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