1 /* 2 * originally based on the dummy device. 3 * 4 * Copyright 1999, Thomas Davis, tadavis@lbl.gov. 5 * Licensed under the GPL. Based on dummy.c, and eql.c devices. 6 * 7 * bonding.c: an Ethernet Bonding driver 8 * 9 * This is useful to talk to a Cisco EtherChannel compatible equipment: 10 * Cisco 5500 11 * Sun Trunking (Solaris) 12 * Alteon AceDirector Trunks 13 * Linux Bonding 14 * and probably many L2 switches ... 15 * 16 * How it works: 17 * ifconfig bond0 ipaddress netmask up 18 * will setup a network device, with an ip address. No mac address 19 * will be assigned at this time. The hw mac address will come from 20 * the first slave bonded to the channel. All slaves will then use 21 * this hw mac address. 22 * 23 * ifconfig bond0 down 24 * will release all slaves, marking them as down. 25 * 26 * ifenslave bond0 eth0 27 * will attach eth0 to bond0 as a slave. eth0 hw mac address will either 28 * a: be used as initial mac address 29 * b: if a hw mac address already is there, eth0's hw mac address 30 * will then be set from bond0. 31 * 32 */ 33 34 #include <linux/kernel.h> 35 #include <linux/module.h> 36 #include <linux/types.h> 37 #include <linux/fcntl.h> 38 #include <linux/interrupt.h> 39 #include <linux/ptrace.h> 40 #include <linux/ioport.h> 41 #include <linux/in.h> 42 #include <net/ip.h> 43 #include <linux/ip.h> 44 #include <linux/tcp.h> 45 #include <linux/udp.h> 46 #include <linux/slab.h> 47 #include <linux/string.h> 48 #include <linux/init.h> 49 #include <linux/timer.h> 50 #include <linux/socket.h> 51 #include <linux/ctype.h> 52 #include <linux/inet.h> 53 #include <linux/bitops.h> 54 #include <linux/io.h> 55 #include <asm/dma.h> 56 #include <linux/uaccess.h> 57 #include <linux/errno.h> 58 #include <linux/netdevice.h> 59 #include <linux/inetdevice.h> 60 #include <linux/igmp.h> 61 #include <linux/etherdevice.h> 62 #include <linux/skbuff.h> 63 #include <net/sock.h> 64 #include <linux/rtnetlink.h> 65 #include <linux/smp.h> 66 #include <linux/if_ether.h> 67 #include <net/arp.h> 68 #include <linux/mii.h> 69 #include <linux/ethtool.h> 70 #include <linux/if_vlan.h> 71 #include <linux/if_bonding.h> 72 #include <linux/jiffies.h> 73 #include <linux/preempt.h> 74 #include <net/route.h> 75 #include <net/net_namespace.h> 76 #include <net/netns/generic.h> 77 #include <net/pkt_sched.h> 78 #include <linux/rculist.h> 79 #include <net/flow_dissector.h> 80 #include <net/switchdev.h> 81 #include <net/bonding.h> 82 #include <net/bond_3ad.h> 83 #include <net/bond_alb.h> 84 85 #include "bonding_priv.h" 86 87 /*---------------------------- Module parameters ----------------------------*/ 88 89 /* monitor all links that often (in milliseconds). <=0 disables monitoring */ 90 91 static int max_bonds = BOND_DEFAULT_MAX_BONDS; 92 static int tx_queues = BOND_DEFAULT_TX_QUEUES; 93 static int num_peer_notif = 1; 94 static int miimon; 95 static int updelay; 96 static int downdelay; 97 static int use_carrier = 1; 98 static char *mode; 99 static char *primary; 100 static char *primary_reselect; 101 static char *lacp_rate; 102 static int min_links; 103 static char *ad_select; 104 static char *xmit_hash_policy; 105 static int arp_interval; 106 static char *arp_ip_target[BOND_MAX_ARP_TARGETS]; 107 static char *arp_validate; 108 static char *arp_all_targets; 109 static char *fail_over_mac; 110 static int all_slaves_active; 111 static struct bond_params bonding_defaults; 112 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP; 113 static int packets_per_slave = 1; 114 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 115 116 module_param(max_bonds, int, 0); 117 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices"); 118 module_param(tx_queues, int, 0); 119 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)"); 120 module_param_named(num_grat_arp, num_peer_notif, int, 0644); 121 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on " 122 "failover event (alias of num_unsol_na)"); 123 module_param_named(num_unsol_na, num_peer_notif, int, 0644); 124 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on " 125 "failover event (alias of num_grat_arp)"); 126 module_param(miimon, int, 0); 127 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds"); 128 module_param(updelay, int, 0); 129 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds"); 130 module_param(downdelay, int, 0); 131 MODULE_PARM_DESC(downdelay, "Delay before considering link down, " 132 "in milliseconds"); 133 module_param(use_carrier, int, 0); 134 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; " 135 "0 for off, 1 for on (default)"); 136 module_param(mode, charp, 0); 137 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, " 138 "1 for active-backup, 2 for balance-xor, " 139 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, " 140 "6 for balance-alb"); 141 module_param(primary, charp, 0); 142 MODULE_PARM_DESC(primary, "Primary network device to use"); 143 module_param(primary_reselect, charp, 0); 144 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave " 145 "once it comes up; " 146 "0 for always (default), " 147 "1 for only if speed of primary is " 148 "better, " 149 "2 for only on active slave " 150 "failure"); 151 module_param(lacp_rate, charp, 0); 152 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; " 153 "0 for slow, 1 for fast"); 154 module_param(ad_select, charp, 0); 155 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; " 156 "0 for stable (default), 1 for bandwidth, " 157 "2 for count"); 158 module_param(min_links, int, 0); 159 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier"); 160 161 module_param(xmit_hash_policy, charp, 0); 162 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; " 163 "0 for layer 2 (default), 1 for layer 3+4, " 164 "2 for layer 2+3, 3 for encap layer 2+3, " 165 "4 for encap layer 3+4"); 166 module_param(arp_interval, int, 0); 167 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds"); 168 module_param_array(arp_ip_target, charp, NULL, 0); 169 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form"); 170 module_param(arp_validate, charp, 0); 171 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; " 172 "0 for none (default), 1 for active, " 173 "2 for backup, 3 for all"); 174 module_param(arp_all_targets, charp, 0); 175 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all"); 176 module_param(fail_over_mac, charp, 0); 177 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to " 178 "the same MAC; 0 for none (default), " 179 "1 for active, 2 for follow"); 180 module_param(all_slaves_active, int, 0); 181 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface " 182 "by setting active flag for all slaves; " 183 "0 for never (default), 1 for always."); 184 module_param(resend_igmp, int, 0); 185 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on " 186 "link failure"); 187 module_param(packets_per_slave, int, 0); 188 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr " 189 "mode; 0 for a random slave, 1 packet per " 190 "slave (default), >1 packets per slave."); 191 module_param(lp_interval, uint, 0); 192 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where " 193 "the bonding driver sends learning packets to " 194 "each slaves peer switch. The default is 1."); 195 196 /*----------------------------- Global variables ----------------------------*/ 197 198 #ifdef CONFIG_NET_POLL_CONTROLLER 199 atomic_t netpoll_block_tx = ATOMIC_INIT(0); 200 #endif 201 202 int bond_net_id __read_mostly; 203 204 static __be32 arp_target[BOND_MAX_ARP_TARGETS]; 205 static int arp_ip_count; 206 static int bond_mode = BOND_MODE_ROUNDROBIN; 207 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2; 208 static int lacp_fast; 209 210 /*-------------------------- Forward declarations ---------------------------*/ 211 212 static int bond_init(struct net_device *bond_dev); 213 static void bond_uninit(struct net_device *bond_dev); 214 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev, 215 struct rtnl_link_stats64 *stats); 216 static void bond_slave_arr_handler(struct work_struct *work); 217 218 /*---------------------------- General routines -----------------------------*/ 219 220 const char *bond_mode_name(int mode) 221 { 222 static const char *names[] = { 223 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)", 224 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)", 225 [BOND_MODE_XOR] = "load balancing (xor)", 226 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)", 227 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation", 228 [BOND_MODE_TLB] = "transmit load balancing", 229 [BOND_MODE_ALB] = "adaptive load balancing", 230 }; 231 232 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB) 233 return "unknown"; 234 235 return names[mode]; 236 } 237 238 /*---------------------------------- VLAN -----------------------------------*/ 239 240 /** 241 * bond_dev_queue_xmit - Prepare skb for xmit. 242 * 243 * @bond: bond device that got this skb for tx. 244 * @skb: hw accel VLAN tagged skb to transmit 245 * @slave_dev: slave that is supposed to xmit this skbuff 246 */ 247 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, 248 struct net_device *slave_dev) 249 { 250 skb->dev = slave_dev; 251 252 BUILD_BUG_ON(sizeof(skb->queue_mapping) != 253 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping)); 254 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping; 255 256 if (unlikely(netpoll_tx_running(bond->dev))) 257 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb); 258 else 259 dev_queue_xmit(skb); 260 } 261 262 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid, 263 * We don't protect the slave list iteration with a lock because: 264 * a. This operation is performed in IOCTL context, 265 * b. The operation is protected by the RTNL semaphore in the 8021q code, 266 * c. Holding a lock with BH disabled while directly calling a base driver 267 * entry point is generally a BAD idea. 268 * 269 * The design of synchronization/protection for this operation in the 8021q 270 * module is good for one or more VLAN devices over a single physical device 271 * and cannot be extended for a teaming solution like bonding, so there is a 272 * potential race condition here where a net device from the vlan group might 273 * be referenced (either by a base driver or the 8021q code) while it is being 274 * removed from the system. However, it turns out we're not making matters 275 * worse, and if it works for regular VLAN usage it will work here too. 276 */ 277 278 /** 279 * bond_vlan_rx_add_vid - Propagates adding an id to slaves 280 * @bond_dev: bonding net device that got called 281 * @vid: vlan id being added 282 */ 283 static int bond_vlan_rx_add_vid(struct net_device *bond_dev, 284 __be16 proto, u16 vid) 285 { 286 struct bonding *bond = netdev_priv(bond_dev); 287 struct slave *slave, *rollback_slave; 288 struct list_head *iter; 289 int res; 290 291 bond_for_each_slave(bond, slave, iter) { 292 res = vlan_vid_add(slave->dev, proto, vid); 293 if (res) 294 goto unwind; 295 } 296 297 return 0; 298 299 unwind: 300 /* unwind to the slave that failed */ 301 bond_for_each_slave(bond, rollback_slave, iter) { 302 if (rollback_slave == slave) 303 break; 304 305 vlan_vid_del(rollback_slave->dev, proto, vid); 306 } 307 308 return res; 309 } 310 311 /** 312 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves 313 * @bond_dev: bonding net device that got called 314 * @vid: vlan id being removed 315 */ 316 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, 317 __be16 proto, u16 vid) 318 { 319 struct bonding *bond = netdev_priv(bond_dev); 320 struct list_head *iter; 321 struct slave *slave; 322 323 bond_for_each_slave(bond, slave, iter) 324 vlan_vid_del(slave->dev, proto, vid); 325 326 if (bond_is_lb(bond)) 327 bond_alb_clear_vlan(bond, vid); 328 329 return 0; 330 } 331 332 /*------------------------------- Link status -------------------------------*/ 333 334 /* Set the carrier state for the master according to the state of its 335 * slaves. If any slaves are up, the master is up. In 802.3ad mode, 336 * do special 802.3ad magic. 337 * 338 * Returns zero if carrier state does not change, nonzero if it does. 339 */ 340 int bond_set_carrier(struct bonding *bond) 341 { 342 struct list_head *iter; 343 struct slave *slave; 344 345 if (!bond_has_slaves(bond)) 346 goto down; 347 348 if (BOND_MODE(bond) == BOND_MODE_8023AD) 349 return bond_3ad_set_carrier(bond); 350 351 bond_for_each_slave(bond, slave, iter) { 352 if (slave->link == BOND_LINK_UP) { 353 if (!netif_carrier_ok(bond->dev)) { 354 netif_carrier_on(bond->dev); 355 return 1; 356 } 357 return 0; 358 } 359 } 360 361 down: 362 if (netif_carrier_ok(bond->dev)) { 363 netif_carrier_off(bond->dev); 364 return 1; 365 } 366 return 0; 367 } 368 369 /* Get link speed and duplex from the slave's base driver 370 * using ethtool. If for some reason the call fails or the 371 * values are invalid, set speed and duplex to -1, 372 * and return. 373 */ 374 static void bond_update_speed_duplex(struct slave *slave) 375 { 376 struct net_device *slave_dev = slave->dev; 377 struct ethtool_cmd ecmd; 378 u32 slave_speed; 379 int res; 380 381 slave->speed = SPEED_UNKNOWN; 382 slave->duplex = DUPLEX_UNKNOWN; 383 384 res = __ethtool_get_settings(slave_dev, &ecmd); 385 if (res < 0) 386 return; 387 388 slave_speed = ethtool_cmd_speed(&ecmd); 389 if (slave_speed == 0 || slave_speed == ((__u32) -1)) 390 return; 391 392 switch (ecmd.duplex) { 393 case DUPLEX_FULL: 394 case DUPLEX_HALF: 395 break; 396 default: 397 return; 398 } 399 400 slave->speed = slave_speed; 401 slave->duplex = ecmd.duplex; 402 403 return; 404 } 405 406 const char *bond_slave_link_status(s8 link) 407 { 408 switch (link) { 409 case BOND_LINK_UP: 410 return "up"; 411 case BOND_LINK_FAIL: 412 return "going down"; 413 case BOND_LINK_DOWN: 414 return "down"; 415 case BOND_LINK_BACK: 416 return "going back"; 417 default: 418 return "unknown"; 419 } 420 } 421 422 /* if <dev> supports MII link status reporting, check its link status. 423 * 424 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), 425 * depending upon the setting of the use_carrier parameter. 426 * 427 * Return either BMSR_LSTATUS, meaning that the link is up (or we 428 * can't tell and just pretend it is), or 0, meaning that the link is 429 * down. 430 * 431 * If reporting is non-zero, instead of faking link up, return -1 if 432 * both ETHTOOL and MII ioctls fail (meaning the device does not 433 * support them). If use_carrier is set, return whatever it says. 434 * It'd be nice if there was a good way to tell if a driver supports 435 * netif_carrier, but there really isn't. 436 */ 437 static int bond_check_dev_link(struct bonding *bond, 438 struct net_device *slave_dev, int reporting) 439 { 440 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 441 int (*ioctl)(struct net_device *, struct ifreq *, int); 442 struct ifreq ifr; 443 struct mii_ioctl_data *mii; 444 445 if (!reporting && !netif_running(slave_dev)) 446 return 0; 447 448 if (bond->params.use_carrier) 449 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; 450 451 /* Try to get link status using Ethtool first. */ 452 if (slave_dev->ethtool_ops->get_link) 453 return slave_dev->ethtool_ops->get_link(slave_dev) ? 454 BMSR_LSTATUS : 0; 455 456 /* Ethtool can't be used, fallback to MII ioctls. */ 457 ioctl = slave_ops->ndo_do_ioctl; 458 if (ioctl) { 459 /* TODO: set pointer to correct ioctl on a per team member 460 * bases to make this more efficient. that is, once 461 * we determine the correct ioctl, we will always 462 * call it and not the others for that team 463 * member. 464 */ 465 466 /* We cannot assume that SIOCGMIIPHY will also read a 467 * register; not all network drivers (e.g., e100) 468 * support that. 469 */ 470 471 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ 472 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ); 473 mii = if_mii(&ifr); 474 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) { 475 mii->reg_num = MII_BMSR; 476 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) 477 return mii->val_out & BMSR_LSTATUS; 478 } 479 } 480 481 /* If reporting, report that either there's no dev->do_ioctl, 482 * or both SIOCGMIIREG and get_link failed (meaning that we 483 * cannot report link status). If not reporting, pretend 484 * we're ok. 485 */ 486 return reporting ? -1 : BMSR_LSTATUS; 487 } 488 489 /*----------------------------- Multicast list ------------------------------*/ 490 491 /* Push the promiscuity flag down to appropriate slaves */ 492 static int bond_set_promiscuity(struct bonding *bond, int inc) 493 { 494 struct list_head *iter; 495 int err = 0; 496 497 if (bond_uses_primary(bond)) { 498 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 499 500 if (curr_active) 501 err = dev_set_promiscuity(curr_active->dev, inc); 502 } else { 503 struct slave *slave; 504 505 bond_for_each_slave(bond, slave, iter) { 506 err = dev_set_promiscuity(slave->dev, inc); 507 if (err) 508 return err; 509 } 510 } 511 return err; 512 } 513 514 /* Push the allmulti flag down to all slaves */ 515 static int bond_set_allmulti(struct bonding *bond, int inc) 516 { 517 struct list_head *iter; 518 int err = 0; 519 520 if (bond_uses_primary(bond)) { 521 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 522 523 if (curr_active) 524 err = dev_set_allmulti(curr_active->dev, inc); 525 } else { 526 struct slave *slave; 527 528 bond_for_each_slave(bond, slave, iter) { 529 err = dev_set_allmulti(slave->dev, inc); 530 if (err) 531 return err; 532 } 533 } 534 return err; 535 } 536 537 /* Retrieve the list of registered multicast addresses for the bonding 538 * device and retransmit an IGMP JOIN request to the current active 539 * slave. 540 */ 541 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work) 542 { 543 struct bonding *bond = container_of(work, struct bonding, 544 mcast_work.work); 545 546 if (!rtnl_trylock()) { 547 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 548 return; 549 } 550 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev); 551 552 if (bond->igmp_retrans > 1) { 553 bond->igmp_retrans--; 554 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); 555 } 556 rtnl_unlock(); 557 } 558 559 /* Flush bond's hardware addresses from slave */ 560 static void bond_hw_addr_flush(struct net_device *bond_dev, 561 struct net_device *slave_dev) 562 { 563 struct bonding *bond = netdev_priv(bond_dev); 564 565 dev_uc_unsync(slave_dev, bond_dev); 566 dev_mc_unsync(slave_dev, bond_dev); 567 568 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 569 /* del lacpdu mc addr from mc list */ 570 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 571 572 dev_mc_del(slave_dev, lacpdu_multicast); 573 } 574 } 575 576 /*--------------------------- Active slave change ---------------------------*/ 577 578 /* Update the hardware address list and promisc/allmulti for the new and 579 * old active slaves (if any). Modes that are not using primary keep all 580 * slaves up date at all times; only the modes that use primary need to call 581 * this function to swap these settings during a failover. 582 */ 583 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active, 584 struct slave *old_active) 585 { 586 if (old_active) { 587 if (bond->dev->flags & IFF_PROMISC) 588 dev_set_promiscuity(old_active->dev, -1); 589 590 if (bond->dev->flags & IFF_ALLMULTI) 591 dev_set_allmulti(old_active->dev, -1); 592 593 bond_hw_addr_flush(bond->dev, old_active->dev); 594 } 595 596 if (new_active) { 597 /* FIXME: Signal errors upstream. */ 598 if (bond->dev->flags & IFF_PROMISC) 599 dev_set_promiscuity(new_active->dev, 1); 600 601 if (bond->dev->flags & IFF_ALLMULTI) 602 dev_set_allmulti(new_active->dev, 1); 603 604 netif_addr_lock_bh(bond->dev); 605 dev_uc_sync(new_active->dev, bond->dev); 606 dev_mc_sync(new_active->dev, bond->dev); 607 netif_addr_unlock_bh(bond->dev); 608 } 609 } 610 611 /** 612 * bond_set_dev_addr - clone slave's address to bond 613 * @bond_dev: bond net device 614 * @slave_dev: slave net device 615 * 616 * Should be called with RTNL held. 617 */ 618 static void bond_set_dev_addr(struct net_device *bond_dev, 619 struct net_device *slave_dev) 620 { 621 netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n", 622 bond_dev, slave_dev, slave_dev->addr_len); 623 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len); 624 bond_dev->addr_assign_type = NET_ADDR_STOLEN; 625 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev); 626 } 627 628 static struct slave *bond_get_old_active(struct bonding *bond, 629 struct slave *new_active) 630 { 631 struct slave *slave; 632 struct list_head *iter; 633 634 bond_for_each_slave(bond, slave, iter) { 635 if (slave == new_active) 636 continue; 637 638 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr)) 639 return slave; 640 } 641 642 return NULL; 643 } 644 645 /* bond_do_fail_over_mac 646 * 647 * Perform special MAC address swapping for fail_over_mac settings 648 * 649 * Called with RTNL 650 */ 651 static void bond_do_fail_over_mac(struct bonding *bond, 652 struct slave *new_active, 653 struct slave *old_active) 654 { 655 u8 tmp_mac[ETH_ALEN]; 656 struct sockaddr saddr; 657 int rv; 658 659 switch (bond->params.fail_over_mac) { 660 case BOND_FOM_ACTIVE: 661 if (new_active) 662 bond_set_dev_addr(bond->dev, new_active->dev); 663 break; 664 case BOND_FOM_FOLLOW: 665 /* if new_active && old_active, swap them 666 * if just old_active, do nothing (going to no active slave) 667 * if just new_active, set new_active to bond's MAC 668 */ 669 if (!new_active) 670 return; 671 672 if (!old_active) 673 old_active = bond_get_old_active(bond, new_active); 674 675 if (old_active) { 676 ether_addr_copy(tmp_mac, new_active->dev->dev_addr); 677 ether_addr_copy(saddr.sa_data, 678 old_active->dev->dev_addr); 679 saddr.sa_family = new_active->dev->type; 680 } else { 681 ether_addr_copy(saddr.sa_data, bond->dev->dev_addr); 682 saddr.sa_family = bond->dev->type; 683 } 684 685 rv = dev_set_mac_address(new_active->dev, &saddr); 686 if (rv) { 687 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n", 688 -rv, new_active->dev->name); 689 goto out; 690 } 691 692 if (!old_active) 693 goto out; 694 695 ether_addr_copy(saddr.sa_data, tmp_mac); 696 saddr.sa_family = old_active->dev->type; 697 698 rv = dev_set_mac_address(old_active->dev, &saddr); 699 if (rv) 700 netdev_err(bond->dev, "Error %d setting MAC of slave %s\n", 701 -rv, new_active->dev->name); 702 out: 703 break; 704 default: 705 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n", 706 bond->params.fail_over_mac); 707 break; 708 } 709 710 } 711 712 static struct slave *bond_choose_primary_or_current(struct bonding *bond) 713 { 714 struct slave *prim = rtnl_dereference(bond->primary_slave); 715 struct slave *curr = rtnl_dereference(bond->curr_active_slave); 716 717 if (!prim || prim->link != BOND_LINK_UP) { 718 if (!curr || curr->link != BOND_LINK_UP) 719 return NULL; 720 return curr; 721 } 722 723 if (bond->force_primary) { 724 bond->force_primary = false; 725 return prim; 726 } 727 728 if (!curr || curr->link != BOND_LINK_UP) 729 return prim; 730 731 /* At this point, prim and curr are both up */ 732 switch (bond->params.primary_reselect) { 733 case BOND_PRI_RESELECT_ALWAYS: 734 return prim; 735 case BOND_PRI_RESELECT_BETTER: 736 if (prim->speed < curr->speed) 737 return curr; 738 if (prim->speed == curr->speed && prim->duplex <= curr->duplex) 739 return curr; 740 return prim; 741 case BOND_PRI_RESELECT_FAILURE: 742 return curr; 743 default: 744 netdev_err(bond->dev, "impossible primary_reselect %d\n", 745 bond->params.primary_reselect); 746 return curr; 747 } 748 } 749 750 /** 751 * bond_find_best_slave - select the best available slave to be the active one 752 * @bond: our bonding struct 753 */ 754 static struct slave *bond_find_best_slave(struct bonding *bond) 755 { 756 struct slave *slave, *bestslave = NULL; 757 struct list_head *iter; 758 int mintime = bond->params.updelay; 759 760 slave = bond_choose_primary_or_current(bond); 761 if (slave) 762 return slave; 763 764 bond_for_each_slave(bond, slave, iter) { 765 if (slave->link == BOND_LINK_UP) 766 return slave; 767 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) && 768 slave->delay < mintime) { 769 mintime = slave->delay; 770 bestslave = slave; 771 } 772 } 773 774 return bestslave; 775 } 776 777 static bool bond_should_notify_peers(struct bonding *bond) 778 { 779 struct slave *slave; 780 781 rcu_read_lock(); 782 slave = rcu_dereference(bond->curr_active_slave); 783 rcu_read_unlock(); 784 785 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n", 786 slave ? slave->dev->name : "NULL"); 787 788 if (!slave || !bond->send_peer_notif || 789 !netif_carrier_ok(bond->dev) || 790 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) 791 return false; 792 793 return true; 794 } 795 796 /** 797 * change_active_interface - change the active slave into the specified one 798 * @bond: our bonding struct 799 * @new: the new slave to make the active one 800 * 801 * Set the new slave to the bond's settings and unset them on the old 802 * curr_active_slave. 803 * Setting include flags, mc-list, promiscuity, allmulti, etc. 804 * 805 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, 806 * because it is apparently the best available slave we have, even though its 807 * updelay hasn't timed out yet. 808 * 809 * Caller must hold RTNL. 810 */ 811 void bond_change_active_slave(struct bonding *bond, struct slave *new_active) 812 { 813 struct slave *old_active; 814 815 ASSERT_RTNL(); 816 817 old_active = rtnl_dereference(bond->curr_active_slave); 818 819 if (old_active == new_active) 820 return; 821 822 if (new_active) { 823 new_active->last_link_up = jiffies; 824 825 if (new_active->link == BOND_LINK_BACK) { 826 if (bond_uses_primary(bond)) { 827 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n", 828 new_active->dev->name, 829 (bond->params.updelay - new_active->delay) * bond->params.miimon); 830 } 831 832 new_active->delay = 0; 833 bond_set_slave_link_state(new_active, BOND_LINK_UP); 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 } 937 938 #ifdef CONFIG_NET_POLL_CONTROLLER 939 static inline int slave_enable_netpoll(struct slave *slave) 940 { 941 struct netpoll *np; 942 int err = 0; 943 944 np = kzalloc(sizeof(*np), GFP_KERNEL); 945 err = -ENOMEM; 946 if (!np) 947 goto out; 948 949 err = __netpoll_setup(np, slave->dev); 950 if (err) { 951 kfree(np); 952 goto out; 953 } 954 slave->np = np; 955 out: 956 return err; 957 } 958 static inline void slave_disable_netpoll(struct slave *slave) 959 { 960 struct netpoll *np = slave->np; 961 962 if (!np) 963 return; 964 965 slave->np = NULL; 966 __netpoll_free_async(np); 967 } 968 969 static void bond_poll_controller(struct net_device *bond_dev) 970 { 971 struct bonding *bond = netdev_priv(bond_dev); 972 struct slave *slave = NULL; 973 struct list_head *iter; 974 struct ad_info ad_info; 975 struct netpoll_info *ni; 976 const struct net_device_ops *ops; 977 978 if (BOND_MODE(bond) == BOND_MODE_8023AD) 979 if (bond_3ad_get_active_agg_info(bond, &ad_info)) 980 return; 981 982 bond_for_each_slave_rcu(bond, slave, iter) { 983 ops = slave->dev->netdev_ops; 984 if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller) 985 continue; 986 987 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 988 struct aggregator *agg = 989 SLAVE_AD_INFO(slave)->port.aggregator; 990 991 if (agg && 992 agg->aggregator_identifier != ad_info.aggregator_id) 993 continue; 994 } 995 996 ni = rcu_dereference_bh(slave->dev->npinfo); 997 if (down_trylock(&ni->dev_lock)) 998 continue; 999 ops->ndo_poll_controller(slave->dev); 1000 up(&ni->dev_lock); 1001 } 1002 } 1003 1004 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1005 { 1006 struct bonding *bond = netdev_priv(bond_dev); 1007 struct list_head *iter; 1008 struct slave *slave; 1009 1010 bond_for_each_slave(bond, slave, iter) 1011 if (bond_slave_is_up(slave)) 1012 slave_disable_netpoll(slave); 1013 } 1014 1015 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) 1016 { 1017 struct bonding *bond = netdev_priv(dev); 1018 struct list_head *iter; 1019 struct slave *slave; 1020 int err = 0; 1021 1022 bond_for_each_slave(bond, slave, iter) { 1023 err = slave_enable_netpoll(slave); 1024 if (err) { 1025 bond_netpoll_cleanup(dev); 1026 break; 1027 } 1028 } 1029 return err; 1030 } 1031 #else 1032 static inline int slave_enable_netpoll(struct slave *slave) 1033 { 1034 return 0; 1035 } 1036 static inline void slave_disable_netpoll(struct slave *slave) 1037 { 1038 } 1039 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1040 { 1041 } 1042 #endif 1043 1044 /*---------------------------------- IOCTL ----------------------------------*/ 1045 1046 static netdev_features_t bond_fix_features(struct net_device *dev, 1047 netdev_features_t features) 1048 { 1049 struct bonding *bond = netdev_priv(dev); 1050 struct list_head *iter; 1051 netdev_features_t mask; 1052 struct slave *slave; 1053 1054 mask = features; 1055 1056 features &= ~NETIF_F_ONE_FOR_ALL; 1057 features |= NETIF_F_ALL_FOR_ALL; 1058 1059 bond_for_each_slave(bond, slave, iter) { 1060 features = netdev_increment_features(features, 1061 slave->dev->features, 1062 mask); 1063 } 1064 features = netdev_add_tso_features(features, mask); 1065 1066 return features; 1067 } 1068 1069 #define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \ 1070 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \ 1071 NETIF_F_HIGHDMA | NETIF_F_LRO) 1072 1073 #define BOND_ENC_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | NETIF_F_RXCSUM |\ 1074 NETIF_F_TSO) 1075 1076 static void bond_compute_features(struct bonding *bond) 1077 { 1078 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE | 1079 IFF_XMIT_DST_RELEASE_PERM; 1080 netdev_features_t vlan_features = BOND_VLAN_FEATURES; 1081 netdev_features_t enc_features = BOND_ENC_FEATURES; 1082 struct net_device *bond_dev = bond->dev; 1083 struct list_head *iter; 1084 struct slave *slave; 1085 unsigned short max_hard_header_len = ETH_HLEN; 1086 unsigned int gso_max_size = GSO_MAX_SIZE; 1087 u16 gso_max_segs = GSO_MAX_SEGS; 1088 1089 if (!bond_has_slaves(bond)) 1090 goto done; 1091 vlan_features &= NETIF_F_ALL_FOR_ALL; 1092 1093 bond_for_each_slave(bond, slave, iter) { 1094 vlan_features = netdev_increment_features(vlan_features, 1095 slave->dev->vlan_features, BOND_VLAN_FEATURES); 1096 1097 enc_features = netdev_increment_features(enc_features, 1098 slave->dev->hw_enc_features, 1099 BOND_ENC_FEATURES); 1100 dst_release_flag &= slave->dev->priv_flags; 1101 if (slave->dev->hard_header_len > max_hard_header_len) 1102 max_hard_header_len = slave->dev->hard_header_len; 1103 1104 gso_max_size = min(gso_max_size, slave->dev->gso_max_size); 1105 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs); 1106 } 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->hard_header_len = max_hard_header_len; 1112 bond_dev->gso_max_segs = gso_max_segs; 1113 netif_set_gso_max_size(bond_dev, gso_max_size); 1114 1115 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1116 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) && 1117 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM)) 1118 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE; 1119 1120 netdev_change_features(bond_dev); 1121 } 1122 1123 static void bond_setup_by_slave(struct net_device *bond_dev, 1124 struct net_device *slave_dev) 1125 { 1126 bond_dev->header_ops = slave_dev->header_ops; 1127 1128 bond_dev->type = slave_dev->type; 1129 bond_dev->hard_header_len = slave_dev->hard_header_len; 1130 bond_dev->addr_len = slave_dev->addr_len; 1131 1132 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1133 slave_dev->addr_len); 1134 } 1135 1136 /* On bonding slaves other than the currently active slave, suppress 1137 * duplicates except for alb non-mcast/bcast. 1138 */ 1139 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1140 struct slave *slave, 1141 struct bonding *bond) 1142 { 1143 if (bond_is_slave_inactive(slave)) { 1144 if (BOND_MODE(bond) == BOND_MODE_ALB && 1145 skb->pkt_type != PACKET_BROADCAST && 1146 skb->pkt_type != PACKET_MULTICAST) 1147 return false; 1148 return true; 1149 } 1150 return false; 1151 } 1152 1153 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1154 { 1155 struct sk_buff *skb = *pskb; 1156 struct slave *slave; 1157 struct bonding *bond; 1158 int (*recv_probe)(const struct sk_buff *, struct bonding *, 1159 struct slave *); 1160 int ret = RX_HANDLER_ANOTHER; 1161 1162 skb = skb_share_check(skb, GFP_ATOMIC); 1163 if (unlikely(!skb)) 1164 return RX_HANDLER_CONSUMED; 1165 1166 *pskb = skb; 1167 1168 slave = bond_slave_get_rcu(skb->dev); 1169 bond = slave->bond; 1170 1171 recv_probe = ACCESS_ONCE(bond->recv_probe); 1172 if (recv_probe) { 1173 ret = recv_probe(skb, bond, slave); 1174 if (ret == RX_HANDLER_CONSUMED) { 1175 consume_skb(skb); 1176 return ret; 1177 } 1178 } 1179 1180 if (bond_should_deliver_exact_match(skb, slave, bond)) { 1181 return RX_HANDLER_EXACT; 1182 } 1183 1184 skb->dev = bond->dev; 1185 1186 if (BOND_MODE(bond) == BOND_MODE_ALB && 1187 bond->dev->priv_flags & IFF_BRIDGE_PORT && 1188 skb->pkt_type == PACKET_HOST) { 1189 1190 if (unlikely(skb_cow_head(skb, 1191 skb->data - skb_mac_header(skb)))) { 1192 kfree_skb(skb); 1193 return RX_HANDLER_CONSUMED; 1194 } 1195 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr); 1196 } 1197 1198 return ret; 1199 } 1200 1201 static int bond_master_upper_dev_link(struct net_device *bond_dev, 1202 struct net_device *slave_dev, 1203 struct slave *slave) 1204 { 1205 int err; 1206 1207 err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, slave); 1208 if (err) 1209 return err; 1210 slave_dev->flags |= IFF_SLAVE; 1211 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL); 1212 return 0; 1213 } 1214 1215 static void bond_upper_dev_unlink(struct net_device *bond_dev, 1216 struct net_device *slave_dev) 1217 { 1218 netdev_upper_dev_unlink(slave_dev, bond_dev); 1219 slave_dev->flags &= ~IFF_SLAVE; 1220 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL); 1221 } 1222 1223 static struct slave *bond_alloc_slave(struct bonding *bond) 1224 { 1225 struct slave *slave = NULL; 1226 1227 slave = kzalloc(sizeof(struct slave), GFP_KERNEL); 1228 if (!slave) 1229 return NULL; 1230 1231 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1232 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info), 1233 GFP_KERNEL); 1234 if (!SLAVE_AD_INFO(slave)) { 1235 kfree(slave); 1236 return NULL; 1237 } 1238 } 1239 return slave; 1240 } 1241 1242 static void bond_free_slave(struct slave *slave) 1243 { 1244 struct bonding *bond = bond_get_bond_by_slave(slave); 1245 1246 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1247 kfree(SLAVE_AD_INFO(slave)); 1248 1249 kfree(slave); 1250 } 1251 1252 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info) 1253 { 1254 info->bond_mode = BOND_MODE(bond); 1255 info->miimon = bond->params.miimon; 1256 info->num_slaves = bond->slave_cnt; 1257 } 1258 1259 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info) 1260 { 1261 strcpy(info->slave_name, slave->dev->name); 1262 info->link = slave->link; 1263 info->state = bond_slave_state(slave); 1264 info->link_failure_count = slave->link_failure_count; 1265 } 1266 1267 static void bond_netdev_notify(struct net_device *dev, 1268 struct netdev_bonding_info *info) 1269 { 1270 rtnl_lock(); 1271 netdev_bonding_info_change(dev, info); 1272 rtnl_unlock(); 1273 } 1274 1275 static void bond_netdev_notify_work(struct work_struct *_work) 1276 { 1277 struct netdev_notify_work *w = 1278 container_of(_work, struct netdev_notify_work, work.work); 1279 1280 bond_netdev_notify(w->dev, &w->bonding_info); 1281 dev_put(w->dev); 1282 kfree(w); 1283 } 1284 1285 void bond_queue_slave_event(struct slave *slave) 1286 { 1287 struct bonding *bond = slave->bond; 1288 struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC); 1289 1290 if (!nnw) 1291 return; 1292 1293 dev_hold(slave->dev); 1294 nnw->dev = slave->dev; 1295 bond_fill_ifslave(slave, &nnw->bonding_info.slave); 1296 bond_fill_ifbond(bond, &nnw->bonding_info.master); 1297 INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work); 1298 1299 queue_delayed_work(slave->bond->wq, &nnw->work, 0); 1300 } 1301 1302 /* enslave device <slave> to bond device <master> */ 1303 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev) 1304 { 1305 struct bonding *bond = netdev_priv(bond_dev); 1306 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1307 struct slave *new_slave = NULL, *prev_slave; 1308 struct sockaddr addr; 1309 int link_reporting; 1310 int res = 0, i; 1311 1312 if (!bond->params.use_carrier && 1313 slave_dev->ethtool_ops->get_link == NULL && 1314 slave_ops->ndo_do_ioctl == NULL) { 1315 netdev_warn(bond_dev, "no link monitoring support for %s\n", 1316 slave_dev->name); 1317 } 1318 1319 /* already enslaved */ 1320 if (slave_dev->flags & IFF_SLAVE) { 1321 netdev_dbg(bond_dev, "Error: Device was already enslaved\n"); 1322 return -EBUSY; 1323 } 1324 1325 if (bond_dev == slave_dev) { 1326 netdev_err(bond_dev, "cannot enslave bond to itself.\n"); 1327 return -EPERM; 1328 } 1329 1330 /* vlan challenged mutual exclusion */ 1331 /* no need to lock since we're protected by rtnl_lock */ 1332 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1333 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n", 1334 slave_dev->name); 1335 if (vlan_uses_dev(bond_dev)) { 1336 netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n", 1337 slave_dev->name, bond_dev->name); 1338 return -EPERM; 1339 } else { 1340 netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n", 1341 slave_dev->name, slave_dev->name, 1342 bond_dev->name); 1343 } 1344 } else { 1345 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n", 1346 slave_dev->name); 1347 } 1348 1349 /* Old ifenslave binaries are no longer supported. These can 1350 * be identified with moderate accuracy by the state of the slave: 1351 * the current ifenslave will set the interface down prior to 1352 * enslaving it; the old ifenslave will not. 1353 */ 1354 if ((slave_dev->flags & IFF_UP)) { 1355 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n", 1356 slave_dev->name); 1357 res = -EPERM; 1358 goto err_undo_flags; 1359 } 1360 1361 /* set bonding device ether type by slave - bonding netdevices are 1362 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1363 * there is a need to override some of the type dependent attribs/funcs. 1364 * 1365 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1366 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1367 */ 1368 if (!bond_has_slaves(bond)) { 1369 if (bond_dev->type != slave_dev->type) { 1370 netdev_dbg(bond_dev, "change device type from %d to %d\n", 1371 bond_dev->type, slave_dev->type); 1372 1373 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, 1374 bond_dev); 1375 res = notifier_to_errno(res); 1376 if (res) { 1377 netdev_err(bond_dev, "refused to change device type\n"); 1378 res = -EBUSY; 1379 goto err_undo_flags; 1380 } 1381 1382 /* Flush unicast and multicast addresses */ 1383 dev_uc_flush(bond_dev); 1384 dev_mc_flush(bond_dev); 1385 1386 if (slave_dev->type != ARPHRD_ETHER) 1387 bond_setup_by_slave(bond_dev, slave_dev); 1388 else { 1389 ether_setup(bond_dev); 1390 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1391 } 1392 1393 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, 1394 bond_dev); 1395 } 1396 } else if (bond_dev->type != slave_dev->type) { 1397 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n", 1398 slave_dev->name, slave_dev->type, bond_dev->type); 1399 res = -EINVAL; 1400 goto err_undo_flags; 1401 } 1402 1403 if (slave_ops->ndo_set_mac_address == NULL) { 1404 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n"); 1405 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP && 1406 bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1407 if (!bond_has_slaves(bond)) { 1408 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1409 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n"); 1410 } else { 1411 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"); 1412 res = -EOPNOTSUPP; 1413 goto err_undo_flags; 1414 } 1415 } 1416 } 1417 1418 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1419 1420 /* If this is the first slave, then we need to set the master's hardware 1421 * address to be the same as the slave's. 1422 */ 1423 if (!bond_has_slaves(bond) && 1424 bond->dev->addr_assign_type == NET_ADDR_RANDOM) 1425 bond_set_dev_addr(bond->dev, slave_dev); 1426 1427 new_slave = bond_alloc_slave(bond); 1428 if (!new_slave) { 1429 res = -ENOMEM; 1430 goto err_undo_flags; 1431 } 1432 1433 new_slave->bond = bond; 1434 new_slave->dev = slave_dev; 1435 /* Set the new_slave's queue_id to be zero. Queue ID mapping 1436 * is set via sysfs or module option if desired. 1437 */ 1438 new_slave->queue_id = 0; 1439 1440 /* Save slave's original mtu and then set it to match the bond */ 1441 new_slave->original_mtu = slave_dev->mtu; 1442 res = dev_set_mtu(slave_dev, bond->dev->mtu); 1443 if (res) { 1444 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res); 1445 goto err_free; 1446 } 1447 1448 /* Save slave's original ("permanent") mac address for modes 1449 * that need it, and for restoring it upon release, and then 1450 * set it to the master's address 1451 */ 1452 ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr); 1453 1454 if (!bond->params.fail_over_mac || 1455 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1456 /* Set slave to master's mac address. The application already 1457 * set the master's mac address to that of the first slave 1458 */ 1459 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 1460 addr.sa_family = slave_dev->type; 1461 res = dev_set_mac_address(slave_dev, &addr); 1462 if (res) { 1463 netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res); 1464 goto err_restore_mtu; 1465 } 1466 } 1467 1468 /* open the slave since the application closed it */ 1469 res = dev_open(slave_dev); 1470 if (res) { 1471 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name); 1472 goto err_restore_mac; 1473 } 1474 1475 slave_dev->priv_flags |= IFF_BONDING; 1476 /* initialize slave stats */ 1477 dev_get_stats(new_slave->dev, &new_slave->slave_stats); 1478 1479 if (bond_is_lb(bond)) { 1480 /* bond_alb_init_slave() must be called before all other stages since 1481 * it might fail and we do not want to have to undo everything 1482 */ 1483 res = bond_alb_init_slave(bond, new_slave); 1484 if (res) 1485 goto err_close; 1486 } 1487 1488 /* If the mode uses primary, then the following is handled by 1489 * bond_change_active_slave(). 1490 */ 1491 if (!bond_uses_primary(bond)) { 1492 /* set promiscuity level to new slave */ 1493 if (bond_dev->flags & IFF_PROMISC) { 1494 res = dev_set_promiscuity(slave_dev, 1); 1495 if (res) 1496 goto err_close; 1497 } 1498 1499 /* set allmulti level to new slave */ 1500 if (bond_dev->flags & IFF_ALLMULTI) { 1501 res = dev_set_allmulti(slave_dev, 1); 1502 if (res) 1503 goto err_close; 1504 } 1505 1506 netif_addr_lock_bh(bond_dev); 1507 1508 dev_mc_sync_multiple(slave_dev, bond_dev); 1509 dev_uc_sync_multiple(slave_dev, bond_dev); 1510 1511 netif_addr_unlock_bh(bond_dev); 1512 } 1513 1514 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1515 /* add lacpdu mc addr to mc list */ 1516 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 1517 1518 dev_mc_add(slave_dev, lacpdu_multicast); 1519 } 1520 1521 res = vlan_vids_add_by_dev(slave_dev, bond_dev); 1522 if (res) { 1523 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n", 1524 slave_dev->name); 1525 goto err_close; 1526 } 1527 1528 prev_slave = bond_last_slave(bond); 1529 1530 new_slave->delay = 0; 1531 new_slave->link_failure_count = 0; 1532 1533 bond_update_speed_duplex(new_slave); 1534 1535 new_slave->last_rx = jiffies - 1536 (msecs_to_jiffies(bond->params.arp_interval) + 1); 1537 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) 1538 new_slave->target_last_arp_rx[i] = new_slave->last_rx; 1539 1540 if (bond->params.miimon && !bond->params.use_carrier) { 1541 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 1542 1543 if ((link_reporting == -1) && !bond->params.arp_interval) { 1544 /* miimon is set but a bonded network driver 1545 * does not support ETHTOOL/MII and 1546 * arp_interval is not set. Note: if 1547 * use_carrier is enabled, we will never go 1548 * here (because netif_carrier is always 1549 * supported); thus, we don't need to change 1550 * the messages for netif_carrier. 1551 */ 1552 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", 1553 slave_dev->name); 1554 } else if (link_reporting == -1) { 1555 /* unable get link status using mii/ethtool */ 1556 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", 1557 slave_dev->name); 1558 } 1559 } 1560 1561 /* check for initial state */ 1562 if (bond->params.miimon) { 1563 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { 1564 if (bond->params.updelay) { 1565 bond_set_slave_link_state(new_slave, 1566 BOND_LINK_BACK); 1567 new_slave->delay = bond->params.updelay; 1568 } else { 1569 bond_set_slave_link_state(new_slave, 1570 BOND_LINK_UP); 1571 } 1572 } else { 1573 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN); 1574 } 1575 } else if (bond->params.arp_interval) { 1576 bond_set_slave_link_state(new_slave, 1577 (netif_carrier_ok(slave_dev) ? 1578 BOND_LINK_UP : BOND_LINK_DOWN)); 1579 } else { 1580 bond_set_slave_link_state(new_slave, BOND_LINK_UP); 1581 } 1582 1583 if (new_slave->link != BOND_LINK_DOWN) 1584 new_slave->last_link_up = jiffies; 1585 netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n", 1586 new_slave->link == BOND_LINK_DOWN ? "DOWN" : 1587 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); 1588 1589 if (bond_uses_primary(bond) && bond->params.primary[0]) { 1590 /* if there is a primary slave, remember it */ 1591 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 1592 rcu_assign_pointer(bond->primary_slave, new_slave); 1593 bond->force_primary = true; 1594 } 1595 } 1596 1597 switch (BOND_MODE(bond)) { 1598 case BOND_MODE_ACTIVEBACKUP: 1599 bond_set_slave_inactive_flags(new_slave, 1600 BOND_SLAVE_NOTIFY_NOW); 1601 break; 1602 case BOND_MODE_8023AD: 1603 /* in 802.3ad mode, the internal mechanism 1604 * will activate the slaves in the selected 1605 * aggregator 1606 */ 1607 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 1608 /* if this is the first slave */ 1609 if (!prev_slave) { 1610 SLAVE_AD_INFO(new_slave)->id = 1; 1611 /* Initialize AD with the number of times that the AD timer is called in 1 second 1612 * can be called only after the mac address of the bond is set 1613 */ 1614 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL); 1615 } else { 1616 SLAVE_AD_INFO(new_slave)->id = 1617 SLAVE_AD_INFO(prev_slave)->id + 1; 1618 } 1619 1620 bond_3ad_bind_slave(new_slave); 1621 break; 1622 case BOND_MODE_TLB: 1623 case BOND_MODE_ALB: 1624 bond_set_active_slave(new_slave); 1625 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 1626 break; 1627 default: 1628 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n"); 1629 1630 /* always active in trunk mode */ 1631 bond_set_active_slave(new_slave); 1632 1633 /* In trunking mode there is little meaning to curr_active_slave 1634 * anyway (it holds no special properties of the bond device), 1635 * so we can change it without calling change_active_interface() 1636 */ 1637 if (!rcu_access_pointer(bond->curr_active_slave) && 1638 new_slave->link == BOND_LINK_UP) 1639 rcu_assign_pointer(bond->curr_active_slave, new_slave); 1640 1641 break; 1642 } /* switch(bond_mode) */ 1643 1644 #ifdef CONFIG_NET_POLL_CONTROLLER 1645 slave_dev->npinfo = bond->dev->npinfo; 1646 if (slave_dev->npinfo) { 1647 if (slave_enable_netpoll(new_slave)) { 1648 netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n"); 1649 res = -EBUSY; 1650 goto err_detach; 1651 } 1652 } 1653 #endif 1654 1655 if (!(bond_dev->features & NETIF_F_LRO)) 1656 dev_disable_lro(slave_dev); 1657 1658 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 1659 new_slave); 1660 if (res) { 1661 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res); 1662 goto err_detach; 1663 } 1664 1665 res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave); 1666 if (res) { 1667 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res); 1668 goto err_unregister; 1669 } 1670 1671 res = bond_sysfs_slave_add(new_slave); 1672 if (res) { 1673 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res); 1674 goto err_upper_unlink; 1675 } 1676 1677 bond->slave_cnt++; 1678 bond_compute_features(bond); 1679 bond_set_carrier(bond); 1680 1681 if (bond_uses_primary(bond)) { 1682 block_netpoll_tx(); 1683 bond_select_active_slave(bond); 1684 unblock_netpoll_tx(); 1685 } 1686 1687 if (bond_mode_uses_xmit_hash(bond)) 1688 bond_update_slave_arr(bond, NULL); 1689 1690 netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n", 1691 slave_dev->name, 1692 bond_is_active_slave(new_slave) ? "an active" : "a backup", 1693 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down"); 1694 1695 /* enslave is successful */ 1696 bond_queue_slave_event(new_slave); 1697 return 0; 1698 1699 /* Undo stages on error */ 1700 err_upper_unlink: 1701 bond_upper_dev_unlink(bond_dev, slave_dev); 1702 1703 err_unregister: 1704 netdev_rx_handler_unregister(slave_dev); 1705 1706 err_detach: 1707 if (!bond_uses_primary(bond)) 1708 bond_hw_addr_flush(bond_dev, slave_dev); 1709 1710 vlan_vids_del_by_dev(slave_dev, bond_dev); 1711 if (rcu_access_pointer(bond->primary_slave) == new_slave) 1712 RCU_INIT_POINTER(bond->primary_slave, NULL); 1713 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) { 1714 block_netpoll_tx(); 1715 bond_change_active_slave(bond, NULL); 1716 bond_select_active_slave(bond); 1717 unblock_netpoll_tx(); 1718 } 1719 /* either primary_slave or curr_active_slave might've changed */ 1720 synchronize_rcu(); 1721 slave_disable_netpoll(new_slave); 1722 1723 err_close: 1724 slave_dev->priv_flags &= ~IFF_BONDING; 1725 dev_close(slave_dev); 1726 1727 err_restore_mac: 1728 if (!bond->params.fail_over_mac || 1729 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1730 /* XXX TODO - fom follow mode needs to change master's 1731 * MAC if this slave's MAC is in use by the bond, or at 1732 * least print a warning. 1733 */ 1734 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr); 1735 addr.sa_family = slave_dev->type; 1736 dev_set_mac_address(slave_dev, &addr); 1737 } 1738 1739 err_restore_mtu: 1740 dev_set_mtu(slave_dev, new_slave->original_mtu); 1741 1742 err_free: 1743 bond_free_slave(new_slave); 1744 1745 err_undo_flags: 1746 /* Enslave of first slave has failed and we need to fix master's mac */ 1747 if (!bond_has_slaves(bond)) { 1748 if (ether_addr_equal_64bits(bond_dev->dev_addr, 1749 slave_dev->dev_addr)) 1750 eth_hw_addr_random(bond_dev); 1751 if (bond_dev->type != ARPHRD_ETHER) { 1752 ether_setup(bond_dev); 1753 bond_dev->flags |= IFF_MASTER; 1754 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1755 } 1756 } 1757 1758 return res; 1759 } 1760 1761 /* Try to release the slave device <slave> from the bond device <master> 1762 * It is legal to access curr_active_slave without a lock because all the function 1763 * is RTNL-locked. If "all" is true it means that the function is being called 1764 * while destroying a bond interface and all slaves are being released. 1765 * 1766 * The rules for slave state should be: 1767 * for Active/Backup: 1768 * Active stays on all backups go down 1769 * for Bonded connections: 1770 * The first up interface should be left on and all others downed. 1771 */ 1772 static int __bond_release_one(struct net_device *bond_dev, 1773 struct net_device *slave_dev, 1774 bool all) 1775 { 1776 struct bonding *bond = netdev_priv(bond_dev); 1777 struct slave *slave, *oldcurrent; 1778 struct sockaddr addr; 1779 int old_flags = bond_dev->flags; 1780 netdev_features_t old_features = bond_dev->features; 1781 1782 /* slave is not a slave or master is not master of this slave */ 1783 if (!(slave_dev->flags & IFF_SLAVE) || 1784 !netdev_has_upper_dev(slave_dev, bond_dev)) { 1785 netdev_dbg(bond_dev, "cannot release %s\n", 1786 slave_dev->name); 1787 return -EINVAL; 1788 } 1789 1790 block_netpoll_tx(); 1791 1792 slave = bond_get_slave_by_dev(bond, slave_dev); 1793 if (!slave) { 1794 /* not a slave of this bond */ 1795 netdev_info(bond_dev, "%s not enslaved\n", 1796 slave_dev->name); 1797 unblock_netpoll_tx(); 1798 return -EINVAL; 1799 } 1800 1801 bond_sysfs_slave_del(slave); 1802 1803 /* recompute stats just before removing the slave */ 1804 bond_get_stats(bond->dev, &bond->bond_stats); 1805 1806 bond_upper_dev_unlink(bond_dev, slave_dev); 1807 /* unregister rx_handler early so bond_handle_frame wouldn't be called 1808 * for this slave anymore. 1809 */ 1810 netdev_rx_handler_unregister(slave_dev); 1811 1812 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1813 bond_3ad_unbind_slave(slave); 1814 1815 if (bond_mode_uses_xmit_hash(bond)) 1816 bond_update_slave_arr(bond, slave); 1817 1818 netdev_info(bond_dev, "Releasing %s interface %s\n", 1819 bond_is_active_slave(slave) ? "active" : "backup", 1820 slave_dev->name); 1821 1822 oldcurrent = rcu_access_pointer(bond->curr_active_slave); 1823 1824 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 1825 1826 if (!all && (!bond->params.fail_over_mac || 1827 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) { 1828 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) && 1829 bond_has_slaves(bond)) 1830 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", 1831 slave_dev->name, slave->perm_hwaddr, 1832 bond_dev->name, slave_dev->name); 1833 } 1834 1835 if (rtnl_dereference(bond->primary_slave) == slave) 1836 RCU_INIT_POINTER(bond->primary_slave, NULL); 1837 1838 if (oldcurrent == slave) 1839 bond_change_active_slave(bond, NULL); 1840 1841 if (bond_is_lb(bond)) { 1842 /* Must be called only after the slave has been 1843 * detached from the list and the curr_active_slave 1844 * has been cleared (if our_slave == old_current), 1845 * but before a new active slave is selected. 1846 */ 1847 bond_alb_deinit_slave(bond, slave); 1848 } 1849 1850 if (all) { 1851 RCU_INIT_POINTER(bond->curr_active_slave, NULL); 1852 } else if (oldcurrent == slave) { 1853 /* Note that we hold RTNL over this sequence, so there 1854 * is no concern that another slave add/remove event 1855 * will interfere. 1856 */ 1857 bond_select_active_slave(bond); 1858 } 1859 1860 if (!bond_has_slaves(bond)) { 1861 bond_set_carrier(bond); 1862 eth_hw_addr_random(bond_dev); 1863 } 1864 1865 unblock_netpoll_tx(); 1866 synchronize_rcu(); 1867 bond->slave_cnt--; 1868 1869 if (!bond_has_slaves(bond)) { 1870 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 1871 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev); 1872 } 1873 1874 bond_compute_features(bond); 1875 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 1876 (old_features & NETIF_F_VLAN_CHALLENGED)) 1877 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n", 1878 slave_dev->name, bond_dev->name); 1879 1880 vlan_vids_del_by_dev(slave_dev, bond_dev); 1881 1882 /* If the mode uses primary, then this case was handled above by 1883 * bond_change_active_slave(..., NULL) 1884 */ 1885 if (!bond_uses_primary(bond)) { 1886 /* unset promiscuity level from slave 1887 * NOTE: The NETDEV_CHANGEADDR call above may change the value 1888 * of the IFF_PROMISC flag in the bond_dev, but we need the 1889 * value of that flag before that change, as that was the value 1890 * when this slave was attached, so we cache at the start of the 1891 * function and use it here. Same goes for ALLMULTI below 1892 */ 1893 if (old_flags & IFF_PROMISC) 1894 dev_set_promiscuity(slave_dev, -1); 1895 1896 /* unset allmulti level from slave */ 1897 if (old_flags & IFF_ALLMULTI) 1898 dev_set_allmulti(slave_dev, -1); 1899 1900 bond_hw_addr_flush(bond_dev, slave_dev); 1901 } 1902 1903 slave_disable_netpoll(slave); 1904 1905 /* close slave before restoring its mac address */ 1906 dev_close(slave_dev); 1907 1908 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE || 1909 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1910 /* restore original ("permanent") mac address */ 1911 ether_addr_copy(addr.sa_data, slave->perm_hwaddr); 1912 addr.sa_family = slave_dev->type; 1913 dev_set_mac_address(slave_dev, &addr); 1914 } 1915 1916 dev_set_mtu(slave_dev, slave->original_mtu); 1917 1918 slave_dev->priv_flags &= ~IFF_BONDING; 1919 1920 bond_free_slave(slave); 1921 1922 return 0; 1923 } 1924 1925 /* A wrapper used because of ndo_del_link */ 1926 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 1927 { 1928 return __bond_release_one(bond_dev, slave_dev, false); 1929 } 1930 1931 /* First release a slave and then destroy the bond if no more slaves are left. 1932 * Must be under rtnl_lock when this function is called. 1933 */ 1934 static int bond_release_and_destroy(struct net_device *bond_dev, 1935 struct net_device *slave_dev) 1936 { 1937 struct bonding *bond = netdev_priv(bond_dev); 1938 int ret; 1939 1940 ret = bond_release(bond_dev, slave_dev); 1941 if (ret == 0 && !bond_has_slaves(bond)) { 1942 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 1943 netdev_info(bond_dev, "Destroying bond %s\n", 1944 bond_dev->name); 1945 bond_remove_proc_entry(bond); 1946 unregister_netdevice(bond_dev); 1947 } 1948 return ret; 1949 } 1950 1951 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info) 1952 { 1953 struct bonding *bond = netdev_priv(bond_dev); 1954 bond_fill_ifbond(bond, info); 1955 return 0; 1956 } 1957 1958 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 1959 { 1960 struct bonding *bond = netdev_priv(bond_dev); 1961 struct list_head *iter; 1962 int i = 0, res = -ENODEV; 1963 struct slave *slave; 1964 1965 bond_for_each_slave(bond, slave, iter) { 1966 if (i++ == (int)info->slave_id) { 1967 res = 0; 1968 bond_fill_ifslave(slave, info); 1969 break; 1970 } 1971 } 1972 1973 return res; 1974 } 1975 1976 /*-------------------------------- Monitoring -------------------------------*/ 1977 1978 /* called with rcu_read_lock() */ 1979 static int bond_miimon_inspect(struct bonding *bond) 1980 { 1981 int link_state, commit = 0; 1982 struct list_head *iter; 1983 struct slave *slave; 1984 bool ignore_updelay; 1985 1986 ignore_updelay = !rcu_dereference(bond->curr_active_slave); 1987 1988 bond_for_each_slave_rcu(bond, slave, iter) { 1989 slave->new_link = BOND_LINK_NOCHANGE; 1990 1991 link_state = bond_check_dev_link(bond, slave->dev, 0); 1992 1993 switch (slave->link) { 1994 case BOND_LINK_UP: 1995 if (link_state) 1996 continue; 1997 1998 bond_set_slave_link_state(slave, BOND_LINK_FAIL); 1999 slave->delay = bond->params.downdelay; 2000 if (slave->delay) { 2001 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n", 2002 (BOND_MODE(bond) == 2003 BOND_MODE_ACTIVEBACKUP) ? 2004 (bond_is_active_slave(slave) ? 2005 "active " : "backup ") : "", 2006 slave->dev->name, 2007 bond->params.downdelay * bond->params.miimon); 2008 } 2009 /*FALLTHRU*/ 2010 case BOND_LINK_FAIL: 2011 if (link_state) { 2012 /* recovered before downdelay expired */ 2013 bond_set_slave_link_state(slave, BOND_LINK_UP); 2014 slave->last_link_up = jiffies; 2015 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n", 2016 (bond->params.downdelay - slave->delay) * 2017 bond->params.miimon, 2018 slave->dev->name); 2019 continue; 2020 } 2021 2022 if (slave->delay <= 0) { 2023 slave->new_link = BOND_LINK_DOWN; 2024 commit++; 2025 continue; 2026 } 2027 2028 slave->delay--; 2029 break; 2030 2031 case BOND_LINK_DOWN: 2032 if (!link_state) 2033 continue; 2034 2035 bond_set_slave_link_state(slave, BOND_LINK_BACK); 2036 slave->delay = bond->params.updelay; 2037 2038 if (slave->delay) { 2039 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n", 2040 slave->dev->name, 2041 ignore_updelay ? 0 : 2042 bond->params.updelay * 2043 bond->params.miimon); 2044 } 2045 /*FALLTHRU*/ 2046 case BOND_LINK_BACK: 2047 if (!link_state) { 2048 bond_set_slave_link_state(slave, 2049 BOND_LINK_DOWN); 2050 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n", 2051 (bond->params.updelay - slave->delay) * 2052 bond->params.miimon, 2053 slave->dev->name); 2054 2055 continue; 2056 } 2057 2058 if (ignore_updelay) 2059 slave->delay = 0; 2060 2061 if (slave->delay <= 0) { 2062 slave->new_link = BOND_LINK_UP; 2063 commit++; 2064 ignore_updelay = false; 2065 continue; 2066 } 2067 2068 slave->delay--; 2069 break; 2070 } 2071 } 2072 2073 return commit; 2074 } 2075 2076 static void bond_miimon_commit(struct bonding *bond) 2077 { 2078 struct list_head *iter; 2079 struct slave *slave, *primary; 2080 2081 bond_for_each_slave(bond, slave, iter) { 2082 switch (slave->new_link) { 2083 case BOND_LINK_NOCHANGE: 2084 continue; 2085 2086 case BOND_LINK_UP: 2087 bond_set_slave_link_state(slave, BOND_LINK_UP); 2088 slave->last_link_up = jiffies; 2089 2090 primary = rtnl_dereference(bond->primary_slave); 2091 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 2092 /* prevent it from being the active one */ 2093 bond_set_backup_slave(slave); 2094 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2095 /* make it immediately active */ 2096 bond_set_active_slave(slave); 2097 } else if (slave != primary) { 2098 /* prevent it from being the active one */ 2099 bond_set_backup_slave(slave); 2100 } 2101 2102 netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n", 2103 slave->dev->name, 2104 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed, 2105 slave->duplex ? "full" : "half"); 2106 2107 /* notify ad that the link status has changed */ 2108 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2109 bond_3ad_handle_link_change(slave, BOND_LINK_UP); 2110 2111 if (bond_is_lb(bond)) 2112 bond_alb_handle_link_change(bond, slave, 2113 BOND_LINK_UP); 2114 2115 if (BOND_MODE(bond) == BOND_MODE_XOR) 2116 bond_update_slave_arr(bond, NULL); 2117 2118 if (!bond->curr_active_slave || slave == primary) 2119 goto do_failover; 2120 2121 continue; 2122 2123 case BOND_LINK_DOWN: 2124 if (slave->link_failure_count < UINT_MAX) 2125 slave->link_failure_count++; 2126 2127 bond_set_slave_link_state(slave, BOND_LINK_DOWN); 2128 2129 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP || 2130 BOND_MODE(bond) == BOND_MODE_8023AD) 2131 bond_set_slave_inactive_flags(slave, 2132 BOND_SLAVE_NOTIFY_NOW); 2133 2134 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n", 2135 slave->dev->name); 2136 2137 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2138 bond_3ad_handle_link_change(slave, 2139 BOND_LINK_DOWN); 2140 2141 if (bond_is_lb(bond)) 2142 bond_alb_handle_link_change(bond, slave, 2143 BOND_LINK_DOWN); 2144 2145 if (BOND_MODE(bond) == BOND_MODE_XOR) 2146 bond_update_slave_arr(bond, NULL); 2147 2148 if (slave == rcu_access_pointer(bond->curr_active_slave)) 2149 goto do_failover; 2150 2151 continue; 2152 2153 default: 2154 netdev_err(bond->dev, "invalid new link %d on slave %s\n", 2155 slave->new_link, slave->dev->name); 2156 slave->new_link = BOND_LINK_NOCHANGE; 2157 2158 continue; 2159 } 2160 2161 do_failover: 2162 block_netpoll_tx(); 2163 bond_select_active_slave(bond); 2164 unblock_netpoll_tx(); 2165 } 2166 2167 bond_set_carrier(bond); 2168 } 2169 2170 /* bond_mii_monitor 2171 * 2172 * Really a wrapper that splits the mii monitor into two phases: an 2173 * inspection, then (if inspection indicates something needs to be done) 2174 * an acquisition of appropriate locks followed by a commit phase to 2175 * implement whatever link state changes are indicated. 2176 */ 2177 static void bond_mii_monitor(struct work_struct *work) 2178 { 2179 struct bonding *bond = container_of(work, struct bonding, 2180 mii_work.work); 2181 bool should_notify_peers = false; 2182 unsigned long delay; 2183 2184 delay = msecs_to_jiffies(bond->params.miimon); 2185 2186 if (!bond_has_slaves(bond)) 2187 goto re_arm; 2188 2189 rcu_read_lock(); 2190 2191 should_notify_peers = bond_should_notify_peers(bond); 2192 2193 if (bond_miimon_inspect(bond)) { 2194 rcu_read_unlock(); 2195 2196 /* Race avoidance with bond_close cancel of workqueue */ 2197 if (!rtnl_trylock()) { 2198 delay = 1; 2199 should_notify_peers = false; 2200 goto re_arm; 2201 } 2202 2203 bond_miimon_commit(bond); 2204 2205 rtnl_unlock(); /* might sleep, hold no other locks */ 2206 } else 2207 rcu_read_unlock(); 2208 2209 re_arm: 2210 if (bond->params.miimon) 2211 queue_delayed_work(bond->wq, &bond->mii_work, delay); 2212 2213 if (should_notify_peers) { 2214 if (!rtnl_trylock()) 2215 return; 2216 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); 2217 rtnl_unlock(); 2218 } 2219 } 2220 2221 static bool bond_has_this_ip(struct bonding *bond, __be32 ip) 2222 { 2223 struct net_device *upper; 2224 struct list_head *iter; 2225 bool ret = false; 2226 2227 if (ip == bond_confirm_addr(bond->dev, 0, ip)) 2228 return true; 2229 2230 rcu_read_lock(); 2231 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) { 2232 if (ip == bond_confirm_addr(upper, 0, ip)) { 2233 ret = true; 2234 break; 2235 } 2236 } 2237 rcu_read_unlock(); 2238 2239 return ret; 2240 } 2241 2242 /* We go to the (large) trouble of VLAN tagging ARP frames because 2243 * switches in VLAN mode (especially if ports are configured as 2244 * "native" to a VLAN) might not pass non-tagged frames. 2245 */ 2246 static void bond_arp_send(struct net_device *slave_dev, int arp_op, 2247 __be32 dest_ip, __be32 src_ip, 2248 struct bond_vlan_tag *tags) 2249 { 2250 struct sk_buff *skb; 2251 struct bond_vlan_tag *outer_tag = tags; 2252 2253 netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n", 2254 arp_op, slave_dev->name, &dest_ip, &src_ip); 2255 2256 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2257 NULL, slave_dev->dev_addr, NULL); 2258 2259 if (!skb) { 2260 net_err_ratelimited("ARP packet allocation failed\n"); 2261 return; 2262 } 2263 2264 if (!tags || tags->vlan_proto == VLAN_N_VID) 2265 goto xmit; 2266 2267 tags++; 2268 2269 /* Go through all the tags backwards and add them to the packet */ 2270 while (tags->vlan_proto != VLAN_N_VID) { 2271 if (!tags->vlan_id) { 2272 tags++; 2273 continue; 2274 } 2275 2276 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n", 2277 ntohs(outer_tag->vlan_proto), tags->vlan_id); 2278 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto, 2279 tags->vlan_id); 2280 if (!skb) { 2281 net_err_ratelimited("failed to insert inner VLAN tag\n"); 2282 return; 2283 } 2284 2285 tags++; 2286 } 2287 /* Set the outer tag */ 2288 if (outer_tag->vlan_id) { 2289 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n", 2290 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id); 2291 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto, 2292 outer_tag->vlan_id); 2293 } 2294 2295 xmit: 2296 arp_xmit(skb); 2297 } 2298 2299 /* Validate the device path between the @start_dev and the @end_dev. 2300 * The path is valid if the @end_dev is reachable through device 2301 * stacking. 2302 * When the path is validated, collect any vlan information in the 2303 * path. 2304 */ 2305 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev, 2306 struct net_device *end_dev, 2307 int level) 2308 { 2309 struct bond_vlan_tag *tags; 2310 struct net_device *upper; 2311 struct list_head *iter; 2312 2313 if (start_dev == end_dev) { 2314 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC); 2315 if (!tags) 2316 return ERR_PTR(-ENOMEM); 2317 tags[level].vlan_proto = VLAN_N_VID; 2318 return tags; 2319 } 2320 2321 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) { 2322 tags = bond_verify_device_path(upper, end_dev, level + 1); 2323 if (IS_ERR_OR_NULL(tags)) { 2324 if (IS_ERR(tags)) 2325 return tags; 2326 continue; 2327 } 2328 if (is_vlan_dev(upper)) { 2329 tags[level].vlan_proto = vlan_dev_vlan_proto(upper); 2330 tags[level].vlan_id = vlan_dev_vlan_id(upper); 2331 } 2332 2333 return tags; 2334 } 2335 2336 return NULL; 2337 } 2338 2339 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2340 { 2341 struct rtable *rt; 2342 struct bond_vlan_tag *tags; 2343 __be32 *targets = bond->params.arp_targets, addr; 2344 int i; 2345 2346 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) { 2347 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]); 2348 tags = NULL; 2349 2350 /* Find out through which dev should the packet go */ 2351 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 2352 RTO_ONLINK, 0); 2353 if (IS_ERR(rt)) { 2354 /* there's no route to target - try to send arp 2355 * probe to generate any traffic (arp_validate=0) 2356 */ 2357 if (bond->params.arp_validate) 2358 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n", 2359 bond->dev->name, 2360 &targets[i]); 2361 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2362 0, tags); 2363 continue; 2364 } 2365 2366 /* bond device itself */ 2367 if (rt->dst.dev == bond->dev) 2368 goto found; 2369 2370 rcu_read_lock(); 2371 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0); 2372 rcu_read_unlock(); 2373 2374 if (!IS_ERR_OR_NULL(tags)) 2375 goto found; 2376 2377 /* Not our device - skip */ 2378 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n", 2379 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL"); 2380 2381 ip_rt_put(rt); 2382 continue; 2383 2384 found: 2385 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0); 2386 ip_rt_put(rt); 2387 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2388 addr, tags); 2389 kfree(tags); 2390 } 2391 } 2392 2393 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 2394 { 2395 int i; 2396 2397 if (!sip || !bond_has_this_ip(bond, tip)) { 2398 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n", 2399 &sip, &tip); 2400 return; 2401 } 2402 2403 i = bond_get_targets_ip(bond->params.arp_targets, sip); 2404 if (i == -1) { 2405 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n", 2406 &sip); 2407 return; 2408 } 2409 slave->last_rx = jiffies; 2410 slave->target_last_arp_rx[i] = jiffies; 2411 } 2412 2413 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, 2414 struct slave *slave) 2415 { 2416 struct arphdr *arp = (struct arphdr *)skb->data; 2417 struct slave *curr_active_slave; 2418 unsigned char *arp_ptr; 2419 __be32 sip, tip; 2420 int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP); 2421 2422 if (!slave_do_arp_validate(bond, slave)) { 2423 if ((slave_do_arp_validate_only(bond) && is_arp) || 2424 !slave_do_arp_validate_only(bond)) 2425 slave->last_rx = jiffies; 2426 return RX_HANDLER_ANOTHER; 2427 } else if (!is_arp) { 2428 return RX_HANDLER_ANOTHER; 2429 } 2430 2431 alen = arp_hdr_len(bond->dev); 2432 2433 netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n", 2434 skb->dev->name); 2435 2436 if (alen > skb_headlen(skb)) { 2437 arp = kmalloc(alen, GFP_ATOMIC); 2438 if (!arp) 2439 goto out_unlock; 2440 if (skb_copy_bits(skb, 0, arp, alen) < 0) 2441 goto out_unlock; 2442 } 2443 2444 if (arp->ar_hln != bond->dev->addr_len || 2445 skb->pkt_type == PACKET_OTHERHOST || 2446 skb->pkt_type == PACKET_LOOPBACK || 2447 arp->ar_hrd != htons(ARPHRD_ETHER) || 2448 arp->ar_pro != htons(ETH_P_IP) || 2449 arp->ar_pln != 4) 2450 goto out_unlock; 2451 2452 arp_ptr = (unsigned char *)(arp + 1); 2453 arp_ptr += bond->dev->addr_len; 2454 memcpy(&sip, arp_ptr, 4); 2455 arp_ptr += 4 + bond->dev->addr_len; 2456 memcpy(&tip, arp_ptr, 4); 2457 2458 netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n", 2459 slave->dev->name, bond_slave_state(slave), 2460 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 2461 &sip, &tip); 2462 2463 curr_active_slave = rcu_dereference(bond->curr_active_slave); 2464 2465 /* Backup slaves won't see the ARP reply, but do come through 2466 * here for each ARP probe (so we swap the sip/tip to validate 2467 * the probe). In a "redundant switch, common router" type of 2468 * configuration, the ARP probe will (hopefully) travel from 2469 * the active, through one switch, the router, then the other 2470 * switch before reaching the backup. 2471 * 2472 * We 'trust' the arp requests if there is an active slave and 2473 * it received valid arp reply(s) after it became active. This 2474 * is done to avoid endless looping when we can't reach the 2475 * arp_ip_target and fool ourselves with our own arp requests. 2476 */ 2477 2478 if (bond_is_active_slave(slave)) 2479 bond_validate_arp(bond, slave, sip, tip); 2480 else if (curr_active_slave && 2481 time_after(slave_last_rx(bond, curr_active_slave), 2482 curr_active_slave->last_link_up)) 2483 bond_validate_arp(bond, slave, tip, sip); 2484 2485 out_unlock: 2486 if (arp != (struct arphdr *)skb->data) 2487 kfree(arp); 2488 return RX_HANDLER_ANOTHER; 2489 } 2490 2491 /* function to verify if we're in the arp_interval timeslice, returns true if 2492 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval + 2493 * arp_interval/2) . the arp_interval/2 is needed for really fast networks. 2494 */ 2495 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 2496 int mod) 2497 { 2498 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2499 2500 return time_in_range(jiffies, 2501 last_act - delta_in_ticks, 2502 last_act + mod * delta_in_ticks + delta_in_ticks/2); 2503 } 2504 2505 /* This function is called regularly to monitor each slave's link 2506 * ensuring that traffic is being sent and received when arp monitoring 2507 * is used in load-balancing mode. if the adapter has been dormant, then an 2508 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 2509 * arp monitoring in active backup mode. 2510 */ 2511 static void bond_loadbalance_arp_mon(struct work_struct *work) 2512 { 2513 struct bonding *bond = container_of(work, struct bonding, 2514 arp_work.work); 2515 struct slave *slave, *oldcurrent; 2516 struct list_head *iter; 2517 int do_failover = 0, slave_state_changed = 0; 2518 2519 if (!bond_has_slaves(bond)) 2520 goto re_arm; 2521 2522 rcu_read_lock(); 2523 2524 oldcurrent = rcu_dereference(bond->curr_active_slave); 2525 /* see if any of the previous devices are up now (i.e. they have 2526 * xmt and rcv traffic). the curr_active_slave does not come into 2527 * the picture unless it is null. also, slave->last_link_up is not 2528 * needed here because we send an arp on each slave and give a slave 2529 * as long as it needs to get the tx/rx within the delta. 2530 * TODO: what about up/down delay in arp mode? it wasn't here before 2531 * so it can wait 2532 */ 2533 bond_for_each_slave_rcu(bond, slave, iter) { 2534 unsigned long trans_start = dev_trans_start(slave->dev); 2535 2536 if (slave->link != BOND_LINK_UP) { 2537 if (bond_time_in_interval(bond, trans_start, 1) && 2538 bond_time_in_interval(bond, slave->last_rx, 1)) { 2539 2540 slave->link = BOND_LINK_UP; 2541 slave_state_changed = 1; 2542 2543 /* primary_slave has no meaning in round-robin 2544 * mode. the window of a slave being up and 2545 * curr_active_slave being null after enslaving 2546 * is closed. 2547 */ 2548 if (!oldcurrent) { 2549 netdev_info(bond->dev, "link status definitely up for interface %s\n", 2550 slave->dev->name); 2551 do_failover = 1; 2552 } else { 2553 netdev_info(bond->dev, "interface %s is now up\n", 2554 slave->dev->name); 2555 } 2556 } 2557 } else { 2558 /* slave->link == BOND_LINK_UP */ 2559 2560 /* not all switches will respond to an arp request 2561 * when the source ip is 0, so don't take the link down 2562 * if we don't know our ip yet 2563 */ 2564 if (!bond_time_in_interval(bond, trans_start, 2) || 2565 !bond_time_in_interval(bond, slave->last_rx, 2)) { 2566 2567 slave->link = BOND_LINK_DOWN; 2568 slave_state_changed = 1; 2569 2570 if (slave->link_failure_count < UINT_MAX) 2571 slave->link_failure_count++; 2572 2573 netdev_info(bond->dev, "interface %s is now down\n", 2574 slave->dev->name); 2575 2576 if (slave == oldcurrent) 2577 do_failover = 1; 2578 } 2579 } 2580 2581 /* note: if switch is in round-robin mode, all links 2582 * must tx arp to ensure all links rx an arp - otherwise 2583 * links may oscillate or not come up at all; if switch is 2584 * in something like xor mode, there is nothing we can 2585 * do - all replies will be rx'ed on same link causing slaves 2586 * to be unstable during low/no traffic periods 2587 */ 2588 if (bond_slave_is_up(slave)) 2589 bond_arp_send_all(bond, slave); 2590 } 2591 2592 rcu_read_unlock(); 2593 2594 if (do_failover || slave_state_changed) { 2595 if (!rtnl_trylock()) 2596 goto re_arm; 2597 2598 if (slave_state_changed) { 2599 bond_slave_state_change(bond); 2600 if (BOND_MODE(bond) == BOND_MODE_XOR) 2601 bond_update_slave_arr(bond, NULL); 2602 } 2603 if (do_failover) { 2604 block_netpoll_tx(); 2605 bond_select_active_slave(bond); 2606 unblock_netpoll_tx(); 2607 } 2608 rtnl_unlock(); 2609 } 2610 2611 re_arm: 2612 if (bond->params.arp_interval) 2613 queue_delayed_work(bond->wq, &bond->arp_work, 2614 msecs_to_jiffies(bond->params.arp_interval)); 2615 } 2616 2617 /* Called to inspect slaves for active-backup mode ARP monitor link state 2618 * changes. Sets new_link in slaves to specify what action should take 2619 * place for the slave. Returns 0 if no changes are found, >0 if changes 2620 * to link states must be committed. 2621 * 2622 * Called with rcu_read_lock held. 2623 */ 2624 static int bond_ab_arp_inspect(struct bonding *bond) 2625 { 2626 unsigned long trans_start, last_rx; 2627 struct list_head *iter; 2628 struct slave *slave; 2629 int commit = 0; 2630 2631 bond_for_each_slave_rcu(bond, slave, iter) { 2632 slave->new_link = BOND_LINK_NOCHANGE; 2633 last_rx = slave_last_rx(bond, slave); 2634 2635 if (slave->link != BOND_LINK_UP) { 2636 if (bond_time_in_interval(bond, last_rx, 1)) { 2637 slave->new_link = BOND_LINK_UP; 2638 commit++; 2639 } 2640 continue; 2641 } 2642 2643 /* Give slaves 2*delta after being enslaved or made 2644 * active. This avoids bouncing, as the last receive 2645 * times need a full ARP monitor cycle to be updated. 2646 */ 2647 if (bond_time_in_interval(bond, slave->last_link_up, 2)) 2648 continue; 2649 2650 /* Backup slave is down if: 2651 * - No current_arp_slave AND 2652 * - more than 3*delta since last receive AND 2653 * - the bond has an IP address 2654 * 2655 * Note: a non-null current_arp_slave indicates 2656 * the curr_active_slave went down and we are 2657 * searching for a new one; under this condition 2658 * we only take the curr_active_slave down - this 2659 * gives each slave a chance to tx/rx traffic 2660 * before being taken out 2661 */ 2662 if (!bond_is_active_slave(slave) && 2663 !rcu_access_pointer(bond->current_arp_slave) && 2664 !bond_time_in_interval(bond, last_rx, 3)) { 2665 slave->new_link = BOND_LINK_DOWN; 2666 commit++; 2667 } 2668 2669 /* Active slave is down if: 2670 * - more than 2*delta since transmitting OR 2671 * - (more than 2*delta since receive AND 2672 * the bond has an IP address) 2673 */ 2674 trans_start = dev_trans_start(slave->dev); 2675 if (bond_is_active_slave(slave) && 2676 (!bond_time_in_interval(bond, trans_start, 2) || 2677 !bond_time_in_interval(bond, last_rx, 2))) { 2678 slave->new_link = BOND_LINK_DOWN; 2679 commit++; 2680 } 2681 } 2682 2683 return commit; 2684 } 2685 2686 /* Called to commit link state changes noted by inspection step of 2687 * active-backup mode ARP monitor. 2688 * 2689 * Called with RTNL hold. 2690 */ 2691 static void bond_ab_arp_commit(struct bonding *bond) 2692 { 2693 unsigned long trans_start; 2694 struct list_head *iter; 2695 struct slave *slave; 2696 2697 bond_for_each_slave(bond, slave, iter) { 2698 switch (slave->new_link) { 2699 case BOND_LINK_NOCHANGE: 2700 continue; 2701 2702 case BOND_LINK_UP: 2703 trans_start = dev_trans_start(slave->dev); 2704 if (rtnl_dereference(bond->curr_active_slave) != slave || 2705 (!rtnl_dereference(bond->curr_active_slave) && 2706 bond_time_in_interval(bond, trans_start, 1))) { 2707 struct slave *current_arp_slave; 2708 2709 current_arp_slave = rtnl_dereference(bond->current_arp_slave); 2710 bond_set_slave_link_state(slave, BOND_LINK_UP); 2711 if (current_arp_slave) { 2712 bond_set_slave_inactive_flags( 2713 current_arp_slave, 2714 BOND_SLAVE_NOTIFY_NOW); 2715 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2716 } 2717 2718 netdev_info(bond->dev, "link status definitely up for interface %s\n", 2719 slave->dev->name); 2720 2721 if (!rtnl_dereference(bond->curr_active_slave) || 2722 slave == rtnl_dereference(bond->primary_slave)) 2723 goto do_failover; 2724 2725 } 2726 2727 continue; 2728 2729 case BOND_LINK_DOWN: 2730 if (slave->link_failure_count < UINT_MAX) 2731 slave->link_failure_count++; 2732 2733 bond_set_slave_link_state(slave, BOND_LINK_DOWN); 2734 bond_set_slave_inactive_flags(slave, 2735 BOND_SLAVE_NOTIFY_NOW); 2736 2737 netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n", 2738 slave->dev->name); 2739 2740 if (slave == rtnl_dereference(bond->curr_active_slave)) { 2741 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2742 goto do_failover; 2743 } 2744 2745 continue; 2746 2747 default: 2748 netdev_err(bond->dev, "impossible: new_link %d on slave %s\n", 2749 slave->new_link, slave->dev->name); 2750 continue; 2751 } 2752 2753 do_failover: 2754 block_netpoll_tx(); 2755 bond_select_active_slave(bond); 2756 unblock_netpoll_tx(); 2757 } 2758 2759 bond_set_carrier(bond); 2760 } 2761 2762 /* Send ARP probes for active-backup mode ARP monitor. 2763 * 2764 * Called with rcu_read_lock held. 2765 */ 2766 static bool bond_ab_arp_probe(struct bonding *bond) 2767 { 2768 struct slave *slave, *before = NULL, *new_slave = NULL, 2769 *curr_arp_slave = rcu_dereference(bond->current_arp_slave), 2770 *curr_active_slave = rcu_dereference(bond->curr_active_slave); 2771 struct list_head *iter; 2772 bool found = false; 2773 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; 2774 2775 if (curr_arp_slave && curr_active_slave) 2776 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n", 2777 curr_arp_slave->dev->name, 2778 curr_active_slave->dev->name); 2779 2780 if (curr_active_slave) { 2781 bond_arp_send_all(bond, curr_active_slave); 2782 return should_notify_rtnl; 2783 } 2784 2785 /* if we don't have a curr_active_slave, search for the next available 2786 * backup slave from the current_arp_slave and make it the candidate 2787 * for becoming the curr_active_slave 2788 */ 2789 2790 if (!curr_arp_slave) { 2791 curr_arp_slave = bond_first_slave_rcu(bond); 2792 if (!curr_arp_slave) 2793 return should_notify_rtnl; 2794 } 2795 2796 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER); 2797 2798 bond_for_each_slave_rcu(bond, slave, iter) { 2799 if (!found && !before && bond_slave_is_up(slave)) 2800 before = slave; 2801 2802 if (found && !new_slave && bond_slave_is_up(slave)) 2803 new_slave = slave; 2804 /* if the link state is up at this point, we 2805 * mark it down - this can happen if we have 2806 * simultaneous link failures and 2807 * reselect_active_interface doesn't make this 2808 * one the current slave so it is still marked 2809 * up when it is actually down 2810 */ 2811 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 2812 bond_set_slave_link_state(slave, BOND_LINK_DOWN); 2813 if (slave->link_failure_count < UINT_MAX) 2814 slave->link_failure_count++; 2815 2816 bond_set_slave_inactive_flags(slave, 2817 BOND_SLAVE_NOTIFY_LATER); 2818 2819 netdev_info(bond->dev, "backup interface %s is now down\n", 2820 slave->dev->name); 2821 } 2822 if (slave == curr_arp_slave) 2823 found = true; 2824 } 2825 2826 if (!new_slave && before) 2827 new_slave = before; 2828 2829 if (!new_slave) 2830 goto check_state; 2831 2832 bond_set_slave_link_state(new_slave, BOND_LINK_BACK); 2833 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER); 2834 bond_arp_send_all(bond, new_slave); 2835 new_slave->last_link_up = jiffies; 2836 rcu_assign_pointer(bond->current_arp_slave, new_slave); 2837 2838 check_state: 2839 bond_for_each_slave_rcu(bond, slave, iter) { 2840 if (slave->should_notify) { 2841 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; 2842 break; 2843 } 2844 } 2845 return should_notify_rtnl; 2846 } 2847 2848 static void bond_activebackup_arp_mon(struct work_struct *work) 2849 { 2850 struct bonding *bond = container_of(work, struct bonding, 2851 arp_work.work); 2852 bool should_notify_peers = false; 2853 bool should_notify_rtnl = false; 2854 int delta_in_ticks; 2855 2856 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2857 2858 if (!bond_has_slaves(bond)) 2859 goto re_arm; 2860 2861 rcu_read_lock(); 2862 2863 should_notify_peers = bond_should_notify_peers(bond); 2864 2865 if (bond_ab_arp_inspect(bond)) { 2866 rcu_read_unlock(); 2867 2868 /* Race avoidance with bond_close flush of workqueue */ 2869 if (!rtnl_trylock()) { 2870 delta_in_ticks = 1; 2871 should_notify_peers = false; 2872 goto re_arm; 2873 } 2874 2875 bond_ab_arp_commit(bond); 2876 2877 rtnl_unlock(); 2878 rcu_read_lock(); 2879 } 2880 2881 should_notify_rtnl = bond_ab_arp_probe(bond); 2882 rcu_read_unlock(); 2883 2884 re_arm: 2885 if (bond->params.arp_interval) 2886 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 2887 2888 if (should_notify_peers || should_notify_rtnl) { 2889 if (!rtnl_trylock()) 2890 return; 2891 2892 if (should_notify_peers) 2893 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 2894 bond->dev); 2895 if (should_notify_rtnl) 2896 bond_slave_state_notify(bond); 2897 2898 rtnl_unlock(); 2899 } 2900 } 2901 2902 /*-------------------------- netdev event handling --------------------------*/ 2903 2904 /* Change device name */ 2905 static int bond_event_changename(struct bonding *bond) 2906 { 2907 bond_remove_proc_entry(bond); 2908 bond_create_proc_entry(bond); 2909 2910 bond_debug_reregister(bond); 2911 2912 return NOTIFY_DONE; 2913 } 2914 2915 static int bond_master_netdev_event(unsigned long event, 2916 struct net_device *bond_dev) 2917 { 2918 struct bonding *event_bond = netdev_priv(bond_dev); 2919 2920 switch (event) { 2921 case NETDEV_CHANGENAME: 2922 return bond_event_changename(event_bond); 2923 case NETDEV_UNREGISTER: 2924 bond_remove_proc_entry(event_bond); 2925 break; 2926 case NETDEV_REGISTER: 2927 bond_create_proc_entry(event_bond); 2928 break; 2929 case NETDEV_NOTIFY_PEERS: 2930 if (event_bond->send_peer_notif) 2931 event_bond->send_peer_notif--; 2932 break; 2933 default: 2934 break; 2935 } 2936 2937 return NOTIFY_DONE; 2938 } 2939 2940 static int bond_slave_netdev_event(unsigned long event, 2941 struct net_device *slave_dev) 2942 { 2943 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary; 2944 struct bonding *bond; 2945 struct net_device *bond_dev; 2946 u32 old_speed; 2947 u8 old_duplex; 2948 2949 /* A netdev event can be generated while enslaving a device 2950 * before netdev_rx_handler_register is called in which case 2951 * slave will be NULL 2952 */ 2953 if (!slave) 2954 return NOTIFY_DONE; 2955 bond_dev = slave->bond->dev; 2956 bond = slave->bond; 2957 primary = rtnl_dereference(bond->primary_slave); 2958 2959 switch (event) { 2960 case NETDEV_UNREGISTER: 2961 if (bond_dev->type != ARPHRD_ETHER) 2962 bond_release_and_destroy(bond_dev, slave_dev); 2963 else 2964 bond_release(bond_dev, slave_dev); 2965 break; 2966 case NETDEV_UP: 2967 case NETDEV_CHANGE: 2968 old_speed = slave->speed; 2969 old_duplex = slave->duplex; 2970 2971 bond_update_speed_duplex(slave); 2972 2973 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 2974 if (old_speed != slave->speed) 2975 bond_3ad_adapter_speed_changed(slave); 2976 if (old_duplex != slave->duplex) 2977 bond_3ad_adapter_duplex_changed(slave); 2978 } 2979 /* Fallthrough */ 2980 case NETDEV_DOWN: 2981 /* Refresh slave-array if applicable! 2982 * If the setup does not use miimon or arpmon (mode-specific!), 2983 * then these events will not cause the slave-array to be 2984 * refreshed. This will cause xmit to use a slave that is not 2985 * usable. Avoid such situation by refeshing the array at these 2986 * events. If these (miimon/arpmon) parameters are configured 2987 * then array gets refreshed twice and that should be fine! 2988 */ 2989 if (bond_mode_uses_xmit_hash(bond)) 2990 bond_update_slave_arr(bond, NULL); 2991 break; 2992 case NETDEV_CHANGEMTU: 2993 /* TODO: Should slaves be allowed to 2994 * independently alter their MTU? For 2995 * an active-backup bond, slaves need 2996 * not be the same type of device, so 2997 * MTUs may vary. For other modes, 2998 * slaves arguably should have the 2999 * same MTUs. To do this, we'd need to 3000 * take over the slave's change_mtu 3001 * function for the duration of their 3002 * servitude. 3003 */ 3004 break; 3005 case NETDEV_CHANGENAME: 3006 /* we don't care if we don't have primary set */ 3007 if (!bond_uses_primary(bond) || 3008 !bond->params.primary[0]) 3009 break; 3010 3011 if (slave == primary) { 3012 /* slave's name changed - he's no longer primary */ 3013 RCU_INIT_POINTER(bond->primary_slave, NULL); 3014 } else if (!strcmp(slave_dev->name, bond->params.primary)) { 3015 /* we have a new primary slave */ 3016 rcu_assign_pointer(bond->primary_slave, slave); 3017 } else { /* we didn't change primary - exit */ 3018 break; 3019 } 3020 3021 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n", 3022 primary ? slave_dev->name : "none"); 3023 3024 block_netpoll_tx(); 3025 bond_select_active_slave(bond); 3026 unblock_netpoll_tx(); 3027 break; 3028 case NETDEV_FEAT_CHANGE: 3029 bond_compute_features(bond); 3030 break; 3031 case NETDEV_RESEND_IGMP: 3032 /* Propagate to master device */ 3033 call_netdevice_notifiers(event, slave->bond->dev); 3034 break; 3035 default: 3036 break; 3037 } 3038 3039 return NOTIFY_DONE; 3040 } 3041 3042 /* bond_netdev_event: handle netdev notifier chain events. 3043 * 3044 * This function receives events for the netdev chain. The caller (an 3045 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 3046 * locks for us to safely manipulate the slave devices (RTNL lock, 3047 * dev_probe_lock). 3048 */ 3049 static int bond_netdev_event(struct notifier_block *this, 3050 unsigned long event, void *ptr) 3051 { 3052 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 3053 3054 netdev_dbg(event_dev, "event: %lx\n", event); 3055 3056 if (!(event_dev->priv_flags & IFF_BONDING)) 3057 return NOTIFY_DONE; 3058 3059 if (event_dev->flags & IFF_MASTER) { 3060 netdev_dbg(event_dev, "IFF_MASTER\n"); 3061 return bond_master_netdev_event(event, event_dev); 3062 } 3063 3064 if (event_dev->flags & IFF_SLAVE) { 3065 netdev_dbg(event_dev, "IFF_SLAVE\n"); 3066 return bond_slave_netdev_event(event, event_dev); 3067 } 3068 3069 return NOTIFY_DONE; 3070 } 3071 3072 static struct notifier_block bond_netdev_notifier = { 3073 .notifier_call = bond_netdev_event, 3074 }; 3075 3076 /*---------------------------- Hashing Policies -----------------------------*/ 3077 3078 /* L2 hash helper */ 3079 static inline u32 bond_eth_hash(struct sk_buff *skb) 3080 { 3081 struct ethhdr *ep, hdr_tmp; 3082 3083 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp); 3084 if (ep) 3085 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto; 3086 return 0; 3087 } 3088 3089 /* Extract the appropriate headers based on bond's xmit policy */ 3090 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, 3091 struct flow_keys *fk) 3092 { 3093 const struct ipv6hdr *iph6; 3094 const struct iphdr *iph; 3095 int noff, proto = -1; 3096 3097 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23) 3098 return skb_flow_dissect_flow_keys(skb, fk, 0); 3099 3100 fk->ports.ports = 0; 3101 noff = skb_network_offset(skb); 3102 if (skb->protocol == htons(ETH_P_IP)) { 3103 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph)))) 3104 return false; 3105 iph = ip_hdr(skb); 3106 iph_to_flow_copy_v4addrs(fk, iph); 3107 noff += iph->ihl << 2; 3108 if (!ip_is_fragment(iph)) 3109 proto = iph->protocol; 3110 } else if (skb->protocol == htons(ETH_P_IPV6)) { 3111 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6)))) 3112 return false; 3113 iph6 = ipv6_hdr(skb); 3114 iph_to_flow_copy_v6addrs(fk, iph6); 3115 noff += sizeof(*iph6); 3116 proto = iph6->nexthdr; 3117 } else { 3118 return false; 3119 } 3120 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0) 3121 fk->ports.ports = skb_flow_get_ports(skb, noff, proto); 3122 3123 return true; 3124 } 3125 3126 /** 3127 * bond_xmit_hash - generate a hash value based on the xmit policy 3128 * @bond: bonding device 3129 * @skb: buffer to use for headers 3130 * 3131 * This function will extract the necessary headers from the skb buffer and use 3132 * them to generate a hash based on the xmit_policy set in the bonding device 3133 */ 3134 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb) 3135 { 3136 struct flow_keys flow; 3137 u32 hash; 3138 3139 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 || 3140 !bond_flow_dissect(bond, skb, &flow)) 3141 return bond_eth_hash(skb); 3142 3143 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 || 3144 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) 3145 hash = bond_eth_hash(skb); 3146 else 3147 hash = (__force u32)flow.ports.ports; 3148 hash ^= (__force u32)flow_get_u32_dst(&flow) ^ 3149 (__force u32)flow_get_u32_src(&flow); 3150 hash ^= (hash >> 16); 3151 hash ^= (hash >> 8); 3152 3153 return hash; 3154 } 3155 3156 /*-------------------------- Device entry points ----------------------------*/ 3157 3158 static void bond_work_init_all(struct bonding *bond) 3159 { 3160 INIT_DELAYED_WORK(&bond->mcast_work, 3161 bond_resend_igmp_join_requests_delayed); 3162 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 3163 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 3164 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3165 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon); 3166 else 3167 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon); 3168 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 3169 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler); 3170 } 3171 3172 static void bond_work_cancel_all(struct bonding *bond) 3173 { 3174 cancel_delayed_work_sync(&bond->mii_work); 3175 cancel_delayed_work_sync(&bond->arp_work); 3176 cancel_delayed_work_sync(&bond->alb_work); 3177 cancel_delayed_work_sync(&bond->ad_work); 3178 cancel_delayed_work_sync(&bond->mcast_work); 3179 cancel_delayed_work_sync(&bond->slave_arr_work); 3180 } 3181 3182 static int bond_open(struct net_device *bond_dev) 3183 { 3184 struct bonding *bond = netdev_priv(bond_dev); 3185 struct list_head *iter; 3186 struct slave *slave; 3187 3188 /* reset slave->backup and slave->inactive */ 3189 if (bond_has_slaves(bond)) { 3190 bond_for_each_slave(bond, slave, iter) { 3191 if (bond_uses_primary(bond) && 3192 slave != rcu_access_pointer(bond->curr_active_slave)) { 3193 bond_set_slave_inactive_flags(slave, 3194 BOND_SLAVE_NOTIFY_NOW); 3195 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) { 3196 bond_set_slave_active_flags(slave, 3197 BOND_SLAVE_NOTIFY_NOW); 3198 } 3199 } 3200 } 3201 3202 bond_work_init_all(bond); 3203 3204 if (bond_is_lb(bond)) { 3205 /* bond_alb_initialize must be called before the timer 3206 * is started. 3207 */ 3208 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB))) 3209 return -ENOMEM; 3210 if (bond->params.tlb_dynamic_lb) 3211 queue_delayed_work(bond->wq, &bond->alb_work, 0); 3212 } 3213 3214 if (bond->params.miimon) /* link check interval, in milliseconds. */ 3215 queue_delayed_work(bond->wq, &bond->mii_work, 0); 3216 3217 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 3218 queue_delayed_work(bond->wq, &bond->arp_work, 0); 3219 bond->recv_probe = bond_arp_rcv; 3220 } 3221 3222 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3223 queue_delayed_work(bond->wq, &bond->ad_work, 0); 3224 /* register to receive LACPDUs */ 3225 bond->recv_probe = bond_3ad_lacpdu_recv; 3226 bond_3ad_initiate_agg_selection(bond, 1); 3227 } 3228 3229 if (bond_mode_uses_xmit_hash(bond)) 3230 bond_update_slave_arr(bond, NULL); 3231 3232 return 0; 3233 } 3234 3235 static int bond_close(struct net_device *bond_dev) 3236 { 3237 struct bonding *bond = netdev_priv(bond_dev); 3238 3239 bond_work_cancel_all(bond); 3240 bond->send_peer_notif = 0; 3241 if (bond_is_lb(bond)) 3242 bond_alb_deinitialize(bond); 3243 bond->recv_probe = NULL; 3244 3245 return 0; 3246 } 3247 3248 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev, 3249 struct rtnl_link_stats64 *stats) 3250 { 3251 struct bonding *bond = netdev_priv(bond_dev); 3252 struct rtnl_link_stats64 temp; 3253 struct list_head *iter; 3254 struct slave *slave; 3255 3256 memcpy(stats, &bond->bond_stats, sizeof(*stats)); 3257 3258 bond_for_each_slave(bond, slave, iter) { 3259 const struct rtnl_link_stats64 *sstats = 3260 dev_get_stats(slave->dev, &temp); 3261 struct rtnl_link_stats64 *pstats = &slave->slave_stats; 3262 3263 stats->rx_packets += sstats->rx_packets - pstats->rx_packets; 3264 stats->rx_bytes += sstats->rx_bytes - pstats->rx_bytes; 3265 stats->rx_errors += sstats->rx_errors - pstats->rx_errors; 3266 stats->rx_dropped += sstats->rx_dropped - pstats->rx_dropped; 3267 3268 stats->tx_packets += sstats->tx_packets - pstats->tx_packets;; 3269 stats->tx_bytes += sstats->tx_bytes - pstats->tx_bytes; 3270 stats->tx_errors += sstats->tx_errors - pstats->tx_errors; 3271 stats->tx_dropped += sstats->tx_dropped - pstats->tx_dropped; 3272 3273 stats->multicast += sstats->multicast - pstats->multicast; 3274 stats->collisions += sstats->collisions - pstats->collisions; 3275 3276 stats->rx_length_errors += sstats->rx_length_errors - pstats->rx_length_errors; 3277 stats->rx_over_errors += sstats->rx_over_errors - pstats->rx_over_errors; 3278 stats->rx_crc_errors += sstats->rx_crc_errors - pstats->rx_crc_errors; 3279 stats->rx_frame_errors += sstats->rx_frame_errors - pstats->rx_frame_errors; 3280 stats->rx_fifo_errors += sstats->rx_fifo_errors - pstats->rx_fifo_errors; 3281 stats->rx_missed_errors += sstats->rx_missed_errors - pstats->rx_missed_errors; 3282 3283 stats->tx_aborted_errors += sstats->tx_aborted_errors - pstats->tx_aborted_errors; 3284 stats->tx_carrier_errors += sstats->tx_carrier_errors - pstats->tx_carrier_errors; 3285 stats->tx_fifo_errors += sstats->tx_fifo_errors - pstats->tx_fifo_errors; 3286 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors - pstats->tx_heartbeat_errors; 3287 stats->tx_window_errors += sstats->tx_window_errors - pstats->tx_window_errors; 3288 3289 /* save off the slave stats for the next run */ 3290 memcpy(pstats, sstats, sizeof(*sstats)); 3291 } 3292 memcpy(&bond->bond_stats, stats, sizeof(*stats)); 3293 3294 return stats; 3295 } 3296 3297 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 3298 { 3299 struct bonding *bond = netdev_priv(bond_dev); 3300 struct net_device *slave_dev = NULL; 3301 struct ifbond k_binfo; 3302 struct ifbond __user *u_binfo = NULL; 3303 struct ifslave k_sinfo; 3304 struct ifslave __user *u_sinfo = NULL; 3305 struct mii_ioctl_data *mii = NULL; 3306 struct bond_opt_value newval; 3307 struct net *net; 3308 int res = 0; 3309 3310 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd); 3311 3312 switch (cmd) { 3313 case SIOCGMIIPHY: 3314 mii = if_mii(ifr); 3315 if (!mii) 3316 return -EINVAL; 3317 3318 mii->phy_id = 0; 3319 /* Fall Through */ 3320 case SIOCGMIIREG: 3321 /* We do this again just in case we were called by SIOCGMIIREG 3322 * instead of SIOCGMIIPHY. 3323 */ 3324 mii = if_mii(ifr); 3325 if (!mii) 3326 return -EINVAL; 3327 3328 if (mii->reg_num == 1) { 3329 mii->val_out = 0; 3330 if (netif_carrier_ok(bond->dev)) 3331 mii->val_out = BMSR_LSTATUS; 3332 } 3333 3334 return 0; 3335 case BOND_INFO_QUERY_OLD: 3336 case SIOCBONDINFOQUERY: 3337 u_binfo = (struct ifbond __user *)ifr->ifr_data; 3338 3339 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 3340 return -EFAULT; 3341 3342 res = bond_info_query(bond_dev, &k_binfo); 3343 if (res == 0 && 3344 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 3345 return -EFAULT; 3346 3347 return res; 3348 case BOND_SLAVE_INFO_QUERY_OLD: 3349 case SIOCBONDSLAVEINFOQUERY: 3350 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 3351 3352 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 3353 return -EFAULT; 3354 3355 res = bond_slave_info_query(bond_dev, &k_sinfo); 3356 if (res == 0 && 3357 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 3358 return -EFAULT; 3359 3360 return res; 3361 default: 3362 break; 3363 } 3364 3365 net = dev_net(bond_dev); 3366 3367 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3368 return -EPERM; 3369 3370 slave_dev = __dev_get_by_name(net, ifr->ifr_slave); 3371 3372 netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev); 3373 3374 if (!slave_dev) 3375 return -ENODEV; 3376 3377 netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name); 3378 switch (cmd) { 3379 case BOND_ENSLAVE_OLD: 3380 case SIOCBONDENSLAVE: 3381 res = bond_enslave(bond_dev, slave_dev); 3382 break; 3383 case BOND_RELEASE_OLD: 3384 case SIOCBONDRELEASE: 3385 res = bond_release(bond_dev, slave_dev); 3386 break; 3387 case BOND_SETHWADDR_OLD: 3388 case SIOCBONDSETHWADDR: 3389 bond_set_dev_addr(bond_dev, slave_dev); 3390 res = 0; 3391 break; 3392 case BOND_CHANGE_ACTIVE_OLD: 3393 case SIOCBONDCHANGEACTIVE: 3394 bond_opt_initstr(&newval, slave_dev->name); 3395 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval); 3396 break; 3397 default: 3398 res = -EOPNOTSUPP; 3399 } 3400 3401 return res; 3402 } 3403 3404 static void bond_change_rx_flags(struct net_device *bond_dev, int change) 3405 { 3406 struct bonding *bond = netdev_priv(bond_dev); 3407 3408 if (change & IFF_PROMISC) 3409 bond_set_promiscuity(bond, 3410 bond_dev->flags & IFF_PROMISC ? 1 : -1); 3411 3412 if (change & IFF_ALLMULTI) 3413 bond_set_allmulti(bond, 3414 bond_dev->flags & IFF_ALLMULTI ? 1 : -1); 3415 } 3416 3417 static void bond_set_rx_mode(struct net_device *bond_dev) 3418 { 3419 struct bonding *bond = netdev_priv(bond_dev); 3420 struct list_head *iter; 3421 struct slave *slave; 3422 3423 rcu_read_lock(); 3424 if (bond_uses_primary(bond)) { 3425 slave = rcu_dereference(bond->curr_active_slave); 3426 if (slave) { 3427 dev_uc_sync(slave->dev, bond_dev); 3428 dev_mc_sync(slave->dev, bond_dev); 3429 } 3430 } else { 3431 bond_for_each_slave_rcu(bond, slave, iter) { 3432 dev_uc_sync_multiple(slave->dev, bond_dev); 3433 dev_mc_sync_multiple(slave->dev, bond_dev); 3434 } 3435 } 3436 rcu_read_unlock(); 3437 } 3438 3439 static int bond_neigh_init(struct neighbour *n) 3440 { 3441 struct bonding *bond = netdev_priv(n->dev); 3442 const struct net_device_ops *slave_ops; 3443 struct neigh_parms parms; 3444 struct slave *slave; 3445 int ret; 3446 3447 slave = bond_first_slave(bond); 3448 if (!slave) 3449 return 0; 3450 slave_ops = slave->dev->netdev_ops; 3451 if (!slave_ops->ndo_neigh_setup) 3452 return 0; 3453 3454 parms.neigh_setup = NULL; 3455 parms.neigh_cleanup = NULL; 3456 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); 3457 if (ret) 3458 return ret; 3459 3460 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called 3461 * after the last slave has been detached. Assumes that all slaves 3462 * utilize the same neigh_cleanup (true at this writing as only user 3463 * is ipoib). 3464 */ 3465 n->parms->neigh_cleanup = parms.neigh_cleanup; 3466 3467 if (!parms.neigh_setup) 3468 return 0; 3469 3470 return parms.neigh_setup(n); 3471 } 3472 3473 /* The bonding ndo_neigh_setup is called at init time beofre any 3474 * slave exists. So we must declare proxy setup function which will 3475 * be used at run time to resolve the actual slave neigh param setup. 3476 * 3477 * It's also called by master devices (such as vlans) to setup their 3478 * underlying devices. In that case - do nothing, we're already set up from 3479 * our init. 3480 */ 3481 static int bond_neigh_setup(struct net_device *dev, 3482 struct neigh_parms *parms) 3483 { 3484 /* modify only our neigh_parms */ 3485 if (parms->dev == dev) 3486 parms->neigh_setup = bond_neigh_init; 3487 3488 return 0; 3489 } 3490 3491 /* Change the MTU of all of a master's slaves to match the master */ 3492 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 3493 { 3494 struct bonding *bond = netdev_priv(bond_dev); 3495 struct slave *slave, *rollback_slave; 3496 struct list_head *iter; 3497 int res = 0; 3498 3499 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu); 3500 3501 bond_for_each_slave(bond, slave, iter) { 3502 netdev_dbg(bond_dev, "s %p c_m %p\n", 3503 slave, slave->dev->netdev_ops->ndo_change_mtu); 3504 3505 res = dev_set_mtu(slave->dev, new_mtu); 3506 3507 if (res) { 3508 /* If we failed to set the slave's mtu to the new value 3509 * we must abort the operation even in ACTIVE_BACKUP 3510 * mode, because if we allow the backup slaves to have 3511 * different mtu values than the active slave we'll 3512 * need to change their mtu when doing a failover. That 3513 * means changing their mtu from timer context, which 3514 * is probably not a good idea. 3515 */ 3516 netdev_dbg(bond_dev, "err %d %s\n", res, 3517 slave->dev->name); 3518 goto unwind; 3519 } 3520 } 3521 3522 bond_dev->mtu = new_mtu; 3523 3524 return 0; 3525 3526 unwind: 3527 /* unwind from head to the slave that failed */ 3528 bond_for_each_slave(bond, rollback_slave, iter) { 3529 int tmp_res; 3530 3531 if (rollback_slave == slave) 3532 break; 3533 3534 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu); 3535 if (tmp_res) { 3536 netdev_dbg(bond_dev, "unwind err %d dev %s\n", 3537 tmp_res, rollback_slave->dev->name); 3538 } 3539 } 3540 3541 return res; 3542 } 3543 3544 /* Change HW address 3545 * 3546 * Note that many devices must be down to change the HW address, and 3547 * downing the master releases all slaves. We can make bonds full of 3548 * bonding devices to test this, however. 3549 */ 3550 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 3551 { 3552 struct bonding *bond = netdev_priv(bond_dev); 3553 struct slave *slave, *rollback_slave; 3554 struct sockaddr *sa = addr, tmp_sa; 3555 struct list_head *iter; 3556 int res = 0; 3557 3558 if (BOND_MODE(bond) == BOND_MODE_ALB) 3559 return bond_alb_set_mac_address(bond_dev, addr); 3560 3561 3562 netdev_dbg(bond_dev, "bond=%p\n", bond); 3563 3564 /* If fail_over_mac is enabled, do nothing and return success. 3565 * Returning an error causes ifenslave to fail. 3566 */ 3567 if (bond->params.fail_over_mac && 3568 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3569 return 0; 3570 3571 if (!is_valid_ether_addr(sa->sa_data)) 3572 return -EADDRNOTAVAIL; 3573 3574 bond_for_each_slave(bond, slave, iter) { 3575 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name); 3576 res = dev_set_mac_address(slave->dev, addr); 3577 if (res) { 3578 /* TODO: consider downing the slave 3579 * and retry ? 3580 * User should expect communications 3581 * breakage anyway until ARP finish 3582 * updating, so... 3583 */ 3584 netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name); 3585 goto unwind; 3586 } 3587 } 3588 3589 /* success */ 3590 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); 3591 return 0; 3592 3593 unwind: 3594 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 3595 tmp_sa.sa_family = bond_dev->type; 3596 3597 /* unwind from head to the slave that failed */ 3598 bond_for_each_slave(bond, rollback_slave, iter) { 3599 int tmp_res; 3600 3601 if (rollback_slave == slave) 3602 break; 3603 3604 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa); 3605 if (tmp_res) { 3606 netdev_dbg(bond_dev, "unwind err %d dev %s\n", 3607 tmp_res, rollback_slave->dev->name); 3608 } 3609 } 3610 3611 return res; 3612 } 3613 3614 /** 3615 * bond_xmit_slave_id - transmit skb through slave with slave_id 3616 * @bond: bonding device that is transmitting 3617 * @skb: buffer to transmit 3618 * @slave_id: slave id up to slave_cnt-1 through which to transmit 3619 * 3620 * This function tries to transmit through slave with slave_id but in case 3621 * it fails, it tries to find the first available slave for transmission. 3622 * The skb is consumed in all cases, thus the function is void. 3623 */ 3624 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id) 3625 { 3626 struct list_head *iter; 3627 struct slave *slave; 3628 int i = slave_id; 3629 3630 /* Here we start from the slave with slave_id */ 3631 bond_for_each_slave_rcu(bond, slave, iter) { 3632 if (--i < 0) { 3633 if (bond_slave_can_tx(slave)) { 3634 bond_dev_queue_xmit(bond, skb, slave->dev); 3635 return; 3636 } 3637 } 3638 } 3639 3640 /* Here we start from the first slave up to slave_id */ 3641 i = slave_id; 3642 bond_for_each_slave_rcu(bond, slave, iter) { 3643 if (--i < 0) 3644 break; 3645 if (bond_slave_can_tx(slave)) { 3646 bond_dev_queue_xmit(bond, skb, slave->dev); 3647 return; 3648 } 3649 } 3650 /* no slave that can tx has been found */ 3651 bond_tx_drop(bond->dev, skb); 3652 } 3653 3654 /** 3655 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave 3656 * @bond: bonding device to use 3657 * 3658 * Based on the value of the bonding device's packets_per_slave parameter 3659 * this function generates a slave id, which is usually used as the next 3660 * slave to transmit through. 3661 */ 3662 static u32 bond_rr_gen_slave_id(struct bonding *bond) 3663 { 3664 u32 slave_id; 3665 struct reciprocal_value reciprocal_packets_per_slave; 3666 int packets_per_slave = bond->params.packets_per_slave; 3667 3668 switch (packets_per_slave) { 3669 case 0: 3670 slave_id = prandom_u32(); 3671 break; 3672 case 1: 3673 slave_id = bond->rr_tx_counter; 3674 break; 3675 default: 3676 reciprocal_packets_per_slave = 3677 bond->params.reciprocal_packets_per_slave; 3678 slave_id = reciprocal_divide(bond->rr_tx_counter, 3679 reciprocal_packets_per_slave); 3680 break; 3681 } 3682 bond->rr_tx_counter++; 3683 3684 return slave_id; 3685 } 3686 3687 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev) 3688 { 3689 struct bonding *bond = netdev_priv(bond_dev); 3690 struct iphdr *iph = ip_hdr(skb); 3691 struct slave *slave; 3692 u32 slave_id; 3693 3694 /* Start with the curr_active_slave that joined the bond as the 3695 * default for sending IGMP traffic. For failover purposes one 3696 * needs to maintain some consistency for the interface that will 3697 * send the join/membership reports. The curr_active_slave found 3698 * will send all of this type of traffic. 3699 */ 3700 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) { 3701 slave = rcu_dereference(bond->curr_active_slave); 3702 if (slave) 3703 bond_dev_queue_xmit(bond, skb, slave->dev); 3704 else 3705 bond_xmit_slave_id(bond, skb, 0); 3706 } else { 3707 int slave_cnt = ACCESS_ONCE(bond->slave_cnt); 3708 3709 if (likely(slave_cnt)) { 3710 slave_id = bond_rr_gen_slave_id(bond); 3711 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt); 3712 } else { 3713 bond_tx_drop(bond_dev, skb); 3714 } 3715 } 3716 3717 return NETDEV_TX_OK; 3718 } 3719 3720 /* In active-backup mode, we know that bond->curr_active_slave is always valid if 3721 * the bond has a usable interface. 3722 */ 3723 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev) 3724 { 3725 struct bonding *bond = netdev_priv(bond_dev); 3726 struct slave *slave; 3727 3728 slave = rcu_dereference(bond->curr_active_slave); 3729 if (slave) 3730 bond_dev_queue_xmit(bond, skb, slave->dev); 3731 else 3732 bond_tx_drop(bond_dev, skb); 3733 3734 return NETDEV_TX_OK; 3735 } 3736 3737 /* Use this to update slave_array when (a) it's not appropriate to update 3738 * slave_array right away (note that update_slave_array() may sleep) 3739 * and / or (b) RTNL is not held. 3740 */ 3741 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay) 3742 { 3743 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay); 3744 } 3745 3746 /* Slave array work handler. Holds only RTNL */ 3747 static void bond_slave_arr_handler(struct work_struct *work) 3748 { 3749 struct bonding *bond = container_of(work, struct bonding, 3750 slave_arr_work.work); 3751 int ret; 3752 3753 if (!rtnl_trylock()) 3754 goto err; 3755 3756 ret = bond_update_slave_arr(bond, NULL); 3757 rtnl_unlock(); 3758 if (ret) { 3759 pr_warn_ratelimited("Failed to update slave array from WT\n"); 3760 goto err; 3761 } 3762 return; 3763 3764 err: 3765 bond_slave_arr_work_rearm(bond, 1); 3766 } 3767 3768 /* Build the usable slaves array in control path for modes that use xmit-hash 3769 * to determine the slave interface - 3770 * (a) BOND_MODE_8023AD 3771 * (b) BOND_MODE_XOR 3772 * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0 3773 * 3774 * The caller is expected to hold RTNL only and NO other lock! 3775 */ 3776 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave) 3777 { 3778 struct slave *slave; 3779 struct list_head *iter; 3780 struct bond_up_slave *new_arr, *old_arr; 3781 int agg_id = 0; 3782 int ret = 0; 3783 3784 #ifdef CONFIG_LOCKDEP 3785 WARN_ON(lockdep_is_held(&bond->mode_lock)); 3786 #endif 3787 3788 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]), 3789 GFP_KERNEL); 3790 if (!new_arr) { 3791 ret = -ENOMEM; 3792 pr_err("Failed to build slave-array.\n"); 3793 goto out; 3794 } 3795 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3796 struct ad_info ad_info; 3797 3798 if (bond_3ad_get_active_agg_info(bond, &ad_info)) { 3799 pr_debug("bond_3ad_get_active_agg_info failed\n"); 3800 kfree_rcu(new_arr, rcu); 3801 /* No active aggragator means it's not safe to use 3802 * the previous array. 3803 */ 3804 old_arr = rtnl_dereference(bond->slave_arr); 3805 if (old_arr) { 3806 RCU_INIT_POINTER(bond->slave_arr, NULL); 3807 kfree_rcu(old_arr, rcu); 3808 } 3809 goto out; 3810 } 3811 agg_id = ad_info.aggregator_id; 3812 } 3813 bond_for_each_slave(bond, slave, iter) { 3814 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 3815 struct aggregator *agg; 3816 3817 agg = SLAVE_AD_INFO(slave)->port.aggregator; 3818 if (!agg || agg->aggregator_identifier != agg_id) 3819 continue; 3820 } 3821 if (!bond_slave_can_tx(slave)) 3822 continue; 3823 if (skipslave == slave) 3824 continue; 3825 new_arr->arr[new_arr->count++] = slave; 3826 } 3827 3828 old_arr = rtnl_dereference(bond->slave_arr); 3829 rcu_assign_pointer(bond->slave_arr, new_arr); 3830 if (old_arr) 3831 kfree_rcu(old_arr, rcu); 3832 out: 3833 if (ret != 0 && skipslave) { 3834 int idx; 3835 3836 /* Rare situation where caller has asked to skip a specific 3837 * slave but allocation failed (most likely!). BTW this is 3838 * only possible when the call is initiated from 3839 * __bond_release_one(). In this situation; overwrite the 3840 * skipslave entry in the array with the last entry from the 3841 * array to avoid a situation where the xmit path may choose 3842 * this to-be-skipped slave to send a packet out. 3843 */ 3844 old_arr = rtnl_dereference(bond->slave_arr); 3845 for (idx = 0; idx < old_arr->count; idx++) { 3846 if (skipslave == old_arr->arr[idx]) { 3847 old_arr->arr[idx] = 3848 old_arr->arr[old_arr->count-1]; 3849 old_arr->count--; 3850 break; 3851 } 3852 } 3853 } 3854 return ret; 3855 } 3856 3857 /* Use this Xmit function for 3AD as well as XOR modes. The current 3858 * usable slave array is formed in the control path. The xmit function 3859 * just calculates hash and sends the packet out. 3860 */ 3861 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev) 3862 { 3863 struct bonding *bond = netdev_priv(dev); 3864 struct slave *slave; 3865 struct bond_up_slave *slaves; 3866 unsigned int count; 3867 3868 slaves = rcu_dereference(bond->slave_arr); 3869 count = slaves ? ACCESS_ONCE(slaves->count) : 0; 3870 if (likely(count)) { 3871 slave = slaves->arr[bond_xmit_hash(bond, skb) % count]; 3872 bond_dev_queue_xmit(bond, skb, slave->dev); 3873 } else { 3874 bond_tx_drop(dev, skb); 3875 } 3876 3877 return NETDEV_TX_OK; 3878 } 3879 3880 /* in broadcast mode, we send everything to all usable interfaces. */ 3881 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev) 3882 { 3883 struct bonding *bond = netdev_priv(bond_dev); 3884 struct slave *slave = NULL; 3885 struct list_head *iter; 3886 3887 bond_for_each_slave_rcu(bond, slave, iter) { 3888 if (bond_is_last_slave(bond, slave)) 3889 break; 3890 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 3891 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 3892 3893 if (!skb2) { 3894 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n", 3895 bond_dev->name, __func__); 3896 continue; 3897 } 3898 bond_dev_queue_xmit(bond, skb2, slave->dev); 3899 } 3900 } 3901 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) 3902 bond_dev_queue_xmit(bond, skb, slave->dev); 3903 else 3904 bond_tx_drop(bond_dev, skb); 3905 3906 return NETDEV_TX_OK; 3907 } 3908 3909 /*------------------------- Device initialization ---------------------------*/ 3910 3911 /* Lookup the slave that corresponds to a qid */ 3912 static inline int bond_slave_override(struct bonding *bond, 3913 struct sk_buff *skb) 3914 { 3915 struct slave *slave = NULL; 3916 struct list_head *iter; 3917 3918 if (!skb->queue_mapping) 3919 return 1; 3920 3921 /* Find out if any slaves have the same mapping as this skb. */ 3922 bond_for_each_slave_rcu(bond, slave, iter) { 3923 if (slave->queue_id == skb->queue_mapping) { 3924 if (bond_slave_is_up(slave) && 3925 slave->link == BOND_LINK_UP) { 3926 bond_dev_queue_xmit(bond, skb, slave->dev); 3927 return 0; 3928 } 3929 /* If the slave isn't UP, use default transmit policy. */ 3930 break; 3931 } 3932 } 3933 3934 return 1; 3935 } 3936 3937 3938 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb, 3939 void *accel_priv, select_queue_fallback_t fallback) 3940 { 3941 /* This helper function exists to help dev_pick_tx get the correct 3942 * destination queue. Using a helper function skips a call to 3943 * skb_tx_hash and will put the skbs in the queue we expect on their 3944 * way down to the bonding driver. 3945 */ 3946 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 3947 3948 /* Save the original txq to restore before passing to the driver */ 3949 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping; 3950 3951 if (unlikely(txq >= dev->real_num_tx_queues)) { 3952 do { 3953 txq -= dev->real_num_tx_queues; 3954 } while (txq >= dev->real_num_tx_queues); 3955 } 3956 return txq; 3957 } 3958 3959 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 3960 { 3961 struct bonding *bond = netdev_priv(dev); 3962 3963 if (bond_should_override_tx_queue(bond) && 3964 !bond_slave_override(bond, skb)) 3965 return NETDEV_TX_OK; 3966 3967 switch (BOND_MODE(bond)) { 3968 case BOND_MODE_ROUNDROBIN: 3969 return bond_xmit_roundrobin(skb, dev); 3970 case BOND_MODE_ACTIVEBACKUP: 3971 return bond_xmit_activebackup(skb, dev); 3972 case BOND_MODE_8023AD: 3973 case BOND_MODE_XOR: 3974 return bond_3ad_xor_xmit(skb, dev); 3975 case BOND_MODE_BROADCAST: 3976 return bond_xmit_broadcast(skb, dev); 3977 case BOND_MODE_ALB: 3978 return bond_alb_xmit(skb, dev); 3979 case BOND_MODE_TLB: 3980 return bond_tlb_xmit(skb, dev); 3981 default: 3982 /* Should never happen, mode already checked */ 3983 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond)); 3984 WARN_ON_ONCE(1); 3985 bond_tx_drop(dev, skb); 3986 return NETDEV_TX_OK; 3987 } 3988 } 3989 3990 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 3991 { 3992 struct bonding *bond = netdev_priv(dev); 3993 netdev_tx_t ret = NETDEV_TX_OK; 3994 3995 /* If we risk deadlock from transmitting this in the 3996 * netpoll path, tell netpoll to queue the frame for later tx 3997 */ 3998 if (unlikely(is_netpoll_tx_blocked(dev))) 3999 return NETDEV_TX_BUSY; 4000 4001 rcu_read_lock(); 4002 if (bond_has_slaves(bond)) 4003 ret = __bond_start_xmit(skb, dev); 4004 else 4005 bond_tx_drop(dev, skb); 4006 rcu_read_unlock(); 4007 4008 return ret; 4009 } 4010 4011 static int bond_ethtool_get_settings(struct net_device *bond_dev, 4012 struct ethtool_cmd *ecmd) 4013 { 4014 struct bonding *bond = netdev_priv(bond_dev); 4015 unsigned long speed = 0; 4016 struct list_head *iter; 4017 struct slave *slave; 4018 4019 ecmd->duplex = DUPLEX_UNKNOWN; 4020 ecmd->port = PORT_OTHER; 4021 4022 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we 4023 * do not need to check mode. Though link speed might not represent 4024 * the true receive or transmit bandwidth (not all modes are symmetric) 4025 * this is an accurate maximum. 4026 */ 4027 bond_for_each_slave(bond, slave, iter) { 4028 if (bond_slave_can_tx(slave)) { 4029 if (slave->speed != SPEED_UNKNOWN) 4030 speed += slave->speed; 4031 if (ecmd->duplex == DUPLEX_UNKNOWN && 4032 slave->duplex != DUPLEX_UNKNOWN) 4033 ecmd->duplex = slave->duplex; 4034 } 4035 } 4036 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN); 4037 4038 return 0; 4039 } 4040 4041 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 4042 struct ethtool_drvinfo *drvinfo) 4043 { 4044 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver)); 4045 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version)); 4046 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d", 4047 BOND_ABI_VERSION); 4048 } 4049 4050 static const struct ethtool_ops bond_ethtool_ops = { 4051 .get_drvinfo = bond_ethtool_get_drvinfo, 4052 .get_settings = bond_ethtool_get_settings, 4053 .get_link = ethtool_op_get_link, 4054 }; 4055 4056 static const struct net_device_ops bond_netdev_ops = { 4057 .ndo_init = bond_init, 4058 .ndo_uninit = bond_uninit, 4059 .ndo_open = bond_open, 4060 .ndo_stop = bond_close, 4061 .ndo_start_xmit = bond_start_xmit, 4062 .ndo_select_queue = bond_select_queue, 4063 .ndo_get_stats64 = bond_get_stats, 4064 .ndo_do_ioctl = bond_do_ioctl, 4065 .ndo_change_rx_flags = bond_change_rx_flags, 4066 .ndo_set_rx_mode = bond_set_rx_mode, 4067 .ndo_change_mtu = bond_change_mtu, 4068 .ndo_set_mac_address = bond_set_mac_address, 4069 .ndo_neigh_setup = bond_neigh_setup, 4070 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 4071 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 4072 #ifdef CONFIG_NET_POLL_CONTROLLER 4073 .ndo_netpoll_setup = bond_netpoll_setup, 4074 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 4075 .ndo_poll_controller = bond_poll_controller, 4076 #endif 4077 .ndo_add_slave = bond_enslave, 4078 .ndo_del_slave = bond_release, 4079 .ndo_fix_features = bond_fix_features, 4080 .ndo_bridge_setlink = switchdev_port_bridge_setlink, 4081 .ndo_bridge_getlink = switchdev_port_bridge_getlink, 4082 .ndo_bridge_dellink = switchdev_port_bridge_dellink, 4083 .ndo_fdb_add = switchdev_port_fdb_add, 4084 .ndo_fdb_del = switchdev_port_fdb_del, 4085 .ndo_fdb_dump = switchdev_port_fdb_dump, 4086 .ndo_features_check = passthru_features_check, 4087 }; 4088 4089 static const struct device_type bond_type = { 4090 .name = "bond", 4091 }; 4092 4093 static void bond_destructor(struct net_device *bond_dev) 4094 { 4095 struct bonding *bond = netdev_priv(bond_dev); 4096 if (bond->wq) 4097 destroy_workqueue(bond->wq); 4098 free_netdev(bond_dev); 4099 } 4100 4101 void bond_setup(struct net_device *bond_dev) 4102 { 4103 struct bonding *bond = netdev_priv(bond_dev); 4104 4105 spin_lock_init(&bond->mode_lock); 4106 bond->params = bonding_defaults; 4107 4108 /* Initialize pointers */ 4109 bond->dev = bond_dev; 4110 4111 /* Initialize the device entry points */ 4112 ether_setup(bond_dev); 4113 bond_dev->netdev_ops = &bond_netdev_ops; 4114 bond_dev->ethtool_ops = &bond_ethtool_ops; 4115 4116 bond_dev->destructor = bond_destructor; 4117 4118 SET_NETDEV_DEVTYPE(bond_dev, &bond_type); 4119 4120 /* Initialize the device options */ 4121 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST; 4122 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE; 4123 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 4124 4125 /* don't acquire bond device's netif_tx_lock when transmitting */ 4126 bond_dev->features |= NETIF_F_LLTX; 4127 4128 /* By default, we declare the bond to be fully 4129 * VLAN hardware accelerated capable. Special 4130 * care is taken in the various xmit functions 4131 * when there are slaves that are not hw accel 4132 * capable 4133 */ 4134 4135 /* Don't allow bond devices to change network namespaces. */ 4136 bond_dev->features |= NETIF_F_NETNS_LOCAL; 4137 4138 bond_dev->hw_features = BOND_VLAN_FEATURES | 4139 NETIF_F_HW_VLAN_CTAG_TX | 4140 NETIF_F_HW_VLAN_CTAG_RX | 4141 NETIF_F_HW_VLAN_CTAG_FILTER; 4142 4143 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM); 4144 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL; 4145 bond_dev->features |= bond_dev->hw_features; 4146 } 4147 4148 /* Destroy a bonding device. 4149 * Must be under rtnl_lock when this function is called. 4150 */ 4151 static void bond_uninit(struct net_device *bond_dev) 4152 { 4153 struct bonding *bond = netdev_priv(bond_dev); 4154 struct list_head *iter; 4155 struct slave *slave; 4156 struct bond_up_slave *arr; 4157 4158 bond_netpoll_cleanup(bond_dev); 4159 4160 /* Release the bonded slaves */ 4161 bond_for_each_slave(bond, slave, iter) 4162 __bond_release_one(bond_dev, slave->dev, true); 4163 netdev_info(bond_dev, "Released all slaves\n"); 4164 4165 arr = rtnl_dereference(bond->slave_arr); 4166 if (arr) { 4167 RCU_INIT_POINTER(bond->slave_arr, NULL); 4168 kfree_rcu(arr, rcu); 4169 } 4170 4171 list_del(&bond->bond_list); 4172 4173 bond_debug_unregister(bond); 4174 } 4175 4176 /*------------------------- Module initialization ---------------------------*/ 4177 4178 static int bond_check_params(struct bond_params *params) 4179 { 4180 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i; 4181 struct bond_opt_value newval; 4182 const struct bond_opt_value *valptr; 4183 int arp_all_targets_value; 4184 u16 ad_actor_sys_prio = 0; 4185 u16 ad_user_port_key = 0; 4186 4187 /* Convert string parameters. */ 4188 if (mode) { 4189 bond_opt_initstr(&newval, mode); 4190 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval); 4191 if (!valptr) { 4192 pr_err("Error: Invalid bonding mode \"%s\"\n", mode); 4193 return -EINVAL; 4194 } 4195 bond_mode = valptr->value; 4196 } 4197 4198 if (xmit_hash_policy) { 4199 if ((bond_mode != BOND_MODE_XOR) && 4200 (bond_mode != BOND_MODE_8023AD) && 4201 (bond_mode != BOND_MODE_TLB)) { 4202 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 4203 bond_mode_name(bond_mode)); 4204 } else { 4205 bond_opt_initstr(&newval, xmit_hash_policy); 4206 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH), 4207 &newval); 4208 if (!valptr) { 4209 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 4210 xmit_hash_policy); 4211 return -EINVAL; 4212 } 4213 xmit_hashtype = valptr->value; 4214 } 4215 } 4216 4217 if (lacp_rate) { 4218 if (bond_mode != BOND_MODE_8023AD) { 4219 pr_info("lacp_rate param is irrelevant in mode %s\n", 4220 bond_mode_name(bond_mode)); 4221 } else { 4222 bond_opt_initstr(&newval, lacp_rate); 4223 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE), 4224 &newval); 4225 if (!valptr) { 4226 pr_err("Error: Invalid lacp rate \"%s\"\n", 4227 lacp_rate); 4228 return -EINVAL; 4229 } 4230 lacp_fast = valptr->value; 4231 } 4232 } 4233 4234 if (ad_select) { 4235 bond_opt_initstr(&newval, ad_select); 4236 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT), 4237 &newval); 4238 if (!valptr) { 4239 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select); 4240 return -EINVAL; 4241 } 4242 params->ad_select = valptr->value; 4243 if (bond_mode != BOND_MODE_8023AD) 4244 pr_warn("ad_select param only affects 802.3ad mode\n"); 4245 } else { 4246 params->ad_select = BOND_AD_STABLE; 4247 } 4248 4249 if (max_bonds < 0) { 4250 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 4251 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 4252 max_bonds = BOND_DEFAULT_MAX_BONDS; 4253 } 4254 4255 if (miimon < 0) { 4256 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4257 miimon, INT_MAX); 4258 miimon = 0; 4259 } 4260 4261 if (updelay < 0) { 4262 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4263 updelay, INT_MAX); 4264 updelay = 0; 4265 } 4266 4267 if (downdelay < 0) { 4268 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4269 downdelay, INT_MAX); 4270 downdelay = 0; 4271 } 4272 4273 if ((use_carrier != 0) && (use_carrier != 1)) { 4274 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 4275 use_carrier); 4276 use_carrier = 1; 4277 } 4278 4279 if (num_peer_notif < 0 || num_peer_notif > 255) { 4280 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 4281 num_peer_notif); 4282 num_peer_notif = 1; 4283 } 4284 4285 /* reset values for 802.3ad/TLB/ALB */ 4286 if (!bond_mode_uses_arp(bond_mode)) { 4287 if (!miimon) { 4288 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"); 4289 pr_warn("Forcing miimon to 100msec\n"); 4290 miimon = BOND_DEFAULT_MIIMON; 4291 } 4292 } 4293 4294 if (tx_queues < 1 || tx_queues > 255) { 4295 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n", 4296 tx_queues, BOND_DEFAULT_TX_QUEUES); 4297 tx_queues = BOND_DEFAULT_TX_QUEUES; 4298 } 4299 4300 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 4301 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n", 4302 all_slaves_active); 4303 all_slaves_active = 0; 4304 } 4305 4306 if (resend_igmp < 0 || resend_igmp > 255) { 4307 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n", 4308 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 4309 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 4310 } 4311 4312 bond_opt_initval(&newval, packets_per_slave); 4313 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) { 4314 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n", 4315 packets_per_slave, USHRT_MAX); 4316 packets_per_slave = 1; 4317 } 4318 4319 if (bond_mode == BOND_MODE_ALB) { 4320 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", 4321 updelay); 4322 } 4323 4324 if (!miimon) { 4325 if (updelay || downdelay) { 4326 /* just warn the user the up/down delay will have 4327 * no effect since miimon is zero... 4328 */ 4329 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", 4330 updelay, downdelay); 4331 } 4332 } else { 4333 /* don't allow arp monitoring */ 4334 if (arp_interval) { 4335 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 4336 miimon, arp_interval); 4337 arp_interval = 0; 4338 } 4339 4340 if ((updelay % miimon) != 0) { 4341 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 4342 updelay, miimon, (updelay / miimon) * miimon); 4343 } 4344 4345 updelay /= miimon; 4346 4347 if ((downdelay % miimon) != 0) { 4348 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 4349 downdelay, miimon, 4350 (downdelay / miimon) * miimon); 4351 } 4352 4353 downdelay /= miimon; 4354 } 4355 4356 if (arp_interval < 0) { 4357 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4358 arp_interval, INT_MAX); 4359 arp_interval = 0; 4360 } 4361 4362 for (arp_ip_count = 0, i = 0; 4363 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) { 4364 __be32 ip; 4365 4366 /* not a complete check, but good enough to catch mistakes */ 4367 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) || 4368 !bond_is_ip_target_ok(ip)) { 4369 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 4370 arp_ip_target[i]); 4371 arp_interval = 0; 4372 } else { 4373 if (bond_get_targets_ip(arp_target, ip) == -1) 4374 arp_target[arp_ip_count++] = ip; 4375 else 4376 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n", 4377 &ip); 4378 } 4379 } 4380 4381 if (arp_interval && !arp_ip_count) { 4382 /* don't allow arping if no arp_ip_target given... */ 4383 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 4384 arp_interval); 4385 arp_interval = 0; 4386 } 4387 4388 if (arp_validate) { 4389 if (!arp_interval) { 4390 pr_err("arp_validate requires arp_interval\n"); 4391 return -EINVAL; 4392 } 4393 4394 bond_opt_initstr(&newval, arp_validate); 4395 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE), 4396 &newval); 4397 if (!valptr) { 4398 pr_err("Error: invalid arp_validate \"%s\"\n", 4399 arp_validate); 4400 return -EINVAL; 4401 } 4402 arp_validate_value = valptr->value; 4403 } else { 4404 arp_validate_value = 0; 4405 } 4406 4407 arp_all_targets_value = 0; 4408 if (arp_all_targets) { 4409 bond_opt_initstr(&newval, arp_all_targets); 4410 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS), 4411 &newval); 4412 if (!valptr) { 4413 pr_err("Error: invalid arp_all_targets_value \"%s\"\n", 4414 arp_all_targets); 4415 arp_all_targets_value = 0; 4416 } else { 4417 arp_all_targets_value = valptr->value; 4418 } 4419 } 4420 4421 if (miimon) { 4422 pr_info("MII link monitoring set to %d ms\n", miimon); 4423 } else if (arp_interval) { 4424 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE, 4425 arp_validate_value); 4426 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 4427 arp_interval, valptr->string, arp_ip_count); 4428 4429 for (i = 0; i < arp_ip_count; i++) 4430 pr_cont(" %s", arp_ip_target[i]); 4431 4432 pr_cont("\n"); 4433 4434 } else if (max_bonds) { 4435 /* miimon and arp_interval not set, we need one so things 4436 * work as expected, see bonding.txt for details 4437 */ 4438 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"); 4439 } 4440 4441 if (primary && !bond_mode_uses_primary(bond_mode)) { 4442 /* currently, using a primary only makes sense 4443 * in active backup, TLB or ALB modes 4444 */ 4445 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n", 4446 primary, bond_mode_name(bond_mode)); 4447 primary = NULL; 4448 } 4449 4450 if (primary && primary_reselect) { 4451 bond_opt_initstr(&newval, primary_reselect); 4452 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT), 4453 &newval); 4454 if (!valptr) { 4455 pr_err("Error: Invalid primary_reselect \"%s\"\n", 4456 primary_reselect); 4457 return -EINVAL; 4458 } 4459 primary_reselect_value = valptr->value; 4460 } else { 4461 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 4462 } 4463 4464 if (fail_over_mac) { 4465 bond_opt_initstr(&newval, fail_over_mac); 4466 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC), 4467 &newval); 4468 if (!valptr) { 4469 pr_err("Error: invalid fail_over_mac \"%s\"\n", 4470 fail_over_mac); 4471 return -EINVAL; 4472 } 4473 fail_over_mac_value = valptr->value; 4474 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 4475 pr_warn("Warning: fail_over_mac only affects active-backup mode\n"); 4476 } else { 4477 fail_over_mac_value = BOND_FOM_NONE; 4478 } 4479 4480 bond_opt_initstr(&newval, "default"); 4481 valptr = bond_opt_parse( 4482 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO), 4483 &newval); 4484 if (!valptr) { 4485 pr_err("Error: No ad_actor_sys_prio default value"); 4486 return -EINVAL; 4487 } 4488 ad_actor_sys_prio = valptr->value; 4489 4490 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY), 4491 &newval); 4492 if (!valptr) { 4493 pr_err("Error: No ad_user_port_key default value"); 4494 return -EINVAL; 4495 } 4496 ad_user_port_key = valptr->value; 4497 4498 if (lp_interval == 0) { 4499 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n", 4500 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL); 4501 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 4502 } 4503 4504 /* fill params struct with the proper values */ 4505 params->mode = bond_mode; 4506 params->xmit_policy = xmit_hashtype; 4507 params->miimon = miimon; 4508 params->num_peer_notif = num_peer_notif; 4509 params->arp_interval = arp_interval; 4510 params->arp_validate = arp_validate_value; 4511 params->arp_all_targets = arp_all_targets_value; 4512 params->updelay = updelay; 4513 params->downdelay = downdelay; 4514 params->use_carrier = use_carrier; 4515 params->lacp_fast = lacp_fast; 4516 params->primary[0] = 0; 4517 params->primary_reselect = primary_reselect_value; 4518 params->fail_over_mac = fail_over_mac_value; 4519 params->tx_queues = tx_queues; 4520 params->all_slaves_active = all_slaves_active; 4521 params->resend_igmp = resend_igmp; 4522 params->min_links = min_links; 4523 params->lp_interval = lp_interval; 4524 params->packets_per_slave = packets_per_slave; 4525 params->tlb_dynamic_lb = 1; /* Default value */ 4526 params->ad_actor_sys_prio = ad_actor_sys_prio; 4527 eth_zero_addr(params->ad_actor_system); 4528 params->ad_user_port_key = ad_user_port_key; 4529 if (packets_per_slave > 0) { 4530 params->reciprocal_packets_per_slave = 4531 reciprocal_value(packets_per_slave); 4532 } else { 4533 /* reciprocal_packets_per_slave is unused if 4534 * packets_per_slave is 0 or 1, just initialize it 4535 */ 4536 params->reciprocal_packets_per_slave = 4537 (struct reciprocal_value) { 0 }; 4538 } 4539 4540 if (primary) { 4541 strncpy(params->primary, primary, IFNAMSIZ); 4542 params->primary[IFNAMSIZ - 1] = 0; 4543 } 4544 4545 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 4546 4547 return 0; 4548 } 4549 4550 static struct lock_class_key bonding_netdev_xmit_lock_key; 4551 static struct lock_class_key bonding_netdev_addr_lock_key; 4552 static struct lock_class_key bonding_tx_busylock_key; 4553 4554 static void bond_set_lockdep_class_one(struct net_device *dev, 4555 struct netdev_queue *txq, 4556 void *_unused) 4557 { 4558 lockdep_set_class(&txq->_xmit_lock, 4559 &bonding_netdev_xmit_lock_key); 4560 } 4561 4562 static void bond_set_lockdep_class(struct net_device *dev) 4563 { 4564 lockdep_set_class(&dev->addr_list_lock, 4565 &bonding_netdev_addr_lock_key); 4566 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL); 4567 dev->qdisc_tx_busylock = &bonding_tx_busylock_key; 4568 } 4569 4570 /* Called from registration process */ 4571 static int bond_init(struct net_device *bond_dev) 4572 { 4573 struct bonding *bond = netdev_priv(bond_dev); 4574 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 4575 4576 netdev_dbg(bond_dev, "Begin bond_init\n"); 4577 4578 bond->wq = create_singlethread_workqueue(bond_dev->name); 4579 if (!bond->wq) 4580 return -ENOMEM; 4581 4582 bond_set_lockdep_class(bond_dev); 4583 4584 list_add_tail(&bond->bond_list, &bn->dev_list); 4585 4586 bond_prepare_sysfs_group(bond); 4587 4588 bond_debug_register(bond); 4589 4590 /* Ensure valid dev_addr */ 4591 if (is_zero_ether_addr(bond_dev->dev_addr) && 4592 bond_dev->addr_assign_type == NET_ADDR_PERM) 4593 eth_hw_addr_random(bond_dev); 4594 4595 return 0; 4596 } 4597 4598 unsigned int bond_get_num_tx_queues(void) 4599 { 4600 return tx_queues; 4601 } 4602 4603 /* Create a new bond based on the specified name and bonding parameters. 4604 * If name is NULL, obtain a suitable "bond%d" name for us. 4605 * Caller must NOT hold rtnl_lock; we need to release it here before we 4606 * set up our sysfs entries. 4607 */ 4608 int bond_create(struct net *net, const char *name) 4609 { 4610 struct net_device *bond_dev; 4611 struct bonding *bond; 4612 struct alb_bond_info *bond_info; 4613 int res; 4614 4615 rtnl_lock(); 4616 4617 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 4618 name ? name : "bond%d", NET_NAME_UNKNOWN, 4619 bond_setup, tx_queues); 4620 if (!bond_dev) { 4621 pr_err("%s: eek! can't alloc netdev!\n", name); 4622 rtnl_unlock(); 4623 return -ENOMEM; 4624 } 4625 4626 /* 4627 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX. 4628 * It is set to 0 by default which is wrong. 4629 */ 4630 bond = netdev_priv(bond_dev); 4631 bond_info = &(BOND_ALB_INFO(bond)); 4632 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; 4633 4634 dev_net_set(bond_dev, net); 4635 bond_dev->rtnl_link_ops = &bond_link_ops; 4636 4637 res = register_netdevice(bond_dev); 4638 4639 netif_carrier_off(bond_dev); 4640 4641 rtnl_unlock(); 4642 if (res < 0) 4643 bond_destructor(bond_dev); 4644 return res; 4645 } 4646 4647 static int __net_init bond_net_init(struct net *net) 4648 { 4649 struct bond_net *bn = net_generic(net, bond_net_id); 4650 4651 bn->net = net; 4652 INIT_LIST_HEAD(&bn->dev_list); 4653 4654 bond_create_proc_dir(bn); 4655 bond_create_sysfs(bn); 4656 4657 return 0; 4658 } 4659 4660 static void __net_exit bond_net_exit(struct net *net) 4661 { 4662 struct bond_net *bn = net_generic(net, bond_net_id); 4663 struct bonding *bond, *tmp_bond; 4664 LIST_HEAD(list); 4665 4666 bond_destroy_sysfs(bn); 4667 4668 /* Kill off any bonds created after unregistering bond rtnl ops */ 4669 rtnl_lock(); 4670 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list) 4671 unregister_netdevice_queue(bond->dev, &list); 4672 unregister_netdevice_many(&list); 4673 rtnl_unlock(); 4674 4675 bond_destroy_proc_dir(bn); 4676 } 4677 4678 static struct pernet_operations bond_net_ops = { 4679 .init = bond_net_init, 4680 .exit = bond_net_exit, 4681 .id = &bond_net_id, 4682 .size = sizeof(struct bond_net), 4683 }; 4684 4685 static int __init bonding_init(void) 4686 { 4687 int i; 4688 int res; 4689 4690 pr_info("%s", bond_version); 4691 4692 res = bond_check_params(&bonding_defaults); 4693 if (res) 4694 goto out; 4695 4696 res = register_pernet_subsys(&bond_net_ops); 4697 if (res) 4698 goto out; 4699 4700 res = bond_netlink_init(); 4701 if (res) 4702 goto err_link; 4703 4704 bond_create_debugfs(); 4705 4706 for (i = 0; i < max_bonds; i++) { 4707 res = bond_create(&init_net, NULL); 4708 if (res) 4709 goto err; 4710 } 4711 4712 register_netdevice_notifier(&bond_netdev_notifier); 4713 out: 4714 return res; 4715 err: 4716 bond_destroy_debugfs(); 4717 bond_netlink_fini(); 4718 err_link: 4719 unregister_pernet_subsys(&bond_net_ops); 4720 goto out; 4721 4722 } 4723 4724 static void __exit bonding_exit(void) 4725 { 4726 unregister_netdevice_notifier(&bond_netdev_notifier); 4727 4728 bond_destroy_debugfs(); 4729 4730 bond_netlink_fini(); 4731 unregister_pernet_subsys(&bond_net_ops); 4732 4733 #ifdef CONFIG_NET_POLL_CONTROLLER 4734 /* Make sure we don't have an imbalance on our netpoll blocking */ 4735 WARN_ON(atomic_read(&netpoll_block_tx)); 4736 #endif 4737 } 4738 4739 module_init(bonding_init); 4740 module_exit(bonding_exit); 4741 MODULE_LICENSE("GPL"); 4742 MODULE_VERSION(DRV_VERSION); 4743 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION); 4744 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 4745