1 /* 2 * originally based on the dummy device. 3 * 4 * Copyright 1999, Thomas Davis, tadavis@lbl.gov. 5 * Licensed under the GPL. Based on dummy.c, and eql.c devices. 6 * 7 * bonding.c: an Ethernet Bonding driver 8 * 9 * This is useful to talk to a Cisco EtherChannel compatible equipment: 10 * Cisco 5500 11 * Sun Trunking (Solaris) 12 * Alteon AceDirector Trunks 13 * Linux Bonding 14 * and probably many L2 switches ... 15 * 16 * How it works: 17 * ifconfig bond0 ipaddress netmask up 18 * will setup a network device, with an ip address. No mac address 19 * will be assigned at this time. The hw mac address will come from 20 * the first slave bonded to the channel. All slaves will then use 21 * this hw mac address. 22 * 23 * ifconfig bond0 down 24 * will release all slaves, marking them as down. 25 * 26 * ifenslave bond0 eth0 27 * will attach eth0 to bond0 as a slave. eth0 hw mac address will either 28 * a: be used as initial mac address 29 * b: if a hw mac address already is there, eth0's hw mac address 30 * will then be set from bond0. 31 * 32 */ 33 34 #include <linux/kernel.h> 35 #include <linux/module.h> 36 #include <linux/types.h> 37 #include <linux/fcntl.h> 38 #include <linux/filter.h> 39 #include <linux/interrupt.h> 40 #include <linux/ptrace.h> 41 #include <linux/ioport.h> 42 #include <linux/in.h> 43 #include <net/ip.h> 44 #include <linux/ip.h> 45 #include <linux/icmp.h> 46 #include <linux/icmpv6.h> 47 #include <linux/tcp.h> 48 #include <linux/udp.h> 49 #include <linux/slab.h> 50 #include <linux/string.h> 51 #include <linux/init.h> 52 #include <linux/timer.h> 53 #include <linux/socket.h> 54 #include <linux/ctype.h> 55 #include <linux/inet.h> 56 #include <linux/bitops.h> 57 #include <linux/io.h> 58 #include <asm/dma.h> 59 #include <linux/uaccess.h> 60 #include <linux/errno.h> 61 #include <linux/netdevice.h> 62 #include <linux/inetdevice.h> 63 #include <linux/igmp.h> 64 #include <linux/etherdevice.h> 65 #include <linux/skbuff.h> 66 #include <net/sock.h> 67 #include <linux/rtnetlink.h> 68 #include <linux/smp.h> 69 #include <linux/if_ether.h> 70 #include <net/arp.h> 71 #include <linux/mii.h> 72 #include <linux/ethtool.h> 73 #include <linux/if_vlan.h> 74 #include <linux/if_bonding.h> 75 #include <linux/phy.h> 76 #include <linux/jiffies.h> 77 #include <linux/preempt.h> 78 #include <net/route.h> 79 #include <net/net_namespace.h> 80 #include <net/netns/generic.h> 81 #include <net/pkt_sched.h> 82 #include <linux/rculist.h> 83 #include <net/flow_dissector.h> 84 #include <net/xfrm.h> 85 #include <net/bonding.h> 86 #include <net/bond_3ad.h> 87 #include <net/bond_alb.h> 88 #if IS_ENABLED(CONFIG_TLS_DEVICE) 89 #include <net/tls.h> 90 #endif 91 #include <net/ip6_route.h> 92 93 #include "bonding_priv.h" 94 95 /*---------------------------- Module parameters ----------------------------*/ 96 97 /* monitor all links that often (in milliseconds). <=0 disables monitoring */ 98 99 static int max_bonds = BOND_DEFAULT_MAX_BONDS; 100 static int tx_queues = BOND_DEFAULT_TX_QUEUES; 101 static int num_peer_notif = 1; 102 static int miimon; 103 static int updelay; 104 static int downdelay; 105 static int use_carrier = 1; 106 static char *mode; 107 static char *primary; 108 static char *primary_reselect; 109 static char *lacp_rate; 110 static int min_links; 111 static char *ad_select; 112 static char *xmit_hash_policy; 113 static int arp_interval; 114 static char *arp_ip_target[BOND_MAX_ARP_TARGETS]; 115 static char *arp_validate; 116 static char *arp_all_targets; 117 static char *fail_over_mac; 118 static int all_slaves_active; 119 static struct bond_params bonding_defaults; 120 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP; 121 static int packets_per_slave = 1; 122 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 123 124 module_param(max_bonds, int, 0); 125 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices"); 126 module_param(tx_queues, int, 0); 127 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)"); 128 module_param_named(num_grat_arp, num_peer_notif, int, 0644); 129 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on " 130 "failover event (alias of num_unsol_na)"); 131 module_param_named(num_unsol_na, num_peer_notif, int, 0644); 132 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on " 133 "failover event (alias of num_grat_arp)"); 134 module_param(miimon, int, 0); 135 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds"); 136 module_param(updelay, int, 0); 137 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds"); 138 module_param(downdelay, int, 0); 139 MODULE_PARM_DESC(downdelay, "Delay before considering link down, " 140 "in milliseconds"); 141 module_param(use_carrier, int, 0); 142 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; " 143 "0 for off, 1 for on (default)"); 144 module_param(mode, charp, 0); 145 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, " 146 "1 for active-backup, 2 for balance-xor, " 147 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, " 148 "6 for balance-alb"); 149 module_param(primary, charp, 0); 150 MODULE_PARM_DESC(primary, "Primary network device to use"); 151 module_param(primary_reselect, charp, 0); 152 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave " 153 "once it comes up; " 154 "0 for always (default), " 155 "1 for only if speed of primary is " 156 "better, " 157 "2 for only on active slave " 158 "failure"); 159 module_param(lacp_rate, charp, 0); 160 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; " 161 "0 for slow, 1 for fast"); 162 module_param(ad_select, charp, 0); 163 MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; " 164 "0 for stable (default), 1 for bandwidth, " 165 "2 for count"); 166 module_param(min_links, int, 0); 167 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier"); 168 169 module_param(xmit_hash_policy, charp, 0); 170 MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; " 171 "0 for layer 2 (default), 1 for layer 3+4, " 172 "2 for layer 2+3, 3 for encap layer 2+3, " 173 "4 for encap layer 3+4, 5 for vlan+srcmac"); 174 module_param(arp_interval, int, 0); 175 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds"); 176 module_param_array(arp_ip_target, charp, NULL, 0); 177 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form"); 178 module_param(arp_validate, charp, 0); 179 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; " 180 "0 for none (default), 1 for active, " 181 "2 for backup, 3 for all"); 182 module_param(arp_all_targets, charp, 0); 183 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all"); 184 module_param(fail_over_mac, charp, 0); 185 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to " 186 "the same MAC; 0 for none (default), " 187 "1 for active, 2 for follow"); 188 module_param(all_slaves_active, int, 0); 189 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface " 190 "by setting active flag for all slaves; " 191 "0 for never (default), 1 for always."); 192 module_param(resend_igmp, int, 0); 193 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on " 194 "link failure"); 195 module_param(packets_per_slave, int, 0); 196 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr " 197 "mode; 0 for a random slave, 1 packet per " 198 "slave (default), >1 packets per slave."); 199 module_param(lp_interval, uint, 0); 200 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where " 201 "the bonding driver sends learning packets to " 202 "each slaves peer switch. The default is 1."); 203 204 /*----------------------------- Global variables ----------------------------*/ 205 206 #ifdef CONFIG_NET_POLL_CONTROLLER 207 atomic_t netpoll_block_tx = ATOMIC_INIT(0); 208 #endif 209 210 unsigned int bond_net_id __read_mostly; 211 212 static const struct flow_dissector_key flow_keys_bonding_keys[] = { 213 { 214 .key_id = FLOW_DISSECTOR_KEY_CONTROL, 215 .offset = offsetof(struct flow_keys, control), 216 }, 217 { 218 .key_id = FLOW_DISSECTOR_KEY_BASIC, 219 .offset = offsetof(struct flow_keys, basic), 220 }, 221 { 222 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS, 223 .offset = offsetof(struct flow_keys, addrs.v4addrs), 224 }, 225 { 226 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS, 227 .offset = offsetof(struct flow_keys, addrs.v6addrs), 228 }, 229 { 230 .key_id = FLOW_DISSECTOR_KEY_TIPC, 231 .offset = offsetof(struct flow_keys, addrs.tipckey), 232 }, 233 { 234 .key_id = FLOW_DISSECTOR_KEY_PORTS, 235 .offset = offsetof(struct flow_keys, ports), 236 }, 237 { 238 .key_id = FLOW_DISSECTOR_KEY_ICMP, 239 .offset = offsetof(struct flow_keys, icmp), 240 }, 241 { 242 .key_id = FLOW_DISSECTOR_KEY_VLAN, 243 .offset = offsetof(struct flow_keys, vlan), 244 }, 245 { 246 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL, 247 .offset = offsetof(struct flow_keys, tags), 248 }, 249 { 250 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID, 251 .offset = offsetof(struct flow_keys, keyid), 252 }, 253 }; 254 255 static struct flow_dissector flow_keys_bonding __read_mostly; 256 257 /*-------------------------- Forward declarations ---------------------------*/ 258 259 static int bond_init(struct net_device *bond_dev); 260 static void bond_uninit(struct net_device *bond_dev); 261 static void bond_get_stats(struct net_device *bond_dev, 262 struct rtnl_link_stats64 *stats); 263 static void bond_slave_arr_handler(struct work_struct *work); 264 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 265 int mod); 266 static void bond_netdev_notify_work(struct work_struct *work); 267 268 /*---------------------------- General routines -----------------------------*/ 269 270 const char *bond_mode_name(int mode) 271 { 272 static const char *names[] = { 273 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)", 274 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)", 275 [BOND_MODE_XOR] = "load balancing (xor)", 276 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)", 277 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation", 278 [BOND_MODE_TLB] = "transmit load balancing", 279 [BOND_MODE_ALB] = "adaptive load balancing", 280 }; 281 282 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB) 283 return "unknown"; 284 285 return names[mode]; 286 } 287 288 /** 289 * bond_dev_queue_xmit - Prepare skb for xmit. 290 * 291 * @bond: bond device that got this skb for tx. 292 * @skb: hw accel VLAN tagged skb to transmit 293 * @slave_dev: slave that is supposed to xmit this skbuff 294 */ 295 netdev_tx_t bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, 296 struct net_device *slave_dev) 297 { 298 skb->dev = slave_dev; 299 300 BUILD_BUG_ON(sizeof(skb->queue_mapping) != 301 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping)); 302 skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping); 303 304 if (unlikely(netpoll_tx_running(bond->dev))) 305 return bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb); 306 307 return dev_queue_xmit(skb); 308 } 309 310 bool bond_sk_check(struct bonding *bond) 311 { 312 switch (BOND_MODE(bond)) { 313 case BOND_MODE_8023AD: 314 case BOND_MODE_XOR: 315 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34) 316 return true; 317 fallthrough; 318 default: 319 return false; 320 } 321 } 322 323 static bool bond_xdp_check(struct bonding *bond) 324 { 325 switch (BOND_MODE(bond)) { 326 case BOND_MODE_ROUNDROBIN: 327 case BOND_MODE_ACTIVEBACKUP: 328 return true; 329 case BOND_MODE_8023AD: 330 case BOND_MODE_XOR: 331 /* vlan+srcmac is not supported with XDP as in most cases the 802.1q 332 * payload is not in the packet due to hardware offload. 333 */ 334 if (bond->params.xmit_policy != BOND_XMIT_POLICY_VLAN_SRCMAC) 335 return true; 336 fallthrough; 337 default: 338 return false; 339 } 340 } 341 342 /*---------------------------------- VLAN -----------------------------------*/ 343 344 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid, 345 * We don't protect the slave list iteration with a lock because: 346 * a. This operation is performed in IOCTL context, 347 * b. The operation is protected by the RTNL semaphore in the 8021q code, 348 * c. Holding a lock with BH disabled while directly calling a base driver 349 * entry point is generally a BAD idea. 350 * 351 * The design of synchronization/protection for this operation in the 8021q 352 * module is good for one or more VLAN devices over a single physical device 353 * and cannot be extended for a teaming solution like bonding, so there is a 354 * potential race condition here where a net device from the vlan group might 355 * be referenced (either by a base driver or the 8021q code) while it is being 356 * removed from the system. However, it turns out we're not making matters 357 * worse, and if it works for regular VLAN usage it will work here too. 358 */ 359 360 /** 361 * bond_vlan_rx_add_vid - Propagates adding an id to slaves 362 * @bond_dev: bonding net device that got called 363 * @proto: network protocol ID 364 * @vid: vlan id being added 365 */ 366 static int bond_vlan_rx_add_vid(struct net_device *bond_dev, 367 __be16 proto, u16 vid) 368 { 369 struct bonding *bond = netdev_priv(bond_dev); 370 struct slave *slave, *rollback_slave; 371 struct list_head *iter; 372 int res; 373 374 bond_for_each_slave(bond, slave, iter) { 375 res = vlan_vid_add(slave->dev, proto, vid); 376 if (res) 377 goto unwind; 378 } 379 380 return 0; 381 382 unwind: 383 /* unwind to the slave that failed */ 384 bond_for_each_slave(bond, rollback_slave, iter) { 385 if (rollback_slave == slave) 386 break; 387 388 vlan_vid_del(rollback_slave->dev, proto, vid); 389 } 390 391 return res; 392 } 393 394 /** 395 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves 396 * @bond_dev: bonding net device that got called 397 * @proto: network protocol ID 398 * @vid: vlan id being removed 399 */ 400 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, 401 __be16 proto, u16 vid) 402 { 403 struct bonding *bond = netdev_priv(bond_dev); 404 struct list_head *iter; 405 struct slave *slave; 406 407 bond_for_each_slave(bond, slave, iter) 408 vlan_vid_del(slave->dev, proto, vid); 409 410 if (bond_is_lb(bond)) 411 bond_alb_clear_vlan(bond, vid); 412 413 return 0; 414 } 415 416 /*---------------------------------- XFRM -----------------------------------*/ 417 418 #ifdef CONFIG_XFRM_OFFLOAD 419 /** 420 * bond_ipsec_add_sa - program device with a security association 421 * @xs: pointer to transformer state struct 422 **/ 423 static int bond_ipsec_add_sa(struct xfrm_state *xs) 424 { 425 struct net_device *bond_dev = xs->xso.dev; 426 struct bond_ipsec *ipsec; 427 struct bonding *bond; 428 struct slave *slave; 429 int err; 430 431 if (!bond_dev) 432 return -EINVAL; 433 434 rcu_read_lock(); 435 bond = netdev_priv(bond_dev); 436 slave = rcu_dereference(bond->curr_active_slave); 437 if (!slave) { 438 rcu_read_unlock(); 439 return -ENODEV; 440 } 441 442 if (!slave->dev->xfrmdev_ops || 443 !slave->dev->xfrmdev_ops->xdo_dev_state_add || 444 netif_is_bond_master(slave->dev)) { 445 slave_warn(bond_dev, slave->dev, "Slave does not support ipsec offload\n"); 446 rcu_read_unlock(); 447 return -EINVAL; 448 } 449 450 ipsec = kmalloc(sizeof(*ipsec), GFP_ATOMIC); 451 if (!ipsec) { 452 rcu_read_unlock(); 453 return -ENOMEM; 454 } 455 xs->xso.real_dev = slave->dev; 456 457 err = slave->dev->xfrmdev_ops->xdo_dev_state_add(xs); 458 if (!err) { 459 ipsec->xs = xs; 460 INIT_LIST_HEAD(&ipsec->list); 461 spin_lock_bh(&bond->ipsec_lock); 462 list_add(&ipsec->list, &bond->ipsec_list); 463 spin_unlock_bh(&bond->ipsec_lock); 464 } else { 465 kfree(ipsec); 466 } 467 rcu_read_unlock(); 468 return err; 469 } 470 471 static void bond_ipsec_add_sa_all(struct bonding *bond) 472 { 473 struct net_device *bond_dev = bond->dev; 474 struct bond_ipsec *ipsec; 475 struct slave *slave; 476 477 rcu_read_lock(); 478 slave = rcu_dereference(bond->curr_active_slave); 479 if (!slave) 480 goto out; 481 482 if (!slave->dev->xfrmdev_ops || 483 !slave->dev->xfrmdev_ops->xdo_dev_state_add || 484 netif_is_bond_master(slave->dev)) { 485 spin_lock_bh(&bond->ipsec_lock); 486 if (!list_empty(&bond->ipsec_list)) 487 slave_warn(bond_dev, slave->dev, 488 "%s: no slave xdo_dev_state_add\n", 489 __func__); 490 spin_unlock_bh(&bond->ipsec_lock); 491 goto out; 492 } 493 494 spin_lock_bh(&bond->ipsec_lock); 495 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 496 ipsec->xs->xso.real_dev = slave->dev; 497 if (slave->dev->xfrmdev_ops->xdo_dev_state_add(ipsec->xs)) { 498 slave_warn(bond_dev, slave->dev, "%s: failed to add SA\n", __func__); 499 ipsec->xs->xso.real_dev = NULL; 500 } 501 } 502 spin_unlock_bh(&bond->ipsec_lock); 503 out: 504 rcu_read_unlock(); 505 } 506 507 /** 508 * bond_ipsec_del_sa - clear out this specific SA 509 * @xs: pointer to transformer state struct 510 **/ 511 static void bond_ipsec_del_sa(struct xfrm_state *xs) 512 { 513 struct net_device *bond_dev = xs->xso.dev; 514 struct bond_ipsec *ipsec; 515 struct bonding *bond; 516 struct slave *slave; 517 518 if (!bond_dev) 519 return; 520 521 rcu_read_lock(); 522 bond = netdev_priv(bond_dev); 523 slave = rcu_dereference(bond->curr_active_slave); 524 525 if (!slave) 526 goto out; 527 528 if (!xs->xso.real_dev) 529 goto out; 530 531 WARN_ON(xs->xso.real_dev != slave->dev); 532 533 if (!slave->dev->xfrmdev_ops || 534 !slave->dev->xfrmdev_ops->xdo_dev_state_delete || 535 netif_is_bond_master(slave->dev)) { 536 slave_warn(bond_dev, slave->dev, "%s: no slave xdo_dev_state_delete\n", __func__); 537 goto out; 538 } 539 540 slave->dev->xfrmdev_ops->xdo_dev_state_delete(xs); 541 out: 542 spin_lock_bh(&bond->ipsec_lock); 543 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 544 if (ipsec->xs == xs) { 545 list_del(&ipsec->list); 546 kfree(ipsec); 547 break; 548 } 549 } 550 spin_unlock_bh(&bond->ipsec_lock); 551 rcu_read_unlock(); 552 } 553 554 static void bond_ipsec_del_sa_all(struct bonding *bond) 555 { 556 struct net_device *bond_dev = bond->dev; 557 struct bond_ipsec *ipsec; 558 struct slave *slave; 559 560 rcu_read_lock(); 561 slave = rcu_dereference(bond->curr_active_slave); 562 if (!slave) { 563 rcu_read_unlock(); 564 return; 565 } 566 567 spin_lock_bh(&bond->ipsec_lock); 568 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 569 if (!ipsec->xs->xso.real_dev) 570 continue; 571 572 if (!slave->dev->xfrmdev_ops || 573 !slave->dev->xfrmdev_ops->xdo_dev_state_delete || 574 netif_is_bond_master(slave->dev)) { 575 slave_warn(bond_dev, slave->dev, 576 "%s: no slave xdo_dev_state_delete\n", 577 __func__); 578 } else { 579 slave->dev->xfrmdev_ops->xdo_dev_state_delete(ipsec->xs); 580 } 581 ipsec->xs->xso.real_dev = NULL; 582 } 583 spin_unlock_bh(&bond->ipsec_lock); 584 rcu_read_unlock(); 585 } 586 587 /** 588 * bond_ipsec_offload_ok - can this packet use the xfrm hw offload 589 * @skb: current data packet 590 * @xs: pointer to transformer state struct 591 **/ 592 static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs) 593 { 594 struct net_device *bond_dev = xs->xso.dev; 595 struct net_device *real_dev; 596 struct slave *curr_active; 597 struct bonding *bond; 598 int err; 599 600 bond = netdev_priv(bond_dev); 601 rcu_read_lock(); 602 curr_active = rcu_dereference(bond->curr_active_slave); 603 real_dev = curr_active->dev; 604 605 if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 606 err = false; 607 goto out; 608 } 609 610 if (!xs->xso.real_dev) { 611 err = false; 612 goto out; 613 } 614 615 if (!real_dev->xfrmdev_ops || 616 !real_dev->xfrmdev_ops->xdo_dev_offload_ok || 617 netif_is_bond_master(real_dev)) { 618 err = false; 619 goto out; 620 } 621 622 err = real_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs); 623 out: 624 rcu_read_unlock(); 625 return err; 626 } 627 628 static const struct xfrmdev_ops bond_xfrmdev_ops = { 629 .xdo_dev_state_add = bond_ipsec_add_sa, 630 .xdo_dev_state_delete = bond_ipsec_del_sa, 631 .xdo_dev_offload_ok = bond_ipsec_offload_ok, 632 }; 633 #endif /* CONFIG_XFRM_OFFLOAD */ 634 635 /*------------------------------- Link status -------------------------------*/ 636 637 /* Set the carrier state for the master according to the state of its 638 * slaves. If any slaves are up, the master is up. In 802.3ad mode, 639 * do special 802.3ad magic. 640 * 641 * Returns zero if carrier state does not change, nonzero if it does. 642 */ 643 int bond_set_carrier(struct bonding *bond) 644 { 645 struct list_head *iter; 646 struct slave *slave; 647 648 if (!bond_has_slaves(bond)) 649 goto down; 650 651 if (BOND_MODE(bond) == BOND_MODE_8023AD) 652 return bond_3ad_set_carrier(bond); 653 654 bond_for_each_slave(bond, slave, iter) { 655 if (slave->link == BOND_LINK_UP) { 656 if (!netif_carrier_ok(bond->dev)) { 657 netif_carrier_on(bond->dev); 658 return 1; 659 } 660 return 0; 661 } 662 } 663 664 down: 665 if (netif_carrier_ok(bond->dev)) { 666 netif_carrier_off(bond->dev); 667 return 1; 668 } 669 return 0; 670 } 671 672 /* Get link speed and duplex from the slave's base driver 673 * using ethtool. If for some reason the call fails or the 674 * values are invalid, set speed and duplex to -1, 675 * and return. Return 1 if speed or duplex settings are 676 * UNKNOWN; 0 otherwise. 677 */ 678 static int bond_update_speed_duplex(struct slave *slave) 679 { 680 struct net_device *slave_dev = slave->dev; 681 struct ethtool_link_ksettings ecmd; 682 int res; 683 684 slave->speed = SPEED_UNKNOWN; 685 slave->duplex = DUPLEX_UNKNOWN; 686 687 res = __ethtool_get_link_ksettings(slave_dev, &ecmd); 688 if (res < 0) 689 return 1; 690 if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1)) 691 return 1; 692 switch (ecmd.base.duplex) { 693 case DUPLEX_FULL: 694 case DUPLEX_HALF: 695 break; 696 default: 697 return 1; 698 } 699 700 slave->speed = ecmd.base.speed; 701 slave->duplex = ecmd.base.duplex; 702 703 return 0; 704 } 705 706 const char *bond_slave_link_status(s8 link) 707 { 708 switch (link) { 709 case BOND_LINK_UP: 710 return "up"; 711 case BOND_LINK_FAIL: 712 return "going down"; 713 case BOND_LINK_DOWN: 714 return "down"; 715 case BOND_LINK_BACK: 716 return "going back"; 717 default: 718 return "unknown"; 719 } 720 } 721 722 /* if <dev> supports MII link status reporting, check its link status. 723 * 724 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), 725 * depending upon the setting of the use_carrier parameter. 726 * 727 * Return either BMSR_LSTATUS, meaning that the link is up (or we 728 * can't tell and just pretend it is), or 0, meaning that the link is 729 * down. 730 * 731 * If reporting is non-zero, instead of faking link up, return -1 if 732 * both ETHTOOL and MII ioctls fail (meaning the device does not 733 * support them). If use_carrier is set, return whatever it says. 734 * It'd be nice if there was a good way to tell if a driver supports 735 * netif_carrier, but there really isn't. 736 */ 737 static int bond_check_dev_link(struct bonding *bond, 738 struct net_device *slave_dev, int reporting) 739 { 740 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 741 int (*ioctl)(struct net_device *, struct ifreq *, int); 742 struct ifreq ifr; 743 struct mii_ioctl_data *mii; 744 745 if (!reporting && !netif_running(slave_dev)) 746 return 0; 747 748 if (bond->params.use_carrier) 749 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; 750 751 /* Try to get link status using Ethtool first. */ 752 if (slave_dev->ethtool_ops->get_link) 753 return slave_dev->ethtool_ops->get_link(slave_dev) ? 754 BMSR_LSTATUS : 0; 755 756 /* Ethtool can't be used, fallback to MII ioctls. */ 757 ioctl = slave_ops->ndo_eth_ioctl; 758 if (ioctl) { 759 /* TODO: set pointer to correct ioctl on a per team member 760 * bases to make this more efficient. that is, once 761 * we determine the correct ioctl, we will always 762 * call it and not the others for that team 763 * member. 764 */ 765 766 /* We cannot assume that SIOCGMIIPHY will also read a 767 * register; not all network drivers (e.g., e100) 768 * support that. 769 */ 770 771 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ 772 strscpy_pad(ifr.ifr_name, slave_dev->name, IFNAMSIZ); 773 mii = if_mii(&ifr); 774 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) { 775 mii->reg_num = MII_BMSR; 776 if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0) 777 return mii->val_out & BMSR_LSTATUS; 778 } 779 } 780 781 /* If reporting, report that either there's no ndo_eth_ioctl, 782 * or both SIOCGMIIREG and get_link failed (meaning that we 783 * cannot report link status). If not reporting, pretend 784 * we're ok. 785 */ 786 return reporting ? -1 : BMSR_LSTATUS; 787 } 788 789 /*----------------------------- Multicast list ------------------------------*/ 790 791 /* Push the promiscuity flag down to appropriate slaves */ 792 static int bond_set_promiscuity(struct bonding *bond, int inc) 793 { 794 struct list_head *iter; 795 int err = 0; 796 797 if (bond_uses_primary(bond)) { 798 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 799 800 if (curr_active) 801 err = dev_set_promiscuity(curr_active->dev, inc); 802 } else { 803 struct slave *slave; 804 805 bond_for_each_slave(bond, slave, iter) { 806 err = dev_set_promiscuity(slave->dev, inc); 807 if (err) 808 return err; 809 } 810 } 811 return err; 812 } 813 814 /* Push the allmulti flag down to all slaves */ 815 static int bond_set_allmulti(struct bonding *bond, int inc) 816 { 817 struct list_head *iter; 818 int err = 0; 819 820 if (bond_uses_primary(bond)) { 821 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 822 823 if (curr_active) 824 err = dev_set_allmulti(curr_active->dev, inc); 825 } else { 826 struct slave *slave; 827 828 bond_for_each_slave(bond, slave, iter) { 829 err = dev_set_allmulti(slave->dev, inc); 830 if (err) 831 return err; 832 } 833 } 834 return err; 835 } 836 837 /* Retrieve the list of registered multicast addresses for the bonding 838 * device and retransmit an IGMP JOIN request to the current active 839 * slave. 840 */ 841 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work) 842 { 843 struct bonding *bond = container_of(work, struct bonding, 844 mcast_work.work); 845 846 if (!rtnl_trylock()) { 847 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 848 return; 849 } 850 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev); 851 852 if (bond->igmp_retrans > 1) { 853 bond->igmp_retrans--; 854 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); 855 } 856 rtnl_unlock(); 857 } 858 859 /* Flush bond's hardware addresses from slave */ 860 static void bond_hw_addr_flush(struct net_device *bond_dev, 861 struct net_device *slave_dev) 862 { 863 struct bonding *bond = netdev_priv(bond_dev); 864 865 dev_uc_unsync(slave_dev, bond_dev); 866 dev_mc_unsync(slave_dev, bond_dev); 867 868 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 869 /* del lacpdu mc addr from mc list */ 870 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 871 872 dev_mc_del(slave_dev, lacpdu_multicast); 873 } 874 } 875 876 /*--------------------------- Active slave change ---------------------------*/ 877 878 /* Update the hardware address list and promisc/allmulti for the new and 879 * old active slaves (if any). Modes that are not using primary keep all 880 * slaves up date at all times; only the modes that use primary need to call 881 * this function to swap these settings during a failover. 882 */ 883 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active, 884 struct slave *old_active) 885 { 886 if (old_active) { 887 if (bond->dev->flags & IFF_PROMISC) 888 dev_set_promiscuity(old_active->dev, -1); 889 890 if (bond->dev->flags & IFF_ALLMULTI) 891 dev_set_allmulti(old_active->dev, -1); 892 893 bond_hw_addr_flush(bond->dev, old_active->dev); 894 } 895 896 if (new_active) { 897 /* FIXME: Signal errors upstream. */ 898 if (bond->dev->flags & IFF_PROMISC) 899 dev_set_promiscuity(new_active->dev, 1); 900 901 if (bond->dev->flags & IFF_ALLMULTI) 902 dev_set_allmulti(new_active->dev, 1); 903 904 netif_addr_lock_bh(bond->dev); 905 dev_uc_sync(new_active->dev, bond->dev); 906 dev_mc_sync(new_active->dev, bond->dev); 907 netif_addr_unlock_bh(bond->dev); 908 } 909 } 910 911 /** 912 * bond_set_dev_addr - clone slave's address to bond 913 * @bond_dev: bond net device 914 * @slave_dev: slave net device 915 * 916 * Should be called with RTNL held. 917 */ 918 static int bond_set_dev_addr(struct net_device *bond_dev, 919 struct net_device *slave_dev) 920 { 921 int err; 922 923 slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n", 924 bond_dev, slave_dev, slave_dev->addr_len); 925 err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL); 926 if (err) 927 return err; 928 929 __dev_addr_set(bond_dev, slave_dev->dev_addr, slave_dev->addr_len); 930 bond_dev->addr_assign_type = NET_ADDR_STOLEN; 931 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev); 932 return 0; 933 } 934 935 static struct slave *bond_get_old_active(struct bonding *bond, 936 struct slave *new_active) 937 { 938 struct slave *slave; 939 struct list_head *iter; 940 941 bond_for_each_slave(bond, slave, iter) { 942 if (slave == new_active) 943 continue; 944 945 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr)) 946 return slave; 947 } 948 949 return NULL; 950 } 951 952 /* bond_do_fail_over_mac 953 * 954 * Perform special MAC address swapping for fail_over_mac settings 955 * 956 * Called with RTNL 957 */ 958 static void bond_do_fail_over_mac(struct bonding *bond, 959 struct slave *new_active, 960 struct slave *old_active) 961 { 962 u8 tmp_mac[MAX_ADDR_LEN]; 963 struct sockaddr_storage ss; 964 int rv; 965 966 switch (bond->params.fail_over_mac) { 967 case BOND_FOM_ACTIVE: 968 if (new_active) { 969 rv = bond_set_dev_addr(bond->dev, new_active->dev); 970 if (rv) 971 slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n", 972 -rv); 973 } 974 break; 975 case BOND_FOM_FOLLOW: 976 /* if new_active && old_active, swap them 977 * if just old_active, do nothing (going to no active slave) 978 * if just new_active, set new_active to bond's MAC 979 */ 980 if (!new_active) 981 return; 982 983 if (!old_active) 984 old_active = bond_get_old_active(bond, new_active); 985 986 if (old_active) { 987 bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr, 988 new_active->dev->addr_len); 989 bond_hw_addr_copy(ss.__data, 990 old_active->dev->dev_addr, 991 old_active->dev->addr_len); 992 ss.ss_family = new_active->dev->type; 993 } else { 994 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr, 995 bond->dev->addr_len); 996 ss.ss_family = bond->dev->type; 997 } 998 999 rv = dev_set_mac_address(new_active->dev, 1000 (struct sockaddr *)&ss, NULL); 1001 if (rv) { 1002 slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n", 1003 -rv); 1004 goto out; 1005 } 1006 1007 if (!old_active) 1008 goto out; 1009 1010 bond_hw_addr_copy(ss.__data, tmp_mac, 1011 new_active->dev->addr_len); 1012 ss.ss_family = old_active->dev->type; 1013 1014 rv = dev_set_mac_address(old_active->dev, 1015 (struct sockaddr *)&ss, NULL); 1016 if (rv) 1017 slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n", 1018 -rv); 1019 out: 1020 break; 1021 default: 1022 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n", 1023 bond->params.fail_over_mac); 1024 break; 1025 } 1026 1027 } 1028 1029 /** 1030 * bond_choose_primary_or_current - select the primary or high priority slave 1031 * @bond: our bonding struct 1032 * 1033 * - Check if there is a primary link. If the primary link was set and is up, 1034 * go on and do link reselection. 1035 * 1036 * - If primary link is not set or down, find the highest priority link. 1037 * If the highest priority link is not current slave, set it as primary 1038 * link and do link reselection. 1039 */ 1040 static struct slave *bond_choose_primary_or_current(struct bonding *bond) 1041 { 1042 struct slave *prim = rtnl_dereference(bond->primary_slave); 1043 struct slave *curr = rtnl_dereference(bond->curr_active_slave); 1044 struct slave *slave, *hprio = NULL; 1045 struct list_head *iter; 1046 1047 if (!prim || prim->link != BOND_LINK_UP) { 1048 bond_for_each_slave(bond, slave, iter) { 1049 if (slave->link == BOND_LINK_UP) { 1050 hprio = hprio ?: slave; 1051 if (slave->prio > hprio->prio) 1052 hprio = slave; 1053 } 1054 } 1055 1056 if (hprio && hprio != curr) { 1057 prim = hprio; 1058 goto link_reselect; 1059 } 1060 1061 if (!curr || curr->link != BOND_LINK_UP) 1062 return NULL; 1063 return curr; 1064 } 1065 1066 if (bond->force_primary) { 1067 bond->force_primary = false; 1068 return prim; 1069 } 1070 1071 link_reselect: 1072 if (!curr || curr->link != BOND_LINK_UP) 1073 return prim; 1074 1075 /* At this point, prim and curr are both up */ 1076 switch (bond->params.primary_reselect) { 1077 case BOND_PRI_RESELECT_ALWAYS: 1078 return prim; 1079 case BOND_PRI_RESELECT_BETTER: 1080 if (prim->speed < curr->speed) 1081 return curr; 1082 if (prim->speed == curr->speed && prim->duplex <= curr->duplex) 1083 return curr; 1084 return prim; 1085 case BOND_PRI_RESELECT_FAILURE: 1086 return curr; 1087 default: 1088 netdev_err(bond->dev, "impossible primary_reselect %d\n", 1089 bond->params.primary_reselect); 1090 return curr; 1091 } 1092 } 1093 1094 /** 1095 * bond_find_best_slave - select the best available slave to be the active one 1096 * @bond: our bonding struct 1097 */ 1098 static struct slave *bond_find_best_slave(struct bonding *bond) 1099 { 1100 struct slave *slave, *bestslave = NULL; 1101 struct list_head *iter; 1102 int mintime = bond->params.updelay; 1103 1104 slave = bond_choose_primary_or_current(bond); 1105 if (slave) 1106 return slave; 1107 1108 bond_for_each_slave(bond, slave, iter) { 1109 if (slave->link == BOND_LINK_UP) 1110 return slave; 1111 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) && 1112 slave->delay < mintime) { 1113 mintime = slave->delay; 1114 bestslave = slave; 1115 } 1116 } 1117 1118 return bestslave; 1119 } 1120 1121 static bool bond_should_notify_peers(struct bonding *bond) 1122 { 1123 struct slave *slave; 1124 1125 rcu_read_lock(); 1126 slave = rcu_dereference(bond->curr_active_slave); 1127 rcu_read_unlock(); 1128 1129 if (!slave || !bond->send_peer_notif || 1130 bond->send_peer_notif % 1131 max(1, bond->params.peer_notif_delay) != 0 || 1132 !netif_carrier_ok(bond->dev) || 1133 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) 1134 return false; 1135 1136 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n", 1137 slave ? slave->dev->name : "NULL"); 1138 1139 return true; 1140 } 1141 1142 /** 1143 * bond_change_active_slave - change the active slave into the specified one 1144 * @bond: our bonding struct 1145 * @new_active: the new slave to make the active one 1146 * 1147 * Set the new slave to the bond's settings and unset them on the old 1148 * curr_active_slave. 1149 * Setting include flags, mc-list, promiscuity, allmulti, etc. 1150 * 1151 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, 1152 * because it is apparently the best available slave we have, even though its 1153 * updelay hasn't timed out yet. 1154 * 1155 * Caller must hold RTNL. 1156 */ 1157 void bond_change_active_slave(struct bonding *bond, struct slave *new_active) 1158 { 1159 struct slave *old_active; 1160 1161 ASSERT_RTNL(); 1162 1163 old_active = rtnl_dereference(bond->curr_active_slave); 1164 1165 if (old_active == new_active) 1166 return; 1167 1168 #ifdef CONFIG_XFRM_OFFLOAD 1169 bond_ipsec_del_sa_all(bond); 1170 #endif /* CONFIG_XFRM_OFFLOAD */ 1171 1172 if (new_active) { 1173 new_active->last_link_up = jiffies; 1174 1175 if (new_active->link == BOND_LINK_BACK) { 1176 if (bond_uses_primary(bond)) { 1177 slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n", 1178 (bond->params.updelay - new_active->delay) * bond->params.miimon); 1179 } 1180 1181 new_active->delay = 0; 1182 bond_set_slave_link_state(new_active, BOND_LINK_UP, 1183 BOND_SLAVE_NOTIFY_NOW); 1184 1185 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1186 bond_3ad_handle_link_change(new_active, BOND_LINK_UP); 1187 1188 if (bond_is_lb(bond)) 1189 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); 1190 } else { 1191 if (bond_uses_primary(bond)) 1192 slave_info(bond->dev, new_active->dev, "making interface the new active one\n"); 1193 } 1194 } 1195 1196 if (bond_uses_primary(bond)) 1197 bond_hw_addr_swap(bond, new_active, old_active); 1198 1199 if (bond_is_lb(bond)) { 1200 bond_alb_handle_active_change(bond, new_active); 1201 if (old_active) 1202 bond_set_slave_inactive_flags(old_active, 1203 BOND_SLAVE_NOTIFY_NOW); 1204 if (new_active) 1205 bond_set_slave_active_flags(new_active, 1206 BOND_SLAVE_NOTIFY_NOW); 1207 } else { 1208 rcu_assign_pointer(bond->curr_active_slave, new_active); 1209 } 1210 1211 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) { 1212 if (old_active) 1213 bond_set_slave_inactive_flags(old_active, 1214 BOND_SLAVE_NOTIFY_NOW); 1215 1216 if (new_active) { 1217 bool should_notify_peers = false; 1218 1219 bond_set_slave_active_flags(new_active, 1220 BOND_SLAVE_NOTIFY_NOW); 1221 1222 if (bond->params.fail_over_mac) 1223 bond_do_fail_over_mac(bond, new_active, 1224 old_active); 1225 1226 if (netif_running(bond->dev)) { 1227 bond->send_peer_notif = 1228 bond->params.num_peer_notif * 1229 max(1, bond->params.peer_notif_delay); 1230 should_notify_peers = 1231 bond_should_notify_peers(bond); 1232 } 1233 1234 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev); 1235 if (should_notify_peers) { 1236 bond->send_peer_notif--; 1237 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 1238 bond->dev); 1239 } 1240 } 1241 } 1242 1243 #ifdef CONFIG_XFRM_OFFLOAD 1244 bond_ipsec_add_sa_all(bond); 1245 #endif /* CONFIG_XFRM_OFFLOAD */ 1246 1247 /* resend IGMP joins since active slave has changed or 1248 * all were sent on curr_active_slave. 1249 * resend only if bond is brought up with the affected 1250 * bonding modes and the retransmission is enabled 1251 */ 1252 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && 1253 ((bond_uses_primary(bond) && new_active) || 1254 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) { 1255 bond->igmp_retrans = bond->params.resend_igmp; 1256 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 1257 } 1258 } 1259 1260 /** 1261 * bond_select_active_slave - select a new active slave, if needed 1262 * @bond: our bonding struct 1263 * 1264 * This functions should be called when one of the following occurs: 1265 * - The old curr_active_slave has been released or lost its link. 1266 * - The primary_slave has got its link back. 1267 * - A slave has got its link back and there's no old curr_active_slave. 1268 * 1269 * Caller must hold RTNL. 1270 */ 1271 void bond_select_active_slave(struct bonding *bond) 1272 { 1273 struct slave *best_slave; 1274 int rv; 1275 1276 ASSERT_RTNL(); 1277 1278 best_slave = bond_find_best_slave(bond); 1279 if (best_slave != rtnl_dereference(bond->curr_active_slave)) { 1280 bond_change_active_slave(bond, best_slave); 1281 rv = bond_set_carrier(bond); 1282 if (!rv) 1283 return; 1284 1285 if (netif_carrier_ok(bond->dev)) 1286 netdev_info(bond->dev, "active interface up!\n"); 1287 else 1288 netdev_info(bond->dev, "now running without any active interface!\n"); 1289 } 1290 } 1291 1292 #ifdef CONFIG_NET_POLL_CONTROLLER 1293 static inline int slave_enable_netpoll(struct slave *slave) 1294 { 1295 struct netpoll *np; 1296 int err = 0; 1297 1298 np = kzalloc(sizeof(*np), GFP_KERNEL); 1299 err = -ENOMEM; 1300 if (!np) 1301 goto out; 1302 1303 err = __netpoll_setup(np, slave->dev); 1304 if (err) { 1305 kfree(np); 1306 goto out; 1307 } 1308 slave->np = np; 1309 out: 1310 return err; 1311 } 1312 static inline void slave_disable_netpoll(struct slave *slave) 1313 { 1314 struct netpoll *np = slave->np; 1315 1316 if (!np) 1317 return; 1318 1319 slave->np = NULL; 1320 1321 __netpoll_free(np); 1322 } 1323 1324 static void bond_poll_controller(struct net_device *bond_dev) 1325 { 1326 struct bonding *bond = netdev_priv(bond_dev); 1327 struct slave *slave = NULL; 1328 struct list_head *iter; 1329 struct ad_info ad_info; 1330 1331 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1332 if (bond_3ad_get_active_agg_info(bond, &ad_info)) 1333 return; 1334 1335 bond_for_each_slave_rcu(bond, slave, iter) { 1336 if (!bond_slave_is_up(slave)) 1337 continue; 1338 1339 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1340 struct aggregator *agg = 1341 SLAVE_AD_INFO(slave)->port.aggregator; 1342 1343 if (agg && 1344 agg->aggregator_identifier != ad_info.aggregator_id) 1345 continue; 1346 } 1347 1348 netpoll_poll_dev(slave->dev); 1349 } 1350 } 1351 1352 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1353 { 1354 struct bonding *bond = netdev_priv(bond_dev); 1355 struct list_head *iter; 1356 struct slave *slave; 1357 1358 bond_for_each_slave(bond, slave, iter) 1359 if (bond_slave_is_up(slave)) 1360 slave_disable_netpoll(slave); 1361 } 1362 1363 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) 1364 { 1365 struct bonding *bond = netdev_priv(dev); 1366 struct list_head *iter; 1367 struct slave *slave; 1368 int err = 0; 1369 1370 bond_for_each_slave(bond, slave, iter) { 1371 err = slave_enable_netpoll(slave); 1372 if (err) { 1373 bond_netpoll_cleanup(dev); 1374 break; 1375 } 1376 } 1377 return err; 1378 } 1379 #else 1380 static inline int slave_enable_netpoll(struct slave *slave) 1381 { 1382 return 0; 1383 } 1384 static inline void slave_disable_netpoll(struct slave *slave) 1385 { 1386 } 1387 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1388 { 1389 } 1390 #endif 1391 1392 /*---------------------------------- IOCTL ----------------------------------*/ 1393 1394 static netdev_features_t bond_fix_features(struct net_device *dev, 1395 netdev_features_t features) 1396 { 1397 struct bonding *bond = netdev_priv(dev); 1398 struct list_head *iter; 1399 netdev_features_t mask; 1400 struct slave *slave; 1401 1402 #if IS_ENABLED(CONFIG_TLS_DEVICE) 1403 if (bond_sk_check(bond)) 1404 features |= BOND_TLS_FEATURES; 1405 else 1406 features &= ~BOND_TLS_FEATURES; 1407 #endif 1408 1409 mask = features; 1410 1411 features &= ~NETIF_F_ONE_FOR_ALL; 1412 features |= NETIF_F_ALL_FOR_ALL; 1413 1414 bond_for_each_slave(bond, slave, iter) { 1415 features = netdev_increment_features(features, 1416 slave->dev->features, 1417 mask); 1418 } 1419 features = netdev_add_tso_features(features, mask); 1420 1421 return features; 1422 } 1423 1424 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1425 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | \ 1426 NETIF_F_HIGHDMA | NETIF_F_LRO) 1427 1428 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1429 NETIF_F_RXCSUM | NETIF_F_GSO_SOFTWARE) 1430 1431 #define BOND_MPLS_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1432 NETIF_F_GSO_SOFTWARE) 1433 1434 1435 static void bond_compute_features(struct bonding *bond) 1436 { 1437 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE | 1438 IFF_XMIT_DST_RELEASE_PERM; 1439 netdev_features_t vlan_features = BOND_VLAN_FEATURES; 1440 netdev_features_t enc_features = BOND_ENC_FEATURES; 1441 #ifdef CONFIG_XFRM_OFFLOAD 1442 netdev_features_t xfrm_features = BOND_XFRM_FEATURES; 1443 #endif /* CONFIG_XFRM_OFFLOAD */ 1444 netdev_features_t mpls_features = BOND_MPLS_FEATURES; 1445 struct net_device *bond_dev = bond->dev; 1446 struct list_head *iter; 1447 struct slave *slave; 1448 unsigned short max_hard_header_len = ETH_HLEN; 1449 unsigned int tso_max_size = TSO_MAX_SIZE; 1450 u16 tso_max_segs = TSO_MAX_SEGS; 1451 1452 if (!bond_has_slaves(bond)) 1453 goto done; 1454 vlan_features &= NETIF_F_ALL_FOR_ALL; 1455 mpls_features &= NETIF_F_ALL_FOR_ALL; 1456 1457 bond_for_each_slave(bond, slave, iter) { 1458 vlan_features = netdev_increment_features(vlan_features, 1459 slave->dev->vlan_features, BOND_VLAN_FEATURES); 1460 1461 enc_features = netdev_increment_features(enc_features, 1462 slave->dev->hw_enc_features, 1463 BOND_ENC_FEATURES); 1464 1465 #ifdef CONFIG_XFRM_OFFLOAD 1466 xfrm_features = netdev_increment_features(xfrm_features, 1467 slave->dev->hw_enc_features, 1468 BOND_XFRM_FEATURES); 1469 #endif /* CONFIG_XFRM_OFFLOAD */ 1470 1471 mpls_features = netdev_increment_features(mpls_features, 1472 slave->dev->mpls_features, 1473 BOND_MPLS_FEATURES); 1474 1475 dst_release_flag &= slave->dev->priv_flags; 1476 if (slave->dev->hard_header_len > max_hard_header_len) 1477 max_hard_header_len = slave->dev->hard_header_len; 1478 1479 tso_max_size = min(tso_max_size, slave->dev->tso_max_size); 1480 tso_max_segs = min(tso_max_segs, slave->dev->tso_max_segs); 1481 } 1482 bond_dev->hard_header_len = max_hard_header_len; 1483 1484 done: 1485 bond_dev->vlan_features = vlan_features; 1486 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL | 1487 NETIF_F_HW_VLAN_CTAG_TX | 1488 NETIF_F_HW_VLAN_STAG_TX; 1489 #ifdef CONFIG_XFRM_OFFLOAD 1490 bond_dev->hw_enc_features |= xfrm_features; 1491 #endif /* CONFIG_XFRM_OFFLOAD */ 1492 bond_dev->mpls_features = mpls_features; 1493 netif_set_tso_max_segs(bond_dev, tso_max_segs); 1494 netif_set_tso_max_size(bond_dev, tso_max_size); 1495 1496 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1497 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) && 1498 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM)) 1499 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE; 1500 1501 netdev_change_features(bond_dev); 1502 } 1503 1504 static void bond_setup_by_slave(struct net_device *bond_dev, 1505 struct net_device *slave_dev) 1506 { 1507 bond_dev->header_ops = slave_dev->header_ops; 1508 1509 bond_dev->type = slave_dev->type; 1510 bond_dev->hard_header_len = slave_dev->hard_header_len; 1511 bond_dev->needed_headroom = slave_dev->needed_headroom; 1512 bond_dev->addr_len = slave_dev->addr_len; 1513 1514 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1515 slave_dev->addr_len); 1516 } 1517 1518 /* On bonding slaves other than the currently active slave, suppress 1519 * duplicates except for alb non-mcast/bcast. 1520 */ 1521 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1522 struct slave *slave, 1523 struct bonding *bond) 1524 { 1525 if (bond_is_slave_inactive(slave)) { 1526 if (BOND_MODE(bond) == BOND_MODE_ALB && 1527 skb->pkt_type != PACKET_BROADCAST && 1528 skb->pkt_type != PACKET_MULTICAST) 1529 return false; 1530 return true; 1531 } 1532 return false; 1533 } 1534 1535 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1536 { 1537 struct sk_buff *skb = *pskb; 1538 struct slave *slave; 1539 struct bonding *bond; 1540 int (*recv_probe)(const struct sk_buff *, struct bonding *, 1541 struct slave *); 1542 int ret = RX_HANDLER_ANOTHER; 1543 1544 skb = skb_share_check(skb, GFP_ATOMIC); 1545 if (unlikely(!skb)) 1546 return RX_HANDLER_CONSUMED; 1547 1548 *pskb = skb; 1549 1550 slave = bond_slave_get_rcu(skb->dev); 1551 bond = slave->bond; 1552 1553 recv_probe = READ_ONCE(bond->recv_probe); 1554 if (recv_probe) { 1555 ret = recv_probe(skb, bond, slave); 1556 if (ret == RX_HANDLER_CONSUMED) { 1557 consume_skb(skb); 1558 return ret; 1559 } 1560 } 1561 1562 /* 1563 * For packets determined by bond_should_deliver_exact_match() call to 1564 * be suppressed we want to make an exception for link-local packets. 1565 * This is necessary for e.g. LLDP daemons to be able to monitor 1566 * inactive slave links without being forced to bind to them 1567 * explicitly. 1568 * 1569 * At the same time, packets that are passed to the bonding master 1570 * (including link-local ones) can have their originating interface 1571 * determined via PACKET_ORIGDEV socket option. 1572 */ 1573 if (bond_should_deliver_exact_match(skb, slave, bond)) { 1574 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest)) 1575 return RX_HANDLER_PASS; 1576 return RX_HANDLER_EXACT; 1577 } 1578 1579 skb->dev = bond->dev; 1580 1581 if (BOND_MODE(bond) == BOND_MODE_ALB && 1582 netif_is_bridge_port(bond->dev) && 1583 skb->pkt_type == PACKET_HOST) { 1584 1585 if (unlikely(skb_cow_head(skb, 1586 skb->data - skb_mac_header(skb)))) { 1587 kfree_skb(skb); 1588 return RX_HANDLER_CONSUMED; 1589 } 1590 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, 1591 bond->dev->addr_len); 1592 } 1593 1594 return ret; 1595 } 1596 1597 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond) 1598 { 1599 switch (BOND_MODE(bond)) { 1600 case BOND_MODE_ROUNDROBIN: 1601 return NETDEV_LAG_TX_TYPE_ROUNDROBIN; 1602 case BOND_MODE_ACTIVEBACKUP: 1603 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP; 1604 case BOND_MODE_BROADCAST: 1605 return NETDEV_LAG_TX_TYPE_BROADCAST; 1606 case BOND_MODE_XOR: 1607 case BOND_MODE_8023AD: 1608 return NETDEV_LAG_TX_TYPE_HASH; 1609 default: 1610 return NETDEV_LAG_TX_TYPE_UNKNOWN; 1611 } 1612 } 1613 1614 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond, 1615 enum netdev_lag_tx_type type) 1616 { 1617 if (type != NETDEV_LAG_TX_TYPE_HASH) 1618 return NETDEV_LAG_HASH_NONE; 1619 1620 switch (bond->params.xmit_policy) { 1621 case BOND_XMIT_POLICY_LAYER2: 1622 return NETDEV_LAG_HASH_L2; 1623 case BOND_XMIT_POLICY_LAYER34: 1624 return NETDEV_LAG_HASH_L34; 1625 case BOND_XMIT_POLICY_LAYER23: 1626 return NETDEV_LAG_HASH_L23; 1627 case BOND_XMIT_POLICY_ENCAP23: 1628 return NETDEV_LAG_HASH_E23; 1629 case BOND_XMIT_POLICY_ENCAP34: 1630 return NETDEV_LAG_HASH_E34; 1631 case BOND_XMIT_POLICY_VLAN_SRCMAC: 1632 return NETDEV_LAG_HASH_VLAN_SRCMAC; 1633 default: 1634 return NETDEV_LAG_HASH_UNKNOWN; 1635 } 1636 } 1637 1638 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave, 1639 struct netlink_ext_ack *extack) 1640 { 1641 struct netdev_lag_upper_info lag_upper_info; 1642 enum netdev_lag_tx_type type; 1643 1644 type = bond_lag_tx_type(bond); 1645 lag_upper_info.tx_type = type; 1646 lag_upper_info.hash_type = bond_lag_hash_type(bond, type); 1647 1648 return netdev_master_upper_dev_link(slave->dev, bond->dev, slave, 1649 &lag_upper_info, extack); 1650 } 1651 1652 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave) 1653 { 1654 netdev_upper_dev_unlink(slave->dev, bond->dev); 1655 slave->dev->flags &= ~IFF_SLAVE; 1656 } 1657 1658 static void slave_kobj_release(struct kobject *kobj) 1659 { 1660 struct slave *slave = to_slave(kobj); 1661 struct bonding *bond = bond_get_bond_by_slave(slave); 1662 1663 cancel_delayed_work_sync(&slave->notify_work); 1664 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1665 kfree(SLAVE_AD_INFO(slave)); 1666 1667 kfree(slave); 1668 } 1669 1670 static struct kobj_type slave_ktype = { 1671 .release = slave_kobj_release, 1672 #ifdef CONFIG_SYSFS 1673 .sysfs_ops = &slave_sysfs_ops, 1674 #endif 1675 }; 1676 1677 static int bond_kobj_init(struct slave *slave) 1678 { 1679 int err; 1680 1681 err = kobject_init_and_add(&slave->kobj, &slave_ktype, 1682 &(slave->dev->dev.kobj), "bonding_slave"); 1683 if (err) 1684 kobject_put(&slave->kobj); 1685 1686 return err; 1687 } 1688 1689 static struct slave *bond_alloc_slave(struct bonding *bond, 1690 struct net_device *slave_dev) 1691 { 1692 struct slave *slave = NULL; 1693 1694 slave = kzalloc(sizeof(*slave), GFP_KERNEL); 1695 if (!slave) 1696 return NULL; 1697 1698 slave->bond = bond; 1699 slave->dev = slave_dev; 1700 INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work); 1701 1702 if (bond_kobj_init(slave)) 1703 return NULL; 1704 1705 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1706 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info), 1707 GFP_KERNEL); 1708 if (!SLAVE_AD_INFO(slave)) { 1709 kobject_put(&slave->kobj); 1710 return NULL; 1711 } 1712 } 1713 1714 return slave; 1715 } 1716 1717 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info) 1718 { 1719 info->bond_mode = BOND_MODE(bond); 1720 info->miimon = bond->params.miimon; 1721 info->num_slaves = bond->slave_cnt; 1722 } 1723 1724 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info) 1725 { 1726 strcpy(info->slave_name, slave->dev->name); 1727 info->link = slave->link; 1728 info->state = bond_slave_state(slave); 1729 info->link_failure_count = slave->link_failure_count; 1730 } 1731 1732 static void bond_netdev_notify_work(struct work_struct *_work) 1733 { 1734 struct slave *slave = container_of(_work, struct slave, 1735 notify_work.work); 1736 1737 if (rtnl_trylock()) { 1738 struct netdev_bonding_info binfo; 1739 1740 bond_fill_ifslave(slave, &binfo.slave); 1741 bond_fill_ifbond(slave->bond, &binfo.master); 1742 netdev_bonding_info_change(slave->dev, &binfo); 1743 rtnl_unlock(); 1744 } else { 1745 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1); 1746 } 1747 } 1748 1749 void bond_queue_slave_event(struct slave *slave) 1750 { 1751 queue_delayed_work(slave->bond->wq, &slave->notify_work, 0); 1752 } 1753 1754 void bond_lower_state_changed(struct slave *slave) 1755 { 1756 struct netdev_lag_lower_state_info info; 1757 1758 info.link_up = slave->link == BOND_LINK_UP || 1759 slave->link == BOND_LINK_FAIL; 1760 info.tx_enabled = bond_is_active_slave(slave); 1761 netdev_lower_state_changed(slave->dev, &info); 1762 } 1763 1764 #define BOND_NL_ERR(bond_dev, extack, errmsg) do { \ 1765 if (extack) \ 1766 NL_SET_ERR_MSG(extack, errmsg); \ 1767 else \ 1768 netdev_err(bond_dev, "Error: %s\n", errmsg); \ 1769 } while (0) 1770 1771 #define SLAVE_NL_ERR(bond_dev, slave_dev, extack, errmsg) do { \ 1772 if (extack) \ 1773 NL_SET_ERR_MSG(extack, errmsg); \ 1774 else \ 1775 slave_err(bond_dev, slave_dev, "Error: %s\n", errmsg); \ 1776 } while (0) 1777 1778 /* enslave device <slave> to bond device <master> */ 1779 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev, 1780 struct netlink_ext_ack *extack) 1781 { 1782 struct bonding *bond = netdev_priv(bond_dev); 1783 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1784 struct slave *new_slave = NULL, *prev_slave; 1785 struct sockaddr_storage ss; 1786 int link_reporting; 1787 int res = 0, i; 1788 1789 if (slave_dev->flags & IFF_MASTER && 1790 !netif_is_bond_master(slave_dev)) { 1791 BOND_NL_ERR(bond_dev, extack, 1792 "Device type (master device) cannot be enslaved"); 1793 return -EPERM; 1794 } 1795 1796 if (!bond->params.use_carrier && 1797 slave_dev->ethtool_ops->get_link == NULL && 1798 slave_ops->ndo_eth_ioctl == NULL) { 1799 slave_warn(bond_dev, slave_dev, "no link monitoring support\n"); 1800 } 1801 1802 /* already in-use? */ 1803 if (netdev_is_rx_handler_busy(slave_dev)) { 1804 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1805 "Device is in use and cannot be enslaved"); 1806 return -EBUSY; 1807 } 1808 1809 if (bond_dev == slave_dev) { 1810 BOND_NL_ERR(bond_dev, extack, "Cannot enslave bond to itself."); 1811 return -EPERM; 1812 } 1813 1814 /* vlan challenged mutual exclusion */ 1815 /* no need to lock since we're protected by rtnl_lock */ 1816 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1817 slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n"); 1818 if (vlan_uses_dev(bond_dev)) { 1819 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1820 "Can not enslave VLAN challenged device to VLAN enabled bond"); 1821 return -EPERM; 1822 } else { 1823 slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n"); 1824 } 1825 } else { 1826 slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n"); 1827 } 1828 1829 if (slave_dev->features & NETIF_F_HW_ESP) 1830 slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n"); 1831 1832 /* Old ifenslave binaries are no longer supported. These can 1833 * be identified with moderate accuracy by the state of the slave: 1834 * the current ifenslave will set the interface down prior to 1835 * enslaving it; the old ifenslave will not. 1836 */ 1837 if (slave_dev->flags & IFF_UP) { 1838 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1839 "Device can not be enslaved while up"); 1840 return -EPERM; 1841 } 1842 1843 /* set bonding device ether type by slave - bonding netdevices are 1844 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1845 * there is a need to override some of the type dependent attribs/funcs. 1846 * 1847 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1848 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1849 */ 1850 if (!bond_has_slaves(bond)) { 1851 if (bond_dev->type != slave_dev->type) { 1852 slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n", 1853 bond_dev->type, slave_dev->type); 1854 1855 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, 1856 bond_dev); 1857 res = notifier_to_errno(res); 1858 if (res) { 1859 slave_err(bond_dev, slave_dev, "refused to change device type\n"); 1860 return -EBUSY; 1861 } 1862 1863 /* Flush unicast and multicast addresses */ 1864 dev_uc_flush(bond_dev); 1865 dev_mc_flush(bond_dev); 1866 1867 if (slave_dev->type != ARPHRD_ETHER) 1868 bond_setup_by_slave(bond_dev, slave_dev); 1869 else { 1870 ether_setup(bond_dev); 1871 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1872 } 1873 1874 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, 1875 bond_dev); 1876 } 1877 } else if (bond_dev->type != slave_dev->type) { 1878 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1879 "Device type is different from other slaves"); 1880 return -EINVAL; 1881 } 1882 1883 if (slave_dev->type == ARPHRD_INFINIBAND && 1884 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1885 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1886 "Only active-backup mode is supported for infiniband slaves"); 1887 res = -EOPNOTSUPP; 1888 goto err_undo_flags; 1889 } 1890 1891 if (!slave_ops->ndo_set_mac_address || 1892 slave_dev->type == ARPHRD_INFINIBAND) { 1893 slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n"); 1894 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP && 1895 bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1896 if (!bond_has_slaves(bond)) { 1897 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1898 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n"); 1899 } else { 1900 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1901 "Slave device does not support setting the MAC address, but fail_over_mac is not set to active"); 1902 res = -EOPNOTSUPP; 1903 goto err_undo_flags; 1904 } 1905 } 1906 } 1907 1908 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1909 1910 /* If this is the first slave, then we need to set the master's hardware 1911 * address to be the same as the slave's. 1912 */ 1913 if (!bond_has_slaves(bond) && 1914 bond->dev->addr_assign_type == NET_ADDR_RANDOM) { 1915 res = bond_set_dev_addr(bond->dev, slave_dev); 1916 if (res) 1917 goto err_undo_flags; 1918 } 1919 1920 new_slave = bond_alloc_slave(bond, slave_dev); 1921 if (!new_slave) { 1922 res = -ENOMEM; 1923 goto err_undo_flags; 1924 } 1925 1926 /* Set the new_slave's queue_id to be zero. Queue ID mapping 1927 * is set via sysfs or module option if desired. 1928 */ 1929 new_slave->queue_id = 0; 1930 1931 /* Save slave's original mtu and then set it to match the bond */ 1932 new_slave->original_mtu = slave_dev->mtu; 1933 res = dev_set_mtu(slave_dev, bond->dev->mtu); 1934 if (res) { 1935 slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res); 1936 goto err_free; 1937 } 1938 1939 /* Save slave's original ("permanent") mac address for modes 1940 * that need it, and for restoring it upon release, and then 1941 * set it to the master's address 1942 */ 1943 bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr, 1944 slave_dev->addr_len); 1945 1946 if (!bond->params.fail_over_mac || 1947 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1948 /* Set slave to master's mac address. The application already 1949 * set the master's mac address to that of the first slave 1950 */ 1951 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 1952 ss.ss_family = slave_dev->type; 1953 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, 1954 extack); 1955 if (res) { 1956 slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res); 1957 goto err_restore_mtu; 1958 } 1959 } 1960 1961 /* set slave flag before open to prevent IPv6 addrconf */ 1962 slave_dev->flags |= IFF_SLAVE; 1963 1964 /* open the slave since the application closed it */ 1965 res = dev_open(slave_dev, extack); 1966 if (res) { 1967 slave_err(bond_dev, slave_dev, "Opening slave failed\n"); 1968 goto err_restore_mac; 1969 } 1970 1971 slave_dev->priv_flags |= IFF_BONDING; 1972 /* initialize slave stats */ 1973 dev_get_stats(new_slave->dev, &new_slave->slave_stats); 1974 1975 if (bond_is_lb(bond)) { 1976 /* bond_alb_init_slave() must be called before all other stages since 1977 * it might fail and we do not want to have to undo everything 1978 */ 1979 res = bond_alb_init_slave(bond, new_slave); 1980 if (res) 1981 goto err_close; 1982 } 1983 1984 res = vlan_vids_add_by_dev(slave_dev, bond_dev); 1985 if (res) { 1986 slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n"); 1987 goto err_close; 1988 } 1989 1990 prev_slave = bond_last_slave(bond); 1991 1992 new_slave->delay = 0; 1993 new_slave->link_failure_count = 0; 1994 1995 if (bond_update_speed_duplex(new_slave) && 1996 bond_needs_speed_duplex(bond)) 1997 new_slave->link = BOND_LINK_DOWN; 1998 1999 new_slave->last_rx = jiffies - 2000 (msecs_to_jiffies(bond->params.arp_interval) + 1); 2001 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) 2002 new_slave->target_last_arp_rx[i] = new_slave->last_rx; 2003 2004 new_slave->last_tx = new_slave->last_rx; 2005 2006 if (bond->params.miimon && !bond->params.use_carrier) { 2007 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 2008 2009 if ((link_reporting == -1) && !bond->params.arp_interval) { 2010 /* miimon is set but a bonded network driver 2011 * does not support ETHTOOL/MII and 2012 * arp_interval is not set. Note: if 2013 * use_carrier is enabled, we will never go 2014 * here (because netif_carrier is always 2015 * supported); thus, we don't need to change 2016 * the messages for netif_carrier. 2017 */ 2018 slave_warn(bond_dev, slave_dev, "MII and ETHTOOL support not available for slave, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n"); 2019 } else if (link_reporting == -1) { 2020 /* unable get link status using mii/ethtool */ 2021 slave_warn(bond_dev, slave_dev, "can't get link status from slave; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface\n"); 2022 } 2023 } 2024 2025 /* check for initial state */ 2026 new_slave->link = BOND_LINK_NOCHANGE; 2027 if (bond->params.miimon) { 2028 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { 2029 if (bond->params.updelay) { 2030 bond_set_slave_link_state(new_slave, 2031 BOND_LINK_BACK, 2032 BOND_SLAVE_NOTIFY_NOW); 2033 new_slave->delay = bond->params.updelay; 2034 } else { 2035 bond_set_slave_link_state(new_slave, 2036 BOND_LINK_UP, 2037 BOND_SLAVE_NOTIFY_NOW); 2038 } 2039 } else { 2040 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN, 2041 BOND_SLAVE_NOTIFY_NOW); 2042 } 2043 } else if (bond->params.arp_interval) { 2044 bond_set_slave_link_state(new_slave, 2045 (netif_carrier_ok(slave_dev) ? 2046 BOND_LINK_UP : BOND_LINK_DOWN), 2047 BOND_SLAVE_NOTIFY_NOW); 2048 } else { 2049 bond_set_slave_link_state(new_slave, BOND_LINK_UP, 2050 BOND_SLAVE_NOTIFY_NOW); 2051 } 2052 2053 if (new_slave->link != BOND_LINK_DOWN) 2054 new_slave->last_link_up = jiffies; 2055 slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n", 2056 new_slave->link == BOND_LINK_DOWN ? "DOWN" : 2057 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); 2058 2059 if (bond_uses_primary(bond) && bond->params.primary[0]) { 2060 /* if there is a primary slave, remember it */ 2061 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 2062 rcu_assign_pointer(bond->primary_slave, new_slave); 2063 bond->force_primary = true; 2064 } 2065 } 2066 2067 switch (BOND_MODE(bond)) { 2068 case BOND_MODE_ACTIVEBACKUP: 2069 bond_set_slave_inactive_flags(new_slave, 2070 BOND_SLAVE_NOTIFY_NOW); 2071 break; 2072 case BOND_MODE_8023AD: 2073 /* in 802.3ad mode, the internal mechanism 2074 * will activate the slaves in the selected 2075 * aggregator 2076 */ 2077 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 2078 /* if this is the first slave */ 2079 if (!prev_slave) { 2080 SLAVE_AD_INFO(new_slave)->id = 1; 2081 /* Initialize AD with the number of times that the AD timer is called in 1 second 2082 * can be called only after the mac address of the bond is set 2083 */ 2084 bond_3ad_initialize(bond); 2085 } else { 2086 SLAVE_AD_INFO(new_slave)->id = 2087 SLAVE_AD_INFO(prev_slave)->id + 1; 2088 } 2089 2090 bond_3ad_bind_slave(new_slave); 2091 break; 2092 case BOND_MODE_TLB: 2093 case BOND_MODE_ALB: 2094 bond_set_active_slave(new_slave); 2095 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 2096 break; 2097 default: 2098 slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n"); 2099 2100 /* always active in trunk mode */ 2101 bond_set_active_slave(new_slave); 2102 2103 /* In trunking mode there is little meaning to curr_active_slave 2104 * anyway (it holds no special properties of the bond device), 2105 * so we can change it without calling change_active_interface() 2106 */ 2107 if (!rcu_access_pointer(bond->curr_active_slave) && 2108 new_slave->link == BOND_LINK_UP) 2109 rcu_assign_pointer(bond->curr_active_slave, new_slave); 2110 2111 break; 2112 } /* switch(bond_mode) */ 2113 2114 #ifdef CONFIG_NET_POLL_CONTROLLER 2115 if (bond->dev->npinfo) { 2116 if (slave_enable_netpoll(new_slave)) { 2117 slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n"); 2118 res = -EBUSY; 2119 goto err_detach; 2120 } 2121 } 2122 #endif 2123 2124 if (!(bond_dev->features & NETIF_F_LRO)) 2125 dev_disable_lro(slave_dev); 2126 2127 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 2128 new_slave); 2129 if (res) { 2130 slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res); 2131 goto err_detach; 2132 } 2133 2134 res = bond_master_upper_dev_link(bond, new_slave, extack); 2135 if (res) { 2136 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res); 2137 goto err_unregister; 2138 } 2139 2140 bond_lower_state_changed(new_slave); 2141 2142 res = bond_sysfs_slave_add(new_slave); 2143 if (res) { 2144 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res); 2145 goto err_upper_unlink; 2146 } 2147 2148 /* If the mode uses primary, then the following is handled by 2149 * bond_change_active_slave(). 2150 */ 2151 if (!bond_uses_primary(bond)) { 2152 /* set promiscuity level to new slave */ 2153 if (bond_dev->flags & IFF_PROMISC) { 2154 res = dev_set_promiscuity(slave_dev, 1); 2155 if (res) 2156 goto err_sysfs_del; 2157 } 2158 2159 /* set allmulti level to new slave */ 2160 if (bond_dev->flags & IFF_ALLMULTI) { 2161 res = dev_set_allmulti(slave_dev, 1); 2162 if (res) { 2163 if (bond_dev->flags & IFF_PROMISC) 2164 dev_set_promiscuity(slave_dev, -1); 2165 goto err_sysfs_del; 2166 } 2167 } 2168 2169 netif_addr_lock_bh(bond_dev); 2170 dev_mc_sync_multiple(slave_dev, bond_dev); 2171 dev_uc_sync_multiple(slave_dev, bond_dev); 2172 netif_addr_unlock_bh(bond_dev); 2173 2174 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 2175 /* add lacpdu mc addr to mc list */ 2176 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 2177 2178 dev_mc_add(slave_dev, lacpdu_multicast); 2179 } 2180 } 2181 2182 bond->slave_cnt++; 2183 bond_compute_features(bond); 2184 bond_set_carrier(bond); 2185 2186 if (bond_uses_primary(bond)) { 2187 block_netpoll_tx(); 2188 bond_select_active_slave(bond); 2189 unblock_netpoll_tx(); 2190 } 2191 2192 if (bond_mode_can_use_xmit_hash(bond)) 2193 bond_update_slave_arr(bond, NULL); 2194 2195 2196 if (!slave_dev->netdev_ops->ndo_bpf || 2197 !slave_dev->netdev_ops->ndo_xdp_xmit) { 2198 if (bond->xdp_prog) { 2199 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 2200 "Slave does not support XDP"); 2201 res = -EOPNOTSUPP; 2202 goto err_sysfs_del; 2203 } 2204 } else if (bond->xdp_prog) { 2205 struct netdev_bpf xdp = { 2206 .command = XDP_SETUP_PROG, 2207 .flags = 0, 2208 .prog = bond->xdp_prog, 2209 .extack = extack, 2210 }; 2211 2212 if (dev_xdp_prog_count(slave_dev) > 0) { 2213 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 2214 "Slave has XDP program loaded, please unload before enslaving"); 2215 res = -EOPNOTSUPP; 2216 goto err_sysfs_del; 2217 } 2218 2219 res = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 2220 if (res < 0) { 2221 /* ndo_bpf() sets extack error message */ 2222 slave_dbg(bond_dev, slave_dev, "Error %d calling ndo_bpf\n", res); 2223 goto err_sysfs_del; 2224 } 2225 if (bond->xdp_prog) 2226 bpf_prog_inc(bond->xdp_prog); 2227 } 2228 2229 slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n", 2230 bond_is_active_slave(new_slave) ? "an active" : "a backup", 2231 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down"); 2232 2233 /* enslave is successful */ 2234 bond_queue_slave_event(new_slave); 2235 return 0; 2236 2237 /* Undo stages on error */ 2238 err_sysfs_del: 2239 bond_sysfs_slave_del(new_slave); 2240 2241 err_upper_unlink: 2242 bond_upper_dev_unlink(bond, new_slave); 2243 2244 err_unregister: 2245 netdev_rx_handler_unregister(slave_dev); 2246 2247 err_detach: 2248 vlan_vids_del_by_dev(slave_dev, bond_dev); 2249 if (rcu_access_pointer(bond->primary_slave) == new_slave) 2250 RCU_INIT_POINTER(bond->primary_slave, NULL); 2251 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) { 2252 block_netpoll_tx(); 2253 bond_change_active_slave(bond, NULL); 2254 bond_select_active_slave(bond); 2255 unblock_netpoll_tx(); 2256 } 2257 /* either primary_slave or curr_active_slave might've changed */ 2258 synchronize_rcu(); 2259 slave_disable_netpoll(new_slave); 2260 2261 err_close: 2262 if (!netif_is_bond_master(slave_dev)) 2263 slave_dev->priv_flags &= ~IFF_BONDING; 2264 dev_close(slave_dev); 2265 2266 err_restore_mac: 2267 slave_dev->flags &= ~IFF_SLAVE; 2268 if (!bond->params.fail_over_mac || 2269 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2270 /* XXX TODO - fom follow mode needs to change master's 2271 * MAC if this slave's MAC is in use by the bond, or at 2272 * least print a warning. 2273 */ 2274 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr, 2275 new_slave->dev->addr_len); 2276 ss.ss_family = slave_dev->type; 2277 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL); 2278 } 2279 2280 err_restore_mtu: 2281 dev_set_mtu(slave_dev, new_slave->original_mtu); 2282 2283 err_free: 2284 kobject_put(&new_slave->kobj); 2285 2286 err_undo_flags: 2287 /* Enslave of first slave has failed and we need to fix master's mac */ 2288 if (!bond_has_slaves(bond)) { 2289 if (ether_addr_equal_64bits(bond_dev->dev_addr, 2290 slave_dev->dev_addr)) 2291 eth_hw_addr_random(bond_dev); 2292 if (bond_dev->type != ARPHRD_ETHER) { 2293 dev_close(bond_dev); 2294 ether_setup(bond_dev); 2295 bond_dev->flags |= IFF_MASTER; 2296 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 2297 } 2298 } 2299 2300 return res; 2301 } 2302 2303 /* Try to release the slave device <slave> from the bond device <master> 2304 * It is legal to access curr_active_slave without a lock because all the function 2305 * is RTNL-locked. If "all" is true it means that the function is being called 2306 * while destroying a bond interface and all slaves are being released. 2307 * 2308 * The rules for slave state should be: 2309 * for Active/Backup: 2310 * Active stays on all backups go down 2311 * for Bonded connections: 2312 * The first up interface should be left on and all others downed. 2313 */ 2314 static int __bond_release_one(struct net_device *bond_dev, 2315 struct net_device *slave_dev, 2316 bool all, bool unregister) 2317 { 2318 struct bonding *bond = netdev_priv(bond_dev); 2319 struct slave *slave, *oldcurrent; 2320 struct sockaddr_storage ss; 2321 int old_flags = bond_dev->flags; 2322 netdev_features_t old_features = bond_dev->features; 2323 2324 /* slave is not a slave or master is not master of this slave */ 2325 if (!(slave_dev->flags & IFF_SLAVE) || 2326 !netdev_has_upper_dev(slave_dev, bond_dev)) { 2327 slave_dbg(bond_dev, slave_dev, "cannot release slave\n"); 2328 return -EINVAL; 2329 } 2330 2331 block_netpoll_tx(); 2332 2333 slave = bond_get_slave_by_dev(bond, slave_dev); 2334 if (!slave) { 2335 /* not a slave of this bond */ 2336 slave_info(bond_dev, slave_dev, "interface not enslaved\n"); 2337 unblock_netpoll_tx(); 2338 return -EINVAL; 2339 } 2340 2341 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW); 2342 2343 bond_sysfs_slave_del(slave); 2344 2345 /* recompute stats just before removing the slave */ 2346 bond_get_stats(bond->dev, &bond->bond_stats); 2347 2348 if (bond->xdp_prog) { 2349 struct netdev_bpf xdp = { 2350 .command = XDP_SETUP_PROG, 2351 .flags = 0, 2352 .prog = NULL, 2353 .extack = NULL, 2354 }; 2355 if (slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp)) 2356 slave_warn(bond_dev, slave_dev, "failed to unload XDP program\n"); 2357 } 2358 2359 /* unregister rx_handler early so bond_handle_frame wouldn't be called 2360 * for this slave anymore. 2361 */ 2362 netdev_rx_handler_unregister(slave_dev); 2363 2364 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2365 bond_3ad_unbind_slave(slave); 2366 2367 bond_upper_dev_unlink(bond, slave); 2368 2369 if (bond_mode_can_use_xmit_hash(bond)) 2370 bond_update_slave_arr(bond, slave); 2371 2372 slave_info(bond_dev, slave_dev, "Releasing %s interface\n", 2373 bond_is_active_slave(slave) ? "active" : "backup"); 2374 2375 oldcurrent = rcu_access_pointer(bond->curr_active_slave); 2376 2377 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2378 2379 if (!all && (!bond->params.fail_over_mac || 2380 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) { 2381 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) && 2382 bond_has_slaves(bond)) 2383 slave_warn(bond_dev, slave_dev, "the permanent HWaddr of slave - %pM - is still in use by bond - set the HWaddr of slave to a different address to avoid conflicts\n", 2384 slave->perm_hwaddr); 2385 } 2386 2387 if (rtnl_dereference(bond->primary_slave) == slave) 2388 RCU_INIT_POINTER(bond->primary_slave, NULL); 2389 2390 if (oldcurrent == slave) 2391 bond_change_active_slave(bond, NULL); 2392 2393 if (bond_is_lb(bond)) { 2394 /* Must be called only after the slave has been 2395 * detached from the list and the curr_active_slave 2396 * has been cleared (if our_slave == old_current), 2397 * but before a new active slave is selected. 2398 */ 2399 bond_alb_deinit_slave(bond, slave); 2400 } 2401 2402 if (all) { 2403 RCU_INIT_POINTER(bond->curr_active_slave, NULL); 2404 } else if (oldcurrent == slave) { 2405 /* Note that we hold RTNL over this sequence, so there 2406 * is no concern that another slave add/remove event 2407 * will interfere. 2408 */ 2409 bond_select_active_slave(bond); 2410 } 2411 2412 bond_set_carrier(bond); 2413 if (!bond_has_slaves(bond)) 2414 eth_hw_addr_random(bond_dev); 2415 2416 unblock_netpoll_tx(); 2417 synchronize_rcu(); 2418 bond->slave_cnt--; 2419 2420 if (!bond_has_slaves(bond)) { 2421 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 2422 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev); 2423 } 2424 2425 bond_compute_features(bond); 2426 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 2427 (old_features & NETIF_F_VLAN_CHALLENGED)) 2428 slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n"); 2429 2430 vlan_vids_del_by_dev(slave_dev, bond_dev); 2431 2432 /* If the mode uses primary, then this case was handled above by 2433 * bond_change_active_slave(..., NULL) 2434 */ 2435 if (!bond_uses_primary(bond)) { 2436 /* unset promiscuity level from slave 2437 * NOTE: The NETDEV_CHANGEADDR call above may change the value 2438 * of the IFF_PROMISC flag in the bond_dev, but we need the 2439 * value of that flag before that change, as that was the value 2440 * when this slave was attached, so we cache at the start of the 2441 * function and use it here. Same goes for ALLMULTI below 2442 */ 2443 if (old_flags & IFF_PROMISC) 2444 dev_set_promiscuity(slave_dev, -1); 2445 2446 /* unset allmulti level from slave */ 2447 if (old_flags & IFF_ALLMULTI) 2448 dev_set_allmulti(slave_dev, -1); 2449 2450 bond_hw_addr_flush(bond_dev, slave_dev); 2451 } 2452 2453 slave_disable_netpoll(slave); 2454 2455 /* close slave before restoring its mac address */ 2456 dev_close(slave_dev); 2457 2458 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE || 2459 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2460 /* restore original ("permanent") mac address */ 2461 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr, 2462 slave->dev->addr_len); 2463 ss.ss_family = slave_dev->type; 2464 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL); 2465 } 2466 2467 if (unregister) 2468 __dev_set_mtu(slave_dev, slave->original_mtu); 2469 else 2470 dev_set_mtu(slave_dev, slave->original_mtu); 2471 2472 if (!netif_is_bond_master(slave_dev)) 2473 slave_dev->priv_flags &= ~IFF_BONDING; 2474 2475 kobject_put(&slave->kobj); 2476 2477 return 0; 2478 } 2479 2480 /* A wrapper used because of ndo_del_link */ 2481 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 2482 { 2483 return __bond_release_one(bond_dev, slave_dev, false, false); 2484 } 2485 2486 /* First release a slave and then destroy the bond if no more slaves are left. 2487 * Must be under rtnl_lock when this function is called. 2488 */ 2489 static int bond_release_and_destroy(struct net_device *bond_dev, 2490 struct net_device *slave_dev) 2491 { 2492 struct bonding *bond = netdev_priv(bond_dev); 2493 int ret; 2494 2495 ret = __bond_release_one(bond_dev, slave_dev, false, true); 2496 if (ret == 0 && !bond_has_slaves(bond) && 2497 bond_dev->reg_state != NETREG_UNREGISTERING) { 2498 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 2499 netdev_info(bond_dev, "Destroying bond\n"); 2500 bond_remove_proc_entry(bond); 2501 unregister_netdevice(bond_dev); 2502 } 2503 return ret; 2504 } 2505 2506 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info) 2507 { 2508 struct bonding *bond = netdev_priv(bond_dev); 2509 2510 bond_fill_ifbond(bond, info); 2511 } 2512 2513 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 2514 { 2515 struct bonding *bond = netdev_priv(bond_dev); 2516 struct list_head *iter; 2517 int i = 0, res = -ENODEV; 2518 struct slave *slave; 2519 2520 bond_for_each_slave(bond, slave, iter) { 2521 if (i++ == (int)info->slave_id) { 2522 res = 0; 2523 bond_fill_ifslave(slave, info); 2524 break; 2525 } 2526 } 2527 2528 return res; 2529 } 2530 2531 /*-------------------------------- Monitoring -------------------------------*/ 2532 2533 /* called with rcu_read_lock() */ 2534 static int bond_miimon_inspect(struct bonding *bond) 2535 { 2536 int link_state, commit = 0; 2537 struct list_head *iter; 2538 struct slave *slave; 2539 bool ignore_updelay; 2540 2541 ignore_updelay = !rcu_dereference(bond->curr_active_slave); 2542 2543 bond_for_each_slave_rcu(bond, slave, iter) { 2544 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 2545 2546 link_state = bond_check_dev_link(bond, slave->dev, 0); 2547 2548 switch (slave->link) { 2549 case BOND_LINK_UP: 2550 if (link_state) 2551 continue; 2552 2553 bond_propose_link_state(slave, BOND_LINK_FAIL); 2554 commit++; 2555 slave->delay = bond->params.downdelay; 2556 if (slave->delay) { 2557 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n", 2558 (BOND_MODE(bond) == 2559 BOND_MODE_ACTIVEBACKUP) ? 2560 (bond_is_active_slave(slave) ? 2561 "active " : "backup ") : "", 2562 bond->params.downdelay * bond->params.miimon); 2563 } 2564 fallthrough; 2565 case BOND_LINK_FAIL: 2566 if (link_state) { 2567 /* recovered before downdelay expired */ 2568 bond_propose_link_state(slave, BOND_LINK_UP); 2569 slave->last_link_up = jiffies; 2570 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n", 2571 (bond->params.downdelay - slave->delay) * 2572 bond->params.miimon); 2573 commit++; 2574 continue; 2575 } 2576 2577 if (slave->delay <= 0) { 2578 bond_propose_link_state(slave, BOND_LINK_DOWN); 2579 commit++; 2580 continue; 2581 } 2582 2583 slave->delay--; 2584 break; 2585 2586 case BOND_LINK_DOWN: 2587 if (!link_state) 2588 continue; 2589 2590 bond_propose_link_state(slave, BOND_LINK_BACK); 2591 commit++; 2592 slave->delay = bond->params.updelay; 2593 2594 if (slave->delay) { 2595 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n", 2596 ignore_updelay ? 0 : 2597 bond->params.updelay * 2598 bond->params.miimon); 2599 } 2600 fallthrough; 2601 case BOND_LINK_BACK: 2602 if (!link_state) { 2603 bond_propose_link_state(slave, BOND_LINK_DOWN); 2604 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n", 2605 (bond->params.updelay - slave->delay) * 2606 bond->params.miimon); 2607 commit++; 2608 continue; 2609 } 2610 2611 if (ignore_updelay) 2612 slave->delay = 0; 2613 2614 if (slave->delay <= 0) { 2615 bond_propose_link_state(slave, BOND_LINK_UP); 2616 commit++; 2617 ignore_updelay = false; 2618 continue; 2619 } 2620 2621 slave->delay--; 2622 break; 2623 } 2624 } 2625 2626 return commit; 2627 } 2628 2629 static void bond_miimon_link_change(struct bonding *bond, 2630 struct slave *slave, 2631 char link) 2632 { 2633 switch (BOND_MODE(bond)) { 2634 case BOND_MODE_8023AD: 2635 bond_3ad_handle_link_change(slave, link); 2636 break; 2637 case BOND_MODE_TLB: 2638 case BOND_MODE_ALB: 2639 bond_alb_handle_link_change(bond, slave, link); 2640 break; 2641 case BOND_MODE_XOR: 2642 bond_update_slave_arr(bond, NULL); 2643 break; 2644 } 2645 } 2646 2647 static void bond_miimon_commit(struct bonding *bond) 2648 { 2649 struct list_head *iter; 2650 struct slave *slave, *primary; 2651 2652 bond_for_each_slave(bond, slave, iter) { 2653 switch (slave->link_new_state) { 2654 case BOND_LINK_NOCHANGE: 2655 /* For 802.3ad mode, check current slave speed and 2656 * duplex again in case its port was disabled after 2657 * invalid speed/duplex reporting but recovered before 2658 * link monitoring could make a decision on the actual 2659 * link status 2660 */ 2661 if (BOND_MODE(bond) == BOND_MODE_8023AD && 2662 slave->link == BOND_LINK_UP) 2663 bond_3ad_adapter_speed_duplex_changed(slave); 2664 continue; 2665 2666 case BOND_LINK_UP: 2667 if (bond_update_speed_duplex(slave) && 2668 bond_needs_speed_duplex(bond)) { 2669 slave->link = BOND_LINK_DOWN; 2670 if (net_ratelimit()) 2671 slave_warn(bond->dev, slave->dev, 2672 "failed to get link speed/duplex\n"); 2673 continue; 2674 } 2675 bond_set_slave_link_state(slave, BOND_LINK_UP, 2676 BOND_SLAVE_NOTIFY_NOW); 2677 slave->last_link_up = jiffies; 2678 2679 primary = rtnl_dereference(bond->primary_slave); 2680 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 2681 /* prevent it from being the active one */ 2682 bond_set_backup_slave(slave); 2683 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2684 /* make it immediately active */ 2685 bond_set_active_slave(slave); 2686 } 2687 2688 slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n", 2689 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed, 2690 slave->duplex ? "full" : "half"); 2691 2692 bond_miimon_link_change(bond, slave, BOND_LINK_UP); 2693 2694 if (!bond->curr_active_slave || slave == primary) 2695 goto do_failover; 2696 2697 continue; 2698 2699 case BOND_LINK_DOWN: 2700 if (slave->link_failure_count < UINT_MAX) 2701 slave->link_failure_count++; 2702 2703 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2704 BOND_SLAVE_NOTIFY_NOW); 2705 2706 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP || 2707 BOND_MODE(bond) == BOND_MODE_8023AD) 2708 bond_set_slave_inactive_flags(slave, 2709 BOND_SLAVE_NOTIFY_NOW); 2710 2711 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n"); 2712 2713 bond_miimon_link_change(bond, slave, BOND_LINK_DOWN); 2714 2715 if (slave == rcu_access_pointer(bond->curr_active_slave)) 2716 goto do_failover; 2717 2718 continue; 2719 2720 default: 2721 slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n", 2722 slave->link_new_state); 2723 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 2724 2725 continue; 2726 } 2727 2728 do_failover: 2729 block_netpoll_tx(); 2730 bond_select_active_slave(bond); 2731 unblock_netpoll_tx(); 2732 } 2733 2734 bond_set_carrier(bond); 2735 } 2736 2737 /* bond_mii_monitor 2738 * 2739 * Really a wrapper that splits the mii monitor into two phases: an 2740 * inspection, then (if inspection indicates something needs to be done) 2741 * an acquisition of appropriate locks followed by a commit phase to 2742 * implement whatever link state changes are indicated. 2743 */ 2744 static void bond_mii_monitor(struct work_struct *work) 2745 { 2746 struct bonding *bond = container_of(work, struct bonding, 2747 mii_work.work); 2748 bool should_notify_peers = false; 2749 bool commit; 2750 unsigned long delay; 2751 struct slave *slave; 2752 struct list_head *iter; 2753 2754 delay = msecs_to_jiffies(bond->params.miimon); 2755 2756 if (!bond_has_slaves(bond)) 2757 goto re_arm; 2758 2759 rcu_read_lock(); 2760 should_notify_peers = bond_should_notify_peers(bond); 2761 commit = !!bond_miimon_inspect(bond); 2762 if (bond->send_peer_notif) { 2763 rcu_read_unlock(); 2764 if (rtnl_trylock()) { 2765 bond->send_peer_notif--; 2766 rtnl_unlock(); 2767 } 2768 } else { 2769 rcu_read_unlock(); 2770 } 2771 2772 if (commit) { 2773 /* Race avoidance with bond_close cancel of workqueue */ 2774 if (!rtnl_trylock()) { 2775 delay = 1; 2776 should_notify_peers = false; 2777 goto re_arm; 2778 } 2779 2780 bond_for_each_slave(bond, slave, iter) { 2781 bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER); 2782 } 2783 bond_miimon_commit(bond); 2784 2785 rtnl_unlock(); /* might sleep, hold no other locks */ 2786 } 2787 2788 re_arm: 2789 if (bond->params.miimon) 2790 queue_delayed_work(bond->wq, &bond->mii_work, delay); 2791 2792 if (should_notify_peers) { 2793 if (!rtnl_trylock()) 2794 return; 2795 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); 2796 rtnl_unlock(); 2797 } 2798 } 2799 2800 static int bond_upper_dev_walk(struct net_device *upper, 2801 struct netdev_nested_priv *priv) 2802 { 2803 __be32 ip = *(__be32 *)priv->data; 2804 2805 return ip == bond_confirm_addr(upper, 0, ip); 2806 } 2807 2808 static bool bond_has_this_ip(struct bonding *bond, __be32 ip) 2809 { 2810 struct netdev_nested_priv priv = { 2811 .data = (void *)&ip, 2812 }; 2813 bool ret = false; 2814 2815 if (ip == bond_confirm_addr(bond->dev, 0, ip)) 2816 return true; 2817 2818 rcu_read_lock(); 2819 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &priv)) 2820 ret = true; 2821 rcu_read_unlock(); 2822 2823 return ret; 2824 } 2825 2826 static bool bond_handle_vlan(struct slave *slave, struct bond_vlan_tag *tags, 2827 struct sk_buff *skb) 2828 { 2829 struct net_device *bond_dev = slave->bond->dev; 2830 struct net_device *slave_dev = slave->dev; 2831 struct bond_vlan_tag *outer_tag = tags; 2832 2833 if (!tags || tags->vlan_proto == VLAN_N_VID) 2834 return true; 2835 2836 tags++; 2837 2838 /* Go through all the tags backwards and add them to the packet */ 2839 while (tags->vlan_proto != VLAN_N_VID) { 2840 if (!tags->vlan_id) { 2841 tags++; 2842 continue; 2843 } 2844 2845 slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n", 2846 ntohs(outer_tag->vlan_proto), tags->vlan_id); 2847 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto, 2848 tags->vlan_id); 2849 if (!skb) { 2850 net_err_ratelimited("failed to insert inner VLAN tag\n"); 2851 return false; 2852 } 2853 2854 tags++; 2855 } 2856 /* Set the outer tag */ 2857 if (outer_tag->vlan_id) { 2858 slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n", 2859 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id); 2860 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto, 2861 outer_tag->vlan_id); 2862 } 2863 2864 return true; 2865 } 2866 2867 /* We go to the (large) trouble of VLAN tagging ARP frames because 2868 * switches in VLAN mode (especially if ports are configured as 2869 * "native" to a VLAN) might not pass non-tagged frames. 2870 */ 2871 static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip, 2872 __be32 src_ip, struct bond_vlan_tag *tags) 2873 { 2874 struct net_device *bond_dev = slave->bond->dev; 2875 struct net_device *slave_dev = slave->dev; 2876 struct sk_buff *skb; 2877 2878 slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n", 2879 arp_op, &dest_ip, &src_ip); 2880 2881 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2882 NULL, slave_dev->dev_addr, NULL); 2883 2884 if (!skb) { 2885 net_err_ratelimited("ARP packet allocation failed\n"); 2886 return; 2887 } 2888 2889 if (bond_handle_vlan(slave, tags, skb)) { 2890 slave_update_last_tx(slave); 2891 arp_xmit(skb); 2892 } 2893 2894 return; 2895 } 2896 2897 /* Validate the device path between the @start_dev and the @end_dev. 2898 * The path is valid if the @end_dev is reachable through device 2899 * stacking. 2900 * When the path is validated, collect any vlan information in the 2901 * path. 2902 */ 2903 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev, 2904 struct net_device *end_dev, 2905 int level) 2906 { 2907 struct bond_vlan_tag *tags; 2908 struct net_device *upper; 2909 struct list_head *iter; 2910 2911 if (start_dev == end_dev) { 2912 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC); 2913 if (!tags) 2914 return ERR_PTR(-ENOMEM); 2915 tags[level].vlan_proto = VLAN_N_VID; 2916 return tags; 2917 } 2918 2919 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) { 2920 tags = bond_verify_device_path(upper, end_dev, level + 1); 2921 if (IS_ERR_OR_NULL(tags)) { 2922 if (IS_ERR(tags)) 2923 return tags; 2924 continue; 2925 } 2926 if (is_vlan_dev(upper)) { 2927 tags[level].vlan_proto = vlan_dev_vlan_proto(upper); 2928 tags[level].vlan_id = vlan_dev_vlan_id(upper); 2929 } 2930 2931 return tags; 2932 } 2933 2934 return NULL; 2935 } 2936 2937 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2938 { 2939 struct rtable *rt; 2940 struct bond_vlan_tag *tags; 2941 __be32 *targets = bond->params.arp_targets, addr; 2942 int i; 2943 2944 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) { 2945 slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n", 2946 __func__, &targets[i]); 2947 tags = NULL; 2948 2949 /* Find out through which dev should the packet go */ 2950 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 2951 RTO_ONLINK, 0); 2952 if (IS_ERR(rt)) { 2953 /* there's no route to target - try to send arp 2954 * probe to generate any traffic (arp_validate=0) 2955 */ 2956 if (bond->params.arp_validate) 2957 pr_warn_once("%s: no route to arp_ip_target %pI4 and arp_validate is set\n", 2958 bond->dev->name, 2959 &targets[i]); 2960 bond_arp_send(slave, ARPOP_REQUEST, targets[i], 2961 0, tags); 2962 continue; 2963 } 2964 2965 /* bond device itself */ 2966 if (rt->dst.dev == bond->dev) 2967 goto found; 2968 2969 rcu_read_lock(); 2970 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0); 2971 rcu_read_unlock(); 2972 2973 if (!IS_ERR_OR_NULL(tags)) 2974 goto found; 2975 2976 /* Not our device - skip */ 2977 slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n", 2978 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL"); 2979 2980 ip_rt_put(rt); 2981 continue; 2982 2983 found: 2984 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0); 2985 ip_rt_put(rt); 2986 bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags); 2987 kfree(tags); 2988 } 2989 } 2990 2991 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 2992 { 2993 int i; 2994 2995 if (!sip || !bond_has_this_ip(bond, tip)) { 2996 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n", 2997 __func__, &sip, &tip); 2998 return; 2999 } 3000 3001 i = bond_get_targets_ip(bond->params.arp_targets, sip); 3002 if (i == -1) { 3003 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n", 3004 __func__, &sip); 3005 return; 3006 } 3007 slave->last_rx = jiffies; 3008 slave->target_last_arp_rx[i] = jiffies; 3009 } 3010 3011 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, 3012 struct slave *slave) 3013 { 3014 struct arphdr *arp = (struct arphdr *)skb->data; 3015 struct slave *curr_active_slave, *curr_arp_slave; 3016 unsigned char *arp_ptr; 3017 __be32 sip, tip; 3018 unsigned int alen; 3019 3020 alen = arp_hdr_len(bond->dev); 3021 3022 if (alen > skb_headlen(skb)) { 3023 arp = kmalloc(alen, GFP_ATOMIC); 3024 if (!arp) 3025 goto out_unlock; 3026 if (skb_copy_bits(skb, 0, arp, alen) < 0) 3027 goto out_unlock; 3028 } 3029 3030 if (arp->ar_hln != bond->dev->addr_len || 3031 skb->pkt_type == PACKET_OTHERHOST || 3032 skb->pkt_type == PACKET_LOOPBACK || 3033 arp->ar_hrd != htons(ARPHRD_ETHER) || 3034 arp->ar_pro != htons(ETH_P_IP) || 3035 arp->ar_pln != 4) 3036 goto out_unlock; 3037 3038 arp_ptr = (unsigned char *)(arp + 1); 3039 arp_ptr += bond->dev->addr_len; 3040 memcpy(&sip, arp_ptr, 4); 3041 arp_ptr += 4 + bond->dev->addr_len; 3042 memcpy(&tip, arp_ptr, 4); 3043 3044 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n", 3045 __func__, slave->dev->name, bond_slave_state(slave), 3046 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 3047 &sip, &tip); 3048 3049 curr_active_slave = rcu_dereference(bond->curr_active_slave); 3050 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 3051 3052 /* We 'trust' the received ARP enough to validate it if: 3053 * 3054 * (a) the slave receiving the ARP is active (which includes the 3055 * current ARP slave, if any), or 3056 * 3057 * (b) the receiving slave isn't active, but there is a currently 3058 * active slave and it received valid arp reply(s) after it became 3059 * the currently active slave, or 3060 * 3061 * (c) there is an ARP slave that sent an ARP during the prior ARP 3062 * interval, and we receive an ARP reply on any slave. We accept 3063 * these because switch FDB update delays may deliver the ARP 3064 * reply to a slave other than the sender of the ARP request. 3065 * 3066 * Note: for (b), backup slaves are receiving the broadcast ARP 3067 * request, not a reply. This request passes from the sending 3068 * slave through the L2 switch(es) to the receiving slave. Since 3069 * this is checking the request, sip/tip are swapped for 3070 * validation. 3071 * 3072 * This is done to avoid endless looping when we can't reach the 3073 * arp_ip_target and fool ourselves with our own arp requests. 3074 */ 3075 if (bond_is_active_slave(slave)) 3076 bond_validate_arp(bond, slave, sip, tip); 3077 else if (curr_active_slave && 3078 time_after(slave_last_rx(bond, curr_active_slave), 3079 curr_active_slave->last_link_up)) 3080 bond_validate_arp(bond, slave, tip, sip); 3081 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) && 3082 bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1)) 3083 bond_validate_arp(bond, slave, sip, tip); 3084 3085 out_unlock: 3086 if (arp != (struct arphdr *)skb->data) 3087 kfree(arp); 3088 return RX_HANDLER_ANOTHER; 3089 } 3090 3091 #if IS_ENABLED(CONFIG_IPV6) 3092 static void bond_ns_send(struct slave *slave, const struct in6_addr *daddr, 3093 const struct in6_addr *saddr, struct bond_vlan_tag *tags) 3094 { 3095 struct net_device *bond_dev = slave->bond->dev; 3096 struct net_device *slave_dev = slave->dev; 3097 struct in6_addr mcaddr; 3098 struct sk_buff *skb; 3099 3100 slave_dbg(bond_dev, slave_dev, "NS on slave: dst %pI6c src %pI6c\n", 3101 daddr, saddr); 3102 3103 skb = ndisc_ns_create(slave_dev, daddr, saddr, 0); 3104 if (!skb) { 3105 net_err_ratelimited("NS packet allocation failed\n"); 3106 return; 3107 } 3108 3109 addrconf_addr_solict_mult(daddr, &mcaddr); 3110 if (bond_handle_vlan(slave, tags, skb)) { 3111 slave_update_last_tx(slave); 3112 ndisc_send_skb(skb, &mcaddr, saddr); 3113 } 3114 } 3115 3116 static void bond_ns_send_all(struct bonding *bond, struct slave *slave) 3117 { 3118 struct in6_addr *targets = bond->params.ns_targets; 3119 struct bond_vlan_tag *tags; 3120 struct dst_entry *dst; 3121 struct in6_addr saddr; 3122 struct flowi6 fl6; 3123 int i; 3124 3125 for (i = 0; i < BOND_MAX_NS_TARGETS && !ipv6_addr_any(&targets[i]); i++) { 3126 slave_dbg(bond->dev, slave->dev, "%s: target %pI6c\n", 3127 __func__, &targets[i]); 3128 tags = NULL; 3129 3130 /* Find out through which dev should the packet go */ 3131 memset(&fl6, 0, sizeof(struct flowi6)); 3132 fl6.daddr = targets[i]; 3133 fl6.flowi6_oif = bond->dev->ifindex; 3134 3135 dst = ip6_route_output(dev_net(bond->dev), NULL, &fl6); 3136 if (dst->error) { 3137 dst_release(dst); 3138 /* there's no route to target - try to send arp 3139 * probe to generate any traffic (arp_validate=0) 3140 */ 3141 if (bond->params.arp_validate) 3142 pr_warn_once("%s: no route to ns_ip6_target %pI6c and arp_validate is set\n", 3143 bond->dev->name, 3144 &targets[i]); 3145 bond_ns_send(slave, &targets[i], &in6addr_any, tags); 3146 continue; 3147 } 3148 3149 /* bond device itself */ 3150 if (dst->dev == bond->dev) 3151 goto found; 3152 3153 rcu_read_lock(); 3154 tags = bond_verify_device_path(bond->dev, dst->dev, 0); 3155 rcu_read_unlock(); 3156 3157 if (!IS_ERR_OR_NULL(tags)) 3158 goto found; 3159 3160 /* Not our device - skip */ 3161 slave_dbg(bond->dev, slave->dev, "no path to ns_ip6_target %pI6c via dst->dev %s\n", 3162 &targets[i], dst->dev ? dst->dev->name : "NULL"); 3163 3164 dst_release(dst); 3165 continue; 3166 3167 found: 3168 if (!ipv6_dev_get_saddr(dev_net(dst->dev), dst->dev, &targets[i], 0, &saddr)) 3169 bond_ns_send(slave, &targets[i], &saddr, tags); 3170 dst_release(dst); 3171 kfree(tags); 3172 } 3173 } 3174 3175 static int bond_confirm_addr6(struct net_device *dev, 3176 struct netdev_nested_priv *priv) 3177 { 3178 struct in6_addr *addr = (struct in6_addr *)priv->data; 3179 3180 return ipv6_chk_addr(dev_net(dev), addr, dev, 0); 3181 } 3182 3183 static bool bond_has_this_ip6(struct bonding *bond, struct in6_addr *addr) 3184 { 3185 struct netdev_nested_priv priv = { 3186 .data = addr, 3187 }; 3188 int ret = false; 3189 3190 if (bond_confirm_addr6(bond->dev, &priv)) 3191 return true; 3192 3193 rcu_read_lock(); 3194 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_confirm_addr6, &priv)) 3195 ret = true; 3196 rcu_read_unlock(); 3197 3198 return ret; 3199 } 3200 3201 static void bond_validate_ns(struct bonding *bond, struct slave *slave, 3202 struct in6_addr *saddr, struct in6_addr *daddr) 3203 { 3204 int i; 3205 3206 if (ipv6_addr_any(saddr) || !bond_has_this_ip6(bond, daddr)) { 3207 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c tip %pI6c not found\n", 3208 __func__, saddr, daddr); 3209 return; 3210 } 3211 3212 i = bond_get_targets_ip6(bond->params.ns_targets, saddr); 3213 if (i == -1) { 3214 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c not found in targets\n", 3215 __func__, saddr); 3216 return; 3217 } 3218 slave->last_rx = jiffies; 3219 slave->target_last_arp_rx[i] = jiffies; 3220 } 3221 3222 static int bond_na_rcv(const struct sk_buff *skb, struct bonding *bond, 3223 struct slave *slave) 3224 { 3225 struct slave *curr_active_slave, *curr_arp_slave; 3226 struct icmp6hdr *hdr = icmp6_hdr(skb); 3227 struct in6_addr *saddr, *daddr; 3228 3229 if (skb->pkt_type == PACKET_OTHERHOST || 3230 skb->pkt_type == PACKET_LOOPBACK || 3231 hdr->icmp6_type != NDISC_NEIGHBOUR_ADVERTISEMENT) 3232 goto out; 3233 3234 saddr = &ipv6_hdr(skb)->saddr; 3235 daddr = &ipv6_hdr(skb)->daddr; 3236 3237 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI6c tip %pI6c\n", 3238 __func__, slave->dev->name, bond_slave_state(slave), 3239 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 3240 saddr, daddr); 3241 3242 curr_active_slave = rcu_dereference(bond->curr_active_slave); 3243 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 3244 3245 /* We 'trust' the received ARP enough to validate it if: 3246 * see bond_arp_rcv(). 3247 */ 3248 if (bond_is_active_slave(slave)) 3249 bond_validate_ns(bond, slave, saddr, daddr); 3250 else if (curr_active_slave && 3251 time_after(slave_last_rx(bond, curr_active_slave), 3252 curr_active_slave->last_link_up)) 3253 bond_validate_ns(bond, slave, saddr, daddr); 3254 else if (curr_arp_slave && 3255 bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1)) 3256 bond_validate_ns(bond, slave, saddr, daddr); 3257 3258 out: 3259 return RX_HANDLER_ANOTHER; 3260 } 3261 #endif 3262 3263 int bond_rcv_validate(const struct sk_buff *skb, struct bonding *bond, 3264 struct slave *slave) 3265 { 3266 #if IS_ENABLED(CONFIG_IPV6) 3267 bool is_ipv6 = skb->protocol == __cpu_to_be16(ETH_P_IPV6); 3268 #endif 3269 bool is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP); 3270 3271 slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n", 3272 __func__, skb->dev->name); 3273 3274 /* Use arp validate logic for both ARP and NS */ 3275 if (!slave_do_arp_validate(bond, slave)) { 3276 if ((slave_do_arp_validate_only(bond) && is_arp) || 3277 #if IS_ENABLED(CONFIG_IPV6) 3278 (slave_do_arp_validate_only(bond) && is_ipv6) || 3279 #endif 3280 !slave_do_arp_validate_only(bond)) 3281 slave->last_rx = jiffies; 3282 return RX_HANDLER_ANOTHER; 3283 } else if (is_arp) { 3284 return bond_arp_rcv(skb, bond, slave); 3285 #if IS_ENABLED(CONFIG_IPV6) 3286 } else if (is_ipv6) { 3287 return bond_na_rcv(skb, bond, slave); 3288 #endif 3289 } else { 3290 return RX_HANDLER_ANOTHER; 3291 } 3292 } 3293 3294 static void bond_send_validate(struct bonding *bond, struct slave *slave) 3295 { 3296 bond_arp_send_all(bond, slave); 3297 #if IS_ENABLED(CONFIG_IPV6) 3298 bond_ns_send_all(bond, slave); 3299 #endif 3300 } 3301 3302 /* function to verify if we're in the arp_interval timeslice, returns true if 3303 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval + 3304 * arp_interval/2) . the arp_interval/2 is needed for really fast networks. 3305 */ 3306 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 3307 int mod) 3308 { 3309 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3310 3311 return time_in_range(jiffies, 3312 last_act - delta_in_ticks, 3313 last_act + mod * delta_in_ticks + delta_in_ticks/2); 3314 } 3315 3316 /* This function is called regularly to monitor each slave's link 3317 * ensuring that traffic is being sent and received when arp monitoring 3318 * is used in load-balancing mode. if the adapter has been dormant, then an 3319 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 3320 * arp monitoring in active backup mode. 3321 */ 3322 static void bond_loadbalance_arp_mon(struct bonding *bond) 3323 { 3324 struct slave *slave, *oldcurrent; 3325 struct list_head *iter; 3326 int do_failover = 0, slave_state_changed = 0; 3327 3328 if (!bond_has_slaves(bond)) 3329 goto re_arm; 3330 3331 rcu_read_lock(); 3332 3333 oldcurrent = rcu_dereference(bond->curr_active_slave); 3334 /* see if any of the previous devices are up now (i.e. they have 3335 * xmt and rcv traffic). the curr_active_slave does not come into 3336 * the picture unless it is null. also, slave->last_link_up is not 3337 * needed here because we send an arp on each slave and give a slave 3338 * as long as it needs to get the tx/rx within the delta. 3339 * TODO: what about up/down delay in arp mode? it wasn't here before 3340 * so it can wait 3341 */ 3342 bond_for_each_slave_rcu(bond, slave, iter) { 3343 unsigned long last_tx = slave_last_tx(slave); 3344 3345 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 3346 3347 if (slave->link != BOND_LINK_UP) { 3348 if (bond_time_in_interval(bond, last_tx, 1) && 3349 bond_time_in_interval(bond, slave->last_rx, 1)) { 3350 3351 bond_propose_link_state(slave, BOND_LINK_UP); 3352 slave_state_changed = 1; 3353 3354 /* primary_slave has no meaning in round-robin 3355 * mode. the window of a slave being up and 3356 * curr_active_slave being null after enslaving 3357 * is closed. 3358 */ 3359 if (!oldcurrent) { 3360 slave_info(bond->dev, slave->dev, "link status definitely up\n"); 3361 do_failover = 1; 3362 } else { 3363 slave_info(bond->dev, slave->dev, "interface is now up\n"); 3364 } 3365 } 3366 } else { 3367 /* slave->link == BOND_LINK_UP */ 3368 3369 /* not all switches will respond to an arp request 3370 * when the source ip is 0, so don't take the link down 3371 * if we don't know our ip yet 3372 */ 3373 if (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) || 3374 !bond_time_in_interval(bond, slave->last_rx, bond->params.missed_max)) { 3375 3376 bond_propose_link_state(slave, BOND_LINK_DOWN); 3377 slave_state_changed = 1; 3378 3379 if (slave->link_failure_count < UINT_MAX) 3380 slave->link_failure_count++; 3381 3382 slave_info(bond->dev, slave->dev, "interface is now down\n"); 3383 3384 if (slave == oldcurrent) 3385 do_failover = 1; 3386 } 3387 } 3388 3389 /* note: if switch is in round-robin mode, all links 3390 * must tx arp to ensure all links rx an arp - otherwise 3391 * links may oscillate or not come up at all; if switch is 3392 * in something like xor mode, there is nothing we can 3393 * do - all replies will be rx'ed on same link causing slaves 3394 * to be unstable during low/no traffic periods 3395 */ 3396 if (bond_slave_is_up(slave)) 3397 bond_send_validate(bond, slave); 3398 } 3399 3400 rcu_read_unlock(); 3401 3402 if (do_failover || slave_state_changed) { 3403 if (!rtnl_trylock()) 3404 goto re_arm; 3405 3406 bond_for_each_slave(bond, slave, iter) { 3407 if (slave->link_new_state != BOND_LINK_NOCHANGE) 3408 slave->link = slave->link_new_state; 3409 } 3410 3411 if (slave_state_changed) { 3412 bond_slave_state_change(bond); 3413 if (BOND_MODE(bond) == BOND_MODE_XOR) 3414 bond_update_slave_arr(bond, NULL); 3415 } 3416 if (do_failover) { 3417 block_netpoll_tx(); 3418 bond_select_active_slave(bond); 3419 unblock_netpoll_tx(); 3420 } 3421 rtnl_unlock(); 3422 } 3423 3424 re_arm: 3425 if (bond->params.arp_interval) 3426 queue_delayed_work(bond->wq, &bond->arp_work, 3427 msecs_to_jiffies(bond->params.arp_interval)); 3428 } 3429 3430 /* Called to inspect slaves for active-backup mode ARP monitor link state 3431 * changes. Sets proposed link state in slaves to specify what action 3432 * should take place for the slave. Returns 0 if no changes are found, >0 3433 * if changes to link states must be committed. 3434 * 3435 * Called with rcu_read_lock held. 3436 */ 3437 static int bond_ab_arp_inspect(struct bonding *bond) 3438 { 3439 unsigned long last_tx, last_rx; 3440 struct list_head *iter; 3441 struct slave *slave; 3442 int commit = 0; 3443 3444 bond_for_each_slave_rcu(bond, slave, iter) { 3445 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 3446 last_rx = slave_last_rx(bond, slave); 3447 3448 if (slave->link != BOND_LINK_UP) { 3449 if (bond_time_in_interval(bond, last_rx, 1)) { 3450 bond_propose_link_state(slave, BOND_LINK_UP); 3451 commit++; 3452 } else if (slave->link == BOND_LINK_BACK) { 3453 bond_propose_link_state(slave, BOND_LINK_FAIL); 3454 commit++; 3455 } 3456 continue; 3457 } 3458 3459 /* Give slaves 2*delta after being enslaved or made 3460 * active. This avoids bouncing, as the last receive 3461 * times need a full ARP monitor cycle to be updated. 3462 */ 3463 if (bond_time_in_interval(bond, slave->last_link_up, 2)) 3464 continue; 3465 3466 /* Backup slave is down if: 3467 * - No current_arp_slave AND 3468 * - more than (missed_max+1)*delta since last receive AND 3469 * - the bond has an IP address 3470 * 3471 * Note: a non-null current_arp_slave indicates 3472 * the curr_active_slave went down and we are 3473 * searching for a new one; under this condition 3474 * we only take the curr_active_slave down - this 3475 * gives each slave a chance to tx/rx traffic 3476 * before being taken out 3477 */ 3478 if (!bond_is_active_slave(slave) && 3479 !rcu_access_pointer(bond->current_arp_slave) && 3480 !bond_time_in_interval(bond, last_rx, bond->params.missed_max + 1)) { 3481 bond_propose_link_state(slave, BOND_LINK_DOWN); 3482 commit++; 3483 } 3484 3485 /* Active slave is down if: 3486 * - more than missed_max*delta since transmitting OR 3487 * - (more than missed_max*delta since receive AND 3488 * the bond has an IP address) 3489 */ 3490 last_tx = slave_last_tx(slave); 3491 if (bond_is_active_slave(slave) && 3492 (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) || 3493 !bond_time_in_interval(bond, last_rx, bond->params.missed_max))) { 3494 bond_propose_link_state(slave, BOND_LINK_DOWN); 3495 commit++; 3496 } 3497 } 3498 3499 return commit; 3500 } 3501 3502 /* Called to commit link state changes noted by inspection step of 3503 * active-backup mode ARP monitor. 3504 * 3505 * Called with RTNL hold. 3506 */ 3507 static void bond_ab_arp_commit(struct bonding *bond) 3508 { 3509 struct list_head *iter; 3510 unsigned long last_tx; 3511 struct slave *slave; 3512 3513 bond_for_each_slave(bond, slave, iter) { 3514 switch (slave->link_new_state) { 3515 case BOND_LINK_NOCHANGE: 3516 continue; 3517 3518 case BOND_LINK_UP: 3519 last_tx = slave_last_tx(slave); 3520 if (rtnl_dereference(bond->curr_active_slave) != slave || 3521 (!rtnl_dereference(bond->curr_active_slave) && 3522 bond_time_in_interval(bond, last_tx, 1))) { 3523 struct slave *current_arp_slave; 3524 3525 current_arp_slave = rtnl_dereference(bond->current_arp_slave); 3526 bond_set_slave_link_state(slave, BOND_LINK_UP, 3527 BOND_SLAVE_NOTIFY_NOW); 3528 if (current_arp_slave) { 3529 bond_set_slave_inactive_flags( 3530 current_arp_slave, 3531 BOND_SLAVE_NOTIFY_NOW); 3532 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3533 } 3534 3535 slave_info(bond->dev, slave->dev, "link status definitely up\n"); 3536 3537 if (!rtnl_dereference(bond->curr_active_slave) || 3538 slave == rtnl_dereference(bond->primary_slave)) 3539 goto do_failover; 3540 3541 } 3542 3543 continue; 3544 3545 case BOND_LINK_DOWN: 3546 if (slave->link_failure_count < UINT_MAX) 3547 slave->link_failure_count++; 3548 3549 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 3550 BOND_SLAVE_NOTIFY_NOW); 3551 bond_set_slave_inactive_flags(slave, 3552 BOND_SLAVE_NOTIFY_NOW); 3553 3554 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n"); 3555 3556 if (slave == rtnl_dereference(bond->curr_active_slave)) { 3557 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3558 goto do_failover; 3559 } 3560 3561 continue; 3562 3563 case BOND_LINK_FAIL: 3564 bond_set_slave_link_state(slave, BOND_LINK_FAIL, 3565 BOND_SLAVE_NOTIFY_NOW); 3566 bond_set_slave_inactive_flags(slave, 3567 BOND_SLAVE_NOTIFY_NOW); 3568 3569 /* A slave has just been enslaved and has become 3570 * the current active slave. 3571 */ 3572 if (rtnl_dereference(bond->curr_active_slave)) 3573 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3574 continue; 3575 3576 default: 3577 slave_err(bond->dev, slave->dev, 3578 "impossible: link_new_state %d on slave\n", 3579 slave->link_new_state); 3580 continue; 3581 } 3582 3583 do_failover: 3584 block_netpoll_tx(); 3585 bond_select_active_slave(bond); 3586 unblock_netpoll_tx(); 3587 } 3588 3589 bond_set_carrier(bond); 3590 } 3591 3592 /* Send ARP probes for active-backup mode ARP monitor. 3593 * 3594 * Called with rcu_read_lock held. 3595 */ 3596 static bool bond_ab_arp_probe(struct bonding *bond) 3597 { 3598 struct slave *slave, *before = NULL, *new_slave = NULL, 3599 *curr_arp_slave = rcu_dereference(bond->current_arp_slave), 3600 *curr_active_slave = rcu_dereference(bond->curr_active_slave); 3601 struct list_head *iter; 3602 bool found = false; 3603 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; 3604 3605 if (curr_arp_slave && curr_active_slave) 3606 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n", 3607 curr_arp_slave->dev->name, 3608 curr_active_slave->dev->name); 3609 3610 if (curr_active_slave) { 3611 bond_send_validate(bond, curr_active_slave); 3612 return should_notify_rtnl; 3613 } 3614 3615 /* if we don't have a curr_active_slave, search for the next available 3616 * backup slave from the current_arp_slave and make it the candidate 3617 * for becoming the curr_active_slave 3618 */ 3619 3620 if (!curr_arp_slave) { 3621 curr_arp_slave = bond_first_slave_rcu(bond); 3622 if (!curr_arp_slave) 3623 return should_notify_rtnl; 3624 } 3625 3626 bond_for_each_slave_rcu(bond, slave, iter) { 3627 if (!found && !before && bond_slave_is_up(slave)) 3628 before = slave; 3629 3630 if (found && !new_slave && bond_slave_is_up(slave)) 3631 new_slave = slave; 3632 /* if the link state is up at this point, we 3633 * mark it down - this can happen if we have 3634 * simultaneous link failures and 3635 * reselect_active_interface doesn't make this 3636 * one the current slave so it is still marked 3637 * up when it is actually down 3638 */ 3639 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 3640 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 3641 BOND_SLAVE_NOTIFY_LATER); 3642 if (slave->link_failure_count < UINT_MAX) 3643 slave->link_failure_count++; 3644 3645 bond_set_slave_inactive_flags(slave, 3646 BOND_SLAVE_NOTIFY_LATER); 3647 3648 slave_info(bond->dev, slave->dev, "backup interface is now down\n"); 3649 } 3650 if (slave == curr_arp_slave) 3651 found = true; 3652 } 3653 3654 if (!new_slave && before) 3655 new_slave = before; 3656 3657 if (!new_slave) 3658 goto check_state; 3659 3660 bond_set_slave_link_state(new_slave, BOND_LINK_BACK, 3661 BOND_SLAVE_NOTIFY_LATER); 3662 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER); 3663 bond_send_validate(bond, new_slave); 3664 new_slave->last_link_up = jiffies; 3665 rcu_assign_pointer(bond->current_arp_slave, new_slave); 3666 3667 check_state: 3668 bond_for_each_slave_rcu(bond, slave, iter) { 3669 if (slave->should_notify || slave->should_notify_link) { 3670 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; 3671 break; 3672 } 3673 } 3674 return should_notify_rtnl; 3675 } 3676 3677 static void bond_activebackup_arp_mon(struct bonding *bond) 3678 { 3679 bool should_notify_peers = false; 3680 bool should_notify_rtnl = false; 3681 int delta_in_ticks; 3682 3683 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3684 3685 if (!bond_has_slaves(bond)) 3686 goto re_arm; 3687 3688 rcu_read_lock(); 3689 3690 should_notify_peers = bond_should_notify_peers(bond); 3691 3692 if (bond_ab_arp_inspect(bond)) { 3693 rcu_read_unlock(); 3694 3695 /* Race avoidance with bond_close flush of workqueue */ 3696 if (!rtnl_trylock()) { 3697 delta_in_ticks = 1; 3698 should_notify_peers = false; 3699 goto re_arm; 3700 } 3701 3702 bond_ab_arp_commit(bond); 3703 3704 rtnl_unlock(); 3705 rcu_read_lock(); 3706 } 3707 3708 should_notify_rtnl = bond_ab_arp_probe(bond); 3709 rcu_read_unlock(); 3710 3711 re_arm: 3712 if (bond->params.arp_interval) 3713 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 3714 3715 if (should_notify_peers || should_notify_rtnl) { 3716 if (!rtnl_trylock()) 3717 return; 3718 3719 if (should_notify_peers) { 3720 bond->send_peer_notif--; 3721 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 3722 bond->dev); 3723 } 3724 if (should_notify_rtnl) { 3725 bond_slave_state_notify(bond); 3726 bond_slave_link_notify(bond); 3727 } 3728 3729 rtnl_unlock(); 3730 } 3731 } 3732 3733 static void bond_arp_monitor(struct work_struct *work) 3734 { 3735 struct bonding *bond = container_of(work, struct bonding, 3736 arp_work.work); 3737 3738 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3739 bond_activebackup_arp_mon(bond); 3740 else 3741 bond_loadbalance_arp_mon(bond); 3742 } 3743 3744 /*-------------------------- netdev event handling --------------------------*/ 3745 3746 /* Change device name */ 3747 static int bond_event_changename(struct bonding *bond) 3748 { 3749 bond_remove_proc_entry(bond); 3750 bond_create_proc_entry(bond); 3751 3752 bond_debug_reregister(bond); 3753 3754 return NOTIFY_DONE; 3755 } 3756 3757 static int bond_master_netdev_event(unsigned long event, 3758 struct net_device *bond_dev) 3759 { 3760 struct bonding *event_bond = netdev_priv(bond_dev); 3761 3762 netdev_dbg(bond_dev, "%s called\n", __func__); 3763 3764 switch (event) { 3765 case NETDEV_CHANGENAME: 3766 return bond_event_changename(event_bond); 3767 case NETDEV_UNREGISTER: 3768 bond_remove_proc_entry(event_bond); 3769 #ifdef CONFIG_XFRM_OFFLOAD 3770 xfrm_dev_state_flush(dev_net(bond_dev), bond_dev, true); 3771 #endif /* CONFIG_XFRM_OFFLOAD */ 3772 break; 3773 case NETDEV_REGISTER: 3774 bond_create_proc_entry(event_bond); 3775 break; 3776 default: 3777 break; 3778 } 3779 3780 return NOTIFY_DONE; 3781 } 3782 3783 static int bond_slave_netdev_event(unsigned long event, 3784 struct net_device *slave_dev) 3785 { 3786 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary; 3787 struct bonding *bond; 3788 struct net_device *bond_dev; 3789 3790 /* A netdev event can be generated while enslaving a device 3791 * before netdev_rx_handler_register is called in which case 3792 * slave will be NULL 3793 */ 3794 if (!slave) { 3795 netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__); 3796 return NOTIFY_DONE; 3797 } 3798 3799 bond_dev = slave->bond->dev; 3800 bond = slave->bond; 3801 primary = rtnl_dereference(bond->primary_slave); 3802 3803 slave_dbg(bond_dev, slave_dev, "%s called\n", __func__); 3804 3805 switch (event) { 3806 case NETDEV_UNREGISTER: 3807 if (bond_dev->type != ARPHRD_ETHER) 3808 bond_release_and_destroy(bond_dev, slave_dev); 3809 else 3810 __bond_release_one(bond_dev, slave_dev, false, true); 3811 break; 3812 case NETDEV_UP: 3813 case NETDEV_CHANGE: 3814 /* For 802.3ad mode only: 3815 * Getting invalid Speed/Duplex values here will put slave 3816 * in weird state. Mark it as link-fail if the link was 3817 * previously up or link-down if it hasn't yet come up, and 3818 * let link-monitoring (miimon) set it right when correct 3819 * speeds/duplex are available. 3820 */ 3821 if (bond_update_speed_duplex(slave) && 3822 BOND_MODE(bond) == BOND_MODE_8023AD) { 3823 if (slave->last_link_up) 3824 slave->link = BOND_LINK_FAIL; 3825 else 3826 slave->link = BOND_LINK_DOWN; 3827 } 3828 3829 if (BOND_MODE(bond) == BOND_MODE_8023AD) 3830 bond_3ad_adapter_speed_duplex_changed(slave); 3831 fallthrough; 3832 case NETDEV_DOWN: 3833 /* Refresh slave-array if applicable! 3834 * If the setup does not use miimon or arpmon (mode-specific!), 3835 * then these events will not cause the slave-array to be 3836 * refreshed. This will cause xmit to use a slave that is not 3837 * usable. Avoid such situation by refeshing the array at these 3838 * events. If these (miimon/arpmon) parameters are configured 3839 * then array gets refreshed twice and that should be fine! 3840 */ 3841 if (bond_mode_can_use_xmit_hash(bond)) 3842 bond_update_slave_arr(bond, NULL); 3843 break; 3844 case NETDEV_CHANGEMTU: 3845 /* TODO: Should slaves be allowed to 3846 * independently alter their MTU? For 3847 * an active-backup bond, slaves need 3848 * not be the same type of device, so 3849 * MTUs may vary. For other modes, 3850 * slaves arguably should have the 3851 * same MTUs. To do this, we'd need to 3852 * take over the slave's change_mtu 3853 * function for the duration of their 3854 * servitude. 3855 */ 3856 break; 3857 case NETDEV_CHANGENAME: 3858 /* we don't care if we don't have primary set */ 3859 if (!bond_uses_primary(bond) || 3860 !bond->params.primary[0]) 3861 break; 3862 3863 if (slave == primary) { 3864 /* slave's name changed - he's no longer primary */ 3865 RCU_INIT_POINTER(bond->primary_slave, NULL); 3866 } else if (!strcmp(slave_dev->name, bond->params.primary)) { 3867 /* we have a new primary slave */ 3868 rcu_assign_pointer(bond->primary_slave, slave); 3869 } else { /* we didn't change primary - exit */ 3870 break; 3871 } 3872 3873 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n", 3874 primary ? slave_dev->name : "none"); 3875 3876 block_netpoll_tx(); 3877 bond_select_active_slave(bond); 3878 unblock_netpoll_tx(); 3879 break; 3880 case NETDEV_FEAT_CHANGE: 3881 bond_compute_features(bond); 3882 break; 3883 case NETDEV_RESEND_IGMP: 3884 /* Propagate to master device */ 3885 call_netdevice_notifiers(event, slave->bond->dev); 3886 break; 3887 default: 3888 break; 3889 } 3890 3891 return NOTIFY_DONE; 3892 } 3893 3894 /* bond_netdev_event: handle netdev notifier chain events. 3895 * 3896 * This function receives events for the netdev chain. The caller (an 3897 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 3898 * locks for us to safely manipulate the slave devices (RTNL lock, 3899 * dev_probe_lock). 3900 */ 3901 static int bond_netdev_event(struct notifier_block *this, 3902 unsigned long event, void *ptr) 3903 { 3904 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 3905 3906 netdev_dbg(event_dev, "%s received %s\n", 3907 __func__, netdev_cmd_to_name(event)); 3908 3909 if (!(event_dev->priv_flags & IFF_BONDING)) 3910 return NOTIFY_DONE; 3911 3912 if (event_dev->flags & IFF_MASTER) { 3913 int ret; 3914 3915 ret = bond_master_netdev_event(event, event_dev); 3916 if (ret != NOTIFY_DONE) 3917 return ret; 3918 } 3919 3920 if (event_dev->flags & IFF_SLAVE) 3921 return bond_slave_netdev_event(event, event_dev); 3922 3923 return NOTIFY_DONE; 3924 } 3925 3926 static struct notifier_block bond_netdev_notifier = { 3927 .notifier_call = bond_netdev_event, 3928 }; 3929 3930 /*---------------------------- Hashing Policies -----------------------------*/ 3931 3932 /* Helper to access data in a packet, with or without a backing skb. 3933 * If skb is given the data is linearized if necessary via pskb_may_pull. 3934 */ 3935 static inline const void *bond_pull_data(struct sk_buff *skb, 3936 const void *data, int hlen, int n) 3937 { 3938 if (likely(n <= hlen)) 3939 return data; 3940 else if (skb && likely(pskb_may_pull(skb, n))) 3941 return skb->head; 3942 3943 return NULL; 3944 } 3945 3946 /* L2 hash helper */ 3947 static inline u32 bond_eth_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen) 3948 { 3949 struct ethhdr *ep; 3950 3951 data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr)); 3952 if (!data) 3953 return 0; 3954 3955 ep = (struct ethhdr *)(data + mhoff); 3956 return ep->h_dest[5] ^ ep->h_source[5] ^ be16_to_cpu(ep->h_proto); 3957 } 3958 3959 static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk, const void *data, 3960 int hlen, __be16 l2_proto, int *nhoff, int *ip_proto, bool l34) 3961 { 3962 const struct ipv6hdr *iph6; 3963 const struct iphdr *iph; 3964 3965 if (l2_proto == htons(ETH_P_IP)) { 3966 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph)); 3967 if (!data) 3968 return false; 3969 3970 iph = (const struct iphdr *)(data + *nhoff); 3971 iph_to_flow_copy_v4addrs(fk, iph); 3972 *nhoff += iph->ihl << 2; 3973 if (!ip_is_fragment(iph)) 3974 *ip_proto = iph->protocol; 3975 } else if (l2_proto == htons(ETH_P_IPV6)) { 3976 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph6)); 3977 if (!data) 3978 return false; 3979 3980 iph6 = (const struct ipv6hdr *)(data + *nhoff); 3981 iph_to_flow_copy_v6addrs(fk, iph6); 3982 *nhoff += sizeof(*iph6); 3983 *ip_proto = iph6->nexthdr; 3984 } else { 3985 return false; 3986 } 3987 3988 if (l34 && *ip_proto >= 0) 3989 fk->ports.ports = __skb_flow_get_ports(skb, *nhoff, *ip_proto, data, hlen); 3990 3991 return true; 3992 } 3993 3994 static u32 bond_vlan_srcmac_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen) 3995 { 3996 u32 srcmac_vendor = 0, srcmac_dev = 0; 3997 struct ethhdr *mac_hdr; 3998 u16 vlan = 0; 3999 int i; 4000 4001 data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr)); 4002 if (!data) 4003 return 0; 4004 mac_hdr = (struct ethhdr *)(data + mhoff); 4005 4006 for (i = 0; i < 3; i++) 4007 srcmac_vendor = (srcmac_vendor << 8) | mac_hdr->h_source[i]; 4008 4009 for (i = 3; i < ETH_ALEN; i++) 4010 srcmac_dev = (srcmac_dev << 8) | mac_hdr->h_source[i]; 4011 4012 if (skb && skb_vlan_tag_present(skb)) 4013 vlan = skb_vlan_tag_get(skb); 4014 4015 return vlan ^ srcmac_vendor ^ srcmac_dev; 4016 } 4017 4018 /* Extract the appropriate headers based on bond's xmit policy */ 4019 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, const void *data, 4020 __be16 l2_proto, int nhoff, int hlen, struct flow_keys *fk) 4021 { 4022 bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34; 4023 int ip_proto = -1; 4024 4025 switch (bond->params.xmit_policy) { 4026 case BOND_XMIT_POLICY_ENCAP23: 4027 case BOND_XMIT_POLICY_ENCAP34: 4028 memset(fk, 0, sizeof(*fk)); 4029 return __skb_flow_dissect(NULL, skb, &flow_keys_bonding, 4030 fk, data, l2_proto, nhoff, hlen, 0); 4031 default: 4032 break; 4033 } 4034 4035 fk->ports.ports = 0; 4036 memset(&fk->icmp, 0, sizeof(fk->icmp)); 4037 if (!bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34)) 4038 return false; 4039 4040 /* ICMP error packets contains at least 8 bytes of the header 4041 * of the packet which generated the error. Use this information 4042 * to correlate ICMP error packets within the same flow which 4043 * generated the error. 4044 */ 4045 if (ip_proto == IPPROTO_ICMP || ip_proto == IPPROTO_ICMPV6) { 4046 skb_flow_get_icmp_tci(skb, &fk->icmp, data, nhoff, hlen); 4047 if (ip_proto == IPPROTO_ICMP) { 4048 if (!icmp_is_err(fk->icmp.type)) 4049 return true; 4050 4051 nhoff += sizeof(struct icmphdr); 4052 } else if (ip_proto == IPPROTO_ICMPV6) { 4053 if (!icmpv6_is_err(fk->icmp.type)) 4054 return true; 4055 4056 nhoff += sizeof(struct icmp6hdr); 4057 } 4058 return bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34); 4059 } 4060 4061 return true; 4062 } 4063 4064 static u32 bond_ip_hash(u32 hash, struct flow_keys *flow, int xmit_policy) 4065 { 4066 hash ^= (__force u32)flow_get_u32_dst(flow) ^ 4067 (__force u32)flow_get_u32_src(flow); 4068 hash ^= (hash >> 16); 4069 hash ^= (hash >> 8); 4070 4071 /* discard lowest hash bit to deal with the common even ports pattern */ 4072 if (xmit_policy == BOND_XMIT_POLICY_LAYER34 || 4073 xmit_policy == BOND_XMIT_POLICY_ENCAP34) 4074 return hash >> 1; 4075 4076 return hash; 4077 } 4078 4079 /* Generate hash based on xmit policy. If @skb is given it is used to linearize 4080 * the data as required, but this function can be used without it if the data is 4081 * known to be linear (e.g. with xdp_buff). 4082 */ 4083 static u32 __bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, const void *data, 4084 __be16 l2_proto, int mhoff, int nhoff, int hlen) 4085 { 4086 struct flow_keys flow; 4087 u32 hash; 4088 4089 if (bond->params.xmit_policy == BOND_XMIT_POLICY_VLAN_SRCMAC) 4090 return bond_vlan_srcmac_hash(skb, data, mhoff, hlen); 4091 4092 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 || 4093 !bond_flow_dissect(bond, skb, data, l2_proto, nhoff, hlen, &flow)) 4094 return bond_eth_hash(skb, data, mhoff, hlen); 4095 4096 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 || 4097 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) { 4098 hash = bond_eth_hash(skb, data, mhoff, hlen); 4099 } else { 4100 if (flow.icmp.id) 4101 memcpy(&hash, &flow.icmp, sizeof(hash)); 4102 else 4103 memcpy(&hash, &flow.ports.ports, sizeof(hash)); 4104 } 4105 4106 return bond_ip_hash(hash, &flow, bond->params.xmit_policy); 4107 } 4108 4109 /** 4110 * bond_xmit_hash - generate a hash value based on the xmit policy 4111 * @bond: bonding device 4112 * @skb: buffer to use for headers 4113 * 4114 * This function will extract the necessary headers from the skb buffer and use 4115 * them to generate a hash based on the xmit_policy set in the bonding device 4116 */ 4117 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb) 4118 { 4119 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 && 4120 skb->l4_hash) 4121 return skb->hash; 4122 4123 return __bond_xmit_hash(bond, skb, skb->data, skb->protocol, 4124 skb_mac_offset(skb), skb_network_offset(skb), 4125 skb_headlen(skb)); 4126 } 4127 4128 /** 4129 * bond_xmit_hash_xdp - generate a hash value based on the xmit policy 4130 * @bond: bonding device 4131 * @xdp: buffer to use for headers 4132 * 4133 * The XDP variant of bond_xmit_hash. 4134 */ 4135 static u32 bond_xmit_hash_xdp(struct bonding *bond, struct xdp_buff *xdp) 4136 { 4137 struct ethhdr *eth; 4138 4139 if (xdp->data + sizeof(struct ethhdr) > xdp->data_end) 4140 return 0; 4141 4142 eth = (struct ethhdr *)xdp->data; 4143 4144 return __bond_xmit_hash(bond, NULL, xdp->data, eth->h_proto, 0, 4145 sizeof(struct ethhdr), xdp->data_end - xdp->data); 4146 } 4147 4148 /*-------------------------- Device entry points ----------------------------*/ 4149 4150 void bond_work_init_all(struct bonding *bond) 4151 { 4152 INIT_DELAYED_WORK(&bond->mcast_work, 4153 bond_resend_igmp_join_requests_delayed); 4154 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 4155 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 4156 INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor); 4157 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 4158 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler); 4159 } 4160 4161 static void bond_work_cancel_all(struct bonding *bond) 4162 { 4163 cancel_delayed_work_sync(&bond->mii_work); 4164 cancel_delayed_work_sync(&bond->arp_work); 4165 cancel_delayed_work_sync(&bond->alb_work); 4166 cancel_delayed_work_sync(&bond->ad_work); 4167 cancel_delayed_work_sync(&bond->mcast_work); 4168 cancel_delayed_work_sync(&bond->slave_arr_work); 4169 } 4170 4171 static int bond_open(struct net_device *bond_dev) 4172 { 4173 struct bonding *bond = netdev_priv(bond_dev); 4174 struct list_head *iter; 4175 struct slave *slave; 4176 4177 /* reset slave->backup and slave->inactive */ 4178 if (bond_has_slaves(bond)) { 4179 bond_for_each_slave(bond, slave, iter) { 4180 if (bond_uses_primary(bond) && 4181 slave != rcu_access_pointer(bond->curr_active_slave)) { 4182 bond_set_slave_inactive_flags(slave, 4183 BOND_SLAVE_NOTIFY_NOW); 4184 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) { 4185 bond_set_slave_active_flags(slave, 4186 BOND_SLAVE_NOTIFY_NOW); 4187 } 4188 } 4189 } 4190 4191 if (bond_is_lb(bond)) { 4192 /* bond_alb_initialize must be called before the timer 4193 * is started. 4194 */ 4195 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB))) 4196 return -ENOMEM; 4197 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB) 4198 queue_delayed_work(bond->wq, &bond->alb_work, 0); 4199 } 4200 4201 if (bond->params.miimon) /* link check interval, in milliseconds. */ 4202 queue_delayed_work(bond->wq, &bond->mii_work, 0); 4203 4204 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 4205 queue_delayed_work(bond->wq, &bond->arp_work, 0); 4206 bond->recv_probe = bond_rcv_validate; 4207 } 4208 4209 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 4210 queue_delayed_work(bond->wq, &bond->ad_work, 0); 4211 /* register to receive LACPDUs */ 4212 bond->recv_probe = bond_3ad_lacpdu_recv; 4213 bond_3ad_initiate_agg_selection(bond, 1); 4214 } 4215 4216 if (bond_mode_can_use_xmit_hash(bond)) 4217 bond_update_slave_arr(bond, NULL); 4218 4219 return 0; 4220 } 4221 4222 static int bond_close(struct net_device *bond_dev) 4223 { 4224 struct bonding *bond = netdev_priv(bond_dev); 4225 4226 bond_work_cancel_all(bond); 4227 bond->send_peer_notif = 0; 4228 if (bond_is_lb(bond)) 4229 bond_alb_deinitialize(bond); 4230 bond->recv_probe = NULL; 4231 4232 return 0; 4233 } 4234 4235 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but 4236 * that some drivers can provide 32bit values only. 4237 */ 4238 static void bond_fold_stats(struct rtnl_link_stats64 *_res, 4239 const struct rtnl_link_stats64 *_new, 4240 const struct rtnl_link_stats64 *_old) 4241 { 4242 const u64 *new = (const u64 *)_new; 4243 const u64 *old = (const u64 *)_old; 4244 u64 *res = (u64 *)_res; 4245 int i; 4246 4247 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) { 4248 u64 nv = new[i]; 4249 u64 ov = old[i]; 4250 s64 delta = nv - ov; 4251 4252 /* detects if this particular field is 32bit only */ 4253 if (((nv | ov) >> 32) == 0) 4254 delta = (s64)(s32)((u32)nv - (u32)ov); 4255 4256 /* filter anomalies, some drivers reset their stats 4257 * at down/up events. 4258 */ 4259 if (delta > 0) 4260 res[i] += delta; 4261 } 4262 } 4263 4264 #ifdef CONFIG_LOCKDEP 4265 static int bond_get_lowest_level_rcu(struct net_device *dev) 4266 { 4267 struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; 4268 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; 4269 int cur = 0, max = 0; 4270 4271 now = dev; 4272 iter = &dev->adj_list.lower; 4273 4274 while (1) { 4275 next = NULL; 4276 while (1) { 4277 ldev = netdev_next_lower_dev_rcu(now, &iter); 4278 if (!ldev) 4279 break; 4280 4281 next = ldev; 4282 niter = &ldev->adj_list.lower; 4283 dev_stack[cur] = now; 4284 iter_stack[cur++] = iter; 4285 if (max <= cur) 4286 max = cur; 4287 break; 4288 } 4289 4290 if (!next) { 4291 if (!cur) 4292 return max; 4293 next = dev_stack[--cur]; 4294 niter = iter_stack[cur]; 4295 } 4296 4297 now = next; 4298 iter = niter; 4299 } 4300 4301 return max; 4302 } 4303 #endif 4304 4305 static void bond_get_stats(struct net_device *bond_dev, 4306 struct rtnl_link_stats64 *stats) 4307 { 4308 struct bonding *bond = netdev_priv(bond_dev); 4309 struct rtnl_link_stats64 temp; 4310 struct list_head *iter; 4311 struct slave *slave; 4312 int nest_level = 0; 4313 4314 4315 rcu_read_lock(); 4316 #ifdef CONFIG_LOCKDEP 4317 nest_level = bond_get_lowest_level_rcu(bond_dev); 4318 #endif 4319 4320 spin_lock_nested(&bond->stats_lock, nest_level); 4321 memcpy(stats, &bond->bond_stats, sizeof(*stats)); 4322 4323 bond_for_each_slave_rcu(bond, slave, iter) { 4324 const struct rtnl_link_stats64 *new = 4325 dev_get_stats(slave->dev, &temp); 4326 4327 bond_fold_stats(stats, new, &slave->slave_stats); 4328 4329 /* save off the slave stats for the next run */ 4330 memcpy(&slave->slave_stats, new, sizeof(*new)); 4331 } 4332 4333 memcpy(&bond->bond_stats, stats, sizeof(*stats)); 4334 spin_unlock(&bond->stats_lock); 4335 rcu_read_unlock(); 4336 } 4337 4338 static int bond_eth_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 4339 { 4340 struct bonding *bond = netdev_priv(bond_dev); 4341 struct mii_ioctl_data *mii = NULL; 4342 const struct net_device_ops *ops; 4343 struct net_device *real_dev; 4344 struct hwtstamp_config cfg; 4345 struct ifreq ifrr; 4346 int res = 0; 4347 4348 netdev_dbg(bond_dev, "bond_eth_ioctl: cmd=%d\n", cmd); 4349 4350 switch (cmd) { 4351 case SIOCGMIIPHY: 4352 mii = if_mii(ifr); 4353 if (!mii) 4354 return -EINVAL; 4355 4356 mii->phy_id = 0; 4357 fallthrough; 4358 case SIOCGMIIREG: 4359 /* We do this again just in case we were called by SIOCGMIIREG 4360 * instead of SIOCGMIIPHY. 4361 */ 4362 mii = if_mii(ifr); 4363 if (!mii) 4364 return -EINVAL; 4365 4366 if (mii->reg_num == 1) { 4367 mii->val_out = 0; 4368 if (netif_carrier_ok(bond->dev)) 4369 mii->val_out = BMSR_LSTATUS; 4370 } 4371 4372 break; 4373 case SIOCSHWTSTAMP: 4374 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) 4375 return -EFAULT; 4376 4377 if (!(cfg.flags & HWTSTAMP_FLAG_BONDED_PHC_INDEX)) 4378 return -EOPNOTSUPP; 4379 4380 fallthrough; 4381 case SIOCGHWTSTAMP: 4382 real_dev = bond_option_active_slave_get_rcu(bond); 4383 if (!real_dev) 4384 return -EOPNOTSUPP; 4385 4386 strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ); 4387 ifrr.ifr_ifru = ifr->ifr_ifru; 4388 4389 ops = real_dev->netdev_ops; 4390 if (netif_device_present(real_dev) && ops->ndo_eth_ioctl) { 4391 res = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd); 4392 if (res) 4393 return res; 4394 4395 ifr->ifr_ifru = ifrr.ifr_ifru; 4396 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) 4397 return -EFAULT; 4398 4399 /* Set the BOND_PHC_INDEX flag to notify user space */ 4400 cfg.flags |= HWTSTAMP_FLAG_BONDED_PHC_INDEX; 4401 4402 return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? 4403 -EFAULT : 0; 4404 } 4405 fallthrough; 4406 default: 4407 res = -EOPNOTSUPP; 4408 } 4409 4410 return res; 4411 } 4412 4413 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 4414 { 4415 struct bonding *bond = netdev_priv(bond_dev); 4416 struct net_device *slave_dev = NULL; 4417 struct ifbond k_binfo; 4418 struct ifbond __user *u_binfo = NULL; 4419 struct ifslave k_sinfo; 4420 struct ifslave __user *u_sinfo = NULL; 4421 struct bond_opt_value newval; 4422 struct net *net; 4423 int res = 0; 4424 4425 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd); 4426 4427 switch (cmd) { 4428 case SIOCBONDINFOQUERY: 4429 u_binfo = (struct ifbond __user *)ifr->ifr_data; 4430 4431 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 4432 return -EFAULT; 4433 4434 bond_info_query(bond_dev, &k_binfo); 4435 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 4436 return -EFAULT; 4437 4438 return 0; 4439 case SIOCBONDSLAVEINFOQUERY: 4440 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 4441 4442 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 4443 return -EFAULT; 4444 4445 res = bond_slave_info_query(bond_dev, &k_sinfo); 4446 if (res == 0 && 4447 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 4448 return -EFAULT; 4449 4450 return res; 4451 default: 4452 break; 4453 } 4454 4455 net = dev_net(bond_dev); 4456 4457 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 4458 return -EPERM; 4459 4460 slave_dev = __dev_get_by_name(net, ifr->ifr_slave); 4461 4462 slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev); 4463 4464 if (!slave_dev) 4465 return -ENODEV; 4466 4467 switch (cmd) { 4468 case SIOCBONDENSLAVE: 4469 res = bond_enslave(bond_dev, slave_dev, NULL); 4470 break; 4471 case SIOCBONDRELEASE: 4472 res = bond_release(bond_dev, slave_dev); 4473 break; 4474 case SIOCBONDSETHWADDR: 4475 res = bond_set_dev_addr(bond_dev, slave_dev); 4476 break; 4477 case SIOCBONDCHANGEACTIVE: 4478 bond_opt_initstr(&newval, slave_dev->name); 4479 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE, 4480 &newval); 4481 break; 4482 default: 4483 res = -EOPNOTSUPP; 4484 } 4485 4486 return res; 4487 } 4488 4489 static int bond_siocdevprivate(struct net_device *bond_dev, struct ifreq *ifr, 4490 void __user *data, int cmd) 4491 { 4492 struct ifreq ifrdata = { .ifr_data = data }; 4493 4494 switch (cmd) { 4495 case BOND_INFO_QUERY_OLD: 4496 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDINFOQUERY); 4497 case BOND_SLAVE_INFO_QUERY_OLD: 4498 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDSLAVEINFOQUERY); 4499 case BOND_ENSLAVE_OLD: 4500 return bond_do_ioctl(bond_dev, ifr, SIOCBONDENSLAVE); 4501 case BOND_RELEASE_OLD: 4502 return bond_do_ioctl(bond_dev, ifr, SIOCBONDRELEASE); 4503 case BOND_SETHWADDR_OLD: 4504 return bond_do_ioctl(bond_dev, ifr, SIOCBONDSETHWADDR); 4505 case BOND_CHANGE_ACTIVE_OLD: 4506 return bond_do_ioctl(bond_dev, ifr, SIOCBONDCHANGEACTIVE); 4507 } 4508 4509 return -EOPNOTSUPP; 4510 } 4511 4512 static void bond_change_rx_flags(struct net_device *bond_dev, int change) 4513 { 4514 struct bonding *bond = netdev_priv(bond_dev); 4515 4516 if (change & IFF_PROMISC) 4517 bond_set_promiscuity(bond, 4518 bond_dev->flags & IFF_PROMISC ? 1 : -1); 4519 4520 if (change & IFF_ALLMULTI) 4521 bond_set_allmulti(bond, 4522 bond_dev->flags & IFF_ALLMULTI ? 1 : -1); 4523 } 4524 4525 static void bond_set_rx_mode(struct net_device *bond_dev) 4526 { 4527 struct bonding *bond = netdev_priv(bond_dev); 4528 struct list_head *iter; 4529 struct slave *slave; 4530 4531 rcu_read_lock(); 4532 if (bond_uses_primary(bond)) { 4533 slave = rcu_dereference(bond->curr_active_slave); 4534 if (slave) { 4535 dev_uc_sync(slave->dev, bond_dev); 4536 dev_mc_sync(slave->dev, bond_dev); 4537 } 4538 } else { 4539 bond_for_each_slave_rcu(bond, slave, iter) { 4540 dev_uc_sync_multiple(slave->dev, bond_dev); 4541 dev_mc_sync_multiple(slave->dev, bond_dev); 4542 } 4543 } 4544 rcu_read_unlock(); 4545 } 4546 4547 static int bond_neigh_init(struct neighbour *n) 4548 { 4549 struct bonding *bond = netdev_priv(n->dev); 4550 const struct net_device_ops *slave_ops; 4551 struct neigh_parms parms; 4552 struct slave *slave; 4553 int ret = 0; 4554 4555 rcu_read_lock(); 4556 slave = bond_first_slave_rcu(bond); 4557 if (!slave) 4558 goto out; 4559 slave_ops = slave->dev->netdev_ops; 4560 if (!slave_ops->ndo_neigh_setup) 4561 goto out; 4562 4563 /* TODO: find another way [1] to implement this. 4564 * Passing a zeroed structure is fragile, 4565 * but at least we do not pass garbage. 4566 * 4567 * [1] One way would be that ndo_neigh_setup() never touch 4568 * struct neigh_parms, but propagate the new neigh_setup() 4569 * back to ___neigh_create() / neigh_parms_alloc() 4570 */ 4571 memset(&parms, 0, sizeof(parms)); 4572 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); 4573 4574 if (ret) 4575 goto out; 4576 4577 if (parms.neigh_setup) 4578 ret = parms.neigh_setup(n); 4579 out: 4580 rcu_read_unlock(); 4581 return ret; 4582 } 4583 4584 /* The bonding ndo_neigh_setup is called at init time beofre any 4585 * slave exists. So we must declare proxy setup function which will 4586 * be used at run time to resolve the actual slave neigh param setup. 4587 * 4588 * It's also called by master devices (such as vlans) to setup their 4589 * underlying devices. In that case - do nothing, we're already set up from 4590 * our init. 4591 */ 4592 static int bond_neigh_setup(struct net_device *dev, 4593 struct neigh_parms *parms) 4594 { 4595 /* modify only our neigh_parms */ 4596 if (parms->dev == dev) 4597 parms->neigh_setup = bond_neigh_init; 4598 4599 return 0; 4600 } 4601 4602 /* Change the MTU of all of a master's slaves to match the master */ 4603 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 4604 { 4605 struct bonding *bond = netdev_priv(bond_dev); 4606 struct slave *slave, *rollback_slave; 4607 struct list_head *iter; 4608 int res = 0; 4609 4610 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu); 4611 4612 bond_for_each_slave(bond, slave, iter) { 4613 slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n", 4614 slave, slave->dev->netdev_ops->ndo_change_mtu); 4615 4616 res = dev_set_mtu(slave->dev, new_mtu); 4617 4618 if (res) { 4619 /* If we failed to set the slave's mtu to the new value 4620 * we must abort the operation even in ACTIVE_BACKUP 4621 * mode, because if we allow the backup slaves to have 4622 * different mtu values than the active slave we'll 4623 * need to change their mtu when doing a failover. That 4624 * means changing their mtu from timer context, which 4625 * is probably not a good idea. 4626 */ 4627 slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n", 4628 res, new_mtu); 4629 goto unwind; 4630 } 4631 } 4632 4633 bond_dev->mtu = new_mtu; 4634 4635 return 0; 4636 4637 unwind: 4638 /* unwind from head to the slave that failed */ 4639 bond_for_each_slave(bond, rollback_slave, iter) { 4640 int tmp_res; 4641 4642 if (rollback_slave == slave) 4643 break; 4644 4645 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu); 4646 if (tmp_res) 4647 slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n", 4648 tmp_res); 4649 } 4650 4651 return res; 4652 } 4653 4654 /* Change HW address 4655 * 4656 * Note that many devices must be down to change the HW address, and 4657 * downing the master releases all slaves. We can make bonds full of 4658 * bonding devices to test this, however. 4659 */ 4660 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 4661 { 4662 struct bonding *bond = netdev_priv(bond_dev); 4663 struct slave *slave, *rollback_slave; 4664 struct sockaddr_storage *ss = addr, tmp_ss; 4665 struct list_head *iter; 4666 int res = 0; 4667 4668 if (BOND_MODE(bond) == BOND_MODE_ALB) 4669 return bond_alb_set_mac_address(bond_dev, addr); 4670 4671 4672 netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond); 4673 4674 /* If fail_over_mac is enabled, do nothing and return success. 4675 * Returning an error causes ifenslave to fail. 4676 */ 4677 if (bond->params.fail_over_mac && 4678 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 4679 return 0; 4680 4681 if (!is_valid_ether_addr(ss->__data)) 4682 return -EADDRNOTAVAIL; 4683 4684 bond_for_each_slave(bond, slave, iter) { 4685 slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n", 4686 __func__, slave); 4687 res = dev_set_mac_address(slave->dev, addr, NULL); 4688 if (res) { 4689 /* TODO: consider downing the slave 4690 * and retry ? 4691 * User should expect communications 4692 * breakage anyway until ARP finish 4693 * updating, so... 4694 */ 4695 slave_dbg(bond_dev, slave->dev, "%s: err %d\n", 4696 __func__, res); 4697 goto unwind; 4698 } 4699 } 4700 4701 /* success */ 4702 dev_addr_set(bond_dev, ss->__data); 4703 return 0; 4704 4705 unwind: 4706 memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 4707 tmp_ss.ss_family = bond_dev->type; 4708 4709 /* unwind from head to the slave that failed */ 4710 bond_for_each_slave(bond, rollback_slave, iter) { 4711 int tmp_res; 4712 4713 if (rollback_slave == slave) 4714 break; 4715 4716 tmp_res = dev_set_mac_address(rollback_slave->dev, 4717 (struct sockaddr *)&tmp_ss, NULL); 4718 if (tmp_res) { 4719 slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n", 4720 __func__, tmp_res); 4721 } 4722 } 4723 4724 return res; 4725 } 4726 4727 /** 4728 * bond_get_slave_by_id - get xmit slave with slave_id 4729 * @bond: bonding device that is transmitting 4730 * @slave_id: slave id up to slave_cnt-1 through which to transmit 4731 * 4732 * This function tries to get slave with slave_id but in case 4733 * it fails, it tries to find the first available slave for transmission. 4734 */ 4735 static struct slave *bond_get_slave_by_id(struct bonding *bond, 4736 int slave_id) 4737 { 4738 struct list_head *iter; 4739 struct slave *slave; 4740 int i = slave_id; 4741 4742 /* Here we start from the slave with slave_id */ 4743 bond_for_each_slave_rcu(bond, slave, iter) { 4744 if (--i < 0) { 4745 if (bond_slave_can_tx(slave)) 4746 return slave; 4747 } 4748 } 4749 4750 /* Here we start from the first slave up to slave_id */ 4751 i = slave_id; 4752 bond_for_each_slave_rcu(bond, slave, iter) { 4753 if (--i < 0) 4754 break; 4755 if (bond_slave_can_tx(slave)) 4756 return slave; 4757 } 4758 /* no slave that can tx has been found */ 4759 return NULL; 4760 } 4761 4762 /** 4763 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave 4764 * @bond: bonding device to use 4765 * 4766 * Based on the value of the bonding device's packets_per_slave parameter 4767 * this function generates a slave id, which is usually used as the next 4768 * slave to transmit through. 4769 */ 4770 static u32 bond_rr_gen_slave_id(struct bonding *bond) 4771 { 4772 u32 slave_id; 4773 struct reciprocal_value reciprocal_packets_per_slave; 4774 int packets_per_slave = bond->params.packets_per_slave; 4775 4776 switch (packets_per_slave) { 4777 case 0: 4778 slave_id = prandom_u32(); 4779 break; 4780 case 1: 4781 slave_id = this_cpu_inc_return(*bond->rr_tx_counter); 4782 break; 4783 default: 4784 reciprocal_packets_per_slave = 4785 bond->params.reciprocal_packets_per_slave; 4786 slave_id = this_cpu_inc_return(*bond->rr_tx_counter); 4787 slave_id = reciprocal_divide(slave_id, 4788 reciprocal_packets_per_slave); 4789 break; 4790 } 4791 4792 return slave_id; 4793 } 4794 4795 static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond, 4796 struct sk_buff *skb) 4797 { 4798 struct slave *slave; 4799 int slave_cnt; 4800 u32 slave_id; 4801 4802 /* Start with the curr_active_slave that joined the bond as the 4803 * default for sending IGMP traffic. For failover purposes one 4804 * needs to maintain some consistency for the interface that will 4805 * send the join/membership reports. The curr_active_slave found 4806 * will send all of this type of traffic. 4807 */ 4808 if (skb->protocol == htons(ETH_P_IP)) { 4809 int noff = skb_network_offset(skb); 4810 struct iphdr *iph; 4811 4812 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph)))) 4813 goto non_igmp; 4814 4815 iph = ip_hdr(skb); 4816 if (iph->protocol == IPPROTO_IGMP) { 4817 slave = rcu_dereference(bond->curr_active_slave); 4818 if (slave) 4819 return slave; 4820 return bond_get_slave_by_id(bond, 0); 4821 } 4822 } 4823 4824 non_igmp: 4825 slave_cnt = READ_ONCE(bond->slave_cnt); 4826 if (likely(slave_cnt)) { 4827 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt; 4828 return bond_get_slave_by_id(bond, slave_id); 4829 } 4830 return NULL; 4831 } 4832 4833 static struct slave *bond_xdp_xmit_roundrobin_slave_get(struct bonding *bond, 4834 struct xdp_buff *xdp) 4835 { 4836 struct slave *slave; 4837 int slave_cnt; 4838 u32 slave_id; 4839 const struct ethhdr *eth; 4840 void *data = xdp->data; 4841 4842 if (data + sizeof(struct ethhdr) > xdp->data_end) 4843 goto non_igmp; 4844 4845 eth = (struct ethhdr *)data; 4846 data += sizeof(struct ethhdr); 4847 4848 /* See comment on IGMP in bond_xmit_roundrobin_slave_get() */ 4849 if (eth->h_proto == htons(ETH_P_IP)) { 4850 const struct iphdr *iph; 4851 4852 if (data + sizeof(struct iphdr) > xdp->data_end) 4853 goto non_igmp; 4854 4855 iph = (struct iphdr *)data; 4856 4857 if (iph->protocol == IPPROTO_IGMP) { 4858 slave = rcu_dereference(bond->curr_active_slave); 4859 if (slave) 4860 return slave; 4861 return bond_get_slave_by_id(bond, 0); 4862 } 4863 } 4864 4865 non_igmp: 4866 slave_cnt = READ_ONCE(bond->slave_cnt); 4867 if (likely(slave_cnt)) { 4868 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt; 4869 return bond_get_slave_by_id(bond, slave_id); 4870 } 4871 return NULL; 4872 } 4873 4874 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb, 4875 struct net_device *bond_dev) 4876 { 4877 struct bonding *bond = netdev_priv(bond_dev); 4878 struct slave *slave; 4879 4880 slave = bond_xmit_roundrobin_slave_get(bond, skb); 4881 if (likely(slave)) 4882 return bond_dev_queue_xmit(bond, skb, slave->dev); 4883 4884 return bond_tx_drop(bond_dev, skb); 4885 } 4886 4887 static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond) 4888 { 4889 return rcu_dereference(bond->curr_active_slave); 4890 } 4891 4892 /* In active-backup mode, we know that bond->curr_active_slave is always valid if 4893 * the bond has a usable interface. 4894 */ 4895 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb, 4896 struct net_device *bond_dev) 4897 { 4898 struct bonding *bond = netdev_priv(bond_dev); 4899 struct slave *slave; 4900 4901 slave = bond_xmit_activebackup_slave_get(bond); 4902 if (slave) 4903 return bond_dev_queue_xmit(bond, skb, slave->dev); 4904 4905 return bond_tx_drop(bond_dev, skb); 4906 } 4907 4908 /* Use this to update slave_array when (a) it's not appropriate to update 4909 * slave_array right away (note that update_slave_array() may sleep) 4910 * and / or (b) RTNL is not held. 4911 */ 4912 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay) 4913 { 4914 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay); 4915 } 4916 4917 /* Slave array work handler. Holds only RTNL */ 4918 static void bond_slave_arr_handler(struct work_struct *work) 4919 { 4920 struct bonding *bond = container_of(work, struct bonding, 4921 slave_arr_work.work); 4922 int ret; 4923 4924 if (!rtnl_trylock()) 4925 goto err; 4926 4927 ret = bond_update_slave_arr(bond, NULL); 4928 rtnl_unlock(); 4929 if (ret) { 4930 pr_warn_ratelimited("Failed to update slave array from WT\n"); 4931 goto err; 4932 } 4933 return; 4934 4935 err: 4936 bond_slave_arr_work_rearm(bond, 1); 4937 } 4938 4939 static void bond_skip_slave(struct bond_up_slave *slaves, 4940 struct slave *skipslave) 4941 { 4942 int idx; 4943 4944 /* Rare situation where caller has asked to skip a specific 4945 * slave but allocation failed (most likely!). BTW this is 4946 * only possible when the call is initiated from 4947 * __bond_release_one(). In this situation; overwrite the 4948 * skipslave entry in the array with the last entry from the 4949 * array to avoid a situation where the xmit path may choose 4950 * this to-be-skipped slave to send a packet out. 4951 */ 4952 for (idx = 0; slaves && idx < slaves->count; idx++) { 4953 if (skipslave == slaves->arr[idx]) { 4954 slaves->arr[idx] = 4955 slaves->arr[slaves->count - 1]; 4956 slaves->count--; 4957 break; 4958 } 4959 } 4960 } 4961 4962 static void bond_set_slave_arr(struct bonding *bond, 4963 struct bond_up_slave *usable_slaves, 4964 struct bond_up_slave *all_slaves) 4965 { 4966 struct bond_up_slave *usable, *all; 4967 4968 usable = rtnl_dereference(bond->usable_slaves); 4969 rcu_assign_pointer(bond->usable_slaves, usable_slaves); 4970 kfree_rcu(usable, rcu); 4971 4972 all = rtnl_dereference(bond->all_slaves); 4973 rcu_assign_pointer(bond->all_slaves, all_slaves); 4974 kfree_rcu(all, rcu); 4975 } 4976 4977 static void bond_reset_slave_arr(struct bonding *bond) 4978 { 4979 struct bond_up_slave *usable, *all; 4980 4981 usable = rtnl_dereference(bond->usable_slaves); 4982 if (usable) { 4983 RCU_INIT_POINTER(bond->usable_slaves, NULL); 4984 kfree_rcu(usable, rcu); 4985 } 4986 4987 all = rtnl_dereference(bond->all_slaves); 4988 if (all) { 4989 RCU_INIT_POINTER(bond->all_slaves, NULL); 4990 kfree_rcu(all, rcu); 4991 } 4992 } 4993 4994 /* Build the usable slaves array in control path for modes that use xmit-hash 4995 * to determine the slave interface - 4996 * (a) BOND_MODE_8023AD 4997 * (b) BOND_MODE_XOR 4998 * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0 4999 * 5000 * The caller is expected to hold RTNL only and NO other lock! 5001 */ 5002 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave) 5003 { 5004 struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL; 5005 struct slave *slave; 5006 struct list_head *iter; 5007 int agg_id = 0; 5008 int ret = 0; 5009 5010 might_sleep(); 5011 5012 usable_slaves = kzalloc(struct_size(usable_slaves, arr, 5013 bond->slave_cnt), GFP_KERNEL); 5014 all_slaves = kzalloc(struct_size(all_slaves, arr, 5015 bond->slave_cnt), GFP_KERNEL); 5016 if (!usable_slaves || !all_slaves) { 5017 ret = -ENOMEM; 5018 goto out; 5019 } 5020 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 5021 struct ad_info ad_info; 5022 5023 spin_lock_bh(&bond->mode_lock); 5024 if (bond_3ad_get_active_agg_info(bond, &ad_info)) { 5025 spin_unlock_bh(&bond->mode_lock); 5026 pr_debug("bond_3ad_get_active_agg_info failed\n"); 5027 /* No active aggragator means it's not safe to use 5028 * the previous array. 5029 */ 5030 bond_reset_slave_arr(bond); 5031 goto out; 5032 } 5033 spin_unlock_bh(&bond->mode_lock); 5034 agg_id = ad_info.aggregator_id; 5035 } 5036 bond_for_each_slave(bond, slave, iter) { 5037 if (skipslave == slave) 5038 continue; 5039 5040 all_slaves->arr[all_slaves->count++] = slave; 5041 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 5042 struct aggregator *agg; 5043 5044 agg = SLAVE_AD_INFO(slave)->port.aggregator; 5045 if (!agg || agg->aggregator_identifier != agg_id) 5046 continue; 5047 } 5048 if (!bond_slave_can_tx(slave)) 5049 continue; 5050 5051 slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n", 5052 usable_slaves->count); 5053 5054 usable_slaves->arr[usable_slaves->count++] = slave; 5055 } 5056 5057 bond_set_slave_arr(bond, usable_slaves, all_slaves); 5058 return ret; 5059 out: 5060 if (ret != 0 && skipslave) { 5061 bond_skip_slave(rtnl_dereference(bond->all_slaves), 5062 skipslave); 5063 bond_skip_slave(rtnl_dereference(bond->usable_slaves), 5064 skipslave); 5065 } 5066 kfree_rcu(all_slaves, rcu); 5067 kfree_rcu(usable_slaves, rcu); 5068 5069 return ret; 5070 } 5071 5072 static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond, 5073 struct sk_buff *skb, 5074 struct bond_up_slave *slaves) 5075 { 5076 struct slave *slave; 5077 unsigned int count; 5078 u32 hash; 5079 5080 hash = bond_xmit_hash(bond, skb); 5081 count = slaves ? READ_ONCE(slaves->count) : 0; 5082 if (unlikely(!count)) 5083 return NULL; 5084 5085 slave = slaves->arr[hash % count]; 5086 return slave; 5087 } 5088 5089 static struct slave *bond_xdp_xmit_3ad_xor_slave_get(struct bonding *bond, 5090 struct xdp_buff *xdp) 5091 { 5092 struct bond_up_slave *slaves; 5093 unsigned int count; 5094 u32 hash; 5095 5096 hash = bond_xmit_hash_xdp(bond, xdp); 5097 slaves = rcu_dereference(bond->usable_slaves); 5098 count = slaves ? READ_ONCE(slaves->count) : 0; 5099 if (unlikely(!count)) 5100 return NULL; 5101 5102 return slaves->arr[hash % count]; 5103 } 5104 5105 /* Use this Xmit function for 3AD as well as XOR modes. The current 5106 * usable slave array is formed in the control path. The xmit function 5107 * just calculates hash and sends the packet out. 5108 */ 5109 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb, 5110 struct net_device *dev) 5111 { 5112 struct bonding *bond = netdev_priv(dev); 5113 struct bond_up_slave *slaves; 5114 struct slave *slave; 5115 5116 slaves = rcu_dereference(bond->usable_slaves); 5117 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves); 5118 if (likely(slave)) 5119 return bond_dev_queue_xmit(bond, skb, slave->dev); 5120 5121 return bond_tx_drop(dev, skb); 5122 } 5123 5124 /* in broadcast mode, we send everything to all usable interfaces. */ 5125 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb, 5126 struct net_device *bond_dev) 5127 { 5128 struct bonding *bond = netdev_priv(bond_dev); 5129 struct slave *slave = NULL; 5130 struct list_head *iter; 5131 bool xmit_suc = false; 5132 bool skb_used = false; 5133 5134 bond_for_each_slave_rcu(bond, slave, iter) { 5135 struct sk_buff *skb2; 5136 5137 if (!(bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)) 5138 continue; 5139 5140 if (bond_is_last_slave(bond, slave)) { 5141 skb2 = skb; 5142 skb_used = true; 5143 } else { 5144 skb2 = skb_clone(skb, GFP_ATOMIC); 5145 if (!skb2) { 5146 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n", 5147 bond_dev->name, __func__); 5148 continue; 5149 } 5150 } 5151 5152 if (bond_dev_queue_xmit(bond, skb2, slave->dev) == NETDEV_TX_OK) 5153 xmit_suc = true; 5154 } 5155 5156 if (!skb_used) 5157 dev_kfree_skb_any(skb); 5158 5159 if (xmit_suc) 5160 return NETDEV_TX_OK; 5161 5162 dev_core_stats_tx_dropped_inc(bond_dev); 5163 return NET_XMIT_DROP; 5164 } 5165 5166 /*------------------------- Device initialization ---------------------------*/ 5167 5168 /* Lookup the slave that corresponds to a qid */ 5169 static inline int bond_slave_override(struct bonding *bond, 5170 struct sk_buff *skb) 5171 { 5172 struct slave *slave = NULL; 5173 struct list_head *iter; 5174 5175 if (!skb_rx_queue_recorded(skb)) 5176 return 1; 5177 5178 /* Find out if any slaves have the same mapping as this skb. */ 5179 bond_for_each_slave_rcu(bond, slave, iter) { 5180 if (slave->queue_id == skb_get_queue_mapping(skb)) { 5181 if (bond_slave_is_up(slave) && 5182 slave->link == BOND_LINK_UP) { 5183 bond_dev_queue_xmit(bond, skb, slave->dev); 5184 return 0; 5185 } 5186 /* If the slave isn't UP, use default transmit policy. */ 5187 break; 5188 } 5189 } 5190 5191 return 1; 5192 } 5193 5194 5195 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb, 5196 struct net_device *sb_dev) 5197 { 5198 /* This helper function exists to help dev_pick_tx get the correct 5199 * destination queue. Using a helper function skips a call to 5200 * skb_tx_hash and will put the skbs in the queue we expect on their 5201 * way down to the bonding driver. 5202 */ 5203 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 5204 5205 /* Save the original txq to restore before passing to the driver */ 5206 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb); 5207 5208 if (unlikely(txq >= dev->real_num_tx_queues)) { 5209 do { 5210 txq -= dev->real_num_tx_queues; 5211 } while (txq >= dev->real_num_tx_queues); 5212 } 5213 return txq; 5214 } 5215 5216 static struct net_device *bond_xmit_get_slave(struct net_device *master_dev, 5217 struct sk_buff *skb, 5218 bool all_slaves) 5219 { 5220 struct bonding *bond = netdev_priv(master_dev); 5221 struct bond_up_slave *slaves; 5222 struct slave *slave = NULL; 5223 5224 switch (BOND_MODE(bond)) { 5225 case BOND_MODE_ROUNDROBIN: 5226 slave = bond_xmit_roundrobin_slave_get(bond, skb); 5227 break; 5228 case BOND_MODE_ACTIVEBACKUP: 5229 slave = bond_xmit_activebackup_slave_get(bond); 5230 break; 5231 case BOND_MODE_8023AD: 5232 case BOND_MODE_XOR: 5233 if (all_slaves) 5234 slaves = rcu_dereference(bond->all_slaves); 5235 else 5236 slaves = rcu_dereference(bond->usable_slaves); 5237 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves); 5238 break; 5239 case BOND_MODE_BROADCAST: 5240 break; 5241 case BOND_MODE_ALB: 5242 slave = bond_xmit_alb_slave_get(bond, skb); 5243 break; 5244 case BOND_MODE_TLB: 5245 slave = bond_xmit_tlb_slave_get(bond, skb); 5246 break; 5247 default: 5248 /* Should never happen, mode already checked */ 5249 WARN_ONCE(true, "Unknown bonding mode"); 5250 break; 5251 } 5252 5253 if (slave) 5254 return slave->dev; 5255 return NULL; 5256 } 5257 5258 static void bond_sk_to_flow(struct sock *sk, struct flow_keys *flow) 5259 { 5260 switch (sk->sk_family) { 5261 #if IS_ENABLED(CONFIG_IPV6) 5262 case AF_INET6: 5263 if (ipv6_only_sock(sk) || 5264 ipv6_addr_type(&sk->sk_v6_daddr) != IPV6_ADDR_MAPPED) { 5265 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; 5266 flow->addrs.v6addrs.src = inet6_sk(sk)->saddr; 5267 flow->addrs.v6addrs.dst = sk->sk_v6_daddr; 5268 break; 5269 } 5270 fallthrough; 5271 #endif 5272 default: /* AF_INET */ 5273 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; 5274 flow->addrs.v4addrs.src = inet_sk(sk)->inet_rcv_saddr; 5275 flow->addrs.v4addrs.dst = inet_sk(sk)->inet_daddr; 5276 break; 5277 } 5278 5279 flow->ports.src = inet_sk(sk)->inet_sport; 5280 flow->ports.dst = inet_sk(sk)->inet_dport; 5281 } 5282 5283 /** 5284 * bond_sk_hash_l34 - generate a hash value based on the socket's L3 and L4 fields 5285 * @sk: socket to use for headers 5286 * 5287 * This function will extract the necessary field from the socket and use 5288 * them to generate a hash based on the LAYER34 xmit_policy. 5289 * Assumes that sk is a TCP or UDP socket. 5290 */ 5291 static u32 bond_sk_hash_l34(struct sock *sk) 5292 { 5293 struct flow_keys flow; 5294 u32 hash; 5295 5296 bond_sk_to_flow(sk, &flow); 5297 5298 /* L4 */ 5299 memcpy(&hash, &flow.ports.ports, sizeof(hash)); 5300 /* L3 */ 5301 return bond_ip_hash(hash, &flow, BOND_XMIT_POLICY_LAYER34); 5302 } 5303 5304 static struct net_device *__bond_sk_get_lower_dev(struct bonding *bond, 5305 struct sock *sk) 5306 { 5307 struct bond_up_slave *slaves; 5308 struct slave *slave; 5309 unsigned int count; 5310 u32 hash; 5311 5312 slaves = rcu_dereference(bond->usable_slaves); 5313 count = slaves ? READ_ONCE(slaves->count) : 0; 5314 if (unlikely(!count)) 5315 return NULL; 5316 5317 hash = bond_sk_hash_l34(sk); 5318 slave = slaves->arr[hash % count]; 5319 5320 return slave->dev; 5321 } 5322 5323 static struct net_device *bond_sk_get_lower_dev(struct net_device *dev, 5324 struct sock *sk) 5325 { 5326 struct bonding *bond = netdev_priv(dev); 5327 struct net_device *lower = NULL; 5328 5329 rcu_read_lock(); 5330 if (bond_sk_check(bond)) 5331 lower = __bond_sk_get_lower_dev(bond, sk); 5332 rcu_read_unlock(); 5333 5334 return lower; 5335 } 5336 5337 #if IS_ENABLED(CONFIG_TLS_DEVICE) 5338 static netdev_tx_t bond_tls_device_xmit(struct bonding *bond, struct sk_buff *skb, 5339 struct net_device *dev) 5340 { 5341 struct net_device *tls_netdev = rcu_dereference(tls_get_ctx(skb->sk)->netdev); 5342 5343 /* tls_netdev might become NULL, even if tls_is_sk_tx_device_offloaded 5344 * was true, if tls_device_down is running in parallel, but it's OK, 5345 * because bond_get_slave_by_dev has a NULL check. 5346 */ 5347 if (likely(bond_get_slave_by_dev(bond, tls_netdev))) 5348 return bond_dev_queue_xmit(bond, skb, tls_netdev); 5349 return bond_tx_drop(dev, skb); 5350 } 5351 #endif 5352 5353 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 5354 { 5355 struct bonding *bond = netdev_priv(dev); 5356 5357 if (bond_should_override_tx_queue(bond) && 5358 !bond_slave_override(bond, skb)) 5359 return NETDEV_TX_OK; 5360 5361 #if IS_ENABLED(CONFIG_TLS_DEVICE) 5362 if (skb->sk && tls_is_sk_tx_device_offloaded(skb->sk)) 5363 return bond_tls_device_xmit(bond, skb, dev); 5364 #endif 5365 5366 switch (BOND_MODE(bond)) { 5367 case BOND_MODE_ROUNDROBIN: 5368 return bond_xmit_roundrobin(skb, dev); 5369 case BOND_MODE_ACTIVEBACKUP: 5370 return bond_xmit_activebackup(skb, dev); 5371 case BOND_MODE_8023AD: 5372 case BOND_MODE_XOR: 5373 return bond_3ad_xor_xmit(skb, dev); 5374 case BOND_MODE_BROADCAST: 5375 return bond_xmit_broadcast(skb, dev); 5376 case BOND_MODE_ALB: 5377 return bond_alb_xmit(skb, dev); 5378 case BOND_MODE_TLB: 5379 return bond_tlb_xmit(skb, dev); 5380 default: 5381 /* Should never happen, mode already checked */ 5382 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond)); 5383 WARN_ON_ONCE(1); 5384 return bond_tx_drop(dev, skb); 5385 } 5386 } 5387 5388 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 5389 { 5390 struct bonding *bond = netdev_priv(dev); 5391 netdev_tx_t ret = NETDEV_TX_OK; 5392 5393 /* If we risk deadlock from transmitting this in the 5394 * netpoll path, tell netpoll to queue the frame for later tx 5395 */ 5396 if (unlikely(is_netpoll_tx_blocked(dev))) 5397 return NETDEV_TX_BUSY; 5398 5399 rcu_read_lock(); 5400 if (bond_has_slaves(bond)) 5401 ret = __bond_start_xmit(skb, dev); 5402 else 5403 ret = bond_tx_drop(dev, skb); 5404 rcu_read_unlock(); 5405 5406 return ret; 5407 } 5408 5409 static struct net_device * 5410 bond_xdp_get_xmit_slave(struct net_device *bond_dev, struct xdp_buff *xdp) 5411 { 5412 struct bonding *bond = netdev_priv(bond_dev); 5413 struct slave *slave; 5414 5415 /* Caller needs to hold rcu_read_lock() */ 5416 5417 switch (BOND_MODE(bond)) { 5418 case BOND_MODE_ROUNDROBIN: 5419 slave = bond_xdp_xmit_roundrobin_slave_get(bond, xdp); 5420 break; 5421 5422 case BOND_MODE_ACTIVEBACKUP: 5423 slave = bond_xmit_activebackup_slave_get(bond); 5424 break; 5425 5426 case BOND_MODE_8023AD: 5427 case BOND_MODE_XOR: 5428 slave = bond_xdp_xmit_3ad_xor_slave_get(bond, xdp); 5429 break; 5430 5431 default: 5432 /* Should never happen. Mode guarded by bond_xdp_check() */ 5433 netdev_err(bond_dev, "Unknown bonding mode %d for xdp xmit\n", BOND_MODE(bond)); 5434 WARN_ON_ONCE(1); 5435 return NULL; 5436 } 5437 5438 if (slave) 5439 return slave->dev; 5440 5441 return NULL; 5442 } 5443 5444 static int bond_xdp_xmit(struct net_device *bond_dev, 5445 int n, struct xdp_frame **frames, u32 flags) 5446 { 5447 int nxmit, err = -ENXIO; 5448 5449 rcu_read_lock(); 5450 5451 for (nxmit = 0; nxmit < n; nxmit++) { 5452 struct xdp_frame *frame = frames[nxmit]; 5453 struct xdp_frame *frames1[] = {frame}; 5454 struct net_device *slave_dev; 5455 struct xdp_buff xdp; 5456 5457 xdp_convert_frame_to_buff(frame, &xdp); 5458 5459 slave_dev = bond_xdp_get_xmit_slave(bond_dev, &xdp); 5460 if (!slave_dev) { 5461 err = -ENXIO; 5462 break; 5463 } 5464 5465 err = slave_dev->netdev_ops->ndo_xdp_xmit(slave_dev, 1, frames1, flags); 5466 if (err < 1) 5467 break; 5468 } 5469 5470 rcu_read_unlock(); 5471 5472 /* If error happened on the first frame then we can pass the error up, otherwise 5473 * report the number of frames that were xmitted. 5474 */ 5475 if (err < 0) 5476 return (nxmit == 0 ? err : nxmit); 5477 5478 return nxmit; 5479 } 5480 5481 static int bond_xdp_set(struct net_device *dev, struct bpf_prog *prog, 5482 struct netlink_ext_ack *extack) 5483 { 5484 struct bonding *bond = netdev_priv(dev); 5485 struct list_head *iter; 5486 struct slave *slave, *rollback_slave; 5487 struct bpf_prog *old_prog; 5488 struct netdev_bpf xdp = { 5489 .command = XDP_SETUP_PROG, 5490 .flags = 0, 5491 .prog = prog, 5492 .extack = extack, 5493 }; 5494 int err; 5495 5496 ASSERT_RTNL(); 5497 5498 if (!bond_xdp_check(bond)) 5499 return -EOPNOTSUPP; 5500 5501 old_prog = bond->xdp_prog; 5502 bond->xdp_prog = prog; 5503 5504 bond_for_each_slave(bond, slave, iter) { 5505 struct net_device *slave_dev = slave->dev; 5506 5507 if (!slave_dev->netdev_ops->ndo_bpf || 5508 !slave_dev->netdev_ops->ndo_xdp_xmit) { 5509 SLAVE_NL_ERR(dev, slave_dev, extack, 5510 "Slave device does not support XDP"); 5511 err = -EOPNOTSUPP; 5512 goto err; 5513 } 5514 5515 if (dev_xdp_prog_count(slave_dev) > 0) { 5516 SLAVE_NL_ERR(dev, slave_dev, extack, 5517 "Slave has XDP program loaded, please unload before enslaving"); 5518 err = -EOPNOTSUPP; 5519 goto err; 5520 } 5521 5522 err = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 5523 if (err < 0) { 5524 /* ndo_bpf() sets extack error message */ 5525 slave_err(dev, slave_dev, "Error %d calling ndo_bpf\n", err); 5526 goto err; 5527 } 5528 if (prog) 5529 bpf_prog_inc(prog); 5530 } 5531 5532 if (prog) { 5533 static_branch_inc(&bpf_master_redirect_enabled_key); 5534 } else if (old_prog) { 5535 bpf_prog_put(old_prog); 5536 static_branch_dec(&bpf_master_redirect_enabled_key); 5537 } 5538 5539 return 0; 5540 5541 err: 5542 /* unwind the program changes */ 5543 bond->xdp_prog = old_prog; 5544 xdp.prog = old_prog; 5545 xdp.extack = NULL; /* do not overwrite original error */ 5546 5547 bond_for_each_slave(bond, rollback_slave, iter) { 5548 struct net_device *slave_dev = rollback_slave->dev; 5549 int err_unwind; 5550 5551 if (slave == rollback_slave) 5552 break; 5553 5554 err_unwind = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 5555 if (err_unwind < 0) 5556 slave_err(dev, slave_dev, 5557 "Error %d when unwinding XDP program change\n", err_unwind); 5558 else if (xdp.prog) 5559 bpf_prog_inc(xdp.prog); 5560 } 5561 return err; 5562 } 5563 5564 static int bond_xdp(struct net_device *dev, struct netdev_bpf *xdp) 5565 { 5566 switch (xdp->command) { 5567 case XDP_SETUP_PROG: 5568 return bond_xdp_set(dev, xdp->prog, xdp->extack); 5569 default: 5570 return -EINVAL; 5571 } 5572 } 5573 5574 static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed) 5575 { 5576 if (speed == 0 || speed == SPEED_UNKNOWN) 5577 speed = slave->speed; 5578 else 5579 speed = min(speed, slave->speed); 5580 5581 return speed; 5582 } 5583 5584 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev, 5585 struct ethtool_link_ksettings *cmd) 5586 { 5587 struct bonding *bond = netdev_priv(bond_dev); 5588 struct list_head *iter; 5589 struct slave *slave; 5590 u32 speed = 0; 5591 5592 cmd->base.duplex = DUPLEX_UNKNOWN; 5593 cmd->base.port = PORT_OTHER; 5594 5595 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we 5596 * do not need to check mode. Though link speed might not represent 5597 * the true receive or transmit bandwidth (not all modes are symmetric) 5598 * this is an accurate maximum. 5599 */ 5600 bond_for_each_slave(bond, slave, iter) { 5601 if (bond_slave_can_tx(slave)) { 5602 if (slave->speed != SPEED_UNKNOWN) { 5603 if (BOND_MODE(bond) == BOND_MODE_BROADCAST) 5604 speed = bond_mode_bcast_speed(slave, 5605 speed); 5606 else 5607 speed += slave->speed; 5608 } 5609 if (cmd->base.duplex == DUPLEX_UNKNOWN && 5610 slave->duplex != DUPLEX_UNKNOWN) 5611 cmd->base.duplex = slave->duplex; 5612 } 5613 } 5614 cmd->base.speed = speed ? : SPEED_UNKNOWN; 5615 5616 return 0; 5617 } 5618 5619 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 5620 struct ethtool_drvinfo *drvinfo) 5621 { 5622 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver)); 5623 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d", 5624 BOND_ABI_VERSION); 5625 } 5626 5627 static int bond_ethtool_get_ts_info(struct net_device *bond_dev, 5628 struct ethtool_ts_info *info) 5629 { 5630 struct bonding *bond = netdev_priv(bond_dev); 5631 const struct ethtool_ops *ops; 5632 struct net_device *real_dev; 5633 struct phy_device *phydev; 5634 int ret = 0; 5635 5636 rcu_read_lock(); 5637 real_dev = bond_option_active_slave_get_rcu(bond); 5638 dev_hold(real_dev); 5639 rcu_read_unlock(); 5640 5641 if (real_dev) { 5642 ops = real_dev->ethtool_ops; 5643 phydev = real_dev->phydev; 5644 5645 if (phy_has_tsinfo(phydev)) { 5646 ret = phy_ts_info(phydev, info); 5647 goto out; 5648 } else if (ops->get_ts_info) { 5649 ret = ops->get_ts_info(real_dev, info); 5650 goto out; 5651 } 5652 } 5653 5654 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE | 5655 SOF_TIMESTAMPING_SOFTWARE; 5656 info->phc_index = -1; 5657 5658 out: 5659 dev_put(real_dev); 5660 return ret; 5661 } 5662 5663 static const struct ethtool_ops bond_ethtool_ops = { 5664 .get_drvinfo = bond_ethtool_get_drvinfo, 5665 .get_link = ethtool_op_get_link, 5666 .get_link_ksettings = bond_ethtool_get_link_ksettings, 5667 .get_ts_info = bond_ethtool_get_ts_info, 5668 }; 5669 5670 static const struct net_device_ops bond_netdev_ops = { 5671 .ndo_init = bond_init, 5672 .ndo_uninit = bond_uninit, 5673 .ndo_open = bond_open, 5674 .ndo_stop = bond_close, 5675 .ndo_start_xmit = bond_start_xmit, 5676 .ndo_select_queue = bond_select_queue, 5677 .ndo_get_stats64 = bond_get_stats, 5678 .ndo_eth_ioctl = bond_eth_ioctl, 5679 .ndo_siocbond = bond_do_ioctl, 5680 .ndo_siocdevprivate = bond_siocdevprivate, 5681 .ndo_change_rx_flags = bond_change_rx_flags, 5682 .ndo_set_rx_mode = bond_set_rx_mode, 5683 .ndo_change_mtu = bond_change_mtu, 5684 .ndo_set_mac_address = bond_set_mac_address, 5685 .ndo_neigh_setup = bond_neigh_setup, 5686 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 5687 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 5688 #ifdef CONFIG_NET_POLL_CONTROLLER 5689 .ndo_netpoll_setup = bond_netpoll_setup, 5690 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 5691 .ndo_poll_controller = bond_poll_controller, 5692 #endif 5693 .ndo_add_slave = bond_enslave, 5694 .ndo_del_slave = bond_release, 5695 .ndo_fix_features = bond_fix_features, 5696 .ndo_features_check = passthru_features_check, 5697 .ndo_get_xmit_slave = bond_xmit_get_slave, 5698 .ndo_sk_get_lower_dev = bond_sk_get_lower_dev, 5699 .ndo_bpf = bond_xdp, 5700 .ndo_xdp_xmit = bond_xdp_xmit, 5701 .ndo_xdp_get_xmit_slave = bond_xdp_get_xmit_slave, 5702 }; 5703 5704 static const struct device_type bond_type = { 5705 .name = "bond", 5706 }; 5707 5708 static void bond_destructor(struct net_device *bond_dev) 5709 { 5710 struct bonding *bond = netdev_priv(bond_dev); 5711 5712 if (bond->wq) 5713 destroy_workqueue(bond->wq); 5714 5715 if (bond->rr_tx_counter) 5716 free_percpu(bond->rr_tx_counter); 5717 } 5718 5719 void bond_setup(struct net_device *bond_dev) 5720 { 5721 struct bonding *bond = netdev_priv(bond_dev); 5722 5723 spin_lock_init(&bond->mode_lock); 5724 bond->params = bonding_defaults; 5725 5726 /* Initialize pointers */ 5727 bond->dev = bond_dev; 5728 5729 /* Initialize the device entry points */ 5730 ether_setup(bond_dev); 5731 bond_dev->max_mtu = ETH_MAX_MTU; 5732 bond_dev->netdev_ops = &bond_netdev_ops; 5733 bond_dev->ethtool_ops = &bond_ethtool_ops; 5734 5735 bond_dev->needs_free_netdev = true; 5736 bond_dev->priv_destructor = bond_destructor; 5737 5738 SET_NETDEV_DEVTYPE(bond_dev, &bond_type); 5739 5740 /* Initialize the device options */ 5741 bond_dev->flags |= IFF_MASTER; 5742 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE; 5743 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 5744 5745 #ifdef CONFIG_XFRM_OFFLOAD 5746 /* set up xfrm device ops (only supported in active-backup right now) */ 5747 bond_dev->xfrmdev_ops = &bond_xfrmdev_ops; 5748 INIT_LIST_HEAD(&bond->ipsec_list); 5749 spin_lock_init(&bond->ipsec_lock); 5750 #endif /* CONFIG_XFRM_OFFLOAD */ 5751 5752 /* don't acquire bond device's netif_tx_lock when transmitting */ 5753 bond_dev->features |= NETIF_F_LLTX; 5754 5755 /* By default, we declare the bond to be fully 5756 * VLAN hardware accelerated capable. Special 5757 * care is taken in the various xmit functions 5758 * when there are slaves that are not hw accel 5759 * capable 5760 */ 5761 5762 /* Don't allow bond devices to change network namespaces. */ 5763 bond_dev->features |= NETIF_F_NETNS_LOCAL; 5764 5765 bond_dev->hw_features = BOND_VLAN_FEATURES | 5766 NETIF_F_HW_VLAN_CTAG_RX | 5767 NETIF_F_HW_VLAN_CTAG_FILTER; 5768 5769 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL; 5770 bond_dev->features |= bond_dev->hw_features; 5771 bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; 5772 #ifdef CONFIG_XFRM_OFFLOAD 5773 bond_dev->hw_features |= BOND_XFRM_FEATURES; 5774 /* Only enable XFRM features if this is an active-backup config */ 5775 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 5776 bond_dev->features |= BOND_XFRM_FEATURES; 5777 #endif /* CONFIG_XFRM_OFFLOAD */ 5778 #if IS_ENABLED(CONFIG_TLS_DEVICE) 5779 if (bond_sk_check(bond)) 5780 bond_dev->features |= BOND_TLS_FEATURES; 5781 #endif 5782 } 5783 5784 /* Destroy a bonding device. 5785 * Must be under rtnl_lock when this function is called. 5786 */ 5787 static void bond_uninit(struct net_device *bond_dev) 5788 { 5789 struct bonding *bond = netdev_priv(bond_dev); 5790 struct bond_up_slave *usable, *all; 5791 struct list_head *iter; 5792 struct slave *slave; 5793 5794 bond_netpoll_cleanup(bond_dev); 5795 5796 /* Release the bonded slaves */ 5797 bond_for_each_slave(bond, slave, iter) 5798 __bond_release_one(bond_dev, slave->dev, true, true); 5799 netdev_info(bond_dev, "Released all slaves\n"); 5800 5801 usable = rtnl_dereference(bond->usable_slaves); 5802 if (usable) { 5803 RCU_INIT_POINTER(bond->usable_slaves, NULL); 5804 kfree_rcu(usable, rcu); 5805 } 5806 5807 all = rtnl_dereference(bond->all_slaves); 5808 if (all) { 5809 RCU_INIT_POINTER(bond->all_slaves, NULL); 5810 kfree_rcu(all, rcu); 5811 } 5812 5813 list_del(&bond->bond_list); 5814 5815 bond_debug_unregister(bond); 5816 } 5817 5818 /*------------------------- Module initialization ---------------------------*/ 5819 5820 static int bond_check_params(struct bond_params *params) 5821 { 5822 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i; 5823 struct bond_opt_value newval; 5824 const struct bond_opt_value *valptr; 5825 int arp_all_targets_value = 0; 5826 u16 ad_actor_sys_prio = 0; 5827 u16 ad_user_port_key = 0; 5828 __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 }; 5829 int arp_ip_count; 5830 int bond_mode = BOND_MODE_ROUNDROBIN; 5831 int xmit_hashtype = BOND_XMIT_POLICY_LAYER2; 5832 int lacp_fast = 0; 5833 int tlb_dynamic_lb; 5834 5835 /* Convert string parameters. */ 5836 if (mode) { 5837 bond_opt_initstr(&newval, mode); 5838 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval); 5839 if (!valptr) { 5840 pr_err("Error: Invalid bonding mode \"%s\"\n", mode); 5841 return -EINVAL; 5842 } 5843 bond_mode = valptr->value; 5844 } 5845 5846 if (xmit_hash_policy) { 5847 if (bond_mode == BOND_MODE_ROUNDROBIN || 5848 bond_mode == BOND_MODE_ACTIVEBACKUP || 5849 bond_mode == BOND_MODE_BROADCAST) { 5850 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 5851 bond_mode_name(bond_mode)); 5852 } else { 5853 bond_opt_initstr(&newval, xmit_hash_policy); 5854 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH), 5855 &newval); 5856 if (!valptr) { 5857 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 5858 xmit_hash_policy); 5859 return -EINVAL; 5860 } 5861 xmit_hashtype = valptr->value; 5862 } 5863 } 5864 5865 if (lacp_rate) { 5866 if (bond_mode != BOND_MODE_8023AD) { 5867 pr_info("lacp_rate param is irrelevant in mode %s\n", 5868 bond_mode_name(bond_mode)); 5869 } else { 5870 bond_opt_initstr(&newval, lacp_rate); 5871 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE), 5872 &newval); 5873 if (!valptr) { 5874 pr_err("Error: Invalid lacp rate \"%s\"\n", 5875 lacp_rate); 5876 return -EINVAL; 5877 } 5878 lacp_fast = valptr->value; 5879 } 5880 } 5881 5882 if (ad_select) { 5883 bond_opt_initstr(&newval, ad_select); 5884 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT), 5885 &newval); 5886 if (!valptr) { 5887 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select); 5888 return -EINVAL; 5889 } 5890 params->ad_select = valptr->value; 5891 if (bond_mode != BOND_MODE_8023AD) 5892 pr_warn("ad_select param only affects 802.3ad mode\n"); 5893 } else { 5894 params->ad_select = BOND_AD_STABLE; 5895 } 5896 5897 if (max_bonds < 0) { 5898 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 5899 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 5900 max_bonds = BOND_DEFAULT_MAX_BONDS; 5901 } 5902 5903 if (miimon < 0) { 5904 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n", 5905 miimon, INT_MAX); 5906 miimon = 0; 5907 } 5908 5909 if (updelay < 0) { 5910 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 5911 updelay, INT_MAX); 5912 updelay = 0; 5913 } 5914 5915 if (downdelay < 0) { 5916 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 5917 downdelay, INT_MAX); 5918 downdelay = 0; 5919 } 5920 5921 if ((use_carrier != 0) && (use_carrier != 1)) { 5922 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 5923 use_carrier); 5924 use_carrier = 1; 5925 } 5926 5927 if (num_peer_notif < 0 || num_peer_notif > 255) { 5928 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 5929 num_peer_notif); 5930 num_peer_notif = 1; 5931 } 5932 5933 /* reset values for 802.3ad/TLB/ALB */ 5934 if (!bond_mode_uses_arp(bond_mode)) { 5935 if (!miimon) { 5936 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"); 5937 pr_warn("Forcing miimon to 100msec\n"); 5938 miimon = BOND_DEFAULT_MIIMON; 5939 } 5940 } 5941 5942 if (tx_queues < 1 || tx_queues > 255) { 5943 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n", 5944 tx_queues, BOND_DEFAULT_TX_QUEUES); 5945 tx_queues = BOND_DEFAULT_TX_QUEUES; 5946 } 5947 5948 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 5949 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n", 5950 all_slaves_active); 5951 all_slaves_active = 0; 5952 } 5953 5954 if (resend_igmp < 0 || resend_igmp > 255) { 5955 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n", 5956 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 5957 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 5958 } 5959 5960 bond_opt_initval(&newval, packets_per_slave); 5961 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) { 5962 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n", 5963 packets_per_slave, USHRT_MAX); 5964 packets_per_slave = 1; 5965 } 5966 5967 if (bond_mode == BOND_MODE_ALB) { 5968 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", 5969 updelay); 5970 } 5971 5972 if (!miimon) { 5973 if (updelay || downdelay) { 5974 /* just warn the user the up/down delay will have 5975 * no effect since miimon is zero... 5976 */ 5977 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", 5978 updelay, downdelay); 5979 } 5980 } else { 5981 /* don't allow arp monitoring */ 5982 if (arp_interval) { 5983 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 5984 miimon, arp_interval); 5985 arp_interval = 0; 5986 } 5987 5988 if ((updelay % miimon) != 0) { 5989 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 5990 updelay, miimon, (updelay / miimon) * miimon); 5991 } 5992 5993 updelay /= miimon; 5994 5995 if ((downdelay % miimon) != 0) { 5996 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 5997 downdelay, miimon, 5998 (downdelay / miimon) * miimon); 5999 } 6000 6001 downdelay /= miimon; 6002 } 6003 6004 if (arp_interval < 0) { 6005 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n", 6006 arp_interval, INT_MAX); 6007 arp_interval = 0; 6008 } 6009 6010 for (arp_ip_count = 0, i = 0; 6011 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) { 6012 __be32 ip; 6013 6014 /* not a complete check, but good enough to catch mistakes */ 6015 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) || 6016 !bond_is_ip_target_ok(ip)) { 6017 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 6018 arp_ip_target[i]); 6019 arp_interval = 0; 6020 } else { 6021 if (bond_get_targets_ip(arp_target, ip) == -1) 6022 arp_target[arp_ip_count++] = ip; 6023 else 6024 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n", 6025 &ip); 6026 } 6027 } 6028 6029 if (arp_interval && !arp_ip_count) { 6030 /* don't allow arping if no arp_ip_target given... */ 6031 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 6032 arp_interval); 6033 arp_interval = 0; 6034 } 6035 6036 if (arp_validate) { 6037 if (!arp_interval) { 6038 pr_err("arp_validate requires arp_interval\n"); 6039 return -EINVAL; 6040 } 6041 6042 bond_opt_initstr(&newval, arp_validate); 6043 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE), 6044 &newval); 6045 if (!valptr) { 6046 pr_err("Error: invalid arp_validate \"%s\"\n", 6047 arp_validate); 6048 return -EINVAL; 6049 } 6050 arp_validate_value = valptr->value; 6051 } else { 6052 arp_validate_value = 0; 6053 } 6054 6055 if (arp_all_targets) { 6056 bond_opt_initstr(&newval, arp_all_targets); 6057 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS), 6058 &newval); 6059 if (!valptr) { 6060 pr_err("Error: invalid arp_all_targets_value \"%s\"\n", 6061 arp_all_targets); 6062 arp_all_targets_value = 0; 6063 } else { 6064 arp_all_targets_value = valptr->value; 6065 } 6066 } 6067 6068 if (miimon) { 6069 pr_info("MII link monitoring set to %d ms\n", miimon); 6070 } else if (arp_interval) { 6071 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE, 6072 arp_validate_value); 6073 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 6074 arp_interval, valptr->string, arp_ip_count); 6075 6076 for (i = 0; i < arp_ip_count; i++) 6077 pr_cont(" %s", arp_ip_target[i]); 6078 6079 pr_cont("\n"); 6080 6081 } else if (max_bonds) { 6082 /* miimon and arp_interval not set, we need one so things 6083 * work as expected, see bonding.txt for details 6084 */ 6085 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"); 6086 } 6087 6088 if (primary && !bond_mode_uses_primary(bond_mode)) { 6089 /* currently, using a primary only makes sense 6090 * in active backup, TLB or ALB modes 6091 */ 6092 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n", 6093 primary, bond_mode_name(bond_mode)); 6094 primary = NULL; 6095 } 6096 6097 if (primary && primary_reselect) { 6098 bond_opt_initstr(&newval, primary_reselect); 6099 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT), 6100 &newval); 6101 if (!valptr) { 6102 pr_err("Error: Invalid primary_reselect \"%s\"\n", 6103 primary_reselect); 6104 return -EINVAL; 6105 } 6106 primary_reselect_value = valptr->value; 6107 } else { 6108 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 6109 } 6110 6111 if (fail_over_mac) { 6112 bond_opt_initstr(&newval, fail_over_mac); 6113 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC), 6114 &newval); 6115 if (!valptr) { 6116 pr_err("Error: invalid fail_over_mac \"%s\"\n", 6117 fail_over_mac); 6118 return -EINVAL; 6119 } 6120 fail_over_mac_value = valptr->value; 6121 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 6122 pr_warn("Warning: fail_over_mac only affects active-backup mode\n"); 6123 } else { 6124 fail_over_mac_value = BOND_FOM_NONE; 6125 } 6126 6127 bond_opt_initstr(&newval, "default"); 6128 valptr = bond_opt_parse( 6129 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO), 6130 &newval); 6131 if (!valptr) { 6132 pr_err("Error: No ad_actor_sys_prio default value"); 6133 return -EINVAL; 6134 } 6135 ad_actor_sys_prio = valptr->value; 6136 6137 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY), 6138 &newval); 6139 if (!valptr) { 6140 pr_err("Error: No ad_user_port_key default value"); 6141 return -EINVAL; 6142 } 6143 ad_user_port_key = valptr->value; 6144 6145 bond_opt_initstr(&newval, "default"); 6146 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval); 6147 if (!valptr) { 6148 pr_err("Error: No tlb_dynamic_lb default value"); 6149 return -EINVAL; 6150 } 6151 tlb_dynamic_lb = valptr->value; 6152 6153 if (lp_interval == 0) { 6154 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n", 6155 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL); 6156 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 6157 } 6158 6159 /* fill params struct with the proper values */ 6160 params->mode = bond_mode; 6161 params->xmit_policy = xmit_hashtype; 6162 params->miimon = miimon; 6163 params->num_peer_notif = num_peer_notif; 6164 params->arp_interval = arp_interval; 6165 params->arp_validate = arp_validate_value; 6166 params->arp_all_targets = arp_all_targets_value; 6167 params->missed_max = 2; 6168 params->updelay = updelay; 6169 params->downdelay = downdelay; 6170 params->peer_notif_delay = 0; 6171 params->use_carrier = use_carrier; 6172 params->lacp_active = 1; 6173 params->lacp_fast = lacp_fast; 6174 params->primary[0] = 0; 6175 params->primary_reselect = primary_reselect_value; 6176 params->fail_over_mac = fail_over_mac_value; 6177 params->tx_queues = tx_queues; 6178 params->all_slaves_active = all_slaves_active; 6179 params->resend_igmp = resend_igmp; 6180 params->min_links = min_links; 6181 params->lp_interval = lp_interval; 6182 params->packets_per_slave = packets_per_slave; 6183 params->tlb_dynamic_lb = tlb_dynamic_lb; 6184 params->ad_actor_sys_prio = ad_actor_sys_prio; 6185 eth_zero_addr(params->ad_actor_system); 6186 params->ad_user_port_key = ad_user_port_key; 6187 if (packets_per_slave > 0) { 6188 params->reciprocal_packets_per_slave = 6189 reciprocal_value(packets_per_slave); 6190 } else { 6191 /* reciprocal_packets_per_slave is unused if 6192 * packets_per_slave is 0 or 1, just initialize it 6193 */ 6194 params->reciprocal_packets_per_slave = 6195 (struct reciprocal_value) { 0 }; 6196 } 6197 6198 if (primary) 6199 strscpy_pad(params->primary, primary, sizeof(params->primary)); 6200 6201 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 6202 #if IS_ENABLED(CONFIG_IPV6) 6203 memset(params->ns_targets, 0, sizeof(struct in6_addr) * BOND_MAX_NS_TARGETS); 6204 #endif 6205 6206 return 0; 6207 } 6208 6209 /* Called from registration process */ 6210 static int bond_init(struct net_device *bond_dev) 6211 { 6212 struct bonding *bond = netdev_priv(bond_dev); 6213 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 6214 6215 netdev_dbg(bond_dev, "Begin bond_init\n"); 6216 6217 bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM); 6218 if (!bond->wq) 6219 return -ENOMEM; 6220 6221 if (BOND_MODE(bond) == BOND_MODE_ROUNDROBIN) { 6222 bond->rr_tx_counter = alloc_percpu(u32); 6223 if (!bond->rr_tx_counter) { 6224 destroy_workqueue(bond->wq); 6225 bond->wq = NULL; 6226 return -ENOMEM; 6227 } 6228 } 6229 6230 spin_lock_init(&bond->stats_lock); 6231 netdev_lockdep_set_classes(bond_dev); 6232 6233 list_add_tail(&bond->bond_list, &bn->dev_list); 6234 6235 bond_prepare_sysfs_group(bond); 6236 6237 bond_debug_register(bond); 6238 6239 /* Ensure valid dev_addr */ 6240 if (is_zero_ether_addr(bond_dev->dev_addr) && 6241 bond_dev->addr_assign_type == NET_ADDR_PERM) 6242 eth_hw_addr_random(bond_dev); 6243 6244 return 0; 6245 } 6246 6247 unsigned int bond_get_num_tx_queues(void) 6248 { 6249 return tx_queues; 6250 } 6251 6252 /* Create a new bond based on the specified name and bonding parameters. 6253 * If name is NULL, obtain a suitable "bond%d" name for us. 6254 * Caller must NOT hold rtnl_lock; we need to release it here before we 6255 * set up our sysfs entries. 6256 */ 6257 int bond_create(struct net *net, const char *name) 6258 { 6259 struct net_device *bond_dev; 6260 struct bonding *bond; 6261 int res = -ENOMEM; 6262 6263 rtnl_lock(); 6264 6265 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 6266 name ? name : "bond%d", NET_NAME_UNKNOWN, 6267 bond_setup, tx_queues); 6268 if (!bond_dev) 6269 goto out; 6270 6271 bond = netdev_priv(bond_dev); 6272 dev_net_set(bond_dev, net); 6273 bond_dev->rtnl_link_ops = &bond_link_ops; 6274 6275 res = register_netdevice(bond_dev); 6276 if (res < 0) { 6277 free_netdev(bond_dev); 6278 goto out; 6279 } 6280 6281 netif_carrier_off(bond_dev); 6282 6283 bond_work_init_all(bond); 6284 6285 out: 6286 rtnl_unlock(); 6287 return res; 6288 } 6289 6290 static int __net_init bond_net_init(struct net *net) 6291 { 6292 struct bond_net *bn = net_generic(net, bond_net_id); 6293 6294 bn->net = net; 6295 INIT_LIST_HEAD(&bn->dev_list); 6296 6297 bond_create_proc_dir(bn); 6298 bond_create_sysfs(bn); 6299 6300 return 0; 6301 } 6302 6303 static void __net_exit bond_net_exit_batch(struct list_head *net_list) 6304 { 6305 struct bond_net *bn; 6306 struct net *net; 6307 LIST_HEAD(list); 6308 6309 list_for_each_entry(net, net_list, exit_list) { 6310 bn = net_generic(net, bond_net_id); 6311 bond_destroy_sysfs(bn); 6312 } 6313 6314 /* Kill off any bonds created after unregistering bond rtnl ops */ 6315 rtnl_lock(); 6316 list_for_each_entry(net, net_list, exit_list) { 6317 struct bonding *bond, *tmp_bond; 6318 6319 bn = net_generic(net, bond_net_id); 6320 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list) 6321 unregister_netdevice_queue(bond->dev, &list); 6322 } 6323 unregister_netdevice_many(&list); 6324 rtnl_unlock(); 6325 6326 list_for_each_entry(net, net_list, exit_list) { 6327 bn = net_generic(net, bond_net_id); 6328 bond_destroy_proc_dir(bn); 6329 } 6330 } 6331 6332 static struct pernet_operations bond_net_ops = { 6333 .init = bond_net_init, 6334 .exit_batch = bond_net_exit_batch, 6335 .id = &bond_net_id, 6336 .size = sizeof(struct bond_net), 6337 }; 6338 6339 static int __init bonding_init(void) 6340 { 6341 int i; 6342 int res; 6343 6344 res = bond_check_params(&bonding_defaults); 6345 if (res) 6346 goto out; 6347 6348 res = register_pernet_subsys(&bond_net_ops); 6349 if (res) 6350 goto out; 6351 6352 res = bond_netlink_init(); 6353 if (res) 6354 goto err_link; 6355 6356 bond_create_debugfs(); 6357 6358 for (i = 0; i < max_bonds; i++) { 6359 res = bond_create(&init_net, NULL); 6360 if (res) 6361 goto err; 6362 } 6363 6364 skb_flow_dissector_init(&flow_keys_bonding, 6365 flow_keys_bonding_keys, 6366 ARRAY_SIZE(flow_keys_bonding_keys)); 6367 6368 register_netdevice_notifier(&bond_netdev_notifier); 6369 out: 6370 return res; 6371 err: 6372 bond_destroy_debugfs(); 6373 bond_netlink_fini(); 6374 err_link: 6375 unregister_pernet_subsys(&bond_net_ops); 6376 goto out; 6377 6378 } 6379 6380 static void __exit bonding_exit(void) 6381 { 6382 unregister_netdevice_notifier(&bond_netdev_notifier); 6383 6384 bond_destroy_debugfs(); 6385 6386 bond_netlink_fini(); 6387 unregister_pernet_subsys(&bond_net_ops); 6388 6389 #ifdef CONFIG_NET_POLL_CONTROLLER 6390 /* Make sure we don't have an imbalance on our netpoll blocking */ 6391 WARN_ON(atomic_read(&netpoll_block_tx)); 6392 #endif 6393 } 6394 6395 module_init(bonding_init); 6396 module_exit(bonding_exit); 6397 MODULE_LICENSE("GPL"); 6398 MODULE_DESCRIPTION(DRV_DESCRIPTION); 6399 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 6400