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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 35 36 #include <linux/kernel.h> 37 #include <linux/module.h> 38 #include <linux/types.h> 39 #include <linux/fcntl.h> 40 #include <linux/interrupt.h> 41 #include <linux/ptrace.h> 42 #include <linux/ioport.h> 43 #include <linux/in.h> 44 #include <net/ip.h> 45 #include <linux/ip.h> 46 #include <linux/tcp.h> 47 #include <linux/udp.h> 48 #include <linux/slab.h> 49 #include <linux/string.h> 50 #include <linux/init.h> 51 #include <linux/timer.h> 52 #include <linux/socket.h> 53 #include <linux/ctype.h> 54 #include <linux/inet.h> 55 #include <linux/bitops.h> 56 #include <linux/io.h> 57 #include <asm/system.h> 58 #include <asm/dma.h> 59 #include <linux/uaccess.h> 60 #include <linux/errno.h> 61 #include <linux/netdevice.h> 62 #include <linux/inetdevice.h> 63 #include <linux/igmp.h> 64 #include <linux/etherdevice.h> 65 #include <linux/skbuff.h> 66 #include <net/sock.h> 67 #include <linux/rtnetlink.h> 68 #include <linux/smp.h> 69 #include <linux/if_ether.h> 70 #include <net/arp.h> 71 #include <linux/mii.h> 72 #include <linux/ethtool.h> 73 #include <linux/if_vlan.h> 74 #include <linux/if_bonding.h> 75 #include <linux/jiffies.h> 76 #include <linux/preempt.h> 77 #include <net/route.h> 78 #include <net/net_namespace.h> 79 #include <net/netns/generic.h> 80 #include "bonding.h" 81 #include "bond_3ad.h" 82 #include "bond_alb.h" 83 84 /*---------------------------- Module parameters ----------------------------*/ 85 86 /* monitor all links that often (in milliseconds). <=0 disables monitoring */ 87 #define BOND_LINK_MON_INTERV 0 88 #define BOND_LINK_ARP_INTERV 0 89 90 static int max_bonds = BOND_DEFAULT_MAX_BONDS; 91 static int tx_queues = BOND_DEFAULT_TX_QUEUES; 92 static int num_peer_notif = 1; 93 static int miimon = BOND_LINK_MON_INTERV; 94 static int updelay; 95 static int downdelay; 96 static int use_carrier = 1; 97 static char *mode; 98 static char *primary; 99 static char *primary_reselect; 100 static char *lacp_rate; 101 static char *ad_select; 102 static char *xmit_hash_policy; 103 static int arp_interval = BOND_LINK_ARP_INTERV; 104 static char *arp_ip_target[BOND_MAX_ARP_TARGETS]; 105 static char *arp_validate; 106 static char *fail_over_mac; 107 static int all_slaves_active = 0; 108 static struct bond_params bonding_defaults; 109 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP; 110 111 module_param(max_bonds, int, 0); 112 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices"); 113 module_param(tx_queues, int, 0); 114 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)"); 115 module_param_named(num_grat_arp, num_peer_notif, int, 0644); 116 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on " 117 "failover event (alias of num_unsol_na)"); 118 module_param_named(num_unsol_na, num_peer_notif, int, 0644); 119 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on " 120 "failover event (alias of num_grat_arp)"); 121 module_param(miimon, int, 0); 122 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds"); 123 module_param(updelay, int, 0); 124 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds"); 125 module_param(downdelay, int, 0); 126 MODULE_PARM_DESC(downdelay, "Delay before considering link down, " 127 "in milliseconds"); 128 module_param(use_carrier, int, 0); 129 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; " 130 "0 for off, 1 for on (default)"); 131 module_param(mode, charp, 0); 132 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, " 133 "1 for active-backup, 2 for balance-xor, " 134 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, " 135 "6 for balance-alb"); 136 module_param(primary, charp, 0); 137 MODULE_PARM_DESC(primary, "Primary network device to use"); 138 module_param(primary_reselect, charp, 0); 139 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave " 140 "once it comes up; " 141 "0 for always (default), " 142 "1 for only if speed of primary is " 143 "better, " 144 "2 for only on active slave " 145 "failure"); 146 module_param(lacp_rate, charp, 0); 147 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; " 148 "0 for slow, 1 for fast"); 149 module_param(ad_select, charp, 0); 150 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; " 151 "0 for stable (default), 1 for bandwidth, " 152 "2 for count"); 153 module_param(xmit_hash_policy, charp, 0); 154 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; " 155 "0 for layer 2 (default), 1 for layer 3+4, " 156 "2 for layer 2+3"); 157 module_param(arp_interval, int, 0); 158 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds"); 159 module_param_array(arp_ip_target, charp, NULL, 0); 160 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form"); 161 module_param(arp_validate, charp, 0); 162 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; " 163 "0 for none (default), 1 for active, " 164 "2 for backup, 3 for all"); 165 module_param(fail_over_mac, charp, 0); 166 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to " 167 "the same MAC; 0 for none (default), " 168 "1 for active, 2 for follow"); 169 module_param(all_slaves_active, int, 0); 170 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface" 171 "by setting active flag for all slaves; " 172 "0 for never (default), 1 for always."); 173 module_param(resend_igmp, int, 0); 174 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on " 175 "link failure"); 176 177 /*----------------------------- Global variables ----------------------------*/ 178 179 #ifdef CONFIG_NET_POLL_CONTROLLER 180 atomic_t netpoll_block_tx = ATOMIC_INIT(0); 181 #endif 182 183 int bond_net_id __read_mostly; 184 185 static __be32 arp_target[BOND_MAX_ARP_TARGETS]; 186 static int arp_ip_count; 187 static int bond_mode = BOND_MODE_ROUNDROBIN; 188 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2; 189 static int lacp_fast; 190 191 const struct bond_parm_tbl bond_lacp_tbl[] = { 192 { "slow", AD_LACP_SLOW}, 193 { "fast", AD_LACP_FAST}, 194 { NULL, -1}, 195 }; 196 197 const struct bond_parm_tbl bond_mode_tbl[] = { 198 { "balance-rr", BOND_MODE_ROUNDROBIN}, 199 { "active-backup", BOND_MODE_ACTIVEBACKUP}, 200 { "balance-xor", BOND_MODE_XOR}, 201 { "broadcast", BOND_MODE_BROADCAST}, 202 { "802.3ad", BOND_MODE_8023AD}, 203 { "balance-tlb", BOND_MODE_TLB}, 204 { "balance-alb", BOND_MODE_ALB}, 205 { NULL, -1}, 206 }; 207 208 const struct bond_parm_tbl xmit_hashtype_tbl[] = { 209 { "layer2", BOND_XMIT_POLICY_LAYER2}, 210 { "layer3+4", BOND_XMIT_POLICY_LAYER34}, 211 { "layer2+3", BOND_XMIT_POLICY_LAYER23}, 212 { NULL, -1}, 213 }; 214 215 const struct bond_parm_tbl arp_validate_tbl[] = { 216 { "none", BOND_ARP_VALIDATE_NONE}, 217 { "active", BOND_ARP_VALIDATE_ACTIVE}, 218 { "backup", BOND_ARP_VALIDATE_BACKUP}, 219 { "all", BOND_ARP_VALIDATE_ALL}, 220 { NULL, -1}, 221 }; 222 223 const struct bond_parm_tbl fail_over_mac_tbl[] = { 224 { "none", BOND_FOM_NONE}, 225 { "active", BOND_FOM_ACTIVE}, 226 { "follow", BOND_FOM_FOLLOW}, 227 { NULL, -1}, 228 }; 229 230 const struct bond_parm_tbl pri_reselect_tbl[] = { 231 { "always", BOND_PRI_RESELECT_ALWAYS}, 232 { "better", BOND_PRI_RESELECT_BETTER}, 233 { "failure", BOND_PRI_RESELECT_FAILURE}, 234 { NULL, -1}, 235 }; 236 237 struct bond_parm_tbl ad_select_tbl[] = { 238 { "stable", BOND_AD_STABLE}, 239 { "bandwidth", BOND_AD_BANDWIDTH}, 240 { "count", BOND_AD_COUNT}, 241 { NULL, -1}, 242 }; 243 244 /*-------------------------- Forward declarations ---------------------------*/ 245 246 static int bond_init(struct net_device *bond_dev); 247 static void bond_uninit(struct net_device *bond_dev); 248 249 /*---------------------------- General routines -----------------------------*/ 250 251 const char *bond_mode_name(int mode) 252 { 253 static const char *names[] = { 254 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)", 255 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)", 256 [BOND_MODE_XOR] = "load balancing (xor)", 257 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)", 258 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation", 259 [BOND_MODE_TLB] = "transmit load balancing", 260 [BOND_MODE_ALB] = "adaptive load balancing", 261 }; 262 263 if (mode < 0 || mode > BOND_MODE_ALB) 264 return "unknown"; 265 266 return names[mode]; 267 } 268 269 /*---------------------------------- VLAN -----------------------------------*/ 270 271 /** 272 * bond_add_vlan - add a new vlan id on bond 273 * @bond: bond that got the notification 274 * @vlan_id: the vlan id to add 275 * 276 * Returns -ENOMEM if allocation failed. 277 */ 278 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id) 279 { 280 struct vlan_entry *vlan; 281 282 pr_debug("bond: %s, vlan id %d\n", 283 (bond ? bond->dev->name : "None"), vlan_id); 284 285 vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL); 286 if (!vlan) 287 return -ENOMEM; 288 289 INIT_LIST_HEAD(&vlan->vlan_list); 290 vlan->vlan_id = vlan_id; 291 292 write_lock_bh(&bond->lock); 293 294 list_add_tail(&vlan->vlan_list, &bond->vlan_list); 295 296 write_unlock_bh(&bond->lock); 297 298 pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name); 299 300 return 0; 301 } 302 303 /** 304 * bond_del_vlan - delete a vlan id from bond 305 * @bond: bond that got the notification 306 * @vlan_id: the vlan id to delete 307 * 308 * returns -ENODEV if @vlan_id was not found in @bond. 309 */ 310 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id) 311 { 312 struct vlan_entry *vlan; 313 int res = -ENODEV; 314 315 pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id); 316 317 block_netpoll_tx(); 318 write_lock_bh(&bond->lock); 319 320 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 321 if (vlan->vlan_id == vlan_id) { 322 list_del(&vlan->vlan_list); 323 324 if (bond_is_lb(bond)) 325 bond_alb_clear_vlan(bond, vlan_id); 326 327 pr_debug("removed VLAN ID %d from bond %s\n", 328 vlan_id, bond->dev->name); 329 330 kfree(vlan); 331 332 if (list_empty(&bond->vlan_list) && 333 (bond->slave_cnt == 0)) { 334 /* Last VLAN removed and no slaves, so 335 * restore block on adding VLANs. This will 336 * be removed once new slaves that are not 337 * VLAN challenged will be added. 338 */ 339 bond->dev->features |= NETIF_F_VLAN_CHALLENGED; 340 } 341 342 res = 0; 343 goto out; 344 } 345 } 346 347 pr_debug("couldn't find VLAN ID %d in bond %s\n", 348 vlan_id, bond->dev->name); 349 350 out: 351 write_unlock_bh(&bond->lock); 352 unblock_netpoll_tx(); 353 return res; 354 } 355 356 /** 357 * bond_next_vlan - safely skip to the next item in the vlans list. 358 * @bond: the bond we're working on 359 * @curr: item we're advancing from 360 * 361 * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL, 362 * or @curr->next otherwise (even if it is @curr itself again). 363 * 364 * Caller must hold bond->lock 365 */ 366 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr) 367 { 368 struct vlan_entry *next, *last; 369 370 if (list_empty(&bond->vlan_list)) 371 return NULL; 372 373 if (!curr) { 374 next = list_entry(bond->vlan_list.next, 375 struct vlan_entry, vlan_list); 376 } else { 377 last = list_entry(bond->vlan_list.prev, 378 struct vlan_entry, vlan_list); 379 if (last == curr) { 380 next = list_entry(bond->vlan_list.next, 381 struct vlan_entry, vlan_list); 382 } else { 383 next = list_entry(curr->vlan_list.next, 384 struct vlan_entry, vlan_list); 385 } 386 } 387 388 return next; 389 } 390 391 #define bond_queue_mapping(skb) (*(u16 *)((skb)->cb)) 392 393 /** 394 * bond_dev_queue_xmit - Prepare skb for xmit. 395 * 396 * @bond: bond device that got this skb for tx. 397 * @skb: hw accel VLAN tagged skb to transmit 398 * @slave_dev: slave that is supposed to xmit this skbuff 399 */ 400 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, 401 struct net_device *slave_dev) 402 { 403 skb->dev = slave_dev; 404 skb->priority = 1; 405 406 skb->queue_mapping = bond_queue_mapping(skb); 407 408 if (unlikely(netpoll_tx_running(slave_dev))) 409 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb); 410 else 411 dev_queue_xmit(skb); 412 413 return 0; 414 } 415 416 /* 417 * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid 418 * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a 419 * lock because: 420 * a. This operation is performed in IOCTL context, 421 * b. The operation is protected by the RTNL semaphore in the 8021q code, 422 * c. Holding a lock with BH disabled while directly calling a base driver 423 * entry point is generally a BAD idea. 424 * 425 * The design of synchronization/protection for this operation in the 8021q 426 * module is good for one or more VLAN devices over a single physical device 427 * and cannot be extended for a teaming solution like bonding, so there is a 428 * potential race condition here where a net device from the vlan group might 429 * be referenced (either by a base driver or the 8021q code) while it is being 430 * removed from the system. However, it turns out we're not making matters 431 * worse, and if it works for regular VLAN usage it will work here too. 432 */ 433 434 /** 435 * bond_vlan_rx_register - Propagates registration to slaves 436 * @bond_dev: bonding net device that got called 437 * @grp: vlan group being registered 438 */ 439 static void bond_vlan_rx_register(struct net_device *bond_dev, 440 struct vlan_group *grp) 441 { 442 struct bonding *bond = netdev_priv(bond_dev); 443 struct slave *slave; 444 int i; 445 446 write_lock_bh(&bond->lock); 447 bond->vlgrp = grp; 448 write_unlock_bh(&bond->lock); 449 450 bond_for_each_slave(bond, slave, i) { 451 struct net_device *slave_dev = slave->dev; 452 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 453 454 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) && 455 slave_ops->ndo_vlan_rx_register) { 456 slave_ops->ndo_vlan_rx_register(slave_dev, grp); 457 } 458 } 459 } 460 461 /** 462 * bond_vlan_rx_add_vid - Propagates adding an id to slaves 463 * @bond_dev: bonding net device that got called 464 * @vid: vlan id being added 465 */ 466 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid) 467 { 468 struct bonding *bond = netdev_priv(bond_dev); 469 struct slave *slave; 470 int i, res; 471 472 bond_for_each_slave(bond, slave, i) { 473 struct net_device *slave_dev = slave->dev; 474 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 475 476 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) && 477 slave_ops->ndo_vlan_rx_add_vid) { 478 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid); 479 } 480 } 481 482 res = bond_add_vlan(bond, vid); 483 if (res) { 484 pr_err("%s: Error: Failed to add vlan id %d\n", 485 bond_dev->name, vid); 486 } 487 } 488 489 /** 490 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves 491 * @bond_dev: bonding net device that got called 492 * @vid: vlan id being removed 493 */ 494 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid) 495 { 496 struct bonding *bond = netdev_priv(bond_dev); 497 struct slave *slave; 498 struct net_device *vlan_dev; 499 int i, res; 500 501 bond_for_each_slave(bond, slave, i) { 502 struct net_device *slave_dev = slave->dev; 503 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 504 505 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) && 506 slave_ops->ndo_vlan_rx_kill_vid) { 507 /* Save and then restore vlan_dev in the grp array, 508 * since the slave's driver might clear it. 509 */ 510 vlan_dev = vlan_group_get_device(bond->vlgrp, vid); 511 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid); 512 vlan_group_set_device(bond->vlgrp, vid, vlan_dev); 513 } 514 } 515 516 res = bond_del_vlan(bond, vid); 517 if (res) { 518 pr_err("%s: Error: Failed to remove vlan id %d\n", 519 bond_dev->name, vid); 520 } 521 } 522 523 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev) 524 { 525 struct vlan_entry *vlan; 526 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 527 528 if (!bond->vlgrp) 529 return; 530 531 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) && 532 slave_ops->ndo_vlan_rx_register) 533 slave_ops->ndo_vlan_rx_register(slave_dev, bond->vlgrp); 534 535 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) || 536 !(slave_ops->ndo_vlan_rx_add_vid)) 537 return; 538 539 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) 540 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id); 541 } 542 543 static void bond_del_vlans_from_slave(struct bonding *bond, 544 struct net_device *slave_dev) 545 { 546 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 547 struct vlan_entry *vlan; 548 struct net_device *vlan_dev; 549 550 if (!bond->vlgrp) 551 return; 552 553 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) || 554 !(slave_ops->ndo_vlan_rx_kill_vid)) 555 goto unreg; 556 557 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 558 if (!vlan->vlan_id) 559 continue; 560 /* Save and then restore vlan_dev in the grp array, 561 * since the slave's driver might clear it. 562 */ 563 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id); 564 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id); 565 vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev); 566 } 567 568 unreg: 569 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) && 570 slave_ops->ndo_vlan_rx_register) 571 slave_ops->ndo_vlan_rx_register(slave_dev, NULL); 572 } 573 574 /*------------------------------- Link status -------------------------------*/ 575 576 /* 577 * Set the carrier state for the master according to the state of its 578 * slaves. If any slaves are up, the master is up. In 802.3ad mode, 579 * do special 802.3ad magic. 580 * 581 * Returns zero if carrier state does not change, nonzero if it does. 582 */ 583 static int bond_set_carrier(struct bonding *bond) 584 { 585 struct slave *slave; 586 int i; 587 588 if (bond->slave_cnt == 0) 589 goto down; 590 591 if (bond->params.mode == BOND_MODE_8023AD) 592 return bond_3ad_set_carrier(bond); 593 594 bond_for_each_slave(bond, slave, i) { 595 if (slave->link == BOND_LINK_UP) { 596 if (!netif_carrier_ok(bond->dev)) { 597 netif_carrier_on(bond->dev); 598 return 1; 599 } 600 return 0; 601 } 602 } 603 604 down: 605 if (netif_carrier_ok(bond->dev)) { 606 netif_carrier_off(bond->dev); 607 return 1; 608 } 609 return 0; 610 } 611 612 /* 613 * Get link speed and duplex from the slave's base driver 614 * using ethtool. If for some reason the call fails or the 615 * values are invalid, fake speed and duplex to 100/Full 616 * and return error. 617 */ 618 static int bond_update_speed_duplex(struct slave *slave) 619 { 620 struct net_device *slave_dev = slave->dev; 621 struct ethtool_cmd etool = { .cmd = ETHTOOL_GSET }; 622 u32 slave_speed; 623 int res; 624 625 /* Fake speed and duplex */ 626 slave->speed = SPEED_100; 627 slave->duplex = DUPLEX_FULL; 628 629 if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings) 630 return -1; 631 632 res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool); 633 if (res < 0) 634 return -1; 635 636 slave_speed = ethtool_cmd_speed(&etool); 637 switch (slave_speed) { 638 case SPEED_10: 639 case SPEED_100: 640 case SPEED_1000: 641 case SPEED_10000: 642 break; 643 default: 644 return -1; 645 } 646 647 switch (etool.duplex) { 648 case DUPLEX_FULL: 649 case DUPLEX_HALF: 650 break; 651 default: 652 return -1; 653 } 654 655 slave->speed = slave_speed; 656 slave->duplex = etool.duplex; 657 658 return 0; 659 } 660 661 /* 662 * if <dev> supports MII link status reporting, check its link status. 663 * 664 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), 665 * depending upon the setting of the use_carrier parameter. 666 * 667 * Return either BMSR_LSTATUS, meaning that the link is up (or we 668 * can't tell and just pretend it is), or 0, meaning that the link is 669 * down. 670 * 671 * If reporting is non-zero, instead of faking link up, return -1 if 672 * both ETHTOOL and MII ioctls fail (meaning the device does not 673 * support them). If use_carrier is set, return whatever it says. 674 * It'd be nice if there was a good way to tell if a driver supports 675 * netif_carrier, but there really isn't. 676 */ 677 static int bond_check_dev_link(struct bonding *bond, 678 struct net_device *slave_dev, int reporting) 679 { 680 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 681 int (*ioctl)(struct net_device *, struct ifreq *, int); 682 struct ifreq ifr; 683 struct mii_ioctl_data *mii; 684 685 if (!reporting && !netif_running(slave_dev)) 686 return 0; 687 688 if (bond->params.use_carrier) 689 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; 690 691 /* Try to get link status using Ethtool first. */ 692 if (slave_dev->ethtool_ops) { 693 if (slave_dev->ethtool_ops->get_link) { 694 u32 link; 695 696 link = slave_dev->ethtool_ops->get_link(slave_dev); 697 698 return link ? BMSR_LSTATUS : 0; 699 } 700 } 701 702 /* Ethtool can't be used, fallback to MII ioctls. */ 703 ioctl = slave_ops->ndo_do_ioctl; 704 if (ioctl) { 705 /* TODO: set pointer to correct ioctl on a per team member */ 706 /* bases to make this more efficient. that is, once */ 707 /* we determine the correct ioctl, we will always */ 708 /* call it and not the others for that team */ 709 /* member. */ 710 711 /* 712 * We cannot assume that SIOCGMIIPHY will also read a 713 * register; not all network drivers (e.g., e100) 714 * support that. 715 */ 716 717 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ 718 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ); 719 mii = if_mii(&ifr); 720 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) { 721 mii->reg_num = MII_BMSR; 722 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) 723 return mii->val_out & BMSR_LSTATUS; 724 } 725 } 726 727 /* 728 * If reporting, report that either there's no dev->do_ioctl, 729 * or both SIOCGMIIREG and get_link failed (meaning that we 730 * cannot report link status). If not reporting, pretend 731 * we're ok. 732 */ 733 return reporting ? -1 : BMSR_LSTATUS; 734 } 735 736 /*----------------------------- Multicast list ------------------------------*/ 737 738 /* 739 * Push the promiscuity flag down to appropriate slaves 740 */ 741 static int bond_set_promiscuity(struct bonding *bond, int inc) 742 { 743 int err = 0; 744 if (USES_PRIMARY(bond->params.mode)) { 745 /* write lock already acquired */ 746 if (bond->curr_active_slave) { 747 err = dev_set_promiscuity(bond->curr_active_slave->dev, 748 inc); 749 } 750 } else { 751 struct slave *slave; 752 int i; 753 bond_for_each_slave(bond, slave, i) { 754 err = dev_set_promiscuity(slave->dev, inc); 755 if (err) 756 return err; 757 } 758 } 759 return err; 760 } 761 762 /* 763 * Push the allmulti flag down to all slaves 764 */ 765 static int bond_set_allmulti(struct bonding *bond, int inc) 766 { 767 int err = 0; 768 if (USES_PRIMARY(bond->params.mode)) { 769 /* write lock already acquired */ 770 if (bond->curr_active_slave) { 771 err = dev_set_allmulti(bond->curr_active_slave->dev, 772 inc); 773 } 774 } else { 775 struct slave *slave; 776 int i; 777 bond_for_each_slave(bond, slave, i) { 778 err = dev_set_allmulti(slave->dev, inc); 779 if (err) 780 return err; 781 } 782 } 783 return err; 784 } 785 786 /* 787 * Add a Multicast address to slaves 788 * according to mode 789 */ 790 static void bond_mc_add(struct bonding *bond, void *addr) 791 { 792 if (USES_PRIMARY(bond->params.mode)) { 793 /* write lock already acquired */ 794 if (bond->curr_active_slave) 795 dev_mc_add(bond->curr_active_slave->dev, addr); 796 } else { 797 struct slave *slave; 798 int i; 799 800 bond_for_each_slave(bond, slave, i) 801 dev_mc_add(slave->dev, addr); 802 } 803 } 804 805 /* 806 * Remove a multicast address from slave 807 * according to mode 808 */ 809 static void bond_mc_del(struct bonding *bond, void *addr) 810 { 811 if (USES_PRIMARY(bond->params.mode)) { 812 /* write lock already acquired */ 813 if (bond->curr_active_slave) 814 dev_mc_del(bond->curr_active_slave->dev, addr); 815 } else { 816 struct slave *slave; 817 int i; 818 bond_for_each_slave(bond, slave, i) { 819 dev_mc_del(slave->dev, addr); 820 } 821 } 822 } 823 824 825 static void __bond_resend_igmp_join_requests(struct net_device *dev) 826 { 827 struct in_device *in_dev; 828 829 rcu_read_lock(); 830 in_dev = __in_dev_get_rcu(dev); 831 if (in_dev) 832 ip_mc_rejoin_groups(in_dev); 833 rcu_read_unlock(); 834 } 835 836 /* 837 * Retrieve the list of registered multicast addresses for the bonding 838 * device and retransmit an IGMP JOIN request to the current active 839 * slave. 840 */ 841 static void bond_resend_igmp_join_requests(struct bonding *bond) 842 { 843 struct net_device *vlan_dev; 844 struct vlan_entry *vlan; 845 846 read_lock(&bond->lock); 847 848 /* rejoin all groups on bond device */ 849 __bond_resend_igmp_join_requests(bond->dev); 850 851 /* rejoin all groups on vlan devices */ 852 if (bond->vlgrp) { 853 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 854 vlan_dev = vlan_group_get_device(bond->vlgrp, 855 vlan->vlan_id); 856 if (vlan_dev) 857 __bond_resend_igmp_join_requests(vlan_dev); 858 } 859 } 860 861 if (--bond->igmp_retrans > 0) 862 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); 863 864 read_unlock(&bond->lock); 865 } 866 867 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work) 868 { 869 struct bonding *bond = container_of(work, struct bonding, 870 mcast_work.work); 871 bond_resend_igmp_join_requests(bond); 872 } 873 874 /* 875 * flush all members of flush->mc_list from device dev->mc_list 876 */ 877 static void bond_mc_list_flush(struct net_device *bond_dev, 878 struct net_device *slave_dev) 879 { 880 struct bonding *bond = netdev_priv(bond_dev); 881 struct netdev_hw_addr *ha; 882 883 netdev_for_each_mc_addr(ha, bond_dev) 884 dev_mc_del(slave_dev, ha->addr); 885 886 if (bond->params.mode == BOND_MODE_8023AD) { 887 /* del lacpdu mc addr from mc list */ 888 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 889 890 dev_mc_del(slave_dev, lacpdu_multicast); 891 } 892 } 893 894 /*--------------------------- Active slave change ---------------------------*/ 895 896 /* 897 * Update the mc list and multicast-related flags for the new and 898 * old active slaves (if any) according to the multicast mode, and 899 * promiscuous flags unconditionally. 900 */ 901 static void bond_mc_swap(struct bonding *bond, struct slave *new_active, 902 struct slave *old_active) 903 { 904 struct netdev_hw_addr *ha; 905 906 if (!USES_PRIMARY(bond->params.mode)) 907 /* nothing to do - mc list is already up-to-date on 908 * all slaves 909 */ 910 return; 911 912 if (old_active) { 913 if (bond->dev->flags & IFF_PROMISC) 914 dev_set_promiscuity(old_active->dev, -1); 915 916 if (bond->dev->flags & IFF_ALLMULTI) 917 dev_set_allmulti(old_active->dev, -1); 918 919 netdev_for_each_mc_addr(ha, bond->dev) 920 dev_mc_del(old_active->dev, ha->addr); 921 } 922 923 if (new_active) { 924 /* FIXME: Signal errors upstream. */ 925 if (bond->dev->flags & IFF_PROMISC) 926 dev_set_promiscuity(new_active->dev, 1); 927 928 if (bond->dev->flags & IFF_ALLMULTI) 929 dev_set_allmulti(new_active->dev, 1); 930 931 netdev_for_each_mc_addr(ha, bond->dev) 932 dev_mc_add(new_active->dev, ha->addr); 933 } 934 } 935 936 /* 937 * bond_do_fail_over_mac 938 * 939 * Perform special MAC address swapping for fail_over_mac settings 940 * 941 * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh. 942 */ 943 static void bond_do_fail_over_mac(struct bonding *bond, 944 struct slave *new_active, 945 struct slave *old_active) 946 __releases(&bond->curr_slave_lock) 947 __releases(&bond->lock) 948 __acquires(&bond->lock) 949 __acquires(&bond->curr_slave_lock) 950 { 951 u8 tmp_mac[ETH_ALEN]; 952 struct sockaddr saddr; 953 int rv; 954 955 switch (bond->params.fail_over_mac) { 956 case BOND_FOM_ACTIVE: 957 if (new_active) 958 memcpy(bond->dev->dev_addr, new_active->dev->dev_addr, 959 new_active->dev->addr_len); 960 break; 961 case BOND_FOM_FOLLOW: 962 /* 963 * if new_active && old_active, swap them 964 * if just old_active, do nothing (going to no active slave) 965 * if just new_active, set new_active to bond's MAC 966 */ 967 if (!new_active) 968 return; 969 970 write_unlock_bh(&bond->curr_slave_lock); 971 read_unlock(&bond->lock); 972 973 if (old_active) { 974 memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN); 975 memcpy(saddr.sa_data, old_active->dev->dev_addr, 976 ETH_ALEN); 977 saddr.sa_family = new_active->dev->type; 978 } else { 979 memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN); 980 saddr.sa_family = bond->dev->type; 981 } 982 983 rv = dev_set_mac_address(new_active->dev, &saddr); 984 if (rv) { 985 pr_err("%s: Error %d setting MAC of slave %s\n", 986 bond->dev->name, -rv, new_active->dev->name); 987 goto out; 988 } 989 990 if (!old_active) 991 goto out; 992 993 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN); 994 saddr.sa_family = old_active->dev->type; 995 996 rv = dev_set_mac_address(old_active->dev, &saddr); 997 if (rv) 998 pr_err("%s: Error %d setting MAC of slave %s\n", 999 bond->dev->name, -rv, new_active->dev->name); 1000 out: 1001 read_lock(&bond->lock); 1002 write_lock_bh(&bond->curr_slave_lock); 1003 break; 1004 default: 1005 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n", 1006 bond->dev->name, bond->params.fail_over_mac); 1007 break; 1008 } 1009 1010 } 1011 1012 static bool bond_should_change_active(struct bonding *bond) 1013 { 1014 struct slave *prim = bond->primary_slave; 1015 struct slave *curr = bond->curr_active_slave; 1016 1017 if (!prim || !curr || curr->link != BOND_LINK_UP) 1018 return true; 1019 if (bond->force_primary) { 1020 bond->force_primary = false; 1021 return true; 1022 } 1023 if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER && 1024 (prim->speed < curr->speed || 1025 (prim->speed == curr->speed && prim->duplex <= curr->duplex))) 1026 return false; 1027 if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE) 1028 return false; 1029 return true; 1030 } 1031 1032 /** 1033 * find_best_interface - select the best available slave to be the active one 1034 * @bond: our bonding struct 1035 * 1036 * Warning: Caller must hold curr_slave_lock for writing. 1037 */ 1038 static struct slave *bond_find_best_slave(struct bonding *bond) 1039 { 1040 struct slave *new_active, *old_active; 1041 struct slave *bestslave = NULL; 1042 int mintime = bond->params.updelay; 1043 int i; 1044 1045 new_active = bond->curr_active_slave; 1046 1047 if (!new_active) { /* there were no active slaves left */ 1048 if (bond->slave_cnt > 0) /* found one slave */ 1049 new_active = bond->first_slave; 1050 else 1051 return NULL; /* still no slave, return NULL */ 1052 } 1053 1054 if ((bond->primary_slave) && 1055 bond->primary_slave->link == BOND_LINK_UP && 1056 bond_should_change_active(bond)) { 1057 new_active = bond->primary_slave; 1058 } 1059 1060 /* remember where to stop iterating over the slaves */ 1061 old_active = new_active; 1062 1063 bond_for_each_slave_from(bond, new_active, i, old_active) { 1064 if (new_active->link == BOND_LINK_UP) { 1065 return new_active; 1066 } else if (new_active->link == BOND_LINK_BACK && 1067 IS_UP(new_active->dev)) { 1068 /* link up, but waiting for stabilization */ 1069 if (new_active->delay < mintime) { 1070 mintime = new_active->delay; 1071 bestslave = new_active; 1072 } 1073 } 1074 } 1075 1076 return bestslave; 1077 } 1078 1079 static bool bond_should_notify_peers(struct bonding *bond) 1080 { 1081 struct slave *slave = bond->curr_active_slave; 1082 1083 pr_debug("bond_should_notify_peers: bond %s slave %s\n", 1084 bond->dev->name, slave ? slave->dev->name : "NULL"); 1085 1086 if (!slave || !bond->send_peer_notif || 1087 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) 1088 return false; 1089 1090 bond->send_peer_notif--; 1091 return true; 1092 } 1093 1094 /** 1095 * change_active_interface - change the active slave into the specified one 1096 * @bond: our bonding struct 1097 * @new: the new slave to make the active one 1098 * 1099 * Set the new slave to the bond's settings and unset them on the old 1100 * curr_active_slave. 1101 * Setting include flags, mc-list, promiscuity, allmulti, etc. 1102 * 1103 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, 1104 * because it is apparently the best available slave we have, even though its 1105 * updelay hasn't timed out yet. 1106 * 1107 * If new_active is not NULL, caller must hold bond->lock for read and 1108 * curr_slave_lock for write_bh. 1109 */ 1110 void bond_change_active_slave(struct bonding *bond, struct slave *new_active) 1111 { 1112 struct slave *old_active = bond->curr_active_slave; 1113 1114 if (old_active == new_active) 1115 return; 1116 1117 if (new_active) { 1118 new_active->jiffies = jiffies; 1119 1120 if (new_active->link == BOND_LINK_BACK) { 1121 if (USES_PRIMARY(bond->params.mode)) { 1122 pr_info("%s: making interface %s the new active one %d ms earlier.\n", 1123 bond->dev->name, new_active->dev->name, 1124 (bond->params.updelay - new_active->delay) * bond->params.miimon); 1125 } 1126 1127 new_active->delay = 0; 1128 new_active->link = BOND_LINK_UP; 1129 1130 if (bond->params.mode == BOND_MODE_8023AD) 1131 bond_3ad_handle_link_change(new_active, BOND_LINK_UP); 1132 1133 if (bond_is_lb(bond)) 1134 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); 1135 } else { 1136 if (USES_PRIMARY(bond->params.mode)) { 1137 pr_info("%s: making interface %s the new active one.\n", 1138 bond->dev->name, new_active->dev->name); 1139 } 1140 } 1141 } 1142 1143 if (USES_PRIMARY(bond->params.mode)) 1144 bond_mc_swap(bond, new_active, old_active); 1145 1146 if (bond_is_lb(bond)) { 1147 bond_alb_handle_active_change(bond, new_active); 1148 if (old_active) 1149 bond_set_slave_inactive_flags(old_active); 1150 if (new_active) 1151 bond_set_slave_active_flags(new_active); 1152 } else { 1153 bond->curr_active_slave = new_active; 1154 } 1155 1156 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) { 1157 if (old_active) 1158 bond_set_slave_inactive_flags(old_active); 1159 1160 if (new_active) { 1161 bool should_notify_peers = false; 1162 1163 bond_set_slave_active_flags(new_active); 1164 1165 if (bond->params.fail_over_mac) 1166 bond_do_fail_over_mac(bond, new_active, 1167 old_active); 1168 1169 if (netif_running(bond->dev)) { 1170 bond->send_peer_notif = 1171 bond->params.num_peer_notif; 1172 should_notify_peers = 1173 bond_should_notify_peers(bond); 1174 } 1175 1176 write_unlock_bh(&bond->curr_slave_lock); 1177 read_unlock(&bond->lock); 1178 1179 netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER); 1180 if (should_notify_peers) 1181 netdev_bonding_change(bond->dev, 1182 NETDEV_NOTIFY_PEERS); 1183 1184 read_lock(&bond->lock); 1185 write_lock_bh(&bond->curr_slave_lock); 1186 } 1187 } 1188 1189 /* resend IGMP joins since active slave has changed or 1190 * all were sent on curr_active_slave. 1191 * resend only if bond is brought up with the affected 1192 * bonding modes and the retransmission is enabled */ 1193 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && 1194 ((USES_PRIMARY(bond->params.mode) && new_active) || 1195 bond->params.mode == BOND_MODE_ROUNDROBIN)) { 1196 bond->igmp_retrans = bond->params.resend_igmp; 1197 queue_delayed_work(bond->wq, &bond->mcast_work, 0); 1198 } 1199 } 1200 1201 /** 1202 * bond_select_active_slave - select a new active slave, if needed 1203 * @bond: our bonding struct 1204 * 1205 * This functions should be called when one of the following occurs: 1206 * - The old curr_active_slave has been released or lost its link. 1207 * - The primary_slave has got its link back. 1208 * - A slave has got its link back and there's no old curr_active_slave. 1209 * 1210 * Caller must hold bond->lock for read and curr_slave_lock for write_bh. 1211 */ 1212 void bond_select_active_slave(struct bonding *bond) 1213 { 1214 struct slave *best_slave; 1215 int rv; 1216 1217 best_slave = bond_find_best_slave(bond); 1218 if (best_slave != bond->curr_active_slave) { 1219 bond_change_active_slave(bond, best_slave); 1220 rv = bond_set_carrier(bond); 1221 if (!rv) 1222 return; 1223 1224 if (netif_carrier_ok(bond->dev)) { 1225 pr_info("%s: first active interface up!\n", 1226 bond->dev->name); 1227 } else { 1228 pr_info("%s: now running without any active interface !\n", 1229 bond->dev->name); 1230 } 1231 } 1232 } 1233 1234 /*--------------------------- slave list handling ---------------------------*/ 1235 1236 /* 1237 * This function attaches the slave to the end of list. 1238 * 1239 * bond->lock held for writing by caller. 1240 */ 1241 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave) 1242 { 1243 if (bond->first_slave == NULL) { /* attaching the first slave */ 1244 new_slave->next = new_slave; 1245 new_slave->prev = new_slave; 1246 bond->first_slave = new_slave; 1247 } else { 1248 new_slave->next = bond->first_slave; 1249 new_slave->prev = bond->first_slave->prev; 1250 new_slave->next->prev = new_slave; 1251 new_slave->prev->next = new_slave; 1252 } 1253 1254 bond->slave_cnt++; 1255 } 1256 1257 /* 1258 * This function detaches the slave from the list. 1259 * WARNING: no check is made to verify if the slave effectively 1260 * belongs to <bond>. 1261 * Nothing is freed on return, structures are just unchained. 1262 * If any slave pointer in bond was pointing to <slave>, 1263 * it should be changed by the calling function. 1264 * 1265 * bond->lock held for writing by caller. 1266 */ 1267 static void bond_detach_slave(struct bonding *bond, struct slave *slave) 1268 { 1269 if (slave->next) 1270 slave->next->prev = slave->prev; 1271 1272 if (slave->prev) 1273 slave->prev->next = slave->next; 1274 1275 if (bond->first_slave == slave) { /* slave is the first slave */ 1276 if (bond->slave_cnt > 1) { /* there are more slave */ 1277 bond->first_slave = slave->next; 1278 } else { 1279 bond->first_slave = NULL; /* slave was the last one */ 1280 } 1281 } 1282 1283 slave->next = NULL; 1284 slave->prev = NULL; 1285 bond->slave_cnt--; 1286 } 1287 1288 #ifdef CONFIG_NET_POLL_CONTROLLER 1289 static inline int slave_enable_netpoll(struct slave *slave) 1290 { 1291 struct netpoll *np; 1292 int err = 0; 1293 1294 np = kzalloc(sizeof(*np), GFP_KERNEL); 1295 err = -ENOMEM; 1296 if (!np) 1297 goto out; 1298 1299 np->dev = slave->dev; 1300 strlcpy(np->dev_name, slave->dev->name, IFNAMSIZ); 1301 err = __netpoll_setup(np); 1302 if (err) { 1303 kfree(np); 1304 goto out; 1305 } 1306 slave->np = np; 1307 out: 1308 return err; 1309 } 1310 static inline void slave_disable_netpoll(struct slave *slave) 1311 { 1312 struct netpoll *np = slave->np; 1313 1314 if (!np) 1315 return; 1316 1317 slave->np = NULL; 1318 synchronize_rcu_bh(); 1319 __netpoll_cleanup(np); 1320 kfree(np); 1321 } 1322 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev) 1323 { 1324 if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL) 1325 return false; 1326 if (!slave_dev->netdev_ops->ndo_poll_controller) 1327 return false; 1328 return true; 1329 } 1330 1331 static void bond_poll_controller(struct net_device *bond_dev) 1332 { 1333 } 1334 1335 static void __bond_netpoll_cleanup(struct bonding *bond) 1336 { 1337 struct slave *slave; 1338 int i; 1339 1340 bond_for_each_slave(bond, slave, i) 1341 if (IS_UP(slave->dev)) 1342 slave_disable_netpoll(slave); 1343 } 1344 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1345 { 1346 struct bonding *bond = netdev_priv(bond_dev); 1347 1348 read_lock(&bond->lock); 1349 __bond_netpoll_cleanup(bond); 1350 read_unlock(&bond->lock); 1351 } 1352 1353 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) 1354 { 1355 struct bonding *bond = netdev_priv(dev); 1356 struct slave *slave; 1357 int i, err = 0; 1358 1359 read_lock(&bond->lock); 1360 bond_for_each_slave(bond, slave, i) { 1361 err = slave_enable_netpoll(slave); 1362 if (err) { 1363 __bond_netpoll_cleanup(bond); 1364 break; 1365 } 1366 } 1367 read_unlock(&bond->lock); 1368 return err; 1369 } 1370 1371 static struct netpoll_info *bond_netpoll_info(struct bonding *bond) 1372 { 1373 return bond->dev->npinfo; 1374 } 1375 1376 #else 1377 static inline int slave_enable_netpoll(struct slave *slave) 1378 { 1379 return 0; 1380 } 1381 static inline void slave_disable_netpoll(struct slave *slave) 1382 { 1383 } 1384 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1385 { 1386 } 1387 #endif 1388 1389 /*---------------------------------- IOCTL ----------------------------------*/ 1390 1391 static int bond_sethwaddr(struct net_device *bond_dev, 1392 struct net_device *slave_dev) 1393 { 1394 pr_debug("bond_dev=%p\n", bond_dev); 1395 pr_debug("slave_dev=%p\n", slave_dev); 1396 pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len); 1397 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len); 1398 return 0; 1399 } 1400 1401 static u32 bond_fix_features(struct net_device *dev, u32 features) 1402 { 1403 struct slave *slave; 1404 struct bonding *bond = netdev_priv(dev); 1405 u32 mask; 1406 int i; 1407 1408 read_lock(&bond->lock); 1409 1410 if (!bond->first_slave) { 1411 /* Disable adding VLANs to empty bond. But why? --mq */ 1412 features |= NETIF_F_VLAN_CHALLENGED; 1413 goto out; 1414 } 1415 1416 mask = features; 1417 features &= ~NETIF_F_ONE_FOR_ALL; 1418 features |= NETIF_F_ALL_FOR_ALL; 1419 1420 bond_for_each_slave(bond, slave, i) { 1421 features = netdev_increment_features(features, 1422 slave->dev->features, 1423 mask); 1424 } 1425 1426 out: 1427 read_unlock(&bond->lock); 1428 return features; 1429 } 1430 1431 #define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \ 1432 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \ 1433 NETIF_F_HIGHDMA | NETIF_F_LRO) 1434 1435 static void bond_compute_features(struct bonding *bond) 1436 { 1437 struct slave *slave; 1438 struct net_device *bond_dev = bond->dev; 1439 u32 vlan_features = BOND_VLAN_FEATURES; 1440 unsigned short max_hard_header_len = ETH_HLEN; 1441 int i; 1442 1443 read_lock(&bond->lock); 1444 1445 if (!bond->first_slave) 1446 goto done; 1447 1448 bond_for_each_slave(bond, slave, i) { 1449 vlan_features = netdev_increment_features(vlan_features, 1450 slave->dev->vlan_features, BOND_VLAN_FEATURES); 1451 1452 if (slave->dev->hard_header_len > max_hard_header_len) 1453 max_hard_header_len = slave->dev->hard_header_len; 1454 } 1455 1456 done: 1457 bond_dev->vlan_features = vlan_features; 1458 bond_dev->hard_header_len = max_hard_header_len; 1459 1460 read_unlock(&bond->lock); 1461 1462 netdev_change_features(bond_dev); 1463 } 1464 1465 static void bond_setup_by_slave(struct net_device *bond_dev, 1466 struct net_device *slave_dev) 1467 { 1468 struct bonding *bond = netdev_priv(bond_dev); 1469 1470 bond_dev->header_ops = slave_dev->header_ops; 1471 1472 bond_dev->type = slave_dev->type; 1473 bond_dev->hard_header_len = slave_dev->hard_header_len; 1474 bond_dev->addr_len = slave_dev->addr_len; 1475 1476 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1477 slave_dev->addr_len); 1478 bond->setup_by_slave = 1; 1479 } 1480 1481 /* On bonding slaves other than the currently active slave, suppress 1482 * duplicates except for alb non-mcast/bcast. 1483 */ 1484 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1485 struct slave *slave, 1486 struct bonding *bond) 1487 { 1488 if (bond_is_slave_inactive(slave)) { 1489 if (bond->params.mode == BOND_MODE_ALB && 1490 skb->pkt_type != PACKET_BROADCAST && 1491 skb->pkt_type != PACKET_MULTICAST) 1492 return false; 1493 return true; 1494 } 1495 return false; 1496 } 1497 1498 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1499 { 1500 struct sk_buff *skb = *pskb; 1501 struct slave *slave; 1502 struct bonding *bond; 1503 1504 skb = skb_share_check(skb, GFP_ATOMIC); 1505 if (unlikely(!skb)) 1506 return RX_HANDLER_CONSUMED; 1507 1508 *pskb = skb; 1509 1510 slave = bond_slave_get_rcu(skb->dev); 1511 bond = slave->bond; 1512 1513 if (bond->params.arp_interval) 1514 slave->dev->last_rx = jiffies; 1515 1516 if (bond->recv_probe) { 1517 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); 1518 1519 if (likely(nskb)) { 1520 bond->recv_probe(nskb, bond, slave); 1521 dev_kfree_skb(nskb); 1522 } 1523 } 1524 1525 if (bond_should_deliver_exact_match(skb, slave, bond)) { 1526 return RX_HANDLER_EXACT; 1527 } 1528 1529 skb->dev = bond->dev; 1530 1531 if (bond->params.mode == BOND_MODE_ALB && 1532 bond->dev->priv_flags & IFF_BRIDGE_PORT && 1533 skb->pkt_type == PACKET_HOST) { 1534 1535 if (unlikely(skb_cow_head(skb, 1536 skb->data - skb_mac_header(skb)))) { 1537 kfree_skb(skb); 1538 return RX_HANDLER_CONSUMED; 1539 } 1540 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN); 1541 } 1542 1543 return RX_HANDLER_ANOTHER; 1544 } 1545 1546 /* enslave device <slave> to bond device <master> */ 1547 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev) 1548 { 1549 struct bonding *bond = netdev_priv(bond_dev); 1550 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1551 struct slave *new_slave = NULL; 1552 struct netdev_hw_addr *ha; 1553 struct sockaddr addr; 1554 int link_reporting; 1555 int res = 0; 1556 1557 if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL && 1558 slave_ops->ndo_do_ioctl == NULL) { 1559 pr_warning("%s: Warning: no link monitoring support for %s\n", 1560 bond_dev->name, slave_dev->name); 1561 } 1562 1563 /* already enslaved */ 1564 if (slave_dev->flags & IFF_SLAVE) { 1565 pr_debug("Error, Device was already enslaved\n"); 1566 return -EBUSY; 1567 } 1568 1569 /* vlan challenged mutual exclusion */ 1570 /* no need to lock since we're protected by rtnl_lock */ 1571 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1572 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name); 1573 if (bond->vlgrp) { 1574 pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n", 1575 bond_dev->name, slave_dev->name, bond_dev->name); 1576 return -EPERM; 1577 } else { 1578 pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n", 1579 bond_dev->name, slave_dev->name, 1580 slave_dev->name, bond_dev->name); 1581 } 1582 } else { 1583 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name); 1584 } 1585 1586 /* 1587 * Old ifenslave binaries are no longer supported. These can 1588 * be identified with moderate accuracy by the state of the slave: 1589 * the current ifenslave will set the interface down prior to 1590 * enslaving it; the old ifenslave will not. 1591 */ 1592 if ((slave_dev->flags & IFF_UP)) { 1593 pr_err("%s is up. This may be due to an out of date ifenslave.\n", 1594 slave_dev->name); 1595 res = -EPERM; 1596 goto err_undo_flags; 1597 } 1598 1599 /* set bonding device ether type by slave - bonding netdevices are 1600 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1601 * there is a need to override some of the type dependent attribs/funcs. 1602 * 1603 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1604 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1605 */ 1606 if (bond->slave_cnt == 0) { 1607 if (bond_dev->type != slave_dev->type) { 1608 pr_debug("%s: change device type from %d to %d\n", 1609 bond_dev->name, 1610 bond_dev->type, slave_dev->type); 1611 1612 res = netdev_bonding_change(bond_dev, 1613 NETDEV_PRE_TYPE_CHANGE); 1614 res = notifier_to_errno(res); 1615 if (res) { 1616 pr_err("%s: refused to change device type\n", 1617 bond_dev->name); 1618 res = -EBUSY; 1619 goto err_undo_flags; 1620 } 1621 1622 /* Flush unicast and multicast addresses */ 1623 dev_uc_flush(bond_dev); 1624 dev_mc_flush(bond_dev); 1625 1626 if (slave_dev->type != ARPHRD_ETHER) 1627 bond_setup_by_slave(bond_dev, slave_dev); 1628 else 1629 ether_setup(bond_dev); 1630 1631 netdev_bonding_change(bond_dev, 1632 NETDEV_POST_TYPE_CHANGE); 1633 } 1634 } else if (bond_dev->type != slave_dev->type) { 1635 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n", 1636 slave_dev->name, 1637 slave_dev->type, bond_dev->type); 1638 res = -EINVAL; 1639 goto err_undo_flags; 1640 } 1641 1642 if (slave_ops->ndo_set_mac_address == NULL) { 1643 if (bond->slave_cnt == 0) { 1644 pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.", 1645 bond_dev->name); 1646 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1647 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1648 pr_err("%s: Error: The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active.\n", 1649 bond_dev->name); 1650 res = -EOPNOTSUPP; 1651 goto err_undo_flags; 1652 } 1653 } 1654 1655 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1656 1657 /* If this is the first slave, then we need to set the master's hardware 1658 * address to be the same as the slave's. */ 1659 if (is_zero_ether_addr(bond->dev->dev_addr)) 1660 memcpy(bond->dev->dev_addr, slave_dev->dev_addr, 1661 slave_dev->addr_len); 1662 1663 1664 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL); 1665 if (!new_slave) { 1666 res = -ENOMEM; 1667 goto err_undo_flags; 1668 } 1669 1670 /* 1671 * Set the new_slave's queue_id to be zero. Queue ID mapping 1672 * is set via sysfs or module option if desired. 1673 */ 1674 new_slave->queue_id = 0; 1675 1676 /* Save slave's original mtu and then set it to match the bond */ 1677 new_slave->original_mtu = slave_dev->mtu; 1678 res = dev_set_mtu(slave_dev, bond->dev->mtu); 1679 if (res) { 1680 pr_debug("Error %d calling dev_set_mtu\n", res); 1681 goto err_free; 1682 } 1683 1684 /* 1685 * Save slave's original ("permanent") mac address for modes 1686 * that need it, and for restoring it upon release, and then 1687 * set it to the master's address 1688 */ 1689 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN); 1690 1691 if (!bond->params.fail_over_mac) { 1692 /* 1693 * Set slave to master's mac address. The application already 1694 * set the master's mac address to that of the first slave 1695 */ 1696 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 1697 addr.sa_family = slave_dev->type; 1698 res = dev_set_mac_address(slave_dev, &addr); 1699 if (res) { 1700 pr_debug("Error %d calling set_mac_address\n", res); 1701 goto err_restore_mtu; 1702 } 1703 } 1704 1705 res = netdev_set_bond_master(slave_dev, bond_dev); 1706 if (res) { 1707 pr_debug("Error %d calling netdev_set_bond_master\n", res); 1708 goto err_restore_mac; 1709 } 1710 1711 /* open the slave since the application closed it */ 1712 res = dev_open(slave_dev); 1713 if (res) { 1714 pr_debug("Opening slave %s failed\n", slave_dev->name); 1715 goto err_unset_master; 1716 } 1717 1718 new_slave->bond = bond; 1719 new_slave->dev = slave_dev; 1720 slave_dev->priv_flags |= IFF_BONDING; 1721 1722 if (bond_is_lb(bond)) { 1723 /* bond_alb_init_slave() must be called before all other stages since 1724 * it might fail and we do not want to have to undo everything 1725 */ 1726 res = bond_alb_init_slave(bond, new_slave); 1727 if (res) 1728 goto err_close; 1729 } 1730 1731 /* If the mode USES_PRIMARY, then the new slave gets the 1732 * master's promisc (and mc) settings only if it becomes the 1733 * curr_active_slave, and that is taken care of later when calling 1734 * bond_change_active() 1735 */ 1736 if (!USES_PRIMARY(bond->params.mode)) { 1737 /* set promiscuity level to new slave */ 1738 if (bond_dev->flags & IFF_PROMISC) { 1739 res = dev_set_promiscuity(slave_dev, 1); 1740 if (res) 1741 goto err_close; 1742 } 1743 1744 /* set allmulti level to new slave */ 1745 if (bond_dev->flags & IFF_ALLMULTI) { 1746 res = dev_set_allmulti(slave_dev, 1); 1747 if (res) 1748 goto err_close; 1749 } 1750 1751 netif_addr_lock_bh(bond_dev); 1752 /* upload master's mc_list to new slave */ 1753 netdev_for_each_mc_addr(ha, bond_dev) 1754 dev_mc_add(slave_dev, ha->addr); 1755 netif_addr_unlock_bh(bond_dev); 1756 } 1757 1758 if (bond->params.mode == BOND_MODE_8023AD) { 1759 /* add lacpdu mc addr to mc list */ 1760 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 1761 1762 dev_mc_add(slave_dev, lacpdu_multicast); 1763 } 1764 1765 bond_add_vlans_on_slave(bond, slave_dev); 1766 1767 write_lock_bh(&bond->lock); 1768 1769 bond_attach_slave(bond, new_slave); 1770 1771 new_slave->delay = 0; 1772 new_slave->link_failure_count = 0; 1773 1774 write_unlock_bh(&bond->lock); 1775 1776 bond_compute_features(bond); 1777 1778 read_lock(&bond->lock); 1779 1780 new_slave->last_arp_rx = jiffies; 1781 1782 if (bond->params.miimon && !bond->params.use_carrier) { 1783 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 1784 1785 if ((link_reporting == -1) && !bond->params.arp_interval) { 1786 /* 1787 * miimon is set but a bonded network driver 1788 * does not support ETHTOOL/MII and 1789 * arp_interval is not set. Note: if 1790 * use_carrier is enabled, we will never go 1791 * here (because netif_carrier is always 1792 * supported); thus, we don't need to change 1793 * the messages for netif_carrier. 1794 */ 1795 pr_warning("%s: Warning: 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", 1796 bond_dev->name, slave_dev->name); 1797 } else if (link_reporting == -1) { 1798 /* unable get link status using mii/ethtool */ 1799 pr_warning("%s: Warning: 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", 1800 bond_dev->name, slave_dev->name); 1801 } 1802 } 1803 1804 /* check for initial state */ 1805 if (!bond->params.miimon || 1806 (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) { 1807 if (bond->params.updelay) { 1808 pr_debug("Initial state of slave_dev is BOND_LINK_BACK\n"); 1809 new_slave->link = BOND_LINK_BACK; 1810 new_slave->delay = bond->params.updelay; 1811 } else { 1812 pr_debug("Initial state of slave_dev is BOND_LINK_UP\n"); 1813 new_slave->link = BOND_LINK_UP; 1814 } 1815 new_slave->jiffies = jiffies; 1816 } else { 1817 pr_debug("Initial state of slave_dev is BOND_LINK_DOWN\n"); 1818 new_slave->link = BOND_LINK_DOWN; 1819 } 1820 1821 if (bond_update_speed_duplex(new_slave) && 1822 (new_slave->link != BOND_LINK_DOWN)) { 1823 pr_warning("%s: Warning: failed to get speed and duplex from %s, assumed to be 100Mb/sec and Full.\n", 1824 bond_dev->name, new_slave->dev->name); 1825 1826 if (bond->params.mode == BOND_MODE_8023AD) { 1827 pr_warning("%s: Warning: Operation of 802.3ad mode requires ETHTOOL support in base driver for proper aggregator selection.\n", 1828 bond_dev->name); 1829 } 1830 } 1831 1832 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) { 1833 /* if there is a primary slave, remember it */ 1834 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 1835 bond->primary_slave = new_slave; 1836 bond->force_primary = true; 1837 } 1838 } 1839 1840 write_lock_bh(&bond->curr_slave_lock); 1841 1842 switch (bond->params.mode) { 1843 case BOND_MODE_ACTIVEBACKUP: 1844 bond_set_slave_inactive_flags(new_slave); 1845 bond_select_active_slave(bond); 1846 break; 1847 case BOND_MODE_8023AD: 1848 /* in 802.3ad mode, the internal mechanism 1849 * will activate the slaves in the selected 1850 * aggregator 1851 */ 1852 bond_set_slave_inactive_flags(new_slave); 1853 /* if this is the first slave */ 1854 if (bond->slave_cnt == 1) { 1855 SLAVE_AD_INFO(new_slave).id = 1; 1856 /* Initialize AD with the number of times that the AD timer is called in 1 second 1857 * can be called only after the mac address of the bond is set 1858 */ 1859 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL, 1860 bond->params.lacp_fast); 1861 } else { 1862 SLAVE_AD_INFO(new_slave).id = 1863 SLAVE_AD_INFO(new_slave->prev).id + 1; 1864 } 1865 1866 bond_3ad_bind_slave(new_slave); 1867 break; 1868 case BOND_MODE_TLB: 1869 case BOND_MODE_ALB: 1870 bond_set_active_slave(new_slave); 1871 bond_set_slave_inactive_flags(new_slave); 1872 bond_select_active_slave(bond); 1873 break; 1874 default: 1875 pr_debug("This slave is always active in trunk mode\n"); 1876 1877 /* always active in trunk mode */ 1878 bond_set_active_slave(new_slave); 1879 1880 /* In trunking mode there is little meaning to curr_active_slave 1881 * anyway (it holds no special properties of the bond device), 1882 * so we can change it without calling change_active_interface() 1883 */ 1884 if (!bond->curr_active_slave) 1885 bond->curr_active_slave = new_slave; 1886 1887 break; 1888 } /* switch(bond_mode) */ 1889 1890 write_unlock_bh(&bond->curr_slave_lock); 1891 1892 bond_set_carrier(bond); 1893 1894 #ifdef CONFIG_NET_POLL_CONTROLLER 1895 slave_dev->npinfo = bond_netpoll_info(bond); 1896 if (slave_dev->npinfo) { 1897 if (slave_enable_netpoll(new_slave)) { 1898 read_unlock(&bond->lock); 1899 pr_info("Error, %s: master_dev is using netpoll, " 1900 "but new slave device does not support netpoll.\n", 1901 bond_dev->name); 1902 res = -EBUSY; 1903 goto err_close; 1904 } 1905 } 1906 #endif 1907 1908 read_unlock(&bond->lock); 1909 1910 res = bond_create_slave_symlinks(bond_dev, slave_dev); 1911 if (res) 1912 goto err_close; 1913 1914 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 1915 new_slave); 1916 if (res) { 1917 pr_debug("Error %d calling netdev_rx_handler_register\n", res); 1918 goto err_dest_symlinks; 1919 } 1920 1921 pr_info("%s: enslaving %s as a%s interface with a%s link.\n", 1922 bond_dev->name, slave_dev->name, 1923 bond_is_active_slave(new_slave) ? "n active" : " backup", 1924 new_slave->link != BOND_LINK_DOWN ? "n up" : " down"); 1925 1926 /* enslave is successful */ 1927 return 0; 1928 1929 /* Undo stages on error */ 1930 err_dest_symlinks: 1931 bond_destroy_slave_symlinks(bond_dev, slave_dev); 1932 1933 err_close: 1934 dev_close(slave_dev); 1935 1936 err_unset_master: 1937 netdev_set_bond_master(slave_dev, NULL); 1938 1939 err_restore_mac: 1940 if (!bond->params.fail_over_mac) { 1941 /* XXX TODO - fom follow mode needs to change master's 1942 * MAC if this slave's MAC is in use by the bond, or at 1943 * least print a warning. 1944 */ 1945 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN); 1946 addr.sa_family = slave_dev->type; 1947 dev_set_mac_address(slave_dev, &addr); 1948 } 1949 1950 err_restore_mtu: 1951 dev_set_mtu(slave_dev, new_slave->original_mtu); 1952 1953 err_free: 1954 kfree(new_slave); 1955 1956 err_undo_flags: 1957 bond_compute_features(bond); 1958 1959 return res; 1960 } 1961 1962 /* 1963 * Try to release the slave device <slave> from the bond device <master> 1964 * It is legal to access curr_active_slave without a lock because all the function 1965 * is write-locked. 1966 * 1967 * The rules for slave state should be: 1968 * for Active/Backup: 1969 * Active stays on all backups go down 1970 * for Bonded connections: 1971 * The first up interface should be left on and all others downed. 1972 */ 1973 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 1974 { 1975 struct bonding *bond = netdev_priv(bond_dev); 1976 struct slave *slave, *oldcurrent; 1977 struct sockaddr addr; 1978 u32 old_features = bond_dev->features; 1979 1980 /* slave is not a slave or master is not master of this slave */ 1981 if (!(slave_dev->flags & IFF_SLAVE) || 1982 (slave_dev->master != bond_dev)) { 1983 pr_err("%s: Error: cannot release %s.\n", 1984 bond_dev->name, slave_dev->name); 1985 return -EINVAL; 1986 } 1987 1988 block_netpoll_tx(); 1989 netdev_bonding_change(bond_dev, NETDEV_RELEASE); 1990 write_lock_bh(&bond->lock); 1991 1992 slave = bond_get_slave_by_dev(bond, slave_dev); 1993 if (!slave) { 1994 /* not a slave of this bond */ 1995 pr_info("%s: %s not enslaved\n", 1996 bond_dev->name, slave_dev->name); 1997 write_unlock_bh(&bond->lock); 1998 unblock_netpoll_tx(); 1999 return -EINVAL; 2000 } 2001 2002 /* unregister rx_handler early so bond_handle_frame wouldn't be called 2003 * for this slave anymore. 2004 */ 2005 netdev_rx_handler_unregister(slave_dev); 2006 write_unlock_bh(&bond->lock); 2007 synchronize_net(); 2008 write_lock_bh(&bond->lock); 2009 2010 if (!bond->params.fail_over_mac) { 2011 if (!compare_ether_addr(bond_dev->dev_addr, slave->perm_hwaddr) && 2012 bond->slave_cnt > 1) 2013 pr_warning("%s: Warning: 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", 2014 bond_dev->name, slave_dev->name, 2015 slave->perm_hwaddr, 2016 bond_dev->name, slave_dev->name); 2017 } 2018 2019 /* Inform AD package of unbinding of slave. */ 2020 if (bond->params.mode == BOND_MODE_8023AD) { 2021 /* must be called before the slave is 2022 * detached from the list 2023 */ 2024 bond_3ad_unbind_slave(slave); 2025 } 2026 2027 pr_info("%s: releasing %s interface %s\n", 2028 bond_dev->name, 2029 bond_is_active_slave(slave) ? "active" : "backup", 2030 slave_dev->name); 2031 2032 oldcurrent = bond->curr_active_slave; 2033 2034 bond->current_arp_slave = NULL; 2035 2036 /* release the slave from its bond */ 2037 bond_detach_slave(bond, slave); 2038 2039 if (bond->primary_slave == slave) 2040 bond->primary_slave = NULL; 2041 2042 if (oldcurrent == slave) 2043 bond_change_active_slave(bond, NULL); 2044 2045 if (bond_is_lb(bond)) { 2046 /* Must be called only after the slave has been 2047 * detached from the list and the curr_active_slave 2048 * has been cleared (if our_slave == old_current), 2049 * but before a new active slave is selected. 2050 */ 2051 write_unlock_bh(&bond->lock); 2052 bond_alb_deinit_slave(bond, slave); 2053 write_lock_bh(&bond->lock); 2054 } 2055 2056 if (oldcurrent == slave) { 2057 /* 2058 * Note that we hold RTNL over this sequence, so there 2059 * is no concern that another slave add/remove event 2060 * will interfere. 2061 */ 2062 write_unlock_bh(&bond->lock); 2063 read_lock(&bond->lock); 2064 write_lock_bh(&bond->curr_slave_lock); 2065 2066 bond_select_active_slave(bond); 2067 2068 write_unlock_bh(&bond->curr_slave_lock); 2069 read_unlock(&bond->lock); 2070 write_lock_bh(&bond->lock); 2071 } 2072 2073 if (bond->slave_cnt == 0) { 2074 bond_set_carrier(bond); 2075 2076 /* if the last slave was removed, zero the mac address 2077 * of the master so it will be set by the application 2078 * to the mac address of the first slave 2079 */ 2080 memset(bond_dev->dev_addr, 0, bond_dev->addr_len); 2081 2082 if (bond->vlgrp) { 2083 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n", 2084 bond_dev->name, bond_dev->name); 2085 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n", 2086 bond_dev->name); 2087 } 2088 } 2089 2090 write_unlock_bh(&bond->lock); 2091 unblock_netpoll_tx(); 2092 2093 bond_compute_features(bond); 2094 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 2095 (old_features & NETIF_F_VLAN_CHALLENGED)) 2096 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n", 2097 bond_dev->name, slave_dev->name, bond_dev->name); 2098 2099 /* must do this from outside any spinlocks */ 2100 bond_destroy_slave_symlinks(bond_dev, slave_dev); 2101 2102 bond_del_vlans_from_slave(bond, slave_dev); 2103 2104 /* If the mode USES_PRIMARY, then we should only remove its 2105 * promisc and mc settings if it was the curr_active_slave, but that was 2106 * already taken care of above when we detached the slave 2107 */ 2108 if (!USES_PRIMARY(bond->params.mode)) { 2109 /* unset promiscuity level from slave */ 2110 if (bond_dev->flags & IFF_PROMISC) 2111 dev_set_promiscuity(slave_dev, -1); 2112 2113 /* unset allmulti level from slave */ 2114 if (bond_dev->flags & IFF_ALLMULTI) 2115 dev_set_allmulti(slave_dev, -1); 2116 2117 /* flush master's mc_list from slave */ 2118 netif_addr_lock_bh(bond_dev); 2119 bond_mc_list_flush(bond_dev, slave_dev); 2120 netif_addr_unlock_bh(bond_dev); 2121 } 2122 2123 netdev_set_bond_master(slave_dev, NULL); 2124 2125 slave_disable_netpoll(slave); 2126 2127 /* close slave before restoring its mac address */ 2128 dev_close(slave_dev); 2129 2130 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 2131 /* restore original ("permanent") mac address */ 2132 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN); 2133 addr.sa_family = slave_dev->type; 2134 dev_set_mac_address(slave_dev, &addr); 2135 } 2136 2137 dev_set_mtu(slave_dev, slave->original_mtu); 2138 2139 slave_dev->priv_flags &= ~IFF_BONDING; 2140 2141 kfree(slave); 2142 2143 return 0; /* deletion OK */ 2144 } 2145 2146 /* 2147 * First release a slave and then destroy the bond if no more slaves are left. 2148 * Must be under rtnl_lock when this function is called. 2149 */ 2150 static int bond_release_and_destroy(struct net_device *bond_dev, 2151 struct net_device *slave_dev) 2152 { 2153 struct bonding *bond = netdev_priv(bond_dev); 2154 int ret; 2155 2156 ret = bond_release(bond_dev, slave_dev); 2157 if ((ret == 0) && (bond->slave_cnt == 0)) { 2158 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 2159 pr_info("%s: destroying bond %s.\n", 2160 bond_dev->name, bond_dev->name); 2161 unregister_netdevice(bond_dev); 2162 } 2163 return ret; 2164 } 2165 2166 /* 2167 * This function releases all slaves. 2168 */ 2169 static int bond_release_all(struct net_device *bond_dev) 2170 { 2171 struct bonding *bond = netdev_priv(bond_dev); 2172 struct slave *slave; 2173 struct net_device *slave_dev; 2174 struct sockaddr addr; 2175 2176 write_lock_bh(&bond->lock); 2177 2178 netif_carrier_off(bond_dev); 2179 2180 if (bond->slave_cnt == 0) 2181 goto out; 2182 2183 bond->current_arp_slave = NULL; 2184 bond->primary_slave = NULL; 2185 bond_change_active_slave(bond, NULL); 2186 2187 while ((slave = bond->first_slave) != NULL) { 2188 /* Inform AD package of unbinding of slave 2189 * before slave is detached from the list. 2190 */ 2191 if (bond->params.mode == BOND_MODE_8023AD) 2192 bond_3ad_unbind_slave(slave); 2193 2194 slave_dev = slave->dev; 2195 bond_detach_slave(bond, slave); 2196 2197 /* now that the slave is detached, unlock and perform 2198 * all the undo steps that should not be called from 2199 * within a lock. 2200 */ 2201 write_unlock_bh(&bond->lock); 2202 2203 /* unregister rx_handler early so bond_handle_frame wouldn't 2204 * be called for this slave anymore. 2205 */ 2206 netdev_rx_handler_unregister(slave_dev); 2207 synchronize_net(); 2208 2209 if (bond_is_lb(bond)) { 2210 /* must be called only after the slave 2211 * has been detached from the list 2212 */ 2213 bond_alb_deinit_slave(bond, slave); 2214 } 2215 2216 bond_destroy_slave_symlinks(bond_dev, slave_dev); 2217 bond_del_vlans_from_slave(bond, slave_dev); 2218 2219 /* If the mode USES_PRIMARY, then we should only remove its 2220 * promisc and mc settings if it was the curr_active_slave, but that was 2221 * already taken care of above when we detached the slave 2222 */ 2223 if (!USES_PRIMARY(bond->params.mode)) { 2224 /* unset promiscuity level from slave */ 2225 if (bond_dev->flags & IFF_PROMISC) 2226 dev_set_promiscuity(slave_dev, -1); 2227 2228 /* unset allmulti level from slave */ 2229 if (bond_dev->flags & IFF_ALLMULTI) 2230 dev_set_allmulti(slave_dev, -1); 2231 2232 /* flush master's mc_list from slave */ 2233 netif_addr_lock_bh(bond_dev); 2234 bond_mc_list_flush(bond_dev, slave_dev); 2235 netif_addr_unlock_bh(bond_dev); 2236 } 2237 2238 netdev_set_bond_master(slave_dev, NULL); 2239 2240 slave_disable_netpoll(slave); 2241 2242 /* close slave before restoring its mac address */ 2243 dev_close(slave_dev); 2244 2245 if (!bond->params.fail_over_mac) { 2246 /* restore original ("permanent") mac address*/ 2247 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN); 2248 addr.sa_family = slave_dev->type; 2249 dev_set_mac_address(slave_dev, &addr); 2250 } 2251 2252 kfree(slave); 2253 2254 /* re-acquire the lock before getting the next slave */ 2255 write_lock_bh(&bond->lock); 2256 } 2257 2258 /* zero the mac address of the master so it will be 2259 * set by the application to the mac address of the 2260 * first slave 2261 */ 2262 memset(bond_dev->dev_addr, 0, bond_dev->addr_len); 2263 2264 if (bond->vlgrp) { 2265 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n", 2266 bond_dev->name, bond_dev->name); 2267 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n", 2268 bond_dev->name); 2269 } 2270 2271 pr_info("%s: released all slaves\n", bond_dev->name); 2272 2273 out: 2274 write_unlock_bh(&bond->lock); 2275 2276 bond_compute_features(bond); 2277 2278 return 0; 2279 } 2280 2281 /* 2282 * This function changes the active slave to slave <slave_dev>. 2283 * It returns -EINVAL in the following cases. 2284 * - <slave_dev> is not found in the list. 2285 * - There is not active slave now. 2286 * - <slave_dev> is already active. 2287 * - The link state of <slave_dev> is not BOND_LINK_UP. 2288 * - <slave_dev> is not running. 2289 * In these cases, this function does nothing. 2290 * In the other cases, current_slave pointer is changed and 0 is returned. 2291 */ 2292 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev) 2293 { 2294 struct bonding *bond = netdev_priv(bond_dev); 2295 struct slave *old_active = NULL; 2296 struct slave *new_active = NULL; 2297 int res = 0; 2298 2299 if (!USES_PRIMARY(bond->params.mode)) 2300 return -EINVAL; 2301 2302 /* Verify that master_dev is indeed the master of slave_dev */ 2303 if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev)) 2304 return -EINVAL; 2305 2306 read_lock(&bond->lock); 2307 2308 read_lock(&bond->curr_slave_lock); 2309 old_active = bond->curr_active_slave; 2310 read_unlock(&bond->curr_slave_lock); 2311 2312 new_active = bond_get_slave_by_dev(bond, slave_dev); 2313 2314 /* 2315 * Changing to the current active: do nothing; return success. 2316 */ 2317 if (new_active && (new_active == old_active)) { 2318 read_unlock(&bond->lock); 2319 return 0; 2320 } 2321 2322 if ((new_active) && 2323 (old_active) && 2324 (new_active->link == BOND_LINK_UP) && 2325 IS_UP(new_active->dev)) { 2326 block_netpoll_tx(); 2327 write_lock_bh(&bond->curr_slave_lock); 2328 bond_change_active_slave(bond, new_active); 2329 write_unlock_bh(&bond->curr_slave_lock); 2330 unblock_netpoll_tx(); 2331 } else 2332 res = -EINVAL; 2333 2334 read_unlock(&bond->lock); 2335 2336 return res; 2337 } 2338 2339 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info) 2340 { 2341 struct bonding *bond = netdev_priv(bond_dev); 2342 2343 info->bond_mode = bond->params.mode; 2344 info->miimon = bond->params.miimon; 2345 2346 read_lock(&bond->lock); 2347 info->num_slaves = bond->slave_cnt; 2348 read_unlock(&bond->lock); 2349 2350 return 0; 2351 } 2352 2353 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 2354 { 2355 struct bonding *bond = netdev_priv(bond_dev); 2356 struct slave *slave; 2357 int i, res = -ENODEV; 2358 2359 read_lock(&bond->lock); 2360 2361 bond_for_each_slave(bond, slave, i) { 2362 if (i == (int)info->slave_id) { 2363 res = 0; 2364 strcpy(info->slave_name, slave->dev->name); 2365 info->link = slave->link; 2366 info->state = bond_slave_state(slave); 2367 info->link_failure_count = slave->link_failure_count; 2368 break; 2369 } 2370 } 2371 2372 read_unlock(&bond->lock); 2373 2374 return res; 2375 } 2376 2377 /*-------------------------------- Monitoring -------------------------------*/ 2378 2379 2380 static int bond_miimon_inspect(struct bonding *bond) 2381 { 2382 struct slave *slave; 2383 int i, link_state, commit = 0; 2384 bool ignore_updelay; 2385 2386 ignore_updelay = !bond->curr_active_slave ? true : false; 2387 2388 bond_for_each_slave(bond, slave, i) { 2389 slave->new_link = BOND_LINK_NOCHANGE; 2390 2391 link_state = bond_check_dev_link(bond, slave->dev, 0); 2392 2393 switch (slave->link) { 2394 case BOND_LINK_UP: 2395 if (link_state) 2396 continue; 2397 2398 slave->link = BOND_LINK_FAIL; 2399 slave->delay = bond->params.downdelay; 2400 if (slave->delay) { 2401 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n", 2402 bond->dev->name, 2403 (bond->params.mode == 2404 BOND_MODE_ACTIVEBACKUP) ? 2405 (bond_is_active_slave(slave) ? 2406 "active " : "backup ") : "", 2407 slave->dev->name, 2408 bond->params.downdelay * bond->params.miimon); 2409 } 2410 /*FALLTHRU*/ 2411 case BOND_LINK_FAIL: 2412 if (link_state) { 2413 /* 2414 * recovered before downdelay expired 2415 */ 2416 slave->link = BOND_LINK_UP; 2417 slave->jiffies = jiffies; 2418 pr_info("%s: link status up again after %d ms for interface %s.\n", 2419 bond->dev->name, 2420 (bond->params.downdelay - slave->delay) * 2421 bond->params.miimon, 2422 slave->dev->name); 2423 continue; 2424 } 2425 2426 if (slave->delay <= 0) { 2427 slave->new_link = BOND_LINK_DOWN; 2428 commit++; 2429 continue; 2430 } 2431 2432 slave->delay--; 2433 break; 2434 2435 case BOND_LINK_DOWN: 2436 if (!link_state) 2437 continue; 2438 2439 slave->link = BOND_LINK_BACK; 2440 slave->delay = bond->params.updelay; 2441 2442 if (slave->delay) { 2443 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n", 2444 bond->dev->name, slave->dev->name, 2445 ignore_updelay ? 0 : 2446 bond->params.updelay * 2447 bond->params.miimon); 2448 } 2449 /*FALLTHRU*/ 2450 case BOND_LINK_BACK: 2451 if (!link_state) { 2452 slave->link = BOND_LINK_DOWN; 2453 pr_info("%s: link status down again after %d ms for interface %s.\n", 2454 bond->dev->name, 2455 (bond->params.updelay - slave->delay) * 2456 bond->params.miimon, 2457 slave->dev->name); 2458 2459 continue; 2460 } 2461 2462 if (ignore_updelay) 2463 slave->delay = 0; 2464 2465 if (slave->delay <= 0) { 2466 slave->new_link = BOND_LINK_UP; 2467 commit++; 2468 ignore_updelay = false; 2469 continue; 2470 } 2471 2472 slave->delay--; 2473 break; 2474 } 2475 } 2476 2477 return commit; 2478 } 2479 2480 static void bond_miimon_commit(struct bonding *bond) 2481 { 2482 struct slave *slave; 2483 int i; 2484 2485 bond_for_each_slave(bond, slave, i) { 2486 switch (slave->new_link) { 2487 case BOND_LINK_NOCHANGE: 2488 continue; 2489 2490 case BOND_LINK_UP: 2491 slave->link = BOND_LINK_UP; 2492 slave->jiffies = jiffies; 2493 2494 if (bond->params.mode == BOND_MODE_8023AD) { 2495 /* prevent it from being the active one */ 2496 bond_set_backup_slave(slave); 2497 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) { 2498 /* make it immediately active */ 2499 bond_set_active_slave(slave); 2500 } else if (slave != bond->primary_slave) { 2501 /* prevent it from being the active one */ 2502 bond_set_backup_slave(slave); 2503 } 2504 2505 bond_update_speed_duplex(slave); 2506 2507 pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n", 2508 bond->dev->name, slave->dev->name, 2509 slave->speed, slave->duplex ? "full" : "half"); 2510 2511 /* notify ad that the link status has changed */ 2512 if (bond->params.mode == BOND_MODE_8023AD) 2513 bond_3ad_handle_link_change(slave, BOND_LINK_UP); 2514 2515 if (bond_is_lb(bond)) 2516 bond_alb_handle_link_change(bond, slave, 2517 BOND_LINK_UP); 2518 2519 if (!bond->curr_active_slave || 2520 (slave == bond->primary_slave)) 2521 goto do_failover; 2522 2523 continue; 2524 2525 case BOND_LINK_DOWN: 2526 if (slave->link_failure_count < UINT_MAX) 2527 slave->link_failure_count++; 2528 2529 slave->link = BOND_LINK_DOWN; 2530 2531 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP || 2532 bond->params.mode == BOND_MODE_8023AD) 2533 bond_set_slave_inactive_flags(slave); 2534 2535 pr_info("%s: link status definitely down for interface %s, disabling it\n", 2536 bond->dev->name, slave->dev->name); 2537 2538 if (bond->params.mode == BOND_MODE_8023AD) 2539 bond_3ad_handle_link_change(slave, 2540 BOND_LINK_DOWN); 2541 2542 if (bond_is_lb(bond)) 2543 bond_alb_handle_link_change(bond, slave, 2544 BOND_LINK_DOWN); 2545 2546 if (slave == bond->curr_active_slave) 2547 goto do_failover; 2548 2549 continue; 2550 2551 default: 2552 pr_err("%s: invalid new link %d on slave %s\n", 2553 bond->dev->name, slave->new_link, 2554 slave->dev->name); 2555 slave->new_link = BOND_LINK_NOCHANGE; 2556 2557 continue; 2558 } 2559 2560 do_failover: 2561 ASSERT_RTNL(); 2562 block_netpoll_tx(); 2563 write_lock_bh(&bond->curr_slave_lock); 2564 bond_select_active_slave(bond); 2565 write_unlock_bh(&bond->curr_slave_lock); 2566 unblock_netpoll_tx(); 2567 } 2568 2569 bond_set_carrier(bond); 2570 } 2571 2572 /* 2573 * bond_mii_monitor 2574 * 2575 * Really a wrapper that splits the mii monitor into two phases: an 2576 * inspection, then (if inspection indicates something needs to be done) 2577 * an acquisition of appropriate locks followed by a commit phase to 2578 * implement whatever link state changes are indicated. 2579 */ 2580 void bond_mii_monitor(struct work_struct *work) 2581 { 2582 struct bonding *bond = container_of(work, struct bonding, 2583 mii_work.work); 2584 bool should_notify_peers = false; 2585 2586 read_lock(&bond->lock); 2587 if (bond->kill_timers) 2588 goto out; 2589 2590 if (bond->slave_cnt == 0) 2591 goto re_arm; 2592 2593 should_notify_peers = bond_should_notify_peers(bond); 2594 2595 if (bond_miimon_inspect(bond)) { 2596 read_unlock(&bond->lock); 2597 rtnl_lock(); 2598 read_lock(&bond->lock); 2599 2600 bond_miimon_commit(bond); 2601 2602 read_unlock(&bond->lock); 2603 rtnl_unlock(); /* might sleep, hold no other locks */ 2604 read_lock(&bond->lock); 2605 } 2606 2607 re_arm: 2608 if (bond->params.miimon) 2609 queue_delayed_work(bond->wq, &bond->mii_work, 2610 msecs_to_jiffies(bond->params.miimon)); 2611 out: 2612 read_unlock(&bond->lock); 2613 2614 if (should_notify_peers) { 2615 rtnl_lock(); 2616 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS); 2617 rtnl_unlock(); 2618 } 2619 } 2620 2621 static __be32 bond_glean_dev_ip(struct net_device *dev) 2622 { 2623 struct in_device *idev; 2624 struct in_ifaddr *ifa; 2625 __be32 addr = 0; 2626 2627 if (!dev) 2628 return 0; 2629 2630 rcu_read_lock(); 2631 idev = __in_dev_get_rcu(dev); 2632 if (!idev) 2633 goto out; 2634 2635 ifa = idev->ifa_list; 2636 if (!ifa) 2637 goto out; 2638 2639 addr = ifa->ifa_local; 2640 out: 2641 rcu_read_unlock(); 2642 return addr; 2643 } 2644 2645 static int bond_has_this_ip(struct bonding *bond, __be32 ip) 2646 { 2647 struct vlan_entry *vlan; 2648 2649 if (ip == bond->master_ip) 2650 return 1; 2651 2652 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 2653 if (ip == vlan->vlan_ip) 2654 return 1; 2655 } 2656 2657 return 0; 2658 } 2659 2660 /* 2661 * We go to the (large) trouble of VLAN tagging ARP frames because 2662 * switches in VLAN mode (especially if ports are configured as 2663 * "native" to a VLAN) might not pass non-tagged frames. 2664 */ 2665 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id) 2666 { 2667 struct sk_buff *skb; 2668 2669 pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op, 2670 slave_dev->name, dest_ip, src_ip, vlan_id); 2671 2672 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2673 NULL, slave_dev->dev_addr, NULL); 2674 2675 if (!skb) { 2676 pr_err("ARP packet allocation failed\n"); 2677 return; 2678 } 2679 if (vlan_id) { 2680 skb = vlan_put_tag(skb, vlan_id); 2681 if (!skb) { 2682 pr_err("failed to insert VLAN tag\n"); 2683 return; 2684 } 2685 } 2686 arp_xmit(skb); 2687 } 2688 2689 2690 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2691 { 2692 int i, vlan_id; 2693 __be32 *targets = bond->params.arp_targets; 2694 struct vlan_entry *vlan; 2695 struct net_device *vlan_dev; 2696 struct rtable *rt; 2697 2698 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) { 2699 if (!targets[i]) 2700 break; 2701 pr_debug("basa: target %x\n", targets[i]); 2702 if (!bond->vlgrp) { 2703 pr_debug("basa: empty vlan: arp_send\n"); 2704 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2705 bond->master_ip, 0); 2706 continue; 2707 } 2708 2709 /* 2710 * If VLANs are configured, we do a route lookup to 2711 * determine which VLAN interface would be used, so we 2712 * can tag the ARP with the proper VLAN tag. 2713 */ 2714 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 2715 RTO_ONLINK, 0); 2716 if (IS_ERR(rt)) { 2717 if (net_ratelimit()) { 2718 pr_warning("%s: no route to arp_ip_target %pI4\n", 2719 bond->dev->name, &targets[i]); 2720 } 2721 continue; 2722 } 2723 2724 /* 2725 * This target is not on a VLAN 2726 */ 2727 if (rt->dst.dev == bond->dev) { 2728 ip_rt_put(rt); 2729 pr_debug("basa: rtdev == bond->dev: arp_send\n"); 2730 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2731 bond->master_ip, 0); 2732 continue; 2733 } 2734 2735 vlan_id = 0; 2736 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 2737 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id); 2738 if (vlan_dev == rt->dst.dev) { 2739 vlan_id = vlan->vlan_id; 2740 pr_debug("basa: vlan match on %s %d\n", 2741 vlan_dev->name, vlan_id); 2742 break; 2743 } 2744 } 2745 2746 if (vlan_id) { 2747 ip_rt_put(rt); 2748 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2749 vlan->vlan_ip, vlan_id); 2750 continue; 2751 } 2752 2753 if (net_ratelimit()) { 2754 pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n", 2755 bond->dev->name, &targets[i], 2756 rt->dst.dev ? rt->dst.dev->name : "NULL"); 2757 } 2758 ip_rt_put(rt); 2759 } 2760 } 2761 2762 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 2763 { 2764 int i; 2765 __be32 *targets = bond->params.arp_targets; 2766 2767 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) { 2768 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n", 2769 &sip, &tip, i, &targets[i], 2770 bond_has_this_ip(bond, tip)); 2771 if (sip == targets[i]) { 2772 if (bond_has_this_ip(bond, tip)) 2773 slave->last_arp_rx = jiffies; 2774 return; 2775 } 2776 } 2777 } 2778 2779 static void bond_arp_rcv(struct sk_buff *skb, struct bonding *bond, 2780 struct slave *slave) 2781 { 2782 struct arphdr *arp; 2783 unsigned char *arp_ptr; 2784 __be32 sip, tip; 2785 2786 if (skb->protocol != __cpu_to_be16(ETH_P_ARP)) 2787 return; 2788 2789 read_lock(&bond->lock); 2790 2791 pr_debug("bond_arp_rcv: bond %s skb->dev %s\n", 2792 bond->dev->name, skb->dev->name); 2793 2794 if (!pskb_may_pull(skb, arp_hdr_len(bond->dev))) 2795 goto out_unlock; 2796 2797 arp = arp_hdr(skb); 2798 if (arp->ar_hln != bond->dev->addr_len || 2799 skb->pkt_type == PACKET_OTHERHOST || 2800 skb->pkt_type == PACKET_LOOPBACK || 2801 arp->ar_hrd != htons(ARPHRD_ETHER) || 2802 arp->ar_pro != htons(ETH_P_IP) || 2803 arp->ar_pln != 4) 2804 goto out_unlock; 2805 2806 arp_ptr = (unsigned char *)(arp + 1); 2807 arp_ptr += bond->dev->addr_len; 2808 memcpy(&sip, arp_ptr, 4); 2809 arp_ptr += 4 + bond->dev->addr_len; 2810 memcpy(&tip, arp_ptr, 4); 2811 2812 pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n", 2813 bond->dev->name, slave->dev->name, bond_slave_state(slave), 2814 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 2815 &sip, &tip); 2816 2817 /* 2818 * Backup slaves won't see the ARP reply, but do come through 2819 * here for each ARP probe (so we swap the sip/tip to validate 2820 * the probe). In a "redundant switch, common router" type of 2821 * configuration, the ARP probe will (hopefully) travel from 2822 * the active, through one switch, the router, then the other 2823 * switch before reaching the backup. 2824 */ 2825 if (bond_is_active_slave(slave)) 2826 bond_validate_arp(bond, slave, sip, tip); 2827 else 2828 bond_validate_arp(bond, slave, tip, sip); 2829 2830 out_unlock: 2831 read_unlock(&bond->lock); 2832 } 2833 2834 /* 2835 * this function is called regularly to monitor each slave's link 2836 * ensuring that traffic is being sent and received when arp monitoring 2837 * is used in load-balancing mode. if the adapter has been dormant, then an 2838 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 2839 * arp monitoring in active backup mode. 2840 */ 2841 void bond_loadbalance_arp_mon(struct work_struct *work) 2842 { 2843 struct bonding *bond = container_of(work, struct bonding, 2844 arp_work.work); 2845 struct slave *slave, *oldcurrent; 2846 int do_failover = 0; 2847 int delta_in_ticks; 2848 int i; 2849 2850 read_lock(&bond->lock); 2851 2852 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2853 2854 if (bond->kill_timers) 2855 goto out; 2856 2857 if (bond->slave_cnt == 0) 2858 goto re_arm; 2859 2860 read_lock(&bond->curr_slave_lock); 2861 oldcurrent = bond->curr_active_slave; 2862 read_unlock(&bond->curr_slave_lock); 2863 2864 /* see if any of the previous devices are up now (i.e. they have 2865 * xmt and rcv traffic). the curr_active_slave does not come into 2866 * the picture unless it is null. also, slave->jiffies is not needed 2867 * here because we send an arp on each slave and give a slave as 2868 * long as it needs to get the tx/rx within the delta. 2869 * TODO: what about up/down delay in arp mode? it wasn't here before 2870 * so it can wait 2871 */ 2872 bond_for_each_slave(bond, slave, i) { 2873 unsigned long trans_start = dev_trans_start(slave->dev); 2874 2875 if (slave->link != BOND_LINK_UP) { 2876 if (time_in_range(jiffies, 2877 trans_start - delta_in_ticks, 2878 trans_start + delta_in_ticks) && 2879 time_in_range(jiffies, 2880 slave->dev->last_rx - delta_in_ticks, 2881 slave->dev->last_rx + delta_in_ticks)) { 2882 2883 slave->link = BOND_LINK_UP; 2884 bond_set_active_slave(slave); 2885 2886 /* primary_slave has no meaning in round-robin 2887 * mode. the window of a slave being up and 2888 * curr_active_slave being null after enslaving 2889 * is closed. 2890 */ 2891 if (!oldcurrent) { 2892 pr_info("%s: link status definitely up for interface %s, ", 2893 bond->dev->name, 2894 slave->dev->name); 2895 do_failover = 1; 2896 } else { 2897 pr_info("%s: interface %s is now up\n", 2898 bond->dev->name, 2899 slave->dev->name); 2900 } 2901 } 2902 } else { 2903 /* slave->link == BOND_LINK_UP */ 2904 2905 /* not all switches will respond to an arp request 2906 * when the source ip is 0, so don't take the link down 2907 * if we don't know our ip yet 2908 */ 2909 if (!time_in_range(jiffies, 2910 trans_start - delta_in_ticks, 2911 trans_start + 2 * delta_in_ticks) || 2912 !time_in_range(jiffies, 2913 slave->dev->last_rx - delta_in_ticks, 2914 slave->dev->last_rx + 2 * delta_in_ticks)) { 2915 2916 slave->link = BOND_LINK_DOWN; 2917 bond_set_backup_slave(slave); 2918 2919 if (slave->link_failure_count < UINT_MAX) 2920 slave->link_failure_count++; 2921 2922 pr_info("%s: interface %s is now down.\n", 2923 bond->dev->name, 2924 slave->dev->name); 2925 2926 if (slave == oldcurrent) 2927 do_failover = 1; 2928 } 2929 } 2930 2931 /* note: if switch is in round-robin mode, all links 2932 * must tx arp to ensure all links rx an arp - otherwise 2933 * links may oscillate or not come up at all; if switch is 2934 * in something like xor mode, there is nothing we can 2935 * do - all replies will be rx'ed on same link causing slaves 2936 * to be unstable during low/no traffic periods 2937 */ 2938 if (IS_UP(slave->dev)) 2939 bond_arp_send_all(bond, slave); 2940 } 2941 2942 if (do_failover) { 2943 block_netpoll_tx(); 2944 write_lock_bh(&bond->curr_slave_lock); 2945 2946 bond_select_active_slave(bond); 2947 2948 write_unlock_bh(&bond->curr_slave_lock); 2949 unblock_netpoll_tx(); 2950 } 2951 2952 re_arm: 2953 if (bond->params.arp_interval) 2954 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 2955 out: 2956 read_unlock(&bond->lock); 2957 } 2958 2959 /* 2960 * Called to inspect slaves for active-backup mode ARP monitor link state 2961 * changes. Sets new_link in slaves to specify what action should take 2962 * place for the slave. Returns 0 if no changes are found, >0 if changes 2963 * to link states must be committed. 2964 * 2965 * Called with bond->lock held for read. 2966 */ 2967 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks) 2968 { 2969 struct slave *slave; 2970 int i, commit = 0; 2971 unsigned long trans_start; 2972 2973 bond_for_each_slave(bond, slave, i) { 2974 slave->new_link = BOND_LINK_NOCHANGE; 2975 2976 if (slave->link != BOND_LINK_UP) { 2977 if (time_in_range(jiffies, 2978 slave_last_rx(bond, slave) - delta_in_ticks, 2979 slave_last_rx(bond, slave) + delta_in_ticks)) { 2980 2981 slave->new_link = BOND_LINK_UP; 2982 commit++; 2983 } 2984 2985 continue; 2986 } 2987 2988 /* 2989 * Give slaves 2*delta after being enslaved or made 2990 * active. This avoids bouncing, as the last receive 2991 * times need a full ARP monitor cycle to be updated. 2992 */ 2993 if (time_in_range(jiffies, 2994 slave->jiffies - delta_in_ticks, 2995 slave->jiffies + 2 * delta_in_ticks)) 2996 continue; 2997 2998 /* 2999 * Backup slave is down if: 3000 * - No current_arp_slave AND 3001 * - more than 3*delta since last receive AND 3002 * - the bond has an IP address 3003 * 3004 * Note: a non-null current_arp_slave indicates 3005 * the curr_active_slave went down and we are 3006 * searching for a new one; under this condition 3007 * we only take the curr_active_slave down - this 3008 * gives each slave a chance to tx/rx traffic 3009 * before being taken out 3010 */ 3011 if (!bond_is_active_slave(slave) && 3012 !bond->current_arp_slave && 3013 !time_in_range(jiffies, 3014 slave_last_rx(bond, slave) - delta_in_ticks, 3015 slave_last_rx(bond, slave) + 3 * delta_in_ticks)) { 3016 3017 slave->new_link = BOND_LINK_DOWN; 3018 commit++; 3019 } 3020 3021 /* 3022 * Active slave is down if: 3023 * - more than 2*delta since transmitting OR 3024 * - (more than 2*delta since receive AND 3025 * the bond has an IP address) 3026 */ 3027 trans_start = dev_trans_start(slave->dev); 3028 if (bond_is_active_slave(slave) && 3029 (!time_in_range(jiffies, 3030 trans_start - delta_in_ticks, 3031 trans_start + 2 * delta_in_ticks) || 3032 !time_in_range(jiffies, 3033 slave_last_rx(bond, slave) - delta_in_ticks, 3034 slave_last_rx(bond, slave) + 2 * delta_in_ticks))) { 3035 3036 slave->new_link = BOND_LINK_DOWN; 3037 commit++; 3038 } 3039 } 3040 3041 return commit; 3042 } 3043 3044 /* 3045 * Called to commit link state changes noted by inspection step of 3046 * active-backup mode ARP monitor. 3047 * 3048 * Called with RTNL and bond->lock for read. 3049 */ 3050 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks) 3051 { 3052 struct slave *slave; 3053 int i; 3054 unsigned long trans_start; 3055 3056 bond_for_each_slave(bond, slave, i) { 3057 switch (slave->new_link) { 3058 case BOND_LINK_NOCHANGE: 3059 continue; 3060 3061 case BOND_LINK_UP: 3062 trans_start = dev_trans_start(slave->dev); 3063 if ((!bond->curr_active_slave && 3064 time_in_range(jiffies, 3065 trans_start - delta_in_ticks, 3066 trans_start + delta_in_ticks)) || 3067 bond->curr_active_slave != slave) { 3068 slave->link = BOND_LINK_UP; 3069 bond->current_arp_slave = NULL; 3070 3071 pr_info("%s: link status definitely up for interface %s.\n", 3072 bond->dev->name, slave->dev->name); 3073 3074 if (!bond->curr_active_slave || 3075 (slave == bond->primary_slave)) 3076 goto do_failover; 3077 3078 } 3079 3080 continue; 3081 3082 case BOND_LINK_DOWN: 3083 if (slave->link_failure_count < UINT_MAX) 3084 slave->link_failure_count++; 3085 3086 slave->link = BOND_LINK_DOWN; 3087 bond_set_slave_inactive_flags(slave); 3088 3089 pr_info("%s: link status definitely down for interface %s, disabling it\n", 3090 bond->dev->name, slave->dev->name); 3091 3092 if (slave == bond->curr_active_slave) { 3093 bond->current_arp_slave = NULL; 3094 goto do_failover; 3095 } 3096 3097 continue; 3098 3099 default: 3100 pr_err("%s: impossible: new_link %d on slave %s\n", 3101 bond->dev->name, slave->new_link, 3102 slave->dev->name); 3103 continue; 3104 } 3105 3106 do_failover: 3107 ASSERT_RTNL(); 3108 block_netpoll_tx(); 3109 write_lock_bh(&bond->curr_slave_lock); 3110 bond_select_active_slave(bond); 3111 write_unlock_bh(&bond->curr_slave_lock); 3112 unblock_netpoll_tx(); 3113 } 3114 3115 bond_set_carrier(bond); 3116 } 3117 3118 /* 3119 * Send ARP probes for active-backup mode ARP monitor. 3120 * 3121 * Called with bond->lock held for read. 3122 */ 3123 static void bond_ab_arp_probe(struct bonding *bond) 3124 { 3125 struct slave *slave; 3126 int i; 3127 3128 read_lock(&bond->curr_slave_lock); 3129 3130 if (bond->current_arp_slave && bond->curr_active_slave) 3131 pr_info("PROBE: c_arp %s && cas %s BAD\n", 3132 bond->current_arp_slave->dev->name, 3133 bond->curr_active_slave->dev->name); 3134 3135 if (bond->curr_active_slave) { 3136 bond_arp_send_all(bond, bond->curr_active_slave); 3137 read_unlock(&bond->curr_slave_lock); 3138 return; 3139 } 3140 3141 read_unlock(&bond->curr_slave_lock); 3142 3143 /* if we don't have a curr_active_slave, search for the next available 3144 * backup slave from the current_arp_slave and make it the candidate 3145 * for becoming the curr_active_slave 3146 */ 3147 3148 if (!bond->current_arp_slave) { 3149 bond->current_arp_slave = bond->first_slave; 3150 if (!bond->current_arp_slave) 3151 return; 3152 } 3153 3154 bond_set_slave_inactive_flags(bond->current_arp_slave); 3155 3156 /* search for next candidate */ 3157 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) { 3158 if (IS_UP(slave->dev)) { 3159 slave->link = BOND_LINK_BACK; 3160 bond_set_slave_active_flags(slave); 3161 bond_arp_send_all(bond, slave); 3162 slave->jiffies = jiffies; 3163 bond->current_arp_slave = slave; 3164 break; 3165 } 3166 3167 /* if the link state is up at this point, we 3168 * mark it down - this can happen if we have 3169 * simultaneous link failures and 3170 * reselect_active_interface doesn't make this 3171 * one the current slave so it is still marked 3172 * up when it is actually down 3173 */ 3174 if (slave->link == BOND_LINK_UP) { 3175 slave->link = BOND_LINK_DOWN; 3176 if (slave->link_failure_count < UINT_MAX) 3177 slave->link_failure_count++; 3178 3179 bond_set_slave_inactive_flags(slave); 3180 3181 pr_info("%s: backup interface %s is now down.\n", 3182 bond->dev->name, slave->dev->name); 3183 } 3184 } 3185 } 3186 3187 void bond_activebackup_arp_mon(struct work_struct *work) 3188 { 3189 struct bonding *bond = container_of(work, struct bonding, 3190 arp_work.work); 3191 bool should_notify_peers = false; 3192 int delta_in_ticks; 3193 3194 read_lock(&bond->lock); 3195 3196 if (bond->kill_timers) 3197 goto out; 3198 3199 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3200 3201 if (bond->slave_cnt == 0) 3202 goto re_arm; 3203 3204 should_notify_peers = bond_should_notify_peers(bond); 3205 3206 if (bond_ab_arp_inspect(bond, delta_in_ticks)) { 3207 read_unlock(&bond->lock); 3208 rtnl_lock(); 3209 read_lock(&bond->lock); 3210 3211 bond_ab_arp_commit(bond, delta_in_ticks); 3212 3213 read_unlock(&bond->lock); 3214 rtnl_unlock(); 3215 read_lock(&bond->lock); 3216 } 3217 3218 bond_ab_arp_probe(bond); 3219 3220 re_arm: 3221 if (bond->params.arp_interval) 3222 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 3223 out: 3224 read_unlock(&bond->lock); 3225 3226 if (should_notify_peers) { 3227 rtnl_lock(); 3228 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS); 3229 rtnl_unlock(); 3230 } 3231 } 3232 3233 /*-------------------------- netdev event handling --------------------------*/ 3234 3235 /* 3236 * Change device name 3237 */ 3238 static int bond_event_changename(struct bonding *bond) 3239 { 3240 bond_remove_proc_entry(bond); 3241 bond_create_proc_entry(bond); 3242 3243 bond_debug_reregister(bond); 3244 3245 return NOTIFY_DONE; 3246 } 3247 3248 static int bond_master_netdev_event(unsigned long event, 3249 struct net_device *bond_dev) 3250 { 3251 struct bonding *event_bond = netdev_priv(bond_dev); 3252 3253 switch (event) { 3254 case NETDEV_CHANGENAME: 3255 return bond_event_changename(event_bond); 3256 default: 3257 break; 3258 } 3259 3260 return NOTIFY_DONE; 3261 } 3262 3263 static int bond_slave_netdev_event(unsigned long event, 3264 struct net_device *slave_dev) 3265 { 3266 struct net_device *bond_dev = slave_dev->master; 3267 struct bonding *bond = netdev_priv(bond_dev); 3268 3269 switch (event) { 3270 case NETDEV_UNREGISTER: 3271 if (bond_dev) { 3272 if (bond->setup_by_slave) 3273 bond_release_and_destroy(bond_dev, slave_dev); 3274 else 3275 bond_release(bond_dev, slave_dev); 3276 } 3277 break; 3278 case NETDEV_CHANGE: 3279 if (bond->params.mode == BOND_MODE_8023AD || bond_is_lb(bond)) { 3280 struct slave *slave; 3281 3282 slave = bond_get_slave_by_dev(bond, slave_dev); 3283 if (slave) { 3284 u32 old_speed = slave->speed; 3285 u8 old_duplex = slave->duplex; 3286 3287 bond_update_speed_duplex(slave); 3288 3289 if (bond_is_lb(bond)) 3290 break; 3291 3292 if (old_speed != slave->speed) 3293 bond_3ad_adapter_speed_changed(slave); 3294 if (old_duplex != slave->duplex) 3295 bond_3ad_adapter_duplex_changed(slave); 3296 } 3297 } 3298 3299 break; 3300 case NETDEV_DOWN: 3301 /* 3302 * ... Or is it this? 3303 */ 3304 break; 3305 case NETDEV_CHANGEMTU: 3306 /* 3307 * TODO: Should slaves be allowed to 3308 * independently alter their MTU? For 3309 * an active-backup bond, slaves need 3310 * not be the same type of device, so 3311 * MTUs may vary. For other modes, 3312 * slaves arguably should have the 3313 * same MTUs. To do this, we'd need to 3314 * take over the slave's change_mtu 3315 * function for the duration of their 3316 * servitude. 3317 */ 3318 break; 3319 case NETDEV_CHANGENAME: 3320 /* 3321 * TODO: handle changing the primary's name 3322 */ 3323 break; 3324 case NETDEV_FEAT_CHANGE: 3325 bond_compute_features(bond); 3326 break; 3327 default: 3328 break; 3329 } 3330 3331 return NOTIFY_DONE; 3332 } 3333 3334 /* 3335 * bond_netdev_event: handle netdev notifier chain events. 3336 * 3337 * This function receives events for the netdev chain. The caller (an 3338 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 3339 * locks for us to safely manipulate the slave devices (RTNL lock, 3340 * dev_probe_lock). 3341 */ 3342 static int bond_netdev_event(struct notifier_block *this, 3343 unsigned long event, void *ptr) 3344 { 3345 struct net_device *event_dev = (struct net_device *)ptr; 3346 3347 pr_debug("event_dev: %s, event: %lx\n", 3348 event_dev ? event_dev->name : "None", 3349 event); 3350 3351 if (!(event_dev->priv_flags & IFF_BONDING)) 3352 return NOTIFY_DONE; 3353 3354 if (event_dev->flags & IFF_MASTER) { 3355 pr_debug("IFF_MASTER\n"); 3356 return bond_master_netdev_event(event, event_dev); 3357 } 3358 3359 if (event_dev->flags & IFF_SLAVE) { 3360 pr_debug("IFF_SLAVE\n"); 3361 return bond_slave_netdev_event(event, event_dev); 3362 } 3363 3364 return NOTIFY_DONE; 3365 } 3366 3367 /* 3368 * bond_inetaddr_event: handle inetaddr notifier chain events. 3369 * 3370 * We keep track of device IPs primarily to use as source addresses in 3371 * ARP monitor probes (rather than spewing out broadcasts all the time). 3372 * 3373 * We track one IP for the main device (if it has one), plus one per VLAN. 3374 */ 3375 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) 3376 { 3377 struct in_ifaddr *ifa = ptr; 3378 struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev; 3379 struct bond_net *bn = net_generic(dev_net(event_dev), bond_net_id); 3380 struct bonding *bond; 3381 struct vlan_entry *vlan; 3382 3383 list_for_each_entry(bond, &bn->dev_list, bond_list) { 3384 if (bond->dev == event_dev) { 3385 switch (event) { 3386 case NETDEV_UP: 3387 bond->master_ip = ifa->ifa_local; 3388 return NOTIFY_OK; 3389 case NETDEV_DOWN: 3390 bond->master_ip = bond_glean_dev_ip(bond->dev); 3391 return NOTIFY_OK; 3392 default: 3393 return NOTIFY_DONE; 3394 } 3395 } 3396 3397 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 3398 if (!bond->vlgrp) 3399 continue; 3400 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id); 3401 if (vlan_dev == event_dev) { 3402 switch (event) { 3403 case NETDEV_UP: 3404 vlan->vlan_ip = ifa->ifa_local; 3405 return NOTIFY_OK; 3406 case NETDEV_DOWN: 3407 vlan->vlan_ip = 3408 bond_glean_dev_ip(vlan_dev); 3409 return NOTIFY_OK; 3410 default: 3411 return NOTIFY_DONE; 3412 } 3413 } 3414 } 3415 } 3416 return NOTIFY_DONE; 3417 } 3418 3419 static struct notifier_block bond_netdev_notifier = { 3420 .notifier_call = bond_netdev_event, 3421 }; 3422 3423 static struct notifier_block bond_inetaddr_notifier = { 3424 .notifier_call = bond_inetaddr_event, 3425 }; 3426 3427 /*---------------------------- Hashing Policies -----------------------------*/ 3428 3429 /* 3430 * Hash for the output device based upon layer 2 and layer 3 data. If 3431 * the packet is not IP mimic bond_xmit_hash_policy_l2() 3432 */ 3433 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count) 3434 { 3435 struct ethhdr *data = (struct ethhdr *)skb->data; 3436 struct iphdr *iph = ip_hdr(skb); 3437 3438 if (skb->protocol == htons(ETH_P_IP)) { 3439 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^ 3440 (data->h_dest[5] ^ data->h_source[5])) % count; 3441 } 3442 3443 return (data->h_dest[5] ^ data->h_source[5]) % count; 3444 } 3445 3446 /* 3447 * Hash for the output device based upon layer 3 and layer 4 data. If 3448 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is 3449 * altogether not IP, mimic bond_xmit_hash_policy_l2() 3450 */ 3451 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count) 3452 { 3453 struct ethhdr *data = (struct ethhdr *)skb->data; 3454 struct iphdr *iph = ip_hdr(skb); 3455 __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl); 3456 int layer4_xor = 0; 3457 3458 if (skb->protocol == htons(ETH_P_IP)) { 3459 if (!(iph->frag_off & htons(IP_MF|IP_OFFSET)) && 3460 (iph->protocol == IPPROTO_TCP || 3461 iph->protocol == IPPROTO_UDP)) { 3462 layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1))); 3463 } 3464 return (layer4_xor ^ 3465 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count; 3466 3467 } 3468 3469 return (data->h_dest[5] ^ data->h_source[5]) % count; 3470 } 3471 3472 /* 3473 * Hash for the output device based upon layer 2 data 3474 */ 3475 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count) 3476 { 3477 struct ethhdr *data = (struct ethhdr *)skb->data; 3478 3479 return (data->h_dest[5] ^ data->h_source[5]) % count; 3480 } 3481 3482 /*-------------------------- Device entry points ----------------------------*/ 3483 3484 static int bond_open(struct net_device *bond_dev) 3485 { 3486 struct bonding *bond = netdev_priv(bond_dev); 3487 3488 bond->kill_timers = 0; 3489 3490 INIT_DELAYED_WORK(&bond->mcast_work, bond_resend_igmp_join_requests_delayed); 3491 3492 if (bond_is_lb(bond)) { 3493 /* bond_alb_initialize must be called before the timer 3494 * is started. 3495 */ 3496 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) { 3497 /* something went wrong - fail the open operation */ 3498 return -ENOMEM; 3499 } 3500 3501 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 3502 queue_delayed_work(bond->wq, &bond->alb_work, 0); 3503 } 3504 3505 if (bond->params.miimon) { /* link check interval, in milliseconds. */ 3506 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 3507 queue_delayed_work(bond->wq, &bond->mii_work, 0); 3508 } 3509 3510 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 3511 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) 3512 INIT_DELAYED_WORK(&bond->arp_work, 3513 bond_activebackup_arp_mon); 3514 else 3515 INIT_DELAYED_WORK(&bond->arp_work, 3516 bond_loadbalance_arp_mon); 3517 3518 queue_delayed_work(bond->wq, &bond->arp_work, 0); 3519 if (bond->params.arp_validate) 3520 bond->recv_probe = bond_arp_rcv; 3521 } 3522 3523 if (bond->params.mode == BOND_MODE_8023AD) { 3524 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 3525 queue_delayed_work(bond->wq, &bond->ad_work, 0); 3526 /* register to receive LACPDUs */ 3527 bond->recv_probe = bond_3ad_lacpdu_recv; 3528 bond_3ad_initiate_agg_selection(bond, 1); 3529 } 3530 3531 return 0; 3532 } 3533 3534 static int bond_close(struct net_device *bond_dev) 3535 { 3536 struct bonding *bond = netdev_priv(bond_dev); 3537 3538 write_lock_bh(&bond->lock); 3539 3540 bond->send_peer_notif = 0; 3541 3542 /* signal timers not to re-arm */ 3543 bond->kill_timers = 1; 3544 3545 write_unlock_bh(&bond->lock); 3546 3547 if (bond->params.miimon) { /* link check interval, in milliseconds. */ 3548 cancel_delayed_work(&bond->mii_work); 3549 } 3550 3551 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 3552 cancel_delayed_work(&bond->arp_work); 3553 } 3554 3555 switch (bond->params.mode) { 3556 case BOND_MODE_8023AD: 3557 cancel_delayed_work(&bond->ad_work); 3558 break; 3559 case BOND_MODE_TLB: 3560 case BOND_MODE_ALB: 3561 cancel_delayed_work(&bond->alb_work); 3562 break; 3563 default: 3564 break; 3565 } 3566 3567 if (delayed_work_pending(&bond->mcast_work)) 3568 cancel_delayed_work(&bond->mcast_work); 3569 3570 if (bond_is_lb(bond)) { 3571 /* Must be called only after all 3572 * slaves have been released 3573 */ 3574 bond_alb_deinitialize(bond); 3575 } 3576 bond->recv_probe = NULL; 3577 3578 return 0; 3579 } 3580 3581 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev, 3582 struct rtnl_link_stats64 *stats) 3583 { 3584 struct bonding *bond = netdev_priv(bond_dev); 3585 struct rtnl_link_stats64 temp; 3586 struct slave *slave; 3587 int i; 3588 3589 memset(stats, 0, sizeof(*stats)); 3590 3591 read_lock_bh(&bond->lock); 3592 3593 bond_for_each_slave(bond, slave, i) { 3594 const struct rtnl_link_stats64 *sstats = 3595 dev_get_stats(slave->dev, &temp); 3596 3597 stats->rx_packets += sstats->rx_packets; 3598 stats->rx_bytes += sstats->rx_bytes; 3599 stats->rx_errors += sstats->rx_errors; 3600 stats->rx_dropped += sstats->rx_dropped; 3601 3602 stats->tx_packets += sstats->tx_packets; 3603 stats->tx_bytes += sstats->tx_bytes; 3604 stats->tx_errors += sstats->tx_errors; 3605 stats->tx_dropped += sstats->tx_dropped; 3606 3607 stats->multicast += sstats->multicast; 3608 stats->collisions += sstats->collisions; 3609 3610 stats->rx_length_errors += sstats->rx_length_errors; 3611 stats->rx_over_errors += sstats->rx_over_errors; 3612 stats->rx_crc_errors += sstats->rx_crc_errors; 3613 stats->rx_frame_errors += sstats->rx_frame_errors; 3614 stats->rx_fifo_errors += sstats->rx_fifo_errors; 3615 stats->rx_missed_errors += sstats->rx_missed_errors; 3616 3617 stats->tx_aborted_errors += sstats->tx_aborted_errors; 3618 stats->tx_carrier_errors += sstats->tx_carrier_errors; 3619 stats->tx_fifo_errors += sstats->tx_fifo_errors; 3620 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors; 3621 stats->tx_window_errors += sstats->tx_window_errors; 3622 } 3623 3624 read_unlock_bh(&bond->lock); 3625 3626 return stats; 3627 } 3628 3629 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 3630 { 3631 struct net_device *slave_dev = NULL; 3632 struct ifbond k_binfo; 3633 struct ifbond __user *u_binfo = NULL; 3634 struct ifslave k_sinfo; 3635 struct ifslave __user *u_sinfo = NULL; 3636 struct mii_ioctl_data *mii = NULL; 3637 int res = 0; 3638 3639 pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd); 3640 3641 switch (cmd) { 3642 case SIOCGMIIPHY: 3643 mii = if_mii(ifr); 3644 if (!mii) 3645 return -EINVAL; 3646 3647 mii->phy_id = 0; 3648 /* Fall Through */ 3649 case SIOCGMIIREG: 3650 /* 3651 * We do this again just in case we were called by SIOCGMIIREG 3652 * instead of SIOCGMIIPHY. 3653 */ 3654 mii = if_mii(ifr); 3655 if (!mii) 3656 return -EINVAL; 3657 3658 3659 if (mii->reg_num == 1) { 3660 struct bonding *bond = netdev_priv(bond_dev); 3661 mii->val_out = 0; 3662 read_lock(&bond->lock); 3663 read_lock(&bond->curr_slave_lock); 3664 if (netif_carrier_ok(bond->dev)) 3665 mii->val_out = BMSR_LSTATUS; 3666 3667 read_unlock(&bond->curr_slave_lock); 3668 read_unlock(&bond->lock); 3669 } 3670 3671 return 0; 3672 case BOND_INFO_QUERY_OLD: 3673 case SIOCBONDINFOQUERY: 3674 u_binfo = (struct ifbond __user *)ifr->ifr_data; 3675 3676 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 3677 return -EFAULT; 3678 3679 res = bond_info_query(bond_dev, &k_binfo); 3680 if (res == 0 && 3681 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 3682 return -EFAULT; 3683 3684 return res; 3685 case BOND_SLAVE_INFO_QUERY_OLD: 3686 case SIOCBONDSLAVEINFOQUERY: 3687 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 3688 3689 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 3690 return -EFAULT; 3691 3692 res = bond_slave_info_query(bond_dev, &k_sinfo); 3693 if (res == 0 && 3694 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 3695 return -EFAULT; 3696 3697 return res; 3698 default: 3699 /* Go on */ 3700 break; 3701 } 3702 3703 if (!capable(CAP_NET_ADMIN)) 3704 return -EPERM; 3705 3706 slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave); 3707 3708 pr_debug("slave_dev=%p:\n", slave_dev); 3709 3710 if (!slave_dev) 3711 res = -ENODEV; 3712 else { 3713 pr_debug("slave_dev->name=%s:\n", slave_dev->name); 3714 switch (cmd) { 3715 case BOND_ENSLAVE_OLD: 3716 case SIOCBONDENSLAVE: 3717 res = bond_enslave(bond_dev, slave_dev); 3718 break; 3719 case BOND_RELEASE_OLD: 3720 case SIOCBONDRELEASE: 3721 res = bond_release(bond_dev, slave_dev); 3722 break; 3723 case BOND_SETHWADDR_OLD: 3724 case SIOCBONDSETHWADDR: 3725 res = bond_sethwaddr(bond_dev, slave_dev); 3726 break; 3727 case BOND_CHANGE_ACTIVE_OLD: 3728 case SIOCBONDCHANGEACTIVE: 3729 res = bond_ioctl_change_active(bond_dev, slave_dev); 3730 break; 3731 default: 3732 res = -EOPNOTSUPP; 3733 } 3734 3735 dev_put(slave_dev); 3736 } 3737 3738 return res; 3739 } 3740 3741 static bool bond_addr_in_mc_list(unsigned char *addr, 3742 struct netdev_hw_addr_list *list, 3743 int addrlen) 3744 { 3745 struct netdev_hw_addr *ha; 3746 3747 netdev_hw_addr_list_for_each(ha, list) 3748 if (!memcmp(ha->addr, addr, addrlen)) 3749 return true; 3750 3751 return false; 3752 } 3753 3754 static void bond_set_multicast_list(struct net_device *bond_dev) 3755 { 3756 struct bonding *bond = netdev_priv(bond_dev); 3757 struct netdev_hw_addr *ha; 3758 bool found; 3759 3760 /* 3761 * Do promisc before checking multicast_mode 3762 */ 3763 if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) 3764 /* 3765 * FIXME: Need to handle the error when one of the multi-slaves 3766 * encounters error. 3767 */ 3768 bond_set_promiscuity(bond, 1); 3769 3770 3771 if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) 3772 bond_set_promiscuity(bond, -1); 3773 3774 3775 /* set allmulti flag to slaves */ 3776 if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) 3777 /* 3778 * FIXME: Need to handle the error when one of the multi-slaves 3779 * encounters error. 3780 */ 3781 bond_set_allmulti(bond, 1); 3782 3783 3784 if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) 3785 bond_set_allmulti(bond, -1); 3786 3787 3788 read_lock(&bond->lock); 3789 3790 bond->flags = bond_dev->flags; 3791 3792 /* looking for addresses to add to slaves' mc list */ 3793 netdev_for_each_mc_addr(ha, bond_dev) { 3794 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list, 3795 bond_dev->addr_len); 3796 if (!found) 3797 bond_mc_add(bond, ha->addr); 3798 } 3799 3800 /* looking for addresses to delete from slaves' list */ 3801 netdev_hw_addr_list_for_each(ha, &bond->mc_list) { 3802 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc, 3803 bond_dev->addr_len); 3804 if (!found) 3805 bond_mc_del(bond, ha->addr); 3806 } 3807 3808 /* save master's multicast list */ 3809 __hw_addr_flush(&bond->mc_list); 3810 __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc, 3811 bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST); 3812 3813 read_unlock(&bond->lock); 3814 } 3815 3816 static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms) 3817 { 3818 struct bonding *bond = netdev_priv(dev); 3819 struct slave *slave = bond->first_slave; 3820 3821 if (slave) { 3822 const struct net_device_ops *slave_ops 3823 = slave->dev->netdev_ops; 3824 if (slave_ops->ndo_neigh_setup) 3825 return slave_ops->ndo_neigh_setup(slave->dev, parms); 3826 } 3827 return 0; 3828 } 3829 3830 /* 3831 * Change the MTU of all of a master's slaves to match the master 3832 */ 3833 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 3834 { 3835 struct bonding *bond = netdev_priv(bond_dev); 3836 struct slave *slave, *stop_at; 3837 int res = 0; 3838 int i; 3839 3840 pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond, 3841 (bond_dev ? bond_dev->name : "None"), new_mtu); 3842 3843 /* Can't hold bond->lock with bh disabled here since 3844 * some base drivers panic. On the other hand we can't 3845 * hold bond->lock without bh disabled because we'll 3846 * deadlock. The only solution is to rely on the fact 3847 * that we're under rtnl_lock here, and the slaves 3848 * list won't change. This doesn't solve the problem 3849 * of setting the slave's MTU while it is 3850 * transmitting, but the assumption is that the base 3851 * driver can handle that. 3852 * 3853 * TODO: figure out a way to safely iterate the slaves 3854 * list, but without holding a lock around the actual 3855 * call to the base driver. 3856 */ 3857 3858 bond_for_each_slave(bond, slave, i) { 3859 pr_debug("s %p s->p %p c_m %p\n", 3860 slave, 3861 slave->prev, 3862 slave->dev->netdev_ops->ndo_change_mtu); 3863 3864 res = dev_set_mtu(slave->dev, new_mtu); 3865 3866 if (res) { 3867 /* If we failed to set the slave's mtu to the new value 3868 * we must abort the operation even in ACTIVE_BACKUP 3869 * mode, because if we allow the backup slaves to have 3870 * different mtu values than the active slave we'll 3871 * need to change their mtu when doing a failover. That 3872 * means changing their mtu from timer context, which 3873 * is probably not a good idea. 3874 */ 3875 pr_debug("err %d %s\n", res, slave->dev->name); 3876 goto unwind; 3877 } 3878 } 3879 3880 bond_dev->mtu = new_mtu; 3881 3882 return 0; 3883 3884 unwind: 3885 /* unwind from head to the slave that failed */ 3886 stop_at = slave; 3887 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { 3888 int tmp_res; 3889 3890 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu); 3891 if (tmp_res) { 3892 pr_debug("unwind err %d dev %s\n", 3893 tmp_res, slave->dev->name); 3894 } 3895 } 3896 3897 return res; 3898 } 3899 3900 /* 3901 * Change HW address 3902 * 3903 * Note that many devices must be down to change the HW address, and 3904 * downing the master releases all slaves. We can make bonds full of 3905 * bonding devices to test this, however. 3906 */ 3907 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 3908 { 3909 struct bonding *bond = netdev_priv(bond_dev); 3910 struct sockaddr *sa = addr, tmp_sa; 3911 struct slave *slave, *stop_at; 3912 int res = 0; 3913 int i; 3914 3915 if (bond->params.mode == BOND_MODE_ALB) 3916 return bond_alb_set_mac_address(bond_dev, addr); 3917 3918 3919 pr_debug("bond=%p, name=%s\n", 3920 bond, bond_dev ? bond_dev->name : "None"); 3921 3922 /* 3923 * If fail_over_mac is set to active, do nothing and return 3924 * success. Returning an error causes ifenslave to fail. 3925 */ 3926 if (bond->params.fail_over_mac == BOND_FOM_ACTIVE) 3927 return 0; 3928 3929 if (!is_valid_ether_addr(sa->sa_data)) 3930 return -EADDRNOTAVAIL; 3931 3932 /* Can't hold bond->lock with bh disabled here since 3933 * some base drivers panic. On the other hand we can't 3934 * hold bond->lock without bh disabled because we'll 3935 * deadlock. The only solution is to rely on the fact 3936 * that we're under rtnl_lock here, and the slaves 3937 * list won't change. This doesn't solve the problem 3938 * of setting the slave's hw address while it is 3939 * transmitting, but the assumption is that the base 3940 * driver can handle that. 3941 * 3942 * TODO: figure out a way to safely iterate the slaves 3943 * list, but without holding a lock around the actual 3944 * call to the base driver. 3945 */ 3946 3947 bond_for_each_slave(bond, slave, i) { 3948 const struct net_device_ops *slave_ops = slave->dev->netdev_ops; 3949 pr_debug("slave %p %s\n", slave, slave->dev->name); 3950 3951 if (slave_ops->ndo_set_mac_address == NULL) { 3952 res = -EOPNOTSUPP; 3953 pr_debug("EOPNOTSUPP %s\n", slave->dev->name); 3954 goto unwind; 3955 } 3956 3957 res = dev_set_mac_address(slave->dev, addr); 3958 if (res) { 3959 /* TODO: consider downing the slave 3960 * and retry ? 3961 * User should expect communications 3962 * breakage anyway until ARP finish 3963 * updating, so... 3964 */ 3965 pr_debug("err %d %s\n", res, slave->dev->name); 3966 goto unwind; 3967 } 3968 } 3969 3970 /* success */ 3971 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); 3972 return 0; 3973 3974 unwind: 3975 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 3976 tmp_sa.sa_family = bond_dev->type; 3977 3978 /* unwind from head to the slave that failed */ 3979 stop_at = slave; 3980 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { 3981 int tmp_res; 3982 3983 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa); 3984 if (tmp_res) { 3985 pr_debug("unwind err %d dev %s\n", 3986 tmp_res, slave->dev->name); 3987 } 3988 } 3989 3990 return res; 3991 } 3992 3993 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev) 3994 { 3995 struct bonding *bond = netdev_priv(bond_dev); 3996 struct slave *slave, *start_at; 3997 int i, slave_no, res = 1; 3998 struct iphdr *iph = ip_hdr(skb); 3999 4000 /* 4001 * Start with the curr_active_slave that joined the bond as the 4002 * default for sending IGMP traffic. For failover purposes one 4003 * needs to maintain some consistency for the interface that will 4004 * send the join/membership reports. The curr_active_slave found 4005 * will send all of this type of traffic. 4006 */ 4007 if ((iph->protocol == IPPROTO_IGMP) && 4008 (skb->protocol == htons(ETH_P_IP))) { 4009 4010 read_lock(&bond->curr_slave_lock); 4011 slave = bond->curr_active_slave; 4012 read_unlock(&bond->curr_slave_lock); 4013 4014 if (!slave) 4015 goto out; 4016 } else { 4017 /* 4018 * Concurrent TX may collide on rr_tx_counter; we accept 4019 * that as being rare enough not to justify using an 4020 * atomic op here. 4021 */ 4022 slave_no = bond->rr_tx_counter++ % bond->slave_cnt; 4023 4024 bond_for_each_slave(bond, slave, i) { 4025 slave_no--; 4026 if (slave_no < 0) 4027 break; 4028 } 4029 } 4030 4031 start_at = slave; 4032 bond_for_each_slave_from(bond, slave, i, start_at) { 4033 if (IS_UP(slave->dev) && 4034 (slave->link == BOND_LINK_UP) && 4035 bond_is_active_slave(slave)) { 4036 res = bond_dev_queue_xmit(bond, skb, slave->dev); 4037 break; 4038 } 4039 } 4040 4041 out: 4042 if (res) { 4043 /* no suitable interface, frame not sent */ 4044 dev_kfree_skb(skb); 4045 } 4046 4047 return NETDEV_TX_OK; 4048 } 4049 4050 4051 /* 4052 * in active-backup mode, we know that bond->curr_active_slave is always valid if 4053 * the bond has a usable interface. 4054 */ 4055 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev) 4056 { 4057 struct bonding *bond = netdev_priv(bond_dev); 4058 int res = 1; 4059 4060 read_lock(&bond->curr_slave_lock); 4061 4062 if (bond->curr_active_slave) 4063 res = bond_dev_queue_xmit(bond, skb, 4064 bond->curr_active_slave->dev); 4065 4066 if (res) 4067 /* no suitable interface, frame not sent */ 4068 dev_kfree_skb(skb); 4069 4070 read_unlock(&bond->curr_slave_lock); 4071 4072 return NETDEV_TX_OK; 4073 } 4074 4075 /* 4076 * In bond_xmit_xor() , we determine the output device by using a pre- 4077 * determined xmit_hash_policy(), If the selected device is not enabled, 4078 * find the next active slave. 4079 */ 4080 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev) 4081 { 4082 struct bonding *bond = netdev_priv(bond_dev); 4083 struct slave *slave, *start_at; 4084 int slave_no; 4085 int i; 4086 int res = 1; 4087 4088 slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt); 4089 4090 bond_for_each_slave(bond, slave, i) { 4091 slave_no--; 4092 if (slave_no < 0) 4093 break; 4094 } 4095 4096 start_at = slave; 4097 4098 bond_for_each_slave_from(bond, slave, i, start_at) { 4099 if (IS_UP(slave->dev) && 4100 (slave->link == BOND_LINK_UP) && 4101 bond_is_active_slave(slave)) { 4102 res = bond_dev_queue_xmit(bond, skb, slave->dev); 4103 break; 4104 } 4105 } 4106 4107 if (res) { 4108 /* no suitable interface, frame not sent */ 4109 dev_kfree_skb(skb); 4110 } 4111 4112 return NETDEV_TX_OK; 4113 } 4114 4115 /* 4116 * in broadcast mode, we send everything to all usable interfaces. 4117 */ 4118 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev) 4119 { 4120 struct bonding *bond = netdev_priv(bond_dev); 4121 struct slave *slave, *start_at; 4122 struct net_device *tx_dev = NULL; 4123 int i; 4124 int res = 1; 4125 4126 read_lock(&bond->curr_slave_lock); 4127 start_at = bond->curr_active_slave; 4128 read_unlock(&bond->curr_slave_lock); 4129 4130 if (!start_at) 4131 goto out; 4132 4133 bond_for_each_slave_from(bond, slave, i, start_at) { 4134 if (IS_UP(slave->dev) && 4135 (slave->link == BOND_LINK_UP) && 4136 bond_is_active_slave(slave)) { 4137 if (tx_dev) { 4138 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 4139 if (!skb2) { 4140 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n", 4141 bond_dev->name); 4142 continue; 4143 } 4144 4145 res = bond_dev_queue_xmit(bond, skb2, tx_dev); 4146 if (res) { 4147 dev_kfree_skb(skb2); 4148 continue; 4149 } 4150 } 4151 tx_dev = slave->dev; 4152 } 4153 } 4154 4155 if (tx_dev) 4156 res = bond_dev_queue_xmit(bond, skb, tx_dev); 4157 4158 out: 4159 if (res) 4160 /* no suitable interface, frame not sent */ 4161 dev_kfree_skb(skb); 4162 4163 /* frame sent to all suitable interfaces */ 4164 return NETDEV_TX_OK; 4165 } 4166 4167 /*------------------------- Device initialization ---------------------------*/ 4168 4169 static void bond_set_xmit_hash_policy(struct bonding *bond) 4170 { 4171 switch (bond->params.xmit_policy) { 4172 case BOND_XMIT_POLICY_LAYER23: 4173 bond->xmit_hash_policy = bond_xmit_hash_policy_l23; 4174 break; 4175 case BOND_XMIT_POLICY_LAYER34: 4176 bond->xmit_hash_policy = bond_xmit_hash_policy_l34; 4177 break; 4178 case BOND_XMIT_POLICY_LAYER2: 4179 default: 4180 bond->xmit_hash_policy = bond_xmit_hash_policy_l2; 4181 break; 4182 } 4183 } 4184 4185 /* 4186 * Lookup the slave that corresponds to a qid 4187 */ 4188 static inline int bond_slave_override(struct bonding *bond, 4189 struct sk_buff *skb) 4190 { 4191 int i, res = 1; 4192 struct slave *slave = NULL; 4193 struct slave *check_slave; 4194 4195 if (!skb->queue_mapping) 4196 return 1; 4197 4198 /* Find out if any slaves have the same mapping as this skb. */ 4199 bond_for_each_slave(bond, check_slave, i) { 4200 if (check_slave->queue_id == skb->queue_mapping) { 4201 slave = check_slave; 4202 break; 4203 } 4204 } 4205 4206 /* If the slave isn't UP, use default transmit policy. */ 4207 if (slave && slave->queue_id && IS_UP(slave->dev) && 4208 (slave->link == BOND_LINK_UP)) { 4209 res = bond_dev_queue_xmit(bond, skb, slave->dev); 4210 } 4211 4212 return res; 4213 } 4214 4215 4216 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb) 4217 { 4218 /* 4219 * This helper function exists to help dev_pick_tx get the correct 4220 * destination queue. Using a helper function skips a call to 4221 * skb_tx_hash and will put the skbs in the queue we expect on their 4222 * way down to the bonding driver. 4223 */ 4224 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 4225 4226 /* 4227 * Save the original txq to restore before passing to the driver 4228 */ 4229 bond_queue_mapping(skb) = skb->queue_mapping; 4230 4231 if (unlikely(txq >= dev->real_num_tx_queues)) { 4232 do { 4233 txq -= dev->real_num_tx_queues; 4234 } while (txq >= dev->real_num_tx_queues); 4235 } 4236 return txq; 4237 } 4238 4239 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4240 { 4241 struct bonding *bond = netdev_priv(dev); 4242 4243 if (TX_QUEUE_OVERRIDE(bond->params.mode)) { 4244 if (!bond_slave_override(bond, skb)) 4245 return NETDEV_TX_OK; 4246 } 4247 4248 switch (bond->params.mode) { 4249 case BOND_MODE_ROUNDROBIN: 4250 return bond_xmit_roundrobin(skb, dev); 4251 case BOND_MODE_ACTIVEBACKUP: 4252 return bond_xmit_activebackup(skb, dev); 4253 case BOND_MODE_XOR: 4254 return bond_xmit_xor(skb, dev); 4255 case BOND_MODE_BROADCAST: 4256 return bond_xmit_broadcast(skb, dev); 4257 case BOND_MODE_8023AD: 4258 return bond_3ad_xmit_xor(skb, dev); 4259 case BOND_MODE_ALB: 4260 case BOND_MODE_TLB: 4261 return bond_alb_xmit(skb, dev); 4262 default: 4263 /* Should never happen, mode already checked */ 4264 pr_err("%s: Error: Unknown bonding mode %d\n", 4265 dev->name, bond->params.mode); 4266 WARN_ON_ONCE(1); 4267 dev_kfree_skb(skb); 4268 return NETDEV_TX_OK; 4269 } 4270 } 4271 4272 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4273 { 4274 struct bonding *bond = netdev_priv(dev); 4275 netdev_tx_t ret = NETDEV_TX_OK; 4276 4277 /* 4278 * If we risk deadlock from transmitting this in the 4279 * netpoll path, tell netpoll to queue the frame for later tx 4280 */ 4281 if (is_netpoll_tx_blocked(dev)) 4282 return NETDEV_TX_BUSY; 4283 4284 read_lock(&bond->lock); 4285 4286 if (bond->slave_cnt) 4287 ret = __bond_start_xmit(skb, dev); 4288 else 4289 dev_kfree_skb(skb); 4290 4291 read_unlock(&bond->lock); 4292 4293 return ret; 4294 } 4295 4296 /* 4297 * set bond mode specific net device operations 4298 */ 4299 void bond_set_mode_ops(struct bonding *bond, int mode) 4300 { 4301 struct net_device *bond_dev = bond->dev; 4302 4303 switch (mode) { 4304 case BOND_MODE_ROUNDROBIN: 4305 break; 4306 case BOND_MODE_ACTIVEBACKUP: 4307 break; 4308 case BOND_MODE_XOR: 4309 bond_set_xmit_hash_policy(bond); 4310 break; 4311 case BOND_MODE_BROADCAST: 4312 break; 4313 case BOND_MODE_8023AD: 4314 bond_set_xmit_hash_policy(bond); 4315 break; 4316 case BOND_MODE_ALB: 4317 /* FALLTHRU */ 4318 case BOND_MODE_TLB: 4319 break; 4320 default: 4321 /* Should never happen, mode already checked */ 4322 pr_err("%s: Error: Unknown bonding mode %d\n", 4323 bond_dev->name, mode); 4324 break; 4325 } 4326 } 4327 4328 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 4329 struct ethtool_drvinfo *drvinfo) 4330 { 4331 strncpy(drvinfo->driver, DRV_NAME, 32); 4332 strncpy(drvinfo->version, DRV_VERSION, 32); 4333 snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION); 4334 } 4335 4336 static const struct ethtool_ops bond_ethtool_ops = { 4337 .get_drvinfo = bond_ethtool_get_drvinfo, 4338 .get_link = ethtool_op_get_link, 4339 }; 4340 4341 static const struct net_device_ops bond_netdev_ops = { 4342 .ndo_init = bond_init, 4343 .ndo_uninit = bond_uninit, 4344 .ndo_open = bond_open, 4345 .ndo_stop = bond_close, 4346 .ndo_start_xmit = bond_start_xmit, 4347 .ndo_select_queue = bond_select_queue, 4348 .ndo_get_stats64 = bond_get_stats, 4349 .ndo_do_ioctl = bond_do_ioctl, 4350 .ndo_set_multicast_list = bond_set_multicast_list, 4351 .ndo_change_mtu = bond_change_mtu, 4352 .ndo_set_mac_address = bond_set_mac_address, 4353 .ndo_neigh_setup = bond_neigh_setup, 4354 .ndo_vlan_rx_register = bond_vlan_rx_register, 4355 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 4356 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 4357 #ifdef CONFIG_NET_POLL_CONTROLLER 4358 .ndo_netpoll_setup = bond_netpoll_setup, 4359 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 4360 .ndo_poll_controller = bond_poll_controller, 4361 #endif 4362 .ndo_add_slave = bond_enslave, 4363 .ndo_del_slave = bond_release, 4364 .ndo_fix_features = bond_fix_features, 4365 }; 4366 4367 static void bond_destructor(struct net_device *bond_dev) 4368 { 4369 struct bonding *bond = netdev_priv(bond_dev); 4370 if (bond->wq) 4371 destroy_workqueue(bond->wq); 4372 free_netdev(bond_dev); 4373 } 4374 4375 static void bond_setup(struct net_device *bond_dev) 4376 { 4377 struct bonding *bond = netdev_priv(bond_dev); 4378 4379 /* initialize rwlocks */ 4380 rwlock_init(&bond->lock); 4381 rwlock_init(&bond->curr_slave_lock); 4382 4383 bond->params = bonding_defaults; 4384 4385 /* Initialize pointers */ 4386 bond->dev = bond_dev; 4387 INIT_LIST_HEAD(&bond->vlan_list); 4388 4389 /* Initialize the device entry points */ 4390 ether_setup(bond_dev); 4391 bond_dev->netdev_ops = &bond_netdev_ops; 4392 bond_dev->ethtool_ops = &bond_ethtool_ops; 4393 bond_set_mode_ops(bond, bond->params.mode); 4394 4395 bond_dev->destructor = bond_destructor; 4396 4397 /* Initialize the device options */ 4398 bond_dev->tx_queue_len = 0; 4399 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST; 4400 bond_dev->priv_flags |= IFF_BONDING; 4401 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 4402 4403 /* At first, we block adding VLANs. That's the only way to 4404 * prevent problems that occur when adding VLANs over an 4405 * empty bond. The block will be removed once non-challenged 4406 * slaves are enslaved. 4407 */ 4408 bond_dev->features |= NETIF_F_VLAN_CHALLENGED; 4409 4410 /* don't acquire bond device's netif_tx_lock when 4411 * transmitting */ 4412 bond_dev->features |= NETIF_F_LLTX; 4413 4414 /* By default, we declare the bond to be fully 4415 * VLAN hardware accelerated capable. Special 4416 * care is taken in the various xmit functions 4417 * when there are slaves that are not hw accel 4418 * capable 4419 */ 4420 4421 bond_dev->hw_features = BOND_VLAN_FEATURES | 4422 NETIF_F_HW_VLAN_TX | 4423 NETIF_F_HW_VLAN_RX | 4424 NETIF_F_HW_VLAN_FILTER; 4425 4426 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_NO_CSUM); 4427 bond_dev->features |= bond_dev->hw_features; 4428 } 4429 4430 static void bond_work_cancel_all(struct bonding *bond) 4431 { 4432 write_lock_bh(&bond->lock); 4433 bond->kill_timers = 1; 4434 write_unlock_bh(&bond->lock); 4435 4436 if (bond->params.miimon && delayed_work_pending(&bond->mii_work)) 4437 cancel_delayed_work(&bond->mii_work); 4438 4439 if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work)) 4440 cancel_delayed_work(&bond->arp_work); 4441 4442 if (bond->params.mode == BOND_MODE_ALB && 4443 delayed_work_pending(&bond->alb_work)) 4444 cancel_delayed_work(&bond->alb_work); 4445 4446 if (bond->params.mode == BOND_MODE_8023AD && 4447 delayed_work_pending(&bond->ad_work)) 4448 cancel_delayed_work(&bond->ad_work); 4449 4450 if (delayed_work_pending(&bond->mcast_work)) 4451 cancel_delayed_work(&bond->mcast_work); 4452 } 4453 4454 /* 4455 * Destroy a bonding device. 4456 * Must be under rtnl_lock when this function is called. 4457 */ 4458 static void bond_uninit(struct net_device *bond_dev) 4459 { 4460 struct bonding *bond = netdev_priv(bond_dev); 4461 struct vlan_entry *vlan, *tmp; 4462 4463 bond_netpoll_cleanup(bond_dev); 4464 4465 /* Release the bonded slaves */ 4466 bond_release_all(bond_dev); 4467 4468 list_del(&bond->bond_list); 4469 4470 bond_work_cancel_all(bond); 4471 4472 bond_remove_proc_entry(bond); 4473 4474 bond_debug_unregister(bond); 4475 4476 __hw_addr_flush(&bond->mc_list); 4477 4478 list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) { 4479 list_del(&vlan->vlan_list); 4480 kfree(vlan); 4481 } 4482 } 4483 4484 /*------------------------- Module initialization ---------------------------*/ 4485 4486 /* 4487 * Convert string input module parms. Accept either the 4488 * number of the mode or its string name. A bit complicated because 4489 * some mode names are substrings of other names, and calls from sysfs 4490 * may have whitespace in the name (trailing newlines, for example). 4491 */ 4492 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl) 4493 { 4494 int modeint = -1, i, rv; 4495 char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, }; 4496 4497 for (p = (char *)buf; *p; p++) 4498 if (!(isdigit(*p) || isspace(*p))) 4499 break; 4500 4501 if (*p) 4502 rv = sscanf(buf, "%20s", modestr); 4503 else 4504 rv = sscanf(buf, "%d", &modeint); 4505 4506 if (!rv) 4507 return -1; 4508 4509 for (i = 0; tbl[i].modename; i++) { 4510 if (modeint == tbl[i].mode) 4511 return tbl[i].mode; 4512 if (strcmp(modestr, tbl[i].modename) == 0) 4513 return tbl[i].mode; 4514 } 4515 4516 return -1; 4517 } 4518 4519 static int bond_check_params(struct bond_params *params) 4520 { 4521 int arp_validate_value, fail_over_mac_value, primary_reselect_value; 4522 4523 /* 4524 * Convert string parameters. 4525 */ 4526 if (mode) { 4527 bond_mode = bond_parse_parm(mode, bond_mode_tbl); 4528 if (bond_mode == -1) { 4529 pr_err("Error: Invalid bonding mode \"%s\"\n", 4530 mode == NULL ? "NULL" : mode); 4531 return -EINVAL; 4532 } 4533 } 4534 4535 if (xmit_hash_policy) { 4536 if ((bond_mode != BOND_MODE_XOR) && 4537 (bond_mode != BOND_MODE_8023AD)) { 4538 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 4539 bond_mode_name(bond_mode)); 4540 } else { 4541 xmit_hashtype = bond_parse_parm(xmit_hash_policy, 4542 xmit_hashtype_tbl); 4543 if (xmit_hashtype == -1) { 4544 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 4545 xmit_hash_policy == NULL ? "NULL" : 4546 xmit_hash_policy); 4547 return -EINVAL; 4548 } 4549 } 4550 } 4551 4552 if (lacp_rate) { 4553 if (bond_mode != BOND_MODE_8023AD) { 4554 pr_info("lacp_rate param is irrelevant in mode %s\n", 4555 bond_mode_name(bond_mode)); 4556 } else { 4557 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl); 4558 if (lacp_fast == -1) { 4559 pr_err("Error: Invalid lacp rate \"%s\"\n", 4560 lacp_rate == NULL ? "NULL" : lacp_rate); 4561 return -EINVAL; 4562 } 4563 } 4564 } 4565 4566 if (ad_select) { 4567 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl); 4568 if (params->ad_select == -1) { 4569 pr_err("Error: Invalid ad_select \"%s\"\n", 4570 ad_select == NULL ? "NULL" : ad_select); 4571 return -EINVAL; 4572 } 4573 4574 if (bond_mode != BOND_MODE_8023AD) { 4575 pr_warning("ad_select param only affects 802.3ad mode\n"); 4576 } 4577 } else { 4578 params->ad_select = BOND_AD_STABLE; 4579 } 4580 4581 if (max_bonds < 0) { 4582 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 4583 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 4584 max_bonds = BOND_DEFAULT_MAX_BONDS; 4585 } 4586 4587 if (miimon < 0) { 4588 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n", 4589 miimon, INT_MAX, BOND_LINK_MON_INTERV); 4590 miimon = BOND_LINK_MON_INTERV; 4591 } 4592 4593 if (updelay < 0) { 4594 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4595 updelay, INT_MAX); 4596 updelay = 0; 4597 } 4598 4599 if (downdelay < 0) { 4600 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4601 downdelay, INT_MAX); 4602 downdelay = 0; 4603 } 4604 4605 if ((use_carrier != 0) && (use_carrier != 1)) { 4606 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 4607 use_carrier); 4608 use_carrier = 1; 4609 } 4610 4611 if (num_peer_notif < 0 || num_peer_notif > 255) { 4612 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 4613 num_peer_notif); 4614 num_peer_notif = 1; 4615 } 4616 4617 /* reset values for 802.3ad */ 4618 if (bond_mode == BOND_MODE_8023AD) { 4619 if (!miimon) { 4620 pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n"); 4621 pr_warning("Forcing miimon to 100msec\n"); 4622 miimon = 100; 4623 } 4624 } 4625 4626 if (tx_queues < 1 || tx_queues > 255) { 4627 pr_warning("Warning: tx_queues (%d) should be between " 4628 "1 and 255, resetting to %d\n", 4629 tx_queues, BOND_DEFAULT_TX_QUEUES); 4630 tx_queues = BOND_DEFAULT_TX_QUEUES; 4631 } 4632 4633 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 4634 pr_warning("Warning: all_slaves_active module parameter (%d), " 4635 "not of valid value (0/1), so it was set to " 4636 "0\n", all_slaves_active); 4637 all_slaves_active = 0; 4638 } 4639 4640 if (resend_igmp < 0 || resend_igmp > 255) { 4641 pr_warning("Warning: resend_igmp (%d) should be between " 4642 "0 and 255, resetting to %d\n", 4643 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 4644 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 4645 } 4646 4647 /* reset values for TLB/ALB */ 4648 if ((bond_mode == BOND_MODE_TLB) || 4649 (bond_mode == BOND_MODE_ALB)) { 4650 if (!miimon) { 4651 pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure and link speed which are essential for TLB/ALB load balancing\n"); 4652 pr_warning("Forcing miimon to 100msec\n"); 4653 miimon = 100; 4654 } 4655 } 4656 4657 if (bond_mode == BOND_MODE_ALB) { 4658 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", 4659 updelay); 4660 } 4661 4662 if (!miimon) { 4663 if (updelay || downdelay) { 4664 /* just warn the user the up/down delay will have 4665 * no effect since miimon is zero... 4666 */ 4667 pr_warning("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", 4668 updelay, downdelay); 4669 } 4670 } else { 4671 /* don't allow arp monitoring */ 4672 if (arp_interval) { 4673 pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 4674 miimon, arp_interval); 4675 arp_interval = 0; 4676 } 4677 4678 if ((updelay % miimon) != 0) { 4679 pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 4680 updelay, miimon, 4681 (updelay / miimon) * miimon); 4682 } 4683 4684 updelay /= miimon; 4685 4686 if ((downdelay % miimon) != 0) { 4687 pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 4688 downdelay, miimon, 4689 (downdelay / miimon) * miimon); 4690 } 4691 4692 downdelay /= miimon; 4693 } 4694 4695 if (arp_interval < 0) { 4696 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n", 4697 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV); 4698 arp_interval = BOND_LINK_ARP_INTERV; 4699 } 4700 4701 for (arp_ip_count = 0; 4702 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count]; 4703 arp_ip_count++) { 4704 /* not complete check, but should be good enough to 4705 catch mistakes */ 4706 if (!isdigit(arp_ip_target[arp_ip_count][0])) { 4707 pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 4708 arp_ip_target[arp_ip_count]); 4709 arp_interval = 0; 4710 } else { 4711 __be32 ip = in_aton(arp_ip_target[arp_ip_count]); 4712 arp_target[arp_ip_count] = ip; 4713 } 4714 } 4715 4716 if (arp_interval && !arp_ip_count) { 4717 /* don't allow arping if no arp_ip_target given... */ 4718 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 4719 arp_interval); 4720 arp_interval = 0; 4721 } 4722 4723 if (arp_validate) { 4724 if (bond_mode != BOND_MODE_ACTIVEBACKUP) { 4725 pr_err("arp_validate only supported in active-backup mode\n"); 4726 return -EINVAL; 4727 } 4728 if (!arp_interval) { 4729 pr_err("arp_validate requires arp_interval\n"); 4730 return -EINVAL; 4731 } 4732 4733 arp_validate_value = bond_parse_parm(arp_validate, 4734 arp_validate_tbl); 4735 if (arp_validate_value == -1) { 4736 pr_err("Error: invalid arp_validate \"%s\"\n", 4737 arp_validate == NULL ? "NULL" : arp_validate); 4738 return -EINVAL; 4739 } 4740 } else 4741 arp_validate_value = 0; 4742 4743 if (miimon) { 4744 pr_info("MII link monitoring set to %d ms\n", miimon); 4745 } else if (arp_interval) { 4746 int i; 4747 4748 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 4749 arp_interval, 4750 arp_validate_tbl[arp_validate_value].modename, 4751 arp_ip_count); 4752 4753 for (i = 0; i < arp_ip_count; i++) 4754 pr_info(" %s", arp_ip_target[i]); 4755 4756 pr_info("\n"); 4757 4758 } else if (max_bonds) { 4759 /* miimon and arp_interval not set, we need one so things 4760 * work as expected, see bonding.txt for details 4761 */ 4762 pr_warning("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"); 4763 } 4764 4765 if (primary && !USES_PRIMARY(bond_mode)) { 4766 /* currently, using a primary only makes sense 4767 * in active backup, TLB or ALB modes 4768 */ 4769 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n", 4770 primary, bond_mode_name(bond_mode)); 4771 primary = NULL; 4772 } 4773 4774 if (primary && primary_reselect) { 4775 primary_reselect_value = bond_parse_parm(primary_reselect, 4776 pri_reselect_tbl); 4777 if (primary_reselect_value == -1) { 4778 pr_err("Error: Invalid primary_reselect \"%s\"\n", 4779 primary_reselect == 4780 NULL ? "NULL" : primary_reselect); 4781 return -EINVAL; 4782 } 4783 } else { 4784 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 4785 } 4786 4787 if (fail_over_mac) { 4788 fail_over_mac_value = bond_parse_parm(fail_over_mac, 4789 fail_over_mac_tbl); 4790 if (fail_over_mac_value == -1) { 4791 pr_err("Error: invalid fail_over_mac \"%s\"\n", 4792 arp_validate == NULL ? "NULL" : arp_validate); 4793 return -EINVAL; 4794 } 4795 4796 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 4797 pr_warning("Warning: fail_over_mac only affects active-backup mode.\n"); 4798 } else { 4799 fail_over_mac_value = BOND_FOM_NONE; 4800 } 4801 4802 /* fill params struct with the proper values */ 4803 params->mode = bond_mode; 4804 params->xmit_policy = xmit_hashtype; 4805 params->miimon = miimon; 4806 params->num_peer_notif = num_peer_notif; 4807 params->arp_interval = arp_interval; 4808 params->arp_validate = arp_validate_value; 4809 params->updelay = updelay; 4810 params->downdelay = downdelay; 4811 params->use_carrier = use_carrier; 4812 params->lacp_fast = lacp_fast; 4813 params->primary[0] = 0; 4814 params->primary_reselect = primary_reselect_value; 4815 params->fail_over_mac = fail_over_mac_value; 4816 params->tx_queues = tx_queues; 4817 params->all_slaves_active = all_slaves_active; 4818 params->resend_igmp = resend_igmp; 4819 4820 if (primary) { 4821 strncpy(params->primary, primary, IFNAMSIZ); 4822 params->primary[IFNAMSIZ - 1] = 0; 4823 } 4824 4825 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 4826 4827 return 0; 4828 } 4829 4830 static struct lock_class_key bonding_netdev_xmit_lock_key; 4831 static struct lock_class_key bonding_netdev_addr_lock_key; 4832 4833 static void bond_set_lockdep_class_one(struct net_device *dev, 4834 struct netdev_queue *txq, 4835 void *_unused) 4836 { 4837 lockdep_set_class(&txq->_xmit_lock, 4838 &bonding_netdev_xmit_lock_key); 4839 } 4840 4841 static void bond_set_lockdep_class(struct net_device *dev) 4842 { 4843 lockdep_set_class(&dev->addr_list_lock, 4844 &bonding_netdev_addr_lock_key); 4845 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL); 4846 } 4847 4848 /* 4849 * Called from registration process 4850 */ 4851 static int bond_init(struct net_device *bond_dev) 4852 { 4853 struct bonding *bond = netdev_priv(bond_dev); 4854 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 4855 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); 4856 4857 pr_debug("Begin bond_init for %s\n", bond_dev->name); 4858 4859 /* 4860 * Initialize locks that may be required during 4861 * en/deslave operations. All of the bond_open work 4862 * (of which this is part) should really be moved to 4863 * a phase prior to dev_open 4864 */ 4865 spin_lock_init(&(bond_info->tx_hashtbl_lock)); 4866 spin_lock_init(&(bond_info->rx_hashtbl_lock)); 4867 4868 bond->wq = create_singlethread_workqueue(bond_dev->name); 4869 if (!bond->wq) 4870 return -ENOMEM; 4871 4872 bond_set_lockdep_class(bond_dev); 4873 4874 bond_create_proc_entry(bond); 4875 list_add_tail(&bond->bond_list, &bn->dev_list); 4876 4877 bond_prepare_sysfs_group(bond); 4878 4879 bond_debug_register(bond); 4880 4881 __hw_addr_init(&bond->mc_list); 4882 return 0; 4883 } 4884 4885 static int bond_validate(struct nlattr *tb[], struct nlattr *data[]) 4886 { 4887 if (tb[IFLA_ADDRESS]) { 4888 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 4889 return -EINVAL; 4890 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 4891 return -EADDRNOTAVAIL; 4892 } 4893 return 0; 4894 } 4895 4896 static struct rtnl_link_ops bond_link_ops __read_mostly = { 4897 .kind = "bond", 4898 .priv_size = sizeof(struct bonding), 4899 .setup = bond_setup, 4900 .validate = bond_validate, 4901 }; 4902 4903 /* Create a new bond based on the specified name and bonding parameters. 4904 * If name is NULL, obtain a suitable "bond%d" name for us. 4905 * Caller must NOT hold rtnl_lock; we need to release it here before we 4906 * set up our sysfs entries. 4907 */ 4908 int bond_create(struct net *net, const char *name) 4909 { 4910 struct net_device *bond_dev; 4911 int res; 4912 4913 rtnl_lock(); 4914 4915 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 4916 name ? name : "bond%d", 4917 bond_setup, tx_queues); 4918 if (!bond_dev) { 4919 pr_err("%s: eek! can't alloc netdev!\n", name); 4920 rtnl_unlock(); 4921 return -ENOMEM; 4922 } 4923 4924 dev_net_set(bond_dev, net); 4925 bond_dev->rtnl_link_ops = &bond_link_ops; 4926 4927 res = register_netdevice(bond_dev); 4928 4929 netif_carrier_off(bond_dev); 4930 4931 rtnl_unlock(); 4932 if (res < 0) 4933 bond_destructor(bond_dev); 4934 return res; 4935 } 4936 4937 static int __net_init bond_net_init(struct net *net) 4938 { 4939 struct bond_net *bn = net_generic(net, bond_net_id); 4940 4941 bn->net = net; 4942 INIT_LIST_HEAD(&bn->dev_list); 4943 4944 bond_create_proc_dir(bn); 4945 4946 return 0; 4947 } 4948 4949 static void __net_exit bond_net_exit(struct net *net) 4950 { 4951 struct bond_net *bn = net_generic(net, bond_net_id); 4952 4953 bond_destroy_proc_dir(bn); 4954 } 4955 4956 static struct pernet_operations bond_net_ops = { 4957 .init = bond_net_init, 4958 .exit = bond_net_exit, 4959 .id = &bond_net_id, 4960 .size = sizeof(struct bond_net), 4961 }; 4962 4963 static int __init bonding_init(void) 4964 { 4965 int i; 4966 int res; 4967 4968 pr_info("%s", bond_version); 4969 4970 res = bond_check_params(&bonding_defaults); 4971 if (res) 4972 goto out; 4973 4974 res = register_pernet_subsys(&bond_net_ops); 4975 if (res) 4976 goto out; 4977 4978 res = rtnl_link_register(&bond_link_ops); 4979 if (res) 4980 goto err_link; 4981 4982 bond_create_debugfs(); 4983 4984 for (i = 0; i < max_bonds; i++) { 4985 res = bond_create(&init_net, NULL); 4986 if (res) 4987 goto err; 4988 } 4989 4990 res = bond_create_sysfs(); 4991 if (res) 4992 goto err; 4993 4994 register_netdevice_notifier(&bond_netdev_notifier); 4995 register_inetaddr_notifier(&bond_inetaddr_notifier); 4996 out: 4997 return res; 4998 err: 4999 rtnl_link_unregister(&bond_link_ops); 5000 err_link: 5001 unregister_pernet_subsys(&bond_net_ops); 5002 goto out; 5003 5004 } 5005 5006 static void __exit bonding_exit(void) 5007 { 5008 unregister_netdevice_notifier(&bond_netdev_notifier); 5009 unregister_inetaddr_notifier(&bond_inetaddr_notifier); 5010 5011 bond_destroy_sysfs(); 5012 bond_destroy_debugfs(); 5013 5014 rtnl_link_unregister(&bond_link_ops); 5015 unregister_pernet_subsys(&bond_net_ops); 5016 5017 #ifdef CONFIG_NET_POLL_CONTROLLER 5018 /* 5019 * Make sure we don't have an imbalance on our netpoll blocking 5020 */ 5021 WARN_ON(atomic_read(&netpoll_block_tx)); 5022 #endif 5023 } 5024 5025 module_init(bonding_init); 5026 module_exit(bonding_exit); 5027 MODULE_LICENSE("GPL"); 5028 MODULE_VERSION(DRV_VERSION); 5029 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION); 5030 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 5031 MODULE_ALIAS_RTNL_LINK("bond"); 5032