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); 217 218 /*---------------------------- General routines -----------------------------*/ 219 220 const char *bond_mode_name(int mode) 221 { 222 static const char *names[] = { 223 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)", 224 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)", 225 [BOND_MODE_XOR] = "load balancing (xor)", 226 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)", 227 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation", 228 [BOND_MODE_TLB] = "transmit load balancing", 229 [BOND_MODE_ALB] = "adaptive load balancing", 230 }; 231 232 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB) 233 return "unknown"; 234 235 return names[mode]; 236 } 237 238 /*---------------------------------- VLAN -----------------------------------*/ 239 240 /** 241 * bond_dev_queue_xmit - Prepare skb for xmit. 242 * 243 * @bond: bond device that got this skb for tx. 244 * @skb: hw accel VLAN tagged skb to transmit 245 * @slave_dev: slave that is supposed to xmit this skbuff 246 */ 247 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, 248 struct net_device *slave_dev) 249 { 250 skb->dev = slave_dev; 251 252 BUILD_BUG_ON(sizeof(skb->queue_mapping) != 253 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping)); 254 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping; 255 256 if (unlikely(netpoll_tx_running(bond->dev))) 257 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb); 258 else 259 dev_queue_xmit(skb); 260 } 261 262 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid, 263 * We don't protect the slave list iteration with a lock because: 264 * a. This operation is performed in IOCTL context, 265 * b. The operation is protected by the RTNL semaphore in the 8021q code, 266 * c. Holding a lock with BH disabled while directly calling a base driver 267 * entry point is generally a BAD idea. 268 * 269 * The design of synchronization/protection for this operation in the 8021q 270 * module is good for one or more VLAN devices over a single physical device 271 * and cannot be extended for a teaming solution like bonding, so there is a 272 * potential race condition here where a net device from the vlan group might 273 * be referenced (either by a base driver or the 8021q code) while it is being 274 * removed from the system. However, it turns out we're not making matters 275 * worse, and if it works for regular VLAN usage it will work here too. 276 */ 277 278 /** 279 * bond_vlan_rx_add_vid - Propagates adding an id to slaves 280 * @bond_dev: bonding net device that got called 281 * @vid: vlan id being added 282 */ 283 static int bond_vlan_rx_add_vid(struct net_device *bond_dev, 284 __be16 proto, u16 vid) 285 { 286 struct bonding *bond = netdev_priv(bond_dev); 287 struct slave *slave, *rollback_slave; 288 struct list_head *iter; 289 int res; 290 291 bond_for_each_slave(bond, slave, iter) { 292 res = vlan_vid_add(slave->dev, proto, vid); 293 if (res) 294 goto unwind; 295 } 296 297 return 0; 298 299 unwind: 300 /* unwind to the slave that failed */ 301 bond_for_each_slave(bond, rollback_slave, iter) { 302 if (rollback_slave == slave) 303 break; 304 305 vlan_vid_del(rollback_slave->dev, proto, vid); 306 } 307 308 return res; 309 } 310 311 /** 312 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves 313 * @bond_dev: bonding net device that got called 314 * @vid: vlan id being removed 315 */ 316 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, 317 __be16 proto, u16 vid) 318 { 319 struct bonding *bond = netdev_priv(bond_dev); 320 struct list_head *iter; 321 struct slave *slave; 322 323 bond_for_each_slave(bond, slave, iter) 324 vlan_vid_del(slave->dev, proto, vid); 325 326 if (bond_is_lb(bond)) 327 bond_alb_clear_vlan(bond, vid); 328 329 return 0; 330 } 331 332 /*------------------------------- Link status -------------------------------*/ 333 334 /* Set the carrier state for the master according to the state of its 335 * slaves. If any slaves are up, the master is up. In 802.3ad mode, 336 * do special 802.3ad magic. 337 * 338 * Returns zero if carrier state does not change, nonzero if it does. 339 */ 340 int bond_set_carrier(struct bonding *bond) 341 { 342 struct list_head *iter; 343 struct slave *slave; 344 345 if (!bond_has_slaves(bond)) 346 goto down; 347 348 if (BOND_MODE(bond) == BOND_MODE_8023AD) 349 return bond_3ad_set_carrier(bond); 350 351 bond_for_each_slave(bond, slave, iter) { 352 if (slave->link == BOND_LINK_UP) { 353 if (!netif_carrier_ok(bond->dev)) { 354 netif_carrier_on(bond->dev); 355 return 1; 356 } 357 return 0; 358 } 359 } 360 361 down: 362 if (netif_carrier_ok(bond->dev)) { 363 netif_carrier_off(bond->dev); 364 return 1; 365 } 366 return 0; 367 } 368 369 /* Get link speed and duplex from the slave's base driver 370 * using ethtool. If for some reason the call fails or the 371 * values are invalid, set speed and duplex to -1, 372 * and return. 373 */ 374 static void bond_update_speed_duplex(struct slave *slave) 375 { 376 struct net_device *slave_dev = slave->dev; 377 struct ethtool_cmd ecmd; 378 u32 slave_speed; 379 int res; 380 381 slave->speed = SPEED_UNKNOWN; 382 slave->duplex = DUPLEX_UNKNOWN; 383 384 res = __ethtool_get_settings(slave_dev, &ecmd); 385 if (res < 0) 386 return; 387 388 slave_speed = ethtool_cmd_speed(&ecmd); 389 if (slave_speed == 0 || slave_speed == ((__u32) -1)) 390 return; 391 392 switch (ecmd.duplex) { 393 case DUPLEX_FULL: 394 case DUPLEX_HALF: 395 break; 396 default: 397 return; 398 } 399 400 slave->speed = slave_speed; 401 slave->duplex = ecmd.duplex; 402 403 return; 404 } 405 406 const char *bond_slave_link_status(s8 link) 407 { 408 switch (link) { 409 case BOND_LINK_UP: 410 return "up"; 411 case BOND_LINK_FAIL: 412 return "going down"; 413 case BOND_LINK_DOWN: 414 return "down"; 415 case BOND_LINK_BACK: 416 return "going back"; 417 default: 418 return "unknown"; 419 } 420 } 421 422 /* if <dev> supports MII link status reporting, check its link status. 423 * 424 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), 425 * depending upon the setting of the use_carrier parameter. 426 * 427 * Return either BMSR_LSTATUS, meaning that the link is up (or we 428 * can't tell and just pretend it is), or 0, meaning that the link is 429 * down. 430 * 431 * If reporting is non-zero, instead of faking link up, return -1 if 432 * both ETHTOOL and MII ioctls fail (meaning the device does not 433 * support them). If use_carrier is set, return whatever it says. 434 * It'd be nice if there was a good way to tell if a driver supports 435 * netif_carrier, but there really isn't. 436 */ 437 static int bond_check_dev_link(struct bonding *bond, 438 struct net_device *slave_dev, int reporting) 439 { 440 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 441 int (*ioctl)(struct net_device *, struct ifreq *, int); 442 struct ifreq ifr; 443 struct mii_ioctl_data *mii; 444 445 if (!reporting && !netif_running(slave_dev)) 446 return 0; 447 448 if (bond->params.use_carrier) 449 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; 450 451 /* Try to get link status using Ethtool first. */ 452 if (slave_dev->ethtool_ops->get_link) 453 return slave_dev->ethtool_ops->get_link(slave_dev) ? 454 BMSR_LSTATUS : 0; 455 456 /* Ethtool can't be used, fallback to MII ioctls. */ 457 ioctl = slave_ops->ndo_do_ioctl; 458 if (ioctl) { 459 /* TODO: set pointer to correct ioctl on a per team member 460 * bases to make this more efficient. that is, once 461 * we determine the correct ioctl, we will always 462 * call it and not the others for that team 463 * member. 464 */ 465 466 /* We cannot assume that SIOCGMIIPHY will also read a 467 * register; not all network drivers (e.g., e100) 468 * support that. 469 */ 470 471 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ 472 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ); 473 mii = if_mii(&ifr); 474 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) { 475 mii->reg_num = MII_BMSR; 476 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) 477 return mii->val_out & BMSR_LSTATUS; 478 } 479 } 480 481 /* If reporting, report that either there's no dev->do_ioctl, 482 * or both SIOCGMIIREG and get_link failed (meaning that we 483 * cannot report link status). If not reporting, pretend 484 * we're ok. 485 */ 486 return reporting ? -1 : BMSR_LSTATUS; 487 } 488 489 /*----------------------------- Multicast list ------------------------------*/ 490 491 /* Push the promiscuity flag down to appropriate slaves */ 492 static int bond_set_promiscuity(struct bonding *bond, int inc) 493 { 494 struct list_head *iter; 495 int err = 0; 496 497 if (bond_uses_primary(bond)) { 498 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 499 500 if (curr_active) 501 err = dev_set_promiscuity(curr_active->dev, inc); 502 } else { 503 struct slave *slave; 504 505 bond_for_each_slave(bond, slave, iter) { 506 err = dev_set_promiscuity(slave->dev, inc); 507 if (err) 508 return err; 509 } 510 } 511 return err; 512 } 513 514 /* Push the allmulti flag down to all slaves */ 515 static int bond_set_allmulti(struct bonding *bond, int inc) 516 { 517 struct list_head *iter; 518 int err = 0; 519 520 if (bond_uses_primary(bond)) { 521 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 522 523 if (curr_active) 524 err = dev_set_allmulti(curr_active->dev, inc); 525 } else { 526 struct slave *slave; 527 528 bond_for_each_slave(bond, slave, iter) { 529 err = dev_set_allmulti(slave->dev, inc); 530 if (err) 531 return err; 532 } 533 } 534 return err; 535 } 536 537 /* Retrieve the list of registered multicast addresses for the bonding 538 * device and retransmit an IGMP JOIN request to the current active 539 * slave. 540 */ 541 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work) 542 { 543 struct bonding *bond = container_of(work, struct bonding, 544 mcast_work.work); 545 546 if (!rtnl_trylock()) { 547 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 548 return; 549 } 550 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev); 551 552 if (bond->igmp_retrans > 1) { 553 bond->igmp_retrans--; 554 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); 555 } 556 rtnl_unlock(); 557 } 558 559 /* Flush bond's hardware addresses from slave */ 560 static void bond_hw_addr_flush(struct net_device *bond_dev, 561 struct net_device *slave_dev) 562 { 563 struct bonding *bond = netdev_priv(bond_dev); 564 565 dev_uc_unsync(slave_dev, bond_dev); 566 dev_mc_unsync(slave_dev, bond_dev); 567 568 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 569 /* del lacpdu mc addr from mc list */ 570 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 571 572 dev_mc_del(slave_dev, lacpdu_multicast); 573 } 574 } 575 576 /*--------------------------- Active slave change ---------------------------*/ 577 578 /* Update the hardware address list and promisc/allmulti for the new and 579 * old active slaves (if any). Modes that are not using primary keep all 580 * slaves up date at all times; only the modes that use primary need to call 581 * this function to swap these settings during a failover. 582 */ 583 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active, 584 struct slave *old_active) 585 { 586 if (old_active) { 587 if (bond->dev->flags & IFF_PROMISC) 588 dev_set_promiscuity(old_active->dev, -1); 589 590 if (bond->dev->flags & IFF_ALLMULTI) 591 dev_set_allmulti(old_active->dev, -1); 592 593 bond_hw_addr_flush(bond->dev, old_active->dev); 594 } 595 596 if (new_active) { 597 /* FIXME: Signal errors upstream. */ 598 if (bond->dev->flags & IFF_PROMISC) 599 dev_set_promiscuity(new_active->dev, 1); 600 601 if (bond->dev->flags & IFF_ALLMULTI) 602 dev_set_allmulti(new_active->dev, 1); 603 604 netif_addr_lock_bh(bond->dev); 605 dev_uc_sync(new_active->dev, bond->dev); 606 dev_mc_sync(new_active->dev, bond->dev); 607 netif_addr_unlock_bh(bond->dev); 608 } 609 } 610 611 /** 612 * bond_set_dev_addr - clone slave's address to bond 613 * @bond_dev: bond net device 614 * @slave_dev: slave net device 615 * 616 * Should be called with RTNL held. 617 */ 618 static void bond_set_dev_addr(struct net_device *bond_dev, 619 struct net_device *slave_dev) 620 { 621 netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n", 622 bond_dev, slave_dev, slave_dev->addr_len); 623 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len); 624 bond_dev->addr_assign_type = NET_ADDR_STOLEN; 625 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev); 626 } 627 628 static struct slave *bond_get_old_active(struct bonding *bond, 629 struct slave *new_active) 630 { 631 struct slave *slave; 632 struct list_head *iter; 633 634 bond_for_each_slave(bond, slave, iter) { 635 if (slave == new_active) 636 continue; 637 638 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr)) 639 return slave; 640 } 641 642 return NULL; 643 } 644 645 /* bond_do_fail_over_mac 646 * 647 * Perform special MAC address swapping for fail_over_mac settings 648 * 649 * Called with RTNL 650 */ 651 static void bond_do_fail_over_mac(struct bonding *bond, 652 struct slave *new_active, 653 struct slave *old_active) 654 { 655 u8 tmp_mac[ETH_ALEN]; 656 struct sockaddr saddr; 657 int rv; 658 659 switch (bond->params.fail_over_mac) { 660 case BOND_FOM_ACTIVE: 661 if (new_active) 662 bond_set_dev_addr(bond->dev, new_active->dev); 663 break; 664 case BOND_FOM_FOLLOW: 665 /* if new_active && old_active, swap them 666 * if just old_active, do nothing (going to no active slave) 667 * if just new_active, set new_active to bond's MAC 668 */ 669 if (!new_active) 670 return; 671 672 if (!old_active) 673 old_active = bond_get_old_active(bond, new_active); 674 675 if (old_active) { 676 ether_addr_copy(tmp_mac, new_active->dev->dev_addr); 677 ether_addr_copy(saddr.sa_data, 678 old_active->dev->dev_addr); 679 saddr.sa_family = new_active->dev->type; 680 } else { 681 ether_addr_copy(saddr.sa_data, bond->dev->dev_addr); 682 saddr.sa_family = bond->dev->type; 683 } 684 685 rv = dev_set_mac_address(new_active->dev, &saddr); 686 if (rv) { 687 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n", 688 -rv, new_active->dev->name); 689 goto out; 690 } 691 692 if (!old_active) 693 goto out; 694 695 ether_addr_copy(saddr.sa_data, tmp_mac); 696 saddr.sa_family = old_active->dev->type; 697 698 rv = dev_set_mac_address(old_active->dev, &saddr); 699 if (rv) 700 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n", 701 -rv, new_active->dev->name); 702 out: 703 break; 704 default: 705 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n", 706 bond->params.fail_over_mac); 707 break; 708 } 709 710 } 711 712 static struct slave *bond_choose_primary_or_current(struct bonding *bond) 713 { 714 struct slave *prim = rtnl_dereference(bond->primary_slave); 715 struct slave *curr = rtnl_dereference(bond->curr_active_slave); 716 717 if (!prim || prim->link != BOND_LINK_UP) { 718 if (!curr || curr->link != BOND_LINK_UP) 719 return NULL; 720 return curr; 721 } 722 723 if (bond->force_primary) { 724 bond->force_primary = false; 725 return prim; 726 } 727 728 if (!curr || curr->link != BOND_LINK_UP) 729 return prim; 730 731 /* At this point, prim and curr are both up */ 732 switch (bond->params.primary_reselect) { 733 case BOND_PRI_RESELECT_ALWAYS: 734 return prim; 735 case BOND_PRI_RESELECT_BETTER: 736 if (prim->speed < curr->speed) 737 return curr; 738 if (prim->speed == curr->speed && prim->duplex <= curr->duplex) 739 return curr; 740 return prim; 741 case BOND_PRI_RESELECT_FAILURE: 742 return curr; 743 default: 744 netdev_err(bond->dev, "impossible primary_reselect %d\n", 745 bond->params.primary_reselect); 746 return curr; 747 } 748 } 749 750 /** 751 * bond_find_best_slave - select the best available slave to be the active one 752 * @bond: our bonding struct 753 */ 754 static struct slave *bond_find_best_slave(struct bonding *bond) 755 { 756 struct slave *slave, *bestslave = NULL; 757 struct list_head *iter; 758 int mintime = bond->params.updelay; 759 760 slave = bond_choose_primary_or_current(bond); 761 if (slave) 762 return slave; 763 764 bond_for_each_slave(bond, slave, iter) { 765 if (slave->link == BOND_LINK_UP) 766 return slave; 767 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) && 768 slave->delay < mintime) { 769 mintime = slave->delay; 770 bestslave = slave; 771 } 772 } 773 774 return bestslave; 775 } 776 777 static bool bond_should_notify_peers(struct bonding *bond) 778 { 779 struct slave *slave; 780 781 rcu_read_lock(); 782 slave = rcu_dereference(bond->curr_active_slave); 783 rcu_read_unlock(); 784 785 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n", 786 slave ? slave->dev->name : "NULL"); 787 788 if (!slave || !bond->send_peer_notif || 789 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) 790 return false; 791 792 return true; 793 } 794 795 /** 796 * change_active_interface - change the active slave into the specified one 797 * @bond: our bonding struct 798 * @new: the new slave to make the active one 799 * 800 * Set the new slave to the bond's settings and unset them on the old 801 * curr_active_slave. 802 * Setting include flags, mc-list, promiscuity, allmulti, etc. 803 * 804 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, 805 * because it is apparently the best available slave we have, even though its 806 * updelay hasn't timed out yet. 807 * 808 * Caller must hold RTNL. 809 */ 810 void bond_change_active_slave(struct bonding *bond, struct slave *new_active) 811 { 812 struct slave *old_active; 813 814 ASSERT_RTNL(); 815 816 old_active = rtnl_dereference(bond->curr_active_slave); 817 818 if (old_active == new_active) 819 return; 820 821 if (new_active) { 822 new_active->last_link_up = jiffies; 823 824 if (new_active->link == BOND_LINK_BACK) { 825 if (bond_uses_primary(bond)) { 826 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n", 827 new_active->dev->name, 828 (bond->params.updelay - new_active->delay) * bond->params.miimon); 829 } 830 831 new_active->delay = 0; 832 bond_set_slave_link_state(new_active, BOND_LINK_UP); 833 834 if (BOND_MODE(bond) == BOND_MODE_8023AD) 835 bond_3ad_handle_link_change(new_active, BOND_LINK_UP); 836 837 if (bond_is_lb(bond)) 838 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); 839 } else { 840 if (bond_uses_primary(bond)) { 841 netdev_info(bond->dev, "making interface %s the new active one\n", 842 new_active->dev->name); 843 } 844 } 845 } 846 847 if (bond_uses_primary(bond)) 848 bond_hw_addr_swap(bond, new_active, old_active); 849 850 if (bond_is_lb(bond)) { 851 bond_alb_handle_active_change(bond, new_active); 852 if (old_active) 853 bond_set_slave_inactive_flags(old_active, 854 BOND_SLAVE_NOTIFY_NOW); 855 if (new_active) 856 bond_set_slave_active_flags(new_active, 857 BOND_SLAVE_NOTIFY_NOW); 858 } else { 859 rcu_assign_pointer(bond->curr_active_slave, new_active); 860 } 861 862 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) { 863 if (old_active) 864 bond_set_slave_inactive_flags(old_active, 865 BOND_SLAVE_NOTIFY_NOW); 866 867 if (new_active) { 868 bool should_notify_peers = false; 869 870 bond_set_slave_active_flags(new_active, 871 BOND_SLAVE_NOTIFY_NOW); 872 873 if (bond->params.fail_over_mac) 874 bond_do_fail_over_mac(bond, new_active, 875 old_active); 876 877 if (netif_running(bond->dev)) { 878 bond->send_peer_notif = 879 bond->params.num_peer_notif; 880 should_notify_peers = 881 bond_should_notify_peers(bond); 882 } 883 884 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev); 885 if (should_notify_peers) 886 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 887 bond->dev); 888 } 889 } 890 891 /* resend IGMP joins since active slave has changed or 892 * all were sent on curr_active_slave. 893 * resend only if bond is brought up with the affected 894 * bonding modes and the retransmission is enabled 895 */ 896 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && 897 ((bond_uses_primary(bond) && new_active) || 898 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) { 899 bond->igmp_retrans = bond->params.resend_igmp; 900 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 901 } 902 } 903 904 /** 905 * bond_select_active_slave - select a new active slave, if needed 906 * @bond: our bonding struct 907 * 908 * This functions should be called when one of the following occurs: 909 * - The old curr_active_slave has been released or lost its link. 910 * - The primary_slave has got its link back. 911 * - A slave has got its link back and there's no old curr_active_slave. 912 * 913 * Caller must hold RTNL. 914 */ 915 void bond_select_active_slave(struct bonding *bond) 916 { 917 struct slave *best_slave; 918 int rv; 919 920 ASSERT_RTNL(); 921 922 best_slave = bond_find_best_slave(bond); 923 if (best_slave != rtnl_dereference(bond->curr_active_slave)) { 924 bond_change_active_slave(bond, best_slave); 925 rv = bond_set_carrier(bond); 926 if (!rv) 927 return; 928 929 if (netif_carrier_ok(bond->dev)) { 930 netdev_info(bond->dev, "first active interface up!\n"); 931 } else { 932 netdev_info(bond->dev, "now running without any active interface!\n"); 933 } 934 } 935 } 936 937 #ifdef CONFIG_NET_POLL_CONTROLLER 938 static inline int slave_enable_netpoll(struct slave *slave) 939 { 940 struct netpoll *np; 941 int err = 0; 942 943 np = kzalloc(sizeof(*np), GFP_KERNEL); 944 err = -ENOMEM; 945 if (!np) 946 goto out; 947 948 err = __netpoll_setup(np, slave->dev); 949 if (err) { 950 kfree(np); 951 goto out; 952 } 953 slave->np = np; 954 out: 955 return err; 956 } 957 static inline void slave_disable_netpoll(struct slave *slave) 958 { 959 struct netpoll *np = slave->np; 960 961 if (!np) 962 return; 963 964 slave->np = NULL; 965 __netpoll_free_async(np); 966 } 967 968 static void bond_poll_controller(struct net_device *bond_dev) 969 { 970 struct bonding *bond = netdev_priv(bond_dev); 971 struct slave *slave = NULL; 972 struct list_head *iter; 973 struct ad_info ad_info; 974 struct netpoll_info *ni; 975 const struct net_device_ops *ops; 976 977 if (BOND_MODE(bond) == BOND_MODE_8023AD) 978 if (bond_3ad_get_active_agg_info(bond, &ad_info)) 979 return; 980 981 rcu_read_lock_bh(); 982 bond_for_each_slave_rcu(bond, slave, iter) { 983 ops = slave->dev->netdev_ops; 984 if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller) 985 continue; 986 987 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 988 struct aggregator *agg = 989 SLAVE_AD_INFO(slave)->port.aggregator; 990 991 if (agg && 992 agg->aggregator_identifier != ad_info.aggregator_id) 993 continue; 994 } 995 996 ni = rcu_dereference_bh(slave->dev->npinfo); 997 if (down_trylock(&ni->dev_lock)) 998 continue; 999 ops->ndo_poll_controller(slave->dev); 1000 up(&ni->dev_lock); 1001 } 1002 rcu_read_unlock_bh(); 1003 } 1004 1005 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1006 { 1007 struct bonding *bond = netdev_priv(bond_dev); 1008 struct list_head *iter; 1009 struct slave *slave; 1010 1011 bond_for_each_slave(bond, slave, iter) 1012 if (bond_slave_is_up(slave)) 1013 slave_disable_netpoll(slave); 1014 } 1015 1016 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) 1017 { 1018 struct bonding *bond = netdev_priv(dev); 1019 struct list_head *iter; 1020 struct slave *slave; 1021 int err = 0; 1022 1023 bond_for_each_slave(bond, slave, iter) { 1024 err = slave_enable_netpoll(slave); 1025 if (err) { 1026 bond_netpoll_cleanup(dev); 1027 break; 1028 } 1029 } 1030 return err; 1031 } 1032 #else 1033 static inline int slave_enable_netpoll(struct slave *slave) 1034 { 1035 return 0; 1036 } 1037 static inline void slave_disable_netpoll(struct slave *slave) 1038 { 1039 } 1040 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1041 { 1042 } 1043 #endif 1044 1045 /*---------------------------------- IOCTL ----------------------------------*/ 1046 1047 static netdev_features_t bond_fix_features(struct net_device *dev, 1048 netdev_features_t features) 1049 { 1050 struct bonding *bond = netdev_priv(dev); 1051 struct list_head *iter; 1052 netdev_features_t mask; 1053 struct slave *slave; 1054 1055 mask = features; 1056 1057 features &= ~NETIF_F_ONE_FOR_ALL; 1058 features |= NETIF_F_ALL_FOR_ALL; 1059 1060 bond_for_each_slave(bond, slave, iter) { 1061 features = netdev_increment_features(features, 1062 slave->dev->features, 1063 mask); 1064 } 1065 features = netdev_add_tso_features(features, mask); 1066 1067 return features; 1068 } 1069 1070 #define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \ 1071 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \ 1072 NETIF_F_HIGHDMA | NETIF_F_LRO) 1073 1074 #define BOND_ENC_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | NETIF_F_RXCSUM |\ 1075 NETIF_F_TSO) 1076 1077 static void bond_compute_features(struct bonding *bond) 1078 { 1079 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE | 1080 IFF_XMIT_DST_RELEASE_PERM; 1081 netdev_features_t vlan_features = BOND_VLAN_FEATURES; 1082 netdev_features_t enc_features = BOND_ENC_FEATURES; 1083 struct net_device *bond_dev = bond->dev; 1084 struct list_head *iter; 1085 struct slave *slave; 1086 unsigned short max_hard_header_len = ETH_HLEN; 1087 unsigned int gso_max_size = GSO_MAX_SIZE; 1088 u16 gso_max_segs = GSO_MAX_SEGS; 1089 1090 if (!bond_has_slaves(bond)) 1091 goto done; 1092 vlan_features &= NETIF_F_ALL_FOR_ALL; 1093 1094 bond_for_each_slave(bond, slave, iter) { 1095 vlan_features = netdev_increment_features(vlan_features, 1096 slave->dev->vlan_features, BOND_VLAN_FEATURES); 1097 1098 enc_features = netdev_increment_features(enc_features, 1099 slave->dev->hw_enc_features, 1100 BOND_ENC_FEATURES); 1101 dst_release_flag &= slave->dev->priv_flags; 1102 if (slave->dev->hard_header_len > max_hard_header_len) 1103 max_hard_header_len = slave->dev->hard_header_len; 1104 1105 gso_max_size = min(gso_max_size, slave->dev->gso_max_size); 1106 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs); 1107 } 1108 1109 done: 1110 bond_dev->vlan_features = vlan_features; 1111 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL; 1112 bond_dev->hard_header_len = max_hard_header_len; 1113 bond_dev->gso_max_segs = gso_max_segs; 1114 netif_set_gso_max_size(bond_dev, gso_max_size); 1115 1116 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1117 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) && 1118 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM)) 1119 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE; 1120 1121 netdev_change_features(bond_dev); 1122 } 1123 1124 static void bond_setup_by_slave(struct net_device *bond_dev, 1125 struct net_device *slave_dev) 1126 { 1127 bond_dev->header_ops = slave_dev->header_ops; 1128 1129 bond_dev->type = slave_dev->type; 1130 bond_dev->hard_header_len = slave_dev->hard_header_len; 1131 bond_dev->addr_len = slave_dev->addr_len; 1132 1133 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1134 slave_dev->addr_len); 1135 } 1136 1137 /* On bonding slaves other than the currently active slave, suppress 1138 * duplicates except for alb non-mcast/bcast. 1139 */ 1140 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1141 struct slave *slave, 1142 struct bonding *bond) 1143 { 1144 if (bond_is_slave_inactive(slave)) { 1145 if (BOND_MODE(bond) == BOND_MODE_ALB && 1146 skb->pkt_type != PACKET_BROADCAST && 1147 skb->pkt_type != PACKET_MULTICAST) 1148 return false; 1149 return true; 1150 } 1151 return false; 1152 } 1153 1154 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1155 { 1156 struct sk_buff *skb = *pskb; 1157 struct slave *slave; 1158 struct bonding *bond; 1159 int (*recv_probe)(const struct sk_buff *, struct bonding *, 1160 struct slave *); 1161 int ret = RX_HANDLER_ANOTHER; 1162 1163 skb = skb_share_check(skb, GFP_ATOMIC); 1164 if (unlikely(!skb)) 1165 return RX_HANDLER_CONSUMED; 1166 1167 *pskb = skb; 1168 1169 slave = bond_slave_get_rcu(skb->dev); 1170 bond = slave->bond; 1171 1172 recv_probe = ACCESS_ONCE(bond->recv_probe); 1173 if (recv_probe) { 1174 ret = recv_probe(skb, bond, slave); 1175 if (ret == RX_HANDLER_CONSUMED) { 1176 consume_skb(skb); 1177 return ret; 1178 } 1179 } 1180 1181 if (bond_should_deliver_exact_match(skb, slave, bond)) { 1182 return RX_HANDLER_EXACT; 1183 } 1184 1185 skb->dev = bond->dev; 1186 1187 if (BOND_MODE(bond) == BOND_MODE_ALB && 1188 bond->dev->priv_flags & IFF_BRIDGE_PORT && 1189 skb->pkt_type == PACKET_HOST) { 1190 1191 if (unlikely(skb_cow_head(skb, 1192 skb->data - skb_mac_header(skb)))) { 1193 kfree_skb(skb); 1194 return RX_HANDLER_CONSUMED; 1195 } 1196 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr); 1197 } 1198 1199 return ret; 1200 } 1201 1202 static int bond_master_upper_dev_link(struct net_device *bond_dev, 1203 struct net_device *slave_dev, 1204 struct slave *slave) 1205 { 1206 int err; 1207 1208 err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, slave); 1209 if (err) 1210 return err; 1211 slave_dev->flags |= IFF_SLAVE; 1212 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL); 1213 return 0; 1214 } 1215 1216 static void bond_upper_dev_unlink(struct net_device *bond_dev, 1217 struct net_device *slave_dev) 1218 { 1219 netdev_upper_dev_unlink(slave_dev, bond_dev); 1220 slave_dev->flags &= ~IFF_SLAVE; 1221 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL); 1222 } 1223 1224 static struct slave *bond_alloc_slave(struct bonding *bond) 1225 { 1226 struct slave *slave = NULL; 1227 1228 slave = kzalloc(sizeof(struct slave), GFP_KERNEL); 1229 if (!slave) 1230 return NULL; 1231 1232 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1233 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info), 1234 GFP_KERNEL); 1235 if (!SLAVE_AD_INFO(slave)) { 1236 kfree(slave); 1237 return NULL; 1238 } 1239 } 1240 return slave; 1241 } 1242 1243 static void bond_free_slave(struct slave *slave) 1244 { 1245 struct bonding *bond = bond_get_bond_by_slave(slave); 1246 1247 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1248 kfree(SLAVE_AD_INFO(slave)); 1249 1250 kfree(slave); 1251 } 1252 1253 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info) 1254 { 1255 info->bond_mode = BOND_MODE(bond); 1256 info->miimon = bond->params.miimon; 1257 info->num_slaves = bond->slave_cnt; 1258 } 1259 1260 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info) 1261 { 1262 strcpy(info->slave_name, slave->dev->name); 1263 info->link = slave->link; 1264 info->state = bond_slave_state(slave); 1265 info->link_failure_count = slave->link_failure_count; 1266 } 1267 1268 static void bond_netdev_notify(struct net_device *dev, 1269 struct netdev_bonding_info *info) 1270 { 1271 rtnl_lock(); 1272 netdev_bonding_info_change(dev, info); 1273 rtnl_unlock(); 1274 } 1275 1276 static void bond_netdev_notify_work(struct work_struct *_work) 1277 { 1278 struct netdev_notify_work *w = 1279 container_of(_work, struct netdev_notify_work, work.work); 1280 1281 bond_netdev_notify(w->dev, &w->bonding_info); 1282 dev_put(w->dev); 1283 kfree(w); 1284 } 1285 1286 void bond_queue_slave_event(struct slave *slave) 1287 { 1288 struct bonding *bond = slave->bond; 1289 struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC); 1290 1291 if (!nnw) 1292 return; 1293 1294 dev_hold(slave->dev); 1295 nnw->dev = slave->dev; 1296 bond_fill_ifslave(slave, &nnw->bonding_info.slave); 1297 bond_fill_ifbond(bond, &nnw->bonding_info.master); 1298 INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work); 1299 1300 queue_delayed_work(slave->bond->wq, &nnw->work, 0); 1301 } 1302 1303 /* enslave device <slave> to bond device <master> */ 1304 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev) 1305 { 1306 struct bonding *bond = netdev_priv(bond_dev); 1307 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1308 struct slave *new_slave = NULL, *prev_slave; 1309 struct sockaddr addr; 1310 int link_reporting; 1311 int res = 0, i; 1312 1313 if (!bond->params.use_carrier && 1314 slave_dev->ethtool_ops->get_link == NULL && 1315 slave_ops->ndo_do_ioctl == NULL) { 1316 netdev_warn(bond_dev, "no link monitoring support for %s\n", 1317 slave_dev->name); 1318 } 1319 1320 /* already enslaved */ 1321 if (slave_dev->flags & IFF_SLAVE) { 1322 netdev_dbg(bond_dev, "Error: Device was already enslaved\n"); 1323 return -EBUSY; 1324 } 1325 1326 if (bond_dev == slave_dev) { 1327 netdev_err(bond_dev, "cannot enslave bond to itself.\n"); 1328 return -EPERM; 1329 } 1330 1331 /* vlan challenged mutual exclusion */ 1332 /* no need to lock since we're protected by rtnl_lock */ 1333 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1334 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n", 1335 slave_dev->name); 1336 if (vlan_uses_dev(bond_dev)) { 1337 netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n", 1338 slave_dev->name, bond_dev->name); 1339 return -EPERM; 1340 } else { 1341 netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n", 1342 slave_dev->name, slave_dev->name, 1343 bond_dev->name); 1344 } 1345 } else { 1346 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n", 1347 slave_dev->name); 1348 } 1349 1350 /* Old ifenslave binaries are no longer supported. These can 1351 * be identified with moderate accuracy by the state of the slave: 1352 * the current ifenslave will set the interface down prior to 1353 * enslaving it; the old ifenslave will not. 1354 */ 1355 if ((slave_dev->flags & IFF_UP)) { 1356 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n", 1357 slave_dev->name); 1358 res = -EPERM; 1359 goto err_undo_flags; 1360 } 1361 1362 /* set bonding device ether type by slave - bonding netdevices are 1363 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1364 * there is a need to override some of the type dependent attribs/funcs. 1365 * 1366 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1367 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1368 */ 1369 if (!bond_has_slaves(bond)) { 1370 if (bond_dev->type != slave_dev->type) { 1371 netdev_dbg(bond_dev, "change device type from %d to %d\n", 1372 bond_dev->type, slave_dev->type); 1373 1374 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, 1375 bond_dev); 1376 res = notifier_to_errno(res); 1377 if (res) { 1378 netdev_err(bond_dev, "refused to change device type\n"); 1379 res = -EBUSY; 1380 goto err_undo_flags; 1381 } 1382 1383 /* Flush unicast and multicast addresses */ 1384 dev_uc_flush(bond_dev); 1385 dev_mc_flush(bond_dev); 1386 1387 if (slave_dev->type != ARPHRD_ETHER) 1388 bond_setup_by_slave(bond_dev, slave_dev); 1389 else { 1390 ether_setup(bond_dev); 1391 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1392 } 1393 1394 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, 1395 bond_dev); 1396 } 1397 } else if (bond_dev->type != slave_dev->type) { 1398 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n", 1399 slave_dev->name, slave_dev->type, bond_dev->type); 1400 res = -EINVAL; 1401 goto err_undo_flags; 1402 } 1403 1404 if (slave_ops->ndo_set_mac_address == NULL) { 1405 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n"); 1406 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP && 1407 bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1408 if (!bond_has_slaves(bond)) { 1409 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1410 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n"); 1411 } else { 1412 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"); 1413 res = -EOPNOTSUPP; 1414 goto err_undo_flags; 1415 } 1416 } 1417 } 1418 1419 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1420 1421 /* If this is the first slave, then we need to set the master's hardware 1422 * address to be the same as the slave's. 1423 */ 1424 if (!bond_has_slaves(bond) && 1425 bond->dev->addr_assign_type == NET_ADDR_RANDOM) 1426 bond_set_dev_addr(bond->dev, slave_dev); 1427 1428 new_slave = bond_alloc_slave(bond); 1429 if (!new_slave) { 1430 res = -ENOMEM; 1431 goto err_undo_flags; 1432 } 1433 1434 new_slave->bond = bond; 1435 new_slave->dev = slave_dev; 1436 /* Set the new_slave's queue_id to be zero. Queue ID mapping 1437 * is set via sysfs or module option if desired. 1438 */ 1439 new_slave->queue_id = 0; 1440 1441 /* Save slave's original mtu and then set it to match the bond */ 1442 new_slave->original_mtu = slave_dev->mtu; 1443 res = dev_set_mtu(slave_dev, bond->dev->mtu); 1444 if (res) { 1445 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res); 1446 goto err_free; 1447 } 1448 1449 /* Save slave's original ("permanent") mac address for modes 1450 * that need it, and for restoring it upon release, and then 1451 * set it to the master's address 1452 */ 1453 ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr); 1454 1455 if (!bond->params.fail_over_mac || 1456 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1457 /* Set slave to master's mac address. The application already 1458 * set the master's mac address to that of the first slave 1459 */ 1460 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 1461 addr.sa_family = slave_dev->type; 1462 res = dev_set_mac_address(slave_dev, &addr); 1463 if (res) { 1464 netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res); 1465 goto err_restore_mtu; 1466 } 1467 } 1468 1469 /* open the slave since the application closed it */ 1470 res = dev_open(slave_dev); 1471 if (res) { 1472 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name); 1473 goto err_restore_mac; 1474 } 1475 1476 slave_dev->priv_flags |= IFF_BONDING; 1477 /* initialize slave stats */ 1478 dev_get_stats(new_slave->dev, &new_slave->slave_stats); 1479 1480 if (bond_is_lb(bond)) { 1481 /* bond_alb_init_slave() must be called before all other stages since 1482 * it might fail and we do not want to have to undo everything 1483 */ 1484 res = bond_alb_init_slave(bond, new_slave); 1485 if (res) 1486 goto err_close; 1487 } 1488 1489 /* If the mode uses primary, then the following is handled by 1490 * bond_change_active_slave(). 1491 */ 1492 if (!bond_uses_primary(bond)) { 1493 /* set promiscuity level to new slave */ 1494 if (bond_dev->flags & IFF_PROMISC) { 1495 res = dev_set_promiscuity(slave_dev, 1); 1496 if (res) 1497 goto err_close; 1498 } 1499 1500 /* set allmulti level to new slave */ 1501 if (bond_dev->flags & IFF_ALLMULTI) { 1502 res = dev_set_allmulti(slave_dev, 1); 1503 if (res) 1504 goto err_close; 1505 } 1506 1507 netif_addr_lock_bh(bond_dev); 1508 1509 dev_mc_sync_multiple(slave_dev, bond_dev); 1510 dev_uc_sync_multiple(slave_dev, bond_dev); 1511 1512 netif_addr_unlock_bh(bond_dev); 1513 } 1514 1515 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1516 /* add lacpdu mc addr to mc list */ 1517 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 1518 1519 dev_mc_add(slave_dev, lacpdu_multicast); 1520 } 1521 1522 res = vlan_vids_add_by_dev(slave_dev, bond_dev); 1523 if (res) { 1524 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n", 1525 slave_dev->name); 1526 goto err_close; 1527 } 1528 1529 prev_slave = bond_last_slave(bond); 1530 1531 new_slave->delay = 0; 1532 new_slave->link_failure_count = 0; 1533 1534 bond_update_speed_duplex(new_slave); 1535 1536 new_slave->last_rx = jiffies - 1537 (msecs_to_jiffies(bond->params.arp_interval) + 1); 1538 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) 1539 new_slave->target_last_arp_rx[i] = new_slave->last_rx; 1540 1541 if (bond->params.miimon && !bond->params.use_carrier) { 1542 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 1543 1544 if ((link_reporting == -1) && !bond->params.arp_interval) { 1545 /* miimon is set but a bonded network driver 1546 * does not support ETHTOOL/MII and 1547 * arp_interval is not set. Note: if 1548 * use_carrier is enabled, we will never go 1549 * here (because netif_carrier is always 1550 * supported); thus, we don't need to change 1551 * the messages for netif_carrier. 1552 */ 1553 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", 1554 slave_dev->name); 1555 } else if (link_reporting == -1) { 1556 /* unable get link status using mii/ethtool */ 1557 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", 1558 slave_dev->name); 1559 } 1560 } 1561 1562 /* check for initial state */ 1563 if (bond->params.miimon) { 1564 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { 1565 if (bond->params.updelay) { 1566 bond_set_slave_link_state(new_slave, 1567 BOND_LINK_BACK); 1568 new_slave->delay = bond->params.updelay; 1569 } else { 1570 bond_set_slave_link_state(new_slave, 1571 BOND_LINK_UP); 1572 } 1573 } else { 1574 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN); 1575 } 1576 } else if (bond->params.arp_interval) { 1577 bond_set_slave_link_state(new_slave, 1578 (netif_carrier_ok(slave_dev) ? 1579 BOND_LINK_UP : BOND_LINK_DOWN)); 1580 } else { 1581 bond_set_slave_link_state(new_slave, BOND_LINK_UP); 1582 } 1583 1584 if (new_slave->link != BOND_LINK_DOWN) 1585 new_slave->last_link_up = jiffies; 1586 netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n", 1587 new_slave->link == BOND_LINK_DOWN ? "DOWN" : 1588 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); 1589 1590 if (bond_uses_primary(bond) && bond->params.primary[0]) { 1591 /* if there is a primary slave, remember it */ 1592 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 1593 rcu_assign_pointer(bond->primary_slave, new_slave); 1594 bond->force_primary = true; 1595 } 1596 } 1597 1598 switch (BOND_MODE(bond)) { 1599 case BOND_MODE_ACTIVEBACKUP: 1600 bond_set_slave_inactive_flags(new_slave, 1601 BOND_SLAVE_NOTIFY_NOW); 1602 break; 1603 case BOND_MODE_8023AD: 1604 /* in 802.3ad mode, the internal mechanism 1605 * will activate the slaves in the selected 1606 * aggregator 1607 */ 1608 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 1609 /* if this is the first slave */ 1610 if (!prev_slave) { 1611 SLAVE_AD_INFO(new_slave)->id = 1; 1612 /* Initialize AD with the number of times that the AD timer is called in 1 second 1613 * can be called only after the mac address of the bond is set 1614 */ 1615 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL); 1616 } else { 1617 SLAVE_AD_INFO(new_slave)->id = 1618 SLAVE_AD_INFO(prev_slave)->id + 1; 1619 } 1620 1621 bond_3ad_bind_slave(new_slave); 1622 break; 1623 case BOND_MODE_TLB: 1624 case BOND_MODE_ALB: 1625 bond_set_active_slave(new_slave); 1626 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 1627 break; 1628 default: 1629 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n"); 1630 1631 /* always active in trunk mode */ 1632 bond_set_active_slave(new_slave); 1633 1634 /* In trunking mode there is little meaning to curr_active_slave 1635 * anyway (it holds no special properties of the bond device), 1636 * so we can change it without calling change_active_interface() 1637 */ 1638 if (!rcu_access_pointer(bond->curr_active_slave) && 1639 new_slave->link == BOND_LINK_UP) 1640 rcu_assign_pointer(bond->curr_active_slave, new_slave); 1641 1642 break; 1643 } /* switch(bond_mode) */ 1644 1645 #ifdef CONFIG_NET_POLL_CONTROLLER 1646 slave_dev->npinfo = bond->dev->npinfo; 1647 if (slave_dev->npinfo) { 1648 if (slave_enable_netpoll(new_slave)) { 1649 netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n"); 1650 res = -EBUSY; 1651 goto err_detach; 1652 } 1653 } 1654 #endif 1655 1656 if (!(bond_dev->features & NETIF_F_LRO)) 1657 dev_disable_lro(slave_dev); 1658 1659 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 1660 new_slave); 1661 if (res) { 1662 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res); 1663 goto err_detach; 1664 } 1665 1666 res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave); 1667 if (res) { 1668 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res); 1669 goto err_unregister; 1670 } 1671 1672 res = bond_sysfs_slave_add(new_slave); 1673 if (res) { 1674 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res); 1675 goto err_upper_unlink; 1676 } 1677 1678 bond->slave_cnt++; 1679 bond_compute_features(bond); 1680 bond_set_carrier(bond); 1681 1682 if (bond_uses_primary(bond)) { 1683 block_netpoll_tx(); 1684 bond_select_active_slave(bond); 1685 unblock_netpoll_tx(); 1686 } 1687 1688 if (bond_mode_uses_xmit_hash(bond)) 1689 bond_update_slave_arr(bond, NULL); 1690 1691 netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n", 1692 slave_dev->name, 1693 bond_is_active_slave(new_slave) ? "an active" : "a backup", 1694 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down"); 1695 1696 /* enslave is successful */ 1697 bond_queue_slave_event(new_slave); 1698 return 0; 1699 1700 /* Undo stages on error */ 1701 err_upper_unlink: 1702 bond_upper_dev_unlink(bond_dev, slave_dev); 1703 1704 err_unregister: 1705 netdev_rx_handler_unregister(slave_dev); 1706 1707 err_detach: 1708 if (!bond_uses_primary(bond)) 1709 bond_hw_addr_flush(bond_dev, slave_dev); 1710 1711 vlan_vids_del_by_dev(slave_dev, bond_dev); 1712 if (rcu_access_pointer(bond->primary_slave) == new_slave) 1713 RCU_INIT_POINTER(bond->primary_slave, NULL); 1714 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) { 1715 block_netpoll_tx(); 1716 bond_change_active_slave(bond, NULL); 1717 bond_select_active_slave(bond); 1718 unblock_netpoll_tx(); 1719 } 1720 /* either primary_slave or curr_active_slave might've changed */ 1721 synchronize_rcu(); 1722 slave_disable_netpoll(new_slave); 1723 1724 err_close: 1725 slave_dev->priv_flags &= ~IFF_BONDING; 1726 dev_close(slave_dev); 1727 1728 err_restore_mac: 1729 if (!bond->params.fail_over_mac || 1730 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1731 /* XXX TODO - fom follow mode needs to change master's 1732 * MAC if this slave's MAC is in use by the bond, or at 1733 * least print a warning. 1734 */ 1735 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr); 1736 addr.sa_family = slave_dev->type; 1737 dev_set_mac_address(slave_dev, &addr); 1738 } 1739 1740 err_restore_mtu: 1741 dev_set_mtu(slave_dev, new_slave->original_mtu); 1742 1743 err_free: 1744 bond_free_slave(new_slave); 1745 1746 err_undo_flags: 1747 /* Enslave of first slave has failed and we need to fix master's mac */ 1748 if (!bond_has_slaves(bond)) { 1749 if (ether_addr_equal_64bits(bond_dev->dev_addr, 1750 slave_dev->dev_addr)) 1751 eth_hw_addr_random(bond_dev); 1752 if (bond_dev->type != ARPHRD_ETHER) { 1753 ether_setup(bond_dev); 1754 bond_dev->flags |= IFF_MASTER; 1755 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1756 } 1757 } 1758 1759 return res; 1760 } 1761 1762 /* Try to release the slave device <slave> from the bond device <master> 1763 * It is legal to access curr_active_slave without a lock because all the function 1764 * is RTNL-locked. If "all" is true it means that the function is being called 1765 * while destroying a bond interface and all slaves are being released. 1766 * 1767 * The rules for slave state should be: 1768 * for Active/Backup: 1769 * Active stays on all backups go down 1770 * for Bonded connections: 1771 * The first up interface should be left on and all others downed. 1772 */ 1773 static int __bond_release_one(struct net_device *bond_dev, 1774 struct net_device *slave_dev, 1775 bool all) 1776 { 1777 struct bonding *bond = netdev_priv(bond_dev); 1778 struct slave *slave, *oldcurrent; 1779 struct sockaddr addr; 1780 int old_flags = bond_dev->flags; 1781 netdev_features_t old_features = bond_dev->features; 1782 1783 /* slave is not a slave or master is not master of this slave */ 1784 if (!(slave_dev->flags & IFF_SLAVE) || 1785 !netdev_has_upper_dev(slave_dev, bond_dev)) { 1786 netdev_dbg(bond_dev, "cannot release %s\n", 1787 slave_dev->name); 1788 return -EINVAL; 1789 } 1790 1791 block_netpoll_tx(); 1792 1793 slave = bond_get_slave_by_dev(bond, slave_dev); 1794 if (!slave) { 1795 /* not a slave of this bond */ 1796 netdev_info(bond_dev, "%s not enslaved\n", 1797 slave_dev->name); 1798 unblock_netpoll_tx(); 1799 return -EINVAL; 1800 } 1801 1802 bond_sysfs_slave_del(slave); 1803 1804 /* recompute stats just before removing the slave */ 1805 bond_get_stats(bond->dev, &bond->bond_stats); 1806 1807 bond_upper_dev_unlink(bond_dev, slave_dev); 1808 /* unregister rx_handler early so bond_handle_frame wouldn't be called 1809 * for this slave anymore. 1810 */ 1811 netdev_rx_handler_unregister(slave_dev); 1812 1813 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1814 bond_3ad_unbind_slave(slave); 1815 1816 if (bond_mode_uses_xmit_hash(bond)) 1817 bond_update_slave_arr(bond, slave); 1818 1819 netdev_info(bond_dev, "Releasing %s interface %s\n", 1820 bond_is_active_slave(slave) ? "active" : "backup", 1821 slave_dev->name); 1822 1823 oldcurrent = rcu_access_pointer(bond->curr_active_slave); 1824 1825 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 1826 1827 if (!all && (!bond->params.fail_over_mac || 1828 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) { 1829 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) && 1830 bond_has_slaves(bond)) 1831 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", 1832 slave_dev->name, slave->perm_hwaddr, 1833 bond_dev->name, slave_dev->name); 1834 } 1835 1836 if (rtnl_dereference(bond->primary_slave) == slave) 1837 RCU_INIT_POINTER(bond->primary_slave, NULL); 1838 1839 if (oldcurrent == slave) 1840 bond_change_active_slave(bond, NULL); 1841 1842 if (bond_is_lb(bond)) { 1843 /* Must be called only after the slave has been 1844 * detached from the list and the curr_active_slave 1845 * has been cleared (if our_slave == old_current), 1846 * but before a new active slave is selected. 1847 */ 1848 bond_alb_deinit_slave(bond, slave); 1849 } 1850 1851 if (all) { 1852 RCU_INIT_POINTER(bond->curr_active_slave, NULL); 1853 } else if (oldcurrent == slave) { 1854 /* Note that we hold RTNL over this sequence, so there 1855 * is no concern that another slave add/remove event 1856 * will interfere. 1857 */ 1858 bond_select_active_slave(bond); 1859 } 1860 1861 if (!bond_has_slaves(bond)) { 1862 bond_set_carrier(bond); 1863 eth_hw_addr_random(bond_dev); 1864 } 1865 1866 unblock_netpoll_tx(); 1867 synchronize_rcu(); 1868 bond->slave_cnt--; 1869 1870 if (!bond_has_slaves(bond)) { 1871 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 1872 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev); 1873 } 1874 1875 bond_compute_features(bond); 1876 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 1877 (old_features & NETIF_F_VLAN_CHALLENGED)) 1878 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n", 1879 slave_dev->name, bond_dev->name); 1880 1881 vlan_vids_del_by_dev(slave_dev, bond_dev); 1882 1883 /* If the mode uses primary, then this case was handled above by 1884 * bond_change_active_slave(..., NULL) 1885 */ 1886 if (!bond_uses_primary(bond)) { 1887 /* unset promiscuity level from slave 1888 * NOTE: The NETDEV_CHANGEADDR call above may change the value 1889 * of the IFF_PROMISC flag in the bond_dev, but we need the 1890 * value of that flag before that change, as that was the value 1891 * when this slave was attached, so we cache at the start of the 1892 * function and use it here. Same goes for ALLMULTI below 1893 */ 1894 if (old_flags & IFF_PROMISC) 1895 dev_set_promiscuity(slave_dev, -1); 1896 1897 /* unset allmulti level from slave */ 1898 if (old_flags & IFF_ALLMULTI) 1899 dev_set_allmulti(slave_dev, -1); 1900 1901 bond_hw_addr_flush(bond_dev, slave_dev); 1902 } 1903 1904 slave_disable_netpoll(slave); 1905 1906 /* close slave before restoring its mac address */ 1907 dev_close(slave_dev); 1908 1909 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE || 1910 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1911 /* restore original ("permanent") mac address */ 1912 ether_addr_copy(addr.sa_data, slave->perm_hwaddr); 1913 addr.sa_family = slave_dev->type; 1914 dev_set_mac_address(slave_dev, &addr); 1915 } 1916 1917 dev_set_mtu(slave_dev, slave->original_mtu); 1918 1919 slave_dev->priv_flags &= ~IFF_BONDING; 1920 1921 bond_free_slave(slave); 1922 1923 return 0; 1924 } 1925 1926 /* A wrapper used because of ndo_del_link */ 1927 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 1928 { 1929 return __bond_release_one(bond_dev, slave_dev, false); 1930 } 1931 1932 /* First release a slave and then destroy the bond if no more slaves are left. 1933 * Must be under rtnl_lock when this function is called. 1934 */ 1935 static int bond_release_and_destroy(struct net_device *bond_dev, 1936 struct net_device *slave_dev) 1937 { 1938 struct bonding *bond = netdev_priv(bond_dev); 1939 int ret; 1940 1941 ret = bond_release(bond_dev, slave_dev); 1942 if (ret == 0 && !bond_has_slaves(bond)) { 1943 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 1944 netdev_info(bond_dev, "Destroying bond %s\n", 1945 bond_dev->name); 1946 bond_remove_proc_entry(bond); 1947 unregister_netdevice(bond_dev); 1948 } 1949 return ret; 1950 } 1951 1952 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info) 1953 { 1954 struct bonding *bond = netdev_priv(bond_dev); 1955 bond_fill_ifbond(bond, info); 1956 return 0; 1957 } 1958 1959 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 1960 { 1961 struct bonding *bond = netdev_priv(bond_dev); 1962 struct list_head *iter; 1963 int i = 0, res = -ENODEV; 1964 struct slave *slave; 1965 1966 bond_for_each_slave(bond, slave, iter) { 1967 if (i++ == (int)info->slave_id) { 1968 res = 0; 1969 bond_fill_ifslave(slave, info); 1970 break; 1971 } 1972 } 1973 1974 return res; 1975 } 1976 1977 /*-------------------------------- Monitoring -------------------------------*/ 1978 1979 /* called with rcu_read_lock() */ 1980 static int bond_miimon_inspect(struct bonding *bond) 1981 { 1982 int link_state, commit = 0; 1983 struct list_head *iter; 1984 struct slave *slave; 1985 bool ignore_updelay; 1986 1987 ignore_updelay = !rcu_dereference(bond->curr_active_slave); 1988 1989 bond_for_each_slave_rcu(bond, slave, iter) { 1990 slave->new_link = BOND_LINK_NOCHANGE; 1991 1992 link_state = bond_check_dev_link(bond, slave->dev, 0); 1993 1994 switch (slave->link) { 1995 case BOND_LINK_UP: 1996 if (link_state) 1997 continue; 1998 1999 bond_set_slave_link_state(slave, BOND_LINK_FAIL); 2000 slave->delay = bond->params.downdelay; 2001 if (slave->delay) { 2002 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n", 2003 (BOND_MODE(bond) == 2004 BOND_MODE_ACTIVEBACKUP) ? 2005 (bond_is_active_slave(slave) ? 2006 "active " : "backup ") : "", 2007 slave->dev->name, 2008 bond->params.downdelay * bond->params.miimon); 2009 } 2010 /*FALLTHRU*/ 2011 case BOND_LINK_FAIL: 2012 if (link_state) { 2013 /* recovered before downdelay expired */ 2014 bond_set_slave_link_state(slave, BOND_LINK_UP); 2015 slave->last_link_up = jiffies; 2016 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n", 2017 (bond->params.downdelay - slave->delay) * 2018 bond->params.miimon, 2019 slave->dev->name); 2020 continue; 2021 } 2022 2023 if (slave->delay <= 0) { 2024 slave->new_link = BOND_LINK_DOWN; 2025 commit++; 2026 continue; 2027 } 2028 2029 slave->delay--; 2030 break; 2031 2032 case BOND_LINK_DOWN: 2033 if (!link_state) 2034 continue; 2035 2036 bond_set_slave_link_state(slave, BOND_LINK_BACK); 2037 slave->delay = bond->params.updelay; 2038 2039 if (slave->delay) { 2040 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n", 2041 slave->dev->name, 2042 ignore_updelay ? 0 : 2043 bond->params.updelay * 2044 bond->params.miimon); 2045 } 2046 /*FALLTHRU*/ 2047 case BOND_LINK_BACK: 2048 if (!link_state) { 2049 bond_set_slave_link_state(slave, 2050 BOND_LINK_DOWN); 2051 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n", 2052 (bond->params.updelay - slave->delay) * 2053 bond->params.miimon, 2054 slave->dev->name); 2055 2056 continue; 2057 } 2058 2059 if (ignore_updelay) 2060 slave->delay = 0; 2061 2062 if (slave->delay <= 0) { 2063 slave->new_link = BOND_LINK_UP; 2064 commit++; 2065 ignore_updelay = false; 2066 continue; 2067 } 2068 2069 slave->delay--; 2070 break; 2071 } 2072 } 2073 2074 return commit; 2075 } 2076 2077 static void bond_miimon_commit(struct bonding *bond) 2078 { 2079 struct list_head *iter; 2080 struct slave *slave, *primary; 2081 2082 bond_for_each_slave(bond, slave, iter) { 2083 switch (slave->new_link) { 2084 case BOND_LINK_NOCHANGE: 2085 continue; 2086 2087 case BOND_LINK_UP: 2088 bond_set_slave_link_state(slave, BOND_LINK_UP); 2089 slave->last_link_up = jiffies; 2090 2091 primary = rtnl_dereference(bond->primary_slave); 2092 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 2093 /* prevent it from being the active one */ 2094 bond_set_backup_slave(slave); 2095 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2096 /* make it immediately active */ 2097 bond_set_active_slave(slave); 2098 } else if (slave != primary) { 2099 /* prevent it from being the active one */ 2100 bond_set_backup_slave(slave); 2101 } 2102 2103 netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n", 2104 slave->dev->name, 2105 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed, 2106 slave->duplex ? "full" : "half"); 2107 2108 /* notify ad that the link status has changed */ 2109 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2110 bond_3ad_handle_link_change(slave, BOND_LINK_UP); 2111 2112 if (bond_is_lb(bond)) 2113 bond_alb_handle_link_change(bond, slave, 2114 BOND_LINK_UP); 2115 2116 if (BOND_MODE(bond) == BOND_MODE_XOR) 2117 bond_update_slave_arr(bond, NULL); 2118 2119 if (!bond->curr_active_slave || slave == primary) 2120 goto do_failover; 2121 2122 continue; 2123 2124 case BOND_LINK_DOWN: 2125 if (slave->link_failure_count < UINT_MAX) 2126 slave->link_failure_count++; 2127 2128 bond_set_slave_link_state(slave, BOND_LINK_DOWN); 2129 2130 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP || 2131 BOND_MODE(bond) == BOND_MODE_8023AD) 2132 bond_set_slave_inactive_flags(slave, 2133 BOND_SLAVE_NOTIFY_NOW); 2134 2135 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n", 2136 slave->dev->name); 2137 2138 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2139 bond_3ad_handle_link_change(slave, 2140 BOND_LINK_DOWN); 2141 2142 if (bond_is_lb(bond)) 2143 bond_alb_handle_link_change(bond, slave, 2144 BOND_LINK_DOWN); 2145 2146 if (BOND_MODE(bond) == BOND_MODE_XOR) 2147 bond_update_slave_arr(bond, NULL); 2148 2149 if (slave == rcu_access_pointer(bond->curr_active_slave)) 2150 goto do_failover; 2151 2152 continue; 2153 2154 default: 2155 netdev_err(bond->dev, "invalid new link %d on slave %s\n", 2156 slave->new_link, slave->dev->name); 2157 slave->new_link = BOND_LINK_NOCHANGE; 2158 2159 continue; 2160 } 2161 2162 do_failover: 2163 block_netpoll_tx(); 2164 bond_select_active_slave(bond); 2165 unblock_netpoll_tx(); 2166 } 2167 2168 bond_set_carrier(bond); 2169 } 2170 2171 /* bond_mii_monitor 2172 * 2173 * Really a wrapper that splits the mii monitor into two phases: an 2174 * inspection, then (if inspection indicates something needs to be done) 2175 * an acquisition of appropriate locks followed by a commit phase to 2176 * implement whatever link state changes are indicated. 2177 */ 2178 static void bond_mii_monitor(struct work_struct *work) 2179 { 2180 struct bonding *bond = container_of(work, struct bonding, 2181 mii_work.work); 2182 bool should_notify_peers = false; 2183 unsigned long delay; 2184 2185 delay = msecs_to_jiffies(bond->params.miimon); 2186 2187 if (!bond_has_slaves(bond)) 2188 goto re_arm; 2189 2190 rcu_read_lock(); 2191 2192 should_notify_peers = bond_should_notify_peers(bond); 2193 2194 if (bond_miimon_inspect(bond)) { 2195 rcu_read_unlock(); 2196 2197 /* Race avoidance with bond_close cancel of workqueue */ 2198 if (!rtnl_trylock()) { 2199 delay = 1; 2200 should_notify_peers = false; 2201 goto re_arm; 2202 } 2203 2204 bond_miimon_commit(bond); 2205 2206 rtnl_unlock(); /* might sleep, hold no other locks */ 2207 } else 2208 rcu_read_unlock(); 2209 2210 re_arm: 2211 if (bond->params.miimon) 2212 queue_delayed_work(bond->wq, &bond->mii_work, delay); 2213 2214 if (should_notify_peers) { 2215 if (!rtnl_trylock()) 2216 return; 2217 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); 2218 rtnl_unlock(); 2219 } 2220 } 2221 2222 static bool bond_has_this_ip(struct bonding *bond, __be32 ip) 2223 { 2224 struct net_device *upper; 2225 struct list_head *iter; 2226 bool ret = false; 2227 2228 if (ip == bond_confirm_addr(bond->dev, 0, ip)) 2229 return true; 2230 2231 rcu_read_lock(); 2232 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) { 2233 if (ip == bond_confirm_addr(upper, 0, ip)) { 2234 ret = true; 2235 break; 2236 } 2237 } 2238 rcu_read_unlock(); 2239 2240 return ret; 2241 } 2242 2243 /* We go to the (large) trouble of VLAN tagging ARP frames because 2244 * switches in VLAN mode (especially if ports are configured as 2245 * "native" to a VLAN) might not pass non-tagged frames. 2246 */ 2247 static void bond_arp_send(struct net_device *slave_dev, int arp_op, 2248 __be32 dest_ip, __be32 src_ip, 2249 struct bond_vlan_tag *tags) 2250 { 2251 struct sk_buff *skb; 2252 struct bond_vlan_tag *outer_tag = tags; 2253 2254 netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n", 2255 arp_op, slave_dev->name, &dest_ip, &src_ip); 2256 2257 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2258 NULL, slave_dev->dev_addr, NULL); 2259 2260 if (!skb) { 2261 net_err_ratelimited("ARP packet allocation failed\n"); 2262 return; 2263 } 2264 2265 if (!tags || tags->vlan_proto == VLAN_N_VID) 2266 goto xmit; 2267 2268 tags++; 2269 2270 /* Go through all the tags backwards and add them to the packet */ 2271 while (tags->vlan_proto != VLAN_N_VID) { 2272 if (!tags->vlan_id) { 2273 tags++; 2274 continue; 2275 } 2276 2277 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n", 2278 ntohs(outer_tag->vlan_proto), tags->vlan_id); 2279 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto, 2280 tags->vlan_id); 2281 if (!skb) { 2282 net_err_ratelimited("failed to insert inner VLAN tag\n"); 2283 return; 2284 } 2285 2286 tags++; 2287 } 2288 /* Set the outer tag */ 2289 if (outer_tag->vlan_id) { 2290 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n", 2291 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id); 2292 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto, 2293 outer_tag->vlan_id); 2294 } 2295 2296 xmit: 2297 arp_xmit(skb); 2298 } 2299 2300 /* Validate the device path between the @start_dev and the @end_dev. 2301 * The path is valid if the @end_dev is reachable through device 2302 * stacking. 2303 * When the path is validated, collect any vlan information in the 2304 * path. 2305 */ 2306 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev, 2307 struct net_device *end_dev, 2308 int level) 2309 { 2310 struct bond_vlan_tag *tags; 2311 struct net_device *upper; 2312 struct list_head *iter; 2313 2314 if (start_dev == end_dev) { 2315 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC); 2316 if (!tags) 2317 return ERR_PTR(-ENOMEM); 2318 tags[level].vlan_proto = VLAN_N_VID; 2319 return tags; 2320 } 2321 2322 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) { 2323 tags = bond_verify_device_path(upper, end_dev, level + 1); 2324 if (IS_ERR_OR_NULL(tags)) { 2325 if (IS_ERR(tags)) 2326 return tags; 2327 continue; 2328 } 2329 if (is_vlan_dev(upper)) { 2330 tags[level].vlan_proto = vlan_dev_vlan_proto(upper); 2331 tags[level].vlan_id = vlan_dev_vlan_id(upper); 2332 } 2333 2334 return tags; 2335 } 2336 2337 return NULL; 2338 } 2339 2340 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2341 { 2342 struct rtable *rt; 2343 struct bond_vlan_tag *tags; 2344 __be32 *targets = bond->params.arp_targets, addr; 2345 int i; 2346 2347 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) { 2348 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]); 2349 tags = NULL; 2350 2351 /* Find out through which dev should the packet go */ 2352 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 2353 RTO_ONLINK, 0); 2354 if (IS_ERR(rt)) { 2355 /* there's no route to target - try to send arp 2356 * probe to generate any traffic (arp_validate=0) 2357 */ 2358 if (bond->params.arp_validate) 2359 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n", 2360 bond->dev->name, 2361 &targets[i]); 2362 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2363 0, tags); 2364 continue; 2365 } 2366 2367 /* bond device itself */ 2368 if (rt->dst.dev == bond->dev) 2369 goto found; 2370 2371 rcu_read_lock(); 2372 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0); 2373 rcu_read_unlock(); 2374 2375 if (!IS_ERR_OR_NULL(tags)) 2376 goto found; 2377 2378 /* Not our device - skip */ 2379 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n", 2380 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL"); 2381 2382 ip_rt_put(rt); 2383 continue; 2384 2385 found: 2386 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0); 2387 ip_rt_put(rt); 2388 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2389 addr, tags); 2390 kfree(tags); 2391 } 2392 } 2393 2394 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 2395 { 2396 int i; 2397 2398 if (!sip || !bond_has_this_ip(bond, tip)) { 2399 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n", 2400 &sip, &tip); 2401 return; 2402 } 2403 2404 i = bond_get_targets_ip(bond->params.arp_targets, sip); 2405 if (i == -1) { 2406 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n", 2407 &sip); 2408 return; 2409 } 2410 slave->last_rx = jiffies; 2411 slave->target_last_arp_rx[i] = jiffies; 2412 } 2413 2414 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, 2415 struct slave *slave) 2416 { 2417 struct arphdr *arp = (struct arphdr *)skb->data; 2418 struct slave *curr_active_slave; 2419 unsigned char *arp_ptr; 2420 __be32 sip, tip; 2421 int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP); 2422 2423 if (!slave_do_arp_validate(bond, slave)) { 2424 if ((slave_do_arp_validate_only(bond) && is_arp) || 2425 !slave_do_arp_validate_only(bond)) 2426 slave->last_rx = jiffies; 2427 return RX_HANDLER_ANOTHER; 2428 } else if (!is_arp) { 2429 return RX_HANDLER_ANOTHER; 2430 } 2431 2432 alen = arp_hdr_len(bond->dev); 2433 2434 netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n", 2435 skb->dev->name); 2436 2437 if (alen > skb_headlen(skb)) { 2438 arp = kmalloc(alen, GFP_ATOMIC); 2439 if (!arp) 2440 goto out_unlock; 2441 if (skb_copy_bits(skb, 0, arp, alen) < 0) 2442 goto out_unlock; 2443 } 2444 2445 if (arp->ar_hln != bond->dev->addr_len || 2446 skb->pkt_type == PACKET_OTHERHOST || 2447 skb->pkt_type == PACKET_LOOPBACK || 2448 arp->ar_hrd != htons(ARPHRD_ETHER) || 2449 arp->ar_pro != htons(ETH_P_IP) || 2450 arp->ar_pln != 4) 2451 goto out_unlock; 2452 2453 arp_ptr = (unsigned char *)(arp + 1); 2454 arp_ptr += bond->dev->addr_len; 2455 memcpy(&sip, arp_ptr, 4); 2456 arp_ptr += 4 + bond->dev->addr_len; 2457 memcpy(&tip, arp_ptr, 4); 2458 2459 netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n", 2460 slave->dev->name, bond_slave_state(slave), 2461 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 2462 &sip, &tip); 2463 2464 curr_active_slave = rcu_dereference(bond->curr_active_slave); 2465 2466 /* Backup slaves won't see the ARP reply, but do come through 2467 * here for each ARP probe (so we swap the sip/tip to validate 2468 * the probe). In a "redundant switch, common router" type of 2469 * configuration, the ARP probe will (hopefully) travel from 2470 * the active, through one switch, the router, then the other 2471 * switch before reaching the backup. 2472 * 2473 * We 'trust' the arp requests if there is an active slave and 2474 * it received valid arp reply(s) after it became active. This 2475 * is done to avoid endless looping when we can't reach the 2476 * arp_ip_target and fool ourselves with our own arp requests. 2477 */ 2478 2479 if (bond_is_active_slave(slave)) 2480 bond_validate_arp(bond, slave, sip, tip); 2481 else if (curr_active_slave && 2482 time_after(slave_last_rx(bond, curr_active_slave), 2483 curr_active_slave->last_link_up)) 2484 bond_validate_arp(bond, slave, tip, sip); 2485 2486 out_unlock: 2487 if (arp != (struct arphdr *)skb->data) 2488 kfree(arp); 2489 return RX_HANDLER_ANOTHER; 2490 } 2491 2492 /* function to verify if we're in the arp_interval timeslice, returns true if 2493 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval + 2494 * arp_interval/2) . the arp_interval/2 is needed for really fast networks. 2495 */ 2496 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 2497 int mod) 2498 { 2499 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2500 2501 return time_in_range(jiffies, 2502 last_act - delta_in_ticks, 2503 last_act + mod * delta_in_ticks + delta_in_ticks/2); 2504 } 2505 2506 /* This function is called regularly to monitor each slave's link 2507 * ensuring that traffic is being sent and received when arp monitoring 2508 * is used in load-balancing mode. if the adapter has been dormant, then an 2509 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 2510 * arp monitoring in active backup mode. 2511 */ 2512 static void bond_loadbalance_arp_mon(struct work_struct *work) 2513 { 2514 struct bonding *bond = container_of(work, struct bonding, 2515 arp_work.work); 2516 struct slave *slave, *oldcurrent; 2517 struct list_head *iter; 2518 int do_failover = 0, slave_state_changed = 0; 2519 2520 if (!bond_has_slaves(bond)) 2521 goto re_arm; 2522 2523 rcu_read_lock(); 2524 2525 oldcurrent = rcu_dereference(bond->curr_active_slave); 2526 /* see if any of the previous devices are up now (i.e. they have 2527 * xmt and rcv traffic). the curr_active_slave does not come into 2528 * the picture unless it is null. also, slave->last_link_up is not 2529 * needed here because we send an arp on each slave and give a slave 2530 * as long as it needs to get the tx/rx within the delta. 2531 * TODO: what about up/down delay in arp mode? it wasn't here before 2532 * so it can wait 2533 */ 2534 bond_for_each_slave_rcu(bond, slave, iter) { 2535 unsigned long trans_start = dev_trans_start(slave->dev); 2536 2537 if (slave->link != BOND_LINK_UP) { 2538 if (bond_time_in_interval(bond, trans_start, 1) && 2539 bond_time_in_interval(bond, slave->last_rx, 1)) { 2540 2541 slave->link = BOND_LINK_UP; 2542 slave_state_changed = 1; 2543 2544 /* primary_slave has no meaning in round-robin 2545 * mode. the window of a slave being up and 2546 * curr_active_slave being null after enslaving 2547 * is closed. 2548 */ 2549 if (!oldcurrent) { 2550 netdev_info(bond->dev, "link status definitely up for interface %s\n", 2551 slave->dev->name); 2552 do_failover = 1; 2553 } else { 2554 netdev_info(bond->dev, "interface %s is now up\n", 2555 slave->dev->name); 2556 } 2557 } 2558 } else { 2559 /* slave->link == BOND_LINK_UP */ 2560 2561 /* not all switches will respond to an arp request 2562 * when the source ip is 0, so don't take the link down 2563 * if we don't know our ip yet 2564 */ 2565 if (!bond_time_in_interval(bond, trans_start, 2) || 2566 !bond_time_in_interval(bond, slave->last_rx, 2)) { 2567 2568 slave->link = BOND_LINK_DOWN; 2569 slave_state_changed = 1; 2570 2571 if (slave->link_failure_count < UINT_MAX) 2572 slave->link_failure_count++; 2573 2574 netdev_info(bond->dev, "interface %s is now down\n", 2575 slave->dev->name); 2576 2577 if (slave == oldcurrent) 2578 do_failover = 1; 2579 } 2580 } 2581 2582 /* note: if switch is in round-robin mode, all links 2583 * must tx arp to ensure all links rx an arp - otherwise 2584 * links may oscillate or not come up at all; if switch is 2585 * in something like xor mode, there is nothing we can 2586 * do - all replies will be rx'ed on same link causing slaves 2587 * to be unstable during low/no traffic periods 2588 */ 2589 if (bond_slave_is_up(slave)) 2590 bond_arp_send_all(bond, slave); 2591 } 2592 2593 rcu_read_unlock(); 2594 2595 if (do_failover || slave_state_changed) { 2596 if (!rtnl_trylock()) 2597 goto re_arm; 2598 2599 if (slave_state_changed) { 2600 bond_slave_state_change(bond); 2601 if (BOND_MODE(bond) == BOND_MODE_XOR) 2602 bond_update_slave_arr(bond, NULL); 2603 } 2604 if (do_failover) { 2605 block_netpoll_tx(); 2606 bond_select_active_slave(bond); 2607 unblock_netpoll_tx(); 2608 } 2609 rtnl_unlock(); 2610 } 2611 2612 re_arm: 2613 if (bond->params.arp_interval) 2614 queue_delayed_work(bond->wq, &bond->arp_work, 2615 msecs_to_jiffies(bond->params.arp_interval)); 2616 } 2617 2618 /* Called to inspect slaves for active-backup mode ARP monitor link state 2619 * changes. Sets new_link in slaves to specify what action should take 2620 * place for the slave. Returns 0 if no changes are found, >0 if changes 2621 * to link states must be committed. 2622 * 2623 * Called with rcu_read_lock held. 2624 */ 2625 static int bond_ab_arp_inspect(struct bonding *bond) 2626 { 2627 unsigned long trans_start, last_rx; 2628 struct list_head *iter; 2629 struct slave *slave; 2630 int commit = 0; 2631 2632 bond_for_each_slave_rcu(bond, slave, iter) { 2633 slave->new_link = BOND_LINK_NOCHANGE; 2634 last_rx = slave_last_rx(bond, slave); 2635 2636 if (slave->link != BOND_LINK_UP) { 2637 if (bond_time_in_interval(bond, last_rx, 1)) { 2638 slave->new_link = BOND_LINK_UP; 2639 commit++; 2640 } 2641 continue; 2642 } 2643 2644 /* Give slaves 2*delta after being enslaved or made 2645 * active. This avoids bouncing, as the last receive 2646 * times need a full ARP monitor cycle to be updated. 2647 */ 2648 if (bond_time_in_interval(bond, slave->last_link_up, 2)) 2649 continue; 2650 2651 /* Backup slave is down if: 2652 * - No current_arp_slave AND 2653 * - more than 3*delta since last receive AND 2654 * - the bond has an IP address 2655 * 2656 * Note: a non-null current_arp_slave indicates 2657 * the curr_active_slave went down and we are 2658 * searching for a new one; under this condition 2659 * we only take the curr_active_slave down - this 2660 * gives each slave a chance to tx/rx traffic 2661 * before being taken out 2662 */ 2663 if (!bond_is_active_slave(slave) && 2664 !rcu_access_pointer(bond->current_arp_slave) && 2665 !bond_time_in_interval(bond, last_rx, 3)) { 2666 slave->new_link = BOND_LINK_DOWN; 2667 commit++; 2668 } 2669 2670 /* Active slave is down if: 2671 * - more than 2*delta since transmitting OR 2672 * - (more than 2*delta since receive AND 2673 * the bond has an IP address) 2674 */ 2675 trans_start = dev_trans_start(slave->dev); 2676 if (bond_is_active_slave(slave) && 2677 (!bond_time_in_interval(bond, trans_start, 2) || 2678 !bond_time_in_interval(bond, last_rx, 2))) { 2679 slave->new_link = BOND_LINK_DOWN; 2680 commit++; 2681 } 2682 } 2683 2684 return commit; 2685 } 2686 2687 /* Called to commit link state changes noted by inspection step of 2688 * active-backup mode ARP monitor. 2689 * 2690 * Called with RTNL hold. 2691 */ 2692 static void bond_ab_arp_commit(struct bonding *bond) 2693 { 2694 unsigned long trans_start; 2695 struct list_head *iter; 2696 struct slave *slave; 2697 2698 bond_for_each_slave(bond, slave, iter) { 2699 switch (slave->new_link) { 2700 case BOND_LINK_NOCHANGE: 2701 continue; 2702 2703 case BOND_LINK_UP: 2704 trans_start = dev_trans_start(slave->dev); 2705 if (rtnl_dereference(bond->curr_active_slave) != slave || 2706 (!rtnl_dereference(bond->curr_active_slave) && 2707 bond_time_in_interval(bond, trans_start, 1))) { 2708 struct slave *current_arp_slave; 2709 2710 current_arp_slave = rtnl_dereference(bond->current_arp_slave); 2711 bond_set_slave_link_state(slave, BOND_LINK_UP); 2712 if (current_arp_slave) { 2713 bond_set_slave_inactive_flags( 2714 current_arp_slave, 2715 BOND_SLAVE_NOTIFY_NOW); 2716 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2717 } 2718 2719 netdev_info(bond->dev, "link status definitely up for interface %s\n", 2720 slave->dev->name); 2721 2722 if (!rtnl_dereference(bond->curr_active_slave) || 2723 slave == rtnl_dereference(bond->primary_slave)) 2724 goto do_failover; 2725 2726 } 2727 2728 continue; 2729 2730 case BOND_LINK_DOWN: 2731 if (slave->link_failure_count < UINT_MAX) 2732 slave->link_failure_count++; 2733 2734 bond_set_slave_link_state(slave, BOND_LINK_DOWN); 2735 bond_set_slave_inactive_flags(slave, 2736 BOND_SLAVE_NOTIFY_NOW); 2737 2738 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n", 2739 slave->dev->name); 2740 2741 if (slave == rtnl_dereference(bond->curr_active_slave)) { 2742 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2743 goto do_failover; 2744 } 2745 2746 continue; 2747 2748 default: 2749 netdev_err(bond->dev, "impossible: new_link %d on slave %s\n", 2750 slave->new_link, slave->dev->name); 2751 continue; 2752 } 2753 2754 do_failover: 2755 block_netpoll_tx(); 2756 bond_select_active_slave(bond); 2757 unblock_netpoll_tx(); 2758 } 2759 2760 bond_set_carrier(bond); 2761 } 2762 2763 /* Send ARP probes for active-backup mode ARP monitor. 2764 * 2765 * Called with rcu_read_lock held. 2766 */ 2767 static bool bond_ab_arp_probe(struct bonding *bond) 2768 { 2769 struct slave *slave, *before = NULL, *new_slave = NULL, 2770 *curr_arp_slave = rcu_dereference(bond->current_arp_slave), 2771 *curr_active_slave = rcu_dereference(bond->curr_active_slave); 2772 struct list_head *iter; 2773 bool found = false; 2774 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; 2775 2776 if (curr_arp_slave && curr_active_slave) 2777 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n", 2778 curr_arp_slave->dev->name, 2779 curr_active_slave->dev->name); 2780 2781 if (curr_active_slave) { 2782 bond_arp_send_all(bond, curr_active_slave); 2783 return should_notify_rtnl; 2784 } 2785 2786 /* if we don't have a curr_active_slave, search for the next available 2787 * backup slave from the current_arp_slave and make it the candidate 2788 * for becoming the curr_active_slave 2789 */ 2790 2791 if (!curr_arp_slave) { 2792 curr_arp_slave = bond_first_slave_rcu(bond); 2793 if (!curr_arp_slave) 2794 return should_notify_rtnl; 2795 } 2796 2797 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER); 2798 2799 bond_for_each_slave_rcu(bond, slave, iter) { 2800 if (!found && !before && bond_slave_is_up(slave)) 2801 before = slave; 2802 2803 if (found && !new_slave && bond_slave_is_up(slave)) 2804 new_slave = slave; 2805 /* if the link state is up at this point, we 2806 * mark it down - this can happen if we have 2807 * simultaneous link failures and 2808 * reselect_active_interface doesn't make this 2809 * one the current slave so it is still marked 2810 * up when it is actually down 2811 */ 2812 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 2813 bond_set_slave_link_state(slave, BOND_LINK_DOWN); 2814 if (slave->link_failure_count < UINT_MAX) 2815 slave->link_failure_count++; 2816 2817 bond_set_slave_inactive_flags(slave, 2818 BOND_SLAVE_NOTIFY_LATER); 2819 2820 netdev_info(bond->dev, "backup interface %s is now down\n", 2821 slave->dev->name); 2822 } 2823 if (slave == curr_arp_slave) 2824 found = true; 2825 } 2826 2827 if (!new_slave && before) 2828 new_slave = before; 2829 2830 if (!new_slave) 2831 goto check_state; 2832 2833 bond_set_slave_link_state(new_slave, BOND_LINK_BACK); 2834 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER); 2835 bond_arp_send_all(bond, new_slave); 2836 new_slave->last_link_up = jiffies; 2837 rcu_assign_pointer(bond->current_arp_slave, new_slave); 2838 2839 check_state: 2840 bond_for_each_slave_rcu(bond, slave, iter) { 2841 if (slave->should_notify) { 2842 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; 2843 break; 2844 } 2845 } 2846 return should_notify_rtnl; 2847 } 2848 2849 static void bond_activebackup_arp_mon(struct work_struct *work) 2850 { 2851 struct bonding *bond = container_of(work, struct bonding, 2852 arp_work.work); 2853 bool should_notify_peers = false; 2854 bool should_notify_rtnl = false; 2855 int delta_in_ticks; 2856 2857 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2858 2859 if (!bond_has_slaves(bond)) 2860 goto re_arm; 2861 2862 rcu_read_lock(); 2863 2864 should_notify_peers = bond_should_notify_peers(bond); 2865 2866 if (bond_ab_arp_inspect(bond)) { 2867 rcu_read_unlock(); 2868 2869 /* Race avoidance with bond_close flush of workqueue */ 2870 if (!rtnl_trylock()) { 2871 delta_in_ticks = 1; 2872 should_notify_peers = false; 2873 goto re_arm; 2874 } 2875 2876 bond_ab_arp_commit(bond); 2877 2878 rtnl_unlock(); 2879 rcu_read_lock(); 2880 } 2881 2882 should_notify_rtnl = bond_ab_arp_probe(bond); 2883 rcu_read_unlock(); 2884 2885 re_arm: 2886 if (bond->params.arp_interval) 2887 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 2888 2889 if (should_notify_peers || should_notify_rtnl) { 2890 if (!rtnl_trylock()) 2891 return; 2892 2893 if (should_notify_peers) 2894 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 2895 bond->dev); 2896 if (should_notify_rtnl) 2897 bond_slave_state_notify(bond); 2898 2899 rtnl_unlock(); 2900 } 2901 } 2902 2903 /*-------------------------- netdev event handling --------------------------*/ 2904 2905 /* Change device name */ 2906 static int bond_event_changename(struct bonding *bond) 2907 { 2908 bond_remove_proc_entry(bond); 2909 bond_create_proc_entry(bond); 2910 2911 bond_debug_reregister(bond); 2912 2913 return NOTIFY_DONE; 2914 } 2915 2916 static int bond_master_netdev_event(unsigned long event, 2917 struct net_device *bond_dev) 2918 { 2919 struct bonding *event_bond = netdev_priv(bond_dev); 2920 2921 switch (event) { 2922 case NETDEV_CHANGENAME: 2923 return bond_event_changename(event_bond); 2924 case NETDEV_UNREGISTER: 2925 bond_remove_proc_entry(event_bond); 2926 break; 2927 case NETDEV_REGISTER: 2928 bond_create_proc_entry(event_bond); 2929 break; 2930 case NETDEV_NOTIFY_PEERS: 2931 if (event_bond->send_peer_notif) 2932 event_bond->send_peer_notif--; 2933 break; 2934 default: 2935 break; 2936 } 2937 2938 return NOTIFY_DONE; 2939 } 2940 2941 static int bond_slave_netdev_event(unsigned long event, 2942 struct net_device *slave_dev) 2943 { 2944 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary; 2945 struct bonding *bond; 2946 struct net_device *bond_dev; 2947 u32 old_speed; 2948 u8 old_duplex; 2949 2950 /* A netdev event can be generated while enslaving a device 2951 * before netdev_rx_handler_register is called in which case 2952 * slave will be NULL 2953 */ 2954 if (!slave) 2955 return NOTIFY_DONE; 2956 bond_dev = slave->bond->dev; 2957 bond = slave->bond; 2958 primary = rtnl_dereference(bond->primary_slave); 2959 2960 switch (event) { 2961 case NETDEV_UNREGISTER: 2962 if (bond_dev->type != ARPHRD_ETHER) 2963 bond_release_and_destroy(bond_dev, slave_dev); 2964 else 2965 bond_release(bond_dev, slave_dev); 2966 break; 2967 case NETDEV_UP: 2968 case NETDEV_CHANGE: 2969 old_speed = slave->speed; 2970 old_duplex = slave->duplex; 2971 2972 bond_update_speed_duplex(slave); 2973 2974 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 2975 if (old_speed != slave->speed) 2976 bond_3ad_adapter_speed_changed(slave); 2977 if (old_duplex != slave->duplex) 2978 bond_3ad_adapter_duplex_changed(slave); 2979 } 2980 /* Fallthrough */ 2981 case NETDEV_DOWN: 2982 /* Refresh slave-array if applicable! 2983 * If the setup does not use miimon or arpmon (mode-specific!), 2984 * then these events will not cause the slave-array to be 2985 * refreshed. This will cause xmit to use a slave that is not 2986 * usable. Avoid such situation by refeshing the array at these 2987 * events. If these (miimon/arpmon) parameters are configured 2988 * then array gets refreshed twice and that should be fine! 2989 */ 2990 if (bond_mode_uses_xmit_hash(bond)) 2991 bond_update_slave_arr(bond, NULL); 2992 break; 2993 case NETDEV_CHANGEMTU: 2994 /* TODO: Should slaves be allowed to 2995 * independently alter their MTU? For 2996 * an active-backup bond, slaves need 2997 * not be the same type of device, so 2998 * MTUs may vary. For other modes, 2999 * slaves arguably should have the 3000 * same MTUs. To do this, we'd need to 3001 * take over the slave's change_mtu 3002 * function for the duration of their 3003 * servitude. 3004 */ 3005 break; 3006 case NETDEV_CHANGENAME: 3007 /* we don't care if we don't have primary set */ 3008 if (!bond_uses_primary(bond) || 3009 !bond->params.primary[0]) 3010 break; 3011 3012 if (slave == primary) { 3013 /* slave's name changed - he's no longer primary */ 3014 RCU_INIT_POINTER(bond->primary_slave, NULL); 3015 } else if (!strcmp(slave_dev->name, bond->params.primary)) { 3016 /* we have a new primary slave */ 3017 rcu_assign_pointer(bond->primary_slave, slave); 3018 } else { /* we didn't change primary - exit */ 3019 break; 3020 } 3021 3022 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n", 3023 primary ? slave_dev->name : "none"); 3024 3025 block_netpoll_tx(); 3026 bond_select_active_slave(bond); 3027 unblock_netpoll_tx(); 3028 break; 3029 case NETDEV_FEAT_CHANGE: 3030 bond_compute_features(bond); 3031 break; 3032 case NETDEV_RESEND_IGMP: 3033 /* Propagate to master device */ 3034 call_netdevice_notifiers(event, slave->bond->dev); 3035 break; 3036 default: 3037 break; 3038 } 3039 3040 return NOTIFY_DONE; 3041 } 3042 3043 /* bond_netdev_event: handle netdev notifier chain events. 3044 * 3045 * This function receives events for the netdev chain. The caller (an 3046 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 3047 * locks for us to safely manipulate the slave devices (RTNL lock, 3048 * dev_probe_lock). 3049 */ 3050 static int bond_netdev_event(struct notifier_block *this, 3051 unsigned long event, void *ptr) 3052 { 3053 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 3054 3055 netdev_dbg(event_dev, "event: %lx\n", event); 3056 3057 if (!(event_dev->priv_flags & IFF_BONDING)) 3058 return NOTIFY_DONE; 3059 3060 if (event_dev->flags & IFF_MASTER) { 3061 netdev_dbg(event_dev, "IFF_MASTER\n"); 3062 return bond_master_netdev_event(event, event_dev); 3063 } 3064 3065 if (event_dev->flags & IFF_SLAVE) { 3066 netdev_dbg(event_dev, "IFF_SLAVE\n"); 3067 return bond_slave_netdev_event(event, event_dev); 3068 } 3069 3070 return NOTIFY_DONE; 3071 } 3072 3073 static struct notifier_block bond_netdev_notifier = { 3074 .notifier_call = bond_netdev_event, 3075 }; 3076 3077 /*---------------------------- Hashing Policies -----------------------------*/ 3078 3079 /* L2 hash helper */ 3080 static inline u32 bond_eth_hash(struct sk_buff *skb) 3081 { 3082 struct ethhdr *ep, hdr_tmp; 3083 3084 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp); 3085 if (ep) 3086 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto; 3087 return 0; 3088 } 3089 3090 /* Extract the appropriate headers based on bond's xmit policy */ 3091 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, 3092 struct flow_keys *fk) 3093 { 3094 const struct ipv6hdr *iph6; 3095 const struct iphdr *iph; 3096 int noff, proto = -1; 3097 3098 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23) 3099 return skb_flow_dissect_flow_keys(skb, fk); 3100 3101 fk->ports.ports = 0; 3102 noff = skb_network_offset(skb); 3103 if (skb->protocol == htons(ETH_P_IP)) { 3104 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph)))) 3105 return false; 3106 iph = ip_hdr(skb); 3107 iph_to_flow_copy_v4addrs(fk, iph); 3108 noff += iph->ihl << 2; 3109 if (!ip_is_fragment(iph)) 3110 proto = iph->protocol; 3111 } else if (skb->protocol == htons(ETH_P_IPV6)) { 3112 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6)))) 3113 return false; 3114 iph6 = ipv6_hdr(skb); 3115 iph_to_flow_copy_v6addrs(fk, iph6); 3116 noff += sizeof(*iph6); 3117 proto = iph6->nexthdr; 3118 } else { 3119 return false; 3120 } 3121 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0) 3122 fk->ports.ports = skb_flow_get_ports(skb, noff, proto); 3123 3124 return true; 3125 } 3126 3127 /** 3128 * bond_xmit_hash - generate a hash value based on the xmit policy 3129 * @bond: bonding device 3130 * @skb: buffer to use for headers 3131 * 3132 * This function will extract the necessary headers from the skb buffer and use 3133 * them to generate a hash based on the xmit_policy set in the bonding device 3134 */ 3135 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb) 3136 { 3137 struct flow_keys flow; 3138 u32 hash; 3139 3140 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 || 3141 !bond_flow_dissect(bond, skb, &flow)) 3142 return bond_eth_hash(skb); 3143 3144 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 || 3145 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) 3146 hash = bond_eth_hash(skb); 3147 else 3148 hash = (__force u32)flow.ports.ports; 3149 hash ^= (__force u32)flow_get_u32_dst(&flow) ^ 3150 (__force u32)flow_get_u32_src(&flow); 3151 hash ^= (hash >> 16); 3152 hash ^= (hash >> 8); 3153 3154 return hash; 3155 } 3156 3157 /*-------------------------- Device entry points ----------------------------*/ 3158 3159 static void bond_work_init_all(struct bonding *bond) 3160 { 3161 INIT_DELAYED_WORK(&bond->mcast_work, 3162 bond_resend_igmp_join_requests_delayed); 3163 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 3164 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 3165 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3166 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon); 3167 else 3168 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon); 3169 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 3170 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler); 3171 } 3172 3173 static void bond_work_cancel_all(struct bonding *bond) 3174 { 3175 cancel_delayed_work_sync(&bond->mii_work); 3176 cancel_delayed_work_sync(&bond->arp_work); 3177 cancel_delayed_work_sync(&bond->alb_work); 3178 cancel_delayed_work_sync(&bond->ad_work); 3179 cancel_delayed_work_sync(&bond->mcast_work); 3180 cancel_delayed_work_sync(&bond->slave_arr_work); 3181 } 3182 3183 static int bond_open(struct net_device *bond_dev) 3184 { 3185 struct bonding *bond = netdev_priv(bond_dev); 3186 struct list_head *iter; 3187 struct slave *slave; 3188 3189 /* reset slave->backup and slave->inactive */ 3190 if (bond_has_slaves(bond)) { 3191 bond_for_each_slave(bond, slave, iter) { 3192 if (bond_uses_primary(bond) && 3193 slave != rcu_access_pointer(bond->curr_active_slave)) { 3194 bond_set_slave_inactive_flags(slave, 3195 BOND_SLAVE_NOTIFY_NOW); 3196 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) { 3197 bond_set_slave_active_flags(slave, 3198 BOND_SLAVE_NOTIFY_NOW); 3199 } 3200 } 3201 } 3202 3203 bond_work_init_all(bond); 3204 3205 if (bond_is_lb(bond)) { 3206 /* bond_alb_initialize must be called before the timer 3207 * is started. 3208 */ 3209 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB))) 3210 return -ENOMEM; 3211 if (bond->params.tlb_dynamic_lb) 3212 queue_delayed_work(bond->wq, &bond->alb_work, 0); 3213 } 3214 3215 if (bond->params.miimon) /* link check interval, in milliseconds. */ 3216 queue_delayed_work(bond->wq, &bond->mii_work, 0); 3217 3218 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 3219 queue_delayed_work(bond->wq, &bond->arp_work, 0); 3220 bond->recv_probe = bond_arp_rcv; 3221 } 3222 3223 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3224 queue_delayed_work(bond->wq, &bond->ad_work, 0); 3225 /* register to receive LACPDUs */ 3226 bond->recv_probe = bond_3ad_lacpdu_recv; 3227 bond_3ad_initiate_agg_selection(bond, 1); 3228 } 3229 3230 if (bond_mode_uses_xmit_hash(bond)) 3231 bond_update_slave_arr(bond, NULL); 3232 3233 return 0; 3234 } 3235 3236 static int bond_close(struct net_device *bond_dev) 3237 { 3238 struct bonding *bond = netdev_priv(bond_dev); 3239 3240 bond_work_cancel_all(bond); 3241 bond->send_peer_notif = 0; 3242 if (bond_is_lb(bond)) 3243 bond_alb_deinitialize(bond); 3244 bond->recv_probe = NULL; 3245 3246 return 0; 3247 } 3248 3249 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev, 3250 struct rtnl_link_stats64 *stats) 3251 { 3252 struct bonding *bond = netdev_priv(bond_dev); 3253 struct rtnl_link_stats64 temp; 3254 struct list_head *iter; 3255 struct slave *slave; 3256 3257 memcpy(stats, &bond->bond_stats, sizeof(*stats)); 3258 3259 bond_for_each_slave(bond, slave, iter) { 3260 const struct rtnl_link_stats64 *sstats = 3261 dev_get_stats(slave->dev, &temp); 3262 struct rtnl_link_stats64 *pstats = &slave->slave_stats; 3263 3264 stats->rx_packets += sstats->rx_packets - pstats->rx_packets; 3265 stats->rx_bytes += sstats->rx_bytes - pstats->rx_bytes; 3266 stats->rx_errors += sstats->rx_errors - pstats->rx_errors; 3267 stats->rx_dropped += sstats->rx_dropped - pstats->rx_dropped; 3268 3269 stats->tx_packets += sstats->tx_packets - pstats->tx_packets;; 3270 stats->tx_bytes += sstats->tx_bytes - pstats->tx_bytes; 3271 stats->tx_errors += sstats->tx_errors - pstats->tx_errors; 3272 stats->tx_dropped += sstats->tx_dropped - pstats->tx_dropped; 3273 3274 stats->multicast += sstats->multicast - pstats->multicast; 3275 stats->collisions += sstats->collisions - pstats->collisions; 3276 3277 stats->rx_length_errors += sstats->rx_length_errors - pstats->rx_length_errors; 3278 stats->rx_over_errors += sstats->rx_over_errors - pstats->rx_over_errors; 3279 stats->rx_crc_errors += sstats->rx_crc_errors - pstats->rx_crc_errors; 3280 stats->rx_frame_errors += sstats->rx_frame_errors - pstats->rx_frame_errors; 3281 stats->rx_fifo_errors += sstats->rx_fifo_errors - pstats->rx_fifo_errors; 3282 stats->rx_missed_errors += sstats->rx_missed_errors - pstats->rx_missed_errors; 3283 3284 stats->tx_aborted_errors += sstats->tx_aborted_errors - pstats->tx_aborted_errors; 3285 stats->tx_carrier_errors += sstats->tx_carrier_errors - pstats->tx_carrier_errors; 3286 stats->tx_fifo_errors += sstats->tx_fifo_errors - pstats->tx_fifo_errors; 3287 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors - pstats->tx_heartbeat_errors; 3288 stats->tx_window_errors += sstats->tx_window_errors - pstats->tx_window_errors; 3289 3290 /* save off the slave stats for the next run */ 3291 memcpy(pstats, sstats, sizeof(*sstats)); 3292 } 3293 memcpy(&bond->bond_stats, stats, sizeof(*stats)); 3294 3295 return stats; 3296 } 3297 3298 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 3299 { 3300 struct bonding *bond = netdev_priv(bond_dev); 3301 struct net_device *slave_dev = NULL; 3302 struct ifbond k_binfo; 3303 struct ifbond __user *u_binfo = NULL; 3304 struct ifslave k_sinfo; 3305 struct ifslave __user *u_sinfo = NULL; 3306 struct mii_ioctl_data *mii = NULL; 3307 struct bond_opt_value newval; 3308 struct net *net; 3309 int res = 0; 3310 3311 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd); 3312 3313 switch (cmd) { 3314 case SIOCGMIIPHY: 3315 mii = if_mii(ifr); 3316 if (!mii) 3317 return -EINVAL; 3318 3319 mii->phy_id = 0; 3320 /* Fall Through */ 3321 case SIOCGMIIREG: 3322 /* We do this again just in case we were called by SIOCGMIIREG 3323 * instead of SIOCGMIIPHY. 3324 */ 3325 mii = if_mii(ifr); 3326 if (!mii) 3327 return -EINVAL; 3328 3329 if (mii->reg_num == 1) { 3330 mii->val_out = 0; 3331 if (netif_carrier_ok(bond->dev)) 3332 mii->val_out = BMSR_LSTATUS; 3333 } 3334 3335 return 0; 3336 case BOND_INFO_QUERY_OLD: 3337 case SIOCBONDINFOQUERY: 3338 u_binfo = (struct ifbond __user *)ifr->ifr_data; 3339 3340 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 3341 return -EFAULT; 3342 3343 res = bond_info_query(bond_dev, &k_binfo); 3344 if (res == 0 && 3345 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 3346 return -EFAULT; 3347 3348 return res; 3349 case BOND_SLAVE_INFO_QUERY_OLD: 3350 case SIOCBONDSLAVEINFOQUERY: 3351 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 3352 3353 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 3354 return -EFAULT; 3355 3356 res = bond_slave_info_query(bond_dev, &k_sinfo); 3357 if (res == 0 && 3358 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 3359 return -EFAULT; 3360 3361 return res; 3362 default: 3363 break; 3364 } 3365 3366 net = dev_net(bond_dev); 3367 3368 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3369 return -EPERM; 3370 3371 slave_dev = __dev_get_by_name(net, ifr->ifr_slave); 3372 3373 netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev); 3374 3375 if (!slave_dev) 3376 return -ENODEV; 3377 3378 netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name); 3379 switch (cmd) { 3380 case BOND_ENSLAVE_OLD: 3381 case SIOCBONDENSLAVE: 3382 res = bond_enslave(bond_dev, slave_dev); 3383 break; 3384 case BOND_RELEASE_OLD: 3385 case SIOCBONDRELEASE: 3386 res = bond_release(bond_dev, slave_dev); 3387 break; 3388 case BOND_SETHWADDR_OLD: 3389 case SIOCBONDSETHWADDR: 3390 bond_set_dev_addr(bond_dev, slave_dev); 3391 res = 0; 3392 break; 3393 case BOND_CHANGE_ACTIVE_OLD: 3394 case SIOCBONDCHANGEACTIVE: 3395 bond_opt_initstr(&newval, slave_dev->name); 3396 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval); 3397 break; 3398 default: 3399 res = -EOPNOTSUPP; 3400 } 3401 3402 return res; 3403 } 3404 3405 static void bond_change_rx_flags(struct net_device *bond_dev, int change) 3406 { 3407 struct bonding *bond = netdev_priv(bond_dev); 3408 3409 if (change & IFF_PROMISC) 3410 bond_set_promiscuity(bond, 3411 bond_dev->flags & IFF_PROMISC ? 1 : -1); 3412 3413 if (change & IFF_ALLMULTI) 3414 bond_set_allmulti(bond, 3415 bond_dev->flags & IFF_ALLMULTI ? 1 : -1); 3416 } 3417 3418 static void bond_set_rx_mode(struct net_device *bond_dev) 3419 { 3420 struct bonding *bond = netdev_priv(bond_dev); 3421 struct list_head *iter; 3422 struct slave *slave; 3423 3424 rcu_read_lock(); 3425 if (bond_uses_primary(bond)) { 3426 slave = rcu_dereference(bond->curr_active_slave); 3427 if (slave) { 3428 dev_uc_sync(slave->dev, bond_dev); 3429 dev_mc_sync(slave->dev, bond_dev); 3430 } 3431 } else { 3432 bond_for_each_slave_rcu(bond, slave, iter) { 3433 dev_uc_sync_multiple(slave->dev, bond_dev); 3434 dev_mc_sync_multiple(slave->dev, bond_dev); 3435 } 3436 } 3437 rcu_read_unlock(); 3438 } 3439 3440 static int bond_neigh_init(struct neighbour *n) 3441 { 3442 struct bonding *bond = netdev_priv(n->dev); 3443 const struct net_device_ops *slave_ops; 3444 struct neigh_parms parms; 3445 struct slave *slave; 3446 int ret; 3447 3448 slave = bond_first_slave(bond); 3449 if (!slave) 3450 return 0; 3451 slave_ops = slave->dev->netdev_ops; 3452 if (!slave_ops->ndo_neigh_setup) 3453 return 0; 3454 3455 parms.neigh_setup = NULL; 3456 parms.neigh_cleanup = NULL; 3457 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); 3458 if (ret) 3459 return ret; 3460 3461 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called 3462 * after the last slave has been detached. Assumes that all slaves 3463 * utilize the same neigh_cleanup (true at this writing as only user 3464 * is ipoib). 3465 */ 3466 n->parms->neigh_cleanup = parms.neigh_cleanup; 3467 3468 if (!parms.neigh_setup) 3469 return 0; 3470 3471 return parms.neigh_setup(n); 3472 } 3473 3474 /* The bonding ndo_neigh_setup is called at init time beofre any 3475 * slave exists. So we must declare proxy setup function which will 3476 * be used at run time to resolve the actual slave neigh param setup. 3477 * 3478 * It's also called by master devices (such as vlans) to setup their 3479 * underlying devices. In that case - do nothing, we're already set up from 3480 * our init. 3481 */ 3482 static int bond_neigh_setup(struct net_device *dev, 3483 struct neigh_parms *parms) 3484 { 3485 /* modify only our neigh_parms */ 3486 if (parms->dev == dev) 3487 parms->neigh_setup = bond_neigh_init; 3488 3489 return 0; 3490 } 3491 3492 /* Change the MTU of all of a master's slaves to match the master */ 3493 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 3494 { 3495 struct bonding *bond = netdev_priv(bond_dev); 3496 struct slave *slave, *rollback_slave; 3497 struct list_head *iter; 3498 int res = 0; 3499 3500 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu); 3501 3502 bond_for_each_slave(bond, slave, iter) { 3503 netdev_dbg(bond_dev, "s %p c_m %p\n", 3504 slave, slave->dev->netdev_ops->ndo_change_mtu); 3505 3506 res = dev_set_mtu(slave->dev, new_mtu); 3507 3508 if (res) { 3509 /* If we failed to set the slave's mtu to the new value 3510 * we must abort the operation even in ACTIVE_BACKUP 3511 * mode, because if we allow the backup slaves to have 3512 * different mtu values than the active slave we'll 3513 * need to change their mtu when doing a failover. That 3514 * means changing their mtu from timer context, which 3515 * is probably not a good idea. 3516 */ 3517 netdev_dbg(bond_dev, "err %d %s\n", res, 3518 slave->dev->name); 3519 goto unwind; 3520 } 3521 } 3522 3523 bond_dev->mtu = new_mtu; 3524 3525 return 0; 3526 3527 unwind: 3528 /* unwind from head to the slave that failed */ 3529 bond_for_each_slave(bond, rollback_slave, iter) { 3530 int tmp_res; 3531 3532 if (rollback_slave == slave) 3533 break; 3534 3535 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu); 3536 if (tmp_res) { 3537 netdev_dbg(bond_dev, "unwind err %d dev %s\n", 3538 tmp_res, rollback_slave->dev->name); 3539 } 3540 } 3541 3542 return res; 3543 } 3544 3545 /* Change HW address 3546 * 3547 * Note that many devices must be down to change the HW address, and 3548 * downing the master releases all slaves. We can make bonds full of 3549 * bonding devices to test this, however. 3550 */ 3551 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 3552 { 3553 struct bonding *bond = netdev_priv(bond_dev); 3554 struct slave *slave, *rollback_slave; 3555 struct sockaddr *sa = addr, tmp_sa; 3556 struct list_head *iter; 3557 int res = 0; 3558 3559 if (BOND_MODE(bond) == BOND_MODE_ALB) 3560 return bond_alb_set_mac_address(bond_dev, addr); 3561 3562 3563 netdev_dbg(bond_dev, "bond=%p\n", bond); 3564 3565 /* If fail_over_mac is enabled, do nothing and return success. 3566 * Returning an error causes ifenslave to fail. 3567 */ 3568 if (bond->params.fail_over_mac && 3569 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3570 return 0; 3571 3572 if (!is_valid_ether_addr(sa->sa_data)) 3573 return -EADDRNOTAVAIL; 3574 3575 bond_for_each_slave(bond, slave, iter) { 3576 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name); 3577 res = dev_set_mac_address(slave->dev, addr); 3578 if (res) { 3579 /* TODO: consider downing the slave 3580 * and retry ? 3581 * User should expect communications 3582 * breakage anyway until ARP finish 3583 * updating, so... 3584 */ 3585 netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name); 3586 goto unwind; 3587 } 3588 } 3589 3590 /* success */ 3591 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); 3592 return 0; 3593 3594 unwind: 3595 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 3596 tmp_sa.sa_family = bond_dev->type; 3597 3598 /* unwind from head to the slave that failed */ 3599 bond_for_each_slave(bond, rollback_slave, iter) { 3600 int tmp_res; 3601 3602 if (rollback_slave == slave) 3603 break; 3604 3605 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa); 3606 if (tmp_res) { 3607 netdev_dbg(bond_dev, "unwind err %d dev %s\n", 3608 tmp_res, rollback_slave->dev->name); 3609 } 3610 } 3611 3612 return res; 3613 } 3614 3615 /** 3616 * bond_xmit_slave_id - transmit skb through slave with slave_id 3617 * @bond: bonding device that is transmitting 3618 * @skb: buffer to transmit 3619 * @slave_id: slave id up to slave_cnt-1 through which to transmit 3620 * 3621 * This function tries to transmit through slave with slave_id but in case 3622 * it fails, it tries to find the first available slave for transmission. 3623 * The skb is consumed in all cases, thus the function is void. 3624 */ 3625 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id) 3626 { 3627 struct list_head *iter; 3628 struct slave *slave; 3629 int i = slave_id; 3630 3631 /* Here we start from the slave with slave_id */ 3632 bond_for_each_slave_rcu(bond, slave, iter) { 3633 if (--i < 0) { 3634 if (bond_slave_can_tx(slave)) { 3635 bond_dev_queue_xmit(bond, skb, slave->dev); 3636 return; 3637 } 3638 } 3639 } 3640 3641 /* Here we start from the first slave up to slave_id */ 3642 i = slave_id; 3643 bond_for_each_slave_rcu(bond, slave, iter) { 3644 if (--i < 0) 3645 break; 3646 if (bond_slave_can_tx(slave)) { 3647 bond_dev_queue_xmit(bond, skb, slave->dev); 3648 return; 3649 } 3650 } 3651 /* no slave that can tx has been found */ 3652 bond_tx_drop(bond->dev, skb); 3653 } 3654 3655 /** 3656 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave 3657 * @bond: bonding device to use 3658 * 3659 * Based on the value of the bonding device's packets_per_slave parameter 3660 * this function generates a slave id, which is usually used as the next 3661 * slave to transmit through. 3662 */ 3663 static u32 bond_rr_gen_slave_id(struct bonding *bond) 3664 { 3665 u32 slave_id; 3666 struct reciprocal_value reciprocal_packets_per_slave; 3667 int packets_per_slave = bond->params.packets_per_slave; 3668 3669 switch (packets_per_slave) { 3670 case 0: 3671 slave_id = prandom_u32(); 3672 break; 3673 case 1: 3674 slave_id = bond->rr_tx_counter; 3675 break; 3676 default: 3677 reciprocal_packets_per_slave = 3678 bond->params.reciprocal_packets_per_slave; 3679 slave_id = reciprocal_divide(bond->rr_tx_counter, 3680 reciprocal_packets_per_slave); 3681 break; 3682 } 3683 bond->rr_tx_counter++; 3684 3685 return slave_id; 3686 } 3687 3688 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev) 3689 { 3690 struct bonding *bond = netdev_priv(bond_dev); 3691 struct iphdr *iph = ip_hdr(skb); 3692 struct slave *slave; 3693 u32 slave_id; 3694 3695 /* Start with the curr_active_slave that joined the bond as the 3696 * default for sending IGMP traffic. For failover purposes one 3697 * needs to maintain some consistency for the interface that will 3698 * send the join/membership reports. The curr_active_slave found 3699 * will send all of this type of traffic. 3700 */ 3701 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) { 3702 slave = rcu_dereference(bond->curr_active_slave); 3703 if (slave) 3704 bond_dev_queue_xmit(bond, skb, slave->dev); 3705 else 3706 bond_xmit_slave_id(bond, skb, 0); 3707 } else { 3708 int slave_cnt = ACCESS_ONCE(bond->slave_cnt); 3709 3710 if (likely(slave_cnt)) { 3711 slave_id = bond_rr_gen_slave_id(bond); 3712 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt); 3713 } else { 3714 bond_tx_drop(bond_dev, skb); 3715 } 3716 } 3717 3718 return NETDEV_TX_OK; 3719 } 3720 3721 /* In active-backup mode, we know that bond->curr_active_slave is always valid if 3722 * the bond has a usable interface. 3723 */ 3724 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev) 3725 { 3726 struct bonding *bond = netdev_priv(bond_dev); 3727 struct slave *slave; 3728 3729 slave = rcu_dereference(bond->curr_active_slave); 3730 if (slave) 3731 bond_dev_queue_xmit(bond, skb, slave->dev); 3732 else 3733 bond_tx_drop(bond_dev, skb); 3734 3735 return NETDEV_TX_OK; 3736 } 3737 3738 /* Use this to update slave_array when (a) it's not appropriate to update 3739 * slave_array right away (note that update_slave_array() may sleep) 3740 * and / or (b) RTNL is not held. 3741 */ 3742 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay) 3743 { 3744 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay); 3745 } 3746 3747 /* Slave array work handler. Holds only RTNL */ 3748 static void bond_slave_arr_handler(struct work_struct *work) 3749 { 3750 struct bonding *bond = container_of(work, struct bonding, 3751 slave_arr_work.work); 3752 int ret; 3753 3754 if (!rtnl_trylock()) 3755 goto err; 3756 3757 ret = bond_update_slave_arr(bond, NULL); 3758 rtnl_unlock(); 3759 if (ret) { 3760 pr_warn_ratelimited("Failed to update slave array from WT\n"); 3761 goto err; 3762 } 3763 return; 3764 3765 err: 3766 bond_slave_arr_work_rearm(bond, 1); 3767 } 3768 3769 /* Build the usable slaves array in control path for modes that use xmit-hash 3770 * to determine the slave interface - 3771 * (a) BOND_MODE_8023AD 3772 * (b) BOND_MODE_XOR 3773 * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0 3774 * 3775 * The caller is expected to hold RTNL only and NO other lock! 3776 */ 3777 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave) 3778 { 3779 struct slave *slave; 3780 struct list_head *iter; 3781 struct bond_up_slave *new_arr, *old_arr; 3782 int slaves_in_agg; 3783 int agg_id = 0; 3784 int ret = 0; 3785 3786 #ifdef CONFIG_LOCKDEP 3787 WARN_ON(lockdep_is_held(&bond->mode_lock)); 3788 #endif 3789 3790 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]), 3791 GFP_KERNEL); 3792 if (!new_arr) { 3793 ret = -ENOMEM; 3794 pr_err("Failed to build slave-array.\n"); 3795 goto out; 3796 } 3797 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3798 struct ad_info ad_info; 3799 3800 if (bond_3ad_get_active_agg_info(bond, &ad_info)) { 3801 pr_debug("bond_3ad_get_active_agg_info failed\n"); 3802 kfree_rcu(new_arr, rcu); 3803 /* No active aggragator means it's not safe to use 3804 * the previous array. 3805 */ 3806 old_arr = rtnl_dereference(bond->slave_arr); 3807 if (old_arr) { 3808 RCU_INIT_POINTER(bond->slave_arr, NULL); 3809 kfree_rcu(old_arr, rcu); 3810 } 3811 goto out; 3812 } 3813 slaves_in_agg = ad_info.ports; 3814 agg_id = ad_info.aggregator_id; 3815 } 3816 bond_for_each_slave(bond, slave, iter) { 3817 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3818 struct aggregator *agg; 3819 3820 agg = SLAVE_AD_INFO(slave)->port.aggregator; 3821 if (!agg || agg->aggregator_identifier != agg_id) 3822 continue; 3823 } 3824 if (!bond_slave_can_tx(slave)) 3825 continue; 3826 if (skipslave == slave) 3827 continue; 3828 new_arr->arr[new_arr->count++] = slave; 3829 } 3830 3831 old_arr = rtnl_dereference(bond->slave_arr); 3832 rcu_assign_pointer(bond->slave_arr, new_arr); 3833 if (old_arr) 3834 kfree_rcu(old_arr, rcu); 3835 out: 3836 if (ret != 0 && skipslave) { 3837 int idx; 3838 3839 /* Rare situation where caller has asked to skip a specific 3840 * slave but allocation failed (most likely!). BTW this is 3841 * only possible when the call is initiated from 3842 * __bond_release_one(). In this situation; overwrite the 3843 * skipslave entry in the array with the last entry from the 3844 * array to avoid a situation where the xmit path may choose 3845 * this to-be-skipped slave to send a packet out. 3846 */ 3847 old_arr = rtnl_dereference(bond->slave_arr); 3848 for (idx = 0; idx < old_arr->count; idx++) { 3849 if (skipslave == old_arr->arr[idx]) { 3850 old_arr->arr[idx] = 3851 old_arr->arr[old_arr->count-1]; 3852 old_arr->count--; 3853 break; 3854 } 3855 } 3856 } 3857 return ret; 3858 } 3859 3860 /* Use this Xmit function for 3AD as well as XOR modes. The current 3861 * usable slave array is formed in the control path. The xmit function 3862 * just calculates hash and sends the packet out. 3863 */ 3864 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev) 3865 { 3866 struct bonding *bond = netdev_priv(dev); 3867 struct slave *slave; 3868 struct bond_up_slave *slaves; 3869 unsigned int count; 3870 3871 slaves = rcu_dereference(bond->slave_arr); 3872 count = slaves ? ACCESS_ONCE(slaves->count) : 0; 3873 if (likely(count)) { 3874 slave = slaves->arr[bond_xmit_hash(bond, skb) % count]; 3875 bond_dev_queue_xmit(bond, skb, slave->dev); 3876 } else { 3877 bond_tx_drop(dev, skb); 3878 } 3879 3880 return NETDEV_TX_OK; 3881 } 3882 3883 /* in broadcast mode, we send everything to all usable interfaces. */ 3884 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev) 3885 { 3886 struct bonding *bond = netdev_priv(bond_dev); 3887 struct slave *slave = NULL; 3888 struct list_head *iter; 3889 3890 bond_for_each_slave_rcu(bond, slave, iter) { 3891 if (bond_is_last_slave(bond, slave)) 3892 break; 3893 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 3894 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 3895 3896 if (!skb2) { 3897 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n", 3898 bond_dev->name, __func__); 3899 continue; 3900 } 3901 bond_dev_queue_xmit(bond, skb2, slave->dev); 3902 } 3903 } 3904 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) 3905 bond_dev_queue_xmit(bond, skb, slave->dev); 3906 else 3907 bond_tx_drop(bond_dev, skb); 3908 3909 return NETDEV_TX_OK; 3910 } 3911 3912 /*------------------------- Device initialization ---------------------------*/ 3913 3914 /* Lookup the slave that corresponds to a qid */ 3915 static inline int bond_slave_override(struct bonding *bond, 3916 struct sk_buff *skb) 3917 { 3918 struct slave *slave = NULL; 3919 struct list_head *iter; 3920 3921 if (!skb->queue_mapping) 3922 return 1; 3923 3924 /* Find out if any slaves have the same mapping as this skb. */ 3925 bond_for_each_slave_rcu(bond, slave, iter) { 3926 if (slave->queue_id == skb->queue_mapping) { 3927 if (bond_slave_is_up(slave) && 3928 slave->link == BOND_LINK_UP) { 3929 bond_dev_queue_xmit(bond, skb, slave->dev); 3930 return 0; 3931 } 3932 /* If the slave isn't UP, use default transmit policy. */ 3933 break; 3934 } 3935 } 3936 3937 return 1; 3938 } 3939 3940 3941 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb, 3942 void *accel_priv, select_queue_fallback_t fallback) 3943 { 3944 /* This helper function exists to help dev_pick_tx get the correct 3945 * destination queue. Using a helper function skips a call to 3946 * skb_tx_hash and will put the skbs in the queue we expect on their 3947 * way down to the bonding driver. 3948 */ 3949 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 3950 3951 /* Save the original txq to restore before passing to the driver */ 3952 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping; 3953 3954 if (unlikely(txq >= dev->real_num_tx_queues)) { 3955 do { 3956 txq -= dev->real_num_tx_queues; 3957 } while (txq >= dev->real_num_tx_queues); 3958 } 3959 return txq; 3960 } 3961 3962 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 3963 { 3964 struct bonding *bond = netdev_priv(dev); 3965 3966 if (bond_should_override_tx_queue(bond) && 3967 !bond_slave_override(bond, skb)) 3968 return NETDEV_TX_OK; 3969 3970 switch (BOND_MODE(bond)) { 3971 case BOND_MODE_ROUNDROBIN: 3972 return bond_xmit_roundrobin(skb, dev); 3973 case BOND_MODE_ACTIVEBACKUP: 3974 return bond_xmit_activebackup(skb, dev); 3975 case BOND_MODE_8023AD: 3976 case BOND_MODE_XOR: 3977 return bond_3ad_xor_xmit(skb, dev); 3978 case BOND_MODE_BROADCAST: 3979 return bond_xmit_broadcast(skb, dev); 3980 case BOND_MODE_ALB: 3981 return bond_alb_xmit(skb, dev); 3982 case BOND_MODE_TLB: 3983 return bond_tlb_xmit(skb, dev); 3984 default: 3985 /* Should never happen, mode already checked */ 3986 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond)); 3987 WARN_ON_ONCE(1); 3988 bond_tx_drop(dev, skb); 3989 return NETDEV_TX_OK; 3990 } 3991 } 3992 3993 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 3994 { 3995 struct bonding *bond = netdev_priv(dev); 3996 netdev_tx_t ret = NETDEV_TX_OK; 3997 3998 /* If we risk deadlock from transmitting this in the 3999 * netpoll path, tell netpoll to queue the frame for later tx 4000 */ 4001 if (unlikely(is_netpoll_tx_blocked(dev))) 4002 return NETDEV_TX_BUSY; 4003 4004 rcu_read_lock(); 4005 if (bond_has_slaves(bond)) 4006 ret = __bond_start_xmit(skb, dev); 4007 else 4008 bond_tx_drop(dev, skb); 4009 rcu_read_unlock(); 4010 4011 return ret; 4012 } 4013 4014 static int bond_ethtool_get_settings(struct net_device *bond_dev, 4015 struct ethtool_cmd *ecmd) 4016 { 4017 struct bonding *bond = netdev_priv(bond_dev); 4018 unsigned long speed = 0; 4019 struct list_head *iter; 4020 struct slave *slave; 4021 4022 ecmd->duplex = DUPLEX_UNKNOWN; 4023 ecmd->port = PORT_OTHER; 4024 4025 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we 4026 * do not need to check mode. Though link speed might not represent 4027 * the true receive or transmit bandwidth (not all modes are symmetric) 4028 * this is an accurate maximum. 4029 */ 4030 bond_for_each_slave(bond, slave, iter) { 4031 if (bond_slave_can_tx(slave)) { 4032 if (slave->speed != SPEED_UNKNOWN) 4033 speed += slave->speed; 4034 if (ecmd->duplex == DUPLEX_UNKNOWN && 4035 slave->duplex != DUPLEX_UNKNOWN) 4036 ecmd->duplex = slave->duplex; 4037 } 4038 } 4039 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN); 4040 4041 return 0; 4042 } 4043 4044 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 4045 struct ethtool_drvinfo *drvinfo) 4046 { 4047 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver)); 4048 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version)); 4049 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d", 4050 BOND_ABI_VERSION); 4051 } 4052 4053 static const struct ethtool_ops bond_ethtool_ops = { 4054 .get_drvinfo = bond_ethtool_get_drvinfo, 4055 .get_settings = bond_ethtool_get_settings, 4056 .get_link = ethtool_op_get_link, 4057 }; 4058 4059 static const struct net_device_ops bond_netdev_ops = { 4060 .ndo_init = bond_init, 4061 .ndo_uninit = bond_uninit, 4062 .ndo_open = bond_open, 4063 .ndo_stop = bond_close, 4064 .ndo_start_xmit = bond_start_xmit, 4065 .ndo_select_queue = bond_select_queue, 4066 .ndo_get_stats64 = bond_get_stats, 4067 .ndo_do_ioctl = bond_do_ioctl, 4068 .ndo_change_rx_flags = bond_change_rx_flags, 4069 .ndo_set_rx_mode = bond_set_rx_mode, 4070 .ndo_change_mtu = bond_change_mtu, 4071 .ndo_set_mac_address = bond_set_mac_address, 4072 .ndo_neigh_setup = bond_neigh_setup, 4073 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 4074 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 4075 #ifdef CONFIG_NET_POLL_CONTROLLER 4076 .ndo_netpoll_setup = bond_netpoll_setup, 4077 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 4078 .ndo_poll_controller = bond_poll_controller, 4079 #endif 4080 .ndo_add_slave = bond_enslave, 4081 .ndo_del_slave = bond_release, 4082 .ndo_fix_features = bond_fix_features, 4083 .ndo_bridge_setlink = switchdev_port_bridge_setlink, 4084 .ndo_bridge_getlink = switchdev_port_bridge_getlink, 4085 .ndo_bridge_dellink = switchdev_port_bridge_dellink, 4086 .ndo_fdb_add = switchdev_port_fdb_add, 4087 .ndo_fdb_del = switchdev_port_fdb_del, 4088 .ndo_fdb_dump = switchdev_port_fdb_dump, 4089 .ndo_features_check = passthru_features_check, 4090 }; 4091 4092 static const struct device_type bond_type = { 4093 .name = "bond", 4094 }; 4095 4096 static void bond_destructor(struct net_device *bond_dev) 4097 { 4098 struct bonding *bond = netdev_priv(bond_dev); 4099 if (bond->wq) 4100 destroy_workqueue(bond->wq); 4101 free_netdev(bond_dev); 4102 } 4103 4104 void bond_setup(struct net_device *bond_dev) 4105 { 4106 struct bonding *bond = netdev_priv(bond_dev); 4107 4108 spin_lock_init(&bond->mode_lock); 4109 bond->params = bonding_defaults; 4110 4111 /* Initialize pointers */ 4112 bond->dev = bond_dev; 4113 4114 /* Initialize the device entry points */ 4115 ether_setup(bond_dev); 4116 bond_dev->netdev_ops = &bond_netdev_ops; 4117 bond_dev->ethtool_ops = &bond_ethtool_ops; 4118 4119 bond_dev->destructor = bond_destructor; 4120 4121 SET_NETDEV_DEVTYPE(bond_dev, &bond_type); 4122 4123 /* Initialize the device options */ 4124 bond_dev->tx_queue_len = 0; 4125 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST; 4126 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT; 4127 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 4128 4129 /* don't acquire bond device's netif_tx_lock when transmitting */ 4130 bond_dev->features |= NETIF_F_LLTX; 4131 4132 /* By default, we declare the bond to be fully 4133 * VLAN hardware accelerated capable. Special 4134 * care is taken in the various xmit functions 4135 * when there are slaves that are not hw accel 4136 * capable 4137 */ 4138 4139 /* Don't allow bond devices to change network namespaces. */ 4140 bond_dev->features |= NETIF_F_NETNS_LOCAL; 4141 4142 bond_dev->hw_features = BOND_VLAN_FEATURES | 4143 NETIF_F_HW_VLAN_CTAG_TX | 4144 NETIF_F_HW_VLAN_CTAG_RX | 4145 NETIF_F_HW_VLAN_CTAG_FILTER; 4146 4147 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM); 4148 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL; 4149 bond_dev->features |= bond_dev->hw_features; 4150 } 4151 4152 /* Destroy a bonding device. 4153 * Must be under rtnl_lock when this function is called. 4154 */ 4155 static void bond_uninit(struct net_device *bond_dev) 4156 { 4157 struct bonding *bond = netdev_priv(bond_dev); 4158 struct list_head *iter; 4159 struct slave *slave; 4160 struct bond_up_slave *arr; 4161 4162 bond_netpoll_cleanup(bond_dev); 4163 4164 /* Release the bonded slaves */ 4165 bond_for_each_slave(bond, slave, iter) 4166 __bond_release_one(bond_dev, slave->dev, true); 4167 netdev_info(bond_dev, "Released all slaves\n"); 4168 4169 arr = rtnl_dereference(bond->slave_arr); 4170 if (arr) { 4171 RCU_INIT_POINTER(bond->slave_arr, NULL); 4172 kfree_rcu(arr, rcu); 4173 } 4174 4175 list_del(&bond->bond_list); 4176 4177 bond_debug_unregister(bond); 4178 } 4179 4180 /*------------------------- Module initialization ---------------------------*/ 4181 4182 static int bond_check_params(struct bond_params *params) 4183 { 4184 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i; 4185 struct bond_opt_value newval; 4186 const struct bond_opt_value *valptr; 4187 int arp_all_targets_value; 4188 u16 ad_actor_sys_prio = 0; 4189 u16 ad_user_port_key = 0; 4190 4191 /* Convert string parameters. */ 4192 if (mode) { 4193 bond_opt_initstr(&newval, mode); 4194 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval); 4195 if (!valptr) { 4196 pr_err("Error: Invalid bonding mode \"%s\"\n", mode); 4197 return -EINVAL; 4198 } 4199 bond_mode = valptr->value; 4200 } 4201 4202 if (xmit_hash_policy) { 4203 if ((bond_mode != BOND_MODE_XOR) && 4204 (bond_mode != BOND_MODE_8023AD) && 4205 (bond_mode != BOND_MODE_TLB)) { 4206 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 4207 bond_mode_name(bond_mode)); 4208 } else { 4209 bond_opt_initstr(&newval, xmit_hash_policy); 4210 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH), 4211 &newval); 4212 if (!valptr) { 4213 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 4214 xmit_hash_policy); 4215 return -EINVAL; 4216 } 4217 xmit_hashtype = valptr->value; 4218 } 4219 } 4220 4221 if (lacp_rate) { 4222 if (bond_mode != BOND_MODE_8023AD) { 4223 pr_info("lacp_rate param is irrelevant in mode %s\n", 4224 bond_mode_name(bond_mode)); 4225 } else { 4226 bond_opt_initstr(&newval, lacp_rate); 4227 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE), 4228 &newval); 4229 if (!valptr) { 4230 pr_err("Error: Invalid lacp rate \"%s\"\n", 4231 lacp_rate); 4232 return -EINVAL; 4233 } 4234 lacp_fast = valptr->value; 4235 } 4236 } 4237 4238 if (ad_select) { 4239 bond_opt_initstr(&newval, ad_select); 4240 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT), 4241 &newval); 4242 if (!valptr) { 4243 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select); 4244 return -EINVAL; 4245 } 4246 params->ad_select = valptr->value; 4247 if (bond_mode != BOND_MODE_8023AD) 4248 pr_warn("ad_select param only affects 802.3ad mode\n"); 4249 } else { 4250 params->ad_select = BOND_AD_STABLE; 4251 } 4252 4253 if (max_bonds < 0) { 4254 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 4255 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 4256 max_bonds = BOND_DEFAULT_MAX_BONDS; 4257 } 4258 4259 if (miimon < 0) { 4260 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4261 miimon, INT_MAX); 4262 miimon = 0; 4263 } 4264 4265 if (updelay < 0) { 4266 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4267 updelay, INT_MAX); 4268 updelay = 0; 4269 } 4270 4271 if (downdelay < 0) { 4272 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4273 downdelay, INT_MAX); 4274 downdelay = 0; 4275 } 4276 4277 if ((use_carrier != 0) && (use_carrier != 1)) { 4278 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 4279 use_carrier); 4280 use_carrier = 1; 4281 } 4282 4283 if (num_peer_notif < 0 || num_peer_notif > 255) { 4284 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 4285 num_peer_notif); 4286 num_peer_notif = 1; 4287 } 4288 4289 /* reset values for 802.3ad/TLB/ALB */ 4290 if (!bond_mode_uses_arp(bond_mode)) { 4291 if (!miimon) { 4292 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"); 4293 pr_warn("Forcing miimon to 100msec\n"); 4294 miimon = BOND_DEFAULT_MIIMON; 4295 } 4296 } 4297 4298 if (tx_queues < 1 || tx_queues > 255) { 4299 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n", 4300 tx_queues, BOND_DEFAULT_TX_QUEUES); 4301 tx_queues = BOND_DEFAULT_TX_QUEUES; 4302 } 4303 4304 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 4305 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n", 4306 all_slaves_active); 4307 all_slaves_active = 0; 4308 } 4309 4310 if (resend_igmp < 0 || resend_igmp > 255) { 4311 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n", 4312 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 4313 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 4314 } 4315 4316 bond_opt_initval(&newval, packets_per_slave); 4317 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) { 4318 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n", 4319 packets_per_slave, USHRT_MAX); 4320 packets_per_slave = 1; 4321 } 4322 4323 if (bond_mode == BOND_MODE_ALB) { 4324 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", 4325 updelay); 4326 } 4327 4328 if (!miimon) { 4329 if (updelay || downdelay) { 4330 /* just warn the user the up/down delay will have 4331 * no effect since miimon is zero... 4332 */ 4333 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", 4334 updelay, downdelay); 4335 } 4336 } else { 4337 /* don't allow arp monitoring */ 4338 if (arp_interval) { 4339 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 4340 miimon, arp_interval); 4341 arp_interval = 0; 4342 } 4343 4344 if ((updelay % miimon) != 0) { 4345 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 4346 updelay, miimon, (updelay / miimon) * miimon); 4347 } 4348 4349 updelay /= miimon; 4350 4351 if ((downdelay % miimon) != 0) { 4352 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 4353 downdelay, miimon, 4354 (downdelay / miimon) * miimon); 4355 } 4356 4357 downdelay /= miimon; 4358 } 4359 4360 if (arp_interval < 0) { 4361 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4362 arp_interval, INT_MAX); 4363 arp_interval = 0; 4364 } 4365 4366 for (arp_ip_count = 0, i = 0; 4367 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) { 4368 __be32 ip; 4369 4370 /* not a complete check, but good enough to catch mistakes */ 4371 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) || 4372 !bond_is_ip_target_ok(ip)) { 4373 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 4374 arp_ip_target[i]); 4375 arp_interval = 0; 4376 } else { 4377 if (bond_get_targets_ip(arp_target, ip) == -1) 4378 arp_target[arp_ip_count++] = ip; 4379 else 4380 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n", 4381 &ip); 4382 } 4383 } 4384 4385 if (arp_interval && !arp_ip_count) { 4386 /* don't allow arping if no arp_ip_target given... */ 4387 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 4388 arp_interval); 4389 arp_interval = 0; 4390 } 4391 4392 if (arp_validate) { 4393 if (!arp_interval) { 4394 pr_err("arp_validate requires arp_interval\n"); 4395 return -EINVAL; 4396 } 4397 4398 bond_opt_initstr(&newval, arp_validate); 4399 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE), 4400 &newval); 4401 if (!valptr) { 4402 pr_err("Error: invalid arp_validate \"%s\"\n", 4403 arp_validate); 4404 return -EINVAL; 4405 } 4406 arp_validate_value = valptr->value; 4407 } else { 4408 arp_validate_value = 0; 4409 } 4410 4411 arp_all_targets_value = 0; 4412 if (arp_all_targets) { 4413 bond_opt_initstr(&newval, arp_all_targets); 4414 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS), 4415 &newval); 4416 if (!valptr) { 4417 pr_err("Error: invalid arp_all_targets_value \"%s\"\n", 4418 arp_all_targets); 4419 arp_all_targets_value = 0; 4420 } else { 4421 arp_all_targets_value = valptr->value; 4422 } 4423 } 4424 4425 if (miimon) { 4426 pr_info("MII link monitoring set to %d ms\n", miimon); 4427 } else if (arp_interval) { 4428 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE, 4429 arp_validate_value); 4430 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 4431 arp_interval, valptr->string, arp_ip_count); 4432 4433 for (i = 0; i < arp_ip_count; i++) 4434 pr_cont(" %s", arp_ip_target[i]); 4435 4436 pr_cont("\n"); 4437 4438 } else if (max_bonds) { 4439 /* miimon and arp_interval not set, we need one so things 4440 * work as expected, see bonding.txt for details 4441 */ 4442 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"); 4443 } 4444 4445 if (primary && !bond_mode_uses_primary(bond_mode)) { 4446 /* currently, using a primary only makes sense 4447 * in active backup, TLB or ALB modes 4448 */ 4449 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n", 4450 primary, bond_mode_name(bond_mode)); 4451 primary = NULL; 4452 } 4453 4454 if (primary && primary_reselect) { 4455 bond_opt_initstr(&newval, primary_reselect); 4456 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT), 4457 &newval); 4458 if (!valptr) { 4459 pr_err("Error: Invalid primary_reselect \"%s\"\n", 4460 primary_reselect); 4461 return -EINVAL; 4462 } 4463 primary_reselect_value = valptr->value; 4464 } else { 4465 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 4466 } 4467 4468 if (fail_over_mac) { 4469 bond_opt_initstr(&newval, fail_over_mac); 4470 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC), 4471 &newval); 4472 if (!valptr) { 4473 pr_err("Error: invalid fail_over_mac \"%s\"\n", 4474 fail_over_mac); 4475 return -EINVAL; 4476 } 4477 fail_over_mac_value = valptr->value; 4478 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 4479 pr_warn("Warning: fail_over_mac only affects active-backup mode\n"); 4480 } else { 4481 fail_over_mac_value = BOND_FOM_NONE; 4482 } 4483 4484 bond_opt_initstr(&newval, "default"); 4485 valptr = bond_opt_parse( 4486 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO), 4487 &newval); 4488 if (!valptr) { 4489 pr_err("Error: No ad_actor_sys_prio default value"); 4490 return -EINVAL; 4491 } 4492 ad_actor_sys_prio = valptr->value; 4493 4494 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY), 4495 &newval); 4496 if (!valptr) { 4497 pr_err("Error: No ad_user_port_key default value"); 4498 return -EINVAL; 4499 } 4500 ad_user_port_key = valptr->value; 4501 4502 if (lp_interval == 0) { 4503 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n", 4504 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL); 4505 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 4506 } 4507 4508 /* fill params struct with the proper values */ 4509 params->mode = bond_mode; 4510 params->xmit_policy = xmit_hashtype; 4511 params->miimon = miimon; 4512 params->num_peer_notif = num_peer_notif; 4513 params->arp_interval = arp_interval; 4514 params->arp_validate = arp_validate_value; 4515 params->arp_all_targets = arp_all_targets_value; 4516 params->updelay = updelay; 4517 params->downdelay = downdelay; 4518 params->use_carrier = use_carrier; 4519 params->lacp_fast = lacp_fast; 4520 params->primary[0] = 0; 4521 params->primary_reselect = primary_reselect_value; 4522 params->fail_over_mac = fail_over_mac_value; 4523 params->tx_queues = tx_queues; 4524 params->all_slaves_active = all_slaves_active; 4525 params->resend_igmp = resend_igmp; 4526 params->min_links = min_links; 4527 params->lp_interval = lp_interval; 4528 params->packets_per_slave = packets_per_slave; 4529 params->tlb_dynamic_lb = 1; /* Default value */ 4530 params->ad_actor_sys_prio = ad_actor_sys_prio; 4531 eth_zero_addr(params->ad_actor_system); 4532 params->ad_user_port_key = ad_user_port_key; 4533 if (packets_per_slave > 0) { 4534 params->reciprocal_packets_per_slave = 4535 reciprocal_value(packets_per_slave); 4536 } else { 4537 /* reciprocal_packets_per_slave is unused if 4538 * packets_per_slave is 0 or 1, just initialize it 4539 */ 4540 params->reciprocal_packets_per_slave = 4541 (struct reciprocal_value) { 0 }; 4542 } 4543 4544 if (primary) { 4545 strncpy(params->primary, primary, IFNAMSIZ); 4546 params->primary[IFNAMSIZ - 1] = 0; 4547 } 4548 4549 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 4550 4551 return 0; 4552 } 4553 4554 static struct lock_class_key bonding_netdev_xmit_lock_key; 4555 static struct lock_class_key bonding_netdev_addr_lock_key; 4556 static struct lock_class_key bonding_tx_busylock_key; 4557 4558 static void bond_set_lockdep_class_one(struct net_device *dev, 4559 struct netdev_queue *txq, 4560 void *_unused) 4561 { 4562 lockdep_set_class(&txq->_xmit_lock, 4563 &bonding_netdev_xmit_lock_key); 4564 } 4565 4566 static void bond_set_lockdep_class(struct net_device *dev) 4567 { 4568 lockdep_set_class(&dev->addr_list_lock, 4569 &bonding_netdev_addr_lock_key); 4570 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL); 4571 dev->qdisc_tx_busylock = &bonding_tx_busylock_key; 4572 } 4573 4574 /* Called from registration process */ 4575 static int bond_init(struct net_device *bond_dev) 4576 { 4577 struct bonding *bond = netdev_priv(bond_dev); 4578 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 4579 4580 netdev_dbg(bond_dev, "Begin bond_init\n"); 4581 4582 bond->wq = create_singlethread_workqueue(bond_dev->name); 4583 if (!bond->wq) 4584 return -ENOMEM; 4585 4586 bond_set_lockdep_class(bond_dev); 4587 4588 list_add_tail(&bond->bond_list, &bn->dev_list); 4589 4590 bond_prepare_sysfs_group(bond); 4591 4592 bond_debug_register(bond); 4593 4594 /* Ensure valid dev_addr */ 4595 if (is_zero_ether_addr(bond_dev->dev_addr) && 4596 bond_dev->addr_assign_type == NET_ADDR_PERM) 4597 eth_hw_addr_random(bond_dev); 4598 4599 return 0; 4600 } 4601 4602 unsigned int bond_get_num_tx_queues(void) 4603 { 4604 return tx_queues; 4605 } 4606 4607 /* Create a new bond based on the specified name and bonding parameters. 4608 * If name is NULL, obtain a suitable "bond%d" name for us. 4609 * Caller must NOT hold rtnl_lock; we need to release it here before we 4610 * set up our sysfs entries. 4611 */ 4612 int bond_create(struct net *net, const char *name) 4613 { 4614 struct net_device *bond_dev; 4615 struct bonding *bond; 4616 struct alb_bond_info *bond_info; 4617 int res; 4618 4619 rtnl_lock(); 4620 4621 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 4622 name ? name : "bond%d", NET_NAME_UNKNOWN, 4623 bond_setup, tx_queues); 4624 if (!bond_dev) { 4625 pr_err("%s: eek! can't alloc netdev!\n", name); 4626 rtnl_unlock(); 4627 return -ENOMEM; 4628 } 4629 4630 /* 4631 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX. 4632 * It is set to 0 by default which is wrong. 4633 */ 4634 bond = netdev_priv(bond_dev); 4635 bond_info = &(BOND_ALB_INFO(bond)); 4636 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; 4637 4638 dev_net_set(bond_dev, net); 4639 bond_dev->rtnl_link_ops = &bond_link_ops; 4640 4641 res = register_netdevice(bond_dev); 4642 4643 netif_carrier_off(bond_dev); 4644 4645 rtnl_unlock(); 4646 if (res < 0) 4647 bond_destructor(bond_dev); 4648 return res; 4649 } 4650 4651 static int __net_init bond_net_init(struct net *net) 4652 { 4653 struct bond_net *bn = net_generic(net, bond_net_id); 4654 4655 bn->net = net; 4656 INIT_LIST_HEAD(&bn->dev_list); 4657 4658 bond_create_proc_dir(bn); 4659 bond_create_sysfs(bn); 4660 4661 return 0; 4662 } 4663 4664 static void __net_exit bond_net_exit(struct net *net) 4665 { 4666 struct bond_net *bn = net_generic(net, bond_net_id); 4667 struct bonding *bond, *tmp_bond; 4668 LIST_HEAD(list); 4669 4670 bond_destroy_sysfs(bn); 4671 4672 /* Kill off any bonds created after unregistering bond rtnl ops */ 4673 rtnl_lock(); 4674 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list) 4675 unregister_netdevice_queue(bond->dev, &list); 4676 unregister_netdevice_many(&list); 4677 rtnl_unlock(); 4678 4679 bond_destroy_proc_dir(bn); 4680 } 4681 4682 static struct pernet_operations bond_net_ops = { 4683 .init = bond_net_init, 4684 .exit = bond_net_exit, 4685 .id = &bond_net_id, 4686 .size = sizeof(struct bond_net), 4687 }; 4688 4689 static int __init bonding_init(void) 4690 { 4691 int i; 4692 int res; 4693 4694 pr_info("%s", bond_version); 4695 4696 res = bond_check_params(&bonding_defaults); 4697 if (res) 4698 goto out; 4699 4700 res = register_pernet_subsys(&bond_net_ops); 4701 if (res) 4702 goto out; 4703 4704 res = bond_netlink_init(); 4705 if (res) 4706 goto err_link; 4707 4708 bond_create_debugfs(); 4709 4710 for (i = 0; i < max_bonds; i++) { 4711 res = bond_create(&init_net, NULL); 4712 if (res) 4713 goto err; 4714 } 4715 4716 register_netdevice_notifier(&bond_netdev_notifier); 4717 out: 4718 return res; 4719 err: 4720 bond_destroy_debugfs(); 4721 bond_netlink_fini(); 4722 err_link: 4723 unregister_pernet_subsys(&bond_net_ops); 4724 goto out; 4725 4726 } 4727 4728 static void __exit bonding_exit(void) 4729 { 4730 unregister_netdevice_notifier(&bond_netdev_notifier); 4731 4732 bond_destroy_debugfs(); 4733 4734 bond_netlink_fini(); 4735 unregister_pernet_subsys(&bond_net_ops); 4736 4737 #ifdef CONFIG_NET_POLL_CONTROLLER 4738 /* Make sure we don't have an imbalance on our netpoll blocking */ 4739 WARN_ON(atomic_read(&netpoll_block_tx)); 4740 #endif 4741 } 4742 4743 module_init(bonding_init); 4744 module_exit(bonding_exit); 4745 MODULE_LICENSE("GPL"); 4746 MODULE_VERSION(DRV_VERSION); 4747 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION); 4748 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 4749