1 /* 2 * originally based on the dummy device. 3 * 4 * Copyright 1999, Thomas Davis, tadavis@lbl.gov. 5 * Licensed under the GPL. Based on dummy.c, and eql.c devices. 6 * 7 * bonding.c: an Ethernet Bonding driver 8 * 9 * This is useful to talk to a Cisco EtherChannel compatible equipment: 10 * Cisco 5500 11 * Sun Trunking (Solaris) 12 * Alteon AceDirector Trunks 13 * Linux Bonding 14 * and probably many L2 switches ... 15 * 16 * How it works: 17 * ifconfig bond0 ipaddress netmask up 18 * will setup a network device, with an ip address. No mac address 19 * will be assigned at this time. The hw mac address will come from 20 * the first slave bonded to the channel. All slaves will then use 21 * this hw mac address. 22 * 23 * ifconfig bond0 down 24 * will release all slaves, marking them as down. 25 * 26 * ifenslave bond0 eth0 27 * will attach eth0 to bond0 as a slave. eth0 hw mac address will either 28 * a: be used as initial mac address 29 * b: if a hw mac address already is there, eth0's hw mac address 30 * will then be set from bond0. 31 * 32 */ 33 34 #include <linux/kernel.h> 35 #include <linux/module.h> 36 #include <linux/types.h> 37 #include <linux/fcntl.h> 38 #include <linux/filter.h> 39 #include <linux/interrupt.h> 40 #include <linux/ptrace.h> 41 #include <linux/ioport.h> 42 #include <linux/in.h> 43 #include <net/ip.h> 44 #include <linux/ip.h> 45 #include <linux/icmp.h> 46 #include <linux/icmpv6.h> 47 #include <linux/tcp.h> 48 #include <linux/udp.h> 49 #include <linux/slab.h> 50 #include <linux/string.h> 51 #include <linux/init.h> 52 #include <linux/timer.h> 53 #include <linux/socket.h> 54 #include <linux/ctype.h> 55 #include <linux/inet.h> 56 #include <linux/bitops.h> 57 #include <linux/io.h> 58 #include <asm/dma.h> 59 #include <linux/uaccess.h> 60 #include <linux/errno.h> 61 #include <linux/netdevice.h> 62 #include <linux/inetdevice.h> 63 #include <linux/igmp.h> 64 #include <linux/etherdevice.h> 65 #include <linux/skbuff.h> 66 #include <net/sock.h> 67 #include <linux/rtnetlink.h> 68 #include <linux/smp.h> 69 #include <linux/if_ether.h> 70 #include <net/arp.h> 71 #include <linux/mii.h> 72 #include <linux/ethtool.h> 73 #include <linux/if_vlan.h> 74 #include <linux/if_bonding.h> 75 #include <linux/phy.h> 76 #include <linux/jiffies.h> 77 #include <linux/preempt.h> 78 #include <net/route.h> 79 #include <net/net_namespace.h> 80 #include <net/netns/generic.h> 81 #include <net/pkt_sched.h> 82 #include <linux/rculist.h> 83 #include <net/flow_dissector.h> 84 #include <net/xfrm.h> 85 #include <net/bonding.h> 86 #include <net/bond_3ad.h> 87 #include <net/bond_alb.h> 88 #if IS_ENABLED(CONFIG_TLS_DEVICE) 89 #include <net/tls.h> 90 #endif 91 #include <net/ip6_route.h> 92 93 #include "bonding_priv.h" 94 95 /*---------------------------- Module parameters ----------------------------*/ 96 97 /* monitor all links that often (in milliseconds). <=0 disables monitoring */ 98 99 static int max_bonds = BOND_DEFAULT_MAX_BONDS; 100 static int tx_queues = BOND_DEFAULT_TX_QUEUES; 101 static int num_peer_notif = 1; 102 static int miimon; 103 static int updelay; 104 static int downdelay; 105 static int use_carrier = 1; 106 static char *mode; 107 static char *primary; 108 static char *primary_reselect; 109 static char *lacp_rate; 110 static int min_links; 111 static char *ad_select; 112 static char *xmit_hash_policy; 113 static int arp_interval; 114 static char *arp_ip_target[BOND_MAX_ARP_TARGETS]; 115 static char *arp_validate; 116 static char *arp_all_targets; 117 static char *fail_over_mac; 118 static int all_slaves_active; 119 static struct bond_params bonding_defaults; 120 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP; 121 static int packets_per_slave = 1; 122 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 123 124 module_param(max_bonds, int, 0); 125 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices"); 126 module_param(tx_queues, int, 0); 127 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)"); 128 module_param_named(num_grat_arp, num_peer_notif, int, 0644); 129 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on " 130 "failover event (alias of num_unsol_na)"); 131 module_param_named(num_unsol_na, num_peer_notif, int, 0644); 132 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on " 133 "failover event (alias of num_grat_arp)"); 134 module_param(miimon, int, 0); 135 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds"); 136 module_param(updelay, int, 0); 137 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds"); 138 module_param(downdelay, int, 0); 139 MODULE_PARM_DESC(downdelay, "Delay before considering link down, " 140 "in milliseconds"); 141 module_param(use_carrier, int, 0); 142 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; " 143 "0 for off, 1 for on (default)"); 144 module_param(mode, charp, 0); 145 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, " 146 "1 for active-backup, 2 for balance-xor, " 147 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, " 148 "6 for balance-alb"); 149 module_param(primary, charp, 0); 150 MODULE_PARM_DESC(primary, "Primary network device to use"); 151 module_param(primary_reselect, charp, 0); 152 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave " 153 "once it comes up; " 154 "0 for always (default), " 155 "1 for only if speed of primary is " 156 "better, " 157 "2 for only on active slave " 158 "failure"); 159 module_param(lacp_rate, charp, 0); 160 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; " 161 "0 for slow, 1 for fast"); 162 module_param(ad_select, charp, 0); 163 MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; " 164 "0 for stable (default), 1 for bandwidth, " 165 "2 for count"); 166 module_param(min_links, int, 0); 167 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier"); 168 169 module_param(xmit_hash_policy, charp, 0); 170 MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; " 171 "0 for layer 2 (default), 1 for layer 3+4, " 172 "2 for layer 2+3, 3 for encap layer 2+3, " 173 "4 for encap layer 3+4, 5 for vlan+srcmac"); 174 module_param(arp_interval, int, 0); 175 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds"); 176 module_param_array(arp_ip_target, charp, NULL, 0); 177 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form"); 178 module_param(arp_validate, charp, 0); 179 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; " 180 "0 for none (default), 1 for active, " 181 "2 for backup, 3 for all"); 182 module_param(arp_all_targets, charp, 0); 183 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all"); 184 module_param(fail_over_mac, charp, 0); 185 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to " 186 "the same MAC; 0 for none (default), " 187 "1 for active, 2 for follow"); 188 module_param(all_slaves_active, int, 0); 189 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface " 190 "by setting active flag for all slaves; " 191 "0 for never (default), 1 for always."); 192 module_param(resend_igmp, int, 0); 193 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on " 194 "link failure"); 195 module_param(packets_per_slave, int, 0); 196 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr " 197 "mode; 0 for a random slave, 1 packet per " 198 "slave (default), >1 packets per slave."); 199 module_param(lp_interval, uint, 0); 200 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where " 201 "the bonding driver sends learning packets to " 202 "each slaves peer switch. The default is 1."); 203 204 /*----------------------------- Global variables ----------------------------*/ 205 206 #ifdef CONFIG_NET_POLL_CONTROLLER 207 atomic_t netpoll_block_tx = ATOMIC_INIT(0); 208 #endif 209 210 unsigned int bond_net_id __read_mostly; 211 212 static const struct flow_dissector_key flow_keys_bonding_keys[] = { 213 { 214 .key_id = FLOW_DISSECTOR_KEY_CONTROL, 215 .offset = offsetof(struct flow_keys, control), 216 }, 217 { 218 .key_id = FLOW_DISSECTOR_KEY_BASIC, 219 .offset = offsetof(struct flow_keys, basic), 220 }, 221 { 222 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS, 223 .offset = offsetof(struct flow_keys, addrs.v4addrs), 224 }, 225 { 226 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS, 227 .offset = offsetof(struct flow_keys, addrs.v6addrs), 228 }, 229 { 230 .key_id = FLOW_DISSECTOR_KEY_TIPC, 231 .offset = offsetof(struct flow_keys, addrs.tipckey), 232 }, 233 { 234 .key_id = FLOW_DISSECTOR_KEY_PORTS, 235 .offset = offsetof(struct flow_keys, ports), 236 }, 237 { 238 .key_id = FLOW_DISSECTOR_KEY_ICMP, 239 .offset = offsetof(struct flow_keys, icmp), 240 }, 241 { 242 .key_id = FLOW_DISSECTOR_KEY_VLAN, 243 .offset = offsetof(struct flow_keys, vlan), 244 }, 245 { 246 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL, 247 .offset = offsetof(struct flow_keys, tags), 248 }, 249 { 250 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID, 251 .offset = offsetof(struct flow_keys, keyid), 252 }, 253 }; 254 255 static struct flow_dissector flow_keys_bonding __read_mostly; 256 257 /*-------------------------- Forward declarations ---------------------------*/ 258 259 static int bond_init(struct net_device *bond_dev); 260 static void bond_uninit(struct net_device *bond_dev); 261 static void bond_get_stats(struct net_device *bond_dev, 262 struct rtnl_link_stats64 *stats); 263 static void bond_slave_arr_handler(struct work_struct *work); 264 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 265 int mod); 266 static void bond_netdev_notify_work(struct work_struct *work); 267 268 /*---------------------------- General routines -----------------------------*/ 269 270 const char *bond_mode_name(int mode) 271 { 272 static const char *names[] = { 273 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)", 274 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)", 275 [BOND_MODE_XOR] = "load balancing (xor)", 276 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)", 277 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation", 278 [BOND_MODE_TLB] = "transmit load balancing", 279 [BOND_MODE_ALB] = "adaptive load balancing", 280 }; 281 282 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB) 283 return "unknown"; 284 285 return names[mode]; 286 } 287 288 /** 289 * bond_dev_queue_xmit - Prepare skb for xmit. 290 * 291 * @bond: bond device that got this skb for tx. 292 * @skb: hw accel VLAN tagged skb to transmit 293 * @slave_dev: slave that is supposed to xmit this skbuff 294 */ 295 netdev_tx_t bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, 296 struct net_device *slave_dev) 297 { 298 skb->dev = slave_dev; 299 300 BUILD_BUG_ON(sizeof(skb->queue_mapping) != 301 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping)); 302 skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping); 303 304 if (unlikely(netpoll_tx_running(bond->dev))) 305 return bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb); 306 307 return dev_queue_xmit(skb); 308 } 309 310 bool bond_sk_check(struct bonding *bond) 311 { 312 switch (BOND_MODE(bond)) { 313 case BOND_MODE_8023AD: 314 case BOND_MODE_XOR: 315 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34) 316 return true; 317 fallthrough; 318 default: 319 return false; 320 } 321 } 322 323 static bool bond_xdp_check(struct bonding *bond) 324 { 325 switch (BOND_MODE(bond)) { 326 case BOND_MODE_ROUNDROBIN: 327 case BOND_MODE_ACTIVEBACKUP: 328 return true; 329 case BOND_MODE_8023AD: 330 case BOND_MODE_XOR: 331 /* vlan+srcmac is not supported with XDP as in most cases the 802.1q 332 * payload is not in the packet due to hardware offload. 333 */ 334 if (bond->params.xmit_policy != BOND_XMIT_POLICY_VLAN_SRCMAC) 335 return true; 336 fallthrough; 337 default: 338 return false; 339 } 340 } 341 342 /*---------------------------------- VLAN -----------------------------------*/ 343 344 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid, 345 * We don't protect the slave list iteration with a lock because: 346 * a. This operation is performed in IOCTL context, 347 * b. The operation is protected by the RTNL semaphore in the 8021q code, 348 * c. Holding a lock with BH disabled while directly calling a base driver 349 * entry point is generally a BAD idea. 350 * 351 * The design of synchronization/protection for this operation in the 8021q 352 * module is good for one or more VLAN devices over a single physical device 353 * and cannot be extended for a teaming solution like bonding, so there is a 354 * potential race condition here where a net device from the vlan group might 355 * be referenced (either by a base driver or the 8021q code) while it is being 356 * removed from the system. However, it turns out we're not making matters 357 * worse, and if it works for regular VLAN usage it will work here too. 358 */ 359 360 /** 361 * bond_vlan_rx_add_vid - Propagates adding an id to slaves 362 * @bond_dev: bonding net device that got called 363 * @proto: network protocol ID 364 * @vid: vlan id being added 365 */ 366 static int bond_vlan_rx_add_vid(struct net_device *bond_dev, 367 __be16 proto, u16 vid) 368 { 369 struct bonding *bond = netdev_priv(bond_dev); 370 struct slave *slave, *rollback_slave; 371 struct list_head *iter; 372 int res; 373 374 bond_for_each_slave(bond, slave, iter) { 375 res = vlan_vid_add(slave->dev, proto, vid); 376 if (res) 377 goto unwind; 378 } 379 380 return 0; 381 382 unwind: 383 /* unwind to the slave that failed */ 384 bond_for_each_slave(bond, rollback_slave, iter) { 385 if (rollback_slave == slave) 386 break; 387 388 vlan_vid_del(rollback_slave->dev, proto, vid); 389 } 390 391 return res; 392 } 393 394 /** 395 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves 396 * @bond_dev: bonding net device that got called 397 * @proto: network protocol ID 398 * @vid: vlan id being removed 399 */ 400 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, 401 __be16 proto, u16 vid) 402 { 403 struct bonding *bond = netdev_priv(bond_dev); 404 struct list_head *iter; 405 struct slave *slave; 406 407 bond_for_each_slave(bond, slave, iter) 408 vlan_vid_del(slave->dev, proto, vid); 409 410 if (bond_is_lb(bond)) 411 bond_alb_clear_vlan(bond, vid); 412 413 return 0; 414 } 415 416 /*---------------------------------- XFRM -----------------------------------*/ 417 418 #ifdef CONFIG_XFRM_OFFLOAD 419 /** 420 * bond_ipsec_add_sa - program device with a security association 421 * @xs: pointer to transformer state struct 422 **/ 423 static int bond_ipsec_add_sa(struct xfrm_state *xs) 424 { 425 struct net_device *bond_dev = xs->xso.dev; 426 struct bond_ipsec *ipsec; 427 struct bonding *bond; 428 struct slave *slave; 429 int err; 430 431 if (!bond_dev) 432 return -EINVAL; 433 434 rcu_read_lock(); 435 bond = netdev_priv(bond_dev); 436 slave = rcu_dereference(bond->curr_active_slave); 437 if (!slave) { 438 rcu_read_unlock(); 439 return -ENODEV; 440 } 441 442 if (!slave->dev->xfrmdev_ops || 443 !slave->dev->xfrmdev_ops->xdo_dev_state_add || 444 netif_is_bond_master(slave->dev)) { 445 slave_warn(bond_dev, slave->dev, "Slave does not support ipsec offload\n"); 446 rcu_read_unlock(); 447 return -EINVAL; 448 } 449 450 ipsec = kmalloc(sizeof(*ipsec), GFP_ATOMIC); 451 if (!ipsec) { 452 rcu_read_unlock(); 453 return -ENOMEM; 454 } 455 xs->xso.real_dev = slave->dev; 456 457 err = slave->dev->xfrmdev_ops->xdo_dev_state_add(xs); 458 if (!err) { 459 ipsec->xs = xs; 460 INIT_LIST_HEAD(&ipsec->list); 461 spin_lock_bh(&bond->ipsec_lock); 462 list_add(&ipsec->list, &bond->ipsec_list); 463 spin_unlock_bh(&bond->ipsec_lock); 464 } else { 465 kfree(ipsec); 466 } 467 rcu_read_unlock(); 468 return err; 469 } 470 471 static void bond_ipsec_add_sa_all(struct bonding *bond) 472 { 473 struct net_device *bond_dev = bond->dev; 474 struct bond_ipsec *ipsec; 475 struct slave *slave; 476 477 rcu_read_lock(); 478 slave = rcu_dereference(bond->curr_active_slave); 479 if (!slave) 480 goto out; 481 482 if (!slave->dev->xfrmdev_ops || 483 !slave->dev->xfrmdev_ops->xdo_dev_state_add || 484 netif_is_bond_master(slave->dev)) { 485 spin_lock_bh(&bond->ipsec_lock); 486 if (!list_empty(&bond->ipsec_list)) 487 slave_warn(bond_dev, slave->dev, 488 "%s: no slave xdo_dev_state_add\n", 489 __func__); 490 spin_unlock_bh(&bond->ipsec_lock); 491 goto out; 492 } 493 494 spin_lock_bh(&bond->ipsec_lock); 495 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 496 ipsec->xs->xso.real_dev = slave->dev; 497 if (slave->dev->xfrmdev_ops->xdo_dev_state_add(ipsec->xs)) { 498 slave_warn(bond_dev, slave->dev, "%s: failed to add SA\n", __func__); 499 ipsec->xs->xso.real_dev = NULL; 500 } 501 } 502 spin_unlock_bh(&bond->ipsec_lock); 503 out: 504 rcu_read_unlock(); 505 } 506 507 /** 508 * bond_ipsec_del_sa - clear out this specific SA 509 * @xs: pointer to transformer state struct 510 **/ 511 static void bond_ipsec_del_sa(struct xfrm_state *xs) 512 { 513 struct net_device *bond_dev = xs->xso.dev; 514 struct bond_ipsec *ipsec; 515 struct bonding *bond; 516 struct slave *slave; 517 518 if (!bond_dev) 519 return; 520 521 rcu_read_lock(); 522 bond = netdev_priv(bond_dev); 523 slave = rcu_dereference(bond->curr_active_slave); 524 525 if (!slave) 526 goto out; 527 528 if (!xs->xso.real_dev) 529 goto out; 530 531 WARN_ON(xs->xso.real_dev != slave->dev); 532 533 if (!slave->dev->xfrmdev_ops || 534 !slave->dev->xfrmdev_ops->xdo_dev_state_delete || 535 netif_is_bond_master(slave->dev)) { 536 slave_warn(bond_dev, slave->dev, "%s: no slave xdo_dev_state_delete\n", __func__); 537 goto out; 538 } 539 540 slave->dev->xfrmdev_ops->xdo_dev_state_delete(xs); 541 out: 542 spin_lock_bh(&bond->ipsec_lock); 543 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 544 if (ipsec->xs == xs) { 545 list_del(&ipsec->list); 546 kfree(ipsec); 547 break; 548 } 549 } 550 spin_unlock_bh(&bond->ipsec_lock); 551 rcu_read_unlock(); 552 } 553 554 static void bond_ipsec_del_sa_all(struct bonding *bond) 555 { 556 struct net_device *bond_dev = bond->dev; 557 struct bond_ipsec *ipsec; 558 struct slave *slave; 559 560 rcu_read_lock(); 561 slave = rcu_dereference(bond->curr_active_slave); 562 if (!slave) { 563 rcu_read_unlock(); 564 return; 565 } 566 567 spin_lock_bh(&bond->ipsec_lock); 568 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 569 if (!ipsec->xs->xso.real_dev) 570 continue; 571 572 if (!slave->dev->xfrmdev_ops || 573 !slave->dev->xfrmdev_ops->xdo_dev_state_delete || 574 netif_is_bond_master(slave->dev)) { 575 slave_warn(bond_dev, slave->dev, 576 "%s: no slave xdo_dev_state_delete\n", 577 __func__); 578 } else { 579 slave->dev->xfrmdev_ops->xdo_dev_state_delete(ipsec->xs); 580 } 581 ipsec->xs->xso.real_dev = NULL; 582 } 583 spin_unlock_bh(&bond->ipsec_lock); 584 rcu_read_unlock(); 585 } 586 587 /** 588 * bond_ipsec_offload_ok - can this packet use the xfrm hw offload 589 * @skb: current data packet 590 * @xs: pointer to transformer state struct 591 **/ 592 static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs) 593 { 594 struct net_device *bond_dev = xs->xso.dev; 595 struct net_device *real_dev; 596 struct slave *curr_active; 597 struct bonding *bond; 598 int err; 599 600 bond = netdev_priv(bond_dev); 601 rcu_read_lock(); 602 curr_active = rcu_dereference(bond->curr_active_slave); 603 real_dev = curr_active->dev; 604 605 if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 606 err = false; 607 goto out; 608 } 609 610 if (!xs->xso.real_dev) { 611 err = false; 612 goto out; 613 } 614 615 if (!real_dev->xfrmdev_ops || 616 !real_dev->xfrmdev_ops->xdo_dev_offload_ok || 617 netif_is_bond_master(real_dev)) { 618 err = false; 619 goto out; 620 } 621 622 err = real_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs); 623 out: 624 rcu_read_unlock(); 625 return err; 626 } 627 628 static const struct xfrmdev_ops bond_xfrmdev_ops = { 629 .xdo_dev_state_add = bond_ipsec_add_sa, 630 .xdo_dev_state_delete = bond_ipsec_del_sa, 631 .xdo_dev_offload_ok = bond_ipsec_offload_ok, 632 }; 633 #endif /* CONFIG_XFRM_OFFLOAD */ 634 635 /*------------------------------- Link status -------------------------------*/ 636 637 /* Set the carrier state for the master according to the state of its 638 * slaves. If any slaves are up, the master is up. In 802.3ad mode, 639 * do special 802.3ad magic. 640 * 641 * Returns zero if carrier state does not change, nonzero if it does. 642 */ 643 int bond_set_carrier(struct bonding *bond) 644 { 645 struct list_head *iter; 646 struct slave *slave; 647 648 if (!bond_has_slaves(bond)) 649 goto down; 650 651 if (BOND_MODE(bond) == BOND_MODE_8023AD) 652 return bond_3ad_set_carrier(bond); 653 654 bond_for_each_slave(bond, slave, iter) { 655 if (slave->link == BOND_LINK_UP) { 656 if (!netif_carrier_ok(bond->dev)) { 657 netif_carrier_on(bond->dev); 658 return 1; 659 } 660 return 0; 661 } 662 } 663 664 down: 665 if (netif_carrier_ok(bond->dev)) { 666 netif_carrier_off(bond->dev); 667 return 1; 668 } 669 return 0; 670 } 671 672 /* Get link speed and duplex from the slave's base driver 673 * using ethtool. If for some reason the call fails or the 674 * values are invalid, set speed and duplex to -1, 675 * and return. Return 1 if speed or duplex settings are 676 * UNKNOWN; 0 otherwise. 677 */ 678 static int bond_update_speed_duplex(struct slave *slave) 679 { 680 struct net_device *slave_dev = slave->dev; 681 struct ethtool_link_ksettings ecmd; 682 int res; 683 684 slave->speed = SPEED_UNKNOWN; 685 slave->duplex = DUPLEX_UNKNOWN; 686 687 res = __ethtool_get_link_ksettings(slave_dev, &ecmd); 688 if (res < 0) 689 return 1; 690 if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1)) 691 return 1; 692 switch (ecmd.base.duplex) { 693 case DUPLEX_FULL: 694 case DUPLEX_HALF: 695 break; 696 default: 697 return 1; 698 } 699 700 slave->speed = ecmd.base.speed; 701 slave->duplex = ecmd.base.duplex; 702 703 return 0; 704 } 705 706 const char *bond_slave_link_status(s8 link) 707 { 708 switch (link) { 709 case BOND_LINK_UP: 710 return "up"; 711 case BOND_LINK_FAIL: 712 return "going down"; 713 case BOND_LINK_DOWN: 714 return "down"; 715 case BOND_LINK_BACK: 716 return "going back"; 717 default: 718 return "unknown"; 719 } 720 } 721 722 /* if <dev> supports MII link status reporting, check its link status. 723 * 724 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), 725 * depending upon the setting of the use_carrier parameter. 726 * 727 * Return either BMSR_LSTATUS, meaning that the link is up (or we 728 * can't tell and just pretend it is), or 0, meaning that the link is 729 * down. 730 * 731 * If reporting is non-zero, instead of faking link up, return -1 if 732 * both ETHTOOL and MII ioctls fail (meaning the device does not 733 * support them). If use_carrier is set, return whatever it says. 734 * It'd be nice if there was a good way to tell if a driver supports 735 * netif_carrier, but there really isn't. 736 */ 737 static int bond_check_dev_link(struct bonding *bond, 738 struct net_device *slave_dev, int reporting) 739 { 740 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 741 int (*ioctl)(struct net_device *, struct ifreq *, int); 742 struct ifreq ifr; 743 struct mii_ioctl_data *mii; 744 745 if (!reporting && !netif_running(slave_dev)) 746 return 0; 747 748 if (bond->params.use_carrier) 749 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; 750 751 /* Try to get link status using Ethtool first. */ 752 if (slave_dev->ethtool_ops->get_link) 753 return slave_dev->ethtool_ops->get_link(slave_dev) ? 754 BMSR_LSTATUS : 0; 755 756 /* Ethtool can't be used, fallback to MII ioctls. */ 757 ioctl = slave_ops->ndo_eth_ioctl; 758 if (ioctl) { 759 /* TODO: set pointer to correct ioctl on a per team member 760 * bases to make this more efficient. that is, once 761 * we determine the correct ioctl, we will always 762 * call it and not the others for that team 763 * member. 764 */ 765 766 /* We cannot assume that SIOCGMIIPHY will also read a 767 * register; not all network drivers (e.g., e100) 768 * support that. 769 */ 770 771 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ 772 strscpy_pad(ifr.ifr_name, slave_dev->name, IFNAMSIZ); 773 mii = if_mii(&ifr); 774 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) { 775 mii->reg_num = MII_BMSR; 776 if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0) 777 return mii->val_out & BMSR_LSTATUS; 778 } 779 } 780 781 /* If reporting, report that either there's no ndo_eth_ioctl, 782 * or both SIOCGMIIREG and get_link failed (meaning that we 783 * cannot report link status). If not reporting, pretend 784 * we're ok. 785 */ 786 return reporting ? -1 : BMSR_LSTATUS; 787 } 788 789 /*----------------------------- Multicast list ------------------------------*/ 790 791 /* Push the promiscuity flag down to appropriate slaves */ 792 static int bond_set_promiscuity(struct bonding *bond, int inc) 793 { 794 struct list_head *iter; 795 int err = 0; 796 797 if (bond_uses_primary(bond)) { 798 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 799 800 if (curr_active) 801 err = dev_set_promiscuity(curr_active->dev, inc); 802 } else { 803 struct slave *slave; 804 805 bond_for_each_slave(bond, slave, iter) { 806 err = dev_set_promiscuity(slave->dev, inc); 807 if (err) 808 return err; 809 } 810 } 811 return err; 812 } 813 814 /* Push the allmulti flag down to all slaves */ 815 static int bond_set_allmulti(struct bonding *bond, int inc) 816 { 817 struct list_head *iter; 818 int err = 0; 819 820 if (bond_uses_primary(bond)) { 821 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 822 823 if (curr_active) 824 err = dev_set_allmulti(curr_active->dev, inc); 825 } else { 826 struct slave *slave; 827 828 bond_for_each_slave(bond, slave, iter) { 829 err = dev_set_allmulti(slave->dev, inc); 830 if (err) 831 return err; 832 } 833 } 834 return err; 835 } 836 837 /* Retrieve the list of registered multicast addresses for the bonding 838 * device and retransmit an IGMP JOIN request to the current active 839 * slave. 840 */ 841 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work) 842 { 843 struct bonding *bond = container_of(work, struct bonding, 844 mcast_work.work); 845 846 if (!rtnl_trylock()) { 847 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 848 return; 849 } 850 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev); 851 852 if (bond->igmp_retrans > 1) { 853 bond->igmp_retrans--; 854 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); 855 } 856 rtnl_unlock(); 857 } 858 859 /* Flush bond's hardware addresses from slave */ 860 static void bond_hw_addr_flush(struct net_device *bond_dev, 861 struct net_device *slave_dev) 862 { 863 struct bonding *bond = netdev_priv(bond_dev); 864 865 dev_uc_unsync(slave_dev, bond_dev); 866 dev_mc_unsync(slave_dev, bond_dev); 867 868 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 869 /* del lacpdu mc addr from mc list */ 870 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 871 872 dev_mc_del(slave_dev, lacpdu_multicast); 873 } 874 } 875 876 /*--------------------------- Active slave change ---------------------------*/ 877 878 /* Update the hardware address list and promisc/allmulti for the new and 879 * old active slaves (if any). Modes that are not using primary keep all 880 * slaves up date at all times; only the modes that use primary need to call 881 * this function to swap these settings during a failover. 882 */ 883 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active, 884 struct slave *old_active) 885 { 886 if (old_active) { 887 if (bond->dev->flags & IFF_PROMISC) 888 dev_set_promiscuity(old_active->dev, -1); 889 890 if (bond->dev->flags & IFF_ALLMULTI) 891 dev_set_allmulti(old_active->dev, -1); 892 893 bond_hw_addr_flush(bond->dev, old_active->dev); 894 } 895 896 if (new_active) { 897 /* FIXME: Signal errors upstream. */ 898 if (bond->dev->flags & IFF_PROMISC) 899 dev_set_promiscuity(new_active->dev, 1); 900 901 if (bond->dev->flags & IFF_ALLMULTI) 902 dev_set_allmulti(new_active->dev, 1); 903 904 netif_addr_lock_bh(bond->dev); 905 dev_uc_sync(new_active->dev, bond->dev); 906 dev_mc_sync(new_active->dev, bond->dev); 907 netif_addr_unlock_bh(bond->dev); 908 } 909 } 910 911 /** 912 * bond_set_dev_addr - clone slave's address to bond 913 * @bond_dev: bond net device 914 * @slave_dev: slave net device 915 * 916 * Should be called with RTNL held. 917 */ 918 static int bond_set_dev_addr(struct net_device *bond_dev, 919 struct net_device *slave_dev) 920 { 921 int err; 922 923 slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n", 924 bond_dev, slave_dev, slave_dev->addr_len); 925 err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL); 926 if (err) 927 return err; 928 929 __dev_addr_set(bond_dev, slave_dev->dev_addr, slave_dev->addr_len); 930 bond_dev->addr_assign_type = NET_ADDR_STOLEN; 931 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev); 932 return 0; 933 } 934 935 static struct slave *bond_get_old_active(struct bonding *bond, 936 struct slave *new_active) 937 { 938 struct slave *slave; 939 struct list_head *iter; 940 941 bond_for_each_slave(bond, slave, iter) { 942 if (slave == new_active) 943 continue; 944 945 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr)) 946 return slave; 947 } 948 949 return NULL; 950 } 951 952 /* bond_do_fail_over_mac 953 * 954 * Perform special MAC address swapping for fail_over_mac settings 955 * 956 * Called with RTNL 957 */ 958 static void bond_do_fail_over_mac(struct bonding *bond, 959 struct slave *new_active, 960 struct slave *old_active) 961 { 962 u8 tmp_mac[MAX_ADDR_LEN]; 963 struct sockaddr_storage ss; 964 int rv; 965 966 switch (bond->params.fail_over_mac) { 967 case BOND_FOM_ACTIVE: 968 if (new_active) { 969 rv = bond_set_dev_addr(bond->dev, new_active->dev); 970 if (rv) 971 slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n", 972 -rv); 973 } 974 break; 975 case BOND_FOM_FOLLOW: 976 /* if new_active && old_active, swap them 977 * if just old_active, do nothing (going to no active slave) 978 * if just new_active, set new_active to bond's MAC 979 */ 980 if (!new_active) 981 return; 982 983 if (!old_active) 984 old_active = bond_get_old_active(bond, new_active); 985 986 if (old_active) { 987 bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr, 988 new_active->dev->addr_len); 989 bond_hw_addr_copy(ss.__data, 990 old_active->dev->dev_addr, 991 old_active->dev->addr_len); 992 ss.ss_family = new_active->dev->type; 993 } else { 994 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr, 995 bond->dev->addr_len); 996 ss.ss_family = bond->dev->type; 997 } 998 999 rv = dev_set_mac_address(new_active->dev, 1000 (struct sockaddr *)&ss, NULL); 1001 if (rv) { 1002 slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n", 1003 -rv); 1004 goto out; 1005 } 1006 1007 if (!old_active) 1008 goto out; 1009 1010 bond_hw_addr_copy(ss.__data, tmp_mac, 1011 new_active->dev->addr_len); 1012 ss.ss_family = old_active->dev->type; 1013 1014 rv = dev_set_mac_address(old_active->dev, 1015 (struct sockaddr *)&ss, NULL); 1016 if (rv) 1017 slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n", 1018 -rv); 1019 out: 1020 break; 1021 default: 1022 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n", 1023 bond->params.fail_over_mac); 1024 break; 1025 } 1026 1027 } 1028 1029 /** 1030 * bond_choose_primary_or_current - select the primary or high priority slave 1031 * @bond: our bonding struct 1032 * 1033 * - Check if there is a primary link. If the primary link was set and is up, 1034 * go on and do link reselection. 1035 * 1036 * - If primary link is not set or down, find the highest priority link. 1037 * If the highest priority link is not current slave, set it as primary 1038 * link and do link reselection. 1039 */ 1040 static struct slave *bond_choose_primary_or_current(struct bonding *bond) 1041 { 1042 struct slave *prim = rtnl_dereference(bond->primary_slave); 1043 struct slave *curr = rtnl_dereference(bond->curr_active_slave); 1044 struct slave *slave, *hprio = NULL; 1045 struct list_head *iter; 1046 1047 if (!prim || prim->link != BOND_LINK_UP) { 1048 bond_for_each_slave(bond, slave, iter) { 1049 if (slave->link == BOND_LINK_UP) { 1050 hprio = hprio ?: slave; 1051 if (slave->prio > hprio->prio) 1052 hprio = slave; 1053 } 1054 } 1055 1056 if (hprio && hprio != curr) { 1057 prim = hprio; 1058 goto link_reselect; 1059 } 1060 1061 if (!curr || curr->link != BOND_LINK_UP) 1062 return NULL; 1063 return curr; 1064 } 1065 1066 if (bond->force_primary) { 1067 bond->force_primary = false; 1068 return prim; 1069 } 1070 1071 link_reselect: 1072 if (!curr || curr->link != BOND_LINK_UP) 1073 return prim; 1074 1075 /* At this point, prim and curr are both up */ 1076 switch (bond->params.primary_reselect) { 1077 case BOND_PRI_RESELECT_ALWAYS: 1078 return prim; 1079 case BOND_PRI_RESELECT_BETTER: 1080 if (prim->speed < curr->speed) 1081 return curr; 1082 if (prim->speed == curr->speed && prim->duplex <= curr->duplex) 1083 return curr; 1084 return prim; 1085 case BOND_PRI_RESELECT_FAILURE: 1086 return curr; 1087 default: 1088 netdev_err(bond->dev, "impossible primary_reselect %d\n", 1089 bond->params.primary_reselect); 1090 return curr; 1091 } 1092 } 1093 1094 /** 1095 * bond_find_best_slave - select the best available slave to be the active one 1096 * @bond: our bonding struct 1097 */ 1098 static struct slave *bond_find_best_slave(struct bonding *bond) 1099 { 1100 struct slave *slave, *bestslave = NULL; 1101 struct list_head *iter; 1102 int mintime = bond->params.updelay; 1103 1104 slave = bond_choose_primary_or_current(bond); 1105 if (slave) 1106 return slave; 1107 1108 bond_for_each_slave(bond, slave, iter) { 1109 if (slave->link == BOND_LINK_UP) 1110 return slave; 1111 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) && 1112 slave->delay < mintime) { 1113 mintime = slave->delay; 1114 bestslave = slave; 1115 } 1116 } 1117 1118 return bestslave; 1119 } 1120 1121 static bool bond_should_notify_peers(struct bonding *bond) 1122 { 1123 struct slave *slave; 1124 1125 rcu_read_lock(); 1126 slave = rcu_dereference(bond->curr_active_slave); 1127 rcu_read_unlock(); 1128 1129 if (!slave || !bond->send_peer_notif || 1130 bond->send_peer_notif % 1131 max(1, bond->params.peer_notif_delay) != 0 || 1132 !netif_carrier_ok(bond->dev) || 1133 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) 1134 return false; 1135 1136 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n", 1137 slave ? slave->dev->name : "NULL"); 1138 1139 return true; 1140 } 1141 1142 /** 1143 * bond_change_active_slave - change the active slave into the specified one 1144 * @bond: our bonding struct 1145 * @new_active: the new slave to make the active one 1146 * 1147 * Set the new slave to the bond's settings and unset them on the old 1148 * curr_active_slave. 1149 * Setting include flags, mc-list, promiscuity, allmulti, etc. 1150 * 1151 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, 1152 * because it is apparently the best available slave we have, even though its 1153 * updelay hasn't timed out yet. 1154 * 1155 * Caller must hold RTNL. 1156 */ 1157 void bond_change_active_slave(struct bonding *bond, struct slave *new_active) 1158 { 1159 struct slave *old_active; 1160 1161 ASSERT_RTNL(); 1162 1163 old_active = rtnl_dereference(bond->curr_active_slave); 1164 1165 if (old_active == new_active) 1166 return; 1167 1168 #ifdef CONFIG_XFRM_OFFLOAD 1169 bond_ipsec_del_sa_all(bond); 1170 #endif /* CONFIG_XFRM_OFFLOAD */ 1171 1172 if (new_active) { 1173 new_active->last_link_up = jiffies; 1174 1175 if (new_active->link == BOND_LINK_BACK) { 1176 if (bond_uses_primary(bond)) { 1177 slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n", 1178 (bond->params.updelay - new_active->delay) * bond->params.miimon); 1179 } 1180 1181 new_active->delay = 0; 1182 bond_set_slave_link_state(new_active, BOND_LINK_UP, 1183 BOND_SLAVE_NOTIFY_NOW); 1184 1185 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1186 bond_3ad_handle_link_change(new_active, BOND_LINK_UP); 1187 1188 if (bond_is_lb(bond)) 1189 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); 1190 } else { 1191 if (bond_uses_primary(bond)) 1192 slave_info(bond->dev, new_active->dev, "making interface the new active one\n"); 1193 } 1194 } 1195 1196 if (bond_uses_primary(bond)) 1197 bond_hw_addr_swap(bond, new_active, old_active); 1198 1199 if (bond_is_lb(bond)) { 1200 bond_alb_handle_active_change(bond, new_active); 1201 if (old_active) 1202 bond_set_slave_inactive_flags(old_active, 1203 BOND_SLAVE_NOTIFY_NOW); 1204 if (new_active) 1205 bond_set_slave_active_flags(new_active, 1206 BOND_SLAVE_NOTIFY_NOW); 1207 } else { 1208 rcu_assign_pointer(bond->curr_active_slave, new_active); 1209 } 1210 1211 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) { 1212 if (old_active) 1213 bond_set_slave_inactive_flags(old_active, 1214 BOND_SLAVE_NOTIFY_NOW); 1215 1216 if (new_active) { 1217 bool should_notify_peers = false; 1218 1219 bond_set_slave_active_flags(new_active, 1220 BOND_SLAVE_NOTIFY_NOW); 1221 1222 if (bond->params.fail_over_mac) 1223 bond_do_fail_over_mac(bond, new_active, 1224 old_active); 1225 1226 if (netif_running(bond->dev)) { 1227 bond->send_peer_notif = 1228 bond->params.num_peer_notif * 1229 max(1, bond->params.peer_notif_delay); 1230 should_notify_peers = 1231 bond_should_notify_peers(bond); 1232 } 1233 1234 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev); 1235 if (should_notify_peers) { 1236 bond->send_peer_notif--; 1237 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 1238 bond->dev); 1239 } 1240 } 1241 } 1242 1243 #ifdef CONFIG_XFRM_OFFLOAD 1244 bond_ipsec_add_sa_all(bond); 1245 #endif /* CONFIG_XFRM_OFFLOAD */ 1246 1247 /* resend IGMP joins since active slave has changed or 1248 * all were sent on curr_active_slave. 1249 * resend only if bond is brought up with the affected 1250 * bonding modes and the retransmission is enabled 1251 */ 1252 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && 1253 ((bond_uses_primary(bond) && new_active) || 1254 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) { 1255 bond->igmp_retrans = bond->params.resend_igmp; 1256 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 1257 } 1258 } 1259 1260 /** 1261 * bond_select_active_slave - select a new active slave, if needed 1262 * @bond: our bonding struct 1263 * 1264 * This functions should be called when one of the following occurs: 1265 * - The old curr_active_slave has been released or lost its link. 1266 * - The primary_slave has got its link back. 1267 * - A slave has got its link back and there's no old curr_active_slave. 1268 * 1269 * Caller must hold RTNL. 1270 */ 1271 void bond_select_active_slave(struct bonding *bond) 1272 { 1273 struct slave *best_slave; 1274 int rv; 1275 1276 ASSERT_RTNL(); 1277 1278 best_slave = bond_find_best_slave(bond); 1279 if (best_slave != rtnl_dereference(bond->curr_active_slave)) { 1280 bond_change_active_slave(bond, best_slave); 1281 rv = bond_set_carrier(bond); 1282 if (!rv) 1283 return; 1284 1285 if (netif_carrier_ok(bond->dev)) 1286 netdev_info(bond->dev, "active interface up!\n"); 1287 else 1288 netdev_info(bond->dev, "now running without any active interface!\n"); 1289 } 1290 } 1291 1292 #ifdef CONFIG_NET_POLL_CONTROLLER 1293 static inline int slave_enable_netpoll(struct slave *slave) 1294 { 1295 struct netpoll *np; 1296 int err = 0; 1297 1298 np = kzalloc(sizeof(*np), GFP_KERNEL); 1299 err = -ENOMEM; 1300 if (!np) 1301 goto out; 1302 1303 err = __netpoll_setup(np, slave->dev); 1304 if (err) { 1305 kfree(np); 1306 goto out; 1307 } 1308 slave->np = np; 1309 out: 1310 return err; 1311 } 1312 static inline void slave_disable_netpoll(struct slave *slave) 1313 { 1314 struct netpoll *np = slave->np; 1315 1316 if (!np) 1317 return; 1318 1319 slave->np = NULL; 1320 1321 __netpoll_free(np); 1322 } 1323 1324 static void bond_poll_controller(struct net_device *bond_dev) 1325 { 1326 struct bonding *bond = netdev_priv(bond_dev); 1327 struct slave *slave = NULL; 1328 struct list_head *iter; 1329 struct ad_info ad_info; 1330 1331 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1332 if (bond_3ad_get_active_agg_info(bond, &ad_info)) 1333 return; 1334 1335 bond_for_each_slave_rcu(bond, slave, iter) { 1336 if (!bond_slave_is_up(slave)) 1337 continue; 1338 1339 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1340 struct aggregator *agg = 1341 SLAVE_AD_INFO(slave)->port.aggregator; 1342 1343 if (agg && 1344 agg->aggregator_identifier != ad_info.aggregator_id) 1345 continue; 1346 } 1347 1348 netpoll_poll_dev(slave->dev); 1349 } 1350 } 1351 1352 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1353 { 1354 struct bonding *bond = netdev_priv(bond_dev); 1355 struct list_head *iter; 1356 struct slave *slave; 1357 1358 bond_for_each_slave(bond, slave, iter) 1359 if (bond_slave_is_up(slave)) 1360 slave_disable_netpoll(slave); 1361 } 1362 1363 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) 1364 { 1365 struct bonding *bond = netdev_priv(dev); 1366 struct list_head *iter; 1367 struct slave *slave; 1368 int err = 0; 1369 1370 bond_for_each_slave(bond, slave, iter) { 1371 err = slave_enable_netpoll(slave); 1372 if (err) { 1373 bond_netpoll_cleanup(dev); 1374 break; 1375 } 1376 } 1377 return err; 1378 } 1379 #else 1380 static inline int slave_enable_netpoll(struct slave *slave) 1381 { 1382 return 0; 1383 } 1384 static inline void slave_disable_netpoll(struct slave *slave) 1385 { 1386 } 1387 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1388 { 1389 } 1390 #endif 1391 1392 /*---------------------------------- IOCTL ----------------------------------*/ 1393 1394 static netdev_features_t bond_fix_features(struct net_device *dev, 1395 netdev_features_t features) 1396 { 1397 struct bonding *bond = netdev_priv(dev); 1398 struct list_head *iter; 1399 netdev_features_t mask; 1400 struct slave *slave; 1401 1402 #if IS_ENABLED(CONFIG_TLS_DEVICE) 1403 if (bond_sk_check(bond)) 1404 features |= BOND_TLS_FEATURES; 1405 else 1406 features &= ~BOND_TLS_FEATURES; 1407 #endif 1408 1409 mask = features; 1410 1411 features &= ~NETIF_F_ONE_FOR_ALL; 1412 features |= NETIF_F_ALL_FOR_ALL; 1413 1414 bond_for_each_slave(bond, slave, iter) { 1415 features = netdev_increment_features(features, 1416 slave->dev->features, 1417 mask); 1418 } 1419 features = netdev_add_tso_features(features, mask); 1420 1421 return features; 1422 } 1423 1424 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1425 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | \ 1426 NETIF_F_HIGHDMA | NETIF_F_LRO) 1427 1428 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1429 NETIF_F_RXCSUM | NETIF_F_GSO_SOFTWARE) 1430 1431 #define BOND_MPLS_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1432 NETIF_F_GSO_SOFTWARE) 1433 1434 1435 static void bond_compute_features(struct bonding *bond) 1436 { 1437 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE | 1438 IFF_XMIT_DST_RELEASE_PERM; 1439 netdev_features_t vlan_features = BOND_VLAN_FEATURES; 1440 netdev_features_t enc_features = BOND_ENC_FEATURES; 1441 #ifdef CONFIG_XFRM_OFFLOAD 1442 netdev_features_t xfrm_features = BOND_XFRM_FEATURES; 1443 #endif /* CONFIG_XFRM_OFFLOAD */ 1444 netdev_features_t mpls_features = BOND_MPLS_FEATURES; 1445 struct net_device *bond_dev = bond->dev; 1446 struct list_head *iter; 1447 struct slave *slave; 1448 unsigned short max_hard_header_len = ETH_HLEN; 1449 unsigned int tso_max_size = TSO_MAX_SIZE; 1450 u16 tso_max_segs = TSO_MAX_SEGS; 1451 1452 if (!bond_has_slaves(bond)) 1453 goto done; 1454 vlan_features &= NETIF_F_ALL_FOR_ALL; 1455 mpls_features &= NETIF_F_ALL_FOR_ALL; 1456 1457 bond_for_each_slave(bond, slave, iter) { 1458 vlan_features = netdev_increment_features(vlan_features, 1459 slave->dev->vlan_features, BOND_VLAN_FEATURES); 1460 1461 enc_features = netdev_increment_features(enc_features, 1462 slave->dev->hw_enc_features, 1463 BOND_ENC_FEATURES); 1464 1465 #ifdef CONFIG_XFRM_OFFLOAD 1466 xfrm_features = netdev_increment_features(xfrm_features, 1467 slave->dev->hw_enc_features, 1468 BOND_XFRM_FEATURES); 1469 #endif /* CONFIG_XFRM_OFFLOAD */ 1470 1471 mpls_features = netdev_increment_features(mpls_features, 1472 slave->dev->mpls_features, 1473 BOND_MPLS_FEATURES); 1474 1475 dst_release_flag &= slave->dev->priv_flags; 1476 if (slave->dev->hard_header_len > max_hard_header_len) 1477 max_hard_header_len = slave->dev->hard_header_len; 1478 1479 tso_max_size = min(tso_max_size, slave->dev->tso_max_size); 1480 tso_max_segs = min(tso_max_segs, slave->dev->tso_max_segs); 1481 } 1482 bond_dev->hard_header_len = max_hard_header_len; 1483 1484 done: 1485 bond_dev->vlan_features = vlan_features; 1486 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL | 1487 NETIF_F_HW_VLAN_CTAG_TX | 1488 NETIF_F_HW_VLAN_STAG_TX; 1489 #ifdef CONFIG_XFRM_OFFLOAD 1490 bond_dev->hw_enc_features |= xfrm_features; 1491 #endif /* CONFIG_XFRM_OFFLOAD */ 1492 bond_dev->mpls_features = mpls_features; 1493 netif_set_tso_max_segs(bond_dev, tso_max_segs); 1494 netif_set_tso_max_size(bond_dev, tso_max_size); 1495 1496 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1497 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) && 1498 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM)) 1499 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE; 1500 1501 netdev_change_features(bond_dev); 1502 } 1503 1504 static void bond_setup_by_slave(struct net_device *bond_dev, 1505 struct net_device *slave_dev) 1506 { 1507 bond_dev->header_ops = slave_dev->header_ops; 1508 1509 bond_dev->type = slave_dev->type; 1510 bond_dev->hard_header_len = slave_dev->hard_header_len; 1511 bond_dev->needed_headroom = slave_dev->needed_headroom; 1512 bond_dev->addr_len = slave_dev->addr_len; 1513 1514 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1515 slave_dev->addr_len); 1516 } 1517 1518 /* On bonding slaves other than the currently active slave, suppress 1519 * duplicates except for alb non-mcast/bcast. 1520 */ 1521 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1522 struct slave *slave, 1523 struct bonding *bond) 1524 { 1525 if (bond_is_slave_inactive(slave)) { 1526 if (BOND_MODE(bond) == BOND_MODE_ALB && 1527 skb->pkt_type != PACKET_BROADCAST && 1528 skb->pkt_type != PACKET_MULTICAST) 1529 return false; 1530 return true; 1531 } 1532 return false; 1533 } 1534 1535 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1536 { 1537 struct sk_buff *skb = *pskb; 1538 struct slave *slave; 1539 struct bonding *bond; 1540 int (*recv_probe)(const struct sk_buff *, struct bonding *, 1541 struct slave *); 1542 int ret = RX_HANDLER_ANOTHER; 1543 1544 skb = skb_share_check(skb, GFP_ATOMIC); 1545 if (unlikely(!skb)) 1546 return RX_HANDLER_CONSUMED; 1547 1548 *pskb = skb; 1549 1550 slave = bond_slave_get_rcu(skb->dev); 1551 bond = slave->bond; 1552 1553 recv_probe = READ_ONCE(bond->recv_probe); 1554 if (recv_probe) { 1555 ret = recv_probe(skb, bond, slave); 1556 if (ret == RX_HANDLER_CONSUMED) { 1557 consume_skb(skb); 1558 return ret; 1559 } 1560 } 1561 1562 /* 1563 * For packets determined by bond_should_deliver_exact_match() call to 1564 * be suppressed we want to make an exception for link-local packets. 1565 * This is necessary for e.g. LLDP daemons to be able to monitor 1566 * inactive slave links without being forced to bind to them 1567 * explicitly. 1568 * 1569 * At the same time, packets that are passed to the bonding master 1570 * (including link-local ones) can have their originating interface 1571 * determined via PACKET_ORIGDEV socket option. 1572 */ 1573 if (bond_should_deliver_exact_match(skb, slave, bond)) { 1574 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest)) 1575 return RX_HANDLER_PASS; 1576 return RX_HANDLER_EXACT; 1577 } 1578 1579 skb->dev = bond->dev; 1580 1581 if (BOND_MODE(bond) == BOND_MODE_ALB && 1582 netif_is_bridge_port(bond->dev) && 1583 skb->pkt_type == PACKET_HOST) { 1584 1585 if (unlikely(skb_cow_head(skb, 1586 skb->data - skb_mac_header(skb)))) { 1587 kfree_skb(skb); 1588 return RX_HANDLER_CONSUMED; 1589 } 1590 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, 1591 bond->dev->addr_len); 1592 } 1593 1594 return ret; 1595 } 1596 1597 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond) 1598 { 1599 switch (BOND_MODE(bond)) { 1600 case BOND_MODE_ROUNDROBIN: 1601 return NETDEV_LAG_TX_TYPE_ROUNDROBIN; 1602 case BOND_MODE_ACTIVEBACKUP: 1603 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP; 1604 case BOND_MODE_BROADCAST: 1605 return NETDEV_LAG_TX_TYPE_BROADCAST; 1606 case BOND_MODE_XOR: 1607 case BOND_MODE_8023AD: 1608 return NETDEV_LAG_TX_TYPE_HASH; 1609 default: 1610 return NETDEV_LAG_TX_TYPE_UNKNOWN; 1611 } 1612 } 1613 1614 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond, 1615 enum netdev_lag_tx_type type) 1616 { 1617 if (type != NETDEV_LAG_TX_TYPE_HASH) 1618 return NETDEV_LAG_HASH_NONE; 1619 1620 switch (bond->params.xmit_policy) { 1621 case BOND_XMIT_POLICY_LAYER2: 1622 return NETDEV_LAG_HASH_L2; 1623 case BOND_XMIT_POLICY_LAYER34: 1624 return NETDEV_LAG_HASH_L34; 1625 case BOND_XMIT_POLICY_LAYER23: 1626 return NETDEV_LAG_HASH_L23; 1627 case BOND_XMIT_POLICY_ENCAP23: 1628 return NETDEV_LAG_HASH_E23; 1629 case BOND_XMIT_POLICY_ENCAP34: 1630 return NETDEV_LAG_HASH_E34; 1631 case BOND_XMIT_POLICY_VLAN_SRCMAC: 1632 return NETDEV_LAG_HASH_VLAN_SRCMAC; 1633 default: 1634 return NETDEV_LAG_HASH_UNKNOWN; 1635 } 1636 } 1637 1638 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave, 1639 struct netlink_ext_ack *extack) 1640 { 1641 struct netdev_lag_upper_info lag_upper_info; 1642 enum netdev_lag_tx_type type; 1643 1644 type = bond_lag_tx_type(bond); 1645 lag_upper_info.tx_type = type; 1646 lag_upper_info.hash_type = bond_lag_hash_type(bond, type); 1647 1648 return netdev_master_upper_dev_link(slave->dev, bond->dev, slave, 1649 &lag_upper_info, extack); 1650 } 1651 1652 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave) 1653 { 1654 netdev_upper_dev_unlink(slave->dev, bond->dev); 1655 slave->dev->flags &= ~IFF_SLAVE; 1656 } 1657 1658 static void slave_kobj_release(struct kobject *kobj) 1659 { 1660 struct slave *slave = to_slave(kobj); 1661 struct bonding *bond = bond_get_bond_by_slave(slave); 1662 1663 cancel_delayed_work_sync(&slave->notify_work); 1664 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1665 kfree(SLAVE_AD_INFO(slave)); 1666 1667 kfree(slave); 1668 } 1669 1670 static struct kobj_type slave_ktype = { 1671 .release = slave_kobj_release, 1672 #ifdef CONFIG_SYSFS 1673 .sysfs_ops = &slave_sysfs_ops, 1674 #endif 1675 }; 1676 1677 static int bond_kobj_init(struct slave *slave) 1678 { 1679 int err; 1680 1681 err = kobject_init_and_add(&slave->kobj, &slave_ktype, 1682 &(slave->dev->dev.kobj), "bonding_slave"); 1683 if (err) 1684 kobject_put(&slave->kobj); 1685 1686 return err; 1687 } 1688 1689 static struct slave *bond_alloc_slave(struct bonding *bond, 1690 struct net_device *slave_dev) 1691 { 1692 struct slave *slave = NULL; 1693 1694 slave = kzalloc(sizeof(*slave), GFP_KERNEL); 1695 if (!slave) 1696 return NULL; 1697 1698 slave->bond = bond; 1699 slave->dev = slave_dev; 1700 INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work); 1701 1702 if (bond_kobj_init(slave)) 1703 return NULL; 1704 1705 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1706 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info), 1707 GFP_KERNEL); 1708 if (!SLAVE_AD_INFO(slave)) { 1709 kobject_put(&slave->kobj); 1710 return NULL; 1711 } 1712 } 1713 1714 return slave; 1715 } 1716 1717 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info) 1718 { 1719 info->bond_mode = BOND_MODE(bond); 1720 info->miimon = bond->params.miimon; 1721 info->num_slaves = bond->slave_cnt; 1722 } 1723 1724 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info) 1725 { 1726 strcpy(info->slave_name, slave->dev->name); 1727 info->link = slave->link; 1728 info->state = bond_slave_state(slave); 1729 info->link_failure_count = slave->link_failure_count; 1730 } 1731 1732 static void bond_netdev_notify_work(struct work_struct *_work) 1733 { 1734 struct slave *slave = container_of(_work, struct slave, 1735 notify_work.work); 1736 1737 if (rtnl_trylock()) { 1738 struct netdev_bonding_info binfo; 1739 1740 bond_fill_ifslave(slave, &binfo.slave); 1741 bond_fill_ifbond(slave->bond, &binfo.master); 1742 netdev_bonding_info_change(slave->dev, &binfo); 1743 rtnl_unlock(); 1744 } else { 1745 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1); 1746 } 1747 } 1748 1749 void bond_queue_slave_event(struct slave *slave) 1750 { 1751 queue_delayed_work(slave->bond->wq, &slave->notify_work, 0); 1752 } 1753 1754 void bond_lower_state_changed(struct slave *slave) 1755 { 1756 struct netdev_lag_lower_state_info info; 1757 1758 info.link_up = slave->link == BOND_LINK_UP || 1759 slave->link == BOND_LINK_FAIL; 1760 info.tx_enabled = bond_is_active_slave(slave); 1761 netdev_lower_state_changed(slave->dev, &info); 1762 } 1763 1764 #define BOND_NL_ERR(bond_dev, extack, errmsg) do { \ 1765 if (extack) \ 1766 NL_SET_ERR_MSG(extack, errmsg); \ 1767 else \ 1768 netdev_err(bond_dev, "Error: %s\n", errmsg); \ 1769 } while (0) 1770 1771 #define SLAVE_NL_ERR(bond_dev, slave_dev, extack, errmsg) do { \ 1772 if (extack) \ 1773 NL_SET_ERR_MSG(extack, errmsg); \ 1774 else \ 1775 slave_err(bond_dev, slave_dev, "Error: %s\n", errmsg); \ 1776 } while (0) 1777 1778 /* enslave device <slave> to bond device <master> */ 1779 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev, 1780 struct netlink_ext_ack *extack) 1781 { 1782 struct bonding *bond = netdev_priv(bond_dev); 1783 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1784 struct slave *new_slave = NULL, *prev_slave; 1785 struct sockaddr_storage ss; 1786 int link_reporting; 1787 int res = 0, i; 1788 1789 if (slave_dev->flags & IFF_MASTER && 1790 !netif_is_bond_master(slave_dev)) { 1791 BOND_NL_ERR(bond_dev, extack, 1792 "Device type (master device) cannot be enslaved"); 1793 return -EPERM; 1794 } 1795 1796 if (!bond->params.use_carrier && 1797 slave_dev->ethtool_ops->get_link == NULL && 1798 slave_ops->ndo_eth_ioctl == NULL) { 1799 slave_warn(bond_dev, slave_dev, "no link monitoring support\n"); 1800 } 1801 1802 /* already in-use? */ 1803 if (netdev_is_rx_handler_busy(slave_dev)) { 1804 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1805 "Device is in use and cannot be enslaved"); 1806 return -EBUSY; 1807 } 1808 1809 if (bond_dev == slave_dev) { 1810 BOND_NL_ERR(bond_dev, extack, "Cannot enslave bond to itself."); 1811 return -EPERM; 1812 } 1813 1814 /* vlan challenged mutual exclusion */ 1815 /* no need to lock since we're protected by rtnl_lock */ 1816 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1817 slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n"); 1818 if (vlan_uses_dev(bond_dev)) { 1819 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1820 "Can not enslave VLAN challenged device to VLAN enabled bond"); 1821 return -EPERM; 1822 } else { 1823 slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n"); 1824 } 1825 } else { 1826 slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n"); 1827 } 1828 1829 if (slave_dev->features & NETIF_F_HW_ESP) 1830 slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n"); 1831 1832 /* Old ifenslave binaries are no longer supported. These can 1833 * be identified with moderate accuracy by the state of the slave: 1834 * the current ifenslave will set the interface down prior to 1835 * enslaving it; the old ifenslave will not. 1836 */ 1837 if (slave_dev->flags & IFF_UP) { 1838 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1839 "Device can not be enslaved while up"); 1840 return -EPERM; 1841 } 1842 1843 /* set bonding device ether type by slave - bonding netdevices are 1844 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1845 * there is a need to override some of the type dependent attribs/funcs. 1846 * 1847 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1848 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1849 */ 1850 if (!bond_has_slaves(bond)) { 1851 if (bond_dev->type != slave_dev->type) { 1852 slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n", 1853 bond_dev->type, slave_dev->type); 1854 1855 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, 1856 bond_dev); 1857 res = notifier_to_errno(res); 1858 if (res) { 1859 slave_err(bond_dev, slave_dev, "refused to change device type\n"); 1860 return -EBUSY; 1861 } 1862 1863 /* Flush unicast and multicast addresses */ 1864 dev_uc_flush(bond_dev); 1865 dev_mc_flush(bond_dev); 1866 1867 if (slave_dev->type != ARPHRD_ETHER) 1868 bond_setup_by_slave(bond_dev, slave_dev); 1869 else { 1870 ether_setup(bond_dev); 1871 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1872 } 1873 1874 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, 1875 bond_dev); 1876 } 1877 } else if (bond_dev->type != slave_dev->type) { 1878 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1879 "Device type is different from other slaves"); 1880 return -EINVAL; 1881 } 1882 1883 if (slave_dev->type == ARPHRD_INFINIBAND && 1884 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1885 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1886 "Only active-backup mode is supported for infiniband slaves"); 1887 res = -EOPNOTSUPP; 1888 goto err_undo_flags; 1889 } 1890 1891 if (!slave_ops->ndo_set_mac_address || 1892 slave_dev->type == ARPHRD_INFINIBAND) { 1893 slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n"); 1894 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP && 1895 bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1896 if (!bond_has_slaves(bond)) { 1897 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1898 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n"); 1899 } else { 1900 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1901 "Slave device does not support setting the MAC address, but fail_over_mac is not set to active"); 1902 res = -EOPNOTSUPP; 1903 goto err_undo_flags; 1904 } 1905 } 1906 } 1907 1908 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1909 1910 /* If this is the first slave, then we need to set the master's hardware 1911 * address to be the same as the slave's. 1912 */ 1913 if (!bond_has_slaves(bond) && 1914 bond->dev->addr_assign_type == NET_ADDR_RANDOM) { 1915 res = bond_set_dev_addr(bond->dev, slave_dev); 1916 if (res) 1917 goto err_undo_flags; 1918 } 1919 1920 new_slave = bond_alloc_slave(bond, slave_dev); 1921 if (!new_slave) { 1922 res = -ENOMEM; 1923 goto err_undo_flags; 1924 } 1925 1926 /* Set the new_slave's queue_id to be zero. Queue ID mapping 1927 * is set via sysfs or module option if desired. 1928 */ 1929 new_slave->queue_id = 0; 1930 1931 /* Save slave's original mtu and then set it to match the bond */ 1932 new_slave->original_mtu = slave_dev->mtu; 1933 res = dev_set_mtu(slave_dev, bond->dev->mtu); 1934 if (res) { 1935 slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res); 1936 goto err_free; 1937 } 1938 1939 /* Save slave's original ("permanent") mac address for modes 1940 * that need it, and for restoring it upon release, and then 1941 * set it to the master's address 1942 */ 1943 bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr, 1944 slave_dev->addr_len); 1945 1946 if (!bond->params.fail_over_mac || 1947 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1948 /* Set slave to master's mac address. The application already 1949 * set the master's mac address to that of the first slave 1950 */ 1951 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 1952 ss.ss_family = slave_dev->type; 1953 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, 1954 extack); 1955 if (res) { 1956 slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res); 1957 goto err_restore_mtu; 1958 } 1959 } 1960 1961 /* set slave flag before open to prevent IPv6 addrconf */ 1962 slave_dev->flags |= IFF_SLAVE; 1963 1964 /* open the slave since the application closed it */ 1965 res = dev_open(slave_dev, extack); 1966 if (res) { 1967 slave_err(bond_dev, slave_dev, "Opening slave failed\n"); 1968 goto err_restore_mac; 1969 } 1970 1971 slave_dev->priv_flags |= IFF_BONDING; 1972 /* initialize slave stats */ 1973 dev_get_stats(new_slave->dev, &new_slave->slave_stats); 1974 1975 if (bond_is_lb(bond)) { 1976 /* bond_alb_init_slave() must be called before all other stages since 1977 * it might fail and we do not want to have to undo everything 1978 */ 1979 res = bond_alb_init_slave(bond, new_slave); 1980 if (res) 1981 goto err_close; 1982 } 1983 1984 res = vlan_vids_add_by_dev(slave_dev, bond_dev); 1985 if (res) { 1986 slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n"); 1987 goto err_close; 1988 } 1989 1990 prev_slave = bond_last_slave(bond); 1991 1992 new_slave->delay = 0; 1993 new_slave->link_failure_count = 0; 1994 1995 if (bond_update_speed_duplex(new_slave) && 1996 bond_needs_speed_duplex(bond)) 1997 new_slave->link = BOND_LINK_DOWN; 1998 1999 new_slave->last_rx = jiffies - 2000 (msecs_to_jiffies(bond->params.arp_interval) + 1); 2001 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) 2002 new_slave->target_last_arp_rx[i] = new_slave->last_rx; 2003 2004 new_slave->last_tx = new_slave->last_rx; 2005 2006 if (bond->params.miimon && !bond->params.use_carrier) { 2007 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 2008 2009 if ((link_reporting == -1) && !bond->params.arp_interval) { 2010 /* miimon is set but a bonded network driver 2011 * does not support ETHTOOL/MII and 2012 * arp_interval is not set. Note: if 2013 * use_carrier is enabled, we will never go 2014 * here (because netif_carrier is always 2015 * supported); thus, we don't need to change 2016 * the messages for netif_carrier. 2017 */ 2018 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"); 2019 } else if (link_reporting == -1) { 2020 /* unable get link status using mii/ethtool */ 2021 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"); 2022 } 2023 } 2024 2025 /* check for initial state */ 2026 new_slave->link = BOND_LINK_NOCHANGE; 2027 if (bond->params.miimon) { 2028 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { 2029 if (bond->params.updelay) { 2030 bond_set_slave_link_state(new_slave, 2031 BOND_LINK_BACK, 2032 BOND_SLAVE_NOTIFY_NOW); 2033 new_slave->delay = bond->params.updelay; 2034 } else { 2035 bond_set_slave_link_state(new_slave, 2036 BOND_LINK_UP, 2037 BOND_SLAVE_NOTIFY_NOW); 2038 } 2039 } else { 2040 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN, 2041 BOND_SLAVE_NOTIFY_NOW); 2042 } 2043 } else if (bond->params.arp_interval) { 2044 bond_set_slave_link_state(new_slave, 2045 (netif_carrier_ok(slave_dev) ? 2046 BOND_LINK_UP : BOND_LINK_DOWN), 2047 BOND_SLAVE_NOTIFY_NOW); 2048 } else { 2049 bond_set_slave_link_state(new_slave, BOND_LINK_UP, 2050 BOND_SLAVE_NOTIFY_NOW); 2051 } 2052 2053 if (new_slave->link != BOND_LINK_DOWN) 2054 new_slave->last_link_up = jiffies; 2055 slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n", 2056 new_slave->link == BOND_LINK_DOWN ? "DOWN" : 2057 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); 2058 2059 if (bond_uses_primary(bond) && bond->params.primary[0]) { 2060 /* if there is a primary slave, remember it */ 2061 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 2062 rcu_assign_pointer(bond->primary_slave, new_slave); 2063 bond->force_primary = true; 2064 } 2065 } 2066 2067 switch (BOND_MODE(bond)) { 2068 case BOND_MODE_ACTIVEBACKUP: 2069 bond_set_slave_inactive_flags(new_slave, 2070 BOND_SLAVE_NOTIFY_NOW); 2071 break; 2072 case BOND_MODE_8023AD: 2073 /* in 802.3ad mode, the internal mechanism 2074 * will activate the slaves in the selected 2075 * aggregator 2076 */ 2077 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 2078 /* if this is the first slave */ 2079 if (!prev_slave) { 2080 SLAVE_AD_INFO(new_slave)->id = 1; 2081 /* Initialize AD with the number of times that the AD timer is called in 1 second 2082 * can be called only after the mac address of the bond is set 2083 */ 2084 bond_3ad_initialize(bond); 2085 } else { 2086 SLAVE_AD_INFO(new_slave)->id = 2087 SLAVE_AD_INFO(prev_slave)->id + 1; 2088 } 2089 2090 bond_3ad_bind_slave(new_slave); 2091 break; 2092 case BOND_MODE_TLB: 2093 case BOND_MODE_ALB: 2094 bond_set_active_slave(new_slave); 2095 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 2096 break; 2097 default: 2098 slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n"); 2099 2100 /* always active in trunk mode */ 2101 bond_set_active_slave(new_slave); 2102 2103 /* In trunking mode there is little meaning to curr_active_slave 2104 * anyway (it holds no special properties of the bond device), 2105 * so we can change it without calling change_active_interface() 2106 */ 2107 if (!rcu_access_pointer(bond->curr_active_slave) && 2108 new_slave->link == BOND_LINK_UP) 2109 rcu_assign_pointer(bond->curr_active_slave, new_slave); 2110 2111 break; 2112 } /* switch(bond_mode) */ 2113 2114 #ifdef CONFIG_NET_POLL_CONTROLLER 2115 if (bond->dev->npinfo) { 2116 if (slave_enable_netpoll(new_slave)) { 2117 slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n"); 2118 res = -EBUSY; 2119 goto err_detach; 2120 } 2121 } 2122 #endif 2123 2124 if (!(bond_dev->features & NETIF_F_LRO)) 2125 dev_disable_lro(slave_dev); 2126 2127 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 2128 new_slave); 2129 if (res) { 2130 slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res); 2131 goto err_detach; 2132 } 2133 2134 res = bond_master_upper_dev_link(bond, new_slave, extack); 2135 if (res) { 2136 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res); 2137 goto err_unregister; 2138 } 2139 2140 bond_lower_state_changed(new_slave); 2141 2142 res = bond_sysfs_slave_add(new_slave); 2143 if (res) { 2144 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res); 2145 goto err_upper_unlink; 2146 } 2147 2148 /* If the mode uses primary, then the following is handled by 2149 * bond_change_active_slave(). 2150 */ 2151 if (!bond_uses_primary(bond)) { 2152 /* set promiscuity level to new slave */ 2153 if (bond_dev->flags & IFF_PROMISC) { 2154 res = dev_set_promiscuity(slave_dev, 1); 2155 if (res) 2156 goto err_sysfs_del; 2157 } 2158 2159 /* set allmulti level to new slave */ 2160 if (bond_dev->flags & IFF_ALLMULTI) { 2161 res = dev_set_allmulti(slave_dev, 1); 2162 if (res) { 2163 if (bond_dev->flags & IFF_PROMISC) 2164 dev_set_promiscuity(slave_dev, -1); 2165 goto err_sysfs_del; 2166 } 2167 } 2168 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 /* add lacpdu mc addr to mc list */ 2176 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 2177 2178 dev_mc_add(slave_dev, lacpdu_multicast); 2179 } 2180 } 2181 2182 bond->slave_cnt++; 2183 bond_compute_features(bond); 2184 bond_set_carrier(bond); 2185 2186 if (bond_uses_primary(bond)) { 2187 block_netpoll_tx(); 2188 bond_select_active_slave(bond); 2189 unblock_netpoll_tx(); 2190 } 2191 2192 if (bond_mode_can_use_xmit_hash(bond)) 2193 bond_update_slave_arr(bond, NULL); 2194 2195 2196 if (!slave_dev->netdev_ops->ndo_bpf || 2197 !slave_dev->netdev_ops->ndo_xdp_xmit) { 2198 if (bond->xdp_prog) { 2199 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 2200 "Slave does not support XDP"); 2201 res = -EOPNOTSUPP; 2202 goto err_sysfs_del; 2203 } 2204 } else if (bond->xdp_prog) { 2205 struct netdev_bpf xdp = { 2206 .command = XDP_SETUP_PROG, 2207 .flags = 0, 2208 .prog = bond->xdp_prog, 2209 .extack = extack, 2210 }; 2211 2212 if (dev_xdp_prog_count(slave_dev) > 0) { 2213 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 2214 "Slave has XDP program loaded, please unload before enslaving"); 2215 res = -EOPNOTSUPP; 2216 goto err_sysfs_del; 2217 } 2218 2219 res = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 2220 if (res < 0) { 2221 /* ndo_bpf() sets extack error message */ 2222 slave_dbg(bond_dev, slave_dev, "Error %d calling ndo_bpf\n", res); 2223 goto err_sysfs_del; 2224 } 2225 if (bond->xdp_prog) 2226 bpf_prog_inc(bond->xdp_prog); 2227 } 2228 2229 slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n", 2230 bond_is_active_slave(new_slave) ? "an active" : "a backup", 2231 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down"); 2232 2233 /* enslave is successful */ 2234 bond_queue_slave_event(new_slave); 2235 return 0; 2236 2237 /* Undo stages on error */ 2238 err_sysfs_del: 2239 bond_sysfs_slave_del(new_slave); 2240 2241 err_upper_unlink: 2242 bond_upper_dev_unlink(bond, new_slave); 2243 2244 err_unregister: 2245 netdev_rx_handler_unregister(slave_dev); 2246 2247 err_detach: 2248 vlan_vids_del_by_dev(slave_dev, bond_dev); 2249 if (rcu_access_pointer(bond->primary_slave) == new_slave) 2250 RCU_INIT_POINTER(bond->primary_slave, NULL); 2251 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) { 2252 block_netpoll_tx(); 2253 bond_change_active_slave(bond, NULL); 2254 bond_select_active_slave(bond); 2255 unblock_netpoll_tx(); 2256 } 2257 /* either primary_slave or curr_active_slave might've changed */ 2258 synchronize_rcu(); 2259 slave_disable_netpoll(new_slave); 2260 2261 err_close: 2262 if (!netif_is_bond_master(slave_dev)) 2263 slave_dev->priv_flags &= ~IFF_BONDING; 2264 dev_close(slave_dev); 2265 2266 err_restore_mac: 2267 slave_dev->flags &= ~IFF_SLAVE; 2268 if (!bond->params.fail_over_mac || 2269 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2270 /* XXX TODO - fom follow mode needs to change master's 2271 * MAC if this slave's MAC is in use by the bond, or at 2272 * least print a warning. 2273 */ 2274 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr, 2275 new_slave->dev->addr_len); 2276 ss.ss_family = slave_dev->type; 2277 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL); 2278 } 2279 2280 err_restore_mtu: 2281 dev_set_mtu(slave_dev, new_slave->original_mtu); 2282 2283 err_free: 2284 kobject_put(&new_slave->kobj); 2285 2286 err_undo_flags: 2287 /* Enslave of first slave has failed and we need to fix master's mac */ 2288 if (!bond_has_slaves(bond)) { 2289 if (ether_addr_equal_64bits(bond_dev->dev_addr, 2290 slave_dev->dev_addr)) 2291 eth_hw_addr_random(bond_dev); 2292 if (bond_dev->type != ARPHRD_ETHER) { 2293 dev_close(bond_dev); 2294 ether_setup(bond_dev); 2295 bond_dev->flags |= IFF_MASTER; 2296 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 2297 } 2298 } 2299 2300 return res; 2301 } 2302 2303 /* Try to release the slave device <slave> from the bond device <master> 2304 * It is legal to access curr_active_slave without a lock because all the function 2305 * is RTNL-locked. If "all" is true it means that the function is being called 2306 * while destroying a bond interface and all slaves are being released. 2307 * 2308 * The rules for slave state should be: 2309 * for Active/Backup: 2310 * Active stays on all backups go down 2311 * for Bonded connections: 2312 * The first up interface should be left on and all others downed. 2313 */ 2314 static int __bond_release_one(struct net_device *bond_dev, 2315 struct net_device *slave_dev, 2316 bool all, bool unregister) 2317 { 2318 struct bonding *bond = netdev_priv(bond_dev); 2319 struct slave *slave, *oldcurrent; 2320 struct sockaddr_storage ss; 2321 int old_flags = bond_dev->flags; 2322 netdev_features_t old_features = bond_dev->features; 2323 2324 /* slave is not a slave or master is not master of this slave */ 2325 if (!(slave_dev->flags & IFF_SLAVE) || 2326 !netdev_has_upper_dev(slave_dev, bond_dev)) { 2327 slave_dbg(bond_dev, slave_dev, "cannot release slave\n"); 2328 return -EINVAL; 2329 } 2330 2331 block_netpoll_tx(); 2332 2333 slave = bond_get_slave_by_dev(bond, slave_dev); 2334 if (!slave) { 2335 /* not a slave of this bond */ 2336 slave_info(bond_dev, slave_dev, "interface not enslaved\n"); 2337 unblock_netpoll_tx(); 2338 return -EINVAL; 2339 } 2340 2341 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW); 2342 2343 bond_sysfs_slave_del(slave); 2344 2345 /* recompute stats just before removing the slave */ 2346 bond_get_stats(bond->dev, &bond->bond_stats); 2347 2348 if (bond->xdp_prog) { 2349 struct netdev_bpf xdp = { 2350 .command = XDP_SETUP_PROG, 2351 .flags = 0, 2352 .prog = NULL, 2353 .extack = NULL, 2354 }; 2355 if (slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp)) 2356 slave_warn(bond_dev, slave_dev, "failed to unload XDP program\n"); 2357 } 2358 2359 /* unregister rx_handler early so bond_handle_frame wouldn't be called 2360 * for this slave anymore. 2361 */ 2362 netdev_rx_handler_unregister(slave_dev); 2363 2364 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2365 bond_3ad_unbind_slave(slave); 2366 2367 bond_upper_dev_unlink(bond, slave); 2368 2369 if (bond_mode_can_use_xmit_hash(bond)) 2370 bond_update_slave_arr(bond, slave); 2371 2372 slave_info(bond_dev, slave_dev, "Releasing %s interface\n", 2373 bond_is_active_slave(slave) ? "active" : "backup"); 2374 2375 oldcurrent = rcu_access_pointer(bond->curr_active_slave); 2376 2377 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2378 2379 if (!all && (!bond->params.fail_over_mac || 2380 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) { 2381 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) && 2382 bond_has_slaves(bond)) 2383 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", 2384 slave->perm_hwaddr); 2385 } 2386 2387 if (rtnl_dereference(bond->primary_slave) == slave) 2388 RCU_INIT_POINTER(bond->primary_slave, NULL); 2389 2390 if (oldcurrent == slave) 2391 bond_change_active_slave(bond, NULL); 2392 2393 if (bond_is_lb(bond)) { 2394 /* Must be called only after the slave has been 2395 * detached from the list and the curr_active_slave 2396 * has been cleared (if our_slave == old_current), 2397 * but before a new active slave is selected. 2398 */ 2399 bond_alb_deinit_slave(bond, slave); 2400 } 2401 2402 if (all) { 2403 RCU_INIT_POINTER(bond->curr_active_slave, NULL); 2404 } else if (oldcurrent == slave) { 2405 /* Note that we hold RTNL over this sequence, so there 2406 * is no concern that another slave add/remove event 2407 * will interfere. 2408 */ 2409 bond_select_active_slave(bond); 2410 } 2411 2412 bond_set_carrier(bond); 2413 if (!bond_has_slaves(bond)) 2414 eth_hw_addr_random(bond_dev); 2415 2416 unblock_netpoll_tx(); 2417 synchronize_rcu(); 2418 bond->slave_cnt--; 2419 2420 if (!bond_has_slaves(bond)) { 2421 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 2422 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev); 2423 } 2424 2425 bond_compute_features(bond); 2426 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 2427 (old_features & NETIF_F_VLAN_CHALLENGED)) 2428 slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n"); 2429 2430 vlan_vids_del_by_dev(slave_dev, bond_dev); 2431 2432 /* If the mode uses primary, then this case was handled above by 2433 * bond_change_active_slave(..., NULL) 2434 */ 2435 if (!bond_uses_primary(bond)) { 2436 /* unset promiscuity level from slave 2437 * NOTE: The NETDEV_CHANGEADDR call above may change the value 2438 * of the IFF_PROMISC flag in the bond_dev, but we need the 2439 * value of that flag before that change, as that was the value 2440 * when this slave was attached, so we cache at the start of the 2441 * function and use it here. Same goes for ALLMULTI below 2442 */ 2443 if (old_flags & IFF_PROMISC) 2444 dev_set_promiscuity(slave_dev, -1); 2445 2446 /* unset allmulti level from slave */ 2447 if (old_flags & IFF_ALLMULTI) 2448 dev_set_allmulti(slave_dev, -1); 2449 2450 bond_hw_addr_flush(bond_dev, slave_dev); 2451 } 2452 2453 slave_disable_netpoll(slave); 2454 2455 /* close slave before restoring its mac address */ 2456 dev_close(slave_dev); 2457 2458 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE || 2459 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2460 /* restore original ("permanent") mac address */ 2461 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr, 2462 slave->dev->addr_len); 2463 ss.ss_family = slave_dev->type; 2464 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL); 2465 } 2466 2467 if (unregister) 2468 __dev_set_mtu(slave_dev, slave->original_mtu); 2469 else 2470 dev_set_mtu(slave_dev, slave->original_mtu); 2471 2472 if (!netif_is_bond_master(slave_dev)) 2473 slave_dev->priv_flags &= ~IFF_BONDING; 2474 2475 kobject_put(&slave->kobj); 2476 2477 return 0; 2478 } 2479 2480 /* A wrapper used because of ndo_del_link */ 2481 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 2482 { 2483 return __bond_release_one(bond_dev, slave_dev, false, false); 2484 } 2485 2486 /* First release a slave and then destroy the bond if no more slaves are left. 2487 * Must be under rtnl_lock when this function is called. 2488 */ 2489 static int bond_release_and_destroy(struct net_device *bond_dev, 2490 struct net_device *slave_dev) 2491 { 2492 struct bonding *bond = netdev_priv(bond_dev); 2493 int ret; 2494 2495 ret = __bond_release_one(bond_dev, slave_dev, false, true); 2496 if (ret == 0 && !bond_has_slaves(bond) && 2497 bond_dev->reg_state != NETREG_UNREGISTERING) { 2498 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 2499 netdev_info(bond_dev, "Destroying bond\n"); 2500 bond_remove_proc_entry(bond); 2501 unregister_netdevice(bond_dev); 2502 } 2503 return ret; 2504 } 2505 2506 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info) 2507 { 2508 struct bonding *bond = netdev_priv(bond_dev); 2509 2510 bond_fill_ifbond(bond, info); 2511 } 2512 2513 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 2514 { 2515 struct bonding *bond = netdev_priv(bond_dev); 2516 struct list_head *iter; 2517 int i = 0, res = -ENODEV; 2518 struct slave *slave; 2519 2520 bond_for_each_slave(bond, slave, iter) { 2521 if (i++ == (int)info->slave_id) { 2522 res = 0; 2523 bond_fill_ifslave(slave, info); 2524 break; 2525 } 2526 } 2527 2528 return res; 2529 } 2530 2531 /*-------------------------------- Monitoring -------------------------------*/ 2532 2533 /* called with rcu_read_lock() */ 2534 static int bond_miimon_inspect(struct bonding *bond) 2535 { 2536 int link_state, commit = 0; 2537 struct list_head *iter; 2538 struct slave *slave; 2539 bool ignore_updelay; 2540 2541 ignore_updelay = !rcu_dereference(bond->curr_active_slave); 2542 2543 bond_for_each_slave_rcu(bond, slave, iter) { 2544 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 2545 2546 link_state = bond_check_dev_link(bond, slave->dev, 0); 2547 2548 switch (slave->link) { 2549 case BOND_LINK_UP: 2550 if (link_state) 2551 continue; 2552 2553 bond_propose_link_state(slave, BOND_LINK_FAIL); 2554 commit++; 2555 slave->delay = bond->params.downdelay; 2556 if (slave->delay) { 2557 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n", 2558 (BOND_MODE(bond) == 2559 BOND_MODE_ACTIVEBACKUP) ? 2560 (bond_is_active_slave(slave) ? 2561 "active " : "backup ") : "", 2562 bond->params.downdelay * bond->params.miimon); 2563 } 2564 fallthrough; 2565 case BOND_LINK_FAIL: 2566 if (link_state) { 2567 /* recovered before downdelay expired */ 2568 bond_propose_link_state(slave, BOND_LINK_UP); 2569 slave->last_link_up = jiffies; 2570 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n", 2571 (bond->params.downdelay - slave->delay) * 2572 bond->params.miimon); 2573 commit++; 2574 continue; 2575 } 2576 2577 if (slave->delay <= 0) { 2578 bond_propose_link_state(slave, BOND_LINK_DOWN); 2579 commit++; 2580 continue; 2581 } 2582 2583 slave->delay--; 2584 break; 2585 2586 case BOND_LINK_DOWN: 2587 if (!link_state) 2588 continue; 2589 2590 bond_propose_link_state(slave, BOND_LINK_BACK); 2591 commit++; 2592 slave->delay = bond->params.updelay; 2593 2594 if (slave->delay) { 2595 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n", 2596 ignore_updelay ? 0 : 2597 bond->params.updelay * 2598 bond->params.miimon); 2599 } 2600 fallthrough; 2601 case BOND_LINK_BACK: 2602 if (!link_state) { 2603 bond_propose_link_state(slave, BOND_LINK_DOWN); 2604 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n", 2605 (bond->params.updelay - slave->delay) * 2606 bond->params.miimon); 2607 commit++; 2608 continue; 2609 } 2610 2611 if (ignore_updelay) 2612 slave->delay = 0; 2613 2614 if (slave->delay <= 0) { 2615 bond_propose_link_state(slave, BOND_LINK_UP); 2616 commit++; 2617 ignore_updelay = false; 2618 continue; 2619 } 2620 2621 slave->delay--; 2622 break; 2623 } 2624 } 2625 2626 return commit; 2627 } 2628 2629 static void bond_miimon_link_change(struct bonding *bond, 2630 struct slave *slave, 2631 char link) 2632 { 2633 switch (BOND_MODE(bond)) { 2634 case BOND_MODE_8023AD: 2635 bond_3ad_handle_link_change(slave, link); 2636 break; 2637 case BOND_MODE_TLB: 2638 case BOND_MODE_ALB: 2639 bond_alb_handle_link_change(bond, slave, link); 2640 break; 2641 case BOND_MODE_XOR: 2642 bond_update_slave_arr(bond, NULL); 2643 break; 2644 } 2645 } 2646 2647 static void bond_miimon_commit(struct bonding *bond) 2648 { 2649 struct list_head *iter; 2650 struct slave *slave, *primary; 2651 2652 bond_for_each_slave(bond, slave, iter) { 2653 switch (slave->link_new_state) { 2654 case BOND_LINK_NOCHANGE: 2655 /* For 802.3ad mode, check current slave speed and 2656 * duplex again in case its port was disabled after 2657 * invalid speed/duplex reporting but recovered before 2658 * link monitoring could make a decision on the actual 2659 * link status 2660 */ 2661 if (BOND_MODE(bond) == BOND_MODE_8023AD && 2662 slave->link == BOND_LINK_UP) 2663 bond_3ad_adapter_speed_duplex_changed(slave); 2664 continue; 2665 2666 case BOND_LINK_UP: 2667 if (bond_update_speed_duplex(slave) && 2668 bond_needs_speed_duplex(bond)) { 2669 slave->link = BOND_LINK_DOWN; 2670 if (net_ratelimit()) 2671 slave_warn(bond->dev, slave->dev, 2672 "failed to get link speed/duplex\n"); 2673 continue; 2674 } 2675 bond_set_slave_link_state(slave, BOND_LINK_UP, 2676 BOND_SLAVE_NOTIFY_NOW); 2677 slave->last_link_up = jiffies; 2678 2679 primary = rtnl_dereference(bond->primary_slave); 2680 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 2681 /* prevent it from being the active one */ 2682 bond_set_backup_slave(slave); 2683 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2684 /* make it immediately active */ 2685 bond_set_active_slave(slave); 2686 } 2687 2688 slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n", 2689 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed, 2690 slave->duplex ? "full" : "half"); 2691 2692 bond_miimon_link_change(bond, slave, BOND_LINK_UP); 2693 2694 if (!bond->curr_active_slave || slave == primary) 2695 goto do_failover; 2696 2697 continue; 2698 2699 case BOND_LINK_DOWN: 2700 if (slave->link_failure_count < UINT_MAX) 2701 slave->link_failure_count++; 2702 2703 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2704 BOND_SLAVE_NOTIFY_NOW); 2705 2706 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP || 2707 BOND_MODE(bond) == BOND_MODE_8023AD) 2708 bond_set_slave_inactive_flags(slave, 2709 BOND_SLAVE_NOTIFY_NOW); 2710 2711 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n"); 2712 2713 bond_miimon_link_change(bond, slave, BOND_LINK_DOWN); 2714 2715 if (slave == rcu_access_pointer(bond->curr_active_slave)) 2716 goto do_failover; 2717 2718 continue; 2719 2720 default: 2721 slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n", 2722 slave->link_new_state); 2723 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 2724 2725 continue; 2726 } 2727 2728 do_failover: 2729 block_netpoll_tx(); 2730 bond_select_active_slave(bond); 2731 unblock_netpoll_tx(); 2732 } 2733 2734 bond_set_carrier(bond); 2735 } 2736 2737 /* bond_mii_monitor 2738 * 2739 * Really a wrapper that splits the mii monitor into two phases: an 2740 * inspection, then (if inspection indicates something needs to be done) 2741 * an acquisition of appropriate locks followed by a commit phase to 2742 * implement whatever link state changes are indicated. 2743 */ 2744 static void bond_mii_monitor(struct work_struct *work) 2745 { 2746 struct bonding *bond = container_of(work, struct bonding, 2747 mii_work.work); 2748 bool should_notify_peers = false; 2749 bool commit; 2750 unsigned long delay; 2751 struct slave *slave; 2752 struct list_head *iter; 2753 2754 delay = msecs_to_jiffies(bond->params.miimon); 2755 2756 if (!bond_has_slaves(bond)) 2757 goto re_arm; 2758 2759 rcu_read_lock(); 2760 should_notify_peers = bond_should_notify_peers(bond); 2761 commit = !!bond_miimon_inspect(bond); 2762 if (bond->send_peer_notif) { 2763 rcu_read_unlock(); 2764 if (rtnl_trylock()) { 2765 bond->send_peer_notif--; 2766 rtnl_unlock(); 2767 } 2768 } else { 2769 rcu_read_unlock(); 2770 } 2771 2772 if (commit) { 2773 /* Race avoidance with bond_close cancel of workqueue */ 2774 if (!rtnl_trylock()) { 2775 delay = 1; 2776 should_notify_peers = false; 2777 goto re_arm; 2778 } 2779 2780 bond_for_each_slave(bond, slave, iter) { 2781 bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER); 2782 } 2783 bond_miimon_commit(bond); 2784 2785 rtnl_unlock(); /* might sleep, hold no other locks */ 2786 } 2787 2788 re_arm: 2789 if (bond->params.miimon) 2790 queue_delayed_work(bond->wq, &bond->mii_work, delay); 2791 2792 if (should_notify_peers) { 2793 if (!rtnl_trylock()) 2794 return; 2795 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); 2796 rtnl_unlock(); 2797 } 2798 } 2799 2800 static int bond_upper_dev_walk(struct net_device *upper, 2801 struct netdev_nested_priv *priv) 2802 { 2803 __be32 ip = *(__be32 *)priv->data; 2804 2805 return ip == bond_confirm_addr(upper, 0, ip); 2806 } 2807 2808 static bool bond_has_this_ip(struct bonding *bond, __be32 ip) 2809 { 2810 struct netdev_nested_priv priv = { 2811 .data = (void *)&ip, 2812 }; 2813 bool ret = false; 2814 2815 if (ip == bond_confirm_addr(bond->dev, 0, ip)) 2816 return true; 2817 2818 rcu_read_lock(); 2819 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &priv)) 2820 ret = true; 2821 rcu_read_unlock(); 2822 2823 return ret; 2824 } 2825 2826 static bool bond_handle_vlan(struct slave *slave, struct bond_vlan_tag *tags, 2827 struct sk_buff *skb) 2828 { 2829 struct net_device *bond_dev = slave->bond->dev; 2830 struct net_device *slave_dev = slave->dev; 2831 struct bond_vlan_tag *outer_tag = tags; 2832 2833 if (!tags || tags->vlan_proto == VLAN_N_VID) 2834 return true; 2835 2836 tags++; 2837 2838 /* Go through all the tags backwards and add them to the packet */ 2839 while (tags->vlan_proto != VLAN_N_VID) { 2840 if (!tags->vlan_id) { 2841 tags++; 2842 continue; 2843 } 2844 2845 slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n", 2846 ntohs(outer_tag->vlan_proto), tags->vlan_id); 2847 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto, 2848 tags->vlan_id); 2849 if (!skb) { 2850 net_err_ratelimited("failed to insert inner VLAN tag\n"); 2851 return false; 2852 } 2853 2854 tags++; 2855 } 2856 /* Set the outer tag */ 2857 if (outer_tag->vlan_id) { 2858 slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n", 2859 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id); 2860 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto, 2861 outer_tag->vlan_id); 2862 } 2863 2864 return true; 2865 } 2866 2867 /* We go to the (large) trouble of VLAN tagging ARP frames because 2868 * switches in VLAN mode (especially if ports are configured as 2869 * "native" to a VLAN) might not pass non-tagged frames. 2870 */ 2871 static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip, 2872 __be32 src_ip, struct bond_vlan_tag *tags) 2873 { 2874 struct net_device *bond_dev = slave->bond->dev; 2875 struct net_device *slave_dev = slave->dev; 2876 struct sk_buff *skb; 2877 2878 slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n", 2879 arp_op, &dest_ip, &src_ip); 2880 2881 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2882 NULL, slave_dev->dev_addr, NULL); 2883 2884 if (!skb) { 2885 net_err_ratelimited("ARP packet allocation failed\n"); 2886 return; 2887 } 2888 2889 if (bond_handle_vlan(slave, tags, skb)) { 2890 slave_update_last_tx(slave); 2891 arp_xmit(skb); 2892 } 2893 2894 return; 2895 } 2896 2897 /* Validate the device path between the @start_dev and the @end_dev. 2898 * The path is valid if the @end_dev is reachable through device 2899 * stacking. 2900 * When the path is validated, collect any vlan information in the 2901 * path. 2902 */ 2903 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev, 2904 struct net_device *end_dev, 2905 int level) 2906 { 2907 struct bond_vlan_tag *tags; 2908 struct net_device *upper; 2909 struct list_head *iter; 2910 2911 if (start_dev == end_dev) { 2912 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC); 2913 if (!tags) 2914 return ERR_PTR(-ENOMEM); 2915 tags[level].vlan_proto = VLAN_N_VID; 2916 return tags; 2917 } 2918 2919 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) { 2920 tags = bond_verify_device_path(upper, end_dev, level + 1); 2921 if (IS_ERR_OR_NULL(tags)) { 2922 if (IS_ERR(tags)) 2923 return tags; 2924 continue; 2925 } 2926 if (is_vlan_dev(upper)) { 2927 tags[level].vlan_proto = vlan_dev_vlan_proto(upper); 2928 tags[level].vlan_id = vlan_dev_vlan_id(upper); 2929 } 2930 2931 return tags; 2932 } 2933 2934 return NULL; 2935 } 2936 2937 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2938 { 2939 struct rtable *rt; 2940 struct bond_vlan_tag *tags; 2941 __be32 *targets = bond->params.arp_targets, addr; 2942 int i; 2943 2944 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) { 2945 slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n", 2946 __func__, &targets[i]); 2947 tags = NULL; 2948 2949 /* Find out through which dev should the packet go */ 2950 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 2951 RTO_ONLINK, 0); 2952 if (IS_ERR(rt)) { 2953 /* there's no route to target - try to send arp 2954 * probe to generate any traffic (arp_validate=0) 2955 */ 2956 if (bond->params.arp_validate) 2957 pr_warn_once("%s: no route to arp_ip_target %pI4 and arp_validate is set\n", 2958 bond->dev->name, 2959 &targets[i]); 2960 bond_arp_send(slave, ARPOP_REQUEST, targets[i], 2961 0, tags); 2962 continue; 2963 } 2964 2965 /* bond device itself */ 2966 if (rt->dst.dev == bond->dev) 2967 goto found; 2968 2969 rcu_read_lock(); 2970 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0); 2971 rcu_read_unlock(); 2972 2973 if (!IS_ERR_OR_NULL(tags)) 2974 goto found; 2975 2976 /* Not our device - skip */ 2977 slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n", 2978 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL"); 2979 2980 ip_rt_put(rt); 2981 continue; 2982 2983 found: 2984 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0); 2985 ip_rt_put(rt); 2986 bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags); 2987 kfree(tags); 2988 } 2989 } 2990 2991 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 2992 { 2993 int i; 2994 2995 if (!sip || !bond_has_this_ip(bond, tip)) { 2996 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n", 2997 __func__, &sip, &tip); 2998 return; 2999 } 3000 3001 i = bond_get_targets_ip(bond->params.arp_targets, sip); 3002 if (i == -1) { 3003 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n", 3004 __func__, &sip); 3005 return; 3006 } 3007 slave->last_rx = jiffies; 3008 slave->target_last_arp_rx[i] = jiffies; 3009 } 3010 3011 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, 3012 struct slave *slave) 3013 { 3014 struct arphdr *arp = (struct arphdr *)skb->data; 3015 struct slave *curr_active_slave, *curr_arp_slave; 3016 unsigned char *arp_ptr; 3017 __be32 sip, tip; 3018 unsigned int alen; 3019 3020 alen = arp_hdr_len(bond->dev); 3021 3022 if (alen > skb_headlen(skb)) { 3023 arp = kmalloc(alen, GFP_ATOMIC); 3024 if (!arp) 3025 goto out_unlock; 3026 if (skb_copy_bits(skb, 0, arp, alen) < 0) 3027 goto out_unlock; 3028 } 3029 3030 if (arp->ar_hln != bond->dev->addr_len || 3031 skb->pkt_type == PACKET_OTHERHOST || 3032 skb->pkt_type == PACKET_LOOPBACK || 3033 arp->ar_hrd != htons(ARPHRD_ETHER) || 3034 arp->ar_pro != htons(ETH_P_IP) || 3035 arp->ar_pln != 4) 3036 goto out_unlock; 3037 3038 arp_ptr = (unsigned char *)(arp + 1); 3039 arp_ptr += bond->dev->addr_len; 3040 memcpy(&sip, arp_ptr, 4); 3041 arp_ptr += 4 + bond->dev->addr_len; 3042 memcpy(&tip, arp_ptr, 4); 3043 3044 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n", 3045 __func__, slave->dev->name, bond_slave_state(slave), 3046 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 3047 &sip, &tip); 3048 3049 curr_active_slave = rcu_dereference(bond->curr_active_slave); 3050 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 3051 3052 /* We 'trust' the received ARP enough to validate it if: 3053 * 3054 * (a) the slave receiving the ARP is active (which includes the 3055 * current ARP slave, if any), or 3056 * 3057 * (b) the receiving slave isn't active, but there is a currently 3058 * active slave and it received valid arp reply(s) after it became 3059 * the currently active slave, or 3060 * 3061 * (c) there is an ARP slave that sent an ARP during the prior ARP 3062 * interval, and we receive an ARP reply on any slave. We accept 3063 * these because switch FDB update delays may deliver the ARP 3064 * reply to a slave other than the sender of the ARP request. 3065 * 3066 * Note: for (b), backup slaves are receiving the broadcast ARP 3067 * request, not a reply. This request passes from the sending 3068 * slave through the L2 switch(es) to the receiving slave. Since 3069 * this is checking the request, sip/tip are swapped for 3070 * validation. 3071 * 3072 * This is done to avoid endless looping when we can't reach the 3073 * arp_ip_target and fool ourselves with our own arp requests. 3074 */ 3075 if (bond_is_active_slave(slave)) 3076 bond_validate_arp(bond, slave, sip, tip); 3077 else if (curr_active_slave && 3078 time_after(slave_last_rx(bond, curr_active_slave), 3079 curr_active_slave->last_link_up)) 3080 bond_validate_arp(bond, slave, tip, sip); 3081 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) && 3082 bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1)) 3083 bond_validate_arp(bond, slave, sip, tip); 3084 3085 out_unlock: 3086 if (arp != (struct arphdr *)skb->data) 3087 kfree(arp); 3088 return RX_HANDLER_ANOTHER; 3089 } 3090 3091 #if IS_ENABLED(CONFIG_IPV6) 3092 static void bond_ns_send(struct slave *slave, const struct in6_addr *daddr, 3093 const struct in6_addr *saddr, struct bond_vlan_tag *tags) 3094 { 3095 struct net_device *bond_dev = slave->bond->dev; 3096 struct net_device *slave_dev = slave->dev; 3097 struct in6_addr mcaddr; 3098 struct sk_buff *skb; 3099 3100 slave_dbg(bond_dev, slave_dev, "NS on slave: dst %pI6c src %pI6c\n", 3101 daddr, saddr); 3102 3103 skb = ndisc_ns_create(slave_dev, daddr, saddr, 0); 3104 if (!skb) { 3105 net_err_ratelimited("NS packet allocation failed\n"); 3106 return; 3107 } 3108 3109 addrconf_addr_solict_mult(daddr, &mcaddr); 3110 if (bond_handle_vlan(slave, tags, skb)) { 3111 slave_update_last_tx(slave); 3112 ndisc_send_skb(skb, &mcaddr, saddr); 3113 } 3114 } 3115 3116 static void bond_ns_send_all(struct bonding *bond, struct slave *slave) 3117 { 3118 struct in6_addr *targets = bond->params.ns_targets; 3119 struct bond_vlan_tag *tags; 3120 struct dst_entry *dst; 3121 struct in6_addr saddr; 3122 struct flowi6 fl6; 3123 int i; 3124 3125 for (i = 0; i < BOND_MAX_NS_TARGETS && !ipv6_addr_any(&targets[i]); i++) { 3126 slave_dbg(bond->dev, slave->dev, "%s: target %pI6c\n", 3127 __func__, &targets[i]); 3128 tags = NULL; 3129 3130 /* Find out through which dev should the packet go */ 3131 memset(&fl6, 0, sizeof(struct flowi6)); 3132 fl6.daddr = targets[i]; 3133 fl6.flowi6_oif = bond->dev->ifindex; 3134 3135 dst = ip6_route_output(dev_net(bond->dev), NULL, &fl6); 3136 if (dst->error) { 3137 dst_release(dst); 3138 /* there's no route to target - try to send arp 3139 * probe to generate any traffic (arp_validate=0) 3140 */ 3141 if (bond->params.arp_validate) 3142 pr_warn_once("%s: no route to ns_ip6_target %pI6c and arp_validate is set\n", 3143 bond->dev->name, 3144 &targets[i]); 3145 bond_ns_send(slave, &targets[i], &in6addr_any, tags); 3146 continue; 3147 } 3148 3149 /* bond device itself */ 3150 if (dst->dev == bond->dev) 3151 goto found; 3152 3153 rcu_read_lock(); 3154 tags = bond_verify_device_path(bond->dev, dst->dev, 0); 3155 rcu_read_unlock(); 3156 3157 if (!IS_ERR_OR_NULL(tags)) 3158 goto found; 3159 3160 /* Not our device - skip */ 3161 slave_dbg(bond->dev, slave->dev, "no path to ns_ip6_target %pI6c via dst->dev %s\n", 3162 &targets[i], dst->dev ? dst->dev->name : "NULL"); 3163 3164 dst_release(dst); 3165 continue; 3166 3167 found: 3168 if (!ipv6_dev_get_saddr(dev_net(dst->dev), dst->dev, &targets[i], 0, &saddr)) 3169 bond_ns_send(slave, &targets[i], &saddr, tags); 3170 else 3171 bond_ns_send(slave, &targets[i], &in6addr_any, tags); 3172 3173 dst_release(dst); 3174 kfree(tags); 3175 } 3176 } 3177 3178 static int bond_confirm_addr6(struct net_device *dev, 3179 struct netdev_nested_priv *priv) 3180 { 3181 struct in6_addr *addr = (struct in6_addr *)priv->data; 3182 3183 return ipv6_chk_addr(dev_net(dev), addr, dev, 0); 3184 } 3185 3186 static bool bond_has_this_ip6(struct bonding *bond, struct in6_addr *addr) 3187 { 3188 struct netdev_nested_priv priv = { 3189 .data = addr, 3190 }; 3191 int ret = false; 3192 3193 if (bond_confirm_addr6(bond->dev, &priv)) 3194 return true; 3195 3196 rcu_read_lock(); 3197 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_confirm_addr6, &priv)) 3198 ret = true; 3199 rcu_read_unlock(); 3200 3201 return ret; 3202 } 3203 3204 static void bond_validate_na(struct bonding *bond, struct slave *slave, 3205 struct in6_addr *saddr, struct in6_addr *daddr) 3206 { 3207 int i; 3208 3209 /* Ignore NAs that: 3210 * 1. Source address is unspecified address. 3211 * 2. Dest address is neither all-nodes multicast address nor 3212 * exist on bond interface. 3213 */ 3214 if (ipv6_addr_any(saddr) || 3215 (!ipv6_addr_equal(daddr, &in6addr_linklocal_allnodes) && 3216 !bond_has_this_ip6(bond, daddr))) { 3217 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c tip %pI6c not found\n", 3218 __func__, saddr, daddr); 3219 return; 3220 } 3221 3222 i = bond_get_targets_ip6(bond->params.ns_targets, saddr); 3223 if (i == -1) { 3224 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c not found in targets\n", 3225 __func__, saddr); 3226 return; 3227 } 3228 slave->last_rx = jiffies; 3229 slave->target_last_arp_rx[i] = jiffies; 3230 } 3231 3232 static int bond_na_rcv(const struct sk_buff *skb, struct bonding *bond, 3233 struct slave *slave) 3234 { 3235 struct slave *curr_active_slave, *curr_arp_slave; 3236 struct icmp6hdr *hdr = icmp6_hdr(skb); 3237 struct in6_addr *saddr, *daddr; 3238 3239 if (skb->pkt_type == PACKET_OTHERHOST || 3240 skb->pkt_type == PACKET_LOOPBACK || 3241 hdr->icmp6_type != NDISC_NEIGHBOUR_ADVERTISEMENT) 3242 goto out; 3243 3244 saddr = &ipv6_hdr(skb)->saddr; 3245 daddr = &ipv6_hdr(skb)->daddr; 3246 3247 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI6c tip %pI6c\n", 3248 __func__, slave->dev->name, bond_slave_state(slave), 3249 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 3250 saddr, daddr); 3251 3252 curr_active_slave = rcu_dereference(bond->curr_active_slave); 3253 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 3254 3255 /* We 'trust' the received ARP enough to validate it if: 3256 * see bond_arp_rcv(). 3257 */ 3258 if (bond_is_active_slave(slave)) 3259 bond_validate_na(bond, slave, saddr, daddr); 3260 else if (curr_active_slave && 3261 time_after(slave_last_rx(bond, curr_active_slave), 3262 curr_active_slave->last_link_up)) 3263 bond_validate_na(bond, slave, saddr, daddr); 3264 else if (curr_arp_slave && 3265 bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1)) 3266 bond_validate_na(bond, slave, saddr, daddr); 3267 3268 out: 3269 return RX_HANDLER_ANOTHER; 3270 } 3271 #endif 3272 3273 int bond_rcv_validate(const struct sk_buff *skb, struct bonding *bond, 3274 struct slave *slave) 3275 { 3276 #if IS_ENABLED(CONFIG_IPV6) 3277 bool is_ipv6 = skb->protocol == __cpu_to_be16(ETH_P_IPV6); 3278 #endif 3279 bool is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP); 3280 3281 slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n", 3282 __func__, skb->dev->name); 3283 3284 /* Use arp validate logic for both ARP and NS */ 3285 if (!slave_do_arp_validate(bond, slave)) { 3286 if ((slave_do_arp_validate_only(bond) && is_arp) || 3287 #if IS_ENABLED(CONFIG_IPV6) 3288 (slave_do_arp_validate_only(bond) && is_ipv6) || 3289 #endif 3290 !slave_do_arp_validate_only(bond)) 3291 slave->last_rx = jiffies; 3292 return RX_HANDLER_ANOTHER; 3293 } else if (is_arp) { 3294 return bond_arp_rcv(skb, bond, slave); 3295 #if IS_ENABLED(CONFIG_IPV6) 3296 } else if (is_ipv6) { 3297 return bond_na_rcv(skb, bond, slave); 3298 #endif 3299 } else { 3300 return RX_HANDLER_ANOTHER; 3301 } 3302 } 3303 3304 static void bond_send_validate(struct bonding *bond, struct slave *slave) 3305 { 3306 bond_arp_send_all(bond, slave); 3307 #if IS_ENABLED(CONFIG_IPV6) 3308 bond_ns_send_all(bond, slave); 3309 #endif 3310 } 3311 3312 /* function to verify if we're in the arp_interval timeslice, returns true if 3313 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval + 3314 * arp_interval/2) . the arp_interval/2 is needed for really fast networks. 3315 */ 3316 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 3317 int mod) 3318 { 3319 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3320 3321 return time_in_range(jiffies, 3322 last_act - delta_in_ticks, 3323 last_act + mod * delta_in_ticks + delta_in_ticks/2); 3324 } 3325 3326 /* This function is called regularly to monitor each slave's link 3327 * ensuring that traffic is being sent and received when arp monitoring 3328 * is used in load-balancing mode. if the adapter has been dormant, then an 3329 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 3330 * arp monitoring in active backup mode. 3331 */ 3332 static void bond_loadbalance_arp_mon(struct bonding *bond) 3333 { 3334 struct slave *slave, *oldcurrent; 3335 struct list_head *iter; 3336 int do_failover = 0, slave_state_changed = 0; 3337 3338 if (!bond_has_slaves(bond)) 3339 goto re_arm; 3340 3341 rcu_read_lock(); 3342 3343 oldcurrent = rcu_dereference(bond->curr_active_slave); 3344 /* see if any of the previous devices are up now (i.e. they have 3345 * xmt and rcv traffic). the curr_active_slave does not come into 3346 * the picture unless it is null. also, slave->last_link_up is not 3347 * needed here because we send an arp on each slave and give a slave 3348 * as long as it needs to get the tx/rx within the delta. 3349 * TODO: what about up/down delay in arp mode? it wasn't here before 3350 * so it can wait 3351 */ 3352 bond_for_each_slave_rcu(bond, slave, iter) { 3353 unsigned long last_tx = slave_last_tx(slave); 3354 3355 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 3356 3357 if (slave->link != BOND_LINK_UP) { 3358 if (bond_time_in_interval(bond, last_tx, 1) && 3359 bond_time_in_interval(bond, slave->last_rx, 1)) { 3360 3361 bond_propose_link_state(slave, BOND_LINK_UP); 3362 slave_state_changed = 1; 3363 3364 /* primary_slave has no meaning in round-robin 3365 * mode. the window of a slave being up and 3366 * curr_active_slave being null after enslaving 3367 * is closed. 3368 */ 3369 if (!oldcurrent) { 3370 slave_info(bond->dev, slave->dev, "link status definitely up\n"); 3371 do_failover = 1; 3372 } else { 3373 slave_info(bond->dev, slave->dev, "interface is now up\n"); 3374 } 3375 } 3376 } else { 3377 /* slave->link == BOND_LINK_UP */ 3378 3379 /* not all switches will respond to an arp request 3380 * when the source ip is 0, so don't take the link down 3381 * if we don't know our ip yet 3382 */ 3383 if (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) || 3384 !bond_time_in_interval(bond, slave->last_rx, bond->params.missed_max)) { 3385 3386 bond_propose_link_state(slave, BOND_LINK_DOWN); 3387 slave_state_changed = 1; 3388 3389 if (slave->link_failure_count < UINT_MAX) 3390 slave->link_failure_count++; 3391 3392 slave_info(bond->dev, slave->dev, "interface is now down\n"); 3393 3394 if (slave == oldcurrent) 3395 do_failover = 1; 3396 } 3397 } 3398 3399 /* note: if switch is in round-robin mode, all links 3400 * must tx arp to ensure all links rx an arp - otherwise 3401 * links may oscillate or not come up at all; if switch is 3402 * in something like xor mode, there is nothing we can 3403 * do - all replies will be rx'ed on same link causing slaves 3404 * to be unstable during low/no traffic periods 3405 */ 3406 if (bond_slave_is_up(slave)) 3407 bond_send_validate(bond, slave); 3408 } 3409 3410 rcu_read_unlock(); 3411 3412 if (do_failover || slave_state_changed) { 3413 if (!rtnl_trylock()) 3414 goto re_arm; 3415 3416 bond_for_each_slave(bond, slave, iter) { 3417 if (slave->link_new_state != BOND_LINK_NOCHANGE) 3418 slave->link = slave->link_new_state; 3419 } 3420 3421 if (slave_state_changed) { 3422 bond_slave_state_change(bond); 3423 if (BOND_MODE(bond) == BOND_MODE_XOR) 3424 bond_update_slave_arr(bond, NULL); 3425 } 3426 if (do_failover) { 3427 block_netpoll_tx(); 3428 bond_select_active_slave(bond); 3429 unblock_netpoll_tx(); 3430 } 3431 rtnl_unlock(); 3432 } 3433 3434 re_arm: 3435 if (bond->params.arp_interval) 3436 queue_delayed_work(bond->wq, &bond->arp_work, 3437 msecs_to_jiffies(bond->params.arp_interval)); 3438 } 3439 3440 /* Called to inspect slaves for active-backup mode ARP monitor link state 3441 * changes. Sets proposed link state in slaves to specify what action 3442 * should take place for the slave. Returns 0 if no changes are found, >0 3443 * if changes to link states must be committed. 3444 * 3445 * Called with rcu_read_lock held. 3446 */ 3447 static int bond_ab_arp_inspect(struct bonding *bond) 3448 { 3449 unsigned long last_tx, last_rx; 3450 struct list_head *iter; 3451 struct slave *slave; 3452 int commit = 0; 3453 3454 bond_for_each_slave_rcu(bond, slave, iter) { 3455 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 3456 last_rx = slave_last_rx(bond, slave); 3457 3458 if (slave->link != BOND_LINK_UP) { 3459 if (bond_time_in_interval(bond, last_rx, 1)) { 3460 bond_propose_link_state(slave, BOND_LINK_UP); 3461 commit++; 3462 } else if (slave->link == BOND_LINK_BACK) { 3463 bond_propose_link_state(slave, BOND_LINK_FAIL); 3464 commit++; 3465 } 3466 continue; 3467 } 3468 3469 /* Give slaves 2*delta after being enslaved or made 3470 * active. This avoids bouncing, as the last receive 3471 * times need a full ARP monitor cycle to be updated. 3472 */ 3473 if (bond_time_in_interval(bond, slave->last_link_up, 2)) 3474 continue; 3475 3476 /* Backup slave is down if: 3477 * - No current_arp_slave AND 3478 * - more than (missed_max+1)*delta since last receive AND 3479 * - the bond has an IP address 3480 * 3481 * Note: a non-null current_arp_slave indicates 3482 * the curr_active_slave went down and we are 3483 * searching for a new one; under this condition 3484 * we only take the curr_active_slave down - this 3485 * gives each slave a chance to tx/rx traffic 3486 * before being taken out 3487 */ 3488 if (!bond_is_active_slave(slave) && 3489 !rcu_access_pointer(bond->current_arp_slave) && 3490 !bond_time_in_interval(bond, last_rx, bond->params.missed_max + 1)) { 3491 bond_propose_link_state(slave, BOND_LINK_DOWN); 3492 commit++; 3493 } 3494 3495 /* Active slave is down if: 3496 * - more than missed_max*delta since transmitting OR 3497 * - (more than missed_max*delta since receive AND 3498 * the bond has an IP address) 3499 */ 3500 last_tx = slave_last_tx(slave); 3501 if (bond_is_active_slave(slave) && 3502 (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) || 3503 !bond_time_in_interval(bond, last_rx, bond->params.missed_max))) { 3504 bond_propose_link_state(slave, BOND_LINK_DOWN); 3505 commit++; 3506 } 3507 } 3508 3509 return commit; 3510 } 3511 3512 /* Called to commit link state changes noted by inspection step of 3513 * active-backup mode ARP monitor. 3514 * 3515 * Called with RTNL hold. 3516 */ 3517 static void bond_ab_arp_commit(struct bonding *bond) 3518 { 3519 struct list_head *iter; 3520 unsigned long last_tx; 3521 struct slave *slave; 3522 3523 bond_for_each_slave(bond, slave, iter) { 3524 switch (slave->link_new_state) { 3525 case BOND_LINK_NOCHANGE: 3526 continue; 3527 3528 case BOND_LINK_UP: 3529 last_tx = slave_last_tx(slave); 3530 if (rtnl_dereference(bond->curr_active_slave) != slave || 3531 (!rtnl_dereference(bond->curr_active_slave) && 3532 bond_time_in_interval(bond, last_tx, 1))) { 3533 struct slave *current_arp_slave; 3534 3535 current_arp_slave = rtnl_dereference(bond->current_arp_slave); 3536 bond_set_slave_link_state(slave, BOND_LINK_UP, 3537 BOND_SLAVE_NOTIFY_NOW); 3538 if (current_arp_slave) { 3539 bond_set_slave_inactive_flags( 3540 current_arp_slave, 3541 BOND_SLAVE_NOTIFY_NOW); 3542 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3543 } 3544 3545 slave_info(bond->dev, slave->dev, "link status definitely up\n"); 3546 3547 if (!rtnl_dereference(bond->curr_active_slave) || 3548 slave == rtnl_dereference(bond->primary_slave)) 3549 goto do_failover; 3550 3551 } 3552 3553 continue; 3554 3555 case BOND_LINK_DOWN: 3556 if (slave->link_failure_count < UINT_MAX) 3557 slave->link_failure_count++; 3558 3559 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 3560 BOND_SLAVE_NOTIFY_NOW); 3561 bond_set_slave_inactive_flags(slave, 3562 BOND_SLAVE_NOTIFY_NOW); 3563 3564 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n"); 3565 3566 if (slave == rtnl_dereference(bond->curr_active_slave)) { 3567 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3568 goto do_failover; 3569 } 3570 3571 continue; 3572 3573 case BOND_LINK_FAIL: 3574 bond_set_slave_link_state(slave, BOND_LINK_FAIL, 3575 BOND_SLAVE_NOTIFY_NOW); 3576 bond_set_slave_inactive_flags(slave, 3577 BOND_SLAVE_NOTIFY_NOW); 3578 3579 /* A slave has just been enslaved and has become 3580 * the current active slave. 3581 */ 3582 if (rtnl_dereference(bond->curr_active_slave)) 3583 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3584 continue; 3585 3586 default: 3587 slave_err(bond->dev, slave->dev, 3588 "impossible: link_new_state %d on slave\n", 3589 slave->link_new_state); 3590 continue; 3591 } 3592 3593 do_failover: 3594 block_netpoll_tx(); 3595 bond_select_active_slave(bond); 3596 unblock_netpoll_tx(); 3597 } 3598 3599 bond_set_carrier(bond); 3600 } 3601 3602 /* Send ARP probes for active-backup mode ARP monitor. 3603 * 3604 * Called with rcu_read_lock held. 3605 */ 3606 static bool bond_ab_arp_probe(struct bonding *bond) 3607 { 3608 struct slave *slave, *before = NULL, *new_slave = NULL, 3609 *curr_arp_slave = rcu_dereference(bond->current_arp_slave), 3610 *curr_active_slave = rcu_dereference(bond->curr_active_slave); 3611 struct list_head *iter; 3612 bool found = false; 3613 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; 3614 3615 if (curr_arp_slave && curr_active_slave) 3616 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n", 3617 curr_arp_slave->dev->name, 3618 curr_active_slave->dev->name); 3619 3620 if (curr_active_slave) { 3621 bond_send_validate(bond, curr_active_slave); 3622 return should_notify_rtnl; 3623 } 3624 3625 /* if we don't have a curr_active_slave, search for the next available 3626 * backup slave from the current_arp_slave and make it the candidate 3627 * for becoming the curr_active_slave 3628 */ 3629 3630 if (!curr_arp_slave) { 3631 curr_arp_slave = bond_first_slave_rcu(bond); 3632 if (!curr_arp_slave) 3633 return should_notify_rtnl; 3634 } 3635 3636 bond_for_each_slave_rcu(bond, slave, iter) { 3637 if (!found && !before && bond_slave_is_up(slave)) 3638 before = slave; 3639 3640 if (found && !new_slave && bond_slave_is_up(slave)) 3641 new_slave = slave; 3642 /* if the link state is up at this point, we 3643 * mark it down - this can happen if we have 3644 * simultaneous link failures and 3645 * reselect_active_interface doesn't make this 3646 * one the current slave so it is still marked 3647 * up when it is actually down 3648 */ 3649 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 3650 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 3651 BOND_SLAVE_NOTIFY_LATER); 3652 if (slave->link_failure_count < UINT_MAX) 3653 slave->link_failure_count++; 3654 3655 bond_set_slave_inactive_flags(slave, 3656 BOND_SLAVE_NOTIFY_LATER); 3657 3658 slave_info(bond->dev, slave->dev, "backup interface is now down\n"); 3659 } 3660 if (slave == curr_arp_slave) 3661 found = true; 3662 } 3663 3664 if (!new_slave && before) 3665 new_slave = before; 3666 3667 if (!new_slave) 3668 goto check_state; 3669 3670 bond_set_slave_link_state(new_slave, BOND_LINK_BACK, 3671 BOND_SLAVE_NOTIFY_LATER); 3672 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER); 3673 bond_send_validate(bond, new_slave); 3674 new_slave->last_link_up = jiffies; 3675 rcu_assign_pointer(bond->current_arp_slave, new_slave); 3676 3677 check_state: 3678 bond_for_each_slave_rcu(bond, slave, iter) { 3679 if (slave->should_notify || slave->should_notify_link) { 3680 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; 3681 break; 3682 } 3683 } 3684 return should_notify_rtnl; 3685 } 3686 3687 static void bond_activebackup_arp_mon(struct bonding *bond) 3688 { 3689 bool should_notify_peers = false; 3690 bool should_notify_rtnl = false; 3691 int delta_in_ticks; 3692 3693 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3694 3695 if (!bond_has_slaves(bond)) 3696 goto re_arm; 3697 3698 rcu_read_lock(); 3699 3700 should_notify_peers = bond_should_notify_peers(bond); 3701 3702 if (bond_ab_arp_inspect(bond)) { 3703 rcu_read_unlock(); 3704 3705 /* Race avoidance with bond_close flush of workqueue */ 3706 if (!rtnl_trylock()) { 3707 delta_in_ticks = 1; 3708 should_notify_peers = false; 3709 goto re_arm; 3710 } 3711 3712 bond_ab_arp_commit(bond); 3713 3714 rtnl_unlock(); 3715 rcu_read_lock(); 3716 } 3717 3718 should_notify_rtnl = bond_ab_arp_probe(bond); 3719 rcu_read_unlock(); 3720 3721 re_arm: 3722 if (bond->params.arp_interval) 3723 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 3724 3725 if (should_notify_peers || should_notify_rtnl) { 3726 if (!rtnl_trylock()) 3727 return; 3728 3729 if (should_notify_peers) { 3730 bond->send_peer_notif--; 3731 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 3732 bond->dev); 3733 } 3734 if (should_notify_rtnl) { 3735 bond_slave_state_notify(bond); 3736 bond_slave_link_notify(bond); 3737 } 3738 3739 rtnl_unlock(); 3740 } 3741 } 3742 3743 static void bond_arp_monitor(struct work_struct *work) 3744 { 3745 struct bonding *bond = container_of(work, struct bonding, 3746 arp_work.work); 3747 3748 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3749 bond_activebackup_arp_mon(bond); 3750 else 3751 bond_loadbalance_arp_mon(bond); 3752 } 3753 3754 /*-------------------------- netdev event handling --------------------------*/ 3755 3756 /* Change device name */ 3757 static int bond_event_changename(struct bonding *bond) 3758 { 3759 bond_remove_proc_entry(bond); 3760 bond_create_proc_entry(bond); 3761 3762 bond_debug_reregister(bond); 3763 3764 return NOTIFY_DONE; 3765 } 3766 3767 static int bond_master_netdev_event(unsigned long event, 3768 struct net_device *bond_dev) 3769 { 3770 struct bonding *event_bond = netdev_priv(bond_dev); 3771 3772 netdev_dbg(bond_dev, "%s called\n", __func__); 3773 3774 switch (event) { 3775 case NETDEV_CHANGENAME: 3776 return bond_event_changename(event_bond); 3777 case NETDEV_UNREGISTER: 3778 bond_remove_proc_entry(event_bond); 3779 #ifdef CONFIG_XFRM_OFFLOAD 3780 xfrm_dev_state_flush(dev_net(bond_dev), bond_dev, true); 3781 #endif /* CONFIG_XFRM_OFFLOAD */ 3782 break; 3783 case NETDEV_REGISTER: 3784 bond_create_proc_entry(event_bond); 3785 break; 3786 default: 3787 break; 3788 } 3789 3790 return NOTIFY_DONE; 3791 } 3792 3793 static int bond_slave_netdev_event(unsigned long event, 3794 struct net_device *slave_dev) 3795 { 3796 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary; 3797 struct bonding *bond; 3798 struct net_device *bond_dev; 3799 3800 /* A netdev event can be generated while enslaving a device 3801 * before netdev_rx_handler_register is called in which case 3802 * slave will be NULL 3803 */ 3804 if (!slave) { 3805 netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__); 3806 return NOTIFY_DONE; 3807 } 3808 3809 bond_dev = slave->bond->dev; 3810 bond = slave->bond; 3811 primary = rtnl_dereference(bond->primary_slave); 3812 3813 slave_dbg(bond_dev, slave_dev, "%s called\n", __func__); 3814 3815 switch (event) { 3816 case NETDEV_UNREGISTER: 3817 if (bond_dev->type != ARPHRD_ETHER) 3818 bond_release_and_destroy(bond_dev, slave_dev); 3819 else 3820 __bond_release_one(bond_dev, slave_dev, false, true); 3821 break; 3822 case NETDEV_UP: 3823 case NETDEV_CHANGE: 3824 /* For 802.3ad mode only: 3825 * Getting invalid Speed/Duplex values here will put slave 3826 * in weird state. Mark it as link-fail if the link was 3827 * previously up or link-down if it hasn't yet come up, and 3828 * let link-monitoring (miimon) set it right when correct 3829 * speeds/duplex are available. 3830 */ 3831 if (bond_update_speed_duplex(slave) && 3832 BOND_MODE(bond) == BOND_MODE_8023AD) { 3833 if (slave->last_link_up) 3834 slave->link = BOND_LINK_FAIL; 3835 else 3836 slave->link = BOND_LINK_DOWN; 3837 } 3838 3839 if (BOND_MODE(bond) == BOND_MODE_8023AD) 3840 bond_3ad_adapter_speed_duplex_changed(slave); 3841 fallthrough; 3842 case NETDEV_DOWN: 3843 /* Refresh slave-array if applicable! 3844 * If the setup does not use miimon or arpmon (mode-specific!), 3845 * then these events will not cause the slave-array to be 3846 * refreshed. This will cause xmit to use a slave that is not 3847 * usable. Avoid such situation by refeshing the array at these 3848 * events. If these (miimon/arpmon) parameters are configured 3849 * then array gets refreshed twice and that should be fine! 3850 */ 3851 if (bond_mode_can_use_xmit_hash(bond)) 3852 bond_update_slave_arr(bond, NULL); 3853 break; 3854 case NETDEV_CHANGEMTU: 3855 /* TODO: Should slaves be allowed to 3856 * independently alter their MTU? For 3857 * an active-backup bond, slaves need 3858 * not be the same type of device, so 3859 * MTUs may vary. For other modes, 3860 * slaves arguably should have the 3861 * same MTUs. To do this, we'd need to 3862 * take over the slave's change_mtu 3863 * function for the duration of their 3864 * servitude. 3865 */ 3866 break; 3867 case NETDEV_CHANGENAME: 3868 /* we don't care if we don't have primary set */ 3869 if (!bond_uses_primary(bond) || 3870 !bond->params.primary[0]) 3871 break; 3872 3873 if (slave == primary) { 3874 /* slave's name changed - he's no longer primary */ 3875 RCU_INIT_POINTER(bond->primary_slave, NULL); 3876 } else if (!strcmp(slave_dev->name, bond->params.primary)) { 3877 /* we have a new primary slave */ 3878 rcu_assign_pointer(bond->primary_slave, slave); 3879 } else { /* we didn't change primary - exit */ 3880 break; 3881 } 3882 3883 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n", 3884 primary ? slave_dev->name : "none"); 3885 3886 block_netpoll_tx(); 3887 bond_select_active_slave(bond); 3888 unblock_netpoll_tx(); 3889 break; 3890 case NETDEV_FEAT_CHANGE: 3891 bond_compute_features(bond); 3892 break; 3893 case NETDEV_RESEND_IGMP: 3894 /* Propagate to master device */ 3895 call_netdevice_notifiers(event, slave->bond->dev); 3896 break; 3897 default: 3898 break; 3899 } 3900 3901 return NOTIFY_DONE; 3902 } 3903 3904 /* bond_netdev_event: handle netdev notifier chain events. 3905 * 3906 * This function receives events for the netdev chain. The caller (an 3907 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 3908 * locks for us to safely manipulate the slave devices (RTNL lock, 3909 * dev_probe_lock). 3910 */ 3911 static int bond_netdev_event(struct notifier_block *this, 3912 unsigned long event, void *ptr) 3913 { 3914 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 3915 3916 netdev_dbg(event_dev, "%s received %s\n", 3917 __func__, netdev_cmd_to_name(event)); 3918 3919 if (!(event_dev->priv_flags & IFF_BONDING)) 3920 return NOTIFY_DONE; 3921 3922 if (event_dev->flags & IFF_MASTER) { 3923 int ret; 3924 3925 ret = bond_master_netdev_event(event, event_dev); 3926 if (ret != NOTIFY_DONE) 3927 return ret; 3928 } 3929 3930 if (event_dev->flags & IFF_SLAVE) 3931 return bond_slave_netdev_event(event, event_dev); 3932 3933 return NOTIFY_DONE; 3934 } 3935 3936 static struct notifier_block bond_netdev_notifier = { 3937 .notifier_call = bond_netdev_event, 3938 }; 3939 3940 /*---------------------------- Hashing Policies -----------------------------*/ 3941 3942 /* Helper to access data in a packet, with or without a backing skb. 3943 * If skb is given the data is linearized if necessary via pskb_may_pull. 3944 */ 3945 static inline const void *bond_pull_data(struct sk_buff *skb, 3946 const void *data, int hlen, int n) 3947 { 3948 if (likely(n <= hlen)) 3949 return data; 3950 else if (skb && likely(pskb_may_pull(skb, n))) 3951 return skb->head; 3952 3953 return NULL; 3954 } 3955 3956 /* L2 hash helper */ 3957 static inline u32 bond_eth_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen) 3958 { 3959 struct ethhdr *ep; 3960 3961 data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr)); 3962 if (!data) 3963 return 0; 3964 3965 ep = (struct ethhdr *)(data + mhoff); 3966 return ep->h_dest[5] ^ ep->h_source[5] ^ be16_to_cpu(ep->h_proto); 3967 } 3968 3969 static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk, const void *data, 3970 int hlen, __be16 l2_proto, int *nhoff, int *ip_proto, bool l34) 3971 { 3972 const struct ipv6hdr *iph6; 3973 const struct iphdr *iph; 3974 3975 if (l2_proto == htons(ETH_P_IP)) { 3976 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph)); 3977 if (!data) 3978 return false; 3979 3980 iph = (const struct iphdr *)(data + *nhoff); 3981 iph_to_flow_copy_v4addrs(fk, iph); 3982 *nhoff += iph->ihl << 2; 3983 if (!ip_is_fragment(iph)) 3984 *ip_proto = iph->protocol; 3985 } else if (l2_proto == htons(ETH_P_IPV6)) { 3986 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph6)); 3987 if (!data) 3988 return false; 3989 3990 iph6 = (const struct ipv6hdr *)(data + *nhoff); 3991 iph_to_flow_copy_v6addrs(fk, iph6); 3992 *nhoff += sizeof(*iph6); 3993 *ip_proto = iph6->nexthdr; 3994 } else { 3995 return false; 3996 } 3997 3998 if (l34 && *ip_proto >= 0) 3999 fk->ports.ports = __skb_flow_get_ports(skb, *nhoff, *ip_proto, data, hlen); 4000 4001 return true; 4002 } 4003 4004 static u32 bond_vlan_srcmac_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen) 4005 { 4006 u32 srcmac_vendor = 0, srcmac_dev = 0; 4007 struct ethhdr *mac_hdr; 4008 u16 vlan = 0; 4009 int i; 4010 4011 data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr)); 4012 if (!data) 4013 return 0; 4014 mac_hdr = (struct ethhdr *)(data + mhoff); 4015 4016 for (i = 0; i < 3; i++) 4017 srcmac_vendor = (srcmac_vendor << 8) | mac_hdr->h_source[i]; 4018 4019 for (i = 3; i < ETH_ALEN; i++) 4020 srcmac_dev = (srcmac_dev << 8) | mac_hdr->h_source[i]; 4021 4022 if (skb && skb_vlan_tag_present(skb)) 4023 vlan = skb_vlan_tag_get(skb); 4024 4025 return vlan ^ srcmac_vendor ^ srcmac_dev; 4026 } 4027 4028 /* Extract the appropriate headers based on bond's xmit policy */ 4029 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, const void *data, 4030 __be16 l2_proto, int nhoff, int hlen, struct flow_keys *fk) 4031 { 4032 bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34; 4033 int ip_proto = -1; 4034 4035 switch (bond->params.xmit_policy) { 4036 case BOND_XMIT_POLICY_ENCAP23: 4037 case BOND_XMIT_POLICY_ENCAP34: 4038 memset(fk, 0, sizeof(*fk)); 4039 return __skb_flow_dissect(NULL, skb, &flow_keys_bonding, 4040 fk, data, l2_proto, nhoff, hlen, 0); 4041 default: 4042 break; 4043 } 4044 4045 fk->ports.ports = 0; 4046 memset(&fk->icmp, 0, sizeof(fk->icmp)); 4047 if (!bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34)) 4048 return false; 4049 4050 /* ICMP error packets contains at least 8 bytes of the header 4051 * of the packet which generated the error. Use this information 4052 * to correlate ICMP error packets within the same flow which 4053 * generated the error. 4054 */ 4055 if (ip_proto == IPPROTO_ICMP || ip_proto == IPPROTO_ICMPV6) { 4056 skb_flow_get_icmp_tci(skb, &fk->icmp, data, nhoff, hlen); 4057 if (ip_proto == IPPROTO_ICMP) { 4058 if (!icmp_is_err(fk->icmp.type)) 4059 return true; 4060 4061 nhoff += sizeof(struct icmphdr); 4062 } else if (ip_proto == IPPROTO_ICMPV6) { 4063 if (!icmpv6_is_err(fk->icmp.type)) 4064 return true; 4065 4066 nhoff += sizeof(struct icmp6hdr); 4067 } 4068 return bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34); 4069 } 4070 4071 return true; 4072 } 4073 4074 static u32 bond_ip_hash(u32 hash, struct flow_keys *flow, int xmit_policy) 4075 { 4076 hash ^= (__force u32)flow_get_u32_dst(flow) ^ 4077 (__force u32)flow_get_u32_src(flow); 4078 hash ^= (hash >> 16); 4079 hash ^= (hash >> 8); 4080 4081 /* discard lowest hash bit to deal with the common even ports pattern */ 4082 if (xmit_policy == BOND_XMIT_POLICY_LAYER34 || 4083 xmit_policy == BOND_XMIT_POLICY_ENCAP34) 4084 return hash >> 1; 4085 4086 return hash; 4087 } 4088 4089 /* Generate hash based on xmit policy. If @skb is given it is used to linearize 4090 * the data as required, but this function can be used without it if the data is 4091 * known to be linear (e.g. with xdp_buff). 4092 */ 4093 static u32 __bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, const void *data, 4094 __be16 l2_proto, int mhoff, int nhoff, int hlen) 4095 { 4096 struct flow_keys flow; 4097 u32 hash; 4098 4099 if (bond->params.xmit_policy == BOND_XMIT_POLICY_VLAN_SRCMAC) 4100 return bond_vlan_srcmac_hash(skb, data, mhoff, hlen); 4101 4102 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 || 4103 !bond_flow_dissect(bond, skb, data, l2_proto, nhoff, hlen, &flow)) 4104 return bond_eth_hash(skb, data, mhoff, hlen); 4105 4106 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 || 4107 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) { 4108 hash = bond_eth_hash(skb, data, mhoff, hlen); 4109 } else { 4110 if (flow.icmp.id) 4111 memcpy(&hash, &flow.icmp, sizeof(hash)); 4112 else 4113 memcpy(&hash, &flow.ports.ports, sizeof(hash)); 4114 } 4115 4116 return bond_ip_hash(hash, &flow, bond->params.xmit_policy); 4117 } 4118 4119 /** 4120 * bond_xmit_hash - generate a hash value based on the xmit policy 4121 * @bond: bonding device 4122 * @skb: buffer to use for headers 4123 * 4124 * This function will extract the necessary headers from the skb buffer and use 4125 * them to generate a hash based on the xmit_policy set in the bonding device 4126 */ 4127 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb) 4128 { 4129 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 && 4130 skb->l4_hash) 4131 return skb->hash; 4132 4133 return __bond_xmit_hash(bond, skb, skb->data, skb->protocol, 4134 skb_mac_offset(skb), skb_network_offset(skb), 4135 skb_headlen(skb)); 4136 } 4137 4138 /** 4139 * bond_xmit_hash_xdp - generate a hash value based on the xmit policy 4140 * @bond: bonding device 4141 * @xdp: buffer to use for headers 4142 * 4143 * The XDP variant of bond_xmit_hash. 4144 */ 4145 static u32 bond_xmit_hash_xdp(struct bonding *bond, struct xdp_buff *xdp) 4146 { 4147 struct ethhdr *eth; 4148 4149 if (xdp->data + sizeof(struct ethhdr) > xdp->data_end) 4150 return 0; 4151 4152 eth = (struct ethhdr *)xdp->data; 4153 4154 return __bond_xmit_hash(bond, NULL, xdp->data, eth->h_proto, 0, 4155 sizeof(struct ethhdr), xdp->data_end - xdp->data); 4156 } 4157 4158 /*-------------------------- Device entry points ----------------------------*/ 4159 4160 void bond_work_init_all(struct bonding *bond) 4161 { 4162 INIT_DELAYED_WORK(&bond->mcast_work, 4163 bond_resend_igmp_join_requests_delayed); 4164 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 4165 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 4166 INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor); 4167 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 4168 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler); 4169 } 4170 4171 static void bond_work_cancel_all(struct bonding *bond) 4172 { 4173 cancel_delayed_work_sync(&bond->mii_work); 4174 cancel_delayed_work_sync(&bond->arp_work); 4175 cancel_delayed_work_sync(&bond->alb_work); 4176 cancel_delayed_work_sync(&bond->ad_work); 4177 cancel_delayed_work_sync(&bond->mcast_work); 4178 cancel_delayed_work_sync(&bond->slave_arr_work); 4179 } 4180 4181 static int bond_open(struct net_device *bond_dev) 4182 { 4183 struct bonding *bond = netdev_priv(bond_dev); 4184 struct list_head *iter; 4185 struct slave *slave; 4186 4187 /* reset slave->backup and slave->inactive */ 4188 if (bond_has_slaves(bond)) { 4189 bond_for_each_slave(bond, slave, iter) { 4190 if (bond_uses_primary(bond) && 4191 slave != rcu_access_pointer(bond->curr_active_slave)) { 4192 bond_set_slave_inactive_flags(slave, 4193 BOND_SLAVE_NOTIFY_NOW); 4194 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) { 4195 bond_set_slave_active_flags(slave, 4196 BOND_SLAVE_NOTIFY_NOW); 4197 } 4198 } 4199 } 4200 4201 if (bond_is_lb(bond)) { 4202 /* bond_alb_initialize must be called before the timer 4203 * is started. 4204 */ 4205 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB))) 4206 return -ENOMEM; 4207 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB) 4208 queue_delayed_work(bond->wq, &bond->alb_work, 0); 4209 } 4210 4211 if (bond->params.miimon) /* link check interval, in milliseconds. */ 4212 queue_delayed_work(bond->wq, &bond->mii_work, 0); 4213 4214 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 4215 queue_delayed_work(bond->wq, &bond->arp_work, 0); 4216 bond->recv_probe = bond_rcv_validate; 4217 } 4218 4219 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 4220 queue_delayed_work(bond->wq, &bond->ad_work, 0); 4221 /* register to receive LACPDUs */ 4222 bond->recv_probe = bond_3ad_lacpdu_recv; 4223 bond_3ad_initiate_agg_selection(bond, 1); 4224 } 4225 4226 if (bond_mode_can_use_xmit_hash(bond)) 4227 bond_update_slave_arr(bond, NULL); 4228 4229 return 0; 4230 } 4231 4232 static int bond_close(struct net_device *bond_dev) 4233 { 4234 struct bonding *bond = netdev_priv(bond_dev); 4235 4236 bond_work_cancel_all(bond); 4237 bond->send_peer_notif = 0; 4238 if (bond_is_lb(bond)) 4239 bond_alb_deinitialize(bond); 4240 bond->recv_probe = NULL; 4241 4242 return 0; 4243 } 4244 4245 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but 4246 * that some drivers can provide 32bit values only. 4247 */ 4248 static void bond_fold_stats(struct rtnl_link_stats64 *_res, 4249 const struct rtnl_link_stats64 *_new, 4250 const struct rtnl_link_stats64 *_old) 4251 { 4252 const u64 *new = (const u64 *)_new; 4253 const u64 *old = (const u64 *)_old; 4254 u64 *res = (u64 *)_res; 4255 int i; 4256 4257 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) { 4258 u64 nv = new[i]; 4259 u64 ov = old[i]; 4260 s64 delta = nv - ov; 4261 4262 /* detects if this particular field is 32bit only */ 4263 if (((nv | ov) >> 32) == 0) 4264 delta = (s64)(s32)((u32)nv - (u32)ov); 4265 4266 /* filter anomalies, some drivers reset their stats 4267 * at down/up events. 4268 */ 4269 if (delta > 0) 4270 res[i] += delta; 4271 } 4272 } 4273 4274 #ifdef CONFIG_LOCKDEP 4275 static int bond_get_lowest_level_rcu(struct net_device *dev) 4276 { 4277 struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; 4278 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; 4279 int cur = 0, max = 0; 4280 4281 now = dev; 4282 iter = &dev->adj_list.lower; 4283 4284 while (1) { 4285 next = NULL; 4286 while (1) { 4287 ldev = netdev_next_lower_dev_rcu(now, &iter); 4288 if (!ldev) 4289 break; 4290 4291 next = ldev; 4292 niter = &ldev->adj_list.lower; 4293 dev_stack[cur] = now; 4294 iter_stack[cur++] = iter; 4295 if (max <= cur) 4296 max = cur; 4297 break; 4298 } 4299 4300 if (!next) { 4301 if (!cur) 4302 return max; 4303 next = dev_stack[--cur]; 4304 niter = iter_stack[cur]; 4305 } 4306 4307 now = next; 4308 iter = niter; 4309 } 4310 4311 return max; 4312 } 4313 #endif 4314 4315 static void bond_get_stats(struct net_device *bond_dev, 4316 struct rtnl_link_stats64 *stats) 4317 { 4318 struct bonding *bond = netdev_priv(bond_dev); 4319 struct rtnl_link_stats64 temp; 4320 struct list_head *iter; 4321 struct slave *slave; 4322 int nest_level = 0; 4323 4324 4325 rcu_read_lock(); 4326 #ifdef CONFIG_LOCKDEP 4327 nest_level = bond_get_lowest_level_rcu(bond_dev); 4328 #endif 4329 4330 spin_lock_nested(&bond->stats_lock, nest_level); 4331 memcpy(stats, &bond->bond_stats, sizeof(*stats)); 4332 4333 bond_for_each_slave_rcu(bond, slave, iter) { 4334 const struct rtnl_link_stats64 *new = 4335 dev_get_stats(slave->dev, &temp); 4336 4337 bond_fold_stats(stats, new, &slave->slave_stats); 4338 4339 /* save off the slave stats for the next run */ 4340 memcpy(&slave->slave_stats, new, sizeof(*new)); 4341 } 4342 4343 memcpy(&bond->bond_stats, stats, sizeof(*stats)); 4344 spin_unlock(&bond->stats_lock); 4345 rcu_read_unlock(); 4346 } 4347 4348 static int bond_eth_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 4349 { 4350 struct bonding *bond = netdev_priv(bond_dev); 4351 struct mii_ioctl_data *mii = NULL; 4352 const struct net_device_ops *ops; 4353 struct net_device *real_dev; 4354 struct hwtstamp_config cfg; 4355 struct ifreq ifrr; 4356 int res = 0; 4357 4358 netdev_dbg(bond_dev, "bond_eth_ioctl: cmd=%d\n", cmd); 4359 4360 switch (cmd) { 4361 case SIOCGMIIPHY: 4362 mii = if_mii(ifr); 4363 if (!mii) 4364 return -EINVAL; 4365 4366 mii->phy_id = 0; 4367 fallthrough; 4368 case SIOCGMIIREG: 4369 /* We do this again just in case we were called by SIOCGMIIREG 4370 * instead of SIOCGMIIPHY. 4371 */ 4372 mii = if_mii(ifr); 4373 if (!mii) 4374 return -EINVAL; 4375 4376 if (mii->reg_num == 1) { 4377 mii->val_out = 0; 4378 if (netif_carrier_ok(bond->dev)) 4379 mii->val_out = BMSR_LSTATUS; 4380 } 4381 4382 break; 4383 case SIOCSHWTSTAMP: 4384 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) 4385 return -EFAULT; 4386 4387 if (!(cfg.flags & HWTSTAMP_FLAG_BONDED_PHC_INDEX)) 4388 return -EOPNOTSUPP; 4389 4390 fallthrough; 4391 case SIOCGHWTSTAMP: 4392 real_dev = bond_option_active_slave_get_rcu(bond); 4393 if (!real_dev) 4394 return -EOPNOTSUPP; 4395 4396 strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ); 4397 ifrr.ifr_ifru = ifr->ifr_ifru; 4398 4399 ops = real_dev->netdev_ops; 4400 if (netif_device_present(real_dev) && ops->ndo_eth_ioctl) { 4401 res = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd); 4402 if (res) 4403 return res; 4404 4405 ifr->ifr_ifru = ifrr.ifr_ifru; 4406 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) 4407 return -EFAULT; 4408 4409 /* Set the BOND_PHC_INDEX flag to notify user space */ 4410 cfg.flags |= HWTSTAMP_FLAG_BONDED_PHC_INDEX; 4411 4412 return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? 4413 -EFAULT : 0; 4414 } 4415 fallthrough; 4416 default: 4417 res = -EOPNOTSUPP; 4418 } 4419 4420 return res; 4421 } 4422 4423 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 4424 { 4425 struct bonding *bond = netdev_priv(bond_dev); 4426 struct net_device *slave_dev = NULL; 4427 struct ifbond k_binfo; 4428 struct ifbond __user *u_binfo = NULL; 4429 struct ifslave k_sinfo; 4430 struct ifslave __user *u_sinfo = NULL; 4431 struct bond_opt_value newval; 4432 struct net *net; 4433 int res = 0; 4434 4435 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd); 4436 4437 switch (cmd) { 4438 case SIOCBONDINFOQUERY: 4439 u_binfo = (struct ifbond __user *)ifr->ifr_data; 4440 4441 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 4442 return -EFAULT; 4443 4444 bond_info_query(bond_dev, &k_binfo); 4445 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 4446 return -EFAULT; 4447 4448 return 0; 4449 case SIOCBONDSLAVEINFOQUERY: 4450 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 4451 4452 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 4453 return -EFAULT; 4454 4455 res = bond_slave_info_query(bond_dev, &k_sinfo); 4456 if (res == 0 && 4457 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 4458 return -EFAULT; 4459 4460 return res; 4461 default: 4462 break; 4463 } 4464 4465 net = dev_net(bond_dev); 4466 4467 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 4468 return -EPERM; 4469 4470 slave_dev = __dev_get_by_name(net, ifr->ifr_slave); 4471 4472 slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev); 4473 4474 if (!slave_dev) 4475 return -ENODEV; 4476 4477 switch (cmd) { 4478 case SIOCBONDENSLAVE: 4479 res = bond_enslave(bond_dev, slave_dev, NULL); 4480 break; 4481 case SIOCBONDRELEASE: 4482 res = bond_release(bond_dev, slave_dev); 4483 break; 4484 case SIOCBONDSETHWADDR: 4485 res = bond_set_dev_addr(bond_dev, slave_dev); 4486 break; 4487 case SIOCBONDCHANGEACTIVE: 4488 bond_opt_initstr(&newval, slave_dev->name); 4489 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE, 4490 &newval); 4491 break; 4492 default: 4493 res = -EOPNOTSUPP; 4494 } 4495 4496 return res; 4497 } 4498 4499 static int bond_siocdevprivate(struct net_device *bond_dev, struct ifreq *ifr, 4500 void __user *data, int cmd) 4501 { 4502 struct ifreq ifrdata = { .ifr_data = data }; 4503 4504 switch (cmd) { 4505 case BOND_INFO_QUERY_OLD: 4506 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDINFOQUERY); 4507 case BOND_SLAVE_INFO_QUERY_OLD: 4508 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDSLAVEINFOQUERY); 4509 case BOND_ENSLAVE_OLD: 4510 return bond_do_ioctl(bond_dev, ifr, SIOCBONDENSLAVE); 4511 case BOND_RELEASE_OLD: 4512 return bond_do_ioctl(bond_dev, ifr, SIOCBONDRELEASE); 4513 case BOND_SETHWADDR_OLD: 4514 return bond_do_ioctl(bond_dev, ifr, SIOCBONDSETHWADDR); 4515 case BOND_CHANGE_ACTIVE_OLD: 4516 return bond_do_ioctl(bond_dev, ifr, SIOCBONDCHANGEACTIVE); 4517 } 4518 4519 return -EOPNOTSUPP; 4520 } 4521 4522 static void bond_change_rx_flags(struct net_device *bond_dev, int change) 4523 { 4524 struct bonding *bond = netdev_priv(bond_dev); 4525 4526 if (change & IFF_PROMISC) 4527 bond_set_promiscuity(bond, 4528 bond_dev->flags & IFF_PROMISC ? 1 : -1); 4529 4530 if (change & IFF_ALLMULTI) 4531 bond_set_allmulti(bond, 4532 bond_dev->flags & IFF_ALLMULTI ? 1 : -1); 4533 } 4534 4535 static void bond_set_rx_mode(struct net_device *bond_dev) 4536 { 4537 struct bonding *bond = netdev_priv(bond_dev); 4538 struct list_head *iter; 4539 struct slave *slave; 4540 4541 rcu_read_lock(); 4542 if (bond_uses_primary(bond)) { 4543 slave = rcu_dereference(bond->curr_active_slave); 4544 if (slave) { 4545 dev_uc_sync(slave->dev, bond_dev); 4546 dev_mc_sync(slave->dev, bond_dev); 4547 } 4548 } else { 4549 bond_for_each_slave_rcu(bond, slave, iter) { 4550 dev_uc_sync_multiple(slave->dev, bond_dev); 4551 dev_mc_sync_multiple(slave->dev, bond_dev); 4552 } 4553 } 4554 rcu_read_unlock(); 4555 } 4556 4557 static int bond_neigh_init(struct neighbour *n) 4558 { 4559 struct bonding *bond = netdev_priv(n->dev); 4560 const struct net_device_ops *slave_ops; 4561 struct neigh_parms parms; 4562 struct slave *slave; 4563 int ret = 0; 4564 4565 rcu_read_lock(); 4566 slave = bond_first_slave_rcu(bond); 4567 if (!slave) 4568 goto out; 4569 slave_ops = slave->dev->netdev_ops; 4570 if (!slave_ops->ndo_neigh_setup) 4571 goto out; 4572 4573 /* TODO: find another way [1] to implement this. 4574 * Passing a zeroed structure is fragile, 4575 * but at least we do not pass garbage. 4576 * 4577 * [1] One way would be that ndo_neigh_setup() never touch 4578 * struct neigh_parms, but propagate the new neigh_setup() 4579 * back to ___neigh_create() / neigh_parms_alloc() 4580 */ 4581 memset(&parms, 0, sizeof(parms)); 4582 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); 4583 4584 if (ret) 4585 goto out; 4586 4587 if (parms.neigh_setup) 4588 ret = parms.neigh_setup(n); 4589 out: 4590 rcu_read_unlock(); 4591 return ret; 4592 } 4593 4594 /* The bonding ndo_neigh_setup is called at init time beofre any 4595 * slave exists. So we must declare proxy setup function which will 4596 * be used at run time to resolve the actual slave neigh param setup. 4597 * 4598 * It's also called by master devices (such as vlans) to setup their 4599 * underlying devices. In that case - do nothing, we're already set up from 4600 * our init. 4601 */ 4602 static int bond_neigh_setup(struct net_device *dev, 4603 struct neigh_parms *parms) 4604 { 4605 /* modify only our neigh_parms */ 4606 if (parms->dev == dev) 4607 parms->neigh_setup = bond_neigh_init; 4608 4609 return 0; 4610 } 4611 4612 /* Change the MTU of all of a master's slaves to match the master */ 4613 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 4614 { 4615 struct bonding *bond = netdev_priv(bond_dev); 4616 struct slave *slave, *rollback_slave; 4617 struct list_head *iter; 4618 int res = 0; 4619 4620 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu); 4621 4622 bond_for_each_slave(bond, slave, iter) { 4623 slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n", 4624 slave, slave->dev->netdev_ops->ndo_change_mtu); 4625 4626 res = dev_set_mtu(slave->dev, new_mtu); 4627 4628 if (res) { 4629 /* If we failed to set the slave's mtu to the new value 4630 * we must abort the operation even in ACTIVE_BACKUP 4631 * mode, because if we allow the backup slaves to have 4632 * different mtu values than the active slave we'll 4633 * need to change their mtu when doing a failover. That 4634 * means changing their mtu from timer context, which 4635 * is probably not a good idea. 4636 */ 4637 slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n", 4638 res, new_mtu); 4639 goto unwind; 4640 } 4641 } 4642 4643 bond_dev->mtu = new_mtu; 4644 4645 return 0; 4646 4647 unwind: 4648 /* unwind from head to the slave that failed */ 4649 bond_for_each_slave(bond, rollback_slave, iter) { 4650 int tmp_res; 4651 4652 if (rollback_slave == slave) 4653 break; 4654 4655 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu); 4656 if (tmp_res) 4657 slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n", 4658 tmp_res); 4659 } 4660 4661 return res; 4662 } 4663 4664 /* Change HW address 4665 * 4666 * Note that many devices must be down to change the HW address, and 4667 * downing the master releases all slaves. We can make bonds full of 4668 * bonding devices to test this, however. 4669 */ 4670 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 4671 { 4672 struct bonding *bond = netdev_priv(bond_dev); 4673 struct slave *slave, *rollback_slave; 4674 struct sockaddr_storage *ss = addr, tmp_ss; 4675 struct list_head *iter; 4676 int res = 0; 4677 4678 if (BOND_MODE(bond) == BOND_MODE_ALB) 4679 return bond_alb_set_mac_address(bond_dev, addr); 4680 4681 4682 netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond); 4683 4684 /* If fail_over_mac is enabled, do nothing and return success. 4685 * Returning an error causes ifenslave to fail. 4686 */ 4687 if (bond->params.fail_over_mac && 4688 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 4689 return 0; 4690 4691 if (!is_valid_ether_addr(ss->__data)) 4692 return -EADDRNOTAVAIL; 4693 4694 bond_for_each_slave(bond, slave, iter) { 4695 slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n", 4696 __func__, slave); 4697 res = dev_set_mac_address(slave->dev, addr, NULL); 4698 if (res) { 4699 /* TODO: consider downing the slave 4700 * and retry ? 4701 * User should expect communications 4702 * breakage anyway until ARP finish 4703 * updating, so... 4704 */ 4705 slave_dbg(bond_dev, slave->dev, "%s: err %d\n", 4706 __func__, res); 4707 goto unwind; 4708 } 4709 } 4710 4711 /* success */ 4712 dev_addr_set(bond_dev, ss->__data); 4713 return 0; 4714 4715 unwind: 4716 memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 4717 tmp_ss.ss_family = bond_dev->type; 4718 4719 /* unwind from head to the slave that failed */ 4720 bond_for_each_slave(bond, rollback_slave, iter) { 4721 int tmp_res; 4722 4723 if (rollback_slave == slave) 4724 break; 4725 4726 tmp_res = dev_set_mac_address(rollback_slave->dev, 4727 (struct sockaddr *)&tmp_ss, NULL); 4728 if (tmp_res) { 4729 slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n", 4730 __func__, tmp_res); 4731 } 4732 } 4733 4734 return res; 4735 } 4736 4737 /** 4738 * bond_get_slave_by_id - get xmit slave with slave_id 4739 * @bond: bonding device that is transmitting 4740 * @slave_id: slave id up to slave_cnt-1 through which to transmit 4741 * 4742 * This function tries to get slave with slave_id but in case 4743 * it fails, it tries to find the first available slave for transmission. 4744 */ 4745 static struct slave *bond_get_slave_by_id(struct bonding *bond, 4746 int slave_id) 4747 { 4748 struct list_head *iter; 4749 struct slave *slave; 4750 int i = slave_id; 4751 4752 /* Here we start from the slave with slave_id */ 4753 bond_for_each_slave_rcu(bond, slave, iter) { 4754 if (--i < 0) { 4755 if (bond_slave_can_tx(slave)) 4756 return slave; 4757 } 4758 } 4759 4760 /* Here we start from the first slave up to slave_id */ 4761 i = slave_id; 4762 bond_for_each_slave_rcu(bond, slave, iter) { 4763 if (--i < 0) 4764 break; 4765 if (bond_slave_can_tx(slave)) 4766 return slave; 4767 } 4768 /* no slave that can tx has been found */ 4769 return NULL; 4770 } 4771 4772 /** 4773 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave 4774 * @bond: bonding device to use 4775 * 4776 * Based on the value of the bonding device's packets_per_slave parameter 4777 * this function generates a slave id, which is usually used as the next 4778 * slave to transmit through. 4779 */ 4780 static u32 bond_rr_gen_slave_id(struct bonding *bond) 4781 { 4782 u32 slave_id; 4783 struct reciprocal_value reciprocal_packets_per_slave; 4784 int packets_per_slave = bond->params.packets_per_slave; 4785 4786 switch (packets_per_slave) { 4787 case 0: 4788 slave_id = prandom_u32(); 4789 break; 4790 case 1: 4791 slave_id = this_cpu_inc_return(*bond->rr_tx_counter); 4792 break; 4793 default: 4794 reciprocal_packets_per_slave = 4795 bond->params.reciprocal_packets_per_slave; 4796 slave_id = this_cpu_inc_return(*bond->rr_tx_counter); 4797 slave_id = reciprocal_divide(slave_id, 4798 reciprocal_packets_per_slave); 4799 break; 4800 } 4801 4802 return slave_id; 4803 } 4804 4805 static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond, 4806 struct sk_buff *skb) 4807 { 4808 struct slave *slave; 4809 int slave_cnt; 4810 u32 slave_id; 4811 4812 /* Start with the curr_active_slave that joined the bond as the 4813 * default for sending IGMP traffic. For failover purposes one 4814 * needs to maintain some consistency for the interface that will 4815 * send the join/membership reports. The curr_active_slave found 4816 * will send all of this type of traffic. 4817 */ 4818 if (skb->protocol == htons(ETH_P_IP)) { 4819 int noff = skb_network_offset(skb); 4820 struct iphdr *iph; 4821 4822 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph)))) 4823 goto non_igmp; 4824 4825 iph = ip_hdr(skb); 4826 if (iph->protocol == IPPROTO_IGMP) { 4827 slave = rcu_dereference(bond->curr_active_slave); 4828 if (slave) 4829 return slave; 4830 return bond_get_slave_by_id(bond, 0); 4831 } 4832 } 4833 4834 non_igmp: 4835 slave_cnt = READ_ONCE(bond->slave_cnt); 4836 if (likely(slave_cnt)) { 4837 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt; 4838 return bond_get_slave_by_id(bond, slave_id); 4839 } 4840 return NULL; 4841 } 4842 4843 static struct slave *bond_xdp_xmit_roundrobin_slave_get(struct bonding *bond, 4844 struct xdp_buff *xdp) 4845 { 4846 struct slave *slave; 4847 int slave_cnt; 4848 u32 slave_id; 4849 const struct ethhdr *eth; 4850 void *data = xdp->data; 4851 4852 if (data + sizeof(struct ethhdr) > xdp->data_end) 4853 goto non_igmp; 4854 4855 eth = (struct ethhdr *)data; 4856 data += sizeof(struct ethhdr); 4857 4858 /* See comment on IGMP in bond_xmit_roundrobin_slave_get() */ 4859 if (eth->h_proto == htons(ETH_P_IP)) { 4860 const struct iphdr *iph; 4861 4862 if (data + sizeof(struct iphdr) > xdp->data_end) 4863 goto non_igmp; 4864 4865 iph = (struct iphdr *)data; 4866 4867 if (iph->protocol == IPPROTO_IGMP) { 4868 slave = rcu_dereference(bond->curr_active_slave); 4869 if (slave) 4870 return slave; 4871 return bond_get_slave_by_id(bond, 0); 4872 } 4873 } 4874 4875 non_igmp: 4876 slave_cnt = READ_ONCE(bond->slave_cnt); 4877 if (likely(slave_cnt)) { 4878 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt; 4879 return bond_get_slave_by_id(bond, slave_id); 4880 } 4881 return NULL; 4882 } 4883 4884 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb, 4885 struct net_device *bond_dev) 4886 { 4887 struct bonding *bond = netdev_priv(bond_dev); 4888 struct slave *slave; 4889 4890 slave = bond_xmit_roundrobin_slave_get(bond, skb); 4891 if (likely(slave)) 4892 return bond_dev_queue_xmit(bond, skb, slave->dev); 4893 4894 return bond_tx_drop(bond_dev, skb); 4895 } 4896 4897 static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond) 4898 { 4899 return rcu_dereference(bond->curr_active_slave); 4900 } 4901 4902 /* In active-backup mode, we know that bond->curr_active_slave is always valid if 4903 * the bond has a usable interface. 4904 */ 4905 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb, 4906 struct net_device *bond_dev) 4907 { 4908 struct bonding *bond = netdev_priv(bond_dev); 4909 struct slave *slave; 4910 4911 slave = bond_xmit_activebackup_slave_get(bond); 4912 if (slave) 4913 return bond_dev_queue_xmit(bond, skb, slave->dev); 4914 4915 return bond_tx_drop(bond_dev, skb); 4916 } 4917 4918 /* Use this to update slave_array when (a) it's not appropriate to update 4919 * slave_array right away (note that update_slave_array() may sleep) 4920 * and / or (b) RTNL is not held. 4921 */ 4922 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay) 4923 { 4924 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay); 4925 } 4926 4927 /* Slave array work handler. Holds only RTNL */ 4928 static void bond_slave_arr_handler(struct work_struct *work) 4929 { 4930 struct bonding *bond = container_of(work, struct bonding, 4931 slave_arr_work.work); 4932 int ret; 4933 4934 if (!rtnl_trylock()) 4935 goto err; 4936 4937 ret = bond_update_slave_arr(bond, NULL); 4938 rtnl_unlock(); 4939 if (ret) { 4940 pr_warn_ratelimited("Failed to update slave array from WT\n"); 4941 goto err; 4942 } 4943 return; 4944 4945 err: 4946 bond_slave_arr_work_rearm(bond, 1); 4947 } 4948 4949 static void bond_skip_slave(struct bond_up_slave *slaves, 4950 struct slave *skipslave) 4951 { 4952 int idx; 4953 4954 /* Rare situation where caller has asked to skip a specific 4955 * slave but allocation failed (most likely!). BTW this is 4956 * only possible when the call is initiated from 4957 * __bond_release_one(). In this situation; overwrite the 4958 * skipslave entry in the array with the last entry from the 4959 * array to avoid a situation where the xmit path may choose 4960 * this to-be-skipped slave to send a packet out. 4961 */ 4962 for (idx = 0; slaves && idx < slaves->count; idx++) { 4963 if (skipslave == slaves->arr[idx]) { 4964 slaves->arr[idx] = 4965 slaves->arr[slaves->count - 1]; 4966 slaves->count--; 4967 break; 4968 } 4969 } 4970 } 4971 4972 static void bond_set_slave_arr(struct bonding *bond, 4973 struct bond_up_slave *usable_slaves, 4974 struct bond_up_slave *all_slaves) 4975 { 4976 struct bond_up_slave *usable, *all; 4977 4978 usable = rtnl_dereference(bond->usable_slaves); 4979 rcu_assign_pointer(bond->usable_slaves, usable_slaves); 4980 kfree_rcu(usable, rcu); 4981 4982 all = rtnl_dereference(bond->all_slaves); 4983 rcu_assign_pointer(bond->all_slaves, all_slaves); 4984 kfree_rcu(all, rcu); 4985 } 4986 4987 static void bond_reset_slave_arr(struct bonding *bond) 4988 { 4989 struct bond_up_slave *usable, *all; 4990 4991 usable = rtnl_dereference(bond->usable_slaves); 4992 if (usable) { 4993 RCU_INIT_POINTER(bond->usable_slaves, NULL); 4994 kfree_rcu(usable, rcu); 4995 } 4996 4997 all = rtnl_dereference(bond->all_slaves); 4998 if (all) { 4999 RCU_INIT_POINTER(bond->all_slaves, NULL); 5000 kfree_rcu(all, rcu); 5001 } 5002 } 5003 5004 /* Build the usable slaves array in control path for modes that use xmit-hash 5005 * to determine the slave interface - 5006 * (a) BOND_MODE_8023AD 5007 * (b) BOND_MODE_XOR 5008 * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0 5009 * 5010 * The caller is expected to hold RTNL only and NO other lock! 5011 */ 5012 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave) 5013 { 5014 struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL; 5015 struct slave *slave; 5016 struct list_head *iter; 5017 int agg_id = 0; 5018 int ret = 0; 5019 5020 might_sleep(); 5021 5022 usable_slaves = kzalloc(struct_size(usable_slaves, arr, 5023 bond->slave_cnt), GFP_KERNEL); 5024 all_slaves = kzalloc(struct_size(all_slaves, arr, 5025 bond->slave_cnt), GFP_KERNEL); 5026 if (!usable_slaves || !all_slaves) { 5027 ret = -ENOMEM; 5028 goto out; 5029 } 5030 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 5031 struct ad_info ad_info; 5032 5033 spin_lock_bh(&bond->mode_lock); 5034 if (bond_3ad_get_active_agg_info(bond, &ad_info)) { 5035 spin_unlock_bh(&bond->mode_lock); 5036 pr_debug("bond_3ad_get_active_agg_info failed\n"); 5037 /* No active aggragator means it's not safe to use 5038 * the previous array. 5039 */ 5040 bond_reset_slave_arr(bond); 5041 goto out; 5042 } 5043 spin_unlock_bh(&bond->mode_lock); 5044 agg_id = ad_info.aggregator_id; 5045 } 5046 bond_for_each_slave(bond, slave, iter) { 5047 if (skipslave == slave) 5048 continue; 5049 5050 all_slaves->arr[all_slaves->count++] = slave; 5051 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 5052 struct aggregator *agg; 5053 5054 agg = SLAVE_AD_INFO(slave)->port.aggregator; 5055 if (!agg || agg->aggregator_identifier != agg_id) 5056 continue; 5057 } 5058 if (!bond_slave_can_tx(slave)) 5059 continue; 5060 5061 slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n", 5062 usable_slaves->count); 5063 5064 usable_slaves->arr[usable_slaves->count++] = slave; 5065 } 5066 5067 bond_set_slave_arr(bond, usable_slaves, all_slaves); 5068 return ret; 5069 out: 5070 if (ret != 0 && skipslave) { 5071 bond_skip_slave(rtnl_dereference(bond->all_slaves), 5072 skipslave); 5073 bond_skip_slave(rtnl_dereference(bond->usable_slaves), 5074 skipslave); 5075 } 5076 kfree_rcu(all_slaves, rcu); 5077 kfree_rcu(usable_slaves, rcu); 5078 5079 return ret; 5080 } 5081 5082 static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond, 5083 struct sk_buff *skb, 5084 struct bond_up_slave *slaves) 5085 { 5086 struct slave *slave; 5087 unsigned int count; 5088 u32 hash; 5089 5090 hash = bond_xmit_hash(bond, skb); 5091 count = slaves ? READ_ONCE(slaves->count) : 0; 5092 if (unlikely(!count)) 5093 return NULL; 5094 5095 slave = slaves->arr[hash % count]; 5096 return slave; 5097 } 5098 5099 static struct slave *bond_xdp_xmit_3ad_xor_slave_get(struct bonding *bond, 5100 struct xdp_buff *xdp) 5101 { 5102 struct bond_up_slave *slaves; 5103 unsigned int count; 5104 u32 hash; 5105 5106 hash = bond_xmit_hash_xdp(bond, xdp); 5107 slaves = rcu_dereference(bond->usable_slaves); 5108 count = slaves ? READ_ONCE(slaves->count) : 0; 5109 if (unlikely(!count)) 5110 return NULL; 5111 5112 return slaves->arr[hash % count]; 5113 } 5114 5115 /* Use this Xmit function for 3AD as well as XOR modes. The current 5116 * usable slave array is formed in the control path. The xmit function 5117 * just calculates hash and sends the packet out. 5118 */ 5119 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb, 5120 struct net_device *dev) 5121 { 5122 struct bonding *bond = netdev_priv(dev); 5123 struct bond_up_slave *slaves; 5124 struct slave *slave; 5125 5126 slaves = rcu_dereference(bond->usable_slaves); 5127 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves); 5128 if (likely(slave)) 5129 return bond_dev_queue_xmit(bond, skb, slave->dev); 5130 5131 return bond_tx_drop(dev, skb); 5132 } 5133 5134 /* in broadcast mode, we send everything to all usable interfaces. */ 5135 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb, 5136 struct net_device *bond_dev) 5137 { 5138 struct bonding *bond = netdev_priv(bond_dev); 5139 struct slave *slave = NULL; 5140 struct list_head *iter; 5141 bool xmit_suc = false; 5142 bool skb_used = false; 5143 5144 bond_for_each_slave_rcu(bond, slave, iter) { 5145 struct sk_buff *skb2; 5146 5147 if (!(bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)) 5148 continue; 5149 5150 if (bond_is_last_slave(bond, slave)) { 5151 skb2 = skb; 5152 skb_used = true; 5153 } else { 5154 skb2 = skb_clone(skb, GFP_ATOMIC); 5155 if (!skb2) { 5156 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n", 5157 bond_dev->name, __func__); 5158 continue; 5159 } 5160 } 5161 5162 if (bond_dev_queue_xmit(bond, skb2, slave->dev) == NETDEV_TX_OK) 5163 xmit_suc = true; 5164 } 5165 5166 if (!skb_used) 5167 dev_kfree_skb_any(skb); 5168 5169 if (xmit_suc) 5170 return NETDEV_TX_OK; 5171 5172 dev_core_stats_tx_dropped_inc(bond_dev); 5173 return NET_XMIT_DROP; 5174 } 5175 5176 /*------------------------- Device initialization ---------------------------*/ 5177 5178 /* Lookup the slave that corresponds to a qid */ 5179 static inline int bond_slave_override(struct bonding *bond, 5180 struct sk_buff *skb) 5181 { 5182 struct slave *slave = NULL; 5183 struct list_head *iter; 5184 5185 if (!skb_rx_queue_recorded(skb)) 5186 return 1; 5187 5188 /* Find out if any slaves have the same mapping as this skb. */ 5189 bond_for_each_slave_rcu(bond, slave, iter) { 5190 if (slave->queue_id == skb_get_queue_mapping(skb)) { 5191 if (bond_slave_is_up(slave) && 5192 slave->link == BOND_LINK_UP) { 5193 bond_dev_queue_xmit(bond, skb, slave->dev); 5194 return 0; 5195 } 5196 /* If the slave isn't UP, use default transmit policy. */ 5197 break; 5198 } 5199 } 5200 5201 return 1; 5202 } 5203 5204 5205 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb, 5206 struct net_device *sb_dev) 5207 { 5208 /* This helper function exists to help dev_pick_tx get the correct 5209 * destination queue. Using a helper function skips a call to 5210 * skb_tx_hash and will put the skbs in the queue we expect on their 5211 * way down to the bonding driver. 5212 */ 5213 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 5214 5215 /* Save the original txq to restore before passing to the driver */ 5216 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb); 5217 5218 if (unlikely(txq >= dev->real_num_tx_queues)) { 5219 do { 5220 txq -= dev->real_num_tx_queues; 5221 } while (txq >= dev->real_num_tx_queues); 5222 } 5223 return txq; 5224 } 5225 5226 static struct net_device *bond_xmit_get_slave(struct net_device *master_dev, 5227 struct sk_buff *skb, 5228 bool all_slaves) 5229 { 5230 struct bonding *bond = netdev_priv(master_dev); 5231 struct bond_up_slave *slaves; 5232 struct slave *slave = NULL; 5233 5234 switch (BOND_MODE(bond)) { 5235 case BOND_MODE_ROUNDROBIN: 5236 slave = bond_xmit_roundrobin_slave_get(bond, skb); 5237 break; 5238 case BOND_MODE_ACTIVEBACKUP: 5239 slave = bond_xmit_activebackup_slave_get(bond); 5240 break; 5241 case BOND_MODE_8023AD: 5242 case BOND_MODE_XOR: 5243 if (all_slaves) 5244 slaves = rcu_dereference(bond->all_slaves); 5245 else 5246 slaves = rcu_dereference(bond->usable_slaves); 5247 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves); 5248 break; 5249 case BOND_MODE_BROADCAST: 5250 break; 5251 case BOND_MODE_ALB: 5252 slave = bond_xmit_alb_slave_get(bond, skb); 5253 break; 5254 case BOND_MODE_TLB: 5255 slave = bond_xmit_tlb_slave_get(bond, skb); 5256 break; 5257 default: 5258 /* Should never happen, mode already checked */ 5259 WARN_ONCE(true, "Unknown bonding mode"); 5260 break; 5261 } 5262 5263 if (slave) 5264 return slave->dev; 5265 return NULL; 5266 } 5267 5268 static void bond_sk_to_flow(struct sock *sk, struct flow_keys *flow) 5269 { 5270 switch (sk->sk_family) { 5271 #if IS_ENABLED(CONFIG_IPV6) 5272 case AF_INET6: 5273 if (ipv6_only_sock(sk) || 5274 ipv6_addr_type(&sk->sk_v6_daddr) != IPV6_ADDR_MAPPED) { 5275 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; 5276 flow->addrs.v6addrs.src = inet6_sk(sk)->saddr; 5277 flow->addrs.v6addrs.dst = sk->sk_v6_daddr; 5278 break; 5279 } 5280 fallthrough; 5281 #endif 5282 default: /* AF_INET */ 5283 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; 5284 flow->addrs.v4addrs.src = inet_sk(sk)->inet_rcv_saddr; 5285 flow->addrs.v4addrs.dst = inet_sk(sk)->inet_daddr; 5286 break; 5287 } 5288 5289 flow->ports.src = inet_sk(sk)->inet_sport; 5290 flow->ports.dst = inet_sk(sk)->inet_dport; 5291 } 5292 5293 /** 5294 * bond_sk_hash_l34 - generate a hash value based on the socket's L3 and L4 fields 5295 * @sk: socket to use for headers 5296 * 5297 * This function will extract the necessary field from the socket and use 5298 * them to generate a hash based on the LAYER34 xmit_policy. 5299 * Assumes that sk is a TCP or UDP socket. 5300 */ 5301 static u32 bond_sk_hash_l34(struct sock *sk) 5302 { 5303 struct flow_keys flow; 5304 u32 hash; 5305 5306 bond_sk_to_flow(sk, &flow); 5307 5308 /* L4 */ 5309 memcpy(&hash, &flow.ports.ports, sizeof(hash)); 5310 /* L3 */ 5311 return bond_ip_hash(hash, &flow, BOND_XMIT_POLICY_LAYER34); 5312 } 5313 5314 static struct net_device *__bond_sk_get_lower_dev(struct bonding *bond, 5315 struct sock *sk) 5316 { 5317 struct bond_up_slave *slaves; 5318 struct slave *slave; 5319 unsigned int count; 5320 u32 hash; 5321 5322 slaves = rcu_dereference(bond->usable_slaves); 5323 count = slaves ? READ_ONCE(slaves->count) : 0; 5324 if (unlikely(!count)) 5325 return NULL; 5326 5327 hash = bond_sk_hash_l34(sk); 5328 slave = slaves->arr[hash % count]; 5329 5330 return slave->dev; 5331 } 5332 5333 static struct net_device *bond_sk_get_lower_dev(struct net_device *dev, 5334 struct sock *sk) 5335 { 5336 struct bonding *bond = netdev_priv(dev); 5337 struct net_device *lower = NULL; 5338 5339 rcu_read_lock(); 5340 if (bond_sk_check(bond)) 5341 lower = __bond_sk_get_lower_dev(bond, sk); 5342 rcu_read_unlock(); 5343 5344 return lower; 5345 } 5346 5347 #if IS_ENABLED(CONFIG_TLS_DEVICE) 5348 static netdev_tx_t bond_tls_device_xmit(struct bonding *bond, struct sk_buff *skb, 5349 struct net_device *dev) 5350 { 5351 struct net_device *tls_netdev = rcu_dereference(tls_get_ctx(skb->sk)->netdev); 5352 5353 /* tls_netdev might become NULL, even if tls_is_sk_tx_device_offloaded 5354 * was true, if tls_device_down is running in parallel, but it's OK, 5355 * because bond_get_slave_by_dev has a NULL check. 5356 */ 5357 if (likely(bond_get_slave_by_dev(bond, tls_netdev))) 5358 return bond_dev_queue_xmit(bond, skb, tls_netdev); 5359 return bond_tx_drop(dev, skb); 5360 } 5361 #endif 5362 5363 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 5364 { 5365 struct bonding *bond = netdev_priv(dev); 5366 5367 if (bond_should_override_tx_queue(bond) && 5368 !bond_slave_override(bond, skb)) 5369 return NETDEV_TX_OK; 5370 5371 #if IS_ENABLED(CONFIG_TLS_DEVICE) 5372 if (skb->sk && tls_is_sk_tx_device_offloaded(skb->sk)) 5373 return bond_tls_device_xmit(bond, skb, dev); 5374 #endif 5375 5376 switch (BOND_MODE(bond)) { 5377 case BOND_MODE_ROUNDROBIN: 5378 return bond_xmit_roundrobin(skb, dev); 5379 case BOND_MODE_ACTIVEBACKUP: 5380 return bond_xmit_activebackup(skb, dev); 5381 case BOND_MODE_8023AD: 5382 case BOND_MODE_XOR: 5383 return bond_3ad_xor_xmit(skb, dev); 5384 case BOND_MODE_BROADCAST: 5385 return bond_xmit_broadcast(skb, dev); 5386 case BOND_MODE_ALB: 5387 return bond_alb_xmit(skb, dev); 5388 case BOND_MODE_TLB: 5389 return bond_tlb_xmit(skb, dev); 5390 default: 5391 /* Should never happen, mode already checked */ 5392 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond)); 5393 WARN_ON_ONCE(1); 5394 return bond_tx_drop(dev, skb); 5395 } 5396 } 5397 5398 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 5399 { 5400 struct bonding *bond = netdev_priv(dev); 5401 netdev_tx_t ret = NETDEV_TX_OK; 5402 5403 /* If we risk deadlock from transmitting this in the 5404 * netpoll path, tell netpoll to queue the frame for later tx 5405 */ 5406 if (unlikely(is_netpoll_tx_blocked(dev))) 5407 return NETDEV_TX_BUSY; 5408 5409 rcu_read_lock(); 5410 if (bond_has_slaves(bond)) 5411 ret = __bond_start_xmit(skb, dev); 5412 else 5413 ret = bond_tx_drop(dev, skb); 5414 rcu_read_unlock(); 5415 5416 return ret; 5417 } 5418 5419 static struct net_device * 5420 bond_xdp_get_xmit_slave(struct net_device *bond_dev, struct xdp_buff *xdp) 5421 { 5422 struct bonding *bond = netdev_priv(bond_dev); 5423 struct slave *slave; 5424 5425 /* Caller needs to hold rcu_read_lock() */ 5426 5427 switch (BOND_MODE(bond)) { 5428 case BOND_MODE_ROUNDROBIN: 5429 slave = bond_xdp_xmit_roundrobin_slave_get(bond, xdp); 5430 break; 5431 5432 case BOND_MODE_ACTIVEBACKUP: 5433 slave = bond_xmit_activebackup_slave_get(bond); 5434 break; 5435 5436 case BOND_MODE_8023AD: 5437 case BOND_MODE_XOR: 5438 slave = bond_xdp_xmit_3ad_xor_slave_get(bond, xdp); 5439 break; 5440 5441 default: 5442 /* Should never happen. Mode guarded by bond_xdp_check() */ 5443 netdev_err(bond_dev, "Unknown bonding mode %d for xdp xmit\n", BOND_MODE(bond)); 5444 WARN_ON_ONCE(1); 5445 return NULL; 5446 } 5447 5448 if (slave) 5449 return slave->dev; 5450 5451 return NULL; 5452 } 5453 5454 static int bond_xdp_xmit(struct net_device *bond_dev, 5455 int n, struct xdp_frame **frames, u32 flags) 5456 { 5457 int nxmit, err = -ENXIO; 5458 5459 rcu_read_lock(); 5460 5461 for (nxmit = 0; nxmit < n; nxmit++) { 5462 struct xdp_frame *frame = frames[nxmit]; 5463 struct xdp_frame *frames1[] = {frame}; 5464 struct net_device *slave_dev; 5465 struct xdp_buff xdp; 5466 5467 xdp_convert_frame_to_buff(frame, &xdp); 5468 5469 slave_dev = bond_xdp_get_xmit_slave(bond_dev, &xdp); 5470 if (!slave_dev) { 5471 err = -ENXIO; 5472 break; 5473 } 5474 5475 err = slave_dev->netdev_ops->ndo_xdp_xmit(slave_dev, 1, frames1, flags); 5476 if (err < 1) 5477 break; 5478 } 5479 5480 rcu_read_unlock(); 5481 5482 /* If error happened on the first frame then we can pass the error up, otherwise 5483 * report the number of frames that were xmitted. 5484 */ 5485 if (err < 0) 5486 return (nxmit == 0 ? err : nxmit); 5487 5488 return nxmit; 5489 } 5490 5491 static int bond_xdp_set(struct net_device *dev, struct bpf_prog *prog, 5492 struct netlink_ext_ack *extack) 5493 { 5494 struct bonding *bond = netdev_priv(dev); 5495 struct list_head *iter; 5496 struct slave *slave, *rollback_slave; 5497 struct bpf_prog *old_prog; 5498 struct netdev_bpf xdp = { 5499 .command = XDP_SETUP_PROG, 5500 .flags = 0, 5501 .prog = prog, 5502 .extack = extack, 5503 }; 5504 int err; 5505 5506 ASSERT_RTNL(); 5507 5508 if (!bond_xdp_check(bond)) 5509 return -EOPNOTSUPP; 5510 5511 old_prog = bond->xdp_prog; 5512 bond->xdp_prog = prog; 5513 5514 bond_for_each_slave(bond, slave, iter) { 5515 struct net_device *slave_dev = slave->dev; 5516 5517 if (!slave_dev->netdev_ops->ndo_bpf || 5518 !slave_dev->netdev_ops->ndo_xdp_xmit) { 5519 SLAVE_NL_ERR(dev, slave_dev, extack, 5520 "Slave device does not support XDP"); 5521 err = -EOPNOTSUPP; 5522 goto err; 5523 } 5524 5525 if (dev_xdp_prog_count(slave_dev) > 0) { 5526 SLAVE_NL_ERR(dev, slave_dev, extack, 5527 "Slave has XDP program loaded, please unload before enslaving"); 5528 err = -EOPNOTSUPP; 5529 goto err; 5530 } 5531 5532 err = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 5533 if (err < 0) { 5534 /* ndo_bpf() sets extack error message */ 5535 slave_err(dev, slave_dev, "Error %d calling ndo_bpf\n", err); 5536 goto err; 5537 } 5538 if (prog) 5539 bpf_prog_inc(prog); 5540 } 5541 5542 if (prog) { 5543 static_branch_inc(&bpf_master_redirect_enabled_key); 5544 } else if (old_prog) { 5545 bpf_prog_put(old_prog); 5546 static_branch_dec(&bpf_master_redirect_enabled_key); 5547 } 5548 5549 return 0; 5550 5551 err: 5552 /* unwind the program changes */ 5553 bond->xdp_prog = old_prog; 5554 xdp.prog = old_prog; 5555 xdp.extack = NULL; /* do not overwrite original error */ 5556 5557 bond_for_each_slave(bond, rollback_slave, iter) { 5558 struct net_device *slave_dev = rollback_slave->dev; 5559 int err_unwind; 5560 5561 if (slave == rollback_slave) 5562 break; 5563 5564 err_unwind = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 5565 if (err_unwind < 0) 5566 slave_err(dev, slave_dev, 5567 "Error %d when unwinding XDP program change\n", err_unwind); 5568 else if (xdp.prog) 5569 bpf_prog_inc(xdp.prog); 5570 } 5571 return err; 5572 } 5573 5574 static int bond_xdp(struct net_device *dev, struct netdev_bpf *xdp) 5575 { 5576 switch (xdp->command) { 5577 case XDP_SETUP_PROG: 5578 return bond_xdp_set(dev, xdp->prog, xdp->extack); 5579 default: 5580 return -EINVAL; 5581 } 5582 } 5583 5584 static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed) 5585 { 5586 if (speed == 0 || speed == SPEED_UNKNOWN) 5587 speed = slave->speed; 5588 else 5589 speed = min(speed, slave->speed); 5590 5591 return speed; 5592 } 5593 5594 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev, 5595 struct ethtool_link_ksettings *cmd) 5596 { 5597 struct bonding *bond = netdev_priv(bond_dev); 5598 struct list_head *iter; 5599 struct slave *slave; 5600 u32 speed = 0; 5601 5602 cmd->base.duplex = DUPLEX_UNKNOWN; 5603 cmd->base.port = PORT_OTHER; 5604 5605 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we 5606 * do not need to check mode. Though link speed might not represent 5607 * the true receive or transmit bandwidth (not all modes are symmetric) 5608 * this is an accurate maximum. 5609 */ 5610 bond_for_each_slave(bond, slave, iter) { 5611 if (bond_slave_can_tx(slave)) { 5612 if (slave->speed != SPEED_UNKNOWN) { 5613 if (BOND_MODE(bond) == BOND_MODE_BROADCAST) 5614 speed = bond_mode_bcast_speed(slave, 5615 speed); 5616 else 5617 speed += slave->speed; 5618 } 5619 if (cmd->base.duplex == DUPLEX_UNKNOWN && 5620 slave->duplex != DUPLEX_UNKNOWN) 5621 cmd->base.duplex = slave->duplex; 5622 } 5623 } 5624 cmd->base.speed = speed ? : SPEED_UNKNOWN; 5625 5626 return 0; 5627 } 5628 5629 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 5630 struct ethtool_drvinfo *drvinfo) 5631 { 5632 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver)); 5633 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d", 5634 BOND_ABI_VERSION); 5635 } 5636 5637 static int bond_ethtool_get_ts_info(struct net_device *bond_dev, 5638 struct ethtool_ts_info *info) 5639 { 5640 struct bonding *bond = netdev_priv(bond_dev); 5641 const struct ethtool_ops *ops; 5642 struct net_device *real_dev; 5643 struct phy_device *phydev; 5644 int ret = 0; 5645 5646 rcu_read_lock(); 5647 real_dev = bond_option_active_slave_get_rcu(bond); 5648 dev_hold(real_dev); 5649 rcu_read_unlock(); 5650 5651 if (real_dev) { 5652 ops = real_dev->ethtool_ops; 5653 phydev = real_dev->phydev; 5654 5655 if (phy_has_tsinfo(phydev)) { 5656 ret = phy_ts_info(phydev, info); 5657 goto out; 5658 } else if (ops->get_ts_info) { 5659 ret = ops->get_ts_info(real_dev, info); 5660 goto out; 5661 } 5662 } 5663 5664 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE | 5665 SOF_TIMESTAMPING_SOFTWARE; 5666 info->phc_index = -1; 5667 5668 out: 5669 dev_put(real_dev); 5670 return ret; 5671 } 5672 5673 static const struct ethtool_ops bond_ethtool_ops = { 5674 .get_drvinfo = bond_ethtool_get_drvinfo, 5675 .get_link = ethtool_op_get_link, 5676 .get_link_ksettings = bond_ethtool_get_link_ksettings, 5677 .get_ts_info = bond_ethtool_get_ts_info, 5678 }; 5679 5680 static const struct net_device_ops bond_netdev_ops = { 5681 .ndo_init = bond_init, 5682 .ndo_uninit = bond_uninit, 5683 .ndo_open = bond_open, 5684 .ndo_stop = bond_close, 5685 .ndo_start_xmit = bond_start_xmit, 5686 .ndo_select_queue = bond_select_queue, 5687 .ndo_get_stats64 = bond_get_stats, 5688 .ndo_eth_ioctl = bond_eth_ioctl, 5689 .ndo_siocbond = bond_do_ioctl, 5690 .ndo_siocdevprivate = bond_siocdevprivate, 5691 .ndo_change_rx_flags = bond_change_rx_flags, 5692 .ndo_set_rx_mode = bond_set_rx_mode, 5693 .ndo_change_mtu = bond_change_mtu, 5694 .ndo_set_mac_address = bond_set_mac_address, 5695 .ndo_neigh_setup = bond_neigh_setup, 5696 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 5697 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 5698 #ifdef CONFIG_NET_POLL_CONTROLLER 5699 .ndo_netpoll_setup = bond_netpoll_setup, 5700 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 5701 .ndo_poll_controller = bond_poll_controller, 5702 #endif 5703 .ndo_add_slave = bond_enslave, 5704 .ndo_del_slave = bond_release, 5705 .ndo_fix_features = bond_fix_features, 5706 .ndo_features_check = passthru_features_check, 5707 .ndo_get_xmit_slave = bond_xmit_get_slave, 5708 .ndo_sk_get_lower_dev = bond_sk_get_lower_dev, 5709 .ndo_bpf = bond_xdp, 5710 .ndo_xdp_xmit = bond_xdp_xmit, 5711 .ndo_xdp_get_xmit_slave = bond_xdp_get_xmit_slave, 5712 }; 5713 5714 static const struct device_type bond_type = { 5715 .name = "bond", 5716 }; 5717 5718 static void bond_destructor(struct net_device *bond_dev) 5719 { 5720 struct bonding *bond = netdev_priv(bond_dev); 5721 5722 if (bond->wq) 5723 destroy_workqueue(bond->wq); 5724 5725 if (bond->rr_tx_counter) 5726 free_percpu(bond->rr_tx_counter); 5727 } 5728 5729 void bond_setup(struct net_device *bond_dev) 5730 { 5731 struct bonding *bond = netdev_priv(bond_dev); 5732 5733 spin_lock_init(&bond->mode_lock); 5734 bond->params = bonding_defaults; 5735 5736 /* Initialize pointers */ 5737 bond->dev = bond_dev; 5738 5739 /* Initialize the device entry points */ 5740 ether_setup(bond_dev); 5741 bond_dev->max_mtu = ETH_MAX_MTU; 5742 bond_dev->netdev_ops = &bond_netdev_ops; 5743 bond_dev->ethtool_ops = &bond_ethtool_ops; 5744 5745 bond_dev->needs_free_netdev = true; 5746 bond_dev->priv_destructor = bond_destructor; 5747 5748 SET_NETDEV_DEVTYPE(bond_dev, &bond_type); 5749 5750 /* Initialize the device options */ 5751 bond_dev->flags |= IFF_MASTER; 5752 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE; 5753 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 5754 5755 #ifdef CONFIG_XFRM_OFFLOAD 5756 /* set up xfrm device ops (only supported in active-backup right now) */ 5757 bond_dev->xfrmdev_ops = &bond_xfrmdev_ops; 5758 INIT_LIST_HEAD(&bond->ipsec_list); 5759 spin_lock_init(&bond->ipsec_lock); 5760 #endif /* CONFIG_XFRM_OFFLOAD */ 5761 5762 /* don't acquire bond device's netif_tx_lock when transmitting */ 5763 bond_dev->features |= NETIF_F_LLTX; 5764 5765 /* By default, we declare the bond to be fully 5766 * VLAN hardware accelerated capable. Special 5767 * care is taken in the various xmit functions 5768 * when there are slaves that are not hw accel 5769 * capable 5770 */ 5771 5772 /* Don't allow bond devices to change network namespaces. */ 5773 bond_dev->features |= NETIF_F_NETNS_LOCAL; 5774 5775 bond_dev->hw_features = BOND_VLAN_FEATURES | 5776 NETIF_F_HW_VLAN_CTAG_RX | 5777 NETIF_F_HW_VLAN_CTAG_FILTER; 5778 5779 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL; 5780 bond_dev->features |= bond_dev->hw_features; 5781 bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; 5782 #ifdef CONFIG_XFRM_OFFLOAD 5783 bond_dev->hw_features |= BOND_XFRM_FEATURES; 5784 /* Only enable XFRM features if this is an active-backup config */ 5785 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 5786 bond_dev->features |= BOND_XFRM_FEATURES; 5787 #endif /* CONFIG_XFRM_OFFLOAD */ 5788 #if IS_ENABLED(CONFIG_TLS_DEVICE) 5789 if (bond_sk_check(bond)) 5790 bond_dev->features |= BOND_TLS_FEATURES; 5791 #endif 5792 } 5793 5794 /* Destroy a bonding device. 5795 * Must be under rtnl_lock when this function is called. 5796 */ 5797 static void bond_uninit(struct net_device *bond_dev) 5798 { 5799 struct bonding *bond = netdev_priv(bond_dev); 5800 struct bond_up_slave *usable, *all; 5801 struct list_head *iter; 5802 struct slave *slave; 5803 5804 bond_netpoll_cleanup(bond_dev); 5805 5806 /* Release the bonded slaves */ 5807 bond_for_each_slave(bond, slave, iter) 5808 __bond_release_one(bond_dev, slave->dev, true, true); 5809 netdev_info(bond_dev, "Released all slaves\n"); 5810 5811 usable = rtnl_dereference(bond->usable_slaves); 5812 if (usable) { 5813 RCU_INIT_POINTER(bond->usable_slaves, NULL); 5814 kfree_rcu(usable, rcu); 5815 } 5816 5817 all = rtnl_dereference(bond->all_slaves); 5818 if (all) { 5819 RCU_INIT_POINTER(bond->all_slaves, NULL); 5820 kfree_rcu(all, rcu); 5821 } 5822 5823 list_del(&bond->bond_list); 5824 5825 bond_debug_unregister(bond); 5826 } 5827 5828 /*------------------------- Module initialization ---------------------------*/ 5829 5830 static int bond_check_params(struct bond_params *params) 5831 { 5832 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i; 5833 struct bond_opt_value newval; 5834 const struct bond_opt_value *valptr; 5835 int arp_all_targets_value = 0; 5836 u16 ad_actor_sys_prio = 0; 5837 u16 ad_user_port_key = 0; 5838 __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 }; 5839 int arp_ip_count; 5840 int bond_mode = BOND_MODE_ROUNDROBIN; 5841 int xmit_hashtype = BOND_XMIT_POLICY_LAYER2; 5842 int lacp_fast = 0; 5843 int tlb_dynamic_lb; 5844 5845 /* Convert string parameters. */ 5846 if (mode) { 5847 bond_opt_initstr(&newval, mode); 5848 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval); 5849 if (!valptr) { 5850 pr_err("Error: Invalid bonding mode \"%s\"\n", mode); 5851 return -EINVAL; 5852 } 5853 bond_mode = valptr->value; 5854 } 5855 5856 if (xmit_hash_policy) { 5857 if (bond_mode == BOND_MODE_ROUNDROBIN || 5858 bond_mode == BOND_MODE_ACTIVEBACKUP || 5859 bond_mode == BOND_MODE_BROADCAST) { 5860 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 5861 bond_mode_name(bond_mode)); 5862 } else { 5863 bond_opt_initstr(&newval, xmit_hash_policy); 5864 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH), 5865 &newval); 5866 if (!valptr) { 5867 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 5868 xmit_hash_policy); 5869 return -EINVAL; 5870 } 5871 xmit_hashtype = valptr->value; 5872 } 5873 } 5874 5875 if (lacp_rate) { 5876 if (bond_mode != BOND_MODE_8023AD) { 5877 pr_info("lacp_rate param is irrelevant in mode %s\n", 5878 bond_mode_name(bond_mode)); 5879 } else { 5880 bond_opt_initstr(&newval, lacp_rate); 5881 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE), 5882 &newval); 5883 if (!valptr) { 5884 pr_err("Error: Invalid lacp rate \"%s\"\n", 5885 lacp_rate); 5886 return -EINVAL; 5887 } 5888 lacp_fast = valptr->value; 5889 } 5890 } 5891 5892 if (ad_select) { 5893 bond_opt_initstr(&newval, ad_select); 5894 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT), 5895 &newval); 5896 if (!valptr) { 5897 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select); 5898 return -EINVAL; 5899 } 5900 params->ad_select = valptr->value; 5901 if (bond_mode != BOND_MODE_8023AD) 5902 pr_warn("ad_select param only affects 802.3ad mode\n"); 5903 } else { 5904 params->ad_select = BOND_AD_STABLE; 5905 } 5906 5907 if (max_bonds < 0) { 5908 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 5909 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 5910 max_bonds = BOND_DEFAULT_MAX_BONDS; 5911 } 5912 5913 if (miimon < 0) { 5914 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n", 5915 miimon, INT_MAX); 5916 miimon = 0; 5917 } 5918 5919 if (updelay < 0) { 5920 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 5921 updelay, INT_MAX); 5922 updelay = 0; 5923 } 5924 5925 if (downdelay < 0) { 5926 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 5927 downdelay, INT_MAX); 5928 downdelay = 0; 5929 } 5930 5931 if ((use_carrier != 0) && (use_carrier != 1)) { 5932 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 5933 use_carrier); 5934 use_carrier = 1; 5935 } 5936 5937 if (num_peer_notif < 0 || num_peer_notif > 255) { 5938 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 5939 num_peer_notif); 5940 num_peer_notif = 1; 5941 } 5942 5943 /* reset values for 802.3ad/TLB/ALB */ 5944 if (!bond_mode_uses_arp(bond_mode)) { 5945 if (!miimon) { 5946 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"); 5947 pr_warn("Forcing miimon to 100msec\n"); 5948 miimon = BOND_DEFAULT_MIIMON; 5949 } 5950 } 5951 5952 if (tx_queues < 1 || tx_queues > 255) { 5953 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n", 5954 tx_queues, BOND_DEFAULT_TX_QUEUES); 5955 tx_queues = BOND_DEFAULT_TX_QUEUES; 5956 } 5957 5958 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 5959 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n", 5960 all_slaves_active); 5961 all_slaves_active = 0; 5962 } 5963 5964 if (resend_igmp < 0 || resend_igmp > 255) { 5965 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n", 5966 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 5967 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 5968 } 5969 5970 bond_opt_initval(&newval, packets_per_slave); 5971 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) { 5972 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n", 5973 packets_per_slave, USHRT_MAX); 5974 packets_per_slave = 1; 5975 } 5976 5977 if (bond_mode == BOND_MODE_ALB) { 5978 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", 5979 updelay); 5980 } 5981 5982 if (!miimon) { 5983 if (updelay || downdelay) { 5984 /* just warn the user the up/down delay will have 5985 * no effect since miimon is zero... 5986 */ 5987 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", 5988 updelay, downdelay); 5989 } 5990 } else { 5991 /* don't allow arp monitoring */ 5992 if (arp_interval) { 5993 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 5994 miimon, arp_interval); 5995 arp_interval = 0; 5996 } 5997 5998 if ((updelay % miimon) != 0) { 5999 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 6000 updelay, miimon, (updelay / miimon) * miimon); 6001 } 6002 6003 updelay /= miimon; 6004 6005 if ((downdelay % miimon) != 0) { 6006 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 6007 downdelay, miimon, 6008 (downdelay / miimon) * miimon); 6009 } 6010 6011 downdelay /= miimon; 6012 } 6013 6014 if (arp_interval < 0) { 6015 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n", 6016 arp_interval, INT_MAX); 6017 arp_interval = 0; 6018 } 6019 6020 for (arp_ip_count = 0, i = 0; 6021 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) { 6022 __be32 ip; 6023 6024 /* not a complete check, but good enough to catch mistakes */ 6025 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) || 6026 !bond_is_ip_target_ok(ip)) { 6027 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 6028 arp_ip_target[i]); 6029 arp_interval = 0; 6030 } else { 6031 if (bond_get_targets_ip(arp_target, ip) == -1) 6032 arp_target[arp_ip_count++] = ip; 6033 else 6034 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n", 6035 &ip); 6036 } 6037 } 6038 6039 if (arp_interval && !arp_ip_count) { 6040 /* don't allow arping if no arp_ip_target given... */ 6041 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 6042 arp_interval); 6043 arp_interval = 0; 6044 } 6045 6046 if (arp_validate) { 6047 if (!arp_interval) { 6048 pr_err("arp_validate requires arp_interval\n"); 6049 return -EINVAL; 6050 } 6051 6052 bond_opt_initstr(&newval, arp_validate); 6053 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE), 6054 &newval); 6055 if (!valptr) { 6056 pr_err("Error: invalid arp_validate \"%s\"\n", 6057 arp_validate); 6058 return -EINVAL; 6059 } 6060 arp_validate_value = valptr->value; 6061 } else { 6062 arp_validate_value = 0; 6063 } 6064 6065 if (arp_all_targets) { 6066 bond_opt_initstr(&newval, arp_all_targets); 6067 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS), 6068 &newval); 6069 if (!valptr) { 6070 pr_err("Error: invalid arp_all_targets_value \"%s\"\n", 6071 arp_all_targets); 6072 arp_all_targets_value = 0; 6073 } else { 6074 arp_all_targets_value = valptr->value; 6075 } 6076 } 6077 6078 if (miimon) { 6079 pr_info("MII link monitoring set to %d ms\n", miimon); 6080 } else if (arp_interval) { 6081 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE, 6082 arp_validate_value); 6083 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 6084 arp_interval, valptr->string, arp_ip_count); 6085 6086 for (i = 0; i < arp_ip_count; i++) 6087 pr_cont(" %s", arp_ip_target[i]); 6088 6089 pr_cont("\n"); 6090 6091 } else if (max_bonds) { 6092 /* miimon and arp_interval not set, we need one so things 6093 * work as expected, see bonding.txt for details 6094 */ 6095 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"); 6096 } 6097 6098 if (primary && !bond_mode_uses_primary(bond_mode)) { 6099 /* currently, using a primary only makes sense 6100 * in active backup, TLB or ALB modes 6101 */ 6102 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n", 6103 primary, bond_mode_name(bond_mode)); 6104 primary = NULL; 6105 } 6106 6107 if (primary && primary_reselect) { 6108 bond_opt_initstr(&newval, primary_reselect); 6109 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT), 6110 &newval); 6111 if (!valptr) { 6112 pr_err("Error: Invalid primary_reselect \"%s\"\n", 6113 primary_reselect); 6114 return -EINVAL; 6115 } 6116 primary_reselect_value = valptr->value; 6117 } else { 6118 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 6119 } 6120 6121 if (fail_over_mac) { 6122 bond_opt_initstr(&newval, fail_over_mac); 6123 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC), 6124 &newval); 6125 if (!valptr) { 6126 pr_err("Error: invalid fail_over_mac \"%s\"\n", 6127 fail_over_mac); 6128 return -EINVAL; 6129 } 6130 fail_over_mac_value = valptr->value; 6131 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 6132 pr_warn("Warning: fail_over_mac only affects active-backup mode\n"); 6133 } else { 6134 fail_over_mac_value = BOND_FOM_NONE; 6135 } 6136 6137 bond_opt_initstr(&newval, "default"); 6138 valptr = bond_opt_parse( 6139 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO), 6140 &newval); 6141 if (!valptr) { 6142 pr_err("Error: No ad_actor_sys_prio default value"); 6143 return -EINVAL; 6144 } 6145 ad_actor_sys_prio = valptr->value; 6146 6147 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY), 6148 &newval); 6149 if (!valptr) { 6150 pr_err("Error: No ad_user_port_key default value"); 6151 return -EINVAL; 6152 } 6153 ad_user_port_key = valptr->value; 6154 6155 bond_opt_initstr(&newval, "default"); 6156 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval); 6157 if (!valptr) { 6158 pr_err("Error: No tlb_dynamic_lb default value"); 6159 return -EINVAL; 6160 } 6161 tlb_dynamic_lb = valptr->value; 6162 6163 if (lp_interval == 0) { 6164 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n", 6165 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL); 6166 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 6167 } 6168 6169 /* fill params struct with the proper values */ 6170 params->mode = bond_mode; 6171 params->xmit_policy = xmit_hashtype; 6172 params->miimon = miimon; 6173 params->num_peer_notif = num_peer_notif; 6174 params->arp_interval = arp_interval; 6175 params->arp_validate = arp_validate_value; 6176 params->arp_all_targets = arp_all_targets_value; 6177 params->missed_max = 2; 6178 params->updelay = updelay; 6179 params->downdelay = downdelay; 6180 params->peer_notif_delay = 0; 6181 params->use_carrier = use_carrier; 6182 params->lacp_active = 1; 6183 params->lacp_fast = lacp_fast; 6184 params->primary[0] = 0; 6185 params->primary_reselect = primary_reselect_value; 6186 params->fail_over_mac = fail_over_mac_value; 6187 params->tx_queues = tx_queues; 6188 params->all_slaves_active = all_slaves_active; 6189 params->resend_igmp = resend_igmp; 6190 params->min_links = min_links; 6191 params->lp_interval = lp_interval; 6192 params->packets_per_slave = packets_per_slave; 6193 params->tlb_dynamic_lb = tlb_dynamic_lb; 6194 params->ad_actor_sys_prio = ad_actor_sys_prio; 6195 eth_zero_addr(params->ad_actor_system); 6196 params->ad_user_port_key = ad_user_port_key; 6197 if (packets_per_slave > 0) { 6198 params->reciprocal_packets_per_slave = 6199 reciprocal_value(packets_per_slave); 6200 } else { 6201 /* reciprocal_packets_per_slave is unused if 6202 * packets_per_slave is 0 or 1, just initialize it 6203 */ 6204 params->reciprocal_packets_per_slave = 6205 (struct reciprocal_value) { 0 }; 6206 } 6207 6208 if (primary) 6209 strscpy_pad(params->primary, primary, sizeof(params->primary)); 6210 6211 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 6212 #if IS_ENABLED(CONFIG_IPV6) 6213 memset(params->ns_targets, 0, sizeof(struct in6_addr) * BOND_MAX_NS_TARGETS); 6214 #endif 6215 6216 return 0; 6217 } 6218 6219 /* Called from registration process */ 6220 static int bond_init(struct net_device *bond_dev) 6221 { 6222 struct bonding *bond = netdev_priv(bond_dev); 6223 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 6224 6225 netdev_dbg(bond_dev, "Begin bond_init\n"); 6226 6227 bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM); 6228 if (!bond->wq) 6229 return -ENOMEM; 6230 6231 if (BOND_MODE(bond) == BOND_MODE_ROUNDROBIN) { 6232 bond->rr_tx_counter = alloc_percpu(u32); 6233 if (!bond->rr_tx_counter) { 6234 destroy_workqueue(bond->wq); 6235 bond->wq = NULL; 6236 return -ENOMEM; 6237 } 6238 } 6239 6240 spin_lock_init(&bond->stats_lock); 6241 netdev_lockdep_set_classes(bond_dev); 6242 6243 list_add_tail(&bond->bond_list, &bn->dev_list); 6244 6245 bond_prepare_sysfs_group(bond); 6246 6247 bond_debug_register(bond); 6248 6249 /* Ensure valid dev_addr */ 6250 if (is_zero_ether_addr(bond_dev->dev_addr) && 6251 bond_dev->addr_assign_type == NET_ADDR_PERM) 6252 eth_hw_addr_random(bond_dev); 6253 6254 return 0; 6255 } 6256 6257 unsigned int bond_get_num_tx_queues(void) 6258 { 6259 return tx_queues; 6260 } 6261 6262 /* Create a new bond based on the specified name and bonding parameters. 6263 * If name is NULL, obtain a suitable "bond%d" name for us. 6264 * Caller must NOT hold rtnl_lock; we need to release it here before we 6265 * set up our sysfs entries. 6266 */ 6267 int bond_create(struct net *net, const char *name) 6268 { 6269 struct net_device *bond_dev; 6270 struct bonding *bond; 6271 int res = -ENOMEM; 6272 6273 rtnl_lock(); 6274 6275 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 6276 name ? name : "bond%d", NET_NAME_UNKNOWN, 6277 bond_setup, tx_queues); 6278 if (!bond_dev) 6279 goto out; 6280 6281 bond = netdev_priv(bond_dev); 6282 dev_net_set(bond_dev, net); 6283 bond_dev->rtnl_link_ops = &bond_link_ops; 6284 6285 res = register_netdevice(bond_dev); 6286 if (res < 0) { 6287 free_netdev(bond_dev); 6288 goto out; 6289 } 6290 6291 netif_carrier_off(bond_dev); 6292 6293 bond_work_init_all(bond); 6294 6295 out: 6296 rtnl_unlock(); 6297 return res; 6298 } 6299 6300 static int __net_init bond_net_init(struct net *net) 6301 { 6302 struct bond_net *bn = net_generic(net, bond_net_id); 6303 6304 bn->net = net; 6305 INIT_LIST_HEAD(&bn->dev_list); 6306 6307 bond_create_proc_dir(bn); 6308 bond_create_sysfs(bn); 6309 6310 return 0; 6311 } 6312 6313 static void __net_exit bond_net_exit_batch(struct list_head *net_list) 6314 { 6315 struct bond_net *bn; 6316 struct net *net; 6317 LIST_HEAD(list); 6318 6319 list_for_each_entry(net, net_list, exit_list) { 6320 bn = net_generic(net, bond_net_id); 6321 bond_destroy_sysfs(bn); 6322 } 6323 6324 /* Kill off any bonds created after unregistering bond rtnl ops */ 6325 rtnl_lock(); 6326 list_for_each_entry(net, net_list, exit_list) { 6327 struct bonding *bond, *tmp_bond; 6328 6329 bn = net_generic(net, bond_net_id); 6330 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list) 6331 unregister_netdevice_queue(bond->dev, &list); 6332 } 6333 unregister_netdevice_many(&list); 6334 rtnl_unlock(); 6335 6336 list_for_each_entry(net, net_list, exit_list) { 6337 bn = net_generic(net, bond_net_id); 6338 bond_destroy_proc_dir(bn); 6339 } 6340 } 6341 6342 static struct pernet_operations bond_net_ops = { 6343 .init = bond_net_init, 6344 .exit_batch = bond_net_exit_batch, 6345 .id = &bond_net_id, 6346 .size = sizeof(struct bond_net), 6347 }; 6348 6349 static int __init bonding_init(void) 6350 { 6351 int i; 6352 int res; 6353 6354 res = bond_check_params(&bonding_defaults); 6355 if (res) 6356 goto out; 6357 6358 res = register_pernet_subsys(&bond_net_ops); 6359 if (res) 6360 goto out; 6361 6362 res = bond_netlink_init(); 6363 if (res) 6364 goto err_link; 6365 6366 bond_create_debugfs(); 6367 6368 for (i = 0; i < max_bonds; i++) { 6369 res = bond_create(&init_net, NULL); 6370 if (res) 6371 goto err; 6372 } 6373 6374 skb_flow_dissector_init(&flow_keys_bonding, 6375 flow_keys_bonding_keys, 6376 ARRAY_SIZE(flow_keys_bonding_keys)); 6377 6378 register_netdevice_notifier(&bond_netdev_notifier); 6379 out: 6380 return res; 6381 err: 6382 bond_destroy_debugfs(); 6383 bond_netlink_fini(); 6384 err_link: 6385 unregister_pernet_subsys(&bond_net_ops); 6386 goto out; 6387 6388 } 6389 6390 static void __exit bonding_exit(void) 6391 { 6392 unregister_netdevice_notifier(&bond_netdev_notifier); 6393 6394 bond_destroy_debugfs(); 6395 6396 bond_netlink_fini(); 6397 unregister_pernet_subsys(&bond_net_ops); 6398 6399 #ifdef CONFIG_NET_POLL_CONTROLLER 6400 /* Make sure we don't have an imbalance on our netpoll blocking */ 6401 WARN_ON(atomic_read(&netpoll_block_tx)); 6402 #endif 6403 } 6404 6405 module_init(bonding_init); 6406 module_exit(bonding_exit); 6407 MODULE_LICENSE("GPL"); 6408 MODULE_DESCRIPTION(DRV_DESCRIPTION); 6409 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 6410