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 err = __netpoll_setup(np); 1301 if (err) { 1302 kfree(np); 1303 goto out; 1304 } 1305 slave->np = np; 1306 out: 1307 return err; 1308 } 1309 static inline void slave_disable_netpoll(struct slave *slave) 1310 { 1311 struct netpoll *np = slave->np; 1312 1313 if (!np) 1314 return; 1315 1316 slave->np = NULL; 1317 synchronize_rcu_bh(); 1318 __netpoll_cleanup(np); 1319 kfree(np); 1320 } 1321 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev) 1322 { 1323 if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL) 1324 return false; 1325 if (!slave_dev->netdev_ops->ndo_poll_controller) 1326 return false; 1327 return true; 1328 } 1329 1330 static void bond_poll_controller(struct net_device *bond_dev) 1331 { 1332 } 1333 1334 static void __bond_netpoll_cleanup(struct bonding *bond) 1335 { 1336 struct slave *slave; 1337 int i; 1338 1339 bond_for_each_slave(bond, slave, i) 1340 if (IS_UP(slave->dev)) 1341 slave_disable_netpoll(slave); 1342 } 1343 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1344 { 1345 struct bonding *bond = netdev_priv(bond_dev); 1346 1347 read_lock(&bond->lock); 1348 __bond_netpoll_cleanup(bond); 1349 read_unlock(&bond->lock); 1350 } 1351 1352 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) 1353 { 1354 struct bonding *bond = netdev_priv(dev); 1355 struct slave *slave; 1356 int i, err = 0; 1357 1358 read_lock(&bond->lock); 1359 bond_for_each_slave(bond, slave, i) { 1360 err = slave_enable_netpoll(slave); 1361 if (err) { 1362 __bond_netpoll_cleanup(bond); 1363 break; 1364 } 1365 } 1366 read_unlock(&bond->lock); 1367 return err; 1368 } 1369 1370 static struct netpoll_info *bond_netpoll_info(struct bonding *bond) 1371 { 1372 return bond->dev->npinfo; 1373 } 1374 1375 #else 1376 static inline int slave_enable_netpoll(struct slave *slave) 1377 { 1378 return 0; 1379 } 1380 static inline void slave_disable_netpoll(struct slave *slave) 1381 { 1382 } 1383 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1384 { 1385 } 1386 #endif 1387 1388 /*---------------------------------- IOCTL ----------------------------------*/ 1389 1390 static int bond_sethwaddr(struct net_device *bond_dev, 1391 struct net_device *slave_dev) 1392 { 1393 pr_debug("bond_dev=%p\n", bond_dev); 1394 pr_debug("slave_dev=%p\n", slave_dev); 1395 pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len); 1396 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len); 1397 return 0; 1398 } 1399 1400 static u32 bond_fix_features(struct net_device *dev, u32 features) 1401 { 1402 struct slave *slave; 1403 struct bonding *bond = netdev_priv(dev); 1404 u32 mask; 1405 int i; 1406 1407 read_lock(&bond->lock); 1408 1409 if (!bond->first_slave) { 1410 /* Disable adding VLANs to empty bond. But why? --mq */ 1411 features |= NETIF_F_VLAN_CHALLENGED; 1412 goto out; 1413 } 1414 1415 mask = features; 1416 features &= ~NETIF_F_ONE_FOR_ALL; 1417 features |= NETIF_F_ALL_FOR_ALL; 1418 1419 bond_for_each_slave(bond, slave, i) { 1420 features = netdev_increment_features(features, 1421 slave->dev->features, 1422 mask); 1423 } 1424 1425 out: 1426 read_unlock(&bond->lock); 1427 return features; 1428 } 1429 1430 #define BOND_VLAN_FEATURES (NETIF_F_ALL_TX_OFFLOADS | \ 1431 NETIF_F_SOFT_FEATURES | \ 1432 NETIF_F_LRO) 1433 1434 static void bond_compute_features(struct bonding *bond) 1435 { 1436 struct slave *slave; 1437 struct net_device *bond_dev = bond->dev; 1438 u32 vlan_features = BOND_VLAN_FEATURES; 1439 unsigned short max_hard_header_len = ETH_HLEN; 1440 int i; 1441 1442 read_lock(&bond->lock); 1443 1444 if (!bond->first_slave) 1445 goto done; 1446 1447 bond_for_each_slave(bond, slave, i) { 1448 vlan_features = netdev_increment_features(vlan_features, 1449 slave->dev->vlan_features, BOND_VLAN_FEATURES); 1450 1451 if (slave->dev->hard_header_len > max_hard_header_len) 1452 max_hard_header_len = slave->dev->hard_header_len; 1453 } 1454 1455 done: 1456 bond_dev->vlan_features = vlan_features; 1457 bond_dev->hard_header_len = max_hard_header_len; 1458 1459 read_unlock(&bond->lock); 1460 1461 netdev_change_features(bond_dev); 1462 } 1463 1464 static void bond_setup_by_slave(struct net_device *bond_dev, 1465 struct net_device *slave_dev) 1466 { 1467 struct bonding *bond = netdev_priv(bond_dev); 1468 1469 bond_dev->header_ops = slave_dev->header_ops; 1470 1471 bond_dev->type = slave_dev->type; 1472 bond_dev->hard_header_len = slave_dev->hard_header_len; 1473 bond_dev->addr_len = slave_dev->addr_len; 1474 1475 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1476 slave_dev->addr_len); 1477 bond->setup_by_slave = 1; 1478 } 1479 1480 /* On bonding slaves other than the currently active slave, suppress 1481 * duplicates except for alb non-mcast/bcast. 1482 */ 1483 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1484 struct slave *slave, 1485 struct bonding *bond) 1486 { 1487 if (bond_is_slave_inactive(slave)) { 1488 if (bond->params.mode == BOND_MODE_ALB && 1489 skb->pkt_type != PACKET_BROADCAST && 1490 skb->pkt_type != PACKET_MULTICAST) 1491 return false; 1492 return true; 1493 } 1494 return false; 1495 } 1496 1497 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1498 { 1499 struct sk_buff *skb = *pskb; 1500 struct slave *slave; 1501 struct bonding *bond; 1502 1503 skb = skb_share_check(skb, GFP_ATOMIC); 1504 if (unlikely(!skb)) 1505 return RX_HANDLER_CONSUMED; 1506 1507 *pskb = skb; 1508 1509 slave = bond_slave_get_rcu(skb->dev); 1510 bond = slave->bond; 1511 1512 if (bond->params.arp_interval) 1513 slave->dev->last_rx = jiffies; 1514 1515 if (bond->recv_probe) { 1516 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); 1517 1518 if (likely(nskb)) { 1519 bond->recv_probe(nskb, bond, slave); 1520 dev_kfree_skb(nskb); 1521 } 1522 } 1523 1524 if (bond_should_deliver_exact_match(skb, slave, bond)) { 1525 return RX_HANDLER_EXACT; 1526 } 1527 1528 skb->dev = bond->dev; 1529 1530 if (bond->params.mode == BOND_MODE_ALB && 1531 bond->dev->priv_flags & IFF_BRIDGE_PORT && 1532 skb->pkt_type == PACKET_HOST) { 1533 1534 if (unlikely(skb_cow_head(skb, 1535 skb->data - skb_mac_header(skb)))) { 1536 kfree_skb(skb); 1537 return RX_HANDLER_CONSUMED; 1538 } 1539 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN); 1540 } 1541 1542 return RX_HANDLER_ANOTHER; 1543 } 1544 1545 /* enslave device <slave> to bond device <master> */ 1546 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev) 1547 { 1548 struct bonding *bond = netdev_priv(bond_dev); 1549 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1550 struct slave *new_slave = NULL; 1551 struct netdev_hw_addr *ha; 1552 struct sockaddr addr; 1553 int link_reporting; 1554 int res = 0; 1555 1556 if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL && 1557 slave_ops->ndo_do_ioctl == NULL) { 1558 pr_warning("%s: Warning: no link monitoring support for %s\n", 1559 bond_dev->name, slave_dev->name); 1560 } 1561 1562 /* already enslaved */ 1563 if (slave_dev->flags & IFF_SLAVE) { 1564 pr_debug("Error, Device was already enslaved\n"); 1565 return -EBUSY; 1566 } 1567 1568 /* vlan challenged mutual exclusion */ 1569 /* no need to lock since we're protected by rtnl_lock */ 1570 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1571 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name); 1572 if (bond->vlgrp) { 1573 pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n", 1574 bond_dev->name, slave_dev->name, bond_dev->name); 1575 return -EPERM; 1576 } else { 1577 pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n", 1578 bond_dev->name, slave_dev->name, 1579 slave_dev->name, bond_dev->name); 1580 } 1581 } else { 1582 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name); 1583 } 1584 1585 /* 1586 * Old ifenslave binaries are no longer supported. These can 1587 * be identified with moderate accuracy by the state of the slave: 1588 * the current ifenslave will set the interface down prior to 1589 * enslaving it; the old ifenslave will not. 1590 */ 1591 if ((slave_dev->flags & IFF_UP)) { 1592 pr_err("%s is up. This may be due to an out of date ifenslave.\n", 1593 slave_dev->name); 1594 res = -EPERM; 1595 goto err_undo_flags; 1596 } 1597 1598 /* set bonding device ether type by slave - bonding netdevices are 1599 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1600 * there is a need to override some of the type dependent attribs/funcs. 1601 * 1602 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1603 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1604 */ 1605 if (bond->slave_cnt == 0) { 1606 if (bond_dev->type != slave_dev->type) { 1607 pr_debug("%s: change device type from %d to %d\n", 1608 bond_dev->name, 1609 bond_dev->type, slave_dev->type); 1610 1611 res = netdev_bonding_change(bond_dev, 1612 NETDEV_PRE_TYPE_CHANGE); 1613 res = notifier_to_errno(res); 1614 if (res) { 1615 pr_err("%s: refused to change device type\n", 1616 bond_dev->name); 1617 res = -EBUSY; 1618 goto err_undo_flags; 1619 } 1620 1621 /* Flush unicast and multicast addresses */ 1622 dev_uc_flush(bond_dev); 1623 dev_mc_flush(bond_dev); 1624 1625 if (slave_dev->type != ARPHRD_ETHER) 1626 bond_setup_by_slave(bond_dev, slave_dev); 1627 else 1628 ether_setup(bond_dev); 1629 1630 netdev_bonding_change(bond_dev, 1631 NETDEV_POST_TYPE_CHANGE); 1632 } 1633 } else if (bond_dev->type != slave_dev->type) { 1634 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n", 1635 slave_dev->name, 1636 slave_dev->type, bond_dev->type); 1637 res = -EINVAL; 1638 goto err_undo_flags; 1639 } 1640 1641 if (slave_ops->ndo_set_mac_address == NULL) { 1642 if (bond->slave_cnt == 0) { 1643 pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.", 1644 bond_dev->name); 1645 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1646 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1647 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", 1648 bond_dev->name); 1649 res = -EOPNOTSUPP; 1650 goto err_undo_flags; 1651 } 1652 } 1653 1654 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1655 1656 /* If this is the first slave, then we need to set the master's hardware 1657 * address to be the same as the slave's. */ 1658 if (is_zero_ether_addr(bond->dev->dev_addr)) 1659 memcpy(bond->dev->dev_addr, slave_dev->dev_addr, 1660 slave_dev->addr_len); 1661 1662 1663 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL); 1664 if (!new_slave) { 1665 res = -ENOMEM; 1666 goto err_undo_flags; 1667 } 1668 1669 /* 1670 * Set the new_slave's queue_id to be zero. Queue ID mapping 1671 * is set via sysfs or module option if desired. 1672 */ 1673 new_slave->queue_id = 0; 1674 1675 /* Save slave's original mtu and then set it to match the bond */ 1676 new_slave->original_mtu = slave_dev->mtu; 1677 res = dev_set_mtu(slave_dev, bond->dev->mtu); 1678 if (res) { 1679 pr_debug("Error %d calling dev_set_mtu\n", res); 1680 goto err_free; 1681 } 1682 1683 /* 1684 * Save slave's original ("permanent") mac address for modes 1685 * that need it, and for restoring it upon release, and then 1686 * set it to the master's address 1687 */ 1688 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN); 1689 1690 if (!bond->params.fail_over_mac) { 1691 /* 1692 * Set slave to master's mac address. The application already 1693 * set the master's mac address to that of the first slave 1694 */ 1695 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 1696 addr.sa_family = slave_dev->type; 1697 res = dev_set_mac_address(slave_dev, &addr); 1698 if (res) { 1699 pr_debug("Error %d calling set_mac_address\n", res); 1700 goto err_restore_mtu; 1701 } 1702 } 1703 1704 res = netdev_set_bond_master(slave_dev, bond_dev); 1705 if (res) { 1706 pr_debug("Error %d calling netdev_set_bond_master\n", res); 1707 goto err_restore_mac; 1708 } 1709 1710 /* open the slave since the application closed it */ 1711 res = dev_open(slave_dev); 1712 if (res) { 1713 pr_debug("Opening slave %s failed\n", slave_dev->name); 1714 goto err_unset_master; 1715 } 1716 1717 new_slave->bond = bond; 1718 new_slave->dev = slave_dev; 1719 slave_dev->priv_flags |= IFF_BONDING; 1720 1721 if (bond_is_lb(bond)) { 1722 /* bond_alb_init_slave() must be called before all other stages since 1723 * it might fail and we do not want to have to undo everything 1724 */ 1725 res = bond_alb_init_slave(bond, new_slave); 1726 if (res) 1727 goto err_close; 1728 } 1729 1730 /* If the mode USES_PRIMARY, then the new slave gets the 1731 * master's promisc (and mc) settings only if it becomes the 1732 * curr_active_slave, and that is taken care of later when calling 1733 * bond_change_active() 1734 */ 1735 if (!USES_PRIMARY(bond->params.mode)) { 1736 /* set promiscuity level to new slave */ 1737 if (bond_dev->flags & IFF_PROMISC) { 1738 res = dev_set_promiscuity(slave_dev, 1); 1739 if (res) 1740 goto err_close; 1741 } 1742 1743 /* set allmulti level to new slave */ 1744 if (bond_dev->flags & IFF_ALLMULTI) { 1745 res = dev_set_allmulti(slave_dev, 1); 1746 if (res) 1747 goto err_close; 1748 } 1749 1750 netif_addr_lock_bh(bond_dev); 1751 /* upload master's mc_list to new slave */ 1752 netdev_for_each_mc_addr(ha, bond_dev) 1753 dev_mc_add(slave_dev, ha->addr); 1754 netif_addr_unlock_bh(bond_dev); 1755 } 1756 1757 if (bond->params.mode == BOND_MODE_8023AD) { 1758 /* add lacpdu mc addr to mc list */ 1759 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 1760 1761 dev_mc_add(slave_dev, lacpdu_multicast); 1762 } 1763 1764 bond_add_vlans_on_slave(bond, slave_dev); 1765 1766 write_lock_bh(&bond->lock); 1767 1768 bond_attach_slave(bond, new_slave); 1769 1770 new_slave->delay = 0; 1771 new_slave->link_failure_count = 0; 1772 1773 write_unlock_bh(&bond->lock); 1774 1775 bond_compute_features(bond); 1776 1777 read_lock(&bond->lock); 1778 1779 new_slave->last_arp_rx = jiffies; 1780 1781 if (bond->params.miimon && !bond->params.use_carrier) { 1782 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 1783 1784 if ((link_reporting == -1) && !bond->params.arp_interval) { 1785 /* 1786 * miimon is set but a bonded network driver 1787 * does not support ETHTOOL/MII and 1788 * arp_interval is not set. Note: if 1789 * use_carrier is enabled, we will never go 1790 * here (because netif_carrier is always 1791 * supported); thus, we don't need to change 1792 * the messages for netif_carrier. 1793 */ 1794 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", 1795 bond_dev->name, slave_dev->name); 1796 } else if (link_reporting == -1) { 1797 /* unable get link status using mii/ethtool */ 1798 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", 1799 bond_dev->name, slave_dev->name); 1800 } 1801 } 1802 1803 /* check for initial state */ 1804 if (!bond->params.miimon || 1805 (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) { 1806 if (bond->params.updelay) { 1807 pr_debug("Initial state of slave_dev is BOND_LINK_BACK\n"); 1808 new_slave->link = BOND_LINK_BACK; 1809 new_slave->delay = bond->params.updelay; 1810 } else { 1811 pr_debug("Initial state of slave_dev is BOND_LINK_UP\n"); 1812 new_slave->link = BOND_LINK_UP; 1813 } 1814 new_slave->jiffies = jiffies; 1815 } else { 1816 pr_debug("Initial state of slave_dev is BOND_LINK_DOWN\n"); 1817 new_slave->link = BOND_LINK_DOWN; 1818 } 1819 1820 if (bond_update_speed_duplex(new_slave) && 1821 (new_slave->link != BOND_LINK_DOWN)) { 1822 pr_warning("%s: Warning: failed to get speed and duplex from %s, assumed to be 100Mb/sec and Full.\n", 1823 bond_dev->name, new_slave->dev->name); 1824 1825 if (bond->params.mode == BOND_MODE_8023AD) { 1826 pr_warning("%s: Warning: Operation of 802.3ad mode requires ETHTOOL support in base driver for proper aggregator selection.\n", 1827 bond_dev->name); 1828 } 1829 } 1830 1831 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) { 1832 /* if there is a primary slave, remember it */ 1833 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 1834 bond->primary_slave = new_slave; 1835 bond->force_primary = true; 1836 } 1837 } 1838 1839 write_lock_bh(&bond->curr_slave_lock); 1840 1841 switch (bond->params.mode) { 1842 case BOND_MODE_ACTIVEBACKUP: 1843 bond_set_slave_inactive_flags(new_slave); 1844 bond_select_active_slave(bond); 1845 break; 1846 case BOND_MODE_8023AD: 1847 /* in 802.3ad mode, the internal mechanism 1848 * will activate the slaves in the selected 1849 * aggregator 1850 */ 1851 bond_set_slave_inactive_flags(new_slave); 1852 /* if this is the first slave */ 1853 if (bond->slave_cnt == 1) { 1854 SLAVE_AD_INFO(new_slave).id = 1; 1855 /* Initialize AD with the number of times that the AD timer is called in 1 second 1856 * can be called only after the mac address of the bond is set 1857 */ 1858 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL, 1859 bond->params.lacp_fast); 1860 } else { 1861 SLAVE_AD_INFO(new_slave).id = 1862 SLAVE_AD_INFO(new_slave->prev).id + 1; 1863 } 1864 1865 bond_3ad_bind_slave(new_slave); 1866 break; 1867 case BOND_MODE_TLB: 1868 case BOND_MODE_ALB: 1869 bond_set_active_slave(new_slave); 1870 bond_set_slave_inactive_flags(new_slave); 1871 bond_select_active_slave(bond); 1872 break; 1873 default: 1874 pr_debug("This slave is always active in trunk mode\n"); 1875 1876 /* always active in trunk mode */ 1877 bond_set_active_slave(new_slave); 1878 1879 /* In trunking mode there is little meaning to curr_active_slave 1880 * anyway (it holds no special properties of the bond device), 1881 * so we can change it without calling change_active_interface() 1882 */ 1883 if (!bond->curr_active_slave) 1884 bond->curr_active_slave = new_slave; 1885 1886 break; 1887 } /* switch(bond_mode) */ 1888 1889 write_unlock_bh(&bond->curr_slave_lock); 1890 1891 bond_set_carrier(bond); 1892 1893 #ifdef CONFIG_NET_POLL_CONTROLLER 1894 slave_dev->npinfo = bond_netpoll_info(bond); 1895 if (slave_dev->npinfo) { 1896 if (slave_enable_netpoll(new_slave)) { 1897 read_unlock(&bond->lock); 1898 pr_info("Error, %s: master_dev is using netpoll, " 1899 "but new slave device does not support netpoll.\n", 1900 bond_dev->name); 1901 res = -EBUSY; 1902 goto err_close; 1903 } 1904 } 1905 #endif 1906 1907 read_unlock(&bond->lock); 1908 1909 res = bond_create_slave_symlinks(bond_dev, slave_dev); 1910 if (res) 1911 goto err_close; 1912 1913 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 1914 new_slave); 1915 if (res) { 1916 pr_debug("Error %d calling netdev_rx_handler_register\n", res); 1917 goto err_dest_symlinks; 1918 } 1919 1920 pr_info("%s: enslaving %s as a%s interface with a%s link.\n", 1921 bond_dev->name, slave_dev->name, 1922 bond_is_active_slave(new_slave) ? "n active" : " backup", 1923 new_slave->link != BOND_LINK_DOWN ? "n up" : " down"); 1924 1925 /* enslave is successful */ 1926 return 0; 1927 1928 /* Undo stages on error */ 1929 err_dest_symlinks: 1930 bond_destroy_slave_symlinks(bond_dev, slave_dev); 1931 1932 err_close: 1933 dev_close(slave_dev); 1934 1935 err_unset_master: 1936 netdev_set_bond_master(slave_dev, NULL); 1937 1938 err_restore_mac: 1939 if (!bond->params.fail_over_mac) { 1940 /* XXX TODO - fom follow mode needs to change master's 1941 * MAC if this slave's MAC is in use by the bond, or at 1942 * least print a warning. 1943 */ 1944 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN); 1945 addr.sa_family = slave_dev->type; 1946 dev_set_mac_address(slave_dev, &addr); 1947 } 1948 1949 err_restore_mtu: 1950 dev_set_mtu(slave_dev, new_slave->original_mtu); 1951 1952 err_free: 1953 kfree(new_slave); 1954 1955 err_undo_flags: 1956 bond_compute_features(bond); 1957 1958 return res; 1959 } 1960 1961 /* 1962 * Try to release the slave device <slave> from the bond device <master> 1963 * It is legal to access curr_active_slave without a lock because all the function 1964 * is write-locked. 1965 * 1966 * The rules for slave state should be: 1967 * for Active/Backup: 1968 * Active stays on all backups go down 1969 * for Bonded connections: 1970 * The first up interface should be left on and all others downed. 1971 */ 1972 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 1973 { 1974 struct bonding *bond = netdev_priv(bond_dev); 1975 struct slave *slave, *oldcurrent; 1976 struct sockaddr addr; 1977 u32 old_features = bond_dev->features; 1978 1979 /* slave is not a slave or master is not master of this slave */ 1980 if (!(slave_dev->flags & IFF_SLAVE) || 1981 (slave_dev->master != bond_dev)) { 1982 pr_err("%s: Error: cannot release %s.\n", 1983 bond_dev->name, slave_dev->name); 1984 return -EINVAL; 1985 } 1986 1987 block_netpoll_tx(); 1988 netdev_bonding_change(bond_dev, NETDEV_RELEASE); 1989 write_lock_bh(&bond->lock); 1990 1991 slave = bond_get_slave_by_dev(bond, slave_dev); 1992 if (!slave) { 1993 /* not a slave of this bond */ 1994 pr_info("%s: %s not enslaved\n", 1995 bond_dev->name, slave_dev->name); 1996 write_unlock_bh(&bond->lock); 1997 unblock_netpoll_tx(); 1998 return -EINVAL; 1999 } 2000 2001 /* unregister rx_handler early so bond_handle_frame wouldn't be called 2002 * for this slave anymore. 2003 */ 2004 netdev_rx_handler_unregister(slave_dev); 2005 write_unlock_bh(&bond->lock); 2006 synchronize_net(); 2007 write_lock_bh(&bond->lock); 2008 2009 if (!bond->params.fail_over_mac) { 2010 if (!compare_ether_addr(bond_dev->dev_addr, slave->perm_hwaddr) && 2011 bond->slave_cnt > 1) 2012 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", 2013 bond_dev->name, slave_dev->name, 2014 slave->perm_hwaddr, 2015 bond_dev->name, slave_dev->name); 2016 } 2017 2018 /* Inform AD package of unbinding of slave. */ 2019 if (bond->params.mode == BOND_MODE_8023AD) { 2020 /* must be called before the slave is 2021 * detached from the list 2022 */ 2023 bond_3ad_unbind_slave(slave); 2024 } 2025 2026 pr_info("%s: releasing %s interface %s\n", 2027 bond_dev->name, 2028 bond_is_active_slave(slave) ? "active" : "backup", 2029 slave_dev->name); 2030 2031 oldcurrent = bond->curr_active_slave; 2032 2033 bond->current_arp_slave = NULL; 2034 2035 /* release the slave from its bond */ 2036 bond_detach_slave(bond, slave); 2037 2038 if (bond->primary_slave == slave) 2039 bond->primary_slave = NULL; 2040 2041 if (oldcurrent == slave) 2042 bond_change_active_slave(bond, NULL); 2043 2044 if (bond_is_lb(bond)) { 2045 /* Must be called only after the slave has been 2046 * detached from the list and the curr_active_slave 2047 * has been cleared (if our_slave == old_current), 2048 * but before a new active slave is selected. 2049 */ 2050 write_unlock_bh(&bond->lock); 2051 bond_alb_deinit_slave(bond, slave); 2052 write_lock_bh(&bond->lock); 2053 } 2054 2055 if (oldcurrent == slave) { 2056 /* 2057 * Note that we hold RTNL over this sequence, so there 2058 * is no concern that another slave add/remove event 2059 * will interfere. 2060 */ 2061 write_unlock_bh(&bond->lock); 2062 read_lock(&bond->lock); 2063 write_lock_bh(&bond->curr_slave_lock); 2064 2065 bond_select_active_slave(bond); 2066 2067 write_unlock_bh(&bond->curr_slave_lock); 2068 read_unlock(&bond->lock); 2069 write_lock_bh(&bond->lock); 2070 } 2071 2072 if (bond->slave_cnt == 0) { 2073 bond_set_carrier(bond); 2074 2075 /* if the last slave was removed, zero the mac address 2076 * of the master so it will be set by the application 2077 * to the mac address of the first slave 2078 */ 2079 memset(bond_dev->dev_addr, 0, bond_dev->addr_len); 2080 2081 if (bond->vlgrp) { 2082 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n", 2083 bond_dev->name, bond_dev->name); 2084 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n", 2085 bond_dev->name); 2086 } 2087 } 2088 2089 write_unlock_bh(&bond->lock); 2090 unblock_netpoll_tx(); 2091 2092 bond_compute_features(bond); 2093 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 2094 (old_features & NETIF_F_VLAN_CHALLENGED)) 2095 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n", 2096 bond_dev->name, slave_dev->name, bond_dev->name); 2097 2098 /* must do this from outside any spinlocks */ 2099 bond_destroy_slave_symlinks(bond_dev, slave_dev); 2100 2101 bond_del_vlans_from_slave(bond, slave_dev); 2102 2103 /* If the mode USES_PRIMARY, then we should only remove its 2104 * promisc and mc settings if it was the curr_active_slave, but that was 2105 * already taken care of above when we detached the slave 2106 */ 2107 if (!USES_PRIMARY(bond->params.mode)) { 2108 /* unset promiscuity level from slave */ 2109 if (bond_dev->flags & IFF_PROMISC) 2110 dev_set_promiscuity(slave_dev, -1); 2111 2112 /* unset allmulti level from slave */ 2113 if (bond_dev->flags & IFF_ALLMULTI) 2114 dev_set_allmulti(slave_dev, -1); 2115 2116 /* flush master's mc_list from slave */ 2117 netif_addr_lock_bh(bond_dev); 2118 bond_mc_list_flush(bond_dev, slave_dev); 2119 netif_addr_unlock_bh(bond_dev); 2120 } 2121 2122 netdev_set_bond_master(slave_dev, NULL); 2123 2124 slave_disable_netpoll(slave); 2125 2126 /* close slave before restoring its mac address */ 2127 dev_close(slave_dev); 2128 2129 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 2130 /* restore original ("permanent") mac address */ 2131 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN); 2132 addr.sa_family = slave_dev->type; 2133 dev_set_mac_address(slave_dev, &addr); 2134 } 2135 2136 dev_set_mtu(slave_dev, slave->original_mtu); 2137 2138 slave_dev->priv_flags &= ~IFF_BONDING; 2139 2140 kfree(slave); 2141 2142 return 0; /* deletion OK */ 2143 } 2144 2145 /* 2146 * First release a slave and then destroy the bond if no more slaves are left. 2147 * Must be under rtnl_lock when this function is called. 2148 */ 2149 static int bond_release_and_destroy(struct net_device *bond_dev, 2150 struct net_device *slave_dev) 2151 { 2152 struct bonding *bond = netdev_priv(bond_dev); 2153 int ret; 2154 2155 ret = bond_release(bond_dev, slave_dev); 2156 if ((ret == 0) && (bond->slave_cnt == 0)) { 2157 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 2158 pr_info("%s: destroying bond %s.\n", 2159 bond_dev->name, bond_dev->name); 2160 unregister_netdevice(bond_dev); 2161 } 2162 return ret; 2163 } 2164 2165 /* 2166 * This function releases all slaves. 2167 */ 2168 static int bond_release_all(struct net_device *bond_dev) 2169 { 2170 struct bonding *bond = netdev_priv(bond_dev); 2171 struct slave *slave; 2172 struct net_device *slave_dev; 2173 struct sockaddr addr; 2174 2175 write_lock_bh(&bond->lock); 2176 2177 netif_carrier_off(bond_dev); 2178 2179 if (bond->slave_cnt == 0) 2180 goto out; 2181 2182 bond->current_arp_slave = NULL; 2183 bond->primary_slave = NULL; 2184 bond_change_active_slave(bond, NULL); 2185 2186 while ((slave = bond->first_slave) != NULL) { 2187 /* Inform AD package of unbinding of slave 2188 * before slave is detached from the list. 2189 */ 2190 if (bond->params.mode == BOND_MODE_8023AD) 2191 bond_3ad_unbind_slave(slave); 2192 2193 slave_dev = slave->dev; 2194 bond_detach_slave(bond, slave); 2195 2196 /* now that the slave is detached, unlock and perform 2197 * all the undo steps that should not be called from 2198 * within a lock. 2199 */ 2200 write_unlock_bh(&bond->lock); 2201 2202 /* unregister rx_handler early so bond_handle_frame wouldn't 2203 * be called for this slave anymore. 2204 */ 2205 netdev_rx_handler_unregister(slave_dev); 2206 synchronize_net(); 2207 2208 if (bond_is_lb(bond)) { 2209 /* must be called only after the slave 2210 * has been detached from the list 2211 */ 2212 bond_alb_deinit_slave(bond, slave); 2213 } 2214 2215 bond_destroy_slave_symlinks(bond_dev, slave_dev); 2216 bond_del_vlans_from_slave(bond, slave_dev); 2217 2218 /* If the mode USES_PRIMARY, then we should only remove its 2219 * promisc and mc settings if it was the curr_active_slave, but that was 2220 * already taken care of above when we detached the slave 2221 */ 2222 if (!USES_PRIMARY(bond->params.mode)) { 2223 /* unset promiscuity level from slave */ 2224 if (bond_dev->flags & IFF_PROMISC) 2225 dev_set_promiscuity(slave_dev, -1); 2226 2227 /* unset allmulti level from slave */ 2228 if (bond_dev->flags & IFF_ALLMULTI) 2229 dev_set_allmulti(slave_dev, -1); 2230 2231 /* flush master's mc_list from slave */ 2232 netif_addr_lock_bh(bond_dev); 2233 bond_mc_list_flush(bond_dev, slave_dev); 2234 netif_addr_unlock_bh(bond_dev); 2235 } 2236 2237 netdev_set_bond_master(slave_dev, NULL); 2238 2239 slave_disable_netpoll(slave); 2240 2241 /* close slave before restoring its mac address */ 2242 dev_close(slave_dev); 2243 2244 if (!bond->params.fail_over_mac) { 2245 /* restore original ("permanent") mac address*/ 2246 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN); 2247 addr.sa_family = slave_dev->type; 2248 dev_set_mac_address(slave_dev, &addr); 2249 } 2250 2251 kfree(slave); 2252 2253 /* re-acquire the lock before getting the next slave */ 2254 write_lock_bh(&bond->lock); 2255 } 2256 2257 /* zero the mac address of the master so it will be 2258 * set by the application to the mac address of the 2259 * first slave 2260 */ 2261 memset(bond_dev->dev_addr, 0, bond_dev->addr_len); 2262 2263 if (bond->vlgrp) { 2264 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n", 2265 bond_dev->name, bond_dev->name); 2266 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n", 2267 bond_dev->name); 2268 } 2269 2270 pr_info("%s: released all slaves\n", bond_dev->name); 2271 2272 out: 2273 write_unlock_bh(&bond->lock); 2274 2275 bond_compute_features(bond); 2276 2277 return 0; 2278 } 2279 2280 /* 2281 * This function changes the active slave to slave <slave_dev>. 2282 * It returns -EINVAL in the following cases. 2283 * - <slave_dev> is not found in the list. 2284 * - There is not active slave now. 2285 * - <slave_dev> is already active. 2286 * - The link state of <slave_dev> is not BOND_LINK_UP. 2287 * - <slave_dev> is not running. 2288 * In these cases, this function does nothing. 2289 * In the other cases, current_slave pointer is changed and 0 is returned. 2290 */ 2291 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev) 2292 { 2293 struct bonding *bond = netdev_priv(bond_dev); 2294 struct slave *old_active = NULL; 2295 struct slave *new_active = NULL; 2296 int res = 0; 2297 2298 if (!USES_PRIMARY(bond->params.mode)) 2299 return -EINVAL; 2300 2301 /* Verify that master_dev is indeed the master of slave_dev */ 2302 if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev)) 2303 return -EINVAL; 2304 2305 read_lock(&bond->lock); 2306 2307 read_lock(&bond->curr_slave_lock); 2308 old_active = bond->curr_active_slave; 2309 read_unlock(&bond->curr_slave_lock); 2310 2311 new_active = bond_get_slave_by_dev(bond, slave_dev); 2312 2313 /* 2314 * Changing to the current active: do nothing; return success. 2315 */ 2316 if (new_active && (new_active == old_active)) { 2317 read_unlock(&bond->lock); 2318 return 0; 2319 } 2320 2321 if ((new_active) && 2322 (old_active) && 2323 (new_active->link == BOND_LINK_UP) && 2324 IS_UP(new_active->dev)) { 2325 block_netpoll_tx(); 2326 write_lock_bh(&bond->curr_slave_lock); 2327 bond_change_active_slave(bond, new_active); 2328 write_unlock_bh(&bond->curr_slave_lock); 2329 unblock_netpoll_tx(); 2330 } else 2331 res = -EINVAL; 2332 2333 read_unlock(&bond->lock); 2334 2335 return res; 2336 } 2337 2338 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info) 2339 { 2340 struct bonding *bond = netdev_priv(bond_dev); 2341 2342 info->bond_mode = bond->params.mode; 2343 info->miimon = bond->params.miimon; 2344 2345 read_lock(&bond->lock); 2346 info->num_slaves = bond->slave_cnt; 2347 read_unlock(&bond->lock); 2348 2349 return 0; 2350 } 2351 2352 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 2353 { 2354 struct bonding *bond = netdev_priv(bond_dev); 2355 struct slave *slave; 2356 int i, res = -ENODEV; 2357 2358 read_lock(&bond->lock); 2359 2360 bond_for_each_slave(bond, slave, i) { 2361 if (i == (int)info->slave_id) { 2362 res = 0; 2363 strcpy(info->slave_name, slave->dev->name); 2364 info->link = slave->link; 2365 info->state = bond_slave_state(slave); 2366 info->link_failure_count = slave->link_failure_count; 2367 break; 2368 } 2369 } 2370 2371 read_unlock(&bond->lock); 2372 2373 return res; 2374 } 2375 2376 /*-------------------------------- Monitoring -------------------------------*/ 2377 2378 2379 static int bond_miimon_inspect(struct bonding *bond) 2380 { 2381 struct slave *slave; 2382 int i, link_state, commit = 0; 2383 bool ignore_updelay; 2384 2385 ignore_updelay = !bond->curr_active_slave ? true : false; 2386 2387 bond_for_each_slave(bond, slave, i) { 2388 slave->new_link = BOND_LINK_NOCHANGE; 2389 2390 link_state = bond_check_dev_link(bond, slave->dev, 0); 2391 2392 switch (slave->link) { 2393 case BOND_LINK_UP: 2394 if (link_state) 2395 continue; 2396 2397 slave->link = BOND_LINK_FAIL; 2398 slave->delay = bond->params.downdelay; 2399 if (slave->delay) { 2400 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n", 2401 bond->dev->name, 2402 (bond->params.mode == 2403 BOND_MODE_ACTIVEBACKUP) ? 2404 (bond_is_active_slave(slave) ? 2405 "active " : "backup ") : "", 2406 slave->dev->name, 2407 bond->params.downdelay * bond->params.miimon); 2408 } 2409 /*FALLTHRU*/ 2410 case BOND_LINK_FAIL: 2411 if (link_state) { 2412 /* 2413 * recovered before downdelay expired 2414 */ 2415 slave->link = BOND_LINK_UP; 2416 slave->jiffies = jiffies; 2417 pr_info("%s: link status up again after %d ms for interface %s.\n", 2418 bond->dev->name, 2419 (bond->params.downdelay - slave->delay) * 2420 bond->params.miimon, 2421 slave->dev->name); 2422 continue; 2423 } 2424 2425 if (slave->delay <= 0) { 2426 slave->new_link = BOND_LINK_DOWN; 2427 commit++; 2428 continue; 2429 } 2430 2431 slave->delay--; 2432 break; 2433 2434 case BOND_LINK_DOWN: 2435 if (!link_state) 2436 continue; 2437 2438 slave->link = BOND_LINK_BACK; 2439 slave->delay = bond->params.updelay; 2440 2441 if (slave->delay) { 2442 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n", 2443 bond->dev->name, slave->dev->name, 2444 ignore_updelay ? 0 : 2445 bond->params.updelay * 2446 bond->params.miimon); 2447 } 2448 /*FALLTHRU*/ 2449 case BOND_LINK_BACK: 2450 if (!link_state) { 2451 slave->link = BOND_LINK_DOWN; 2452 pr_info("%s: link status down again after %d ms for interface %s.\n", 2453 bond->dev->name, 2454 (bond->params.updelay - slave->delay) * 2455 bond->params.miimon, 2456 slave->dev->name); 2457 2458 continue; 2459 } 2460 2461 if (ignore_updelay) 2462 slave->delay = 0; 2463 2464 if (slave->delay <= 0) { 2465 slave->new_link = BOND_LINK_UP; 2466 commit++; 2467 ignore_updelay = false; 2468 continue; 2469 } 2470 2471 slave->delay--; 2472 break; 2473 } 2474 } 2475 2476 return commit; 2477 } 2478 2479 static void bond_miimon_commit(struct bonding *bond) 2480 { 2481 struct slave *slave; 2482 int i; 2483 2484 bond_for_each_slave(bond, slave, i) { 2485 switch (slave->new_link) { 2486 case BOND_LINK_NOCHANGE: 2487 continue; 2488 2489 case BOND_LINK_UP: 2490 slave->link = BOND_LINK_UP; 2491 slave->jiffies = jiffies; 2492 2493 if (bond->params.mode == BOND_MODE_8023AD) { 2494 /* prevent it from being the active one */ 2495 bond_set_backup_slave(slave); 2496 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) { 2497 /* make it immediately active */ 2498 bond_set_active_slave(slave); 2499 } else if (slave != bond->primary_slave) { 2500 /* prevent it from being the active one */ 2501 bond_set_backup_slave(slave); 2502 } 2503 2504 bond_update_speed_duplex(slave); 2505 2506 pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n", 2507 bond->dev->name, slave->dev->name, 2508 slave->speed, slave->duplex ? "full" : "half"); 2509 2510 /* notify ad that the link status has changed */ 2511 if (bond->params.mode == BOND_MODE_8023AD) 2512 bond_3ad_handle_link_change(slave, BOND_LINK_UP); 2513 2514 if (bond_is_lb(bond)) 2515 bond_alb_handle_link_change(bond, slave, 2516 BOND_LINK_UP); 2517 2518 if (!bond->curr_active_slave || 2519 (slave == bond->primary_slave)) 2520 goto do_failover; 2521 2522 continue; 2523 2524 case BOND_LINK_DOWN: 2525 if (slave->link_failure_count < UINT_MAX) 2526 slave->link_failure_count++; 2527 2528 slave->link = BOND_LINK_DOWN; 2529 2530 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP || 2531 bond->params.mode == BOND_MODE_8023AD) 2532 bond_set_slave_inactive_flags(slave); 2533 2534 pr_info("%s: link status definitely down for interface %s, disabling it\n", 2535 bond->dev->name, slave->dev->name); 2536 2537 if (bond->params.mode == BOND_MODE_8023AD) 2538 bond_3ad_handle_link_change(slave, 2539 BOND_LINK_DOWN); 2540 2541 if (bond_is_lb(bond)) 2542 bond_alb_handle_link_change(bond, slave, 2543 BOND_LINK_DOWN); 2544 2545 if (slave == bond->curr_active_slave) 2546 goto do_failover; 2547 2548 continue; 2549 2550 default: 2551 pr_err("%s: invalid new link %d on slave %s\n", 2552 bond->dev->name, slave->new_link, 2553 slave->dev->name); 2554 slave->new_link = BOND_LINK_NOCHANGE; 2555 2556 continue; 2557 } 2558 2559 do_failover: 2560 ASSERT_RTNL(); 2561 block_netpoll_tx(); 2562 write_lock_bh(&bond->curr_slave_lock); 2563 bond_select_active_slave(bond); 2564 write_unlock_bh(&bond->curr_slave_lock); 2565 unblock_netpoll_tx(); 2566 } 2567 2568 bond_set_carrier(bond); 2569 } 2570 2571 /* 2572 * bond_mii_monitor 2573 * 2574 * Really a wrapper that splits the mii monitor into two phases: an 2575 * inspection, then (if inspection indicates something needs to be done) 2576 * an acquisition of appropriate locks followed by a commit phase to 2577 * implement whatever link state changes are indicated. 2578 */ 2579 void bond_mii_monitor(struct work_struct *work) 2580 { 2581 struct bonding *bond = container_of(work, struct bonding, 2582 mii_work.work); 2583 bool should_notify_peers = false; 2584 2585 read_lock(&bond->lock); 2586 if (bond->kill_timers) 2587 goto out; 2588 2589 if (bond->slave_cnt == 0) 2590 goto re_arm; 2591 2592 should_notify_peers = bond_should_notify_peers(bond); 2593 2594 if (bond_miimon_inspect(bond)) { 2595 read_unlock(&bond->lock); 2596 rtnl_lock(); 2597 read_lock(&bond->lock); 2598 2599 bond_miimon_commit(bond); 2600 2601 read_unlock(&bond->lock); 2602 rtnl_unlock(); /* might sleep, hold no other locks */ 2603 read_lock(&bond->lock); 2604 } 2605 2606 re_arm: 2607 if (bond->params.miimon) 2608 queue_delayed_work(bond->wq, &bond->mii_work, 2609 msecs_to_jiffies(bond->params.miimon)); 2610 out: 2611 read_unlock(&bond->lock); 2612 2613 if (should_notify_peers) { 2614 rtnl_lock(); 2615 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS); 2616 rtnl_unlock(); 2617 } 2618 } 2619 2620 static __be32 bond_glean_dev_ip(struct net_device *dev) 2621 { 2622 struct in_device *idev; 2623 struct in_ifaddr *ifa; 2624 __be32 addr = 0; 2625 2626 if (!dev) 2627 return 0; 2628 2629 rcu_read_lock(); 2630 idev = __in_dev_get_rcu(dev); 2631 if (!idev) 2632 goto out; 2633 2634 ifa = idev->ifa_list; 2635 if (!ifa) 2636 goto out; 2637 2638 addr = ifa->ifa_local; 2639 out: 2640 rcu_read_unlock(); 2641 return addr; 2642 } 2643 2644 static int bond_has_this_ip(struct bonding *bond, __be32 ip) 2645 { 2646 struct vlan_entry *vlan; 2647 2648 if (ip == bond->master_ip) 2649 return 1; 2650 2651 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 2652 if (ip == vlan->vlan_ip) 2653 return 1; 2654 } 2655 2656 return 0; 2657 } 2658 2659 /* 2660 * We go to the (large) trouble of VLAN tagging ARP frames because 2661 * switches in VLAN mode (especially if ports are configured as 2662 * "native" to a VLAN) might not pass non-tagged frames. 2663 */ 2664 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id) 2665 { 2666 struct sk_buff *skb; 2667 2668 pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op, 2669 slave_dev->name, dest_ip, src_ip, vlan_id); 2670 2671 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2672 NULL, slave_dev->dev_addr, NULL); 2673 2674 if (!skb) { 2675 pr_err("ARP packet allocation failed\n"); 2676 return; 2677 } 2678 if (vlan_id) { 2679 skb = vlan_put_tag(skb, vlan_id); 2680 if (!skb) { 2681 pr_err("failed to insert VLAN tag\n"); 2682 return; 2683 } 2684 } 2685 arp_xmit(skb); 2686 } 2687 2688 2689 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2690 { 2691 int i, vlan_id; 2692 __be32 *targets = bond->params.arp_targets; 2693 struct vlan_entry *vlan; 2694 struct net_device *vlan_dev; 2695 struct rtable *rt; 2696 2697 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) { 2698 if (!targets[i]) 2699 break; 2700 pr_debug("basa: target %x\n", targets[i]); 2701 if (!bond->vlgrp) { 2702 pr_debug("basa: empty vlan: arp_send\n"); 2703 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2704 bond->master_ip, 0); 2705 continue; 2706 } 2707 2708 /* 2709 * If VLANs are configured, we do a route lookup to 2710 * determine which VLAN interface would be used, so we 2711 * can tag the ARP with the proper VLAN tag. 2712 */ 2713 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 2714 RTO_ONLINK, 0); 2715 if (IS_ERR(rt)) { 2716 if (net_ratelimit()) { 2717 pr_warning("%s: no route to arp_ip_target %pI4\n", 2718 bond->dev->name, &targets[i]); 2719 } 2720 continue; 2721 } 2722 2723 /* 2724 * This target is not on a VLAN 2725 */ 2726 if (rt->dst.dev == bond->dev) { 2727 ip_rt_put(rt); 2728 pr_debug("basa: rtdev == bond->dev: arp_send\n"); 2729 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2730 bond->master_ip, 0); 2731 continue; 2732 } 2733 2734 vlan_id = 0; 2735 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 2736 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id); 2737 if (vlan_dev == rt->dst.dev) { 2738 vlan_id = vlan->vlan_id; 2739 pr_debug("basa: vlan match on %s %d\n", 2740 vlan_dev->name, vlan_id); 2741 break; 2742 } 2743 } 2744 2745 if (vlan_id) { 2746 ip_rt_put(rt); 2747 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2748 vlan->vlan_ip, vlan_id); 2749 continue; 2750 } 2751 2752 if (net_ratelimit()) { 2753 pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n", 2754 bond->dev->name, &targets[i], 2755 rt->dst.dev ? rt->dst.dev->name : "NULL"); 2756 } 2757 ip_rt_put(rt); 2758 } 2759 } 2760 2761 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 2762 { 2763 int i; 2764 __be32 *targets = bond->params.arp_targets; 2765 2766 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) { 2767 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n", 2768 &sip, &tip, i, &targets[i], 2769 bond_has_this_ip(bond, tip)); 2770 if (sip == targets[i]) { 2771 if (bond_has_this_ip(bond, tip)) 2772 slave->last_arp_rx = jiffies; 2773 return; 2774 } 2775 } 2776 } 2777 2778 static void bond_arp_rcv(struct sk_buff *skb, struct bonding *bond, 2779 struct slave *slave) 2780 { 2781 struct arphdr *arp; 2782 unsigned char *arp_ptr; 2783 __be32 sip, tip; 2784 2785 if (skb->protocol != __cpu_to_be16(ETH_P_ARP)) 2786 return; 2787 2788 read_lock(&bond->lock); 2789 2790 pr_debug("bond_arp_rcv: bond %s skb->dev %s\n", 2791 bond->dev->name, skb->dev->name); 2792 2793 if (!pskb_may_pull(skb, arp_hdr_len(bond->dev))) 2794 goto out_unlock; 2795 2796 arp = arp_hdr(skb); 2797 if (arp->ar_hln != bond->dev->addr_len || 2798 skb->pkt_type == PACKET_OTHERHOST || 2799 skb->pkt_type == PACKET_LOOPBACK || 2800 arp->ar_hrd != htons(ARPHRD_ETHER) || 2801 arp->ar_pro != htons(ETH_P_IP) || 2802 arp->ar_pln != 4) 2803 goto out_unlock; 2804 2805 arp_ptr = (unsigned char *)(arp + 1); 2806 arp_ptr += bond->dev->addr_len; 2807 memcpy(&sip, arp_ptr, 4); 2808 arp_ptr += 4 + bond->dev->addr_len; 2809 memcpy(&tip, arp_ptr, 4); 2810 2811 pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n", 2812 bond->dev->name, slave->dev->name, bond_slave_state(slave), 2813 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 2814 &sip, &tip); 2815 2816 /* 2817 * Backup slaves won't see the ARP reply, but do come through 2818 * here for each ARP probe (so we swap the sip/tip to validate 2819 * the probe). In a "redundant switch, common router" type of 2820 * configuration, the ARP probe will (hopefully) travel from 2821 * the active, through one switch, the router, then the other 2822 * switch before reaching the backup. 2823 */ 2824 if (bond_is_active_slave(slave)) 2825 bond_validate_arp(bond, slave, sip, tip); 2826 else 2827 bond_validate_arp(bond, slave, tip, sip); 2828 2829 out_unlock: 2830 read_unlock(&bond->lock); 2831 } 2832 2833 /* 2834 * this function is called regularly to monitor each slave's link 2835 * ensuring that traffic is being sent and received when arp monitoring 2836 * is used in load-balancing mode. if the adapter has been dormant, then an 2837 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 2838 * arp monitoring in active backup mode. 2839 */ 2840 void bond_loadbalance_arp_mon(struct work_struct *work) 2841 { 2842 struct bonding *bond = container_of(work, struct bonding, 2843 arp_work.work); 2844 struct slave *slave, *oldcurrent; 2845 int do_failover = 0; 2846 int delta_in_ticks; 2847 int i; 2848 2849 read_lock(&bond->lock); 2850 2851 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2852 2853 if (bond->kill_timers) 2854 goto out; 2855 2856 if (bond->slave_cnt == 0) 2857 goto re_arm; 2858 2859 read_lock(&bond->curr_slave_lock); 2860 oldcurrent = bond->curr_active_slave; 2861 read_unlock(&bond->curr_slave_lock); 2862 2863 /* see if any of the previous devices are up now (i.e. they have 2864 * xmt and rcv traffic). the curr_active_slave does not come into 2865 * the picture unless it is null. also, slave->jiffies is not needed 2866 * here because we send an arp on each slave and give a slave as 2867 * long as it needs to get the tx/rx within the delta. 2868 * TODO: what about up/down delay in arp mode? it wasn't here before 2869 * so it can wait 2870 */ 2871 bond_for_each_slave(bond, slave, i) { 2872 unsigned long trans_start = dev_trans_start(slave->dev); 2873 2874 if (slave->link != BOND_LINK_UP) { 2875 if (time_in_range(jiffies, 2876 trans_start - delta_in_ticks, 2877 trans_start + delta_in_ticks) && 2878 time_in_range(jiffies, 2879 slave->dev->last_rx - delta_in_ticks, 2880 slave->dev->last_rx + delta_in_ticks)) { 2881 2882 slave->link = BOND_LINK_UP; 2883 bond_set_active_slave(slave); 2884 2885 /* primary_slave has no meaning in round-robin 2886 * mode. the window of a slave being up and 2887 * curr_active_slave being null after enslaving 2888 * is closed. 2889 */ 2890 if (!oldcurrent) { 2891 pr_info("%s: link status definitely up for interface %s, ", 2892 bond->dev->name, 2893 slave->dev->name); 2894 do_failover = 1; 2895 } else { 2896 pr_info("%s: interface %s is now up\n", 2897 bond->dev->name, 2898 slave->dev->name); 2899 } 2900 } 2901 } else { 2902 /* slave->link == BOND_LINK_UP */ 2903 2904 /* not all switches will respond to an arp request 2905 * when the source ip is 0, so don't take the link down 2906 * if we don't know our ip yet 2907 */ 2908 if (!time_in_range(jiffies, 2909 trans_start - delta_in_ticks, 2910 trans_start + 2 * delta_in_ticks) || 2911 !time_in_range(jiffies, 2912 slave->dev->last_rx - delta_in_ticks, 2913 slave->dev->last_rx + 2 * delta_in_ticks)) { 2914 2915 slave->link = BOND_LINK_DOWN; 2916 bond_set_backup_slave(slave); 2917 2918 if (slave->link_failure_count < UINT_MAX) 2919 slave->link_failure_count++; 2920 2921 pr_info("%s: interface %s is now down.\n", 2922 bond->dev->name, 2923 slave->dev->name); 2924 2925 if (slave == oldcurrent) 2926 do_failover = 1; 2927 } 2928 } 2929 2930 /* note: if switch is in round-robin mode, all links 2931 * must tx arp to ensure all links rx an arp - otherwise 2932 * links may oscillate or not come up at all; if switch is 2933 * in something like xor mode, there is nothing we can 2934 * do - all replies will be rx'ed on same link causing slaves 2935 * to be unstable during low/no traffic periods 2936 */ 2937 if (IS_UP(slave->dev)) 2938 bond_arp_send_all(bond, slave); 2939 } 2940 2941 if (do_failover) { 2942 block_netpoll_tx(); 2943 write_lock_bh(&bond->curr_slave_lock); 2944 2945 bond_select_active_slave(bond); 2946 2947 write_unlock_bh(&bond->curr_slave_lock); 2948 unblock_netpoll_tx(); 2949 } 2950 2951 re_arm: 2952 if (bond->params.arp_interval) 2953 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 2954 out: 2955 read_unlock(&bond->lock); 2956 } 2957 2958 /* 2959 * Called to inspect slaves for active-backup mode ARP monitor link state 2960 * changes. Sets new_link in slaves to specify what action should take 2961 * place for the slave. Returns 0 if no changes are found, >0 if changes 2962 * to link states must be committed. 2963 * 2964 * Called with bond->lock held for read. 2965 */ 2966 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks) 2967 { 2968 struct slave *slave; 2969 int i, commit = 0; 2970 unsigned long trans_start; 2971 2972 bond_for_each_slave(bond, slave, i) { 2973 slave->new_link = BOND_LINK_NOCHANGE; 2974 2975 if (slave->link != BOND_LINK_UP) { 2976 if (time_in_range(jiffies, 2977 slave_last_rx(bond, slave) - delta_in_ticks, 2978 slave_last_rx(bond, slave) + delta_in_ticks)) { 2979 2980 slave->new_link = BOND_LINK_UP; 2981 commit++; 2982 } 2983 2984 continue; 2985 } 2986 2987 /* 2988 * Give slaves 2*delta after being enslaved or made 2989 * active. This avoids bouncing, as the last receive 2990 * times need a full ARP monitor cycle to be updated. 2991 */ 2992 if (time_in_range(jiffies, 2993 slave->jiffies - delta_in_ticks, 2994 slave->jiffies + 2 * delta_in_ticks)) 2995 continue; 2996 2997 /* 2998 * Backup slave is down if: 2999 * - No current_arp_slave AND 3000 * - more than 3*delta since last receive AND 3001 * - the bond has an IP address 3002 * 3003 * Note: a non-null current_arp_slave indicates 3004 * the curr_active_slave went down and we are 3005 * searching for a new one; under this condition 3006 * we only take the curr_active_slave down - this 3007 * gives each slave a chance to tx/rx traffic 3008 * before being taken out 3009 */ 3010 if (!bond_is_active_slave(slave) && 3011 !bond->current_arp_slave && 3012 !time_in_range(jiffies, 3013 slave_last_rx(bond, slave) - delta_in_ticks, 3014 slave_last_rx(bond, slave) + 3 * delta_in_ticks)) { 3015 3016 slave->new_link = BOND_LINK_DOWN; 3017 commit++; 3018 } 3019 3020 /* 3021 * Active slave is down if: 3022 * - more than 2*delta since transmitting OR 3023 * - (more than 2*delta since receive AND 3024 * the bond has an IP address) 3025 */ 3026 trans_start = dev_trans_start(slave->dev); 3027 if (bond_is_active_slave(slave) && 3028 (!time_in_range(jiffies, 3029 trans_start - delta_in_ticks, 3030 trans_start + 2 * delta_in_ticks) || 3031 !time_in_range(jiffies, 3032 slave_last_rx(bond, slave) - delta_in_ticks, 3033 slave_last_rx(bond, slave) + 2 * delta_in_ticks))) { 3034 3035 slave->new_link = BOND_LINK_DOWN; 3036 commit++; 3037 } 3038 } 3039 3040 return commit; 3041 } 3042 3043 /* 3044 * Called to commit link state changes noted by inspection step of 3045 * active-backup mode ARP monitor. 3046 * 3047 * Called with RTNL and bond->lock for read. 3048 */ 3049 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks) 3050 { 3051 struct slave *slave; 3052 int i; 3053 unsigned long trans_start; 3054 3055 bond_for_each_slave(bond, slave, i) { 3056 switch (slave->new_link) { 3057 case BOND_LINK_NOCHANGE: 3058 continue; 3059 3060 case BOND_LINK_UP: 3061 trans_start = dev_trans_start(slave->dev); 3062 if ((!bond->curr_active_slave && 3063 time_in_range(jiffies, 3064 trans_start - delta_in_ticks, 3065 trans_start + delta_in_ticks)) || 3066 bond->curr_active_slave != slave) { 3067 slave->link = BOND_LINK_UP; 3068 bond->current_arp_slave = NULL; 3069 3070 pr_info("%s: link status definitely up for interface %s.\n", 3071 bond->dev->name, slave->dev->name); 3072 3073 if (!bond->curr_active_slave || 3074 (slave == bond->primary_slave)) 3075 goto do_failover; 3076 3077 } 3078 3079 continue; 3080 3081 case BOND_LINK_DOWN: 3082 if (slave->link_failure_count < UINT_MAX) 3083 slave->link_failure_count++; 3084 3085 slave->link = BOND_LINK_DOWN; 3086 bond_set_slave_inactive_flags(slave); 3087 3088 pr_info("%s: link status definitely down for interface %s, disabling it\n", 3089 bond->dev->name, slave->dev->name); 3090 3091 if (slave == bond->curr_active_slave) { 3092 bond->current_arp_slave = NULL; 3093 goto do_failover; 3094 } 3095 3096 continue; 3097 3098 default: 3099 pr_err("%s: impossible: new_link %d on slave %s\n", 3100 bond->dev->name, slave->new_link, 3101 slave->dev->name); 3102 continue; 3103 } 3104 3105 do_failover: 3106 ASSERT_RTNL(); 3107 block_netpoll_tx(); 3108 write_lock_bh(&bond->curr_slave_lock); 3109 bond_select_active_slave(bond); 3110 write_unlock_bh(&bond->curr_slave_lock); 3111 unblock_netpoll_tx(); 3112 } 3113 3114 bond_set_carrier(bond); 3115 } 3116 3117 /* 3118 * Send ARP probes for active-backup mode ARP monitor. 3119 * 3120 * Called with bond->lock held for read. 3121 */ 3122 static void bond_ab_arp_probe(struct bonding *bond) 3123 { 3124 struct slave *slave; 3125 int i; 3126 3127 read_lock(&bond->curr_slave_lock); 3128 3129 if (bond->current_arp_slave && bond->curr_active_slave) 3130 pr_info("PROBE: c_arp %s && cas %s BAD\n", 3131 bond->current_arp_slave->dev->name, 3132 bond->curr_active_slave->dev->name); 3133 3134 if (bond->curr_active_slave) { 3135 bond_arp_send_all(bond, bond->curr_active_slave); 3136 read_unlock(&bond->curr_slave_lock); 3137 return; 3138 } 3139 3140 read_unlock(&bond->curr_slave_lock); 3141 3142 /* if we don't have a curr_active_slave, search for the next available 3143 * backup slave from the current_arp_slave and make it the candidate 3144 * for becoming the curr_active_slave 3145 */ 3146 3147 if (!bond->current_arp_slave) { 3148 bond->current_arp_slave = bond->first_slave; 3149 if (!bond->current_arp_slave) 3150 return; 3151 } 3152 3153 bond_set_slave_inactive_flags(bond->current_arp_slave); 3154 3155 /* search for next candidate */ 3156 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) { 3157 if (IS_UP(slave->dev)) { 3158 slave->link = BOND_LINK_BACK; 3159 bond_set_slave_active_flags(slave); 3160 bond_arp_send_all(bond, slave); 3161 slave->jiffies = jiffies; 3162 bond->current_arp_slave = slave; 3163 break; 3164 } 3165 3166 /* if the link state is up at this point, we 3167 * mark it down - this can happen if we have 3168 * simultaneous link failures and 3169 * reselect_active_interface doesn't make this 3170 * one the current slave so it is still marked 3171 * up when it is actually down 3172 */ 3173 if (slave->link == BOND_LINK_UP) { 3174 slave->link = BOND_LINK_DOWN; 3175 if (slave->link_failure_count < UINT_MAX) 3176 slave->link_failure_count++; 3177 3178 bond_set_slave_inactive_flags(slave); 3179 3180 pr_info("%s: backup interface %s is now down.\n", 3181 bond->dev->name, slave->dev->name); 3182 } 3183 } 3184 } 3185 3186 void bond_activebackup_arp_mon(struct work_struct *work) 3187 { 3188 struct bonding *bond = container_of(work, struct bonding, 3189 arp_work.work); 3190 bool should_notify_peers = false; 3191 int delta_in_ticks; 3192 3193 read_lock(&bond->lock); 3194 3195 if (bond->kill_timers) 3196 goto out; 3197 3198 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3199 3200 if (bond->slave_cnt == 0) 3201 goto re_arm; 3202 3203 should_notify_peers = bond_should_notify_peers(bond); 3204 3205 if (bond_ab_arp_inspect(bond, delta_in_ticks)) { 3206 read_unlock(&bond->lock); 3207 rtnl_lock(); 3208 read_lock(&bond->lock); 3209 3210 bond_ab_arp_commit(bond, delta_in_ticks); 3211 3212 read_unlock(&bond->lock); 3213 rtnl_unlock(); 3214 read_lock(&bond->lock); 3215 } 3216 3217 bond_ab_arp_probe(bond); 3218 3219 re_arm: 3220 if (bond->params.arp_interval) 3221 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 3222 out: 3223 read_unlock(&bond->lock); 3224 3225 if (should_notify_peers) { 3226 rtnl_lock(); 3227 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS); 3228 rtnl_unlock(); 3229 } 3230 } 3231 3232 /*-------------------------- netdev event handling --------------------------*/ 3233 3234 /* 3235 * Change device name 3236 */ 3237 static int bond_event_changename(struct bonding *bond) 3238 { 3239 bond_remove_proc_entry(bond); 3240 bond_create_proc_entry(bond); 3241 3242 bond_debug_reregister(bond); 3243 3244 return NOTIFY_DONE; 3245 } 3246 3247 static int bond_master_netdev_event(unsigned long event, 3248 struct net_device *bond_dev) 3249 { 3250 struct bonding *event_bond = netdev_priv(bond_dev); 3251 3252 switch (event) { 3253 case NETDEV_CHANGENAME: 3254 return bond_event_changename(event_bond); 3255 default: 3256 break; 3257 } 3258 3259 return NOTIFY_DONE; 3260 } 3261 3262 static int bond_slave_netdev_event(unsigned long event, 3263 struct net_device *slave_dev) 3264 { 3265 struct net_device *bond_dev = slave_dev->master; 3266 struct bonding *bond = netdev_priv(bond_dev); 3267 3268 switch (event) { 3269 case NETDEV_UNREGISTER: 3270 if (bond_dev) { 3271 if (bond->setup_by_slave) 3272 bond_release_and_destroy(bond_dev, slave_dev); 3273 else 3274 bond_release(bond_dev, slave_dev); 3275 } 3276 break; 3277 case NETDEV_CHANGE: 3278 if (bond->params.mode == BOND_MODE_8023AD || bond_is_lb(bond)) { 3279 struct slave *slave; 3280 3281 slave = bond_get_slave_by_dev(bond, slave_dev); 3282 if (slave) { 3283 u32 old_speed = slave->speed; 3284 u8 old_duplex = slave->duplex; 3285 3286 bond_update_speed_duplex(slave); 3287 3288 if (bond_is_lb(bond)) 3289 break; 3290 3291 if (old_speed != slave->speed) 3292 bond_3ad_adapter_speed_changed(slave); 3293 if (old_duplex != slave->duplex) 3294 bond_3ad_adapter_duplex_changed(slave); 3295 } 3296 } 3297 3298 break; 3299 case NETDEV_DOWN: 3300 /* 3301 * ... Or is it this? 3302 */ 3303 break; 3304 case NETDEV_CHANGEMTU: 3305 /* 3306 * TODO: Should slaves be allowed to 3307 * independently alter their MTU? For 3308 * an active-backup bond, slaves need 3309 * not be the same type of device, so 3310 * MTUs may vary. For other modes, 3311 * slaves arguably should have the 3312 * same MTUs. To do this, we'd need to 3313 * take over the slave's change_mtu 3314 * function for the duration of their 3315 * servitude. 3316 */ 3317 break; 3318 case NETDEV_CHANGENAME: 3319 /* 3320 * TODO: handle changing the primary's name 3321 */ 3322 break; 3323 case NETDEV_FEAT_CHANGE: 3324 bond_compute_features(bond); 3325 break; 3326 default: 3327 break; 3328 } 3329 3330 return NOTIFY_DONE; 3331 } 3332 3333 /* 3334 * bond_netdev_event: handle netdev notifier chain events. 3335 * 3336 * This function receives events for the netdev chain. The caller (an 3337 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 3338 * locks for us to safely manipulate the slave devices (RTNL lock, 3339 * dev_probe_lock). 3340 */ 3341 static int bond_netdev_event(struct notifier_block *this, 3342 unsigned long event, void *ptr) 3343 { 3344 struct net_device *event_dev = (struct net_device *)ptr; 3345 3346 pr_debug("event_dev: %s, event: %lx\n", 3347 event_dev ? event_dev->name : "None", 3348 event); 3349 3350 if (!(event_dev->priv_flags & IFF_BONDING)) 3351 return NOTIFY_DONE; 3352 3353 if (event_dev->flags & IFF_MASTER) { 3354 pr_debug("IFF_MASTER\n"); 3355 return bond_master_netdev_event(event, event_dev); 3356 } 3357 3358 if (event_dev->flags & IFF_SLAVE) { 3359 pr_debug("IFF_SLAVE\n"); 3360 return bond_slave_netdev_event(event, event_dev); 3361 } 3362 3363 return NOTIFY_DONE; 3364 } 3365 3366 /* 3367 * bond_inetaddr_event: handle inetaddr notifier chain events. 3368 * 3369 * We keep track of device IPs primarily to use as source addresses in 3370 * ARP monitor probes (rather than spewing out broadcasts all the time). 3371 * 3372 * We track one IP for the main device (if it has one), plus one per VLAN. 3373 */ 3374 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) 3375 { 3376 struct in_ifaddr *ifa = ptr; 3377 struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev; 3378 struct bond_net *bn = net_generic(dev_net(event_dev), bond_net_id); 3379 struct bonding *bond; 3380 struct vlan_entry *vlan; 3381 3382 list_for_each_entry(bond, &bn->dev_list, bond_list) { 3383 if (bond->dev == event_dev) { 3384 switch (event) { 3385 case NETDEV_UP: 3386 bond->master_ip = ifa->ifa_local; 3387 return NOTIFY_OK; 3388 case NETDEV_DOWN: 3389 bond->master_ip = bond_glean_dev_ip(bond->dev); 3390 return NOTIFY_OK; 3391 default: 3392 return NOTIFY_DONE; 3393 } 3394 } 3395 3396 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 3397 if (!bond->vlgrp) 3398 continue; 3399 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id); 3400 if (vlan_dev == event_dev) { 3401 switch (event) { 3402 case NETDEV_UP: 3403 vlan->vlan_ip = ifa->ifa_local; 3404 return NOTIFY_OK; 3405 case NETDEV_DOWN: 3406 vlan->vlan_ip = 3407 bond_glean_dev_ip(vlan_dev); 3408 return NOTIFY_OK; 3409 default: 3410 return NOTIFY_DONE; 3411 } 3412 } 3413 } 3414 } 3415 return NOTIFY_DONE; 3416 } 3417 3418 static struct notifier_block bond_netdev_notifier = { 3419 .notifier_call = bond_netdev_event, 3420 }; 3421 3422 static struct notifier_block bond_inetaddr_notifier = { 3423 .notifier_call = bond_inetaddr_event, 3424 }; 3425 3426 /*---------------------------- Hashing Policies -----------------------------*/ 3427 3428 /* 3429 * Hash for the output device based upon layer 2 and layer 3 data. If 3430 * the packet is not IP mimic bond_xmit_hash_policy_l2() 3431 */ 3432 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count) 3433 { 3434 struct ethhdr *data = (struct ethhdr *)skb->data; 3435 struct iphdr *iph = ip_hdr(skb); 3436 3437 if (skb->protocol == htons(ETH_P_IP)) { 3438 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^ 3439 (data->h_dest[5] ^ data->h_source[5])) % count; 3440 } 3441 3442 return (data->h_dest[5] ^ data->h_source[5]) % count; 3443 } 3444 3445 /* 3446 * Hash for the output device based upon layer 3 and layer 4 data. If 3447 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is 3448 * altogether not IP, mimic bond_xmit_hash_policy_l2() 3449 */ 3450 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count) 3451 { 3452 struct ethhdr *data = (struct ethhdr *)skb->data; 3453 struct iphdr *iph = ip_hdr(skb); 3454 __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl); 3455 int layer4_xor = 0; 3456 3457 if (skb->protocol == htons(ETH_P_IP)) { 3458 if (!(iph->frag_off & htons(IP_MF|IP_OFFSET)) && 3459 (iph->protocol == IPPROTO_TCP || 3460 iph->protocol == IPPROTO_UDP)) { 3461 layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1))); 3462 } 3463 return (layer4_xor ^ 3464 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count; 3465 3466 } 3467 3468 return (data->h_dest[5] ^ data->h_source[5]) % count; 3469 } 3470 3471 /* 3472 * Hash for the output device based upon layer 2 data 3473 */ 3474 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count) 3475 { 3476 struct ethhdr *data = (struct ethhdr *)skb->data; 3477 3478 return (data->h_dest[5] ^ data->h_source[5]) % count; 3479 } 3480 3481 /*-------------------------- Device entry points ----------------------------*/ 3482 3483 static int bond_open(struct net_device *bond_dev) 3484 { 3485 struct bonding *bond = netdev_priv(bond_dev); 3486 3487 bond->kill_timers = 0; 3488 3489 INIT_DELAYED_WORK(&bond->mcast_work, bond_resend_igmp_join_requests_delayed); 3490 3491 if (bond_is_lb(bond)) { 3492 /* bond_alb_initialize must be called before the timer 3493 * is started. 3494 */ 3495 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) { 3496 /* something went wrong - fail the open operation */ 3497 return -ENOMEM; 3498 } 3499 3500 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 3501 queue_delayed_work(bond->wq, &bond->alb_work, 0); 3502 } 3503 3504 if (bond->params.miimon) { /* link check interval, in milliseconds. */ 3505 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 3506 queue_delayed_work(bond->wq, &bond->mii_work, 0); 3507 } 3508 3509 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 3510 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) 3511 INIT_DELAYED_WORK(&bond->arp_work, 3512 bond_activebackup_arp_mon); 3513 else 3514 INIT_DELAYED_WORK(&bond->arp_work, 3515 bond_loadbalance_arp_mon); 3516 3517 queue_delayed_work(bond->wq, &bond->arp_work, 0); 3518 if (bond->params.arp_validate) 3519 bond->recv_probe = bond_arp_rcv; 3520 } 3521 3522 if (bond->params.mode == BOND_MODE_8023AD) { 3523 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 3524 queue_delayed_work(bond->wq, &bond->ad_work, 0); 3525 /* register to receive LACPDUs */ 3526 bond->recv_probe = bond_3ad_lacpdu_recv; 3527 bond_3ad_initiate_agg_selection(bond, 1); 3528 } 3529 3530 return 0; 3531 } 3532 3533 static int bond_close(struct net_device *bond_dev) 3534 { 3535 struct bonding *bond = netdev_priv(bond_dev); 3536 3537 write_lock_bh(&bond->lock); 3538 3539 bond->send_peer_notif = 0; 3540 3541 /* signal timers not to re-arm */ 3542 bond->kill_timers = 1; 3543 3544 write_unlock_bh(&bond->lock); 3545 3546 if (bond->params.miimon) { /* link check interval, in milliseconds. */ 3547 cancel_delayed_work(&bond->mii_work); 3548 } 3549 3550 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 3551 cancel_delayed_work(&bond->arp_work); 3552 } 3553 3554 switch (bond->params.mode) { 3555 case BOND_MODE_8023AD: 3556 cancel_delayed_work(&bond->ad_work); 3557 break; 3558 case BOND_MODE_TLB: 3559 case BOND_MODE_ALB: 3560 cancel_delayed_work(&bond->alb_work); 3561 break; 3562 default: 3563 break; 3564 } 3565 3566 if (delayed_work_pending(&bond->mcast_work)) 3567 cancel_delayed_work(&bond->mcast_work); 3568 3569 if (bond_is_lb(bond)) { 3570 /* Must be called only after all 3571 * slaves have been released 3572 */ 3573 bond_alb_deinitialize(bond); 3574 } 3575 bond->recv_probe = NULL; 3576 3577 return 0; 3578 } 3579 3580 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev, 3581 struct rtnl_link_stats64 *stats) 3582 { 3583 struct bonding *bond = netdev_priv(bond_dev); 3584 struct rtnl_link_stats64 temp; 3585 struct slave *slave; 3586 int i; 3587 3588 memset(stats, 0, sizeof(*stats)); 3589 3590 read_lock_bh(&bond->lock); 3591 3592 bond_for_each_slave(bond, slave, i) { 3593 const struct rtnl_link_stats64 *sstats = 3594 dev_get_stats(slave->dev, &temp); 3595 3596 stats->rx_packets += sstats->rx_packets; 3597 stats->rx_bytes += sstats->rx_bytes; 3598 stats->rx_errors += sstats->rx_errors; 3599 stats->rx_dropped += sstats->rx_dropped; 3600 3601 stats->tx_packets += sstats->tx_packets; 3602 stats->tx_bytes += sstats->tx_bytes; 3603 stats->tx_errors += sstats->tx_errors; 3604 stats->tx_dropped += sstats->tx_dropped; 3605 3606 stats->multicast += sstats->multicast; 3607 stats->collisions += sstats->collisions; 3608 3609 stats->rx_length_errors += sstats->rx_length_errors; 3610 stats->rx_over_errors += sstats->rx_over_errors; 3611 stats->rx_crc_errors += sstats->rx_crc_errors; 3612 stats->rx_frame_errors += sstats->rx_frame_errors; 3613 stats->rx_fifo_errors += sstats->rx_fifo_errors; 3614 stats->rx_missed_errors += sstats->rx_missed_errors; 3615 3616 stats->tx_aborted_errors += sstats->tx_aborted_errors; 3617 stats->tx_carrier_errors += sstats->tx_carrier_errors; 3618 stats->tx_fifo_errors += sstats->tx_fifo_errors; 3619 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors; 3620 stats->tx_window_errors += sstats->tx_window_errors; 3621 } 3622 3623 read_unlock_bh(&bond->lock); 3624 3625 return stats; 3626 } 3627 3628 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 3629 { 3630 struct net_device *slave_dev = NULL; 3631 struct ifbond k_binfo; 3632 struct ifbond __user *u_binfo = NULL; 3633 struct ifslave k_sinfo; 3634 struct ifslave __user *u_sinfo = NULL; 3635 struct mii_ioctl_data *mii = NULL; 3636 int res = 0; 3637 3638 pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd); 3639 3640 switch (cmd) { 3641 case SIOCGMIIPHY: 3642 mii = if_mii(ifr); 3643 if (!mii) 3644 return -EINVAL; 3645 3646 mii->phy_id = 0; 3647 /* Fall Through */ 3648 case SIOCGMIIREG: 3649 /* 3650 * We do this again just in case we were called by SIOCGMIIREG 3651 * instead of SIOCGMIIPHY. 3652 */ 3653 mii = if_mii(ifr); 3654 if (!mii) 3655 return -EINVAL; 3656 3657 3658 if (mii->reg_num == 1) { 3659 struct bonding *bond = netdev_priv(bond_dev); 3660 mii->val_out = 0; 3661 read_lock(&bond->lock); 3662 read_lock(&bond->curr_slave_lock); 3663 if (netif_carrier_ok(bond->dev)) 3664 mii->val_out = BMSR_LSTATUS; 3665 3666 read_unlock(&bond->curr_slave_lock); 3667 read_unlock(&bond->lock); 3668 } 3669 3670 return 0; 3671 case BOND_INFO_QUERY_OLD: 3672 case SIOCBONDINFOQUERY: 3673 u_binfo = (struct ifbond __user *)ifr->ifr_data; 3674 3675 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 3676 return -EFAULT; 3677 3678 res = bond_info_query(bond_dev, &k_binfo); 3679 if (res == 0 && 3680 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 3681 return -EFAULT; 3682 3683 return res; 3684 case BOND_SLAVE_INFO_QUERY_OLD: 3685 case SIOCBONDSLAVEINFOQUERY: 3686 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 3687 3688 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 3689 return -EFAULT; 3690 3691 res = bond_slave_info_query(bond_dev, &k_sinfo); 3692 if (res == 0 && 3693 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 3694 return -EFAULT; 3695 3696 return res; 3697 default: 3698 /* Go on */ 3699 break; 3700 } 3701 3702 if (!capable(CAP_NET_ADMIN)) 3703 return -EPERM; 3704 3705 slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave); 3706 3707 pr_debug("slave_dev=%p:\n", slave_dev); 3708 3709 if (!slave_dev) 3710 res = -ENODEV; 3711 else { 3712 pr_debug("slave_dev->name=%s:\n", slave_dev->name); 3713 switch (cmd) { 3714 case BOND_ENSLAVE_OLD: 3715 case SIOCBONDENSLAVE: 3716 res = bond_enslave(bond_dev, slave_dev); 3717 break; 3718 case BOND_RELEASE_OLD: 3719 case SIOCBONDRELEASE: 3720 res = bond_release(bond_dev, slave_dev); 3721 break; 3722 case BOND_SETHWADDR_OLD: 3723 case SIOCBONDSETHWADDR: 3724 res = bond_sethwaddr(bond_dev, slave_dev); 3725 break; 3726 case BOND_CHANGE_ACTIVE_OLD: 3727 case SIOCBONDCHANGEACTIVE: 3728 res = bond_ioctl_change_active(bond_dev, slave_dev); 3729 break; 3730 default: 3731 res = -EOPNOTSUPP; 3732 } 3733 3734 dev_put(slave_dev); 3735 } 3736 3737 return res; 3738 } 3739 3740 static bool bond_addr_in_mc_list(unsigned char *addr, 3741 struct netdev_hw_addr_list *list, 3742 int addrlen) 3743 { 3744 struct netdev_hw_addr *ha; 3745 3746 netdev_hw_addr_list_for_each(ha, list) 3747 if (!memcmp(ha->addr, addr, addrlen)) 3748 return true; 3749 3750 return false; 3751 } 3752 3753 static void bond_set_multicast_list(struct net_device *bond_dev) 3754 { 3755 struct bonding *bond = netdev_priv(bond_dev); 3756 struct netdev_hw_addr *ha; 3757 bool found; 3758 3759 /* 3760 * Do promisc before checking multicast_mode 3761 */ 3762 if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) 3763 /* 3764 * FIXME: Need to handle the error when one of the multi-slaves 3765 * encounters error. 3766 */ 3767 bond_set_promiscuity(bond, 1); 3768 3769 3770 if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) 3771 bond_set_promiscuity(bond, -1); 3772 3773 3774 /* set allmulti flag to slaves */ 3775 if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) 3776 /* 3777 * FIXME: Need to handle the error when one of the multi-slaves 3778 * encounters error. 3779 */ 3780 bond_set_allmulti(bond, 1); 3781 3782 3783 if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) 3784 bond_set_allmulti(bond, -1); 3785 3786 3787 read_lock(&bond->lock); 3788 3789 bond->flags = bond_dev->flags; 3790 3791 /* looking for addresses to add to slaves' mc list */ 3792 netdev_for_each_mc_addr(ha, bond_dev) { 3793 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list, 3794 bond_dev->addr_len); 3795 if (!found) 3796 bond_mc_add(bond, ha->addr); 3797 } 3798 3799 /* looking for addresses to delete from slaves' list */ 3800 netdev_hw_addr_list_for_each(ha, &bond->mc_list) { 3801 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc, 3802 bond_dev->addr_len); 3803 if (!found) 3804 bond_mc_del(bond, ha->addr); 3805 } 3806 3807 /* save master's multicast list */ 3808 __hw_addr_flush(&bond->mc_list); 3809 __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc, 3810 bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST); 3811 3812 read_unlock(&bond->lock); 3813 } 3814 3815 static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms) 3816 { 3817 struct bonding *bond = netdev_priv(dev); 3818 struct slave *slave = bond->first_slave; 3819 3820 if (slave) { 3821 const struct net_device_ops *slave_ops 3822 = slave->dev->netdev_ops; 3823 if (slave_ops->ndo_neigh_setup) 3824 return slave_ops->ndo_neigh_setup(slave->dev, parms); 3825 } 3826 return 0; 3827 } 3828 3829 /* 3830 * Change the MTU of all of a master's slaves to match the master 3831 */ 3832 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 3833 { 3834 struct bonding *bond = netdev_priv(bond_dev); 3835 struct slave *slave, *stop_at; 3836 int res = 0; 3837 int i; 3838 3839 pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond, 3840 (bond_dev ? bond_dev->name : "None"), new_mtu); 3841 3842 /* Can't hold bond->lock with bh disabled here since 3843 * some base drivers panic. On the other hand we can't 3844 * hold bond->lock without bh disabled because we'll 3845 * deadlock. The only solution is to rely on the fact 3846 * that we're under rtnl_lock here, and the slaves 3847 * list won't change. This doesn't solve the problem 3848 * of setting the slave's MTU while it is 3849 * transmitting, but the assumption is that the base 3850 * driver can handle that. 3851 * 3852 * TODO: figure out a way to safely iterate the slaves 3853 * list, but without holding a lock around the actual 3854 * call to the base driver. 3855 */ 3856 3857 bond_for_each_slave(bond, slave, i) { 3858 pr_debug("s %p s->p %p c_m %p\n", 3859 slave, 3860 slave->prev, 3861 slave->dev->netdev_ops->ndo_change_mtu); 3862 3863 res = dev_set_mtu(slave->dev, new_mtu); 3864 3865 if (res) { 3866 /* If we failed to set the slave's mtu to the new value 3867 * we must abort the operation even in ACTIVE_BACKUP 3868 * mode, because if we allow the backup slaves to have 3869 * different mtu values than the active slave we'll 3870 * need to change their mtu when doing a failover. That 3871 * means changing their mtu from timer context, which 3872 * is probably not a good idea. 3873 */ 3874 pr_debug("err %d %s\n", res, slave->dev->name); 3875 goto unwind; 3876 } 3877 } 3878 3879 bond_dev->mtu = new_mtu; 3880 3881 return 0; 3882 3883 unwind: 3884 /* unwind from head to the slave that failed */ 3885 stop_at = slave; 3886 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { 3887 int tmp_res; 3888 3889 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu); 3890 if (tmp_res) { 3891 pr_debug("unwind err %d dev %s\n", 3892 tmp_res, slave->dev->name); 3893 } 3894 } 3895 3896 return res; 3897 } 3898 3899 /* 3900 * Change HW address 3901 * 3902 * Note that many devices must be down to change the HW address, and 3903 * downing the master releases all slaves. We can make bonds full of 3904 * bonding devices to test this, however. 3905 */ 3906 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 3907 { 3908 struct bonding *bond = netdev_priv(bond_dev); 3909 struct sockaddr *sa = addr, tmp_sa; 3910 struct slave *slave, *stop_at; 3911 int res = 0; 3912 int i; 3913 3914 if (bond->params.mode == BOND_MODE_ALB) 3915 return bond_alb_set_mac_address(bond_dev, addr); 3916 3917 3918 pr_debug("bond=%p, name=%s\n", 3919 bond, bond_dev ? bond_dev->name : "None"); 3920 3921 /* 3922 * If fail_over_mac is set to active, do nothing and return 3923 * success. Returning an error causes ifenslave to fail. 3924 */ 3925 if (bond->params.fail_over_mac == BOND_FOM_ACTIVE) 3926 return 0; 3927 3928 if (!is_valid_ether_addr(sa->sa_data)) 3929 return -EADDRNOTAVAIL; 3930 3931 /* Can't hold bond->lock with bh disabled here since 3932 * some base drivers panic. On the other hand we can't 3933 * hold bond->lock without bh disabled because we'll 3934 * deadlock. The only solution is to rely on the fact 3935 * that we're under rtnl_lock here, and the slaves 3936 * list won't change. This doesn't solve the problem 3937 * of setting the slave's hw address while it is 3938 * transmitting, but the assumption is that the base 3939 * driver can handle that. 3940 * 3941 * TODO: figure out a way to safely iterate the slaves 3942 * list, but without holding a lock around the actual 3943 * call to the base driver. 3944 */ 3945 3946 bond_for_each_slave(bond, slave, i) { 3947 const struct net_device_ops *slave_ops = slave->dev->netdev_ops; 3948 pr_debug("slave %p %s\n", slave, slave->dev->name); 3949 3950 if (slave_ops->ndo_set_mac_address == NULL) { 3951 res = -EOPNOTSUPP; 3952 pr_debug("EOPNOTSUPP %s\n", slave->dev->name); 3953 goto unwind; 3954 } 3955 3956 res = dev_set_mac_address(slave->dev, addr); 3957 if (res) { 3958 /* TODO: consider downing the slave 3959 * and retry ? 3960 * User should expect communications 3961 * breakage anyway until ARP finish 3962 * updating, so... 3963 */ 3964 pr_debug("err %d %s\n", res, slave->dev->name); 3965 goto unwind; 3966 } 3967 } 3968 3969 /* success */ 3970 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); 3971 return 0; 3972 3973 unwind: 3974 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 3975 tmp_sa.sa_family = bond_dev->type; 3976 3977 /* unwind from head to the slave that failed */ 3978 stop_at = slave; 3979 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { 3980 int tmp_res; 3981 3982 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa); 3983 if (tmp_res) { 3984 pr_debug("unwind err %d dev %s\n", 3985 tmp_res, slave->dev->name); 3986 } 3987 } 3988 3989 return res; 3990 } 3991 3992 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev) 3993 { 3994 struct bonding *bond = netdev_priv(bond_dev); 3995 struct slave *slave, *start_at; 3996 int i, slave_no, res = 1; 3997 struct iphdr *iph = ip_hdr(skb); 3998 3999 /* 4000 * Start with the curr_active_slave that joined the bond as the 4001 * default for sending IGMP traffic. For failover purposes one 4002 * needs to maintain some consistency for the interface that will 4003 * send the join/membership reports. The curr_active_slave found 4004 * will send all of this type of traffic. 4005 */ 4006 if ((iph->protocol == IPPROTO_IGMP) && 4007 (skb->protocol == htons(ETH_P_IP))) { 4008 4009 read_lock(&bond->curr_slave_lock); 4010 slave = bond->curr_active_slave; 4011 read_unlock(&bond->curr_slave_lock); 4012 4013 if (!slave) 4014 goto out; 4015 } else { 4016 /* 4017 * Concurrent TX may collide on rr_tx_counter; we accept 4018 * that as being rare enough not to justify using an 4019 * atomic op here. 4020 */ 4021 slave_no = bond->rr_tx_counter++ % bond->slave_cnt; 4022 4023 bond_for_each_slave(bond, slave, i) { 4024 slave_no--; 4025 if (slave_no < 0) 4026 break; 4027 } 4028 } 4029 4030 start_at = slave; 4031 bond_for_each_slave_from(bond, slave, i, start_at) { 4032 if (IS_UP(slave->dev) && 4033 (slave->link == BOND_LINK_UP) && 4034 bond_is_active_slave(slave)) { 4035 res = bond_dev_queue_xmit(bond, skb, slave->dev); 4036 break; 4037 } 4038 } 4039 4040 out: 4041 if (res) { 4042 /* no suitable interface, frame not sent */ 4043 dev_kfree_skb(skb); 4044 } 4045 4046 return NETDEV_TX_OK; 4047 } 4048 4049 4050 /* 4051 * in active-backup mode, we know that bond->curr_active_slave is always valid if 4052 * the bond has a usable interface. 4053 */ 4054 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev) 4055 { 4056 struct bonding *bond = netdev_priv(bond_dev); 4057 int res = 1; 4058 4059 read_lock(&bond->curr_slave_lock); 4060 4061 if (bond->curr_active_slave) 4062 res = bond_dev_queue_xmit(bond, skb, 4063 bond->curr_active_slave->dev); 4064 4065 if (res) 4066 /* no suitable interface, frame not sent */ 4067 dev_kfree_skb(skb); 4068 4069 read_unlock(&bond->curr_slave_lock); 4070 4071 return NETDEV_TX_OK; 4072 } 4073 4074 /* 4075 * In bond_xmit_xor() , we determine the output device by using a pre- 4076 * determined xmit_hash_policy(), If the selected device is not enabled, 4077 * find the next active slave. 4078 */ 4079 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev) 4080 { 4081 struct bonding *bond = netdev_priv(bond_dev); 4082 struct slave *slave, *start_at; 4083 int slave_no; 4084 int i; 4085 int res = 1; 4086 4087 slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt); 4088 4089 bond_for_each_slave(bond, slave, i) { 4090 slave_no--; 4091 if (slave_no < 0) 4092 break; 4093 } 4094 4095 start_at = slave; 4096 4097 bond_for_each_slave_from(bond, slave, i, start_at) { 4098 if (IS_UP(slave->dev) && 4099 (slave->link == BOND_LINK_UP) && 4100 bond_is_active_slave(slave)) { 4101 res = bond_dev_queue_xmit(bond, skb, slave->dev); 4102 break; 4103 } 4104 } 4105 4106 if (res) { 4107 /* no suitable interface, frame not sent */ 4108 dev_kfree_skb(skb); 4109 } 4110 4111 return NETDEV_TX_OK; 4112 } 4113 4114 /* 4115 * in broadcast mode, we send everything to all usable interfaces. 4116 */ 4117 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev) 4118 { 4119 struct bonding *bond = netdev_priv(bond_dev); 4120 struct slave *slave, *start_at; 4121 struct net_device *tx_dev = NULL; 4122 int i; 4123 int res = 1; 4124 4125 read_lock(&bond->curr_slave_lock); 4126 start_at = bond->curr_active_slave; 4127 read_unlock(&bond->curr_slave_lock); 4128 4129 if (!start_at) 4130 goto out; 4131 4132 bond_for_each_slave_from(bond, slave, i, start_at) { 4133 if (IS_UP(slave->dev) && 4134 (slave->link == BOND_LINK_UP) && 4135 bond_is_active_slave(slave)) { 4136 if (tx_dev) { 4137 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 4138 if (!skb2) { 4139 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n", 4140 bond_dev->name); 4141 continue; 4142 } 4143 4144 res = bond_dev_queue_xmit(bond, skb2, tx_dev); 4145 if (res) { 4146 dev_kfree_skb(skb2); 4147 continue; 4148 } 4149 } 4150 tx_dev = slave->dev; 4151 } 4152 } 4153 4154 if (tx_dev) 4155 res = bond_dev_queue_xmit(bond, skb, tx_dev); 4156 4157 out: 4158 if (res) 4159 /* no suitable interface, frame not sent */ 4160 dev_kfree_skb(skb); 4161 4162 /* frame sent to all suitable interfaces */ 4163 return NETDEV_TX_OK; 4164 } 4165 4166 /*------------------------- Device initialization ---------------------------*/ 4167 4168 static void bond_set_xmit_hash_policy(struct bonding *bond) 4169 { 4170 switch (bond->params.xmit_policy) { 4171 case BOND_XMIT_POLICY_LAYER23: 4172 bond->xmit_hash_policy = bond_xmit_hash_policy_l23; 4173 break; 4174 case BOND_XMIT_POLICY_LAYER34: 4175 bond->xmit_hash_policy = bond_xmit_hash_policy_l34; 4176 break; 4177 case BOND_XMIT_POLICY_LAYER2: 4178 default: 4179 bond->xmit_hash_policy = bond_xmit_hash_policy_l2; 4180 break; 4181 } 4182 } 4183 4184 /* 4185 * Lookup the slave that corresponds to a qid 4186 */ 4187 static inline int bond_slave_override(struct bonding *bond, 4188 struct sk_buff *skb) 4189 { 4190 int i, res = 1; 4191 struct slave *slave = NULL; 4192 struct slave *check_slave; 4193 4194 if (!skb->queue_mapping) 4195 return 1; 4196 4197 /* Find out if any slaves have the same mapping as this skb. */ 4198 bond_for_each_slave(bond, check_slave, i) { 4199 if (check_slave->queue_id == skb->queue_mapping) { 4200 slave = check_slave; 4201 break; 4202 } 4203 } 4204 4205 /* If the slave isn't UP, use default transmit policy. */ 4206 if (slave && slave->queue_id && IS_UP(slave->dev) && 4207 (slave->link == BOND_LINK_UP)) { 4208 res = bond_dev_queue_xmit(bond, skb, slave->dev); 4209 } 4210 4211 return res; 4212 } 4213 4214 4215 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb) 4216 { 4217 /* 4218 * This helper function exists to help dev_pick_tx get the correct 4219 * destination queue. Using a helper function skips a call to 4220 * skb_tx_hash and will put the skbs in the queue we expect on their 4221 * way down to the bonding driver. 4222 */ 4223 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 4224 4225 /* 4226 * Save the original txq to restore before passing to the driver 4227 */ 4228 bond_queue_mapping(skb) = skb->queue_mapping; 4229 4230 if (unlikely(txq >= dev->real_num_tx_queues)) { 4231 do { 4232 txq -= dev->real_num_tx_queues; 4233 } while (txq >= dev->real_num_tx_queues); 4234 } 4235 return txq; 4236 } 4237 4238 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4239 { 4240 struct bonding *bond = netdev_priv(dev); 4241 4242 if (TX_QUEUE_OVERRIDE(bond->params.mode)) { 4243 if (!bond_slave_override(bond, skb)) 4244 return NETDEV_TX_OK; 4245 } 4246 4247 switch (bond->params.mode) { 4248 case BOND_MODE_ROUNDROBIN: 4249 return bond_xmit_roundrobin(skb, dev); 4250 case BOND_MODE_ACTIVEBACKUP: 4251 return bond_xmit_activebackup(skb, dev); 4252 case BOND_MODE_XOR: 4253 return bond_xmit_xor(skb, dev); 4254 case BOND_MODE_BROADCAST: 4255 return bond_xmit_broadcast(skb, dev); 4256 case BOND_MODE_8023AD: 4257 return bond_3ad_xmit_xor(skb, dev); 4258 case BOND_MODE_ALB: 4259 case BOND_MODE_TLB: 4260 return bond_alb_xmit(skb, dev); 4261 default: 4262 /* Should never happen, mode already checked */ 4263 pr_err("%s: Error: Unknown bonding mode %d\n", 4264 dev->name, bond->params.mode); 4265 WARN_ON_ONCE(1); 4266 dev_kfree_skb(skb); 4267 return NETDEV_TX_OK; 4268 } 4269 } 4270 4271 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4272 { 4273 struct bonding *bond = netdev_priv(dev); 4274 netdev_tx_t ret = NETDEV_TX_OK; 4275 4276 /* 4277 * If we risk deadlock from transmitting this in the 4278 * netpoll path, tell netpoll to queue the frame for later tx 4279 */ 4280 if (is_netpoll_tx_blocked(dev)) 4281 return NETDEV_TX_BUSY; 4282 4283 read_lock(&bond->lock); 4284 4285 if (bond->slave_cnt) 4286 ret = __bond_start_xmit(skb, dev); 4287 else 4288 dev_kfree_skb(skb); 4289 4290 read_unlock(&bond->lock); 4291 4292 return ret; 4293 } 4294 4295 /* 4296 * set bond mode specific net device operations 4297 */ 4298 void bond_set_mode_ops(struct bonding *bond, int mode) 4299 { 4300 struct net_device *bond_dev = bond->dev; 4301 4302 switch (mode) { 4303 case BOND_MODE_ROUNDROBIN: 4304 break; 4305 case BOND_MODE_ACTIVEBACKUP: 4306 break; 4307 case BOND_MODE_XOR: 4308 bond_set_xmit_hash_policy(bond); 4309 break; 4310 case BOND_MODE_BROADCAST: 4311 break; 4312 case BOND_MODE_8023AD: 4313 bond_set_xmit_hash_policy(bond); 4314 break; 4315 case BOND_MODE_ALB: 4316 /* FALLTHRU */ 4317 case BOND_MODE_TLB: 4318 break; 4319 default: 4320 /* Should never happen, mode already checked */ 4321 pr_err("%s: Error: Unknown bonding mode %d\n", 4322 bond_dev->name, mode); 4323 break; 4324 } 4325 } 4326 4327 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 4328 struct ethtool_drvinfo *drvinfo) 4329 { 4330 strncpy(drvinfo->driver, DRV_NAME, 32); 4331 strncpy(drvinfo->version, DRV_VERSION, 32); 4332 snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION); 4333 } 4334 4335 static const struct ethtool_ops bond_ethtool_ops = { 4336 .get_drvinfo = bond_ethtool_get_drvinfo, 4337 .get_link = ethtool_op_get_link, 4338 }; 4339 4340 static const struct net_device_ops bond_netdev_ops = { 4341 .ndo_init = bond_init, 4342 .ndo_uninit = bond_uninit, 4343 .ndo_open = bond_open, 4344 .ndo_stop = bond_close, 4345 .ndo_start_xmit = bond_start_xmit, 4346 .ndo_select_queue = bond_select_queue, 4347 .ndo_get_stats64 = bond_get_stats, 4348 .ndo_do_ioctl = bond_do_ioctl, 4349 .ndo_set_multicast_list = bond_set_multicast_list, 4350 .ndo_change_mtu = bond_change_mtu, 4351 .ndo_set_mac_address = bond_set_mac_address, 4352 .ndo_neigh_setup = bond_neigh_setup, 4353 .ndo_vlan_rx_register = bond_vlan_rx_register, 4354 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 4355 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 4356 #ifdef CONFIG_NET_POLL_CONTROLLER 4357 .ndo_netpoll_setup = bond_netpoll_setup, 4358 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 4359 .ndo_poll_controller = bond_poll_controller, 4360 #endif 4361 .ndo_add_slave = bond_enslave, 4362 .ndo_del_slave = bond_release, 4363 .ndo_fix_features = bond_fix_features, 4364 }; 4365 4366 static void bond_destructor(struct net_device *bond_dev) 4367 { 4368 struct bonding *bond = netdev_priv(bond_dev); 4369 if (bond->wq) 4370 destroy_workqueue(bond->wq); 4371 free_netdev(bond_dev); 4372 } 4373 4374 static void bond_setup(struct net_device *bond_dev) 4375 { 4376 struct bonding *bond = netdev_priv(bond_dev); 4377 4378 /* initialize rwlocks */ 4379 rwlock_init(&bond->lock); 4380 rwlock_init(&bond->curr_slave_lock); 4381 4382 bond->params = bonding_defaults; 4383 4384 /* Initialize pointers */ 4385 bond->dev = bond_dev; 4386 INIT_LIST_HEAD(&bond->vlan_list); 4387 4388 /* Initialize the device entry points */ 4389 ether_setup(bond_dev); 4390 bond_dev->netdev_ops = &bond_netdev_ops; 4391 bond_dev->ethtool_ops = &bond_ethtool_ops; 4392 bond_set_mode_ops(bond, bond->params.mode); 4393 4394 bond_dev->destructor = bond_destructor; 4395 4396 /* Initialize the device options */ 4397 bond_dev->tx_queue_len = 0; 4398 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST; 4399 bond_dev->priv_flags |= IFF_BONDING; 4400 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 4401 4402 /* At first, we block adding VLANs. That's the only way to 4403 * prevent problems that occur when adding VLANs over an 4404 * empty bond. The block will be removed once non-challenged 4405 * slaves are enslaved. 4406 */ 4407 bond_dev->features |= NETIF_F_VLAN_CHALLENGED; 4408 4409 /* don't acquire bond device's netif_tx_lock when 4410 * transmitting */ 4411 bond_dev->features |= NETIF_F_LLTX; 4412 4413 /* By default, we declare the bond to be fully 4414 * VLAN hardware accelerated capable. Special 4415 * care is taken in the various xmit functions 4416 * when there are slaves that are not hw accel 4417 * capable 4418 */ 4419 4420 bond_dev->hw_features = BOND_VLAN_FEATURES | 4421 NETIF_F_HW_VLAN_TX | 4422 NETIF_F_HW_VLAN_RX | 4423 NETIF_F_HW_VLAN_FILTER; 4424 4425 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_NO_CSUM); 4426 bond_dev->features |= bond_dev->hw_features; 4427 } 4428 4429 static void bond_work_cancel_all(struct bonding *bond) 4430 { 4431 write_lock_bh(&bond->lock); 4432 bond->kill_timers = 1; 4433 write_unlock_bh(&bond->lock); 4434 4435 if (bond->params.miimon && delayed_work_pending(&bond->mii_work)) 4436 cancel_delayed_work(&bond->mii_work); 4437 4438 if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work)) 4439 cancel_delayed_work(&bond->arp_work); 4440 4441 if (bond->params.mode == BOND_MODE_ALB && 4442 delayed_work_pending(&bond->alb_work)) 4443 cancel_delayed_work(&bond->alb_work); 4444 4445 if (bond->params.mode == BOND_MODE_8023AD && 4446 delayed_work_pending(&bond->ad_work)) 4447 cancel_delayed_work(&bond->ad_work); 4448 4449 if (delayed_work_pending(&bond->mcast_work)) 4450 cancel_delayed_work(&bond->mcast_work); 4451 } 4452 4453 /* 4454 * Destroy a bonding device. 4455 * Must be under rtnl_lock when this function is called. 4456 */ 4457 static void bond_uninit(struct net_device *bond_dev) 4458 { 4459 struct bonding *bond = netdev_priv(bond_dev); 4460 struct vlan_entry *vlan, *tmp; 4461 4462 bond_netpoll_cleanup(bond_dev); 4463 4464 /* Release the bonded slaves */ 4465 bond_release_all(bond_dev); 4466 4467 list_del(&bond->bond_list); 4468 4469 bond_work_cancel_all(bond); 4470 4471 bond_remove_proc_entry(bond); 4472 4473 bond_debug_unregister(bond); 4474 4475 __hw_addr_flush(&bond->mc_list); 4476 4477 list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) { 4478 list_del(&vlan->vlan_list); 4479 kfree(vlan); 4480 } 4481 } 4482 4483 /*------------------------- Module initialization ---------------------------*/ 4484 4485 /* 4486 * Convert string input module parms. Accept either the 4487 * number of the mode or its string name. A bit complicated because 4488 * some mode names are substrings of other names, and calls from sysfs 4489 * may have whitespace in the name (trailing newlines, for example). 4490 */ 4491 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl) 4492 { 4493 int modeint = -1, i, rv; 4494 char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, }; 4495 4496 for (p = (char *)buf; *p; p++) 4497 if (!(isdigit(*p) || isspace(*p))) 4498 break; 4499 4500 if (*p) 4501 rv = sscanf(buf, "%20s", modestr); 4502 else 4503 rv = sscanf(buf, "%d", &modeint); 4504 4505 if (!rv) 4506 return -1; 4507 4508 for (i = 0; tbl[i].modename; i++) { 4509 if (modeint == tbl[i].mode) 4510 return tbl[i].mode; 4511 if (strcmp(modestr, tbl[i].modename) == 0) 4512 return tbl[i].mode; 4513 } 4514 4515 return -1; 4516 } 4517 4518 static int bond_check_params(struct bond_params *params) 4519 { 4520 int arp_validate_value, fail_over_mac_value, primary_reselect_value; 4521 4522 /* 4523 * Convert string parameters. 4524 */ 4525 if (mode) { 4526 bond_mode = bond_parse_parm(mode, bond_mode_tbl); 4527 if (bond_mode == -1) { 4528 pr_err("Error: Invalid bonding mode \"%s\"\n", 4529 mode == NULL ? "NULL" : mode); 4530 return -EINVAL; 4531 } 4532 } 4533 4534 if (xmit_hash_policy) { 4535 if ((bond_mode != BOND_MODE_XOR) && 4536 (bond_mode != BOND_MODE_8023AD)) { 4537 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 4538 bond_mode_name(bond_mode)); 4539 } else { 4540 xmit_hashtype = bond_parse_parm(xmit_hash_policy, 4541 xmit_hashtype_tbl); 4542 if (xmit_hashtype == -1) { 4543 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 4544 xmit_hash_policy == NULL ? "NULL" : 4545 xmit_hash_policy); 4546 return -EINVAL; 4547 } 4548 } 4549 } 4550 4551 if (lacp_rate) { 4552 if (bond_mode != BOND_MODE_8023AD) { 4553 pr_info("lacp_rate param is irrelevant in mode %s\n", 4554 bond_mode_name(bond_mode)); 4555 } else { 4556 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl); 4557 if (lacp_fast == -1) { 4558 pr_err("Error: Invalid lacp rate \"%s\"\n", 4559 lacp_rate == NULL ? "NULL" : lacp_rate); 4560 return -EINVAL; 4561 } 4562 } 4563 } 4564 4565 if (ad_select) { 4566 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl); 4567 if (params->ad_select == -1) { 4568 pr_err("Error: Invalid ad_select \"%s\"\n", 4569 ad_select == NULL ? "NULL" : ad_select); 4570 return -EINVAL; 4571 } 4572 4573 if (bond_mode != BOND_MODE_8023AD) { 4574 pr_warning("ad_select param only affects 802.3ad mode\n"); 4575 } 4576 } else { 4577 params->ad_select = BOND_AD_STABLE; 4578 } 4579 4580 if (max_bonds < 0) { 4581 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 4582 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 4583 max_bonds = BOND_DEFAULT_MAX_BONDS; 4584 } 4585 4586 if (miimon < 0) { 4587 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n", 4588 miimon, INT_MAX, BOND_LINK_MON_INTERV); 4589 miimon = BOND_LINK_MON_INTERV; 4590 } 4591 4592 if (updelay < 0) { 4593 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4594 updelay, INT_MAX); 4595 updelay = 0; 4596 } 4597 4598 if (downdelay < 0) { 4599 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4600 downdelay, INT_MAX); 4601 downdelay = 0; 4602 } 4603 4604 if ((use_carrier != 0) && (use_carrier != 1)) { 4605 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 4606 use_carrier); 4607 use_carrier = 1; 4608 } 4609 4610 if (num_peer_notif < 0 || num_peer_notif > 255) { 4611 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 4612 num_peer_notif); 4613 num_peer_notif = 1; 4614 } 4615 4616 /* reset values for 802.3ad */ 4617 if (bond_mode == BOND_MODE_8023AD) { 4618 if (!miimon) { 4619 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"); 4620 pr_warning("Forcing miimon to 100msec\n"); 4621 miimon = 100; 4622 } 4623 } 4624 4625 if (tx_queues < 1 || tx_queues > 255) { 4626 pr_warning("Warning: tx_queues (%d) should be between " 4627 "1 and 255, resetting to %d\n", 4628 tx_queues, BOND_DEFAULT_TX_QUEUES); 4629 tx_queues = BOND_DEFAULT_TX_QUEUES; 4630 } 4631 4632 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 4633 pr_warning("Warning: all_slaves_active module parameter (%d), " 4634 "not of valid value (0/1), so it was set to " 4635 "0\n", all_slaves_active); 4636 all_slaves_active = 0; 4637 } 4638 4639 if (resend_igmp < 0 || resend_igmp > 255) { 4640 pr_warning("Warning: resend_igmp (%d) should be between " 4641 "0 and 255, resetting to %d\n", 4642 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 4643 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 4644 } 4645 4646 /* reset values for TLB/ALB */ 4647 if ((bond_mode == BOND_MODE_TLB) || 4648 (bond_mode == BOND_MODE_ALB)) { 4649 if (!miimon) { 4650 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"); 4651 pr_warning("Forcing miimon to 100msec\n"); 4652 miimon = 100; 4653 } 4654 } 4655 4656 if (bond_mode == BOND_MODE_ALB) { 4657 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", 4658 updelay); 4659 } 4660 4661 if (!miimon) { 4662 if (updelay || downdelay) { 4663 /* just warn the user the up/down delay will have 4664 * no effect since miimon is zero... 4665 */ 4666 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", 4667 updelay, downdelay); 4668 } 4669 } else { 4670 /* don't allow arp monitoring */ 4671 if (arp_interval) { 4672 pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 4673 miimon, arp_interval); 4674 arp_interval = 0; 4675 } 4676 4677 if ((updelay % miimon) != 0) { 4678 pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 4679 updelay, miimon, 4680 (updelay / miimon) * miimon); 4681 } 4682 4683 updelay /= miimon; 4684 4685 if ((downdelay % miimon) != 0) { 4686 pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 4687 downdelay, miimon, 4688 (downdelay / miimon) * miimon); 4689 } 4690 4691 downdelay /= miimon; 4692 } 4693 4694 if (arp_interval < 0) { 4695 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n", 4696 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV); 4697 arp_interval = BOND_LINK_ARP_INTERV; 4698 } 4699 4700 for (arp_ip_count = 0; 4701 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count]; 4702 arp_ip_count++) { 4703 /* not complete check, but should be good enough to 4704 catch mistakes */ 4705 if (!isdigit(arp_ip_target[arp_ip_count][0])) { 4706 pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 4707 arp_ip_target[arp_ip_count]); 4708 arp_interval = 0; 4709 } else { 4710 __be32 ip = in_aton(arp_ip_target[arp_ip_count]); 4711 arp_target[arp_ip_count] = ip; 4712 } 4713 } 4714 4715 if (arp_interval && !arp_ip_count) { 4716 /* don't allow arping if no arp_ip_target given... */ 4717 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 4718 arp_interval); 4719 arp_interval = 0; 4720 } 4721 4722 if (arp_validate) { 4723 if (bond_mode != BOND_MODE_ACTIVEBACKUP) { 4724 pr_err("arp_validate only supported in active-backup mode\n"); 4725 return -EINVAL; 4726 } 4727 if (!arp_interval) { 4728 pr_err("arp_validate requires arp_interval\n"); 4729 return -EINVAL; 4730 } 4731 4732 arp_validate_value = bond_parse_parm(arp_validate, 4733 arp_validate_tbl); 4734 if (arp_validate_value == -1) { 4735 pr_err("Error: invalid arp_validate \"%s\"\n", 4736 arp_validate == NULL ? "NULL" : arp_validate); 4737 return -EINVAL; 4738 } 4739 } else 4740 arp_validate_value = 0; 4741 4742 if (miimon) { 4743 pr_info("MII link monitoring set to %d ms\n", miimon); 4744 } else if (arp_interval) { 4745 int i; 4746 4747 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 4748 arp_interval, 4749 arp_validate_tbl[arp_validate_value].modename, 4750 arp_ip_count); 4751 4752 for (i = 0; i < arp_ip_count; i++) 4753 pr_info(" %s", arp_ip_target[i]); 4754 4755 pr_info("\n"); 4756 4757 } else if (max_bonds) { 4758 /* miimon and arp_interval not set, we need one so things 4759 * work as expected, see bonding.txt for details 4760 */ 4761 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"); 4762 } 4763 4764 if (primary && !USES_PRIMARY(bond_mode)) { 4765 /* currently, using a primary only makes sense 4766 * in active backup, TLB or ALB modes 4767 */ 4768 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n", 4769 primary, bond_mode_name(bond_mode)); 4770 primary = NULL; 4771 } 4772 4773 if (primary && primary_reselect) { 4774 primary_reselect_value = bond_parse_parm(primary_reselect, 4775 pri_reselect_tbl); 4776 if (primary_reselect_value == -1) { 4777 pr_err("Error: Invalid primary_reselect \"%s\"\n", 4778 primary_reselect == 4779 NULL ? "NULL" : primary_reselect); 4780 return -EINVAL; 4781 } 4782 } else { 4783 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 4784 } 4785 4786 if (fail_over_mac) { 4787 fail_over_mac_value = bond_parse_parm(fail_over_mac, 4788 fail_over_mac_tbl); 4789 if (fail_over_mac_value == -1) { 4790 pr_err("Error: invalid fail_over_mac \"%s\"\n", 4791 arp_validate == NULL ? "NULL" : arp_validate); 4792 return -EINVAL; 4793 } 4794 4795 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 4796 pr_warning("Warning: fail_over_mac only affects active-backup mode.\n"); 4797 } else { 4798 fail_over_mac_value = BOND_FOM_NONE; 4799 } 4800 4801 /* fill params struct with the proper values */ 4802 params->mode = bond_mode; 4803 params->xmit_policy = xmit_hashtype; 4804 params->miimon = miimon; 4805 params->num_peer_notif = num_peer_notif; 4806 params->arp_interval = arp_interval; 4807 params->arp_validate = arp_validate_value; 4808 params->updelay = updelay; 4809 params->downdelay = downdelay; 4810 params->use_carrier = use_carrier; 4811 params->lacp_fast = lacp_fast; 4812 params->primary[0] = 0; 4813 params->primary_reselect = primary_reselect_value; 4814 params->fail_over_mac = fail_over_mac_value; 4815 params->tx_queues = tx_queues; 4816 params->all_slaves_active = all_slaves_active; 4817 params->resend_igmp = resend_igmp; 4818 4819 if (primary) { 4820 strncpy(params->primary, primary, IFNAMSIZ); 4821 params->primary[IFNAMSIZ - 1] = 0; 4822 } 4823 4824 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 4825 4826 return 0; 4827 } 4828 4829 static struct lock_class_key bonding_netdev_xmit_lock_key; 4830 static struct lock_class_key bonding_netdev_addr_lock_key; 4831 4832 static void bond_set_lockdep_class_one(struct net_device *dev, 4833 struct netdev_queue *txq, 4834 void *_unused) 4835 { 4836 lockdep_set_class(&txq->_xmit_lock, 4837 &bonding_netdev_xmit_lock_key); 4838 } 4839 4840 static void bond_set_lockdep_class(struct net_device *dev) 4841 { 4842 lockdep_set_class(&dev->addr_list_lock, 4843 &bonding_netdev_addr_lock_key); 4844 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL); 4845 } 4846 4847 /* 4848 * Called from registration process 4849 */ 4850 static int bond_init(struct net_device *bond_dev) 4851 { 4852 struct bonding *bond = netdev_priv(bond_dev); 4853 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 4854 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); 4855 4856 pr_debug("Begin bond_init for %s\n", bond_dev->name); 4857 4858 /* 4859 * Initialize locks that may be required during 4860 * en/deslave operations. All of the bond_open work 4861 * (of which this is part) should really be moved to 4862 * a phase prior to dev_open 4863 */ 4864 spin_lock_init(&(bond_info->tx_hashtbl_lock)); 4865 spin_lock_init(&(bond_info->rx_hashtbl_lock)); 4866 4867 bond->wq = create_singlethread_workqueue(bond_dev->name); 4868 if (!bond->wq) 4869 return -ENOMEM; 4870 4871 bond_set_lockdep_class(bond_dev); 4872 4873 bond_create_proc_entry(bond); 4874 list_add_tail(&bond->bond_list, &bn->dev_list); 4875 4876 bond_prepare_sysfs_group(bond); 4877 4878 bond_debug_register(bond); 4879 4880 __hw_addr_init(&bond->mc_list); 4881 return 0; 4882 } 4883 4884 static int bond_validate(struct nlattr *tb[], struct nlattr *data[]) 4885 { 4886 if (tb[IFLA_ADDRESS]) { 4887 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 4888 return -EINVAL; 4889 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 4890 return -EADDRNOTAVAIL; 4891 } 4892 return 0; 4893 } 4894 4895 static struct rtnl_link_ops bond_link_ops __read_mostly = { 4896 .kind = "bond", 4897 .priv_size = sizeof(struct bonding), 4898 .setup = bond_setup, 4899 .validate = bond_validate, 4900 }; 4901 4902 /* Create a new bond based on the specified name and bonding parameters. 4903 * If name is NULL, obtain a suitable "bond%d" name for us. 4904 * Caller must NOT hold rtnl_lock; we need to release it here before we 4905 * set up our sysfs entries. 4906 */ 4907 int bond_create(struct net *net, const char *name) 4908 { 4909 struct net_device *bond_dev; 4910 int res; 4911 4912 rtnl_lock(); 4913 4914 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 4915 name ? name : "bond%d", 4916 bond_setup, tx_queues); 4917 if (!bond_dev) { 4918 pr_err("%s: eek! can't alloc netdev!\n", name); 4919 rtnl_unlock(); 4920 return -ENOMEM; 4921 } 4922 4923 dev_net_set(bond_dev, net); 4924 bond_dev->rtnl_link_ops = &bond_link_ops; 4925 4926 res = register_netdevice(bond_dev); 4927 4928 netif_carrier_off(bond_dev); 4929 4930 rtnl_unlock(); 4931 if (res < 0) 4932 bond_destructor(bond_dev); 4933 return res; 4934 } 4935 4936 static int __net_init bond_net_init(struct net *net) 4937 { 4938 struct bond_net *bn = net_generic(net, bond_net_id); 4939 4940 bn->net = net; 4941 INIT_LIST_HEAD(&bn->dev_list); 4942 4943 bond_create_proc_dir(bn); 4944 4945 return 0; 4946 } 4947 4948 static void __net_exit bond_net_exit(struct net *net) 4949 { 4950 struct bond_net *bn = net_generic(net, bond_net_id); 4951 4952 bond_destroy_proc_dir(bn); 4953 } 4954 4955 static struct pernet_operations bond_net_ops = { 4956 .init = bond_net_init, 4957 .exit = bond_net_exit, 4958 .id = &bond_net_id, 4959 .size = sizeof(struct bond_net), 4960 }; 4961 4962 static int __init bonding_init(void) 4963 { 4964 int i; 4965 int res; 4966 4967 pr_info("%s", bond_version); 4968 4969 res = bond_check_params(&bonding_defaults); 4970 if (res) 4971 goto out; 4972 4973 res = register_pernet_subsys(&bond_net_ops); 4974 if (res) 4975 goto out; 4976 4977 res = rtnl_link_register(&bond_link_ops); 4978 if (res) 4979 goto err_link; 4980 4981 bond_create_debugfs(); 4982 4983 for (i = 0; i < max_bonds; i++) { 4984 res = bond_create(&init_net, NULL); 4985 if (res) 4986 goto err; 4987 } 4988 4989 res = bond_create_sysfs(); 4990 if (res) 4991 goto err; 4992 4993 register_netdevice_notifier(&bond_netdev_notifier); 4994 register_inetaddr_notifier(&bond_inetaddr_notifier); 4995 out: 4996 return res; 4997 err: 4998 rtnl_link_unregister(&bond_link_ops); 4999 err_link: 5000 unregister_pernet_subsys(&bond_net_ops); 5001 goto out; 5002 5003 } 5004 5005 static void __exit bonding_exit(void) 5006 { 5007 unregister_netdevice_notifier(&bond_netdev_notifier); 5008 unregister_inetaddr_notifier(&bond_inetaddr_notifier); 5009 5010 bond_destroy_sysfs(); 5011 bond_destroy_debugfs(); 5012 5013 rtnl_link_unregister(&bond_link_ops); 5014 unregister_pernet_subsys(&bond_net_ops); 5015 5016 #ifdef CONFIG_NET_POLL_CONTROLLER 5017 /* 5018 * Make sure we don't have an imbalance on our netpoll blocking 5019 */ 5020 WARN_ON(atomic_read(&netpoll_block_tx)); 5021 #endif 5022 } 5023 5024 module_init(bonding_init); 5025 module_exit(bonding_exit); 5026 MODULE_LICENSE("GPL"); 5027 MODULE_VERSION(DRV_VERSION); 5028 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION); 5029 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 5030 MODULE_ALIAS_RTNL_LINK("bond"); 5031