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(bond->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, 432 __be16 proto, u16 vid) 433 { 434 struct bonding *bond = netdev_priv(bond_dev); 435 struct slave *slave, *stop_at; 436 int i, res; 437 438 bond_for_each_slave(bond, slave, i) { 439 res = vlan_vid_add(slave->dev, proto, vid); 440 if (res) 441 goto unwind; 442 } 443 444 res = bond_add_vlan(bond, vid); 445 if (res) { 446 pr_err("%s: Error: Failed to add vlan id %d\n", 447 bond_dev->name, vid); 448 return res; 449 } 450 451 return 0; 452 453 unwind: 454 /* unwind from head to the slave that failed */ 455 stop_at = slave; 456 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) 457 vlan_vid_del(slave->dev, proto, vid); 458 459 return res; 460 } 461 462 /** 463 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves 464 * @bond_dev: bonding net device that got called 465 * @vid: vlan id being removed 466 */ 467 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, 468 __be16 proto, u16 vid) 469 { 470 struct bonding *bond = netdev_priv(bond_dev); 471 struct slave *slave; 472 int i, res; 473 474 bond_for_each_slave(bond, slave, i) 475 vlan_vid_del(slave->dev, proto, vid); 476 477 res = bond_del_vlan(bond, vid); 478 if (res) { 479 pr_err("%s: Error: Failed to remove vlan id %d\n", 480 bond_dev->name, vid); 481 return res; 482 } 483 484 return 0; 485 } 486 487 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev) 488 { 489 struct vlan_entry *vlan; 490 int res; 491 492 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 493 res = vlan_vid_add(slave_dev, htons(ETH_P_8021Q), 494 vlan->vlan_id); 495 if (res) 496 pr_warning("%s: Failed to add vlan id %d to device %s\n", 497 bond->dev->name, vlan->vlan_id, 498 slave_dev->name); 499 } 500 } 501 502 static void bond_del_vlans_from_slave(struct bonding *bond, 503 struct net_device *slave_dev) 504 { 505 struct vlan_entry *vlan; 506 507 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 508 if (!vlan->vlan_id) 509 continue; 510 vlan_vid_del(slave_dev, htons(ETH_P_8021Q), vlan->vlan_id); 511 } 512 } 513 514 /*------------------------------- Link status -------------------------------*/ 515 516 /* 517 * Set the carrier state for the master according to the state of its 518 * slaves. If any slaves are up, the master is up. In 802.3ad mode, 519 * do special 802.3ad magic. 520 * 521 * Returns zero if carrier state does not change, nonzero if it does. 522 */ 523 static int bond_set_carrier(struct bonding *bond) 524 { 525 struct slave *slave; 526 int i; 527 528 if (bond->slave_cnt == 0) 529 goto down; 530 531 if (bond->params.mode == BOND_MODE_8023AD) 532 return bond_3ad_set_carrier(bond); 533 534 bond_for_each_slave(bond, slave, i) { 535 if (slave->link == BOND_LINK_UP) { 536 if (!netif_carrier_ok(bond->dev)) { 537 netif_carrier_on(bond->dev); 538 return 1; 539 } 540 return 0; 541 } 542 } 543 544 down: 545 if (netif_carrier_ok(bond->dev)) { 546 netif_carrier_off(bond->dev); 547 return 1; 548 } 549 return 0; 550 } 551 552 /* 553 * Get link speed and duplex from the slave's base driver 554 * using ethtool. If for some reason the call fails or the 555 * values are invalid, set speed and duplex to -1, 556 * and return. 557 */ 558 static void bond_update_speed_duplex(struct slave *slave) 559 { 560 struct net_device *slave_dev = slave->dev; 561 struct ethtool_cmd ecmd; 562 u32 slave_speed; 563 int res; 564 565 slave->speed = SPEED_UNKNOWN; 566 slave->duplex = DUPLEX_UNKNOWN; 567 568 res = __ethtool_get_settings(slave_dev, &ecmd); 569 if (res < 0) 570 return; 571 572 slave_speed = ethtool_cmd_speed(&ecmd); 573 if (slave_speed == 0 || slave_speed == ((__u32) -1)) 574 return; 575 576 switch (ecmd.duplex) { 577 case DUPLEX_FULL: 578 case DUPLEX_HALF: 579 break; 580 default: 581 return; 582 } 583 584 slave->speed = slave_speed; 585 slave->duplex = ecmd.duplex; 586 587 return; 588 } 589 590 /* 591 * if <dev> supports MII link status reporting, check its link status. 592 * 593 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), 594 * depending upon the setting of the use_carrier parameter. 595 * 596 * Return either BMSR_LSTATUS, meaning that the link is up (or we 597 * can't tell and just pretend it is), or 0, meaning that the link is 598 * down. 599 * 600 * If reporting is non-zero, instead of faking link up, return -1 if 601 * both ETHTOOL and MII ioctls fail (meaning the device does not 602 * support them). If use_carrier is set, return whatever it says. 603 * It'd be nice if there was a good way to tell if a driver supports 604 * netif_carrier, but there really isn't. 605 */ 606 static int bond_check_dev_link(struct bonding *bond, 607 struct net_device *slave_dev, int reporting) 608 { 609 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 610 int (*ioctl)(struct net_device *, struct ifreq *, int); 611 struct ifreq ifr; 612 struct mii_ioctl_data *mii; 613 614 if (!reporting && !netif_running(slave_dev)) 615 return 0; 616 617 if (bond->params.use_carrier) 618 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; 619 620 /* Try to get link status using Ethtool first. */ 621 if (slave_dev->ethtool_ops->get_link) 622 return slave_dev->ethtool_ops->get_link(slave_dev) ? 623 BMSR_LSTATUS : 0; 624 625 /* Ethtool can't be used, fallback to MII ioctls. */ 626 ioctl = slave_ops->ndo_do_ioctl; 627 if (ioctl) { 628 /* TODO: set pointer to correct ioctl on a per team member */ 629 /* bases to make this more efficient. that is, once */ 630 /* we determine the correct ioctl, we will always */ 631 /* call it and not the others for that team */ 632 /* member. */ 633 634 /* 635 * We cannot assume that SIOCGMIIPHY will also read a 636 * register; not all network drivers (e.g., e100) 637 * support that. 638 */ 639 640 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ 641 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ); 642 mii = if_mii(&ifr); 643 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) { 644 mii->reg_num = MII_BMSR; 645 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) 646 return mii->val_out & BMSR_LSTATUS; 647 } 648 } 649 650 /* 651 * If reporting, report that either there's no dev->do_ioctl, 652 * or both SIOCGMIIREG and get_link failed (meaning that we 653 * cannot report link status). If not reporting, pretend 654 * we're ok. 655 */ 656 return reporting ? -1 : BMSR_LSTATUS; 657 } 658 659 /*----------------------------- Multicast list ------------------------------*/ 660 661 /* 662 * Push the promiscuity flag down to appropriate slaves 663 */ 664 static int bond_set_promiscuity(struct bonding *bond, int inc) 665 { 666 int err = 0; 667 if (USES_PRIMARY(bond->params.mode)) { 668 /* write lock already acquired */ 669 if (bond->curr_active_slave) { 670 err = dev_set_promiscuity(bond->curr_active_slave->dev, 671 inc); 672 } 673 } else { 674 struct slave *slave; 675 int i; 676 bond_for_each_slave(bond, slave, i) { 677 err = dev_set_promiscuity(slave->dev, inc); 678 if (err) 679 return err; 680 } 681 } 682 return err; 683 } 684 685 /* 686 * Push the allmulti flag down to all slaves 687 */ 688 static int bond_set_allmulti(struct bonding *bond, int inc) 689 { 690 int err = 0; 691 if (USES_PRIMARY(bond->params.mode)) { 692 /* write lock already acquired */ 693 if (bond->curr_active_slave) { 694 err = dev_set_allmulti(bond->curr_active_slave->dev, 695 inc); 696 } 697 } else { 698 struct slave *slave; 699 int i; 700 bond_for_each_slave(bond, slave, i) { 701 err = dev_set_allmulti(slave->dev, inc); 702 if (err) 703 return err; 704 } 705 } 706 return err; 707 } 708 709 /* 710 * Add a Multicast address to slaves 711 * according to mode 712 */ 713 static void bond_mc_add(struct bonding *bond, void *addr) 714 { 715 if (USES_PRIMARY(bond->params.mode)) { 716 /* write lock already acquired */ 717 if (bond->curr_active_slave) 718 dev_mc_add(bond->curr_active_slave->dev, addr); 719 } else { 720 struct slave *slave; 721 int i; 722 723 bond_for_each_slave(bond, slave, i) 724 dev_mc_add(slave->dev, addr); 725 } 726 } 727 728 /* 729 * Remove a multicast address from slave 730 * according to mode 731 */ 732 static void bond_mc_del(struct bonding *bond, void *addr) 733 { 734 if (USES_PRIMARY(bond->params.mode)) { 735 /* write lock already acquired */ 736 if (bond->curr_active_slave) 737 dev_mc_del(bond->curr_active_slave->dev, addr); 738 } else { 739 struct slave *slave; 740 int i; 741 bond_for_each_slave(bond, slave, i) { 742 dev_mc_del(slave->dev, addr); 743 } 744 } 745 } 746 747 748 static void __bond_resend_igmp_join_requests(struct net_device *dev) 749 { 750 struct in_device *in_dev; 751 752 in_dev = __in_dev_get_rcu(dev); 753 if (in_dev) 754 ip_mc_rejoin_groups(in_dev); 755 } 756 757 /* 758 * Retrieve the list of registered multicast addresses for the bonding 759 * device and retransmit an IGMP JOIN request to the current active 760 * slave. 761 */ 762 static void bond_resend_igmp_join_requests(struct bonding *bond) 763 { 764 struct net_device *bond_dev, *vlan_dev, *upper_dev; 765 struct vlan_entry *vlan; 766 767 read_lock(&bond->lock); 768 rcu_read_lock(); 769 770 bond_dev = bond->dev; 771 772 /* rejoin all groups on bond device */ 773 __bond_resend_igmp_join_requests(bond_dev); 774 775 /* 776 * if bond is enslaved to a bridge, 777 * then rejoin all groups on its master 778 */ 779 upper_dev = netdev_master_upper_dev_get_rcu(bond_dev); 780 if (upper_dev && upper_dev->priv_flags & IFF_EBRIDGE) 781 __bond_resend_igmp_join_requests(upper_dev); 782 783 /* rejoin all groups on vlan devices */ 784 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 785 vlan_dev = __vlan_find_dev_deep(bond_dev, htons(ETH_P_8021Q), 786 vlan->vlan_id); 787 if (vlan_dev) 788 __bond_resend_igmp_join_requests(vlan_dev); 789 } 790 rcu_read_unlock(); 791 792 /* We use curr_slave_lock to protect against concurrent access to 793 * igmp_retrans from multiple running instances of this function and 794 * bond_change_active_slave 795 */ 796 write_lock_bh(&bond->curr_slave_lock); 797 if (bond->igmp_retrans > 1) { 798 bond->igmp_retrans--; 799 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); 800 } 801 write_unlock_bh(&bond->curr_slave_lock); 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); 809 810 bond_resend_igmp_join_requests(bond); 811 } 812 813 /* 814 * flush all members of flush->mc_list from device dev->mc_list 815 */ 816 static void bond_mc_list_flush(struct net_device *bond_dev, 817 struct net_device *slave_dev) 818 { 819 struct bonding *bond = netdev_priv(bond_dev); 820 struct netdev_hw_addr *ha; 821 822 netdev_for_each_mc_addr(ha, bond_dev) 823 dev_mc_del(slave_dev, ha->addr); 824 825 if (bond->params.mode == BOND_MODE_8023AD) { 826 /* del lacpdu mc addr from mc list */ 827 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 828 829 dev_mc_del(slave_dev, lacpdu_multicast); 830 } 831 } 832 833 /*--------------------------- Active slave change ---------------------------*/ 834 835 /* 836 * Update the mc list and multicast-related flags for the new and 837 * old active slaves (if any) according to the multicast mode, and 838 * promiscuous flags unconditionally. 839 */ 840 static void bond_mc_swap(struct bonding *bond, struct slave *new_active, 841 struct slave *old_active) 842 { 843 struct netdev_hw_addr *ha; 844 845 if (!USES_PRIMARY(bond->params.mode)) 846 /* nothing to do - mc list is already up-to-date on 847 * all slaves 848 */ 849 return; 850 851 if (old_active) { 852 if (bond->dev->flags & IFF_PROMISC) 853 dev_set_promiscuity(old_active->dev, -1); 854 855 if (bond->dev->flags & IFF_ALLMULTI) 856 dev_set_allmulti(old_active->dev, -1); 857 858 netif_addr_lock_bh(bond->dev); 859 netdev_for_each_mc_addr(ha, bond->dev) 860 dev_mc_del(old_active->dev, ha->addr); 861 netif_addr_unlock_bh(bond->dev); 862 } 863 864 if (new_active) { 865 /* FIXME: Signal errors upstream. */ 866 if (bond->dev->flags & IFF_PROMISC) 867 dev_set_promiscuity(new_active->dev, 1); 868 869 if (bond->dev->flags & IFF_ALLMULTI) 870 dev_set_allmulti(new_active->dev, 1); 871 872 netif_addr_lock_bh(bond->dev); 873 netdev_for_each_mc_addr(ha, bond->dev) 874 dev_mc_add(new_active->dev, ha->addr); 875 netif_addr_unlock_bh(bond->dev); 876 } 877 } 878 879 /* 880 * bond_do_fail_over_mac 881 * 882 * Perform special MAC address swapping for fail_over_mac settings 883 * 884 * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh. 885 */ 886 static void bond_do_fail_over_mac(struct bonding *bond, 887 struct slave *new_active, 888 struct slave *old_active) 889 __releases(&bond->curr_slave_lock) 890 __releases(&bond->lock) 891 __acquires(&bond->lock) 892 __acquires(&bond->curr_slave_lock) 893 { 894 u8 tmp_mac[ETH_ALEN]; 895 struct sockaddr saddr; 896 int rv; 897 898 switch (bond->params.fail_over_mac) { 899 case BOND_FOM_ACTIVE: 900 if (new_active) { 901 memcpy(bond->dev->dev_addr, new_active->dev->dev_addr, 902 new_active->dev->addr_len); 903 write_unlock_bh(&bond->curr_slave_lock); 904 read_unlock(&bond->lock); 905 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 906 read_lock(&bond->lock); 907 write_lock_bh(&bond->curr_slave_lock); 908 } 909 break; 910 case BOND_FOM_FOLLOW: 911 /* 912 * if new_active && old_active, swap them 913 * if just old_active, do nothing (going to no active slave) 914 * if just new_active, set new_active to bond's MAC 915 */ 916 if (!new_active) 917 return; 918 919 write_unlock_bh(&bond->curr_slave_lock); 920 read_unlock(&bond->lock); 921 922 if (old_active) { 923 memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN); 924 memcpy(saddr.sa_data, old_active->dev->dev_addr, 925 ETH_ALEN); 926 saddr.sa_family = new_active->dev->type; 927 } else { 928 memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN); 929 saddr.sa_family = bond->dev->type; 930 } 931 932 rv = dev_set_mac_address(new_active->dev, &saddr); 933 if (rv) { 934 pr_err("%s: Error %d setting MAC of slave %s\n", 935 bond->dev->name, -rv, new_active->dev->name); 936 goto out; 937 } 938 939 if (!old_active) 940 goto out; 941 942 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN); 943 saddr.sa_family = old_active->dev->type; 944 945 rv = dev_set_mac_address(old_active->dev, &saddr); 946 if (rv) 947 pr_err("%s: Error %d setting MAC of slave %s\n", 948 bond->dev->name, -rv, new_active->dev->name); 949 out: 950 read_lock(&bond->lock); 951 write_lock_bh(&bond->curr_slave_lock); 952 break; 953 default: 954 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n", 955 bond->dev->name, bond->params.fail_over_mac); 956 break; 957 } 958 959 } 960 961 static bool bond_should_change_active(struct bonding *bond) 962 { 963 struct slave *prim = bond->primary_slave; 964 struct slave *curr = bond->curr_active_slave; 965 966 if (!prim || !curr || curr->link != BOND_LINK_UP) 967 return true; 968 if (bond->force_primary) { 969 bond->force_primary = false; 970 return true; 971 } 972 if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER && 973 (prim->speed < curr->speed || 974 (prim->speed == curr->speed && prim->duplex <= curr->duplex))) 975 return false; 976 if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE) 977 return false; 978 return true; 979 } 980 981 /** 982 * find_best_interface - select the best available slave to be the active one 983 * @bond: our bonding struct 984 * 985 * Warning: Caller must hold curr_slave_lock for writing. 986 */ 987 static struct slave *bond_find_best_slave(struct bonding *bond) 988 { 989 struct slave *new_active, *old_active; 990 struct slave *bestslave = NULL; 991 int mintime = bond->params.updelay; 992 int i; 993 994 new_active = bond->curr_active_slave; 995 996 if (!new_active) { /* there were no active slaves left */ 997 if (bond->slave_cnt > 0) /* found one slave */ 998 new_active = bond->first_slave; 999 else 1000 return NULL; /* still no slave, return NULL */ 1001 } 1002 1003 if ((bond->primary_slave) && 1004 bond->primary_slave->link == BOND_LINK_UP && 1005 bond_should_change_active(bond)) { 1006 new_active = bond->primary_slave; 1007 } 1008 1009 /* remember where to stop iterating over the slaves */ 1010 old_active = new_active; 1011 1012 bond_for_each_slave_from(bond, new_active, i, old_active) { 1013 if (new_active->link == BOND_LINK_UP) { 1014 return new_active; 1015 } else if (new_active->link == BOND_LINK_BACK && 1016 IS_UP(new_active->dev)) { 1017 /* link up, but waiting for stabilization */ 1018 if (new_active->delay < mintime) { 1019 mintime = new_active->delay; 1020 bestslave = new_active; 1021 } 1022 } 1023 } 1024 1025 return bestslave; 1026 } 1027 1028 static bool bond_should_notify_peers(struct bonding *bond) 1029 { 1030 struct slave *slave = bond->curr_active_slave; 1031 1032 pr_debug("bond_should_notify_peers: bond %s slave %s\n", 1033 bond->dev->name, slave ? slave->dev->name : "NULL"); 1034 1035 if (!slave || !bond->send_peer_notif || 1036 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) 1037 return false; 1038 1039 bond->send_peer_notif--; 1040 return true; 1041 } 1042 1043 /** 1044 * change_active_interface - change the active slave into the specified one 1045 * @bond: our bonding struct 1046 * @new: the new slave to make the active one 1047 * 1048 * Set the new slave to the bond's settings and unset them on the old 1049 * curr_active_slave. 1050 * Setting include flags, mc-list, promiscuity, allmulti, etc. 1051 * 1052 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, 1053 * because it is apparently the best available slave we have, even though its 1054 * updelay hasn't timed out yet. 1055 * 1056 * If new_active is not NULL, caller must hold bond->lock for read and 1057 * curr_slave_lock for write_bh. 1058 */ 1059 void bond_change_active_slave(struct bonding *bond, struct slave *new_active) 1060 { 1061 struct slave *old_active = bond->curr_active_slave; 1062 1063 if (old_active == new_active) 1064 return; 1065 1066 if (new_active) { 1067 new_active->jiffies = jiffies; 1068 1069 if (new_active->link == BOND_LINK_BACK) { 1070 if (USES_PRIMARY(bond->params.mode)) { 1071 pr_info("%s: making interface %s the new active one %d ms earlier.\n", 1072 bond->dev->name, new_active->dev->name, 1073 (bond->params.updelay - new_active->delay) * bond->params.miimon); 1074 } 1075 1076 new_active->delay = 0; 1077 new_active->link = BOND_LINK_UP; 1078 1079 if (bond->params.mode == BOND_MODE_8023AD) 1080 bond_3ad_handle_link_change(new_active, BOND_LINK_UP); 1081 1082 if (bond_is_lb(bond)) 1083 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); 1084 } else { 1085 if (USES_PRIMARY(bond->params.mode)) { 1086 pr_info("%s: making interface %s the new active one.\n", 1087 bond->dev->name, new_active->dev->name); 1088 } 1089 } 1090 } 1091 1092 if (USES_PRIMARY(bond->params.mode)) 1093 bond_mc_swap(bond, new_active, old_active); 1094 1095 if (bond_is_lb(bond)) { 1096 bond_alb_handle_active_change(bond, new_active); 1097 if (old_active) 1098 bond_set_slave_inactive_flags(old_active); 1099 if (new_active) 1100 bond_set_slave_active_flags(new_active); 1101 } else { 1102 bond->curr_active_slave = new_active; 1103 } 1104 1105 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) { 1106 if (old_active) 1107 bond_set_slave_inactive_flags(old_active); 1108 1109 if (new_active) { 1110 bool should_notify_peers = false; 1111 1112 bond_set_slave_active_flags(new_active); 1113 1114 if (bond->params.fail_over_mac) 1115 bond_do_fail_over_mac(bond, new_active, 1116 old_active); 1117 1118 if (netif_running(bond->dev)) { 1119 bond->send_peer_notif = 1120 bond->params.num_peer_notif; 1121 should_notify_peers = 1122 bond_should_notify_peers(bond); 1123 } 1124 1125 write_unlock_bh(&bond->curr_slave_lock); 1126 read_unlock(&bond->lock); 1127 1128 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev); 1129 if (should_notify_peers) 1130 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 1131 bond->dev); 1132 1133 read_lock(&bond->lock); 1134 write_lock_bh(&bond->curr_slave_lock); 1135 } 1136 } 1137 1138 /* resend IGMP joins since active slave has changed or 1139 * all were sent on curr_active_slave. 1140 * resend only if bond is brought up with the affected 1141 * bonding modes and the retransmission is enabled */ 1142 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && 1143 ((USES_PRIMARY(bond->params.mode) && new_active) || 1144 bond->params.mode == BOND_MODE_ROUNDROBIN)) { 1145 bond->igmp_retrans = bond->params.resend_igmp; 1146 queue_delayed_work(bond->wq, &bond->mcast_work, 0); 1147 } 1148 } 1149 1150 /** 1151 * bond_select_active_slave - select a new active slave, if needed 1152 * @bond: our bonding struct 1153 * 1154 * This functions should be called when one of the following occurs: 1155 * - The old curr_active_slave has been released or lost its link. 1156 * - The primary_slave has got its link back. 1157 * - A slave has got its link back and there's no old curr_active_slave. 1158 * 1159 * Caller must hold bond->lock for read and curr_slave_lock for write_bh. 1160 */ 1161 void bond_select_active_slave(struct bonding *bond) 1162 { 1163 struct slave *best_slave; 1164 int rv; 1165 1166 best_slave = bond_find_best_slave(bond); 1167 if (best_slave != bond->curr_active_slave) { 1168 bond_change_active_slave(bond, best_slave); 1169 rv = bond_set_carrier(bond); 1170 if (!rv) 1171 return; 1172 1173 if (netif_carrier_ok(bond->dev)) { 1174 pr_info("%s: first active interface up!\n", 1175 bond->dev->name); 1176 } else { 1177 pr_info("%s: now running without any active interface !\n", 1178 bond->dev->name); 1179 } 1180 } 1181 } 1182 1183 /*--------------------------- slave list handling ---------------------------*/ 1184 1185 /* 1186 * This function attaches the slave to the end of list. 1187 * 1188 * bond->lock held for writing by caller. 1189 */ 1190 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave) 1191 { 1192 if (bond->first_slave == NULL) { /* attaching the first slave */ 1193 new_slave->next = new_slave; 1194 new_slave->prev = new_slave; 1195 bond->first_slave = new_slave; 1196 } else { 1197 new_slave->next = bond->first_slave; 1198 new_slave->prev = bond->first_slave->prev; 1199 new_slave->next->prev = new_slave; 1200 new_slave->prev->next = new_slave; 1201 } 1202 1203 bond->slave_cnt++; 1204 } 1205 1206 /* 1207 * This function detaches the slave from the list. 1208 * WARNING: no check is made to verify if the slave effectively 1209 * belongs to <bond>. 1210 * Nothing is freed on return, structures are just unchained. 1211 * If any slave pointer in bond was pointing to <slave>, 1212 * it should be changed by the calling function. 1213 * 1214 * bond->lock held for writing by caller. 1215 */ 1216 static void bond_detach_slave(struct bonding *bond, struct slave *slave) 1217 { 1218 if (slave->next) 1219 slave->next->prev = slave->prev; 1220 1221 if (slave->prev) 1222 slave->prev->next = slave->next; 1223 1224 if (bond->first_slave == slave) { /* slave is the first slave */ 1225 if (bond->slave_cnt > 1) { /* there are more slave */ 1226 bond->first_slave = slave->next; 1227 } else { 1228 bond->first_slave = NULL; /* slave was the last one */ 1229 } 1230 } 1231 1232 slave->next = NULL; 1233 slave->prev = NULL; 1234 bond->slave_cnt--; 1235 } 1236 1237 #ifdef CONFIG_NET_POLL_CONTROLLER 1238 static inline int slave_enable_netpoll(struct slave *slave) 1239 { 1240 struct netpoll *np; 1241 int err = 0; 1242 1243 np = kzalloc(sizeof(*np), GFP_ATOMIC); 1244 err = -ENOMEM; 1245 if (!np) 1246 goto out; 1247 1248 err = __netpoll_setup(np, slave->dev, GFP_ATOMIC); 1249 if (err) { 1250 kfree(np); 1251 goto out; 1252 } 1253 slave->np = np; 1254 out: 1255 return err; 1256 } 1257 static inline void slave_disable_netpoll(struct slave *slave) 1258 { 1259 struct netpoll *np = slave->np; 1260 1261 if (!np) 1262 return; 1263 1264 slave->np = NULL; 1265 __netpoll_free_async(np); 1266 } 1267 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev) 1268 { 1269 if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL) 1270 return false; 1271 if (!slave_dev->netdev_ops->ndo_poll_controller) 1272 return false; 1273 return true; 1274 } 1275 1276 static void bond_poll_controller(struct net_device *bond_dev) 1277 { 1278 } 1279 1280 static void __bond_netpoll_cleanup(struct bonding *bond) 1281 { 1282 struct slave *slave; 1283 int i; 1284 1285 bond_for_each_slave(bond, slave, i) 1286 if (IS_UP(slave->dev)) 1287 slave_disable_netpoll(slave); 1288 } 1289 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1290 { 1291 struct bonding *bond = netdev_priv(bond_dev); 1292 1293 read_lock(&bond->lock); 1294 __bond_netpoll_cleanup(bond); 1295 read_unlock(&bond->lock); 1296 } 1297 1298 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni, gfp_t gfp) 1299 { 1300 struct bonding *bond = netdev_priv(dev); 1301 struct slave *slave; 1302 int i, err = 0; 1303 1304 read_lock(&bond->lock); 1305 bond_for_each_slave(bond, slave, i) { 1306 err = slave_enable_netpoll(slave); 1307 if (err) { 1308 __bond_netpoll_cleanup(bond); 1309 break; 1310 } 1311 } 1312 read_unlock(&bond->lock); 1313 return err; 1314 } 1315 1316 static struct netpoll_info *bond_netpoll_info(struct bonding *bond) 1317 { 1318 return bond->dev->npinfo; 1319 } 1320 1321 #else 1322 static inline int slave_enable_netpoll(struct slave *slave) 1323 { 1324 return 0; 1325 } 1326 static inline void slave_disable_netpoll(struct slave *slave) 1327 { 1328 } 1329 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1330 { 1331 } 1332 #endif 1333 1334 /*---------------------------------- IOCTL ----------------------------------*/ 1335 1336 static void bond_set_dev_addr(struct net_device *bond_dev, 1337 struct net_device *slave_dev) 1338 { 1339 pr_debug("bond_dev=%p\n", bond_dev); 1340 pr_debug("slave_dev=%p\n", slave_dev); 1341 pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len); 1342 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len); 1343 bond_dev->addr_assign_type = NET_ADDR_SET; 1344 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev); 1345 } 1346 1347 static netdev_features_t bond_fix_features(struct net_device *dev, 1348 netdev_features_t features) 1349 { 1350 struct slave *slave; 1351 struct bonding *bond = netdev_priv(dev); 1352 netdev_features_t mask; 1353 int i; 1354 1355 read_lock(&bond->lock); 1356 1357 if (!bond->first_slave) { 1358 /* Disable adding VLANs to empty bond. But why? --mq */ 1359 features |= NETIF_F_VLAN_CHALLENGED; 1360 goto out; 1361 } 1362 1363 mask = features; 1364 features &= ~NETIF_F_ONE_FOR_ALL; 1365 features |= NETIF_F_ALL_FOR_ALL; 1366 1367 bond_for_each_slave(bond, slave, i) { 1368 features = netdev_increment_features(features, 1369 slave->dev->features, 1370 mask); 1371 } 1372 features = netdev_add_tso_features(features, mask); 1373 1374 out: 1375 read_unlock(&bond->lock); 1376 return features; 1377 } 1378 1379 #define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \ 1380 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \ 1381 NETIF_F_HIGHDMA | NETIF_F_LRO) 1382 1383 static void bond_compute_features(struct bonding *bond) 1384 { 1385 struct slave *slave; 1386 struct net_device *bond_dev = bond->dev; 1387 netdev_features_t vlan_features = BOND_VLAN_FEATURES; 1388 unsigned short max_hard_header_len = ETH_HLEN; 1389 unsigned int gso_max_size = GSO_MAX_SIZE; 1390 u16 gso_max_segs = GSO_MAX_SEGS; 1391 int i; 1392 unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE; 1393 1394 read_lock(&bond->lock); 1395 1396 if (!bond->first_slave) 1397 goto done; 1398 1399 bond_for_each_slave(bond, slave, i) { 1400 vlan_features = netdev_increment_features(vlan_features, 1401 slave->dev->vlan_features, BOND_VLAN_FEATURES); 1402 1403 dst_release_flag &= slave->dev->priv_flags; 1404 if (slave->dev->hard_header_len > max_hard_header_len) 1405 max_hard_header_len = slave->dev->hard_header_len; 1406 1407 gso_max_size = min(gso_max_size, slave->dev->gso_max_size); 1408 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs); 1409 } 1410 1411 done: 1412 bond_dev->vlan_features = vlan_features; 1413 bond_dev->hard_header_len = max_hard_header_len; 1414 bond_dev->gso_max_segs = gso_max_segs; 1415 netif_set_gso_max_size(bond_dev, gso_max_size); 1416 1417 flags = bond_dev->priv_flags & ~IFF_XMIT_DST_RELEASE; 1418 bond_dev->priv_flags = flags | dst_release_flag; 1419 1420 read_unlock(&bond->lock); 1421 1422 netdev_change_features(bond_dev); 1423 } 1424 1425 static void bond_setup_by_slave(struct net_device *bond_dev, 1426 struct net_device *slave_dev) 1427 { 1428 struct bonding *bond = netdev_priv(bond_dev); 1429 1430 bond_dev->header_ops = slave_dev->header_ops; 1431 1432 bond_dev->type = slave_dev->type; 1433 bond_dev->hard_header_len = slave_dev->hard_header_len; 1434 bond_dev->addr_len = slave_dev->addr_len; 1435 1436 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1437 slave_dev->addr_len); 1438 bond->setup_by_slave = 1; 1439 } 1440 1441 /* On bonding slaves other than the currently active slave, suppress 1442 * duplicates except for alb non-mcast/bcast. 1443 */ 1444 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1445 struct slave *slave, 1446 struct bonding *bond) 1447 { 1448 if (bond_is_slave_inactive(slave)) { 1449 if (bond->params.mode == BOND_MODE_ALB && 1450 skb->pkt_type != PACKET_BROADCAST && 1451 skb->pkt_type != PACKET_MULTICAST) 1452 return false; 1453 return true; 1454 } 1455 return false; 1456 } 1457 1458 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1459 { 1460 struct sk_buff *skb = *pskb; 1461 struct slave *slave; 1462 struct bonding *bond; 1463 int (*recv_probe)(const struct sk_buff *, struct bonding *, 1464 struct slave *); 1465 int ret = RX_HANDLER_ANOTHER; 1466 1467 skb = skb_share_check(skb, GFP_ATOMIC); 1468 if (unlikely(!skb)) 1469 return RX_HANDLER_CONSUMED; 1470 1471 *pskb = skb; 1472 1473 slave = bond_slave_get_rcu(skb->dev); 1474 bond = slave->bond; 1475 1476 if (bond->params.arp_interval) 1477 slave->dev->last_rx = jiffies; 1478 1479 recv_probe = ACCESS_ONCE(bond->recv_probe); 1480 if (recv_probe) { 1481 ret = recv_probe(skb, bond, slave); 1482 if (ret == RX_HANDLER_CONSUMED) { 1483 consume_skb(skb); 1484 return ret; 1485 } 1486 } 1487 1488 if (bond_should_deliver_exact_match(skb, slave, bond)) { 1489 return RX_HANDLER_EXACT; 1490 } 1491 1492 skb->dev = bond->dev; 1493 1494 if (bond->params.mode == BOND_MODE_ALB && 1495 bond->dev->priv_flags & IFF_BRIDGE_PORT && 1496 skb->pkt_type == PACKET_HOST) { 1497 1498 if (unlikely(skb_cow_head(skb, 1499 skb->data - skb_mac_header(skb)))) { 1500 kfree_skb(skb); 1501 return RX_HANDLER_CONSUMED; 1502 } 1503 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN); 1504 } 1505 1506 return ret; 1507 } 1508 1509 static int bond_master_upper_dev_link(struct net_device *bond_dev, 1510 struct net_device *slave_dev) 1511 { 1512 int err; 1513 1514 err = netdev_master_upper_dev_link(slave_dev, bond_dev); 1515 if (err) 1516 return err; 1517 slave_dev->flags |= IFF_SLAVE; 1518 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE); 1519 return 0; 1520 } 1521 1522 static void bond_upper_dev_unlink(struct net_device *bond_dev, 1523 struct net_device *slave_dev) 1524 { 1525 netdev_upper_dev_unlink(slave_dev, bond_dev); 1526 slave_dev->flags &= ~IFF_SLAVE; 1527 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE); 1528 } 1529 1530 /* enslave device <slave> to bond device <master> */ 1531 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev) 1532 { 1533 struct bonding *bond = netdev_priv(bond_dev); 1534 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1535 struct slave *new_slave = NULL; 1536 struct netdev_hw_addr *ha; 1537 struct sockaddr addr; 1538 int link_reporting; 1539 int res = 0; 1540 1541 if (!bond->params.use_carrier && 1542 slave_dev->ethtool_ops->get_link == NULL && 1543 slave_ops->ndo_do_ioctl == NULL) { 1544 pr_warning("%s: Warning: no link monitoring support for %s\n", 1545 bond_dev->name, slave_dev->name); 1546 } 1547 1548 /* already enslaved */ 1549 if (slave_dev->flags & IFF_SLAVE) { 1550 pr_debug("Error, Device was already enslaved\n"); 1551 return -EBUSY; 1552 } 1553 1554 /* vlan challenged mutual exclusion */ 1555 /* no need to lock since we're protected by rtnl_lock */ 1556 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1557 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name); 1558 if (vlan_uses_dev(bond_dev)) { 1559 pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n", 1560 bond_dev->name, slave_dev->name, bond_dev->name); 1561 return -EPERM; 1562 } else { 1563 pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n", 1564 bond_dev->name, slave_dev->name, 1565 slave_dev->name, bond_dev->name); 1566 } 1567 } else { 1568 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name); 1569 } 1570 1571 /* 1572 * Old ifenslave binaries are no longer supported. These can 1573 * be identified with moderate accuracy by the state of the slave: 1574 * the current ifenslave will set the interface down prior to 1575 * enslaving it; the old ifenslave will not. 1576 */ 1577 if ((slave_dev->flags & IFF_UP)) { 1578 pr_err("%s is up. This may be due to an out of date ifenslave.\n", 1579 slave_dev->name); 1580 res = -EPERM; 1581 goto err_undo_flags; 1582 } 1583 1584 /* set bonding device ether type by slave - bonding netdevices are 1585 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1586 * there is a need to override some of the type dependent attribs/funcs. 1587 * 1588 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1589 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1590 */ 1591 if (bond->slave_cnt == 0) { 1592 if (bond_dev->type != slave_dev->type) { 1593 pr_debug("%s: change device type from %d to %d\n", 1594 bond_dev->name, 1595 bond_dev->type, slave_dev->type); 1596 1597 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, 1598 bond_dev); 1599 res = notifier_to_errno(res); 1600 if (res) { 1601 pr_err("%s: refused to change device type\n", 1602 bond_dev->name); 1603 res = -EBUSY; 1604 goto err_undo_flags; 1605 } 1606 1607 /* Flush unicast and multicast addresses */ 1608 dev_uc_flush(bond_dev); 1609 dev_mc_flush(bond_dev); 1610 1611 if (slave_dev->type != ARPHRD_ETHER) 1612 bond_setup_by_slave(bond_dev, slave_dev); 1613 else { 1614 ether_setup(bond_dev); 1615 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1616 } 1617 1618 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, 1619 bond_dev); 1620 } 1621 } else if (bond_dev->type != slave_dev->type) { 1622 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n", 1623 slave_dev->name, 1624 slave_dev->type, bond_dev->type); 1625 res = -EINVAL; 1626 goto err_undo_flags; 1627 } 1628 1629 if (slave_ops->ndo_set_mac_address == NULL) { 1630 if (bond->slave_cnt == 0) { 1631 pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.", 1632 bond_dev->name); 1633 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1634 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1635 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", 1636 bond_dev->name); 1637 res = -EOPNOTSUPP; 1638 goto err_undo_flags; 1639 } 1640 } 1641 1642 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1643 1644 /* If this is the first slave, then we need to set the master's hardware 1645 * address to be the same as the slave's. */ 1646 if (bond->slave_cnt == 0 && bond->dev_addr_from_first) 1647 bond_set_dev_addr(bond->dev, slave_dev); 1648 1649 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL); 1650 if (!new_slave) { 1651 res = -ENOMEM; 1652 goto err_undo_flags; 1653 } 1654 1655 /* 1656 * Set the new_slave's queue_id to be zero. Queue ID mapping 1657 * is set via sysfs or module option if desired. 1658 */ 1659 new_slave->queue_id = 0; 1660 1661 /* Save slave's original mtu and then set it to match the bond */ 1662 new_slave->original_mtu = slave_dev->mtu; 1663 res = dev_set_mtu(slave_dev, bond->dev->mtu); 1664 if (res) { 1665 pr_debug("Error %d calling dev_set_mtu\n", res); 1666 goto err_free; 1667 } 1668 1669 /* 1670 * Save slave's original ("permanent") mac address for modes 1671 * that need it, and for restoring it upon release, and then 1672 * set it to the master's address 1673 */ 1674 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN); 1675 1676 if (!bond->params.fail_over_mac) { 1677 /* 1678 * Set slave to master's mac address. The application already 1679 * set the master's mac address to that of the first slave 1680 */ 1681 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 1682 addr.sa_family = slave_dev->type; 1683 res = dev_set_mac_address(slave_dev, &addr); 1684 if (res) { 1685 pr_debug("Error %d calling set_mac_address\n", res); 1686 goto err_restore_mtu; 1687 } 1688 } 1689 1690 res = bond_master_upper_dev_link(bond_dev, slave_dev); 1691 if (res) { 1692 pr_debug("Error %d calling bond_master_upper_dev_link\n", res); 1693 goto err_restore_mac; 1694 } 1695 1696 /* open the slave since the application closed it */ 1697 res = dev_open(slave_dev); 1698 if (res) { 1699 pr_debug("Opening slave %s failed\n", slave_dev->name); 1700 goto err_unset_master; 1701 } 1702 1703 new_slave->bond = bond; 1704 new_slave->dev = slave_dev; 1705 slave_dev->priv_flags |= IFF_BONDING; 1706 1707 if (bond_is_lb(bond)) { 1708 /* bond_alb_init_slave() must be called before all other stages since 1709 * it might fail and we do not want to have to undo everything 1710 */ 1711 res = bond_alb_init_slave(bond, new_slave); 1712 if (res) 1713 goto err_close; 1714 } 1715 1716 /* If the mode USES_PRIMARY, then the new slave gets the 1717 * master's promisc (and mc) settings only if it becomes the 1718 * curr_active_slave, and that is taken care of later when calling 1719 * bond_change_active() 1720 */ 1721 if (!USES_PRIMARY(bond->params.mode)) { 1722 /* set promiscuity level to new slave */ 1723 if (bond_dev->flags & IFF_PROMISC) { 1724 res = dev_set_promiscuity(slave_dev, 1); 1725 if (res) 1726 goto err_close; 1727 } 1728 1729 /* set allmulti level to new slave */ 1730 if (bond_dev->flags & IFF_ALLMULTI) { 1731 res = dev_set_allmulti(slave_dev, 1); 1732 if (res) 1733 goto err_close; 1734 } 1735 1736 netif_addr_lock_bh(bond_dev); 1737 /* upload master's mc_list to new slave */ 1738 netdev_for_each_mc_addr(ha, bond_dev) 1739 dev_mc_add(slave_dev, ha->addr); 1740 netif_addr_unlock_bh(bond_dev); 1741 } 1742 1743 if (bond->params.mode == BOND_MODE_8023AD) { 1744 /* add lacpdu mc addr to mc list */ 1745 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 1746 1747 dev_mc_add(slave_dev, lacpdu_multicast); 1748 } 1749 1750 bond_add_vlans_on_slave(bond, slave_dev); 1751 1752 write_lock_bh(&bond->lock); 1753 1754 bond_attach_slave(bond, new_slave); 1755 1756 new_slave->delay = 0; 1757 new_slave->link_failure_count = 0; 1758 1759 write_unlock_bh(&bond->lock); 1760 1761 bond_compute_features(bond); 1762 1763 bond_update_speed_duplex(new_slave); 1764 1765 read_lock(&bond->lock); 1766 1767 new_slave->last_arp_rx = jiffies - 1768 (msecs_to_jiffies(bond->params.arp_interval) + 1); 1769 1770 if (bond->params.miimon && !bond->params.use_carrier) { 1771 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 1772 1773 if ((link_reporting == -1) && !bond->params.arp_interval) { 1774 /* 1775 * miimon is set but a bonded network driver 1776 * does not support ETHTOOL/MII and 1777 * arp_interval is not set. Note: if 1778 * use_carrier is enabled, we will never go 1779 * here (because netif_carrier is always 1780 * supported); thus, we don't need to change 1781 * the messages for netif_carrier. 1782 */ 1783 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", 1784 bond_dev->name, slave_dev->name); 1785 } else if (link_reporting == -1) { 1786 /* unable get link status using mii/ethtool */ 1787 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", 1788 bond_dev->name, slave_dev->name); 1789 } 1790 } 1791 1792 /* check for initial state */ 1793 if (bond->params.miimon) { 1794 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { 1795 if (bond->params.updelay) { 1796 new_slave->link = BOND_LINK_BACK; 1797 new_slave->delay = bond->params.updelay; 1798 } else { 1799 new_slave->link = BOND_LINK_UP; 1800 } 1801 } else { 1802 new_slave->link = BOND_LINK_DOWN; 1803 } 1804 } else if (bond->params.arp_interval) { 1805 new_slave->link = (netif_carrier_ok(slave_dev) ? 1806 BOND_LINK_UP : BOND_LINK_DOWN); 1807 } else { 1808 new_slave->link = BOND_LINK_UP; 1809 } 1810 1811 if (new_slave->link != BOND_LINK_DOWN) 1812 new_slave->jiffies = jiffies; 1813 pr_debug("Initial state of slave_dev is BOND_LINK_%s\n", 1814 new_slave->link == BOND_LINK_DOWN ? "DOWN" : 1815 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); 1816 1817 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) { 1818 /* if there is a primary slave, remember it */ 1819 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 1820 bond->primary_slave = new_slave; 1821 bond->force_primary = true; 1822 } 1823 } 1824 1825 write_lock_bh(&bond->curr_slave_lock); 1826 1827 switch (bond->params.mode) { 1828 case BOND_MODE_ACTIVEBACKUP: 1829 bond_set_slave_inactive_flags(new_slave); 1830 bond_select_active_slave(bond); 1831 break; 1832 case BOND_MODE_8023AD: 1833 /* in 802.3ad mode, the internal mechanism 1834 * will activate the slaves in the selected 1835 * aggregator 1836 */ 1837 bond_set_slave_inactive_flags(new_slave); 1838 /* if this is the first slave */ 1839 if (bond->slave_cnt == 1) { 1840 SLAVE_AD_INFO(new_slave).id = 1; 1841 /* Initialize AD with the number of times that the AD timer is called in 1 second 1842 * can be called only after the mac address of the bond is set 1843 */ 1844 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL); 1845 } else { 1846 SLAVE_AD_INFO(new_slave).id = 1847 SLAVE_AD_INFO(new_slave->prev).id + 1; 1848 } 1849 1850 bond_3ad_bind_slave(new_slave); 1851 break; 1852 case BOND_MODE_TLB: 1853 case BOND_MODE_ALB: 1854 bond_set_active_slave(new_slave); 1855 bond_set_slave_inactive_flags(new_slave); 1856 bond_select_active_slave(bond); 1857 break; 1858 default: 1859 pr_debug("This slave is always active in trunk mode\n"); 1860 1861 /* always active in trunk mode */ 1862 bond_set_active_slave(new_slave); 1863 1864 /* In trunking mode there is little meaning to curr_active_slave 1865 * anyway (it holds no special properties of the bond device), 1866 * so we can change it without calling change_active_interface() 1867 */ 1868 if (!bond->curr_active_slave && new_slave->link == BOND_LINK_UP) 1869 bond->curr_active_slave = new_slave; 1870 1871 break; 1872 } /* switch(bond_mode) */ 1873 1874 write_unlock_bh(&bond->curr_slave_lock); 1875 1876 bond_set_carrier(bond); 1877 1878 #ifdef CONFIG_NET_POLL_CONTROLLER 1879 slave_dev->npinfo = bond_netpoll_info(bond); 1880 if (slave_dev->npinfo) { 1881 if (slave_enable_netpoll(new_slave)) { 1882 read_unlock(&bond->lock); 1883 pr_info("Error, %s: master_dev is using netpoll, " 1884 "but new slave device does not support netpoll.\n", 1885 bond_dev->name); 1886 res = -EBUSY; 1887 goto err_detach; 1888 } 1889 } 1890 #endif 1891 1892 read_unlock(&bond->lock); 1893 1894 res = bond_create_slave_symlinks(bond_dev, slave_dev); 1895 if (res) 1896 goto err_detach; 1897 1898 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 1899 new_slave); 1900 if (res) { 1901 pr_debug("Error %d calling netdev_rx_handler_register\n", res); 1902 goto err_dest_symlinks; 1903 } 1904 1905 pr_info("%s: enslaving %s as a%s interface with a%s link.\n", 1906 bond_dev->name, slave_dev->name, 1907 bond_is_active_slave(new_slave) ? "n active" : " backup", 1908 new_slave->link != BOND_LINK_DOWN ? "n up" : " down"); 1909 1910 /* enslave is successful */ 1911 return 0; 1912 1913 /* Undo stages on error */ 1914 err_dest_symlinks: 1915 bond_destroy_slave_symlinks(bond_dev, slave_dev); 1916 1917 err_detach: 1918 if (!USES_PRIMARY(bond->params.mode)) { 1919 netif_addr_lock_bh(bond_dev); 1920 bond_mc_list_flush(bond_dev, slave_dev); 1921 netif_addr_unlock_bh(bond_dev); 1922 } 1923 bond_del_vlans_from_slave(bond, slave_dev); 1924 write_lock_bh(&bond->lock); 1925 bond_detach_slave(bond, new_slave); 1926 if (bond->primary_slave == new_slave) 1927 bond->primary_slave = NULL; 1928 if (bond->curr_active_slave == new_slave) { 1929 bond_change_active_slave(bond, NULL); 1930 write_unlock_bh(&bond->lock); 1931 read_lock(&bond->lock); 1932 write_lock_bh(&bond->curr_slave_lock); 1933 bond_select_active_slave(bond); 1934 write_unlock_bh(&bond->curr_slave_lock); 1935 read_unlock(&bond->lock); 1936 } else { 1937 write_unlock_bh(&bond->lock); 1938 } 1939 slave_disable_netpoll(new_slave); 1940 1941 err_close: 1942 slave_dev->priv_flags &= ~IFF_BONDING; 1943 dev_close(slave_dev); 1944 1945 err_unset_master: 1946 bond_upper_dev_unlink(bond_dev, slave_dev); 1947 1948 err_restore_mac: 1949 if (!bond->params.fail_over_mac) { 1950 /* XXX TODO - fom follow mode needs to change master's 1951 * MAC if this slave's MAC is in use by the bond, or at 1952 * least print a warning. 1953 */ 1954 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN); 1955 addr.sa_family = slave_dev->type; 1956 dev_set_mac_address(slave_dev, &addr); 1957 } 1958 1959 err_restore_mtu: 1960 dev_set_mtu(slave_dev, new_slave->original_mtu); 1961 1962 err_free: 1963 kfree(new_slave); 1964 1965 err_undo_flags: 1966 bond_compute_features(bond); 1967 /* Enslave of first slave has failed and we need to fix master's mac */ 1968 if (bond->slave_cnt == 0 && 1969 ether_addr_equal(bond_dev->dev_addr, slave_dev->dev_addr)) 1970 eth_hw_addr_random(bond_dev); 1971 1972 return res; 1973 } 1974 1975 /* 1976 * Try to release the slave device <slave> from the bond device <master> 1977 * It is legal to access curr_active_slave without a lock because all the function 1978 * is write-locked. If "all" is true it means that the function is being called 1979 * while destroying a bond interface and all slaves are being released. 1980 * 1981 * The rules for slave state should be: 1982 * for Active/Backup: 1983 * Active stays on all backups go down 1984 * for Bonded connections: 1985 * The first up interface should be left on and all others downed. 1986 */ 1987 static int __bond_release_one(struct net_device *bond_dev, 1988 struct net_device *slave_dev, 1989 bool all) 1990 { 1991 struct bonding *bond = netdev_priv(bond_dev); 1992 struct slave *slave, *oldcurrent; 1993 struct sockaddr addr; 1994 netdev_features_t old_features = bond_dev->features; 1995 1996 /* slave is not a slave or master is not master of this slave */ 1997 if (!(slave_dev->flags & IFF_SLAVE) || 1998 !netdev_has_upper_dev(slave_dev, bond_dev)) { 1999 pr_err("%s: Error: cannot release %s.\n", 2000 bond_dev->name, slave_dev->name); 2001 return -EINVAL; 2002 } 2003 2004 block_netpoll_tx(); 2005 write_lock_bh(&bond->lock); 2006 2007 slave = bond_get_slave_by_dev(bond, slave_dev); 2008 if (!slave) { 2009 /* not a slave of this bond */ 2010 pr_info("%s: %s not enslaved\n", 2011 bond_dev->name, slave_dev->name); 2012 write_unlock_bh(&bond->lock); 2013 unblock_netpoll_tx(); 2014 return -EINVAL; 2015 } 2016 2017 write_unlock_bh(&bond->lock); 2018 /* unregister rx_handler early so bond_handle_frame wouldn't be called 2019 * for this slave anymore. 2020 */ 2021 netdev_rx_handler_unregister(slave_dev); 2022 write_lock_bh(&bond->lock); 2023 2024 if (!all && !bond->params.fail_over_mac) { 2025 if (ether_addr_equal(bond_dev->dev_addr, slave->perm_hwaddr) && 2026 bond->slave_cnt > 1) 2027 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", 2028 bond_dev->name, slave_dev->name, 2029 slave->perm_hwaddr, 2030 bond_dev->name, slave_dev->name); 2031 } 2032 2033 /* Inform AD package of unbinding of slave. */ 2034 if (bond->params.mode == BOND_MODE_8023AD) { 2035 /* must be called before the slave is 2036 * detached from the list 2037 */ 2038 bond_3ad_unbind_slave(slave); 2039 } 2040 2041 pr_info("%s: releasing %s interface %s\n", 2042 bond_dev->name, 2043 bond_is_active_slave(slave) ? "active" : "backup", 2044 slave_dev->name); 2045 2046 oldcurrent = bond->curr_active_slave; 2047 2048 bond->current_arp_slave = NULL; 2049 2050 /* release the slave from its bond */ 2051 bond_detach_slave(bond, slave); 2052 2053 if (bond->primary_slave == slave) 2054 bond->primary_slave = NULL; 2055 2056 if (oldcurrent == slave) 2057 bond_change_active_slave(bond, NULL); 2058 2059 if (bond_is_lb(bond)) { 2060 /* Must be called only after the slave has been 2061 * detached from the list and the curr_active_slave 2062 * has been cleared (if our_slave == old_current), 2063 * but before a new active slave is selected. 2064 */ 2065 write_unlock_bh(&bond->lock); 2066 bond_alb_deinit_slave(bond, slave); 2067 write_lock_bh(&bond->lock); 2068 } 2069 2070 if (all) { 2071 bond->curr_active_slave = NULL; 2072 } else if (oldcurrent == slave) { 2073 /* 2074 * Note that we hold RTNL over this sequence, so there 2075 * is no concern that another slave add/remove event 2076 * will interfere. 2077 */ 2078 write_unlock_bh(&bond->lock); 2079 read_lock(&bond->lock); 2080 write_lock_bh(&bond->curr_slave_lock); 2081 2082 bond_select_active_slave(bond); 2083 2084 write_unlock_bh(&bond->curr_slave_lock); 2085 read_unlock(&bond->lock); 2086 write_lock_bh(&bond->lock); 2087 } 2088 2089 if (bond->slave_cnt == 0) { 2090 bond_set_carrier(bond); 2091 eth_hw_addr_random(bond_dev); 2092 bond->dev_addr_from_first = true; 2093 2094 if (bond_vlan_used(bond)) { 2095 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n", 2096 bond_dev->name, bond_dev->name); 2097 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n", 2098 bond_dev->name); 2099 } 2100 } 2101 2102 write_unlock_bh(&bond->lock); 2103 unblock_netpoll_tx(); 2104 2105 if (bond->slave_cnt == 0) { 2106 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 2107 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev); 2108 } 2109 2110 bond_compute_features(bond); 2111 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 2112 (old_features & NETIF_F_VLAN_CHALLENGED)) 2113 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n", 2114 bond_dev->name, slave_dev->name, bond_dev->name); 2115 2116 /* must do this from outside any spinlocks */ 2117 bond_destroy_slave_symlinks(bond_dev, slave_dev); 2118 2119 bond_del_vlans_from_slave(bond, slave_dev); 2120 2121 /* If the mode USES_PRIMARY, then we should only remove its 2122 * promisc and mc settings if it was the curr_active_slave, but that was 2123 * already taken care of above when we detached the slave 2124 */ 2125 if (!USES_PRIMARY(bond->params.mode)) { 2126 /* unset promiscuity level from slave */ 2127 if (bond_dev->flags & IFF_PROMISC) 2128 dev_set_promiscuity(slave_dev, -1); 2129 2130 /* unset allmulti level from slave */ 2131 if (bond_dev->flags & IFF_ALLMULTI) 2132 dev_set_allmulti(slave_dev, -1); 2133 2134 /* flush master's mc_list from slave */ 2135 netif_addr_lock_bh(bond_dev); 2136 bond_mc_list_flush(bond_dev, slave_dev); 2137 netif_addr_unlock_bh(bond_dev); 2138 } 2139 2140 bond_upper_dev_unlink(bond_dev, slave_dev); 2141 2142 slave_disable_netpoll(slave); 2143 2144 /* close slave before restoring its mac address */ 2145 dev_close(slave_dev); 2146 2147 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 2148 /* restore original ("permanent") mac address */ 2149 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN); 2150 addr.sa_family = slave_dev->type; 2151 dev_set_mac_address(slave_dev, &addr); 2152 } 2153 2154 dev_set_mtu(slave_dev, slave->original_mtu); 2155 2156 slave_dev->priv_flags &= ~IFF_BONDING; 2157 2158 kfree(slave); 2159 2160 return 0; /* deletion OK */ 2161 } 2162 2163 /* A wrapper used because of ndo_del_link */ 2164 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 2165 { 2166 return __bond_release_one(bond_dev, slave_dev, false); 2167 } 2168 2169 /* 2170 * First release a slave and then destroy the bond if no more slaves are left. 2171 * Must be under rtnl_lock when this function is called. 2172 */ 2173 static int bond_release_and_destroy(struct net_device *bond_dev, 2174 struct net_device *slave_dev) 2175 { 2176 struct bonding *bond = netdev_priv(bond_dev); 2177 int ret; 2178 2179 ret = bond_release(bond_dev, slave_dev); 2180 if ((ret == 0) && (bond->slave_cnt == 0)) { 2181 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 2182 pr_info("%s: destroying bond %s.\n", 2183 bond_dev->name, bond_dev->name); 2184 unregister_netdevice(bond_dev); 2185 } 2186 return ret; 2187 } 2188 2189 /* 2190 * This function changes the active slave to slave <slave_dev>. 2191 * It returns -EINVAL in the following cases. 2192 * - <slave_dev> is not found in the list. 2193 * - There is not active slave now. 2194 * - <slave_dev> is already active. 2195 * - The link state of <slave_dev> is not BOND_LINK_UP. 2196 * - <slave_dev> is not running. 2197 * In these cases, this function does nothing. 2198 * In the other cases, current_slave pointer is changed and 0 is returned. 2199 */ 2200 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev) 2201 { 2202 struct bonding *bond = netdev_priv(bond_dev); 2203 struct slave *old_active = NULL; 2204 struct slave *new_active = NULL; 2205 int res = 0; 2206 2207 if (!USES_PRIMARY(bond->params.mode)) 2208 return -EINVAL; 2209 2210 /* Verify that bond_dev is indeed the master of slave_dev */ 2211 if (!(slave_dev->flags & IFF_SLAVE) || 2212 !netdev_has_upper_dev(slave_dev, bond_dev)) 2213 return -EINVAL; 2214 2215 read_lock(&bond->lock); 2216 2217 read_lock(&bond->curr_slave_lock); 2218 old_active = bond->curr_active_slave; 2219 read_unlock(&bond->curr_slave_lock); 2220 2221 new_active = bond_get_slave_by_dev(bond, slave_dev); 2222 2223 /* 2224 * Changing to the current active: do nothing; return success. 2225 */ 2226 if (new_active && (new_active == old_active)) { 2227 read_unlock(&bond->lock); 2228 return 0; 2229 } 2230 2231 if ((new_active) && 2232 (old_active) && 2233 (new_active->link == BOND_LINK_UP) && 2234 IS_UP(new_active->dev)) { 2235 block_netpoll_tx(); 2236 write_lock_bh(&bond->curr_slave_lock); 2237 bond_change_active_slave(bond, new_active); 2238 write_unlock_bh(&bond->curr_slave_lock); 2239 unblock_netpoll_tx(); 2240 } else 2241 res = -EINVAL; 2242 2243 read_unlock(&bond->lock); 2244 2245 return res; 2246 } 2247 2248 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info) 2249 { 2250 struct bonding *bond = netdev_priv(bond_dev); 2251 2252 info->bond_mode = bond->params.mode; 2253 info->miimon = bond->params.miimon; 2254 2255 read_lock(&bond->lock); 2256 info->num_slaves = bond->slave_cnt; 2257 read_unlock(&bond->lock); 2258 2259 return 0; 2260 } 2261 2262 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 2263 { 2264 struct bonding *bond = netdev_priv(bond_dev); 2265 struct slave *slave; 2266 int i, res = -ENODEV; 2267 2268 read_lock(&bond->lock); 2269 2270 bond_for_each_slave(bond, slave, i) { 2271 if (i == (int)info->slave_id) { 2272 res = 0; 2273 strcpy(info->slave_name, slave->dev->name); 2274 info->link = slave->link; 2275 info->state = bond_slave_state(slave); 2276 info->link_failure_count = slave->link_failure_count; 2277 break; 2278 } 2279 } 2280 2281 read_unlock(&bond->lock); 2282 2283 return res; 2284 } 2285 2286 /*-------------------------------- Monitoring -------------------------------*/ 2287 2288 2289 static int bond_miimon_inspect(struct bonding *bond) 2290 { 2291 struct slave *slave; 2292 int i, link_state, commit = 0; 2293 bool ignore_updelay; 2294 2295 ignore_updelay = !bond->curr_active_slave ? true : false; 2296 2297 bond_for_each_slave(bond, slave, i) { 2298 slave->new_link = BOND_LINK_NOCHANGE; 2299 2300 link_state = bond_check_dev_link(bond, slave->dev, 0); 2301 2302 switch (slave->link) { 2303 case BOND_LINK_UP: 2304 if (link_state) 2305 continue; 2306 2307 slave->link = BOND_LINK_FAIL; 2308 slave->delay = bond->params.downdelay; 2309 if (slave->delay) { 2310 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n", 2311 bond->dev->name, 2312 (bond->params.mode == 2313 BOND_MODE_ACTIVEBACKUP) ? 2314 (bond_is_active_slave(slave) ? 2315 "active " : "backup ") : "", 2316 slave->dev->name, 2317 bond->params.downdelay * bond->params.miimon); 2318 } 2319 /*FALLTHRU*/ 2320 case BOND_LINK_FAIL: 2321 if (link_state) { 2322 /* 2323 * recovered before downdelay expired 2324 */ 2325 slave->link = BOND_LINK_UP; 2326 slave->jiffies = jiffies; 2327 pr_info("%s: link status up again after %d ms for interface %s.\n", 2328 bond->dev->name, 2329 (bond->params.downdelay - slave->delay) * 2330 bond->params.miimon, 2331 slave->dev->name); 2332 continue; 2333 } 2334 2335 if (slave->delay <= 0) { 2336 slave->new_link = BOND_LINK_DOWN; 2337 commit++; 2338 continue; 2339 } 2340 2341 slave->delay--; 2342 break; 2343 2344 case BOND_LINK_DOWN: 2345 if (!link_state) 2346 continue; 2347 2348 slave->link = BOND_LINK_BACK; 2349 slave->delay = bond->params.updelay; 2350 2351 if (slave->delay) { 2352 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n", 2353 bond->dev->name, slave->dev->name, 2354 ignore_updelay ? 0 : 2355 bond->params.updelay * 2356 bond->params.miimon); 2357 } 2358 /*FALLTHRU*/ 2359 case BOND_LINK_BACK: 2360 if (!link_state) { 2361 slave->link = BOND_LINK_DOWN; 2362 pr_info("%s: link status down again after %d ms for interface %s.\n", 2363 bond->dev->name, 2364 (bond->params.updelay - slave->delay) * 2365 bond->params.miimon, 2366 slave->dev->name); 2367 2368 continue; 2369 } 2370 2371 if (ignore_updelay) 2372 slave->delay = 0; 2373 2374 if (slave->delay <= 0) { 2375 slave->new_link = BOND_LINK_UP; 2376 commit++; 2377 ignore_updelay = false; 2378 continue; 2379 } 2380 2381 slave->delay--; 2382 break; 2383 } 2384 } 2385 2386 return commit; 2387 } 2388 2389 static void bond_miimon_commit(struct bonding *bond) 2390 { 2391 struct slave *slave; 2392 int i; 2393 2394 bond_for_each_slave(bond, slave, i) { 2395 switch (slave->new_link) { 2396 case BOND_LINK_NOCHANGE: 2397 continue; 2398 2399 case BOND_LINK_UP: 2400 slave->link = BOND_LINK_UP; 2401 slave->jiffies = jiffies; 2402 2403 if (bond->params.mode == BOND_MODE_8023AD) { 2404 /* prevent it from being the active one */ 2405 bond_set_backup_slave(slave); 2406 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) { 2407 /* make it immediately active */ 2408 bond_set_active_slave(slave); 2409 } else if (slave != bond->primary_slave) { 2410 /* prevent it from being the active one */ 2411 bond_set_backup_slave(slave); 2412 } 2413 2414 pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n", 2415 bond->dev->name, slave->dev->name, 2416 slave->speed, slave->duplex ? "full" : "half"); 2417 2418 /* notify ad that the link status has changed */ 2419 if (bond->params.mode == BOND_MODE_8023AD) 2420 bond_3ad_handle_link_change(slave, BOND_LINK_UP); 2421 2422 if (bond_is_lb(bond)) 2423 bond_alb_handle_link_change(bond, slave, 2424 BOND_LINK_UP); 2425 2426 if (!bond->curr_active_slave || 2427 (slave == bond->primary_slave)) 2428 goto do_failover; 2429 2430 continue; 2431 2432 case BOND_LINK_DOWN: 2433 if (slave->link_failure_count < UINT_MAX) 2434 slave->link_failure_count++; 2435 2436 slave->link = BOND_LINK_DOWN; 2437 2438 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP || 2439 bond->params.mode == BOND_MODE_8023AD) 2440 bond_set_slave_inactive_flags(slave); 2441 2442 pr_info("%s: link status definitely down for interface %s, disabling it\n", 2443 bond->dev->name, slave->dev->name); 2444 2445 if (bond->params.mode == BOND_MODE_8023AD) 2446 bond_3ad_handle_link_change(slave, 2447 BOND_LINK_DOWN); 2448 2449 if (bond_is_lb(bond)) 2450 bond_alb_handle_link_change(bond, slave, 2451 BOND_LINK_DOWN); 2452 2453 if (slave == bond->curr_active_slave) 2454 goto do_failover; 2455 2456 continue; 2457 2458 default: 2459 pr_err("%s: invalid new link %d on slave %s\n", 2460 bond->dev->name, slave->new_link, 2461 slave->dev->name); 2462 slave->new_link = BOND_LINK_NOCHANGE; 2463 2464 continue; 2465 } 2466 2467 do_failover: 2468 ASSERT_RTNL(); 2469 block_netpoll_tx(); 2470 write_lock_bh(&bond->curr_slave_lock); 2471 bond_select_active_slave(bond); 2472 write_unlock_bh(&bond->curr_slave_lock); 2473 unblock_netpoll_tx(); 2474 } 2475 2476 bond_set_carrier(bond); 2477 } 2478 2479 /* 2480 * bond_mii_monitor 2481 * 2482 * Really a wrapper that splits the mii monitor into two phases: an 2483 * inspection, then (if inspection indicates something needs to be done) 2484 * an acquisition of appropriate locks followed by a commit phase to 2485 * implement whatever link state changes are indicated. 2486 */ 2487 void bond_mii_monitor(struct work_struct *work) 2488 { 2489 struct bonding *bond = container_of(work, struct bonding, 2490 mii_work.work); 2491 bool should_notify_peers = false; 2492 unsigned long delay; 2493 2494 read_lock(&bond->lock); 2495 2496 delay = msecs_to_jiffies(bond->params.miimon); 2497 2498 if (bond->slave_cnt == 0) 2499 goto re_arm; 2500 2501 should_notify_peers = bond_should_notify_peers(bond); 2502 2503 if (bond_miimon_inspect(bond)) { 2504 read_unlock(&bond->lock); 2505 2506 /* Race avoidance with bond_close cancel of workqueue */ 2507 if (!rtnl_trylock()) { 2508 read_lock(&bond->lock); 2509 delay = 1; 2510 should_notify_peers = false; 2511 goto re_arm; 2512 } 2513 2514 read_lock(&bond->lock); 2515 2516 bond_miimon_commit(bond); 2517 2518 read_unlock(&bond->lock); 2519 rtnl_unlock(); /* might sleep, hold no other locks */ 2520 read_lock(&bond->lock); 2521 } 2522 2523 re_arm: 2524 if (bond->params.miimon) 2525 queue_delayed_work(bond->wq, &bond->mii_work, delay); 2526 2527 read_unlock(&bond->lock); 2528 2529 if (should_notify_peers) { 2530 if (!rtnl_trylock()) { 2531 read_lock(&bond->lock); 2532 bond->send_peer_notif++; 2533 read_unlock(&bond->lock); 2534 return; 2535 } 2536 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); 2537 rtnl_unlock(); 2538 } 2539 } 2540 2541 static int bond_has_this_ip(struct bonding *bond, __be32 ip) 2542 { 2543 struct vlan_entry *vlan; 2544 struct net_device *vlan_dev; 2545 2546 if (ip == bond_confirm_addr(bond->dev, 0, ip)) 2547 return 1; 2548 2549 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 2550 rcu_read_lock(); 2551 vlan_dev = __vlan_find_dev_deep(bond->dev, htons(ETH_P_8021Q), 2552 vlan->vlan_id); 2553 rcu_read_unlock(); 2554 if (vlan_dev && ip == bond_confirm_addr(vlan_dev, 0, ip)) 2555 return 1; 2556 } 2557 2558 return 0; 2559 } 2560 2561 /* 2562 * We go to the (large) trouble of VLAN tagging ARP frames because 2563 * switches in VLAN mode (especially if ports are configured as 2564 * "native" to a VLAN) might not pass non-tagged frames. 2565 */ 2566 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id) 2567 { 2568 struct sk_buff *skb; 2569 2570 pr_debug("arp %d on slave %s: dst %pI4 src %pI4 vid %d\n", arp_op, 2571 slave_dev->name, &dest_ip, &src_ip, vlan_id); 2572 2573 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2574 NULL, slave_dev->dev_addr, NULL); 2575 2576 if (!skb) { 2577 pr_err("ARP packet allocation failed\n"); 2578 return; 2579 } 2580 if (vlan_id) { 2581 skb = vlan_put_tag(skb, htons(ETH_P_8021Q), vlan_id); 2582 if (!skb) { 2583 pr_err("failed to insert VLAN tag\n"); 2584 return; 2585 } 2586 } 2587 arp_xmit(skb); 2588 } 2589 2590 2591 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2592 { 2593 int i, vlan_id; 2594 __be32 *targets = bond->params.arp_targets; 2595 struct vlan_entry *vlan; 2596 struct net_device *vlan_dev = NULL; 2597 struct rtable *rt; 2598 2599 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) { 2600 __be32 addr; 2601 if (!targets[i]) 2602 break; 2603 pr_debug("basa: target %pI4\n", &targets[i]); 2604 if (!bond_vlan_used(bond)) { 2605 pr_debug("basa: empty vlan: arp_send\n"); 2606 addr = bond_confirm_addr(bond->dev, targets[i], 0); 2607 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2608 addr, 0); 2609 continue; 2610 } 2611 2612 /* 2613 * If VLANs are configured, we do a route lookup to 2614 * determine which VLAN interface would be used, so we 2615 * can tag the ARP with the proper VLAN tag. 2616 */ 2617 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 2618 RTO_ONLINK, 0); 2619 if (IS_ERR(rt)) { 2620 if (net_ratelimit()) { 2621 pr_warning("%s: no route to arp_ip_target %pI4\n", 2622 bond->dev->name, &targets[i]); 2623 } 2624 continue; 2625 } 2626 2627 /* 2628 * This target is not on a VLAN 2629 */ 2630 if (rt->dst.dev == bond->dev) { 2631 ip_rt_put(rt); 2632 pr_debug("basa: rtdev == bond->dev: arp_send\n"); 2633 addr = bond_confirm_addr(bond->dev, targets[i], 0); 2634 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2635 addr, 0); 2636 continue; 2637 } 2638 2639 vlan_id = 0; 2640 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { 2641 rcu_read_lock(); 2642 vlan_dev = __vlan_find_dev_deep(bond->dev, 2643 htons(ETH_P_8021Q), 2644 vlan->vlan_id); 2645 rcu_read_unlock(); 2646 if (vlan_dev == rt->dst.dev) { 2647 vlan_id = vlan->vlan_id; 2648 pr_debug("basa: vlan match on %s %d\n", 2649 vlan_dev->name, vlan_id); 2650 break; 2651 } 2652 } 2653 2654 if (vlan_id && vlan_dev) { 2655 ip_rt_put(rt); 2656 addr = bond_confirm_addr(vlan_dev, targets[i], 0); 2657 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i], 2658 addr, vlan_id); 2659 continue; 2660 } 2661 2662 if (net_ratelimit()) { 2663 pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n", 2664 bond->dev->name, &targets[i], 2665 rt->dst.dev ? rt->dst.dev->name : "NULL"); 2666 } 2667 ip_rt_put(rt); 2668 } 2669 } 2670 2671 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 2672 { 2673 int i; 2674 __be32 *targets = bond->params.arp_targets; 2675 2676 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) { 2677 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n", 2678 &sip, &tip, i, &targets[i], 2679 bond_has_this_ip(bond, tip)); 2680 if (sip == targets[i]) { 2681 if (bond_has_this_ip(bond, tip)) 2682 slave->last_arp_rx = jiffies; 2683 return; 2684 } 2685 } 2686 } 2687 2688 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, 2689 struct slave *slave) 2690 { 2691 struct arphdr *arp = (struct arphdr *)skb->data; 2692 unsigned char *arp_ptr; 2693 __be32 sip, tip; 2694 int alen; 2695 2696 if (skb->protocol != __cpu_to_be16(ETH_P_ARP)) 2697 return RX_HANDLER_ANOTHER; 2698 2699 read_lock(&bond->lock); 2700 alen = arp_hdr_len(bond->dev); 2701 2702 pr_debug("bond_arp_rcv: bond %s skb->dev %s\n", 2703 bond->dev->name, skb->dev->name); 2704 2705 if (alen > skb_headlen(skb)) { 2706 arp = kmalloc(alen, GFP_ATOMIC); 2707 if (!arp) 2708 goto out_unlock; 2709 if (skb_copy_bits(skb, 0, arp, alen) < 0) 2710 goto out_unlock; 2711 } 2712 2713 if (arp->ar_hln != bond->dev->addr_len || 2714 skb->pkt_type == PACKET_OTHERHOST || 2715 skb->pkt_type == PACKET_LOOPBACK || 2716 arp->ar_hrd != htons(ARPHRD_ETHER) || 2717 arp->ar_pro != htons(ETH_P_IP) || 2718 arp->ar_pln != 4) 2719 goto out_unlock; 2720 2721 arp_ptr = (unsigned char *)(arp + 1); 2722 arp_ptr += bond->dev->addr_len; 2723 memcpy(&sip, arp_ptr, 4); 2724 arp_ptr += 4 + bond->dev->addr_len; 2725 memcpy(&tip, arp_ptr, 4); 2726 2727 pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n", 2728 bond->dev->name, slave->dev->name, bond_slave_state(slave), 2729 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 2730 &sip, &tip); 2731 2732 /* 2733 * Backup slaves won't see the ARP reply, but do come through 2734 * here for each ARP probe (so we swap the sip/tip to validate 2735 * the probe). In a "redundant switch, common router" type of 2736 * configuration, the ARP probe will (hopefully) travel from 2737 * the active, through one switch, the router, then the other 2738 * switch before reaching the backup. 2739 */ 2740 if (bond_is_active_slave(slave)) 2741 bond_validate_arp(bond, slave, sip, tip); 2742 else 2743 bond_validate_arp(bond, slave, tip, sip); 2744 2745 out_unlock: 2746 read_unlock(&bond->lock); 2747 if (arp != (struct arphdr *)skb->data) 2748 kfree(arp); 2749 return RX_HANDLER_ANOTHER; 2750 } 2751 2752 /* 2753 * this function is called regularly to monitor each slave's link 2754 * ensuring that traffic is being sent and received when arp monitoring 2755 * is used in load-balancing mode. if the adapter has been dormant, then an 2756 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 2757 * arp monitoring in active backup mode. 2758 */ 2759 void bond_loadbalance_arp_mon(struct work_struct *work) 2760 { 2761 struct bonding *bond = container_of(work, struct bonding, 2762 arp_work.work); 2763 struct slave *slave, *oldcurrent; 2764 int do_failover = 0; 2765 int delta_in_ticks, extra_ticks; 2766 int i; 2767 2768 read_lock(&bond->lock); 2769 2770 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 2771 extra_ticks = delta_in_ticks / 2; 2772 2773 if (bond->slave_cnt == 0) 2774 goto re_arm; 2775 2776 read_lock(&bond->curr_slave_lock); 2777 oldcurrent = bond->curr_active_slave; 2778 read_unlock(&bond->curr_slave_lock); 2779 2780 /* see if any of the previous devices are up now (i.e. they have 2781 * xmt and rcv traffic). the curr_active_slave does not come into 2782 * the picture unless it is null. also, slave->jiffies is not needed 2783 * here because we send an arp on each slave and give a slave as 2784 * long as it needs to get the tx/rx within the delta. 2785 * TODO: what about up/down delay in arp mode? it wasn't here before 2786 * so it can wait 2787 */ 2788 bond_for_each_slave(bond, slave, i) { 2789 unsigned long trans_start = dev_trans_start(slave->dev); 2790 2791 if (slave->link != BOND_LINK_UP) { 2792 if (time_in_range(jiffies, 2793 trans_start - delta_in_ticks, 2794 trans_start + delta_in_ticks + extra_ticks) && 2795 time_in_range(jiffies, 2796 slave->dev->last_rx - delta_in_ticks, 2797 slave->dev->last_rx + delta_in_ticks + extra_ticks)) { 2798 2799 slave->link = BOND_LINK_UP; 2800 bond_set_active_slave(slave); 2801 2802 /* primary_slave has no meaning in round-robin 2803 * mode. the window of a slave being up and 2804 * curr_active_slave being null after enslaving 2805 * is closed. 2806 */ 2807 if (!oldcurrent) { 2808 pr_info("%s: link status definitely up for interface %s, ", 2809 bond->dev->name, 2810 slave->dev->name); 2811 do_failover = 1; 2812 } else { 2813 pr_info("%s: interface %s is now up\n", 2814 bond->dev->name, 2815 slave->dev->name); 2816 } 2817 } 2818 } else { 2819 /* slave->link == BOND_LINK_UP */ 2820 2821 /* not all switches will respond to an arp request 2822 * when the source ip is 0, so don't take the link down 2823 * if we don't know our ip yet 2824 */ 2825 if (!time_in_range(jiffies, 2826 trans_start - delta_in_ticks, 2827 trans_start + 2 * delta_in_ticks + extra_ticks) || 2828 !time_in_range(jiffies, 2829 slave->dev->last_rx - delta_in_ticks, 2830 slave->dev->last_rx + 2 * delta_in_ticks + extra_ticks)) { 2831 2832 slave->link = BOND_LINK_DOWN; 2833 bond_set_backup_slave(slave); 2834 2835 if (slave->link_failure_count < UINT_MAX) 2836 slave->link_failure_count++; 2837 2838 pr_info("%s: interface %s is now down.\n", 2839 bond->dev->name, 2840 slave->dev->name); 2841 2842 if (slave == oldcurrent) 2843 do_failover = 1; 2844 } 2845 } 2846 2847 /* note: if switch is in round-robin mode, all links 2848 * must tx arp to ensure all links rx an arp - otherwise 2849 * links may oscillate or not come up at all; if switch is 2850 * in something like xor mode, there is nothing we can 2851 * do - all replies will be rx'ed on same link causing slaves 2852 * to be unstable during low/no traffic periods 2853 */ 2854 if (IS_UP(slave->dev)) 2855 bond_arp_send_all(bond, slave); 2856 } 2857 2858 if (do_failover) { 2859 block_netpoll_tx(); 2860 write_lock_bh(&bond->curr_slave_lock); 2861 2862 bond_select_active_slave(bond); 2863 2864 write_unlock_bh(&bond->curr_slave_lock); 2865 unblock_netpoll_tx(); 2866 } 2867 2868 re_arm: 2869 if (bond->params.arp_interval) 2870 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 2871 2872 read_unlock(&bond->lock); 2873 } 2874 2875 /* 2876 * Called to inspect slaves for active-backup mode ARP monitor link state 2877 * changes. Sets new_link in slaves to specify what action should take 2878 * place for the slave. Returns 0 if no changes are found, >0 if changes 2879 * to link states must be committed. 2880 * 2881 * Called with bond->lock held for read. 2882 */ 2883 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks) 2884 { 2885 struct slave *slave; 2886 int i, commit = 0; 2887 unsigned long trans_start; 2888 int extra_ticks; 2889 2890 /* All the time comparisons below need some extra time. Otherwise, on 2891 * fast networks the ARP probe/reply may arrive within the same jiffy 2892 * as it was sent. Then, the next time the ARP monitor is run, one 2893 * arp_interval will already have passed in the comparisons. 2894 */ 2895 extra_ticks = delta_in_ticks / 2; 2896 2897 bond_for_each_slave(bond, slave, i) { 2898 slave->new_link = BOND_LINK_NOCHANGE; 2899 2900 if (slave->link != BOND_LINK_UP) { 2901 if (time_in_range(jiffies, 2902 slave_last_rx(bond, slave) - delta_in_ticks, 2903 slave_last_rx(bond, slave) + delta_in_ticks + extra_ticks)) { 2904 2905 slave->new_link = BOND_LINK_UP; 2906 commit++; 2907 } 2908 2909 continue; 2910 } 2911 2912 /* 2913 * Give slaves 2*delta after being enslaved or made 2914 * active. This avoids bouncing, as the last receive 2915 * times need a full ARP monitor cycle to be updated. 2916 */ 2917 if (time_in_range(jiffies, 2918 slave->jiffies - delta_in_ticks, 2919 slave->jiffies + 2 * delta_in_ticks + extra_ticks)) 2920 continue; 2921 2922 /* 2923 * Backup slave is down if: 2924 * - No current_arp_slave AND 2925 * - more than 3*delta since last receive AND 2926 * - the bond has an IP address 2927 * 2928 * Note: a non-null current_arp_slave indicates 2929 * the curr_active_slave went down and we are 2930 * searching for a new one; under this condition 2931 * we only take the curr_active_slave down - this 2932 * gives each slave a chance to tx/rx traffic 2933 * before being taken out 2934 */ 2935 if (!bond_is_active_slave(slave) && 2936 !bond->current_arp_slave && 2937 !time_in_range(jiffies, 2938 slave_last_rx(bond, slave) - delta_in_ticks, 2939 slave_last_rx(bond, slave) + 3 * delta_in_ticks + extra_ticks)) { 2940 2941 slave->new_link = BOND_LINK_DOWN; 2942 commit++; 2943 } 2944 2945 /* 2946 * Active slave is down if: 2947 * - more than 2*delta since transmitting OR 2948 * - (more than 2*delta since receive AND 2949 * the bond has an IP address) 2950 */ 2951 trans_start = dev_trans_start(slave->dev); 2952 if (bond_is_active_slave(slave) && 2953 (!time_in_range(jiffies, 2954 trans_start - delta_in_ticks, 2955 trans_start + 2 * delta_in_ticks + extra_ticks) || 2956 !time_in_range(jiffies, 2957 slave_last_rx(bond, slave) - delta_in_ticks, 2958 slave_last_rx(bond, slave) + 2 * delta_in_ticks + extra_ticks))) { 2959 2960 slave->new_link = BOND_LINK_DOWN; 2961 commit++; 2962 } 2963 } 2964 2965 return commit; 2966 } 2967 2968 /* 2969 * Called to commit link state changes noted by inspection step of 2970 * active-backup mode ARP monitor. 2971 * 2972 * Called with RTNL and bond->lock for read. 2973 */ 2974 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks) 2975 { 2976 struct slave *slave; 2977 int i; 2978 unsigned long trans_start; 2979 2980 bond_for_each_slave(bond, slave, i) { 2981 switch (slave->new_link) { 2982 case BOND_LINK_NOCHANGE: 2983 continue; 2984 2985 case BOND_LINK_UP: 2986 trans_start = dev_trans_start(slave->dev); 2987 if ((!bond->curr_active_slave && 2988 time_in_range(jiffies, 2989 trans_start - delta_in_ticks, 2990 trans_start + delta_in_ticks + delta_in_ticks / 2)) || 2991 bond->curr_active_slave != slave) { 2992 slave->link = BOND_LINK_UP; 2993 if (bond->current_arp_slave) { 2994 bond_set_slave_inactive_flags( 2995 bond->current_arp_slave); 2996 bond->current_arp_slave = NULL; 2997 } 2998 2999 pr_info("%s: link status definitely up for interface %s.\n", 3000 bond->dev->name, slave->dev->name); 3001 3002 if (!bond->curr_active_slave || 3003 (slave == bond->primary_slave)) 3004 goto do_failover; 3005 3006 } 3007 3008 continue; 3009 3010 case BOND_LINK_DOWN: 3011 if (slave->link_failure_count < UINT_MAX) 3012 slave->link_failure_count++; 3013 3014 slave->link = BOND_LINK_DOWN; 3015 bond_set_slave_inactive_flags(slave); 3016 3017 pr_info("%s: link status definitely down for interface %s, disabling it\n", 3018 bond->dev->name, slave->dev->name); 3019 3020 if (slave == bond->curr_active_slave) { 3021 bond->current_arp_slave = NULL; 3022 goto do_failover; 3023 } 3024 3025 continue; 3026 3027 default: 3028 pr_err("%s: impossible: new_link %d on slave %s\n", 3029 bond->dev->name, slave->new_link, 3030 slave->dev->name); 3031 continue; 3032 } 3033 3034 do_failover: 3035 ASSERT_RTNL(); 3036 block_netpoll_tx(); 3037 write_lock_bh(&bond->curr_slave_lock); 3038 bond_select_active_slave(bond); 3039 write_unlock_bh(&bond->curr_slave_lock); 3040 unblock_netpoll_tx(); 3041 } 3042 3043 bond_set_carrier(bond); 3044 } 3045 3046 /* 3047 * Send ARP probes for active-backup mode ARP monitor. 3048 * 3049 * Called with bond->lock held for read. 3050 */ 3051 static void bond_ab_arp_probe(struct bonding *bond) 3052 { 3053 struct slave *slave; 3054 int i; 3055 3056 read_lock(&bond->curr_slave_lock); 3057 3058 if (bond->current_arp_slave && bond->curr_active_slave) 3059 pr_info("PROBE: c_arp %s && cas %s BAD\n", 3060 bond->current_arp_slave->dev->name, 3061 bond->curr_active_slave->dev->name); 3062 3063 if (bond->curr_active_slave) { 3064 bond_arp_send_all(bond, bond->curr_active_slave); 3065 read_unlock(&bond->curr_slave_lock); 3066 return; 3067 } 3068 3069 read_unlock(&bond->curr_slave_lock); 3070 3071 /* if we don't have a curr_active_slave, search for the next available 3072 * backup slave from the current_arp_slave and make it the candidate 3073 * for becoming the curr_active_slave 3074 */ 3075 3076 if (!bond->current_arp_slave) { 3077 bond->current_arp_slave = bond->first_slave; 3078 if (!bond->current_arp_slave) 3079 return; 3080 } 3081 3082 bond_set_slave_inactive_flags(bond->current_arp_slave); 3083 3084 /* search for next candidate */ 3085 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) { 3086 if (IS_UP(slave->dev)) { 3087 slave->link = BOND_LINK_BACK; 3088 bond_set_slave_active_flags(slave); 3089 bond_arp_send_all(bond, slave); 3090 slave->jiffies = jiffies; 3091 bond->current_arp_slave = slave; 3092 break; 3093 } 3094 3095 /* if the link state is up at this point, we 3096 * mark it down - this can happen if we have 3097 * simultaneous link failures and 3098 * reselect_active_interface doesn't make this 3099 * one the current slave so it is still marked 3100 * up when it is actually down 3101 */ 3102 if (slave->link == BOND_LINK_UP) { 3103 slave->link = BOND_LINK_DOWN; 3104 if (slave->link_failure_count < UINT_MAX) 3105 slave->link_failure_count++; 3106 3107 bond_set_slave_inactive_flags(slave); 3108 3109 pr_info("%s: backup interface %s is now down.\n", 3110 bond->dev->name, slave->dev->name); 3111 } 3112 } 3113 } 3114 3115 void bond_activebackup_arp_mon(struct work_struct *work) 3116 { 3117 struct bonding *bond = container_of(work, struct bonding, 3118 arp_work.work); 3119 bool should_notify_peers = false; 3120 int delta_in_ticks; 3121 3122 read_lock(&bond->lock); 3123 3124 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3125 3126 if (bond->slave_cnt == 0) 3127 goto re_arm; 3128 3129 should_notify_peers = bond_should_notify_peers(bond); 3130 3131 if (bond_ab_arp_inspect(bond, delta_in_ticks)) { 3132 read_unlock(&bond->lock); 3133 3134 /* Race avoidance with bond_close flush of workqueue */ 3135 if (!rtnl_trylock()) { 3136 read_lock(&bond->lock); 3137 delta_in_ticks = 1; 3138 should_notify_peers = false; 3139 goto re_arm; 3140 } 3141 3142 read_lock(&bond->lock); 3143 3144 bond_ab_arp_commit(bond, delta_in_ticks); 3145 3146 read_unlock(&bond->lock); 3147 rtnl_unlock(); 3148 read_lock(&bond->lock); 3149 } 3150 3151 bond_ab_arp_probe(bond); 3152 3153 re_arm: 3154 if (bond->params.arp_interval) 3155 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 3156 3157 read_unlock(&bond->lock); 3158 3159 if (should_notify_peers) { 3160 if (!rtnl_trylock()) { 3161 read_lock(&bond->lock); 3162 bond->send_peer_notif++; 3163 read_unlock(&bond->lock); 3164 return; 3165 } 3166 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); 3167 rtnl_unlock(); 3168 } 3169 } 3170 3171 /*-------------------------- netdev event handling --------------------------*/ 3172 3173 /* 3174 * Change device name 3175 */ 3176 static int bond_event_changename(struct bonding *bond) 3177 { 3178 bond_remove_proc_entry(bond); 3179 bond_create_proc_entry(bond); 3180 3181 bond_debug_reregister(bond); 3182 3183 return NOTIFY_DONE; 3184 } 3185 3186 static int bond_master_netdev_event(unsigned long event, 3187 struct net_device *bond_dev) 3188 { 3189 struct bonding *event_bond = netdev_priv(bond_dev); 3190 3191 switch (event) { 3192 case NETDEV_CHANGENAME: 3193 return bond_event_changename(event_bond); 3194 case NETDEV_UNREGISTER: 3195 bond_remove_proc_entry(event_bond); 3196 break; 3197 case NETDEV_REGISTER: 3198 bond_create_proc_entry(event_bond); 3199 break; 3200 default: 3201 break; 3202 } 3203 3204 return NOTIFY_DONE; 3205 } 3206 3207 static int bond_slave_netdev_event(unsigned long event, 3208 struct net_device *slave_dev) 3209 { 3210 struct slave *slave = bond_slave_get_rtnl(slave_dev); 3211 struct bonding *bond; 3212 struct net_device *bond_dev; 3213 u32 old_speed; 3214 u8 old_duplex; 3215 3216 /* A netdev event can be generated while enslaving a device 3217 * before netdev_rx_handler_register is called in which case 3218 * slave will be NULL 3219 */ 3220 if (!slave) 3221 return NOTIFY_DONE; 3222 bond_dev = slave->bond->dev; 3223 bond = slave->bond; 3224 3225 switch (event) { 3226 case NETDEV_UNREGISTER: 3227 if (bond->setup_by_slave) 3228 bond_release_and_destroy(bond_dev, slave_dev); 3229 else 3230 bond_release(bond_dev, slave_dev); 3231 break; 3232 case NETDEV_UP: 3233 case NETDEV_CHANGE: 3234 old_speed = slave->speed; 3235 old_duplex = slave->duplex; 3236 3237 bond_update_speed_duplex(slave); 3238 3239 if (bond->params.mode == BOND_MODE_8023AD) { 3240 if (old_speed != slave->speed) 3241 bond_3ad_adapter_speed_changed(slave); 3242 if (old_duplex != slave->duplex) 3243 bond_3ad_adapter_duplex_changed(slave); 3244 } 3245 break; 3246 case NETDEV_DOWN: 3247 /* 3248 * ... Or is it this? 3249 */ 3250 break; 3251 case NETDEV_CHANGEMTU: 3252 /* 3253 * TODO: Should slaves be allowed to 3254 * independently alter their MTU? For 3255 * an active-backup bond, slaves need 3256 * not be the same type of device, so 3257 * MTUs may vary. For other modes, 3258 * slaves arguably should have the 3259 * same MTUs. To do this, we'd need to 3260 * take over the slave's change_mtu 3261 * function for the duration of their 3262 * servitude. 3263 */ 3264 break; 3265 case NETDEV_CHANGENAME: 3266 /* 3267 * TODO: handle changing the primary's name 3268 */ 3269 break; 3270 case NETDEV_FEAT_CHANGE: 3271 bond_compute_features(bond); 3272 break; 3273 default: 3274 break; 3275 } 3276 3277 return NOTIFY_DONE; 3278 } 3279 3280 /* 3281 * bond_netdev_event: handle netdev notifier chain events. 3282 * 3283 * This function receives events for the netdev chain. The caller (an 3284 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 3285 * locks for us to safely manipulate the slave devices (RTNL lock, 3286 * dev_probe_lock). 3287 */ 3288 static int bond_netdev_event(struct notifier_block *this, 3289 unsigned long event, void *ptr) 3290 { 3291 struct net_device *event_dev = (struct net_device *)ptr; 3292 3293 pr_debug("event_dev: %s, event: %lx\n", 3294 event_dev ? event_dev->name : "None", 3295 event); 3296 3297 if (!(event_dev->priv_flags & IFF_BONDING)) 3298 return NOTIFY_DONE; 3299 3300 if (event_dev->flags & IFF_MASTER) { 3301 pr_debug("IFF_MASTER\n"); 3302 return bond_master_netdev_event(event, event_dev); 3303 } 3304 3305 if (event_dev->flags & IFF_SLAVE) { 3306 pr_debug("IFF_SLAVE\n"); 3307 return bond_slave_netdev_event(event, event_dev); 3308 } 3309 3310 return NOTIFY_DONE; 3311 } 3312 3313 static struct notifier_block bond_netdev_notifier = { 3314 .notifier_call = bond_netdev_event, 3315 }; 3316 3317 /*---------------------------- Hashing Policies -----------------------------*/ 3318 3319 /* 3320 * Hash for the output device based upon layer 2 data 3321 */ 3322 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count) 3323 { 3324 struct ethhdr *data = (struct ethhdr *)skb->data; 3325 3326 if (skb_headlen(skb) >= offsetof(struct ethhdr, h_proto)) 3327 return (data->h_dest[5] ^ data->h_source[5]) % count; 3328 3329 return 0; 3330 } 3331 3332 /* 3333 * Hash for the output device based upon layer 2 and layer 3 data. If 3334 * the packet is not IP, fall back on bond_xmit_hash_policy_l2() 3335 */ 3336 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count) 3337 { 3338 const struct ethhdr *data; 3339 const struct iphdr *iph; 3340 const struct ipv6hdr *ipv6h; 3341 u32 v6hash; 3342 const __be32 *s, *d; 3343 3344 if (skb->protocol == htons(ETH_P_IP) && 3345 pskb_network_may_pull(skb, sizeof(*iph))) { 3346 iph = ip_hdr(skb); 3347 data = (struct ethhdr *)skb->data; 3348 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^ 3349 (data->h_dest[5] ^ data->h_source[5])) % count; 3350 } else if (skb->protocol == htons(ETH_P_IPV6) && 3351 pskb_network_may_pull(skb, sizeof(*ipv6h))) { 3352 ipv6h = ipv6_hdr(skb); 3353 data = (struct ethhdr *)skb->data; 3354 s = &ipv6h->saddr.s6_addr32[0]; 3355 d = &ipv6h->daddr.s6_addr32[0]; 3356 v6hash = (s[1] ^ d[1]) ^ (s[2] ^ d[2]) ^ (s[3] ^ d[3]); 3357 v6hash ^= (v6hash >> 24) ^ (v6hash >> 16) ^ (v6hash >> 8); 3358 return (v6hash ^ data->h_dest[5] ^ data->h_source[5]) % count; 3359 } 3360 3361 return bond_xmit_hash_policy_l2(skb, count); 3362 } 3363 3364 /* 3365 * Hash for the output device based upon layer 3 and layer 4 data. If 3366 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is 3367 * altogether not IP, fall back on bond_xmit_hash_policy_l2() 3368 */ 3369 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count) 3370 { 3371 u32 layer4_xor = 0; 3372 const struct iphdr *iph; 3373 const struct ipv6hdr *ipv6h; 3374 const __be32 *s, *d; 3375 const __be16 *l4 = NULL; 3376 __be16 _l4[2]; 3377 int noff = skb_network_offset(skb); 3378 int poff; 3379 3380 if (skb->protocol == htons(ETH_P_IP) && 3381 pskb_may_pull(skb, noff + sizeof(*iph))) { 3382 iph = ip_hdr(skb); 3383 poff = proto_ports_offset(iph->protocol); 3384 3385 if (!ip_is_fragment(iph) && poff >= 0) { 3386 l4 = skb_header_pointer(skb, noff + (iph->ihl << 2) + poff, 3387 sizeof(_l4), &_l4); 3388 if (l4) 3389 layer4_xor = ntohs(l4[0] ^ l4[1]); 3390 } 3391 return (layer4_xor ^ 3392 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count; 3393 } else if (skb->protocol == htons(ETH_P_IPV6) && 3394 pskb_may_pull(skb, noff + sizeof(*ipv6h))) { 3395 ipv6h = ipv6_hdr(skb); 3396 poff = proto_ports_offset(ipv6h->nexthdr); 3397 if (poff >= 0) { 3398 l4 = skb_header_pointer(skb, noff + sizeof(*ipv6h) + poff, 3399 sizeof(_l4), &_l4); 3400 if (l4) 3401 layer4_xor = ntohs(l4[0] ^ l4[1]); 3402 } 3403 s = &ipv6h->saddr.s6_addr32[0]; 3404 d = &ipv6h->daddr.s6_addr32[0]; 3405 layer4_xor ^= (s[1] ^ d[1]) ^ (s[2] ^ d[2]) ^ (s[3] ^ d[3]); 3406 layer4_xor ^= (layer4_xor >> 24) ^ (layer4_xor >> 16) ^ 3407 (layer4_xor >> 8); 3408 return layer4_xor % count; 3409 } 3410 3411 return bond_xmit_hash_policy_l2(skb, count); 3412 } 3413 3414 /*-------------------------- Device entry points ----------------------------*/ 3415 3416 static void bond_work_init_all(struct bonding *bond) 3417 { 3418 INIT_DELAYED_WORK(&bond->mcast_work, 3419 bond_resend_igmp_join_requests_delayed); 3420 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 3421 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 3422 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) 3423 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon); 3424 else 3425 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon); 3426 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 3427 } 3428 3429 static void bond_work_cancel_all(struct bonding *bond) 3430 { 3431 cancel_delayed_work_sync(&bond->mii_work); 3432 cancel_delayed_work_sync(&bond->arp_work); 3433 cancel_delayed_work_sync(&bond->alb_work); 3434 cancel_delayed_work_sync(&bond->ad_work); 3435 cancel_delayed_work_sync(&bond->mcast_work); 3436 } 3437 3438 static int bond_open(struct net_device *bond_dev) 3439 { 3440 struct bonding *bond = netdev_priv(bond_dev); 3441 struct slave *slave; 3442 int i; 3443 3444 /* reset slave->backup and slave->inactive */ 3445 read_lock(&bond->lock); 3446 if (bond->slave_cnt > 0) { 3447 read_lock(&bond->curr_slave_lock); 3448 bond_for_each_slave(bond, slave, i) { 3449 if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) 3450 && (slave != bond->curr_active_slave)) { 3451 bond_set_slave_inactive_flags(slave); 3452 } else { 3453 bond_set_slave_active_flags(slave); 3454 } 3455 } 3456 read_unlock(&bond->curr_slave_lock); 3457 } 3458 read_unlock(&bond->lock); 3459 3460 bond_work_init_all(bond); 3461 3462 if (bond_is_lb(bond)) { 3463 /* bond_alb_initialize must be called before the timer 3464 * is started. 3465 */ 3466 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) 3467 return -ENOMEM; 3468 queue_delayed_work(bond->wq, &bond->alb_work, 0); 3469 } 3470 3471 if (bond->params.miimon) /* link check interval, in milliseconds. */ 3472 queue_delayed_work(bond->wq, &bond->mii_work, 0); 3473 3474 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 3475 queue_delayed_work(bond->wq, &bond->arp_work, 0); 3476 if (bond->params.arp_validate) 3477 bond->recv_probe = bond_arp_rcv; 3478 } 3479 3480 if (bond->params.mode == BOND_MODE_8023AD) { 3481 queue_delayed_work(bond->wq, &bond->ad_work, 0); 3482 /* register to receive LACPDUs */ 3483 bond->recv_probe = bond_3ad_lacpdu_recv; 3484 bond_3ad_initiate_agg_selection(bond, 1); 3485 } 3486 3487 return 0; 3488 } 3489 3490 static int bond_close(struct net_device *bond_dev) 3491 { 3492 struct bonding *bond = netdev_priv(bond_dev); 3493 3494 write_lock_bh(&bond->lock); 3495 bond->send_peer_notif = 0; 3496 write_unlock_bh(&bond->lock); 3497 3498 bond_work_cancel_all(bond); 3499 if (bond_is_lb(bond)) { 3500 /* Must be called only after all 3501 * slaves have been released 3502 */ 3503 bond_alb_deinitialize(bond); 3504 } 3505 bond->recv_probe = NULL; 3506 3507 return 0; 3508 } 3509 3510 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev, 3511 struct rtnl_link_stats64 *stats) 3512 { 3513 struct bonding *bond = netdev_priv(bond_dev); 3514 struct rtnl_link_stats64 temp; 3515 struct slave *slave; 3516 int i; 3517 3518 memset(stats, 0, sizeof(*stats)); 3519 3520 read_lock_bh(&bond->lock); 3521 3522 bond_for_each_slave(bond, slave, i) { 3523 const struct rtnl_link_stats64 *sstats = 3524 dev_get_stats(slave->dev, &temp); 3525 3526 stats->rx_packets += sstats->rx_packets; 3527 stats->rx_bytes += sstats->rx_bytes; 3528 stats->rx_errors += sstats->rx_errors; 3529 stats->rx_dropped += sstats->rx_dropped; 3530 3531 stats->tx_packets += sstats->tx_packets; 3532 stats->tx_bytes += sstats->tx_bytes; 3533 stats->tx_errors += sstats->tx_errors; 3534 stats->tx_dropped += sstats->tx_dropped; 3535 3536 stats->multicast += sstats->multicast; 3537 stats->collisions += sstats->collisions; 3538 3539 stats->rx_length_errors += sstats->rx_length_errors; 3540 stats->rx_over_errors += sstats->rx_over_errors; 3541 stats->rx_crc_errors += sstats->rx_crc_errors; 3542 stats->rx_frame_errors += sstats->rx_frame_errors; 3543 stats->rx_fifo_errors += sstats->rx_fifo_errors; 3544 stats->rx_missed_errors += sstats->rx_missed_errors; 3545 3546 stats->tx_aborted_errors += sstats->tx_aborted_errors; 3547 stats->tx_carrier_errors += sstats->tx_carrier_errors; 3548 stats->tx_fifo_errors += sstats->tx_fifo_errors; 3549 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors; 3550 stats->tx_window_errors += sstats->tx_window_errors; 3551 } 3552 3553 read_unlock_bh(&bond->lock); 3554 3555 return stats; 3556 } 3557 3558 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 3559 { 3560 struct net_device *slave_dev = NULL; 3561 struct ifbond k_binfo; 3562 struct ifbond __user *u_binfo = NULL; 3563 struct ifslave k_sinfo; 3564 struct ifslave __user *u_sinfo = NULL; 3565 struct mii_ioctl_data *mii = NULL; 3566 struct net *net; 3567 int res = 0; 3568 3569 pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd); 3570 3571 switch (cmd) { 3572 case SIOCGMIIPHY: 3573 mii = if_mii(ifr); 3574 if (!mii) 3575 return -EINVAL; 3576 3577 mii->phy_id = 0; 3578 /* Fall Through */ 3579 case SIOCGMIIREG: 3580 /* 3581 * We do this again just in case we were called by SIOCGMIIREG 3582 * instead of SIOCGMIIPHY. 3583 */ 3584 mii = if_mii(ifr); 3585 if (!mii) 3586 return -EINVAL; 3587 3588 3589 if (mii->reg_num == 1) { 3590 struct bonding *bond = netdev_priv(bond_dev); 3591 mii->val_out = 0; 3592 read_lock(&bond->lock); 3593 read_lock(&bond->curr_slave_lock); 3594 if (netif_carrier_ok(bond->dev)) 3595 mii->val_out = BMSR_LSTATUS; 3596 3597 read_unlock(&bond->curr_slave_lock); 3598 read_unlock(&bond->lock); 3599 } 3600 3601 return 0; 3602 case BOND_INFO_QUERY_OLD: 3603 case SIOCBONDINFOQUERY: 3604 u_binfo = (struct ifbond __user *)ifr->ifr_data; 3605 3606 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 3607 return -EFAULT; 3608 3609 res = bond_info_query(bond_dev, &k_binfo); 3610 if (res == 0 && 3611 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 3612 return -EFAULT; 3613 3614 return res; 3615 case BOND_SLAVE_INFO_QUERY_OLD: 3616 case SIOCBONDSLAVEINFOQUERY: 3617 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 3618 3619 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 3620 return -EFAULT; 3621 3622 res = bond_slave_info_query(bond_dev, &k_sinfo); 3623 if (res == 0 && 3624 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 3625 return -EFAULT; 3626 3627 return res; 3628 default: 3629 /* Go on */ 3630 break; 3631 } 3632 3633 net = dev_net(bond_dev); 3634 3635 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3636 return -EPERM; 3637 3638 slave_dev = dev_get_by_name(net, ifr->ifr_slave); 3639 3640 pr_debug("slave_dev=%p:\n", slave_dev); 3641 3642 if (!slave_dev) 3643 res = -ENODEV; 3644 else { 3645 pr_debug("slave_dev->name=%s:\n", slave_dev->name); 3646 switch (cmd) { 3647 case BOND_ENSLAVE_OLD: 3648 case SIOCBONDENSLAVE: 3649 res = bond_enslave(bond_dev, slave_dev); 3650 break; 3651 case BOND_RELEASE_OLD: 3652 case SIOCBONDRELEASE: 3653 res = bond_release(bond_dev, slave_dev); 3654 break; 3655 case BOND_SETHWADDR_OLD: 3656 case SIOCBONDSETHWADDR: 3657 bond_set_dev_addr(bond_dev, slave_dev); 3658 res = 0; 3659 break; 3660 case BOND_CHANGE_ACTIVE_OLD: 3661 case SIOCBONDCHANGEACTIVE: 3662 res = bond_ioctl_change_active(bond_dev, slave_dev); 3663 break; 3664 default: 3665 res = -EOPNOTSUPP; 3666 } 3667 3668 dev_put(slave_dev); 3669 } 3670 3671 return res; 3672 } 3673 3674 static bool bond_addr_in_mc_list(unsigned char *addr, 3675 struct netdev_hw_addr_list *list, 3676 int addrlen) 3677 { 3678 struct netdev_hw_addr *ha; 3679 3680 netdev_hw_addr_list_for_each(ha, list) 3681 if (!memcmp(ha->addr, addr, addrlen)) 3682 return true; 3683 3684 return false; 3685 } 3686 3687 static void bond_change_rx_flags(struct net_device *bond_dev, int change) 3688 { 3689 struct bonding *bond = netdev_priv(bond_dev); 3690 3691 if (change & IFF_PROMISC) 3692 bond_set_promiscuity(bond, 3693 bond_dev->flags & IFF_PROMISC ? 1 : -1); 3694 3695 if (change & IFF_ALLMULTI) 3696 bond_set_allmulti(bond, 3697 bond_dev->flags & IFF_ALLMULTI ? 1 : -1); 3698 } 3699 3700 static void bond_set_multicast_list(struct net_device *bond_dev) 3701 { 3702 struct bonding *bond = netdev_priv(bond_dev); 3703 struct netdev_hw_addr *ha; 3704 bool found; 3705 3706 read_lock(&bond->lock); 3707 3708 /* looking for addresses to add to slaves' mc list */ 3709 netdev_for_each_mc_addr(ha, bond_dev) { 3710 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list, 3711 bond_dev->addr_len); 3712 if (!found) 3713 bond_mc_add(bond, ha->addr); 3714 } 3715 3716 /* looking for addresses to delete from slaves' list */ 3717 netdev_hw_addr_list_for_each(ha, &bond->mc_list) { 3718 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc, 3719 bond_dev->addr_len); 3720 if (!found) 3721 bond_mc_del(bond, ha->addr); 3722 } 3723 3724 /* save master's multicast list */ 3725 __hw_addr_flush(&bond->mc_list); 3726 __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc, 3727 bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST); 3728 3729 read_unlock(&bond->lock); 3730 } 3731 3732 static int bond_neigh_init(struct neighbour *n) 3733 { 3734 struct bonding *bond = netdev_priv(n->dev); 3735 struct slave *slave = bond->first_slave; 3736 const struct net_device_ops *slave_ops; 3737 struct neigh_parms parms; 3738 int ret; 3739 3740 if (!slave) 3741 return 0; 3742 3743 slave_ops = slave->dev->netdev_ops; 3744 3745 if (!slave_ops->ndo_neigh_setup) 3746 return 0; 3747 3748 parms.neigh_setup = NULL; 3749 parms.neigh_cleanup = NULL; 3750 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); 3751 if (ret) 3752 return ret; 3753 3754 /* 3755 * Assign slave's neigh_cleanup to neighbour in case cleanup is called 3756 * after the last slave has been detached. Assumes that all slaves 3757 * utilize the same neigh_cleanup (true at this writing as only user 3758 * is ipoib). 3759 */ 3760 n->parms->neigh_cleanup = parms.neigh_cleanup; 3761 3762 if (!parms.neigh_setup) 3763 return 0; 3764 3765 return parms.neigh_setup(n); 3766 } 3767 3768 /* 3769 * The bonding ndo_neigh_setup is called at init time beofre any 3770 * slave exists. So we must declare proxy setup function which will 3771 * be used at run time to resolve the actual slave neigh param setup. 3772 */ 3773 static int bond_neigh_setup(struct net_device *dev, 3774 struct neigh_parms *parms) 3775 { 3776 parms->neigh_setup = bond_neigh_init; 3777 3778 return 0; 3779 } 3780 3781 /* 3782 * Change the MTU of all of a master's slaves to match the master 3783 */ 3784 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 3785 { 3786 struct bonding *bond = netdev_priv(bond_dev); 3787 struct slave *slave, *stop_at; 3788 int res = 0; 3789 int i; 3790 3791 pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond, 3792 (bond_dev ? bond_dev->name : "None"), new_mtu); 3793 3794 /* Can't hold bond->lock with bh disabled here since 3795 * some base drivers panic. On the other hand we can't 3796 * hold bond->lock without bh disabled because we'll 3797 * deadlock. The only solution is to rely on the fact 3798 * that we're under rtnl_lock here, and the slaves 3799 * list won't change. This doesn't solve the problem 3800 * of setting the slave's MTU while it is 3801 * transmitting, but the assumption is that the base 3802 * driver can handle that. 3803 * 3804 * TODO: figure out a way to safely iterate the slaves 3805 * list, but without holding a lock around the actual 3806 * call to the base driver. 3807 */ 3808 3809 bond_for_each_slave(bond, slave, i) { 3810 pr_debug("s %p s->p %p c_m %p\n", 3811 slave, 3812 slave->prev, 3813 slave->dev->netdev_ops->ndo_change_mtu); 3814 3815 res = dev_set_mtu(slave->dev, new_mtu); 3816 3817 if (res) { 3818 /* If we failed to set the slave's mtu to the new value 3819 * we must abort the operation even in ACTIVE_BACKUP 3820 * mode, because if we allow the backup slaves to have 3821 * different mtu values than the active slave we'll 3822 * need to change their mtu when doing a failover. That 3823 * means changing their mtu from timer context, which 3824 * is probably not a good idea. 3825 */ 3826 pr_debug("err %d %s\n", res, slave->dev->name); 3827 goto unwind; 3828 } 3829 } 3830 3831 bond_dev->mtu = new_mtu; 3832 3833 return 0; 3834 3835 unwind: 3836 /* unwind from head to the slave that failed */ 3837 stop_at = slave; 3838 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { 3839 int tmp_res; 3840 3841 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu); 3842 if (tmp_res) { 3843 pr_debug("unwind err %d dev %s\n", 3844 tmp_res, slave->dev->name); 3845 } 3846 } 3847 3848 return res; 3849 } 3850 3851 /* 3852 * Change HW address 3853 * 3854 * Note that many devices must be down to change the HW address, and 3855 * downing the master releases all slaves. We can make bonds full of 3856 * bonding devices to test this, however. 3857 */ 3858 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 3859 { 3860 struct bonding *bond = netdev_priv(bond_dev); 3861 struct sockaddr *sa = addr, tmp_sa; 3862 struct slave *slave, *stop_at; 3863 int res = 0; 3864 int i; 3865 3866 if (bond->params.mode == BOND_MODE_ALB) 3867 return bond_alb_set_mac_address(bond_dev, addr); 3868 3869 3870 pr_debug("bond=%p, name=%s\n", 3871 bond, bond_dev ? bond_dev->name : "None"); 3872 3873 /* 3874 * If fail_over_mac is set to active, do nothing and return 3875 * success. Returning an error causes ifenslave to fail. 3876 */ 3877 if (bond->params.fail_over_mac == BOND_FOM_ACTIVE) 3878 return 0; 3879 3880 if (!is_valid_ether_addr(sa->sa_data)) 3881 return -EADDRNOTAVAIL; 3882 3883 /* Can't hold bond->lock with bh disabled here since 3884 * some base drivers panic. On the other hand we can't 3885 * hold bond->lock without bh disabled because we'll 3886 * deadlock. The only solution is to rely on the fact 3887 * that we're under rtnl_lock here, and the slaves 3888 * list won't change. This doesn't solve the problem 3889 * of setting the slave's hw address while it is 3890 * transmitting, but the assumption is that the base 3891 * driver can handle that. 3892 * 3893 * TODO: figure out a way to safely iterate the slaves 3894 * list, but without holding a lock around the actual 3895 * call to the base driver. 3896 */ 3897 3898 bond_for_each_slave(bond, slave, i) { 3899 const struct net_device_ops *slave_ops = slave->dev->netdev_ops; 3900 pr_debug("slave %p %s\n", slave, slave->dev->name); 3901 3902 if (slave_ops->ndo_set_mac_address == NULL) { 3903 res = -EOPNOTSUPP; 3904 pr_debug("EOPNOTSUPP %s\n", slave->dev->name); 3905 goto unwind; 3906 } 3907 3908 res = dev_set_mac_address(slave->dev, addr); 3909 if (res) { 3910 /* TODO: consider downing the slave 3911 * and retry ? 3912 * User should expect communications 3913 * breakage anyway until ARP finish 3914 * updating, so... 3915 */ 3916 pr_debug("err %d %s\n", res, slave->dev->name); 3917 goto unwind; 3918 } 3919 } 3920 3921 /* success */ 3922 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len); 3923 return 0; 3924 3925 unwind: 3926 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len); 3927 tmp_sa.sa_family = bond_dev->type; 3928 3929 /* unwind from head to the slave that failed */ 3930 stop_at = slave; 3931 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) { 3932 int tmp_res; 3933 3934 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa); 3935 if (tmp_res) { 3936 pr_debug("unwind err %d dev %s\n", 3937 tmp_res, slave->dev->name); 3938 } 3939 } 3940 3941 return res; 3942 } 3943 3944 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev) 3945 { 3946 struct bonding *bond = netdev_priv(bond_dev); 3947 struct slave *slave, *start_at; 3948 int i, slave_no, res = 1; 3949 struct iphdr *iph = ip_hdr(skb); 3950 3951 /* 3952 * Start with the curr_active_slave that joined the bond as the 3953 * default for sending IGMP traffic. For failover purposes one 3954 * needs to maintain some consistency for the interface that will 3955 * send the join/membership reports. The curr_active_slave found 3956 * will send all of this type of traffic. 3957 */ 3958 if ((iph->protocol == IPPROTO_IGMP) && 3959 (skb->protocol == htons(ETH_P_IP))) { 3960 3961 read_lock(&bond->curr_slave_lock); 3962 slave = bond->curr_active_slave; 3963 read_unlock(&bond->curr_slave_lock); 3964 3965 if (!slave) 3966 goto out; 3967 } else { 3968 /* 3969 * Concurrent TX may collide on rr_tx_counter; we accept 3970 * that as being rare enough not to justify using an 3971 * atomic op here. 3972 */ 3973 slave_no = bond->rr_tx_counter++ % bond->slave_cnt; 3974 3975 bond_for_each_slave(bond, slave, i) { 3976 slave_no--; 3977 if (slave_no < 0) 3978 break; 3979 } 3980 } 3981 3982 start_at = slave; 3983 bond_for_each_slave_from(bond, slave, i, start_at) { 3984 if (IS_UP(slave->dev) && 3985 (slave->link == BOND_LINK_UP) && 3986 bond_is_active_slave(slave)) { 3987 res = bond_dev_queue_xmit(bond, skb, slave->dev); 3988 break; 3989 } 3990 } 3991 3992 out: 3993 if (res) { 3994 /* no suitable interface, frame not sent */ 3995 kfree_skb(skb); 3996 } 3997 3998 return NETDEV_TX_OK; 3999 } 4000 4001 4002 /* 4003 * in active-backup mode, we know that bond->curr_active_slave is always valid if 4004 * the bond has a usable interface. 4005 */ 4006 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev) 4007 { 4008 struct bonding *bond = netdev_priv(bond_dev); 4009 int res = 1; 4010 4011 read_lock(&bond->curr_slave_lock); 4012 4013 if (bond->curr_active_slave) 4014 res = bond_dev_queue_xmit(bond, skb, 4015 bond->curr_active_slave->dev); 4016 4017 read_unlock(&bond->curr_slave_lock); 4018 4019 if (res) 4020 /* no suitable interface, frame not sent */ 4021 kfree_skb(skb); 4022 4023 return NETDEV_TX_OK; 4024 } 4025 4026 /* 4027 * In bond_xmit_xor() , we determine the output device by using a pre- 4028 * determined xmit_hash_policy(), If the selected device is not enabled, 4029 * find the next active slave. 4030 */ 4031 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev) 4032 { 4033 struct bonding *bond = netdev_priv(bond_dev); 4034 struct slave *slave, *start_at; 4035 int slave_no; 4036 int i; 4037 int res = 1; 4038 4039 slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt); 4040 4041 bond_for_each_slave(bond, slave, i) { 4042 slave_no--; 4043 if (slave_no < 0) 4044 break; 4045 } 4046 4047 start_at = slave; 4048 4049 bond_for_each_slave_from(bond, slave, i, start_at) { 4050 if (IS_UP(slave->dev) && 4051 (slave->link == BOND_LINK_UP) && 4052 bond_is_active_slave(slave)) { 4053 res = bond_dev_queue_xmit(bond, skb, slave->dev); 4054 break; 4055 } 4056 } 4057 4058 if (res) { 4059 /* no suitable interface, frame not sent */ 4060 kfree_skb(skb); 4061 } 4062 4063 return NETDEV_TX_OK; 4064 } 4065 4066 /* 4067 * in broadcast mode, we send everything to all usable interfaces. 4068 */ 4069 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev) 4070 { 4071 struct bonding *bond = netdev_priv(bond_dev); 4072 struct slave *slave, *start_at; 4073 struct net_device *tx_dev = NULL; 4074 int i; 4075 int res = 1; 4076 4077 read_lock(&bond->curr_slave_lock); 4078 start_at = bond->curr_active_slave; 4079 read_unlock(&bond->curr_slave_lock); 4080 4081 if (!start_at) 4082 goto out; 4083 4084 bond_for_each_slave_from(bond, slave, i, start_at) { 4085 if (IS_UP(slave->dev) && 4086 (slave->link == BOND_LINK_UP) && 4087 bond_is_active_slave(slave)) { 4088 if (tx_dev) { 4089 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 4090 if (!skb2) { 4091 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n", 4092 bond_dev->name); 4093 continue; 4094 } 4095 4096 res = bond_dev_queue_xmit(bond, skb2, tx_dev); 4097 if (res) { 4098 kfree_skb(skb2); 4099 continue; 4100 } 4101 } 4102 tx_dev = slave->dev; 4103 } 4104 } 4105 4106 if (tx_dev) 4107 res = bond_dev_queue_xmit(bond, skb, tx_dev); 4108 4109 out: 4110 if (res) 4111 /* no suitable interface, frame not sent */ 4112 kfree_skb(skb); 4113 4114 /* frame sent to all suitable interfaces */ 4115 return NETDEV_TX_OK; 4116 } 4117 4118 /*------------------------- Device initialization ---------------------------*/ 4119 4120 static void bond_set_xmit_hash_policy(struct bonding *bond) 4121 { 4122 switch (bond->params.xmit_policy) { 4123 case BOND_XMIT_POLICY_LAYER23: 4124 bond->xmit_hash_policy = bond_xmit_hash_policy_l23; 4125 break; 4126 case BOND_XMIT_POLICY_LAYER34: 4127 bond->xmit_hash_policy = bond_xmit_hash_policy_l34; 4128 break; 4129 case BOND_XMIT_POLICY_LAYER2: 4130 default: 4131 bond->xmit_hash_policy = bond_xmit_hash_policy_l2; 4132 break; 4133 } 4134 } 4135 4136 /* 4137 * Lookup the slave that corresponds to a qid 4138 */ 4139 static inline int bond_slave_override(struct bonding *bond, 4140 struct sk_buff *skb) 4141 { 4142 int i, res = 1; 4143 struct slave *slave = NULL; 4144 struct slave *check_slave; 4145 4146 if (!skb->queue_mapping) 4147 return 1; 4148 4149 /* Find out if any slaves have the same mapping as this skb. */ 4150 bond_for_each_slave(bond, check_slave, i) { 4151 if (check_slave->queue_id == skb->queue_mapping) { 4152 slave = check_slave; 4153 break; 4154 } 4155 } 4156 4157 /* If the slave isn't UP, use default transmit policy. */ 4158 if (slave && slave->queue_id && IS_UP(slave->dev) && 4159 (slave->link == BOND_LINK_UP)) { 4160 res = bond_dev_queue_xmit(bond, skb, slave->dev); 4161 } 4162 4163 return res; 4164 } 4165 4166 4167 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb) 4168 { 4169 /* 4170 * This helper function exists to help dev_pick_tx get the correct 4171 * destination queue. Using a helper function skips a call to 4172 * skb_tx_hash and will put the skbs in the queue we expect on their 4173 * way down to the bonding driver. 4174 */ 4175 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 4176 4177 /* 4178 * Save the original txq to restore before passing to the driver 4179 */ 4180 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping; 4181 4182 if (unlikely(txq >= dev->real_num_tx_queues)) { 4183 do { 4184 txq -= dev->real_num_tx_queues; 4185 } while (txq >= dev->real_num_tx_queues); 4186 } 4187 return txq; 4188 } 4189 4190 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4191 { 4192 struct bonding *bond = netdev_priv(dev); 4193 4194 if (TX_QUEUE_OVERRIDE(bond->params.mode)) { 4195 if (!bond_slave_override(bond, skb)) 4196 return NETDEV_TX_OK; 4197 } 4198 4199 switch (bond->params.mode) { 4200 case BOND_MODE_ROUNDROBIN: 4201 return bond_xmit_roundrobin(skb, dev); 4202 case BOND_MODE_ACTIVEBACKUP: 4203 return bond_xmit_activebackup(skb, dev); 4204 case BOND_MODE_XOR: 4205 return bond_xmit_xor(skb, dev); 4206 case BOND_MODE_BROADCAST: 4207 return bond_xmit_broadcast(skb, dev); 4208 case BOND_MODE_8023AD: 4209 return bond_3ad_xmit_xor(skb, dev); 4210 case BOND_MODE_ALB: 4211 case BOND_MODE_TLB: 4212 return bond_alb_xmit(skb, dev); 4213 default: 4214 /* Should never happen, mode already checked */ 4215 pr_err("%s: Error: Unknown bonding mode %d\n", 4216 dev->name, bond->params.mode); 4217 WARN_ON_ONCE(1); 4218 kfree_skb(skb); 4219 return NETDEV_TX_OK; 4220 } 4221 } 4222 4223 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 4224 { 4225 struct bonding *bond = netdev_priv(dev); 4226 netdev_tx_t ret = NETDEV_TX_OK; 4227 4228 /* 4229 * If we risk deadlock from transmitting this in the 4230 * netpoll path, tell netpoll to queue the frame for later tx 4231 */ 4232 if (is_netpoll_tx_blocked(dev)) 4233 return NETDEV_TX_BUSY; 4234 4235 read_lock(&bond->lock); 4236 4237 if (bond->slave_cnt) 4238 ret = __bond_start_xmit(skb, dev); 4239 else 4240 kfree_skb(skb); 4241 4242 read_unlock(&bond->lock); 4243 4244 return ret; 4245 } 4246 4247 /* 4248 * set bond mode specific net device operations 4249 */ 4250 void bond_set_mode_ops(struct bonding *bond, int mode) 4251 { 4252 struct net_device *bond_dev = bond->dev; 4253 4254 switch (mode) { 4255 case BOND_MODE_ROUNDROBIN: 4256 break; 4257 case BOND_MODE_ACTIVEBACKUP: 4258 break; 4259 case BOND_MODE_XOR: 4260 bond_set_xmit_hash_policy(bond); 4261 break; 4262 case BOND_MODE_BROADCAST: 4263 break; 4264 case BOND_MODE_8023AD: 4265 bond_set_xmit_hash_policy(bond); 4266 break; 4267 case BOND_MODE_ALB: 4268 /* FALLTHRU */ 4269 case BOND_MODE_TLB: 4270 break; 4271 default: 4272 /* Should never happen, mode already checked */ 4273 pr_err("%s: Error: Unknown bonding mode %d\n", 4274 bond_dev->name, mode); 4275 break; 4276 } 4277 } 4278 4279 static int bond_ethtool_get_settings(struct net_device *bond_dev, 4280 struct ethtool_cmd *ecmd) 4281 { 4282 struct bonding *bond = netdev_priv(bond_dev); 4283 struct slave *slave; 4284 int i; 4285 unsigned long speed = 0; 4286 4287 ecmd->duplex = DUPLEX_UNKNOWN; 4288 ecmd->port = PORT_OTHER; 4289 4290 /* Since SLAVE_IS_OK returns false for all inactive or down slaves, we 4291 * do not need to check mode. Though link speed might not represent 4292 * the true receive or transmit bandwidth (not all modes are symmetric) 4293 * this is an accurate maximum. 4294 */ 4295 read_lock(&bond->lock); 4296 bond_for_each_slave(bond, slave, i) { 4297 if (SLAVE_IS_OK(slave)) { 4298 if (slave->speed != SPEED_UNKNOWN) 4299 speed += slave->speed; 4300 if (ecmd->duplex == DUPLEX_UNKNOWN && 4301 slave->duplex != DUPLEX_UNKNOWN) 4302 ecmd->duplex = slave->duplex; 4303 } 4304 } 4305 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN); 4306 read_unlock(&bond->lock); 4307 return 0; 4308 } 4309 4310 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 4311 struct ethtool_drvinfo *drvinfo) 4312 { 4313 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver)); 4314 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version)); 4315 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d", 4316 BOND_ABI_VERSION); 4317 } 4318 4319 static const struct ethtool_ops bond_ethtool_ops = { 4320 .get_drvinfo = bond_ethtool_get_drvinfo, 4321 .get_settings = bond_ethtool_get_settings, 4322 .get_link = ethtool_op_get_link, 4323 }; 4324 4325 static const struct net_device_ops bond_netdev_ops = { 4326 .ndo_init = bond_init, 4327 .ndo_uninit = bond_uninit, 4328 .ndo_open = bond_open, 4329 .ndo_stop = bond_close, 4330 .ndo_start_xmit = bond_start_xmit, 4331 .ndo_select_queue = bond_select_queue, 4332 .ndo_get_stats64 = bond_get_stats, 4333 .ndo_do_ioctl = bond_do_ioctl, 4334 .ndo_change_rx_flags = bond_change_rx_flags, 4335 .ndo_set_rx_mode = bond_set_multicast_list, 4336 .ndo_change_mtu = bond_change_mtu, 4337 .ndo_set_mac_address = bond_set_mac_address, 4338 .ndo_neigh_setup = bond_neigh_setup, 4339 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 4340 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 4341 #ifdef CONFIG_NET_POLL_CONTROLLER 4342 .ndo_netpoll_setup = bond_netpoll_setup, 4343 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 4344 .ndo_poll_controller = bond_poll_controller, 4345 #endif 4346 .ndo_add_slave = bond_enslave, 4347 .ndo_del_slave = bond_release, 4348 .ndo_fix_features = bond_fix_features, 4349 }; 4350 4351 static const struct device_type bond_type = { 4352 .name = "bond", 4353 }; 4354 4355 static void bond_destructor(struct net_device *bond_dev) 4356 { 4357 struct bonding *bond = netdev_priv(bond_dev); 4358 if (bond->wq) 4359 destroy_workqueue(bond->wq); 4360 free_netdev(bond_dev); 4361 } 4362 4363 static void bond_setup(struct net_device *bond_dev) 4364 { 4365 struct bonding *bond = netdev_priv(bond_dev); 4366 4367 /* initialize rwlocks */ 4368 rwlock_init(&bond->lock); 4369 rwlock_init(&bond->curr_slave_lock); 4370 4371 bond->params = bonding_defaults; 4372 4373 /* Initialize pointers */ 4374 bond->dev = bond_dev; 4375 INIT_LIST_HEAD(&bond->vlan_list); 4376 4377 /* Initialize the device entry points */ 4378 ether_setup(bond_dev); 4379 bond_dev->netdev_ops = &bond_netdev_ops; 4380 bond_dev->ethtool_ops = &bond_ethtool_ops; 4381 bond_set_mode_ops(bond, bond->params.mode); 4382 4383 bond_dev->destructor = bond_destructor; 4384 4385 SET_NETDEV_DEVTYPE(bond_dev, &bond_type); 4386 4387 /* Initialize the device options */ 4388 bond_dev->tx_queue_len = 0; 4389 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST; 4390 bond_dev->priv_flags |= IFF_BONDING; 4391 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 4392 4393 /* At first, we block adding VLANs. That's the only way to 4394 * prevent problems that occur when adding VLANs over an 4395 * empty bond. The block will be removed once non-challenged 4396 * slaves are enslaved. 4397 */ 4398 bond_dev->features |= NETIF_F_VLAN_CHALLENGED; 4399 4400 /* don't acquire bond device's netif_tx_lock when 4401 * transmitting */ 4402 bond_dev->features |= NETIF_F_LLTX; 4403 4404 /* By default, we declare the bond to be fully 4405 * VLAN hardware accelerated capable. Special 4406 * care is taken in the various xmit functions 4407 * when there are slaves that are not hw accel 4408 * capable 4409 */ 4410 4411 bond_dev->hw_features = BOND_VLAN_FEATURES | 4412 NETIF_F_HW_VLAN_CTAG_TX | 4413 NETIF_F_HW_VLAN_CTAG_RX | 4414 NETIF_F_HW_VLAN_CTAG_FILTER; 4415 4416 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM); 4417 bond_dev->features |= bond_dev->hw_features; 4418 } 4419 4420 /* 4421 * Destroy a bonding device. 4422 * Must be under rtnl_lock when this function is called. 4423 */ 4424 static void bond_uninit(struct net_device *bond_dev) 4425 { 4426 struct bonding *bond = netdev_priv(bond_dev); 4427 struct vlan_entry *vlan, *tmp; 4428 4429 bond_netpoll_cleanup(bond_dev); 4430 4431 /* Release the bonded slaves */ 4432 while (bond->first_slave != NULL) 4433 __bond_release_one(bond_dev, bond->first_slave->dev, true); 4434 pr_info("%s: released all slaves\n", bond_dev->name); 4435 4436 list_del(&bond->bond_list); 4437 4438 bond_debug_unregister(bond); 4439 4440 __hw_addr_flush(&bond->mc_list); 4441 4442 list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) { 4443 list_del(&vlan->vlan_list); 4444 kfree(vlan); 4445 } 4446 } 4447 4448 /*------------------------- Module initialization ---------------------------*/ 4449 4450 /* 4451 * Convert string input module parms. Accept either the 4452 * number of the mode or its string name. A bit complicated because 4453 * some mode names are substrings of other names, and calls from sysfs 4454 * may have whitespace in the name (trailing newlines, for example). 4455 */ 4456 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl) 4457 { 4458 int modeint = -1, i, rv; 4459 char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, }; 4460 4461 for (p = (char *)buf; *p; p++) 4462 if (!(isdigit(*p) || isspace(*p))) 4463 break; 4464 4465 if (*p) 4466 rv = sscanf(buf, "%20s", modestr); 4467 else 4468 rv = sscanf(buf, "%d", &modeint); 4469 4470 if (!rv) 4471 return -1; 4472 4473 for (i = 0; tbl[i].modename; i++) { 4474 if (modeint == tbl[i].mode) 4475 return tbl[i].mode; 4476 if (strcmp(modestr, tbl[i].modename) == 0) 4477 return tbl[i].mode; 4478 } 4479 4480 return -1; 4481 } 4482 4483 static int bond_check_params(struct bond_params *params) 4484 { 4485 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i; 4486 4487 /* 4488 * Convert string parameters. 4489 */ 4490 if (mode) { 4491 bond_mode = bond_parse_parm(mode, bond_mode_tbl); 4492 if (bond_mode == -1) { 4493 pr_err("Error: Invalid bonding mode \"%s\"\n", 4494 mode == NULL ? "NULL" : mode); 4495 return -EINVAL; 4496 } 4497 } 4498 4499 if (xmit_hash_policy) { 4500 if ((bond_mode != BOND_MODE_XOR) && 4501 (bond_mode != BOND_MODE_8023AD)) { 4502 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 4503 bond_mode_name(bond_mode)); 4504 } else { 4505 xmit_hashtype = bond_parse_parm(xmit_hash_policy, 4506 xmit_hashtype_tbl); 4507 if (xmit_hashtype == -1) { 4508 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 4509 xmit_hash_policy == NULL ? "NULL" : 4510 xmit_hash_policy); 4511 return -EINVAL; 4512 } 4513 } 4514 } 4515 4516 if (lacp_rate) { 4517 if (bond_mode != BOND_MODE_8023AD) { 4518 pr_info("lacp_rate param is irrelevant in mode %s\n", 4519 bond_mode_name(bond_mode)); 4520 } else { 4521 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl); 4522 if (lacp_fast == -1) { 4523 pr_err("Error: Invalid lacp rate \"%s\"\n", 4524 lacp_rate == NULL ? "NULL" : lacp_rate); 4525 return -EINVAL; 4526 } 4527 } 4528 } 4529 4530 if (ad_select) { 4531 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl); 4532 if (params->ad_select == -1) { 4533 pr_err("Error: Invalid ad_select \"%s\"\n", 4534 ad_select == NULL ? "NULL" : ad_select); 4535 return -EINVAL; 4536 } 4537 4538 if (bond_mode != BOND_MODE_8023AD) { 4539 pr_warning("ad_select param only affects 802.3ad mode\n"); 4540 } 4541 } else { 4542 params->ad_select = BOND_AD_STABLE; 4543 } 4544 4545 if (max_bonds < 0) { 4546 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 4547 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 4548 max_bonds = BOND_DEFAULT_MAX_BONDS; 4549 } 4550 4551 if (miimon < 0) { 4552 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n", 4553 miimon, INT_MAX, BOND_LINK_MON_INTERV); 4554 miimon = BOND_LINK_MON_INTERV; 4555 } 4556 4557 if (updelay < 0) { 4558 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4559 updelay, INT_MAX); 4560 updelay = 0; 4561 } 4562 4563 if (downdelay < 0) { 4564 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 4565 downdelay, INT_MAX); 4566 downdelay = 0; 4567 } 4568 4569 if ((use_carrier != 0) && (use_carrier != 1)) { 4570 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 4571 use_carrier); 4572 use_carrier = 1; 4573 } 4574 4575 if (num_peer_notif < 0 || num_peer_notif > 255) { 4576 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 4577 num_peer_notif); 4578 num_peer_notif = 1; 4579 } 4580 4581 /* reset values for 802.3ad */ 4582 if (bond_mode == BOND_MODE_8023AD) { 4583 if (!miimon) { 4584 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"); 4585 pr_warning("Forcing miimon to 100msec\n"); 4586 miimon = 100; 4587 } 4588 } 4589 4590 if (tx_queues < 1 || tx_queues > 255) { 4591 pr_warning("Warning: tx_queues (%d) should be between " 4592 "1 and 255, resetting to %d\n", 4593 tx_queues, BOND_DEFAULT_TX_QUEUES); 4594 tx_queues = BOND_DEFAULT_TX_QUEUES; 4595 } 4596 4597 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 4598 pr_warning("Warning: all_slaves_active module parameter (%d), " 4599 "not of valid value (0/1), so it was set to " 4600 "0\n", all_slaves_active); 4601 all_slaves_active = 0; 4602 } 4603 4604 if (resend_igmp < 0 || resend_igmp > 255) { 4605 pr_warning("Warning: resend_igmp (%d) should be between " 4606 "0 and 255, resetting to %d\n", 4607 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 4608 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 4609 } 4610 4611 /* reset values for TLB/ALB */ 4612 if ((bond_mode == BOND_MODE_TLB) || 4613 (bond_mode == BOND_MODE_ALB)) { 4614 if (!miimon) { 4615 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"); 4616 pr_warning("Forcing miimon to 100msec\n"); 4617 miimon = 100; 4618 } 4619 } 4620 4621 if (bond_mode == BOND_MODE_ALB) { 4622 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", 4623 updelay); 4624 } 4625 4626 if (!miimon) { 4627 if (updelay || downdelay) { 4628 /* just warn the user the up/down delay will have 4629 * no effect since miimon is zero... 4630 */ 4631 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", 4632 updelay, downdelay); 4633 } 4634 } else { 4635 /* don't allow arp monitoring */ 4636 if (arp_interval) { 4637 pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 4638 miimon, arp_interval); 4639 arp_interval = 0; 4640 } 4641 4642 if ((updelay % miimon) != 0) { 4643 pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 4644 updelay, miimon, 4645 (updelay / miimon) * miimon); 4646 } 4647 4648 updelay /= miimon; 4649 4650 if ((downdelay % miimon) != 0) { 4651 pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 4652 downdelay, miimon, 4653 (downdelay / miimon) * miimon); 4654 } 4655 4656 downdelay /= miimon; 4657 } 4658 4659 if (arp_interval < 0) { 4660 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n", 4661 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV); 4662 arp_interval = BOND_LINK_ARP_INTERV; 4663 } 4664 4665 for (arp_ip_count = 0, i = 0; 4666 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) { 4667 /* not complete check, but should be good enough to 4668 catch mistakes */ 4669 __be32 ip = in_aton(arp_ip_target[i]); 4670 if (!isdigit(arp_ip_target[i][0]) || ip == 0 || 4671 ip == htonl(INADDR_BROADCAST)) { 4672 pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 4673 arp_ip_target[i]); 4674 arp_interval = 0; 4675 } else { 4676 arp_target[arp_ip_count++] = ip; 4677 } 4678 } 4679 4680 if (arp_interval && !arp_ip_count) { 4681 /* don't allow arping if no arp_ip_target given... */ 4682 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 4683 arp_interval); 4684 arp_interval = 0; 4685 } 4686 4687 if (arp_validate) { 4688 if (bond_mode != BOND_MODE_ACTIVEBACKUP) { 4689 pr_err("arp_validate only supported in active-backup mode\n"); 4690 return -EINVAL; 4691 } 4692 if (!arp_interval) { 4693 pr_err("arp_validate requires arp_interval\n"); 4694 return -EINVAL; 4695 } 4696 4697 arp_validate_value = bond_parse_parm(arp_validate, 4698 arp_validate_tbl); 4699 if (arp_validate_value == -1) { 4700 pr_err("Error: invalid arp_validate \"%s\"\n", 4701 arp_validate == NULL ? "NULL" : arp_validate); 4702 return -EINVAL; 4703 } 4704 } else 4705 arp_validate_value = 0; 4706 4707 if (miimon) { 4708 pr_info("MII link monitoring set to %d ms\n", miimon); 4709 } else if (arp_interval) { 4710 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 4711 arp_interval, 4712 arp_validate_tbl[arp_validate_value].modename, 4713 arp_ip_count); 4714 4715 for (i = 0; i < arp_ip_count; i++) 4716 pr_info(" %s", arp_ip_target[i]); 4717 4718 pr_info("\n"); 4719 4720 } else if (max_bonds) { 4721 /* miimon and arp_interval not set, we need one so things 4722 * work as expected, see bonding.txt for details 4723 */ 4724 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"); 4725 } 4726 4727 if (primary && !USES_PRIMARY(bond_mode)) { 4728 /* currently, using a primary only makes sense 4729 * in active backup, TLB or ALB modes 4730 */ 4731 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n", 4732 primary, bond_mode_name(bond_mode)); 4733 primary = NULL; 4734 } 4735 4736 if (primary && primary_reselect) { 4737 primary_reselect_value = bond_parse_parm(primary_reselect, 4738 pri_reselect_tbl); 4739 if (primary_reselect_value == -1) { 4740 pr_err("Error: Invalid primary_reselect \"%s\"\n", 4741 primary_reselect == 4742 NULL ? "NULL" : primary_reselect); 4743 return -EINVAL; 4744 } 4745 } else { 4746 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 4747 } 4748 4749 if (fail_over_mac) { 4750 fail_over_mac_value = bond_parse_parm(fail_over_mac, 4751 fail_over_mac_tbl); 4752 if (fail_over_mac_value == -1) { 4753 pr_err("Error: invalid fail_over_mac \"%s\"\n", 4754 arp_validate == NULL ? "NULL" : arp_validate); 4755 return -EINVAL; 4756 } 4757 4758 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 4759 pr_warning("Warning: fail_over_mac only affects active-backup mode.\n"); 4760 } else { 4761 fail_over_mac_value = BOND_FOM_NONE; 4762 } 4763 4764 /* fill params struct with the proper values */ 4765 params->mode = bond_mode; 4766 params->xmit_policy = xmit_hashtype; 4767 params->miimon = miimon; 4768 params->num_peer_notif = num_peer_notif; 4769 params->arp_interval = arp_interval; 4770 params->arp_validate = arp_validate_value; 4771 params->updelay = updelay; 4772 params->downdelay = downdelay; 4773 params->use_carrier = use_carrier; 4774 params->lacp_fast = lacp_fast; 4775 params->primary[0] = 0; 4776 params->primary_reselect = primary_reselect_value; 4777 params->fail_over_mac = fail_over_mac_value; 4778 params->tx_queues = tx_queues; 4779 params->all_slaves_active = all_slaves_active; 4780 params->resend_igmp = resend_igmp; 4781 params->min_links = min_links; 4782 4783 if (primary) { 4784 strncpy(params->primary, primary, IFNAMSIZ); 4785 params->primary[IFNAMSIZ - 1] = 0; 4786 } 4787 4788 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 4789 4790 return 0; 4791 } 4792 4793 static struct lock_class_key bonding_netdev_xmit_lock_key; 4794 static struct lock_class_key bonding_netdev_addr_lock_key; 4795 static struct lock_class_key bonding_tx_busylock_key; 4796 4797 static void bond_set_lockdep_class_one(struct net_device *dev, 4798 struct netdev_queue *txq, 4799 void *_unused) 4800 { 4801 lockdep_set_class(&txq->_xmit_lock, 4802 &bonding_netdev_xmit_lock_key); 4803 } 4804 4805 static void bond_set_lockdep_class(struct net_device *dev) 4806 { 4807 lockdep_set_class(&dev->addr_list_lock, 4808 &bonding_netdev_addr_lock_key); 4809 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL); 4810 dev->qdisc_tx_busylock = &bonding_tx_busylock_key; 4811 } 4812 4813 /* 4814 * Called from registration process 4815 */ 4816 static int bond_init(struct net_device *bond_dev) 4817 { 4818 struct bonding *bond = netdev_priv(bond_dev); 4819 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 4820 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond)); 4821 4822 pr_debug("Begin bond_init for %s\n", bond_dev->name); 4823 4824 /* 4825 * Initialize locks that may be required during 4826 * en/deslave operations. All of the bond_open work 4827 * (of which this is part) should really be moved to 4828 * a phase prior to dev_open 4829 */ 4830 spin_lock_init(&(bond_info->tx_hashtbl_lock)); 4831 spin_lock_init(&(bond_info->rx_hashtbl_lock)); 4832 4833 bond->wq = create_singlethread_workqueue(bond_dev->name); 4834 if (!bond->wq) 4835 return -ENOMEM; 4836 4837 bond_set_lockdep_class(bond_dev); 4838 4839 list_add_tail(&bond->bond_list, &bn->dev_list); 4840 4841 bond_prepare_sysfs_group(bond); 4842 4843 bond_debug_register(bond); 4844 4845 /* Ensure valid dev_addr */ 4846 if (is_zero_ether_addr(bond_dev->dev_addr) && 4847 bond_dev->addr_assign_type == NET_ADDR_PERM) { 4848 eth_hw_addr_random(bond_dev); 4849 bond->dev_addr_from_first = true; 4850 } 4851 4852 __hw_addr_init(&bond->mc_list); 4853 return 0; 4854 } 4855 4856 static int bond_validate(struct nlattr *tb[], struct nlattr *data[]) 4857 { 4858 if (tb[IFLA_ADDRESS]) { 4859 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 4860 return -EINVAL; 4861 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 4862 return -EADDRNOTAVAIL; 4863 } 4864 return 0; 4865 } 4866 4867 static unsigned int bond_get_num_tx_queues(void) 4868 { 4869 return tx_queues; 4870 } 4871 4872 static struct rtnl_link_ops bond_link_ops __read_mostly = { 4873 .kind = "bond", 4874 .priv_size = sizeof(struct bonding), 4875 .setup = bond_setup, 4876 .validate = bond_validate, 4877 .get_num_tx_queues = bond_get_num_tx_queues, 4878 .get_num_rx_queues = bond_get_num_tx_queues, /* Use the same number 4879 as for TX queues */ 4880 }; 4881 4882 /* Create a new bond based on the specified name and bonding parameters. 4883 * If name is NULL, obtain a suitable "bond%d" name for us. 4884 * Caller must NOT hold rtnl_lock; we need to release it here before we 4885 * set up our sysfs entries. 4886 */ 4887 int bond_create(struct net *net, const char *name) 4888 { 4889 struct net_device *bond_dev; 4890 int res; 4891 4892 rtnl_lock(); 4893 4894 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 4895 name ? name : "bond%d", 4896 bond_setup, tx_queues); 4897 if (!bond_dev) { 4898 pr_err("%s: eek! can't alloc netdev!\n", name); 4899 rtnl_unlock(); 4900 return -ENOMEM; 4901 } 4902 4903 dev_net_set(bond_dev, net); 4904 bond_dev->rtnl_link_ops = &bond_link_ops; 4905 4906 res = register_netdevice(bond_dev); 4907 4908 netif_carrier_off(bond_dev); 4909 4910 rtnl_unlock(); 4911 if (res < 0) 4912 bond_destructor(bond_dev); 4913 return res; 4914 } 4915 4916 static int __net_init bond_net_init(struct net *net) 4917 { 4918 struct bond_net *bn = net_generic(net, bond_net_id); 4919 4920 bn->net = net; 4921 INIT_LIST_HEAD(&bn->dev_list); 4922 4923 bond_create_proc_dir(bn); 4924 bond_create_sysfs(bn); 4925 4926 return 0; 4927 } 4928 4929 static void __net_exit bond_net_exit(struct net *net) 4930 { 4931 struct bond_net *bn = net_generic(net, bond_net_id); 4932 struct bonding *bond, *tmp_bond; 4933 LIST_HEAD(list); 4934 4935 bond_destroy_sysfs(bn); 4936 bond_destroy_proc_dir(bn); 4937 4938 /* Kill off any bonds created after unregistering bond rtnl ops */ 4939 rtnl_lock(); 4940 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list) 4941 unregister_netdevice_queue(bond->dev, &list); 4942 unregister_netdevice_many(&list); 4943 rtnl_unlock(); 4944 } 4945 4946 static struct pernet_operations bond_net_ops = { 4947 .init = bond_net_init, 4948 .exit = bond_net_exit, 4949 .id = &bond_net_id, 4950 .size = sizeof(struct bond_net), 4951 }; 4952 4953 static int __init bonding_init(void) 4954 { 4955 int i; 4956 int res; 4957 4958 pr_info("%s", bond_version); 4959 4960 res = bond_check_params(&bonding_defaults); 4961 if (res) 4962 goto out; 4963 4964 res = register_pernet_subsys(&bond_net_ops); 4965 if (res) 4966 goto out; 4967 4968 res = rtnl_link_register(&bond_link_ops); 4969 if (res) 4970 goto err_link; 4971 4972 bond_create_debugfs(); 4973 4974 for (i = 0; i < max_bonds; i++) { 4975 res = bond_create(&init_net, NULL); 4976 if (res) 4977 goto err; 4978 } 4979 4980 register_netdevice_notifier(&bond_netdev_notifier); 4981 out: 4982 return res; 4983 err: 4984 rtnl_link_unregister(&bond_link_ops); 4985 err_link: 4986 unregister_pernet_subsys(&bond_net_ops); 4987 goto out; 4988 4989 } 4990 4991 static void __exit bonding_exit(void) 4992 { 4993 unregister_netdevice_notifier(&bond_netdev_notifier); 4994 4995 bond_destroy_debugfs(); 4996 4997 rtnl_link_unregister(&bond_link_ops); 4998 unregister_pernet_subsys(&bond_net_ops); 4999 5000 #ifdef CONFIG_NET_POLL_CONTROLLER 5001 /* 5002 * Make sure we don't have an imbalance on our netpoll blocking 5003 */ 5004 WARN_ON(atomic_read(&netpoll_block_tx)); 5005 #endif 5006 } 5007 5008 module_init(bonding_init); 5009 module_exit(bonding_exit); 5010 MODULE_LICENSE("GPL"); 5011 MODULE_VERSION(DRV_VERSION); 5012 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION); 5013 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 5014 MODULE_ALIAS_RTNL_LINK("bond"); 5015