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/dma.h> 58 #include <linux/uaccess.h> 59 #include <linux/errno.h> 60 #include <linux/netdevice.h> 61 #include <linux/inetdevice.h> 62 #include <linux/igmp.h> 63 #include <linux/etherdevice.h> 64 #include <linux/skbuff.h> 65 #include <net/sock.h> 66 #include <linux/rtnetlink.h> 67 #include <linux/smp.h> 68 #include <linux/if_ether.h> 69 #include <net/arp.h> 70 #include <linux/mii.h> 71 #include <linux/ethtool.h> 72 #include <linux/if_vlan.h> 73 #include <linux/if_bonding.h> 74 #include <linux/jiffies.h> 75 #include <linux/preempt.h> 76 #include <net/route.h> 77 #include <net/net_namespace.h> 78 #include <net/netns/generic.h> 79 #include "bonding.h" 80 #include "bond_3ad.h" 81 #include "bond_alb.h" 82 83 /*---------------------------- Module parameters ----------------------------*/ 84 85 /* monitor all links that often (in milliseconds). <=0 disables monitoring */ 86 #define BOND_LINK_MON_INTERV 0 87 #define BOND_LINK_ARP_INTERV 0 88 89 static int max_bonds = BOND_DEFAULT_MAX_BONDS; 90 static int tx_queues = BOND_DEFAULT_TX_QUEUES; 91 static int num_peer_notif = 1; 92 static int miimon = BOND_LINK_MON_INTERV; 93 static int updelay; 94 static int downdelay; 95 static int use_carrier = 1; 96 static char *mode; 97 static char *primary; 98 static char *primary_reselect; 99 static char *lacp_rate; 100 static int min_links; 101 static char *ad_select; 102 static char *xmit_hash_policy; 103 static int arp_interval = BOND_LINK_ARP_INTERV; 104 static char *arp_ip_target[BOND_MAX_ARP_TARGETS]; 105 static char *arp_validate; 106 static char *fail_over_mac; 107 static int all_slaves_active = 0; 108 static struct bond_params bonding_defaults; 109 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP; 110 111 module_param(max_bonds, int, 0); 112 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices"); 113 module_param(tx_queues, int, 0); 114 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)"); 115 module_param_named(num_grat_arp, num_peer_notif, int, 0644); 116 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on " 117 "failover event (alias of num_unsol_na)"); 118 module_param_named(num_unsol_na, num_peer_notif, int, 0644); 119 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on " 120 "failover event (alias of num_grat_arp)"); 121 module_param(miimon, int, 0); 122 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds"); 123 module_param(updelay, int, 0); 124 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds"); 125 module_param(downdelay, int, 0); 126 MODULE_PARM_DESC(downdelay, "Delay before considering link down, " 127 "in milliseconds"); 128 module_param(use_carrier, int, 0); 129 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; " 130 "0 for off, 1 for on (default)"); 131 module_param(mode, charp, 0); 132 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, " 133 "1 for active-backup, 2 for balance-xor, " 134 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, " 135 "6 for balance-alb"); 136 module_param(primary, charp, 0); 137 MODULE_PARM_DESC(primary, "Primary network device to use"); 138 module_param(primary_reselect, charp, 0); 139 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave " 140 "once it comes up; " 141 "0 for always (default), " 142 "1 for only if speed of primary is " 143 "better, " 144 "2 for only on active slave " 145 "failure"); 146 module_param(lacp_rate, charp, 0); 147 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; " 148 "0 for slow, 1 for fast"); 149 module_param(ad_select, charp, 0); 150 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; " 151 "0 for stable (default), 1 for bandwidth, " 152 "2 for count"); 153 module_param(min_links, int, 0); 154 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier"); 155 156 module_param(xmit_hash_policy, charp, 0); 157 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; " 158 "0 for layer 2 (default), 1 for layer 3+4, " 159 "2 for layer 2+3"); 160 module_param(arp_interval, int, 0); 161 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds"); 162 module_param_array(arp_ip_target, charp, NULL, 0); 163 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form"); 164 module_param(arp_validate, charp, 0); 165 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; " 166 "0 for none (default), 1 for active, " 167 "2 for backup, 3 for all"); 168 module_param(fail_over_mac, charp, 0); 169 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to " 170 "the same MAC; 0 for none (default), " 171 "1 for active, 2 for follow"); 172 module_param(all_slaves_active, int, 0); 173 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface" 174 "by setting active flag for all slaves; " 175 "0 for never (default), 1 for always."); 176 module_param(resend_igmp, int, 0); 177 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on " 178 "link failure"); 179 180 /*----------------------------- Global variables ----------------------------*/ 181 182 #ifdef CONFIG_NET_POLL_CONTROLLER 183 atomic_t netpoll_block_tx = ATOMIC_INIT(0); 184 #endif 185 186 int bond_net_id __read_mostly; 187 188 static __be32 arp_target[BOND_MAX_ARP_TARGETS]; 189 static int arp_ip_count; 190 static int bond_mode = BOND_MODE_ROUNDROBIN; 191 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2; 192 static int lacp_fast; 193 194 const struct bond_parm_tbl bond_lacp_tbl[] = { 195 { "slow", AD_LACP_SLOW}, 196 { "fast", AD_LACP_FAST}, 197 { NULL, -1}, 198 }; 199 200 const struct bond_parm_tbl bond_mode_tbl[] = { 201 { "balance-rr", BOND_MODE_ROUNDROBIN}, 202 { "active-backup", BOND_MODE_ACTIVEBACKUP}, 203 { "balance-xor", BOND_MODE_XOR}, 204 { "broadcast", BOND_MODE_BROADCAST}, 205 { "802.3ad", BOND_MODE_8023AD}, 206 { "balance-tlb", BOND_MODE_TLB}, 207 { "balance-alb", BOND_MODE_ALB}, 208 { NULL, -1}, 209 }; 210 211 const struct bond_parm_tbl xmit_hashtype_tbl[] = { 212 { "layer2", BOND_XMIT_POLICY_LAYER2}, 213 { "layer3+4", BOND_XMIT_POLICY_LAYER34}, 214 { "layer2+3", BOND_XMIT_POLICY_LAYER23}, 215 { NULL, -1}, 216 }; 217 218 const struct bond_parm_tbl arp_validate_tbl[] = { 219 { "none", BOND_ARP_VALIDATE_NONE}, 220 { "active", BOND_ARP_VALIDATE_ACTIVE}, 221 { "backup", BOND_ARP_VALIDATE_BACKUP}, 222 { "all", BOND_ARP_VALIDATE_ALL}, 223 { NULL, -1}, 224 }; 225 226 const struct bond_parm_tbl fail_over_mac_tbl[] = { 227 { "none", BOND_FOM_NONE}, 228 { "active", BOND_FOM_ACTIVE}, 229 { "follow", BOND_FOM_FOLLOW}, 230 { NULL, -1}, 231 }; 232 233 const struct bond_parm_tbl pri_reselect_tbl[] = { 234 { "always", BOND_PRI_RESELECT_ALWAYS}, 235 { "better", BOND_PRI_RESELECT_BETTER}, 236 { "failure", BOND_PRI_RESELECT_FAILURE}, 237 { NULL, -1}, 238 }; 239 240 struct bond_parm_tbl ad_select_tbl[] = { 241 { "stable", BOND_AD_STABLE}, 242 { "bandwidth", BOND_AD_BANDWIDTH}, 243 { "count", BOND_AD_COUNT}, 244 { NULL, -1}, 245 }; 246 247 /*-------------------------- Forward declarations ---------------------------*/ 248 249 static int bond_init(struct net_device *bond_dev); 250 static void bond_uninit(struct net_device *bond_dev); 251 252 /*---------------------------- General routines -----------------------------*/ 253 254 const char *bond_mode_name(int mode) 255 { 256 static const char *names[] = { 257 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)", 258 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)", 259 [BOND_MODE_XOR] = "load balancing (xor)", 260 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)", 261 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation", 262 [BOND_MODE_TLB] = "transmit load balancing", 263 [BOND_MODE_ALB] = "adaptive load balancing", 264 }; 265 266 if (mode < 0 || mode > BOND_MODE_ALB) 267 return "unknown"; 268 269 return names[mode]; 270 } 271 272 /*---------------------------------- VLAN -----------------------------------*/ 273 274 /** 275 * bond_add_vlan - add a new vlan id on bond 276 * @bond: bond that got the notification 277 * @vlan_id: the vlan id to add 278 * 279 * Returns -ENOMEM if allocation failed. 280 */ 281 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id) 282 { 283 struct vlan_entry *vlan; 284 285 pr_debug("bond: %s, vlan id %d\n", 286 (bond ? bond->dev->name : "None"), vlan_id); 287 288 vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL); 289 if (!vlan) 290 return -ENOMEM; 291 292 INIT_LIST_HEAD(&vlan->vlan_list); 293 vlan->vlan_id = vlan_id; 294 295 write_lock_bh(&bond->lock); 296 297 list_add_tail(&vlan->vlan_list, &bond->vlan_list); 298 299 write_unlock_bh(&bond->lock); 300 301 pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name); 302 303 return 0; 304 } 305 306 /** 307 * bond_del_vlan - delete a vlan id from bond 308 * @bond: bond that got the notification 309 * @vlan_id: the vlan id to delete 310 * 311 * returns -ENODEV if @vlan_id was not found in @bond. 312 */ 313 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id) 314 { 315 struct vlan_entry *vlan; 316 int res = -ENODEV; 317 318 pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id); 319 320 block_netpoll_tx(); 321 write_lock_bh(&bond->lock); 322 323 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 324 if (vlan->vlan_id == vlan_id) { 325 list_del(&vlan->vlan_list); 326 327 if (bond_is_lb(bond)) 328 bond_alb_clear_vlan(bond, vlan_id); 329 330 pr_debug("removed VLAN ID %d from bond %s\n", 331 vlan_id, bond->dev->name); 332 333 kfree(vlan); 334 335 res = 0; 336 goto out; 337 } 338 } 339 340 pr_debug("couldn't find VLAN ID %d in bond %s\n", 341 vlan_id, bond->dev->name); 342 343 out: 344 write_unlock_bh(&bond->lock); 345 unblock_netpoll_tx(); 346 return res; 347 } 348 349 /** 350 * bond_next_vlan - safely skip to the next item in the vlans list. 351 * @bond: the bond we're working on 352 * @curr: item we're advancing from 353 * 354 * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL, 355 * or @curr->next otherwise (even if it is @curr itself again). 356 * 357 * Caller must hold bond->lock 358 */ 359 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr) 360 { 361 struct vlan_entry *next, *last; 362 363 if (list_empty(&bond->vlan_list)) 364 return NULL; 365 366 if (!curr) { 367 next = list_entry(bond->vlan_list.next, 368 struct vlan_entry, vlan_list); 369 } else { 370 last = list_entry(bond->vlan_list.prev, 371 struct vlan_entry, vlan_list); 372 if (last == curr) { 373 next = list_entry(bond->vlan_list.next, 374 struct vlan_entry, vlan_list); 375 } else { 376 next = list_entry(curr->vlan_list.next, 377 struct vlan_entry, vlan_list); 378 } 379 } 380 381 return next; 382 } 383 384 #define bond_queue_mapping(skb) (*(u16 *)((skb)->cb)) 385 386 /** 387 * bond_dev_queue_xmit - Prepare skb for xmit. 388 * 389 * @bond: bond device that got this skb for tx. 390 * @skb: hw accel VLAN tagged skb to transmit 391 * @slave_dev: slave that is supposed to xmit this skbuff 392 */ 393 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, 394 struct net_device *slave_dev) 395 { 396 skb->dev = slave_dev; 397 398 skb->queue_mapping = bond_queue_mapping(skb); 399 400 if (unlikely(netpoll_tx_running(slave_dev))) 401 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb); 402 else 403 dev_queue_xmit(skb); 404 405 return 0; 406 } 407 408 /* 409 * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid, 410 * We don't protect the slave list iteration with a lock because: 411 * a. This operation is performed in IOCTL context, 412 * b. The operation is protected by the RTNL semaphore in the 8021q code, 413 * c. Holding a lock with BH disabled while directly calling a base driver 414 * entry point is generally a BAD idea. 415 * 416 * The design of synchronization/protection for this operation in the 8021q 417 * module is good for one or more VLAN devices over a single physical device 418 * and cannot be extended for a teaming solution like bonding, so there is a 419 * potential race condition here where a net device from the vlan group might 420 * be referenced (either by a base driver or the 8021q code) while it is being 421 * removed from the system. However, it turns out we're not making matters 422 * worse, and if it works for regular VLAN usage it will work here too. 423 */ 424 425 /** 426 * bond_vlan_rx_add_vid - Propagates adding an id to slaves 427 * @bond_dev: bonding net device that got called 428 * @vid: vlan id being added 429 */ 430 static int bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid) 431 { 432 struct bonding *bond = netdev_priv(bond_dev); 433 struct slave *slave, *stop_at; 434 int i, res; 435 436 bond_for_each_slave(bond, slave, i) { 437 res = vlan_vid_add(slave->dev, vid); 438 if (res) 439 goto unwind; 440 } 441 442 res = bond_add_vlan(bond, vid); 443 if (res) { 444 pr_err("%s: Error: Failed to add vlan id %d\n", 445 bond_dev->name, vid); 446 return res; 447 } 448 449 return 0; 450 451 unwind: 452 /* unwind from head to the slave that failed */ 453 stop_at = slave; 454 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) 455 vlan_vid_del(slave->dev, vid); 456 457 return res; 458 } 459 460 /** 461 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves 462 * @bond_dev: bonding net device that got called 463 * @vid: vlan id being removed 464 */ 465 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid) 466 { 467 struct bonding *bond = netdev_priv(bond_dev); 468 struct slave *slave; 469 int i, res; 470 471 bond_for_each_slave(bond, slave, i) 472 vlan_vid_del(slave->dev, vid); 473 474 res = bond_del_vlan(bond, vid); 475 if (res) { 476 pr_err("%s: Error: Failed to remove vlan id %d\n", 477 bond_dev->name, vid); 478 return res; 479 } 480 481 return 0; 482 } 483 484 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev) 485 { 486 struct vlan_entry *vlan; 487 int res; 488 489 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 490 res = vlan_vid_add(slave_dev, vlan->vlan_id); 491 if (res) 492 pr_warning("%s: Failed to add vlan id %d to device %s\n", 493 bond->dev->name, vlan->vlan_id, 494 slave_dev->name); 495 } 496 } 497 498 static void bond_del_vlans_from_slave(struct bonding *bond, 499 struct net_device *slave_dev) 500 { 501 struct vlan_entry *vlan; 502 503 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 504 if (!vlan->vlan_id) 505 continue; 506 vlan_vid_del(slave_dev, vlan->vlan_id); 507 } 508 } 509 510 /*------------------------------- Link status -------------------------------*/ 511 512 /* 513 * Set the carrier state for the master according to the state of its 514 * slaves. If any slaves are up, the master is up. In 802.3ad mode, 515 * do special 802.3ad magic. 516 * 517 * Returns zero if carrier state does not change, nonzero if it does. 518 */ 519 static int bond_set_carrier(struct bonding *bond) 520 { 521 struct slave *slave; 522 int i; 523 524 if (bond->slave_cnt == 0) 525 goto down; 526 527 if (bond->params.mode == BOND_MODE_8023AD) 528 return bond_3ad_set_carrier(bond); 529 530 bond_for_each_slave(bond, slave, i) { 531 if (slave->link == BOND_LINK_UP) { 532 if (!netif_carrier_ok(bond->dev)) { 533 netif_carrier_on(bond->dev); 534 return 1; 535 } 536 return 0; 537 } 538 } 539 540 down: 541 if (netif_carrier_ok(bond->dev)) { 542 netif_carrier_off(bond->dev); 543 return 1; 544 } 545 return 0; 546 } 547 548 /* 549 * Get link speed and duplex from the slave's base driver 550 * using ethtool. If for some reason the call fails or the 551 * values are invalid, set speed and duplex to -1, 552 * and return error. 553 */ 554 static int bond_update_speed_duplex(struct slave *slave) 555 { 556 struct net_device *slave_dev = slave->dev; 557 struct ethtool_cmd ecmd; 558 u32 slave_speed; 559 int res; 560 561 slave->speed = SPEED_UNKNOWN; 562 slave->duplex = DUPLEX_UNKNOWN; 563 564 res = __ethtool_get_settings(slave_dev, &ecmd); 565 if (res < 0) 566 return -1; 567 568 slave_speed = ethtool_cmd_speed(&ecmd); 569 if (slave_speed == 0 || slave_speed == ((__u32) -1)) 570 return -1; 571 572 switch (ecmd.duplex) { 573 case DUPLEX_FULL: 574 case DUPLEX_HALF: 575 break; 576 default: 577 return -1; 578 } 579 580 slave->speed = slave_speed; 581 slave->duplex = ecmd.duplex; 582 583 return 0; 584 } 585 586 /* 587 * if <dev> supports MII link status reporting, check its link status. 588 * 589 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), 590 * depending upon the setting of the use_carrier parameter. 591 * 592 * Return either BMSR_LSTATUS, meaning that the link is up (or we 593 * can't tell and just pretend it is), or 0, meaning that the link is 594 * down. 595 * 596 * If reporting is non-zero, instead of faking link up, return -1 if 597 * both ETHTOOL and MII ioctls fail (meaning the device does not 598 * support them). If use_carrier is set, return whatever it says. 599 * It'd be nice if there was a good way to tell if a driver supports 600 * netif_carrier, but there really isn't. 601 */ 602 static int bond_check_dev_link(struct bonding *bond, 603 struct net_device *slave_dev, int reporting) 604 { 605 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 606 int (*ioctl)(struct net_device *, struct ifreq *, int); 607 struct ifreq ifr; 608 struct mii_ioctl_data *mii; 609 610 if (!reporting && !netif_running(slave_dev)) 611 return 0; 612 613 if (bond->params.use_carrier) 614 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; 615 616 /* Try to get link status using Ethtool first. */ 617 if (slave_dev->ethtool_ops) { 618 if (slave_dev->ethtool_ops->get_link) { 619 u32 link; 620 621 link = slave_dev->ethtool_ops->get_link(slave_dev); 622 623 return link ? BMSR_LSTATUS : 0; 624 } 625 } 626 627 /* Ethtool can't be used, fallback to MII ioctls. */ 628 ioctl = slave_ops->ndo_do_ioctl; 629 if (ioctl) { 630 /* TODO: set pointer to correct ioctl on a per team member */ 631 /* bases to make this more efficient. that is, once */ 632 /* we determine the correct ioctl, we will always */ 633 /* call it and not the others for that team */ 634 /* member. */ 635 636 /* 637 * We cannot assume that SIOCGMIIPHY will also read a 638 * register; not all network drivers (e.g., e100) 639 * support that. 640 */ 641 642 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ 643 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ); 644 mii = if_mii(&ifr); 645 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) { 646 mii->reg_num = MII_BMSR; 647 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) 648 return mii->val_out & BMSR_LSTATUS; 649 } 650 } 651 652 /* 653 * If reporting, report that either there's no dev->do_ioctl, 654 * or both SIOCGMIIREG and get_link failed (meaning that we 655 * cannot report link status). If not reporting, pretend 656 * we're ok. 657 */ 658 return reporting ? -1 : BMSR_LSTATUS; 659 } 660 661 /*----------------------------- Multicast list ------------------------------*/ 662 663 /* 664 * Push the promiscuity flag down to appropriate slaves 665 */ 666 static int bond_set_promiscuity(struct bonding *bond, int inc) 667 { 668 int err = 0; 669 if (USES_PRIMARY(bond->params.mode)) { 670 /* write lock already acquired */ 671 if (bond->curr_active_slave) { 672 err = dev_set_promiscuity(bond->curr_active_slave->dev, 673 inc); 674 } 675 } else { 676 struct slave *slave; 677 int i; 678 bond_for_each_slave(bond, slave, i) { 679 err = dev_set_promiscuity(slave->dev, inc); 680 if (err) 681 return err; 682 } 683 } 684 return err; 685 } 686 687 /* 688 * Push the allmulti flag down to all slaves 689 */ 690 static int bond_set_allmulti(struct bonding *bond, int inc) 691 { 692 int err = 0; 693 if (USES_PRIMARY(bond->params.mode)) { 694 /* write lock already acquired */ 695 if (bond->curr_active_slave) { 696 err = dev_set_allmulti(bond->curr_active_slave->dev, 697 inc); 698 } 699 } else { 700 struct slave *slave; 701 int i; 702 bond_for_each_slave(bond, slave, i) { 703 err = dev_set_allmulti(slave->dev, inc); 704 if (err) 705 return err; 706 } 707 } 708 return err; 709 } 710 711 /* 712 * Add a Multicast address to slaves 713 * according to mode 714 */ 715 static void bond_mc_add(struct bonding *bond, void *addr) 716 { 717 if (USES_PRIMARY(bond->params.mode)) { 718 /* write lock already acquired */ 719 if (bond->curr_active_slave) 720 dev_mc_add(bond->curr_active_slave->dev, addr); 721 } else { 722 struct slave *slave; 723 int i; 724 725 bond_for_each_slave(bond, slave, i) 726 dev_mc_add(slave->dev, addr); 727 } 728 } 729 730 /* 731 * Remove a multicast address from slave 732 * according to mode 733 */ 734 static void bond_mc_del(struct bonding *bond, void *addr) 735 { 736 if (USES_PRIMARY(bond->params.mode)) { 737 /* write lock already acquired */ 738 if (bond->curr_active_slave) 739 dev_mc_del(bond->curr_active_slave->dev, addr); 740 } else { 741 struct slave *slave; 742 int i; 743 bond_for_each_slave(bond, slave, i) { 744 dev_mc_del(slave->dev, addr); 745 } 746 } 747 } 748 749 750 static void __bond_resend_igmp_join_requests(struct net_device *dev) 751 { 752 struct in_device *in_dev; 753 754 rcu_read_lock(); 755 in_dev = __in_dev_get_rcu(dev); 756 if (in_dev) 757 ip_mc_rejoin_groups(in_dev); 758 rcu_read_unlock(); 759 } 760 761 /* 762 * Retrieve the list of registered multicast addresses for the bonding 763 * device and retransmit an IGMP JOIN request to the current active 764 * slave. 765 */ 766 static void bond_resend_igmp_join_requests(struct bonding *bond) 767 { 768 struct net_device *bond_dev, *vlan_dev, *master_dev; 769 struct vlan_entry *vlan; 770 771 read_lock(&bond->lock); 772 773 bond_dev = bond->dev; 774 775 /* rejoin all groups on bond device */ 776 __bond_resend_igmp_join_requests(bond_dev); 777 778 /* 779 * if bond is enslaved to a bridge, 780 * then rejoin all groups on its master 781 */ 782 master_dev = bond_dev->master; 783 if (master_dev) 784 if ((master_dev->priv_flags & IFF_EBRIDGE) 785 && (bond_dev->priv_flags & IFF_BRIDGE_PORT)) 786 __bond_resend_igmp_join_requests(master_dev); 787 788 /* rejoin all groups on vlan devices */ 789 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 790 rcu_read_lock(); 791 vlan_dev = __vlan_find_dev_deep(bond_dev, 792 vlan->vlan_id); 793 rcu_read_unlock(); 794 if (vlan_dev) 795 __bond_resend_igmp_join_requests(vlan_dev); 796 } 797 798 if (--bond->igmp_retrans > 0) 799 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); 800 801 read_unlock(&bond->lock); 802 } 803 804 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work) 805 { 806 struct bonding *bond = container_of(work, struct bonding, 807 mcast_work.work); 808 bond_resend_igmp_join_requests(bond); 809 } 810 811 /* 812 * flush all members of flush->mc_list from device dev->mc_list 813 */ 814 static void bond_mc_list_flush(struct net_device *bond_dev, 815 struct net_device *slave_dev) 816 { 817 struct bonding *bond = netdev_priv(bond_dev); 818 struct netdev_hw_addr *ha; 819 820 netdev_for_each_mc_addr(ha, bond_dev) 821 dev_mc_del(slave_dev, ha->addr); 822 823 if (bond->params.mode == BOND_MODE_8023AD) { 824 /* del lacpdu mc addr from mc list */ 825 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 826 827 dev_mc_del(slave_dev, lacpdu_multicast); 828 } 829 } 830 831 /*--------------------------- Active slave change ---------------------------*/ 832 833 /* 834 * Update the mc list and multicast-related flags for the new and 835 * old active slaves (if any) according to the multicast mode, and 836 * promiscuous flags unconditionally. 837 */ 838 static void bond_mc_swap(struct bonding *bond, struct slave *new_active, 839 struct slave *old_active) 840 { 841 struct netdev_hw_addr *ha; 842 843 if (!USES_PRIMARY(bond->params.mode)) 844 /* nothing to do - mc list is already up-to-date on 845 * all slaves 846 */ 847 return; 848 849 if (old_active) { 850 if (bond->dev->flags & IFF_PROMISC) 851 dev_set_promiscuity(old_active->dev, -1); 852 853 if (bond->dev->flags & IFF_ALLMULTI) 854 dev_set_allmulti(old_active->dev, -1); 855 856 netdev_for_each_mc_addr(ha, bond->dev) 857 dev_mc_del(old_active->dev, ha->addr); 858 } 859 860 if (new_active) { 861 /* FIXME: Signal errors upstream. */ 862 if (bond->dev->flags & IFF_PROMISC) 863 dev_set_promiscuity(new_active->dev, 1); 864 865 if (bond->dev->flags & IFF_ALLMULTI) 866 dev_set_allmulti(new_active->dev, 1); 867 868 netdev_for_each_mc_addr(ha, bond->dev) 869 dev_mc_add(new_active->dev, ha->addr); 870 } 871 } 872 873 /* 874 * bond_do_fail_over_mac 875 * 876 * Perform special MAC address swapping for fail_over_mac settings 877 * 878 * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh. 879 */ 880 static void bond_do_fail_over_mac(struct bonding *bond, 881 struct slave *new_active, 882 struct slave *old_active) 883 __releases(&bond->curr_slave_lock) 884 __releases(&bond->lock) 885 __acquires(&bond->lock) 886 __acquires(&bond->curr_slave_lock) 887 { 888 u8 tmp_mac[ETH_ALEN]; 889 struct sockaddr saddr; 890 int rv; 891 892 switch (bond->params.fail_over_mac) { 893 case BOND_FOM_ACTIVE: 894 if (new_active) { 895 memcpy(bond->dev->dev_addr, new_active->dev->dev_addr, 896 new_active->dev->addr_len); 897 write_unlock_bh(&bond->curr_slave_lock); 898 read_unlock(&bond->lock); 899 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 900 read_lock(&bond->lock); 901 write_lock_bh(&bond->curr_slave_lock); 902 } 903 break; 904 case BOND_FOM_FOLLOW: 905 /* 906 * if new_active && old_active, swap them 907 * if just old_active, do nothing (going to no active slave) 908 * if just new_active, set new_active to bond's MAC 909 */ 910 if (!new_active) 911 return; 912 913 write_unlock_bh(&bond->curr_slave_lock); 914 read_unlock(&bond->lock); 915 916 if (old_active) { 917 memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN); 918 memcpy(saddr.sa_data, old_active->dev->dev_addr, 919 ETH_ALEN); 920 saddr.sa_family = new_active->dev->type; 921 } else { 922 memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN); 923 saddr.sa_family = bond->dev->type; 924 } 925 926 rv = dev_set_mac_address(new_active->dev, &saddr); 927 if (rv) { 928 pr_err("%s: Error %d setting MAC of slave %s\n", 929 bond->dev->name, -rv, new_active->dev->name); 930 goto out; 931 } 932 933 if (!old_active) 934 goto out; 935 936 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN); 937 saddr.sa_family = old_active->dev->type; 938 939 rv = dev_set_mac_address(old_active->dev, &saddr); 940 if (rv) 941 pr_err("%s: Error %d setting MAC of slave %s\n", 942 bond->dev->name, -rv, new_active->dev->name); 943 out: 944 read_lock(&bond->lock); 945 write_lock_bh(&bond->curr_slave_lock); 946 break; 947 default: 948 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n", 949 bond->dev->name, bond->params.fail_over_mac); 950 break; 951 } 952 953 } 954 955 static bool bond_should_change_active(struct bonding *bond) 956 { 957 struct slave *prim = bond->primary_slave; 958 struct slave *curr = bond->curr_active_slave; 959 960 if (!prim || !curr || curr->link != BOND_LINK_UP) 961 return true; 962 if (bond->force_primary) { 963 bond->force_primary = false; 964 return true; 965 } 966 if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER && 967 (prim->speed < curr->speed || 968 (prim->speed == curr->speed && prim->duplex <= curr->duplex))) 969 return false; 970 if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE) 971 return false; 972 return true; 973 } 974 975 /** 976 * find_best_interface - select the best available slave to be the active one 977 * @bond: our bonding struct 978 * 979 * Warning: Caller must hold curr_slave_lock for writing. 980 */ 981 static struct slave *bond_find_best_slave(struct bonding *bond) 982 { 983 struct slave *new_active, *old_active; 984 struct slave *bestslave = NULL; 985 int mintime = bond->params.updelay; 986 int i; 987 988 new_active = bond->curr_active_slave; 989 990 if (!new_active) { /* there were no active slaves left */ 991 if (bond->slave_cnt > 0) /* found one slave */ 992 new_active = bond->first_slave; 993 else 994 return NULL; /* still no slave, return NULL */ 995 } 996 997 if ((bond->primary_slave) && 998 bond->primary_slave->link == BOND_LINK_UP && 999 bond_should_change_active(bond)) { 1000 new_active = bond->primary_slave; 1001 } 1002 1003 /* remember where to stop iterating over the slaves */ 1004 old_active = new_active; 1005 1006 bond_for_each_slave_from(bond, new_active, i, old_active) { 1007 if (new_active->link == BOND_LINK_UP) { 1008 return new_active; 1009 } else if (new_active->link == BOND_LINK_BACK && 1010 IS_UP(new_active->dev)) { 1011 /* link up, but waiting for stabilization */ 1012 if (new_active->delay < mintime) { 1013 mintime = new_active->delay; 1014 bestslave = new_active; 1015 } 1016 } 1017 } 1018 1019 return bestslave; 1020 } 1021 1022 static bool bond_should_notify_peers(struct bonding *bond) 1023 { 1024 struct slave *slave = bond->curr_active_slave; 1025 1026 pr_debug("bond_should_notify_peers: bond %s slave %s\n", 1027 bond->dev->name, slave ? slave->dev->name : "NULL"); 1028 1029 if (!slave || !bond->send_peer_notif || 1030 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) 1031 return false; 1032 1033 bond->send_peer_notif--; 1034 return true; 1035 } 1036 1037 /** 1038 * change_active_interface - change the active slave into the specified one 1039 * @bond: our bonding struct 1040 * @new: the new slave to make the active one 1041 * 1042 * Set the new slave to the bond's settings and unset them on the old 1043 * curr_active_slave. 1044 * Setting include flags, mc-list, promiscuity, allmulti, etc. 1045 * 1046 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, 1047 * because it is apparently the best available slave we have, even though its 1048 * updelay hasn't timed out yet. 1049 * 1050 * If new_active is not NULL, caller must hold bond->lock for read and 1051 * curr_slave_lock for write_bh. 1052 */ 1053 void bond_change_active_slave(struct bonding *bond, struct slave *new_active) 1054 { 1055 struct slave *old_active = bond->curr_active_slave; 1056 1057 if (old_active == new_active) 1058 return; 1059 1060 if (new_active) { 1061 new_active->jiffies = jiffies; 1062 1063 if (new_active->link == BOND_LINK_BACK) { 1064 if (USES_PRIMARY(bond->params.mode)) { 1065 pr_info("%s: making interface %s the new active one %d ms earlier.\n", 1066 bond->dev->name, new_active->dev->name, 1067 (bond->params.updelay - new_active->delay) * bond->params.miimon); 1068 } 1069 1070 new_active->delay = 0; 1071 new_active->link = BOND_LINK_UP; 1072 1073 if (bond->params.mode == BOND_MODE_8023AD) 1074 bond_3ad_handle_link_change(new_active, BOND_LINK_UP); 1075 1076 if (bond_is_lb(bond)) 1077 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); 1078 } else { 1079 if (USES_PRIMARY(bond->params.mode)) { 1080 pr_info("%s: making interface %s the new active one.\n", 1081 bond->dev->name, new_active->dev->name); 1082 } 1083 } 1084 } 1085 1086 if (USES_PRIMARY(bond->params.mode)) 1087 bond_mc_swap(bond, new_active, old_active); 1088 1089 if (bond_is_lb(bond)) { 1090 bond_alb_handle_active_change(bond, new_active); 1091 if (old_active) 1092 bond_set_slave_inactive_flags(old_active); 1093 if (new_active) 1094 bond_set_slave_active_flags(new_active); 1095 } else { 1096 bond->curr_active_slave = new_active; 1097 } 1098 1099 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) { 1100 if (old_active) 1101 bond_set_slave_inactive_flags(old_active); 1102 1103 if (new_active) { 1104 bool should_notify_peers = false; 1105 1106 bond_set_slave_active_flags(new_active); 1107 1108 if (bond->params.fail_over_mac) 1109 bond_do_fail_over_mac(bond, new_active, 1110 old_active); 1111 1112 if (netif_running(bond->dev)) { 1113 bond->send_peer_notif = 1114 bond->params.num_peer_notif; 1115 should_notify_peers = 1116 bond_should_notify_peers(bond); 1117 } 1118 1119 write_unlock_bh(&bond->curr_slave_lock); 1120 read_unlock(&bond->lock); 1121 1122 netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER); 1123 if (should_notify_peers) 1124 netdev_bonding_change(bond->dev, 1125 NETDEV_NOTIFY_PEERS); 1126 1127 read_lock(&bond->lock); 1128 write_lock_bh(&bond->curr_slave_lock); 1129 } 1130 } 1131 1132 /* resend IGMP joins since active slave has changed or 1133 * all were sent on curr_active_slave. 1134 * resend only if bond is brought up with the affected 1135 * bonding modes and the retransmission is enabled */ 1136 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && 1137 ((USES_PRIMARY(bond->params.mode) && new_active) || 1138 bond->params.mode == BOND_MODE_ROUNDROBIN)) { 1139 bond->igmp_retrans = bond->params.resend_igmp; 1140 queue_delayed_work(bond->wq, &bond->mcast_work, 0); 1141 } 1142 } 1143 1144 /** 1145 * bond_select_active_slave - select a new active slave, if needed 1146 * @bond: our bonding struct 1147 * 1148 * This functions should be called when one of the following occurs: 1149 * - The old curr_active_slave has been released or lost its link. 1150 * - The primary_slave has got its link back. 1151 * - A slave has got its link back and there's no old curr_active_slave. 1152 * 1153 * Caller must hold bond->lock for read and curr_slave_lock for write_bh. 1154 */ 1155 void bond_select_active_slave(struct bonding *bond) 1156 { 1157 struct slave *best_slave; 1158 int rv; 1159 1160 best_slave = bond_find_best_slave(bond); 1161 if (best_slave != bond->curr_active_slave) { 1162 bond_change_active_slave(bond, best_slave); 1163 rv = bond_set_carrier(bond); 1164 if (!rv) 1165 return; 1166 1167 if (netif_carrier_ok(bond->dev)) { 1168 pr_info("%s: first active interface up!\n", 1169 bond->dev->name); 1170 } else { 1171 pr_info("%s: now running without any active interface !\n", 1172 bond->dev->name); 1173 } 1174 } 1175 } 1176 1177 /*--------------------------- slave list handling ---------------------------*/ 1178 1179 /* 1180 * This function attaches the slave to the end of list. 1181 * 1182 * bond->lock held for writing by caller. 1183 */ 1184 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave) 1185 { 1186 if (bond->first_slave == NULL) { /* attaching the first slave */ 1187 new_slave->next = new_slave; 1188 new_slave->prev = new_slave; 1189 bond->first_slave = new_slave; 1190 } else { 1191 new_slave->next = bond->first_slave; 1192 new_slave->prev = bond->first_slave->prev; 1193 new_slave->next->prev = new_slave; 1194 new_slave->prev->next = new_slave; 1195 } 1196 1197 bond->slave_cnt++; 1198 } 1199 1200 /* 1201 * This function detaches the slave from the list. 1202 * WARNING: no check is made to verify if the slave effectively 1203 * belongs to <bond>. 1204 * Nothing is freed on return, structures are just unchained. 1205 * If any slave pointer in bond was pointing to <slave>, 1206 * it should be changed by the calling function. 1207 * 1208 * bond->lock held for writing by caller. 1209 */ 1210 static void bond_detach_slave(struct bonding *bond, struct slave *slave) 1211 { 1212 if (slave->next) 1213 slave->next->prev = slave->prev; 1214 1215 if (slave->prev) 1216 slave->prev->next = slave->next; 1217 1218 if (bond->first_slave == slave) { /* slave is the first slave */ 1219 if (bond->slave_cnt > 1) { /* there are more slave */ 1220 bond->first_slave = slave->next; 1221 } else { 1222 bond->first_slave = NULL; /* slave was the last one */ 1223 } 1224 } 1225 1226 slave->next = NULL; 1227 slave->prev = NULL; 1228 bond->slave_cnt--; 1229 } 1230 1231 #ifdef CONFIG_NET_POLL_CONTROLLER 1232 static inline int slave_enable_netpoll(struct slave *slave) 1233 { 1234 struct netpoll *np; 1235 int err = 0; 1236 1237 np = kzalloc(sizeof(*np), GFP_KERNEL); 1238 err = -ENOMEM; 1239 if (!np) 1240 goto out; 1241 1242 np->dev = slave->dev; 1243 strlcpy(np->dev_name, slave->dev->name, IFNAMSIZ); 1244 err = __netpoll_setup(np); 1245 if (err) { 1246 kfree(np); 1247 goto out; 1248 } 1249 slave->np = np; 1250 out: 1251 return err; 1252 } 1253 static inline void slave_disable_netpoll(struct slave *slave) 1254 { 1255 struct netpoll *np = slave->np; 1256 1257 if (!np) 1258 return; 1259 1260 slave->np = NULL; 1261 synchronize_rcu_bh(); 1262 __netpoll_cleanup(np); 1263 kfree(np); 1264 } 1265 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev) 1266 { 1267 if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL) 1268 return false; 1269 if (!slave_dev->netdev_ops->ndo_poll_controller) 1270 return false; 1271 return true; 1272 } 1273 1274 static void bond_poll_controller(struct net_device *bond_dev) 1275 { 1276 } 1277 1278 static void __bond_netpoll_cleanup(struct bonding *bond) 1279 { 1280 struct slave *slave; 1281 int i; 1282 1283 bond_for_each_slave(bond, slave, i) 1284 if (IS_UP(slave->dev)) 1285 slave_disable_netpoll(slave); 1286 } 1287 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1288 { 1289 struct bonding *bond = netdev_priv(bond_dev); 1290 1291 read_lock(&bond->lock); 1292 __bond_netpoll_cleanup(bond); 1293 read_unlock(&bond->lock); 1294 } 1295 1296 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) 1297 { 1298 struct bonding *bond = netdev_priv(dev); 1299 struct slave *slave; 1300 int i, err = 0; 1301 1302 read_lock(&bond->lock); 1303 bond_for_each_slave(bond, slave, i) { 1304 err = slave_enable_netpoll(slave); 1305 if (err) { 1306 __bond_netpoll_cleanup(bond); 1307 break; 1308 } 1309 } 1310 read_unlock(&bond->lock); 1311 return err; 1312 } 1313 1314 static struct netpoll_info *bond_netpoll_info(struct bonding *bond) 1315 { 1316 return bond->dev->npinfo; 1317 } 1318 1319 #else 1320 static inline int slave_enable_netpoll(struct slave *slave) 1321 { 1322 return 0; 1323 } 1324 static inline void slave_disable_netpoll(struct slave *slave) 1325 { 1326 } 1327 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1328 { 1329 } 1330 #endif 1331 1332 /*---------------------------------- IOCTL ----------------------------------*/ 1333 1334 static int bond_sethwaddr(struct net_device *bond_dev, 1335 struct net_device *slave_dev) 1336 { 1337 pr_debug("bond_dev=%p\n", bond_dev); 1338 pr_debug("slave_dev=%p\n", slave_dev); 1339 pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len); 1340 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len); 1341 return 0; 1342 } 1343 1344 static netdev_features_t bond_fix_features(struct net_device *dev, 1345 netdev_features_t features) 1346 { 1347 struct slave *slave; 1348 struct bonding *bond = netdev_priv(dev); 1349 netdev_features_t mask; 1350 int i; 1351 1352 read_lock(&bond->lock); 1353 1354 if (!bond->first_slave) { 1355 /* Disable adding VLANs to empty bond. But why? --mq */ 1356 features |= NETIF_F_VLAN_CHALLENGED; 1357 goto out; 1358 } 1359 1360 mask = features; 1361 features &= ~NETIF_F_ONE_FOR_ALL; 1362 features |= NETIF_F_ALL_FOR_ALL; 1363 1364 bond_for_each_slave(bond, slave, i) { 1365 features = netdev_increment_features(features, 1366 slave->dev->features, 1367 mask); 1368 } 1369 1370 out: 1371 read_unlock(&bond->lock); 1372 return features; 1373 } 1374 1375 #define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \ 1376 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \ 1377 NETIF_F_HIGHDMA | NETIF_F_LRO) 1378 1379 static void bond_compute_features(struct bonding *bond) 1380 { 1381 struct slave *slave; 1382 struct net_device *bond_dev = bond->dev; 1383 netdev_features_t vlan_features = BOND_VLAN_FEATURES; 1384 unsigned short max_hard_header_len = ETH_HLEN; 1385 int i; 1386 1387 read_lock(&bond->lock); 1388 1389 if (!bond->first_slave) 1390 goto done; 1391 1392 bond_for_each_slave(bond, slave, i) { 1393 vlan_features = netdev_increment_features(vlan_features, 1394 slave->dev->vlan_features, BOND_VLAN_FEATURES); 1395 1396 if (slave->dev->hard_header_len > max_hard_header_len) 1397 max_hard_header_len = slave->dev->hard_header_len; 1398 } 1399 1400 done: 1401 bond_dev->vlan_features = vlan_features; 1402 bond_dev->hard_header_len = max_hard_header_len; 1403 1404 read_unlock(&bond->lock); 1405 1406 netdev_change_features(bond_dev); 1407 } 1408 1409 static void bond_setup_by_slave(struct net_device *bond_dev, 1410 struct net_device *slave_dev) 1411 { 1412 struct bonding *bond = netdev_priv(bond_dev); 1413 1414 bond_dev->header_ops = slave_dev->header_ops; 1415 1416 bond_dev->type = slave_dev->type; 1417 bond_dev->hard_header_len = slave_dev->hard_header_len; 1418 bond_dev->addr_len = slave_dev->addr_len; 1419 1420 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1421 slave_dev->addr_len); 1422 bond->setup_by_slave = 1; 1423 } 1424 1425 /* On bonding slaves other than the currently active slave, suppress 1426 * duplicates except for alb non-mcast/bcast. 1427 */ 1428 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1429 struct slave *slave, 1430 struct bonding *bond) 1431 { 1432 if (bond_is_slave_inactive(slave)) { 1433 if (bond->params.mode == BOND_MODE_ALB && 1434 skb->pkt_type != PACKET_BROADCAST && 1435 skb->pkt_type != PACKET_MULTICAST) 1436 return false; 1437 return true; 1438 } 1439 return false; 1440 } 1441 1442 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1443 { 1444 struct sk_buff *skb = *pskb; 1445 struct slave *slave; 1446 struct bonding *bond; 1447 void (*recv_probe)(struct sk_buff *, struct bonding *, 1448 struct slave *); 1449 1450 skb = skb_share_check(skb, GFP_ATOMIC); 1451 if (unlikely(!skb)) 1452 return RX_HANDLER_CONSUMED; 1453 1454 *pskb = skb; 1455 1456 slave = bond_slave_get_rcu(skb->dev); 1457 bond = slave->bond; 1458 1459 if (bond->params.arp_interval) 1460 slave->dev->last_rx = jiffies; 1461 1462 recv_probe = ACCESS_ONCE(bond->recv_probe); 1463 if (recv_probe) { 1464 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); 1465 1466 if (likely(nskb)) { 1467 recv_probe(nskb, bond, slave); 1468 dev_kfree_skb(nskb); 1469 } 1470 } 1471 1472 if (bond_should_deliver_exact_match(skb, slave, bond)) { 1473 return RX_HANDLER_EXACT; 1474 } 1475 1476 skb->dev = bond->dev; 1477 1478 if (bond->params.mode == BOND_MODE_ALB && 1479 bond->dev->priv_flags & IFF_BRIDGE_PORT && 1480 skb->pkt_type == PACKET_HOST) { 1481 1482 if (unlikely(skb_cow_head(skb, 1483 skb->data - skb_mac_header(skb)))) { 1484 kfree_skb(skb); 1485 return RX_HANDLER_CONSUMED; 1486 } 1487 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN); 1488 } 1489 1490 return RX_HANDLER_ANOTHER; 1491 } 1492 1493 /* enslave device <slave> to bond device <master> */ 1494 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev) 1495 { 1496 struct bonding *bond = netdev_priv(bond_dev); 1497 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1498 struct slave *new_slave = NULL; 1499 struct netdev_hw_addr *ha; 1500 struct sockaddr addr; 1501 int link_reporting; 1502 int res = 0; 1503 1504 if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL && 1505 slave_ops->ndo_do_ioctl == NULL) { 1506 pr_warning("%s: Warning: no link monitoring support for %s\n", 1507 bond_dev->name, slave_dev->name); 1508 } 1509 1510 /* already enslaved */ 1511 if (slave_dev->flags & IFF_SLAVE) { 1512 pr_debug("Error, Device was already enslaved\n"); 1513 return -EBUSY; 1514 } 1515 1516 /* vlan challenged mutual exclusion */ 1517 /* no need to lock since we're protected by rtnl_lock */ 1518 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1519 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name); 1520 if (bond_vlan_used(bond)) { 1521 pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n", 1522 bond_dev->name, slave_dev->name, bond_dev->name); 1523 return -EPERM; 1524 } else { 1525 pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n", 1526 bond_dev->name, slave_dev->name, 1527 slave_dev->name, bond_dev->name); 1528 } 1529 } else { 1530 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name); 1531 } 1532 1533 /* 1534 * Old ifenslave binaries are no longer supported. These can 1535 * be identified with moderate accuracy by the state of the slave: 1536 * the current ifenslave will set the interface down prior to 1537 * enslaving it; the old ifenslave will not. 1538 */ 1539 if ((slave_dev->flags & IFF_UP)) { 1540 pr_err("%s is up. This may be due to an out of date ifenslave.\n", 1541 slave_dev->name); 1542 res = -EPERM; 1543 goto err_undo_flags; 1544 } 1545 1546 /* set bonding device ether type by slave - bonding netdevices are 1547 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1548 * there is a need to override some of the type dependent attribs/funcs. 1549 * 1550 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1551 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1552 */ 1553 if (bond->slave_cnt == 0) { 1554 if (bond_dev->type != slave_dev->type) { 1555 pr_debug("%s: change device type from %d to %d\n", 1556 bond_dev->name, 1557 bond_dev->type, slave_dev->type); 1558 1559 res = netdev_bonding_change(bond_dev, 1560 NETDEV_PRE_TYPE_CHANGE); 1561 res = notifier_to_errno(res); 1562 if (res) { 1563 pr_err("%s: refused to change device type\n", 1564 bond_dev->name); 1565 res = -EBUSY; 1566 goto err_undo_flags; 1567 } 1568 1569 /* Flush unicast and multicast addresses */ 1570 dev_uc_flush(bond_dev); 1571 dev_mc_flush(bond_dev); 1572 1573 if (slave_dev->type != ARPHRD_ETHER) 1574 bond_setup_by_slave(bond_dev, slave_dev); 1575 else { 1576 ether_setup(bond_dev); 1577 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1578 } 1579 1580 netdev_bonding_change(bond_dev, 1581 NETDEV_POST_TYPE_CHANGE); 1582 } 1583 } else if (bond_dev->type != slave_dev->type) { 1584 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n", 1585 slave_dev->name, 1586 slave_dev->type, bond_dev->type); 1587 res = -EINVAL; 1588 goto err_undo_flags; 1589 } 1590 1591 if (slave_ops->ndo_set_mac_address == NULL) { 1592 if (bond->slave_cnt == 0) { 1593 pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.", 1594 bond_dev->name); 1595 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1596 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1597 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", 1598 bond_dev->name); 1599 res = -EOPNOTSUPP; 1600 goto err_undo_flags; 1601 } 1602 } 1603 1604 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1605 1606 /* If this is the first slave, then we need to set the master's hardware 1607 * address to be the same as the slave's. */ 1608 if (is_zero_ether_addr(bond->dev->dev_addr)) 1609 memcpy(bond->dev->dev_addr, slave_dev->dev_addr, 1610 slave_dev->addr_len); 1611 1612 1613 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL); 1614 if (!new_slave) { 1615 res = -ENOMEM; 1616 goto err_undo_flags; 1617 } 1618 1619 /* 1620 * Set the new_slave's queue_id to be zero. Queue ID mapping 1621 * is set via sysfs or module option if desired. 1622 */ 1623 new_slave->queue_id = 0; 1624 1625 /* Save slave's original mtu and then set it to match the bond */ 1626 new_slave->original_mtu = slave_dev->mtu; 1627 res = dev_set_mtu(slave_dev, bond->dev->mtu); 1628 if (res) { 1629 pr_debug("Error %d calling dev_set_mtu\n", res); 1630 goto err_free; 1631 } 1632 1633 /* 1634 * Save slave's original ("permanent") mac address for modes 1635 * that need it, and for restoring it upon release, and then 1636 * set it to the master's address 1637 */ 1638 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN); 1639 1640 if (!bond->params.fail_over_mac) { 1641 /* 1642 * Set slave to master's mac address. The application already 1643 * set the master's mac address to that of the first slave 1644 */ 1645 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 1646 addr.sa_family = slave_dev->type; 1647 res = dev_set_mac_address(slave_dev, &addr); 1648 if (res) { 1649 pr_debug("Error %d calling set_mac_address\n", res); 1650 goto err_restore_mtu; 1651 } 1652 } 1653 1654 res = netdev_set_bond_master(slave_dev, bond_dev); 1655 if (res) { 1656 pr_debug("Error %d calling netdev_set_bond_master\n", res); 1657 goto err_restore_mac; 1658 } 1659 1660 /* open the slave since the application closed it */ 1661 res = dev_open(slave_dev); 1662 if (res) { 1663 pr_debug("Opening slave %s failed\n", slave_dev->name); 1664 goto err_unset_master; 1665 } 1666 1667 new_slave->bond = bond; 1668 new_slave->dev = slave_dev; 1669 slave_dev->priv_flags |= IFF_BONDING; 1670 1671 if (bond_is_lb(bond)) { 1672 /* bond_alb_init_slave() must be called before all other stages since 1673 * it might fail and we do not want to have to undo everything 1674 */ 1675 res = bond_alb_init_slave(bond, new_slave); 1676 if (res) 1677 goto err_close; 1678 } 1679 1680 /* If the mode USES_PRIMARY, then the new slave gets the 1681 * master's promisc (and mc) settings only if it becomes the 1682 * curr_active_slave, and that is taken care of later when calling 1683 * bond_change_active() 1684 */ 1685 if (!USES_PRIMARY(bond->params.mode)) { 1686 /* set promiscuity level to new slave */ 1687 if (bond_dev->flags & IFF_PROMISC) { 1688 res = dev_set_promiscuity(slave_dev, 1); 1689 if (res) 1690 goto err_close; 1691 } 1692 1693 /* set allmulti level to new slave */ 1694 if (bond_dev->flags & IFF_ALLMULTI) { 1695 res = dev_set_allmulti(slave_dev, 1); 1696 if (res) 1697 goto err_close; 1698 } 1699 1700 netif_addr_lock_bh(bond_dev); 1701 /* upload master's mc_list to new slave */ 1702 netdev_for_each_mc_addr(ha, bond_dev) 1703 dev_mc_add(slave_dev, ha->addr); 1704 netif_addr_unlock_bh(bond_dev); 1705 } 1706 1707 if (bond->params.mode == BOND_MODE_8023AD) { 1708 /* add lacpdu mc addr to mc list */ 1709 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 1710 1711 dev_mc_add(slave_dev, lacpdu_multicast); 1712 } 1713 1714 bond_add_vlans_on_slave(bond, slave_dev); 1715 1716 write_lock_bh(&bond->lock); 1717 1718 bond_attach_slave(bond, new_slave); 1719 1720 new_slave->delay = 0; 1721 new_slave->link_failure_count = 0; 1722 1723 write_unlock_bh(&bond->lock); 1724 1725 bond_compute_features(bond); 1726 1727 read_lock(&bond->lock); 1728 1729 new_slave->last_arp_rx = jiffies; 1730 1731 if (bond->params.miimon && !bond->params.use_carrier) { 1732 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 1733 1734 if ((link_reporting == -1) && !bond->params.arp_interval) { 1735 /* 1736 * miimon is set but a bonded network driver 1737 * does not support ETHTOOL/MII and 1738 * arp_interval is not set. Note: if 1739 * use_carrier is enabled, we will never go 1740 * here (because netif_carrier is always 1741 * supported); thus, we don't need to change 1742 * the messages for netif_carrier. 1743 */ 1744 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", 1745 bond_dev->name, slave_dev->name); 1746 } else if (link_reporting == -1) { 1747 /* unable get link status using mii/ethtool */ 1748 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", 1749 bond_dev->name, slave_dev->name); 1750 } 1751 } 1752 1753 /* check for initial state */ 1754 if (!bond->params.miimon || 1755 (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) { 1756 if (bond->params.updelay) { 1757 pr_debug("Initial state of slave_dev is BOND_LINK_BACK\n"); 1758 new_slave->link = BOND_LINK_BACK; 1759 new_slave->delay = bond->params.updelay; 1760 } else { 1761 pr_debug("Initial state of slave_dev is BOND_LINK_UP\n"); 1762 new_slave->link = BOND_LINK_UP; 1763 } 1764 new_slave->jiffies = jiffies; 1765 } else { 1766 pr_debug("Initial state of slave_dev is BOND_LINK_DOWN\n"); 1767 new_slave->link = BOND_LINK_DOWN; 1768 } 1769 1770 bond_update_speed_duplex(new_slave); 1771 1772 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) { 1773 /* if there is a primary slave, remember it */ 1774 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 1775 bond->primary_slave = new_slave; 1776 bond->force_primary = true; 1777 } 1778 } 1779 1780 write_lock_bh(&bond->curr_slave_lock); 1781 1782 switch (bond->params.mode) { 1783 case BOND_MODE_ACTIVEBACKUP: 1784 bond_set_slave_inactive_flags(new_slave); 1785 bond_select_active_slave(bond); 1786 break; 1787 case BOND_MODE_8023AD: 1788 /* in 802.3ad mode, the internal mechanism 1789 * will activate the slaves in the selected 1790 * aggregator 1791 */ 1792 bond_set_slave_inactive_flags(new_slave); 1793 /* if this is the first slave */ 1794 if (bond->slave_cnt == 1) { 1795 SLAVE_AD_INFO(new_slave).id = 1; 1796 /* Initialize AD with the number of times that the AD timer is called in 1 second 1797 * can be called only after the mac address of the bond is set 1798 */ 1799 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL); 1800 } else { 1801 SLAVE_AD_INFO(new_slave).id = 1802 SLAVE_AD_INFO(new_slave->prev).id + 1; 1803 } 1804 1805 bond_3ad_bind_slave(new_slave); 1806 break; 1807 case BOND_MODE_TLB: 1808 case BOND_MODE_ALB: 1809 bond_set_active_slave(new_slave); 1810 bond_set_slave_inactive_flags(new_slave); 1811 bond_select_active_slave(bond); 1812 break; 1813 default: 1814 pr_debug("This slave is always active in trunk mode\n"); 1815 1816 /* always active in trunk mode */ 1817 bond_set_active_slave(new_slave); 1818 1819 /* In trunking mode there is little meaning to curr_active_slave 1820 * anyway (it holds no special properties of the bond device), 1821 * so we can change it without calling change_active_interface() 1822 */ 1823 if (!bond->curr_active_slave) 1824 bond->curr_active_slave = new_slave; 1825 1826 break; 1827 } /* switch(bond_mode) */ 1828 1829 write_unlock_bh(&bond->curr_slave_lock); 1830 1831 bond_set_carrier(bond); 1832 1833 #ifdef CONFIG_NET_POLL_CONTROLLER 1834 slave_dev->npinfo = bond_netpoll_info(bond); 1835 if (slave_dev->npinfo) { 1836 if (slave_enable_netpoll(new_slave)) { 1837 read_unlock(&bond->lock); 1838 pr_info("Error, %s: master_dev is using netpoll, " 1839 "but new slave device does not support netpoll.\n", 1840 bond_dev->name); 1841 res = -EBUSY; 1842 goto err_detach; 1843 } 1844 } 1845 #endif 1846 1847 read_unlock(&bond->lock); 1848 1849 res = bond_create_slave_symlinks(bond_dev, slave_dev); 1850 if (res) 1851 goto err_detach; 1852 1853 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 1854 new_slave); 1855 if (res) { 1856 pr_debug("Error %d calling netdev_rx_handler_register\n", res); 1857 goto err_dest_symlinks; 1858 } 1859 1860 pr_info("%s: enslaving %s as a%s interface with a%s link.\n", 1861 bond_dev->name, slave_dev->name, 1862 bond_is_active_slave(new_slave) ? "n active" : " backup", 1863 new_slave->link != BOND_LINK_DOWN ? "n up" : " down"); 1864 1865 /* enslave is successful */ 1866 return 0; 1867 1868 /* Undo stages on error */ 1869 err_dest_symlinks: 1870 bond_destroy_slave_symlinks(bond_dev, slave_dev); 1871 1872 err_detach: 1873 write_lock_bh(&bond->lock); 1874 bond_detach_slave(bond, new_slave); 1875 write_unlock_bh(&bond->lock); 1876 1877 err_close: 1878 dev_close(slave_dev); 1879 1880 err_unset_master: 1881 netdev_set_bond_master(slave_dev, NULL); 1882 1883 err_restore_mac: 1884 if (!bond->params.fail_over_mac) { 1885 /* XXX TODO - fom follow mode needs to change master's 1886 * MAC if this slave's MAC is in use by the bond, or at 1887 * least print a warning. 1888 */ 1889 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN); 1890 addr.sa_family = slave_dev->type; 1891 dev_set_mac_address(slave_dev, &addr); 1892 } 1893 1894 err_restore_mtu: 1895 dev_set_mtu(slave_dev, new_slave->original_mtu); 1896 1897 err_free: 1898 kfree(new_slave); 1899 1900 err_undo_flags: 1901 bond_compute_features(bond); 1902 1903 return res; 1904 } 1905 1906 /* 1907 * Try to release the slave device <slave> from the bond device <master> 1908 * It is legal to access curr_active_slave without a lock because all the function 1909 * is write-locked. 1910 * 1911 * The rules for slave state should be: 1912 * for Active/Backup: 1913 * Active stays on all backups go down 1914 * for Bonded connections: 1915 * The first up interface should be left on and all others downed. 1916 */ 1917 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 1918 { 1919 struct bonding *bond = netdev_priv(bond_dev); 1920 struct slave *slave, *oldcurrent; 1921 struct sockaddr addr; 1922 netdev_features_t old_features = bond_dev->features; 1923 1924 /* slave is not a slave or master is not master of this slave */ 1925 if (!(slave_dev->flags & IFF_SLAVE) || 1926 (slave_dev->master != bond_dev)) { 1927 pr_err("%s: Error: cannot release %s.\n", 1928 bond_dev->name, slave_dev->name); 1929 return -EINVAL; 1930 } 1931 1932 block_netpoll_tx(); 1933 netdev_bonding_change(bond_dev, NETDEV_RELEASE); 1934 write_lock_bh(&bond->lock); 1935 1936 slave = bond_get_slave_by_dev(bond, slave_dev); 1937 if (!slave) { 1938 /* not a slave of this bond */ 1939 pr_info("%s: %s not enslaved\n", 1940 bond_dev->name, slave_dev->name); 1941 write_unlock_bh(&bond->lock); 1942 unblock_netpoll_tx(); 1943 return -EINVAL; 1944 } 1945 1946 /* unregister rx_handler early so bond_handle_frame wouldn't be called 1947 * for this slave anymore. 1948 */ 1949 netdev_rx_handler_unregister(slave_dev); 1950 write_unlock_bh(&bond->lock); 1951 synchronize_net(); 1952 write_lock_bh(&bond->lock); 1953 1954 if (!bond->params.fail_over_mac) { 1955 if (!compare_ether_addr(bond_dev->dev_addr, slave->perm_hwaddr) && 1956 bond->slave_cnt > 1) 1957 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", 1958 bond_dev->name, slave_dev->name, 1959 slave->perm_hwaddr, 1960 bond_dev->name, slave_dev->name); 1961 } 1962 1963 /* Inform AD package of unbinding of slave. */ 1964 if (bond->params.mode == BOND_MODE_8023AD) { 1965 /* must be called before the slave is 1966 * detached from the list 1967 */ 1968 bond_3ad_unbind_slave(slave); 1969 } 1970 1971 pr_info("%s: releasing %s interface %s\n", 1972 bond_dev->name, 1973 bond_is_active_slave(slave) ? "active" : "backup", 1974 slave_dev->name); 1975 1976 oldcurrent = bond->curr_active_slave; 1977 1978 bond->current_arp_slave = NULL; 1979 1980 /* release the slave from its bond */ 1981 bond_detach_slave(bond, slave); 1982 1983 if (bond->primary_slave == slave) 1984 bond->primary_slave = NULL; 1985 1986 if (oldcurrent == slave) 1987 bond_change_active_slave(bond, NULL); 1988 1989 if (bond_is_lb(bond)) { 1990 /* Must be called only after the slave has been 1991 * detached from the list and the curr_active_slave 1992 * has been cleared (if our_slave == old_current), 1993 * but before a new active slave is selected. 1994 */ 1995 write_unlock_bh(&bond->lock); 1996 bond_alb_deinit_slave(bond, slave); 1997 write_lock_bh(&bond->lock); 1998 } 1999 2000 if (oldcurrent == slave) { 2001 /* 2002 * Note that we hold RTNL over this sequence, so there 2003 * is no concern that another slave add/remove event 2004 * will interfere. 2005 */ 2006 write_unlock_bh(&bond->lock); 2007 read_lock(&bond->lock); 2008 write_lock_bh(&bond->curr_slave_lock); 2009 2010 bond_select_active_slave(bond); 2011 2012 write_unlock_bh(&bond->curr_slave_lock); 2013 read_unlock(&bond->lock); 2014 write_lock_bh(&bond->lock); 2015 } 2016 2017 if (bond->slave_cnt == 0) { 2018 bond_set_carrier(bond); 2019 2020 /* if the last slave was removed, zero the mac address 2021 * of the master so it will be set by the application 2022 * to the mac address of the first slave 2023 */ 2024 memset(bond_dev->dev_addr, 0, bond_dev->addr_len); 2025 2026 if (bond_vlan_used(bond)) { 2027 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n", 2028 bond_dev->name, bond_dev->name); 2029 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n", 2030 bond_dev->name); 2031 } 2032 } 2033 2034 write_unlock_bh(&bond->lock); 2035 unblock_netpoll_tx(); 2036 2037 if (bond->slave_cnt == 0) 2038 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 2039 2040 bond_compute_features(bond); 2041 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 2042 (old_features & NETIF_F_VLAN_CHALLENGED)) 2043 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n", 2044 bond_dev->name, slave_dev->name, bond_dev->name); 2045 2046 /* must do this from outside any spinlocks */ 2047 bond_destroy_slave_symlinks(bond_dev, slave_dev); 2048 2049 bond_del_vlans_from_slave(bond, slave_dev); 2050 2051 /* If the mode USES_PRIMARY, then we should only remove its 2052 * promisc and mc settings if it was the curr_active_slave, but that was 2053 * already taken care of above when we detached the slave 2054 */ 2055 if (!USES_PRIMARY(bond->params.mode)) { 2056 /* unset promiscuity level from slave */ 2057 if (bond_dev->flags & IFF_PROMISC) 2058 dev_set_promiscuity(slave_dev, -1); 2059 2060 /* unset allmulti level from slave */ 2061 if (bond_dev->flags & IFF_ALLMULTI) 2062 dev_set_allmulti(slave_dev, -1); 2063 2064 /* flush master's mc_list from slave */ 2065 netif_addr_lock_bh(bond_dev); 2066 bond_mc_list_flush(bond_dev, slave_dev); 2067 netif_addr_unlock_bh(bond_dev); 2068 } 2069 2070 netdev_set_bond_master(slave_dev, NULL); 2071 2072 slave_disable_netpoll(slave); 2073 2074 /* close slave before restoring its mac address */ 2075 dev_close(slave_dev); 2076 2077 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 2078 /* restore original ("permanent") mac address */ 2079 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN); 2080 addr.sa_family = slave_dev->type; 2081 dev_set_mac_address(slave_dev, &addr); 2082 } 2083 2084 dev_set_mtu(slave_dev, slave->original_mtu); 2085 2086 slave_dev->priv_flags &= ~IFF_BONDING; 2087 2088 kfree(slave); 2089 2090 return 0; /* deletion OK */ 2091 } 2092 2093 /* 2094 * First release a slave and then destroy the bond if no more slaves are left. 2095 * Must be under rtnl_lock when this function is called. 2096 */ 2097 static int bond_release_and_destroy(struct net_device *bond_dev, 2098 struct net_device *slave_dev) 2099 { 2100 struct bonding *bond = netdev_priv(bond_dev); 2101 int ret; 2102 2103 ret = bond_release(bond_dev, slave_dev); 2104 if ((ret == 0) && (bond->slave_cnt == 0)) { 2105 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 2106 pr_info("%s: destroying bond %s.\n", 2107 bond_dev->name, bond_dev->name); 2108 unregister_netdevice(bond_dev); 2109 } 2110 return ret; 2111 } 2112 2113 /* 2114 * This function releases all slaves. 2115 */ 2116 static int bond_release_all(struct net_device *bond_dev) 2117 { 2118 struct bonding *bond = netdev_priv(bond_dev); 2119 struct slave *slave; 2120 struct net_device *slave_dev; 2121 struct sockaddr addr; 2122 2123 write_lock_bh(&bond->lock); 2124 2125 netif_carrier_off(bond_dev); 2126 2127 if (bond->slave_cnt == 0) 2128 goto out; 2129 2130 bond->current_arp_slave = NULL; 2131 bond->primary_slave = NULL; 2132 bond_change_active_slave(bond, NULL); 2133 2134 while ((slave = bond->first_slave) != NULL) { 2135 /* Inform AD package of unbinding of slave 2136 * before slave is detached from the list. 2137 */ 2138 if (bond->params.mode == BOND_MODE_8023AD) 2139 bond_3ad_unbind_slave(slave); 2140 2141 slave_dev = slave->dev; 2142 bond_detach_slave(bond, slave); 2143 2144 /* now that the slave is detached, unlock and perform 2145 * all the undo steps that should not be called from 2146 * within a lock. 2147 */ 2148 write_unlock_bh(&bond->lock); 2149 2150 /* unregister rx_handler early so bond_handle_frame wouldn't 2151 * be called for this slave anymore. 2152 */ 2153 netdev_rx_handler_unregister(slave_dev); 2154 synchronize_net(); 2155 2156 if (bond_is_lb(bond)) { 2157 /* must be called only after the slave 2158 * has been detached from the list 2159 */ 2160 bond_alb_deinit_slave(bond, slave); 2161 } 2162 2163 bond_destroy_slave_symlinks(bond_dev, slave_dev); 2164 bond_del_vlans_from_slave(bond, slave_dev); 2165 2166 /* If the mode USES_PRIMARY, then we should only remove its 2167 * promisc and mc settings if it was the curr_active_slave, but that was 2168 * already taken care of above when we detached the slave 2169 */ 2170 if (!USES_PRIMARY(bond->params.mode)) { 2171 /* unset promiscuity level from slave */ 2172 if (bond_dev->flags & IFF_PROMISC) 2173 dev_set_promiscuity(slave_dev, -1); 2174 2175 /* unset allmulti level from slave */ 2176 if (bond_dev->flags & IFF_ALLMULTI) 2177 dev_set_allmulti(slave_dev, -1); 2178 2179 /* flush master's mc_list from slave */ 2180 netif_addr_lock_bh(bond_dev); 2181 bond_mc_list_flush(bond_dev, slave_dev); 2182 netif_addr_unlock_bh(bond_dev); 2183 } 2184 2185 netdev_set_bond_master(slave_dev, NULL); 2186 2187 slave_disable_netpoll(slave); 2188 2189 /* close slave before restoring its mac address */ 2190 dev_close(slave_dev); 2191 2192 if (!bond->params.fail_over_mac) { 2193 /* restore original ("permanent") mac address*/ 2194 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN); 2195 addr.sa_family = slave_dev->type; 2196 dev_set_mac_address(slave_dev, &addr); 2197 } 2198 2199 kfree(slave); 2200 2201 /* re-acquire the lock before getting the next slave */ 2202 write_lock_bh(&bond->lock); 2203 } 2204 2205 /* zero the mac address of the master so it will be 2206 * set by the application to the mac address of the 2207 * first slave 2208 */ 2209 memset(bond_dev->dev_addr, 0, bond_dev->addr_len); 2210 2211 if (bond_vlan_used(bond)) { 2212 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n", 2213 bond_dev->name, bond_dev->name); 2214 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n", 2215 bond_dev->name); 2216 } 2217 2218 pr_info("%s: released all slaves\n", bond_dev->name); 2219 2220 out: 2221 write_unlock_bh(&bond->lock); 2222 2223 bond_compute_features(bond); 2224 2225 return 0; 2226 } 2227 2228 /* 2229 * This function changes the active slave to slave <slave_dev>. 2230 * It returns -EINVAL in the following cases. 2231 * - <slave_dev> is not found in the list. 2232 * - There is not active slave now. 2233 * - <slave_dev> is already active. 2234 * - The link state of <slave_dev> is not BOND_LINK_UP. 2235 * - <slave_dev> is not running. 2236 * In these cases, this function does nothing. 2237 * In the other cases, current_slave pointer is changed and 0 is returned. 2238 */ 2239 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev) 2240 { 2241 struct bonding *bond = netdev_priv(bond_dev); 2242 struct slave *old_active = NULL; 2243 struct slave *new_active = NULL; 2244 int res = 0; 2245 2246 if (!USES_PRIMARY(bond->params.mode)) 2247 return -EINVAL; 2248 2249 /* Verify that master_dev is indeed the master of slave_dev */ 2250 if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev)) 2251 return -EINVAL; 2252 2253 read_lock(&bond->lock); 2254 2255 read_lock(&bond->curr_slave_lock); 2256 old_active = bond->curr_active_slave; 2257 read_unlock(&bond->curr_slave_lock); 2258 2259 new_active = bond_get_slave_by_dev(bond, slave_dev); 2260 2261 /* 2262 * Changing to the current active: do nothing; return success. 2263 */ 2264 if (new_active && (new_active == old_active)) { 2265 read_unlock(&bond->lock); 2266 return 0; 2267 } 2268 2269 if ((new_active) && 2270 (old_active) && 2271 (new_active->link == BOND_LINK_UP) && 2272 IS_UP(new_active->dev)) { 2273 block_netpoll_tx(); 2274 write_lock_bh(&bond->curr_slave_lock); 2275 bond_change_active_slave(bond, new_active); 2276 write_unlock_bh(&bond->curr_slave_lock); 2277 unblock_netpoll_tx(); 2278 } else 2279 res = -EINVAL; 2280 2281 read_unlock(&bond->lock); 2282 2283 return res; 2284 } 2285 2286 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info) 2287 { 2288 struct bonding *bond = netdev_priv(bond_dev); 2289 2290 info->bond_mode = bond->params.mode; 2291 info->miimon = bond->params.miimon; 2292 2293 read_lock(&bond->lock); 2294 info->num_slaves = bond->slave_cnt; 2295 read_unlock(&bond->lock); 2296 2297 return 0; 2298 } 2299 2300 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 2301 { 2302 struct bonding *bond = netdev_priv(bond_dev); 2303 struct slave *slave; 2304 int i, res = -ENODEV; 2305 2306 read_lock(&bond->lock); 2307 2308 bond_for_each_slave(bond, slave, i) { 2309 if (i == (int)info->slave_id) { 2310 res = 0; 2311 strcpy(info->slave_name, slave->dev->name); 2312 info->link = slave->link; 2313 info->state = bond_slave_state(slave); 2314 info->link_failure_count = slave->link_failure_count; 2315 break; 2316 } 2317 } 2318 2319 read_unlock(&bond->lock); 2320 2321 return res; 2322 } 2323 2324 /*-------------------------------- Monitoring -------------------------------*/ 2325 2326 2327 static int bond_miimon_inspect(struct bonding *bond) 2328 { 2329 struct slave *slave; 2330 int i, link_state, commit = 0; 2331 bool ignore_updelay; 2332 2333 ignore_updelay = !bond->curr_active_slave ? true : false; 2334 2335 bond_for_each_slave(bond, slave, i) { 2336 slave->new_link = BOND_LINK_NOCHANGE; 2337 2338 link_state = bond_check_dev_link(bond, slave->dev, 0); 2339 2340 switch (slave->link) { 2341 case BOND_LINK_UP: 2342 if (link_state) 2343 continue; 2344 2345 slave->link = BOND_LINK_FAIL; 2346 slave->delay = bond->params.downdelay; 2347 if (slave->delay) { 2348 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n", 2349 bond->dev->name, 2350 (bond->params.mode == 2351 BOND_MODE_ACTIVEBACKUP) ? 2352 (bond_is_active_slave(slave) ? 2353 "active " : "backup ") : "", 2354 slave->dev->name, 2355 bond->params.downdelay * bond->params.miimon); 2356 } 2357 /*FALLTHRU*/ 2358 case BOND_LINK_FAIL: 2359 if (link_state) { 2360 /* 2361 * recovered before downdelay expired 2362 */ 2363 slave->link = BOND_LINK_UP; 2364 slave->jiffies = jiffies; 2365 pr_info("%s: link status up again after %d ms for interface %s.\n", 2366 bond->dev->name, 2367 (bond->params.downdelay - slave->delay) * 2368 bond->params.miimon, 2369 slave->dev->name); 2370 continue; 2371 } 2372 2373 if (slave->delay <= 0) { 2374 slave->new_link = BOND_LINK_DOWN; 2375 commit++; 2376 continue; 2377 } 2378 2379 slave->delay--; 2380 break; 2381 2382 case BOND_LINK_DOWN: 2383 if (!link_state) 2384 continue; 2385 2386 slave->link = BOND_LINK_BACK; 2387 slave->delay = bond->params.updelay; 2388 2389 if (slave->delay) { 2390 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n", 2391 bond->dev->name, slave->dev->name, 2392 ignore_updelay ? 0 : 2393 bond->params.updelay * 2394 bond->params.miimon); 2395 } 2396 /*FALLTHRU*/ 2397 case BOND_LINK_BACK: 2398 if (!link_state) { 2399 slave->link = BOND_LINK_DOWN; 2400 pr_info("%s: link status down again after %d ms for interface %s.\n", 2401 bond->dev->name, 2402 (bond->params.updelay - slave->delay) * 2403 bond->params.miimon, 2404 slave->dev->name); 2405 2406 continue; 2407 } 2408 2409 if (ignore_updelay) 2410 slave->delay = 0; 2411 2412 if (slave->delay <= 0) { 2413 slave->new_link = BOND_LINK_UP; 2414 commit++; 2415 ignore_updelay = false; 2416 continue; 2417 } 2418 2419 slave->delay--; 2420 break; 2421 } 2422 } 2423 2424 return commit; 2425 } 2426 2427 static void bond_miimon_commit(struct bonding *bond) 2428 { 2429 struct slave *slave; 2430 int i; 2431 2432 bond_for_each_slave(bond, slave, i) { 2433 switch (slave->new_link) { 2434 case BOND_LINK_NOCHANGE: 2435 continue; 2436 2437 case BOND_LINK_UP: 2438 slave->link = BOND_LINK_UP; 2439 slave->jiffies = jiffies; 2440 2441 if (bond->params.mode == BOND_MODE_8023AD) { 2442 /* prevent it from being the active one */ 2443 bond_set_backup_slave(slave); 2444 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) { 2445 /* make it immediately active */ 2446 bond_set_active_slave(slave); 2447 } else if (slave != bond->primary_slave) { 2448 /* prevent it from being the active one */ 2449 bond_set_backup_slave(slave); 2450 } 2451 2452 bond_update_speed_duplex(slave); 2453 2454 pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n", 2455 bond->dev->name, slave->dev->name, 2456 slave->speed, slave->duplex ? "full" : "half"); 2457 2458 /* notify ad that the link status has changed */ 2459 if (bond->params.mode == BOND_MODE_8023AD) 2460 bond_3ad_handle_link_change(slave, BOND_LINK_UP); 2461 2462 if (bond_is_lb(bond)) 2463 bond_alb_handle_link_change(bond, slave, 2464 BOND_LINK_UP); 2465 2466 if (!bond->curr_active_slave || 2467 (slave == bond->primary_slave)) 2468 goto do_failover; 2469 2470 continue; 2471 2472 case BOND_LINK_DOWN: 2473 if (slave->link_failure_count < UINT_MAX) 2474 slave->link_failure_count++; 2475 2476 slave->link = BOND_LINK_DOWN; 2477 2478 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP || 2479 bond->params.mode == BOND_MODE_8023AD) 2480 bond_set_slave_inactive_flags(slave); 2481 2482 pr_info("%s: link status definitely down for interface %s, disabling it\n", 2483 bond->dev->name, slave->dev->name); 2484 2485 if (bond->params.mode == BOND_MODE_8023AD) 2486 bond_3ad_handle_link_change(slave, 2487 BOND_LINK_DOWN); 2488 2489 if (bond_is_lb(bond)) 2490 bond_alb_handle_link_change(bond, slave, 2491 BOND_LINK_DOWN); 2492 2493 if (slave == bond->curr_active_slave) 2494 goto do_failover; 2495 2496 continue; 2497 2498 default: 2499 pr_err("%s: invalid new link %d on slave %s\n", 2500 bond->dev->name, slave->new_link, 2501 slave->dev->name); 2502 slave->new_link = BOND_LINK_NOCHANGE; 2503 2504 continue; 2505 } 2506 2507 do_failover: 2508 ASSERT_RTNL(); 2509 block_netpoll_tx(); 2510 write_lock_bh(&bond->curr_slave_lock); 2511 bond_select_active_slave(bond); 2512 write_unlock_bh(&bond->curr_slave_lock); 2513 unblock_netpoll_tx(); 2514 } 2515 2516 bond_set_carrier(bond); 2517 } 2518 2519 /* 2520 * bond_mii_monitor 2521 * 2522 * Really a wrapper that splits the mii monitor into two phases: an 2523 * inspection, then (if inspection indicates something needs to be done) 2524 * an acquisition of appropriate locks followed by a commit phase to 2525 * implement whatever link state changes are indicated. 2526 */ 2527 void bond_mii_monitor(struct work_struct *work) 2528 { 2529 struct bonding *bond = container_of(work, struct bonding, 2530 mii_work.work); 2531 bool should_notify_peers = false; 2532 unsigned long delay; 2533 2534 read_lock(&bond->lock); 2535 2536 delay = msecs_to_jiffies(bond->params.miimon); 2537 2538 if (bond->slave_cnt == 0) 2539 goto re_arm; 2540 2541 should_notify_peers = bond_should_notify_peers(bond); 2542 2543 if (bond_miimon_inspect(bond)) { 2544 read_unlock(&bond->lock); 2545 2546 /* Race avoidance with bond_close cancel of workqueue */ 2547 if (!rtnl_trylock()) { 2548 read_lock(&bond->lock); 2549 delay = 1; 2550 should_notify_peers = false; 2551 goto re_arm; 2552 } 2553 2554 read_lock(&bond->lock); 2555 2556 bond_miimon_commit(bond); 2557 2558 read_unlock(&bond->lock); 2559 rtnl_unlock(); /* might sleep, hold no other locks */ 2560 read_lock(&bond->lock); 2561 } 2562 2563 re_arm: 2564 if (bond->params.miimon) 2565 queue_delayed_work(bond->wq, &bond->mii_work, delay); 2566 2567 read_unlock(&bond->lock); 2568 2569 if (should_notify_peers) { 2570 if (!rtnl_trylock()) { 2571 read_lock(&bond->lock); 2572 bond->send_peer_notif++; 2573 read_unlock(&bond->lock); 2574 return; 2575 } 2576 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS); 2577 rtnl_unlock(); 2578 } 2579 } 2580 2581 static int bond_has_this_ip(struct bonding *bond, __be32 ip) 2582 { 2583 struct vlan_entry *vlan; 2584 struct net_device *vlan_dev; 2585 2586 if (ip == bond_confirm_addr(bond->dev, 0, ip)) 2587 return 1; 2588 2589 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 2590 rcu_read_lock(); 2591 vlan_dev = __vlan_find_dev_deep(bond->dev, vlan->vlan_id); 2592 rcu_read_unlock(); 2593 if (vlan_dev && ip == bond_confirm_addr(vlan_dev, 0, ip)) 2594 return 1; 2595 } 2596 2597 return 0; 2598 } 2599 2600 /* 2601 * We go to the (large) trouble of VLAN tagging ARP frames because 2602 * switches in VLAN mode (especially if ports are configured as 2603 * "native" to a VLAN) might not pass non-tagged frames. 2604 */ 2605 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id) 2606 { 2607 struct sk_buff *skb; 2608 2609 pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op, 2610 slave_dev->name, dest_ip, src_ip, vlan_id); 2611 2612 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2613 NULL, slave_dev->dev_addr, NULL); 2614 2615 if (!skb) { 2616 pr_err("ARP packet allocation failed\n"); 2617 return; 2618 } 2619 if (vlan_id) { 2620 skb = vlan_put_tag(skb, vlan_id); 2621 if (!skb) { 2622 pr_err("failed to insert VLAN tag\n"); 2623 return; 2624 } 2625 } 2626 arp_xmit(skb); 2627 } 2628 2629 2630 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2631 { 2632 int i, vlan_id; 2633 __be32 *targets = bond->params.arp_targets; 2634 struct vlan_entry *vlan; 2635 struct net_device *vlan_dev = NULL; 2636 struct rtable *rt; 2637 2638 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) { 2639 __be32 addr; 2640 if (!targets[i]) 2641 break; 2642 pr_debug("basa: target %x\n", targets[i]); 2643 if (!bond_vlan_used(bond)) { 2644 pr_debug("basa: empty vlan: arp_send\n"); 2645 addr = bond_confirm_addr(bond->dev, targets[i], 0); 2646 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2647 addr, 0); 2648 continue; 2649 } 2650 2651 /* 2652 * If VLANs are configured, we do a route lookup to 2653 * determine which VLAN interface would be used, so we 2654 * can tag the ARP with the proper VLAN tag. 2655 */ 2656 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 2657 RTO_ONLINK, 0); 2658 if (IS_ERR(rt)) { 2659 if (net_ratelimit()) { 2660 pr_warning("%s: no route to arp_ip_target %pI4\n", 2661 bond->dev->name, &targets[i]); 2662 } 2663 continue; 2664 } 2665 2666 /* 2667 * This target is not on a VLAN 2668 */ 2669 if (rt->dst.dev == bond->dev) { 2670 ip_rt_put(rt); 2671 pr_debug("basa: rtdev == bond->dev: arp_send\n"); 2672 addr = bond_confirm_addr(bond->dev, targets[i], 0); 2673 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2674 addr, 0); 2675 continue; 2676 } 2677 2678 vlan_id = 0; 2679 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 2680 rcu_read_lock(); 2681 vlan_dev = __vlan_find_dev_deep(bond->dev, 2682 vlan->vlan_id); 2683 rcu_read_unlock(); 2684 if (vlan_dev == rt->dst.dev) { 2685 vlan_id = vlan->vlan_id; 2686 pr_debug("basa: vlan match on %s %d\n", 2687 vlan_dev->name, vlan_id); 2688 break; 2689 } 2690 } 2691 2692 if (vlan_id && vlan_dev) { 2693 ip_rt_put(rt); 2694 addr = bond_confirm_addr(vlan_dev, targets[i], 0); 2695 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2696 addr, vlan_id); 2697 continue; 2698 } 2699 2700 if (net_ratelimit()) { 2701 pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n", 2702 bond->dev->name, &targets[i], 2703 rt->dst.dev ? rt->dst.dev->name : "NULL"); 2704 } 2705 ip_rt_put(rt); 2706 } 2707 } 2708 2709 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 2710 { 2711 int i; 2712 __be32 *targets = bond->params.arp_targets; 2713 2714 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) { 2715 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n", 2716 &sip, &tip, i, &targets[i], 2717 bond_has_this_ip(bond, tip)); 2718 if (sip == targets[i]) { 2719 if (bond_has_this_ip(bond, tip)) 2720 slave->last_arp_rx = jiffies; 2721 return; 2722 } 2723 } 2724 } 2725 2726 static void bond_arp_rcv(struct sk_buff *skb, struct bonding *bond, 2727 struct slave *slave) 2728 { 2729 struct arphdr *arp; 2730 unsigned char *arp_ptr; 2731 __be32 sip, tip; 2732 2733 if (skb->protocol != __cpu_to_be16(ETH_P_ARP)) 2734 return; 2735 2736 read_lock(&bond->lock); 2737 2738 pr_debug("bond_arp_rcv: bond %s skb->dev %s\n", 2739 bond->dev->name, skb->dev->name); 2740 2741 if (!pskb_may_pull(skb, arp_hdr_len(bond->dev))) 2742 goto out_unlock; 2743 2744 arp = arp_hdr(skb); 2745 if (arp->ar_hln != bond->dev->addr_len || 2746 skb->pkt_type == PACKET_OTHERHOST || 2747 skb->pkt_type == PACKET_LOOPBACK || 2748 arp->ar_hrd != htons(ARPHRD_ETHER) || 2749 arp->ar_pro != htons(ETH_P_IP) || 2750 arp->ar_pln != 4) 2751 goto out_unlock; 2752 2753 arp_ptr = (unsigned char *)(arp + 1); 2754 arp_ptr += bond->dev->addr_len; 2755 memcpy(&sip, arp_ptr, 4); 2756 arp_ptr += 4 + bond->dev->addr_len; 2757 memcpy(&tip, arp_ptr, 4); 2758 2759 pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n", 2760 bond->dev->name, slave->dev->name, bond_slave_state(slave), 2761 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 2762 &sip, &tip); 2763 2764 /* 2765 * Backup slaves won't see the ARP reply, but do come through 2766 * here for each ARP probe (so we swap the sip/tip to validate 2767 * the probe). In a "redundant switch, common router" type of 2768 * configuration, the ARP probe will (hopefully) travel from 2769 * the active, through one switch, the router, then the other 2770 * switch before reaching the backup. 2771 */ 2772 if (bond_is_active_slave(slave)) 2773 bond_validate_arp(bond, slave, sip, tip); 2774 else 2775 bond_validate_arp(bond, slave, tip, sip); 2776 2777 out_unlock: 2778 read_unlock(&bond->lock); 2779 } 2780 2781 /* 2782 * this function is called regularly to monitor each slave's link 2783 * ensuring that traffic is being sent and received when arp monitoring 2784 * is used in load-balancing mode. if the adapter has been dormant, then an 2785 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 2786 * arp monitoring in active backup mode. 2787 */ 2788 void bond_loadbalance_arp_mon(struct work_struct *work) 2789 { 2790 struct bonding *bond = container_of(work, struct bonding, 2791 arp_work.work); 2792 struct slave *slave, *oldcurrent; 2793 int do_failover = 0; 2794 int delta_in_ticks; 2795 int i; 2796 2797 read_lock(&bond->lock); 2798 2799 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2800 2801 if (bond->slave_cnt == 0) 2802 goto re_arm; 2803 2804 read_lock(&bond->curr_slave_lock); 2805 oldcurrent = bond->curr_active_slave; 2806 read_unlock(&bond->curr_slave_lock); 2807 2808 /* see if any of the previous devices are up now (i.e. they have 2809 * xmt and rcv traffic). the curr_active_slave does not come into 2810 * the picture unless it is null. also, slave->jiffies is not needed 2811 * here because we send an arp on each slave and give a slave as 2812 * long as it needs to get the tx/rx within the delta. 2813 * TODO: what about up/down delay in arp mode? it wasn't here before 2814 * so it can wait 2815 */ 2816 bond_for_each_slave(bond, slave, i) { 2817 unsigned long trans_start = dev_trans_start(slave->dev); 2818 2819 if (slave->link != BOND_LINK_UP) { 2820 if (time_in_range(jiffies, 2821 trans_start - delta_in_ticks, 2822 trans_start + delta_in_ticks) && 2823 time_in_range(jiffies, 2824 slave->dev->last_rx - delta_in_ticks, 2825 slave->dev->last_rx + delta_in_ticks)) { 2826 2827 slave->link = BOND_LINK_UP; 2828 bond_set_active_slave(slave); 2829 2830 /* primary_slave has no meaning in round-robin 2831 * mode. the window of a slave being up and 2832 * curr_active_slave being null after enslaving 2833 * is closed. 2834 */ 2835 if (!oldcurrent) { 2836 pr_info("%s: link status definitely up for interface %s, ", 2837 bond->dev->name, 2838 slave->dev->name); 2839 do_failover = 1; 2840 } else { 2841 pr_info("%s: interface %s is now up\n", 2842 bond->dev->name, 2843 slave->dev->name); 2844 } 2845 } 2846 } else { 2847 /* slave->link == BOND_LINK_UP */ 2848 2849 /* not all switches will respond to an arp request 2850 * when the source ip is 0, so don't take the link down 2851 * if we don't know our ip yet 2852 */ 2853 if (!time_in_range(jiffies, 2854 trans_start - delta_in_ticks, 2855 trans_start + 2 * delta_in_ticks) || 2856 !time_in_range(jiffies, 2857 slave->dev->last_rx - delta_in_ticks, 2858 slave->dev->last_rx + 2 * delta_in_ticks)) { 2859 2860 slave->link = BOND_LINK_DOWN; 2861 bond_set_backup_slave(slave); 2862 2863 if (slave->link_failure_count < UINT_MAX) 2864 slave->link_failure_count++; 2865 2866 pr_info("%s: interface %s is now down.\n", 2867 bond->dev->name, 2868 slave->dev->name); 2869 2870 if (slave == oldcurrent) 2871 do_failover = 1; 2872 } 2873 } 2874 2875 /* note: if switch is in round-robin mode, all links 2876 * must tx arp to ensure all links rx an arp - otherwise 2877 * links may oscillate or not come up at all; if switch is 2878 * in something like xor mode, there is nothing we can 2879 * do - all replies will be rx'ed on same link causing slaves 2880 * to be unstable during low/no traffic periods 2881 */ 2882 if (IS_UP(slave->dev)) 2883 bond_arp_send_all(bond, slave); 2884 } 2885 2886 if (do_failover) { 2887 block_netpoll_tx(); 2888 write_lock_bh(&bond->curr_slave_lock); 2889 2890 bond_select_active_slave(bond); 2891 2892 write_unlock_bh(&bond->curr_slave_lock); 2893 unblock_netpoll_tx(); 2894 } 2895 2896 re_arm: 2897 if (bond->params.arp_interval) 2898 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 2899 2900 read_unlock(&bond->lock); 2901 } 2902 2903 /* 2904 * Called to inspect slaves for active-backup mode ARP monitor link state 2905 * changes. Sets new_link in slaves to specify what action should take 2906 * place for the slave. Returns 0 if no changes are found, >0 if changes 2907 * to link states must be committed. 2908 * 2909 * Called with bond->lock held for read. 2910 */ 2911 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks) 2912 { 2913 struct slave *slave; 2914 int i, commit = 0; 2915 unsigned long trans_start; 2916 2917 bond_for_each_slave(bond, slave, i) { 2918 slave->new_link = BOND_LINK_NOCHANGE; 2919 2920 if (slave->link != BOND_LINK_UP) { 2921 if (time_in_range(jiffies, 2922 slave_last_rx(bond, slave) - delta_in_ticks, 2923 slave_last_rx(bond, slave) + delta_in_ticks)) { 2924 2925 slave->new_link = BOND_LINK_UP; 2926 commit++; 2927 } 2928 2929 continue; 2930 } 2931 2932 /* 2933 * Give slaves 2*delta after being enslaved or made 2934 * active. This avoids bouncing, as the last receive 2935 * times need a full ARP monitor cycle to be updated. 2936 */ 2937 if (time_in_range(jiffies, 2938 slave->jiffies - delta_in_ticks, 2939 slave->jiffies + 2 * delta_in_ticks)) 2940 continue; 2941 2942 /* 2943 * Backup slave is down if: 2944 * - No current_arp_slave AND 2945 * - more than 3*delta since last receive AND 2946 * - the bond has an IP address 2947 * 2948 * Note: a non-null current_arp_slave indicates 2949 * the curr_active_slave went down and we are 2950 * searching for a new one; under this condition 2951 * we only take the curr_active_slave down - this 2952 * gives each slave a chance to tx/rx traffic 2953 * before being taken out 2954 */ 2955 if (!bond_is_active_slave(slave) && 2956 !bond->current_arp_slave && 2957 !time_in_range(jiffies, 2958 slave_last_rx(bond, slave) - delta_in_ticks, 2959 slave_last_rx(bond, slave) + 3 * delta_in_ticks)) { 2960 2961 slave->new_link = BOND_LINK_DOWN; 2962 commit++; 2963 } 2964 2965 /* 2966 * Active slave is down if: 2967 * - more than 2*delta since transmitting OR 2968 * - (more than 2*delta since receive AND 2969 * the bond has an IP address) 2970 */ 2971 trans_start = dev_trans_start(slave->dev); 2972 if (bond_is_active_slave(slave) && 2973 (!time_in_range(jiffies, 2974 trans_start - delta_in_ticks, 2975 trans_start + 2 * delta_in_ticks) || 2976 !time_in_range(jiffies, 2977 slave_last_rx(bond, slave) - delta_in_ticks, 2978 slave_last_rx(bond, slave) + 2 * delta_in_ticks))) { 2979 2980 slave->new_link = BOND_LINK_DOWN; 2981 commit++; 2982 } 2983 } 2984 2985 return commit; 2986 } 2987 2988 /* 2989 * Called to commit link state changes noted by inspection step of 2990 * active-backup mode ARP monitor. 2991 * 2992 * Called with RTNL and bond->lock for read. 2993 */ 2994 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks) 2995 { 2996 struct slave *slave; 2997 int i; 2998 unsigned long trans_start; 2999 3000 bond_for_each_slave(bond, slave, i) { 3001 switch (slave->new_link) { 3002 case BOND_LINK_NOCHANGE: 3003 continue; 3004 3005 case BOND_LINK_UP: 3006 trans_start = dev_trans_start(slave->dev); 3007 if ((!bond->curr_active_slave && 3008 time_in_range(jiffies, 3009 trans_start - delta_in_ticks, 3010 trans_start + delta_in_ticks)) || 3011 bond->curr_active_slave != slave) { 3012 slave->link = BOND_LINK_UP; 3013 if (bond->current_arp_slave) { 3014 bond_set_slave_inactive_flags( 3015 bond->current_arp_slave); 3016 bond->current_arp_slave = NULL; 3017 } 3018 3019 pr_info("%s: link status definitely up for interface %s.\n", 3020 bond->dev->name, slave->dev->name); 3021 3022 if (!bond->curr_active_slave || 3023 (slave == bond->primary_slave)) 3024 goto do_failover; 3025 3026 } 3027 3028 continue; 3029 3030 case BOND_LINK_DOWN: 3031 if (slave->link_failure_count < UINT_MAX) 3032 slave->link_failure_count++; 3033 3034 slave->link = BOND_LINK_DOWN; 3035 bond_set_slave_inactive_flags(slave); 3036 3037 pr_info("%s: link status definitely down for interface %s, disabling it\n", 3038 bond->dev->name, slave->dev->name); 3039 3040 if (slave == bond->curr_active_slave) { 3041 bond->current_arp_slave = NULL; 3042 goto do_failover; 3043 } 3044 3045 continue; 3046 3047 default: 3048 pr_err("%s: impossible: new_link %d on slave %s\n", 3049 bond->dev->name, slave->new_link, 3050 slave->dev->name); 3051 continue; 3052 } 3053 3054 do_failover: 3055 ASSERT_RTNL(); 3056 block_netpoll_tx(); 3057 write_lock_bh(&bond->curr_slave_lock); 3058 bond_select_active_slave(bond); 3059 write_unlock_bh(&bond->curr_slave_lock); 3060 unblock_netpoll_tx(); 3061 } 3062 3063 bond_set_carrier(bond); 3064 } 3065 3066 /* 3067 * Send ARP probes for active-backup mode ARP monitor. 3068 * 3069 * Called with bond->lock held for read. 3070 */ 3071 static void bond_ab_arp_probe(struct bonding *bond) 3072 { 3073 struct slave *slave; 3074 int i; 3075 3076 read_lock(&bond->curr_slave_lock); 3077 3078 if (bond->current_arp_slave && bond->curr_active_slave) 3079 pr_info("PROBE: c_arp %s && cas %s BAD\n", 3080 bond->current_arp_slave->dev->name, 3081 bond->curr_active_slave->dev->name); 3082 3083 if (bond->curr_active_slave) { 3084 bond_arp_send_all(bond, bond->curr_active_slave); 3085 read_unlock(&bond->curr_slave_lock); 3086 return; 3087 } 3088 3089 read_unlock(&bond->curr_slave_lock); 3090 3091 /* if we don't have a curr_active_slave, search for the next available 3092 * backup slave from the current_arp_slave and make it the candidate 3093 * for becoming the curr_active_slave 3094 */ 3095 3096 if (!bond->current_arp_slave) { 3097 bond->current_arp_slave = bond->first_slave; 3098 if (!bond->current_arp_slave) 3099 return; 3100 } 3101 3102 bond_set_slave_inactive_flags(bond->current_arp_slave); 3103 3104 /* search for next candidate */ 3105 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) { 3106 if (IS_UP(slave->dev)) { 3107 slave->link = BOND_LINK_BACK; 3108 bond_set_slave_active_flags(slave); 3109 bond_arp_send_all(bond, slave); 3110 slave->jiffies = jiffies; 3111 bond->current_arp_slave = slave; 3112 break; 3113 } 3114 3115 /* if the link state is up at this point, we 3116 * mark it down - this can happen if we have 3117 * simultaneous link failures and 3118 * reselect_active_interface doesn't make this 3119 * one the current slave so it is still marked 3120 * up when it is actually down 3121 */ 3122 if (slave->link == BOND_LINK_UP) { 3123 slave->link = BOND_LINK_DOWN; 3124 if (slave->link_failure_count < UINT_MAX) 3125 slave->link_failure_count++; 3126 3127 bond_set_slave_inactive_flags(slave); 3128 3129 pr_info("%s: backup interface %s is now down.\n", 3130 bond->dev->name, slave->dev->name); 3131 } 3132 } 3133 } 3134 3135 void bond_activebackup_arp_mon(struct work_struct *work) 3136 { 3137 struct bonding *bond = container_of(work, struct bonding, 3138 arp_work.work); 3139 bool should_notify_peers = false; 3140 int delta_in_ticks; 3141 3142 read_lock(&bond->lock); 3143 3144 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3145 3146 if (bond->slave_cnt == 0) 3147 goto re_arm; 3148 3149 should_notify_peers = bond_should_notify_peers(bond); 3150 3151 if (bond_ab_arp_inspect(bond, delta_in_ticks)) { 3152 read_unlock(&bond->lock); 3153 3154 /* Race avoidance with bond_close flush of workqueue */ 3155 if (!rtnl_trylock()) { 3156 read_lock(&bond->lock); 3157 delta_in_ticks = 1; 3158 should_notify_peers = false; 3159 goto re_arm; 3160 } 3161 3162 read_lock(&bond->lock); 3163 3164 bond_ab_arp_commit(bond, delta_in_ticks); 3165 3166 read_unlock(&bond->lock); 3167 rtnl_unlock(); 3168 read_lock(&bond->lock); 3169 } 3170 3171 bond_ab_arp_probe(bond); 3172 3173 re_arm: 3174 if (bond->params.arp_interval) 3175 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 3176 3177 read_unlock(&bond->lock); 3178 3179 if (should_notify_peers) { 3180 if (!rtnl_trylock()) { 3181 read_lock(&bond->lock); 3182 bond->send_peer_notif++; 3183 read_unlock(&bond->lock); 3184 return; 3185 } 3186 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS); 3187 rtnl_unlock(); 3188 } 3189 } 3190 3191 /*-------------------------- netdev event handling --------------------------*/ 3192 3193 /* 3194 * Change device name 3195 */ 3196 static int bond_event_changename(struct bonding *bond) 3197 { 3198 bond_remove_proc_entry(bond); 3199 bond_create_proc_entry(bond); 3200 3201 bond_debug_reregister(bond); 3202 3203 return NOTIFY_DONE; 3204 } 3205 3206 static int bond_master_netdev_event(unsigned long event, 3207 struct net_device *bond_dev) 3208 { 3209 struct bonding *event_bond = netdev_priv(bond_dev); 3210 3211 switch (event) { 3212 case NETDEV_CHANGENAME: 3213 return bond_event_changename(event_bond); 3214 default: 3215 break; 3216 } 3217 3218 return NOTIFY_DONE; 3219 } 3220 3221 static int bond_slave_netdev_event(unsigned long event, 3222 struct net_device *slave_dev) 3223 { 3224 struct net_device *bond_dev = slave_dev->master; 3225 struct bonding *bond = netdev_priv(bond_dev); 3226 struct slave *slave = NULL; 3227 3228 switch (event) { 3229 case NETDEV_UNREGISTER: 3230 if (bond_dev) { 3231 if (bond->setup_by_slave) 3232 bond_release_and_destroy(bond_dev, slave_dev); 3233 else 3234 bond_release(bond_dev, slave_dev); 3235 } 3236 break; 3237 case NETDEV_UP: 3238 case NETDEV_CHANGE: 3239 slave = bond_get_slave_by_dev(bond, slave_dev); 3240 if (slave) { 3241 u32 old_speed = slave->speed; 3242 u8 old_duplex = slave->duplex; 3243 3244 bond_update_speed_duplex(slave); 3245 3246 if (bond->params.mode == BOND_MODE_8023AD) { 3247 if (old_speed != slave->speed) 3248 bond_3ad_adapter_speed_changed(slave); 3249 if (old_duplex != slave->duplex) 3250 bond_3ad_adapter_duplex_changed(slave); 3251 } 3252 } 3253 3254 break; 3255 case NETDEV_DOWN: 3256 /* 3257 * ... Or is it this? 3258 */ 3259 break; 3260 case NETDEV_CHANGEMTU: 3261 /* 3262 * TODO: Should slaves be allowed to 3263 * independently alter their MTU? For 3264 * an active-backup bond, slaves need 3265 * not be the same type of device, so 3266 * MTUs may vary. For other modes, 3267 * slaves arguably should have the 3268 * same MTUs. To do this, we'd need to 3269 * take over the slave's change_mtu 3270 * function for the duration of their 3271 * servitude. 3272 */ 3273 break; 3274 case NETDEV_CHANGENAME: 3275 /* 3276 * TODO: handle changing the primary's name 3277 */ 3278 break; 3279 case NETDEV_FEAT_CHANGE: 3280 bond_compute_features(bond); 3281 break; 3282 default: 3283 break; 3284 } 3285 3286 return NOTIFY_DONE; 3287 } 3288 3289 /* 3290 * bond_netdev_event: handle netdev notifier chain events. 3291 * 3292 * This function receives events for the netdev chain. The caller (an 3293 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 3294 * locks for us to safely manipulate the slave devices (RTNL lock, 3295 * dev_probe_lock). 3296 */ 3297 static int bond_netdev_event(struct notifier_block *this, 3298 unsigned long event, void *ptr) 3299 { 3300 struct net_device *event_dev = (struct net_device *)ptr; 3301 3302 pr_debug("event_dev: %s, event: %lx\n", 3303 event_dev ? event_dev->name : "None", 3304 event); 3305 3306 if (!(event_dev->priv_flags & IFF_BONDING)) 3307 return NOTIFY_DONE; 3308 3309 if (event_dev->flags & IFF_MASTER) { 3310 pr_debug("IFF_MASTER\n"); 3311 return bond_master_netdev_event(event, event_dev); 3312 } 3313 3314 if (event_dev->flags & IFF_SLAVE) { 3315 pr_debug("IFF_SLAVE\n"); 3316 return bond_slave_netdev_event(event, event_dev); 3317 } 3318 3319 return NOTIFY_DONE; 3320 } 3321 3322 static struct notifier_block bond_netdev_notifier = { 3323 .notifier_call = bond_netdev_event, 3324 }; 3325 3326 /*---------------------------- Hashing Policies -----------------------------*/ 3327 3328 /* 3329 * Hash for the output device based upon layer 2 and layer 3 data. If 3330 * the packet is not IP mimic bond_xmit_hash_policy_l2() 3331 */ 3332 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count) 3333 { 3334 struct ethhdr *data = (struct ethhdr *)skb->data; 3335 struct iphdr *iph = ip_hdr(skb); 3336 3337 if (skb->protocol == htons(ETH_P_IP)) { 3338 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^ 3339 (data->h_dest[5] ^ data->h_source[5])) % count; 3340 } 3341 3342 return (data->h_dest[5] ^ data->h_source[5]) % count; 3343 } 3344 3345 /* 3346 * Hash for the output device based upon layer 3 and layer 4 data. If 3347 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is 3348 * altogether not IP, mimic bond_xmit_hash_policy_l2() 3349 */ 3350 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count) 3351 { 3352 struct ethhdr *data = (struct ethhdr *)skb->data; 3353 struct iphdr *iph = ip_hdr(skb); 3354 __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl); 3355 int layer4_xor = 0; 3356 3357 if (skb->protocol == htons(ETH_P_IP)) { 3358 if (!ip_is_fragment(iph) && 3359 (iph->protocol == IPPROTO_TCP || 3360 iph->protocol == IPPROTO_UDP)) { 3361 layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1))); 3362 } 3363 return (layer4_xor ^ 3364 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count; 3365 3366 } 3367 3368 return (data->h_dest[5] ^ data->h_source[5]) % count; 3369 } 3370 3371 /* 3372 * Hash for the output device based upon layer 2 data 3373 */ 3374 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count) 3375 { 3376 struct ethhdr *data = (struct ethhdr *)skb->data; 3377 3378 return (data->h_dest[5] ^ data->h_source[5]) % count; 3379 } 3380 3381 /*-------------------------- Device entry points ----------------------------*/ 3382 3383 static int bond_open(struct net_device *bond_dev) 3384 { 3385 struct bonding *bond = netdev_priv(bond_dev); 3386 struct slave *slave; 3387 int i; 3388 3389 /* reset slave->backup and slave->inactive */ 3390 read_lock(&bond->lock); 3391 if (bond->slave_cnt > 0) { 3392 read_lock(&bond->curr_slave_lock); 3393 bond_for_each_slave(bond, slave, i) { 3394 if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) 3395 && (slave != bond->curr_active_slave)) { 3396 bond_set_slave_inactive_flags(slave); 3397 } else { 3398 bond_set_slave_active_flags(slave); 3399 } 3400 } 3401 read_unlock(&bond->curr_slave_lock); 3402 } 3403 read_unlock(&bond->lock); 3404 3405 INIT_DELAYED_WORK(&bond->mcast_work, bond_resend_igmp_join_requests_delayed); 3406 3407 if (bond_is_lb(bond)) { 3408 /* bond_alb_initialize must be called before the timer 3409 * is started. 3410 */ 3411 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) { 3412 /* something went wrong - fail the open operation */ 3413 return -ENOMEM; 3414 } 3415 3416 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 3417 queue_delayed_work(bond->wq, &bond->alb_work, 0); 3418 } 3419 3420 if (bond->params.miimon) { /* link check interval, in milliseconds. */ 3421 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 3422 queue_delayed_work(bond->wq, &bond->mii_work, 0); 3423 } 3424 3425 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 3426 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) 3427 INIT_DELAYED_WORK(&bond->arp_work, 3428 bond_activebackup_arp_mon); 3429 else 3430 INIT_DELAYED_WORK(&bond->arp_work, 3431 bond_loadbalance_arp_mon); 3432 3433 queue_delayed_work(bond->wq, &bond->arp_work, 0); 3434 if (bond->params.arp_validate) 3435 bond->recv_probe = bond_arp_rcv; 3436 } 3437 3438 if (bond->params.mode == BOND_MODE_8023AD) { 3439 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 3440 queue_delayed_work(bond->wq, &bond->ad_work, 0); 3441 /* register to receive LACPDUs */ 3442 bond->recv_probe = bond_3ad_lacpdu_recv; 3443 bond_3ad_initiate_agg_selection(bond, 1); 3444 } 3445 3446 return 0; 3447 } 3448 3449 static int bond_close(struct net_device *bond_dev) 3450 { 3451 struct bonding *bond = netdev_priv(bond_dev); 3452 3453 write_lock_bh(&bond->lock); 3454 3455 bond->send_peer_notif = 0; 3456 3457 write_unlock_bh(&bond->lock); 3458 3459 if (bond->params.miimon) { /* link check interval, in milliseconds. */ 3460 cancel_delayed_work_sync(&bond->mii_work); 3461 } 3462 3463 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 3464 cancel_delayed_work_sync(&bond->arp_work); 3465 } 3466 3467 switch (bond->params.mode) { 3468 case BOND_MODE_8023AD: 3469 cancel_delayed_work_sync(&bond->ad_work); 3470 break; 3471 case BOND_MODE_TLB: 3472 case BOND_MODE_ALB: 3473 cancel_delayed_work_sync(&bond->alb_work); 3474 break; 3475 default: 3476 break; 3477 } 3478 3479 if (delayed_work_pending(&bond->mcast_work)) 3480 cancel_delayed_work_sync(&bond->mcast_work); 3481 3482 if (bond_is_lb(bond)) { 3483 /* Must be called only after all 3484 * slaves have been released 3485 */ 3486 bond_alb_deinitialize(bond); 3487 } 3488 bond->recv_probe = NULL; 3489 3490 return 0; 3491 } 3492 3493 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev, 3494 struct rtnl_link_stats64 *stats) 3495 { 3496 struct bonding *bond = netdev_priv(bond_dev); 3497 struct rtnl_link_stats64 temp; 3498 struct slave *slave; 3499 int i; 3500 3501 memset(stats, 0, sizeof(*stats)); 3502 3503 read_lock_bh(&bond->lock); 3504 3505 bond_for_each_slave(bond, slave, i) { 3506 const struct rtnl_link_stats64 *sstats = 3507 dev_get_stats(slave->dev, &temp); 3508 3509 stats->rx_packets += sstats->rx_packets; 3510 stats->rx_bytes += sstats->rx_bytes; 3511 stats->rx_errors += sstats->rx_errors; 3512 stats->rx_dropped += sstats->rx_dropped; 3513 3514 stats->tx_packets += sstats->tx_packets; 3515 stats->tx_bytes += sstats->tx_bytes; 3516 stats->tx_errors += sstats->tx_errors; 3517 stats->tx_dropped += sstats->tx_dropped; 3518 3519 stats->multicast += sstats->multicast; 3520 stats->collisions += sstats->collisions; 3521 3522 stats->rx_length_errors += sstats->rx_length_errors; 3523 stats->rx_over_errors += sstats->rx_over_errors; 3524 stats->rx_crc_errors += sstats->rx_crc_errors; 3525 stats->rx_frame_errors += sstats->rx_frame_errors; 3526 stats->rx_fifo_errors += sstats->rx_fifo_errors; 3527 stats->rx_missed_errors += sstats->rx_missed_errors; 3528 3529 stats->tx_aborted_errors += sstats->tx_aborted_errors; 3530 stats->tx_carrier_errors += sstats->tx_carrier_errors; 3531 stats->tx_fifo_errors += sstats->tx_fifo_errors; 3532 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors; 3533 stats->tx_window_errors += sstats->tx_window_errors; 3534 } 3535 3536 read_unlock_bh(&bond->lock); 3537 3538 return stats; 3539 } 3540 3541 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 3542 { 3543 struct net_device *slave_dev = NULL; 3544 struct ifbond k_binfo; 3545 struct ifbond __user *u_binfo = NULL; 3546 struct ifslave k_sinfo; 3547 struct ifslave __user *u_sinfo = NULL; 3548 struct mii_ioctl_data *mii = NULL; 3549 int res = 0; 3550 3551 pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd); 3552 3553 switch (cmd) { 3554 case SIOCGMIIPHY: 3555 mii = if_mii(ifr); 3556 if (!mii) 3557 return -EINVAL; 3558 3559 mii->phy_id = 0; 3560 /* Fall Through */ 3561 case SIOCGMIIREG: 3562 /* 3563 * We do this again just in case we were called by SIOCGMIIREG 3564 * instead of SIOCGMIIPHY. 3565 */ 3566 mii = if_mii(ifr); 3567 if (!mii) 3568 return -EINVAL; 3569 3570 3571 if (mii->reg_num == 1) { 3572 struct bonding *bond = netdev_priv(bond_dev); 3573 mii->val_out = 0; 3574 read_lock(&bond->lock); 3575 read_lock(&bond->curr_slave_lock); 3576 if (netif_carrier_ok(bond->dev)) 3577 mii->val_out = BMSR_LSTATUS; 3578 3579 read_unlock(&bond->curr_slave_lock); 3580 read_unlock(&bond->lock); 3581 } 3582 3583 return 0; 3584 case BOND_INFO_QUERY_OLD: 3585 case SIOCBONDINFOQUERY: 3586 u_binfo = (struct ifbond __user *)ifr->ifr_data; 3587 3588 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 3589 return -EFAULT; 3590 3591 res = bond_info_query(bond_dev, &k_binfo); 3592 if (res == 0 && 3593 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 3594 return -EFAULT; 3595 3596 return res; 3597 case BOND_SLAVE_INFO_QUERY_OLD: 3598 case SIOCBONDSLAVEINFOQUERY: 3599 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 3600 3601 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 3602 return -EFAULT; 3603 3604 res = bond_slave_info_query(bond_dev, &k_sinfo); 3605 if (res == 0 && 3606 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 3607 return -EFAULT; 3608 3609 return res; 3610 default: 3611 /* Go on */ 3612 break; 3613 } 3614 3615 if (!capable(CAP_NET_ADMIN)) 3616 return -EPERM; 3617 3618 slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave); 3619 3620 pr_debug("slave_dev=%p:\n", slave_dev); 3621 3622 if (!slave_dev) 3623 res = -ENODEV; 3624 else { 3625 pr_debug("slave_dev->name=%s:\n", slave_dev->name); 3626 switch (cmd) { 3627 case BOND_ENSLAVE_OLD: 3628 case SIOCBONDENSLAVE: 3629 res = bond_enslave(bond_dev, slave_dev); 3630 break; 3631 case BOND_RELEASE_OLD: 3632 case SIOCBONDRELEASE: 3633 res = bond_release(bond_dev, slave_dev); 3634 break; 3635 case BOND_SETHWADDR_OLD: 3636 case SIOCBONDSETHWADDR: 3637 res = bond_sethwaddr(bond_dev, slave_dev); 3638 break; 3639 case BOND_CHANGE_ACTIVE_OLD: 3640 case SIOCBONDCHANGEACTIVE: 3641 res = bond_ioctl_change_active(bond_dev, slave_dev); 3642 break; 3643 default: 3644 res = -EOPNOTSUPP; 3645 } 3646 3647 dev_put(slave_dev); 3648 } 3649 3650 return res; 3651 } 3652 3653 static bool bond_addr_in_mc_list(unsigned char *addr, 3654 struct netdev_hw_addr_list *list, 3655 int addrlen) 3656 { 3657 struct netdev_hw_addr *ha; 3658 3659 netdev_hw_addr_list_for_each(ha, list) 3660 if (!memcmp(ha->addr, addr, addrlen)) 3661 return true; 3662 3663 return false; 3664 } 3665 3666 static void bond_change_rx_flags(struct net_device *bond_dev, int change) 3667 { 3668 struct bonding *bond = netdev_priv(bond_dev); 3669 3670 if (change & IFF_PROMISC) 3671 bond_set_promiscuity(bond, 3672 bond_dev->flags & IFF_PROMISC ? 1 : -1); 3673 3674 if (change & IFF_ALLMULTI) 3675 bond_set_allmulti(bond, 3676 bond_dev->flags & IFF_ALLMULTI ? 1 : -1); 3677 } 3678 3679 static void bond_set_multicast_list(struct net_device *bond_dev) 3680 { 3681 struct bonding *bond = netdev_priv(bond_dev); 3682 struct netdev_hw_addr *ha; 3683 bool found; 3684 3685 read_lock(&bond->lock); 3686 3687 /* looking for addresses to add to slaves' mc list */ 3688 netdev_for_each_mc_addr(ha, bond_dev) { 3689 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list, 3690 bond_dev->addr_len); 3691 if (!found) 3692 bond_mc_add(bond, ha->addr); 3693 } 3694 3695 /* looking for addresses to delete from slaves' list */ 3696 netdev_hw_addr_list_for_each(ha, &bond->mc_list) { 3697 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc, 3698 bond_dev->addr_len); 3699 if (!found) 3700 bond_mc_del(bond, ha->addr); 3701 } 3702 3703 /* save master's multicast list */ 3704 __hw_addr_flush(&bond->mc_list); 3705 __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc, 3706 bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST); 3707 3708 read_unlock(&bond->lock); 3709 } 3710 3711 static int bond_neigh_init(struct neighbour *n) 3712 { 3713 struct bonding *bond = netdev_priv(n->dev); 3714 struct slave *slave = bond->first_slave; 3715 const struct net_device_ops *slave_ops; 3716 struct neigh_parms parms; 3717 int ret; 3718 3719 if (!slave) 3720 return 0; 3721 3722 slave_ops = slave->dev->netdev_ops; 3723 3724 if (!slave_ops->ndo_neigh_setup) 3725 return 0; 3726 3727 parms.neigh_setup = NULL; 3728 parms.neigh_cleanup = NULL; 3729 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); 3730 if (ret) 3731 return ret; 3732 3733 /* 3734 * Assign slave's neigh_cleanup to neighbour in case cleanup is called 3735 * after the last slave has been detached. Assumes that all slaves 3736 * utilize the same neigh_cleanup (true at this writing as only user 3737 * is ipoib). 3738 */ 3739 n->parms->neigh_cleanup = parms.neigh_cleanup; 3740 3741 if (!parms.neigh_setup) 3742 return 0; 3743 3744 return parms.neigh_setup(n); 3745 } 3746 3747 /* 3748 * The bonding ndo_neigh_setup is called at init time beofre any 3749 * slave exists. So we must declare proxy setup function which will 3750 * be used at run time to resolve the actual slave neigh param setup. 3751 */ 3752 static int bond_neigh_setup(struct net_device *dev, 3753 struct neigh_parms *parms) 3754 { 3755 parms->neigh_setup = bond_neigh_init; 3756 3757 return 0; 3758 } 3759 3760 /* 3761 * Change the MTU of all of a master's slaves to match the master 3762 */ 3763 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 3764 { 3765 struct bonding *bond = netdev_priv(bond_dev); 3766 struct slave *slave, *stop_at; 3767 int res = 0; 3768 int i; 3769 3770 pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond, 3771 (bond_dev ? bond_dev->name : "None"), new_mtu); 3772 3773 /* Can't hold bond->lock with bh disabled here since 3774 * some base drivers panic. On the other hand we can't 3775 * hold bond->lock without bh disabled because we'll 3776 * deadlock. The only solution is to rely on the fact 3777 * that we're under rtnl_lock here, and the slaves 3778 * list won't change. This doesn't solve the problem 3779 * of setting the slave's MTU while it is 3780 * transmitting, but the assumption is that the base 3781 * driver can handle that. 3782 * 3783 * TODO: figure out a way to safely iterate the slaves 3784 * list, but without holding a lock around the actual 3785 * call to the base driver. 3786 */ 3787 3788 bond_for_each_slave(bond, slave, i) { 3789 pr_debug("s %p s->p %p c_m %p\n", 3790 slave, 3791 slave->prev, 3792 slave->dev->netdev_ops->ndo_change_mtu); 3793 3794 res = dev_set_mtu(slave->dev, new_mtu); 3795 3796 if (res) { 3797 /* If we failed to set the slave's mtu to the new value 3798 * we must abort the operation even in ACTIVE_BACKUP 3799 * mode, because if we allow the backup slaves to have 3800 * different mtu values than the active slave we'll 3801 * need to change their mtu when doing a failover. That 3802 * means changing their mtu from timer context, which 3803 * is probably not a good idea. 3804 */ 3805 pr_debug("err %d %s\n", res, slave->dev->name); 3806 goto unwind; 3807 } 3808 } 3809 3810 bond_dev->mtu = new_mtu; 3811 3812 return 0; 3813 3814 unwind: 3815 /* unwind from head to the slave that failed */ 3816 stop_at = slave; 3817 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { 3818 int tmp_res; 3819 3820 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu); 3821 if (tmp_res) { 3822 pr_debug("unwind err %d dev %s\n", 3823 tmp_res, slave->dev->name); 3824 } 3825 } 3826 3827 return res; 3828 } 3829 3830 /* 3831 * Change HW address 3832 * 3833 * Note that many devices must be down to change the HW address, and 3834 * downing the master releases all slaves. We can make bonds full of 3835 * bonding devices to test this, however. 3836 */ 3837 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 3838 { 3839 struct bonding *bond = netdev_priv(bond_dev); 3840 struct sockaddr *sa = addr, tmp_sa; 3841 struct slave *slave, *stop_at; 3842 int res = 0; 3843 int i; 3844 3845 if (bond->params.mode == BOND_MODE_ALB) 3846 return bond_alb_set_mac_address(bond_dev, addr); 3847 3848 3849 pr_debug("bond=%p, name=%s\n", 3850 bond, bond_dev ? bond_dev->name : "None"); 3851 3852 /* 3853 * If fail_over_mac is set to active, do nothing and return 3854 * success. Returning an error causes ifenslave to fail. 3855 */ 3856 if (bond->params.fail_over_mac == BOND_FOM_ACTIVE) 3857 return 0; 3858 3859 if (!is_valid_ether_addr(sa->sa_data)) 3860 return -EADDRNOTAVAIL; 3861 3862 /* Can't hold bond->lock with bh disabled here since 3863 * some base drivers panic. On the other hand we can't 3864 * hold bond->lock without bh disabled because we'll 3865 * deadlock. The only solution is to rely on the fact 3866 * that we're under rtnl_lock here, and the slaves 3867 * list won't change. This doesn't solve the problem 3868 * of setting the slave's hw address while it is 3869 * transmitting, but the assumption is that the base 3870 * driver can handle that. 3871 * 3872 * TODO: figure out a way to safely iterate the slaves 3873 * list, but without holding a lock around the actual 3874 * call to the base driver. 3875 */ 3876 3877 bond_for_each_slave(bond, slave, i) { 3878 const struct net_device_ops *slave_ops = slave->dev->netdev_ops; 3879 pr_debug("slave %p %s\n", slave, slave->dev->name); 3880 3881 if (slave_ops->ndo_set_mac_address == NULL) { 3882 res = -EOPNOTSUPP; 3883 pr_debug("EOPNOTSUPP %s\n", slave->dev->name); 3884 goto unwind; 3885 } 3886 3887 res = dev_set_mac_address(slave->dev, addr); 3888 if (res) { 3889 /* TODO: consider downing the slave 3890 * and retry ? 3891 * User should expect communications 3892 * breakage anyway until ARP finish 3893 * updating, so... 3894 */ 3895 pr_debug("err %d %s\n", res, slave->dev->name); 3896 goto unwind; 3897 } 3898 } 3899 3900 /* success */ 3901 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); 3902 return 0; 3903 3904 unwind: 3905 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 3906 tmp_sa.sa_family = bond_dev->type; 3907 3908 /* unwind from head to the slave that failed */ 3909 stop_at = slave; 3910 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { 3911 int tmp_res; 3912 3913 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa); 3914 if (tmp_res) { 3915 pr_debug("unwind err %d dev %s\n", 3916 tmp_res, slave->dev->name); 3917 } 3918 } 3919 3920 return res; 3921 } 3922 3923 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev) 3924 { 3925 struct bonding *bond = netdev_priv(bond_dev); 3926 struct slave *slave, *start_at; 3927 int i, slave_no, res = 1; 3928 struct iphdr *iph = ip_hdr(skb); 3929 3930 /* 3931 * Start with the curr_active_slave that joined the bond as the 3932 * default for sending IGMP traffic. For failover purposes one 3933 * needs to maintain some consistency for the interface that will 3934 * send the join/membership reports. The curr_active_slave found 3935 * will send all of this type of traffic. 3936 */ 3937 if ((iph->protocol == IPPROTO_IGMP) && 3938 (skb->protocol == htons(ETH_P_IP))) { 3939 3940 read_lock(&bond->curr_slave_lock); 3941 slave = bond->curr_active_slave; 3942 read_unlock(&bond->curr_slave_lock); 3943 3944 if (!slave) 3945 goto out; 3946 } else { 3947 /* 3948 * Concurrent TX may collide on rr_tx_counter; we accept 3949 * that as being rare enough not to justify using an 3950 * atomic op here. 3951 */ 3952 slave_no = bond->rr_tx_counter++ % bond->slave_cnt; 3953 3954 bond_for_each_slave(bond, slave, i) { 3955 slave_no--; 3956 if (slave_no < 0) 3957 break; 3958 } 3959 } 3960 3961 start_at = slave; 3962 bond_for_each_slave_from(bond, slave, i, start_at) { 3963 if (IS_UP(slave->dev) && 3964 (slave->link == BOND_LINK_UP) && 3965 bond_is_active_slave(slave)) { 3966 res = bond_dev_queue_xmit(bond, skb, slave->dev); 3967 break; 3968 } 3969 } 3970 3971 out: 3972 if (res) { 3973 /* no suitable interface, frame not sent */ 3974 dev_kfree_skb(skb); 3975 } 3976 3977 return NETDEV_TX_OK; 3978 } 3979 3980 3981 /* 3982 * in active-backup mode, we know that bond->curr_active_slave is always valid if 3983 * the bond has a usable interface. 3984 */ 3985 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev) 3986 { 3987 struct bonding *bond = netdev_priv(bond_dev); 3988 int res = 1; 3989 3990 read_lock(&bond->curr_slave_lock); 3991 3992 if (bond->curr_active_slave) 3993 res = bond_dev_queue_xmit(bond, skb, 3994 bond->curr_active_slave->dev); 3995 3996 if (res) 3997 /* no suitable interface, frame not sent */ 3998 dev_kfree_skb(skb); 3999 4000 read_unlock(&bond->curr_slave_lock); 4001 4002 return NETDEV_TX_OK; 4003 } 4004 4005 /* 4006 * In bond_xmit_xor() , we determine the output device by using a pre- 4007 * determined xmit_hash_policy(), If the selected device is not enabled, 4008 * find the next active slave. 4009 */ 4010 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev) 4011 { 4012 struct bonding *bond = netdev_priv(bond_dev); 4013 struct slave *slave, *start_at; 4014 int slave_no; 4015 int i; 4016 int res = 1; 4017 4018 slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt); 4019 4020 bond_for_each_slave(bond, slave, i) { 4021 slave_no--; 4022 if (slave_no < 0) 4023 break; 4024 } 4025 4026 start_at = slave; 4027 4028 bond_for_each_slave_from(bond, slave, i, start_at) { 4029 if (IS_UP(slave->dev) && 4030 (slave->link == BOND_LINK_UP) && 4031 bond_is_active_slave(slave)) { 4032 res = bond_dev_queue_xmit(bond, skb, slave->dev); 4033 break; 4034 } 4035 } 4036 4037 if (res) { 4038 /* no suitable interface, frame not sent */ 4039 dev_kfree_skb(skb); 4040 } 4041 4042 return NETDEV_TX_OK; 4043 } 4044 4045 /* 4046 * in broadcast mode, we send everything to all usable interfaces. 4047 */ 4048 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev) 4049 { 4050 struct bonding *bond = netdev_priv(bond_dev); 4051 struct slave *slave, *start_at; 4052 struct net_device *tx_dev = NULL; 4053 int i; 4054 int res = 1; 4055 4056 read_lock(&bond->curr_slave_lock); 4057 start_at = bond->curr_active_slave; 4058 read_unlock(&bond->curr_slave_lock); 4059 4060 if (!start_at) 4061 goto out; 4062 4063 bond_for_each_slave_from(bond, slave, i, start_at) { 4064 if (IS_UP(slave->dev) && 4065 (slave->link == BOND_LINK_UP) && 4066 bond_is_active_slave(slave)) { 4067 if (tx_dev) { 4068 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 4069 if (!skb2) { 4070 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n", 4071 bond_dev->name); 4072 continue; 4073 } 4074 4075 res = bond_dev_queue_xmit(bond, skb2, tx_dev); 4076 if (res) { 4077 dev_kfree_skb(skb2); 4078 continue; 4079 } 4080 } 4081 tx_dev = slave->dev; 4082 } 4083 } 4084 4085 if (tx_dev) 4086 res = bond_dev_queue_xmit(bond, skb, tx_dev); 4087 4088 out: 4089 if (res) 4090 /* no suitable interface, frame not sent */ 4091 dev_kfree_skb(skb); 4092 4093 /* frame sent to all suitable interfaces */ 4094 return NETDEV_TX_OK; 4095 } 4096 4097 /*------------------------- Device initialization ---------------------------*/ 4098 4099 static void bond_set_xmit_hash_policy(struct bonding *bond) 4100 { 4101 switch (bond->params.xmit_policy) { 4102 case BOND_XMIT_POLICY_LAYER23: 4103 bond->xmit_hash_policy = bond_xmit_hash_policy_l23; 4104 break; 4105 case BOND_XMIT_POLICY_LAYER34: 4106 bond->xmit_hash_policy = bond_xmit_hash_policy_l34; 4107 break; 4108 case BOND_XMIT_POLICY_LAYER2: 4109 default: 4110 bond->xmit_hash_policy = bond_xmit_hash_policy_l2; 4111 break; 4112 } 4113 } 4114 4115 /* 4116 * Lookup the slave that corresponds to a qid 4117 */ 4118 static inline int bond_slave_override(struct bonding *bond, 4119 struct sk_buff *skb) 4120 { 4121 int i, res = 1; 4122 struct slave *slave = NULL; 4123 struct slave *check_slave; 4124 4125 if (!skb->queue_mapping) 4126 return 1; 4127 4128 /* Find out if any slaves have the same mapping as this skb. */ 4129 bond_for_each_slave(bond, check_slave, i) { 4130 if (check_slave->queue_id == skb->queue_mapping) { 4131 slave = check_slave; 4132 break; 4133 } 4134 } 4135 4136 /* If the slave isn't UP, use default transmit policy. */ 4137 if (slave && slave->queue_id && IS_UP(slave->dev) && 4138 (slave->link == BOND_LINK_UP)) { 4139 res = bond_dev_queue_xmit(bond, skb, slave->dev); 4140 } 4141 4142 return res; 4143 } 4144 4145 4146 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb) 4147 { 4148 /* 4149 * This helper function exists to help dev_pick_tx get the correct 4150 * destination queue. Using a helper function skips a call to 4151 * skb_tx_hash and will put the skbs in the queue we expect on their 4152 * way down to the bonding driver. 4153 */ 4154 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 4155 4156 /* 4157 * Save the original txq to restore before passing to the driver 4158 */ 4159 bond_queue_mapping(skb) = skb->queue_mapping; 4160 4161 if (unlikely(txq >= dev->real_num_tx_queues)) { 4162 do { 4163 txq -= dev->real_num_tx_queues; 4164 } while (txq >= dev->real_num_tx_queues); 4165 } 4166 return txq; 4167 } 4168 4169 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4170 { 4171 struct bonding *bond = netdev_priv(dev); 4172 4173 if (TX_QUEUE_OVERRIDE(bond->params.mode)) { 4174 if (!bond_slave_override(bond, skb)) 4175 return NETDEV_TX_OK; 4176 } 4177 4178 switch (bond->params.mode) { 4179 case BOND_MODE_ROUNDROBIN: 4180 return bond_xmit_roundrobin(skb, dev); 4181 case BOND_MODE_ACTIVEBACKUP: 4182 return bond_xmit_activebackup(skb, dev); 4183 case BOND_MODE_XOR: 4184 return bond_xmit_xor(skb, dev); 4185 case BOND_MODE_BROADCAST: 4186 return bond_xmit_broadcast(skb, dev); 4187 case BOND_MODE_8023AD: 4188 return bond_3ad_xmit_xor(skb, dev); 4189 case BOND_MODE_ALB: 4190 case BOND_MODE_TLB: 4191 return bond_alb_xmit(skb, dev); 4192 default: 4193 /* Should never happen, mode already checked */ 4194 pr_err("%s: Error: Unknown bonding mode %d\n", 4195 dev->name, bond->params.mode); 4196 WARN_ON_ONCE(1); 4197 dev_kfree_skb(skb); 4198 return NETDEV_TX_OK; 4199 } 4200 } 4201 4202 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4203 { 4204 struct bonding *bond = netdev_priv(dev); 4205 netdev_tx_t ret = NETDEV_TX_OK; 4206 4207 /* 4208 * If we risk deadlock from transmitting this in the 4209 * netpoll path, tell netpoll to queue the frame for later tx 4210 */ 4211 if (is_netpoll_tx_blocked(dev)) 4212 return NETDEV_TX_BUSY; 4213 4214 read_lock(&bond->lock); 4215 4216 if (bond->slave_cnt) 4217 ret = __bond_start_xmit(skb, dev); 4218 else 4219 dev_kfree_skb(skb); 4220 4221 read_unlock(&bond->lock); 4222 4223 return ret; 4224 } 4225 4226 /* 4227 * set bond mode specific net device operations 4228 */ 4229 void bond_set_mode_ops(struct bonding *bond, int mode) 4230 { 4231 struct net_device *bond_dev = bond->dev; 4232 4233 switch (mode) { 4234 case BOND_MODE_ROUNDROBIN: 4235 break; 4236 case BOND_MODE_ACTIVEBACKUP: 4237 break; 4238 case BOND_MODE_XOR: 4239 bond_set_xmit_hash_policy(bond); 4240 break; 4241 case BOND_MODE_BROADCAST: 4242 break; 4243 case BOND_MODE_8023AD: 4244 bond_set_xmit_hash_policy(bond); 4245 break; 4246 case BOND_MODE_ALB: 4247 /* FALLTHRU */ 4248 case BOND_MODE_TLB: 4249 break; 4250 default: 4251 /* Should never happen, mode already checked */ 4252 pr_err("%s: Error: Unknown bonding mode %d\n", 4253 bond_dev->name, mode); 4254 break; 4255 } 4256 } 4257 4258 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 4259 struct ethtool_drvinfo *drvinfo) 4260 { 4261 strncpy(drvinfo->driver, DRV_NAME, 32); 4262 strncpy(drvinfo->version, DRV_VERSION, 32); 4263 snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION); 4264 } 4265 4266 static const struct ethtool_ops bond_ethtool_ops = { 4267 .get_drvinfo = bond_ethtool_get_drvinfo, 4268 .get_link = ethtool_op_get_link, 4269 }; 4270 4271 static const struct net_device_ops bond_netdev_ops = { 4272 .ndo_init = bond_init, 4273 .ndo_uninit = bond_uninit, 4274 .ndo_open = bond_open, 4275 .ndo_stop = bond_close, 4276 .ndo_start_xmit = bond_start_xmit, 4277 .ndo_select_queue = bond_select_queue, 4278 .ndo_get_stats64 = bond_get_stats, 4279 .ndo_do_ioctl = bond_do_ioctl, 4280 .ndo_change_rx_flags = bond_change_rx_flags, 4281 .ndo_set_rx_mode = bond_set_multicast_list, 4282 .ndo_change_mtu = bond_change_mtu, 4283 .ndo_set_mac_address = bond_set_mac_address, 4284 .ndo_neigh_setup = bond_neigh_setup, 4285 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 4286 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 4287 #ifdef CONFIG_NET_POLL_CONTROLLER 4288 .ndo_netpoll_setup = bond_netpoll_setup, 4289 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 4290 .ndo_poll_controller = bond_poll_controller, 4291 #endif 4292 .ndo_add_slave = bond_enslave, 4293 .ndo_del_slave = bond_release, 4294 .ndo_fix_features = bond_fix_features, 4295 }; 4296 4297 static void bond_destructor(struct net_device *bond_dev) 4298 { 4299 struct bonding *bond = netdev_priv(bond_dev); 4300 if (bond->wq) 4301 destroy_workqueue(bond->wq); 4302 free_netdev(bond_dev); 4303 } 4304 4305 static void bond_setup(struct net_device *bond_dev) 4306 { 4307 struct bonding *bond = netdev_priv(bond_dev); 4308 4309 /* initialize rwlocks */ 4310 rwlock_init(&bond->lock); 4311 rwlock_init(&bond->curr_slave_lock); 4312 4313 bond->params = bonding_defaults; 4314 4315 /* Initialize pointers */ 4316 bond->dev = bond_dev; 4317 INIT_LIST_HEAD(&bond->vlan_list); 4318 4319 /* Initialize the device entry points */ 4320 ether_setup(bond_dev); 4321 bond_dev->netdev_ops = &bond_netdev_ops; 4322 bond_dev->ethtool_ops = &bond_ethtool_ops; 4323 bond_set_mode_ops(bond, bond->params.mode); 4324 4325 bond_dev->destructor = bond_destructor; 4326 4327 /* Initialize the device options */ 4328 bond_dev->tx_queue_len = 0; 4329 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST; 4330 bond_dev->priv_flags |= IFF_BONDING; 4331 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 4332 4333 /* At first, we block adding VLANs. That's the only way to 4334 * prevent problems that occur when adding VLANs over an 4335 * empty bond. The block will be removed once non-challenged 4336 * slaves are enslaved. 4337 */ 4338 bond_dev->features |= NETIF_F_VLAN_CHALLENGED; 4339 4340 /* don't acquire bond device's netif_tx_lock when 4341 * transmitting */ 4342 bond_dev->features |= NETIF_F_LLTX; 4343 4344 /* By default, we declare the bond to be fully 4345 * VLAN hardware accelerated capable. Special 4346 * care is taken in the various xmit functions 4347 * when there are slaves that are not hw accel 4348 * capable 4349 */ 4350 4351 bond_dev->hw_features = BOND_VLAN_FEATURES | 4352 NETIF_F_HW_VLAN_TX | 4353 NETIF_F_HW_VLAN_RX | 4354 NETIF_F_HW_VLAN_FILTER; 4355 4356 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM); 4357 bond_dev->features |= bond_dev->hw_features; 4358 } 4359 4360 static void bond_work_cancel_all(struct bonding *bond) 4361 { 4362 if (bond->params.miimon && delayed_work_pending(&bond->mii_work)) 4363 cancel_delayed_work_sync(&bond->mii_work); 4364 4365 if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work)) 4366 cancel_delayed_work_sync(&bond->arp_work); 4367 4368 if (bond->params.mode == BOND_MODE_ALB && 4369 delayed_work_pending(&bond->alb_work)) 4370 cancel_delayed_work_sync(&bond->alb_work); 4371 4372 if (bond->params.mode == BOND_MODE_8023AD && 4373 delayed_work_pending(&bond->ad_work)) 4374 cancel_delayed_work_sync(&bond->ad_work); 4375 4376 if (delayed_work_pending(&bond->mcast_work)) 4377 cancel_delayed_work_sync(&bond->mcast_work); 4378 } 4379 4380 /* 4381 * Destroy a bonding device. 4382 * Must be under rtnl_lock when this function is called. 4383 */ 4384 static void bond_uninit(struct net_device *bond_dev) 4385 { 4386 struct bonding *bond = netdev_priv(bond_dev); 4387 struct vlan_entry *vlan, *tmp; 4388 4389 bond_netpoll_cleanup(bond_dev); 4390 4391 /* Release the bonded slaves */ 4392 bond_release_all(bond_dev); 4393 4394 list_del(&bond->bond_list); 4395 4396 bond_work_cancel_all(bond); 4397 4398 bond_remove_proc_entry(bond); 4399 4400 bond_debug_unregister(bond); 4401 4402 __hw_addr_flush(&bond->mc_list); 4403 4404 list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) { 4405 list_del(&vlan->vlan_list); 4406 kfree(vlan); 4407 } 4408 } 4409 4410 /*------------------------- Module initialization ---------------------------*/ 4411 4412 /* 4413 * Convert string input module parms. Accept either the 4414 * number of the mode or its string name. A bit complicated because 4415 * some mode names are substrings of other names, and calls from sysfs 4416 * may have whitespace in the name (trailing newlines, for example). 4417 */ 4418 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl) 4419 { 4420 int modeint = -1, i, rv; 4421 char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, }; 4422 4423 for (p = (char *)buf; *p; p++) 4424 if (!(isdigit(*p) || isspace(*p))) 4425 break; 4426 4427 if (*p) 4428 rv = sscanf(buf, "%20s", modestr); 4429 else 4430 rv = sscanf(buf, "%d", &modeint); 4431 4432 if (!rv) 4433 return -1; 4434 4435 for (i = 0; tbl[i].modename; i++) { 4436 if (modeint == tbl[i].mode) 4437 return tbl[i].mode; 4438 if (strcmp(modestr, tbl[i].modename) == 0) 4439 return tbl[i].mode; 4440 } 4441 4442 return -1; 4443 } 4444 4445 static int bond_check_params(struct bond_params *params) 4446 { 4447 int arp_validate_value, fail_over_mac_value, primary_reselect_value; 4448 4449 /* 4450 * Convert string parameters. 4451 */ 4452 if (mode) { 4453 bond_mode = bond_parse_parm(mode, bond_mode_tbl); 4454 if (bond_mode == -1) { 4455 pr_err("Error: Invalid bonding mode \"%s\"\n", 4456 mode == NULL ? "NULL" : mode); 4457 return -EINVAL; 4458 } 4459 } 4460 4461 if (xmit_hash_policy) { 4462 if ((bond_mode != BOND_MODE_XOR) && 4463 (bond_mode != BOND_MODE_8023AD)) { 4464 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 4465 bond_mode_name(bond_mode)); 4466 } else { 4467 xmit_hashtype = bond_parse_parm(xmit_hash_policy, 4468 xmit_hashtype_tbl); 4469 if (xmit_hashtype == -1) { 4470 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 4471 xmit_hash_policy == NULL ? "NULL" : 4472 xmit_hash_policy); 4473 return -EINVAL; 4474 } 4475 } 4476 } 4477 4478 if (lacp_rate) { 4479 if (bond_mode != BOND_MODE_8023AD) { 4480 pr_info("lacp_rate param is irrelevant in mode %s\n", 4481 bond_mode_name(bond_mode)); 4482 } else { 4483 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl); 4484 if (lacp_fast == -1) { 4485 pr_err("Error: Invalid lacp rate \"%s\"\n", 4486 lacp_rate == NULL ? "NULL" : lacp_rate); 4487 return -EINVAL; 4488 } 4489 } 4490 } 4491 4492 if (ad_select) { 4493 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl); 4494 if (params->ad_select == -1) { 4495 pr_err("Error: Invalid ad_select \"%s\"\n", 4496 ad_select == NULL ? "NULL" : ad_select); 4497 return -EINVAL; 4498 } 4499 4500 if (bond_mode != BOND_MODE_8023AD) { 4501 pr_warning("ad_select param only affects 802.3ad mode\n"); 4502 } 4503 } else { 4504 params->ad_select = BOND_AD_STABLE; 4505 } 4506 4507 if (max_bonds < 0) { 4508 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 4509 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 4510 max_bonds = BOND_DEFAULT_MAX_BONDS; 4511 } 4512 4513 if (miimon < 0) { 4514 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n", 4515 miimon, INT_MAX, BOND_LINK_MON_INTERV); 4516 miimon = BOND_LINK_MON_INTERV; 4517 } 4518 4519 if (updelay < 0) { 4520 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4521 updelay, INT_MAX); 4522 updelay = 0; 4523 } 4524 4525 if (downdelay < 0) { 4526 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4527 downdelay, INT_MAX); 4528 downdelay = 0; 4529 } 4530 4531 if ((use_carrier != 0) && (use_carrier != 1)) { 4532 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 4533 use_carrier); 4534 use_carrier = 1; 4535 } 4536 4537 if (num_peer_notif < 0 || num_peer_notif > 255) { 4538 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 4539 num_peer_notif); 4540 num_peer_notif = 1; 4541 } 4542 4543 /* reset values for 802.3ad */ 4544 if (bond_mode == BOND_MODE_8023AD) { 4545 if (!miimon) { 4546 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"); 4547 pr_warning("Forcing miimon to 100msec\n"); 4548 miimon = 100; 4549 } 4550 } 4551 4552 if (tx_queues < 1 || tx_queues > 255) { 4553 pr_warning("Warning: tx_queues (%d) should be between " 4554 "1 and 255, resetting to %d\n", 4555 tx_queues, BOND_DEFAULT_TX_QUEUES); 4556 tx_queues = BOND_DEFAULT_TX_QUEUES; 4557 } 4558 4559 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 4560 pr_warning("Warning: all_slaves_active module parameter (%d), " 4561 "not of valid value (0/1), so it was set to " 4562 "0\n", all_slaves_active); 4563 all_slaves_active = 0; 4564 } 4565 4566 if (resend_igmp < 0 || resend_igmp > 255) { 4567 pr_warning("Warning: resend_igmp (%d) should be between " 4568 "0 and 255, resetting to %d\n", 4569 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 4570 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 4571 } 4572 4573 /* reset values for TLB/ALB */ 4574 if ((bond_mode == BOND_MODE_TLB) || 4575 (bond_mode == BOND_MODE_ALB)) { 4576 if (!miimon) { 4577 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"); 4578 pr_warning("Forcing miimon to 100msec\n"); 4579 miimon = 100; 4580 } 4581 } 4582 4583 if (bond_mode == BOND_MODE_ALB) { 4584 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", 4585 updelay); 4586 } 4587 4588 if (!miimon) { 4589 if (updelay || downdelay) { 4590 /* just warn the user the up/down delay will have 4591 * no effect since miimon is zero... 4592 */ 4593 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", 4594 updelay, downdelay); 4595 } 4596 } else { 4597 /* don't allow arp monitoring */ 4598 if (arp_interval) { 4599 pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 4600 miimon, arp_interval); 4601 arp_interval = 0; 4602 } 4603 4604 if ((updelay % miimon) != 0) { 4605 pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 4606 updelay, miimon, 4607 (updelay / miimon) * miimon); 4608 } 4609 4610 updelay /= miimon; 4611 4612 if ((downdelay % miimon) != 0) { 4613 pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 4614 downdelay, miimon, 4615 (downdelay / miimon) * miimon); 4616 } 4617 4618 downdelay /= miimon; 4619 } 4620 4621 if (arp_interval < 0) { 4622 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n", 4623 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV); 4624 arp_interval = BOND_LINK_ARP_INTERV; 4625 } 4626 4627 for (arp_ip_count = 0; 4628 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count]; 4629 arp_ip_count++) { 4630 /* not complete check, but should be good enough to 4631 catch mistakes */ 4632 if (!isdigit(arp_ip_target[arp_ip_count][0])) { 4633 pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 4634 arp_ip_target[arp_ip_count]); 4635 arp_interval = 0; 4636 } else { 4637 __be32 ip = in_aton(arp_ip_target[arp_ip_count]); 4638 arp_target[arp_ip_count] = ip; 4639 } 4640 } 4641 4642 if (arp_interval && !arp_ip_count) { 4643 /* don't allow arping if no arp_ip_target given... */ 4644 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 4645 arp_interval); 4646 arp_interval = 0; 4647 } 4648 4649 if (arp_validate) { 4650 if (bond_mode != BOND_MODE_ACTIVEBACKUP) { 4651 pr_err("arp_validate only supported in active-backup mode\n"); 4652 return -EINVAL; 4653 } 4654 if (!arp_interval) { 4655 pr_err("arp_validate requires arp_interval\n"); 4656 return -EINVAL; 4657 } 4658 4659 arp_validate_value = bond_parse_parm(arp_validate, 4660 arp_validate_tbl); 4661 if (arp_validate_value == -1) { 4662 pr_err("Error: invalid arp_validate \"%s\"\n", 4663 arp_validate == NULL ? "NULL" : arp_validate); 4664 return -EINVAL; 4665 } 4666 } else 4667 arp_validate_value = 0; 4668 4669 if (miimon) { 4670 pr_info("MII link monitoring set to %d ms\n", miimon); 4671 } else if (arp_interval) { 4672 int i; 4673 4674 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 4675 arp_interval, 4676 arp_validate_tbl[arp_validate_value].modename, 4677 arp_ip_count); 4678 4679 for (i = 0; i < arp_ip_count; i++) 4680 pr_info(" %s", arp_ip_target[i]); 4681 4682 pr_info("\n"); 4683 4684 } else if (max_bonds) { 4685 /* miimon and arp_interval not set, we need one so things 4686 * work as expected, see bonding.txt for details 4687 */ 4688 pr_debug("Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details.\n"); 4689 } 4690 4691 if (primary && !USES_PRIMARY(bond_mode)) { 4692 /* currently, using a primary only makes sense 4693 * in active backup, TLB or ALB modes 4694 */ 4695 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n", 4696 primary, bond_mode_name(bond_mode)); 4697 primary = NULL; 4698 } 4699 4700 if (primary && primary_reselect) { 4701 primary_reselect_value = bond_parse_parm(primary_reselect, 4702 pri_reselect_tbl); 4703 if (primary_reselect_value == -1) { 4704 pr_err("Error: Invalid primary_reselect \"%s\"\n", 4705 primary_reselect == 4706 NULL ? "NULL" : primary_reselect); 4707 return -EINVAL; 4708 } 4709 } else { 4710 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 4711 } 4712 4713 if (fail_over_mac) { 4714 fail_over_mac_value = bond_parse_parm(fail_over_mac, 4715 fail_over_mac_tbl); 4716 if (fail_over_mac_value == -1) { 4717 pr_err("Error: invalid fail_over_mac \"%s\"\n", 4718 arp_validate == NULL ? "NULL" : arp_validate); 4719 return -EINVAL; 4720 } 4721 4722 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 4723 pr_warning("Warning: fail_over_mac only affects active-backup mode.\n"); 4724 } else { 4725 fail_over_mac_value = BOND_FOM_NONE; 4726 } 4727 4728 /* fill params struct with the proper values */ 4729 params->mode = bond_mode; 4730 params->xmit_policy = xmit_hashtype; 4731 params->miimon = miimon; 4732 params->num_peer_notif = num_peer_notif; 4733 params->arp_interval = arp_interval; 4734 params->arp_validate = arp_validate_value; 4735 params->updelay = updelay; 4736 params->downdelay = downdelay; 4737 params->use_carrier = use_carrier; 4738 params->lacp_fast = lacp_fast; 4739 params->primary[0] = 0; 4740 params->primary_reselect = primary_reselect_value; 4741 params->fail_over_mac = fail_over_mac_value; 4742 params->tx_queues = tx_queues; 4743 params->all_slaves_active = all_slaves_active; 4744 params->resend_igmp = resend_igmp; 4745 params->min_links = min_links; 4746 4747 if (primary) { 4748 strncpy(params->primary, primary, IFNAMSIZ); 4749 params->primary[IFNAMSIZ - 1] = 0; 4750 } 4751 4752 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 4753 4754 return 0; 4755 } 4756 4757 static struct lock_class_key bonding_netdev_xmit_lock_key; 4758 static struct lock_class_key bonding_netdev_addr_lock_key; 4759 4760 static void bond_set_lockdep_class_one(struct net_device *dev, 4761 struct netdev_queue *txq, 4762 void *_unused) 4763 { 4764 lockdep_set_class(&txq->_xmit_lock, 4765 &bonding_netdev_xmit_lock_key); 4766 } 4767 4768 static void bond_set_lockdep_class(struct net_device *dev) 4769 { 4770 lockdep_set_class(&dev->addr_list_lock, 4771 &bonding_netdev_addr_lock_key); 4772 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL); 4773 } 4774 4775 /* 4776 * Called from registration process 4777 */ 4778 static int bond_init(struct net_device *bond_dev) 4779 { 4780 struct bonding *bond = netdev_priv(bond_dev); 4781 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 4782 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); 4783 4784 pr_debug("Begin bond_init for %s\n", bond_dev->name); 4785 4786 /* 4787 * Initialize locks that may be required during 4788 * en/deslave operations. All of the bond_open work 4789 * (of which this is part) should really be moved to 4790 * a phase prior to dev_open 4791 */ 4792 spin_lock_init(&(bond_info->tx_hashtbl_lock)); 4793 spin_lock_init(&(bond_info->rx_hashtbl_lock)); 4794 4795 bond->wq = create_singlethread_workqueue(bond_dev->name); 4796 if (!bond->wq) 4797 return -ENOMEM; 4798 4799 bond_set_lockdep_class(bond_dev); 4800 4801 bond_create_proc_entry(bond); 4802 list_add_tail(&bond->bond_list, &bn->dev_list); 4803 4804 bond_prepare_sysfs_group(bond); 4805 4806 bond_debug_register(bond); 4807 4808 __hw_addr_init(&bond->mc_list); 4809 return 0; 4810 } 4811 4812 static int bond_validate(struct nlattr *tb[], struct nlattr *data[]) 4813 { 4814 if (tb[IFLA_ADDRESS]) { 4815 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 4816 return -EINVAL; 4817 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 4818 return -EADDRNOTAVAIL; 4819 } 4820 return 0; 4821 } 4822 4823 static int bond_get_tx_queues(struct net *net, struct nlattr *tb[], 4824 unsigned int *num_queues, 4825 unsigned int *real_num_queues) 4826 { 4827 *num_queues = tx_queues; 4828 return 0; 4829 } 4830 4831 static struct rtnl_link_ops bond_link_ops __read_mostly = { 4832 .kind = "bond", 4833 .priv_size = sizeof(struct bonding), 4834 .setup = bond_setup, 4835 .validate = bond_validate, 4836 .get_tx_queues = bond_get_tx_queues, 4837 }; 4838 4839 /* Create a new bond based on the specified name and bonding parameters. 4840 * If name is NULL, obtain a suitable "bond%d" name for us. 4841 * Caller must NOT hold rtnl_lock; we need to release it here before we 4842 * set up our sysfs entries. 4843 */ 4844 int bond_create(struct net *net, const char *name) 4845 { 4846 struct net_device *bond_dev; 4847 int res; 4848 4849 rtnl_lock(); 4850 4851 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 4852 name ? name : "bond%d", 4853 bond_setup, tx_queues); 4854 if (!bond_dev) { 4855 pr_err("%s: eek! can't alloc netdev!\n", name); 4856 rtnl_unlock(); 4857 return -ENOMEM; 4858 } 4859 4860 dev_net_set(bond_dev, net); 4861 bond_dev->rtnl_link_ops = &bond_link_ops; 4862 4863 res = register_netdevice(bond_dev); 4864 4865 netif_carrier_off(bond_dev); 4866 4867 rtnl_unlock(); 4868 if (res < 0) 4869 bond_destructor(bond_dev); 4870 return res; 4871 } 4872 4873 static int __net_init bond_net_init(struct net *net) 4874 { 4875 struct bond_net *bn = net_generic(net, bond_net_id); 4876 4877 bn->net = net; 4878 INIT_LIST_HEAD(&bn->dev_list); 4879 4880 bond_create_proc_dir(bn); 4881 bond_create_sysfs(bn); 4882 4883 return 0; 4884 } 4885 4886 static void __net_exit bond_net_exit(struct net *net) 4887 { 4888 struct bond_net *bn = net_generic(net, bond_net_id); 4889 4890 bond_destroy_sysfs(bn); 4891 bond_destroy_proc_dir(bn); 4892 } 4893 4894 static struct pernet_operations bond_net_ops = { 4895 .init = bond_net_init, 4896 .exit = bond_net_exit, 4897 .id = &bond_net_id, 4898 .size = sizeof(struct bond_net), 4899 }; 4900 4901 static int __init bonding_init(void) 4902 { 4903 int i; 4904 int res; 4905 4906 pr_info("%s", bond_version); 4907 4908 res = bond_check_params(&bonding_defaults); 4909 if (res) 4910 goto out; 4911 4912 res = register_pernet_subsys(&bond_net_ops); 4913 if (res) 4914 goto out; 4915 4916 res = rtnl_link_register(&bond_link_ops); 4917 if (res) 4918 goto err_link; 4919 4920 bond_create_debugfs(); 4921 4922 for (i = 0; i < max_bonds; i++) { 4923 res = bond_create(&init_net, NULL); 4924 if (res) 4925 goto err; 4926 } 4927 4928 register_netdevice_notifier(&bond_netdev_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 4943 bond_destroy_debugfs(); 4944 4945 rtnl_link_unregister(&bond_link_ops); 4946 unregister_pernet_subsys(&bond_net_ops); 4947 4948 #ifdef CONFIG_NET_POLL_CONTROLLER 4949 /* 4950 * Make sure we don't have an imbalance on our netpoll blocking 4951 */ 4952 WARN_ON(atomic_read(&netpoll_block_tx)); 4953 #endif 4954 } 4955 4956 module_init(bonding_init); 4957 module_exit(bonding_exit); 4958 MODULE_LICENSE("GPL"); 4959 MODULE_VERSION(DRV_VERSION); 4960 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION); 4961 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 4962 MODULE_ALIAS_RTNL_LINK("bond"); 4963