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 #include <linux/kernel.h> 35 #include <linux/module.h> 36 #include <linux/types.h> 37 #include <linux/fcntl.h> 38 #include <linux/filter.h> 39 #include <linux/interrupt.h> 40 #include <linux/ptrace.h> 41 #include <linux/ioport.h> 42 #include <linux/in.h> 43 #include <net/ip.h> 44 #include <linux/ip.h> 45 #include <linux/icmp.h> 46 #include <linux/icmpv6.h> 47 #include <linux/tcp.h> 48 #include <linux/udp.h> 49 #include <linux/slab.h> 50 #include <linux/string.h> 51 #include <linux/init.h> 52 #include <linux/timer.h> 53 #include <linux/socket.h> 54 #include <linux/ctype.h> 55 #include <linux/inet.h> 56 #include <linux/bitops.h> 57 #include <linux/io.h> 58 #include <asm/dma.h> 59 #include <linux/uaccess.h> 60 #include <linux/errno.h> 61 #include <linux/netdevice.h> 62 #include <linux/inetdevice.h> 63 #include <linux/igmp.h> 64 #include <linux/etherdevice.h> 65 #include <linux/skbuff.h> 66 #include <net/sock.h> 67 #include <linux/rtnetlink.h> 68 #include <linux/smp.h> 69 #include <linux/if_ether.h> 70 #include <net/arp.h> 71 #include <linux/mii.h> 72 #include <linux/ethtool.h> 73 #include <linux/if_vlan.h> 74 #include <linux/if_bonding.h> 75 #include <linux/phy.h> 76 #include <linux/jiffies.h> 77 #include <linux/preempt.h> 78 #include <net/route.h> 79 #include <net/net_namespace.h> 80 #include <net/netns/generic.h> 81 #include <net/pkt_sched.h> 82 #include <linux/rculist.h> 83 #include <net/flow_dissector.h> 84 #include <net/xfrm.h> 85 #include <net/bonding.h> 86 #include <net/bond_3ad.h> 87 #include <net/bond_alb.h> 88 #if IS_ENABLED(CONFIG_TLS_DEVICE) 89 #include <net/tls.h> 90 #endif 91 #include <net/ip6_route.h> 92 93 #include "bonding_priv.h" 94 95 /*---------------------------- Module parameters ----------------------------*/ 96 97 /* monitor all links that often (in milliseconds). <=0 disables monitoring */ 98 99 static int max_bonds = BOND_DEFAULT_MAX_BONDS; 100 static int tx_queues = BOND_DEFAULT_TX_QUEUES; 101 static int num_peer_notif = 1; 102 static int miimon; 103 static int updelay; 104 static int downdelay; 105 static int use_carrier = 1; 106 static char *mode; 107 static char *primary; 108 static char *primary_reselect; 109 static char *lacp_rate; 110 static int min_links; 111 static char *ad_select; 112 static char *xmit_hash_policy; 113 static int arp_interval; 114 static char *arp_ip_target[BOND_MAX_ARP_TARGETS]; 115 static char *arp_validate; 116 static char *arp_all_targets; 117 static char *fail_over_mac; 118 static int all_slaves_active; 119 static struct bond_params bonding_defaults; 120 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP; 121 static int packets_per_slave = 1; 122 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 123 124 module_param(max_bonds, int, 0); 125 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices"); 126 module_param(tx_queues, int, 0); 127 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)"); 128 module_param_named(num_grat_arp, num_peer_notif, int, 0644); 129 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on " 130 "failover event (alias of num_unsol_na)"); 131 module_param_named(num_unsol_na, num_peer_notif, int, 0644); 132 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on " 133 "failover event (alias of num_grat_arp)"); 134 module_param(miimon, int, 0); 135 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds"); 136 module_param(updelay, int, 0); 137 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds"); 138 module_param(downdelay, int, 0); 139 MODULE_PARM_DESC(downdelay, "Delay before considering link down, " 140 "in milliseconds"); 141 module_param(use_carrier, int, 0); 142 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; " 143 "0 for off, 1 for on (default)"); 144 module_param(mode, charp, 0); 145 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, " 146 "1 for active-backup, 2 for balance-xor, " 147 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, " 148 "6 for balance-alb"); 149 module_param(primary, charp, 0); 150 MODULE_PARM_DESC(primary, "Primary network device to use"); 151 module_param(primary_reselect, charp, 0); 152 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave " 153 "once it comes up; " 154 "0 for always (default), " 155 "1 for only if speed of primary is " 156 "better, " 157 "2 for only on active slave " 158 "failure"); 159 module_param(lacp_rate, charp, 0); 160 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; " 161 "0 for slow, 1 for fast"); 162 module_param(ad_select, charp, 0); 163 MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; " 164 "0 for stable (default), 1 for bandwidth, " 165 "2 for count"); 166 module_param(min_links, int, 0); 167 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier"); 168 169 module_param(xmit_hash_policy, charp, 0); 170 MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; " 171 "0 for layer 2 (default), 1 for layer 3+4, " 172 "2 for layer 2+3, 3 for encap layer 2+3, " 173 "4 for encap layer 3+4, 5 for vlan+srcmac"); 174 module_param(arp_interval, int, 0); 175 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds"); 176 module_param_array(arp_ip_target, charp, NULL, 0); 177 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form"); 178 module_param(arp_validate, charp, 0); 179 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; " 180 "0 for none (default), 1 for active, " 181 "2 for backup, 3 for all"); 182 module_param(arp_all_targets, charp, 0); 183 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all"); 184 module_param(fail_over_mac, charp, 0); 185 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to " 186 "the same MAC; 0 for none (default), " 187 "1 for active, 2 for follow"); 188 module_param(all_slaves_active, int, 0); 189 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface " 190 "by setting active flag for all slaves; " 191 "0 for never (default), 1 for always."); 192 module_param(resend_igmp, int, 0); 193 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on " 194 "link failure"); 195 module_param(packets_per_slave, int, 0); 196 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr " 197 "mode; 0 for a random slave, 1 packet per " 198 "slave (default), >1 packets per slave."); 199 module_param(lp_interval, uint, 0); 200 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where " 201 "the bonding driver sends learning packets to " 202 "each slaves peer switch. The default is 1."); 203 204 /*----------------------------- Global variables ----------------------------*/ 205 206 #ifdef CONFIG_NET_POLL_CONTROLLER 207 atomic_t netpoll_block_tx = ATOMIC_INIT(0); 208 #endif 209 210 unsigned int bond_net_id __read_mostly; 211 212 static const struct flow_dissector_key flow_keys_bonding_keys[] = { 213 { 214 .key_id = FLOW_DISSECTOR_KEY_CONTROL, 215 .offset = offsetof(struct flow_keys, control), 216 }, 217 { 218 .key_id = FLOW_DISSECTOR_KEY_BASIC, 219 .offset = offsetof(struct flow_keys, basic), 220 }, 221 { 222 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS, 223 .offset = offsetof(struct flow_keys, addrs.v4addrs), 224 }, 225 { 226 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS, 227 .offset = offsetof(struct flow_keys, addrs.v6addrs), 228 }, 229 { 230 .key_id = FLOW_DISSECTOR_KEY_TIPC, 231 .offset = offsetof(struct flow_keys, addrs.tipckey), 232 }, 233 { 234 .key_id = FLOW_DISSECTOR_KEY_PORTS, 235 .offset = offsetof(struct flow_keys, ports), 236 }, 237 { 238 .key_id = FLOW_DISSECTOR_KEY_ICMP, 239 .offset = offsetof(struct flow_keys, icmp), 240 }, 241 { 242 .key_id = FLOW_DISSECTOR_KEY_VLAN, 243 .offset = offsetof(struct flow_keys, vlan), 244 }, 245 { 246 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL, 247 .offset = offsetof(struct flow_keys, tags), 248 }, 249 { 250 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID, 251 .offset = offsetof(struct flow_keys, keyid), 252 }, 253 }; 254 255 static struct flow_dissector flow_keys_bonding __read_mostly; 256 257 /*-------------------------- Forward declarations ---------------------------*/ 258 259 static int bond_init(struct net_device *bond_dev); 260 static void bond_uninit(struct net_device *bond_dev); 261 static void bond_get_stats(struct net_device *bond_dev, 262 struct rtnl_link_stats64 *stats); 263 static void bond_slave_arr_handler(struct work_struct *work); 264 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 265 int mod); 266 static void bond_netdev_notify_work(struct work_struct *work); 267 268 /*---------------------------- General routines -----------------------------*/ 269 270 const char *bond_mode_name(int mode) 271 { 272 static const char *names[] = { 273 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)", 274 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)", 275 [BOND_MODE_XOR] = "load balancing (xor)", 276 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)", 277 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation", 278 [BOND_MODE_TLB] = "transmit load balancing", 279 [BOND_MODE_ALB] = "adaptive load balancing", 280 }; 281 282 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB) 283 return "unknown"; 284 285 return names[mode]; 286 } 287 288 /** 289 * bond_dev_queue_xmit - Prepare skb for xmit. 290 * 291 * @bond: bond device that got this skb for tx. 292 * @skb: hw accel VLAN tagged skb to transmit 293 * @slave_dev: slave that is supposed to xmit this skbuff 294 */ 295 netdev_tx_t bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, 296 struct net_device *slave_dev) 297 { 298 skb->dev = slave_dev; 299 300 BUILD_BUG_ON(sizeof(skb->queue_mapping) != 301 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping)); 302 skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping); 303 304 if (unlikely(netpoll_tx_running(bond->dev))) 305 return bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb); 306 307 return dev_queue_xmit(skb); 308 } 309 310 bool bond_sk_check(struct bonding *bond) 311 { 312 switch (BOND_MODE(bond)) { 313 case BOND_MODE_8023AD: 314 case BOND_MODE_XOR: 315 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34) 316 return true; 317 fallthrough; 318 default: 319 return false; 320 } 321 } 322 323 static bool bond_xdp_check(struct bonding *bond) 324 { 325 switch (BOND_MODE(bond)) { 326 case BOND_MODE_ROUNDROBIN: 327 case BOND_MODE_ACTIVEBACKUP: 328 return true; 329 case BOND_MODE_8023AD: 330 case BOND_MODE_XOR: 331 /* vlan+srcmac is not supported with XDP as in most cases the 802.1q 332 * payload is not in the packet due to hardware offload. 333 */ 334 if (bond->params.xmit_policy != BOND_XMIT_POLICY_VLAN_SRCMAC) 335 return true; 336 fallthrough; 337 default: 338 return false; 339 } 340 } 341 342 /*---------------------------------- VLAN -----------------------------------*/ 343 344 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid, 345 * We don't protect the slave list iteration with a lock because: 346 * a. This operation is performed in IOCTL context, 347 * b. The operation is protected by the RTNL semaphore in the 8021q code, 348 * c. Holding a lock with BH disabled while directly calling a base driver 349 * entry point is generally a BAD idea. 350 * 351 * The design of synchronization/protection for this operation in the 8021q 352 * module is good for one or more VLAN devices over a single physical device 353 * and cannot be extended for a teaming solution like bonding, so there is a 354 * potential race condition here where a net device from the vlan group might 355 * be referenced (either by a base driver or the 8021q code) while it is being 356 * removed from the system. However, it turns out we're not making matters 357 * worse, and if it works for regular VLAN usage it will work here too. 358 */ 359 360 /** 361 * bond_vlan_rx_add_vid - Propagates adding an id to slaves 362 * @bond_dev: bonding net device that got called 363 * @proto: network protocol ID 364 * @vid: vlan id being added 365 */ 366 static int bond_vlan_rx_add_vid(struct net_device *bond_dev, 367 __be16 proto, u16 vid) 368 { 369 struct bonding *bond = netdev_priv(bond_dev); 370 struct slave *slave, *rollback_slave; 371 struct list_head *iter; 372 int res; 373 374 bond_for_each_slave(bond, slave, iter) { 375 res = vlan_vid_add(slave->dev, proto, vid); 376 if (res) 377 goto unwind; 378 } 379 380 return 0; 381 382 unwind: 383 /* unwind to the slave that failed */ 384 bond_for_each_slave(bond, rollback_slave, iter) { 385 if (rollback_slave == slave) 386 break; 387 388 vlan_vid_del(rollback_slave->dev, proto, vid); 389 } 390 391 return res; 392 } 393 394 /** 395 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves 396 * @bond_dev: bonding net device that got called 397 * @proto: network protocol ID 398 * @vid: vlan id being removed 399 */ 400 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, 401 __be16 proto, u16 vid) 402 { 403 struct bonding *bond = netdev_priv(bond_dev); 404 struct list_head *iter; 405 struct slave *slave; 406 407 bond_for_each_slave(bond, slave, iter) 408 vlan_vid_del(slave->dev, proto, vid); 409 410 if (bond_is_lb(bond)) 411 bond_alb_clear_vlan(bond, vid); 412 413 return 0; 414 } 415 416 /*---------------------------------- XFRM -----------------------------------*/ 417 418 #ifdef CONFIG_XFRM_OFFLOAD 419 /** 420 * bond_ipsec_add_sa - program device with a security association 421 * @xs: pointer to transformer state struct 422 **/ 423 static int bond_ipsec_add_sa(struct xfrm_state *xs) 424 { 425 struct net_device *bond_dev = xs->xso.dev; 426 struct bond_ipsec *ipsec; 427 struct bonding *bond; 428 struct slave *slave; 429 int err; 430 431 if (!bond_dev) 432 return -EINVAL; 433 434 rcu_read_lock(); 435 bond = netdev_priv(bond_dev); 436 slave = rcu_dereference(bond->curr_active_slave); 437 if (!slave) { 438 rcu_read_unlock(); 439 return -ENODEV; 440 } 441 442 if (!slave->dev->xfrmdev_ops || 443 !slave->dev->xfrmdev_ops->xdo_dev_state_add || 444 netif_is_bond_master(slave->dev)) { 445 slave_warn(bond_dev, slave->dev, "Slave does not support ipsec offload\n"); 446 rcu_read_unlock(); 447 return -EINVAL; 448 } 449 450 ipsec = kmalloc(sizeof(*ipsec), GFP_ATOMIC); 451 if (!ipsec) { 452 rcu_read_unlock(); 453 return -ENOMEM; 454 } 455 xs->xso.real_dev = slave->dev; 456 457 err = slave->dev->xfrmdev_ops->xdo_dev_state_add(xs); 458 if (!err) { 459 ipsec->xs = xs; 460 INIT_LIST_HEAD(&ipsec->list); 461 spin_lock_bh(&bond->ipsec_lock); 462 list_add(&ipsec->list, &bond->ipsec_list); 463 spin_unlock_bh(&bond->ipsec_lock); 464 } else { 465 kfree(ipsec); 466 } 467 rcu_read_unlock(); 468 return err; 469 } 470 471 static void bond_ipsec_add_sa_all(struct bonding *bond) 472 { 473 struct net_device *bond_dev = bond->dev; 474 struct bond_ipsec *ipsec; 475 struct slave *slave; 476 477 rcu_read_lock(); 478 slave = rcu_dereference(bond->curr_active_slave); 479 if (!slave) 480 goto out; 481 482 if (!slave->dev->xfrmdev_ops || 483 !slave->dev->xfrmdev_ops->xdo_dev_state_add || 484 netif_is_bond_master(slave->dev)) { 485 spin_lock_bh(&bond->ipsec_lock); 486 if (!list_empty(&bond->ipsec_list)) 487 slave_warn(bond_dev, slave->dev, 488 "%s: no slave xdo_dev_state_add\n", 489 __func__); 490 spin_unlock_bh(&bond->ipsec_lock); 491 goto out; 492 } 493 494 spin_lock_bh(&bond->ipsec_lock); 495 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 496 ipsec->xs->xso.real_dev = slave->dev; 497 if (slave->dev->xfrmdev_ops->xdo_dev_state_add(ipsec->xs)) { 498 slave_warn(bond_dev, slave->dev, "%s: failed to add SA\n", __func__); 499 ipsec->xs->xso.real_dev = NULL; 500 } 501 } 502 spin_unlock_bh(&bond->ipsec_lock); 503 out: 504 rcu_read_unlock(); 505 } 506 507 /** 508 * bond_ipsec_del_sa - clear out this specific SA 509 * @xs: pointer to transformer state struct 510 **/ 511 static void bond_ipsec_del_sa(struct xfrm_state *xs) 512 { 513 struct net_device *bond_dev = xs->xso.dev; 514 struct bond_ipsec *ipsec; 515 struct bonding *bond; 516 struct slave *slave; 517 518 if (!bond_dev) 519 return; 520 521 rcu_read_lock(); 522 bond = netdev_priv(bond_dev); 523 slave = rcu_dereference(bond->curr_active_slave); 524 525 if (!slave) 526 goto out; 527 528 if (!xs->xso.real_dev) 529 goto out; 530 531 WARN_ON(xs->xso.real_dev != slave->dev); 532 533 if (!slave->dev->xfrmdev_ops || 534 !slave->dev->xfrmdev_ops->xdo_dev_state_delete || 535 netif_is_bond_master(slave->dev)) { 536 slave_warn(bond_dev, slave->dev, "%s: no slave xdo_dev_state_delete\n", __func__); 537 goto out; 538 } 539 540 slave->dev->xfrmdev_ops->xdo_dev_state_delete(xs); 541 out: 542 spin_lock_bh(&bond->ipsec_lock); 543 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 544 if (ipsec->xs == xs) { 545 list_del(&ipsec->list); 546 kfree(ipsec); 547 break; 548 } 549 } 550 spin_unlock_bh(&bond->ipsec_lock); 551 rcu_read_unlock(); 552 } 553 554 static void bond_ipsec_del_sa_all(struct bonding *bond) 555 { 556 struct net_device *bond_dev = bond->dev; 557 struct bond_ipsec *ipsec; 558 struct slave *slave; 559 560 rcu_read_lock(); 561 slave = rcu_dereference(bond->curr_active_slave); 562 if (!slave) { 563 rcu_read_unlock(); 564 return; 565 } 566 567 spin_lock_bh(&bond->ipsec_lock); 568 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 569 if (!ipsec->xs->xso.real_dev) 570 continue; 571 572 if (!slave->dev->xfrmdev_ops || 573 !slave->dev->xfrmdev_ops->xdo_dev_state_delete || 574 netif_is_bond_master(slave->dev)) { 575 slave_warn(bond_dev, slave->dev, 576 "%s: no slave xdo_dev_state_delete\n", 577 __func__); 578 } else { 579 slave->dev->xfrmdev_ops->xdo_dev_state_delete(ipsec->xs); 580 } 581 ipsec->xs->xso.real_dev = NULL; 582 } 583 spin_unlock_bh(&bond->ipsec_lock); 584 rcu_read_unlock(); 585 } 586 587 /** 588 * bond_ipsec_offload_ok - can this packet use the xfrm hw offload 589 * @skb: current data packet 590 * @xs: pointer to transformer state struct 591 **/ 592 static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs) 593 { 594 struct net_device *bond_dev = xs->xso.dev; 595 struct net_device *real_dev; 596 struct slave *curr_active; 597 struct bonding *bond; 598 int err; 599 600 bond = netdev_priv(bond_dev); 601 rcu_read_lock(); 602 curr_active = rcu_dereference(bond->curr_active_slave); 603 real_dev = curr_active->dev; 604 605 if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 606 err = false; 607 goto out; 608 } 609 610 if (!xs->xso.real_dev) { 611 err = false; 612 goto out; 613 } 614 615 if (!real_dev->xfrmdev_ops || 616 !real_dev->xfrmdev_ops->xdo_dev_offload_ok || 617 netif_is_bond_master(real_dev)) { 618 err = false; 619 goto out; 620 } 621 622 err = real_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs); 623 out: 624 rcu_read_unlock(); 625 return err; 626 } 627 628 static const struct xfrmdev_ops bond_xfrmdev_ops = { 629 .xdo_dev_state_add = bond_ipsec_add_sa, 630 .xdo_dev_state_delete = bond_ipsec_del_sa, 631 .xdo_dev_offload_ok = bond_ipsec_offload_ok, 632 }; 633 #endif /* CONFIG_XFRM_OFFLOAD */ 634 635 /*------------------------------- Link status -------------------------------*/ 636 637 /* Set the carrier state for the master according to the state of its 638 * slaves. If any slaves are up, the master is up. In 802.3ad mode, 639 * do special 802.3ad magic. 640 * 641 * Returns zero if carrier state does not change, nonzero if it does. 642 */ 643 int bond_set_carrier(struct bonding *bond) 644 { 645 struct list_head *iter; 646 struct slave *slave; 647 648 if (!bond_has_slaves(bond)) 649 goto down; 650 651 if (BOND_MODE(bond) == BOND_MODE_8023AD) 652 return bond_3ad_set_carrier(bond); 653 654 bond_for_each_slave(bond, slave, iter) { 655 if (slave->link == BOND_LINK_UP) { 656 if (!netif_carrier_ok(bond->dev)) { 657 netif_carrier_on(bond->dev); 658 return 1; 659 } 660 return 0; 661 } 662 } 663 664 down: 665 if (netif_carrier_ok(bond->dev)) { 666 netif_carrier_off(bond->dev); 667 return 1; 668 } 669 return 0; 670 } 671 672 /* Get link speed and duplex from the slave's base driver 673 * using ethtool. If for some reason the call fails or the 674 * values are invalid, set speed and duplex to -1, 675 * and return. Return 1 if speed or duplex settings are 676 * UNKNOWN; 0 otherwise. 677 */ 678 static int bond_update_speed_duplex(struct slave *slave) 679 { 680 struct net_device *slave_dev = slave->dev; 681 struct ethtool_link_ksettings ecmd; 682 int res; 683 684 slave->speed = SPEED_UNKNOWN; 685 slave->duplex = DUPLEX_UNKNOWN; 686 687 res = __ethtool_get_link_ksettings(slave_dev, &ecmd); 688 if (res < 0) 689 return 1; 690 if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1)) 691 return 1; 692 switch (ecmd.base.duplex) { 693 case DUPLEX_FULL: 694 case DUPLEX_HALF: 695 break; 696 default: 697 return 1; 698 } 699 700 slave->speed = ecmd.base.speed; 701 slave->duplex = ecmd.base.duplex; 702 703 return 0; 704 } 705 706 const char *bond_slave_link_status(s8 link) 707 { 708 switch (link) { 709 case BOND_LINK_UP: 710 return "up"; 711 case BOND_LINK_FAIL: 712 return "going down"; 713 case BOND_LINK_DOWN: 714 return "down"; 715 case BOND_LINK_BACK: 716 return "going back"; 717 default: 718 return "unknown"; 719 } 720 } 721 722 /* if <dev> supports MII link status reporting, check its link status. 723 * 724 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), 725 * depending upon the setting of the use_carrier parameter. 726 * 727 * Return either BMSR_LSTATUS, meaning that the link is up (or we 728 * can't tell and just pretend it is), or 0, meaning that the link is 729 * down. 730 * 731 * If reporting is non-zero, instead of faking link up, return -1 if 732 * both ETHTOOL and MII ioctls fail (meaning the device does not 733 * support them). If use_carrier is set, return whatever it says. 734 * It'd be nice if there was a good way to tell if a driver supports 735 * netif_carrier, but there really isn't. 736 */ 737 static int bond_check_dev_link(struct bonding *bond, 738 struct net_device *slave_dev, int reporting) 739 { 740 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 741 int (*ioctl)(struct net_device *, struct ifreq *, int); 742 struct ifreq ifr; 743 struct mii_ioctl_data *mii; 744 745 if (!reporting && !netif_running(slave_dev)) 746 return 0; 747 748 if (bond->params.use_carrier) 749 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; 750 751 /* Try to get link status using Ethtool first. */ 752 if (slave_dev->ethtool_ops->get_link) 753 return slave_dev->ethtool_ops->get_link(slave_dev) ? 754 BMSR_LSTATUS : 0; 755 756 /* Ethtool can't be used, fallback to MII ioctls. */ 757 ioctl = slave_ops->ndo_eth_ioctl; 758 if (ioctl) { 759 /* TODO: set pointer to correct ioctl on a per team member 760 * bases to make this more efficient. that is, once 761 * we determine the correct ioctl, we will always 762 * call it and not the others for that team 763 * member. 764 */ 765 766 /* We cannot assume that SIOCGMIIPHY will also read a 767 * register; not all network drivers (e.g., e100) 768 * support that. 769 */ 770 771 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ 772 strscpy_pad(ifr.ifr_name, slave_dev->name, IFNAMSIZ); 773 mii = if_mii(&ifr); 774 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) { 775 mii->reg_num = MII_BMSR; 776 if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0) 777 return mii->val_out & BMSR_LSTATUS; 778 } 779 } 780 781 /* If reporting, report that either there's no ndo_eth_ioctl, 782 * or both SIOCGMIIREG and get_link failed (meaning that we 783 * cannot report link status). If not reporting, pretend 784 * we're ok. 785 */ 786 return reporting ? -1 : BMSR_LSTATUS; 787 } 788 789 /*----------------------------- Multicast list ------------------------------*/ 790 791 /* Push the promiscuity flag down to appropriate slaves */ 792 static int bond_set_promiscuity(struct bonding *bond, int inc) 793 { 794 struct list_head *iter; 795 int err = 0; 796 797 if (bond_uses_primary(bond)) { 798 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 799 800 if (curr_active) 801 err = dev_set_promiscuity(curr_active->dev, inc); 802 } else { 803 struct slave *slave; 804 805 bond_for_each_slave(bond, slave, iter) { 806 err = dev_set_promiscuity(slave->dev, inc); 807 if (err) 808 return err; 809 } 810 } 811 return err; 812 } 813 814 /* Push the allmulti flag down to all slaves */ 815 static int bond_set_allmulti(struct bonding *bond, int inc) 816 { 817 struct list_head *iter; 818 int err = 0; 819 820 if (bond_uses_primary(bond)) { 821 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 822 823 if (curr_active) 824 err = dev_set_allmulti(curr_active->dev, inc); 825 } else { 826 struct slave *slave; 827 828 bond_for_each_slave(bond, slave, iter) { 829 err = dev_set_allmulti(slave->dev, inc); 830 if (err) 831 return err; 832 } 833 } 834 return err; 835 } 836 837 /* Retrieve the list of registered multicast addresses for the bonding 838 * device and retransmit an IGMP JOIN request to the current active 839 * slave. 840 */ 841 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work) 842 { 843 struct bonding *bond = container_of(work, struct bonding, 844 mcast_work.work); 845 846 if (!rtnl_trylock()) { 847 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 848 return; 849 } 850 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev); 851 852 if (bond->igmp_retrans > 1) { 853 bond->igmp_retrans--; 854 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); 855 } 856 rtnl_unlock(); 857 } 858 859 /* Flush bond's hardware addresses from slave */ 860 static void bond_hw_addr_flush(struct net_device *bond_dev, 861 struct net_device *slave_dev) 862 { 863 struct bonding *bond = netdev_priv(bond_dev); 864 865 dev_uc_unsync(slave_dev, bond_dev); 866 dev_mc_unsync(slave_dev, bond_dev); 867 868 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 869 /* del lacpdu mc addr from mc list */ 870 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 871 872 dev_mc_del(slave_dev, lacpdu_multicast); 873 } 874 } 875 876 /*--------------------------- Active slave change ---------------------------*/ 877 878 /* Update the hardware address list and promisc/allmulti for the new and 879 * old active slaves (if any). Modes that are not using primary keep all 880 * slaves up date at all times; only the modes that use primary need to call 881 * this function to swap these settings during a failover. 882 */ 883 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active, 884 struct slave *old_active) 885 { 886 if (old_active) { 887 if (bond->dev->flags & IFF_PROMISC) 888 dev_set_promiscuity(old_active->dev, -1); 889 890 if (bond->dev->flags & IFF_ALLMULTI) 891 dev_set_allmulti(old_active->dev, -1); 892 893 bond_hw_addr_flush(bond->dev, old_active->dev); 894 } 895 896 if (new_active) { 897 /* FIXME: Signal errors upstream. */ 898 if (bond->dev->flags & IFF_PROMISC) 899 dev_set_promiscuity(new_active->dev, 1); 900 901 if (bond->dev->flags & IFF_ALLMULTI) 902 dev_set_allmulti(new_active->dev, 1); 903 904 netif_addr_lock_bh(bond->dev); 905 dev_uc_sync(new_active->dev, bond->dev); 906 dev_mc_sync(new_active->dev, bond->dev); 907 netif_addr_unlock_bh(bond->dev); 908 } 909 } 910 911 /** 912 * bond_set_dev_addr - clone slave's address to bond 913 * @bond_dev: bond net device 914 * @slave_dev: slave net device 915 * 916 * Should be called with RTNL held. 917 */ 918 static int bond_set_dev_addr(struct net_device *bond_dev, 919 struct net_device *slave_dev) 920 { 921 int err; 922 923 slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n", 924 bond_dev, slave_dev, slave_dev->addr_len); 925 err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL); 926 if (err) 927 return err; 928 929 __dev_addr_set(bond_dev, slave_dev->dev_addr, slave_dev->addr_len); 930 bond_dev->addr_assign_type = NET_ADDR_STOLEN; 931 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev); 932 return 0; 933 } 934 935 static struct slave *bond_get_old_active(struct bonding *bond, 936 struct slave *new_active) 937 { 938 struct slave *slave; 939 struct list_head *iter; 940 941 bond_for_each_slave(bond, slave, iter) { 942 if (slave == new_active) 943 continue; 944 945 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr)) 946 return slave; 947 } 948 949 return NULL; 950 } 951 952 /* bond_do_fail_over_mac 953 * 954 * Perform special MAC address swapping for fail_over_mac settings 955 * 956 * Called with RTNL 957 */ 958 static void bond_do_fail_over_mac(struct bonding *bond, 959 struct slave *new_active, 960 struct slave *old_active) 961 { 962 u8 tmp_mac[MAX_ADDR_LEN]; 963 struct sockaddr_storage ss; 964 int rv; 965 966 switch (bond->params.fail_over_mac) { 967 case BOND_FOM_ACTIVE: 968 if (new_active) { 969 rv = bond_set_dev_addr(bond->dev, new_active->dev); 970 if (rv) 971 slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n", 972 -rv); 973 } 974 break; 975 case BOND_FOM_FOLLOW: 976 /* if new_active && old_active, swap them 977 * if just old_active, do nothing (going to no active slave) 978 * if just new_active, set new_active to bond's MAC 979 */ 980 if (!new_active) 981 return; 982 983 if (!old_active) 984 old_active = bond_get_old_active(bond, new_active); 985 986 if (old_active) { 987 bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr, 988 new_active->dev->addr_len); 989 bond_hw_addr_copy(ss.__data, 990 old_active->dev->dev_addr, 991 old_active->dev->addr_len); 992 ss.ss_family = new_active->dev->type; 993 } else { 994 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr, 995 bond->dev->addr_len); 996 ss.ss_family = bond->dev->type; 997 } 998 999 rv = dev_set_mac_address(new_active->dev, 1000 (struct sockaddr *)&ss, NULL); 1001 if (rv) { 1002 slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n", 1003 -rv); 1004 goto out; 1005 } 1006 1007 if (!old_active) 1008 goto out; 1009 1010 bond_hw_addr_copy(ss.__data, tmp_mac, 1011 new_active->dev->addr_len); 1012 ss.ss_family = old_active->dev->type; 1013 1014 rv = dev_set_mac_address(old_active->dev, 1015 (struct sockaddr *)&ss, NULL); 1016 if (rv) 1017 slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n", 1018 -rv); 1019 out: 1020 break; 1021 default: 1022 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n", 1023 bond->params.fail_over_mac); 1024 break; 1025 } 1026 1027 } 1028 1029 static struct slave *bond_choose_primary_or_current(struct bonding *bond) 1030 { 1031 struct slave *prim = rtnl_dereference(bond->primary_slave); 1032 struct slave *curr = rtnl_dereference(bond->curr_active_slave); 1033 1034 if (!prim || prim->link != BOND_LINK_UP) { 1035 if (!curr || curr->link != BOND_LINK_UP) 1036 return NULL; 1037 return curr; 1038 } 1039 1040 if (bond->force_primary) { 1041 bond->force_primary = false; 1042 return prim; 1043 } 1044 1045 if (!curr || curr->link != BOND_LINK_UP) 1046 return prim; 1047 1048 /* At this point, prim and curr are both up */ 1049 switch (bond->params.primary_reselect) { 1050 case BOND_PRI_RESELECT_ALWAYS: 1051 return prim; 1052 case BOND_PRI_RESELECT_BETTER: 1053 if (prim->speed < curr->speed) 1054 return curr; 1055 if (prim->speed == curr->speed && prim->duplex <= curr->duplex) 1056 return curr; 1057 return prim; 1058 case BOND_PRI_RESELECT_FAILURE: 1059 return curr; 1060 default: 1061 netdev_err(bond->dev, "impossible primary_reselect %d\n", 1062 bond->params.primary_reselect); 1063 return curr; 1064 } 1065 } 1066 1067 /** 1068 * bond_find_best_slave - select the best available slave to be the active one 1069 * @bond: our bonding struct 1070 */ 1071 static struct slave *bond_find_best_slave(struct bonding *bond) 1072 { 1073 struct slave *slave, *bestslave = NULL; 1074 struct list_head *iter; 1075 int mintime = bond->params.updelay; 1076 1077 slave = bond_choose_primary_or_current(bond); 1078 if (slave) 1079 return slave; 1080 1081 bond_for_each_slave(bond, slave, iter) { 1082 if (slave->link == BOND_LINK_UP) 1083 return slave; 1084 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) && 1085 slave->delay < mintime) { 1086 mintime = slave->delay; 1087 bestslave = slave; 1088 } 1089 } 1090 1091 return bestslave; 1092 } 1093 1094 static bool bond_should_notify_peers(struct bonding *bond) 1095 { 1096 struct slave *slave; 1097 1098 rcu_read_lock(); 1099 slave = rcu_dereference(bond->curr_active_slave); 1100 rcu_read_unlock(); 1101 1102 if (!slave || !bond->send_peer_notif || 1103 bond->send_peer_notif % 1104 max(1, bond->params.peer_notif_delay) != 0 || 1105 !netif_carrier_ok(bond->dev) || 1106 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) 1107 return false; 1108 1109 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n", 1110 slave ? slave->dev->name : "NULL"); 1111 1112 return true; 1113 } 1114 1115 /** 1116 * bond_change_active_slave - change the active slave into the specified one 1117 * @bond: our bonding struct 1118 * @new_active: the new slave to make the active one 1119 * 1120 * Set the new slave to the bond's settings and unset them on the old 1121 * curr_active_slave. 1122 * Setting include flags, mc-list, promiscuity, allmulti, etc. 1123 * 1124 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, 1125 * because it is apparently the best available slave we have, even though its 1126 * updelay hasn't timed out yet. 1127 * 1128 * Caller must hold RTNL. 1129 */ 1130 void bond_change_active_slave(struct bonding *bond, struct slave *new_active) 1131 { 1132 struct slave *old_active; 1133 1134 ASSERT_RTNL(); 1135 1136 old_active = rtnl_dereference(bond->curr_active_slave); 1137 1138 if (old_active == new_active) 1139 return; 1140 1141 #ifdef CONFIG_XFRM_OFFLOAD 1142 bond_ipsec_del_sa_all(bond); 1143 #endif /* CONFIG_XFRM_OFFLOAD */ 1144 1145 if (new_active) { 1146 new_active->last_link_up = jiffies; 1147 1148 if (new_active->link == BOND_LINK_BACK) { 1149 if (bond_uses_primary(bond)) { 1150 slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n", 1151 (bond->params.updelay - new_active->delay) * bond->params.miimon); 1152 } 1153 1154 new_active->delay = 0; 1155 bond_set_slave_link_state(new_active, BOND_LINK_UP, 1156 BOND_SLAVE_NOTIFY_NOW); 1157 1158 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1159 bond_3ad_handle_link_change(new_active, BOND_LINK_UP); 1160 1161 if (bond_is_lb(bond)) 1162 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); 1163 } else { 1164 if (bond_uses_primary(bond)) 1165 slave_info(bond->dev, new_active->dev, "making interface the new active one\n"); 1166 } 1167 } 1168 1169 if (bond_uses_primary(bond)) 1170 bond_hw_addr_swap(bond, new_active, old_active); 1171 1172 if (bond_is_lb(bond)) { 1173 bond_alb_handle_active_change(bond, new_active); 1174 if (old_active) 1175 bond_set_slave_inactive_flags(old_active, 1176 BOND_SLAVE_NOTIFY_NOW); 1177 if (new_active) 1178 bond_set_slave_active_flags(new_active, 1179 BOND_SLAVE_NOTIFY_NOW); 1180 } else { 1181 rcu_assign_pointer(bond->curr_active_slave, new_active); 1182 } 1183 1184 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) { 1185 if (old_active) 1186 bond_set_slave_inactive_flags(old_active, 1187 BOND_SLAVE_NOTIFY_NOW); 1188 1189 if (new_active) { 1190 bool should_notify_peers = false; 1191 1192 bond_set_slave_active_flags(new_active, 1193 BOND_SLAVE_NOTIFY_NOW); 1194 1195 if (bond->params.fail_over_mac) 1196 bond_do_fail_over_mac(bond, new_active, 1197 old_active); 1198 1199 if (netif_running(bond->dev)) { 1200 bond->send_peer_notif = 1201 bond->params.num_peer_notif * 1202 max(1, bond->params.peer_notif_delay); 1203 should_notify_peers = 1204 bond_should_notify_peers(bond); 1205 } 1206 1207 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev); 1208 if (should_notify_peers) { 1209 bond->send_peer_notif--; 1210 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 1211 bond->dev); 1212 } 1213 } 1214 } 1215 1216 #ifdef CONFIG_XFRM_OFFLOAD 1217 bond_ipsec_add_sa_all(bond); 1218 #endif /* CONFIG_XFRM_OFFLOAD */ 1219 1220 /* resend IGMP joins since active slave has changed or 1221 * all were sent on curr_active_slave. 1222 * resend only if bond is brought up with the affected 1223 * bonding modes and the retransmission is enabled 1224 */ 1225 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && 1226 ((bond_uses_primary(bond) && new_active) || 1227 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) { 1228 bond->igmp_retrans = bond->params.resend_igmp; 1229 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 1230 } 1231 } 1232 1233 /** 1234 * bond_select_active_slave - select a new active slave, if needed 1235 * @bond: our bonding struct 1236 * 1237 * This functions should be called when one of the following occurs: 1238 * - The old curr_active_slave has been released or lost its link. 1239 * - The primary_slave has got its link back. 1240 * - A slave has got its link back and there's no old curr_active_slave. 1241 * 1242 * Caller must hold RTNL. 1243 */ 1244 void bond_select_active_slave(struct bonding *bond) 1245 { 1246 struct slave *best_slave; 1247 int rv; 1248 1249 ASSERT_RTNL(); 1250 1251 best_slave = bond_find_best_slave(bond); 1252 if (best_slave != rtnl_dereference(bond->curr_active_slave)) { 1253 bond_change_active_slave(bond, best_slave); 1254 rv = bond_set_carrier(bond); 1255 if (!rv) 1256 return; 1257 1258 if (netif_carrier_ok(bond->dev)) 1259 netdev_info(bond->dev, "active interface up!\n"); 1260 else 1261 netdev_info(bond->dev, "now running without any active interface!\n"); 1262 } 1263 } 1264 1265 #ifdef CONFIG_NET_POLL_CONTROLLER 1266 static inline int slave_enable_netpoll(struct slave *slave) 1267 { 1268 struct netpoll *np; 1269 int err = 0; 1270 1271 np = kzalloc(sizeof(*np), GFP_KERNEL); 1272 err = -ENOMEM; 1273 if (!np) 1274 goto out; 1275 1276 err = __netpoll_setup(np, slave->dev); 1277 if (err) { 1278 kfree(np); 1279 goto out; 1280 } 1281 slave->np = np; 1282 out: 1283 return err; 1284 } 1285 static inline void slave_disable_netpoll(struct slave *slave) 1286 { 1287 struct netpoll *np = slave->np; 1288 1289 if (!np) 1290 return; 1291 1292 slave->np = NULL; 1293 1294 __netpoll_free(np); 1295 } 1296 1297 static void bond_poll_controller(struct net_device *bond_dev) 1298 { 1299 struct bonding *bond = netdev_priv(bond_dev); 1300 struct slave *slave = NULL; 1301 struct list_head *iter; 1302 struct ad_info ad_info; 1303 1304 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1305 if (bond_3ad_get_active_agg_info(bond, &ad_info)) 1306 return; 1307 1308 bond_for_each_slave_rcu(bond, slave, iter) { 1309 if (!bond_slave_is_up(slave)) 1310 continue; 1311 1312 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1313 struct aggregator *agg = 1314 SLAVE_AD_INFO(slave)->port.aggregator; 1315 1316 if (agg && 1317 agg->aggregator_identifier != ad_info.aggregator_id) 1318 continue; 1319 } 1320 1321 netpoll_poll_dev(slave->dev); 1322 } 1323 } 1324 1325 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1326 { 1327 struct bonding *bond = netdev_priv(bond_dev); 1328 struct list_head *iter; 1329 struct slave *slave; 1330 1331 bond_for_each_slave(bond, slave, iter) 1332 if (bond_slave_is_up(slave)) 1333 slave_disable_netpoll(slave); 1334 } 1335 1336 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) 1337 { 1338 struct bonding *bond = netdev_priv(dev); 1339 struct list_head *iter; 1340 struct slave *slave; 1341 int err = 0; 1342 1343 bond_for_each_slave(bond, slave, iter) { 1344 err = slave_enable_netpoll(slave); 1345 if (err) { 1346 bond_netpoll_cleanup(dev); 1347 break; 1348 } 1349 } 1350 return err; 1351 } 1352 #else 1353 static inline int slave_enable_netpoll(struct slave *slave) 1354 { 1355 return 0; 1356 } 1357 static inline void slave_disable_netpoll(struct slave *slave) 1358 { 1359 } 1360 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1361 { 1362 } 1363 #endif 1364 1365 /*---------------------------------- IOCTL ----------------------------------*/ 1366 1367 static netdev_features_t bond_fix_features(struct net_device *dev, 1368 netdev_features_t features) 1369 { 1370 struct bonding *bond = netdev_priv(dev); 1371 struct list_head *iter; 1372 netdev_features_t mask; 1373 struct slave *slave; 1374 1375 #if IS_ENABLED(CONFIG_TLS_DEVICE) 1376 if (bond_sk_check(bond)) 1377 features |= BOND_TLS_FEATURES; 1378 else 1379 features &= ~BOND_TLS_FEATURES; 1380 #endif 1381 1382 mask = features; 1383 1384 features &= ~NETIF_F_ONE_FOR_ALL; 1385 features |= NETIF_F_ALL_FOR_ALL; 1386 1387 bond_for_each_slave(bond, slave, iter) { 1388 features = netdev_increment_features(features, 1389 slave->dev->features, 1390 mask); 1391 } 1392 features = netdev_add_tso_features(features, mask); 1393 1394 return features; 1395 } 1396 1397 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1398 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | \ 1399 NETIF_F_HIGHDMA | NETIF_F_LRO) 1400 1401 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1402 NETIF_F_RXCSUM | NETIF_F_GSO_SOFTWARE) 1403 1404 #define BOND_MPLS_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1405 NETIF_F_GSO_SOFTWARE) 1406 1407 1408 static void bond_compute_features(struct bonding *bond) 1409 { 1410 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE | 1411 IFF_XMIT_DST_RELEASE_PERM; 1412 netdev_features_t vlan_features = BOND_VLAN_FEATURES; 1413 netdev_features_t enc_features = BOND_ENC_FEATURES; 1414 #ifdef CONFIG_XFRM_OFFLOAD 1415 netdev_features_t xfrm_features = BOND_XFRM_FEATURES; 1416 #endif /* CONFIG_XFRM_OFFLOAD */ 1417 netdev_features_t mpls_features = BOND_MPLS_FEATURES; 1418 struct net_device *bond_dev = bond->dev; 1419 struct list_head *iter; 1420 struct slave *slave; 1421 unsigned short max_hard_header_len = ETH_HLEN; 1422 unsigned int tso_max_size = TSO_MAX_SIZE; 1423 u16 tso_max_segs = TSO_MAX_SEGS; 1424 1425 if (!bond_has_slaves(bond)) 1426 goto done; 1427 vlan_features &= NETIF_F_ALL_FOR_ALL; 1428 mpls_features &= NETIF_F_ALL_FOR_ALL; 1429 1430 bond_for_each_slave(bond, slave, iter) { 1431 vlan_features = netdev_increment_features(vlan_features, 1432 slave->dev->vlan_features, BOND_VLAN_FEATURES); 1433 1434 enc_features = netdev_increment_features(enc_features, 1435 slave->dev->hw_enc_features, 1436 BOND_ENC_FEATURES); 1437 1438 #ifdef CONFIG_XFRM_OFFLOAD 1439 xfrm_features = netdev_increment_features(xfrm_features, 1440 slave->dev->hw_enc_features, 1441 BOND_XFRM_FEATURES); 1442 #endif /* CONFIG_XFRM_OFFLOAD */ 1443 1444 mpls_features = netdev_increment_features(mpls_features, 1445 slave->dev->mpls_features, 1446 BOND_MPLS_FEATURES); 1447 1448 dst_release_flag &= slave->dev->priv_flags; 1449 if (slave->dev->hard_header_len > max_hard_header_len) 1450 max_hard_header_len = slave->dev->hard_header_len; 1451 1452 tso_max_size = min(tso_max_size, slave->dev->tso_max_size); 1453 tso_max_segs = min(tso_max_segs, slave->dev->tso_max_segs); 1454 } 1455 bond_dev->hard_header_len = max_hard_header_len; 1456 1457 done: 1458 bond_dev->vlan_features = vlan_features; 1459 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL | 1460 NETIF_F_HW_VLAN_CTAG_TX | 1461 NETIF_F_HW_VLAN_STAG_TX; 1462 #ifdef CONFIG_XFRM_OFFLOAD 1463 bond_dev->hw_enc_features |= xfrm_features; 1464 #endif /* CONFIG_XFRM_OFFLOAD */ 1465 bond_dev->mpls_features = mpls_features; 1466 netif_set_tso_max_segs(bond_dev, tso_max_segs); 1467 netif_set_tso_max_size(bond_dev, tso_max_size); 1468 1469 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1470 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) && 1471 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM)) 1472 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE; 1473 1474 netdev_change_features(bond_dev); 1475 } 1476 1477 static void bond_setup_by_slave(struct net_device *bond_dev, 1478 struct net_device *slave_dev) 1479 { 1480 bond_dev->header_ops = slave_dev->header_ops; 1481 1482 bond_dev->type = slave_dev->type; 1483 bond_dev->hard_header_len = slave_dev->hard_header_len; 1484 bond_dev->needed_headroom = slave_dev->needed_headroom; 1485 bond_dev->addr_len = slave_dev->addr_len; 1486 1487 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1488 slave_dev->addr_len); 1489 } 1490 1491 /* On bonding slaves other than the currently active slave, suppress 1492 * duplicates except for alb non-mcast/bcast. 1493 */ 1494 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1495 struct slave *slave, 1496 struct bonding *bond) 1497 { 1498 if (bond_is_slave_inactive(slave)) { 1499 if (BOND_MODE(bond) == BOND_MODE_ALB && 1500 skb->pkt_type != PACKET_BROADCAST && 1501 skb->pkt_type != PACKET_MULTICAST) 1502 return false; 1503 return true; 1504 } 1505 return false; 1506 } 1507 1508 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1509 { 1510 struct sk_buff *skb = *pskb; 1511 struct slave *slave; 1512 struct bonding *bond; 1513 int (*recv_probe)(const struct sk_buff *, struct bonding *, 1514 struct slave *); 1515 int ret = RX_HANDLER_ANOTHER; 1516 1517 skb = skb_share_check(skb, GFP_ATOMIC); 1518 if (unlikely(!skb)) 1519 return RX_HANDLER_CONSUMED; 1520 1521 *pskb = skb; 1522 1523 slave = bond_slave_get_rcu(skb->dev); 1524 bond = slave->bond; 1525 1526 recv_probe = READ_ONCE(bond->recv_probe); 1527 if (recv_probe) { 1528 ret = recv_probe(skb, bond, slave); 1529 if (ret == RX_HANDLER_CONSUMED) { 1530 consume_skb(skb); 1531 return ret; 1532 } 1533 } 1534 1535 /* 1536 * For packets determined by bond_should_deliver_exact_match() call to 1537 * be suppressed we want to make an exception for link-local packets. 1538 * This is necessary for e.g. LLDP daemons to be able to monitor 1539 * inactive slave links without being forced to bind to them 1540 * explicitly. 1541 * 1542 * At the same time, packets that are passed to the bonding master 1543 * (including link-local ones) can have their originating interface 1544 * determined via PACKET_ORIGDEV socket option. 1545 */ 1546 if (bond_should_deliver_exact_match(skb, slave, bond)) { 1547 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest)) 1548 return RX_HANDLER_PASS; 1549 return RX_HANDLER_EXACT; 1550 } 1551 1552 skb->dev = bond->dev; 1553 1554 if (BOND_MODE(bond) == BOND_MODE_ALB && 1555 netif_is_bridge_port(bond->dev) && 1556 skb->pkt_type == PACKET_HOST) { 1557 1558 if (unlikely(skb_cow_head(skb, 1559 skb->data - skb_mac_header(skb)))) { 1560 kfree_skb(skb); 1561 return RX_HANDLER_CONSUMED; 1562 } 1563 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, 1564 bond->dev->addr_len); 1565 } 1566 1567 return ret; 1568 } 1569 1570 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond) 1571 { 1572 switch (BOND_MODE(bond)) { 1573 case BOND_MODE_ROUNDROBIN: 1574 return NETDEV_LAG_TX_TYPE_ROUNDROBIN; 1575 case BOND_MODE_ACTIVEBACKUP: 1576 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP; 1577 case BOND_MODE_BROADCAST: 1578 return NETDEV_LAG_TX_TYPE_BROADCAST; 1579 case BOND_MODE_XOR: 1580 case BOND_MODE_8023AD: 1581 return NETDEV_LAG_TX_TYPE_HASH; 1582 default: 1583 return NETDEV_LAG_TX_TYPE_UNKNOWN; 1584 } 1585 } 1586 1587 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond, 1588 enum netdev_lag_tx_type type) 1589 { 1590 if (type != NETDEV_LAG_TX_TYPE_HASH) 1591 return NETDEV_LAG_HASH_NONE; 1592 1593 switch (bond->params.xmit_policy) { 1594 case BOND_XMIT_POLICY_LAYER2: 1595 return NETDEV_LAG_HASH_L2; 1596 case BOND_XMIT_POLICY_LAYER34: 1597 return NETDEV_LAG_HASH_L34; 1598 case BOND_XMIT_POLICY_LAYER23: 1599 return NETDEV_LAG_HASH_L23; 1600 case BOND_XMIT_POLICY_ENCAP23: 1601 return NETDEV_LAG_HASH_E23; 1602 case BOND_XMIT_POLICY_ENCAP34: 1603 return NETDEV_LAG_HASH_E34; 1604 case BOND_XMIT_POLICY_VLAN_SRCMAC: 1605 return NETDEV_LAG_HASH_VLAN_SRCMAC; 1606 default: 1607 return NETDEV_LAG_HASH_UNKNOWN; 1608 } 1609 } 1610 1611 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave, 1612 struct netlink_ext_ack *extack) 1613 { 1614 struct netdev_lag_upper_info lag_upper_info; 1615 enum netdev_lag_tx_type type; 1616 1617 type = bond_lag_tx_type(bond); 1618 lag_upper_info.tx_type = type; 1619 lag_upper_info.hash_type = bond_lag_hash_type(bond, type); 1620 1621 return netdev_master_upper_dev_link(slave->dev, bond->dev, slave, 1622 &lag_upper_info, extack); 1623 } 1624 1625 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave) 1626 { 1627 netdev_upper_dev_unlink(slave->dev, bond->dev); 1628 slave->dev->flags &= ~IFF_SLAVE; 1629 } 1630 1631 static void slave_kobj_release(struct kobject *kobj) 1632 { 1633 struct slave *slave = to_slave(kobj); 1634 struct bonding *bond = bond_get_bond_by_slave(slave); 1635 1636 cancel_delayed_work_sync(&slave->notify_work); 1637 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1638 kfree(SLAVE_AD_INFO(slave)); 1639 1640 kfree(slave); 1641 } 1642 1643 static struct kobj_type slave_ktype = { 1644 .release = slave_kobj_release, 1645 #ifdef CONFIG_SYSFS 1646 .sysfs_ops = &slave_sysfs_ops, 1647 #endif 1648 }; 1649 1650 static int bond_kobj_init(struct slave *slave) 1651 { 1652 int err; 1653 1654 err = kobject_init_and_add(&slave->kobj, &slave_ktype, 1655 &(slave->dev->dev.kobj), "bonding_slave"); 1656 if (err) 1657 kobject_put(&slave->kobj); 1658 1659 return err; 1660 } 1661 1662 static struct slave *bond_alloc_slave(struct bonding *bond, 1663 struct net_device *slave_dev) 1664 { 1665 struct slave *slave = NULL; 1666 1667 slave = kzalloc(sizeof(*slave), GFP_KERNEL); 1668 if (!slave) 1669 return NULL; 1670 1671 slave->bond = bond; 1672 slave->dev = slave_dev; 1673 INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work); 1674 1675 if (bond_kobj_init(slave)) 1676 return NULL; 1677 1678 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1679 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info), 1680 GFP_KERNEL); 1681 if (!SLAVE_AD_INFO(slave)) { 1682 kobject_put(&slave->kobj); 1683 return NULL; 1684 } 1685 } 1686 1687 return slave; 1688 } 1689 1690 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info) 1691 { 1692 info->bond_mode = BOND_MODE(bond); 1693 info->miimon = bond->params.miimon; 1694 info->num_slaves = bond->slave_cnt; 1695 } 1696 1697 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info) 1698 { 1699 strcpy(info->slave_name, slave->dev->name); 1700 info->link = slave->link; 1701 info->state = bond_slave_state(slave); 1702 info->link_failure_count = slave->link_failure_count; 1703 } 1704 1705 static void bond_netdev_notify_work(struct work_struct *_work) 1706 { 1707 struct slave *slave = container_of(_work, struct slave, 1708 notify_work.work); 1709 1710 if (rtnl_trylock()) { 1711 struct netdev_bonding_info binfo; 1712 1713 bond_fill_ifslave(slave, &binfo.slave); 1714 bond_fill_ifbond(slave->bond, &binfo.master); 1715 netdev_bonding_info_change(slave->dev, &binfo); 1716 rtnl_unlock(); 1717 } else { 1718 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1); 1719 } 1720 } 1721 1722 void bond_queue_slave_event(struct slave *slave) 1723 { 1724 queue_delayed_work(slave->bond->wq, &slave->notify_work, 0); 1725 } 1726 1727 void bond_lower_state_changed(struct slave *slave) 1728 { 1729 struct netdev_lag_lower_state_info info; 1730 1731 info.link_up = slave->link == BOND_LINK_UP || 1732 slave->link == BOND_LINK_FAIL; 1733 info.tx_enabled = bond_is_active_slave(slave); 1734 netdev_lower_state_changed(slave->dev, &info); 1735 } 1736 1737 #define BOND_NL_ERR(bond_dev, extack, errmsg) do { \ 1738 if (extack) \ 1739 NL_SET_ERR_MSG(extack, errmsg); \ 1740 else \ 1741 netdev_err(bond_dev, "Error: %s\n", errmsg); \ 1742 } while (0) 1743 1744 #define SLAVE_NL_ERR(bond_dev, slave_dev, extack, errmsg) do { \ 1745 if (extack) \ 1746 NL_SET_ERR_MSG(extack, errmsg); \ 1747 else \ 1748 slave_err(bond_dev, slave_dev, "Error: %s\n", errmsg); \ 1749 } while (0) 1750 1751 /* enslave device <slave> to bond device <master> */ 1752 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev, 1753 struct netlink_ext_ack *extack) 1754 { 1755 struct bonding *bond = netdev_priv(bond_dev); 1756 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1757 struct slave *new_slave = NULL, *prev_slave; 1758 struct sockaddr_storage ss; 1759 int link_reporting; 1760 int res = 0, i; 1761 1762 if (slave_dev->flags & IFF_MASTER && 1763 !netif_is_bond_master(slave_dev)) { 1764 BOND_NL_ERR(bond_dev, extack, 1765 "Device type (master device) cannot be enslaved"); 1766 return -EPERM; 1767 } 1768 1769 if (!bond->params.use_carrier && 1770 slave_dev->ethtool_ops->get_link == NULL && 1771 slave_ops->ndo_eth_ioctl == NULL) { 1772 slave_warn(bond_dev, slave_dev, "no link monitoring support\n"); 1773 } 1774 1775 /* already in-use? */ 1776 if (netdev_is_rx_handler_busy(slave_dev)) { 1777 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1778 "Device is in use and cannot be enslaved"); 1779 return -EBUSY; 1780 } 1781 1782 if (bond_dev == slave_dev) { 1783 BOND_NL_ERR(bond_dev, extack, "Cannot enslave bond to itself."); 1784 return -EPERM; 1785 } 1786 1787 /* vlan challenged mutual exclusion */ 1788 /* no need to lock since we're protected by rtnl_lock */ 1789 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1790 slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n"); 1791 if (vlan_uses_dev(bond_dev)) { 1792 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1793 "Can not enslave VLAN challenged device to VLAN enabled bond"); 1794 return -EPERM; 1795 } else { 1796 slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n"); 1797 } 1798 } else { 1799 slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n"); 1800 } 1801 1802 if (slave_dev->features & NETIF_F_HW_ESP) 1803 slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n"); 1804 1805 /* Old ifenslave binaries are no longer supported. These can 1806 * be identified with moderate accuracy by the state of the slave: 1807 * the current ifenslave will set the interface down prior to 1808 * enslaving it; the old ifenslave will not. 1809 */ 1810 if (slave_dev->flags & IFF_UP) { 1811 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1812 "Device can not be enslaved while up"); 1813 return -EPERM; 1814 } 1815 1816 /* set bonding device ether type by slave - bonding netdevices are 1817 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1818 * there is a need to override some of the type dependent attribs/funcs. 1819 * 1820 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1821 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1822 */ 1823 if (!bond_has_slaves(bond)) { 1824 if (bond_dev->type != slave_dev->type) { 1825 slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n", 1826 bond_dev->type, slave_dev->type); 1827 1828 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, 1829 bond_dev); 1830 res = notifier_to_errno(res); 1831 if (res) { 1832 slave_err(bond_dev, slave_dev, "refused to change device type\n"); 1833 return -EBUSY; 1834 } 1835 1836 /* Flush unicast and multicast addresses */ 1837 dev_uc_flush(bond_dev); 1838 dev_mc_flush(bond_dev); 1839 1840 if (slave_dev->type != ARPHRD_ETHER) 1841 bond_setup_by_slave(bond_dev, slave_dev); 1842 else { 1843 ether_setup(bond_dev); 1844 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1845 } 1846 1847 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, 1848 bond_dev); 1849 } 1850 } else if (bond_dev->type != slave_dev->type) { 1851 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1852 "Device type is different from other slaves"); 1853 return -EINVAL; 1854 } 1855 1856 if (slave_dev->type == ARPHRD_INFINIBAND && 1857 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1858 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1859 "Only active-backup mode is supported for infiniband slaves"); 1860 res = -EOPNOTSUPP; 1861 goto err_undo_flags; 1862 } 1863 1864 if (!slave_ops->ndo_set_mac_address || 1865 slave_dev->type == ARPHRD_INFINIBAND) { 1866 slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n"); 1867 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP && 1868 bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1869 if (!bond_has_slaves(bond)) { 1870 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1871 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n"); 1872 } else { 1873 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1874 "Slave device does not support setting the MAC address, but fail_over_mac is not set to active"); 1875 res = -EOPNOTSUPP; 1876 goto err_undo_flags; 1877 } 1878 } 1879 } 1880 1881 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1882 1883 /* If this is the first slave, then we need to set the master's hardware 1884 * address to be the same as the slave's. 1885 */ 1886 if (!bond_has_slaves(bond) && 1887 bond->dev->addr_assign_type == NET_ADDR_RANDOM) { 1888 res = bond_set_dev_addr(bond->dev, slave_dev); 1889 if (res) 1890 goto err_undo_flags; 1891 } 1892 1893 new_slave = bond_alloc_slave(bond, slave_dev); 1894 if (!new_slave) { 1895 res = -ENOMEM; 1896 goto err_undo_flags; 1897 } 1898 1899 /* Set the new_slave's queue_id to be zero. Queue ID mapping 1900 * is set via sysfs or module option if desired. 1901 */ 1902 new_slave->queue_id = 0; 1903 1904 /* Save slave's original mtu and then set it to match the bond */ 1905 new_slave->original_mtu = slave_dev->mtu; 1906 res = dev_set_mtu(slave_dev, bond->dev->mtu); 1907 if (res) { 1908 slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res); 1909 goto err_free; 1910 } 1911 1912 /* Save slave's original ("permanent") mac address for modes 1913 * that need it, and for restoring it upon release, and then 1914 * set it to the master's address 1915 */ 1916 bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr, 1917 slave_dev->addr_len); 1918 1919 if (!bond->params.fail_over_mac || 1920 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1921 /* Set slave to master's mac address. The application already 1922 * set the master's mac address to that of the first slave 1923 */ 1924 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 1925 ss.ss_family = slave_dev->type; 1926 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, 1927 extack); 1928 if (res) { 1929 slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res); 1930 goto err_restore_mtu; 1931 } 1932 } 1933 1934 /* set slave flag before open to prevent IPv6 addrconf */ 1935 slave_dev->flags |= IFF_SLAVE; 1936 1937 /* open the slave since the application closed it */ 1938 res = dev_open(slave_dev, extack); 1939 if (res) { 1940 slave_err(bond_dev, slave_dev, "Opening slave failed\n"); 1941 goto err_restore_mac; 1942 } 1943 1944 slave_dev->priv_flags |= IFF_BONDING; 1945 /* initialize slave stats */ 1946 dev_get_stats(new_slave->dev, &new_slave->slave_stats); 1947 1948 if (bond_is_lb(bond)) { 1949 /* bond_alb_init_slave() must be called before all other stages since 1950 * it might fail and we do not want to have to undo everything 1951 */ 1952 res = bond_alb_init_slave(bond, new_slave); 1953 if (res) 1954 goto err_close; 1955 } 1956 1957 res = vlan_vids_add_by_dev(slave_dev, bond_dev); 1958 if (res) { 1959 slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n"); 1960 goto err_close; 1961 } 1962 1963 prev_slave = bond_last_slave(bond); 1964 1965 new_slave->delay = 0; 1966 new_slave->link_failure_count = 0; 1967 1968 if (bond_update_speed_duplex(new_slave) && 1969 bond_needs_speed_duplex(bond)) 1970 new_slave->link = BOND_LINK_DOWN; 1971 1972 new_slave->last_rx = jiffies - 1973 (msecs_to_jiffies(bond->params.arp_interval) + 1); 1974 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) 1975 new_slave->target_last_arp_rx[i] = new_slave->last_rx; 1976 1977 if (bond->params.miimon && !bond->params.use_carrier) { 1978 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 1979 1980 if ((link_reporting == -1) && !bond->params.arp_interval) { 1981 /* miimon is set but a bonded network driver 1982 * does not support ETHTOOL/MII and 1983 * arp_interval is not set. Note: if 1984 * use_carrier is enabled, we will never go 1985 * here (because netif_carrier is always 1986 * supported); thus, we don't need to change 1987 * the messages for netif_carrier. 1988 */ 1989 slave_warn(bond_dev, slave_dev, "MII and ETHTOOL support not available for slave, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n"); 1990 } else if (link_reporting == -1) { 1991 /* unable get link status using mii/ethtool */ 1992 slave_warn(bond_dev, slave_dev, "can't get link status from slave; 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"); 1993 } 1994 } 1995 1996 /* check for initial state */ 1997 new_slave->link = BOND_LINK_NOCHANGE; 1998 if (bond->params.miimon) { 1999 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { 2000 if (bond->params.updelay) { 2001 bond_set_slave_link_state(new_slave, 2002 BOND_LINK_BACK, 2003 BOND_SLAVE_NOTIFY_NOW); 2004 new_slave->delay = bond->params.updelay; 2005 } else { 2006 bond_set_slave_link_state(new_slave, 2007 BOND_LINK_UP, 2008 BOND_SLAVE_NOTIFY_NOW); 2009 } 2010 } else { 2011 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN, 2012 BOND_SLAVE_NOTIFY_NOW); 2013 } 2014 } else if (bond->params.arp_interval) { 2015 bond_set_slave_link_state(new_slave, 2016 (netif_carrier_ok(slave_dev) ? 2017 BOND_LINK_UP : BOND_LINK_DOWN), 2018 BOND_SLAVE_NOTIFY_NOW); 2019 } else { 2020 bond_set_slave_link_state(new_slave, BOND_LINK_UP, 2021 BOND_SLAVE_NOTIFY_NOW); 2022 } 2023 2024 if (new_slave->link != BOND_LINK_DOWN) 2025 new_slave->last_link_up = jiffies; 2026 slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n", 2027 new_slave->link == BOND_LINK_DOWN ? "DOWN" : 2028 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); 2029 2030 if (bond_uses_primary(bond) && bond->params.primary[0]) { 2031 /* if there is a primary slave, remember it */ 2032 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 2033 rcu_assign_pointer(bond->primary_slave, new_slave); 2034 bond->force_primary = true; 2035 } 2036 } 2037 2038 switch (BOND_MODE(bond)) { 2039 case BOND_MODE_ACTIVEBACKUP: 2040 bond_set_slave_inactive_flags(new_slave, 2041 BOND_SLAVE_NOTIFY_NOW); 2042 break; 2043 case BOND_MODE_8023AD: 2044 /* in 802.3ad mode, the internal mechanism 2045 * will activate the slaves in the selected 2046 * aggregator 2047 */ 2048 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 2049 /* if this is the first slave */ 2050 if (!prev_slave) { 2051 SLAVE_AD_INFO(new_slave)->id = 1; 2052 /* Initialize AD with the number of times that the AD timer is called in 1 second 2053 * can be called only after the mac address of the bond is set 2054 */ 2055 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL); 2056 } else { 2057 SLAVE_AD_INFO(new_slave)->id = 2058 SLAVE_AD_INFO(prev_slave)->id + 1; 2059 } 2060 2061 bond_3ad_bind_slave(new_slave); 2062 break; 2063 case BOND_MODE_TLB: 2064 case BOND_MODE_ALB: 2065 bond_set_active_slave(new_slave); 2066 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 2067 break; 2068 default: 2069 slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n"); 2070 2071 /* always active in trunk mode */ 2072 bond_set_active_slave(new_slave); 2073 2074 /* In trunking mode there is little meaning to curr_active_slave 2075 * anyway (it holds no special properties of the bond device), 2076 * so we can change it without calling change_active_interface() 2077 */ 2078 if (!rcu_access_pointer(bond->curr_active_slave) && 2079 new_slave->link == BOND_LINK_UP) 2080 rcu_assign_pointer(bond->curr_active_slave, new_slave); 2081 2082 break; 2083 } /* switch(bond_mode) */ 2084 2085 #ifdef CONFIG_NET_POLL_CONTROLLER 2086 if (bond->dev->npinfo) { 2087 if (slave_enable_netpoll(new_slave)) { 2088 slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n"); 2089 res = -EBUSY; 2090 goto err_detach; 2091 } 2092 } 2093 #endif 2094 2095 if (!(bond_dev->features & NETIF_F_LRO)) 2096 dev_disable_lro(slave_dev); 2097 2098 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 2099 new_slave); 2100 if (res) { 2101 slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res); 2102 goto err_detach; 2103 } 2104 2105 res = bond_master_upper_dev_link(bond, new_slave, extack); 2106 if (res) { 2107 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res); 2108 goto err_unregister; 2109 } 2110 2111 bond_lower_state_changed(new_slave); 2112 2113 res = bond_sysfs_slave_add(new_slave); 2114 if (res) { 2115 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res); 2116 goto err_upper_unlink; 2117 } 2118 2119 /* If the mode uses primary, then the following is handled by 2120 * bond_change_active_slave(). 2121 */ 2122 if (!bond_uses_primary(bond)) { 2123 /* set promiscuity level to new slave */ 2124 if (bond_dev->flags & IFF_PROMISC) { 2125 res = dev_set_promiscuity(slave_dev, 1); 2126 if (res) 2127 goto err_sysfs_del; 2128 } 2129 2130 /* set allmulti level to new slave */ 2131 if (bond_dev->flags & IFF_ALLMULTI) { 2132 res = dev_set_allmulti(slave_dev, 1); 2133 if (res) { 2134 if (bond_dev->flags & IFF_PROMISC) 2135 dev_set_promiscuity(slave_dev, -1); 2136 goto err_sysfs_del; 2137 } 2138 } 2139 2140 netif_addr_lock_bh(bond_dev); 2141 dev_mc_sync_multiple(slave_dev, bond_dev); 2142 dev_uc_sync_multiple(slave_dev, bond_dev); 2143 netif_addr_unlock_bh(bond_dev); 2144 2145 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 2146 /* add lacpdu mc addr to mc list */ 2147 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 2148 2149 dev_mc_add(slave_dev, lacpdu_multicast); 2150 } 2151 } 2152 2153 bond->slave_cnt++; 2154 bond_compute_features(bond); 2155 bond_set_carrier(bond); 2156 2157 if (bond_uses_primary(bond)) { 2158 block_netpoll_tx(); 2159 bond_select_active_slave(bond); 2160 unblock_netpoll_tx(); 2161 } 2162 2163 if (bond_mode_can_use_xmit_hash(bond)) 2164 bond_update_slave_arr(bond, NULL); 2165 2166 2167 if (!slave_dev->netdev_ops->ndo_bpf || 2168 !slave_dev->netdev_ops->ndo_xdp_xmit) { 2169 if (bond->xdp_prog) { 2170 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 2171 "Slave does not support XDP"); 2172 res = -EOPNOTSUPP; 2173 goto err_sysfs_del; 2174 } 2175 } else if (bond->xdp_prog) { 2176 struct netdev_bpf xdp = { 2177 .command = XDP_SETUP_PROG, 2178 .flags = 0, 2179 .prog = bond->xdp_prog, 2180 .extack = extack, 2181 }; 2182 2183 if (dev_xdp_prog_count(slave_dev) > 0) { 2184 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 2185 "Slave has XDP program loaded, please unload before enslaving"); 2186 res = -EOPNOTSUPP; 2187 goto err_sysfs_del; 2188 } 2189 2190 res = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 2191 if (res < 0) { 2192 /* ndo_bpf() sets extack error message */ 2193 slave_dbg(bond_dev, slave_dev, "Error %d calling ndo_bpf\n", res); 2194 goto err_sysfs_del; 2195 } 2196 if (bond->xdp_prog) 2197 bpf_prog_inc(bond->xdp_prog); 2198 } 2199 2200 slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n", 2201 bond_is_active_slave(new_slave) ? "an active" : "a backup", 2202 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down"); 2203 2204 /* enslave is successful */ 2205 bond_queue_slave_event(new_slave); 2206 return 0; 2207 2208 /* Undo stages on error */ 2209 err_sysfs_del: 2210 bond_sysfs_slave_del(new_slave); 2211 2212 err_upper_unlink: 2213 bond_upper_dev_unlink(bond, new_slave); 2214 2215 err_unregister: 2216 netdev_rx_handler_unregister(slave_dev); 2217 2218 err_detach: 2219 vlan_vids_del_by_dev(slave_dev, bond_dev); 2220 if (rcu_access_pointer(bond->primary_slave) == new_slave) 2221 RCU_INIT_POINTER(bond->primary_slave, NULL); 2222 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) { 2223 block_netpoll_tx(); 2224 bond_change_active_slave(bond, NULL); 2225 bond_select_active_slave(bond); 2226 unblock_netpoll_tx(); 2227 } 2228 /* either primary_slave or curr_active_slave might've changed */ 2229 synchronize_rcu(); 2230 slave_disable_netpoll(new_slave); 2231 2232 err_close: 2233 if (!netif_is_bond_master(slave_dev)) 2234 slave_dev->priv_flags &= ~IFF_BONDING; 2235 dev_close(slave_dev); 2236 2237 err_restore_mac: 2238 slave_dev->flags &= ~IFF_SLAVE; 2239 if (!bond->params.fail_over_mac || 2240 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2241 /* XXX TODO - fom follow mode needs to change master's 2242 * MAC if this slave's MAC is in use by the bond, or at 2243 * least print a warning. 2244 */ 2245 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr, 2246 new_slave->dev->addr_len); 2247 ss.ss_family = slave_dev->type; 2248 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL); 2249 } 2250 2251 err_restore_mtu: 2252 dev_set_mtu(slave_dev, new_slave->original_mtu); 2253 2254 err_free: 2255 kobject_put(&new_slave->kobj); 2256 2257 err_undo_flags: 2258 /* Enslave of first slave has failed and we need to fix master's mac */ 2259 if (!bond_has_slaves(bond)) { 2260 if (ether_addr_equal_64bits(bond_dev->dev_addr, 2261 slave_dev->dev_addr)) 2262 eth_hw_addr_random(bond_dev); 2263 if (bond_dev->type != ARPHRD_ETHER) { 2264 dev_close(bond_dev); 2265 ether_setup(bond_dev); 2266 bond_dev->flags |= IFF_MASTER; 2267 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 2268 } 2269 } 2270 2271 return res; 2272 } 2273 2274 /* Try to release the slave device <slave> from the bond device <master> 2275 * It is legal to access curr_active_slave without a lock because all the function 2276 * is RTNL-locked. If "all" is true it means that the function is being called 2277 * while destroying a bond interface and all slaves are being released. 2278 * 2279 * The rules for slave state should be: 2280 * for Active/Backup: 2281 * Active stays on all backups go down 2282 * for Bonded connections: 2283 * The first up interface should be left on and all others downed. 2284 */ 2285 static int __bond_release_one(struct net_device *bond_dev, 2286 struct net_device *slave_dev, 2287 bool all, bool unregister) 2288 { 2289 struct bonding *bond = netdev_priv(bond_dev); 2290 struct slave *slave, *oldcurrent; 2291 struct sockaddr_storage ss; 2292 int old_flags = bond_dev->flags; 2293 netdev_features_t old_features = bond_dev->features; 2294 2295 /* slave is not a slave or master is not master of this slave */ 2296 if (!(slave_dev->flags & IFF_SLAVE) || 2297 !netdev_has_upper_dev(slave_dev, bond_dev)) { 2298 slave_dbg(bond_dev, slave_dev, "cannot release slave\n"); 2299 return -EINVAL; 2300 } 2301 2302 block_netpoll_tx(); 2303 2304 slave = bond_get_slave_by_dev(bond, slave_dev); 2305 if (!slave) { 2306 /* not a slave of this bond */ 2307 slave_info(bond_dev, slave_dev, "interface not enslaved\n"); 2308 unblock_netpoll_tx(); 2309 return -EINVAL; 2310 } 2311 2312 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW); 2313 2314 bond_sysfs_slave_del(slave); 2315 2316 /* recompute stats just before removing the slave */ 2317 bond_get_stats(bond->dev, &bond->bond_stats); 2318 2319 if (bond->xdp_prog) { 2320 struct netdev_bpf xdp = { 2321 .command = XDP_SETUP_PROG, 2322 .flags = 0, 2323 .prog = NULL, 2324 .extack = NULL, 2325 }; 2326 if (slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp)) 2327 slave_warn(bond_dev, slave_dev, "failed to unload XDP program\n"); 2328 } 2329 2330 /* unregister rx_handler early so bond_handle_frame wouldn't be called 2331 * for this slave anymore. 2332 */ 2333 netdev_rx_handler_unregister(slave_dev); 2334 2335 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2336 bond_3ad_unbind_slave(slave); 2337 2338 bond_upper_dev_unlink(bond, slave); 2339 2340 if (bond_mode_can_use_xmit_hash(bond)) 2341 bond_update_slave_arr(bond, slave); 2342 2343 slave_info(bond_dev, slave_dev, "Releasing %s interface\n", 2344 bond_is_active_slave(slave) ? "active" : "backup"); 2345 2346 oldcurrent = rcu_access_pointer(bond->curr_active_slave); 2347 2348 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2349 2350 if (!all && (!bond->params.fail_over_mac || 2351 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) { 2352 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) && 2353 bond_has_slaves(bond)) 2354 slave_warn(bond_dev, slave_dev, "the permanent HWaddr of slave - %pM - is still in use by bond - set the HWaddr of slave to a different address to avoid conflicts\n", 2355 slave->perm_hwaddr); 2356 } 2357 2358 if (rtnl_dereference(bond->primary_slave) == slave) 2359 RCU_INIT_POINTER(bond->primary_slave, NULL); 2360 2361 if (oldcurrent == slave) 2362 bond_change_active_slave(bond, NULL); 2363 2364 if (bond_is_lb(bond)) { 2365 /* Must be called only after the slave has been 2366 * detached from the list and the curr_active_slave 2367 * has been cleared (if our_slave == old_current), 2368 * but before a new active slave is selected. 2369 */ 2370 bond_alb_deinit_slave(bond, slave); 2371 } 2372 2373 if (all) { 2374 RCU_INIT_POINTER(bond->curr_active_slave, NULL); 2375 } else if (oldcurrent == slave) { 2376 /* Note that we hold RTNL over this sequence, so there 2377 * is no concern that another slave add/remove event 2378 * will interfere. 2379 */ 2380 bond_select_active_slave(bond); 2381 } 2382 2383 bond_set_carrier(bond); 2384 if (!bond_has_slaves(bond)) 2385 eth_hw_addr_random(bond_dev); 2386 2387 unblock_netpoll_tx(); 2388 synchronize_rcu(); 2389 bond->slave_cnt--; 2390 2391 if (!bond_has_slaves(bond)) { 2392 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 2393 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev); 2394 } 2395 2396 bond_compute_features(bond); 2397 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 2398 (old_features & NETIF_F_VLAN_CHALLENGED)) 2399 slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n"); 2400 2401 vlan_vids_del_by_dev(slave_dev, bond_dev); 2402 2403 /* If the mode uses primary, then this case was handled above by 2404 * bond_change_active_slave(..., NULL) 2405 */ 2406 if (!bond_uses_primary(bond)) { 2407 /* unset promiscuity level from slave 2408 * NOTE: The NETDEV_CHANGEADDR call above may change the value 2409 * of the IFF_PROMISC flag in the bond_dev, but we need the 2410 * value of that flag before that change, as that was the value 2411 * when this slave was attached, so we cache at the start of the 2412 * function and use it here. Same goes for ALLMULTI below 2413 */ 2414 if (old_flags & IFF_PROMISC) 2415 dev_set_promiscuity(slave_dev, -1); 2416 2417 /* unset allmulti level from slave */ 2418 if (old_flags & IFF_ALLMULTI) 2419 dev_set_allmulti(slave_dev, -1); 2420 2421 bond_hw_addr_flush(bond_dev, slave_dev); 2422 } 2423 2424 slave_disable_netpoll(slave); 2425 2426 /* close slave before restoring its mac address */ 2427 dev_close(slave_dev); 2428 2429 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE || 2430 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2431 /* restore original ("permanent") mac address */ 2432 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr, 2433 slave->dev->addr_len); 2434 ss.ss_family = slave_dev->type; 2435 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL); 2436 } 2437 2438 if (unregister) 2439 __dev_set_mtu(slave_dev, slave->original_mtu); 2440 else 2441 dev_set_mtu(slave_dev, slave->original_mtu); 2442 2443 if (!netif_is_bond_master(slave_dev)) 2444 slave_dev->priv_flags &= ~IFF_BONDING; 2445 2446 kobject_put(&slave->kobj); 2447 2448 return 0; 2449 } 2450 2451 /* A wrapper used because of ndo_del_link */ 2452 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 2453 { 2454 return __bond_release_one(bond_dev, slave_dev, false, false); 2455 } 2456 2457 /* First release a slave and then destroy the bond if no more slaves are left. 2458 * Must be under rtnl_lock when this function is called. 2459 */ 2460 static int bond_release_and_destroy(struct net_device *bond_dev, 2461 struct net_device *slave_dev) 2462 { 2463 struct bonding *bond = netdev_priv(bond_dev); 2464 int ret; 2465 2466 ret = __bond_release_one(bond_dev, slave_dev, false, true); 2467 if (ret == 0 && !bond_has_slaves(bond) && 2468 bond_dev->reg_state != NETREG_UNREGISTERING) { 2469 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 2470 netdev_info(bond_dev, "Destroying bond\n"); 2471 bond_remove_proc_entry(bond); 2472 unregister_netdevice(bond_dev); 2473 } 2474 return ret; 2475 } 2476 2477 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info) 2478 { 2479 struct bonding *bond = netdev_priv(bond_dev); 2480 2481 bond_fill_ifbond(bond, info); 2482 } 2483 2484 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 2485 { 2486 struct bonding *bond = netdev_priv(bond_dev); 2487 struct list_head *iter; 2488 int i = 0, res = -ENODEV; 2489 struct slave *slave; 2490 2491 bond_for_each_slave(bond, slave, iter) { 2492 if (i++ == (int)info->slave_id) { 2493 res = 0; 2494 bond_fill_ifslave(slave, info); 2495 break; 2496 } 2497 } 2498 2499 return res; 2500 } 2501 2502 /*-------------------------------- Monitoring -------------------------------*/ 2503 2504 /* called with rcu_read_lock() */ 2505 static int bond_miimon_inspect(struct bonding *bond) 2506 { 2507 int link_state, commit = 0; 2508 struct list_head *iter; 2509 struct slave *slave; 2510 bool ignore_updelay; 2511 2512 ignore_updelay = !rcu_dereference(bond->curr_active_slave); 2513 2514 bond_for_each_slave_rcu(bond, slave, iter) { 2515 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 2516 2517 link_state = bond_check_dev_link(bond, slave->dev, 0); 2518 2519 switch (slave->link) { 2520 case BOND_LINK_UP: 2521 if (link_state) 2522 continue; 2523 2524 bond_propose_link_state(slave, BOND_LINK_FAIL); 2525 commit++; 2526 slave->delay = bond->params.downdelay; 2527 if (slave->delay) { 2528 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n", 2529 (BOND_MODE(bond) == 2530 BOND_MODE_ACTIVEBACKUP) ? 2531 (bond_is_active_slave(slave) ? 2532 "active " : "backup ") : "", 2533 bond->params.downdelay * bond->params.miimon); 2534 } 2535 fallthrough; 2536 case BOND_LINK_FAIL: 2537 if (link_state) { 2538 /* recovered before downdelay expired */ 2539 bond_propose_link_state(slave, BOND_LINK_UP); 2540 slave->last_link_up = jiffies; 2541 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n", 2542 (bond->params.downdelay - slave->delay) * 2543 bond->params.miimon); 2544 commit++; 2545 continue; 2546 } 2547 2548 if (slave->delay <= 0) { 2549 bond_propose_link_state(slave, BOND_LINK_DOWN); 2550 commit++; 2551 continue; 2552 } 2553 2554 slave->delay--; 2555 break; 2556 2557 case BOND_LINK_DOWN: 2558 if (!link_state) 2559 continue; 2560 2561 bond_propose_link_state(slave, BOND_LINK_BACK); 2562 commit++; 2563 slave->delay = bond->params.updelay; 2564 2565 if (slave->delay) { 2566 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n", 2567 ignore_updelay ? 0 : 2568 bond->params.updelay * 2569 bond->params.miimon); 2570 } 2571 fallthrough; 2572 case BOND_LINK_BACK: 2573 if (!link_state) { 2574 bond_propose_link_state(slave, BOND_LINK_DOWN); 2575 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n", 2576 (bond->params.updelay - slave->delay) * 2577 bond->params.miimon); 2578 commit++; 2579 continue; 2580 } 2581 2582 if (ignore_updelay) 2583 slave->delay = 0; 2584 2585 if (slave->delay <= 0) { 2586 bond_propose_link_state(slave, BOND_LINK_UP); 2587 commit++; 2588 ignore_updelay = false; 2589 continue; 2590 } 2591 2592 slave->delay--; 2593 break; 2594 } 2595 } 2596 2597 return commit; 2598 } 2599 2600 static void bond_miimon_link_change(struct bonding *bond, 2601 struct slave *slave, 2602 char link) 2603 { 2604 switch (BOND_MODE(bond)) { 2605 case BOND_MODE_8023AD: 2606 bond_3ad_handle_link_change(slave, link); 2607 break; 2608 case BOND_MODE_TLB: 2609 case BOND_MODE_ALB: 2610 bond_alb_handle_link_change(bond, slave, link); 2611 break; 2612 case BOND_MODE_XOR: 2613 bond_update_slave_arr(bond, NULL); 2614 break; 2615 } 2616 } 2617 2618 static void bond_miimon_commit(struct bonding *bond) 2619 { 2620 struct list_head *iter; 2621 struct slave *slave, *primary; 2622 2623 bond_for_each_slave(bond, slave, iter) { 2624 switch (slave->link_new_state) { 2625 case BOND_LINK_NOCHANGE: 2626 /* For 802.3ad mode, check current slave speed and 2627 * duplex again in case its port was disabled after 2628 * invalid speed/duplex reporting but recovered before 2629 * link monitoring could make a decision on the actual 2630 * link status 2631 */ 2632 if (BOND_MODE(bond) == BOND_MODE_8023AD && 2633 slave->link == BOND_LINK_UP) 2634 bond_3ad_adapter_speed_duplex_changed(slave); 2635 continue; 2636 2637 case BOND_LINK_UP: 2638 if (bond_update_speed_duplex(slave) && 2639 bond_needs_speed_duplex(bond)) { 2640 slave->link = BOND_LINK_DOWN; 2641 if (net_ratelimit()) 2642 slave_warn(bond->dev, slave->dev, 2643 "failed to get link speed/duplex\n"); 2644 continue; 2645 } 2646 bond_set_slave_link_state(slave, BOND_LINK_UP, 2647 BOND_SLAVE_NOTIFY_NOW); 2648 slave->last_link_up = jiffies; 2649 2650 primary = rtnl_dereference(bond->primary_slave); 2651 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 2652 /* prevent it from being the active one */ 2653 bond_set_backup_slave(slave); 2654 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2655 /* make it immediately active */ 2656 bond_set_active_slave(slave); 2657 } 2658 2659 slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n", 2660 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed, 2661 slave->duplex ? "full" : "half"); 2662 2663 bond_miimon_link_change(bond, slave, BOND_LINK_UP); 2664 2665 if (!bond->curr_active_slave || slave == primary) 2666 goto do_failover; 2667 2668 continue; 2669 2670 case BOND_LINK_DOWN: 2671 if (slave->link_failure_count < UINT_MAX) 2672 slave->link_failure_count++; 2673 2674 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2675 BOND_SLAVE_NOTIFY_NOW); 2676 2677 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP || 2678 BOND_MODE(bond) == BOND_MODE_8023AD) 2679 bond_set_slave_inactive_flags(slave, 2680 BOND_SLAVE_NOTIFY_NOW); 2681 2682 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n"); 2683 2684 bond_miimon_link_change(bond, slave, BOND_LINK_DOWN); 2685 2686 if (slave == rcu_access_pointer(bond->curr_active_slave)) 2687 goto do_failover; 2688 2689 continue; 2690 2691 default: 2692 slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n", 2693 slave->link_new_state); 2694 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 2695 2696 continue; 2697 } 2698 2699 do_failover: 2700 block_netpoll_tx(); 2701 bond_select_active_slave(bond); 2702 unblock_netpoll_tx(); 2703 } 2704 2705 bond_set_carrier(bond); 2706 } 2707 2708 /* bond_mii_monitor 2709 * 2710 * Really a wrapper that splits the mii monitor into two phases: an 2711 * inspection, then (if inspection indicates something needs to be done) 2712 * an acquisition of appropriate locks followed by a commit phase to 2713 * implement whatever link state changes are indicated. 2714 */ 2715 static void bond_mii_monitor(struct work_struct *work) 2716 { 2717 struct bonding *bond = container_of(work, struct bonding, 2718 mii_work.work); 2719 bool should_notify_peers = false; 2720 bool commit; 2721 unsigned long delay; 2722 struct slave *slave; 2723 struct list_head *iter; 2724 2725 delay = msecs_to_jiffies(bond->params.miimon); 2726 2727 if (!bond_has_slaves(bond)) 2728 goto re_arm; 2729 2730 rcu_read_lock(); 2731 should_notify_peers = bond_should_notify_peers(bond); 2732 commit = !!bond_miimon_inspect(bond); 2733 if (bond->send_peer_notif) { 2734 rcu_read_unlock(); 2735 if (rtnl_trylock()) { 2736 bond->send_peer_notif--; 2737 rtnl_unlock(); 2738 } 2739 } else { 2740 rcu_read_unlock(); 2741 } 2742 2743 if (commit) { 2744 /* Race avoidance with bond_close cancel of workqueue */ 2745 if (!rtnl_trylock()) { 2746 delay = 1; 2747 should_notify_peers = false; 2748 goto re_arm; 2749 } 2750 2751 bond_for_each_slave(bond, slave, iter) { 2752 bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER); 2753 } 2754 bond_miimon_commit(bond); 2755 2756 rtnl_unlock(); /* might sleep, hold no other locks */ 2757 } 2758 2759 re_arm: 2760 if (bond->params.miimon) 2761 queue_delayed_work(bond->wq, &bond->mii_work, delay); 2762 2763 if (should_notify_peers) { 2764 if (!rtnl_trylock()) 2765 return; 2766 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); 2767 rtnl_unlock(); 2768 } 2769 } 2770 2771 static int bond_upper_dev_walk(struct net_device *upper, 2772 struct netdev_nested_priv *priv) 2773 { 2774 __be32 ip = *(__be32 *)priv->data; 2775 2776 return ip == bond_confirm_addr(upper, 0, ip); 2777 } 2778 2779 static bool bond_has_this_ip(struct bonding *bond, __be32 ip) 2780 { 2781 struct netdev_nested_priv priv = { 2782 .data = (void *)&ip, 2783 }; 2784 bool ret = false; 2785 2786 if (ip == bond_confirm_addr(bond->dev, 0, ip)) 2787 return true; 2788 2789 rcu_read_lock(); 2790 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &priv)) 2791 ret = true; 2792 rcu_read_unlock(); 2793 2794 return ret; 2795 } 2796 2797 static bool bond_handle_vlan(struct slave *slave, struct bond_vlan_tag *tags, 2798 struct sk_buff *skb) 2799 { 2800 struct net_device *bond_dev = slave->bond->dev; 2801 struct net_device *slave_dev = slave->dev; 2802 struct bond_vlan_tag *outer_tag = tags; 2803 2804 if (!tags || tags->vlan_proto == VLAN_N_VID) 2805 return true; 2806 2807 tags++; 2808 2809 /* Go through all the tags backwards and add them to the packet */ 2810 while (tags->vlan_proto != VLAN_N_VID) { 2811 if (!tags->vlan_id) { 2812 tags++; 2813 continue; 2814 } 2815 2816 slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n", 2817 ntohs(outer_tag->vlan_proto), tags->vlan_id); 2818 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto, 2819 tags->vlan_id); 2820 if (!skb) { 2821 net_err_ratelimited("failed to insert inner VLAN tag\n"); 2822 return false; 2823 } 2824 2825 tags++; 2826 } 2827 /* Set the outer tag */ 2828 if (outer_tag->vlan_id) { 2829 slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n", 2830 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id); 2831 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto, 2832 outer_tag->vlan_id); 2833 } 2834 2835 return true; 2836 } 2837 2838 /* We go to the (large) trouble of VLAN tagging ARP frames because 2839 * switches in VLAN mode (especially if ports are configured as 2840 * "native" to a VLAN) might not pass non-tagged frames. 2841 */ 2842 static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip, 2843 __be32 src_ip, struct bond_vlan_tag *tags) 2844 { 2845 struct net_device *bond_dev = slave->bond->dev; 2846 struct net_device *slave_dev = slave->dev; 2847 struct sk_buff *skb; 2848 2849 slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n", 2850 arp_op, &dest_ip, &src_ip); 2851 2852 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2853 NULL, slave_dev->dev_addr, NULL); 2854 2855 if (!skb) { 2856 net_err_ratelimited("ARP packet allocation failed\n"); 2857 return; 2858 } 2859 2860 if (bond_handle_vlan(slave, tags, skb)) 2861 arp_xmit(skb); 2862 return; 2863 } 2864 2865 /* Validate the device path between the @start_dev and the @end_dev. 2866 * The path is valid if the @end_dev is reachable through device 2867 * stacking. 2868 * When the path is validated, collect any vlan information in the 2869 * path. 2870 */ 2871 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev, 2872 struct net_device *end_dev, 2873 int level) 2874 { 2875 struct bond_vlan_tag *tags; 2876 struct net_device *upper; 2877 struct list_head *iter; 2878 2879 if (start_dev == end_dev) { 2880 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC); 2881 if (!tags) 2882 return ERR_PTR(-ENOMEM); 2883 tags[level].vlan_proto = VLAN_N_VID; 2884 return tags; 2885 } 2886 2887 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) { 2888 tags = bond_verify_device_path(upper, end_dev, level + 1); 2889 if (IS_ERR_OR_NULL(tags)) { 2890 if (IS_ERR(tags)) 2891 return tags; 2892 continue; 2893 } 2894 if (is_vlan_dev(upper)) { 2895 tags[level].vlan_proto = vlan_dev_vlan_proto(upper); 2896 tags[level].vlan_id = vlan_dev_vlan_id(upper); 2897 } 2898 2899 return tags; 2900 } 2901 2902 return NULL; 2903 } 2904 2905 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2906 { 2907 struct rtable *rt; 2908 struct bond_vlan_tag *tags; 2909 __be32 *targets = bond->params.arp_targets, addr; 2910 int i; 2911 2912 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) { 2913 slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n", 2914 __func__, &targets[i]); 2915 tags = NULL; 2916 2917 /* Find out through which dev should the packet go */ 2918 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 2919 RTO_ONLINK, 0); 2920 if (IS_ERR(rt)) { 2921 /* there's no route to target - try to send arp 2922 * probe to generate any traffic (arp_validate=0) 2923 */ 2924 if (bond->params.arp_validate) 2925 pr_warn_once("%s: no route to arp_ip_target %pI4 and arp_validate is set\n", 2926 bond->dev->name, 2927 &targets[i]); 2928 bond_arp_send(slave, ARPOP_REQUEST, targets[i], 2929 0, tags); 2930 continue; 2931 } 2932 2933 /* bond device itself */ 2934 if (rt->dst.dev == bond->dev) 2935 goto found; 2936 2937 rcu_read_lock(); 2938 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0); 2939 rcu_read_unlock(); 2940 2941 if (!IS_ERR_OR_NULL(tags)) 2942 goto found; 2943 2944 /* Not our device - skip */ 2945 slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n", 2946 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL"); 2947 2948 ip_rt_put(rt); 2949 continue; 2950 2951 found: 2952 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0); 2953 ip_rt_put(rt); 2954 bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags); 2955 kfree(tags); 2956 } 2957 } 2958 2959 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 2960 { 2961 int i; 2962 2963 if (!sip || !bond_has_this_ip(bond, tip)) { 2964 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n", 2965 __func__, &sip, &tip); 2966 return; 2967 } 2968 2969 i = bond_get_targets_ip(bond->params.arp_targets, sip); 2970 if (i == -1) { 2971 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n", 2972 __func__, &sip); 2973 return; 2974 } 2975 slave->last_rx = jiffies; 2976 slave->target_last_arp_rx[i] = jiffies; 2977 } 2978 2979 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, 2980 struct slave *slave) 2981 { 2982 struct arphdr *arp = (struct arphdr *)skb->data; 2983 struct slave *curr_active_slave, *curr_arp_slave; 2984 unsigned char *arp_ptr; 2985 __be32 sip, tip; 2986 unsigned int alen; 2987 2988 alen = arp_hdr_len(bond->dev); 2989 2990 if (alen > skb_headlen(skb)) { 2991 arp = kmalloc(alen, GFP_ATOMIC); 2992 if (!arp) 2993 goto out_unlock; 2994 if (skb_copy_bits(skb, 0, arp, alen) < 0) 2995 goto out_unlock; 2996 } 2997 2998 if (arp->ar_hln != bond->dev->addr_len || 2999 skb->pkt_type == PACKET_OTHERHOST || 3000 skb->pkt_type == PACKET_LOOPBACK || 3001 arp->ar_hrd != htons(ARPHRD_ETHER) || 3002 arp->ar_pro != htons(ETH_P_IP) || 3003 arp->ar_pln != 4) 3004 goto out_unlock; 3005 3006 arp_ptr = (unsigned char *)(arp + 1); 3007 arp_ptr += bond->dev->addr_len; 3008 memcpy(&sip, arp_ptr, 4); 3009 arp_ptr += 4 + bond->dev->addr_len; 3010 memcpy(&tip, arp_ptr, 4); 3011 3012 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n", 3013 __func__, slave->dev->name, bond_slave_state(slave), 3014 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 3015 &sip, &tip); 3016 3017 curr_active_slave = rcu_dereference(bond->curr_active_slave); 3018 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 3019 3020 /* We 'trust' the received ARP enough to validate it if: 3021 * 3022 * (a) the slave receiving the ARP is active (which includes the 3023 * current ARP slave, if any), or 3024 * 3025 * (b) the receiving slave isn't active, but there is a currently 3026 * active slave and it received valid arp reply(s) after it became 3027 * the currently active slave, or 3028 * 3029 * (c) there is an ARP slave that sent an ARP during the prior ARP 3030 * interval, and we receive an ARP reply on any slave. We accept 3031 * these because switch FDB update delays may deliver the ARP 3032 * reply to a slave other than the sender of the ARP request. 3033 * 3034 * Note: for (b), backup slaves are receiving the broadcast ARP 3035 * request, not a reply. This request passes from the sending 3036 * slave through the L2 switch(es) to the receiving slave. Since 3037 * this is checking the request, sip/tip are swapped for 3038 * validation. 3039 * 3040 * This is done to avoid endless looping when we can't reach the 3041 * arp_ip_target and fool ourselves with our own arp requests. 3042 */ 3043 if (bond_is_active_slave(slave)) 3044 bond_validate_arp(bond, slave, sip, tip); 3045 else if (curr_active_slave && 3046 time_after(slave_last_rx(bond, curr_active_slave), 3047 curr_active_slave->last_link_up)) 3048 bond_validate_arp(bond, slave, tip, sip); 3049 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) && 3050 bond_time_in_interval(bond, 3051 dev_trans_start(curr_arp_slave->dev), 1)) 3052 bond_validate_arp(bond, slave, sip, tip); 3053 3054 out_unlock: 3055 if (arp != (struct arphdr *)skb->data) 3056 kfree(arp); 3057 return RX_HANDLER_ANOTHER; 3058 } 3059 3060 #if IS_ENABLED(CONFIG_IPV6) 3061 static void bond_ns_send(struct slave *slave, const struct in6_addr *daddr, 3062 const struct in6_addr *saddr, struct bond_vlan_tag *tags) 3063 { 3064 struct net_device *bond_dev = slave->bond->dev; 3065 struct net_device *slave_dev = slave->dev; 3066 struct in6_addr mcaddr; 3067 struct sk_buff *skb; 3068 3069 slave_dbg(bond_dev, slave_dev, "NS on slave: dst %pI6c src %pI6c\n", 3070 daddr, saddr); 3071 3072 skb = ndisc_ns_create(slave_dev, daddr, saddr, 0); 3073 if (!skb) { 3074 net_err_ratelimited("NS packet allocation failed\n"); 3075 return; 3076 } 3077 3078 addrconf_addr_solict_mult(daddr, &mcaddr); 3079 if (bond_handle_vlan(slave, tags, skb)) 3080 ndisc_send_skb(skb, &mcaddr, saddr); 3081 } 3082 3083 static void bond_ns_send_all(struct bonding *bond, struct slave *slave) 3084 { 3085 struct in6_addr *targets = bond->params.ns_targets; 3086 struct bond_vlan_tag *tags; 3087 struct dst_entry *dst; 3088 struct in6_addr saddr; 3089 struct flowi6 fl6; 3090 int i; 3091 3092 for (i = 0; i < BOND_MAX_NS_TARGETS && !ipv6_addr_any(&targets[i]); i++) { 3093 slave_dbg(bond->dev, slave->dev, "%s: target %pI6c\n", 3094 __func__, &targets[i]); 3095 tags = NULL; 3096 3097 /* Find out through which dev should the packet go */ 3098 memset(&fl6, 0, sizeof(struct flowi6)); 3099 fl6.daddr = targets[i]; 3100 fl6.flowi6_oif = bond->dev->ifindex; 3101 3102 dst = ip6_route_output(dev_net(bond->dev), NULL, &fl6); 3103 if (dst->error) { 3104 dst_release(dst); 3105 /* there's no route to target - try to send arp 3106 * probe to generate any traffic (arp_validate=0) 3107 */ 3108 if (bond->params.arp_validate) 3109 pr_warn_once("%s: no route to ns_ip6_target %pI6c and arp_validate is set\n", 3110 bond->dev->name, 3111 &targets[i]); 3112 bond_ns_send(slave, &targets[i], &in6addr_any, tags); 3113 continue; 3114 } 3115 3116 /* bond device itself */ 3117 if (dst->dev == bond->dev) 3118 goto found; 3119 3120 rcu_read_lock(); 3121 tags = bond_verify_device_path(bond->dev, dst->dev, 0); 3122 rcu_read_unlock(); 3123 3124 if (!IS_ERR_OR_NULL(tags)) 3125 goto found; 3126 3127 /* Not our device - skip */ 3128 slave_dbg(bond->dev, slave->dev, "no path to ns_ip6_target %pI6c via dst->dev %s\n", 3129 &targets[i], dst->dev ? dst->dev->name : "NULL"); 3130 3131 dst_release(dst); 3132 continue; 3133 3134 found: 3135 if (!ipv6_dev_get_saddr(dev_net(dst->dev), dst->dev, &targets[i], 0, &saddr)) 3136 bond_ns_send(slave, &targets[i], &saddr, tags); 3137 dst_release(dst); 3138 kfree(tags); 3139 } 3140 } 3141 3142 static int bond_confirm_addr6(struct net_device *dev, 3143 struct netdev_nested_priv *priv) 3144 { 3145 struct in6_addr *addr = (struct in6_addr *)priv->data; 3146 3147 return ipv6_chk_addr(dev_net(dev), addr, dev, 0); 3148 } 3149 3150 static bool bond_has_this_ip6(struct bonding *bond, struct in6_addr *addr) 3151 { 3152 struct netdev_nested_priv priv = { 3153 .data = addr, 3154 }; 3155 int ret = false; 3156 3157 if (bond_confirm_addr6(bond->dev, &priv)) 3158 return true; 3159 3160 rcu_read_lock(); 3161 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_confirm_addr6, &priv)) 3162 ret = true; 3163 rcu_read_unlock(); 3164 3165 return ret; 3166 } 3167 3168 static void bond_validate_ns(struct bonding *bond, struct slave *slave, 3169 struct in6_addr *saddr, struct in6_addr *daddr) 3170 { 3171 int i; 3172 3173 if (ipv6_addr_any(saddr) || !bond_has_this_ip6(bond, daddr)) { 3174 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c tip %pI6c not found\n", 3175 __func__, saddr, daddr); 3176 return; 3177 } 3178 3179 i = bond_get_targets_ip6(bond->params.ns_targets, saddr); 3180 if (i == -1) { 3181 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c not found in targets\n", 3182 __func__, saddr); 3183 return; 3184 } 3185 slave->last_rx = jiffies; 3186 slave->target_last_arp_rx[i] = jiffies; 3187 } 3188 3189 static int bond_na_rcv(const struct sk_buff *skb, struct bonding *bond, 3190 struct slave *slave) 3191 { 3192 struct slave *curr_active_slave, *curr_arp_slave; 3193 struct icmp6hdr *hdr = icmp6_hdr(skb); 3194 struct in6_addr *saddr, *daddr; 3195 3196 if (skb->pkt_type == PACKET_OTHERHOST || 3197 skb->pkt_type == PACKET_LOOPBACK || 3198 hdr->icmp6_type != NDISC_NEIGHBOUR_ADVERTISEMENT) 3199 goto out; 3200 3201 saddr = &ipv6_hdr(skb)->saddr; 3202 daddr = &ipv6_hdr(skb)->daddr; 3203 3204 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI6c tip %pI6c\n", 3205 __func__, slave->dev->name, bond_slave_state(slave), 3206 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 3207 saddr, daddr); 3208 3209 curr_active_slave = rcu_dereference(bond->curr_active_slave); 3210 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 3211 3212 /* We 'trust' the received ARP enough to validate it if: 3213 * see bond_arp_rcv(). 3214 */ 3215 if (bond_is_active_slave(slave)) 3216 bond_validate_ns(bond, slave, saddr, daddr); 3217 else if (curr_active_slave && 3218 time_after(slave_last_rx(bond, curr_active_slave), 3219 curr_active_slave->last_link_up)) 3220 bond_validate_ns(bond, slave, saddr, daddr); 3221 else if (curr_arp_slave && 3222 bond_time_in_interval(bond, 3223 dev_trans_start(curr_arp_slave->dev), 1)) 3224 bond_validate_ns(bond, slave, saddr, daddr); 3225 3226 out: 3227 return RX_HANDLER_ANOTHER; 3228 } 3229 #endif 3230 3231 int bond_rcv_validate(const struct sk_buff *skb, struct bonding *bond, 3232 struct slave *slave) 3233 { 3234 #if IS_ENABLED(CONFIG_IPV6) 3235 bool is_ipv6 = skb->protocol == __cpu_to_be16(ETH_P_IPV6); 3236 #endif 3237 bool is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP); 3238 3239 slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n", 3240 __func__, skb->dev->name); 3241 3242 /* Use arp validate logic for both ARP and NS */ 3243 if (!slave_do_arp_validate(bond, slave)) { 3244 if ((slave_do_arp_validate_only(bond) && is_arp) || 3245 #if IS_ENABLED(CONFIG_IPV6) 3246 (slave_do_arp_validate_only(bond) && is_ipv6) || 3247 #endif 3248 !slave_do_arp_validate_only(bond)) 3249 slave->last_rx = jiffies; 3250 return RX_HANDLER_ANOTHER; 3251 } else if (is_arp) { 3252 return bond_arp_rcv(skb, bond, slave); 3253 #if IS_ENABLED(CONFIG_IPV6) 3254 } else if (is_ipv6) { 3255 return bond_na_rcv(skb, bond, slave); 3256 #endif 3257 } else { 3258 return RX_HANDLER_ANOTHER; 3259 } 3260 } 3261 3262 static void bond_send_validate(struct bonding *bond, struct slave *slave) 3263 { 3264 bond_arp_send_all(bond, slave); 3265 #if IS_ENABLED(CONFIG_IPV6) 3266 bond_ns_send_all(bond, slave); 3267 #endif 3268 } 3269 3270 /* function to verify if we're in the arp_interval timeslice, returns true if 3271 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval + 3272 * arp_interval/2) . the arp_interval/2 is needed for really fast networks. 3273 */ 3274 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 3275 int mod) 3276 { 3277 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3278 3279 return time_in_range(jiffies, 3280 last_act - delta_in_ticks, 3281 last_act + mod * delta_in_ticks + delta_in_ticks/2); 3282 } 3283 3284 /* This function is called regularly to monitor each slave's link 3285 * ensuring that traffic is being sent and received when arp monitoring 3286 * is used in load-balancing mode. if the adapter has been dormant, then an 3287 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 3288 * arp monitoring in active backup mode. 3289 */ 3290 static void bond_loadbalance_arp_mon(struct bonding *bond) 3291 { 3292 struct slave *slave, *oldcurrent; 3293 struct list_head *iter; 3294 int do_failover = 0, slave_state_changed = 0; 3295 3296 if (!bond_has_slaves(bond)) 3297 goto re_arm; 3298 3299 rcu_read_lock(); 3300 3301 oldcurrent = rcu_dereference(bond->curr_active_slave); 3302 /* see if any of the previous devices are up now (i.e. they have 3303 * xmt and rcv traffic). the curr_active_slave does not come into 3304 * the picture unless it is null. also, slave->last_link_up is not 3305 * needed here because we send an arp on each slave and give a slave 3306 * as long as it needs to get the tx/rx within the delta. 3307 * TODO: what about up/down delay in arp mode? it wasn't here before 3308 * so it can wait 3309 */ 3310 bond_for_each_slave_rcu(bond, slave, iter) { 3311 unsigned long trans_start = dev_trans_start(slave->dev); 3312 3313 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 3314 3315 if (slave->link != BOND_LINK_UP) { 3316 if (bond_time_in_interval(bond, trans_start, 1) && 3317 bond_time_in_interval(bond, slave->last_rx, 1)) { 3318 3319 bond_propose_link_state(slave, BOND_LINK_UP); 3320 slave_state_changed = 1; 3321 3322 /* primary_slave has no meaning in round-robin 3323 * mode. the window of a slave being up and 3324 * curr_active_slave being null after enslaving 3325 * is closed. 3326 */ 3327 if (!oldcurrent) { 3328 slave_info(bond->dev, slave->dev, "link status definitely up\n"); 3329 do_failover = 1; 3330 } else { 3331 slave_info(bond->dev, slave->dev, "interface is now up\n"); 3332 } 3333 } 3334 } else { 3335 /* slave->link == BOND_LINK_UP */ 3336 3337 /* not all switches will respond to an arp request 3338 * when the source ip is 0, so don't take the link down 3339 * if we don't know our ip yet 3340 */ 3341 if (!bond_time_in_interval(bond, trans_start, bond->params.missed_max) || 3342 !bond_time_in_interval(bond, slave->last_rx, bond->params.missed_max)) { 3343 3344 bond_propose_link_state(slave, BOND_LINK_DOWN); 3345 slave_state_changed = 1; 3346 3347 if (slave->link_failure_count < UINT_MAX) 3348 slave->link_failure_count++; 3349 3350 slave_info(bond->dev, slave->dev, "interface is now down\n"); 3351 3352 if (slave == oldcurrent) 3353 do_failover = 1; 3354 } 3355 } 3356 3357 /* note: if switch is in round-robin mode, all links 3358 * must tx arp to ensure all links rx an arp - otherwise 3359 * links may oscillate or not come up at all; if switch is 3360 * in something like xor mode, there is nothing we can 3361 * do - all replies will be rx'ed on same link causing slaves 3362 * to be unstable during low/no traffic periods 3363 */ 3364 if (bond_slave_is_up(slave)) 3365 bond_send_validate(bond, slave); 3366 } 3367 3368 rcu_read_unlock(); 3369 3370 if (do_failover || slave_state_changed) { 3371 if (!rtnl_trylock()) 3372 goto re_arm; 3373 3374 bond_for_each_slave(bond, slave, iter) { 3375 if (slave->link_new_state != BOND_LINK_NOCHANGE) 3376 slave->link = slave->link_new_state; 3377 } 3378 3379 if (slave_state_changed) { 3380 bond_slave_state_change(bond); 3381 if (BOND_MODE(bond) == BOND_MODE_XOR) 3382 bond_update_slave_arr(bond, NULL); 3383 } 3384 if (do_failover) { 3385 block_netpoll_tx(); 3386 bond_select_active_slave(bond); 3387 unblock_netpoll_tx(); 3388 } 3389 rtnl_unlock(); 3390 } 3391 3392 re_arm: 3393 if (bond->params.arp_interval) 3394 queue_delayed_work(bond->wq, &bond->arp_work, 3395 msecs_to_jiffies(bond->params.arp_interval)); 3396 } 3397 3398 /* Called to inspect slaves for active-backup mode ARP monitor link state 3399 * changes. Sets proposed link state in slaves to specify what action 3400 * should take place for the slave. Returns 0 if no changes are found, >0 3401 * if changes to link states must be committed. 3402 * 3403 * Called with rcu_read_lock held. 3404 */ 3405 static int bond_ab_arp_inspect(struct bonding *bond) 3406 { 3407 unsigned long trans_start, last_rx; 3408 struct list_head *iter; 3409 struct slave *slave; 3410 int commit = 0; 3411 3412 bond_for_each_slave_rcu(bond, slave, iter) { 3413 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 3414 last_rx = slave_last_rx(bond, slave); 3415 3416 if (slave->link != BOND_LINK_UP) { 3417 if (bond_time_in_interval(bond, last_rx, 1)) { 3418 bond_propose_link_state(slave, BOND_LINK_UP); 3419 commit++; 3420 } else if (slave->link == BOND_LINK_BACK) { 3421 bond_propose_link_state(slave, BOND_LINK_FAIL); 3422 commit++; 3423 } 3424 continue; 3425 } 3426 3427 /* Give slaves 2*delta after being enslaved or made 3428 * active. This avoids bouncing, as the last receive 3429 * times need a full ARP monitor cycle to be updated. 3430 */ 3431 if (bond_time_in_interval(bond, slave->last_link_up, 2)) 3432 continue; 3433 3434 /* Backup slave is down if: 3435 * - No current_arp_slave AND 3436 * - more than (missed_max+1)*delta since last receive AND 3437 * - the bond has an IP address 3438 * 3439 * Note: a non-null current_arp_slave indicates 3440 * the curr_active_slave went down and we are 3441 * searching for a new one; under this condition 3442 * we only take the curr_active_slave down - this 3443 * gives each slave a chance to tx/rx traffic 3444 * before being taken out 3445 */ 3446 if (!bond_is_active_slave(slave) && 3447 !rcu_access_pointer(bond->current_arp_slave) && 3448 !bond_time_in_interval(bond, last_rx, bond->params.missed_max + 1)) { 3449 bond_propose_link_state(slave, BOND_LINK_DOWN); 3450 commit++; 3451 } 3452 3453 /* Active slave is down if: 3454 * - more than missed_max*delta since transmitting OR 3455 * - (more than missed_max*delta since receive AND 3456 * the bond has an IP address) 3457 */ 3458 trans_start = dev_trans_start(slave->dev); 3459 if (bond_is_active_slave(slave) && 3460 (!bond_time_in_interval(bond, trans_start, bond->params.missed_max) || 3461 !bond_time_in_interval(bond, last_rx, bond->params.missed_max))) { 3462 bond_propose_link_state(slave, BOND_LINK_DOWN); 3463 commit++; 3464 } 3465 } 3466 3467 return commit; 3468 } 3469 3470 /* Called to commit link state changes noted by inspection step of 3471 * active-backup mode ARP monitor. 3472 * 3473 * Called with RTNL hold. 3474 */ 3475 static void bond_ab_arp_commit(struct bonding *bond) 3476 { 3477 unsigned long trans_start; 3478 struct list_head *iter; 3479 struct slave *slave; 3480 3481 bond_for_each_slave(bond, slave, iter) { 3482 switch (slave->link_new_state) { 3483 case BOND_LINK_NOCHANGE: 3484 continue; 3485 3486 case BOND_LINK_UP: 3487 trans_start = dev_trans_start(slave->dev); 3488 if (rtnl_dereference(bond->curr_active_slave) != slave || 3489 (!rtnl_dereference(bond->curr_active_slave) && 3490 bond_time_in_interval(bond, trans_start, 1))) { 3491 struct slave *current_arp_slave; 3492 3493 current_arp_slave = rtnl_dereference(bond->current_arp_slave); 3494 bond_set_slave_link_state(slave, BOND_LINK_UP, 3495 BOND_SLAVE_NOTIFY_NOW); 3496 if (current_arp_slave) { 3497 bond_set_slave_inactive_flags( 3498 current_arp_slave, 3499 BOND_SLAVE_NOTIFY_NOW); 3500 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3501 } 3502 3503 slave_info(bond->dev, slave->dev, "link status definitely up\n"); 3504 3505 if (!rtnl_dereference(bond->curr_active_slave) || 3506 slave == rtnl_dereference(bond->primary_slave)) 3507 goto do_failover; 3508 3509 } 3510 3511 continue; 3512 3513 case BOND_LINK_DOWN: 3514 if (slave->link_failure_count < UINT_MAX) 3515 slave->link_failure_count++; 3516 3517 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 3518 BOND_SLAVE_NOTIFY_NOW); 3519 bond_set_slave_inactive_flags(slave, 3520 BOND_SLAVE_NOTIFY_NOW); 3521 3522 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n"); 3523 3524 if (slave == rtnl_dereference(bond->curr_active_slave)) { 3525 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3526 goto do_failover; 3527 } 3528 3529 continue; 3530 3531 case BOND_LINK_FAIL: 3532 bond_set_slave_link_state(slave, BOND_LINK_FAIL, 3533 BOND_SLAVE_NOTIFY_NOW); 3534 bond_set_slave_inactive_flags(slave, 3535 BOND_SLAVE_NOTIFY_NOW); 3536 3537 /* A slave has just been enslaved and has become 3538 * the current active slave. 3539 */ 3540 if (rtnl_dereference(bond->curr_active_slave)) 3541 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3542 continue; 3543 3544 default: 3545 slave_err(bond->dev, slave->dev, 3546 "impossible: link_new_state %d on slave\n", 3547 slave->link_new_state); 3548 continue; 3549 } 3550 3551 do_failover: 3552 block_netpoll_tx(); 3553 bond_select_active_slave(bond); 3554 unblock_netpoll_tx(); 3555 } 3556 3557 bond_set_carrier(bond); 3558 } 3559 3560 /* Send ARP probes for active-backup mode ARP monitor. 3561 * 3562 * Called with rcu_read_lock held. 3563 */ 3564 static bool bond_ab_arp_probe(struct bonding *bond) 3565 { 3566 struct slave *slave, *before = NULL, *new_slave = NULL, 3567 *curr_arp_slave = rcu_dereference(bond->current_arp_slave), 3568 *curr_active_slave = rcu_dereference(bond->curr_active_slave); 3569 struct list_head *iter; 3570 bool found = false; 3571 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; 3572 3573 if (curr_arp_slave && curr_active_slave) 3574 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n", 3575 curr_arp_slave->dev->name, 3576 curr_active_slave->dev->name); 3577 3578 if (curr_active_slave) { 3579 bond_send_validate(bond, curr_active_slave); 3580 return should_notify_rtnl; 3581 } 3582 3583 /* if we don't have a curr_active_slave, search for the next available 3584 * backup slave from the current_arp_slave and make it the candidate 3585 * for becoming the curr_active_slave 3586 */ 3587 3588 if (!curr_arp_slave) { 3589 curr_arp_slave = bond_first_slave_rcu(bond); 3590 if (!curr_arp_slave) 3591 return should_notify_rtnl; 3592 } 3593 3594 bond_for_each_slave_rcu(bond, slave, iter) { 3595 if (!found && !before && bond_slave_is_up(slave)) 3596 before = slave; 3597 3598 if (found && !new_slave && bond_slave_is_up(slave)) 3599 new_slave = slave; 3600 /* if the link state is up at this point, we 3601 * mark it down - this can happen if we have 3602 * simultaneous link failures and 3603 * reselect_active_interface doesn't make this 3604 * one the current slave so it is still marked 3605 * up when it is actually down 3606 */ 3607 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 3608 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 3609 BOND_SLAVE_NOTIFY_LATER); 3610 if (slave->link_failure_count < UINT_MAX) 3611 slave->link_failure_count++; 3612 3613 bond_set_slave_inactive_flags(slave, 3614 BOND_SLAVE_NOTIFY_LATER); 3615 3616 slave_info(bond->dev, slave->dev, "backup interface is now down\n"); 3617 } 3618 if (slave == curr_arp_slave) 3619 found = true; 3620 } 3621 3622 if (!new_slave && before) 3623 new_slave = before; 3624 3625 if (!new_slave) 3626 goto check_state; 3627 3628 bond_set_slave_link_state(new_slave, BOND_LINK_BACK, 3629 BOND_SLAVE_NOTIFY_LATER); 3630 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER); 3631 bond_send_validate(bond, new_slave); 3632 new_slave->last_link_up = jiffies; 3633 rcu_assign_pointer(bond->current_arp_slave, new_slave); 3634 3635 check_state: 3636 bond_for_each_slave_rcu(bond, slave, iter) { 3637 if (slave->should_notify || slave->should_notify_link) { 3638 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; 3639 break; 3640 } 3641 } 3642 return should_notify_rtnl; 3643 } 3644 3645 static void bond_activebackup_arp_mon(struct bonding *bond) 3646 { 3647 bool should_notify_peers = false; 3648 bool should_notify_rtnl = false; 3649 int delta_in_ticks; 3650 3651 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3652 3653 if (!bond_has_slaves(bond)) 3654 goto re_arm; 3655 3656 rcu_read_lock(); 3657 3658 should_notify_peers = bond_should_notify_peers(bond); 3659 3660 if (bond_ab_arp_inspect(bond)) { 3661 rcu_read_unlock(); 3662 3663 /* Race avoidance with bond_close flush of workqueue */ 3664 if (!rtnl_trylock()) { 3665 delta_in_ticks = 1; 3666 should_notify_peers = false; 3667 goto re_arm; 3668 } 3669 3670 bond_ab_arp_commit(bond); 3671 3672 rtnl_unlock(); 3673 rcu_read_lock(); 3674 } 3675 3676 should_notify_rtnl = bond_ab_arp_probe(bond); 3677 rcu_read_unlock(); 3678 3679 re_arm: 3680 if (bond->params.arp_interval) 3681 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 3682 3683 if (should_notify_peers || should_notify_rtnl) { 3684 if (!rtnl_trylock()) 3685 return; 3686 3687 if (should_notify_peers) 3688 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 3689 bond->dev); 3690 if (should_notify_rtnl) { 3691 bond_slave_state_notify(bond); 3692 bond_slave_link_notify(bond); 3693 } 3694 3695 rtnl_unlock(); 3696 } 3697 } 3698 3699 static void bond_arp_monitor(struct work_struct *work) 3700 { 3701 struct bonding *bond = container_of(work, struct bonding, 3702 arp_work.work); 3703 3704 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3705 bond_activebackup_arp_mon(bond); 3706 else 3707 bond_loadbalance_arp_mon(bond); 3708 } 3709 3710 /*-------------------------- netdev event handling --------------------------*/ 3711 3712 /* Change device name */ 3713 static int bond_event_changename(struct bonding *bond) 3714 { 3715 bond_remove_proc_entry(bond); 3716 bond_create_proc_entry(bond); 3717 3718 bond_debug_reregister(bond); 3719 3720 return NOTIFY_DONE; 3721 } 3722 3723 static int bond_master_netdev_event(unsigned long event, 3724 struct net_device *bond_dev) 3725 { 3726 struct bonding *event_bond = netdev_priv(bond_dev); 3727 3728 netdev_dbg(bond_dev, "%s called\n", __func__); 3729 3730 switch (event) { 3731 case NETDEV_CHANGENAME: 3732 return bond_event_changename(event_bond); 3733 case NETDEV_UNREGISTER: 3734 bond_remove_proc_entry(event_bond); 3735 #ifdef CONFIG_XFRM_OFFLOAD 3736 xfrm_dev_state_flush(dev_net(bond_dev), bond_dev, true); 3737 #endif /* CONFIG_XFRM_OFFLOAD */ 3738 break; 3739 case NETDEV_REGISTER: 3740 bond_create_proc_entry(event_bond); 3741 break; 3742 default: 3743 break; 3744 } 3745 3746 return NOTIFY_DONE; 3747 } 3748 3749 static int bond_slave_netdev_event(unsigned long event, 3750 struct net_device *slave_dev) 3751 { 3752 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary; 3753 struct bonding *bond; 3754 struct net_device *bond_dev; 3755 3756 /* A netdev event can be generated while enslaving a device 3757 * before netdev_rx_handler_register is called in which case 3758 * slave will be NULL 3759 */ 3760 if (!slave) { 3761 netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__); 3762 return NOTIFY_DONE; 3763 } 3764 3765 bond_dev = slave->bond->dev; 3766 bond = slave->bond; 3767 primary = rtnl_dereference(bond->primary_slave); 3768 3769 slave_dbg(bond_dev, slave_dev, "%s called\n", __func__); 3770 3771 switch (event) { 3772 case NETDEV_UNREGISTER: 3773 if (bond_dev->type != ARPHRD_ETHER) 3774 bond_release_and_destroy(bond_dev, slave_dev); 3775 else 3776 __bond_release_one(bond_dev, slave_dev, false, true); 3777 break; 3778 case NETDEV_UP: 3779 case NETDEV_CHANGE: 3780 /* For 802.3ad mode only: 3781 * Getting invalid Speed/Duplex values here will put slave 3782 * in weird state. Mark it as link-fail if the link was 3783 * previously up or link-down if it hasn't yet come up, and 3784 * let link-monitoring (miimon) set it right when correct 3785 * speeds/duplex are available. 3786 */ 3787 if (bond_update_speed_duplex(slave) && 3788 BOND_MODE(bond) == BOND_MODE_8023AD) { 3789 if (slave->last_link_up) 3790 slave->link = BOND_LINK_FAIL; 3791 else 3792 slave->link = BOND_LINK_DOWN; 3793 } 3794 3795 if (BOND_MODE(bond) == BOND_MODE_8023AD) 3796 bond_3ad_adapter_speed_duplex_changed(slave); 3797 fallthrough; 3798 case NETDEV_DOWN: 3799 /* Refresh slave-array if applicable! 3800 * If the setup does not use miimon or arpmon (mode-specific!), 3801 * then these events will not cause the slave-array to be 3802 * refreshed. This will cause xmit to use a slave that is not 3803 * usable. Avoid such situation by refeshing the array at these 3804 * events. If these (miimon/arpmon) parameters are configured 3805 * then array gets refreshed twice and that should be fine! 3806 */ 3807 if (bond_mode_can_use_xmit_hash(bond)) 3808 bond_update_slave_arr(bond, NULL); 3809 break; 3810 case NETDEV_CHANGEMTU: 3811 /* TODO: Should slaves be allowed to 3812 * independently alter their MTU? For 3813 * an active-backup bond, slaves need 3814 * not be the same type of device, so 3815 * MTUs may vary. For other modes, 3816 * slaves arguably should have the 3817 * same MTUs. To do this, we'd need to 3818 * take over the slave's change_mtu 3819 * function for the duration of their 3820 * servitude. 3821 */ 3822 break; 3823 case NETDEV_CHANGENAME: 3824 /* we don't care if we don't have primary set */ 3825 if (!bond_uses_primary(bond) || 3826 !bond->params.primary[0]) 3827 break; 3828 3829 if (slave == primary) { 3830 /* slave's name changed - he's no longer primary */ 3831 RCU_INIT_POINTER(bond->primary_slave, NULL); 3832 } else if (!strcmp(slave_dev->name, bond->params.primary)) { 3833 /* we have a new primary slave */ 3834 rcu_assign_pointer(bond->primary_slave, slave); 3835 } else { /* we didn't change primary - exit */ 3836 break; 3837 } 3838 3839 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n", 3840 primary ? slave_dev->name : "none"); 3841 3842 block_netpoll_tx(); 3843 bond_select_active_slave(bond); 3844 unblock_netpoll_tx(); 3845 break; 3846 case NETDEV_FEAT_CHANGE: 3847 bond_compute_features(bond); 3848 break; 3849 case NETDEV_RESEND_IGMP: 3850 /* Propagate to master device */ 3851 call_netdevice_notifiers(event, slave->bond->dev); 3852 break; 3853 default: 3854 break; 3855 } 3856 3857 return NOTIFY_DONE; 3858 } 3859 3860 /* bond_netdev_event: handle netdev notifier chain events. 3861 * 3862 * This function receives events for the netdev chain. The caller (an 3863 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 3864 * locks for us to safely manipulate the slave devices (RTNL lock, 3865 * dev_probe_lock). 3866 */ 3867 static int bond_netdev_event(struct notifier_block *this, 3868 unsigned long event, void *ptr) 3869 { 3870 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 3871 3872 netdev_dbg(event_dev, "%s received %s\n", 3873 __func__, netdev_cmd_to_name(event)); 3874 3875 if (!(event_dev->priv_flags & IFF_BONDING)) 3876 return NOTIFY_DONE; 3877 3878 if (event_dev->flags & IFF_MASTER) { 3879 int ret; 3880 3881 ret = bond_master_netdev_event(event, event_dev); 3882 if (ret != NOTIFY_DONE) 3883 return ret; 3884 } 3885 3886 if (event_dev->flags & IFF_SLAVE) 3887 return bond_slave_netdev_event(event, event_dev); 3888 3889 return NOTIFY_DONE; 3890 } 3891 3892 static struct notifier_block bond_netdev_notifier = { 3893 .notifier_call = bond_netdev_event, 3894 }; 3895 3896 /*---------------------------- Hashing Policies -----------------------------*/ 3897 3898 /* Helper to access data in a packet, with or without a backing skb. 3899 * If skb is given the data is linearized if necessary via pskb_may_pull. 3900 */ 3901 static inline const void *bond_pull_data(struct sk_buff *skb, 3902 const void *data, int hlen, int n) 3903 { 3904 if (likely(n <= hlen)) 3905 return data; 3906 else if (skb && likely(pskb_may_pull(skb, n))) 3907 return skb->head; 3908 3909 return NULL; 3910 } 3911 3912 /* L2 hash helper */ 3913 static inline u32 bond_eth_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen) 3914 { 3915 struct ethhdr *ep; 3916 3917 data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr)); 3918 if (!data) 3919 return 0; 3920 3921 ep = (struct ethhdr *)(data + mhoff); 3922 return ep->h_dest[5] ^ ep->h_source[5] ^ be16_to_cpu(ep->h_proto); 3923 } 3924 3925 static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk, const void *data, 3926 int hlen, __be16 l2_proto, int *nhoff, int *ip_proto, bool l34) 3927 { 3928 const struct ipv6hdr *iph6; 3929 const struct iphdr *iph; 3930 3931 if (l2_proto == htons(ETH_P_IP)) { 3932 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph)); 3933 if (!data) 3934 return false; 3935 3936 iph = (const struct iphdr *)(data + *nhoff); 3937 iph_to_flow_copy_v4addrs(fk, iph); 3938 *nhoff += iph->ihl << 2; 3939 if (!ip_is_fragment(iph)) 3940 *ip_proto = iph->protocol; 3941 } else if (l2_proto == htons(ETH_P_IPV6)) { 3942 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph6)); 3943 if (!data) 3944 return false; 3945 3946 iph6 = (const struct ipv6hdr *)(data + *nhoff); 3947 iph_to_flow_copy_v6addrs(fk, iph6); 3948 *nhoff += sizeof(*iph6); 3949 *ip_proto = iph6->nexthdr; 3950 } else { 3951 return false; 3952 } 3953 3954 if (l34 && *ip_proto >= 0) 3955 fk->ports.ports = __skb_flow_get_ports(skb, *nhoff, *ip_proto, data, hlen); 3956 3957 return true; 3958 } 3959 3960 static u32 bond_vlan_srcmac_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen) 3961 { 3962 u32 srcmac_vendor = 0, srcmac_dev = 0; 3963 struct ethhdr *mac_hdr; 3964 u16 vlan = 0; 3965 int i; 3966 3967 data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr)); 3968 if (!data) 3969 return 0; 3970 mac_hdr = (struct ethhdr *)(data + mhoff); 3971 3972 for (i = 0; i < 3; i++) 3973 srcmac_vendor = (srcmac_vendor << 8) | mac_hdr->h_source[i]; 3974 3975 for (i = 3; i < ETH_ALEN; i++) 3976 srcmac_dev = (srcmac_dev << 8) | mac_hdr->h_source[i]; 3977 3978 if (skb && skb_vlan_tag_present(skb)) 3979 vlan = skb_vlan_tag_get(skb); 3980 3981 return vlan ^ srcmac_vendor ^ srcmac_dev; 3982 } 3983 3984 /* Extract the appropriate headers based on bond's xmit policy */ 3985 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, const void *data, 3986 __be16 l2_proto, int nhoff, int hlen, struct flow_keys *fk) 3987 { 3988 bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34; 3989 int ip_proto = -1; 3990 3991 switch (bond->params.xmit_policy) { 3992 case BOND_XMIT_POLICY_ENCAP23: 3993 case BOND_XMIT_POLICY_ENCAP34: 3994 memset(fk, 0, sizeof(*fk)); 3995 return __skb_flow_dissect(NULL, skb, &flow_keys_bonding, 3996 fk, data, l2_proto, nhoff, hlen, 0); 3997 default: 3998 break; 3999 } 4000 4001 fk->ports.ports = 0; 4002 memset(&fk->icmp, 0, sizeof(fk->icmp)); 4003 if (!bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34)) 4004 return false; 4005 4006 /* ICMP error packets contains at least 8 bytes of the header 4007 * of the packet which generated the error. Use this information 4008 * to correlate ICMP error packets within the same flow which 4009 * generated the error. 4010 */ 4011 if (ip_proto == IPPROTO_ICMP || ip_proto == IPPROTO_ICMPV6) { 4012 skb_flow_get_icmp_tci(skb, &fk->icmp, data, nhoff, hlen); 4013 if (ip_proto == IPPROTO_ICMP) { 4014 if (!icmp_is_err(fk->icmp.type)) 4015 return true; 4016 4017 nhoff += sizeof(struct icmphdr); 4018 } else if (ip_proto == IPPROTO_ICMPV6) { 4019 if (!icmpv6_is_err(fk->icmp.type)) 4020 return true; 4021 4022 nhoff += sizeof(struct icmp6hdr); 4023 } 4024 return bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34); 4025 } 4026 4027 return true; 4028 } 4029 4030 static u32 bond_ip_hash(u32 hash, struct flow_keys *flow, int xmit_policy) 4031 { 4032 hash ^= (__force u32)flow_get_u32_dst(flow) ^ 4033 (__force u32)flow_get_u32_src(flow); 4034 hash ^= (hash >> 16); 4035 hash ^= (hash >> 8); 4036 4037 /* discard lowest hash bit to deal with the common even ports pattern */ 4038 if (xmit_policy == BOND_XMIT_POLICY_LAYER34 || 4039 xmit_policy == BOND_XMIT_POLICY_ENCAP34) 4040 return hash >> 1; 4041 4042 return hash; 4043 } 4044 4045 /* Generate hash based on xmit policy. If @skb is given it is used to linearize 4046 * the data as required, but this function can be used without it if the data is 4047 * known to be linear (e.g. with xdp_buff). 4048 */ 4049 static u32 __bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, const void *data, 4050 __be16 l2_proto, int mhoff, int nhoff, int hlen) 4051 { 4052 struct flow_keys flow; 4053 u32 hash; 4054 4055 if (bond->params.xmit_policy == BOND_XMIT_POLICY_VLAN_SRCMAC) 4056 return bond_vlan_srcmac_hash(skb, data, mhoff, hlen); 4057 4058 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 || 4059 !bond_flow_dissect(bond, skb, data, l2_proto, nhoff, hlen, &flow)) 4060 return bond_eth_hash(skb, data, mhoff, hlen); 4061 4062 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 || 4063 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) { 4064 hash = bond_eth_hash(skb, data, mhoff, hlen); 4065 } else { 4066 if (flow.icmp.id) 4067 memcpy(&hash, &flow.icmp, sizeof(hash)); 4068 else 4069 memcpy(&hash, &flow.ports.ports, sizeof(hash)); 4070 } 4071 4072 return bond_ip_hash(hash, &flow, bond->params.xmit_policy); 4073 } 4074 4075 /** 4076 * bond_xmit_hash - generate a hash value based on the xmit policy 4077 * @bond: bonding device 4078 * @skb: buffer to use for headers 4079 * 4080 * This function will extract the necessary headers from the skb buffer and use 4081 * them to generate a hash based on the xmit_policy set in the bonding device 4082 */ 4083 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb) 4084 { 4085 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 && 4086 skb->l4_hash) 4087 return skb->hash; 4088 4089 return __bond_xmit_hash(bond, skb, skb->data, skb->protocol, 4090 skb_mac_offset(skb), skb_network_offset(skb), 4091 skb_headlen(skb)); 4092 } 4093 4094 /** 4095 * bond_xmit_hash_xdp - generate a hash value based on the xmit policy 4096 * @bond: bonding device 4097 * @xdp: buffer to use for headers 4098 * 4099 * The XDP variant of bond_xmit_hash. 4100 */ 4101 static u32 bond_xmit_hash_xdp(struct bonding *bond, struct xdp_buff *xdp) 4102 { 4103 struct ethhdr *eth; 4104 4105 if (xdp->data + sizeof(struct ethhdr) > xdp->data_end) 4106 return 0; 4107 4108 eth = (struct ethhdr *)xdp->data; 4109 4110 return __bond_xmit_hash(bond, NULL, xdp->data, eth->h_proto, 0, 4111 sizeof(struct ethhdr), xdp->data_end - xdp->data); 4112 } 4113 4114 /*-------------------------- Device entry points ----------------------------*/ 4115 4116 void bond_work_init_all(struct bonding *bond) 4117 { 4118 INIT_DELAYED_WORK(&bond->mcast_work, 4119 bond_resend_igmp_join_requests_delayed); 4120 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 4121 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 4122 INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor); 4123 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 4124 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler); 4125 } 4126 4127 static void bond_work_cancel_all(struct bonding *bond) 4128 { 4129 cancel_delayed_work_sync(&bond->mii_work); 4130 cancel_delayed_work_sync(&bond->arp_work); 4131 cancel_delayed_work_sync(&bond->alb_work); 4132 cancel_delayed_work_sync(&bond->ad_work); 4133 cancel_delayed_work_sync(&bond->mcast_work); 4134 cancel_delayed_work_sync(&bond->slave_arr_work); 4135 } 4136 4137 static int bond_open(struct net_device *bond_dev) 4138 { 4139 struct bonding *bond = netdev_priv(bond_dev); 4140 struct list_head *iter; 4141 struct slave *slave; 4142 4143 /* reset slave->backup and slave->inactive */ 4144 if (bond_has_slaves(bond)) { 4145 bond_for_each_slave(bond, slave, iter) { 4146 if (bond_uses_primary(bond) && 4147 slave != rcu_access_pointer(bond->curr_active_slave)) { 4148 bond_set_slave_inactive_flags(slave, 4149 BOND_SLAVE_NOTIFY_NOW); 4150 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) { 4151 bond_set_slave_active_flags(slave, 4152 BOND_SLAVE_NOTIFY_NOW); 4153 } 4154 } 4155 } 4156 4157 if (bond_is_lb(bond)) { 4158 /* bond_alb_initialize must be called before the timer 4159 * is started. 4160 */ 4161 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB))) 4162 return -ENOMEM; 4163 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB) 4164 queue_delayed_work(bond->wq, &bond->alb_work, 0); 4165 } 4166 4167 if (bond->params.miimon) /* link check interval, in milliseconds. */ 4168 queue_delayed_work(bond->wq, &bond->mii_work, 0); 4169 4170 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 4171 queue_delayed_work(bond->wq, &bond->arp_work, 0); 4172 bond->recv_probe = bond_rcv_validate; 4173 } 4174 4175 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 4176 queue_delayed_work(bond->wq, &bond->ad_work, 0); 4177 /* register to receive LACPDUs */ 4178 bond->recv_probe = bond_3ad_lacpdu_recv; 4179 bond_3ad_initiate_agg_selection(bond, 1); 4180 } 4181 4182 if (bond_mode_can_use_xmit_hash(bond)) 4183 bond_update_slave_arr(bond, NULL); 4184 4185 return 0; 4186 } 4187 4188 static int bond_close(struct net_device *bond_dev) 4189 { 4190 struct bonding *bond = netdev_priv(bond_dev); 4191 4192 bond_work_cancel_all(bond); 4193 bond->send_peer_notif = 0; 4194 if (bond_is_lb(bond)) 4195 bond_alb_deinitialize(bond); 4196 bond->recv_probe = NULL; 4197 4198 return 0; 4199 } 4200 4201 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but 4202 * that some drivers can provide 32bit values only. 4203 */ 4204 static void bond_fold_stats(struct rtnl_link_stats64 *_res, 4205 const struct rtnl_link_stats64 *_new, 4206 const struct rtnl_link_stats64 *_old) 4207 { 4208 const u64 *new = (const u64 *)_new; 4209 const u64 *old = (const u64 *)_old; 4210 u64 *res = (u64 *)_res; 4211 int i; 4212 4213 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) { 4214 u64 nv = new[i]; 4215 u64 ov = old[i]; 4216 s64 delta = nv - ov; 4217 4218 /* detects if this particular field is 32bit only */ 4219 if (((nv | ov) >> 32) == 0) 4220 delta = (s64)(s32)((u32)nv - (u32)ov); 4221 4222 /* filter anomalies, some drivers reset their stats 4223 * at down/up events. 4224 */ 4225 if (delta > 0) 4226 res[i] += delta; 4227 } 4228 } 4229 4230 #ifdef CONFIG_LOCKDEP 4231 static int bond_get_lowest_level_rcu(struct net_device *dev) 4232 { 4233 struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; 4234 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; 4235 int cur = 0, max = 0; 4236 4237 now = dev; 4238 iter = &dev->adj_list.lower; 4239 4240 while (1) { 4241 next = NULL; 4242 while (1) { 4243 ldev = netdev_next_lower_dev_rcu(now, &iter); 4244 if (!ldev) 4245 break; 4246 4247 next = ldev; 4248 niter = &ldev->adj_list.lower; 4249 dev_stack[cur] = now; 4250 iter_stack[cur++] = iter; 4251 if (max <= cur) 4252 max = cur; 4253 break; 4254 } 4255 4256 if (!next) { 4257 if (!cur) 4258 return max; 4259 next = dev_stack[--cur]; 4260 niter = iter_stack[cur]; 4261 } 4262 4263 now = next; 4264 iter = niter; 4265 } 4266 4267 return max; 4268 } 4269 #endif 4270 4271 static void bond_get_stats(struct net_device *bond_dev, 4272 struct rtnl_link_stats64 *stats) 4273 { 4274 struct bonding *bond = netdev_priv(bond_dev); 4275 struct rtnl_link_stats64 temp; 4276 struct list_head *iter; 4277 struct slave *slave; 4278 int nest_level = 0; 4279 4280 4281 rcu_read_lock(); 4282 #ifdef CONFIG_LOCKDEP 4283 nest_level = bond_get_lowest_level_rcu(bond_dev); 4284 #endif 4285 4286 spin_lock_nested(&bond->stats_lock, nest_level); 4287 memcpy(stats, &bond->bond_stats, sizeof(*stats)); 4288 4289 bond_for_each_slave_rcu(bond, slave, iter) { 4290 const struct rtnl_link_stats64 *new = 4291 dev_get_stats(slave->dev, &temp); 4292 4293 bond_fold_stats(stats, new, &slave->slave_stats); 4294 4295 /* save off the slave stats for the next run */ 4296 memcpy(&slave->slave_stats, new, sizeof(*new)); 4297 } 4298 4299 memcpy(&bond->bond_stats, stats, sizeof(*stats)); 4300 spin_unlock(&bond->stats_lock); 4301 rcu_read_unlock(); 4302 } 4303 4304 static int bond_eth_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 4305 { 4306 struct bonding *bond = netdev_priv(bond_dev); 4307 struct mii_ioctl_data *mii = NULL; 4308 const struct net_device_ops *ops; 4309 struct net_device *real_dev; 4310 struct hwtstamp_config cfg; 4311 struct ifreq ifrr; 4312 int res = 0; 4313 4314 netdev_dbg(bond_dev, "bond_eth_ioctl: cmd=%d\n", cmd); 4315 4316 switch (cmd) { 4317 case SIOCGMIIPHY: 4318 mii = if_mii(ifr); 4319 if (!mii) 4320 return -EINVAL; 4321 4322 mii->phy_id = 0; 4323 fallthrough; 4324 case SIOCGMIIREG: 4325 /* We do this again just in case we were called by SIOCGMIIREG 4326 * instead of SIOCGMIIPHY. 4327 */ 4328 mii = if_mii(ifr); 4329 if (!mii) 4330 return -EINVAL; 4331 4332 if (mii->reg_num == 1) { 4333 mii->val_out = 0; 4334 if (netif_carrier_ok(bond->dev)) 4335 mii->val_out = BMSR_LSTATUS; 4336 } 4337 4338 break; 4339 case SIOCSHWTSTAMP: 4340 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) 4341 return -EFAULT; 4342 4343 if (!(cfg.flags & HWTSTAMP_FLAG_BONDED_PHC_INDEX)) 4344 return -EOPNOTSUPP; 4345 4346 fallthrough; 4347 case SIOCGHWTSTAMP: 4348 real_dev = bond_option_active_slave_get_rcu(bond); 4349 if (!real_dev) 4350 return -EOPNOTSUPP; 4351 4352 strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ); 4353 ifrr.ifr_ifru = ifr->ifr_ifru; 4354 4355 ops = real_dev->netdev_ops; 4356 if (netif_device_present(real_dev) && ops->ndo_eth_ioctl) { 4357 res = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd); 4358 if (res) 4359 return res; 4360 4361 ifr->ifr_ifru = ifrr.ifr_ifru; 4362 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) 4363 return -EFAULT; 4364 4365 /* Set the BOND_PHC_INDEX flag to notify user space */ 4366 cfg.flags |= HWTSTAMP_FLAG_BONDED_PHC_INDEX; 4367 4368 return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? 4369 -EFAULT : 0; 4370 } 4371 fallthrough; 4372 default: 4373 res = -EOPNOTSUPP; 4374 } 4375 4376 return res; 4377 } 4378 4379 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 4380 { 4381 struct bonding *bond = netdev_priv(bond_dev); 4382 struct net_device *slave_dev = NULL; 4383 struct ifbond k_binfo; 4384 struct ifbond __user *u_binfo = NULL; 4385 struct ifslave k_sinfo; 4386 struct ifslave __user *u_sinfo = NULL; 4387 struct bond_opt_value newval; 4388 struct net *net; 4389 int res = 0; 4390 4391 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd); 4392 4393 switch (cmd) { 4394 case SIOCBONDINFOQUERY: 4395 u_binfo = (struct ifbond __user *)ifr->ifr_data; 4396 4397 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 4398 return -EFAULT; 4399 4400 bond_info_query(bond_dev, &k_binfo); 4401 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 4402 return -EFAULT; 4403 4404 return 0; 4405 case SIOCBONDSLAVEINFOQUERY: 4406 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 4407 4408 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 4409 return -EFAULT; 4410 4411 res = bond_slave_info_query(bond_dev, &k_sinfo); 4412 if (res == 0 && 4413 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 4414 return -EFAULT; 4415 4416 return res; 4417 default: 4418 break; 4419 } 4420 4421 net = dev_net(bond_dev); 4422 4423 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 4424 return -EPERM; 4425 4426 slave_dev = __dev_get_by_name(net, ifr->ifr_slave); 4427 4428 slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev); 4429 4430 if (!slave_dev) 4431 return -ENODEV; 4432 4433 switch (cmd) { 4434 case SIOCBONDENSLAVE: 4435 res = bond_enslave(bond_dev, slave_dev, NULL); 4436 break; 4437 case SIOCBONDRELEASE: 4438 res = bond_release(bond_dev, slave_dev); 4439 break; 4440 case SIOCBONDSETHWADDR: 4441 res = bond_set_dev_addr(bond_dev, slave_dev); 4442 break; 4443 case SIOCBONDCHANGEACTIVE: 4444 bond_opt_initstr(&newval, slave_dev->name); 4445 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE, 4446 &newval); 4447 break; 4448 default: 4449 res = -EOPNOTSUPP; 4450 } 4451 4452 return res; 4453 } 4454 4455 static int bond_siocdevprivate(struct net_device *bond_dev, struct ifreq *ifr, 4456 void __user *data, int cmd) 4457 { 4458 struct ifreq ifrdata = { .ifr_data = data }; 4459 4460 switch (cmd) { 4461 case BOND_INFO_QUERY_OLD: 4462 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDINFOQUERY); 4463 case BOND_SLAVE_INFO_QUERY_OLD: 4464 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDSLAVEINFOQUERY); 4465 case BOND_ENSLAVE_OLD: 4466 return bond_do_ioctl(bond_dev, ifr, SIOCBONDENSLAVE); 4467 case BOND_RELEASE_OLD: 4468 return bond_do_ioctl(bond_dev, ifr, SIOCBONDRELEASE); 4469 case BOND_SETHWADDR_OLD: 4470 return bond_do_ioctl(bond_dev, ifr, SIOCBONDSETHWADDR); 4471 case BOND_CHANGE_ACTIVE_OLD: 4472 return bond_do_ioctl(bond_dev, ifr, SIOCBONDCHANGEACTIVE); 4473 } 4474 4475 return -EOPNOTSUPP; 4476 } 4477 4478 static void bond_change_rx_flags(struct net_device *bond_dev, int change) 4479 { 4480 struct bonding *bond = netdev_priv(bond_dev); 4481 4482 if (change & IFF_PROMISC) 4483 bond_set_promiscuity(bond, 4484 bond_dev->flags & IFF_PROMISC ? 1 : -1); 4485 4486 if (change & IFF_ALLMULTI) 4487 bond_set_allmulti(bond, 4488 bond_dev->flags & IFF_ALLMULTI ? 1 : -1); 4489 } 4490 4491 static void bond_set_rx_mode(struct net_device *bond_dev) 4492 { 4493 struct bonding *bond = netdev_priv(bond_dev); 4494 struct list_head *iter; 4495 struct slave *slave; 4496 4497 rcu_read_lock(); 4498 if (bond_uses_primary(bond)) { 4499 slave = rcu_dereference(bond->curr_active_slave); 4500 if (slave) { 4501 dev_uc_sync(slave->dev, bond_dev); 4502 dev_mc_sync(slave->dev, bond_dev); 4503 } 4504 } else { 4505 bond_for_each_slave_rcu(bond, slave, iter) { 4506 dev_uc_sync_multiple(slave->dev, bond_dev); 4507 dev_mc_sync_multiple(slave->dev, bond_dev); 4508 } 4509 } 4510 rcu_read_unlock(); 4511 } 4512 4513 static int bond_neigh_init(struct neighbour *n) 4514 { 4515 struct bonding *bond = netdev_priv(n->dev); 4516 const struct net_device_ops *slave_ops; 4517 struct neigh_parms parms; 4518 struct slave *slave; 4519 int ret = 0; 4520 4521 rcu_read_lock(); 4522 slave = bond_first_slave_rcu(bond); 4523 if (!slave) 4524 goto out; 4525 slave_ops = slave->dev->netdev_ops; 4526 if (!slave_ops->ndo_neigh_setup) 4527 goto out; 4528 4529 /* TODO: find another way [1] to implement this. 4530 * Passing a zeroed structure is fragile, 4531 * but at least we do not pass garbage. 4532 * 4533 * [1] One way would be that ndo_neigh_setup() never touch 4534 * struct neigh_parms, but propagate the new neigh_setup() 4535 * back to ___neigh_create() / neigh_parms_alloc() 4536 */ 4537 memset(&parms, 0, sizeof(parms)); 4538 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); 4539 4540 if (ret) 4541 goto out; 4542 4543 if (parms.neigh_setup) 4544 ret = parms.neigh_setup(n); 4545 out: 4546 rcu_read_unlock(); 4547 return ret; 4548 } 4549 4550 /* The bonding ndo_neigh_setup is called at init time beofre any 4551 * slave exists. So we must declare proxy setup function which will 4552 * be used at run time to resolve the actual slave neigh param setup. 4553 * 4554 * It's also called by master devices (such as vlans) to setup their 4555 * underlying devices. In that case - do nothing, we're already set up from 4556 * our init. 4557 */ 4558 static int bond_neigh_setup(struct net_device *dev, 4559 struct neigh_parms *parms) 4560 { 4561 /* modify only our neigh_parms */ 4562 if (parms->dev == dev) 4563 parms->neigh_setup = bond_neigh_init; 4564 4565 return 0; 4566 } 4567 4568 /* Change the MTU of all of a master's slaves to match the master */ 4569 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 4570 { 4571 struct bonding *bond = netdev_priv(bond_dev); 4572 struct slave *slave, *rollback_slave; 4573 struct list_head *iter; 4574 int res = 0; 4575 4576 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu); 4577 4578 bond_for_each_slave(bond, slave, iter) { 4579 slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n", 4580 slave, slave->dev->netdev_ops->ndo_change_mtu); 4581 4582 res = dev_set_mtu(slave->dev, new_mtu); 4583 4584 if (res) { 4585 /* If we failed to set the slave's mtu to the new value 4586 * we must abort the operation even in ACTIVE_BACKUP 4587 * mode, because if we allow the backup slaves to have 4588 * different mtu values than the active slave we'll 4589 * need to change their mtu when doing a failover. That 4590 * means changing their mtu from timer context, which 4591 * is probably not a good idea. 4592 */ 4593 slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n", 4594 res, new_mtu); 4595 goto unwind; 4596 } 4597 } 4598 4599 bond_dev->mtu = new_mtu; 4600 4601 return 0; 4602 4603 unwind: 4604 /* unwind from head to the slave that failed */ 4605 bond_for_each_slave(bond, rollback_slave, iter) { 4606 int tmp_res; 4607 4608 if (rollback_slave == slave) 4609 break; 4610 4611 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu); 4612 if (tmp_res) 4613 slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n", 4614 tmp_res); 4615 } 4616 4617 return res; 4618 } 4619 4620 /* Change HW address 4621 * 4622 * Note that many devices must be down to change the HW address, and 4623 * downing the master releases all slaves. We can make bonds full of 4624 * bonding devices to test this, however. 4625 */ 4626 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 4627 { 4628 struct bonding *bond = netdev_priv(bond_dev); 4629 struct slave *slave, *rollback_slave; 4630 struct sockaddr_storage *ss = addr, tmp_ss; 4631 struct list_head *iter; 4632 int res = 0; 4633 4634 if (BOND_MODE(bond) == BOND_MODE_ALB) 4635 return bond_alb_set_mac_address(bond_dev, addr); 4636 4637 4638 netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond); 4639 4640 /* If fail_over_mac is enabled, do nothing and return success. 4641 * Returning an error causes ifenslave to fail. 4642 */ 4643 if (bond->params.fail_over_mac && 4644 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 4645 return 0; 4646 4647 if (!is_valid_ether_addr(ss->__data)) 4648 return -EADDRNOTAVAIL; 4649 4650 bond_for_each_slave(bond, slave, iter) { 4651 slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n", 4652 __func__, slave); 4653 res = dev_set_mac_address(slave->dev, addr, NULL); 4654 if (res) { 4655 /* TODO: consider downing the slave 4656 * and retry ? 4657 * User should expect communications 4658 * breakage anyway until ARP finish 4659 * updating, so... 4660 */ 4661 slave_dbg(bond_dev, slave->dev, "%s: err %d\n", 4662 __func__, res); 4663 goto unwind; 4664 } 4665 } 4666 4667 /* success */ 4668 dev_addr_set(bond_dev, ss->__data); 4669 return 0; 4670 4671 unwind: 4672 memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 4673 tmp_ss.ss_family = bond_dev->type; 4674 4675 /* unwind from head to the slave that failed */ 4676 bond_for_each_slave(bond, rollback_slave, iter) { 4677 int tmp_res; 4678 4679 if (rollback_slave == slave) 4680 break; 4681 4682 tmp_res = dev_set_mac_address(rollback_slave->dev, 4683 (struct sockaddr *)&tmp_ss, NULL); 4684 if (tmp_res) { 4685 slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n", 4686 __func__, tmp_res); 4687 } 4688 } 4689 4690 return res; 4691 } 4692 4693 /** 4694 * bond_get_slave_by_id - get xmit slave with slave_id 4695 * @bond: bonding device that is transmitting 4696 * @slave_id: slave id up to slave_cnt-1 through which to transmit 4697 * 4698 * This function tries to get slave with slave_id but in case 4699 * it fails, it tries to find the first available slave for transmission. 4700 */ 4701 static struct slave *bond_get_slave_by_id(struct bonding *bond, 4702 int slave_id) 4703 { 4704 struct list_head *iter; 4705 struct slave *slave; 4706 int i = slave_id; 4707 4708 /* Here we start from the slave with slave_id */ 4709 bond_for_each_slave_rcu(bond, slave, iter) { 4710 if (--i < 0) { 4711 if (bond_slave_can_tx(slave)) 4712 return slave; 4713 } 4714 } 4715 4716 /* Here we start from the first slave up to slave_id */ 4717 i = slave_id; 4718 bond_for_each_slave_rcu(bond, slave, iter) { 4719 if (--i < 0) 4720 break; 4721 if (bond_slave_can_tx(slave)) 4722 return slave; 4723 } 4724 /* no slave that can tx has been found */ 4725 return NULL; 4726 } 4727 4728 /** 4729 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave 4730 * @bond: bonding device to use 4731 * 4732 * Based on the value of the bonding device's packets_per_slave parameter 4733 * this function generates a slave id, which is usually used as the next 4734 * slave to transmit through. 4735 */ 4736 static u32 bond_rr_gen_slave_id(struct bonding *bond) 4737 { 4738 u32 slave_id; 4739 struct reciprocal_value reciprocal_packets_per_slave; 4740 int packets_per_slave = bond->params.packets_per_slave; 4741 4742 switch (packets_per_slave) { 4743 case 0: 4744 slave_id = prandom_u32(); 4745 break; 4746 case 1: 4747 slave_id = this_cpu_inc_return(*bond->rr_tx_counter); 4748 break; 4749 default: 4750 reciprocal_packets_per_slave = 4751 bond->params.reciprocal_packets_per_slave; 4752 slave_id = this_cpu_inc_return(*bond->rr_tx_counter); 4753 slave_id = reciprocal_divide(slave_id, 4754 reciprocal_packets_per_slave); 4755 break; 4756 } 4757 4758 return slave_id; 4759 } 4760 4761 static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond, 4762 struct sk_buff *skb) 4763 { 4764 struct slave *slave; 4765 int slave_cnt; 4766 u32 slave_id; 4767 4768 /* Start with the curr_active_slave that joined the bond as the 4769 * default for sending IGMP traffic. For failover purposes one 4770 * needs to maintain some consistency for the interface that will 4771 * send the join/membership reports. The curr_active_slave found 4772 * will send all of this type of traffic. 4773 */ 4774 if (skb->protocol == htons(ETH_P_IP)) { 4775 int noff = skb_network_offset(skb); 4776 struct iphdr *iph; 4777 4778 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph)))) 4779 goto non_igmp; 4780 4781 iph = ip_hdr(skb); 4782 if (iph->protocol == IPPROTO_IGMP) { 4783 slave = rcu_dereference(bond->curr_active_slave); 4784 if (slave) 4785 return slave; 4786 return bond_get_slave_by_id(bond, 0); 4787 } 4788 } 4789 4790 non_igmp: 4791 slave_cnt = READ_ONCE(bond->slave_cnt); 4792 if (likely(slave_cnt)) { 4793 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt; 4794 return bond_get_slave_by_id(bond, slave_id); 4795 } 4796 return NULL; 4797 } 4798 4799 static struct slave *bond_xdp_xmit_roundrobin_slave_get(struct bonding *bond, 4800 struct xdp_buff *xdp) 4801 { 4802 struct slave *slave; 4803 int slave_cnt; 4804 u32 slave_id; 4805 const struct ethhdr *eth; 4806 void *data = xdp->data; 4807 4808 if (data + sizeof(struct ethhdr) > xdp->data_end) 4809 goto non_igmp; 4810 4811 eth = (struct ethhdr *)data; 4812 data += sizeof(struct ethhdr); 4813 4814 /* See comment on IGMP in bond_xmit_roundrobin_slave_get() */ 4815 if (eth->h_proto == htons(ETH_P_IP)) { 4816 const struct iphdr *iph; 4817 4818 if (data + sizeof(struct iphdr) > xdp->data_end) 4819 goto non_igmp; 4820 4821 iph = (struct iphdr *)data; 4822 4823 if (iph->protocol == IPPROTO_IGMP) { 4824 slave = rcu_dereference(bond->curr_active_slave); 4825 if (slave) 4826 return slave; 4827 return bond_get_slave_by_id(bond, 0); 4828 } 4829 } 4830 4831 non_igmp: 4832 slave_cnt = READ_ONCE(bond->slave_cnt); 4833 if (likely(slave_cnt)) { 4834 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt; 4835 return bond_get_slave_by_id(bond, slave_id); 4836 } 4837 return NULL; 4838 } 4839 4840 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb, 4841 struct net_device *bond_dev) 4842 { 4843 struct bonding *bond = netdev_priv(bond_dev); 4844 struct slave *slave; 4845 4846 slave = bond_xmit_roundrobin_slave_get(bond, skb); 4847 if (likely(slave)) 4848 return bond_dev_queue_xmit(bond, skb, slave->dev); 4849 4850 return bond_tx_drop(bond_dev, skb); 4851 } 4852 4853 static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond) 4854 { 4855 return rcu_dereference(bond->curr_active_slave); 4856 } 4857 4858 /* In active-backup mode, we know that bond->curr_active_slave is always valid if 4859 * the bond has a usable interface. 4860 */ 4861 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb, 4862 struct net_device *bond_dev) 4863 { 4864 struct bonding *bond = netdev_priv(bond_dev); 4865 struct slave *slave; 4866 4867 slave = bond_xmit_activebackup_slave_get(bond); 4868 if (slave) 4869 return bond_dev_queue_xmit(bond, skb, slave->dev); 4870 4871 return bond_tx_drop(bond_dev, skb); 4872 } 4873 4874 /* Use this to update slave_array when (a) it's not appropriate to update 4875 * slave_array right away (note that update_slave_array() may sleep) 4876 * and / or (b) RTNL is not held. 4877 */ 4878 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay) 4879 { 4880 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay); 4881 } 4882 4883 /* Slave array work handler. Holds only RTNL */ 4884 static void bond_slave_arr_handler(struct work_struct *work) 4885 { 4886 struct bonding *bond = container_of(work, struct bonding, 4887 slave_arr_work.work); 4888 int ret; 4889 4890 if (!rtnl_trylock()) 4891 goto err; 4892 4893 ret = bond_update_slave_arr(bond, NULL); 4894 rtnl_unlock(); 4895 if (ret) { 4896 pr_warn_ratelimited("Failed to update slave array from WT\n"); 4897 goto err; 4898 } 4899 return; 4900 4901 err: 4902 bond_slave_arr_work_rearm(bond, 1); 4903 } 4904 4905 static void bond_skip_slave(struct bond_up_slave *slaves, 4906 struct slave *skipslave) 4907 { 4908 int idx; 4909 4910 /* Rare situation where caller has asked to skip a specific 4911 * slave but allocation failed (most likely!). BTW this is 4912 * only possible when the call is initiated from 4913 * __bond_release_one(). In this situation; overwrite the 4914 * skipslave entry in the array with the last entry from the 4915 * array to avoid a situation where the xmit path may choose 4916 * this to-be-skipped slave to send a packet out. 4917 */ 4918 for (idx = 0; slaves && idx < slaves->count; idx++) { 4919 if (skipslave == slaves->arr[idx]) { 4920 slaves->arr[idx] = 4921 slaves->arr[slaves->count - 1]; 4922 slaves->count--; 4923 break; 4924 } 4925 } 4926 } 4927 4928 static void bond_set_slave_arr(struct bonding *bond, 4929 struct bond_up_slave *usable_slaves, 4930 struct bond_up_slave *all_slaves) 4931 { 4932 struct bond_up_slave *usable, *all; 4933 4934 usable = rtnl_dereference(bond->usable_slaves); 4935 rcu_assign_pointer(bond->usable_slaves, usable_slaves); 4936 kfree_rcu(usable, rcu); 4937 4938 all = rtnl_dereference(bond->all_slaves); 4939 rcu_assign_pointer(bond->all_slaves, all_slaves); 4940 kfree_rcu(all, rcu); 4941 } 4942 4943 static void bond_reset_slave_arr(struct bonding *bond) 4944 { 4945 struct bond_up_slave *usable, *all; 4946 4947 usable = rtnl_dereference(bond->usable_slaves); 4948 if (usable) { 4949 RCU_INIT_POINTER(bond->usable_slaves, NULL); 4950 kfree_rcu(usable, rcu); 4951 } 4952 4953 all = rtnl_dereference(bond->all_slaves); 4954 if (all) { 4955 RCU_INIT_POINTER(bond->all_slaves, NULL); 4956 kfree_rcu(all, rcu); 4957 } 4958 } 4959 4960 /* Build the usable slaves array in control path for modes that use xmit-hash 4961 * to determine the slave interface - 4962 * (a) BOND_MODE_8023AD 4963 * (b) BOND_MODE_XOR 4964 * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0 4965 * 4966 * The caller is expected to hold RTNL only and NO other lock! 4967 */ 4968 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave) 4969 { 4970 struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL; 4971 struct slave *slave; 4972 struct list_head *iter; 4973 int agg_id = 0; 4974 int ret = 0; 4975 4976 might_sleep(); 4977 4978 usable_slaves = kzalloc(struct_size(usable_slaves, arr, 4979 bond->slave_cnt), GFP_KERNEL); 4980 all_slaves = kzalloc(struct_size(all_slaves, arr, 4981 bond->slave_cnt), GFP_KERNEL); 4982 if (!usable_slaves || !all_slaves) { 4983 ret = -ENOMEM; 4984 goto out; 4985 } 4986 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 4987 struct ad_info ad_info; 4988 4989 spin_lock_bh(&bond->mode_lock); 4990 if (bond_3ad_get_active_agg_info(bond, &ad_info)) { 4991 spin_unlock_bh(&bond->mode_lock); 4992 pr_debug("bond_3ad_get_active_agg_info failed\n"); 4993 /* No active aggragator means it's not safe to use 4994 * the previous array. 4995 */ 4996 bond_reset_slave_arr(bond); 4997 goto out; 4998 } 4999 spin_unlock_bh(&bond->mode_lock); 5000 agg_id = ad_info.aggregator_id; 5001 } 5002 bond_for_each_slave(bond, slave, iter) { 5003 if (skipslave == slave) 5004 continue; 5005 5006 all_slaves->arr[all_slaves->count++] = slave; 5007 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 5008 struct aggregator *agg; 5009 5010 agg = SLAVE_AD_INFO(slave)->port.aggregator; 5011 if (!agg || agg->aggregator_identifier != agg_id) 5012 continue; 5013 } 5014 if (!bond_slave_can_tx(slave)) 5015 continue; 5016 5017 slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n", 5018 usable_slaves->count); 5019 5020 usable_slaves->arr[usable_slaves->count++] = slave; 5021 } 5022 5023 bond_set_slave_arr(bond, usable_slaves, all_slaves); 5024 return ret; 5025 out: 5026 if (ret != 0 && skipslave) { 5027 bond_skip_slave(rtnl_dereference(bond->all_slaves), 5028 skipslave); 5029 bond_skip_slave(rtnl_dereference(bond->usable_slaves), 5030 skipslave); 5031 } 5032 kfree_rcu(all_slaves, rcu); 5033 kfree_rcu(usable_slaves, rcu); 5034 5035 return ret; 5036 } 5037 5038 static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond, 5039 struct sk_buff *skb, 5040 struct bond_up_slave *slaves) 5041 { 5042 struct slave *slave; 5043 unsigned int count; 5044 u32 hash; 5045 5046 hash = bond_xmit_hash(bond, skb); 5047 count = slaves ? READ_ONCE(slaves->count) : 0; 5048 if (unlikely(!count)) 5049 return NULL; 5050 5051 slave = slaves->arr[hash % count]; 5052 return slave; 5053 } 5054 5055 static struct slave *bond_xdp_xmit_3ad_xor_slave_get(struct bonding *bond, 5056 struct xdp_buff *xdp) 5057 { 5058 struct bond_up_slave *slaves; 5059 unsigned int count; 5060 u32 hash; 5061 5062 hash = bond_xmit_hash_xdp(bond, xdp); 5063 slaves = rcu_dereference(bond->usable_slaves); 5064 count = slaves ? READ_ONCE(slaves->count) : 0; 5065 if (unlikely(!count)) 5066 return NULL; 5067 5068 return slaves->arr[hash % count]; 5069 } 5070 5071 /* Use this Xmit function for 3AD as well as XOR modes. The current 5072 * usable slave array is formed in the control path. The xmit function 5073 * just calculates hash and sends the packet out. 5074 */ 5075 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb, 5076 struct net_device *dev) 5077 { 5078 struct bonding *bond = netdev_priv(dev); 5079 struct bond_up_slave *slaves; 5080 struct slave *slave; 5081 5082 slaves = rcu_dereference(bond->usable_slaves); 5083 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves); 5084 if (likely(slave)) 5085 return bond_dev_queue_xmit(bond, skb, slave->dev); 5086 5087 return bond_tx_drop(dev, skb); 5088 } 5089 5090 /* in broadcast mode, we send everything to all usable interfaces. */ 5091 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb, 5092 struct net_device *bond_dev) 5093 { 5094 struct bonding *bond = netdev_priv(bond_dev); 5095 struct slave *slave = NULL; 5096 struct list_head *iter; 5097 bool xmit_suc = false; 5098 bool skb_used = false; 5099 5100 bond_for_each_slave_rcu(bond, slave, iter) { 5101 struct sk_buff *skb2; 5102 5103 if (!(bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)) 5104 continue; 5105 5106 if (bond_is_last_slave(bond, slave)) { 5107 skb2 = skb; 5108 skb_used = true; 5109 } else { 5110 skb2 = skb_clone(skb, GFP_ATOMIC); 5111 if (!skb2) { 5112 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n", 5113 bond_dev->name, __func__); 5114 continue; 5115 } 5116 } 5117 5118 if (bond_dev_queue_xmit(bond, skb2, slave->dev) == NETDEV_TX_OK) 5119 xmit_suc = true; 5120 } 5121 5122 if (!skb_used) 5123 dev_kfree_skb_any(skb); 5124 5125 if (xmit_suc) 5126 return NETDEV_TX_OK; 5127 5128 dev_core_stats_tx_dropped_inc(bond_dev); 5129 return NET_XMIT_DROP; 5130 } 5131 5132 /*------------------------- Device initialization ---------------------------*/ 5133 5134 /* Lookup the slave that corresponds to a qid */ 5135 static inline int bond_slave_override(struct bonding *bond, 5136 struct sk_buff *skb) 5137 { 5138 struct slave *slave = NULL; 5139 struct list_head *iter; 5140 5141 if (!skb_rx_queue_recorded(skb)) 5142 return 1; 5143 5144 /* Find out if any slaves have the same mapping as this skb. */ 5145 bond_for_each_slave_rcu(bond, slave, iter) { 5146 if (slave->queue_id == skb_get_queue_mapping(skb)) { 5147 if (bond_slave_is_up(slave) && 5148 slave->link == BOND_LINK_UP) { 5149 bond_dev_queue_xmit(bond, skb, slave->dev); 5150 return 0; 5151 } 5152 /* If the slave isn't UP, use default transmit policy. */ 5153 break; 5154 } 5155 } 5156 5157 return 1; 5158 } 5159 5160 5161 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb, 5162 struct net_device *sb_dev) 5163 { 5164 /* This helper function exists to help dev_pick_tx get the correct 5165 * destination queue. Using a helper function skips a call to 5166 * skb_tx_hash and will put the skbs in the queue we expect on their 5167 * way down to the bonding driver. 5168 */ 5169 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 5170 5171 /* Save the original txq to restore before passing to the driver */ 5172 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb); 5173 5174 if (unlikely(txq >= dev->real_num_tx_queues)) { 5175 do { 5176 txq -= dev->real_num_tx_queues; 5177 } while (txq >= dev->real_num_tx_queues); 5178 } 5179 return txq; 5180 } 5181 5182 static struct net_device *bond_xmit_get_slave(struct net_device *master_dev, 5183 struct sk_buff *skb, 5184 bool all_slaves) 5185 { 5186 struct bonding *bond = netdev_priv(master_dev); 5187 struct bond_up_slave *slaves; 5188 struct slave *slave = NULL; 5189 5190 switch (BOND_MODE(bond)) { 5191 case BOND_MODE_ROUNDROBIN: 5192 slave = bond_xmit_roundrobin_slave_get(bond, skb); 5193 break; 5194 case BOND_MODE_ACTIVEBACKUP: 5195 slave = bond_xmit_activebackup_slave_get(bond); 5196 break; 5197 case BOND_MODE_8023AD: 5198 case BOND_MODE_XOR: 5199 if (all_slaves) 5200 slaves = rcu_dereference(bond->all_slaves); 5201 else 5202 slaves = rcu_dereference(bond->usable_slaves); 5203 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves); 5204 break; 5205 case BOND_MODE_BROADCAST: 5206 break; 5207 case BOND_MODE_ALB: 5208 slave = bond_xmit_alb_slave_get(bond, skb); 5209 break; 5210 case BOND_MODE_TLB: 5211 slave = bond_xmit_tlb_slave_get(bond, skb); 5212 break; 5213 default: 5214 /* Should never happen, mode already checked */ 5215 WARN_ONCE(true, "Unknown bonding mode"); 5216 break; 5217 } 5218 5219 if (slave) 5220 return slave->dev; 5221 return NULL; 5222 } 5223 5224 static void bond_sk_to_flow(struct sock *sk, struct flow_keys *flow) 5225 { 5226 switch (sk->sk_family) { 5227 #if IS_ENABLED(CONFIG_IPV6) 5228 case AF_INET6: 5229 if (ipv6_only_sock(sk) || 5230 ipv6_addr_type(&sk->sk_v6_daddr) != IPV6_ADDR_MAPPED) { 5231 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; 5232 flow->addrs.v6addrs.src = inet6_sk(sk)->saddr; 5233 flow->addrs.v6addrs.dst = sk->sk_v6_daddr; 5234 break; 5235 } 5236 fallthrough; 5237 #endif 5238 default: /* AF_INET */ 5239 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; 5240 flow->addrs.v4addrs.src = inet_sk(sk)->inet_rcv_saddr; 5241 flow->addrs.v4addrs.dst = inet_sk(sk)->inet_daddr; 5242 break; 5243 } 5244 5245 flow->ports.src = inet_sk(sk)->inet_sport; 5246 flow->ports.dst = inet_sk(sk)->inet_dport; 5247 } 5248 5249 /** 5250 * bond_sk_hash_l34 - generate a hash value based on the socket's L3 and L4 fields 5251 * @sk: socket to use for headers 5252 * 5253 * This function will extract the necessary field from the socket and use 5254 * them to generate a hash based on the LAYER34 xmit_policy. 5255 * Assumes that sk is a TCP or UDP socket. 5256 */ 5257 static u32 bond_sk_hash_l34(struct sock *sk) 5258 { 5259 struct flow_keys flow; 5260 u32 hash; 5261 5262 bond_sk_to_flow(sk, &flow); 5263 5264 /* L4 */ 5265 memcpy(&hash, &flow.ports.ports, sizeof(hash)); 5266 /* L3 */ 5267 return bond_ip_hash(hash, &flow, BOND_XMIT_POLICY_LAYER34); 5268 } 5269 5270 static struct net_device *__bond_sk_get_lower_dev(struct bonding *bond, 5271 struct sock *sk) 5272 { 5273 struct bond_up_slave *slaves; 5274 struct slave *slave; 5275 unsigned int count; 5276 u32 hash; 5277 5278 slaves = rcu_dereference(bond->usable_slaves); 5279 count = slaves ? READ_ONCE(slaves->count) : 0; 5280 if (unlikely(!count)) 5281 return NULL; 5282 5283 hash = bond_sk_hash_l34(sk); 5284 slave = slaves->arr[hash % count]; 5285 5286 return slave->dev; 5287 } 5288 5289 static struct net_device *bond_sk_get_lower_dev(struct net_device *dev, 5290 struct sock *sk) 5291 { 5292 struct bonding *bond = netdev_priv(dev); 5293 struct net_device *lower = NULL; 5294 5295 rcu_read_lock(); 5296 if (bond_sk_check(bond)) 5297 lower = __bond_sk_get_lower_dev(bond, sk); 5298 rcu_read_unlock(); 5299 5300 return lower; 5301 } 5302 5303 #if IS_ENABLED(CONFIG_TLS_DEVICE) 5304 static netdev_tx_t bond_tls_device_xmit(struct bonding *bond, struct sk_buff *skb, 5305 struct net_device *dev) 5306 { 5307 if (likely(bond_get_slave_by_dev(bond, tls_get_ctx(skb->sk)->netdev))) 5308 return bond_dev_queue_xmit(bond, skb, tls_get_ctx(skb->sk)->netdev); 5309 return bond_tx_drop(dev, skb); 5310 } 5311 #endif 5312 5313 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 5314 { 5315 struct bonding *bond = netdev_priv(dev); 5316 5317 if (bond_should_override_tx_queue(bond) && 5318 !bond_slave_override(bond, skb)) 5319 return NETDEV_TX_OK; 5320 5321 #if IS_ENABLED(CONFIG_TLS_DEVICE) 5322 if (skb->sk && tls_is_sk_tx_device_offloaded(skb->sk)) 5323 return bond_tls_device_xmit(bond, skb, dev); 5324 #endif 5325 5326 switch (BOND_MODE(bond)) { 5327 case BOND_MODE_ROUNDROBIN: 5328 return bond_xmit_roundrobin(skb, dev); 5329 case BOND_MODE_ACTIVEBACKUP: 5330 return bond_xmit_activebackup(skb, dev); 5331 case BOND_MODE_8023AD: 5332 case BOND_MODE_XOR: 5333 return bond_3ad_xor_xmit(skb, dev); 5334 case BOND_MODE_BROADCAST: 5335 return bond_xmit_broadcast(skb, dev); 5336 case BOND_MODE_ALB: 5337 return bond_alb_xmit(skb, dev); 5338 case BOND_MODE_TLB: 5339 return bond_tlb_xmit(skb, dev); 5340 default: 5341 /* Should never happen, mode already checked */ 5342 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond)); 5343 WARN_ON_ONCE(1); 5344 return bond_tx_drop(dev, skb); 5345 } 5346 } 5347 5348 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 5349 { 5350 struct bonding *bond = netdev_priv(dev); 5351 netdev_tx_t ret = NETDEV_TX_OK; 5352 5353 /* If we risk deadlock from transmitting this in the 5354 * netpoll path, tell netpoll to queue the frame for later tx 5355 */ 5356 if (unlikely(is_netpoll_tx_blocked(dev))) 5357 return NETDEV_TX_BUSY; 5358 5359 rcu_read_lock(); 5360 if (bond_has_slaves(bond)) 5361 ret = __bond_start_xmit(skb, dev); 5362 else 5363 ret = bond_tx_drop(dev, skb); 5364 rcu_read_unlock(); 5365 5366 return ret; 5367 } 5368 5369 static struct net_device * 5370 bond_xdp_get_xmit_slave(struct net_device *bond_dev, struct xdp_buff *xdp) 5371 { 5372 struct bonding *bond = netdev_priv(bond_dev); 5373 struct slave *slave; 5374 5375 /* Caller needs to hold rcu_read_lock() */ 5376 5377 switch (BOND_MODE(bond)) { 5378 case BOND_MODE_ROUNDROBIN: 5379 slave = bond_xdp_xmit_roundrobin_slave_get(bond, xdp); 5380 break; 5381 5382 case BOND_MODE_ACTIVEBACKUP: 5383 slave = bond_xmit_activebackup_slave_get(bond); 5384 break; 5385 5386 case BOND_MODE_8023AD: 5387 case BOND_MODE_XOR: 5388 slave = bond_xdp_xmit_3ad_xor_slave_get(bond, xdp); 5389 break; 5390 5391 default: 5392 /* Should never happen. Mode guarded by bond_xdp_check() */ 5393 netdev_err(bond_dev, "Unknown bonding mode %d for xdp xmit\n", BOND_MODE(bond)); 5394 WARN_ON_ONCE(1); 5395 return NULL; 5396 } 5397 5398 if (slave) 5399 return slave->dev; 5400 5401 return NULL; 5402 } 5403 5404 static int bond_xdp_xmit(struct net_device *bond_dev, 5405 int n, struct xdp_frame **frames, u32 flags) 5406 { 5407 int nxmit, err = -ENXIO; 5408 5409 rcu_read_lock(); 5410 5411 for (nxmit = 0; nxmit < n; nxmit++) { 5412 struct xdp_frame *frame = frames[nxmit]; 5413 struct xdp_frame *frames1[] = {frame}; 5414 struct net_device *slave_dev; 5415 struct xdp_buff xdp; 5416 5417 xdp_convert_frame_to_buff(frame, &xdp); 5418 5419 slave_dev = bond_xdp_get_xmit_slave(bond_dev, &xdp); 5420 if (!slave_dev) { 5421 err = -ENXIO; 5422 break; 5423 } 5424 5425 err = slave_dev->netdev_ops->ndo_xdp_xmit(slave_dev, 1, frames1, flags); 5426 if (err < 1) 5427 break; 5428 } 5429 5430 rcu_read_unlock(); 5431 5432 /* If error happened on the first frame then we can pass the error up, otherwise 5433 * report the number of frames that were xmitted. 5434 */ 5435 if (err < 0) 5436 return (nxmit == 0 ? err : nxmit); 5437 5438 return nxmit; 5439 } 5440 5441 static int bond_xdp_set(struct net_device *dev, struct bpf_prog *prog, 5442 struct netlink_ext_ack *extack) 5443 { 5444 struct bonding *bond = netdev_priv(dev); 5445 struct list_head *iter; 5446 struct slave *slave, *rollback_slave; 5447 struct bpf_prog *old_prog; 5448 struct netdev_bpf xdp = { 5449 .command = XDP_SETUP_PROG, 5450 .flags = 0, 5451 .prog = prog, 5452 .extack = extack, 5453 }; 5454 int err; 5455 5456 ASSERT_RTNL(); 5457 5458 if (!bond_xdp_check(bond)) 5459 return -EOPNOTSUPP; 5460 5461 old_prog = bond->xdp_prog; 5462 bond->xdp_prog = prog; 5463 5464 bond_for_each_slave(bond, slave, iter) { 5465 struct net_device *slave_dev = slave->dev; 5466 5467 if (!slave_dev->netdev_ops->ndo_bpf || 5468 !slave_dev->netdev_ops->ndo_xdp_xmit) { 5469 SLAVE_NL_ERR(dev, slave_dev, extack, 5470 "Slave device does not support XDP"); 5471 err = -EOPNOTSUPP; 5472 goto err; 5473 } 5474 5475 if (dev_xdp_prog_count(slave_dev) > 0) { 5476 SLAVE_NL_ERR(dev, slave_dev, extack, 5477 "Slave has XDP program loaded, please unload before enslaving"); 5478 err = -EOPNOTSUPP; 5479 goto err; 5480 } 5481 5482 err = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 5483 if (err < 0) { 5484 /* ndo_bpf() sets extack error message */ 5485 slave_err(dev, slave_dev, "Error %d calling ndo_bpf\n", err); 5486 goto err; 5487 } 5488 if (prog) 5489 bpf_prog_inc(prog); 5490 } 5491 5492 if (prog) { 5493 static_branch_inc(&bpf_master_redirect_enabled_key); 5494 } else if (old_prog) { 5495 bpf_prog_put(old_prog); 5496 static_branch_dec(&bpf_master_redirect_enabled_key); 5497 } 5498 5499 return 0; 5500 5501 err: 5502 /* unwind the program changes */ 5503 bond->xdp_prog = old_prog; 5504 xdp.prog = old_prog; 5505 xdp.extack = NULL; /* do not overwrite original error */ 5506 5507 bond_for_each_slave(bond, rollback_slave, iter) { 5508 struct net_device *slave_dev = rollback_slave->dev; 5509 int err_unwind; 5510 5511 if (slave == rollback_slave) 5512 break; 5513 5514 err_unwind = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 5515 if (err_unwind < 0) 5516 slave_err(dev, slave_dev, 5517 "Error %d when unwinding XDP program change\n", err_unwind); 5518 else if (xdp.prog) 5519 bpf_prog_inc(xdp.prog); 5520 } 5521 return err; 5522 } 5523 5524 static int bond_xdp(struct net_device *dev, struct netdev_bpf *xdp) 5525 { 5526 switch (xdp->command) { 5527 case XDP_SETUP_PROG: 5528 return bond_xdp_set(dev, xdp->prog, xdp->extack); 5529 default: 5530 return -EINVAL; 5531 } 5532 } 5533 5534 static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed) 5535 { 5536 if (speed == 0 || speed == SPEED_UNKNOWN) 5537 speed = slave->speed; 5538 else 5539 speed = min(speed, slave->speed); 5540 5541 return speed; 5542 } 5543 5544 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev, 5545 struct ethtool_link_ksettings *cmd) 5546 { 5547 struct bonding *bond = netdev_priv(bond_dev); 5548 struct list_head *iter; 5549 struct slave *slave; 5550 u32 speed = 0; 5551 5552 cmd->base.duplex = DUPLEX_UNKNOWN; 5553 cmd->base.port = PORT_OTHER; 5554 5555 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we 5556 * do not need to check mode. Though link speed might not represent 5557 * the true receive or transmit bandwidth (not all modes are symmetric) 5558 * this is an accurate maximum. 5559 */ 5560 bond_for_each_slave(bond, slave, iter) { 5561 if (bond_slave_can_tx(slave)) { 5562 if (slave->speed != SPEED_UNKNOWN) { 5563 if (BOND_MODE(bond) == BOND_MODE_BROADCAST) 5564 speed = bond_mode_bcast_speed(slave, 5565 speed); 5566 else 5567 speed += slave->speed; 5568 } 5569 if (cmd->base.duplex == DUPLEX_UNKNOWN && 5570 slave->duplex != DUPLEX_UNKNOWN) 5571 cmd->base.duplex = slave->duplex; 5572 } 5573 } 5574 cmd->base.speed = speed ? : SPEED_UNKNOWN; 5575 5576 return 0; 5577 } 5578 5579 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 5580 struct ethtool_drvinfo *drvinfo) 5581 { 5582 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver)); 5583 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d", 5584 BOND_ABI_VERSION); 5585 } 5586 5587 static int bond_ethtool_get_ts_info(struct net_device *bond_dev, 5588 struct ethtool_ts_info *info) 5589 { 5590 struct bonding *bond = netdev_priv(bond_dev); 5591 const struct ethtool_ops *ops; 5592 struct net_device *real_dev; 5593 struct phy_device *phydev; 5594 int ret = 0; 5595 5596 rcu_read_lock(); 5597 real_dev = bond_option_active_slave_get_rcu(bond); 5598 dev_hold(real_dev); 5599 rcu_read_unlock(); 5600 5601 if (real_dev) { 5602 ops = real_dev->ethtool_ops; 5603 phydev = real_dev->phydev; 5604 5605 if (phy_has_tsinfo(phydev)) { 5606 ret = phy_ts_info(phydev, info); 5607 goto out; 5608 } else if (ops->get_ts_info) { 5609 ret = ops->get_ts_info(real_dev, info); 5610 goto out; 5611 } 5612 } 5613 5614 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE | 5615 SOF_TIMESTAMPING_SOFTWARE; 5616 info->phc_index = -1; 5617 5618 out: 5619 dev_put(real_dev); 5620 return ret; 5621 } 5622 5623 static const struct ethtool_ops bond_ethtool_ops = { 5624 .get_drvinfo = bond_ethtool_get_drvinfo, 5625 .get_link = ethtool_op_get_link, 5626 .get_link_ksettings = bond_ethtool_get_link_ksettings, 5627 .get_ts_info = bond_ethtool_get_ts_info, 5628 }; 5629 5630 static const struct net_device_ops bond_netdev_ops = { 5631 .ndo_init = bond_init, 5632 .ndo_uninit = bond_uninit, 5633 .ndo_open = bond_open, 5634 .ndo_stop = bond_close, 5635 .ndo_start_xmit = bond_start_xmit, 5636 .ndo_select_queue = bond_select_queue, 5637 .ndo_get_stats64 = bond_get_stats, 5638 .ndo_eth_ioctl = bond_eth_ioctl, 5639 .ndo_siocbond = bond_do_ioctl, 5640 .ndo_siocdevprivate = bond_siocdevprivate, 5641 .ndo_change_rx_flags = bond_change_rx_flags, 5642 .ndo_set_rx_mode = bond_set_rx_mode, 5643 .ndo_change_mtu = bond_change_mtu, 5644 .ndo_set_mac_address = bond_set_mac_address, 5645 .ndo_neigh_setup = bond_neigh_setup, 5646 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 5647 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 5648 #ifdef CONFIG_NET_POLL_CONTROLLER 5649 .ndo_netpoll_setup = bond_netpoll_setup, 5650 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 5651 .ndo_poll_controller = bond_poll_controller, 5652 #endif 5653 .ndo_add_slave = bond_enslave, 5654 .ndo_del_slave = bond_release, 5655 .ndo_fix_features = bond_fix_features, 5656 .ndo_features_check = passthru_features_check, 5657 .ndo_get_xmit_slave = bond_xmit_get_slave, 5658 .ndo_sk_get_lower_dev = bond_sk_get_lower_dev, 5659 .ndo_bpf = bond_xdp, 5660 .ndo_xdp_xmit = bond_xdp_xmit, 5661 .ndo_xdp_get_xmit_slave = bond_xdp_get_xmit_slave, 5662 }; 5663 5664 static const struct device_type bond_type = { 5665 .name = "bond", 5666 }; 5667 5668 static void bond_destructor(struct net_device *bond_dev) 5669 { 5670 struct bonding *bond = netdev_priv(bond_dev); 5671 5672 if (bond->wq) 5673 destroy_workqueue(bond->wq); 5674 5675 if (bond->rr_tx_counter) 5676 free_percpu(bond->rr_tx_counter); 5677 } 5678 5679 void bond_setup(struct net_device *bond_dev) 5680 { 5681 struct bonding *bond = netdev_priv(bond_dev); 5682 5683 spin_lock_init(&bond->mode_lock); 5684 bond->params = bonding_defaults; 5685 5686 /* Initialize pointers */ 5687 bond->dev = bond_dev; 5688 5689 /* Initialize the device entry points */ 5690 ether_setup(bond_dev); 5691 bond_dev->max_mtu = ETH_MAX_MTU; 5692 bond_dev->netdev_ops = &bond_netdev_ops; 5693 bond_dev->ethtool_ops = &bond_ethtool_ops; 5694 5695 bond_dev->needs_free_netdev = true; 5696 bond_dev->priv_destructor = bond_destructor; 5697 5698 SET_NETDEV_DEVTYPE(bond_dev, &bond_type); 5699 5700 /* Initialize the device options */ 5701 bond_dev->flags |= IFF_MASTER; 5702 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE; 5703 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 5704 5705 #ifdef CONFIG_XFRM_OFFLOAD 5706 /* set up xfrm device ops (only supported in active-backup right now) */ 5707 bond_dev->xfrmdev_ops = &bond_xfrmdev_ops; 5708 INIT_LIST_HEAD(&bond->ipsec_list); 5709 spin_lock_init(&bond->ipsec_lock); 5710 #endif /* CONFIG_XFRM_OFFLOAD */ 5711 5712 /* don't acquire bond device's netif_tx_lock when transmitting */ 5713 bond_dev->features |= NETIF_F_LLTX; 5714 5715 /* By default, we declare the bond to be fully 5716 * VLAN hardware accelerated capable. Special 5717 * care is taken in the various xmit functions 5718 * when there are slaves that are not hw accel 5719 * capable 5720 */ 5721 5722 /* Don't allow bond devices to change network namespaces. */ 5723 bond_dev->features |= NETIF_F_NETNS_LOCAL; 5724 5725 bond_dev->hw_features = BOND_VLAN_FEATURES | 5726 NETIF_F_HW_VLAN_CTAG_RX | 5727 NETIF_F_HW_VLAN_CTAG_FILTER; 5728 5729 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL; 5730 bond_dev->features |= bond_dev->hw_features; 5731 bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; 5732 #ifdef CONFIG_XFRM_OFFLOAD 5733 bond_dev->hw_features |= BOND_XFRM_FEATURES; 5734 /* Only enable XFRM features if this is an active-backup config */ 5735 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 5736 bond_dev->features |= BOND_XFRM_FEATURES; 5737 #endif /* CONFIG_XFRM_OFFLOAD */ 5738 #if IS_ENABLED(CONFIG_TLS_DEVICE) 5739 if (bond_sk_check(bond)) 5740 bond_dev->features |= BOND_TLS_FEATURES; 5741 #endif 5742 } 5743 5744 /* Destroy a bonding device. 5745 * Must be under rtnl_lock when this function is called. 5746 */ 5747 static void bond_uninit(struct net_device *bond_dev) 5748 { 5749 struct bonding *bond = netdev_priv(bond_dev); 5750 struct bond_up_slave *usable, *all; 5751 struct list_head *iter; 5752 struct slave *slave; 5753 5754 bond_netpoll_cleanup(bond_dev); 5755 5756 /* Release the bonded slaves */ 5757 bond_for_each_slave(bond, slave, iter) 5758 __bond_release_one(bond_dev, slave->dev, true, true); 5759 netdev_info(bond_dev, "Released all slaves\n"); 5760 5761 usable = rtnl_dereference(bond->usable_slaves); 5762 if (usable) { 5763 RCU_INIT_POINTER(bond->usable_slaves, NULL); 5764 kfree_rcu(usable, rcu); 5765 } 5766 5767 all = rtnl_dereference(bond->all_slaves); 5768 if (all) { 5769 RCU_INIT_POINTER(bond->all_slaves, NULL); 5770 kfree_rcu(all, rcu); 5771 } 5772 5773 list_del(&bond->bond_list); 5774 5775 bond_debug_unregister(bond); 5776 } 5777 5778 /*------------------------- Module initialization ---------------------------*/ 5779 5780 static int bond_check_params(struct bond_params *params) 5781 { 5782 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i; 5783 struct bond_opt_value newval; 5784 const struct bond_opt_value *valptr; 5785 int arp_all_targets_value = 0; 5786 u16 ad_actor_sys_prio = 0; 5787 u16 ad_user_port_key = 0; 5788 __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 }; 5789 int arp_ip_count; 5790 int bond_mode = BOND_MODE_ROUNDROBIN; 5791 int xmit_hashtype = BOND_XMIT_POLICY_LAYER2; 5792 int lacp_fast = 0; 5793 int tlb_dynamic_lb; 5794 5795 /* Convert string parameters. */ 5796 if (mode) { 5797 bond_opt_initstr(&newval, mode); 5798 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval); 5799 if (!valptr) { 5800 pr_err("Error: Invalid bonding mode \"%s\"\n", mode); 5801 return -EINVAL; 5802 } 5803 bond_mode = valptr->value; 5804 } 5805 5806 if (xmit_hash_policy) { 5807 if (bond_mode == BOND_MODE_ROUNDROBIN || 5808 bond_mode == BOND_MODE_ACTIVEBACKUP || 5809 bond_mode == BOND_MODE_BROADCAST) { 5810 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 5811 bond_mode_name(bond_mode)); 5812 } else { 5813 bond_opt_initstr(&newval, xmit_hash_policy); 5814 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH), 5815 &newval); 5816 if (!valptr) { 5817 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 5818 xmit_hash_policy); 5819 return -EINVAL; 5820 } 5821 xmit_hashtype = valptr->value; 5822 } 5823 } 5824 5825 if (lacp_rate) { 5826 if (bond_mode != BOND_MODE_8023AD) { 5827 pr_info("lacp_rate param is irrelevant in mode %s\n", 5828 bond_mode_name(bond_mode)); 5829 } else { 5830 bond_opt_initstr(&newval, lacp_rate); 5831 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE), 5832 &newval); 5833 if (!valptr) { 5834 pr_err("Error: Invalid lacp rate \"%s\"\n", 5835 lacp_rate); 5836 return -EINVAL; 5837 } 5838 lacp_fast = valptr->value; 5839 } 5840 } 5841 5842 if (ad_select) { 5843 bond_opt_initstr(&newval, ad_select); 5844 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT), 5845 &newval); 5846 if (!valptr) { 5847 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select); 5848 return -EINVAL; 5849 } 5850 params->ad_select = valptr->value; 5851 if (bond_mode != BOND_MODE_8023AD) 5852 pr_warn("ad_select param only affects 802.3ad mode\n"); 5853 } else { 5854 params->ad_select = BOND_AD_STABLE; 5855 } 5856 5857 if (max_bonds < 0) { 5858 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 5859 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 5860 max_bonds = BOND_DEFAULT_MAX_BONDS; 5861 } 5862 5863 if (miimon < 0) { 5864 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n", 5865 miimon, INT_MAX); 5866 miimon = 0; 5867 } 5868 5869 if (updelay < 0) { 5870 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 5871 updelay, INT_MAX); 5872 updelay = 0; 5873 } 5874 5875 if (downdelay < 0) { 5876 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 5877 downdelay, INT_MAX); 5878 downdelay = 0; 5879 } 5880 5881 if ((use_carrier != 0) && (use_carrier != 1)) { 5882 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 5883 use_carrier); 5884 use_carrier = 1; 5885 } 5886 5887 if (num_peer_notif < 0 || num_peer_notif > 255) { 5888 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 5889 num_peer_notif); 5890 num_peer_notif = 1; 5891 } 5892 5893 /* reset values for 802.3ad/TLB/ALB */ 5894 if (!bond_mode_uses_arp(bond_mode)) { 5895 if (!miimon) { 5896 pr_warn("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n"); 5897 pr_warn("Forcing miimon to 100msec\n"); 5898 miimon = BOND_DEFAULT_MIIMON; 5899 } 5900 } 5901 5902 if (tx_queues < 1 || tx_queues > 255) { 5903 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n", 5904 tx_queues, BOND_DEFAULT_TX_QUEUES); 5905 tx_queues = BOND_DEFAULT_TX_QUEUES; 5906 } 5907 5908 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 5909 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n", 5910 all_slaves_active); 5911 all_slaves_active = 0; 5912 } 5913 5914 if (resend_igmp < 0 || resend_igmp > 255) { 5915 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n", 5916 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 5917 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 5918 } 5919 5920 bond_opt_initval(&newval, packets_per_slave); 5921 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) { 5922 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n", 5923 packets_per_slave, USHRT_MAX); 5924 packets_per_slave = 1; 5925 } 5926 5927 if (bond_mode == BOND_MODE_ALB) { 5928 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", 5929 updelay); 5930 } 5931 5932 if (!miimon) { 5933 if (updelay || downdelay) { 5934 /* just warn the user the up/down delay will have 5935 * no effect since miimon is zero... 5936 */ 5937 pr_warn("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", 5938 updelay, downdelay); 5939 } 5940 } else { 5941 /* don't allow arp monitoring */ 5942 if (arp_interval) { 5943 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 5944 miimon, arp_interval); 5945 arp_interval = 0; 5946 } 5947 5948 if ((updelay % miimon) != 0) { 5949 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 5950 updelay, miimon, (updelay / miimon) * miimon); 5951 } 5952 5953 updelay /= miimon; 5954 5955 if ((downdelay % miimon) != 0) { 5956 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 5957 downdelay, miimon, 5958 (downdelay / miimon) * miimon); 5959 } 5960 5961 downdelay /= miimon; 5962 } 5963 5964 if (arp_interval < 0) { 5965 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n", 5966 arp_interval, INT_MAX); 5967 arp_interval = 0; 5968 } 5969 5970 for (arp_ip_count = 0, i = 0; 5971 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) { 5972 __be32 ip; 5973 5974 /* not a complete check, but good enough to catch mistakes */ 5975 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) || 5976 !bond_is_ip_target_ok(ip)) { 5977 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 5978 arp_ip_target[i]); 5979 arp_interval = 0; 5980 } else { 5981 if (bond_get_targets_ip(arp_target, ip) == -1) 5982 arp_target[arp_ip_count++] = ip; 5983 else 5984 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n", 5985 &ip); 5986 } 5987 } 5988 5989 if (arp_interval && !arp_ip_count) { 5990 /* don't allow arping if no arp_ip_target given... */ 5991 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 5992 arp_interval); 5993 arp_interval = 0; 5994 } 5995 5996 if (arp_validate) { 5997 if (!arp_interval) { 5998 pr_err("arp_validate requires arp_interval\n"); 5999 return -EINVAL; 6000 } 6001 6002 bond_opt_initstr(&newval, arp_validate); 6003 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE), 6004 &newval); 6005 if (!valptr) { 6006 pr_err("Error: invalid arp_validate \"%s\"\n", 6007 arp_validate); 6008 return -EINVAL; 6009 } 6010 arp_validate_value = valptr->value; 6011 } else { 6012 arp_validate_value = 0; 6013 } 6014 6015 if (arp_all_targets) { 6016 bond_opt_initstr(&newval, arp_all_targets); 6017 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS), 6018 &newval); 6019 if (!valptr) { 6020 pr_err("Error: invalid arp_all_targets_value \"%s\"\n", 6021 arp_all_targets); 6022 arp_all_targets_value = 0; 6023 } else { 6024 arp_all_targets_value = valptr->value; 6025 } 6026 } 6027 6028 if (miimon) { 6029 pr_info("MII link monitoring set to %d ms\n", miimon); 6030 } else if (arp_interval) { 6031 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE, 6032 arp_validate_value); 6033 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 6034 arp_interval, valptr->string, arp_ip_count); 6035 6036 for (i = 0; i < arp_ip_count; i++) 6037 pr_cont(" %s", arp_ip_target[i]); 6038 6039 pr_cont("\n"); 6040 6041 } else if (max_bonds) { 6042 /* miimon and arp_interval not set, we need one so things 6043 * work as expected, see bonding.txt for details 6044 */ 6045 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"); 6046 } 6047 6048 if (primary && !bond_mode_uses_primary(bond_mode)) { 6049 /* currently, using a primary only makes sense 6050 * in active backup, TLB or ALB modes 6051 */ 6052 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n", 6053 primary, bond_mode_name(bond_mode)); 6054 primary = NULL; 6055 } 6056 6057 if (primary && primary_reselect) { 6058 bond_opt_initstr(&newval, primary_reselect); 6059 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT), 6060 &newval); 6061 if (!valptr) { 6062 pr_err("Error: Invalid primary_reselect \"%s\"\n", 6063 primary_reselect); 6064 return -EINVAL; 6065 } 6066 primary_reselect_value = valptr->value; 6067 } else { 6068 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 6069 } 6070 6071 if (fail_over_mac) { 6072 bond_opt_initstr(&newval, fail_over_mac); 6073 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC), 6074 &newval); 6075 if (!valptr) { 6076 pr_err("Error: invalid fail_over_mac \"%s\"\n", 6077 fail_over_mac); 6078 return -EINVAL; 6079 } 6080 fail_over_mac_value = valptr->value; 6081 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 6082 pr_warn("Warning: fail_over_mac only affects active-backup mode\n"); 6083 } else { 6084 fail_over_mac_value = BOND_FOM_NONE; 6085 } 6086 6087 bond_opt_initstr(&newval, "default"); 6088 valptr = bond_opt_parse( 6089 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO), 6090 &newval); 6091 if (!valptr) { 6092 pr_err("Error: No ad_actor_sys_prio default value"); 6093 return -EINVAL; 6094 } 6095 ad_actor_sys_prio = valptr->value; 6096 6097 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY), 6098 &newval); 6099 if (!valptr) { 6100 pr_err("Error: No ad_user_port_key default value"); 6101 return -EINVAL; 6102 } 6103 ad_user_port_key = valptr->value; 6104 6105 bond_opt_initstr(&newval, "default"); 6106 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval); 6107 if (!valptr) { 6108 pr_err("Error: No tlb_dynamic_lb default value"); 6109 return -EINVAL; 6110 } 6111 tlb_dynamic_lb = valptr->value; 6112 6113 if (lp_interval == 0) { 6114 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n", 6115 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL); 6116 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 6117 } 6118 6119 /* fill params struct with the proper values */ 6120 params->mode = bond_mode; 6121 params->xmit_policy = xmit_hashtype; 6122 params->miimon = miimon; 6123 params->num_peer_notif = num_peer_notif; 6124 params->arp_interval = arp_interval; 6125 params->arp_validate = arp_validate_value; 6126 params->arp_all_targets = arp_all_targets_value; 6127 params->missed_max = 2; 6128 params->updelay = updelay; 6129 params->downdelay = downdelay; 6130 params->peer_notif_delay = 0; 6131 params->use_carrier = use_carrier; 6132 params->lacp_active = 1; 6133 params->lacp_fast = lacp_fast; 6134 params->primary[0] = 0; 6135 params->primary_reselect = primary_reselect_value; 6136 params->fail_over_mac = fail_over_mac_value; 6137 params->tx_queues = tx_queues; 6138 params->all_slaves_active = all_slaves_active; 6139 params->resend_igmp = resend_igmp; 6140 params->min_links = min_links; 6141 params->lp_interval = lp_interval; 6142 params->packets_per_slave = packets_per_slave; 6143 params->tlb_dynamic_lb = tlb_dynamic_lb; 6144 params->ad_actor_sys_prio = ad_actor_sys_prio; 6145 eth_zero_addr(params->ad_actor_system); 6146 params->ad_user_port_key = ad_user_port_key; 6147 if (packets_per_slave > 0) { 6148 params->reciprocal_packets_per_slave = 6149 reciprocal_value(packets_per_slave); 6150 } else { 6151 /* reciprocal_packets_per_slave is unused if 6152 * packets_per_slave is 0 or 1, just initialize it 6153 */ 6154 params->reciprocal_packets_per_slave = 6155 (struct reciprocal_value) { 0 }; 6156 } 6157 6158 if (primary) 6159 strscpy_pad(params->primary, primary, sizeof(params->primary)); 6160 6161 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 6162 #if IS_ENABLED(CONFIG_IPV6) 6163 memset(params->ns_targets, 0, sizeof(struct in6_addr) * BOND_MAX_NS_TARGETS); 6164 #endif 6165 6166 return 0; 6167 } 6168 6169 /* Called from registration process */ 6170 static int bond_init(struct net_device *bond_dev) 6171 { 6172 struct bonding *bond = netdev_priv(bond_dev); 6173 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 6174 6175 netdev_dbg(bond_dev, "Begin bond_init\n"); 6176 6177 bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM); 6178 if (!bond->wq) 6179 return -ENOMEM; 6180 6181 if (BOND_MODE(bond) == BOND_MODE_ROUNDROBIN) { 6182 bond->rr_tx_counter = alloc_percpu(u32); 6183 if (!bond->rr_tx_counter) { 6184 destroy_workqueue(bond->wq); 6185 bond->wq = NULL; 6186 return -ENOMEM; 6187 } 6188 } 6189 6190 spin_lock_init(&bond->stats_lock); 6191 netdev_lockdep_set_classes(bond_dev); 6192 6193 list_add_tail(&bond->bond_list, &bn->dev_list); 6194 6195 bond_prepare_sysfs_group(bond); 6196 6197 bond_debug_register(bond); 6198 6199 /* Ensure valid dev_addr */ 6200 if (is_zero_ether_addr(bond_dev->dev_addr) && 6201 bond_dev->addr_assign_type == NET_ADDR_PERM) 6202 eth_hw_addr_random(bond_dev); 6203 6204 return 0; 6205 } 6206 6207 unsigned int bond_get_num_tx_queues(void) 6208 { 6209 return tx_queues; 6210 } 6211 6212 /* Create a new bond based on the specified name and bonding parameters. 6213 * If name is NULL, obtain a suitable "bond%d" name for us. 6214 * Caller must NOT hold rtnl_lock; we need to release it here before we 6215 * set up our sysfs entries. 6216 */ 6217 int bond_create(struct net *net, const char *name) 6218 { 6219 struct net_device *bond_dev; 6220 struct bonding *bond; 6221 struct alb_bond_info *bond_info; 6222 int res; 6223 6224 rtnl_lock(); 6225 6226 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 6227 name ? name : "bond%d", NET_NAME_UNKNOWN, 6228 bond_setup, tx_queues); 6229 if (!bond_dev) { 6230 pr_err("%s: eek! can't alloc netdev!\n", name); 6231 rtnl_unlock(); 6232 return -ENOMEM; 6233 } 6234 6235 /* 6236 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX. 6237 * It is set to 0 by default which is wrong. 6238 */ 6239 bond = netdev_priv(bond_dev); 6240 bond_info = &(BOND_ALB_INFO(bond)); 6241 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX; 6242 6243 dev_net_set(bond_dev, net); 6244 bond_dev->rtnl_link_ops = &bond_link_ops; 6245 6246 res = register_netdevice(bond_dev); 6247 if (res < 0) { 6248 free_netdev(bond_dev); 6249 rtnl_unlock(); 6250 6251 return res; 6252 } 6253 6254 netif_carrier_off(bond_dev); 6255 6256 bond_work_init_all(bond); 6257 6258 rtnl_unlock(); 6259 return 0; 6260 } 6261 6262 static int __net_init bond_net_init(struct net *net) 6263 { 6264 struct bond_net *bn = net_generic(net, bond_net_id); 6265 6266 bn->net = net; 6267 INIT_LIST_HEAD(&bn->dev_list); 6268 6269 bond_create_proc_dir(bn); 6270 bond_create_sysfs(bn); 6271 6272 return 0; 6273 } 6274 6275 static void __net_exit bond_net_exit_batch(struct list_head *net_list) 6276 { 6277 struct bond_net *bn; 6278 struct net *net; 6279 LIST_HEAD(list); 6280 6281 list_for_each_entry(net, net_list, exit_list) { 6282 bn = net_generic(net, bond_net_id); 6283 bond_destroy_sysfs(bn); 6284 } 6285 6286 /* Kill off any bonds created after unregistering bond rtnl ops */ 6287 rtnl_lock(); 6288 list_for_each_entry(net, net_list, exit_list) { 6289 struct bonding *bond, *tmp_bond; 6290 6291 bn = net_generic(net, bond_net_id); 6292 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list) 6293 unregister_netdevice_queue(bond->dev, &list); 6294 } 6295 unregister_netdevice_many(&list); 6296 rtnl_unlock(); 6297 6298 list_for_each_entry(net, net_list, exit_list) { 6299 bn = net_generic(net, bond_net_id); 6300 bond_destroy_proc_dir(bn); 6301 } 6302 } 6303 6304 static struct pernet_operations bond_net_ops = { 6305 .init = bond_net_init, 6306 .exit_batch = bond_net_exit_batch, 6307 .id = &bond_net_id, 6308 .size = sizeof(struct bond_net), 6309 }; 6310 6311 static int __init bonding_init(void) 6312 { 6313 int i; 6314 int res; 6315 6316 res = bond_check_params(&bonding_defaults); 6317 if (res) 6318 goto out; 6319 6320 res = register_pernet_subsys(&bond_net_ops); 6321 if (res) 6322 goto out; 6323 6324 res = bond_netlink_init(); 6325 if (res) 6326 goto err_link; 6327 6328 bond_create_debugfs(); 6329 6330 for (i = 0; i < max_bonds; i++) { 6331 res = bond_create(&init_net, NULL); 6332 if (res) 6333 goto err; 6334 } 6335 6336 skb_flow_dissector_init(&flow_keys_bonding, 6337 flow_keys_bonding_keys, 6338 ARRAY_SIZE(flow_keys_bonding_keys)); 6339 6340 register_netdevice_notifier(&bond_netdev_notifier); 6341 out: 6342 return res; 6343 err: 6344 bond_destroy_debugfs(); 6345 bond_netlink_fini(); 6346 err_link: 6347 unregister_pernet_subsys(&bond_net_ops); 6348 goto out; 6349 6350 } 6351 6352 static void __exit bonding_exit(void) 6353 { 6354 unregister_netdevice_notifier(&bond_netdev_notifier); 6355 6356 bond_destroy_debugfs(); 6357 6358 bond_netlink_fini(); 6359 unregister_pernet_subsys(&bond_net_ops); 6360 6361 #ifdef CONFIG_NET_POLL_CONTROLLER 6362 /* Make sure we don't have an imbalance on our netpoll blocking */ 6363 WARN_ON(atomic_read(&netpoll_block_tx)); 6364 #endif 6365 } 6366 6367 module_init(bonding_init); 6368 module_exit(bonding_exit); 6369 MODULE_LICENSE("GPL"); 6370 MODULE_DESCRIPTION(DRV_DESCRIPTION); 6371 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 6372