1 /* 2 * originally based on the dummy device. 3 * 4 * Copyright 1999, Thomas Davis, tadavis@lbl.gov. 5 * Licensed under the GPL. Based on dummy.c, and eql.c devices. 6 * 7 * bonding.c: an Ethernet Bonding driver 8 * 9 * This is useful to talk to a Cisco EtherChannel compatible equipment: 10 * Cisco 5500 11 * Sun Trunking (Solaris) 12 * Alteon AceDirector Trunks 13 * Linux Bonding 14 * and probably many L2 switches ... 15 * 16 * How it works: 17 * ifconfig bond0 ipaddress netmask up 18 * will setup a network device, with an ip address. No mac address 19 * will be assigned at this time. The hw mac address will come from 20 * the first slave bonded to the channel. All slaves will then use 21 * this hw mac address. 22 * 23 * ifconfig bond0 down 24 * will release all slaves, marking them as down. 25 * 26 * ifenslave bond0 eth0 27 * will attach eth0 to bond0 as a slave. eth0 hw mac address will either 28 * a: be used as initial mac address 29 * b: if a hw mac address already is there, eth0's hw mac address 30 * will then be set from bond0. 31 * 32 */ 33 34 #include <linux/kernel.h> 35 #include <linux/module.h> 36 #include <linux/types.h> 37 #include <linux/fcntl.h> 38 #include <linux/interrupt.h> 39 #include <linux/ptrace.h> 40 #include <linux/ioport.h> 41 #include <linux/in.h> 42 #include <net/ip.h> 43 #include <linux/ip.h> 44 #include <linux/tcp.h> 45 #include <linux/udp.h> 46 #include <linux/slab.h> 47 #include <linux/string.h> 48 #include <linux/init.h> 49 #include <linux/timer.h> 50 #include <linux/socket.h> 51 #include <linux/ctype.h> 52 #include <linux/inet.h> 53 #include <linux/bitops.h> 54 #include <linux/io.h> 55 #include <asm/dma.h> 56 #include <linux/uaccess.h> 57 #include <linux/errno.h> 58 #include <linux/netdevice.h> 59 #include <linux/inetdevice.h> 60 #include <linux/igmp.h> 61 #include <linux/etherdevice.h> 62 #include <linux/skbuff.h> 63 #include <net/sock.h> 64 #include <linux/rtnetlink.h> 65 #include <linux/smp.h> 66 #include <linux/if_ether.h> 67 #include <net/arp.h> 68 #include <linux/mii.h> 69 #include <linux/ethtool.h> 70 #include <linux/if_vlan.h> 71 #include <linux/if_bonding.h> 72 #include <linux/jiffies.h> 73 #include <linux/preempt.h> 74 #include <net/route.h> 75 #include <net/net_namespace.h> 76 #include <net/netns/generic.h> 77 #include <net/pkt_sched.h> 78 #include <linux/rculist.h> 79 #include <net/flow_dissector.h> 80 #include <net/switchdev.h> 81 #include <net/bonding.h> 82 #include <net/bond_3ad.h> 83 #include <net/bond_alb.h> 84 85 #include "bonding_priv.h" 86 87 /*---------------------------- Module parameters ----------------------------*/ 88 89 /* monitor all links that often (in milliseconds). <=0 disables monitoring */ 90 91 static int max_bonds = BOND_DEFAULT_MAX_BONDS; 92 static int tx_queues = BOND_DEFAULT_TX_QUEUES; 93 static int num_peer_notif = 1; 94 static int miimon; 95 static int updelay; 96 static int downdelay; 97 static int use_carrier = 1; 98 static char *mode; 99 static char *primary; 100 static char *primary_reselect; 101 static char *lacp_rate; 102 static int min_links; 103 static char *ad_select; 104 static char *xmit_hash_policy; 105 static int arp_interval; 106 static char *arp_ip_target[BOND_MAX_ARP_TARGETS]; 107 static char *arp_validate; 108 static char *arp_all_targets; 109 static char *fail_over_mac; 110 static int all_slaves_active; 111 static struct bond_params bonding_defaults; 112 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP; 113 static int packets_per_slave = 1; 114 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 115 116 module_param(max_bonds, int, 0); 117 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices"); 118 module_param(tx_queues, int, 0); 119 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)"); 120 module_param_named(num_grat_arp, num_peer_notif, int, 0644); 121 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on " 122 "failover event (alias of num_unsol_na)"); 123 module_param_named(num_unsol_na, num_peer_notif, int, 0644); 124 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on " 125 "failover event (alias of num_grat_arp)"); 126 module_param(miimon, int, 0); 127 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds"); 128 module_param(updelay, int, 0); 129 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds"); 130 module_param(downdelay, int, 0); 131 MODULE_PARM_DESC(downdelay, "Delay before considering link down, " 132 "in milliseconds"); 133 module_param(use_carrier, int, 0); 134 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; " 135 "0 for off, 1 for on (default)"); 136 module_param(mode, charp, 0); 137 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, " 138 "1 for active-backup, 2 for balance-xor, " 139 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, " 140 "6 for balance-alb"); 141 module_param(primary, charp, 0); 142 MODULE_PARM_DESC(primary, "Primary network device to use"); 143 module_param(primary_reselect, charp, 0); 144 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave " 145 "once it comes up; " 146 "0 for always (default), " 147 "1 for only if speed of primary is " 148 "better, " 149 "2 for only on active slave " 150 "failure"); 151 module_param(lacp_rate, charp, 0); 152 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; " 153 "0 for slow, 1 for fast"); 154 module_param(ad_select, charp, 0); 155 MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; " 156 "0 for stable (default), 1 for bandwidth, " 157 "2 for count"); 158 module_param(min_links, int, 0); 159 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier"); 160 161 module_param(xmit_hash_policy, charp, 0); 162 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; " 163 "0 for layer 2 (default), 1 for layer 3+4, " 164 "2 for layer 2+3, 3 for encap layer 2+3, " 165 "4 for encap layer 3+4"); 166 module_param(arp_interval, int, 0); 167 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds"); 168 module_param_array(arp_ip_target, charp, NULL, 0); 169 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form"); 170 module_param(arp_validate, charp, 0); 171 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; " 172 "0 for none (default), 1 for active, " 173 "2 for backup, 3 for all"); 174 module_param(arp_all_targets, charp, 0); 175 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all"); 176 module_param(fail_over_mac, charp, 0); 177 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to " 178 "the same MAC; 0 for none (default), " 179 "1 for active, 2 for follow"); 180 module_param(all_slaves_active, int, 0); 181 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface " 182 "by setting active flag for all slaves; " 183 "0 for never (default), 1 for always."); 184 module_param(resend_igmp, int, 0); 185 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on " 186 "link failure"); 187 module_param(packets_per_slave, int, 0); 188 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr " 189 "mode; 0 for a random slave, 1 packet per " 190 "slave (default), >1 packets per slave."); 191 module_param(lp_interval, uint, 0); 192 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where " 193 "the bonding driver sends learning packets to " 194 "each slaves peer switch. The default is 1."); 195 196 /*----------------------------- Global variables ----------------------------*/ 197 198 #ifdef CONFIG_NET_POLL_CONTROLLER 199 atomic_t netpoll_block_tx = ATOMIC_INIT(0); 200 #endif 201 202 unsigned int bond_net_id __read_mostly; 203 204 /*-------------------------- Forward declarations ---------------------------*/ 205 206 static int bond_init(struct net_device *bond_dev); 207 static void bond_uninit(struct net_device *bond_dev); 208 static void bond_get_stats(struct net_device *bond_dev, 209 struct rtnl_link_stats64 *stats); 210 static void bond_slave_arr_handler(struct work_struct *work); 211 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 212 int mod); 213 214 /*---------------------------- General routines -----------------------------*/ 215 216 const char *bond_mode_name(int mode) 217 { 218 static const char *names[] = { 219 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)", 220 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)", 221 [BOND_MODE_XOR] = "load balancing (xor)", 222 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)", 223 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation", 224 [BOND_MODE_TLB] = "transmit load balancing", 225 [BOND_MODE_ALB] = "adaptive load balancing", 226 }; 227 228 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB) 229 return "unknown"; 230 231 return names[mode]; 232 } 233 234 /*---------------------------------- VLAN -----------------------------------*/ 235 236 /** 237 * bond_dev_queue_xmit - Prepare skb for xmit. 238 * 239 * @bond: bond device that got this skb for tx. 240 * @skb: hw accel VLAN tagged skb to transmit 241 * @slave_dev: slave that is supposed to xmit this skbuff 242 */ 243 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, 244 struct net_device *slave_dev) 245 { 246 skb->dev = slave_dev; 247 248 BUILD_BUG_ON(sizeof(skb->queue_mapping) != 249 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping)); 250 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping; 251 252 if (unlikely(netpoll_tx_running(bond->dev))) 253 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb); 254 else 255 dev_queue_xmit(skb); 256 } 257 258 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid, 259 * We don't protect the slave list iteration with a lock because: 260 * a. This operation is performed in IOCTL context, 261 * b. The operation is protected by the RTNL semaphore in the 8021q code, 262 * c. Holding a lock with BH disabled while directly calling a base driver 263 * entry point is generally a BAD idea. 264 * 265 * The design of synchronization/protection for this operation in the 8021q 266 * module is good for one or more VLAN devices over a single physical device 267 * and cannot be extended for a teaming solution like bonding, so there is a 268 * potential race condition here where a net device from the vlan group might 269 * be referenced (either by a base driver or the 8021q code) while it is being 270 * removed from the system. However, it turns out we're not making matters 271 * worse, and if it works for regular VLAN usage it will work here too. 272 */ 273 274 /** 275 * bond_vlan_rx_add_vid - Propagates adding an id to slaves 276 * @bond_dev: bonding net device that got called 277 * @vid: vlan id being added 278 */ 279 static int bond_vlan_rx_add_vid(struct net_device *bond_dev, 280 __be16 proto, u16 vid) 281 { 282 struct bonding *bond = netdev_priv(bond_dev); 283 struct slave *slave, *rollback_slave; 284 struct list_head *iter; 285 int res; 286 287 bond_for_each_slave(bond, slave, iter) { 288 res = vlan_vid_add(slave->dev, proto, vid); 289 if (res) 290 goto unwind; 291 } 292 293 return 0; 294 295 unwind: 296 /* unwind to the slave that failed */ 297 bond_for_each_slave(bond, rollback_slave, iter) { 298 if (rollback_slave == slave) 299 break; 300 301 vlan_vid_del(rollback_slave->dev, proto, vid); 302 } 303 304 return res; 305 } 306 307 /** 308 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves 309 * @bond_dev: bonding net device that got called 310 * @vid: vlan id being removed 311 */ 312 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, 313 __be16 proto, u16 vid) 314 { 315 struct bonding *bond = netdev_priv(bond_dev); 316 struct list_head *iter; 317 struct slave *slave; 318 319 bond_for_each_slave(bond, slave, iter) 320 vlan_vid_del(slave->dev, proto, vid); 321 322 if (bond_is_lb(bond)) 323 bond_alb_clear_vlan(bond, vid); 324 325 return 0; 326 } 327 328 /*------------------------------- Link status -------------------------------*/ 329 330 /* Set the carrier state for the master according to the state of its 331 * slaves. If any slaves are up, the master is up. In 802.3ad mode, 332 * do special 802.3ad magic. 333 * 334 * Returns zero if carrier state does not change, nonzero if it does. 335 */ 336 int bond_set_carrier(struct bonding *bond) 337 { 338 struct list_head *iter; 339 struct slave *slave; 340 341 if (!bond_has_slaves(bond)) 342 goto down; 343 344 if (BOND_MODE(bond) == BOND_MODE_8023AD) 345 return bond_3ad_set_carrier(bond); 346 347 bond_for_each_slave(bond, slave, iter) { 348 if (slave->link == BOND_LINK_UP) { 349 if (!netif_carrier_ok(bond->dev)) { 350 netif_carrier_on(bond->dev); 351 return 1; 352 } 353 return 0; 354 } 355 } 356 357 down: 358 if (netif_carrier_ok(bond->dev)) { 359 netif_carrier_off(bond->dev); 360 return 1; 361 } 362 return 0; 363 } 364 365 /* Get link speed and duplex from the slave's base driver 366 * using ethtool. If for some reason the call fails or the 367 * values are invalid, set speed and duplex to -1, 368 * and return. Return 1 if speed or duplex settings are 369 * UNKNOWN; 0 otherwise. 370 */ 371 static int bond_update_speed_duplex(struct slave *slave) 372 { 373 struct net_device *slave_dev = slave->dev; 374 struct ethtool_link_ksettings ecmd; 375 int res; 376 377 slave->speed = SPEED_UNKNOWN; 378 slave->duplex = DUPLEX_UNKNOWN; 379 380 res = __ethtool_get_link_ksettings(slave_dev, &ecmd); 381 if (res < 0) 382 return 1; 383 if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1)) 384 return 1; 385 switch (ecmd.base.duplex) { 386 case DUPLEX_FULL: 387 case DUPLEX_HALF: 388 break; 389 default: 390 return 1; 391 } 392 393 slave->speed = ecmd.base.speed; 394 slave->duplex = ecmd.base.duplex; 395 396 return 0; 397 } 398 399 const char *bond_slave_link_status(s8 link) 400 { 401 switch (link) { 402 case BOND_LINK_UP: 403 return "up"; 404 case BOND_LINK_FAIL: 405 return "going down"; 406 case BOND_LINK_DOWN: 407 return "down"; 408 case BOND_LINK_BACK: 409 return "going back"; 410 default: 411 return "unknown"; 412 } 413 } 414 415 /* if <dev> supports MII link status reporting, check its link status. 416 * 417 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), 418 * depending upon the setting of the use_carrier parameter. 419 * 420 * Return either BMSR_LSTATUS, meaning that the link is up (or we 421 * can't tell and just pretend it is), or 0, meaning that the link is 422 * down. 423 * 424 * If reporting is non-zero, instead of faking link up, return -1 if 425 * both ETHTOOL and MII ioctls fail (meaning the device does not 426 * support them). If use_carrier is set, return whatever it says. 427 * It'd be nice if there was a good way to tell if a driver supports 428 * netif_carrier, but there really isn't. 429 */ 430 static int bond_check_dev_link(struct bonding *bond, 431 struct net_device *slave_dev, int reporting) 432 { 433 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 434 int (*ioctl)(struct net_device *, struct ifreq *, int); 435 struct ifreq ifr; 436 struct mii_ioctl_data *mii; 437 438 if (!reporting && !netif_running(slave_dev)) 439 return 0; 440 441 if (bond->params.use_carrier) 442 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; 443 444 /* Try to get link status using Ethtool first. */ 445 if (slave_dev->ethtool_ops->get_link) 446 return slave_dev->ethtool_ops->get_link(slave_dev) ? 447 BMSR_LSTATUS : 0; 448 449 /* Ethtool can't be used, fallback to MII ioctls. */ 450 ioctl = slave_ops->ndo_do_ioctl; 451 if (ioctl) { 452 /* TODO: set pointer to correct ioctl on a per team member 453 * bases to make this more efficient. that is, once 454 * we determine the correct ioctl, we will always 455 * call it and not the others for that team 456 * member. 457 */ 458 459 /* We cannot assume that SIOCGMIIPHY will also read a 460 * register; not all network drivers (e.g., e100) 461 * support that. 462 */ 463 464 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ 465 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ); 466 mii = if_mii(&ifr); 467 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) { 468 mii->reg_num = MII_BMSR; 469 if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0) 470 return mii->val_out & BMSR_LSTATUS; 471 } 472 } 473 474 /* If reporting, report that either there's no dev->do_ioctl, 475 * or both SIOCGMIIREG and get_link failed (meaning that we 476 * cannot report link status). If not reporting, pretend 477 * we're ok. 478 */ 479 return reporting ? -1 : BMSR_LSTATUS; 480 } 481 482 /*----------------------------- Multicast list ------------------------------*/ 483 484 /* Push the promiscuity flag down to appropriate slaves */ 485 static int bond_set_promiscuity(struct bonding *bond, int inc) 486 { 487 struct list_head *iter; 488 int err = 0; 489 490 if (bond_uses_primary(bond)) { 491 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 492 493 if (curr_active) 494 err = dev_set_promiscuity(curr_active->dev, inc); 495 } else { 496 struct slave *slave; 497 498 bond_for_each_slave(bond, slave, iter) { 499 err = dev_set_promiscuity(slave->dev, inc); 500 if (err) 501 return err; 502 } 503 } 504 return err; 505 } 506 507 /* Push the allmulti flag down to all slaves */ 508 static int bond_set_allmulti(struct bonding *bond, int inc) 509 { 510 struct list_head *iter; 511 int err = 0; 512 513 if (bond_uses_primary(bond)) { 514 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 515 516 if (curr_active) 517 err = dev_set_allmulti(curr_active->dev, inc); 518 } else { 519 struct slave *slave; 520 521 bond_for_each_slave(bond, slave, iter) { 522 err = dev_set_allmulti(slave->dev, inc); 523 if (err) 524 return err; 525 } 526 } 527 return err; 528 } 529 530 /* Retrieve the list of registered multicast addresses for the bonding 531 * device and retransmit an IGMP JOIN request to the current active 532 * slave. 533 */ 534 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work) 535 { 536 struct bonding *bond = container_of(work, struct bonding, 537 mcast_work.work); 538 539 if (!rtnl_trylock()) { 540 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 541 return; 542 } 543 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev); 544 545 if (bond->igmp_retrans > 1) { 546 bond->igmp_retrans--; 547 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); 548 } 549 rtnl_unlock(); 550 } 551 552 /* Flush bond's hardware addresses from slave */ 553 static void bond_hw_addr_flush(struct net_device *bond_dev, 554 struct net_device *slave_dev) 555 { 556 struct bonding *bond = netdev_priv(bond_dev); 557 558 dev_uc_unsync(slave_dev, bond_dev); 559 dev_mc_unsync(slave_dev, bond_dev); 560 561 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 562 /* del lacpdu mc addr from mc list */ 563 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 564 565 dev_mc_del(slave_dev, lacpdu_multicast); 566 } 567 } 568 569 /*--------------------------- Active slave change ---------------------------*/ 570 571 /* Update the hardware address list and promisc/allmulti for the new and 572 * old active slaves (if any). Modes that are not using primary keep all 573 * slaves up date at all times; only the modes that use primary need to call 574 * this function to swap these settings during a failover. 575 */ 576 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active, 577 struct slave *old_active) 578 { 579 if (old_active) { 580 if (bond->dev->flags & IFF_PROMISC) 581 dev_set_promiscuity(old_active->dev, -1); 582 583 if (bond->dev->flags & IFF_ALLMULTI) 584 dev_set_allmulti(old_active->dev, -1); 585 586 bond_hw_addr_flush(bond->dev, old_active->dev); 587 } 588 589 if (new_active) { 590 /* FIXME: Signal errors upstream. */ 591 if (bond->dev->flags & IFF_PROMISC) 592 dev_set_promiscuity(new_active->dev, 1); 593 594 if (bond->dev->flags & IFF_ALLMULTI) 595 dev_set_allmulti(new_active->dev, 1); 596 597 netif_addr_lock_bh(bond->dev); 598 dev_uc_sync(new_active->dev, bond->dev); 599 dev_mc_sync(new_active->dev, bond->dev); 600 netif_addr_unlock_bh(bond->dev); 601 } 602 } 603 604 /** 605 * bond_set_dev_addr - clone slave's address to bond 606 * @bond_dev: bond net device 607 * @slave_dev: slave net device 608 * 609 * Should be called with RTNL held. 610 */ 611 static void bond_set_dev_addr(struct net_device *bond_dev, 612 struct net_device *slave_dev) 613 { 614 netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->name=%s slave_dev->addr_len=%d\n", 615 bond_dev, slave_dev, slave_dev->name, slave_dev->addr_len); 616 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len); 617 bond_dev->addr_assign_type = NET_ADDR_STOLEN; 618 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev); 619 } 620 621 static struct slave *bond_get_old_active(struct bonding *bond, 622 struct slave *new_active) 623 { 624 struct slave *slave; 625 struct list_head *iter; 626 627 bond_for_each_slave(bond, slave, iter) { 628 if (slave == new_active) 629 continue; 630 631 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr)) 632 return slave; 633 } 634 635 return NULL; 636 } 637 638 /* bond_do_fail_over_mac 639 * 640 * Perform special MAC address swapping for fail_over_mac settings 641 * 642 * Called with RTNL 643 */ 644 static void bond_do_fail_over_mac(struct bonding *bond, 645 struct slave *new_active, 646 struct slave *old_active) 647 { 648 u8 tmp_mac[MAX_ADDR_LEN]; 649 struct sockaddr_storage ss; 650 int rv; 651 652 switch (bond->params.fail_over_mac) { 653 case BOND_FOM_ACTIVE: 654 if (new_active) 655 bond_set_dev_addr(bond->dev, new_active->dev); 656 break; 657 case BOND_FOM_FOLLOW: 658 /* if new_active && old_active, swap them 659 * if just old_active, do nothing (going to no active slave) 660 * if just new_active, set new_active to bond's MAC 661 */ 662 if (!new_active) 663 return; 664 665 if (!old_active) 666 old_active = bond_get_old_active(bond, new_active); 667 668 if (old_active) { 669 bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr, 670 new_active->dev->addr_len); 671 bond_hw_addr_copy(ss.__data, 672 old_active->dev->dev_addr, 673 old_active->dev->addr_len); 674 ss.ss_family = new_active->dev->type; 675 } else { 676 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr, 677 bond->dev->addr_len); 678 ss.ss_family = bond->dev->type; 679 } 680 681 rv = dev_set_mac_address(new_active->dev, 682 (struct sockaddr *)&ss); 683 if (rv) { 684 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n", 685 -rv, new_active->dev->name); 686 goto out; 687 } 688 689 if (!old_active) 690 goto out; 691 692 bond_hw_addr_copy(ss.__data, tmp_mac, 693 new_active->dev->addr_len); 694 ss.ss_family = old_active->dev->type; 695 696 rv = dev_set_mac_address(old_active->dev, 697 (struct sockaddr *)&ss); 698 if (rv) 699 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n", 700 -rv, new_active->dev->name); 701 out: 702 break; 703 default: 704 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n", 705 bond->params.fail_over_mac); 706 break; 707 } 708 709 } 710 711 static struct slave *bond_choose_primary_or_current(struct bonding *bond) 712 { 713 struct slave *prim = rtnl_dereference(bond->primary_slave); 714 struct slave *curr = rtnl_dereference(bond->curr_active_slave); 715 716 if (!prim || prim->link != BOND_LINK_UP) { 717 if (!curr || curr->link != BOND_LINK_UP) 718 return NULL; 719 return curr; 720 } 721 722 if (bond->force_primary) { 723 bond->force_primary = false; 724 return prim; 725 } 726 727 if (!curr || curr->link != BOND_LINK_UP) 728 return prim; 729 730 /* At this point, prim and curr are both up */ 731 switch (bond->params.primary_reselect) { 732 case BOND_PRI_RESELECT_ALWAYS: 733 return prim; 734 case BOND_PRI_RESELECT_BETTER: 735 if (prim->speed < curr->speed) 736 return curr; 737 if (prim->speed == curr->speed && prim->duplex <= curr->duplex) 738 return curr; 739 return prim; 740 case BOND_PRI_RESELECT_FAILURE: 741 return curr; 742 default: 743 netdev_err(bond->dev, "impossible primary_reselect %d\n", 744 bond->params.primary_reselect); 745 return curr; 746 } 747 } 748 749 /** 750 * bond_find_best_slave - select the best available slave to be the active one 751 * @bond: our bonding struct 752 */ 753 static struct slave *bond_find_best_slave(struct bonding *bond) 754 { 755 struct slave *slave, *bestslave = NULL; 756 struct list_head *iter; 757 int mintime = bond->params.updelay; 758 759 slave = bond_choose_primary_or_current(bond); 760 if (slave) 761 return slave; 762 763 bond_for_each_slave(bond, slave, iter) { 764 if (slave->link == BOND_LINK_UP) 765 return slave; 766 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) && 767 slave->delay < mintime) { 768 mintime = slave->delay; 769 bestslave = slave; 770 } 771 } 772 773 return bestslave; 774 } 775 776 static bool bond_should_notify_peers(struct bonding *bond) 777 { 778 struct slave *slave; 779 780 rcu_read_lock(); 781 slave = rcu_dereference(bond->curr_active_slave); 782 rcu_read_unlock(); 783 784 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n", 785 slave ? slave->dev->name : "NULL"); 786 787 if (!slave || !bond->send_peer_notif || 788 !netif_carrier_ok(bond->dev) || 789 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) 790 return false; 791 792 return true; 793 } 794 795 /** 796 * change_active_interface - change the active slave into the specified one 797 * @bond: our bonding struct 798 * @new: the new slave to make the active one 799 * 800 * Set the new slave to the bond's settings and unset them on the old 801 * curr_active_slave. 802 * Setting include flags, mc-list, promiscuity, allmulti, etc. 803 * 804 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, 805 * because it is apparently the best available slave we have, even though its 806 * updelay hasn't timed out yet. 807 * 808 * Caller must hold RTNL. 809 */ 810 void bond_change_active_slave(struct bonding *bond, struct slave *new_active) 811 { 812 struct slave *old_active; 813 814 ASSERT_RTNL(); 815 816 old_active = rtnl_dereference(bond->curr_active_slave); 817 818 if (old_active == new_active) 819 return; 820 821 if (new_active) { 822 new_active->last_link_up = jiffies; 823 824 if (new_active->link == BOND_LINK_BACK) { 825 if (bond_uses_primary(bond)) { 826 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n", 827 new_active->dev->name, 828 (bond->params.updelay - new_active->delay) * bond->params.miimon); 829 } 830 831 new_active->delay = 0; 832 bond_set_slave_link_state(new_active, BOND_LINK_UP, 833 BOND_SLAVE_NOTIFY_NOW); 834 835 if (BOND_MODE(bond) == BOND_MODE_8023AD) 836 bond_3ad_handle_link_change(new_active, BOND_LINK_UP); 837 838 if (bond_is_lb(bond)) 839 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); 840 } else { 841 if (bond_uses_primary(bond)) { 842 netdev_info(bond->dev, "making interface %s the new active one\n", 843 new_active->dev->name); 844 } 845 } 846 } 847 848 if (bond_uses_primary(bond)) 849 bond_hw_addr_swap(bond, new_active, old_active); 850 851 if (bond_is_lb(bond)) { 852 bond_alb_handle_active_change(bond, new_active); 853 if (old_active) 854 bond_set_slave_inactive_flags(old_active, 855 BOND_SLAVE_NOTIFY_NOW); 856 if (new_active) 857 bond_set_slave_active_flags(new_active, 858 BOND_SLAVE_NOTIFY_NOW); 859 } else { 860 rcu_assign_pointer(bond->curr_active_slave, new_active); 861 } 862 863 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) { 864 if (old_active) 865 bond_set_slave_inactive_flags(old_active, 866 BOND_SLAVE_NOTIFY_NOW); 867 868 if (new_active) { 869 bool should_notify_peers = false; 870 871 bond_set_slave_active_flags(new_active, 872 BOND_SLAVE_NOTIFY_NOW); 873 874 if (bond->params.fail_over_mac) 875 bond_do_fail_over_mac(bond, new_active, 876 old_active); 877 878 if (netif_running(bond->dev)) { 879 bond->send_peer_notif = 880 bond->params.num_peer_notif; 881 should_notify_peers = 882 bond_should_notify_peers(bond); 883 } 884 885 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev); 886 if (should_notify_peers) 887 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 888 bond->dev); 889 } 890 } 891 892 /* resend IGMP joins since active slave has changed or 893 * all were sent on curr_active_slave. 894 * resend only if bond is brought up with the affected 895 * bonding modes and the retransmission is enabled 896 */ 897 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && 898 ((bond_uses_primary(bond) && new_active) || 899 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) { 900 bond->igmp_retrans = bond->params.resend_igmp; 901 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 902 } 903 } 904 905 /** 906 * bond_select_active_slave - select a new active slave, if needed 907 * @bond: our bonding struct 908 * 909 * This functions should be called when one of the following occurs: 910 * - The old curr_active_slave has been released or lost its link. 911 * - The primary_slave has got its link back. 912 * - A slave has got its link back and there's no old curr_active_slave. 913 * 914 * Caller must hold RTNL. 915 */ 916 void bond_select_active_slave(struct bonding *bond) 917 { 918 struct slave *best_slave; 919 int rv; 920 921 ASSERT_RTNL(); 922 923 best_slave = bond_find_best_slave(bond); 924 if (best_slave != rtnl_dereference(bond->curr_active_slave)) { 925 bond_change_active_slave(bond, best_slave); 926 rv = bond_set_carrier(bond); 927 if (!rv) 928 return; 929 930 if (netif_carrier_ok(bond->dev)) 931 netdev_info(bond->dev, "first active interface up!\n"); 932 else 933 netdev_info(bond->dev, "now running without any active interface!\n"); 934 } 935 } 936 937 #ifdef CONFIG_NET_POLL_CONTROLLER 938 static inline int slave_enable_netpoll(struct slave *slave) 939 { 940 struct netpoll *np; 941 int err = 0; 942 943 np = kzalloc(sizeof(*np), GFP_KERNEL); 944 err = -ENOMEM; 945 if (!np) 946 goto out; 947 948 err = __netpoll_setup(np, slave->dev); 949 if (err) { 950 kfree(np); 951 goto out; 952 } 953 slave->np = np; 954 out: 955 return err; 956 } 957 static inline void slave_disable_netpoll(struct slave *slave) 958 { 959 struct netpoll *np = slave->np; 960 961 if (!np) 962 return; 963 964 slave->np = NULL; 965 __netpoll_free_async(np); 966 } 967 968 static void bond_poll_controller(struct net_device *bond_dev) 969 { 970 struct bonding *bond = netdev_priv(bond_dev); 971 struct slave *slave = NULL; 972 struct list_head *iter; 973 struct ad_info ad_info; 974 struct netpoll_info *ni; 975 const struct net_device_ops *ops; 976 977 if (BOND_MODE(bond) == BOND_MODE_8023AD) 978 if (bond_3ad_get_active_agg_info(bond, &ad_info)) 979 return; 980 981 bond_for_each_slave_rcu(bond, slave, iter) { 982 ops = slave->dev->netdev_ops; 983 if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller) 984 continue; 985 986 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 987 struct aggregator *agg = 988 SLAVE_AD_INFO(slave)->port.aggregator; 989 990 if (agg && 991 agg->aggregator_identifier != ad_info.aggregator_id) 992 continue; 993 } 994 995 ni = rcu_dereference_bh(slave->dev->npinfo); 996 if (down_trylock(&ni->dev_lock)) 997 continue; 998 ops->ndo_poll_controller(slave->dev); 999 up(&ni->dev_lock); 1000 } 1001 } 1002 1003 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1004 { 1005 struct bonding *bond = netdev_priv(bond_dev); 1006 struct list_head *iter; 1007 struct slave *slave; 1008 1009 bond_for_each_slave(bond, slave, iter) 1010 if (bond_slave_is_up(slave)) 1011 slave_disable_netpoll(slave); 1012 } 1013 1014 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) 1015 { 1016 struct bonding *bond = netdev_priv(dev); 1017 struct list_head *iter; 1018 struct slave *slave; 1019 int err = 0; 1020 1021 bond_for_each_slave(bond, slave, iter) { 1022 err = slave_enable_netpoll(slave); 1023 if (err) { 1024 bond_netpoll_cleanup(dev); 1025 break; 1026 } 1027 } 1028 return err; 1029 } 1030 #else 1031 static inline int slave_enable_netpoll(struct slave *slave) 1032 { 1033 return 0; 1034 } 1035 static inline void slave_disable_netpoll(struct slave *slave) 1036 { 1037 } 1038 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1039 { 1040 } 1041 #endif 1042 1043 /*---------------------------------- IOCTL ----------------------------------*/ 1044 1045 static netdev_features_t bond_fix_features(struct net_device *dev, 1046 netdev_features_t features) 1047 { 1048 struct bonding *bond = netdev_priv(dev); 1049 struct list_head *iter; 1050 netdev_features_t mask; 1051 struct slave *slave; 1052 1053 mask = features; 1054 1055 features &= ~NETIF_F_ONE_FOR_ALL; 1056 features |= NETIF_F_ALL_FOR_ALL; 1057 1058 bond_for_each_slave(bond, slave, iter) { 1059 features = netdev_increment_features(features, 1060 slave->dev->features, 1061 mask); 1062 } 1063 features = netdev_add_tso_features(features, mask); 1064 1065 return features; 1066 } 1067 1068 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1069 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \ 1070 NETIF_F_HIGHDMA | NETIF_F_LRO) 1071 1072 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1073 NETIF_F_RXCSUM | NETIF_F_ALL_TSO) 1074 1075 static void bond_compute_features(struct bonding *bond) 1076 { 1077 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE | 1078 IFF_XMIT_DST_RELEASE_PERM; 1079 netdev_features_t vlan_features = BOND_VLAN_FEATURES; 1080 netdev_features_t enc_features = BOND_ENC_FEATURES; 1081 struct net_device *bond_dev = bond->dev; 1082 struct list_head *iter; 1083 struct slave *slave; 1084 unsigned short max_hard_header_len = ETH_HLEN; 1085 unsigned int gso_max_size = GSO_MAX_SIZE; 1086 u16 gso_max_segs = GSO_MAX_SEGS; 1087 1088 if (!bond_has_slaves(bond)) 1089 goto done; 1090 vlan_features &= NETIF_F_ALL_FOR_ALL; 1091 1092 bond_for_each_slave(bond, slave, iter) { 1093 vlan_features = netdev_increment_features(vlan_features, 1094 slave->dev->vlan_features, BOND_VLAN_FEATURES); 1095 1096 enc_features = netdev_increment_features(enc_features, 1097 slave->dev->hw_enc_features, 1098 BOND_ENC_FEATURES); 1099 dst_release_flag &= slave->dev->priv_flags; 1100 if (slave->dev->hard_header_len > max_hard_header_len) 1101 max_hard_header_len = slave->dev->hard_header_len; 1102 1103 gso_max_size = min(gso_max_size, slave->dev->gso_max_size); 1104 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs); 1105 } 1106 bond_dev->hard_header_len = max_hard_header_len; 1107 1108 done: 1109 bond_dev->vlan_features = vlan_features; 1110 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL; 1111 bond_dev->gso_max_segs = gso_max_segs; 1112 netif_set_gso_max_size(bond_dev, gso_max_size); 1113 1114 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1115 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) && 1116 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM)) 1117 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE; 1118 1119 netdev_change_features(bond_dev); 1120 } 1121 1122 static void bond_setup_by_slave(struct net_device *bond_dev, 1123 struct net_device *slave_dev) 1124 { 1125 bond_dev->header_ops = slave_dev->header_ops; 1126 1127 bond_dev->type = slave_dev->type; 1128 bond_dev->hard_header_len = slave_dev->hard_header_len; 1129 bond_dev->addr_len = slave_dev->addr_len; 1130 1131 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1132 slave_dev->addr_len); 1133 } 1134 1135 /* On bonding slaves other than the currently active slave, suppress 1136 * duplicates except for alb non-mcast/bcast. 1137 */ 1138 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1139 struct slave *slave, 1140 struct bonding *bond) 1141 { 1142 if (bond_is_slave_inactive(slave)) { 1143 if (BOND_MODE(bond) == BOND_MODE_ALB && 1144 skb->pkt_type != PACKET_BROADCAST && 1145 skb->pkt_type != PACKET_MULTICAST) 1146 return false; 1147 return true; 1148 } 1149 return false; 1150 } 1151 1152 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1153 { 1154 struct sk_buff *skb = *pskb; 1155 struct slave *slave; 1156 struct bonding *bond; 1157 int (*recv_probe)(const struct sk_buff *, struct bonding *, 1158 struct slave *); 1159 int ret = RX_HANDLER_ANOTHER; 1160 1161 skb = skb_share_check(skb, GFP_ATOMIC); 1162 if (unlikely(!skb)) 1163 return RX_HANDLER_CONSUMED; 1164 1165 *pskb = skb; 1166 1167 slave = bond_slave_get_rcu(skb->dev); 1168 bond = slave->bond; 1169 1170 recv_probe = READ_ONCE(bond->recv_probe); 1171 if (recv_probe) { 1172 ret = recv_probe(skb, bond, slave); 1173 if (ret == RX_HANDLER_CONSUMED) { 1174 consume_skb(skb); 1175 return ret; 1176 } 1177 } 1178 1179 /* don't change skb->dev for link-local packets */ 1180 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest)) 1181 return RX_HANDLER_PASS; 1182 if (bond_should_deliver_exact_match(skb, slave, bond)) 1183 return RX_HANDLER_EXACT; 1184 1185 skb->dev = bond->dev; 1186 1187 if (BOND_MODE(bond) == BOND_MODE_ALB && 1188 bond->dev->priv_flags & IFF_BRIDGE_PORT && 1189 skb->pkt_type == PACKET_HOST) { 1190 1191 if (unlikely(skb_cow_head(skb, 1192 skb->data - skb_mac_header(skb)))) { 1193 kfree_skb(skb); 1194 return RX_HANDLER_CONSUMED; 1195 } 1196 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, 1197 bond->dev->addr_len); 1198 } 1199 1200 return ret; 1201 } 1202 1203 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond) 1204 { 1205 switch (BOND_MODE(bond)) { 1206 case BOND_MODE_ROUNDROBIN: 1207 return NETDEV_LAG_TX_TYPE_ROUNDROBIN; 1208 case BOND_MODE_ACTIVEBACKUP: 1209 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP; 1210 case BOND_MODE_BROADCAST: 1211 return NETDEV_LAG_TX_TYPE_BROADCAST; 1212 case BOND_MODE_XOR: 1213 case BOND_MODE_8023AD: 1214 return NETDEV_LAG_TX_TYPE_HASH; 1215 default: 1216 return NETDEV_LAG_TX_TYPE_UNKNOWN; 1217 } 1218 } 1219 1220 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave, 1221 struct netlink_ext_ack *extack) 1222 { 1223 struct netdev_lag_upper_info lag_upper_info; 1224 1225 lag_upper_info.tx_type = bond_lag_tx_type(bond); 1226 1227 return netdev_master_upper_dev_link(slave->dev, bond->dev, slave, 1228 &lag_upper_info, extack); 1229 } 1230 1231 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave) 1232 { 1233 netdev_upper_dev_unlink(slave->dev, bond->dev); 1234 slave->dev->flags &= ~IFF_SLAVE; 1235 } 1236 1237 static struct slave *bond_alloc_slave(struct bonding *bond) 1238 { 1239 struct slave *slave = NULL; 1240 1241 slave = kzalloc(sizeof(*slave), GFP_KERNEL); 1242 if (!slave) 1243 return NULL; 1244 1245 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1246 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info), 1247 GFP_KERNEL); 1248 if (!SLAVE_AD_INFO(slave)) { 1249 kfree(slave); 1250 return NULL; 1251 } 1252 } 1253 return slave; 1254 } 1255 1256 static void bond_free_slave(struct slave *slave) 1257 { 1258 struct bonding *bond = bond_get_bond_by_slave(slave); 1259 1260 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1261 kfree(SLAVE_AD_INFO(slave)); 1262 1263 kfree(slave); 1264 } 1265 1266 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info) 1267 { 1268 info->bond_mode = BOND_MODE(bond); 1269 info->miimon = bond->params.miimon; 1270 info->num_slaves = bond->slave_cnt; 1271 } 1272 1273 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info) 1274 { 1275 strcpy(info->slave_name, slave->dev->name); 1276 info->link = slave->link; 1277 info->state = bond_slave_state(slave); 1278 info->link_failure_count = slave->link_failure_count; 1279 } 1280 1281 static void bond_netdev_notify(struct net_device *dev, 1282 struct netdev_bonding_info *info) 1283 { 1284 rtnl_lock(); 1285 netdev_bonding_info_change(dev, info); 1286 rtnl_unlock(); 1287 } 1288 1289 static void bond_netdev_notify_work(struct work_struct *_work) 1290 { 1291 struct netdev_notify_work *w = 1292 container_of(_work, struct netdev_notify_work, work.work); 1293 1294 bond_netdev_notify(w->dev, &w->bonding_info); 1295 dev_put(w->dev); 1296 kfree(w); 1297 } 1298 1299 void bond_queue_slave_event(struct slave *slave) 1300 { 1301 struct bonding *bond = slave->bond; 1302 struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC); 1303 1304 if (!nnw) 1305 return; 1306 1307 dev_hold(slave->dev); 1308 nnw->dev = slave->dev; 1309 bond_fill_ifslave(slave, &nnw->bonding_info.slave); 1310 bond_fill_ifbond(bond, &nnw->bonding_info.master); 1311 INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work); 1312 1313 queue_delayed_work(slave->bond->wq, &nnw->work, 0); 1314 } 1315 1316 void bond_lower_state_changed(struct slave *slave) 1317 { 1318 struct netdev_lag_lower_state_info info; 1319 1320 info.link_up = slave->link == BOND_LINK_UP || 1321 slave->link == BOND_LINK_FAIL; 1322 info.tx_enabled = bond_is_active_slave(slave); 1323 netdev_lower_state_changed(slave->dev, &info); 1324 } 1325 1326 /* enslave device <slave> to bond device <master> */ 1327 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev, 1328 struct netlink_ext_ack *extack) 1329 { 1330 struct bonding *bond = netdev_priv(bond_dev); 1331 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1332 struct slave *new_slave = NULL, *prev_slave; 1333 struct sockaddr_storage ss; 1334 int link_reporting; 1335 int res = 0, i; 1336 1337 if (!bond->params.use_carrier && 1338 slave_dev->ethtool_ops->get_link == NULL && 1339 slave_ops->ndo_do_ioctl == NULL) { 1340 netdev_warn(bond_dev, "no link monitoring support for %s\n", 1341 slave_dev->name); 1342 } 1343 1344 /* already in-use? */ 1345 if (netdev_is_rx_handler_busy(slave_dev)) { 1346 NL_SET_ERR_MSG(extack, "Device is in use and cannot be enslaved"); 1347 netdev_err(bond_dev, 1348 "Error: Device is in use and cannot be enslaved\n"); 1349 return -EBUSY; 1350 } 1351 1352 if (bond_dev == slave_dev) { 1353 NL_SET_ERR_MSG(extack, "Cannot enslave bond to itself."); 1354 netdev_err(bond_dev, "cannot enslave bond to itself.\n"); 1355 return -EPERM; 1356 } 1357 1358 /* vlan challenged mutual exclusion */ 1359 /* no need to lock since we're protected by rtnl_lock */ 1360 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1361 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n", 1362 slave_dev->name); 1363 if (vlan_uses_dev(bond_dev)) { 1364 NL_SET_ERR_MSG(extack, "Can not enslave VLAN challenged device to VLAN enabled bond"); 1365 netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n", 1366 slave_dev->name, bond_dev->name); 1367 return -EPERM; 1368 } else { 1369 netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n", 1370 slave_dev->name, slave_dev->name, 1371 bond_dev->name); 1372 } 1373 } else { 1374 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n", 1375 slave_dev->name); 1376 } 1377 1378 /* Old ifenslave binaries are no longer supported. These can 1379 * be identified with moderate accuracy by the state of the slave: 1380 * the current ifenslave will set the interface down prior to 1381 * enslaving it; the old ifenslave will not. 1382 */ 1383 if (slave_dev->flags & IFF_UP) { 1384 NL_SET_ERR_MSG(extack, "Device can not be enslaved while up"); 1385 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n", 1386 slave_dev->name); 1387 return -EPERM; 1388 } 1389 1390 /* set bonding device ether type by slave - bonding netdevices are 1391 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1392 * there is a need to override some of the type dependent attribs/funcs. 1393 * 1394 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1395 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1396 */ 1397 if (!bond_has_slaves(bond)) { 1398 if (bond_dev->type != slave_dev->type) { 1399 netdev_dbg(bond_dev, "change device type from %d to %d\n", 1400 bond_dev->type, slave_dev->type); 1401 1402 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, 1403 bond_dev); 1404 res = notifier_to_errno(res); 1405 if (res) { 1406 netdev_err(bond_dev, "refused to change device type\n"); 1407 return -EBUSY; 1408 } 1409 1410 /* Flush unicast and multicast addresses */ 1411 dev_uc_flush(bond_dev); 1412 dev_mc_flush(bond_dev); 1413 1414 if (slave_dev->type != ARPHRD_ETHER) 1415 bond_setup_by_slave(bond_dev, slave_dev); 1416 else { 1417 ether_setup(bond_dev); 1418 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1419 } 1420 1421 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, 1422 bond_dev); 1423 } 1424 } else if (bond_dev->type != slave_dev->type) { 1425 NL_SET_ERR_MSG(extack, "Device type is different from other slaves"); 1426 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n", 1427 slave_dev->name, slave_dev->type, bond_dev->type); 1428 return -EINVAL; 1429 } 1430 1431 if (slave_dev->type == ARPHRD_INFINIBAND && 1432 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1433 NL_SET_ERR_MSG(extack, "Only active-backup mode is supported for infiniband slaves"); 1434 netdev_warn(bond_dev, "Type (%d) supports only active-backup mode\n", 1435 slave_dev->type); 1436 res = -EOPNOTSUPP; 1437 goto err_undo_flags; 1438 } 1439 1440 if (!slave_ops->ndo_set_mac_address || 1441 slave_dev->type == ARPHRD_INFINIBAND) { 1442 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n"); 1443 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP && 1444 bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1445 if (!bond_has_slaves(bond)) { 1446 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1447 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n"); 1448 } else { 1449 NL_SET_ERR_MSG(extack, "Slave device does not support setting the MAC address, but fail_over_mac is not set to active"); 1450 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"); 1451 res = -EOPNOTSUPP; 1452 goto err_undo_flags; 1453 } 1454 } 1455 } 1456 1457 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1458 1459 /* If this is the first slave, then we need to set the master's hardware 1460 * address to be the same as the slave's. 1461 */ 1462 if (!bond_has_slaves(bond) && 1463 bond->dev->addr_assign_type == NET_ADDR_RANDOM) 1464 bond_set_dev_addr(bond->dev, slave_dev); 1465 1466 new_slave = bond_alloc_slave(bond); 1467 if (!new_slave) { 1468 res = -ENOMEM; 1469 goto err_undo_flags; 1470 } 1471 1472 new_slave->bond = bond; 1473 new_slave->dev = slave_dev; 1474 /* Set the new_slave's queue_id to be zero. Queue ID mapping 1475 * is set via sysfs or module option if desired. 1476 */ 1477 new_slave->queue_id = 0; 1478 1479 /* Save slave's original mtu and then set it to match the bond */ 1480 new_slave->original_mtu = slave_dev->mtu; 1481 res = dev_set_mtu(slave_dev, bond->dev->mtu); 1482 if (res) { 1483 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res); 1484 goto err_free; 1485 } 1486 1487 /* Save slave's original ("permanent") mac address for modes 1488 * that need it, and for restoring it upon release, and then 1489 * set it to the master's address 1490 */ 1491 bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr, 1492 slave_dev->addr_len); 1493 1494 if (!bond->params.fail_over_mac || 1495 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1496 /* Set slave to master's mac address. The application already 1497 * set the master's mac address to that of the first slave 1498 */ 1499 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 1500 ss.ss_family = slave_dev->type; 1501 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss); 1502 if (res) { 1503 netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res); 1504 goto err_restore_mtu; 1505 } 1506 } 1507 1508 /* set slave flag before open to prevent IPv6 addrconf */ 1509 slave_dev->flags |= IFF_SLAVE; 1510 1511 /* open the slave since the application closed it */ 1512 res = dev_open(slave_dev); 1513 if (res) { 1514 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name); 1515 goto err_restore_mac; 1516 } 1517 1518 slave_dev->priv_flags |= IFF_BONDING; 1519 /* initialize slave stats */ 1520 dev_get_stats(new_slave->dev, &new_slave->slave_stats); 1521 1522 if (bond_is_lb(bond)) { 1523 /* bond_alb_init_slave() must be called before all other stages since 1524 * it might fail and we do not want to have to undo everything 1525 */ 1526 res = bond_alb_init_slave(bond, new_slave); 1527 if (res) 1528 goto err_close; 1529 } 1530 1531 res = vlan_vids_add_by_dev(slave_dev, bond_dev); 1532 if (res) { 1533 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n", 1534 slave_dev->name); 1535 goto err_close; 1536 } 1537 1538 prev_slave = bond_last_slave(bond); 1539 1540 new_slave->delay = 0; 1541 new_slave->link_failure_count = 0; 1542 1543 if (bond_update_speed_duplex(new_slave) && 1544 bond_needs_speed_duplex(bond)) 1545 new_slave->link = BOND_LINK_DOWN; 1546 1547 new_slave->last_rx = jiffies - 1548 (msecs_to_jiffies(bond->params.arp_interval) + 1); 1549 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) 1550 new_slave->target_last_arp_rx[i] = new_slave->last_rx; 1551 1552 if (bond->params.miimon && !bond->params.use_carrier) { 1553 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 1554 1555 if ((link_reporting == -1) && !bond->params.arp_interval) { 1556 /* miimon is set but a bonded network driver 1557 * does not support ETHTOOL/MII and 1558 * arp_interval is not set. Note: if 1559 * use_carrier is enabled, we will never go 1560 * here (because netif_carrier is always 1561 * supported); thus, we don't need to change 1562 * the messages for netif_carrier. 1563 */ 1564 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", 1565 slave_dev->name); 1566 } else if (link_reporting == -1) { 1567 /* unable get link status using mii/ethtool */ 1568 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", 1569 slave_dev->name); 1570 } 1571 } 1572 1573 /* check for initial state */ 1574 new_slave->link = BOND_LINK_NOCHANGE; 1575 if (bond->params.miimon) { 1576 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { 1577 if (bond->params.updelay) { 1578 bond_set_slave_link_state(new_slave, 1579 BOND_LINK_BACK, 1580 BOND_SLAVE_NOTIFY_NOW); 1581 new_slave->delay = bond->params.updelay; 1582 } else { 1583 bond_set_slave_link_state(new_slave, 1584 BOND_LINK_UP, 1585 BOND_SLAVE_NOTIFY_NOW); 1586 } 1587 } else { 1588 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN, 1589 BOND_SLAVE_NOTIFY_NOW); 1590 } 1591 } else if (bond->params.arp_interval) { 1592 bond_set_slave_link_state(new_slave, 1593 (netif_carrier_ok(slave_dev) ? 1594 BOND_LINK_UP : BOND_LINK_DOWN), 1595 BOND_SLAVE_NOTIFY_NOW); 1596 } else { 1597 bond_set_slave_link_state(new_slave, BOND_LINK_UP, 1598 BOND_SLAVE_NOTIFY_NOW); 1599 } 1600 1601 if (new_slave->link != BOND_LINK_DOWN) 1602 new_slave->last_link_up = jiffies; 1603 netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n", 1604 new_slave->link == BOND_LINK_DOWN ? "DOWN" : 1605 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); 1606 1607 if (bond_uses_primary(bond) && bond->params.primary[0]) { 1608 /* if there is a primary slave, remember it */ 1609 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 1610 rcu_assign_pointer(bond->primary_slave, new_slave); 1611 bond->force_primary = true; 1612 } 1613 } 1614 1615 switch (BOND_MODE(bond)) { 1616 case BOND_MODE_ACTIVEBACKUP: 1617 bond_set_slave_inactive_flags(new_slave, 1618 BOND_SLAVE_NOTIFY_NOW); 1619 break; 1620 case BOND_MODE_8023AD: 1621 /* in 802.3ad mode, the internal mechanism 1622 * will activate the slaves in the selected 1623 * aggregator 1624 */ 1625 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 1626 /* if this is the first slave */ 1627 if (!prev_slave) { 1628 SLAVE_AD_INFO(new_slave)->id = 1; 1629 /* Initialize AD with the number of times that the AD timer is called in 1 second 1630 * can be called only after the mac address of the bond is set 1631 */ 1632 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL); 1633 } else { 1634 SLAVE_AD_INFO(new_slave)->id = 1635 SLAVE_AD_INFO(prev_slave)->id + 1; 1636 } 1637 1638 bond_3ad_bind_slave(new_slave); 1639 break; 1640 case BOND_MODE_TLB: 1641 case BOND_MODE_ALB: 1642 bond_set_active_slave(new_slave); 1643 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 1644 break; 1645 default: 1646 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n"); 1647 1648 /* always active in trunk mode */ 1649 bond_set_active_slave(new_slave); 1650 1651 /* In trunking mode there is little meaning to curr_active_slave 1652 * anyway (it holds no special properties of the bond device), 1653 * so we can change it without calling change_active_interface() 1654 */ 1655 if (!rcu_access_pointer(bond->curr_active_slave) && 1656 new_slave->link == BOND_LINK_UP) 1657 rcu_assign_pointer(bond->curr_active_slave, new_slave); 1658 1659 break; 1660 } /* switch(bond_mode) */ 1661 1662 #ifdef CONFIG_NET_POLL_CONTROLLER 1663 if (bond->dev->npinfo) { 1664 if (slave_enable_netpoll(new_slave)) { 1665 netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n"); 1666 res = -EBUSY; 1667 goto err_detach; 1668 } 1669 } 1670 #endif 1671 1672 if (!(bond_dev->features & NETIF_F_LRO)) 1673 dev_disable_lro(slave_dev); 1674 1675 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 1676 new_slave); 1677 if (res) { 1678 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res); 1679 goto err_detach; 1680 } 1681 1682 res = bond_master_upper_dev_link(bond, new_slave, extack); 1683 if (res) { 1684 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res); 1685 goto err_unregister; 1686 } 1687 1688 res = bond_sysfs_slave_add(new_slave); 1689 if (res) { 1690 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res); 1691 goto err_upper_unlink; 1692 } 1693 1694 /* If the mode uses primary, then the following is handled by 1695 * bond_change_active_slave(). 1696 */ 1697 if (!bond_uses_primary(bond)) { 1698 /* set promiscuity level to new slave */ 1699 if (bond_dev->flags & IFF_PROMISC) { 1700 res = dev_set_promiscuity(slave_dev, 1); 1701 if (res) 1702 goto err_sysfs_del; 1703 } 1704 1705 /* set allmulti level to new slave */ 1706 if (bond_dev->flags & IFF_ALLMULTI) { 1707 res = dev_set_allmulti(slave_dev, 1); 1708 if (res) { 1709 if (bond_dev->flags & IFF_PROMISC) 1710 dev_set_promiscuity(slave_dev, -1); 1711 goto err_sysfs_del; 1712 } 1713 } 1714 1715 netif_addr_lock_bh(bond_dev); 1716 dev_mc_sync_multiple(slave_dev, bond_dev); 1717 dev_uc_sync_multiple(slave_dev, bond_dev); 1718 netif_addr_unlock_bh(bond_dev); 1719 1720 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1721 /* add lacpdu mc addr to mc list */ 1722 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 1723 1724 dev_mc_add(slave_dev, lacpdu_multicast); 1725 } 1726 } 1727 1728 bond->slave_cnt++; 1729 bond_compute_features(bond); 1730 bond_set_carrier(bond); 1731 1732 if (bond_uses_primary(bond)) { 1733 block_netpoll_tx(); 1734 bond_select_active_slave(bond); 1735 unblock_netpoll_tx(); 1736 } 1737 1738 if (bond_mode_uses_xmit_hash(bond)) 1739 bond_update_slave_arr(bond, NULL); 1740 1741 bond->nest_level = dev_get_nest_level(bond_dev); 1742 1743 netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n", 1744 slave_dev->name, 1745 bond_is_active_slave(new_slave) ? "an active" : "a backup", 1746 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down"); 1747 1748 /* enslave is successful */ 1749 bond_queue_slave_event(new_slave); 1750 return 0; 1751 1752 /* Undo stages on error */ 1753 err_sysfs_del: 1754 bond_sysfs_slave_del(new_slave); 1755 1756 err_upper_unlink: 1757 bond_upper_dev_unlink(bond, new_slave); 1758 1759 err_unregister: 1760 netdev_rx_handler_unregister(slave_dev); 1761 1762 err_detach: 1763 vlan_vids_del_by_dev(slave_dev, bond_dev); 1764 if (rcu_access_pointer(bond->primary_slave) == new_slave) 1765 RCU_INIT_POINTER(bond->primary_slave, NULL); 1766 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) { 1767 block_netpoll_tx(); 1768 bond_change_active_slave(bond, NULL); 1769 bond_select_active_slave(bond); 1770 unblock_netpoll_tx(); 1771 } 1772 /* either primary_slave or curr_active_slave might've changed */ 1773 synchronize_rcu(); 1774 slave_disable_netpoll(new_slave); 1775 1776 err_close: 1777 slave_dev->priv_flags &= ~IFF_BONDING; 1778 dev_close(slave_dev); 1779 1780 err_restore_mac: 1781 slave_dev->flags &= ~IFF_SLAVE; 1782 if (!bond->params.fail_over_mac || 1783 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1784 /* XXX TODO - fom follow mode needs to change master's 1785 * MAC if this slave's MAC is in use by the bond, or at 1786 * least print a warning. 1787 */ 1788 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr, 1789 new_slave->dev->addr_len); 1790 ss.ss_family = slave_dev->type; 1791 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss); 1792 } 1793 1794 err_restore_mtu: 1795 dev_set_mtu(slave_dev, new_slave->original_mtu); 1796 1797 err_free: 1798 bond_free_slave(new_slave); 1799 1800 err_undo_flags: 1801 /* Enslave of first slave has failed and we need to fix master's mac */ 1802 if (!bond_has_slaves(bond)) { 1803 if (ether_addr_equal_64bits(bond_dev->dev_addr, 1804 slave_dev->dev_addr)) 1805 eth_hw_addr_random(bond_dev); 1806 if (bond_dev->type != ARPHRD_ETHER) { 1807 dev_close(bond_dev); 1808 ether_setup(bond_dev); 1809 bond_dev->flags |= IFF_MASTER; 1810 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1811 } 1812 } 1813 1814 return res; 1815 } 1816 1817 /* Try to release the slave device <slave> from the bond device <master> 1818 * It is legal to access curr_active_slave without a lock because all the function 1819 * is RTNL-locked. If "all" is true it means that the function is being called 1820 * while destroying a bond interface and all slaves are being released. 1821 * 1822 * The rules for slave state should be: 1823 * for Active/Backup: 1824 * Active stays on all backups go down 1825 * for Bonded connections: 1826 * The first up interface should be left on and all others downed. 1827 */ 1828 static int __bond_release_one(struct net_device *bond_dev, 1829 struct net_device *slave_dev, 1830 bool all, bool unregister) 1831 { 1832 struct bonding *bond = netdev_priv(bond_dev); 1833 struct slave *slave, *oldcurrent; 1834 struct sockaddr_storage ss; 1835 int old_flags = bond_dev->flags; 1836 netdev_features_t old_features = bond_dev->features; 1837 1838 /* slave is not a slave or master is not master of this slave */ 1839 if (!(slave_dev->flags & IFF_SLAVE) || 1840 !netdev_has_upper_dev(slave_dev, bond_dev)) { 1841 netdev_dbg(bond_dev, "cannot release %s\n", 1842 slave_dev->name); 1843 return -EINVAL; 1844 } 1845 1846 block_netpoll_tx(); 1847 1848 slave = bond_get_slave_by_dev(bond, slave_dev); 1849 if (!slave) { 1850 /* not a slave of this bond */ 1851 netdev_info(bond_dev, "%s not enslaved\n", 1852 slave_dev->name); 1853 unblock_netpoll_tx(); 1854 return -EINVAL; 1855 } 1856 1857 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW); 1858 1859 bond_sysfs_slave_del(slave); 1860 1861 /* recompute stats just before removing the slave */ 1862 bond_get_stats(bond->dev, &bond->bond_stats); 1863 1864 bond_upper_dev_unlink(bond, slave); 1865 /* unregister rx_handler early so bond_handle_frame wouldn't be called 1866 * for this slave anymore. 1867 */ 1868 netdev_rx_handler_unregister(slave_dev); 1869 1870 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1871 bond_3ad_unbind_slave(slave); 1872 1873 if (bond_mode_uses_xmit_hash(bond)) 1874 bond_update_slave_arr(bond, slave); 1875 1876 netdev_info(bond_dev, "Releasing %s interface %s\n", 1877 bond_is_active_slave(slave) ? "active" : "backup", 1878 slave_dev->name); 1879 1880 oldcurrent = rcu_access_pointer(bond->curr_active_slave); 1881 1882 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 1883 1884 if (!all && (!bond->params.fail_over_mac || 1885 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) { 1886 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) && 1887 bond_has_slaves(bond)) 1888 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", 1889 slave_dev->name, slave->perm_hwaddr, 1890 bond_dev->name, slave_dev->name); 1891 } 1892 1893 if (rtnl_dereference(bond->primary_slave) == slave) 1894 RCU_INIT_POINTER(bond->primary_slave, NULL); 1895 1896 if (oldcurrent == slave) 1897 bond_change_active_slave(bond, NULL); 1898 1899 if (bond_is_lb(bond)) { 1900 /* Must be called only after the slave has been 1901 * detached from the list and the curr_active_slave 1902 * has been cleared (if our_slave == old_current), 1903 * but before a new active slave is selected. 1904 */ 1905 bond_alb_deinit_slave(bond, slave); 1906 } 1907 1908 if (all) { 1909 RCU_INIT_POINTER(bond->curr_active_slave, NULL); 1910 } else if (oldcurrent == slave) { 1911 /* Note that we hold RTNL over this sequence, so there 1912 * is no concern that another slave add/remove event 1913 * will interfere. 1914 */ 1915 bond_select_active_slave(bond); 1916 } 1917 1918 if (!bond_has_slaves(bond)) { 1919 bond_set_carrier(bond); 1920 eth_hw_addr_random(bond_dev); 1921 } 1922 1923 unblock_netpoll_tx(); 1924 synchronize_rcu(); 1925 bond->slave_cnt--; 1926 1927 if (!bond_has_slaves(bond)) { 1928 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 1929 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev); 1930 } 1931 1932 bond_compute_features(bond); 1933 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 1934 (old_features & NETIF_F_VLAN_CHALLENGED)) 1935 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n", 1936 slave_dev->name, bond_dev->name); 1937 1938 vlan_vids_del_by_dev(slave_dev, bond_dev); 1939 1940 /* If the mode uses primary, then this case was handled above by 1941 * bond_change_active_slave(..., NULL) 1942 */ 1943 if (!bond_uses_primary(bond)) { 1944 /* unset promiscuity level from slave 1945 * NOTE: The NETDEV_CHANGEADDR call above may change the value 1946 * of the IFF_PROMISC flag in the bond_dev, but we need the 1947 * value of that flag before that change, as that was the value 1948 * when this slave was attached, so we cache at the start of the 1949 * function and use it here. Same goes for ALLMULTI below 1950 */ 1951 if (old_flags & IFF_PROMISC) 1952 dev_set_promiscuity(slave_dev, -1); 1953 1954 /* unset allmulti level from slave */ 1955 if (old_flags & IFF_ALLMULTI) 1956 dev_set_allmulti(slave_dev, -1); 1957 1958 bond_hw_addr_flush(bond_dev, slave_dev); 1959 } 1960 1961 slave_disable_netpoll(slave); 1962 1963 /* close slave before restoring its mac address */ 1964 dev_close(slave_dev); 1965 1966 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE || 1967 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1968 /* restore original ("permanent") mac address */ 1969 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr, 1970 slave->dev->addr_len); 1971 ss.ss_family = slave_dev->type; 1972 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss); 1973 } 1974 1975 if (unregister) 1976 __dev_set_mtu(slave_dev, slave->original_mtu); 1977 else 1978 dev_set_mtu(slave_dev, slave->original_mtu); 1979 1980 slave_dev->priv_flags &= ~IFF_BONDING; 1981 1982 bond_free_slave(slave); 1983 1984 return 0; 1985 } 1986 1987 /* A wrapper used because of ndo_del_link */ 1988 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 1989 { 1990 return __bond_release_one(bond_dev, slave_dev, false, false); 1991 } 1992 1993 /* First release a slave and then destroy the bond if no more slaves are left. 1994 * Must be under rtnl_lock when this function is called. 1995 */ 1996 static int bond_release_and_destroy(struct net_device *bond_dev, 1997 struct net_device *slave_dev) 1998 { 1999 struct bonding *bond = netdev_priv(bond_dev); 2000 int ret; 2001 2002 ret = __bond_release_one(bond_dev, slave_dev, false, true); 2003 if (ret == 0 && !bond_has_slaves(bond)) { 2004 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 2005 netdev_info(bond_dev, "Destroying bond %s\n", 2006 bond_dev->name); 2007 bond_remove_proc_entry(bond); 2008 unregister_netdevice(bond_dev); 2009 } 2010 return ret; 2011 } 2012 2013 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info) 2014 { 2015 struct bonding *bond = netdev_priv(bond_dev); 2016 bond_fill_ifbond(bond, info); 2017 } 2018 2019 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 2020 { 2021 struct bonding *bond = netdev_priv(bond_dev); 2022 struct list_head *iter; 2023 int i = 0, res = -ENODEV; 2024 struct slave *slave; 2025 2026 bond_for_each_slave(bond, slave, iter) { 2027 if (i++ == (int)info->slave_id) { 2028 res = 0; 2029 bond_fill_ifslave(slave, info); 2030 break; 2031 } 2032 } 2033 2034 return res; 2035 } 2036 2037 /*-------------------------------- Monitoring -------------------------------*/ 2038 2039 /* called with rcu_read_lock() */ 2040 static int bond_miimon_inspect(struct bonding *bond) 2041 { 2042 int link_state, commit = 0; 2043 struct list_head *iter; 2044 struct slave *slave; 2045 bool ignore_updelay; 2046 2047 ignore_updelay = !rcu_dereference(bond->curr_active_slave); 2048 2049 bond_for_each_slave_rcu(bond, slave, iter) { 2050 slave->new_link = BOND_LINK_NOCHANGE; 2051 slave->link_new_state = slave->link; 2052 2053 link_state = bond_check_dev_link(bond, slave->dev, 0); 2054 2055 switch (slave->link) { 2056 case BOND_LINK_UP: 2057 if (link_state) 2058 continue; 2059 2060 bond_propose_link_state(slave, BOND_LINK_FAIL); 2061 commit++; 2062 slave->delay = bond->params.downdelay; 2063 if (slave->delay) { 2064 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n", 2065 (BOND_MODE(bond) == 2066 BOND_MODE_ACTIVEBACKUP) ? 2067 (bond_is_active_slave(slave) ? 2068 "active " : "backup ") : "", 2069 slave->dev->name, 2070 bond->params.downdelay * bond->params.miimon); 2071 } 2072 /*FALLTHRU*/ 2073 case BOND_LINK_FAIL: 2074 if (link_state) { 2075 /* recovered before downdelay expired */ 2076 bond_propose_link_state(slave, BOND_LINK_UP); 2077 slave->last_link_up = jiffies; 2078 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n", 2079 (bond->params.downdelay - slave->delay) * 2080 bond->params.miimon, 2081 slave->dev->name); 2082 commit++; 2083 continue; 2084 } 2085 2086 if (slave->delay <= 0) { 2087 slave->new_link = BOND_LINK_DOWN; 2088 commit++; 2089 continue; 2090 } 2091 2092 slave->delay--; 2093 break; 2094 2095 case BOND_LINK_DOWN: 2096 if (!link_state) 2097 continue; 2098 2099 bond_propose_link_state(slave, BOND_LINK_BACK); 2100 commit++; 2101 slave->delay = bond->params.updelay; 2102 2103 if (slave->delay) { 2104 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n", 2105 slave->dev->name, 2106 ignore_updelay ? 0 : 2107 bond->params.updelay * 2108 bond->params.miimon); 2109 } 2110 /*FALLTHRU*/ 2111 case BOND_LINK_BACK: 2112 if (!link_state) { 2113 bond_propose_link_state(slave, BOND_LINK_DOWN); 2114 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n", 2115 (bond->params.updelay - slave->delay) * 2116 bond->params.miimon, 2117 slave->dev->name); 2118 commit++; 2119 continue; 2120 } 2121 2122 if (ignore_updelay) 2123 slave->delay = 0; 2124 2125 if (slave->delay <= 0) { 2126 slave->new_link = BOND_LINK_UP; 2127 commit++; 2128 ignore_updelay = false; 2129 continue; 2130 } 2131 2132 slave->delay--; 2133 break; 2134 } 2135 } 2136 2137 return commit; 2138 } 2139 2140 static void bond_miimon_commit(struct bonding *bond) 2141 { 2142 struct list_head *iter; 2143 struct slave *slave, *primary; 2144 2145 bond_for_each_slave(bond, slave, iter) { 2146 switch (slave->new_link) { 2147 case BOND_LINK_NOCHANGE: 2148 continue; 2149 2150 case BOND_LINK_UP: 2151 if (bond_update_speed_duplex(slave) && 2152 bond_needs_speed_duplex(bond)) { 2153 slave->link = BOND_LINK_DOWN; 2154 if (net_ratelimit()) 2155 netdev_warn(bond->dev, 2156 "failed to get link speed/duplex for %s\n", 2157 slave->dev->name); 2158 continue; 2159 } 2160 bond_set_slave_link_state(slave, BOND_LINK_UP, 2161 BOND_SLAVE_NOTIFY_NOW); 2162 slave->last_link_up = jiffies; 2163 2164 primary = rtnl_dereference(bond->primary_slave); 2165 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 2166 /* prevent it from being the active one */ 2167 bond_set_backup_slave(slave); 2168 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2169 /* make it immediately active */ 2170 bond_set_active_slave(slave); 2171 } else if (slave != primary) { 2172 /* prevent it from being the active one */ 2173 bond_set_backup_slave(slave); 2174 } 2175 2176 netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n", 2177 slave->dev->name, 2178 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed, 2179 slave->duplex ? "full" : "half"); 2180 2181 /* notify ad that the link status has changed */ 2182 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2183 bond_3ad_handle_link_change(slave, BOND_LINK_UP); 2184 2185 if (bond_is_lb(bond)) 2186 bond_alb_handle_link_change(bond, slave, 2187 BOND_LINK_UP); 2188 2189 if (BOND_MODE(bond) == BOND_MODE_XOR) 2190 bond_update_slave_arr(bond, NULL); 2191 2192 if (!bond->curr_active_slave || slave == primary) 2193 goto do_failover; 2194 2195 continue; 2196 2197 case BOND_LINK_DOWN: 2198 if (slave->link_failure_count < UINT_MAX) 2199 slave->link_failure_count++; 2200 2201 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2202 BOND_SLAVE_NOTIFY_NOW); 2203 2204 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP || 2205 BOND_MODE(bond) == BOND_MODE_8023AD) 2206 bond_set_slave_inactive_flags(slave, 2207 BOND_SLAVE_NOTIFY_NOW); 2208 2209 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n", 2210 slave->dev->name); 2211 2212 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2213 bond_3ad_handle_link_change(slave, 2214 BOND_LINK_DOWN); 2215 2216 if (bond_is_lb(bond)) 2217 bond_alb_handle_link_change(bond, slave, 2218 BOND_LINK_DOWN); 2219 2220 if (BOND_MODE(bond) == BOND_MODE_XOR) 2221 bond_update_slave_arr(bond, NULL); 2222 2223 if (slave == rcu_access_pointer(bond->curr_active_slave)) 2224 goto do_failover; 2225 2226 continue; 2227 2228 default: 2229 netdev_err(bond->dev, "invalid new link %d on slave %s\n", 2230 slave->new_link, slave->dev->name); 2231 slave->new_link = BOND_LINK_NOCHANGE; 2232 2233 continue; 2234 } 2235 2236 do_failover: 2237 block_netpoll_tx(); 2238 bond_select_active_slave(bond); 2239 unblock_netpoll_tx(); 2240 } 2241 2242 bond_set_carrier(bond); 2243 } 2244 2245 /* bond_mii_monitor 2246 * 2247 * Really a wrapper that splits the mii monitor into two phases: an 2248 * inspection, then (if inspection indicates something needs to be done) 2249 * an acquisition of appropriate locks followed by a commit phase to 2250 * implement whatever link state changes are indicated. 2251 */ 2252 static void bond_mii_monitor(struct work_struct *work) 2253 { 2254 struct bonding *bond = container_of(work, struct bonding, 2255 mii_work.work); 2256 bool should_notify_peers = false; 2257 unsigned long delay; 2258 struct slave *slave; 2259 struct list_head *iter; 2260 2261 delay = msecs_to_jiffies(bond->params.miimon); 2262 2263 if (!bond_has_slaves(bond)) 2264 goto re_arm; 2265 2266 rcu_read_lock(); 2267 2268 should_notify_peers = bond_should_notify_peers(bond); 2269 2270 if (bond_miimon_inspect(bond)) { 2271 rcu_read_unlock(); 2272 2273 /* Race avoidance with bond_close cancel of workqueue */ 2274 if (!rtnl_trylock()) { 2275 delay = 1; 2276 should_notify_peers = false; 2277 goto re_arm; 2278 } 2279 2280 bond_for_each_slave(bond, slave, iter) { 2281 bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER); 2282 } 2283 bond_miimon_commit(bond); 2284 2285 rtnl_unlock(); /* might sleep, hold no other locks */ 2286 } else 2287 rcu_read_unlock(); 2288 2289 re_arm: 2290 if (bond->params.miimon) 2291 queue_delayed_work(bond->wq, &bond->mii_work, delay); 2292 2293 if (should_notify_peers) { 2294 if (!rtnl_trylock()) 2295 return; 2296 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); 2297 rtnl_unlock(); 2298 } 2299 } 2300 2301 static int bond_upper_dev_walk(struct net_device *upper, void *data) 2302 { 2303 __be32 ip = *((__be32 *)data); 2304 2305 return ip == bond_confirm_addr(upper, 0, ip); 2306 } 2307 2308 static bool bond_has_this_ip(struct bonding *bond, __be32 ip) 2309 { 2310 bool ret = false; 2311 2312 if (ip == bond_confirm_addr(bond->dev, 0, ip)) 2313 return true; 2314 2315 rcu_read_lock(); 2316 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &ip)) 2317 ret = true; 2318 rcu_read_unlock(); 2319 2320 return ret; 2321 } 2322 2323 /* We go to the (large) trouble of VLAN tagging ARP frames because 2324 * switches in VLAN mode (especially if ports are configured as 2325 * "native" to a VLAN) might not pass non-tagged frames. 2326 */ 2327 static void bond_arp_send(struct net_device *slave_dev, int arp_op, 2328 __be32 dest_ip, __be32 src_ip, 2329 struct bond_vlan_tag *tags) 2330 { 2331 struct sk_buff *skb; 2332 struct bond_vlan_tag *outer_tag = tags; 2333 2334 netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n", 2335 arp_op, slave_dev->name, &dest_ip, &src_ip); 2336 2337 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2338 NULL, slave_dev->dev_addr, NULL); 2339 2340 if (!skb) { 2341 net_err_ratelimited("ARP packet allocation failed\n"); 2342 return; 2343 } 2344 2345 if (!tags || tags->vlan_proto == VLAN_N_VID) 2346 goto xmit; 2347 2348 tags++; 2349 2350 /* Go through all the tags backwards and add them to the packet */ 2351 while (tags->vlan_proto != VLAN_N_VID) { 2352 if (!tags->vlan_id) { 2353 tags++; 2354 continue; 2355 } 2356 2357 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n", 2358 ntohs(outer_tag->vlan_proto), tags->vlan_id); 2359 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto, 2360 tags->vlan_id); 2361 if (!skb) { 2362 net_err_ratelimited("failed to insert inner VLAN tag\n"); 2363 return; 2364 } 2365 2366 tags++; 2367 } 2368 /* Set the outer tag */ 2369 if (outer_tag->vlan_id) { 2370 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n", 2371 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id); 2372 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto, 2373 outer_tag->vlan_id); 2374 } 2375 2376 xmit: 2377 arp_xmit(skb); 2378 } 2379 2380 /* Validate the device path between the @start_dev and the @end_dev. 2381 * The path is valid if the @end_dev is reachable through device 2382 * stacking. 2383 * When the path is validated, collect any vlan information in the 2384 * path. 2385 */ 2386 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev, 2387 struct net_device *end_dev, 2388 int level) 2389 { 2390 struct bond_vlan_tag *tags; 2391 struct net_device *upper; 2392 struct list_head *iter; 2393 2394 if (start_dev == end_dev) { 2395 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC); 2396 if (!tags) 2397 return ERR_PTR(-ENOMEM); 2398 tags[level].vlan_proto = VLAN_N_VID; 2399 return tags; 2400 } 2401 2402 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) { 2403 tags = bond_verify_device_path(upper, end_dev, level + 1); 2404 if (IS_ERR_OR_NULL(tags)) { 2405 if (IS_ERR(tags)) 2406 return tags; 2407 continue; 2408 } 2409 if (is_vlan_dev(upper)) { 2410 tags[level].vlan_proto = vlan_dev_vlan_proto(upper); 2411 tags[level].vlan_id = vlan_dev_vlan_id(upper); 2412 } 2413 2414 return tags; 2415 } 2416 2417 return NULL; 2418 } 2419 2420 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2421 { 2422 struct rtable *rt; 2423 struct bond_vlan_tag *tags; 2424 __be32 *targets = bond->params.arp_targets, addr; 2425 int i; 2426 2427 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) { 2428 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]); 2429 tags = NULL; 2430 2431 /* Find out through which dev should the packet go */ 2432 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 2433 RTO_ONLINK, 0); 2434 if (IS_ERR(rt)) { 2435 /* there's no route to target - try to send arp 2436 * probe to generate any traffic (arp_validate=0) 2437 */ 2438 if (bond->params.arp_validate) 2439 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n", 2440 bond->dev->name, 2441 &targets[i]); 2442 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2443 0, tags); 2444 continue; 2445 } 2446 2447 /* bond device itself */ 2448 if (rt->dst.dev == bond->dev) 2449 goto found; 2450 2451 rcu_read_lock(); 2452 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0); 2453 rcu_read_unlock(); 2454 2455 if (!IS_ERR_OR_NULL(tags)) 2456 goto found; 2457 2458 /* Not our device - skip */ 2459 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n", 2460 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL"); 2461 2462 ip_rt_put(rt); 2463 continue; 2464 2465 found: 2466 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0); 2467 ip_rt_put(rt); 2468 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2469 addr, tags); 2470 kfree(tags); 2471 } 2472 } 2473 2474 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 2475 { 2476 int i; 2477 2478 if (!sip || !bond_has_this_ip(bond, tip)) { 2479 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n", 2480 &sip, &tip); 2481 return; 2482 } 2483 2484 i = bond_get_targets_ip(bond->params.arp_targets, sip); 2485 if (i == -1) { 2486 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n", 2487 &sip); 2488 return; 2489 } 2490 slave->last_rx = jiffies; 2491 slave->target_last_arp_rx[i] = jiffies; 2492 } 2493 2494 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, 2495 struct slave *slave) 2496 { 2497 struct arphdr *arp = (struct arphdr *)skb->data; 2498 struct slave *curr_active_slave, *curr_arp_slave; 2499 unsigned char *arp_ptr; 2500 __be32 sip, tip; 2501 int is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP); 2502 unsigned int alen; 2503 2504 if (!slave_do_arp_validate(bond, slave)) { 2505 if ((slave_do_arp_validate_only(bond) && is_arp) || 2506 !slave_do_arp_validate_only(bond)) 2507 slave->last_rx = jiffies; 2508 return RX_HANDLER_ANOTHER; 2509 } else if (!is_arp) { 2510 return RX_HANDLER_ANOTHER; 2511 } 2512 2513 alen = arp_hdr_len(bond->dev); 2514 2515 netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n", 2516 skb->dev->name); 2517 2518 if (alen > skb_headlen(skb)) { 2519 arp = kmalloc(alen, GFP_ATOMIC); 2520 if (!arp) 2521 goto out_unlock; 2522 if (skb_copy_bits(skb, 0, arp, alen) < 0) 2523 goto out_unlock; 2524 } 2525 2526 if (arp->ar_hln != bond->dev->addr_len || 2527 skb->pkt_type == PACKET_OTHERHOST || 2528 skb->pkt_type == PACKET_LOOPBACK || 2529 arp->ar_hrd != htons(ARPHRD_ETHER) || 2530 arp->ar_pro != htons(ETH_P_IP) || 2531 arp->ar_pln != 4) 2532 goto out_unlock; 2533 2534 arp_ptr = (unsigned char *)(arp + 1); 2535 arp_ptr += bond->dev->addr_len; 2536 memcpy(&sip, arp_ptr, 4); 2537 arp_ptr += 4 + bond->dev->addr_len; 2538 memcpy(&tip, arp_ptr, 4); 2539 2540 netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n", 2541 slave->dev->name, bond_slave_state(slave), 2542 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 2543 &sip, &tip); 2544 2545 curr_active_slave = rcu_dereference(bond->curr_active_slave); 2546 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 2547 2548 /* We 'trust' the received ARP enough to validate it if: 2549 * 2550 * (a) the slave receiving the ARP is active (which includes the 2551 * current ARP slave, if any), or 2552 * 2553 * (b) the receiving slave isn't active, but there is a currently 2554 * active slave and it received valid arp reply(s) after it became 2555 * the currently active slave, or 2556 * 2557 * (c) there is an ARP slave that sent an ARP during the prior ARP 2558 * interval, and we receive an ARP reply on any slave. We accept 2559 * these because switch FDB update delays may deliver the ARP 2560 * reply to a slave other than the sender of the ARP request. 2561 * 2562 * Note: for (b), backup slaves are receiving the broadcast ARP 2563 * request, not a reply. This request passes from the sending 2564 * slave through the L2 switch(es) to the receiving slave. Since 2565 * this is checking the request, sip/tip are swapped for 2566 * validation. 2567 * 2568 * This is done to avoid endless looping when we can't reach the 2569 * arp_ip_target and fool ourselves with our own arp requests. 2570 */ 2571 if (bond_is_active_slave(slave)) 2572 bond_validate_arp(bond, slave, sip, tip); 2573 else if (curr_active_slave && 2574 time_after(slave_last_rx(bond, curr_active_slave), 2575 curr_active_slave->last_link_up)) 2576 bond_validate_arp(bond, slave, tip, sip); 2577 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) && 2578 bond_time_in_interval(bond, 2579 dev_trans_start(curr_arp_slave->dev), 1)) 2580 bond_validate_arp(bond, slave, sip, tip); 2581 2582 out_unlock: 2583 if (arp != (struct arphdr *)skb->data) 2584 kfree(arp); 2585 return RX_HANDLER_ANOTHER; 2586 } 2587 2588 /* function to verify if we're in the arp_interval timeslice, returns true if 2589 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval + 2590 * arp_interval/2) . the arp_interval/2 is needed for really fast networks. 2591 */ 2592 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 2593 int mod) 2594 { 2595 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2596 2597 return time_in_range(jiffies, 2598 last_act - delta_in_ticks, 2599 last_act + mod * delta_in_ticks + delta_in_ticks/2); 2600 } 2601 2602 /* This function is called regularly to monitor each slave's link 2603 * ensuring that traffic is being sent and received when arp monitoring 2604 * is used in load-balancing mode. if the adapter has been dormant, then an 2605 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 2606 * arp monitoring in active backup mode. 2607 */ 2608 static void bond_loadbalance_arp_mon(struct bonding *bond) 2609 { 2610 struct slave *slave, *oldcurrent; 2611 struct list_head *iter; 2612 int do_failover = 0, slave_state_changed = 0; 2613 2614 if (!bond_has_slaves(bond)) 2615 goto re_arm; 2616 2617 rcu_read_lock(); 2618 2619 oldcurrent = rcu_dereference(bond->curr_active_slave); 2620 /* see if any of the previous devices are up now (i.e. they have 2621 * xmt and rcv traffic). the curr_active_slave does not come into 2622 * the picture unless it is null. also, slave->last_link_up is not 2623 * needed here because we send an arp on each slave and give a slave 2624 * as long as it needs to get the tx/rx within the delta. 2625 * TODO: what about up/down delay in arp mode? it wasn't here before 2626 * so it can wait 2627 */ 2628 bond_for_each_slave_rcu(bond, slave, iter) { 2629 unsigned long trans_start = dev_trans_start(slave->dev); 2630 2631 slave->new_link = BOND_LINK_NOCHANGE; 2632 2633 if (slave->link != BOND_LINK_UP) { 2634 if (bond_time_in_interval(bond, trans_start, 1) && 2635 bond_time_in_interval(bond, slave->last_rx, 1)) { 2636 2637 slave->new_link = BOND_LINK_UP; 2638 slave_state_changed = 1; 2639 2640 /* primary_slave has no meaning in round-robin 2641 * mode. the window of a slave being up and 2642 * curr_active_slave being null after enslaving 2643 * is closed. 2644 */ 2645 if (!oldcurrent) { 2646 netdev_info(bond->dev, "link status definitely up for interface %s\n", 2647 slave->dev->name); 2648 do_failover = 1; 2649 } else { 2650 netdev_info(bond->dev, "interface %s is now up\n", 2651 slave->dev->name); 2652 } 2653 } 2654 } else { 2655 /* slave->link == BOND_LINK_UP */ 2656 2657 /* not all switches will respond to an arp request 2658 * when the source ip is 0, so don't take the link down 2659 * if we don't know our ip yet 2660 */ 2661 if (!bond_time_in_interval(bond, trans_start, 2) || 2662 !bond_time_in_interval(bond, slave->last_rx, 2)) { 2663 2664 slave->new_link = BOND_LINK_DOWN; 2665 slave_state_changed = 1; 2666 2667 if (slave->link_failure_count < UINT_MAX) 2668 slave->link_failure_count++; 2669 2670 netdev_info(bond->dev, "interface %s is now down\n", 2671 slave->dev->name); 2672 2673 if (slave == oldcurrent) 2674 do_failover = 1; 2675 } 2676 } 2677 2678 /* note: if switch is in round-robin mode, all links 2679 * must tx arp to ensure all links rx an arp - otherwise 2680 * links may oscillate or not come up at all; if switch is 2681 * in something like xor mode, there is nothing we can 2682 * do - all replies will be rx'ed on same link causing slaves 2683 * to be unstable during low/no traffic periods 2684 */ 2685 if (bond_slave_is_up(slave)) 2686 bond_arp_send_all(bond, slave); 2687 } 2688 2689 rcu_read_unlock(); 2690 2691 if (do_failover || slave_state_changed) { 2692 if (!rtnl_trylock()) 2693 goto re_arm; 2694 2695 bond_for_each_slave(bond, slave, iter) { 2696 if (slave->new_link != BOND_LINK_NOCHANGE) 2697 slave->link = slave->new_link; 2698 } 2699 2700 if (slave_state_changed) { 2701 bond_slave_state_change(bond); 2702 if (BOND_MODE(bond) == BOND_MODE_XOR) 2703 bond_update_slave_arr(bond, NULL); 2704 } 2705 if (do_failover) { 2706 block_netpoll_tx(); 2707 bond_select_active_slave(bond); 2708 unblock_netpoll_tx(); 2709 } 2710 rtnl_unlock(); 2711 } 2712 2713 re_arm: 2714 if (bond->params.arp_interval) 2715 queue_delayed_work(bond->wq, &bond->arp_work, 2716 msecs_to_jiffies(bond->params.arp_interval)); 2717 } 2718 2719 /* Called to inspect slaves for active-backup mode ARP monitor link state 2720 * changes. Sets new_link in slaves to specify what action should take 2721 * place for the slave. Returns 0 if no changes are found, >0 if changes 2722 * to link states must be committed. 2723 * 2724 * Called with rcu_read_lock held. 2725 */ 2726 static int bond_ab_arp_inspect(struct bonding *bond) 2727 { 2728 unsigned long trans_start, last_rx; 2729 struct list_head *iter; 2730 struct slave *slave; 2731 int commit = 0; 2732 2733 bond_for_each_slave_rcu(bond, slave, iter) { 2734 slave->new_link = BOND_LINK_NOCHANGE; 2735 last_rx = slave_last_rx(bond, slave); 2736 2737 if (slave->link != BOND_LINK_UP) { 2738 if (bond_time_in_interval(bond, last_rx, 1)) { 2739 slave->new_link = BOND_LINK_UP; 2740 commit++; 2741 } 2742 continue; 2743 } 2744 2745 /* Give slaves 2*delta after being enslaved or made 2746 * active. This avoids bouncing, as the last receive 2747 * times need a full ARP monitor cycle to be updated. 2748 */ 2749 if (bond_time_in_interval(bond, slave->last_link_up, 2)) 2750 continue; 2751 2752 /* Backup slave is down if: 2753 * - No current_arp_slave AND 2754 * - more than 3*delta since last receive AND 2755 * - the bond has an IP address 2756 * 2757 * Note: a non-null current_arp_slave indicates 2758 * the curr_active_slave went down and we are 2759 * searching for a new one; under this condition 2760 * we only take the curr_active_slave down - this 2761 * gives each slave a chance to tx/rx traffic 2762 * before being taken out 2763 */ 2764 if (!bond_is_active_slave(slave) && 2765 !rcu_access_pointer(bond->current_arp_slave) && 2766 !bond_time_in_interval(bond, last_rx, 3)) { 2767 slave->new_link = BOND_LINK_DOWN; 2768 commit++; 2769 } 2770 2771 /* Active slave is down if: 2772 * - more than 2*delta since transmitting OR 2773 * - (more than 2*delta since receive AND 2774 * the bond has an IP address) 2775 */ 2776 trans_start = dev_trans_start(slave->dev); 2777 if (bond_is_active_slave(slave) && 2778 (!bond_time_in_interval(bond, trans_start, 2) || 2779 !bond_time_in_interval(bond, last_rx, 2))) { 2780 slave->new_link = BOND_LINK_DOWN; 2781 commit++; 2782 } 2783 } 2784 2785 return commit; 2786 } 2787 2788 /* Called to commit link state changes noted by inspection step of 2789 * active-backup mode ARP monitor. 2790 * 2791 * Called with RTNL hold. 2792 */ 2793 static void bond_ab_arp_commit(struct bonding *bond) 2794 { 2795 unsigned long trans_start; 2796 struct list_head *iter; 2797 struct slave *slave; 2798 2799 bond_for_each_slave(bond, slave, iter) { 2800 switch (slave->new_link) { 2801 case BOND_LINK_NOCHANGE: 2802 continue; 2803 2804 case BOND_LINK_UP: 2805 trans_start = dev_trans_start(slave->dev); 2806 if (rtnl_dereference(bond->curr_active_slave) != slave || 2807 (!rtnl_dereference(bond->curr_active_slave) && 2808 bond_time_in_interval(bond, trans_start, 1))) { 2809 struct slave *current_arp_slave; 2810 2811 current_arp_slave = rtnl_dereference(bond->current_arp_slave); 2812 bond_set_slave_link_state(slave, BOND_LINK_UP, 2813 BOND_SLAVE_NOTIFY_NOW); 2814 if (current_arp_slave) { 2815 bond_set_slave_inactive_flags( 2816 current_arp_slave, 2817 BOND_SLAVE_NOTIFY_NOW); 2818 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2819 } 2820 2821 netdev_info(bond->dev, "link status definitely up for interface %s\n", 2822 slave->dev->name); 2823 2824 if (!rtnl_dereference(bond->curr_active_slave) || 2825 slave == rtnl_dereference(bond->primary_slave)) 2826 goto do_failover; 2827 2828 } 2829 2830 continue; 2831 2832 case BOND_LINK_DOWN: 2833 if (slave->link_failure_count < UINT_MAX) 2834 slave->link_failure_count++; 2835 2836 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2837 BOND_SLAVE_NOTIFY_NOW); 2838 bond_set_slave_inactive_flags(slave, 2839 BOND_SLAVE_NOTIFY_NOW); 2840 2841 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n", 2842 slave->dev->name); 2843 2844 if (slave == rtnl_dereference(bond->curr_active_slave)) { 2845 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2846 goto do_failover; 2847 } 2848 2849 continue; 2850 2851 default: 2852 netdev_err(bond->dev, "impossible: new_link %d on slave %s\n", 2853 slave->new_link, slave->dev->name); 2854 continue; 2855 } 2856 2857 do_failover: 2858 block_netpoll_tx(); 2859 bond_select_active_slave(bond); 2860 unblock_netpoll_tx(); 2861 } 2862 2863 bond_set_carrier(bond); 2864 } 2865 2866 /* Send ARP probes for active-backup mode ARP monitor. 2867 * 2868 * Called with rcu_read_lock held. 2869 */ 2870 static bool bond_ab_arp_probe(struct bonding *bond) 2871 { 2872 struct slave *slave, *before = NULL, *new_slave = NULL, 2873 *curr_arp_slave = rcu_dereference(bond->current_arp_slave), 2874 *curr_active_slave = rcu_dereference(bond->curr_active_slave); 2875 struct list_head *iter; 2876 bool found = false; 2877 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; 2878 2879 if (curr_arp_slave && curr_active_slave) 2880 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n", 2881 curr_arp_slave->dev->name, 2882 curr_active_slave->dev->name); 2883 2884 if (curr_active_slave) { 2885 bond_arp_send_all(bond, curr_active_slave); 2886 return should_notify_rtnl; 2887 } 2888 2889 /* if we don't have a curr_active_slave, search for the next available 2890 * backup slave from the current_arp_slave and make it the candidate 2891 * for becoming the curr_active_slave 2892 */ 2893 2894 if (!curr_arp_slave) { 2895 curr_arp_slave = bond_first_slave_rcu(bond); 2896 if (!curr_arp_slave) 2897 return should_notify_rtnl; 2898 } 2899 2900 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER); 2901 2902 bond_for_each_slave_rcu(bond, slave, iter) { 2903 if (!found && !before && bond_slave_is_up(slave)) 2904 before = slave; 2905 2906 if (found && !new_slave && bond_slave_is_up(slave)) 2907 new_slave = slave; 2908 /* if the link state is up at this point, we 2909 * mark it down - this can happen if we have 2910 * simultaneous link failures and 2911 * reselect_active_interface doesn't make this 2912 * one the current slave so it is still marked 2913 * up when it is actually down 2914 */ 2915 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 2916 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2917 BOND_SLAVE_NOTIFY_LATER); 2918 if (slave->link_failure_count < UINT_MAX) 2919 slave->link_failure_count++; 2920 2921 bond_set_slave_inactive_flags(slave, 2922 BOND_SLAVE_NOTIFY_LATER); 2923 2924 netdev_info(bond->dev, "backup interface %s is now down\n", 2925 slave->dev->name); 2926 } 2927 if (slave == curr_arp_slave) 2928 found = true; 2929 } 2930 2931 if (!new_slave && before) 2932 new_slave = before; 2933 2934 if (!new_slave) 2935 goto check_state; 2936 2937 bond_set_slave_link_state(new_slave, BOND_LINK_BACK, 2938 BOND_SLAVE_NOTIFY_LATER); 2939 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER); 2940 bond_arp_send_all(bond, new_slave); 2941 new_slave->last_link_up = jiffies; 2942 rcu_assign_pointer(bond->current_arp_slave, new_slave); 2943 2944 check_state: 2945 bond_for_each_slave_rcu(bond, slave, iter) { 2946 if (slave->should_notify || slave->should_notify_link) { 2947 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; 2948 break; 2949 } 2950 } 2951 return should_notify_rtnl; 2952 } 2953 2954 static void bond_activebackup_arp_mon(struct bonding *bond) 2955 { 2956 bool should_notify_peers = false; 2957 bool should_notify_rtnl = false; 2958 int delta_in_ticks; 2959 2960 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2961 2962 if (!bond_has_slaves(bond)) 2963 goto re_arm; 2964 2965 rcu_read_lock(); 2966 2967 should_notify_peers = bond_should_notify_peers(bond); 2968 2969 if (bond_ab_arp_inspect(bond)) { 2970 rcu_read_unlock(); 2971 2972 /* Race avoidance with bond_close flush of workqueue */ 2973 if (!rtnl_trylock()) { 2974 delta_in_ticks = 1; 2975 should_notify_peers = false; 2976 goto re_arm; 2977 } 2978 2979 bond_ab_arp_commit(bond); 2980 2981 rtnl_unlock(); 2982 rcu_read_lock(); 2983 } 2984 2985 should_notify_rtnl = bond_ab_arp_probe(bond); 2986 rcu_read_unlock(); 2987 2988 re_arm: 2989 if (bond->params.arp_interval) 2990 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 2991 2992 if (should_notify_peers || should_notify_rtnl) { 2993 if (!rtnl_trylock()) 2994 return; 2995 2996 if (should_notify_peers) 2997 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 2998 bond->dev); 2999 if (should_notify_rtnl) { 3000 bond_slave_state_notify(bond); 3001 bond_slave_link_notify(bond); 3002 } 3003 3004 rtnl_unlock(); 3005 } 3006 } 3007 3008 static void bond_arp_monitor(struct work_struct *work) 3009 { 3010 struct bonding *bond = container_of(work, struct bonding, 3011 arp_work.work); 3012 3013 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3014 bond_activebackup_arp_mon(bond); 3015 else 3016 bond_loadbalance_arp_mon(bond); 3017 } 3018 3019 /*-------------------------- netdev event handling --------------------------*/ 3020 3021 /* Change device name */ 3022 static int bond_event_changename(struct bonding *bond) 3023 { 3024 bond_remove_proc_entry(bond); 3025 bond_create_proc_entry(bond); 3026 3027 bond_debug_reregister(bond); 3028 3029 return NOTIFY_DONE; 3030 } 3031 3032 static int bond_master_netdev_event(unsigned long event, 3033 struct net_device *bond_dev) 3034 { 3035 struct bonding *event_bond = netdev_priv(bond_dev); 3036 3037 switch (event) { 3038 case NETDEV_CHANGENAME: 3039 return bond_event_changename(event_bond); 3040 case NETDEV_UNREGISTER: 3041 bond_remove_proc_entry(event_bond); 3042 break; 3043 case NETDEV_REGISTER: 3044 bond_create_proc_entry(event_bond); 3045 break; 3046 case NETDEV_NOTIFY_PEERS: 3047 if (event_bond->send_peer_notif) 3048 event_bond->send_peer_notif--; 3049 break; 3050 default: 3051 break; 3052 } 3053 3054 return NOTIFY_DONE; 3055 } 3056 3057 static int bond_slave_netdev_event(unsigned long event, 3058 struct net_device *slave_dev) 3059 { 3060 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary; 3061 struct bonding *bond; 3062 struct net_device *bond_dev; 3063 3064 /* A netdev event can be generated while enslaving a device 3065 * before netdev_rx_handler_register is called in which case 3066 * slave will be NULL 3067 */ 3068 if (!slave) 3069 return NOTIFY_DONE; 3070 bond_dev = slave->bond->dev; 3071 bond = slave->bond; 3072 primary = rtnl_dereference(bond->primary_slave); 3073 3074 switch (event) { 3075 case NETDEV_UNREGISTER: 3076 if (bond_dev->type != ARPHRD_ETHER) 3077 bond_release_and_destroy(bond_dev, slave_dev); 3078 else 3079 __bond_release_one(bond_dev, slave_dev, false, true); 3080 break; 3081 case NETDEV_UP: 3082 case NETDEV_CHANGE: 3083 /* For 802.3ad mode only: 3084 * Getting invalid Speed/Duplex values here will put slave 3085 * in weird state. So mark it as link-down for the time 3086 * being and let link-monitoring (miimon) set it right when 3087 * correct speeds/duplex are available. 3088 */ 3089 if (bond_update_speed_duplex(slave) && 3090 BOND_MODE(bond) == BOND_MODE_8023AD) 3091 slave->link = BOND_LINK_DOWN; 3092 3093 if (BOND_MODE(bond) == BOND_MODE_8023AD) 3094 bond_3ad_adapter_speed_duplex_changed(slave); 3095 /* Fallthrough */ 3096 case NETDEV_DOWN: 3097 /* Refresh slave-array if applicable! 3098 * If the setup does not use miimon or arpmon (mode-specific!), 3099 * then these events will not cause the slave-array to be 3100 * refreshed. This will cause xmit to use a slave that is not 3101 * usable. Avoid such situation by refeshing the array at these 3102 * events. If these (miimon/arpmon) parameters are configured 3103 * then array gets refreshed twice and that should be fine! 3104 */ 3105 if (bond_mode_uses_xmit_hash(bond)) 3106 bond_update_slave_arr(bond, NULL); 3107 break; 3108 case NETDEV_CHANGEMTU: 3109 /* TODO: Should slaves be allowed to 3110 * independently alter their MTU? For 3111 * an active-backup bond, slaves need 3112 * not be the same type of device, so 3113 * MTUs may vary. For other modes, 3114 * slaves arguably should have the 3115 * same MTUs. To do this, we'd need to 3116 * take over the slave's change_mtu 3117 * function for the duration of their 3118 * servitude. 3119 */ 3120 break; 3121 case NETDEV_CHANGENAME: 3122 /* we don't care if we don't have primary set */ 3123 if (!bond_uses_primary(bond) || 3124 !bond->params.primary[0]) 3125 break; 3126 3127 if (slave == primary) { 3128 /* slave's name changed - he's no longer primary */ 3129 RCU_INIT_POINTER(bond->primary_slave, NULL); 3130 } else if (!strcmp(slave_dev->name, bond->params.primary)) { 3131 /* we have a new primary slave */ 3132 rcu_assign_pointer(bond->primary_slave, slave); 3133 } else { /* we didn't change primary - exit */ 3134 break; 3135 } 3136 3137 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n", 3138 primary ? slave_dev->name : "none"); 3139 3140 block_netpoll_tx(); 3141 bond_select_active_slave(bond); 3142 unblock_netpoll_tx(); 3143 break; 3144 case NETDEV_FEAT_CHANGE: 3145 bond_compute_features(bond); 3146 break; 3147 case NETDEV_RESEND_IGMP: 3148 /* Propagate to master device */ 3149 call_netdevice_notifiers(event, slave->bond->dev); 3150 break; 3151 default: 3152 break; 3153 } 3154 3155 return NOTIFY_DONE; 3156 } 3157 3158 /* bond_netdev_event: handle netdev notifier chain events. 3159 * 3160 * This function receives events for the netdev chain. The caller (an 3161 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 3162 * locks for us to safely manipulate the slave devices (RTNL lock, 3163 * dev_probe_lock). 3164 */ 3165 static int bond_netdev_event(struct notifier_block *this, 3166 unsigned long event, void *ptr) 3167 { 3168 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 3169 3170 netdev_dbg(event_dev, "event: %lx\n", event); 3171 3172 if (!(event_dev->priv_flags & IFF_BONDING)) 3173 return NOTIFY_DONE; 3174 3175 if (event_dev->flags & IFF_MASTER) { 3176 netdev_dbg(event_dev, "IFF_MASTER\n"); 3177 return bond_master_netdev_event(event, event_dev); 3178 } 3179 3180 if (event_dev->flags & IFF_SLAVE) { 3181 netdev_dbg(event_dev, "IFF_SLAVE\n"); 3182 return bond_slave_netdev_event(event, event_dev); 3183 } 3184 3185 return NOTIFY_DONE; 3186 } 3187 3188 static struct notifier_block bond_netdev_notifier = { 3189 .notifier_call = bond_netdev_event, 3190 }; 3191 3192 /*---------------------------- Hashing Policies -----------------------------*/ 3193 3194 /* L2 hash helper */ 3195 static inline u32 bond_eth_hash(struct sk_buff *skb) 3196 { 3197 struct ethhdr *ep, hdr_tmp; 3198 3199 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp); 3200 if (ep) 3201 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto; 3202 return 0; 3203 } 3204 3205 /* Extract the appropriate headers based on bond's xmit policy */ 3206 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, 3207 struct flow_keys *fk) 3208 { 3209 const struct ipv6hdr *iph6; 3210 const struct iphdr *iph; 3211 int noff, proto = -1; 3212 3213 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23) 3214 return skb_flow_dissect_flow_keys(skb, fk, 0); 3215 3216 fk->ports.ports = 0; 3217 noff = skb_network_offset(skb); 3218 if (skb->protocol == htons(ETH_P_IP)) { 3219 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph)))) 3220 return false; 3221 iph = ip_hdr(skb); 3222 iph_to_flow_copy_v4addrs(fk, iph); 3223 noff += iph->ihl << 2; 3224 if (!ip_is_fragment(iph)) 3225 proto = iph->protocol; 3226 } else if (skb->protocol == htons(ETH_P_IPV6)) { 3227 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6)))) 3228 return false; 3229 iph6 = ipv6_hdr(skb); 3230 iph_to_flow_copy_v6addrs(fk, iph6); 3231 noff += sizeof(*iph6); 3232 proto = iph6->nexthdr; 3233 } else { 3234 return false; 3235 } 3236 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0) 3237 fk->ports.ports = skb_flow_get_ports(skb, noff, proto); 3238 3239 return true; 3240 } 3241 3242 /** 3243 * bond_xmit_hash - generate a hash value based on the xmit policy 3244 * @bond: bonding device 3245 * @skb: buffer to use for headers 3246 * 3247 * This function will extract the necessary headers from the skb buffer and use 3248 * them to generate a hash based on the xmit_policy set in the bonding device 3249 */ 3250 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb) 3251 { 3252 struct flow_keys flow; 3253 u32 hash; 3254 3255 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 && 3256 skb->l4_hash) 3257 return skb->hash; 3258 3259 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 || 3260 !bond_flow_dissect(bond, skb, &flow)) 3261 return bond_eth_hash(skb); 3262 3263 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 || 3264 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) 3265 hash = bond_eth_hash(skb); 3266 else 3267 hash = (__force u32)flow.ports.ports; 3268 hash ^= (__force u32)flow_get_u32_dst(&flow) ^ 3269 (__force u32)flow_get_u32_src(&flow); 3270 hash ^= (hash >> 16); 3271 hash ^= (hash >> 8); 3272 3273 return hash >> 1; 3274 } 3275 3276 /*-------------------------- Device entry points ----------------------------*/ 3277 3278 void bond_work_init_all(struct bonding *bond) 3279 { 3280 INIT_DELAYED_WORK(&bond->mcast_work, 3281 bond_resend_igmp_join_requests_delayed); 3282 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 3283 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 3284 INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor); 3285 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 3286 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler); 3287 } 3288 3289 static void bond_work_cancel_all(struct bonding *bond) 3290 { 3291 cancel_delayed_work_sync(&bond->mii_work); 3292 cancel_delayed_work_sync(&bond->arp_work); 3293 cancel_delayed_work_sync(&bond->alb_work); 3294 cancel_delayed_work_sync(&bond->ad_work); 3295 cancel_delayed_work_sync(&bond->mcast_work); 3296 cancel_delayed_work_sync(&bond->slave_arr_work); 3297 } 3298 3299 static int bond_open(struct net_device *bond_dev) 3300 { 3301 struct bonding *bond = netdev_priv(bond_dev); 3302 struct list_head *iter; 3303 struct slave *slave; 3304 3305 /* reset slave->backup and slave->inactive */ 3306 if (bond_has_slaves(bond)) { 3307 bond_for_each_slave(bond, slave, iter) { 3308 if (bond_uses_primary(bond) && 3309 slave != rcu_access_pointer(bond->curr_active_slave)) { 3310 bond_set_slave_inactive_flags(slave, 3311 BOND_SLAVE_NOTIFY_NOW); 3312 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) { 3313 bond_set_slave_active_flags(slave, 3314 BOND_SLAVE_NOTIFY_NOW); 3315 } 3316 } 3317 } 3318 3319 if (bond_is_lb(bond)) { 3320 /* bond_alb_initialize must be called before the timer 3321 * is started. 3322 */ 3323 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB))) 3324 return -ENOMEM; 3325 if (bond->params.tlb_dynamic_lb) 3326 queue_delayed_work(bond->wq, &bond->alb_work, 0); 3327 } 3328 3329 if (bond->params.miimon) /* link check interval, in milliseconds. */ 3330 queue_delayed_work(bond->wq, &bond->mii_work, 0); 3331 3332 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 3333 queue_delayed_work(bond->wq, &bond->arp_work, 0); 3334 bond->recv_probe = bond_arp_rcv; 3335 } 3336 3337 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3338 queue_delayed_work(bond->wq, &bond->ad_work, 0); 3339 /* register to receive LACPDUs */ 3340 bond->recv_probe = bond_3ad_lacpdu_recv; 3341 bond_3ad_initiate_agg_selection(bond, 1); 3342 } 3343 3344 if (bond_mode_uses_xmit_hash(bond)) 3345 bond_update_slave_arr(bond, NULL); 3346 3347 return 0; 3348 } 3349 3350 static int bond_close(struct net_device *bond_dev) 3351 { 3352 struct bonding *bond = netdev_priv(bond_dev); 3353 3354 bond_work_cancel_all(bond); 3355 bond->send_peer_notif = 0; 3356 if (bond_is_lb(bond)) 3357 bond_alb_deinitialize(bond); 3358 bond->recv_probe = NULL; 3359 3360 return 0; 3361 } 3362 3363 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but 3364 * that some drivers can provide 32bit values only. 3365 */ 3366 static void bond_fold_stats(struct rtnl_link_stats64 *_res, 3367 const struct rtnl_link_stats64 *_new, 3368 const struct rtnl_link_stats64 *_old) 3369 { 3370 const u64 *new = (const u64 *)_new; 3371 const u64 *old = (const u64 *)_old; 3372 u64 *res = (u64 *)_res; 3373 int i; 3374 3375 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) { 3376 u64 nv = new[i]; 3377 u64 ov = old[i]; 3378 s64 delta = nv - ov; 3379 3380 /* detects if this particular field is 32bit only */ 3381 if (((nv | ov) >> 32) == 0) 3382 delta = (s64)(s32)((u32)nv - (u32)ov); 3383 3384 /* filter anomalies, some drivers reset their stats 3385 * at down/up events. 3386 */ 3387 if (delta > 0) 3388 res[i] += delta; 3389 } 3390 } 3391 3392 static void bond_get_stats(struct net_device *bond_dev, 3393 struct rtnl_link_stats64 *stats) 3394 { 3395 struct bonding *bond = netdev_priv(bond_dev); 3396 struct rtnl_link_stats64 temp; 3397 struct list_head *iter; 3398 struct slave *slave; 3399 3400 spin_lock(&bond->stats_lock); 3401 memcpy(stats, &bond->bond_stats, sizeof(*stats)); 3402 3403 rcu_read_lock(); 3404 bond_for_each_slave_rcu(bond, slave, iter) { 3405 const struct rtnl_link_stats64 *new = 3406 dev_get_stats(slave->dev, &temp); 3407 3408 bond_fold_stats(stats, new, &slave->slave_stats); 3409 3410 /* save off the slave stats for the next run */ 3411 memcpy(&slave->slave_stats, new, sizeof(*new)); 3412 } 3413 rcu_read_unlock(); 3414 3415 memcpy(&bond->bond_stats, stats, sizeof(*stats)); 3416 spin_unlock(&bond->stats_lock); 3417 } 3418 3419 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 3420 { 3421 struct bonding *bond = netdev_priv(bond_dev); 3422 struct net_device *slave_dev = NULL; 3423 struct ifbond k_binfo; 3424 struct ifbond __user *u_binfo = NULL; 3425 struct ifslave k_sinfo; 3426 struct ifslave __user *u_sinfo = NULL; 3427 struct mii_ioctl_data *mii = NULL; 3428 struct bond_opt_value newval; 3429 struct net *net; 3430 int res = 0; 3431 3432 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd); 3433 3434 switch (cmd) { 3435 case SIOCGMIIPHY: 3436 mii = if_mii(ifr); 3437 if (!mii) 3438 return -EINVAL; 3439 3440 mii->phy_id = 0; 3441 /* Fall Through */ 3442 case SIOCGMIIREG: 3443 /* We do this again just in case we were called by SIOCGMIIREG 3444 * instead of SIOCGMIIPHY. 3445 */ 3446 mii = if_mii(ifr); 3447 if (!mii) 3448 return -EINVAL; 3449 3450 if (mii->reg_num == 1) { 3451 mii->val_out = 0; 3452 if (netif_carrier_ok(bond->dev)) 3453 mii->val_out = BMSR_LSTATUS; 3454 } 3455 3456 return 0; 3457 case BOND_INFO_QUERY_OLD: 3458 case SIOCBONDINFOQUERY: 3459 u_binfo = (struct ifbond __user *)ifr->ifr_data; 3460 3461 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 3462 return -EFAULT; 3463 3464 bond_info_query(bond_dev, &k_binfo); 3465 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 3466 return -EFAULT; 3467 3468 return 0; 3469 case BOND_SLAVE_INFO_QUERY_OLD: 3470 case SIOCBONDSLAVEINFOQUERY: 3471 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 3472 3473 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 3474 return -EFAULT; 3475 3476 res = bond_slave_info_query(bond_dev, &k_sinfo); 3477 if (res == 0 && 3478 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 3479 return -EFAULT; 3480 3481 return res; 3482 default: 3483 break; 3484 } 3485 3486 net = dev_net(bond_dev); 3487 3488 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3489 return -EPERM; 3490 3491 slave_dev = __dev_get_by_name(net, ifr->ifr_slave); 3492 3493 netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev); 3494 3495 if (!slave_dev) 3496 return -ENODEV; 3497 3498 netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name); 3499 switch (cmd) { 3500 case BOND_ENSLAVE_OLD: 3501 case SIOCBONDENSLAVE: 3502 res = bond_enslave(bond_dev, slave_dev, NULL); 3503 break; 3504 case BOND_RELEASE_OLD: 3505 case SIOCBONDRELEASE: 3506 res = bond_release(bond_dev, slave_dev); 3507 break; 3508 case BOND_SETHWADDR_OLD: 3509 case SIOCBONDSETHWADDR: 3510 bond_set_dev_addr(bond_dev, slave_dev); 3511 res = 0; 3512 break; 3513 case BOND_CHANGE_ACTIVE_OLD: 3514 case SIOCBONDCHANGEACTIVE: 3515 bond_opt_initstr(&newval, slave_dev->name); 3516 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE, 3517 &newval); 3518 break; 3519 default: 3520 res = -EOPNOTSUPP; 3521 } 3522 3523 return res; 3524 } 3525 3526 static void bond_change_rx_flags(struct net_device *bond_dev, int change) 3527 { 3528 struct bonding *bond = netdev_priv(bond_dev); 3529 3530 if (change & IFF_PROMISC) 3531 bond_set_promiscuity(bond, 3532 bond_dev->flags & IFF_PROMISC ? 1 : -1); 3533 3534 if (change & IFF_ALLMULTI) 3535 bond_set_allmulti(bond, 3536 bond_dev->flags & IFF_ALLMULTI ? 1 : -1); 3537 } 3538 3539 static void bond_set_rx_mode(struct net_device *bond_dev) 3540 { 3541 struct bonding *bond = netdev_priv(bond_dev); 3542 struct list_head *iter; 3543 struct slave *slave; 3544 3545 rcu_read_lock(); 3546 if (bond_uses_primary(bond)) { 3547 slave = rcu_dereference(bond->curr_active_slave); 3548 if (slave) { 3549 dev_uc_sync(slave->dev, bond_dev); 3550 dev_mc_sync(slave->dev, bond_dev); 3551 } 3552 } else { 3553 bond_for_each_slave_rcu(bond, slave, iter) { 3554 dev_uc_sync_multiple(slave->dev, bond_dev); 3555 dev_mc_sync_multiple(slave->dev, bond_dev); 3556 } 3557 } 3558 rcu_read_unlock(); 3559 } 3560 3561 static int bond_neigh_init(struct neighbour *n) 3562 { 3563 struct bonding *bond = netdev_priv(n->dev); 3564 const struct net_device_ops *slave_ops; 3565 struct neigh_parms parms; 3566 struct slave *slave; 3567 int ret; 3568 3569 slave = bond_first_slave(bond); 3570 if (!slave) 3571 return 0; 3572 slave_ops = slave->dev->netdev_ops; 3573 if (!slave_ops->ndo_neigh_setup) 3574 return 0; 3575 3576 parms.neigh_setup = NULL; 3577 parms.neigh_cleanup = NULL; 3578 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); 3579 if (ret) 3580 return ret; 3581 3582 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called 3583 * after the last slave has been detached. Assumes that all slaves 3584 * utilize the same neigh_cleanup (true at this writing as only user 3585 * is ipoib). 3586 */ 3587 n->parms->neigh_cleanup = parms.neigh_cleanup; 3588 3589 if (!parms.neigh_setup) 3590 return 0; 3591 3592 return parms.neigh_setup(n); 3593 } 3594 3595 /* The bonding ndo_neigh_setup is called at init time beofre any 3596 * slave exists. So we must declare proxy setup function which will 3597 * be used at run time to resolve the actual slave neigh param setup. 3598 * 3599 * It's also called by master devices (such as vlans) to setup their 3600 * underlying devices. In that case - do nothing, we're already set up from 3601 * our init. 3602 */ 3603 static int bond_neigh_setup(struct net_device *dev, 3604 struct neigh_parms *parms) 3605 { 3606 /* modify only our neigh_parms */ 3607 if (parms->dev == dev) 3608 parms->neigh_setup = bond_neigh_init; 3609 3610 return 0; 3611 } 3612 3613 /* Change the MTU of all of a master's slaves to match the master */ 3614 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 3615 { 3616 struct bonding *bond = netdev_priv(bond_dev); 3617 struct slave *slave, *rollback_slave; 3618 struct list_head *iter; 3619 int res = 0; 3620 3621 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu); 3622 3623 bond_for_each_slave(bond, slave, iter) { 3624 netdev_dbg(bond_dev, "s %p c_m %p\n", 3625 slave, slave->dev->netdev_ops->ndo_change_mtu); 3626 3627 res = dev_set_mtu(slave->dev, new_mtu); 3628 3629 if (res) { 3630 /* If we failed to set the slave's mtu to the new value 3631 * we must abort the operation even in ACTIVE_BACKUP 3632 * mode, because if we allow the backup slaves to have 3633 * different mtu values than the active slave we'll 3634 * need to change their mtu when doing a failover. That 3635 * means changing their mtu from timer context, which 3636 * is probably not a good idea. 3637 */ 3638 netdev_dbg(bond_dev, "err %d %s\n", res, 3639 slave->dev->name); 3640 goto unwind; 3641 } 3642 } 3643 3644 bond_dev->mtu = new_mtu; 3645 3646 return 0; 3647 3648 unwind: 3649 /* unwind from head to the slave that failed */ 3650 bond_for_each_slave(bond, rollback_slave, iter) { 3651 int tmp_res; 3652 3653 if (rollback_slave == slave) 3654 break; 3655 3656 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu); 3657 if (tmp_res) { 3658 netdev_dbg(bond_dev, "unwind err %d dev %s\n", 3659 tmp_res, rollback_slave->dev->name); 3660 } 3661 } 3662 3663 return res; 3664 } 3665 3666 /* Change HW address 3667 * 3668 * Note that many devices must be down to change the HW address, and 3669 * downing the master releases all slaves. We can make bonds full of 3670 * bonding devices to test this, however. 3671 */ 3672 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 3673 { 3674 struct bonding *bond = netdev_priv(bond_dev); 3675 struct slave *slave, *rollback_slave; 3676 struct sockaddr_storage *ss = addr, tmp_ss; 3677 struct list_head *iter; 3678 int res = 0; 3679 3680 if (BOND_MODE(bond) == BOND_MODE_ALB) 3681 return bond_alb_set_mac_address(bond_dev, addr); 3682 3683 3684 netdev_dbg(bond_dev, "bond=%p\n", bond); 3685 3686 /* If fail_over_mac is enabled, do nothing and return success. 3687 * Returning an error causes ifenslave to fail. 3688 */ 3689 if (bond->params.fail_over_mac && 3690 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3691 return 0; 3692 3693 if (!is_valid_ether_addr(ss->__data)) 3694 return -EADDRNOTAVAIL; 3695 3696 bond_for_each_slave(bond, slave, iter) { 3697 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name); 3698 res = dev_set_mac_address(slave->dev, addr); 3699 if (res) { 3700 /* TODO: consider downing the slave 3701 * and retry ? 3702 * User should expect communications 3703 * breakage anyway until ARP finish 3704 * updating, so... 3705 */ 3706 netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name); 3707 goto unwind; 3708 } 3709 } 3710 3711 /* success */ 3712 memcpy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len); 3713 return 0; 3714 3715 unwind: 3716 memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 3717 tmp_ss.ss_family = bond_dev->type; 3718 3719 /* unwind from head to the slave that failed */ 3720 bond_for_each_slave(bond, rollback_slave, iter) { 3721 int tmp_res; 3722 3723 if (rollback_slave == slave) 3724 break; 3725 3726 tmp_res = dev_set_mac_address(rollback_slave->dev, 3727 (struct sockaddr *)&tmp_ss); 3728 if (tmp_res) { 3729 netdev_dbg(bond_dev, "unwind err %d dev %s\n", 3730 tmp_res, rollback_slave->dev->name); 3731 } 3732 } 3733 3734 return res; 3735 } 3736 3737 /** 3738 * bond_xmit_slave_id - transmit skb through slave with slave_id 3739 * @bond: bonding device that is transmitting 3740 * @skb: buffer to transmit 3741 * @slave_id: slave id up to slave_cnt-1 through which to transmit 3742 * 3743 * This function tries to transmit through slave with slave_id but in case 3744 * it fails, it tries to find the first available slave for transmission. 3745 * The skb is consumed in all cases, thus the function is void. 3746 */ 3747 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id) 3748 { 3749 struct list_head *iter; 3750 struct slave *slave; 3751 int i = slave_id; 3752 3753 /* Here we start from the slave with slave_id */ 3754 bond_for_each_slave_rcu(bond, slave, iter) { 3755 if (--i < 0) { 3756 if (bond_slave_can_tx(slave)) { 3757 bond_dev_queue_xmit(bond, skb, slave->dev); 3758 return; 3759 } 3760 } 3761 } 3762 3763 /* Here we start from the first slave up to slave_id */ 3764 i = slave_id; 3765 bond_for_each_slave_rcu(bond, slave, iter) { 3766 if (--i < 0) 3767 break; 3768 if (bond_slave_can_tx(slave)) { 3769 bond_dev_queue_xmit(bond, skb, slave->dev); 3770 return; 3771 } 3772 } 3773 /* no slave that can tx has been found */ 3774 bond_tx_drop(bond->dev, skb); 3775 } 3776 3777 /** 3778 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave 3779 * @bond: bonding device to use 3780 * 3781 * Based on the value of the bonding device's packets_per_slave parameter 3782 * this function generates a slave id, which is usually used as the next 3783 * slave to transmit through. 3784 */ 3785 static u32 bond_rr_gen_slave_id(struct bonding *bond) 3786 { 3787 u32 slave_id; 3788 struct reciprocal_value reciprocal_packets_per_slave; 3789 int packets_per_slave = bond->params.packets_per_slave; 3790 3791 switch (packets_per_slave) { 3792 case 0: 3793 slave_id = prandom_u32(); 3794 break; 3795 case 1: 3796 slave_id = bond->rr_tx_counter; 3797 break; 3798 default: 3799 reciprocal_packets_per_slave = 3800 bond->params.reciprocal_packets_per_slave; 3801 slave_id = reciprocal_divide(bond->rr_tx_counter, 3802 reciprocal_packets_per_slave); 3803 break; 3804 } 3805 bond->rr_tx_counter++; 3806 3807 return slave_id; 3808 } 3809 3810 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev) 3811 { 3812 struct bonding *bond = netdev_priv(bond_dev); 3813 struct iphdr *iph = ip_hdr(skb); 3814 struct slave *slave; 3815 u32 slave_id; 3816 3817 /* Start with the curr_active_slave that joined the bond as the 3818 * default for sending IGMP traffic. For failover purposes one 3819 * needs to maintain some consistency for the interface that will 3820 * send the join/membership reports. The curr_active_slave found 3821 * will send all of this type of traffic. 3822 */ 3823 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) { 3824 slave = rcu_dereference(bond->curr_active_slave); 3825 if (slave) 3826 bond_dev_queue_xmit(bond, skb, slave->dev); 3827 else 3828 bond_xmit_slave_id(bond, skb, 0); 3829 } else { 3830 int slave_cnt = READ_ONCE(bond->slave_cnt); 3831 3832 if (likely(slave_cnt)) { 3833 slave_id = bond_rr_gen_slave_id(bond); 3834 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt); 3835 } else { 3836 bond_tx_drop(bond_dev, skb); 3837 } 3838 } 3839 3840 return NETDEV_TX_OK; 3841 } 3842 3843 /* In active-backup mode, we know that bond->curr_active_slave is always valid if 3844 * the bond has a usable interface. 3845 */ 3846 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev) 3847 { 3848 struct bonding *bond = netdev_priv(bond_dev); 3849 struct slave *slave; 3850 3851 slave = rcu_dereference(bond->curr_active_slave); 3852 if (slave) 3853 bond_dev_queue_xmit(bond, skb, slave->dev); 3854 else 3855 bond_tx_drop(bond_dev, skb); 3856 3857 return NETDEV_TX_OK; 3858 } 3859 3860 /* Use this to update slave_array when (a) it's not appropriate to update 3861 * slave_array right away (note that update_slave_array() may sleep) 3862 * and / or (b) RTNL is not held. 3863 */ 3864 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay) 3865 { 3866 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay); 3867 } 3868 3869 /* Slave array work handler. Holds only RTNL */ 3870 static void bond_slave_arr_handler(struct work_struct *work) 3871 { 3872 struct bonding *bond = container_of(work, struct bonding, 3873 slave_arr_work.work); 3874 int ret; 3875 3876 if (!rtnl_trylock()) 3877 goto err; 3878 3879 ret = bond_update_slave_arr(bond, NULL); 3880 rtnl_unlock(); 3881 if (ret) { 3882 pr_warn_ratelimited("Failed to update slave array from WT\n"); 3883 goto err; 3884 } 3885 return; 3886 3887 err: 3888 bond_slave_arr_work_rearm(bond, 1); 3889 } 3890 3891 /* Build the usable slaves array in control path for modes that use xmit-hash 3892 * to determine the slave interface - 3893 * (a) BOND_MODE_8023AD 3894 * (b) BOND_MODE_XOR 3895 * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0 3896 * 3897 * The caller is expected to hold RTNL only and NO other lock! 3898 */ 3899 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave) 3900 { 3901 struct slave *slave; 3902 struct list_head *iter; 3903 struct bond_up_slave *new_arr, *old_arr; 3904 int agg_id = 0; 3905 int ret = 0; 3906 3907 #ifdef CONFIG_LOCKDEP 3908 WARN_ON(lockdep_is_held(&bond->mode_lock)); 3909 #endif 3910 3911 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]), 3912 GFP_KERNEL); 3913 if (!new_arr) { 3914 ret = -ENOMEM; 3915 pr_err("Failed to build slave-array.\n"); 3916 goto out; 3917 } 3918 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3919 struct ad_info ad_info; 3920 3921 if (bond_3ad_get_active_agg_info(bond, &ad_info)) { 3922 pr_debug("bond_3ad_get_active_agg_info failed\n"); 3923 kfree_rcu(new_arr, rcu); 3924 /* No active aggragator means it's not safe to use 3925 * the previous array. 3926 */ 3927 old_arr = rtnl_dereference(bond->slave_arr); 3928 if (old_arr) { 3929 RCU_INIT_POINTER(bond->slave_arr, NULL); 3930 kfree_rcu(old_arr, rcu); 3931 } 3932 goto out; 3933 } 3934 agg_id = ad_info.aggregator_id; 3935 } 3936 bond_for_each_slave(bond, slave, iter) { 3937 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3938 struct aggregator *agg; 3939 3940 agg = SLAVE_AD_INFO(slave)->port.aggregator; 3941 if (!agg || agg->aggregator_identifier != agg_id) 3942 continue; 3943 } 3944 if (!bond_slave_can_tx(slave)) 3945 continue; 3946 if (skipslave == slave) 3947 continue; 3948 new_arr->arr[new_arr->count++] = slave; 3949 } 3950 3951 old_arr = rtnl_dereference(bond->slave_arr); 3952 rcu_assign_pointer(bond->slave_arr, new_arr); 3953 if (old_arr) 3954 kfree_rcu(old_arr, rcu); 3955 out: 3956 if (ret != 0 && skipslave) { 3957 int idx; 3958 3959 /* Rare situation where caller has asked to skip a specific 3960 * slave but allocation failed (most likely!). BTW this is 3961 * only possible when the call is initiated from 3962 * __bond_release_one(). In this situation; overwrite the 3963 * skipslave entry in the array with the last entry from the 3964 * array to avoid a situation where the xmit path may choose 3965 * this to-be-skipped slave to send a packet out. 3966 */ 3967 old_arr = rtnl_dereference(bond->slave_arr); 3968 for (idx = 0; idx < old_arr->count; idx++) { 3969 if (skipslave == old_arr->arr[idx]) { 3970 old_arr->arr[idx] = 3971 old_arr->arr[old_arr->count-1]; 3972 old_arr->count--; 3973 break; 3974 } 3975 } 3976 } 3977 return ret; 3978 } 3979 3980 /* Use this Xmit function for 3AD as well as XOR modes. The current 3981 * usable slave array is formed in the control path. The xmit function 3982 * just calculates hash and sends the packet out. 3983 */ 3984 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev) 3985 { 3986 struct bonding *bond = netdev_priv(dev); 3987 struct slave *slave; 3988 struct bond_up_slave *slaves; 3989 unsigned int count; 3990 3991 slaves = rcu_dereference(bond->slave_arr); 3992 count = slaves ? READ_ONCE(slaves->count) : 0; 3993 if (likely(count)) { 3994 slave = slaves->arr[bond_xmit_hash(bond, skb) % count]; 3995 bond_dev_queue_xmit(bond, skb, slave->dev); 3996 } else { 3997 bond_tx_drop(dev, skb); 3998 } 3999 4000 return NETDEV_TX_OK; 4001 } 4002 4003 /* in broadcast mode, we send everything to all usable interfaces. */ 4004 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev) 4005 { 4006 struct bonding *bond = netdev_priv(bond_dev); 4007 struct slave *slave = NULL; 4008 struct list_head *iter; 4009 4010 bond_for_each_slave_rcu(bond, slave, iter) { 4011 if (bond_is_last_slave(bond, slave)) 4012 break; 4013 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 4014 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 4015 4016 if (!skb2) { 4017 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n", 4018 bond_dev->name, __func__); 4019 continue; 4020 } 4021 bond_dev_queue_xmit(bond, skb2, slave->dev); 4022 } 4023 } 4024 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) 4025 bond_dev_queue_xmit(bond, skb, slave->dev); 4026 else 4027 bond_tx_drop(bond_dev, skb); 4028 4029 return NETDEV_TX_OK; 4030 } 4031 4032 /*------------------------- Device initialization ---------------------------*/ 4033 4034 /* Lookup the slave that corresponds to a qid */ 4035 static inline int bond_slave_override(struct bonding *bond, 4036 struct sk_buff *skb) 4037 { 4038 struct slave *slave = NULL; 4039 struct list_head *iter; 4040 4041 if (!skb->queue_mapping) 4042 return 1; 4043 4044 /* Find out if any slaves have the same mapping as this skb. */ 4045 bond_for_each_slave_rcu(bond, slave, iter) { 4046 if (slave->queue_id == skb->queue_mapping) { 4047 if (bond_slave_is_up(slave) && 4048 slave->link == BOND_LINK_UP) { 4049 bond_dev_queue_xmit(bond, skb, slave->dev); 4050 return 0; 4051 } 4052 /* If the slave isn't UP, use default transmit policy. */ 4053 break; 4054 } 4055 } 4056 4057 return 1; 4058 } 4059 4060 4061 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb, 4062 void *accel_priv, select_queue_fallback_t fallback) 4063 { 4064 /* This helper function exists to help dev_pick_tx get the correct 4065 * destination queue. Using a helper function skips a call to 4066 * skb_tx_hash and will put the skbs in the queue we expect on their 4067 * way down to the bonding driver. 4068 */ 4069 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 4070 4071 /* Save the original txq to restore before passing to the driver */ 4072 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping; 4073 4074 if (unlikely(txq >= dev->real_num_tx_queues)) { 4075 do { 4076 txq -= dev->real_num_tx_queues; 4077 } while (txq >= dev->real_num_tx_queues); 4078 } 4079 return txq; 4080 } 4081 4082 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4083 { 4084 struct bonding *bond = netdev_priv(dev); 4085 4086 if (bond_should_override_tx_queue(bond) && 4087 !bond_slave_override(bond, skb)) 4088 return NETDEV_TX_OK; 4089 4090 switch (BOND_MODE(bond)) { 4091 case BOND_MODE_ROUNDROBIN: 4092 return bond_xmit_roundrobin(skb, dev); 4093 case BOND_MODE_ACTIVEBACKUP: 4094 return bond_xmit_activebackup(skb, dev); 4095 case BOND_MODE_8023AD: 4096 case BOND_MODE_XOR: 4097 return bond_3ad_xor_xmit(skb, dev); 4098 case BOND_MODE_BROADCAST: 4099 return bond_xmit_broadcast(skb, dev); 4100 case BOND_MODE_ALB: 4101 return bond_alb_xmit(skb, dev); 4102 case BOND_MODE_TLB: 4103 return bond_tlb_xmit(skb, dev); 4104 default: 4105 /* Should never happen, mode already checked */ 4106 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond)); 4107 WARN_ON_ONCE(1); 4108 bond_tx_drop(dev, skb); 4109 return NETDEV_TX_OK; 4110 } 4111 } 4112 4113 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4114 { 4115 struct bonding *bond = netdev_priv(dev); 4116 netdev_tx_t ret = NETDEV_TX_OK; 4117 4118 /* If we risk deadlock from transmitting this in the 4119 * netpoll path, tell netpoll to queue the frame for later tx 4120 */ 4121 if (unlikely(is_netpoll_tx_blocked(dev))) 4122 return NETDEV_TX_BUSY; 4123 4124 rcu_read_lock(); 4125 if (bond_has_slaves(bond)) 4126 ret = __bond_start_xmit(skb, dev); 4127 else 4128 bond_tx_drop(dev, skb); 4129 rcu_read_unlock(); 4130 4131 return ret; 4132 } 4133 4134 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev, 4135 struct ethtool_link_ksettings *cmd) 4136 { 4137 struct bonding *bond = netdev_priv(bond_dev); 4138 unsigned long speed = 0; 4139 struct list_head *iter; 4140 struct slave *slave; 4141 4142 cmd->base.duplex = DUPLEX_UNKNOWN; 4143 cmd->base.port = PORT_OTHER; 4144 4145 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we 4146 * do not need to check mode. Though link speed might not represent 4147 * the true receive or transmit bandwidth (not all modes are symmetric) 4148 * this is an accurate maximum. 4149 */ 4150 bond_for_each_slave(bond, slave, iter) { 4151 if (bond_slave_can_tx(slave)) { 4152 if (slave->speed != SPEED_UNKNOWN) 4153 speed += slave->speed; 4154 if (cmd->base.duplex == DUPLEX_UNKNOWN && 4155 slave->duplex != DUPLEX_UNKNOWN) 4156 cmd->base.duplex = slave->duplex; 4157 } 4158 } 4159 cmd->base.speed = speed ? : SPEED_UNKNOWN; 4160 4161 return 0; 4162 } 4163 4164 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 4165 struct ethtool_drvinfo *drvinfo) 4166 { 4167 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver)); 4168 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version)); 4169 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d", 4170 BOND_ABI_VERSION); 4171 } 4172 4173 static const struct ethtool_ops bond_ethtool_ops = { 4174 .get_drvinfo = bond_ethtool_get_drvinfo, 4175 .get_link = ethtool_op_get_link, 4176 .get_link_ksettings = bond_ethtool_get_link_ksettings, 4177 }; 4178 4179 static const struct net_device_ops bond_netdev_ops = { 4180 .ndo_init = bond_init, 4181 .ndo_uninit = bond_uninit, 4182 .ndo_open = bond_open, 4183 .ndo_stop = bond_close, 4184 .ndo_start_xmit = bond_start_xmit, 4185 .ndo_select_queue = bond_select_queue, 4186 .ndo_get_stats64 = bond_get_stats, 4187 .ndo_do_ioctl = bond_do_ioctl, 4188 .ndo_change_rx_flags = bond_change_rx_flags, 4189 .ndo_set_rx_mode = bond_set_rx_mode, 4190 .ndo_change_mtu = bond_change_mtu, 4191 .ndo_set_mac_address = bond_set_mac_address, 4192 .ndo_neigh_setup = bond_neigh_setup, 4193 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 4194 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 4195 #ifdef CONFIG_NET_POLL_CONTROLLER 4196 .ndo_netpoll_setup = bond_netpoll_setup, 4197 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 4198 .ndo_poll_controller = bond_poll_controller, 4199 #endif 4200 .ndo_add_slave = bond_enslave, 4201 .ndo_del_slave = bond_release, 4202 .ndo_fix_features = bond_fix_features, 4203 .ndo_features_check = passthru_features_check, 4204 }; 4205 4206 static const struct device_type bond_type = { 4207 .name = "bond", 4208 }; 4209 4210 static void bond_destructor(struct net_device *bond_dev) 4211 { 4212 struct bonding *bond = netdev_priv(bond_dev); 4213 if (bond->wq) 4214 destroy_workqueue(bond->wq); 4215 } 4216 4217 void bond_setup(struct net_device *bond_dev) 4218 { 4219 struct bonding *bond = netdev_priv(bond_dev); 4220 4221 spin_lock_init(&bond->mode_lock); 4222 spin_lock_init(&bond->stats_lock); 4223 bond->params = bonding_defaults; 4224 4225 /* Initialize pointers */ 4226 bond->dev = bond_dev; 4227 4228 /* Initialize the device entry points */ 4229 ether_setup(bond_dev); 4230 bond_dev->max_mtu = ETH_MAX_MTU; 4231 bond_dev->netdev_ops = &bond_netdev_ops; 4232 bond_dev->ethtool_ops = &bond_ethtool_ops; 4233 4234 bond_dev->needs_free_netdev = true; 4235 bond_dev->priv_destructor = bond_destructor; 4236 4237 SET_NETDEV_DEVTYPE(bond_dev, &bond_type); 4238 4239 /* Initialize the device options */ 4240 bond_dev->flags |= IFF_MASTER; 4241 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE; 4242 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 4243 4244 /* don't acquire bond device's netif_tx_lock when transmitting */ 4245 bond_dev->features |= NETIF_F_LLTX; 4246 4247 /* By default, we declare the bond to be fully 4248 * VLAN hardware accelerated capable. Special 4249 * care is taken in the various xmit functions 4250 * when there are slaves that are not hw accel 4251 * capable 4252 */ 4253 4254 /* Don't allow bond devices to change network namespaces. */ 4255 bond_dev->features |= NETIF_F_NETNS_LOCAL; 4256 4257 bond_dev->hw_features = BOND_VLAN_FEATURES | 4258 NETIF_F_HW_VLAN_CTAG_TX | 4259 NETIF_F_HW_VLAN_CTAG_RX | 4260 NETIF_F_HW_VLAN_CTAG_FILTER; 4261 4262 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL; 4263 bond_dev->features |= bond_dev->hw_features; 4264 } 4265 4266 /* Destroy a bonding device. 4267 * Must be under rtnl_lock when this function is called. 4268 */ 4269 static void bond_uninit(struct net_device *bond_dev) 4270 { 4271 struct bonding *bond = netdev_priv(bond_dev); 4272 struct list_head *iter; 4273 struct slave *slave; 4274 struct bond_up_slave *arr; 4275 4276 bond_netpoll_cleanup(bond_dev); 4277 4278 /* Release the bonded slaves */ 4279 bond_for_each_slave(bond, slave, iter) 4280 __bond_release_one(bond_dev, slave->dev, true, true); 4281 netdev_info(bond_dev, "Released all slaves\n"); 4282 4283 arr = rtnl_dereference(bond->slave_arr); 4284 if (arr) { 4285 RCU_INIT_POINTER(bond->slave_arr, NULL); 4286 kfree_rcu(arr, rcu); 4287 } 4288 4289 list_del(&bond->bond_list); 4290 4291 bond_debug_unregister(bond); 4292 } 4293 4294 /*------------------------- Module initialization ---------------------------*/ 4295 4296 static int bond_check_params(struct bond_params *params) 4297 { 4298 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i; 4299 struct bond_opt_value newval; 4300 const struct bond_opt_value *valptr; 4301 int arp_all_targets_value = 0; 4302 u16 ad_actor_sys_prio = 0; 4303 u16 ad_user_port_key = 0; 4304 __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 }; 4305 int arp_ip_count; 4306 int bond_mode = BOND_MODE_ROUNDROBIN; 4307 int xmit_hashtype = BOND_XMIT_POLICY_LAYER2; 4308 int lacp_fast = 0; 4309 int tlb_dynamic_lb; 4310 4311 /* Convert string parameters. */ 4312 if (mode) { 4313 bond_opt_initstr(&newval, mode); 4314 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval); 4315 if (!valptr) { 4316 pr_err("Error: Invalid bonding mode \"%s\"\n", mode); 4317 return -EINVAL; 4318 } 4319 bond_mode = valptr->value; 4320 } 4321 4322 if (xmit_hash_policy) { 4323 if ((bond_mode != BOND_MODE_XOR) && 4324 (bond_mode != BOND_MODE_8023AD) && 4325 (bond_mode != BOND_MODE_TLB)) { 4326 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 4327 bond_mode_name(bond_mode)); 4328 } else { 4329 bond_opt_initstr(&newval, xmit_hash_policy); 4330 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH), 4331 &newval); 4332 if (!valptr) { 4333 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 4334 xmit_hash_policy); 4335 return -EINVAL; 4336 } 4337 xmit_hashtype = valptr->value; 4338 } 4339 } 4340 4341 if (lacp_rate) { 4342 if (bond_mode != BOND_MODE_8023AD) { 4343 pr_info("lacp_rate param is irrelevant in mode %s\n", 4344 bond_mode_name(bond_mode)); 4345 } else { 4346 bond_opt_initstr(&newval, lacp_rate); 4347 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE), 4348 &newval); 4349 if (!valptr) { 4350 pr_err("Error: Invalid lacp rate \"%s\"\n", 4351 lacp_rate); 4352 return -EINVAL; 4353 } 4354 lacp_fast = valptr->value; 4355 } 4356 } 4357 4358 if (ad_select) { 4359 bond_opt_initstr(&newval, ad_select); 4360 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT), 4361 &newval); 4362 if (!valptr) { 4363 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select); 4364 return -EINVAL; 4365 } 4366 params->ad_select = valptr->value; 4367 if (bond_mode != BOND_MODE_8023AD) 4368 pr_warn("ad_select param only affects 802.3ad mode\n"); 4369 } else { 4370 params->ad_select = BOND_AD_STABLE; 4371 } 4372 4373 if (max_bonds < 0) { 4374 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 4375 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 4376 max_bonds = BOND_DEFAULT_MAX_BONDS; 4377 } 4378 4379 if (miimon < 0) { 4380 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4381 miimon, INT_MAX); 4382 miimon = 0; 4383 } 4384 4385 if (updelay < 0) { 4386 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4387 updelay, INT_MAX); 4388 updelay = 0; 4389 } 4390 4391 if (downdelay < 0) { 4392 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4393 downdelay, INT_MAX); 4394 downdelay = 0; 4395 } 4396 4397 if ((use_carrier != 0) && (use_carrier != 1)) { 4398 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 4399 use_carrier); 4400 use_carrier = 1; 4401 } 4402 4403 if (num_peer_notif < 0 || num_peer_notif > 255) { 4404 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 4405 num_peer_notif); 4406 num_peer_notif = 1; 4407 } 4408 4409 /* reset values for 802.3ad/TLB/ALB */ 4410 if (!bond_mode_uses_arp(bond_mode)) { 4411 if (!miimon) { 4412 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"); 4413 pr_warn("Forcing miimon to 100msec\n"); 4414 miimon = BOND_DEFAULT_MIIMON; 4415 } 4416 } 4417 4418 if (tx_queues < 1 || tx_queues > 255) { 4419 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n", 4420 tx_queues, BOND_DEFAULT_TX_QUEUES); 4421 tx_queues = BOND_DEFAULT_TX_QUEUES; 4422 } 4423 4424 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 4425 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n", 4426 all_slaves_active); 4427 all_slaves_active = 0; 4428 } 4429 4430 if (resend_igmp < 0 || resend_igmp > 255) { 4431 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n", 4432 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 4433 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 4434 } 4435 4436 bond_opt_initval(&newval, packets_per_slave); 4437 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) { 4438 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n", 4439 packets_per_slave, USHRT_MAX); 4440 packets_per_slave = 1; 4441 } 4442 4443 if (bond_mode == BOND_MODE_ALB) { 4444 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", 4445 updelay); 4446 } 4447 4448 if (!miimon) { 4449 if (updelay || downdelay) { 4450 /* just warn the user the up/down delay will have 4451 * no effect since miimon is zero... 4452 */ 4453 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", 4454 updelay, downdelay); 4455 } 4456 } else { 4457 /* don't allow arp monitoring */ 4458 if (arp_interval) { 4459 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 4460 miimon, arp_interval); 4461 arp_interval = 0; 4462 } 4463 4464 if ((updelay % miimon) != 0) { 4465 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 4466 updelay, miimon, (updelay / miimon) * miimon); 4467 } 4468 4469 updelay /= miimon; 4470 4471 if ((downdelay % miimon) != 0) { 4472 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 4473 downdelay, miimon, 4474 (downdelay / miimon) * miimon); 4475 } 4476 4477 downdelay /= miimon; 4478 } 4479 4480 if (arp_interval < 0) { 4481 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4482 arp_interval, INT_MAX); 4483 arp_interval = 0; 4484 } 4485 4486 for (arp_ip_count = 0, i = 0; 4487 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) { 4488 __be32 ip; 4489 4490 /* not a complete check, but good enough to catch mistakes */ 4491 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) || 4492 !bond_is_ip_target_ok(ip)) { 4493 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 4494 arp_ip_target[i]); 4495 arp_interval = 0; 4496 } else { 4497 if (bond_get_targets_ip(arp_target, ip) == -1) 4498 arp_target[arp_ip_count++] = ip; 4499 else 4500 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n", 4501 &ip); 4502 } 4503 } 4504 4505 if (arp_interval && !arp_ip_count) { 4506 /* don't allow arping if no arp_ip_target given... */ 4507 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 4508 arp_interval); 4509 arp_interval = 0; 4510 } 4511 4512 if (arp_validate) { 4513 if (!arp_interval) { 4514 pr_err("arp_validate requires arp_interval\n"); 4515 return -EINVAL; 4516 } 4517 4518 bond_opt_initstr(&newval, arp_validate); 4519 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE), 4520 &newval); 4521 if (!valptr) { 4522 pr_err("Error: invalid arp_validate \"%s\"\n", 4523 arp_validate); 4524 return -EINVAL; 4525 } 4526 arp_validate_value = valptr->value; 4527 } else { 4528 arp_validate_value = 0; 4529 } 4530 4531 if (arp_all_targets) { 4532 bond_opt_initstr(&newval, arp_all_targets); 4533 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS), 4534 &newval); 4535 if (!valptr) { 4536 pr_err("Error: invalid arp_all_targets_value \"%s\"\n", 4537 arp_all_targets); 4538 arp_all_targets_value = 0; 4539 } else { 4540 arp_all_targets_value = valptr->value; 4541 } 4542 } 4543 4544 if (miimon) { 4545 pr_info("MII link monitoring set to %d ms\n", miimon); 4546 } else if (arp_interval) { 4547 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE, 4548 arp_validate_value); 4549 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 4550 arp_interval, valptr->string, arp_ip_count); 4551 4552 for (i = 0; i < arp_ip_count; i++) 4553 pr_cont(" %s", arp_ip_target[i]); 4554 4555 pr_cont("\n"); 4556 4557 } else if (max_bonds) { 4558 /* miimon and arp_interval not set, we need one so things 4559 * work as expected, see bonding.txt for details 4560 */ 4561 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"); 4562 } 4563 4564 if (primary && !bond_mode_uses_primary(bond_mode)) { 4565 /* currently, using a primary only makes sense 4566 * in active backup, TLB or ALB modes 4567 */ 4568 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n", 4569 primary, bond_mode_name(bond_mode)); 4570 primary = NULL; 4571 } 4572 4573 if (primary && primary_reselect) { 4574 bond_opt_initstr(&newval, primary_reselect); 4575 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT), 4576 &newval); 4577 if (!valptr) { 4578 pr_err("Error: Invalid primary_reselect \"%s\"\n", 4579 primary_reselect); 4580 return -EINVAL; 4581 } 4582 primary_reselect_value = valptr->value; 4583 } else { 4584 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 4585 } 4586 4587 if (fail_over_mac) { 4588 bond_opt_initstr(&newval, fail_over_mac); 4589 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC), 4590 &newval); 4591 if (!valptr) { 4592 pr_err("Error: invalid fail_over_mac \"%s\"\n", 4593 fail_over_mac); 4594 return -EINVAL; 4595 } 4596 fail_over_mac_value = valptr->value; 4597 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 4598 pr_warn("Warning: fail_over_mac only affects active-backup mode\n"); 4599 } else { 4600 fail_over_mac_value = BOND_FOM_NONE; 4601 } 4602 4603 bond_opt_initstr(&newval, "default"); 4604 valptr = bond_opt_parse( 4605 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO), 4606 &newval); 4607 if (!valptr) { 4608 pr_err("Error: No ad_actor_sys_prio default value"); 4609 return -EINVAL; 4610 } 4611 ad_actor_sys_prio = valptr->value; 4612 4613 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY), 4614 &newval); 4615 if (!valptr) { 4616 pr_err("Error: No ad_user_port_key default value"); 4617 return -EINVAL; 4618 } 4619 ad_user_port_key = valptr->value; 4620 4621 bond_opt_initstr(&newval, "default"); 4622 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval); 4623 if (!valptr) { 4624 pr_err("Error: No tlb_dynamic_lb default value"); 4625 return -EINVAL; 4626 } 4627 tlb_dynamic_lb = valptr->value; 4628 4629 if (lp_interval == 0) { 4630 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n", 4631 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL); 4632 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 4633 } 4634 4635 /* fill params struct with the proper values */ 4636 params->mode = bond_mode; 4637 params->xmit_policy = xmit_hashtype; 4638 params->miimon = miimon; 4639 params->num_peer_notif = num_peer_notif; 4640 params->arp_interval = arp_interval; 4641 params->arp_validate = arp_validate_value; 4642 params->arp_all_targets = arp_all_targets_value; 4643 params->updelay = updelay; 4644 params->downdelay = downdelay; 4645 params->use_carrier = use_carrier; 4646 params->lacp_fast = lacp_fast; 4647 params->primary[0] = 0; 4648 params->primary_reselect = primary_reselect_value; 4649 params->fail_over_mac = fail_over_mac_value; 4650 params->tx_queues = tx_queues; 4651 params->all_slaves_active = all_slaves_active; 4652 params->resend_igmp = resend_igmp; 4653 params->min_links = min_links; 4654 params->lp_interval = lp_interval; 4655 params->packets_per_slave = packets_per_slave; 4656 params->tlb_dynamic_lb = tlb_dynamic_lb; 4657 params->ad_actor_sys_prio = ad_actor_sys_prio; 4658 eth_zero_addr(params->ad_actor_system); 4659 params->ad_user_port_key = ad_user_port_key; 4660 if (packets_per_slave > 0) { 4661 params->reciprocal_packets_per_slave = 4662 reciprocal_value(packets_per_slave); 4663 } else { 4664 /* reciprocal_packets_per_slave is unused if 4665 * packets_per_slave is 0 or 1, just initialize it 4666 */ 4667 params->reciprocal_packets_per_slave = 4668 (struct reciprocal_value) { 0 }; 4669 } 4670 4671 if (primary) { 4672 strncpy(params->primary, primary, IFNAMSIZ); 4673 params->primary[IFNAMSIZ - 1] = 0; 4674 } 4675 4676 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 4677 4678 return 0; 4679 } 4680 4681 /* Called from registration process */ 4682 static int bond_init(struct net_device *bond_dev) 4683 { 4684 struct bonding *bond = netdev_priv(bond_dev); 4685 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 4686 4687 netdev_dbg(bond_dev, "Begin bond_init\n"); 4688 4689 bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM); 4690 if (!bond->wq) 4691 return -ENOMEM; 4692 4693 netdev_lockdep_set_classes(bond_dev); 4694 4695 list_add_tail(&bond->bond_list, &bn->dev_list); 4696 4697 bond_prepare_sysfs_group(bond); 4698 4699 bond_debug_register(bond); 4700 4701 /* Ensure valid dev_addr */ 4702 if (is_zero_ether_addr(bond_dev->dev_addr) && 4703 bond_dev->addr_assign_type == NET_ADDR_PERM) 4704 eth_hw_addr_random(bond_dev); 4705 4706 return 0; 4707 } 4708 4709 unsigned int bond_get_num_tx_queues(void) 4710 { 4711 return tx_queues; 4712 } 4713 4714 /* Create a new bond based on the specified name and bonding parameters. 4715 * If name is NULL, obtain a suitable "bond%d" name for us. 4716 * Caller must NOT hold rtnl_lock; we need to release it here before we 4717 * set up our sysfs entries. 4718 */ 4719 int bond_create(struct net *net, const char *name) 4720 { 4721 struct net_device *bond_dev; 4722 struct bonding *bond; 4723 struct alb_bond_info *bond_info; 4724 int res; 4725 4726 rtnl_lock(); 4727 4728 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 4729 name ? name : "bond%d", NET_NAME_UNKNOWN, 4730 bond_setup, tx_queues); 4731 if (!bond_dev) { 4732 pr_err("%s: eek! can't alloc netdev!\n", name); 4733 rtnl_unlock(); 4734 return -ENOMEM; 4735 } 4736 4737 /* 4738 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX. 4739 * It is set to 0 by default which is wrong. 4740 */ 4741 bond = netdev_priv(bond_dev); 4742 bond_info = &(BOND_ALB_INFO(bond)); 4743 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; 4744 4745 dev_net_set(bond_dev, net); 4746 bond_dev->rtnl_link_ops = &bond_link_ops; 4747 4748 res = register_netdevice(bond_dev); 4749 4750 netif_carrier_off(bond_dev); 4751 4752 bond_work_init_all(bond); 4753 4754 rtnl_unlock(); 4755 if (res < 0) 4756 free_netdev(bond_dev); 4757 return res; 4758 } 4759 4760 static int __net_init bond_net_init(struct net *net) 4761 { 4762 struct bond_net *bn = net_generic(net, bond_net_id); 4763 4764 bn->net = net; 4765 INIT_LIST_HEAD(&bn->dev_list); 4766 4767 bond_create_proc_dir(bn); 4768 bond_create_sysfs(bn); 4769 4770 return 0; 4771 } 4772 4773 static void __net_exit bond_net_exit(struct net *net) 4774 { 4775 struct bond_net *bn = net_generic(net, bond_net_id); 4776 struct bonding *bond, *tmp_bond; 4777 LIST_HEAD(list); 4778 4779 bond_destroy_sysfs(bn); 4780 4781 /* Kill off any bonds created after unregistering bond rtnl ops */ 4782 rtnl_lock(); 4783 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list) 4784 unregister_netdevice_queue(bond->dev, &list); 4785 unregister_netdevice_many(&list); 4786 rtnl_unlock(); 4787 4788 bond_destroy_proc_dir(bn); 4789 } 4790 4791 static struct pernet_operations bond_net_ops = { 4792 .init = bond_net_init, 4793 .exit = bond_net_exit, 4794 .id = &bond_net_id, 4795 .size = sizeof(struct bond_net), 4796 }; 4797 4798 static int __init bonding_init(void) 4799 { 4800 int i; 4801 int res; 4802 4803 pr_info("%s", bond_version); 4804 4805 res = bond_check_params(&bonding_defaults); 4806 if (res) 4807 goto out; 4808 4809 res = register_pernet_subsys(&bond_net_ops); 4810 if (res) 4811 goto out; 4812 4813 res = bond_netlink_init(); 4814 if (res) 4815 goto err_link; 4816 4817 bond_create_debugfs(); 4818 4819 for (i = 0; i < max_bonds; i++) { 4820 res = bond_create(&init_net, NULL); 4821 if (res) 4822 goto err; 4823 } 4824 4825 register_netdevice_notifier(&bond_netdev_notifier); 4826 out: 4827 return res; 4828 err: 4829 bond_destroy_debugfs(); 4830 bond_netlink_fini(); 4831 err_link: 4832 unregister_pernet_subsys(&bond_net_ops); 4833 goto out; 4834 4835 } 4836 4837 static void __exit bonding_exit(void) 4838 { 4839 unregister_netdevice_notifier(&bond_netdev_notifier); 4840 4841 bond_destroy_debugfs(); 4842 4843 bond_netlink_fini(); 4844 unregister_pernet_subsys(&bond_net_ops); 4845 4846 #ifdef CONFIG_NET_POLL_CONTROLLER 4847 /* Make sure we don't have an imbalance on our netpoll blocking */ 4848 WARN_ON(atomic_read(&netpoll_block_tx)); 4849 #endif 4850 } 4851 4852 module_init(bonding_init); 4853 module_exit(bonding_exit); 4854 MODULE_LICENSE("GPL"); 4855 MODULE_VERSION(DRV_VERSION); 4856 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION); 4857 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 4858