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 int min_links; 102 static char *ad_select; 103 static char *xmit_hash_policy; 104 static int arp_interval = BOND_LINK_ARP_INTERV; 105 static char *arp_ip_target[BOND_MAX_ARP_TARGETS]; 106 static char *arp_validate; 107 static char *fail_over_mac; 108 static int all_slaves_active = 0; 109 static struct bond_params bonding_defaults; 110 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP; 111 112 module_param(max_bonds, int, 0); 113 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices"); 114 module_param(tx_queues, int, 0); 115 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)"); 116 module_param_named(num_grat_arp, num_peer_notif, int, 0644); 117 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on " 118 "failover event (alias of num_unsol_na)"); 119 module_param_named(num_unsol_na, num_peer_notif, int, 0644); 120 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on " 121 "failover event (alias of num_grat_arp)"); 122 module_param(miimon, int, 0); 123 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds"); 124 module_param(updelay, int, 0); 125 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds"); 126 module_param(downdelay, int, 0); 127 MODULE_PARM_DESC(downdelay, "Delay before considering link down, " 128 "in milliseconds"); 129 module_param(use_carrier, int, 0); 130 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; " 131 "0 for off, 1 for on (default)"); 132 module_param(mode, charp, 0); 133 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, " 134 "1 for active-backup, 2 for balance-xor, " 135 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, " 136 "6 for balance-alb"); 137 module_param(primary, charp, 0); 138 MODULE_PARM_DESC(primary, "Primary network device to use"); 139 module_param(primary_reselect, charp, 0); 140 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave " 141 "once it comes up; " 142 "0 for always (default), " 143 "1 for only if speed of primary is " 144 "better, " 145 "2 for only on active slave " 146 "failure"); 147 module_param(lacp_rate, charp, 0); 148 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; " 149 "0 for slow, 1 for fast"); 150 module_param(ad_select, charp, 0); 151 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; " 152 "0 for stable (default), 1 for bandwidth, " 153 "2 for count"); 154 module_param(min_links, int, 0); 155 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier"); 156 157 module_param(xmit_hash_policy, charp, 0); 158 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; " 159 "0 for layer 2 (default), 1 for layer 3+4, " 160 "2 for layer 2+3"); 161 module_param(arp_interval, int, 0); 162 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds"); 163 module_param_array(arp_ip_target, charp, NULL, 0); 164 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form"); 165 module_param(arp_validate, charp, 0); 166 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; " 167 "0 for none (default), 1 for active, " 168 "2 for backup, 3 for all"); 169 module_param(fail_over_mac, charp, 0); 170 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to " 171 "the same MAC; 0 for none (default), " 172 "1 for active, 2 for follow"); 173 module_param(all_slaves_active, int, 0); 174 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface" 175 "by setting active flag for all slaves; " 176 "0 for never (default), 1 for always."); 177 module_param(resend_igmp, int, 0); 178 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on " 179 "link failure"); 180 181 /*----------------------------- Global variables ----------------------------*/ 182 183 #ifdef CONFIG_NET_POLL_CONTROLLER 184 atomic_t netpoll_block_tx = ATOMIC_INIT(0); 185 #endif 186 187 int bond_net_id __read_mostly; 188 189 static __be32 arp_target[BOND_MAX_ARP_TARGETS]; 190 static int arp_ip_count; 191 static int bond_mode = BOND_MODE_ROUNDROBIN; 192 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2; 193 static int lacp_fast; 194 195 const struct bond_parm_tbl bond_lacp_tbl[] = { 196 { "slow", AD_LACP_SLOW}, 197 { "fast", AD_LACP_FAST}, 198 { NULL, -1}, 199 }; 200 201 const struct bond_parm_tbl bond_mode_tbl[] = { 202 { "balance-rr", BOND_MODE_ROUNDROBIN}, 203 { "active-backup", BOND_MODE_ACTIVEBACKUP}, 204 { "balance-xor", BOND_MODE_XOR}, 205 { "broadcast", BOND_MODE_BROADCAST}, 206 { "802.3ad", BOND_MODE_8023AD}, 207 { "balance-tlb", BOND_MODE_TLB}, 208 { "balance-alb", BOND_MODE_ALB}, 209 { NULL, -1}, 210 }; 211 212 const struct bond_parm_tbl xmit_hashtype_tbl[] = { 213 { "layer2", BOND_XMIT_POLICY_LAYER2}, 214 { "layer3+4", BOND_XMIT_POLICY_LAYER34}, 215 { "layer2+3", BOND_XMIT_POLICY_LAYER23}, 216 { NULL, -1}, 217 }; 218 219 const struct bond_parm_tbl arp_validate_tbl[] = { 220 { "none", BOND_ARP_VALIDATE_NONE}, 221 { "active", BOND_ARP_VALIDATE_ACTIVE}, 222 { "backup", BOND_ARP_VALIDATE_BACKUP}, 223 { "all", BOND_ARP_VALIDATE_ALL}, 224 { NULL, -1}, 225 }; 226 227 const struct bond_parm_tbl fail_over_mac_tbl[] = { 228 { "none", BOND_FOM_NONE}, 229 { "active", BOND_FOM_ACTIVE}, 230 { "follow", BOND_FOM_FOLLOW}, 231 { NULL, -1}, 232 }; 233 234 const struct bond_parm_tbl pri_reselect_tbl[] = { 235 { "always", BOND_PRI_RESELECT_ALWAYS}, 236 { "better", BOND_PRI_RESELECT_BETTER}, 237 { "failure", BOND_PRI_RESELECT_FAILURE}, 238 { NULL, -1}, 239 }; 240 241 struct bond_parm_tbl ad_select_tbl[] = { 242 { "stable", BOND_AD_STABLE}, 243 { "bandwidth", BOND_AD_BANDWIDTH}, 244 { "count", BOND_AD_COUNT}, 245 { NULL, -1}, 246 }; 247 248 /*-------------------------- Forward declarations ---------------------------*/ 249 250 static int bond_init(struct net_device *bond_dev); 251 static void bond_uninit(struct net_device *bond_dev); 252 253 /*---------------------------- General routines -----------------------------*/ 254 255 const char *bond_mode_name(int mode) 256 { 257 static const char *names[] = { 258 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)", 259 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)", 260 [BOND_MODE_XOR] = "load balancing (xor)", 261 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)", 262 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation", 263 [BOND_MODE_TLB] = "transmit load balancing", 264 [BOND_MODE_ALB] = "adaptive load balancing", 265 }; 266 267 if (mode < 0 || mode > BOND_MODE_ALB) 268 return "unknown"; 269 270 return names[mode]; 271 } 272 273 /*---------------------------------- VLAN -----------------------------------*/ 274 275 /** 276 * bond_add_vlan - add a new vlan id on bond 277 * @bond: bond that got the notification 278 * @vlan_id: the vlan id to add 279 * 280 * Returns -ENOMEM if allocation failed. 281 */ 282 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id) 283 { 284 struct vlan_entry *vlan; 285 286 pr_debug("bond: %s, vlan id %d\n", 287 (bond ? bond->dev->name : "None"), vlan_id); 288 289 vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL); 290 if (!vlan) 291 return -ENOMEM; 292 293 INIT_LIST_HEAD(&vlan->vlan_list); 294 vlan->vlan_id = vlan_id; 295 296 write_lock_bh(&bond->lock); 297 298 list_add_tail(&vlan->vlan_list, &bond->vlan_list); 299 300 write_unlock_bh(&bond->lock); 301 302 pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name); 303 304 return 0; 305 } 306 307 /** 308 * bond_del_vlan - delete a vlan id from bond 309 * @bond: bond that got the notification 310 * @vlan_id: the vlan id to delete 311 * 312 * returns -ENODEV if @vlan_id was not found in @bond. 313 */ 314 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id) 315 { 316 struct vlan_entry *vlan; 317 int res = -ENODEV; 318 319 pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id); 320 321 block_netpoll_tx(); 322 write_lock_bh(&bond->lock); 323 324 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 325 if (vlan->vlan_id == vlan_id) { 326 list_del(&vlan->vlan_list); 327 328 if (bond_is_lb(bond)) 329 bond_alb_clear_vlan(bond, vlan_id); 330 331 pr_debug("removed VLAN ID %d from bond %s\n", 332 vlan_id, bond->dev->name); 333 334 kfree(vlan); 335 336 res = 0; 337 goto out; 338 } 339 } 340 341 pr_debug("couldn't find VLAN ID %d in bond %s\n", 342 vlan_id, bond->dev->name); 343 344 out: 345 write_unlock_bh(&bond->lock); 346 unblock_netpoll_tx(); 347 return res; 348 } 349 350 /** 351 * bond_next_vlan - safely skip to the next item in the vlans list. 352 * @bond: the bond we're working on 353 * @curr: item we're advancing from 354 * 355 * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL, 356 * or @curr->next otherwise (even if it is @curr itself again). 357 * 358 * Caller must hold bond->lock 359 */ 360 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr) 361 { 362 struct vlan_entry *next, *last; 363 364 if (list_empty(&bond->vlan_list)) 365 return NULL; 366 367 if (!curr) { 368 next = list_entry(bond->vlan_list.next, 369 struct vlan_entry, vlan_list); 370 } else { 371 last = list_entry(bond->vlan_list.prev, 372 struct vlan_entry, vlan_list); 373 if (last == curr) { 374 next = list_entry(bond->vlan_list.next, 375 struct vlan_entry, vlan_list); 376 } else { 377 next = list_entry(curr->vlan_list.next, 378 struct vlan_entry, vlan_list); 379 } 380 } 381 382 return next; 383 } 384 385 #define bond_queue_mapping(skb) (*(u16 *)((skb)->cb)) 386 387 /** 388 * bond_dev_queue_xmit - Prepare skb for xmit. 389 * 390 * @bond: bond device that got this skb for tx. 391 * @skb: hw accel VLAN tagged skb to transmit 392 * @slave_dev: slave that is supposed to xmit this skbuff 393 */ 394 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, 395 struct net_device *slave_dev) 396 { 397 skb->dev = slave_dev; 398 skb->priority = 1; 399 400 skb->queue_mapping = bond_queue_mapping(skb); 401 402 if (unlikely(netpoll_tx_running(slave_dev))) 403 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb); 404 else 405 dev_queue_xmit(skb); 406 407 return 0; 408 } 409 410 /* 411 * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid, 412 * We don't protect the slave list iteration with a lock because: 413 * a. This operation is performed in IOCTL context, 414 * b. The operation is protected by the RTNL semaphore in the 8021q code, 415 * c. Holding a lock with BH disabled while directly calling a base driver 416 * entry point is generally a BAD idea. 417 * 418 * The design of synchronization/protection for this operation in the 8021q 419 * module is good for one or more VLAN devices over a single physical device 420 * and cannot be extended for a teaming solution like bonding, so there is a 421 * potential race condition here where a net device from the vlan group might 422 * be referenced (either by a base driver or the 8021q code) while it is being 423 * removed from the system. However, it turns out we're not making matters 424 * worse, and if it works for regular VLAN usage it will work here too. 425 */ 426 427 /** 428 * bond_vlan_rx_add_vid - Propagates adding an id to slaves 429 * @bond_dev: bonding net device that got called 430 * @vid: vlan id being added 431 */ 432 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid) 433 { 434 struct bonding *bond = netdev_priv(bond_dev); 435 struct slave *slave; 436 int i, res; 437 438 bond_for_each_slave(bond, slave, i) { 439 struct net_device *slave_dev = slave->dev; 440 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 441 442 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) && 443 slave_ops->ndo_vlan_rx_add_vid) { 444 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid); 445 } 446 } 447 448 res = bond_add_vlan(bond, vid); 449 if (res) { 450 pr_err("%s: Error: Failed to add vlan id %d\n", 451 bond_dev->name, vid); 452 } 453 } 454 455 /** 456 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves 457 * @bond_dev: bonding net device that got called 458 * @vid: vlan id being removed 459 */ 460 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid) 461 { 462 struct bonding *bond = netdev_priv(bond_dev); 463 struct slave *slave; 464 int i, res; 465 466 bond_for_each_slave(bond, slave, i) { 467 struct net_device *slave_dev = slave->dev; 468 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 469 470 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) && 471 slave_ops->ndo_vlan_rx_kill_vid) { 472 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid); 473 } 474 } 475 476 res = bond_del_vlan(bond, vid); 477 if (res) { 478 pr_err("%s: Error: Failed to remove vlan id %d\n", 479 bond_dev->name, vid); 480 } 481 } 482 483 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev) 484 { 485 struct vlan_entry *vlan; 486 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 487 488 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) || 489 !(slave_ops->ndo_vlan_rx_add_vid)) 490 return; 491 492 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) 493 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id); 494 } 495 496 static void bond_del_vlans_from_slave(struct bonding *bond, 497 struct net_device *slave_dev) 498 { 499 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 500 struct vlan_entry *vlan; 501 502 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) || 503 !(slave_ops->ndo_vlan_rx_kill_vid)) 504 return; 505 506 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 507 if (!vlan->vlan_id) 508 continue; 509 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id); 510 } 511 } 512 513 /*------------------------------- Link status -------------------------------*/ 514 515 /* 516 * Set the carrier state for the master according to the state of its 517 * slaves. If any slaves are up, the master is up. In 802.3ad mode, 518 * do special 802.3ad magic. 519 * 520 * Returns zero if carrier state does not change, nonzero if it does. 521 */ 522 static int bond_set_carrier(struct bonding *bond) 523 { 524 struct slave *slave; 525 int i; 526 527 if (bond->slave_cnt == 0) 528 goto down; 529 530 if (bond->params.mode == BOND_MODE_8023AD) 531 return bond_3ad_set_carrier(bond); 532 533 bond_for_each_slave(bond, slave, i) { 534 if (slave->link == BOND_LINK_UP) { 535 if (!netif_carrier_ok(bond->dev)) { 536 netif_carrier_on(bond->dev); 537 return 1; 538 } 539 return 0; 540 } 541 } 542 543 down: 544 if (netif_carrier_ok(bond->dev)) { 545 netif_carrier_off(bond->dev); 546 return 1; 547 } 548 return 0; 549 } 550 551 /* 552 * Get link speed and duplex from the slave's base driver 553 * using ethtool. If for some reason the call fails or the 554 * values are invalid, fake speed and duplex to 100/Full 555 * and return error. 556 */ 557 static int bond_update_speed_duplex(struct slave *slave) 558 { 559 struct net_device *slave_dev = slave->dev; 560 struct ethtool_cmd etool = { .cmd = ETHTOOL_GSET }; 561 u32 slave_speed; 562 int res; 563 564 /* Fake speed and duplex */ 565 slave->speed = SPEED_100; 566 slave->duplex = DUPLEX_FULL; 567 568 if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings) 569 return -1; 570 571 res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool); 572 if (res < 0) 573 return -1; 574 575 slave_speed = ethtool_cmd_speed(&etool); 576 if (slave_speed == 0 || slave_speed == ((__u32) -1)) 577 return -1; 578 579 switch (etool.duplex) { 580 case DUPLEX_FULL: 581 case DUPLEX_HALF: 582 break; 583 default: 584 return -1; 585 } 586 587 slave->speed = slave_speed; 588 slave->duplex = etool.duplex; 589 590 return 0; 591 } 592 593 /* 594 * if <dev> supports MII link status reporting, check its link status. 595 * 596 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), 597 * depending upon the setting of the use_carrier parameter. 598 * 599 * Return either BMSR_LSTATUS, meaning that the link is up (or we 600 * can't tell and just pretend it is), or 0, meaning that the link is 601 * down. 602 * 603 * If reporting is non-zero, instead of faking link up, return -1 if 604 * both ETHTOOL and MII ioctls fail (meaning the device does not 605 * support them). If use_carrier is set, return whatever it says. 606 * It'd be nice if there was a good way to tell if a driver supports 607 * netif_carrier, but there really isn't. 608 */ 609 static int bond_check_dev_link(struct bonding *bond, 610 struct net_device *slave_dev, int reporting) 611 { 612 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 613 int (*ioctl)(struct net_device *, struct ifreq *, int); 614 struct ifreq ifr; 615 struct mii_ioctl_data *mii; 616 617 if (!reporting && !netif_running(slave_dev)) 618 return 0; 619 620 if (bond->params.use_carrier) 621 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; 622 623 /* Try to get link status using Ethtool first. */ 624 if (slave_dev->ethtool_ops) { 625 if (slave_dev->ethtool_ops->get_link) { 626 u32 link; 627 628 link = slave_dev->ethtool_ops->get_link(slave_dev); 629 630 return link ? BMSR_LSTATUS : 0; 631 } 632 } 633 634 /* Ethtool can't be used, fallback to MII ioctls. */ 635 ioctl = slave_ops->ndo_do_ioctl; 636 if (ioctl) { 637 /* TODO: set pointer to correct ioctl on a per team member */ 638 /* bases to make this more efficient. that is, once */ 639 /* we determine the correct ioctl, we will always */ 640 /* call it and not the others for that team */ 641 /* member. */ 642 643 /* 644 * We cannot assume that SIOCGMIIPHY will also read a 645 * register; not all network drivers (e.g., e100) 646 * support that. 647 */ 648 649 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ 650 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ); 651 mii = if_mii(&ifr); 652 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) { 653 mii->reg_num = MII_BMSR; 654 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) 655 return mii->val_out & BMSR_LSTATUS; 656 } 657 } 658 659 /* 660 * If reporting, report that either there's no dev->do_ioctl, 661 * or both SIOCGMIIREG and get_link failed (meaning that we 662 * cannot report link status). If not reporting, pretend 663 * we're ok. 664 */ 665 return reporting ? -1 : BMSR_LSTATUS; 666 } 667 668 /*----------------------------- Multicast list ------------------------------*/ 669 670 /* 671 * Push the promiscuity flag down to appropriate slaves 672 */ 673 static int bond_set_promiscuity(struct bonding *bond, int inc) 674 { 675 int err = 0; 676 if (USES_PRIMARY(bond->params.mode)) { 677 /* write lock already acquired */ 678 if (bond->curr_active_slave) { 679 err = dev_set_promiscuity(bond->curr_active_slave->dev, 680 inc); 681 } 682 } else { 683 struct slave *slave; 684 int i; 685 bond_for_each_slave(bond, slave, i) { 686 err = dev_set_promiscuity(slave->dev, inc); 687 if (err) 688 return err; 689 } 690 } 691 return err; 692 } 693 694 /* 695 * Push the allmulti flag down to all slaves 696 */ 697 static int bond_set_allmulti(struct bonding *bond, int inc) 698 { 699 int err = 0; 700 if (USES_PRIMARY(bond->params.mode)) { 701 /* write lock already acquired */ 702 if (bond->curr_active_slave) { 703 err = dev_set_allmulti(bond->curr_active_slave->dev, 704 inc); 705 } 706 } else { 707 struct slave *slave; 708 int i; 709 bond_for_each_slave(bond, slave, i) { 710 err = dev_set_allmulti(slave->dev, inc); 711 if (err) 712 return err; 713 } 714 } 715 return err; 716 } 717 718 /* 719 * Add a Multicast address to slaves 720 * according to mode 721 */ 722 static void bond_mc_add(struct bonding *bond, void *addr) 723 { 724 if (USES_PRIMARY(bond->params.mode)) { 725 /* write lock already acquired */ 726 if (bond->curr_active_slave) 727 dev_mc_add(bond->curr_active_slave->dev, addr); 728 } else { 729 struct slave *slave; 730 int i; 731 732 bond_for_each_slave(bond, slave, i) 733 dev_mc_add(slave->dev, addr); 734 } 735 } 736 737 /* 738 * Remove a multicast address from slave 739 * according to mode 740 */ 741 static void bond_mc_del(struct bonding *bond, void *addr) 742 { 743 if (USES_PRIMARY(bond->params.mode)) { 744 /* write lock already acquired */ 745 if (bond->curr_active_slave) 746 dev_mc_del(bond->curr_active_slave->dev, addr); 747 } else { 748 struct slave *slave; 749 int i; 750 bond_for_each_slave(bond, slave, i) { 751 dev_mc_del(slave->dev, addr); 752 } 753 } 754 } 755 756 757 static void __bond_resend_igmp_join_requests(struct net_device *dev) 758 { 759 struct in_device *in_dev; 760 761 rcu_read_lock(); 762 in_dev = __in_dev_get_rcu(dev); 763 if (in_dev) 764 ip_mc_rejoin_groups(in_dev); 765 rcu_read_unlock(); 766 } 767 768 /* 769 * Retrieve the list of registered multicast addresses for the bonding 770 * device and retransmit an IGMP JOIN request to the current active 771 * slave. 772 */ 773 static void bond_resend_igmp_join_requests(struct bonding *bond) 774 { 775 struct net_device *vlan_dev; 776 struct vlan_entry *vlan; 777 778 read_lock(&bond->lock); 779 780 /* rejoin all groups on bond device */ 781 __bond_resend_igmp_join_requests(bond->dev); 782 783 /* rejoin all groups on vlan devices */ 784 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 785 rcu_read_lock(); 786 vlan_dev = __vlan_find_dev_deep(bond->dev, 787 vlan->vlan_id); 788 rcu_read_unlock(); 789 if (vlan_dev) 790 __bond_resend_igmp_join_requests(vlan_dev); 791 } 792 793 if (--bond->igmp_retrans > 0) 794 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); 795 796 read_unlock(&bond->lock); 797 } 798 799 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work) 800 { 801 struct bonding *bond = container_of(work, struct bonding, 802 mcast_work.work); 803 bond_resend_igmp_join_requests(bond); 804 } 805 806 /* 807 * flush all members of flush->mc_list from device dev->mc_list 808 */ 809 static void bond_mc_list_flush(struct net_device *bond_dev, 810 struct net_device *slave_dev) 811 { 812 struct bonding *bond = netdev_priv(bond_dev); 813 struct netdev_hw_addr *ha; 814 815 netdev_for_each_mc_addr(ha, bond_dev) 816 dev_mc_del(slave_dev, ha->addr); 817 818 if (bond->params.mode == BOND_MODE_8023AD) { 819 /* del lacpdu mc addr from mc list */ 820 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 821 822 dev_mc_del(slave_dev, lacpdu_multicast); 823 } 824 } 825 826 /*--------------------------- Active slave change ---------------------------*/ 827 828 /* 829 * Update the mc list and multicast-related flags for the new and 830 * old active slaves (if any) according to the multicast mode, and 831 * promiscuous flags unconditionally. 832 */ 833 static void bond_mc_swap(struct bonding *bond, struct slave *new_active, 834 struct slave *old_active) 835 { 836 struct netdev_hw_addr *ha; 837 838 if (!USES_PRIMARY(bond->params.mode)) 839 /* nothing to do - mc list is already up-to-date on 840 * all slaves 841 */ 842 return; 843 844 if (old_active) { 845 if (bond->dev->flags & IFF_PROMISC) 846 dev_set_promiscuity(old_active->dev, -1); 847 848 if (bond->dev->flags & IFF_ALLMULTI) 849 dev_set_allmulti(old_active->dev, -1); 850 851 netdev_for_each_mc_addr(ha, bond->dev) 852 dev_mc_del(old_active->dev, ha->addr); 853 } 854 855 if (new_active) { 856 /* FIXME: Signal errors upstream. */ 857 if (bond->dev->flags & IFF_PROMISC) 858 dev_set_promiscuity(new_active->dev, 1); 859 860 if (bond->dev->flags & IFF_ALLMULTI) 861 dev_set_allmulti(new_active->dev, 1); 862 863 netdev_for_each_mc_addr(ha, bond->dev) 864 dev_mc_add(new_active->dev, ha->addr); 865 } 866 } 867 868 /* 869 * bond_do_fail_over_mac 870 * 871 * Perform special MAC address swapping for fail_over_mac settings 872 * 873 * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh. 874 */ 875 static void bond_do_fail_over_mac(struct bonding *bond, 876 struct slave *new_active, 877 struct slave *old_active) 878 __releases(&bond->curr_slave_lock) 879 __releases(&bond->lock) 880 __acquires(&bond->lock) 881 __acquires(&bond->curr_slave_lock) 882 { 883 u8 tmp_mac[ETH_ALEN]; 884 struct sockaddr saddr; 885 int rv; 886 887 switch (bond->params.fail_over_mac) { 888 case BOND_FOM_ACTIVE: 889 if (new_active) 890 memcpy(bond->dev->dev_addr, new_active->dev->dev_addr, 891 new_active->dev->addr_len); 892 break; 893 case BOND_FOM_FOLLOW: 894 /* 895 * if new_active && old_active, swap them 896 * if just old_active, do nothing (going to no active slave) 897 * if just new_active, set new_active to bond's MAC 898 */ 899 if (!new_active) 900 return; 901 902 write_unlock_bh(&bond->curr_slave_lock); 903 read_unlock(&bond->lock); 904 905 if (old_active) { 906 memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN); 907 memcpy(saddr.sa_data, old_active->dev->dev_addr, 908 ETH_ALEN); 909 saddr.sa_family = new_active->dev->type; 910 } else { 911 memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN); 912 saddr.sa_family = bond->dev->type; 913 } 914 915 rv = dev_set_mac_address(new_active->dev, &saddr); 916 if (rv) { 917 pr_err("%s: Error %d setting MAC of slave %s\n", 918 bond->dev->name, -rv, new_active->dev->name); 919 goto out; 920 } 921 922 if (!old_active) 923 goto out; 924 925 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN); 926 saddr.sa_family = old_active->dev->type; 927 928 rv = dev_set_mac_address(old_active->dev, &saddr); 929 if (rv) 930 pr_err("%s: Error %d setting MAC of slave %s\n", 931 bond->dev->name, -rv, new_active->dev->name); 932 out: 933 read_lock(&bond->lock); 934 write_lock_bh(&bond->curr_slave_lock); 935 break; 936 default: 937 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n", 938 bond->dev->name, bond->params.fail_over_mac); 939 break; 940 } 941 942 } 943 944 static bool bond_should_change_active(struct bonding *bond) 945 { 946 struct slave *prim = bond->primary_slave; 947 struct slave *curr = bond->curr_active_slave; 948 949 if (!prim || !curr || curr->link != BOND_LINK_UP) 950 return true; 951 if (bond->force_primary) { 952 bond->force_primary = false; 953 return true; 954 } 955 if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER && 956 (prim->speed < curr->speed || 957 (prim->speed == curr->speed && prim->duplex <= curr->duplex))) 958 return false; 959 if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE) 960 return false; 961 return true; 962 } 963 964 /** 965 * find_best_interface - select the best available slave to be the active one 966 * @bond: our bonding struct 967 * 968 * Warning: Caller must hold curr_slave_lock for writing. 969 */ 970 static struct slave *bond_find_best_slave(struct bonding *bond) 971 { 972 struct slave *new_active, *old_active; 973 struct slave *bestslave = NULL; 974 int mintime = bond->params.updelay; 975 int i; 976 977 new_active = bond->curr_active_slave; 978 979 if (!new_active) { /* there were no active slaves left */ 980 if (bond->slave_cnt > 0) /* found one slave */ 981 new_active = bond->first_slave; 982 else 983 return NULL; /* still no slave, return NULL */ 984 } 985 986 if ((bond->primary_slave) && 987 bond->primary_slave->link == BOND_LINK_UP && 988 bond_should_change_active(bond)) { 989 new_active = bond->primary_slave; 990 } 991 992 /* remember where to stop iterating over the slaves */ 993 old_active = new_active; 994 995 bond_for_each_slave_from(bond, new_active, i, old_active) { 996 if (new_active->link == BOND_LINK_UP) { 997 return new_active; 998 } else if (new_active->link == BOND_LINK_BACK && 999 IS_UP(new_active->dev)) { 1000 /* link up, but waiting for stabilization */ 1001 if (new_active->delay < mintime) { 1002 mintime = new_active->delay; 1003 bestslave = new_active; 1004 } 1005 } 1006 } 1007 1008 return bestslave; 1009 } 1010 1011 static bool bond_should_notify_peers(struct bonding *bond) 1012 { 1013 struct slave *slave = bond->curr_active_slave; 1014 1015 pr_debug("bond_should_notify_peers: bond %s slave %s\n", 1016 bond->dev->name, slave ? slave->dev->name : "NULL"); 1017 1018 if (!slave || !bond->send_peer_notif || 1019 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) 1020 return false; 1021 1022 bond->send_peer_notif--; 1023 return true; 1024 } 1025 1026 /** 1027 * change_active_interface - change the active slave into the specified one 1028 * @bond: our bonding struct 1029 * @new: the new slave to make the active one 1030 * 1031 * Set the new slave to the bond's settings and unset them on the old 1032 * curr_active_slave. 1033 * Setting include flags, mc-list, promiscuity, allmulti, etc. 1034 * 1035 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, 1036 * because it is apparently the best available slave we have, even though its 1037 * updelay hasn't timed out yet. 1038 * 1039 * If new_active is not NULL, caller must hold bond->lock for read and 1040 * curr_slave_lock for write_bh. 1041 */ 1042 void bond_change_active_slave(struct bonding *bond, struct slave *new_active) 1043 { 1044 struct slave *old_active = bond->curr_active_slave; 1045 1046 if (old_active == new_active) 1047 return; 1048 1049 if (new_active) { 1050 new_active->jiffies = jiffies; 1051 1052 if (new_active->link == BOND_LINK_BACK) { 1053 if (USES_PRIMARY(bond->params.mode)) { 1054 pr_info("%s: making interface %s the new active one %d ms earlier.\n", 1055 bond->dev->name, new_active->dev->name, 1056 (bond->params.updelay - new_active->delay) * bond->params.miimon); 1057 } 1058 1059 new_active->delay = 0; 1060 new_active->link = BOND_LINK_UP; 1061 1062 if (bond->params.mode == BOND_MODE_8023AD) 1063 bond_3ad_handle_link_change(new_active, BOND_LINK_UP); 1064 1065 if (bond_is_lb(bond)) 1066 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); 1067 } else { 1068 if (USES_PRIMARY(bond->params.mode)) { 1069 pr_info("%s: making interface %s the new active one.\n", 1070 bond->dev->name, new_active->dev->name); 1071 } 1072 } 1073 } 1074 1075 if (USES_PRIMARY(bond->params.mode)) 1076 bond_mc_swap(bond, new_active, old_active); 1077 1078 if (bond_is_lb(bond)) { 1079 bond_alb_handle_active_change(bond, new_active); 1080 if (old_active) 1081 bond_set_slave_inactive_flags(old_active); 1082 if (new_active) 1083 bond_set_slave_active_flags(new_active); 1084 } else { 1085 bond->curr_active_slave = new_active; 1086 } 1087 1088 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) { 1089 if (old_active) 1090 bond_set_slave_inactive_flags(old_active); 1091 1092 if (new_active) { 1093 bool should_notify_peers = false; 1094 1095 bond_set_slave_active_flags(new_active); 1096 1097 if (bond->params.fail_over_mac) 1098 bond_do_fail_over_mac(bond, new_active, 1099 old_active); 1100 1101 if (netif_running(bond->dev)) { 1102 bond->send_peer_notif = 1103 bond->params.num_peer_notif; 1104 should_notify_peers = 1105 bond_should_notify_peers(bond); 1106 } 1107 1108 write_unlock_bh(&bond->curr_slave_lock); 1109 read_unlock(&bond->lock); 1110 1111 netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER); 1112 if (should_notify_peers) 1113 netdev_bonding_change(bond->dev, 1114 NETDEV_NOTIFY_PEERS); 1115 1116 read_lock(&bond->lock); 1117 write_lock_bh(&bond->curr_slave_lock); 1118 } 1119 } 1120 1121 /* resend IGMP joins since active slave has changed or 1122 * all were sent on curr_active_slave. 1123 * resend only if bond is brought up with the affected 1124 * bonding modes and the retransmission is enabled */ 1125 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && 1126 ((USES_PRIMARY(bond->params.mode) && new_active) || 1127 bond->params.mode == BOND_MODE_ROUNDROBIN)) { 1128 bond->igmp_retrans = bond->params.resend_igmp; 1129 queue_delayed_work(bond->wq, &bond->mcast_work, 0); 1130 } 1131 } 1132 1133 /** 1134 * bond_select_active_slave - select a new active slave, if needed 1135 * @bond: our bonding struct 1136 * 1137 * This functions should be called when one of the following occurs: 1138 * - The old curr_active_slave has been released or lost its link. 1139 * - The primary_slave has got its link back. 1140 * - A slave has got its link back and there's no old curr_active_slave. 1141 * 1142 * Caller must hold bond->lock for read and curr_slave_lock for write_bh. 1143 */ 1144 void bond_select_active_slave(struct bonding *bond) 1145 { 1146 struct slave *best_slave; 1147 int rv; 1148 1149 best_slave = bond_find_best_slave(bond); 1150 if (best_slave != bond->curr_active_slave) { 1151 bond_change_active_slave(bond, best_slave); 1152 rv = bond_set_carrier(bond); 1153 if (!rv) 1154 return; 1155 1156 if (netif_carrier_ok(bond->dev)) { 1157 pr_info("%s: first active interface up!\n", 1158 bond->dev->name); 1159 } else { 1160 pr_info("%s: now running without any active interface !\n", 1161 bond->dev->name); 1162 } 1163 } 1164 } 1165 1166 /*--------------------------- slave list handling ---------------------------*/ 1167 1168 /* 1169 * This function attaches the slave to the end of list. 1170 * 1171 * bond->lock held for writing by caller. 1172 */ 1173 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave) 1174 { 1175 if (bond->first_slave == NULL) { /* attaching the first slave */ 1176 new_slave->next = new_slave; 1177 new_slave->prev = new_slave; 1178 bond->first_slave = new_slave; 1179 } else { 1180 new_slave->next = bond->first_slave; 1181 new_slave->prev = bond->first_slave->prev; 1182 new_slave->next->prev = new_slave; 1183 new_slave->prev->next = new_slave; 1184 } 1185 1186 bond->slave_cnt++; 1187 } 1188 1189 /* 1190 * This function detaches the slave from the list. 1191 * WARNING: no check is made to verify if the slave effectively 1192 * belongs to <bond>. 1193 * Nothing is freed on return, structures are just unchained. 1194 * If any slave pointer in bond was pointing to <slave>, 1195 * it should be changed by the calling function. 1196 * 1197 * bond->lock held for writing by caller. 1198 */ 1199 static void bond_detach_slave(struct bonding *bond, struct slave *slave) 1200 { 1201 if (slave->next) 1202 slave->next->prev = slave->prev; 1203 1204 if (slave->prev) 1205 slave->prev->next = slave->next; 1206 1207 if (bond->first_slave == slave) { /* slave is the first slave */ 1208 if (bond->slave_cnt > 1) { /* there are more slave */ 1209 bond->first_slave = slave->next; 1210 } else { 1211 bond->first_slave = NULL; /* slave was the last one */ 1212 } 1213 } 1214 1215 slave->next = NULL; 1216 slave->prev = NULL; 1217 bond->slave_cnt--; 1218 } 1219 1220 #ifdef CONFIG_NET_POLL_CONTROLLER 1221 static inline int slave_enable_netpoll(struct slave *slave) 1222 { 1223 struct netpoll *np; 1224 int err = 0; 1225 1226 np = kzalloc(sizeof(*np), GFP_KERNEL); 1227 err = -ENOMEM; 1228 if (!np) 1229 goto out; 1230 1231 np->dev = slave->dev; 1232 strlcpy(np->dev_name, slave->dev->name, IFNAMSIZ); 1233 err = __netpoll_setup(np); 1234 if (err) { 1235 kfree(np); 1236 goto out; 1237 } 1238 slave->np = np; 1239 out: 1240 return err; 1241 } 1242 static inline void slave_disable_netpoll(struct slave *slave) 1243 { 1244 struct netpoll *np = slave->np; 1245 1246 if (!np) 1247 return; 1248 1249 slave->np = NULL; 1250 synchronize_rcu_bh(); 1251 __netpoll_cleanup(np); 1252 kfree(np); 1253 } 1254 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev) 1255 { 1256 if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL) 1257 return false; 1258 if (!slave_dev->netdev_ops->ndo_poll_controller) 1259 return false; 1260 return true; 1261 } 1262 1263 static void bond_poll_controller(struct net_device *bond_dev) 1264 { 1265 } 1266 1267 static void __bond_netpoll_cleanup(struct bonding *bond) 1268 { 1269 struct slave *slave; 1270 int i; 1271 1272 bond_for_each_slave(bond, slave, i) 1273 if (IS_UP(slave->dev)) 1274 slave_disable_netpoll(slave); 1275 } 1276 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1277 { 1278 struct bonding *bond = netdev_priv(bond_dev); 1279 1280 read_lock(&bond->lock); 1281 __bond_netpoll_cleanup(bond); 1282 read_unlock(&bond->lock); 1283 } 1284 1285 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) 1286 { 1287 struct bonding *bond = netdev_priv(dev); 1288 struct slave *slave; 1289 int i, err = 0; 1290 1291 read_lock(&bond->lock); 1292 bond_for_each_slave(bond, slave, i) { 1293 err = slave_enable_netpoll(slave); 1294 if (err) { 1295 __bond_netpoll_cleanup(bond); 1296 break; 1297 } 1298 } 1299 read_unlock(&bond->lock); 1300 return err; 1301 } 1302 1303 static struct netpoll_info *bond_netpoll_info(struct bonding *bond) 1304 { 1305 return bond->dev->npinfo; 1306 } 1307 1308 #else 1309 static inline int slave_enable_netpoll(struct slave *slave) 1310 { 1311 return 0; 1312 } 1313 static inline void slave_disable_netpoll(struct slave *slave) 1314 { 1315 } 1316 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1317 { 1318 } 1319 #endif 1320 1321 /*---------------------------------- IOCTL ----------------------------------*/ 1322 1323 static int bond_sethwaddr(struct net_device *bond_dev, 1324 struct net_device *slave_dev) 1325 { 1326 pr_debug("bond_dev=%p\n", bond_dev); 1327 pr_debug("slave_dev=%p\n", slave_dev); 1328 pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len); 1329 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len); 1330 return 0; 1331 } 1332 1333 static u32 bond_fix_features(struct net_device *dev, u32 features) 1334 { 1335 struct slave *slave; 1336 struct bonding *bond = netdev_priv(dev); 1337 u32 mask; 1338 int i; 1339 1340 read_lock(&bond->lock); 1341 1342 if (!bond->first_slave) { 1343 /* Disable adding VLANs to empty bond. But why? --mq */ 1344 features |= NETIF_F_VLAN_CHALLENGED; 1345 goto out; 1346 } 1347 1348 mask = features; 1349 features &= ~NETIF_F_ONE_FOR_ALL; 1350 features |= NETIF_F_ALL_FOR_ALL; 1351 1352 bond_for_each_slave(bond, slave, i) { 1353 features = netdev_increment_features(features, 1354 slave->dev->features, 1355 mask); 1356 } 1357 1358 out: 1359 read_unlock(&bond->lock); 1360 return features; 1361 } 1362 1363 #define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \ 1364 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \ 1365 NETIF_F_HIGHDMA | NETIF_F_LRO) 1366 1367 static void bond_compute_features(struct bonding *bond) 1368 { 1369 struct slave *slave; 1370 struct net_device *bond_dev = bond->dev; 1371 u32 vlan_features = BOND_VLAN_FEATURES; 1372 unsigned short max_hard_header_len = ETH_HLEN; 1373 int i; 1374 1375 read_lock(&bond->lock); 1376 1377 if (!bond->first_slave) 1378 goto done; 1379 1380 bond_for_each_slave(bond, slave, i) { 1381 vlan_features = netdev_increment_features(vlan_features, 1382 slave->dev->vlan_features, BOND_VLAN_FEATURES); 1383 1384 if (slave->dev->hard_header_len > max_hard_header_len) 1385 max_hard_header_len = slave->dev->hard_header_len; 1386 } 1387 1388 done: 1389 bond_dev->vlan_features = vlan_features; 1390 bond_dev->hard_header_len = max_hard_header_len; 1391 1392 read_unlock(&bond->lock); 1393 1394 netdev_change_features(bond_dev); 1395 } 1396 1397 static void bond_setup_by_slave(struct net_device *bond_dev, 1398 struct net_device *slave_dev) 1399 { 1400 struct bonding *bond = netdev_priv(bond_dev); 1401 1402 bond_dev->header_ops = slave_dev->header_ops; 1403 1404 bond_dev->type = slave_dev->type; 1405 bond_dev->hard_header_len = slave_dev->hard_header_len; 1406 bond_dev->addr_len = slave_dev->addr_len; 1407 1408 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1409 slave_dev->addr_len); 1410 bond->setup_by_slave = 1; 1411 } 1412 1413 /* On bonding slaves other than the currently active slave, suppress 1414 * duplicates except for alb non-mcast/bcast. 1415 */ 1416 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1417 struct slave *slave, 1418 struct bonding *bond) 1419 { 1420 if (bond_is_slave_inactive(slave)) { 1421 if (bond->params.mode == BOND_MODE_ALB && 1422 skb->pkt_type != PACKET_BROADCAST && 1423 skb->pkt_type != PACKET_MULTICAST) 1424 return false; 1425 return true; 1426 } 1427 return false; 1428 } 1429 1430 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1431 { 1432 struct sk_buff *skb = *pskb; 1433 struct slave *slave; 1434 struct bonding *bond; 1435 1436 skb = skb_share_check(skb, GFP_ATOMIC); 1437 if (unlikely(!skb)) 1438 return RX_HANDLER_CONSUMED; 1439 1440 *pskb = skb; 1441 1442 slave = bond_slave_get_rcu(skb->dev); 1443 bond = slave->bond; 1444 1445 if (bond->params.arp_interval) 1446 slave->dev->last_rx = jiffies; 1447 1448 if (bond->recv_probe) { 1449 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); 1450 1451 if (likely(nskb)) { 1452 bond->recv_probe(nskb, bond, slave); 1453 dev_kfree_skb(nskb); 1454 } 1455 } 1456 1457 if (bond_should_deliver_exact_match(skb, slave, bond)) { 1458 return RX_HANDLER_EXACT; 1459 } 1460 1461 skb->dev = bond->dev; 1462 1463 if (bond->params.mode == BOND_MODE_ALB && 1464 bond->dev->priv_flags & IFF_BRIDGE_PORT && 1465 skb->pkt_type == PACKET_HOST) { 1466 1467 if (unlikely(skb_cow_head(skb, 1468 skb->data - skb_mac_header(skb)))) { 1469 kfree_skb(skb); 1470 return RX_HANDLER_CONSUMED; 1471 } 1472 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN); 1473 } 1474 1475 return RX_HANDLER_ANOTHER; 1476 } 1477 1478 /* enslave device <slave> to bond device <master> */ 1479 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev) 1480 { 1481 struct bonding *bond = netdev_priv(bond_dev); 1482 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1483 struct slave *new_slave = NULL; 1484 struct netdev_hw_addr *ha; 1485 struct sockaddr addr; 1486 int link_reporting; 1487 int res = 0; 1488 1489 if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL && 1490 slave_ops->ndo_do_ioctl == NULL) { 1491 pr_warning("%s: Warning: no link monitoring support for %s\n", 1492 bond_dev->name, slave_dev->name); 1493 } 1494 1495 /* already enslaved */ 1496 if (slave_dev->flags & IFF_SLAVE) { 1497 pr_debug("Error, Device was already enslaved\n"); 1498 return -EBUSY; 1499 } 1500 1501 /* vlan challenged mutual exclusion */ 1502 /* no need to lock since we're protected by rtnl_lock */ 1503 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1504 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name); 1505 if (bond_vlan_used(bond)) { 1506 pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n", 1507 bond_dev->name, slave_dev->name, bond_dev->name); 1508 return -EPERM; 1509 } else { 1510 pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n", 1511 bond_dev->name, slave_dev->name, 1512 slave_dev->name, bond_dev->name); 1513 } 1514 } else { 1515 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name); 1516 } 1517 1518 /* 1519 * Old ifenslave binaries are no longer supported. These can 1520 * be identified with moderate accuracy by the state of the slave: 1521 * the current ifenslave will set the interface down prior to 1522 * enslaving it; the old ifenslave will not. 1523 */ 1524 if ((slave_dev->flags & IFF_UP)) { 1525 pr_err("%s is up. This may be due to an out of date ifenslave.\n", 1526 slave_dev->name); 1527 res = -EPERM; 1528 goto err_undo_flags; 1529 } 1530 1531 /* set bonding device ether type by slave - bonding netdevices are 1532 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1533 * there is a need to override some of the type dependent attribs/funcs. 1534 * 1535 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1536 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1537 */ 1538 if (bond->slave_cnt == 0) { 1539 if (bond_dev->type != slave_dev->type) { 1540 pr_debug("%s: change device type from %d to %d\n", 1541 bond_dev->name, 1542 bond_dev->type, slave_dev->type); 1543 1544 res = netdev_bonding_change(bond_dev, 1545 NETDEV_PRE_TYPE_CHANGE); 1546 res = notifier_to_errno(res); 1547 if (res) { 1548 pr_err("%s: refused to change device type\n", 1549 bond_dev->name); 1550 res = -EBUSY; 1551 goto err_undo_flags; 1552 } 1553 1554 /* Flush unicast and multicast addresses */ 1555 dev_uc_flush(bond_dev); 1556 dev_mc_flush(bond_dev); 1557 1558 if (slave_dev->type != ARPHRD_ETHER) 1559 bond_setup_by_slave(bond_dev, slave_dev); 1560 else { 1561 ether_setup(bond_dev); 1562 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1563 } 1564 1565 netdev_bonding_change(bond_dev, 1566 NETDEV_POST_TYPE_CHANGE); 1567 } 1568 } else if (bond_dev->type != slave_dev->type) { 1569 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n", 1570 slave_dev->name, 1571 slave_dev->type, bond_dev->type); 1572 res = -EINVAL; 1573 goto err_undo_flags; 1574 } 1575 1576 if (slave_ops->ndo_set_mac_address == NULL) { 1577 if (bond->slave_cnt == 0) { 1578 pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.", 1579 bond_dev->name); 1580 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1581 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1582 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", 1583 bond_dev->name); 1584 res = -EOPNOTSUPP; 1585 goto err_undo_flags; 1586 } 1587 } 1588 1589 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1590 1591 /* If this is the first slave, then we need to set the master's hardware 1592 * address to be the same as the slave's. */ 1593 if (is_zero_ether_addr(bond->dev->dev_addr)) 1594 memcpy(bond->dev->dev_addr, slave_dev->dev_addr, 1595 slave_dev->addr_len); 1596 1597 1598 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL); 1599 if (!new_slave) { 1600 res = -ENOMEM; 1601 goto err_undo_flags; 1602 } 1603 1604 /* 1605 * Set the new_slave's queue_id to be zero. Queue ID mapping 1606 * is set via sysfs or module option if desired. 1607 */ 1608 new_slave->queue_id = 0; 1609 1610 /* Save slave's original mtu and then set it to match the bond */ 1611 new_slave->original_mtu = slave_dev->mtu; 1612 res = dev_set_mtu(slave_dev, bond->dev->mtu); 1613 if (res) { 1614 pr_debug("Error %d calling dev_set_mtu\n", res); 1615 goto err_free; 1616 } 1617 1618 /* 1619 * Save slave's original ("permanent") mac address for modes 1620 * that need it, and for restoring it upon release, and then 1621 * set it to the master's address 1622 */ 1623 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN); 1624 1625 if (!bond->params.fail_over_mac) { 1626 /* 1627 * Set slave to master's mac address. The application already 1628 * set the master's mac address to that of the first slave 1629 */ 1630 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 1631 addr.sa_family = slave_dev->type; 1632 res = dev_set_mac_address(slave_dev, &addr); 1633 if (res) { 1634 pr_debug("Error %d calling set_mac_address\n", res); 1635 goto err_restore_mtu; 1636 } 1637 } 1638 1639 res = netdev_set_bond_master(slave_dev, bond_dev); 1640 if (res) { 1641 pr_debug("Error %d calling netdev_set_bond_master\n", res); 1642 goto err_restore_mac; 1643 } 1644 1645 /* open the slave since the application closed it */ 1646 res = dev_open(slave_dev); 1647 if (res) { 1648 pr_debug("Opening slave %s failed\n", slave_dev->name); 1649 goto err_unset_master; 1650 } 1651 1652 new_slave->bond = bond; 1653 new_slave->dev = slave_dev; 1654 slave_dev->priv_flags |= IFF_BONDING; 1655 1656 if (bond_is_lb(bond)) { 1657 /* bond_alb_init_slave() must be called before all other stages since 1658 * it might fail and we do not want to have to undo everything 1659 */ 1660 res = bond_alb_init_slave(bond, new_slave); 1661 if (res) 1662 goto err_close; 1663 } 1664 1665 /* If the mode USES_PRIMARY, then the new slave gets the 1666 * master's promisc (and mc) settings only if it becomes the 1667 * curr_active_slave, and that is taken care of later when calling 1668 * bond_change_active() 1669 */ 1670 if (!USES_PRIMARY(bond->params.mode)) { 1671 /* set promiscuity level to new slave */ 1672 if (bond_dev->flags & IFF_PROMISC) { 1673 res = dev_set_promiscuity(slave_dev, 1); 1674 if (res) 1675 goto err_close; 1676 } 1677 1678 /* set allmulti level to new slave */ 1679 if (bond_dev->flags & IFF_ALLMULTI) { 1680 res = dev_set_allmulti(slave_dev, 1); 1681 if (res) 1682 goto err_close; 1683 } 1684 1685 netif_addr_lock_bh(bond_dev); 1686 /* upload master's mc_list to new slave */ 1687 netdev_for_each_mc_addr(ha, bond_dev) 1688 dev_mc_add(slave_dev, ha->addr); 1689 netif_addr_unlock_bh(bond_dev); 1690 } 1691 1692 if (bond->params.mode == BOND_MODE_8023AD) { 1693 /* add lacpdu mc addr to mc list */ 1694 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 1695 1696 dev_mc_add(slave_dev, lacpdu_multicast); 1697 } 1698 1699 bond_add_vlans_on_slave(bond, slave_dev); 1700 1701 write_lock_bh(&bond->lock); 1702 1703 bond_attach_slave(bond, new_slave); 1704 1705 new_slave->delay = 0; 1706 new_slave->link_failure_count = 0; 1707 1708 write_unlock_bh(&bond->lock); 1709 1710 bond_compute_features(bond); 1711 1712 read_lock(&bond->lock); 1713 1714 new_slave->last_arp_rx = jiffies; 1715 1716 if (bond->params.miimon && !bond->params.use_carrier) { 1717 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 1718 1719 if ((link_reporting == -1) && !bond->params.arp_interval) { 1720 /* 1721 * miimon is set but a bonded network driver 1722 * does not support ETHTOOL/MII and 1723 * arp_interval is not set. Note: if 1724 * use_carrier is enabled, we will never go 1725 * here (because netif_carrier is always 1726 * supported); thus, we don't need to change 1727 * the messages for netif_carrier. 1728 */ 1729 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", 1730 bond_dev->name, slave_dev->name); 1731 } else if (link_reporting == -1) { 1732 /* unable get link status using mii/ethtool */ 1733 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", 1734 bond_dev->name, slave_dev->name); 1735 } 1736 } 1737 1738 /* check for initial state */ 1739 if (!bond->params.miimon || 1740 (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) { 1741 if (bond->params.updelay) { 1742 pr_debug("Initial state of slave_dev is BOND_LINK_BACK\n"); 1743 new_slave->link = BOND_LINK_BACK; 1744 new_slave->delay = bond->params.updelay; 1745 } else { 1746 pr_debug("Initial state of slave_dev is BOND_LINK_UP\n"); 1747 new_slave->link = BOND_LINK_UP; 1748 } 1749 new_slave->jiffies = jiffies; 1750 } else { 1751 pr_debug("Initial state of slave_dev is BOND_LINK_DOWN\n"); 1752 new_slave->link = BOND_LINK_DOWN; 1753 } 1754 1755 if (bond_update_speed_duplex(new_slave) && 1756 (new_slave->link != BOND_LINK_DOWN)) { 1757 pr_warning("%s: Warning: failed to get speed and duplex from %s, assumed to be 100Mb/sec and Full.\n", 1758 bond_dev->name, new_slave->dev->name); 1759 1760 if (bond->params.mode == BOND_MODE_8023AD) { 1761 pr_warning("%s: Warning: Operation of 802.3ad mode requires ETHTOOL support in base driver for proper aggregator selection.\n", 1762 bond_dev->name); 1763 } 1764 } 1765 1766 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) { 1767 /* if there is a primary slave, remember it */ 1768 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 1769 bond->primary_slave = new_slave; 1770 bond->force_primary = true; 1771 } 1772 } 1773 1774 write_lock_bh(&bond->curr_slave_lock); 1775 1776 switch (bond->params.mode) { 1777 case BOND_MODE_ACTIVEBACKUP: 1778 bond_set_slave_inactive_flags(new_slave); 1779 bond_select_active_slave(bond); 1780 break; 1781 case BOND_MODE_8023AD: 1782 /* in 802.3ad mode, the internal mechanism 1783 * will activate the slaves in the selected 1784 * aggregator 1785 */ 1786 bond_set_slave_inactive_flags(new_slave); 1787 /* if this is the first slave */ 1788 if (bond->slave_cnt == 1) { 1789 SLAVE_AD_INFO(new_slave).id = 1; 1790 /* Initialize AD with the number of times that the AD timer is called in 1 second 1791 * can be called only after the mac address of the bond is set 1792 */ 1793 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL); 1794 } else { 1795 SLAVE_AD_INFO(new_slave).id = 1796 SLAVE_AD_INFO(new_slave->prev).id + 1; 1797 } 1798 1799 bond_3ad_bind_slave(new_slave); 1800 break; 1801 case BOND_MODE_TLB: 1802 case BOND_MODE_ALB: 1803 bond_set_active_slave(new_slave); 1804 bond_set_slave_inactive_flags(new_slave); 1805 bond_select_active_slave(bond); 1806 break; 1807 default: 1808 pr_debug("This slave is always active in trunk mode\n"); 1809 1810 /* always active in trunk mode */ 1811 bond_set_active_slave(new_slave); 1812 1813 /* In trunking mode there is little meaning to curr_active_slave 1814 * anyway (it holds no special properties of the bond device), 1815 * so we can change it without calling change_active_interface() 1816 */ 1817 if (!bond->curr_active_slave) 1818 bond->curr_active_slave = new_slave; 1819 1820 break; 1821 } /* switch(bond_mode) */ 1822 1823 write_unlock_bh(&bond->curr_slave_lock); 1824 1825 bond_set_carrier(bond); 1826 1827 #ifdef CONFIG_NET_POLL_CONTROLLER 1828 slave_dev->npinfo = bond_netpoll_info(bond); 1829 if (slave_dev->npinfo) { 1830 if (slave_enable_netpoll(new_slave)) { 1831 read_unlock(&bond->lock); 1832 pr_info("Error, %s: master_dev is using netpoll, " 1833 "but new slave device does not support netpoll.\n", 1834 bond_dev->name); 1835 res = -EBUSY; 1836 goto err_close; 1837 } 1838 } 1839 #endif 1840 1841 read_unlock(&bond->lock); 1842 1843 res = bond_create_slave_symlinks(bond_dev, slave_dev); 1844 if (res) 1845 goto err_close; 1846 1847 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 1848 new_slave); 1849 if (res) { 1850 pr_debug("Error %d calling netdev_rx_handler_register\n", res); 1851 goto err_dest_symlinks; 1852 } 1853 1854 pr_info("%s: enslaving %s as a%s interface with a%s link.\n", 1855 bond_dev->name, slave_dev->name, 1856 bond_is_active_slave(new_slave) ? "n active" : " backup", 1857 new_slave->link != BOND_LINK_DOWN ? "n up" : " down"); 1858 1859 /* enslave is successful */ 1860 return 0; 1861 1862 /* Undo stages on error */ 1863 err_dest_symlinks: 1864 bond_destroy_slave_symlinks(bond_dev, slave_dev); 1865 1866 err_close: 1867 dev_close(slave_dev); 1868 1869 err_unset_master: 1870 netdev_set_bond_master(slave_dev, NULL); 1871 1872 err_restore_mac: 1873 if (!bond->params.fail_over_mac) { 1874 /* XXX TODO - fom follow mode needs to change master's 1875 * MAC if this slave's MAC is in use by the bond, or at 1876 * least print a warning. 1877 */ 1878 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN); 1879 addr.sa_family = slave_dev->type; 1880 dev_set_mac_address(slave_dev, &addr); 1881 } 1882 1883 err_restore_mtu: 1884 dev_set_mtu(slave_dev, new_slave->original_mtu); 1885 1886 err_free: 1887 kfree(new_slave); 1888 1889 err_undo_flags: 1890 bond_compute_features(bond); 1891 1892 return res; 1893 } 1894 1895 /* 1896 * Try to release the slave device <slave> from the bond device <master> 1897 * It is legal to access curr_active_slave without a lock because all the function 1898 * is write-locked. 1899 * 1900 * The rules for slave state should be: 1901 * for Active/Backup: 1902 * Active stays on all backups go down 1903 * for Bonded connections: 1904 * The first up interface should be left on and all others downed. 1905 */ 1906 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 1907 { 1908 struct bonding *bond = netdev_priv(bond_dev); 1909 struct slave *slave, *oldcurrent; 1910 struct sockaddr addr; 1911 u32 old_features = bond_dev->features; 1912 1913 /* slave is not a slave or master is not master of this slave */ 1914 if (!(slave_dev->flags & IFF_SLAVE) || 1915 (slave_dev->master != bond_dev)) { 1916 pr_err("%s: Error: cannot release %s.\n", 1917 bond_dev->name, slave_dev->name); 1918 return -EINVAL; 1919 } 1920 1921 block_netpoll_tx(); 1922 netdev_bonding_change(bond_dev, NETDEV_RELEASE); 1923 write_lock_bh(&bond->lock); 1924 1925 slave = bond_get_slave_by_dev(bond, slave_dev); 1926 if (!slave) { 1927 /* not a slave of this bond */ 1928 pr_info("%s: %s not enslaved\n", 1929 bond_dev->name, slave_dev->name); 1930 write_unlock_bh(&bond->lock); 1931 unblock_netpoll_tx(); 1932 return -EINVAL; 1933 } 1934 1935 /* unregister rx_handler early so bond_handle_frame wouldn't be called 1936 * for this slave anymore. 1937 */ 1938 netdev_rx_handler_unregister(slave_dev); 1939 write_unlock_bh(&bond->lock); 1940 synchronize_net(); 1941 write_lock_bh(&bond->lock); 1942 1943 if (!bond->params.fail_over_mac) { 1944 if (!compare_ether_addr(bond_dev->dev_addr, slave->perm_hwaddr) && 1945 bond->slave_cnt > 1) 1946 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", 1947 bond_dev->name, slave_dev->name, 1948 slave->perm_hwaddr, 1949 bond_dev->name, slave_dev->name); 1950 } 1951 1952 /* Inform AD package of unbinding of slave. */ 1953 if (bond->params.mode == BOND_MODE_8023AD) { 1954 /* must be called before the slave is 1955 * detached from the list 1956 */ 1957 bond_3ad_unbind_slave(slave); 1958 } 1959 1960 pr_info("%s: releasing %s interface %s\n", 1961 bond_dev->name, 1962 bond_is_active_slave(slave) ? "active" : "backup", 1963 slave_dev->name); 1964 1965 oldcurrent = bond->curr_active_slave; 1966 1967 bond->current_arp_slave = NULL; 1968 1969 /* release the slave from its bond */ 1970 bond_detach_slave(bond, slave); 1971 1972 if (bond->primary_slave == slave) 1973 bond->primary_slave = NULL; 1974 1975 if (oldcurrent == slave) 1976 bond_change_active_slave(bond, NULL); 1977 1978 if (bond_is_lb(bond)) { 1979 /* Must be called only after the slave has been 1980 * detached from the list and the curr_active_slave 1981 * has been cleared (if our_slave == old_current), 1982 * but before a new active slave is selected. 1983 */ 1984 write_unlock_bh(&bond->lock); 1985 bond_alb_deinit_slave(bond, slave); 1986 write_lock_bh(&bond->lock); 1987 } 1988 1989 if (oldcurrent == slave) { 1990 /* 1991 * Note that we hold RTNL over this sequence, so there 1992 * is no concern that another slave add/remove event 1993 * will interfere. 1994 */ 1995 write_unlock_bh(&bond->lock); 1996 read_lock(&bond->lock); 1997 write_lock_bh(&bond->curr_slave_lock); 1998 1999 bond_select_active_slave(bond); 2000 2001 write_unlock_bh(&bond->curr_slave_lock); 2002 read_unlock(&bond->lock); 2003 write_lock_bh(&bond->lock); 2004 } 2005 2006 if (bond->slave_cnt == 0) { 2007 bond_set_carrier(bond); 2008 2009 /* if the last slave was removed, zero the mac address 2010 * of the master so it will be set by the application 2011 * to the mac address of the first slave 2012 */ 2013 memset(bond_dev->dev_addr, 0, bond_dev->addr_len); 2014 2015 if (bond_vlan_used(bond)) { 2016 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n", 2017 bond_dev->name, bond_dev->name); 2018 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n", 2019 bond_dev->name); 2020 } 2021 } 2022 2023 write_unlock_bh(&bond->lock); 2024 unblock_netpoll_tx(); 2025 2026 bond_compute_features(bond); 2027 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 2028 (old_features & NETIF_F_VLAN_CHALLENGED)) 2029 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n", 2030 bond_dev->name, slave_dev->name, bond_dev->name); 2031 2032 /* must do this from outside any spinlocks */ 2033 bond_destroy_slave_symlinks(bond_dev, slave_dev); 2034 2035 bond_del_vlans_from_slave(bond, slave_dev); 2036 2037 /* If the mode USES_PRIMARY, then we should only remove its 2038 * promisc and mc settings if it was the curr_active_slave, but that was 2039 * already taken care of above when we detached the slave 2040 */ 2041 if (!USES_PRIMARY(bond->params.mode)) { 2042 /* unset promiscuity level from slave */ 2043 if (bond_dev->flags & IFF_PROMISC) 2044 dev_set_promiscuity(slave_dev, -1); 2045 2046 /* unset allmulti level from slave */ 2047 if (bond_dev->flags & IFF_ALLMULTI) 2048 dev_set_allmulti(slave_dev, -1); 2049 2050 /* flush master's mc_list from slave */ 2051 netif_addr_lock_bh(bond_dev); 2052 bond_mc_list_flush(bond_dev, slave_dev); 2053 netif_addr_unlock_bh(bond_dev); 2054 } 2055 2056 netdev_set_bond_master(slave_dev, NULL); 2057 2058 slave_disable_netpoll(slave); 2059 2060 /* close slave before restoring its mac address */ 2061 dev_close(slave_dev); 2062 2063 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 2064 /* restore original ("permanent") mac address */ 2065 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN); 2066 addr.sa_family = slave_dev->type; 2067 dev_set_mac_address(slave_dev, &addr); 2068 } 2069 2070 dev_set_mtu(slave_dev, slave->original_mtu); 2071 2072 slave_dev->priv_flags &= ~IFF_BONDING; 2073 2074 kfree(slave); 2075 2076 return 0; /* deletion OK */ 2077 } 2078 2079 /* 2080 * First release a slave and then destroy the bond if no more slaves are left. 2081 * Must be under rtnl_lock when this function is called. 2082 */ 2083 static int bond_release_and_destroy(struct net_device *bond_dev, 2084 struct net_device *slave_dev) 2085 { 2086 struct bonding *bond = netdev_priv(bond_dev); 2087 int ret; 2088 2089 ret = bond_release(bond_dev, slave_dev); 2090 if ((ret == 0) && (bond->slave_cnt == 0)) { 2091 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 2092 pr_info("%s: destroying bond %s.\n", 2093 bond_dev->name, bond_dev->name); 2094 unregister_netdevice(bond_dev); 2095 } 2096 return ret; 2097 } 2098 2099 /* 2100 * This function releases all slaves. 2101 */ 2102 static int bond_release_all(struct net_device *bond_dev) 2103 { 2104 struct bonding *bond = netdev_priv(bond_dev); 2105 struct slave *slave; 2106 struct net_device *slave_dev; 2107 struct sockaddr addr; 2108 2109 write_lock_bh(&bond->lock); 2110 2111 netif_carrier_off(bond_dev); 2112 2113 if (bond->slave_cnt == 0) 2114 goto out; 2115 2116 bond->current_arp_slave = NULL; 2117 bond->primary_slave = NULL; 2118 bond_change_active_slave(bond, NULL); 2119 2120 while ((slave = bond->first_slave) != NULL) { 2121 /* Inform AD package of unbinding of slave 2122 * before slave is detached from the list. 2123 */ 2124 if (bond->params.mode == BOND_MODE_8023AD) 2125 bond_3ad_unbind_slave(slave); 2126 2127 slave_dev = slave->dev; 2128 bond_detach_slave(bond, slave); 2129 2130 /* now that the slave is detached, unlock and perform 2131 * all the undo steps that should not be called from 2132 * within a lock. 2133 */ 2134 write_unlock_bh(&bond->lock); 2135 2136 /* unregister rx_handler early so bond_handle_frame wouldn't 2137 * be called for this slave anymore. 2138 */ 2139 netdev_rx_handler_unregister(slave_dev); 2140 synchronize_net(); 2141 2142 if (bond_is_lb(bond)) { 2143 /* must be called only after the slave 2144 * has been detached from the list 2145 */ 2146 bond_alb_deinit_slave(bond, slave); 2147 } 2148 2149 bond_destroy_slave_symlinks(bond_dev, slave_dev); 2150 bond_del_vlans_from_slave(bond, slave_dev); 2151 2152 /* If the mode USES_PRIMARY, then we should only remove its 2153 * promisc and mc settings if it was the curr_active_slave, but that was 2154 * already taken care of above when we detached the slave 2155 */ 2156 if (!USES_PRIMARY(bond->params.mode)) { 2157 /* unset promiscuity level from slave */ 2158 if (bond_dev->flags & IFF_PROMISC) 2159 dev_set_promiscuity(slave_dev, -1); 2160 2161 /* unset allmulti level from slave */ 2162 if (bond_dev->flags & IFF_ALLMULTI) 2163 dev_set_allmulti(slave_dev, -1); 2164 2165 /* flush master's mc_list from slave */ 2166 netif_addr_lock_bh(bond_dev); 2167 bond_mc_list_flush(bond_dev, slave_dev); 2168 netif_addr_unlock_bh(bond_dev); 2169 } 2170 2171 netdev_set_bond_master(slave_dev, NULL); 2172 2173 slave_disable_netpoll(slave); 2174 2175 /* close slave before restoring its mac address */ 2176 dev_close(slave_dev); 2177 2178 if (!bond->params.fail_over_mac) { 2179 /* restore original ("permanent") mac address*/ 2180 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN); 2181 addr.sa_family = slave_dev->type; 2182 dev_set_mac_address(slave_dev, &addr); 2183 } 2184 2185 kfree(slave); 2186 2187 /* re-acquire the lock before getting the next slave */ 2188 write_lock_bh(&bond->lock); 2189 } 2190 2191 /* zero the mac address of the master so it will be 2192 * set by the application to the mac address of the 2193 * first slave 2194 */ 2195 memset(bond_dev->dev_addr, 0, bond_dev->addr_len); 2196 2197 if (bond_vlan_used(bond)) { 2198 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n", 2199 bond_dev->name, bond_dev->name); 2200 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n", 2201 bond_dev->name); 2202 } 2203 2204 pr_info("%s: released all slaves\n", bond_dev->name); 2205 2206 out: 2207 write_unlock_bh(&bond->lock); 2208 2209 bond_compute_features(bond); 2210 2211 return 0; 2212 } 2213 2214 /* 2215 * This function changes the active slave to slave <slave_dev>. 2216 * It returns -EINVAL in the following cases. 2217 * - <slave_dev> is not found in the list. 2218 * - There is not active slave now. 2219 * - <slave_dev> is already active. 2220 * - The link state of <slave_dev> is not BOND_LINK_UP. 2221 * - <slave_dev> is not running. 2222 * In these cases, this function does nothing. 2223 * In the other cases, current_slave pointer is changed and 0 is returned. 2224 */ 2225 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev) 2226 { 2227 struct bonding *bond = netdev_priv(bond_dev); 2228 struct slave *old_active = NULL; 2229 struct slave *new_active = NULL; 2230 int res = 0; 2231 2232 if (!USES_PRIMARY(bond->params.mode)) 2233 return -EINVAL; 2234 2235 /* Verify that master_dev is indeed the master of slave_dev */ 2236 if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev)) 2237 return -EINVAL; 2238 2239 read_lock(&bond->lock); 2240 2241 read_lock(&bond->curr_slave_lock); 2242 old_active = bond->curr_active_slave; 2243 read_unlock(&bond->curr_slave_lock); 2244 2245 new_active = bond_get_slave_by_dev(bond, slave_dev); 2246 2247 /* 2248 * Changing to the current active: do nothing; return success. 2249 */ 2250 if (new_active && (new_active == old_active)) { 2251 read_unlock(&bond->lock); 2252 return 0; 2253 } 2254 2255 if ((new_active) && 2256 (old_active) && 2257 (new_active->link == BOND_LINK_UP) && 2258 IS_UP(new_active->dev)) { 2259 block_netpoll_tx(); 2260 write_lock_bh(&bond->curr_slave_lock); 2261 bond_change_active_slave(bond, new_active); 2262 write_unlock_bh(&bond->curr_slave_lock); 2263 unblock_netpoll_tx(); 2264 } else 2265 res = -EINVAL; 2266 2267 read_unlock(&bond->lock); 2268 2269 return res; 2270 } 2271 2272 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info) 2273 { 2274 struct bonding *bond = netdev_priv(bond_dev); 2275 2276 info->bond_mode = bond->params.mode; 2277 info->miimon = bond->params.miimon; 2278 2279 read_lock(&bond->lock); 2280 info->num_slaves = bond->slave_cnt; 2281 read_unlock(&bond->lock); 2282 2283 return 0; 2284 } 2285 2286 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 2287 { 2288 struct bonding *bond = netdev_priv(bond_dev); 2289 struct slave *slave; 2290 int i, res = -ENODEV; 2291 2292 read_lock(&bond->lock); 2293 2294 bond_for_each_slave(bond, slave, i) { 2295 if (i == (int)info->slave_id) { 2296 res = 0; 2297 strcpy(info->slave_name, slave->dev->name); 2298 info->link = slave->link; 2299 info->state = bond_slave_state(slave); 2300 info->link_failure_count = slave->link_failure_count; 2301 break; 2302 } 2303 } 2304 2305 read_unlock(&bond->lock); 2306 2307 return res; 2308 } 2309 2310 /*-------------------------------- Monitoring -------------------------------*/ 2311 2312 2313 static int bond_miimon_inspect(struct bonding *bond) 2314 { 2315 struct slave *slave; 2316 int i, link_state, commit = 0; 2317 bool ignore_updelay; 2318 2319 ignore_updelay = !bond->curr_active_slave ? true : false; 2320 2321 bond_for_each_slave(bond, slave, i) { 2322 slave->new_link = BOND_LINK_NOCHANGE; 2323 2324 link_state = bond_check_dev_link(bond, slave->dev, 0); 2325 2326 switch (slave->link) { 2327 case BOND_LINK_UP: 2328 if (link_state) 2329 continue; 2330 2331 slave->link = BOND_LINK_FAIL; 2332 slave->delay = bond->params.downdelay; 2333 if (slave->delay) { 2334 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n", 2335 bond->dev->name, 2336 (bond->params.mode == 2337 BOND_MODE_ACTIVEBACKUP) ? 2338 (bond_is_active_slave(slave) ? 2339 "active " : "backup ") : "", 2340 slave->dev->name, 2341 bond->params.downdelay * bond->params.miimon); 2342 } 2343 /*FALLTHRU*/ 2344 case BOND_LINK_FAIL: 2345 if (link_state) { 2346 /* 2347 * recovered before downdelay expired 2348 */ 2349 slave->link = BOND_LINK_UP; 2350 slave->jiffies = jiffies; 2351 pr_info("%s: link status up again after %d ms for interface %s.\n", 2352 bond->dev->name, 2353 (bond->params.downdelay - slave->delay) * 2354 bond->params.miimon, 2355 slave->dev->name); 2356 continue; 2357 } 2358 2359 if (slave->delay <= 0) { 2360 slave->new_link = BOND_LINK_DOWN; 2361 commit++; 2362 continue; 2363 } 2364 2365 slave->delay--; 2366 break; 2367 2368 case BOND_LINK_DOWN: 2369 if (!link_state) 2370 continue; 2371 2372 slave->link = BOND_LINK_BACK; 2373 slave->delay = bond->params.updelay; 2374 2375 if (slave->delay) { 2376 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n", 2377 bond->dev->name, slave->dev->name, 2378 ignore_updelay ? 0 : 2379 bond->params.updelay * 2380 bond->params.miimon); 2381 } 2382 /*FALLTHRU*/ 2383 case BOND_LINK_BACK: 2384 if (!link_state) { 2385 slave->link = BOND_LINK_DOWN; 2386 pr_info("%s: link status down again after %d ms for interface %s.\n", 2387 bond->dev->name, 2388 (bond->params.updelay - slave->delay) * 2389 bond->params.miimon, 2390 slave->dev->name); 2391 2392 continue; 2393 } 2394 2395 if (ignore_updelay) 2396 slave->delay = 0; 2397 2398 if (slave->delay <= 0) { 2399 slave->new_link = BOND_LINK_UP; 2400 commit++; 2401 ignore_updelay = false; 2402 continue; 2403 } 2404 2405 slave->delay--; 2406 break; 2407 } 2408 } 2409 2410 return commit; 2411 } 2412 2413 static void bond_miimon_commit(struct bonding *bond) 2414 { 2415 struct slave *slave; 2416 int i; 2417 2418 bond_for_each_slave(bond, slave, i) { 2419 switch (slave->new_link) { 2420 case BOND_LINK_NOCHANGE: 2421 continue; 2422 2423 case BOND_LINK_UP: 2424 slave->link = BOND_LINK_UP; 2425 slave->jiffies = jiffies; 2426 2427 if (bond->params.mode == BOND_MODE_8023AD) { 2428 /* prevent it from being the active one */ 2429 bond_set_backup_slave(slave); 2430 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) { 2431 /* make it immediately active */ 2432 bond_set_active_slave(slave); 2433 } else if (slave != bond->primary_slave) { 2434 /* prevent it from being the active one */ 2435 bond_set_backup_slave(slave); 2436 } 2437 2438 bond_update_speed_duplex(slave); 2439 2440 pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n", 2441 bond->dev->name, slave->dev->name, 2442 slave->speed, slave->duplex ? "full" : "half"); 2443 2444 /* notify ad that the link status has changed */ 2445 if (bond->params.mode == BOND_MODE_8023AD) 2446 bond_3ad_handle_link_change(slave, BOND_LINK_UP); 2447 2448 if (bond_is_lb(bond)) 2449 bond_alb_handle_link_change(bond, slave, 2450 BOND_LINK_UP); 2451 2452 if (!bond->curr_active_slave || 2453 (slave == bond->primary_slave)) 2454 goto do_failover; 2455 2456 continue; 2457 2458 case BOND_LINK_DOWN: 2459 if (slave->link_failure_count < UINT_MAX) 2460 slave->link_failure_count++; 2461 2462 slave->link = BOND_LINK_DOWN; 2463 2464 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP || 2465 bond->params.mode == BOND_MODE_8023AD) 2466 bond_set_slave_inactive_flags(slave); 2467 2468 pr_info("%s: link status definitely down for interface %s, disabling it\n", 2469 bond->dev->name, slave->dev->name); 2470 2471 if (bond->params.mode == BOND_MODE_8023AD) 2472 bond_3ad_handle_link_change(slave, 2473 BOND_LINK_DOWN); 2474 2475 if (bond_is_lb(bond)) 2476 bond_alb_handle_link_change(bond, slave, 2477 BOND_LINK_DOWN); 2478 2479 if (slave == bond->curr_active_slave) 2480 goto do_failover; 2481 2482 continue; 2483 2484 default: 2485 pr_err("%s: invalid new link %d on slave %s\n", 2486 bond->dev->name, slave->new_link, 2487 slave->dev->name); 2488 slave->new_link = BOND_LINK_NOCHANGE; 2489 2490 continue; 2491 } 2492 2493 do_failover: 2494 ASSERT_RTNL(); 2495 block_netpoll_tx(); 2496 write_lock_bh(&bond->curr_slave_lock); 2497 bond_select_active_slave(bond); 2498 write_unlock_bh(&bond->curr_slave_lock); 2499 unblock_netpoll_tx(); 2500 } 2501 2502 bond_set_carrier(bond); 2503 } 2504 2505 /* 2506 * bond_mii_monitor 2507 * 2508 * Really a wrapper that splits the mii monitor into two phases: an 2509 * inspection, then (if inspection indicates something needs to be done) 2510 * an acquisition of appropriate locks followed by a commit phase to 2511 * implement whatever link state changes are indicated. 2512 */ 2513 void bond_mii_monitor(struct work_struct *work) 2514 { 2515 struct bonding *bond = container_of(work, struct bonding, 2516 mii_work.work); 2517 bool should_notify_peers = false; 2518 2519 read_lock(&bond->lock); 2520 if (bond->kill_timers) 2521 goto out; 2522 2523 if (bond->slave_cnt == 0) 2524 goto re_arm; 2525 2526 should_notify_peers = bond_should_notify_peers(bond); 2527 2528 if (bond_miimon_inspect(bond)) { 2529 read_unlock(&bond->lock); 2530 rtnl_lock(); 2531 read_lock(&bond->lock); 2532 2533 bond_miimon_commit(bond); 2534 2535 read_unlock(&bond->lock); 2536 rtnl_unlock(); /* might sleep, hold no other locks */ 2537 read_lock(&bond->lock); 2538 } 2539 2540 re_arm: 2541 if (bond->params.miimon) 2542 queue_delayed_work(bond->wq, &bond->mii_work, 2543 msecs_to_jiffies(bond->params.miimon)); 2544 out: 2545 read_unlock(&bond->lock); 2546 2547 if (should_notify_peers) { 2548 rtnl_lock(); 2549 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS); 2550 rtnl_unlock(); 2551 } 2552 } 2553 2554 static __be32 bond_glean_dev_ip(struct net_device *dev) 2555 { 2556 struct in_device *idev; 2557 struct in_ifaddr *ifa; 2558 __be32 addr = 0; 2559 2560 if (!dev) 2561 return 0; 2562 2563 rcu_read_lock(); 2564 idev = __in_dev_get_rcu(dev); 2565 if (!idev) 2566 goto out; 2567 2568 ifa = idev->ifa_list; 2569 if (!ifa) 2570 goto out; 2571 2572 addr = ifa->ifa_local; 2573 out: 2574 rcu_read_unlock(); 2575 return addr; 2576 } 2577 2578 static int bond_has_this_ip(struct bonding *bond, __be32 ip) 2579 { 2580 struct vlan_entry *vlan; 2581 2582 if (ip == bond->master_ip) 2583 return 1; 2584 2585 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 2586 if (ip == vlan->vlan_ip) 2587 return 1; 2588 } 2589 2590 return 0; 2591 } 2592 2593 /* 2594 * We go to the (large) trouble of VLAN tagging ARP frames because 2595 * switches in VLAN mode (especially if ports are configured as 2596 * "native" to a VLAN) might not pass non-tagged frames. 2597 */ 2598 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id) 2599 { 2600 struct sk_buff *skb; 2601 2602 pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op, 2603 slave_dev->name, dest_ip, src_ip, vlan_id); 2604 2605 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2606 NULL, slave_dev->dev_addr, NULL); 2607 2608 if (!skb) { 2609 pr_err("ARP packet allocation failed\n"); 2610 return; 2611 } 2612 if (vlan_id) { 2613 skb = vlan_put_tag(skb, vlan_id); 2614 if (!skb) { 2615 pr_err("failed to insert VLAN tag\n"); 2616 return; 2617 } 2618 } 2619 arp_xmit(skb); 2620 } 2621 2622 2623 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2624 { 2625 int i, vlan_id; 2626 __be32 *targets = bond->params.arp_targets; 2627 struct vlan_entry *vlan; 2628 struct net_device *vlan_dev; 2629 struct rtable *rt; 2630 2631 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) { 2632 if (!targets[i]) 2633 break; 2634 pr_debug("basa: target %x\n", targets[i]); 2635 if (!bond_vlan_used(bond)) { 2636 pr_debug("basa: empty vlan: arp_send\n"); 2637 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2638 bond->master_ip, 0); 2639 continue; 2640 } 2641 2642 /* 2643 * If VLANs are configured, we do a route lookup to 2644 * determine which VLAN interface would be used, so we 2645 * can tag the ARP with the proper VLAN tag. 2646 */ 2647 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 2648 RTO_ONLINK, 0); 2649 if (IS_ERR(rt)) { 2650 if (net_ratelimit()) { 2651 pr_warning("%s: no route to arp_ip_target %pI4\n", 2652 bond->dev->name, &targets[i]); 2653 } 2654 continue; 2655 } 2656 2657 /* 2658 * This target is not on a VLAN 2659 */ 2660 if (rt->dst.dev == bond->dev) { 2661 ip_rt_put(rt); 2662 pr_debug("basa: rtdev == bond->dev: arp_send\n"); 2663 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2664 bond->master_ip, 0); 2665 continue; 2666 } 2667 2668 vlan_id = 0; 2669 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 2670 rcu_read_lock(); 2671 vlan_dev = __vlan_find_dev_deep(bond->dev, 2672 vlan->vlan_id); 2673 rcu_read_unlock(); 2674 if (vlan_dev == rt->dst.dev) { 2675 vlan_id = vlan->vlan_id; 2676 pr_debug("basa: vlan match on %s %d\n", 2677 vlan_dev->name, vlan_id); 2678 break; 2679 } 2680 } 2681 2682 if (vlan_id) { 2683 ip_rt_put(rt); 2684 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2685 vlan->vlan_ip, vlan_id); 2686 continue; 2687 } 2688 2689 if (net_ratelimit()) { 2690 pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n", 2691 bond->dev->name, &targets[i], 2692 rt->dst.dev ? rt->dst.dev->name : "NULL"); 2693 } 2694 ip_rt_put(rt); 2695 } 2696 } 2697 2698 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 2699 { 2700 int i; 2701 __be32 *targets = bond->params.arp_targets; 2702 2703 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) { 2704 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n", 2705 &sip, &tip, i, &targets[i], 2706 bond_has_this_ip(bond, tip)); 2707 if (sip == targets[i]) { 2708 if (bond_has_this_ip(bond, tip)) 2709 slave->last_arp_rx = jiffies; 2710 return; 2711 } 2712 } 2713 } 2714 2715 static void bond_arp_rcv(struct sk_buff *skb, struct bonding *bond, 2716 struct slave *slave) 2717 { 2718 struct arphdr *arp; 2719 unsigned char *arp_ptr; 2720 __be32 sip, tip; 2721 2722 if (skb->protocol != __cpu_to_be16(ETH_P_ARP)) 2723 return; 2724 2725 read_lock(&bond->lock); 2726 2727 pr_debug("bond_arp_rcv: bond %s skb->dev %s\n", 2728 bond->dev->name, skb->dev->name); 2729 2730 if (!pskb_may_pull(skb, arp_hdr_len(bond->dev))) 2731 goto out_unlock; 2732 2733 arp = arp_hdr(skb); 2734 if (arp->ar_hln != bond->dev->addr_len || 2735 skb->pkt_type == PACKET_OTHERHOST || 2736 skb->pkt_type == PACKET_LOOPBACK || 2737 arp->ar_hrd != htons(ARPHRD_ETHER) || 2738 arp->ar_pro != htons(ETH_P_IP) || 2739 arp->ar_pln != 4) 2740 goto out_unlock; 2741 2742 arp_ptr = (unsigned char *)(arp + 1); 2743 arp_ptr += bond->dev->addr_len; 2744 memcpy(&sip, arp_ptr, 4); 2745 arp_ptr += 4 + bond->dev->addr_len; 2746 memcpy(&tip, arp_ptr, 4); 2747 2748 pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n", 2749 bond->dev->name, slave->dev->name, bond_slave_state(slave), 2750 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 2751 &sip, &tip); 2752 2753 /* 2754 * Backup slaves won't see the ARP reply, but do come through 2755 * here for each ARP probe (so we swap the sip/tip to validate 2756 * the probe). In a "redundant switch, common router" type of 2757 * configuration, the ARP probe will (hopefully) travel from 2758 * the active, through one switch, the router, then the other 2759 * switch before reaching the backup. 2760 */ 2761 if (bond_is_active_slave(slave)) 2762 bond_validate_arp(bond, slave, sip, tip); 2763 else 2764 bond_validate_arp(bond, slave, tip, sip); 2765 2766 out_unlock: 2767 read_unlock(&bond->lock); 2768 } 2769 2770 /* 2771 * this function is called regularly to monitor each slave's link 2772 * ensuring that traffic is being sent and received when arp monitoring 2773 * is used in load-balancing mode. if the adapter has been dormant, then an 2774 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 2775 * arp monitoring in active backup mode. 2776 */ 2777 void bond_loadbalance_arp_mon(struct work_struct *work) 2778 { 2779 struct bonding *bond = container_of(work, struct bonding, 2780 arp_work.work); 2781 struct slave *slave, *oldcurrent; 2782 int do_failover = 0; 2783 int delta_in_ticks; 2784 int i; 2785 2786 read_lock(&bond->lock); 2787 2788 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2789 2790 if (bond->kill_timers) 2791 goto out; 2792 2793 if (bond->slave_cnt == 0) 2794 goto re_arm; 2795 2796 read_lock(&bond->curr_slave_lock); 2797 oldcurrent = bond->curr_active_slave; 2798 read_unlock(&bond->curr_slave_lock); 2799 2800 /* see if any of the previous devices are up now (i.e. they have 2801 * xmt and rcv traffic). the curr_active_slave does not come into 2802 * the picture unless it is null. also, slave->jiffies is not needed 2803 * here because we send an arp on each slave and give a slave as 2804 * long as it needs to get the tx/rx within the delta. 2805 * TODO: what about up/down delay in arp mode? it wasn't here before 2806 * so it can wait 2807 */ 2808 bond_for_each_slave(bond, slave, i) { 2809 unsigned long trans_start = dev_trans_start(slave->dev); 2810 2811 if (slave->link != BOND_LINK_UP) { 2812 if (time_in_range(jiffies, 2813 trans_start - delta_in_ticks, 2814 trans_start + delta_in_ticks) && 2815 time_in_range(jiffies, 2816 slave->dev->last_rx - delta_in_ticks, 2817 slave->dev->last_rx + delta_in_ticks)) { 2818 2819 slave->link = BOND_LINK_UP; 2820 bond_set_active_slave(slave); 2821 2822 /* primary_slave has no meaning in round-robin 2823 * mode. the window of a slave being up and 2824 * curr_active_slave being null after enslaving 2825 * is closed. 2826 */ 2827 if (!oldcurrent) { 2828 pr_info("%s: link status definitely up for interface %s, ", 2829 bond->dev->name, 2830 slave->dev->name); 2831 do_failover = 1; 2832 } else { 2833 pr_info("%s: interface %s is now up\n", 2834 bond->dev->name, 2835 slave->dev->name); 2836 } 2837 } 2838 } else { 2839 /* slave->link == BOND_LINK_UP */ 2840 2841 /* not all switches will respond to an arp request 2842 * when the source ip is 0, so don't take the link down 2843 * if we don't know our ip yet 2844 */ 2845 if (!time_in_range(jiffies, 2846 trans_start - delta_in_ticks, 2847 trans_start + 2 * delta_in_ticks) || 2848 !time_in_range(jiffies, 2849 slave->dev->last_rx - delta_in_ticks, 2850 slave->dev->last_rx + 2 * delta_in_ticks)) { 2851 2852 slave->link = BOND_LINK_DOWN; 2853 bond_set_backup_slave(slave); 2854 2855 if (slave->link_failure_count < UINT_MAX) 2856 slave->link_failure_count++; 2857 2858 pr_info("%s: interface %s is now down.\n", 2859 bond->dev->name, 2860 slave->dev->name); 2861 2862 if (slave == oldcurrent) 2863 do_failover = 1; 2864 } 2865 } 2866 2867 /* note: if switch is in round-robin mode, all links 2868 * must tx arp to ensure all links rx an arp - otherwise 2869 * links may oscillate or not come up at all; if switch is 2870 * in something like xor mode, there is nothing we can 2871 * do - all replies will be rx'ed on same link causing slaves 2872 * to be unstable during low/no traffic periods 2873 */ 2874 if (IS_UP(slave->dev)) 2875 bond_arp_send_all(bond, slave); 2876 } 2877 2878 if (do_failover) { 2879 block_netpoll_tx(); 2880 write_lock_bh(&bond->curr_slave_lock); 2881 2882 bond_select_active_slave(bond); 2883 2884 write_unlock_bh(&bond->curr_slave_lock); 2885 unblock_netpoll_tx(); 2886 } 2887 2888 re_arm: 2889 if (bond->params.arp_interval) 2890 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 2891 out: 2892 read_unlock(&bond->lock); 2893 } 2894 2895 /* 2896 * Called to inspect slaves for active-backup mode ARP monitor link state 2897 * changes. Sets new_link in slaves to specify what action should take 2898 * place for the slave. Returns 0 if no changes are found, >0 if changes 2899 * to link states must be committed. 2900 * 2901 * Called with bond->lock held for read. 2902 */ 2903 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks) 2904 { 2905 struct slave *slave; 2906 int i, commit = 0; 2907 unsigned long trans_start; 2908 2909 bond_for_each_slave(bond, slave, i) { 2910 slave->new_link = BOND_LINK_NOCHANGE; 2911 2912 if (slave->link != BOND_LINK_UP) { 2913 if (time_in_range(jiffies, 2914 slave_last_rx(bond, slave) - delta_in_ticks, 2915 slave_last_rx(bond, slave) + delta_in_ticks)) { 2916 2917 slave->new_link = BOND_LINK_UP; 2918 commit++; 2919 } 2920 2921 continue; 2922 } 2923 2924 /* 2925 * Give slaves 2*delta after being enslaved or made 2926 * active. This avoids bouncing, as the last receive 2927 * times need a full ARP monitor cycle to be updated. 2928 */ 2929 if (time_in_range(jiffies, 2930 slave->jiffies - delta_in_ticks, 2931 slave->jiffies + 2 * delta_in_ticks)) 2932 continue; 2933 2934 /* 2935 * Backup slave is down if: 2936 * - No current_arp_slave AND 2937 * - more than 3*delta since last receive AND 2938 * - the bond has an IP address 2939 * 2940 * Note: a non-null current_arp_slave indicates 2941 * the curr_active_slave went down and we are 2942 * searching for a new one; under this condition 2943 * we only take the curr_active_slave down - this 2944 * gives each slave a chance to tx/rx traffic 2945 * before being taken out 2946 */ 2947 if (!bond_is_active_slave(slave) && 2948 !bond->current_arp_slave && 2949 !time_in_range(jiffies, 2950 slave_last_rx(bond, slave) - delta_in_ticks, 2951 slave_last_rx(bond, slave) + 3 * delta_in_ticks)) { 2952 2953 slave->new_link = BOND_LINK_DOWN; 2954 commit++; 2955 } 2956 2957 /* 2958 * Active slave is down if: 2959 * - more than 2*delta since transmitting OR 2960 * - (more than 2*delta since receive AND 2961 * the bond has an IP address) 2962 */ 2963 trans_start = dev_trans_start(slave->dev); 2964 if (bond_is_active_slave(slave) && 2965 (!time_in_range(jiffies, 2966 trans_start - delta_in_ticks, 2967 trans_start + 2 * delta_in_ticks) || 2968 !time_in_range(jiffies, 2969 slave_last_rx(bond, slave) - delta_in_ticks, 2970 slave_last_rx(bond, slave) + 2 * delta_in_ticks))) { 2971 2972 slave->new_link = BOND_LINK_DOWN; 2973 commit++; 2974 } 2975 } 2976 2977 return commit; 2978 } 2979 2980 /* 2981 * Called to commit link state changes noted by inspection step of 2982 * active-backup mode ARP monitor. 2983 * 2984 * Called with RTNL and bond->lock for read. 2985 */ 2986 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks) 2987 { 2988 struct slave *slave; 2989 int i; 2990 unsigned long trans_start; 2991 2992 bond_for_each_slave(bond, slave, i) { 2993 switch (slave->new_link) { 2994 case BOND_LINK_NOCHANGE: 2995 continue; 2996 2997 case BOND_LINK_UP: 2998 trans_start = dev_trans_start(slave->dev); 2999 if ((!bond->curr_active_slave && 3000 time_in_range(jiffies, 3001 trans_start - delta_in_ticks, 3002 trans_start + delta_in_ticks)) || 3003 bond->curr_active_slave != slave) { 3004 slave->link = BOND_LINK_UP; 3005 bond->current_arp_slave = NULL; 3006 3007 pr_info("%s: link status definitely up for interface %s.\n", 3008 bond->dev->name, slave->dev->name); 3009 3010 if (!bond->curr_active_slave || 3011 (slave == bond->primary_slave)) 3012 goto do_failover; 3013 3014 } 3015 3016 continue; 3017 3018 case BOND_LINK_DOWN: 3019 if (slave->link_failure_count < UINT_MAX) 3020 slave->link_failure_count++; 3021 3022 slave->link = BOND_LINK_DOWN; 3023 bond_set_slave_inactive_flags(slave); 3024 3025 pr_info("%s: link status definitely down for interface %s, disabling it\n", 3026 bond->dev->name, slave->dev->name); 3027 3028 if (slave == bond->curr_active_slave) { 3029 bond->current_arp_slave = NULL; 3030 goto do_failover; 3031 } 3032 3033 continue; 3034 3035 default: 3036 pr_err("%s: impossible: new_link %d on slave %s\n", 3037 bond->dev->name, slave->new_link, 3038 slave->dev->name); 3039 continue; 3040 } 3041 3042 do_failover: 3043 ASSERT_RTNL(); 3044 block_netpoll_tx(); 3045 write_lock_bh(&bond->curr_slave_lock); 3046 bond_select_active_slave(bond); 3047 write_unlock_bh(&bond->curr_slave_lock); 3048 unblock_netpoll_tx(); 3049 } 3050 3051 bond_set_carrier(bond); 3052 } 3053 3054 /* 3055 * Send ARP probes for active-backup mode ARP monitor. 3056 * 3057 * Called with bond->lock held for read. 3058 */ 3059 static void bond_ab_arp_probe(struct bonding *bond) 3060 { 3061 struct slave *slave; 3062 int i; 3063 3064 read_lock(&bond->curr_slave_lock); 3065 3066 if (bond->current_arp_slave && bond->curr_active_slave) 3067 pr_info("PROBE: c_arp %s && cas %s BAD\n", 3068 bond->current_arp_slave->dev->name, 3069 bond->curr_active_slave->dev->name); 3070 3071 if (bond->curr_active_slave) { 3072 bond_arp_send_all(bond, bond->curr_active_slave); 3073 read_unlock(&bond->curr_slave_lock); 3074 return; 3075 } 3076 3077 read_unlock(&bond->curr_slave_lock); 3078 3079 /* if we don't have a curr_active_slave, search for the next available 3080 * backup slave from the current_arp_slave and make it the candidate 3081 * for becoming the curr_active_slave 3082 */ 3083 3084 if (!bond->current_arp_slave) { 3085 bond->current_arp_slave = bond->first_slave; 3086 if (!bond->current_arp_slave) 3087 return; 3088 } 3089 3090 bond_set_slave_inactive_flags(bond->current_arp_slave); 3091 3092 /* search for next candidate */ 3093 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) { 3094 if (IS_UP(slave->dev)) { 3095 slave->link = BOND_LINK_BACK; 3096 bond_set_slave_active_flags(slave); 3097 bond_arp_send_all(bond, slave); 3098 slave->jiffies = jiffies; 3099 bond->current_arp_slave = slave; 3100 break; 3101 } 3102 3103 /* if the link state is up at this point, we 3104 * mark it down - this can happen if we have 3105 * simultaneous link failures and 3106 * reselect_active_interface doesn't make this 3107 * one the current slave so it is still marked 3108 * up when it is actually down 3109 */ 3110 if (slave->link == BOND_LINK_UP) { 3111 slave->link = BOND_LINK_DOWN; 3112 if (slave->link_failure_count < UINT_MAX) 3113 slave->link_failure_count++; 3114 3115 bond_set_slave_inactive_flags(slave); 3116 3117 pr_info("%s: backup interface %s is now down.\n", 3118 bond->dev->name, slave->dev->name); 3119 } 3120 } 3121 } 3122 3123 void bond_activebackup_arp_mon(struct work_struct *work) 3124 { 3125 struct bonding *bond = container_of(work, struct bonding, 3126 arp_work.work); 3127 bool should_notify_peers = false; 3128 int delta_in_ticks; 3129 3130 read_lock(&bond->lock); 3131 3132 if (bond->kill_timers) 3133 goto out; 3134 3135 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3136 3137 if (bond->slave_cnt == 0) 3138 goto re_arm; 3139 3140 should_notify_peers = bond_should_notify_peers(bond); 3141 3142 if (bond_ab_arp_inspect(bond, delta_in_ticks)) { 3143 read_unlock(&bond->lock); 3144 rtnl_lock(); 3145 read_lock(&bond->lock); 3146 3147 bond_ab_arp_commit(bond, delta_in_ticks); 3148 3149 read_unlock(&bond->lock); 3150 rtnl_unlock(); 3151 read_lock(&bond->lock); 3152 } 3153 3154 bond_ab_arp_probe(bond); 3155 3156 re_arm: 3157 if (bond->params.arp_interval) 3158 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 3159 out: 3160 read_unlock(&bond->lock); 3161 3162 if (should_notify_peers) { 3163 rtnl_lock(); 3164 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS); 3165 rtnl_unlock(); 3166 } 3167 } 3168 3169 /*-------------------------- netdev event handling --------------------------*/ 3170 3171 /* 3172 * Change device name 3173 */ 3174 static int bond_event_changename(struct bonding *bond) 3175 { 3176 bond_remove_proc_entry(bond); 3177 bond_create_proc_entry(bond); 3178 3179 bond_debug_reregister(bond); 3180 3181 return NOTIFY_DONE; 3182 } 3183 3184 static int bond_master_netdev_event(unsigned long event, 3185 struct net_device *bond_dev) 3186 { 3187 struct bonding *event_bond = netdev_priv(bond_dev); 3188 3189 switch (event) { 3190 case NETDEV_CHANGENAME: 3191 return bond_event_changename(event_bond); 3192 default: 3193 break; 3194 } 3195 3196 return NOTIFY_DONE; 3197 } 3198 3199 static int bond_slave_netdev_event(unsigned long event, 3200 struct net_device *slave_dev) 3201 { 3202 struct net_device *bond_dev = slave_dev->master; 3203 struct bonding *bond = netdev_priv(bond_dev); 3204 3205 switch (event) { 3206 case NETDEV_UNREGISTER: 3207 if (bond_dev) { 3208 if (bond->setup_by_slave) 3209 bond_release_and_destroy(bond_dev, slave_dev); 3210 else 3211 bond_release(bond_dev, slave_dev); 3212 } 3213 break; 3214 case NETDEV_CHANGE: 3215 if (bond->params.mode == BOND_MODE_8023AD || bond_is_lb(bond)) { 3216 struct slave *slave; 3217 3218 slave = bond_get_slave_by_dev(bond, slave_dev); 3219 if (slave) { 3220 u32 old_speed = slave->speed; 3221 u8 old_duplex = slave->duplex; 3222 3223 bond_update_speed_duplex(slave); 3224 3225 if (bond_is_lb(bond)) 3226 break; 3227 3228 if (old_speed != slave->speed) 3229 bond_3ad_adapter_speed_changed(slave); 3230 if (old_duplex != slave->duplex) 3231 bond_3ad_adapter_duplex_changed(slave); 3232 } 3233 } 3234 3235 break; 3236 case NETDEV_DOWN: 3237 /* 3238 * ... Or is it this? 3239 */ 3240 break; 3241 case NETDEV_CHANGEMTU: 3242 /* 3243 * TODO: Should slaves be allowed to 3244 * independently alter their MTU? For 3245 * an active-backup bond, slaves need 3246 * not be the same type of device, so 3247 * MTUs may vary. For other modes, 3248 * slaves arguably should have the 3249 * same MTUs. To do this, we'd need to 3250 * take over the slave's change_mtu 3251 * function for the duration of their 3252 * servitude. 3253 */ 3254 break; 3255 case NETDEV_CHANGENAME: 3256 /* 3257 * TODO: handle changing the primary's name 3258 */ 3259 break; 3260 case NETDEV_FEAT_CHANGE: 3261 bond_compute_features(bond); 3262 break; 3263 default: 3264 break; 3265 } 3266 3267 return NOTIFY_DONE; 3268 } 3269 3270 /* 3271 * bond_netdev_event: handle netdev notifier chain events. 3272 * 3273 * This function receives events for the netdev chain. The caller (an 3274 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 3275 * locks for us to safely manipulate the slave devices (RTNL lock, 3276 * dev_probe_lock). 3277 */ 3278 static int bond_netdev_event(struct notifier_block *this, 3279 unsigned long event, void *ptr) 3280 { 3281 struct net_device *event_dev = (struct net_device *)ptr; 3282 3283 pr_debug("event_dev: %s, event: %lx\n", 3284 event_dev ? event_dev->name : "None", 3285 event); 3286 3287 if (!(event_dev->priv_flags & IFF_BONDING)) 3288 return NOTIFY_DONE; 3289 3290 if (event_dev->flags & IFF_MASTER) { 3291 pr_debug("IFF_MASTER\n"); 3292 return bond_master_netdev_event(event, event_dev); 3293 } 3294 3295 if (event_dev->flags & IFF_SLAVE) { 3296 pr_debug("IFF_SLAVE\n"); 3297 return bond_slave_netdev_event(event, event_dev); 3298 } 3299 3300 return NOTIFY_DONE; 3301 } 3302 3303 /* 3304 * bond_inetaddr_event: handle inetaddr notifier chain events. 3305 * 3306 * We keep track of device IPs primarily to use as source addresses in 3307 * ARP monitor probes (rather than spewing out broadcasts all the time). 3308 * 3309 * We track one IP for the main device (if it has one), plus one per VLAN. 3310 */ 3311 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) 3312 { 3313 struct in_ifaddr *ifa = ptr; 3314 struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev; 3315 struct bond_net *bn = net_generic(dev_net(event_dev), bond_net_id); 3316 struct bonding *bond; 3317 struct vlan_entry *vlan; 3318 3319 list_for_each_entry(bond, &bn->dev_list, bond_list) { 3320 if (bond->dev == event_dev) { 3321 switch (event) { 3322 case NETDEV_UP: 3323 bond->master_ip = ifa->ifa_local; 3324 return NOTIFY_OK; 3325 case NETDEV_DOWN: 3326 bond->master_ip = bond_glean_dev_ip(bond->dev); 3327 return NOTIFY_OK; 3328 default: 3329 return NOTIFY_DONE; 3330 } 3331 } 3332 3333 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 3334 vlan_dev = __vlan_find_dev_deep(bond->dev, 3335 vlan->vlan_id); 3336 if (vlan_dev == event_dev) { 3337 switch (event) { 3338 case NETDEV_UP: 3339 vlan->vlan_ip = ifa->ifa_local; 3340 return NOTIFY_OK; 3341 case NETDEV_DOWN: 3342 vlan->vlan_ip = 3343 bond_glean_dev_ip(vlan_dev); 3344 return NOTIFY_OK; 3345 default: 3346 return NOTIFY_DONE; 3347 } 3348 } 3349 } 3350 } 3351 return NOTIFY_DONE; 3352 } 3353 3354 static struct notifier_block bond_netdev_notifier = { 3355 .notifier_call = bond_netdev_event, 3356 }; 3357 3358 static struct notifier_block bond_inetaddr_notifier = { 3359 .notifier_call = bond_inetaddr_event, 3360 }; 3361 3362 /*---------------------------- Hashing Policies -----------------------------*/ 3363 3364 /* 3365 * Hash for the output device based upon layer 2 and layer 3 data. If 3366 * the packet is not IP mimic bond_xmit_hash_policy_l2() 3367 */ 3368 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count) 3369 { 3370 struct ethhdr *data = (struct ethhdr *)skb->data; 3371 struct iphdr *iph = ip_hdr(skb); 3372 3373 if (skb->protocol == htons(ETH_P_IP)) { 3374 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^ 3375 (data->h_dest[5] ^ data->h_source[5])) % count; 3376 } 3377 3378 return (data->h_dest[5] ^ data->h_source[5]) % count; 3379 } 3380 3381 /* 3382 * Hash for the output device based upon layer 3 and layer 4 data. If 3383 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is 3384 * altogether not IP, mimic bond_xmit_hash_policy_l2() 3385 */ 3386 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count) 3387 { 3388 struct ethhdr *data = (struct ethhdr *)skb->data; 3389 struct iphdr *iph = ip_hdr(skb); 3390 __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl); 3391 int layer4_xor = 0; 3392 3393 if (skb->protocol == htons(ETH_P_IP)) { 3394 if (!ip_is_fragment(iph) && 3395 (iph->protocol == IPPROTO_TCP || 3396 iph->protocol == IPPROTO_UDP)) { 3397 layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1))); 3398 } 3399 return (layer4_xor ^ 3400 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count; 3401 3402 } 3403 3404 return (data->h_dest[5] ^ data->h_source[5]) % count; 3405 } 3406 3407 /* 3408 * Hash for the output device based upon layer 2 data 3409 */ 3410 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count) 3411 { 3412 struct ethhdr *data = (struct ethhdr *)skb->data; 3413 3414 return (data->h_dest[5] ^ data->h_source[5]) % count; 3415 } 3416 3417 /*-------------------------- Device entry points ----------------------------*/ 3418 3419 static int bond_open(struct net_device *bond_dev) 3420 { 3421 struct bonding *bond = netdev_priv(bond_dev); 3422 struct slave *slave; 3423 int i; 3424 3425 bond->kill_timers = 0; 3426 3427 /* reset slave->backup and slave->inactive */ 3428 read_lock(&bond->lock); 3429 if (bond->slave_cnt > 0) { 3430 read_lock(&bond->curr_slave_lock); 3431 bond_for_each_slave(bond, slave, i) { 3432 if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) 3433 && (slave != bond->curr_active_slave)) { 3434 bond_set_slave_inactive_flags(slave); 3435 } else { 3436 bond_set_slave_active_flags(slave); 3437 } 3438 } 3439 read_unlock(&bond->curr_slave_lock); 3440 } 3441 read_unlock(&bond->lock); 3442 3443 INIT_DELAYED_WORK(&bond->mcast_work, bond_resend_igmp_join_requests_delayed); 3444 3445 if (bond_is_lb(bond)) { 3446 /* bond_alb_initialize must be called before the timer 3447 * is started. 3448 */ 3449 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) { 3450 /* something went wrong - fail the open operation */ 3451 return -ENOMEM; 3452 } 3453 3454 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 3455 queue_delayed_work(bond->wq, &bond->alb_work, 0); 3456 } 3457 3458 if (bond->params.miimon) { /* link check interval, in milliseconds. */ 3459 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 3460 queue_delayed_work(bond->wq, &bond->mii_work, 0); 3461 } 3462 3463 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 3464 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) 3465 INIT_DELAYED_WORK(&bond->arp_work, 3466 bond_activebackup_arp_mon); 3467 else 3468 INIT_DELAYED_WORK(&bond->arp_work, 3469 bond_loadbalance_arp_mon); 3470 3471 queue_delayed_work(bond->wq, &bond->arp_work, 0); 3472 if (bond->params.arp_validate) 3473 bond->recv_probe = bond_arp_rcv; 3474 } 3475 3476 if (bond->params.mode == BOND_MODE_8023AD) { 3477 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 3478 queue_delayed_work(bond->wq, &bond->ad_work, 0); 3479 /* register to receive LACPDUs */ 3480 bond->recv_probe = bond_3ad_lacpdu_recv; 3481 bond_3ad_initiate_agg_selection(bond, 1); 3482 } 3483 3484 return 0; 3485 } 3486 3487 static int bond_close(struct net_device *bond_dev) 3488 { 3489 struct bonding *bond = netdev_priv(bond_dev); 3490 3491 write_lock_bh(&bond->lock); 3492 3493 bond->send_peer_notif = 0; 3494 3495 /* signal timers not to re-arm */ 3496 bond->kill_timers = 1; 3497 3498 write_unlock_bh(&bond->lock); 3499 3500 if (bond->params.miimon) { /* link check interval, in milliseconds. */ 3501 cancel_delayed_work(&bond->mii_work); 3502 } 3503 3504 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 3505 cancel_delayed_work(&bond->arp_work); 3506 } 3507 3508 switch (bond->params.mode) { 3509 case BOND_MODE_8023AD: 3510 cancel_delayed_work(&bond->ad_work); 3511 break; 3512 case BOND_MODE_TLB: 3513 case BOND_MODE_ALB: 3514 cancel_delayed_work(&bond->alb_work); 3515 break; 3516 default: 3517 break; 3518 } 3519 3520 if (delayed_work_pending(&bond->mcast_work)) 3521 cancel_delayed_work(&bond->mcast_work); 3522 3523 if (bond_is_lb(bond)) { 3524 /* Must be called only after all 3525 * slaves have been released 3526 */ 3527 bond_alb_deinitialize(bond); 3528 } 3529 bond->recv_probe = NULL; 3530 3531 return 0; 3532 } 3533 3534 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev, 3535 struct rtnl_link_stats64 *stats) 3536 { 3537 struct bonding *bond = netdev_priv(bond_dev); 3538 struct rtnl_link_stats64 temp; 3539 struct slave *slave; 3540 int i; 3541 3542 memset(stats, 0, sizeof(*stats)); 3543 3544 read_lock_bh(&bond->lock); 3545 3546 bond_for_each_slave(bond, slave, i) { 3547 const struct rtnl_link_stats64 *sstats = 3548 dev_get_stats(slave->dev, &temp); 3549 3550 stats->rx_packets += sstats->rx_packets; 3551 stats->rx_bytes += sstats->rx_bytes; 3552 stats->rx_errors += sstats->rx_errors; 3553 stats->rx_dropped += sstats->rx_dropped; 3554 3555 stats->tx_packets += sstats->tx_packets; 3556 stats->tx_bytes += sstats->tx_bytes; 3557 stats->tx_errors += sstats->tx_errors; 3558 stats->tx_dropped += sstats->tx_dropped; 3559 3560 stats->multicast += sstats->multicast; 3561 stats->collisions += sstats->collisions; 3562 3563 stats->rx_length_errors += sstats->rx_length_errors; 3564 stats->rx_over_errors += sstats->rx_over_errors; 3565 stats->rx_crc_errors += sstats->rx_crc_errors; 3566 stats->rx_frame_errors += sstats->rx_frame_errors; 3567 stats->rx_fifo_errors += sstats->rx_fifo_errors; 3568 stats->rx_missed_errors += sstats->rx_missed_errors; 3569 3570 stats->tx_aborted_errors += sstats->tx_aborted_errors; 3571 stats->tx_carrier_errors += sstats->tx_carrier_errors; 3572 stats->tx_fifo_errors += sstats->tx_fifo_errors; 3573 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors; 3574 stats->tx_window_errors += sstats->tx_window_errors; 3575 } 3576 3577 read_unlock_bh(&bond->lock); 3578 3579 return stats; 3580 } 3581 3582 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 3583 { 3584 struct net_device *slave_dev = NULL; 3585 struct ifbond k_binfo; 3586 struct ifbond __user *u_binfo = NULL; 3587 struct ifslave k_sinfo; 3588 struct ifslave __user *u_sinfo = NULL; 3589 struct mii_ioctl_data *mii = NULL; 3590 int res = 0; 3591 3592 pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd); 3593 3594 switch (cmd) { 3595 case SIOCGMIIPHY: 3596 mii = if_mii(ifr); 3597 if (!mii) 3598 return -EINVAL; 3599 3600 mii->phy_id = 0; 3601 /* Fall Through */ 3602 case SIOCGMIIREG: 3603 /* 3604 * We do this again just in case we were called by SIOCGMIIREG 3605 * instead of SIOCGMIIPHY. 3606 */ 3607 mii = if_mii(ifr); 3608 if (!mii) 3609 return -EINVAL; 3610 3611 3612 if (mii->reg_num == 1) { 3613 struct bonding *bond = netdev_priv(bond_dev); 3614 mii->val_out = 0; 3615 read_lock(&bond->lock); 3616 read_lock(&bond->curr_slave_lock); 3617 if (netif_carrier_ok(bond->dev)) 3618 mii->val_out = BMSR_LSTATUS; 3619 3620 read_unlock(&bond->curr_slave_lock); 3621 read_unlock(&bond->lock); 3622 } 3623 3624 return 0; 3625 case BOND_INFO_QUERY_OLD: 3626 case SIOCBONDINFOQUERY: 3627 u_binfo = (struct ifbond __user *)ifr->ifr_data; 3628 3629 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 3630 return -EFAULT; 3631 3632 res = bond_info_query(bond_dev, &k_binfo); 3633 if (res == 0 && 3634 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 3635 return -EFAULT; 3636 3637 return res; 3638 case BOND_SLAVE_INFO_QUERY_OLD: 3639 case SIOCBONDSLAVEINFOQUERY: 3640 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 3641 3642 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 3643 return -EFAULT; 3644 3645 res = bond_slave_info_query(bond_dev, &k_sinfo); 3646 if (res == 0 && 3647 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 3648 return -EFAULT; 3649 3650 return res; 3651 default: 3652 /* Go on */ 3653 break; 3654 } 3655 3656 if (!capable(CAP_NET_ADMIN)) 3657 return -EPERM; 3658 3659 slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave); 3660 3661 pr_debug("slave_dev=%p:\n", slave_dev); 3662 3663 if (!slave_dev) 3664 res = -ENODEV; 3665 else { 3666 pr_debug("slave_dev->name=%s:\n", slave_dev->name); 3667 switch (cmd) { 3668 case BOND_ENSLAVE_OLD: 3669 case SIOCBONDENSLAVE: 3670 res = bond_enslave(bond_dev, slave_dev); 3671 break; 3672 case BOND_RELEASE_OLD: 3673 case SIOCBONDRELEASE: 3674 res = bond_release(bond_dev, slave_dev); 3675 break; 3676 case BOND_SETHWADDR_OLD: 3677 case SIOCBONDSETHWADDR: 3678 res = bond_sethwaddr(bond_dev, slave_dev); 3679 break; 3680 case BOND_CHANGE_ACTIVE_OLD: 3681 case SIOCBONDCHANGEACTIVE: 3682 res = bond_ioctl_change_active(bond_dev, slave_dev); 3683 break; 3684 default: 3685 res = -EOPNOTSUPP; 3686 } 3687 3688 dev_put(slave_dev); 3689 } 3690 3691 return res; 3692 } 3693 3694 static bool bond_addr_in_mc_list(unsigned char *addr, 3695 struct netdev_hw_addr_list *list, 3696 int addrlen) 3697 { 3698 struct netdev_hw_addr *ha; 3699 3700 netdev_hw_addr_list_for_each(ha, list) 3701 if (!memcmp(ha->addr, addr, addrlen)) 3702 return true; 3703 3704 return false; 3705 } 3706 3707 static void bond_set_multicast_list(struct net_device *bond_dev) 3708 { 3709 struct bonding *bond = netdev_priv(bond_dev); 3710 struct netdev_hw_addr *ha; 3711 bool found; 3712 3713 /* 3714 * Do promisc before checking multicast_mode 3715 */ 3716 if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) 3717 /* 3718 * FIXME: Need to handle the error when one of the multi-slaves 3719 * encounters error. 3720 */ 3721 bond_set_promiscuity(bond, 1); 3722 3723 3724 if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) 3725 bond_set_promiscuity(bond, -1); 3726 3727 3728 /* set allmulti flag to slaves */ 3729 if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) 3730 /* 3731 * FIXME: Need to handle the error when one of the multi-slaves 3732 * encounters error. 3733 */ 3734 bond_set_allmulti(bond, 1); 3735 3736 3737 if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) 3738 bond_set_allmulti(bond, -1); 3739 3740 3741 read_lock(&bond->lock); 3742 3743 bond->flags = bond_dev->flags; 3744 3745 /* looking for addresses to add to slaves' mc list */ 3746 netdev_for_each_mc_addr(ha, bond_dev) { 3747 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list, 3748 bond_dev->addr_len); 3749 if (!found) 3750 bond_mc_add(bond, ha->addr); 3751 } 3752 3753 /* looking for addresses to delete from slaves' list */ 3754 netdev_hw_addr_list_for_each(ha, &bond->mc_list) { 3755 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc, 3756 bond_dev->addr_len); 3757 if (!found) 3758 bond_mc_del(bond, ha->addr); 3759 } 3760 3761 /* save master's multicast list */ 3762 __hw_addr_flush(&bond->mc_list); 3763 __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc, 3764 bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST); 3765 3766 read_unlock(&bond->lock); 3767 } 3768 3769 static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms) 3770 { 3771 struct bonding *bond = netdev_priv(dev); 3772 struct slave *slave = bond->first_slave; 3773 3774 if (slave) { 3775 const struct net_device_ops *slave_ops 3776 = slave->dev->netdev_ops; 3777 if (slave_ops->ndo_neigh_setup) 3778 return slave_ops->ndo_neigh_setup(slave->dev, parms); 3779 } 3780 return 0; 3781 } 3782 3783 /* 3784 * Change the MTU of all of a master's slaves to match the master 3785 */ 3786 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 3787 { 3788 struct bonding *bond = netdev_priv(bond_dev); 3789 struct slave *slave, *stop_at; 3790 int res = 0; 3791 int i; 3792 3793 pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond, 3794 (bond_dev ? bond_dev->name : "None"), new_mtu); 3795 3796 /* Can't hold bond->lock with bh disabled here since 3797 * some base drivers panic. On the other hand we can't 3798 * hold bond->lock without bh disabled because we'll 3799 * deadlock. The only solution is to rely on the fact 3800 * that we're under rtnl_lock here, and the slaves 3801 * list won't change. This doesn't solve the problem 3802 * of setting the slave's MTU while it is 3803 * transmitting, but the assumption is that the base 3804 * driver can handle that. 3805 * 3806 * TODO: figure out a way to safely iterate the slaves 3807 * list, but without holding a lock around the actual 3808 * call to the base driver. 3809 */ 3810 3811 bond_for_each_slave(bond, slave, i) { 3812 pr_debug("s %p s->p %p c_m %p\n", 3813 slave, 3814 slave->prev, 3815 slave->dev->netdev_ops->ndo_change_mtu); 3816 3817 res = dev_set_mtu(slave->dev, new_mtu); 3818 3819 if (res) { 3820 /* If we failed to set the slave's mtu to the new value 3821 * we must abort the operation even in ACTIVE_BACKUP 3822 * mode, because if we allow the backup slaves to have 3823 * different mtu values than the active slave we'll 3824 * need to change their mtu when doing a failover. That 3825 * means changing their mtu from timer context, which 3826 * is probably not a good idea. 3827 */ 3828 pr_debug("err %d %s\n", res, slave->dev->name); 3829 goto unwind; 3830 } 3831 } 3832 3833 bond_dev->mtu = new_mtu; 3834 3835 return 0; 3836 3837 unwind: 3838 /* unwind from head to the slave that failed */ 3839 stop_at = slave; 3840 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { 3841 int tmp_res; 3842 3843 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu); 3844 if (tmp_res) { 3845 pr_debug("unwind err %d dev %s\n", 3846 tmp_res, slave->dev->name); 3847 } 3848 } 3849 3850 return res; 3851 } 3852 3853 /* 3854 * Change HW address 3855 * 3856 * Note that many devices must be down to change the HW address, and 3857 * downing the master releases all slaves. We can make bonds full of 3858 * bonding devices to test this, however. 3859 */ 3860 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 3861 { 3862 struct bonding *bond = netdev_priv(bond_dev); 3863 struct sockaddr *sa = addr, tmp_sa; 3864 struct slave *slave, *stop_at; 3865 int res = 0; 3866 int i; 3867 3868 if (bond->params.mode == BOND_MODE_ALB) 3869 return bond_alb_set_mac_address(bond_dev, addr); 3870 3871 3872 pr_debug("bond=%p, name=%s\n", 3873 bond, bond_dev ? bond_dev->name : "None"); 3874 3875 /* 3876 * If fail_over_mac is set to active, do nothing and return 3877 * success. Returning an error causes ifenslave to fail. 3878 */ 3879 if (bond->params.fail_over_mac == BOND_FOM_ACTIVE) 3880 return 0; 3881 3882 if (!is_valid_ether_addr(sa->sa_data)) 3883 return -EADDRNOTAVAIL; 3884 3885 /* Can't hold bond->lock with bh disabled here since 3886 * some base drivers panic. On the other hand we can't 3887 * hold bond->lock without bh disabled because we'll 3888 * deadlock. The only solution is to rely on the fact 3889 * that we're under rtnl_lock here, and the slaves 3890 * list won't change. This doesn't solve the problem 3891 * of setting the slave's hw address while it is 3892 * transmitting, but the assumption is that the base 3893 * driver can handle that. 3894 * 3895 * TODO: figure out a way to safely iterate the slaves 3896 * list, but without holding a lock around the actual 3897 * call to the base driver. 3898 */ 3899 3900 bond_for_each_slave(bond, slave, i) { 3901 const struct net_device_ops *slave_ops = slave->dev->netdev_ops; 3902 pr_debug("slave %p %s\n", slave, slave->dev->name); 3903 3904 if (slave_ops->ndo_set_mac_address == NULL) { 3905 res = -EOPNOTSUPP; 3906 pr_debug("EOPNOTSUPP %s\n", slave->dev->name); 3907 goto unwind; 3908 } 3909 3910 res = dev_set_mac_address(slave->dev, addr); 3911 if (res) { 3912 /* TODO: consider downing the slave 3913 * and retry ? 3914 * User should expect communications 3915 * breakage anyway until ARP finish 3916 * updating, so... 3917 */ 3918 pr_debug("err %d %s\n", res, slave->dev->name); 3919 goto unwind; 3920 } 3921 } 3922 3923 /* success */ 3924 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); 3925 return 0; 3926 3927 unwind: 3928 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 3929 tmp_sa.sa_family = bond_dev->type; 3930 3931 /* unwind from head to the slave that failed */ 3932 stop_at = slave; 3933 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { 3934 int tmp_res; 3935 3936 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa); 3937 if (tmp_res) { 3938 pr_debug("unwind err %d dev %s\n", 3939 tmp_res, slave->dev->name); 3940 } 3941 } 3942 3943 return res; 3944 } 3945 3946 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev) 3947 { 3948 struct bonding *bond = netdev_priv(bond_dev); 3949 struct slave *slave, *start_at; 3950 int i, slave_no, res = 1; 3951 struct iphdr *iph = ip_hdr(skb); 3952 3953 /* 3954 * Start with the curr_active_slave that joined the bond as the 3955 * default for sending IGMP traffic. For failover purposes one 3956 * needs to maintain some consistency for the interface that will 3957 * send the join/membership reports. The curr_active_slave found 3958 * will send all of this type of traffic. 3959 */ 3960 if ((iph->protocol == IPPROTO_IGMP) && 3961 (skb->protocol == htons(ETH_P_IP))) { 3962 3963 read_lock(&bond->curr_slave_lock); 3964 slave = bond->curr_active_slave; 3965 read_unlock(&bond->curr_slave_lock); 3966 3967 if (!slave) 3968 goto out; 3969 } else { 3970 /* 3971 * Concurrent TX may collide on rr_tx_counter; we accept 3972 * that as being rare enough not to justify using an 3973 * atomic op here. 3974 */ 3975 slave_no = bond->rr_tx_counter++ % bond->slave_cnt; 3976 3977 bond_for_each_slave(bond, slave, i) { 3978 slave_no--; 3979 if (slave_no < 0) 3980 break; 3981 } 3982 } 3983 3984 start_at = slave; 3985 bond_for_each_slave_from(bond, slave, i, start_at) { 3986 if (IS_UP(slave->dev) && 3987 (slave->link == BOND_LINK_UP) && 3988 bond_is_active_slave(slave)) { 3989 res = bond_dev_queue_xmit(bond, skb, slave->dev); 3990 break; 3991 } 3992 } 3993 3994 out: 3995 if (res) { 3996 /* no suitable interface, frame not sent */ 3997 dev_kfree_skb(skb); 3998 } 3999 4000 return NETDEV_TX_OK; 4001 } 4002 4003 4004 /* 4005 * in active-backup mode, we know that bond->curr_active_slave is always valid if 4006 * the bond has a usable interface. 4007 */ 4008 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev) 4009 { 4010 struct bonding *bond = netdev_priv(bond_dev); 4011 int res = 1; 4012 4013 read_lock(&bond->curr_slave_lock); 4014 4015 if (bond->curr_active_slave) 4016 res = bond_dev_queue_xmit(bond, skb, 4017 bond->curr_active_slave->dev); 4018 4019 if (res) 4020 /* no suitable interface, frame not sent */ 4021 dev_kfree_skb(skb); 4022 4023 read_unlock(&bond->curr_slave_lock); 4024 4025 return NETDEV_TX_OK; 4026 } 4027 4028 /* 4029 * In bond_xmit_xor() , we determine the output device by using a pre- 4030 * determined xmit_hash_policy(), If the selected device is not enabled, 4031 * find the next active slave. 4032 */ 4033 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev) 4034 { 4035 struct bonding *bond = netdev_priv(bond_dev); 4036 struct slave *slave, *start_at; 4037 int slave_no; 4038 int i; 4039 int res = 1; 4040 4041 slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt); 4042 4043 bond_for_each_slave(bond, slave, i) { 4044 slave_no--; 4045 if (slave_no < 0) 4046 break; 4047 } 4048 4049 start_at = slave; 4050 4051 bond_for_each_slave_from(bond, slave, i, start_at) { 4052 if (IS_UP(slave->dev) && 4053 (slave->link == BOND_LINK_UP) && 4054 bond_is_active_slave(slave)) { 4055 res = bond_dev_queue_xmit(bond, skb, slave->dev); 4056 break; 4057 } 4058 } 4059 4060 if (res) { 4061 /* no suitable interface, frame not sent */ 4062 dev_kfree_skb(skb); 4063 } 4064 4065 return NETDEV_TX_OK; 4066 } 4067 4068 /* 4069 * in broadcast mode, we send everything to all usable interfaces. 4070 */ 4071 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev) 4072 { 4073 struct bonding *bond = netdev_priv(bond_dev); 4074 struct slave *slave, *start_at; 4075 struct net_device *tx_dev = NULL; 4076 int i; 4077 int res = 1; 4078 4079 read_lock(&bond->curr_slave_lock); 4080 start_at = bond->curr_active_slave; 4081 read_unlock(&bond->curr_slave_lock); 4082 4083 if (!start_at) 4084 goto out; 4085 4086 bond_for_each_slave_from(bond, slave, i, start_at) { 4087 if (IS_UP(slave->dev) && 4088 (slave->link == BOND_LINK_UP) && 4089 bond_is_active_slave(slave)) { 4090 if (tx_dev) { 4091 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 4092 if (!skb2) { 4093 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n", 4094 bond_dev->name); 4095 continue; 4096 } 4097 4098 res = bond_dev_queue_xmit(bond, skb2, tx_dev); 4099 if (res) { 4100 dev_kfree_skb(skb2); 4101 continue; 4102 } 4103 } 4104 tx_dev = slave->dev; 4105 } 4106 } 4107 4108 if (tx_dev) 4109 res = bond_dev_queue_xmit(bond, skb, tx_dev); 4110 4111 out: 4112 if (res) 4113 /* no suitable interface, frame not sent */ 4114 dev_kfree_skb(skb); 4115 4116 /* frame sent to all suitable interfaces */ 4117 return NETDEV_TX_OK; 4118 } 4119 4120 /*------------------------- Device initialization ---------------------------*/ 4121 4122 static void bond_set_xmit_hash_policy(struct bonding *bond) 4123 { 4124 switch (bond->params.xmit_policy) { 4125 case BOND_XMIT_POLICY_LAYER23: 4126 bond->xmit_hash_policy = bond_xmit_hash_policy_l23; 4127 break; 4128 case BOND_XMIT_POLICY_LAYER34: 4129 bond->xmit_hash_policy = bond_xmit_hash_policy_l34; 4130 break; 4131 case BOND_XMIT_POLICY_LAYER2: 4132 default: 4133 bond->xmit_hash_policy = bond_xmit_hash_policy_l2; 4134 break; 4135 } 4136 } 4137 4138 /* 4139 * Lookup the slave that corresponds to a qid 4140 */ 4141 static inline int bond_slave_override(struct bonding *bond, 4142 struct sk_buff *skb) 4143 { 4144 int i, res = 1; 4145 struct slave *slave = NULL; 4146 struct slave *check_slave; 4147 4148 if (!skb->queue_mapping) 4149 return 1; 4150 4151 /* Find out if any slaves have the same mapping as this skb. */ 4152 bond_for_each_slave(bond, check_slave, i) { 4153 if (check_slave->queue_id == skb->queue_mapping) { 4154 slave = check_slave; 4155 break; 4156 } 4157 } 4158 4159 /* If the slave isn't UP, use default transmit policy. */ 4160 if (slave && slave->queue_id && IS_UP(slave->dev) && 4161 (slave->link == BOND_LINK_UP)) { 4162 res = bond_dev_queue_xmit(bond, skb, slave->dev); 4163 } 4164 4165 return res; 4166 } 4167 4168 4169 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb) 4170 { 4171 /* 4172 * This helper function exists to help dev_pick_tx get the correct 4173 * destination queue. Using a helper function skips a call to 4174 * skb_tx_hash and will put the skbs in the queue we expect on their 4175 * way down to the bonding driver. 4176 */ 4177 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 4178 4179 /* 4180 * Save the original txq to restore before passing to the driver 4181 */ 4182 bond_queue_mapping(skb) = skb->queue_mapping; 4183 4184 if (unlikely(txq >= dev->real_num_tx_queues)) { 4185 do { 4186 txq -= dev->real_num_tx_queues; 4187 } while (txq >= dev->real_num_tx_queues); 4188 } 4189 return txq; 4190 } 4191 4192 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4193 { 4194 struct bonding *bond = netdev_priv(dev); 4195 4196 if (TX_QUEUE_OVERRIDE(bond->params.mode)) { 4197 if (!bond_slave_override(bond, skb)) 4198 return NETDEV_TX_OK; 4199 } 4200 4201 switch (bond->params.mode) { 4202 case BOND_MODE_ROUNDROBIN: 4203 return bond_xmit_roundrobin(skb, dev); 4204 case BOND_MODE_ACTIVEBACKUP: 4205 return bond_xmit_activebackup(skb, dev); 4206 case BOND_MODE_XOR: 4207 return bond_xmit_xor(skb, dev); 4208 case BOND_MODE_BROADCAST: 4209 return bond_xmit_broadcast(skb, dev); 4210 case BOND_MODE_8023AD: 4211 return bond_3ad_xmit_xor(skb, dev); 4212 case BOND_MODE_ALB: 4213 case BOND_MODE_TLB: 4214 return bond_alb_xmit(skb, dev); 4215 default: 4216 /* Should never happen, mode already checked */ 4217 pr_err("%s: Error: Unknown bonding mode %d\n", 4218 dev->name, bond->params.mode); 4219 WARN_ON_ONCE(1); 4220 dev_kfree_skb(skb); 4221 return NETDEV_TX_OK; 4222 } 4223 } 4224 4225 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4226 { 4227 struct bonding *bond = netdev_priv(dev); 4228 netdev_tx_t ret = NETDEV_TX_OK; 4229 4230 /* 4231 * If we risk deadlock from transmitting this in the 4232 * netpoll path, tell netpoll to queue the frame for later tx 4233 */ 4234 if (is_netpoll_tx_blocked(dev)) 4235 return NETDEV_TX_BUSY; 4236 4237 read_lock(&bond->lock); 4238 4239 if (bond->slave_cnt) 4240 ret = __bond_start_xmit(skb, dev); 4241 else 4242 dev_kfree_skb(skb); 4243 4244 read_unlock(&bond->lock); 4245 4246 return ret; 4247 } 4248 4249 /* 4250 * set bond mode specific net device operations 4251 */ 4252 void bond_set_mode_ops(struct bonding *bond, int mode) 4253 { 4254 struct net_device *bond_dev = bond->dev; 4255 4256 switch (mode) { 4257 case BOND_MODE_ROUNDROBIN: 4258 break; 4259 case BOND_MODE_ACTIVEBACKUP: 4260 break; 4261 case BOND_MODE_XOR: 4262 bond_set_xmit_hash_policy(bond); 4263 break; 4264 case BOND_MODE_BROADCAST: 4265 break; 4266 case BOND_MODE_8023AD: 4267 bond_set_xmit_hash_policy(bond); 4268 break; 4269 case BOND_MODE_ALB: 4270 /* FALLTHRU */ 4271 case BOND_MODE_TLB: 4272 break; 4273 default: 4274 /* Should never happen, mode already checked */ 4275 pr_err("%s: Error: Unknown bonding mode %d\n", 4276 bond_dev->name, mode); 4277 break; 4278 } 4279 } 4280 4281 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 4282 struct ethtool_drvinfo *drvinfo) 4283 { 4284 strncpy(drvinfo->driver, DRV_NAME, 32); 4285 strncpy(drvinfo->version, DRV_VERSION, 32); 4286 snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION); 4287 } 4288 4289 static const struct ethtool_ops bond_ethtool_ops = { 4290 .get_drvinfo = bond_ethtool_get_drvinfo, 4291 .get_link = ethtool_op_get_link, 4292 }; 4293 4294 static const struct net_device_ops bond_netdev_ops = { 4295 .ndo_init = bond_init, 4296 .ndo_uninit = bond_uninit, 4297 .ndo_open = bond_open, 4298 .ndo_stop = bond_close, 4299 .ndo_start_xmit = bond_start_xmit, 4300 .ndo_select_queue = bond_select_queue, 4301 .ndo_get_stats64 = bond_get_stats, 4302 .ndo_do_ioctl = bond_do_ioctl, 4303 .ndo_set_multicast_list = bond_set_multicast_list, 4304 .ndo_change_mtu = bond_change_mtu, 4305 .ndo_set_mac_address = bond_set_mac_address, 4306 .ndo_neigh_setup = bond_neigh_setup, 4307 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 4308 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 4309 #ifdef CONFIG_NET_POLL_CONTROLLER 4310 .ndo_netpoll_setup = bond_netpoll_setup, 4311 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 4312 .ndo_poll_controller = bond_poll_controller, 4313 #endif 4314 .ndo_add_slave = bond_enslave, 4315 .ndo_del_slave = bond_release, 4316 .ndo_fix_features = bond_fix_features, 4317 }; 4318 4319 static void bond_destructor(struct net_device *bond_dev) 4320 { 4321 struct bonding *bond = netdev_priv(bond_dev); 4322 if (bond->wq) 4323 destroy_workqueue(bond->wq); 4324 free_netdev(bond_dev); 4325 } 4326 4327 static void bond_setup(struct net_device *bond_dev) 4328 { 4329 struct bonding *bond = netdev_priv(bond_dev); 4330 4331 /* initialize rwlocks */ 4332 rwlock_init(&bond->lock); 4333 rwlock_init(&bond->curr_slave_lock); 4334 4335 bond->params = bonding_defaults; 4336 4337 /* Initialize pointers */ 4338 bond->dev = bond_dev; 4339 INIT_LIST_HEAD(&bond->vlan_list); 4340 4341 /* Initialize the device entry points */ 4342 ether_setup(bond_dev); 4343 bond_dev->netdev_ops = &bond_netdev_ops; 4344 bond_dev->ethtool_ops = &bond_ethtool_ops; 4345 bond_set_mode_ops(bond, bond->params.mode); 4346 4347 bond_dev->destructor = bond_destructor; 4348 4349 /* Initialize the device options */ 4350 bond_dev->tx_queue_len = 0; 4351 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST; 4352 bond_dev->priv_flags |= IFF_BONDING; 4353 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 4354 4355 /* At first, we block adding VLANs. That's the only way to 4356 * prevent problems that occur when adding VLANs over an 4357 * empty bond. The block will be removed once non-challenged 4358 * slaves are enslaved. 4359 */ 4360 bond_dev->features |= NETIF_F_VLAN_CHALLENGED; 4361 4362 /* don't acquire bond device's netif_tx_lock when 4363 * transmitting */ 4364 bond_dev->features |= NETIF_F_LLTX; 4365 4366 /* By default, we declare the bond to be fully 4367 * VLAN hardware accelerated capable. Special 4368 * care is taken in the various xmit functions 4369 * when there are slaves that are not hw accel 4370 * capable 4371 */ 4372 4373 bond_dev->hw_features = BOND_VLAN_FEATURES | 4374 NETIF_F_HW_VLAN_TX | 4375 NETIF_F_HW_VLAN_RX | 4376 NETIF_F_HW_VLAN_FILTER; 4377 4378 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_NO_CSUM); 4379 bond_dev->features |= bond_dev->hw_features; 4380 } 4381 4382 static void bond_work_cancel_all(struct bonding *bond) 4383 { 4384 write_lock_bh(&bond->lock); 4385 bond->kill_timers = 1; 4386 write_unlock_bh(&bond->lock); 4387 4388 if (bond->params.miimon && delayed_work_pending(&bond->mii_work)) 4389 cancel_delayed_work(&bond->mii_work); 4390 4391 if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work)) 4392 cancel_delayed_work(&bond->arp_work); 4393 4394 if (bond->params.mode == BOND_MODE_ALB && 4395 delayed_work_pending(&bond->alb_work)) 4396 cancel_delayed_work(&bond->alb_work); 4397 4398 if (bond->params.mode == BOND_MODE_8023AD && 4399 delayed_work_pending(&bond->ad_work)) 4400 cancel_delayed_work(&bond->ad_work); 4401 4402 if (delayed_work_pending(&bond->mcast_work)) 4403 cancel_delayed_work(&bond->mcast_work); 4404 } 4405 4406 /* 4407 * Destroy a bonding device. 4408 * Must be under rtnl_lock when this function is called. 4409 */ 4410 static void bond_uninit(struct net_device *bond_dev) 4411 { 4412 struct bonding *bond = netdev_priv(bond_dev); 4413 struct vlan_entry *vlan, *tmp; 4414 4415 bond_netpoll_cleanup(bond_dev); 4416 4417 /* Release the bonded slaves */ 4418 bond_release_all(bond_dev); 4419 4420 list_del(&bond->bond_list); 4421 4422 bond_work_cancel_all(bond); 4423 4424 bond_remove_proc_entry(bond); 4425 4426 bond_debug_unregister(bond); 4427 4428 __hw_addr_flush(&bond->mc_list); 4429 4430 list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) { 4431 list_del(&vlan->vlan_list); 4432 kfree(vlan); 4433 } 4434 } 4435 4436 /*------------------------- Module initialization ---------------------------*/ 4437 4438 /* 4439 * Convert string input module parms. Accept either the 4440 * number of the mode or its string name. A bit complicated because 4441 * some mode names are substrings of other names, and calls from sysfs 4442 * may have whitespace in the name (trailing newlines, for example). 4443 */ 4444 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl) 4445 { 4446 int modeint = -1, i, rv; 4447 char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, }; 4448 4449 for (p = (char *)buf; *p; p++) 4450 if (!(isdigit(*p) || isspace(*p))) 4451 break; 4452 4453 if (*p) 4454 rv = sscanf(buf, "%20s", modestr); 4455 else 4456 rv = sscanf(buf, "%d", &modeint); 4457 4458 if (!rv) 4459 return -1; 4460 4461 for (i = 0; tbl[i].modename; i++) { 4462 if (modeint == tbl[i].mode) 4463 return tbl[i].mode; 4464 if (strcmp(modestr, tbl[i].modename) == 0) 4465 return tbl[i].mode; 4466 } 4467 4468 return -1; 4469 } 4470 4471 static int bond_check_params(struct bond_params *params) 4472 { 4473 int arp_validate_value, fail_over_mac_value, primary_reselect_value; 4474 4475 /* 4476 * Convert string parameters. 4477 */ 4478 if (mode) { 4479 bond_mode = bond_parse_parm(mode, bond_mode_tbl); 4480 if (bond_mode == -1) { 4481 pr_err("Error: Invalid bonding mode \"%s\"\n", 4482 mode == NULL ? "NULL" : mode); 4483 return -EINVAL; 4484 } 4485 } 4486 4487 if (xmit_hash_policy) { 4488 if ((bond_mode != BOND_MODE_XOR) && 4489 (bond_mode != BOND_MODE_8023AD)) { 4490 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 4491 bond_mode_name(bond_mode)); 4492 } else { 4493 xmit_hashtype = bond_parse_parm(xmit_hash_policy, 4494 xmit_hashtype_tbl); 4495 if (xmit_hashtype == -1) { 4496 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 4497 xmit_hash_policy == NULL ? "NULL" : 4498 xmit_hash_policy); 4499 return -EINVAL; 4500 } 4501 } 4502 } 4503 4504 if (lacp_rate) { 4505 if (bond_mode != BOND_MODE_8023AD) { 4506 pr_info("lacp_rate param is irrelevant in mode %s\n", 4507 bond_mode_name(bond_mode)); 4508 } else { 4509 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl); 4510 if (lacp_fast == -1) { 4511 pr_err("Error: Invalid lacp rate \"%s\"\n", 4512 lacp_rate == NULL ? "NULL" : lacp_rate); 4513 return -EINVAL; 4514 } 4515 } 4516 } 4517 4518 if (ad_select) { 4519 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl); 4520 if (params->ad_select == -1) { 4521 pr_err("Error: Invalid ad_select \"%s\"\n", 4522 ad_select == NULL ? "NULL" : ad_select); 4523 return -EINVAL; 4524 } 4525 4526 if (bond_mode != BOND_MODE_8023AD) { 4527 pr_warning("ad_select param only affects 802.3ad mode\n"); 4528 } 4529 } else { 4530 params->ad_select = BOND_AD_STABLE; 4531 } 4532 4533 if (max_bonds < 0) { 4534 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 4535 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 4536 max_bonds = BOND_DEFAULT_MAX_BONDS; 4537 } 4538 4539 if (miimon < 0) { 4540 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n", 4541 miimon, INT_MAX, BOND_LINK_MON_INTERV); 4542 miimon = BOND_LINK_MON_INTERV; 4543 } 4544 4545 if (updelay < 0) { 4546 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4547 updelay, INT_MAX); 4548 updelay = 0; 4549 } 4550 4551 if (downdelay < 0) { 4552 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4553 downdelay, INT_MAX); 4554 downdelay = 0; 4555 } 4556 4557 if ((use_carrier != 0) && (use_carrier != 1)) { 4558 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 4559 use_carrier); 4560 use_carrier = 1; 4561 } 4562 4563 if (num_peer_notif < 0 || num_peer_notif > 255) { 4564 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 4565 num_peer_notif); 4566 num_peer_notif = 1; 4567 } 4568 4569 /* reset values for 802.3ad */ 4570 if (bond_mode == BOND_MODE_8023AD) { 4571 if (!miimon) { 4572 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"); 4573 pr_warning("Forcing miimon to 100msec\n"); 4574 miimon = 100; 4575 } 4576 } 4577 4578 if (tx_queues < 1 || tx_queues > 255) { 4579 pr_warning("Warning: tx_queues (%d) should be between " 4580 "1 and 255, resetting to %d\n", 4581 tx_queues, BOND_DEFAULT_TX_QUEUES); 4582 tx_queues = BOND_DEFAULT_TX_QUEUES; 4583 } 4584 4585 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 4586 pr_warning("Warning: all_slaves_active module parameter (%d), " 4587 "not of valid value (0/1), so it was set to " 4588 "0\n", all_slaves_active); 4589 all_slaves_active = 0; 4590 } 4591 4592 if (resend_igmp < 0 || resend_igmp > 255) { 4593 pr_warning("Warning: resend_igmp (%d) should be between " 4594 "0 and 255, resetting to %d\n", 4595 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 4596 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 4597 } 4598 4599 /* reset values for TLB/ALB */ 4600 if ((bond_mode == BOND_MODE_TLB) || 4601 (bond_mode == BOND_MODE_ALB)) { 4602 if (!miimon) { 4603 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"); 4604 pr_warning("Forcing miimon to 100msec\n"); 4605 miimon = 100; 4606 } 4607 } 4608 4609 if (bond_mode == BOND_MODE_ALB) { 4610 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", 4611 updelay); 4612 } 4613 4614 if (!miimon) { 4615 if (updelay || downdelay) { 4616 /* just warn the user the up/down delay will have 4617 * no effect since miimon is zero... 4618 */ 4619 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", 4620 updelay, downdelay); 4621 } 4622 } else { 4623 /* don't allow arp monitoring */ 4624 if (arp_interval) { 4625 pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 4626 miimon, arp_interval); 4627 arp_interval = 0; 4628 } 4629 4630 if ((updelay % miimon) != 0) { 4631 pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 4632 updelay, miimon, 4633 (updelay / miimon) * miimon); 4634 } 4635 4636 updelay /= miimon; 4637 4638 if ((downdelay % miimon) != 0) { 4639 pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 4640 downdelay, miimon, 4641 (downdelay / miimon) * miimon); 4642 } 4643 4644 downdelay /= miimon; 4645 } 4646 4647 if (arp_interval < 0) { 4648 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n", 4649 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV); 4650 arp_interval = BOND_LINK_ARP_INTERV; 4651 } 4652 4653 for (arp_ip_count = 0; 4654 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count]; 4655 arp_ip_count++) { 4656 /* not complete check, but should be good enough to 4657 catch mistakes */ 4658 if (!isdigit(arp_ip_target[arp_ip_count][0])) { 4659 pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 4660 arp_ip_target[arp_ip_count]); 4661 arp_interval = 0; 4662 } else { 4663 __be32 ip = in_aton(arp_ip_target[arp_ip_count]); 4664 arp_target[arp_ip_count] = ip; 4665 } 4666 } 4667 4668 if (arp_interval && !arp_ip_count) { 4669 /* don't allow arping if no arp_ip_target given... */ 4670 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 4671 arp_interval); 4672 arp_interval = 0; 4673 } 4674 4675 if (arp_validate) { 4676 if (bond_mode != BOND_MODE_ACTIVEBACKUP) { 4677 pr_err("arp_validate only supported in active-backup mode\n"); 4678 return -EINVAL; 4679 } 4680 if (!arp_interval) { 4681 pr_err("arp_validate requires arp_interval\n"); 4682 return -EINVAL; 4683 } 4684 4685 arp_validate_value = bond_parse_parm(arp_validate, 4686 arp_validate_tbl); 4687 if (arp_validate_value == -1) { 4688 pr_err("Error: invalid arp_validate \"%s\"\n", 4689 arp_validate == NULL ? "NULL" : arp_validate); 4690 return -EINVAL; 4691 } 4692 } else 4693 arp_validate_value = 0; 4694 4695 if (miimon) { 4696 pr_info("MII link monitoring set to %d ms\n", miimon); 4697 } else if (arp_interval) { 4698 int i; 4699 4700 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 4701 arp_interval, 4702 arp_validate_tbl[arp_validate_value].modename, 4703 arp_ip_count); 4704 4705 for (i = 0; i < arp_ip_count; i++) 4706 pr_info(" %s", arp_ip_target[i]); 4707 4708 pr_info("\n"); 4709 4710 } else if (max_bonds) { 4711 /* miimon and arp_interval not set, we need one so things 4712 * work as expected, see bonding.txt for details 4713 */ 4714 pr_debug("Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details.\n"); 4715 } 4716 4717 if (primary && !USES_PRIMARY(bond_mode)) { 4718 /* currently, using a primary only makes sense 4719 * in active backup, TLB or ALB modes 4720 */ 4721 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n", 4722 primary, bond_mode_name(bond_mode)); 4723 primary = NULL; 4724 } 4725 4726 if (primary && primary_reselect) { 4727 primary_reselect_value = bond_parse_parm(primary_reselect, 4728 pri_reselect_tbl); 4729 if (primary_reselect_value == -1) { 4730 pr_err("Error: Invalid primary_reselect \"%s\"\n", 4731 primary_reselect == 4732 NULL ? "NULL" : primary_reselect); 4733 return -EINVAL; 4734 } 4735 } else { 4736 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 4737 } 4738 4739 if (fail_over_mac) { 4740 fail_over_mac_value = bond_parse_parm(fail_over_mac, 4741 fail_over_mac_tbl); 4742 if (fail_over_mac_value == -1) { 4743 pr_err("Error: invalid fail_over_mac \"%s\"\n", 4744 arp_validate == NULL ? "NULL" : arp_validate); 4745 return -EINVAL; 4746 } 4747 4748 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 4749 pr_warning("Warning: fail_over_mac only affects active-backup mode.\n"); 4750 } else { 4751 fail_over_mac_value = BOND_FOM_NONE; 4752 } 4753 4754 /* fill params struct with the proper values */ 4755 params->mode = bond_mode; 4756 params->xmit_policy = xmit_hashtype; 4757 params->miimon = miimon; 4758 params->num_peer_notif = num_peer_notif; 4759 params->arp_interval = arp_interval; 4760 params->arp_validate = arp_validate_value; 4761 params->updelay = updelay; 4762 params->downdelay = downdelay; 4763 params->use_carrier = use_carrier; 4764 params->lacp_fast = lacp_fast; 4765 params->primary[0] = 0; 4766 params->primary_reselect = primary_reselect_value; 4767 params->fail_over_mac = fail_over_mac_value; 4768 params->tx_queues = tx_queues; 4769 params->all_slaves_active = all_slaves_active; 4770 params->resend_igmp = resend_igmp; 4771 params->min_links = min_links; 4772 4773 if (primary) { 4774 strncpy(params->primary, primary, IFNAMSIZ); 4775 params->primary[IFNAMSIZ - 1] = 0; 4776 } 4777 4778 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 4779 4780 return 0; 4781 } 4782 4783 static struct lock_class_key bonding_netdev_xmit_lock_key; 4784 static struct lock_class_key bonding_netdev_addr_lock_key; 4785 4786 static void bond_set_lockdep_class_one(struct net_device *dev, 4787 struct netdev_queue *txq, 4788 void *_unused) 4789 { 4790 lockdep_set_class(&txq->_xmit_lock, 4791 &bonding_netdev_xmit_lock_key); 4792 } 4793 4794 static void bond_set_lockdep_class(struct net_device *dev) 4795 { 4796 lockdep_set_class(&dev->addr_list_lock, 4797 &bonding_netdev_addr_lock_key); 4798 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL); 4799 } 4800 4801 /* 4802 * Called from registration process 4803 */ 4804 static int bond_init(struct net_device *bond_dev) 4805 { 4806 struct bonding *bond = netdev_priv(bond_dev); 4807 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 4808 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); 4809 4810 pr_debug("Begin bond_init for %s\n", bond_dev->name); 4811 4812 /* 4813 * Initialize locks that may be required during 4814 * en/deslave operations. All of the bond_open work 4815 * (of which this is part) should really be moved to 4816 * a phase prior to dev_open 4817 */ 4818 spin_lock_init(&(bond_info->tx_hashtbl_lock)); 4819 spin_lock_init(&(bond_info->rx_hashtbl_lock)); 4820 4821 bond->wq = create_singlethread_workqueue(bond_dev->name); 4822 if (!bond->wq) 4823 return -ENOMEM; 4824 4825 bond_set_lockdep_class(bond_dev); 4826 4827 bond_create_proc_entry(bond); 4828 list_add_tail(&bond->bond_list, &bn->dev_list); 4829 4830 bond_prepare_sysfs_group(bond); 4831 4832 bond_debug_register(bond); 4833 4834 __hw_addr_init(&bond->mc_list); 4835 return 0; 4836 } 4837 4838 static int bond_validate(struct nlattr *tb[], struct nlattr *data[]) 4839 { 4840 if (tb[IFLA_ADDRESS]) { 4841 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 4842 return -EINVAL; 4843 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 4844 return -EADDRNOTAVAIL; 4845 } 4846 return 0; 4847 } 4848 4849 static struct rtnl_link_ops bond_link_ops __read_mostly = { 4850 .kind = "bond", 4851 .priv_size = sizeof(struct bonding), 4852 .setup = bond_setup, 4853 .validate = bond_validate, 4854 }; 4855 4856 /* Create a new bond based on the specified name and bonding parameters. 4857 * If name is NULL, obtain a suitable "bond%d" name for us. 4858 * Caller must NOT hold rtnl_lock; we need to release it here before we 4859 * set up our sysfs entries. 4860 */ 4861 int bond_create(struct net *net, const char *name) 4862 { 4863 struct net_device *bond_dev; 4864 int res; 4865 4866 rtnl_lock(); 4867 4868 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 4869 name ? name : "bond%d", 4870 bond_setup, tx_queues); 4871 if (!bond_dev) { 4872 pr_err("%s: eek! can't alloc netdev!\n", name); 4873 rtnl_unlock(); 4874 return -ENOMEM; 4875 } 4876 4877 dev_net_set(bond_dev, net); 4878 bond_dev->rtnl_link_ops = &bond_link_ops; 4879 4880 res = register_netdevice(bond_dev); 4881 4882 netif_carrier_off(bond_dev); 4883 4884 rtnl_unlock(); 4885 if (res < 0) 4886 bond_destructor(bond_dev); 4887 return res; 4888 } 4889 4890 static int __net_init bond_net_init(struct net *net) 4891 { 4892 struct bond_net *bn = net_generic(net, bond_net_id); 4893 4894 bn->net = net; 4895 INIT_LIST_HEAD(&bn->dev_list); 4896 4897 bond_create_proc_dir(bn); 4898 4899 return 0; 4900 } 4901 4902 static void __net_exit bond_net_exit(struct net *net) 4903 { 4904 struct bond_net *bn = net_generic(net, bond_net_id); 4905 4906 bond_destroy_proc_dir(bn); 4907 } 4908 4909 static struct pernet_operations bond_net_ops = { 4910 .init = bond_net_init, 4911 .exit = bond_net_exit, 4912 .id = &bond_net_id, 4913 .size = sizeof(struct bond_net), 4914 }; 4915 4916 static int __init bonding_init(void) 4917 { 4918 int i; 4919 int res; 4920 4921 pr_info("%s", bond_version); 4922 4923 res = bond_check_params(&bonding_defaults); 4924 if (res) 4925 goto out; 4926 4927 res = register_pernet_subsys(&bond_net_ops); 4928 if (res) 4929 goto out; 4930 4931 res = rtnl_link_register(&bond_link_ops); 4932 if (res) 4933 goto err_link; 4934 4935 bond_create_debugfs(); 4936 4937 for (i = 0; i < max_bonds; i++) { 4938 res = bond_create(&init_net, NULL); 4939 if (res) 4940 goto err; 4941 } 4942 4943 res = bond_create_sysfs(); 4944 if (res) 4945 goto err; 4946 4947 register_netdevice_notifier(&bond_netdev_notifier); 4948 register_inetaddr_notifier(&bond_inetaddr_notifier); 4949 out: 4950 return res; 4951 err: 4952 rtnl_link_unregister(&bond_link_ops); 4953 err_link: 4954 unregister_pernet_subsys(&bond_net_ops); 4955 goto out; 4956 4957 } 4958 4959 static void __exit bonding_exit(void) 4960 { 4961 unregister_netdevice_notifier(&bond_netdev_notifier); 4962 unregister_inetaddr_notifier(&bond_inetaddr_notifier); 4963 4964 bond_destroy_sysfs(); 4965 bond_destroy_debugfs(); 4966 4967 rtnl_link_unregister(&bond_link_ops); 4968 unregister_pernet_subsys(&bond_net_ops); 4969 4970 #ifdef CONFIG_NET_POLL_CONTROLLER 4971 /* 4972 * Make sure we don't have an imbalance on our netpoll blocking 4973 */ 4974 WARN_ON(atomic_read(&netpoll_block_tx)); 4975 #endif 4976 } 4977 4978 module_init(bonding_init); 4979 module_exit(bonding_exit); 4980 MODULE_LICENSE("GPL"); 4981 MODULE_VERSION(DRV_VERSION); 4982 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION); 4983 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 4984 MODULE_ALIAS_RTNL_LINK("bond"); 4985