1 /* 2 * originally based on the dummy device. 3 * 4 * Copyright 1999, Thomas Davis, tadavis@lbl.gov. 5 * Licensed under the GPL. Based on dummy.c, and eql.c devices. 6 * 7 * bonding.c: an Ethernet Bonding driver 8 * 9 * This is useful to talk to a Cisco EtherChannel compatible equipment: 10 * Cisco 5500 11 * Sun Trunking (Solaris) 12 * Alteon AceDirector Trunks 13 * Linux Bonding 14 * and probably many L2 switches ... 15 * 16 * How it works: 17 * ifconfig bond0 ipaddress netmask up 18 * will setup a network device, with an ip address. No mac address 19 * will be assigned at this time. The hw mac address will come from 20 * the first slave bonded to the channel. All slaves will then use 21 * this hw mac address. 22 * 23 * ifconfig bond0 down 24 * will release all slaves, marking them as down. 25 * 26 * ifenslave bond0 eth0 27 * will attach eth0 to bond0 as a slave. eth0 hw mac address will either 28 * a: be used as initial mac address 29 * b: if a hw mac address already is there, eth0's hw mac address 30 * will then be set from bond0. 31 * 32 */ 33 34 #include <linux/kernel.h> 35 #include <linux/module.h> 36 #include <linux/types.h> 37 #include <linux/fcntl.h> 38 #include <linux/filter.h> 39 #include <linux/interrupt.h> 40 #include <linux/ptrace.h> 41 #include <linux/ioport.h> 42 #include <linux/in.h> 43 #include <net/ip.h> 44 #include <linux/ip.h> 45 #include <linux/icmp.h> 46 #include <linux/icmpv6.h> 47 #include <linux/tcp.h> 48 #include <linux/udp.h> 49 #include <linux/slab.h> 50 #include <linux/string.h> 51 #include <linux/init.h> 52 #include <linux/timer.h> 53 #include <linux/socket.h> 54 #include <linux/ctype.h> 55 #include <linux/inet.h> 56 #include <linux/bitops.h> 57 #include <linux/io.h> 58 #include <asm/dma.h> 59 #include <linux/uaccess.h> 60 #include <linux/errno.h> 61 #include <linux/netdevice.h> 62 #include <linux/inetdevice.h> 63 #include <linux/igmp.h> 64 #include <linux/etherdevice.h> 65 #include <linux/skbuff.h> 66 #include <net/sock.h> 67 #include <linux/rtnetlink.h> 68 #include <linux/smp.h> 69 #include <linux/if_ether.h> 70 #include <net/arp.h> 71 #include <linux/mii.h> 72 #include <linux/ethtool.h> 73 #include <linux/if_vlan.h> 74 #include <linux/if_bonding.h> 75 #include <linux/phy.h> 76 #include <linux/jiffies.h> 77 #include <linux/preempt.h> 78 #include <net/route.h> 79 #include <net/net_namespace.h> 80 #include <net/netns/generic.h> 81 #include <net/pkt_sched.h> 82 #include <linux/rculist.h> 83 #include <net/flow_dissector.h> 84 #include <net/xfrm.h> 85 #include <net/bonding.h> 86 #include <net/bond_3ad.h> 87 #include <net/bond_alb.h> 88 #if IS_ENABLED(CONFIG_TLS_DEVICE) 89 #include <net/tls.h> 90 #endif 91 #include <net/ip6_route.h> 92 93 #include "bonding_priv.h" 94 95 /*---------------------------- Module parameters ----------------------------*/ 96 97 /* monitor all links that often (in milliseconds). <=0 disables monitoring */ 98 99 static int max_bonds = BOND_DEFAULT_MAX_BONDS; 100 static int tx_queues = BOND_DEFAULT_TX_QUEUES; 101 static int num_peer_notif = 1; 102 static int miimon; 103 static int updelay; 104 static int downdelay; 105 static int use_carrier = 1; 106 static char *mode; 107 static char *primary; 108 static char *primary_reselect; 109 static char *lacp_rate; 110 static int min_links; 111 static char *ad_select; 112 static char *xmit_hash_policy; 113 static int arp_interval; 114 static char *arp_ip_target[BOND_MAX_ARP_TARGETS]; 115 static char *arp_validate; 116 static char *arp_all_targets; 117 static char *fail_over_mac; 118 static int all_slaves_active; 119 static struct bond_params bonding_defaults; 120 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP; 121 static int packets_per_slave = 1; 122 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 123 124 module_param(max_bonds, int, 0); 125 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices"); 126 module_param(tx_queues, int, 0); 127 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)"); 128 module_param_named(num_grat_arp, num_peer_notif, int, 0644); 129 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on " 130 "failover event (alias of num_unsol_na)"); 131 module_param_named(num_unsol_na, num_peer_notif, int, 0644); 132 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on " 133 "failover event (alias of num_grat_arp)"); 134 module_param(miimon, int, 0); 135 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds"); 136 module_param(updelay, int, 0); 137 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds"); 138 module_param(downdelay, int, 0); 139 MODULE_PARM_DESC(downdelay, "Delay before considering link down, " 140 "in milliseconds"); 141 module_param(use_carrier, int, 0); 142 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; " 143 "0 for off, 1 for on (default)"); 144 module_param(mode, charp, 0); 145 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, " 146 "1 for active-backup, 2 for balance-xor, " 147 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, " 148 "6 for balance-alb"); 149 module_param(primary, charp, 0); 150 MODULE_PARM_DESC(primary, "Primary network device to use"); 151 module_param(primary_reselect, charp, 0); 152 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave " 153 "once it comes up; " 154 "0 for always (default), " 155 "1 for only if speed of primary is " 156 "better, " 157 "2 for only on active slave " 158 "failure"); 159 module_param(lacp_rate, charp, 0); 160 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; " 161 "0 for slow, 1 for fast"); 162 module_param(ad_select, charp, 0); 163 MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; " 164 "0 for stable (default), 1 for bandwidth, " 165 "2 for count"); 166 module_param(min_links, int, 0); 167 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier"); 168 169 module_param(xmit_hash_policy, charp, 0); 170 MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; " 171 "0 for layer 2 (default), 1 for layer 3+4, " 172 "2 for layer 2+3, 3 for encap layer 2+3, " 173 "4 for encap layer 3+4, 5 for vlan+srcmac"); 174 module_param(arp_interval, int, 0); 175 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds"); 176 module_param_array(arp_ip_target, charp, NULL, 0); 177 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form"); 178 module_param(arp_validate, charp, 0); 179 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; " 180 "0 for none (default), 1 for active, " 181 "2 for backup, 3 for all"); 182 module_param(arp_all_targets, charp, 0); 183 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all"); 184 module_param(fail_over_mac, charp, 0); 185 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to " 186 "the same MAC; 0 for none (default), " 187 "1 for active, 2 for follow"); 188 module_param(all_slaves_active, int, 0); 189 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface " 190 "by setting active flag for all slaves; " 191 "0 for never (default), 1 for always."); 192 module_param(resend_igmp, int, 0); 193 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on " 194 "link failure"); 195 module_param(packets_per_slave, int, 0); 196 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr " 197 "mode; 0 for a random slave, 1 packet per " 198 "slave (default), >1 packets per slave."); 199 module_param(lp_interval, uint, 0); 200 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where " 201 "the bonding driver sends learning packets to " 202 "each slaves peer switch. The default is 1."); 203 204 /*----------------------------- Global variables ----------------------------*/ 205 206 #ifdef CONFIG_NET_POLL_CONTROLLER 207 atomic_t netpoll_block_tx = ATOMIC_INIT(0); 208 #endif 209 210 unsigned int bond_net_id __read_mostly; 211 212 static const struct flow_dissector_key flow_keys_bonding_keys[] = { 213 { 214 .key_id = FLOW_DISSECTOR_KEY_CONTROL, 215 .offset = offsetof(struct flow_keys, control), 216 }, 217 { 218 .key_id = FLOW_DISSECTOR_KEY_BASIC, 219 .offset = offsetof(struct flow_keys, basic), 220 }, 221 { 222 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS, 223 .offset = offsetof(struct flow_keys, addrs.v4addrs), 224 }, 225 { 226 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS, 227 .offset = offsetof(struct flow_keys, addrs.v6addrs), 228 }, 229 { 230 .key_id = FLOW_DISSECTOR_KEY_TIPC, 231 .offset = offsetof(struct flow_keys, addrs.tipckey), 232 }, 233 { 234 .key_id = FLOW_DISSECTOR_KEY_PORTS, 235 .offset = offsetof(struct flow_keys, ports), 236 }, 237 { 238 .key_id = FLOW_DISSECTOR_KEY_ICMP, 239 .offset = offsetof(struct flow_keys, icmp), 240 }, 241 { 242 .key_id = FLOW_DISSECTOR_KEY_VLAN, 243 .offset = offsetof(struct flow_keys, vlan), 244 }, 245 { 246 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL, 247 .offset = offsetof(struct flow_keys, tags), 248 }, 249 { 250 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID, 251 .offset = offsetof(struct flow_keys, keyid), 252 }, 253 }; 254 255 static struct flow_dissector flow_keys_bonding __read_mostly; 256 257 /*-------------------------- Forward declarations ---------------------------*/ 258 259 static int bond_init(struct net_device *bond_dev); 260 static void bond_uninit(struct net_device *bond_dev); 261 static void bond_get_stats(struct net_device *bond_dev, 262 struct rtnl_link_stats64 *stats); 263 static void bond_slave_arr_handler(struct work_struct *work); 264 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 265 int mod); 266 static void bond_netdev_notify_work(struct work_struct *work); 267 268 /*---------------------------- General routines -----------------------------*/ 269 270 const char *bond_mode_name(int mode) 271 { 272 static const char *names[] = { 273 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)", 274 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)", 275 [BOND_MODE_XOR] = "load balancing (xor)", 276 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)", 277 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation", 278 [BOND_MODE_TLB] = "transmit load balancing", 279 [BOND_MODE_ALB] = "adaptive load balancing", 280 }; 281 282 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB) 283 return "unknown"; 284 285 return names[mode]; 286 } 287 288 /** 289 * bond_dev_queue_xmit - Prepare skb for xmit. 290 * 291 * @bond: bond device that got this skb for tx. 292 * @skb: hw accel VLAN tagged skb to transmit 293 * @slave_dev: slave that is supposed to xmit this skbuff 294 */ 295 netdev_tx_t bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, 296 struct net_device *slave_dev) 297 { 298 skb->dev = slave_dev; 299 300 BUILD_BUG_ON(sizeof(skb->queue_mapping) != 301 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping)); 302 skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping); 303 304 if (unlikely(netpoll_tx_running(bond->dev))) 305 return bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb); 306 307 return dev_queue_xmit(skb); 308 } 309 310 bool bond_sk_check(struct bonding *bond) 311 { 312 switch (BOND_MODE(bond)) { 313 case BOND_MODE_8023AD: 314 case BOND_MODE_XOR: 315 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34) 316 return true; 317 fallthrough; 318 default: 319 return false; 320 } 321 } 322 323 static bool bond_xdp_check(struct bonding *bond) 324 { 325 switch (BOND_MODE(bond)) { 326 case BOND_MODE_ROUNDROBIN: 327 case BOND_MODE_ACTIVEBACKUP: 328 return true; 329 case BOND_MODE_8023AD: 330 case BOND_MODE_XOR: 331 /* vlan+srcmac is not supported with XDP as in most cases the 802.1q 332 * payload is not in the packet due to hardware offload. 333 */ 334 if (bond->params.xmit_policy != BOND_XMIT_POLICY_VLAN_SRCMAC) 335 return true; 336 fallthrough; 337 default: 338 return false; 339 } 340 } 341 342 /*---------------------------------- VLAN -----------------------------------*/ 343 344 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid, 345 * We don't protect the slave list iteration with a lock because: 346 * a. This operation is performed in IOCTL context, 347 * b. The operation is protected by the RTNL semaphore in the 8021q code, 348 * c. Holding a lock with BH disabled while directly calling a base driver 349 * entry point is generally a BAD idea. 350 * 351 * The design of synchronization/protection for this operation in the 8021q 352 * module is good for one or more VLAN devices over a single physical device 353 * and cannot be extended for a teaming solution like bonding, so there is a 354 * potential race condition here where a net device from the vlan group might 355 * be referenced (either by a base driver or the 8021q code) while it is being 356 * removed from the system. However, it turns out we're not making matters 357 * worse, and if it works for regular VLAN usage it will work here too. 358 */ 359 360 /** 361 * bond_vlan_rx_add_vid - Propagates adding an id to slaves 362 * @bond_dev: bonding net device that got called 363 * @proto: network protocol ID 364 * @vid: vlan id being added 365 */ 366 static int bond_vlan_rx_add_vid(struct net_device *bond_dev, 367 __be16 proto, u16 vid) 368 { 369 struct bonding *bond = netdev_priv(bond_dev); 370 struct slave *slave, *rollback_slave; 371 struct list_head *iter; 372 int res; 373 374 bond_for_each_slave(bond, slave, iter) { 375 res = vlan_vid_add(slave->dev, proto, vid); 376 if (res) 377 goto unwind; 378 } 379 380 return 0; 381 382 unwind: 383 /* unwind to the slave that failed */ 384 bond_for_each_slave(bond, rollback_slave, iter) { 385 if (rollback_slave == slave) 386 break; 387 388 vlan_vid_del(rollback_slave->dev, proto, vid); 389 } 390 391 return res; 392 } 393 394 /** 395 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves 396 * @bond_dev: bonding net device that got called 397 * @proto: network protocol ID 398 * @vid: vlan id being removed 399 */ 400 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, 401 __be16 proto, u16 vid) 402 { 403 struct bonding *bond = netdev_priv(bond_dev); 404 struct list_head *iter; 405 struct slave *slave; 406 407 bond_for_each_slave(bond, slave, iter) 408 vlan_vid_del(slave->dev, proto, vid); 409 410 if (bond_is_lb(bond)) 411 bond_alb_clear_vlan(bond, vid); 412 413 return 0; 414 } 415 416 /*---------------------------------- XFRM -----------------------------------*/ 417 418 #ifdef CONFIG_XFRM_OFFLOAD 419 /** 420 * bond_ipsec_add_sa - program device with a security association 421 * @xs: pointer to transformer state struct 422 **/ 423 static int bond_ipsec_add_sa(struct xfrm_state *xs) 424 { 425 struct net_device *bond_dev = xs->xso.dev; 426 struct bond_ipsec *ipsec; 427 struct bonding *bond; 428 struct slave *slave; 429 int err; 430 431 if (!bond_dev) 432 return -EINVAL; 433 434 rcu_read_lock(); 435 bond = netdev_priv(bond_dev); 436 slave = rcu_dereference(bond->curr_active_slave); 437 if (!slave) { 438 rcu_read_unlock(); 439 return -ENODEV; 440 } 441 442 if (!slave->dev->xfrmdev_ops || 443 !slave->dev->xfrmdev_ops->xdo_dev_state_add || 444 netif_is_bond_master(slave->dev)) { 445 slave_warn(bond_dev, slave->dev, "Slave does not support ipsec offload\n"); 446 rcu_read_unlock(); 447 return -EINVAL; 448 } 449 450 ipsec = kmalloc(sizeof(*ipsec), GFP_ATOMIC); 451 if (!ipsec) { 452 rcu_read_unlock(); 453 return -ENOMEM; 454 } 455 xs->xso.real_dev = slave->dev; 456 457 err = slave->dev->xfrmdev_ops->xdo_dev_state_add(xs); 458 if (!err) { 459 ipsec->xs = xs; 460 INIT_LIST_HEAD(&ipsec->list); 461 spin_lock_bh(&bond->ipsec_lock); 462 list_add(&ipsec->list, &bond->ipsec_list); 463 spin_unlock_bh(&bond->ipsec_lock); 464 } else { 465 kfree(ipsec); 466 } 467 rcu_read_unlock(); 468 return err; 469 } 470 471 static void bond_ipsec_add_sa_all(struct bonding *bond) 472 { 473 struct net_device *bond_dev = bond->dev; 474 struct bond_ipsec *ipsec; 475 struct slave *slave; 476 477 rcu_read_lock(); 478 slave = rcu_dereference(bond->curr_active_slave); 479 if (!slave) 480 goto out; 481 482 if (!slave->dev->xfrmdev_ops || 483 !slave->dev->xfrmdev_ops->xdo_dev_state_add || 484 netif_is_bond_master(slave->dev)) { 485 spin_lock_bh(&bond->ipsec_lock); 486 if (!list_empty(&bond->ipsec_list)) 487 slave_warn(bond_dev, slave->dev, 488 "%s: no slave xdo_dev_state_add\n", 489 __func__); 490 spin_unlock_bh(&bond->ipsec_lock); 491 goto out; 492 } 493 494 spin_lock_bh(&bond->ipsec_lock); 495 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 496 ipsec->xs->xso.real_dev = slave->dev; 497 if (slave->dev->xfrmdev_ops->xdo_dev_state_add(ipsec->xs)) { 498 slave_warn(bond_dev, slave->dev, "%s: failed to add SA\n", __func__); 499 ipsec->xs->xso.real_dev = NULL; 500 } 501 } 502 spin_unlock_bh(&bond->ipsec_lock); 503 out: 504 rcu_read_unlock(); 505 } 506 507 /** 508 * bond_ipsec_del_sa - clear out this specific SA 509 * @xs: pointer to transformer state struct 510 **/ 511 static void bond_ipsec_del_sa(struct xfrm_state *xs) 512 { 513 struct net_device *bond_dev = xs->xso.dev; 514 struct bond_ipsec *ipsec; 515 struct bonding *bond; 516 struct slave *slave; 517 518 if (!bond_dev) 519 return; 520 521 rcu_read_lock(); 522 bond = netdev_priv(bond_dev); 523 slave = rcu_dereference(bond->curr_active_slave); 524 525 if (!slave) 526 goto out; 527 528 if (!xs->xso.real_dev) 529 goto out; 530 531 WARN_ON(xs->xso.real_dev != slave->dev); 532 533 if (!slave->dev->xfrmdev_ops || 534 !slave->dev->xfrmdev_ops->xdo_dev_state_delete || 535 netif_is_bond_master(slave->dev)) { 536 slave_warn(bond_dev, slave->dev, "%s: no slave xdo_dev_state_delete\n", __func__); 537 goto out; 538 } 539 540 slave->dev->xfrmdev_ops->xdo_dev_state_delete(xs); 541 out: 542 spin_lock_bh(&bond->ipsec_lock); 543 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 544 if (ipsec->xs == xs) { 545 list_del(&ipsec->list); 546 kfree(ipsec); 547 break; 548 } 549 } 550 spin_unlock_bh(&bond->ipsec_lock); 551 rcu_read_unlock(); 552 } 553 554 static void bond_ipsec_del_sa_all(struct bonding *bond) 555 { 556 struct net_device *bond_dev = bond->dev; 557 struct bond_ipsec *ipsec; 558 struct slave *slave; 559 560 rcu_read_lock(); 561 slave = rcu_dereference(bond->curr_active_slave); 562 if (!slave) { 563 rcu_read_unlock(); 564 return; 565 } 566 567 spin_lock_bh(&bond->ipsec_lock); 568 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 569 if (!ipsec->xs->xso.real_dev) 570 continue; 571 572 if (!slave->dev->xfrmdev_ops || 573 !slave->dev->xfrmdev_ops->xdo_dev_state_delete || 574 netif_is_bond_master(slave->dev)) { 575 slave_warn(bond_dev, slave->dev, 576 "%s: no slave xdo_dev_state_delete\n", 577 __func__); 578 } else { 579 slave->dev->xfrmdev_ops->xdo_dev_state_delete(ipsec->xs); 580 } 581 ipsec->xs->xso.real_dev = NULL; 582 } 583 spin_unlock_bh(&bond->ipsec_lock); 584 rcu_read_unlock(); 585 } 586 587 /** 588 * bond_ipsec_offload_ok - can this packet use the xfrm hw offload 589 * @skb: current data packet 590 * @xs: pointer to transformer state struct 591 **/ 592 static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs) 593 { 594 struct net_device *bond_dev = xs->xso.dev; 595 struct net_device *real_dev; 596 struct slave *curr_active; 597 struct bonding *bond; 598 int err; 599 600 bond = netdev_priv(bond_dev); 601 rcu_read_lock(); 602 curr_active = rcu_dereference(bond->curr_active_slave); 603 real_dev = curr_active->dev; 604 605 if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 606 err = false; 607 goto out; 608 } 609 610 if (!xs->xso.real_dev) { 611 err = false; 612 goto out; 613 } 614 615 if (!real_dev->xfrmdev_ops || 616 !real_dev->xfrmdev_ops->xdo_dev_offload_ok || 617 netif_is_bond_master(real_dev)) { 618 err = false; 619 goto out; 620 } 621 622 err = real_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs); 623 out: 624 rcu_read_unlock(); 625 return err; 626 } 627 628 static const struct xfrmdev_ops bond_xfrmdev_ops = { 629 .xdo_dev_state_add = bond_ipsec_add_sa, 630 .xdo_dev_state_delete = bond_ipsec_del_sa, 631 .xdo_dev_offload_ok = bond_ipsec_offload_ok, 632 }; 633 #endif /* CONFIG_XFRM_OFFLOAD */ 634 635 /*------------------------------- Link status -------------------------------*/ 636 637 /* Set the carrier state for the master according to the state of its 638 * slaves. If any slaves are up, the master is up. In 802.3ad mode, 639 * do special 802.3ad magic. 640 * 641 * Returns zero if carrier state does not change, nonzero if it does. 642 */ 643 int bond_set_carrier(struct bonding *bond) 644 { 645 struct list_head *iter; 646 struct slave *slave; 647 648 if (!bond_has_slaves(bond)) 649 goto down; 650 651 if (BOND_MODE(bond) == BOND_MODE_8023AD) 652 return bond_3ad_set_carrier(bond); 653 654 bond_for_each_slave(bond, slave, iter) { 655 if (slave->link == BOND_LINK_UP) { 656 if (!netif_carrier_ok(bond->dev)) { 657 netif_carrier_on(bond->dev); 658 return 1; 659 } 660 return 0; 661 } 662 } 663 664 down: 665 if (netif_carrier_ok(bond->dev)) { 666 netif_carrier_off(bond->dev); 667 return 1; 668 } 669 return 0; 670 } 671 672 /* Get link speed and duplex from the slave's base driver 673 * using ethtool. If for some reason the call fails or the 674 * values are invalid, set speed and duplex to -1, 675 * and return. Return 1 if speed or duplex settings are 676 * UNKNOWN; 0 otherwise. 677 */ 678 static int bond_update_speed_duplex(struct slave *slave) 679 { 680 struct net_device *slave_dev = slave->dev; 681 struct ethtool_link_ksettings ecmd; 682 int res; 683 684 slave->speed = SPEED_UNKNOWN; 685 slave->duplex = DUPLEX_UNKNOWN; 686 687 res = __ethtool_get_link_ksettings(slave_dev, &ecmd); 688 if (res < 0) 689 return 1; 690 if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1)) 691 return 1; 692 switch (ecmd.base.duplex) { 693 case DUPLEX_FULL: 694 case DUPLEX_HALF: 695 break; 696 default: 697 return 1; 698 } 699 700 slave->speed = ecmd.base.speed; 701 slave->duplex = ecmd.base.duplex; 702 703 return 0; 704 } 705 706 const char *bond_slave_link_status(s8 link) 707 { 708 switch (link) { 709 case BOND_LINK_UP: 710 return "up"; 711 case BOND_LINK_FAIL: 712 return "going down"; 713 case BOND_LINK_DOWN: 714 return "down"; 715 case BOND_LINK_BACK: 716 return "going back"; 717 default: 718 return "unknown"; 719 } 720 } 721 722 /* if <dev> supports MII link status reporting, check its link status. 723 * 724 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), 725 * depending upon the setting of the use_carrier parameter. 726 * 727 * Return either BMSR_LSTATUS, meaning that the link is up (or we 728 * can't tell and just pretend it is), or 0, meaning that the link is 729 * down. 730 * 731 * If reporting is non-zero, instead of faking link up, return -1 if 732 * both ETHTOOL and MII ioctls fail (meaning the device does not 733 * support them). If use_carrier is set, return whatever it says. 734 * It'd be nice if there was a good way to tell if a driver supports 735 * netif_carrier, but there really isn't. 736 */ 737 static int bond_check_dev_link(struct bonding *bond, 738 struct net_device *slave_dev, int reporting) 739 { 740 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 741 int (*ioctl)(struct net_device *, struct ifreq *, int); 742 struct ifreq ifr; 743 struct mii_ioctl_data *mii; 744 745 if (!reporting && !netif_running(slave_dev)) 746 return 0; 747 748 if (bond->params.use_carrier) 749 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; 750 751 /* Try to get link status using Ethtool first. */ 752 if (slave_dev->ethtool_ops->get_link) 753 return slave_dev->ethtool_ops->get_link(slave_dev) ? 754 BMSR_LSTATUS : 0; 755 756 /* Ethtool can't be used, fallback to MII ioctls. */ 757 ioctl = slave_ops->ndo_eth_ioctl; 758 if (ioctl) { 759 /* TODO: set pointer to correct ioctl on a per team member 760 * bases to make this more efficient. that is, once 761 * we determine the correct ioctl, we will always 762 * call it and not the others for that team 763 * member. 764 */ 765 766 /* We cannot assume that SIOCGMIIPHY will also read a 767 * register; not all network drivers (e.g., e100) 768 * support that. 769 */ 770 771 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ 772 strscpy_pad(ifr.ifr_name, slave_dev->name, IFNAMSIZ); 773 mii = if_mii(&ifr); 774 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) { 775 mii->reg_num = MII_BMSR; 776 if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0) 777 return mii->val_out & BMSR_LSTATUS; 778 } 779 } 780 781 /* If reporting, report that either there's no ndo_eth_ioctl, 782 * or both SIOCGMIIREG and get_link failed (meaning that we 783 * cannot report link status). If not reporting, pretend 784 * we're ok. 785 */ 786 return reporting ? -1 : BMSR_LSTATUS; 787 } 788 789 /*----------------------------- Multicast list ------------------------------*/ 790 791 /* Push the promiscuity flag down to appropriate slaves */ 792 static int bond_set_promiscuity(struct bonding *bond, int inc) 793 { 794 struct list_head *iter; 795 int err = 0; 796 797 if (bond_uses_primary(bond)) { 798 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 799 800 if (curr_active) 801 err = dev_set_promiscuity(curr_active->dev, inc); 802 } else { 803 struct slave *slave; 804 805 bond_for_each_slave(bond, slave, iter) { 806 err = dev_set_promiscuity(slave->dev, inc); 807 if (err) 808 return err; 809 } 810 } 811 return err; 812 } 813 814 /* Push the allmulti flag down to all slaves */ 815 static int bond_set_allmulti(struct bonding *bond, int inc) 816 { 817 struct list_head *iter; 818 int err = 0; 819 820 if (bond_uses_primary(bond)) { 821 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 822 823 if (curr_active) 824 err = dev_set_allmulti(curr_active->dev, inc); 825 } else { 826 struct slave *slave; 827 828 bond_for_each_slave(bond, slave, iter) { 829 err = dev_set_allmulti(slave->dev, inc); 830 if (err) 831 return err; 832 } 833 } 834 return err; 835 } 836 837 /* Retrieve the list of registered multicast addresses for the bonding 838 * device and retransmit an IGMP JOIN request to the current active 839 * slave. 840 */ 841 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work) 842 { 843 struct bonding *bond = container_of(work, struct bonding, 844 mcast_work.work); 845 846 if (!rtnl_trylock()) { 847 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 848 return; 849 } 850 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev); 851 852 if (bond->igmp_retrans > 1) { 853 bond->igmp_retrans--; 854 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); 855 } 856 rtnl_unlock(); 857 } 858 859 /* Flush bond's hardware addresses from slave */ 860 static void bond_hw_addr_flush(struct net_device *bond_dev, 861 struct net_device *slave_dev) 862 { 863 struct bonding *bond = netdev_priv(bond_dev); 864 865 dev_uc_unsync(slave_dev, bond_dev); 866 dev_mc_unsync(slave_dev, bond_dev); 867 868 if (BOND_MODE(bond) == BOND_MODE_8023AD) 869 dev_mc_del(slave_dev, lacpdu_mcast_addr); 870 } 871 872 /*--------------------------- Active slave change ---------------------------*/ 873 874 /* Update the hardware address list and promisc/allmulti for the new and 875 * old active slaves (if any). Modes that are not using primary keep all 876 * slaves up date at all times; only the modes that use primary need to call 877 * this function to swap these settings during a failover. 878 */ 879 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active, 880 struct slave *old_active) 881 { 882 if (old_active) { 883 if (bond->dev->flags & IFF_PROMISC) 884 dev_set_promiscuity(old_active->dev, -1); 885 886 if (bond->dev->flags & IFF_ALLMULTI) 887 dev_set_allmulti(old_active->dev, -1); 888 889 if (bond->dev->flags & IFF_UP) 890 bond_hw_addr_flush(bond->dev, old_active->dev); 891 } 892 893 if (new_active) { 894 /* FIXME: Signal errors upstream. */ 895 if (bond->dev->flags & IFF_PROMISC) 896 dev_set_promiscuity(new_active->dev, 1); 897 898 if (bond->dev->flags & IFF_ALLMULTI) 899 dev_set_allmulti(new_active->dev, 1); 900 901 if (bond->dev->flags & IFF_UP) { 902 netif_addr_lock_bh(bond->dev); 903 dev_uc_sync(new_active->dev, bond->dev); 904 dev_mc_sync(new_active->dev, bond->dev); 905 netif_addr_unlock_bh(bond->dev); 906 } 907 } 908 } 909 910 /** 911 * bond_set_dev_addr - clone slave's address to bond 912 * @bond_dev: bond net device 913 * @slave_dev: slave net device 914 * 915 * Should be called with RTNL held. 916 */ 917 static int bond_set_dev_addr(struct net_device *bond_dev, 918 struct net_device *slave_dev) 919 { 920 int err; 921 922 slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n", 923 bond_dev, slave_dev, slave_dev->addr_len); 924 err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL); 925 if (err) 926 return err; 927 928 __dev_addr_set(bond_dev, slave_dev->dev_addr, slave_dev->addr_len); 929 bond_dev->addr_assign_type = NET_ADDR_STOLEN; 930 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev); 931 return 0; 932 } 933 934 static struct slave *bond_get_old_active(struct bonding *bond, 935 struct slave *new_active) 936 { 937 struct slave *slave; 938 struct list_head *iter; 939 940 bond_for_each_slave(bond, slave, iter) { 941 if (slave == new_active) 942 continue; 943 944 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr)) 945 return slave; 946 } 947 948 return NULL; 949 } 950 951 /* bond_do_fail_over_mac 952 * 953 * Perform special MAC address swapping for fail_over_mac settings 954 * 955 * Called with RTNL 956 */ 957 static void bond_do_fail_over_mac(struct bonding *bond, 958 struct slave *new_active, 959 struct slave *old_active) 960 { 961 u8 tmp_mac[MAX_ADDR_LEN]; 962 struct sockaddr_storage ss; 963 int rv; 964 965 switch (bond->params.fail_over_mac) { 966 case BOND_FOM_ACTIVE: 967 if (new_active) { 968 rv = bond_set_dev_addr(bond->dev, new_active->dev); 969 if (rv) 970 slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n", 971 -rv); 972 } 973 break; 974 case BOND_FOM_FOLLOW: 975 /* if new_active && old_active, swap them 976 * if just old_active, do nothing (going to no active slave) 977 * if just new_active, set new_active to bond's MAC 978 */ 979 if (!new_active) 980 return; 981 982 if (!old_active) 983 old_active = bond_get_old_active(bond, new_active); 984 985 if (old_active) { 986 bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr, 987 new_active->dev->addr_len); 988 bond_hw_addr_copy(ss.__data, 989 old_active->dev->dev_addr, 990 old_active->dev->addr_len); 991 ss.ss_family = new_active->dev->type; 992 } else { 993 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr, 994 bond->dev->addr_len); 995 ss.ss_family = bond->dev->type; 996 } 997 998 rv = dev_set_mac_address(new_active->dev, 999 (struct sockaddr *)&ss, NULL); 1000 if (rv) { 1001 slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n", 1002 -rv); 1003 goto out; 1004 } 1005 1006 if (!old_active) 1007 goto out; 1008 1009 bond_hw_addr_copy(ss.__data, tmp_mac, 1010 new_active->dev->addr_len); 1011 ss.ss_family = old_active->dev->type; 1012 1013 rv = dev_set_mac_address(old_active->dev, 1014 (struct sockaddr *)&ss, NULL); 1015 if (rv) 1016 slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n", 1017 -rv); 1018 out: 1019 break; 1020 default: 1021 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n", 1022 bond->params.fail_over_mac); 1023 break; 1024 } 1025 1026 } 1027 1028 /** 1029 * bond_choose_primary_or_current - select the primary or high priority slave 1030 * @bond: our bonding struct 1031 * 1032 * - Check if there is a primary link. If the primary link was set and is up, 1033 * go on and do link reselection. 1034 * 1035 * - If primary link is not set or down, find the highest priority link. 1036 * If the highest priority link is not current slave, set it as primary 1037 * link and do link reselection. 1038 */ 1039 static struct slave *bond_choose_primary_or_current(struct bonding *bond) 1040 { 1041 struct slave *prim = rtnl_dereference(bond->primary_slave); 1042 struct slave *curr = rtnl_dereference(bond->curr_active_slave); 1043 struct slave *slave, *hprio = NULL; 1044 struct list_head *iter; 1045 1046 if (!prim || prim->link != BOND_LINK_UP) { 1047 bond_for_each_slave(bond, slave, iter) { 1048 if (slave->link == BOND_LINK_UP) { 1049 hprio = hprio ?: slave; 1050 if (slave->prio > hprio->prio) 1051 hprio = slave; 1052 } 1053 } 1054 1055 if (hprio && hprio != curr) { 1056 prim = hprio; 1057 goto link_reselect; 1058 } 1059 1060 if (!curr || curr->link != BOND_LINK_UP) 1061 return NULL; 1062 return curr; 1063 } 1064 1065 if (bond->force_primary) { 1066 bond->force_primary = false; 1067 return prim; 1068 } 1069 1070 link_reselect: 1071 if (!curr || curr->link != BOND_LINK_UP) 1072 return prim; 1073 1074 /* At this point, prim and curr are both up */ 1075 switch (bond->params.primary_reselect) { 1076 case BOND_PRI_RESELECT_ALWAYS: 1077 return prim; 1078 case BOND_PRI_RESELECT_BETTER: 1079 if (prim->speed < curr->speed) 1080 return curr; 1081 if (prim->speed == curr->speed && prim->duplex <= curr->duplex) 1082 return curr; 1083 return prim; 1084 case BOND_PRI_RESELECT_FAILURE: 1085 return curr; 1086 default: 1087 netdev_err(bond->dev, "impossible primary_reselect %d\n", 1088 bond->params.primary_reselect); 1089 return curr; 1090 } 1091 } 1092 1093 /** 1094 * bond_find_best_slave - select the best available slave to be the active one 1095 * @bond: our bonding struct 1096 */ 1097 static struct slave *bond_find_best_slave(struct bonding *bond) 1098 { 1099 struct slave *slave, *bestslave = NULL; 1100 struct list_head *iter; 1101 int mintime = bond->params.updelay; 1102 1103 slave = bond_choose_primary_or_current(bond); 1104 if (slave) 1105 return slave; 1106 1107 bond_for_each_slave(bond, slave, iter) { 1108 if (slave->link == BOND_LINK_UP) 1109 return slave; 1110 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) && 1111 slave->delay < mintime) { 1112 mintime = slave->delay; 1113 bestslave = slave; 1114 } 1115 } 1116 1117 return bestslave; 1118 } 1119 1120 static bool bond_should_notify_peers(struct bonding *bond) 1121 { 1122 struct slave *slave; 1123 1124 rcu_read_lock(); 1125 slave = rcu_dereference(bond->curr_active_slave); 1126 rcu_read_unlock(); 1127 1128 if (!slave || !bond->send_peer_notif || 1129 bond->send_peer_notif % 1130 max(1, bond->params.peer_notif_delay) != 0 || 1131 !netif_carrier_ok(bond->dev) || 1132 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) 1133 return false; 1134 1135 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n", 1136 slave ? slave->dev->name : "NULL"); 1137 1138 return true; 1139 } 1140 1141 /** 1142 * bond_change_active_slave - change the active slave into the specified one 1143 * @bond: our bonding struct 1144 * @new_active: the new slave to make the active one 1145 * 1146 * Set the new slave to the bond's settings and unset them on the old 1147 * curr_active_slave. 1148 * Setting include flags, mc-list, promiscuity, allmulti, etc. 1149 * 1150 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, 1151 * because it is apparently the best available slave we have, even though its 1152 * updelay hasn't timed out yet. 1153 * 1154 * Caller must hold RTNL. 1155 */ 1156 void bond_change_active_slave(struct bonding *bond, struct slave *new_active) 1157 { 1158 struct slave *old_active; 1159 1160 ASSERT_RTNL(); 1161 1162 old_active = rtnl_dereference(bond->curr_active_slave); 1163 1164 if (old_active == new_active) 1165 return; 1166 1167 #ifdef CONFIG_XFRM_OFFLOAD 1168 bond_ipsec_del_sa_all(bond); 1169 #endif /* CONFIG_XFRM_OFFLOAD */ 1170 1171 if (new_active) { 1172 new_active->last_link_up = jiffies; 1173 1174 if (new_active->link == BOND_LINK_BACK) { 1175 if (bond_uses_primary(bond)) { 1176 slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n", 1177 (bond->params.updelay - new_active->delay) * bond->params.miimon); 1178 } 1179 1180 new_active->delay = 0; 1181 bond_set_slave_link_state(new_active, BOND_LINK_UP, 1182 BOND_SLAVE_NOTIFY_NOW); 1183 1184 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1185 bond_3ad_handle_link_change(new_active, BOND_LINK_UP); 1186 1187 if (bond_is_lb(bond)) 1188 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); 1189 } else { 1190 if (bond_uses_primary(bond)) 1191 slave_info(bond->dev, new_active->dev, "making interface the new active one\n"); 1192 } 1193 } 1194 1195 if (bond_uses_primary(bond)) 1196 bond_hw_addr_swap(bond, new_active, old_active); 1197 1198 if (bond_is_lb(bond)) { 1199 bond_alb_handle_active_change(bond, new_active); 1200 if (old_active) 1201 bond_set_slave_inactive_flags(old_active, 1202 BOND_SLAVE_NOTIFY_NOW); 1203 if (new_active) 1204 bond_set_slave_active_flags(new_active, 1205 BOND_SLAVE_NOTIFY_NOW); 1206 } else { 1207 rcu_assign_pointer(bond->curr_active_slave, new_active); 1208 } 1209 1210 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) { 1211 if (old_active) 1212 bond_set_slave_inactive_flags(old_active, 1213 BOND_SLAVE_NOTIFY_NOW); 1214 1215 if (new_active) { 1216 bool should_notify_peers = false; 1217 1218 bond_set_slave_active_flags(new_active, 1219 BOND_SLAVE_NOTIFY_NOW); 1220 1221 if (bond->params.fail_over_mac) 1222 bond_do_fail_over_mac(bond, new_active, 1223 old_active); 1224 1225 if (netif_running(bond->dev)) { 1226 bond->send_peer_notif = 1227 bond->params.num_peer_notif * 1228 max(1, bond->params.peer_notif_delay); 1229 should_notify_peers = 1230 bond_should_notify_peers(bond); 1231 } 1232 1233 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev); 1234 if (should_notify_peers) { 1235 bond->send_peer_notif--; 1236 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 1237 bond->dev); 1238 } 1239 } 1240 } 1241 1242 #ifdef CONFIG_XFRM_OFFLOAD 1243 bond_ipsec_add_sa_all(bond); 1244 #endif /* CONFIG_XFRM_OFFLOAD */ 1245 1246 /* resend IGMP joins since active slave has changed or 1247 * all were sent on curr_active_slave. 1248 * resend only if bond is brought up with the affected 1249 * bonding modes and the retransmission is enabled 1250 */ 1251 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && 1252 ((bond_uses_primary(bond) && new_active) || 1253 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) { 1254 bond->igmp_retrans = bond->params.resend_igmp; 1255 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 1256 } 1257 } 1258 1259 /** 1260 * bond_select_active_slave - select a new active slave, if needed 1261 * @bond: our bonding struct 1262 * 1263 * This functions should be called when one of the following occurs: 1264 * - The old curr_active_slave has been released or lost its link. 1265 * - The primary_slave has got its link back. 1266 * - A slave has got its link back and there's no old curr_active_slave. 1267 * 1268 * Caller must hold RTNL. 1269 */ 1270 void bond_select_active_slave(struct bonding *bond) 1271 { 1272 struct slave *best_slave; 1273 int rv; 1274 1275 ASSERT_RTNL(); 1276 1277 best_slave = bond_find_best_slave(bond); 1278 if (best_slave != rtnl_dereference(bond->curr_active_slave)) { 1279 bond_change_active_slave(bond, best_slave); 1280 rv = bond_set_carrier(bond); 1281 if (!rv) 1282 return; 1283 1284 if (netif_carrier_ok(bond->dev)) 1285 netdev_info(bond->dev, "active interface up!\n"); 1286 else 1287 netdev_info(bond->dev, "now running without any active interface!\n"); 1288 } 1289 } 1290 1291 #ifdef CONFIG_NET_POLL_CONTROLLER 1292 static inline int slave_enable_netpoll(struct slave *slave) 1293 { 1294 struct netpoll *np; 1295 int err = 0; 1296 1297 np = kzalloc(sizeof(*np), GFP_KERNEL); 1298 err = -ENOMEM; 1299 if (!np) 1300 goto out; 1301 1302 err = __netpoll_setup(np, slave->dev); 1303 if (err) { 1304 kfree(np); 1305 goto out; 1306 } 1307 slave->np = np; 1308 out: 1309 return err; 1310 } 1311 static inline void slave_disable_netpoll(struct slave *slave) 1312 { 1313 struct netpoll *np = slave->np; 1314 1315 if (!np) 1316 return; 1317 1318 slave->np = NULL; 1319 1320 __netpoll_free(np); 1321 } 1322 1323 static void bond_poll_controller(struct net_device *bond_dev) 1324 { 1325 struct bonding *bond = netdev_priv(bond_dev); 1326 struct slave *slave = NULL; 1327 struct list_head *iter; 1328 struct ad_info ad_info; 1329 1330 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1331 if (bond_3ad_get_active_agg_info(bond, &ad_info)) 1332 return; 1333 1334 bond_for_each_slave_rcu(bond, slave, iter) { 1335 if (!bond_slave_is_up(slave)) 1336 continue; 1337 1338 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1339 struct aggregator *agg = 1340 SLAVE_AD_INFO(slave)->port.aggregator; 1341 1342 if (agg && 1343 agg->aggregator_identifier != ad_info.aggregator_id) 1344 continue; 1345 } 1346 1347 netpoll_poll_dev(slave->dev); 1348 } 1349 } 1350 1351 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1352 { 1353 struct bonding *bond = netdev_priv(bond_dev); 1354 struct list_head *iter; 1355 struct slave *slave; 1356 1357 bond_for_each_slave(bond, slave, iter) 1358 if (bond_slave_is_up(slave)) 1359 slave_disable_netpoll(slave); 1360 } 1361 1362 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) 1363 { 1364 struct bonding *bond = netdev_priv(dev); 1365 struct list_head *iter; 1366 struct slave *slave; 1367 int err = 0; 1368 1369 bond_for_each_slave(bond, slave, iter) { 1370 err = slave_enable_netpoll(slave); 1371 if (err) { 1372 bond_netpoll_cleanup(dev); 1373 break; 1374 } 1375 } 1376 return err; 1377 } 1378 #else 1379 static inline int slave_enable_netpoll(struct slave *slave) 1380 { 1381 return 0; 1382 } 1383 static inline void slave_disable_netpoll(struct slave *slave) 1384 { 1385 } 1386 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1387 { 1388 } 1389 #endif 1390 1391 /*---------------------------------- IOCTL ----------------------------------*/ 1392 1393 static netdev_features_t bond_fix_features(struct net_device *dev, 1394 netdev_features_t features) 1395 { 1396 struct bonding *bond = netdev_priv(dev); 1397 struct list_head *iter; 1398 netdev_features_t mask; 1399 struct slave *slave; 1400 1401 #if IS_ENABLED(CONFIG_TLS_DEVICE) 1402 if (bond_sk_check(bond)) 1403 features |= BOND_TLS_FEATURES; 1404 else 1405 features &= ~BOND_TLS_FEATURES; 1406 #endif 1407 1408 mask = features; 1409 1410 features &= ~NETIF_F_ONE_FOR_ALL; 1411 features |= NETIF_F_ALL_FOR_ALL; 1412 1413 bond_for_each_slave(bond, slave, iter) { 1414 features = netdev_increment_features(features, 1415 slave->dev->features, 1416 mask); 1417 } 1418 features = netdev_add_tso_features(features, mask); 1419 1420 return features; 1421 } 1422 1423 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1424 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | \ 1425 NETIF_F_HIGHDMA | NETIF_F_LRO) 1426 1427 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1428 NETIF_F_RXCSUM | NETIF_F_GSO_SOFTWARE) 1429 1430 #define BOND_MPLS_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1431 NETIF_F_GSO_SOFTWARE) 1432 1433 1434 static void bond_compute_features(struct bonding *bond) 1435 { 1436 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE | 1437 IFF_XMIT_DST_RELEASE_PERM; 1438 netdev_features_t vlan_features = BOND_VLAN_FEATURES; 1439 netdev_features_t enc_features = BOND_ENC_FEATURES; 1440 #ifdef CONFIG_XFRM_OFFLOAD 1441 netdev_features_t xfrm_features = BOND_XFRM_FEATURES; 1442 #endif /* CONFIG_XFRM_OFFLOAD */ 1443 netdev_features_t mpls_features = BOND_MPLS_FEATURES; 1444 struct net_device *bond_dev = bond->dev; 1445 struct list_head *iter; 1446 struct slave *slave; 1447 unsigned short max_hard_header_len = ETH_HLEN; 1448 unsigned int tso_max_size = TSO_MAX_SIZE; 1449 u16 tso_max_segs = TSO_MAX_SEGS; 1450 1451 if (!bond_has_slaves(bond)) 1452 goto done; 1453 vlan_features &= NETIF_F_ALL_FOR_ALL; 1454 mpls_features &= NETIF_F_ALL_FOR_ALL; 1455 1456 bond_for_each_slave(bond, slave, iter) { 1457 vlan_features = netdev_increment_features(vlan_features, 1458 slave->dev->vlan_features, BOND_VLAN_FEATURES); 1459 1460 enc_features = netdev_increment_features(enc_features, 1461 slave->dev->hw_enc_features, 1462 BOND_ENC_FEATURES); 1463 1464 #ifdef CONFIG_XFRM_OFFLOAD 1465 xfrm_features = netdev_increment_features(xfrm_features, 1466 slave->dev->hw_enc_features, 1467 BOND_XFRM_FEATURES); 1468 #endif /* CONFIG_XFRM_OFFLOAD */ 1469 1470 mpls_features = netdev_increment_features(mpls_features, 1471 slave->dev->mpls_features, 1472 BOND_MPLS_FEATURES); 1473 1474 dst_release_flag &= slave->dev->priv_flags; 1475 if (slave->dev->hard_header_len > max_hard_header_len) 1476 max_hard_header_len = slave->dev->hard_header_len; 1477 1478 tso_max_size = min(tso_max_size, slave->dev->tso_max_size); 1479 tso_max_segs = min(tso_max_segs, slave->dev->tso_max_segs); 1480 } 1481 bond_dev->hard_header_len = max_hard_header_len; 1482 1483 done: 1484 bond_dev->vlan_features = vlan_features; 1485 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL | 1486 NETIF_F_HW_VLAN_CTAG_TX | 1487 NETIF_F_HW_VLAN_STAG_TX; 1488 #ifdef CONFIG_XFRM_OFFLOAD 1489 bond_dev->hw_enc_features |= xfrm_features; 1490 #endif /* CONFIG_XFRM_OFFLOAD */ 1491 bond_dev->mpls_features = mpls_features; 1492 netif_set_tso_max_segs(bond_dev, tso_max_segs); 1493 netif_set_tso_max_size(bond_dev, tso_max_size); 1494 1495 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1496 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) && 1497 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM)) 1498 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE; 1499 1500 netdev_change_features(bond_dev); 1501 } 1502 1503 static void bond_setup_by_slave(struct net_device *bond_dev, 1504 struct net_device *slave_dev) 1505 { 1506 bond_dev->header_ops = slave_dev->header_ops; 1507 1508 bond_dev->type = slave_dev->type; 1509 bond_dev->hard_header_len = slave_dev->hard_header_len; 1510 bond_dev->needed_headroom = slave_dev->needed_headroom; 1511 bond_dev->addr_len = slave_dev->addr_len; 1512 1513 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1514 slave_dev->addr_len); 1515 } 1516 1517 /* On bonding slaves other than the currently active slave, suppress 1518 * duplicates except for alb non-mcast/bcast. 1519 */ 1520 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1521 struct slave *slave, 1522 struct bonding *bond) 1523 { 1524 if (bond_is_slave_inactive(slave)) { 1525 if (BOND_MODE(bond) == BOND_MODE_ALB && 1526 skb->pkt_type != PACKET_BROADCAST && 1527 skb->pkt_type != PACKET_MULTICAST) 1528 return false; 1529 return true; 1530 } 1531 return false; 1532 } 1533 1534 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1535 { 1536 struct sk_buff *skb = *pskb; 1537 struct slave *slave; 1538 struct bonding *bond; 1539 int (*recv_probe)(const struct sk_buff *, struct bonding *, 1540 struct slave *); 1541 int ret = RX_HANDLER_ANOTHER; 1542 1543 skb = skb_share_check(skb, GFP_ATOMIC); 1544 if (unlikely(!skb)) 1545 return RX_HANDLER_CONSUMED; 1546 1547 *pskb = skb; 1548 1549 slave = bond_slave_get_rcu(skb->dev); 1550 bond = slave->bond; 1551 1552 recv_probe = READ_ONCE(bond->recv_probe); 1553 if (recv_probe) { 1554 ret = recv_probe(skb, bond, slave); 1555 if (ret == RX_HANDLER_CONSUMED) { 1556 consume_skb(skb); 1557 return ret; 1558 } 1559 } 1560 1561 /* 1562 * For packets determined by bond_should_deliver_exact_match() call to 1563 * be suppressed we want to make an exception for link-local packets. 1564 * This is necessary for e.g. LLDP daemons to be able to monitor 1565 * inactive slave links without being forced to bind to them 1566 * explicitly. 1567 * 1568 * At the same time, packets that are passed to the bonding master 1569 * (including link-local ones) can have their originating interface 1570 * determined via PACKET_ORIGDEV socket option. 1571 */ 1572 if (bond_should_deliver_exact_match(skb, slave, bond)) { 1573 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest)) 1574 return RX_HANDLER_PASS; 1575 return RX_HANDLER_EXACT; 1576 } 1577 1578 skb->dev = bond->dev; 1579 1580 if (BOND_MODE(bond) == BOND_MODE_ALB && 1581 netif_is_bridge_port(bond->dev) && 1582 skb->pkt_type == PACKET_HOST) { 1583 1584 if (unlikely(skb_cow_head(skb, 1585 skb->data - skb_mac_header(skb)))) { 1586 kfree_skb(skb); 1587 return RX_HANDLER_CONSUMED; 1588 } 1589 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, 1590 bond->dev->addr_len); 1591 } 1592 1593 return ret; 1594 } 1595 1596 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond) 1597 { 1598 switch (BOND_MODE(bond)) { 1599 case BOND_MODE_ROUNDROBIN: 1600 return NETDEV_LAG_TX_TYPE_ROUNDROBIN; 1601 case BOND_MODE_ACTIVEBACKUP: 1602 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP; 1603 case BOND_MODE_BROADCAST: 1604 return NETDEV_LAG_TX_TYPE_BROADCAST; 1605 case BOND_MODE_XOR: 1606 case BOND_MODE_8023AD: 1607 return NETDEV_LAG_TX_TYPE_HASH; 1608 default: 1609 return NETDEV_LAG_TX_TYPE_UNKNOWN; 1610 } 1611 } 1612 1613 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond, 1614 enum netdev_lag_tx_type type) 1615 { 1616 if (type != NETDEV_LAG_TX_TYPE_HASH) 1617 return NETDEV_LAG_HASH_NONE; 1618 1619 switch (bond->params.xmit_policy) { 1620 case BOND_XMIT_POLICY_LAYER2: 1621 return NETDEV_LAG_HASH_L2; 1622 case BOND_XMIT_POLICY_LAYER34: 1623 return NETDEV_LAG_HASH_L34; 1624 case BOND_XMIT_POLICY_LAYER23: 1625 return NETDEV_LAG_HASH_L23; 1626 case BOND_XMIT_POLICY_ENCAP23: 1627 return NETDEV_LAG_HASH_E23; 1628 case BOND_XMIT_POLICY_ENCAP34: 1629 return NETDEV_LAG_HASH_E34; 1630 case BOND_XMIT_POLICY_VLAN_SRCMAC: 1631 return NETDEV_LAG_HASH_VLAN_SRCMAC; 1632 default: 1633 return NETDEV_LAG_HASH_UNKNOWN; 1634 } 1635 } 1636 1637 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave, 1638 struct netlink_ext_ack *extack) 1639 { 1640 struct netdev_lag_upper_info lag_upper_info; 1641 enum netdev_lag_tx_type type; 1642 1643 type = bond_lag_tx_type(bond); 1644 lag_upper_info.tx_type = type; 1645 lag_upper_info.hash_type = bond_lag_hash_type(bond, type); 1646 1647 return netdev_master_upper_dev_link(slave->dev, bond->dev, slave, 1648 &lag_upper_info, extack); 1649 } 1650 1651 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave) 1652 { 1653 netdev_upper_dev_unlink(slave->dev, bond->dev); 1654 slave->dev->flags &= ~IFF_SLAVE; 1655 } 1656 1657 static void slave_kobj_release(struct kobject *kobj) 1658 { 1659 struct slave *slave = to_slave(kobj); 1660 struct bonding *bond = bond_get_bond_by_slave(slave); 1661 1662 cancel_delayed_work_sync(&slave->notify_work); 1663 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1664 kfree(SLAVE_AD_INFO(slave)); 1665 1666 kfree(slave); 1667 } 1668 1669 static struct kobj_type slave_ktype = { 1670 .release = slave_kobj_release, 1671 #ifdef CONFIG_SYSFS 1672 .sysfs_ops = &slave_sysfs_ops, 1673 #endif 1674 }; 1675 1676 static int bond_kobj_init(struct slave *slave) 1677 { 1678 int err; 1679 1680 err = kobject_init_and_add(&slave->kobj, &slave_ktype, 1681 &(slave->dev->dev.kobj), "bonding_slave"); 1682 if (err) 1683 kobject_put(&slave->kobj); 1684 1685 return err; 1686 } 1687 1688 static struct slave *bond_alloc_slave(struct bonding *bond, 1689 struct net_device *slave_dev) 1690 { 1691 struct slave *slave = NULL; 1692 1693 slave = kzalloc(sizeof(*slave), GFP_KERNEL); 1694 if (!slave) 1695 return NULL; 1696 1697 slave->bond = bond; 1698 slave->dev = slave_dev; 1699 INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work); 1700 1701 if (bond_kobj_init(slave)) 1702 return NULL; 1703 1704 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1705 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info), 1706 GFP_KERNEL); 1707 if (!SLAVE_AD_INFO(slave)) { 1708 kobject_put(&slave->kobj); 1709 return NULL; 1710 } 1711 } 1712 1713 return slave; 1714 } 1715 1716 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info) 1717 { 1718 info->bond_mode = BOND_MODE(bond); 1719 info->miimon = bond->params.miimon; 1720 info->num_slaves = bond->slave_cnt; 1721 } 1722 1723 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info) 1724 { 1725 strcpy(info->slave_name, slave->dev->name); 1726 info->link = slave->link; 1727 info->state = bond_slave_state(slave); 1728 info->link_failure_count = slave->link_failure_count; 1729 } 1730 1731 static void bond_netdev_notify_work(struct work_struct *_work) 1732 { 1733 struct slave *slave = container_of(_work, struct slave, 1734 notify_work.work); 1735 1736 if (rtnl_trylock()) { 1737 struct netdev_bonding_info binfo; 1738 1739 bond_fill_ifslave(slave, &binfo.slave); 1740 bond_fill_ifbond(slave->bond, &binfo.master); 1741 netdev_bonding_info_change(slave->dev, &binfo); 1742 rtnl_unlock(); 1743 } else { 1744 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1); 1745 } 1746 } 1747 1748 void bond_queue_slave_event(struct slave *slave) 1749 { 1750 queue_delayed_work(slave->bond->wq, &slave->notify_work, 0); 1751 } 1752 1753 void bond_lower_state_changed(struct slave *slave) 1754 { 1755 struct netdev_lag_lower_state_info info; 1756 1757 info.link_up = slave->link == BOND_LINK_UP || 1758 slave->link == BOND_LINK_FAIL; 1759 info.tx_enabled = bond_is_active_slave(slave); 1760 netdev_lower_state_changed(slave->dev, &info); 1761 } 1762 1763 #define BOND_NL_ERR(bond_dev, extack, errmsg) do { \ 1764 if (extack) \ 1765 NL_SET_ERR_MSG(extack, errmsg); \ 1766 else \ 1767 netdev_err(bond_dev, "Error: %s\n", errmsg); \ 1768 } while (0) 1769 1770 #define SLAVE_NL_ERR(bond_dev, slave_dev, extack, errmsg) do { \ 1771 if (extack) \ 1772 NL_SET_ERR_MSG(extack, errmsg); \ 1773 else \ 1774 slave_err(bond_dev, slave_dev, "Error: %s\n", errmsg); \ 1775 } while (0) 1776 1777 /* enslave device <slave> to bond device <master> */ 1778 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev, 1779 struct netlink_ext_ack *extack) 1780 { 1781 struct bonding *bond = netdev_priv(bond_dev); 1782 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1783 struct slave *new_slave = NULL, *prev_slave; 1784 struct sockaddr_storage ss; 1785 int link_reporting; 1786 int res = 0, i; 1787 1788 if (slave_dev->flags & IFF_MASTER && 1789 !netif_is_bond_master(slave_dev)) { 1790 BOND_NL_ERR(bond_dev, extack, 1791 "Device type (master device) cannot be enslaved"); 1792 return -EPERM; 1793 } 1794 1795 if (!bond->params.use_carrier && 1796 slave_dev->ethtool_ops->get_link == NULL && 1797 slave_ops->ndo_eth_ioctl == NULL) { 1798 slave_warn(bond_dev, slave_dev, "no link monitoring support\n"); 1799 } 1800 1801 /* already in-use? */ 1802 if (netdev_is_rx_handler_busy(slave_dev)) { 1803 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1804 "Device is in use and cannot be enslaved"); 1805 return -EBUSY; 1806 } 1807 1808 if (bond_dev == slave_dev) { 1809 BOND_NL_ERR(bond_dev, extack, "Cannot enslave bond to itself."); 1810 return -EPERM; 1811 } 1812 1813 /* vlan challenged mutual exclusion */ 1814 /* no need to lock since we're protected by rtnl_lock */ 1815 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1816 slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n"); 1817 if (vlan_uses_dev(bond_dev)) { 1818 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1819 "Can not enslave VLAN challenged device to VLAN enabled bond"); 1820 return -EPERM; 1821 } else { 1822 slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n"); 1823 } 1824 } else { 1825 slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n"); 1826 } 1827 1828 if (slave_dev->features & NETIF_F_HW_ESP) 1829 slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n"); 1830 1831 /* Old ifenslave binaries are no longer supported. These can 1832 * be identified with moderate accuracy by the state of the slave: 1833 * the current ifenslave will set the interface down prior to 1834 * enslaving it; the old ifenslave will not. 1835 */ 1836 if (slave_dev->flags & IFF_UP) { 1837 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1838 "Device can not be enslaved while up"); 1839 return -EPERM; 1840 } 1841 1842 /* set bonding device ether type by slave - bonding netdevices are 1843 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1844 * there is a need to override some of the type dependent attribs/funcs. 1845 * 1846 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1847 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1848 */ 1849 if (!bond_has_slaves(bond)) { 1850 if (bond_dev->type != slave_dev->type) { 1851 slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n", 1852 bond_dev->type, slave_dev->type); 1853 1854 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, 1855 bond_dev); 1856 res = notifier_to_errno(res); 1857 if (res) { 1858 slave_err(bond_dev, slave_dev, "refused to change device type\n"); 1859 return -EBUSY; 1860 } 1861 1862 /* Flush unicast and multicast addresses */ 1863 dev_uc_flush(bond_dev); 1864 dev_mc_flush(bond_dev); 1865 1866 if (slave_dev->type != ARPHRD_ETHER) 1867 bond_setup_by_slave(bond_dev, slave_dev); 1868 else { 1869 ether_setup(bond_dev); 1870 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1871 } 1872 1873 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, 1874 bond_dev); 1875 } 1876 } else if (bond_dev->type != slave_dev->type) { 1877 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1878 "Device type is different from other slaves"); 1879 return -EINVAL; 1880 } 1881 1882 if (slave_dev->type == ARPHRD_INFINIBAND && 1883 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1884 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1885 "Only active-backup mode is supported for infiniband slaves"); 1886 res = -EOPNOTSUPP; 1887 goto err_undo_flags; 1888 } 1889 1890 if (!slave_ops->ndo_set_mac_address || 1891 slave_dev->type == ARPHRD_INFINIBAND) { 1892 slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n"); 1893 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP && 1894 bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1895 if (!bond_has_slaves(bond)) { 1896 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1897 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n"); 1898 } else { 1899 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1900 "Slave device does not support setting the MAC address, but fail_over_mac is not set to active"); 1901 res = -EOPNOTSUPP; 1902 goto err_undo_flags; 1903 } 1904 } 1905 } 1906 1907 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1908 1909 /* If this is the first slave, then we need to set the master's hardware 1910 * address to be the same as the slave's. 1911 */ 1912 if (!bond_has_slaves(bond) && 1913 bond->dev->addr_assign_type == NET_ADDR_RANDOM) { 1914 res = bond_set_dev_addr(bond->dev, slave_dev); 1915 if (res) 1916 goto err_undo_flags; 1917 } 1918 1919 new_slave = bond_alloc_slave(bond, slave_dev); 1920 if (!new_slave) { 1921 res = -ENOMEM; 1922 goto err_undo_flags; 1923 } 1924 1925 /* Set the new_slave's queue_id to be zero. Queue ID mapping 1926 * is set via sysfs or module option if desired. 1927 */ 1928 new_slave->queue_id = 0; 1929 1930 /* Save slave's original mtu and then set it to match the bond */ 1931 new_slave->original_mtu = slave_dev->mtu; 1932 res = dev_set_mtu(slave_dev, bond->dev->mtu); 1933 if (res) { 1934 slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res); 1935 goto err_free; 1936 } 1937 1938 /* Save slave's original ("permanent") mac address for modes 1939 * that need it, and for restoring it upon release, and then 1940 * set it to the master's address 1941 */ 1942 bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr, 1943 slave_dev->addr_len); 1944 1945 if (!bond->params.fail_over_mac || 1946 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1947 /* Set slave to master's mac address. The application already 1948 * set the master's mac address to that of the first slave 1949 */ 1950 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 1951 ss.ss_family = slave_dev->type; 1952 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, 1953 extack); 1954 if (res) { 1955 slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res); 1956 goto err_restore_mtu; 1957 } 1958 } 1959 1960 /* set slave flag before open to prevent IPv6 addrconf */ 1961 slave_dev->flags |= IFF_SLAVE; 1962 1963 /* open the slave since the application closed it */ 1964 res = dev_open(slave_dev, extack); 1965 if (res) { 1966 slave_err(bond_dev, slave_dev, "Opening slave failed\n"); 1967 goto err_restore_mac; 1968 } 1969 1970 slave_dev->priv_flags |= IFF_BONDING; 1971 /* initialize slave stats */ 1972 dev_get_stats(new_slave->dev, &new_slave->slave_stats); 1973 1974 if (bond_is_lb(bond)) { 1975 /* bond_alb_init_slave() must be called before all other stages since 1976 * it might fail and we do not want to have to undo everything 1977 */ 1978 res = bond_alb_init_slave(bond, new_slave); 1979 if (res) 1980 goto err_close; 1981 } 1982 1983 res = vlan_vids_add_by_dev(slave_dev, bond_dev); 1984 if (res) { 1985 slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n"); 1986 goto err_close; 1987 } 1988 1989 prev_slave = bond_last_slave(bond); 1990 1991 new_slave->delay = 0; 1992 new_slave->link_failure_count = 0; 1993 1994 if (bond_update_speed_duplex(new_slave) && 1995 bond_needs_speed_duplex(bond)) 1996 new_slave->link = BOND_LINK_DOWN; 1997 1998 new_slave->last_rx = jiffies - 1999 (msecs_to_jiffies(bond->params.arp_interval) + 1); 2000 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) 2001 new_slave->target_last_arp_rx[i] = new_slave->last_rx; 2002 2003 new_slave->last_tx = new_slave->last_rx; 2004 2005 if (bond->params.miimon && !bond->params.use_carrier) { 2006 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 2007 2008 if ((link_reporting == -1) && !bond->params.arp_interval) { 2009 /* miimon is set but a bonded network driver 2010 * does not support ETHTOOL/MII and 2011 * arp_interval is not set. Note: if 2012 * use_carrier is enabled, we will never go 2013 * here (because netif_carrier is always 2014 * supported); thus, we don't need to change 2015 * the messages for netif_carrier. 2016 */ 2017 slave_warn(bond_dev, slave_dev, "MII and ETHTOOL support not available for slave, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n"); 2018 } else if (link_reporting == -1) { 2019 /* unable get link status using mii/ethtool */ 2020 slave_warn(bond_dev, slave_dev, "can't get link status from slave; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface\n"); 2021 } 2022 } 2023 2024 /* check for initial state */ 2025 new_slave->link = BOND_LINK_NOCHANGE; 2026 if (bond->params.miimon) { 2027 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { 2028 if (bond->params.updelay) { 2029 bond_set_slave_link_state(new_slave, 2030 BOND_LINK_BACK, 2031 BOND_SLAVE_NOTIFY_NOW); 2032 new_slave->delay = bond->params.updelay; 2033 } else { 2034 bond_set_slave_link_state(new_slave, 2035 BOND_LINK_UP, 2036 BOND_SLAVE_NOTIFY_NOW); 2037 } 2038 } else { 2039 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN, 2040 BOND_SLAVE_NOTIFY_NOW); 2041 } 2042 } else if (bond->params.arp_interval) { 2043 bond_set_slave_link_state(new_slave, 2044 (netif_carrier_ok(slave_dev) ? 2045 BOND_LINK_UP : BOND_LINK_DOWN), 2046 BOND_SLAVE_NOTIFY_NOW); 2047 } else { 2048 bond_set_slave_link_state(new_slave, BOND_LINK_UP, 2049 BOND_SLAVE_NOTIFY_NOW); 2050 } 2051 2052 if (new_slave->link != BOND_LINK_DOWN) 2053 new_slave->last_link_up = jiffies; 2054 slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n", 2055 new_slave->link == BOND_LINK_DOWN ? "DOWN" : 2056 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); 2057 2058 if (bond_uses_primary(bond) && bond->params.primary[0]) { 2059 /* if there is a primary slave, remember it */ 2060 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 2061 rcu_assign_pointer(bond->primary_slave, new_slave); 2062 bond->force_primary = true; 2063 } 2064 } 2065 2066 switch (BOND_MODE(bond)) { 2067 case BOND_MODE_ACTIVEBACKUP: 2068 bond_set_slave_inactive_flags(new_slave, 2069 BOND_SLAVE_NOTIFY_NOW); 2070 break; 2071 case BOND_MODE_8023AD: 2072 /* in 802.3ad mode, the internal mechanism 2073 * will activate the slaves in the selected 2074 * aggregator 2075 */ 2076 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 2077 /* if this is the first slave */ 2078 if (!prev_slave) { 2079 SLAVE_AD_INFO(new_slave)->id = 1; 2080 /* Initialize AD with the number of times that the AD timer is called in 1 second 2081 * can be called only after the mac address of the bond is set 2082 */ 2083 bond_3ad_initialize(bond); 2084 } else { 2085 SLAVE_AD_INFO(new_slave)->id = 2086 SLAVE_AD_INFO(prev_slave)->id + 1; 2087 } 2088 2089 bond_3ad_bind_slave(new_slave); 2090 break; 2091 case BOND_MODE_TLB: 2092 case BOND_MODE_ALB: 2093 bond_set_active_slave(new_slave); 2094 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 2095 break; 2096 default: 2097 slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n"); 2098 2099 /* always active in trunk mode */ 2100 bond_set_active_slave(new_slave); 2101 2102 /* In trunking mode there is little meaning to curr_active_slave 2103 * anyway (it holds no special properties of the bond device), 2104 * so we can change it without calling change_active_interface() 2105 */ 2106 if (!rcu_access_pointer(bond->curr_active_slave) && 2107 new_slave->link == BOND_LINK_UP) 2108 rcu_assign_pointer(bond->curr_active_slave, new_slave); 2109 2110 break; 2111 } /* switch(bond_mode) */ 2112 2113 #ifdef CONFIG_NET_POLL_CONTROLLER 2114 if (bond->dev->npinfo) { 2115 if (slave_enable_netpoll(new_slave)) { 2116 slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n"); 2117 res = -EBUSY; 2118 goto err_detach; 2119 } 2120 } 2121 #endif 2122 2123 if (!(bond_dev->features & NETIF_F_LRO)) 2124 dev_disable_lro(slave_dev); 2125 2126 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 2127 new_slave); 2128 if (res) { 2129 slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res); 2130 goto err_detach; 2131 } 2132 2133 res = bond_master_upper_dev_link(bond, new_slave, extack); 2134 if (res) { 2135 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res); 2136 goto err_unregister; 2137 } 2138 2139 bond_lower_state_changed(new_slave); 2140 2141 res = bond_sysfs_slave_add(new_slave); 2142 if (res) { 2143 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res); 2144 goto err_upper_unlink; 2145 } 2146 2147 /* If the mode uses primary, then the following is handled by 2148 * bond_change_active_slave(). 2149 */ 2150 if (!bond_uses_primary(bond)) { 2151 /* set promiscuity level to new slave */ 2152 if (bond_dev->flags & IFF_PROMISC) { 2153 res = dev_set_promiscuity(slave_dev, 1); 2154 if (res) 2155 goto err_sysfs_del; 2156 } 2157 2158 /* set allmulti level to new slave */ 2159 if (bond_dev->flags & IFF_ALLMULTI) { 2160 res = dev_set_allmulti(slave_dev, 1); 2161 if (res) { 2162 if (bond_dev->flags & IFF_PROMISC) 2163 dev_set_promiscuity(slave_dev, -1); 2164 goto err_sysfs_del; 2165 } 2166 } 2167 2168 if (bond_dev->flags & IFF_UP) { 2169 netif_addr_lock_bh(bond_dev); 2170 dev_mc_sync_multiple(slave_dev, bond_dev); 2171 dev_uc_sync_multiple(slave_dev, bond_dev); 2172 netif_addr_unlock_bh(bond_dev); 2173 2174 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2175 dev_mc_add(slave_dev, lacpdu_mcast_addr); 2176 } 2177 } 2178 2179 bond->slave_cnt++; 2180 bond_compute_features(bond); 2181 bond_set_carrier(bond); 2182 2183 if (bond_uses_primary(bond)) { 2184 block_netpoll_tx(); 2185 bond_select_active_slave(bond); 2186 unblock_netpoll_tx(); 2187 } 2188 2189 if (bond_mode_can_use_xmit_hash(bond)) 2190 bond_update_slave_arr(bond, NULL); 2191 2192 2193 if (!slave_dev->netdev_ops->ndo_bpf || 2194 !slave_dev->netdev_ops->ndo_xdp_xmit) { 2195 if (bond->xdp_prog) { 2196 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 2197 "Slave does not support XDP"); 2198 res = -EOPNOTSUPP; 2199 goto err_sysfs_del; 2200 } 2201 } else if (bond->xdp_prog) { 2202 struct netdev_bpf xdp = { 2203 .command = XDP_SETUP_PROG, 2204 .flags = 0, 2205 .prog = bond->xdp_prog, 2206 .extack = extack, 2207 }; 2208 2209 if (dev_xdp_prog_count(slave_dev) > 0) { 2210 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 2211 "Slave has XDP program loaded, please unload before enslaving"); 2212 res = -EOPNOTSUPP; 2213 goto err_sysfs_del; 2214 } 2215 2216 res = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 2217 if (res < 0) { 2218 /* ndo_bpf() sets extack error message */ 2219 slave_dbg(bond_dev, slave_dev, "Error %d calling ndo_bpf\n", res); 2220 goto err_sysfs_del; 2221 } 2222 if (bond->xdp_prog) 2223 bpf_prog_inc(bond->xdp_prog); 2224 } 2225 2226 slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n", 2227 bond_is_active_slave(new_slave) ? "an active" : "a backup", 2228 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down"); 2229 2230 /* enslave is successful */ 2231 bond_queue_slave_event(new_slave); 2232 return 0; 2233 2234 /* Undo stages on error */ 2235 err_sysfs_del: 2236 bond_sysfs_slave_del(new_slave); 2237 2238 err_upper_unlink: 2239 bond_upper_dev_unlink(bond, new_slave); 2240 2241 err_unregister: 2242 netdev_rx_handler_unregister(slave_dev); 2243 2244 err_detach: 2245 vlan_vids_del_by_dev(slave_dev, bond_dev); 2246 if (rcu_access_pointer(bond->primary_slave) == new_slave) 2247 RCU_INIT_POINTER(bond->primary_slave, NULL); 2248 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) { 2249 block_netpoll_tx(); 2250 bond_change_active_slave(bond, NULL); 2251 bond_select_active_slave(bond); 2252 unblock_netpoll_tx(); 2253 } 2254 /* either primary_slave or curr_active_slave might've changed */ 2255 synchronize_rcu(); 2256 slave_disable_netpoll(new_slave); 2257 2258 err_close: 2259 if (!netif_is_bond_master(slave_dev)) 2260 slave_dev->priv_flags &= ~IFF_BONDING; 2261 dev_close(slave_dev); 2262 2263 err_restore_mac: 2264 slave_dev->flags &= ~IFF_SLAVE; 2265 if (!bond->params.fail_over_mac || 2266 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2267 /* XXX TODO - fom follow mode needs to change master's 2268 * MAC if this slave's MAC is in use by the bond, or at 2269 * least print a warning. 2270 */ 2271 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr, 2272 new_slave->dev->addr_len); 2273 ss.ss_family = slave_dev->type; 2274 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL); 2275 } 2276 2277 err_restore_mtu: 2278 dev_set_mtu(slave_dev, new_slave->original_mtu); 2279 2280 err_free: 2281 kobject_put(&new_slave->kobj); 2282 2283 err_undo_flags: 2284 /* Enslave of first slave has failed and we need to fix master's mac */ 2285 if (!bond_has_slaves(bond)) { 2286 if (ether_addr_equal_64bits(bond_dev->dev_addr, 2287 slave_dev->dev_addr)) 2288 eth_hw_addr_random(bond_dev); 2289 if (bond_dev->type != ARPHRD_ETHER) { 2290 dev_close(bond_dev); 2291 ether_setup(bond_dev); 2292 bond_dev->flags |= IFF_MASTER; 2293 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 2294 } 2295 } 2296 2297 return res; 2298 } 2299 2300 /* Try to release the slave device <slave> from the bond device <master> 2301 * It is legal to access curr_active_slave without a lock because all the function 2302 * is RTNL-locked. If "all" is true it means that the function is being called 2303 * while destroying a bond interface and all slaves are being released. 2304 * 2305 * The rules for slave state should be: 2306 * for Active/Backup: 2307 * Active stays on all backups go down 2308 * for Bonded connections: 2309 * The first up interface should be left on and all others downed. 2310 */ 2311 static int __bond_release_one(struct net_device *bond_dev, 2312 struct net_device *slave_dev, 2313 bool all, bool unregister) 2314 { 2315 struct bonding *bond = netdev_priv(bond_dev); 2316 struct slave *slave, *oldcurrent; 2317 struct sockaddr_storage ss; 2318 int old_flags = bond_dev->flags; 2319 netdev_features_t old_features = bond_dev->features; 2320 2321 /* slave is not a slave or master is not master of this slave */ 2322 if (!(slave_dev->flags & IFF_SLAVE) || 2323 !netdev_has_upper_dev(slave_dev, bond_dev)) { 2324 slave_dbg(bond_dev, slave_dev, "cannot release slave\n"); 2325 return -EINVAL; 2326 } 2327 2328 block_netpoll_tx(); 2329 2330 slave = bond_get_slave_by_dev(bond, slave_dev); 2331 if (!slave) { 2332 /* not a slave of this bond */ 2333 slave_info(bond_dev, slave_dev, "interface not enslaved\n"); 2334 unblock_netpoll_tx(); 2335 return -EINVAL; 2336 } 2337 2338 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW); 2339 2340 bond_sysfs_slave_del(slave); 2341 2342 /* recompute stats just before removing the slave */ 2343 bond_get_stats(bond->dev, &bond->bond_stats); 2344 2345 if (bond->xdp_prog) { 2346 struct netdev_bpf xdp = { 2347 .command = XDP_SETUP_PROG, 2348 .flags = 0, 2349 .prog = NULL, 2350 .extack = NULL, 2351 }; 2352 if (slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp)) 2353 slave_warn(bond_dev, slave_dev, "failed to unload XDP program\n"); 2354 } 2355 2356 /* unregister rx_handler early so bond_handle_frame wouldn't be called 2357 * for this slave anymore. 2358 */ 2359 netdev_rx_handler_unregister(slave_dev); 2360 2361 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2362 bond_3ad_unbind_slave(slave); 2363 2364 bond_upper_dev_unlink(bond, slave); 2365 2366 if (bond_mode_can_use_xmit_hash(bond)) 2367 bond_update_slave_arr(bond, slave); 2368 2369 slave_info(bond_dev, slave_dev, "Releasing %s interface\n", 2370 bond_is_active_slave(slave) ? "active" : "backup"); 2371 2372 oldcurrent = rcu_access_pointer(bond->curr_active_slave); 2373 2374 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2375 2376 if (!all && (!bond->params.fail_over_mac || 2377 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) { 2378 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) && 2379 bond_has_slaves(bond)) 2380 slave_warn(bond_dev, slave_dev, "the permanent HWaddr of slave - %pM - is still in use by bond - set the HWaddr of slave to a different address to avoid conflicts\n", 2381 slave->perm_hwaddr); 2382 } 2383 2384 if (rtnl_dereference(bond->primary_slave) == slave) 2385 RCU_INIT_POINTER(bond->primary_slave, NULL); 2386 2387 if (oldcurrent == slave) 2388 bond_change_active_slave(bond, NULL); 2389 2390 if (bond_is_lb(bond)) { 2391 /* Must be called only after the slave has been 2392 * detached from the list and the curr_active_slave 2393 * has been cleared (if our_slave == old_current), 2394 * but before a new active slave is selected. 2395 */ 2396 bond_alb_deinit_slave(bond, slave); 2397 } 2398 2399 if (all) { 2400 RCU_INIT_POINTER(bond->curr_active_slave, NULL); 2401 } else if (oldcurrent == slave) { 2402 /* Note that we hold RTNL over this sequence, so there 2403 * is no concern that another slave add/remove event 2404 * will interfere. 2405 */ 2406 bond_select_active_slave(bond); 2407 } 2408 2409 bond_set_carrier(bond); 2410 if (!bond_has_slaves(bond)) 2411 eth_hw_addr_random(bond_dev); 2412 2413 unblock_netpoll_tx(); 2414 synchronize_rcu(); 2415 bond->slave_cnt--; 2416 2417 if (!bond_has_slaves(bond)) { 2418 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 2419 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev); 2420 } 2421 2422 bond_compute_features(bond); 2423 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 2424 (old_features & NETIF_F_VLAN_CHALLENGED)) 2425 slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n"); 2426 2427 vlan_vids_del_by_dev(slave_dev, bond_dev); 2428 2429 /* If the mode uses primary, then this case was handled above by 2430 * bond_change_active_slave(..., NULL) 2431 */ 2432 if (!bond_uses_primary(bond)) { 2433 /* unset promiscuity level from slave 2434 * NOTE: The NETDEV_CHANGEADDR call above may change the value 2435 * of the IFF_PROMISC flag in the bond_dev, but we need the 2436 * value of that flag before that change, as that was the value 2437 * when this slave was attached, so we cache at the start of the 2438 * function and use it here. Same goes for ALLMULTI below 2439 */ 2440 if (old_flags & IFF_PROMISC) 2441 dev_set_promiscuity(slave_dev, -1); 2442 2443 /* unset allmulti level from slave */ 2444 if (old_flags & IFF_ALLMULTI) 2445 dev_set_allmulti(slave_dev, -1); 2446 2447 if (old_flags & IFF_UP) 2448 bond_hw_addr_flush(bond_dev, slave_dev); 2449 } 2450 2451 slave_disable_netpoll(slave); 2452 2453 /* close slave before restoring its mac address */ 2454 dev_close(slave_dev); 2455 2456 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE || 2457 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2458 /* restore original ("permanent") mac address */ 2459 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr, 2460 slave->dev->addr_len); 2461 ss.ss_family = slave_dev->type; 2462 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL); 2463 } 2464 2465 if (unregister) 2466 __dev_set_mtu(slave_dev, slave->original_mtu); 2467 else 2468 dev_set_mtu(slave_dev, slave->original_mtu); 2469 2470 if (!netif_is_bond_master(slave_dev)) 2471 slave_dev->priv_flags &= ~IFF_BONDING; 2472 2473 kobject_put(&slave->kobj); 2474 2475 return 0; 2476 } 2477 2478 /* A wrapper used because of ndo_del_link */ 2479 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 2480 { 2481 return __bond_release_one(bond_dev, slave_dev, false, false); 2482 } 2483 2484 /* First release a slave and then destroy the bond if no more slaves are left. 2485 * Must be under rtnl_lock when this function is called. 2486 */ 2487 static int bond_release_and_destroy(struct net_device *bond_dev, 2488 struct net_device *slave_dev) 2489 { 2490 struct bonding *bond = netdev_priv(bond_dev); 2491 int ret; 2492 2493 ret = __bond_release_one(bond_dev, slave_dev, false, true); 2494 if (ret == 0 && !bond_has_slaves(bond) && 2495 bond_dev->reg_state != NETREG_UNREGISTERING) { 2496 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 2497 netdev_info(bond_dev, "Destroying bond\n"); 2498 bond_remove_proc_entry(bond); 2499 unregister_netdevice(bond_dev); 2500 } 2501 return ret; 2502 } 2503 2504 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info) 2505 { 2506 struct bonding *bond = netdev_priv(bond_dev); 2507 2508 bond_fill_ifbond(bond, info); 2509 } 2510 2511 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 2512 { 2513 struct bonding *bond = netdev_priv(bond_dev); 2514 struct list_head *iter; 2515 int i = 0, res = -ENODEV; 2516 struct slave *slave; 2517 2518 bond_for_each_slave(bond, slave, iter) { 2519 if (i++ == (int)info->slave_id) { 2520 res = 0; 2521 bond_fill_ifslave(slave, info); 2522 break; 2523 } 2524 } 2525 2526 return res; 2527 } 2528 2529 /*-------------------------------- Monitoring -------------------------------*/ 2530 2531 /* called with rcu_read_lock() */ 2532 static int bond_miimon_inspect(struct bonding *bond) 2533 { 2534 int link_state, commit = 0; 2535 struct list_head *iter; 2536 struct slave *slave; 2537 bool ignore_updelay; 2538 2539 ignore_updelay = !rcu_dereference(bond->curr_active_slave); 2540 2541 bond_for_each_slave_rcu(bond, slave, iter) { 2542 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 2543 2544 link_state = bond_check_dev_link(bond, slave->dev, 0); 2545 2546 switch (slave->link) { 2547 case BOND_LINK_UP: 2548 if (link_state) 2549 continue; 2550 2551 bond_propose_link_state(slave, BOND_LINK_FAIL); 2552 commit++; 2553 slave->delay = bond->params.downdelay; 2554 if (slave->delay) { 2555 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n", 2556 (BOND_MODE(bond) == 2557 BOND_MODE_ACTIVEBACKUP) ? 2558 (bond_is_active_slave(slave) ? 2559 "active " : "backup ") : "", 2560 bond->params.downdelay * bond->params.miimon); 2561 } 2562 fallthrough; 2563 case BOND_LINK_FAIL: 2564 if (link_state) { 2565 /* recovered before downdelay expired */ 2566 bond_propose_link_state(slave, BOND_LINK_UP); 2567 slave->last_link_up = jiffies; 2568 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n", 2569 (bond->params.downdelay - slave->delay) * 2570 bond->params.miimon); 2571 commit++; 2572 continue; 2573 } 2574 2575 if (slave->delay <= 0) { 2576 bond_propose_link_state(slave, BOND_LINK_DOWN); 2577 commit++; 2578 continue; 2579 } 2580 2581 slave->delay--; 2582 break; 2583 2584 case BOND_LINK_DOWN: 2585 if (!link_state) 2586 continue; 2587 2588 bond_propose_link_state(slave, BOND_LINK_BACK); 2589 commit++; 2590 slave->delay = bond->params.updelay; 2591 2592 if (slave->delay) { 2593 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n", 2594 ignore_updelay ? 0 : 2595 bond->params.updelay * 2596 bond->params.miimon); 2597 } 2598 fallthrough; 2599 case BOND_LINK_BACK: 2600 if (!link_state) { 2601 bond_propose_link_state(slave, BOND_LINK_DOWN); 2602 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n", 2603 (bond->params.updelay - slave->delay) * 2604 bond->params.miimon); 2605 commit++; 2606 continue; 2607 } 2608 2609 if (ignore_updelay) 2610 slave->delay = 0; 2611 2612 if (slave->delay <= 0) { 2613 bond_propose_link_state(slave, BOND_LINK_UP); 2614 commit++; 2615 ignore_updelay = false; 2616 continue; 2617 } 2618 2619 slave->delay--; 2620 break; 2621 } 2622 } 2623 2624 return commit; 2625 } 2626 2627 static void bond_miimon_link_change(struct bonding *bond, 2628 struct slave *slave, 2629 char link) 2630 { 2631 switch (BOND_MODE(bond)) { 2632 case BOND_MODE_8023AD: 2633 bond_3ad_handle_link_change(slave, link); 2634 break; 2635 case BOND_MODE_TLB: 2636 case BOND_MODE_ALB: 2637 bond_alb_handle_link_change(bond, slave, link); 2638 break; 2639 case BOND_MODE_XOR: 2640 bond_update_slave_arr(bond, NULL); 2641 break; 2642 } 2643 } 2644 2645 static void bond_miimon_commit(struct bonding *bond) 2646 { 2647 struct list_head *iter; 2648 struct slave *slave, *primary; 2649 2650 bond_for_each_slave(bond, slave, iter) { 2651 switch (slave->link_new_state) { 2652 case BOND_LINK_NOCHANGE: 2653 /* For 802.3ad mode, check current slave speed and 2654 * duplex again in case its port was disabled after 2655 * invalid speed/duplex reporting but recovered before 2656 * link monitoring could make a decision on the actual 2657 * link status 2658 */ 2659 if (BOND_MODE(bond) == BOND_MODE_8023AD && 2660 slave->link == BOND_LINK_UP) 2661 bond_3ad_adapter_speed_duplex_changed(slave); 2662 continue; 2663 2664 case BOND_LINK_UP: 2665 if (bond_update_speed_duplex(slave) && 2666 bond_needs_speed_duplex(bond)) { 2667 slave->link = BOND_LINK_DOWN; 2668 if (net_ratelimit()) 2669 slave_warn(bond->dev, slave->dev, 2670 "failed to get link speed/duplex\n"); 2671 continue; 2672 } 2673 bond_set_slave_link_state(slave, BOND_LINK_UP, 2674 BOND_SLAVE_NOTIFY_NOW); 2675 slave->last_link_up = jiffies; 2676 2677 primary = rtnl_dereference(bond->primary_slave); 2678 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 2679 /* prevent it from being the active one */ 2680 bond_set_backup_slave(slave); 2681 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2682 /* make it immediately active */ 2683 bond_set_active_slave(slave); 2684 } 2685 2686 slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n", 2687 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed, 2688 slave->duplex ? "full" : "half"); 2689 2690 bond_miimon_link_change(bond, slave, BOND_LINK_UP); 2691 2692 if (!bond->curr_active_slave || slave == primary) 2693 goto do_failover; 2694 2695 continue; 2696 2697 case BOND_LINK_DOWN: 2698 if (slave->link_failure_count < UINT_MAX) 2699 slave->link_failure_count++; 2700 2701 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2702 BOND_SLAVE_NOTIFY_NOW); 2703 2704 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP || 2705 BOND_MODE(bond) == BOND_MODE_8023AD) 2706 bond_set_slave_inactive_flags(slave, 2707 BOND_SLAVE_NOTIFY_NOW); 2708 2709 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n"); 2710 2711 bond_miimon_link_change(bond, slave, BOND_LINK_DOWN); 2712 2713 if (slave == rcu_access_pointer(bond->curr_active_slave)) 2714 goto do_failover; 2715 2716 continue; 2717 2718 default: 2719 slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n", 2720 slave->link_new_state); 2721 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 2722 2723 continue; 2724 } 2725 2726 do_failover: 2727 block_netpoll_tx(); 2728 bond_select_active_slave(bond); 2729 unblock_netpoll_tx(); 2730 } 2731 2732 bond_set_carrier(bond); 2733 } 2734 2735 /* bond_mii_monitor 2736 * 2737 * Really a wrapper that splits the mii monitor into two phases: an 2738 * inspection, then (if inspection indicates something needs to be done) 2739 * an acquisition of appropriate locks followed by a commit phase to 2740 * implement whatever link state changes are indicated. 2741 */ 2742 static void bond_mii_monitor(struct work_struct *work) 2743 { 2744 struct bonding *bond = container_of(work, struct bonding, 2745 mii_work.work); 2746 bool should_notify_peers = false; 2747 bool commit; 2748 unsigned long delay; 2749 struct slave *slave; 2750 struct list_head *iter; 2751 2752 delay = msecs_to_jiffies(bond->params.miimon); 2753 2754 if (!bond_has_slaves(bond)) 2755 goto re_arm; 2756 2757 rcu_read_lock(); 2758 should_notify_peers = bond_should_notify_peers(bond); 2759 commit = !!bond_miimon_inspect(bond); 2760 if (bond->send_peer_notif) { 2761 rcu_read_unlock(); 2762 if (rtnl_trylock()) { 2763 bond->send_peer_notif--; 2764 rtnl_unlock(); 2765 } 2766 } else { 2767 rcu_read_unlock(); 2768 } 2769 2770 if (commit) { 2771 /* Race avoidance with bond_close cancel of workqueue */ 2772 if (!rtnl_trylock()) { 2773 delay = 1; 2774 should_notify_peers = false; 2775 goto re_arm; 2776 } 2777 2778 bond_for_each_slave(bond, slave, iter) { 2779 bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER); 2780 } 2781 bond_miimon_commit(bond); 2782 2783 rtnl_unlock(); /* might sleep, hold no other locks */ 2784 } 2785 2786 re_arm: 2787 if (bond->params.miimon) 2788 queue_delayed_work(bond->wq, &bond->mii_work, delay); 2789 2790 if (should_notify_peers) { 2791 if (!rtnl_trylock()) 2792 return; 2793 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); 2794 rtnl_unlock(); 2795 } 2796 } 2797 2798 static int bond_upper_dev_walk(struct net_device *upper, 2799 struct netdev_nested_priv *priv) 2800 { 2801 __be32 ip = *(__be32 *)priv->data; 2802 2803 return ip == bond_confirm_addr(upper, 0, ip); 2804 } 2805 2806 static bool bond_has_this_ip(struct bonding *bond, __be32 ip) 2807 { 2808 struct netdev_nested_priv priv = { 2809 .data = (void *)&ip, 2810 }; 2811 bool ret = false; 2812 2813 if (ip == bond_confirm_addr(bond->dev, 0, ip)) 2814 return true; 2815 2816 rcu_read_lock(); 2817 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &priv)) 2818 ret = true; 2819 rcu_read_unlock(); 2820 2821 return ret; 2822 } 2823 2824 static bool bond_handle_vlan(struct slave *slave, struct bond_vlan_tag *tags, 2825 struct sk_buff *skb) 2826 { 2827 struct net_device *bond_dev = slave->bond->dev; 2828 struct net_device *slave_dev = slave->dev; 2829 struct bond_vlan_tag *outer_tag = tags; 2830 2831 if (!tags || tags->vlan_proto == VLAN_N_VID) 2832 return true; 2833 2834 tags++; 2835 2836 /* Go through all the tags backwards and add them to the packet */ 2837 while (tags->vlan_proto != VLAN_N_VID) { 2838 if (!tags->vlan_id) { 2839 tags++; 2840 continue; 2841 } 2842 2843 slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n", 2844 ntohs(outer_tag->vlan_proto), tags->vlan_id); 2845 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto, 2846 tags->vlan_id); 2847 if (!skb) { 2848 net_err_ratelimited("failed to insert inner VLAN tag\n"); 2849 return false; 2850 } 2851 2852 tags++; 2853 } 2854 /* Set the outer tag */ 2855 if (outer_tag->vlan_id) { 2856 slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n", 2857 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id); 2858 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto, 2859 outer_tag->vlan_id); 2860 } 2861 2862 return true; 2863 } 2864 2865 /* We go to the (large) trouble of VLAN tagging ARP frames because 2866 * switches in VLAN mode (especially if ports are configured as 2867 * "native" to a VLAN) might not pass non-tagged frames. 2868 */ 2869 static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip, 2870 __be32 src_ip, struct bond_vlan_tag *tags) 2871 { 2872 struct net_device *bond_dev = slave->bond->dev; 2873 struct net_device *slave_dev = slave->dev; 2874 struct sk_buff *skb; 2875 2876 slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n", 2877 arp_op, &dest_ip, &src_ip); 2878 2879 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2880 NULL, slave_dev->dev_addr, NULL); 2881 2882 if (!skb) { 2883 net_err_ratelimited("ARP packet allocation failed\n"); 2884 return; 2885 } 2886 2887 if (bond_handle_vlan(slave, tags, skb)) { 2888 slave_update_last_tx(slave); 2889 arp_xmit(skb); 2890 } 2891 2892 return; 2893 } 2894 2895 /* Validate the device path between the @start_dev and the @end_dev. 2896 * The path is valid if the @end_dev is reachable through device 2897 * stacking. 2898 * When the path is validated, collect any vlan information in the 2899 * path. 2900 */ 2901 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev, 2902 struct net_device *end_dev, 2903 int level) 2904 { 2905 struct bond_vlan_tag *tags; 2906 struct net_device *upper; 2907 struct list_head *iter; 2908 2909 if (start_dev == end_dev) { 2910 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC); 2911 if (!tags) 2912 return ERR_PTR(-ENOMEM); 2913 tags[level].vlan_proto = VLAN_N_VID; 2914 return tags; 2915 } 2916 2917 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) { 2918 tags = bond_verify_device_path(upper, end_dev, level + 1); 2919 if (IS_ERR_OR_NULL(tags)) { 2920 if (IS_ERR(tags)) 2921 return tags; 2922 continue; 2923 } 2924 if (is_vlan_dev(upper)) { 2925 tags[level].vlan_proto = vlan_dev_vlan_proto(upper); 2926 tags[level].vlan_id = vlan_dev_vlan_id(upper); 2927 } 2928 2929 return tags; 2930 } 2931 2932 return NULL; 2933 } 2934 2935 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2936 { 2937 struct rtable *rt; 2938 struct bond_vlan_tag *tags; 2939 __be32 *targets = bond->params.arp_targets, addr; 2940 int i; 2941 2942 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) { 2943 slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n", 2944 __func__, &targets[i]); 2945 tags = NULL; 2946 2947 /* Find out through which dev should the packet go */ 2948 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 2949 RTO_ONLINK, 0); 2950 if (IS_ERR(rt)) { 2951 /* there's no route to target - try to send arp 2952 * probe to generate any traffic (arp_validate=0) 2953 */ 2954 if (bond->params.arp_validate) 2955 pr_warn_once("%s: no route to arp_ip_target %pI4 and arp_validate is set\n", 2956 bond->dev->name, 2957 &targets[i]); 2958 bond_arp_send(slave, ARPOP_REQUEST, targets[i], 2959 0, tags); 2960 continue; 2961 } 2962 2963 /* bond device itself */ 2964 if (rt->dst.dev == bond->dev) 2965 goto found; 2966 2967 rcu_read_lock(); 2968 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0); 2969 rcu_read_unlock(); 2970 2971 if (!IS_ERR_OR_NULL(tags)) 2972 goto found; 2973 2974 /* Not our device - skip */ 2975 slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n", 2976 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL"); 2977 2978 ip_rt_put(rt); 2979 continue; 2980 2981 found: 2982 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0); 2983 ip_rt_put(rt); 2984 bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags); 2985 kfree(tags); 2986 } 2987 } 2988 2989 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 2990 { 2991 int i; 2992 2993 if (!sip || !bond_has_this_ip(bond, tip)) { 2994 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n", 2995 __func__, &sip, &tip); 2996 return; 2997 } 2998 2999 i = bond_get_targets_ip(bond->params.arp_targets, sip); 3000 if (i == -1) { 3001 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n", 3002 __func__, &sip); 3003 return; 3004 } 3005 slave->last_rx = jiffies; 3006 slave->target_last_arp_rx[i] = jiffies; 3007 } 3008 3009 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, 3010 struct slave *slave) 3011 { 3012 struct arphdr *arp = (struct arphdr *)skb->data; 3013 struct slave *curr_active_slave, *curr_arp_slave; 3014 unsigned char *arp_ptr; 3015 __be32 sip, tip; 3016 unsigned int alen; 3017 3018 alen = arp_hdr_len(bond->dev); 3019 3020 if (alen > skb_headlen(skb)) { 3021 arp = kmalloc(alen, GFP_ATOMIC); 3022 if (!arp) 3023 goto out_unlock; 3024 if (skb_copy_bits(skb, 0, arp, alen) < 0) 3025 goto out_unlock; 3026 } 3027 3028 if (arp->ar_hln != bond->dev->addr_len || 3029 skb->pkt_type == PACKET_OTHERHOST || 3030 skb->pkt_type == PACKET_LOOPBACK || 3031 arp->ar_hrd != htons(ARPHRD_ETHER) || 3032 arp->ar_pro != htons(ETH_P_IP) || 3033 arp->ar_pln != 4) 3034 goto out_unlock; 3035 3036 arp_ptr = (unsigned char *)(arp + 1); 3037 arp_ptr += bond->dev->addr_len; 3038 memcpy(&sip, arp_ptr, 4); 3039 arp_ptr += 4 + bond->dev->addr_len; 3040 memcpy(&tip, arp_ptr, 4); 3041 3042 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n", 3043 __func__, slave->dev->name, bond_slave_state(slave), 3044 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 3045 &sip, &tip); 3046 3047 curr_active_slave = rcu_dereference(bond->curr_active_slave); 3048 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 3049 3050 /* We 'trust' the received ARP enough to validate it if: 3051 * 3052 * (a) the slave receiving the ARP is active (which includes the 3053 * current ARP slave, if any), or 3054 * 3055 * (b) the receiving slave isn't active, but there is a currently 3056 * active slave and it received valid arp reply(s) after it became 3057 * the currently active slave, or 3058 * 3059 * (c) there is an ARP slave that sent an ARP during the prior ARP 3060 * interval, and we receive an ARP reply on any slave. We accept 3061 * these because switch FDB update delays may deliver the ARP 3062 * reply to a slave other than the sender of the ARP request. 3063 * 3064 * Note: for (b), backup slaves are receiving the broadcast ARP 3065 * request, not a reply. This request passes from the sending 3066 * slave through the L2 switch(es) to the receiving slave. Since 3067 * this is checking the request, sip/tip are swapped for 3068 * validation. 3069 * 3070 * This is done to avoid endless looping when we can't reach the 3071 * arp_ip_target and fool ourselves with our own arp requests. 3072 */ 3073 if (bond_is_active_slave(slave)) 3074 bond_validate_arp(bond, slave, sip, tip); 3075 else if (curr_active_slave && 3076 time_after(slave_last_rx(bond, curr_active_slave), 3077 curr_active_slave->last_link_up)) 3078 bond_validate_arp(bond, slave, tip, sip); 3079 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) && 3080 bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1)) 3081 bond_validate_arp(bond, slave, sip, tip); 3082 3083 out_unlock: 3084 if (arp != (struct arphdr *)skb->data) 3085 kfree(arp); 3086 return RX_HANDLER_ANOTHER; 3087 } 3088 3089 #if IS_ENABLED(CONFIG_IPV6) 3090 static void bond_ns_send(struct slave *slave, const struct in6_addr *daddr, 3091 const struct in6_addr *saddr, struct bond_vlan_tag *tags) 3092 { 3093 struct net_device *bond_dev = slave->bond->dev; 3094 struct net_device *slave_dev = slave->dev; 3095 struct in6_addr mcaddr; 3096 struct sk_buff *skb; 3097 3098 slave_dbg(bond_dev, slave_dev, "NS on slave: dst %pI6c src %pI6c\n", 3099 daddr, saddr); 3100 3101 skb = ndisc_ns_create(slave_dev, daddr, saddr, 0); 3102 if (!skb) { 3103 net_err_ratelimited("NS packet allocation failed\n"); 3104 return; 3105 } 3106 3107 addrconf_addr_solict_mult(daddr, &mcaddr); 3108 if (bond_handle_vlan(slave, tags, skb)) { 3109 slave_update_last_tx(slave); 3110 ndisc_send_skb(skb, &mcaddr, saddr); 3111 } 3112 } 3113 3114 static void bond_ns_send_all(struct bonding *bond, struct slave *slave) 3115 { 3116 struct in6_addr *targets = bond->params.ns_targets; 3117 struct bond_vlan_tag *tags; 3118 struct dst_entry *dst; 3119 struct in6_addr saddr; 3120 struct flowi6 fl6; 3121 int i; 3122 3123 for (i = 0; i < BOND_MAX_NS_TARGETS && !ipv6_addr_any(&targets[i]); i++) { 3124 slave_dbg(bond->dev, slave->dev, "%s: target %pI6c\n", 3125 __func__, &targets[i]); 3126 tags = NULL; 3127 3128 /* Find out through which dev should the packet go */ 3129 memset(&fl6, 0, sizeof(struct flowi6)); 3130 fl6.daddr = targets[i]; 3131 fl6.flowi6_oif = bond->dev->ifindex; 3132 3133 dst = ip6_route_output(dev_net(bond->dev), NULL, &fl6); 3134 if (dst->error) { 3135 dst_release(dst); 3136 /* there's no route to target - try to send arp 3137 * probe to generate any traffic (arp_validate=0) 3138 */ 3139 if (bond->params.arp_validate) 3140 pr_warn_once("%s: no route to ns_ip6_target %pI6c and arp_validate is set\n", 3141 bond->dev->name, 3142 &targets[i]); 3143 bond_ns_send(slave, &targets[i], &in6addr_any, tags); 3144 continue; 3145 } 3146 3147 /* bond device itself */ 3148 if (dst->dev == bond->dev) 3149 goto found; 3150 3151 rcu_read_lock(); 3152 tags = bond_verify_device_path(bond->dev, dst->dev, 0); 3153 rcu_read_unlock(); 3154 3155 if (!IS_ERR_OR_NULL(tags)) 3156 goto found; 3157 3158 /* Not our device - skip */ 3159 slave_dbg(bond->dev, slave->dev, "no path to ns_ip6_target %pI6c via dst->dev %s\n", 3160 &targets[i], dst->dev ? dst->dev->name : "NULL"); 3161 3162 dst_release(dst); 3163 continue; 3164 3165 found: 3166 if (!ipv6_dev_get_saddr(dev_net(dst->dev), dst->dev, &targets[i], 0, &saddr)) 3167 bond_ns_send(slave, &targets[i], &saddr, tags); 3168 else 3169 bond_ns_send(slave, &targets[i], &in6addr_any, tags); 3170 3171 dst_release(dst); 3172 kfree(tags); 3173 } 3174 } 3175 3176 static int bond_confirm_addr6(struct net_device *dev, 3177 struct netdev_nested_priv *priv) 3178 { 3179 struct in6_addr *addr = (struct in6_addr *)priv->data; 3180 3181 return ipv6_chk_addr(dev_net(dev), addr, dev, 0); 3182 } 3183 3184 static bool bond_has_this_ip6(struct bonding *bond, struct in6_addr *addr) 3185 { 3186 struct netdev_nested_priv priv = { 3187 .data = addr, 3188 }; 3189 int ret = false; 3190 3191 if (bond_confirm_addr6(bond->dev, &priv)) 3192 return true; 3193 3194 rcu_read_lock(); 3195 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_confirm_addr6, &priv)) 3196 ret = true; 3197 rcu_read_unlock(); 3198 3199 return ret; 3200 } 3201 3202 static void bond_validate_na(struct bonding *bond, struct slave *slave, 3203 struct in6_addr *saddr, struct in6_addr *daddr) 3204 { 3205 int i; 3206 3207 /* Ignore NAs that: 3208 * 1. Source address is unspecified address. 3209 * 2. Dest address is neither all-nodes multicast address nor 3210 * exist on bond interface. 3211 */ 3212 if (ipv6_addr_any(saddr) || 3213 (!ipv6_addr_equal(daddr, &in6addr_linklocal_allnodes) && 3214 !bond_has_this_ip6(bond, daddr))) { 3215 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c tip %pI6c not found\n", 3216 __func__, saddr, daddr); 3217 return; 3218 } 3219 3220 i = bond_get_targets_ip6(bond->params.ns_targets, saddr); 3221 if (i == -1) { 3222 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c not found in targets\n", 3223 __func__, saddr); 3224 return; 3225 } 3226 slave->last_rx = jiffies; 3227 slave->target_last_arp_rx[i] = jiffies; 3228 } 3229 3230 static int bond_na_rcv(const struct sk_buff *skb, struct bonding *bond, 3231 struct slave *slave) 3232 { 3233 struct slave *curr_active_slave, *curr_arp_slave; 3234 struct in6_addr *saddr, *daddr; 3235 struct { 3236 struct ipv6hdr ip6; 3237 struct icmp6hdr icmp6; 3238 } *combined, _combined; 3239 3240 if (skb->pkt_type == PACKET_OTHERHOST || 3241 skb->pkt_type == PACKET_LOOPBACK) 3242 goto out; 3243 3244 combined = skb_header_pointer(skb, 0, sizeof(_combined), &_combined); 3245 if (!combined || combined->ip6.nexthdr != NEXTHDR_ICMP || 3246 combined->icmp6.icmp6_type != NDISC_NEIGHBOUR_ADVERTISEMENT) 3247 goto out; 3248 3249 saddr = &combined->ip6.saddr; 3250 daddr = &combined->ip6.daddr; 3251 3252 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI6c tip %pI6c\n", 3253 __func__, slave->dev->name, bond_slave_state(slave), 3254 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 3255 saddr, daddr); 3256 3257 curr_active_slave = rcu_dereference(bond->curr_active_slave); 3258 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 3259 3260 /* We 'trust' the received ARP enough to validate it if: 3261 * see bond_arp_rcv(). 3262 */ 3263 if (bond_is_active_slave(slave)) 3264 bond_validate_na(bond, slave, saddr, daddr); 3265 else if (curr_active_slave && 3266 time_after(slave_last_rx(bond, curr_active_slave), 3267 curr_active_slave->last_link_up)) 3268 bond_validate_na(bond, slave, saddr, daddr); 3269 else if (curr_arp_slave && 3270 bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1)) 3271 bond_validate_na(bond, slave, saddr, daddr); 3272 3273 out: 3274 return RX_HANDLER_ANOTHER; 3275 } 3276 #endif 3277 3278 int bond_rcv_validate(const struct sk_buff *skb, struct bonding *bond, 3279 struct slave *slave) 3280 { 3281 #if IS_ENABLED(CONFIG_IPV6) 3282 bool is_ipv6 = skb->protocol == __cpu_to_be16(ETH_P_IPV6); 3283 #endif 3284 bool is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP); 3285 3286 slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n", 3287 __func__, skb->dev->name); 3288 3289 /* Use arp validate logic for both ARP and NS */ 3290 if (!slave_do_arp_validate(bond, slave)) { 3291 if ((slave_do_arp_validate_only(bond) && is_arp) || 3292 #if IS_ENABLED(CONFIG_IPV6) 3293 (slave_do_arp_validate_only(bond) && is_ipv6) || 3294 #endif 3295 !slave_do_arp_validate_only(bond)) 3296 slave->last_rx = jiffies; 3297 return RX_HANDLER_ANOTHER; 3298 } else if (is_arp) { 3299 return bond_arp_rcv(skb, bond, slave); 3300 #if IS_ENABLED(CONFIG_IPV6) 3301 } else if (is_ipv6) { 3302 return bond_na_rcv(skb, bond, slave); 3303 #endif 3304 } else { 3305 return RX_HANDLER_ANOTHER; 3306 } 3307 } 3308 3309 static void bond_send_validate(struct bonding *bond, struct slave *slave) 3310 { 3311 bond_arp_send_all(bond, slave); 3312 #if IS_ENABLED(CONFIG_IPV6) 3313 bond_ns_send_all(bond, slave); 3314 #endif 3315 } 3316 3317 /* function to verify if we're in the arp_interval timeslice, returns true if 3318 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval + 3319 * arp_interval/2) . the arp_interval/2 is needed for really fast networks. 3320 */ 3321 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 3322 int mod) 3323 { 3324 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3325 3326 return time_in_range(jiffies, 3327 last_act - delta_in_ticks, 3328 last_act + mod * delta_in_ticks + delta_in_ticks/2); 3329 } 3330 3331 /* This function is called regularly to monitor each slave's link 3332 * ensuring that traffic is being sent and received when arp monitoring 3333 * is used in load-balancing mode. if the adapter has been dormant, then an 3334 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 3335 * arp monitoring in active backup mode. 3336 */ 3337 static void bond_loadbalance_arp_mon(struct bonding *bond) 3338 { 3339 struct slave *slave, *oldcurrent; 3340 struct list_head *iter; 3341 int do_failover = 0, slave_state_changed = 0; 3342 3343 if (!bond_has_slaves(bond)) 3344 goto re_arm; 3345 3346 rcu_read_lock(); 3347 3348 oldcurrent = rcu_dereference(bond->curr_active_slave); 3349 /* see if any of the previous devices are up now (i.e. they have 3350 * xmt and rcv traffic). the curr_active_slave does not come into 3351 * the picture unless it is null. also, slave->last_link_up is not 3352 * needed here because we send an arp on each slave and give a slave 3353 * as long as it needs to get the tx/rx within the delta. 3354 * TODO: what about up/down delay in arp mode? it wasn't here before 3355 * so it can wait 3356 */ 3357 bond_for_each_slave_rcu(bond, slave, iter) { 3358 unsigned long last_tx = slave_last_tx(slave); 3359 3360 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 3361 3362 if (slave->link != BOND_LINK_UP) { 3363 if (bond_time_in_interval(bond, last_tx, 1) && 3364 bond_time_in_interval(bond, slave->last_rx, 1)) { 3365 3366 bond_propose_link_state(slave, BOND_LINK_UP); 3367 slave_state_changed = 1; 3368 3369 /* primary_slave has no meaning in round-robin 3370 * mode. the window of a slave being up and 3371 * curr_active_slave being null after enslaving 3372 * is closed. 3373 */ 3374 if (!oldcurrent) { 3375 slave_info(bond->dev, slave->dev, "link status definitely up\n"); 3376 do_failover = 1; 3377 } else { 3378 slave_info(bond->dev, slave->dev, "interface is now up\n"); 3379 } 3380 } 3381 } else { 3382 /* slave->link == BOND_LINK_UP */ 3383 3384 /* not all switches will respond to an arp request 3385 * when the source ip is 0, so don't take the link down 3386 * if we don't know our ip yet 3387 */ 3388 if (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) || 3389 !bond_time_in_interval(bond, slave->last_rx, bond->params.missed_max)) { 3390 3391 bond_propose_link_state(slave, BOND_LINK_DOWN); 3392 slave_state_changed = 1; 3393 3394 if (slave->link_failure_count < UINT_MAX) 3395 slave->link_failure_count++; 3396 3397 slave_info(bond->dev, slave->dev, "interface is now down\n"); 3398 3399 if (slave == oldcurrent) 3400 do_failover = 1; 3401 } 3402 } 3403 3404 /* note: if switch is in round-robin mode, all links 3405 * must tx arp to ensure all links rx an arp - otherwise 3406 * links may oscillate or not come up at all; if switch is 3407 * in something like xor mode, there is nothing we can 3408 * do - all replies will be rx'ed on same link causing slaves 3409 * to be unstable during low/no traffic periods 3410 */ 3411 if (bond_slave_is_up(slave)) 3412 bond_send_validate(bond, slave); 3413 } 3414 3415 rcu_read_unlock(); 3416 3417 if (do_failover || slave_state_changed) { 3418 if (!rtnl_trylock()) 3419 goto re_arm; 3420 3421 bond_for_each_slave(bond, slave, iter) { 3422 if (slave->link_new_state != BOND_LINK_NOCHANGE) 3423 slave->link = slave->link_new_state; 3424 } 3425 3426 if (slave_state_changed) { 3427 bond_slave_state_change(bond); 3428 if (BOND_MODE(bond) == BOND_MODE_XOR) 3429 bond_update_slave_arr(bond, NULL); 3430 } 3431 if (do_failover) { 3432 block_netpoll_tx(); 3433 bond_select_active_slave(bond); 3434 unblock_netpoll_tx(); 3435 } 3436 rtnl_unlock(); 3437 } 3438 3439 re_arm: 3440 if (bond->params.arp_interval) 3441 queue_delayed_work(bond->wq, &bond->arp_work, 3442 msecs_to_jiffies(bond->params.arp_interval)); 3443 } 3444 3445 /* Called to inspect slaves for active-backup mode ARP monitor link state 3446 * changes. Sets proposed link state in slaves to specify what action 3447 * should take place for the slave. Returns 0 if no changes are found, >0 3448 * if changes to link states must be committed. 3449 * 3450 * Called with rcu_read_lock held. 3451 */ 3452 static int bond_ab_arp_inspect(struct bonding *bond) 3453 { 3454 unsigned long last_tx, last_rx; 3455 struct list_head *iter; 3456 struct slave *slave; 3457 int commit = 0; 3458 3459 bond_for_each_slave_rcu(bond, slave, iter) { 3460 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 3461 last_rx = slave_last_rx(bond, slave); 3462 3463 if (slave->link != BOND_LINK_UP) { 3464 if (bond_time_in_interval(bond, last_rx, 1)) { 3465 bond_propose_link_state(slave, BOND_LINK_UP); 3466 commit++; 3467 } else if (slave->link == BOND_LINK_BACK) { 3468 bond_propose_link_state(slave, BOND_LINK_FAIL); 3469 commit++; 3470 } 3471 continue; 3472 } 3473 3474 /* Give slaves 2*delta after being enslaved or made 3475 * active. This avoids bouncing, as the last receive 3476 * times need a full ARP monitor cycle to be updated. 3477 */ 3478 if (bond_time_in_interval(bond, slave->last_link_up, 2)) 3479 continue; 3480 3481 /* Backup slave is down if: 3482 * - No current_arp_slave AND 3483 * - more than (missed_max+1)*delta since last receive AND 3484 * - the bond has an IP address 3485 * 3486 * Note: a non-null current_arp_slave indicates 3487 * the curr_active_slave went down and we are 3488 * searching for a new one; under this condition 3489 * we only take the curr_active_slave down - this 3490 * gives each slave a chance to tx/rx traffic 3491 * before being taken out 3492 */ 3493 if (!bond_is_active_slave(slave) && 3494 !rcu_access_pointer(bond->current_arp_slave) && 3495 !bond_time_in_interval(bond, last_rx, bond->params.missed_max + 1)) { 3496 bond_propose_link_state(slave, BOND_LINK_DOWN); 3497 commit++; 3498 } 3499 3500 /* Active slave is down if: 3501 * - more than missed_max*delta since transmitting OR 3502 * - (more than missed_max*delta since receive AND 3503 * the bond has an IP address) 3504 */ 3505 last_tx = slave_last_tx(slave); 3506 if (bond_is_active_slave(slave) && 3507 (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) || 3508 !bond_time_in_interval(bond, last_rx, bond->params.missed_max))) { 3509 bond_propose_link_state(slave, BOND_LINK_DOWN); 3510 commit++; 3511 } 3512 } 3513 3514 return commit; 3515 } 3516 3517 /* Called to commit link state changes noted by inspection step of 3518 * active-backup mode ARP monitor. 3519 * 3520 * Called with RTNL hold. 3521 */ 3522 static void bond_ab_arp_commit(struct bonding *bond) 3523 { 3524 struct list_head *iter; 3525 unsigned long last_tx; 3526 struct slave *slave; 3527 3528 bond_for_each_slave(bond, slave, iter) { 3529 switch (slave->link_new_state) { 3530 case BOND_LINK_NOCHANGE: 3531 continue; 3532 3533 case BOND_LINK_UP: 3534 last_tx = slave_last_tx(slave); 3535 if (rtnl_dereference(bond->curr_active_slave) != slave || 3536 (!rtnl_dereference(bond->curr_active_slave) && 3537 bond_time_in_interval(bond, last_tx, 1))) { 3538 struct slave *current_arp_slave; 3539 3540 current_arp_slave = rtnl_dereference(bond->current_arp_slave); 3541 bond_set_slave_link_state(slave, BOND_LINK_UP, 3542 BOND_SLAVE_NOTIFY_NOW); 3543 if (current_arp_slave) { 3544 bond_set_slave_inactive_flags( 3545 current_arp_slave, 3546 BOND_SLAVE_NOTIFY_NOW); 3547 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3548 } 3549 3550 slave_info(bond->dev, slave->dev, "link status definitely up\n"); 3551 3552 if (!rtnl_dereference(bond->curr_active_slave) || 3553 slave == rtnl_dereference(bond->primary_slave)) 3554 goto do_failover; 3555 3556 } 3557 3558 continue; 3559 3560 case BOND_LINK_DOWN: 3561 if (slave->link_failure_count < UINT_MAX) 3562 slave->link_failure_count++; 3563 3564 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 3565 BOND_SLAVE_NOTIFY_NOW); 3566 bond_set_slave_inactive_flags(slave, 3567 BOND_SLAVE_NOTIFY_NOW); 3568 3569 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n"); 3570 3571 if (slave == rtnl_dereference(bond->curr_active_slave)) { 3572 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3573 goto do_failover; 3574 } 3575 3576 continue; 3577 3578 case BOND_LINK_FAIL: 3579 bond_set_slave_link_state(slave, BOND_LINK_FAIL, 3580 BOND_SLAVE_NOTIFY_NOW); 3581 bond_set_slave_inactive_flags(slave, 3582 BOND_SLAVE_NOTIFY_NOW); 3583 3584 /* A slave has just been enslaved and has become 3585 * the current active slave. 3586 */ 3587 if (rtnl_dereference(bond->curr_active_slave)) 3588 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3589 continue; 3590 3591 default: 3592 slave_err(bond->dev, slave->dev, 3593 "impossible: link_new_state %d on slave\n", 3594 slave->link_new_state); 3595 continue; 3596 } 3597 3598 do_failover: 3599 block_netpoll_tx(); 3600 bond_select_active_slave(bond); 3601 unblock_netpoll_tx(); 3602 } 3603 3604 bond_set_carrier(bond); 3605 } 3606 3607 /* Send ARP probes for active-backup mode ARP monitor. 3608 * 3609 * Called with rcu_read_lock held. 3610 */ 3611 static bool bond_ab_arp_probe(struct bonding *bond) 3612 { 3613 struct slave *slave, *before = NULL, *new_slave = NULL, 3614 *curr_arp_slave = rcu_dereference(bond->current_arp_slave), 3615 *curr_active_slave = rcu_dereference(bond->curr_active_slave); 3616 struct list_head *iter; 3617 bool found = false; 3618 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; 3619 3620 if (curr_arp_slave && curr_active_slave) 3621 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n", 3622 curr_arp_slave->dev->name, 3623 curr_active_slave->dev->name); 3624 3625 if (curr_active_slave) { 3626 bond_send_validate(bond, curr_active_slave); 3627 return should_notify_rtnl; 3628 } 3629 3630 /* if we don't have a curr_active_slave, search for the next available 3631 * backup slave from the current_arp_slave and make it the candidate 3632 * for becoming the curr_active_slave 3633 */ 3634 3635 if (!curr_arp_slave) { 3636 curr_arp_slave = bond_first_slave_rcu(bond); 3637 if (!curr_arp_slave) 3638 return should_notify_rtnl; 3639 } 3640 3641 bond_for_each_slave_rcu(bond, slave, iter) { 3642 if (!found && !before && bond_slave_is_up(slave)) 3643 before = slave; 3644 3645 if (found && !new_slave && bond_slave_is_up(slave)) 3646 new_slave = slave; 3647 /* if the link state is up at this point, we 3648 * mark it down - this can happen if we have 3649 * simultaneous link failures and 3650 * reselect_active_interface doesn't make this 3651 * one the current slave so it is still marked 3652 * up when it is actually down 3653 */ 3654 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 3655 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 3656 BOND_SLAVE_NOTIFY_LATER); 3657 if (slave->link_failure_count < UINT_MAX) 3658 slave->link_failure_count++; 3659 3660 bond_set_slave_inactive_flags(slave, 3661 BOND_SLAVE_NOTIFY_LATER); 3662 3663 slave_info(bond->dev, slave->dev, "backup interface is now down\n"); 3664 } 3665 if (slave == curr_arp_slave) 3666 found = true; 3667 } 3668 3669 if (!new_slave && before) 3670 new_slave = before; 3671 3672 if (!new_slave) 3673 goto check_state; 3674 3675 bond_set_slave_link_state(new_slave, BOND_LINK_BACK, 3676 BOND_SLAVE_NOTIFY_LATER); 3677 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER); 3678 bond_send_validate(bond, new_slave); 3679 new_slave->last_link_up = jiffies; 3680 rcu_assign_pointer(bond->current_arp_slave, new_slave); 3681 3682 check_state: 3683 bond_for_each_slave_rcu(bond, slave, iter) { 3684 if (slave->should_notify || slave->should_notify_link) { 3685 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; 3686 break; 3687 } 3688 } 3689 return should_notify_rtnl; 3690 } 3691 3692 static void bond_activebackup_arp_mon(struct bonding *bond) 3693 { 3694 bool should_notify_peers = false; 3695 bool should_notify_rtnl = false; 3696 int delta_in_ticks; 3697 3698 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3699 3700 if (!bond_has_slaves(bond)) 3701 goto re_arm; 3702 3703 rcu_read_lock(); 3704 3705 should_notify_peers = bond_should_notify_peers(bond); 3706 3707 if (bond_ab_arp_inspect(bond)) { 3708 rcu_read_unlock(); 3709 3710 /* Race avoidance with bond_close flush of workqueue */ 3711 if (!rtnl_trylock()) { 3712 delta_in_ticks = 1; 3713 should_notify_peers = false; 3714 goto re_arm; 3715 } 3716 3717 bond_ab_arp_commit(bond); 3718 3719 rtnl_unlock(); 3720 rcu_read_lock(); 3721 } 3722 3723 should_notify_rtnl = bond_ab_arp_probe(bond); 3724 rcu_read_unlock(); 3725 3726 re_arm: 3727 if (bond->params.arp_interval) 3728 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 3729 3730 if (should_notify_peers || should_notify_rtnl) { 3731 if (!rtnl_trylock()) 3732 return; 3733 3734 if (should_notify_peers) { 3735 bond->send_peer_notif--; 3736 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 3737 bond->dev); 3738 } 3739 if (should_notify_rtnl) { 3740 bond_slave_state_notify(bond); 3741 bond_slave_link_notify(bond); 3742 } 3743 3744 rtnl_unlock(); 3745 } 3746 } 3747 3748 static void bond_arp_monitor(struct work_struct *work) 3749 { 3750 struct bonding *bond = container_of(work, struct bonding, 3751 arp_work.work); 3752 3753 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3754 bond_activebackup_arp_mon(bond); 3755 else 3756 bond_loadbalance_arp_mon(bond); 3757 } 3758 3759 /*-------------------------- netdev event handling --------------------------*/ 3760 3761 /* Change device name */ 3762 static int bond_event_changename(struct bonding *bond) 3763 { 3764 bond_remove_proc_entry(bond); 3765 bond_create_proc_entry(bond); 3766 3767 bond_debug_reregister(bond); 3768 3769 return NOTIFY_DONE; 3770 } 3771 3772 static int bond_master_netdev_event(unsigned long event, 3773 struct net_device *bond_dev) 3774 { 3775 struct bonding *event_bond = netdev_priv(bond_dev); 3776 3777 netdev_dbg(bond_dev, "%s called\n", __func__); 3778 3779 switch (event) { 3780 case NETDEV_CHANGENAME: 3781 return bond_event_changename(event_bond); 3782 case NETDEV_UNREGISTER: 3783 bond_remove_proc_entry(event_bond); 3784 #ifdef CONFIG_XFRM_OFFLOAD 3785 xfrm_dev_state_flush(dev_net(bond_dev), bond_dev, true); 3786 #endif /* CONFIG_XFRM_OFFLOAD */ 3787 break; 3788 case NETDEV_REGISTER: 3789 bond_create_proc_entry(event_bond); 3790 break; 3791 default: 3792 break; 3793 } 3794 3795 return NOTIFY_DONE; 3796 } 3797 3798 static int bond_slave_netdev_event(unsigned long event, 3799 struct net_device *slave_dev) 3800 { 3801 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary; 3802 struct bonding *bond; 3803 struct net_device *bond_dev; 3804 3805 /* A netdev event can be generated while enslaving a device 3806 * before netdev_rx_handler_register is called in which case 3807 * slave will be NULL 3808 */ 3809 if (!slave) { 3810 netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__); 3811 return NOTIFY_DONE; 3812 } 3813 3814 bond_dev = slave->bond->dev; 3815 bond = slave->bond; 3816 primary = rtnl_dereference(bond->primary_slave); 3817 3818 slave_dbg(bond_dev, slave_dev, "%s called\n", __func__); 3819 3820 switch (event) { 3821 case NETDEV_UNREGISTER: 3822 if (bond_dev->type != ARPHRD_ETHER) 3823 bond_release_and_destroy(bond_dev, slave_dev); 3824 else 3825 __bond_release_one(bond_dev, slave_dev, false, true); 3826 break; 3827 case NETDEV_UP: 3828 case NETDEV_CHANGE: 3829 /* For 802.3ad mode only: 3830 * Getting invalid Speed/Duplex values here will put slave 3831 * in weird state. Mark it as link-fail if the link was 3832 * previously up or link-down if it hasn't yet come up, and 3833 * let link-monitoring (miimon) set it right when correct 3834 * speeds/duplex are available. 3835 */ 3836 if (bond_update_speed_duplex(slave) && 3837 BOND_MODE(bond) == BOND_MODE_8023AD) { 3838 if (slave->last_link_up) 3839 slave->link = BOND_LINK_FAIL; 3840 else 3841 slave->link = BOND_LINK_DOWN; 3842 } 3843 3844 if (BOND_MODE(bond) == BOND_MODE_8023AD) 3845 bond_3ad_adapter_speed_duplex_changed(slave); 3846 fallthrough; 3847 case NETDEV_DOWN: 3848 /* Refresh slave-array if applicable! 3849 * If the setup does not use miimon or arpmon (mode-specific!), 3850 * then these events will not cause the slave-array to be 3851 * refreshed. This will cause xmit to use a slave that is not 3852 * usable. Avoid such situation by refeshing the array at these 3853 * events. If these (miimon/arpmon) parameters are configured 3854 * then array gets refreshed twice and that should be fine! 3855 */ 3856 if (bond_mode_can_use_xmit_hash(bond)) 3857 bond_update_slave_arr(bond, NULL); 3858 break; 3859 case NETDEV_CHANGEMTU: 3860 /* TODO: Should slaves be allowed to 3861 * independently alter their MTU? For 3862 * an active-backup bond, slaves need 3863 * not be the same type of device, so 3864 * MTUs may vary. For other modes, 3865 * slaves arguably should have the 3866 * same MTUs. To do this, we'd need to 3867 * take over the slave's change_mtu 3868 * function for the duration of their 3869 * servitude. 3870 */ 3871 break; 3872 case NETDEV_CHANGENAME: 3873 /* we don't care if we don't have primary set */ 3874 if (!bond_uses_primary(bond) || 3875 !bond->params.primary[0]) 3876 break; 3877 3878 if (slave == primary) { 3879 /* slave's name changed - he's no longer primary */ 3880 RCU_INIT_POINTER(bond->primary_slave, NULL); 3881 } else if (!strcmp(slave_dev->name, bond->params.primary)) { 3882 /* we have a new primary slave */ 3883 rcu_assign_pointer(bond->primary_slave, slave); 3884 } else { /* we didn't change primary - exit */ 3885 break; 3886 } 3887 3888 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n", 3889 primary ? slave_dev->name : "none"); 3890 3891 block_netpoll_tx(); 3892 bond_select_active_slave(bond); 3893 unblock_netpoll_tx(); 3894 break; 3895 case NETDEV_FEAT_CHANGE: 3896 bond_compute_features(bond); 3897 break; 3898 case NETDEV_RESEND_IGMP: 3899 /* Propagate to master device */ 3900 call_netdevice_notifiers(event, slave->bond->dev); 3901 break; 3902 default: 3903 break; 3904 } 3905 3906 return NOTIFY_DONE; 3907 } 3908 3909 /* bond_netdev_event: handle netdev notifier chain events. 3910 * 3911 * This function receives events for the netdev chain. The caller (an 3912 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 3913 * locks for us to safely manipulate the slave devices (RTNL lock, 3914 * dev_probe_lock). 3915 */ 3916 static int bond_netdev_event(struct notifier_block *this, 3917 unsigned long event, void *ptr) 3918 { 3919 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 3920 3921 netdev_dbg(event_dev, "%s received %s\n", 3922 __func__, netdev_cmd_to_name(event)); 3923 3924 if (!(event_dev->priv_flags & IFF_BONDING)) 3925 return NOTIFY_DONE; 3926 3927 if (event_dev->flags & IFF_MASTER) { 3928 int ret; 3929 3930 ret = bond_master_netdev_event(event, event_dev); 3931 if (ret != NOTIFY_DONE) 3932 return ret; 3933 } 3934 3935 if (event_dev->flags & IFF_SLAVE) 3936 return bond_slave_netdev_event(event, event_dev); 3937 3938 return NOTIFY_DONE; 3939 } 3940 3941 static struct notifier_block bond_netdev_notifier = { 3942 .notifier_call = bond_netdev_event, 3943 }; 3944 3945 /*---------------------------- Hashing Policies -----------------------------*/ 3946 3947 /* Helper to access data in a packet, with or without a backing skb. 3948 * If skb is given the data is linearized if necessary via pskb_may_pull. 3949 */ 3950 static inline const void *bond_pull_data(struct sk_buff *skb, 3951 const void *data, int hlen, int n) 3952 { 3953 if (likely(n <= hlen)) 3954 return data; 3955 else if (skb && likely(pskb_may_pull(skb, n))) 3956 return skb->head; 3957 3958 return NULL; 3959 } 3960 3961 /* L2 hash helper */ 3962 static inline u32 bond_eth_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen) 3963 { 3964 struct ethhdr *ep; 3965 3966 data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr)); 3967 if (!data) 3968 return 0; 3969 3970 ep = (struct ethhdr *)(data + mhoff); 3971 return ep->h_dest[5] ^ ep->h_source[5] ^ be16_to_cpu(ep->h_proto); 3972 } 3973 3974 static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk, const void *data, 3975 int hlen, __be16 l2_proto, int *nhoff, int *ip_proto, bool l34) 3976 { 3977 const struct ipv6hdr *iph6; 3978 const struct iphdr *iph; 3979 3980 if (l2_proto == htons(ETH_P_IP)) { 3981 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph)); 3982 if (!data) 3983 return false; 3984 3985 iph = (const struct iphdr *)(data + *nhoff); 3986 iph_to_flow_copy_v4addrs(fk, iph); 3987 *nhoff += iph->ihl << 2; 3988 if (!ip_is_fragment(iph)) 3989 *ip_proto = iph->protocol; 3990 } else if (l2_proto == htons(ETH_P_IPV6)) { 3991 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph6)); 3992 if (!data) 3993 return false; 3994 3995 iph6 = (const struct ipv6hdr *)(data + *nhoff); 3996 iph_to_flow_copy_v6addrs(fk, iph6); 3997 *nhoff += sizeof(*iph6); 3998 *ip_proto = iph6->nexthdr; 3999 } else { 4000 return false; 4001 } 4002 4003 if (l34 && *ip_proto >= 0) 4004 fk->ports.ports = __skb_flow_get_ports(skb, *nhoff, *ip_proto, data, hlen); 4005 4006 return true; 4007 } 4008 4009 static u32 bond_vlan_srcmac_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen) 4010 { 4011 u32 srcmac_vendor = 0, srcmac_dev = 0; 4012 struct ethhdr *mac_hdr; 4013 u16 vlan = 0; 4014 int i; 4015 4016 data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr)); 4017 if (!data) 4018 return 0; 4019 mac_hdr = (struct ethhdr *)(data + mhoff); 4020 4021 for (i = 0; i < 3; i++) 4022 srcmac_vendor = (srcmac_vendor << 8) | mac_hdr->h_source[i]; 4023 4024 for (i = 3; i < ETH_ALEN; i++) 4025 srcmac_dev = (srcmac_dev << 8) | mac_hdr->h_source[i]; 4026 4027 if (skb && skb_vlan_tag_present(skb)) 4028 vlan = skb_vlan_tag_get(skb); 4029 4030 return vlan ^ srcmac_vendor ^ srcmac_dev; 4031 } 4032 4033 /* Extract the appropriate headers based on bond's xmit policy */ 4034 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, const void *data, 4035 __be16 l2_proto, int nhoff, int hlen, struct flow_keys *fk) 4036 { 4037 bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34; 4038 int ip_proto = -1; 4039 4040 switch (bond->params.xmit_policy) { 4041 case BOND_XMIT_POLICY_ENCAP23: 4042 case BOND_XMIT_POLICY_ENCAP34: 4043 memset(fk, 0, sizeof(*fk)); 4044 return __skb_flow_dissect(NULL, skb, &flow_keys_bonding, 4045 fk, data, l2_proto, nhoff, hlen, 0); 4046 default: 4047 break; 4048 } 4049 4050 fk->ports.ports = 0; 4051 memset(&fk->icmp, 0, sizeof(fk->icmp)); 4052 if (!bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34)) 4053 return false; 4054 4055 /* ICMP error packets contains at least 8 bytes of the header 4056 * of the packet which generated the error. Use this information 4057 * to correlate ICMP error packets within the same flow which 4058 * generated the error. 4059 */ 4060 if (ip_proto == IPPROTO_ICMP || ip_proto == IPPROTO_ICMPV6) { 4061 skb_flow_get_icmp_tci(skb, &fk->icmp, data, nhoff, hlen); 4062 if (ip_proto == IPPROTO_ICMP) { 4063 if (!icmp_is_err(fk->icmp.type)) 4064 return true; 4065 4066 nhoff += sizeof(struct icmphdr); 4067 } else if (ip_proto == IPPROTO_ICMPV6) { 4068 if (!icmpv6_is_err(fk->icmp.type)) 4069 return true; 4070 4071 nhoff += sizeof(struct icmp6hdr); 4072 } 4073 return bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34); 4074 } 4075 4076 return true; 4077 } 4078 4079 static u32 bond_ip_hash(u32 hash, struct flow_keys *flow, int xmit_policy) 4080 { 4081 hash ^= (__force u32)flow_get_u32_dst(flow) ^ 4082 (__force u32)flow_get_u32_src(flow); 4083 hash ^= (hash >> 16); 4084 hash ^= (hash >> 8); 4085 4086 /* discard lowest hash bit to deal with the common even ports pattern */ 4087 if (xmit_policy == BOND_XMIT_POLICY_LAYER34 || 4088 xmit_policy == BOND_XMIT_POLICY_ENCAP34) 4089 return hash >> 1; 4090 4091 return hash; 4092 } 4093 4094 /* Generate hash based on xmit policy. If @skb is given it is used to linearize 4095 * the data as required, but this function can be used without it if the data is 4096 * known to be linear (e.g. with xdp_buff). 4097 */ 4098 static u32 __bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, const void *data, 4099 __be16 l2_proto, int mhoff, int nhoff, int hlen) 4100 { 4101 struct flow_keys flow; 4102 u32 hash; 4103 4104 if (bond->params.xmit_policy == BOND_XMIT_POLICY_VLAN_SRCMAC) 4105 return bond_vlan_srcmac_hash(skb, data, mhoff, hlen); 4106 4107 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 || 4108 !bond_flow_dissect(bond, skb, data, l2_proto, nhoff, hlen, &flow)) 4109 return bond_eth_hash(skb, data, mhoff, hlen); 4110 4111 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 || 4112 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) { 4113 hash = bond_eth_hash(skb, data, mhoff, hlen); 4114 } else { 4115 if (flow.icmp.id) 4116 memcpy(&hash, &flow.icmp, sizeof(hash)); 4117 else 4118 memcpy(&hash, &flow.ports.ports, sizeof(hash)); 4119 } 4120 4121 return bond_ip_hash(hash, &flow, bond->params.xmit_policy); 4122 } 4123 4124 /** 4125 * bond_xmit_hash - generate a hash value based on the xmit policy 4126 * @bond: bonding device 4127 * @skb: buffer to use for headers 4128 * 4129 * This function will extract the necessary headers from the skb buffer and use 4130 * them to generate a hash based on the xmit_policy set in the bonding device 4131 */ 4132 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb) 4133 { 4134 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 && 4135 skb->l4_hash) 4136 return skb->hash; 4137 4138 return __bond_xmit_hash(bond, skb, skb->data, skb->protocol, 4139 skb_mac_offset(skb), skb_network_offset(skb), 4140 skb_headlen(skb)); 4141 } 4142 4143 /** 4144 * bond_xmit_hash_xdp - generate a hash value based on the xmit policy 4145 * @bond: bonding device 4146 * @xdp: buffer to use for headers 4147 * 4148 * The XDP variant of bond_xmit_hash. 4149 */ 4150 static u32 bond_xmit_hash_xdp(struct bonding *bond, struct xdp_buff *xdp) 4151 { 4152 struct ethhdr *eth; 4153 4154 if (xdp->data + sizeof(struct ethhdr) > xdp->data_end) 4155 return 0; 4156 4157 eth = (struct ethhdr *)xdp->data; 4158 4159 return __bond_xmit_hash(bond, NULL, xdp->data, eth->h_proto, 0, 4160 sizeof(struct ethhdr), xdp->data_end - xdp->data); 4161 } 4162 4163 /*-------------------------- Device entry points ----------------------------*/ 4164 4165 void bond_work_init_all(struct bonding *bond) 4166 { 4167 INIT_DELAYED_WORK(&bond->mcast_work, 4168 bond_resend_igmp_join_requests_delayed); 4169 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 4170 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 4171 INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor); 4172 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 4173 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler); 4174 } 4175 4176 static void bond_work_cancel_all(struct bonding *bond) 4177 { 4178 cancel_delayed_work_sync(&bond->mii_work); 4179 cancel_delayed_work_sync(&bond->arp_work); 4180 cancel_delayed_work_sync(&bond->alb_work); 4181 cancel_delayed_work_sync(&bond->ad_work); 4182 cancel_delayed_work_sync(&bond->mcast_work); 4183 cancel_delayed_work_sync(&bond->slave_arr_work); 4184 } 4185 4186 static int bond_open(struct net_device *bond_dev) 4187 { 4188 struct bonding *bond = netdev_priv(bond_dev); 4189 struct list_head *iter; 4190 struct slave *slave; 4191 4192 if (BOND_MODE(bond) == BOND_MODE_ROUNDROBIN && !bond->rr_tx_counter) { 4193 bond->rr_tx_counter = alloc_percpu(u32); 4194 if (!bond->rr_tx_counter) 4195 return -ENOMEM; 4196 } 4197 4198 /* reset slave->backup and slave->inactive */ 4199 if (bond_has_slaves(bond)) { 4200 bond_for_each_slave(bond, slave, iter) { 4201 if (bond_uses_primary(bond) && 4202 slave != rcu_access_pointer(bond->curr_active_slave)) { 4203 bond_set_slave_inactive_flags(slave, 4204 BOND_SLAVE_NOTIFY_NOW); 4205 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) { 4206 bond_set_slave_active_flags(slave, 4207 BOND_SLAVE_NOTIFY_NOW); 4208 } 4209 } 4210 } 4211 4212 if (bond_is_lb(bond)) { 4213 /* bond_alb_initialize must be called before the timer 4214 * is started. 4215 */ 4216 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB))) 4217 return -ENOMEM; 4218 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB) 4219 queue_delayed_work(bond->wq, &bond->alb_work, 0); 4220 } 4221 4222 if (bond->params.miimon) /* link check interval, in milliseconds. */ 4223 queue_delayed_work(bond->wq, &bond->mii_work, 0); 4224 4225 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 4226 queue_delayed_work(bond->wq, &bond->arp_work, 0); 4227 bond->recv_probe = bond_rcv_validate; 4228 } 4229 4230 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 4231 queue_delayed_work(bond->wq, &bond->ad_work, 0); 4232 /* register to receive LACPDUs */ 4233 bond->recv_probe = bond_3ad_lacpdu_recv; 4234 bond_3ad_initiate_agg_selection(bond, 1); 4235 4236 bond_for_each_slave(bond, slave, iter) 4237 dev_mc_add(slave->dev, lacpdu_mcast_addr); 4238 } 4239 4240 if (bond_mode_can_use_xmit_hash(bond)) 4241 bond_update_slave_arr(bond, NULL); 4242 4243 return 0; 4244 } 4245 4246 static int bond_close(struct net_device *bond_dev) 4247 { 4248 struct bonding *bond = netdev_priv(bond_dev); 4249 struct slave *slave; 4250 4251 bond_work_cancel_all(bond); 4252 bond->send_peer_notif = 0; 4253 if (bond_is_lb(bond)) 4254 bond_alb_deinitialize(bond); 4255 bond->recv_probe = NULL; 4256 4257 if (bond_uses_primary(bond)) { 4258 rcu_read_lock(); 4259 slave = rcu_dereference(bond->curr_active_slave); 4260 if (slave) 4261 bond_hw_addr_flush(bond_dev, slave->dev); 4262 rcu_read_unlock(); 4263 } else { 4264 struct list_head *iter; 4265 4266 bond_for_each_slave(bond, slave, iter) 4267 bond_hw_addr_flush(bond_dev, slave->dev); 4268 } 4269 4270 return 0; 4271 } 4272 4273 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but 4274 * that some drivers can provide 32bit values only. 4275 */ 4276 static void bond_fold_stats(struct rtnl_link_stats64 *_res, 4277 const struct rtnl_link_stats64 *_new, 4278 const struct rtnl_link_stats64 *_old) 4279 { 4280 const u64 *new = (const u64 *)_new; 4281 const u64 *old = (const u64 *)_old; 4282 u64 *res = (u64 *)_res; 4283 int i; 4284 4285 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) { 4286 u64 nv = new[i]; 4287 u64 ov = old[i]; 4288 s64 delta = nv - ov; 4289 4290 /* detects if this particular field is 32bit only */ 4291 if (((nv | ov) >> 32) == 0) 4292 delta = (s64)(s32)((u32)nv - (u32)ov); 4293 4294 /* filter anomalies, some drivers reset their stats 4295 * at down/up events. 4296 */ 4297 if (delta > 0) 4298 res[i] += delta; 4299 } 4300 } 4301 4302 #ifdef CONFIG_LOCKDEP 4303 static int bond_get_lowest_level_rcu(struct net_device *dev) 4304 { 4305 struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; 4306 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; 4307 int cur = 0, max = 0; 4308 4309 now = dev; 4310 iter = &dev->adj_list.lower; 4311 4312 while (1) { 4313 next = NULL; 4314 while (1) { 4315 ldev = netdev_next_lower_dev_rcu(now, &iter); 4316 if (!ldev) 4317 break; 4318 4319 next = ldev; 4320 niter = &ldev->adj_list.lower; 4321 dev_stack[cur] = now; 4322 iter_stack[cur++] = iter; 4323 if (max <= cur) 4324 max = cur; 4325 break; 4326 } 4327 4328 if (!next) { 4329 if (!cur) 4330 return max; 4331 next = dev_stack[--cur]; 4332 niter = iter_stack[cur]; 4333 } 4334 4335 now = next; 4336 iter = niter; 4337 } 4338 4339 return max; 4340 } 4341 #endif 4342 4343 static void bond_get_stats(struct net_device *bond_dev, 4344 struct rtnl_link_stats64 *stats) 4345 { 4346 struct bonding *bond = netdev_priv(bond_dev); 4347 struct rtnl_link_stats64 temp; 4348 struct list_head *iter; 4349 struct slave *slave; 4350 int nest_level = 0; 4351 4352 4353 rcu_read_lock(); 4354 #ifdef CONFIG_LOCKDEP 4355 nest_level = bond_get_lowest_level_rcu(bond_dev); 4356 #endif 4357 4358 spin_lock_nested(&bond->stats_lock, nest_level); 4359 memcpy(stats, &bond->bond_stats, sizeof(*stats)); 4360 4361 bond_for_each_slave_rcu(bond, slave, iter) { 4362 const struct rtnl_link_stats64 *new = 4363 dev_get_stats(slave->dev, &temp); 4364 4365 bond_fold_stats(stats, new, &slave->slave_stats); 4366 4367 /* save off the slave stats for the next run */ 4368 memcpy(&slave->slave_stats, new, sizeof(*new)); 4369 } 4370 4371 memcpy(&bond->bond_stats, stats, sizeof(*stats)); 4372 spin_unlock(&bond->stats_lock); 4373 rcu_read_unlock(); 4374 } 4375 4376 static int bond_eth_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 4377 { 4378 struct bonding *bond = netdev_priv(bond_dev); 4379 struct mii_ioctl_data *mii = NULL; 4380 const struct net_device_ops *ops; 4381 struct net_device *real_dev; 4382 struct hwtstamp_config cfg; 4383 struct ifreq ifrr; 4384 int res = 0; 4385 4386 netdev_dbg(bond_dev, "bond_eth_ioctl: cmd=%d\n", cmd); 4387 4388 switch (cmd) { 4389 case SIOCGMIIPHY: 4390 mii = if_mii(ifr); 4391 if (!mii) 4392 return -EINVAL; 4393 4394 mii->phy_id = 0; 4395 fallthrough; 4396 case SIOCGMIIREG: 4397 /* We do this again just in case we were called by SIOCGMIIREG 4398 * instead of SIOCGMIIPHY. 4399 */ 4400 mii = if_mii(ifr); 4401 if (!mii) 4402 return -EINVAL; 4403 4404 if (mii->reg_num == 1) { 4405 mii->val_out = 0; 4406 if (netif_carrier_ok(bond->dev)) 4407 mii->val_out = BMSR_LSTATUS; 4408 } 4409 4410 break; 4411 case SIOCSHWTSTAMP: 4412 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) 4413 return -EFAULT; 4414 4415 if (!(cfg.flags & HWTSTAMP_FLAG_BONDED_PHC_INDEX)) 4416 return -EOPNOTSUPP; 4417 4418 fallthrough; 4419 case SIOCGHWTSTAMP: 4420 real_dev = bond_option_active_slave_get_rcu(bond); 4421 if (!real_dev) 4422 return -EOPNOTSUPP; 4423 4424 strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ); 4425 ifrr.ifr_ifru = ifr->ifr_ifru; 4426 4427 ops = real_dev->netdev_ops; 4428 if (netif_device_present(real_dev) && ops->ndo_eth_ioctl) { 4429 res = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd); 4430 if (res) 4431 return res; 4432 4433 ifr->ifr_ifru = ifrr.ifr_ifru; 4434 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) 4435 return -EFAULT; 4436 4437 /* Set the BOND_PHC_INDEX flag to notify user space */ 4438 cfg.flags |= HWTSTAMP_FLAG_BONDED_PHC_INDEX; 4439 4440 return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? 4441 -EFAULT : 0; 4442 } 4443 fallthrough; 4444 default: 4445 res = -EOPNOTSUPP; 4446 } 4447 4448 return res; 4449 } 4450 4451 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 4452 { 4453 struct bonding *bond = netdev_priv(bond_dev); 4454 struct net_device *slave_dev = NULL; 4455 struct ifbond k_binfo; 4456 struct ifbond __user *u_binfo = NULL; 4457 struct ifslave k_sinfo; 4458 struct ifslave __user *u_sinfo = NULL; 4459 struct bond_opt_value newval; 4460 struct net *net; 4461 int res = 0; 4462 4463 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd); 4464 4465 switch (cmd) { 4466 case SIOCBONDINFOQUERY: 4467 u_binfo = (struct ifbond __user *)ifr->ifr_data; 4468 4469 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 4470 return -EFAULT; 4471 4472 bond_info_query(bond_dev, &k_binfo); 4473 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 4474 return -EFAULT; 4475 4476 return 0; 4477 case SIOCBONDSLAVEINFOQUERY: 4478 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 4479 4480 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 4481 return -EFAULT; 4482 4483 res = bond_slave_info_query(bond_dev, &k_sinfo); 4484 if (res == 0 && 4485 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 4486 return -EFAULT; 4487 4488 return res; 4489 default: 4490 break; 4491 } 4492 4493 net = dev_net(bond_dev); 4494 4495 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 4496 return -EPERM; 4497 4498 slave_dev = __dev_get_by_name(net, ifr->ifr_slave); 4499 4500 slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev); 4501 4502 if (!slave_dev) 4503 return -ENODEV; 4504 4505 switch (cmd) { 4506 case SIOCBONDENSLAVE: 4507 res = bond_enslave(bond_dev, slave_dev, NULL); 4508 break; 4509 case SIOCBONDRELEASE: 4510 res = bond_release(bond_dev, slave_dev); 4511 break; 4512 case SIOCBONDSETHWADDR: 4513 res = bond_set_dev_addr(bond_dev, slave_dev); 4514 break; 4515 case SIOCBONDCHANGEACTIVE: 4516 bond_opt_initstr(&newval, slave_dev->name); 4517 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE, 4518 &newval); 4519 break; 4520 default: 4521 res = -EOPNOTSUPP; 4522 } 4523 4524 return res; 4525 } 4526 4527 static int bond_siocdevprivate(struct net_device *bond_dev, struct ifreq *ifr, 4528 void __user *data, int cmd) 4529 { 4530 struct ifreq ifrdata = { .ifr_data = data }; 4531 4532 switch (cmd) { 4533 case BOND_INFO_QUERY_OLD: 4534 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDINFOQUERY); 4535 case BOND_SLAVE_INFO_QUERY_OLD: 4536 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDSLAVEINFOQUERY); 4537 case BOND_ENSLAVE_OLD: 4538 return bond_do_ioctl(bond_dev, ifr, SIOCBONDENSLAVE); 4539 case BOND_RELEASE_OLD: 4540 return bond_do_ioctl(bond_dev, ifr, SIOCBONDRELEASE); 4541 case BOND_SETHWADDR_OLD: 4542 return bond_do_ioctl(bond_dev, ifr, SIOCBONDSETHWADDR); 4543 case BOND_CHANGE_ACTIVE_OLD: 4544 return bond_do_ioctl(bond_dev, ifr, SIOCBONDCHANGEACTIVE); 4545 } 4546 4547 return -EOPNOTSUPP; 4548 } 4549 4550 static void bond_change_rx_flags(struct net_device *bond_dev, int change) 4551 { 4552 struct bonding *bond = netdev_priv(bond_dev); 4553 4554 if (change & IFF_PROMISC) 4555 bond_set_promiscuity(bond, 4556 bond_dev->flags & IFF_PROMISC ? 1 : -1); 4557 4558 if (change & IFF_ALLMULTI) 4559 bond_set_allmulti(bond, 4560 bond_dev->flags & IFF_ALLMULTI ? 1 : -1); 4561 } 4562 4563 static void bond_set_rx_mode(struct net_device *bond_dev) 4564 { 4565 struct bonding *bond = netdev_priv(bond_dev); 4566 struct list_head *iter; 4567 struct slave *slave; 4568 4569 rcu_read_lock(); 4570 if (bond_uses_primary(bond)) { 4571 slave = rcu_dereference(bond->curr_active_slave); 4572 if (slave) { 4573 dev_uc_sync(slave->dev, bond_dev); 4574 dev_mc_sync(slave->dev, bond_dev); 4575 } 4576 } else { 4577 bond_for_each_slave_rcu(bond, slave, iter) { 4578 dev_uc_sync_multiple(slave->dev, bond_dev); 4579 dev_mc_sync_multiple(slave->dev, bond_dev); 4580 } 4581 } 4582 rcu_read_unlock(); 4583 } 4584 4585 static int bond_neigh_init(struct neighbour *n) 4586 { 4587 struct bonding *bond = netdev_priv(n->dev); 4588 const struct net_device_ops *slave_ops; 4589 struct neigh_parms parms; 4590 struct slave *slave; 4591 int ret = 0; 4592 4593 rcu_read_lock(); 4594 slave = bond_first_slave_rcu(bond); 4595 if (!slave) 4596 goto out; 4597 slave_ops = slave->dev->netdev_ops; 4598 if (!slave_ops->ndo_neigh_setup) 4599 goto out; 4600 4601 /* TODO: find another way [1] to implement this. 4602 * Passing a zeroed structure is fragile, 4603 * but at least we do not pass garbage. 4604 * 4605 * [1] One way would be that ndo_neigh_setup() never touch 4606 * struct neigh_parms, but propagate the new neigh_setup() 4607 * back to ___neigh_create() / neigh_parms_alloc() 4608 */ 4609 memset(&parms, 0, sizeof(parms)); 4610 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); 4611 4612 if (ret) 4613 goto out; 4614 4615 if (parms.neigh_setup) 4616 ret = parms.neigh_setup(n); 4617 out: 4618 rcu_read_unlock(); 4619 return ret; 4620 } 4621 4622 /* The bonding ndo_neigh_setup is called at init time beofre any 4623 * slave exists. So we must declare proxy setup function which will 4624 * be used at run time to resolve the actual slave neigh param setup. 4625 * 4626 * It's also called by master devices (such as vlans) to setup their 4627 * underlying devices. In that case - do nothing, we're already set up from 4628 * our init. 4629 */ 4630 static int bond_neigh_setup(struct net_device *dev, 4631 struct neigh_parms *parms) 4632 { 4633 /* modify only our neigh_parms */ 4634 if (parms->dev == dev) 4635 parms->neigh_setup = bond_neigh_init; 4636 4637 return 0; 4638 } 4639 4640 /* Change the MTU of all of a master's slaves to match the master */ 4641 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 4642 { 4643 struct bonding *bond = netdev_priv(bond_dev); 4644 struct slave *slave, *rollback_slave; 4645 struct list_head *iter; 4646 int res = 0; 4647 4648 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu); 4649 4650 bond_for_each_slave(bond, slave, iter) { 4651 slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n", 4652 slave, slave->dev->netdev_ops->ndo_change_mtu); 4653 4654 res = dev_set_mtu(slave->dev, new_mtu); 4655 4656 if (res) { 4657 /* If we failed to set the slave's mtu to the new value 4658 * we must abort the operation even in ACTIVE_BACKUP 4659 * mode, because if we allow the backup slaves to have 4660 * different mtu values than the active slave we'll 4661 * need to change their mtu when doing a failover. That 4662 * means changing their mtu from timer context, which 4663 * is probably not a good idea. 4664 */ 4665 slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n", 4666 res, new_mtu); 4667 goto unwind; 4668 } 4669 } 4670 4671 bond_dev->mtu = new_mtu; 4672 4673 return 0; 4674 4675 unwind: 4676 /* unwind from head to the slave that failed */ 4677 bond_for_each_slave(bond, rollback_slave, iter) { 4678 int tmp_res; 4679 4680 if (rollback_slave == slave) 4681 break; 4682 4683 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu); 4684 if (tmp_res) 4685 slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n", 4686 tmp_res); 4687 } 4688 4689 return res; 4690 } 4691 4692 /* Change HW address 4693 * 4694 * Note that many devices must be down to change the HW address, and 4695 * downing the master releases all slaves. We can make bonds full of 4696 * bonding devices to test this, however. 4697 */ 4698 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 4699 { 4700 struct bonding *bond = netdev_priv(bond_dev); 4701 struct slave *slave, *rollback_slave; 4702 struct sockaddr_storage *ss = addr, tmp_ss; 4703 struct list_head *iter; 4704 int res = 0; 4705 4706 if (BOND_MODE(bond) == BOND_MODE_ALB) 4707 return bond_alb_set_mac_address(bond_dev, addr); 4708 4709 4710 netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond); 4711 4712 /* If fail_over_mac is enabled, do nothing and return success. 4713 * Returning an error causes ifenslave to fail. 4714 */ 4715 if (bond->params.fail_over_mac && 4716 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 4717 return 0; 4718 4719 if (!is_valid_ether_addr(ss->__data)) 4720 return -EADDRNOTAVAIL; 4721 4722 bond_for_each_slave(bond, slave, iter) { 4723 slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n", 4724 __func__, slave); 4725 res = dev_set_mac_address(slave->dev, addr, NULL); 4726 if (res) { 4727 /* TODO: consider downing the slave 4728 * and retry ? 4729 * User should expect communications 4730 * breakage anyway until ARP finish 4731 * updating, so... 4732 */ 4733 slave_dbg(bond_dev, slave->dev, "%s: err %d\n", 4734 __func__, res); 4735 goto unwind; 4736 } 4737 } 4738 4739 /* success */ 4740 dev_addr_set(bond_dev, ss->__data); 4741 return 0; 4742 4743 unwind: 4744 memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 4745 tmp_ss.ss_family = bond_dev->type; 4746 4747 /* unwind from head to the slave that failed */ 4748 bond_for_each_slave(bond, rollback_slave, iter) { 4749 int tmp_res; 4750 4751 if (rollback_slave == slave) 4752 break; 4753 4754 tmp_res = dev_set_mac_address(rollback_slave->dev, 4755 (struct sockaddr *)&tmp_ss, NULL); 4756 if (tmp_res) { 4757 slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n", 4758 __func__, tmp_res); 4759 } 4760 } 4761 4762 return res; 4763 } 4764 4765 /** 4766 * bond_get_slave_by_id - get xmit slave with slave_id 4767 * @bond: bonding device that is transmitting 4768 * @slave_id: slave id up to slave_cnt-1 through which to transmit 4769 * 4770 * This function tries to get slave with slave_id but in case 4771 * it fails, it tries to find the first available slave for transmission. 4772 */ 4773 static struct slave *bond_get_slave_by_id(struct bonding *bond, 4774 int slave_id) 4775 { 4776 struct list_head *iter; 4777 struct slave *slave; 4778 int i = slave_id; 4779 4780 /* Here we start from the slave with slave_id */ 4781 bond_for_each_slave_rcu(bond, slave, iter) { 4782 if (--i < 0) { 4783 if (bond_slave_can_tx(slave)) 4784 return slave; 4785 } 4786 } 4787 4788 /* Here we start from the first slave up to slave_id */ 4789 i = slave_id; 4790 bond_for_each_slave_rcu(bond, slave, iter) { 4791 if (--i < 0) 4792 break; 4793 if (bond_slave_can_tx(slave)) 4794 return slave; 4795 } 4796 /* no slave that can tx has been found */ 4797 return NULL; 4798 } 4799 4800 /** 4801 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave 4802 * @bond: bonding device to use 4803 * 4804 * Based on the value of the bonding device's packets_per_slave parameter 4805 * this function generates a slave id, which is usually used as the next 4806 * slave to transmit through. 4807 */ 4808 static u32 bond_rr_gen_slave_id(struct bonding *bond) 4809 { 4810 u32 slave_id; 4811 struct reciprocal_value reciprocal_packets_per_slave; 4812 int packets_per_slave = bond->params.packets_per_slave; 4813 4814 switch (packets_per_slave) { 4815 case 0: 4816 slave_id = get_random_u32(); 4817 break; 4818 case 1: 4819 slave_id = this_cpu_inc_return(*bond->rr_tx_counter); 4820 break; 4821 default: 4822 reciprocal_packets_per_slave = 4823 bond->params.reciprocal_packets_per_slave; 4824 slave_id = this_cpu_inc_return(*bond->rr_tx_counter); 4825 slave_id = reciprocal_divide(slave_id, 4826 reciprocal_packets_per_slave); 4827 break; 4828 } 4829 4830 return slave_id; 4831 } 4832 4833 static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond, 4834 struct sk_buff *skb) 4835 { 4836 struct slave *slave; 4837 int slave_cnt; 4838 u32 slave_id; 4839 4840 /* Start with the curr_active_slave that joined the bond as the 4841 * default for sending IGMP traffic. For failover purposes one 4842 * needs to maintain some consistency for the interface that will 4843 * send the join/membership reports. The curr_active_slave found 4844 * will send all of this type of traffic. 4845 */ 4846 if (skb->protocol == htons(ETH_P_IP)) { 4847 int noff = skb_network_offset(skb); 4848 struct iphdr *iph; 4849 4850 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph)))) 4851 goto non_igmp; 4852 4853 iph = ip_hdr(skb); 4854 if (iph->protocol == IPPROTO_IGMP) { 4855 slave = rcu_dereference(bond->curr_active_slave); 4856 if (slave) 4857 return slave; 4858 return bond_get_slave_by_id(bond, 0); 4859 } 4860 } 4861 4862 non_igmp: 4863 slave_cnt = READ_ONCE(bond->slave_cnt); 4864 if (likely(slave_cnt)) { 4865 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt; 4866 return bond_get_slave_by_id(bond, slave_id); 4867 } 4868 return NULL; 4869 } 4870 4871 static struct slave *bond_xdp_xmit_roundrobin_slave_get(struct bonding *bond, 4872 struct xdp_buff *xdp) 4873 { 4874 struct slave *slave; 4875 int slave_cnt; 4876 u32 slave_id; 4877 const struct ethhdr *eth; 4878 void *data = xdp->data; 4879 4880 if (data + sizeof(struct ethhdr) > xdp->data_end) 4881 goto non_igmp; 4882 4883 eth = (struct ethhdr *)data; 4884 data += sizeof(struct ethhdr); 4885 4886 /* See comment on IGMP in bond_xmit_roundrobin_slave_get() */ 4887 if (eth->h_proto == htons(ETH_P_IP)) { 4888 const struct iphdr *iph; 4889 4890 if (data + sizeof(struct iphdr) > xdp->data_end) 4891 goto non_igmp; 4892 4893 iph = (struct iphdr *)data; 4894 4895 if (iph->protocol == IPPROTO_IGMP) { 4896 slave = rcu_dereference(bond->curr_active_slave); 4897 if (slave) 4898 return slave; 4899 return bond_get_slave_by_id(bond, 0); 4900 } 4901 } 4902 4903 non_igmp: 4904 slave_cnt = READ_ONCE(bond->slave_cnt); 4905 if (likely(slave_cnt)) { 4906 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt; 4907 return bond_get_slave_by_id(bond, slave_id); 4908 } 4909 return NULL; 4910 } 4911 4912 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb, 4913 struct net_device *bond_dev) 4914 { 4915 struct bonding *bond = netdev_priv(bond_dev); 4916 struct slave *slave; 4917 4918 slave = bond_xmit_roundrobin_slave_get(bond, skb); 4919 if (likely(slave)) 4920 return bond_dev_queue_xmit(bond, skb, slave->dev); 4921 4922 return bond_tx_drop(bond_dev, skb); 4923 } 4924 4925 static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond) 4926 { 4927 return rcu_dereference(bond->curr_active_slave); 4928 } 4929 4930 /* In active-backup mode, we know that bond->curr_active_slave is always valid if 4931 * the bond has a usable interface. 4932 */ 4933 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb, 4934 struct net_device *bond_dev) 4935 { 4936 struct bonding *bond = netdev_priv(bond_dev); 4937 struct slave *slave; 4938 4939 slave = bond_xmit_activebackup_slave_get(bond); 4940 if (slave) 4941 return bond_dev_queue_xmit(bond, skb, slave->dev); 4942 4943 return bond_tx_drop(bond_dev, skb); 4944 } 4945 4946 /* Use this to update slave_array when (a) it's not appropriate to update 4947 * slave_array right away (note that update_slave_array() may sleep) 4948 * and / or (b) RTNL is not held. 4949 */ 4950 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay) 4951 { 4952 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay); 4953 } 4954 4955 /* Slave array work handler. Holds only RTNL */ 4956 static void bond_slave_arr_handler(struct work_struct *work) 4957 { 4958 struct bonding *bond = container_of(work, struct bonding, 4959 slave_arr_work.work); 4960 int ret; 4961 4962 if (!rtnl_trylock()) 4963 goto err; 4964 4965 ret = bond_update_slave_arr(bond, NULL); 4966 rtnl_unlock(); 4967 if (ret) { 4968 pr_warn_ratelimited("Failed to update slave array from WT\n"); 4969 goto err; 4970 } 4971 return; 4972 4973 err: 4974 bond_slave_arr_work_rearm(bond, 1); 4975 } 4976 4977 static void bond_skip_slave(struct bond_up_slave *slaves, 4978 struct slave *skipslave) 4979 { 4980 int idx; 4981 4982 /* Rare situation where caller has asked to skip a specific 4983 * slave but allocation failed (most likely!). BTW this is 4984 * only possible when the call is initiated from 4985 * __bond_release_one(). In this situation; overwrite the 4986 * skipslave entry in the array with the last entry from the 4987 * array to avoid a situation where the xmit path may choose 4988 * this to-be-skipped slave to send a packet out. 4989 */ 4990 for (idx = 0; slaves && idx < slaves->count; idx++) { 4991 if (skipslave == slaves->arr[idx]) { 4992 slaves->arr[idx] = 4993 slaves->arr[slaves->count - 1]; 4994 slaves->count--; 4995 break; 4996 } 4997 } 4998 } 4999 5000 static void bond_set_slave_arr(struct bonding *bond, 5001 struct bond_up_slave *usable_slaves, 5002 struct bond_up_slave *all_slaves) 5003 { 5004 struct bond_up_slave *usable, *all; 5005 5006 usable = rtnl_dereference(bond->usable_slaves); 5007 rcu_assign_pointer(bond->usable_slaves, usable_slaves); 5008 kfree_rcu(usable, rcu); 5009 5010 all = rtnl_dereference(bond->all_slaves); 5011 rcu_assign_pointer(bond->all_slaves, all_slaves); 5012 kfree_rcu(all, rcu); 5013 } 5014 5015 static void bond_reset_slave_arr(struct bonding *bond) 5016 { 5017 struct bond_up_slave *usable, *all; 5018 5019 usable = rtnl_dereference(bond->usable_slaves); 5020 if (usable) { 5021 RCU_INIT_POINTER(bond->usable_slaves, NULL); 5022 kfree_rcu(usable, rcu); 5023 } 5024 5025 all = rtnl_dereference(bond->all_slaves); 5026 if (all) { 5027 RCU_INIT_POINTER(bond->all_slaves, NULL); 5028 kfree_rcu(all, rcu); 5029 } 5030 } 5031 5032 /* Build the usable slaves array in control path for modes that use xmit-hash 5033 * to determine the slave interface - 5034 * (a) BOND_MODE_8023AD 5035 * (b) BOND_MODE_XOR 5036 * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0 5037 * 5038 * The caller is expected to hold RTNL only and NO other lock! 5039 */ 5040 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave) 5041 { 5042 struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL; 5043 struct slave *slave; 5044 struct list_head *iter; 5045 int agg_id = 0; 5046 int ret = 0; 5047 5048 might_sleep(); 5049 5050 usable_slaves = kzalloc(struct_size(usable_slaves, arr, 5051 bond->slave_cnt), GFP_KERNEL); 5052 all_slaves = kzalloc(struct_size(all_slaves, arr, 5053 bond->slave_cnt), GFP_KERNEL); 5054 if (!usable_slaves || !all_slaves) { 5055 ret = -ENOMEM; 5056 goto out; 5057 } 5058 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 5059 struct ad_info ad_info; 5060 5061 spin_lock_bh(&bond->mode_lock); 5062 if (bond_3ad_get_active_agg_info(bond, &ad_info)) { 5063 spin_unlock_bh(&bond->mode_lock); 5064 pr_debug("bond_3ad_get_active_agg_info failed\n"); 5065 /* No active aggragator means it's not safe to use 5066 * the previous array. 5067 */ 5068 bond_reset_slave_arr(bond); 5069 goto out; 5070 } 5071 spin_unlock_bh(&bond->mode_lock); 5072 agg_id = ad_info.aggregator_id; 5073 } 5074 bond_for_each_slave(bond, slave, iter) { 5075 if (skipslave == slave) 5076 continue; 5077 5078 all_slaves->arr[all_slaves->count++] = slave; 5079 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 5080 struct aggregator *agg; 5081 5082 agg = SLAVE_AD_INFO(slave)->port.aggregator; 5083 if (!agg || agg->aggregator_identifier != agg_id) 5084 continue; 5085 } 5086 if (!bond_slave_can_tx(slave)) 5087 continue; 5088 5089 slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n", 5090 usable_slaves->count); 5091 5092 usable_slaves->arr[usable_slaves->count++] = slave; 5093 } 5094 5095 bond_set_slave_arr(bond, usable_slaves, all_slaves); 5096 return ret; 5097 out: 5098 if (ret != 0 && skipslave) { 5099 bond_skip_slave(rtnl_dereference(bond->all_slaves), 5100 skipslave); 5101 bond_skip_slave(rtnl_dereference(bond->usable_slaves), 5102 skipslave); 5103 } 5104 kfree_rcu(all_slaves, rcu); 5105 kfree_rcu(usable_slaves, rcu); 5106 5107 return ret; 5108 } 5109 5110 static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond, 5111 struct sk_buff *skb, 5112 struct bond_up_slave *slaves) 5113 { 5114 struct slave *slave; 5115 unsigned int count; 5116 u32 hash; 5117 5118 hash = bond_xmit_hash(bond, skb); 5119 count = slaves ? READ_ONCE(slaves->count) : 0; 5120 if (unlikely(!count)) 5121 return NULL; 5122 5123 slave = slaves->arr[hash % count]; 5124 return slave; 5125 } 5126 5127 static struct slave *bond_xdp_xmit_3ad_xor_slave_get(struct bonding *bond, 5128 struct xdp_buff *xdp) 5129 { 5130 struct bond_up_slave *slaves; 5131 unsigned int count; 5132 u32 hash; 5133 5134 hash = bond_xmit_hash_xdp(bond, xdp); 5135 slaves = rcu_dereference(bond->usable_slaves); 5136 count = slaves ? READ_ONCE(slaves->count) : 0; 5137 if (unlikely(!count)) 5138 return NULL; 5139 5140 return slaves->arr[hash % count]; 5141 } 5142 5143 /* Use this Xmit function for 3AD as well as XOR modes. The current 5144 * usable slave array is formed in the control path. The xmit function 5145 * just calculates hash and sends the packet out. 5146 */ 5147 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb, 5148 struct net_device *dev) 5149 { 5150 struct bonding *bond = netdev_priv(dev); 5151 struct bond_up_slave *slaves; 5152 struct slave *slave; 5153 5154 slaves = rcu_dereference(bond->usable_slaves); 5155 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves); 5156 if (likely(slave)) 5157 return bond_dev_queue_xmit(bond, skb, slave->dev); 5158 5159 return bond_tx_drop(dev, skb); 5160 } 5161 5162 /* in broadcast mode, we send everything to all usable interfaces. */ 5163 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb, 5164 struct net_device *bond_dev) 5165 { 5166 struct bonding *bond = netdev_priv(bond_dev); 5167 struct slave *slave = NULL; 5168 struct list_head *iter; 5169 bool xmit_suc = false; 5170 bool skb_used = false; 5171 5172 bond_for_each_slave_rcu(bond, slave, iter) { 5173 struct sk_buff *skb2; 5174 5175 if (!(bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)) 5176 continue; 5177 5178 if (bond_is_last_slave(bond, slave)) { 5179 skb2 = skb; 5180 skb_used = true; 5181 } else { 5182 skb2 = skb_clone(skb, GFP_ATOMIC); 5183 if (!skb2) { 5184 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n", 5185 bond_dev->name, __func__); 5186 continue; 5187 } 5188 } 5189 5190 if (bond_dev_queue_xmit(bond, skb2, slave->dev) == NETDEV_TX_OK) 5191 xmit_suc = true; 5192 } 5193 5194 if (!skb_used) 5195 dev_kfree_skb_any(skb); 5196 5197 if (xmit_suc) 5198 return NETDEV_TX_OK; 5199 5200 dev_core_stats_tx_dropped_inc(bond_dev); 5201 return NET_XMIT_DROP; 5202 } 5203 5204 /*------------------------- Device initialization ---------------------------*/ 5205 5206 /* Lookup the slave that corresponds to a qid */ 5207 static inline int bond_slave_override(struct bonding *bond, 5208 struct sk_buff *skb) 5209 { 5210 struct slave *slave = NULL; 5211 struct list_head *iter; 5212 5213 if (!skb_rx_queue_recorded(skb)) 5214 return 1; 5215 5216 /* Find out if any slaves have the same mapping as this skb. */ 5217 bond_for_each_slave_rcu(bond, slave, iter) { 5218 if (slave->queue_id == skb_get_queue_mapping(skb)) { 5219 if (bond_slave_is_up(slave) && 5220 slave->link == BOND_LINK_UP) { 5221 bond_dev_queue_xmit(bond, skb, slave->dev); 5222 return 0; 5223 } 5224 /* If the slave isn't UP, use default transmit policy. */ 5225 break; 5226 } 5227 } 5228 5229 return 1; 5230 } 5231 5232 5233 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb, 5234 struct net_device *sb_dev) 5235 { 5236 /* This helper function exists to help dev_pick_tx get the correct 5237 * destination queue. Using a helper function skips a call to 5238 * skb_tx_hash and will put the skbs in the queue we expect on their 5239 * way down to the bonding driver. 5240 */ 5241 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 5242 5243 /* Save the original txq to restore before passing to the driver */ 5244 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb); 5245 5246 if (unlikely(txq >= dev->real_num_tx_queues)) { 5247 do { 5248 txq -= dev->real_num_tx_queues; 5249 } while (txq >= dev->real_num_tx_queues); 5250 } 5251 return txq; 5252 } 5253 5254 static struct net_device *bond_xmit_get_slave(struct net_device *master_dev, 5255 struct sk_buff *skb, 5256 bool all_slaves) 5257 { 5258 struct bonding *bond = netdev_priv(master_dev); 5259 struct bond_up_slave *slaves; 5260 struct slave *slave = NULL; 5261 5262 switch (BOND_MODE(bond)) { 5263 case BOND_MODE_ROUNDROBIN: 5264 slave = bond_xmit_roundrobin_slave_get(bond, skb); 5265 break; 5266 case BOND_MODE_ACTIVEBACKUP: 5267 slave = bond_xmit_activebackup_slave_get(bond); 5268 break; 5269 case BOND_MODE_8023AD: 5270 case BOND_MODE_XOR: 5271 if (all_slaves) 5272 slaves = rcu_dereference(bond->all_slaves); 5273 else 5274 slaves = rcu_dereference(bond->usable_slaves); 5275 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves); 5276 break; 5277 case BOND_MODE_BROADCAST: 5278 break; 5279 case BOND_MODE_ALB: 5280 slave = bond_xmit_alb_slave_get(bond, skb); 5281 break; 5282 case BOND_MODE_TLB: 5283 slave = bond_xmit_tlb_slave_get(bond, skb); 5284 break; 5285 default: 5286 /* Should never happen, mode already checked */ 5287 WARN_ONCE(true, "Unknown bonding mode"); 5288 break; 5289 } 5290 5291 if (slave) 5292 return slave->dev; 5293 return NULL; 5294 } 5295 5296 static void bond_sk_to_flow(struct sock *sk, struct flow_keys *flow) 5297 { 5298 switch (sk->sk_family) { 5299 #if IS_ENABLED(CONFIG_IPV6) 5300 case AF_INET6: 5301 if (ipv6_only_sock(sk) || 5302 ipv6_addr_type(&sk->sk_v6_daddr) != IPV6_ADDR_MAPPED) { 5303 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; 5304 flow->addrs.v6addrs.src = inet6_sk(sk)->saddr; 5305 flow->addrs.v6addrs.dst = sk->sk_v6_daddr; 5306 break; 5307 } 5308 fallthrough; 5309 #endif 5310 default: /* AF_INET */ 5311 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; 5312 flow->addrs.v4addrs.src = inet_sk(sk)->inet_rcv_saddr; 5313 flow->addrs.v4addrs.dst = inet_sk(sk)->inet_daddr; 5314 break; 5315 } 5316 5317 flow->ports.src = inet_sk(sk)->inet_sport; 5318 flow->ports.dst = inet_sk(sk)->inet_dport; 5319 } 5320 5321 /** 5322 * bond_sk_hash_l34 - generate a hash value based on the socket's L3 and L4 fields 5323 * @sk: socket to use for headers 5324 * 5325 * This function will extract the necessary field from the socket and use 5326 * them to generate a hash based on the LAYER34 xmit_policy. 5327 * Assumes that sk is a TCP or UDP socket. 5328 */ 5329 static u32 bond_sk_hash_l34(struct sock *sk) 5330 { 5331 struct flow_keys flow; 5332 u32 hash; 5333 5334 bond_sk_to_flow(sk, &flow); 5335 5336 /* L4 */ 5337 memcpy(&hash, &flow.ports.ports, sizeof(hash)); 5338 /* L3 */ 5339 return bond_ip_hash(hash, &flow, BOND_XMIT_POLICY_LAYER34); 5340 } 5341 5342 static struct net_device *__bond_sk_get_lower_dev(struct bonding *bond, 5343 struct sock *sk) 5344 { 5345 struct bond_up_slave *slaves; 5346 struct slave *slave; 5347 unsigned int count; 5348 u32 hash; 5349 5350 slaves = rcu_dereference(bond->usable_slaves); 5351 count = slaves ? READ_ONCE(slaves->count) : 0; 5352 if (unlikely(!count)) 5353 return NULL; 5354 5355 hash = bond_sk_hash_l34(sk); 5356 slave = slaves->arr[hash % count]; 5357 5358 return slave->dev; 5359 } 5360 5361 static struct net_device *bond_sk_get_lower_dev(struct net_device *dev, 5362 struct sock *sk) 5363 { 5364 struct bonding *bond = netdev_priv(dev); 5365 struct net_device *lower = NULL; 5366 5367 rcu_read_lock(); 5368 if (bond_sk_check(bond)) 5369 lower = __bond_sk_get_lower_dev(bond, sk); 5370 rcu_read_unlock(); 5371 5372 return lower; 5373 } 5374 5375 #if IS_ENABLED(CONFIG_TLS_DEVICE) 5376 static netdev_tx_t bond_tls_device_xmit(struct bonding *bond, struct sk_buff *skb, 5377 struct net_device *dev) 5378 { 5379 struct net_device *tls_netdev = rcu_dereference(tls_get_ctx(skb->sk)->netdev); 5380 5381 /* tls_netdev might become NULL, even if tls_is_sk_tx_device_offloaded 5382 * was true, if tls_device_down is running in parallel, but it's OK, 5383 * because bond_get_slave_by_dev has a NULL check. 5384 */ 5385 if (likely(bond_get_slave_by_dev(bond, tls_netdev))) 5386 return bond_dev_queue_xmit(bond, skb, tls_netdev); 5387 return bond_tx_drop(dev, skb); 5388 } 5389 #endif 5390 5391 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 5392 { 5393 struct bonding *bond = netdev_priv(dev); 5394 5395 if (bond_should_override_tx_queue(bond) && 5396 !bond_slave_override(bond, skb)) 5397 return NETDEV_TX_OK; 5398 5399 #if IS_ENABLED(CONFIG_TLS_DEVICE) 5400 if (skb->sk && tls_is_sk_tx_device_offloaded(skb->sk)) 5401 return bond_tls_device_xmit(bond, skb, dev); 5402 #endif 5403 5404 switch (BOND_MODE(bond)) { 5405 case BOND_MODE_ROUNDROBIN: 5406 return bond_xmit_roundrobin(skb, dev); 5407 case BOND_MODE_ACTIVEBACKUP: 5408 return bond_xmit_activebackup(skb, dev); 5409 case BOND_MODE_8023AD: 5410 case BOND_MODE_XOR: 5411 return bond_3ad_xor_xmit(skb, dev); 5412 case BOND_MODE_BROADCAST: 5413 return bond_xmit_broadcast(skb, dev); 5414 case BOND_MODE_ALB: 5415 return bond_alb_xmit(skb, dev); 5416 case BOND_MODE_TLB: 5417 return bond_tlb_xmit(skb, dev); 5418 default: 5419 /* Should never happen, mode already checked */ 5420 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond)); 5421 WARN_ON_ONCE(1); 5422 return bond_tx_drop(dev, skb); 5423 } 5424 } 5425 5426 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 5427 { 5428 struct bonding *bond = netdev_priv(dev); 5429 netdev_tx_t ret = NETDEV_TX_OK; 5430 5431 /* If we risk deadlock from transmitting this in the 5432 * netpoll path, tell netpoll to queue the frame for later tx 5433 */ 5434 if (unlikely(is_netpoll_tx_blocked(dev))) 5435 return NETDEV_TX_BUSY; 5436 5437 rcu_read_lock(); 5438 if (bond_has_slaves(bond)) 5439 ret = __bond_start_xmit(skb, dev); 5440 else 5441 ret = bond_tx_drop(dev, skb); 5442 rcu_read_unlock(); 5443 5444 return ret; 5445 } 5446 5447 static struct net_device * 5448 bond_xdp_get_xmit_slave(struct net_device *bond_dev, struct xdp_buff *xdp) 5449 { 5450 struct bonding *bond = netdev_priv(bond_dev); 5451 struct slave *slave; 5452 5453 /* Caller needs to hold rcu_read_lock() */ 5454 5455 switch (BOND_MODE(bond)) { 5456 case BOND_MODE_ROUNDROBIN: 5457 slave = bond_xdp_xmit_roundrobin_slave_get(bond, xdp); 5458 break; 5459 5460 case BOND_MODE_ACTIVEBACKUP: 5461 slave = bond_xmit_activebackup_slave_get(bond); 5462 break; 5463 5464 case BOND_MODE_8023AD: 5465 case BOND_MODE_XOR: 5466 slave = bond_xdp_xmit_3ad_xor_slave_get(bond, xdp); 5467 break; 5468 5469 default: 5470 /* Should never happen. Mode guarded by bond_xdp_check() */ 5471 netdev_err(bond_dev, "Unknown bonding mode %d for xdp xmit\n", BOND_MODE(bond)); 5472 WARN_ON_ONCE(1); 5473 return NULL; 5474 } 5475 5476 if (slave) 5477 return slave->dev; 5478 5479 return NULL; 5480 } 5481 5482 static int bond_xdp_xmit(struct net_device *bond_dev, 5483 int n, struct xdp_frame **frames, u32 flags) 5484 { 5485 int nxmit, err = -ENXIO; 5486 5487 rcu_read_lock(); 5488 5489 for (nxmit = 0; nxmit < n; nxmit++) { 5490 struct xdp_frame *frame = frames[nxmit]; 5491 struct xdp_frame *frames1[] = {frame}; 5492 struct net_device *slave_dev; 5493 struct xdp_buff xdp; 5494 5495 xdp_convert_frame_to_buff(frame, &xdp); 5496 5497 slave_dev = bond_xdp_get_xmit_slave(bond_dev, &xdp); 5498 if (!slave_dev) { 5499 err = -ENXIO; 5500 break; 5501 } 5502 5503 err = slave_dev->netdev_ops->ndo_xdp_xmit(slave_dev, 1, frames1, flags); 5504 if (err < 1) 5505 break; 5506 } 5507 5508 rcu_read_unlock(); 5509 5510 /* If error happened on the first frame then we can pass the error up, otherwise 5511 * report the number of frames that were xmitted. 5512 */ 5513 if (err < 0) 5514 return (nxmit == 0 ? err : nxmit); 5515 5516 return nxmit; 5517 } 5518 5519 static int bond_xdp_set(struct net_device *dev, struct bpf_prog *prog, 5520 struct netlink_ext_ack *extack) 5521 { 5522 struct bonding *bond = netdev_priv(dev); 5523 struct list_head *iter; 5524 struct slave *slave, *rollback_slave; 5525 struct bpf_prog *old_prog; 5526 struct netdev_bpf xdp = { 5527 .command = XDP_SETUP_PROG, 5528 .flags = 0, 5529 .prog = prog, 5530 .extack = extack, 5531 }; 5532 int err; 5533 5534 ASSERT_RTNL(); 5535 5536 if (!bond_xdp_check(bond)) 5537 return -EOPNOTSUPP; 5538 5539 old_prog = bond->xdp_prog; 5540 bond->xdp_prog = prog; 5541 5542 bond_for_each_slave(bond, slave, iter) { 5543 struct net_device *slave_dev = slave->dev; 5544 5545 if (!slave_dev->netdev_ops->ndo_bpf || 5546 !slave_dev->netdev_ops->ndo_xdp_xmit) { 5547 SLAVE_NL_ERR(dev, slave_dev, extack, 5548 "Slave device does not support XDP"); 5549 err = -EOPNOTSUPP; 5550 goto err; 5551 } 5552 5553 if (dev_xdp_prog_count(slave_dev) > 0) { 5554 SLAVE_NL_ERR(dev, slave_dev, extack, 5555 "Slave has XDP program loaded, please unload before enslaving"); 5556 err = -EOPNOTSUPP; 5557 goto err; 5558 } 5559 5560 err = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 5561 if (err < 0) { 5562 /* ndo_bpf() sets extack error message */ 5563 slave_err(dev, slave_dev, "Error %d calling ndo_bpf\n", err); 5564 goto err; 5565 } 5566 if (prog) 5567 bpf_prog_inc(prog); 5568 } 5569 5570 if (prog) { 5571 static_branch_inc(&bpf_master_redirect_enabled_key); 5572 } else if (old_prog) { 5573 bpf_prog_put(old_prog); 5574 static_branch_dec(&bpf_master_redirect_enabled_key); 5575 } 5576 5577 return 0; 5578 5579 err: 5580 /* unwind the program changes */ 5581 bond->xdp_prog = old_prog; 5582 xdp.prog = old_prog; 5583 xdp.extack = NULL; /* do not overwrite original error */ 5584 5585 bond_for_each_slave(bond, rollback_slave, iter) { 5586 struct net_device *slave_dev = rollback_slave->dev; 5587 int err_unwind; 5588 5589 if (slave == rollback_slave) 5590 break; 5591 5592 err_unwind = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 5593 if (err_unwind < 0) 5594 slave_err(dev, slave_dev, 5595 "Error %d when unwinding XDP program change\n", err_unwind); 5596 else if (xdp.prog) 5597 bpf_prog_inc(xdp.prog); 5598 } 5599 return err; 5600 } 5601 5602 static int bond_xdp(struct net_device *dev, struct netdev_bpf *xdp) 5603 { 5604 switch (xdp->command) { 5605 case XDP_SETUP_PROG: 5606 return bond_xdp_set(dev, xdp->prog, xdp->extack); 5607 default: 5608 return -EINVAL; 5609 } 5610 } 5611 5612 static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed) 5613 { 5614 if (speed == 0 || speed == SPEED_UNKNOWN) 5615 speed = slave->speed; 5616 else 5617 speed = min(speed, slave->speed); 5618 5619 return speed; 5620 } 5621 5622 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev, 5623 struct ethtool_link_ksettings *cmd) 5624 { 5625 struct bonding *bond = netdev_priv(bond_dev); 5626 struct list_head *iter; 5627 struct slave *slave; 5628 u32 speed = 0; 5629 5630 cmd->base.duplex = DUPLEX_UNKNOWN; 5631 cmd->base.port = PORT_OTHER; 5632 5633 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we 5634 * do not need to check mode. Though link speed might not represent 5635 * the true receive or transmit bandwidth (not all modes are symmetric) 5636 * this is an accurate maximum. 5637 */ 5638 bond_for_each_slave(bond, slave, iter) { 5639 if (bond_slave_can_tx(slave)) { 5640 if (slave->speed != SPEED_UNKNOWN) { 5641 if (BOND_MODE(bond) == BOND_MODE_BROADCAST) 5642 speed = bond_mode_bcast_speed(slave, 5643 speed); 5644 else 5645 speed += slave->speed; 5646 } 5647 if (cmd->base.duplex == DUPLEX_UNKNOWN && 5648 slave->duplex != DUPLEX_UNKNOWN) 5649 cmd->base.duplex = slave->duplex; 5650 } 5651 } 5652 cmd->base.speed = speed ? : SPEED_UNKNOWN; 5653 5654 return 0; 5655 } 5656 5657 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 5658 struct ethtool_drvinfo *drvinfo) 5659 { 5660 strscpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver)); 5661 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d", 5662 BOND_ABI_VERSION); 5663 } 5664 5665 static int bond_ethtool_get_ts_info(struct net_device *bond_dev, 5666 struct ethtool_ts_info *info) 5667 { 5668 struct bonding *bond = netdev_priv(bond_dev); 5669 const struct ethtool_ops *ops; 5670 struct net_device *real_dev; 5671 struct phy_device *phydev; 5672 int ret = 0; 5673 5674 rcu_read_lock(); 5675 real_dev = bond_option_active_slave_get_rcu(bond); 5676 dev_hold(real_dev); 5677 rcu_read_unlock(); 5678 5679 if (real_dev) { 5680 ops = real_dev->ethtool_ops; 5681 phydev = real_dev->phydev; 5682 5683 if (phy_has_tsinfo(phydev)) { 5684 ret = phy_ts_info(phydev, info); 5685 goto out; 5686 } else if (ops->get_ts_info) { 5687 ret = ops->get_ts_info(real_dev, info); 5688 goto out; 5689 } 5690 } 5691 5692 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE | 5693 SOF_TIMESTAMPING_SOFTWARE; 5694 info->phc_index = -1; 5695 5696 out: 5697 dev_put(real_dev); 5698 return ret; 5699 } 5700 5701 static const struct ethtool_ops bond_ethtool_ops = { 5702 .get_drvinfo = bond_ethtool_get_drvinfo, 5703 .get_link = ethtool_op_get_link, 5704 .get_link_ksettings = bond_ethtool_get_link_ksettings, 5705 .get_ts_info = bond_ethtool_get_ts_info, 5706 }; 5707 5708 static const struct net_device_ops bond_netdev_ops = { 5709 .ndo_init = bond_init, 5710 .ndo_uninit = bond_uninit, 5711 .ndo_open = bond_open, 5712 .ndo_stop = bond_close, 5713 .ndo_start_xmit = bond_start_xmit, 5714 .ndo_select_queue = bond_select_queue, 5715 .ndo_get_stats64 = bond_get_stats, 5716 .ndo_eth_ioctl = bond_eth_ioctl, 5717 .ndo_siocbond = bond_do_ioctl, 5718 .ndo_siocdevprivate = bond_siocdevprivate, 5719 .ndo_change_rx_flags = bond_change_rx_flags, 5720 .ndo_set_rx_mode = bond_set_rx_mode, 5721 .ndo_change_mtu = bond_change_mtu, 5722 .ndo_set_mac_address = bond_set_mac_address, 5723 .ndo_neigh_setup = bond_neigh_setup, 5724 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 5725 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 5726 #ifdef CONFIG_NET_POLL_CONTROLLER 5727 .ndo_netpoll_setup = bond_netpoll_setup, 5728 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 5729 .ndo_poll_controller = bond_poll_controller, 5730 #endif 5731 .ndo_add_slave = bond_enslave, 5732 .ndo_del_slave = bond_release, 5733 .ndo_fix_features = bond_fix_features, 5734 .ndo_features_check = passthru_features_check, 5735 .ndo_get_xmit_slave = bond_xmit_get_slave, 5736 .ndo_sk_get_lower_dev = bond_sk_get_lower_dev, 5737 .ndo_bpf = bond_xdp, 5738 .ndo_xdp_xmit = bond_xdp_xmit, 5739 .ndo_xdp_get_xmit_slave = bond_xdp_get_xmit_slave, 5740 }; 5741 5742 static const struct device_type bond_type = { 5743 .name = "bond", 5744 }; 5745 5746 static void bond_destructor(struct net_device *bond_dev) 5747 { 5748 struct bonding *bond = netdev_priv(bond_dev); 5749 5750 if (bond->wq) 5751 destroy_workqueue(bond->wq); 5752 5753 if (bond->rr_tx_counter) 5754 free_percpu(bond->rr_tx_counter); 5755 } 5756 5757 void bond_setup(struct net_device *bond_dev) 5758 { 5759 struct bonding *bond = netdev_priv(bond_dev); 5760 5761 spin_lock_init(&bond->mode_lock); 5762 bond->params = bonding_defaults; 5763 5764 /* Initialize pointers */ 5765 bond->dev = bond_dev; 5766 5767 /* Initialize the device entry points */ 5768 ether_setup(bond_dev); 5769 bond_dev->max_mtu = ETH_MAX_MTU; 5770 bond_dev->netdev_ops = &bond_netdev_ops; 5771 bond_dev->ethtool_ops = &bond_ethtool_ops; 5772 5773 bond_dev->needs_free_netdev = true; 5774 bond_dev->priv_destructor = bond_destructor; 5775 5776 SET_NETDEV_DEVTYPE(bond_dev, &bond_type); 5777 5778 /* Initialize the device options */ 5779 bond_dev->flags |= IFF_MASTER; 5780 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE; 5781 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 5782 5783 #ifdef CONFIG_XFRM_OFFLOAD 5784 /* set up xfrm device ops (only supported in active-backup right now) */ 5785 bond_dev->xfrmdev_ops = &bond_xfrmdev_ops; 5786 INIT_LIST_HEAD(&bond->ipsec_list); 5787 spin_lock_init(&bond->ipsec_lock); 5788 #endif /* CONFIG_XFRM_OFFLOAD */ 5789 5790 /* don't acquire bond device's netif_tx_lock when transmitting */ 5791 bond_dev->features |= NETIF_F_LLTX; 5792 5793 /* By default, we declare the bond to be fully 5794 * VLAN hardware accelerated capable. Special 5795 * care is taken in the various xmit functions 5796 * when there are slaves that are not hw accel 5797 * capable 5798 */ 5799 5800 /* Don't allow bond devices to change network namespaces. */ 5801 bond_dev->features |= NETIF_F_NETNS_LOCAL; 5802 5803 bond_dev->hw_features = BOND_VLAN_FEATURES | 5804 NETIF_F_HW_VLAN_CTAG_RX | 5805 NETIF_F_HW_VLAN_CTAG_FILTER; 5806 5807 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL; 5808 bond_dev->features |= bond_dev->hw_features; 5809 bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; 5810 #ifdef CONFIG_XFRM_OFFLOAD 5811 bond_dev->hw_features |= BOND_XFRM_FEATURES; 5812 /* Only enable XFRM features if this is an active-backup config */ 5813 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 5814 bond_dev->features |= BOND_XFRM_FEATURES; 5815 #endif /* CONFIG_XFRM_OFFLOAD */ 5816 #if IS_ENABLED(CONFIG_TLS_DEVICE) 5817 if (bond_sk_check(bond)) 5818 bond_dev->features |= BOND_TLS_FEATURES; 5819 #endif 5820 } 5821 5822 /* Destroy a bonding device. 5823 * Must be under rtnl_lock when this function is called. 5824 */ 5825 static void bond_uninit(struct net_device *bond_dev) 5826 { 5827 struct bonding *bond = netdev_priv(bond_dev); 5828 struct bond_up_slave *usable, *all; 5829 struct list_head *iter; 5830 struct slave *slave; 5831 5832 bond_netpoll_cleanup(bond_dev); 5833 5834 /* Release the bonded slaves */ 5835 bond_for_each_slave(bond, slave, iter) 5836 __bond_release_one(bond_dev, slave->dev, true, true); 5837 netdev_info(bond_dev, "Released all slaves\n"); 5838 5839 usable = rtnl_dereference(bond->usable_slaves); 5840 if (usable) { 5841 RCU_INIT_POINTER(bond->usable_slaves, NULL); 5842 kfree_rcu(usable, rcu); 5843 } 5844 5845 all = rtnl_dereference(bond->all_slaves); 5846 if (all) { 5847 RCU_INIT_POINTER(bond->all_slaves, NULL); 5848 kfree_rcu(all, rcu); 5849 } 5850 5851 list_del(&bond->bond_list); 5852 5853 bond_debug_unregister(bond); 5854 } 5855 5856 /*------------------------- Module initialization ---------------------------*/ 5857 5858 static int bond_check_params(struct bond_params *params) 5859 { 5860 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i; 5861 struct bond_opt_value newval; 5862 const struct bond_opt_value *valptr; 5863 int arp_all_targets_value = 0; 5864 u16 ad_actor_sys_prio = 0; 5865 u16 ad_user_port_key = 0; 5866 __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 }; 5867 int arp_ip_count; 5868 int bond_mode = BOND_MODE_ROUNDROBIN; 5869 int xmit_hashtype = BOND_XMIT_POLICY_LAYER2; 5870 int lacp_fast = 0; 5871 int tlb_dynamic_lb; 5872 5873 /* Convert string parameters. */ 5874 if (mode) { 5875 bond_opt_initstr(&newval, mode); 5876 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval); 5877 if (!valptr) { 5878 pr_err("Error: Invalid bonding mode \"%s\"\n", mode); 5879 return -EINVAL; 5880 } 5881 bond_mode = valptr->value; 5882 } 5883 5884 if (xmit_hash_policy) { 5885 if (bond_mode == BOND_MODE_ROUNDROBIN || 5886 bond_mode == BOND_MODE_ACTIVEBACKUP || 5887 bond_mode == BOND_MODE_BROADCAST) { 5888 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 5889 bond_mode_name(bond_mode)); 5890 } else { 5891 bond_opt_initstr(&newval, xmit_hash_policy); 5892 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH), 5893 &newval); 5894 if (!valptr) { 5895 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 5896 xmit_hash_policy); 5897 return -EINVAL; 5898 } 5899 xmit_hashtype = valptr->value; 5900 } 5901 } 5902 5903 if (lacp_rate) { 5904 if (bond_mode != BOND_MODE_8023AD) { 5905 pr_info("lacp_rate param is irrelevant in mode %s\n", 5906 bond_mode_name(bond_mode)); 5907 } else { 5908 bond_opt_initstr(&newval, lacp_rate); 5909 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE), 5910 &newval); 5911 if (!valptr) { 5912 pr_err("Error: Invalid lacp rate \"%s\"\n", 5913 lacp_rate); 5914 return -EINVAL; 5915 } 5916 lacp_fast = valptr->value; 5917 } 5918 } 5919 5920 if (ad_select) { 5921 bond_opt_initstr(&newval, ad_select); 5922 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT), 5923 &newval); 5924 if (!valptr) { 5925 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select); 5926 return -EINVAL; 5927 } 5928 params->ad_select = valptr->value; 5929 if (bond_mode != BOND_MODE_8023AD) 5930 pr_warn("ad_select param only affects 802.3ad mode\n"); 5931 } else { 5932 params->ad_select = BOND_AD_STABLE; 5933 } 5934 5935 if (max_bonds < 0) { 5936 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 5937 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 5938 max_bonds = BOND_DEFAULT_MAX_BONDS; 5939 } 5940 5941 if (miimon < 0) { 5942 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n", 5943 miimon, INT_MAX); 5944 miimon = 0; 5945 } 5946 5947 if (updelay < 0) { 5948 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 5949 updelay, INT_MAX); 5950 updelay = 0; 5951 } 5952 5953 if (downdelay < 0) { 5954 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 5955 downdelay, INT_MAX); 5956 downdelay = 0; 5957 } 5958 5959 if ((use_carrier != 0) && (use_carrier != 1)) { 5960 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 5961 use_carrier); 5962 use_carrier = 1; 5963 } 5964 5965 if (num_peer_notif < 0 || num_peer_notif > 255) { 5966 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 5967 num_peer_notif); 5968 num_peer_notif = 1; 5969 } 5970 5971 /* reset values for 802.3ad/TLB/ALB */ 5972 if (!bond_mode_uses_arp(bond_mode)) { 5973 if (!miimon) { 5974 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"); 5975 pr_warn("Forcing miimon to 100msec\n"); 5976 miimon = BOND_DEFAULT_MIIMON; 5977 } 5978 } 5979 5980 if (tx_queues < 1 || tx_queues > 255) { 5981 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n", 5982 tx_queues, BOND_DEFAULT_TX_QUEUES); 5983 tx_queues = BOND_DEFAULT_TX_QUEUES; 5984 } 5985 5986 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 5987 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n", 5988 all_slaves_active); 5989 all_slaves_active = 0; 5990 } 5991 5992 if (resend_igmp < 0 || resend_igmp > 255) { 5993 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n", 5994 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 5995 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 5996 } 5997 5998 bond_opt_initval(&newval, packets_per_slave); 5999 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) { 6000 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n", 6001 packets_per_slave, USHRT_MAX); 6002 packets_per_slave = 1; 6003 } 6004 6005 if (bond_mode == BOND_MODE_ALB) { 6006 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", 6007 updelay); 6008 } 6009 6010 if (!miimon) { 6011 if (updelay || downdelay) { 6012 /* just warn the user the up/down delay will have 6013 * no effect since miimon is zero... 6014 */ 6015 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", 6016 updelay, downdelay); 6017 } 6018 } else { 6019 /* don't allow arp monitoring */ 6020 if (arp_interval) { 6021 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 6022 miimon, arp_interval); 6023 arp_interval = 0; 6024 } 6025 6026 if ((updelay % miimon) != 0) { 6027 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 6028 updelay, miimon, (updelay / miimon) * miimon); 6029 } 6030 6031 updelay /= miimon; 6032 6033 if ((downdelay % miimon) != 0) { 6034 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 6035 downdelay, miimon, 6036 (downdelay / miimon) * miimon); 6037 } 6038 6039 downdelay /= miimon; 6040 } 6041 6042 if (arp_interval < 0) { 6043 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n", 6044 arp_interval, INT_MAX); 6045 arp_interval = 0; 6046 } 6047 6048 for (arp_ip_count = 0, i = 0; 6049 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) { 6050 __be32 ip; 6051 6052 /* not a complete check, but good enough to catch mistakes */ 6053 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) || 6054 !bond_is_ip_target_ok(ip)) { 6055 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 6056 arp_ip_target[i]); 6057 arp_interval = 0; 6058 } else { 6059 if (bond_get_targets_ip(arp_target, ip) == -1) 6060 arp_target[arp_ip_count++] = ip; 6061 else 6062 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n", 6063 &ip); 6064 } 6065 } 6066 6067 if (arp_interval && !arp_ip_count) { 6068 /* don't allow arping if no arp_ip_target given... */ 6069 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 6070 arp_interval); 6071 arp_interval = 0; 6072 } 6073 6074 if (arp_validate) { 6075 if (!arp_interval) { 6076 pr_err("arp_validate requires arp_interval\n"); 6077 return -EINVAL; 6078 } 6079 6080 bond_opt_initstr(&newval, arp_validate); 6081 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE), 6082 &newval); 6083 if (!valptr) { 6084 pr_err("Error: invalid arp_validate \"%s\"\n", 6085 arp_validate); 6086 return -EINVAL; 6087 } 6088 arp_validate_value = valptr->value; 6089 } else { 6090 arp_validate_value = 0; 6091 } 6092 6093 if (arp_all_targets) { 6094 bond_opt_initstr(&newval, arp_all_targets); 6095 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS), 6096 &newval); 6097 if (!valptr) { 6098 pr_err("Error: invalid arp_all_targets_value \"%s\"\n", 6099 arp_all_targets); 6100 arp_all_targets_value = 0; 6101 } else { 6102 arp_all_targets_value = valptr->value; 6103 } 6104 } 6105 6106 if (miimon) { 6107 pr_info("MII link monitoring set to %d ms\n", miimon); 6108 } else if (arp_interval) { 6109 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE, 6110 arp_validate_value); 6111 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 6112 arp_interval, valptr->string, arp_ip_count); 6113 6114 for (i = 0; i < arp_ip_count; i++) 6115 pr_cont(" %s", arp_ip_target[i]); 6116 6117 pr_cont("\n"); 6118 6119 } else if (max_bonds) { 6120 /* miimon and arp_interval not set, we need one so things 6121 * work as expected, see bonding.txt for details 6122 */ 6123 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"); 6124 } 6125 6126 if (primary && !bond_mode_uses_primary(bond_mode)) { 6127 /* currently, using a primary only makes sense 6128 * in active backup, TLB or ALB modes 6129 */ 6130 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n", 6131 primary, bond_mode_name(bond_mode)); 6132 primary = NULL; 6133 } 6134 6135 if (primary && primary_reselect) { 6136 bond_opt_initstr(&newval, primary_reselect); 6137 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT), 6138 &newval); 6139 if (!valptr) { 6140 pr_err("Error: Invalid primary_reselect \"%s\"\n", 6141 primary_reselect); 6142 return -EINVAL; 6143 } 6144 primary_reselect_value = valptr->value; 6145 } else { 6146 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 6147 } 6148 6149 if (fail_over_mac) { 6150 bond_opt_initstr(&newval, fail_over_mac); 6151 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC), 6152 &newval); 6153 if (!valptr) { 6154 pr_err("Error: invalid fail_over_mac \"%s\"\n", 6155 fail_over_mac); 6156 return -EINVAL; 6157 } 6158 fail_over_mac_value = valptr->value; 6159 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 6160 pr_warn("Warning: fail_over_mac only affects active-backup mode\n"); 6161 } else { 6162 fail_over_mac_value = BOND_FOM_NONE; 6163 } 6164 6165 bond_opt_initstr(&newval, "default"); 6166 valptr = bond_opt_parse( 6167 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO), 6168 &newval); 6169 if (!valptr) { 6170 pr_err("Error: No ad_actor_sys_prio default value"); 6171 return -EINVAL; 6172 } 6173 ad_actor_sys_prio = valptr->value; 6174 6175 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY), 6176 &newval); 6177 if (!valptr) { 6178 pr_err("Error: No ad_user_port_key default value"); 6179 return -EINVAL; 6180 } 6181 ad_user_port_key = valptr->value; 6182 6183 bond_opt_initstr(&newval, "default"); 6184 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval); 6185 if (!valptr) { 6186 pr_err("Error: No tlb_dynamic_lb default value"); 6187 return -EINVAL; 6188 } 6189 tlb_dynamic_lb = valptr->value; 6190 6191 if (lp_interval == 0) { 6192 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n", 6193 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL); 6194 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 6195 } 6196 6197 /* fill params struct with the proper values */ 6198 params->mode = bond_mode; 6199 params->xmit_policy = xmit_hashtype; 6200 params->miimon = miimon; 6201 params->num_peer_notif = num_peer_notif; 6202 params->arp_interval = arp_interval; 6203 params->arp_validate = arp_validate_value; 6204 params->arp_all_targets = arp_all_targets_value; 6205 params->missed_max = 2; 6206 params->updelay = updelay; 6207 params->downdelay = downdelay; 6208 params->peer_notif_delay = 0; 6209 params->use_carrier = use_carrier; 6210 params->lacp_active = 1; 6211 params->lacp_fast = lacp_fast; 6212 params->primary[0] = 0; 6213 params->primary_reselect = primary_reselect_value; 6214 params->fail_over_mac = fail_over_mac_value; 6215 params->tx_queues = tx_queues; 6216 params->all_slaves_active = all_slaves_active; 6217 params->resend_igmp = resend_igmp; 6218 params->min_links = min_links; 6219 params->lp_interval = lp_interval; 6220 params->packets_per_slave = packets_per_slave; 6221 params->tlb_dynamic_lb = tlb_dynamic_lb; 6222 params->ad_actor_sys_prio = ad_actor_sys_prio; 6223 eth_zero_addr(params->ad_actor_system); 6224 params->ad_user_port_key = ad_user_port_key; 6225 if (packets_per_slave > 0) { 6226 params->reciprocal_packets_per_slave = 6227 reciprocal_value(packets_per_slave); 6228 } else { 6229 /* reciprocal_packets_per_slave is unused if 6230 * packets_per_slave is 0 or 1, just initialize it 6231 */ 6232 params->reciprocal_packets_per_slave = 6233 (struct reciprocal_value) { 0 }; 6234 } 6235 6236 if (primary) 6237 strscpy_pad(params->primary, primary, sizeof(params->primary)); 6238 6239 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 6240 #if IS_ENABLED(CONFIG_IPV6) 6241 memset(params->ns_targets, 0, sizeof(struct in6_addr) * BOND_MAX_NS_TARGETS); 6242 #endif 6243 6244 return 0; 6245 } 6246 6247 /* Called from registration process */ 6248 static int bond_init(struct net_device *bond_dev) 6249 { 6250 struct bonding *bond = netdev_priv(bond_dev); 6251 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 6252 6253 netdev_dbg(bond_dev, "Begin bond_init\n"); 6254 6255 bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM); 6256 if (!bond->wq) 6257 return -ENOMEM; 6258 6259 spin_lock_init(&bond->stats_lock); 6260 netdev_lockdep_set_classes(bond_dev); 6261 6262 list_add_tail(&bond->bond_list, &bn->dev_list); 6263 6264 bond_prepare_sysfs_group(bond); 6265 6266 bond_debug_register(bond); 6267 6268 /* Ensure valid dev_addr */ 6269 if (is_zero_ether_addr(bond_dev->dev_addr) && 6270 bond_dev->addr_assign_type == NET_ADDR_PERM) 6271 eth_hw_addr_random(bond_dev); 6272 6273 return 0; 6274 } 6275 6276 unsigned int bond_get_num_tx_queues(void) 6277 { 6278 return tx_queues; 6279 } 6280 6281 /* Create a new bond based on the specified name and bonding parameters. 6282 * If name is NULL, obtain a suitable "bond%d" name for us. 6283 * Caller must NOT hold rtnl_lock; we need to release it here before we 6284 * set up our sysfs entries. 6285 */ 6286 int bond_create(struct net *net, const char *name) 6287 { 6288 struct net_device *bond_dev; 6289 struct bonding *bond; 6290 int res = -ENOMEM; 6291 6292 rtnl_lock(); 6293 6294 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 6295 name ? name : "bond%d", NET_NAME_UNKNOWN, 6296 bond_setup, tx_queues); 6297 if (!bond_dev) 6298 goto out; 6299 6300 bond = netdev_priv(bond_dev); 6301 dev_net_set(bond_dev, net); 6302 bond_dev->rtnl_link_ops = &bond_link_ops; 6303 6304 res = register_netdevice(bond_dev); 6305 if (res < 0) { 6306 free_netdev(bond_dev); 6307 goto out; 6308 } 6309 6310 netif_carrier_off(bond_dev); 6311 6312 bond_work_init_all(bond); 6313 6314 out: 6315 rtnl_unlock(); 6316 return res; 6317 } 6318 6319 static int __net_init bond_net_init(struct net *net) 6320 { 6321 struct bond_net *bn = net_generic(net, bond_net_id); 6322 6323 bn->net = net; 6324 INIT_LIST_HEAD(&bn->dev_list); 6325 6326 bond_create_proc_dir(bn); 6327 bond_create_sysfs(bn); 6328 6329 return 0; 6330 } 6331 6332 static void __net_exit bond_net_exit_batch(struct list_head *net_list) 6333 { 6334 struct bond_net *bn; 6335 struct net *net; 6336 LIST_HEAD(list); 6337 6338 list_for_each_entry(net, net_list, exit_list) { 6339 bn = net_generic(net, bond_net_id); 6340 bond_destroy_sysfs(bn); 6341 } 6342 6343 /* Kill off any bonds created after unregistering bond rtnl ops */ 6344 rtnl_lock(); 6345 list_for_each_entry(net, net_list, exit_list) { 6346 struct bonding *bond, *tmp_bond; 6347 6348 bn = net_generic(net, bond_net_id); 6349 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list) 6350 unregister_netdevice_queue(bond->dev, &list); 6351 } 6352 unregister_netdevice_many(&list); 6353 rtnl_unlock(); 6354 6355 list_for_each_entry(net, net_list, exit_list) { 6356 bn = net_generic(net, bond_net_id); 6357 bond_destroy_proc_dir(bn); 6358 } 6359 } 6360 6361 static struct pernet_operations bond_net_ops = { 6362 .init = bond_net_init, 6363 .exit_batch = bond_net_exit_batch, 6364 .id = &bond_net_id, 6365 .size = sizeof(struct bond_net), 6366 }; 6367 6368 static int __init bonding_init(void) 6369 { 6370 int i; 6371 int res; 6372 6373 res = bond_check_params(&bonding_defaults); 6374 if (res) 6375 goto out; 6376 6377 res = register_pernet_subsys(&bond_net_ops); 6378 if (res) 6379 goto out; 6380 6381 res = bond_netlink_init(); 6382 if (res) 6383 goto err_link; 6384 6385 bond_create_debugfs(); 6386 6387 for (i = 0; i < max_bonds; i++) { 6388 res = bond_create(&init_net, NULL); 6389 if (res) 6390 goto err; 6391 } 6392 6393 skb_flow_dissector_init(&flow_keys_bonding, 6394 flow_keys_bonding_keys, 6395 ARRAY_SIZE(flow_keys_bonding_keys)); 6396 6397 register_netdevice_notifier(&bond_netdev_notifier); 6398 out: 6399 return res; 6400 err: 6401 bond_destroy_debugfs(); 6402 bond_netlink_fini(); 6403 err_link: 6404 unregister_pernet_subsys(&bond_net_ops); 6405 goto out; 6406 6407 } 6408 6409 static void __exit bonding_exit(void) 6410 { 6411 unregister_netdevice_notifier(&bond_netdev_notifier); 6412 6413 bond_destroy_debugfs(); 6414 6415 bond_netlink_fini(); 6416 unregister_pernet_subsys(&bond_net_ops); 6417 6418 #ifdef CONFIG_NET_POLL_CONTROLLER 6419 /* Make sure we don't have an imbalance on our netpoll blocking */ 6420 WARN_ON(atomic_read(&netpoll_block_tx)); 6421 #endif 6422 } 6423 6424 module_init(bonding_init); 6425 module_exit(bonding_exit); 6426 MODULE_LICENSE("GPL"); 6427 MODULE_DESCRIPTION(DRV_DESCRIPTION); 6428 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 6429