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