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 int (*recv_probe)(struct sk_buff *, struct bonding *, 1448 struct slave *); 1449 int ret = RX_HANDLER_ANOTHER; 1450 1451 skb = skb_share_check(skb, GFP_ATOMIC); 1452 if (unlikely(!skb)) 1453 return RX_HANDLER_CONSUMED; 1454 1455 *pskb = skb; 1456 1457 slave = bond_slave_get_rcu(skb->dev); 1458 bond = slave->bond; 1459 1460 if (bond->params.arp_interval) 1461 slave->dev->last_rx = jiffies; 1462 1463 recv_probe = ACCESS_ONCE(bond->recv_probe); 1464 if (recv_probe) { 1465 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); 1466 1467 if (likely(nskb)) { 1468 ret = recv_probe(nskb, bond, slave); 1469 dev_kfree_skb(nskb); 1470 if (ret == RX_HANDLER_CONSUMED) { 1471 consume_skb(skb); 1472 return ret; 1473 } 1474 } 1475 } 1476 1477 if (bond_should_deliver_exact_match(skb, slave, bond)) { 1478 return RX_HANDLER_EXACT; 1479 } 1480 1481 skb->dev = bond->dev; 1482 1483 if (bond->params.mode == BOND_MODE_ALB && 1484 bond->dev->priv_flags & IFF_BRIDGE_PORT && 1485 skb->pkt_type == PACKET_HOST) { 1486 1487 if (unlikely(skb_cow_head(skb, 1488 skb->data - skb_mac_header(skb)))) { 1489 kfree_skb(skb); 1490 return RX_HANDLER_CONSUMED; 1491 } 1492 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN); 1493 } 1494 1495 return ret; 1496 } 1497 1498 /* enslave device <slave> to bond device <master> */ 1499 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev) 1500 { 1501 struct bonding *bond = netdev_priv(bond_dev); 1502 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1503 struct slave *new_slave = NULL; 1504 struct netdev_hw_addr *ha; 1505 struct sockaddr addr; 1506 int link_reporting; 1507 int res = 0; 1508 1509 if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL && 1510 slave_ops->ndo_do_ioctl == NULL) { 1511 pr_warning("%s: Warning: no link monitoring support for %s\n", 1512 bond_dev->name, slave_dev->name); 1513 } 1514 1515 /* already enslaved */ 1516 if (slave_dev->flags & IFF_SLAVE) { 1517 pr_debug("Error, Device was already enslaved\n"); 1518 return -EBUSY; 1519 } 1520 1521 /* vlan challenged mutual exclusion */ 1522 /* no need to lock since we're protected by rtnl_lock */ 1523 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1524 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name); 1525 if (bond_vlan_used(bond)) { 1526 pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n", 1527 bond_dev->name, slave_dev->name, bond_dev->name); 1528 return -EPERM; 1529 } else { 1530 pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n", 1531 bond_dev->name, slave_dev->name, 1532 slave_dev->name, bond_dev->name); 1533 } 1534 } else { 1535 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name); 1536 } 1537 1538 /* 1539 * Old ifenslave binaries are no longer supported. These can 1540 * be identified with moderate accuracy by the state of the slave: 1541 * the current ifenslave will set the interface down prior to 1542 * enslaving it; the old ifenslave will not. 1543 */ 1544 if ((slave_dev->flags & IFF_UP)) { 1545 pr_err("%s is up. This may be due to an out of date ifenslave.\n", 1546 slave_dev->name); 1547 res = -EPERM; 1548 goto err_undo_flags; 1549 } 1550 1551 /* set bonding device ether type by slave - bonding netdevices are 1552 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1553 * there is a need to override some of the type dependent attribs/funcs. 1554 * 1555 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1556 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1557 */ 1558 if (bond->slave_cnt == 0) { 1559 if (bond_dev->type != slave_dev->type) { 1560 pr_debug("%s: change device type from %d to %d\n", 1561 bond_dev->name, 1562 bond_dev->type, slave_dev->type); 1563 1564 res = netdev_bonding_change(bond_dev, 1565 NETDEV_PRE_TYPE_CHANGE); 1566 res = notifier_to_errno(res); 1567 if (res) { 1568 pr_err("%s: refused to change device type\n", 1569 bond_dev->name); 1570 res = -EBUSY; 1571 goto err_undo_flags; 1572 } 1573 1574 /* Flush unicast and multicast addresses */ 1575 dev_uc_flush(bond_dev); 1576 dev_mc_flush(bond_dev); 1577 1578 if (slave_dev->type != ARPHRD_ETHER) 1579 bond_setup_by_slave(bond_dev, slave_dev); 1580 else { 1581 ether_setup(bond_dev); 1582 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1583 } 1584 1585 netdev_bonding_change(bond_dev, 1586 NETDEV_POST_TYPE_CHANGE); 1587 } 1588 } else if (bond_dev->type != slave_dev->type) { 1589 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n", 1590 slave_dev->name, 1591 slave_dev->type, bond_dev->type); 1592 res = -EINVAL; 1593 goto err_undo_flags; 1594 } 1595 1596 if (slave_ops->ndo_set_mac_address == NULL) { 1597 if (bond->slave_cnt == 0) { 1598 pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.", 1599 bond_dev->name); 1600 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1601 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1602 pr_err("%s: Error: The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active.\n", 1603 bond_dev->name); 1604 res = -EOPNOTSUPP; 1605 goto err_undo_flags; 1606 } 1607 } 1608 1609 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1610 1611 /* If this is the first slave, then we need to set the master's hardware 1612 * address to be the same as the slave's. */ 1613 if (is_zero_ether_addr(bond->dev->dev_addr)) 1614 memcpy(bond->dev->dev_addr, slave_dev->dev_addr, 1615 slave_dev->addr_len); 1616 1617 1618 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL); 1619 if (!new_slave) { 1620 res = -ENOMEM; 1621 goto err_undo_flags; 1622 } 1623 1624 /* 1625 * Set the new_slave's queue_id to be zero. Queue ID mapping 1626 * is set via sysfs or module option if desired. 1627 */ 1628 new_slave->queue_id = 0; 1629 1630 /* Save slave's original mtu and then set it to match the bond */ 1631 new_slave->original_mtu = slave_dev->mtu; 1632 res = dev_set_mtu(slave_dev, bond->dev->mtu); 1633 if (res) { 1634 pr_debug("Error %d calling dev_set_mtu\n", res); 1635 goto err_free; 1636 } 1637 1638 /* 1639 * Save slave's original ("permanent") mac address for modes 1640 * that need it, and for restoring it upon release, and then 1641 * set it to the master's address 1642 */ 1643 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN); 1644 1645 if (!bond->params.fail_over_mac) { 1646 /* 1647 * Set slave to master's mac address. The application already 1648 * set the master's mac address to that of the first slave 1649 */ 1650 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 1651 addr.sa_family = slave_dev->type; 1652 res = dev_set_mac_address(slave_dev, &addr); 1653 if (res) { 1654 pr_debug("Error %d calling set_mac_address\n", res); 1655 goto err_restore_mtu; 1656 } 1657 } 1658 1659 res = netdev_set_bond_master(slave_dev, bond_dev); 1660 if (res) { 1661 pr_debug("Error %d calling netdev_set_bond_master\n", res); 1662 goto err_restore_mac; 1663 } 1664 1665 /* open the slave since the application closed it */ 1666 res = dev_open(slave_dev); 1667 if (res) { 1668 pr_debug("Opening slave %s failed\n", slave_dev->name); 1669 goto err_unset_master; 1670 } 1671 1672 new_slave->bond = bond; 1673 new_slave->dev = slave_dev; 1674 slave_dev->priv_flags |= IFF_BONDING; 1675 1676 if (bond_is_lb(bond)) { 1677 /* bond_alb_init_slave() must be called before all other stages since 1678 * it might fail and we do not want to have to undo everything 1679 */ 1680 res = bond_alb_init_slave(bond, new_slave); 1681 if (res) 1682 goto err_close; 1683 } 1684 1685 /* If the mode USES_PRIMARY, then the new slave gets the 1686 * master's promisc (and mc) settings only if it becomes the 1687 * curr_active_slave, and that is taken care of later when calling 1688 * bond_change_active() 1689 */ 1690 if (!USES_PRIMARY(bond->params.mode)) { 1691 /* set promiscuity level to new slave */ 1692 if (bond_dev->flags & IFF_PROMISC) { 1693 res = dev_set_promiscuity(slave_dev, 1); 1694 if (res) 1695 goto err_close; 1696 } 1697 1698 /* set allmulti level to new slave */ 1699 if (bond_dev->flags & IFF_ALLMULTI) { 1700 res = dev_set_allmulti(slave_dev, 1); 1701 if (res) 1702 goto err_close; 1703 } 1704 1705 netif_addr_lock_bh(bond_dev); 1706 /* upload master's mc_list to new slave */ 1707 netdev_for_each_mc_addr(ha, bond_dev) 1708 dev_mc_add(slave_dev, ha->addr); 1709 netif_addr_unlock_bh(bond_dev); 1710 } 1711 1712 if (bond->params.mode == BOND_MODE_8023AD) { 1713 /* add lacpdu mc addr to mc list */ 1714 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 1715 1716 dev_mc_add(slave_dev, lacpdu_multicast); 1717 } 1718 1719 bond_add_vlans_on_slave(bond, slave_dev); 1720 1721 write_lock_bh(&bond->lock); 1722 1723 bond_attach_slave(bond, new_slave); 1724 1725 new_slave->delay = 0; 1726 new_slave->link_failure_count = 0; 1727 1728 write_unlock_bh(&bond->lock); 1729 1730 bond_compute_features(bond); 1731 1732 read_lock(&bond->lock); 1733 1734 new_slave->last_arp_rx = jiffies - 1735 (msecs_to_jiffies(bond->params.arp_interval) + 1); 1736 1737 if (bond->params.miimon && !bond->params.use_carrier) { 1738 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 1739 1740 if ((link_reporting == -1) && !bond->params.arp_interval) { 1741 /* 1742 * miimon is set but a bonded network driver 1743 * does not support ETHTOOL/MII and 1744 * arp_interval is not set. Note: if 1745 * use_carrier is enabled, we will never go 1746 * here (because netif_carrier is always 1747 * supported); thus, we don't need to change 1748 * the messages for netif_carrier. 1749 */ 1750 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", 1751 bond_dev->name, slave_dev->name); 1752 } else if (link_reporting == -1) { 1753 /* unable get link status using mii/ethtool */ 1754 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", 1755 bond_dev->name, slave_dev->name); 1756 } 1757 } 1758 1759 /* check for initial state */ 1760 if (bond->params.miimon) { 1761 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { 1762 if (bond->params.updelay) { 1763 new_slave->link = BOND_LINK_BACK; 1764 new_slave->delay = bond->params.updelay; 1765 } else { 1766 new_slave->link = BOND_LINK_UP; 1767 } 1768 } else { 1769 new_slave->link = BOND_LINK_DOWN; 1770 } 1771 } else if (bond->params.arp_interval) { 1772 new_slave->link = (netif_carrier_ok(slave_dev) ? 1773 BOND_LINK_UP : BOND_LINK_DOWN); 1774 } else { 1775 new_slave->link = BOND_LINK_UP; 1776 } 1777 1778 if (new_slave->link != BOND_LINK_DOWN) 1779 new_slave->jiffies = jiffies; 1780 pr_debug("Initial state of slave_dev is BOND_LINK_%s\n", 1781 new_slave->link == BOND_LINK_DOWN ? "DOWN" : 1782 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); 1783 1784 bond_update_speed_duplex(new_slave); 1785 1786 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) { 1787 /* if there is a primary slave, remember it */ 1788 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 1789 bond->primary_slave = new_slave; 1790 bond->force_primary = true; 1791 } 1792 } 1793 1794 write_lock_bh(&bond->curr_slave_lock); 1795 1796 switch (bond->params.mode) { 1797 case BOND_MODE_ACTIVEBACKUP: 1798 bond_set_slave_inactive_flags(new_slave); 1799 bond_select_active_slave(bond); 1800 break; 1801 case BOND_MODE_8023AD: 1802 /* in 802.3ad mode, the internal mechanism 1803 * will activate the slaves in the selected 1804 * aggregator 1805 */ 1806 bond_set_slave_inactive_flags(new_slave); 1807 /* if this is the first slave */ 1808 if (bond->slave_cnt == 1) { 1809 SLAVE_AD_INFO(new_slave).id = 1; 1810 /* Initialize AD with the number of times that the AD timer is called in 1 second 1811 * can be called only after the mac address of the bond is set 1812 */ 1813 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL); 1814 } else { 1815 SLAVE_AD_INFO(new_slave).id = 1816 SLAVE_AD_INFO(new_slave->prev).id + 1; 1817 } 1818 1819 bond_3ad_bind_slave(new_slave); 1820 break; 1821 case BOND_MODE_TLB: 1822 case BOND_MODE_ALB: 1823 bond_set_active_slave(new_slave); 1824 bond_set_slave_inactive_flags(new_slave); 1825 bond_select_active_slave(bond); 1826 break; 1827 default: 1828 pr_debug("This slave is always active in trunk mode\n"); 1829 1830 /* always active in trunk mode */ 1831 bond_set_active_slave(new_slave); 1832 1833 /* In trunking mode there is little meaning to curr_active_slave 1834 * anyway (it holds no special properties of the bond device), 1835 * so we can change it without calling change_active_interface() 1836 */ 1837 if (!bond->curr_active_slave) 1838 bond->curr_active_slave = new_slave; 1839 1840 break; 1841 } /* switch(bond_mode) */ 1842 1843 write_unlock_bh(&bond->curr_slave_lock); 1844 1845 bond_set_carrier(bond); 1846 1847 #ifdef CONFIG_NET_POLL_CONTROLLER 1848 slave_dev->npinfo = bond_netpoll_info(bond); 1849 if (slave_dev->npinfo) { 1850 if (slave_enable_netpoll(new_slave)) { 1851 read_unlock(&bond->lock); 1852 pr_info("Error, %s: master_dev is using netpoll, " 1853 "but new slave device does not support netpoll.\n", 1854 bond_dev->name); 1855 res = -EBUSY; 1856 goto err_detach; 1857 } 1858 } 1859 #endif 1860 1861 read_unlock(&bond->lock); 1862 1863 res = bond_create_slave_symlinks(bond_dev, slave_dev); 1864 if (res) 1865 goto err_detach; 1866 1867 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 1868 new_slave); 1869 if (res) { 1870 pr_debug("Error %d calling netdev_rx_handler_register\n", res); 1871 goto err_dest_symlinks; 1872 } 1873 1874 pr_info("%s: enslaving %s as a%s interface with a%s link.\n", 1875 bond_dev->name, slave_dev->name, 1876 bond_is_active_slave(new_slave) ? "n active" : " backup", 1877 new_slave->link != BOND_LINK_DOWN ? "n up" : " down"); 1878 1879 /* enslave is successful */ 1880 return 0; 1881 1882 /* Undo stages on error */ 1883 err_dest_symlinks: 1884 bond_destroy_slave_symlinks(bond_dev, slave_dev); 1885 1886 err_detach: 1887 write_lock_bh(&bond->lock); 1888 bond_detach_slave(bond, new_slave); 1889 write_unlock_bh(&bond->lock); 1890 1891 err_close: 1892 dev_close(slave_dev); 1893 1894 err_unset_master: 1895 netdev_set_bond_master(slave_dev, NULL); 1896 1897 err_restore_mac: 1898 if (!bond->params.fail_over_mac) { 1899 /* XXX TODO - fom follow mode needs to change master's 1900 * MAC if this slave's MAC is in use by the bond, or at 1901 * least print a warning. 1902 */ 1903 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN); 1904 addr.sa_family = slave_dev->type; 1905 dev_set_mac_address(slave_dev, &addr); 1906 } 1907 1908 err_restore_mtu: 1909 dev_set_mtu(slave_dev, new_slave->original_mtu); 1910 1911 err_free: 1912 kfree(new_slave); 1913 1914 err_undo_flags: 1915 bond_compute_features(bond); 1916 1917 return res; 1918 } 1919 1920 /* 1921 * Try to release the slave device <slave> from the bond device <master> 1922 * It is legal to access curr_active_slave without a lock because all the function 1923 * is write-locked. 1924 * 1925 * The rules for slave state should be: 1926 * for Active/Backup: 1927 * Active stays on all backups go down 1928 * for Bonded connections: 1929 * The first up interface should be left on and all others downed. 1930 */ 1931 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 1932 { 1933 struct bonding *bond = netdev_priv(bond_dev); 1934 struct slave *slave, *oldcurrent; 1935 struct sockaddr addr; 1936 netdev_features_t old_features = bond_dev->features; 1937 1938 /* slave is not a slave or master is not master of this slave */ 1939 if (!(slave_dev->flags & IFF_SLAVE) || 1940 (slave_dev->master != bond_dev)) { 1941 pr_err("%s: Error: cannot release %s.\n", 1942 bond_dev->name, slave_dev->name); 1943 return -EINVAL; 1944 } 1945 1946 block_netpoll_tx(); 1947 netdev_bonding_change(bond_dev, NETDEV_RELEASE); 1948 write_lock_bh(&bond->lock); 1949 1950 slave = bond_get_slave_by_dev(bond, slave_dev); 1951 if (!slave) { 1952 /* not a slave of this bond */ 1953 pr_info("%s: %s not enslaved\n", 1954 bond_dev->name, slave_dev->name); 1955 write_unlock_bh(&bond->lock); 1956 unblock_netpoll_tx(); 1957 return -EINVAL; 1958 } 1959 1960 /* unregister rx_handler early so bond_handle_frame wouldn't be called 1961 * for this slave anymore. 1962 */ 1963 netdev_rx_handler_unregister(slave_dev); 1964 write_unlock_bh(&bond->lock); 1965 synchronize_net(); 1966 write_lock_bh(&bond->lock); 1967 1968 if (!bond->params.fail_over_mac) { 1969 if (ether_addr_equal(bond_dev->dev_addr, slave->perm_hwaddr) && 1970 bond->slave_cnt > 1) 1971 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", 1972 bond_dev->name, slave_dev->name, 1973 slave->perm_hwaddr, 1974 bond_dev->name, slave_dev->name); 1975 } 1976 1977 /* Inform AD package of unbinding of slave. */ 1978 if (bond->params.mode == BOND_MODE_8023AD) { 1979 /* must be called before the slave is 1980 * detached from the list 1981 */ 1982 bond_3ad_unbind_slave(slave); 1983 } 1984 1985 pr_info("%s: releasing %s interface %s\n", 1986 bond_dev->name, 1987 bond_is_active_slave(slave) ? "active" : "backup", 1988 slave_dev->name); 1989 1990 oldcurrent = bond->curr_active_slave; 1991 1992 bond->current_arp_slave = NULL; 1993 1994 /* release the slave from its bond */ 1995 bond_detach_slave(bond, slave); 1996 1997 if (bond->primary_slave == slave) 1998 bond->primary_slave = NULL; 1999 2000 if (oldcurrent == slave) 2001 bond_change_active_slave(bond, NULL); 2002 2003 if (bond_is_lb(bond)) { 2004 /* Must be called only after the slave has been 2005 * detached from the list and the curr_active_slave 2006 * has been cleared (if our_slave == old_current), 2007 * but before a new active slave is selected. 2008 */ 2009 write_unlock_bh(&bond->lock); 2010 bond_alb_deinit_slave(bond, slave); 2011 write_lock_bh(&bond->lock); 2012 } 2013 2014 if (oldcurrent == slave) { 2015 /* 2016 * Note that we hold RTNL over this sequence, so there 2017 * is no concern that another slave add/remove event 2018 * will interfere. 2019 */ 2020 write_unlock_bh(&bond->lock); 2021 read_lock(&bond->lock); 2022 write_lock_bh(&bond->curr_slave_lock); 2023 2024 bond_select_active_slave(bond); 2025 2026 write_unlock_bh(&bond->curr_slave_lock); 2027 read_unlock(&bond->lock); 2028 write_lock_bh(&bond->lock); 2029 } 2030 2031 if (bond->slave_cnt == 0) { 2032 bond_set_carrier(bond); 2033 2034 /* if the last slave was removed, zero the mac address 2035 * of the master so it will be set by the application 2036 * to the mac address of the first slave 2037 */ 2038 memset(bond_dev->dev_addr, 0, bond_dev->addr_len); 2039 2040 if (bond_vlan_used(bond)) { 2041 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n", 2042 bond_dev->name, bond_dev->name); 2043 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n", 2044 bond_dev->name); 2045 } 2046 } 2047 2048 write_unlock_bh(&bond->lock); 2049 unblock_netpoll_tx(); 2050 2051 if (bond->slave_cnt == 0) 2052 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 2053 2054 bond_compute_features(bond); 2055 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 2056 (old_features & NETIF_F_VLAN_CHALLENGED)) 2057 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n", 2058 bond_dev->name, slave_dev->name, bond_dev->name); 2059 2060 /* must do this from outside any spinlocks */ 2061 bond_destroy_slave_symlinks(bond_dev, slave_dev); 2062 2063 bond_del_vlans_from_slave(bond, slave_dev); 2064 2065 /* If the mode USES_PRIMARY, then we should only remove its 2066 * promisc and mc settings if it was the curr_active_slave, but that was 2067 * already taken care of above when we detached the slave 2068 */ 2069 if (!USES_PRIMARY(bond->params.mode)) { 2070 /* unset promiscuity level from slave */ 2071 if (bond_dev->flags & IFF_PROMISC) 2072 dev_set_promiscuity(slave_dev, -1); 2073 2074 /* unset allmulti level from slave */ 2075 if (bond_dev->flags & IFF_ALLMULTI) 2076 dev_set_allmulti(slave_dev, -1); 2077 2078 /* flush master's mc_list from slave */ 2079 netif_addr_lock_bh(bond_dev); 2080 bond_mc_list_flush(bond_dev, slave_dev); 2081 netif_addr_unlock_bh(bond_dev); 2082 } 2083 2084 netdev_set_bond_master(slave_dev, NULL); 2085 2086 slave_disable_netpoll(slave); 2087 2088 /* close slave before restoring its mac address */ 2089 dev_close(slave_dev); 2090 2091 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 2092 /* restore original ("permanent") mac address */ 2093 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN); 2094 addr.sa_family = slave_dev->type; 2095 dev_set_mac_address(slave_dev, &addr); 2096 } 2097 2098 dev_set_mtu(slave_dev, slave->original_mtu); 2099 2100 slave_dev->priv_flags &= ~IFF_BONDING; 2101 2102 kfree(slave); 2103 2104 return 0; /* deletion OK */ 2105 } 2106 2107 /* 2108 * First release a slave and then destroy the bond if no more slaves are left. 2109 * Must be under rtnl_lock when this function is called. 2110 */ 2111 static int bond_release_and_destroy(struct net_device *bond_dev, 2112 struct net_device *slave_dev) 2113 { 2114 struct bonding *bond = netdev_priv(bond_dev); 2115 int ret; 2116 2117 ret = bond_release(bond_dev, slave_dev); 2118 if ((ret == 0) && (bond->slave_cnt == 0)) { 2119 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 2120 pr_info("%s: destroying bond %s.\n", 2121 bond_dev->name, bond_dev->name); 2122 unregister_netdevice(bond_dev); 2123 } 2124 return ret; 2125 } 2126 2127 /* 2128 * This function releases all slaves. 2129 */ 2130 static int bond_release_all(struct net_device *bond_dev) 2131 { 2132 struct bonding *bond = netdev_priv(bond_dev); 2133 struct slave *slave; 2134 struct net_device *slave_dev; 2135 struct sockaddr addr; 2136 2137 write_lock_bh(&bond->lock); 2138 2139 netif_carrier_off(bond_dev); 2140 2141 if (bond->slave_cnt == 0) 2142 goto out; 2143 2144 bond->current_arp_slave = NULL; 2145 bond->primary_slave = NULL; 2146 bond_change_active_slave(bond, NULL); 2147 2148 while ((slave = bond->first_slave) != NULL) { 2149 /* Inform AD package of unbinding of slave 2150 * before slave is detached from the list. 2151 */ 2152 if (bond->params.mode == BOND_MODE_8023AD) 2153 bond_3ad_unbind_slave(slave); 2154 2155 slave_dev = slave->dev; 2156 bond_detach_slave(bond, slave); 2157 2158 /* now that the slave is detached, unlock and perform 2159 * all the undo steps that should not be called from 2160 * within a lock. 2161 */ 2162 write_unlock_bh(&bond->lock); 2163 2164 /* unregister rx_handler early so bond_handle_frame wouldn't 2165 * be called for this slave anymore. 2166 */ 2167 netdev_rx_handler_unregister(slave_dev); 2168 synchronize_net(); 2169 2170 if (bond_is_lb(bond)) { 2171 /* must be called only after the slave 2172 * has been detached from the list 2173 */ 2174 bond_alb_deinit_slave(bond, slave); 2175 } 2176 2177 bond_destroy_slave_symlinks(bond_dev, slave_dev); 2178 bond_del_vlans_from_slave(bond, slave_dev); 2179 2180 /* If the mode USES_PRIMARY, then we should only remove its 2181 * promisc and mc settings if it was the curr_active_slave, but that was 2182 * already taken care of above when we detached the slave 2183 */ 2184 if (!USES_PRIMARY(bond->params.mode)) { 2185 /* unset promiscuity level from slave */ 2186 if (bond_dev->flags & IFF_PROMISC) 2187 dev_set_promiscuity(slave_dev, -1); 2188 2189 /* unset allmulti level from slave */ 2190 if (bond_dev->flags & IFF_ALLMULTI) 2191 dev_set_allmulti(slave_dev, -1); 2192 2193 /* flush master's mc_list from slave */ 2194 netif_addr_lock_bh(bond_dev); 2195 bond_mc_list_flush(bond_dev, slave_dev); 2196 netif_addr_unlock_bh(bond_dev); 2197 } 2198 2199 netdev_set_bond_master(slave_dev, NULL); 2200 2201 slave_disable_netpoll(slave); 2202 2203 /* close slave before restoring its mac address */ 2204 dev_close(slave_dev); 2205 2206 if (!bond->params.fail_over_mac) { 2207 /* restore original ("permanent") mac address*/ 2208 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN); 2209 addr.sa_family = slave_dev->type; 2210 dev_set_mac_address(slave_dev, &addr); 2211 } 2212 2213 kfree(slave); 2214 2215 /* re-acquire the lock before getting the next slave */ 2216 write_lock_bh(&bond->lock); 2217 } 2218 2219 /* zero the mac address of the master so it will be 2220 * set by the application to the mac address of the 2221 * first slave 2222 */ 2223 memset(bond_dev->dev_addr, 0, bond_dev->addr_len); 2224 2225 if (bond_vlan_used(bond)) { 2226 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n", 2227 bond_dev->name, bond_dev->name); 2228 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n", 2229 bond_dev->name); 2230 } 2231 2232 pr_info("%s: released all slaves\n", bond_dev->name); 2233 2234 out: 2235 write_unlock_bh(&bond->lock); 2236 2237 bond_compute_features(bond); 2238 2239 return 0; 2240 } 2241 2242 /* 2243 * This function changes the active slave to slave <slave_dev>. 2244 * It returns -EINVAL in the following cases. 2245 * - <slave_dev> is not found in the list. 2246 * - There is not active slave now. 2247 * - <slave_dev> is already active. 2248 * - The link state of <slave_dev> is not BOND_LINK_UP. 2249 * - <slave_dev> is not running. 2250 * In these cases, this function does nothing. 2251 * In the other cases, current_slave pointer is changed and 0 is returned. 2252 */ 2253 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev) 2254 { 2255 struct bonding *bond = netdev_priv(bond_dev); 2256 struct slave *old_active = NULL; 2257 struct slave *new_active = NULL; 2258 int res = 0; 2259 2260 if (!USES_PRIMARY(bond->params.mode)) 2261 return -EINVAL; 2262 2263 /* Verify that master_dev is indeed the master of slave_dev */ 2264 if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev)) 2265 return -EINVAL; 2266 2267 read_lock(&bond->lock); 2268 2269 read_lock(&bond->curr_slave_lock); 2270 old_active = bond->curr_active_slave; 2271 read_unlock(&bond->curr_slave_lock); 2272 2273 new_active = bond_get_slave_by_dev(bond, slave_dev); 2274 2275 /* 2276 * Changing to the current active: do nothing; return success. 2277 */ 2278 if (new_active && (new_active == old_active)) { 2279 read_unlock(&bond->lock); 2280 return 0; 2281 } 2282 2283 if ((new_active) && 2284 (old_active) && 2285 (new_active->link == BOND_LINK_UP) && 2286 IS_UP(new_active->dev)) { 2287 block_netpoll_tx(); 2288 write_lock_bh(&bond->curr_slave_lock); 2289 bond_change_active_slave(bond, new_active); 2290 write_unlock_bh(&bond->curr_slave_lock); 2291 unblock_netpoll_tx(); 2292 } else 2293 res = -EINVAL; 2294 2295 read_unlock(&bond->lock); 2296 2297 return res; 2298 } 2299 2300 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info) 2301 { 2302 struct bonding *bond = netdev_priv(bond_dev); 2303 2304 info->bond_mode = bond->params.mode; 2305 info->miimon = bond->params.miimon; 2306 2307 read_lock(&bond->lock); 2308 info->num_slaves = bond->slave_cnt; 2309 read_unlock(&bond->lock); 2310 2311 return 0; 2312 } 2313 2314 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 2315 { 2316 struct bonding *bond = netdev_priv(bond_dev); 2317 struct slave *slave; 2318 int i, res = -ENODEV; 2319 2320 read_lock(&bond->lock); 2321 2322 bond_for_each_slave(bond, slave, i) { 2323 if (i == (int)info->slave_id) { 2324 res = 0; 2325 strcpy(info->slave_name, slave->dev->name); 2326 info->link = slave->link; 2327 info->state = bond_slave_state(slave); 2328 info->link_failure_count = slave->link_failure_count; 2329 break; 2330 } 2331 } 2332 2333 read_unlock(&bond->lock); 2334 2335 return res; 2336 } 2337 2338 /*-------------------------------- Monitoring -------------------------------*/ 2339 2340 2341 static int bond_miimon_inspect(struct bonding *bond) 2342 { 2343 struct slave *slave; 2344 int i, link_state, commit = 0; 2345 bool ignore_updelay; 2346 2347 ignore_updelay = !bond->curr_active_slave ? true : false; 2348 2349 bond_for_each_slave(bond, slave, i) { 2350 slave->new_link = BOND_LINK_NOCHANGE; 2351 2352 link_state = bond_check_dev_link(bond, slave->dev, 0); 2353 2354 switch (slave->link) { 2355 case BOND_LINK_UP: 2356 if (link_state) 2357 continue; 2358 2359 slave->link = BOND_LINK_FAIL; 2360 slave->delay = bond->params.downdelay; 2361 if (slave->delay) { 2362 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n", 2363 bond->dev->name, 2364 (bond->params.mode == 2365 BOND_MODE_ACTIVEBACKUP) ? 2366 (bond_is_active_slave(slave) ? 2367 "active " : "backup ") : "", 2368 slave->dev->name, 2369 bond->params.downdelay * bond->params.miimon); 2370 } 2371 /*FALLTHRU*/ 2372 case BOND_LINK_FAIL: 2373 if (link_state) { 2374 /* 2375 * recovered before downdelay expired 2376 */ 2377 slave->link = BOND_LINK_UP; 2378 slave->jiffies = jiffies; 2379 pr_info("%s: link status up again after %d ms for interface %s.\n", 2380 bond->dev->name, 2381 (bond->params.downdelay - slave->delay) * 2382 bond->params.miimon, 2383 slave->dev->name); 2384 continue; 2385 } 2386 2387 if (slave->delay <= 0) { 2388 slave->new_link = BOND_LINK_DOWN; 2389 commit++; 2390 continue; 2391 } 2392 2393 slave->delay--; 2394 break; 2395 2396 case BOND_LINK_DOWN: 2397 if (!link_state) 2398 continue; 2399 2400 slave->link = BOND_LINK_BACK; 2401 slave->delay = bond->params.updelay; 2402 2403 if (slave->delay) { 2404 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n", 2405 bond->dev->name, slave->dev->name, 2406 ignore_updelay ? 0 : 2407 bond->params.updelay * 2408 bond->params.miimon); 2409 } 2410 /*FALLTHRU*/ 2411 case BOND_LINK_BACK: 2412 if (!link_state) { 2413 slave->link = BOND_LINK_DOWN; 2414 pr_info("%s: link status down again after %d ms for interface %s.\n", 2415 bond->dev->name, 2416 (bond->params.updelay - slave->delay) * 2417 bond->params.miimon, 2418 slave->dev->name); 2419 2420 continue; 2421 } 2422 2423 if (ignore_updelay) 2424 slave->delay = 0; 2425 2426 if (slave->delay <= 0) { 2427 slave->new_link = BOND_LINK_UP; 2428 commit++; 2429 ignore_updelay = false; 2430 continue; 2431 } 2432 2433 slave->delay--; 2434 break; 2435 } 2436 } 2437 2438 return commit; 2439 } 2440 2441 static void bond_miimon_commit(struct bonding *bond) 2442 { 2443 struct slave *slave; 2444 int i; 2445 2446 bond_for_each_slave(bond, slave, i) { 2447 switch (slave->new_link) { 2448 case BOND_LINK_NOCHANGE: 2449 continue; 2450 2451 case BOND_LINK_UP: 2452 slave->link = BOND_LINK_UP; 2453 slave->jiffies = jiffies; 2454 2455 if (bond->params.mode == BOND_MODE_8023AD) { 2456 /* prevent it from being the active one */ 2457 bond_set_backup_slave(slave); 2458 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) { 2459 /* make it immediately active */ 2460 bond_set_active_slave(slave); 2461 } else if (slave != bond->primary_slave) { 2462 /* prevent it from being the active one */ 2463 bond_set_backup_slave(slave); 2464 } 2465 2466 bond_update_speed_duplex(slave); 2467 2468 pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n", 2469 bond->dev->name, slave->dev->name, 2470 slave->speed, slave->duplex ? "full" : "half"); 2471 2472 /* notify ad that the link status has changed */ 2473 if (bond->params.mode == BOND_MODE_8023AD) 2474 bond_3ad_handle_link_change(slave, BOND_LINK_UP); 2475 2476 if (bond_is_lb(bond)) 2477 bond_alb_handle_link_change(bond, slave, 2478 BOND_LINK_UP); 2479 2480 if (!bond->curr_active_slave || 2481 (slave == bond->primary_slave)) 2482 goto do_failover; 2483 2484 continue; 2485 2486 case BOND_LINK_DOWN: 2487 if (slave->link_failure_count < UINT_MAX) 2488 slave->link_failure_count++; 2489 2490 slave->link = BOND_LINK_DOWN; 2491 2492 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP || 2493 bond->params.mode == BOND_MODE_8023AD) 2494 bond_set_slave_inactive_flags(slave); 2495 2496 pr_info("%s: link status definitely down for interface %s, disabling it\n", 2497 bond->dev->name, slave->dev->name); 2498 2499 if (bond->params.mode == BOND_MODE_8023AD) 2500 bond_3ad_handle_link_change(slave, 2501 BOND_LINK_DOWN); 2502 2503 if (bond_is_lb(bond)) 2504 bond_alb_handle_link_change(bond, slave, 2505 BOND_LINK_DOWN); 2506 2507 if (slave == bond->curr_active_slave) 2508 goto do_failover; 2509 2510 continue; 2511 2512 default: 2513 pr_err("%s: invalid new link %d on slave %s\n", 2514 bond->dev->name, slave->new_link, 2515 slave->dev->name); 2516 slave->new_link = BOND_LINK_NOCHANGE; 2517 2518 continue; 2519 } 2520 2521 do_failover: 2522 ASSERT_RTNL(); 2523 block_netpoll_tx(); 2524 write_lock_bh(&bond->curr_slave_lock); 2525 bond_select_active_slave(bond); 2526 write_unlock_bh(&bond->curr_slave_lock); 2527 unblock_netpoll_tx(); 2528 } 2529 2530 bond_set_carrier(bond); 2531 } 2532 2533 /* 2534 * bond_mii_monitor 2535 * 2536 * Really a wrapper that splits the mii monitor into two phases: an 2537 * inspection, then (if inspection indicates something needs to be done) 2538 * an acquisition of appropriate locks followed by a commit phase to 2539 * implement whatever link state changes are indicated. 2540 */ 2541 void bond_mii_monitor(struct work_struct *work) 2542 { 2543 struct bonding *bond = container_of(work, struct bonding, 2544 mii_work.work); 2545 bool should_notify_peers = false; 2546 unsigned long delay; 2547 2548 read_lock(&bond->lock); 2549 2550 delay = msecs_to_jiffies(bond->params.miimon); 2551 2552 if (bond->slave_cnt == 0) 2553 goto re_arm; 2554 2555 should_notify_peers = bond_should_notify_peers(bond); 2556 2557 if (bond_miimon_inspect(bond)) { 2558 read_unlock(&bond->lock); 2559 2560 /* Race avoidance with bond_close cancel of workqueue */ 2561 if (!rtnl_trylock()) { 2562 read_lock(&bond->lock); 2563 delay = 1; 2564 should_notify_peers = false; 2565 goto re_arm; 2566 } 2567 2568 read_lock(&bond->lock); 2569 2570 bond_miimon_commit(bond); 2571 2572 read_unlock(&bond->lock); 2573 rtnl_unlock(); /* might sleep, hold no other locks */ 2574 read_lock(&bond->lock); 2575 } 2576 2577 re_arm: 2578 if (bond->params.miimon) 2579 queue_delayed_work(bond->wq, &bond->mii_work, delay); 2580 2581 read_unlock(&bond->lock); 2582 2583 if (should_notify_peers) { 2584 if (!rtnl_trylock()) { 2585 read_lock(&bond->lock); 2586 bond->send_peer_notif++; 2587 read_unlock(&bond->lock); 2588 return; 2589 } 2590 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS); 2591 rtnl_unlock(); 2592 } 2593 } 2594 2595 static int bond_has_this_ip(struct bonding *bond, __be32 ip) 2596 { 2597 struct vlan_entry *vlan; 2598 struct net_device *vlan_dev; 2599 2600 if (ip == bond_confirm_addr(bond->dev, 0, ip)) 2601 return 1; 2602 2603 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 2604 rcu_read_lock(); 2605 vlan_dev = __vlan_find_dev_deep(bond->dev, vlan->vlan_id); 2606 rcu_read_unlock(); 2607 if (vlan_dev && ip == bond_confirm_addr(vlan_dev, 0, ip)) 2608 return 1; 2609 } 2610 2611 return 0; 2612 } 2613 2614 /* 2615 * We go to the (large) trouble of VLAN tagging ARP frames because 2616 * switches in VLAN mode (especially if ports are configured as 2617 * "native" to a VLAN) might not pass non-tagged frames. 2618 */ 2619 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id) 2620 { 2621 struct sk_buff *skb; 2622 2623 pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op, 2624 slave_dev->name, dest_ip, src_ip, vlan_id); 2625 2626 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2627 NULL, slave_dev->dev_addr, NULL); 2628 2629 if (!skb) { 2630 pr_err("ARP packet allocation failed\n"); 2631 return; 2632 } 2633 if (vlan_id) { 2634 skb = vlan_put_tag(skb, vlan_id); 2635 if (!skb) { 2636 pr_err("failed to insert VLAN tag\n"); 2637 return; 2638 } 2639 } 2640 arp_xmit(skb); 2641 } 2642 2643 2644 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2645 { 2646 int i, vlan_id; 2647 __be32 *targets = bond->params.arp_targets; 2648 struct vlan_entry *vlan; 2649 struct net_device *vlan_dev = NULL; 2650 struct rtable *rt; 2651 2652 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) { 2653 __be32 addr; 2654 if (!targets[i]) 2655 break; 2656 pr_debug("basa: target %x\n", targets[i]); 2657 if (!bond_vlan_used(bond)) { 2658 pr_debug("basa: empty vlan: arp_send\n"); 2659 addr = bond_confirm_addr(bond->dev, targets[i], 0); 2660 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2661 addr, 0); 2662 continue; 2663 } 2664 2665 /* 2666 * If VLANs are configured, we do a route lookup to 2667 * determine which VLAN interface would be used, so we 2668 * can tag the ARP with the proper VLAN tag. 2669 */ 2670 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 2671 RTO_ONLINK, 0); 2672 if (IS_ERR(rt)) { 2673 if (net_ratelimit()) { 2674 pr_warning("%s: no route to arp_ip_target %pI4\n", 2675 bond->dev->name, &targets[i]); 2676 } 2677 continue; 2678 } 2679 2680 /* 2681 * This target is not on a VLAN 2682 */ 2683 if (rt->dst.dev == bond->dev) { 2684 ip_rt_put(rt); 2685 pr_debug("basa: rtdev == bond->dev: arp_send\n"); 2686 addr = bond_confirm_addr(bond->dev, targets[i], 0); 2687 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2688 addr, 0); 2689 continue; 2690 } 2691 2692 vlan_id = 0; 2693 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 2694 rcu_read_lock(); 2695 vlan_dev = __vlan_find_dev_deep(bond->dev, 2696 vlan->vlan_id); 2697 rcu_read_unlock(); 2698 if (vlan_dev == rt->dst.dev) { 2699 vlan_id = vlan->vlan_id; 2700 pr_debug("basa: vlan match on %s %d\n", 2701 vlan_dev->name, vlan_id); 2702 break; 2703 } 2704 } 2705 2706 if (vlan_id && vlan_dev) { 2707 ip_rt_put(rt); 2708 addr = bond_confirm_addr(vlan_dev, targets[i], 0); 2709 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2710 addr, vlan_id); 2711 continue; 2712 } 2713 2714 if (net_ratelimit()) { 2715 pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n", 2716 bond->dev->name, &targets[i], 2717 rt->dst.dev ? rt->dst.dev->name : "NULL"); 2718 } 2719 ip_rt_put(rt); 2720 } 2721 } 2722 2723 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 2724 { 2725 int i; 2726 __be32 *targets = bond->params.arp_targets; 2727 2728 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) { 2729 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n", 2730 &sip, &tip, i, &targets[i], 2731 bond_has_this_ip(bond, tip)); 2732 if (sip == targets[i]) { 2733 if (bond_has_this_ip(bond, tip)) 2734 slave->last_arp_rx = jiffies; 2735 return; 2736 } 2737 } 2738 } 2739 2740 static int bond_arp_rcv(struct sk_buff *skb, struct bonding *bond, 2741 struct slave *slave) 2742 { 2743 struct arphdr *arp; 2744 unsigned char *arp_ptr; 2745 __be32 sip, tip; 2746 2747 if (skb->protocol != __cpu_to_be16(ETH_P_ARP)) 2748 return RX_HANDLER_ANOTHER; 2749 2750 read_lock(&bond->lock); 2751 2752 pr_debug("bond_arp_rcv: bond %s skb->dev %s\n", 2753 bond->dev->name, skb->dev->name); 2754 2755 if (!pskb_may_pull(skb, arp_hdr_len(bond->dev))) 2756 goto out_unlock; 2757 2758 arp = arp_hdr(skb); 2759 if (arp->ar_hln != bond->dev->addr_len || 2760 skb->pkt_type == PACKET_OTHERHOST || 2761 skb->pkt_type == PACKET_LOOPBACK || 2762 arp->ar_hrd != htons(ARPHRD_ETHER) || 2763 arp->ar_pro != htons(ETH_P_IP) || 2764 arp->ar_pln != 4) 2765 goto out_unlock; 2766 2767 arp_ptr = (unsigned char *)(arp + 1); 2768 arp_ptr += bond->dev->addr_len; 2769 memcpy(&sip, arp_ptr, 4); 2770 arp_ptr += 4 + bond->dev->addr_len; 2771 memcpy(&tip, arp_ptr, 4); 2772 2773 pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n", 2774 bond->dev->name, slave->dev->name, bond_slave_state(slave), 2775 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 2776 &sip, &tip); 2777 2778 /* 2779 * Backup slaves won't see the ARP reply, but do come through 2780 * here for each ARP probe (so we swap the sip/tip to validate 2781 * the probe). In a "redundant switch, common router" type of 2782 * configuration, the ARP probe will (hopefully) travel from 2783 * the active, through one switch, the router, then the other 2784 * switch before reaching the backup. 2785 */ 2786 if (bond_is_active_slave(slave)) 2787 bond_validate_arp(bond, slave, sip, tip); 2788 else 2789 bond_validate_arp(bond, slave, tip, sip); 2790 2791 out_unlock: 2792 read_unlock(&bond->lock); 2793 return RX_HANDLER_ANOTHER; 2794 } 2795 2796 /* 2797 * this function is called regularly to monitor each slave's link 2798 * ensuring that traffic is being sent and received when arp monitoring 2799 * is used in load-balancing mode. if the adapter has been dormant, then an 2800 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 2801 * arp monitoring in active backup mode. 2802 */ 2803 void bond_loadbalance_arp_mon(struct work_struct *work) 2804 { 2805 struct bonding *bond = container_of(work, struct bonding, 2806 arp_work.work); 2807 struct slave *slave, *oldcurrent; 2808 int do_failover = 0; 2809 int delta_in_ticks; 2810 int i; 2811 2812 read_lock(&bond->lock); 2813 2814 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2815 2816 if (bond->slave_cnt == 0) 2817 goto re_arm; 2818 2819 read_lock(&bond->curr_slave_lock); 2820 oldcurrent = bond->curr_active_slave; 2821 read_unlock(&bond->curr_slave_lock); 2822 2823 /* see if any of the previous devices are up now (i.e. they have 2824 * xmt and rcv traffic). the curr_active_slave does not come into 2825 * the picture unless it is null. also, slave->jiffies is not needed 2826 * here because we send an arp on each slave and give a slave as 2827 * long as it needs to get the tx/rx within the delta. 2828 * TODO: what about up/down delay in arp mode? it wasn't here before 2829 * so it can wait 2830 */ 2831 bond_for_each_slave(bond, slave, i) { 2832 unsigned long trans_start = dev_trans_start(slave->dev); 2833 2834 if (slave->link != BOND_LINK_UP) { 2835 if (time_in_range(jiffies, 2836 trans_start - delta_in_ticks, 2837 trans_start + delta_in_ticks) && 2838 time_in_range(jiffies, 2839 slave->dev->last_rx - delta_in_ticks, 2840 slave->dev->last_rx + delta_in_ticks)) { 2841 2842 slave->link = BOND_LINK_UP; 2843 bond_set_active_slave(slave); 2844 2845 /* primary_slave has no meaning in round-robin 2846 * mode. the window of a slave being up and 2847 * curr_active_slave being null after enslaving 2848 * is closed. 2849 */ 2850 if (!oldcurrent) { 2851 pr_info("%s: link status definitely up for interface %s, ", 2852 bond->dev->name, 2853 slave->dev->name); 2854 do_failover = 1; 2855 } else { 2856 pr_info("%s: interface %s is now up\n", 2857 bond->dev->name, 2858 slave->dev->name); 2859 } 2860 } 2861 } else { 2862 /* slave->link == BOND_LINK_UP */ 2863 2864 /* not all switches will respond to an arp request 2865 * when the source ip is 0, so don't take the link down 2866 * if we don't know our ip yet 2867 */ 2868 if (!time_in_range(jiffies, 2869 trans_start - delta_in_ticks, 2870 trans_start + 2 * delta_in_ticks) || 2871 !time_in_range(jiffies, 2872 slave->dev->last_rx - delta_in_ticks, 2873 slave->dev->last_rx + 2 * delta_in_ticks)) { 2874 2875 slave->link = BOND_LINK_DOWN; 2876 bond_set_backup_slave(slave); 2877 2878 if (slave->link_failure_count < UINT_MAX) 2879 slave->link_failure_count++; 2880 2881 pr_info("%s: interface %s is now down.\n", 2882 bond->dev->name, 2883 slave->dev->name); 2884 2885 if (slave == oldcurrent) 2886 do_failover = 1; 2887 } 2888 } 2889 2890 /* note: if switch is in round-robin mode, all links 2891 * must tx arp to ensure all links rx an arp - otherwise 2892 * links may oscillate or not come up at all; if switch is 2893 * in something like xor mode, there is nothing we can 2894 * do - all replies will be rx'ed on same link causing slaves 2895 * to be unstable during low/no traffic periods 2896 */ 2897 if (IS_UP(slave->dev)) 2898 bond_arp_send_all(bond, slave); 2899 } 2900 2901 if (do_failover) { 2902 block_netpoll_tx(); 2903 write_lock_bh(&bond->curr_slave_lock); 2904 2905 bond_select_active_slave(bond); 2906 2907 write_unlock_bh(&bond->curr_slave_lock); 2908 unblock_netpoll_tx(); 2909 } 2910 2911 re_arm: 2912 if (bond->params.arp_interval) 2913 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 2914 2915 read_unlock(&bond->lock); 2916 } 2917 2918 /* 2919 * Called to inspect slaves for active-backup mode ARP monitor link state 2920 * changes. Sets new_link in slaves to specify what action should take 2921 * place for the slave. Returns 0 if no changes are found, >0 if changes 2922 * to link states must be committed. 2923 * 2924 * Called with bond->lock held for read. 2925 */ 2926 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks) 2927 { 2928 struct slave *slave; 2929 int i, commit = 0; 2930 unsigned long trans_start; 2931 2932 bond_for_each_slave(bond, slave, i) { 2933 slave->new_link = BOND_LINK_NOCHANGE; 2934 2935 if (slave->link != BOND_LINK_UP) { 2936 if (time_in_range(jiffies, 2937 slave_last_rx(bond, slave) - delta_in_ticks, 2938 slave_last_rx(bond, slave) + delta_in_ticks)) { 2939 2940 slave->new_link = BOND_LINK_UP; 2941 commit++; 2942 } 2943 2944 continue; 2945 } 2946 2947 /* 2948 * Give slaves 2*delta after being enslaved or made 2949 * active. This avoids bouncing, as the last receive 2950 * times need a full ARP monitor cycle to be updated. 2951 */ 2952 if (time_in_range(jiffies, 2953 slave->jiffies - delta_in_ticks, 2954 slave->jiffies + 2 * delta_in_ticks)) 2955 continue; 2956 2957 /* 2958 * Backup slave is down if: 2959 * - No current_arp_slave AND 2960 * - more than 3*delta since last receive AND 2961 * - the bond has an IP address 2962 * 2963 * Note: a non-null current_arp_slave indicates 2964 * the curr_active_slave went down and we are 2965 * searching for a new one; under this condition 2966 * we only take the curr_active_slave down - this 2967 * gives each slave a chance to tx/rx traffic 2968 * before being taken out 2969 */ 2970 if (!bond_is_active_slave(slave) && 2971 !bond->current_arp_slave && 2972 !time_in_range(jiffies, 2973 slave_last_rx(bond, slave) - delta_in_ticks, 2974 slave_last_rx(bond, slave) + 3 * delta_in_ticks)) { 2975 2976 slave->new_link = BOND_LINK_DOWN; 2977 commit++; 2978 } 2979 2980 /* 2981 * Active slave is down if: 2982 * - more than 2*delta since transmitting OR 2983 * - (more than 2*delta since receive AND 2984 * the bond has an IP address) 2985 */ 2986 trans_start = dev_trans_start(slave->dev); 2987 if (bond_is_active_slave(slave) && 2988 (!time_in_range(jiffies, 2989 trans_start - delta_in_ticks, 2990 trans_start + 2 * delta_in_ticks) || 2991 !time_in_range(jiffies, 2992 slave_last_rx(bond, slave) - delta_in_ticks, 2993 slave_last_rx(bond, slave) + 2 * delta_in_ticks))) { 2994 2995 slave->new_link = BOND_LINK_DOWN; 2996 commit++; 2997 } 2998 } 2999 3000 return commit; 3001 } 3002 3003 /* 3004 * Called to commit link state changes noted by inspection step of 3005 * active-backup mode ARP monitor. 3006 * 3007 * Called with RTNL and bond->lock for read. 3008 */ 3009 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks) 3010 { 3011 struct slave *slave; 3012 int i; 3013 unsigned long trans_start; 3014 3015 bond_for_each_slave(bond, slave, i) { 3016 switch (slave->new_link) { 3017 case BOND_LINK_NOCHANGE: 3018 continue; 3019 3020 case BOND_LINK_UP: 3021 trans_start = dev_trans_start(slave->dev); 3022 if ((!bond->curr_active_slave && 3023 time_in_range(jiffies, 3024 trans_start - delta_in_ticks, 3025 trans_start + delta_in_ticks)) || 3026 bond->curr_active_slave != slave) { 3027 slave->link = BOND_LINK_UP; 3028 if (bond->current_arp_slave) { 3029 bond_set_slave_inactive_flags( 3030 bond->current_arp_slave); 3031 bond->current_arp_slave = NULL; 3032 } 3033 3034 pr_info("%s: link status definitely up for interface %s.\n", 3035 bond->dev->name, slave->dev->name); 3036 3037 if (!bond->curr_active_slave || 3038 (slave == bond->primary_slave)) 3039 goto do_failover; 3040 3041 } 3042 3043 continue; 3044 3045 case BOND_LINK_DOWN: 3046 if (slave->link_failure_count < UINT_MAX) 3047 slave->link_failure_count++; 3048 3049 slave->link = BOND_LINK_DOWN; 3050 bond_set_slave_inactive_flags(slave); 3051 3052 pr_info("%s: link status definitely down for interface %s, disabling it\n", 3053 bond->dev->name, slave->dev->name); 3054 3055 if (slave == bond->curr_active_slave) { 3056 bond->current_arp_slave = NULL; 3057 goto do_failover; 3058 } 3059 3060 continue; 3061 3062 default: 3063 pr_err("%s: impossible: new_link %d on slave %s\n", 3064 bond->dev->name, slave->new_link, 3065 slave->dev->name); 3066 continue; 3067 } 3068 3069 do_failover: 3070 ASSERT_RTNL(); 3071 block_netpoll_tx(); 3072 write_lock_bh(&bond->curr_slave_lock); 3073 bond_select_active_slave(bond); 3074 write_unlock_bh(&bond->curr_slave_lock); 3075 unblock_netpoll_tx(); 3076 } 3077 3078 bond_set_carrier(bond); 3079 } 3080 3081 /* 3082 * Send ARP probes for active-backup mode ARP monitor. 3083 * 3084 * Called with bond->lock held for read. 3085 */ 3086 static void bond_ab_arp_probe(struct bonding *bond) 3087 { 3088 struct slave *slave; 3089 int i; 3090 3091 read_lock(&bond->curr_slave_lock); 3092 3093 if (bond->current_arp_slave && bond->curr_active_slave) 3094 pr_info("PROBE: c_arp %s && cas %s BAD\n", 3095 bond->current_arp_slave->dev->name, 3096 bond->curr_active_slave->dev->name); 3097 3098 if (bond->curr_active_slave) { 3099 bond_arp_send_all(bond, bond->curr_active_slave); 3100 read_unlock(&bond->curr_slave_lock); 3101 return; 3102 } 3103 3104 read_unlock(&bond->curr_slave_lock); 3105 3106 /* if we don't have a curr_active_slave, search for the next available 3107 * backup slave from the current_arp_slave and make it the candidate 3108 * for becoming the curr_active_slave 3109 */ 3110 3111 if (!bond->current_arp_slave) { 3112 bond->current_arp_slave = bond->first_slave; 3113 if (!bond->current_arp_slave) 3114 return; 3115 } 3116 3117 bond_set_slave_inactive_flags(bond->current_arp_slave); 3118 3119 /* search for next candidate */ 3120 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) { 3121 if (IS_UP(slave->dev)) { 3122 slave->link = BOND_LINK_BACK; 3123 bond_set_slave_active_flags(slave); 3124 bond_arp_send_all(bond, slave); 3125 slave->jiffies = jiffies; 3126 bond->current_arp_slave = slave; 3127 break; 3128 } 3129 3130 /* if the link state is up at this point, we 3131 * mark it down - this can happen if we have 3132 * simultaneous link failures and 3133 * reselect_active_interface doesn't make this 3134 * one the current slave so it is still marked 3135 * up when it is actually down 3136 */ 3137 if (slave->link == BOND_LINK_UP) { 3138 slave->link = BOND_LINK_DOWN; 3139 if (slave->link_failure_count < UINT_MAX) 3140 slave->link_failure_count++; 3141 3142 bond_set_slave_inactive_flags(slave); 3143 3144 pr_info("%s: backup interface %s is now down.\n", 3145 bond->dev->name, slave->dev->name); 3146 } 3147 } 3148 } 3149 3150 void bond_activebackup_arp_mon(struct work_struct *work) 3151 { 3152 struct bonding *bond = container_of(work, struct bonding, 3153 arp_work.work); 3154 bool should_notify_peers = false; 3155 int delta_in_ticks; 3156 3157 read_lock(&bond->lock); 3158 3159 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3160 3161 if (bond->slave_cnt == 0) 3162 goto re_arm; 3163 3164 should_notify_peers = bond_should_notify_peers(bond); 3165 3166 if (bond_ab_arp_inspect(bond, delta_in_ticks)) { 3167 read_unlock(&bond->lock); 3168 3169 /* Race avoidance with bond_close flush of workqueue */ 3170 if (!rtnl_trylock()) { 3171 read_lock(&bond->lock); 3172 delta_in_ticks = 1; 3173 should_notify_peers = false; 3174 goto re_arm; 3175 } 3176 3177 read_lock(&bond->lock); 3178 3179 bond_ab_arp_commit(bond, delta_in_ticks); 3180 3181 read_unlock(&bond->lock); 3182 rtnl_unlock(); 3183 read_lock(&bond->lock); 3184 } 3185 3186 bond_ab_arp_probe(bond); 3187 3188 re_arm: 3189 if (bond->params.arp_interval) 3190 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 3191 3192 read_unlock(&bond->lock); 3193 3194 if (should_notify_peers) { 3195 if (!rtnl_trylock()) { 3196 read_lock(&bond->lock); 3197 bond->send_peer_notif++; 3198 read_unlock(&bond->lock); 3199 return; 3200 } 3201 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS); 3202 rtnl_unlock(); 3203 } 3204 } 3205 3206 /*-------------------------- netdev event handling --------------------------*/ 3207 3208 /* 3209 * Change device name 3210 */ 3211 static int bond_event_changename(struct bonding *bond) 3212 { 3213 bond_remove_proc_entry(bond); 3214 bond_create_proc_entry(bond); 3215 3216 bond_debug_reregister(bond); 3217 3218 return NOTIFY_DONE; 3219 } 3220 3221 static int bond_master_netdev_event(unsigned long event, 3222 struct net_device *bond_dev) 3223 { 3224 struct bonding *event_bond = netdev_priv(bond_dev); 3225 3226 switch (event) { 3227 case NETDEV_CHANGENAME: 3228 return bond_event_changename(event_bond); 3229 default: 3230 break; 3231 } 3232 3233 return NOTIFY_DONE; 3234 } 3235 3236 static int bond_slave_netdev_event(unsigned long event, 3237 struct net_device *slave_dev) 3238 { 3239 struct net_device *bond_dev = slave_dev->master; 3240 struct bonding *bond = netdev_priv(bond_dev); 3241 struct slave *slave = NULL; 3242 3243 switch (event) { 3244 case NETDEV_UNREGISTER: 3245 if (bond_dev) { 3246 if (bond->setup_by_slave) 3247 bond_release_and_destroy(bond_dev, slave_dev); 3248 else 3249 bond_release(bond_dev, slave_dev); 3250 } 3251 break; 3252 case NETDEV_UP: 3253 case NETDEV_CHANGE: 3254 slave = bond_get_slave_by_dev(bond, slave_dev); 3255 if (slave) { 3256 u32 old_speed = slave->speed; 3257 u8 old_duplex = slave->duplex; 3258 3259 bond_update_speed_duplex(slave); 3260 3261 if (bond->params.mode == BOND_MODE_8023AD) { 3262 if (old_speed != slave->speed) 3263 bond_3ad_adapter_speed_changed(slave); 3264 if (old_duplex != slave->duplex) 3265 bond_3ad_adapter_duplex_changed(slave); 3266 } 3267 } 3268 3269 break; 3270 case NETDEV_DOWN: 3271 /* 3272 * ... Or is it this? 3273 */ 3274 break; 3275 case NETDEV_CHANGEMTU: 3276 /* 3277 * TODO: Should slaves be allowed to 3278 * independently alter their MTU? For 3279 * an active-backup bond, slaves need 3280 * not be the same type of device, so 3281 * MTUs may vary. For other modes, 3282 * slaves arguably should have the 3283 * same MTUs. To do this, we'd need to 3284 * take over the slave's change_mtu 3285 * function for the duration of their 3286 * servitude. 3287 */ 3288 break; 3289 case NETDEV_CHANGENAME: 3290 /* 3291 * TODO: handle changing the primary's name 3292 */ 3293 break; 3294 case NETDEV_FEAT_CHANGE: 3295 bond_compute_features(bond); 3296 break; 3297 default: 3298 break; 3299 } 3300 3301 return NOTIFY_DONE; 3302 } 3303 3304 /* 3305 * bond_netdev_event: handle netdev notifier chain events. 3306 * 3307 * This function receives events for the netdev chain. The caller (an 3308 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 3309 * locks for us to safely manipulate the slave devices (RTNL lock, 3310 * dev_probe_lock). 3311 */ 3312 static int bond_netdev_event(struct notifier_block *this, 3313 unsigned long event, void *ptr) 3314 { 3315 struct net_device *event_dev = (struct net_device *)ptr; 3316 3317 pr_debug("event_dev: %s, event: %lx\n", 3318 event_dev ? event_dev->name : "None", 3319 event); 3320 3321 if (!(event_dev->priv_flags & IFF_BONDING)) 3322 return NOTIFY_DONE; 3323 3324 if (event_dev->flags & IFF_MASTER) { 3325 pr_debug("IFF_MASTER\n"); 3326 return bond_master_netdev_event(event, event_dev); 3327 } 3328 3329 if (event_dev->flags & IFF_SLAVE) { 3330 pr_debug("IFF_SLAVE\n"); 3331 return bond_slave_netdev_event(event, event_dev); 3332 } 3333 3334 return NOTIFY_DONE; 3335 } 3336 3337 static struct notifier_block bond_netdev_notifier = { 3338 .notifier_call = bond_netdev_event, 3339 }; 3340 3341 /*---------------------------- Hashing Policies -----------------------------*/ 3342 3343 /* 3344 * Hash for the output device based upon layer 2 and layer 3 data. If 3345 * the packet is not IP mimic bond_xmit_hash_policy_l2() 3346 */ 3347 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count) 3348 { 3349 struct ethhdr *data = (struct ethhdr *)skb->data; 3350 struct iphdr *iph = ip_hdr(skb); 3351 3352 if (skb->protocol == htons(ETH_P_IP)) { 3353 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^ 3354 (data->h_dest[5] ^ data->h_source[5])) % count; 3355 } 3356 3357 return (data->h_dest[5] ^ data->h_source[5]) % count; 3358 } 3359 3360 /* 3361 * Hash for the output device based upon layer 3 and layer 4 data. If 3362 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is 3363 * altogether not IP, mimic bond_xmit_hash_policy_l2() 3364 */ 3365 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count) 3366 { 3367 struct ethhdr *data = (struct ethhdr *)skb->data; 3368 struct iphdr *iph = ip_hdr(skb); 3369 __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl); 3370 int layer4_xor = 0; 3371 3372 if (skb->protocol == htons(ETH_P_IP)) { 3373 if (!ip_is_fragment(iph) && 3374 (iph->protocol == IPPROTO_TCP || 3375 iph->protocol == IPPROTO_UDP)) { 3376 layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1))); 3377 } 3378 return (layer4_xor ^ 3379 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count; 3380 3381 } 3382 3383 return (data->h_dest[5] ^ data->h_source[5]) % count; 3384 } 3385 3386 /* 3387 * Hash for the output device based upon layer 2 data 3388 */ 3389 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count) 3390 { 3391 struct ethhdr *data = (struct ethhdr *)skb->data; 3392 3393 return (data->h_dest[5] ^ data->h_source[5]) % count; 3394 } 3395 3396 /*-------------------------- Device entry points ----------------------------*/ 3397 3398 static int bond_open(struct net_device *bond_dev) 3399 { 3400 struct bonding *bond = netdev_priv(bond_dev); 3401 struct slave *slave; 3402 int i; 3403 3404 /* reset slave->backup and slave->inactive */ 3405 read_lock(&bond->lock); 3406 if (bond->slave_cnt > 0) { 3407 read_lock(&bond->curr_slave_lock); 3408 bond_for_each_slave(bond, slave, i) { 3409 if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) 3410 && (slave != bond->curr_active_slave)) { 3411 bond_set_slave_inactive_flags(slave); 3412 } else { 3413 bond_set_slave_active_flags(slave); 3414 } 3415 } 3416 read_unlock(&bond->curr_slave_lock); 3417 } 3418 read_unlock(&bond->lock); 3419 3420 INIT_DELAYED_WORK(&bond->mcast_work, bond_resend_igmp_join_requests_delayed); 3421 3422 if (bond_is_lb(bond)) { 3423 /* bond_alb_initialize must be called before the timer 3424 * is started. 3425 */ 3426 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) { 3427 /* something went wrong - fail the open operation */ 3428 return -ENOMEM; 3429 } 3430 3431 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 3432 queue_delayed_work(bond->wq, &bond->alb_work, 0); 3433 } 3434 3435 if (bond->params.miimon) { /* link check interval, in milliseconds. */ 3436 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 3437 queue_delayed_work(bond->wq, &bond->mii_work, 0); 3438 } 3439 3440 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 3441 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) 3442 INIT_DELAYED_WORK(&bond->arp_work, 3443 bond_activebackup_arp_mon); 3444 else 3445 INIT_DELAYED_WORK(&bond->arp_work, 3446 bond_loadbalance_arp_mon); 3447 3448 queue_delayed_work(bond->wq, &bond->arp_work, 0); 3449 if (bond->params.arp_validate) 3450 bond->recv_probe = bond_arp_rcv; 3451 } 3452 3453 if (bond->params.mode == BOND_MODE_8023AD) { 3454 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 3455 queue_delayed_work(bond->wq, &bond->ad_work, 0); 3456 /* register to receive LACPDUs */ 3457 bond->recv_probe = bond_3ad_lacpdu_recv; 3458 bond_3ad_initiate_agg_selection(bond, 1); 3459 } 3460 3461 return 0; 3462 } 3463 3464 static int bond_close(struct net_device *bond_dev) 3465 { 3466 struct bonding *bond = netdev_priv(bond_dev); 3467 3468 write_lock_bh(&bond->lock); 3469 3470 bond->send_peer_notif = 0; 3471 3472 write_unlock_bh(&bond->lock); 3473 3474 if (bond->params.miimon) { /* link check interval, in milliseconds. */ 3475 cancel_delayed_work_sync(&bond->mii_work); 3476 } 3477 3478 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 3479 cancel_delayed_work_sync(&bond->arp_work); 3480 } 3481 3482 switch (bond->params.mode) { 3483 case BOND_MODE_8023AD: 3484 cancel_delayed_work_sync(&bond->ad_work); 3485 break; 3486 case BOND_MODE_TLB: 3487 case BOND_MODE_ALB: 3488 cancel_delayed_work_sync(&bond->alb_work); 3489 break; 3490 default: 3491 break; 3492 } 3493 3494 if (delayed_work_pending(&bond->mcast_work)) 3495 cancel_delayed_work_sync(&bond->mcast_work); 3496 3497 if (bond_is_lb(bond)) { 3498 /* Must be called only after all 3499 * slaves have been released 3500 */ 3501 bond_alb_deinitialize(bond); 3502 } 3503 bond->recv_probe = NULL; 3504 3505 return 0; 3506 } 3507 3508 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev, 3509 struct rtnl_link_stats64 *stats) 3510 { 3511 struct bonding *bond = netdev_priv(bond_dev); 3512 struct rtnl_link_stats64 temp; 3513 struct slave *slave; 3514 int i; 3515 3516 memset(stats, 0, sizeof(*stats)); 3517 3518 read_lock_bh(&bond->lock); 3519 3520 bond_for_each_slave(bond, slave, i) { 3521 const struct rtnl_link_stats64 *sstats = 3522 dev_get_stats(slave->dev, &temp); 3523 3524 stats->rx_packets += sstats->rx_packets; 3525 stats->rx_bytes += sstats->rx_bytes; 3526 stats->rx_errors += sstats->rx_errors; 3527 stats->rx_dropped += sstats->rx_dropped; 3528 3529 stats->tx_packets += sstats->tx_packets; 3530 stats->tx_bytes += sstats->tx_bytes; 3531 stats->tx_errors += sstats->tx_errors; 3532 stats->tx_dropped += sstats->tx_dropped; 3533 3534 stats->multicast += sstats->multicast; 3535 stats->collisions += sstats->collisions; 3536 3537 stats->rx_length_errors += sstats->rx_length_errors; 3538 stats->rx_over_errors += sstats->rx_over_errors; 3539 stats->rx_crc_errors += sstats->rx_crc_errors; 3540 stats->rx_frame_errors += sstats->rx_frame_errors; 3541 stats->rx_fifo_errors += sstats->rx_fifo_errors; 3542 stats->rx_missed_errors += sstats->rx_missed_errors; 3543 3544 stats->tx_aborted_errors += sstats->tx_aborted_errors; 3545 stats->tx_carrier_errors += sstats->tx_carrier_errors; 3546 stats->tx_fifo_errors += sstats->tx_fifo_errors; 3547 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors; 3548 stats->tx_window_errors += sstats->tx_window_errors; 3549 } 3550 3551 read_unlock_bh(&bond->lock); 3552 3553 return stats; 3554 } 3555 3556 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 3557 { 3558 struct net_device *slave_dev = NULL; 3559 struct ifbond k_binfo; 3560 struct ifbond __user *u_binfo = NULL; 3561 struct ifslave k_sinfo; 3562 struct ifslave __user *u_sinfo = NULL; 3563 struct mii_ioctl_data *mii = NULL; 3564 int res = 0; 3565 3566 pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd); 3567 3568 switch (cmd) { 3569 case SIOCGMIIPHY: 3570 mii = if_mii(ifr); 3571 if (!mii) 3572 return -EINVAL; 3573 3574 mii->phy_id = 0; 3575 /* Fall Through */ 3576 case SIOCGMIIREG: 3577 /* 3578 * We do this again just in case we were called by SIOCGMIIREG 3579 * instead of SIOCGMIIPHY. 3580 */ 3581 mii = if_mii(ifr); 3582 if (!mii) 3583 return -EINVAL; 3584 3585 3586 if (mii->reg_num == 1) { 3587 struct bonding *bond = netdev_priv(bond_dev); 3588 mii->val_out = 0; 3589 read_lock(&bond->lock); 3590 read_lock(&bond->curr_slave_lock); 3591 if (netif_carrier_ok(bond->dev)) 3592 mii->val_out = BMSR_LSTATUS; 3593 3594 read_unlock(&bond->curr_slave_lock); 3595 read_unlock(&bond->lock); 3596 } 3597 3598 return 0; 3599 case BOND_INFO_QUERY_OLD: 3600 case SIOCBONDINFOQUERY: 3601 u_binfo = (struct ifbond __user *)ifr->ifr_data; 3602 3603 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 3604 return -EFAULT; 3605 3606 res = bond_info_query(bond_dev, &k_binfo); 3607 if (res == 0 && 3608 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 3609 return -EFAULT; 3610 3611 return res; 3612 case BOND_SLAVE_INFO_QUERY_OLD: 3613 case SIOCBONDSLAVEINFOQUERY: 3614 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 3615 3616 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 3617 return -EFAULT; 3618 3619 res = bond_slave_info_query(bond_dev, &k_sinfo); 3620 if (res == 0 && 3621 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 3622 return -EFAULT; 3623 3624 return res; 3625 default: 3626 /* Go on */ 3627 break; 3628 } 3629 3630 if (!capable(CAP_NET_ADMIN)) 3631 return -EPERM; 3632 3633 slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave); 3634 3635 pr_debug("slave_dev=%p:\n", slave_dev); 3636 3637 if (!slave_dev) 3638 res = -ENODEV; 3639 else { 3640 pr_debug("slave_dev->name=%s:\n", slave_dev->name); 3641 switch (cmd) { 3642 case BOND_ENSLAVE_OLD: 3643 case SIOCBONDENSLAVE: 3644 res = bond_enslave(bond_dev, slave_dev); 3645 break; 3646 case BOND_RELEASE_OLD: 3647 case SIOCBONDRELEASE: 3648 res = bond_release(bond_dev, slave_dev); 3649 break; 3650 case BOND_SETHWADDR_OLD: 3651 case SIOCBONDSETHWADDR: 3652 res = bond_sethwaddr(bond_dev, slave_dev); 3653 break; 3654 case BOND_CHANGE_ACTIVE_OLD: 3655 case SIOCBONDCHANGEACTIVE: 3656 res = bond_ioctl_change_active(bond_dev, slave_dev); 3657 break; 3658 default: 3659 res = -EOPNOTSUPP; 3660 } 3661 3662 dev_put(slave_dev); 3663 } 3664 3665 return res; 3666 } 3667 3668 static bool bond_addr_in_mc_list(unsigned char *addr, 3669 struct netdev_hw_addr_list *list, 3670 int addrlen) 3671 { 3672 struct netdev_hw_addr *ha; 3673 3674 netdev_hw_addr_list_for_each(ha, list) 3675 if (!memcmp(ha->addr, addr, addrlen)) 3676 return true; 3677 3678 return false; 3679 } 3680 3681 static void bond_change_rx_flags(struct net_device *bond_dev, int change) 3682 { 3683 struct bonding *bond = netdev_priv(bond_dev); 3684 3685 if (change & IFF_PROMISC) 3686 bond_set_promiscuity(bond, 3687 bond_dev->flags & IFF_PROMISC ? 1 : -1); 3688 3689 if (change & IFF_ALLMULTI) 3690 bond_set_allmulti(bond, 3691 bond_dev->flags & IFF_ALLMULTI ? 1 : -1); 3692 } 3693 3694 static void bond_set_multicast_list(struct net_device *bond_dev) 3695 { 3696 struct bonding *bond = netdev_priv(bond_dev); 3697 struct netdev_hw_addr *ha; 3698 bool found; 3699 3700 read_lock(&bond->lock); 3701 3702 /* looking for addresses to add to slaves' mc list */ 3703 netdev_for_each_mc_addr(ha, bond_dev) { 3704 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list, 3705 bond_dev->addr_len); 3706 if (!found) 3707 bond_mc_add(bond, ha->addr); 3708 } 3709 3710 /* looking for addresses to delete from slaves' list */ 3711 netdev_hw_addr_list_for_each(ha, &bond->mc_list) { 3712 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc, 3713 bond_dev->addr_len); 3714 if (!found) 3715 bond_mc_del(bond, ha->addr); 3716 } 3717 3718 /* save master's multicast list */ 3719 __hw_addr_flush(&bond->mc_list); 3720 __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc, 3721 bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST); 3722 3723 read_unlock(&bond->lock); 3724 } 3725 3726 static int bond_neigh_init(struct neighbour *n) 3727 { 3728 struct bonding *bond = netdev_priv(n->dev); 3729 struct slave *slave = bond->first_slave; 3730 const struct net_device_ops *slave_ops; 3731 struct neigh_parms parms; 3732 int ret; 3733 3734 if (!slave) 3735 return 0; 3736 3737 slave_ops = slave->dev->netdev_ops; 3738 3739 if (!slave_ops->ndo_neigh_setup) 3740 return 0; 3741 3742 parms.neigh_setup = NULL; 3743 parms.neigh_cleanup = NULL; 3744 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); 3745 if (ret) 3746 return ret; 3747 3748 /* 3749 * Assign slave's neigh_cleanup to neighbour in case cleanup is called 3750 * after the last slave has been detached. Assumes that all slaves 3751 * utilize the same neigh_cleanup (true at this writing as only user 3752 * is ipoib). 3753 */ 3754 n->parms->neigh_cleanup = parms.neigh_cleanup; 3755 3756 if (!parms.neigh_setup) 3757 return 0; 3758 3759 return parms.neigh_setup(n); 3760 } 3761 3762 /* 3763 * The bonding ndo_neigh_setup is called at init time beofre any 3764 * slave exists. So we must declare proxy setup function which will 3765 * be used at run time to resolve the actual slave neigh param setup. 3766 */ 3767 static int bond_neigh_setup(struct net_device *dev, 3768 struct neigh_parms *parms) 3769 { 3770 parms->neigh_setup = bond_neigh_init; 3771 3772 return 0; 3773 } 3774 3775 /* 3776 * Change the MTU of all of a master's slaves to match the master 3777 */ 3778 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 3779 { 3780 struct bonding *bond = netdev_priv(bond_dev); 3781 struct slave *slave, *stop_at; 3782 int res = 0; 3783 int i; 3784 3785 pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond, 3786 (bond_dev ? bond_dev->name : "None"), new_mtu); 3787 3788 /* Can't hold bond->lock with bh disabled here since 3789 * some base drivers panic. On the other hand we can't 3790 * hold bond->lock without bh disabled because we'll 3791 * deadlock. The only solution is to rely on the fact 3792 * that we're under rtnl_lock here, and the slaves 3793 * list won't change. This doesn't solve the problem 3794 * of setting the slave's MTU while it is 3795 * transmitting, but the assumption is that the base 3796 * driver can handle that. 3797 * 3798 * TODO: figure out a way to safely iterate the slaves 3799 * list, but without holding a lock around the actual 3800 * call to the base driver. 3801 */ 3802 3803 bond_for_each_slave(bond, slave, i) { 3804 pr_debug("s %p s->p %p c_m %p\n", 3805 slave, 3806 slave->prev, 3807 slave->dev->netdev_ops->ndo_change_mtu); 3808 3809 res = dev_set_mtu(slave->dev, new_mtu); 3810 3811 if (res) { 3812 /* If we failed to set the slave's mtu to the new value 3813 * we must abort the operation even in ACTIVE_BACKUP 3814 * mode, because if we allow the backup slaves to have 3815 * different mtu values than the active slave we'll 3816 * need to change their mtu when doing a failover. That 3817 * means changing their mtu from timer context, which 3818 * is probably not a good idea. 3819 */ 3820 pr_debug("err %d %s\n", res, slave->dev->name); 3821 goto unwind; 3822 } 3823 } 3824 3825 bond_dev->mtu = new_mtu; 3826 3827 return 0; 3828 3829 unwind: 3830 /* unwind from head to the slave that failed */ 3831 stop_at = slave; 3832 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { 3833 int tmp_res; 3834 3835 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu); 3836 if (tmp_res) { 3837 pr_debug("unwind err %d dev %s\n", 3838 tmp_res, slave->dev->name); 3839 } 3840 } 3841 3842 return res; 3843 } 3844 3845 /* 3846 * Change HW address 3847 * 3848 * Note that many devices must be down to change the HW address, and 3849 * downing the master releases all slaves. We can make bonds full of 3850 * bonding devices to test this, however. 3851 */ 3852 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 3853 { 3854 struct bonding *bond = netdev_priv(bond_dev); 3855 struct sockaddr *sa = addr, tmp_sa; 3856 struct slave *slave, *stop_at; 3857 int res = 0; 3858 int i; 3859 3860 if (bond->params.mode == BOND_MODE_ALB) 3861 return bond_alb_set_mac_address(bond_dev, addr); 3862 3863 3864 pr_debug("bond=%p, name=%s\n", 3865 bond, bond_dev ? bond_dev->name : "None"); 3866 3867 /* 3868 * If fail_over_mac is set to active, do nothing and return 3869 * success. Returning an error causes ifenslave to fail. 3870 */ 3871 if (bond->params.fail_over_mac == BOND_FOM_ACTIVE) 3872 return 0; 3873 3874 if (!is_valid_ether_addr(sa->sa_data)) 3875 return -EADDRNOTAVAIL; 3876 3877 /* Can't hold bond->lock with bh disabled here since 3878 * some base drivers panic. On the other hand we can't 3879 * hold bond->lock without bh disabled because we'll 3880 * deadlock. The only solution is to rely on the fact 3881 * that we're under rtnl_lock here, and the slaves 3882 * list won't change. This doesn't solve the problem 3883 * of setting the slave's hw address while it is 3884 * transmitting, but the assumption is that the base 3885 * driver can handle that. 3886 * 3887 * TODO: figure out a way to safely iterate the slaves 3888 * list, but without holding a lock around the actual 3889 * call to the base driver. 3890 */ 3891 3892 bond_for_each_slave(bond, slave, i) { 3893 const struct net_device_ops *slave_ops = slave->dev->netdev_ops; 3894 pr_debug("slave %p %s\n", slave, slave->dev->name); 3895 3896 if (slave_ops->ndo_set_mac_address == NULL) { 3897 res = -EOPNOTSUPP; 3898 pr_debug("EOPNOTSUPP %s\n", slave->dev->name); 3899 goto unwind; 3900 } 3901 3902 res = dev_set_mac_address(slave->dev, addr); 3903 if (res) { 3904 /* TODO: consider downing the slave 3905 * and retry ? 3906 * User should expect communications 3907 * breakage anyway until ARP finish 3908 * updating, so... 3909 */ 3910 pr_debug("err %d %s\n", res, slave->dev->name); 3911 goto unwind; 3912 } 3913 } 3914 3915 /* success */ 3916 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); 3917 return 0; 3918 3919 unwind: 3920 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 3921 tmp_sa.sa_family = bond_dev->type; 3922 3923 /* unwind from head to the slave that failed */ 3924 stop_at = slave; 3925 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { 3926 int tmp_res; 3927 3928 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa); 3929 if (tmp_res) { 3930 pr_debug("unwind err %d dev %s\n", 3931 tmp_res, slave->dev->name); 3932 } 3933 } 3934 3935 return res; 3936 } 3937 3938 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev) 3939 { 3940 struct bonding *bond = netdev_priv(bond_dev); 3941 struct slave *slave, *start_at; 3942 int i, slave_no, res = 1; 3943 struct iphdr *iph = ip_hdr(skb); 3944 3945 /* 3946 * Start with the curr_active_slave that joined the bond as the 3947 * default for sending IGMP traffic. For failover purposes one 3948 * needs to maintain some consistency for the interface that will 3949 * send the join/membership reports. The curr_active_slave found 3950 * will send all of this type of traffic. 3951 */ 3952 if ((iph->protocol == IPPROTO_IGMP) && 3953 (skb->protocol == htons(ETH_P_IP))) { 3954 3955 read_lock(&bond->curr_slave_lock); 3956 slave = bond->curr_active_slave; 3957 read_unlock(&bond->curr_slave_lock); 3958 3959 if (!slave) 3960 goto out; 3961 } else { 3962 /* 3963 * Concurrent TX may collide on rr_tx_counter; we accept 3964 * that as being rare enough not to justify using an 3965 * atomic op here. 3966 */ 3967 slave_no = bond->rr_tx_counter++ % bond->slave_cnt; 3968 3969 bond_for_each_slave(bond, slave, i) { 3970 slave_no--; 3971 if (slave_no < 0) 3972 break; 3973 } 3974 } 3975 3976 start_at = slave; 3977 bond_for_each_slave_from(bond, slave, i, start_at) { 3978 if (IS_UP(slave->dev) && 3979 (slave->link == BOND_LINK_UP) && 3980 bond_is_active_slave(slave)) { 3981 res = bond_dev_queue_xmit(bond, skb, slave->dev); 3982 break; 3983 } 3984 } 3985 3986 out: 3987 if (res) { 3988 /* no suitable interface, frame not sent */ 3989 dev_kfree_skb(skb); 3990 } 3991 3992 return NETDEV_TX_OK; 3993 } 3994 3995 3996 /* 3997 * in active-backup mode, we know that bond->curr_active_slave is always valid if 3998 * the bond has a usable interface. 3999 */ 4000 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev) 4001 { 4002 struct bonding *bond = netdev_priv(bond_dev); 4003 int res = 1; 4004 4005 read_lock(&bond->curr_slave_lock); 4006 4007 if (bond->curr_active_slave) 4008 res = bond_dev_queue_xmit(bond, skb, 4009 bond->curr_active_slave->dev); 4010 4011 if (res) 4012 /* no suitable interface, frame not sent */ 4013 dev_kfree_skb(skb); 4014 4015 read_unlock(&bond->curr_slave_lock); 4016 4017 return NETDEV_TX_OK; 4018 } 4019 4020 /* 4021 * In bond_xmit_xor() , we determine the output device by using a pre- 4022 * determined xmit_hash_policy(), If the selected device is not enabled, 4023 * find the next active slave. 4024 */ 4025 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev) 4026 { 4027 struct bonding *bond = netdev_priv(bond_dev); 4028 struct slave *slave, *start_at; 4029 int slave_no; 4030 int i; 4031 int res = 1; 4032 4033 slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt); 4034 4035 bond_for_each_slave(bond, slave, i) { 4036 slave_no--; 4037 if (slave_no < 0) 4038 break; 4039 } 4040 4041 start_at = slave; 4042 4043 bond_for_each_slave_from(bond, slave, i, start_at) { 4044 if (IS_UP(slave->dev) && 4045 (slave->link == BOND_LINK_UP) && 4046 bond_is_active_slave(slave)) { 4047 res = bond_dev_queue_xmit(bond, skb, slave->dev); 4048 break; 4049 } 4050 } 4051 4052 if (res) { 4053 /* no suitable interface, frame not sent */ 4054 dev_kfree_skb(skb); 4055 } 4056 4057 return NETDEV_TX_OK; 4058 } 4059 4060 /* 4061 * in broadcast mode, we send everything to all usable interfaces. 4062 */ 4063 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev) 4064 { 4065 struct bonding *bond = netdev_priv(bond_dev); 4066 struct slave *slave, *start_at; 4067 struct net_device *tx_dev = NULL; 4068 int i; 4069 int res = 1; 4070 4071 read_lock(&bond->curr_slave_lock); 4072 start_at = bond->curr_active_slave; 4073 read_unlock(&bond->curr_slave_lock); 4074 4075 if (!start_at) 4076 goto out; 4077 4078 bond_for_each_slave_from(bond, slave, i, start_at) { 4079 if (IS_UP(slave->dev) && 4080 (slave->link == BOND_LINK_UP) && 4081 bond_is_active_slave(slave)) { 4082 if (tx_dev) { 4083 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 4084 if (!skb2) { 4085 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n", 4086 bond_dev->name); 4087 continue; 4088 } 4089 4090 res = bond_dev_queue_xmit(bond, skb2, tx_dev); 4091 if (res) { 4092 dev_kfree_skb(skb2); 4093 continue; 4094 } 4095 } 4096 tx_dev = slave->dev; 4097 } 4098 } 4099 4100 if (tx_dev) 4101 res = bond_dev_queue_xmit(bond, skb, tx_dev); 4102 4103 out: 4104 if (res) 4105 /* no suitable interface, frame not sent */ 4106 dev_kfree_skb(skb); 4107 4108 /* frame sent to all suitable interfaces */ 4109 return NETDEV_TX_OK; 4110 } 4111 4112 /*------------------------- Device initialization ---------------------------*/ 4113 4114 static void bond_set_xmit_hash_policy(struct bonding *bond) 4115 { 4116 switch (bond->params.xmit_policy) { 4117 case BOND_XMIT_POLICY_LAYER23: 4118 bond->xmit_hash_policy = bond_xmit_hash_policy_l23; 4119 break; 4120 case BOND_XMIT_POLICY_LAYER34: 4121 bond->xmit_hash_policy = bond_xmit_hash_policy_l34; 4122 break; 4123 case BOND_XMIT_POLICY_LAYER2: 4124 default: 4125 bond->xmit_hash_policy = bond_xmit_hash_policy_l2; 4126 break; 4127 } 4128 } 4129 4130 /* 4131 * Lookup the slave that corresponds to a qid 4132 */ 4133 static inline int bond_slave_override(struct bonding *bond, 4134 struct sk_buff *skb) 4135 { 4136 int i, res = 1; 4137 struct slave *slave = NULL; 4138 struct slave *check_slave; 4139 4140 if (!skb->queue_mapping) 4141 return 1; 4142 4143 /* Find out if any slaves have the same mapping as this skb. */ 4144 bond_for_each_slave(bond, check_slave, i) { 4145 if (check_slave->queue_id == skb->queue_mapping) { 4146 slave = check_slave; 4147 break; 4148 } 4149 } 4150 4151 /* If the slave isn't UP, use default transmit policy. */ 4152 if (slave && slave->queue_id && IS_UP(slave->dev) && 4153 (slave->link == BOND_LINK_UP)) { 4154 res = bond_dev_queue_xmit(bond, skb, slave->dev); 4155 } 4156 4157 return res; 4158 } 4159 4160 4161 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb) 4162 { 4163 /* 4164 * This helper function exists to help dev_pick_tx get the correct 4165 * destination queue. Using a helper function skips a call to 4166 * skb_tx_hash and will put the skbs in the queue we expect on their 4167 * way down to the bonding driver. 4168 */ 4169 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 4170 4171 /* 4172 * Save the original txq to restore before passing to the driver 4173 */ 4174 bond_queue_mapping(skb) = skb->queue_mapping; 4175 4176 if (unlikely(txq >= dev->real_num_tx_queues)) { 4177 do { 4178 txq -= dev->real_num_tx_queues; 4179 } while (txq >= dev->real_num_tx_queues); 4180 } 4181 return txq; 4182 } 4183 4184 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4185 { 4186 struct bonding *bond = netdev_priv(dev); 4187 4188 if (TX_QUEUE_OVERRIDE(bond->params.mode)) { 4189 if (!bond_slave_override(bond, skb)) 4190 return NETDEV_TX_OK; 4191 } 4192 4193 switch (bond->params.mode) { 4194 case BOND_MODE_ROUNDROBIN: 4195 return bond_xmit_roundrobin(skb, dev); 4196 case BOND_MODE_ACTIVEBACKUP: 4197 return bond_xmit_activebackup(skb, dev); 4198 case BOND_MODE_XOR: 4199 return bond_xmit_xor(skb, dev); 4200 case BOND_MODE_BROADCAST: 4201 return bond_xmit_broadcast(skb, dev); 4202 case BOND_MODE_8023AD: 4203 return bond_3ad_xmit_xor(skb, dev); 4204 case BOND_MODE_ALB: 4205 case BOND_MODE_TLB: 4206 return bond_alb_xmit(skb, dev); 4207 default: 4208 /* Should never happen, mode already checked */ 4209 pr_err("%s: Error: Unknown bonding mode %d\n", 4210 dev->name, bond->params.mode); 4211 WARN_ON_ONCE(1); 4212 dev_kfree_skb(skb); 4213 return NETDEV_TX_OK; 4214 } 4215 } 4216 4217 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4218 { 4219 struct bonding *bond = netdev_priv(dev); 4220 netdev_tx_t ret = NETDEV_TX_OK; 4221 4222 /* 4223 * If we risk deadlock from transmitting this in the 4224 * netpoll path, tell netpoll to queue the frame for later tx 4225 */ 4226 if (is_netpoll_tx_blocked(dev)) 4227 return NETDEV_TX_BUSY; 4228 4229 read_lock(&bond->lock); 4230 4231 if (bond->slave_cnt) 4232 ret = __bond_start_xmit(skb, dev); 4233 else 4234 dev_kfree_skb(skb); 4235 4236 read_unlock(&bond->lock); 4237 4238 return ret; 4239 } 4240 4241 /* 4242 * set bond mode specific net device operations 4243 */ 4244 void bond_set_mode_ops(struct bonding *bond, int mode) 4245 { 4246 struct net_device *bond_dev = bond->dev; 4247 4248 switch (mode) { 4249 case BOND_MODE_ROUNDROBIN: 4250 break; 4251 case BOND_MODE_ACTIVEBACKUP: 4252 break; 4253 case BOND_MODE_XOR: 4254 bond_set_xmit_hash_policy(bond); 4255 break; 4256 case BOND_MODE_BROADCAST: 4257 break; 4258 case BOND_MODE_8023AD: 4259 bond_set_xmit_hash_policy(bond); 4260 break; 4261 case BOND_MODE_ALB: 4262 /* FALLTHRU */ 4263 case BOND_MODE_TLB: 4264 break; 4265 default: 4266 /* Should never happen, mode already checked */ 4267 pr_err("%s: Error: Unknown bonding mode %d\n", 4268 bond_dev->name, mode); 4269 break; 4270 } 4271 } 4272 4273 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 4274 struct ethtool_drvinfo *drvinfo) 4275 { 4276 strncpy(drvinfo->driver, DRV_NAME, 32); 4277 strncpy(drvinfo->version, DRV_VERSION, 32); 4278 snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION); 4279 } 4280 4281 static const struct ethtool_ops bond_ethtool_ops = { 4282 .get_drvinfo = bond_ethtool_get_drvinfo, 4283 .get_link = ethtool_op_get_link, 4284 }; 4285 4286 static const struct net_device_ops bond_netdev_ops = { 4287 .ndo_init = bond_init, 4288 .ndo_uninit = bond_uninit, 4289 .ndo_open = bond_open, 4290 .ndo_stop = bond_close, 4291 .ndo_start_xmit = bond_start_xmit, 4292 .ndo_select_queue = bond_select_queue, 4293 .ndo_get_stats64 = bond_get_stats, 4294 .ndo_do_ioctl = bond_do_ioctl, 4295 .ndo_change_rx_flags = bond_change_rx_flags, 4296 .ndo_set_rx_mode = bond_set_multicast_list, 4297 .ndo_change_mtu = bond_change_mtu, 4298 .ndo_set_mac_address = bond_set_mac_address, 4299 .ndo_neigh_setup = bond_neigh_setup, 4300 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 4301 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 4302 #ifdef CONFIG_NET_POLL_CONTROLLER 4303 .ndo_netpoll_setup = bond_netpoll_setup, 4304 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 4305 .ndo_poll_controller = bond_poll_controller, 4306 #endif 4307 .ndo_add_slave = bond_enslave, 4308 .ndo_del_slave = bond_release, 4309 .ndo_fix_features = bond_fix_features, 4310 }; 4311 4312 static void bond_destructor(struct net_device *bond_dev) 4313 { 4314 struct bonding *bond = netdev_priv(bond_dev); 4315 if (bond->wq) 4316 destroy_workqueue(bond->wq); 4317 free_netdev(bond_dev); 4318 } 4319 4320 static void bond_setup(struct net_device *bond_dev) 4321 { 4322 struct bonding *bond = netdev_priv(bond_dev); 4323 4324 /* initialize rwlocks */ 4325 rwlock_init(&bond->lock); 4326 rwlock_init(&bond->curr_slave_lock); 4327 4328 bond->params = bonding_defaults; 4329 4330 /* Initialize pointers */ 4331 bond->dev = bond_dev; 4332 INIT_LIST_HEAD(&bond->vlan_list); 4333 4334 /* Initialize the device entry points */ 4335 ether_setup(bond_dev); 4336 bond_dev->netdev_ops = &bond_netdev_ops; 4337 bond_dev->ethtool_ops = &bond_ethtool_ops; 4338 bond_set_mode_ops(bond, bond->params.mode); 4339 4340 bond_dev->destructor = bond_destructor; 4341 4342 /* Initialize the device options */ 4343 bond_dev->tx_queue_len = 0; 4344 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST; 4345 bond_dev->priv_flags |= IFF_BONDING; 4346 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 4347 4348 /* At first, we block adding VLANs. That's the only way to 4349 * prevent problems that occur when adding VLANs over an 4350 * empty bond. The block will be removed once non-challenged 4351 * slaves are enslaved. 4352 */ 4353 bond_dev->features |= NETIF_F_VLAN_CHALLENGED; 4354 4355 /* don't acquire bond device's netif_tx_lock when 4356 * transmitting */ 4357 bond_dev->features |= NETIF_F_LLTX; 4358 4359 /* By default, we declare the bond to be fully 4360 * VLAN hardware accelerated capable. Special 4361 * care is taken in the various xmit functions 4362 * when there are slaves that are not hw accel 4363 * capable 4364 */ 4365 4366 bond_dev->hw_features = BOND_VLAN_FEATURES | 4367 NETIF_F_HW_VLAN_TX | 4368 NETIF_F_HW_VLAN_RX | 4369 NETIF_F_HW_VLAN_FILTER; 4370 4371 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM); 4372 bond_dev->features |= bond_dev->hw_features; 4373 } 4374 4375 static void bond_work_cancel_all(struct bonding *bond) 4376 { 4377 if (bond->params.miimon && delayed_work_pending(&bond->mii_work)) 4378 cancel_delayed_work_sync(&bond->mii_work); 4379 4380 if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work)) 4381 cancel_delayed_work_sync(&bond->arp_work); 4382 4383 if (bond->params.mode == BOND_MODE_ALB && 4384 delayed_work_pending(&bond->alb_work)) 4385 cancel_delayed_work_sync(&bond->alb_work); 4386 4387 if (bond->params.mode == BOND_MODE_8023AD && 4388 delayed_work_pending(&bond->ad_work)) 4389 cancel_delayed_work_sync(&bond->ad_work); 4390 4391 if (delayed_work_pending(&bond->mcast_work)) 4392 cancel_delayed_work_sync(&bond->mcast_work); 4393 } 4394 4395 /* 4396 * Destroy a bonding device. 4397 * Must be under rtnl_lock when this function is called. 4398 */ 4399 static void bond_uninit(struct net_device *bond_dev) 4400 { 4401 struct bonding *bond = netdev_priv(bond_dev); 4402 struct vlan_entry *vlan, *tmp; 4403 4404 bond_netpoll_cleanup(bond_dev); 4405 4406 /* Release the bonded slaves */ 4407 bond_release_all(bond_dev); 4408 4409 list_del(&bond->bond_list); 4410 4411 bond_work_cancel_all(bond); 4412 4413 bond_remove_proc_entry(bond); 4414 4415 bond_debug_unregister(bond); 4416 4417 __hw_addr_flush(&bond->mc_list); 4418 4419 list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) { 4420 list_del(&vlan->vlan_list); 4421 kfree(vlan); 4422 } 4423 } 4424 4425 /*------------------------- Module initialization ---------------------------*/ 4426 4427 /* 4428 * Convert string input module parms. Accept either the 4429 * number of the mode or its string name. A bit complicated because 4430 * some mode names are substrings of other names, and calls from sysfs 4431 * may have whitespace in the name (trailing newlines, for example). 4432 */ 4433 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl) 4434 { 4435 int modeint = -1, i, rv; 4436 char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, }; 4437 4438 for (p = (char *)buf; *p; p++) 4439 if (!(isdigit(*p) || isspace(*p))) 4440 break; 4441 4442 if (*p) 4443 rv = sscanf(buf, "%20s", modestr); 4444 else 4445 rv = sscanf(buf, "%d", &modeint); 4446 4447 if (!rv) 4448 return -1; 4449 4450 for (i = 0; tbl[i].modename; i++) { 4451 if (modeint == tbl[i].mode) 4452 return tbl[i].mode; 4453 if (strcmp(modestr, tbl[i].modename) == 0) 4454 return tbl[i].mode; 4455 } 4456 4457 return -1; 4458 } 4459 4460 static int bond_check_params(struct bond_params *params) 4461 { 4462 int arp_validate_value, fail_over_mac_value, primary_reselect_value; 4463 4464 /* 4465 * Convert string parameters. 4466 */ 4467 if (mode) { 4468 bond_mode = bond_parse_parm(mode, bond_mode_tbl); 4469 if (bond_mode == -1) { 4470 pr_err("Error: Invalid bonding mode \"%s\"\n", 4471 mode == NULL ? "NULL" : mode); 4472 return -EINVAL; 4473 } 4474 } 4475 4476 if (xmit_hash_policy) { 4477 if ((bond_mode != BOND_MODE_XOR) && 4478 (bond_mode != BOND_MODE_8023AD)) { 4479 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 4480 bond_mode_name(bond_mode)); 4481 } else { 4482 xmit_hashtype = bond_parse_parm(xmit_hash_policy, 4483 xmit_hashtype_tbl); 4484 if (xmit_hashtype == -1) { 4485 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 4486 xmit_hash_policy == NULL ? "NULL" : 4487 xmit_hash_policy); 4488 return -EINVAL; 4489 } 4490 } 4491 } 4492 4493 if (lacp_rate) { 4494 if (bond_mode != BOND_MODE_8023AD) { 4495 pr_info("lacp_rate param is irrelevant in mode %s\n", 4496 bond_mode_name(bond_mode)); 4497 } else { 4498 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl); 4499 if (lacp_fast == -1) { 4500 pr_err("Error: Invalid lacp rate \"%s\"\n", 4501 lacp_rate == NULL ? "NULL" : lacp_rate); 4502 return -EINVAL; 4503 } 4504 } 4505 } 4506 4507 if (ad_select) { 4508 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl); 4509 if (params->ad_select == -1) { 4510 pr_err("Error: Invalid ad_select \"%s\"\n", 4511 ad_select == NULL ? "NULL" : ad_select); 4512 return -EINVAL; 4513 } 4514 4515 if (bond_mode != BOND_MODE_8023AD) { 4516 pr_warning("ad_select param only affects 802.3ad mode\n"); 4517 } 4518 } else { 4519 params->ad_select = BOND_AD_STABLE; 4520 } 4521 4522 if (max_bonds < 0) { 4523 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 4524 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 4525 max_bonds = BOND_DEFAULT_MAX_BONDS; 4526 } 4527 4528 if (miimon < 0) { 4529 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n", 4530 miimon, INT_MAX, BOND_LINK_MON_INTERV); 4531 miimon = BOND_LINK_MON_INTERV; 4532 } 4533 4534 if (updelay < 0) { 4535 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4536 updelay, INT_MAX); 4537 updelay = 0; 4538 } 4539 4540 if (downdelay < 0) { 4541 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4542 downdelay, INT_MAX); 4543 downdelay = 0; 4544 } 4545 4546 if ((use_carrier != 0) && (use_carrier != 1)) { 4547 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 4548 use_carrier); 4549 use_carrier = 1; 4550 } 4551 4552 if (num_peer_notif < 0 || num_peer_notif > 255) { 4553 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 4554 num_peer_notif); 4555 num_peer_notif = 1; 4556 } 4557 4558 /* reset values for 802.3ad */ 4559 if (bond_mode == BOND_MODE_8023AD) { 4560 if (!miimon) { 4561 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"); 4562 pr_warning("Forcing miimon to 100msec\n"); 4563 miimon = 100; 4564 } 4565 } 4566 4567 if (tx_queues < 1 || tx_queues > 255) { 4568 pr_warning("Warning: tx_queues (%d) should be between " 4569 "1 and 255, resetting to %d\n", 4570 tx_queues, BOND_DEFAULT_TX_QUEUES); 4571 tx_queues = BOND_DEFAULT_TX_QUEUES; 4572 } 4573 4574 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 4575 pr_warning("Warning: all_slaves_active module parameter (%d), " 4576 "not of valid value (0/1), so it was set to " 4577 "0\n", all_slaves_active); 4578 all_slaves_active = 0; 4579 } 4580 4581 if (resend_igmp < 0 || resend_igmp > 255) { 4582 pr_warning("Warning: resend_igmp (%d) should be between " 4583 "0 and 255, resetting to %d\n", 4584 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 4585 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 4586 } 4587 4588 /* reset values for TLB/ALB */ 4589 if ((bond_mode == BOND_MODE_TLB) || 4590 (bond_mode == BOND_MODE_ALB)) { 4591 if (!miimon) { 4592 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"); 4593 pr_warning("Forcing miimon to 100msec\n"); 4594 miimon = 100; 4595 } 4596 } 4597 4598 if (bond_mode == BOND_MODE_ALB) { 4599 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", 4600 updelay); 4601 } 4602 4603 if (!miimon) { 4604 if (updelay || downdelay) { 4605 /* just warn the user the up/down delay will have 4606 * no effect since miimon is zero... 4607 */ 4608 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", 4609 updelay, downdelay); 4610 } 4611 } else { 4612 /* don't allow arp monitoring */ 4613 if (arp_interval) { 4614 pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 4615 miimon, arp_interval); 4616 arp_interval = 0; 4617 } 4618 4619 if ((updelay % miimon) != 0) { 4620 pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 4621 updelay, miimon, 4622 (updelay / miimon) * miimon); 4623 } 4624 4625 updelay /= miimon; 4626 4627 if ((downdelay % miimon) != 0) { 4628 pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 4629 downdelay, miimon, 4630 (downdelay / miimon) * miimon); 4631 } 4632 4633 downdelay /= miimon; 4634 } 4635 4636 if (arp_interval < 0) { 4637 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n", 4638 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV); 4639 arp_interval = BOND_LINK_ARP_INTERV; 4640 } 4641 4642 for (arp_ip_count = 0; 4643 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count]; 4644 arp_ip_count++) { 4645 /* not complete check, but should be good enough to 4646 catch mistakes */ 4647 if (!isdigit(arp_ip_target[arp_ip_count][0])) { 4648 pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 4649 arp_ip_target[arp_ip_count]); 4650 arp_interval = 0; 4651 } else { 4652 __be32 ip = in_aton(arp_ip_target[arp_ip_count]); 4653 arp_target[arp_ip_count] = ip; 4654 } 4655 } 4656 4657 if (arp_interval && !arp_ip_count) { 4658 /* don't allow arping if no arp_ip_target given... */ 4659 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 4660 arp_interval); 4661 arp_interval = 0; 4662 } 4663 4664 if (arp_validate) { 4665 if (bond_mode != BOND_MODE_ACTIVEBACKUP) { 4666 pr_err("arp_validate only supported in active-backup mode\n"); 4667 return -EINVAL; 4668 } 4669 if (!arp_interval) { 4670 pr_err("arp_validate requires arp_interval\n"); 4671 return -EINVAL; 4672 } 4673 4674 arp_validate_value = bond_parse_parm(arp_validate, 4675 arp_validate_tbl); 4676 if (arp_validate_value == -1) { 4677 pr_err("Error: invalid arp_validate \"%s\"\n", 4678 arp_validate == NULL ? "NULL" : arp_validate); 4679 return -EINVAL; 4680 } 4681 } else 4682 arp_validate_value = 0; 4683 4684 if (miimon) { 4685 pr_info("MII link monitoring set to %d ms\n", miimon); 4686 } else if (arp_interval) { 4687 int i; 4688 4689 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 4690 arp_interval, 4691 arp_validate_tbl[arp_validate_value].modename, 4692 arp_ip_count); 4693 4694 for (i = 0; i < arp_ip_count; i++) 4695 pr_info(" %s", arp_ip_target[i]); 4696 4697 pr_info("\n"); 4698 4699 } else if (max_bonds) { 4700 /* miimon and arp_interval not set, we need one so things 4701 * work as expected, see bonding.txt for details 4702 */ 4703 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"); 4704 } 4705 4706 if (primary && !USES_PRIMARY(bond_mode)) { 4707 /* currently, using a primary only makes sense 4708 * in active backup, TLB or ALB modes 4709 */ 4710 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n", 4711 primary, bond_mode_name(bond_mode)); 4712 primary = NULL; 4713 } 4714 4715 if (primary && primary_reselect) { 4716 primary_reselect_value = bond_parse_parm(primary_reselect, 4717 pri_reselect_tbl); 4718 if (primary_reselect_value == -1) { 4719 pr_err("Error: Invalid primary_reselect \"%s\"\n", 4720 primary_reselect == 4721 NULL ? "NULL" : primary_reselect); 4722 return -EINVAL; 4723 } 4724 } else { 4725 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 4726 } 4727 4728 if (fail_over_mac) { 4729 fail_over_mac_value = bond_parse_parm(fail_over_mac, 4730 fail_over_mac_tbl); 4731 if (fail_over_mac_value == -1) { 4732 pr_err("Error: invalid fail_over_mac \"%s\"\n", 4733 arp_validate == NULL ? "NULL" : arp_validate); 4734 return -EINVAL; 4735 } 4736 4737 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 4738 pr_warning("Warning: fail_over_mac only affects active-backup mode.\n"); 4739 } else { 4740 fail_over_mac_value = BOND_FOM_NONE; 4741 } 4742 4743 /* fill params struct with the proper values */ 4744 params->mode = bond_mode; 4745 params->xmit_policy = xmit_hashtype; 4746 params->miimon = miimon; 4747 params->num_peer_notif = num_peer_notif; 4748 params->arp_interval = arp_interval; 4749 params->arp_validate = arp_validate_value; 4750 params->updelay = updelay; 4751 params->downdelay = downdelay; 4752 params->use_carrier = use_carrier; 4753 params->lacp_fast = lacp_fast; 4754 params->primary[0] = 0; 4755 params->primary_reselect = primary_reselect_value; 4756 params->fail_over_mac = fail_over_mac_value; 4757 params->tx_queues = tx_queues; 4758 params->all_slaves_active = all_slaves_active; 4759 params->resend_igmp = resend_igmp; 4760 params->min_links = min_links; 4761 4762 if (primary) { 4763 strncpy(params->primary, primary, IFNAMSIZ); 4764 params->primary[IFNAMSIZ - 1] = 0; 4765 } 4766 4767 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 4768 4769 return 0; 4770 } 4771 4772 static struct lock_class_key bonding_netdev_xmit_lock_key; 4773 static struct lock_class_key bonding_netdev_addr_lock_key; 4774 4775 static void bond_set_lockdep_class_one(struct net_device *dev, 4776 struct netdev_queue *txq, 4777 void *_unused) 4778 { 4779 lockdep_set_class(&txq->_xmit_lock, 4780 &bonding_netdev_xmit_lock_key); 4781 } 4782 4783 static void bond_set_lockdep_class(struct net_device *dev) 4784 { 4785 lockdep_set_class(&dev->addr_list_lock, 4786 &bonding_netdev_addr_lock_key); 4787 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL); 4788 } 4789 4790 /* 4791 * Called from registration process 4792 */ 4793 static int bond_init(struct net_device *bond_dev) 4794 { 4795 struct bonding *bond = netdev_priv(bond_dev); 4796 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 4797 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); 4798 4799 pr_debug("Begin bond_init for %s\n", bond_dev->name); 4800 4801 /* 4802 * Initialize locks that may be required during 4803 * en/deslave operations. All of the bond_open work 4804 * (of which this is part) should really be moved to 4805 * a phase prior to dev_open 4806 */ 4807 spin_lock_init(&(bond_info->tx_hashtbl_lock)); 4808 spin_lock_init(&(bond_info->rx_hashtbl_lock)); 4809 4810 bond->wq = create_singlethread_workqueue(bond_dev->name); 4811 if (!bond->wq) 4812 return -ENOMEM; 4813 4814 bond_set_lockdep_class(bond_dev); 4815 4816 bond_create_proc_entry(bond); 4817 list_add_tail(&bond->bond_list, &bn->dev_list); 4818 4819 bond_prepare_sysfs_group(bond); 4820 4821 bond_debug_register(bond); 4822 4823 __hw_addr_init(&bond->mc_list); 4824 return 0; 4825 } 4826 4827 static int bond_validate(struct nlattr *tb[], struct nlattr *data[]) 4828 { 4829 if (tb[IFLA_ADDRESS]) { 4830 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 4831 return -EINVAL; 4832 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 4833 return -EADDRNOTAVAIL; 4834 } 4835 return 0; 4836 } 4837 4838 static int bond_get_tx_queues(struct net *net, struct nlattr *tb[]) 4839 { 4840 return tx_queues; 4841 } 4842 4843 static struct rtnl_link_ops bond_link_ops __read_mostly = { 4844 .kind = "bond", 4845 .priv_size = sizeof(struct bonding), 4846 .setup = bond_setup, 4847 .validate = bond_validate, 4848 .get_tx_queues = bond_get_tx_queues, 4849 }; 4850 4851 /* Create a new bond based on the specified name and bonding parameters. 4852 * If name is NULL, obtain a suitable "bond%d" name for us. 4853 * Caller must NOT hold rtnl_lock; we need to release it here before we 4854 * set up our sysfs entries. 4855 */ 4856 int bond_create(struct net *net, const char *name) 4857 { 4858 struct net_device *bond_dev; 4859 int res; 4860 4861 rtnl_lock(); 4862 4863 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 4864 name ? name : "bond%d", 4865 bond_setup, tx_queues); 4866 if (!bond_dev) { 4867 pr_err("%s: eek! can't alloc netdev!\n", name); 4868 rtnl_unlock(); 4869 return -ENOMEM; 4870 } 4871 4872 dev_net_set(bond_dev, net); 4873 bond_dev->rtnl_link_ops = &bond_link_ops; 4874 4875 res = register_netdevice(bond_dev); 4876 4877 netif_carrier_off(bond_dev); 4878 4879 rtnl_unlock(); 4880 if (res < 0) 4881 bond_destructor(bond_dev); 4882 return res; 4883 } 4884 4885 static int __net_init bond_net_init(struct net *net) 4886 { 4887 struct bond_net *bn = net_generic(net, bond_net_id); 4888 4889 bn->net = net; 4890 INIT_LIST_HEAD(&bn->dev_list); 4891 4892 bond_create_proc_dir(bn); 4893 bond_create_sysfs(bn); 4894 4895 return 0; 4896 } 4897 4898 static void __net_exit bond_net_exit(struct net *net) 4899 { 4900 struct bond_net *bn = net_generic(net, bond_net_id); 4901 4902 bond_destroy_sysfs(bn); 4903 bond_destroy_proc_dir(bn); 4904 } 4905 4906 static struct pernet_operations bond_net_ops = { 4907 .init = bond_net_init, 4908 .exit = bond_net_exit, 4909 .id = &bond_net_id, 4910 .size = sizeof(struct bond_net), 4911 }; 4912 4913 static int __init bonding_init(void) 4914 { 4915 int i; 4916 int res; 4917 4918 pr_info("%s", bond_version); 4919 4920 res = bond_check_params(&bonding_defaults); 4921 if (res) 4922 goto out; 4923 4924 res = register_pernet_subsys(&bond_net_ops); 4925 if (res) 4926 goto out; 4927 4928 res = rtnl_link_register(&bond_link_ops); 4929 if (res) 4930 goto err_link; 4931 4932 bond_create_debugfs(); 4933 4934 for (i = 0; i < max_bonds; i++) { 4935 res = bond_create(&init_net, NULL); 4936 if (res) 4937 goto err; 4938 } 4939 4940 register_netdevice_notifier(&bond_netdev_notifier); 4941 out: 4942 return res; 4943 err: 4944 rtnl_link_unregister(&bond_link_ops); 4945 err_link: 4946 unregister_pernet_subsys(&bond_net_ops); 4947 goto out; 4948 4949 } 4950 4951 static void __exit bonding_exit(void) 4952 { 4953 unregister_netdevice_notifier(&bond_netdev_notifier); 4954 4955 bond_destroy_debugfs(); 4956 4957 rtnl_link_unregister(&bond_link_ops); 4958 unregister_pernet_subsys(&bond_net_ops); 4959 4960 #ifdef CONFIG_NET_POLL_CONTROLLER 4961 /* 4962 * Make sure we don't have an imbalance on our netpoll blocking 4963 */ 4964 WARN_ON(atomic_read(&netpoll_block_tx)); 4965 #endif 4966 } 4967 4968 module_init(bonding_init); 4969 module_exit(bonding_exit); 4970 MODULE_LICENSE("GPL"); 4971 MODULE_VERSION(DRV_VERSION); 4972 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION); 4973 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 4974 MODULE_ALIAS_RTNL_LINK("bond"); 4975