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