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 dev_mc_del(slave_dev, lacpdu_mcast_addr); 870 } 871 872 /*--------------------------- Active slave change ---------------------------*/ 873 874 /* Update the hardware address list and promisc/allmulti for the new and 875 * old active slaves (if any). Modes that are not using primary keep all 876 * slaves up date at all times; only the modes that use primary need to call 877 * this function to swap these settings during a failover. 878 */ 879 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active, 880 struct slave *old_active) 881 { 882 if (old_active) { 883 if (bond->dev->flags & IFF_PROMISC) 884 dev_set_promiscuity(old_active->dev, -1); 885 886 if (bond->dev->flags & IFF_ALLMULTI) 887 dev_set_allmulti(old_active->dev, -1); 888 889 if (bond->dev->flags & IFF_UP) 890 bond_hw_addr_flush(bond->dev, old_active->dev); 891 } 892 893 if (new_active) { 894 /* FIXME: Signal errors upstream. */ 895 if (bond->dev->flags & IFF_PROMISC) 896 dev_set_promiscuity(new_active->dev, 1); 897 898 if (bond->dev->flags & IFF_ALLMULTI) 899 dev_set_allmulti(new_active->dev, 1); 900 901 if (bond->dev->flags & IFF_UP) { 902 netif_addr_lock_bh(bond->dev); 903 dev_uc_sync(new_active->dev, bond->dev); 904 dev_mc_sync(new_active->dev, bond->dev); 905 netif_addr_unlock_bh(bond->dev); 906 } 907 } 908 } 909 910 /** 911 * bond_set_dev_addr - clone slave's address to bond 912 * @bond_dev: bond net device 913 * @slave_dev: slave net device 914 * 915 * Should be called with RTNL held. 916 */ 917 static int bond_set_dev_addr(struct net_device *bond_dev, 918 struct net_device *slave_dev) 919 { 920 int err; 921 922 slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n", 923 bond_dev, slave_dev, slave_dev->addr_len); 924 err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL); 925 if (err) 926 return err; 927 928 __dev_addr_set(bond_dev, slave_dev->dev_addr, slave_dev->addr_len); 929 bond_dev->addr_assign_type = NET_ADDR_STOLEN; 930 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev); 931 return 0; 932 } 933 934 static struct slave *bond_get_old_active(struct bonding *bond, 935 struct slave *new_active) 936 { 937 struct slave *slave; 938 struct list_head *iter; 939 940 bond_for_each_slave(bond, slave, iter) { 941 if (slave == new_active) 942 continue; 943 944 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr)) 945 return slave; 946 } 947 948 return NULL; 949 } 950 951 /* bond_do_fail_over_mac 952 * 953 * Perform special MAC address swapping for fail_over_mac settings 954 * 955 * Called with RTNL 956 */ 957 static void bond_do_fail_over_mac(struct bonding *bond, 958 struct slave *new_active, 959 struct slave *old_active) 960 { 961 u8 tmp_mac[MAX_ADDR_LEN]; 962 struct sockaddr_storage ss; 963 int rv; 964 965 switch (bond->params.fail_over_mac) { 966 case BOND_FOM_ACTIVE: 967 if (new_active) { 968 rv = bond_set_dev_addr(bond->dev, new_active->dev); 969 if (rv) 970 slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n", 971 -rv); 972 } 973 break; 974 case BOND_FOM_FOLLOW: 975 /* if new_active && old_active, swap them 976 * if just old_active, do nothing (going to no active slave) 977 * if just new_active, set new_active to bond's MAC 978 */ 979 if (!new_active) 980 return; 981 982 if (!old_active) 983 old_active = bond_get_old_active(bond, new_active); 984 985 if (old_active) { 986 bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr, 987 new_active->dev->addr_len); 988 bond_hw_addr_copy(ss.__data, 989 old_active->dev->dev_addr, 990 old_active->dev->addr_len); 991 ss.ss_family = new_active->dev->type; 992 } else { 993 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr, 994 bond->dev->addr_len); 995 ss.ss_family = bond->dev->type; 996 } 997 998 rv = dev_set_mac_address(new_active->dev, 999 (struct sockaddr *)&ss, NULL); 1000 if (rv) { 1001 slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n", 1002 -rv); 1003 goto out; 1004 } 1005 1006 if (!old_active) 1007 goto out; 1008 1009 bond_hw_addr_copy(ss.__data, tmp_mac, 1010 new_active->dev->addr_len); 1011 ss.ss_family = old_active->dev->type; 1012 1013 rv = dev_set_mac_address(old_active->dev, 1014 (struct sockaddr *)&ss, NULL); 1015 if (rv) 1016 slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n", 1017 -rv); 1018 out: 1019 break; 1020 default: 1021 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n", 1022 bond->params.fail_over_mac); 1023 break; 1024 } 1025 1026 } 1027 1028 /** 1029 * bond_choose_primary_or_current - select the primary or high priority slave 1030 * @bond: our bonding struct 1031 * 1032 * - Check if there is a primary link. If the primary link was set and is up, 1033 * go on and do link reselection. 1034 * 1035 * - If primary link is not set or down, find the highest priority link. 1036 * If the highest priority link is not current slave, set it as primary 1037 * link and do link reselection. 1038 */ 1039 static struct slave *bond_choose_primary_or_current(struct bonding *bond) 1040 { 1041 struct slave *prim = rtnl_dereference(bond->primary_slave); 1042 struct slave *curr = rtnl_dereference(bond->curr_active_slave); 1043 struct slave *slave, *hprio = NULL; 1044 struct list_head *iter; 1045 1046 if (!prim || prim->link != BOND_LINK_UP) { 1047 bond_for_each_slave(bond, slave, iter) { 1048 if (slave->link == BOND_LINK_UP) { 1049 hprio = hprio ?: slave; 1050 if (slave->prio > hprio->prio) 1051 hprio = slave; 1052 } 1053 } 1054 1055 if (hprio && hprio != curr) { 1056 prim = hprio; 1057 goto link_reselect; 1058 } 1059 1060 if (!curr || curr->link != BOND_LINK_UP) 1061 return NULL; 1062 return curr; 1063 } 1064 1065 if (bond->force_primary) { 1066 bond->force_primary = false; 1067 return prim; 1068 } 1069 1070 link_reselect: 1071 if (!curr || curr->link != BOND_LINK_UP) 1072 return prim; 1073 1074 /* At this point, prim and curr are both up */ 1075 switch (bond->params.primary_reselect) { 1076 case BOND_PRI_RESELECT_ALWAYS: 1077 return prim; 1078 case BOND_PRI_RESELECT_BETTER: 1079 if (prim->speed < curr->speed) 1080 return curr; 1081 if (prim->speed == curr->speed && prim->duplex <= curr->duplex) 1082 return curr; 1083 return prim; 1084 case BOND_PRI_RESELECT_FAILURE: 1085 return curr; 1086 default: 1087 netdev_err(bond->dev, "impossible primary_reselect %d\n", 1088 bond->params.primary_reselect); 1089 return curr; 1090 } 1091 } 1092 1093 /** 1094 * bond_find_best_slave - select the best available slave to be the active one 1095 * @bond: our bonding struct 1096 */ 1097 static struct slave *bond_find_best_slave(struct bonding *bond) 1098 { 1099 struct slave *slave, *bestslave = NULL; 1100 struct list_head *iter; 1101 int mintime = bond->params.updelay; 1102 1103 slave = bond_choose_primary_or_current(bond); 1104 if (slave) 1105 return slave; 1106 1107 bond_for_each_slave(bond, slave, iter) { 1108 if (slave->link == BOND_LINK_UP) 1109 return slave; 1110 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) && 1111 slave->delay < mintime) { 1112 mintime = slave->delay; 1113 bestslave = slave; 1114 } 1115 } 1116 1117 return bestslave; 1118 } 1119 1120 static bool bond_should_notify_peers(struct bonding *bond) 1121 { 1122 struct slave *slave; 1123 1124 rcu_read_lock(); 1125 slave = rcu_dereference(bond->curr_active_slave); 1126 rcu_read_unlock(); 1127 1128 if (!slave || !bond->send_peer_notif || 1129 bond->send_peer_notif % 1130 max(1, bond->params.peer_notif_delay) != 0 || 1131 !netif_carrier_ok(bond->dev) || 1132 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) 1133 return false; 1134 1135 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n", 1136 slave ? slave->dev->name : "NULL"); 1137 1138 return true; 1139 } 1140 1141 /** 1142 * bond_change_active_slave - change the active slave into the specified one 1143 * @bond: our bonding struct 1144 * @new_active: the new slave to make the active one 1145 * 1146 * Set the new slave to the bond's settings and unset them on the old 1147 * curr_active_slave. 1148 * Setting include flags, mc-list, promiscuity, allmulti, etc. 1149 * 1150 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, 1151 * because it is apparently the best available slave we have, even though its 1152 * updelay hasn't timed out yet. 1153 * 1154 * Caller must hold RTNL. 1155 */ 1156 void bond_change_active_slave(struct bonding *bond, struct slave *new_active) 1157 { 1158 struct slave *old_active; 1159 1160 ASSERT_RTNL(); 1161 1162 old_active = rtnl_dereference(bond->curr_active_slave); 1163 1164 if (old_active == new_active) 1165 return; 1166 1167 #ifdef CONFIG_XFRM_OFFLOAD 1168 bond_ipsec_del_sa_all(bond); 1169 #endif /* CONFIG_XFRM_OFFLOAD */ 1170 1171 if (new_active) { 1172 new_active->last_link_up = jiffies; 1173 1174 if (new_active->link == BOND_LINK_BACK) { 1175 if (bond_uses_primary(bond)) { 1176 slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n", 1177 (bond->params.updelay - new_active->delay) * bond->params.miimon); 1178 } 1179 1180 new_active->delay = 0; 1181 bond_set_slave_link_state(new_active, BOND_LINK_UP, 1182 BOND_SLAVE_NOTIFY_NOW); 1183 1184 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1185 bond_3ad_handle_link_change(new_active, BOND_LINK_UP); 1186 1187 if (bond_is_lb(bond)) 1188 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); 1189 } else { 1190 if (bond_uses_primary(bond)) 1191 slave_info(bond->dev, new_active->dev, "making interface the new active one\n"); 1192 } 1193 } 1194 1195 if (bond_uses_primary(bond)) 1196 bond_hw_addr_swap(bond, new_active, old_active); 1197 1198 if (bond_is_lb(bond)) { 1199 bond_alb_handle_active_change(bond, new_active); 1200 if (old_active) 1201 bond_set_slave_inactive_flags(old_active, 1202 BOND_SLAVE_NOTIFY_NOW); 1203 if (new_active) 1204 bond_set_slave_active_flags(new_active, 1205 BOND_SLAVE_NOTIFY_NOW); 1206 } else { 1207 rcu_assign_pointer(bond->curr_active_slave, new_active); 1208 } 1209 1210 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) { 1211 if (old_active) 1212 bond_set_slave_inactive_flags(old_active, 1213 BOND_SLAVE_NOTIFY_NOW); 1214 1215 if (new_active) { 1216 bool should_notify_peers = false; 1217 1218 bond_set_slave_active_flags(new_active, 1219 BOND_SLAVE_NOTIFY_NOW); 1220 1221 if (bond->params.fail_over_mac) 1222 bond_do_fail_over_mac(bond, new_active, 1223 old_active); 1224 1225 if (netif_running(bond->dev)) { 1226 bond->send_peer_notif = 1227 bond->params.num_peer_notif * 1228 max(1, bond->params.peer_notif_delay); 1229 should_notify_peers = 1230 bond_should_notify_peers(bond); 1231 } 1232 1233 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev); 1234 if (should_notify_peers) { 1235 bond->send_peer_notif--; 1236 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 1237 bond->dev); 1238 } 1239 } 1240 } 1241 1242 #ifdef CONFIG_XFRM_OFFLOAD 1243 bond_ipsec_add_sa_all(bond); 1244 #endif /* CONFIG_XFRM_OFFLOAD */ 1245 1246 /* resend IGMP joins since active slave has changed or 1247 * all were sent on curr_active_slave. 1248 * resend only if bond is brought up with the affected 1249 * bonding modes and the retransmission is enabled 1250 */ 1251 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && 1252 ((bond_uses_primary(bond) && new_active) || 1253 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) { 1254 bond->igmp_retrans = bond->params.resend_igmp; 1255 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 1256 } 1257 } 1258 1259 /** 1260 * bond_select_active_slave - select a new active slave, if needed 1261 * @bond: our bonding struct 1262 * 1263 * This functions should be called when one of the following occurs: 1264 * - The old curr_active_slave has been released or lost its link. 1265 * - The primary_slave has got its link back. 1266 * - A slave has got its link back and there's no old curr_active_slave. 1267 * 1268 * Caller must hold RTNL. 1269 */ 1270 void bond_select_active_slave(struct bonding *bond) 1271 { 1272 struct slave *best_slave; 1273 int rv; 1274 1275 ASSERT_RTNL(); 1276 1277 best_slave = bond_find_best_slave(bond); 1278 if (best_slave != rtnl_dereference(bond->curr_active_slave)) { 1279 bond_change_active_slave(bond, best_slave); 1280 rv = bond_set_carrier(bond); 1281 if (!rv) 1282 return; 1283 1284 if (netif_carrier_ok(bond->dev)) 1285 netdev_info(bond->dev, "active interface up!\n"); 1286 else 1287 netdev_info(bond->dev, "now running without any active interface!\n"); 1288 } 1289 } 1290 1291 #ifdef CONFIG_NET_POLL_CONTROLLER 1292 static inline int slave_enable_netpoll(struct slave *slave) 1293 { 1294 struct netpoll *np; 1295 int err = 0; 1296 1297 np = kzalloc(sizeof(*np), GFP_KERNEL); 1298 err = -ENOMEM; 1299 if (!np) 1300 goto out; 1301 1302 err = __netpoll_setup(np, slave->dev); 1303 if (err) { 1304 kfree(np); 1305 goto out; 1306 } 1307 slave->np = np; 1308 out: 1309 return err; 1310 } 1311 static inline void slave_disable_netpoll(struct slave *slave) 1312 { 1313 struct netpoll *np = slave->np; 1314 1315 if (!np) 1316 return; 1317 1318 slave->np = NULL; 1319 1320 __netpoll_free(np); 1321 } 1322 1323 static void bond_poll_controller(struct net_device *bond_dev) 1324 { 1325 struct bonding *bond = netdev_priv(bond_dev); 1326 struct slave *slave = NULL; 1327 struct list_head *iter; 1328 struct ad_info ad_info; 1329 1330 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1331 if (bond_3ad_get_active_agg_info(bond, &ad_info)) 1332 return; 1333 1334 bond_for_each_slave_rcu(bond, slave, iter) { 1335 if (!bond_slave_is_up(slave)) 1336 continue; 1337 1338 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1339 struct aggregator *agg = 1340 SLAVE_AD_INFO(slave)->port.aggregator; 1341 1342 if (agg && 1343 agg->aggregator_identifier != ad_info.aggregator_id) 1344 continue; 1345 } 1346 1347 netpoll_poll_dev(slave->dev); 1348 } 1349 } 1350 1351 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1352 { 1353 struct bonding *bond = netdev_priv(bond_dev); 1354 struct list_head *iter; 1355 struct slave *slave; 1356 1357 bond_for_each_slave(bond, slave, iter) 1358 if (bond_slave_is_up(slave)) 1359 slave_disable_netpoll(slave); 1360 } 1361 1362 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) 1363 { 1364 struct bonding *bond = netdev_priv(dev); 1365 struct list_head *iter; 1366 struct slave *slave; 1367 int err = 0; 1368 1369 bond_for_each_slave(bond, slave, iter) { 1370 err = slave_enable_netpoll(slave); 1371 if (err) { 1372 bond_netpoll_cleanup(dev); 1373 break; 1374 } 1375 } 1376 return err; 1377 } 1378 #else 1379 static inline int slave_enable_netpoll(struct slave *slave) 1380 { 1381 return 0; 1382 } 1383 static inline void slave_disable_netpoll(struct slave *slave) 1384 { 1385 } 1386 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1387 { 1388 } 1389 #endif 1390 1391 /*---------------------------------- IOCTL ----------------------------------*/ 1392 1393 static netdev_features_t bond_fix_features(struct net_device *dev, 1394 netdev_features_t features) 1395 { 1396 struct bonding *bond = netdev_priv(dev); 1397 struct list_head *iter; 1398 netdev_features_t mask; 1399 struct slave *slave; 1400 1401 #if IS_ENABLED(CONFIG_TLS_DEVICE) 1402 if (bond_sk_check(bond)) 1403 features |= BOND_TLS_FEATURES; 1404 else 1405 features &= ~BOND_TLS_FEATURES; 1406 #endif 1407 1408 mask = features; 1409 1410 features &= ~NETIF_F_ONE_FOR_ALL; 1411 features |= NETIF_F_ALL_FOR_ALL; 1412 1413 bond_for_each_slave(bond, slave, iter) { 1414 features = netdev_increment_features(features, 1415 slave->dev->features, 1416 mask); 1417 } 1418 features = netdev_add_tso_features(features, mask); 1419 1420 return features; 1421 } 1422 1423 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1424 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | \ 1425 NETIF_F_HIGHDMA | NETIF_F_LRO) 1426 1427 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1428 NETIF_F_RXCSUM | NETIF_F_GSO_SOFTWARE) 1429 1430 #define BOND_MPLS_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1431 NETIF_F_GSO_SOFTWARE) 1432 1433 1434 static void bond_compute_features(struct bonding *bond) 1435 { 1436 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE | 1437 IFF_XMIT_DST_RELEASE_PERM; 1438 netdev_features_t vlan_features = BOND_VLAN_FEATURES; 1439 netdev_features_t enc_features = BOND_ENC_FEATURES; 1440 #ifdef CONFIG_XFRM_OFFLOAD 1441 netdev_features_t xfrm_features = BOND_XFRM_FEATURES; 1442 #endif /* CONFIG_XFRM_OFFLOAD */ 1443 netdev_features_t mpls_features = BOND_MPLS_FEATURES; 1444 struct net_device *bond_dev = bond->dev; 1445 struct list_head *iter; 1446 struct slave *slave; 1447 unsigned short max_hard_header_len = ETH_HLEN; 1448 unsigned int tso_max_size = TSO_MAX_SIZE; 1449 u16 tso_max_segs = TSO_MAX_SEGS; 1450 1451 if (!bond_has_slaves(bond)) 1452 goto done; 1453 vlan_features &= NETIF_F_ALL_FOR_ALL; 1454 mpls_features &= NETIF_F_ALL_FOR_ALL; 1455 1456 bond_for_each_slave(bond, slave, iter) { 1457 vlan_features = netdev_increment_features(vlan_features, 1458 slave->dev->vlan_features, BOND_VLAN_FEATURES); 1459 1460 enc_features = netdev_increment_features(enc_features, 1461 slave->dev->hw_enc_features, 1462 BOND_ENC_FEATURES); 1463 1464 #ifdef CONFIG_XFRM_OFFLOAD 1465 xfrm_features = netdev_increment_features(xfrm_features, 1466 slave->dev->hw_enc_features, 1467 BOND_XFRM_FEATURES); 1468 #endif /* CONFIG_XFRM_OFFLOAD */ 1469 1470 mpls_features = netdev_increment_features(mpls_features, 1471 slave->dev->mpls_features, 1472 BOND_MPLS_FEATURES); 1473 1474 dst_release_flag &= slave->dev->priv_flags; 1475 if (slave->dev->hard_header_len > max_hard_header_len) 1476 max_hard_header_len = slave->dev->hard_header_len; 1477 1478 tso_max_size = min(tso_max_size, slave->dev->tso_max_size); 1479 tso_max_segs = min(tso_max_segs, slave->dev->tso_max_segs); 1480 } 1481 bond_dev->hard_header_len = max_hard_header_len; 1482 1483 done: 1484 bond_dev->vlan_features = vlan_features; 1485 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL | 1486 NETIF_F_HW_VLAN_CTAG_TX | 1487 NETIF_F_HW_VLAN_STAG_TX; 1488 #ifdef CONFIG_XFRM_OFFLOAD 1489 bond_dev->hw_enc_features |= xfrm_features; 1490 #endif /* CONFIG_XFRM_OFFLOAD */ 1491 bond_dev->mpls_features = mpls_features; 1492 netif_set_tso_max_segs(bond_dev, tso_max_segs); 1493 netif_set_tso_max_size(bond_dev, tso_max_size); 1494 1495 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1496 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) && 1497 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM)) 1498 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE; 1499 1500 netdev_change_features(bond_dev); 1501 } 1502 1503 static void bond_setup_by_slave(struct net_device *bond_dev, 1504 struct net_device *slave_dev) 1505 { 1506 bond_dev->header_ops = slave_dev->header_ops; 1507 1508 bond_dev->type = slave_dev->type; 1509 bond_dev->hard_header_len = slave_dev->hard_header_len; 1510 bond_dev->needed_headroom = slave_dev->needed_headroom; 1511 bond_dev->addr_len = slave_dev->addr_len; 1512 1513 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1514 slave_dev->addr_len); 1515 } 1516 1517 /* On bonding slaves other than the currently active slave, suppress 1518 * duplicates except for alb non-mcast/bcast. 1519 */ 1520 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1521 struct slave *slave, 1522 struct bonding *bond) 1523 { 1524 if (bond_is_slave_inactive(slave)) { 1525 if (BOND_MODE(bond) == BOND_MODE_ALB && 1526 skb->pkt_type != PACKET_BROADCAST && 1527 skb->pkt_type != PACKET_MULTICAST) 1528 return false; 1529 return true; 1530 } 1531 return false; 1532 } 1533 1534 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1535 { 1536 struct sk_buff *skb = *pskb; 1537 struct slave *slave; 1538 struct bonding *bond; 1539 int (*recv_probe)(const struct sk_buff *, struct bonding *, 1540 struct slave *); 1541 int ret = RX_HANDLER_ANOTHER; 1542 1543 skb = skb_share_check(skb, GFP_ATOMIC); 1544 if (unlikely(!skb)) 1545 return RX_HANDLER_CONSUMED; 1546 1547 *pskb = skb; 1548 1549 slave = bond_slave_get_rcu(skb->dev); 1550 bond = slave->bond; 1551 1552 recv_probe = READ_ONCE(bond->recv_probe); 1553 if (recv_probe) { 1554 ret = recv_probe(skb, bond, slave); 1555 if (ret == RX_HANDLER_CONSUMED) { 1556 consume_skb(skb); 1557 return ret; 1558 } 1559 } 1560 1561 /* 1562 * For packets determined by bond_should_deliver_exact_match() call to 1563 * be suppressed we want to make an exception for link-local packets. 1564 * This is necessary for e.g. LLDP daemons to be able to monitor 1565 * inactive slave links without being forced to bind to them 1566 * explicitly. 1567 * 1568 * At the same time, packets that are passed to the bonding master 1569 * (including link-local ones) can have their originating interface 1570 * determined via PACKET_ORIGDEV socket option. 1571 */ 1572 if (bond_should_deliver_exact_match(skb, slave, bond)) { 1573 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest)) 1574 return RX_HANDLER_PASS; 1575 return RX_HANDLER_EXACT; 1576 } 1577 1578 skb->dev = bond->dev; 1579 1580 if (BOND_MODE(bond) == BOND_MODE_ALB && 1581 netif_is_bridge_port(bond->dev) && 1582 skb->pkt_type == PACKET_HOST) { 1583 1584 if (unlikely(skb_cow_head(skb, 1585 skb->data - skb_mac_header(skb)))) { 1586 kfree_skb(skb); 1587 return RX_HANDLER_CONSUMED; 1588 } 1589 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, 1590 bond->dev->addr_len); 1591 } 1592 1593 return ret; 1594 } 1595 1596 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond) 1597 { 1598 switch (BOND_MODE(bond)) { 1599 case BOND_MODE_ROUNDROBIN: 1600 return NETDEV_LAG_TX_TYPE_ROUNDROBIN; 1601 case BOND_MODE_ACTIVEBACKUP: 1602 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP; 1603 case BOND_MODE_BROADCAST: 1604 return NETDEV_LAG_TX_TYPE_BROADCAST; 1605 case BOND_MODE_XOR: 1606 case BOND_MODE_8023AD: 1607 return NETDEV_LAG_TX_TYPE_HASH; 1608 default: 1609 return NETDEV_LAG_TX_TYPE_UNKNOWN; 1610 } 1611 } 1612 1613 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond, 1614 enum netdev_lag_tx_type type) 1615 { 1616 if (type != NETDEV_LAG_TX_TYPE_HASH) 1617 return NETDEV_LAG_HASH_NONE; 1618 1619 switch (bond->params.xmit_policy) { 1620 case BOND_XMIT_POLICY_LAYER2: 1621 return NETDEV_LAG_HASH_L2; 1622 case BOND_XMIT_POLICY_LAYER34: 1623 return NETDEV_LAG_HASH_L34; 1624 case BOND_XMIT_POLICY_LAYER23: 1625 return NETDEV_LAG_HASH_L23; 1626 case BOND_XMIT_POLICY_ENCAP23: 1627 return NETDEV_LAG_HASH_E23; 1628 case BOND_XMIT_POLICY_ENCAP34: 1629 return NETDEV_LAG_HASH_E34; 1630 case BOND_XMIT_POLICY_VLAN_SRCMAC: 1631 return NETDEV_LAG_HASH_VLAN_SRCMAC; 1632 default: 1633 return NETDEV_LAG_HASH_UNKNOWN; 1634 } 1635 } 1636 1637 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave, 1638 struct netlink_ext_ack *extack) 1639 { 1640 struct netdev_lag_upper_info lag_upper_info; 1641 enum netdev_lag_tx_type type; 1642 1643 type = bond_lag_tx_type(bond); 1644 lag_upper_info.tx_type = type; 1645 lag_upper_info.hash_type = bond_lag_hash_type(bond, type); 1646 1647 return netdev_master_upper_dev_link(slave->dev, bond->dev, slave, 1648 &lag_upper_info, extack); 1649 } 1650 1651 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave) 1652 { 1653 netdev_upper_dev_unlink(slave->dev, bond->dev); 1654 slave->dev->flags &= ~IFF_SLAVE; 1655 } 1656 1657 static void slave_kobj_release(struct kobject *kobj) 1658 { 1659 struct slave *slave = to_slave(kobj); 1660 struct bonding *bond = bond_get_bond_by_slave(slave); 1661 1662 cancel_delayed_work_sync(&slave->notify_work); 1663 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1664 kfree(SLAVE_AD_INFO(slave)); 1665 1666 kfree(slave); 1667 } 1668 1669 static struct kobj_type slave_ktype = { 1670 .release = slave_kobj_release, 1671 #ifdef CONFIG_SYSFS 1672 .sysfs_ops = &slave_sysfs_ops, 1673 #endif 1674 }; 1675 1676 static int bond_kobj_init(struct slave *slave) 1677 { 1678 int err; 1679 1680 err = kobject_init_and_add(&slave->kobj, &slave_ktype, 1681 &(slave->dev->dev.kobj), "bonding_slave"); 1682 if (err) 1683 kobject_put(&slave->kobj); 1684 1685 return err; 1686 } 1687 1688 static struct slave *bond_alloc_slave(struct bonding *bond, 1689 struct net_device *slave_dev) 1690 { 1691 struct slave *slave = NULL; 1692 1693 slave = kzalloc(sizeof(*slave), GFP_KERNEL); 1694 if (!slave) 1695 return NULL; 1696 1697 slave->bond = bond; 1698 slave->dev = slave_dev; 1699 INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work); 1700 1701 if (bond_kobj_init(slave)) 1702 return NULL; 1703 1704 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1705 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info), 1706 GFP_KERNEL); 1707 if (!SLAVE_AD_INFO(slave)) { 1708 kobject_put(&slave->kobj); 1709 return NULL; 1710 } 1711 } 1712 1713 return slave; 1714 } 1715 1716 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info) 1717 { 1718 info->bond_mode = BOND_MODE(bond); 1719 info->miimon = bond->params.miimon; 1720 info->num_slaves = bond->slave_cnt; 1721 } 1722 1723 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info) 1724 { 1725 strcpy(info->slave_name, slave->dev->name); 1726 info->link = slave->link; 1727 info->state = bond_slave_state(slave); 1728 info->link_failure_count = slave->link_failure_count; 1729 } 1730 1731 static void bond_netdev_notify_work(struct work_struct *_work) 1732 { 1733 struct slave *slave = container_of(_work, struct slave, 1734 notify_work.work); 1735 1736 if (rtnl_trylock()) { 1737 struct netdev_bonding_info binfo; 1738 1739 bond_fill_ifslave(slave, &binfo.slave); 1740 bond_fill_ifbond(slave->bond, &binfo.master); 1741 netdev_bonding_info_change(slave->dev, &binfo); 1742 rtnl_unlock(); 1743 } else { 1744 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1); 1745 } 1746 } 1747 1748 void bond_queue_slave_event(struct slave *slave) 1749 { 1750 queue_delayed_work(slave->bond->wq, &slave->notify_work, 0); 1751 } 1752 1753 void bond_lower_state_changed(struct slave *slave) 1754 { 1755 struct netdev_lag_lower_state_info info; 1756 1757 info.link_up = slave->link == BOND_LINK_UP || 1758 slave->link == BOND_LINK_FAIL; 1759 info.tx_enabled = bond_is_active_slave(slave); 1760 netdev_lower_state_changed(slave->dev, &info); 1761 } 1762 1763 #define BOND_NL_ERR(bond_dev, extack, errmsg) do { \ 1764 if (extack) \ 1765 NL_SET_ERR_MSG(extack, errmsg); \ 1766 else \ 1767 netdev_err(bond_dev, "Error: %s\n", errmsg); \ 1768 } while (0) 1769 1770 #define SLAVE_NL_ERR(bond_dev, slave_dev, extack, errmsg) do { \ 1771 if (extack) \ 1772 NL_SET_ERR_MSG(extack, errmsg); \ 1773 else \ 1774 slave_err(bond_dev, slave_dev, "Error: %s\n", errmsg); \ 1775 } while (0) 1776 1777 /* enslave device <slave> to bond device <master> */ 1778 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev, 1779 struct netlink_ext_ack *extack) 1780 { 1781 struct bonding *bond = netdev_priv(bond_dev); 1782 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1783 struct slave *new_slave = NULL, *prev_slave; 1784 struct sockaddr_storage ss; 1785 int link_reporting; 1786 int res = 0, i; 1787 1788 if (slave_dev->flags & IFF_MASTER && 1789 !netif_is_bond_master(slave_dev)) { 1790 BOND_NL_ERR(bond_dev, extack, 1791 "Device type (master device) cannot be enslaved"); 1792 return -EPERM; 1793 } 1794 1795 if (!bond->params.use_carrier && 1796 slave_dev->ethtool_ops->get_link == NULL && 1797 slave_ops->ndo_eth_ioctl == NULL) { 1798 slave_warn(bond_dev, slave_dev, "no link monitoring support\n"); 1799 } 1800 1801 /* already in-use? */ 1802 if (netdev_is_rx_handler_busy(slave_dev)) { 1803 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1804 "Device is in use and cannot be enslaved"); 1805 return -EBUSY; 1806 } 1807 1808 if (bond_dev == slave_dev) { 1809 BOND_NL_ERR(bond_dev, extack, "Cannot enslave bond to itself."); 1810 return -EPERM; 1811 } 1812 1813 /* vlan challenged mutual exclusion */ 1814 /* no need to lock since we're protected by rtnl_lock */ 1815 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1816 slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n"); 1817 if (vlan_uses_dev(bond_dev)) { 1818 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1819 "Can not enslave VLAN challenged device to VLAN enabled bond"); 1820 return -EPERM; 1821 } else { 1822 slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n"); 1823 } 1824 } else { 1825 slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n"); 1826 } 1827 1828 if (slave_dev->features & NETIF_F_HW_ESP) 1829 slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n"); 1830 1831 /* Old ifenslave binaries are no longer supported. These can 1832 * be identified with moderate accuracy by the state of the slave: 1833 * the current ifenslave will set the interface down prior to 1834 * enslaving it; the old ifenslave will not. 1835 */ 1836 if (slave_dev->flags & IFF_UP) { 1837 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1838 "Device can not be enslaved while up"); 1839 return -EPERM; 1840 } 1841 1842 /* set bonding device ether type by slave - bonding netdevices are 1843 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1844 * there is a need to override some of the type dependent attribs/funcs. 1845 * 1846 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1847 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1848 */ 1849 if (!bond_has_slaves(bond)) { 1850 if (bond_dev->type != slave_dev->type) { 1851 slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n", 1852 bond_dev->type, slave_dev->type); 1853 1854 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, 1855 bond_dev); 1856 res = notifier_to_errno(res); 1857 if (res) { 1858 slave_err(bond_dev, slave_dev, "refused to change device type\n"); 1859 return -EBUSY; 1860 } 1861 1862 /* Flush unicast and multicast addresses */ 1863 dev_uc_flush(bond_dev); 1864 dev_mc_flush(bond_dev); 1865 1866 if (slave_dev->type != ARPHRD_ETHER) 1867 bond_setup_by_slave(bond_dev, slave_dev); 1868 else { 1869 ether_setup(bond_dev); 1870 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1871 } 1872 1873 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, 1874 bond_dev); 1875 } 1876 } else if (bond_dev->type != slave_dev->type) { 1877 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1878 "Device type is different from other slaves"); 1879 return -EINVAL; 1880 } 1881 1882 if (slave_dev->type == ARPHRD_INFINIBAND && 1883 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1884 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1885 "Only active-backup mode is supported for infiniband slaves"); 1886 res = -EOPNOTSUPP; 1887 goto err_undo_flags; 1888 } 1889 1890 if (!slave_ops->ndo_set_mac_address || 1891 slave_dev->type == ARPHRD_INFINIBAND) { 1892 slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n"); 1893 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP && 1894 bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1895 if (!bond_has_slaves(bond)) { 1896 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1897 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n"); 1898 } else { 1899 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1900 "Slave device does not support setting the MAC address, but fail_over_mac is not set to active"); 1901 res = -EOPNOTSUPP; 1902 goto err_undo_flags; 1903 } 1904 } 1905 } 1906 1907 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1908 1909 /* If this is the first slave, then we need to set the master's hardware 1910 * address to be the same as the slave's. 1911 */ 1912 if (!bond_has_slaves(bond) && 1913 bond->dev->addr_assign_type == NET_ADDR_RANDOM) { 1914 res = bond_set_dev_addr(bond->dev, slave_dev); 1915 if (res) 1916 goto err_undo_flags; 1917 } 1918 1919 new_slave = bond_alloc_slave(bond, slave_dev); 1920 if (!new_slave) { 1921 res = -ENOMEM; 1922 goto err_undo_flags; 1923 } 1924 1925 /* Set the new_slave's queue_id to be zero. Queue ID mapping 1926 * is set via sysfs or module option if desired. 1927 */ 1928 new_slave->queue_id = 0; 1929 1930 /* Save slave's original mtu and then set it to match the bond */ 1931 new_slave->original_mtu = slave_dev->mtu; 1932 res = dev_set_mtu(slave_dev, bond->dev->mtu); 1933 if (res) { 1934 slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res); 1935 goto err_free; 1936 } 1937 1938 /* Save slave's original ("permanent") mac address for modes 1939 * that need it, and for restoring it upon release, and then 1940 * set it to the master's address 1941 */ 1942 bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr, 1943 slave_dev->addr_len); 1944 1945 if (!bond->params.fail_over_mac || 1946 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1947 /* Set slave to master's mac address. The application already 1948 * set the master's mac address to that of the first slave 1949 */ 1950 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 1951 ss.ss_family = slave_dev->type; 1952 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, 1953 extack); 1954 if (res) { 1955 slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res); 1956 goto err_restore_mtu; 1957 } 1958 } 1959 1960 /* set slave flag before open to prevent IPv6 addrconf */ 1961 slave_dev->flags |= IFF_SLAVE; 1962 1963 /* open the slave since the application closed it */ 1964 res = dev_open(slave_dev, extack); 1965 if (res) { 1966 slave_err(bond_dev, slave_dev, "Opening slave failed\n"); 1967 goto err_restore_mac; 1968 } 1969 1970 slave_dev->priv_flags |= IFF_BONDING; 1971 /* initialize slave stats */ 1972 dev_get_stats(new_slave->dev, &new_slave->slave_stats); 1973 1974 if (bond_is_lb(bond)) { 1975 /* bond_alb_init_slave() must be called before all other stages since 1976 * it might fail and we do not want to have to undo everything 1977 */ 1978 res = bond_alb_init_slave(bond, new_slave); 1979 if (res) 1980 goto err_close; 1981 } 1982 1983 res = vlan_vids_add_by_dev(slave_dev, bond_dev); 1984 if (res) { 1985 slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n"); 1986 goto err_close; 1987 } 1988 1989 prev_slave = bond_last_slave(bond); 1990 1991 new_slave->delay = 0; 1992 new_slave->link_failure_count = 0; 1993 1994 if (bond_update_speed_duplex(new_slave) && 1995 bond_needs_speed_duplex(bond)) 1996 new_slave->link = BOND_LINK_DOWN; 1997 1998 new_slave->last_rx = jiffies - 1999 (msecs_to_jiffies(bond->params.arp_interval) + 1); 2000 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) 2001 new_slave->target_last_arp_rx[i] = new_slave->last_rx; 2002 2003 new_slave->last_tx = new_slave->last_rx; 2004 2005 if (bond->params.miimon && !bond->params.use_carrier) { 2006 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 2007 2008 if ((link_reporting == -1) && !bond->params.arp_interval) { 2009 /* miimon is set but a bonded network driver 2010 * does not support ETHTOOL/MII and 2011 * arp_interval is not set. Note: if 2012 * use_carrier is enabled, we will never go 2013 * here (because netif_carrier is always 2014 * supported); thus, we don't need to change 2015 * the messages for netif_carrier. 2016 */ 2017 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"); 2018 } else if (link_reporting == -1) { 2019 /* unable get link status using mii/ethtool */ 2020 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"); 2021 } 2022 } 2023 2024 /* check for initial state */ 2025 new_slave->link = BOND_LINK_NOCHANGE; 2026 if (bond->params.miimon) { 2027 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { 2028 if (bond->params.updelay) { 2029 bond_set_slave_link_state(new_slave, 2030 BOND_LINK_BACK, 2031 BOND_SLAVE_NOTIFY_NOW); 2032 new_slave->delay = bond->params.updelay; 2033 } else { 2034 bond_set_slave_link_state(new_slave, 2035 BOND_LINK_UP, 2036 BOND_SLAVE_NOTIFY_NOW); 2037 } 2038 } else { 2039 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN, 2040 BOND_SLAVE_NOTIFY_NOW); 2041 } 2042 } else if (bond->params.arp_interval) { 2043 bond_set_slave_link_state(new_slave, 2044 (netif_carrier_ok(slave_dev) ? 2045 BOND_LINK_UP : BOND_LINK_DOWN), 2046 BOND_SLAVE_NOTIFY_NOW); 2047 } else { 2048 bond_set_slave_link_state(new_slave, BOND_LINK_UP, 2049 BOND_SLAVE_NOTIFY_NOW); 2050 } 2051 2052 if (new_slave->link != BOND_LINK_DOWN) 2053 new_slave->last_link_up = jiffies; 2054 slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n", 2055 new_slave->link == BOND_LINK_DOWN ? "DOWN" : 2056 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); 2057 2058 if (bond_uses_primary(bond) && bond->params.primary[0]) { 2059 /* if there is a primary slave, remember it */ 2060 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 2061 rcu_assign_pointer(bond->primary_slave, new_slave); 2062 bond->force_primary = true; 2063 } 2064 } 2065 2066 switch (BOND_MODE(bond)) { 2067 case BOND_MODE_ACTIVEBACKUP: 2068 bond_set_slave_inactive_flags(new_slave, 2069 BOND_SLAVE_NOTIFY_NOW); 2070 break; 2071 case BOND_MODE_8023AD: 2072 /* in 802.3ad mode, the internal mechanism 2073 * will activate the slaves in the selected 2074 * aggregator 2075 */ 2076 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 2077 /* if this is the first slave */ 2078 if (!prev_slave) { 2079 SLAVE_AD_INFO(new_slave)->id = 1; 2080 /* Initialize AD with the number of times that the AD timer is called in 1 second 2081 * can be called only after the mac address of the bond is set 2082 */ 2083 bond_3ad_initialize(bond); 2084 } else { 2085 SLAVE_AD_INFO(new_slave)->id = 2086 SLAVE_AD_INFO(prev_slave)->id + 1; 2087 } 2088 2089 bond_3ad_bind_slave(new_slave); 2090 break; 2091 case BOND_MODE_TLB: 2092 case BOND_MODE_ALB: 2093 bond_set_active_slave(new_slave); 2094 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 2095 break; 2096 default: 2097 slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n"); 2098 2099 /* always active in trunk mode */ 2100 bond_set_active_slave(new_slave); 2101 2102 /* In trunking mode there is little meaning to curr_active_slave 2103 * anyway (it holds no special properties of the bond device), 2104 * so we can change it without calling change_active_interface() 2105 */ 2106 if (!rcu_access_pointer(bond->curr_active_slave) && 2107 new_slave->link == BOND_LINK_UP) 2108 rcu_assign_pointer(bond->curr_active_slave, new_slave); 2109 2110 break; 2111 } /* switch(bond_mode) */ 2112 2113 #ifdef CONFIG_NET_POLL_CONTROLLER 2114 if (bond->dev->npinfo) { 2115 if (slave_enable_netpoll(new_slave)) { 2116 slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n"); 2117 res = -EBUSY; 2118 goto err_detach; 2119 } 2120 } 2121 #endif 2122 2123 if (!(bond_dev->features & NETIF_F_LRO)) 2124 dev_disable_lro(slave_dev); 2125 2126 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 2127 new_slave); 2128 if (res) { 2129 slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res); 2130 goto err_detach; 2131 } 2132 2133 res = bond_master_upper_dev_link(bond, new_slave, extack); 2134 if (res) { 2135 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res); 2136 goto err_unregister; 2137 } 2138 2139 bond_lower_state_changed(new_slave); 2140 2141 res = bond_sysfs_slave_add(new_slave); 2142 if (res) { 2143 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res); 2144 goto err_upper_unlink; 2145 } 2146 2147 /* If the mode uses primary, then the following is handled by 2148 * bond_change_active_slave(). 2149 */ 2150 if (!bond_uses_primary(bond)) { 2151 /* set promiscuity level to new slave */ 2152 if (bond_dev->flags & IFF_PROMISC) { 2153 res = dev_set_promiscuity(slave_dev, 1); 2154 if (res) 2155 goto err_sysfs_del; 2156 } 2157 2158 /* set allmulti level to new slave */ 2159 if (bond_dev->flags & IFF_ALLMULTI) { 2160 res = dev_set_allmulti(slave_dev, 1); 2161 if (res) { 2162 if (bond_dev->flags & IFF_PROMISC) 2163 dev_set_promiscuity(slave_dev, -1); 2164 goto err_sysfs_del; 2165 } 2166 } 2167 2168 if (bond_dev->flags & IFF_UP) { 2169 netif_addr_lock_bh(bond_dev); 2170 dev_mc_sync_multiple(slave_dev, bond_dev); 2171 dev_uc_sync_multiple(slave_dev, bond_dev); 2172 netif_addr_unlock_bh(bond_dev); 2173 2174 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2175 dev_mc_add(slave_dev, lacpdu_mcast_addr); 2176 } 2177 } 2178 2179 bond->slave_cnt++; 2180 bond_compute_features(bond); 2181 bond_set_carrier(bond); 2182 2183 if (bond_uses_primary(bond)) { 2184 block_netpoll_tx(); 2185 bond_select_active_slave(bond); 2186 unblock_netpoll_tx(); 2187 } 2188 2189 if (bond_mode_can_use_xmit_hash(bond)) 2190 bond_update_slave_arr(bond, NULL); 2191 2192 2193 if (!slave_dev->netdev_ops->ndo_bpf || 2194 !slave_dev->netdev_ops->ndo_xdp_xmit) { 2195 if (bond->xdp_prog) { 2196 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 2197 "Slave does not support XDP"); 2198 res = -EOPNOTSUPP; 2199 goto err_sysfs_del; 2200 } 2201 } else if (bond->xdp_prog) { 2202 struct netdev_bpf xdp = { 2203 .command = XDP_SETUP_PROG, 2204 .flags = 0, 2205 .prog = bond->xdp_prog, 2206 .extack = extack, 2207 }; 2208 2209 if (dev_xdp_prog_count(slave_dev) > 0) { 2210 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 2211 "Slave has XDP program loaded, please unload before enslaving"); 2212 res = -EOPNOTSUPP; 2213 goto err_sysfs_del; 2214 } 2215 2216 res = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 2217 if (res < 0) { 2218 /* ndo_bpf() sets extack error message */ 2219 slave_dbg(bond_dev, slave_dev, "Error %d calling ndo_bpf\n", res); 2220 goto err_sysfs_del; 2221 } 2222 if (bond->xdp_prog) 2223 bpf_prog_inc(bond->xdp_prog); 2224 } 2225 2226 slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n", 2227 bond_is_active_slave(new_slave) ? "an active" : "a backup", 2228 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down"); 2229 2230 /* enslave is successful */ 2231 bond_queue_slave_event(new_slave); 2232 return 0; 2233 2234 /* Undo stages on error */ 2235 err_sysfs_del: 2236 bond_sysfs_slave_del(new_slave); 2237 2238 err_upper_unlink: 2239 bond_upper_dev_unlink(bond, new_slave); 2240 2241 err_unregister: 2242 netdev_rx_handler_unregister(slave_dev); 2243 2244 err_detach: 2245 vlan_vids_del_by_dev(slave_dev, bond_dev); 2246 if (rcu_access_pointer(bond->primary_slave) == new_slave) 2247 RCU_INIT_POINTER(bond->primary_slave, NULL); 2248 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) { 2249 block_netpoll_tx(); 2250 bond_change_active_slave(bond, NULL); 2251 bond_select_active_slave(bond); 2252 unblock_netpoll_tx(); 2253 } 2254 /* either primary_slave or curr_active_slave might've changed */ 2255 synchronize_rcu(); 2256 slave_disable_netpoll(new_slave); 2257 2258 err_close: 2259 if (!netif_is_bond_master(slave_dev)) 2260 slave_dev->priv_flags &= ~IFF_BONDING; 2261 dev_close(slave_dev); 2262 2263 err_restore_mac: 2264 slave_dev->flags &= ~IFF_SLAVE; 2265 if (!bond->params.fail_over_mac || 2266 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2267 /* XXX TODO - fom follow mode needs to change master's 2268 * MAC if this slave's MAC is in use by the bond, or at 2269 * least print a warning. 2270 */ 2271 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr, 2272 new_slave->dev->addr_len); 2273 ss.ss_family = slave_dev->type; 2274 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL); 2275 } 2276 2277 err_restore_mtu: 2278 dev_set_mtu(slave_dev, new_slave->original_mtu); 2279 2280 err_free: 2281 kobject_put(&new_slave->kobj); 2282 2283 err_undo_flags: 2284 /* Enslave of first slave has failed and we need to fix master's mac */ 2285 if (!bond_has_slaves(bond)) { 2286 if (ether_addr_equal_64bits(bond_dev->dev_addr, 2287 slave_dev->dev_addr)) 2288 eth_hw_addr_random(bond_dev); 2289 if (bond_dev->type != ARPHRD_ETHER) { 2290 dev_close(bond_dev); 2291 ether_setup(bond_dev); 2292 bond_dev->flags |= IFF_MASTER; 2293 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 2294 } 2295 } 2296 2297 return res; 2298 } 2299 2300 /* Try to release the slave device <slave> from the bond device <master> 2301 * It is legal to access curr_active_slave without a lock because all the function 2302 * is RTNL-locked. If "all" is true it means that the function is being called 2303 * while destroying a bond interface and all slaves are being released. 2304 * 2305 * The rules for slave state should be: 2306 * for Active/Backup: 2307 * Active stays on all backups go down 2308 * for Bonded connections: 2309 * The first up interface should be left on and all others downed. 2310 */ 2311 static int __bond_release_one(struct net_device *bond_dev, 2312 struct net_device *slave_dev, 2313 bool all, bool unregister) 2314 { 2315 struct bonding *bond = netdev_priv(bond_dev); 2316 struct slave *slave, *oldcurrent; 2317 struct sockaddr_storage ss; 2318 int old_flags = bond_dev->flags; 2319 netdev_features_t old_features = bond_dev->features; 2320 2321 /* slave is not a slave or master is not master of this slave */ 2322 if (!(slave_dev->flags & IFF_SLAVE) || 2323 !netdev_has_upper_dev(slave_dev, bond_dev)) { 2324 slave_dbg(bond_dev, slave_dev, "cannot release slave\n"); 2325 return -EINVAL; 2326 } 2327 2328 block_netpoll_tx(); 2329 2330 slave = bond_get_slave_by_dev(bond, slave_dev); 2331 if (!slave) { 2332 /* not a slave of this bond */ 2333 slave_info(bond_dev, slave_dev, "interface not enslaved\n"); 2334 unblock_netpoll_tx(); 2335 return -EINVAL; 2336 } 2337 2338 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW); 2339 2340 bond_sysfs_slave_del(slave); 2341 2342 /* recompute stats just before removing the slave */ 2343 bond_get_stats(bond->dev, &bond->bond_stats); 2344 2345 if (bond->xdp_prog) { 2346 struct netdev_bpf xdp = { 2347 .command = XDP_SETUP_PROG, 2348 .flags = 0, 2349 .prog = NULL, 2350 .extack = NULL, 2351 }; 2352 if (slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp)) 2353 slave_warn(bond_dev, slave_dev, "failed to unload XDP program\n"); 2354 } 2355 2356 /* unregister rx_handler early so bond_handle_frame wouldn't be called 2357 * for this slave anymore. 2358 */ 2359 netdev_rx_handler_unregister(slave_dev); 2360 2361 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2362 bond_3ad_unbind_slave(slave); 2363 2364 bond_upper_dev_unlink(bond, slave); 2365 2366 if (bond_mode_can_use_xmit_hash(bond)) 2367 bond_update_slave_arr(bond, slave); 2368 2369 slave_info(bond_dev, slave_dev, "Releasing %s interface\n", 2370 bond_is_active_slave(slave) ? "active" : "backup"); 2371 2372 oldcurrent = rcu_access_pointer(bond->curr_active_slave); 2373 2374 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2375 2376 if (!all && (!bond->params.fail_over_mac || 2377 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) { 2378 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) && 2379 bond_has_slaves(bond)) 2380 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", 2381 slave->perm_hwaddr); 2382 } 2383 2384 if (rtnl_dereference(bond->primary_slave) == slave) 2385 RCU_INIT_POINTER(bond->primary_slave, NULL); 2386 2387 if (oldcurrent == slave) 2388 bond_change_active_slave(bond, NULL); 2389 2390 if (bond_is_lb(bond)) { 2391 /* Must be called only after the slave has been 2392 * detached from the list and the curr_active_slave 2393 * has been cleared (if our_slave == old_current), 2394 * but before a new active slave is selected. 2395 */ 2396 bond_alb_deinit_slave(bond, slave); 2397 } 2398 2399 if (all) { 2400 RCU_INIT_POINTER(bond->curr_active_slave, NULL); 2401 } else if (oldcurrent == slave) { 2402 /* Note that we hold RTNL over this sequence, so there 2403 * is no concern that another slave add/remove event 2404 * will interfere. 2405 */ 2406 bond_select_active_slave(bond); 2407 } 2408 2409 bond_set_carrier(bond); 2410 if (!bond_has_slaves(bond)) 2411 eth_hw_addr_random(bond_dev); 2412 2413 unblock_netpoll_tx(); 2414 synchronize_rcu(); 2415 bond->slave_cnt--; 2416 2417 if (!bond_has_slaves(bond)) { 2418 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 2419 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev); 2420 } 2421 2422 bond_compute_features(bond); 2423 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 2424 (old_features & NETIF_F_VLAN_CHALLENGED)) 2425 slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n"); 2426 2427 vlan_vids_del_by_dev(slave_dev, bond_dev); 2428 2429 /* If the mode uses primary, then this case was handled above by 2430 * bond_change_active_slave(..., NULL) 2431 */ 2432 if (!bond_uses_primary(bond)) { 2433 /* unset promiscuity level from slave 2434 * NOTE: The NETDEV_CHANGEADDR call above may change the value 2435 * of the IFF_PROMISC flag in the bond_dev, but we need the 2436 * value of that flag before that change, as that was the value 2437 * when this slave was attached, so we cache at the start of the 2438 * function and use it here. Same goes for ALLMULTI below 2439 */ 2440 if (old_flags & IFF_PROMISC) 2441 dev_set_promiscuity(slave_dev, -1); 2442 2443 /* unset allmulti level from slave */ 2444 if (old_flags & IFF_ALLMULTI) 2445 dev_set_allmulti(slave_dev, -1); 2446 2447 if (old_flags & IFF_UP) 2448 bond_hw_addr_flush(bond_dev, slave_dev); 2449 } 2450 2451 slave_disable_netpoll(slave); 2452 2453 /* close slave before restoring its mac address */ 2454 dev_close(slave_dev); 2455 2456 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE || 2457 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2458 /* restore original ("permanent") mac address */ 2459 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr, 2460 slave->dev->addr_len); 2461 ss.ss_family = slave_dev->type; 2462 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL); 2463 } 2464 2465 if (unregister) 2466 __dev_set_mtu(slave_dev, slave->original_mtu); 2467 else 2468 dev_set_mtu(slave_dev, slave->original_mtu); 2469 2470 if (!netif_is_bond_master(slave_dev)) 2471 slave_dev->priv_flags &= ~IFF_BONDING; 2472 2473 kobject_put(&slave->kobj); 2474 2475 return 0; 2476 } 2477 2478 /* A wrapper used because of ndo_del_link */ 2479 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 2480 { 2481 return __bond_release_one(bond_dev, slave_dev, false, false); 2482 } 2483 2484 /* First release a slave and then destroy the bond if no more slaves are left. 2485 * Must be under rtnl_lock when this function is called. 2486 */ 2487 static int bond_release_and_destroy(struct net_device *bond_dev, 2488 struct net_device *slave_dev) 2489 { 2490 struct bonding *bond = netdev_priv(bond_dev); 2491 int ret; 2492 2493 ret = __bond_release_one(bond_dev, slave_dev, false, true); 2494 if (ret == 0 && !bond_has_slaves(bond) && 2495 bond_dev->reg_state != NETREG_UNREGISTERING) { 2496 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 2497 netdev_info(bond_dev, "Destroying bond\n"); 2498 bond_remove_proc_entry(bond); 2499 unregister_netdevice(bond_dev); 2500 } 2501 return ret; 2502 } 2503 2504 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info) 2505 { 2506 struct bonding *bond = netdev_priv(bond_dev); 2507 2508 bond_fill_ifbond(bond, info); 2509 } 2510 2511 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 2512 { 2513 struct bonding *bond = netdev_priv(bond_dev); 2514 struct list_head *iter; 2515 int i = 0, res = -ENODEV; 2516 struct slave *slave; 2517 2518 bond_for_each_slave(bond, slave, iter) { 2519 if (i++ == (int)info->slave_id) { 2520 res = 0; 2521 bond_fill_ifslave(slave, info); 2522 break; 2523 } 2524 } 2525 2526 return res; 2527 } 2528 2529 /*-------------------------------- Monitoring -------------------------------*/ 2530 2531 /* called with rcu_read_lock() */ 2532 static int bond_miimon_inspect(struct bonding *bond) 2533 { 2534 int link_state, commit = 0; 2535 struct list_head *iter; 2536 struct slave *slave; 2537 bool ignore_updelay; 2538 2539 ignore_updelay = !rcu_dereference(bond->curr_active_slave); 2540 2541 bond_for_each_slave_rcu(bond, slave, iter) { 2542 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 2543 2544 link_state = bond_check_dev_link(bond, slave->dev, 0); 2545 2546 switch (slave->link) { 2547 case BOND_LINK_UP: 2548 if (link_state) 2549 continue; 2550 2551 bond_propose_link_state(slave, BOND_LINK_FAIL); 2552 commit++; 2553 slave->delay = bond->params.downdelay; 2554 if (slave->delay) { 2555 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n", 2556 (BOND_MODE(bond) == 2557 BOND_MODE_ACTIVEBACKUP) ? 2558 (bond_is_active_slave(slave) ? 2559 "active " : "backup ") : "", 2560 bond->params.downdelay * bond->params.miimon); 2561 } 2562 fallthrough; 2563 case BOND_LINK_FAIL: 2564 if (link_state) { 2565 /* recovered before downdelay expired */ 2566 bond_propose_link_state(slave, BOND_LINK_UP); 2567 slave->last_link_up = jiffies; 2568 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n", 2569 (bond->params.downdelay - slave->delay) * 2570 bond->params.miimon); 2571 commit++; 2572 continue; 2573 } 2574 2575 if (slave->delay <= 0) { 2576 bond_propose_link_state(slave, BOND_LINK_DOWN); 2577 commit++; 2578 continue; 2579 } 2580 2581 slave->delay--; 2582 break; 2583 2584 case BOND_LINK_DOWN: 2585 if (!link_state) 2586 continue; 2587 2588 bond_propose_link_state(slave, BOND_LINK_BACK); 2589 commit++; 2590 slave->delay = bond->params.updelay; 2591 2592 if (slave->delay) { 2593 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n", 2594 ignore_updelay ? 0 : 2595 bond->params.updelay * 2596 bond->params.miimon); 2597 } 2598 fallthrough; 2599 case BOND_LINK_BACK: 2600 if (!link_state) { 2601 bond_propose_link_state(slave, BOND_LINK_DOWN); 2602 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n", 2603 (bond->params.updelay - slave->delay) * 2604 bond->params.miimon); 2605 commit++; 2606 continue; 2607 } 2608 2609 if (ignore_updelay) 2610 slave->delay = 0; 2611 2612 if (slave->delay <= 0) { 2613 bond_propose_link_state(slave, BOND_LINK_UP); 2614 commit++; 2615 ignore_updelay = false; 2616 continue; 2617 } 2618 2619 slave->delay--; 2620 break; 2621 } 2622 } 2623 2624 return commit; 2625 } 2626 2627 static void bond_miimon_link_change(struct bonding *bond, 2628 struct slave *slave, 2629 char link) 2630 { 2631 switch (BOND_MODE(bond)) { 2632 case BOND_MODE_8023AD: 2633 bond_3ad_handle_link_change(slave, link); 2634 break; 2635 case BOND_MODE_TLB: 2636 case BOND_MODE_ALB: 2637 bond_alb_handle_link_change(bond, slave, link); 2638 break; 2639 case BOND_MODE_XOR: 2640 bond_update_slave_arr(bond, NULL); 2641 break; 2642 } 2643 } 2644 2645 static void bond_miimon_commit(struct bonding *bond) 2646 { 2647 struct list_head *iter; 2648 struct slave *slave, *primary; 2649 2650 bond_for_each_slave(bond, slave, iter) { 2651 switch (slave->link_new_state) { 2652 case BOND_LINK_NOCHANGE: 2653 /* For 802.3ad mode, check current slave speed and 2654 * duplex again in case its port was disabled after 2655 * invalid speed/duplex reporting but recovered before 2656 * link monitoring could make a decision on the actual 2657 * link status 2658 */ 2659 if (BOND_MODE(bond) == BOND_MODE_8023AD && 2660 slave->link == BOND_LINK_UP) 2661 bond_3ad_adapter_speed_duplex_changed(slave); 2662 continue; 2663 2664 case BOND_LINK_UP: 2665 if (bond_update_speed_duplex(slave) && 2666 bond_needs_speed_duplex(bond)) { 2667 slave->link = BOND_LINK_DOWN; 2668 if (net_ratelimit()) 2669 slave_warn(bond->dev, slave->dev, 2670 "failed to get link speed/duplex\n"); 2671 continue; 2672 } 2673 bond_set_slave_link_state(slave, BOND_LINK_UP, 2674 BOND_SLAVE_NOTIFY_NOW); 2675 slave->last_link_up = jiffies; 2676 2677 primary = rtnl_dereference(bond->primary_slave); 2678 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 2679 /* prevent it from being the active one */ 2680 bond_set_backup_slave(slave); 2681 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2682 /* make it immediately active */ 2683 bond_set_active_slave(slave); 2684 } 2685 2686 slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n", 2687 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed, 2688 slave->duplex ? "full" : "half"); 2689 2690 bond_miimon_link_change(bond, slave, BOND_LINK_UP); 2691 2692 if (!bond->curr_active_slave || slave == primary) 2693 goto do_failover; 2694 2695 continue; 2696 2697 case BOND_LINK_DOWN: 2698 if (slave->link_failure_count < UINT_MAX) 2699 slave->link_failure_count++; 2700 2701 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2702 BOND_SLAVE_NOTIFY_NOW); 2703 2704 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP || 2705 BOND_MODE(bond) == BOND_MODE_8023AD) 2706 bond_set_slave_inactive_flags(slave, 2707 BOND_SLAVE_NOTIFY_NOW); 2708 2709 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n"); 2710 2711 bond_miimon_link_change(bond, slave, BOND_LINK_DOWN); 2712 2713 if (slave == rcu_access_pointer(bond->curr_active_slave)) 2714 goto do_failover; 2715 2716 continue; 2717 2718 default: 2719 slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n", 2720 slave->link_new_state); 2721 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 2722 2723 continue; 2724 } 2725 2726 do_failover: 2727 block_netpoll_tx(); 2728 bond_select_active_slave(bond); 2729 unblock_netpoll_tx(); 2730 } 2731 2732 bond_set_carrier(bond); 2733 } 2734 2735 /* bond_mii_monitor 2736 * 2737 * Really a wrapper that splits the mii monitor into two phases: an 2738 * inspection, then (if inspection indicates something needs to be done) 2739 * an acquisition of appropriate locks followed by a commit phase to 2740 * implement whatever link state changes are indicated. 2741 */ 2742 static void bond_mii_monitor(struct work_struct *work) 2743 { 2744 struct bonding *bond = container_of(work, struct bonding, 2745 mii_work.work); 2746 bool should_notify_peers = false; 2747 bool commit; 2748 unsigned long delay; 2749 struct slave *slave; 2750 struct list_head *iter; 2751 2752 delay = msecs_to_jiffies(bond->params.miimon); 2753 2754 if (!bond_has_slaves(bond)) 2755 goto re_arm; 2756 2757 rcu_read_lock(); 2758 should_notify_peers = bond_should_notify_peers(bond); 2759 commit = !!bond_miimon_inspect(bond); 2760 if (bond->send_peer_notif) { 2761 rcu_read_unlock(); 2762 if (rtnl_trylock()) { 2763 bond->send_peer_notif--; 2764 rtnl_unlock(); 2765 } 2766 } else { 2767 rcu_read_unlock(); 2768 } 2769 2770 if (commit) { 2771 /* Race avoidance with bond_close cancel of workqueue */ 2772 if (!rtnl_trylock()) { 2773 delay = 1; 2774 should_notify_peers = false; 2775 goto re_arm; 2776 } 2777 2778 bond_for_each_slave(bond, slave, iter) { 2779 bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER); 2780 } 2781 bond_miimon_commit(bond); 2782 2783 rtnl_unlock(); /* might sleep, hold no other locks */ 2784 } 2785 2786 re_arm: 2787 if (bond->params.miimon) 2788 queue_delayed_work(bond->wq, &bond->mii_work, delay); 2789 2790 if (should_notify_peers) { 2791 if (!rtnl_trylock()) 2792 return; 2793 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); 2794 rtnl_unlock(); 2795 } 2796 } 2797 2798 static int bond_upper_dev_walk(struct net_device *upper, 2799 struct netdev_nested_priv *priv) 2800 { 2801 __be32 ip = *(__be32 *)priv->data; 2802 2803 return ip == bond_confirm_addr(upper, 0, ip); 2804 } 2805 2806 static bool bond_has_this_ip(struct bonding *bond, __be32 ip) 2807 { 2808 struct netdev_nested_priv priv = { 2809 .data = (void *)&ip, 2810 }; 2811 bool ret = false; 2812 2813 if (ip == bond_confirm_addr(bond->dev, 0, ip)) 2814 return true; 2815 2816 rcu_read_lock(); 2817 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &priv)) 2818 ret = true; 2819 rcu_read_unlock(); 2820 2821 return ret; 2822 } 2823 2824 static bool bond_handle_vlan(struct slave *slave, struct bond_vlan_tag *tags, 2825 struct sk_buff *skb) 2826 { 2827 struct net_device *bond_dev = slave->bond->dev; 2828 struct net_device *slave_dev = slave->dev; 2829 struct bond_vlan_tag *outer_tag = tags; 2830 2831 if (!tags || tags->vlan_proto == VLAN_N_VID) 2832 return true; 2833 2834 tags++; 2835 2836 /* Go through all the tags backwards and add them to the packet */ 2837 while (tags->vlan_proto != VLAN_N_VID) { 2838 if (!tags->vlan_id) { 2839 tags++; 2840 continue; 2841 } 2842 2843 slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n", 2844 ntohs(outer_tag->vlan_proto), tags->vlan_id); 2845 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto, 2846 tags->vlan_id); 2847 if (!skb) { 2848 net_err_ratelimited("failed to insert inner VLAN tag\n"); 2849 return false; 2850 } 2851 2852 tags++; 2853 } 2854 /* Set the outer tag */ 2855 if (outer_tag->vlan_id) { 2856 slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n", 2857 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id); 2858 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto, 2859 outer_tag->vlan_id); 2860 } 2861 2862 return true; 2863 } 2864 2865 /* We go to the (large) trouble of VLAN tagging ARP frames because 2866 * switches in VLAN mode (especially if ports are configured as 2867 * "native" to a VLAN) might not pass non-tagged frames. 2868 */ 2869 static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip, 2870 __be32 src_ip, struct bond_vlan_tag *tags) 2871 { 2872 struct net_device *bond_dev = slave->bond->dev; 2873 struct net_device *slave_dev = slave->dev; 2874 struct sk_buff *skb; 2875 2876 slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n", 2877 arp_op, &dest_ip, &src_ip); 2878 2879 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2880 NULL, slave_dev->dev_addr, NULL); 2881 2882 if (!skb) { 2883 net_err_ratelimited("ARP packet allocation failed\n"); 2884 return; 2885 } 2886 2887 if (bond_handle_vlan(slave, tags, skb)) { 2888 slave_update_last_tx(slave); 2889 arp_xmit(skb); 2890 } 2891 2892 return; 2893 } 2894 2895 /* Validate the device path between the @start_dev and the @end_dev. 2896 * The path is valid if the @end_dev is reachable through device 2897 * stacking. 2898 * When the path is validated, collect any vlan information in the 2899 * path. 2900 */ 2901 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev, 2902 struct net_device *end_dev, 2903 int level) 2904 { 2905 struct bond_vlan_tag *tags; 2906 struct net_device *upper; 2907 struct list_head *iter; 2908 2909 if (start_dev == end_dev) { 2910 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC); 2911 if (!tags) 2912 return ERR_PTR(-ENOMEM); 2913 tags[level].vlan_proto = VLAN_N_VID; 2914 return tags; 2915 } 2916 2917 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) { 2918 tags = bond_verify_device_path(upper, end_dev, level + 1); 2919 if (IS_ERR_OR_NULL(tags)) { 2920 if (IS_ERR(tags)) 2921 return tags; 2922 continue; 2923 } 2924 if (is_vlan_dev(upper)) { 2925 tags[level].vlan_proto = vlan_dev_vlan_proto(upper); 2926 tags[level].vlan_id = vlan_dev_vlan_id(upper); 2927 } 2928 2929 return tags; 2930 } 2931 2932 return NULL; 2933 } 2934 2935 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2936 { 2937 struct rtable *rt; 2938 struct bond_vlan_tag *tags; 2939 __be32 *targets = bond->params.arp_targets, addr; 2940 int i; 2941 2942 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) { 2943 slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n", 2944 __func__, &targets[i]); 2945 tags = NULL; 2946 2947 /* Find out through which dev should the packet go */ 2948 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 2949 RTO_ONLINK, 0); 2950 if (IS_ERR(rt)) { 2951 /* there's no route to target - try to send arp 2952 * probe to generate any traffic (arp_validate=0) 2953 */ 2954 if (bond->params.arp_validate) 2955 pr_warn_once("%s: no route to arp_ip_target %pI4 and arp_validate is set\n", 2956 bond->dev->name, 2957 &targets[i]); 2958 bond_arp_send(slave, ARPOP_REQUEST, targets[i], 2959 0, tags); 2960 continue; 2961 } 2962 2963 /* bond device itself */ 2964 if (rt->dst.dev == bond->dev) 2965 goto found; 2966 2967 rcu_read_lock(); 2968 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0); 2969 rcu_read_unlock(); 2970 2971 if (!IS_ERR_OR_NULL(tags)) 2972 goto found; 2973 2974 /* Not our device - skip */ 2975 slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n", 2976 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL"); 2977 2978 ip_rt_put(rt); 2979 continue; 2980 2981 found: 2982 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0); 2983 ip_rt_put(rt); 2984 bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags); 2985 kfree(tags); 2986 } 2987 } 2988 2989 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 2990 { 2991 int i; 2992 2993 if (!sip || !bond_has_this_ip(bond, tip)) { 2994 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n", 2995 __func__, &sip, &tip); 2996 return; 2997 } 2998 2999 i = bond_get_targets_ip(bond->params.arp_targets, sip); 3000 if (i == -1) { 3001 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n", 3002 __func__, &sip); 3003 return; 3004 } 3005 slave->last_rx = jiffies; 3006 slave->target_last_arp_rx[i] = jiffies; 3007 } 3008 3009 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, 3010 struct slave *slave) 3011 { 3012 struct arphdr *arp = (struct arphdr *)skb->data; 3013 struct slave *curr_active_slave, *curr_arp_slave; 3014 unsigned char *arp_ptr; 3015 __be32 sip, tip; 3016 unsigned int alen; 3017 3018 alen = arp_hdr_len(bond->dev); 3019 3020 if (alen > skb_headlen(skb)) { 3021 arp = kmalloc(alen, GFP_ATOMIC); 3022 if (!arp) 3023 goto out_unlock; 3024 if (skb_copy_bits(skb, 0, arp, alen) < 0) 3025 goto out_unlock; 3026 } 3027 3028 if (arp->ar_hln != bond->dev->addr_len || 3029 skb->pkt_type == PACKET_OTHERHOST || 3030 skb->pkt_type == PACKET_LOOPBACK || 3031 arp->ar_hrd != htons(ARPHRD_ETHER) || 3032 arp->ar_pro != htons(ETH_P_IP) || 3033 arp->ar_pln != 4) 3034 goto out_unlock; 3035 3036 arp_ptr = (unsigned char *)(arp + 1); 3037 arp_ptr += bond->dev->addr_len; 3038 memcpy(&sip, arp_ptr, 4); 3039 arp_ptr += 4 + bond->dev->addr_len; 3040 memcpy(&tip, arp_ptr, 4); 3041 3042 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n", 3043 __func__, slave->dev->name, bond_slave_state(slave), 3044 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 3045 &sip, &tip); 3046 3047 curr_active_slave = rcu_dereference(bond->curr_active_slave); 3048 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 3049 3050 /* We 'trust' the received ARP enough to validate it if: 3051 * 3052 * (a) the slave receiving the ARP is active (which includes the 3053 * current ARP slave, if any), or 3054 * 3055 * (b) the receiving slave isn't active, but there is a currently 3056 * active slave and it received valid arp reply(s) after it became 3057 * the currently active slave, or 3058 * 3059 * (c) there is an ARP slave that sent an ARP during the prior ARP 3060 * interval, and we receive an ARP reply on any slave. We accept 3061 * these because switch FDB update delays may deliver the ARP 3062 * reply to a slave other than the sender of the ARP request. 3063 * 3064 * Note: for (b), backup slaves are receiving the broadcast ARP 3065 * request, not a reply. This request passes from the sending 3066 * slave through the L2 switch(es) to the receiving slave. Since 3067 * this is checking the request, sip/tip are swapped for 3068 * validation. 3069 * 3070 * This is done to avoid endless looping when we can't reach the 3071 * arp_ip_target and fool ourselves with our own arp requests. 3072 */ 3073 if (bond_is_active_slave(slave)) 3074 bond_validate_arp(bond, slave, sip, tip); 3075 else if (curr_active_slave && 3076 time_after(slave_last_rx(bond, curr_active_slave), 3077 curr_active_slave->last_link_up)) 3078 bond_validate_arp(bond, slave, tip, sip); 3079 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) && 3080 bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1)) 3081 bond_validate_arp(bond, slave, sip, tip); 3082 3083 out_unlock: 3084 if (arp != (struct arphdr *)skb->data) 3085 kfree(arp); 3086 return RX_HANDLER_ANOTHER; 3087 } 3088 3089 #if IS_ENABLED(CONFIG_IPV6) 3090 static void bond_ns_send(struct slave *slave, const struct in6_addr *daddr, 3091 const struct in6_addr *saddr, struct bond_vlan_tag *tags) 3092 { 3093 struct net_device *bond_dev = slave->bond->dev; 3094 struct net_device *slave_dev = slave->dev; 3095 struct in6_addr mcaddr; 3096 struct sk_buff *skb; 3097 3098 slave_dbg(bond_dev, slave_dev, "NS on slave: dst %pI6c src %pI6c\n", 3099 daddr, saddr); 3100 3101 skb = ndisc_ns_create(slave_dev, daddr, saddr, 0); 3102 if (!skb) { 3103 net_err_ratelimited("NS packet allocation failed\n"); 3104 return; 3105 } 3106 3107 addrconf_addr_solict_mult(daddr, &mcaddr); 3108 if (bond_handle_vlan(slave, tags, skb)) { 3109 slave_update_last_tx(slave); 3110 ndisc_send_skb(skb, &mcaddr, saddr); 3111 } 3112 } 3113 3114 static void bond_ns_send_all(struct bonding *bond, struct slave *slave) 3115 { 3116 struct in6_addr *targets = bond->params.ns_targets; 3117 struct bond_vlan_tag *tags; 3118 struct dst_entry *dst; 3119 struct in6_addr saddr; 3120 struct flowi6 fl6; 3121 int i; 3122 3123 for (i = 0; i < BOND_MAX_NS_TARGETS && !ipv6_addr_any(&targets[i]); i++) { 3124 slave_dbg(bond->dev, slave->dev, "%s: target %pI6c\n", 3125 __func__, &targets[i]); 3126 tags = NULL; 3127 3128 /* Find out through which dev should the packet go */ 3129 memset(&fl6, 0, sizeof(struct flowi6)); 3130 fl6.daddr = targets[i]; 3131 fl6.flowi6_oif = bond->dev->ifindex; 3132 3133 dst = ip6_route_output(dev_net(bond->dev), NULL, &fl6); 3134 if (dst->error) { 3135 dst_release(dst); 3136 /* there's no route to target - try to send arp 3137 * probe to generate any traffic (arp_validate=0) 3138 */ 3139 if (bond->params.arp_validate) 3140 pr_warn_once("%s: no route to ns_ip6_target %pI6c and arp_validate is set\n", 3141 bond->dev->name, 3142 &targets[i]); 3143 bond_ns_send(slave, &targets[i], &in6addr_any, tags); 3144 continue; 3145 } 3146 3147 /* bond device itself */ 3148 if (dst->dev == bond->dev) 3149 goto found; 3150 3151 rcu_read_lock(); 3152 tags = bond_verify_device_path(bond->dev, dst->dev, 0); 3153 rcu_read_unlock(); 3154 3155 if (!IS_ERR_OR_NULL(tags)) 3156 goto found; 3157 3158 /* Not our device - skip */ 3159 slave_dbg(bond->dev, slave->dev, "no path to ns_ip6_target %pI6c via dst->dev %s\n", 3160 &targets[i], dst->dev ? dst->dev->name : "NULL"); 3161 3162 dst_release(dst); 3163 continue; 3164 3165 found: 3166 if (!ipv6_dev_get_saddr(dev_net(dst->dev), dst->dev, &targets[i], 0, &saddr)) 3167 bond_ns_send(slave, &targets[i], &saddr, tags); 3168 else 3169 bond_ns_send(slave, &targets[i], &in6addr_any, tags); 3170 3171 dst_release(dst); 3172 kfree(tags); 3173 } 3174 } 3175 3176 static int bond_confirm_addr6(struct net_device *dev, 3177 struct netdev_nested_priv *priv) 3178 { 3179 struct in6_addr *addr = (struct in6_addr *)priv->data; 3180 3181 return ipv6_chk_addr(dev_net(dev), addr, dev, 0); 3182 } 3183 3184 static bool bond_has_this_ip6(struct bonding *bond, struct in6_addr *addr) 3185 { 3186 struct netdev_nested_priv priv = { 3187 .data = addr, 3188 }; 3189 int ret = false; 3190 3191 if (bond_confirm_addr6(bond->dev, &priv)) 3192 return true; 3193 3194 rcu_read_lock(); 3195 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_confirm_addr6, &priv)) 3196 ret = true; 3197 rcu_read_unlock(); 3198 3199 return ret; 3200 } 3201 3202 static void bond_validate_na(struct bonding *bond, struct slave *slave, 3203 struct in6_addr *saddr, struct in6_addr *daddr) 3204 { 3205 int i; 3206 3207 /* Ignore NAs that: 3208 * 1. Source address is unspecified address. 3209 * 2. Dest address is neither all-nodes multicast address nor 3210 * exist on bond interface. 3211 */ 3212 if (ipv6_addr_any(saddr) || 3213 (!ipv6_addr_equal(daddr, &in6addr_linklocal_allnodes) && 3214 !bond_has_this_ip6(bond, daddr))) { 3215 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c tip %pI6c not found\n", 3216 __func__, saddr, daddr); 3217 return; 3218 } 3219 3220 i = bond_get_targets_ip6(bond->params.ns_targets, saddr); 3221 if (i == -1) { 3222 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c not found in targets\n", 3223 __func__, saddr); 3224 return; 3225 } 3226 slave->last_rx = jiffies; 3227 slave->target_last_arp_rx[i] = jiffies; 3228 } 3229 3230 static int bond_na_rcv(const struct sk_buff *skb, struct bonding *bond, 3231 struct slave *slave) 3232 { 3233 struct slave *curr_active_slave, *curr_arp_slave; 3234 struct icmp6hdr *hdr = icmp6_hdr(skb); 3235 struct in6_addr *saddr, *daddr; 3236 3237 if (skb->pkt_type == PACKET_OTHERHOST || 3238 skb->pkt_type == PACKET_LOOPBACK || 3239 hdr->icmp6_type != NDISC_NEIGHBOUR_ADVERTISEMENT) 3240 goto out; 3241 3242 saddr = &ipv6_hdr(skb)->saddr; 3243 daddr = &ipv6_hdr(skb)->daddr; 3244 3245 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI6c tip %pI6c\n", 3246 __func__, slave->dev->name, bond_slave_state(slave), 3247 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 3248 saddr, daddr); 3249 3250 curr_active_slave = rcu_dereference(bond->curr_active_slave); 3251 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 3252 3253 /* We 'trust' the received ARP enough to validate it if: 3254 * see bond_arp_rcv(). 3255 */ 3256 if (bond_is_active_slave(slave)) 3257 bond_validate_na(bond, slave, saddr, daddr); 3258 else if (curr_active_slave && 3259 time_after(slave_last_rx(bond, curr_active_slave), 3260 curr_active_slave->last_link_up)) 3261 bond_validate_na(bond, slave, saddr, daddr); 3262 else if (curr_arp_slave && 3263 bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1)) 3264 bond_validate_na(bond, slave, saddr, daddr); 3265 3266 out: 3267 return RX_HANDLER_ANOTHER; 3268 } 3269 #endif 3270 3271 int bond_rcv_validate(const struct sk_buff *skb, struct bonding *bond, 3272 struct slave *slave) 3273 { 3274 #if IS_ENABLED(CONFIG_IPV6) 3275 bool is_ipv6 = skb->protocol == __cpu_to_be16(ETH_P_IPV6); 3276 #endif 3277 bool is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP); 3278 3279 slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n", 3280 __func__, skb->dev->name); 3281 3282 /* Use arp validate logic for both ARP and NS */ 3283 if (!slave_do_arp_validate(bond, slave)) { 3284 if ((slave_do_arp_validate_only(bond) && is_arp) || 3285 #if IS_ENABLED(CONFIG_IPV6) 3286 (slave_do_arp_validate_only(bond) && is_ipv6) || 3287 #endif 3288 !slave_do_arp_validate_only(bond)) 3289 slave->last_rx = jiffies; 3290 return RX_HANDLER_ANOTHER; 3291 } else if (is_arp) { 3292 return bond_arp_rcv(skb, bond, slave); 3293 #if IS_ENABLED(CONFIG_IPV6) 3294 } else if (is_ipv6) { 3295 return bond_na_rcv(skb, bond, slave); 3296 #endif 3297 } else { 3298 return RX_HANDLER_ANOTHER; 3299 } 3300 } 3301 3302 static void bond_send_validate(struct bonding *bond, struct slave *slave) 3303 { 3304 bond_arp_send_all(bond, slave); 3305 #if IS_ENABLED(CONFIG_IPV6) 3306 bond_ns_send_all(bond, slave); 3307 #endif 3308 } 3309 3310 /* function to verify if we're in the arp_interval timeslice, returns true if 3311 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval + 3312 * arp_interval/2) . the arp_interval/2 is needed for really fast networks. 3313 */ 3314 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 3315 int mod) 3316 { 3317 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3318 3319 return time_in_range(jiffies, 3320 last_act - delta_in_ticks, 3321 last_act + mod * delta_in_ticks + delta_in_ticks/2); 3322 } 3323 3324 /* This function is called regularly to monitor each slave's link 3325 * ensuring that traffic is being sent and received when arp monitoring 3326 * is used in load-balancing mode. if the adapter has been dormant, then an 3327 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 3328 * arp monitoring in active backup mode. 3329 */ 3330 static void bond_loadbalance_arp_mon(struct bonding *bond) 3331 { 3332 struct slave *slave, *oldcurrent; 3333 struct list_head *iter; 3334 int do_failover = 0, slave_state_changed = 0; 3335 3336 if (!bond_has_slaves(bond)) 3337 goto re_arm; 3338 3339 rcu_read_lock(); 3340 3341 oldcurrent = rcu_dereference(bond->curr_active_slave); 3342 /* see if any of the previous devices are up now (i.e. they have 3343 * xmt and rcv traffic). the curr_active_slave does not come into 3344 * the picture unless it is null. also, slave->last_link_up is not 3345 * needed here because we send an arp on each slave and give a slave 3346 * as long as it needs to get the tx/rx within the delta. 3347 * TODO: what about up/down delay in arp mode? it wasn't here before 3348 * so it can wait 3349 */ 3350 bond_for_each_slave_rcu(bond, slave, iter) { 3351 unsigned long last_tx = slave_last_tx(slave); 3352 3353 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 3354 3355 if (slave->link != BOND_LINK_UP) { 3356 if (bond_time_in_interval(bond, last_tx, 1) && 3357 bond_time_in_interval(bond, slave->last_rx, 1)) { 3358 3359 bond_propose_link_state(slave, BOND_LINK_UP); 3360 slave_state_changed = 1; 3361 3362 /* primary_slave has no meaning in round-robin 3363 * mode. the window of a slave being up and 3364 * curr_active_slave being null after enslaving 3365 * is closed. 3366 */ 3367 if (!oldcurrent) { 3368 slave_info(bond->dev, slave->dev, "link status definitely up\n"); 3369 do_failover = 1; 3370 } else { 3371 slave_info(bond->dev, slave->dev, "interface is now up\n"); 3372 } 3373 } 3374 } else { 3375 /* slave->link == BOND_LINK_UP */ 3376 3377 /* not all switches will respond to an arp request 3378 * when the source ip is 0, so don't take the link down 3379 * if we don't know our ip yet 3380 */ 3381 if (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) || 3382 !bond_time_in_interval(bond, slave->last_rx, bond->params.missed_max)) { 3383 3384 bond_propose_link_state(slave, BOND_LINK_DOWN); 3385 slave_state_changed = 1; 3386 3387 if (slave->link_failure_count < UINT_MAX) 3388 slave->link_failure_count++; 3389 3390 slave_info(bond->dev, slave->dev, "interface is now down\n"); 3391 3392 if (slave == oldcurrent) 3393 do_failover = 1; 3394 } 3395 } 3396 3397 /* note: if switch is in round-robin mode, all links 3398 * must tx arp to ensure all links rx an arp - otherwise 3399 * links may oscillate or not come up at all; if switch is 3400 * in something like xor mode, there is nothing we can 3401 * do - all replies will be rx'ed on same link causing slaves 3402 * to be unstable during low/no traffic periods 3403 */ 3404 if (bond_slave_is_up(slave)) 3405 bond_send_validate(bond, slave); 3406 } 3407 3408 rcu_read_unlock(); 3409 3410 if (do_failover || slave_state_changed) { 3411 if (!rtnl_trylock()) 3412 goto re_arm; 3413 3414 bond_for_each_slave(bond, slave, iter) { 3415 if (slave->link_new_state != BOND_LINK_NOCHANGE) 3416 slave->link = slave->link_new_state; 3417 } 3418 3419 if (slave_state_changed) { 3420 bond_slave_state_change(bond); 3421 if (BOND_MODE(bond) == BOND_MODE_XOR) 3422 bond_update_slave_arr(bond, NULL); 3423 } 3424 if (do_failover) { 3425 block_netpoll_tx(); 3426 bond_select_active_slave(bond); 3427 unblock_netpoll_tx(); 3428 } 3429 rtnl_unlock(); 3430 } 3431 3432 re_arm: 3433 if (bond->params.arp_interval) 3434 queue_delayed_work(bond->wq, &bond->arp_work, 3435 msecs_to_jiffies(bond->params.arp_interval)); 3436 } 3437 3438 /* Called to inspect slaves for active-backup mode ARP monitor link state 3439 * changes. Sets proposed link state in slaves to specify what action 3440 * should take place for the slave. Returns 0 if no changes are found, >0 3441 * if changes to link states must be committed. 3442 * 3443 * Called with rcu_read_lock held. 3444 */ 3445 static int bond_ab_arp_inspect(struct bonding *bond) 3446 { 3447 unsigned long last_tx, last_rx; 3448 struct list_head *iter; 3449 struct slave *slave; 3450 int commit = 0; 3451 3452 bond_for_each_slave_rcu(bond, slave, iter) { 3453 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 3454 last_rx = slave_last_rx(bond, slave); 3455 3456 if (slave->link != BOND_LINK_UP) { 3457 if (bond_time_in_interval(bond, last_rx, 1)) { 3458 bond_propose_link_state(slave, BOND_LINK_UP); 3459 commit++; 3460 } else if (slave->link == BOND_LINK_BACK) { 3461 bond_propose_link_state(slave, BOND_LINK_FAIL); 3462 commit++; 3463 } 3464 continue; 3465 } 3466 3467 /* Give slaves 2*delta after being enslaved or made 3468 * active. This avoids bouncing, as the last receive 3469 * times need a full ARP monitor cycle to be updated. 3470 */ 3471 if (bond_time_in_interval(bond, slave->last_link_up, 2)) 3472 continue; 3473 3474 /* Backup slave is down if: 3475 * - No current_arp_slave AND 3476 * - more than (missed_max+1)*delta since last receive AND 3477 * - the bond has an IP address 3478 * 3479 * Note: a non-null current_arp_slave indicates 3480 * the curr_active_slave went down and we are 3481 * searching for a new one; under this condition 3482 * we only take the curr_active_slave down - this 3483 * gives each slave a chance to tx/rx traffic 3484 * before being taken out 3485 */ 3486 if (!bond_is_active_slave(slave) && 3487 !rcu_access_pointer(bond->current_arp_slave) && 3488 !bond_time_in_interval(bond, last_rx, bond->params.missed_max + 1)) { 3489 bond_propose_link_state(slave, BOND_LINK_DOWN); 3490 commit++; 3491 } 3492 3493 /* Active slave is down if: 3494 * - more than missed_max*delta since transmitting OR 3495 * - (more than missed_max*delta since receive AND 3496 * the bond has an IP address) 3497 */ 3498 last_tx = slave_last_tx(slave); 3499 if (bond_is_active_slave(slave) && 3500 (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) || 3501 !bond_time_in_interval(bond, last_rx, bond->params.missed_max))) { 3502 bond_propose_link_state(slave, BOND_LINK_DOWN); 3503 commit++; 3504 } 3505 } 3506 3507 return commit; 3508 } 3509 3510 /* Called to commit link state changes noted by inspection step of 3511 * active-backup mode ARP monitor. 3512 * 3513 * Called with RTNL hold. 3514 */ 3515 static void bond_ab_arp_commit(struct bonding *bond) 3516 { 3517 struct list_head *iter; 3518 unsigned long last_tx; 3519 struct slave *slave; 3520 3521 bond_for_each_slave(bond, slave, iter) { 3522 switch (slave->link_new_state) { 3523 case BOND_LINK_NOCHANGE: 3524 continue; 3525 3526 case BOND_LINK_UP: 3527 last_tx = slave_last_tx(slave); 3528 if (rtnl_dereference(bond->curr_active_slave) != slave || 3529 (!rtnl_dereference(bond->curr_active_slave) && 3530 bond_time_in_interval(bond, last_tx, 1))) { 3531 struct slave *current_arp_slave; 3532 3533 current_arp_slave = rtnl_dereference(bond->current_arp_slave); 3534 bond_set_slave_link_state(slave, BOND_LINK_UP, 3535 BOND_SLAVE_NOTIFY_NOW); 3536 if (current_arp_slave) { 3537 bond_set_slave_inactive_flags( 3538 current_arp_slave, 3539 BOND_SLAVE_NOTIFY_NOW); 3540 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3541 } 3542 3543 slave_info(bond->dev, slave->dev, "link status definitely up\n"); 3544 3545 if (!rtnl_dereference(bond->curr_active_slave) || 3546 slave == rtnl_dereference(bond->primary_slave)) 3547 goto do_failover; 3548 3549 } 3550 3551 continue; 3552 3553 case BOND_LINK_DOWN: 3554 if (slave->link_failure_count < UINT_MAX) 3555 slave->link_failure_count++; 3556 3557 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 3558 BOND_SLAVE_NOTIFY_NOW); 3559 bond_set_slave_inactive_flags(slave, 3560 BOND_SLAVE_NOTIFY_NOW); 3561 3562 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n"); 3563 3564 if (slave == rtnl_dereference(bond->curr_active_slave)) { 3565 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3566 goto do_failover; 3567 } 3568 3569 continue; 3570 3571 case BOND_LINK_FAIL: 3572 bond_set_slave_link_state(slave, BOND_LINK_FAIL, 3573 BOND_SLAVE_NOTIFY_NOW); 3574 bond_set_slave_inactive_flags(slave, 3575 BOND_SLAVE_NOTIFY_NOW); 3576 3577 /* A slave has just been enslaved and has become 3578 * the current active slave. 3579 */ 3580 if (rtnl_dereference(bond->curr_active_slave)) 3581 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3582 continue; 3583 3584 default: 3585 slave_err(bond->dev, slave->dev, 3586 "impossible: link_new_state %d on slave\n", 3587 slave->link_new_state); 3588 continue; 3589 } 3590 3591 do_failover: 3592 block_netpoll_tx(); 3593 bond_select_active_slave(bond); 3594 unblock_netpoll_tx(); 3595 } 3596 3597 bond_set_carrier(bond); 3598 } 3599 3600 /* Send ARP probes for active-backup mode ARP monitor. 3601 * 3602 * Called with rcu_read_lock held. 3603 */ 3604 static bool bond_ab_arp_probe(struct bonding *bond) 3605 { 3606 struct slave *slave, *before = NULL, *new_slave = NULL, 3607 *curr_arp_slave = rcu_dereference(bond->current_arp_slave), 3608 *curr_active_slave = rcu_dereference(bond->curr_active_slave); 3609 struct list_head *iter; 3610 bool found = false; 3611 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; 3612 3613 if (curr_arp_slave && curr_active_slave) 3614 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n", 3615 curr_arp_slave->dev->name, 3616 curr_active_slave->dev->name); 3617 3618 if (curr_active_slave) { 3619 bond_send_validate(bond, curr_active_slave); 3620 return should_notify_rtnl; 3621 } 3622 3623 /* if we don't have a curr_active_slave, search for the next available 3624 * backup slave from the current_arp_slave and make it the candidate 3625 * for becoming the curr_active_slave 3626 */ 3627 3628 if (!curr_arp_slave) { 3629 curr_arp_slave = bond_first_slave_rcu(bond); 3630 if (!curr_arp_slave) 3631 return should_notify_rtnl; 3632 } 3633 3634 bond_for_each_slave_rcu(bond, slave, iter) { 3635 if (!found && !before && bond_slave_is_up(slave)) 3636 before = slave; 3637 3638 if (found && !new_slave && bond_slave_is_up(slave)) 3639 new_slave = slave; 3640 /* if the link state is up at this point, we 3641 * mark it down - this can happen if we have 3642 * simultaneous link failures and 3643 * reselect_active_interface doesn't make this 3644 * one the current slave so it is still marked 3645 * up when it is actually down 3646 */ 3647 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 3648 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 3649 BOND_SLAVE_NOTIFY_LATER); 3650 if (slave->link_failure_count < UINT_MAX) 3651 slave->link_failure_count++; 3652 3653 bond_set_slave_inactive_flags(slave, 3654 BOND_SLAVE_NOTIFY_LATER); 3655 3656 slave_info(bond->dev, slave->dev, "backup interface is now down\n"); 3657 } 3658 if (slave == curr_arp_slave) 3659 found = true; 3660 } 3661 3662 if (!new_slave && before) 3663 new_slave = before; 3664 3665 if (!new_slave) 3666 goto check_state; 3667 3668 bond_set_slave_link_state(new_slave, BOND_LINK_BACK, 3669 BOND_SLAVE_NOTIFY_LATER); 3670 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER); 3671 bond_send_validate(bond, new_slave); 3672 new_slave->last_link_up = jiffies; 3673 rcu_assign_pointer(bond->current_arp_slave, new_slave); 3674 3675 check_state: 3676 bond_for_each_slave_rcu(bond, slave, iter) { 3677 if (slave->should_notify || slave->should_notify_link) { 3678 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; 3679 break; 3680 } 3681 } 3682 return should_notify_rtnl; 3683 } 3684 3685 static void bond_activebackup_arp_mon(struct bonding *bond) 3686 { 3687 bool should_notify_peers = false; 3688 bool should_notify_rtnl = false; 3689 int delta_in_ticks; 3690 3691 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3692 3693 if (!bond_has_slaves(bond)) 3694 goto re_arm; 3695 3696 rcu_read_lock(); 3697 3698 should_notify_peers = bond_should_notify_peers(bond); 3699 3700 if (bond_ab_arp_inspect(bond)) { 3701 rcu_read_unlock(); 3702 3703 /* Race avoidance with bond_close flush of workqueue */ 3704 if (!rtnl_trylock()) { 3705 delta_in_ticks = 1; 3706 should_notify_peers = false; 3707 goto re_arm; 3708 } 3709 3710 bond_ab_arp_commit(bond); 3711 3712 rtnl_unlock(); 3713 rcu_read_lock(); 3714 } 3715 3716 should_notify_rtnl = bond_ab_arp_probe(bond); 3717 rcu_read_unlock(); 3718 3719 re_arm: 3720 if (bond->params.arp_interval) 3721 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 3722 3723 if (should_notify_peers || should_notify_rtnl) { 3724 if (!rtnl_trylock()) 3725 return; 3726 3727 if (should_notify_peers) { 3728 bond->send_peer_notif--; 3729 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 3730 bond->dev); 3731 } 3732 if (should_notify_rtnl) { 3733 bond_slave_state_notify(bond); 3734 bond_slave_link_notify(bond); 3735 } 3736 3737 rtnl_unlock(); 3738 } 3739 } 3740 3741 static void bond_arp_monitor(struct work_struct *work) 3742 { 3743 struct bonding *bond = container_of(work, struct bonding, 3744 arp_work.work); 3745 3746 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3747 bond_activebackup_arp_mon(bond); 3748 else 3749 bond_loadbalance_arp_mon(bond); 3750 } 3751 3752 /*-------------------------- netdev event handling --------------------------*/ 3753 3754 /* Change device name */ 3755 static int bond_event_changename(struct bonding *bond) 3756 { 3757 bond_remove_proc_entry(bond); 3758 bond_create_proc_entry(bond); 3759 3760 bond_debug_reregister(bond); 3761 3762 return NOTIFY_DONE; 3763 } 3764 3765 static int bond_master_netdev_event(unsigned long event, 3766 struct net_device *bond_dev) 3767 { 3768 struct bonding *event_bond = netdev_priv(bond_dev); 3769 3770 netdev_dbg(bond_dev, "%s called\n", __func__); 3771 3772 switch (event) { 3773 case NETDEV_CHANGENAME: 3774 return bond_event_changename(event_bond); 3775 case NETDEV_UNREGISTER: 3776 bond_remove_proc_entry(event_bond); 3777 #ifdef CONFIG_XFRM_OFFLOAD 3778 xfrm_dev_state_flush(dev_net(bond_dev), bond_dev, true); 3779 #endif /* CONFIG_XFRM_OFFLOAD */ 3780 break; 3781 case NETDEV_REGISTER: 3782 bond_create_proc_entry(event_bond); 3783 break; 3784 default: 3785 break; 3786 } 3787 3788 return NOTIFY_DONE; 3789 } 3790 3791 static int bond_slave_netdev_event(unsigned long event, 3792 struct net_device *slave_dev) 3793 { 3794 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary; 3795 struct bonding *bond; 3796 struct net_device *bond_dev; 3797 3798 /* A netdev event can be generated while enslaving a device 3799 * before netdev_rx_handler_register is called in which case 3800 * slave will be NULL 3801 */ 3802 if (!slave) { 3803 netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__); 3804 return NOTIFY_DONE; 3805 } 3806 3807 bond_dev = slave->bond->dev; 3808 bond = slave->bond; 3809 primary = rtnl_dereference(bond->primary_slave); 3810 3811 slave_dbg(bond_dev, slave_dev, "%s called\n", __func__); 3812 3813 switch (event) { 3814 case NETDEV_UNREGISTER: 3815 if (bond_dev->type != ARPHRD_ETHER) 3816 bond_release_and_destroy(bond_dev, slave_dev); 3817 else 3818 __bond_release_one(bond_dev, slave_dev, false, true); 3819 break; 3820 case NETDEV_UP: 3821 case NETDEV_CHANGE: 3822 /* For 802.3ad mode only: 3823 * Getting invalid Speed/Duplex values here will put slave 3824 * in weird state. Mark it as link-fail if the link was 3825 * previously up or link-down if it hasn't yet come up, and 3826 * let link-monitoring (miimon) set it right when correct 3827 * speeds/duplex are available. 3828 */ 3829 if (bond_update_speed_duplex(slave) && 3830 BOND_MODE(bond) == BOND_MODE_8023AD) { 3831 if (slave->last_link_up) 3832 slave->link = BOND_LINK_FAIL; 3833 else 3834 slave->link = BOND_LINK_DOWN; 3835 } 3836 3837 if (BOND_MODE(bond) == BOND_MODE_8023AD) 3838 bond_3ad_adapter_speed_duplex_changed(slave); 3839 fallthrough; 3840 case NETDEV_DOWN: 3841 /* Refresh slave-array if applicable! 3842 * If the setup does not use miimon or arpmon (mode-specific!), 3843 * then these events will not cause the slave-array to be 3844 * refreshed. This will cause xmit to use a slave that is not 3845 * usable. Avoid such situation by refeshing the array at these 3846 * events. If these (miimon/arpmon) parameters are configured 3847 * then array gets refreshed twice and that should be fine! 3848 */ 3849 if (bond_mode_can_use_xmit_hash(bond)) 3850 bond_update_slave_arr(bond, NULL); 3851 break; 3852 case NETDEV_CHANGEMTU: 3853 /* TODO: Should slaves be allowed to 3854 * independently alter their MTU? For 3855 * an active-backup bond, slaves need 3856 * not be the same type of device, so 3857 * MTUs may vary. For other modes, 3858 * slaves arguably should have the 3859 * same MTUs. To do this, we'd need to 3860 * take over the slave's change_mtu 3861 * function for the duration of their 3862 * servitude. 3863 */ 3864 break; 3865 case NETDEV_CHANGENAME: 3866 /* we don't care if we don't have primary set */ 3867 if (!bond_uses_primary(bond) || 3868 !bond->params.primary[0]) 3869 break; 3870 3871 if (slave == primary) { 3872 /* slave's name changed - he's no longer primary */ 3873 RCU_INIT_POINTER(bond->primary_slave, NULL); 3874 } else if (!strcmp(slave_dev->name, bond->params.primary)) { 3875 /* we have a new primary slave */ 3876 rcu_assign_pointer(bond->primary_slave, slave); 3877 } else { /* we didn't change primary - exit */ 3878 break; 3879 } 3880 3881 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n", 3882 primary ? slave_dev->name : "none"); 3883 3884 block_netpoll_tx(); 3885 bond_select_active_slave(bond); 3886 unblock_netpoll_tx(); 3887 break; 3888 case NETDEV_FEAT_CHANGE: 3889 bond_compute_features(bond); 3890 break; 3891 case NETDEV_RESEND_IGMP: 3892 /* Propagate to master device */ 3893 call_netdevice_notifiers(event, slave->bond->dev); 3894 break; 3895 default: 3896 break; 3897 } 3898 3899 return NOTIFY_DONE; 3900 } 3901 3902 /* bond_netdev_event: handle netdev notifier chain events. 3903 * 3904 * This function receives events for the netdev chain. The caller (an 3905 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 3906 * locks for us to safely manipulate the slave devices (RTNL lock, 3907 * dev_probe_lock). 3908 */ 3909 static int bond_netdev_event(struct notifier_block *this, 3910 unsigned long event, void *ptr) 3911 { 3912 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 3913 3914 netdev_dbg(event_dev, "%s received %s\n", 3915 __func__, netdev_cmd_to_name(event)); 3916 3917 if (!(event_dev->priv_flags & IFF_BONDING)) 3918 return NOTIFY_DONE; 3919 3920 if (event_dev->flags & IFF_MASTER) { 3921 int ret; 3922 3923 ret = bond_master_netdev_event(event, event_dev); 3924 if (ret != NOTIFY_DONE) 3925 return ret; 3926 } 3927 3928 if (event_dev->flags & IFF_SLAVE) 3929 return bond_slave_netdev_event(event, event_dev); 3930 3931 return NOTIFY_DONE; 3932 } 3933 3934 static struct notifier_block bond_netdev_notifier = { 3935 .notifier_call = bond_netdev_event, 3936 }; 3937 3938 /*---------------------------- Hashing Policies -----------------------------*/ 3939 3940 /* Helper to access data in a packet, with or without a backing skb. 3941 * If skb is given the data is linearized if necessary via pskb_may_pull. 3942 */ 3943 static inline const void *bond_pull_data(struct sk_buff *skb, 3944 const void *data, int hlen, int n) 3945 { 3946 if (likely(n <= hlen)) 3947 return data; 3948 else if (skb && likely(pskb_may_pull(skb, n))) 3949 return skb->head; 3950 3951 return NULL; 3952 } 3953 3954 /* L2 hash helper */ 3955 static inline u32 bond_eth_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen) 3956 { 3957 struct ethhdr *ep; 3958 3959 data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr)); 3960 if (!data) 3961 return 0; 3962 3963 ep = (struct ethhdr *)(data + mhoff); 3964 return ep->h_dest[5] ^ ep->h_source[5] ^ be16_to_cpu(ep->h_proto); 3965 } 3966 3967 static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk, const void *data, 3968 int hlen, __be16 l2_proto, int *nhoff, int *ip_proto, bool l34) 3969 { 3970 const struct ipv6hdr *iph6; 3971 const struct iphdr *iph; 3972 3973 if (l2_proto == htons(ETH_P_IP)) { 3974 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph)); 3975 if (!data) 3976 return false; 3977 3978 iph = (const struct iphdr *)(data + *nhoff); 3979 iph_to_flow_copy_v4addrs(fk, iph); 3980 *nhoff += iph->ihl << 2; 3981 if (!ip_is_fragment(iph)) 3982 *ip_proto = iph->protocol; 3983 } else if (l2_proto == htons(ETH_P_IPV6)) { 3984 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph6)); 3985 if (!data) 3986 return false; 3987 3988 iph6 = (const struct ipv6hdr *)(data + *nhoff); 3989 iph_to_flow_copy_v6addrs(fk, iph6); 3990 *nhoff += sizeof(*iph6); 3991 *ip_proto = iph6->nexthdr; 3992 } else { 3993 return false; 3994 } 3995 3996 if (l34 && *ip_proto >= 0) 3997 fk->ports.ports = __skb_flow_get_ports(skb, *nhoff, *ip_proto, data, hlen); 3998 3999 return true; 4000 } 4001 4002 static u32 bond_vlan_srcmac_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen) 4003 { 4004 u32 srcmac_vendor = 0, srcmac_dev = 0; 4005 struct ethhdr *mac_hdr; 4006 u16 vlan = 0; 4007 int i; 4008 4009 data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr)); 4010 if (!data) 4011 return 0; 4012 mac_hdr = (struct ethhdr *)(data + mhoff); 4013 4014 for (i = 0; i < 3; i++) 4015 srcmac_vendor = (srcmac_vendor << 8) | mac_hdr->h_source[i]; 4016 4017 for (i = 3; i < ETH_ALEN; i++) 4018 srcmac_dev = (srcmac_dev << 8) | mac_hdr->h_source[i]; 4019 4020 if (skb && skb_vlan_tag_present(skb)) 4021 vlan = skb_vlan_tag_get(skb); 4022 4023 return vlan ^ srcmac_vendor ^ srcmac_dev; 4024 } 4025 4026 /* Extract the appropriate headers based on bond's xmit policy */ 4027 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, const void *data, 4028 __be16 l2_proto, int nhoff, int hlen, struct flow_keys *fk) 4029 { 4030 bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34; 4031 int ip_proto = -1; 4032 4033 switch (bond->params.xmit_policy) { 4034 case BOND_XMIT_POLICY_ENCAP23: 4035 case BOND_XMIT_POLICY_ENCAP34: 4036 memset(fk, 0, sizeof(*fk)); 4037 return __skb_flow_dissect(NULL, skb, &flow_keys_bonding, 4038 fk, data, l2_proto, nhoff, hlen, 0); 4039 default: 4040 break; 4041 } 4042 4043 fk->ports.ports = 0; 4044 memset(&fk->icmp, 0, sizeof(fk->icmp)); 4045 if (!bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34)) 4046 return false; 4047 4048 /* ICMP error packets contains at least 8 bytes of the header 4049 * of the packet which generated the error. Use this information 4050 * to correlate ICMP error packets within the same flow which 4051 * generated the error. 4052 */ 4053 if (ip_proto == IPPROTO_ICMP || ip_proto == IPPROTO_ICMPV6) { 4054 skb_flow_get_icmp_tci(skb, &fk->icmp, data, nhoff, hlen); 4055 if (ip_proto == IPPROTO_ICMP) { 4056 if (!icmp_is_err(fk->icmp.type)) 4057 return true; 4058 4059 nhoff += sizeof(struct icmphdr); 4060 } else if (ip_proto == IPPROTO_ICMPV6) { 4061 if (!icmpv6_is_err(fk->icmp.type)) 4062 return true; 4063 4064 nhoff += sizeof(struct icmp6hdr); 4065 } 4066 return bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34); 4067 } 4068 4069 return true; 4070 } 4071 4072 static u32 bond_ip_hash(u32 hash, struct flow_keys *flow, int xmit_policy) 4073 { 4074 hash ^= (__force u32)flow_get_u32_dst(flow) ^ 4075 (__force u32)flow_get_u32_src(flow); 4076 hash ^= (hash >> 16); 4077 hash ^= (hash >> 8); 4078 4079 /* discard lowest hash bit to deal with the common even ports pattern */ 4080 if (xmit_policy == BOND_XMIT_POLICY_LAYER34 || 4081 xmit_policy == BOND_XMIT_POLICY_ENCAP34) 4082 return hash >> 1; 4083 4084 return hash; 4085 } 4086 4087 /* Generate hash based on xmit policy. If @skb is given it is used to linearize 4088 * the data as required, but this function can be used without it if the data is 4089 * known to be linear (e.g. with xdp_buff). 4090 */ 4091 static u32 __bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, const void *data, 4092 __be16 l2_proto, int mhoff, int nhoff, int hlen) 4093 { 4094 struct flow_keys flow; 4095 u32 hash; 4096 4097 if (bond->params.xmit_policy == BOND_XMIT_POLICY_VLAN_SRCMAC) 4098 return bond_vlan_srcmac_hash(skb, data, mhoff, hlen); 4099 4100 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 || 4101 !bond_flow_dissect(bond, skb, data, l2_proto, nhoff, hlen, &flow)) 4102 return bond_eth_hash(skb, data, mhoff, hlen); 4103 4104 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 || 4105 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) { 4106 hash = bond_eth_hash(skb, data, mhoff, hlen); 4107 } else { 4108 if (flow.icmp.id) 4109 memcpy(&hash, &flow.icmp, sizeof(hash)); 4110 else 4111 memcpy(&hash, &flow.ports.ports, sizeof(hash)); 4112 } 4113 4114 return bond_ip_hash(hash, &flow, bond->params.xmit_policy); 4115 } 4116 4117 /** 4118 * bond_xmit_hash - generate a hash value based on the xmit policy 4119 * @bond: bonding device 4120 * @skb: buffer to use for headers 4121 * 4122 * This function will extract the necessary headers from the skb buffer and use 4123 * them to generate a hash based on the xmit_policy set in the bonding device 4124 */ 4125 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb) 4126 { 4127 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 && 4128 skb->l4_hash) 4129 return skb->hash; 4130 4131 return __bond_xmit_hash(bond, skb, skb->data, skb->protocol, 4132 skb_mac_offset(skb), skb_network_offset(skb), 4133 skb_headlen(skb)); 4134 } 4135 4136 /** 4137 * bond_xmit_hash_xdp - generate a hash value based on the xmit policy 4138 * @bond: bonding device 4139 * @xdp: buffer to use for headers 4140 * 4141 * The XDP variant of bond_xmit_hash. 4142 */ 4143 static u32 bond_xmit_hash_xdp(struct bonding *bond, struct xdp_buff *xdp) 4144 { 4145 struct ethhdr *eth; 4146 4147 if (xdp->data + sizeof(struct ethhdr) > xdp->data_end) 4148 return 0; 4149 4150 eth = (struct ethhdr *)xdp->data; 4151 4152 return __bond_xmit_hash(bond, NULL, xdp->data, eth->h_proto, 0, 4153 sizeof(struct ethhdr), xdp->data_end - xdp->data); 4154 } 4155 4156 /*-------------------------- Device entry points ----------------------------*/ 4157 4158 void bond_work_init_all(struct bonding *bond) 4159 { 4160 INIT_DELAYED_WORK(&bond->mcast_work, 4161 bond_resend_igmp_join_requests_delayed); 4162 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 4163 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 4164 INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor); 4165 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 4166 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler); 4167 } 4168 4169 static void bond_work_cancel_all(struct bonding *bond) 4170 { 4171 cancel_delayed_work_sync(&bond->mii_work); 4172 cancel_delayed_work_sync(&bond->arp_work); 4173 cancel_delayed_work_sync(&bond->alb_work); 4174 cancel_delayed_work_sync(&bond->ad_work); 4175 cancel_delayed_work_sync(&bond->mcast_work); 4176 cancel_delayed_work_sync(&bond->slave_arr_work); 4177 } 4178 4179 static int bond_open(struct net_device *bond_dev) 4180 { 4181 struct bonding *bond = netdev_priv(bond_dev); 4182 struct list_head *iter; 4183 struct slave *slave; 4184 4185 /* reset slave->backup and slave->inactive */ 4186 if (bond_has_slaves(bond)) { 4187 bond_for_each_slave(bond, slave, iter) { 4188 if (bond_uses_primary(bond) && 4189 slave != rcu_access_pointer(bond->curr_active_slave)) { 4190 bond_set_slave_inactive_flags(slave, 4191 BOND_SLAVE_NOTIFY_NOW); 4192 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) { 4193 bond_set_slave_active_flags(slave, 4194 BOND_SLAVE_NOTIFY_NOW); 4195 } 4196 } 4197 } 4198 4199 if (bond_is_lb(bond)) { 4200 /* bond_alb_initialize must be called before the timer 4201 * is started. 4202 */ 4203 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB))) 4204 return -ENOMEM; 4205 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB) 4206 queue_delayed_work(bond->wq, &bond->alb_work, 0); 4207 } 4208 4209 if (bond->params.miimon) /* link check interval, in milliseconds. */ 4210 queue_delayed_work(bond->wq, &bond->mii_work, 0); 4211 4212 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 4213 queue_delayed_work(bond->wq, &bond->arp_work, 0); 4214 bond->recv_probe = bond_rcv_validate; 4215 } 4216 4217 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 4218 queue_delayed_work(bond->wq, &bond->ad_work, 0); 4219 /* register to receive LACPDUs */ 4220 bond->recv_probe = bond_3ad_lacpdu_recv; 4221 bond_3ad_initiate_agg_selection(bond, 1); 4222 4223 bond_for_each_slave(bond, slave, iter) 4224 dev_mc_add(slave->dev, lacpdu_mcast_addr); 4225 } 4226 4227 if (bond_mode_can_use_xmit_hash(bond)) 4228 bond_update_slave_arr(bond, NULL); 4229 4230 return 0; 4231 } 4232 4233 static int bond_close(struct net_device *bond_dev) 4234 { 4235 struct bonding *bond = netdev_priv(bond_dev); 4236 struct slave *slave; 4237 4238 bond_work_cancel_all(bond); 4239 bond->send_peer_notif = 0; 4240 if (bond_is_lb(bond)) 4241 bond_alb_deinitialize(bond); 4242 bond->recv_probe = NULL; 4243 4244 if (bond_uses_primary(bond)) { 4245 rcu_read_lock(); 4246 slave = rcu_dereference(bond->curr_active_slave); 4247 if (slave) 4248 bond_hw_addr_flush(bond_dev, slave->dev); 4249 rcu_read_unlock(); 4250 } else { 4251 struct list_head *iter; 4252 4253 bond_for_each_slave(bond, slave, iter) 4254 bond_hw_addr_flush(bond_dev, slave->dev); 4255 } 4256 4257 return 0; 4258 } 4259 4260 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but 4261 * that some drivers can provide 32bit values only. 4262 */ 4263 static void bond_fold_stats(struct rtnl_link_stats64 *_res, 4264 const struct rtnl_link_stats64 *_new, 4265 const struct rtnl_link_stats64 *_old) 4266 { 4267 const u64 *new = (const u64 *)_new; 4268 const u64 *old = (const u64 *)_old; 4269 u64 *res = (u64 *)_res; 4270 int i; 4271 4272 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) { 4273 u64 nv = new[i]; 4274 u64 ov = old[i]; 4275 s64 delta = nv - ov; 4276 4277 /* detects if this particular field is 32bit only */ 4278 if (((nv | ov) >> 32) == 0) 4279 delta = (s64)(s32)((u32)nv - (u32)ov); 4280 4281 /* filter anomalies, some drivers reset their stats 4282 * at down/up events. 4283 */ 4284 if (delta > 0) 4285 res[i] += delta; 4286 } 4287 } 4288 4289 #ifdef CONFIG_LOCKDEP 4290 static int bond_get_lowest_level_rcu(struct net_device *dev) 4291 { 4292 struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; 4293 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; 4294 int cur = 0, max = 0; 4295 4296 now = dev; 4297 iter = &dev->adj_list.lower; 4298 4299 while (1) { 4300 next = NULL; 4301 while (1) { 4302 ldev = netdev_next_lower_dev_rcu(now, &iter); 4303 if (!ldev) 4304 break; 4305 4306 next = ldev; 4307 niter = &ldev->adj_list.lower; 4308 dev_stack[cur] = now; 4309 iter_stack[cur++] = iter; 4310 if (max <= cur) 4311 max = cur; 4312 break; 4313 } 4314 4315 if (!next) { 4316 if (!cur) 4317 return max; 4318 next = dev_stack[--cur]; 4319 niter = iter_stack[cur]; 4320 } 4321 4322 now = next; 4323 iter = niter; 4324 } 4325 4326 return max; 4327 } 4328 #endif 4329 4330 static void bond_get_stats(struct net_device *bond_dev, 4331 struct rtnl_link_stats64 *stats) 4332 { 4333 struct bonding *bond = netdev_priv(bond_dev); 4334 struct rtnl_link_stats64 temp; 4335 struct list_head *iter; 4336 struct slave *slave; 4337 int nest_level = 0; 4338 4339 4340 rcu_read_lock(); 4341 #ifdef CONFIG_LOCKDEP 4342 nest_level = bond_get_lowest_level_rcu(bond_dev); 4343 #endif 4344 4345 spin_lock_nested(&bond->stats_lock, nest_level); 4346 memcpy(stats, &bond->bond_stats, sizeof(*stats)); 4347 4348 bond_for_each_slave_rcu(bond, slave, iter) { 4349 const struct rtnl_link_stats64 *new = 4350 dev_get_stats(slave->dev, &temp); 4351 4352 bond_fold_stats(stats, new, &slave->slave_stats); 4353 4354 /* save off the slave stats for the next run */ 4355 memcpy(&slave->slave_stats, new, sizeof(*new)); 4356 } 4357 4358 memcpy(&bond->bond_stats, stats, sizeof(*stats)); 4359 spin_unlock(&bond->stats_lock); 4360 rcu_read_unlock(); 4361 } 4362 4363 static int bond_eth_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 4364 { 4365 struct bonding *bond = netdev_priv(bond_dev); 4366 struct mii_ioctl_data *mii = NULL; 4367 const struct net_device_ops *ops; 4368 struct net_device *real_dev; 4369 struct hwtstamp_config cfg; 4370 struct ifreq ifrr; 4371 int res = 0; 4372 4373 netdev_dbg(bond_dev, "bond_eth_ioctl: cmd=%d\n", cmd); 4374 4375 switch (cmd) { 4376 case SIOCGMIIPHY: 4377 mii = if_mii(ifr); 4378 if (!mii) 4379 return -EINVAL; 4380 4381 mii->phy_id = 0; 4382 fallthrough; 4383 case SIOCGMIIREG: 4384 /* We do this again just in case we were called by SIOCGMIIREG 4385 * instead of SIOCGMIIPHY. 4386 */ 4387 mii = if_mii(ifr); 4388 if (!mii) 4389 return -EINVAL; 4390 4391 if (mii->reg_num == 1) { 4392 mii->val_out = 0; 4393 if (netif_carrier_ok(bond->dev)) 4394 mii->val_out = BMSR_LSTATUS; 4395 } 4396 4397 break; 4398 case SIOCSHWTSTAMP: 4399 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) 4400 return -EFAULT; 4401 4402 if (!(cfg.flags & HWTSTAMP_FLAG_BONDED_PHC_INDEX)) 4403 return -EOPNOTSUPP; 4404 4405 fallthrough; 4406 case SIOCGHWTSTAMP: 4407 real_dev = bond_option_active_slave_get_rcu(bond); 4408 if (!real_dev) 4409 return -EOPNOTSUPP; 4410 4411 strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ); 4412 ifrr.ifr_ifru = ifr->ifr_ifru; 4413 4414 ops = real_dev->netdev_ops; 4415 if (netif_device_present(real_dev) && ops->ndo_eth_ioctl) { 4416 res = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd); 4417 if (res) 4418 return res; 4419 4420 ifr->ifr_ifru = ifrr.ifr_ifru; 4421 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) 4422 return -EFAULT; 4423 4424 /* Set the BOND_PHC_INDEX flag to notify user space */ 4425 cfg.flags |= HWTSTAMP_FLAG_BONDED_PHC_INDEX; 4426 4427 return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? 4428 -EFAULT : 0; 4429 } 4430 fallthrough; 4431 default: 4432 res = -EOPNOTSUPP; 4433 } 4434 4435 return res; 4436 } 4437 4438 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 4439 { 4440 struct bonding *bond = netdev_priv(bond_dev); 4441 struct net_device *slave_dev = NULL; 4442 struct ifbond k_binfo; 4443 struct ifbond __user *u_binfo = NULL; 4444 struct ifslave k_sinfo; 4445 struct ifslave __user *u_sinfo = NULL; 4446 struct bond_opt_value newval; 4447 struct net *net; 4448 int res = 0; 4449 4450 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd); 4451 4452 switch (cmd) { 4453 case SIOCBONDINFOQUERY: 4454 u_binfo = (struct ifbond __user *)ifr->ifr_data; 4455 4456 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 4457 return -EFAULT; 4458 4459 bond_info_query(bond_dev, &k_binfo); 4460 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 4461 return -EFAULT; 4462 4463 return 0; 4464 case SIOCBONDSLAVEINFOQUERY: 4465 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 4466 4467 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 4468 return -EFAULT; 4469 4470 res = bond_slave_info_query(bond_dev, &k_sinfo); 4471 if (res == 0 && 4472 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 4473 return -EFAULT; 4474 4475 return res; 4476 default: 4477 break; 4478 } 4479 4480 net = dev_net(bond_dev); 4481 4482 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 4483 return -EPERM; 4484 4485 slave_dev = __dev_get_by_name(net, ifr->ifr_slave); 4486 4487 slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev); 4488 4489 if (!slave_dev) 4490 return -ENODEV; 4491 4492 switch (cmd) { 4493 case SIOCBONDENSLAVE: 4494 res = bond_enslave(bond_dev, slave_dev, NULL); 4495 break; 4496 case SIOCBONDRELEASE: 4497 res = bond_release(bond_dev, slave_dev); 4498 break; 4499 case SIOCBONDSETHWADDR: 4500 res = bond_set_dev_addr(bond_dev, slave_dev); 4501 break; 4502 case SIOCBONDCHANGEACTIVE: 4503 bond_opt_initstr(&newval, slave_dev->name); 4504 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE, 4505 &newval); 4506 break; 4507 default: 4508 res = -EOPNOTSUPP; 4509 } 4510 4511 return res; 4512 } 4513 4514 static int bond_siocdevprivate(struct net_device *bond_dev, struct ifreq *ifr, 4515 void __user *data, int cmd) 4516 { 4517 struct ifreq ifrdata = { .ifr_data = data }; 4518 4519 switch (cmd) { 4520 case BOND_INFO_QUERY_OLD: 4521 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDINFOQUERY); 4522 case BOND_SLAVE_INFO_QUERY_OLD: 4523 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDSLAVEINFOQUERY); 4524 case BOND_ENSLAVE_OLD: 4525 return bond_do_ioctl(bond_dev, ifr, SIOCBONDENSLAVE); 4526 case BOND_RELEASE_OLD: 4527 return bond_do_ioctl(bond_dev, ifr, SIOCBONDRELEASE); 4528 case BOND_SETHWADDR_OLD: 4529 return bond_do_ioctl(bond_dev, ifr, SIOCBONDSETHWADDR); 4530 case BOND_CHANGE_ACTIVE_OLD: 4531 return bond_do_ioctl(bond_dev, ifr, SIOCBONDCHANGEACTIVE); 4532 } 4533 4534 return -EOPNOTSUPP; 4535 } 4536 4537 static void bond_change_rx_flags(struct net_device *bond_dev, int change) 4538 { 4539 struct bonding *bond = netdev_priv(bond_dev); 4540 4541 if (change & IFF_PROMISC) 4542 bond_set_promiscuity(bond, 4543 bond_dev->flags & IFF_PROMISC ? 1 : -1); 4544 4545 if (change & IFF_ALLMULTI) 4546 bond_set_allmulti(bond, 4547 bond_dev->flags & IFF_ALLMULTI ? 1 : -1); 4548 } 4549 4550 static void bond_set_rx_mode(struct net_device *bond_dev) 4551 { 4552 struct bonding *bond = netdev_priv(bond_dev); 4553 struct list_head *iter; 4554 struct slave *slave; 4555 4556 rcu_read_lock(); 4557 if (bond_uses_primary(bond)) { 4558 slave = rcu_dereference(bond->curr_active_slave); 4559 if (slave) { 4560 dev_uc_sync(slave->dev, bond_dev); 4561 dev_mc_sync(slave->dev, bond_dev); 4562 } 4563 } else { 4564 bond_for_each_slave_rcu(bond, slave, iter) { 4565 dev_uc_sync_multiple(slave->dev, bond_dev); 4566 dev_mc_sync_multiple(slave->dev, bond_dev); 4567 } 4568 } 4569 rcu_read_unlock(); 4570 } 4571 4572 static int bond_neigh_init(struct neighbour *n) 4573 { 4574 struct bonding *bond = netdev_priv(n->dev); 4575 const struct net_device_ops *slave_ops; 4576 struct neigh_parms parms; 4577 struct slave *slave; 4578 int ret = 0; 4579 4580 rcu_read_lock(); 4581 slave = bond_first_slave_rcu(bond); 4582 if (!slave) 4583 goto out; 4584 slave_ops = slave->dev->netdev_ops; 4585 if (!slave_ops->ndo_neigh_setup) 4586 goto out; 4587 4588 /* TODO: find another way [1] to implement this. 4589 * Passing a zeroed structure is fragile, 4590 * but at least we do not pass garbage. 4591 * 4592 * [1] One way would be that ndo_neigh_setup() never touch 4593 * struct neigh_parms, but propagate the new neigh_setup() 4594 * back to ___neigh_create() / neigh_parms_alloc() 4595 */ 4596 memset(&parms, 0, sizeof(parms)); 4597 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); 4598 4599 if (ret) 4600 goto out; 4601 4602 if (parms.neigh_setup) 4603 ret = parms.neigh_setup(n); 4604 out: 4605 rcu_read_unlock(); 4606 return ret; 4607 } 4608 4609 /* The bonding ndo_neigh_setup is called at init time beofre any 4610 * slave exists. So we must declare proxy setup function which will 4611 * be used at run time to resolve the actual slave neigh param setup. 4612 * 4613 * It's also called by master devices (such as vlans) to setup their 4614 * underlying devices. In that case - do nothing, we're already set up from 4615 * our init. 4616 */ 4617 static int bond_neigh_setup(struct net_device *dev, 4618 struct neigh_parms *parms) 4619 { 4620 /* modify only our neigh_parms */ 4621 if (parms->dev == dev) 4622 parms->neigh_setup = bond_neigh_init; 4623 4624 return 0; 4625 } 4626 4627 /* Change the MTU of all of a master's slaves to match the master */ 4628 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 4629 { 4630 struct bonding *bond = netdev_priv(bond_dev); 4631 struct slave *slave, *rollback_slave; 4632 struct list_head *iter; 4633 int res = 0; 4634 4635 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu); 4636 4637 bond_for_each_slave(bond, slave, iter) { 4638 slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n", 4639 slave, slave->dev->netdev_ops->ndo_change_mtu); 4640 4641 res = dev_set_mtu(slave->dev, new_mtu); 4642 4643 if (res) { 4644 /* If we failed to set the slave's mtu to the new value 4645 * we must abort the operation even in ACTIVE_BACKUP 4646 * mode, because if we allow the backup slaves to have 4647 * different mtu values than the active slave we'll 4648 * need to change their mtu when doing a failover. That 4649 * means changing their mtu from timer context, which 4650 * is probably not a good idea. 4651 */ 4652 slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n", 4653 res, new_mtu); 4654 goto unwind; 4655 } 4656 } 4657 4658 bond_dev->mtu = new_mtu; 4659 4660 return 0; 4661 4662 unwind: 4663 /* unwind from head to the slave that failed */ 4664 bond_for_each_slave(bond, rollback_slave, iter) { 4665 int tmp_res; 4666 4667 if (rollback_slave == slave) 4668 break; 4669 4670 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu); 4671 if (tmp_res) 4672 slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n", 4673 tmp_res); 4674 } 4675 4676 return res; 4677 } 4678 4679 /* Change HW address 4680 * 4681 * Note that many devices must be down to change the HW address, and 4682 * downing the master releases all slaves. We can make bonds full of 4683 * bonding devices to test this, however. 4684 */ 4685 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 4686 { 4687 struct bonding *bond = netdev_priv(bond_dev); 4688 struct slave *slave, *rollback_slave; 4689 struct sockaddr_storage *ss = addr, tmp_ss; 4690 struct list_head *iter; 4691 int res = 0; 4692 4693 if (BOND_MODE(bond) == BOND_MODE_ALB) 4694 return bond_alb_set_mac_address(bond_dev, addr); 4695 4696 4697 netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond); 4698 4699 /* If fail_over_mac is enabled, do nothing and return success. 4700 * Returning an error causes ifenslave to fail. 4701 */ 4702 if (bond->params.fail_over_mac && 4703 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 4704 return 0; 4705 4706 if (!is_valid_ether_addr(ss->__data)) 4707 return -EADDRNOTAVAIL; 4708 4709 bond_for_each_slave(bond, slave, iter) { 4710 slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n", 4711 __func__, slave); 4712 res = dev_set_mac_address(slave->dev, addr, NULL); 4713 if (res) { 4714 /* TODO: consider downing the slave 4715 * and retry ? 4716 * User should expect communications 4717 * breakage anyway until ARP finish 4718 * updating, so... 4719 */ 4720 slave_dbg(bond_dev, slave->dev, "%s: err %d\n", 4721 __func__, res); 4722 goto unwind; 4723 } 4724 } 4725 4726 /* success */ 4727 dev_addr_set(bond_dev, ss->__data); 4728 return 0; 4729 4730 unwind: 4731 memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 4732 tmp_ss.ss_family = bond_dev->type; 4733 4734 /* unwind from head to the slave that failed */ 4735 bond_for_each_slave(bond, rollback_slave, iter) { 4736 int tmp_res; 4737 4738 if (rollback_slave == slave) 4739 break; 4740 4741 tmp_res = dev_set_mac_address(rollback_slave->dev, 4742 (struct sockaddr *)&tmp_ss, NULL); 4743 if (tmp_res) { 4744 slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n", 4745 __func__, tmp_res); 4746 } 4747 } 4748 4749 return res; 4750 } 4751 4752 /** 4753 * bond_get_slave_by_id - get xmit slave with slave_id 4754 * @bond: bonding device that is transmitting 4755 * @slave_id: slave id up to slave_cnt-1 through which to transmit 4756 * 4757 * This function tries to get slave with slave_id but in case 4758 * it fails, it tries to find the first available slave for transmission. 4759 */ 4760 static struct slave *bond_get_slave_by_id(struct bonding *bond, 4761 int slave_id) 4762 { 4763 struct list_head *iter; 4764 struct slave *slave; 4765 int i = slave_id; 4766 4767 /* Here we start from the slave with slave_id */ 4768 bond_for_each_slave_rcu(bond, slave, iter) { 4769 if (--i < 0) { 4770 if (bond_slave_can_tx(slave)) 4771 return slave; 4772 } 4773 } 4774 4775 /* Here we start from the first slave up to slave_id */ 4776 i = slave_id; 4777 bond_for_each_slave_rcu(bond, slave, iter) { 4778 if (--i < 0) 4779 break; 4780 if (bond_slave_can_tx(slave)) 4781 return slave; 4782 } 4783 /* no slave that can tx has been found */ 4784 return NULL; 4785 } 4786 4787 /** 4788 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave 4789 * @bond: bonding device to use 4790 * 4791 * Based on the value of the bonding device's packets_per_slave parameter 4792 * this function generates a slave id, which is usually used as the next 4793 * slave to transmit through. 4794 */ 4795 static u32 bond_rr_gen_slave_id(struct bonding *bond) 4796 { 4797 u32 slave_id; 4798 struct reciprocal_value reciprocal_packets_per_slave; 4799 int packets_per_slave = bond->params.packets_per_slave; 4800 4801 switch (packets_per_slave) { 4802 case 0: 4803 slave_id = prandom_u32(); 4804 break; 4805 case 1: 4806 slave_id = this_cpu_inc_return(*bond->rr_tx_counter); 4807 break; 4808 default: 4809 reciprocal_packets_per_slave = 4810 bond->params.reciprocal_packets_per_slave; 4811 slave_id = this_cpu_inc_return(*bond->rr_tx_counter); 4812 slave_id = reciprocal_divide(slave_id, 4813 reciprocal_packets_per_slave); 4814 break; 4815 } 4816 4817 return slave_id; 4818 } 4819 4820 static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond, 4821 struct sk_buff *skb) 4822 { 4823 struct slave *slave; 4824 int slave_cnt; 4825 u32 slave_id; 4826 4827 /* Start with the curr_active_slave that joined the bond as the 4828 * default for sending IGMP traffic. For failover purposes one 4829 * needs to maintain some consistency for the interface that will 4830 * send the join/membership reports. The curr_active_slave found 4831 * will send all of this type of traffic. 4832 */ 4833 if (skb->protocol == htons(ETH_P_IP)) { 4834 int noff = skb_network_offset(skb); 4835 struct iphdr *iph; 4836 4837 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph)))) 4838 goto non_igmp; 4839 4840 iph = ip_hdr(skb); 4841 if (iph->protocol == IPPROTO_IGMP) { 4842 slave = rcu_dereference(bond->curr_active_slave); 4843 if (slave) 4844 return slave; 4845 return bond_get_slave_by_id(bond, 0); 4846 } 4847 } 4848 4849 non_igmp: 4850 slave_cnt = READ_ONCE(bond->slave_cnt); 4851 if (likely(slave_cnt)) { 4852 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt; 4853 return bond_get_slave_by_id(bond, slave_id); 4854 } 4855 return NULL; 4856 } 4857 4858 static struct slave *bond_xdp_xmit_roundrobin_slave_get(struct bonding *bond, 4859 struct xdp_buff *xdp) 4860 { 4861 struct slave *slave; 4862 int slave_cnt; 4863 u32 slave_id; 4864 const struct ethhdr *eth; 4865 void *data = xdp->data; 4866 4867 if (data + sizeof(struct ethhdr) > xdp->data_end) 4868 goto non_igmp; 4869 4870 eth = (struct ethhdr *)data; 4871 data += sizeof(struct ethhdr); 4872 4873 /* See comment on IGMP in bond_xmit_roundrobin_slave_get() */ 4874 if (eth->h_proto == htons(ETH_P_IP)) { 4875 const struct iphdr *iph; 4876 4877 if (data + sizeof(struct iphdr) > xdp->data_end) 4878 goto non_igmp; 4879 4880 iph = (struct iphdr *)data; 4881 4882 if (iph->protocol == IPPROTO_IGMP) { 4883 slave = rcu_dereference(bond->curr_active_slave); 4884 if (slave) 4885 return slave; 4886 return bond_get_slave_by_id(bond, 0); 4887 } 4888 } 4889 4890 non_igmp: 4891 slave_cnt = READ_ONCE(bond->slave_cnt); 4892 if (likely(slave_cnt)) { 4893 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt; 4894 return bond_get_slave_by_id(bond, slave_id); 4895 } 4896 return NULL; 4897 } 4898 4899 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb, 4900 struct net_device *bond_dev) 4901 { 4902 struct bonding *bond = netdev_priv(bond_dev); 4903 struct slave *slave; 4904 4905 slave = bond_xmit_roundrobin_slave_get(bond, skb); 4906 if (likely(slave)) 4907 return bond_dev_queue_xmit(bond, skb, slave->dev); 4908 4909 return bond_tx_drop(bond_dev, skb); 4910 } 4911 4912 static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond) 4913 { 4914 return rcu_dereference(bond->curr_active_slave); 4915 } 4916 4917 /* In active-backup mode, we know that bond->curr_active_slave is always valid if 4918 * the bond has a usable interface. 4919 */ 4920 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb, 4921 struct net_device *bond_dev) 4922 { 4923 struct bonding *bond = netdev_priv(bond_dev); 4924 struct slave *slave; 4925 4926 slave = bond_xmit_activebackup_slave_get(bond); 4927 if (slave) 4928 return bond_dev_queue_xmit(bond, skb, slave->dev); 4929 4930 return bond_tx_drop(bond_dev, skb); 4931 } 4932 4933 /* Use this to update slave_array when (a) it's not appropriate to update 4934 * slave_array right away (note that update_slave_array() may sleep) 4935 * and / or (b) RTNL is not held. 4936 */ 4937 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay) 4938 { 4939 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay); 4940 } 4941 4942 /* Slave array work handler. Holds only RTNL */ 4943 static void bond_slave_arr_handler(struct work_struct *work) 4944 { 4945 struct bonding *bond = container_of(work, struct bonding, 4946 slave_arr_work.work); 4947 int ret; 4948 4949 if (!rtnl_trylock()) 4950 goto err; 4951 4952 ret = bond_update_slave_arr(bond, NULL); 4953 rtnl_unlock(); 4954 if (ret) { 4955 pr_warn_ratelimited("Failed to update slave array from WT\n"); 4956 goto err; 4957 } 4958 return; 4959 4960 err: 4961 bond_slave_arr_work_rearm(bond, 1); 4962 } 4963 4964 static void bond_skip_slave(struct bond_up_slave *slaves, 4965 struct slave *skipslave) 4966 { 4967 int idx; 4968 4969 /* Rare situation where caller has asked to skip a specific 4970 * slave but allocation failed (most likely!). BTW this is 4971 * only possible when the call is initiated from 4972 * __bond_release_one(). In this situation; overwrite the 4973 * skipslave entry in the array with the last entry from the 4974 * array to avoid a situation where the xmit path may choose 4975 * this to-be-skipped slave to send a packet out. 4976 */ 4977 for (idx = 0; slaves && idx < slaves->count; idx++) { 4978 if (skipslave == slaves->arr[idx]) { 4979 slaves->arr[idx] = 4980 slaves->arr[slaves->count - 1]; 4981 slaves->count--; 4982 break; 4983 } 4984 } 4985 } 4986 4987 static void bond_set_slave_arr(struct bonding *bond, 4988 struct bond_up_slave *usable_slaves, 4989 struct bond_up_slave *all_slaves) 4990 { 4991 struct bond_up_slave *usable, *all; 4992 4993 usable = rtnl_dereference(bond->usable_slaves); 4994 rcu_assign_pointer(bond->usable_slaves, usable_slaves); 4995 kfree_rcu(usable, rcu); 4996 4997 all = rtnl_dereference(bond->all_slaves); 4998 rcu_assign_pointer(bond->all_slaves, all_slaves); 4999 kfree_rcu(all, rcu); 5000 } 5001 5002 static void bond_reset_slave_arr(struct bonding *bond) 5003 { 5004 struct bond_up_slave *usable, *all; 5005 5006 usable = rtnl_dereference(bond->usable_slaves); 5007 if (usable) { 5008 RCU_INIT_POINTER(bond->usable_slaves, NULL); 5009 kfree_rcu(usable, rcu); 5010 } 5011 5012 all = rtnl_dereference(bond->all_slaves); 5013 if (all) { 5014 RCU_INIT_POINTER(bond->all_slaves, NULL); 5015 kfree_rcu(all, rcu); 5016 } 5017 } 5018 5019 /* Build the usable slaves array in control path for modes that use xmit-hash 5020 * to determine the slave interface - 5021 * (a) BOND_MODE_8023AD 5022 * (b) BOND_MODE_XOR 5023 * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0 5024 * 5025 * The caller is expected to hold RTNL only and NO other lock! 5026 */ 5027 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave) 5028 { 5029 struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL; 5030 struct slave *slave; 5031 struct list_head *iter; 5032 int agg_id = 0; 5033 int ret = 0; 5034 5035 might_sleep(); 5036 5037 usable_slaves = kzalloc(struct_size(usable_slaves, arr, 5038 bond->slave_cnt), GFP_KERNEL); 5039 all_slaves = kzalloc(struct_size(all_slaves, arr, 5040 bond->slave_cnt), GFP_KERNEL); 5041 if (!usable_slaves || !all_slaves) { 5042 ret = -ENOMEM; 5043 goto out; 5044 } 5045 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 5046 struct ad_info ad_info; 5047 5048 spin_lock_bh(&bond->mode_lock); 5049 if (bond_3ad_get_active_agg_info(bond, &ad_info)) { 5050 spin_unlock_bh(&bond->mode_lock); 5051 pr_debug("bond_3ad_get_active_agg_info failed\n"); 5052 /* No active aggragator means it's not safe to use 5053 * the previous array. 5054 */ 5055 bond_reset_slave_arr(bond); 5056 goto out; 5057 } 5058 spin_unlock_bh(&bond->mode_lock); 5059 agg_id = ad_info.aggregator_id; 5060 } 5061 bond_for_each_slave(bond, slave, iter) { 5062 if (skipslave == slave) 5063 continue; 5064 5065 all_slaves->arr[all_slaves->count++] = slave; 5066 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 5067 struct aggregator *agg; 5068 5069 agg = SLAVE_AD_INFO(slave)->port.aggregator; 5070 if (!agg || agg->aggregator_identifier != agg_id) 5071 continue; 5072 } 5073 if (!bond_slave_can_tx(slave)) 5074 continue; 5075 5076 slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n", 5077 usable_slaves->count); 5078 5079 usable_slaves->arr[usable_slaves->count++] = slave; 5080 } 5081 5082 bond_set_slave_arr(bond, usable_slaves, all_slaves); 5083 return ret; 5084 out: 5085 if (ret != 0 && skipslave) { 5086 bond_skip_slave(rtnl_dereference(bond->all_slaves), 5087 skipslave); 5088 bond_skip_slave(rtnl_dereference(bond->usable_slaves), 5089 skipslave); 5090 } 5091 kfree_rcu(all_slaves, rcu); 5092 kfree_rcu(usable_slaves, rcu); 5093 5094 return ret; 5095 } 5096 5097 static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond, 5098 struct sk_buff *skb, 5099 struct bond_up_slave *slaves) 5100 { 5101 struct slave *slave; 5102 unsigned int count; 5103 u32 hash; 5104 5105 hash = bond_xmit_hash(bond, skb); 5106 count = slaves ? READ_ONCE(slaves->count) : 0; 5107 if (unlikely(!count)) 5108 return NULL; 5109 5110 slave = slaves->arr[hash % count]; 5111 return slave; 5112 } 5113 5114 static struct slave *bond_xdp_xmit_3ad_xor_slave_get(struct bonding *bond, 5115 struct xdp_buff *xdp) 5116 { 5117 struct bond_up_slave *slaves; 5118 unsigned int count; 5119 u32 hash; 5120 5121 hash = bond_xmit_hash_xdp(bond, xdp); 5122 slaves = rcu_dereference(bond->usable_slaves); 5123 count = slaves ? READ_ONCE(slaves->count) : 0; 5124 if (unlikely(!count)) 5125 return NULL; 5126 5127 return slaves->arr[hash % count]; 5128 } 5129 5130 /* Use this Xmit function for 3AD as well as XOR modes. The current 5131 * usable slave array is formed in the control path. The xmit function 5132 * just calculates hash and sends the packet out. 5133 */ 5134 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb, 5135 struct net_device *dev) 5136 { 5137 struct bonding *bond = netdev_priv(dev); 5138 struct bond_up_slave *slaves; 5139 struct slave *slave; 5140 5141 slaves = rcu_dereference(bond->usable_slaves); 5142 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves); 5143 if (likely(slave)) 5144 return bond_dev_queue_xmit(bond, skb, slave->dev); 5145 5146 return bond_tx_drop(dev, skb); 5147 } 5148 5149 /* in broadcast mode, we send everything to all usable interfaces. */ 5150 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb, 5151 struct net_device *bond_dev) 5152 { 5153 struct bonding *bond = netdev_priv(bond_dev); 5154 struct slave *slave = NULL; 5155 struct list_head *iter; 5156 bool xmit_suc = false; 5157 bool skb_used = false; 5158 5159 bond_for_each_slave_rcu(bond, slave, iter) { 5160 struct sk_buff *skb2; 5161 5162 if (!(bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)) 5163 continue; 5164 5165 if (bond_is_last_slave(bond, slave)) { 5166 skb2 = skb; 5167 skb_used = true; 5168 } else { 5169 skb2 = skb_clone(skb, GFP_ATOMIC); 5170 if (!skb2) { 5171 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n", 5172 bond_dev->name, __func__); 5173 continue; 5174 } 5175 } 5176 5177 if (bond_dev_queue_xmit(bond, skb2, slave->dev) == NETDEV_TX_OK) 5178 xmit_suc = true; 5179 } 5180 5181 if (!skb_used) 5182 dev_kfree_skb_any(skb); 5183 5184 if (xmit_suc) 5185 return NETDEV_TX_OK; 5186 5187 dev_core_stats_tx_dropped_inc(bond_dev); 5188 return NET_XMIT_DROP; 5189 } 5190 5191 /*------------------------- Device initialization ---------------------------*/ 5192 5193 /* Lookup the slave that corresponds to a qid */ 5194 static inline int bond_slave_override(struct bonding *bond, 5195 struct sk_buff *skb) 5196 { 5197 struct slave *slave = NULL; 5198 struct list_head *iter; 5199 5200 if (!skb_rx_queue_recorded(skb)) 5201 return 1; 5202 5203 /* Find out if any slaves have the same mapping as this skb. */ 5204 bond_for_each_slave_rcu(bond, slave, iter) { 5205 if (slave->queue_id == skb_get_queue_mapping(skb)) { 5206 if (bond_slave_is_up(slave) && 5207 slave->link == BOND_LINK_UP) { 5208 bond_dev_queue_xmit(bond, skb, slave->dev); 5209 return 0; 5210 } 5211 /* If the slave isn't UP, use default transmit policy. */ 5212 break; 5213 } 5214 } 5215 5216 return 1; 5217 } 5218 5219 5220 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb, 5221 struct net_device *sb_dev) 5222 { 5223 /* This helper function exists to help dev_pick_tx get the correct 5224 * destination queue. Using a helper function skips a call to 5225 * skb_tx_hash and will put the skbs in the queue we expect on their 5226 * way down to the bonding driver. 5227 */ 5228 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 5229 5230 /* Save the original txq to restore before passing to the driver */ 5231 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb); 5232 5233 if (unlikely(txq >= dev->real_num_tx_queues)) { 5234 do { 5235 txq -= dev->real_num_tx_queues; 5236 } while (txq >= dev->real_num_tx_queues); 5237 } 5238 return txq; 5239 } 5240 5241 static struct net_device *bond_xmit_get_slave(struct net_device *master_dev, 5242 struct sk_buff *skb, 5243 bool all_slaves) 5244 { 5245 struct bonding *bond = netdev_priv(master_dev); 5246 struct bond_up_slave *slaves; 5247 struct slave *slave = NULL; 5248 5249 switch (BOND_MODE(bond)) { 5250 case BOND_MODE_ROUNDROBIN: 5251 slave = bond_xmit_roundrobin_slave_get(bond, skb); 5252 break; 5253 case BOND_MODE_ACTIVEBACKUP: 5254 slave = bond_xmit_activebackup_slave_get(bond); 5255 break; 5256 case BOND_MODE_8023AD: 5257 case BOND_MODE_XOR: 5258 if (all_slaves) 5259 slaves = rcu_dereference(bond->all_slaves); 5260 else 5261 slaves = rcu_dereference(bond->usable_slaves); 5262 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves); 5263 break; 5264 case BOND_MODE_BROADCAST: 5265 break; 5266 case BOND_MODE_ALB: 5267 slave = bond_xmit_alb_slave_get(bond, skb); 5268 break; 5269 case BOND_MODE_TLB: 5270 slave = bond_xmit_tlb_slave_get(bond, skb); 5271 break; 5272 default: 5273 /* Should never happen, mode already checked */ 5274 WARN_ONCE(true, "Unknown bonding mode"); 5275 break; 5276 } 5277 5278 if (slave) 5279 return slave->dev; 5280 return NULL; 5281 } 5282 5283 static void bond_sk_to_flow(struct sock *sk, struct flow_keys *flow) 5284 { 5285 switch (sk->sk_family) { 5286 #if IS_ENABLED(CONFIG_IPV6) 5287 case AF_INET6: 5288 if (ipv6_only_sock(sk) || 5289 ipv6_addr_type(&sk->sk_v6_daddr) != IPV6_ADDR_MAPPED) { 5290 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; 5291 flow->addrs.v6addrs.src = inet6_sk(sk)->saddr; 5292 flow->addrs.v6addrs.dst = sk->sk_v6_daddr; 5293 break; 5294 } 5295 fallthrough; 5296 #endif 5297 default: /* AF_INET */ 5298 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; 5299 flow->addrs.v4addrs.src = inet_sk(sk)->inet_rcv_saddr; 5300 flow->addrs.v4addrs.dst = inet_sk(sk)->inet_daddr; 5301 break; 5302 } 5303 5304 flow->ports.src = inet_sk(sk)->inet_sport; 5305 flow->ports.dst = inet_sk(sk)->inet_dport; 5306 } 5307 5308 /** 5309 * bond_sk_hash_l34 - generate a hash value based on the socket's L3 and L4 fields 5310 * @sk: socket to use for headers 5311 * 5312 * This function will extract the necessary field from the socket and use 5313 * them to generate a hash based on the LAYER34 xmit_policy. 5314 * Assumes that sk is a TCP or UDP socket. 5315 */ 5316 static u32 bond_sk_hash_l34(struct sock *sk) 5317 { 5318 struct flow_keys flow; 5319 u32 hash; 5320 5321 bond_sk_to_flow(sk, &flow); 5322 5323 /* L4 */ 5324 memcpy(&hash, &flow.ports.ports, sizeof(hash)); 5325 /* L3 */ 5326 return bond_ip_hash(hash, &flow, BOND_XMIT_POLICY_LAYER34); 5327 } 5328 5329 static struct net_device *__bond_sk_get_lower_dev(struct bonding *bond, 5330 struct sock *sk) 5331 { 5332 struct bond_up_slave *slaves; 5333 struct slave *slave; 5334 unsigned int count; 5335 u32 hash; 5336 5337 slaves = rcu_dereference(bond->usable_slaves); 5338 count = slaves ? READ_ONCE(slaves->count) : 0; 5339 if (unlikely(!count)) 5340 return NULL; 5341 5342 hash = bond_sk_hash_l34(sk); 5343 slave = slaves->arr[hash % count]; 5344 5345 return slave->dev; 5346 } 5347 5348 static struct net_device *bond_sk_get_lower_dev(struct net_device *dev, 5349 struct sock *sk) 5350 { 5351 struct bonding *bond = netdev_priv(dev); 5352 struct net_device *lower = NULL; 5353 5354 rcu_read_lock(); 5355 if (bond_sk_check(bond)) 5356 lower = __bond_sk_get_lower_dev(bond, sk); 5357 rcu_read_unlock(); 5358 5359 return lower; 5360 } 5361 5362 #if IS_ENABLED(CONFIG_TLS_DEVICE) 5363 static netdev_tx_t bond_tls_device_xmit(struct bonding *bond, struct sk_buff *skb, 5364 struct net_device *dev) 5365 { 5366 struct net_device *tls_netdev = rcu_dereference(tls_get_ctx(skb->sk)->netdev); 5367 5368 /* tls_netdev might become NULL, even if tls_is_sk_tx_device_offloaded 5369 * was true, if tls_device_down is running in parallel, but it's OK, 5370 * because bond_get_slave_by_dev has a NULL check. 5371 */ 5372 if (likely(bond_get_slave_by_dev(bond, tls_netdev))) 5373 return bond_dev_queue_xmit(bond, skb, tls_netdev); 5374 return bond_tx_drop(dev, skb); 5375 } 5376 #endif 5377 5378 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 5379 { 5380 struct bonding *bond = netdev_priv(dev); 5381 5382 if (bond_should_override_tx_queue(bond) && 5383 !bond_slave_override(bond, skb)) 5384 return NETDEV_TX_OK; 5385 5386 #if IS_ENABLED(CONFIG_TLS_DEVICE) 5387 if (skb->sk && tls_is_sk_tx_device_offloaded(skb->sk)) 5388 return bond_tls_device_xmit(bond, skb, dev); 5389 #endif 5390 5391 switch (BOND_MODE(bond)) { 5392 case BOND_MODE_ROUNDROBIN: 5393 return bond_xmit_roundrobin(skb, dev); 5394 case BOND_MODE_ACTIVEBACKUP: 5395 return bond_xmit_activebackup(skb, dev); 5396 case BOND_MODE_8023AD: 5397 case BOND_MODE_XOR: 5398 return bond_3ad_xor_xmit(skb, dev); 5399 case BOND_MODE_BROADCAST: 5400 return bond_xmit_broadcast(skb, dev); 5401 case BOND_MODE_ALB: 5402 return bond_alb_xmit(skb, dev); 5403 case BOND_MODE_TLB: 5404 return bond_tlb_xmit(skb, dev); 5405 default: 5406 /* Should never happen, mode already checked */ 5407 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond)); 5408 WARN_ON_ONCE(1); 5409 return bond_tx_drop(dev, skb); 5410 } 5411 } 5412 5413 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 5414 { 5415 struct bonding *bond = netdev_priv(dev); 5416 netdev_tx_t ret = NETDEV_TX_OK; 5417 5418 /* If we risk deadlock from transmitting this in the 5419 * netpoll path, tell netpoll to queue the frame for later tx 5420 */ 5421 if (unlikely(is_netpoll_tx_blocked(dev))) 5422 return NETDEV_TX_BUSY; 5423 5424 rcu_read_lock(); 5425 if (bond_has_slaves(bond)) 5426 ret = __bond_start_xmit(skb, dev); 5427 else 5428 ret = bond_tx_drop(dev, skb); 5429 rcu_read_unlock(); 5430 5431 return ret; 5432 } 5433 5434 static struct net_device * 5435 bond_xdp_get_xmit_slave(struct net_device *bond_dev, struct xdp_buff *xdp) 5436 { 5437 struct bonding *bond = netdev_priv(bond_dev); 5438 struct slave *slave; 5439 5440 /* Caller needs to hold rcu_read_lock() */ 5441 5442 switch (BOND_MODE(bond)) { 5443 case BOND_MODE_ROUNDROBIN: 5444 slave = bond_xdp_xmit_roundrobin_slave_get(bond, xdp); 5445 break; 5446 5447 case BOND_MODE_ACTIVEBACKUP: 5448 slave = bond_xmit_activebackup_slave_get(bond); 5449 break; 5450 5451 case BOND_MODE_8023AD: 5452 case BOND_MODE_XOR: 5453 slave = bond_xdp_xmit_3ad_xor_slave_get(bond, xdp); 5454 break; 5455 5456 default: 5457 /* Should never happen. Mode guarded by bond_xdp_check() */ 5458 netdev_err(bond_dev, "Unknown bonding mode %d for xdp xmit\n", BOND_MODE(bond)); 5459 WARN_ON_ONCE(1); 5460 return NULL; 5461 } 5462 5463 if (slave) 5464 return slave->dev; 5465 5466 return NULL; 5467 } 5468 5469 static int bond_xdp_xmit(struct net_device *bond_dev, 5470 int n, struct xdp_frame **frames, u32 flags) 5471 { 5472 int nxmit, err = -ENXIO; 5473 5474 rcu_read_lock(); 5475 5476 for (nxmit = 0; nxmit < n; nxmit++) { 5477 struct xdp_frame *frame = frames[nxmit]; 5478 struct xdp_frame *frames1[] = {frame}; 5479 struct net_device *slave_dev; 5480 struct xdp_buff xdp; 5481 5482 xdp_convert_frame_to_buff(frame, &xdp); 5483 5484 slave_dev = bond_xdp_get_xmit_slave(bond_dev, &xdp); 5485 if (!slave_dev) { 5486 err = -ENXIO; 5487 break; 5488 } 5489 5490 err = slave_dev->netdev_ops->ndo_xdp_xmit(slave_dev, 1, frames1, flags); 5491 if (err < 1) 5492 break; 5493 } 5494 5495 rcu_read_unlock(); 5496 5497 /* If error happened on the first frame then we can pass the error up, otherwise 5498 * report the number of frames that were xmitted. 5499 */ 5500 if (err < 0) 5501 return (nxmit == 0 ? err : nxmit); 5502 5503 return nxmit; 5504 } 5505 5506 static int bond_xdp_set(struct net_device *dev, struct bpf_prog *prog, 5507 struct netlink_ext_ack *extack) 5508 { 5509 struct bonding *bond = netdev_priv(dev); 5510 struct list_head *iter; 5511 struct slave *slave, *rollback_slave; 5512 struct bpf_prog *old_prog; 5513 struct netdev_bpf xdp = { 5514 .command = XDP_SETUP_PROG, 5515 .flags = 0, 5516 .prog = prog, 5517 .extack = extack, 5518 }; 5519 int err; 5520 5521 ASSERT_RTNL(); 5522 5523 if (!bond_xdp_check(bond)) 5524 return -EOPNOTSUPP; 5525 5526 old_prog = bond->xdp_prog; 5527 bond->xdp_prog = prog; 5528 5529 bond_for_each_slave(bond, slave, iter) { 5530 struct net_device *slave_dev = slave->dev; 5531 5532 if (!slave_dev->netdev_ops->ndo_bpf || 5533 !slave_dev->netdev_ops->ndo_xdp_xmit) { 5534 SLAVE_NL_ERR(dev, slave_dev, extack, 5535 "Slave device does not support XDP"); 5536 err = -EOPNOTSUPP; 5537 goto err; 5538 } 5539 5540 if (dev_xdp_prog_count(slave_dev) > 0) { 5541 SLAVE_NL_ERR(dev, slave_dev, extack, 5542 "Slave has XDP program loaded, please unload before enslaving"); 5543 err = -EOPNOTSUPP; 5544 goto err; 5545 } 5546 5547 err = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 5548 if (err < 0) { 5549 /* ndo_bpf() sets extack error message */ 5550 slave_err(dev, slave_dev, "Error %d calling ndo_bpf\n", err); 5551 goto err; 5552 } 5553 if (prog) 5554 bpf_prog_inc(prog); 5555 } 5556 5557 if (prog) { 5558 static_branch_inc(&bpf_master_redirect_enabled_key); 5559 } else if (old_prog) { 5560 bpf_prog_put(old_prog); 5561 static_branch_dec(&bpf_master_redirect_enabled_key); 5562 } 5563 5564 return 0; 5565 5566 err: 5567 /* unwind the program changes */ 5568 bond->xdp_prog = old_prog; 5569 xdp.prog = old_prog; 5570 xdp.extack = NULL; /* do not overwrite original error */ 5571 5572 bond_for_each_slave(bond, rollback_slave, iter) { 5573 struct net_device *slave_dev = rollback_slave->dev; 5574 int err_unwind; 5575 5576 if (slave == rollback_slave) 5577 break; 5578 5579 err_unwind = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 5580 if (err_unwind < 0) 5581 slave_err(dev, slave_dev, 5582 "Error %d when unwinding XDP program change\n", err_unwind); 5583 else if (xdp.prog) 5584 bpf_prog_inc(xdp.prog); 5585 } 5586 return err; 5587 } 5588 5589 static int bond_xdp(struct net_device *dev, struct netdev_bpf *xdp) 5590 { 5591 switch (xdp->command) { 5592 case XDP_SETUP_PROG: 5593 return bond_xdp_set(dev, xdp->prog, xdp->extack); 5594 default: 5595 return -EINVAL; 5596 } 5597 } 5598 5599 static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed) 5600 { 5601 if (speed == 0 || speed == SPEED_UNKNOWN) 5602 speed = slave->speed; 5603 else 5604 speed = min(speed, slave->speed); 5605 5606 return speed; 5607 } 5608 5609 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev, 5610 struct ethtool_link_ksettings *cmd) 5611 { 5612 struct bonding *bond = netdev_priv(bond_dev); 5613 struct list_head *iter; 5614 struct slave *slave; 5615 u32 speed = 0; 5616 5617 cmd->base.duplex = DUPLEX_UNKNOWN; 5618 cmd->base.port = PORT_OTHER; 5619 5620 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we 5621 * do not need to check mode. Though link speed might not represent 5622 * the true receive or transmit bandwidth (not all modes are symmetric) 5623 * this is an accurate maximum. 5624 */ 5625 bond_for_each_slave(bond, slave, iter) { 5626 if (bond_slave_can_tx(slave)) { 5627 if (slave->speed != SPEED_UNKNOWN) { 5628 if (BOND_MODE(bond) == BOND_MODE_BROADCAST) 5629 speed = bond_mode_bcast_speed(slave, 5630 speed); 5631 else 5632 speed += slave->speed; 5633 } 5634 if (cmd->base.duplex == DUPLEX_UNKNOWN && 5635 slave->duplex != DUPLEX_UNKNOWN) 5636 cmd->base.duplex = slave->duplex; 5637 } 5638 } 5639 cmd->base.speed = speed ? : SPEED_UNKNOWN; 5640 5641 return 0; 5642 } 5643 5644 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 5645 struct ethtool_drvinfo *drvinfo) 5646 { 5647 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver)); 5648 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d", 5649 BOND_ABI_VERSION); 5650 } 5651 5652 static int bond_ethtool_get_ts_info(struct net_device *bond_dev, 5653 struct ethtool_ts_info *info) 5654 { 5655 struct bonding *bond = netdev_priv(bond_dev); 5656 const struct ethtool_ops *ops; 5657 struct net_device *real_dev; 5658 struct phy_device *phydev; 5659 int ret = 0; 5660 5661 rcu_read_lock(); 5662 real_dev = bond_option_active_slave_get_rcu(bond); 5663 dev_hold(real_dev); 5664 rcu_read_unlock(); 5665 5666 if (real_dev) { 5667 ops = real_dev->ethtool_ops; 5668 phydev = real_dev->phydev; 5669 5670 if (phy_has_tsinfo(phydev)) { 5671 ret = phy_ts_info(phydev, info); 5672 goto out; 5673 } else if (ops->get_ts_info) { 5674 ret = ops->get_ts_info(real_dev, info); 5675 goto out; 5676 } 5677 } 5678 5679 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE | 5680 SOF_TIMESTAMPING_SOFTWARE; 5681 info->phc_index = -1; 5682 5683 out: 5684 dev_put(real_dev); 5685 return ret; 5686 } 5687 5688 static const struct ethtool_ops bond_ethtool_ops = { 5689 .get_drvinfo = bond_ethtool_get_drvinfo, 5690 .get_link = ethtool_op_get_link, 5691 .get_link_ksettings = bond_ethtool_get_link_ksettings, 5692 .get_ts_info = bond_ethtool_get_ts_info, 5693 }; 5694 5695 static const struct net_device_ops bond_netdev_ops = { 5696 .ndo_init = bond_init, 5697 .ndo_uninit = bond_uninit, 5698 .ndo_open = bond_open, 5699 .ndo_stop = bond_close, 5700 .ndo_start_xmit = bond_start_xmit, 5701 .ndo_select_queue = bond_select_queue, 5702 .ndo_get_stats64 = bond_get_stats, 5703 .ndo_eth_ioctl = bond_eth_ioctl, 5704 .ndo_siocbond = bond_do_ioctl, 5705 .ndo_siocdevprivate = bond_siocdevprivate, 5706 .ndo_change_rx_flags = bond_change_rx_flags, 5707 .ndo_set_rx_mode = bond_set_rx_mode, 5708 .ndo_change_mtu = bond_change_mtu, 5709 .ndo_set_mac_address = bond_set_mac_address, 5710 .ndo_neigh_setup = bond_neigh_setup, 5711 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 5712 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 5713 #ifdef CONFIG_NET_POLL_CONTROLLER 5714 .ndo_netpoll_setup = bond_netpoll_setup, 5715 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 5716 .ndo_poll_controller = bond_poll_controller, 5717 #endif 5718 .ndo_add_slave = bond_enslave, 5719 .ndo_del_slave = bond_release, 5720 .ndo_fix_features = bond_fix_features, 5721 .ndo_features_check = passthru_features_check, 5722 .ndo_get_xmit_slave = bond_xmit_get_slave, 5723 .ndo_sk_get_lower_dev = bond_sk_get_lower_dev, 5724 .ndo_bpf = bond_xdp, 5725 .ndo_xdp_xmit = bond_xdp_xmit, 5726 .ndo_xdp_get_xmit_slave = bond_xdp_get_xmit_slave, 5727 }; 5728 5729 static const struct device_type bond_type = { 5730 .name = "bond", 5731 }; 5732 5733 static void bond_destructor(struct net_device *bond_dev) 5734 { 5735 struct bonding *bond = netdev_priv(bond_dev); 5736 5737 if (bond->wq) 5738 destroy_workqueue(bond->wq); 5739 5740 if (bond->rr_tx_counter) 5741 free_percpu(bond->rr_tx_counter); 5742 } 5743 5744 void bond_setup(struct net_device *bond_dev) 5745 { 5746 struct bonding *bond = netdev_priv(bond_dev); 5747 5748 spin_lock_init(&bond->mode_lock); 5749 bond->params = bonding_defaults; 5750 5751 /* Initialize pointers */ 5752 bond->dev = bond_dev; 5753 5754 /* Initialize the device entry points */ 5755 ether_setup(bond_dev); 5756 bond_dev->max_mtu = ETH_MAX_MTU; 5757 bond_dev->netdev_ops = &bond_netdev_ops; 5758 bond_dev->ethtool_ops = &bond_ethtool_ops; 5759 5760 bond_dev->needs_free_netdev = true; 5761 bond_dev->priv_destructor = bond_destructor; 5762 5763 SET_NETDEV_DEVTYPE(bond_dev, &bond_type); 5764 5765 /* Initialize the device options */ 5766 bond_dev->flags |= IFF_MASTER; 5767 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE; 5768 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 5769 5770 #ifdef CONFIG_XFRM_OFFLOAD 5771 /* set up xfrm device ops (only supported in active-backup right now) */ 5772 bond_dev->xfrmdev_ops = &bond_xfrmdev_ops; 5773 INIT_LIST_HEAD(&bond->ipsec_list); 5774 spin_lock_init(&bond->ipsec_lock); 5775 #endif /* CONFIG_XFRM_OFFLOAD */ 5776 5777 /* don't acquire bond device's netif_tx_lock when transmitting */ 5778 bond_dev->features |= NETIF_F_LLTX; 5779 5780 /* By default, we declare the bond to be fully 5781 * VLAN hardware accelerated capable. Special 5782 * care is taken in the various xmit functions 5783 * when there are slaves that are not hw accel 5784 * capable 5785 */ 5786 5787 /* Don't allow bond devices to change network namespaces. */ 5788 bond_dev->features |= NETIF_F_NETNS_LOCAL; 5789 5790 bond_dev->hw_features = BOND_VLAN_FEATURES | 5791 NETIF_F_HW_VLAN_CTAG_RX | 5792 NETIF_F_HW_VLAN_CTAG_FILTER; 5793 5794 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL; 5795 bond_dev->features |= bond_dev->hw_features; 5796 bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; 5797 #ifdef CONFIG_XFRM_OFFLOAD 5798 bond_dev->hw_features |= BOND_XFRM_FEATURES; 5799 /* Only enable XFRM features if this is an active-backup config */ 5800 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 5801 bond_dev->features |= BOND_XFRM_FEATURES; 5802 #endif /* CONFIG_XFRM_OFFLOAD */ 5803 #if IS_ENABLED(CONFIG_TLS_DEVICE) 5804 if (bond_sk_check(bond)) 5805 bond_dev->features |= BOND_TLS_FEATURES; 5806 #endif 5807 } 5808 5809 /* Destroy a bonding device. 5810 * Must be under rtnl_lock when this function is called. 5811 */ 5812 static void bond_uninit(struct net_device *bond_dev) 5813 { 5814 struct bonding *bond = netdev_priv(bond_dev); 5815 struct bond_up_slave *usable, *all; 5816 struct list_head *iter; 5817 struct slave *slave; 5818 5819 bond_netpoll_cleanup(bond_dev); 5820 5821 /* Release the bonded slaves */ 5822 bond_for_each_slave(bond, slave, iter) 5823 __bond_release_one(bond_dev, slave->dev, true, true); 5824 netdev_info(bond_dev, "Released all slaves\n"); 5825 5826 usable = rtnl_dereference(bond->usable_slaves); 5827 if (usable) { 5828 RCU_INIT_POINTER(bond->usable_slaves, NULL); 5829 kfree_rcu(usable, rcu); 5830 } 5831 5832 all = rtnl_dereference(bond->all_slaves); 5833 if (all) { 5834 RCU_INIT_POINTER(bond->all_slaves, NULL); 5835 kfree_rcu(all, rcu); 5836 } 5837 5838 list_del(&bond->bond_list); 5839 5840 bond_debug_unregister(bond); 5841 } 5842 5843 /*------------------------- Module initialization ---------------------------*/ 5844 5845 static int bond_check_params(struct bond_params *params) 5846 { 5847 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i; 5848 struct bond_opt_value newval; 5849 const struct bond_opt_value *valptr; 5850 int arp_all_targets_value = 0; 5851 u16 ad_actor_sys_prio = 0; 5852 u16 ad_user_port_key = 0; 5853 __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 }; 5854 int arp_ip_count; 5855 int bond_mode = BOND_MODE_ROUNDROBIN; 5856 int xmit_hashtype = BOND_XMIT_POLICY_LAYER2; 5857 int lacp_fast = 0; 5858 int tlb_dynamic_lb; 5859 5860 /* Convert string parameters. */ 5861 if (mode) { 5862 bond_opt_initstr(&newval, mode); 5863 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval); 5864 if (!valptr) { 5865 pr_err("Error: Invalid bonding mode \"%s\"\n", mode); 5866 return -EINVAL; 5867 } 5868 bond_mode = valptr->value; 5869 } 5870 5871 if (xmit_hash_policy) { 5872 if (bond_mode == BOND_MODE_ROUNDROBIN || 5873 bond_mode == BOND_MODE_ACTIVEBACKUP || 5874 bond_mode == BOND_MODE_BROADCAST) { 5875 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 5876 bond_mode_name(bond_mode)); 5877 } else { 5878 bond_opt_initstr(&newval, xmit_hash_policy); 5879 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH), 5880 &newval); 5881 if (!valptr) { 5882 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 5883 xmit_hash_policy); 5884 return -EINVAL; 5885 } 5886 xmit_hashtype = valptr->value; 5887 } 5888 } 5889 5890 if (lacp_rate) { 5891 if (bond_mode != BOND_MODE_8023AD) { 5892 pr_info("lacp_rate param is irrelevant in mode %s\n", 5893 bond_mode_name(bond_mode)); 5894 } else { 5895 bond_opt_initstr(&newval, lacp_rate); 5896 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE), 5897 &newval); 5898 if (!valptr) { 5899 pr_err("Error: Invalid lacp rate \"%s\"\n", 5900 lacp_rate); 5901 return -EINVAL; 5902 } 5903 lacp_fast = valptr->value; 5904 } 5905 } 5906 5907 if (ad_select) { 5908 bond_opt_initstr(&newval, ad_select); 5909 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT), 5910 &newval); 5911 if (!valptr) { 5912 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select); 5913 return -EINVAL; 5914 } 5915 params->ad_select = valptr->value; 5916 if (bond_mode != BOND_MODE_8023AD) 5917 pr_warn("ad_select param only affects 802.3ad mode\n"); 5918 } else { 5919 params->ad_select = BOND_AD_STABLE; 5920 } 5921 5922 if (max_bonds < 0) { 5923 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 5924 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 5925 max_bonds = BOND_DEFAULT_MAX_BONDS; 5926 } 5927 5928 if (miimon < 0) { 5929 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n", 5930 miimon, INT_MAX); 5931 miimon = 0; 5932 } 5933 5934 if (updelay < 0) { 5935 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 5936 updelay, INT_MAX); 5937 updelay = 0; 5938 } 5939 5940 if (downdelay < 0) { 5941 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 5942 downdelay, INT_MAX); 5943 downdelay = 0; 5944 } 5945 5946 if ((use_carrier != 0) && (use_carrier != 1)) { 5947 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 5948 use_carrier); 5949 use_carrier = 1; 5950 } 5951 5952 if (num_peer_notif < 0 || num_peer_notif > 255) { 5953 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 5954 num_peer_notif); 5955 num_peer_notif = 1; 5956 } 5957 5958 /* reset values for 802.3ad/TLB/ALB */ 5959 if (!bond_mode_uses_arp(bond_mode)) { 5960 if (!miimon) { 5961 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"); 5962 pr_warn("Forcing miimon to 100msec\n"); 5963 miimon = BOND_DEFAULT_MIIMON; 5964 } 5965 } 5966 5967 if (tx_queues < 1 || tx_queues > 255) { 5968 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n", 5969 tx_queues, BOND_DEFAULT_TX_QUEUES); 5970 tx_queues = BOND_DEFAULT_TX_QUEUES; 5971 } 5972 5973 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 5974 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n", 5975 all_slaves_active); 5976 all_slaves_active = 0; 5977 } 5978 5979 if (resend_igmp < 0 || resend_igmp > 255) { 5980 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n", 5981 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 5982 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 5983 } 5984 5985 bond_opt_initval(&newval, packets_per_slave); 5986 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) { 5987 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n", 5988 packets_per_slave, USHRT_MAX); 5989 packets_per_slave = 1; 5990 } 5991 5992 if (bond_mode == BOND_MODE_ALB) { 5993 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", 5994 updelay); 5995 } 5996 5997 if (!miimon) { 5998 if (updelay || downdelay) { 5999 /* just warn the user the up/down delay will have 6000 * no effect since miimon is zero... 6001 */ 6002 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", 6003 updelay, downdelay); 6004 } 6005 } else { 6006 /* don't allow arp monitoring */ 6007 if (arp_interval) { 6008 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 6009 miimon, arp_interval); 6010 arp_interval = 0; 6011 } 6012 6013 if ((updelay % miimon) != 0) { 6014 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 6015 updelay, miimon, (updelay / miimon) * miimon); 6016 } 6017 6018 updelay /= miimon; 6019 6020 if ((downdelay % miimon) != 0) { 6021 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 6022 downdelay, miimon, 6023 (downdelay / miimon) * miimon); 6024 } 6025 6026 downdelay /= miimon; 6027 } 6028 6029 if (arp_interval < 0) { 6030 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n", 6031 arp_interval, INT_MAX); 6032 arp_interval = 0; 6033 } 6034 6035 for (arp_ip_count = 0, i = 0; 6036 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) { 6037 __be32 ip; 6038 6039 /* not a complete check, but good enough to catch mistakes */ 6040 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) || 6041 !bond_is_ip_target_ok(ip)) { 6042 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 6043 arp_ip_target[i]); 6044 arp_interval = 0; 6045 } else { 6046 if (bond_get_targets_ip(arp_target, ip) == -1) 6047 arp_target[arp_ip_count++] = ip; 6048 else 6049 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n", 6050 &ip); 6051 } 6052 } 6053 6054 if (arp_interval && !arp_ip_count) { 6055 /* don't allow arping if no arp_ip_target given... */ 6056 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 6057 arp_interval); 6058 arp_interval = 0; 6059 } 6060 6061 if (arp_validate) { 6062 if (!arp_interval) { 6063 pr_err("arp_validate requires arp_interval\n"); 6064 return -EINVAL; 6065 } 6066 6067 bond_opt_initstr(&newval, arp_validate); 6068 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE), 6069 &newval); 6070 if (!valptr) { 6071 pr_err("Error: invalid arp_validate \"%s\"\n", 6072 arp_validate); 6073 return -EINVAL; 6074 } 6075 arp_validate_value = valptr->value; 6076 } else { 6077 arp_validate_value = 0; 6078 } 6079 6080 if (arp_all_targets) { 6081 bond_opt_initstr(&newval, arp_all_targets); 6082 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS), 6083 &newval); 6084 if (!valptr) { 6085 pr_err("Error: invalid arp_all_targets_value \"%s\"\n", 6086 arp_all_targets); 6087 arp_all_targets_value = 0; 6088 } else { 6089 arp_all_targets_value = valptr->value; 6090 } 6091 } 6092 6093 if (miimon) { 6094 pr_info("MII link monitoring set to %d ms\n", miimon); 6095 } else if (arp_interval) { 6096 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE, 6097 arp_validate_value); 6098 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 6099 arp_interval, valptr->string, arp_ip_count); 6100 6101 for (i = 0; i < arp_ip_count; i++) 6102 pr_cont(" %s", arp_ip_target[i]); 6103 6104 pr_cont("\n"); 6105 6106 } else if (max_bonds) { 6107 /* miimon and arp_interval not set, we need one so things 6108 * work as expected, see bonding.txt for details 6109 */ 6110 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"); 6111 } 6112 6113 if (primary && !bond_mode_uses_primary(bond_mode)) { 6114 /* currently, using a primary only makes sense 6115 * in active backup, TLB or ALB modes 6116 */ 6117 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n", 6118 primary, bond_mode_name(bond_mode)); 6119 primary = NULL; 6120 } 6121 6122 if (primary && primary_reselect) { 6123 bond_opt_initstr(&newval, primary_reselect); 6124 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT), 6125 &newval); 6126 if (!valptr) { 6127 pr_err("Error: Invalid primary_reselect \"%s\"\n", 6128 primary_reselect); 6129 return -EINVAL; 6130 } 6131 primary_reselect_value = valptr->value; 6132 } else { 6133 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 6134 } 6135 6136 if (fail_over_mac) { 6137 bond_opt_initstr(&newval, fail_over_mac); 6138 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC), 6139 &newval); 6140 if (!valptr) { 6141 pr_err("Error: invalid fail_over_mac \"%s\"\n", 6142 fail_over_mac); 6143 return -EINVAL; 6144 } 6145 fail_over_mac_value = valptr->value; 6146 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 6147 pr_warn("Warning: fail_over_mac only affects active-backup mode\n"); 6148 } else { 6149 fail_over_mac_value = BOND_FOM_NONE; 6150 } 6151 6152 bond_opt_initstr(&newval, "default"); 6153 valptr = bond_opt_parse( 6154 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO), 6155 &newval); 6156 if (!valptr) { 6157 pr_err("Error: No ad_actor_sys_prio default value"); 6158 return -EINVAL; 6159 } 6160 ad_actor_sys_prio = valptr->value; 6161 6162 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY), 6163 &newval); 6164 if (!valptr) { 6165 pr_err("Error: No ad_user_port_key default value"); 6166 return -EINVAL; 6167 } 6168 ad_user_port_key = valptr->value; 6169 6170 bond_opt_initstr(&newval, "default"); 6171 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval); 6172 if (!valptr) { 6173 pr_err("Error: No tlb_dynamic_lb default value"); 6174 return -EINVAL; 6175 } 6176 tlb_dynamic_lb = valptr->value; 6177 6178 if (lp_interval == 0) { 6179 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n", 6180 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL); 6181 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 6182 } 6183 6184 /* fill params struct with the proper values */ 6185 params->mode = bond_mode; 6186 params->xmit_policy = xmit_hashtype; 6187 params->miimon = miimon; 6188 params->num_peer_notif = num_peer_notif; 6189 params->arp_interval = arp_interval; 6190 params->arp_validate = arp_validate_value; 6191 params->arp_all_targets = arp_all_targets_value; 6192 params->missed_max = 2; 6193 params->updelay = updelay; 6194 params->downdelay = downdelay; 6195 params->peer_notif_delay = 0; 6196 params->use_carrier = use_carrier; 6197 params->lacp_active = 1; 6198 params->lacp_fast = lacp_fast; 6199 params->primary[0] = 0; 6200 params->primary_reselect = primary_reselect_value; 6201 params->fail_over_mac = fail_over_mac_value; 6202 params->tx_queues = tx_queues; 6203 params->all_slaves_active = all_slaves_active; 6204 params->resend_igmp = resend_igmp; 6205 params->min_links = min_links; 6206 params->lp_interval = lp_interval; 6207 params->packets_per_slave = packets_per_slave; 6208 params->tlb_dynamic_lb = tlb_dynamic_lb; 6209 params->ad_actor_sys_prio = ad_actor_sys_prio; 6210 eth_zero_addr(params->ad_actor_system); 6211 params->ad_user_port_key = ad_user_port_key; 6212 if (packets_per_slave > 0) { 6213 params->reciprocal_packets_per_slave = 6214 reciprocal_value(packets_per_slave); 6215 } else { 6216 /* reciprocal_packets_per_slave is unused if 6217 * packets_per_slave is 0 or 1, just initialize it 6218 */ 6219 params->reciprocal_packets_per_slave = 6220 (struct reciprocal_value) { 0 }; 6221 } 6222 6223 if (primary) 6224 strscpy_pad(params->primary, primary, sizeof(params->primary)); 6225 6226 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 6227 #if IS_ENABLED(CONFIG_IPV6) 6228 memset(params->ns_targets, 0, sizeof(struct in6_addr) * BOND_MAX_NS_TARGETS); 6229 #endif 6230 6231 return 0; 6232 } 6233 6234 /* Called from registration process */ 6235 static int bond_init(struct net_device *bond_dev) 6236 { 6237 struct bonding *bond = netdev_priv(bond_dev); 6238 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 6239 6240 netdev_dbg(bond_dev, "Begin bond_init\n"); 6241 6242 bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM); 6243 if (!bond->wq) 6244 return -ENOMEM; 6245 6246 if (BOND_MODE(bond) == BOND_MODE_ROUNDROBIN) { 6247 bond->rr_tx_counter = alloc_percpu(u32); 6248 if (!bond->rr_tx_counter) { 6249 destroy_workqueue(bond->wq); 6250 bond->wq = NULL; 6251 return -ENOMEM; 6252 } 6253 } 6254 6255 spin_lock_init(&bond->stats_lock); 6256 netdev_lockdep_set_classes(bond_dev); 6257 6258 list_add_tail(&bond->bond_list, &bn->dev_list); 6259 6260 bond_prepare_sysfs_group(bond); 6261 6262 bond_debug_register(bond); 6263 6264 /* Ensure valid dev_addr */ 6265 if (is_zero_ether_addr(bond_dev->dev_addr) && 6266 bond_dev->addr_assign_type == NET_ADDR_PERM) 6267 eth_hw_addr_random(bond_dev); 6268 6269 return 0; 6270 } 6271 6272 unsigned int bond_get_num_tx_queues(void) 6273 { 6274 return tx_queues; 6275 } 6276 6277 /* Create a new bond based on the specified name and bonding parameters. 6278 * If name is NULL, obtain a suitable "bond%d" name for us. 6279 * Caller must NOT hold rtnl_lock; we need to release it here before we 6280 * set up our sysfs entries. 6281 */ 6282 int bond_create(struct net *net, const char *name) 6283 { 6284 struct net_device *bond_dev; 6285 struct bonding *bond; 6286 int res = -ENOMEM; 6287 6288 rtnl_lock(); 6289 6290 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 6291 name ? name : "bond%d", NET_NAME_UNKNOWN, 6292 bond_setup, tx_queues); 6293 if (!bond_dev) 6294 goto out; 6295 6296 bond = netdev_priv(bond_dev); 6297 dev_net_set(bond_dev, net); 6298 bond_dev->rtnl_link_ops = &bond_link_ops; 6299 6300 res = register_netdevice(bond_dev); 6301 if (res < 0) { 6302 free_netdev(bond_dev); 6303 goto out; 6304 } 6305 6306 netif_carrier_off(bond_dev); 6307 6308 bond_work_init_all(bond); 6309 6310 out: 6311 rtnl_unlock(); 6312 return res; 6313 } 6314 6315 static int __net_init bond_net_init(struct net *net) 6316 { 6317 struct bond_net *bn = net_generic(net, bond_net_id); 6318 6319 bn->net = net; 6320 INIT_LIST_HEAD(&bn->dev_list); 6321 6322 bond_create_proc_dir(bn); 6323 bond_create_sysfs(bn); 6324 6325 return 0; 6326 } 6327 6328 static void __net_exit bond_net_exit_batch(struct list_head *net_list) 6329 { 6330 struct bond_net *bn; 6331 struct net *net; 6332 LIST_HEAD(list); 6333 6334 list_for_each_entry(net, net_list, exit_list) { 6335 bn = net_generic(net, bond_net_id); 6336 bond_destroy_sysfs(bn); 6337 } 6338 6339 /* Kill off any bonds created after unregistering bond rtnl ops */ 6340 rtnl_lock(); 6341 list_for_each_entry(net, net_list, exit_list) { 6342 struct bonding *bond, *tmp_bond; 6343 6344 bn = net_generic(net, bond_net_id); 6345 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list) 6346 unregister_netdevice_queue(bond->dev, &list); 6347 } 6348 unregister_netdevice_many(&list); 6349 rtnl_unlock(); 6350 6351 list_for_each_entry(net, net_list, exit_list) { 6352 bn = net_generic(net, bond_net_id); 6353 bond_destroy_proc_dir(bn); 6354 } 6355 } 6356 6357 static struct pernet_operations bond_net_ops = { 6358 .init = bond_net_init, 6359 .exit_batch = bond_net_exit_batch, 6360 .id = &bond_net_id, 6361 .size = sizeof(struct bond_net), 6362 }; 6363 6364 static int __init bonding_init(void) 6365 { 6366 int i; 6367 int res; 6368 6369 res = bond_check_params(&bonding_defaults); 6370 if (res) 6371 goto out; 6372 6373 res = register_pernet_subsys(&bond_net_ops); 6374 if (res) 6375 goto out; 6376 6377 res = bond_netlink_init(); 6378 if (res) 6379 goto err_link; 6380 6381 bond_create_debugfs(); 6382 6383 for (i = 0; i < max_bonds; i++) { 6384 res = bond_create(&init_net, NULL); 6385 if (res) 6386 goto err; 6387 } 6388 6389 skb_flow_dissector_init(&flow_keys_bonding, 6390 flow_keys_bonding_keys, 6391 ARRAY_SIZE(flow_keys_bonding_keys)); 6392 6393 register_netdevice_notifier(&bond_netdev_notifier); 6394 out: 6395 return res; 6396 err: 6397 bond_destroy_debugfs(); 6398 bond_netlink_fini(); 6399 err_link: 6400 unregister_pernet_subsys(&bond_net_ops); 6401 goto out; 6402 6403 } 6404 6405 static void __exit bonding_exit(void) 6406 { 6407 unregister_netdevice_notifier(&bond_netdev_notifier); 6408 6409 bond_destroy_debugfs(); 6410 6411 bond_netlink_fini(); 6412 unregister_pernet_subsys(&bond_net_ops); 6413 6414 #ifdef CONFIG_NET_POLL_CONTROLLER 6415 /* Make sure we don't have an imbalance on our netpoll blocking */ 6416 WARN_ON(atomic_read(&netpoll_block_tx)); 6417 #endif 6418 } 6419 6420 module_init(bonding_init); 6421 module_exit(bonding_exit); 6422 MODULE_LICENSE("GPL"); 6423 MODULE_DESCRIPTION(DRV_DESCRIPTION); 6424 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 6425