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 <net/pkt_sched.h> 80 #include "bonding.h" 81 #include "bond_3ad.h" 82 #include "bond_alb.h" 83 84 /*---------------------------- Module parameters ----------------------------*/ 85 86 /* monitor all links that often (in milliseconds). <=0 disables monitoring */ 87 #define BOND_LINK_MON_INTERV 0 88 #define BOND_LINK_ARP_INTERV 0 89 90 static int max_bonds = BOND_DEFAULT_MAX_BONDS; 91 static int tx_queues = BOND_DEFAULT_TX_QUEUES; 92 static int num_peer_notif = 1; 93 static int miimon = BOND_LINK_MON_INTERV; 94 static int updelay; 95 static int downdelay; 96 static int use_carrier = 1; 97 static char *mode; 98 static char *primary; 99 static char *primary_reselect; 100 static char *lacp_rate; 101 static int min_links; 102 static char *ad_select; 103 static char *xmit_hash_policy; 104 static int arp_interval = BOND_LINK_ARP_INTERV; 105 static char *arp_ip_target[BOND_MAX_ARP_TARGETS]; 106 static char *arp_validate; 107 static char *fail_over_mac; 108 static int all_slaves_active = 0; 109 static struct bond_params bonding_defaults; 110 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP; 111 112 module_param(max_bonds, int, 0); 113 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices"); 114 module_param(tx_queues, int, 0); 115 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)"); 116 module_param_named(num_grat_arp, num_peer_notif, int, 0644); 117 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on " 118 "failover event (alias of num_unsol_na)"); 119 module_param_named(num_unsol_na, num_peer_notif, int, 0644); 120 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on " 121 "failover event (alias of num_grat_arp)"); 122 module_param(miimon, int, 0); 123 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds"); 124 module_param(updelay, int, 0); 125 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds"); 126 module_param(downdelay, int, 0); 127 MODULE_PARM_DESC(downdelay, "Delay before considering link down, " 128 "in milliseconds"); 129 module_param(use_carrier, int, 0); 130 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; " 131 "0 for off, 1 for on (default)"); 132 module_param(mode, charp, 0); 133 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, " 134 "1 for active-backup, 2 for balance-xor, " 135 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, " 136 "6 for balance-alb"); 137 module_param(primary, charp, 0); 138 MODULE_PARM_DESC(primary, "Primary network device to use"); 139 module_param(primary_reselect, charp, 0); 140 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave " 141 "once it comes up; " 142 "0 for always (default), " 143 "1 for only if speed of primary is " 144 "better, " 145 "2 for only on active slave " 146 "failure"); 147 module_param(lacp_rate, charp, 0); 148 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; " 149 "0 for slow, 1 for fast"); 150 module_param(ad_select, charp, 0); 151 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; " 152 "0 for stable (default), 1 for bandwidth, " 153 "2 for count"); 154 module_param(min_links, int, 0); 155 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier"); 156 157 module_param(xmit_hash_policy, charp, 0); 158 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; " 159 "0 for layer 2 (default), 1 for layer 3+4, " 160 "2 for layer 2+3"); 161 module_param(arp_interval, int, 0); 162 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds"); 163 module_param_array(arp_ip_target, charp, NULL, 0); 164 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form"); 165 module_param(arp_validate, charp, 0); 166 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; " 167 "0 for none (default), 1 for active, " 168 "2 for backup, 3 for all"); 169 module_param(fail_over_mac, charp, 0); 170 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to " 171 "the same MAC; 0 for none (default), " 172 "1 for active, 2 for follow"); 173 module_param(all_slaves_active, int, 0); 174 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface" 175 "by setting active flag for all slaves; " 176 "0 for never (default), 1 for always."); 177 module_param(resend_igmp, int, 0); 178 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on " 179 "link failure"); 180 181 /*----------------------------- Global variables ----------------------------*/ 182 183 #ifdef CONFIG_NET_POLL_CONTROLLER 184 atomic_t netpoll_block_tx = ATOMIC_INIT(0); 185 #endif 186 187 int bond_net_id __read_mostly; 188 189 static __be32 arp_target[BOND_MAX_ARP_TARGETS]; 190 static int arp_ip_count; 191 static int bond_mode = BOND_MODE_ROUNDROBIN; 192 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2; 193 static int lacp_fast; 194 195 const struct bond_parm_tbl bond_lacp_tbl[] = { 196 { "slow", AD_LACP_SLOW}, 197 { "fast", AD_LACP_FAST}, 198 { NULL, -1}, 199 }; 200 201 const struct bond_parm_tbl bond_mode_tbl[] = { 202 { "balance-rr", BOND_MODE_ROUNDROBIN}, 203 { "active-backup", BOND_MODE_ACTIVEBACKUP}, 204 { "balance-xor", BOND_MODE_XOR}, 205 { "broadcast", BOND_MODE_BROADCAST}, 206 { "802.3ad", BOND_MODE_8023AD}, 207 { "balance-tlb", BOND_MODE_TLB}, 208 { "balance-alb", BOND_MODE_ALB}, 209 { NULL, -1}, 210 }; 211 212 const struct bond_parm_tbl xmit_hashtype_tbl[] = { 213 { "layer2", BOND_XMIT_POLICY_LAYER2}, 214 { "layer3+4", BOND_XMIT_POLICY_LAYER34}, 215 { "layer2+3", BOND_XMIT_POLICY_LAYER23}, 216 { NULL, -1}, 217 }; 218 219 const struct bond_parm_tbl arp_validate_tbl[] = { 220 { "none", BOND_ARP_VALIDATE_NONE}, 221 { "active", BOND_ARP_VALIDATE_ACTIVE}, 222 { "backup", BOND_ARP_VALIDATE_BACKUP}, 223 { "all", BOND_ARP_VALIDATE_ALL}, 224 { NULL, -1}, 225 }; 226 227 const struct bond_parm_tbl fail_over_mac_tbl[] = { 228 { "none", BOND_FOM_NONE}, 229 { "active", BOND_FOM_ACTIVE}, 230 { "follow", BOND_FOM_FOLLOW}, 231 { NULL, -1}, 232 }; 233 234 const struct bond_parm_tbl pri_reselect_tbl[] = { 235 { "always", BOND_PRI_RESELECT_ALWAYS}, 236 { "better", BOND_PRI_RESELECT_BETTER}, 237 { "failure", BOND_PRI_RESELECT_FAILURE}, 238 { NULL, -1}, 239 }; 240 241 struct bond_parm_tbl ad_select_tbl[] = { 242 { "stable", BOND_AD_STABLE}, 243 { "bandwidth", BOND_AD_BANDWIDTH}, 244 { "count", BOND_AD_COUNT}, 245 { NULL, -1}, 246 }; 247 248 /*-------------------------- Forward declarations ---------------------------*/ 249 250 static int bond_init(struct net_device *bond_dev); 251 static void bond_uninit(struct net_device *bond_dev); 252 253 /*---------------------------- General routines -----------------------------*/ 254 255 const char *bond_mode_name(int mode) 256 { 257 static const char *names[] = { 258 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)", 259 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)", 260 [BOND_MODE_XOR] = "load balancing (xor)", 261 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)", 262 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation", 263 [BOND_MODE_TLB] = "transmit load balancing", 264 [BOND_MODE_ALB] = "adaptive load balancing", 265 }; 266 267 if (mode < 0 || mode > BOND_MODE_ALB) 268 return "unknown"; 269 270 return names[mode]; 271 } 272 273 /*---------------------------------- VLAN -----------------------------------*/ 274 275 /** 276 * bond_add_vlan - add a new vlan id on bond 277 * @bond: bond that got the notification 278 * @vlan_id: the vlan id to add 279 * 280 * Returns -ENOMEM if allocation failed. 281 */ 282 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id) 283 { 284 struct vlan_entry *vlan; 285 286 pr_debug("bond: %s, vlan id %d\n", 287 (bond ? bond->dev->name : "None"), vlan_id); 288 289 vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL); 290 if (!vlan) 291 return -ENOMEM; 292 293 INIT_LIST_HEAD(&vlan->vlan_list); 294 vlan->vlan_id = vlan_id; 295 296 write_lock_bh(&bond->lock); 297 298 list_add_tail(&vlan->vlan_list, &bond->vlan_list); 299 300 write_unlock_bh(&bond->lock); 301 302 pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name); 303 304 return 0; 305 } 306 307 /** 308 * bond_del_vlan - delete a vlan id from bond 309 * @bond: bond that got the notification 310 * @vlan_id: the vlan id to delete 311 * 312 * returns -ENODEV if @vlan_id was not found in @bond. 313 */ 314 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id) 315 { 316 struct vlan_entry *vlan; 317 int res = -ENODEV; 318 319 pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id); 320 321 block_netpoll_tx(); 322 write_lock_bh(&bond->lock); 323 324 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 325 if (vlan->vlan_id == vlan_id) { 326 list_del(&vlan->vlan_list); 327 328 if (bond_is_lb(bond)) 329 bond_alb_clear_vlan(bond, vlan_id); 330 331 pr_debug("removed VLAN ID %d from bond %s\n", 332 vlan_id, bond->dev->name); 333 334 kfree(vlan); 335 336 res = 0; 337 goto out; 338 } 339 } 340 341 pr_debug("couldn't find VLAN ID %d in bond %s\n", 342 vlan_id, bond->dev->name); 343 344 out: 345 write_unlock_bh(&bond->lock); 346 unblock_netpoll_tx(); 347 return res; 348 } 349 350 /** 351 * bond_next_vlan - safely skip to the next item in the vlans list. 352 * @bond: the bond we're working on 353 * @curr: item we're advancing from 354 * 355 * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL, 356 * or @curr->next otherwise (even if it is @curr itself again). 357 * 358 * Caller must hold bond->lock 359 */ 360 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr) 361 { 362 struct vlan_entry *next, *last; 363 364 if (list_empty(&bond->vlan_list)) 365 return NULL; 366 367 if (!curr) { 368 next = list_entry(bond->vlan_list.next, 369 struct vlan_entry, vlan_list); 370 } else { 371 last = list_entry(bond->vlan_list.prev, 372 struct vlan_entry, vlan_list); 373 if (last == curr) { 374 next = list_entry(bond->vlan_list.next, 375 struct vlan_entry, vlan_list); 376 } else { 377 next = list_entry(curr->vlan_list.next, 378 struct vlan_entry, vlan_list); 379 } 380 } 381 382 return next; 383 } 384 385 /** 386 * bond_dev_queue_xmit - Prepare skb for xmit. 387 * 388 * @bond: bond device that got this skb for tx. 389 * @skb: hw accel VLAN tagged skb to transmit 390 * @slave_dev: slave that is supposed to xmit this skbuff 391 */ 392 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, 393 struct net_device *slave_dev) 394 { 395 skb->dev = slave_dev; 396 397 BUILD_BUG_ON(sizeof(skb->queue_mapping) != 398 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping)); 399 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping; 400 401 if (unlikely(netpoll_tx_running(slave_dev))) 402 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb); 403 else 404 dev_queue_xmit(skb); 405 406 return 0; 407 } 408 409 /* 410 * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid, 411 * We don't protect the slave list iteration with a lock because: 412 * a. This operation is performed in IOCTL context, 413 * b. The operation is protected by the RTNL semaphore in the 8021q code, 414 * c. Holding a lock with BH disabled while directly calling a base driver 415 * entry point is generally a BAD idea. 416 * 417 * The design of synchronization/protection for this operation in the 8021q 418 * module is good for one or more VLAN devices over a single physical device 419 * and cannot be extended for a teaming solution like bonding, so there is a 420 * potential race condition here where a net device from the vlan group might 421 * be referenced (either by a base driver or the 8021q code) while it is being 422 * removed from the system. However, it turns out we're not making matters 423 * worse, and if it works for regular VLAN usage it will work here too. 424 */ 425 426 /** 427 * bond_vlan_rx_add_vid - Propagates adding an id to slaves 428 * @bond_dev: bonding net device that got called 429 * @vid: vlan id being added 430 */ 431 static int bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid) 432 { 433 struct bonding *bond = netdev_priv(bond_dev); 434 struct slave *slave, *stop_at; 435 int i, res; 436 437 bond_for_each_slave(bond, slave, i) { 438 res = vlan_vid_add(slave->dev, vid); 439 if (res) 440 goto unwind; 441 } 442 443 res = bond_add_vlan(bond, vid); 444 if (res) { 445 pr_err("%s: Error: Failed to add vlan id %d\n", 446 bond_dev->name, vid); 447 return res; 448 } 449 450 return 0; 451 452 unwind: 453 /* unwind from head to the slave that failed */ 454 stop_at = slave; 455 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) 456 vlan_vid_del(slave->dev, vid); 457 458 return res; 459 } 460 461 /** 462 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves 463 * @bond_dev: bonding net device that got called 464 * @vid: vlan id being removed 465 */ 466 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid) 467 { 468 struct bonding *bond = netdev_priv(bond_dev); 469 struct slave *slave; 470 int i, res; 471 472 bond_for_each_slave(bond, slave, i) 473 vlan_vid_del(slave->dev, vid); 474 475 res = bond_del_vlan(bond, vid); 476 if (res) { 477 pr_err("%s: Error: Failed to remove vlan id %d\n", 478 bond_dev->name, vid); 479 return res; 480 } 481 482 return 0; 483 } 484 485 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev) 486 { 487 struct vlan_entry *vlan; 488 int res; 489 490 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 491 res = vlan_vid_add(slave_dev, vlan->vlan_id); 492 if (res) 493 pr_warning("%s: Failed to add vlan id %d to device %s\n", 494 bond->dev->name, vlan->vlan_id, 495 slave_dev->name); 496 } 497 } 498 499 static void bond_del_vlans_from_slave(struct bonding *bond, 500 struct net_device *slave_dev) 501 { 502 struct vlan_entry *vlan; 503 504 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 505 if (!vlan->vlan_id) 506 continue; 507 vlan_vid_del(slave_dev, vlan->vlan_id); 508 } 509 } 510 511 /*------------------------------- Link status -------------------------------*/ 512 513 /* 514 * Set the carrier state for the master according to the state of its 515 * slaves. If any slaves are up, the master is up. In 802.3ad mode, 516 * do special 802.3ad magic. 517 * 518 * Returns zero if carrier state does not change, nonzero if it does. 519 */ 520 static int bond_set_carrier(struct bonding *bond) 521 { 522 struct slave *slave; 523 int i; 524 525 if (bond->slave_cnt == 0) 526 goto down; 527 528 if (bond->params.mode == BOND_MODE_8023AD) 529 return bond_3ad_set_carrier(bond); 530 531 bond_for_each_slave(bond, slave, i) { 532 if (slave->link == BOND_LINK_UP) { 533 if (!netif_carrier_ok(bond->dev)) { 534 netif_carrier_on(bond->dev); 535 return 1; 536 } 537 return 0; 538 } 539 } 540 541 down: 542 if (netif_carrier_ok(bond->dev)) { 543 netif_carrier_off(bond->dev); 544 return 1; 545 } 546 return 0; 547 } 548 549 /* 550 * Get link speed and duplex from the slave's base driver 551 * using ethtool. If for some reason the call fails or the 552 * values are invalid, set speed and duplex to -1, 553 * and return. 554 */ 555 static void bond_update_speed_duplex(struct slave *slave) 556 { 557 struct net_device *slave_dev = slave->dev; 558 struct ethtool_cmd ecmd; 559 u32 slave_speed; 560 int res; 561 562 slave->speed = SPEED_UNKNOWN; 563 slave->duplex = DUPLEX_UNKNOWN; 564 565 res = __ethtool_get_settings(slave_dev, &ecmd); 566 if (res < 0) 567 return; 568 569 slave_speed = ethtool_cmd_speed(&ecmd); 570 if (slave_speed == 0 || slave_speed == ((__u32) -1)) 571 return; 572 573 switch (ecmd.duplex) { 574 case DUPLEX_FULL: 575 case DUPLEX_HALF: 576 break; 577 default: 578 return; 579 } 580 581 slave->speed = slave_speed; 582 slave->duplex = ecmd.duplex; 583 584 return; 585 } 586 587 /* 588 * if <dev> supports MII link status reporting, check its link status. 589 * 590 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), 591 * depending upon the setting of the use_carrier parameter. 592 * 593 * Return either BMSR_LSTATUS, meaning that the link is up (or we 594 * can't tell and just pretend it is), or 0, meaning that the link is 595 * down. 596 * 597 * If reporting is non-zero, instead of faking link up, return -1 if 598 * both ETHTOOL and MII ioctls fail (meaning the device does not 599 * support them). If use_carrier is set, return whatever it says. 600 * It'd be nice if there was a good way to tell if a driver supports 601 * netif_carrier, but there really isn't. 602 */ 603 static int bond_check_dev_link(struct bonding *bond, 604 struct net_device *slave_dev, int reporting) 605 { 606 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 607 int (*ioctl)(struct net_device *, struct ifreq *, int); 608 struct ifreq ifr; 609 struct mii_ioctl_data *mii; 610 611 if (!reporting && !netif_running(slave_dev)) 612 return 0; 613 614 if (bond->params.use_carrier) 615 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; 616 617 /* Try to get link status using Ethtool first. */ 618 if (slave_dev->ethtool_ops) { 619 if (slave_dev->ethtool_ops->get_link) { 620 u32 link; 621 622 link = slave_dev->ethtool_ops->get_link(slave_dev); 623 624 return link ? BMSR_LSTATUS : 0; 625 } 626 } 627 628 /* Ethtool can't be used, fallback to MII ioctls. */ 629 ioctl = slave_ops->ndo_do_ioctl; 630 if (ioctl) { 631 /* TODO: set pointer to correct ioctl on a per team member */ 632 /* bases to make this more efficient. that is, once */ 633 /* we determine the correct ioctl, we will always */ 634 /* call it and not the others for that team */ 635 /* member. */ 636 637 /* 638 * We cannot assume that SIOCGMIIPHY will also read a 639 * register; not all network drivers (e.g., e100) 640 * support that. 641 */ 642 643 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ 644 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ); 645 mii = if_mii(&ifr); 646 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) { 647 mii->reg_num = MII_BMSR; 648 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) 649 return mii->val_out & BMSR_LSTATUS; 650 } 651 } 652 653 /* 654 * If reporting, report that either there's no dev->do_ioctl, 655 * or both SIOCGMIIREG and get_link failed (meaning that we 656 * cannot report link status). If not reporting, pretend 657 * we're ok. 658 */ 659 return reporting ? -1 : BMSR_LSTATUS; 660 } 661 662 /*----------------------------- Multicast list ------------------------------*/ 663 664 /* 665 * Push the promiscuity flag down to appropriate slaves 666 */ 667 static int bond_set_promiscuity(struct bonding *bond, int inc) 668 { 669 int err = 0; 670 if (USES_PRIMARY(bond->params.mode)) { 671 /* write lock already acquired */ 672 if (bond->curr_active_slave) { 673 err = dev_set_promiscuity(bond->curr_active_slave->dev, 674 inc); 675 } 676 } else { 677 struct slave *slave; 678 int i; 679 bond_for_each_slave(bond, slave, i) { 680 err = dev_set_promiscuity(slave->dev, inc); 681 if (err) 682 return err; 683 } 684 } 685 return err; 686 } 687 688 /* 689 * Push the allmulti flag down to all slaves 690 */ 691 static int bond_set_allmulti(struct bonding *bond, int inc) 692 { 693 int err = 0; 694 if (USES_PRIMARY(bond->params.mode)) { 695 /* write lock already acquired */ 696 if (bond->curr_active_slave) { 697 err = dev_set_allmulti(bond->curr_active_slave->dev, 698 inc); 699 } 700 } else { 701 struct slave *slave; 702 int i; 703 bond_for_each_slave(bond, slave, i) { 704 err = dev_set_allmulti(slave->dev, inc); 705 if (err) 706 return err; 707 } 708 } 709 return err; 710 } 711 712 /* 713 * Add a Multicast address to slaves 714 * according to mode 715 */ 716 static void bond_mc_add(struct bonding *bond, void *addr) 717 { 718 if (USES_PRIMARY(bond->params.mode)) { 719 /* write lock already acquired */ 720 if (bond->curr_active_slave) 721 dev_mc_add(bond->curr_active_slave->dev, addr); 722 } else { 723 struct slave *slave; 724 int i; 725 726 bond_for_each_slave(bond, slave, i) 727 dev_mc_add(slave->dev, addr); 728 } 729 } 730 731 /* 732 * Remove a multicast address from slave 733 * according to mode 734 */ 735 static void bond_mc_del(struct bonding *bond, void *addr) 736 { 737 if (USES_PRIMARY(bond->params.mode)) { 738 /* write lock already acquired */ 739 if (bond->curr_active_slave) 740 dev_mc_del(bond->curr_active_slave->dev, addr); 741 } else { 742 struct slave *slave; 743 int i; 744 bond_for_each_slave(bond, slave, i) { 745 dev_mc_del(slave->dev, addr); 746 } 747 } 748 } 749 750 751 static void __bond_resend_igmp_join_requests(struct net_device *dev) 752 { 753 struct in_device *in_dev; 754 755 rcu_read_lock(); 756 in_dev = __in_dev_get_rcu(dev); 757 if (in_dev) 758 ip_mc_rejoin_groups(in_dev); 759 rcu_read_unlock(); 760 } 761 762 /* 763 * Retrieve the list of registered multicast addresses for the bonding 764 * device and retransmit an IGMP JOIN request to the current active 765 * slave. 766 */ 767 static void bond_resend_igmp_join_requests(struct bonding *bond) 768 { 769 struct net_device *bond_dev, *vlan_dev, *master_dev; 770 struct vlan_entry *vlan; 771 772 read_lock(&bond->lock); 773 774 bond_dev = bond->dev; 775 776 /* rejoin all groups on bond device */ 777 __bond_resend_igmp_join_requests(bond_dev); 778 779 /* 780 * if bond is enslaved to a bridge, 781 * then rejoin all groups on its master 782 */ 783 master_dev = bond_dev->master; 784 if (master_dev) 785 if ((master_dev->priv_flags & IFF_EBRIDGE) 786 && (bond_dev->priv_flags & IFF_BRIDGE_PORT)) 787 __bond_resend_igmp_join_requests(master_dev); 788 789 /* rejoin all groups on vlan devices */ 790 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 791 rcu_read_lock(); 792 vlan_dev = __vlan_find_dev_deep(bond_dev, 793 vlan->vlan_id); 794 rcu_read_unlock(); 795 if (vlan_dev) 796 __bond_resend_igmp_join_requests(vlan_dev); 797 } 798 799 if (--bond->igmp_retrans > 0) 800 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); 801 802 read_unlock(&bond->lock); 803 } 804 805 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work) 806 { 807 struct bonding *bond = container_of(work, struct bonding, 808 mcast_work.work); 809 bond_resend_igmp_join_requests(bond); 810 } 811 812 /* 813 * flush all members of flush->mc_list from device dev->mc_list 814 */ 815 static void bond_mc_list_flush(struct net_device *bond_dev, 816 struct net_device *slave_dev) 817 { 818 struct bonding *bond = netdev_priv(bond_dev); 819 struct netdev_hw_addr *ha; 820 821 netdev_for_each_mc_addr(ha, bond_dev) 822 dev_mc_del(slave_dev, ha->addr); 823 824 if (bond->params.mode == BOND_MODE_8023AD) { 825 /* del lacpdu mc addr from mc list */ 826 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 827 828 dev_mc_del(slave_dev, lacpdu_multicast); 829 } 830 } 831 832 /*--------------------------- Active slave change ---------------------------*/ 833 834 /* 835 * Update the mc list and multicast-related flags for the new and 836 * old active slaves (if any) according to the multicast mode, and 837 * promiscuous flags unconditionally. 838 */ 839 static void bond_mc_swap(struct bonding *bond, struct slave *new_active, 840 struct slave *old_active) 841 { 842 struct netdev_hw_addr *ha; 843 844 if (!USES_PRIMARY(bond->params.mode)) 845 /* nothing to do - mc list is already up-to-date on 846 * all slaves 847 */ 848 return; 849 850 if (old_active) { 851 if (bond->dev->flags & IFF_PROMISC) 852 dev_set_promiscuity(old_active->dev, -1); 853 854 if (bond->dev->flags & IFF_ALLMULTI) 855 dev_set_allmulti(old_active->dev, -1); 856 857 netdev_for_each_mc_addr(ha, bond->dev) 858 dev_mc_del(old_active->dev, ha->addr); 859 } 860 861 if (new_active) { 862 /* FIXME: Signal errors upstream. */ 863 if (bond->dev->flags & IFF_PROMISC) 864 dev_set_promiscuity(new_active->dev, 1); 865 866 if (bond->dev->flags & IFF_ALLMULTI) 867 dev_set_allmulti(new_active->dev, 1); 868 869 netdev_for_each_mc_addr(ha, bond->dev) 870 dev_mc_add(new_active->dev, ha->addr); 871 } 872 } 873 874 /* 875 * bond_do_fail_over_mac 876 * 877 * Perform special MAC address swapping for fail_over_mac settings 878 * 879 * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh. 880 */ 881 static void bond_do_fail_over_mac(struct bonding *bond, 882 struct slave *new_active, 883 struct slave *old_active) 884 __releases(&bond->curr_slave_lock) 885 __releases(&bond->lock) 886 __acquires(&bond->lock) 887 __acquires(&bond->curr_slave_lock) 888 { 889 u8 tmp_mac[ETH_ALEN]; 890 struct sockaddr saddr; 891 int rv; 892 893 switch (bond->params.fail_over_mac) { 894 case BOND_FOM_ACTIVE: 895 if (new_active) { 896 memcpy(bond->dev->dev_addr, new_active->dev->dev_addr, 897 new_active->dev->addr_len); 898 write_unlock_bh(&bond->curr_slave_lock); 899 read_unlock(&bond->lock); 900 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 901 read_lock(&bond->lock); 902 write_lock_bh(&bond->curr_slave_lock); 903 } 904 break; 905 case BOND_FOM_FOLLOW: 906 /* 907 * if new_active && old_active, swap them 908 * if just old_active, do nothing (going to no active slave) 909 * if just new_active, set new_active to bond's MAC 910 */ 911 if (!new_active) 912 return; 913 914 write_unlock_bh(&bond->curr_slave_lock); 915 read_unlock(&bond->lock); 916 917 if (old_active) { 918 memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN); 919 memcpy(saddr.sa_data, old_active->dev->dev_addr, 920 ETH_ALEN); 921 saddr.sa_family = new_active->dev->type; 922 } else { 923 memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN); 924 saddr.sa_family = bond->dev->type; 925 } 926 927 rv = dev_set_mac_address(new_active->dev, &saddr); 928 if (rv) { 929 pr_err("%s: Error %d setting MAC of slave %s\n", 930 bond->dev->name, -rv, new_active->dev->name); 931 goto out; 932 } 933 934 if (!old_active) 935 goto out; 936 937 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN); 938 saddr.sa_family = old_active->dev->type; 939 940 rv = dev_set_mac_address(old_active->dev, &saddr); 941 if (rv) 942 pr_err("%s: Error %d setting MAC of slave %s\n", 943 bond->dev->name, -rv, new_active->dev->name); 944 out: 945 read_lock(&bond->lock); 946 write_lock_bh(&bond->curr_slave_lock); 947 break; 948 default: 949 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n", 950 bond->dev->name, bond->params.fail_over_mac); 951 break; 952 } 953 954 } 955 956 static bool bond_should_change_active(struct bonding *bond) 957 { 958 struct slave *prim = bond->primary_slave; 959 struct slave *curr = bond->curr_active_slave; 960 961 if (!prim || !curr || curr->link != BOND_LINK_UP) 962 return true; 963 if (bond->force_primary) { 964 bond->force_primary = false; 965 return true; 966 } 967 if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER && 968 (prim->speed < curr->speed || 969 (prim->speed == curr->speed && prim->duplex <= curr->duplex))) 970 return false; 971 if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE) 972 return false; 973 return true; 974 } 975 976 /** 977 * find_best_interface - select the best available slave to be the active one 978 * @bond: our bonding struct 979 * 980 * Warning: Caller must hold curr_slave_lock for writing. 981 */ 982 static struct slave *bond_find_best_slave(struct bonding *bond) 983 { 984 struct slave *new_active, *old_active; 985 struct slave *bestslave = NULL; 986 int mintime = bond->params.updelay; 987 int i; 988 989 new_active = bond->curr_active_slave; 990 991 if (!new_active) { /* there were no active slaves left */ 992 if (bond->slave_cnt > 0) /* found one slave */ 993 new_active = bond->first_slave; 994 else 995 return NULL; /* still no slave, return NULL */ 996 } 997 998 if ((bond->primary_slave) && 999 bond->primary_slave->link == BOND_LINK_UP && 1000 bond_should_change_active(bond)) { 1001 new_active = bond->primary_slave; 1002 } 1003 1004 /* remember where to stop iterating over the slaves */ 1005 old_active = new_active; 1006 1007 bond_for_each_slave_from(bond, new_active, i, old_active) { 1008 if (new_active->link == BOND_LINK_UP) { 1009 return new_active; 1010 } else if (new_active->link == BOND_LINK_BACK && 1011 IS_UP(new_active->dev)) { 1012 /* link up, but waiting for stabilization */ 1013 if (new_active->delay < mintime) { 1014 mintime = new_active->delay; 1015 bestslave = new_active; 1016 } 1017 } 1018 } 1019 1020 return bestslave; 1021 } 1022 1023 static bool bond_should_notify_peers(struct bonding *bond) 1024 { 1025 struct slave *slave = bond->curr_active_slave; 1026 1027 pr_debug("bond_should_notify_peers: bond %s slave %s\n", 1028 bond->dev->name, slave ? slave->dev->name : "NULL"); 1029 1030 if (!slave || !bond->send_peer_notif || 1031 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) 1032 return false; 1033 1034 bond->send_peer_notif--; 1035 return true; 1036 } 1037 1038 /** 1039 * change_active_interface - change the active slave into the specified one 1040 * @bond: our bonding struct 1041 * @new: the new slave to make the active one 1042 * 1043 * Set the new slave to the bond's settings and unset them on the old 1044 * curr_active_slave. 1045 * Setting include flags, mc-list, promiscuity, allmulti, etc. 1046 * 1047 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, 1048 * because it is apparently the best available slave we have, even though its 1049 * updelay hasn't timed out yet. 1050 * 1051 * If new_active is not NULL, caller must hold bond->lock for read and 1052 * curr_slave_lock for write_bh. 1053 */ 1054 void bond_change_active_slave(struct bonding *bond, struct slave *new_active) 1055 { 1056 struct slave *old_active = bond->curr_active_slave; 1057 1058 if (old_active == new_active) 1059 return; 1060 1061 if (new_active) { 1062 new_active->jiffies = jiffies; 1063 1064 if (new_active->link == BOND_LINK_BACK) { 1065 if (USES_PRIMARY(bond->params.mode)) { 1066 pr_info("%s: making interface %s the new active one %d ms earlier.\n", 1067 bond->dev->name, new_active->dev->name, 1068 (bond->params.updelay - new_active->delay) * bond->params.miimon); 1069 } 1070 1071 new_active->delay = 0; 1072 new_active->link = BOND_LINK_UP; 1073 1074 if (bond->params.mode == BOND_MODE_8023AD) 1075 bond_3ad_handle_link_change(new_active, BOND_LINK_UP); 1076 1077 if (bond_is_lb(bond)) 1078 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); 1079 } else { 1080 if (USES_PRIMARY(bond->params.mode)) { 1081 pr_info("%s: making interface %s the new active one.\n", 1082 bond->dev->name, new_active->dev->name); 1083 } 1084 } 1085 } 1086 1087 if (USES_PRIMARY(bond->params.mode)) 1088 bond_mc_swap(bond, new_active, old_active); 1089 1090 if (bond_is_lb(bond)) { 1091 bond_alb_handle_active_change(bond, new_active); 1092 if (old_active) 1093 bond_set_slave_inactive_flags(old_active); 1094 if (new_active) 1095 bond_set_slave_active_flags(new_active); 1096 } else { 1097 bond->curr_active_slave = new_active; 1098 } 1099 1100 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) { 1101 if (old_active) 1102 bond_set_slave_inactive_flags(old_active); 1103 1104 if (new_active) { 1105 bool should_notify_peers = false; 1106 1107 bond_set_slave_active_flags(new_active); 1108 1109 if (bond->params.fail_over_mac) 1110 bond_do_fail_over_mac(bond, new_active, 1111 old_active); 1112 1113 if (netif_running(bond->dev)) { 1114 bond->send_peer_notif = 1115 bond->params.num_peer_notif; 1116 should_notify_peers = 1117 bond_should_notify_peers(bond); 1118 } 1119 1120 write_unlock_bh(&bond->curr_slave_lock); 1121 read_unlock(&bond->lock); 1122 1123 netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER); 1124 if (should_notify_peers) 1125 netdev_bonding_change(bond->dev, 1126 NETDEV_NOTIFY_PEERS); 1127 1128 read_lock(&bond->lock); 1129 write_lock_bh(&bond->curr_slave_lock); 1130 } 1131 } 1132 1133 /* resend IGMP joins since active slave has changed or 1134 * all were sent on curr_active_slave. 1135 * resend only if bond is brought up with the affected 1136 * bonding modes and the retransmission is enabled */ 1137 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && 1138 ((USES_PRIMARY(bond->params.mode) && new_active) || 1139 bond->params.mode == BOND_MODE_ROUNDROBIN)) { 1140 bond->igmp_retrans = bond->params.resend_igmp; 1141 queue_delayed_work(bond->wq, &bond->mcast_work, 0); 1142 } 1143 } 1144 1145 /** 1146 * bond_select_active_slave - select a new active slave, if needed 1147 * @bond: our bonding struct 1148 * 1149 * This functions should be called when one of the following occurs: 1150 * - The old curr_active_slave has been released or lost its link. 1151 * - The primary_slave has got its link back. 1152 * - A slave has got its link back and there's no old curr_active_slave. 1153 * 1154 * Caller must hold bond->lock for read and curr_slave_lock for write_bh. 1155 */ 1156 void bond_select_active_slave(struct bonding *bond) 1157 { 1158 struct slave *best_slave; 1159 int rv; 1160 1161 best_slave = bond_find_best_slave(bond); 1162 if (best_slave != bond->curr_active_slave) { 1163 bond_change_active_slave(bond, best_slave); 1164 rv = bond_set_carrier(bond); 1165 if (!rv) 1166 return; 1167 1168 if (netif_carrier_ok(bond->dev)) { 1169 pr_info("%s: first active interface up!\n", 1170 bond->dev->name); 1171 } else { 1172 pr_info("%s: now running without any active interface !\n", 1173 bond->dev->name); 1174 } 1175 } 1176 } 1177 1178 /*--------------------------- slave list handling ---------------------------*/ 1179 1180 /* 1181 * This function attaches the slave to the end of list. 1182 * 1183 * bond->lock held for writing by caller. 1184 */ 1185 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave) 1186 { 1187 if (bond->first_slave == NULL) { /* attaching the first slave */ 1188 new_slave->next = new_slave; 1189 new_slave->prev = new_slave; 1190 bond->first_slave = new_slave; 1191 } else { 1192 new_slave->next = bond->first_slave; 1193 new_slave->prev = bond->first_slave->prev; 1194 new_slave->next->prev = new_slave; 1195 new_slave->prev->next = new_slave; 1196 } 1197 1198 bond->slave_cnt++; 1199 } 1200 1201 /* 1202 * This function detaches the slave from the list. 1203 * WARNING: no check is made to verify if the slave effectively 1204 * belongs to <bond>. 1205 * Nothing is freed on return, structures are just unchained. 1206 * If any slave pointer in bond was pointing to <slave>, 1207 * it should be changed by the calling function. 1208 * 1209 * bond->lock held for writing by caller. 1210 */ 1211 static void bond_detach_slave(struct bonding *bond, struct slave *slave) 1212 { 1213 if (slave->next) 1214 slave->next->prev = slave->prev; 1215 1216 if (slave->prev) 1217 slave->prev->next = slave->next; 1218 1219 if (bond->first_slave == slave) { /* slave is the first slave */ 1220 if (bond->slave_cnt > 1) { /* there are more slave */ 1221 bond->first_slave = slave->next; 1222 } else { 1223 bond->first_slave = NULL; /* slave was the last one */ 1224 } 1225 } 1226 1227 slave->next = NULL; 1228 slave->prev = NULL; 1229 bond->slave_cnt--; 1230 } 1231 1232 #ifdef CONFIG_NET_POLL_CONTROLLER 1233 static inline int slave_enable_netpoll(struct slave *slave) 1234 { 1235 struct netpoll *np; 1236 int err = 0; 1237 1238 np = kzalloc(sizeof(*np), GFP_KERNEL); 1239 err = -ENOMEM; 1240 if (!np) 1241 goto out; 1242 1243 err = __netpoll_setup(np, slave->dev); 1244 if (err) { 1245 kfree(np); 1246 goto out; 1247 } 1248 slave->np = np; 1249 out: 1250 return err; 1251 } 1252 static inline void slave_disable_netpoll(struct slave *slave) 1253 { 1254 struct netpoll *np = slave->np; 1255 1256 if (!np) 1257 return; 1258 1259 slave->np = NULL; 1260 synchronize_rcu_bh(); 1261 __netpoll_cleanup(np); 1262 kfree(np); 1263 } 1264 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev) 1265 { 1266 if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL) 1267 return false; 1268 if (!slave_dev->netdev_ops->ndo_poll_controller) 1269 return false; 1270 return true; 1271 } 1272 1273 static void bond_poll_controller(struct net_device *bond_dev) 1274 { 1275 } 1276 1277 static void __bond_netpoll_cleanup(struct bonding *bond) 1278 { 1279 struct slave *slave; 1280 int i; 1281 1282 bond_for_each_slave(bond, slave, i) 1283 if (IS_UP(slave->dev)) 1284 slave_disable_netpoll(slave); 1285 } 1286 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1287 { 1288 struct bonding *bond = netdev_priv(bond_dev); 1289 1290 read_lock(&bond->lock); 1291 __bond_netpoll_cleanup(bond); 1292 read_unlock(&bond->lock); 1293 } 1294 1295 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) 1296 { 1297 struct bonding *bond = netdev_priv(dev); 1298 struct slave *slave; 1299 int i, err = 0; 1300 1301 read_lock(&bond->lock); 1302 bond_for_each_slave(bond, slave, i) { 1303 err = slave_enable_netpoll(slave); 1304 if (err) { 1305 __bond_netpoll_cleanup(bond); 1306 break; 1307 } 1308 } 1309 read_unlock(&bond->lock); 1310 return err; 1311 } 1312 1313 static struct netpoll_info *bond_netpoll_info(struct bonding *bond) 1314 { 1315 return bond->dev->npinfo; 1316 } 1317 1318 #else 1319 static inline int slave_enable_netpoll(struct slave *slave) 1320 { 1321 return 0; 1322 } 1323 static inline void slave_disable_netpoll(struct slave *slave) 1324 { 1325 } 1326 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1327 { 1328 } 1329 #endif 1330 1331 /*---------------------------------- IOCTL ----------------------------------*/ 1332 1333 static int bond_sethwaddr(struct net_device *bond_dev, 1334 struct net_device *slave_dev) 1335 { 1336 pr_debug("bond_dev=%p\n", bond_dev); 1337 pr_debug("slave_dev=%p\n", slave_dev); 1338 pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len); 1339 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len); 1340 return 0; 1341 } 1342 1343 static netdev_features_t bond_fix_features(struct net_device *dev, 1344 netdev_features_t features) 1345 { 1346 struct slave *slave; 1347 struct bonding *bond = netdev_priv(dev); 1348 netdev_features_t mask; 1349 int i; 1350 1351 read_lock(&bond->lock); 1352 1353 if (!bond->first_slave) { 1354 /* Disable adding VLANs to empty bond. But why? --mq */ 1355 features |= NETIF_F_VLAN_CHALLENGED; 1356 goto out; 1357 } 1358 1359 mask = features; 1360 features &= ~NETIF_F_ONE_FOR_ALL; 1361 features |= NETIF_F_ALL_FOR_ALL; 1362 1363 bond_for_each_slave(bond, slave, i) { 1364 features = netdev_increment_features(features, 1365 slave->dev->features, 1366 mask); 1367 } 1368 1369 out: 1370 read_unlock(&bond->lock); 1371 return features; 1372 } 1373 1374 #define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \ 1375 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \ 1376 NETIF_F_HIGHDMA | NETIF_F_LRO) 1377 1378 static void bond_compute_features(struct bonding *bond) 1379 { 1380 struct slave *slave; 1381 struct net_device *bond_dev = bond->dev; 1382 netdev_features_t vlan_features = BOND_VLAN_FEATURES; 1383 unsigned short max_hard_header_len = ETH_HLEN; 1384 int i; 1385 unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE; 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 dst_release_flag &= slave->dev->priv_flags; 1397 if (slave->dev->hard_header_len > max_hard_header_len) 1398 max_hard_header_len = slave->dev->hard_header_len; 1399 } 1400 1401 done: 1402 bond_dev->vlan_features = vlan_features; 1403 bond_dev->hard_header_len = max_hard_header_len; 1404 1405 flags = bond_dev->priv_flags & ~IFF_XMIT_DST_RELEASE; 1406 bond_dev->priv_flags = flags | dst_release_flag; 1407 1408 read_unlock(&bond->lock); 1409 1410 netdev_change_features(bond_dev); 1411 } 1412 1413 static void bond_setup_by_slave(struct net_device *bond_dev, 1414 struct net_device *slave_dev) 1415 { 1416 struct bonding *bond = netdev_priv(bond_dev); 1417 1418 bond_dev->header_ops = slave_dev->header_ops; 1419 1420 bond_dev->type = slave_dev->type; 1421 bond_dev->hard_header_len = slave_dev->hard_header_len; 1422 bond_dev->addr_len = slave_dev->addr_len; 1423 1424 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1425 slave_dev->addr_len); 1426 bond->setup_by_slave = 1; 1427 } 1428 1429 /* On bonding slaves other than the currently active slave, suppress 1430 * duplicates except for alb non-mcast/bcast. 1431 */ 1432 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1433 struct slave *slave, 1434 struct bonding *bond) 1435 { 1436 if (bond_is_slave_inactive(slave)) { 1437 if (bond->params.mode == BOND_MODE_ALB && 1438 skb->pkt_type != PACKET_BROADCAST && 1439 skb->pkt_type != PACKET_MULTICAST) 1440 return false; 1441 return true; 1442 } 1443 return false; 1444 } 1445 1446 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1447 { 1448 struct sk_buff *skb = *pskb; 1449 struct slave *slave; 1450 struct bonding *bond; 1451 int (*recv_probe)(const struct sk_buff *, struct bonding *, 1452 struct slave *); 1453 int ret = RX_HANDLER_ANOTHER; 1454 1455 skb = skb_share_check(skb, GFP_ATOMIC); 1456 if (unlikely(!skb)) 1457 return RX_HANDLER_CONSUMED; 1458 1459 *pskb = skb; 1460 1461 slave = bond_slave_get_rcu(skb->dev); 1462 bond = slave->bond; 1463 1464 if (bond->params.arp_interval) 1465 slave->dev->last_rx = jiffies; 1466 1467 recv_probe = ACCESS_ONCE(bond->recv_probe); 1468 if (recv_probe) { 1469 ret = recv_probe(skb, bond, slave); 1470 if (ret == RX_HANDLER_CONSUMED) { 1471 consume_skb(skb); 1472 return ret; 1473 } 1474 } 1475 1476 if (bond_should_deliver_exact_match(skb, slave, bond)) { 1477 return RX_HANDLER_EXACT; 1478 } 1479 1480 skb->dev = bond->dev; 1481 1482 if (bond->params.mode == BOND_MODE_ALB && 1483 bond->dev->priv_flags & IFF_BRIDGE_PORT && 1484 skb->pkt_type == PACKET_HOST) { 1485 1486 if (unlikely(skb_cow_head(skb, 1487 skb->data - skb_mac_header(skb)))) { 1488 kfree_skb(skb); 1489 return RX_HANDLER_CONSUMED; 1490 } 1491 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN); 1492 } 1493 1494 return ret; 1495 } 1496 1497 /* enslave device <slave> to bond device <master> */ 1498 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev) 1499 { 1500 struct bonding *bond = netdev_priv(bond_dev); 1501 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1502 struct slave *new_slave = NULL; 1503 struct netdev_hw_addr *ha; 1504 struct sockaddr addr; 1505 int link_reporting; 1506 int res = 0; 1507 1508 if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL && 1509 slave_ops->ndo_do_ioctl == NULL) { 1510 pr_warning("%s: Warning: no link monitoring support for %s\n", 1511 bond_dev->name, slave_dev->name); 1512 } 1513 1514 /* already enslaved */ 1515 if (slave_dev->flags & IFF_SLAVE) { 1516 pr_debug("Error, Device was already enslaved\n"); 1517 return -EBUSY; 1518 } 1519 1520 /* vlan challenged mutual exclusion */ 1521 /* no need to lock since we're protected by rtnl_lock */ 1522 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1523 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name); 1524 if (bond_vlan_used(bond)) { 1525 pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n", 1526 bond_dev->name, slave_dev->name, bond_dev->name); 1527 return -EPERM; 1528 } else { 1529 pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n", 1530 bond_dev->name, slave_dev->name, 1531 slave_dev->name, bond_dev->name); 1532 } 1533 } else { 1534 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name); 1535 } 1536 1537 /* 1538 * Old ifenslave binaries are no longer supported. These can 1539 * be identified with moderate accuracy by the state of the slave: 1540 * the current ifenslave will set the interface down prior to 1541 * enslaving it; the old ifenslave will not. 1542 */ 1543 if ((slave_dev->flags & IFF_UP)) { 1544 pr_err("%s is up. This may be due to an out of date ifenslave.\n", 1545 slave_dev->name); 1546 res = -EPERM; 1547 goto err_undo_flags; 1548 } 1549 1550 /* set bonding device ether type by slave - bonding netdevices are 1551 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1552 * there is a need to override some of the type dependent attribs/funcs. 1553 * 1554 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1555 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1556 */ 1557 if (bond->slave_cnt == 0) { 1558 if (bond_dev->type != slave_dev->type) { 1559 pr_debug("%s: change device type from %d to %d\n", 1560 bond_dev->name, 1561 bond_dev->type, slave_dev->type); 1562 1563 res = netdev_bonding_change(bond_dev, 1564 NETDEV_PRE_TYPE_CHANGE); 1565 res = notifier_to_errno(res); 1566 if (res) { 1567 pr_err("%s: refused to change device type\n", 1568 bond_dev->name); 1569 res = -EBUSY; 1570 goto err_undo_flags; 1571 } 1572 1573 /* Flush unicast and multicast addresses */ 1574 dev_uc_flush(bond_dev); 1575 dev_mc_flush(bond_dev); 1576 1577 if (slave_dev->type != ARPHRD_ETHER) 1578 bond_setup_by_slave(bond_dev, slave_dev); 1579 else { 1580 ether_setup(bond_dev); 1581 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1582 } 1583 1584 netdev_bonding_change(bond_dev, 1585 NETDEV_POST_TYPE_CHANGE); 1586 } 1587 } else if (bond_dev->type != slave_dev->type) { 1588 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n", 1589 slave_dev->name, 1590 slave_dev->type, bond_dev->type); 1591 res = -EINVAL; 1592 goto err_undo_flags; 1593 } 1594 1595 if (slave_ops->ndo_set_mac_address == NULL) { 1596 if (bond->slave_cnt == 0) { 1597 pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.", 1598 bond_dev->name); 1599 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1600 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1601 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", 1602 bond_dev->name); 1603 res = -EOPNOTSUPP; 1604 goto err_undo_flags; 1605 } 1606 } 1607 1608 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1609 1610 /* If this is the first slave, then we need to set the master's hardware 1611 * address to be the same as the slave's. */ 1612 if (is_zero_ether_addr(bond->dev->dev_addr)) 1613 memcpy(bond->dev->dev_addr, slave_dev->dev_addr, 1614 slave_dev->addr_len); 1615 1616 1617 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL); 1618 if (!new_slave) { 1619 res = -ENOMEM; 1620 goto err_undo_flags; 1621 } 1622 1623 /* 1624 * Set the new_slave's queue_id to be zero. Queue ID mapping 1625 * is set via sysfs or module option if desired. 1626 */ 1627 new_slave->queue_id = 0; 1628 1629 /* Save slave's original mtu and then set it to match the bond */ 1630 new_slave->original_mtu = slave_dev->mtu; 1631 res = dev_set_mtu(slave_dev, bond->dev->mtu); 1632 if (res) { 1633 pr_debug("Error %d calling dev_set_mtu\n", res); 1634 goto err_free; 1635 } 1636 1637 /* 1638 * Save slave's original ("permanent") mac address for modes 1639 * that need it, and for restoring it upon release, and then 1640 * set it to the master's address 1641 */ 1642 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN); 1643 1644 if (!bond->params.fail_over_mac) { 1645 /* 1646 * Set slave to master's mac address. The application already 1647 * set the master's mac address to that of the first slave 1648 */ 1649 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 1650 addr.sa_family = slave_dev->type; 1651 res = dev_set_mac_address(slave_dev, &addr); 1652 if (res) { 1653 pr_debug("Error %d calling set_mac_address\n", res); 1654 goto err_restore_mtu; 1655 } 1656 } 1657 1658 res = netdev_set_bond_master(slave_dev, bond_dev); 1659 if (res) { 1660 pr_debug("Error %d calling netdev_set_bond_master\n", res); 1661 goto err_restore_mac; 1662 } 1663 1664 /* open the slave since the application closed it */ 1665 res = dev_open(slave_dev); 1666 if (res) { 1667 pr_debug("Opening slave %s failed\n", slave_dev->name); 1668 goto err_unset_master; 1669 } 1670 1671 new_slave->bond = bond; 1672 new_slave->dev = slave_dev; 1673 slave_dev->priv_flags |= IFF_BONDING; 1674 1675 if (bond_is_lb(bond)) { 1676 /* bond_alb_init_slave() must be called before all other stages since 1677 * it might fail and we do not want to have to undo everything 1678 */ 1679 res = bond_alb_init_slave(bond, new_slave); 1680 if (res) 1681 goto err_close; 1682 } 1683 1684 /* If the mode USES_PRIMARY, then the new slave gets the 1685 * master's promisc (and mc) settings only if it becomes the 1686 * curr_active_slave, and that is taken care of later when calling 1687 * bond_change_active() 1688 */ 1689 if (!USES_PRIMARY(bond->params.mode)) { 1690 /* set promiscuity level to new slave */ 1691 if (bond_dev->flags & IFF_PROMISC) { 1692 res = dev_set_promiscuity(slave_dev, 1); 1693 if (res) 1694 goto err_close; 1695 } 1696 1697 /* set allmulti level to new slave */ 1698 if (bond_dev->flags & IFF_ALLMULTI) { 1699 res = dev_set_allmulti(slave_dev, 1); 1700 if (res) 1701 goto err_close; 1702 } 1703 1704 netif_addr_lock_bh(bond_dev); 1705 /* upload master's mc_list to new slave */ 1706 netdev_for_each_mc_addr(ha, bond_dev) 1707 dev_mc_add(slave_dev, ha->addr); 1708 netif_addr_unlock_bh(bond_dev); 1709 } 1710 1711 if (bond->params.mode == BOND_MODE_8023AD) { 1712 /* add lacpdu mc addr to mc list */ 1713 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 1714 1715 dev_mc_add(slave_dev, lacpdu_multicast); 1716 } 1717 1718 bond_add_vlans_on_slave(bond, slave_dev); 1719 1720 write_lock_bh(&bond->lock); 1721 1722 bond_attach_slave(bond, new_slave); 1723 1724 new_slave->delay = 0; 1725 new_slave->link_failure_count = 0; 1726 1727 write_unlock_bh(&bond->lock); 1728 1729 bond_compute_features(bond); 1730 1731 read_lock(&bond->lock); 1732 1733 new_slave->last_arp_rx = jiffies - 1734 (msecs_to_jiffies(bond->params.arp_interval) + 1); 1735 1736 if (bond->params.miimon && !bond->params.use_carrier) { 1737 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 1738 1739 if ((link_reporting == -1) && !bond->params.arp_interval) { 1740 /* 1741 * miimon is set but a bonded network driver 1742 * does not support ETHTOOL/MII and 1743 * arp_interval is not set. Note: if 1744 * use_carrier is enabled, we will never go 1745 * here (because netif_carrier is always 1746 * supported); thus, we don't need to change 1747 * the messages for netif_carrier. 1748 */ 1749 pr_warning("%s: Warning: MII and ETHTOOL support not available for interface %s, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details.\n", 1750 bond_dev->name, slave_dev->name); 1751 } else if (link_reporting == -1) { 1752 /* unable get link status using mii/ethtool */ 1753 pr_warning("%s: Warning: can't get link status from interface %s; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface.\n", 1754 bond_dev->name, slave_dev->name); 1755 } 1756 } 1757 1758 /* check for initial state */ 1759 if (bond->params.miimon) { 1760 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { 1761 if (bond->params.updelay) { 1762 new_slave->link = BOND_LINK_BACK; 1763 new_slave->delay = bond->params.updelay; 1764 } else { 1765 new_slave->link = BOND_LINK_UP; 1766 } 1767 } else { 1768 new_slave->link = BOND_LINK_DOWN; 1769 } 1770 } else if (bond->params.arp_interval) { 1771 new_slave->link = (netif_carrier_ok(slave_dev) ? 1772 BOND_LINK_UP : BOND_LINK_DOWN); 1773 } else { 1774 new_slave->link = BOND_LINK_UP; 1775 } 1776 1777 if (new_slave->link != BOND_LINK_DOWN) 1778 new_slave->jiffies = jiffies; 1779 pr_debug("Initial state of slave_dev is BOND_LINK_%s\n", 1780 new_slave->link == BOND_LINK_DOWN ? "DOWN" : 1781 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); 1782 1783 bond_update_speed_duplex(new_slave); 1784 1785 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) { 1786 /* if there is a primary slave, remember it */ 1787 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 1788 bond->primary_slave = new_slave; 1789 bond->force_primary = true; 1790 } 1791 } 1792 1793 write_lock_bh(&bond->curr_slave_lock); 1794 1795 switch (bond->params.mode) { 1796 case BOND_MODE_ACTIVEBACKUP: 1797 bond_set_slave_inactive_flags(new_slave); 1798 bond_select_active_slave(bond); 1799 break; 1800 case BOND_MODE_8023AD: 1801 /* in 802.3ad mode, the internal mechanism 1802 * will activate the slaves in the selected 1803 * aggregator 1804 */ 1805 bond_set_slave_inactive_flags(new_slave); 1806 /* if this is the first slave */ 1807 if (bond->slave_cnt == 1) { 1808 SLAVE_AD_INFO(new_slave).id = 1; 1809 /* Initialize AD with the number of times that the AD timer is called in 1 second 1810 * can be called only after the mac address of the bond is set 1811 */ 1812 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL); 1813 } else { 1814 SLAVE_AD_INFO(new_slave).id = 1815 SLAVE_AD_INFO(new_slave->prev).id + 1; 1816 } 1817 1818 bond_3ad_bind_slave(new_slave); 1819 break; 1820 case BOND_MODE_TLB: 1821 case BOND_MODE_ALB: 1822 bond_set_active_slave(new_slave); 1823 bond_set_slave_inactive_flags(new_slave); 1824 bond_select_active_slave(bond); 1825 break; 1826 default: 1827 pr_debug("This slave is always active in trunk mode\n"); 1828 1829 /* always active in trunk mode */ 1830 bond_set_active_slave(new_slave); 1831 1832 /* In trunking mode there is little meaning to curr_active_slave 1833 * anyway (it holds no special properties of the bond device), 1834 * so we can change it without calling change_active_interface() 1835 */ 1836 if (!bond->curr_active_slave) 1837 bond->curr_active_slave = new_slave; 1838 1839 break; 1840 } /* switch(bond_mode) */ 1841 1842 write_unlock_bh(&bond->curr_slave_lock); 1843 1844 bond_set_carrier(bond); 1845 1846 #ifdef CONFIG_NET_POLL_CONTROLLER 1847 slave_dev->npinfo = bond_netpoll_info(bond); 1848 if (slave_dev->npinfo) { 1849 if (slave_enable_netpoll(new_slave)) { 1850 read_unlock(&bond->lock); 1851 pr_info("Error, %s: master_dev is using netpoll, " 1852 "but new slave device does not support netpoll.\n", 1853 bond_dev->name); 1854 res = -EBUSY; 1855 goto err_detach; 1856 } 1857 } 1858 #endif 1859 1860 read_unlock(&bond->lock); 1861 1862 res = bond_create_slave_symlinks(bond_dev, slave_dev); 1863 if (res) 1864 goto err_detach; 1865 1866 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 1867 new_slave); 1868 if (res) { 1869 pr_debug("Error %d calling netdev_rx_handler_register\n", res); 1870 goto err_dest_symlinks; 1871 } 1872 1873 pr_info("%s: enslaving %s as a%s interface with a%s link.\n", 1874 bond_dev->name, slave_dev->name, 1875 bond_is_active_slave(new_slave) ? "n active" : " backup", 1876 new_slave->link != BOND_LINK_DOWN ? "n up" : " down"); 1877 1878 /* enslave is successful */ 1879 return 0; 1880 1881 /* Undo stages on error */ 1882 err_dest_symlinks: 1883 bond_destroy_slave_symlinks(bond_dev, slave_dev); 1884 1885 err_detach: 1886 write_lock_bh(&bond->lock); 1887 bond_detach_slave(bond, new_slave); 1888 write_unlock_bh(&bond->lock); 1889 1890 err_close: 1891 dev_close(slave_dev); 1892 1893 err_unset_master: 1894 netdev_set_bond_master(slave_dev, NULL); 1895 1896 err_restore_mac: 1897 if (!bond->params.fail_over_mac) { 1898 /* XXX TODO - fom follow mode needs to change master's 1899 * MAC if this slave's MAC is in use by the bond, or at 1900 * least print a warning. 1901 */ 1902 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN); 1903 addr.sa_family = slave_dev->type; 1904 dev_set_mac_address(slave_dev, &addr); 1905 } 1906 1907 err_restore_mtu: 1908 dev_set_mtu(slave_dev, new_slave->original_mtu); 1909 1910 err_free: 1911 kfree(new_slave); 1912 1913 err_undo_flags: 1914 bond_compute_features(bond); 1915 1916 return res; 1917 } 1918 1919 /* 1920 * Try to release the slave device <slave> from the bond device <master> 1921 * It is legal to access curr_active_slave without a lock because all the function 1922 * is write-locked. 1923 * 1924 * The rules for slave state should be: 1925 * for Active/Backup: 1926 * Active stays on all backups go down 1927 * for Bonded connections: 1928 * The first up interface should be left on and all others downed. 1929 */ 1930 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 1931 { 1932 struct bonding *bond = netdev_priv(bond_dev); 1933 struct slave *slave, *oldcurrent; 1934 struct sockaddr addr; 1935 netdev_features_t old_features = bond_dev->features; 1936 1937 /* slave is not a slave or master is not master of this slave */ 1938 if (!(slave_dev->flags & IFF_SLAVE) || 1939 (slave_dev->master != bond_dev)) { 1940 pr_err("%s: Error: cannot release %s.\n", 1941 bond_dev->name, slave_dev->name); 1942 return -EINVAL; 1943 } 1944 1945 block_netpoll_tx(); 1946 netdev_bonding_change(bond_dev, NETDEV_RELEASE); 1947 write_lock_bh(&bond->lock); 1948 1949 slave = bond_get_slave_by_dev(bond, slave_dev); 1950 if (!slave) { 1951 /* not a slave of this bond */ 1952 pr_info("%s: %s not enslaved\n", 1953 bond_dev->name, slave_dev->name); 1954 write_unlock_bh(&bond->lock); 1955 unblock_netpoll_tx(); 1956 return -EINVAL; 1957 } 1958 1959 /* unregister rx_handler early so bond_handle_frame wouldn't be called 1960 * for this slave anymore. 1961 */ 1962 netdev_rx_handler_unregister(slave_dev); 1963 write_unlock_bh(&bond->lock); 1964 synchronize_net(); 1965 write_lock_bh(&bond->lock); 1966 1967 if (!bond->params.fail_over_mac) { 1968 if (ether_addr_equal(bond_dev->dev_addr, slave->perm_hwaddr) && 1969 bond->slave_cnt > 1) 1970 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", 1971 bond_dev->name, slave_dev->name, 1972 slave->perm_hwaddr, 1973 bond_dev->name, slave_dev->name); 1974 } 1975 1976 /* Inform AD package of unbinding of slave. */ 1977 if (bond->params.mode == BOND_MODE_8023AD) { 1978 /* must be called before the slave is 1979 * detached from the list 1980 */ 1981 bond_3ad_unbind_slave(slave); 1982 } 1983 1984 pr_info("%s: releasing %s interface %s\n", 1985 bond_dev->name, 1986 bond_is_active_slave(slave) ? "active" : "backup", 1987 slave_dev->name); 1988 1989 oldcurrent = bond->curr_active_slave; 1990 1991 bond->current_arp_slave = NULL; 1992 1993 /* release the slave from its bond */ 1994 bond_detach_slave(bond, slave); 1995 1996 if (bond->primary_slave == slave) 1997 bond->primary_slave = NULL; 1998 1999 if (oldcurrent == slave) 2000 bond_change_active_slave(bond, NULL); 2001 2002 if (bond_is_lb(bond)) { 2003 /* Must be called only after the slave has been 2004 * detached from the list and the curr_active_slave 2005 * has been cleared (if our_slave == old_current), 2006 * but before a new active slave is selected. 2007 */ 2008 write_unlock_bh(&bond->lock); 2009 bond_alb_deinit_slave(bond, slave); 2010 write_lock_bh(&bond->lock); 2011 } 2012 2013 if (oldcurrent == slave) { 2014 /* 2015 * Note that we hold RTNL over this sequence, so there 2016 * is no concern that another slave add/remove event 2017 * will interfere. 2018 */ 2019 write_unlock_bh(&bond->lock); 2020 read_lock(&bond->lock); 2021 write_lock_bh(&bond->curr_slave_lock); 2022 2023 bond_select_active_slave(bond); 2024 2025 write_unlock_bh(&bond->curr_slave_lock); 2026 read_unlock(&bond->lock); 2027 write_lock_bh(&bond->lock); 2028 } 2029 2030 if (bond->slave_cnt == 0) { 2031 bond_set_carrier(bond); 2032 2033 /* if the last slave was removed, zero the mac address 2034 * of the master so it will be set by the application 2035 * to the mac address of the first slave 2036 */ 2037 memset(bond_dev->dev_addr, 0, bond_dev->addr_len); 2038 2039 if (bond_vlan_used(bond)) { 2040 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n", 2041 bond_dev->name, bond_dev->name); 2042 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n", 2043 bond_dev->name); 2044 } 2045 } 2046 2047 write_unlock_bh(&bond->lock); 2048 unblock_netpoll_tx(); 2049 2050 if (bond->slave_cnt == 0) 2051 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 2052 2053 bond_compute_features(bond); 2054 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 2055 (old_features & NETIF_F_VLAN_CHALLENGED)) 2056 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n", 2057 bond_dev->name, slave_dev->name, bond_dev->name); 2058 2059 /* must do this from outside any spinlocks */ 2060 bond_destroy_slave_symlinks(bond_dev, slave_dev); 2061 2062 bond_del_vlans_from_slave(bond, slave_dev); 2063 2064 /* If the mode USES_PRIMARY, then we should only remove its 2065 * promisc and mc settings if it was the curr_active_slave, but that was 2066 * already taken care of above when we detached the slave 2067 */ 2068 if (!USES_PRIMARY(bond->params.mode)) { 2069 /* unset promiscuity level from slave */ 2070 if (bond_dev->flags & IFF_PROMISC) 2071 dev_set_promiscuity(slave_dev, -1); 2072 2073 /* unset allmulti level from slave */ 2074 if (bond_dev->flags & IFF_ALLMULTI) 2075 dev_set_allmulti(slave_dev, -1); 2076 2077 /* flush master's mc_list from slave */ 2078 netif_addr_lock_bh(bond_dev); 2079 bond_mc_list_flush(bond_dev, slave_dev); 2080 netif_addr_unlock_bh(bond_dev); 2081 } 2082 2083 netdev_set_bond_master(slave_dev, NULL); 2084 2085 slave_disable_netpoll(slave); 2086 2087 /* close slave before restoring its mac address */ 2088 dev_close(slave_dev); 2089 2090 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 2091 /* restore original ("permanent") mac address */ 2092 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN); 2093 addr.sa_family = slave_dev->type; 2094 dev_set_mac_address(slave_dev, &addr); 2095 } 2096 2097 dev_set_mtu(slave_dev, slave->original_mtu); 2098 2099 slave_dev->priv_flags &= ~IFF_BONDING; 2100 2101 kfree(slave); 2102 2103 return 0; /* deletion OK */ 2104 } 2105 2106 /* 2107 * First release a slave and then destroy the bond if no more slaves are left. 2108 * Must be under rtnl_lock when this function is called. 2109 */ 2110 static int bond_release_and_destroy(struct net_device *bond_dev, 2111 struct net_device *slave_dev) 2112 { 2113 struct bonding *bond = netdev_priv(bond_dev); 2114 int ret; 2115 2116 ret = bond_release(bond_dev, slave_dev); 2117 if ((ret == 0) && (bond->slave_cnt == 0)) { 2118 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 2119 pr_info("%s: destroying bond %s.\n", 2120 bond_dev->name, bond_dev->name); 2121 unregister_netdevice(bond_dev); 2122 } 2123 return ret; 2124 } 2125 2126 /* 2127 * This function releases all slaves. 2128 */ 2129 static int bond_release_all(struct net_device *bond_dev) 2130 { 2131 struct bonding *bond = netdev_priv(bond_dev); 2132 struct slave *slave; 2133 struct net_device *slave_dev; 2134 struct sockaddr addr; 2135 2136 write_lock_bh(&bond->lock); 2137 2138 netif_carrier_off(bond_dev); 2139 2140 if (bond->slave_cnt == 0) 2141 goto out; 2142 2143 bond->current_arp_slave = NULL; 2144 bond->primary_slave = NULL; 2145 bond_change_active_slave(bond, NULL); 2146 2147 while ((slave = bond->first_slave) != NULL) { 2148 /* Inform AD package of unbinding of slave 2149 * before slave is detached from the list. 2150 */ 2151 if (bond->params.mode == BOND_MODE_8023AD) 2152 bond_3ad_unbind_slave(slave); 2153 2154 slave_dev = slave->dev; 2155 bond_detach_slave(bond, slave); 2156 2157 /* now that the slave is detached, unlock and perform 2158 * all the undo steps that should not be called from 2159 * within a lock. 2160 */ 2161 write_unlock_bh(&bond->lock); 2162 2163 /* unregister rx_handler early so bond_handle_frame wouldn't 2164 * be called for this slave anymore. 2165 */ 2166 netdev_rx_handler_unregister(slave_dev); 2167 synchronize_net(); 2168 2169 if (bond_is_lb(bond)) { 2170 /* must be called only after the slave 2171 * has been detached from the list 2172 */ 2173 bond_alb_deinit_slave(bond, slave); 2174 } 2175 2176 bond_destroy_slave_symlinks(bond_dev, slave_dev); 2177 bond_del_vlans_from_slave(bond, slave_dev); 2178 2179 /* If the mode USES_PRIMARY, then we should only remove its 2180 * promisc and mc settings if it was the curr_active_slave, but that was 2181 * already taken care of above when we detached the slave 2182 */ 2183 if (!USES_PRIMARY(bond->params.mode)) { 2184 /* unset promiscuity level from slave */ 2185 if (bond_dev->flags & IFF_PROMISC) 2186 dev_set_promiscuity(slave_dev, -1); 2187 2188 /* unset allmulti level from slave */ 2189 if (bond_dev->flags & IFF_ALLMULTI) 2190 dev_set_allmulti(slave_dev, -1); 2191 2192 /* flush master's mc_list from slave */ 2193 netif_addr_lock_bh(bond_dev); 2194 bond_mc_list_flush(bond_dev, slave_dev); 2195 netif_addr_unlock_bh(bond_dev); 2196 } 2197 2198 netdev_set_bond_master(slave_dev, NULL); 2199 2200 slave_disable_netpoll(slave); 2201 2202 /* close slave before restoring its mac address */ 2203 dev_close(slave_dev); 2204 2205 if (!bond->params.fail_over_mac) { 2206 /* restore original ("permanent") mac address*/ 2207 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN); 2208 addr.sa_family = slave_dev->type; 2209 dev_set_mac_address(slave_dev, &addr); 2210 } 2211 2212 kfree(slave); 2213 2214 /* re-acquire the lock before getting the next slave */ 2215 write_lock_bh(&bond->lock); 2216 } 2217 2218 /* zero the mac address of the master so it will be 2219 * set by the application to the mac address of the 2220 * first slave 2221 */ 2222 memset(bond_dev->dev_addr, 0, bond_dev->addr_len); 2223 2224 if (bond_vlan_used(bond)) { 2225 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n", 2226 bond_dev->name, bond_dev->name); 2227 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n", 2228 bond_dev->name); 2229 } 2230 2231 pr_info("%s: released all slaves\n", bond_dev->name); 2232 2233 out: 2234 write_unlock_bh(&bond->lock); 2235 2236 bond_compute_features(bond); 2237 2238 return 0; 2239 } 2240 2241 /* 2242 * This function changes the active slave to slave <slave_dev>. 2243 * It returns -EINVAL in the following cases. 2244 * - <slave_dev> is not found in the list. 2245 * - There is not active slave now. 2246 * - <slave_dev> is already active. 2247 * - The link state of <slave_dev> is not BOND_LINK_UP. 2248 * - <slave_dev> is not running. 2249 * In these cases, this function does nothing. 2250 * In the other cases, current_slave pointer is changed and 0 is returned. 2251 */ 2252 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev) 2253 { 2254 struct bonding *bond = netdev_priv(bond_dev); 2255 struct slave *old_active = NULL; 2256 struct slave *new_active = NULL; 2257 int res = 0; 2258 2259 if (!USES_PRIMARY(bond->params.mode)) 2260 return -EINVAL; 2261 2262 /* Verify that master_dev is indeed the master of slave_dev */ 2263 if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev)) 2264 return -EINVAL; 2265 2266 read_lock(&bond->lock); 2267 2268 read_lock(&bond->curr_slave_lock); 2269 old_active = bond->curr_active_slave; 2270 read_unlock(&bond->curr_slave_lock); 2271 2272 new_active = bond_get_slave_by_dev(bond, slave_dev); 2273 2274 /* 2275 * Changing to the current active: do nothing; return success. 2276 */ 2277 if (new_active && (new_active == old_active)) { 2278 read_unlock(&bond->lock); 2279 return 0; 2280 } 2281 2282 if ((new_active) && 2283 (old_active) && 2284 (new_active->link == BOND_LINK_UP) && 2285 IS_UP(new_active->dev)) { 2286 block_netpoll_tx(); 2287 write_lock_bh(&bond->curr_slave_lock); 2288 bond_change_active_slave(bond, new_active); 2289 write_unlock_bh(&bond->curr_slave_lock); 2290 unblock_netpoll_tx(); 2291 } else 2292 res = -EINVAL; 2293 2294 read_unlock(&bond->lock); 2295 2296 return res; 2297 } 2298 2299 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info) 2300 { 2301 struct bonding *bond = netdev_priv(bond_dev); 2302 2303 info->bond_mode = bond->params.mode; 2304 info->miimon = bond->params.miimon; 2305 2306 read_lock(&bond->lock); 2307 info->num_slaves = bond->slave_cnt; 2308 read_unlock(&bond->lock); 2309 2310 return 0; 2311 } 2312 2313 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 2314 { 2315 struct bonding *bond = netdev_priv(bond_dev); 2316 struct slave *slave; 2317 int i, res = -ENODEV; 2318 2319 read_lock(&bond->lock); 2320 2321 bond_for_each_slave(bond, slave, i) { 2322 if (i == (int)info->slave_id) { 2323 res = 0; 2324 strcpy(info->slave_name, slave->dev->name); 2325 info->link = slave->link; 2326 info->state = bond_slave_state(slave); 2327 info->link_failure_count = slave->link_failure_count; 2328 break; 2329 } 2330 } 2331 2332 read_unlock(&bond->lock); 2333 2334 return res; 2335 } 2336 2337 /*-------------------------------- Monitoring -------------------------------*/ 2338 2339 2340 static int bond_miimon_inspect(struct bonding *bond) 2341 { 2342 struct slave *slave; 2343 int i, link_state, commit = 0; 2344 bool ignore_updelay; 2345 2346 ignore_updelay = !bond->curr_active_slave ? true : false; 2347 2348 bond_for_each_slave(bond, slave, i) { 2349 slave->new_link = BOND_LINK_NOCHANGE; 2350 2351 link_state = bond_check_dev_link(bond, slave->dev, 0); 2352 2353 switch (slave->link) { 2354 case BOND_LINK_UP: 2355 if (link_state) 2356 continue; 2357 2358 slave->link = BOND_LINK_FAIL; 2359 slave->delay = bond->params.downdelay; 2360 if (slave->delay) { 2361 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n", 2362 bond->dev->name, 2363 (bond->params.mode == 2364 BOND_MODE_ACTIVEBACKUP) ? 2365 (bond_is_active_slave(slave) ? 2366 "active " : "backup ") : "", 2367 slave->dev->name, 2368 bond->params.downdelay * bond->params.miimon); 2369 } 2370 /*FALLTHRU*/ 2371 case BOND_LINK_FAIL: 2372 if (link_state) { 2373 /* 2374 * recovered before downdelay expired 2375 */ 2376 slave->link = BOND_LINK_UP; 2377 slave->jiffies = jiffies; 2378 pr_info("%s: link status up again after %d ms for interface %s.\n", 2379 bond->dev->name, 2380 (bond->params.downdelay - slave->delay) * 2381 bond->params.miimon, 2382 slave->dev->name); 2383 continue; 2384 } 2385 2386 if (slave->delay <= 0) { 2387 slave->new_link = BOND_LINK_DOWN; 2388 commit++; 2389 continue; 2390 } 2391 2392 slave->delay--; 2393 break; 2394 2395 case BOND_LINK_DOWN: 2396 if (!link_state) 2397 continue; 2398 2399 slave->link = BOND_LINK_BACK; 2400 slave->delay = bond->params.updelay; 2401 2402 if (slave->delay) { 2403 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n", 2404 bond->dev->name, slave->dev->name, 2405 ignore_updelay ? 0 : 2406 bond->params.updelay * 2407 bond->params.miimon); 2408 } 2409 /*FALLTHRU*/ 2410 case BOND_LINK_BACK: 2411 if (!link_state) { 2412 slave->link = BOND_LINK_DOWN; 2413 pr_info("%s: link status down again after %d ms for interface %s.\n", 2414 bond->dev->name, 2415 (bond->params.updelay - slave->delay) * 2416 bond->params.miimon, 2417 slave->dev->name); 2418 2419 continue; 2420 } 2421 2422 if (ignore_updelay) 2423 slave->delay = 0; 2424 2425 if (slave->delay <= 0) { 2426 slave->new_link = BOND_LINK_UP; 2427 commit++; 2428 ignore_updelay = false; 2429 continue; 2430 } 2431 2432 slave->delay--; 2433 break; 2434 } 2435 } 2436 2437 return commit; 2438 } 2439 2440 static void bond_miimon_commit(struct bonding *bond) 2441 { 2442 struct slave *slave; 2443 int i; 2444 2445 bond_for_each_slave(bond, slave, i) { 2446 switch (slave->new_link) { 2447 case BOND_LINK_NOCHANGE: 2448 continue; 2449 2450 case BOND_LINK_UP: 2451 slave->link = BOND_LINK_UP; 2452 slave->jiffies = jiffies; 2453 2454 if (bond->params.mode == BOND_MODE_8023AD) { 2455 /* prevent it from being the active one */ 2456 bond_set_backup_slave(slave); 2457 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) { 2458 /* make it immediately active */ 2459 bond_set_active_slave(slave); 2460 } else if (slave != bond->primary_slave) { 2461 /* prevent it from being the active one */ 2462 bond_set_backup_slave(slave); 2463 } 2464 2465 bond_update_speed_duplex(slave); 2466 2467 pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n", 2468 bond->dev->name, slave->dev->name, 2469 slave->speed, slave->duplex ? "full" : "half"); 2470 2471 /* notify ad that the link status has changed */ 2472 if (bond->params.mode == BOND_MODE_8023AD) 2473 bond_3ad_handle_link_change(slave, BOND_LINK_UP); 2474 2475 if (bond_is_lb(bond)) 2476 bond_alb_handle_link_change(bond, slave, 2477 BOND_LINK_UP); 2478 2479 if (!bond->curr_active_slave || 2480 (slave == bond->primary_slave)) 2481 goto do_failover; 2482 2483 continue; 2484 2485 case BOND_LINK_DOWN: 2486 if (slave->link_failure_count < UINT_MAX) 2487 slave->link_failure_count++; 2488 2489 slave->link = BOND_LINK_DOWN; 2490 2491 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP || 2492 bond->params.mode == BOND_MODE_8023AD) 2493 bond_set_slave_inactive_flags(slave); 2494 2495 pr_info("%s: link status definitely down for interface %s, disabling it\n", 2496 bond->dev->name, slave->dev->name); 2497 2498 if (bond->params.mode == BOND_MODE_8023AD) 2499 bond_3ad_handle_link_change(slave, 2500 BOND_LINK_DOWN); 2501 2502 if (bond_is_lb(bond)) 2503 bond_alb_handle_link_change(bond, slave, 2504 BOND_LINK_DOWN); 2505 2506 if (slave == bond->curr_active_slave) 2507 goto do_failover; 2508 2509 continue; 2510 2511 default: 2512 pr_err("%s: invalid new link %d on slave %s\n", 2513 bond->dev->name, slave->new_link, 2514 slave->dev->name); 2515 slave->new_link = BOND_LINK_NOCHANGE; 2516 2517 continue; 2518 } 2519 2520 do_failover: 2521 ASSERT_RTNL(); 2522 block_netpoll_tx(); 2523 write_lock_bh(&bond->curr_slave_lock); 2524 bond_select_active_slave(bond); 2525 write_unlock_bh(&bond->curr_slave_lock); 2526 unblock_netpoll_tx(); 2527 } 2528 2529 bond_set_carrier(bond); 2530 } 2531 2532 /* 2533 * bond_mii_monitor 2534 * 2535 * Really a wrapper that splits the mii monitor into two phases: an 2536 * inspection, then (if inspection indicates something needs to be done) 2537 * an acquisition of appropriate locks followed by a commit phase to 2538 * implement whatever link state changes are indicated. 2539 */ 2540 void bond_mii_monitor(struct work_struct *work) 2541 { 2542 struct bonding *bond = container_of(work, struct bonding, 2543 mii_work.work); 2544 bool should_notify_peers = false; 2545 unsigned long delay; 2546 2547 read_lock(&bond->lock); 2548 2549 delay = msecs_to_jiffies(bond->params.miimon); 2550 2551 if (bond->slave_cnt == 0) 2552 goto re_arm; 2553 2554 should_notify_peers = bond_should_notify_peers(bond); 2555 2556 if (bond_miimon_inspect(bond)) { 2557 read_unlock(&bond->lock); 2558 2559 /* Race avoidance with bond_close cancel of workqueue */ 2560 if (!rtnl_trylock()) { 2561 read_lock(&bond->lock); 2562 delay = 1; 2563 should_notify_peers = false; 2564 goto re_arm; 2565 } 2566 2567 read_lock(&bond->lock); 2568 2569 bond_miimon_commit(bond); 2570 2571 read_unlock(&bond->lock); 2572 rtnl_unlock(); /* might sleep, hold no other locks */ 2573 read_lock(&bond->lock); 2574 } 2575 2576 re_arm: 2577 if (bond->params.miimon) 2578 queue_delayed_work(bond->wq, &bond->mii_work, delay); 2579 2580 read_unlock(&bond->lock); 2581 2582 if (should_notify_peers) { 2583 if (!rtnl_trylock()) { 2584 read_lock(&bond->lock); 2585 bond->send_peer_notif++; 2586 read_unlock(&bond->lock); 2587 return; 2588 } 2589 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS); 2590 rtnl_unlock(); 2591 } 2592 } 2593 2594 static int bond_has_this_ip(struct bonding *bond, __be32 ip) 2595 { 2596 struct vlan_entry *vlan; 2597 struct net_device *vlan_dev; 2598 2599 if (ip == bond_confirm_addr(bond->dev, 0, ip)) 2600 return 1; 2601 2602 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 2603 rcu_read_lock(); 2604 vlan_dev = __vlan_find_dev_deep(bond->dev, vlan->vlan_id); 2605 rcu_read_unlock(); 2606 if (vlan_dev && ip == bond_confirm_addr(vlan_dev, 0, ip)) 2607 return 1; 2608 } 2609 2610 return 0; 2611 } 2612 2613 /* 2614 * We go to the (large) trouble of VLAN tagging ARP frames because 2615 * switches in VLAN mode (especially if ports are configured as 2616 * "native" to a VLAN) might not pass non-tagged frames. 2617 */ 2618 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id) 2619 { 2620 struct sk_buff *skb; 2621 2622 pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op, 2623 slave_dev->name, dest_ip, src_ip, vlan_id); 2624 2625 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2626 NULL, slave_dev->dev_addr, NULL); 2627 2628 if (!skb) { 2629 pr_err("ARP packet allocation failed\n"); 2630 return; 2631 } 2632 if (vlan_id) { 2633 skb = vlan_put_tag(skb, vlan_id); 2634 if (!skb) { 2635 pr_err("failed to insert VLAN tag\n"); 2636 return; 2637 } 2638 } 2639 arp_xmit(skb); 2640 } 2641 2642 2643 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2644 { 2645 int i, vlan_id; 2646 __be32 *targets = bond->params.arp_targets; 2647 struct vlan_entry *vlan; 2648 struct net_device *vlan_dev = NULL; 2649 struct rtable *rt; 2650 2651 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) { 2652 __be32 addr; 2653 if (!targets[i]) 2654 break; 2655 pr_debug("basa: target %x\n", targets[i]); 2656 if (!bond_vlan_used(bond)) { 2657 pr_debug("basa: empty vlan: arp_send\n"); 2658 addr = bond_confirm_addr(bond->dev, targets[i], 0); 2659 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2660 addr, 0); 2661 continue; 2662 } 2663 2664 /* 2665 * If VLANs are configured, we do a route lookup to 2666 * determine which VLAN interface would be used, so we 2667 * can tag the ARP with the proper VLAN tag. 2668 */ 2669 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 2670 RTO_ONLINK, 0); 2671 if (IS_ERR(rt)) { 2672 if (net_ratelimit()) { 2673 pr_warning("%s: no route to arp_ip_target %pI4\n", 2674 bond->dev->name, &targets[i]); 2675 } 2676 continue; 2677 } 2678 2679 /* 2680 * This target is not on a VLAN 2681 */ 2682 if (rt->dst.dev == bond->dev) { 2683 ip_rt_put(rt); 2684 pr_debug("basa: rtdev == bond->dev: arp_send\n"); 2685 addr = bond_confirm_addr(bond->dev, targets[i], 0); 2686 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2687 addr, 0); 2688 continue; 2689 } 2690 2691 vlan_id = 0; 2692 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 2693 rcu_read_lock(); 2694 vlan_dev = __vlan_find_dev_deep(bond->dev, 2695 vlan->vlan_id); 2696 rcu_read_unlock(); 2697 if (vlan_dev == rt->dst.dev) { 2698 vlan_id = vlan->vlan_id; 2699 pr_debug("basa: vlan match on %s %d\n", 2700 vlan_dev->name, vlan_id); 2701 break; 2702 } 2703 } 2704 2705 if (vlan_id && vlan_dev) { 2706 ip_rt_put(rt); 2707 addr = bond_confirm_addr(vlan_dev, targets[i], 0); 2708 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2709 addr, vlan_id); 2710 continue; 2711 } 2712 2713 if (net_ratelimit()) { 2714 pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n", 2715 bond->dev->name, &targets[i], 2716 rt->dst.dev ? rt->dst.dev->name : "NULL"); 2717 } 2718 ip_rt_put(rt); 2719 } 2720 } 2721 2722 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 2723 { 2724 int i; 2725 __be32 *targets = bond->params.arp_targets; 2726 2727 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) { 2728 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n", 2729 &sip, &tip, i, &targets[i], 2730 bond_has_this_ip(bond, tip)); 2731 if (sip == targets[i]) { 2732 if (bond_has_this_ip(bond, tip)) 2733 slave->last_arp_rx = jiffies; 2734 return; 2735 } 2736 } 2737 } 2738 2739 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, 2740 struct slave *slave) 2741 { 2742 struct arphdr *arp = (struct arphdr *)skb->data; 2743 unsigned char *arp_ptr; 2744 __be32 sip, tip; 2745 int alen; 2746 2747 if (skb->protocol != __cpu_to_be16(ETH_P_ARP)) 2748 return RX_HANDLER_ANOTHER; 2749 2750 read_lock(&bond->lock); 2751 alen = arp_hdr_len(bond->dev); 2752 2753 pr_debug("bond_arp_rcv: bond %s skb->dev %s\n", 2754 bond->dev->name, skb->dev->name); 2755 2756 if (alen > skb_headlen(skb)) { 2757 arp = kmalloc(alen, GFP_ATOMIC); 2758 if (!arp) 2759 goto out_unlock; 2760 if (skb_copy_bits(skb, 0, arp, alen) < 0) 2761 goto out_unlock; 2762 } 2763 2764 if (arp->ar_hln != bond->dev->addr_len || 2765 skb->pkt_type == PACKET_OTHERHOST || 2766 skb->pkt_type == PACKET_LOOPBACK || 2767 arp->ar_hrd != htons(ARPHRD_ETHER) || 2768 arp->ar_pro != htons(ETH_P_IP) || 2769 arp->ar_pln != 4) 2770 goto out_unlock; 2771 2772 arp_ptr = (unsigned char *)(arp + 1); 2773 arp_ptr += bond->dev->addr_len; 2774 memcpy(&sip, arp_ptr, 4); 2775 arp_ptr += 4 + bond->dev->addr_len; 2776 memcpy(&tip, arp_ptr, 4); 2777 2778 pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n", 2779 bond->dev->name, slave->dev->name, bond_slave_state(slave), 2780 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 2781 &sip, &tip); 2782 2783 /* 2784 * Backup slaves won't see the ARP reply, but do come through 2785 * here for each ARP probe (so we swap the sip/tip to validate 2786 * the probe). In a "redundant switch, common router" type of 2787 * configuration, the ARP probe will (hopefully) travel from 2788 * the active, through one switch, the router, then the other 2789 * switch before reaching the backup. 2790 */ 2791 if (bond_is_active_slave(slave)) 2792 bond_validate_arp(bond, slave, sip, tip); 2793 else 2794 bond_validate_arp(bond, slave, tip, sip); 2795 2796 out_unlock: 2797 read_unlock(&bond->lock); 2798 if (arp != (struct arphdr *)skb->data) 2799 kfree(arp); 2800 return RX_HANDLER_ANOTHER; 2801 } 2802 2803 /* 2804 * this function is called regularly to monitor each slave's link 2805 * ensuring that traffic is being sent and received when arp monitoring 2806 * is used in load-balancing mode. if the adapter has been dormant, then an 2807 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 2808 * arp monitoring in active backup mode. 2809 */ 2810 void bond_loadbalance_arp_mon(struct work_struct *work) 2811 { 2812 struct bonding *bond = container_of(work, struct bonding, 2813 arp_work.work); 2814 struct slave *slave, *oldcurrent; 2815 int do_failover = 0; 2816 int delta_in_ticks; 2817 int i; 2818 2819 read_lock(&bond->lock); 2820 2821 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2822 2823 if (bond->slave_cnt == 0) 2824 goto re_arm; 2825 2826 read_lock(&bond->curr_slave_lock); 2827 oldcurrent = bond->curr_active_slave; 2828 read_unlock(&bond->curr_slave_lock); 2829 2830 /* see if any of the previous devices are up now (i.e. they have 2831 * xmt and rcv traffic). the curr_active_slave does not come into 2832 * the picture unless it is null. also, slave->jiffies is not needed 2833 * here because we send an arp on each slave and give a slave as 2834 * long as it needs to get the tx/rx within the delta. 2835 * TODO: what about up/down delay in arp mode? it wasn't here before 2836 * so it can wait 2837 */ 2838 bond_for_each_slave(bond, slave, i) { 2839 unsigned long trans_start = dev_trans_start(slave->dev); 2840 2841 if (slave->link != BOND_LINK_UP) { 2842 if (time_in_range(jiffies, 2843 trans_start - delta_in_ticks, 2844 trans_start + delta_in_ticks) && 2845 time_in_range(jiffies, 2846 slave->dev->last_rx - delta_in_ticks, 2847 slave->dev->last_rx + delta_in_ticks)) { 2848 2849 slave->link = BOND_LINK_UP; 2850 bond_set_active_slave(slave); 2851 2852 /* primary_slave has no meaning in round-robin 2853 * mode. the window of a slave being up and 2854 * curr_active_slave being null after enslaving 2855 * is closed. 2856 */ 2857 if (!oldcurrent) { 2858 pr_info("%s: link status definitely up for interface %s, ", 2859 bond->dev->name, 2860 slave->dev->name); 2861 do_failover = 1; 2862 } else { 2863 pr_info("%s: interface %s is now up\n", 2864 bond->dev->name, 2865 slave->dev->name); 2866 } 2867 } 2868 } else { 2869 /* slave->link == BOND_LINK_UP */ 2870 2871 /* not all switches will respond to an arp request 2872 * when the source ip is 0, so don't take the link down 2873 * if we don't know our ip yet 2874 */ 2875 if (!time_in_range(jiffies, 2876 trans_start - delta_in_ticks, 2877 trans_start + 2 * delta_in_ticks) || 2878 !time_in_range(jiffies, 2879 slave->dev->last_rx - delta_in_ticks, 2880 slave->dev->last_rx + 2 * delta_in_ticks)) { 2881 2882 slave->link = BOND_LINK_DOWN; 2883 bond_set_backup_slave(slave); 2884 2885 if (slave->link_failure_count < UINT_MAX) 2886 slave->link_failure_count++; 2887 2888 pr_info("%s: interface %s is now down.\n", 2889 bond->dev->name, 2890 slave->dev->name); 2891 2892 if (slave == oldcurrent) 2893 do_failover = 1; 2894 } 2895 } 2896 2897 /* note: if switch is in round-robin mode, all links 2898 * must tx arp to ensure all links rx an arp - otherwise 2899 * links may oscillate or not come up at all; if switch is 2900 * in something like xor mode, there is nothing we can 2901 * do - all replies will be rx'ed on same link causing slaves 2902 * to be unstable during low/no traffic periods 2903 */ 2904 if (IS_UP(slave->dev)) 2905 bond_arp_send_all(bond, slave); 2906 } 2907 2908 if (do_failover) { 2909 block_netpoll_tx(); 2910 write_lock_bh(&bond->curr_slave_lock); 2911 2912 bond_select_active_slave(bond); 2913 2914 write_unlock_bh(&bond->curr_slave_lock); 2915 unblock_netpoll_tx(); 2916 } 2917 2918 re_arm: 2919 if (bond->params.arp_interval) 2920 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 2921 2922 read_unlock(&bond->lock); 2923 } 2924 2925 /* 2926 * Called to inspect slaves for active-backup mode ARP monitor link state 2927 * changes. Sets new_link in slaves to specify what action should take 2928 * place for the slave. Returns 0 if no changes are found, >0 if changes 2929 * to link states must be committed. 2930 * 2931 * Called with bond->lock held for read. 2932 */ 2933 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks) 2934 { 2935 struct slave *slave; 2936 int i, commit = 0; 2937 unsigned long trans_start; 2938 2939 bond_for_each_slave(bond, slave, i) { 2940 slave->new_link = BOND_LINK_NOCHANGE; 2941 2942 if (slave->link != BOND_LINK_UP) { 2943 if (time_in_range(jiffies, 2944 slave_last_rx(bond, slave) - delta_in_ticks, 2945 slave_last_rx(bond, slave) + delta_in_ticks)) { 2946 2947 slave->new_link = BOND_LINK_UP; 2948 commit++; 2949 } 2950 2951 continue; 2952 } 2953 2954 /* 2955 * Give slaves 2*delta after being enslaved or made 2956 * active. This avoids bouncing, as the last receive 2957 * times need a full ARP monitor cycle to be updated. 2958 */ 2959 if (time_in_range(jiffies, 2960 slave->jiffies - delta_in_ticks, 2961 slave->jiffies + 2 * delta_in_ticks)) 2962 continue; 2963 2964 /* 2965 * Backup slave is down if: 2966 * - No current_arp_slave AND 2967 * - more than 3*delta since last receive AND 2968 * - the bond has an IP address 2969 * 2970 * Note: a non-null current_arp_slave indicates 2971 * the curr_active_slave went down and we are 2972 * searching for a new one; under this condition 2973 * we only take the curr_active_slave down - this 2974 * gives each slave a chance to tx/rx traffic 2975 * before being taken out 2976 */ 2977 if (!bond_is_active_slave(slave) && 2978 !bond->current_arp_slave && 2979 !time_in_range(jiffies, 2980 slave_last_rx(bond, slave) - delta_in_ticks, 2981 slave_last_rx(bond, slave) + 3 * delta_in_ticks)) { 2982 2983 slave->new_link = BOND_LINK_DOWN; 2984 commit++; 2985 } 2986 2987 /* 2988 * Active slave is down if: 2989 * - more than 2*delta since transmitting OR 2990 * - (more than 2*delta since receive AND 2991 * the bond has an IP address) 2992 */ 2993 trans_start = dev_trans_start(slave->dev); 2994 if (bond_is_active_slave(slave) && 2995 (!time_in_range(jiffies, 2996 trans_start - delta_in_ticks, 2997 trans_start + 2 * delta_in_ticks) || 2998 !time_in_range(jiffies, 2999 slave_last_rx(bond, slave) - delta_in_ticks, 3000 slave_last_rx(bond, slave) + 2 * delta_in_ticks))) { 3001 3002 slave->new_link = BOND_LINK_DOWN; 3003 commit++; 3004 } 3005 } 3006 3007 return commit; 3008 } 3009 3010 /* 3011 * Called to commit link state changes noted by inspection step of 3012 * active-backup mode ARP monitor. 3013 * 3014 * Called with RTNL and bond->lock for read. 3015 */ 3016 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks) 3017 { 3018 struct slave *slave; 3019 int i; 3020 unsigned long trans_start; 3021 3022 bond_for_each_slave(bond, slave, i) { 3023 switch (slave->new_link) { 3024 case BOND_LINK_NOCHANGE: 3025 continue; 3026 3027 case BOND_LINK_UP: 3028 trans_start = dev_trans_start(slave->dev); 3029 if ((!bond->curr_active_slave && 3030 time_in_range(jiffies, 3031 trans_start - delta_in_ticks, 3032 trans_start + delta_in_ticks)) || 3033 bond->curr_active_slave != slave) { 3034 slave->link = BOND_LINK_UP; 3035 if (bond->current_arp_slave) { 3036 bond_set_slave_inactive_flags( 3037 bond->current_arp_slave); 3038 bond->current_arp_slave = NULL; 3039 } 3040 3041 pr_info("%s: link status definitely up for interface %s.\n", 3042 bond->dev->name, slave->dev->name); 3043 3044 if (!bond->curr_active_slave || 3045 (slave == bond->primary_slave)) 3046 goto do_failover; 3047 3048 } 3049 3050 continue; 3051 3052 case BOND_LINK_DOWN: 3053 if (slave->link_failure_count < UINT_MAX) 3054 slave->link_failure_count++; 3055 3056 slave->link = BOND_LINK_DOWN; 3057 bond_set_slave_inactive_flags(slave); 3058 3059 pr_info("%s: link status definitely down for interface %s, disabling it\n", 3060 bond->dev->name, slave->dev->name); 3061 3062 if (slave == bond->curr_active_slave) { 3063 bond->current_arp_slave = NULL; 3064 goto do_failover; 3065 } 3066 3067 continue; 3068 3069 default: 3070 pr_err("%s: impossible: new_link %d on slave %s\n", 3071 bond->dev->name, slave->new_link, 3072 slave->dev->name); 3073 continue; 3074 } 3075 3076 do_failover: 3077 ASSERT_RTNL(); 3078 block_netpoll_tx(); 3079 write_lock_bh(&bond->curr_slave_lock); 3080 bond_select_active_slave(bond); 3081 write_unlock_bh(&bond->curr_slave_lock); 3082 unblock_netpoll_tx(); 3083 } 3084 3085 bond_set_carrier(bond); 3086 } 3087 3088 /* 3089 * Send ARP probes for active-backup mode ARP monitor. 3090 * 3091 * Called with bond->lock held for read. 3092 */ 3093 static void bond_ab_arp_probe(struct bonding *bond) 3094 { 3095 struct slave *slave; 3096 int i; 3097 3098 read_lock(&bond->curr_slave_lock); 3099 3100 if (bond->current_arp_slave && bond->curr_active_slave) 3101 pr_info("PROBE: c_arp %s && cas %s BAD\n", 3102 bond->current_arp_slave->dev->name, 3103 bond->curr_active_slave->dev->name); 3104 3105 if (bond->curr_active_slave) { 3106 bond_arp_send_all(bond, bond->curr_active_slave); 3107 read_unlock(&bond->curr_slave_lock); 3108 return; 3109 } 3110 3111 read_unlock(&bond->curr_slave_lock); 3112 3113 /* if we don't have a curr_active_slave, search for the next available 3114 * backup slave from the current_arp_slave and make it the candidate 3115 * for becoming the curr_active_slave 3116 */ 3117 3118 if (!bond->current_arp_slave) { 3119 bond->current_arp_slave = bond->first_slave; 3120 if (!bond->current_arp_slave) 3121 return; 3122 } 3123 3124 bond_set_slave_inactive_flags(bond->current_arp_slave); 3125 3126 /* search for next candidate */ 3127 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) { 3128 if (IS_UP(slave->dev)) { 3129 slave->link = BOND_LINK_BACK; 3130 bond_set_slave_active_flags(slave); 3131 bond_arp_send_all(bond, slave); 3132 slave->jiffies = jiffies; 3133 bond->current_arp_slave = slave; 3134 break; 3135 } 3136 3137 /* if the link state is up at this point, we 3138 * mark it down - this can happen if we have 3139 * simultaneous link failures and 3140 * reselect_active_interface doesn't make this 3141 * one the current slave so it is still marked 3142 * up when it is actually down 3143 */ 3144 if (slave->link == BOND_LINK_UP) { 3145 slave->link = BOND_LINK_DOWN; 3146 if (slave->link_failure_count < UINT_MAX) 3147 slave->link_failure_count++; 3148 3149 bond_set_slave_inactive_flags(slave); 3150 3151 pr_info("%s: backup interface %s is now down.\n", 3152 bond->dev->name, slave->dev->name); 3153 } 3154 } 3155 } 3156 3157 void bond_activebackup_arp_mon(struct work_struct *work) 3158 { 3159 struct bonding *bond = container_of(work, struct bonding, 3160 arp_work.work); 3161 bool should_notify_peers = false; 3162 int delta_in_ticks; 3163 3164 read_lock(&bond->lock); 3165 3166 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3167 3168 if (bond->slave_cnt == 0) 3169 goto re_arm; 3170 3171 should_notify_peers = bond_should_notify_peers(bond); 3172 3173 if (bond_ab_arp_inspect(bond, delta_in_ticks)) { 3174 read_unlock(&bond->lock); 3175 3176 /* Race avoidance with bond_close flush of workqueue */ 3177 if (!rtnl_trylock()) { 3178 read_lock(&bond->lock); 3179 delta_in_ticks = 1; 3180 should_notify_peers = false; 3181 goto re_arm; 3182 } 3183 3184 read_lock(&bond->lock); 3185 3186 bond_ab_arp_commit(bond, delta_in_ticks); 3187 3188 read_unlock(&bond->lock); 3189 rtnl_unlock(); 3190 read_lock(&bond->lock); 3191 } 3192 3193 bond_ab_arp_probe(bond); 3194 3195 re_arm: 3196 if (bond->params.arp_interval) 3197 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 3198 3199 read_unlock(&bond->lock); 3200 3201 if (should_notify_peers) { 3202 if (!rtnl_trylock()) { 3203 read_lock(&bond->lock); 3204 bond->send_peer_notif++; 3205 read_unlock(&bond->lock); 3206 return; 3207 } 3208 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS); 3209 rtnl_unlock(); 3210 } 3211 } 3212 3213 /*-------------------------- netdev event handling --------------------------*/ 3214 3215 /* 3216 * Change device name 3217 */ 3218 static int bond_event_changename(struct bonding *bond) 3219 { 3220 bond_remove_proc_entry(bond); 3221 bond_create_proc_entry(bond); 3222 3223 bond_debug_reregister(bond); 3224 3225 return NOTIFY_DONE; 3226 } 3227 3228 static int bond_master_netdev_event(unsigned long event, 3229 struct net_device *bond_dev) 3230 { 3231 struct bonding *event_bond = netdev_priv(bond_dev); 3232 3233 switch (event) { 3234 case NETDEV_CHANGENAME: 3235 return bond_event_changename(event_bond); 3236 case NETDEV_UNREGISTER: 3237 bond_remove_proc_entry(event_bond); 3238 break; 3239 case NETDEV_REGISTER: 3240 bond_create_proc_entry(event_bond); 3241 break; 3242 default: 3243 break; 3244 } 3245 3246 return NOTIFY_DONE; 3247 } 3248 3249 static int bond_slave_netdev_event(unsigned long event, 3250 struct net_device *slave_dev) 3251 { 3252 struct net_device *bond_dev = slave_dev->master; 3253 struct bonding *bond = netdev_priv(bond_dev); 3254 struct slave *slave = NULL; 3255 3256 switch (event) { 3257 case NETDEV_UNREGISTER: 3258 if (bond_dev) { 3259 if (bond->setup_by_slave) 3260 bond_release_and_destroy(bond_dev, slave_dev); 3261 else 3262 bond_release(bond_dev, slave_dev); 3263 } 3264 break; 3265 case NETDEV_UP: 3266 case NETDEV_CHANGE: 3267 slave = bond_get_slave_by_dev(bond, slave_dev); 3268 if (slave) { 3269 u32 old_speed = slave->speed; 3270 u8 old_duplex = slave->duplex; 3271 3272 bond_update_speed_duplex(slave); 3273 3274 if (bond->params.mode == BOND_MODE_8023AD) { 3275 if (old_speed != slave->speed) 3276 bond_3ad_adapter_speed_changed(slave); 3277 if (old_duplex != slave->duplex) 3278 bond_3ad_adapter_duplex_changed(slave); 3279 } 3280 } 3281 3282 break; 3283 case NETDEV_DOWN: 3284 /* 3285 * ... Or is it this? 3286 */ 3287 break; 3288 case NETDEV_CHANGEMTU: 3289 /* 3290 * TODO: Should slaves be allowed to 3291 * independently alter their MTU? For 3292 * an active-backup bond, slaves need 3293 * not be the same type of device, so 3294 * MTUs may vary. For other modes, 3295 * slaves arguably should have the 3296 * same MTUs. To do this, we'd need to 3297 * take over the slave's change_mtu 3298 * function for the duration of their 3299 * servitude. 3300 */ 3301 break; 3302 case NETDEV_CHANGENAME: 3303 /* 3304 * TODO: handle changing the primary's name 3305 */ 3306 break; 3307 case NETDEV_FEAT_CHANGE: 3308 bond_compute_features(bond); 3309 break; 3310 default: 3311 break; 3312 } 3313 3314 return NOTIFY_DONE; 3315 } 3316 3317 /* 3318 * bond_netdev_event: handle netdev notifier chain events. 3319 * 3320 * This function receives events for the netdev chain. The caller (an 3321 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 3322 * locks for us to safely manipulate the slave devices (RTNL lock, 3323 * dev_probe_lock). 3324 */ 3325 static int bond_netdev_event(struct notifier_block *this, 3326 unsigned long event, void *ptr) 3327 { 3328 struct net_device *event_dev = (struct net_device *)ptr; 3329 3330 pr_debug("event_dev: %s, event: %lx\n", 3331 event_dev ? event_dev->name : "None", 3332 event); 3333 3334 if (!(event_dev->priv_flags & IFF_BONDING)) 3335 return NOTIFY_DONE; 3336 3337 if (event_dev->flags & IFF_MASTER) { 3338 pr_debug("IFF_MASTER\n"); 3339 return bond_master_netdev_event(event, event_dev); 3340 } 3341 3342 if (event_dev->flags & IFF_SLAVE) { 3343 pr_debug("IFF_SLAVE\n"); 3344 return bond_slave_netdev_event(event, event_dev); 3345 } 3346 3347 return NOTIFY_DONE; 3348 } 3349 3350 static struct notifier_block bond_netdev_notifier = { 3351 .notifier_call = bond_netdev_event, 3352 }; 3353 3354 /*---------------------------- Hashing Policies -----------------------------*/ 3355 3356 /* 3357 * Hash for the output device based upon layer 2 and layer 3 data. If 3358 * the packet is not IP mimic bond_xmit_hash_policy_l2() 3359 */ 3360 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count) 3361 { 3362 struct ethhdr *data = (struct ethhdr *)skb->data; 3363 struct iphdr *iph = ip_hdr(skb); 3364 3365 if (skb->protocol == htons(ETH_P_IP)) { 3366 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^ 3367 (data->h_dest[5] ^ data->h_source[5])) % count; 3368 } 3369 3370 return (data->h_dest[5] ^ data->h_source[5]) % count; 3371 } 3372 3373 /* 3374 * Hash for the output device based upon layer 3 and layer 4 data. If 3375 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is 3376 * altogether not IP, mimic bond_xmit_hash_policy_l2() 3377 */ 3378 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count) 3379 { 3380 struct ethhdr *data = (struct ethhdr *)skb->data; 3381 struct iphdr *iph = ip_hdr(skb); 3382 __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl); 3383 int layer4_xor = 0; 3384 3385 if (skb->protocol == htons(ETH_P_IP)) { 3386 if (!ip_is_fragment(iph) && 3387 (iph->protocol == IPPROTO_TCP || 3388 iph->protocol == IPPROTO_UDP)) { 3389 layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1))); 3390 } 3391 return (layer4_xor ^ 3392 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count; 3393 3394 } 3395 3396 return (data->h_dest[5] ^ data->h_source[5]) % count; 3397 } 3398 3399 /* 3400 * Hash for the output device based upon layer 2 data 3401 */ 3402 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count) 3403 { 3404 struct ethhdr *data = (struct ethhdr *)skb->data; 3405 3406 return (data->h_dest[5] ^ data->h_source[5]) % count; 3407 } 3408 3409 /*-------------------------- Device entry points ----------------------------*/ 3410 3411 static int bond_open(struct net_device *bond_dev) 3412 { 3413 struct bonding *bond = netdev_priv(bond_dev); 3414 struct slave *slave; 3415 int i; 3416 3417 /* reset slave->backup and slave->inactive */ 3418 read_lock(&bond->lock); 3419 if (bond->slave_cnt > 0) { 3420 read_lock(&bond->curr_slave_lock); 3421 bond_for_each_slave(bond, slave, i) { 3422 if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) 3423 && (slave != bond->curr_active_slave)) { 3424 bond_set_slave_inactive_flags(slave); 3425 } else { 3426 bond_set_slave_active_flags(slave); 3427 } 3428 } 3429 read_unlock(&bond->curr_slave_lock); 3430 } 3431 read_unlock(&bond->lock); 3432 3433 INIT_DELAYED_WORK(&bond->mcast_work, bond_resend_igmp_join_requests_delayed); 3434 3435 if (bond_is_lb(bond)) { 3436 /* bond_alb_initialize must be called before the timer 3437 * is started. 3438 */ 3439 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) { 3440 /* something went wrong - fail the open operation */ 3441 return -ENOMEM; 3442 } 3443 3444 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 3445 queue_delayed_work(bond->wq, &bond->alb_work, 0); 3446 } 3447 3448 if (bond->params.miimon) { /* link check interval, in milliseconds. */ 3449 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 3450 queue_delayed_work(bond->wq, &bond->mii_work, 0); 3451 } 3452 3453 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 3454 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) 3455 INIT_DELAYED_WORK(&bond->arp_work, 3456 bond_activebackup_arp_mon); 3457 else 3458 INIT_DELAYED_WORK(&bond->arp_work, 3459 bond_loadbalance_arp_mon); 3460 3461 queue_delayed_work(bond->wq, &bond->arp_work, 0); 3462 if (bond->params.arp_validate) 3463 bond->recv_probe = bond_arp_rcv; 3464 } 3465 3466 if (bond->params.mode == BOND_MODE_8023AD) { 3467 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 3468 queue_delayed_work(bond->wq, &bond->ad_work, 0); 3469 /* register to receive LACPDUs */ 3470 bond->recv_probe = bond_3ad_lacpdu_recv; 3471 bond_3ad_initiate_agg_selection(bond, 1); 3472 } 3473 3474 return 0; 3475 } 3476 3477 static int bond_close(struct net_device *bond_dev) 3478 { 3479 struct bonding *bond = netdev_priv(bond_dev); 3480 3481 write_lock_bh(&bond->lock); 3482 3483 bond->send_peer_notif = 0; 3484 3485 write_unlock_bh(&bond->lock); 3486 3487 if (bond->params.miimon) { /* link check interval, in milliseconds. */ 3488 cancel_delayed_work_sync(&bond->mii_work); 3489 } 3490 3491 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 3492 cancel_delayed_work_sync(&bond->arp_work); 3493 } 3494 3495 switch (bond->params.mode) { 3496 case BOND_MODE_8023AD: 3497 cancel_delayed_work_sync(&bond->ad_work); 3498 break; 3499 case BOND_MODE_TLB: 3500 case BOND_MODE_ALB: 3501 cancel_delayed_work_sync(&bond->alb_work); 3502 break; 3503 default: 3504 break; 3505 } 3506 3507 if (delayed_work_pending(&bond->mcast_work)) 3508 cancel_delayed_work_sync(&bond->mcast_work); 3509 3510 if (bond_is_lb(bond)) { 3511 /* Must be called only after all 3512 * slaves have been released 3513 */ 3514 bond_alb_deinitialize(bond); 3515 } 3516 bond->recv_probe = NULL; 3517 3518 return 0; 3519 } 3520 3521 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev, 3522 struct rtnl_link_stats64 *stats) 3523 { 3524 struct bonding *bond = netdev_priv(bond_dev); 3525 struct rtnl_link_stats64 temp; 3526 struct slave *slave; 3527 int i; 3528 3529 memset(stats, 0, sizeof(*stats)); 3530 3531 read_lock_bh(&bond->lock); 3532 3533 bond_for_each_slave(bond, slave, i) { 3534 const struct rtnl_link_stats64 *sstats = 3535 dev_get_stats(slave->dev, &temp); 3536 3537 stats->rx_packets += sstats->rx_packets; 3538 stats->rx_bytes += sstats->rx_bytes; 3539 stats->rx_errors += sstats->rx_errors; 3540 stats->rx_dropped += sstats->rx_dropped; 3541 3542 stats->tx_packets += sstats->tx_packets; 3543 stats->tx_bytes += sstats->tx_bytes; 3544 stats->tx_errors += sstats->tx_errors; 3545 stats->tx_dropped += sstats->tx_dropped; 3546 3547 stats->multicast += sstats->multicast; 3548 stats->collisions += sstats->collisions; 3549 3550 stats->rx_length_errors += sstats->rx_length_errors; 3551 stats->rx_over_errors += sstats->rx_over_errors; 3552 stats->rx_crc_errors += sstats->rx_crc_errors; 3553 stats->rx_frame_errors += sstats->rx_frame_errors; 3554 stats->rx_fifo_errors += sstats->rx_fifo_errors; 3555 stats->rx_missed_errors += sstats->rx_missed_errors; 3556 3557 stats->tx_aborted_errors += sstats->tx_aborted_errors; 3558 stats->tx_carrier_errors += sstats->tx_carrier_errors; 3559 stats->tx_fifo_errors += sstats->tx_fifo_errors; 3560 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors; 3561 stats->tx_window_errors += sstats->tx_window_errors; 3562 } 3563 3564 read_unlock_bh(&bond->lock); 3565 3566 return stats; 3567 } 3568 3569 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 3570 { 3571 struct net_device *slave_dev = NULL; 3572 struct ifbond k_binfo; 3573 struct ifbond __user *u_binfo = NULL; 3574 struct ifslave k_sinfo; 3575 struct ifslave __user *u_sinfo = NULL; 3576 struct mii_ioctl_data *mii = NULL; 3577 int res = 0; 3578 3579 pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd); 3580 3581 switch (cmd) { 3582 case SIOCGMIIPHY: 3583 mii = if_mii(ifr); 3584 if (!mii) 3585 return -EINVAL; 3586 3587 mii->phy_id = 0; 3588 /* Fall Through */ 3589 case SIOCGMIIREG: 3590 /* 3591 * We do this again just in case we were called by SIOCGMIIREG 3592 * instead of SIOCGMIIPHY. 3593 */ 3594 mii = if_mii(ifr); 3595 if (!mii) 3596 return -EINVAL; 3597 3598 3599 if (mii->reg_num == 1) { 3600 struct bonding *bond = netdev_priv(bond_dev); 3601 mii->val_out = 0; 3602 read_lock(&bond->lock); 3603 read_lock(&bond->curr_slave_lock); 3604 if (netif_carrier_ok(bond->dev)) 3605 mii->val_out = BMSR_LSTATUS; 3606 3607 read_unlock(&bond->curr_slave_lock); 3608 read_unlock(&bond->lock); 3609 } 3610 3611 return 0; 3612 case BOND_INFO_QUERY_OLD: 3613 case SIOCBONDINFOQUERY: 3614 u_binfo = (struct ifbond __user *)ifr->ifr_data; 3615 3616 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 3617 return -EFAULT; 3618 3619 res = bond_info_query(bond_dev, &k_binfo); 3620 if (res == 0 && 3621 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 3622 return -EFAULT; 3623 3624 return res; 3625 case BOND_SLAVE_INFO_QUERY_OLD: 3626 case SIOCBONDSLAVEINFOQUERY: 3627 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 3628 3629 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 3630 return -EFAULT; 3631 3632 res = bond_slave_info_query(bond_dev, &k_sinfo); 3633 if (res == 0 && 3634 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 3635 return -EFAULT; 3636 3637 return res; 3638 default: 3639 /* Go on */ 3640 break; 3641 } 3642 3643 if (!capable(CAP_NET_ADMIN)) 3644 return -EPERM; 3645 3646 slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave); 3647 3648 pr_debug("slave_dev=%p:\n", slave_dev); 3649 3650 if (!slave_dev) 3651 res = -ENODEV; 3652 else { 3653 pr_debug("slave_dev->name=%s:\n", slave_dev->name); 3654 switch (cmd) { 3655 case BOND_ENSLAVE_OLD: 3656 case SIOCBONDENSLAVE: 3657 res = bond_enslave(bond_dev, slave_dev); 3658 break; 3659 case BOND_RELEASE_OLD: 3660 case SIOCBONDRELEASE: 3661 res = bond_release(bond_dev, slave_dev); 3662 break; 3663 case BOND_SETHWADDR_OLD: 3664 case SIOCBONDSETHWADDR: 3665 res = bond_sethwaddr(bond_dev, slave_dev); 3666 break; 3667 case BOND_CHANGE_ACTIVE_OLD: 3668 case SIOCBONDCHANGEACTIVE: 3669 res = bond_ioctl_change_active(bond_dev, slave_dev); 3670 break; 3671 default: 3672 res = -EOPNOTSUPP; 3673 } 3674 3675 dev_put(slave_dev); 3676 } 3677 3678 return res; 3679 } 3680 3681 static bool bond_addr_in_mc_list(unsigned char *addr, 3682 struct netdev_hw_addr_list *list, 3683 int addrlen) 3684 { 3685 struct netdev_hw_addr *ha; 3686 3687 netdev_hw_addr_list_for_each(ha, list) 3688 if (!memcmp(ha->addr, addr, addrlen)) 3689 return true; 3690 3691 return false; 3692 } 3693 3694 static void bond_change_rx_flags(struct net_device *bond_dev, int change) 3695 { 3696 struct bonding *bond = netdev_priv(bond_dev); 3697 3698 if (change & IFF_PROMISC) 3699 bond_set_promiscuity(bond, 3700 bond_dev->flags & IFF_PROMISC ? 1 : -1); 3701 3702 if (change & IFF_ALLMULTI) 3703 bond_set_allmulti(bond, 3704 bond_dev->flags & IFF_ALLMULTI ? 1 : -1); 3705 } 3706 3707 static void bond_set_multicast_list(struct net_device *bond_dev) 3708 { 3709 struct bonding *bond = netdev_priv(bond_dev); 3710 struct netdev_hw_addr *ha; 3711 bool found; 3712 3713 read_lock(&bond->lock); 3714 3715 /* looking for addresses to add to slaves' mc list */ 3716 netdev_for_each_mc_addr(ha, bond_dev) { 3717 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list, 3718 bond_dev->addr_len); 3719 if (!found) 3720 bond_mc_add(bond, ha->addr); 3721 } 3722 3723 /* looking for addresses to delete from slaves' list */ 3724 netdev_hw_addr_list_for_each(ha, &bond->mc_list) { 3725 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc, 3726 bond_dev->addr_len); 3727 if (!found) 3728 bond_mc_del(bond, ha->addr); 3729 } 3730 3731 /* save master's multicast list */ 3732 __hw_addr_flush(&bond->mc_list); 3733 __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc, 3734 bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST); 3735 3736 read_unlock(&bond->lock); 3737 } 3738 3739 static int bond_neigh_init(struct neighbour *n) 3740 { 3741 struct bonding *bond = netdev_priv(n->dev); 3742 struct slave *slave = bond->first_slave; 3743 const struct net_device_ops *slave_ops; 3744 struct neigh_parms parms; 3745 int ret; 3746 3747 if (!slave) 3748 return 0; 3749 3750 slave_ops = slave->dev->netdev_ops; 3751 3752 if (!slave_ops->ndo_neigh_setup) 3753 return 0; 3754 3755 parms.neigh_setup = NULL; 3756 parms.neigh_cleanup = NULL; 3757 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); 3758 if (ret) 3759 return ret; 3760 3761 /* 3762 * Assign slave's neigh_cleanup to neighbour in case cleanup is called 3763 * after the last slave has been detached. Assumes that all slaves 3764 * utilize the same neigh_cleanup (true at this writing as only user 3765 * is ipoib). 3766 */ 3767 n->parms->neigh_cleanup = parms.neigh_cleanup; 3768 3769 if (!parms.neigh_setup) 3770 return 0; 3771 3772 return parms.neigh_setup(n); 3773 } 3774 3775 /* 3776 * The bonding ndo_neigh_setup is called at init time beofre any 3777 * slave exists. So we must declare proxy setup function which will 3778 * be used at run time to resolve the actual slave neigh param setup. 3779 */ 3780 static int bond_neigh_setup(struct net_device *dev, 3781 struct neigh_parms *parms) 3782 { 3783 parms->neigh_setup = bond_neigh_init; 3784 3785 return 0; 3786 } 3787 3788 /* 3789 * Change the MTU of all of a master's slaves to match the master 3790 */ 3791 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 3792 { 3793 struct bonding *bond = netdev_priv(bond_dev); 3794 struct slave *slave, *stop_at; 3795 int res = 0; 3796 int i; 3797 3798 pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond, 3799 (bond_dev ? bond_dev->name : "None"), new_mtu); 3800 3801 /* Can't hold bond->lock with bh disabled here since 3802 * some base drivers panic. On the other hand we can't 3803 * hold bond->lock without bh disabled because we'll 3804 * deadlock. The only solution is to rely on the fact 3805 * that we're under rtnl_lock here, and the slaves 3806 * list won't change. This doesn't solve the problem 3807 * of setting the slave's MTU while it is 3808 * transmitting, but the assumption is that the base 3809 * driver can handle that. 3810 * 3811 * TODO: figure out a way to safely iterate the slaves 3812 * list, but without holding a lock around the actual 3813 * call to the base driver. 3814 */ 3815 3816 bond_for_each_slave(bond, slave, i) { 3817 pr_debug("s %p s->p %p c_m %p\n", 3818 slave, 3819 slave->prev, 3820 slave->dev->netdev_ops->ndo_change_mtu); 3821 3822 res = dev_set_mtu(slave->dev, new_mtu); 3823 3824 if (res) { 3825 /* If we failed to set the slave's mtu to the new value 3826 * we must abort the operation even in ACTIVE_BACKUP 3827 * mode, because if we allow the backup slaves to have 3828 * different mtu values than the active slave we'll 3829 * need to change their mtu when doing a failover. That 3830 * means changing their mtu from timer context, which 3831 * is probably not a good idea. 3832 */ 3833 pr_debug("err %d %s\n", res, slave->dev->name); 3834 goto unwind; 3835 } 3836 } 3837 3838 bond_dev->mtu = new_mtu; 3839 3840 return 0; 3841 3842 unwind: 3843 /* unwind from head to the slave that failed */ 3844 stop_at = slave; 3845 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { 3846 int tmp_res; 3847 3848 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu); 3849 if (tmp_res) { 3850 pr_debug("unwind err %d dev %s\n", 3851 tmp_res, slave->dev->name); 3852 } 3853 } 3854 3855 return res; 3856 } 3857 3858 /* 3859 * Change HW address 3860 * 3861 * Note that many devices must be down to change the HW address, and 3862 * downing the master releases all slaves. We can make bonds full of 3863 * bonding devices to test this, however. 3864 */ 3865 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 3866 { 3867 struct bonding *bond = netdev_priv(bond_dev); 3868 struct sockaddr *sa = addr, tmp_sa; 3869 struct slave *slave, *stop_at; 3870 int res = 0; 3871 int i; 3872 3873 if (bond->params.mode == BOND_MODE_ALB) 3874 return bond_alb_set_mac_address(bond_dev, addr); 3875 3876 3877 pr_debug("bond=%p, name=%s\n", 3878 bond, bond_dev ? bond_dev->name : "None"); 3879 3880 /* 3881 * If fail_over_mac is set to active, do nothing and return 3882 * success. Returning an error causes ifenslave to fail. 3883 */ 3884 if (bond->params.fail_over_mac == BOND_FOM_ACTIVE) 3885 return 0; 3886 3887 if (!is_valid_ether_addr(sa->sa_data)) 3888 return -EADDRNOTAVAIL; 3889 3890 /* Can't hold bond->lock with bh disabled here since 3891 * some base drivers panic. On the other hand we can't 3892 * hold bond->lock without bh disabled because we'll 3893 * deadlock. The only solution is to rely on the fact 3894 * that we're under rtnl_lock here, and the slaves 3895 * list won't change. This doesn't solve the problem 3896 * of setting the slave's hw address while it is 3897 * transmitting, but the assumption is that the base 3898 * driver can handle that. 3899 * 3900 * TODO: figure out a way to safely iterate the slaves 3901 * list, but without holding a lock around the actual 3902 * call to the base driver. 3903 */ 3904 3905 bond_for_each_slave(bond, slave, i) { 3906 const struct net_device_ops *slave_ops = slave->dev->netdev_ops; 3907 pr_debug("slave %p %s\n", slave, slave->dev->name); 3908 3909 if (slave_ops->ndo_set_mac_address == NULL) { 3910 res = -EOPNOTSUPP; 3911 pr_debug("EOPNOTSUPP %s\n", slave->dev->name); 3912 goto unwind; 3913 } 3914 3915 res = dev_set_mac_address(slave->dev, addr); 3916 if (res) { 3917 /* TODO: consider downing the slave 3918 * and retry ? 3919 * User should expect communications 3920 * breakage anyway until ARP finish 3921 * updating, so... 3922 */ 3923 pr_debug("err %d %s\n", res, slave->dev->name); 3924 goto unwind; 3925 } 3926 } 3927 3928 /* success */ 3929 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); 3930 return 0; 3931 3932 unwind: 3933 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 3934 tmp_sa.sa_family = bond_dev->type; 3935 3936 /* unwind from head to the slave that failed */ 3937 stop_at = slave; 3938 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { 3939 int tmp_res; 3940 3941 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa); 3942 if (tmp_res) { 3943 pr_debug("unwind err %d dev %s\n", 3944 tmp_res, slave->dev->name); 3945 } 3946 } 3947 3948 return res; 3949 } 3950 3951 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev) 3952 { 3953 struct bonding *bond = netdev_priv(bond_dev); 3954 struct slave *slave, *start_at; 3955 int i, slave_no, res = 1; 3956 struct iphdr *iph = ip_hdr(skb); 3957 3958 /* 3959 * Start with the curr_active_slave that joined the bond as the 3960 * default for sending IGMP traffic. For failover purposes one 3961 * needs to maintain some consistency for the interface that will 3962 * send the join/membership reports. The curr_active_slave found 3963 * will send all of this type of traffic. 3964 */ 3965 if ((iph->protocol == IPPROTO_IGMP) && 3966 (skb->protocol == htons(ETH_P_IP))) { 3967 3968 read_lock(&bond->curr_slave_lock); 3969 slave = bond->curr_active_slave; 3970 read_unlock(&bond->curr_slave_lock); 3971 3972 if (!slave) 3973 goto out; 3974 } else { 3975 /* 3976 * Concurrent TX may collide on rr_tx_counter; we accept 3977 * that as being rare enough not to justify using an 3978 * atomic op here. 3979 */ 3980 slave_no = bond->rr_tx_counter++ % bond->slave_cnt; 3981 3982 bond_for_each_slave(bond, slave, i) { 3983 slave_no--; 3984 if (slave_no < 0) 3985 break; 3986 } 3987 } 3988 3989 start_at = slave; 3990 bond_for_each_slave_from(bond, slave, i, start_at) { 3991 if (IS_UP(slave->dev) && 3992 (slave->link == BOND_LINK_UP) && 3993 bond_is_active_slave(slave)) { 3994 res = bond_dev_queue_xmit(bond, skb, slave->dev); 3995 break; 3996 } 3997 } 3998 3999 out: 4000 if (res) { 4001 /* no suitable interface, frame not sent */ 4002 kfree_skb(skb); 4003 } 4004 4005 return NETDEV_TX_OK; 4006 } 4007 4008 4009 /* 4010 * in active-backup mode, we know that bond->curr_active_slave is always valid if 4011 * the bond has a usable interface. 4012 */ 4013 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev) 4014 { 4015 struct bonding *bond = netdev_priv(bond_dev); 4016 int res = 1; 4017 4018 read_lock(&bond->curr_slave_lock); 4019 4020 if (bond->curr_active_slave) 4021 res = bond_dev_queue_xmit(bond, skb, 4022 bond->curr_active_slave->dev); 4023 4024 read_unlock(&bond->curr_slave_lock); 4025 4026 if (res) 4027 /* no suitable interface, frame not sent */ 4028 kfree_skb(skb); 4029 4030 return NETDEV_TX_OK; 4031 } 4032 4033 /* 4034 * In bond_xmit_xor() , we determine the output device by using a pre- 4035 * determined xmit_hash_policy(), If the selected device is not enabled, 4036 * find the next active slave. 4037 */ 4038 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev) 4039 { 4040 struct bonding *bond = netdev_priv(bond_dev); 4041 struct slave *slave, *start_at; 4042 int slave_no; 4043 int i; 4044 int res = 1; 4045 4046 slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt); 4047 4048 bond_for_each_slave(bond, slave, i) { 4049 slave_no--; 4050 if (slave_no < 0) 4051 break; 4052 } 4053 4054 start_at = slave; 4055 4056 bond_for_each_slave_from(bond, slave, i, start_at) { 4057 if (IS_UP(slave->dev) && 4058 (slave->link == BOND_LINK_UP) && 4059 bond_is_active_slave(slave)) { 4060 res = bond_dev_queue_xmit(bond, skb, slave->dev); 4061 break; 4062 } 4063 } 4064 4065 if (res) { 4066 /* no suitable interface, frame not sent */ 4067 kfree_skb(skb); 4068 } 4069 4070 return NETDEV_TX_OK; 4071 } 4072 4073 /* 4074 * in broadcast mode, we send everything to all usable interfaces. 4075 */ 4076 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev) 4077 { 4078 struct bonding *bond = netdev_priv(bond_dev); 4079 struct slave *slave, *start_at; 4080 struct net_device *tx_dev = NULL; 4081 int i; 4082 int res = 1; 4083 4084 read_lock(&bond->curr_slave_lock); 4085 start_at = bond->curr_active_slave; 4086 read_unlock(&bond->curr_slave_lock); 4087 4088 if (!start_at) 4089 goto out; 4090 4091 bond_for_each_slave_from(bond, slave, i, start_at) { 4092 if (IS_UP(slave->dev) && 4093 (slave->link == BOND_LINK_UP) && 4094 bond_is_active_slave(slave)) { 4095 if (tx_dev) { 4096 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 4097 if (!skb2) { 4098 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n", 4099 bond_dev->name); 4100 continue; 4101 } 4102 4103 res = bond_dev_queue_xmit(bond, skb2, tx_dev); 4104 if (res) { 4105 kfree_skb(skb2); 4106 continue; 4107 } 4108 } 4109 tx_dev = slave->dev; 4110 } 4111 } 4112 4113 if (tx_dev) 4114 res = bond_dev_queue_xmit(bond, skb, tx_dev); 4115 4116 out: 4117 if (res) 4118 /* no suitable interface, frame not sent */ 4119 kfree_skb(skb); 4120 4121 /* frame sent to all suitable interfaces */ 4122 return NETDEV_TX_OK; 4123 } 4124 4125 /*------------------------- Device initialization ---------------------------*/ 4126 4127 static void bond_set_xmit_hash_policy(struct bonding *bond) 4128 { 4129 switch (bond->params.xmit_policy) { 4130 case BOND_XMIT_POLICY_LAYER23: 4131 bond->xmit_hash_policy = bond_xmit_hash_policy_l23; 4132 break; 4133 case BOND_XMIT_POLICY_LAYER34: 4134 bond->xmit_hash_policy = bond_xmit_hash_policy_l34; 4135 break; 4136 case BOND_XMIT_POLICY_LAYER2: 4137 default: 4138 bond->xmit_hash_policy = bond_xmit_hash_policy_l2; 4139 break; 4140 } 4141 } 4142 4143 /* 4144 * Lookup the slave that corresponds to a qid 4145 */ 4146 static inline int bond_slave_override(struct bonding *bond, 4147 struct sk_buff *skb) 4148 { 4149 int i, res = 1; 4150 struct slave *slave = NULL; 4151 struct slave *check_slave; 4152 4153 if (!skb->queue_mapping) 4154 return 1; 4155 4156 /* Find out if any slaves have the same mapping as this skb. */ 4157 bond_for_each_slave(bond, check_slave, i) { 4158 if (check_slave->queue_id == skb->queue_mapping) { 4159 slave = check_slave; 4160 break; 4161 } 4162 } 4163 4164 /* If the slave isn't UP, use default transmit policy. */ 4165 if (slave && slave->queue_id && IS_UP(slave->dev) && 4166 (slave->link == BOND_LINK_UP)) { 4167 res = bond_dev_queue_xmit(bond, skb, slave->dev); 4168 } 4169 4170 return res; 4171 } 4172 4173 4174 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb) 4175 { 4176 /* 4177 * This helper function exists to help dev_pick_tx get the correct 4178 * destination queue. Using a helper function skips a call to 4179 * skb_tx_hash and will put the skbs in the queue we expect on their 4180 * way down to the bonding driver. 4181 */ 4182 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 4183 4184 /* 4185 * Save the original txq to restore before passing to the driver 4186 */ 4187 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping; 4188 4189 if (unlikely(txq >= dev->real_num_tx_queues)) { 4190 do { 4191 txq -= dev->real_num_tx_queues; 4192 } while (txq >= dev->real_num_tx_queues); 4193 } 4194 return txq; 4195 } 4196 4197 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4198 { 4199 struct bonding *bond = netdev_priv(dev); 4200 4201 if (TX_QUEUE_OVERRIDE(bond->params.mode)) { 4202 if (!bond_slave_override(bond, skb)) 4203 return NETDEV_TX_OK; 4204 } 4205 4206 switch (bond->params.mode) { 4207 case BOND_MODE_ROUNDROBIN: 4208 return bond_xmit_roundrobin(skb, dev); 4209 case BOND_MODE_ACTIVEBACKUP: 4210 return bond_xmit_activebackup(skb, dev); 4211 case BOND_MODE_XOR: 4212 return bond_xmit_xor(skb, dev); 4213 case BOND_MODE_BROADCAST: 4214 return bond_xmit_broadcast(skb, dev); 4215 case BOND_MODE_8023AD: 4216 return bond_3ad_xmit_xor(skb, dev); 4217 case BOND_MODE_ALB: 4218 case BOND_MODE_TLB: 4219 return bond_alb_xmit(skb, dev); 4220 default: 4221 /* Should never happen, mode already checked */ 4222 pr_err("%s: Error: Unknown bonding mode %d\n", 4223 dev->name, bond->params.mode); 4224 WARN_ON_ONCE(1); 4225 kfree_skb(skb); 4226 return NETDEV_TX_OK; 4227 } 4228 } 4229 4230 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4231 { 4232 struct bonding *bond = netdev_priv(dev); 4233 netdev_tx_t ret = NETDEV_TX_OK; 4234 4235 /* 4236 * If we risk deadlock from transmitting this in the 4237 * netpoll path, tell netpoll to queue the frame for later tx 4238 */ 4239 if (is_netpoll_tx_blocked(dev)) 4240 return NETDEV_TX_BUSY; 4241 4242 read_lock(&bond->lock); 4243 4244 if (bond->slave_cnt) 4245 ret = __bond_start_xmit(skb, dev); 4246 else 4247 kfree_skb(skb); 4248 4249 read_unlock(&bond->lock); 4250 4251 return ret; 4252 } 4253 4254 /* 4255 * set bond mode specific net device operations 4256 */ 4257 void bond_set_mode_ops(struct bonding *bond, int mode) 4258 { 4259 struct net_device *bond_dev = bond->dev; 4260 4261 switch (mode) { 4262 case BOND_MODE_ROUNDROBIN: 4263 break; 4264 case BOND_MODE_ACTIVEBACKUP: 4265 break; 4266 case BOND_MODE_XOR: 4267 bond_set_xmit_hash_policy(bond); 4268 break; 4269 case BOND_MODE_BROADCAST: 4270 break; 4271 case BOND_MODE_8023AD: 4272 bond_set_xmit_hash_policy(bond); 4273 break; 4274 case BOND_MODE_ALB: 4275 /* FALLTHRU */ 4276 case BOND_MODE_TLB: 4277 break; 4278 default: 4279 /* Should never happen, mode already checked */ 4280 pr_err("%s: Error: Unknown bonding mode %d\n", 4281 bond_dev->name, mode); 4282 break; 4283 } 4284 } 4285 4286 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 4287 struct ethtool_drvinfo *drvinfo) 4288 { 4289 strncpy(drvinfo->driver, DRV_NAME, 32); 4290 strncpy(drvinfo->version, DRV_VERSION, 32); 4291 snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION); 4292 } 4293 4294 static const struct ethtool_ops bond_ethtool_ops = { 4295 .get_drvinfo = bond_ethtool_get_drvinfo, 4296 .get_link = ethtool_op_get_link, 4297 }; 4298 4299 static const struct net_device_ops bond_netdev_ops = { 4300 .ndo_init = bond_init, 4301 .ndo_uninit = bond_uninit, 4302 .ndo_open = bond_open, 4303 .ndo_stop = bond_close, 4304 .ndo_start_xmit = bond_start_xmit, 4305 .ndo_select_queue = bond_select_queue, 4306 .ndo_get_stats64 = bond_get_stats, 4307 .ndo_do_ioctl = bond_do_ioctl, 4308 .ndo_change_rx_flags = bond_change_rx_flags, 4309 .ndo_set_rx_mode = bond_set_multicast_list, 4310 .ndo_change_mtu = bond_change_mtu, 4311 .ndo_set_mac_address = bond_set_mac_address, 4312 .ndo_neigh_setup = bond_neigh_setup, 4313 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 4314 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 4315 #ifdef CONFIG_NET_POLL_CONTROLLER 4316 .ndo_netpoll_setup = bond_netpoll_setup, 4317 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 4318 .ndo_poll_controller = bond_poll_controller, 4319 #endif 4320 .ndo_add_slave = bond_enslave, 4321 .ndo_del_slave = bond_release, 4322 .ndo_fix_features = bond_fix_features, 4323 }; 4324 4325 static void bond_destructor(struct net_device *bond_dev) 4326 { 4327 struct bonding *bond = netdev_priv(bond_dev); 4328 if (bond->wq) 4329 destroy_workqueue(bond->wq); 4330 free_netdev(bond_dev); 4331 } 4332 4333 static void bond_setup(struct net_device *bond_dev) 4334 { 4335 struct bonding *bond = netdev_priv(bond_dev); 4336 4337 /* initialize rwlocks */ 4338 rwlock_init(&bond->lock); 4339 rwlock_init(&bond->curr_slave_lock); 4340 4341 bond->params = bonding_defaults; 4342 4343 /* Initialize pointers */ 4344 bond->dev = bond_dev; 4345 INIT_LIST_HEAD(&bond->vlan_list); 4346 4347 /* Initialize the device entry points */ 4348 ether_setup(bond_dev); 4349 bond_dev->netdev_ops = &bond_netdev_ops; 4350 bond_dev->ethtool_ops = &bond_ethtool_ops; 4351 bond_set_mode_ops(bond, bond->params.mode); 4352 4353 bond_dev->destructor = bond_destructor; 4354 4355 /* Initialize the device options */ 4356 bond_dev->tx_queue_len = 0; 4357 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST; 4358 bond_dev->priv_flags |= IFF_BONDING; 4359 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 4360 4361 /* At first, we block adding VLANs. That's the only way to 4362 * prevent problems that occur when adding VLANs over an 4363 * empty bond. The block will be removed once non-challenged 4364 * slaves are enslaved. 4365 */ 4366 bond_dev->features |= NETIF_F_VLAN_CHALLENGED; 4367 4368 /* don't acquire bond device's netif_tx_lock when 4369 * transmitting */ 4370 bond_dev->features |= NETIF_F_LLTX; 4371 4372 /* By default, we declare the bond to be fully 4373 * VLAN hardware accelerated capable. Special 4374 * care is taken in the various xmit functions 4375 * when there are slaves that are not hw accel 4376 * capable 4377 */ 4378 4379 bond_dev->hw_features = BOND_VLAN_FEATURES | 4380 NETIF_F_HW_VLAN_TX | 4381 NETIF_F_HW_VLAN_RX | 4382 NETIF_F_HW_VLAN_FILTER; 4383 4384 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM); 4385 bond_dev->features |= bond_dev->hw_features; 4386 } 4387 4388 static void bond_work_cancel_all(struct bonding *bond) 4389 { 4390 if (bond->params.miimon && delayed_work_pending(&bond->mii_work)) 4391 cancel_delayed_work_sync(&bond->mii_work); 4392 4393 if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work)) 4394 cancel_delayed_work_sync(&bond->arp_work); 4395 4396 if (bond->params.mode == BOND_MODE_ALB && 4397 delayed_work_pending(&bond->alb_work)) 4398 cancel_delayed_work_sync(&bond->alb_work); 4399 4400 if (bond->params.mode == BOND_MODE_8023AD && 4401 delayed_work_pending(&bond->ad_work)) 4402 cancel_delayed_work_sync(&bond->ad_work); 4403 4404 if (delayed_work_pending(&bond->mcast_work)) 4405 cancel_delayed_work_sync(&bond->mcast_work); 4406 } 4407 4408 /* 4409 * Destroy a bonding device. 4410 * Must be under rtnl_lock when this function is called. 4411 */ 4412 static void bond_uninit(struct net_device *bond_dev) 4413 { 4414 struct bonding *bond = netdev_priv(bond_dev); 4415 struct vlan_entry *vlan, *tmp; 4416 4417 bond_netpoll_cleanup(bond_dev); 4418 4419 /* Release the bonded slaves */ 4420 bond_release_all(bond_dev); 4421 4422 list_del(&bond->bond_list); 4423 4424 bond_work_cancel_all(bond); 4425 4426 bond_debug_unregister(bond); 4427 4428 __hw_addr_flush(&bond->mc_list); 4429 4430 list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) { 4431 list_del(&vlan->vlan_list); 4432 kfree(vlan); 4433 } 4434 } 4435 4436 /*------------------------- Module initialization ---------------------------*/ 4437 4438 /* 4439 * Convert string input module parms. Accept either the 4440 * number of the mode or its string name. A bit complicated because 4441 * some mode names are substrings of other names, and calls from sysfs 4442 * may have whitespace in the name (trailing newlines, for example). 4443 */ 4444 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl) 4445 { 4446 int modeint = -1, i, rv; 4447 char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, }; 4448 4449 for (p = (char *)buf; *p; p++) 4450 if (!(isdigit(*p) || isspace(*p))) 4451 break; 4452 4453 if (*p) 4454 rv = sscanf(buf, "%20s", modestr); 4455 else 4456 rv = sscanf(buf, "%d", &modeint); 4457 4458 if (!rv) 4459 return -1; 4460 4461 for (i = 0; tbl[i].modename; i++) { 4462 if (modeint == tbl[i].mode) 4463 return tbl[i].mode; 4464 if (strcmp(modestr, tbl[i].modename) == 0) 4465 return tbl[i].mode; 4466 } 4467 4468 return -1; 4469 } 4470 4471 static int bond_check_params(struct bond_params *params) 4472 { 4473 int arp_validate_value, fail_over_mac_value, primary_reselect_value; 4474 4475 /* 4476 * Convert string parameters. 4477 */ 4478 if (mode) { 4479 bond_mode = bond_parse_parm(mode, bond_mode_tbl); 4480 if (bond_mode == -1) { 4481 pr_err("Error: Invalid bonding mode \"%s\"\n", 4482 mode == NULL ? "NULL" : mode); 4483 return -EINVAL; 4484 } 4485 } 4486 4487 if (xmit_hash_policy) { 4488 if ((bond_mode != BOND_MODE_XOR) && 4489 (bond_mode != BOND_MODE_8023AD)) { 4490 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 4491 bond_mode_name(bond_mode)); 4492 } else { 4493 xmit_hashtype = bond_parse_parm(xmit_hash_policy, 4494 xmit_hashtype_tbl); 4495 if (xmit_hashtype == -1) { 4496 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 4497 xmit_hash_policy == NULL ? "NULL" : 4498 xmit_hash_policy); 4499 return -EINVAL; 4500 } 4501 } 4502 } 4503 4504 if (lacp_rate) { 4505 if (bond_mode != BOND_MODE_8023AD) { 4506 pr_info("lacp_rate param is irrelevant in mode %s\n", 4507 bond_mode_name(bond_mode)); 4508 } else { 4509 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl); 4510 if (lacp_fast == -1) { 4511 pr_err("Error: Invalid lacp rate \"%s\"\n", 4512 lacp_rate == NULL ? "NULL" : lacp_rate); 4513 return -EINVAL; 4514 } 4515 } 4516 } 4517 4518 if (ad_select) { 4519 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl); 4520 if (params->ad_select == -1) { 4521 pr_err("Error: Invalid ad_select \"%s\"\n", 4522 ad_select == NULL ? "NULL" : ad_select); 4523 return -EINVAL; 4524 } 4525 4526 if (bond_mode != BOND_MODE_8023AD) { 4527 pr_warning("ad_select param only affects 802.3ad mode\n"); 4528 } 4529 } else { 4530 params->ad_select = BOND_AD_STABLE; 4531 } 4532 4533 if (max_bonds < 0) { 4534 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 4535 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 4536 max_bonds = BOND_DEFAULT_MAX_BONDS; 4537 } 4538 4539 if (miimon < 0) { 4540 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n", 4541 miimon, INT_MAX, BOND_LINK_MON_INTERV); 4542 miimon = BOND_LINK_MON_INTERV; 4543 } 4544 4545 if (updelay < 0) { 4546 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4547 updelay, INT_MAX); 4548 updelay = 0; 4549 } 4550 4551 if (downdelay < 0) { 4552 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4553 downdelay, INT_MAX); 4554 downdelay = 0; 4555 } 4556 4557 if ((use_carrier != 0) && (use_carrier != 1)) { 4558 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 4559 use_carrier); 4560 use_carrier = 1; 4561 } 4562 4563 if (num_peer_notif < 0 || num_peer_notif > 255) { 4564 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 4565 num_peer_notif); 4566 num_peer_notif = 1; 4567 } 4568 4569 /* reset values for 802.3ad */ 4570 if (bond_mode == BOND_MODE_8023AD) { 4571 if (!miimon) { 4572 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"); 4573 pr_warning("Forcing miimon to 100msec\n"); 4574 miimon = 100; 4575 } 4576 } 4577 4578 if (tx_queues < 1 || tx_queues > 255) { 4579 pr_warning("Warning: tx_queues (%d) should be between " 4580 "1 and 255, resetting to %d\n", 4581 tx_queues, BOND_DEFAULT_TX_QUEUES); 4582 tx_queues = BOND_DEFAULT_TX_QUEUES; 4583 } 4584 4585 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 4586 pr_warning("Warning: all_slaves_active module parameter (%d), " 4587 "not of valid value (0/1), so it was set to " 4588 "0\n", all_slaves_active); 4589 all_slaves_active = 0; 4590 } 4591 4592 if (resend_igmp < 0 || resend_igmp > 255) { 4593 pr_warning("Warning: resend_igmp (%d) should be between " 4594 "0 and 255, resetting to %d\n", 4595 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 4596 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 4597 } 4598 4599 /* reset values for TLB/ALB */ 4600 if ((bond_mode == BOND_MODE_TLB) || 4601 (bond_mode == BOND_MODE_ALB)) { 4602 if (!miimon) { 4603 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"); 4604 pr_warning("Forcing miimon to 100msec\n"); 4605 miimon = 100; 4606 } 4607 } 4608 4609 if (bond_mode == BOND_MODE_ALB) { 4610 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", 4611 updelay); 4612 } 4613 4614 if (!miimon) { 4615 if (updelay || downdelay) { 4616 /* just warn the user the up/down delay will have 4617 * no effect since miimon is zero... 4618 */ 4619 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", 4620 updelay, downdelay); 4621 } 4622 } else { 4623 /* don't allow arp monitoring */ 4624 if (arp_interval) { 4625 pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 4626 miimon, arp_interval); 4627 arp_interval = 0; 4628 } 4629 4630 if ((updelay % miimon) != 0) { 4631 pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 4632 updelay, miimon, 4633 (updelay / miimon) * miimon); 4634 } 4635 4636 updelay /= miimon; 4637 4638 if ((downdelay % miimon) != 0) { 4639 pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 4640 downdelay, miimon, 4641 (downdelay / miimon) * miimon); 4642 } 4643 4644 downdelay /= miimon; 4645 } 4646 4647 if (arp_interval < 0) { 4648 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n", 4649 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV); 4650 arp_interval = BOND_LINK_ARP_INTERV; 4651 } 4652 4653 for (arp_ip_count = 0; 4654 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count]; 4655 arp_ip_count++) { 4656 /* not complete check, but should be good enough to 4657 catch mistakes */ 4658 if (!isdigit(arp_ip_target[arp_ip_count][0])) { 4659 pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 4660 arp_ip_target[arp_ip_count]); 4661 arp_interval = 0; 4662 } else { 4663 __be32 ip = in_aton(arp_ip_target[arp_ip_count]); 4664 arp_target[arp_ip_count] = ip; 4665 } 4666 } 4667 4668 if (arp_interval && !arp_ip_count) { 4669 /* don't allow arping if no arp_ip_target given... */ 4670 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 4671 arp_interval); 4672 arp_interval = 0; 4673 } 4674 4675 if (arp_validate) { 4676 if (bond_mode != BOND_MODE_ACTIVEBACKUP) { 4677 pr_err("arp_validate only supported in active-backup mode\n"); 4678 return -EINVAL; 4679 } 4680 if (!arp_interval) { 4681 pr_err("arp_validate requires arp_interval\n"); 4682 return -EINVAL; 4683 } 4684 4685 arp_validate_value = bond_parse_parm(arp_validate, 4686 arp_validate_tbl); 4687 if (arp_validate_value == -1) { 4688 pr_err("Error: invalid arp_validate \"%s\"\n", 4689 arp_validate == NULL ? "NULL" : arp_validate); 4690 return -EINVAL; 4691 } 4692 } else 4693 arp_validate_value = 0; 4694 4695 if (miimon) { 4696 pr_info("MII link monitoring set to %d ms\n", miimon); 4697 } else if (arp_interval) { 4698 int i; 4699 4700 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 4701 arp_interval, 4702 arp_validate_tbl[arp_validate_value].modename, 4703 arp_ip_count); 4704 4705 for (i = 0; i < arp_ip_count; i++) 4706 pr_info(" %s", arp_ip_target[i]); 4707 4708 pr_info("\n"); 4709 4710 } else if (max_bonds) { 4711 /* miimon and arp_interval not set, we need one so things 4712 * work as expected, see bonding.txt for details 4713 */ 4714 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"); 4715 } 4716 4717 if (primary && !USES_PRIMARY(bond_mode)) { 4718 /* currently, using a primary only makes sense 4719 * in active backup, TLB or ALB modes 4720 */ 4721 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n", 4722 primary, bond_mode_name(bond_mode)); 4723 primary = NULL; 4724 } 4725 4726 if (primary && primary_reselect) { 4727 primary_reselect_value = bond_parse_parm(primary_reselect, 4728 pri_reselect_tbl); 4729 if (primary_reselect_value == -1) { 4730 pr_err("Error: Invalid primary_reselect \"%s\"\n", 4731 primary_reselect == 4732 NULL ? "NULL" : primary_reselect); 4733 return -EINVAL; 4734 } 4735 } else { 4736 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 4737 } 4738 4739 if (fail_over_mac) { 4740 fail_over_mac_value = bond_parse_parm(fail_over_mac, 4741 fail_over_mac_tbl); 4742 if (fail_over_mac_value == -1) { 4743 pr_err("Error: invalid fail_over_mac \"%s\"\n", 4744 arp_validate == NULL ? "NULL" : arp_validate); 4745 return -EINVAL; 4746 } 4747 4748 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 4749 pr_warning("Warning: fail_over_mac only affects active-backup mode.\n"); 4750 } else { 4751 fail_over_mac_value = BOND_FOM_NONE; 4752 } 4753 4754 /* fill params struct with the proper values */ 4755 params->mode = bond_mode; 4756 params->xmit_policy = xmit_hashtype; 4757 params->miimon = miimon; 4758 params->num_peer_notif = num_peer_notif; 4759 params->arp_interval = arp_interval; 4760 params->arp_validate = arp_validate_value; 4761 params->updelay = updelay; 4762 params->downdelay = downdelay; 4763 params->use_carrier = use_carrier; 4764 params->lacp_fast = lacp_fast; 4765 params->primary[0] = 0; 4766 params->primary_reselect = primary_reselect_value; 4767 params->fail_over_mac = fail_over_mac_value; 4768 params->tx_queues = tx_queues; 4769 params->all_slaves_active = all_slaves_active; 4770 params->resend_igmp = resend_igmp; 4771 params->min_links = min_links; 4772 4773 if (primary) { 4774 strncpy(params->primary, primary, IFNAMSIZ); 4775 params->primary[IFNAMSIZ - 1] = 0; 4776 } 4777 4778 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 4779 4780 return 0; 4781 } 4782 4783 static struct lock_class_key bonding_netdev_xmit_lock_key; 4784 static struct lock_class_key bonding_netdev_addr_lock_key; 4785 4786 static void bond_set_lockdep_class_one(struct net_device *dev, 4787 struct netdev_queue *txq, 4788 void *_unused) 4789 { 4790 lockdep_set_class(&txq->_xmit_lock, 4791 &bonding_netdev_xmit_lock_key); 4792 } 4793 4794 static void bond_set_lockdep_class(struct net_device *dev) 4795 { 4796 lockdep_set_class(&dev->addr_list_lock, 4797 &bonding_netdev_addr_lock_key); 4798 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL); 4799 } 4800 4801 /* 4802 * Called from registration process 4803 */ 4804 static int bond_init(struct net_device *bond_dev) 4805 { 4806 struct bonding *bond = netdev_priv(bond_dev); 4807 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 4808 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); 4809 4810 pr_debug("Begin bond_init for %s\n", bond_dev->name); 4811 4812 /* 4813 * Initialize locks that may be required during 4814 * en/deslave operations. All of the bond_open work 4815 * (of which this is part) should really be moved to 4816 * a phase prior to dev_open 4817 */ 4818 spin_lock_init(&(bond_info->tx_hashtbl_lock)); 4819 spin_lock_init(&(bond_info->rx_hashtbl_lock)); 4820 4821 bond->wq = create_singlethread_workqueue(bond_dev->name); 4822 if (!bond->wq) 4823 return -ENOMEM; 4824 4825 bond_set_lockdep_class(bond_dev); 4826 4827 list_add_tail(&bond->bond_list, &bn->dev_list); 4828 4829 bond_prepare_sysfs_group(bond); 4830 4831 bond_debug_register(bond); 4832 4833 __hw_addr_init(&bond->mc_list); 4834 return 0; 4835 } 4836 4837 static int bond_validate(struct nlattr *tb[], struct nlattr *data[]) 4838 { 4839 if (tb[IFLA_ADDRESS]) { 4840 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 4841 return -EINVAL; 4842 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 4843 return -EADDRNOTAVAIL; 4844 } 4845 return 0; 4846 } 4847 4848 static unsigned int bond_get_num_tx_queues(void) 4849 { 4850 return tx_queues; 4851 } 4852 4853 static struct rtnl_link_ops bond_link_ops __read_mostly = { 4854 .kind = "bond", 4855 .priv_size = sizeof(struct bonding), 4856 .setup = bond_setup, 4857 .validate = bond_validate, 4858 .get_num_tx_queues = bond_get_num_tx_queues, 4859 .get_num_rx_queues = bond_get_num_tx_queues, /* Use the same number 4860 as for TX queues */ 4861 }; 4862 4863 /* Create a new bond based on the specified name and bonding parameters. 4864 * If name is NULL, obtain a suitable "bond%d" name for us. 4865 * Caller must NOT hold rtnl_lock; we need to release it here before we 4866 * set up our sysfs entries. 4867 */ 4868 int bond_create(struct net *net, const char *name) 4869 { 4870 struct net_device *bond_dev; 4871 int res; 4872 4873 rtnl_lock(); 4874 4875 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 4876 name ? name : "bond%d", 4877 bond_setup, tx_queues); 4878 if (!bond_dev) { 4879 pr_err("%s: eek! can't alloc netdev!\n", name); 4880 rtnl_unlock(); 4881 return -ENOMEM; 4882 } 4883 4884 dev_net_set(bond_dev, net); 4885 bond_dev->rtnl_link_ops = &bond_link_ops; 4886 4887 res = register_netdevice(bond_dev); 4888 4889 netif_carrier_off(bond_dev); 4890 4891 rtnl_unlock(); 4892 if (res < 0) 4893 bond_destructor(bond_dev); 4894 return res; 4895 } 4896 4897 static int __net_init bond_net_init(struct net *net) 4898 { 4899 struct bond_net *bn = net_generic(net, bond_net_id); 4900 4901 bn->net = net; 4902 INIT_LIST_HEAD(&bn->dev_list); 4903 4904 bond_create_proc_dir(bn); 4905 bond_create_sysfs(bn); 4906 4907 return 0; 4908 } 4909 4910 static void __net_exit bond_net_exit(struct net *net) 4911 { 4912 struct bond_net *bn = net_generic(net, bond_net_id); 4913 4914 bond_destroy_sysfs(bn); 4915 bond_destroy_proc_dir(bn); 4916 } 4917 4918 static struct pernet_operations bond_net_ops = { 4919 .init = bond_net_init, 4920 .exit = bond_net_exit, 4921 .id = &bond_net_id, 4922 .size = sizeof(struct bond_net), 4923 }; 4924 4925 static int __init bonding_init(void) 4926 { 4927 int i; 4928 int res; 4929 4930 pr_info("%s", bond_version); 4931 4932 res = bond_check_params(&bonding_defaults); 4933 if (res) 4934 goto out; 4935 4936 res = register_pernet_subsys(&bond_net_ops); 4937 if (res) 4938 goto out; 4939 4940 res = rtnl_link_register(&bond_link_ops); 4941 if (res) 4942 goto err_link; 4943 4944 bond_create_debugfs(); 4945 4946 for (i = 0; i < max_bonds; i++) { 4947 res = bond_create(&init_net, NULL); 4948 if (res) 4949 goto err; 4950 } 4951 4952 register_netdevice_notifier(&bond_netdev_notifier); 4953 out: 4954 return res; 4955 err: 4956 rtnl_link_unregister(&bond_link_ops); 4957 err_link: 4958 unregister_pernet_subsys(&bond_net_ops); 4959 goto out; 4960 4961 } 4962 4963 static void __exit bonding_exit(void) 4964 { 4965 unregister_netdevice_notifier(&bond_netdev_notifier); 4966 4967 bond_destroy_debugfs(); 4968 4969 rtnl_link_unregister(&bond_link_ops); 4970 unregister_pernet_subsys(&bond_net_ops); 4971 4972 #ifdef CONFIG_NET_POLL_CONTROLLER 4973 /* 4974 * Make sure we don't have an imbalance on our netpoll blocking 4975 */ 4976 WARN_ON(atomic_read(&netpoll_block_tx)); 4977 #endif 4978 } 4979 4980 module_init(bonding_init); 4981 module_exit(bonding_exit); 4982 MODULE_LICENSE("GPL"); 4983 MODULE_VERSION(DRV_VERSION); 4984 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION); 4985 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 4986 MODULE_ALIAS_RTNL_LINK("bond"); 4987