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