1 /* 2 * originally based on the dummy device. 3 * 4 * Copyright 1999, Thomas Davis, tadavis@lbl.gov. 5 * Licensed under the GPL. Based on dummy.c, and eql.c devices. 6 * 7 * bonding.c: an Ethernet Bonding driver 8 * 9 * This is useful to talk to a Cisco EtherChannel compatible equipment: 10 * Cisco 5500 11 * Sun Trunking (Solaris) 12 * Alteon AceDirector Trunks 13 * Linux Bonding 14 * and probably many L2 switches ... 15 * 16 * How it works: 17 * ifconfig bond0 ipaddress netmask up 18 * will setup a network device, with an ip address. No mac address 19 * will be assigned at this time. The hw mac address will come from 20 * the first slave bonded to the channel. All slaves will then use 21 * this hw mac address. 22 * 23 * ifconfig bond0 down 24 * will release all slaves, marking them as down. 25 * 26 * ifenslave bond0 eth0 27 * will attach eth0 to bond0 as a slave. eth0 hw mac address will either 28 * a: be used as initial mac address 29 * b: if a hw mac address already is there, eth0's hw mac address 30 * will then be set from bond0. 31 * 32 */ 33 34 #include <linux/kernel.h> 35 #include <linux/module.h> 36 #include <linux/types.h> 37 #include <linux/fcntl.h> 38 #include <linux/interrupt.h> 39 #include <linux/ptrace.h> 40 #include <linux/ioport.h> 41 #include <linux/in.h> 42 #include <net/ip.h> 43 #include <linux/ip.h> 44 #include <linux/tcp.h> 45 #include <linux/udp.h> 46 #include <linux/slab.h> 47 #include <linux/string.h> 48 #include <linux/init.h> 49 #include <linux/timer.h> 50 #include <linux/socket.h> 51 #include <linux/ctype.h> 52 #include <linux/inet.h> 53 #include <linux/bitops.h> 54 #include <linux/io.h> 55 #include <asm/dma.h> 56 #include <linux/uaccess.h> 57 #include <linux/errno.h> 58 #include <linux/netdevice.h> 59 #include <linux/inetdevice.h> 60 #include <linux/igmp.h> 61 #include <linux/etherdevice.h> 62 #include <linux/skbuff.h> 63 #include <net/sock.h> 64 #include <linux/rtnetlink.h> 65 #include <linux/smp.h> 66 #include <linux/if_ether.h> 67 #include <net/arp.h> 68 #include <linux/mii.h> 69 #include <linux/ethtool.h> 70 #include <linux/if_vlan.h> 71 #include <linux/if_bonding.h> 72 #include <linux/jiffies.h> 73 #include <linux/preempt.h> 74 #include <net/route.h> 75 #include <net/net_namespace.h> 76 #include <net/netns/generic.h> 77 #include <net/pkt_sched.h> 78 #include <linux/rculist.h> 79 #include <net/flow_dissector.h> 80 #include <net/switchdev.h> 81 #include <net/bonding.h> 82 #include <net/bond_3ad.h> 83 #include <net/bond_alb.h> 84 85 #include "bonding_priv.h" 86 87 /*---------------------------- Module parameters ----------------------------*/ 88 89 /* monitor all links that often (in milliseconds). <=0 disables monitoring */ 90 91 static int max_bonds = BOND_DEFAULT_MAX_BONDS; 92 static int tx_queues = BOND_DEFAULT_TX_QUEUES; 93 static int num_peer_notif = 1; 94 static int miimon; 95 static int updelay; 96 static int downdelay; 97 static int use_carrier = 1; 98 static char *mode; 99 static char *primary; 100 static char *primary_reselect; 101 static char *lacp_rate; 102 static int min_links; 103 static char *ad_select; 104 static char *xmit_hash_policy; 105 static int arp_interval; 106 static char *arp_ip_target[BOND_MAX_ARP_TARGETS]; 107 static char *arp_validate; 108 static char *arp_all_targets; 109 static char *fail_over_mac; 110 static int all_slaves_active; 111 static struct bond_params bonding_defaults; 112 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP; 113 static int packets_per_slave = 1; 114 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 115 116 module_param(max_bonds, int, 0); 117 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices"); 118 module_param(tx_queues, int, 0); 119 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)"); 120 module_param_named(num_grat_arp, num_peer_notif, int, 0644); 121 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on " 122 "failover event (alias of num_unsol_na)"); 123 module_param_named(num_unsol_na, num_peer_notif, int, 0644); 124 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on " 125 "failover event (alias of num_grat_arp)"); 126 module_param(miimon, int, 0); 127 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds"); 128 module_param(updelay, int, 0); 129 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds"); 130 module_param(downdelay, int, 0); 131 MODULE_PARM_DESC(downdelay, "Delay before considering link down, " 132 "in milliseconds"); 133 module_param(use_carrier, int, 0); 134 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; " 135 "0 for off, 1 for on (default)"); 136 module_param(mode, charp, 0); 137 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, " 138 "1 for active-backup, 2 for balance-xor, " 139 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, " 140 "6 for balance-alb"); 141 module_param(primary, charp, 0); 142 MODULE_PARM_DESC(primary, "Primary network device to use"); 143 module_param(primary_reselect, charp, 0); 144 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave " 145 "once it comes up; " 146 "0 for always (default), " 147 "1 for only if speed of primary is " 148 "better, " 149 "2 for only on active slave " 150 "failure"); 151 module_param(lacp_rate, charp, 0); 152 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; " 153 "0 for slow, 1 for fast"); 154 module_param(ad_select, charp, 0); 155 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; " 156 "0 for stable (default), 1 for bandwidth, " 157 "2 for count"); 158 module_param(min_links, int, 0); 159 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier"); 160 161 module_param(xmit_hash_policy, charp, 0); 162 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; " 163 "0 for layer 2 (default), 1 for layer 3+4, " 164 "2 for layer 2+3, 3 for encap layer 2+3, " 165 "4 for encap layer 3+4"); 166 module_param(arp_interval, int, 0); 167 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds"); 168 module_param_array(arp_ip_target, charp, NULL, 0); 169 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form"); 170 module_param(arp_validate, charp, 0); 171 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; " 172 "0 for none (default), 1 for active, " 173 "2 for backup, 3 for all"); 174 module_param(arp_all_targets, charp, 0); 175 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all"); 176 module_param(fail_over_mac, charp, 0); 177 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to " 178 "the same MAC; 0 for none (default), " 179 "1 for active, 2 for follow"); 180 module_param(all_slaves_active, int, 0); 181 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface " 182 "by setting active flag for all slaves; " 183 "0 for never (default), 1 for always."); 184 module_param(resend_igmp, int, 0); 185 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on " 186 "link failure"); 187 module_param(packets_per_slave, int, 0); 188 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr " 189 "mode; 0 for a random slave, 1 packet per " 190 "slave (default), >1 packets per slave."); 191 module_param(lp_interval, uint, 0); 192 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where " 193 "the bonding driver sends learning packets to " 194 "each slaves peer switch. The default is 1."); 195 196 /*----------------------------- Global variables ----------------------------*/ 197 198 #ifdef CONFIG_NET_POLL_CONTROLLER 199 atomic_t netpoll_block_tx = ATOMIC_INIT(0); 200 #endif 201 202 int bond_net_id __read_mostly; 203 204 static __be32 arp_target[BOND_MAX_ARP_TARGETS]; 205 static int arp_ip_count; 206 static int bond_mode = BOND_MODE_ROUNDROBIN; 207 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2; 208 static int lacp_fast; 209 210 /*-------------------------- Forward declarations ---------------------------*/ 211 212 static int bond_init(struct net_device *bond_dev); 213 static void bond_uninit(struct net_device *bond_dev); 214 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev, 215 struct rtnl_link_stats64 *stats); 216 static void bond_slave_arr_handler(struct work_struct *work); 217 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 218 int mod); 219 220 /*---------------------------- General routines -----------------------------*/ 221 222 const char *bond_mode_name(int mode) 223 { 224 static const char *names[] = { 225 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)", 226 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)", 227 [BOND_MODE_XOR] = "load balancing (xor)", 228 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)", 229 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation", 230 [BOND_MODE_TLB] = "transmit load balancing", 231 [BOND_MODE_ALB] = "adaptive load balancing", 232 }; 233 234 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB) 235 return "unknown"; 236 237 return names[mode]; 238 } 239 240 /*---------------------------------- VLAN -----------------------------------*/ 241 242 /** 243 * bond_dev_queue_xmit - Prepare skb for xmit. 244 * 245 * @bond: bond device that got this skb for tx. 246 * @skb: hw accel VLAN tagged skb to transmit 247 * @slave_dev: slave that is supposed to xmit this skbuff 248 */ 249 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, 250 struct net_device *slave_dev) 251 { 252 skb->dev = slave_dev; 253 254 BUILD_BUG_ON(sizeof(skb->queue_mapping) != 255 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping)); 256 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping; 257 258 if (unlikely(netpoll_tx_running(bond->dev))) 259 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb); 260 else 261 dev_queue_xmit(skb); 262 } 263 264 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid, 265 * We don't protect the slave list iteration with a lock because: 266 * a. This operation is performed in IOCTL context, 267 * b. The operation is protected by the RTNL semaphore in the 8021q code, 268 * c. Holding a lock with BH disabled while directly calling a base driver 269 * entry point is generally a BAD idea. 270 * 271 * The design of synchronization/protection for this operation in the 8021q 272 * module is good for one or more VLAN devices over a single physical device 273 * and cannot be extended for a teaming solution like bonding, so there is a 274 * potential race condition here where a net device from the vlan group might 275 * be referenced (either by a base driver or the 8021q code) while it is being 276 * removed from the system. However, it turns out we're not making matters 277 * worse, and if it works for regular VLAN usage it will work here too. 278 */ 279 280 /** 281 * bond_vlan_rx_add_vid - Propagates adding an id to slaves 282 * @bond_dev: bonding net device that got called 283 * @vid: vlan id being added 284 */ 285 static int bond_vlan_rx_add_vid(struct net_device *bond_dev, 286 __be16 proto, u16 vid) 287 { 288 struct bonding *bond = netdev_priv(bond_dev); 289 struct slave *slave, *rollback_slave; 290 struct list_head *iter; 291 int res; 292 293 bond_for_each_slave(bond, slave, iter) { 294 res = vlan_vid_add(slave->dev, proto, vid); 295 if (res) 296 goto unwind; 297 } 298 299 return 0; 300 301 unwind: 302 /* unwind to the slave that failed */ 303 bond_for_each_slave(bond, rollback_slave, iter) { 304 if (rollback_slave == slave) 305 break; 306 307 vlan_vid_del(rollback_slave->dev, proto, vid); 308 } 309 310 return res; 311 } 312 313 /** 314 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves 315 * @bond_dev: bonding net device that got called 316 * @vid: vlan id being removed 317 */ 318 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, 319 __be16 proto, u16 vid) 320 { 321 struct bonding *bond = netdev_priv(bond_dev); 322 struct list_head *iter; 323 struct slave *slave; 324 325 bond_for_each_slave(bond, slave, iter) 326 vlan_vid_del(slave->dev, proto, vid); 327 328 if (bond_is_lb(bond)) 329 bond_alb_clear_vlan(bond, vid); 330 331 return 0; 332 } 333 334 /*------------------------------- Link status -------------------------------*/ 335 336 /* Set the carrier state for the master according to the state of its 337 * slaves. If any slaves are up, the master is up. In 802.3ad mode, 338 * do special 802.3ad magic. 339 * 340 * Returns zero if carrier state does not change, nonzero if it does. 341 */ 342 int bond_set_carrier(struct bonding *bond) 343 { 344 struct list_head *iter; 345 struct slave *slave; 346 347 if (!bond_has_slaves(bond)) 348 goto down; 349 350 if (BOND_MODE(bond) == BOND_MODE_8023AD) 351 return bond_3ad_set_carrier(bond); 352 353 bond_for_each_slave(bond, slave, iter) { 354 if (slave->link == BOND_LINK_UP) { 355 if (!netif_carrier_ok(bond->dev)) { 356 netif_carrier_on(bond->dev); 357 return 1; 358 } 359 return 0; 360 } 361 } 362 363 down: 364 if (netif_carrier_ok(bond->dev)) { 365 netif_carrier_off(bond->dev); 366 return 1; 367 } 368 return 0; 369 } 370 371 /* Get link speed and duplex from the slave's base driver 372 * using ethtool. If for some reason the call fails or the 373 * values are invalid, set speed and duplex to -1, 374 * and return. 375 */ 376 static void bond_update_speed_duplex(struct slave *slave) 377 { 378 struct net_device *slave_dev = slave->dev; 379 struct ethtool_cmd ecmd; 380 u32 slave_speed; 381 int res; 382 383 slave->speed = SPEED_UNKNOWN; 384 slave->duplex = DUPLEX_UNKNOWN; 385 386 res = __ethtool_get_settings(slave_dev, &ecmd); 387 if (res < 0) 388 return; 389 390 slave_speed = ethtool_cmd_speed(&ecmd); 391 if (slave_speed == 0 || slave_speed == ((__u32) -1)) 392 return; 393 394 switch (ecmd.duplex) { 395 case DUPLEX_FULL: 396 case DUPLEX_HALF: 397 break; 398 default: 399 return; 400 } 401 402 slave->speed = slave_speed; 403 slave->duplex = ecmd.duplex; 404 405 return; 406 } 407 408 const char *bond_slave_link_status(s8 link) 409 { 410 switch (link) { 411 case BOND_LINK_UP: 412 return "up"; 413 case BOND_LINK_FAIL: 414 return "going down"; 415 case BOND_LINK_DOWN: 416 return "down"; 417 case BOND_LINK_BACK: 418 return "going back"; 419 default: 420 return "unknown"; 421 } 422 } 423 424 /* if <dev> supports MII link status reporting, check its link status. 425 * 426 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), 427 * depending upon the setting of the use_carrier parameter. 428 * 429 * Return either BMSR_LSTATUS, meaning that the link is up (or we 430 * can't tell and just pretend it is), or 0, meaning that the link is 431 * down. 432 * 433 * If reporting is non-zero, instead of faking link up, return -1 if 434 * both ETHTOOL and MII ioctls fail (meaning the device does not 435 * support them). If use_carrier is set, return whatever it says. 436 * It'd be nice if there was a good way to tell if a driver supports 437 * netif_carrier, but there really isn't. 438 */ 439 static int bond_check_dev_link(struct bonding *bond, 440 struct net_device *slave_dev, int reporting) 441 { 442 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 443 int (*ioctl)(struct net_device *, struct ifreq *, int); 444 struct ifreq ifr; 445 struct mii_ioctl_data *mii; 446 447 if (!reporting && !netif_running(slave_dev)) 448 return 0; 449 450 if (bond->params.use_carrier) 451 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; 452 453 /* Try to get link status using Ethtool first. */ 454 if (slave_dev->ethtool_ops->get_link) 455 return slave_dev->ethtool_ops->get_link(slave_dev) ? 456 BMSR_LSTATUS : 0; 457 458 /* Ethtool can't be used, fallback to MII ioctls. */ 459 ioctl = slave_ops->ndo_do_ioctl; 460 if (ioctl) { 461 /* TODO: set pointer to correct ioctl on a per team member 462 * bases to make this more efficient. that is, once 463 * we determine the correct ioctl, we will always 464 * call it and not the others for that team 465 * member. 466 */ 467 468 /* We cannot assume that SIOCGMIIPHY will also read a 469 * register; not all network drivers (e.g., e100) 470 * support that. 471 */ 472 473 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ 474 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ); 475 mii = if_mii(&ifr); 476 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) { 477 mii->reg_num = MII_BMSR; 478 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) 479 return mii->val_out & BMSR_LSTATUS; 480 } 481 } 482 483 /* If reporting, report that either there's no dev->do_ioctl, 484 * or both SIOCGMIIREG and get_link failed (meaning that we 485 * cannot report link status). If not reporting, pretend 486 * we're ok. 487 */ 488 return reporting ? -1 : BMSR_LSTATUS; 489 } 490 491 /*----------------------------- Multicast list ------------------------------*/ 492 493 /* Push the promiscuity flag down to appropriate slaves */ 494 static int bond_set_promiscuity(struct bonding *bond, int inc) 495 { 496 struct list_head *iter; 497 int err = 0; 498 499 if (bond_uses_primary(bond)) { 500 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 501 502 if (curr_active) 503 err = dev_set_promiscuity(curr_active->dev, inc); 504 } else { 505 struct slave *slave; 506 507 bond_for_each_slave(bond, slave, iter) { 508 err = dev_set_promiscuity(slave->dev, inc); 509 if (err) 510 return err; 511 } 512 } 513 return err; 514 } 515 516 /* Push the allmulti flag down to all slaves */ 517 static int bond_set_allmulti(struct bonding *bond, int inc) 518 { 519 struct list_head *iter; 520 int err = 0; 521 522 if (bond_uses_primary(bond)) { 523 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 524 525 if (curr_active) 526 err = dev_set_allmulti(curr_active->dev, inc); 527 } else { 528 struct slave *slave; 529 530 bond_for_each_slave(bond, slave, iter) { 531 err = dev_set_allmulti(slave->dev, inc); 532 if (err) 533 return err; 534 } 535 } 536 return err; 537 } 538 539 /* Retrieve the list of registered multicast addresses for the bonding 540 * device and retransmit an IGMP JOIN request to the current active 541 * slave. 542 */ 543 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work) 544 { 545 struct bonding *bond = container_of(work, struct bonding, 546 mcast_work.work); 547 548 if (!rtnl_trylock()) { 549 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 550 return; 551 } 552 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev); 553 554 if (bond->igmp_retrans > 1) { 555 bond->igmp_retrans--; 556 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); 557 } 558 rtnl_unlock(); 559 } 560 561 /* Flush bond's hardware addresses from slave */ 562 static void bond_hw_addr_flush(struct net_device *bond_dev, 563 struct net_device *slave_dev) 564 { 565 struct bonding *bond = netdev_priv(bond_dev); 566 567 dev_uc_unsync(slave_dev, bond_dev); 568 dev_mc_unsync(slave_dev, bond_dev); 569 570 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 571 /* del lacpdu mc addr from mc list */ 572 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 573 574 dev_mc_del(slave_dev, lacpdu_multicast); 575 } 576 } 577 578 /*--------------------------- Active slave change ---------------------------*/ 579 580 /* Update the hardware address list and promisc/allmulti for the new and 581 * old active slaves (if any). Modes that are not using primary keep all 582 * slaves up date at all times; only the modes that use primary need to call 583 * this function to swap these settings during a failover. 584 */ 585 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active, 586 struct slave *old_active) 587 { 588 if (old_active) { 589 if (bond->dev->flags & IFF_PROMISC) 590 dev_set_promiscuity(old_active->dev, -1); 591 592 if (bond->dev->flags & IFF_ALLMULTI) 593 dev_set_allmulti(old_active->dev, -1); 594 595 bond_hw_addr_flush(bond->dev, old_active->dev); 596 } 597 598 if (new_active) { 599 /* FIXME: Signal errors upstream. */ 600 if (bond->dev->flags & IFF_PROMISC) 601 dev_set_promiscuity(new_active->dev, 1); 602 603 if (bond->dev->flags & IFF_ALLMULTI) 604 dev_set_allmulti(new_active->dev, 1); 605 606 netif_addr_lock_bh(bond->dev); 607 dev_uc_sync(new_active->dev, bond->dev); 608 dev_mc_sync(new_active->dev, bond->dev); 609 netif_addr_unlock_bh(bond->dev); 610 } 611 } 612 613 /** 614 * bond_set_dev_addr - clone slave's address to bond 615 * @bond_dev: bond net device 616 * @slave_dev: slave net device 617 * 618 * Should be called with RTNL held. 619 */ 620 static void bond_set_dev_addr(struct net_device *bond_dev, 621 struct net_device *slave_dev) 622 { 623 netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n", 624 bond_dev, slave_dev, slave_dev->addr_len); 625 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len); 626 bond_dev->addr_assign_type = NET_ADDR_STOLEN; 627 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev); 628 } 629 630 static struct slave *bond_get_old_active(struct bonding *bond, 631 struct slave *new_active) 632 { 633 struct slave *slave; 634 struct list_head *iter; 635 636 bond_for_each_slave(bond, slave, iter) { 637 if (slave == new_active) 638 continue; 639 640 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr)) 641 return slave; 642 } 643 644 return NULL; 645 } 646 647 /* bond_do_fail_over_mac 648 * 649 * Perform special MAC address swapping for fail_over_mac settings 650 * 651 * Called with RTNL 652 */ 653 static void bond_do_fail_over_mac(struct bonding *bond, 654 struct slave *new_active, 655 struct slave *old_active) 656 { 657 u8 tmp_mac[ETH_ALEN]; 658 struct sockaddr saddr; 659 int rv; 660 661 switch (bond->params.fail_over_mac) { 662 case BOND_FOM_ACTIVE: 663 if (new_active) 664 bond_set_dev_addr(bond->dev, new_active->dev); 665 break; 666 case BOND_FOM_FOLLOW: 667 /* if new_active && old_active, swap them 668 * if just old_active, do nothing (going to no active slave) 669 * if just new_active, set new_active to bond's MAC 670 */ 671 if (!new_active) 672 return; 673 674 if (!old_active) 675 old_active = bond_get_old_active(bond, new_active); 676 677 if (old_active) { 678 ether_addr_copy(tmp_mac, new_active->dev->dev_addr); 679 ether_addr_copy(saddr.sa_data, 680 old_active->dev->dev_addr); 681 saddr.sa_family = new_active->dev->type; 682 } else { 683 ether_addr_copy(saddr.sa_data, bond->dev->dev_addr); 684 saddr.sa_family = bond->dev->type; 685 } 686 687 rv = dev_set_mac_address(new_active->dev, &saddr); 688 if (rv) { 689 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n", 690 -rv, new_active->dev->name); 691 goto out; 692 } 693 694 if (!old_active) 695 goto out; 696 697 ether_addr_copy(saddr.sa_data, tmp_mac); 698 saddr.sa_family = old_active->dev->type; 699 700 rv = dev_set_mac_address(old_active->dev, &saddr); 701 if (rv) 702 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n", 703 -rv, new_active->dev->name); 704 out: 705 break; 706 default: 707 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n", 708 bond->params.fail_over_mac); 709 break; 710 } 711 712 } 713 714 static struct slave *bond_choose_primary_or_current(struct bonding *bond) 715 { 716 struct slave *prim = rtnl_dereference(bond->primary_slave); 717 struct slave *curr = rtnl_dereference(bond->curr_active_slave); 718 719 if (!prim || prim->link != BOND_LINK_UP) { 720 if (!curr || curr->link != BOND_LINK_UP) 721 return NULL; 722 return curr; 723 } 724 725 if (bond->force_primary) { 726 bond->force_primary = false; 727 return prim; 728 } 729 730 if (!curr || curr->link != BOND_LINK_UP) 731 return prim; 732 733 /* At this point, prim and curr are both up */ 734 switch (bond->params.primary_reselect) { 735 case BOND_PRI_RESELECT_ALWAYS: 736 return prim; 737 case BOND_PRI_RESELECT_BETTER: 738 if (prim->speed < curr->speed) 739 return curr; 740 if (prim->speed == curr->speed && prim->duplex <= curr->duplex) 741 return curr; 742 return prim; 743 case BOND_PRI_RESELECT_FAILURE: 744 return curr; 745 default: 746 netdev_err(bond->dev, "impossible primary_reselect %d\n", 747 bond->params.primary_reselect); 748 return curr; 749 } 750 } 751 752 /** 753 * bond_find_best_slave - select the best available slave to be the active one 754 * @bond: our bonding struct 755 */ 756 static struct slave *bond_find_best_slave(struct bonding *bond) 757 { 758 struct slave *slave, *bestslave = NULL; 759 struct list_head *iter; 760 int mintime = bond->params.updelay; 761 762 slave = bond_choose_primary_or_current(bond); 763 if (slave) 764 return slave; 765 766 bond_for_each_slave(bond, slave, iter) { 767 if (slave->link == BOND_LINK_UP) 768 return slave; 769 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) && 770 slave->delay < mintime) { 771 mintime = slave->delay; 772 bestslave = slave; 773 } 774 } 775 776 return bestslave; 777 } 778 779 static bool bond_should_notify_peers(struct bonding *bond) 780 { 781 struct slave *slave; 782 783 rcu_read_lock(); 784 slave = rcu_dereference(bond->curr_active_slave); 785 rcu_read_unlock(); 786 787 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n", 788 slave ? slave->dev->name : "NULL"); 789 790 if (!slave || !bond->send_peer_notif || 791 !netif_carrier_ok(bond->dev) || 792 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) 793 return false; 794 795 return true; 796 } 797 798 /** 799 * change_active_interface - change the active slave into the specified one 800 * @bond: our bonding struct 801 * @new: the new slave to make the active one 802 * 803 * Set the new slave to the bond's settings and unset them on the old 804 * curr_active_slave. 805 * Setting include flags, mc-list, promiscuity, allmulti, etc. 806 * 807 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, 808 * because it is apparently the best available slave we have, even though its 809 * updelay hasn't timed out yet. 810 * 811 * Caller must hold RTNL. 812 */ 813 void bond_change_active_slave(struct bonding *bond, struct slave *new_active) 814 { 815 struct slave *old_active; 816 817 ASSERT_RTNL(); 818 819 old_active = rtnl_dereference(bond->curr_active_slave); 820 821 if (old_active == new_active) 822 return; 823 824 if (new_active) { 825 new_active->last_link_up = jiffies; 826 827 if (new_active->link == BOND_LINK_BACK) { 828 if (bond_uses_primary(bond)) { 829 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n", 830 new_active->dev->name, 831 (bond->params.updelay - new_active->delay) * bond->params.miimon); 832 } 833 834 new_active->delay = 0; 835 bond_set_slave_link_state(new_active, BOND_LINK_UP, 836 BOND_SLAVE_NOTIFY_NOW); 837 838 if (BOND_MODE(bond) == BOND_MODE_8023AD) 839 bond_3ad_handle_link_change(new_active, BOND_LINK_UP); 840 841 if (bond_is_lb(bond)) 842 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); 843 } else { 844 if (bond_uses_primary(bond)) { 845 netdev_info(bond->dev, "making interface %s the new active one\n", 846 new_active->dev->name); 847 } 848 } 849 } 850 851 if (bond_uses_primary(bond)) 852 bond_hw_addr_swap(bond, new_active, old_active); 853 854 if (bond_is_lb(bond)) { 855 bond_alb_handle_active_change(bond, new_active); 856 if (old_active) 857 bond_set_slave_inactive_flags(old_active, 858 BOND_SLAVE_NOTIFY_NOW); 859 if (new_active) 860 bond_set_slave_active_flags(new_active, 861 BOND_SLAVE_NOTIFY_NOW); 862 } else { 863 rcu_assign_pointer(bond->curr_active_slave, new_active); 864 } 865 866 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) { 867 if (old_active) 868 bond_set_slave_inactive_flags(old_active, 869 BOND_SLAVE_NOTIFY_NOW); 870 871 if (new_active) { 872 bool should_notify_peers = false; 873 874 bond_set_slave_active_flags(new_active, 875 BOND_SLAVE_NOTIFY_NOW); 876 877 if (bond->params.fail_over_mac) 878 bond_do_fail_over_mac(bond, new_active, 879 old_active); 880 881 if (netif_running(bond->dev)) { 882 bond->send_peer_notif = 883 bond->params.num_peer_notif; 884 should_notify_peers = 885 bond_should_notify_peers(bond); 886 } 887 888 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev); 889 if (should_notify_peers) 890 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 891 bond->dev); 892 } 893 } 894 895 /* resend IGMP joins since active slave has changed or 896 * all were sent on curr_active_slave. 897 * resend only if bond is brought up with the affected 898 * bonding modes and the retransmission is enabled 899 */ 900 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && 901 ((bond_uses_primary(bond) && new_active) || 902 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) { 903 bond->igmp_retrans = bond->params.resend_igmp; 904 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 905 } 906 } 907 908 /** 909 * bond_select_active_slave - select a new active slave, if needed 910 * @bond: our bonding struct 911 * 912 * This functions should be called when one of the following occurs: 913 * - The old curr_active_slave has been released or lost its link. 914 * - The primary_slave has got its link back. 915 * - A slave has got its link back and there's no old curr_active_slave. 916 * 917 * Caller must hold RTNL. 918 */ 919 void bond_select_active_slave(struct bonding *bond) 920 { 921 struct slave *best_slave; 922 int rv; 923 924 ASSERT_RTNL(); 925 926 best_slave = bond_find_best_slave(bond); 927 if (best_slave != rtnl_dereference(bond->curr_active_slave)) { 928 bond_change_active_slave(bond, best_slave); 929 rv = bond_set_carrier(bond); 930 if (!rv) 931 return; 932 933 if (netif_carrier_ok(bond->dev)) { 934 netdev_info(bond->dev, "first active interface up!\n"); 935 } else { 936 netdev_info(bond->dev, "now running without any active interface!\n"); 937 } 938 } 939 } 940 941 #ifdef CONFIG_NET_POLL_CONTROLLER 942 static inline int slave_enable_netpoll(struct slave *slave) 943 { 944 struct netpoll *np; 945 int err = 0; 946 947 np = kzalloc(sizeof(*np), GFP_KERNEL); 948 err = -ENOMEM; 949 if (!np) 950 goto out; 951 952 err = __netpoll_setup(np, slave->dev); 953 if (err) { 954 kfree(np); 955 goto out; 956 } 957 slave->np = np; 958 out: 959 return err; 960 } 961 static inline void slave_disable_netpoll(struct slave *slave) 962 { 963 struct netpoll *np = slave->np; 964 965 if (!np) 966 return; 967 968 slave->np = NULL; 969 __netpoll_free_async(np); 970 } 971 972 static void bond_poll_controller(struct net_device *bond_dev) 973 { 974 struct bonding *bond = netdev_priv(bond_dev); 975 struct slave *slave = NULL; 976 struct list_head *iter; 977 struct ad_info ad_info; 978 struct netpoll_info *ni; 979 const struct net_device_ops *ops; 980 981 if (BOND_MODE(bond) == BOND_MODE_8023AD) 982 if (bond_3ad_get_active_agg_info(bond, &ad_info)) 983 return; 984 985 bond_for_each_slave_rcu(bond, slave, iter) { 986 ops = slave->dev->netdev_ops; 987 if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller) 988 continue; 989 990 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 991 struct aggregator *agg = 992 SLAVE_AD_INFO(slave)->port.aggregator; 993 994 if (agg && 995 agg->aggregator_identifier != ad_info.aggregator_id) 996 continue; 997 } 998 999 ni = rcu_dereference_bh(slave->dev->npinfo); 1000 if (down_trylock(&ni->dev_lock)) 1001 continue; 1002 ops->ndo_poll_controller(slave->dev); 1003 up(&ni->dev_lock); 1004 } 1005 } 1006 1007 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1008 { 1009 struct bonding *bond = netdev_priv(bond_dev); 1010 struct list_head *iter; 1011 struct slave *slave; 1012 1013 bond_for_each_slave(bond, slave, iter) 1014 if (bond_slave_is_up(slave)) 1015 slave_disable_netpoll(slave); 1016 } 1017 1018 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) 1019 { 1020 struct bonding *bond = netdev_priv(dev); 1021 struct list_head *iter; 1022 struct slave *slave; 1023 int err = 0; 1024 1025 bond_for_each_slave(bond, slave, iter) { 1026 err = slave_enable_netpoll(slave); 1027 if (err) { 1028 bond_netpoll_cleanup(dev); 1029 break; 1030 } 1031 } 1032 return err; 1033 } 1034 #else 1035 static inline int slave_enable_netpoll(struct slave *slave) 1036 { 1037 return 0; 1038 } 1039 static inline void slave_disable_netpoll(struct slave *slave) 1040 { 1041 } 1042 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1043 { 1044 } 1045 #endif 1046 1047 /*---------------------------------- IOCTL ----------------------------------*/ 1048 1049 static netdev_features_t bond_fix_features(struct net_device *dev, 1050 netdev_features_t features) 1051 { 1052 struct bonding *bond = netdev_priv(dev); 1053 struct list_head *iter; 1054 netdev_features_t mask; 1055 struct slave *slave; 1056 1057 mask = features; 1058 1059 features &= ~NETIF_F_ONE_FOR_ALL; 1060 features |= NETIF_F_ALL_FOR_ALL; 1061 1062 bond_for_each_slave(bond, slave, iter) { 1063 features = netdev_increment_features(features, 1064 slave->dev->features, 1065 mask); 1066 } 1067 features = netdev_add_tso_features(features, mask); 1068 1069 return features; 1070 } 1071 1072 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1073 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \ 1074 NETIF_F_HIGHDMA | NETIF_F_LRO) 1075 1076 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1077 NETIF_F_RXCSUM | NETIF_F_ALL_TSO) 1078 1079 static void bond_compute_features(struct bonding *bond) 1080 { 1081 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE | 1082 IFF_XMIT_DST_RELEASE_PERM; 1083 netdev_features_t vlan_features = BOND_VLAN_FEATURES; 1084 netdev_features_t enc_features = BOND_ENC_FEATURES; 1085 struct net_device *bond_dev = bond->dev; 1086 struct list_head *iter; 1087 struct slave *slave; 1088 unsigned short max_hard_header_len = ETH_HLEN; 1089 unsigned int gso_max_size = GSO_MAX_SIZE; 1090 u16 gso_max_segs = GSO_MAX_SEGS; 1091 1092 if (!bond_has_slaves(bond)) 1093 goto done; 1094 vlan_features &= NETIF_F_ALL_FOR_ALL; 1095 1096 bond_for_each_slave(bond, slave, iter) { 1097 vlan_features = netdev_increment_features(vlan_features, 1098 slave->dev->vlan_features, BOND_VLAN_FEATURES); 1099 1100 enc_features = netdev_increment_features(enc_features, 1101 slave->dev->hw_enc_features, 1102 BOND_ENC_FEATURES); 1103 dst_release_flag &= slave->dev->priv_flags; 1104 if (slave->dev->hard_header_len > max_hard_header_len) 1105 max_hard_header_len = slave->dev->hard_header_len; 1106 1107 gso_max_size = min(gso_max_size, slave->dev->gso_max_size); 1108 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs); 1109 } 1110 1111 done: 1112 bond_dev->vlan_features = vlan_features; 1113 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL; 1114 bond_dev->hard_header_len = max_hard_header_len; 1115 bond_dev->gso_max_segs = gso_max_segs; 1116 netif_set_gso_max_size(bond_dev, gso_max_size); 1117 1118 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1119 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) && 1120 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM)) 1121 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE; 1122 1123 netdev_change_features(bond_dev); 1124 } 1125 1126 static void bond_setup_by_slave(struct net_device *bond_dev, 1127 struct net_device *slave_dev) 1128 { 1129 bond_dev->header_ops = slave_dev->header_ops; 1130 1131 bond_dev->type = slave_dev->type; 1132 bond_dev->hard_header_len = slave_dev->hard_header_len; 1133 bond_dev->addr_len = slave_dev->addr_len; 1134 1135 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1136 slave_dev->addr_len); 1137 } 1138 1139 /* On bonding slaves other than the currently active slave, suppress 1140 * duplicates except for alb non-mcast/bcast. 1141 */ 1142 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1143 struct slave *slave, 1144 struct bonding *bond) 1145 { 1146 if (bond_is_slave_inactive(slave)) { 1147 if (BOND_MODE(bond) == BOND_MODE_ALB && 1148 skb->pkt_type != PACKET_BROADCAST && 1149 skb->pkt_type != PACKET_MULTICAST) 1150 return false; 1151 return true; 1152 } 1153 return false; 1154 } 1155 1156 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1157 { 1158 struct sk_buff *skb = *pskb; 1159 struct slave *slave; 1160 struct bonding *bond; 1161 int (*recv_probe)(const struct sk_buff *, struct bonding *, 1162 struct slave *); 1163 int ret = RX_HANDLER_ANOTHER; 1164 1165 skb = skb_share_check(skb, GFP_ATOMIC); 1166 if (unlikely(!skb)) 1167 return RX_HANDLER_CONSUMED; 1168 1169 *pskb = skb; 1170 1171 slave = bond_slave_get_rcu(skb->dev); 1172 bond = slave->bond; 1173 1174 recv_probe = ACCESS_ONCE(bond->recv_probe); 1175 if (recv_probe) { 1176 ret = recv_probe(skb, bond, slave); 1177 if (ret == RX_HANDLER_CONSUMED) { 1178 consume_skb(skb); 1179 return ret; 1180 } 1181 } 1182 1183 if (bond_should_deliver_exact_match(skb, slave, bond)) { 1184 return RX_HANDLER_EXACT; 1185 } 1186 1187 skb->dev = bond->dev; 1188 1189 if (BOND_MODE(bond) == BOND_MODE_ALB && 1190 bond->dev->priv_flags & IFF_BRIDGE_PORT && 1191 skb->pkt_type == PACKET_HOST) { 1192 1193 if (unlikely(skb_cow_head(skb, 1194 skb->data - skb_mac_header(skb)))) { 1195 kfree_skb(skb); 1196 return RX_HANDLER_CONSUMED; 1197 } 1198 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr); 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 int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave) 1222 { 1223 struct netdev_lag_upper_info lag_upper_info; 1224 int err; 1225 1226 lag_upper_info.tx_type = bond_lag_tx_type(bond); 1227 err = netdev_master_upper_dev_link(slave->dev, bond->dev, slave, 1228 &lag_upper_info); 1229 if (err) 1230 return err; 1231 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL); 1232 return 0; 1233 } 1234 1235 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave) 1236 { 1237 netdev_upper_dev_unlink(slave->dev, bond->dev); 1238 slave->dev->flags &= ~IFF_SLAVE; 1239 rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL); 1240 } 1241 1242 static struct slave *bond_alloc_slave(struct bonding *bond) 1243 { 1244 struct slave *slave = NULL; 1245 1246 slave = kzalloc(sizeof(struct slave), GFP_KERNEL); 1247 if (!slave) 1248 return NULL; 1249 1250 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1251 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info), 1252 GFP_KERNEL); 1253 if (!SLAVE_AD_INFO(slave)) { 1254 kfree(slave); 1255 return NULL; 1256 } 1257 } 1258 return slave; 1259 } 1260 1261 static void bond_free_slave(struct slave *slave) 1262 { 1263 struct bonding *bond = bond_get_bond_by_slave(slave); 1264 1265 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1266 kfree(SLAVE_AD_INFO(slave)); 1267 1268 kfree(slave); 1269 } 1270 1271 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info) 1272 { 1273 info->bond_mode = BOND_MODE(bond); 1274 info->miimon = bond->params.miimon; 1275 info->num_slaves = bond->slave_cnt; 1276 } 1277 1278 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info) 1279 { 1280 strcpy(info->slave_name, slave->dev->name); 1281 info->link = slave->link; 1282 info->state = bond_slave_state(slave); 1283 info->link_failure_count = slave->link_failure_count; 1284 } 1285 1286 static void bond_netdev_notify(struct net_device *dev, 1287 struct netdev_bonding_info *info) 1288 { 1289 rtnl_lock(); 1290 netdev_bonding_info_change(dev, info); 1291 rtnl_unlock(); 1292 } 1293 1294 static void bond_netdev_notify_work(struct work_struct *_work) 1295 { 1296 struct netdev_notify_work *w = 1297 container_of(_work, struct netdev_notify_work, work.work); 1298 1299 bond_netdev_notify(w->dev, &w->bonding_info); 1300 dev_put(w->dev); 1301 kfree(w); 1302 } 1303 1304 void bond_queue_slave_event(struct slave *slave) 1305 { 1306 struct bonding *bond = slave->bond; 1307 struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC); 1308 1309 if (!nnw) 1310 return; 1311 1312 dev_hold(slave->dev); 1313 nnw->dev = slave->dev; 1314 bond_fill_ifslave(slave, &nnw->bonding_info.slave); 1315 bond_fill_ifbond(bond, &nnw->bonding_info.master); 1316 INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work); 1317 1318 queue_delayed_work(slave->bond->wq, &nnw->work, 0); 1319 } 1320 1321 void bond_lower_state_changed(struct slave *slave) 1322 { 1323 struct netdev_lag_lower_state_info info; 1324 1325 info.link_up = slave->link == BOND_LINK_UP || 1326 slave->link == BOND_LINK_FAIL; 1327 info.tx_enabled = bond_is_active_slave(slave); 1328 netdev_lower_state_changed(slave->dev, &info); 1329 } 1330 1331 /* enslave device <slave> to bond device <master> */ 1332 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev) 1333 { 1334 struct bonding *bond = netdev_priv(bond_dev); 1335 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1336 struct slave *new_slave = NULL, *prev_slave; 1337 struct sockaddr addr; 1338 int link_reporting; 1339 int res = 0, i; 1340 1341 if (!bond->params.use_carrier && 1342 slave_dev->ethtool_ops->get_link == NULL && 1343 slave_ops->ndo_do_ioctl == NULL) { 1344 netdev_warn(bond_dev, "no link monitoring support for %s\n", 1345 slave_dev->name); 1346 } 1347 1348 /* already enslaved */ 1349 if (slave_dev->flags & IFF_SLAVE) { 1350 netdev_dbg(bond_dev, "Error: Device was already enslaved\n"); 1351 return -EBUSY; 1352 } 1353 1354 if (bond_dev == slave_dev) { 1355 netdev_err(bond_dev, "cannot enslave bond to itself.\n"); 1356 return -EPERM; 1357 } 1358 1359 /* vlan challenged mutual exclusion */ 1360 /* no need to lock since we're protected by rtnl_lock */ 1361 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1362 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n", 1363 slave_dev->name); 1364 if (vlan_uses_dev(bond_dev)) { 1365 netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n", 1366 slave_dev->name, bond_dev->name); 1367 return -EPERM; 1368 } else { 1369 netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n", 1370 slave_dev->name, slave_dev->name, 1371 bond_dev->name); 1372 } 1373 } else { 1374 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n", 1375 slave_dev->name); 1376 } 1377 1378 /* Old ifenslave binaries are no longer supported. These can 1379 * be identified with moderate accuracy by the state of the slave: 1380 * the current ifenslave will set the interface down prior to 1381 * enslaving it; the old ifenslave will not. 1382 */ 1383 if (slave_dev->flags & IFF_UP) { 1384 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n", 1385 slave_dev->name); 1386 res = -EPERM; 1387 goto err_undo_flags; 1388 } 1389 1390 /* set bonding device ether type by slave - bonding netdevices are 1391 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1392 * there is a need to override some of the type dependent attribs/funcs. 1393 * 1394 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1395 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1396 */ 1397 if (!bond_has_slaves(bond)) { 1398 if (bond_dev->type != slave_dev->type) { 1399 netdev_dbg(bond_dev, "change device type from %d to %d\n", 1400 bond_dev->type, slave_dev->type); 1401 1402 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, 1403 bond_dev); 1404 res = notifier_to_errno(res); 1405 if (res) { 1406 netdev_err(bond_dev, "refused to change device type\n"); 1407 res = -EBUSY; 1408 goto err_undo_flags; 1409 } 1410 1411 /* Flush unicast and multicast addresses */ 1412 dev_uc_flush(bond_dev); 1413 dev_mc_flush(bond_dev); 1414 1415 if (slave_dev->type != ARPHRD_ETHER) 1416 bond_setup_by_slave(bond_dev, slave_dev); 1417 else { 1418 ether_setup(bond_dev); 1419 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1420 } 1421 1422 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, 1423 bond_dev); 1424 } 1425 } else if (bond_dev->type != slave_dev->type) { 1426 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n", 1427 slave_dev->name, slave_dev->type, bond_dev->type); 1428 res = -EINVAL; 1429 goto err_undo_flags; 1430 } 1431 1432 if (slave_ops->ndo_set_mac_address == NULL) { 1433 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n"); 1434 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP && 1435 bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1436 if (!bond_has_slaves(bond)) { 1437 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1438 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n"); 1439 } else { 1440 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"); 1441 res = -EOPNOTSUPP; 1442 goto err_undo_flags; 1443 } 1444 } 1445 } 1446 1447 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1448 1449 /* If this is the first slave, then we need to set the master's hardware 1450 * address to be the same as the slave's. 1451 */ 1452 if (!bond_has_slaves(bond) && 1453 bond->dev->addr_assign_type == NET_ADDR_RANDOM) 1454 bond_set_dev_addr(bond->dev, slave_dev); 1455 1456 new_slave = bond_alloc_slave(bond); 1457 if (!new_slave) { 1458 res = -ENOMEM; 1459 goto err_undo_flags; 1460 } 1461 1462 new_slave->bond = bond; 1463 new_slave->dev = slave_dev; 1464 /* Set the new_slave's queue_id to be zero. Queue ID mapping 1465 * is set via sysfs or module option if desired. 1466 */ 1467 new_slave->queue_id = 0; 1468 1469 /* Save slave's original mtu and then set it to match the bond */ 1470 new_slave->original_mtu = slave_dev->mtu; 1471 res = dev_set_mtu(slave_dev, bond->dev->mtu); 1472 if (res) { 1473 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res); 1474 goto err_free; 1475 } 1476 1477 /* Save slave's original ("permanent") mac address for modes 1478 * that need it, and for restoring it upon release, and then 1479 * set it to the master's address 1480 */ 1481 ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr); 1482 1483 if (!bond->params.fail_over_mac || 1484 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1485 /* Set slave to master's mac address. The application already 1486 * set the master's mac address to that of the first slave 1487 */ 1488 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 1489 addr.sa_family = slave_dev->type; 1490 res = dev_set_mac_address(slave_dev, &addr); 1491 if (res) { 1492 netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res); 1493 goto err_restore_mtu; 1494 } 1495 } 1496 1497 /* set slave flag before open to prevent IPv6 addrconf */ 1498 slave_dev->flags |= IFF_SLAVE; 1499 1500 /* open the slave since the application closed it */ 1501 res = dev_open(slave_dev); 1502 if (res) { 1503 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name); 1504 goto err_restore_mac; 1505 } 1506 1507 slave_dev->priv_flags |= IFF_BONDING; 1508 /* initialize slave stats */ 1509 dev_get_stats(new_slave->dev, &new_slave->slave_stats); 1510 1511 if (bond_is_lb(bond)) { 1512 /* bond_alb_init_slave() must be called before all other stages since 1513 * it might fail and we do not want to have to undo everything 1514 */ 1515 res = bond_alb_init_slave(bond, new_slave); 1516 if (res) 1517 goto err_close; 1518 } 1519 1520 /* If the mode uses primary, then the following is handled by 1521 * bond_change_active_slave(). 1522 */ 1523 if (!bond_uses_primary(bond)) { 1524 /* set promiscuity level to new slave */ 1525 if (bond_dev->flags & IFF_PROMISC) { 1526 res = dev_set_promiscuity(slave_dev, 1); 1527 if (res) 1528 goto err_close; 1529 } 1530 1531 /* set allmulti level to new slave */ 1532 if (bond_dev->flags & IFF_ALLMULTI) { 1533 res = dev_set_allmulti(slave_dev, 1); 1534 if (res) 1535 goto err_close; 1536 } 1537 1538 netif_addr_lock_bh(bond_dev); 1539 1540 dev_mc_sync_multiple(slave_dev, bond_dev); 1541 dev_uc_sync_multiple(slave_dev, bond_dev); 1542 1543 netif_addr_unlock_bh(bond_dev); 1544 } 1545 1546 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1547 /* add lacpdu mc addr to mc list */ 1548 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 1549 1550 dev_mc_add(slave_dev, lacpdu_multicast); 1551 } 1552 1553 res = vlan_vids_add_by_dev(slave_dev, bond_dev); 1554 if (res) { 1555 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n", 1556 slave_dev->name); 1557 goto err_close; 1558 } 1559 1560 prev_slave = bond_last_slave(bond); 1561 1562 new_slave->delay = 0; 1563 new_slave->link_failure_count = 0; 1564 1565 bond_update_speed_duplex(new_slave); 1566 1567 new_slave->last_rx = jiffies - 1568 (msecs_to_jiffies(bond->params.arp_interval) + 1); 1569 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) 1570 new_slave->target_last_arp_rx[i] = new_slave->last_rx; 1571 1572 if (bond->params.miimon && !bond->params.use_carrier) { 1573 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 1574 1575 if ((link_reporting == -1) && !bond->params.arp_interval) { 1576 /* miimon is set but a bonded network driver 1577 * does not support ETHTOOL/MII and 1578 * arp_interval is not set. Note: if 1579 * use_carrier is enabled, we will never go 1580 * here (because netif_carrier is always 1581 * supported); thus, we don't need to change 1582 * the messages for netif_carrier. 1583 */ 1584 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", 1585 slave_dev->name); 1586 } else if (link_reporting == -1) { 1587 /* unable get link status using mii/ethtool */ 1588 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", 1589 slave_dev->name); 1590 } 1591 } 1592 1593 /* check for initial state */ 1594 if (bond->params.miimon) { 1595 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { 1596 if (bond->params.updelay) { 1597 bond_set_slave_link_state(new_slave, 1598 BOND_LINK_BACK, 1599 BOND_SLAVE_NOTIFY_NOW); 1600 new_slave->delay = bond->params.updelay; 1601 } else { 1602 bond_set_slave_link_state(new_slave, 1603 BOND_LINK_UP, 1604 BOND_SLAVE_NOTIFY_NOW); 1605 } 1606 } else { 1607 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN, 1608 BOND_SLAVE_NOTIFY_NOW); 1609 } 1610 } else if (bond->params.arp_interval) { 1611 bond_set_slave_link_state(new_slave, 1612 (netif_carrier_ok(slave_dev) ? 1613 BOND_LINK_UP : BOND_LINK_DOWN), 1614 BOND_SLAVE_NOTIFY_NOW); 1615 } else { 1616 bond_set_slave_link_state(new_slave, BOND_LINK_UP, 1617 BOND_SLAVE_NOTIFY_NOW); 1618 } 1619 1620 if (new_slave->link != BOND_LINK_DOWN) 1621 new_slave->last_link_up = jiffies; 1622 netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n", 1623 new_slave->link == BOND_LINK_DOWN ? "DOWN" : 1624 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); 1625 1626 if (bond_uses_primary(bond) && bond->params.primary[0]) { 1627 /* if there is a primary slave, remember it */ 1628 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 1629 rcu_assign_pointer(bond->primary_slave, new_slave); 1630 bond->force_primary = true; 1631 } 1632 } 1633 1634 switch (BOND_MODE(bond)) { 1635 case BOND_MODE_ACTIVEBACKUP: 1636 bond_set_slave_inactive_flags(new_slave, 1637 BOND_SLAVE_NOTIFY_NOW); 1638 break; 1639 case BOND_MODE_8023AD: 1640 /* in 802.3ad mode, the internal mechanism 1641 * will activate the slaves in the selected 1642 * aggregator 1643 */ 1644 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 1645 /* if this is the first slave */ 1646 if (!prev_slave) { 1647 SLAVE_AD_INFO(new_slave)->id = 1; 1648 /* Initialize AD with the number of times that the AD timer is called in 1 second 1649 * can be called only after the mac address of the bond is set 1650 */ 1651 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL); 1652 } else { 1653 SLAVE_AD_INFO(new_slave)->id = 1654 SLAVE_AD_INFO(prev_slave)->id + 1; 1655 } 1656 1657 bond_3ad_bind_slave(new_slave); 1658 break; 1659 case BOND_MODE_TLB: 1660 case BOND_MODE_ALB: 1661 bond_set_active_slave(new_slave); 1662 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 1663 break; 1664 default: 1665 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n"); 1666 1667 /* always active in trunk mode */ 1668 bond_set_active_slave(new_slave); 1669 1670 /* In trunking mode there is little meaning to curr_active_slave 1671 * anyway (it holds no special properties of the bond device), 1672 * so we can change it without calling change_active_interface() 1673 */ 1674 if (!rcu_access_pointer(bond->curr_active_slave) && 1675 new_slave->link == BOND_LINK_UP) 1676 rcu_assign_pointer(bond->curr_active_slave, new_slave); 1677 1678 break; 1679 } /* switch(bond_mode) */ 1680 1681 #ifdef CONFIG_NET_POLL_CONTROLLER 1682 slave_dev->npinfo = bond->dev->npinfo; 1683 if (slave_dev->npinfo) { 1684 if (slave_enable_netpoll(new_slave)) { 1685 netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n"); 1686 res = -EBUSY; 1687 goto err_detach; 1688 } 1689 } 1690 #endif 1691 1692 if (!(bond_dev->features & NETIF_F_LRO)) 1693 dev_disable_lro(slave_dev); 1694 1695 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 1696 new_slave); 1697 if (res) { 1698 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res); 1699 goto err_detach; 1700 } 1701 1702 res = bond_master_upper_dev_link(bond, new_slave); 1703 if (res) { 1704 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res); 1705 goto err_unregister; 1706 } 1707 1708 res = bond_sysfs_slave_add(new_slave); 1709 if (res) { 1710 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res); 1711 goto err_upper_unlink; 1712 } 1713 1714 bond->slave_cnt++; 1715 bond_compute_features(bond); 1716 bond_set_carrier(bond); 1717 1718 if (bond_uses_primary(bond)) { 1719 block_netpoll_tx(); 1720 bond_select_active_slave(bond); 1721 unblock_netpoll_tx(); 1722 } 1723 1724 if (bond_mode_uses_xmit_hash(bond)) 1725 bond_update_slave_arr(bond, NULL); 1726 1727 netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n", 1728 slave_dev->name, 1729 bond_is_active_slave(new_slave) ? "an active" : "a backup", 1730 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down"); 1731 1732 /* enslave is successful */ 1733 bond_queue_slave_event(new_slave); 1734 return 0; 1735 1736 /* Undo stages on error */ 1737 err_upper_unlink: 1738 bond_upper_dev_unlink(bond, new_slave); 1739 1740 err_unregister: 1741 netdev_rx_handler_unregister(slave_dev); 1742 1743 err_detach: 1744 if (!bond_uses_primary(bond)) 1745 bond_hw_addr_flush(bond_dev, slave_dev); 1746 1747 vlan_vids_del_by_dev(slave_dev, bond_dev); 1748 if (rcu_access_pointer(bond->primary_slave) == new_slave) 1749 RCU_INIT_POINTER(bond->primary_slave, NULL); 1750 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) { 1751 block_netpoll_tx(); 1752 bond_change_active_slave(bond, NULL); 1753 bond_select_active_slave(bond); 1754 unblock_netpoll_tx(); 1755 } 1756 /* either primary_slave or curr_active_slave might've changed */ 1757 synchronize_rcu(); 1758 slave_disable_netpoll(new_slave); 1759 1760 err_close: 1761 slave_dev->priv_flags &= ~IFF_BONDING; 1762 dev_close(slave_dev); 1763 1764 err_restore_mac: 1765 slave_dev->flags &= ~IFF_SLAVE; 1766 if (!bond->params.fail_over_mac || 1767 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1768 /* XXX TODO - fom follow mode needs to change master's 1769 * MAC if this slave's MAC is in use by the bond, or at 1770 * least print a warning. 1771 */ 1772 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr); 1773 addr.sa_family = slave_dev->type; 1774 dev_set_mac_address(slave_dev, &addr); 1775 } 1776 1777 err_restore_mtu: 1778 dev_set_mtu(slave_dev, new_slave->original_mtu); 1779 1780 err_free: 1781 bond_free_slave(new_slave); 1782 1783 err_undo_flags: 1784 /* Enslave of first slave has failed and we need to fix master's mac */ 1785 if (!bond_has_slaves(bond)) { 1786 if (ether_addr_equal_64bits(bond_dev->dev_addr, 1787 slave_dev->dev_addr)) 1788 eth_hw_addr_random(bond_dev); 1789 if (bond_dev->type != ARPHRD_ETHER) { 1790 dev_close(bond_dev); 1791 ether_setup(bond_dev); 1792 bond_dev->flags |= IFF_MASTER; 1793 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1794 } 1795 } 1796 1797 return res; 1798 } 1799 1800 /* Try to release the slave device <slave> from the bond device <master> 1801 * It is legal to access curr_active_slave without a lock because all the function 1802 * is RTNL-locked. If "all" is true it means that the function is being called 1803 * while destroying a bond interface and all slaves are being released. 1804 * 1805 * The rules for slave state should be: 1806 * for Active/Backup: 1807 * Active stays on all backups go down 1808 * for Bonded connections: 1809 * The first up interface should be left on and all others downed. 1810 */ 1811 static int __bond_release_one(struct net_device *bond_dev, 1812 struct net_device *slave_dev, 1813 bool all) 1814 { 1815 struct bonding *bond = netdev_priv(bond_dev); 1816 struct slave *slave, *oldcurrent; 1817 struct sockaddr addr; 1818 int old_flags = bond_dev->flags; 1819 netdev_features_t old_features = bond_dev->features; 1820 1821 /* slave is not a slave or master is not master of this slave */ 1822 if (!(slave_dev->flags & IFF_SLAVE) || 1823 !netdev_has_upper_dev(slave_dev, bond_dev)) { 1824 netdev_dbg(bond_dev, "cannot release %s\n", 1825 slave_dev->name); 1826 return -EINVAL; 1827 } 1828 1829 block_netpoll_tx(); 1830 1831 slave = bond_get_slave_by_dev(bond, slave_dev); 1832 if (!slave) { 1833 /* not a slave of this bond */ 1834 netdev_info(bond_dev, "%s not enslaved\n", 1835 slave_dev->name); 1836 unblock_netpoll_tx(); 1837 return -EINVAL; 1838 } 1839 1840 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW); 1841 1842 bond_sysfs_slave_del(slave); 1843 1844 /* recompute stats just before removing the slave */ 1845 bond_get_stats(bond->dev, &bond->bond_stats); 1846 1847 bond_upper_dev_unlink(bond, slave); 1848 /* unregister rx_handler early so bond_handle_frame wouldn't be called 1849 * for this slave anymore. 1850 */ 1851 netdev_rx_handler_unregister(slave_dev); 1852 1853 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1854 bond_3ad_unbind_slave(slave); 1855 1856 if (bond_mode_uses_xmit_hash(bond)) 1857 bond_update_slave_arr(bond, slave); 1858 1859 netdev_info(bond_dev, "Releasing %s interface %s\n", 1860 bond_is_active_slave(slave) ? "active" : "backup", 1861 slave_dev->name); 1862 1863 oldcurrent = rcu_access_pointer(bond->curr_active_slave); 1864 1865 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 1866 1867 if (!all && (!bond->params.fail_over_mac || 1868 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) { 1869 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) && 1870 bond_has_slaves(bond)) 1871 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", 1872 slave_dev->name, slave->perm_hwaddr, 1873 bond_dev->name, slave_dev->name); 1874 } 1875 1876 if (rtnl_dereference(bond->primary_slave) == slave) 1877 RCU_INIT_POINTER(bond->primary_slave, NULL); 1878 1879 if (oldcurrent == slave) 1880 bond_change_active_slave(bond, NULL); 1881 1882 if (bond_is_lb(bond)) { 1883 /* Must be called only after the slave has been 1884 * detached from the list and the curr_active_slave 1885 * has been cleared (if our_slave == old_current), 1886 * but before a new active slave is selected. 1887 */ 1888 bond_alb_deinit_slave(bond, slave); 1889 } 1890 1891 if (all) { 1892 RCU_INIT_POINTER(bond->curr_active_slave, NULL); 1893 } else if (oldcurrent == slave) { 1894 /* Note that we hold RTNL over this sequence, so there 1895 * is no concern that another slave add/remove event 1896 * will interfere. 1897 */ 1898 bond_select_active_slave(bond); 1899 } 1900 1901 if (!bond_has_slaves(bond)) { 1902 bond_set_carrier(bond); 1903 eth_hw_addr_random(bond_dev); 1904 } 1905 1906 unblock_netpoll_tx(); 1907 synchronize_rcu(); 1908 bond->slave_cnt--; 1909 1910 if (!bond_has_slaves(bond)) { 1911 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 1912 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev); 1913 } 1914 1915 bond_compute_features(bond); 1916 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 1917 (old_features & NETIF_F_VLAN_CHALLENGED)) 1918 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n", 1919 slave_dev->name, bond_dev->name); 1920 1921 vlan_vids_del_by_dev(slave_dev, bond_dev); 1922 1923 /* If the mode uses primary, then this case was handled above by 1924 * bond_change_active_slave(..., NULL) 1925 */ 1926 if (!bond_uses_primary(bond)) { 1927 /* unset promiscuity level from slave 1928 * NOTE: The NETDEV_CHANGEADDR call above may change the value 1929 * of the IFF_PROMISC flag in the bond_dev, but we need the 1930 * value of that flag before that change, as that was the value 1931 * when this slave was attached, so we cache at the start of the 1932 * function and use it here. Same goes for ALLMULTI below 1933 */ 1934 if (old_flags & IFF_PROMISC) 1935 dev_set_promiscuity(slave_dev, -1); 1936 1937 /* unset allmulti level from slave */ 1938 if (old_flags & IFF_ALLMULTI) 1939 dev_set_allmulti(slave_dev, -1); 1940 1941 bond_hw_addr_flush(bond_dev, slave_dev); 1942 } 1943 1944 slave_disable_netpoll(slave); 1945 1946 /* close slave before restoring its mac address */ 1947 dev_close(slave_dev); 1948 1949 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE || 1950 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1951 /* restore original ("permanent") mac address */ 1952 ether_addr_copy(addr.sa_data, slave->perm_hwaddr); 1953 addr.sa_family = slave_dev->type; 1954 dev_set_mac_address(slave_dev, &addr); 1955 } 1956 1957 dev_set_mtu(slave_dev, slave->original_mtu); 1958 1959 slave_dev->priv_flags &= ~IFF_BONDING; 1960 1961 bond_free_slave(slave); 1962 1963 return 0; 1964 } 1965 1966 /* A wrapper used because of ndo_del_link */ 1967 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 1968 { 1969 return __bond_release_one(bond_dev, slave_dev, false); 1970 } 1971 1972 /* First release a slave and then destroy the bond if no more slaves are left. 1973 * Must be under rtnl_lock when this function is called. 1974 */ 1975 static int bond_release_and_destroy(struct net_device *bond_dev, 1976 struct net_device *slave_dev) 1977 { 1978 struct bonding *bond = netdev_priv(bond_dev); 1979 int ret; 1980 1981 ret = bond_release(bond_dev, slave_dev); 1982 if (ret == 0 && !bond_has_slaves(bond)) { 1983 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 1984 netdev_info(bond_dev, "Destroying bond %s\n", 1985 bond_dev->name); 1986 bond_remove_proc_entry(bond); 1987 unregister_netdevice(bond_dev); 1988 } 1989 return ret; 1990 } 1991 1992 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info) 1993 { 1994 struct bonding *bond = netdev_priv(bond_dev); 1995 bond_fill_ifbond(bond, info); 1996 return 0; 1997 } 1998 1999 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 2000 { 2001 struct bonding *bond = netdev_priv(bond_dev); 2002 struct list_head *iter; 2003 int i = 0, res = -ENODEV; 2004 struct slave *slave; 2005 2006 bond_for_each_slave(bond, slave, iter) { 2007 if (i++ == (int)info->slave_id) { 2008 res = 0; 2009 bond_fill_ifslave(slave, info); 2010 break; 2011 } 2012 } 2013 2014 return res; 2015 } 2016 2017 /*-------------------------------- Monitoring -------------------------------*/ 2018 2019 /* called with rcu_read_lock() */ 2020 static int bond_miimon_inspect(struct bonding *bond) 2021 { 2022 int link_state, commit = 0; 2023 struct list_head *iter; 2024 struct slave *slave; 2025 bool ignore_updelay; 2026 2027 ignore_updelay = !rcu_dereference(bond->curr_active_slave); 2028 2029 bond_for_each_slave_rcu(bond, slave, iter) { 2030 slave->new_link = BOND_LINK_NOCHANGE; 2031 2032 link_state = bond_check_dev_link(bond, slave->dev, 0); 2033 2034 switch (slave->link) { 2035 case BOND_LINK_UP: 2036 if (link_state) 2037 continue; 2038 2039 bond_set_slave_link_state(slave, BOND_LINK_FAIL, 2040 BOND_SLAVE_NOTIFY_LATER); 2041 slave->delay = bond->params.downdelay; 2042 if (slave->delay) { 2043 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n", 2044 (BOND_MODE(bond) == 2045 BOND_MODE_ACTIVEBACKUP) ? 2046 (bond_is_active_slave(slave) ? 2047 "active " : "backup ") : "", 2048 slave->dev->name, 2049 bond->params.downdelay * bond->params.miimon); 2050 } 2051 /*FALLTHRU*/ 2052 case BOND_LINK_FAIL: 2053 if (link_state) { 2054 /* recovered before downdelay expired */ 2055 bond_set_slave_link_state(slave, BOND_LINK_UP, 2056 BOND_SLAVE_NOTIFY_LATER); 2057 slave->last_link_up = jiffies; 2058 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n", 2059 (bond->params.downdelay - slave->delay) * 2060 bond->params.miimon, 2061 slave->dev->name); 2062 continue; 2063 } 2064 2065 if (slave->delay <= 0) { 2066 slave->new_link = BOND_LINK_DOWN; 2067 commit++; 2068 continue; 2069 } 2070 2071 slave->delay--; 2072 break; 2073 2074 case BOND_LINK_DOWN: 2075 if (!link_state) 2076 continue; 2077 2078 bond_set_slave_link_state(slave, BOND_LINK_BACK, 2079 BOND_SLAVE_NOTIFY_LATER); 2080 slave->delay = bond->params.updelay; 2081 2082 if (slave->delay) { 2083 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n", 2084 slave->dev->name, 2085 ignore_updelay ? 0 : 2086 bond->params.updelay * 2087 bond->params.miimon); 2088 } 2089 /*FALLTHRU*/ 2090 case BOND_LINK_BACK: 2091 if (!link_state) { 2092 bond_set_slave_link_state(slave, 2093 BOND_LINK_DOWN, 2094 BOND_SLAVE_NOTIFY_LATER); 2095 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n", 2096 (bond->params.updelay - slave->delay) * 2097 bond->params.miimon, 2098 slave->dev->name); 2099 2100 continue; 2101 } 2102 2103 if (ignore_updelay) 2104 slave->delay = 0; 2105 2106 if (slave->delay <= 0) { 2107 slave->new_link = BOND_LINK_UP; 2108 commit++; 2109 ignore_updelay = false; 2110 continue; 2111 } 2112 2113 slave->delay--; 2114 break; 2115 } 2116 } 2117 2118 return commit; 2119 } 2120 2121 static void bond_miimon_commit(struct bonding *bond) 2122 { 2123 struct list_head *iter; 2124 struct slave *slave, *primary; 2125 2126 bond_for_each_slave(bond, slave, iter) { 2127 switch (slave->new_link) { 2128 case BOND_LINK_NOCHANGE: 2129 continue; 2130 2131 case BOND_LINK_UP: 2132 bond_update_speed_duplex(slave); 2133 bond_set_slave_link_state(slave, BOND_LINK_UP, 2134 BOND_SLAVE_NOTIFY_NOW); 2135 slave->last_link_up = jiffies; 2136 2137 primary = rtnl_dereference(bond->primary_slave); 2138 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 2139 /* prevent it from being the active one */ 2140 bond_set_backup_slave(slave); 2141 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2142 /* make it immediately active */ 2143 bond_set_active_slave(slave); 2144 } else if (slave != primary) { 2145 /* prevent it from being the active one */ 2146 bond_set_backup_slave(slave); 2147 } 2148 2149 netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n", 2150 slave->dev->name, 2151 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed, 2152 slave->duplex ? "full" : "half"); 2153 2154 /* notify ad that the link status has changed */ 2155 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2156 bond_3ad_handle_link_change(slave, BOND_LINK_UP); 2157 2158 if (bond_is_lb(bond)) 2159 bond_alb_handle_link_change(bond, slave, 2160 BOND_LINK_UP); 2161 2162 if (BOND_MODE(bond) == BOND_MODE_XOR) 2163 bond_update_slave_arr(bond, NULL); 2164 2165 if (!bond->curr_active_slave || slave == primary) 2166 goto do_failover; 2167 2168 continue; 2169 2170 case BOND_LINK_DOWN: 2171 if (slave->link_failure_count < UINT_MAX) 2172 slave->link_failure_count++; 2173 2174 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2175 BOND_SLAVE_NOTIFY_NOW); 2176 2177 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP || 2178 BOND_MODE(bond) == BOND_MODE_8023AD) 2179 bond_set_slave_inactive_flags(slave, 2180 BOND_SLAVE_NOTIFY_NOW); 2181 2182 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n", 2183 slave->dev->name); 2184 2185 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2186 bond_3ad_handle_link_change(slave, 2187 BOND_LINK_DOWN); 2188 2189 if (bond_is_lb(bond)) 2190 bond_alb_handle_link_change(bond, slave, 2191 BOND_LINK_DOWN); 2192 2193 if (BOND_MODE(bond) == BOND_MODE_XOR) 2194 bond_update_slave_arr(bond, NULL); 2195 2196 if (slave == rcu_access_pointer(bond->curr_active_slave)) 2197 goto do_failover; 2198 2199 continue; 2200 2201 default: 2202 netdev_err(bond->dev, "invalid new link %d on slave %s\n", 2203 slave->new_link, slave->dev->name); 2204 slave->new_link = BOND_LINK_NOCHANGE; 2205 2206 continue; 2207 } 2208 2209 do_failover: 2210 block_netpoll_tx(); 2211 bond_select_active_slave(bond); 2212 unblock_netpoll_tx(); 2213 } 2214 2215 bond_set_carrier(bond); 2216 } 2217 2218 /* bond_mii_monitor 2219 * 2220 * Really a wrapper that splits the mii monitor into two phases: an 2221 * inspection, then (if inspection indicates something needs to be done) 2222 * an acquisition of appropriate locks followed by a commit phase to 2223 * implement whatever link state changes are indicated. 2224 */ 2225 static void bond_mii_monitor(struct work_struct *work) 2226 { 2227 struct bonding *bond = container_of(work, struct bonding, 2228 mii_work.work); 2229 bool should_notify_peers = false; 2230 unsigned long delay; 2231 2232 delay = msecs_to_jiffies(bond->params.miimon); 2233 2234 if (!bond_has_slaves(bond)) 2235 goto re_arm; 2236 2237 rcu_read_lock(); 2238 2239 should_notify_peers = bond_should_notify_peers(bond); 2240 2241 if (bond_miimon_inspect(bond)) { 2242 rcu_read_unlock(); 2243 2244 /* Race avoidance with bond_close cancel of workqueue */ 2245 if (!rtnl_trylock()) { 2246 delay = 1; 2247 should_notify_peers = false; 2248 goto re_arm; 2249 } 2250 2251 bond_miimon_commit(bond); 2252 2253 rtnl_unlock(); /* might sleep, hold no other locks */ 2254 } else 2255 rcu_read_unlock(); 2256 2257 re_arm: 2258 if (bond->params.miimon) 2259 queue_delayed_work(bond->wq, &bond->mii_work, delay); 2260 2261 if (should_notify_peers) { 2262 if (!rtnl_trylock()) 2263 return; 2264 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); 2265 rtnl_unlock(); 2266 } 2267 } 2268 2269 static bool bond_has_this_ip(struct bonding *bond, __be32 ip) 2270 { 2271 struct net_device *upper; 2272 struct list_head *iter; 2273 bool ret = false; 2274 2275 if (ip == bond_confirm_addr(bond->dev, 0, ip)) 2276 return true; 2277 2278 rcu_read_lock(); 2279 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) { 2280 if (ip == bond_confirm_addr(upper, 0, ip)) { 2281 ret = true; 2282 break; 2283 } 2284 } 2285 rcu_read_unlock(); 2286 2287 return ret; 2288 } 2289 2290 /* We go to the (large) trouble of VLAN tagging ARP frames because 2291 * switches in VLAN mode (especially if ports are configured as 2292 * "native" to a VLAN) might not pass non-tagged frames. 2293 */ 2294 static void bond_arp_send(struct net_device *slave_dev, int arp_op, 2295 __be32 dest_ip, __be32 src_ip, 2296 struct bond_vlan_tag *tags) 2297 { 2298 struct sk_buff *skb; 2299 struct bond_vlan_tag *outer_tag = tags; 2300 2301 netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n", 2302 arp_op, slave_dev->name, &dest_ip, &src_ip); 2303 2304 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2305 NULL, slave_dev->dev_addr, NULL); 2306 2307 if (!skb) { 2308 net_err_ratelimited("ARP packet allocation failed\n"); 2309 return; 2310 } 2311 2312 if (!tags || tags->vlan_proto == VLAN_N_VID) 2313 goto xmit; 2314 2315 tags++; 2316 2317 /* Go through all the tags backwards and add them to the packet */ 2318 while (tags->vlan_proto != VLAN_N_VID) { 2319 if (!tags->vlan_id) { 2320 tags++; 2321 continue; 2322 } 2323 2324 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n", 2325 ntohs(outer_tag->vlan_proto), tags->vlan_id); 2326 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto, 2327 tags->vlan_id); 2328 if (!skb) { 2329 net_err_ratelimited("failed to insert inner VLAN tag\n"); 2330 return; 2331 } 2332 2333 tags++; 2334 } 2335 /* Set the outer tag */ 2336 if (outer_tag->vlan_id) { 2337 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n", 2338 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id); 2339 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto, 2340 outer_tag->vlan_id); 2341 } 2342 2343 xmit: 2344 arp_xmit(skb); 2345 } 2346 2347 /* Validate the device path between the @start_dev and the @end_dev. 2348 * The path is valid if the @end_dev is reachable through device 2349 * stacking. 2350 * When the path is validated, collect any vlan information in the 2351 * path. 2352 */ 2353 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev, 2354 struct net_device *end_dev, 2355 int level) 2356 { 2357 struct bond_vlan_tag *tags; 2358 struct net_device *upper; 2359 struct list_head *iter; 2360 2361 if (start_dev == end_dev) { 2362 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC); 2363 if (!tags) 2364 return ERR_PTR(-ENOMEM); 2365 tags[level].vlan_proto = VLAN_N_VID; 2366 return tags; 2367 } 2368 2369 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) { 2370 tags = bond_verify_device_path(upper, end_dev, level + 1); 2371 if (IS_ERR_OR_NULL(tags)) { 2372 if (IS_ERR(tags)) 2373 return tags; 2374 continue; 2375 } 2376 if (is_vlan_dev(upper)) { 2377 tags[level].vlan_proto = vlan_dev_vlan_proto(upper); 2378 tags[level].vlan_id = vlan_dev_vlan_id(upper); 2379 } 2380 2381 return tags; 2382 } 2383 2384 return NULL; 2385 } 2386 2387 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2388 { 2389 struct rtable *rt; 2390 struct bond_vlan_tag *tags; 2391 __be32 *targets = bond->params.arp_targets, addr; 2392 int i; 2393 2394 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) { 2395 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]); 2396 tags = NULL; 2397 2398 /* Find out through which dev should the packet go */ 2399 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 2400 RTO_ONLINK, 0); 2401 if (IS_ERR(rt)) { 2402 /* there's no route to target - try to send arp 2403 * probe to generate any traffic (arp_validate=0) 2404 */ 2405 if (bond->params.arp_validate) 2406 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n", 2407 bond->dev->name, 2408 &targets[i]); 2409 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2410 0, tags); 2411 continue; 2412 } 2413 2414 /* bond device itself */ 2415 if (rt->dst.dev == bond->dev) 2416 goto found; 2417 2418 rcu_read_lock(); 2419 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0); 2420 rcu_read_unlock(); 2421 2422 if (!IS_ERR_OR_NULL(tags)) 2423 goto found; 2424 2425 /* Not our device - skip */ 2426 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n", 2427 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL"); 2428 2429 ip_rt_put(rt); 2430 continue; 2431 2432 found: 2433 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0); 2434 ip_rt_put(rt); 2435 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2436 addr, tags); 2437 kfree(tags); 2438 } 2439 } 2440 2441 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 2442 { 2443 int i; 2444 2445 if (!sip || !bond_has_this_ip(bond, tip)) { 2446 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n", 2447 &sip, &tip); 2448 return; 2449 } 2450 2451 i = bond_get_targets_ip(bond->params.arp_targets, sip); 2452 if (i == -1) { 2453 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n", 2454 &sip); 2455 return; 2456 } 2457 slave->last_rx = jiffies; 2458 slave->target_last_arp_rx[i] = jiffies; 2459 } 2460 2461 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, 2462 struct slave *slave) 2463 { 2464 struct arphdr *arp = (struct arphdr *)skb->data; 2465 struct slave *curr_active_slave, *curr_arp_slave; 2466 unsigned char *arp_ptr; 2467 __be32 sip, tip; 2468 int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP); 2469 2470 if (!slave_do_arp_validate(bond, slave)) { 2471 if ((slave_do_arp_validate_only(bond) && is_arp) || 2472 !slave_do_arp_validate_only(bond)) 2473 slave->last_rx = jiffies; 2474 return RX_HANDLER_ANOTHER; 2475 } else if (!is_arp) { 2476 return RX_HANDLER_ANOTHER; 2477 } 2478 2479 alen = arp_hdr_len(bond->dev); 2480 2481 netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n", 2482 skb->dev->name); 2483 2484 if (alen > skb_headlen(skb)) { 2485 arp = kmalloc(alen, GFP_ATOMIC); 2486 if (!arp) 2487 goto out_unlock; 2488 if (skb_copy_bits(skb, 0, arp, alen) < 0) 2489 goto out_unlock; 2490 } 2491 2492 if (arp->ar_hln != bond->dev->addr_len || 2493 skb->pkt_type == PACKET_OTHERHOST || 2494 skb->pkt_type == PACKET_LOOPBACK || 2495 arp->ar_hrd != htons(ARPHRD_ETHER) || 2496 arp->ar_pro != htons(ETH_P_IP) || 2497 arp->ar_pln != 4) 2498 goto out_unlock; 2499 2500 arp_ptr = (unsigned char *)(arp + 1); 2501 arp_ptr += bond->dev->addr_len; 2502 memcpy(&sip, arp_ptr, 4); 2503 arp_ptr += 4 + bond->dev->addr_len; 2504 memcpy(&tip, arp_ptr, 4); 2505 2506 netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n", 2507 slave->dev->name, bond_slave_state(slave), 2508 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 2509 &sip, &tip); 2510 2511 curr_active_slave = rcu_dereference(bond->curr_active_slave); 2512 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 2513 2514 /* We 'trust' the received ARP enough to validate it if: 2515 * 2516 * (a) the slave receiving the ARP is active (which includes the 2517 * current ARP slave, if any), or 2518 * 2519 * (b) the receiving slave isn't active, but there is a currently 2520 * active slave and it received valid arp reply(s) after it became 2521 * the currently active slave, or 2522 * 2523 * (c) there is an ARP slave that sent an ARP during the prior ARP 2524 * interval, and we receive an ARP reply on any slave. We accept 2525 * these because switch FDB update delays may deliver the ARP 2526 * reply to a slave other than the sender of the ARP request. 2527 * 2528 * Note: for (b), backup slaves are receiving the broadcast ARP 2529 * request, not a reply. This request passes from the sending 2530 * slave through the L2 switch(es) to the receiving slave. Since 2531 * this is checking the request, sip/tip are swapped for 2532 * validation. 2533 * 2534 * This is done to avoid endless looping when we can't reach the 2535 * arp_ip_target and fool ourselves with our own arp requests. 2536 */ 2537 if (bond_is_active_slave(slave)) 2538 bond_validate_arp(bond, slave, sip, tip); 2539 else if (curr_active_slave && 2540 time_after(slave_last_rx(bond, curr_active_slave), 2541 curr_active_slave->last_link_up)) 2542 bond_validate_arp(bond, slave, tip, sip); 2543 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) && 2544 bond_time_in_interval(bond, 2545 dev_trans_start(curr_arp_slave->dev), 1)) 2546 bond_validate_arp(bond, slave, sip, tip); 2547 2548 out_unlock: 2549 if (arp != (struct arphdr *)skb->data) 2550 kfree(arp); 2551 return RX_HANDLER_ANOTHER; 2552 } 2553 2554 /* function to verify if we're in the arp_interval timeslice, returns true if 2555 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval + 2556 * arp_interval/2) . the arp_interval/2 is needed for really fast networks. 2557 */ 2558 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 2559 int mod) 2560 { 2561 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2562 2563 return time_in_range(jiffies, 2564 last_act - delta_in_ticks, 2565 last_act + mod * delta_in_ticks + delta_in_ticks/2); 2566 } 2567 2568 /* This function is called regularly to monitor each slave's link 2569 * ensuring that traffic is being sent and received when arp monitoring 2570 * is used in load-balancing mode. if the adapter has been dormant, then an 2571 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 2572 * arp monitoring in active backup mode. 2573 */ 2574 static void bond_loadbalance_arp_mon(struct work_struct *work) 2575 { 2576 struct bonding *bond = container_of(work, struct bonding, 2577 arp_work.work); 2578 struct slave *slave, *oldcurrent; 2579 struct list_head *iter; 2580 int do_failover = 0, slave_state_changed = 0; 2581 2582 if (!bond_has_slaves(bond)) 2583 goto re_arm; 2584 2585 rcu_read_lock(); 2586 2587 oldcurrent = rcu_dereference(bond->curr_active_slave); 2588 /* see if any of the previous devices are up now (i.e. they have 2589 * xmt and rcv traffic). the curr_active_slave does not come into 2590 * the picture unless it is null. also, slave->last_link_up is not 2591 * needed here because we send an arp on each slave and give a slave 2592 * as long as it needs to get the tx/rx within the delta. 2593 * TODO: what about up/down delay in arp mode? it wasn't here before 2594 * so it can wait 2595 */ 2596 bond_for_each_slave_rcu(bond, slave, iter) { 2597 unsigned long trans_start = dev_trans_start(slave->dev); 2598 2599 if (slave->link != BOND_LINK_UP) { 2600 if (bond_time_in_interval(bond, trans_start, 1) && 2601 bond_time_in_interval(bond, slave->last_rx, 1)) { 2602 2603 slave->link = BOND_LINK_UP; 2604 slave_state_changed = 1; 2605 2606 /* primary_slave has no meaning in round-robin 2607 * mode. the window of a slave being up and 2608 * curr_active_slave being null after enslaving 2609 * is closed. 2610 */ 2611 if (!oldcurrent) { 2612 netdev_info(bond->dev, "link status definitely up for interface %s\n", 2613 slave->dev->name); 2614 do_failover = 1; 2615 } else { 2616 netdev_info(bond->dev, "interface %s is now up\n", 2617 slave->dev->name); 2618 } 2619 } 2620 } else { 2621 /* slave->link == BOND_LINK_UP */ 2622 2623 /* not all switches will respond to an arp request 2624 * when the source ip is 0, so don't take the link down 2625 * if we don't know our ip yet 2626 */ 2627 if (!bond_time_in_interval(bond, trans_start, 2) || 2628 !bond_time_in_interval(bond, slave->last_rx, 2)) { 2629 2630 slave->link = BOND_LINK_DOWN; 2631 slave_state_changed = 1; 2632 2633 if (slave->link_failure_count < UINT_MAX) 2634 slave->link_failure_count++; 2635 2636 netdev_info(bond->dev, "interface %s is now down\n", 2637 slave->dev->name); 2638 2639 if (slave == oldcurrent) 2640 do_failover = 1; 2641 } 2642 } 2643 2644 /* note: if switch is in round-robin mode, all links 2645 * must tx arp to ensure all links rx an arp - otherwise 2646 * links may oscillate or not come up at all; if switch is 2647 * in something like xor mode, there is nothing we can 2648 * do - all replies will be rx'ed on same link causing slaves 2649 * to be unstable during low/no traffic periods 2650 */ 2651 if (bond_slave_is_up(slave)) 2652 bond_arp_send_all(bond, slave); 2653 } 2654 2655 rcu_read_unlock(); 2656 2657 if (do_failover || slave_state_changed) { 2658 if (!rtnl_trylock()) 2659 goto re_arm; 2660 2661 if (slave_state_changed) { 2662 bond_slave_state_change(bond); 2663 if (BOND_MODE(bond) == BOND_MODE_XOR) 2664 bond_update_slave_arr(bond, NULL); 2665 } 2666 if (do_failover) { 2667 block_netpoll_tx(); 2668 bond_select_active_slave(bond); 2669 unblock_netpoll_tx(); 2670 } 2671 rtnl_unlock(); 2672 } 2673 2674 re_arm: 2675 if (bond->params.arp_interval) 2676 queue_delayed_work(bond->wq, &bond->arp_work, 2677 msecs_to_jiffies(bond->params.arp_interval)); 2678 } 2679 2680 /* Called to inspect slaves for active-backup mode ARP monitor link state 2681 * changes. Sets new_link in slaves to specify what action should take 2682 * place for the slave. Returns 0 if no changes are found, >0 if changes 2683 * to link states must be committed. 2684 * 2685 * Called with rcu_read_lock held. 2686 */ 2687 static int bond_ab_arp_inspect(struct bonding *bond) 2688 { 2689 unsigned long trans_start, last_rx; 2690 struct list_head *iter; 2691 struct slave *slave; 2692 int commit = 0; 2693 2694 bond_for_each_slave_rcu(bond, slave, iter) { 2695 slave->new_link = BOND_LINK_NOCHANGE; 2696 last_rx = slave_last_rx(bond, slave); 2697 2698 if (slave->link != BOND_LINK_UP) { 2699 if (bond_time_in_interval(bond, last_rx, 1)) { 2700 slave->new_link = BOND_LINK_UP; 2701 commit++; 2702 } 2703 continue; 2704 } 2705 2706 /* Give slaves 2*delta after being enslaved or made 2707 * active. This avoids bouncing, as the last receive 2708 * times need a full ARP monitor cycle to be updated. 2709 */ 2710 if (bond_time_in_interval(bond, slave->last_link_up, 2)) 2711 continue; 2712 2713 /* Backup slave is down if: 2714 * - No current_arp_slave AND 2715 * - more than 3*delta since last receive AND 2716 * - the bond has an IP address 2717 * 2718 * Note: a non-null current_arp_slave indicates 2719 * the curr_active_slave went down and we are 2720 * searching for a new one; under this condition 2721 * we only take the curr_active_slave down - this 2722 * gives each slave a chance to tx/rx traffic 2723 * before being taken out 2724 */ 2725 if (!bond_is_active_slave(slave) && 2726 !rcu_access_pointer(bond->current_arp_slave) && 2727 !bond_time_in_interval(bond, last_rx, 3)) { 2728 slave->new_link = BOND_LINK_DOWN; 2729 commit++; 2730 } 2731 2732 /* Active slave is down if: 2733 * - more than 2*delta since transmitting OR 2734 * - (more than 2*delta since receive AND 2735 * the bond has an IP address) 2736 */ 2737 trans_start = dev_trans_start(slave->dev); 2738 if (bond_is_active_slave(slave) && 2739 (!bond_time_in_interval(bond, trans_start, 2) || 2740 !bond_time_in_interval(bond, last_rx, 2))) { 2741 slave->new_link = BOND_LINK_DOWN; 2742 commit++; 2743 } 2744 } 2745 2746 return commit; 2747 } 2748 2749 /* Called to commit link state changes noted by inspection step of 2750 * active-backup mode ARP monitor. 2751 * 2752 * Called with RTNL hold. 2753 */ 2754 static void bond_ab_arp_commit(struct bonding *bond) 2755 { 2756 unsigned long trans_start; 2757 struct list_head *iter; 2758 struct slave *slave; 2759 2760 bond_for_each_slave(bond, slave, iter) { 2761 switch (slave->new_link) { 2762 case BOND_LINK_NOCHANGE: 2763 continue; 2764 2765 case BOND_LINK_UP: 2766 trans_start = dev_trans_start(slave->dev); 2767 if (rtnl_dereference(bond->curr_active_slave) != slave || 2768 (!rtnl_dereference(bond->curr_active_slave) && 2769 bond_time_in_interval(bond, trans_start, 1))) { 2770 struct slave *current_arp_slave; 2771 2772 current_arp_slave = rtnl_dereference(bond->current_arp_slave); 2773 bond_set_slave_link_state(slave, BOND_LINK_UP, 2774 BOND_SLAVE_NOTIFY_NOW); 2775 if (current_arp_slave) { 2776 bond_set_slave_inactive_flags( 2777 current_arp_slave, 2778 BOND_SLAVE_NOTIFY_NOW); 2779 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2780 } 2781 2782 netdev_info(bond->dev, "link status definitely up for interface %s\n", 2783 slave->dev->name); 2784 2785 if (!rtnl_dereference(bond->curr_active_slave) || 2786 slave == rtnl_dereference(bond->primary_slave)) 2787 goto do_failover; 2788 2789 } 2790 2791 continue; 2792 2793 case BOND_LINK_DOWN: 2794 if (slave->link_failure_count < UINT_MAX) 2795 slave->link_failure_count++; 2796 2797 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2798 BOND_SLAVE_NOTIFY_NOW); 2799 bond_set_slave_inactive_flags(slave, 2800 BOND_SLAVE_NOTIFY_NOW); 2801 2802 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n", 2803 slave->dev->name); 2804 2805 if (slave == rtnl_dereference(bond->curr_active_slave)) { 2806 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2807 goto do_failover; 2808 } 2809 2810 continue; 2811 2812 default: 2813 netdev_err(bond->dev, "impossible: new_link %d on slave %s\n", 2814 slave->new_link, slave->dev->name); 2815 continue; 2816 } 2817 2818 do_failover: 2819 block_netpoll_tx(); 2820 bond_select_active_slave(bond); 2821 unblock_netpoll_tx(); 2822 } 2823 2824 bond_set_carrier(bond); 2825 } 2826 2827 /* Send ARP probes for active-backup mode ARP monitor. 2828 * 2829 * Called with rcu_read_lock held. 2830 */ 2831 static bool bond_ab_arp_probe(struct bonding *bond) 2832 { 2833 struct slave *slave, *before = NULL, *new_slave = NULL, 2834 *curr_arp_slave = rcu_dereference(bond->current_arp_slave), 2835 *curr_active_slave = rcu_dereference(bond->curr_active_slave); 2836 struct list_head *iter; 2837 bool found = false; 2838 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; 2839 2840 if (curr_arp_slave && curr_active_slave) 2841 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n", 2842 curr_arp_slave->dev->name, 2843 curr_active_slave->dev->name); 2844 2845 if (curr_active_slave) { 2846 bond_arp_send_all(bond, curr_active_slave); 2847 return should_notify_rtnl; 2848 } 2849 2850 /* if we don't have a curr_active_slave, search for the next available 2851 * backup slave from the current_arp_slave and make it the candidate 2852 * for becoming the curr_active_slave 2853 */ 2854 2855 if (!curr_arp_slave) { 2856 curr_arp_slave = bond_first_slave_rcu(bond); 2857 if (!curr_arp_slave) 2858 return should_notify_rtnl; 2859 } 2860 2861 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER); 2862 2863 bond_for_each_slave_rcu(bond, slave, iter) { 2864 if (!found && !before && bond_slave_is_up(slave)) 2865 before = slave; 2866 2867 if (found && !new_slave && bond_slave_is_up(slave)) 2868 new_slave = slave; 2869 /* if the link state is up at this point, we 2870 * mark it down - this can happen if we have 2871 * simultaneous link failures and 2872 * reselect_active_interface doesn't make this 2873 * one the current slave so it is still marked 2874 * up when it is actually down 2875 */ 2876 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 2877 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2878 BOND_SLAVE_NOTIFY_LATER); 2879 if (slave->link_failure_count < UINT_MAX) 2880 slave->link_failure_count++; 2881 2882 bond_set_slave_inactive_flags(slave, 2883 BOND_SLAVE_NOTIFY_LATER); 2884 2885 netdev_info(bond->dev, "backup interface %s is now down\n", 2886 slave->dev->name); 2887 } 2888 if (slave == curr_arp_slave) 2889 found = true; 2890 } 2891 2892 if (!new_slave && before) 2893 new_slave = before; 2894 2895 if (!new_slave) 2896 goto check_state; 2897 2898 bond_set_slave_link_state(new_slave, BOND_LINK_BACK, 2899 BOND_SLAVE_NOTIFY_LATER); 2900 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER); 2901 bond_arp_send_all(bond, new_slave); 2902 new_slave->last_link_up = jiffies; 2903 rcu_assign_pointer(bond->current_arp_slave, new_slave); 2904 2905 check_state: 2906 bond_for_each_slave_rcu(bond, slave, iter) { 2907 if (slave->should_notify || slave->should_notify_link) { 2908 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; 2909 break; 2910 } 2911 } 2912 return should_notify_rtnl; 2913 } 2914 2915 static void bond_activebackup_arp_mon(struct work_struct *work) 2916 { 2917 struct bonding *bond = container_of(work, struct bonding, 2918 arp_work.work); 2919 bool should_notify_peers = false; 2920 bool should_notify_rtnl = false; 2921 int delta_in_ticks; 2922 2923 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2924 2925 if (!bond_has_slaves(bond)) 2926 goto re_arm; 2927 2928 rcu_read_lock(); 2929 2930 should_notify_peers = bond_should_notify_peers(bond); 2931 2932 if (bond_ab_arp_inspect(bond)) { 2933 rcu_read_unlock(); 2934 2935 /* Race avoidance with bond_close flush of workqueue */ 2936 if (!rtnl_trylock()) { 2937 delta_in_ticks = 1; 2938 should_notify_peers = false; 2939 goto re_arm; 2940 } 2941 2942 bond_ab_arp_commit(bond); 2943 2944 rtnl_unlock(); 2945 rcu_read_lock(); 2946 } 2947 2948 should_notify_rtnl = bond_ab_arp_probe(bond); 2949 rcu_read_unlock(); 2950 2951 re_arm: 2952 if (bond->params.arp_interval) 2953 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 2954 2955 if (should_notify_peers || should_notify_rtnl) { 2956 if (!rtnl_trylock()) 2957 return; 2958 2959 if (should_notify_peers) 2960 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 2961 bond->dev); 2962 if (should_notify_rtnl) { 2963 bond_slave_state_notify(bond); 2964 bond_slave_link_notify(bond); 2965 } 2966 2967 rtnl_unlock(); 2968 } 2969 } 2970 2971 /*-------------------------- netdev event handling --------------------------*/ 2972 2973 /* Change device name */ 2974 static int bond_event_changename(struct bonding *bond) 2975 { 2976 bond_remove_proc_entry(bond); 2977 bond_create_proc_entry(bond); 2978 2979 bond_debug_reregister(bond); 2980 2981 return NOTIFY_DONE; 2982 } 2983 2984 static int bond_master_netdev_event(unsigned long event, 2985 struct net_device *bond_dev) 2986 { 2987 struct bonding *event_bond = netdev_priv(bond_dev); 2988 2989 switch (event) { 2990 case NETDEV_CHANGENAME: 2991 return bond_event_changename(event_bond); 2992 case NETDEV_UNREGISTER: 2993 bond_remove_proc_entry(event_bond); 2994 break; 2995 case NETDEV_REGISTER: 2996 bond_create_proc_entry(event_bond); 2997 break; 2998 case NETDEV_NOTIFY_PEERS: 2999 if (event_bond->send_peer_notif) 3000 event_bond->send_peer_notif--; 3001 break; 3002 default: 3003 break; 3004 } 3005 3006 return NOTIFY_DONE; 3007 } 3008 3009 static int bond_slave_netdev_event(unsigned long event, 3010 struct net_device *slave_dev) 3011 { 3012 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary; 3013 struct bonding *bond; 3014 struct net_device *bond_dev; 3015 3016 /* A netdev event can be generated while enslaving a device 3017 * before netdev_rx_handler_register is called in which case 3018 * slave will be NULL 3019 */ 3020 if (!slave) 3021 return NOTIFY_DONE; 3022 bond_dev = slave->bond->dev; 3023 bond = slave->bond; 3024 primary = rtnl_dereference(bond->primary_slave); 3025 3026 switch (event) { 3027 case NETDEV_UNREGISTER: 3028 if (bond_dev->type != ARPHRD_ETHER) 3029 bond_release_and_destroy(bond_dev, slave_dev); 3030 else 3031 bond_release(bond_dev, slave_dev); 3032 break; 3033 case NETDEV_UP: 3034 case NETDEV_CHANGE: 3035 bond_update_speed_duplex(slave); 3036 if (BOND_MODE(bond) == BOND_MODE_8023AD) 3037 bond_3ad_adapter_speed_duplex_changed(slave); 3038 /* Fallthrough */ 3039 case NETDEV_DOWN: 3040 /* Refresh slave-array if applicable! 3041 * If the setup does not use miimon or arpmon (mode-specific!), 3042 * then these events will not cause the slave-array to be 3043 * refreshed. This will cause xmit to use a slave that is not 3044 * usable. Avoid such situation by refeshing the array at these 3045 * events. If these (miimon/arpmon) parameters are configured 3046 * then array gets refreshed twice and that should be fine! 3047 */ 3048 if (bond_mode_uses_xmit_hash(bond)) 3049 bond_update_slave_arr(bond, NULL); 3050 break; 3051 case NETDEV_CHANGEMTU: 3052 /* TODO: Should slaves be allowed to 3053 * independently alter their MTU? For 3054 * an active-backup bond, slaves need 3055 * not be the same type of device, so 3056 * MTUs may vary. For other modes, 3057 * slaves arguably should have the 3058 * same MTUs. To do this, we'd need to 3059 * take over the slave's change_mtu 3060 * function for the duration of their 3061 * servitude. 3062 */ 3063 break; 3064 case NETDEV_CHANGENAME: 3065 /* we don't care if we don't have primary set */ 3066 if (!bond_uses_primary(bond) || 3067 !bond->params.primary[0]) 3068 break; 3069 3070 if (slave == primary) { 3071 /* slave's name changed - he's no longer primary */ 3072 RCU_INIT_POINTER(bond->primary_slave, NULL); 3073 } else if (!strcmp(slave_dev->name, bond->params.primary)) { 3074 /* we have a new primary slave */ 3075 rcu_assign_pointer(bond->primary_slave, slave); 3076 } else { /* we didn't change primary - exit */ 3077 break; 3078 } 3079 3080 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n", 3081 primary ? slave_dev->name : "none"); 3082 3083 block_netpoll_tx(); 3084 bond_select_active_slave(bond); 3085 unblock_netpoll_tx(); 3086 break; 3087 case NETDEV_FEAT_CHANGE: 3088 bond_compute_features(bond); 3089 break; 3090 case NETDEV_RESEND_IGMP: 3091 /* Propagate to master device */ 3092 call_netdevice_notifiers(event, slave->bond->dev); 3093 break; 3094 default: 3095 break; 3096 } 3097 3098 return NOTIFY_DONE; 3099 } 3100 3101 /* bond_netdev_event: handle netdev notifier chain events. 3102 * 3103 * This function receives events for the netdev chain. The caller (an 3104 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 3105 * locks for us to safely manipulate the slave devices (RTNL lock, 3106 * dev_probe_lock). 3107 */ 3108 static int bond_netdev_event(struct notifier_block *this, 3109 unsigned long event, void *ptr) 3110 { 3111 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 3112 3113 netdev_dbg(event_dev, "event: %lx\n", event); 3114 3115 if (!(event_dev->priv_flags & IFF_BONDING)) 3116 return NOTIFY_DONE; 3117 3118 if (event_dev->flags & IFF_MASTER) { 3119 netdev_dbg(event_dev, "IFF_MASTER\n"); 3120 return bond_master_netdev_event(event, event_dev); 3121 } 3122 3123 if (event_dev->flags & IFF_SLAVE) { 3124 netdev_dbg(event_dev, "IFF_SLAVE\n"); 3125 return bond_slave_netdev_event(event, event_dev); 3126 } 3127 3128 return NOTIFY_DONE; 3129 } 3130 3131 static struct notifier_block bond_netdev_notifier = { 3132 .notifier_call = bond_netdev_event, 3133 }; 3134 3135 /*---------------------------- Hashing Policies -----------------------------*/ 3136 3137 /* L2 hash helper */ 3138 static inline u32 bond_eth_hash(struct sk_buff *skb) 3139 { 3140 struct ethhdr *ep, hdr_tmp; 3141 3142 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp); 3143 if (ep) 3144 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto; 3145 return 0; 3146 } 3147 3148 /* Extract the appropriate headers based on bond's xmit policy */ 3149 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, 3150 struct flow_keys *fk) 3151 { 3152 const struct ipv6hdr *iph6; 3153 const struct iphdr *iph; 3154 int noff, proto = -1; 3155 3156 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23) 3157 return skb_flow_dissect_flow_keys(skb, fk, 0); 3158 3159 fk->ports.ports = 0; 3160 noff = skb_network_offset(skb); 3161 if (skb->protocol == htons(ETH_P_IP)) { 3162 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph)))) 3163 return false; 3164 iph = ip_hdr(skb); 3165 iph_to_flow_copy_v4addrs(fk, iph); 3166 noff += iph->ihl << 2; 3167 if (!ip_is_fragment(iph)) 3168 proto = iph->protocol; 3169 } else if (skb->protocol == htons(ETH_P_IPV6)) { 3170 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6)))) 3171 return false; 3172 iph6 = ipv6_hdr(skb); 3173 iph_to_flow_copy_v6addrs(fk, iph6); 3174 noff += sizeof(*iph6); 3175 proto = iph6->nexthdr; 3176 } else { 3177 return false; 3178 } 3179 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0) 3180 fk->ports.ports = skb_flow_get_ports(skb, noff, proto); 3181 3182 return true; 3183 } 3184 3185 /** 3186 * bond_xmit_hash - generate a hash value based on the xmit policy 3187 * @bond: bonding device 3188 * @skb: buffer to use for headers 3189 * 3190 * This function will extract the necessary headers from the skb buffer and use 3191 * them to generate a hash based on the xmit_policy set in the bonding device 3192 */ 3193 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb) 3194 { 3195 struct flow_keys flow; 3196 u32 hash; 3197 3198 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 && 3199 skb->l4_hash) 3200 return skb->hash; 3201 3202 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 || 3203 !bond_flow_dissect(bond, skb, &flow)) 3204 return bond_eth_hash(skb); 3205 3206 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 || 3207 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) 3208 hash = bond_eth_hash(skb); 3209 else 3210 hash = (__force u32)flow.ports.ports; 3211 hash ^= (__force u32)flow_get_u32_dst(&flow) ^ 3212 (__force u32)flow_get_u32_src(&flow); 3213 hash ^= (hash >> 16); 3214 hash ^= (hash >> 8); 3215 3216 return hash; 3217 } 3218 3219 /*-------------------------- Device entry points ----------------------------*/ 3220 3221 static void bond_work_init_all(struct bonding *bond) 3222 { 3223 INIT_DELAYED_WORK(&bond->mcast_work, 3224 bond_resend_igmp_join_requests_delayed); 3225 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 3226 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 3227 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3228 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon); 3229 else 3230 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon); 3231 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 3232 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler); 3233 } 3234 3235 static void bond_work_cancel_all(struct bonding *bond) 3236 { 3237 cancel_delayed_work_sync(&bond->mii_work); 3238 cancel_delayed_work_sync(&bond->arp_work); 3239 cancel_delayed_work_sync(&bond->alb_work); 3240 cancel_delayed_work_sync(&bond->ad_work); 3241 cancel_delayed_work_sync(&bond->mcast_work); 3242 cancel_delayed_work_sync(&bond->slave_arr_work); 3243 } 3244 3245 static int bond_open(struct net_device *bond_dev) 3246 { 3247 struct bonding *bond = netdev_priv(bond_dev); 3248 struct list_head *iter; 3249 struct slave *slave; 3250 3251 /* reset slave->backup and slave->inactive */ 3252 if (bond_has_slaves(bond)) { 3253 bond_for_each_slave(bond, slave, iter) { 3254 if (bond_uses_primary(bond) && 3255 slave != rcu_access_pointer(bond->curr_active_slave)) { 3256 bond_set_slave_inactive_flags(slave, 3257 BOND_SLAVE_NOTIFY_NOW); 3258 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) { 3259 bond_set_slave_active_flags(slave, 3260 BOND_SLAVE_NOTIFY_NOW); 3261 } 3262 } 3263 } 3264 3265 bond_work_init_all(bond); 3266 3267 if (bond_is_lb(bond)) { 3268 /* bond_alb_initialize must be called before the timer 3269 * is started. 3270 */ 3271 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB))) 3272 return -ENOMEM; 3273 if (bond->params.tlb_dynamic_lb) 3274 queue_delayed_work(bond->wq, &bond->alb_work, 0); 3275 } 3276 3277 if (bond->params.miimon) /* link check interval, in milliseconds. */ 3278 queue_delayed_work(bond->wq, &bond->mii_work, 0); 3279 3280 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 3281 queue_delayed_work(bond->wq, &bond->arp_work, 0); 3282 bond->recv_probe = bond_arp_rcv; 3283 } 3284 3285 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3286 queue_delayed_work(bond->wq, &bond->ad_work, 0); 3287 /* register to receive LACPDUs */ 3288 bond->recv_probe = bond_3ad_lacpdu_recv; 3289 bond_3ad_initiate_agg_selection(bond, 1); 3290 } 3291 3292 if (bond_mode_uses_xmit_hash(bond)) 3293 bond_update_slave_arr(bond, NULL); 3294 3295 return 0; 3296 } 3297 3298 static int bond_close(struct net_device *bond_dev) 3299 { 3300 struct bonding *bond = netdev_priv(bond_dev); 3301 3302 bond_work_cancel_all(bond); 3303 bond->send_peer_notif = 0; 3304 if (bond_is_lb(bond)) 3305 bond_alb_deinitialize(bond); 3306 bond->recv_probe = NULL; 3307 3308 return 0; 3309 } 3310 3311 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev, 3312 struct rtnl_link_stats64 *stats) 3313 { 3314 struct bonding *bond = netdev_priv(bond_dev); 3315 struct rtnl_link_stats64 temp; 3316 struct list_head *iter; 3317 struct slave *slave; 3318 3319 memcpy(stats, &bond->bond_stats, sizeof(*stats)); 3320 3321 bond_for_each_slave(bond, slave, iter) { 3322 const struct rtnl_link_stats64 *sstats = 3323 dev_get_stats(slave->dev, &temp); 3324 struct rtnl_link_stats64 *pstats = &slave->slave_stats; 3325 3326 stats->rx_packets += sstats->rx_packets - pstats->rx_packets; 3327 stats->rx_bytes += sstats->rx_bytes - pstats->rx_bytes; 3328 stats->rx_errors += sstats->rx_errors - pstats->rx_errors; 3329 stats->rx_dropped += sstats->rx_dropped - pstats->rx_dropped; 3330 3331 stats->tx_packets += sstats->tx_packets - pstats->tx_packets;; 3332 stats->tx_bytes += sstats->tx_bytes - pstats->tx_bytes; 3333 stats->tx_errors += sstats->tx_errors - pstats->tx_errors; 3334 stats->tx_dropped += sstats->tx_dropped - pstats->tx_dropped; 3335 3336 stats->multicast += sstats->multicast - pstats->multicast; 3337 stats->collisions += sstats->collisions - pstats->collisions; 3338 3339 stats->rx_length_errors += sstats->rx_length_errors - pstats->rx_length_errors; 3340 stats->rx_over_errors += sstats->rx_over_errors - pstats->rx_over_errors; 3341 stats->rx_crc_errors += sstats->rx_crc_errors - pstats->rx_crc_errors; 3342 stats->rx_frame_errors += sstats->rx_frame_errors - pstats->rx_frame_errors; 3343 stats->rx_fifo_errors += sstats->rx_fifo_errors - pstats->rx_fifo_errors; 3344 stats->rx_missed_errors += sstats->rx_missed_errors - pstats->rx_missed_errors; 3345 3346 stats->tx_aborted_errors += sstats->tx_aborted_errors - pstats->tx_aborted_errors; 3347 stats->tx_carrier_errors += sstats->tx_carrier_errors - pstats->tx_carrier_errors; 3348 stats->tx_fifo_errors += sstats->tx_fifo_errors - pstats->tx_fifo_errors; 3349 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors - pstats->tx_heartbeat_errors; 3350 stats->tx_window_errors += sstats->tx_window_errors - pstats->tx_window_errors; 3351 3352 /* save off the slave stats for the next run */ 3353 memcpy(pstats, sstats, sizeof(*sstats)); 3354 } 3355 memcpy(&bond->bond_stats, stats, sizeof(*stats)); 3356 3357 return stats; 3358 } 3359 3360 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 3361 { 3362 struct bonding *bond = netdev_priv(bond_dev); 3363 struct net_device *slave_dev = NULL; 3364 struct ifbond k_binfo; 3365 struct ifbond __user *u_binfo = NULL; 3366 struct ifslave k_sinfo; 3367 struct ifslave __user *u_sinfo = NULL; 3368 struct mii_ioctl_data *mii = NULL; 3369 struct bond_opt_value newval; 3370 struct net *net; 3371 int res = 0; 3372 3373 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd); 3374 3375 switch (cmd) { 3376 case SIOCGMIIPHY: 3377 mii = if_mii(ifr); 3378 if (!mii) 3379 return -EINVAL; 3380 3381 mii->phy_id = 0; 3382 /* Fall Through */ 3383 case SIOCGMIIREG: 3384 /* We do this again just in case we were called by SIOCGMIIREG 3385 * instead of SIOCGMIIPHY. 3386 */ 3387 mii = if_mii(ifr); 3388 if (!mii) 3389 return -EINVAL; 3390 3391 if (mii->reg_num == 1) { 3392 mii->val_out = 0; 3393 if (netif_carrier_ok(bond->dev)) 3394 mii->val_out = BMSR_LSTATUS; 3395 } 3396 3397 return 0; 3398 case BOND_INFO_QUERY_OLD: 3399 case SIOCBONDINFOQUERY: 3400 u_binfo = (struct ifbond __user *)ifr->ifr_data; 3401 3402 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 3403 return -EFAULT; 3404 3405 res = bond_info_query(bond_dev, &k_binfo); 3406 if (res == 0 && 3407 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 3408 return -EFAULT; 3409 3410 return res; 3411 case BOND_SLAVE_INFO_QUERY_OLD: 3412 case SIOCBONDSLAVEINFOQUERY: 3413 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 3414 3415 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 3416 return -EFAULT; 3417 3418 res = bond_slave_info_query(bond_dev, &k_sinfo); 3419 if (res == 0 && 3420 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 3421 return -EFAULT; 3422 3423 return res; 3424 default: 3425 break; 3426 } 3427 3428 net = dev_net(bond_dev); 3429 3430 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3431 return -EPERM; 3432 3433 slave_dev = __dev_get_by_name(net, ifr->ifr_slave); 3434 3435 netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev); 3436 3437 if (!slave_dev) 3438 return -ENODEV; 3439 3440 netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name); 3441 switch (cmd) { 3442 case BOND_ENSLAVE_OLD: 3443 case SIOCBONDENSLAVE: 3444 res = bond_enslave(bond_dev, slave_dev); 3445 break; 3446 case BOND_RELEASE_OLD: 3447 case SIOCBONDRELEASE: 3448 res = bond_release(bond_dev, slave_dev); 3449 break; 3450 case BOND_SETHWADDR_OLD: 3451 case SIOCBONDSETHWADDR: 3452 bond_set_dev_addr(bond_dev, slave_dev); 3453 res = 0; 3454 break; 3455 case BOND_CHANGE_ACTIVE_OLD: 3456 case SIOCBONDCHANGEACTIVE: 3457 bond_opt_initstr(&newval, slave_dev->name); 3458 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval); 3459 break; 3460 default: 3461 res = -EOPNOTSUPP; 3462 } 3463 3464 return res; 3465 } 3466 3467 static void bond_change_rx_flags(struct net_device *bond_dev, int change) 3468 { 3469 struct bonding *bond = netdev_priv(bond_dev); 3470 3471 if (change & IFF_PROMISC) 3472 bond_set_promiscuity(bond, 3473 bond_dev->flags & IFF_PROMISC ? 1 : -1); 3474 3475 if (change & IFF_ALLMULTI) 3476 bond_set_allmulti(bond, 3477 bond_dev->flags & IFF_ALLMULTI ? 1 : -1); 3478 } 3479 3480 static void bond_set_rx_mode(struct net_device *bond_dev) 3481 { 3482 struct bonding *bond = netdev_priv(bond_dev); 3483 struct list_head *iter; 3484 struct slave *slave; 3485 3486 rcu_read_lock(); 3487 if (bond_uses_primary(bond)) { 3488 slave = rcu_dereference(bond->curr_active_slave); 3489 if (slave) { 3490 dev_uc_sync(slave->dev, bond_dev); 3491 dev_mc_sync(slave->dev, bond_dev); 3492 } 3493 } else { 3494 bond_for_each_slave_rcu(bond, slave, iter) { 3495 dev_uc_sync_multiple(slave->dev, bond_dev); 3496 dev_mc_sync_multiple(slave->dev, bond_dev); 3497 } 3498 } 3499 rcu_read_unlock(); 3500 } 3501 3502 static int bond_neigh_init(struct neighbour *n) 3503 { 3504 struct bonding *bond = netdev_priv(n->dev); 3505 const struct net_device_ops *slave_ops; 3506 struct neigh_parms parms; 3507 struct slave *slave; 3508 int ret; 3509 3510 slave = bond_first_slave(bond); 3511 if (!slave) 3512 return 0; 3513 slave_ops = slave->dev->netdev_ops; 3514 if (!slave_ops->ndo_neigh_setup) 3515 return 0; 3516 3517 parms.neigh_setup = NULL; 3518 parms.neigh_cleanup = NULL; 3519 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); 3520 if (ret) 3521 return ret; 3522 3523 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called 3524 * after the last slave has been detached. Assumes that all slaves 3525 * utilize the same neigh_cleanup (true at this writing as only user 3526 * is ipoib). 3527 */ 3528 n->parms->neigh_cleanup = parms.neigh_cleanup; 3529 3530 if (!parms.neigh_setup) 3531 return 0; 3532 3533 return parms.neigh_setup(n); 3534 } 3535 3536 /* The bonding ndo_neigh_setup is called at init time beofre any 3537 * slave exists. So we must declare proxy setup function which will 3538 * be used at run time to resolve the actual slave neigh param setup. 3539 * 3540 * It's also called by master devices (such as vlans) to setup their 3541 * underlying devices. In that case - do nothing, we're already set up from 3542 * our init. 3543 */ 3544 static int bond_neigh_setup(struct net_device *dev, 3545 struct neigh_parms *parms) 3546 { 3547 /* modify only our neigh_parms */ 3548 if (parms->dev == dev) 3549 parms->neigh_setup = bond_neigh_init; 3550 3551 return 0; 3552 } 3553 3554 /* Change the MTU of all of a master's slaves to match the master */ 3555 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 3556 { 3557 struct bonding *bond = netdev_priv(bond_dev); 3558 struct slave *slave, *rollback_slave; 3559 struct list_head *iter; 3560 int res = 0; 3561 3562 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu); 3563 3564 bond_for_each_slave(bond, slave, iter) { 3565 netdev_dbg(bond_dev, "s %p c_m %p\n", 3566 slave, slave->dev->netdev_ops->ndo_change_mtu); 3567 3568 res = dev_set_mtu(slave->dev, new_mtu); 3569 3570 if (res) { 3571 /* If we failed to set the slave's mtu to the new value 3572 * we must abort the operation even in ACTIVE_BACKUP 3573 * mode, because if we allow the backup slaves to have 3574 * different mtu values than the active slave we'll 3575 * need to change their mtu when doing a failover. That 3576 * means changing their mtu from timer context, which 3577 * is probably not a good idea. 3578 */ 3579 netdev_dbg(bond_dev, "err %d %s\n", res, 3580 slave->dev->name); 3581 goto unwind; 3582 } 3583 } 3584 3585 bond_dev->mtu = new_mtu; 3586 3587 return 0; 3588 3589 unwind: 3590 /* unwind from head to the slave that failed */ 3591 bond_for_each_slave(bond, rollback_slave, iter) { 3592 int tmp_res; 3593 3594 if (rollback_slave == slave) 3595 break; 3596 3597 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu); 3598 if (tmp_res) { 3599 netdev_dbg(bond_dev, "unwind err %d dev %s\n", 3600 tmp_res, rollback_slave->dev->name); 3601 } 3602 } 3603 3604 return res; 3605 } 3606 3607 /* Change HW address 3608 * 3609 * Note that many devices must be down to change the HW address, and 3610 * downing the master releases all slaves. We can make bonds full of 3611 * bonding devices to test this, however. 3612 */ 3613 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 3614 { 3615 struct bonding *bond = netdev_priv(bond_dev); 3616 struct slave *slave, *rollback_slave; 3617 struct sockaddr *sa = addr, tmp_sa; 3618 struct list_head *iter; 3619 int res = 0; 3620 3621 if (BOND_MODE(bond) == BOND_MODE_ALB) 3622 return bond_alb_set_mac_address(bond_dev, addr); 3623 3624 3625 netdev_dbg(bond_dev, "bond=%p\n", bond); 3626 3627 /* If fail_over_mac is enabled, do nothing and return success. 3628 * Returning an error causes ifenslave to fail. 3629 */ 3630 if (bond->params.fail_over_mac && 3631 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3632 return 0; 3633 3634 if (!is_valid_ether_addr(sa->sa_data)) 3635 return -EADDRNOTAVAIL; 3636 3637 bond_for_each_slave(bond, slave, iter) { 3638 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name); 3639 res = dev_set_mac_address(slave->dev, addr); 3640 if (res) { 3641 /* TODO: consider downing the slave 3642 * and retry ? 3643 * User should expect communications 3644 * breakage anyway until ARP finish 3645 * updating, so... 3646 */ 3647 netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name); 3648 goto unwind; 3649 } 3650 } 3651 3652 /* success */ 3653 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); 3654 return 0; 3655 3656 unwind: 3657 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 3658 tmp_sa.sa_family = bond_dev->type; 3659 3660 /* unwind from head to the slave that failed */ 3661 bond_for_each_slave(bond, rollback_slave, iter) { 3662 int tmp_res; 3663 3664 if (rollback_slave == slave) 3665 break; 3666 3667 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa); 3668 if (tmp_res) { 3669 netdev_dbg(bond_dev, "unwind err %d dev %s\n", 3670 tmp_res, rollback_slave->dev->name); 3671 } 3672 } 3673 3674 return res; 3675 } 3676 3677 /** 3678 * bond_xmit_slave_id - transmit skb through slave with slave_id 3679 * @bond: bonding device that is transmitting 3680 * @skb: buffer to transmit 3681 * @slave_id: slave id up to slave_cnt-1 through which to transmit 3682 * 3683 * This function tries to transmit through slave with slave_id but in case 3684 * it fails, it tries to find the first available slave for transmission. 3685 * The skb is consumed in all cases, thus the function is void. 3686 */ 3687 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id) 3688 { 3689 struct list_head *iter; 3690 struct slave *slave; 3691 int i = slave_id; 3692 3693 /* Here we start from the slave with slave_id */ 3694 bond_for_each_slave_rcu(bond, slave, iter) { 3695 if (--i < 0) { 3696 if (bond_slave_can_tx(slave)) { 3697 bond_dev_queue_xmit(bond, skb, slave->dev); 3698 return; 3699 } 3700 } 3701 } 3702 3703 /* Here we start from the first slave up to slave_id */ 3704 i = slave_id; 3705 bond_for_each_slave_rcu(bond, slave, iter) { 3706 if (--i < 0) 3707 break; 3708 if (bond_slave_can_tx(slave)) { 3709 bond_dev_queue_xmit(bond, skb, slave->dev); 3710 return; 3711 } 3712 } 3713 /* no slave that can tx has been found */ 3714 bond_tx_drop(bond->dev, skb); 3715 } 3716 3717 /** 3718 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave 3719 * @bond: bonding device to use 3720 * 3721 * Based on the value of the bonding device's packets_per_slave parameter 3722 * this function generates a slave id, which is usually used as the next 3723 * slave to transmit through. 3724 */ 3725 static u32 bond_rr_gen_slave_id(struct bonding *bond) 3726 { 3727 u32 slave_id; 3728 struct reciprocal_value reciprocal_packets_per_slave; 3729 int packets_per_slave = bond->params.packets_per_slave; 3730 3731 switch (packets_per_slave) { 3732 case 0: 3733 slave_id = prandom_u32(); 3734 break; 3735 case 1: 3736 slave_id = bond->rr_tx_counter; 3737 break; 3738 default: 3739 reciprocal_packets_per_slave = 3740 bond->params.reciprocal_packets_per_slave; 3741 slave_id = reciprocal_divide(bond->rr_tx_counter, 3742 reciprocal_packets_per_slave); 3743 break; 3744 } 3745 bond->rr_tx_counter++; 3746 3747 return slave_id; 3748 } 3749 3750 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev) 3751 { 3752 struct bonding *bond = netdev_priv(bond_dev); 3753 struct iphdr *iph = ip_hdr(skb); 3754 struct slave *slave; 3755 u32 slave_id; 3756 3757 /* Start with the curr_active_slave that joined the bond as the 3758 * default for sending IGMP traffic. For failover purposes one 3759 * needs to maintain some consistency for the interface that will 3760 * send the join/membership reports. The curr_active_slave found 3761 * will send all of this type of traffic. 3762 */ 3763 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) { 3764 slave = rcu_dereference(bond->curr_active_slave); 3765 if (slave) 3766 bond_dev_queue_xmit(bond, skb, slave->dev); 3767 else 3768 bond_xmit_slave_id(bond, skb, 0); 3769 } else { 3770 int slave_cnt = ACCESS_ONCE(bond->slave_cnt); 3771 3772 if (likely(slave_cnt)) { 3773 slave_id = bond_rr_gen_slave_id(bond); 3774 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt); 3775 } else { 3776 bond_tx_drop(bond_dev, skb); 3777 } 3778 } 3779 3780 return NETDEV_TX_OK; 3781 } 3782 3783 /* In active-backup mode, we know that bond->curr_active_slave is always valid if 3784 * the bond has a usable interface. 3785 */ 3786 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev) 3787 { 3788 struct bonding *bond = netdev_priv(bond_dev); 3789 struct slave *slave; 3790 3791 slave = rcu_dereference(bond->curr_active_slave); 3792 if (slave) 3793 bond_dev_queue_xmit(bond, skb, slave->dev); 3794 else 3795 bond_tx_drop(bond_dev, skb); 3796 3797 return NETDEV_TX_OK; 3798 } 3799 3800 /* Use this to update slave_array when (a) it's not appropriate to update 3801 * slave_array right away (note that update_slave_array() may sleep) 3802 * and / or (b) RTNL is not held. 3803 */ 3804 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay) 3805 { 3806 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay); 3807 } 3808 3809 /* Slave array work handler. Holds only RTNL */ 3810 static void bond_slave_arr_handler(struct work_struct *work) 3811 { 3812 struct bonding *bond = container_of(work, struct bonding, 3813 slave_arr_work.work); 3814 int ret; 3815 3816 if (!rtnl_trylock()) 3817 goto err; 3818 3819 ret = bond_update_slave_arr(bond, NULL); 3820 rtnl_unlock(); 3821 if (ret) { 3822 pr_warn_ratelimited("Failed to update slave array from WT\n"); 3823 goto err; 3824 } 3825 return; 3826 3827 err: 3828 bond_slave_arr_work_rearm(bond, 1); 3829 } 3830 3831 /* Build the usable slaves array in control path for modes that use xmit-hash 3832 * to determine the slave interface - 3833 * (a) BOND_MODE_8023AD 3834 * (b) BOND_MODE_XOR 3835 * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0 3836 * 3837 * The caller is expected to hold RTNL only and NO other lock! 3838 */ 3839 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave) 3840 { 3841 struct slave *slave; 3842 struct list_head *iter; 3843 struct bond_up_slave *new_arr, *old_arr; 3844 int agg_id = 0; 3845 int ret = 0; 3846 3847 #ifdef CONFIG_LOCKDEP 3848 WARN_ON(lockdep_is_held(&bond->mode_lock)); 3849 #endif 3850 3851 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]), 3852 GFP_KERNEL); 3853 if (!new_arr) { 3854 ret = -ENOMEM; 3855 pr_err("Failed to build slave-array.\n"); 3856 goto out; 3857 } 3858 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3859 struct ad_info ad_info; 3860 3861 if (bond_3ad_get_active_agg_info(bond, &ad_info)) { 3862 pr_debug("bond_3ad_get_active_agg_info failed\n"); 3863 kfree_rcu(new_arr, rcu); 3864 /* No active aggragator means it's not safe to use 3865 * the previous array. 3866 */ 3867 old_arr = rtnl_dereference(bond->slave_arr); 3868 if (old_arr) { 3869 RCU_INIT_POINTER(bond->slave_arr, NULL); 3870 kfree_rcu(old_arr, rcu); 3871 } 3872 goto out; 3873 } 3874 agg_id = ad_info.aggregator_id; 3875 } 3876 bond_for_each_slave(bond, slave, iter) { 3877 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3878 struct aggregator *agg; 3879 3880 agg = SLAVE_AD_INFO(slave)->port.aggregator; 3881 if (!agg || agg->aggregator_identifier != agg_id) 3882 continue; 3883 } 3884 if (!bond_slave_can_tx(slave)) 3885 continue; 3886 if (skipslave == slave) 3887 continue; 3888 new_arr->arr[new_arr->count++] = slave; 3889 } 3890 3891 old_arr = rtnl_dereference(bond->slave_arr); 3892 rcu_assign_pointer(bond->slave_arr, new_arr); 3893 if (old_arr) 3894 kfree_rcu(old_arr, rcu); 3895 out: 3896 if (ret != 0 && skipslave) { 3897 int idx; 3898 3899 /* Rare situation where caller has asked to skip a specific 3900 * slave but allocation failed (most likely!). BTW this is 3901 * only possible when the call is initiated from 3902 * __bond_release_one(). In this situation; overwrite the 3903 * skipslave entry in the array with the last entry from the 3904 * array to avoid a situation where the xmit path may choose 3905 * this to-be-skipped slave to send a packet out. 3906 */ 3907 old_arr = rtnl_dereference(bond->slave_arr); 3908 for (idx = 0; idx < old_arr->count; idx++) { 3909 if (skipslave == old_arr->arr[idx]) { 3910 old_arr->arr[idx] = 3911 old_arr->arr[old_arr->count-1]; 3912 old_arr->count--; 3913 break; 3914 } 3915 } 3916 } 3917 return ret; 3918 } 3919 3920 /* Use this Xmit function for 3AD as well as XOR modes. The current 3921 * usable slave array is formed in the control path. The xmit function 3922 * just calculates hash and sends the packet out. 3923 */ 3924 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev) 3925 { 3926 struct bonding *bond = netdev_priv(dev); 3927 struct slave *slave; 3928 struct bond_up_slave *slaves; 3929 unsigned int count; 3930 3931 slaves = rcu_dereference(bond->slave_arr); 3932 count = slaves ? ACCESS_ONCE(slaves->count) : 0; 3933 if (likely(count)) { 3934 slave = slaves->arr[bond_xmit_hash(bond, skb) % count]; 3935 bond_dev_queue_xmit(bond, skb, slave->dev); 3936 } else { 3937 bond_tx_drop(dev, skb); 3938 } 3939 3940 return NETDEV_TX_OK; 3941 } 3942 3943 /* in broadcast mode, we send everything to all usable interfaces. */ 3944 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev) 3945 { 3946 struct bonding *bond = netdev_priv(bond_dev); 3947 struct slave *slave = NULL; 3948 struct list_head *iter; 3949 3950 bond_for_each_slave_rcu(bond, slave, iter) { 3951 if (bond_is_last_slave(bond, slave)) 3952 break; 3953 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 3954 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 3955 3956 if (!skb2) { 3957 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n", 3958 bond_dev->name, __func__); 3959 continue; 3960 } 3961 bond_dev_queue_xmit(bond, skb2, slave->dev); 3962 } 3963 } 3964 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) 3965 bond_dev_queue_xmit(bond, skb, slave->dev); 3966 else 3967 bond_tx_drop(bond_dev, skb); 3968 3969 return NETDEV_TX_OK; 3970 } 3971 3972 /*------------------------- Device initialization ---------------------------*/ 3973 3974 /* Lookup the slave that corresponds to a qid */ 3975 static inline int bond_slave_override(struct bonding *bond, 3976 struct sk_buff *skb) 3977 { 3978 struct slave *slave = NULL; 3979 struct list_head *iter; 3980 3981 if (!skb->queue_mapping) 3982 return 1; 3983 3984 /* Find out if any slaves have the same mapping as this skb. */ 3985 bond_for_each_slave_rcu(bond, slave, iter) { 3986 if (slave->queue_id == skb->queue_mapping) { 3987 if (bond_slave_is_up(slave) && 3988 slave->link == BOND_LINK_UP) { 3989 bond_dev_queue_xmit(bond, skb, slave->dev); 3990 return 0; 3991 } 3992 /* If the slave isn't UP, use default transmit policy. */ 3993 break; 3994 } 3995 } 3996 3997 return 1; 3998 } 3999 4000 4001 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb, 4002 void *accel_priv, select_queue_fallback_t fallback) 4003 { 4004 /* This helper function exists to help dev_pick_tx get the correct 4005 * destination queue. Using a helper function skips a call to 4006 * skb_tx_hash and will put the skbs in the queue we expect on their 4007 * way down to the bonding driver. 4008 */ 4009 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 4010 4011 /* Save the original txq to restore before passing to the driver */ 4012 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping; 4013 4014 if (unlikely(txq >= dev->real_num_tx_queues)) { 4015 do { 4016 txq -= dev->real_num_tx_queues; 4017 } while (txq >= dev->real_num_tx_queues); 4018 } 4019 return txq; 4020 } 4021 4022 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4023 { 4024 struct bonding *bond = netdev_priv(dev); 4025 4026 if (bond_should_override_tx_queue(bond) && 4027 !bond_slave_override(bond, skb)) 4028 return NETDEV_TX_OK; 4029 4030 switch (BOND_MODE(bond)) { 4031 case BOND_MODE_ROUNDROBIN: 4032 return bond_xmit_roundrobin(skb, dev); 4033 case BOND_MODE_ACTIVEBACKUP: 4034 return bond_xmit_activebackup(skb, dev); 4035 case BOND_MODE_8023AD: 4036 case BOND_MODE_XOR: 4037 return bond_3ad_xor_xmit(skb, dev); 4038 case BOND_MODE_BROADCAST: 4039 return bond_xmit_broadcast(skb, dev); 4040 case BOND_MODE_ALB: 4041 return bond_alb_xmit(skb, dev); 4042 case BOND_MODE_TLB: 4043 return bond_tlb_xmit(skb, dev); 4044 default: 4045 /* Should never happen, mode already checked */ 4046 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond)); 4047 WARN_ON_ONCE(1); 4048 bond_tx_drop(dev, skb); 4049 return NETDEV_TX_OK; 4050 } 4051 } 4052 4053 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4054 { 4055 struct bonding *bond = netdev_priv(dev); 4056 netdev_tx_t ret = NETDEV_TX_OK; 4057 4058 /* If we risk deadlock from transmitting this in the 4059 * netpoll path, tell netpoll to queue the frame for later tx 4060 */ 4061 if (unlikely(is_netpoll_tx_blocked(dev))) 4062 return NETDEV_TX_BUSY; 4063 4064 rcu_read_lock(); 4065 if (bond_has_slaves(bond)) 4066 ret = __bond_start_xmit(skb, dev); 4067 else 4068 bond_tx_drop(dev, skb); 4069 rcu_read_unlock(); 4070 4071 return ret; 4072 } 4073 4074 static int bond_ethtool_get_settings(struct net_device *bond_dev, 4075 struct ethtool_cmd *ecmd) 4076 { 4077 struct bonding *bond = netdev_priv(bond_dev); 4078 unsigned long speed = 0; 4079 struct list_head *iter; 4080 struct slave *slave; 4081 4082 ecmd->duplex = DUPLEX_UNKNOWN; 4083 ecmd->port = PORT_OTHER; 4084 4085 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we 4086 * do not need to check mode. Though link speed might not represent 4087 * the true receive or transmit bandwidth (not all modes are symmetric) 4088 * this is an accurate maximum. 4089 */ 4090 bond_for_each_slave(bond, slave, iter) { 4091 if (bond_slave_can_tx(slave)) { 4092 if (slave->speed != SPEED_UNKNOWN) 4093 speed += slave->speed; 4094 if (ecmd->duplex == DUPLEX_UNKNOWN && 4095 slave->duplex != DUPLEX_UNKNOWN) 4096 ecmd->duplex = slave->duplex; 4097 } 4098 } 4099 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN); 4100 4101 return 0; 4102 } 4103 4104 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 4105 struct ethtool_drvinfo *drvinfo) 4106 { 4107 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver)); 4108 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version)); 4109 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d", 4110 BOND_ABI_VERSION); 4111 } 4112 4113 static const struct ethtool_ops bond_ethtool_ops = { 4114 .get_drvinfo = bond_ethtool_get_drvinfo, 4115 .get_settings = bond_ethtool_get_settings, 4116 .get_link = ethtool_op_get_link, 4117 }; 4118 4119 static const struct net_device_ops bond_netdev_ops = { 4120 .ndo_init = bond_init, 4121 .ndo_uninit = bond_uninit, 4122 .ndo_open = bond_open, 4123 .ndo_stop = bond_close, 4124 .ndo_start_xmit = bond_start_xmit, 4125 .ndo_select_queue = bond_select_queue, 4126 .ndo_get_stats64 = bond_get_stats, 4127 .ndo_do_ioctl = bond_do_ioctl, 4128 .ndo_change_rx_flags = bond_change_rx_flags, 4129 .ndo_set_rx_mode = bond_set_rx_mode, 4130 .ndo_change_mtu = bond_change_mtu, 4131 .ndo_set_mac_address = bond_set_mac_address, 4132 .ndo_neigh_setup = bond_neigh_setup, 4133 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 4134 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 4135 #ifdef CONFIG_NET_POLL_CONTROLLER 4136 .ndo_netpoll_setup = bond_netpoll_setup, 4137 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 4138 .ndo_poll_controller = bond_poll_controller, 4139 #endif 4140 .ndo_add_slave = bond_enslave, 4141 .ndo_del_slave = bond_release, 4142 .ndo_fix_features = bond_fix_features, 4143 .ndo_bridge_setlink = switchdev_port_bridge_setlink, 4144 .ndo_bridge_getlink = switchdev_port_bridge_getlink, 4145 .ndo_bridge_dellink = switchdev_port_bridge_dellink, 4146 .ndo_fdb_add = switchdev_port_fdb_add, 4147 .ndo_fdb_del = switchdev_port_fdb_del, 4148 .ndo_fdb_dump = switchdev_port_fdb_dump, 4149 .ndo_features_check = passthru_features_check, 4150 }; 4151 4152 static const struct device_type bond_type = { 4153 .name = "bond", 4154 }; 4155 4156 static void bond_destructor(struct net_device *bond_dev) 4157 { 4158 struct bonding *bond = netdev_priv(bond_dev); 4159 if (bond->wq) 4160 destroy_workqueue(bond->wq); 4161 free_netdev(bond_dev); 4162 } 4163 4164 void bond_setup(struct net_device *bond_dev) 4165 { 4166 struct bonding *bond = netdev_priv(bond_dev); 4167 4168 spin_lock_init(&bond->mode_lock); 4169 bond->params = bonding_defaults; 4170 4171 /* Initialize pointers */ 4172 bond->dev = bond_dev; 4173 4174 /* Initialize the device entry points */ 4175 ether_setup(bond_dev); 4176 bond_dev->netdev_ops = &bond_netdev_ops; 4177 bond_dev->ethtool_ops = &bond_ethtool_ops; 4178 4179 bond_dev->destructor = bond_destructor; 4180 4181 SET_NETDEV_DEVTYPE(bond_dev, &bond_type); 4182 4183 /* Initialize the device options */ 4184 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST; 4185 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE; 4186 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 4187 4188 /* don't acquire bond device's netif_tx_lock when transmitting */ 4189 bond_dev->features |= NETIF_F_LLTX; 4190 4191 /* By default, we declare the bond to be fully 4192 * VLAN hardware accelerated capable. Special 4193 * care is taken in the various xmit functions 4194 * when there are slaves that are not hw accel 4195 * capable 4196 */ 4197 4198 /* Don't allow bond devices to change network namespaces. */ 4199 bond_dev->features |= NETIF_F_NETNS_LOCAL; 4200 4201 bond_dev->hw_features = BOND_VLAN_FEATURES | 4202 NETIF_F_HW_VLAN_CTAG_TX | 4203 NETIF_F_HW_VLAN_CTAG_RX | 4204 NETIF_F_HW_VLAN_CTAG_FILTER; 4205 4206 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL; 4207 bond_dev->features |= bond_dev->hw_features; 4208 } 4209 4210 /* Destroy a bonding device. 4211 * Must be under rtnl_lock when this function is called. 4212 */ 4213 static void bond_uninit(struct net_device *bond_dev) 4214 { 4215 struct bonding *bond = netdev_priv(bond_dev); 4216 struct list_head *iter; 4217 struct slave *slave; 4218 struct bond_up_slave *arr; 4219 4220 bond_netpoll_cleanup(bond_dev); 4221 4222 /* Release the bonded slaves */ 4223 bond_for_each_slave(bond, slave, iter) 4224 __bond_release_one(bond_dev, slave->dev, true); 4225 netdev_info(bond_dev, "Released all slaves\n"); 4226 4227 arr = rtnl_dereference(bond->slave_arr); 4228 if (arr) { 4229 RCU_INIT_POINTER(bond->slave_arr, NULL); 4230 kfree_rcu(arr, rcu); 4231 } 4232 4233 list_del(&bond->bond_list); 4234 4235 bond_debug_unregister(bond); 4236 } 4237 4238 /*------------------------- Module initialization ---------------------------*/ 4239 4240 static int bond_check_params(struct bond_params *params) 4241 { 4242 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i; 4243 struct bond_opt_value newval; 4244 const struct bond_opt_value *valptr; 4245 int arp_all_targets_value; 4246 u16 ad_actor_sys_prio = 0; 4247 u16 ad_user_port_key = 0; 4248 4249 /* Convert string parameters. */ 4250 if (mode) { 4251 bond_opt_initstr(&newval, mode); 4252 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval); 4253 if (!valptr) { 4254 pr_err("Error: Invalid bonding mode \"%s\"\n", mode); 4255 return -EINVAL; 4256 } 4257 bond_mode = valptr->value; 4258 } 4259 4260 if (xmit_hash_policy) { 4261 if ((bond_mode != BOND_MODE_XOR) && 4262 (bond_mode != BOND_MODE_8023AD) && 4263 (bond_mode != BOND_MODE_TLB)) { 4264 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 4265 bond_mode_name(bond_mode)); 4266 } else { 4267 bond_opt_initstr(&newval, xmit_hash_policy); 4268 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH), 4269 &newval); 4270 if (!valptr) { 4271 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 4272 xmit_hash_policy); 4273 return -EINVAL; 4274 } 4275 xmit_hashtype = valptr->value; 4276 } 4277 } 4278 4279 if (lacp_rate) { 4280 if (bond_mode != BOND_MODE_8023AD) { 4281 pr_info("lacp_rate param is irrelevant in mode %s\n", 4282 bond_mode_name(bond_mode)); 4283 } else { 4284 bond_opt_initstr(&newval, lacp_rate); 4285 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE), 4286 &newval); 4287 if (!valptr) { 4288 pr_err("Error: Invalid lacp rate \"%s\"\n", 4289 lacp_rate); 4290 return -EINVAL; 4291 } 4292 lacp_fast = valptr->value; 4293 } 4294 } 4295 4296 if (ad_select) { 4297 bond_opt_initstr(&newval, ad_select); 4298 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT), 4299 &newval); 4300 if (!valptr) { 4301 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select); 4302 return -EINVAL; 4303 } 4304 params->ad_select = valptr->value; 4305 if (bond_mode != BOND_MODE_8023AD) 4306 pr_warn("ad_select param only affects 802.3ad mode\n"); 4307 } else { 4308 params->ad_select = BOND_AD_STABLE; 4309 } 4310 4311 if (max_bonds < 0) { 4312 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 4313 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 4314 max_bonds = BOND_DEFAULT_MAX_BONDS; 4315 } 4316 4317 if (miimon < 0) { 4318 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4319 miimon, INT_MAX); 4320 miimon = 0; 4321 } 4322 4323 if (updelay < 0) { 4324 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4325 updelay, INT_MAX); 4326 updelay = 0; 4327 } 4328 4329 if (downdelay < 0) { 4330 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4331 downdelay, INT_MAX); 4332 downdelay = 0; 4333 } 4334 4335 if ((use_carrier != 0) && (use_carrier != 1)) { 4336 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 4337 use_carrier); 4338 use_carrier = 1; 4339 } 4340 4341 if (num_peer_notif < 0 || num_peer_notif > 255) { 4342 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 4343 num_peer_notif); 4344 num_peer_notif = 1; 4345 } 4346 4347 /* reset values for 802.3ad/TLB/ALB */ 4348 if (!bond_mode_uses_arp(bond_mode)) { 4349 if (!miimon) { 4350 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"); 4351 pr_warn("Forcing miimon to 100msec\n"); 4352 miimon = BOND_DEFAULT_MIIMON; 4353 } 4354 } 4355 4356 if (tx_queues < 1 || tx_queues > 255) { 4357 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n", 4358 tx_queues, BOND_DEFAULT_TX_QUEUES); 4359 tx_queues = BOND_DEFAULT_TX_QUEUES; 4360 } 4361 4362 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 4363 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n", 4364 all_slaves_active); 4365 all_slaves_active = 0; 4366 } 4367 4368 if (resend_igmp < 0 || resend_igmp > 255) { 4369 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n", 4370 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 4371 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 4372 } 4373 4374 bond_opt_initval(&newval, packets_per_slave); 4375 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) { 4376 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n", 4377 packets_per_slave, USHRT_MAX); 4378 packets_per_slave = 1; 4379 } 4380 4381 if (bond_mode == BOND_MODE_ALB) { 4382 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", 4383 updelay); 4384 } 4385 4386 if (!miimon) { 4387 if (updelay || downdelay) { 4388 /* just warn the user the up/down delay will have 4389 * no effect since miimon is zero... 4390 */ 4391 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", 4392 updelay, downdelay); 4393 } 4394 } else { 4395 /* don't allow arp monitoring */ 4396 if (arp_interval) { 4397 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 4398 miimon, arp_interval); 4399 arp_interval = 0; 4400 } 4401 4402 if ((updelay % miimon) != 0) { 4403 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 4404 updelay, miimon, (updelay / miimon) * miimon); 4405 } 4406 4407 updelay /= miimon; 4408 4409 if ((downdelay % miimon) != 0) { 4410 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 4411 downdelay, miimon, 4412 (downdelay / miimon) * miimon); 4413 } 4414 4415 downdelay /= miimon; 4416 } 4417 4418 if (arp_interval < 0) { 4419 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4420 arp_interval, INT_MAX); 4421 arp_interval = 0; 4422 } 4423 4424 for (arp_ip_count = 0, i = 0; 4425 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) { 4426 __be32 ip; 4427 4428 /* not a complete check, but good enough to catch mistakes */ 4429 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) || 4430 !bond_is_ip_target_ok(ip)) { 4431 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 4432 arp_ip_target[i]); 4433 arp_interval = 0; 4434 } else { 4435 if (bond_get_targets_ip(arp_target, ip) == -1) 4436 arp_target[arp_ip_count++] = ip; 4437 else 4438 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n", 4439 &ip); 4440 } 4441 } 4442 4443 if (arp_interval && !arp_ip_count) { 4444 /* don't allow arping if no arp_ip_target given... */ 4445 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 4446 arp_interval); 4447 arp_interval = 0; 4448 } 4449 4450 if (arp_validate) { 4451 if (!arp_interval) { 4452 pr_err("arp_validate requires arp_interval\n"); 4453 return -EINVAL; 4454 } 4455 4456 bond_opt_initstr(&newval, arp_validate); 4457 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE), 4458 &newval); 4459 if (!valptr) { 4460 pr_err("Error: invalid arp_validate \"%s\"\n", 4461 arp_validate); 4462 return -EINVAL; 4463 } 4464 arp_validate_value = valptr->value; 4465 } else { 4466 arp_validate_value = 0; 4467 } 4468 4469 arp_all_targets_value = 0; 4470 if (arp_all_targets) { 4471 bond_opt_initstr(&newval, arp_all_targets); 4472 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS), 4473 &newval); 4474 if (!valptr) { 4475 pr_err("Error: invalid arp_all_targets_value \"%s\"\n", 4476 arp_all_targets); 4477 arp_all_targets_value = 0; 4478 } else { 4479 arp_all_targets_value = valptr->value; 4480 } 4481 } 4482 4483 if (miimon) { 4484 pr_info("MII link monitoring set to %d ms\n", miimon); 4485 } else if (arp_interval) { 4486 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE, 4487 arp_validate_value); 4488 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 4489 arp_interval, valptr->string, arp_ip_count); 4490 4491 for (i = 0; i < arp_ip_count; i++) 4492 pr_cont(" %s", arp_ip_target[i]); 4493 4494 pr_cont("\n"); 4495 4496 } else if (max_bonds) { 4497 /* miimon and arp_interval not set, we need one so things 4498 * work as expected, see bonding.txt for details 4499 */ 4500 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"); 4501 } 4502 4503 if (primary && !bond_mode_uses_primary(bond_mode)) { 4504 /* currently, using a primary only makes sense 4505 * in active backup, TLB or ALB modes 4506 */ 4507 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n", 4508 primary, bond_mode_name(bond_mode)); 4509 primary = NULL; 4510 } 4511 4512 if (primary && primary_reselect) { 4513 bond_opt_initstr(&newval, primary_reselect); 4514 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT), 4515 &newval); 4516 if (!valptr) { 4517 pr_err("Error: Invalid primary_reselect \"%s\"\n", 4518 primary_reselect); 4519 return -EINVAL; 4520 } 4521 primary_reselect_value = valptr->value; 4522 } else { 4523 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 4524 } 4525 4526 if (fail_over_mac) { 4527 bond_opt_initstr(&newval, fail_over_mac); 4528 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC), 4529 &newval); 4530 if (!valptr) { 4531 pr_err("Error: invalid fail_over_mac \"%s\"\n", 4532 fail_over_mac); 4533 return -EINVAL; 4534 } 4535 fail_over_mac_value = valptr->value; 4536 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 4537 pr_warn("Warning: fail_over_mac only affects active-backup mode\n"); 4538 } else { 4539 fail_over_mac_value = BOND_FOM_NONE; 4540 } 4541 4542 bond_opt_initstr(&newval, "default"); 4543 valptr = bond_opt_parse( 4544 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO), 4545 &newval); 4546 if (!valptr) { 4547 pr_err("Error: No ad_actor_sys_prio default value"); 4548 return -EINVAL; 4549 } 4550 ad_actor_sys_prio = valptr->value; 4551 4552 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY), 4553 &newval); 4554 if (!valptr) { 4555 pr_err("Error: No ad_user_port_key default value"); 4556 return -EINVAL; 4557 } 4558 ad_user_port_key = valptr->value; 4559 4560 if (lp_interval == 0) { 4561 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n", 4562 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL); 4563 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 4564 } 4565 4566 /* fill params struct with the proper values */ 4567 params->mode = bond_mode; 4568 params->xmit_policy = xmit_hashtype; 4569 params->miimon = miimon; 4570 params->num_peer_notif = num_peer_notif; 4571 params->arp_interval = arp_interval; 4572 params->arp_validate = arp_validate_value; 4573 params->arp_all_targets = arp_all_targets_value; 4574 params->updelay = updelay; 4575 params->downdelay = downdelay; 4576 params->use_carrier = use_carrier; 4577 params->lacp_fast = lacp_fast; 4578 params->primary[0] = 0; 4579 params->primary_reselect = primary_reselect_value; 4580 params->fail_over_mac = fail_over_mac_value; 4581 params->tx_queues = tx_queues; 4582 params->all_slaves_active = all_slaves_active; 4583 params->resend_igmp = resend_igmp; 4584 params->min_links = min_links; 4585 params->lp_interval = lp_interval; 4586 params->packets_per_slave = packets_per_slave; 4587 params->tlb_dynamic_lb = 1; /* Default value */ 4588 params->ad_actor_sys_prio = ad_actor_sys_prio; 4589 eth_zero_addr(params->ad_actor_system); 4590 params->ad_user_port_key = ad_user_port_key; 4591 if (packets_per_slave > 0) { 4592 params->reciprocal_packets_per_slave = 4593 reciprocal_value(packets_per_slave); 4594 } else { 4595 /* reciprocal_packets_per_slave is unused if 4596 * packets_per_slave is 0 or 1, just initialize it 4597 */ 4598 params->reciprocal_packets_per_slave = 4599 (struct reciprocal_value) { 0 }; 4600 } 4601 4602 if (primary) { 4603 strncpy(params->primary, primary, IFNAMSIZ); 4604 params->primary[IFNAMSIZ - 1] = 0; 4605 } 4606 4607 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 4608 4609 return 0; 4610 } 4611 4612 static struct lock_class_key bonding_netdev_xmit_lock_key; 4613 static struct lock_class_key bonding_netdev_addr_lock_key; 4614 static struct lock_class_key bonding_tx_busylock_key; 4615 4616 static void bond_set_lockdep_class_one(struct net_device *dev, 4617 struct netdev_queue *txq, 4618 void *_unused) 4619 { 4620 lockdep_set_class(&txq->_xmit_lock, 4621 &bonding_netdev_xmit_lock_key); 4622 } 4623 4624 static void bond_set_lockdep_class(struct net_device *dev) 4625 { 4626 lockdep_set_class(&dev->addr_list_lock, 4627 &bonding_netdev_addr_lock_key); 4628 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL); 4629 dev->qdisc_tx_busylock = &bonding_tx_busylock_key; 4630 } 4631 4632 /* Called from registration process */ 4633 static int bond_init(struct net_device *bond_dev) 4634 { 4635 struct bonding *bond = netdev_priv(bond_dev); 4636 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 4637 4638 netdev_dbg(bond_dev, "Begin bond_init\n"); 4639 4640 bond->wq = create_singlethread_workqueue(bond_dev->name); 4641 if (!bond->wq) 4642 return -ENOMEM; 4643 4644 bond_set_lockdep_class(bond_dev); 4645 4646 list_add_tail(&bond->bond_list, &bn->dev_list); 4647 4648 bond_prepare_sysfs_group(bond); 4649 4650 bond_debug_register(bond); 4651 4652 /* Ensure valid dev_addr */ 4653 if (is_zero_ether_addr(bond_dev->dev_addr) && 4654 bond_dev->addr_assign_type == NET_ADDR_PERM) 4655 eth_hw_addr_random(bond_dev); 4656 4657 return 0; 4658 } 4659 4660 unsigned int bond_get_num_tx_queues(void) 4661 { 4662 return tx_queues; 4663 } 4664 4665 /* Create a new bond based on the specified name and bonding parameters. 4666 * If name is NULL, obtain a suitable "bond%d" name for us. 4667 * Caller must NOT hold rtnl_lock; we need to release it here before we 4668 * set up our sysfs entries. 4669 */ 4670 int bond_create(struct net *net, const char *name) 4671 { 4672 struct net_device *bond_dev; 4673 struct bonding *bond; 4674 struct alb_bond_info *bond_info; 4675 int res; 4676 4677 rtnl_lock(); 4678 4679 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 4680 name ? name : "bond%d", NET_NAME_UNKNOWN, 4681 bond_setup, tx_queues); 4682 if (!bond_dev) { 4683 pr_err("%s: eek! can't alloc netdev!\n", name); 4684 rtnl_unlock(); 4685 return -ENOMEM; 4686 } 4687 4688 /* 4689 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX. 4690 * It is set to 0 by default which is wrong. 4691 */ 4692 bond = netdev_priv(bond_dev); 4693 bond_info = &(BOND_ALB_INFO(bond)); 4694 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; 4695 4696 dev_net_set(bond_dev, net); 4697 bond_dev->rtnl_link_ops = &bond_link_ops; 4698 4699 res = register_netdevice(bond_dev); 4700 4701 netif_carrier_off(bond_dev); 4702 4703 rtnl_unlock(); 4704 if (res < 0) 4705 bond_destructor(bond_dev); 4706 return res; 4707 } 4708 4709 static int __net_init bond_net_init(struct net *net) 4710 { 4711 struct bond_net *bn = net_generic(net, bond_net_id); 4712 4713 bn->net = net; 4714 INIT_LIST_HEAD(&bn->dev_list); 4715 4716 bond_create_proc_dir(bn); 4717 bond_create_sysfs(bn); 4718 4719 return 0; 4720 } 4721 4722 static void __net_exit bond_net_exit(struct net *net) 4723 { 4724 struct bond_net *bn = net_generic(net, bond_net_id); 4725 struct bonding *bond, *tmp_bond; 4726 LIST_HEAD(list); 4727 4728 bond_destroy_sysfs(bn); 4729 4730 /* Kill off any bonds created after unregistering bond rtnl ops */ 4731 rtnl_lock(); 4732 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list) 4733 unregister_netdevice_queue(bond->dev, &list); 4734 unregister_netdevice_many(&list); 4735 rtnl_unlock(); 4736 4737 bond_destroy_proc_dir(bn); 4738 } 4739 4740 static struct pernet_operations bond_net_ops = { 4741 .init = bond_net_init, 4742 .exit = bond_net_exit, 4743 .id = &bond_net_id, 4744 .size = sizeof(struct bond_net), 4745 }; 4746 4747 static int __init bonding_init(void) 4748 { 4749 int i; 4750 int res; 4751 4752 pr_info("%s", bond_version); 4753 4754 res = bond_check_params(&bonding_defaults); 4755 if (res) 4756 goto out; 4757 4758 res = register_pernet_subsys(&bond_net_ops); 4759 if (res) 4760 goto out; 4761 4762 res = bond_netlink_init(); 4763 if (res) 4764 goto err_link; 4765 4766 bond_create_debugfs(); 4767 4768 for (i = 0; i < max_bonds; i++) { 4769 res = bond_create(&init_net, NULL); 4770 if (res) 4771 goto err; 4772 } 4773 4774 register_netdevice_notifier(&bond_netdev_notifier); 4775 out: 4776 return res; 4777 err: 4778 bond_destroy_debugfs(); 4779 bond_netlink_fini(); 4780 err_link: 4781 unregister_pernet_subsys(&bond_net_ops); 4782 goto out; 4783 4784 } 4785 4786 static void __exit bonding_exit(void) 4787 { 4788 unregister_netdevice_notifier(&bond_netdev_notifier); 4789 4790 bond_destroy_debugfs(); 4791 4792 bond_netlink_fini(); 4793 unregister_pernet_subsys(&bond_net_ops); 4794 4795 #ifdef CONFIG_NET_POLL_CONTROLLER 4796 /* Make sure we don't have an imbalance on our netpoll blocking */ 4797 WARN_ON(atomic_read(&netpoll_block_tx)); 4798 #endif 4799 } 4800 4801 module_init(bonding_init); 4802 module_exit(bonding_exit); 4803 MODULE_LICENSE("GPL"); 4804 MODULE_VERSION(DRV_VERSION); 4805 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION); 4806 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 4807