 3098 * locks for us to safely manipulate the slave devices (RTNL lock, 3099 * dev_probe_lock). 3100 */ 3101 static int bond_netdev_event(struct notifier_block *this, 3102 unsigned long event, void *ptr) 3103 { 3104 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 3105 3106 netdev_dbg(event_dev, "event: %lx\n", event); 3107 3108 if (!(event_dev->priv_flags & IFF_BONDING)) 3109 return NOTIFY_DONE; 3110 3111 if (event_dev->flags & IFF_MASTER) { 3112 netdev_dbg(event_dev, "IFF_MASTER\n"); 3113 return bond_master_netdev_event(event, event_dev); 3114 } 3115 3116 if (event_dev->flags & IFF_SLAVE) { 3117 netdev_dbg(event_dev, "IFF_SLAVE\n"); 3118 return bond_slave_netdev_event(event, event_dev); 3119 } 3120 3121 return NOTIFY_DONE; 3122 } 3123 3124 static struct notifier_block bond_netdev_notifier = { 3125 .notifier_call = bond_netdev_event, 3126 }; 3127 3128 /*---------------------------- Hashing Policies -----------------------------*/ 3129 3130 /* L2 hash helper */ 3131 static inline u32 bond_eth_hash(struct sk_buff *skb) 3132 { 3133 struct ethhdr *ep, hdr_tmp; 3134 3135 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp); 3136 if (ep) 3137 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto; 3138 return 0; 3139 } 3140 3141 /* Extract the appropriate headers based on bond's xmit policy */ 3142 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, 3143 struct flow_keys *fk) 3144 { 3145 const struct ipv6hdr *iph6; 3146 const struct iphdr *iph; 3147 int noff, proto = -1; 3148 3149 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23) 3150 return skb_flow_dissect_flow_keys(skb, fk, 0); 3151 3152 fk->ports.ports = 0; 3153 noff = skb_network_offset(skb); 3154 if (skb->protocol == htons(ETH_P_IP)) { 3155 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph)))) 3156 return false; 3157 iph = ip_hdr(skb); 3158 iph_to_flow_copy_v4addrs(fk, iph); 3159 noff += iph->ihl << 2; 3160 if (!ip_is_fragment(iph)) 3161 proto = iph->protocol; 3162 } else if (skb->protocol == htons(ETH_P_IPV6)) { 3163 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6)))) 3164 return false; 3165 iph6 = ipv6_hdr(skb); 3166 iph_to_flow_copy_v6addrs(fk, iph6); 3167 noff += sizeof(*iph6); 3168 proto = iph6->nexthdr; 3169 } else { 3170 return false; 3171 } 3172 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0) 3173 fk->ports.ports = skb_flow_get_ports(skb, noff, proto); 3174 3175 return true; 3176 } 3177 3178 /** 3179 * bond_xmit_hash - generate a hash value based on the xmit policy 3180 * @bond: bonding device 3181 * @skb: buffer to use for headers 3182 * 3183 * This function will extract the necessary headers from the skb buffer and use 3184 * them to generate a hash based on the xmit_policy set in the bonding device 3185 */ 3186 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb) 3187 { 3188 struct flow_keys flow; 3189 u32 hash; 3190 3191 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 && 3192 skb->l4_hash) 3193 return skb->hash; 3194 3195 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 || 3196 !bond_flow_dissect(bond, skb, &flow)) 3197 return bond_eth_hash(skb); 3198 3199 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 || 3200 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) 3201 hash = bond_eth_hash(skb); 3202 else 3203 hash = (__force u32)flow.ports.ports; 3204 hash ^= (__force u32)flow_get_u32_dst(&flow) ^ 3205 (__force u32)flow_get_u32_src(&flow); 3206 hash ^= (hash >> 16); 3207 hash ^= (hash >> 8); 3208 3209 return hash; 3210 } 3211 3212 /*-------------------------- Device entry points ----------------------------*/ 3213 3214 static void bond_work_init_all(struct bonding *bond) 3215 { 3216 INIT_DELAYED_WORK(&bond->mcast_work, 3217 bond_resend_igmp_join_requests_delayed); 3218 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 3219 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 3220 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3221 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon); 3222 else 3223 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon); 3224 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 3225 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler); 3226 } 3227 3228 static void bond_work_cancel_all(struct bonding *bond) 3229 { 3230 cancel_delayed_work_sync(&bond->mii_work); 3231 cancel_delayed_work_sync(&bond->arp_work); 3232 cancel_delayed_work_sync(&bond->alb_work); 3233 cancel_delayed_work_sync(&bond->ad_work); 3234 cancel_delayed_work_sync(&bond->mcast_work); 3235 cancel_delayed_work_sync(&bond->slave_arr_work); 3236 } 3237 3238 static int bond_open(struct net_device *bond_dev) 3239 { 3240 struct bonding *bond = netdev_priv(bond_dev); 3241 struct list_head *iter; 3242 struct slave *slave; 3243 3244 /* reset slave->backup and slave->inactive */ 3245 if (bond_has_slaves(bond)) { 3246 bond_for_each_slave(bond, slave, iter) { 3247 if (bond_uses_primary(bond) && 3248 slave != rcu_access_pointer(bond->curr_active_slave)) { 3249 bond_set_slave_inactive_flags(slave, 3250 BOND_SLAVE_NOTIFY_NOW); 3251 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) { 3252 bond_set_slave_active_flags(slave, 3253 BOND_SLAVE_NOTIFY_NOW); 3254 } 3255 } 3256 } 3257 3258 bond_work_init_all(bond); 3259 3260 if (bond_is_lb(bond)) { 3261 /* bond_alb_initialize must be called before the timer 3262 * is started. 3263 */ 3264 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB))) 3265 return -ENOMEM; 3266 if (bond->params.tlb_dynamic_lb) 3267 queue_delayed_work(bond->wq, &bond->alb_work, 0); 3268 } 3269 3270 if (bond->params.miimon) /* link check interval, in milliseconds. */ 3271 queue_delayed_work(bond->wq, &bond->mii_work, 0); 3272 3273 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 3274 queue_delayed_work(bond->wq, &bond->arp_work, 0); 3275 bond->recv_probe = bond_arp_rcv; 3276 } 3277 3278 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3279 queue_delayed_work(bond->wq, &bond->ad_work, 0); 3280 /* register to receive LACPDUs */ 3281 bond->recv_probe = bond_3ad_lacpdu_recv; 3282 bond_3ad_initiate_agg_selection(bond, 1); 3283 } 3284 3285 if (bond_mode_uses_xmit_hash(bond)) 3286 bond_update_slave_arr(bond, NULL); 3287 3288 return 0; 3289 } 3290 3291 static int bond_close(struct net_device *bond_dev) 3292 { 3293 struct bonding *bond = netdev_priv(bond_dev); 3294 3295 bond_work_cancel_all(bond); 3296 bond->send_peer_notif = 0; 3297 if (bond_is_lb(bond)) 3298 bond_alb_deinitialize(bond); 3299 bond->recv_probe = NULL; 3300 3301 return 0; 3302 } 3303 3304 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but 3305 * that some drivers can provide 32bit values only. 3306 */ 3307 static void bond_fold_stats(struct rtnl_link_stats64 *_res, 3308 const struct rtnl_link_stats64 *_new, 3309 const struct rtnl_link_stats64 *_old) 3310 { 3311 const u64 *new = (const u64 *)_new; 3312 const u64 *old = (const u64 *)_old; 3313 u64 *res = (u64 *)_res; 3314 int i; 3315 3316 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) { 3317 u64 nv = new[i]; 3318 u64 ov = old[i]; 3319 3320 /* detects if this particular field is 32bit only */ 3321 if (((nv | ov) >> 32) == 0) 3322 res[i] += (u32)nv - (u32)ov; 3323 else 3324 res[i] += nv - ov; 3325 } 3326 } 3327 3328 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev, 3329 struct rtnl_link_stats64 *stats) 3330 { 3331 struct bonding *bond = netdev_priv(bond_dev); 3332 struct rtnl_link_stats64 temp; 3333 struct list_head *iter; 3334 struct slave *slave; 3335 3336 spin_lock(&bond->stats_lock); 3337 memcpy(stats, &bond->bond_stats, sizeof(*stats)); 3338 3339 rcu_read_lock(); 3340 bond_for_each_slave_rcu(bond, slave, iter) { 3341 const struct rtnl_link_stats64 *new = 3342 dev_get_stats(slave->dev, &temp); 3343 3344 bond_fold_stats(stats, new, &slave->slave_stats); 3345 3346 /* save off the slave stats for the next run */ 3347 memcpy(&slave->slave_stats, new, sizeof(*new)); 3348 } 3349 rcu_read_unlock(); 3350 3351 memcpy(&bond->bond_stats, stats, sizeof(*stats)); 3352 spin_unlock(&bond->stats_lock); 3353 3354 return stats; 3355 } 3356 3357 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 3358 { 3359 struct bonding *bond = netdev_priv(bond_dev); 3360 struct net_device *slave_dev = NULL; 3361 struct ifbond k_binfo; 3362 struct ifbond __user *u_binfo = NULL; 3363 struct ifslave k_sinfo; 3364 struct ifslave __user *u_sinfo = NULL; 3365 struct mii_ioctl_data *mii = NULL; 3366 struct bond_opt_value newval; 3367 struct net *net; 3368 int res = 0; 3369 3370 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd); 3371 3372 switch (cmd) { 3373 case SIOCGMIIPHY: 3374 mii = if_mii(ifr); 3375 if (!mii) 3376 return -EINVAL; 3377 3378 mii->phy_id = 0; 3379 /* Fall Through */ 3380 case SIOCGMIIREG: 3381 /* We do this again just in case we were called by SIOCGMIIREG 3382 * instead of SIOCGMIIPHY. 3383 */ 3384 mii = if_mii(ifr); 3385 if (!mii) 3386 return -EINVAL; 3387 3388 if (mii->reg_num == 1) { 3389 mii->val_out = 0; 3390 if (netif_carrier_ok(bond->dev)) 3391 mii->val_out = BMSR_LSTATUS; 3392 } 3393 3394 return 0; 3395 case BOND_INFO_QUERY_OLD: 3396 case SIOCBONDINFOQUERY: 3397 u_binfo = (struct ifbond __user *)ifr->ifr_data; 3398 3399 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 3400 return -EFAULT; 3401 3402 res = bond_info_query(bond_dev, &k_binfo); 3403 if (res == 0 && 3404 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 3405 return -EFAULT; 3406 3407 return res; 3408 case BOND_SLAVE_INFO_QUERY_OLD: 3409 case SIOCBONDSLAVEINFOQUERY: 3410 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 3411 3412 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 3413 return -EFAULT; 3414 3415 res = bond_slave_info_query(bond_dev, &k_sinfo); 3416 if (res == 0 && 3417 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 3418 return -EFAULT; 3419 3420 return res; 3421 default: 3422 break; 3423 } 3424 3425 net = dev_net(bond_dev); 3426 3427 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3428 return -EPERM; 3429 3430 slave_dev = __dev_get_by_name(net, ifr->ifr_slave); 3431 3432 netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev); 3433 3434 if (!slave_dev) 3435 return -ENODEV; 3436 3437 netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name); 3438 switch (cmd) { 3439 case BOND_ENSLAVE_OLD: 3440 case SIOCBONDENSLAVE: 3441 res = bond_enslave(bond_dev, slave_dev); 3442 break; 3443 case BOND_RELEASE_OLD: 3444 case SIOCBONDRELEASE: 3445 res = bond_release(bond_dev, slave_dev); 3446 break; 3447 case BOND_SETHWADDR_OLD: 3448 case SIOCBONDSETHWADDR: 3449 bond_set_dev_addr(bond_dev, slave_dev); 3450 res = 0; 3451 break; 3452 case BOND_CHANGE_ACTIVE_OLD: 3453 case SIOCBONDCHANGEACTIVE: 3454 bond_opt_initstr(&newval, slave_dev->name); 3455 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval); 3456 break; 3457 default: 3458 res = -EOPNOTSUPP; 3459 } 3460 3461 return res; 3462 } 3463 3464 static void bond_change_rx_flags(struct net_device *bond_dev, int change) 3465 { 3466 struct bonding *bond = netdev_priv(bond_dev); 3467 3468 if (change & IFF_PROMISC) 3469 bond_set_promiscuity(bond, 3470 bond_dev->flags & IFF_PROMISC ? 1 : -1); 3471 3472 if (change & IFF_ALLMULTI) 3473 bond_set_allmulti(bond, 3474 bond_dev->flags & IFF_ALLMULTI ? 1 : -1); 3475 } 3476 3477 static void bond_set_rx_mode(struct net_device *bond_dev) 3478 { 3479 struct bonding *bond = netdev_priv(bond_dev); 3480 struct list_head *iter; 3481 struct slave *slave; 3482 3483 rcu_read_lock(); 3484 if (bond_uses_primary(bond)) { 3485 slave = rcu_dereference(bond->curr_active_slave); 3486 if (slave) { 3487 dev_uc_sync(slave->dev, bond_dev); 3488 dev_mc_sync(slave->dev, bond_dev); 3489 } 3490 } else { 3491 bond_for_each_slave_rcu(bond, slave, iter) { 3492 dev_uc_sync_multiple(slave->dev, bond_dev); 3493 dev_mc_sync_multiple(slave->dev, bond_dev); 3494 } 3495 } 3496 rcu_read_unlock(); 3497 } 3498 3499 static int bond_neigh_init(struct neighbour *n) 3500 { 3501 struct bonding *bond = netdev_priv(n->dev); 3502 const struct net_device_ops *slave_ops; 3503 struct neigh_parms parms; 3504 struct slave *slave; 3505 int ret; 3506 3507 slave = bond_first_slave(bond); 3508 if (!slave) 3509 return 0; 3510 slave_ops = slave->dev->netdev_ops; 3511 if (!slave_ops->ndo_neigh_setup) 3512 return 0; 3513 3514 parms.neigh_setup = NULL; 3515 parms.neigh_cleanup = NULL; 3516 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); 3517 if (ret) 3518 return ret; 3519 3520 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called 3521 * after the last slave has been detached. Assumes that all slaves 3522 * utilize the same neigh_cleanup (true at this writing as only user 3523 * is ipoib). 3524 */ 3525 n->parms->neigh_cleanup = parms.neigh_cleanup; 3526 3527 if (!parms.neigh_setup) 3528 return 0; 3529 3530 return parms.neigh_setup(n); 3531 } 3532 3533 /* The bonding ndo_neigh_setup is called at init time beofre any 3534 * slave exists. So we must declare proxy setup function which will 3535 * be used at run time to resolve the actual slave neigh param setup. 3536 * 3537 * It's also called by master devices (such as vlans) to setup their 3538 * underlying devices. In that case - do nothing, we're already set up from 3539 * our init. 3540 */ 3541 static int bond_neigh_setup(struct net_device *dev, 3542 struct neigh_parms *parms) 3543 { 3544 /* modify only our neigh_parms */ 3545 if (parms->dev == dev) 3546 parms->neigh_setup = bond_neigh_init; 3547 3548 return 0; 3549 } 3550 3551 /* Change the MTU of all of a master's slaves to match the master */ 3552 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 3553 { 3554 struct bonding *bond = netdev_priv(bond_dev); 3555 struct slave *slave, *rollback_slave; 3556 struct list_head *iter; 3557 int res = 0; 3558 3559 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu); 3560 3561 bond_for_each_slave(bond, slave, iter) { 3562 netdev_dbg(bond_dev, "s %p c_m %p\n", 3563 slave, slave->dev->netdev_ops->ndo_change_mtu); 3564 3565 res = dev_set_mtu(slave->dev, new_mtu); 3566 3567 if (res) { 3568 /* If we failed to set the slave's mtu to the new value 3569 * we must abort the operation even in ACTIVE_BACKUP 3570 * mode, because if we allow the backup slaves to have 3571 * different mtu values than the active slave we'll 3572 * need to change their mtu when doing a failover. That 3573 * means changing their mtu from timer context, which 3574 * is probably not a good idea. 3575 */ 3576 netdev_dbg(bond_dev, "err %d %s\n", res, 3577 slave->dev->name); 3578 goto unwind; 3579 } 3580 } 3581 3582 bond_dev->mtu = new_mtu; 3583 3584 return 0; 3585 3586 unwind: 3587 /* unwind from head to the slave that failed */ 3588 bond_for_each_slave(bond, rollback_slave, iter) { 3589 int tmp_res; 3590 3591 if (rollback_slave == slave) 3592 break; 3593 3594 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu); 3595 if (tmp_res) { 3596 netdev_dbg(bond_dev, "unwind err %d dev %s\n", 3597 tmp_res, rollback_slave->dev->name); 3598 } 3599 } 3600 3601 return res; 3602 } 3603 3604 /* Change HW address 3605 * 3606 * Note that many devices must be down to change the HW address, and 3607 * downing the master releases all slaves. We can make bonds full of 3608 * bonding devices to test this, however. 3609 */ 3610 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 3611 { 3612 struct bonding *bond = netdev_priv(bond_dev); 3613 struct slave *slave, *rollback_slave; 3614 struct sockaddr *sa = addr, tmp_sa; 3615 struct list_head *iter; 3616 int res = 0; 3617 3618 if (BOND_MODE(bond) == BOND_MODE_ALB) 3619 return bond_alb_set_mac_address(bond_dev, addr); 3620 3621 3622 netdev_dbg(bond_dev, "bond=%p\n", bond); 3623 3624 /* If fail_over_mac is enabled, do nothing and return success. 3625 * Returning an error causes ifenslave to fail. 3626 */ 3627 if (bond->params.fail_over_mac && 3628 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3629 return 0; 3630 3631 if (!is_valid_ether_addr(sa->sa_data)) 3632 return -EADDRNOTAVAIL; 3633 3634 bond_for_each_slave(bond, slave, iter) { 3635 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name); 3636 res = dev_set_mac_address(slave->dev, addr); 3637 if (res) { 3638 /* TODO: consider downing the slave 3639 * and retry ? 3640 * User should expect communications 3641 * breakage anyway until ARP finish 3642 * updating, so... 3643 */ 3644 netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name); 3645 goto unwind; 3646 } 3647 } 3648 3649 /* success */ 3650 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); 3651 return 0; 3652 3653 unwind: 3654 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 3655 tmp_sa.sa_family = bond_dev->type; 3656 3657 /* unwind from head to the slave that failed */ 3658 bond_for_each_slave(bond, rollback_slave, iter) { 3659 int tmp_res; 3660 3661 if (rollback_slave == slave) 3662 break; 3663 3664 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa); 3665 if (tmp_res) { 3666 netdev_dbg(bond_dev, "unwind err %d dev %s\n", 3667 tmp_res, rollback_slave->dev->name); 3668 } 3669 } 3670 3671 return res; 3672 } 3673 3674 /** 3675 * bond_xmit_slave_id - transmit skb through slave with slave_id 3676 * @bond: bonding device that is transmitting 3677 * @skb: buffer to transmit 3678 * @slave_id: slave id up to slave_cnt-1 through which to transmit 3679 * 3680 * This function tries to transmit through slave with slave_id but in case 3681 * it fails, it tries to find the first available slave for transmission. 3682 * The skb is consumed in all cases, thus the function is void. 3683 */ 3684 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id) 3685 { 3686 struct list_head *iter; 3687 struct slave *slave; 3688 int i = slave_id; 3689 3690 /* Here we start from the slave with slave_id */ 3691 bond_for_each_slave_rcu(bond, slave, iter) { 3692 if (--i < 0) { 3693 if (bond_slave_can_tx(slave)) { 3694 bond_dev_queue_xmit(bond, skb, slave->dev); 3695 return; 3696 } 3697 } 3698 } 3699 3700 /* Here we start from the first slave up to slave_id */ 3701 i = slave_id; 3702 bond_for_each_slave_rcu(bond, slave, iter) { 3703 if (--i < 0) 3704 break; 3705 if (bond_slave_can_tx(slave)) { 3706 bond_dev_queue_xmit(bond, skb, slave->dev); 3707 return; 3708 } 3709 } 3710 /* no slave that can tx has been found */ 3711 bond_tx_drop(bond->dev, skb); 3712 } 3713 3714 /** 3715 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave 3716 * @bond: bonding device to use 3717 * 3718 * Based on the value of the bonding device's packets_per_slave parameter 3719 * this function generates a slave id, which is usually used as the next 3720 * slave to transmit through. 3721 */ 3722 static u32 bond_rr_gen_slave_id(struct bonding *bond) 3723 { 3724 u32 slave_id; 3725 struct reciprocal_value reciprocal_packets_per_slave; 3726 int packets_per_slave = bond->params.packets_per_slave; 3727 3728 switch (packets_per_slave) { 3729 case 0: 3730 slave_id = prandom_u32(); 3731 break; 3732 case 1: 3733 slave_id = bond->rr_tx_counter; 3734 break; 3735 default: 3736 reciprocal_packets_per_slave = 3737 bond->params.reciprocal_packets_per_slave; 3738 slave_id = reciprocal_divide(bond->rr_tx_counter, 3739 reciprocal_packets_per_slave); 3740 break; 3741 } 3742 bond->rr_tx_counter++; 3743 3744 return slave_id; 3745 } 3746 3747 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev) 3748 { 3749 struct bonding *bond = netdev_priv(bond_dev); 3750 struct iphdr *iph = ip_hdr(skb); 3751 struct slave *slave; 3752 u32 slave_id; 3753 3754 /* Start with the curr_active_slave that joined the bond as the 3755 * default for sending IGMP traffic. For failover purposes one 3756 * needs to maintain some consistency for the interface that will 3757 * send the join/membership reports. The curr_active_slave found 3758 * will send all of this type of traffic. 3759 */ 3760 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) { 3761 slave = rcu_dereference(bond->curr_active_slave); 3762 if (slave) 3763 bond_dev_queue_xmit(bond, skb, slave->dev); 3764 else 3765 bond_xmit_slave_id(bond, skb, 0); 3766 } else { 3767 int slave_cnt = ACCESS_ONCE(bond->slave_cnt); 3768 3769 if (likely(slave_cnt)) { 3770 slave_id = bond_rr_gen_slave_id(bond); 3771 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt); 3772 } else { 3773 bond_tx_drop(bond_dev, skb); 3774 } 3775 } 3776 3777 return NETDEV_TX_OK; 3778 } 3779 3780 /* In active-backup mode, we know that bond->curr_active_slave is always valid if 3781 * the bond has a usable interface. 3782 */ 3783 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev) 3784 { 3785 struct bonding *bond = netdev_priv(bond_dev); 3786 struct slave *slave; 3787 3788 slave = rcu_dereference(bond->curr_active_slave); 3789 if (slave) 3790 bond_dev_queue_xmit(bond, skb, slave->dev); 3791 else 3792 bond_tx_drop(bond_dev, skb); 3793 3794 return NETDEV_TX_OK; 3795 } 3796 3797 /* Use this to update slave_array when (a) it's not appropriate to update 3798 * slave_array right away (note that update_slave_array() may sleep) 3799 * and / or (b) RTNL is not held. 3800 */ 3801 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay) 3802 { 3803 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay); 3804 } 3805 3806 /* Slave array work handler. Holds only RTNL */ 3807 static void bond_slave_arr_handler(struct work_struct *work) 3808 { 3809 struct bonding *bond = container_of(work, struct bonding, 3810 slave_arr_work.work); 3811 int ret; 3812 3813 if (!rtnl_trylock()) 3814 goto err; 3815 3816 ret = bond_update_slave_arr(bond, NULL); 3817 rtnl_unlock(); 3818 if (ret) { 3819 pr_warn_ratelimited("Failed to update slave array from WT\n"); 3820 goto err; 3821 } 3822 return; 3823 3824 err: 3825 bond_slave_arr_work_rearm(bond, 1); 3826 } 3827 3828 /* Build the usable slaves array in control path for modes that use xmit-hash 3829 * to determine the slave interface - 3830 * (a) BOND_MODE_8023AD 3831 * (b) BOND_MODE_XOR 3832 * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0 3833 * 3834 * The caller is expected to hold RTNL only and NO other lock! 3835 */ 3836 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave) 3837 { 3838 struct slave *slave; 3839 struct list_head *iter; 3840 struct bond_up_slave *new_arr, *old_arr; 3841 int agg_id = 0; 3842 int ret = 0; 3843 3844 #ifdef CONFIG_LOCKDEP 3845 WARN_ON(lockdep_is_held(&bond->mode_lock)); 3846 #endif 3847 3848 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]), 3849 GFP_KERNEL); 3850 if (!new_arr) { 3851 ret = -ENOMEM; 3852 pr_err("Failed to build slave-array.\n"); 3853 goto out; 3854 } 3855 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3856 struct ad_info ad_info; 3857 3858 if (bond_3ad_get_active_agg_info(bond, &ad_info)) { 3859 pr_debug("bond_3ad_get_active_agg_info failed\n"); 3860 kfree_rcu(new_arr, rcu); 3861 /* No active aggragator means it's not safe to use 3862 * the previous array. 3863 */ 3864 old_arr = rtnl_dereference(bond->slave_arr); 3865 if (old_arr) { 3866 RCU_INIT_POINTER(bond->slave_arr, NULL); 3867 kfree_rcu(old_arr, rcu); 3868 } 3869 goto out; 3870 } 3871 agg_id = ad_info.aggregator_id; 3872 } 3873 bond_for_each_slave(bond, slave, iter) { 3874 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3875 struct aggregator *agg; 3876 3877 agg = SLAVE_AD_INFO(slave)->port.aggregator; 3878 if (!agg || agg->aggregator_identifier != agg_id) 3879 continue; 3880 } 3881 if (!bond_slave_can_tx(slave)) 3882 continue; 3883 if (skipslave == slave) 3884 continue; 3885 new_arr->arr[new_arr->count++] = slave; 3886 } 3887 3888 old_arr = rtnl_dereference(bond->slave_arr); 3889 rcu_assign_pointer(bond->slave_arr, new_arr); 3890 if (old_arr) 3891 kfree_rcu(old_arr, rcu); 3892 out: 3893 if (ret != 0 && skipslave) { 3894 int idx; 3895 3896 /* Rare situation where caller has asked to skip a specific 3897 * slave but allocation failed (most likely!). BTW this is 3898 * only possible when the call is initiated from 3899 * __bond_release_one(). In this situation; overwrite the 3900 * skipslave entry in the array with the last entry from the 3901 * array to avoid a situation where the xmit path may choose 3902 * this to-be-skipped slave to send a packet out. 3903 */ 3904 old_arr = rtnl_dereference(bond->slave_arr); 3905 for (idx = 0; idx < old_arr->count; idx++) { 3906 if (skipslave == old_arr->arr[idx]) { 3907 old_arr->arr[idx] = 3908 old_arr->arr[old_arr->count-1]; 3909 old_arr->count--; 3910 break; 3911 } 3912 } 3913 } 3914 return ret; 3915 } 3916 3917 /* Use this Xmit function for 3AD as well as XOR modes. The current 3918 * usable slave array is formed in the control path. The xmit function 3919 * just calculates hash and sends the packet out. 3920 */ 3921 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev) 3922 { 3923 struct bonding *bond = netdev_priv(dev); 3924 struct slave *slave; 3925 struct bond_up_slave *slaves; 3926 unsigned int count; 3927 3928 slaves = rcu_dereference(bond->slave_arr); 3929 count = slaves ? ACCESS_ONCE(slaves->count) : 0; 3930 if (likely(count)) { 3931 slave = slaves->arr[bond_xmit_hash(bond, skb) % count]; 3932 bond_dev_queue_xmit(bond, skb, slave->dev); 3933 } else { 3934 bond_tx_drop(dev, skb); 3935 } 3936 3937 return NETDEV_TX_OK; 3938 } 3939 3940 /* in broadcast mode, we send everything to all usable interfaces. */ 3941 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev) 3942 { 3943 struct bonding *bond = netdev_priv(bond_dev); 3944 struct slave *slave = NULL; 3945 struct list_head *iter; 3946 3947 bond_for_each_slave_rcu(bond, slave, iter) { 3948 if (bond_is_last_slave(bond, slave)) 3949 break; 3950 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 3951 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 3952 3953 if (!skb2) { 3954 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n", 3955 bond_dev->name, __func__); 3956 continue; 3957 } 3958 bond_dev_queue_xmit(bond, skb2, slave->dev); 3959 } 3960 } 3961 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) 3962 bond_dev_queue_xmit(bond, skb, slave->dev); 3963 else 3964 bond_tx_drop(bond_dev, skb); 3965 3966 return NETDEV_TX_OK; 3967 } 3968 3969 /*------------------------- Device initialization ---------------------------*/ 3970 3971 /* Lookup the slave that corresponds to a qid */ 3972 static inline int bond_slave_override(struct bonding *bond, 3973 struct sk_buff *skb) 3974 { 3975 struct slave *slave = NULL; 3976 struct list_head *iter; 3977 3978 if (!skb->queue_mapping) 3979 return 1; 3980 3981 /* Find out if any slaves have the same mapping as this skb. */ 3982 bond_for_each_slave_rcu(bond, slave, iter) { 3983 if (slave->queue_id == skb->queue_mapping) { 3984 if (bond_slave_is_up(slave) && 3985 slave->link == BOND_LINK_UP) { 3986 bond_dev_queue_xmit(bond, skb, slave->dev); 3987 return 0; 3988 } 3989 /* If the slave isn't UP, use default transmit policy. */ 3990 break; 3991 } 3992 } 3993 3994 return 1; 3995 } 3996 3997 3998 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb, 3999 void *accel_priv, select_queue_fallback_t fallback) 4000 { 4001 /* This helper function exists to help dev_pick_tx get the correct 4002 * destination queue. Using a helper function skips a call to 4003 * skb_tx_hash and will put the skbs in the queue we expect on their 4004 * way down to the bonding driver. 4005 */ 4006 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 4007 4008 /* Save the original txq to restore before passing to the driver */ 4009 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping; 4010 4011 if (unlikely(txq >= dev->real_num_tx_queues)) { 4012 do { 4013 txq -= dev->real_num_tx_queues; 4014 } while (txq >= dev->real_num_tx_queues); 4015 } 4016 return txq; 4017 } 4018 4019 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4020 { 4021 struct bonding *bond = netdev_priv(dev); 4022 4023 if (bond_should_override_tx_queue(bond) && 4024 !bond_slave_override(bond, skb)) 4025 return NETDEV_TX_OK; 4026 4027 switch (BOND_MODE(bond)) { 4028 case BOND_MODE_ROUNDROBIN: 4029 return bond_xmit_roundrobin(skb, dev); 4030 case BOND_MODE_ACTIVEBACKUP: 4031 return bond_xmit_activebackup(skb, dev); 4032 case BOND_MODE_8023AD: 4033 case BOND_MODE_XOR: 4034 return bond_3ad_xor_xmit(skb, dev); 4035 case BOND_MODE_BROADCAST: 4036 return bond_xmit_broadcast(skb, dev); 4037 case BOND_MODE_ALB: 4038 return bond_alb_xmit(skb, dev); 4039 case BOND_MODE_TLB: 4040 return bond_tlb_xmit(skb, dev); 4041 default: 4042 /* Should never happen, mode already checked */ 4043 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond)); 4044 WARN_ON_ONCE(1); 4045 bond_tx_drop(dev, skb); 4046 return NETDEV_TX_OK; 4047 } 4048 } 4049 4050 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4051 { 4052 struct bonding *bond = netdev_priv(dev); 4053 netdev_tx_t ret = NETDEV_TX_OK; 4054 4055 /* If we risk deadlock from transmitting this in the 4056 * netpoll path, tell netpoll to queue the frame for later tx 4057 */ 4058 if (unlikely(is_netpoll_tx_blocked(dev))) 4059 return NETDEV_TX_BUSY; 4060 4061 rcu_read_lock(); 4062 if (bond_has_slaves(bond)) 4063 ret = __bond_start_xmit(skb, dev); 4064 else 4065 bond_tx_drop(dev, skb); 4066 rcu_read_unlock(); 4067 4068 return ret; 4069 } 4070 4071 static int bond_ethtool_get_settings(struct net_device *bond_dev, 4072 struct ethtool_cmd *ecmd) 4073 { 4074 struct bonding *bond = netdev_priv(bond_dev); 4075 unsigned long speed = 0; 4076 struct list_head *iter; 4077 struct slave *slave; 4078 4079 ecmd->duplex = DUPLEX_UNKNOWN; 4080 ecmd->port = PORT_OTHER; 4081 4082 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we 4083 * do not need to check mode. Though link speed might not represent 4084 * the true receive or transmit bandwidth (not all modes are symmetric) 4085 * this is an accurate maximum. 4086 */ 4087 bond_for_each_slave(bond, slave, iter) { 4088 if (bond_slave_can_tx(slave)) { 4089 if (slave->speed != SPEED_UNKNOWN) 4090 speed += slave->speed; 4091 if (ecmd->duplex == DUPLEX_UNKNOWN && 4092 slave->duplex != DUPLEX_UNKNOWN) 4093 ecmd->duplex = slave->duplex; 4094 } 4095 } 4096 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN); 4097 4098 return 0; 4099 } 4100 4101 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 4102 struct ethtool_drvinfo *drvinfo) 4103 { 4104 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver)); 4105 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version)); 4106 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d", 4107 BOND_ABI_VERSION); 4108 } 4109 4110 static const struct ethtool_ops bond_ethtool_ops = { 4111 .get_drvinfo = bond_ethtool_get_drvinfo, 4112 .get_settings = bond_ethtool_get_settings, 4113 .get_link = ethtool_op_get_link, 4114 }; 4115 4116 static const struct net_device_ops bond_netdev_ops = { 4117 .ndo_init = bond_init, 4118 .ndo_uninit = bond_uninit, 4119 .ndo_open = bond_open, 4120 .ndo_stop = bond_close, 4121 .ndo_start_xmit = bond_start_xmit, 4122 .ndo_select_queue = bond_select_queue, 4123 .ndo_get_stats64 = bond_get_stats, 4124 .ndo_do_ioctl = bond_do_ioctl, 4125 .ndo_change_rx_flags = bond_change_rx_flags, 4126 .ndo_set_rx_mode = bond_set_rx_mode, 4127 .ndo_change_mtu = bond_change_mtu, 4128 .ndo_set_mac_address = bond_set_mac_address, 4129 .ndo_neigh_setup = bond_neigh_setup, 4130 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 4131 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 4132 #ifdef CONFIG_NET_POLL_CONTROLLER 4133 .ndo_netpoll_setup = bond_netpoll_setup, 4134 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 4135 .ndo_poll_controller = bond_poll_controller, 4136 #endif 4137 .ndo_add_slave = bond_enslave, 4138 .ndo_del_slave = bond_release, 4139 .ndo_fix_features = bond_fix_features, 4140 .ndo_bridge_setlink = switchdev_port_bridge_setlink, 4141 .ndo_bridge_getlink = switchdev_port_bridge_getlink, 4142 .ndo_bridge_dellink = switchdev_port_bridge_dellink, 4143 .ndo_fdb_add = switchdev_port_fdb_add, 4144 .ndo_fdb_del = switchdev_port_fdb_del, 4145 .ndo_fdb_dump = switchdev_port_fdb_dump, 4146 .ndo_features_check = passthru_features_check, 4147 }; 4148 4149 static const struct device_type bond_type = { 4150 .name = "bond", 4151 }; 4152 4153 static void bond_destructor(struct net_device *bond_dev) 4154 { 4155 struct bonding *bond = netdev_priv(bond_dev); 4156 if (bond->wq) 4157 destroy_workqueue(bond->wq); 4158 free_netdev(bond_dev); 4159 } 4160 4161 void bond_setup(struct net_device *bond_dev) 4162 { 4163 struct bonding *bond = netdev_priv(bond_dev); 4164 4165 spin_lock_init(&bond->mode_lock); 4166 spin_lock_init(&bond->stats_lock); 4167 bond->params = bonding_defaults; 4168 4169 /* Initialize pointers */ 4170 bond->dev = bond_dev; 4171 4172 /* Initialize the device entry points */ 4173 ether_setup(bond_dev); 4174 bond_dev->netdev_ops = &bond_netdev_ops; 4175 bond_dev->ethtool_ops = &bond_ethtool_ops; 4176 4177 bond_dev->destructor = bond_destructor; 4178 4179 SET_NETDEV_DEVTYPE(bond_dev, &bond_type); 4180 4181 /* Initialize the device options */ 4182 bond_dev->flags |= IFF_MASTER; 4183 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE; 4184 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 4185 4186 /* don't acquire bond device's netif_tx_lock when transmitting */ 4187 bond_dev->features |= NETIF_F_LLTX; 4188 4189 /* By default, we declare the bond to be fully 4190 * VLAN hardware accelerated capable. Special 4191 * care is taken in the various xmit functions 4192 * when there are slaves that are not hw accel 4193 * capable 4194 */ 4195 4196 /* Don't allow bond devices to change network namespaces. */ 4197 bond_dev->features |= NETIF_F_NETNS_LOCAL; 4198 4199 bond_dev->hw_features = BOND_VLAN_FEATURES | 4200 NETIF_F_HW_VLAN_CTAG_TX | 4201 NETIF_F_HW_VLAN_CTAG_RX | 4202 NETIF_F_HW_VLAN_CTAG_FILTER; 4203 4204 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL; 4205 bond_dev->features |= bond_dev->hw_features; 4206 } 4207 4208 /* Destroy a bonding device. 4209 * Must be under rtnl_lock when this function is called. 4210 */ 4211 static void bond_uninit(struct net_device *bond_dev) 4212 { 4213 struct bonding *bond = netdev_priv(bond_dev); 4214 struct list_head *iter; 4215 struct slave *slave; 4216 struct bond_up_slave *arr; 4217 4218 bond_netpoll_cleanup(bond_dev); 4219 4220 /* Release the bonded slaves */ 4221 bond_for_each_slave(bond, slave, iter) 4222 __bond_release_one(bond_dev, slave->dev, true); 4223 netdev_info(bond_dev, "Released all slaves\n"); 4224 4225 arr = rtnl_dereference(bond->slave_arr); 4226 if (arr) { 4227 RCU_INIT_POINTER(bond->slave_arr, NULL); 4228 kfree_rcu(arr, rcu); 4229 } 4230 4231 list_del(&bond->bond_list); 4232 4233 bond_debug_unregister(bond); 4234 } 4235 4236 /*------------------------- Module initialization ---------------------------*/ 4237 4238 static int bond_check_params(struct bond_params *params) 4239 { 4240 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i; 4241 struct bond_opt_value newval; 4242 const struct bond_opt_value *valptr; 4243 int arp_all_targets_value; 4244 u16 ad_actor_sys_prio = 0; 4245 u16 ad_user_port_key = 0; 4246 4247 /* Convert string parameters. */ 4248 if (mode) { 4249 bond_opt_initstr(&newval, mode); 4250 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval); 4251 if (!valptr) { 4252 pr_err("Error: Invalid bonding mode \"%s\"\n", mode); 4253 return -EINVAL; 4254 } 4255 bond_mode = valptr->value; 4256 } 4257 4258 if (xmit_hash_policy) { 4259 if ((bond_mode != BOND_MODE_XOR) && 4260 (bond_mode != BOND_MODE_8023AD) && 4261 (bond_mode != BOND_MODE_TLB)) { 4262 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 4263 bond_mode_name(bond_mode)); 4264 } else { 4265 bond_opt_initstr(&newval, xmit_hash_policy); 4266 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH), 4267 &newval); 4268 if (!valptr) { 4269 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 4270 xmit_hash_policy); 4271 return -EINVAL; 4272 } 4273 xmit_hashtype = valptr->value; 4274 } 4275 } 4276 4277 if (lacp_rate) { 4278 if (bond_mode != BOND_MODE_8023AD) { 4279 pr_info("lacp_rate param is irrelevant in mode %s\n", 4280 bond_mode_name(bond_mode)); 4281 } else { 4282 bond_opt_initstr(&newval, lacp_rate); 4283 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE), 4284 &newval); 4285 if (!valptr) { 4286 pr_err("Error: Invalid lacp rate \"%s\"\n", 4287 lacp_rate); 4288 return -EINVAL; 4289 } 4290 lacp_fast = valptr->value; 4291 } 4292 } 4293 4294 if (ad_select) { 4295 bond_opt_initstr(&newval, ad_select); 4296 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT), 4297 &newval); 4298 if (!valptr) { 4299 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select); 4300 return -EINVAL; 4301 } 4302 params->ad_select = valptr->value; 4303 if (bond_mode != BOND_MODE_8023AD) 4304 pr_warn("ad_select param only affects 802.3ad mode\n"); 4305 } else { 4306 params->ad_select = BOND_AD_STABLE; 4307 } 4308 4309 if (max_bonds < 0) { 4310 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 4311 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 4312 max_bonds = BOND_DEFAULT_MAX_BONDS; 4313 } 4314 4315 if (miimon < 0) { 4316 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4317 miimon, INT_MAX); 4318 miimon = 0; 4319 } 4320 4321 if (updelay < 0) { 4322 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4323 updelay, INT_MAX); 4324 updelay = 0; 4325 } 4326 4327 if (downdelay < 0) { 4328 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4329 downdelay, INT_MAX); 4330 downdelay = 0; 4331 } 4332 4333 if ((use_carrier != 0) && (use_carrier != 1)) { 4334 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 4335 use_carrier); 4336 use_carrier = 1; 4337 } 4338 4339 if (num_peer_notif < 0 || num_peer_notif > 255) { 4340 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 4341 num_peer_notif); 4342 num_peer_notif = 1; 4343 } 4344 4345 /* reset values for 802.3ad/TLB/ALB */ 4346 if (!bond_mode_uses_arp(bond_mode)) { 4347 if (!miimon) { 4348 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"); 4349 pr_warn("Forcing miimon to 100msec\n"); 4350 miimon = BOND_DEFAULT_MIIMON; 4351 } 4352 } 4353 4354 if (tx_queues < 1 || tx_queues > 255) { 4355 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n", 4356 tx_queues, BOND_DEFAULT_TX_QUEUES); 4357 tx_queues = BOND_DEFAULT_TX_QUEUES; 4358 } 4359 4360 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 4361 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n", 4362 all_slaves_active); 4363 all_slaves_active = 0; 4364 } 4365 4366 if (resend_igmp < 0 || resend_igmp > 255) { 4367 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n", 4368 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 4369 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 4370 } 4371 4372 bond_opt_initval(&newval, packets_per_slave); 4373 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) { 4374 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n", 4375 packets_per_slave, USHRT_MAX); 4376 packets_per_slave = 1; 4377 } 4378 4379 if (bond_mode == BOND_MODE_ALB) { 4380 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", 4381 updelay); 4382 } 4383 4384 if (!miimon) { 4385 if (updelay || downdelay) { 4386 /* just warn the user the up/down delay will have 4387 * no effect since miimon is zero... 4388 */ 4389 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", 4390 updelay, downdelay); 4391 } 4392 } else { 4393 /* don't allow arp monitoring */ 4394 if (arp_interval) { 4395 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 4396 miimon, arp_interval); 4397 arp_interval = 0; 4398 } 4399 4400 if ((updelay % miimon) != 0) { 4401 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 4402 updelay, miimon, (updelay / miimon) * miimon); 4403 } 4404 4405 updelay /= miimon; 4406 4407 if ((downdelay % miimon) != 0) { 4408 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 4409 downdelay, miimon, 4410 (downdelay / miimon) * miimon); 4411 } 4412 4413 downdelay /= miimon; 4414 } 4415 4416 if (arp_interval < 0) { 4417 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4418 arp_interval, INT_MAX); 4419 arp_interval = 0; 4420 } 4421 4422 for (arp_ip_count = 0, i = 0; 4423 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) { 4424 __be32 ip; 4425 4426 /* not a complete check, but good enough to catch mistakes */ 4427 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) || 4428 !bond_is_ip_target_ok(ip)) { 4429 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 4430 arp_ip_target[i]); 4431 arp_interval = 0; 4432 } else { 4433 if (bond_get_targets_ip(arp_target, ip) == -1) 4434 arp_target[arp_ip_count++] = ip; 4435 else 4436 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n", 4437 &ip); 4438 } 4439 } 4440 4441 if (arp_interval && !arp_ip_count) { 4442 /* don't allow arping if no arp_ip_target given... */ 4443 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 4444 arp_interval); 4445 arp_interval = 0; 4446 } 4447 4448 if (arp_validate) { 4449 if (!arp_interval) { 4450 pr_err("arp_validate requires arp_interval\n"); 4451 return -EINVAL; 4452 } 4453 4454 bond_opt_initstr(&newval, arp_validate); 4455 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE), 4456 &newval); 4457 if (!valptr) { 4458 pr_err("Error: invalid arp_validate \"%s\"\n", 4459 arp_validate); 4460 return -EINVAL; 4461 } 4462 arp_validate_value = valptr->value; 4463 } else { 4464 arp_validate_value = 0; 4465 } 4466 4467 arp_all_targets_value = 0; 4468 if (arp_all_targets) { 4469 bond_opt_initstr(&newval, arp_all_targets); 4470 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS), 4471 &newval); 4472 if (!valptr) { 4473 pr_err("Error: invalid arp_all_targets_value \"%s\"\n", 4474 arp_all_targets); 4475 arp_all_targets_value = 0; 4476 } else { 4477 arp_all_targets_value = valptr->value; 4478 } 4479 } 4480 4481 if (miimon) { 4482 pr_info("MII link monitoring set to %d ms\n", miimon); 4483 } else if (arp_interval) { 4484 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE, 4485 arp_validate_value); 4486 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 4487 arp_interval, valptr->string, arp_ip_count); 4488 4489 for (i = 0; i < arp_ip_count; i++) 4490 pr_cont(" %s", arp_ip_target[i]); 4491 4492 pr_cont("\n"); 4493 4494 } else if (max_bonds) { 4495 /* miimon and arp_interval not set, we need one so things 4496 * work as expected, see bonding.txt for details 4497 */ 4498 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"); 4499 } 4500 4501 if (primary && !bond_mode_uses_primary(bond_mode)) { 4502 /* currently, using a primary only makes sense 4503 * in active backup, TLB or ALB modes 4504 */ 4505 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n", 4506 primary, bond_mode_name(bond_mode)); 4507 primary = NULL; 4508 } 4509 4510 if (primary && primary_reselect) { 4511 bond_opt_initstr(&newval, primary_reselect); 4512 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT), 4513 &newval); 4514 if (!valptr) { 4515 pr_err("Error: Invalid primary_reselect \"%s\"\n", 4516 primary_reselect); 4517 return -EINVAL; 4518 } 4519 primary_reselect_value = valptr->value; 4520 } else { 4521 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 4522 } 4523 4524 if (fail_over_mac) { 4525 bond_opt_initstr(&newval, fail_over_mac); 4526 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC), 4527 &newval); 4528 if (!valptr) { 4529 pr_err("Error: invalid fail_over_mac \"%s\"\n", 4530 fail_over_mac); 4531 return -EINVAL; 4532 } 4533 fail_over_mac_value = valptr->value; 4534 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 4535 pr_warn("Warning: fail_over_mac only affects active-backup mode\n"); 4536 } else { 4537 fail_over_mac_value = BOND_FOM_NONE; 4538 } 4539 4540 bond_opt_initstr(&newval, "default"); 4541 valptr = bond_opt_parse( 4542 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO), 4543 &newval); 4544 if (!valptr) { 4545 pr_err("Error: No ad_actor_sys_prio default value"); 4546 return -EINVAL; 4547 } 4548 ad_actor_sys_prio = valptr->value; 4549 4550 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY), 4551 &newval); 4552 if (!valptr) { 4553 pr_err("Error: No ad_user_port_key default value"); 4554 return -EINVAL; 4555 } 4556 ad_user_port_key = valptr->value; 4557 4558 if (lp_interval == 0) { 4559 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n", 4560 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL); 4561 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 4562 } 4563 4564 /* fill params struct with the proper values */ 4565 params->mode = bond_mode; 4566 params->xmit_policy = xmit_hashtype; 4567 params->miimon = miimon; 4568 params->num_peer_notif = num_peer_notif; 4569 params->arp_interval = arp_interval; 4570 params->arp_validate = arp_validate_value; 4571 params->arp_all_targets = arp_all_targets_value; 4572 params->updelay = updelay; 4573 params->downdelay = downdelay; 4574 params->use_carrier = use_carrier; 4575 params->lacp_fast = lacp_fast; 4576 params->primary[0] = 0; 4577 params->primary_reselect = primary_reselect_value; 4578 params->fail_over_mac = fail_over_mac_value; 4579 params->tx_queues = tx_queues; 4580 params->all_slaves_active = all_slaves_active; 4581 params->resend_igmp = resend_igmp; 4582 params->min_links = min_links; 4583 params->lp_interval = lp_interval; 4584 params->packets_per_slave = packets_per_slave; 4585 params->tlb_dynamic_lb = 1; /* Default value */ 4586 params->ad_actor_sys_prio = ad_actor_sys_prio; 4587 eth_zero_addr(params->ad_actor_system); 4588 params->ad_user_port_key = ad_user_port_key; 4589 if (packets_per_slave > 0) { 4590 params->reciprocal_packets_per_slave = 4591 reciprocal_value(packets_per_slave); 4592 } else { 4593 /* reciprocal_packets_per_slave is unused if 4594 * packets_per_slave is 0 or 1, just initialize it 4595 */ 4596 params->reciprocal_packets_per_slave = 4597 (struct reciprocal_value) { 0 }; 4598 } 4599 4600 if (primary) { 4601 strncpy(params->primary, primary, IFNAMSIZ); 4602 params->primary[IFNAMSIZ - 1] = 0; 4603 } 4604 4605 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 4606 4607 return 0; 4608 } 4609 4610 static struct lock_class_key bonding_netdev_xmit_lock_key; 4611 static struct lock_class_key bonding_netdev_addr_lock_key; 4612 static struct lock_class_key bonding_tx_busylock_key; 4613 4614 static void bond_set_lockdep_class_one(struct net_device *dev, 4615 struct netdev_queue *txq, 4616 void *_unused) 4617 { 4618 lockdep_set_class(&txq->_xmit_lock, 4619 &bonding_netdev_xmit_lock_key); 4620 } 4621 4622 static void bond_set_lockdep_class(struct net_device *dev) 4623 { 4624 lockdep_set_class(&dev->addr_list_lock, 4625 &bonding_netdev_addr_lock_key); 4626 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL); 4627 dev->qdisc_tx_busylock = &bonding_tx_busylock_key; 4628 } 4629 4630 /* Called from registration process */ 4631 static int bond_init(struct net_device *bond_dev) 4632 { 4633 struct bonding *bond = netdev_priv(bond_dev); 4634 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 4635 4636 netdev_dbg(bond_dev, "Begin bond_init\n"); 4637 4638 bond->wq = create_singlethread_workqueue(bond_dev->name); 4639 if (!bond->wq) 4640 return -ENOMEM; 4641 4642 bond_set_lockdep_class(bond_dev); 4643 4644 list_add_tail(&bond->bond_list, &bn->dev_list); 4645 4646 bond_prepare_sysfs_group(bond); 4647 4648 bond_debug_register(bond); 4649 4650 /* Ensure valid dev_addr */ 4651 if (is_zero_ether_addr(bond_dev->dev_addr) && 4652 bond_dev->addr_assign_type == NET_ADDR_PERM) 4653 eth_hw_addr_random(bond_dev); 4654 4655 return 0; 4656 } 4657 4658 unsigned int bond_get_num_tx_queues(void) 4659 { 4660 return tx_queues; 4661 } 4662 4663 /* Create a new bond based on the specified name and bonding parameters. 4664 * If name is NULL, obtain a suitable "bond%d" name for us. 4665 * Caller must NOT hold rtnl_lock; we need to release it here before we 4666 * set up our sysfs entries. 4667 */ 4668 int bond_create(struct net *net, const char *name) 4669 { 4670 struct net_device *bond_dev; 4671 struct bonding *bond; 4672 struct alb_bond_info *bond_info; 4673 int res; 4674 4675 rtnl_lock(); 4676 4677 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 4678 name ? name : "bond%d", NET_NAME_UNKNOWN, 4679 bond_setup, tx_queues); 4680 if (!bond_dev) { 4681 pr_err("%s: eek! can't alloc netdev!\n", name); 4682 rtnl_unlock(); 4683 return -ENOMEM; 4684 } 4685 4686 /* 4687 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX. 4688 * It is set to 0 by default which is wrong. 4689 */ 4690 bond = netdev_priv(bond_dev); 4691 bond_info = &(BOND_ALB_INFO(bond)); 4692 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; 4693 4694 dev_net_set(bond_dev, net); 4695 bond_dev->rtnl_link_ops = &bond_link_ops; 4696 4697 res = register_netdevice(bond_dev); 4698 4699 netif_carrier_off(bond_dev); 4700 4701 rtnl_unlock(); 4702 if (res < 0) 4703 bond_destructor(bond_dev); 4704 return res; 4705 } 4706 4707 static int __net_init bond_net_init(struct net *net) 4708 { 4709 struct bond_net *bn = net_generic(net, bond_net_id); 4710 4711 bn->net = net; 4712 INIT_LIST_HEAD(&bn->dev_list); 4713 4714 bond_create_proc_dir(bn); 4715 bond_create_sysfs(bn); 4716 4717 return 0; 4718 } 4719 4720 static void __net_exit bond_net_exit(struct net *net) 4721 { 4722 struct bond_net *bn = net_generic(net, bond_net_id); 4723 struct bonding *bond, *tmp_bond; 4724 LIST_HEAD(list); 4725 4726 bond_destroy_sysfs(bn); 4727 4728 /* Kill off any bonds created after unregistering bond rtnl ops */ 4729 rtnl_lock(); 4730 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list) 4731 unregister_netdevice_queue(bond->dev, &list); 4732 unregister_netdevice_many(&list); 4733 rtnl_unlock(); 4734 4735 bond_destroy_proc_dir(bn); 4736 } 4737 4738 static struct pernet_operations bond_net_ops = { 4739 .init = bond_net_init, 4740 .exit = bond_net_exit, 4741 .id = &bond_net_id, 4742 .size = sizeof(struct bond_net), 4743 }; 4744 4745 static int __init bonding_init(void) 4746 { 4747 int i; 4748 int res; 4749 4750 pr_info("%s", bond_version); 4751 4752 res = bond_check_params(&bonding_defaults); 4753 if (res) 4754 goto out; 4755 4756 res = register_pernet_subsys(&bond_net_ops); 4757 if (res) 4758 goto out; 4759 4760 res = bond_netlink_init(); 4761 if (res) 4762 goto err_link; 4763 4764 bond_create_debugfs(); 4765 4766 for (i = 0; i < max_bonds; i++) { 4767 res = bond_create(&init_net, NULL); 4768 if (res) 4769 goto err; 4770 } 4771 4772 register_netdevice_notifier(&bond_netdev_notifier); 4773 out: 4774 return res; 4775 err: 4776 bond_destroy_debugfs(); 4777 bond_netlink_fini(); 4778 err_link: 4779 unregister_pernet_subsys(&bond_net_ops); 4780 goto out; 4781 4782 } 4783 4784 static void __exit bonding_exit(void) 4785 { 4786 unregister_netdevice_notifier(&bond_netdev_notifier); 4787 4788 bond_destroy_debugfs(); 4789 4790 bond_netlink_fini(); 4791 unregister_pernet_subsys(&bond_net_ops); 4792 4793 #ifdef CONFIG_NET_POLL_CONTROLLER 4794 /* Make sure we don't have an imbalance on our netpoll blocking */ 4795 WARN_ON(atomic_read(&netpoll_block_tx)); 4796 #endif 4797 } 4798 4799 module_init(bonding_init); 4800 module_exit(bonding_exit); 4801 MODULE_LICENSE("GPL"); 4802 MODULE_VERSION(DRV_VERSION); 4803 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION); 4804 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 4805