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-alb, balance-tlb, balance-xor, 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_set_queue_mapping(skb, 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 NETIF_F_GSO_UDP_L4; 1112 bond_dev->gso_max_segs = gso_max_segs; 1113 netif_set_gso_max_size(bond_dev, gso_max_size); 1114 1115 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1116 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) && 1117 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM)) 1118 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE; 1119 1120 netdev_change_features(bond_dev); 1121 } 1122 1123 static void bond_setup_by_slave(struct net_device *bond_dev, 1124 struct net_device *slave_dev) 1125 { 1126 bond_dev->header_ops = slave_dev->header_ops; 1127 1128 bond_dev->type = slave_dev->type; 1129 bond_dev->hard_header_len = slave_dev->hard_header_len; 1130 bond_dev->addr_len = slave_dev->addr_len; 1131 1132 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1133 slave_dev->addr_len); 1134 } 1135 1136 /* On bonding slaves other than the currently active slave, suppress 1137 * duplicates except for alb non-mcast/bcast. 1138 */ 1139 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1140 struct slave *slave, 1141 struct bonding *bond) 1142 { 1143 if (bond_is_slave_inactive(slave)) { 1144 if (BOND_MODE(bond) == BOND_MODE_ALB && 1145 skb->pkt_type != PACKET_BROADCAST && 1146 skb->pkt_type != PACKET_MULTICAST) 1147 return false; 1148 return true; 1149 } 1150 return false; 1151 } 1152 1153 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1154 { 1155 struct sk_buff *skb = *pskb; 1156 struct slave *slave; 1157 struct bonding *bond; 1158 int (*recv_probe)(const struct sk_buff *, struct bonding *, 1159 struct slave *); 1160 int ret = RX_HANDLER_ANOTHER; 1161 1162 skb = skb_share_check(skb, GFP_ATOMIC); 1163 if (unlikely(!skb)) 1164 return RX_HANDLER_CONSUMED; 1165 1166 *pskb = skb; 1167 1168 slave = bond_slave_get_rcu(skb->dev); 1169 bond = slave->bond; 1170 1171 recv_probe = READ_ONCE(bond->recv_probe); 1172 if (recv_probe) { 1173 ret = recv_probe(skb, bond, slave); 1174 if (ret == RX_HANDLER_CONSUMED) { 1175 consume_skb(skb); 1176 return ret; 1177 } 1178 } 1179 1180 /* don't change skb->dev for link-local packets */ 1181 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest)) 1182 return RX_HANDLER_PASS; 1183 if (bond_should_deliver_exact_match(skb, slave, bond)) 1184 return RX_HANDLER_EXACT; 1185 1186 skb->dev = bond->dev; 1187 1188 if (BOND_MODE(bond) == BOND_MODE_ALB && 1189 bond->dev->priv_flags & IFF_BRIDGE_PORT && 1190 skb->pkt_type == PACKET_HOST) { 1191 1192 if (unlikely(skb_cow_head(skb, 1193 skb->data - skb_mac_header(skb)))) { 1194 kfree_skb(skb); 1195 return RX_HANDLER_CONSUMED; 1196 } 1197 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, 1198 bond->dev->addr_len); 1199 } 1200 1201 return ret; 1202 } 1203 1204 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond) 1205 { 1206 switch (BOND_MODE(bond)) { 1207 case BOND_MODE_ROUNDROBIN: 1208 return NETDEV_LAG_TX_TYPE_ROUNDROBIN; 1209 case BOND_MODE_ACTIVEBACKUP: 1210 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP; 1211 case BOND_MODE_BROADCAST: 1212 return NETDEV_LAG_TX_TYPE_BROADCAST; 1213 case BOND_MODE_XOR: 1214 case BOND_MODE_8023AD: 1215 return NETDEV_LAG_TX_TYPE_HASH; 1216 default: 1217 return NETDEV_LAG_TX_TYPE_UNKNOWN; 1218 } 1219 } 1220 1221 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond, 1222 enum netdev_lag_tx_type type) 1223 { 1224 if (type != NETDEV_LAG_TX_TYPE_HASH) 1225 return NETDEV_LAG_HASH_NONE; 1226 1227 switch (bond->params.xmit_policy) { 1228 case BOND_XMIT_POLICY_LAYER2: 1229 return NETDEV_LAG_HASH_L2; 1230 case BOND_XMIT_POLICY_LAYER34: 1231 return NETDEV_LAG_HASH_L34; 1232 case BOND_XMIT_POLICY_LAYER23: 1233 return NETDEV_LAG_HASH_L23; 1234 case BOND_XMIT_POLICY_ENCAP23: 1235 return NETDEV_LAG_HASH_E23; 1236 case BOND_XMIT_POLICY_ENCAP34: 1237 return NETDEV_LAG_HASH_E34; 1238 default: 1239 return NETDEV_LAG_HASH_UNKNOWN; 1240 } 1241 } 1242 1243 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave, 1244 struct netlink_ext_ack *extack) 1245 { 1246 struct netdev_lag_upper_info lag_upper_info; 1247 enum netdev_lag_tx_type type; 1248 1249 type = bond_lag_tx_type(bond); 1250 lag_upper_info.tx_type = type; 1251 lag_upper_info.hash_type = bond_lag_hash_type(bond, type); 1252 1253 return netdev_master_upper_dev_link(slave->dev, bond->dev, slave, 1254 &lag_upper_info, extack); 1255 } 1256 1257 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave) 1258 { 1259 netdev_upper_dev_unlink(slave->dev, bond->dev); 1260 slave->dev->flags &= ~IFF_SLAVE; 1261 } 1262 1263 static struct slave *bond_alloc_slave(struct bonding *bond) 1264 { 1265 struct slave *slave = NULL; 1266 1267 slave = kzalloc(sizeof(*slave), GFP_KERNEL); 1268 if (!slave) 1269 return NULL; 1270 1271 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1272 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info), 1273 GFP_KERNEL); 1274 if (!SLAVE_AD_INFO(slave)) { 1275 kfree(slave); 1276 return NULL; 1277 } 1278 } 1279 return slave; 1280 } 1281 1282 static void bond_free_slave(struct slave *slave) 1283 { 1284 struct bonding *bond = bond_get_bond_by_slave(slave); 1285 1286 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1287 kfree(SLAVE_AD_INFO(slave)); 1288 1289 kfree(slave); 1290 } 1291 1292 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info) 1293 { 1294 info->bond_mode = BOND_MODE(bond); 1295 info->miimon = bond->params.miimon; 1296 info->num_slaves = bond->slave_cnt; 1297 } 1298 1299 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info) 1300 { 1301 strcpy(info->slave_name, slave->dev->name); 1302 info->link = slave->link; 1303 info->state = bond_slave_state(slave); 1304 info->link_failure_count = slave->link_failure_count; 1305 } 1306 1307 static void bond_netdev_notify(struct net_device *dev, 1308 struct netdev_bonding_info *info) 1309 { 1310 rtnl_lock(); 1311 netdev_bonding_info_change(dev, info); 1312 rtnl_unlock(); 1313 } 1314 1315 static void bond_netdev_notify_work(struct work_struct *_work) 1316 { 1317 struct netdev_notify_work *w = 1318 container_of(_work, struct netdev_notify_work, work.work); 1319 1320 bond_netdev_notify(w->dev, &w->bonding_info); 1321 dev_put(w->dev); 1322 kfree(w); 1323 } 1324 1325 void bond_queue_slave_event(struct slave *slave) 1326 { 1327 struct bonding *bond = slave->bond; 1328 struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC); 1329 1330 if (!nnw) 1331 return; 1332 1333 dev_hold(slave->dev); 1334 nnw->dev = slave->dev; 1335 bond_fill_ifslave(slave, &nnw->bonding_info.slave); 1336 bond_fill_ifbond(bond, &nnw->bonding_info.master); 1337 INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work); 1338 1339 queue_delayed_work(slave->bond->wq, &nnw->work, 0); 1340 } 1341 1342 void bond_lower_state_changed(struct slave *slave) 1343 { 1344 struct netdev_lag_lower_state_info info; 1345 1346 info.link_up = slave->link == BOND_LINK_UP || 1347 slave->link == BOND_LINK_FAIL; 1348 info.tx_enabled = bond_is_active_slave(slave); 1349 netdev_lower_state_changed(slave->dev, &info); 1350 } 1351 1352 /* enslave device <slave> to bond device <master> */ 1353 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev, 1354 struct netlink_ext_ack *extack) 1355 { 1356 struct bonding *bond = netdev_priv(bond_dev); 1357 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1358 struct slave *new_slave = NULL, *prev_slave; 1359 struct sockaddr_storage ss; 1360 int link_reporting; 1361 int res = 0, i; 1362 1363 if (!bond->params.use_carrier && 1364 slave_dev->ethtool_ops->get_link == NULL && 1365 slave_ops->ndo_do_ioctl == NULL) { 1366 netdev_warn(bond_dev, "no link monitoring support for %s\n", 1367 slave_dev->name); 1368 } 1369 1370 /* already in-use? */ 1371 if (netdev_is_rx_handler_busy(slave_dev)) { 1372 NL_SET_ERR_MSG(extack, "Device is in use and cannot be enslaved"); 1373 netdev_err(bond_dev, 1374 "Error: Device is in use and cannot be enslaved\n"); 1375 return -EBUSY; 1376 } 1377 1378 if (bond_dev == slave_dev) { 1379 NL_SET_ERR_MSG(extack, "Cannot enslave bond to itself."); 1380 netdev_err(bond_dev, "cannot enslave bond to itself.\n"); 1381 return -EPERM; 1382 } 1383 1384 /* vlan challenged mutual exclusion */ 1385 /* no need to lock since we're protected by rtnl_lock */ 1386 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1387 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n", 1388 slave_dev->name); 1389 if (vlan_uses_dev(bond_dev)) { 1390 NL_SET_ERR_MSG(extack, "Can not enslave VLAN challenged device to VLAN enabled bond"); 1391 netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n", 1392 slave_dev->name, bond_dev->name); 1393 return -EPERM; 1394 } else { 1395 netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n", 1396 slave_dev->name, slave_dev->name, 1397 bond_dev->name); 1398 } 1399 } else { 1400 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n", 1401 slave_dev->name); 1402 } 1403 1404 /* Old ifenslave binaries are no longer supported. These can 1405 * be identified with moderate accuracy by the state of the slave: 1406 * the current ifenslave will set the interface down prior to 1407 * enslaving it; the old ifenslave will not. 1408 */ 1409 if (slave_dev->flags & IFF_UP) { 1410 NL_SET_ERR_MSG(extack, "Device can not be enslaved while up"); 1411 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n", 1412 slave_dev->name); 1413 return -EPERM; 1414 } 1415 1416 /* set bonding device ether type by slave - bonding netdevices are 1417 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1418 * there is a need to override some of the type dependent attribs/funcs. 1419 * 1420 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1421 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1422 */ 1423 if (!bond_has_slaves(bond)) { 1424 if (bond_dev->type != slave_dev->type) { 1425 netdev_dbg(bond_dev, "change device type from %d to %d\n", 1426 bond_dev->type, slave_dev->type); 1427 1428 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, 1429 bond_dev); 1430 res = notifier_to_errno(res); 1431 if (res) { 1432 netdev_err(bond_dev, "refused to change device type\n"); 1433 return -EBUSY; 1434 } 1435 1436 /* Flush unicast and multicast addresses */ 1437 dev_uc_flush(bond_dev); 1438 dev_mc_flush(bond_dev); 1439 1440 if (slave_dev->type != ARPHRD_ETHER) 1441 bond_setup_by_slave(bond_dev, slave_dev); 1442 else { 1443 ether_setup(bond_dev); 1444 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1445 } 1446 1447 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, 1448 bond_dev); 1449 } 1450 } else if (bond_dev->type != slave_dev->type) { 1451 NL_SET_ERR_MSG(extack, "Device type is different from other slaves"); 1452 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n", 1453 slave_dev->name, slave_dev->type, bond_dev->type); 1454 return -EINVAL; 1455 } 1456 1457 if (slave_dev->type == ARPHRD_INFINIBAND && 1458 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1459 NL_SET_ERR_MSG(extack, "Only active-backup mode is supported for infiniband slaves"); 1460 netdev_warn(bond_dev, "Type (%d) supports only active-backup mode\n", 1461 slave_dev->type); 1462 res = -EOPNOTSUPP; 1463 goto err_undo_flags; 1464 } 1465 1466 if (!slave_ops->ndo_set_mac_address || 1467 slave_dev->type == ARPHRD_INFINIBAND) { 1468 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n"); 1469 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP && 1470 bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1471 if (!bond_has_slaves(bond)) { 1472 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1473 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n"); 1474 } else { 1475 NL_SET_ERR_MSG(extack, "Slave device does not support setting the MAC address, but fail_over_mac is not set to active"); 1476 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"); 1477 res = -EOPNOTSUPP; 1478 goto err_undo_flags; 1479 } 1480 } 1481 } 1482 1483 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1484 1485 /* If this is the first slave, then we need to set the master's hardware 1486 * address to be the same as the slave's. 1487 */ 1488 if (!bond_has_slaves(bond) && 1489 bond->dev->addr_assign_type == NET_ADDR_RANDOM) 1490 bond_set_dev_addr(bond->dev, slave_dev); 1491 1492 new_slave = bond_alloc_slave(bond); 1493 if (!new_slave) { 1494 res = -ENOMEM; 1495 goto err_undo_flags; 1496 } 1497 1498 new_slave->bond = bond; 1499 new_slave->dev = slave_dev; 1500 /* Set the new_slave's queue_id to be zero. Queue ID mapping 1501 * is set via sysfs or module option if desired. 1502 */ 1503 new_slave->queue_id = 0; 1504 1505 /* Save slave's original mtu and then set it to match the bond */ 1506 new_slave->original_mtu = slave_dev->mtu; 1507 res = dev_set_mtu(slave_dev, bond->dev->mtu); 1508 if (res) { 1509 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res); 1510 goto err_free; 1511 } 1512 1513 /* Save slave's original ("permanent") mac address for modes 1514 * that need it, and for restoring it upon release, and then 1515 * set it to the master's address 1516 */ 1517 bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr, 1518 slave_dev->addr_len); 1519 1520 if (!bond->params.fail_over_mac || 1521 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1522 /* Set slave to master's mac address. The application already 1523 * set the master's mac address to that of the first slave 1524 */ 1525 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 1526 ss.ss_family = slave_dev->type; 1527 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss); 1528 if (res) { 1529 netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res); 1530 goto err_restore_mtu; 1531 } 1532 } 1533 1534 /* set slave flag before open to prevent IPv6 addrconf */ 1535 slave_dev->flags |= IFF_SLAVE; 1536 1537 /* open the slave since the application closed it */ 1538 res = dev_open(slave_dev); 1539 if (res) { 1540 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name); 1541 goto err_restore_mac; 1542 } 1543 1544 slave_dev->priv_flags |= IFF_BONDING; 1545 /* initialize slave stats */ 1546 dev_get_stats(new_slave->dev, &new_slave->slave_stats); 1547 1548 if (bond_is_lb(bond)) { 1549 /* bond_alb_init_slave() must be called before all other stages since 1550 * it might fail and we do not want to have to undo everything 1551 */ 1552 res = bond_alb_init_slave(bond, new_slave); 1553 if (res) 1554 goto err_close; 1555 } 1556 1557 res = vlan_vids_add_by_dev(slave_dev, bond_dev); 1558 if (res) { 1559 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n", 1560 slave_dev->name); 1561 goto err_close; 1562 } 1563 1564 prev_slave = bond_last_slave(bond); 1565 1566 new_slave->delay = 0; 1567 new_slave->link_failure_count = 0; 1568 1569 if (bond_update_speed_duplex(new_slave) && 1570 bond_needs_speed_duplex(bond)) 1571 new_slave->link = BOND_LINK_DOWN; 1572 1573 new_slave->last_rx = jiffies - 1574 (msecs_to_jiffies(bond->params.arp_interval) + 1); 1575 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) 1576 new_slave->target_last_arp_rx[i] = new_slave->last_rx; 1577 1578 if (bond->params.miimon && !bond->params.use_carrier) { 1579 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 1580 1581 if ((link_reporting == -1) && !bond->params.arp_interval) { 1582 /* miimon is set but a bonded network driver 1583 * does not support ETHTOOL/MII and 1584 * arp_interval is not set. Note: if 1585 * use_carrier is enabled, we will never go 1586 * here (because netif_carrier is always 1587 * supported); thus, we don't need to change 1588 * the messages for netif_carrier. 1589 */ 1590 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", 1591 slave_dev->name); 1592 } else if (link_reporting == -1) { 1593 /* unable get link status using mii/ethtool */ 1594 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", 1595 slave_dev->name); 1596 } 1597 } 1598 1599 /* check for initial state */ 1600 new_slave->link = BOND_LINK_NOCHANGE; 1601 if (bond->params.miimon) { 1602 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { 1603 if (bond->params.updelay) { 1604 bond_set_slave_link_state(new_slave, 1605 BOND_LINK_BACK, 1606 BOND_SLAVE_NOTIFY_NOW); 1607 new_slave->delay = bond->params.updelay; 1608 } else { 1609 bond_set_slave_link_state(new_slave, 1610 BOND_LINK_UP, 1611 BOND_SLAVE_NOTIFY_NOW); 1612 } 1613 } else { 1614 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN, 1615 BOND_SLAVE_NOTIFY_NOW); 1616 } 1617 } else if (bond->params.arp_interval) { 1618 bond_set_slave_link_state(new_slave, 1619 (netif_carrier_ok(slave_dev) ? 1620 BOND_LINK_UP : BOND_LINK_DOWN), 1621 BOND_SLAVE_NOTIFY_NOW); 1622 } else { 1623 bond_set_slave_link_state(new_slave, BOND_LINK_UP, 1624 BOND_SLAVE_NOTIFY_NOW); 1625 } 1626 1627 if (new_slave->link != BOND_LINK_DOWN) 1628 new_slave->last_link_up = jiffies; 1629 netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n", 1630 new_slave->link == BOND_LINK_DOWN ? "DOWN" : 1631 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); 1632 1633 if (bond_uses_primary(bond) && bond->params.primary[0]) { 1634 /* if there is a primary slave, remember it */ 1635 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 1636 rcu_assign_pointer(bond->primary_slave, new_slave); 1637 bond->force_primary = true; 1638 } 1639 } 1640 1641 switch (BOND_MODE(bond)) { 1642 case BOND_MODE_ACTIVEBACKUP: 1643 bond_set_slave_inactive_flags(new_slave, 1644 BOND_SLAVE_NOTIFY_NOW); 1645 break; 1646 case BOND_MODE_8023AD: 1647 /* in 802.3ad mode, the internal mechanism 1648 * will activate the slaves in the selected 1649 * aggregator 1650 */ 1651 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 1652 /* if this is the first slave */ 1653 if (!prev_slave) { 1654 SLAVE_AD_INFO(new_slave)->id = 1; 1655 /* Initialize AD with the number of times that the AD timer is called in 1 second 1656 * can be called only after the mac address of the bond is set 1657 */ 1658 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL); 1659 } else { 1660 SLAVE_AD_INFO(new_slave)->id = 1661 SLAVE_AD_INFO(prev_slave)->id + 1; 1662 } 1663 1664 bond_3ad_bind_slave(new_slave); 1665 break; 1666 case BOND_MODE_TLB: 1667 case BOND_MODE_ALB: 1668 bond_set_active_slave(new_slave); 1669 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 1670 break; 1671 default: 1672 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n"); 1673 1674 /* always active in trunk mode */ 1675 bond_set_active_slave(new_slave); 1676 1677 /* In trunking mode there is little meaning to curr_active_slave 1678 * anyway (it holds no special properties of the bond device), 1679 * so we can change it without calling change_active_interface() 1680 */ 1681 if (!rcu_access_pointer(bond->curr_active_slave) && 1682 new_slave->link == BOND_LINK_UP) 1683 rcu_assign_pointer(bond->curr_active_slave, new_slave); 1684 1685 break; 1686 } /* switch(bond_mode) */ 1687 1688 #ifdef CONFIG_NET_POLL_CONTROLLER 1689 if (bond->dev->npinfo) { 1690 if (slave_enable_netpoll(new_slave)) { 1691 netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n"); 1692 res = -EBUSY; 1693 goto err_detach; 1694 } 1695 } 1696 #endif 1697 1698 if (!(bond_dev->features & NETIF_F_LRO)) 1699 dev_disable_lro(slave_dev); 1700 1701 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 1702 new_slave); 1703 if (res) { 1704 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res); 1705 goto err_detach; 1706 } 1707 1708 res = bond_master_upper_dev_link(bond, new_slave, extack); 1709 if (res) { 1710 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res); 1711 goto err_unregister; 1712 } 1713 1714 res = bond_sysfs_slave_add(new_slave); 1715 if (res) { 1716 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res); 1717 goto err_upper_unlink; 1718 } 1719 1720 /* If the mode uses primary, then the following is handled by 1721 * bond_change_active_slave(). 1722 */ 1723 if (!bond_uses_primary(bond)) { 1724 /* set promiscuity level to new slave */ 1725 if (bond_dev->flags & IFF_PROMISC) { 1726 res = dev_set_promiscuity(slave_dev, 1); 1727 if (res) 1728 goto err_sysfs_del; 1729 } 1730 1731 /* set allmulti level to new slave */ 1732 if (bond_dev->flags & IFF_ALLMULTI) { 1733 res = dev_set_allmulti(slave_dev, 1); 1734 if (res) { 1735 if (bond_dev->flags & IFF_PROMISC) 1736 dev_set_promiscuity(slave_dev, -1); 1737 goto err_sysfs_del; 1738 } 1739 } 1740 1741 netif_addr_lock_bh(bond_dev); 1742 dev_mc_sync_multiple(slave_dev, bond_dev); 1743 dev_uc_sync_multiple(slave_dev, bond_dev); 1744 netif_addr_unlock_bh(bond_dev); 1745 1746 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1747 /* add lacpdu mc addr to mc list */ 1748 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 1749 1750 dev_mc_add(slave_dev, lacpdu_multicast); 1751 } 1752 } 1753 1754 bond->slave_cnt++; 1755 bond_compute_features(bond); 1756 bond_set_carrier(bond); 1757 1758 if (bond_uses_primary(bond)) { 1759 block_netpoll_tx(); 1760 bond_select_active_slave(bond); 1761 unblock_netpoll_tx(); 1762 } 1763 1764 if (bond_mode_can_use_xmit_hash(bond)) 1765 bond_update_slave_arr(bond, NULL); 1766 1767 bond->nest_level = dev_get_nest_level(bond_dev); 1768 1769 netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n", 1770 slave_dev->name, 1771 bond_is_active_slave(new_slave) ? "an active" : "a backup", 1772 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down"); 1773 1774 /* enslave is successful */ 1775 bond_queue_slave_event(new_slave); 1776 return 0; 1777 1778 /* Undo stages on error */ 1779 err_sysfs_del: 1780 bond_sysfs_slave_del(new_slave); 1781 1782 err_upper_unlink: 1783 bond_upper_dev_unlink(bond, new_slave); 1784 1785 err_unregister: 1786 netdev_rx_handler_unregister(slave_dev); 1787 1788 err_detach: 1789 vlan_vids_del_by_dev(slave_dev, bond_dev); 1790 if (rcu_access_pointer(bond->primary_slave) == new_slave) 1791 RCU_INIT_POINTER(bond->primary_slave, NULL); 1792 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) { 1793 block_netpoll_tx(); 1794 bond_change_active_slave(bond, NULL); 1795 bond_select_active_slave(bond); 1796 unblock_netpoll_tx(); 1797 } 1798 /* either primary_slave or curr_active_slave might've changed */ 1799 synchronize_rcu(); 1800 slave_disable_netpoll(new_slave); 1801 1802 err_close: 1803 slave_dev->priv_flags &= ~IFF_BONDING; 1804 dev_close(slave_dev); 1805 1806 err_restore_mac: 1807 slave_dev->flags &= ~IFF_SLAVE; 1808 if (!bond->params.fail_over_mac || 1809 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1810 /* XXX TODO - fom follow mode needs to change master's 1811 * MAC if this slave's MAC is in use by the bond, or at 1812 * least print a warning. 1813 */ 1814 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr, 1815 new_slave->dev->addr_len); 1816 ss.ss_family = slave_dev->type; 1817 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss); 1818 } 1819 1820 err_restore_mtu: 1821 dev_set_mtu(slave_dev, new_slave->original_mtu); 1822 1823 err_free: 1824 bond_free_slave(new_slave); 1825 1826 err_undo_flags: 1827 /* Enslave of first slave has failed and we need to fix master's mac */ 1828 if (!bond_has_slaves(bond)) { 1829 if (ether_addr_equal_64bits(bond_dev->dev_addr, 1830 slave_dev->dev_addr)) 1831 eth_hw_addr_random(bond_dev); 1832 if (bond_dev->type != ARPHRD_ETHER) { 1833 dev_close(bond_dev); 1834 ether_setup(bond_dev); 1835 bond_dev->flags |= IFF_MASTER; 1836 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1837 } 1838 } 1839 1840 return res; 1841 } 1842 1843 /* Try to release the slave device <slave> from the bond device <master> 1844 * It is legal to access curr_active_slave without a lock because all the function 1845 * is RTNL-locked. If "all" is true it means that the function is being called 1846 * while destroying a bond interface and all slaves are being released. 1847 * 1848 * The rules for slave state should be: 1849 * for Active/Backup: 1850 * Active stays on all backups go down 1851 * for Bonded connections: 1852 * The first up interface should be left on and all others downed. 1853 */ 1854 static int __bond_release_one(struct net_device *bond_dev, 1855 struct net_device *slave_dev, 1856 bool all, bool unregister) 1857 { 1858 struct bonding *bond = netdev_priv(bond_dev); 1859 struct slave *slave, *oldcurrent; 1860 struct sockaddr_storage ss; 1861 int old_flags = bond_dev->flags; 1862 netdev_features_t old_features = bond_dev->features; 1863 1864 /* slave is not a slave or master is not master of this slave */ 1865 if (!(slave_dev->flags & IFF_SLAVE) || 1866 !netdev_has_upper_dev(slave_dev, bond_dev)) { 1867 netdev_dbg(bond_dev, "cannot release %s\n", 1868 slave_dev->name); 1869 return -EINVAL; 1870 } 1871 1872 block_netpoll_tx(); 1873 1874 slave = bond_get_slave_by_dev(bond, slave_dev); 1875 if (!slave) { 1876 /* not a slave of this bond */ 1877 netdev_info(bond_dev, "%s not enslaved\n", 1878 slave_dev->name); 1879 unblock_netpoll_tx(); 1880 return -EINVAL; 1881 } 1882 1883 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW); 1884 1885 bond_sysfs_slave_del(slave); 1886 1887 /* recompute stats just before removing the slave */ 1888 bond_get_stats(bond->dev, &bond->bond_stats); 1889 1890 bond_upper_dev_unlink(bond, slave); 1891 /* unregister rx_handler early so bond_handle_frame wouldn't be called 1892 * for this slave anymore. 1893 */ 1894 netdev_rx_handler_unregister(slave_dev); 1895 1896 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1897 bond_3ad_unbind_slave(slave); 1898 1899 if (bond_mode_can_use_xmit_hash(bond)) 1900 bond_update_slave_arr(bond, slave); 1901 1902 netdev_info(bond_dev, "Releasing %s interface %s\n", 1903 bond_is_active_slave(slave) ? "active" : "backup", 1904 slave_dev->name); 1905 1906 oldcurrent = rcu_access_pointer(bond->curr_active_slave); 1907 1908 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 1909 1910 if (!all && (!bond->params.fail_over_mac || 1911 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) { 1912 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) && 1913 bond_has_slaves(bond)) 1914 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", 1915 slave_dev->name, slave->perm_hwaddr, 1916 bond_dev->name, slave_dev->name); 1917 } 1918 1919 if (rtnl_dereference(bond->primary_slave) == slave) 1920 RCU_INIT_POINTER(bond->primary_slave, NULL); 1921 1922 if (oldcurrent == slave) 1923 bond_change_active_slave(bond, NULL); 1924 1925 if (bond_is_lb(bond)) { 1926 /* Must be called only after the slave has been 1927 * detached from the list and the curr_active_slave 1928 * has been cleared (if our_slave == old_current), 1929 * but before a new active slave is selected. 1930 */ 1931 bond_alb_deinit_slave(bond, slave); 1932 } 1933 1934 if (all) { 1935 RCU_INIT_POINTER(bond->curr_active_slave, NULL); 1936 } else if (oldcurrent == slave) { 1937 /* Note that we hold RTNL over this sequence, so there 1938 * is no concern that another slave add/remove event 1939 * will interfere. 1940 */ 1941 bond_select_active_slave(bond); 1942 } 1943 1944 if (!bond_has_slaves(bond)) { 1945 bond_set_carrier(bond); 1946 eth_hw_addr_random(bond_dev); 1947 } 1948 1949 unblock_netpoll_tx(); 1950 synchronize_rcu(); 1951 bond->slave_cnt--; 1952 1953 if (!bond_has_slaves(bond)) { 1954 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 1955 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev); 1956 } 1957 1958 bond_compute_features(bond); 1959 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 1960 (old_features & NETIF_F_VLAN_CHALLENGED)) 1961 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n", 1962 slave_dev->name, bond_dev->name); 1963 1964 vlan_vids_del_by_dev(slave_dev, bond_dev); 1965 1966 /* If the mode uses primary, then this case was handled above by 1967 * bond_change_active_slave(..., NULL) 1968 */ 1969 if (!bond_uses_primary(bond)) { 1970 /* unset promiscuity level from slave 1971 * NOTE: The NETDEV_CHANGEADDR call above may change the value 1972 * of the IFF_PROMISC flag in the bond_dev, but we need the 1973 * value of that flag before that change, as that was the value 1974 * when this slave was attached, so we cache at the start of the 1975 * function and use it here. Same goes for ALLMULTI below 1976 */ 1977 if (old_flags & IFF_PROMISC) 1978 dev_set_promiscuity(slave_dev, -1); 1979 1980 /* unset allmulti level from slave */ 1981 if (old_flags & IFF_ALLMULTI) 1982 dev_set_allmulti(slave_dev, -1); 1983 1984 bond_hw_addr_flush(bond_dev, slave_dev); 1985 } 1986 1987 slave_disable_netpoll(slave); 1988 1989 /* close slave before restoring its mac address */ 1990 dev_close(slave_dev); 1991 1992 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE || 1993 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1994 /* restore original ("permanent") mac address */ 1995 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr, 1996 slave->dev->addr_len); 1997 ss.ss_family = slave_dev->type; 1998 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss); 1999 } 2000 2001 if (unregister) 2002 __dev_set_mtu(slave_dev, slave->original_mtu); 2003 else 2004 dev_set_mtu(slave_dev, slave->original_mtu); 2005 2006 slave_dev->priv_flags &= ~IFF_BONDING; 2007 2008 bond_free_slave(slave); 2009 2010 return 0; 2011 } 2012 2013 /* A wrapper used because of ndo_del_link */ 2014 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 2015 { 2016 return __bond_release_one(bond_dev, slave_dev, false, false); 2017 } 2018 2019 /* First release a slave and then destroy the bond if no more slaves are left. 2020 * Must be under rtnl_lock when this function is called. 2021 */ 2022 static int bond_release_and_destroy(struct net_device *bond_dev, 2023 struct net_device *slave_dev) 2024 { 2025 struct bonding *bond = netdev_priv(bond_dev); 2026 int ret; 2027 2028 ret = __bond_release_one(bond_dev, slave_dev, false, true); 2029 if (ret == 0 && !bond_has_slaves(bond)) { 2030 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 2031 netdev_info(bond_dev, "Destroying bond %s\n", 2032 bond_dev->name); 2033 bond_remove_proc_entry(bond); 2034 unregister_netdevice(bond_dev); 2035 } 2036 return ret; 2037 } 2038 2039 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info) 2040 { 2041 struct bonding *bond = netdev_priv(bond_dev); 2042 bond_fill_ifbond(bond, info); 2043 } 2044 2045 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 2046 { 2047 struct bonding *bond = netdev_priv(bond_dev); 2048 struct list_head *iter; 2049 int i = 0, res = -ENODEV; 2050 struct slave *slave; 2051 2052 bond_for_each_slave(bond, slave, iter) { 2053 if (i++ == (int)info->slave_id) { 2054 res = 0; 2055 bond_fill_ifslave(slave, info); 2056 break; 2057 } 2058 } 2059 2060 return res; 2061 } 2062 2063 /*-------------------------------- Monitoring -------------------------------*/ 2064 2065 /* called with rcu_read_lock() */ 2066 static int bond_miimon_inspect(struct bonding *bond) 2067 { 2068 int link_state, commit = 0; 2069 struct list_head *iter; 2070 struct slave *slave; 2071 bool ignore_updelay; 2072 2073 ignore_updelay = !rcu_dereference(bond->curr_active_slave); 2074 2075 bond_for_each_slave_rcu(bond, slave, iter) { 2076 slave->new_link = BOND_LINK_NOCHANGE; 2077 slave->link_new_state = slave->link; 2078 2079 link_state = bond_check_dev_link(bond, slave->dev, 0); 2080 2081 switch (slave->link) { 2082 case BOND_LINK_UP: 2083 if (link_state) 2084 continue; 2085 2086 bond_propose_link_state(slave, BOND_LINK_FAIL); 2087 commit++; 2088 slave->delay = bond->params.downdelay; 2089 if (slave->delay) { 2090 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n", 2091 (BOND_MODE(bond) == 2092 BOND_MODE_ACTIVEBACKUP) ? 2093 (bond_is_active_slave(slave) ? 2094 "active " : "backup ") : "", 2095 slave->dev->name, 2096 bond->params.downdelay * bond->params.miimon); 2097 } 2098 /*FALLTHRU*/ 2099 case BOND_LINK_FAIL: 2100 if (link_state) { 2101 /* recovered before downdelay expired */ 2102 bond_propose_link_state(slave, BOND_LINK_UP); 2103 slave->last_link_up = jiffies; 2104 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n", 2105 (bond->params.downdelay - slave->delay) * 2106 bond->params.miimon, 2107 slave->dev->name); 2108 commit++; 2109 continue; 2110 } 2111 2112 if (slave->delay <= 0) { 2113 slave->new_link = BOND_LINK_DOWN; 2114 commit++; 2115 continue; 2116 } 2117 2118 slave->delay--; 2119 break; 2120 2121 case BOND_LINK_DOWN: 2122 if (!link_state) 2123 continue; 2124 2125 bond_propose_link_state(slave, BOND_LINK_BACK); 2126 commit++; 2127 slave->delay = bond->params.updelay; 2128 2129 if (slave->delay) { 2130 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n", 2131 slave->dev->name, 2132 ignore_updelay ? 0 : 2133 bond->params.updelay * 2134 bond->params.miimon); 2135 } 2136 /*FALLTHRU*/ 2137 case BOND_LINK_BACK: 2138 if (!link_state) { 2139 bond_propose_link_state(slave, BOND_LINK_DOWN); 2140 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n", 2141 (bond->params.updelay - slave->delay) * 2142 bond->params.miimon, 2143 slave->dev->name); 2144 commit++; 2145 continue; 2146 } 2147 2148 if (ignore_updelay) 2149 slave->delay = 0; 2150 2151 if (slave->delay <= 0) { 2152 slave->new_link = BOND_LINK_UP; 2153 commit++; 2154 ignore_updelay = false; 2155 continue; 2156 } 2157 2158 slave->delay--; 2159 break; 2160 } 2161 } 2162 2163 return commit; 2164 } 2165 2166 static void bond_miimon_link_change(struct bonding *bond, 2167 struct slave *slave, 2168 char link) 2169 { 2170 switch (BOND_MODE(bond)) { 2171 case BOND_MODE_8023AD: 2172 bond_3ad_handle_link_change(slave, link); 2173 break; 2174 case BOND_MODE_TLB: 2175 case BOND_MODE_ALB: 2176 bond_alb_handle_link_change(bond, slave, link); 2177 break; 2178 case BOND_MODE_XOR: 2179 bond_update_slave_arr(bond, NULL); 2180 break; 2181 } 2182 } 2183 2184 static void bond_miimon_commit(struct bonding *bond) 2185 { 2186 struct list_head *iter; 2187 struct slave *slave, *primary; 2188 2189 bond_for_each_slave(bond, slave, iter) { 2190 switch (slave->new_link) { 2191 case BOND_LINK_NOCHANGE: 2192 continue; 2193 2194 case BOND_LINK_UP: 2195 if (bond_update_speed_duplex(slave) && 2196 bond_needs_speed_duplex(bond)) { 2197 slave->link = BOND_LINK_DOWN; 2198 if (net_ratelimit()) 2199 netdev_warn(bond->dev, 2200 "failed to get link speed/duplex for %s\n", 2201 slave->dev->name); 2202 continue; 2203 } 2204 bond_set_slave_link_state(slave, BOND_LINK_UP, 2205 BOND_SLAVE_NOTIFY_NOW); 2206 slave->last_link_up = jiffies; 2207 2208 primary = rtnl_dereference(bond->primary_slave); 2209 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 2210 /* prevent it from being the active one */ 2211 bond_set_backup_slave(slave); 2212 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2213 /* make it immediately active */ 2214 bond_set_active_slave(slave); 2215 } else if (slave != primary) { 2216 /* prevent it from being the active one */ 2217 bond_set_backup_slave(slave); 2218 } 2219 2220 netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n", 2221 slave->dev->name, 2222 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed, 2223 slave->duplex ? "full" : "half"); 2224 2225 bond_miimon_link_change(bond, slave, BOND_LINK_UP); 2226 2227 if (!bond->curr_active_slave || slave == primary) 2228 goto do_failover; 2229 2230 continue; 2231 2232 case BOND_LINK_DOWN: 2233 if (slave->link_failure_count < UINT_MAX) 2234 slave->link_failure_count++; 2235 2236 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2237 BOND_SLAVE_NOTIFY_NOW); 2238 2239 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP || 2240 BOND_MODE(bond) == BOND_MODE_8023AD) 2241 bond_set_slave_inactive_flags(slave, 2242 BOND_SLAVE_NOTIFY_NOW); 2243 2244 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n", 2245 slave->dev->name); 2246 2247 bond_miimon_link_change(bond, slave, BOND_LINK_DOWN); 2248 2249 if (slave == rcu_access_pointer(bond->curr_active_slave)) 2250 goto do_failover; 2251 2252 continue; 2253 2254 default: 2255 netdev_err(bond->dev, "invalid new link %d on slave %s\n", 2256 slave->new_link, slave->dev->name); 2257 slave->new_link = BOND_LINK_NOCHANGE; 2258 2259 continue; 2260 } 2261 2262 do_failover: 2263 block_netpoll_tx(); 2264 bond_select_active_slave(bond); 2265 unblock_netpoll_tx(); 2266 } 2267 2268 bond_set_carrier(bond); 2269 } 2270 2271 /* bond_mii_monitor 2272 * 2273 * Really a wrapper that splits the mii monitor into two phases: an 2274 * inspection, then (if inspection indicates something needs to be done) 2275 * an acquisition of appropriate locks followed by a commit phase to 2276 * implement whatever link state changes are indicated. 2277 */ 2278 static void bond_mii_monitor(struct work_struct *work) 2279 { 2280 struct bonding *bond = container_of(work, struct bonding, 2281 mii_work.work); 2282 bool should_notify_peers = false; 2283 unsigned long delay; 2284 struct slave *slave; 2285 struct list_head *iter; 2286 2287 delay = msecs_to_jiffies(bond->params.miimon); 2288 2289 if (!bond_has_slaves(bond)) 2290 goto re_arm; 2291 2292 rcu_read_lock(); 2293 2294 should_notify_peers = bond_should_notify_peers(bond); 2295 2296 if (bond_miimon_inspect(bond)) { 2297 rcu_read_unlock(); 2298 2299 /* Race avoidance with bond_close cancel of workqueue */ 2300 if (!rtnl_trylock()) { 2301 delay = 1; 2302 should_notify_peers = false; 2303 goto re_arm; 2304 } 2305 2306 bond_for_each_slave(bond, slave, iter) { 2307 bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER); 2308 } 2309 bond_miimon_commit(bond); 2310 2311 rtnl_unlock(); /* might sleep, hold no other locks */ 2312 } else 2313 rcu_read_unlock(); 2314 2315 re_arm: 2316 if (bond->params.miimon) 2317 queue_delayed_work(bond->wq, &bond->mii_work, delay); 2318 2319 if (should_notify_peers) { 2320 if (!rtnl_trylock()) 2321 return; 2322 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); 2323 rtnl_unlock(); 2324 } 2325 } 2326 2327 static int bond_upper_dev_walk(struct net_device *upper, void *data) 2328 { 2329 __be32 ip = *((__be32 *)data); 2330 2331 return ip == bond_confirm_addr(upper, 0, ip); 2332 } 2333 2334 static bool bond_has_this_ip(struct bonding *bond, __be32 ip) 2335 { 2336 bool ret = false; 2337 2338 if (ip == bond_confirm_addr(bond->dev, 0, ip)) 2339 return true; 2340 2341 rcu_read_lock(); 2342 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &ip)) 2343 ret = true; 2344 rcu_read_unlock(); 2345 2346 return ret; 2347 } 2348 2349 /* We go to the (large) trouble of VLAN tagging ARP frames because 2350 * switches in VLAN mode (especially if ports are configured as 2351 * "native" to a VLAN) might not pass non-tagged frames. 2352 */ 2353 static void bond_arp_send(struct net_device *slave_dev, int arp_op, 2354 __be32 dest_ip, __be32 src_ip, 2355 struct bond_vlan_tag *tags) 2356 { 2357 struct sk_buff *skb; 2358 struct bond_vlan_tag *outer_tag = tags; 2359 2360 netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n", 2361 arp_op, slave_dev->name, &dest_ip, &src_ip); 2362 2363 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2364 NULL, slave_dev->dev_addr, NULL); 2365 2366 if (!skb) { 2367 net_err_ratelimited("ARP packet allocation failed\n"); 2368 return; 2369 } 2370 2371 if (!tags || tags->vlan_proto == VLAN_N_VID) 2372 goto xmit; 2373 2374 tags++; 2375 2376 /* Go through all the tags backwards and add them to the packet */ 2377 while (tags->vlan_proto != VLAN_N_VID) { 2378 if (!tags->vlan_id) { 2379 tags++; 2380 continue; 2381 } 2382 2383 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n", 2384 ntohs(outer_tag->vlan_proto), tags->vlan_id); 2385 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto, 2386 tags->vlan_id); 2387 if (!skb) { 2388 net_err_ratelimited("failed to insert inner VLAN tag\n"); 2389 return; 2390 } 2391 2392 tags++; 2393 } 2394 /* Set the outer tag */ 2395 if (outer_tag->vlan_id) { 2396 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n", 2397 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id); 2398 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto, 2399 outer_tag->vlan_id); 2400 } 2401 2402 xmit: 2403 arp_xmit(skb); 2404 } 2405 2406 /* Validate the device path between the @start_dev and the @end_dev. 2407 * The path is valid if the @end_dev is reachable through device 2408 * stacking. 2409 * When the path is validated, collect any vlan information in the 2410 * path. 2411 */ 2412 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev, 2413 struct net_device *end_dev, 2414 int level) 2415 { 2416 struct bond_vlan_tag *tags; 2417 struct net_device *upper; 2418 struct list_head *iter; 2419 2420 if (start_dev == end_dev) { 2421 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC); 2422 if (!tags) 2423 return ERR_PTR(-ENOMEM); 2424 tags[level].vlan_proto = VLAN_N_VID; 2425 return tags; 2426 } 2427 2428 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) { 2429 tags = bond_verify_device_path(upper, end_dev, level + 1); 2430 if (IS_ERR_OR_NULL(tags)) { 2431 if (IS_ERR(tags)) 2432 return tags; 2433 continue; 2434 } 2435 if (is_vlan_dev(upper)) { 2436 tags[level].vlan_proto = vlan_dev_vlan_proto(upper); 2437 tags[level].vlan_id = vlan_dev_vlan_id(upper); 2438 } 2439 2440 return tags; 2441 } 2442 2443 return NULL; 2444 } 2445 2446 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2447 { 2448 struct rtable *rt; 2449 struct bond_vlan_tag *tags; 2450 __be32 *targets = bond->params.arp_targets, addr; 2451 int i; 2452 2453 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) { 2454 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]); 2455 tags = NULL; 2456 2457 /* Find out through which dev should the packet go */ 2458 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 2459 RTO_ONLINK, 0); 2460 if (IS_ERR(rt)) { 2461 /* there's no route to target - try to send arp 2462 * probe to generate any traffic (arp_validate=0) 2463 */ 2464 if (bond->params.arp_validate) 2465 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n", 2466 bond->dev->name, 2467 &targets[i]); 2468 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2469 0, tags); 2470 continue; 2471 } 2472 2473 /* bond device itself */ 2474 if (rt->dst.dev == bond->dev) 2475 goto found; 2476 2477 rcu_read_lock(); 2478 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0); 2479 rcu_read_unlock(); 2480 2481 if (!IS_ERR_OR_NULL(tags)) 2482 goto found; 2483 2484 /* Not our device - skip */ 2485 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n", 2486 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL"); 2487 2488 ip_rt_put(rt); 2489 continue; 2490 2491 found: 2492 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0); 2493 ip_rt_put(rt); 2494 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2495 addr, tags); 2496 kfree(tags); 2497 } 2498 } 2499 2500 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 2501 { 2502 int i; 2503 2504 if (!sip || !bond_has_this_ip(bond, tip)) { 2505 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n", 2506 &sip, &tip); 2507 return; 2508 } 2509 2510 i = bond_get_targets_ip(bond->params.arp_targets, sip); 2511 if (i == -1) { 2512 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n", 2513 &sip); 2514 return; 2515 } 2516 slave->last_rx = jiffies; 2517 slave->target_last_arp_rx[i] = jiffies; 2518 } 2519 2520 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, 2521 struct slave *slave) 2522 { 2523 struct arphdr *arp = (struct arphdr *)skb->data; 2524 struct slave *curr_active_slave, *curr_arp_slave; 2525 unsigned char *arp_ptr; 2526 __be32 sip, tip; 2527 int is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP); 2528 unsigned int alen; 2529 2530 if (!slave_do_arp_validate(bond, slave)) { 2531 if ((slave_do_arp_validate_only(bond) && is_arp) || 2532 !slave_do_arp_validate_only(bond)) 2533 slave->last_rx = jiffies; 2534 return RX_HANDLER_ANOTHER; 2535 } else if (!is_arp) { 2536 return RX_HANDLER_ANOTHER; 2537 } 2538 2539 alen = arp_hdr_len(bond->dev); 2540 2541 netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n", 2542 skb->dev->name); 2543 2544 if (alen > skb_headlen(skb)) { 2545 arp = kmalloc(alen, GFP_ATOMIC); 2546 if (!arp) 2547 goto out_unlock; 2548 if (skb_copy_bits(skb, 0, arp, alen) < 0) 2549 goto out_unlock; 2550 } 2551 2552 if (arp->ar_hln != bond->dev->addr_len || 2553 skb->pkt_type == PACKET_OTHERHOST || 2554 skb->pkt_type == PACKET_LOOPBACK || 2555 arp->ar_hrd != htons(ARPHRD_ETHER) || 2556 arp->ar_pro != htons(ETH_P_IP) || 2557 arp->ar_pln != 4) 2558 goto out_unlock; 2559 2560 arp_ptr = (unsigned char *)(arp + 1); 2561 arp_ptr += bond->dev->addr_len; 2562 memcpy(&sip, arp_ptr, 4); 2563 arp_ptr += 4 + bond->dev->addr_len; 2564 memcpy(&tip, arp_ptr, 4); 2565 2566 netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n", 2567 slave->dev->name, bond_slave_state(slave), 2568 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 2569 &sip, &tip); 2570 2571 curr_active_slave = rcu_dereference(bond->curr_active_slave); 2572 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 2573 2574 /* We 'trust' the received ARP enough to validate it if: 2575 * 2576 * (a) the slave receiving the ARP is active (which includes the 2577 * current ARP slave, if any), or 2578 * 2579 * (b) the receiving slave isn't active, but there is a currently 2580 * active slave and it received valid arp reply(s) after it became 2581 * the currently active slave, or 2582 * 2583 * (c) there is an ARP slave that sent an ARP during the prior ARP 2584 * interval, and we receive an ARP reply on any slave. We accept 2585 * these because switch FDB update delays may deliver the ARP 2586 * reply to a slave other than the sender of the ARP request. 2587 * 2588 * Note: for (b), backup slaves are receiving the broadcast ARP 2589 * request, not a reply. This request passes from the sending 2590 * slave through the L2 switch(es) to the receiving slave. Since 2591 * this is checking the request, sip/tip are swapped for 2592 * validation. 2593 * 2594 * This is done to avoid endless looping when we can't reach the 2595 * arp_ip_target and fool ourselves with our own arp requests. 2596 */ 2597 if (bond_is_active_slave(slave)) 2598 bond_validate_arp(bond, slave, sip, tip); 2599 else if (curr_active_slave && 2600 time_after(slave_last_rx(bond, curr_active_slave), 2601 curr_active_slave->last_link_up)) 2602 bond_validate_arp(bond, slave, tip, sip); 2603 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) && 2604 bond_time_in_interval(bond, 2605 dev_trans_start(curr_arp_slave->dev), 1)) 2606 bond_validate_arp(bond, slave, sip, tip); 2607 2608 out_unlock: 2609 if (arp != (struct arphdr *)skb->data) 2610 kfree(arp); 2611 return RX_HANDLER_ANOTHER; 2612 } 2613 2614 /* function to verify if we're in the arp_interval timeslice, returns true if 2615 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval + 2616 * arp_interval/2) . the arp_interval/2 is needed for really fast networks. 2617 */ 2618 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 2619 int mod) 2620 { 2621 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2622 2623 return time_in_range(jiffies, 2624 last_act - delta_in_ticks, 2625 last_act + mod * delta_in_ticks + delta_in_ticks/2); 2626 } 2627 2628 /* This function is called regularly to monitor each slave's link 2629 * ensuring that traffic is being sent and received when arp monitoring 2630 * is used in load-balancing mode. if the adapter has been dormant, then an 2631 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 2632 * arp monitoring in active backup mode. 2633 */ 2634 static void bond_loadbalance_arp_mon(struct bonding *bond) 2635 { 2636 struct slave *slave, *oldcurrent; 2637 struct list_head *iter; 2638 int do_failover = 0, slave_state_changed = 0; 2639 2640 if (!bond_has_slaves(bond)) 2641 goto re_arm; 2642 2643 rcu_read_lock(); 2644 2645 oldcurrent = rcu_dereference(bond->curr_active_slave); 2646 /* see if any of the previous devices are up now (i.e. they have 2647 * xmt and rcv traffic). the curr_active_slave does not come into 2648 * the picture unless it is null. also, slave->last_link_up is not 2649 * needed here because we send an arp on each slave and give a slave 2650 * as long as it needs to get the tx/rx within the delta. 2651 * TODO: what about up/down delay in arp mode? it wasn't here before 2652 * so it can wait 2653 */ 2654 bond_for_each_slave_rcu(bond, slave, iter) { 2655 unsigned long trans_start = dev_trans_start(slave->dev); 2656 2657 slave->new_link = BOND_LINK_NOCHANGE; 2658 2659 if (slave->link != BOND_LINK_UP) { 2660 if (bond_time_in_interval(bond, trans_start, 1) && 2661 bond_time_in_interval(bond, slave->last_rx, 1)) { 2662 2663 slave->new_link = BOND_LINK_UP; 2664 slave_state_changed = 1; 2665 2666 /* primary_slave has no meaning in round-robin 2667 * mode. the window of a slave being up and 2668 * curr_active_slave being null after enslaving 2669 * is closed. 2670 */ 2671 if (!oldcurrent) { 2672 netdev_info(bond->dev, "link status definitely up for interface %s\n", 2673 slave->dev->name); 2674 do_failover = 1; 2675 } else { 2676 netdev_info(bond->dev, "interface %s is now up\n", 2677 slave->dev->name); 2678 } 2679 } 2680 } else { 2681 /* slave->link == BOND_LINK_UP */ 2682 2683 /* not all switches will respond to an arp request 2684 * when the source ip is 0, so don't take the link down 2685 * if we don't know our ip yet 2686 */ 2687 if (!bond_time_in_interval(bond, trans_start, 2) || 2688 !bond_time_in_interval(bond, slave->last_rx, 2)) { 2689 2690 slave->new_link = BOND_LINK_DOWN; 2691 slave_state_changed = 1; 2692 2693 if (slave->link_failure_count < UINT_MAX) 2694 slave->link_failure_count++; 2695 2696 netdev_info(bond->dev, "interface %s is now down\n", 2697 slave->dev->name); 2698 2699 if (slave == oldcurrent) 2700 do_failover = 1; 2701 } 2702 } 2703 2704 /* note: if switch is in round-robin mode, all links 2705 * must tx arp to ensure all links rx an arp - otherwise 2706 * links may oscillate or not come up at all; if switch is 2707 * in something like xor mode, there is nothing we can 2708 * do - all replies will be rx'ed on same link causing slaves 2709 * to be unstable during low/no traffic periods 2710 */ 2711 if (bond_slave_is_up(slave)) 2712 bond_arp_send_all(bond, slave); 2713 } 2714 2715 rcu_read_unlock(); 2716 2717 if (do_failover || slave_state_changed) { 2718 if (!rtnl_trylock()) 2719 goto re_arm; 2720 2721 bond_for_each_slave(bond, slave, iter) { 2722 if (slave->new_link != BOND_LINK_NOCHANGE) 2723 slave->link = slave->new_link; 2724 } 2725 2726 if (slave_state_changed) { 2727 bond_slave_state_change(bond); 2728 if (BOND_MODE(bond) == BOND_MODE_XOR) 2729 bond_update_slave_arr(bond, NULL); 2730 } 2731 if (do_failover) { 2732 block_netpoll_tx(); 2733 bond_select_active_slave(bond); 2734 unblock_netpoll_tx(); 2735 } 2736 rtnl_unlock(); 2737 } 2738 2739 re_arm: 2740 if (bond->params.arp_interval) 2741 queue_delayed_work(bond->wq, &bond->arp_work, 2742 msecs_to_jiffies(bond->params.arp_interval)); 2743 } 2744 2745 /* Called to inspect slaves for active-backup mode ARP monitor link state 2746 * changes. Sets new_link in slaves to specify what action should take 2747 * place for the slave. Returns 0 if no changes are found, >0 if changes 2748 * to link states must be committed. 2749 * 2750 * Called with rcu_read_lock held. 2751 */ 2752 static int bond_ab_arp_inspect(struct bonding *bond) 2753 { 2754 unsigned long trans_start, last_rx; 2755 struct list_head *iter; 2756 struct slave *slave; 2757 int commit = 0; 2758 2759 bond_for_each_slave_rcu(bond, slave, iter) { 2760 slave->new_link = BOND_LINK_NOCHANGE; 2761 last_rx = slave_last_rx(bond, slave); 2762 2763 if (slave->link != BOND_LINK_UP) { 2764 if (bond_time_in_interval(bond, last_rx, 1)) { 2765 slave->new_link = BOND_LINK_UP; 2766 commit++; 2767 } 2768 continue; 2769 } 2770 2771 /* Give slaves 2*delta after being enslaved or made 2772 * active. This avoids bouncing, as the last receive 2773 * times need a full ARP monitor cycle to be updated. 2774 */ 2775 if (bond_time_in_interval(bond, slave->last_link_up, 2)) 2776 continue; 2777 2778 /* Backup slave is down if: 2779 * - No current_arp_slave AND 2780 * - more than 3*delta since last receive AND 2781 * - the bond has an IP address 2782 * 2783 * Note: a non-null current_arp_slave indicates 2784 * the curr_active_slave went down and we are 2785 * searching for a new one; under this condition 2786 * we only take the curr_active_slave down - this 2787 * gives each slave a chance to tx/rx traffic 2788 * before being taken out 2789 */ 2790 if (!bond_is_active_slave(slave) && 2791 !rcu_access_pointer(bond->current_arp_slave) && 2792 !bond_time_in_interval(bond, last_rx, 3)) { 2793 slave->new_link = BOND_LINK_DOWN; 2794 commit++; 2795 } 2796 2797 /* Active slave is down if: 2798 * - more than 2*delta since transmitting OR 2799 * - (more than 2*delta since receive AND 2800 * the bond has an IP address) 2801 */ 2802 trans_start = dev_trans_start(slave->dev); 2803 if (bond_is_active_slave(slave) && 2804 (!bond_time_in_interval(bond, trans_start, 2) || 2805 !bond_time_in_interval(bond, last_rx, 2))) { 2806 slave->new_link = BOND_LINK_DOWN; 2807 commit++; 2808 } 2809 } 2810 2811 return commit; 2812 } 2813 2814 /* Called to commit link state changes noted by inspection step of 2815 * active-backup mode ARP monitor. 2816 * 2817 * Called with RTNL hold. 2818 */ 2819 static void bond_ab_arp_commit(struct bonding *bond) 2820 { 2821 unsigned long trans_start; 2822 struct list_head *iter; 2823 struct slave *slave; 2824 2825 bond_for_each_slave(bond, slave, iter) { 2826 switch (slave->new_link) { 2827 case BOND_LINK_NOCHANGE: 2828 continue; 2829 2830 case BOND_LINK_UP: 2831 trans_start = dev_trans_start(slave->dev); 2832 if (rtnl_dereference(bond->curr_active_slave) != slave || 2833 (!rtnl_dereference(bond->curr_active_slave) && 2834 bond_time_in_interval(bond, trans_start, 1))) { 2835 struct slave *current_arp_slave; 2836 2837 current_arp_slave = rtnl_dereference(bond->current_arp_slave); 2838 bond_set_slave_link_state(slave, BOND_LINK_UP, 2839 BOND_SLAVE_NOTIFY_NOW); 2840 if (current_arp_slave) { 2841 bond_set_slave_inactive_flags( 2842 current_arp_slave, 2843 BOND_SLAVE_NOTIFY_NOW); 2844 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2845 } 2846 2847 netdev_info(bond->dev, "link status definitely up for interface %s\n", 2848 slave->dev->name); 2849 2850 if (!rtnl_dereference(bond->curr_active_slave) || 2851 slave == rtnl_dereference(bond->primary_slave)) 2852 goto do_failover; 2853 2854 } 2855 2856 continue; 2857 2858 case BOND_LINK_DOWN: 2859 if (slave->link_failure_count < UINT_MAX) 2860 slave->link_failure_count++; 2861 2862 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2863 BOND_SLAVE_NOTIFY_NOW); 2864 bond_set_slave_inactive_flags(slave, 2865 BOND_SLAVE_NOTIFY_NOW); 2866 2867 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n", 2868 slave->dev->name); 2869 2870 if (slave == rtnl_dereference(bond->curr_active_slave)) { 2871 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2872 goto do_failover; 2873 } 2874 2875 continue; 2876 2877 default: 2878 netdev_err(bond->dev, "impossible: new_link %d on slave %s\n", 2879 slave->new_link, slave->dev->name); 2880 continue; 2881 } 2882 2883 do_failover: 2884 block_netpoll_tx(); 2885 bond_select_active_slave(bond); 2886 unblock_netpoll_tx(); 2887 } 2888 2889 bond_set_carrier(bond); 2890 } 2891 2892 /* Send ARP probes for active-backup mode ARP monitor. 2893 * 2894 * Called with rcu_read_lock held. 2895 */ 2896 static bool bond_ab_arp_probe(struct bonding *bond) 2897 { 2898 struct slave *slave, *before = NULL, *new_slave = NULL, 2899 *curr_arp_slave = rcu_dereference(bond->current_arp_slave), 2900 *curr_active_slave = rcu_dereference(bond->curr_active_slave); 2901 struct list_head *iter; 2902 bool found = false; 2903 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; 2904 2905 if (curr_arp_slave && curr_active_slave) 2906 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n", 2907 curr_arp_slave->dev->name, 2908 curr_active_slave->dev->name); 2909 2910 if (curr_active_slave) { 2911 bond_arp_send_all(bond, curr_active_slave); 2912 return should_notify_rtnl; 2913 } 2914 2915 /* if we don't have a curr_active_slave, search for the next available 2916 * backup slave from the current_arp_slave and make it the candidate 2917 * for becoming the curr_active_slave 2918 */ 2919 2920 if (!curr_arp_slave) { 2921 curr_arp_slave = bond_first_slave_rcu(bond); 2922 if (!curr_arp_slave) 2923 return should_notify_rtnl; 2924 } 2925 2926 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER); 2927 2928 bond_for_each_slave_rcu(bond, slave, iter) { 2929 if (!found && !before && bond_slave_is_up(slave)) 2930 before = slave; 2931 2932 if (found && !new_slave && bond_slave_is_up(slave)) 2933 new_slave = slave; 2934 /* if the link state is up at this point, we 2935 * mark it down - this can happen if we have 2936 * simultaneous link failures and 2937 * reselect_active_interface doesn't make this 2938 * one the current slave so it is still marked 2939 * up when it is actually down 2940 */ 2941 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 2942 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2943 BOND_SLAVE_NOTIFY_LATER); 2944 if (slave->link_failure_count < UINT_MAX) 2945 slave->link_failure_count++; 2946 2947 bond_set_slave_inactive_flags(slave, 2948 BOND_SLAVE_NOTIFY_LATER); 2949 2950 netdev_info(bond->dev, "backup interface %s is now down\n", 2951 slave->dev->name); 2952 } 2953 if (slave == curr_arp_slave) 2954 found = true; 2955 } 2956 2957 if (!new_slave && before) 2958 new_slave = before; 2959 2960 if (!new_slave) 2961 goto check_state; 2962 2963 bond_set_slave_link_state(new_slave, BOND_LINK_BACK, 2964 BOND_SLAVE_NOTIFY_LATER); 2965 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER); 2966 bond_arp_send_all(bond, new_slave); 2967 new_slave->last_link_up = jiffies; 2968 rcu_assign_pointer(bond->current_arp_slave, new_slave); 2969 2970 check_state: 2971 bond_for_each_slave_rcu(bond, slave, iter) { 2972 if (slave->should_notify || slave->should_notify_link) { 2973 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; 2974 break; 2975 } 2976 } 2977 return should_notify_rtnl; 2978 } 2979 2980 static void bond_activebackup_arp_mon(struct bonding *bond) 2981 { 2982 bool should_notify_peers = false; 2983 bool should_notify_rtnl = false; 2984 int delta_in_ticks; 2985 2986 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2987 2988 if (!bond_has_slaves(bond)) 2989 goto re_arm; 2990 2991 rcu_read_lock(); 2992 2993 should_notify_peers = bond_should_notify_peers(bond); 2994 2995 if (bond_ab_arp_inspect(bond)) { 2996 rcu_read_unlock(); 2997 2998 /* Race avoidance with bond_close flush of workqueue */ 2999 if (!rtnl_trylock()) { 3000 delta_in_ticks = 1; 3001 should_notify_peers = false; 3002 goto re_arm; 3003 } 3004 3005 bond_ab_arp_commit(bond); 3006 3007 rtnl_unlock(); 3008 rcu_read_lock(); 3009 } 3010 3011 should_notify_rtnl = bond_ab_arp_probe(bond); 3012 rcu_read_unlock(); 3013 3014 re_arm: 3015 if (bond->params.arp_interval) 3016 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 3017 3018 if (should_notify_peers || should_notify_rtnl) { 3019 if (!rtnl_trylock()) 3020 return; 3021 3022 if (should_notify_peers) 3023 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 3024 bond->dev); 3025 if (should_notify_rtnl) { 3026 bond_slave_state_notify(bond); 3027 bond_slave_link_notify(bond); 3028 } 3029 3030 rtnl_unlock(); 3031 } 3032 } 3033 3034 static void bond_arp_monitor(struct work_struct *work) 3035 { 3036 struct bonding *bond = container_of(work, struct bonding, 3037 arp_work.work); 3038 3039 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3040 bond_activebackup_arp_mon(bond); 3041 else 3042 bond_loadbalance_arp_mon(bond); 3043 } 3044 3045 /*-------------------------- netdev event handling --------------------------*/ 3046 3047 /* Change device name */ 3048 static int bond_event_changename(struct bonding *bond) 3049 { 3050 bond_remove_proc_entry(bond); 3051 bond_create_proc_entry(bond); 3052 3053 bond_debug_reregister(bond); 3054 3055 return NOTIFY_DONE; 3056 } 3057 3058 static int bond_master_netdev_event(unsigned long event, 3059 struct net_device *bond_dev) 3060 { 3061 struct bonding *event_bond = netdev_priv(bond_dev); 3062 3063 switch (event) { 3064 case NETDEV_CHANGENAME: 3065 return bond_event_changename(event_bond); 3066 case NETDEV_UNREGISTER: 3067 bond_remove_proc_entry(event_bond); 3068 break; 3069 case NETDEV_REGISTER: 3070 bond_create_proc_entry(event_bond); 3071 break; 3072 case NETDEV_NOTIFY_PEERS: 3073 if (event_bond->send_peer_notif) 3074 event_bond->send_peer_notif--; 3075 break; 3076 default: 3077 break; 3078 } 3079 3080 return NOTIFY_DONE; 3081 } 3082 3083 static int bond_slave_netdev_event(unsigned long event, 3084 struct net_device *slave_dev) 3085 { 3086 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary; 3087 struct bonding *bond; 3088 struct net_device *bond_dev; 3089 3090 /* A netdev event can be generated while enslaving a device 3091 * before netdev_rx_handler_register is called in which case 3092 * slave will be NULL 3093 */ 3094 if (!slave) 3095 return NOTIFY_DONE; 3096 bond_dev = slave->bond->dev; 3097 bond = slave->bond; 3098 primary = rtnl_dereference(bond->primary_slave); 3099 3100 switch (event) { 3101 case NETDEV_UNREGISTER: 3102 if (bond_dev->type != ARPHRD_ETHER) 3103 bond_release_and_destroy(bond_dev, slave_dev); 3104 else 3105 __bond_release_one(bond_dev, slave_dev, false, true); 3106 break; 3107 case NETDEV_UP: 3108 case NETDEV_CHANGE: 3109 /* For 802.3ad mode only: 3110 * Getting invalid Speed/Duplex values here will put slave 3111 * in weird state. So mark it as link-down for the time 3112 * being and let link-monitoring (miimon) set it right when 3113 * correct speeds/duplex are available. 3114 */ 3115 if (bond_update_speed_duplex(slave) && 3116 BOND_MODE(bond) == BOND_MODE_8023AD) 3117 slave->link = BOND_LINK_DOWN; 3118 3119 if (BOND_MODE(bond) == BOND_MODE_8023AD) 3120 bond_3ad_adapter_speed_duplex_changed(slave); 3121 /* Fallthrough */ 3122 case NETDEV_DOWN: 3123 /* Refresh slave-array if applicable! 3124 * If the setup does not use miimon or arpmon (mode-specific!), 3125 * then these events will not cause the slave-array to be 3126 * refreshed. This will cause xmit to use a slave that is not 3127 * usable. Avoid such situation by refeshing the array at these 3128 * events. If these (miimon/arpmon) parameters are configured 3129 * then array gets refreshed twice and that should be fine! 3130 */ 3131 if (bond_mode_can_use_xmit_hash(bond)) 3132 bond_update_slave_arr(bond, NULL); 3133 break; 3134 case NETDEV_CHANGEMTU: 3135 /* TODO: Should slaves be allowed to 3136 * independently alter their MTU? For 3137 * an active-backup bond, slaves need 3138 * not be the same type of device, so 3139 * MTUs may vary. For other modes, 3140 * slaves arguably should have the 3141 * same MTUs. To do this, we'd need to 3142 * take over the slave's change_mtu 3143 * function for the duration of their 3144 * servitude. 3145 */ 3146 break; 3147 case NETDEV_CHANGENAME: 3148 /* we don't care if we don't have primary set */ 3149 if (!bond_uses_primary(bond) || 3150 !bond->params.primary[0]) 3151 break; 3152 3153 if (slave == primary) { 3154 /* slave's name changed - he's no longer primary */ 3155 RCU_INIT_POINTER(bond->primary_slave, NULL); 3156 } else if (!strcmp(slave_dev->name, bond->params.primary)) { 3157 /* we have a new primary slave */ 3158 rcu_assign_pointer(bond->primary_slave, slave); 3159 } else { /* we didn't change primary - exit */ 3160 break; 3161 } 3162 3163 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n", 3164 primary ? slave_dev->name : "none"); 3165 3166 block_netpoll_tx(); 3167 bond_select_active_slave(bond); 3168 unblock_netpoll_tx(); 3169 break; 3170 case NETDEV_FEAT_CHANGE: 3171 bond_compute_features(bond); 3172 break; 3173 case NETDEV_RESEND_IGMP: 3174 /* Propagate to master device */ 3175 call_netdevice_notifiers(event, slave->bond->dev); 3176 break; 3177 default: 3178 break; 3179 } 3180 3181 return NOTIFY_DONE; 3182 } 3183 3184 /* bond_netdev_event: handle netdev notifier chain events. 3185 * 3186 * This function receives events for the netdev chain. The caller (an 3187 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 3188 * locks for us to safely manipulate the slave devices (RTNL lock, 3189 * dev_probe_lock). 3190 */ 3191 static int bond_netdev_event(struct notifier_block *this, 3192 unsigned long event, void *ptr) 3193 { 3194 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 3195 3196 netdev_dbg(event_dev, "event: %lx\n", event); 3197 3198 if (!(event_dev->priv_flags & IFF_BONDING)) 3199 return NOTIFY_DONE; 3200 3201 if (event_dev->flags & IFF_MASTER) { 3202 netdev_dbg(event_dev, "IFF_MASTER\n"); 3203 return bond_master_netdev_event(event, event_dev); 3204 } 3205 3206 if (event_dev->flags & IFF_SLAVE) { 3207 netdev_dbg(event_dev, "IFF_SLAVE\n"); 3208 return bond_slave_netdev_event(event, event_dev); 3209 } 3210 3211 return NOTIFY_DONE; 3212 } 3213 3214 static struct notifier_block bond_netdev_notifier = { 3215 .notifier_call = bond_netdev_event, 3216 }; 3217 3218 /*---------------------------- Hashing Policies -----------------------------*/ 3219 3220 /* L2 hash helper */ 3221 static inline u32 bond_eth_hash(struct sk_buff *skb) 3222 { 3223 struct ethhdr *ep, hdr_tmp; 3224 3225 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp); 3226 if (ep) 3227 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto; 3228 return 0; 3229 } 3230 3231 /* Extract the appropriate headers based on bond's xmit policy */ 3232 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, 3233 struct flow_keys *fk) 3234 { 3235 const struct ipv6hdr *iph6; 3236 const struct iphdr *iph; 3237 int noff, proto = -1; 3238 3239 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23) 3240 return skb_flow_dissect_flow_keys(skb, fk, 0); 3241 3242 fk->ports.ports = 0; 3243 noff = skb_network_offset(skb); 3244 if (skb->protocol == htons(ETH_P_IP)) { 3245 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph)))) 3246 return false; 3247 iph = ip_hdr(skb); 3248 iph_to_flow_copy_v4addrs(fk, iph); 3249 noff += iph->ihl << 2; 3250 if (!ip_is_fragment(iph)) 3251 proto = iph->protocol; 3252 } else if (skb->protocol == htons(ETH_P_IPV6)) { 3253 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6)))) 3254 return false; 3255 iph6 = ipv6_hdr(skb); 3256 iph_to_flow_copy_v6addrs(fk, iph6); 3257 noff += sizeof(*iph6); 3258 proto = iph6->nexthdr; 3259 } else { 3260 return false; 3261 } 3262 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0) 3263 fk->ports.ports = skb_flow_get_ports(skb, noff, proto); 3264 3265 return true; 3266 } 3267 3268 /** 3269 * bond_xmit_hash - generate a hash value based on the xmit policy 3270 * @bond: bonding device 3271 * @skb: buffer to use for headers 3272 * 3273 * This function will extract the necessary headers from the skb buffer and use 3274 * them to generate a hash based on the xmit_policy set in the bonding device 3275 */ 3276 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb) 3277 { 3278 struct flow_keys flow; 3279 u32 hash; 3280 3281 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 && 3282 skb->l4_hash) 3283 return skb->hash; 3284 3285 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 || 3286 !bond_flow_dissect(bond, skb, &flow)) 3287 return bond_eth_hash(skb); 3288 3289 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 || 3290 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) 3291 hash = bond_eth_hash(skb); 3292 else 3293 hash = (__force u32)flow.ports.ports; 3294 hash ^= (__force u32)flow_get_u32_dst(&flow) ^ 3295 (__force u32)flow_get_u32_src(&flow); 3296 hash ^= (hash >> 16); 3297 hash ^= (hash >> 8); 3298 3299 return hash >> 1; 3300 } 3301 3302 /*-------------------------- Device entry points ----------------------------*/ 3303 3304 void bond_work_init_all(struct bonding *bond) 3305 { 3306 INIT_DELAYED_WORK(&bond->mcast_work, 3307 bond_resend_igmp_join_requests_delayed); 3308 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 3309 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 3310 INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor); 3311 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 3312 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler); 3313 } 3314 3315 static void bond_work_cancel_all(struct bonding *bond) 3316 { 3317 cancel_delayed_work_sync(&bond->mii_work); 3318 cancel_delayed_work_sync(&bond->arp_work); 3319 cancel_delayed_work_sync(&bond->alb_work); 3320 cancel_delayed_work_sync(&bond->ad_work); 3321 cancel_delayed_work_sync(&bond->mcast_work); 3322 cancel_delayed_work_sync(&bond->slave_arr_work); 3323 } 3324 3325 static int bond_open(struct net_device *bond_dev) 3326 { 3327 struct bonding *bond = netdev_priv(bond_dev); 3328 struct list_head *iter; 3329 struct slave *slave; 3330 3331 /* reset slave->backup and slave->inactive */ 3332 if (bond_has_slaves(bond)) { 3333 bond_for_each_slave(bond, slave, iter) { 3334 if (bond_uses_primary(bond) && 3335 slave != rcu_access_pointer(bond->curr_active_slave)) { 3336 bond_set_slave_inactive_flags(slave, 3337 BOND_SLAVE_NOTIFY_NOW); 3338 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) { 3339 bond_set_slave_active_flags(slave, 3340 BOND_SLAVE_NOTIFY_NOW); 3341 } 3342 } 3343 } 3344 3345 if (bond_is_lb(bond)) { 3346 /* bond_alb_initialize must be called before the timer 3347 * is started. 3348 */ 3349 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB))) 3350 return -ENOMEM; 3351 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB) 3352 queue_delayed_work(bond->wq, &bond->alb_work, 0); 3353 } 3354 3355 if (bond->params.miimon) /* link check interval, in milliseconds. */ 3356 queue_delayed_work(bond->wq, &bond->mii_work, 0); 3357 3358 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 3359 queue_delayed_work(bond->wq, &bond->arp_work, 0); 3360 bond->recv_probe = bond_arp_rcv; 3361 } 3362 3363 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3364 queue_delayed_work(bond->wq, &bond->ad_work, 0); 3365 /* register to receive LACPDUs */ 3366 bond->recv_probe = bond_3ad_lacpdu_recv; 3367 bond_3ad_initiate_agg_selection(bond, 1); 3368 } 3369 3370 if (bond_mode_can_use_xmit_hash(bond)) 3371 bond_update_slave_arr(bond, NULL); 3372 3373 return 0; 3374 } 3375 3376 static int bond_close(struct net_device *bond_dev) 3377 { 3378 struct bonding *bond = netdev_priv(bond_dev); 3379 3380 bond_work_cancel_all(bond); 3381 bond->send_peer_notif = 0; 3382 if (bond_is_lb(bond)) 3383 bond_alb_deinitialize(bond); 3384 bond->recv_probe = NULL; 3385 3386 return 0; 3387 } 3388 3389 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but 3390 * that some drivers can provide 32bit values only. 3391 */ 3392 static void bond_fold_stats(struct rtnl_link_stats64 *_res, 3393 const struct rtnl_link_stats64 *_new, 3394 const struct rtnl_link_stats64 *_old) 3395 { 3396 const u64 *new = (const u64 *)_new; 3397 const u64 *old = (const u64 *)_old; 3398 u64 *res = (u64 *)_res; 3399 int i; 3400 3401 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) { 3402 u64 nv = new[i]; 3403 u64 ov = old[i]; 3404 s64 delta = nv - ov; 3405 3406 /* detects if this particular field is 32bit only */ 3407 if (((nv | ov) >> 32) == 0) 3408 delta = (s64)(s32)((u32)nv - (u32)ov); 3409 3410 /* filter anomalies, some drivers reset their stats 3411 * at down/up events. 3412 */ 3413 if (delta > 0) 3414 res[i] += delta; 3415 } 3416 } 3417 3418 static void bond_get_stats(struct net_device *bond_dev, 3419 struct rtnl_link_stats64 *stats) 3420 { 3421 struct bonding *bond = netdev_priv(bond_dev); 3422 struct rtnl_link_stats64 temp; 3423 struct list_head *iter; 3424 struct slave *slave; 3425 3426 spin_lock(&bond->stats_lock); 3427 memcpy(stats, &bond->bond_stats, sizeof(*stats)); 3428 3429 rcu_read_lock(); 3430 bond_for_each_slave_rcu(bond, slave, iter) { 3431 const struct rtnl_link_stats64 *new = 3432 dev_get_stats(slave->dev, &temp); 3433 3434 bond_fold_stats(stats, new, &slave->slave_stats); 3435 3436 /* save off the slave stats for the next run */ 3437 memcpy(&slave->slave_stats, new, sizeof(*new)); 3438 } 3439 rcu_read_unlock(); 3440 3441 memcpy(&bond->bond_stats, stats, sizeof(*stats)); 3442 spin_unlock(&bond->stats_lock); 3443 } 3444 3445 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 3446 { 3447 struct bonding *bond = netdev_priv(bond_dev); 3448 struct net_device *slave_dev = NULL; 3449 struct ifbond k_binfo; 3450 struct ifbond __user *u_binfo = NULL; 3451 struct ifslave k_sinfo; 3452 struct ifslave __user *u_sinfo = NULL; 3453 struct mii_ioctl_data *mii = NULL; 3454 struct bond_opt_value newval; 3455 struct net *net; 3456 int res = 0; 3457 3458 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd); 3459 3460 switch (cmd) { 3461 case SIOCGMIIPHY: 3462 mii = if_mii(ifr); 3463 if (!mii) 3464 return -EINVAL; 3465 3466 mii->phy_id = 0; 3467 /* Fall Through */ 3468 case SIOCGMIIREG: 3469 /* We do this again just in case we were called by SIOCGMIIREG 3470 * instead of SIOCGMIIPHY. 3471 */ 3472 mii = if_mii(ifr); 3473 if (!mii) 3474 return -EINVAL; 3475 3476 if (mii->reg_num == 1) { 3477 mii->val_out = 0; 3478 if (netif_carrier_ok(bond->dev)) 3479 mii->val_out = BMSR_LSTATUS; 3480 } 3481 3482 return 0; 3483 case BOND_INFO_QUERY_OLD: 3484 case SIOCBONDINFOQUERY: 3485 u_binfo = (struct ifbond __user *)ifr->ifr_data; 3486 3487 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 3488 return -EFAULT; 3489 3490 bond_info_query(bond_dev, &k_binfo); 3491 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 3492 return -EFAULT; 3493 3494 return 0; 3495 case BOND_SLAVE_INFO_QUERY_OLD: 3496 case SIOCBONDSLAVEINFOQUERY: 3497 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 3498 3499 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 3500 return -EFAULT; 3501 3502 res = bond_slave_info_query(bond_dev, &k_sinfo); 3503 if (res == 0 && 3504 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 3505 return -EFAULT; 3506 3507 return res; 3508 default: 3509 break; 3510 } 3511 3512 net = dev_net(bond_dev); 3513 3514 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3515 return -EPERM; 3516 3517 slave_dev = __dev_get_by_name(net, ifr->ifr_slave); 3518 3519 netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev); 3520 3521 if (!slave_dev) 3522 return -ENODEV; 3523 3524 netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name); 3525 switch (cmd) { 3526 case BOND_ENSLAVE_OLD: 3527 case SIOCBONDENSLAVE: 3528 res = bond_enslave(bond_dev, slave_dev, NULL); 3529 break; 3530 case BOND_RELEASE_OLD: 3531 case SIOCBONDRELEASE: 3532 res = bond_release(bond_dev, slave_dev); 3533 break; 3534 case BOND_SETHWADDR_OLD: 3535 case SIOCBONDSETHWADDR: 3536 bond_set_dev_addr(bond_dev, slave_dev); 3537 res = 0; 3538 break; 3539 case BOND_CHANGE_ACTIVE_OLD: 3540 case SIOCBONDCHANGEACTIVE: 3541 bond_opt_initstr(&newval, slave_dev->name); 3542 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE, 3543 &newval); 3544 break; 3545 default: 3546 res = -EOPNOTSUPP; 3547 } 3548 3549 return res; 3550 } 3551 3552 static void bond_change_rx_flags(struct net_device *bond_dev, int change) 3553 { 3554 struct bonding *bond = netdev_priv(bond_dev); 3555 3556 if (change & IFF_PROMISC) 3557 bond_set_promiscuity(bond, 3558 bond_dev->flags & IFF_PROMISC ? 1 : -1); 3559 3560 if (change & IFF_ALLMULTI) 3561 bond_set_allmulti(bond, 3562 bond_dev->flags & IFF_ALLMULTI ? 1 : -1); 3563 } 3564 3565 static void bond_set_rx_mode(struct net_device *bond_dev) 3566 { 3567 struct bonding *bond = netdev_priv(bond_dev); 3568 struct list_head *iter; 3569 struct slave *slave; 3570 3571 rcu_read_lock(); 3572 if (bond_uses_primary(bond)) { 3573 slave = rcu_dereference(bond->curr_active_slave); 3574 if (slave) { 3575 dev_uc_sync(slave->dev, bond_dev); 3576 dev_mc_sync(slave->dev, bond_dev); 3577 } 3578 } else { 3579 bond_for_each_slave_rcu(bond, slave, iter) { 3580 dev_uc_sync_multiple(slave->dev, bond_dev); 3581 dev_mc_sync_multiple(slave->dev, bond_dev); 3582 } 3583 } 3584 rcu_read_unlock(); 3585 } 3586 3587 static int bond_neigh_init(struct neighbour *n) 3588 { 3589 struct bonding *bond = netdev_priv(n->dev); 3590 const struct net_device_ops *slave_ops; 3591 struct neigh_parms parms; 3592 struct slave *slave; 3593 int ret; 3594 3595 slave = bond_first_slave(bond); 3596 if (!slave) 3597 return 0; 3598 slave_ops = slave->dev->netdev_ops; 3599 if (!slave_ops->ndo_neigh_setup) 3600 return 0; 3601 3602 parms.neigh_setup = NULL; 3603 parms.neigh_cleanup = NULL; 3604 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); 3605 if (ret) 3606 return ret; 3607 3608 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called 3609 * after the last slave has been detached. Assumes that all slaves 3610 * utilize the same neigh_cleanup (true at this writing as only user 3611 * is ipoib). 3612 */ 3613 n->parms->neigh_cleanup = parms.neigh_cleanup; 3614 3615 if (!parms.neigh_setup) 3616 return 0; 3617 3618 return parms.neigh_setup(n); 3619 } 3620 3621 /* The bonding ndo_neigh_setup is called at init time beofre any 3622 * slave exists. So we must declare proxy setup function which will 3623 * be used at run time to resolve the actual slave neigh param setup. 3624 * 3625 * It's also called by master devices (such as vlans) to setup their 3626 * underlying devices. In that case - do nothing, we're already set up from 3627 * our init. 3628 */ 3629 static int bond_neigh_setup(struct net_device *dev, 3630 struct neigh_parms *parms) 3631 { 3632 /* modify only our neigh_parms */ 3633 if (parms->dev == dev) 3634 parms->neigh_setup = bond_neigh_init; 3635 3636 return 0; 3637 } 3638 3639 /* Change the MTU of all of a master's slaves to match the master */ 3640 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 3641 { 3642 struct bonding *bond = netdev_priv(bond_dev); 3643 struct slave *slave, *rollback_slave; 3644 struct list_head *iter; 3645 int res = 0; 3646 3647 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu); 3648 3649 bond_for_each_slave(bond, slave, iter) { 3650 netdev_dbg(bond_dev, "s %p c_m %p\n", 3651 slave, slave->dev->netdev_ops->ndo_change_mtu); 3652 3653 res = dev_set_mtu(slave->dev, new_mtu); 3654 3655 if (res) { 3656 /* If we failed to set the slave's mtu to the new value 3657 * we must abort the operation even in ACTIVE_BACKUP 3658 * mode, because if we allow the backup slaves to have 3659 * different mtu values than the active slave we'll 3660 * need to change their mtu when doing a failover. That 3661 * means changing their mtu from timer context, which 3662 * is probably not a good idea. 3663 */ 3664 netdev_dbg(bond_dev, "err %d %s\n", res, 3665 slave->dev->name); 3666 goto unwind; 3667 } 3668 } 3669 3670 bond_dev->mtu = new_mtu; 3671 3672 return 0; 3673 3674 unwind: 3675 /* unwind from head to the slave that failed */ 3676 bond_for_each_slave(bond, rollback_slave, iter) { 3677 int tmp_res; 3678 3679 if (rollback_slave == slave) 3680 break; 3681 3682 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu); 3683 if (tmp_res) { 3684 netdev_dbg(bond_dev, "unwind err %d dev %s\n", 3685 tmp_res, rollback_slave->dev->name); 3686 } 3687 } 3688 3689 return res; 3690 } 3691 3692 /* Change HW address 3693 * 3694 * Note that many devices must be down to change the HW address, and 3695 * downing the master releases all slaves. We can make bonds full of 3696 * bonding devices to test this, however. 3697 */ 3698 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 3699 { 3700 struct bonding *bond = netdev_priv(bond_dev); 3701 struct slave *slave, *rollback_slave; 3702 struct sockaddr_storage *ss = addr, tmp_ss; 3703 struct list_head *iter; 3704 int res = 0; 3705 3706 if (BOND_MODE(bond) == BOND_MODE_ALB) 3707 return bond_alb_set_mac_address(bond_dev, addr); 3708 3709 3710 netdev_dbg(bond_dev, "bond=%p\n", bond); 3711 3712 /* If fail_over_mac is enabled, do nothing and return success. 3713 * Returning an error causes ifenslave to fail. 3714 */ 3715 if (bond->params.fail_over_mac && 3716 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3717 return 0; 3718 3719 if (!is_valid_ether_addr(ss->__data)) 3720 return -EADDRNOTAVAIL; 3721 3722 bond_for_each_slave(bond, slave, iter) { 3723 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name); 3724 res = dev_set_mac_address(slave->dev, addr); 3725 if (res) { 3726 /* TODO: consider downing the slave 3727 * and retry ? 3728 * User should expect communications 3729 * breakage anyway until ARP finish 3730 * updating, so... 3731 */ 3732 netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name); 3733 goto unwind; 3734 } 3735 } 3736 3737 /* success */ 3738 memcpy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len); 3739 return 0; 3740 3741 unwind: 3742 memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 3743 tmp_ss.ss_family = bond_dev->type; 3744 3745 /* unwind from head to the slave that failed */ 3746 bond_for_each_slave(bond, rollback_slave, iter) { 3747 int tmp_res; 3748 3749 if (rollback_slave == slave) 3750 break; 3751 3752 tmp_res = dev_set_mac_address(rollback_slave->dev, 3753 (struct sockaddr *)&tmp_ss); 3754 if (tmp_res) { 3755 netdev_dbg(bond_dev, "unwind err %d dev %s\n", 3756 tmp_res, rollback_slave->dev->name); 3757 } 3758 } 3759 3760 return res; 3761 } 3762 3763 /** 3764 * bond_xmit_slave_id - transmit skb through slave with slave_id 3765 * @bond: bonding device that is transmitting 3766 * @skb: buffer to transmit 3767 * @slave_id: slave id up to slave_cnt-1 through which to transmit 3768 * 3769 * This function tries to transmit through slave with slave_id but in case 3770 * it fails, it tries to find the first available slave for transmission. 3771 * The skb is consumed in all cases, thus the function is void. 3772 */ 3773 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id) 3774 { 3775 struct list_head *iter; 3776 struct slave *slave; 3777 int i = slave_id; 3778 3779 /* Here we start from the slave with slave_id */ 3780 bond_for_each_slave_rcu(bond, slave, iter) { 3781 if (--i < 0) { 3782 if (bond_slave_can_tx(slave)) { 3783 bond_dev_queue_xmit(bond, skb, slave->dev); 3784 return; 3785 } 3786 } 3787 } 3788 3789 /* Here we start from the first slave up to slave_id */ 3790 i = slave_id; 3791 bond_for_each_slave_rcu(bond, slave, iter) { 3792 if (--i < 0) 3793 break; 3794 if (bond_slave_can_tx(slave)) { 3795 bond_dev_queue_xmit(bond, skb, slave->dev); 3796 return; 3797 } 3798 } 3799 /* no slave that can tx has been found */ 3800 bond_tx_drop(bond->dev, skb); 3801 } 3802 3803 /** 3804 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave 3805 * @bond: bonding device to use 3806 * 3807 * Based on the value of the bonding device's packets_per_slave parameter 3808 * this function generates a slave id, which is usually used as the next 3809 * slave to transmit through. 3810 */ 3811 static u32 bond_rr_gen_slave_id(struct bonding *bond) 3812 { 3813 u32 slave_id; 3814 struct reciprocal_value reciprocal_packets_per_slave; 3815 int packets_per_slave = bond->params.packets_per_slave; 3816 3817 switch (packets_per_slave) { 3818 case 0: 3819 slave_id = prandom_u32(); 3820 break; 3821 case 1: 3822 slave_id = bond->rr_tx_counter; 3823 break; 3824 default: 3825 reciprocal_packets_per_slave = 3826 bond->params.reciprocal_packets_per_slave; 3827 slave_id = reciprocal_divide(bond->rr_tx_counter, 3828 reciprocal_packets_per_slave); 3829 break; 3830 } 3831 bond->rr_tx_counter++; 3832 3833 return slave_id; 3834 } 3835 3836 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb, 3837 struct net_device *bond_dev) 3838 { 3839 struct bonding *bond = netdev_priv(bond_dev); 3840 struct iphdr *iph = ip_hdr(skb); 3841 struct slave *slave; 3842 u32 slave_id; 3843 3844 /* Start with the curr_active_slave that joined the bond as the 3845 * default for sending IGMP traffic. For failover purposes one 3846 * needs to maintain some consistency for the interface that will 3847 * send the join/membership reports. The curr_active_slave found 3848 * will send all of this type of traffic. 3849 */ 3850 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) { 3851 slave = rcu_dereference(bond->curr_active_slave); 3852 if (slave) 3853 bond_dev_queue_xmit(bond, skb, slave->dev); 3854 else 3855 bond_xmit_slave_id(bond, skb, 0); 3856 } else { 3857 int slave_cnt = READ_ONCE(bond->slave_cnt); 3858 3859 if (likely(slave_cnt)) { 3860 slave_id = bond_rr_gen_slave_id(bond); 3861 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt); 3862 } else { 3863 bond_tx_drop(bond_dev, skb); 3864 } 3865 } 3866 3867 return NETDEV_TX_OK; 3868 } 3869 3870 /* In active-backup mode, we know that bond->curr_active_slave is always valid if 3871 * the bond has a usable interface. 3872 */ 3873 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb, 3874 struct net_device *bond_dev) 3875 { 3876 struct bonding *bond = netdev_priv(bond_dev); 3877 struct slave *slave; 3878 3879 slave = rcu_dereference(bond->curr_active_slave); 3880 if (slave) 3881 bond_dev_queue_xmit(bond, skb, slave->dev); 3882 else 3883 bond_tx_drop(bond_dev, skb); 3884 3885 return NETDEV_TX_OK; 3886 } 3887 3888 /* Use this to update slave_array when (a) it's not appropriate to update 3889 * slave_array right away (note that update_slave_array() may sleep) 3890 * and / or (b) RTNL is not held. 3891 */ 3892 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay) 3893 { 3894 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay); 3895 } 3896 3897 /* Slave array work handler. Holds only RTNL */ 3898 static void bond_slave_arr_handler(struct work_struct *work) 3899 { 3900 struct bonding *bond = container_of(work, struct bonding, 3901 slave_arr_work.work); 3902 int ret; 3903 3904 if (!rtnl_trylock()) 3905 goto err; 3906 3907 ret = bond_update_slave_arr(bond, NULL); 3908 rtnl_unlock(); 3909 if (ret) { 3910 pr_warn_ratelimited("Failed to update slave array from WT\n"); 3911 goto err; 3912 } 3913 return; 3914 3915 err: 3916 bond_slave_arr_work_rearm(bond, 1); 3917 } 3918 3919 /* Build the usable slaves array in control path for modes that use xmit-hash 3920 * to determine the slave interface - 3921 * (a) BOND_MODE_8023AD 3922 * (b) BOND_MODE_XOR 3923 * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0 3924 * 3925 * The caller is expected to hold RTNL only and NO other lock! 3926 */ 3927 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave) 3928 { 3929 struct slave *slave; 3930 struct list_head *iter; 3931 struct bond_up_slave *new_arr, *old_arr; 3932 int agg_id = 0; 3933 int ret = 0; 3934 3935 #ifdef CONFIG_LOCKDEP 3936 WARN_ON(lockdep_is_held(&bond->mode_lock)); 3937 #endif 3938 3939 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]), 3940 GFP_KERNEL); 3941 if (!new_arr) { 3942 ret = -ENOMEM; 3943 pr_err("Failed to build slave-array.\n"); 3944 goto out; 3945 } 3946 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3947 struct ad_info ad_info; 3948 3949 if (bond_3ad_get_active_agg_info(bond, &ad_info)) { 3950 pr_debug("bond_3ad_get_active_agg_info failed\n"); 3951 kfree_rcu(new_arr, rcu); 3952 /* No active aggragator means it's not safe to use 3953 * the previous array. 3954 */ 3955 old_arr = rtnl_dereference(bond->slave_arr); 3956 if (old_arr) { 3957 RCU_INIT_POINTER(bond->slave_arr, NULL); 3958 kfree_rcu(old_arr, rcu); 3959 } 3960 goto out; 3961 } 3962 agg_id = ad_info.aggregator_id; 3963 } 3964 bond_for_each_slave(bond, slave, iter) { 3965 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3966 struct aggregator *agg; 3967 3968 agg = SLAVE_AD_INFO(slave)->port.aggregator; 3969 if (!agg || agg->aggregator_identifier != agg_id) 3970 continue; 3971 } 3972 if (!bond_slave_can_tx(slave)) 3973 continue; 3974 if (skipslave == slave) 3975 continue; 3976 3977 netdev_dbg(bond->dev, 3978 "Adding slave dev %s to tx hash array[%d]\n", 3979 slave->dev->name, new_arr->count); 3980 3981 new_arr->arr[new_arr->count++] = slave; 3982 } 3983 3984 old_arr = rtnl_dereference(bond->slave_arr); 3985 rcu_assign_pointer(bond->slave_arr, new_arr); 3986 if (old_arr) 3987 kfree_rcu(old_arr, rcu); 3988 out: 3989 if (ret != 0 && skipslave) { 3990 int idx; 3991 3992 /* Rare situation where caller has asked to skip a specific 3993 * slave but allocation failed (most likely!). BTW this is 3994 * only possible when the call is initiated from 3995 * __bond_release_one(). In this situation; overwrite the 3996 * skipslave entry in the array with the last entry from the 3997 * array to avoid a situation where the xmit path may choose 3998 * this to-be-skipped slave to send a packet out. 3999 */ 4000 old_arr = rtnl_dereference(bond->slave_arr); 4001 for (idx = 0; idx < old_arr->count; idx++) { 4002 if (skipslave == old_arr->arr[idx]) { 4003 old_arr->arr[idx] = 4004 old_arr->arr[old_arr->count-1]; 4005 old_arr->count--; 4006 break; 4007 } 4008 } 4009 } 4010 return ret; 4011 } 4012 4013 /* Use this Xmit function for 3AD as well as XOR modes. The current 4014 * usable slave array is formed in the control path. The xmit function 4015 * just calculates hash and sends the packet out. 4016 */ 4017 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb, 4018 struct net_device *dev) 4019 { 4020 struct bonding *bond = netdev_priv(dev); 4021 struct slave *slave; 4022 struct bond_up_slave *slaves; 4023 unsigned int count; 4024 4025 slaves = rcu_dereference(bond->slave_arr); 4026 count = slaves ? READ_ONCE(slaves->count) : 0; 4027 if (likely(count)) { 4028 slave = slaves->arr[bond_xmit_hash(bond, skb) % count]; 4029 bond_dev_queue_xmit(bond, skb, slave->dev); 4030 } else { 4031 bond_tx_drop(dev, skb); 4032 } 4033 4034 return NETDEV_TX_OK; 4035 } 4036 4037 /* in broadcast mode, we send everything to all usable interfaces. */ 4038 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb, 4039 struct net_device *bond_dev) 4040 { 4041 struct bonding *bond = netdev_priv(bond_dev); 4042 struct slave *slave = NULL; 4043 struct list_head *iter; 4044 4045 bond_for_each_slave_rcu(bond, slave, iter) { 4046 if (bond_is_last_slave(bond, slave)) 4047 break; 4048 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 4049 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 4050 4051 if (!skb2) { 4052 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n", 4053 bond_dev->name, __func__); 4054 continue; 4055 } 4056 bond_dev_queue_xmit(bond, skb2, slave->dev); 4057 } 4058 } 4059 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) 4060 bond_dev_queue_xmit(bond, skb, slave->dev); 4061 else 4062 bond_tx_drop(bond_dev, skb); 4063 4064 return NETDEV_TX_OK; 4065 } 4066 4067 /*------------------------- Device initialization ---------------------------*/ 4068 4069 /* Lookup the slave that corresponds to a qid */ 4070 static inline int bond_slave_override(struct bonding *bond, 4071 struct sk_buff *skb) 4072 { 4073 struct slave *slave = NULL; 4074 struct list_head *iter; 4075 4076 if (!skb_rx_queue_recorded(skb)) 4077 return 1; 4078 4079 /* Find out if any slaves have the same mapping as this skb. */ 4080 bond_for_each_slave_rcu(bond, slave, iter) { 4081 if (slave->queue_id == skb_get_queue_mapping(skb)) { 4082 if (bond_slave_is_up(slave) && 4083 slave->link == BOND_LINK_UP) { 4084 bond_dev_queue_xmit(bond, skb, slave->dev); 4085 return 0; 4086 } 4087 /* If the slave isn't UP, use default transmit policy. */ 4088 break; 4089 } 4090 } 4091 4092 return 1; 4093 } 4094 4095 4096 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb, 4097 struct net_device *sb_dev, 4098 select_queue_fallback_t fallback) 4099 { 4100 /* This helper function exists to help dev_pick_tx get the correct 4101 * destination queue. Using a helper function skips a call to 4102 * skb_tx_hash and will put the skbs in the queue we expect on their 4103 * way down to the bonding driver. 4104 */ 4105 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 4106 4107 /* Save the original txq to restore before passing to the driver */ 4108 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb); 4109 4110 if (unlikely(txq >= dev->real_num_tx_queues)) { 4111 do { 4112 txq -= dev->real_num_tx_queues; 4113 } while (txq >= dev->real_num_tx_queues); 4114 } 4115 return txq; 4116 } 4117 4118 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4119 { 4120 struct bonding *bond = netdev_priv(dev); 4121 4122 if (bond_should_override_tx_queue(bond) && 4123 !bond_slave_override(bond, skb)) 4124 return NETDEV_TX_OK; 4125 4126 switch (BOND_MODE(bond)) { 4127 case BOND_MODE_ROUNDROBIN: 4128 return bond_xmit_roundrobin(skb, dev); 4129 case BOND_MODE_ACTIVEBACKUP: 4130 return bond_xmit_activebackup(skb, dev); 4131 case BOND_MODE_8023AD: 4132 case BOND_MODE_XOR: 4133 return bond_3ad_xor_xmit(skb, dev); 4134 case BOND_MODE_BROADCAST: 4135 return bond_xmit_broadcast(skb, dev); 4136 case BOND_MODE_ALB: 4137 return bond_alb_xmit(skb, dev); 4138 case BOND_MODE_TLB: 4139 return bond_tlb_xmit(skb, dev); 4140 default: 4141 /* Should never happen, mode already checked */ 4142 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond)); 4143 WARN_ON_ONCE(1); 4144 bond_tx_drop(dev, skb); 4145 return NETDEV_TX_OK; 4146 } 4147 } 4148 4149 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4150 { 4151 struct bonding *bond = netdev_priv(dev); 4152 netdev_tx_t ret = NETDEV_TX_OK; 4153 4154 /* If we risk deadlock from transmitting this in the 4155 * netpoll path, tell netpoll to queue the frame for later tx 4156 */ 4157 if (unlikely(is_netpoll_tx_blocked(dev))) 4158 return NETDEV_TX_BUSY; 4159 4160 rcu_read_lock(); 4161 if (bond_has_slaves(bond)) 4162 ret = __bond_start_xmit(skb, dev); 4163 else 4164 bond_tx_drop(dev, skb); 4165 rcu_read_unlock(); 4166 4167 return ret; 4168 } 4169 4170 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev, 4171 struct ethtool_link_ksettings *cmd) 4172 { 4173 struct bonding *bond = netdev_priv(bond_dev); 4174 unsigned long speed = 0; 4175 struct list_head *iter; 4176 struct slave *slave; 4177 4178 cmd->base.duplex = DUPLEX_UNKNOWN; 4179 cmd->base.port = PORT_OTHER; 4180 4181 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we 4182 * do not need to check mode. Though link speed might not represent 4183 * the true receive or transmit bandwidth (not all modes are symmetric) 4184 * this is an accurate maximum. 4185 */ 4186 bond_for_each_slave(bond, slave, iter) { 4187 if (bond_slave_can_tx(slave)) { 4188 if (slave->speed != SPEED_UNKNOWN) 4189 speed += slave->speed; 4190 if (cmd->base.duplex == DUPLEX_UNKNOWN && 4191 slave->duplex != DUPLEX_UNKNOWN) 4192 cmd->base.duplex = slave->duplex; 4193 } 4194 } 4195 cmd->base.speed = speed ? : SPEED_UNKNOWN; 4196 4197 return 0; 4198 } 4199 4200 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 4201 struct ethtool_drvinfo *drvinfo) 4202 { 4203 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver)); 4204 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version)); 4205 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d", 4206 BOND_ABI_VERSION); 4207 } 4208 4209 static const struct ethtool_ops bond_ethtool_ops = { 4210 .get_drvinfo = bond_ethtool_get_drvinfo, 4211 .get_link = ethtool_op_get_link, 4212 .get_link_ksettings = bond_ethtool_get_link_ksettings, 4213 }; 4214 4215 static const struct net_device_ops bond_netdev_ops = { 4216 .ndo_init = bond_init, 4217 .ndo_uninit = bond_uninit, 4218 .ndo_open = bond_open, 4219 .ndo_stop = bond_close, 4220 .ndo_start_xmit = bond_start_xmit, 4221 .ndo_select_queue = bond_select_queue, 4222 .ndo_get_stats64 = bond_get_stats, 4223 .ndo_do_ioctl = bond_do_ioctl, 4224 .ndo_change_rx_flags = bond_change_rx_flags, 4225 .ndo_set_rx_mode = bond_set_rx_mode, 4226 .ndo_change_mtu = bond_change_mtu, 4227 .ndo_set_mac_address = bond_set_mac_address, 4228 .ndo_neigh_setup = bond_neigh_setup, 4229 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 4230 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 4231 #ifdef CONFIG_NET_POLL_CONTROLLER 4232 .ndo_netpoll_setup = bond_netpoll_setup, 4233 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 4234 .ndo_poll_controller = bond_poll_controller, 4235 #endif 4236 .ndo_add_slave = bond_enslave, 4237 .ndo_del_slave = bond_release, 4238 .ndo_fix_features = bond_fix_features, 4239 .ndo_features_check = passthru_features_check, 4240 }; 4241 4242 static const struct device_type bond_type = { 4243 .name = "bond", 4244 }; 4245 4246 static void bond_destructor(struct net_device *bond_dev) 4247 { 4248 struct bonding *bond = netdev_priv(bond_dev); 4249 if (bond->wq) 4250 destroy_workqueue(bond->wq); 4251 } 4252 4253 void bond_setup(struct net_device *bond_dev) 4254 { 4255 struct bonding *bond = netdev_priv(bond_dev); 4256 4257 spin_lock_init(&bond->mode_lock); 4258 spin_lock_init(&bond->stats_lock); 4259 bond->params = bonding_defaults; 4260 4261 /* Initialize pointers */ 4262 bond->dev = bond_dev; 4263 4264 /* Initialize the device entry points */ 4265 ether_setup(bond_dev); 4266 bond_dev->max_mtu = ETH_MAX_MTU; 4267 bond_dev->netdev_ops = &bond_netdev_ops; 4268 bond_dev->ethtool_ops = &bond_ethtool_ops; 4269 4270 bond_dev->needs_free_netdev = true; 4271 bond_dev->priv_destructor = bond_destructor; 4272 4273 SET_NETDEV_DEVTYPE(bond_dev, &bond_type); 4274 4275 /* Initialize the device options */ 4276 bond_dev->flags |= IFF_MASTER; 4277 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE; 4278 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 4279 4280 /* don't acquire bond device's netif_tx_lock when transmitting */ 4281 bond_dev->features |= NETIF_F_LLTX; 4282 4283 /* By default, we declare the bond to be fully 4284 * VLAN hardware accelerated capable. Special 4285 * care is taken in the various xmit functions 4286 * when there are slaves that are not hw accel 4287 * capable 4288 */ 4289 4290 /* Don't allow bond devices to change network namespaces. */ 4291 bond_dev->features |= NETIF_F_NETNS_LOCAL; 4292 4293 bond_dev->hw_features = BOND_VLAN_FEATURES | 4294 NETIF_F_HW_VLAN_CTAG_TX | 4295 NETIF_F_HW_VLAN_CTAG_RX | 4296 NETIF_F_HW_VLAN_CTAG_FILTER; 4297 4298 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL | NETIF_F_GSO_UDP_L4; 4299 bond_dev->features |= bond_dev->hw_features; 4300 } 4301 4302 /* Destroy a bonding device. 4303 * Must be under rtnl_lock when this function is called. 4304 */ 4305 static void bond_uninit(struct net_device *bond_dev) 4306 { 4307 struct bonding *bond = netdev_priv(bond_dev); 4308 struct list_head *iter; 4309 struct slave *slave; 4310 struct bond_up_slave *arr; 4311 4312 bond_netpoll_cleanup(bond_dev); 4313 4314 /* Release the bonded slaves */ 4315 bond_for_each_slave(bond, slave, iter) 4316 __bond_release_one(bond_dev, slave->dev, true, true); 4317 netdev_info(bond_dev, "Released all slaves\n"); 4318 4319 arr = rtnl_dereference(bond->slave_arr); 4320 if (arr) { 4321 RCU_INIT_POINTER(bond->slave_arr, NULL); 4322 kfree_rcu(arr, rcu); 4323 } 4324 4325 list_del(&bond->bond_list); 4326 4327 bond_debug_unregister(bond); 4328 } 4329 4330 /*------------------------- Module initialization ---------------------------*/ 4331 4332 static int bond_check_params(struct bond_params *params) 4333 { 4334 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i; 4335 struct bond_opt_value newval; 4336 const struct bond_opt_value *valptr; 4337 int arp_all_targets_value = 0; 4338 u16 ad_actor_sys_prio = 0; 4339 u16 ad_user_port_key = 0; 4340 __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 }; 4341 int arp_ip_count; 4342 int bond_mode = BOND_MODE_ROUNDROBIN; 4343 int xmit_hashtype = BOND_XMIT_POLICY_LAYER2; 4344 int lacp_fast = 0; 4345 int tlb_dynamic_lb; 4346 4347 /* Convert string parameters. */ 4348 if (mode) { 4349 bond_opt_initstr(&newval, mode); 4350 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval); 4351 if (!valptr) { 4352 pr_err("Error: Invalid bonding mode \"%s\"\n", mode); 4353 return -EINVAL; 4354 } 4355 bond_mode = valptr->value; 4356 } 4357 4358 if (xmit_hash_policy) { 4359 if (bond_mode == BOND_MODE_ROUNDROBIN || 4360 bond_mode == BOND_MODE_ACTIVEBACKUP || 4361 bond_mode == BOND_MODE_BROADCAST) { 4362 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 4363 bond_mode_name(bond_mode)); 4364 } else { 4365 bond_opt_initstr(&newval, xmit_hash_policy); 4366 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH), 4367 &newval); 4368 if (!valptr) { 4369 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 4370 xmit_hash_policy); 4371 return -EINVAL; 4372 } 4373 xmit_hashtype = valptr->value; 4374 } 4375 } 4376 4377 if (lacp_rate) { 4378 if (bond_mode != BOND_MODE_8023AD) { 4379 pr_info("lacp_rate param is irrelevant in mode %s\n", 4380 bond_mode_name(bond_mode)); 4381 } else { 4382 bond_opt_initstr(&newval, lacp_rate); 4383 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE), 4384 &newval); 4385 if (!valptr) { 4386 pr_err("Error: Invalid lacp rate \"%s\"\n", 4387 lacp_rate); 4388 return -EINVAL; 4389 } 4390 lacp_fast = valptr->value; 4391 } 4392 } 4393 4394 if (ad_select) { 4395 bond_opt_initstr(&newval, ad_select); 4396 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT), 4397 &newval); 4398 if (!valptr) { 4399 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select); 4400 return -EINVAL; 4401 } 4402 params->ad_select = valptr->value; 4403 if (bond_mode != BOND_MODE_8023AD) 4404 pr_warn("ad_select param only affects 802.3ad mode\n"); 4405 } else { 4406 params->ad_select = BOND_AD_STABLE; 4407 } 4408 4409 if (max_bonds < 0) { 4410 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 4411 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 4412 max_bonds = BOND_DEFAULT_MAX_BONDS; 4413 } 4414 4415 if (miimon < 0) { 4416 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4417 miimon, INT_MAX); 4418 miimon = 0; 4419 } 4420 4421 if (updelay < 0) { 4422 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4423 updelay, INT_MAX); 4424 updelay = 0; 4425 } 4426 4427 if (downdelay < 0) { 4428 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4429 downdelay, INT_MAX); 4430 downdelay = 0; 4431 } 4432 4433 if ((use_carrier != 0) && (use_carrier != 1)) { 4434 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 4435 use_carrier); 4436 use_carrier = 1; 4437 } 4438 4439 if (num_peer_notif < 0 || num_peer_notif > 255) { 4440 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 4441 num_peer_notif); 4442 num_peer_notif = 1; 4443 } 4444 4445 /* reset values for 802.3ad/TLB/ALB */ 4446 if (!bond_mode_uses_arp(bond_mode)) { 4447 if (!miimon) { 4448 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"); 4449 pr_warn("Forcing miimon to 100msec\n"); 4450 miimon = BOND_DEFAULT_MIIMON; 4451 } 4452 } 4453 4454 if (tx_queues < 1 || tx_queues > 255) { 4455 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n", 4456 tx_queues, BOND_DEFAULT_TX_QUEUES); 4457 tx_queues = BOND_DEFAULT_TX_QUEUES; 4458 } 4459 4460 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 4461 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n", 4462 all_slaves_active); 4463 all_slaves_active = 0; 4464 } 4465 4466 if (resend_igmp < 0 || resend_igmp > 255) { 4467 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n", 4468 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 4469 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 4470 } 4471 4472 bond_opt_initval(&newval, packets_per_slave); 4473 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) { 4474 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n", 4475 packets_per_slave, USHRT_MAX); 4476 packets_per_slave = 1; 4477 } 4478 4479 if (bond_mode == BOND_MODE_ALB) { 4480 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", 4481 updelay); 4482 } 4483 4484 if (!miimon) { 4485 if (updelay || downdelay) { 4486 /* just warn the user the up/down delay will have 4487 * no effect since miimon is zero... 4488 */ 4489 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", 4490 updelay, downdelay); 4491 } 4492 } else { 4493 /* don't allow arp monitoring */ 4494 if (arp_interval) { 4495 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 4496 miimon, arp_interval); 4497 arp_interval = 0; 4498 } 4499 4500 if ((updelay % miimon) != 0) { 4501 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 4502 updelay, miimon, (updelay / miimon) * miimon); 4503 } 4504 4505 updelay /= miimon; 4506 4507 if ((downdelay % miimon) != 0) { 4508 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 4509 downdelay, miimon, 4510 (downdelay / miimon) * miimon); 4511 } 4512 4513 downdelay /= miimon; 4514 } 4515 4516 if (arp_interval < 0) { 4517 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4518 arp_interval, INT_MAX); 4519 arp_interval = 0; 4520 } 4521 4522 for (arp_ip_count = 0, i = 0; 4523 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) { 4524 __be32 ip; 4525 4526 /* not a complete check, but good enough to catch mistakes */ 4527 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) || 4528 !bond_is_ip_target_ok(ip)) { 4529 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 4530 arp_ip_target[i]); 4531 arp_interval = 0; 4532 } else { 4533 if (bond_get_targets_ip(arp_target, ip) == -1) 4534 arp_target[arp_ip_count++] = ip; 4535 else 4536 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n", 4537 &ip); 4538 } 4539 } 4540 4541 if (arp_interval && !arp_ip_count) { 4542 /* don't allow arping if no arp_ip_target given... */ 4543 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 4544 arp_interval); 4545 arp_interval = 0; 4546 } 4547 4548 if (arp_validate) { 4549 if (!arp_interval) { 4550 pr_err("arp_validate requires arp_interval\n"); 4551 return -EINVAL; 4552 } 4553 4554 bond_opt_initstr(&newval, arp_validate); 4555 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE), 4556 &newval); 4557 if (!valptr) { 4558 pr_err("Error: invalid arp_validate \"%s\"\n", 4559 arp_validate); 4560 return -EINVAL; 4561 } 4562 arp_validate_value = valptr->value; 4563 } else { 4564 arp_validate_value = 0; 4565 } 4566 4567 if (arp_all_targets) { 4568 bond_opt_initstr(&newval, arp_all_targets); 4569 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS), 4570 &newval); 4571 if (!valptr) { 4572 pr_err("Error: invalid arp_all_targets_value \"%s\"\n", 4573 arp_all_targets); 4574 arp_all_targets_value = 0; 4575 } else { 4576 arp_all_targets_value = valptr->value; 4577 } 4578 } 4579 4580 if (miimon) { 4581 pr_info("MII link monitoring set to %d ms\n", miimon); 4582 } else if (arp_interval) { 4583 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE, 4584 arp_validate_value); 4585 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 4586 arp_interval, valptr->string, arp_ip_count); 4587 4588 for (i = 0; i < arp_ip_count; i++) 4589 pr_cont(" %s", arp_ip_target[i]); 4590 4591 pr_cont("\n"); 4592 4593 } else if (max_bonds) { 4594 /* miimon and arp_interval not set, we need one so things 4595 * work as expected, see bonding.txt for details 4596 */ 4597 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"); 4598 } 4599 4600 if (primary && !bond_mode_uses_primary(bond_mode)) { 4601 /* currently, using a primary only makes sense 4602 * in active backup, TLB or ALB modes 4603 */ 4604 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n", 4605 primary, bond_mode_name(bond_mode)); 4606 primary = NULL; 4607 } 4608 4609 if (primary && primary_reselect) { 4610 bond_opt_initstr(&newval, primary_reselect); 4611 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT), 4612 &newval); 4613 if (!valptr) { 4614 pr_err("Error: Invalid primary_reselect \"%s\"\n", 4615 primary_reselect); 4616 return -EINVAL; 4617 } 4618 primary_reselect_value = valptr->value; 4619 } else { 4620 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 4621 } 4622 4623 if (fail_over_mac) { 4624 bond_opt_initstr(&newval, fail_over_mac); 4625 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC), 4626 &newval); 4627 if (!valptr) { 4628 pr_err("Error: invalid fail_over_mac \"%s\"\n", 4629 fail_over_mac); 4630 return -EINVAL; 4631 } 4632 fail_over_mac_value = valptr->value; 4633 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 4634 pr_warn("Warning: fail_over_mac only affects active-backup mode\n"); 4635 } else { 4636 fail_over_mac_value = BOND_FOM_NONE; 4637 } 4638 4639 bond_opt_initstr(&newval, "default"); 4640 valptr = bond_opt_parse( 4641 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO), 4642 &newval); 4643 if (!valptr) { 4644 pr_err("Error: No ad_actor_sys_prio default value"); 4645 return -EINVAL; 4646 } 4647 ad_actor_sys_prio = valptr->value; 4648 4649 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY), 4650 &newval); 4651 if (!valptr) { 4652 pr_err("Error: No ad_user_port_key default value"); 4653 return -EINVAL; 4654 } 4655 ad_user_port_key = valptr->value; 4656 4657 bond_opt_initstr(&newval, "default"); 4658 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval); 4659 if (!valptr) { 4660 pr_err("Error: No tlb_dynamic_lb default value"); 4661 return -EINVAL; 4662 } 4663 tlb_dynamic_lb = valptr->value; 4664 4665 if (lp_interval == 0) { 4666 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n", 4667 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL); 4668 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 4669 } 4670 4671 /* fill params struct with the proper values */ 4672 params->mode = bond_mode; 4673 params->xmit_policy = xmit_hashtype; 4674 params->miimon = miimon; 4675 params->num_peer_notif = num_peer_notif; 4676 params->arp_interval = arp_interval; 4677 params->arp_validate = arp_validate_value; 4678 params->arp_all_targets = arp_all_targets_value; 4679 params->updelay = updelay; 4680 params->downdelay = downdelay; 4681 params->use_carrier = use_carrier; 4682 params->lacp_fast = lacp_fast; 4683 params->primary[0] = 0; 4684 params->primary_reselect = primary_reselect_value; 4685 params->fail_over_mac = fail_over_mac_value; 4686 params->tx_queues = tx_queues; 4687 params->all_slaves_active = all_slaves_active; 4688 params->resend_igmp = resend_igmp; 4689 params->min_links = min_links; 4690 params->lp_interval = lp_interval; 4691 params->packets_per_slave = packets_per_slave; 4692 params->tlb_dynamic_lb = tlb_dynamic_lb; 4693 params->ad_actor_sys_prio = ad_actor_sys_prio; 4694 eth_zero_addr(params->ad_actor_system); 4695 params->ad_user_port_key = ad_user_port_key; 4696 if (packets_per_slave > 0) { 4697 params->reciprocal_packets_per_slave = 4698 reciprocal_value(packets_per_slave); 4699 } else { 4700 /* reciprocal_packets_per_slave is unused if 4701 * packets_per_slave is 0 or 1, just initialize it 4702 */ 4703 params->reciprocal_packets_per_slave = 4704 (struct reciprocal_value) { 0 }; 4705 } 4706 4707 if (primary) { 4708 strncpy(params->primary, primary, IFNAMSIZ); 4709 params->primary[IFNAMSIZ - 1] = 0; 4710 } 4711 4712 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 4713 4714 return 0; 4715 } 4716 4717 /* Called from registration process */ 4718 static int bond_init(struct net_device *bond_dev) 4719 { 4720 struct bonding *bond = netdev_priv(bond_dev); 4721 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 4722 4723 netdev_dbg(bond_dev, "Begin bond_init\n"); 4724 4725 bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM); 4726 if (!bond->wq) 4727 return -ENOMEM; 4728 4729 netdev_lockdep_set_classes(bond_dev); 4730 4731 list_add_tail(&bond->bond_list, &bn->dev_list); 4732 4733 bond_prepare_sysfs_group(bond); 4734 4735 bond_debug_register(bond); 4736 4737 /* Ensure valid dev_addr */ 4738 if (is_zero_ether_addr(bond_dev->dev_addr) && 4739 bond_dev->addr_assign_type == NET_ADDR_PERM) 4740 eth_hw_addr_random(bond_dev); 4741 4742 return 0; 4743 } 4744 4745 unsigned int bond_get_num_tx_queues(void) 4746 { 4747 return tx_queues; 4748 } 4749 4750 /* Create a new bond based on the specified name and bonding parameters. 4751 * If name is NULL, obtain a suitable "bond%d" name for us. 4752 * Caller must NOT hold rtnl_lock; we need to release it here before we 4753 * set up our sysfs entries. 4754 */ 4755 int bond_create(struct net *net, const char *name) 4756 { 4757 struct net_device *bond_dev; 4758 struct bonding *bond; 4759 struct alb_bond_info *bond_info; 4760 int res; 4761 4762 rtnl_lock(); 4763 4764 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 4765 name ? name : "bond%d", NET_NAME_UNKNOWN, 4766 bond_setup, tx_queues); 4767 if (!bond_dev) { 4768 pr_err("%s: eek! can't alloc netdev!\n", name); 4769 rtnl_unlock(); 4770 return -ENOMEM; 4771 } 4772 4773 /* 4774 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX. 4775 * It is set to 0 by default which is wrong. 4776 */ 4777 bond = netdev_priv(bond_dev); 4778 bond_info = &(BOND_ALB_INFO(bond)); 4779 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; 4780 4781 dev_net_set(bond_dev, net); 4782 bond_dev->rtnl_link_ops = &bond_link_ops; 4783 4784 res = register_netdevice(bond_dev); 4785 4786 netif_carrier_off(bond_dev); 4787 4788 bond_work_init_all(bond); 4789 4790 rtnl_unlock(); 4791 if (res < 0) 4792 free_netdev(bond_dev); 4793 return res; 4794 } 4795 4796 static int __net_init bond_net_init(struct net *net) 4797 { 4798 struct bond_net *bn = net_generic(net, bond_net_id); 4799 4800 bn->net = net; 4801 INIT_LIST_HEAD(&bn->dev_list); 4802 4803 bond_create_proc_dir(bn); 4804 bond_create_sysfs(bn); 4805 4806 return 0; 4807 } 4808 4809 static void __net_exit bond_net_exit(struct net *net) 4810 { 4811 struct bond_net *bn = net_generic(net, bond_net_id); 4812 struct bonding *bond, *tmp_bond; 4813 LIST_HEAD(list); 4814 4815 bond_destroy_sysfs(bn); 4816 4817 /* Kill off any bonds created after unregistering bond rtnl ops */ 4818 rtnl_lock(); 4819 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list) 4820 unregister_netdevice_queue(bond->dev, &list); 4821 unregister_netdevice_many(&list); 4822 rtnl_unlock(); 4823 4824 bond_destroy_proc_dir(bn); 4825 } 4826 4827 static struct pernet_operations bond_net_ops = { 4828 .init = bond_net_init, 4829 .exit = bond_net_exit, 4830 .id = &bond_net_id, 4831 .size = sizeof(struct bond_net), 4832 }; 4833 4834 static int __init bonding_init(void) 4835 { 4836 int i; 4837 int res; 4838 4839 pr_info("%s", bond_version); 4840 4841 res = bond_check_params(&bonding_defaults); 4842 if (res) 4843 goto out; 4844 4845 res = register_pernet_subsys(&bond_net_ops); 4846 if (res) 4847 goto out; 4848 4849 res = bond_netlink_init(); 4850 if (res) 4851 goto err_link; 4852 4853 bond_create_debugfs(); 4854 4855 for (i = 0; i < max_bonds; i++) { 4856 res = bond_create(&init_net, NULL); 4857 if (res) 4858 goto err; 4859 } 4860 4861 register_netdevice_notifier(&bond_netdev_notifier); 4862 out: 4863 return res; 4864 err: 4865 bond_destroy_debugfs(); 4866 bond_netlink_fini(); 4867 err_link: 4868 unregister_pernet_subsys(&bond_net_ops); 4869 goto out; 4870 4871 } 4872 4873 static void __exit bonding_exit(void) 4874 { 4875 unregister_netdevice_notifier(&bond_netdev_notifier); 4876 4877 bond_destroy_debugfs(); 4878 4879 bond_netlink_fini(); 4880 unregister_pernet_subsys(&bond_net_ops); 4881 4882 #ifdef CONFIG_NET_POLL_CONTROLLER 4883 /* Make sure we don't have an imbalance on our netpoll blocking */ 4884 WARN_ON(atomic_read(&netpoll_block_tx)); 4885 #endif 4886 } 4887 4888 module_init(bonding_init); 4889 module_exit(bonding_exit); 4890 MODULE_LICENSE("GPL"); 4891 MODULE_VERSION(DRV_VERSION); 4892 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION); 4893 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 4894