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, "802.3ad 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 unsigned int bond_net_id __read_mostly; 203 204 /*-------------------------- Forward declarations ---------------------------*/ 205 206 static int bond_init(struct net_device *bond_dev); 207 static void bond_uninit(struct net_device *bond_dev); 208 static void bond_get_stats(struct net_device *bond_dev, 209 struct rtnl_link_stats64 *stats); 210 static void bond_slave_arr_handler(struct work_struct *work); 211 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 212 int mod); 213 214 /*---------------------------- General routines -----------------------------*/ 215 216 const char *bond_mode_name(int mode) 217 { 218 static const char *names[] = { 219 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)", 220 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)", 221 [BOND_MODE_XOR] = "load balancing (xor)", 222 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)", 223 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation", 224 [BOND_MODE_TLB] = "transmit load balancing", 225 [BOND_MODE_ALB] = "adaptive load balancing", 226 }; 227 228 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB) 229 return "unknown"; 230 231 return names[mode]; 232 } 233 234 /*---------------------------------- VLAN -----------------------------------*/ 235 236 /** 237 * bond_dev_queue_xmit - Prepare skb for xmit. 238 * 239 * @bond: bond device that got this skb for tx. 240 * @skb: hw accel VLAN tagged skb to transmit 241 * @slave_dev: slave that is supposed to xmit this skbuff 242 */ 243 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, 244 struct net_device *slave_dev) 245 { 246 skb->dev = slave_dev; 247 248 BUILD_BUG_ON(sizeof(skb->queue_mapping) != 249 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping)); 250 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping; 251 252 if (unlikely(netpoll_tx_running(bond->dev))) 253 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb); 254 else 255 dev_queue_xmit(skb); 256 } 257 258 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid, 259 * We don't protect the slave list iteration with a lock because: 260 * a. This operation is performed in IOCTL context, 261 * b. The operation is protected by the RTNL semaphore in the 8021q code, 262 * c. Holding a lock with BH disabled while directly calling a base driver 263 * entry point is generally a BAD idea. 264 * 265 * The design of synchronization/protection for this operation in the 8021q 266 * module is good for one or more VLAN devices over a single physical device 267 * and cannot be extended for a teaming solution like bonding, so there is a 268 * potential race condition here where a net device from the vlan group might 269 * be referenced (either by a base driver or the 8021q code) while it is being 270 * removed from the system. However, it turns out we're not making matters 271 * worse, and if it works for regular VLAN usage it will work here too. 272 */ 273 274 /** 275 * bond_vlan_rx_add_vid - Propagates adding an id to slaves 276 * @bond_dev: bonding net device that got called 277 * @vid: vlan id being added 278 */ 279 static int bond_vlan_rx_add_vid(struct net_device *bond_dev, 280 __be16 proto, u16 vid) 281 { 282 struct bonding *bond = netdev_priv(bond_dev); 283 struct slave *slave, *rollback_slave; 284 struct list_head *iter; 285 int res; 286 287 bond_for_each_slave(bond, slave, iter) { 288 res = vlan_vid_add(slave->dev, proto, vid); 289 if (res) 290 goto unwind; 291 } 292 293 return 0; 294 295 unwind: 296 /* unwind to the slave that failed */ 297 bond_for_each_slave(bond, rollback_slave, iter) { 298 if (rollback_slave == slave) 299 break; 300 301 vlan_vid_del(rollback_slave->dev, proto, vid); 302 } 303 304 return res; 305 } 306 307 /** 308 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves 309 * @bond_dev: bonding net device that got called 310 * @vid: vlan id being removed 311 */ 312 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, 313 __be16 proto, u16 vid) 314 { 315 struct bonding *bond = netdev_priv(bond_dev); 316 struct list_head *iter; 317 struct slave *slave; 318 319 bond_for_each_slave(bond, slave, iter) 320 vlan_vid_del(slave->dev, proto, vid); 321 322 if (bond_is_lb(bond)) 323 bond_alb_clear_vlan(bond, vid); 324 325 return 0; 326 } 327 328 /*------------------------------- Link status -------------------------------*/ 329 330 /* Set the carrier state for the master according to the state of its 331 * slaves. If any slaves are up, the master is up. In 802.3ad mode, 332 * do special 802.3ad magic. 333 * 334 * Returns zero if carrier state does not change, nonzero if it does. 335 */ 336 int bond_set_carrier(struct bonding *bond) 337 { 338 struct list_head *iter; 339 struct slave *slave; 340 341 if (!bond_has_slaves(bond)) 342 goto down; 343 344 if (BOND_MODE(bond) == BOND_MODE_8023AD) 345 return bond_3ad_set_carrier(bond); 346 347 bond_for_each_slave(bond, slave, iter) { 348 if (slave->link == BOND_LINK_UP) { 349 if (!netif_carrier_ok(bond->dev)) { 350 netif_carrier_on(bond->dev); 351 return 1; 352 } 353 return 0; 354 } 355 } 356 357 down: 358 if (netif_carrier_ok(bond->dev)) { 359 netif_carrier_off(bond->dev); 360 return 1; 361 } 362 return 0; 363 } 364 365 /* Get link speed and duplex from the slave's base driver 366 * using ethtool. If for some reason the call fails or the 367 * values are invalid, set speed and duplex to -1, 368 * and return. Return 1 if speed or duplex settings are 369 * UNKNOWN; 0 otherwise. 370 */ 371 static int bond_update_speed_duplex(struct slave *slave) 372 { 373 struct net_device *slave_dev = slave->dev; 374 struct ethtool_link_ksettings ecmd; 375 int res; 376 377 slave->speed = SPEED_UNKNOWN; 378 slave->duplex = DUPLEX_UNKNOWN; 379 380 res = __ethtool_get_link_ksettings(slave_dev, &ecmd); 381 if (res < 0) 382 return 1; 383 if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1)) 384 return 1; 385 switch (ecmd.base.duplex) { 386 case DUPLEX_FULL: 387 case DUPLEX_HALF: 388 break; 389 default: 390 return 1; 391 } 392 393 slave->speed = ecmd.base.speed; 394 slave->duplex = ecmd.base.duplex; 395 396 return 0; 397 } 398 399 const char *bond_slave_link_status(s8 link) 400 { 401 switch (link) { 402 case BOND_LINK_UP: 403 return "up"; 404 case BOND_LINK_FAIL: 405 return "going down"; 406 case BOND_LINK_DOWN: 407 return "down"; 408 case BOND_LINK_BACK: 409 return "going back"; 410 default: 411 return "unknown"; 412 } 413 } 414 415 /* if <dev> supports MII link status reporting, check its link status. 416 * 417 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), 418 * depending upon the setting of the use_carrier parameter. 419 * 420 * Return either BMSR_LSTATUS, meaning that the link is up (or we 421 * can't tell and just pretend it is), or 0, meaning that the link is 422 * down. 423 * 424 * If reporting is non-zero, instead of faking link up, return -1 if 425 * both ETHTOOL and MII ioctls fail (meaning the device does not 426 * support them). If use_carrier is set, return whatever it says. 427 * It'd be nice if there was a good way to tell if a driver supports 428 * netif_carrier, but there really isn't. 429 */ 430 static int bond_check_dev_link(struct bonding *bond, 431 struct net_device *slave_dev, int reporting) 432 { 433 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 434 int (*ioctl)(struct net_device *, struct ifreq *, int); 435 struct ifreq ifr; 436 struct mii_ioctl_data *mii; 437 438 if (!reporting && !netif_running(slave_dev)) 439 return 0; 440 441 if (bond->params.use_carrier) 442 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; 443 444 /* Try to get link status using Ethtool first. */ 445 if (slave_dev->ethtool_ops->get_link) 446 return slave_dev->ethtool_ops->get_link(slave_dev) ? 447 BMSR_LSTATUS : 0; 448 449 /* Ethtool can't be used, fallback to MII ioctls. */ 450 ioctl = slave_ops->ndo_do_ioctl; 451 if (ioctl) { 452 /* TODO: set pointer to correct ioctl on a per team member 453 * bases to make this more efficient. that is, once 454 * we determine the correct ioctl, we will always 455 * call it and not the others for that team 456 * member. 457 */ 458 459 /* We cannot assume that SIOCGMIIPHY will also read a 460 * register; not all network drivers (e.g., e100) 461 * support that. 462 */ 463 464 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ 465 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ); 466 mii = if_mii(&ifr); 467 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) { 468 mii->reg_num = MII_BMSR; 469 if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0) 470 return mii->val_out & BMSR_LSTATUS; 471 } 472 } 473 474 /* If reporting, report that either there's no dev->do_ioctl, 475 * or both SIOCGMIIREG and get_link failed (meaning that we 476 * cannot report link status). If not reporting, pretend 477 * we're ok. 478 */ 479 return reporting ? -1 : BMSR_LSTATUS; 480 } 481 482 /*----------------------------- Multicast list ------------------------------*/ 483 484 /* Push the promiscuity flag down to appropriate slaves */ 485 static int bond_set_promiscuity(struct bonding *bond, int inc) 486 { 487 struct list_head *iter; 488 int err = 0; 489 490 if (bond_uses_primary(bond)) { 491 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 492 493 if (curr_active) 494 err = dev_set_promiscuity(curr_active->dev, inc); 495 } else { 496 struct slave *slave; 497 498 bond_for_each_slave(bond, slave, iter) { 499 err = dev_set_promiscuity(slave->dev, inc); 500 if (err) 501 return err; 502 } 503 } 504 return err; 505 } 506 507 /* Push the allmulti flag down to all slaves */ 508 static int bond_set_allmulti(struct bonding *bond, int inc) 509 { 510 struct list_head *iter; 511 int err = 0; 512 513 if (bond_uses_primary(bond)) { 514 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 515 516 if (curr_active) 517 err = dev_set_allmulti(curr_active->dev, inc); 518 } else { 519 struct slave *slave; 520 521 bond_for_each_slave(bond, slave, iter) { 522 err = dev_set_allmulti(slave->dev, inc); 523 if (err) 524 return err; 525 } 526 } 527 return err; 528 } 529 530 /* Retrieve the list of registered multicast addresses for the bonding 531 * device and retransmit an IGMP JOIN request to the current active 532 * slave. 533 */ 534 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work) 535 { 536 struct bonding *bond = container_of(work, struct bonding, 537 mcast_work.work); 538 539 if (!rtnl_trylock()) { 540 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 541 return; 542 } 543 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev); 544 545 if (bond->igmp_retrans > 1) { 546 bond->igmp_retrans--; 547 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); 548 } 549 rtnl_unlock(); 550 } 551 552 /* Flush bond's hardware addresses from slave */ 553 static void bond_hw_addr_flush(struct net_device *bond_dev, 554 struct net_device *slave_dev) 555 { 556 struct bonding *bond = netdev_priv(bond_dev); 557 558 dev_uc_unsync(slave_dev, bond_dev); 559 dev_mc_unsync(slave_dev, bond_dev); 560 561 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 562 /* del lacpdu mc addr from mc list */ 563 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 564 565 dev_mc_del(slave_dev, lacpdu_multicast); 566 } 567 } 568 569 /*--------------------------- Active slave change ---------------------------*/ 570 571 /* Update the hardware address list and promisc/allmulti for the new and 572 * old active slaves (if any). Modes that are not using primary keep all 573 * slaves up date at all times; only the modes that use primary need to call 574 * this function to swap these settings during a failover. 575 */ 576 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active, 577 struct slave *old_active) 578 { 579 if (old_active) { 580 if (bond->dev->flags & IFF_PROMISC) 581 dev_set_promiscuity(old_active->dev, -1); 582 583 if (bond->dev->flags & IFF_ALLMULTI) 584 dev_set_allmulti(old_active->dev, -1); 585 586 bond_hw_addr_flush(bond->dev, old_active->dev); 587 } 588 589 if (new_active) { 590 /* FIXME: Signal errors upstream. */ 591 if (bond->dev->flags & IFF_PROMISC) 592 dev_set_promiscuity(new_active->dev, 1); 593 594 if (bond->dev->flags & IFF_ALLMULTI) 595 dev_set_allmulti(new_active->dev, 1); 596 597 netif_addr_lock_bh(bond->dev); 598 dev_uc_sync(new_active->dev, bond->dev); 599 dev_mc_sync(new_active->dev, bond->dev); 600 netif_addr_unlock_bh(bond->dev); 601 } 602 } 603 604 /** 605 * bond_set_dev_addr - clone slave's address to bond 606 * @bond_dev: bond net device 607 * @slave_dev: slave net device 608 * 609 * Should be called with RTNL held. 610 */ 611 static void bond_set_dev_addr(struct net_device *bond_dev, 612 struct net_device *slave_dev) 613 { 614 netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->name=%s slave_dev->addr_len=%d\n", 615 bond_dev, slave_dev, slave_dev->name, slave_dev->addr_len); 616 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len); 617 bond_dev->addr_assign_type = NET_ADDR_STOLEN; 618 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev); 619 } 620 621 static struct slave *bond_get_old_active(struct bonding *bond, 622 struct slave *new_active) 623 { 624 struct slave *slave; 625 struct list_head *iter; 626 627 bond_for_each_slave(bond, slave, iter) { 628 if (slave == new_active) 629 continue; 630 631 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr)) 632 return slave; 633 } 634 635 return NULL; 636 } 637 638 /* bond_do_fail_over_mac 639 * 640 * Perform special MAC address swapping for fail_over_mac settings 641 * 642 * Called with RTNL 643 */ 644 static void bond_do_fail_over_mac(struct bonding *bond, 645 struct slave *new_active, 646 struct slave *old_active) 647 { 648 u8 tmp_mac[MAX_ADDR_LEN]; 649 struct sockaddr_storage ss; 650 int rv; 651 652 switch (bond->params.fail_over_mac) { 653 case BOND_FOM_ACTIVE: 654 if (new_active) 655 bond_set_dev_addr(bond->dev, new_active->dev); 656 break; 657 case BOND_FOM_FOLLOW: 658 /* if new_active && old_active, swap them 659 * if just old_active, do nothing (going to no active slave) 660 * if just new_active, set new_active to bond's MAC 661 */ 662 if (!new_active) 663 return; 664 665 if (!old_active) 666 old_active = bond_get_old_active(bond, new_active); 667 668 if (old_active) { 669 bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr, 670 new_active->dev->addr_len); 671 bond_hw_addr_copy(ss.__data, 672 old_active->dev->dev_addr, 673 old_active->dev->addr_len); 674 ss.ss_family = new_active->dev->type; 675 } else { 676 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr, 677 bond->dev->addr_len); 678 ss.ss_family = bond->dev->type; 679 } 680 681 rv = dev_set_mac_address(new_active->dev, 682 (struct sockaddr *)&ss); 683 if (rv) { 684 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n", 685 -rv, new_active->dev->name); 686 goto out; 687 } 688 689 if (!old_active) 690 goto out; 691 692 bond_hw_addr_copy(ss.__data, tmp_mac, 693 new_active->dev->addr_len); 694 ss.ss_family = old_active->dev->type; 695 696 rv = dev_set_mac_address(old_active->dev, 697 (struct sockaddr *)&ss); 698 if (rv) 699 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n", 700 -rv, new_active->dev->name); 701 out: 702 break; 703 default: 704 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n", 705 bond->params.fail_over_mac); 706 break; 707 } 708 709 } 710 711 static struct slave *bond_choose_primary_or_current(struct bonding *bond) 712 { 713 struct slave *prim = rtnl_dereference(bond->primary_slave); 714 struct slave *curr = rtnl_dereference(bond->curr_active_slave); 715 716 if (!prim || prim->link != BOND_LINK_UP) { 717 if (!curr || curr->link != BOND_LINK_UP) 718 return NULL; 719 return curr; 720 } 721 722 if (bond->force_primary) { 723 bond->force_primary = false; 724 return prim; 725 } 726 727 if (!curr || curr->link != BOND_LINK_UP) 728 return prim; 729 730 /* At this point, prim and curr are both up */ 731 switch (bond->params.primary_reselect) { 732 case BOND_PRI_RESELECT_ALWAYS: 733 return prim; 734 case BOND_PRI_RESELECT_BETTER: 735 if (prim->speed < curr->speed) 736 return curr; 737 if (prim->speed == curr->speed && prim->duplex <= curr->duplex) 738 return curr; 739 return prim; 740 case BOND_PRI_RESELECT_FAILURE: 741 return curr; 742 default: 743 netdev_err(bond->dev, "impossible primary_reselect %d\n", 744 bond->params.primary_reselect); 745 return curr; 746 } 747 } 748 749 /** 750 * bond_find_best_slave - select the best available slave to be the active one 751 * @bond: our bonding struct 752 */ 753 static struct slave *bond_find_best_slave(struct bonding *bond) 754 { 755 struct slave *slave, *bestslave = NULL; 756 struct list_head *iter; 757 int mintime = bond->params.updelay; 758 759 slave = bond_choose_primary_or_current(bond); 760 if (slave) 761 return slave; 762 763 bond_for_each_slave(bond, slave, iter) { 764 if (slave->link == BOND_LINK_UP) 765 return slave; 766 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) && 767 slave->delay < mintime) { 768 mintime = slave->delay; 769 bestslave = slave; 770 } 771 } 772 773 return bestslave; 774 } 775 776 static bool bond_should_notify_peers(struct bonding *bond) 777 { 778 struct slave *slave; 779 780 rcu_read_lock(); 781 slave = rcu_dereference(bond->curr_active_slave); 782 rcu_read_unlock(); 783 784 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n", 785 slave ? slave->dev->name : "NULL"); 786 787 if (!slave || !bond->send_peer_notif || 788 !netif_carrier_ok(bond->dev) || 789 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) 790 return false; 791 792 return true; 793 } 794 795 /** 796 * change_active_interface - change the active slave into the specified one 797 * @bond: our bonding struct 798 * @new: the new slave to make the active one 799 * 800 * Set the new slave to the bond's settings and unset them on the old 801 * curr_active_slave. 802 * Setting include flags, mc-list, promiscuity, allmulti, etc. 803 * 804 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, 805 * because it is apparently the best available slave we have, even though its 806 * updelay hasn't timed out yet. 807 * 808 * Caller must hold RTNL. 809 */ 810 void bond_change_active_slave(struct bonding *bond, struct slave *new_active) 811 { 812 struct slave *old_active; 813 814 ASSERT_RTNL(); 815 816 old_active = rtnl_dereference(bond->curr_active_slave); 817 818 if (old_active == new_active) 819 return; 820 821 if (new_active) { 822 new_active->last_link_up = jiffies; 823 824 if (new_active->link == BOND_LINK_BACK) { 825 if (bond_uses_primary(bond)) { 826 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n", 827 new_active->dev->name, 828 (bond->params.updelay - new_active->delay) * bond->params.miimon); 829 } 830 831 new_active->delay = 0; 832 bond_set_slave_link_state(new_active, BOND_LINK_UP, 833 BOND_SLAVE_NOTIFY_NOW); 834 835 if (BOND_MODE(bond) == BOND_MODE_8023AD) 836 bond_3ad_handle_link_change(new_active, BOND_LINK_UP); 837 838 if (bond_is_lb(bond)) 839 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); 840 } else { 841 if (bond_uses_primary(bond)) { 842 netdev_info(bond->dev, "making interface %s the new active one\n", 843 new_active->dev->name); 844 } 845 } 846 } 847 848 if (bond_uses_primary(bond)) 849 bond_hw_addr_swap(bond, new_active, old_active); 850 851 if (bond_is_lb(bond)) { 852 bond_alb_handle_active_change(bond, new_active); 853 if (old_active) 854 bond_set_slave_inactive_flags(old_active, 855 BOND_SLAVE_NOTIFY_NOW); 856 if (new_active) 857 bond_set_slave_active_flags(new_active, 858 BOND_SLAVE_NOTIFY_NOW); 859 } else { 860 rcu_assign_pointer(bond->curr_active_slave, new_active); 861 } 862 863 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) { 864 if (old_active) 865 bond_set_slave_inactive_flags(old_active, 866 BOND_SLAVE_NOTIFY_NOW); 867 868 if (new_active) { 869 bool should_notify_peers = false; 870 871 bond_set_slave_active_flags(new_active, 872 BOND_SLAVE_NOTIFY_NOW); 873 874 if (bond->params.fail_over_mac) 875 bond_do_fail_over_mac(bond, new_active, 876 old_active); 877 878 if (netif_running(bond->dev)) { 879 bond->send_peer_notif = 880 bond->params.num_peer_notif; 881 should_notify_peers = 882 bond_should_notify_peers(bond); 883 } 884 885 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev); 886 if (should_notify_peers) 887 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 888 bond->dev); 889 } 890 } 891 892 /* resend IGMP joins since active slave has changed or 893 * all were sent on curr_active_slave. 894 * resend only if bond is brought up with the affected 895 * bonding modes and the retransmission is enabled 896 */ 897 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && 898 ((bond_uses_primary(bond) && new_active) || 899 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) { 900 bond->igmp_retrans = bond->params.resend_igmp; 901 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 902 } 903 } 904 905 /** 906 * bond_select_active_slave - select a new active slave, if needed 907 * @bond: our bonding struct 908 * 909 * This functions should be called when one of the following occurs: 910 * - The old curr_active_slave has been released or lost its link. 911 * - The primary_slave has got its link back. 912 * - A slave has got its link back and there's no old curr_active_slave. 913 * 914 * Caller must hold RTNL. 915 */ 916 void bond_select_active_slave(struct bonding *bond) 917 { 918 struct slave *best_slave; 919 int rv; 920 921 ASSERT_RTNL(); 922 923 best_slave = bond_find_best_slave(bond); 924 if (best_slave != rtnl_dereference(bond->curr_active_slave)) { 925 bond_change_active_slave(bond, best_slave); 926 rv = bond_set_carrier(bond); 927 if (!rv) 928 return; 929 930 if (netif_carrier_ok(bond->dev)) 931 netdev_info(bond->dev, "first active interface up!\n"); 932 else 933 netdev_info(bond->dev, "now running without any active interface!\n"); 934 } 935 } 936 937 #ifdef CONFIG_NET_POLL_CONTROLLER 938 static inline int slave_enable_netpoll(struct slave *slave) 939 { 940 struct netpoll *np; 941 int err = 0; 942 943 np = kzalloc(sizeof(*np), GFP_KERNEL); 944 err = -ENOMEM; 945 if (!np) 946 goto out; 947 948 err = __netpoll_setup(np, slave->dev); 949 if (err) { 950 kfree(np); 951 goto out; 952 } 953 slave->np = np; 954 out: 955 return err; 956 } 957 static inline void slave_disable_netpoll(struct slave *slave) 958 { 959 struct netpoll *np = slave->np; 960 961 if (!np) 962 return; 963 964 slave->np = NULL; 965 __netpoll_free_async(np); 966 } 967 968 static void bond_poll_controller(struct net_device *bond_dev) 969 { 970 struct bonding *bond = netdev_priv(bond_dev); 971 struct slave *slave = NULL; 972 struct list_head *iter; 973 struct ad_info ad_info; 974 struct netpoll_info *ni; 975 const struct net_device_ops *ops; 976 977 if (BOND_MODE(bond) == BOND_MODE_8023AD) 978 if (bond_3ad_get_active_agg_info(bond, &ad_info)) 979 return; 980 981 bond_for_each_slave_rcu(bond, slave, iter) { 982 ops = slave->dev->netdev_ops; 983 if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller) 984 continue; 985 986 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 987 struct aggregator *agg = 988 SLAVE_AD_INFO(slave)->port.aggregator; 989 990 if (agg && 991 agg->aggregator_identifier != ad_info.aggregator_id) 992 continue; 993 } 994 995 ni = rcu_dereference_bh(slave->dev->npinfo); 996 if (down_trylock(&ni->dev_lock)) 997 continue; 998 ops->ndo_poll_controller(slave->dev); 999 up(&ni->dev_lock); 1000 } 1001 } 1002 1003 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1004 { 1005 struct bonding *bond = netdev_priv(bond_dev); 1006 struct list_head *iter; 1007 struct slave *slave; 1008 1009 bond_for_each_slave(bond, slave, iter) 1010 if (bond_slave_is_up(slave)) 1011 slave_disable_netpoll(slave); 1012 } 1013 1014 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) 1015 { 1016 struct bonding *bond = netdev_priv(dev); 1017 struct list_head *iter; 1018 struct slave *slave; 1019 int err = 0; 1020 1021 bond_for_each_slave(bond, slave, iter) { 1022 err = slave_enable_netpoll(slave); 1023 if (err) { 1024 bond_netpoll_cleanup(dev); 1025 break; 1026 } 1027 } 1028 return err; 1029 } 1030 #else 1031 static inline int slave_enable_netpoll(struct slave *slave) 1032 { 1033 return 0; 1034 } 1035 static inline void slave_disable_netpoll(struct slave *slave) 1036 { 1037 } 1038 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1039 { 1040 } 1041 #endif 1042 1043 /*---------------------------------- IOCTL ----------------------------------*/ 1044 1045 static netdev_features_t bond_fix_features(struct net_device *dev, 1046 netdev_features_t features) 1047 { 1048 struct bonding *bond = netdev_priv(dev); 1049 struct list_head *iter; 1050 netdev_features_t mask; 1051 struct slave *slave; 1052 1053 mask = features; 1054 1055 features &= ~NETIF_F_ONE_FOR_ALL; 1056 features |= NETIF_F_ALL_FOR_ALL; 1057 1058 bond_for_each_slave(bond, slave, iter) { 1059 features = netdev_increment_features(features, 1060 slave->dev->features, 1061 mask); 1062 } 1063 features = netdev_add_tso_features(features, mask); 1064 1065 return features; 1066 } 1067 1068 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1069 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \ 1070 NETIF_F_HIGHDMA | NETIF_F_LRO) 1071 1072 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1073 NETIF_F_RXCSUM | NETIF_F_ALL_TSO) 1074 1075 static void bond_compute_features(struct bonding *bond) 1076 { 1077 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE | 1078 IFF_XMIT_DST_RELEASE_PERM; 1079 netdev_features_t vlan_features = BOND_VLAN_FEATURES; 1080 netdev_features_t enc_features = BOND_ENC_FEATURES; 1081 struct net_device *bond_dev = bond->dev; 1082 struct list_head *iter; 1083 struct slave *slave; 1084 unsigned short max_hard_header_len = ETH_HLEN; 1085 unsigned int gso_max_size = GSO_MAX_SIZE; 1086 u16 gso_max_segs = GSO_MAX_SEGS; 1087 1088 if (!bond_has_slaves(bond)) 1089 goto done; 1090 vlan_features &= NETIF_F_ALL_FOR_ALL; 1091 1092 bond_for_each_slave(bond, slave, iter) { 1093 vlan_features = netdev_increment_features(vlan_features, 1094 slave->dev->vlan_features, BOND_VLAN_FEATURES); 1095 1096 enc_features = netdev_increment_features(enc_features, 1097 slave->dev->hw_enc_features, 1098 BOND_ENC_FEATURES); 1099 dst_release_flag &= slave->dev->priv_flags; 1100 if (slave->dev->hard_header_len > max_hard_header_len) 1101 max_hard_header_len = slave->dev->hard_header_len; 1102 1103 gso_max_size = min(gso_max_size, slave->dev->gso_max_size); 1104 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs); 1105 } 1106 bond_dev->hard_header_len = max_hard_header_len; 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->gso_max_segs = gso_max_segs; 1112 netif_set_gso_max_size(bond_dev, gso_max_size); 1113 1114 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1115 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) && 1116 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM)) 1117 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE; 1118 1119 netdev_change_features(bond_dev); 1120 } 1121 1122 static void bond_setup_by_slave(struct net_device *bond_dev, 1123 struct net_device *slave_dev) 1124 { 1125 bond_dev->header_ops = slave_dev->header_ops; 1126 1127 bond_dev->type = slave_dev->type; 1128 bond_dev->hard_header_len = slave_dev->hard_header_len; 1129 bond_dev->addr_len = slave_dev->addr_len; 1130 1131 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1132 slave_dev->addr_len); 1133 } 1134 1135 /* On bonding slaves other than the currently active slave, suppress 1136 * duplicates except for alb non-mcast/bcast. 1137 */ 1138 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1139 struct slave *slave, 1140 struct bonding *bond) 1141 { 1142 if (bond_is_slave_inactive(slave)) { 1143 if (BOND_MODE(bond) == BOND_MODE_ALB && 1144 skb->pkt_type != PACKET_BROADCAST && 1145 skb->pkt_type != PACKET_MULTICAST) 1146 return false; 1147 return true; 1148 } 1149 return false; 1150 } 1151 1152 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1153 { 1154 struct sk_buff *skb = *pskb; 1155 struct slave *slave; 1156 struct bonding *bond; 1157 int (*recv_probe)(const struct sk_buff *, struct bonding *, 1158 struct slave *); 1159 int ret = RX_HANDLER_ANOTHER; 1160 1161 skb = skb_share_check(skb, GFP_ATOMIC); 1162 if (unlikely(!skb)) 1163 return RX_HANDLER_CONSUMED; 1164 1165 *pskb = skb; 1166 1167 slave = bond_slave_get_rcu(skb->dev); 1168 bond = slave->bond; 1169 1170 recv_probe = ACCESS_ONCE(bond->recv_probe); 1171 if (recv_probe) { 1172 ret = recv_probe(skb, bond, slave); 1173 if (ret == RX_HANDLER_CONSUMED) { 1174 consume_skb(skb); 1175 return ret; 1176 } 1177 } 1178 1179 /* don't change skb->dev for link-local packets */ 1180 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest)) 1181 return RX_HANDLER_PASS; 1182 if (bond_should_deliver_exact_match(skb, slave, bond)) 1183 return RX_HANDLER_EXACT; 1184 1185 skb->dev = bond->dev; 1186 1187 if (BOND_MODE(bond) == BOND_MODE_ALB && 1188 bond->dev->priv_flags & IFF_BRIDGE_PORT && 1189 skb->pkt_type == PACKET_HOST) { 1190 1191 if (unlikely(skb_cow_head(skb, 1192 skb->data - skb_mac_header(skb)))) { 1193 kfree_skb(skb); 1194 return RX_HANDLER_CONSUMED; 1195 } 1196 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, 1197 bond->dev->addr_len); 1198 } 1199 1200 return ret; 1201 } 1202 1203 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond) 1204 { 1205 switch (BOND_MODE(bond)) { 1206 case BOND_MODE_ROUNDROBIN: 1207 return NETDEV_LAG_TX_TYPE_ROUNDROBIN; 1208 case BOND_MODE_ACTIVEBACKUP: 1209 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP; 1210 case BOND_MODE_BROADCAST: 1211 return NETDEV_LAG_TX_TYPE_BROADCAST; 1212 case BOND_MODE_XOR: 1213 case BOND_MODE_8023AD: 1214 return NETDEV_LAG_TX_TYPE_HASH; 1215 default: 1216 return NETDEV_LAG_TX_TYPE_UNKNOWN; 1217 } 1218 } 1219 1220 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave) 1221 { 1222 struct netdev_lag_upper_info lag_upper_info; 1223 int err; 1224 1225 lag_upper_info.tx_type = bond_lag_tx_type(bond); 1226 err = netdev_master_upper_dev_link(slave->dev, bond->dev, slave, 1227 &lag_upper_info); 1228 if (err) 1229 return err; 1230 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL); 1231 return 0; 1232 } 1233 1234 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave) 1235 { 1236 netdev_upper_dev_unlink(slave->dev, bond->dev); 1237 slave->dev->flags &= ~IFF_SLAVE; 1238 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL); 1239 } 1240 1241 static struct slave *bond_alloc_slave(struct bonding *bond) 1242 { 1243 struct slave *slave = NULL; 1244 1245 slave = kzalloc(sizeof(*slave), GFP_KERNEL); 1246 if (!slave) 1247 return NULL; 1248 1249 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1250 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info), 1251 GFP_KERNEL); 1252 if (!SLAVE_AD_INFO(slave)) { 1253 kfree(slave); 1254 return NULL; 1255 } 1256 } 1257 return slave; 1258 } 1259 1260 static void bond_free_slave(struct slave *slave) 1261 { 1262 struct bonding *bond = bond_get_bond_by_slave(slave); 1263 1264 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1265 kfree(SLAVE_AD_INFO(slave)); 1266 1267 kfree(slave); 1268 } 1269 1270 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info) 1271 { 1272 info->bond_mode = BOND_MODE(bond); 1273 info->miimon = bond->params.miimon; 1274 info->num_slaves = bond->slave_cnt; 1275 } 1276 1277 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info) 1278 { 1279 strcpy(info->slave_name, slave->dev->name); 1280 info->link = slave->link; 1281 info->state = bond_slave_state(slave); 1282 info->link_failure_count = slave->link_failure_count; 1283 } 1284 1285 static void bond_netdev_notify(struct net_device *dev, 1286 struct netdev_bonding_info *info) 1287 { 1288 rtnl_lock(); 1289 netdev_bonding_info_change(dev, info); 1290 rtnl_unlock(); 1291 } 1292 1293 static void bond_netdev_notify_work(struct work_struct *_work) 1294 { 1295 struct netdev_notify_work *w = 1296 container_of(_work, struct netdev_notify_work, work.work); 1297 1298 bond_netdev_notify(w->dev, &w->bonding_info); 1299 dev_put(w->dev); 1300 kfree(w); 1301 } 1302 1303 void bond_queue_slave_event(struct slave *slave) 1304 { 1305 struct bonding *bond = slave->bond; 1306 struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC); 1307 1308 if (!nnw) 1309 return; 1310 1311 dev_hold(slave->dev); 1312 nnw->dev = slave->dev; 1313 bond_fill_ifslave(slave, &nnw->bonding_info.slave); 1314 bond_fill_ifbond(bond, &nnw->bonding_info.master); 1315 INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work); 1316 1317 queue_delayed_work(slave->bond->wq, &nnw->work, 0); 1318 } 1319 1320 void bond_lower_state_changed(struct slave *slave) 1321 { 1322 struct netdev_lag_lower_state_info info; 1323 1324 info.link_up = slave->link == BOND_LINK_UP || 1325 slave->link == BOND_LINK_FAIL; 1326 info.tx_enabled = bond_is_active_slave(slave); 1327 netdev_lower_state_changed(slave->dev, &info); 1328 } 1329 1330 /* enslave device <slave> to bond device <master> */ 1331 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev) 1332 { 1333 struct bonding *bond = netdev_priv(bond_dev); 1334 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1335 struct slave *new_slave = NULL, *prev_slave; 1336 struct sockaddr_storage ss; 1337 int link_reporting; 1338 int res = 0, i; 1339 1340 if (!bond->params.use_carrier && 1341 slave_dev->ethtool_ops->get_link == NULL && 1342 slave_ops->ndo_do_ioctl == NULL) { 1343 netdev_warn(bond_dev, "no link monitoring support for %s\n", 1344 slave_dev->name); 1345 } 1346 1347 /* already in-use? */ 1348 if (netdev_is_rx_handler_busy(slave_dev)) { 1349 netdev_err(bond_dev, 1350 "Error: Device is in use and cannot be enslaved\n"); 1351 return -EBUSY; 1352 } 1353 1354 if (bond_dev == slave_dev) { 1355 netdev_err(bond_dev, "cannot enslave bond to itself.\n"); 1356 return -EPERM; 1357 } 1358 1359 /* vlan challenged mutual exclusion */ 1360 /* no need to lock since we're protected by rtnl_lock */ 1361 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1362 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n", 1363 slave_dev->name); 1364 if (vlan_uses_dev(bond_dev)) { 1365 netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n", 1366 slave_dev->name, bond_dev->name); 1367 return -EPERM; 1368 } else { 1369 netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n", 1370 slave_dev->name, slave_dev->name, 1371 bond_dev->name); 1372 } 1373 } else { 1374 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n", 1375 slave_dev->name); 1376 } 1377 1378 /* Old ifenslave binaries are no longer supported. These can 1379 * be identified with moderate accuracy by the state of the slave: 1380 * the current ifenslave will set the interface down prior to 1381 * enslaving it; the old ifenslave will not. 1382 */ 1383 if (slave_dev->flags & IFF_UP) { 1384 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n", 1385 slave_dev->name); 1386 return -EPERM; 1387 } 1388 1389 /* set bonding device ether type by slave - bonding netdevices are 1390 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1391 * there is a need to override some of the type dependent attribs/funcs. 1392 * 1393 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1394 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1395 */ 1396 if (!bond_has_slaves(bond)) { 1397 if (bond_dev->type != slave_dev->type) { 1398 netdev_dbg(bond_dev, "change device type from %d to %d\n", 1399 bond_dev->type, slave_dev->type); 1400 1401 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, 1402 bond_dev); 1403 res = notifier_to_errno(res); 1404 if (res) { 1405 netdev_err(bond_dev, "refused to change device type\n"); 1406 return -EBUSY; 1407 } 1408 1409 /* Flush unicast and multicast addresses */ 1410 dev_uc_flush(bond_dev); 1411 dev_mc_flush(bond_dev); 1412 1413 if (slave_dev->type != ARPHRD_ETHER) 1414 bond_setup_by_slave(bond_dev, slave_dev); 1415 else { 1416 ether_setup(bond_dev); 1417 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1418 } 1419 1420 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, 1421 bond_dev); 1422 } 1423 } else if (bond_dev->type != slave_dev->type) { 1424 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n", 1425 slave_dev->name, slave_dev->type, bond_dev->type); 1426 return -EINVAL; 1427 } 1428 1429 if (slave_dev->type == ARPHRD_INFINIBAND && 1430 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1431 netdev_warn(bond_dev, "Type (%d) supports only active-backup mode\n", 1432 slave_dev->type); 1433 res = -EOPNOTSUPP; 1434 goto err_undo_flags; 1435 } 1436 1437 if (!slave_ops->ndo_set_mac_address || 1438 slave_dev->type == ARPHRD_INFINIBAND) { 1439 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n"); 1440 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP && 1441 bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1442 if (!bond_has_slaves(bond)) { 1443 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1444 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n"); 1445 } else { 1446 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"); 1447 res = -EOPNOTSUPP; 1448 goto err_undo_flags; 1449 } 1450 } 1451 } 1452 1453 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1454 1455 /* If this is the first slave, then we need to set the master's hardware 1456 * address to be the same as the slave's. 1457 */ 1458 if (!bond_has_slaves(bond) && 1459 bond->dev->addr_assign_type == NET_ADDR_RANDOM) 1460 bond_set_dev_addr(bond->dev, slave_dev); 1461 1462 new_slave = bond_alloc_slave(bond); 1463 if (!new_slave) { 1464 res = -ENOMEM; 1465 goto err_undo_flags; 1466 } 1467 1468 new_slave->bond = bond; 1469 new_slave->dev = slave_dev; 1470 /* Set the new_slave's queue_id to be zero. Queue ID mapping 1471 * is set via sysfs or module option if desired. 1472 */ 1473 new_slave->queue_id = 0; 1474 1475 /* Save slave's original mtu and then set it to match the bond */ 1476 new_slave->original_mtu = slave_dev->mtu; 1477 res = dev_set_mtu(slave_dev, bond->dev->mtu); 1478 if (res) { 1479 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res); 1480 goto err_free; 1481 } 1482 1483 /* Save slave's original ("permanent") mac address for modes 1484 * that need it, and for restoring it upon release, and then 1485 * set it to the master's address 1486 */ 1487 bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr, 1488 slave_dev->addr_len); 1489 1490 if (!bond->params.fail_over_mac || 1491 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1492 /* Set slave to master's mac address. The application already 1493 * set the master's mac address to that of the first slave 1494 */ 1495 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 1496 ss.ss_family = slave_dev->type; 1497 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss); 1498 if (res) { 1499 netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res); 1500 goto err_restore_mtu; 1501 } 1502 } 1503 1504 /* set slave flag before open to prevent IPv6 addrconf */ 1505 slave_dev->flags |= IFF_SLAVE; 1506 1507 /* open the slave since the application closed it */ 1508 res = dev_open(slave_dev); 1509 if (res) { 1510 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name); 1511 goto err_restore_mac; 1512 } 1513 1514 slave_dev->priv_flags |= IFF_BONDING; 1515 /* initialize slave stats */ 1516 dev_get_stats(new_slave->dev, &new_slave->slave_stats); 1517 1518 if (bond_is_lb(bond)) { 1519 /* bond_alb_init_slave() must be called before all other stages since 1520 * it might fail and we do not want to have to undo everything 1521 */ 1522 res = bond_alb_init_slave(bond, new_slave); 1523 if (res) 1524 goto err_close; 1525 } 1526 1527 /* If the mode uses primary, then the following is handled by 1528 * bond_change_active_slave(). 1529 */ 1530 if (!bond_uses_primary(bond)) { 1531 /* set promiscuity level to new slave */ 1532 if (bond_dev->flags & IFF_PROMISC) { 1533 res = dev_set_promiscuity(slave_dev, 1); 1534 if (res) 1535 goto err_close; 1536 } 1537 1538 /* set allmulti level to new slave */ 1539 if (bond_dev->flags & IFF_ALLMULTI) { 1540 res = dev_set_allmulti(slave_dev, 1); 1541 if (res) 1542 goto err_close; 1543 } 1544 1545 netif_addr_lock_bh(bond_dev); 1546 1547 dev_mc_sync_multiple(slave_dev, bond_dev); 1548 dev_uc_sync_multiple(slave_dev, bond_dev); 1549 1550 netif_addr_unlock_bh(bond_dev); 1551 } 1552 1553 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1554 /* add lacpdu mc addr to mc list */ 1555 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 1556 1557 dev_mc_add(slave_dev, lacpdu_multicast); 1558 } 1559 1560 res = vlan_vids_add_by_dev(slave_dev, bond_dev); 1561 if (res) { 1562 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n", 1563 slave_dev->name); 1564 goto err_close; 1565 } 1566 1567 prev_slave = bond_last_slave(bond); 1568 1569 new_slave->delay = 0; 1570 new_slave->link_failure_count = 0; 1571 1572 if (bond_update_speed_duplex(new_slave)) 1573 new_slave->link = BOND_LINK_DOWN; 1574 1575 new_slave->last_rx = jiffies - 1576 (msecs_to_jiffies(bond->params.arp_interval) + 1); 1577 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) 1578 new_slave->target_last_arp_rx[i] = new_slave->last_rx; 1579 1580 if (bond->params.miimon && !bond->params.use_carrier) { 1581 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 1582 1583 if ((link_reporting == -1) && !bond->params.arp_interval) { 1584 /* miimon is set but a bonded network driver 1585 * does not support ETHTOOL/MII and 1586 * arp_interval is not set. Note: if 1587 * use_carrier is enabled, we will never go 1588 * here (because netif_carrier is always 1589 * supported); thus, we don't need to change 1590 * the messages for netif_carrier. 1591 */ 1592 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", 1593 slave_dev->name); 1594 } else if (link_reporting == -1) { 1595 /* unable get link status using mii/ethtool */ 1596 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", 1597 slave_dev->name); 1598 } 1599 } 1600 1601 /* check for initial state */ 1602 new_slave->link = BOND_LINK_NOCHANGE; 1603 if (bond->params.miimon) { 1604 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { 1605 if (bond->params.updelay) { 1606 bond_set_slave_link_state(new_slave, 1607 BOND_LINK_BACK, 1608 BOND_SLAVE_NOTIFY_NOW); 1609 new_slave->delay = bond->params.updelay; 1610 } else { 1611 bond_set_slave_link_state(new_slave, 1612 BOND_LINK_UP, 1613 BOND_SLAVE_NOTIFY_NOW); 1614 } 1615 } else { 1616 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN, 1617 BOND_SLAVE_NOTIFY_NOW); 1618 } 1619 } else if (bond->params.arp_interval) { 1620 bond_set_slave_link_state(new_slave, 1621 (netif_carrier_ok(slave_dev) ? 1622 BOND_LINK_UP : BOND_LINK_DOWN), 1623 BOND_SLAVE_NOTIFY_NOW); 1624 } else { 1625 bond_set_slave_link_state(new_slave, BOND_LINK_UP, 1626 BOND_SLAVE_NOTIFY_NOW); 1627 } 1628 1629 if (new_slave->link != BOND_LINK_DOWN) 1630 new_slave->last_link_up = jiffies; 1631 netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n", 1632 new_slave->link == BOND_LINK_DOWN ? "DOWN" : 1633 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); 1634 1635 if (bond_uses_primary(bond) && bond->params.primary[0]) { 1636 /* if there is a primary slave, remember it */ 1637 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 1638 rcu_assign_pointer(bond->primary_slave, new_slave); 1639 bond->force_primary = true; 1640 } 1641 } 1642 1643 switch (BOND_MODE(bond)) { 1644 case BOND_MODE_ACTIVEBACKUP: 1645 bond_set_slave_inactive_flags(new_slave, 1646 BOND_SLAVE_NOTIFY_NOW); 1647 break; 1648 case BOND_MODE_8023AD: 1649 /* in 802.3ad mode, the internal mechanism 1650 * will activate the slaves in the selected 1651 * aggregator 1652 */ 1653 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 1654 /* if this is the first slave */ 1655 if (!prev_slave) { 1656 SLAVE_AD_INFO(new_slave)->id = 1; 1657 /* Initialize AD with the number of times that the AD timer is called in 1 second 1658 * can be called only after the mac address of the bond is set 1659 */ 1660 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL); 1661 } else { 1662 SLAVE_AD_INFO(new_slave)->id = 1663 SLAVE_AD_INFO(prev_slave)->id + 1; 1664 } 1665 1666 bond_3ad_bind_slave(new_slave); 1667 break; 1668 case BOND_MODE_TLB: 1669 case BOND_MODE_ALB: 1670 bond_set_active_slave(new_slave); 1671 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 1672 break; 1673 default: 1674 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n"); 1675 1676 /* always active in trunk mode */ 1677 bond_set_active_slave(new_slave); 1678 1679 /* In trunking mode there is little meaning to curr_active_slave 1680 * anyway (it holds no special properties of the bond device), 1681 * so we can change it without calling change_active_interface() 1682 */ 1683 if (!rcu_access_pointer(bond->curr_active_slave) && 1684 new_slave->link == BOND_LINK_UP) 1685 rcu_assign_pointer(bond->curr_active_slave, new_slave); 1686 1687 break; 1688 } /* switch(bond_mode) */ 1689 1690 #ifdef CONFIG_NET_POLL_CONTROLLER 1691 slave_dev->npinfo = bond->dev->npinfo; 1692 if (slave_dev->npinfo) { 1693 if (slave_enable_netpoll(new_slave)) { 1694 netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n"); 1695 res = -EBUSY; 1696 goto err_detach; 1697 } 1698 } 1699 #endif 1700 1701 if (!(bond_dev->features & NETIF_F_LRO)) 1702 dev_disable_lro(slave_dev); 1703 1704 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 1705 new_slave); 1706 if (res) { 1707 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res); 1708 goto err_detach; 1709 } 1710 1711 res = bond_master_upper_dev_link(bond, new_slave); 1712 if (res) { 1713 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res); 1714 goto err_unregister; 1715 } 1716 1717 res = bond_sysfs_slave_add(new_slave); 1718 if (res) { 1719 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res); 1720 goto err_upper_unlink; 1721 } 1722 1723 bond->slave_cnt++; 1724 bond_compute_features(bond); 1725 bond_set_carrier(bond); 1726 1727 if (bond_uses_primary(bond)) { 1728 block_netpoll_tx(); 1729 bond_select_active_slave(bond); 1730 unblock_netpoll_tx(); 1731 } 1732 1733 if (bond_mode_uses_xmit_hash(bond)) 1734 bond_update_slave_arr(bond, NULL); 1735 1736 netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n", 1737 slave_dev->name, 1738 bond_is_active_slave(new_slave) ? "an active" : "a backup", 1739 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down"); 1740 1741 /* enslave is successful */ 1742 bond_queue_slave_event(new_slave); 1743 return 0; 1744 1745 /* Undo stages on error */ 1746 err_upper_unlink: 1747 bond_upper_dev_unlink(bond, new_slave); 1748 1749 err_unregister: 1750 netdev_rx_handler_unregister(slave_dev); 1751 1752 err_detach: 1753 if (!bond_uses_primary(bond)) 1754 bond_hw_addr_flush(bond_dev, slave_dev); 1755 1756 vlan_vids_del_by_dev(slave_dev, bond_dev); 1757 if (rcu_access_pointer(bond->primary_slave) == new_slave) 1758 RCU_INIT_POINTER(bond->primary_slave, NULL); 1759 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) { 1760 block_netpoll_tx(); 1761 bond_change_active_slave(bond, NULL); 1762 bond_select_active_slave(bond); 1763 unblock_netpoll_tx(); 1764 } 1765 /* either primary_slave or curr_active_slave might've changed */ 1766 synchronize_rcu(); 1767 slave_disable_netpoll(new_slave); 1768 1769 err_close: 1770 slave_dev->priv_flags &= ~IFF_BONDING; 1771 dev_close(slave_dev); 1772 1773 err_restore_mac: 1774 slave_dev->flags &= ~IFF_SLAVE; 1775 if (!bond->params.fail_over_mac || 1776 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1777 /* XXX TODO - fom follow mode needs to change master's 1778 * MAC if this slave's MAC is in use by the bond, or at 1779 * least print a warning. 1780 */ 1781 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr, 1782 new_slave->dev->addr_len); 1783 ss.ss_family = slave_dev->type; 1784 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss); 1785 } 1786 1787 err_restore_mtu: 1788 dev_set_mtu(slave_dev, new_slave->original_mtu); 1789 1790 err_free: 1791 bond_free_slave(new_slave); 1792 1793 err_undo_flags: 1794 /* Enslave of first slave has failed and we need to fix master's mac */ 1795 if (!bond_has_slaves(bond)) { 1796 if (ether_addr_equal_64bits(bond_dev->dev_addr, 1797 slave_dev->dev_addr)) 1798 eth_hw_addr_random(bond_dev); 1799 if (bond_dev->type != ARPHRD_ETHER) { 1800 dev_close(bond_dev); 1801 ether_setup(bond_dev); 1802 bond_dev->flags |= IFF_MASTER; 1803 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1804 } 1805 } 1806 1807 return res; 1808 } 1809 1810 /* Try to release the slave device <slave> from the bond device <master> 1811 * It is legal to access curr_active_slave without a lock because all the function 1812 * is RTNL-locked. If "all" is true it means that the function is being called 1813 * while destroying a bond interface and all slaves are being released. 1814 * 1815 * The rules for slave state should be: 1816 * for Active/Backup: 1817 * Active stays on all backups go down 1818 * for Bonded connections: 1819 * The first up interface should be left on and all others downed. 1820 */ 1821 static int __bond_release_one(struct net_device *bond_dev, 1822 struct net_device *slave_dev, 1823 bool all) 1824 { 1825 struct bonding *bond = netdev_priv(bond_dev); 1826 struct slave *slave, *oldcurrent; 1827 struct sockaddr_storage ss; 1828 int old_flags = bond_dev->flags; 1829 netdev_features_t old_features = bond_dev->features; 1830 1831 /* slave is not a slave or master is not master of this slave */ 1832 if (!(slave_dev->flags & IFF_SLAVE) || 1833 !netdev_has_upper_dev(slave_dev, bond_dev)) { 1834 netdev_dbg(bond_dev, "cannot release %s\n", 1835 slave_dev->name); 1836 return -EINVAL; 1837 } 1838 1839 block_netpoll_tx(); 1840 1841 slave = bond_get_slave_by_dev(bond, slave_dev); 1842 if (!slave) { 1843 /* not a slave of this bond */ 1844 netdev_info(bond_dev, "%s not enslaved\n", 1845 slave_dev->name); 1846 unblock_netpoll_tx(); 1847 return -EINVAL; 1848 } 1849 1850 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW); 1851 1852 bond_sysfs_slave_del(slave); 1853 1854 /* recompute stats just before removing the slave */ 1855 bond_get_stats(bond->dev, &bond->bond_stats); 1856 1857 bond_upper_dev_unlink(bond, slave); 1858 /* unregister rx_handler early so bond_handle_frame wouldn't be called 1859 * for this slave anymore. 1860 */ 1861 netdev_rx_handler_unregister(slave_dev); 1862 1863 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1864 bond_3ad_unbind_slave(slave); 1865 1866 if (bond_mode_uses_xmit_hash(bond)) 1867 bond_update_slave_arr(bond, slave); 1868 1869 netdev_info(bond_dev, "Releasing %s interface %s\n", 1870 bond_is_active_slave(slave) ? "active" : "backup", 1871 slave_dev->name); 1872 1873 oldcurrent = rcu_access_pointer(bond->curr_active_slave); 1874 1875 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 1876 1877 if (!all && (!bond->params.fail_over_mac || 1878 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) { 1879 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) && 1880 bond_has_slaves(bond)) 1881 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", 1882 slave_dev->name, slave->perm_hwaddr, 1883 bond_dev->name, slave_dev->name); 1884 } 1885 1886 if (rtnl_dereference(bond->primary_slave) == slave) 1887 RCU_INIT_POINTER(bond->primary_slave, NULL); 1888 1889 if (oldcurrent == slave) 1890 bond_change_active_slave(bond, NULL); 1891 1892 if (bond_is_lb(bond)) { 1893 /* Must be called only after the slave has been 1894 * detached from the list and the curr_active_slave 1895 * has been cleared (if our_slave == old_current), 1896 * but before a new active slave is selected. 1897 */ 1898 bond_alb_deinit_slave(bond, slave); 1899 } 1900 1901 if (all) { 1902 RCU_INIT_POINTER(bond->curr_active_slave, NULL); 1903 } else if (oldcurrent == slave) { 1904 /* Note that we hold RTNL over this sequence, so there 1905 * is no concern that another slave add/remove event 1906 * will interfere. 1907 */ 1908 bond_select_active_slave(bond); 1909 } 1910 1911 if (!bond_has_slaves(bond)) { 1912 bond_set_carrier(bond); 1913 eth_hw_addr_random(bond_dev); 1914 } 1915 1916 unblock_netpoll_tx(); 1917 synchronize_rcu(); 1918 bond->slave_cnt--; 1919 1920 if (!bond_has_slaves(bond)) { 1921 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 1922 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev); 1923 } 1924 1925 bond_compute_features(bond); 1926 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 1927 (old_features & NETIF_F_VLAN_CHALLENGED)) 1928 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n", 1929 slave_dev->name, bond_dev->name); 1930 1931 vlan_vids_del_by_dev(slave_dev, bond_dev); 1932 1933 /* If the mode uses primary, then this case was handled above by 1934 * bond_change_active_slave(..., NULL) 1935 */ 1936 if (!bond_uses_primary(bond)) { 1937 /* unset promiscuity level from slave 1938 * NOTE: The NETDEV_CHANGEADDR call above may change the value 1939 * of the IFF_PROMISC flag in the bond_dev, but we need the 1940 * value of that flag before that change, as that was the value 1941 * when this slave was attached, so we cache at the start of the 1942 * function and use it here. Same goes for ALLMULTI below 1943 */ 1944 if (old_flags & IFF_PROMISC) 1945 dev_set_promiscuity(slave_dev, -1); 1946 1947 /* unset allmulti level from slave */ 1948 if (old_flags & IFF_ALLMULTI) 1949 dev_set_allmulti(slave_dev, -1); 1950 1951 bond_hw_addr_flush(bond_dev, slave_dev); 1952 } 1953 1954 slave_disable_netpoll(slave); 1955 1956 /* close slave before restoring its mac address */ 1957 dev_close(slave_dev); 1958 1959 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE || 1960 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1961 /* restore original ("permanent") mac address */ 1962 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr, 1963 slave->dev->addr_len); 1964 ss.ss_family = slave_dev->type; 1965 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss); 1966 } 1967 1968 dev_set_mtu(slave_dev, slave->original_mtu); 1969 1970 slave_dev->priv_flags &= ~IFF_BONDING; 1971 1972 bond_free_slave(slave); 1973 1974 return 0; 1975 } 1976 1977 /* A wrapper used because of ndo_del_link */ 1978 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 1979 { 1980 return __bond_release_one(bond_dev, slave_dev, false); 1981 } 1982 1983 /* First release a slave and then destroy the bond if no more slaves are left. 1984 * Must be under rtnl_lock when this function is called. 1985 */ 1986 static int bond_release_and_destroy(struct net_device *bond_dev, 1987 struct net_device *slave_dev) 1988 { 1989 struct bonding *bond = netdev_priv(bond_dev); 1990 int ret; 1991 1992 ret = bond_release(bond_dev, slave_dev); 1993 if (ret == 0 && !bond_has_slaves(bond)) { 1994 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 1995 netdev_info(bond_dev, "Destroying bond %s\n", 1996 bond_dev->name); 1997 bond_remove_proc_entry(bond); 1998 unregister_netdevice(bond_dev); 1999 } 2000 return ret; 2001 } 2002 2003 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info) 2004 { 2005 struct bonding *bond = netdev_priv(bond_dev); 2006 bond_fill_ifbond(bond, info); 2007 } 2008 2009 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 2010 { 2011 struct bonding *bond = netdev_priv(bond_dev); 2012 struct list_head *iter; 2013 int i = 0, res = -ENODEV; 2014 struct slave *slave; 2015 2016 bond_for_each_slave(bond, slave, iter) { 2017 if (i++ == (int)info->slave_id) { 2018 res = 0; 2019 bond_fill_ifslave(slave, info); 2020 break; 2021 } 2022 } 2023 2024 return res; 2025 } 2026 2027 /*-------------------------------- Monitoring -------------------------------*/ 2028 2029 /* called with rcu_read_lock() */ 2030 static int bond_miimon_inspect(struct bonding *bond) 2031 { 2032 int link_state, commit = 0; 2033 struct list_head *iter; 2034 struct slave *slave; 2035 bool ignore_updelay; 2036 2037 ignore_updelay = !rcu_dereference(bond->curr_active_slave); 2038 2039 bond_for_each_slave_rcu(bond, slave, iter) { 2040 slave->new_link = BOND_LINK_NOCHANGE; 2041 2042 link_state = bond_check_dev_link(bond, slave->dev, 0); 2043 2044 switch (slave->link) { 2045 case BOND_LINK_UP: 2046 if (link_state) 2047 continue; 2048 2049 bond_propose_link_state(slave, BOND_LINK_FAIL); 2050 slave->delay = bond->params.downdelay; 2051 if (slave->delay) { 2052 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n", 2053 (BOND_MODE(bond) == 2054 BOND_MODE_ACTIVEBACKUP) ? 2055 (bond_is_active_slave(slave) ? 2056 "active " : "backup ") : "", 2057 slave->dev->name, 2058 bond->params.downdelay * bond->params.miimon); 2059 } 2060 /*FALLTHRU*/ 2061 case BOND_LINK_FAIL: 2062 if (link_state) { 2063 /* recovered before downdelay expired */ 2064 bond_propose_link_state(slave, BOND_LINK_UP); 2065 slave->last_link_up = jiffies; 2066 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n", 2067 (bond->params.downdelay - slave->delay) * 2068 bond->params.miimon, 2069 slave->dev->name); 2070 commit++; 2071 continue; 2072 } 2073 2074 if (slave->delay <= 0) { 2075 slave->new_link = BOND_LINK_DOWN; 2076 commit++; 2077 continue; 2078 } 2079 2080 slave->delay--; 2081 break; 2082 2083 case BOND_LINK_DOWN: 2084 if (!link_state) 2085 continue; 2086 2087 bond_propose_link_state(slave, BOND_LINK_BACK); 2088 slave->delay = bond->params.updelay; 2089 2090 if (slave->delay) { 2091 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n", 2092 slave->dev->name, 2093 ignore_updelay ? 0 : 2094 bond->params.updelay * 2095 bond->params.miimon); 2096 } 2097 /*FALLTHRU*/ 2098 case BOND_LINK_BACK: 2099 if (!link_state) { 2100 bond_propose_link_state(slave, BOND_LINK_DOWN); 2101 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n", 2102 (bond->params.updelay - slave->delay) * 2103 bond->params.miimon, 2104 slave->dev->name); 2105 commit++; 2106 continue; 2107 } 2108 2109 if (ignore_updelay) 2110 slave->delay = 0; 2111 2112 if (slave->delay <= 0) { 2113 slave->new_link = BOND_LINK_UP; 2114 commit++; 2115 ignore_updelay = false; 2116 continue; 2117 } 2118 2119 slave->delay--; 2120 break; 2121 } 2122 } 2123 2124 return commit; 2125 } 2126 2127 static void bond_miimon_commit(struct bonding *bond) 2128 { 2129 struct list_head *iter; 2130 struct slave *slave, *primary; 2131 2132 bond_for_each_slave(bond, slave, iter) { 2133 switch (slave->new_link) { 2134 case BOND_LINK_NOCHANGE: 2135 continue; 2136 2137 case BOND_LINK_UP: 2138 if (bond_update_speed_duplex(slave)) { 2139 slave->link = BOND_LINK_DOWN; 2140 netdev_warn(bond->dev, 2141 "failed to get link speed/duplex for %s\n", 2142 slave->dev->name); 2143 continue; 2144 } 2145 bond_set_slave_link_state(slave, BOND_LINK_UP, 2146 BOND_SLAVE_NOTIFY_NOW); 2147 slave->last_link_up = jiffies; 2148 2149 primary = rtnl_dereference(bond->primary_slave); 2150 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 2151 /* prevent it from being the active one */ 2152 bond_set_backup_slave(slave); 2153 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2154 /* make it immediately active */ 2155 bond_set_active_slave(slave); 2156 } else if (slave != primary) { 2157 /* prevent it from being the active one */ 2158 bond_set_backup_slave(slave); 2159 } 2160 2161 netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n", 2162 slave->dev->name, 2163 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed, 2164 slave->duplex ? "full" : "half"); 2165 2166 /* notify ad that the link status has changed */ 2167 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2168 bond_3ad_handle_link_change(slave, BOND_LINK_UP); 2169 2170 if (bond_is_lb(bond)) 2171 bond_alb_handle_link_change(bond, slave, 2172 BOND_LINK_UP); 2173 2174 if (BOND_MODE(bond) == BOND_MODE_XOR) 2175 bond_update_slave_arr(bond, NULL); 2176 2177 if (!bond->curr_active_slave || slave == primary) 2178 goto do_failover; 2179 2180 continue; 2181 2182 case BOND_LINK_DOWN: 2183 if (slave->link_failure_count < UINT_MAX) 2184 slave->link_failure_count++; 2185 2186 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2187 BOND_SLAVE_NOTIFY_NOW); 2188 2189 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP || 2190 BOND_MODE(bond) == BOND_MODE_8023AD) 2191 bond_set_slave_inactive_flags(slave, 2192 BOND_SLAVE_NOTIFY_NOW); 2193 2194 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n", 2195 slave->dev->name); 2196 2197 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2198 bond_3ad_handle_link_change(slave, 2199 BOND_LINK_DOWN); 2200 2201 if (bond_is_lb(bond)) 2202 bond_alb_handle_link_change(bond, slave, 2203 BOND_LINK_DOWN); 2204 2205 if (BOND_MODE(bond) == BOND_MODE_XOR) 2206 bond_update_slave_arr(bond, NULL); 2207 2208 if (slave == rcu_access_pointer(bond->curr_active_slave)) 2209 goto do_failover; 2210 2211 continue; 2212 2213 default: 2214 netdev_err(bond->dev, "invalid new link %d on slave %s\n", 2215 slave->new_link, slave->dev->name); 2216 slave->new_link = BOND_LINK_NOCHANGE; 2217 2218 continue; 2219 } 2220 2221 do_failover: 2222 block_netpoll_tx(); 2223 bond_select_active_slave(bond); 2224 unblock_netpoll_tx(); 2225 } 2226 2227 bond_set_carrier(bond); 2228 } 2229 2230 /* bond_mii_monitor 2231 * 2232 * Really a wrapper that splits the mii monitor into two phases: an 2233 * inspection, then (if inspection indicates something needs to be done) 2234 * an acquisition of appropriate locks followed by a commit phase to 2235 * implement whatever link state changes are indicated. 2236 */ 2237 static void bond_mii_monitor(struct work_struct *work) 2238 { 2239 struct bonding *bond = container_of(work, struct bonding, 2240 mii_work.work); 2241 bool should_notify_peers = false; 2242 unsigned long delay; 2243 struct slave *slave; 2244 struct list_head *iter; 2245 2246 delay = msecs_to_jiffies(bond->params.miimon); 2247 2248 if (!bond_has_slaves(bond)) 2249 goto re_arm; 2250 2251 rcu_read_lock(); 2252 2253 should_notify_peers = bond_should_notify_peers(bond); 2254 2255 if (bond_miimon_inspect(bond)) { 2256 rcu_read_unlock(); 2257 2258 /* Race avoidance with bond_close cancel of workqueue */ 2259 if (!rtnl_trylock()) { 2260 delay = 1; 2261 should_notify_peers = false; 2262 goto re_arm; 2263 } 2264 2265 bond_for_each_slave(bond, slave, iter) { 2266 bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER); 2267 } 2268 bond_miimon_commit(bond); 2269 2270 rtnl_unlock(); /* might sleep, hold no other locks */ 2271 } else 2272 rcu_read_unlock(); 2273 2274 re_arm: 2275 if (bond->params.miimon) 2276 queue_delayed_work(bond->wq, &bond->mii_work, delay); 2277 2278 if (should_notify_peers) { 2279 if (!rtnl_trylock()) 2280 return; 2281 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); 2282 rtnl_unlock(); 2283 } 2284 } 2285 2286 static int bond_upper_dev_walk(struct net_device *upper, void *data) 2287 { 2288 __be32 ip = *((__be32 *)data); 2289 2290 return ip == bond_confirm_addr(upper, 0, ip); 2291 } 2292 2293 static bool bond_has_this_ip(struct bonding *bond, __be32 ip) 2294 { 2295 bool ret = false; 2296 2297 if (ip == bond_confirm_addr(bond->dev, 0, ip)) 2298 return true; 2299 2300 rcu_read_lock(); 2301 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &ip)) 2302 ret = true; 2303 rcu_read_unlock(); 2304 2305 return ret; 2306 } 2307 2308 /* We go to the (large) trouble of VLAN tagging ARP frames because 2309 * switches in VLAN mode (especially if ports are configured as 2310 * "native" to a VLAN) might not pass non-tagged frames. 2311 */ 2312 static void bond_arp_send(struct net_device *slave_dev, int arp_op, 2313 __be32 dest_ip, __be32 src_ip, 2314 struct bond_vlan_tag *tags) 2315 { 2316 struct sk_buff *skb; 2317 struct bond_vlan_tag *outer_tag = tags; 2318 2319 netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n", 2320 arp_op, slave_dev->name, &dest_ip, &src_ip); 2321 2322 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2323 NULL, slave_dev->dev_addr, NULL); 2324 2325 if (!skb) { 2326 net_err_ratelimited("ARP packet allocation failed\n"); 2327 return; 2328 } 2329 2330 if (!tags || tags->vlan_proto == VLAN_N_VID) 2331 goto xmit; 2332 2333 tags++; 2334 2335 /* Go through all the tags backwards and add them to the packet */ 2336 while (tags->vlan_proto != VLAN_N_VID) { 2337 if (!tags->vlan_id) { 2338 tags++; 2339 continue; 2340 } 2341 2342 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n", 2343 ntohs(outer_tag->vlan_proto), tags->vlan_id); 2344 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto, 2345 tags->vlan_id); 2346 if (!skb) { 2347 net_err_ratelimited("failed to insert inner VLAN tag\n"); 2348 return; 2349 } 2350 2351 tags++; 2352 } 2353 /* Set the outer tag */ 2354 if (outer_tag->vlan_id) { 2355 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n", 2356 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id); 2357 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto, 2358 outer_tag->vlan_id); 2359 } 2360 2361 xmit: 2362 arp_xmit(skb); 2363 } 2364 2365 /* Validate the device path between the @start_dev and the @end_dev. 2366 * The path is valid if the @end_dev is reachable through device 2367 * stacking. 2368 * When the path is validated, collect any vlan information in the 2369 * path. 2370 */ 2371 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev, 2372 struct net_device *end_dev, 2373 int level) 2374 { 2375 struct bond_vlan_tag *tags; 2376 struct net_device *upper; 2377 struct list_head *iter; 2378 2379 if (start_dev == end_dev) { 2380 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC); 2381 if (!tags) 2382 return ERR_PTR(-ENOMEM); 2383 tags[level].vlan_proto = VLAN_N_VID; 2384 return tags; 2385 } 2386 2387 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) { 2388 tags = bond_verify_device_path(upper, end_dev, level + 1); 2389 if (IS_ERR_OR_NULL(tags)) { 2390 if (IS_ERR(tags)) 2391 return tags; 2392 continue; 2393 } 2394 if (is_vlan_dev(upper)) { 2395 tags[level].vlan_proto = vlan_dev_vlan_proto(upper); 2396 tags[level].vlan_id = vlan_dev_vlan_id(upper); 2397 } 2398 2399 return tags; 2400 } 2401 2402 return NULL; 2403 } 2404 2405 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2406 { 2407 struct rtable *rt; 2408 struct bond_vlan_tag *tags; 2409 __be32 *targets = bond->params.arp_targets, addr; 2410 int i; 2411 2412 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) { 2413 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]); 2414 tags = NULL; 2415 2416 /* Find out through which dev should the packet go */ 2417 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 2418 RTO_ONLINK, 0); 2419 if (IS_ERR(rt)) { 2420 /* there's no route to target - try to send arp 2421 * probe to generate any traffic (arp_validate=0) 2422 */ 2423 if (bond->params.arp_validate) 2424 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n", 2425 bond->dev->name, 2426 &targets[i]); 2427 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2428 0, tags); 2429 continue; 2430 } 2431 2432 /* bond device itself */ 2433 if (rt->dst.dev == bond->dev) 2434 goto found; 2435 2436 rcu_read_lock(); 2437 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0); 2438 rcu_read_unlock(); 2439 2440 if (!IS_ERR_OR_NULL(tags)) 2441 goto found; 2442 2443 /* Not our device - skip */ 2444 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n", 2445 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL"); 2446 2447 ip_rt_put(rt); 2448 continue; 2449 2450 found: 2451 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0); 2452 ip_rt_put(rt); 2453 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2454 addr, tags); 2455 kfree(tags); 2456 } 2457 } 2458 2459 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 2460 { 2461 int i; 2462 2463 if (!sip || !bond_has_this_ip(bond, tip)) { 2464 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n", 2465 &sip, &tip); 2466 return; 2467 } 2468 2469 i = bond_get_targets_ip(bond->params.arp_targets, sip); 2470 if (i == -1) { 2471 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n", 2472 &sip); 2473 return; 2474 } 2475 slave->last_rx = jiffies; 2476 slave->target_last_arp_rx[i] = jiffies; 2477 } 2478 2479 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, 2480 struct slave *slave) 2481 { 2482 struct arphdr *arp = (struct arphdr *)skb->data; 2483 struct slave *curr_active_slave, *curr_arp_slave; 2484 unsigned char *arp_ptr; 2485 __be32 sip, tip; 2486 int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP); 2487 2488 if (!slave_do_arp_validate(bond, slave)) { 2489 if ((slave_do_arp_validate_only(bond) && is_arp) || 2490 !slave_do_arp_validate_only(bond)) 2491 slave->last_rx = jiffies; 2492 return RX_HANDLER_ANOTHER; 2493 } else if (!is_arp) { 2494 return RX_HANDLER_ANOTHER; 2495 } 2496 2497 alen = arp_hdr_len(bond->dev); 2498 2499 netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n", 2500 skb->dev->name); 2501 2502 if (alen > skb_headlen(skb)) { 2503 arp = kmalloc(alen, GFP_ATOMIC); 2504 if (!arp) 2505 goto out_unlock; 2506 if (skb_copy_bits(skb, 0, arp, alen) < 0) 2507 goto out_unlock; 2508 } 2509 2510 if (arp->ar_hln != bond->dev->addr_len || 2511 skb->pkt_type == PACKET_OTHERHOST || 2512 skb->pkt_type == PACKET_LOOPBACK || 2513 arp->ar_hrd != htons(ARPHRD_ETHER) || 2514 arp->ar_pro != htons(ETH_P_IP) || 2515 arp->ar_pln != 4) 2516 goto out_unlock; 2517 2518 arp_ptr = (unsigned char *)(arp + 1); 2519 arp_ptr += bond->dev->addr_len; 2520 memcpy(&sip, arp_ptr, 4); 2521 arp_ptr += 4 + bond->dev->addr_len; 2522 memcpy(&tip, arp_ptr, 4); 2523 2524 netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n", 2525 slave->dev->name, bond_slave_state(slave), 2526 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 2527 &sip, &tip); 2528 2529 curr_active_slave = rcu_dereference(bond->curr_active_slave); 2530 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 2531 2532 /* We 'trust' the received ARP enough to validate it if: 2533 * 2534 * (a) the slave receiving the ARP is active (which includes the 2535 * current ARP slave, if any), or 2536 * 2537 * (b) the receiving slave isn't active, but there is a currently 2538 * active slave and it received valid arp reply(s) after it became 2539 * the currently active slave, or 2540 * 2541 * (c) there is an ARP slave that sent an ARP during the prior ARP 2542 * interval, and we receive an ARP reply on any slave. We accept 2543 * these because switch FDB update delays may deliver the ARP 2544 * reply to a slave other than the sender of the ARP request. 2545 * 2546 * Note: for (b), backup slaves are receiving the broadcast ARP 2547 * request, not a reply. This request passes from the sending 2548 * slave through the L2 switch(es) to the receiving slave. Since 2549 * this is checking the request, sip/tip are swapped for 2550 * validation. 2551 * 2552 * This is done to avoid endless looping when we can't reach the 2553 * arp_ip_target and fool ourselves with our own arp requests. 2554 */ 2555 if (bond_is_active_slave(slave)) 2556 bond_validate_arp(bond, slave, sip, tip); 2557 else if (curr_active_slave && 2558 time_after(slave_last_rx(bond, curr_active_slave), 2559 curr_active_slave->last_link_up)) 2560 bond_validate_arp(bond, slave, tip, sip); 2561 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) && 2562 bond_time_in_interval(bond, 2563 dev_trans_start(curr_arp_slave->dev), 1)) 2564 bond_validate_arp(bond, slave, sip, tip); 2565 2566 out_unlock: 2567 if (arp != (struct arphdr *)skb->data) 2568 kfree(arp); 2569 return RX_HANDLER_ANOTHER; 2570 } 2571 2572 /* function to verify if we're in the arp_interval timeslice, returns true if 2573 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval + 2574 * arp_interval/2) . the arp_interval/2 is needed for really fast networks. 2575 */ 2576 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 2577 int mod) 2578 { 2579 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2580 2581 return time_in_range(jiffies, 2582 last_act - delta_in_ticks, 2583 last_act + mod * delta_in_ticks + delta_in_ticks/2); 2584 } 2585 2586 /* This function is called regularly to monitor each slave's link 2587 * ensuring that traffic is being sent and received when arp monitoring 2588 * is used in load-balancing mode. if the adapter has been dormant, then an 2589 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 2590 * arp monitoring in active backup mode. 2591 */ 2592 static void bond_loadbalance_arp_mon(struct bonding *bond) 2593 { 2594 struct slave *slave, *oldcurrent; 2595 struct list_head *iter; 2596 int do_failover = 0, slave_state_changed = 0; 2597 2598 if (!bond_has_slaves(bond)) 2599 goto re_arm; 2600 2601 rcu_read_lock(); 2602 2603 oldcurrent = rcu_dereference(bond->curr_active_slave); 2604 /* see if any of the previous devices are up now (i.e. they have 2605 * xmt and rcv traffic). the curr_active_slave does not come into 2606 * the picture unless it is null. also, slave->last_link_up is not 2607 * needed here because we send an arp on each slave and give a slave 2608 * as long as it needs to get the tx/rx within the delta. 2609 * TODO: what about up/down delay in arp mode? it wasn't here before 2610 * so it can wait 2611 */ 2612 bond_for_each_slave_rcu(bond, slave, iter) { 2613 unsigned long trans_start = dev_trans_start(slave->dev); 2614 2615 if (slave->link != BOND_LINK_UP) { 2616 if (bond_time_in_interval(bond, trans_start, 1) && 2617 bond_time_in_interval(bond, slave->last_rx, 1)) { 2618 2619 slave->link = BOND_LINK_UP; 2620 slave_state_changed = 1; 2621 2622 /* primary_slave has no meaning in round-robin 2623 * mode. the window of a slave being up and 2624 * curr_active_slave being null after enslaving 2625 * is closed. 2626 */ 2627 if (!oldcurrent) { 2628 netdev_info(bond->dev, "link status definitely up for interface %s\n", 2629 slave->dev->name); 2630 do_failover = 1; 2631 } else { 2632 netdev_info(bond->dev, "interface %s is now up\n", 2633 slave->dev->name); 2634 } 2635 } 2636 } else { 2637 /* slave->link == BOND_LINK_UP */ 2638 2639 /* not all switches will respond to an arp request 2640 * when the source ip is 0, so don't take the link down 2641 * if we don't know our ip yet 2642 */ 2643 if (!bond_time_in_interval(bond, trans_start, 2) || 2644 !bond_time_in_interval(bond, slave->last_rx, 2)) { 2645 2646 slave->link = BOND_LINK_DOWN; 2647 slave_state_changed = 1; 2648 2649 if (slave->link_failure_count < UINT_MAX) 2650 slave->link_failure_count++; 2651 2652 netdev_info(bond->dev, "interface %s is now down\n", 2653 slave->dev->name); 2654 2655 if (slave == oldcurrent) 2656 do_failover = 1; 2657 } 2658 } 2659 2660 /* note: if switch is in round-robin mode, all links 2661 * must tx arp to ensure all links rx an arp - otherwise 2662 * links may oscillate or not come up at all; if switch is 2663 * in something like xor mode, there is nothing we can 2664 * do - all replies will be rx'ed on same link causing slaves 2665 * to be unstable during low/no traffic periods 2666 */ 2667 if (bond_slave_is_up(slave)) 2668 bond_arp_send_all(bond, slave); 2669 } 2670 2671 rcu_read_unlock(); 2672 2673 if (do_failover || slave_state_changed) { 2674 if (!rtnl_trylock()) 2675 goto re_arm; 2676 2677 if (slave_state_changed) { 2678 bond_slave_state_change(bond); 2679 if (BOND_MODE(bond) == BOND_MODE_XOR) 2680 bond_update_slave_arr(bond, NULL); 2681 } 2682 if (do_failover) { 2683 block_netpoll_tx(); 2684 bond_select_active_slave(bond); 2685 unblock_netpoll_tx(); 2686 } 2687 rtnl_unlock(); 2688 } 2689 2690 re_arm: 2691 if (bond->params.arp_interval) 2692 queue_delayed_work(bond->wq, &bond->arp_work, 2693 msecs_to_jiffies(bond->params.arp_interval)); 2694 } 2695 2696 /* Called to inspect slaves for active-backup mode ARP monitor link state 2697 * changes. Sets new_link in slaves to specify what action should take 2698 * place for the slave. Returns 0 if no changes are found, >0 if changes 2699 * to link states must be committed. 2700 * 2701 * Called with rcu_read_lock held. 2702 */ 2703 static int bond_ab_arp_inspect(struct bonding *bond) 2704 { 2705 unsigned long trans_start, last_rx; 2706 struct list_head *iter; 2707 struct slave *slave; 2708 int commit = 0; 2709 2710 bond_for_each_slave_rcu(bond, slave, iter) { 2711 slave->new_link = BOND_LINK_NOCHANGE; 2712 last_rx = slave_last_rx(bond, slave); 2713 2714 if (slave->link != BOND_LINK_UP) { 2715 if (bond_time_in_interval(bond, last_rx, 1)) { 2716 slave->new_link = BOND_LINK_UP; 2717 commit++; 2718 } 2719 continue; 2720 } 2721 2722 /* Give slaves 2*delta after being enslaved or made 2723 * active. This avoids bouncing, as the last receive 2724 * times need a full ARP monitor cycle to be updated. 2725 */ 2726 if (bond_time_in_interval(bond, slave->last_link_up, 2)) 2727 continue; 2728 2729 /* Backup slave is down if: 2730 * - No current_arp_slave AND 2731 * - more than 3*delta since last receive AND 2732 * - the bond has an IP address 2733 * 2734 * Note: a non-null current_arp_slave indicates 2735 * the curr_active_slave went down and we are 2736 * searching for a new one; under this condition 2737 * we only take the curr_active_slave down - this 2738 * gives each slave a chance to tx/rx traffic 2739 * before being taken out 2740 */ 2741 if (!bond_is_active_slave(slave) && 2742 !rcu_access_pointer(bond->current_arp_slave) && 2743 !bond_time_in_interval(bond, last_rx, 3)) { 2744 slave->new_link = BOND_LINK_DOWN; 2745 commit++; 2746 } 2747 2748 /* Active slave is down if: 2749 * - more than 2*delta since transmitting OR 2750 * - (more than 2*delta since receive AND 2751 * the bond has an IP address) 2752 */ 2753 trans_start = dev_trans_start(slave->dev); 2754 if (bond_is_active_slave(slave) && 2755 (!bond_time_in_interval(bond, trans_start, 2) || 2756 !bond_time_in_interval(bond, last_rx, 2))) { 2757 slave->new_link = BOND_LINK_DOWN; 2758 commit++; 2759 } 2760 } 2761 2762 return commit; 2763 } 2764 2765 /* Called to commit link state changes noted by inspection step of 2766 * active-backup mode ARP monitor. 2767 * 2768 * Called with RTNL hold. 2769 */ 2770 static void bond_ab_arp_commit(struct bonding *bond) 2771 { 2772 unsigned long trans_start; 2773 struct list_head *iter; 2774 struct slave *slave; 2775 2776 bond_for_each_slave(bond, slave, iter) { 2777 switch (slave->new_link) { 2778 case BOND_LINK_NOCHANGE: 2779 continue; 2780 2781 case BOND_LINK_UP: 2782 trans_start = dev_trans_start(slave->dev); 2783 if (rtnl_dereference(bond->curr_active_slave) != slave || 2784 (!rtnl_dereference(bond->curr_active_slave) && 2785 bond_time_in_interval(bond, trans_start, 1))) { 2786 struct slave *current_arp_slave; 2787 2788 current_arp_slave = rtnl_dereference(bond->current_arp_slave); 2789 bond_set_slave_link_state(slave, BOND_LINK_UP, 2790 BOND_SLAVE_NOTIFY_NOW); 2791 if (current_arp_slave) { 2792 bond_set_slave_inactive_flags( 2793 current_arp_slave, 2794 BOND_SLAVE_NOTIFY_NOW); 2795 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2796 } 2797 2798 netdev_info(bond->dev, "link status definitely up for interface %s\n", 2799 slave->dev->name); 2800 2801 if (!rtnl_dereference(bond->curr_active_slave) || 2802 slave == rtnl_dereference(bond->primary_slave)) 2803 goto do_failover; 2804 2805 } 2806 2807 continue; 2808 2809 case BOND_LINK_DOWN: 2810 if (slave->link_failure_count < UINT_MAX) 2811 slave->link_failure_count++; 2812 2813 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2814 BOND_SLAVE_NOTIFY_NOW); 2815 bond_set_slave_inactive_flags(slave, 2816 BOND_SLAVE_NOTIFY_NOW); 2817 2818 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n", 2819 slave->dev->name); 2820 2821 if (slave == rtnl_dereference(bond->curr_active_slave)) { 2822 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2823 goto do_failover; 2824 } 2825 2826 continue; 2827 2828 default: 2829 netdev_err(bond->dev, "impossible: new_link %d on slave %s\n", 2830 slave->new_link, slave->dev->name); 2831 continue; 2832 } 2833 2834 do_failover: 2835 block_netpoll_tx(); 2836 bond_select_active_slave(bond); 2837 unblock_netpoll_tx(); 2838 } 2839 2840 bond_set_carrier(bond); 2841 } 2842 2843 /* Send ARP probes for active-backup mode ARP monitor. 2844 * 2845 * Called with rcu_read_lock held. 2846 */ 2847 static bool bond_ab_arp_probe(struct bonding *bond) 2848 { 2849 struct slave *slave, *before = NULL, *new_slave = NULL, 2850 *curr_arp_slave = rcu_dereference(bond->current_arp_slave), 2851 *curr_active_slave = rcu_dereference(bond->curr_active_slave); 2852 struct list_head *iter; 2853 bool found = false; 2854 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; 2855 2856 if (curr_arp_slave && curr_active_slave) 2857 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n", 2858 curr_arp_slave->dev->name, 2859 curr_active_slave->dev->name); 2860 2861 if (curr_active_slave) { 2862 bond_arp_send_all(bond, curr_active_slave); 2863 return should_notify_rtnl; 2864 } 2865 2866 /* if we don't have a curr_active_slave, search for the next available 2867 * backup slave from the current_arp_slave and make it the candidate 2868 * for becoming the curr_active_slave 2869 */ 2870 2871 if (!curr_arp_slave) { 2872 curr_arp_slave = bond_first_slave_rcu(bond); 2873 if (!curr_arp_slave) 2874 return should_notify_rtnl; 2875 } 2876 2877 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER); 2878 2879 bond_for_each_slave_rcu(bond, slave, iter) { 2880 if (!found && !before && bond_slave_is_up(slave)) 2881 before = slave; 2882 2883 if (found && !new_slave && bond_slave_is_up(slave)) 2884 new_slave = slave; 2885 /* if the link state is up at this point, we 2886 * mark it down - this can happen if we have 2887 * simultaneous link failures and 2888 * reselect_active_interface doesn't make this 2889 * one the current slave so it is still marked 2890 * up when it is actually down 2891 */ 2892 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 2893 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2894 BOND_SLAVE_NOTIFY_LATER); 2895 if (slave->link_failure_count < UINT_MAX) 2896 slave->link_failure_count++; 2897 2898 bond_set_slave_inactive_flags(slave, 2899 BOND_SLAVE_NOTIFY_LATER); 2900 2901 netdev_info(bond->dev, "backup interface %s is now down\n", 2902 slave->dev->name); 2903 } 2904 if (slave == curr_arp_slave) 2905 found = true; 2906 } 2907 2908 if (!new_slave && before) 2909 new_slave = before; 2910 2911 if (!new_slave) 2912 goto check_state; 2913 2914 bond_set_slave_link_state(new_slave, BOND_LINK_BACK, 2915 BOND_SLAVE_NOTIFY_LATER); 2916 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER); 2917 bond_arp_send_all(bond, new_slave); 2918 new_slave->last_link_up = jiffies; 2919 rcu_assign_pointer(bond->current_arp_slave, new_slave); 2920 2921 check_state: 2922 bond_for_each_slave_rcu(bond, slave, iter) { 2923 if (slave->should_notify || slave->should_notify_link) { 2924 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; 2925 break; 2926 } 2927 } 2928 return should_notify_rtnl; 2929 } 2930 2931 static void bond_activebackup_arp_mon(struct bonding *bond) 2932 { 2933 bool should_notify_peers = false; 2934 bool should_notify_rtnl = false; 2935 int delta_in_ticks; 2936 2937 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2938 2939 if (!bond_has_slaves(bond)) 2940 goto re_arm; 2941 2942 rcu_read_lock(); 2943 2944 should_notify_peers = bond_should_notify_peers(bond); 2945 2946 if (bond_ab_arp_inspect(bond)) { 2947 rcu_read_unlock(); 2948 2949 /* Race avoidance with bond_close flush of workqueue */ 2950 if (!rtnl_trylock()) { 2951 delta_in_ticks = 1; 2952 should_notify_peers = false; 2953 goto re_arm; 2954 } 2955 2956 bond_ab_arp_commit(bond); 2957 2958 rtnl_unlock(); 2959 rcu_read_lock(); 2960 } 2961 2962 should_notify_rtnl = bond_ab_arp_probe(bond); 2963 rcu_read_unlock(); 2964 2965 re_arm: 2966 if (bond->params.arp_interval) 2967 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 2968 2969 if (should_notify_peers || should_notify_rtnl) { 2970 if (!rtnl_trylock()) 2971 return; 2972 2973 if (should_notify_peers) 2974 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 2975 bond->dev); 2976 if (should_notify_rtnl) { 2977 bond_slave_state_notify(bond); 2978 bond_slave_link_notify(bond); 2979 } 2980 2981 rtnl_unlock(); 2982 } 2983 } 2984 2985 static void bond_arp_monitor(struct work_struct *work) 2986 { 2987 struct bonding *bond = container_of(work, struct bonding, 2988 arp_work.work); 2989 2990 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 2991 bond_activebackup_arp_mon(bond); 2992 else 2993 bond_loadbalance_arp_mon(bond); 2994 } 2995 2996 /*-------------------------- netdev event handling --------------------------*/ 2997 2998 /* Change device name */ 2999 static int bond_event_changename(struct bonding *bond) 3000 { 3001 bond_remove_proc_entry(bond); 3002 bond_create_proc_entry(bond); 3003 3004 bond_debug_reregister(bond); 3005 3006 return NOTIFY_DONE; 3007 } 3008 3009 static int bond_master_netdev_event(unsigned long event, 3010 struct net_device *bond_dev) 3011 { 3012 struct bonding *event_bond = netdev_priv(bond_dev); 3013 3014 switch (event) { 3015 case NETDEV_CHANGENAME: 3016 return bond_event_changename(event_bond); 3017 case NETDEV_UNREGISTER: 3018 bond_remove_proc_entry(event_bond); 3019 break; 3020 case NETDEV_REGISTER: 3021 bond_create_proc_entry(event_bond); 3022 break; 3023 case NETDEV_NOTIFY_PEERS: 3024 if (event_bond->send_peer_notif) 3025 event_bond->send_peer_notif--; 3026 break; 3027 default: 3028 break; 3029 } 3030 3031 return NOTIFY_DONE; 3032 } 3033 3034 static int bond_slave_netdev_event(unsigned long event, 3035 struct net_device *slave_dev) 3036 { 3037 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary; 3038 struct bonding *bond; 3039 struct net_device *bond_dev; 3040 3041 /* A netdev event can be generated while enslaving a device 3042 * before netdev_rx_handler_register is called in which case 3043 * slave will be NULL 3044 */ 3045 if (!slave) 3046 return NOTIFY_DONE; 3047 bond_dev = slave->bond->dev; 3048 bond = slave->bond; 3049 primary = rtnl_dereference(bond->primary_slave); 3050 3051 switch (event) { 3052 case NETDEV_UNREGISTER: 3053 if (bond_dev->type != ARPHRD_ETHER) 3054 bond_release_and_destroy(bond_dev, slave_dev); 3055 else 3056 bond_release(bond_dev, slave_dev); 3057 break; 3058 case NETDEV_UP: 3059 case NETDEV_CHANGE: 3060 bond_update_speed_duplex(slave); 3061 if (BOND_MODE(bond) == BOND_MODE_8023AD) 3062 bond_3ad_adapter_speed_duplex_changed(slave); 3063 /* Fallthrough */ 3064 case NETDEV_DOWN: 3065 /* Refresh slave-array if applicable! 3066 * If the setup does not use miimon or arpmon (mode-specific!), 3067 * then these events will not cause the slave-array to be 3068 * refreshed. This will cause xmit to use a slave that is not 3069 * usable. Avoid such situation by refeshing the array at these 3070 * events. If these (miimon/arpmon) parameters are configured 3071 * then array gets refreshed twice and that should be fine! 3072 */ 3073 if (bond_mode_uses_xmit_hash(bond)) 3074 bond_update_slave_arr(bond, NULL); 3075 break; 3076 case NETDEV_CHANGEMTU: 3077 /* TODO: Should slaves be allowed to 3078 * independently alter their MTU? For 3079 * an active-backup bond, slaves need 3080 * not be the same type of device, so 3081 * MTUs may vary. For other modes, 3082 * slaves arguably should have the 3083 * same MTUs. To do this, we'd need to 3084 * take over the slave's change_mtu 3085 * function for the duration of their 3086 * servitude. 3087 */ 3088 break; 3089 case NETDEV_CHANGENAME: 3090 /* we don't care if we don't have primary set */ 3091 if (!bond_uses_primary(bond) || 3092 !bond->params.primary[0]) 3093 break; 3094 3095 if (slave == primary) { 3096 /* slave's name changed - he's no longer primary */ 3097 RCU_INIT_POINTER(bond->primary_slave, NULL); 3098 } else if (!strcmp(slave_dev->name, bond->params.primary)) { 3099 /* we have a new primary slave */ 3100 rcu_assign_pointer(bond->primary_slave, slave); 3101 } else { /* we didn't change primary - exit */ 3102 break; 3103 } 3104 3105 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n", 3106 primary ? slave_dev->name : "none"); 3107 3108 block_netpoll_tx(); 3109 bond_select_active_slave(bond); 3110 unblock_netpoll_tx(); 3111 break; 3112 case NETDEV_FEAT_CHANGE: 3113 bond_compute_features(bond); 3114 break; 3115 case NETDEV_RESEND_IGMP: 3116 /* Propagate to master device */ 3117 call_netdevice_notifiers(event, slave->bond->dev); 3118 break; 3119 default: 3120 break; 3121 } 3122 3123 return NOTIFY_DONE; 3124 } 3125 3126 /* bond_netdev_event: handle netdev notifier chain events. 3127 * 3128 * This function receives events for the netdev chain. The caller (an 3129 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 3130 * locks for us to safely manipulate the slave devices (RTNL lock, 3131 * dev_probe_lock). 3132 */ 3133 static int bond_netdev_event(struct notifier_block *this, 3134 unsigned long event, void *ptr) 3135 { 3136 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 3137 3138 netdev_dbg(event_dev, "event: %lx\n", event); 3139 3140 if (!(event_dev->priv_flags & IFF_BONDING)) 3141 return NOTIFY_DONE; 3142 3143 if (event_dev->flags & IFF_MASTER) { 3144 netdev_dbg(event_dev, "IFF_MASTER\n"); 3145 return bond_master_netdev_event(event, event_dev); 3146 } 3147 3148 if (event_dev->flags & IFF_SLAVE) { 3149 netdev_dbg(event_dev, "IFF_SLAVE\n"); 3150 return bond_slave_netdev_event(event, event_dev); 3151 } 3152 3153 return NOTIFY_DONE; 3154 } 3155 3156 static struct notifier_block bond_netdev_notifier = { 3157 .notifier_call = bond_netdev_event, 3158 }; 3159 3160 /*---------------------------- Hashing Policies -----------------------------*/ 3161 3162 /* L2 hash helper */ 3163 static inline u32 bond_eth_hash(struct sk_buff *skb) 3164 { 3165 struct ethhdr *ep, hdr_tmp; 3166 3167 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp); 3168 if (ep) 3169 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto; 3170 return 0; 3171 } 3172 3173 /* Extract the appropriate headers based on bond's xmit policy */ 3174 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, 3175 struct flow_keys *fk) 3176 { 3177 const struct ipv6hdr *iph6; 3178 const struct iphdr *iph; 3179 int noff, proto = -1; 3180 3181 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23) 3182 return skb_flow_dissect_flow_keys(skb, fk, 0); 3183 3184 fk->ports.ports = 0; 3185 noff = skb_network_offset(skb); 3186 if (skb->protocol == htons(ETH_P_IP)) { 3187 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph)))) 3188 return false; 3189 iph = ip_hdr(skb); 3190 iph_to_flow_copy_v4addrs(fk, iph); 3191 noff += iph->ihl << 2; 3192 if (!ip_is_fragment(iph)) 3193 proto = iph->protocol; 3194 } else if (skb->protocol == htons(ETH_P_IPV6)) { 3195 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6)))) 3196 return false; 3197 iph6 = ipv6_hdr(skb); 3198 iph_to_flow_copy_v6addrs(fk, iph6); 3199 noff += sizeof(*iph6); 3200 proto = iph6->nexthdr; 3201 } else { 3202 return false; 3203 } 3204 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0) 3205 fk->ports.ports = skb_flow_get_ports(skb, noff, proto); 3206 3207 return true; 3208 } 3209 3210 /** 3211 * bond_xmit_hash - generate a hash value based on the xmit policy 3212 * @bond: bonding device 3213 * @skb: buffer to use for headers 3214 * 3215 * This function will extract the necessary headers from the skb buffer and use 3216 * them to generate a hash based on the xmit_policy set in the bonding device 3217 */ 3218 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb) 3219 { 3220 struct flow_keys flow; 3221 u32 hash; 3222 3223 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 && 3224 skb->l4_hash) 3225 return skb->hash; 3226 3227 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 || 3228 !bond_flow_dissect(bond, skb, &flow)) 3229 return bond_eth_hash(skb); 3230 3231 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 || 3232 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) 3233 hash = bond_eth_hash(skb); 3234 else 3235 hash = (__force u32)flow.ports.ports; 3236 hash ^= (__force u32)flow_get_u32_dst(&flow) ^ 3237 (__force u32)flow_get_u32_src(&flow); 3238 hash ^= (hash >> 16); 3239 hash ^= (hash >> 8); 3240 3241 return hash; 3242 } 3243 3244 /*-------------------------- Device entry points ----------------------------*/ 3245 3246 void bond_work_init_all(struct bonding *bond) 3247 { 3248 INIT_DELAYED_WORK(&bond->mcast_work, 3249 bond_resend_igmp_join_requests_delayed); 3250 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 3251 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 3252 INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor); 3253 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 3254 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler); 3255 } 3256 3257 static void bond_work_cancel_all(struct bonding *bond) 3258 { 3259 cancel_delayed_work_sync(&bond->mii_work); 3260 cancel_delayed_work_sync(&bond->arp_work); 3261 cancel_delayed_work_sync(&bond->alb_work); 3262 cancel_delayed_work_sync(&bond->ad_work); 3263 cancel_delayed_work_sync(&bond->mcast_work); 3264 cancel_delayed_work_sync(&bond->slave_arr_work); 3265 } 3266 3267 static int bond_open(struct net_device *bond_dev) 3268 { 3269 struct bonding *bond = netdev_priv(bond_dev); 3270 struct list_head *iter; 3271 struct slave *slave; 3272 3273 /* reset slave->backup and slave->inactive */ 3274 if (bond_has_slaves(bond)) { 3275 bond_for_each_slave(bond, slave, iter) { 3276 if (bond_uses_primary(bond) && 3277 slave != rcu_access_pointer(bond->curr_active_slave)) { 3278 bond_set_slave_inactive_flags(slave, 3279 BOND_SLAVE_NOTIFY_NOW); 3280 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) { 3281 bond_set_slave_active_flags(slave, 3282 BOND_SLAVE_NOTIFY_NOW); 3283 } 3284 } 3285 } 3286 3287 if (bond_is_lb(bond)) { 3288 /* bond_alb_initialize must be called before the timer 3289 * is started. 3290 */ 3291 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB))) 3292 return -ENOMEM; 3293 if (bond->params.tlb_dynamic_lb) 3294 queue_delayed_work(bond->wq, &bond->alb_work, 0); 3295 } 3296 3297 if (bond->params.miimon) /* link check interval, in milliseconds. */ 3298 queue_delayed_work(bond->wq, &bond->mii_work, 0); 3299 3300 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 3301 queue_delayed_work(bond->wq, &bond->arp_work, 0); 3302 bond->recv_probe = bond_arp_rcv; 3303 } 3304 3305 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3306 queue_delayed_work(bond->wq, &bond->ad_work, 0); 3307 /* register to receive LACPDUs */ 3308 bond->recv_probe = bond_3ad_lacpdu_recv; 3309 bond_3ad_initiate_agg_selection(bond, 1); 3310 } 3311 3312 if (bond_mode_uses_xmit_hash(bond)) 3313 bond_update_slave_arr(bond, NULL); 3314 3315 return 0; 3316 } 3317 3318 static int bond_close(struct net_device *bond_dev) 3319 { 3320 struct bonding *bond = netdev_priv(bond_dev); 3321 3322 bond_work_cancel_all(bond); 3323 bond->send_peer_notif = 0; 3324 if (bond_is_lb(bond)) 3325 bond_alb_deinitialize(bond); 3326 bond->recv_probe = NULL; 3327 3328 return 0; 3329 } 3330 3331 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but 3332 * that some drivers can provide 32bit values only. 3333 */ 3334 static void bond_fold_stats(struct rtnl_link_stats64 *_res, 3335 const struct rtnl_link_stats64 *_new, 3336 const struct rtnl_link_stats64 *_old) 3337 { 3338 const u64 *new = (const u64 *)_new; 3339 const u64 *old = (const u64 *)_old; 3340 u64 *res = (u64 *)_res; 3341 int i; 3342 3343 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) { 3344 u64 nv = new[i]; 3345 u64 ov = old[i]; 3346 s64 delta = nv - ov; 3347 3348 /* detects if this particular field is 32bit only */ 3349 if (((nv | ov) >> 32) == 0) 3350 delta = (s64)(s32)((u32)nv - (u32)ov); 3351 3352 /* filter anomalies, some drivers reset their stats 3353 * at down/up events. 3354 */ 3355 if (delta > 0) 3356 res[i] += delta; 3357 } 3358 } 3359 3360 static void bond_get_stats(struct net_device *bond_dev, 3361 struct rtnl_link_stats64 *stats) 3362 { 3363 struct bonding *bond = netdev_priv(bond_dev); 3364 struct rtnl_link_stats64 temp; 3365 struct list_head *iter; 3366 struct slave *slave; 3367 3368 spin_lock(&bond->stats_lock); 3369 memcpy(stats, &bond->bond_stats, sizeof(*stats)); 3370 3371 rcu_read_lock(); 3372 bond_for_each_slave_rcu(bond, slave, iter) { 3373 const struct rtnl_link_stats64 *new = 3374 dev_get_stats(slave->dev, &temp); 3375 3376 bond_fold_stats(stats, new, &slave->slave_stats); 3377 3378 /* save off the slave stats for the next run */ 3379 memcpy(&slave->slave_stats, new, sizeof(*new)); 3380 } 3381 rcu_read_unlock(); 3382 3383 memcpy(&bond->bond_stats, stats, sizeof(*stats)); 3384 spin_unlock(&bond->stats_lock); 3385 } 3386 3387 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 3388 { 3389 struct bonding *bond = netdev_priv(bond_dev); 3390 struct net_device *slave_dev = NULL; 3391 struct ifbond k_binfo; 3392 struct ifbond __user *u_binfo = NULL; 3393 struct ifslave k_sinfo; 3394 struct ifslave __user *u_sinfo = NULL; 3395 struct mii_ioctl_data *mii = NULL; 3396 struct bond_opt_value newval; 3397 struct net *net; 3398 int res = 0; 3399 3400 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd); 3401 3402 switch (cmd) { 3403 case SIOCGMIIPHY: 3404 mii = if_mii(ifr); 3405 if (!mii) 3406 return -EINVAL; 3407 3408 mii->phy_id = 0; 3409 /* Fall Through */ 3410 case SIOCGMIIREG: 3411 /* We do this again just in case we were called by SIOCGMIIREG 3412 * instead of SIOCGMIIPHY. 3413 */ 3414 mii = if_mii(ifr); 3415 if (!mii) 3416 return -EINVAL; 3417 3418 if (mii->reg_num == 1) { 3419 mii->val_out = 0; 3420 if (netif_carrier_ok(bond->dev)) 3421 mii->val_out = BMSR_LSTATUS; 3422 } 3423 3424 return 0; 3425 case BOND_INFO_QUERY_OLD: 3426 case SIOCBONDINFOQUERY: 3427 u_binfo = (struct ifbond __user *)ifr->ifr_data; 3428 3429 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 3430 return -EFAULT; 3431 3432 bond_info_query(bond_dev, &k_binfo); 3433 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 3434 return -EFAULT; 3435 3436 return 0; 3437 case BOND_SLAVE_INFO_QUERY_OLD: 3438 case SIOCBONDSLAVEINFOQUERY: 3439 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 3440 3441 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 3442 return -EFAULT; 3443 3444 res = bond_slave_info_query(bond_dev, &k_sinfo); 3445 if (res == 0 && 3446 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 3447 return -EFAULT; 3448 3449 return res; 3450 default: 3451 break; 3452 } 3453 3454 net = dev_net(bond_dev); 3455 3456 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3457 return -EPERM; 3458 3459 slave_dev = __dev_get_by_name(net, ifr->ifr_slave); 3460 3461 netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev); 3462 3463 if (!slave_dev) 3464 return -ENODEV; 3465 3466 netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name); 3467 switch (cmd) { 3468 case BOND_ENSLAVE_OLD: 3469 case SIOCBONDENSLAVE: 3470 res = bond_enslave(bond_dev, slave_dev); 3471 break; 3472 case BOND_RELEASE_OLD: 3473 case SIOCBONDRELEASE: 3474 res = bond_release(bond_dev, slave_dev); 3475 break; 3476 case BOND_SETHWADDR_OLD: 3477 case SIOCBONDSETHWADDR: 3478 bond_set_dev_addr(bond_dev, slave_dev); 3479 res = 0; 3480 break; 3481 case BOND_CHANGE_ACTIVE_OLD: 3482 case SIOCBONDCHANGEACTIVE: 3483 bond_opt_initstr(&newval, slave_dev->name); 3484 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval); 3485 break; 3486 default: 3487 res = -EOPNOTSUPP; 3488 } 3489 3490 return res; 3491 } 3492 3493 static void bond_change_rx_flags(struct net_device *bond_dev, int change) 3494 { 3495 struct bonding *bond = netdev_priv(bond_dev); 3496 3497 if (change & IFF_PROMISC) 3498 bond_set_promiscuity(bond, 3499 bond_dev->flags & IFF_PROMISC ? 1 : -1); 3500 3501 if (change & IFF_ALLMULTI) 3502 bond_set_allmulti(bond, 3503 bond_dev->flags & IFF_ALLMULTI ? 1 : -1); 3504 } 3505 3506 static void bond_set_rx_mode(struct net_device *bond_dev) 3507 { 3508 struct bonding *bond = netdev_priv(bond_dev); 3509 struct list_head *iter; 3510 struct slave *slave; 3511 3512 rcu_read_lock(); 3513 if (bond_uses_primary(bond)) { 3514 slave = rcu_dereference(bond->curr_active_slave); 3515 if (slave) { 3516 dev_uc_sync(slave->dev, bond_dev); 3517 dev_mc_sync(slave->dev, bond_dev); 3518 } 3519 } else { 3520 bond_for_each_slave_rcu(bond, slave, iter) { 3521 dev_uc_sync_multiple(slave->dev, bond_dev); 3522 dev_mc_sync_multiple(slave->dev, bond_dev); 3523 } 3524 } 3525 rcu_read_unlock(); 3526 } 3527 3528 static int bond_neigh_init(struct neighbour *n) 3529 { 3530 struct bonding *bond = netdev_priv(n->dev); 3531 const struct net_device_ops *slave_ops; 3532 struct neigh_parms parms; 3533 struct slave *slave; 3534 int ret; 3535 3536 slave = bond_first_slave(bond); 3537 if (!slave) 3538 return 0; 3539 slave_ops = slave->dev->netdev_ops; 3540 if (!slave_ops->ndo_neigh_setup) 3541 return 0; 3542 3543 parms.neigh_setup = NULL; 3544 parms.neigh_cleanup = NULL; 3545 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); 3546 if (ret) 3547 return ret; 3548 3549 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called 3550 * after the last slave has been detached. Assumes that all slaves 3551 * utilize the same neigh_cleanup (true at this writing as only user 3552 * is ipoib). 3553 */ 3554 n->parms->neigh_cleanup = parms.neigh_cleanup; 3555 3556 if (!parms.neigh_setup) 3557 return 0; 3558 3559 return parms.neigh_setup(n); 3560 } 3561 3562 /* The bonding ndo_neigh_setup is called at init time beofre any 3563 * slave exists. So we must declare proxy setup function which will 3564 * be used at run time to resolve the actual slave neigh param setup. 3565 * 3566 * It's also called by master devices (such as vlans) to setup their 3567 * underlying devices. In that case - do nothing, we're already set up from 3568 * our init. 3569 */ 3570 static int bond_neigh_setup(struct net_device *dev, 3571 struct neigh_parms *parms) 3572 { 3573 /* modify only our neigh_parms */ 3574 if (parms->dev == dev) 3575 parms->neigh_setup = bond_neigh_init; 3576 3577 return 0; 3578 } 3579 3580 /* Change the MTU of all of a master's slaves to match the master */ 3581 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 3582 { 3583 struct bonding *bond = netdev_priv(bond_dev); 3584 struct slave *slave, *rollback_slave; 3585 struct list_head *iter; 3586 int res = 0; 3587 3588 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu); 3589 3590 bond_for_each_slave(bond, slave, iter) { 3591 netdev_dbg(bond_dev, "s %p c_m %p\n", 3592 slave, slave->dev->netdev_ops->ndo_change_mtu); 3593 3594 res = dev_set_mtu(slave->dev, new_mtu); 3595 3596 if (res) { 3597 /* If we failed to set the slave's mtu to the new value 3598 * we must abort the operation even in ACTIVE_BACKUP 3599 * mode, because if we allow the backup slaves to have 3600 * different mtu values than the active slave we'll 3601 * need to change their mtu when doing a failover. That 3602 * means changing their mtu from timer context, which 3603 * is probably not a good idea. 3604 */ 3605 netdev_dbg(bond_dev, "err %d %s\n", res, 3606 slave->dev->name); 3607 goto unwind; 3608 } 3609 } 3610 3611 bond_dev->mtu = new_mtu; 3612 3613 return 0; 3614 3615 unwind: 3616 /* unwind from head to the slave that failed */ 3617 bond_for_each_slave(bond, rollback_slave, iter) { 3618 int tmp_res; 3619 3620 if (rollback_slave == slave) 3621 break; 3622 3623 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu); 3624 if (tmp_res) { 3625 netdev_dbg(bond_dev, "unwind err %d dev %s\n", 3626 tmp_res, rollback_slave->dev->name); 3627 } 3628 } 3629 3630 return res; 3631 } 3632 3633 /* Change HW address 3634 * 3635 * Note that many devices must be down to change the HW address, and 3636 * downing the master releases all slaves. We can make bonds full of 3637 * bonding devices to test this, however. 3638 */ 3639 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 3640 { 3641 struct bonding *bond = netdev_priv(bond_dev); 3642 struct slave *slave, *rollback_slave; 3643 struct sockaddr_storage *ss = addr, tmp_ss; 3644 struct list_head *iter; 3645 int res = 0; 3646 3647 if (BOND_MODE(bond) == BOND_MODE_ALB) 3648 return bond_alb_set_mac_address(bond_dev, addr); 3649 3650 3651 netdev_dbg(bond_dev, "bond=%p\n", bond); 3652 3653 /* If fail_over_mac is enabled, do nothing and return success. 3654 * Returning an error causes ifenslave to fail. 3655 */ 3656 if (bond->params.fail_over_mac && 3657 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3658 return 0; 3659 3660 if (!is_valid_ether_addr(ss->__data)) 3661 return -EADDRNOTAVAIL; 3662 3663 bond_for_each_slave(bond, slave, iter) { 3664 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name); 3665 res = dev_set_mac_address(slave->dev, addr); 3666 if (res) { 3667 /* TODO: consider downing the slave 3668 * and retry ? 3669 * User should expect communications 3670 * breakage anyway until ARP finish 3671 * updating, so... 3672 */ 3673 netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name); 3674 goto unwind; 3675 } 3676 } 3677 3678 /* success */ 3679 memcpy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len); 3680 return 0; 3681 3682 unwind: 3683 memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 3684 tmp_ss.ss_family = bond_dev->type; 3685 3686 /* unwind from head to the slave that failed */ 3687 bond_for_each_slave(bond, rollback_slave, iter) { 3688 int tmp_res; 3689 3690 if (rollback_slave == slave) 3691 break; 3692 3693 tmp_res = dev_set_mac_address(rollback_slave->dev, 3694 (struct sockaddr *)&tmp_ss); 3695 if (tmp_res) { 3696 netdev_dbg(bond_dev, "unwind err %d dev %s\n", 3697 tmp_res, rollback_slave->dev->name); 3698 } 3699 } 3700 3701 return res; 3702 } 3703 3704 /** 3705 * bond_xmit_slave_id - transmit skb through slave with slave_id 3706 * @bond: bonding device that is transmitting 3707 * @skb: buffer to transmit 3708 * @slave_id: slave id up to slave_cnt-1 through which to transmit 3709 * 3710 * This function tries to transmit through slave with slave_id but in case 3711 * it fails, it tries to find the first available slave for transmission. 3712 * The skb is consumed in all cases, thus the function is void. 3713 */ 3714 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id) 3715 { 3716 struct list_head *iter; 3717 struct slave *slave; 3718 int i = slave_id; 3719 3720 /* Here we start from the slave with slave_id */ 3721 bond_for_each_slave_rcu(bond, slave, iter) { 3722 if (--i < 0) { 3723 if (bond_slave_can_tx(slave)) { 3724 bond_dev_queue_xmit(bond, skb, slave->dev); 3725 return; 3726 } 3727 } 3728 } 3729 3730 /* Here we start from the first slave up to slave_id */ 3731 i = slave_id; 3732 bond_for_each_slave_rcu(bond, slave, iter) { 3733 if (--i < 0) 3734 break; 3735 if (bond_slave_can_tx(slave)) { 3736 bond_dev_queue_xmit(bond, skb, slave->dev); 3737 return; 3738 } 3739 } 3740 /* no slave that can tx has been found */ 3741 bond_tx_drop(bond->dev, skb); 3742 } 3743 3744 /** 3745 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave 3746 * @bond: bonding device to use 3747 * 3748 * Based on the value of the bonding device's packets_per_slave parameter 3749 * this function generates a slave id, which is usually used as the next 3750 * slave to transmit through. 3751 */ 3752 static u32 bond_rr_gen_slave_id(struct bonding *bond) 3753 { 3754 u32 slave_id; 3755 struct reciprocal_value reciprocal_packets_per_slave; 3756 int packets_per_slave = bond->params.packets_per_slave; 3757 3758 switch (packets_per_slave) { 3759 case 0: 3760 slave_id = prandom_u32(); 3761 break; 3762 case 1: 3763 slave_id = bond->rr_tx_counter; 3764 break; 3765 default: 3766 reciprocal_packets_per_slave = 3767 bond->params.reciprocal_packets_per_slave; 3768 slave_id = reciprocal_divide(bond->rr_tx_counter, 3769 reciprocal_packets_per_slave); 3770 break; 3771 } 3772 bond->rr_tx_counter++; 3773 3774 return slave_id; 3775 } 3776 3777 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev) 3778 { 3779 struct bonding *bond = netdev_priv(bond_dev); 3780 struct iphdr *iph = ip_hdr(skb); 3781 struct slave *slave; 3782 u32 slave_id; 3783 3784 /* Start with the curr_active_slave that joined the bond as the 3785 * default for sending IGMP traffic. For failover purposes one 3786 * needs to maintain some consistency for the interface that will 3787 * send the join/membership reports. The curr_active_slave found 3788 * will send all of this type of traffic. 3789 */ 3790 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) { 3791 slave = rcu_dereference(bond->curr_active_slave); 3792 if (slave) 3793 bond_dev_queue_xmit(bond, skb, slave->dev); 3794 else 3795 bond_xmit_slave_id(bond, skb, 0); 3796 } else { 3797 int slave_cnt = ACCESS_ONCE(bond->slave_cnt); 3798 3799 if (likely(slave_cnt)) { 3800 slave_id = bond_rr_gen_slave_id(bond); 3801 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt); 3802 } else { 3803 bond_tx_drop(bond_dev, skb); 3804 } 3805 } 3806 3807 return NETDEV_TX_OK; 3808 } 3809 3810 /* In active-backup mode, we know that bond->curr_active_slave is always valid if 3811 * the bond has a usable interface. 3812 */ 3813 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev) 3814 { 3815 struct bonding *bond = netdev_priv(bond_dev); 3816 struct slave *slave; 3817 3818 slave = rcu_dereference(bond->curr_active_slave); 3819 if (slave) 3820 bond_dev_queue_xmit(bond, skb, slave->dev); 3821 else 3822 bond_tx_drop(bond_dev, skb); 3823 3824 return NETDEV_TX_OK; 3825 } 3826 3827 /* Use this to update slave_array when (a) it's not appropriate to update 3828 * slave_array right away (note that update_slave_array() may sleep) 3829 * and / or (b) RTNL is not held. 3830 */ 3831 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay) 3832 { 3833 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay); 3834 } 3835 3836 /* Slave array work handler. Holds only RTNL */ 3837 static void bond_slave_arr_handler(struct work_struct *work) 3838 { 3839 struct bonding *bond = container_of(work, struct bonding, 3840 slave_arr_work.work); 3841 int ret; 3842 3843 if (!rtnl_trylock()) 3844 goto err; 3845 3846 ret = bond_update_slave_arr(bond, NULL); 3847 rtnl_unlock(); 3848 if (ret) { 3849 pr_warn_ratelimited("Failed to update slave array from WT\n"); 3850 goto err; 3851 } 3852 return; 3853 3854 err: 3855 bond_slave_arr_work_rearm(bond, 1); 3856 } 3857 3858 /* Build the usable slaves array in control path for modes that use xmit-hash 3859 * to determine the slave interface - 3860 * (a) BOND_MODE_8023AD 3861 * (b) BOND_MODE_XOR 3862 * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0 3863 * 3864 * The caller is expected to hold RTNL only and NO other lock! 3865 */ 3866 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave) 3867 { 3868 struct slave *slave; 3869 struct list_head *iter; 3870 struct bond_up_slave *new_arr, *old_arr; 3871 int agg_id = 0; 3872 int ret = 0; 3873 3874 #ifdef CONFIG_LOCKDEP 3875 WARN_ON(lockdep_is_held(&bond->mode_lock)); 3876 #endif 3877 3878 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]), 3879 GFP_KERNEL); 3880 if (!new_arr) { 3881 ret = -ENOMEM; 3882 pr_err("Failed to build slave-array.\n"); 3883 goto out; 3884 } 3885 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3886 struct ad_info ad_info; 3887 3888 if (bond_3ad_get_active_agg_info(bond, &ad_info)) { 3889 pr_debug("bond_3ad_get_active_agg_info failed\n"); 3890 kfree_rcu(new_arr, rcu); 3891 /* No active aggragator means it's not safe to use 3892 * the previous array. 3893 */ 3894 old_arr = rtnl_dereference(bond->slave_arr); 3895 if (old_arr) { 3896 RCU_INIT_POINTER(bond->slave_arr, NULL); 3897 kfree_rcu(old_arr, rcu); 3898 } 3899 goto out; 3900 } 3901 agg_id = ad_info.aggregator_id; 3902 } 3903 bond_for_each_slave(bond, slave, iter) { 3904 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3905 struct aggregator *agg; 3906 3907 agg = SLAVE_AD_INFO(slave)->port.aggregator; 3908 if (!agg || agg->aggregator_identifier != agg_id) 3909 continue; 3910 } 3911 if (!bond_slave_can_tx(slave)) 3912 continue; 3913 if (skipslave == slave) 3914 continue; 3915 new_arr->arr[new_arr->count++] = slave; 3916 } 3917 3918 old_arr = rtnl_dereference(bond->slave_arr); 3919 rcu_assign_pointer(bond->slave_arr, new_arr); 3920 if (old_arr) 3921 kfree_rcu(old_arr, rcu); 3922 out: 3923 if (ret != 0 && skipslave) { 3924 int idx; 3925 3926 /* Rare situation where caller has asked to skip a specific 3927 * slave but allocation failed (most likely!). BTW this is 3928 * only possible when the call is initiated from 3929 * __bond_release_one(). In this situation; overwrite the 3930 * skipslave entry in the array with the last entry from the 3931 * array to avoid a situation where the xmit path may choose 3932 * this to-be-skipped slave to send a packet out. 3933 */ 3934 old_arr = rtnl_dereference(bond->slave_arr); 3935 for (idx = 0; idx < old_arr->count; idx++) { 3936 if (skipslave == old_arr->arr[idx]) { 3937 old_arr->arr[idx] = 3938 old_arr->arr[old_arr->count-1]; 3939 old_arr->count--; 3940 break; 3941 } 3942 } 3943 } 3944 return ret; 3945 } 3946 3947 /* Use this Xmit function for 3AD as well as XOR modes. The current 3948 * usable slave array is formed in the control path. The xmit function 3949 * just calculates hash and sends the packet out. 3950 */ 3951 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev) 3952 { 3953 struct bonding *bond = netdev_priv(dev); 3954 struct slave *slave; 3955 struct bond_up_slave *slaves; 3956 unsigned int count; 3957 3958 slaves = rcu_dereference(bond->slave_arr); 3959 count = slaves ? ACCESS_ONCE(slaves->count) : 0; 3960 if (likely(count)) { 3961 slave = slaves->arr[bond_xmit_hash(bond, skb) % count]; 3962 bond_dev_queue_xmit(bond, skb, slave->dev); 3963 } else { 3964 bond_tx_drop(dev, skb); 3965 } 3966 3967 return NETDEV_TX_OK; 3968 } 3969 3970 /* in broadcast mode, we send everything to all usable interfaces. */ 3971 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev) 3972 { 3973 struct bonding *bond = netdev_priv(bond_dev); 3974 struct slave *slave = NULL; 3975 struct list_head *iter; 3976 3977 bond_for_each_slave_rcu(bond, slave, iter) { 3978 if (bond_is_last_slave(bond, slave)) 3979 break; 3980 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 3981 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 3982 3983 if (!skb2) { 3984 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n", 3985 bond_dev->name, __func__); 3986 continue; 3987 } 3988 bond_dev_queue_xmit(bond, skb2, slave->dev); 3989 } 3990 } 3991 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) 3992 bond_dev_queue_xmit(bond, skb, slave->dev); 3993 else 3994 bond_tx_drop(bond_dev, skb); 3995 3996 return NETDEV_TX_OK; 3997 } 3998 3999 /*------------------------- Device initialization ---------------------------*/ 4000 4001 /* Lookup the slave that corresponds to a qid */ 4002 static inline int bond_slave_override(struct bonding *bond, 4003 struct sk_buff *skb) 4004 { 4005 struct slave *slave = NULL; 4006 struct list_head *iter; 4007 4008 if (!skb->queue_mapping) 4009 return 1; 4010 4011 /* Find out if any slaves have the same mapping as this skb. */ 4012 bond_for_each_slave_rcu(bond, slave, iter) { 4013 if (slave->queue_id == skb->queue_mapping) { 4014 if (bond_slave_is_up(slave) && 4015 slave->link == BOND_LINK_UP) { 4016 bond_dev_queue_xmit(bond, skb, slave->dev); 4017 return 0; 4018 } 4019 /* If the slave isn't UP, use default transmit policy. */ 4020 break; 4021 } 4022 } 4023 4024 return 1; 4025 } 4026 4027 4028 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb, 4029 void *accel_priv, select_queue_fallback_t fallback) 4030 { 4031 /* This helper function exists to help dev_pick_tx get the correct 4032 * destination queue. Using a helper function skips a call to 4033 * skb_tx_hash and will put the skbs in the queue we expect on their 4034 * way down to the bonding driver. 4035 */ 4036 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 4037 4038 /* Save the original txq to restore before passing to the driver */ 4039 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping; 4040 4041 if (unlikely(txq >= dev->real_num_tx_queues)) { 4042 do { 4043 txq -= dev->real_num_tx_queues; 4044 } while (txq >= dev->real_num_tx_queues); 4045 } 4046 return txq; 4047 } 4048 4049 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4050 { 4051 struct bonding *bond = netdev_priv(dev); 4052 4053 if (bond_should_override_tx_queue(bond) && 4054 !bond_slave_override(bond, skb)) 4055 return NETDEV_TX_OK; 4056 4057 switch (BOND_MODE(bond)) { 4058 case BOND_MODE_ROUNDROBIN: 4059 return bond_xmit_roundrobin(skb, dev); 4060 case BOND_MODE_ACTIVEBACKUP: 4061 return bond_xmit_activebackup(skb, dev); 4062 case BOND_MODE_8023AD: 4063 case BOND_MODE_XOR: 4064 return bond_3ad_xor_xmit(skb, dev); 4065 case BOND_MODE_BROADCAST: 4066 return bond_xmit_broadcast(skb, dev); 4067 case BOND_MODE_ALB: 4068 return bond_alb_xmit(skb, dev); 4069 case BOND_MODE_TLB: 4070 return bond_tlb_xmit(skb, dev); 4071 default: 4072 /* Should never happen, mode already checked */ 4073 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond)); 4074 WARN_ON_ONCE(1); 4075 bond_tx_drop(dev, skb); 4076 return NETDEV_TX_OK; 4077 } 4078 } 4079 4080 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4081 { 4082 struct bonding *bond = netdev_priv(dev); 4083 netdev_tx_t ret = NETDEV_TX_OK; 4084 4085 /* If we risk deadlock from transmitting this in the 4086 * netpoll path, tell netpoll to queue the frame for later tx 4087 */ 4088 if (unlikely(is_netpoll_tx_blocked(dev))) 4089 return NETDEV_TX_BUSY; 4090 4091 rcu_read_lock(); 4092 if (bond_has_slaves(bond)) 4093 ret = __bond_start_xmit(skb, dev); 4094 else 4095 bond_tx_drop(dev, skb); 4096 rcu_read_unlock(); 4097 4098 return ret; 4099 } 4100 4101 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev, 4102 struct ethtool_link_ksettings *cmd) 4103 { 4104 struct bonding *bond = netdev_priv(bond_dev); 4105 unsigned long speed = 0; 4106 struct list_head *iter; 4107 struct slave *slave; 4108 4109 cmd->base.duplex = DUPLEX_UNKNOWN; 4110 cmd->base.port = PORT_OTHER; 4111 4112 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we 4113 * do not need to check mode. Though link speed might not represent 4114 * the true receive or transmit bandwidth (not all modes are symmetric) 4115 * this is an accurate maximum. 4116 */ 4117 bond_for_each_slave(bond, slave, iter) { 4118 if (bond_slave_can_tx(slave)) { 4119 if (slave->speed != SPEED_UNKNOWN) 4120 speed += slave->speed; 4121 if (cmd->base.duplex == DUPLEX_UNKNOWN && 4122 slave->duplex != DUPLEX_UNKNOWN) 4123 cmd->base.duplex = slave->duplex; 4124 } 4125 } 4126 cmd->base.speed = speed ? : SPEED_UNKNOWN; 4127 4128 return 0; 4129 } 4130 4131 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 4132 struct ethtool_drvinfo *drvinfo) 4133 { 4134 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver)); 4135 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version)); 4136 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d", 4137 BOND_ABI_VERSION); 4138 } 4139 4140 static const struct ethtool_ops bond_ethtool_ops = { 4141 .get_drvinfo = bond_ethtool_get_drvinfo, 4142 .get_link = ethtool_op_get_link, 4143 .get_link_ksettings = bond_ethtool_get_link_ksettings, 4144 }; 4145 4146 static const struct net_device_ops bond_netdev_ops = { 4147 .ndo_init = bond_init, 4148 .ndo_uninit = bond_uninit, 4149 .ndo_open = bond_open, 4150 .ndo_stop = bond_close, 4151 .ndo_start_xmit = bond_start_xmit, 4152 .ndo_select_queue = bond_select_queue, 4153 .ndo_get_stats64 = bond_get_stats, 4154 .ndo_do_ioctl = bond_do_ioctl, 4155 .ndo_change_rx_flags = bond_change_rx_flags, 4156 .ndo_set_rx_mode = bond_set_rx_mode, 4157 .ndo_change_mtu = bond_change_mtu, 4158 .ndo_set_mac_address = bond_set_mac_address, 4159 .ndo_neigh_setup = bond_neigh_setup, 4160 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 4161 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 4162 #ifdef CONFIG_NET_POLL_CONTROLLER 4163 .ndo_netpoll_setup = bond_netpoll_setup, 4164 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 4165 .ndo_poll_controller = bond_poll_controller, 4166 #endif 4167 .ndo_add_slave = bond_enslave, 4168 .ndo_del_slave = bond_release, 4169 .ndo_fix_features = bond_fix_features, 4170 .ndo_bridge_setlink = switchdev_port_bridge_setlink, 4171 .ndo_bridge_getlink = switchdev_port_bridge_getlink, 4172 .ndo_bridge_dellink = switchdev_port_bridge_dellink, 4173 .ndo_fdb_add = switchdev_port_fdb_add, 4174 .ndo_fdb_del = switchdev_port_fdb_del, 4175 .ndo_fdb_dump = switchdev_port_fdb_dump, 4176 .ndo_features_check = passthru_features_check, 4177 }; 4178 4179 static const struct device_type bond_type = { 4180 .name = "bond", 4181 }; 4182 4183 static void bond_destructor(struct net_device *bond_dev) 4184 { 4185 struct bonding *bond = netdev_priv(bond_dev); 4186 if (bond->wq) 4187 destroy_workqueue(bond->wq); 4188 free_netdev(bond_dev); 4189 } 4190 4191 void bond_setup(struct net_device *bond_dev) 4192 { 4193 struct bonding *bond = netdev_priv(bond_dev); 4194 4195 spin_lock_init(&bond->mode_lock); 4196 spin_lock_init(&bond->stats_lock); 4197 bond->params = bonding_defaults; 4198 4199 /* Initialize pointers */ 4200 bond->dev = bond_dev; 4201 4202 /* Initialize the device entry points */ 4203 ether_setup(bond_dev); 4204 bond_dev->max_mtu = ETH_MAX_MTU; 4205 bond_dev->netdev_ops = &bond_netdev_ops; 4206 bond_dev->ethtool_ops = &bond_ethtool_ops; 4207 4208 bond_dev->destructor = bond_destructor; 4209 4210 SET_NETDEV_DEVTYPE(bond_dev, &bond_type); 4211 4212 /* Initialize the device options */ 4213 bond_dev->flags |= IFF_MASTER; 4214 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE; 4215 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 4216 4217 /* don't acquire bond device's netif_tx_lock when transmitting */ 4218 bond_dev->features |= NETIF_F_LLTX; 4219 4220 /* By default, we declare the bond to be fully 4221 * VLAN hardware accelerated capable. Special 4222 * care is taken in the various xmit functions 4223 * when there are slaves that are not hw accel 4224 * capable 4225 */ 4226 4227 /* Don't allow bond devices to change network namespaces. */ 4228 bond_dev->features |= NETIF_F_NETNS_LOCAL; 4229 4230 bond_dev->hw_features = BOND_VLAN_FEATURES | 4231 NETIF_F_HW_VLAN_CTAG_TX | 4232 NETIF_F_HW_VLAN_CTAG_RX | 4233 NETIF_F_HW_VLAN_CTAG_FILTER; 4234 4235 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL; 4236 bond_dev->features |= bond_dev->hw_features; 4237 } 4238 4239 /* Destroy a bonding device. 4240 * Must be under rtnl_lock when this function is called. 4241 */ 4242 static void bond_uninit(struct net_device *bond_dev) 4243 { 4244 struct bonding *bond = netdev_priv(bond_dev); 4245 struct list_head *iter; 4246 struct slave *slave; 4247 struct bond_up_slave *arr; 4248 4249 bond_netpoll_cleanup(bond_dev); 4250 4251 /* Release the bonded slaves */ 4252 bond_for_each_slave(bond, slave, iter) 4253 __bond_release_one(bond_dev, slave->dev, true); 4254 netdev_info(bond_dev, "Released all slaves\n"); 4255 4256 arr = rtnl_dereference(bond->slave_arr); 4257 if (arr) { 4258 RCU_INIT_POINTER(bond->slave_arr, NULL); 4259 kfree_rcu(arr, rcu); 4260 } 4261 4262 list_del(&bond->bond_list); 4263 4264 bond_debug_unregister(bond); 4265 } 4266 4267 /*------------------------- Module initialization ---------------------------*/ 4268 4269 static int bond_check_params(struct bond_params *params) 4270 { 4271 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i; 4272 struct bond_opt_value newval; 4273 const struct bond_opt_value *valptr; 4274 int arp_all_targets_value; 4275 u16 ad_actor_sys_prio = 0; 4276 u16 ad_user_port_key = 0; 4277 __be32 arp_target[BOND_MAX_ARP_TARGETS]; 4278 int arp_ip_count; 4279 int bond_mode = BOND_MODE_ROUNDROBIN; 4280 int xmit_hashtype = BOND_XMIT_POLICY_LAYER2; 4281 int lacp_fast = 0; 4282 int tlb_dynamic_lb = 0; 4283 4284 /* Convert string parameters. */ 4285 if (mode) { 4286 bond_opt_initstr(&newval, mode); 4287 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval); 4288 if (!valptr) { 4289 pr_err("Error: Invalid bonding mode \"%s\"\n", mode); 4290 return -EINVAL; 4291 } 4292 bond_mode = valptr->value; 4293 } 4294 4295 if (xmit_hash_policy) { 4296 if ((bond_mode != BOND_MODE_XOR) && 4297 (bond_mode != BOND_MODE_8023AD) && 4298 (bond_mode != BOND_MODE_TLB)) { 4299 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 4300 bond_mode_name(bond_mode)); 4301 } else { 4302 bond_opt_initstr(&newval, xmit_hash_policy); 4303 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH), 4304 &newval); 4305 if (!valptr) { 4306 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 4307 xmit_hash_policy); 4308 return -EINVAL; 4309 } 4310 xmit_hashtype = valptr->value; 4311 } 4312 } 4313 4314 if (lacp_rate) { 4315 if (bond_mode != BOND_MODE_8023AD) { 4316 pr_info("lacp_rate param is irrelevant in mode %s\n", 4317 bond_mode_name(bond_mode)); 4318 } else { 4319 bond_opt_initstr(&newval, lacp_rate); 4320 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE), 4321 &newval); 4322 if (!valptr) { 4323 pr_err("Error: Invalid lacp rate \"%s\"\n", 4324 lacp_rate); 4325 return -EINVAL; 4326 } 4327 lacp_fast = valptr->value; 4328 } 4329 } 4330 4331 if (ad_select) { 4332 bond_opt_initstr(&newval, ad_select); 4333 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT), 4334 &newval); 4335 if (!valptr) { 4336 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select); 4337 return -EINVAL; 4338 } 4339 params->ad_select = valptr->value; 4340 if (bond_mode != BOND_MODE_8023AD) 4341 pr_warn("ad_select param only affects 802.3ad mode\n"); 4342 } else { 4343 params->ad_select = BOND_AD_STABLE; 4344 } 4345 4346 if (max_bonds < 0) { 4347 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 4348 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 4349 max_bonds = BOND_DEFAULT_MAX_BONDS; 4350 } 4351 4352 if (miimon < 0) { 4353 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4354 miimon, INT_MAX); 4355 miimon = 0; 4356 } 4357 4358 if (updelay < 0) { 4359 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4360 updelay, INT_MAX); 4361 updelay = 0; 4362 } 4363 4364 if (downdelay < 0) { 4365 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4366 downdelay, INT_MAX); 4367 downdelay = 0; 4368 } 4369 4370 if ((use_carrier != 0) && (use_carrier != 1)) { 4371 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 4372 use_carrier); 4373 use_carrier = 1; 4374 } 4375 4376 if (num_peer_notif < 0 || num_peer_notif > 255) { 4377 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 4378 num_peer_notif); 4379 num_peer_notif = 1; 4380 } 4381 4382 /* reset values for 802.3ad/TLB/ALB */ 4383 if (!bond_mode_uses_arp(bond_mode)) { 4384 if (!miimon) { 4385 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"); 4386 pr_warn("Forcing miimon to 100msec\n"); 4387 miimon = BOND_DEFAULT_MIIMON; 4388 } 4389 } 4390 4391 if (tx_queues < 1 || tx_queues > 255) { 4392 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n", 4393 tx_queues, BOND_DEFAULT_TX_QUEUES); 4394 tx_queues = BOND_DEFAULT_TX_QUEUES; 4395 } 4396 4397 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 4398 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n", 4399 all_slaves_active); 4400 all_slaves_active = 0; 4401 } 4402 4403 if (resend_igmp < 0 || resend_igmp > 255) { 4404 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n", 4405 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 4406 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 4407 } 4408 4409 bond_opt_initval(&newval, packets_per_slave); 4410 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) { 4411 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n", 4412 packets_per_slave, USHRT_MAX); 4413 packets_per_slave = 1; 4414 } 4415 4416 if (bond_mode == BOND_MODE_ALB) { 4417 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", 4418 updelay); 4419 } 4420 4421 if (!miimon) { 4422 if (updelay || downdelay) { 4423 /* just warn the user the up/down delay will have 4424 * no effect since miimon is zero... 4425 */ 4426 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", 4427 updelay, downdelay); 4428 } 4429 } else { 4430 /* don't allow arp monitoring */ 4431 if (arp_interval) { 4432 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 4433 miimon, arp_interval); 4434 arp_interval = 0; 4435 } 4436 4437 if ((updelay % miimon) != 0) { 4438 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 4439 updelay, miimon, (updelay / miimon) * miimon); 4440 } 4441 4442 updelay /= miimon; 4443 4444 if ((downdelay % miimon) != 0) { 4445 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 4446 downdelay, miimon, 4447 (downdelay / miimon) * miimon); 4448 } 4449 4450 downdelay /= miimon; 4451 } 4452 4453 if (arp_interval < 0) { 4454 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4455 arp_interval, INT_MAX); 4456 arp_interval = 0; 4457 } 4458 4459 for (arp_ip_count = 0, i = 0; 4460 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) { 4461 __be32 ip; 4462 4463 /* not a complete check, but good enough to catch mistakes */ 4464 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) || 4465 !bond_is_ip_target_ok(ip)) { 4466 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 4467 arp_ip_target[i]); 4468 arp_interval = 0; 4469 } else { 4470 if (bond_get_targets_ip(arp_target, ip) == -1) 4471 arp_target[arp_ip_count++] = ip; 4472 else 4473 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n", 4474 &ip); 4475 } 4476 } 4477 4478 if (arp_interval && !arp_ip_count) { 4479 /* don't allow arping if no arp_ip_target given... */ 4480 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 4481 arp_interval); 4482 arp_interval = 0; 4483 } 4484 4485 if (arp_validate) { 4486 if (!arp_interval) { 4487 pr_err("arp_validate requires arp_interval\n"); 4488 return -EINVAL; 4489 } 4490 4491 bond_opt_initstr(&newval, arp_validate); 4492 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE), 4493 &newval); 4494 if (!valptr) { 4495 pr_err("Error: invalid arp_validate \"%s\"\n", 4496 arp_validate); 4497 return -EINVAL; 4498 } 4499 arp_validate_value = valptr->value; 4500 } else { 4501 arp_validate_value = 0; 4502 } 4503 4504 arp_all_targets_value = 0; 4505 if (arp_all_targets) { 4506 bond_opt_initstr(&newval, arp_all_targets); 4507 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS), 4508 &newval); 4509 if (!valptr) { 4510 pr_err("Error: invalid arp_all_targets_value \"%s\"\n", 4511 arp_all_targets); 4512 arp_all_targets_value = 0; 4513 } else { 4514 arp_all_targets_value = valptr->value; 4515 } 4516 } 4517 4518 if (miimon) { 4519 pr_info("MII link monitoring set to %d ms\n", miimon); 4520 } else if (arp_interval) { 4521 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE, 4522 arp_validate_value); 4523 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 4524 arp_interval, valptr->string, arp_ip_count); 4525 4526 for (i = 0; i < arp_ip_count; i++) 4527 pr_cont(" %s", arp_ip_target[i]); 4528 4529 pr_cont("\n"); 4530 4531 } else if (max_bonds) { 4532 /* miimon and arp_interval not set, we need one so things 4533 * work as expected, see bonding.txt for details 4534 */ 4535 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"); 4536 } 4537 4538 if (primary && !bond_mode_uses_primary(bond_mode)) { 4539 /* currently, using a primary only makes sense 4540 * in active backup, TLB or ALB modes 4541 */ 4542 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n", 4543 primary, bond_mode_name(bond_mode)); 4544 primary = NULL; 4545 } 4546 4547 if (primary && primary_reselect) { 4548 bond_opt_initstr(&newval, primary_reselect); 4549 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT), 4550 &newval); 4551 if (!valptr) { 4552 pr_err("Error: Invalid primary_reselect \"%s\"\n", 4553 primary_reselect); 4554 return -EINVAL; 4555 } 4556 primary_reselect_value = valptr->value; 4557 } else { 4558 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 4559 } 4560 4561 if (fail_over_mac) { 4562 bond_opt_initstr(&newval, fail_over_mac); 4563 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC), 4564 &newval); 4565 if (!valptr) { 4566 pr_err("Error: invalid fail_over_mac \"%s\"\n", 4567 fail_over_mac); 4568 return -EINVAL; 4569 } 4570 fail_over_mac_value = valptr->value; 4571 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 4572 pr_warn("Warning: fail_over_mac only affects active-backup mode\n"); 4573 } else { 4574 fail_over_mac_value = BOND_FOM_NONE; 4575 } 4576 4577 bond_opt_initstr(&newval, "default"); 4578 valptr = bond_opt_parse( 4579 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO), 4580 &newval); 4581 if (!valptr) { 4582 pr_err("Error: No ad_actor_sys_prio default value"); 4583 return -EINVAL; 4584 } 4585 ad_actor_sys_prio = valptr->value; 4586 4587 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY), 4588 &newval); 4589 if (!valptr) { 4590 pr_err("Error: No ad_user_port_key default value"); 4591 return -EINVAL; 4592 } 4593 ad_user_port_key = valptr->value; 4594 4595 if (bond_mode == BOND_MODE_TLB) { 4596 bond_opt_initstr(&newval, "default"); 4597 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), 4598 &newval); 4599 if (!valptr) { 4600 pr_err("Error: No tlb_dynamic_lb default value"); 4601 return -EINVAL; 4602 } 4603 tlb_dynamic_lb = valptr->value; 4604 } 4605 4606 if (lp_interval == 0) { 4607 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n", 4608 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL); 4609 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 4610 } 4611 4612 /* fill params struct with the proper values */ 4613 params->mode = bond_mode; 4614 params->xmit_policy = xmit_hashtype; 4615 params->miimon = miimon; 4616 params->num_peer_notif = num_peer_notif; 4617 params->arp_interval = arp_interval; 4618 params->arp_validate = arp_validate_value; 4619 params->arp_all_targets = arp_all_targets_value; 4620 params->updelay = updelay; 4621 params->downdelay = downdelay; 4622 params->use_carrier = use_carrier; 4623 params->lacp_fast = lacp_fast; 4624 params->primary[0] = 0; 4625 params->primary_reselect = primary_reselect_value; 4626 params->fail_over_mac = fail_over_mac_value; 4627 params->tx_queues = tx_queues; 4628 params->all_slaves_active = all_slaves_active; 4629 params->resend_igmp = resend_igmp; 4630 params->min_links = min_links; 4631 params->lp_interval = lp_interval; 4632 params->packets_per_slave = packets_per_slave; 4633 params->tlb_dynamic_lb = tlb_dynamic_lb; 4634 params->ad_actor_sys_prio = ad_actor_sys_prio; 4635 eth_zero_addr(params->ad_actor_system); 4636 params->ad_user_port_key = ad_user_port_key; 4637 if (packets_per_slave > 0) { 4638 params->reciprocal_packets_per_slave = 4639 reciprocal_value(packets_per_slave); 4640 } else { 4641 /* reciprocal_packets_per_slave is unused if 4642 * packets_per_slave is 0 or 1, just initialize it 4643 */ 4644 params->reciprocal_packets_per_slave = 4645 (struct reciprocal_value) { 0 }; 4646 } 4647 4648 if (primary) { 4649 strncpy(params->primary, primary, IFNAMSIZ); 4650 params->primary[IFNAMSIZ - 1] = 0; 4651 } 4652 4653 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 4654 4655 return 0; 4656 } 4657 4658 /* Called from registration process */ 4659 static int bond_init(struct net_device *bond_dev) 4660 { 4661 struct bonding *bond = netdev_priv(bond_dev); 4662 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 4663 4664 netdev_dbg(bond_dev, "Begin bond_init\n"); 4665 4666 bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM); 4667 if (!bond->wq) 4668 return -ENOMEM; 4669 4670 netdev_lockdep_set_classes(bond_dev); 4671 4672 list_add_tail(&bond->bond_list, &bn->dev_list); 4673 4674 bond_prepare_sysfs_group(bond); 4675 4676 bond_debug_register(bond); 4677 4678 /* Ensure valid dev_addr */ 4679 if (is_zero_ether_addr(bond_dev->dev_addr) && 4680 bond_dev->addr_assign_type == NET_ADDR_PERM) 4681 eth_hw_addr_random(bond_dev); 4682 4683 return 0; 4684 } 4685 4686 unsigned int bond_get_num_tx_queues(void) 4687 { 4688 return tx_queues; 4689 } 4690 4691 /* Create a new bond based on the specified name and bonding parameters. 4692 * If name is NULL, obtain a suitable "bond%d" name for us. 4693 * Caller must NOT hold rtnl_lock; we need to release it here before we 4694 * set up our sysfs entries. 4695 */ 4696 int bond_create(struct net *net, const char *name) 4697 { 4698 struct net_device *bond_dev; 4699 struct bonding *bond; 4700 struct alb_bond_info *bond_info; 4701 int res; 4702 4703 rtnl_lock(); 4704 4705 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 4706 name ? name : "bond%d", NET_NAME_UNKNOWN, 4707 bond_setup, tx_queues); 4708 if (!bond_dev) { 4709 pr_err("%s: eek! can't alloc netdev!\n", name); 4710 rtnl_unlock(); 4711 return -ENOMEM; 4712 } 4713 4714 /* 4715 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX. 4716 * It is set to 0 by default which is wrong. 4717 */ 4718 bond = netdev_priv(bond_dev); 4719 bond_info = &(BOND_ALB_INFO(bond)); 4720 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; 4721 4722 dev_net_set(bond_dev, net); 4723 bond_dev->rtnl_link_ops = &bond_link_ops; 4724 4725 res = register_netdevice(bond_dev); 4726 4727 netif_carrier_off(bond_dev); 4728 4729 bond_work_init_all(bond); 4730 4731 rtnl_unlock(); 4732 if (res < 0) 4733 bond_destructor(bond_dev); 4734 return res; 4735 } 4736 4737 static int __net_init bond_net_init(struct net *net) 4738 { 4739 struct bond_net *bn = net_generic(net, bond_net_id); 4740 4741 bn->net = net; 4742 INIT_LIST_HEAD(&bn->dev_list); 4743 4744 bond_create_proc_dir(bn); 4745 bond_create_sysfs(bn); 4746 4747 return 0; 4748 } 4749 4750 static void __net_exit bond_net_exit(struct net *net) 4751 { 4752 struct bond_net *bn = net_generic(net, bond_net_id); 4753 struct bonding *bond, *tmp_bond; 4754 LIST_HEAD(list); 4755 4756 bond_destroy_sysfs(bn); 4757 4758 /* Kill off any bonds created after unregistering bond rtnl ops */ 4759 rtnl_lock(); 4760 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list) 4761 unregister_netdevice_queue(bond->dev, &list); 4762 unregister_netdevice_many(&list); 4763 rtnl_unlock(); 4764 4765 bond_destroy_proc_dir(bn); 4766 } 4767 4768 static struct pernet_operations bond_net_ops = { 4769 .init = bond_net_init, 4770 .exit = bond_net_exit, 4771 .id = &bond_net_id, 4772 .size = sizeof(struct bond_net), 4773 }; 4774 4775 static int __init bonding_init(void) 4776 { 4777 int i; 4778 int res; 4779 4780 pr_info("%s", bond_version); 4781 4782 res = bond_check_params(&bonding_defaults); 4783 if (res) 4784 goto out; 4785 4786 res = register_pernet_subsys(&bond_net_ops); 4787 if (res) 4788 goto out; 4789 4790 res = bond_netlink_init(); 4791 if (res) 4792 goto err_link; 4793 4794 bond_create_debugfs(); 4795 4796 for (i = 0; i < max_bonds; i++) { 4797 res = bond_create(&init_net, NULL); 4798 if (res) 4799 goto err; 4800 } 4801 4802 register_netdevice_notifier(&bond_netdev_notifier); 4803 out: 4804 return res; 4805 err: 4806 bond_destroy_debugfs(); 4807 bond_netlink_fini(); 4808 err_link: 4809 unregister_pernet_subsys(&bond_net_ops); 4810 goto out; 4811 4812 } 4813 4814 static void __exit bonding_exit(void) 4815 { 4816 unregister_netdevice_notifier(&bond_netdev_notifier); 4817 4818 bond_destroy_debugfs(); 4819 4820 bond_netlink_fini(); 4821 unregister_pernet_subsys(&bond_net_ops); 4822 4823 #ifdef CONFIG_NET_POLL_CONTROLLER 4824 /* Make sure we don't have an imbalance on our netpoll blocking */ 4825 WARN_ON(atomic_read(&netpoll_block_tx)); 4826 #endif 4827 } 4828 4829 module_init(bonding_init); 4830 module_exit(bonding_exit); 4831 MODULE_LICENSE("GPL"); 4832 MODULE_VERSION(DRV_VERSION); 4833 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION); 4834 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 4835